Adding upstream version 6.8.0.upstream/6.8.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

14 files changed, 10484 insertions, 0 deletions

diff --git a/misc/.gitignore b/misc/.gitignore
new file mode 100644
index 0000000..d7df0b0
--- /dev/null
+++ b/misc/.gitignore
@@ -0,0 +1,7 @@
+arpd
+ifstat
+ss
+ssfilter.tab.c
+nstat
+lnstat
+rtacct
diff --git a/misc/Makefile b/misc/Makefile
new file mode 100644
index 0000000..50dae79
--- /dev/null
+++ b/misc/Makefile
@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: GPL-2.0
+SSOBJ=ss.o ssfilter_check.o ssfilter.tab.o
+LNSTATOBJ=lnstat.o lnstat_util.o
+
+TARGETS=ss nstat ifstat rtacct lnstat
+
+include ../config.mk
+
+ifeq ($(HAVE_BERKELEY_DB),y)
+	TARGETS += arpd
+endif
+
+all: $(TARGETS)
+
+ss: $(SSOBJ)
+	$(QUIET_LINK)$(CC) $^ $(LDFLAGS) $(LDLIBS) -o $@
+
+nstat: nstat.c
+	$(QUIET_CC)$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o nstat nstat.c $(LDLIBS) -lm
+
+ifstat: ifstat.c
+	$(QUIET_CC)$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o ifstat ifstat.c $(LDLIBS) -lm
+
+rtacct: rtacct.c
+	$(QUIET_CC)$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o rtacct rtacct.c $(LDLIBS) -lm
+
+arpd: arpd.c
+	$(QUIET_CC)$(CC) $(CFLAGS) -I$(DBM_INCLUDE) $(CPPFLAGS) $(LDFLAGS) -o arpd arpd.c $(LDLIBS) -ldb
+
+ssfilter.tab.c: ssfilter.y
+	$(QUIET_YACC)$(YACC) -b ssfilter ssfilter.y
+
+lnstat: $(LNSTATOBJ)
+	$(QUIET_LINK)$(CC) $^ $(LDFLAGS) $(LDLIBS) -o $@
+
+install: all
+	install -m 0755 $(TARGETS) $(DESTDIR)$(SBINDIR)
+	ln -sf lnstat $(DESTDIR)$(SBINDIR)/rtstat
+	ln -sf lnstat $(DESTDIR)$(SBINDIR)/ctstat
+
+clean:
+	rm -f *.o $(TARGETS) ssfilter.c
diff --git a/misc/arpd.c b/misc/arpd.c
new file mode 100644
index 0000000..1ef837c
--- /dev/null
+++ b/misc/arpd.c
@@ -0,0 +1,833 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * arpd.c	ARP helper daemon.
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ */
+
+#include <stdio.h>
+#include <syslog.h>
+#include <malloc.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <netdb.h>
+#include <db_185.h>
+#include <sys/ioctl.h>
+#include <sys/poll.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/uio.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <time.h>
+#include <signal.h>
+#include <linux/if.h>
+#include <linux/if_ether.h>
+#include <linux/if_arp.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <linux/if_packet.h>
+#include <linux/filter.h>
+
+#include "libnetlink.h"
+#include "utils.h"
+#include "rt_names.h"
+
+DB	*dbase;
+char	*dbname = "/var/lib/arpd/arpd.db";
+
+int	ifnum;
+int	*ifvec;
+char	**ifnames;
+
+struct dbkey {
+	__u32	iface;
+	__u32	addr;
+};
+
+#define IS_NEG(x)	(((__u8 *)(x))[0] == 0xFF)
+#define NEG_TIME(x)	(((x)[2]<<24)|((x)[3]<<16)|((x)[4]<<8)|(x)[5])
+#define NEG_AGE(x)	((__u32)time(NULL) - NEG_TIME((__u8 *)x))
+#define NEG_VALID(x)	(NEG_AGE(x) < negative_timeout)
+#define NEG_CNT(x)	(((__u8 *)(x))[1])
+
+struct rtnl_handle rth;
+
+struct pollfd pset[2];
+int udp_sock = -1;
+
+volatile int do_exit;
+volatile int do_sync;
+volatile int do_stats;
+
+struct {
+	unsigned long arp_new;
+	unsigned long arp_change;
+
+	unsigned long app_recv;
+	unsigned long app_success;
+	unsigned long app_bad;
+	unsigned long app_neg;
+	unsigned long app_suppressed;
+
+	unsigned long kern_neg;
+	unsigned long kern_new;
+	unsigned long kern_change;
+
+	unsigned long probes_sent;
+	unsigned long probes_suppressed;
+} stats;
+
+int active_probing;
+int negative_timeout = 60;
+int no_kernel_broadcasts;
+int broadcast_rate = 1000;
+int broadcast_burst = 3000;
+int poll_timeout = 30000;
+
+static void usage(void)
+{
+	fprintf(stderr,
+		"Usage: arpd [ -lkh? ] [ -a N ] [ -b dbase ] [ -B number ] [ -f file ] [ -n time ] [-p interval ] [ -R rate ] [ interfaces ]\n");
+	exit(1);
+}
+
+static int handle_if(int ifindex)
+{
+	int i;
+
+	if (ifnum == 0)
+		return 1;
+
+	for (i = 0; i < ifnum; i++)
+		if (ifvec[i] == ifindex)
+			return 1;
+	return 0;
+}
+
+int sysctl_adjusted;
+
+static void do_sysctl_adjustments(void)
+{
+	int i;
+
+	if (!ifnum)
+		return;
+
+	for (i = 0; i < ifnum; i++) {
+		char buf[128];
+		FILE *fp;
+
+		if (active_probing) {
+			sprintf(buf, "/proc/sys/net/ipv4/neigh/%s/mcast_solicit", ifnames[i]);
+			if ((fp = fopen(buf, "w")) != NULL) {
+				if (no_kernel_broadcasts)
+					strcpy(buf, "0\n");
+				else
+					sprintf(buf, "%d\n", active_probing >= 2 ? 1 : 3-active_probing);
+				fputs(buf, fp);
+				fclose(fp);
+			}
+		}
+
+		sprintf(buf, "/proc/sys/net/ipv4/neigh/%s/app_solicit", ifnames[i]);
+		if ((fp = fopen(buf, "w")) != NULL) {
+			sprintf(buf, "%d\n", active_probing <= 1 ? 1 : active_probing);
+			fputs(buf, fp);
+			fclose(fp);
+		}
+	}
+	sysctl_adjusted = 1;
+}
+
+static void undo_sysctl_adjustments(void)
+{
+	int i;
+
+	if (!sysctl_adjusted)
+		return;
+
+	for (i = 0; i < ifnum; i++) {
+		char buf[128];
+		FILE *fp;
+
+		if (active_probing) {
+			sprintf(buf, "/proc/sys/net/ipv4/neigh/%s/mcast_solicit", ifnames[i]);
+			if ((fp = fopen(buf, "w")) != NULL) {
+				strcpy(buf, "3\n");
+				fputs(buf, fp);
+				fclose(fp);
+			}
+		}
+		sprintf(buf, "/proc/sys/net/ipv4/neigh/%s/app_solicit", ifnames[i]);
+		if ((fp = fopen(buf, "w")) != NULL) {
+			strcpy(buf, "0\n");
+			fputs(buf, fp);
+			fclose(fp);
+		}
+	}
+	sysctl_adjusted = 0;
+}
+
+
+static int send_probe(int ifindex, __u32 addr)
+{
+	struct ifreq ifr = { .ifr_ifindex = ifindex };
+	struct sockaddr_in dst = {
+		.sin_family = AF_INET,
+		.sin_port = htons(1025),
+		.sin_addr.s_addr = addr,
+	};
+	socklen_t len;
+	unsigned char buf[256];
+	struct arphdr *ah = (struct arphdr *)buf;
+	unsigned char *p = (unsigned char *)(ah+1);
+	struct sockaddr_ll sll = {
+		.sll_family = AF_PACKET,
+		.sll_ifindex = ifindex,
+		.sll_protocol = htons(ETH_P_ARP),
+	};
+
+	if (ioctl(udp_sock, SIOCGIFNAME, &ifr))
+		return -1;
+	if (ioctl(udp_sock, SIOCGIFHWADDR, &ifr))
+		return -1;
+	if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER)
+		return -1;
+	if (setsockopt(udp_sock, SOL_SOCKET, SO_BINDTODEVICE, ifr.ifr_name, strlen(ifr.ifr_name)+1) < 0)
+		return -1;
+
+	if (connect(udp_sock, (struct sockaddr *)&dst, sizeof(dst)) < 0)
+		return -1;
+	len = sizeof(dst);
+	if (getsockname(udp_sock, (struct sockaddr *)&dst, &len) < 0)
+		return -1;
+
+	ah->ar_hrd = htons(ifr.ifr_hwaddr.sa_family);
+	ah->ar_pro = htons(ETH_P_IP);
+	ah->ar_hln = 6;
+	ah->ar_pln = 4;
+	ah->ar_op  = htons(ARPOP_REQUEST);
+
+	memcpy(p, ifr.ifr_hwaddr.sa_data, ah->ar_hln);
+	p += ah->ar_hln;
+
+	memcpy(p, &dst.sin_addr, 4);
+	p += 4;
+
+	memset(sll.sll_addr, 0xFF, sizeof(sll.sll_addr));
+	memcpy(p, &sll.sll_addr, ah->ar_hln);
+	p += ah->ar_hln;
+
+	memcpy(p, &addr, 4);
+	p += 4;
+
+	if (sendto(pset[0].fd, buf, p-buf, 0, (struct sockaddr *)&sll, sizeof(sll)) < 0)
+		return -1;
+	stats.probes_sent++;
+	return 0;
+}
+
+/* Be very tough on sending probes: 1 per second with burst of 3. */
+
+static int queue_active_probe(int ifindex, __u32 addr)
+{
+	static struct timeval prev;
+	static int buckets;
+	struct timeval now;
+
+	gettimeofday(&now, NULL);
+	if (prev.tv_sec) {
+		int diff = (now.tv_sec-prev.tv_sec)*1000+(now.tv_usec-prev.tv_usec)/1000;
+
+		buckets += diff;
+	} else {
+		buckets = broadcast_burst;
+	}
+	if (buckets > broadcast_burst)
+		buckets = broadcast_burst;
+	if (buckets >= broadcast_rate && !send_probe(ifindex, addr)) {
+		buckets -= broadcast_rate;
+		prev = now;
+		return 0;
+	}
+	stats.probes_suppressed++;
+	return -1;
+}
+
+static int respond_to_kernel(int ifindex, __u32 addr, char *lla, int llalen)
+{
+	struct {
+		struct nlmsghdr	n;
+		struct ndmsg		ndm;
+		char			buf[256];
+	} req = {
+		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
+		.n.nlmsg_flags = NLM_F_REQUEST,
+		.n.nlmsg_type = RTM_NEWNEIGH,
+		.ndm.ndm_family = AF_INET,
+		.ndm.ndm_state = NUD_STALE,
+		.ndm.ndm_ifindex = ifindex,
+		.ndm.ndm_type = RTN_UNICAST,
+	};
+
+	addattr_l(&req.n, sizeof(req), NDA_DST, &addr, 4);
+	addattr_l(&req.n, sizeof(req), NDA_LLADDR, lla, llalen);
+	return rtnl_send(&rth, &req, req.n.nlmsg_len) <= 0;
+}
+
+static void prepare_neg_entry(__u8 *ndata, __u32 stamp)
+{
+	ndata[0] = 0xFF;
+	ndata[1] = 0;
+	ndata[2] = stamp>>24;
+	ndata[3] = stamp>>16;
+	ndata[4] = stamp>>8;
+	ndata[5] = stamp;
+}
+
+
+static int do_one_request(struct nlmsghdr *n)
+{
+	struct ndmsg *ndm = NLMSG_DATA(n);
+	int len = n->nlmsg_len;
+	struct rtattr *tb[NDA_MAX+1];
+	struct dbkey key;
+	DBT dbkey, dbdat;
+	int do_acct = 0;
+
+	if (n->nlmsg_type == NLMSG_DONE) {
+		dbase->sync(dbase, 0);
+
+		/* Now we have at least mirror of kernel db, so that
+		 * may start real resolution.
+		 */
+		do_sysctl_adjustments();
+		return 0;
+	}
+
+	if (n->nlmsg_type != RTM_GETNEIGH && n->nlmsg_type != RTM_NEWNEIGH)
+		return 0;
+
+	len -= NLMSG_LENGTH(sizeof(*ndm));
+	if (len < 0)
+		return -1;
+
+	if (ndm->ndm_family != AF_INET ||
+	    (ifnum && !handle_if(ndm->ndm_ifindex)) ||
+	    ndm->ndm_flags ||
+	    ndm->ndm_type != RTN_UNICAST ||
+	    !(ndm->ndm_state&~NUD_NOARP))
+		return 0;
+
+	parse_rtattr(tb, NDA_MAX, NDA_RTA(ndm), len);
+
+	if (!tb[NDA_DST])
+		return 0;
+
+	key.iface = ndm->ndm_ifindex;
+	memcpy(&key.addr, RTA_DATA(tb[NDA_DST]), 4);
+	dbkey.data = &key;
+	dbkey.size = sizeof(key);
+
+	if (dbase->get(dbase, &dbkey, &dbdat, 0) != 0) {
+		dbdat.data = 0;
+		dbdat.size = 0;
+	}
+
+	if (n->nlmsg_type == RTM_GETNEIGH) {
+		if (!(n->nlmsg_flags&NLM_F_REQUEST))
+			return 0;
+
+		if (!(ndm->ndm_state&(NUD_PROBE|NUD_INCOMPLETE))) {
+			stats.app_bad++;
+			return 0;
+		}
+
+		if (ndm->ndm_state&NUD_PROBE) {
+			/* If we get this, kernel still has some valid
+			 * address, but unicast probing failed and host
+			 * is either dead or changed its mac address.
+			 * Kernel is going to initiate broadcast resolution.
+			 * OK, we invalidate our information as well.
+			 */
+			if (dbdat.data && !IS_NEG(dbdat.data))
+				stats.app_neg++;
+
+			dbase->del(dbase, &dbkey, 0);
+		} else {
+			/* If we get this kernel does not have any information.
+			 * If we have something tell this to kernel. */
+			stats.app_recv++;
+			if (dbdat.data && !IS_NEG(dbdat.data)) {
+				stats.app_success++;
+				respond_to_kernel(key.iface, key.addr, dbdat.data, dbdat.size);
+				return 0;
+			}
+
+			/* Sheeit! We have nothing to tell. */
+			/* If we have recent negative entry, be silent. */
+			if (dbdat.data && NEG_VALID(dbdat.data)) {
+				if (NEG_CNT(dbdat.data) >= active_probing) {
+					stats.app_suppressed++;
+					return 0;
+				}
+				do_acct = 1;
+			}
+		}
+
+		if (active_probing &&
+		    queue_active_probe(ndm->ndm_ifindex, key.addr) == 0 &&
+		    do_acct) {
+			NEG_CNT(dbdat.data)++;
+			dbase->put(dbase, &dbkey, &dbdat, 0);
+		}
+	} else if (n->nlmsg_type == RTM_NEWNEIGH) {
+		if (n->nlmsg_flags&NLM_F_REQUEST)
+			return 0;
+
+		if (ndm->ndm_state&NUD_FAILED) {
+			/* Kernel was not able to resolve. Host is dead.
+			 * Create negative entry if it is not present
+			 * or renew it if it is too old. */
+			if (!dbdat.data ||
+			    !IS_NEG(dbdat.data) ||
+			    !NEG_VALID(dbdat.data)) {
+				__u8 ndata[6];
+
+				stats.kern_neg++;
+				prepare_neg_entry(ndata, time(NULL));
+				dbdat.data = ndata;
+				dbdat.size = sizeof(ndata);
+				dbase->put(dbase, &dbkey, &dbdat, 0);
+			}
+		} else if (tb[NDA_LLADDR]) {
+			if (dbdat.data && !IS_NEG(dbdat.data)) {
+				if (memcmp(RTA_DATA(tb[NDA_LLADDR]), dbdat.data, dbdat.size) == 0)
+					return 0;
+				stats.kern_change++;
+			} else {
+				stats.kern_new++;
+			}
+			dbdat.data = RTA_DATA(tb[NDA_LLADDR]);
+			dbdat.size = RTA_PAYLOAD(tb[NDA_LLADDR]);
+			dbase->put(dbase, &dbkey, &dbdat, 0);
+		}
+	}
+	return 0;
+}
+
+static void load_initial_table(void)
+{
+	if (rtnl_neighdump_req(&rth, AF_INET, NULL) < 0) {
+		perror("dump request failed");
+		exit(1);
+	}
+
+}
+
+static void get_kern_msg(void)
+{
+	int status;
+	struct nlmsghdr *h;
+	struct sockaddr_nl nladdr = {};
+	struct iovec iov;
+	char   buf[8192];
+	struct msghdr msg = {
+		(void *)&nladdr, sizeof(nladdr),
+		&iov,	1,
+		NULL,	0,
+		0
+	};
+
+	iov.iov_base = buf;
+	iov.iov_len = sizeof(buf);
+
+	status = recvmsg(rth.fd, &msg, MSG_DONTWAIT);
+
+	if (status <= 0)
+		return;
+
+	if (msg.msg_namelen != sizeof(nladdr))
+		return;
+
+	if (nladdr.nl_pid)
+		return;
+
+	for (h = (struct nlmsghdr *)buf; status >= sizeof(*h); ) {
+		int len = h->nlmsg_len;
+		int l = len - sizeof(*h);
+
+		if (l < 0 || len > status)
+			return;
+
+		if (do_one_request(h) < 0)
+			return;
+
+		status -= NLMSG_ALIGN(len);
+		h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len));
+	}
+}
+
+/* Receive gratuitous ARP messages and store them, that's all. */
+static void get_arp_pkt(void)
+{
+	unsigned char buf[1024];
+	struct sockaddr_ll sll;
+	socklen_t sll_len = sizeof(sll);
+	struct arphdr *a = (struct arphdr *)buf;
+	struct dbkey key;
+	DBT dbkey, dbdat;
+	int n;
+
+	n = recvfrom(pset[0].fd, buf, sizeof(buf), MSG_DONTWAIT,
+		     (struct sockaddr *)&sll, &sll_len);
+	if (n < 0) {
+		if (errno != EINTR && errno != EAGAIN)
+			syslog(LOG_ERR, "recvfrom: %m");
+		return;
+	}
+
+	if (ifnum && !handle_if(sll.sll_ifindex))
+		return;
+
+	/* Sanity checks */
+
+	if (n < sizeof(*a) ||
+	    (a->ar_op != htons(ARPOP_REQUEST) &&
+	     a->ar_op != htons(ARPOP_REPLY)) ||
+	    a->ar_pln != 4 ||
+	    a->ar_pro != htons(ETH_P_IP) ||
+	    a->ar_hln != sll.sll_halen ||
+	    sizeof(*a) + 2*4 + 2*a->ar_hln > n)
+		return;
+
+	key.iface = sll.sll_ifindex;
+	memcpy(&key.addr, (char *)(a+1) + a->ar_hln, 4);
+
+	/* DAD message, ignore. */
+	if (key.addr == 0)
+		return;
+
+	dbkey.data = &key;
+	dbkey.size = sizeof(key);
+
+	if (dbase->get(dbase, &dbkey, &dbdat, 0) == 0 && !IS_NEG(dbdat.data)) {
+		if (memcmp(dbdat.data, a+1, dbdat.size) == 0)
+			return;
+		stats.arp_change++;
+	} else {
+		stats.arp_new++;
+	}
+
+	dbdat.data = a+1;
+	dbdat.size = a->ar_hln;
+	dbase->put(dbase, &dbkey, &dbdat, 0);
+}
+
+static void catch_signal(int sig, void (*handler)(int))
+{
+	struct sigaction sa = { .sa_handler = handler };
+
+#ifdef SA_INTERRUPT
+	sa.sa_flags = SA_INTERRUPT;
+#endif
+	sigaction(sig, &sa, NULL);
+}
+
+#include <setjmp.h>
+sigjmp_buf env;
+volatile int in_poll;
+
+static void sig_exit(int signo)
+{
+	do_exit = 1;
+	if (in_poll)
+		siglongjmp(env, 1);
+}
+
+static void sig_sync(int signo)
+{
+	do_sync = 1;
+	if (in_poll)
+		siglongjmp(env, 1);
+}
+
+static void sig_stats(int signo)
+{
+	do_sync = 1;
+	do_stats = 1;
+	if (in_poll)
+		siglongjmp(env, 1);
+}
+
+static void send_stats(void)
+{
+	syslog(LOG_INFO, "arp_rcv: n%lu c%lu app_rcv: tot %lu hits %lu bad %lu neg %lu sup %lu",
+	       stats.arp_new, stats.arp_change,
+
+	       stats.app_recv, stats.app_success,
+	       stats.app_bad, stats.app_neg, stats.app_suppressed
+	       );
+	syslog(LOG_INFO, "kern: n%lu c%lu neg %lu arp_send: %lu rlim %lu",
+	       stats.kern_new, stats.kern_change, stats.kern_neg,
+
+	       stats.probes_sent, stats.probes_suppressed
+	       );
+	do_stats = 0;
+}
+
+
+int main(int argc, char **argv)
+{
+	int opt;
+	int do_list = 0;
+	char *do_load = NULL;
+
+	while ((opt = getopt(argc, argv, "h?b:lf:a:n:p:kR:B:")) != EOF) {
+		switch (opt) {
+		case 'b':
+			dbname = optarg;
+			break;
+		case 'f':
+			if (do_load) {
+				fprintf(stderr, "Duplicate option -f\n");
+				usage();
+			}
+			do_load = optarg;
+			break;
+		case 'l':
+			do_list = 1;
+			break;
+		case 'a':
+			active_probing = atoi(optarg);
+			break;
+		case 'n':
+			negative_timeout = atoi(optarg);
+			break;
+		case 'k':
+			no_kernel_broadcasts = 1;
+			break;
+		case 'p':
+			if ((poll_timeout = 1000 * strtod(optarg, NULL)) < 100) {
+				fprintf(stderr, "Invalid poll timeout\n");
+				exit(-1);
+			}
+			break;
+		case 'R':
+			if ((broadcast_rate = atoi(optarg)) <= 0 ||
+			    (broadcast_rate = 1000/broadcast_rate) <= 0) {
+				fprintf(stderr, "Invalid ARP rate\n");
+				exit(-1);
+			}
+			break;
+		case 'B':
+			if ((broadcast_burst = atoi(optarg)) <= 0 ||
+			    (broadcast_burst = 1000*broadcast_burst) <= 0) {
+				fprintf(stderr, "Invalid ARP burst\n");
+				exit(-1);
+			}
+			break;
+		case 'h':
+		case '?':
+		default:
+			usage();
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	if (argc > 0) {
+		ifnum = argc;
+		ifnames = argv;
+		ifvec = malloc(argc*sizeof(int));
+		if (!ifvec) {
+			perror("malloc");
+			exit(-1);
+		}
+	}
+
+	if ((udp_sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+		perror("socket");
+		exit(-1);
+	}
+
+	if (ifnum) {
+		int i;
+		struct ifreq ifr = {};
+
+		for (i = 0; i < ifnum; i++) {
+			if (get_ifname(ifr.ifr_name, ifnames[i]))
+				invarg("not a valid ifname", ifnames[i]);
+			if (ioctl(udp_sock, SIOCGIFINDEX, &ifr)) {
+				perror("ioctl(SIOCGIFINDEX)");
+				exit(-1);
+			}
+			ifvec[i] = ifr.ifr_ifindex;
+		}
+	}
+
+	dbase = dbopen(dbname, O_CREAT|O_RDWR, 0644, DB_HASH, NULL);
+	if (dbase == NULL) {
+		perror("db_open");
+		exit(-1);
+	}
+
+	if (do_load) {
+		char buf[128];
+		FILE *fp;
+		struct dbkey k;
+		DBT dbkey, dbdat;
+
+		dbkey.data = &k;
+		dbkey.size = sizeof(k);
+
+		if (strcmp(do_load, "-") == 0 || strcmp(do_load, "--") == 0) {
+			fp = stdin;
+		} else if ((fp = fopen(do_load, "r")) == NULL) {
+			perror("fopen");
+			goto do_abort;
+		}
+
+		buf[sizeof(buf)-1] = 0;
+		while (fgets(buf, sizeof(buf), fp)) {
+			__u8 b1[6];
+			char ipbuf[128];
+			char macbuf[128];
+
+			if (buf[0] == '#')
+				continue;
+
+			if (sscanf(buf, "%u%s%s", &k.iface, ipbuf, macbuf) != 3) {
+				fprintf(stderr, "Wrong format of input file \"%s\"\n", do_load);
+				goto do_abort;
+			}
+			if (strncmp(macbuf, "FAILED:", 7) == 0)
+				continue;
+			if (!inet_aton(ipbuf, (struct in_addr *)&k.addr)) {
+				fprintf(stderr, "Invalid IP address: \"%s\"\n", ipbuf);
+				goto do_abort;
+			}
+
+			if (ll_addr_a2n((char *) b1, 6, macbuf) != 6)
+				goto do_abort;
+			dbdat.size = 6;
+
+			if (dbase->put(dbase, &dbkey, &dbdat, 0)) {
+				perror("hash->put");
+				goto do_abort;
+			}
+		}
+		dbase->sync(dbase, 0);
+		if (fp != stdin)
+			fclose(fp);
+	}
+
+	if (do_list) {
+		DBT dbkey, dbdat;
+
+		printf("%-8s %-15s %s\n", "#Ifindex", "IP", "MAC");
+		while (dbase->seq(dbase, &dbkey, &dbdat, R_NEXT) == 0) {
+			struct dbkey *key = dbkey.data;
+
+			if (handle_if(key->iface)) {
+				if (!IS_NEG(dbdat.data)) {
+					char b1[18];
+
+					printf("%-8d %-15s %s\n",
+					       key->iface,
+					       inet_ntoa(*(struct in_addr *)&key->addr),
+					       ll_addr_n2a(dbdat.data, 6, ARPHRD_ETHER, b1, 18));
+				} else {
+					printf("%-8d %-15s FAILED: %dsec ago\n",
+					       key->iface,
+					       inet_ntoa(*(struct in_addr *)&key->addr),
+					       NEG_AGE(dbdat.data));
+				}
+			}
+		}
+	}
+
+	if (do_load || do_list)
+		goto out;
+
+	pset[0].fd = socket(PF_PACKET, SOCK_DGRAM, 0);
+	if (pset[0].fd < 0) {
+		perror("socket");
+		exit(-1);
+	}
+
+	if (1) {
+		struct sockaddr_ll sll = {
+			.sll_family = AF_PACKET,
+			.sll_protocol = htons(ETH_P_ARP),
+			.sll_ifindex = (ifnum == 1 ? ifvec[0] : 0),
+		};
+
+		if (bind(pset[0].fd, (struct sockaddr *)&sll, sizeof(sll)) < 0) {
+			perror("bind");
+			goto do_abort;
+		}
+	}
+
+	if (rtnl_open(&rth, RTMGRP_NEIGH) < 0) {
+		perror("rtnl_open");
+		goto do_abort;
+	}
+	pset[1].fd = rth.fd;
+
+	load_initial_table();
+
+	if (daemon(0, 0)) {
+		perror("arpd: daemon");
+		goto do_abort;
+	}
+
+	openlog("arpd", LOG_PID | LOG_CONS, LOG_DAEMON);
+	catch_signal(SIGINT, sig_exit);
+	catch_signal(SIGTERM, sig_exit);
+	catch_signal(SIGHUP, sig_sync);
+	catch_signal(SIGUSR1, sig_stats);
+
+#define EVENTS (POLLIN|POLLPRI|POLLERR|POLLHUP)
+	pset[0].events = EVENTS;
+	pset[0].revents = 0;
+	pset[1].events = EVENTS;
+	pset[1].revents = 0;
+
+	sigsetjmp(env, 1);
+
+	for (;;) {
+		in_poll = 1;
+
+		if (do_exit)
+			break;
+		if (do_sync) {
+			in_poll = 0;
+			dbase->sync(dbase, 0);
+			do_sync = 0;
+			in_poll = 1;
+		}
+		if (do_stats)
+			send_stats();
+		if (poll(pset, 2, poll_timeout) > 0) {
+			in_poll = 0;
+			if (pset[0].revents&EVENTS)
+				get_arp_pkt();
+			if (pset[1].revents&EVENTS)
+				get_kern_msg();
+		} else {
+			do_sync = 1;
+		}
+	}
+
+	undo_sysctl_adjustments();
+out:
+	dbase->close(dbase);
+	exit(0);
+
+do_abort:
+	dbase->close(dbase);
+	exit(-1);
+}
diff --git a/misc/ifstat.c b/misc/ifstat.c
new file mode 100644
index 0000000..7290109
--- /dev/null
+++ b/misc/ifstat.c
@@ -0,0 +1,1040 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * ifstat.c	handy utility to read net interface statistics
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+#include <sys/time.h>
+#include <fnmatch.h>
+#include <sys/file.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/poll.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <signal.h>
+#include <math.h>
+#include <getopt.h>
+
+#include <linux/if.h>
+#include <linux/if_link.h>
+
+#include "libnetlink.h"
+#include "json_writer.h"
+#include "version.h"
+#include "utils.h"
+
+int dump_zeros;
+int reset_history;
+int ignore_history;
+int no_output;
+int json_output;
+int no_update;
+int scan_interval;
+int time_constant;
+int show_errors;
+double W;
+char **patterns;
+int npatterns;
+bool is_extended;
+int filter_type;
+int sub_type;
+
+char info_source[128];
+int source_mismatch;
+
+#define MAXS (sizeof(struct rtnl_link_stats)/sizeof(__u32))
+#define NO_SUB_TYPE 0xffff
+
+struct ifstat_ent {
+	struct ifstat_ent	*next;
+	char			*name;
+	int			ifindex;
+	unsigned long long	val[MAXS];
+	double			rate[MAXS];
+	__u32			ival[MAXS];
+};
+
+static const char *stats[MAXS] = {
+	"rx_packets",
+	"tx_packets",
+	"rx_bytes",
+	"tx_bytes",
+	"rx_errors",
+	"tx_errors",
+	"rx_dropped",
+	"tx_dropped",
+	"multicast",
+	"collisions",
+	"rx_length_errors",
+	"rx_over_errors",
+	"rx_crc_errors",
+	"rx_frame_errors",
+	"rx_fifo_errors",
+	"rx_missed_errors",
+	"tx_aborted_errors",
+	"tx_carrier_errors",
+	"tx_fifo_errors",
+	"tx_heartbeat_errors",
+	"tx_window_errors",
+	"rx_compressed",
+	"tx_compressed"
+};
+
+struct ifstat_ent *kern_db;
+struct ifstat_ent *hist_db;
+
+static int match(const char *id)
+{
+	int i;
+
+	if (npatterns == 0)
+		return 1;
+
+	for (i = 0; i < npatterns; i++) {
+		if (!fnmatch(patterns[i], id, FNM_CASEFOLD))
+			return 1;
+	}
+	return 0;
+}
+
+static int get_nlmsg_extended(struct nlmsghdr *m, void *arg)
+{
+	struct if_stats_msg *ifsm = NLMSG_DATA(m);
+	struct rtattr *tb[IFLA_STATS_MAX+1];
+	int len = m->nlmsg_len;
+	struct ifstat_ent *n;
+
+	if (m->nlmsg_type != RTM_NEWSTATS)
+		return 0;
+
+	len -= NLMSG_LENGTH(sizeof(*ifsm));
+	if (len < 0) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	parse_rtattr(tb, IFLA_STATS_MAX, IFLA_STATS_RTA(ifsm), len);
+	if (tb[filter_type] == NULL)
+		return 0;
+
+	n = malloc(sizeof(*n));
+	if (!n) {
+		errno = ENOMEM;
+		return -1;
+	}
+
+	n->ifindex = ifsm->ifindex;
+	n->name = strdup(ll_index_to_name(ifsm->ifindex));
+
+	if (sub_type == NO_SUB_TYPE) {
+		memcpy(&n->val, RTA_DATA(tb[filter_type]), sizeof(n->val));
+	} else {
+		struct rtattr *attr;
+
+		attr = parse_rtattr_one_nested(sub_type, tb[filter_type]);
+		if (attr == NULL) {
+			free(n);
+			return 0;
+		}
+		memcpy(&n->val, RTA_DATA(attr), sizeof(n->val));
+	}
+	memset(&n->rate, 0, sizeof(n->rate));
+	n->next = kern_db;
+	kern_db = n;
+	return 0;
+}
+
+static int get_nlmsg(struct nlmsghdr *m, void *arg)
+{
+	struct ifinfomsg *ifi = NLMSG_DATA(m);
+	struct rtattr *tb[IFLA_MAX+1];
+	int len = m->nlmsg_len;
+	struct ifstat_ent *n;
+	int i;
+
+	if (m->nlmsg_type != RTM_NEWLINK)
+		return 0;
+
+	len -= NLMSG_LENGTH(sizeof(*ifi));
+	if (len < 0) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (!(ifi->ifi_flags&IFF_UP))
+		return 0;
+
+	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
+	if (tb[IFLA_IFNAME] == NULL || tb[IFLA_STATS] == NULL)
+		return 0;
+
+	n = malloc(sizeof(*n));
+	if (!n) {
+		errno = ENOMEM;
+		return -1;
+	}
+	n->ifindex = ifi->ifi_index;
+	n->name = strdup(RTA_DATA(tb[IFLA_IFNAME]));
+	memcpy(&n->ival, RTA_DATA(tb[IFLA_STATS]), sizeof(n->ival));
+	memset(&n->rate, 0, sizeof(n->rate));
+	for (i = 0; i < MAXS; i++)
+		n->val[i] = n->ival[i];
+	n->next = kern_db;
+	kern_db = n;
+	return 0;
+}
+
+static void load_info(void)
+{
+	struct ifstat_ent *db, *n;
+	struct rtnl_handle rth;
+	__u32 filter_mask;
+
+	if (rtnl_open(&rth, 0) < 0)
+		exit(1);
+
+	if (is_extended) {
+		ll_init_map(&rth);
+		filter_mask = IFLA_STATS_FILTER_BIT(filter_type);
+		if (rtnl_statsdump_req_filter(&rth, AF_UNSPEC,
+					      filter_mask, NULL, NULL) < 0) {
+			perror("Cannot send dump request");
+			exit(1);
+		}
+
+		if (rtnl_dump_filter(&rth, get_nlmsg_extended, NULL) < 0) {
+			perror("Dump terminated\n");
+			exit(1);
+		}
+	} else {
+		if (rtnl_linkdump_req(&rth, AF_INET) < 0) {
+			perror("Cannot send dump request");
+			exit(1);
+		}
+
+		if (rtnl_dump_filter(&rth, get_nlmsg, NULL) < 0) {
+			perror("Dump terminated\n");
+			exit(1);
+		}
+	}
+
+	rtnl_close(&rth);
+
+	db = kern_db;
+	kern_db = NULL;
+
+	while (db) {
+		n = db;
+		db = db->next;
+		n->next = kern_db;
+		kern_db = n;
+	}
+}
+
+static void load_raw_table(FILE *fp)
+{
+	char buf[4096];
+	struct ifstat_ent *db = NULL;
+	struct ifstat_ent *n;
+
+	while (fgets(buf, sizeof(buf), fp) != NULL) {
+		char *p;
+		char *next;
+		int i;
+
+		if (buf[0] == '#') {
+			buf[strlen(buf)-1] = 0;
+			if (info_source[0] && strcmp(info_source, buf+1))
+				source_mismatch = 1;
+			strlcpy(info_source, buf+1, sizeof(info_source));
+			continue;
+		}
+		if ((n = malloc(sizeof(*n))) == NULL)
+			abort();
+
+		if (!(p = strchr(buf, ' ')))
+			abort();
+		*p++ = 0;
+
+		if (sscanf(buf, "%d", &n->ifindex) != 1)
+			abort();
+		if (!(next = strchr(p, ' ')))
+			abort();
+		*next++ = 0;
+
+		n->name = strdup(p);
+		p = next;
+
+		for (i = 0; i < MAXS; i++) {
+			unsigned int rate;
+
+			if (!(next = strchr(p, ' ')))
+				abort();
+			*next++ = 0;
+			if (sscanf(p, "%llu", n->val+i) != 1)
+				abort();
+			n->ival[i] = (__u32)n->val[i];
+			p = next;
+			if (!(next = strchr(p, ' ')))
+				abort();
+			*next++ = 0;
+			if (sscanf(p, "%u", &rate) != 1)
+				abort();
+			n->rate[i] = rate;
+			p = next;
+		}
+		n->next = db;
+		db = n;
+	}
+
+	while (db) {
+		n = db;
+		db = db->next;
+		n->next = kern_db;
+		kern_db = n;
+	}
+}
+
+static void dump_raw_db(FILE *fp, int to_hist)
+{
+	json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
+	struct ifstat_ent *n, *h;
+
+	h = hist_db;
+	if (jw) {
+		jsonw_start_object(jw);
+		jsonw_pretty(jw, pretty);
+		jsonw_name(jw, info_source);
+		jsonw_start_object(jw);
+	} else
+		fprintf(fp, "#%s\n", info_source);
+
+	for (n = kern_db; n; n = n->next) {
+		int i;
+		unsigned long long *vals = n->val;
+		double *rates = n->rate;
+
+		if (!match(n->name)) {
+			struct ifstat_ent *h1;
+
+			if (!to_hist)
+				continue;
+			for (h1 = h; h1; h1 = h1->next) {
+				if (h1->ifindex == n->ifindex) {
+					vals = h1->val;
+					rates = h1->rate;
+					h = h1->next;
+					break;
+				}
+			}
+		}
+
+		if (jw) {
+			jsonw_name(jw, n->name);
+			jsonw_start_object(jw);
+
+			for (i = 0; i < MAXS && stats[i]; i++)
+				jsonw_uint_field(jw, stats[i], vals[i]);
+			jsonw_end_object(jw);
+		} else {
+			fprintf(fp, "%d %s ", n->ifindex, n->name);
+			for (i = 0; i < MAXS; i++)
+				fprintf(fp, "%llu %u ", vals[i],
+					(unsigned int)rates[i]);
+			fprintf(fp, "\n");
+		}
+	}
+	if (jw) {
+		jsonw_end_object(jw);
+
+		jsonw_end_object(jw);
+		jsonw_destroy(&jw);
+	}
+}
+
+/* use communication definitions of meg/kilo etc */
+static const unsigned long long giga = 1000000000ull;
+static const unsigned long long mega = 1000000;
+static const unsigned long long kilo = 1000;
+
+static void format_rate(FILE *fp, const unsigned long long *vals,
+			const double *rates, int i)
+{
+	char temp[64];
+
+	if (vals[i] > giga)
+		fprintf(fp, "%7lluM ", vals[i]/mega);
+	else if (vals[i] > mega)
+		fprintf(fp, "%7lluK ", vals[i]/kilo);
+	else
+		fprintf(fp, "%8llu ", vals[i]);
+
+	if (rates[i] > mega) {
+		sprintf(temp, "%uM", (unsigned int)(rates[i]/mega));
+		fprintf(fp, "%-6s ", temp);
+	} else if (rates[i] > kilo) {
+		sprintf(temp, "%uK", (unsigned int)(rates[i]/kilo));
+		fprintf(fp, "%-6s ", temp);
+	} else
+		fprintf(fp, "%-6u ", (unsigned int)rates[i]);
+}
+
+static void format_pair(FILE *fp, const unsigned long long *vals, int i, int k)
+{
+	char temp[64];
+
+	if (vals[i] > giga)
+		fprintf(fp, "%7lluM ", vals[i]/mega);
+	else if (vals[i] > mega)
+		fprintf(fp, "%7lluK ", vals[i]/kilo);
+	else
+		fprintf(fp, "%8llu ", vals[i]);
+
+	if (vals[k] > giga) {
+		sprintf(temp, "%uM", (unsigned int)(vals[k]/mega));
+		fprintf(fp, "%-6s ", temp);
+	} else if (vals[k] > mega) {
+		sprintf(temp, "%uK", (unsigned int)(vals[k]/kilo));
+		fprintf(fp, "%-6s ", temp);
+	} else
+		fprintf(fp, "%-6u ", (unsigned int)vals[k]);
+}
+
+static void print_head(FILE *fp)
+{
+	fprintf(fp, "#%s\n", info_source);
+	fprintf(fp, "%-15s ", "Interface");
+
+	fprintf(fp, "%8s/%-6s ", "RX Pkts", "Rate");
+	fprintf(fp, "%8s/%-6s ", "TX Pkts", "Rate");
+	fprintf(fp, "%8s/%-6s ", "RX Data", "Rate");
+	fprintf(fp, "%8s/%-6s\n", "TX Data", "Rate");
+
+	if (!show_errors) {
+		fprintf(fp, "%-15s ", "");
+		fprintf(fp, "%8s/%-6s ", "RX Errs", "Drop");
+		fprintf(fp, "%8s/%-6s ", "TX Errs", "Drop");
+		fprintf(fp, "%8s/%-6s ", "RX Over", "Rate");
+		fprintf(fp, "%8s/%-6s\n", "TX Coll", "Rate");
+	} else {
+		fprintf(fp, "%-15s ", "");
+		fprintf(fp, "%8s/%-6s ", "RX Errs", "Rate");
+		fprintf(fp, "%8s/%-6s ", "RX Drop", "Rate");
+		fprintf(fp, "%8s/%-6s ", "RX Over", "Rate");
+		fprintf(fp, "%8s/%-6s\n", "RX Leng", "Rate");
+
+		fprintf(fp, "%-15s ", "");
+		fprintf(fp, "%8s/%-6s ", "RX Crc", "Rate");
+		fprintf(fp, "%8s/%-6s ", "RX Frm", "Rate");
+		fprintf(fp, "%8s/%-6s ", "RX Fifo", "Rate");
+		fprintf(fp, "%8s/%-6s\n", "RX Miss", "Rate");
+
+		fprintf(fp, "%-15s ", "");
+		fprintf(fp, "%8s/%-6s ", "TX Errs", "Rate");
+		fprintf(fp, "%8s/%-6s ", "TX Drop", "Rate");
+		fprintf(fp, "%8s/%-6s ", "TX Coll", "Rate");
+		fprintf(fp, "%8s/%-6s\n", "TX Carr", "Rate");
+
+		fprintf(fp, "%-15s ", "");
+		fprintf(fp, "%8s/%-6s ", "TX Abrt", "Rate");
+		fprintf(fp, "%8s/%-6s ", "TX Fifo", "Rate");
+		fprintf(fp, "%8s/%-6s ", "TX Hear", "Rate");
+		fprintf(fp, "%8s/%-6s\n", "TX Wind", "Rate");
+	}
+}
+
+static void print_one_json(json_writer_t *jw, const struct ifstat_ent *n,
+			   const unsigned long long *vals)
+{
+	int i, m = show_errors ? 20 : 10;
+
+	jsonw_name(jw, n->name);
+	jsonw_start_object(jw);
+
+	for (i = 0; i < m && stats[i]; i++)
+		jsonw_uint_field(jw, stats[i], vals[i]);
+
+	jsonw_end_object(jw);
+}
+
+static void print_one_if(FILE *fp, const struct ifstat_ent *n,
+			 const unsigned long long *vals)
+{
+	int i;
+
+	fprintf(fp, "%-15s ", n->name);
+	for (i = 0; i < 4; i++)
+		format_rate(fp, vals, n->rate, i);
+	fprintf(fp, "\n");
+
+	if (!show_errors) {
+		fprintf(fp, "%-15s ", "");
+		format_pair(fp, vals, 4, 6);
+		format_pair(fp, vals, 5, 7);
+		format_rate(fp, vals, n->rate, 11);
+		format_rate(fp, vals, n->rate, 9);
+		fprintf(fp, "\n");
+	} else {
+		fprintf(fp, "%-15s ", "");
+		format_rate(fp, vals, n->rate, 4);
+		format_rate(fp, vals, n->rate, 6);
+		format_rate(fp, vals, n->rate, 11);
+		format_rate(fp, vals, n->rate, 10);
+		fprintf(fp, "\n");
+
+		fprintf(fp, "%-15s ", "");
+		format_rate(fp, vals, n->rate, 12);
+		format_rate(fp, vals, n->rate, 13);
+		format_rate(fp, vals, n->rate, 14);
+		format_rate(fp, vals, n->rate, 15);
+		fprintf(fp, "\n");
+
+		fprintf(fp, "%-15s ", "");
+		format_rate(fp, vals, n->rate, 5);
+		format_rate(fp, vals, n->rate, 7);
+		format_rate(fp, vals, n->rate, 9);
+		format_rate(fp, vals, n->rate, 17);
+		fprintf(fp, "\n");
+
+		fprintf(fp, "%-15s ", "");
+		format_rate(fp, vals, n->rate, 16);
+		format_rate(fp, vals, n->rate, 18);
+		format_rate(fp, vals, n->rate, 19);
+		format_rate(fp, vals, n->rate, 20);
+		fprintf(fp, "\n");
+	}
+}
+
+static void dump_kern_db(FILE *fp)
+{
+	json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
+	struct ifstat_ent *n;
+
+	if (jw) {
+		jsonw_start_object(jw);
+		jsonw_pretty(jw, pretty);
+		jsonw_name(jw, info_source);
+		jsonw_start_object(jw);
+	} else
+		print_head(fp);
+
+	for (n = kern_db; n; n = n->next) {
+		if (!match(n->name))
+			continue;
+
+		if (jw)
+			print_one_json(jw, n, n->val);
+		else
+			print_one_if(fp, n, n->val);
+	}
+	if (jw) {
+		jsonw_end_object(jw);
+
+		jsonw_end_object(jw);
+		jsonw_destroy(&jw);
+	}
+}
+
+static void dump_incr_db(FILE *fp)
+{
+	struct ifstat_ent *n, *h;
+	json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
+
+	h = hist_db;
+	if (jw) {
+		jsonw_start_object(jw);
+		jsonw_pretty(jw, pretty);
+		jsonw_name(jw, info_source);
+		jsonw_start_object(jw);
+	} else
+		print_head(fp);
+
+	for (n = kern_db; n; n = n->next) {
+		int i;
+		unsigned long long vals[MAXS];
+		struct ifstat_ent *h1;
+
+		memcpy(vals, n->val, sizeof(vals));
+
+		for (h1 = h; h1; h1 = h1->next) {
+			if (h1->ifindex == n->ifindex) {
+				for (i = 0; i < MAXS; i++)
+					vals[i] -= h1->val[i];
+				h = h1->next;
+				break;
+			}
+		}
+		if (!match(n->name))
+			continue;
+
+		if (jw)
+			print_one_json(jw, n, n->val);
+		else
+			print_one_if(fp, n, vals);
+	}
+
+	if (jw) {
+		jsonw_end_object(jw);
+
+		jsonw_end_object(jw);
+		jsonw_destroy(&jw);
+	}
+}
+
+static int children;
+
+static void sigchild(int signo)
+{
+}
+
+static void update_db(int interval)
+{
+	struct ifstat_ent *n, *h;
+
+	n = kern_db;
+	kern_db = NULL;
+
+	load_info();
+
+	h = kern_db;
+	kern_db = n;
+
+	for (n = kern_db; n; n = n->next) {
+		struct ifstat_ent *h1;
+
+		for (h1 = h; h1; h1 = h1->next) {
+			if (h1->ifindex == n->ifindex) {
+				int i;
+
+				for (i = 0; i < MAXS; i++) {
+					if (h1->ival[i] < n->ival[i]) {
+						memset(n->ival, 0, sizeof(n->ival));
+						break;
+					}
+				}
+				for (i = 0; i < MAXS; i++) {
+					double sample;
+					__u64 incr;
+
+					if (is_extended) {
+						incr = h1->val[i] - n->val[i];
+						n->val[i] = h1->val[i];
+					} else {
+						incr = (__u32) (h1->ival[i] - n->ival[i]);
+						n->val[i] += incr;
+						n->ival[i] = h1->ival[i];
+					}
+
+					sample = (double)(incr*1000)/interval;
+					if (interval >= scan_interval) {
+						n->rate[i] += W*(sample-n->rate[i]);
+					} else if (interval >= 1000) {
+						if (interval >= time_constant) {
+							n->rate[i] = sample;
+						} else {
+							double w = W*(double)interval/scan_interval;
+
+							n->rate[i] += w*(sample-n->rate[i]);
+						}
+					}
+				}
+
+				while (h != h1) {
+					struct ifstat_ent *tmp = h;
+
+					h = h->next;
+					free(tmp->name);
+					free(tmp);
+				};
+				h = h1->next;
+				free(h1->name);
+				free(h1);
+				break;
+			}
+		}
+	}
+}
+
+#define T_DIFF(a, b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
+
+
+static void server_loop(int fd)
+{
+	struct timeval snaptime = { 0 };
+	struct pollfd p;
+
+	p.fd = fd;
+	p.events = p.revents = POLLIN;
+
+	sprintf(info_source, "%d.%lu sampling_interval=%d time_const=%d",
+		getpid(), (unsigned long)random(), scan_interval/1000, time_constant/1000);
+
+	load_info();
+
+	for (;;) {
+		int status;
+		time_t tdiff;
+		struct timeval now;
+
+		gettimeofday(&now, NULL);
+		tdiff = T_DIFF(now, snaptime);
+		if (tdiff >= scan_interval) {
+			update_db(tdiff);
+			snaptime = now;
+			tdiff = 0;
+		}
+
+		if (poll(&p, 1, scan_interval - tdiff) > 0
+		    && (p.revents&POLLIN)) {
+			int clnt = accept(fd, NULL, NULL);
+
+			if (clnt >= 0) {
+				pid_t pid;
+
+				if (children >= 5) {
+					close(clnt);
+				} else if ((pid = fork()) != 0) {
+					if (pid > 0)
+						children++;
+					close(clnt);
+				} else {
+					FILE *fp = fdopen(clnt, "w");
+
+					if (fp)
+						dump_raw_db(fp, 0);
+					exit(0);
+				}
+			}
+		}
+		while (children && waitpid(-1, &status, WNOHANG) > 0)
+			children--;
+	}
+}
+
+static int verify_forging(int fd)
+{
+	struct ucred cred;
+	socklen_t olen = sizeof(cred);
+
+	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &olen) ||
+	    olen < sizeof(cred))
+		return -1;
+	if (cred.uid == getuid() || cred.uid == 0)
+		return 0;
+	return -1;
+}
+
+static void xstat_usage(void)
+{
+	fprintf(stderr,
+"Usage: ifstat supported xstats:\n"
+"       cpu_hits       Counts only packets that went via the CPU.\n");
+}
+
+struct extended_stats_options_t {
+	char *name;
+	int id;
+	int sub_type;
+};
+
+/* Note: if one xstat name is subset of another, it should be before it in this
+ * list.
+ * Name length must be under 64 chars.
+ */
+static const struct extended_stats_options_t extended_stats_options[] = {
+	{"cpu_hits",  IFLA_STATS_LINK_OFFLOAD_XSTATS, IFLA_OFFLOAD_XSTATS_CPU_HIT},
+};
+
+static const char *get_filter_type(const char *name)
+{
+	int name_len;
+	int i;
+
+	name_len = strlen(name);
+	for (i = 0; i < ARRAY_SIZE(extended_stats_options); i++) {
+		const struct extended_stats_options_t *xstat;
+
+		xstat = &extended_stats_options[i];
+		if (strncmp(name, xstat->name, name_len) == 0) {
+			filter_type = xstat->id;
+			sub_type = xstat->sub_type;
+			return xstat->name;
+		}
+	}
+
+	fprintf(stderr, "invalid ifstat extension %s\n", name);
+	xstat_usage();
+	return NULL;
+}
+
+static void usage(void) __attribute__((noreturn));
+
+static void usage(void)
+{
+	fprintf(stderr,
+"Usage: ifstat [OPTION] [ PATTERN [ PATTERN ] ]\n"
+"   -h, --help           this message\n"
+"   -a, --ignore         ignore history\n"
+"   -d, --scan=SECS      sample every statistics every SECS\n"
+"   -e, --errors         show errors\n"
+"   -j, --json           format output in JSON\n"
+"   -n, --nooutput       do history only\n"
+"   -p, --pretty         pretty print\n"
+"   -r, --reset          reset history\n"
+"   -s, --noupdate       don't update history\n"
+"   -t, --interval=SECS  report average over the last SECS\n"
+"   -V, --version        output version information\n"
+"   -z, --zeros          show entries with zero activity\n"
+"   -x, --extended=TYPE  show extended stats of TYPE\n");
+
+	exit(-1);
+}
+
+static const struct option longopts[] = {
+	{ "help", 0, 0, 'h' },
+	{ "ignore",  0,  0, 'a' },
+	{ "scan", 1, 0, 'd'},
+	{ "errors", 0, 0, 'e' },
+	{ "nooutput", 0, 0, 'n' },
+	{ "json", 0, 0, 'j' },
+	{ "reset", 0, 0, 'r' },
+	{ "pretty", 0, 0, 'p' },
+	{ "noupdate", 0, 0, 's' },
+	{ "interval", 1, 0, 't' },
+	{ "version", 0, 0, 'V' },
+	{ "zeros", 0, 0, 'z' },
+	{ "extended", 1, 0, 'x'},
+	{ 0 }
+};
+
+int main(int argc, char *argv[])
+{
+	char hist_name[128];
+	struct sockaddr_un sun;
+	FILE *hist_fp = NULL;
+	const char *stats_type = NULL;
+	int ch;
+	int fd;
+
+	is_extended = false;
+	while ((ch = getopt_long(argc, argv, "hjpvVzrnasd:t:ex:",
+			longopts, NULL)) != EOF) {
+		switch (ch) {
+		case 'z':
+			dump_zeros = 1;
+			break;
+		case 'r':
+			reset_history = 1;
+			break;
+		case 'a':
+			ignore_history = 1;
+			break;
+		case 's':
+			no_update = 1;
+			break;
+		case 'n':
+			no_output = 1;
+			break;
+		case 'e':
+			show_errors = 1;
+			break;
+		case 'j':
+			json_output = 1;
+			break;
+		case 'p':
+			pretty = 1;
+			break;
+		case 'd':
+			scan_interval = atoi(optarg) * 1000;
+			if (scan_interval <= 0) {
+				fprintf(stderr, "ifstat: invalid scan interval\n");
+				exit(-1);
+			}
+			break;
+		case 't':
+			time_constant = atoi(optarg);
+			if (time_constant <= 0) {
+				fprintf(stderr, "ifstat: invalid time constant divisor\n");
+				exit(-1);
+			}
+			break;
+		case 'x':
+			stats_type = optarg;
+			is_extended = true;
+			break;
+		case 'v':
+		case 'V':
+			printf("ifstat utility, iproute2-%s\n", version);
+			exit(0);
+		case 'h':
+		case '?':
+		default:
+			usage();
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	if (stats_type) {
+		stats_type = get_filter_type(stats_type);
+		if (!stats_type)
+			exit(-1);
+	}
+
+	sun.sun_family = AF_UNIX;
+	sun.sun_path[0] = 0;
+	sprintf(sun.sun_path+1, "ifstat%d", getuid());
+
+	if (scan_interval > 0) {
+		if (time_constant == 0)
+			time_constant = 60;
+		time_constant *= 1000;
+		W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
+		if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
+			perror("ifstat: socket");
+			exit(-1);
+		}
+		if (bind(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
+			perror("ifstat: bind");
+			exit(-1);
+		}
+		if (listen(fd, 5) < 0) {
+			perror("ifstat: listen");
+			exit(-1);
+		}
+		if (daemon(0, 0)) {
+			perror("ifstat: daemon");
+			exit(-1);
+		}
+		signal(SIGPIPE, SIG_IGN);
+		signal(SIGCHLD, sigchild);
+		server_loop(fd);
+		exit(0);
+	}
+
+	patterns = argv;
+	npatterns = argc;
+
+	if (getenv("IFSTAT_HISTORY"))
+		snprintf(hist_name, sizeof(hist_name),
+			 "%s", getenv("IFSTAT_HISTORY"));
+	else
+		if (!stats_type)
+			snprintf(hist_name, sizeof(hist_name),
+				 "%s/.ifstat.u%d", P_tmpdir, getuid());
+		else
+			snprintf(hist_name, sizeof(hist_name),
+				 "%s/.%s_ifstat.u%d", P_tmpdir, stats_type,
+				 getuid());
+
+	if (reset_history && unlink(hist_name) < 0) {
+		perror("ifstat: unlink history file");
+		exit(-1);
+	}
+
+	if (!ignore_history || !no_update) {
+		struct stat stb;
+
+		fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600);
+		if (fd < 0) {
+			perror("ifstat: open history file");
+			exit(-1);
+		}
+		if ((hist_fp = fdopen(fd, "r+")) == NULL) {
+			perror("ifstat: fdopen history file");
+			exit(-1);
+		}
+		if (flock(fileno(hist_fp), LOCK_EX)) {
+			perror("ifstat: flock history file");
+			exit(-1);
+		}
+		if (fstat(fileno(hist_fp), &stb) != 0) {
+			perror("ifstat: fstat history file");
+			exit(-1);
+		}
+		if (stb.st_nlink != 1 || stb.st_uid != getuid()) {
+			fprintf(stderr, "ifstat: something is so wrong with history file, that I prefer not to proceed.\n");
+			exit(-1);
+		}
+		if (!ignore_history) {
+			FILE *tfp;
+			long uptime = -1;
+
+			if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
+				if (fscanf(tfp, "%ld", &uptime) != 1)
+					uptime = -1;
+				fclose(tfp);
+			}
+			if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
+				fprintf(stderr, "ifstat: history is aged out, resetting\n");
+				if (ftruncate(fileno(hist_fp), 0))
+					perror("ifstat: ftruncate");
+			}
+		}
+
+		load_raw_table(hist_fp);
+
+		hist_db = kern_db;
+		kern_db = NULL;
+	}
+
+	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
+	    (connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0
+	     || (strcpy(sun.sun_path+1, "ifstat0"),
+		 connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
+	    && verify_forging(fd) == 0) {
+		FILE *sfp = fdopen(fd, "r");
+
+		if (!sfp) {
+			fprintf(stderr, "ifstat: fdopen failed: %s\n",
+				strerror(errno));
+			close(fd);
+		} else  {
+			load_raw_table(sfp);
+			if (hist_db && source_mismatch) {
+				fprintf(stderr, "ifstat: history is stale, ignoring it.\n");
+				hist_db = NULL;
+			}
+			fclose(sfp);
+		}
+	} else {
+		if (fd >= 0)
+			close(fd);
+		if (hist_db && info_source[0] && strcmp(info_source, "kernel")) {
+			fprintf(stderr, "ifstat: history is stale, ignoring it.\n");
+			hist_db = NULL;
+			info_source[0] = 0;
+		}
+		load_info();
+		if (info_source[0] == 0)
+			strcpy(info_source, "kernel");
+	}
+
+	if (!no_output) {
+		if (ignore_history || hist_db == NULL)
+			dump_kern_db(stdout);
+		else
+			dump_incr_db(stdout);
+	}
+
+	if (!no_update) {
+		if (ftruncate(fileno(hist_fp), 0))
+			perror("ifstat: ftruncate");
+		rewind(hist_fp);
+
+		json_output = 0;
+		dump_raw_db(hist_fp, 1);
+		fclose(hist_fp);
+	}
+	exit(0);
+}
diff --git a/misc/lnstat.c b/misc/lnstat.c
new file mode 100644
index 0000000..f802a0f
--- /dev/null
+++ b/misc/lnstat.c
@@ -0,0 +1,379 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* lnstat - Unified linux network statistics
+ *
+ * Copyright (C) 2004 by Harald Welte <laforge@gnumonks.org>
+ *
+ * Development of this code was funded by Astaro AG, http://www.astaro.com/
+ *
+ * Based on original concept and ideas from predecessor rtstat.c:
+ *
+ * Copyright 2001 by Robert Olsson <robert.olsson@its.uu.se>
+ *                                 Uppsala University, Sweden
+ */
+
+/* Maximum number of fields that can be displayed */
+#define MAX_FIELDS		128
+
+/* Maximum number of header lines */
+#define HDR_LINES		10
+
+/* default field width if none specified */
+#define FIELD_WIDTH_DEFAULT	8
+#define FIELD_WIDTH_MAX		20
+
+#define DEFAULT_INTERVAL	2
+
+#define HDR_LINE_LENGTH		(MAX_FIELDS*FIELD_WIDTH_MAX)
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
+
+#include <json_writer.h>
+#include "lnstat.h"
+#include "version.h"
+
+static struct option opts[] = {
+	{ "version", 0, NULL, 'V' },
+	{ "count", 1, NULL, 'c' },
+	{ "dump", 0, NULL, 'd' },
+	{ "json", 0, NULL, 'j' },
+	{ "file", 1, NULL, 'f' },
+	{ "help", 0, NULL, 'h' },
+	{ "interval", 1, NULL, 'i' },
+	{ "keys", 1, NULL, 'k' },
+	{ "subject", 1, NULL, 's' },
+	{ "width", 1, NULL, 'w' },
+	{ "oneline", 0, NULL, 0 },
+};
+
+static int usage(char *name, int exit_code)
+{
+	fprintf(stderr,
+		"%s Version %s\n"
+		"Copyright (C) 2004 by Harald Welte <laforge@gnumonks.org>\n"
+		"This program is free software licensed under GNU GPLv2\nwith ABSOLUTELY NO WARRANTY.\n"
+		"\n"
+		"Parameters:\n"
+		"	-V --version		Print Version of Program\n"
+		"	-c --count <count>	"
+		"Print <count> number of intervals\n"
+		"	-d --dump		"
+		"Dump list of available files/keys\n"
+		"	-j --json		"
+		"Display in JSON format\n"
+		"	-f --file <file>	Statistics file to use\n"
+		"	-h --help		This help message\n"
+		"	-i --interval <intv>	"
+		"Set interval to 'intv' seconds\n"
+		"	-k --keys k,k,k,...	Display only keys specified\n"
+		"	-s --subject [0-2]	Control header printing:\n"
+		"				0 = never\n"
+		"				1 = once\n"
+		"				2 = every 20 lines (default))\n"
+		"	-w --width n,n,n,...	Width for each field\n"
+		"\n",
+		name, version);
+
+	exit(exit_code);
+}
+
+struct field_param {
+	const char *name;
+	struct lnstat_field *lf;
+	struct {
+		unsigned int width;
+	} print;
+};
+
+struct field_params {
+	unsigned int num;
+	struct field_param params[MAX_FIELDS];
+};
+
+static void print_line(FILE *of, const struct lnstat_file *lnstat_files,
+		       const struct field_params *fp)
+{
+	int i;
+
+	for (i = 0; i < fp->num; i++) {
+		const struct lnstat_field *lf = fp->params[i].lf;
+
+		fprintf(of, "%*lu|", fp->params[i].print.width, lf->result);
+	}
+	fputc('\n', of);
+}
+
+static void print_json(FILE *of, const struct lnstat_file *lnstat_files,
+		       const struct field_params *fp)
+{
+	json_writer_t *jw = jsonw_new(of);
+	int i;
+
+	if (jw == NULL) {
+		fprintf(stderr, "Failed to create JSON writer\n");
+		exit(1);
+	}
+	jsonw_start_object(jw);
+	for (i = 0; i < fp->num; i++) {
+		const struct lnstat_field *lf = fp->params[i].lf;
+
+		jsonw_uint_field(jw, lf->name, lf->result);
+	}
+	jsonw_end_object(jw);
+	jsonw_destroy(&jw);
+}
+
+/* find lnstat_field according to user specification */
+static int map_field_params(struct lnstat_file *lnstat_files,
+			    struct field_params *fps, int interval)
+{
+	int i, j = 0;
+	struct lnstat_file *lf;
+
+	/* no field specification on commandline, need to build default */
+	if (!fps->num) {
+		for (lf = lnstat_files; lf; lf = lf->next) {
+			for (i = 0; i < lf->num_fields; i++) {
+				fps->params[j].lf = &lf->fields[i];
+				fps->params[j].lf->file->interval.tv_sec =
+								interval;
+				if (!fps->params[j].print.width)
+					fps->params[j].print.width =
+							FIELD_WIDTH_DEFAULT;
+
+				if (++j >= MAX_FIELDS - 1) {
+					fprintf(stderr,
+						"WARN: MAX_FIELDS (%d) reached, truncating number of keys\n",
+						MAX_FIELDS);
+					goto full;
+				}
+			}
+		}
+full:
+		fps->num = j;
+		return 1;
+	}
+
+	for (i = 0; i < fps->num; i++) {
+		fps->params[i].lf = lnstat_find_field(lnstat_files,
+						      fps->params[i].name);
+		if (!fps->params[i].lf) {
+			fprintf(stderr, "Field `%s' unknown\n",
+				fps->params[i].name);
+			return 0;
+		}
+		fps->params[i].lf->file->interval.tv_sec = interval;
+		if (!fps->params[i].print.width)
+			fps->params[i].print.width = FIELD_WIDTH_DEFAULT;
+	}
+	return 1;
+}
+
+struct table_hdr {
+	int num_lines;
+	char *hdr[HDR_LINES];
+};
+
+static struct table_hdr *build_hdr_string(struct lnstat_file *lnstat_files,
+					  struct field_params *fps,
+					  int linewidth)
+{
+	int h, i;
+	static struct table_hdr th;
+	int ofs = 0;
+
+	for (i = 0; i < HDR_LINES; i++)
+		th.hdr[i] = calloc(1, HDR_LINE_LENGTH);
+
+	for (i = 0; i < fps->num; i++) {
+		char *cname, *fname = fps->params[i].lf->name;
+		unsigned int width = fps->params[i].print.width;
+
+		snprintf(th.hdr[0]+ofs, width+2, "%*.*s|", width, width,
+			 fps->params[i].lf->file->basename);
+
+		cname = fname;
+		for (h = 1; h < HDR_LINES; h++) {
+			if (cname - fname >= strlen(fname))
+				snprintf(th.hdr[h]+ofs, width+2,
+					 "%*.*s|", width, width, "");
+			else {
+				th.num_lines = h+1;
+				snprintf(th.hdr[h]+ofs, width+2,
+					 "%*.*s|", width, width, cname);
+			}
+			cname += width;
+		}
+		ofs += width+1;
+	}
+
+	/* fill in spaces */
+	for (h = 1; h < th.num_lines; h++) {
+		for (i = 0; i < ofs; i++) {
+			if (th.hdr[h][i] == '\0')
+				th.hdr[h][i] = ' ';
+		}
+	}
+
+	return &th;
+}
+
+static int print_hdr(FILE *of, struct table_hdr *th)
+{
+	int i;
+
+	for (i = 0; i < th->num_lines; i++) {
+		fputs(th->hdr[i], of);
+		fputc('\n', of);
+	}
+	return 0;
+}
+
+
+int main(int argc, char **argv)
+{
+	struct lnstat_file *lnstat_files;
+	const char *basename;
+	int i, c;
+	int interval = DEFAULT_INTERVAL;
+	int hdr = 2;
+	enum {
+		MODE_DUMP,
+		MODE_JSON,
+		MODE_NORMAL,
+	} mode = MODE_NORMAL;
+	unsigned long count = 0;
+	struct table_hdr *header;
+	static struct field_params fp;
+	int num_req_files = 0;
+	char *req_files[LNSTAT_MAX_FILES];
+
+	/* backwards compatibility mode for old tools */
+	basename = strrchr(argv[0], '/');
+	if (basename)
+		basename += 1;	  /* name after slash */
+	else
+		basename = argv[0]; /* no slash */
+
+	if (!strcmp(basename, "rtstat")) {
+		/* rtstat compatibility mode */
+		req_files[0] = "rt_cache";
+		num_req_files = 1;
+	} else if (!strcmp(basename, "ctstat")) {
+		/* ctstat compatibility mode */
+		req_files[0] = "ip_conntrack";
+		num_req_files = 1;
+	}
+
+	while ((c = getopt_long(argc, argv, "Vc:djpf:h?i:k:s:w:",
+				opts, NULL)) != -1) {
+		int len = 0;
+		char *tmp, *tok;
+
+		switch (c) {
+		case 'c':
+			count = strtoul(optarg, NULL, 0);
+			break;
+		case 'd':
+			mode = MODE_DUMP;
+			break;
+		case 'j':
+			mode = MODE_JSON;
+			break;
+		case 'f':
+			req_files[num_req_files++] = strdup(optarg);
+			break;
+		case '?':
+		case 'h':
+			usage(argv[0], 0);
+			break;
+		case 'i':
+			sscanf(optarg, "%u", &interval);
+			break;
+		case 'k':
+			tmp = strdup(optarg);
+			if (!tmp)
+				break;
+			for (tok = strtok(tmp, ",");
+			     tok;
+			     tok = strtok(NULL, ",")) {
+				if (fp.num >= MAX_FIELDS) {
+					fprintf(stderr,
+						"WARN: too many keys requested: (%d max)\n",
+						MAX_FIELDS);
+					break;
+				}
+				fp.params[fp.num++].name = tok;
+			}
+			break;
+		case 's':
+			sscanf(optarg, "%u", &hdr);
+			break;
+		case 'w':
+			tmp = strdup(optarg);
+			if (!tmp)
+				break;
+			i = 0;
+			for (tok = strtok(tmp, ",");
+			     tok;
+			     tok = strtok(NULL, ",")) {
+				len  = strtoul(tok, NULL, 0);
+				if (len > FIELD_WIDTH_MAX)
+					len = FIELD_WIDTH_MAX;
+				fp.params[i].print.width = len;
+				i++;
+			}
+			if (i == 1) {
+				for (i = 0; i < MAX_FIELDS; i++)
+					fp.params[i].print.width = len;
+			}
+			free(tmp);
+			break;
+		default:
+			usage(argv[0], 1);
+			break;
+		}
+	}
+
+	lnstat_files = lnstat_scan_dir(PROC_NET_STAT, num_req_files,
+				       (const char **) req_files);
+
+	switch (mode) {
+	case MODE_DUMP:
+		lnstat_dump(stdout, lnstat_files);
+		break;
+
+	case MODE_NORMAL:
+	case MODE_JSON:
+		if (!map_field_params(lnstat_files, &fp, interval))
+			exit(1);
+
+		header = build_hdr_string(lnstat_files, &fp, 80);
+		if (!header)
+			exit(1);
+
+		if (interval < 1)
+			interval = 1;
+
+		for (i = 0; i < count || !count; i++) {
+			lnstat_update(lnstat_files);
+			if (mode == MODE_JSON)
+				print_json(stdout, lnstat_files, &fp);
+			else {
+				if  ((hdr > 1 && !(i % 20)) ||
+				     (hdr == 1 && i == 0))
+					print_hdr(stdout, header);
+				print_line(stdout, lnstat_files, &fp);
+			}
+			fflush(stdout);
+			if (i < count - 1 || !count)
+				sleep(interval);
+		}
+		break;
+	}
+
+	return 1;
+}
diff --git a/misc/lnstat.h b/misc/lnstat.h
new file mode 100644
index 0000000..433599c
--- /dev/null
+++ b/misc/lnstat.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LNSTAT_H
+#define _LNSTAT_H
+
+#include <limits.h>
+#include <sys/select.h>
+
+#define PROC_NET_STAT	"/proc/net/stat"
+
+#define LNSTAT_MAX_FILES			32
+#define LNSTAT_MAX_FIELDS_PER_LINE		32
+#define LNSTAT_MAX_FIELD_NAME_LEN		32
+
+struct lnstat_file;
+
+struct lnstat_field {
+	struct lnstat_file *file;
+	unsigned int num;			/* field number in line */
+	char name[LNSTAT_MAX_FIELD_NAME_LEN+1];
+	unsigned long values[2];		/* two buffers for values */
+	unsigned long result;
+};
+
+struct lnstat_file {
+	struct lnstat_file *next;
+	char path[PATH_MAX+1];
+	char basename[NAME_MAX+1];
+	struct timeval last_read;		/* last time of read */
+	struct timeval interval;		/* interval */
+	int compat;				/* 1 == backwards compat mode */
+	FILE *fp;
+	unsigned int num_fields;		/* number of fields */
+	struct lnstat_field fields[LNSTAT_MAX_FIELDS_PER_LINE];
+};
+
+
+struct lnstat_file *lnstat_scan_dir(const char *path, const int num_req_files,
+				    const char **req_files);
+int lnstat_update(struct lnstat_file *lnstat_files);
+int lnstat_dump(FILE *outfd, struct lnstat_file *lnstat_files);
+struct lnstat_field *lnstat_find_field(struct lnstat_file *lnstat_files,
+				       const char *name);
+#endif /* _LNSTAT_H */
diff --git a/misc/lnstat_util.c b/misc/lnstat_util.c
new file mode 100644
index 0000000..3f53e91
--- /dev/null
+++ b/misc/lnstat_util.c
@@ -0,0 +1,325 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* lnstat.c:  Unified linux network statistics
+ *
+ * Copyright (C) 2004 by Harald Welte <laforge@gnumonks.org>
+ *
+ * Development of this code was funded by Astaro AG, http://www.astaro.com/
+ *
+ * Based on original concept and ideas from predecessor rtstat.c:
+ *
+ * Copyright 2001 by Robert Olsson <robert.olsson@its.uu.se>
+ *                                 Uppsala University, Sweden
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dirent.h>
+#include <limits.h>
+#include <time.h>
+
+#include <sys/time.h>
+#include <sys/types.h>
+
+#include "lnstat.h"
+
+/* size of temp buffer used to read lines from procfiles */
+#define FGETS_BUF_SIZE 1024
+
+
+#define RTSTAT_COMPAT_LINE "entries  in_hit in_slow_tot in_no_route in_brd in_martian_dst in_martian_src  out_hit out_slow_tot out_slow_mc  gc_total gc_ignored gc_goal_miss gc_dst_overflow in_hlist_search out_hlist_search\n"
+
+/* Read (and summarize for SMP) the different stats vars. */
+static int scan_lines(struct lnstat_file *lf, int i)
+{
+	char buf[FGETS_BUF_SIZE];
+	int j, num_lines = 0;
+
+	for (j = 0; j < lf->num_fields; j++)
+		lf->fields[j].values[i] = 0;
+
+	rewind(lf->fp);
+	/* skip first line */
+	if (!lf->compat && !fgets(buf, sizeof(buf)-1, lf->fp))
+		return -1;
+
+	while (!feof(lf->fp) && fgets(buf, sizeof(buf)-1, lf->fp)) {
+		char *ptr = buf;
+
+		num_lines++;
+
+		gettimeofday(&lf->last_read, NULL);
+
+		for (j = 0; j < lf->num_fields; j++) {
+			unsigned long f = strtoul(ptr, &ptr, 16);
+
+			if (j == 0)
+				lf->fields[j].values[i] = f;
+			else
+				lf->fields[j].values[i] += f;
+		}
+	}
+	return num_lines;
+}
+
+static int time_after(struct timeval *last,
+		      struct timeval *tout,
+		      struct timeval *now)
+{
+	if (now->tv_sec > last->tv_sec + tout->tv_sec)
+		return 1;
+
+	if (now->tv_sec == last->tv_sec + tout->tv_sec) {
+		if (now->tv_usec > last->tv_usec + tout->tv_usec)
+			return 1;
+	}
+
+	return 0;
+}
+
+int lnstat_update(struct lnstat_file *lnstat_files)
+{
+	struct lnstat_file *lf;
+	struct timeval tv;
+
+	gettimeofday(&tv, NULL);
+
+	for (lf = lnstat_files; lf; lf = lf->next) {
+		if (time_after(&lf->last_read, &lf->interval, &tv)) {
+			int i;
+			struct lnstat_field *lfi;
+
+			scan_lines(lf, 1);
+
+			for (i = 0, lfi = &lf->fields[i];
+			     i < lf->num_fields; i++, lfi = &lf->fields[i]) {
+				if (i == 0)
+					lfi->result = lfi->values[1];
+				else
+					lfi->result = (lfi->values[1]-lfi->values[0])
+							/ lf->interval.tv_sec;
+			}
+
+			scan_lines(lf, 0);
+		}
+	}
+
+	return 0;
+}
+
+/* scan first template line and fill in per-field data structures */
+static int __lnstat_scan_fields(struct lnstat_file *lf, char *buf)
+{
+	char *tok;
+	int i;
+
+	tok = strtok(buf, " \t\n");
+	for (i = 0; i < LNSTAT_MAX_FIELDS_PER_LINE; i++) {
+		lf->fields[i].file = lf;
+		strncpy(lf->fields[i].name, tok, LNSTAT_MAX_FIELD_NAME_LEN);
+		/* has to be null-terminate since we initialize to zero
+		 * and field size is NAME_LEN + 1 */
+		tok = strtok(NULL, " \t\n");
+		if (!tok) {
+			lf->num_fields = i+1;
+			return 0;
+		}
+	}
+	return 0;
+}
+
+static int lnstat_scan_fields(struct lnstat_file *lf)
+{
+	char buf[FGETS_BUF_SIZE];
+
+	rewind(lf->fp);
+	if (!fgets(buf, sizeof(buf)-1, lf->fp))
+		return -1;
+
+	return __lnstat_scan_fields(lf, buf);
+}
+
+/* fake function emulating lnstat_scan_fields() for old kernels */
+static int lnstat_scan_compat_rtstat_fields(struct lnstat_file *lf)
+{
+	char buf[FGETS_BUF_SIZE];
+
+	strncpy(buf, RTSTAT_COMPAT_LINE, sizeof(buf) - 1);
+	buf[sizeof(buf) - 1] = '\0';
+
+	return __lnstat_scan_fields(lf, buf);
+}
+
+/* find out whether string 'name; is in given string array */
+static int name_in_array(const int num, const char **arr, const char *name)
+{
+	int i;
+
+	for (i = 0; i < num; i++) {
+		if (!strcmp(arr[i], name))
+			return 1;
+	}
+	return 0;
+}
+
+/* allocate lnstat_file and open given file */
+static struct lnstat_file *alloc_and_open(const char *path, const char *file)
+{
+	struct lnstat_file *lf;
+
+	/* allocate */
+	lf = calloc(1, sizeof(*lf));
+	if (!lf) {
+		fprintf(stderr, "out of memory\n");
+		return NULL;
+	}
+
+	/* initialize */
+	snprintf(lf->basename, sizeof(lf->basename), "%s", file);
+	snprintf(lf->path, sizeof(lf->path), "%s/%s", path, file);
+
+	/* initialize to default */
+	lf->interval.tv_sec = 1;
+
+	/* open */
+	lf->fp = fopen(lf->path, "r");
+	if (!lf->fp) {
+		perror(lf->path);
+		free(lf);
+		return NULL;
+	}
+
+	return lf;
+}
+
+
+/* lnstat_scan_dir - find and parse all available statistics files/fields */
+struct lnstat_file *lnstat_scan_dir(const char *path, const int num_req_files,
+				    const char **req_files)
+{
+	DIR *dir;
+	struct lnstat_file *lnstat_files = NULL;
+	struct dirent *de;
+
+	if (!path)
+		path = PROC_NET_STAT;
+
+	dir = opendir(path);
+	if (!dir) {
+		struct lnstat_file *lf;
+		/* Old kernel, before /proc/net/stat was introduced */
+		fprintf(stderr, "Your kernel doesn't have lnstat support. ");
+
+		/* we only support rtstat, not multiple files */
+		if (num_req_files >= 2) {
+			fputc('\n', stderr);
+			return NULL;
+		}
+
+		/* we really only accept rt_cache */
+		if (num_req_files && !name_in_array(num_req_files,
+						    req_files, "rt_cache")) {
+			fputc('\n', stderr);
+			return NULL;
+		}
+
+		fprintf(stderr, "Fallback to old rtstat-only operation\n");
+
+		lf = alloc_and_open("/proc/net", "rt_cache_stat");
+		if (!lf)
+			return NULL;
+		lf->compat = 1;
+		strncpy(lf->basename, "rt_cache", sizeof(lf->basename));
+
+		/* FIXME: support for old files */
+		if (lnstat_scan_compat_rtstat_fields(lf) < 0)
+			return NULL;
+
+		lf->next = lnstat_files;
+		lnstat_files = lf;
+		return lnstat_files;
+	}
+
+	while ((de = readdir(dir))) {
+		struct lnstat_file *lf;
+
+		if (de->d_type != DT_REG)
+			continue;
+
+		if (num_req_files && !name_in_array(num_req_files,
+						    req_files, de->d_name))
+			continue;
+
+		lf = alloc_and_open(path, de->d_name);
+		if (!lf) {
+			closedir(dir);
+			return NULL;
+		}
+
+		/* fill in field structure */
+		if (lnstat_scan_fields(lf) < 0) {
+			closedir(dir);
+			return NULL;
+		}
+
+		/* prepend to global list */
+		lf->next = lnstat_files;
+		lnstat_files = lf;
+	}
+	closedir(dir);
+
+	return lnstat_files;
+}
+
+int lnstat_dump(FILE *outfd, struct lnstat_file *lnstat_files)
+{
+	struct lnstat_file *lf;
+
+	for (lf = lnstat_files; lf; lf = lf->next) {
+		int i;
+
+		fprintf(outfd, "%s:\n", lf->path);
+
+		for (i = 0; i < lf->num_fields; i++)
+			fprintf(outfd, "\t%2u: %s\n", i+1, lf->fields[i].name);
+
+	}
+	return 0;
+}
+
+struct lnstat_field *lnstat_find_field(struct lnstat_file *lnstat_files,
+				       const char *name)
+{
+	struct lnstat_file *lf;
+	struct lnstat_field *ret = NULL;
+	const char *colon = strchr(name, ':');
+	char *file;
+	const char *field;
+
+	if (colon) {
+		file = strndup(name, colon-name);
+		field = colon+1;
+	} else {
+		file = NULL;
+		field = name;
+	}
+
+	for (lf = lnstat_files; lf; lf = lf->next) {
+		int i;
+
+		if (file && strcmp(file, lf->basename))
+			continue;
+
+		for (i = 0; i < lf->num_fields; i++) {
+			if (!strcmp(field, lf->fields[i].name)) {
+				ret = &lf->fields[i];
+				goto out;
+			}
+		}
+	}
+out:
+	free(file);
+
+	return ret;
+}
diff --git a/misc/nstat.c b/misc/nstat.c
new file mode 100644
index 0000000..2c10fea
--- /dev/null
+++ b/misc/nstat.c
@@ -0,0 +1,776 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * nstat.c	handy utility to read counters /proc/net/netstat and snmp
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+#include <sys/time.h>
+#include <fnmatch.h>
+#include <sys/file.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/poll.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <signal.h>
+#include <math.h>
+#include <getopt.h>
+
+#include <json_writer.h>
+#include "version.h"
+#include "utils.h"
+
+int dump_zeros;
+int reset_history;
+int ignore_history;
+int no_output;
+int json_output;
+int no_update;
+int scan_interval;
+int time_constant;
+double W;
+char **patterns;
+int npatterns;
+
+char info_source[128];
+int source_mismatch;
+
+static int generic_proc_open(const char *env, char *name)
+{
+	char store[128];
+	char *p = getenv(env);
+
+	if (!p) {
+		p = getenv("PROC_ROOT") ? : "/proc";
+		snprintf(store, sizeof(store)-1, "%s/%s", p, name);
+		p = store;
+	}
+	return open(p, O_RDONLY);
+}
+
+static int net_netstat_open(void)
+{
+	return generic_proc_open("PROC_NET_NETSTAT", "net/netstat");
+}
+
+static int net_snmp_open(void)
+{
+	return generic_proc_open("PROC_NET_SNMP", "net/snmp");
+}
+
+static int net_snmp6_open(void)
+{
+	return generic_proc_open("PROC_NET_SNMP6", "net/snmp6");
+}
+
+static int net_sctp_snmp_open(void)
+{
+	return generic_proc_open("PROC_NET_SCTP_SNMP", "net/sctp/snmp");
+}
+
+struct nstat_ent {
+	struct nstat_ent *next;
+	char		 *id;
+	unsigned long long val;
+	double		   rate;
+};
+
+struct nstat_ent *kern_db;
+struct nstat_ent *hist_db;
+
+static const char *useless_numbers[] = {
+	"IpForwarding", "IpDefaultTTL",
+	"TcpRtoAlgorithm", "TcpRtoMin", "TcpRtoMax",
+	"TcpMaxConn", "TcpCurrEstab"
+};
+
+static int useless_number(const char *id)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(useless_numbers); i++)
+		if (strcmp(id, useless_numbers[i]) == 0)
+			return 1;
+	return 0;
+}
+
+static int match(const char *id)
+{
+	int i;
+
+	if (npatterns == 0)
+		return 1;
+
+	for (i = 0; i < npatterns; i++) {
+		if (!fnmatch(patterns[i], id, FNM_CASEFOLD))
+			return 1;
+	}
+	return 0;
+}
+
+static void load_good_table(FILE *fp)
+{
+	char buf[4096];
+	struct nstat_ent *db = NULL;
+	struct nstat_ent *n;
+
+	while (fgets(buf, sizeof(buf), fp) != NULL) {
+		int nr;
+		unsigned long long val;
+		double rate;
+		char idbuf[sizeof(buf)];
+
+		if (buf[0] == '#') {
+			buf[strlen(buf)-1] = 0;
+			if (info_source[0] && strcmp(info_source, buf+1))
+				source_mismatch = 1;
+			strlcpy(info_source, buf + 1, sizeof(info_source));
+			continue;
+		}
+		/* idbuf is as big as buf, so this is safe */
+		nr = sscanf(buf, "%s%llu%lg", idbuf, &val, &rate);
+		if (nr < 2) {
+			fprintf(stderr, "%s:%d: error parsing history file\n",
+				__FILE__, __LINE__);
+			exit(-2);
+		}
+		if (nr < 3)
+			rate = 0;
+		if (useless_number(idbuf))
+			continue;
+		if ((n = malloc(sizeof(*n))) == NULL) {
+			perror("nstat: malloc");
+			exit(-1);
+		}
+		n->id = strdup(idbuf);
+		n->val = val;
+		n->rate = rate;
+		n->next = db;
+		db = n;
+	}
+
+	while (db) {
+		n = db;
+		db = db->next;
+		n->next = kern_db;
+		kern_db = n;
+	}
+}
+
+static int count_spaces(const char *line)
+{
+	int count = 0;
+	char c;
+
+	while ((c = *line++) != 0)
+		count += c == ' ' || c == '\n';
+	return count;
+}
+
+static void load_ugly_table(FILE *fp)
+{
+	char *buf = NULL;
+	size_t buflen = 0;
+	ssize_t nread;
+	struct nstat_ent *db = NULL;
+	struct nstat_ent *n;
+
+	while ((nread = getline(&buf, &buflen, fp)) != -1) {
+		char idbuf[4096];
+		int  off;
+		char *p;
+		int count1, count2, skip = 0;
+
+		p = strchr(buf, ':');
+		if (!p) {
+			fprintf(stderr, "%s:%d: error parsing history file\n",
+				__FILE__, __LINE__);
+			exit(-2);
+		}
+		count1 = count_spaces(buf);
+		*p = 0;
+		idbuf[0] = 0;
+		strncat(idbuf, buf, sizeof(idbuf) - 1);
+		off = p - buf;
+		p += 2;
+
+		while (*p) {
+			char *next;
+
+			if ((next = strchr(p, ' ')) != NULL)
+				*next++ = 0;
+			else if ((next = strchr(p, '\n')) != NULL)
+				*next++ = 0;
+			if (off < sizeof(idbuf)) {
+				idbuf[off] = 0;
+				strncat(idbuf, p, sizeof(idbuf) - off - 1);
+			}
+			n = malloc(sizeof(*n));
+			if (!n) {
+				perror("nstat: malloc");
+				exit(-1);
+			}
+			n->id = strdup(idbuf);
+			if (n->id == NULL) {
+				perror("nstat: strdup");
+				exit(-1);
+			}
+			n->rate = 0;
+			n->next = db;
+			db = n;
+			if (next == NULL)
+				break;
+			p = next;
+		}
+		n = db;
+		nread = getline(&buf, &buflen, fp);
+		if (nread == -1) {
+			fprintf(stderr, "%s:%d: error parsing history file\n",
+				__FILE__, __LINE__);
+			exit(-2);
+		}
+		count2 = count_spaces(buf);
+		if (count2 > count1)
+			skip = count2 - count1;
+		do {
+			p = strrchr(buf, ' ');
+			if (!p) {
+				fprintf(stderr, "%s:%d: error parsing history file\n",
+					__FILE__, __LINE__);
+				exit(-2);
+			}
+			*p = 0;
+			if (sscanf(p+1, "%llu", &n->val) != 1) {
+				fprintf(stderr, "%s:%d: error parsing history file\n",
+					__FILE__, __LINE__);
+				exit(-2);
+			}
+			/* Trick to skip "dummy" trailing ICMP MIB in 2.4 */
+			if (skip)
+				skip--;
+			else
+				n = n->next;
+		} while (p > buf + off + 2);
+	}
+	free(buf);
+
+	while (db) {
+		n = db;
+		db = db->next;
+		if (useless_number(n->id)) {
+			free(n->id);
+			free(n);
+		} else {
+			n->next = kern_db;
+			kern_db = n;
+		}
+	}
+}
+
+static void load_sctp_snmp(void)
+{
+	FILE *fp = fdopen(net_sctp_snmp_open(), "r");
+
+	if (fp) {
+		load_good_table(fp);
+		fclose(fp);
+	}
+}
+
+static void load_snmp(void)
+{
+	FILE *fp = fdopen(net_snmp_open(), "r");
+
+	if (fp) {
+		load_ugly_table(fp);
+		fclose(fp);
+	}
+}
+
+static void load_snmp6(void)
+{
+	FILE *fp = fdopen(net_snmp6_open(), "r");
+
+	if (fp) {
+		load_good_table(fp);
+		fclose(fp);
+	}
+}
+
+static void load_netstat(void)
+{
+	FILE *fp = fdopen(net_netstat_open(), "r");
+
+	if (fp) {
+		load_ugly_table(fp);
+		fclose(fp);
+	}
+}
+
+
+static void dump_kern_db(FILE *fp, int to_hist)
+{
+	json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
+	struct nstat_ent *n, *h;
+
+	h = hist_db;
+	if (jw) {
+		jsonw_start_object(jw);
+		jsonw_pretty(jw, pretty);
+		jsonw_name(jw, info_source);
+		jsonw_start_object(jw);
+	} else
+		fprintf(fp, "#%s\n", info_source);
+
+	for (n = kern_db; n; n = n->next) {
+		unsigned long long val = n->val;
+
+		if (!dump_zeros && !val && !n->rate)
+			continue;
+		if (!match(n->id)) {
+			struct nstat_ent *h1;
+
+			if (!to_hist)
+				continue;
+			for (h1 = h; h1; h1 = h1->next) {
+				if (strcmp(h1->id, n->id) == 0) {
+					val = h1->val;
+					h = h1->next;
+					break;
+				}
+			}
+		}
+
+		if (jw)
+			jsonw_uint_field(jw, n->id, val);
+		else
+			fprintf(fp, "%-32s%-16llu%6.1f\n", n->id, val, n->rate);
+	}
+
+	if (jw) {
+		jsonw_end_object(jw);
+
+		jsonw_end_object(jw);
+		jsonw_destroy(&jw);
+	}
+}
+
+static void dump_incr_db(FILE *fp)
+{
+	json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
+	struct nstat_ent *n, *h;
+
+	h = hist_db;
+	if (jw) {
+		jsonw_start_object(jw);
+		jsonw_pretty(jw, pretty);
+		jsonw_name(jw, info_source);
+		jsonw_start_object(jw);
+	} else
+		fprintf(fp, "#%s\n", info_source);
+
+	for (n = kern_db; n; n = n->next) {
+		int ovfl = 0;
+		unsigned long long val = n->val;
+		struct nstat_ent *h1;
+
+		for (h1 = h; h1; h1 = h1->next) {
+			if (strcmp(h1->id, n->id) == 0) {
+				if (val < h1->val) {
+					ovfl = 1;
+					val = h1->val;
+				}
+				val -= h1->val;
+				h = h1->next;
+				break;
+			}
+		}
+		if (!dump_zeros && !val && !n->rate)
+			continue;
+		if (!match(n->id))
+			continue;
+
+		if (jw)
+			jsonw_uint_field(jw, n->id, val);
+		else
+			fprintf(fp, "%-32s%-16llu%6.1f%s\n", n->id, val,
+				n->rate, ovfl?" (overflow)":"");
+	}
+
+	if (jw) {
+		jsonw_end_object(jw);
+
+		jsonw_end_object(jw);
+		jsonw_destroy(&jw);
+	}
+}
+
+static int children;
+
+static void sigchild(int signo)
+{
+}
+
+static void update_db(int interval)
+{
+	struct nstat_ent *n, *h;
+
+	n = kern_db;
+	kern_db = NULL;
+
+	load_netstat();
+	load_snmp6();
+	load_snmp();
+	load_sctp_snmp();
+
+	h = kern_db;
+	kern_db = n;
+
+	for (n = kern_db; n; n = n->next) {
+		struct nstat_ent *h1;
+
+		for (h1 = h; h1; h1 = h1->next) {
+			if (strcmp(h1->id, n->id) == 0) {
+				double sample;
+				unsigned long long incr = h1->val - n->val;
+
+				n->val = h1->val;
+				sample = (double)incr * 1000.0 / interval;
+				if (interval >= scan_interval) {
+					n->rate += W*(sample-n->rate);
+				} else if (interval >= 1000) {
+					if (interval >= time_constant) {
+						n->rate = sample;
+					} else {
+						double w = W*(double)interval/scan_interval;
+
+						n->rate += w*(sample-n->rate);
+					}
+				}
+
+				while (h != h1) {
+					struct nstat_ent *tmp = h;
+
+					h = h->next;
+					free(tmp->id);
+					free(tmp);
+				};
+				h = h1->next;
+				free(h1->id);
+				free(h1);
+				break;
+			}
+		}
+	}
+}
+
+#define T_DIFF(a, b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
+
+
+static void server_loop(int fd)
+{
+	struct timeval snaptime = { 0 };
+	struct pollfd p;
+
+	p.fd = fd;
+	p.events = p.revents = POLLIN;
+
+	sprintf(info_source, "%d.%lu sampling_interval=%d time_const=%d",
+		getpid(), (unsigned long)random(), scan_interval/1000, time_constant/1000);
+
+	load_netstat();
+	load_snmp6();
+	load_snmp();
+	load_sctp_snmp();
+
+	for (;;) {
+		int status;
+		time_t tdiff;
+		struct timeval now;
+
+		gettimeofday(&now, NULL);
+		tdiff = T_DIFF(now, snaptime);
+		if (tdiff >= scan_interval) {
+			update_db(tdiff);
+			snaptime = now;
+			tdiff = 0;
+		}
+		if (poll(&p, 1, scan_interval - tdiff) > 0
+		    && (p.revents&POLLIN)) {
+			int clnt = accept(fd, NULL, NULL);
+
+			if (clnt >= 0) {
+				pid_t pid;
+
+				if (children >= 5) {
+					close(clnt);
+				} else if ((pid = fork()) != 0) {
+					if (pid > 0)
+						children++;
+					close(clnt);
+				} else {
+					FILE *fp = fdopen(clnt, "w");
+
+					if (fp)
+						dump_kern_db(fp, 0);
+					exit(0);
+				}
+			}
+		}
+		while (children && waitpid(-1, &status, WNOHANG) > 0)
+			children--;
+	}
+}
+
+static int verify_forging(int fd)
+{
+	struct ucred cred;
+	socklen_t olen = sizeof(cred);
+
+	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &olen) ||
+	    olen < sizeof(cred))
+		return -1;
+	if (cred.uid == getuid() || cred.uid == 0)
+		return 0;
+	return -1;
+}
+
+static void usage(void) __attribute__((noreturn));
+
+static void usage(void)
+{
+	fprintf(stderr,
+		"Usage: nstat [OPTION] [ PATTERN [ PATTERN ] ]\n"
+		"   -h, --help          this message\n"
+		"   -a, --ignore        ignore history\n"
+		"   -d, --scan=SECS     sample every statistics every SECS\n"
+		"   -j, --json          format output in JSON\n"
+		"   -n, --nooutput      do history only\n"
+		"   -p, --pretty        pretty print\n"
+		"   -r, --reset         reset history\n"
+		"   -s, --noupdate      don't update history\n"
+		"   -t, --interval=SECS report average over the last SECS\n"
+		"   -V, --version       output version information\n"
+		"   -z, --zeros         show entries with zero activity\n");
+	exit(-1);
+}
+
+static const struct option longopts[] = {
+	{ "help", 0, 0, 'h' },
+	{ "ignore",  0,  0, 'a' },
+	{ "scan", 1, 0, 'd'},
+	{ "nooutput", 0, 0, 'n' },
+	{ "json", 0, 0, 'j' },
+	{ "reset", 0, 0, 'r' },
+	{ "noupdate", 0, 0, 's' },
+	{ "pretty", 0, 0, 'p' },
+	{ "interval", 1, 0, 't' },
+	{ "version", 0, 0, 'V' },
+	{ "zeros", 0, 0, 'z' },
+	{ 0 }
+};
+
+int main(int argc, char *argv[])
+{
+	char *hist_name;
+	struct sockaddr_un sun;
+	FILE *hist_fp = NULL;
+	int ch;
+	int fd;
+
+	while ((ch = getopt_long(argc, argv, "h?vVzrnasd:t:jp",
+				 longopts, NULL)) != EOF) {
+		switch (ch) {
+		case 'z':
+			dump_zeros = 1;
+			break;
+		case 'r':
+			reset_history = 1;
+			break;
+		case 'a':
+			ignore_history = 1;
+			break;
+		case 's':
+			no_update = 1;
+			break;
+		case 'n':
+			no_output = 1;
+			break;
+		case 'd':
+			scan_interval = 1000*atoi(optarg);
+			break;
+		case 't':
+			if (sscanf(optarg, "%d", &time_constant) != 1 ||
+			    time_constant <= 0) {
+				fprintf(stderr, "nstat: invalid time constant divisor\n");
+				exit(-1);
+			}
+			break;
+		case 'j':
+			json_output = 1;
+			break;
+		case 'p':
+			pretty = 1;
+			break;
+		case 'v':
+		case 'V':
+			printf("nstat utility, iproute2-%s\n", version);
+			exit(0);
+		case 'h':
+		case '?':
+		default:
+			usage();
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	sun.sun_family = AF_UNIX;
+	sun.sun_path[0] = 0;
+	sprintf(sun.sun_path+1, "nstat%d", getuid());
+
+	if (scan_interval > 0) {
+		if (time_constant == 0)
+			time_constant = 60;
+		time_constant *= 1000;
+		W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
+		if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
+			perror("nstat: socket");
+			exit(-1);
+		}
+		if (bind(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
+			perror("nstat: bind");
+			exit(-1);
+		}
+		if (listen(fd, 5) < 0) {
+			perror("nstat: listen");
+			exit(-1);
+		}
+		if (daemon(0, 0)) {
+			perror("nstat: daemon");
+			exit(-1);
+		}
+		signal(SIGPIPE, SIG_IGN);
+		signal(SIGCHLD, sigchild);
+		server_loop(fd);
+		exit(0);
+	}
+
+	patterns = argv;
+	npatterns = argc;
+
+	if ((hist_name = getenv("NSTAT_HISTORY")) == NULL) {
+		hist_name = malloc(128);
+		sprintf(hist_name, "/tmp/.nstat.u%d", getuid());
+	}
+
+	if (reset_history)
+		unlink(hist_name);
+
+	if (!ignore_history || !no_update) {
+		struct stat stb;
+
+		fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600);
+		if (fd < 0) {
+			perror("nstat: open history file");
+			exit(-1);
+		}
+		if ((hist_fp = fdopen(fd, "r+")) == NULL) {
+			perror("nstat: fdopen history file");
+			exit(-1);
+		}
+		if (flock(fileno(hist_fp), LOCK_EX)) {
+			perror("nstat: flock history file");
+			exit(-1);
+		}
+		if (fstat(fileno(hist_fp), &stb) != 0) {
+			perror("nstat: fstat history file");
+			exit(-1);
+		}
+		if (stb.st_nlink != 1 || stb.st_uid != getuid()) {
+			fprintf(stderr, "nstat: something is so wrong with history file, that I prefer not to proceed.\n");
+			exit(-1);
+		}
+		if (!ignore_history) {
+			FILE *tfp;
+			long uptime = -1;
+
+			if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
+				if (fscanf(tfp, "%ld", &uptime) != 1)
+					uptime = -1;
+				fclose(tfp);
+			}
+			if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
+				fprintf(stderr, "nstat: history is aged out, resetting\n");
+				if (ftruncate(fileno(hist_fp), 0) < 0)
+					perror("nstat: ftruncate");
+			}
+		}
+
+		load_good_table(hist_fp);
+
+		hist_db = kern_db;
+		kern_db = NULL;
+	}
+
+	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
+	    (connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0
+	     || (strcpy(sun.sun_path+1, "nstat0"),
+		 connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
+	    && verify_forging(fd) == 0) {
+		FILE *sfp = fdopen(fd, "r");
+
+		if (!sfp) {
+			fprintf(stderr, "nstat: fdopen failed: %s\n",
+				strerror(errno));
+			close(fd);
+		} else {
+			load_good_table(sfp);
+			if (hist_db && source_mismatch) {
+				fprintf(stderr, "nstat: history is stale, ignoring it.\n");
+				hist_db = NULL;
+			}
+			fclose(sfp);
+		}
+	} else {
+		if (fd >= 0)
+			close(fd);
+		if (hist_db && info_source[0] && strcmp(info_source, "kernel")) {
+			fprintf(stderr, "nstat: history is stale, ignoring it.\n");
+			hist_db = NULL;
+			info_source[0] = 0;
+		}
+		load_netstat();
+		load_snmp6();
+		load_snmp();
+		load_sctp_snmp();
+		if (info_source[0] == 0)
+			strcpy(info_source, "kernel");
+	}
+
+	if (!no_output) {
+		if (ignore_history || hist_db == NULL)
+			dump_kern_db(stdout, 0);
+		else
+			dump_incr_db(stdout);
+	}
+	if (!no_update) {
+		if (ftruncate(fileno(hist_fp), 0) < 0)
+			perror("nstat: ftruncate");
+		rewind(hist_fp);
+
+		json_output = 0;
+		dump_kern_db(hist_fp, 1);
+		fclose(hist_fp);
+	}
+	exit(0);
+}
diff --git a/misc/rtacct.c b/misc/rtacct.c
new file mode 100644
index 0000000..08363bf
--- /dev/null
+++ b/misc/rtacct.c
@@ -0,0 +1,622 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * rtacct.c		Applet to display contents of /proc/net/rt_acct.
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+#include <sys/time.h>
+#include <sys/file.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/poll.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <signal.h>
+#include <math.h>
+
+#include "rt_names.h"
+
+#include "version.h"
+
+int reset_history;
+int ignore_history;
+int no_output;
+int no_update;
+int scan_interval;
+int time_constant;
+int dump_zeros;
+unsigned long magic_number;
+double W;
+
+static int generic_proc_open(const char *env, const char *name)
+{
+	char store[1024];
+	char *p = getenv(env);
+
+	if (!p) {
+		p = getenv("PROC_ROOT") ? : "/proc";
+		snprintf(store, sizeof(store)-1, "%s/%s", p, name);
+		p = store;
+	}
+	return open(p, O_RDONLY);
+}
+
+static int net_rtacct_open(void)
+{
+	return generic_proc_open("PROC_NET_RTACCT", "net/rt_acct");
+}
+
+static __u32 rmap[256/4];
+
+struct rtacct_data {
+	__u32			ival[256*4];
+
+	unsigned long long	val[256*4];
+	double			rate[256*4];
+	char			signature[128];
+};
+
+static struct rtacct_data kern_db_static;
+
+static struct rtacct_data *kern_db = &kern_db_static;
+static struct rtacct_data *hist_db;
+
+static void nread(int fd, char *buf, int tot)
+{
+	int count = 0;
+
+	while (count < tot) {
+		int n = read(fd, buf+count, tot-count);
+
+		if (n < 0) {
+			if (errno == EINTR)
+				continue;
+			exit(-1);
+		}
+		if (n == 0)
+			exit(-1);
+		count += n;
+	}
+}
+
+static __u32 *read_kern_table(__u32 *tbl)
+{
+	static __u32 *tbl_ptr;
+	int fd;
+
+	if (magic_number) {
+		if (tbl_ptr != NULL)
+			return tbl_ptr;
+
+		fd = open("/dev/mem", O_RDONLY);
+		if (fd < 0) {
+			perror("magic open");
+			exit(-1);
+		}
+		tbl_ptr = mmap(NULL, 4096,
+			       PROT_READ,
+			       MAP_SHARED,
+			       fd, magic_number);
+		if ((unsigned long)tbl_ptr == ~0UL) {
+			perror("magic mmap");
+			exit(-1);
+		}
+		close(fd);
+		return tbl_ptr;
+	}
+
+	fd = net_rtacct_open();
+	if (fd >= 0) {
+		nread(fd, (char *)tbl, 256*16);
+		close(fd);
+	} else {
+		memset(tbl, 0, 256*16);
+	}
+	return tbl;
+}
+
+static void format_rate(FILE *fp, double rate)
+{
+	char temp[64];
+
+	if (rate > 1024*1024) {
+		sprintf(temp, "%uM", (unsigned int)rint(rate/(1024*1024)));
+		fprintf(fp, " %-10s", temp);
+	} else if (rate > 1024) {
+		sprintf(temp, "%uK", (unsigned int)rint(rate/1024));
+		fprintf(fp, " %-10s", temp);
+	} else
+		fprintf(fp, " %-10u", (unsigned int)rate);
+}
+
+static void format_count(FILE *fp, unsigned long long val)
+{
+	if (val > 1024*1024*1024)
+		fprintf(fp, " %10lluM", val/(1024*1024));
+	else if (val > 1024*1024)
+		fprintf(fp, " %10lluK", val/1024);
+	else
+		fprintf(fp, " %10llu", val);
+}
+
+static void dump_abs_db(FILE *fp)
+{
+	int realm;
+	char b1[16];
+
+	if (!no_output) {
+		fprintf(fp, "#%s\n", kern_db->signature);
+		fprintf(fp,
+"%-10s %-10s "
+"%-10s %-10s "
+"%-10s \n"
+		       , "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
+		fprintf(fp,
+"%-10s %-10s "
+"%-10s %-10s "
+"%-10s \n"
+		       , "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
+
+	}
+
+	for (realm = 0; realm < 256; realm++) {
+		int i;
+		unsigned long long *val;
+		double		   *rate;
+
+		if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
+			continue;
+
+		val = &kern_db->val[realm*4];
+		rate = &kern_db->rate[realm*4];
+
+		if (!dump_zeros &&
+		    !val[0] && !rate[0] &&
+		    !val[1] && !rate[1] &&
+		    !val[2] && !rate[2] &&
+		    !val[3] && !rate[3])
+			continue;
+
+		if (hist_db) {
+			memcpy(&hist_db->val[realm*4], val, sizeof(*val)*4);
+		}
+
+		if (no_output)
+			continue;
+
+		fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
+		for (i = 0; i < 4; i++)
+			format_count(fp, val[i]);
+		fprintf(fp, "\n%-10s", "");
+		for (i = 0; i < 4; i++)
+			format_rate(fp, rate[i]);
+		fprintf(fp, "\n");
+	}
+}
+
+
+static void dump_incr_db(FILE *fp)
+{
+	int k, realm;
+	char b1[16];
+
+	if (!no_output) {
+		fprintf(fp, "#%s\n", kern_db->signature);
+		fprintf(fp,
+"%-10s %-10s "
+"%-10s %-10s "
+"%-10s \n"
+		       , "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
+		fprintf(fp,
+"%-10s %-10s "
+"%-10s %-10s "
+"%-10s \n"
+		       , "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
+	}
+
+	for (realm = 0; realm < 256; realm++) {
+		int ovfl = 0;
+		int i;
+		unsigned long long *val;
+		double		   *rate;
+		unsigned long long rval[4];
+
+		if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
+			continue;
+
+		val = &kern_db->val[realm*4];
+		rate = &kern_db->rate[realm*4];
+
+		for (k = 0; k < 4; k++) {
+			rval[k] = val[k];
+			if (rval[k] < hist_db->val[realm*4+k])
+				ovfl = 1;
+			else
+				rval[k] -= hist_db->val[realm*4+k];
+		}
+		if (ovfl) {
+			for (k = 0; k < 4; k++)
+				rval[k] = val[k];
+		}
+		if (hist_db) {
+			memcpy(&hist_db->val[realm*4], val, sizeof(*val)*4);
+		}
+
+		if (no_output)
+			continue;
+
+		if (!dump_zeros &&
+		    !rval[0] && !rate[0] &&
+		    !rval[1] && !rate[1] &&
+		    !rval[2] && !rate[2] &&
+		    !rval[3] && !rate[3])
+			continue;
+
+
+		fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
+		for (i = 0; i < 4; i++)
+			format_count(fp, rval[i]);
+		fprintf(fp, "\n%-10s", "");
+		for (i = 0; i < 4; i++)
+			format_rate(fp, rate[i]);
+		fprintf(fp, "\n");
+	}
+}
+
+
+static int children;
+
+static void sigchild(int signo)
+{
+}
+
+/* Server side only: read kernel data, update tables, calculate rates. */
+
+static void update_db(int interval)
+{
+	int i;
+	__u32 *ival;
+	__u32 _ival[256*4];
+
+	ival = read_kern_table(_ival);
+
+	for (i = 0; i < 256*4; i++) {
+		double sample;
+		__u32 incr = ival[i] - kern_db->ival[i];
+
+		if (ival[i] == 0 && incr == 0 &&
+		    kern_db->val[i] == 0 && kern_db->rate[i] == 0)
+			continue;
+
+		kern_db->val[i] += incr;
+		kern_db->ival[i] = ival[i];
+		sample = (double)(incr*1000)/interval;
+		if (interval >= scan_interval) {
+			kern_db->rate[i] += W*(sample-kern_db->rate[i]);
+		} else if (interval >= 1000) {
+			if (interval >= time_constant) {
+				kern_db->rate[i] = sample;
+			} else {
+				double w = W*(double)interval/scan_interval;
+
+				kern_db->rate[i] += w*(sample-kern_db->rate[i]);
+			}
+		}
+	}
+}
+
+static void send_db(int fd)
+{
+	int tot = 0;
+
+	while (tot < sizeof(*kern_db)) {
+		int n = write(fd, ((char *)kern_db) + tot, sizeof(*kern_db)-tot);
+
+		if (n < 0) {
+			if (errno == EINTR)
+				continue;
+			return;
+		}
+		tot += n;
+	}
+}
+
+
+
+#define T_DIFF(a, b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
+
+
+static void pad_kern_table(struct rtacct_data *dat, __u32 *ival)
+{
+	int i;
+
+	memset(dat->rate, 0, sizeof(dat->rate));
+	if (dat->ival != ival)
+		memcpy(dat->ival, ival, sizeof(dat->ival));
+	for (i = 0; i < 256*4; i++)
+		dat->val[i] = ival[i];
+}
+
+static void server_loop(int fd)
+{
+	struct timeval snaptime = { 0 };
+	struct pollfd p;
+
+	p.fd = fd;
+	p.events = p.revents = POLLIN;
+
+	sprintf(kern_db->signature,
+		"%u.%lu sampling_interval=%d time_const=%d",
+		(unsigned int) getpid(), (unsigned long)random(),
+		scan_interval/1000, time_constant/1000);
+
+	pad_kern_table(kern_db, read_kern_table(kern_db->ival));
+
+	for (;;) {
+		int status;
+		int tdiff;
+		struct timeval now;
+
+		gettimeofday(&now, NULL);
+		tdiff = T_DIFF(now, snaptime);
+		if (tdiff >= scan_interval) {
+			update_db(tdiff);
+			snaptime = now;
+			tdiff = 0;
+		}
+		if (poll(&p, 1, tdiff + scan_interval) > 0
+		    && (p.revents&POLLIN)) {
+			int clnt = accept(fd, NULL, NULL);
+
+			if (clnt >= 0) {
+				pid_t pid;
+
+				if (children >= 5) {
+					close(clnt);
+				} else if ((pid = fork()) != 0) {
+					if (pid > 0)
+						children++;
+					close(clnt);
+				} else {
+					if (tdiff > 0)
+						update_db(tdiff);
+					send_db(clnt);
+					exit(0);
+				}
+			}
+		}
+		while (children && waitpid(-1, &status, WNOHANG) > 0)
+			children--;
+	}
+}
+
+static int verify_forging(int fd)
+{
+	struct ucred cred;
+	socklen_t olen = sizeof(cred);
+
+	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &olen) ||
+	    olen < sizeof(cred))
+		return -1;
+	if (cred.uid == getuid() || cred.uid == 0)
+		return 0;
+	return -1;
+}
+
+static void usage(void) __attribute__((noreturn));
+
+static void usage(void)
+{
+	fprintf(stderr,
+"Usage: rtacct [ -h?vVzrnasd:t: ] [ ListOfRealms ]\n"
+		);
+	exit(-1);
+}
+
+int main(int argc, char *argv[])
+{
+	char hist_name[128];
+	struct sockaddr_un sun;
+	int ch;
+	int fd;
+
+	while ((ch = getopt(argc, argv, "h?vVzrM:nasd:t:")) != EOF) {
+		switch (ch) {
+		case 'z':
+			dump_zeros = 1;
+			break;
+		case 'r':
+			reset_history = 1;
+			break;
+		case 'a':
+			ignore_history = 1;
+			break;
+		case 's':
+			no_update = 1;
+			break;
+		case 'n':
+			no_output = 1;
+			break;
+		case 'd':
+			scan_interval = 1000*atoi(optarg);
+			break;
+		case 't':
+			if (sscanf(optarg, "%d", &time_constant) != 1 ||
+			    time_constant <= 0) {
+				fprintf(stderr, "rtacct: invalid time constant divisor\n");
+				exit(-1);
+			}
+			break;
+		case 'v':
+		case 'V':
+			printf("rtacct utility, iproute2-%s\n", version);
+			exit(0);
+		case 'M':
+			/* Some secret undocumented option, nobody
+			 * is expected to ask about its sense. See?
+			 */
+			sscanf(optarg, "%lx", &magic_number);
+			break;
+		case 'h':
+		case '?':
+		default:
+			usage();
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	if (argc) {
+		while (argc > 0) {
+			__u32 realm;
+
+			if (rtnl_rtrealm_a2n(&realm, argv[0])) {
+				fprintf(stderr, "Warning: realm \"%s\" does not exist.\n", argv[0]);
+				exit(-1);
+			}
+			rmap[realm>>5] |= (1<<(realm&0x1f));
+			argc--; argv++;
+		}
+	} else {
+		memset(rmap, ~0, sizeof(rmap));
+		/* Always suppress zeros. */
+		dump_zeros = 0;
+	}
+
+	sun.sun_family = AF_UNIX;
+	sun.sun_path[0] = 0;
+	sprintf(sun.sun_path+1, "rtacct%d", getuid());
+
+	if (scan_interval > 0) {
+		if (time_constant == 0)
+			time_constant = 60;
+		time_constant *= 1000;
+		W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
+		if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
+			perror("rtacct: socket");
+			exit(-1);
+		}
+		if (bind(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
+			perror("rtacct: bind");
+			exit(-1);
+		}
+		if (listen(fd, 5) < 0) {
+			perror("rtacct: listen");
+			exit(-1);
+		}
+		if (daemon(0, 0)) {
+			perror("rtacct: daemon");
+			exit(-1);
+		}
+		signal(SIGPIPE, SIG_IGN);
+		signal(SIGCHLD, sigchild);
+		server_loop(fd);
+		exit(0);
+	}
+
+	if (getenv("RTACCT_HISTORY"))
+		snprintf(hist_name, sizeof(hist_name), "%s", getenv("RTACCT_HISTORY"));
+	else
+		sprintf(hist_name, "/tmp/.rtacct.u%d", getuid());
+
+	if (reset_history)
+		unlink(hist_name);
+
+	if (!ignore_history || !no_update) {
+		struct stat stb;
+
+		fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600);
+		if (fd < 0) {
+			perror("rtacct: open history file");
+			exit(-1);
+		}
+		if (flock(fd, LOCK_EX)) {
+			perror("rtacct: flock history file");
+			exit(-1);
+		}
+		if (fstat(fd, &stb) != 0) {
+			perror("rtacct: fstat history file");
+			exit(-1);
+		}
+		if (stb.st_nlink != 1 || stb.st_uid != getuid()) {
+			fprintf(stderr, "rtacct: something is so wrong with history file, that I prefer not to proceed.\n");
+			exit(-1);
+		}
+		if (stb.st_size != sizeof(*hist_db))
+			if (write(fd, kern_db, sizeof(*hist_db)) < 0) {
+				perror("rtacct: write history file");
+				exit(-1);
+			}
+
+		hist_db = mmap(NULL, sizeof(*hist_db),
+			       PROT_READ|PROT_WRITE,
+			       no_update ? MAP_PRIVATE : MAP_SHARED,
+			       fd, 0);
+
+		if ((unsigned long)hist_db == ~0UL) {
+			perror("mmap");
+			exit(-1);
+		}
+
+		if (!ignore_history) {
+			FILE *tfp;
+			long uptime = -1;
+
+			if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
+				if (fscanf(tfp, "%ld", &uptime) != 1)
+					uptime = -1;
+				fclose(tfp);
+			}
+
+			if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
+				fprintf(stderr, "rtacct: history is aged out, resetting\n");
+				memset(hist_db, 0, sizeof(*hist_db));
+			}
+		}
+
+		close(fd);
+	}
+
+	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
+	    (connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0
+	     || (strcpy(sun.sun_path+1, "rtacct0"),
+		 connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
+	    && verify_forging(fd) == 0) {
+		nread(fd, (char *)kern_db, sizeof(*kern_db));
+		if (hist_db && hist_db->signature[0] &&
+		    strcmp(kern_db->signature, hist_db->signature)) {
+			fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
+			hist_db = NULL;
+		}
+		close(fd);
+	} else {
+		if (fd >= 0)
+			close(fd);
+
+		if (hist_db && hist_db->signature[0] &&
+		    strcmp(hist_db->signature, "kernel")) {
+			fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
+			hist_db = NULL;
+		}
+
+		pad_kern_table(kern_db, read_kern_table(kern_db->ival));
+		strcpy(kern_db->signature, "kernel");
+	}
+
+	if (ignore_history || hist_db == NULL)
+		dump_abs_db(stdout);
+	else
+		dump_incr_db(stdout);
+
+	exit(0);
+}
diff --git a/misc/ss.c b/misc/ss.c
new file mode 100644
index 0000000..fb560a5
--- /dev/null
+++ b/misc/ss.c
@@ -0,0 +1,5887 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * ss.c		"sockstat", socket statistics
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <sys/sysmacros.h>
+#include <netinet/in.h>
+#include <string.h>
+#include <errno.h>
+#include <netdb.h>
+#include <arpa/inet.h>
+#include <dirent.h>
+#include <fnmatch.h>
+#include <getopt.h>
+#include <stdbool.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <ctype.h>
+
+#include "ss_util.h"
+#include "utils.h"
+#include "ll_map.h"
+#include "libnetlink.h"
+#include "namespace.h"
+#include "version.h"
+#include "rt_names.h"
+#include "cg_map.h"
+#include "selinux.h"
+
+#include <linux/tcp.h>
+#include <linux/unix_diag.h>
+#include <linux/netdevice.h>	/* for MAX_ADDR_LEN */
+#include <linux/filter.h>
+#include <linux/xdp_diag.h>
+#include <linux/packet_diag.h>
+#include <linux/netlink_diag.h>
+#include <linux/sctp.h>
+#include <linux/vm_sockets_diag.h>
+#include <linux/net.h>
+#include <linux/tipc.h>
+#include <linux/tipc_netlink.h>
+#include <linux/tipc_sockets_diag.h>
+#include <linux/tls.h>
+#include <linux/mptcp.h>
+
+#if HAVE_RPC
+#include <rpc/rpc.h>
+#include <rpc/xdr.h>
+#endif
+
+/* AF_VSOCK/PF_VSOCK is only provided since glibc 2.18 */
+#ifndef PF_VSOCK
+#define PF_VSOCK 40
+#endif
+#ifndef AF_VSOCK
+#define AF_VSOCK PF_VSOCK
+#endif
+
+#ifndef IPPROTO_MPTCP
+#define IPPROTO_MPTCP 262
+#endif
+
+#define BUF_CHUNK (1024 * 1024)	/* Buffer chunk allocation size */
+#define BUF_CHUNKS_MAX 5	/* Maximum number of allocated buffer chunks */
+#define LEN_ALIGN(x) (((x) + 1) & ~1)
+
+int preferred_family = AF_UNSPEC;
+static int show_options;
+int show_details;
+static int show_processes;
+static int show_threads;
+static int show_mem;
+static int show_tcpinfo;
+static int show_bpf;
+static int show_proc_ctx;
+static int show_sock_ctx;
+static int show_header = 1;
+static int follow_events;
+static int sctp_ino;
+static int show_tipcinfo;
+static int show_tos;
+static int show_cgroup;
+static int show_inet_sockopt;
+int oneline;
+
+enum col_id {
+	COL_NETID,
+	COL_STATE,
+	COL_RECVQ,
+	COL_SENDQ,
+	COL_ADDR,
+	COL_SERV,
+	COL_RADDR,
+	COL_RSERV,
+	COL_PROC,
+	COL_EXT,
+	COL_MAX
+};
+
+enum col_align {
+	ALIGN_LEFT,
+	ALIGN_CENTER,
+	ALIGN_RIGHT
+};
+
+struct column {
+	const enum col_align align;
+	const char *header;
+	const char *ldelim;
+	int disabled;
+	int width;	/* Calculated, including additional layout spacing */
+	int max_len;	/* Measured maximum field length in this column */
+};
+
+static struct column columns[] = {
+	{ ALIGN_LEFT,	"Netid",		"",	0, 0, 0 },
+	{ ALIGN_LEFT,	"State",		" ",	0, 0, 0 },
+	{ ALIGN_LEFT,	"Recv-Q",		" ",	0, 0, 0 },
+	{ ALIGN_LEFT,	"Send-Q",		" ",	0, 0, 0 },
+	{ ALIGN_RIGHT,	"Local Address:",	" ",	0, 0, 0 },
+	{ ALIGN_LEFT,	"Port",			"",	0, 0, 0 },
+	{ ALIGN_RIGHT,	"Peer Address:",	" ",	0, 0, 0 },
+	{ ALIGN_LEFT,	"Port",			"",	0, 0, 0 },
+	{ ALIGN_LEFT,	"Process",		"",	0, 0, 0 },
+	{ ALIGN_LEFT,	"",			"",	0, 0, 0 },
+};
+
+static struct column *current_field = columns;
+
+/* Output buffer: chained chunks of BUF_CHUNK bytes. Each field is written to
+ * the buffer as a variable size token. A token consists of a 16 bits length
+ * field, followed by a string which is not NULL-terminated.
+ *
+ * A new chunk is allocated and linked when the current chunk doesn't have
+ * enough room to store the current token as a whole.
+ */
+struct buf_chunk {
+	struct buf_chunk *next;	/* Next chained chunk */
+	char *end;		/* Current end of content */
+	char data[0];
+};
+
+struct buf_token {
+	uint16_t len;		/* Data length, excluding length descriptor */
+	char data[0];
+};
+
+static struct {
+	struct buf_token *cur;	/* Position of current token in chunk */
+	struct buf_chunk *head;	/* First chunk */
+	struct buf_chunk *tail;	/* Current chunk */
+	int chunks;		/* Number of allocated chunks */
+} buffer;
+
+static const char *TCP_PROTO = "tcp";
+static const char *UDP_PROTO = "udp";
+#ifdef HAVE_RPC
+static const char *TCP6_PROTO = "tcp6";
+static const char *UDP6_PROTO = "udp6";
+static const char *SCTP_PROTO = "sctp";
+#endif
+static const char *RAW_PROTO = "raw";
+static const char *dg_proto;
+
+enum {
+	TCP_DB,
+	MPTCP_DB,
+	DCCP_DB,
+	UDP_DB,
+	RAW_DB,
+	UNIX_DG_DB,
+	UNIX_ST_DB,
+	UNIX_SQ_DB,
+	PACKET_DG_DB,
+	PACKET_R_DB,
+	NETLINK_DB,
+	SCTP_DB,
+	VSOCK_ST_DB,
+	VSOCK_DG_DB,
+	TIPC_DB,
+	XDP_DB,
+	MAX_DB
+};
+
+#define PACKET_DBM ((1<<PACKET_DG_DB)|(1<<PACKET_R_DB))
+#define UNIX_DBM ((1<<UNIX_DG_DB)|(1<<UNIX_ST_DB)|(1<<UNIX_SQ_DB))
+#define ALL_DB ((1<<MAX_DB)-1)
+#define INET_L4_DBM ((1<<TCP_DB)|(1<<MPTCP_DB)|(1<<UDP_DB)|(1<<DCCP_DB)|(1<<SCTP_DB))
+#define INET_DBM (INET_L4_DBM | (1<<RAW_DB))
+#define VSOCK_DBM ((1<<VSOCK_ST_DB)|(1<<VSOCK_DG_DB))
+
+enum {
+	SS_UNKNOWN,
+	SS_ESTABLISHED,
+	SS_SYN_SENT,
+	SS_SYN_RECV,
+	SS_FIN_WAIT1,
+	SS_FIN_WAIT2,
+	SS_TIME_WAIT,
+	SS_CLOSE,
+	SS_CLOSE_WAIT,
+	SS_LAST_ACK,
+	SS_LISTEN,
+	SS_CLOSING,
+	SS_NEW_SYN_RECV, /* Kernel only value, not for use in user space */
+	SS_BOUND_INACTIVE,
+	SS_MAX
+};
+
+enum {
+	SCTP_STATE_CLOSED		= 0,
+	SCTP_STATE_COOKIE_WAIT		= 1,
+	SCTP_STATE_COOKIE_ECHOED	= 2,
+	SCTP_STATE_ESTABLISHED		= 3,
+	SCTP_STATE_SHUTDOWN_PENDING	= 4,
+	SCTP_STATE_SHUTDOWN_SENT	= 5,
+	SCTP_STATE_SHUTDOWN_RECEIVED	= 6,
+	SCTP_STATE_SHUTDOWN_ACK_SENT	= 7,
+};
+
+#define SS_ALL ((1 << SS_MAX) - 1)
+#define SS_CONN (SS_ALL & ~((1<<SS_LISTEN)|(1<<SS_CLOSE)|(1<<SS_TIME_WAIT)|(1<<SS_SYN_RECV)))
+#define TIPC_SS_CONN ((1<<SS_ESTABLISHED)|(1<<SS_LISTEN)|(1<<SS_CLOSE))
+
+#include "ssfilter.h"
+
+struct filter {
+	int dbs;
+	int states;
+	uint64_t families;
+	struct ssfilter *f;
+	bool kill;
+	struct rtnl_handle *rth_for_killing;
+};
+
+#define FAMILY_MASK(family) ((uint64_t)1 << (family))
+
+static const struct filter default_dbs[MAX_DB] = {
+	[TCP_DB] = {
+		.states   = SS_CONN,
+		.families = FAMILY_MASK(AF_INET) | FAMILY_MASK(AF_INET6),
+	},
+	[MPTCP_DB] = {
+		.states   = SS_CONN,
+		.families = FAMILY_MASK(AF_INET) | FAMILY_MASK(AF_INET6),
+	},
+	[DCCP_DB] = {
+		.states   = SS_CONN,
+		.families = FAMILY_MASK(AF_INET) | FAMILY_MASK(AF_INET6),
+	},
+	[UDP_DB] = {
+		.states   = (1 << SS_ESTABLISHED),
+		.families = FAMILY_MASK(AF_INET) | FAMILY_MASK(AF_INET6),
+	},
+	[RAW_DB] = {
+		.states   = (1 << SS_ESTABLISHED),
+		.families = FAMILY_MASK(AF_INET) | FAMILY_MASK(AF_INET6),
+	},
+	[UNIX_DG_DB] = {
+		.states   = (1 << SS_CLOSE),
+		.families = FAMILY_MASK(AF_UNIX),
+	},
+	[UNIX_ST_DB] = {
+		.states   = SS_CONN,
+		.families = FAMILY_MASK(AF_UNIX),
+	},
+	[UNIX_SQ_DB] = {
+		.states   = SS_CONN,
+		.families = FAMILY_MASK(AF_UNIX),
+	},
+	[PACKET_DG_DB] = {
+		.states   = (1 << SS_CLOSE),
+		.families = FAMILY_MASK(AF_PACKET),
+	},
+	[PACKET_R_DB] = {
+		.states   = (1 << SS_CLOSE),
+		.families = FAMILY_MASK(AF_PACKET),
+	},
+	[NETLINK_DB] = {
+		.states   = (1 << SS_CLOSE),
+		.families = FAMILY_MASK(AF_NETLINK),
+	},
+	[SCTP_DB] = {
+		.states   = SS_CONN,
+		.families = FAMILY_MASK(AF_INET) | FAMILY_MASK(AF_INET6),
+	},
+	[VSOCK_ST_DB] = {
+		.states   = SS_CONN,
+		.families = FAMILY_MASK(AF_VSOCK),
+	},
+	[VSOCK_DG_DB] = {
+		.states   = SS_CONN,
+		.families = FAMILY_MASK(AF_VSOCK),
+	},
+	[TIPC_DB] = {
+		.states   = TIPC_SS_CONN,
+		.families = FAMILY_MASK(AF_TIPC),
+	},
+	[XDP_DB] = {
+		.states   = (1 << SS_CLOSE),
+		.families = FAMILY_MASK(AF_XDP),
+	},
+};
+
+static const struct filter default_afs[AF_MAX] = {
+	[AF_INET] = {
+		.dbs    = INET_DBM,
+		.states = SS_CONN,
+	},
+	[AF_INET6] = {
+		.dbs    = INET_DBM,
+		.states = SS_CONN,
+	},
+	[AF_UNIX] = {
+		.dbs    = UNIX_DBM,
+		.states = SS_CONN,
+	},
+	[AF_PACKET] = {
+		.dbs    = PACKET_DBM,
+		.states = (1 << SS_CLOSE),
+	},
+	[AF_NETLINK] = {
+		.dbs    = (1 << NETLINK_DB),
+		.states = (1 << SS_CLOSE),
+	},
+	[AF_VSOCK] = {
+		.dbs    = VSOCK_DBM,
+		.states = SS_CONN,
+	},
+	[AF_TIPC] = {
+		.dbs    = (1 << TIPC_DB),
+		.states = TIPC_SS_CONN,
+	},
+	[AF_XDP] = {
+		.dbs    = (1 << XDP_DB),
+		.states = (1 << SS_CLOSE),
+	},
+};
+
+static int do_default = 1;
+static struct filter current_filter;
+
+static void filter_db_set(struct filter *f, int db, bool enable)
+{
+	if (enable) {
+		f->states   |= default_dbs[db].states;
+		f->dbs	    |= 1 << db;
+	} else {
+		f->dbs &= ~(1 << db);
+	}
+	do_default   = 0;
+}
+
+static int filter_db_parse(struct filter *f, const char *s)
+{
+	const struct {
+		const char *name;
+		int dbs[MAX_DB + 1];
+	} db_name_tbl[] = {
+#define ENTRY(name, ...) { #name, { __VA_ARGS__, MAX_DB } }
+		ENTRY(all, UDP_DB, DCCP_DB, TCP_DB, MPTCP_DB, RAW_DB,
+			   UNIX_ST_DB, UNIX_DG_DB, UNIX_SQ_DB,
+			   PACKET_R_DB, PACKET_DG_DB, NETLINK_DB,
+			   SCTP_DB, VSOCK_ST_DB, VSOCK_DG_DB, XDP_DB),
+		ENTRY(inet, UDP_DB, DCCP_DB, TCP_DB, MPTCP_DB, SCTP_DB, RAW_DB),
+		ENTRY(udp, UDP_DB),
+		ENTRY(dccp, DCCP_DB),
+		ENTRY(tcp, TCP_DB),
+		ENTRY(mptcp, MPTCP_DB),
+		ENTRY(sctp, SCTP_DB),
+		ENTRY(raw, RAW_DB),
+		ENTRY(unix, UNIX_ST_DB, UNIX_DG_DB, UNIX_SQ_DB),
+		ENTRY(unix_stream, UNIX_ST_DB),
+		ENTRY(u_str, UNIX_ST_DB),	/* alias for unix_stream */
+		ENTRY(unix_dgram, UNIX_DG_DB),
+		ENTRY(u_dgr, UNIX_DG_DB),	/* alias for unix_dgram */
+		ENTRY(unix_seqpacket, UNIX_SQ_DB),
+		ENTRY(u_seq, UNIX_SQ_DB),	/* alias for unix_seqpacket */
+		ENTRY(packet, PACKET_R_DB, PACKET_DG_DB),
+		ENTRY(packet_raw, PACKET_R_DB),
+		ENTRY(p_raw, PACKET_R_DB),	/* alias for packet_raw */
+		ENTRY(packet_dgram, PACKET_DG_DB),
+		ENTRY(p_dgr, PACKET_DG_DB),	/* alias for packet_dgram */
+		ENTRY(netlink, NETLINK_DB),
+		ENTRY(tipc, TIPC_DB),
+		ENTRY(vsock, VSOCK_ST_DB, VSOCK_DG_DB),
+		ENTRY(vsock_stream, VSOCK_ST_DB),
+		ENTRY(v_str, VSOCK_ST_DB),	/* alias for vsock_stream */
+		ENTRY(vsock_dgram, VSOCK_DG_DB),
+		ENTRY(v_dgr, VSOCK_DG_DB),	/* alias for vsock_dgram */
+		ENTRY(xdp, XDP_DB),
+#undef ENTRY
+	};
+	bool enable = true;
+	unsigned int i;
+	const int *dbp;
+
+	if (s[0] == '!') {
+		enable = false;
+		s++;
+	}
+	for (i = 0; i < ARRAY_SIZE(db_name_tbl); i++) {
+		if (strcmp(s, db_name_tbl[i].name))
+			continue;
+		for (dbp = db_name_tbl[i].dbs; *dbp != MAX_DB; dbp++)
+			filter_db_set(f, *dbp, enable);
+		return 0;
+	}
+	return -1;
+}
+
+static void filter_af_set(struct filter *f, int af)
+{
+	f->states	   |= default_afs[af].states;
+	f->families	   |= FAMILY_MASK(af);
+	do_default	    = 0;
+	preferred_family    = af;
+}
+
+static int filter_af_get(struct filter *f, int af)
+{
+	return !!(f->families & FAMILY_MASK(af));
+}
+
+static void filter_states_set(struct filter *f, int states)
+{
+	if (states)
+		f->states = states;
+}
+
+static void filter_merge_defaults(struct filter *f)
+{
+	int db;
+	int af;
+
+	for (db = 0; db < MAX_DB; db++) {
+		if (!(f->dbs & (1 << db)))
+			continue;
+
+		if (!(default_dbs[db].families & f->families))
+			f->families |= default_dbs[db].families;
+	}
+	for (af = 0; af < AF_MAX; af++) {
+		if (!(f->families & FAMILY_MASK(af)))
+			continue;
+
+		if (!(default_afs[af].dbs & f->dbs))
+			f->dbs |= default_afs[af].dbs;
+	}
+}
+
+static FILE *generic_proc_open(const char *env, const char *name)
+{
+	const char *p = getenv(env);
+	char store[128];
+
+	if (!p) {
+		p = getenv("PROC_ROOT") ? : "/proc";
+		snprintf(store, sizeof(store)-1, "%s/%s", p, name);
+		p = store;
+	}
+
+	return fopen(p, "r");
+}
+#define net_tcp_open()		generic_proc_open("PROC_NET_TCP", "net/tcp")
+#define net_tcp6_open()		generic_proc_open("PROC_NET_TCP6", "net/tcp6")
+#define net_udp_open()		generic_proc_open("PROC_NET_UDP", "net/udp")
+#define net_udp6_open()		generic_proc_open("PROC_NET_UDP6", "net/udp6")
+#define net_raw_open()		generic_proc_open("PROC_NET_RAW", "net/raw")
+#define net_raw6_open()		generic_proc_open("PROC_NET_RAW6", "net/raw6")
+#define net_unix_open()		generic_proc_open("PROC_NET_UNIX", "net/unix")
+#define net_packet_open()	generic_proc_open("PROC_NET_PACKET", \
+							"net/packet")
+#define net_netlink_open()	generic_proc_open("PROC_NET_NETLINK", \
+							"net/netlink")
+#define net_sockstat_open()	generic_proc_open("PROC_NET_SOCKSTAT", \
+							"net/sockstat")
+#define net_sockstat6_open()	generic_proc_open("PROC_NET_SOCKSTAT6", \
+							"net/sockstat6")
+#define net_snmp_open()		generic_proc_open("PROC_NET_SNMP", "net/snmp")
+#define ephemeral_ports_open()	generic_proc_open("PROC_IP_LOCAL_PORT_RANGE", \
+					"sys/net/ipv4/ip_local_port_range")
+
+struct user_ent {
+	struct user_ent	*next;
+	unsigned int	ino;
+	int		pid;
+	int		tid;
+	int		fd;
+	char		*task;
+	char		*task_ctx;
+	char		*socket_ctx;
+};
+
+#define USER_ENT_HASH_SIZE	256
+static struct user_ent *user_ent_hash[USER_ENT_HASH_SIZE];
+
+static int user_ent_hashfn(unsigned int ino)
+{
+	int val = (ino >> 24) ^ (ino >> 16) ^ (ino >> 8) ^ ino;
+
+	return val & (USER_ENT_HASH_SIZE - 1);
+}
+
+static void user_ent_add(unsigned int ino, char *task,
+					int pid, int tid, int fd,
+					char *task_ctx,
+					char *sock_ctx)
+{
+	struct user_ent *p, **pp;
+
+	p = malloc(sizeof(struct user_ent));
+	if (!p) {
+		fprintf(stderr, "ss: failed to malloc buffer\n");
+		abort();
+	}
+	p->next = NULL;
+	p->ino = ino;
+	p->pid = pid;
+	p->tid = tid;
+	p->fd = fd;
+	p->task = strdup(task);
+	p->task_ctx = strdup(task_ctx);
+	p->socket_ctx = strdup(sock_ctx);
+
+	pp = &user_ent_hash[user_ent_hashfn(ino)];
+	p->next = *pp;
+	*pp = p;
+}
+
+#define MAX_PATH_LEN	1024
+
+static void user_ent_hash_build_task(char *path, int pid, int tid)
+{
+	const char *no_ctx = "unavailable";
+	char task[16] = {'\0', };
+	char stat[MAX_PATH_LEN];
+	int pos_id, pos_fd;
+	char *task_context;
+	struct dirent *d;
+	DIR *dir;
+
+	if (getpidcon(tid, &task_context) != 0)
+		task_context = strdup(no_ctx);
+
+	pos_id = strlen(path);	/* $PROC_ROOT/$ID/ */
+
+	snprintf(path + pos_id, MAX_PATH_LEN - pos_id, "fd/");
+	dir = opendir(path);
+	if (!dir) {
+		freecon(task_context);
+		return;
+	}
+
+	pos_fd = strlen(path);	/* $PROC_ROOT/$ID/fd/ */
+
+	while ((d = readdir(dir)) != NULL) {
+		const char *pattern = "socket:[";
+		char *sock_context;
+		unsigned int ino;
+		ssize_t link_len;
+		char lnk[64];
+		int fd;
+
+		if (sscanf(d->d_name, "%d%*c", &fd) != 1)
+			continue;
+
+		snprintf(path + pos_fd, MAX_PATH_LEN - pos_fd, "%d", fd);
+
+		link_len = readlink(path, lnk, sizeof(lnk) - 1);
+		if (link_len == -1)
+			continue;
+		lnk[link_len] = '\0';
+
+		if (strncmp(lnk, pattern, strlen(pattern)))
+			continue;
+
+		if (sscanf(lnk, "socket:[%u]", &ino) != 1)
+			continue;
+
+		if (getfilecon(path, &sock_context) <= 0)
+			sock_context = strdup(no_ctx);
+
+		if (task[0] == '\0') {
+			FILE *fp;
+
+			strlcpy(stat, path, pos_id + 1);
+			snprintf(stat + pos_id, sizeof(stat) - pos_id, "stat");
+
+			fp = fopen(stat, "r");
+			if (fp) {
+				if (fscanf(fp, "%*d (%[^)])", task) < 1) {
+					; /* ignore */
+				}
+				fclose(fp);
+			}
+		}
+
+		user_ent_add(ino, task, pid, tid, fd, task_context, sock_context);
+		freecon(sock_context);
+	}
+
+	freecon(task_context);
+	closedir(dir);
+}
+
+static void user_ent_destroy(void)
+{
+	struct user_ent *p, *p_next;
+	int cnt = 0;
+
+	while (cnt != USER_ENT_HASH_SIZE) {
+		p = user_ent_hash[cnt];
+		while (p) {
+			free(p->task);
+			free(p->task_ctx);
+			free(p->socket_ctx);
+			p_next = p->next;
+			free(p);
+			p = p_next;
+		}
+		cnt++;
+	}
+}
+
+static void user_ent_hash_build(void)
+{
+	const char *root = getenv("PROC_ROOT") ? : "/proc/";
+	char name[MAX_PATH_LEN];
+	struct dirent *d;
+	int nameoff;
+	DIR *dir;
+
+	strlcpy(name, root, sizeof(name));
+
+	if (strlen(name) == 0 || name[strlen(name) - 1] != '/')
+		strcat(name, "/");
+
+	nameoff = strlen(name);
+
+	dir = opendir(name);
+	if (!dir)
+		return;
+
+	while ((d = readdir(dir)) != NULL) {
+		int pid;
+
+		if (sscanf(d->d_name, "%d%*c", &pid) != 1)
+			continue;
+
+		snprintf(name + nameoff, sizeof(name) - nameoff, "%d/", pid);
+		user_ent_hash_build_task(name, pid, pid);
+
+		if (show_threads) {
+			struct dirent *task_d;
+			DIR *task_dir;
+
+			snprintf(name + nameoff, sizeof(name) - nameoff, "%d/task/", pid);
+
+			task_dir = opendir(name);
+			if (!task_dir)
+				continue;
+
+			while ((task_d = readdir(task_dir)) != NULL) {
+				int tid;
+
+				if (sscanf(task_d->d_name, "%d%*c", &tid) != 1)
+					continue;
+				if (tid == pid)
+					continue;
+
+				snprintf(name + nameoff, sizeof(name) - nameoff, "%d/", tid);
+				user_ent_hash_build_task(name, pid, tid);
+			}
+			closedir(task_dir);
+		}
+	}
+	closedir(dir);
+}
+
+enum entry_types {
+	USERS,
+	PROC_CTX,
+	PROC_SOCK_CTX
+};
+
+#define ENTRY_BUF_SIZE 512
+static int find_entry(unsigned int ino, char **buf, int type)
+{
+	struct user_ent *p;
+	int cnt = 0;
+	char *ptr;
+	char thread_info[16] = {'\0', };
+	char *new_buf;
+	int len, new_buf_len;
+	int buf_used = 0;
+	int buf_len = 0;
+
+	if (!ino)
+		return 0;
+
+	p = user_ent_hash[user_ent_hashfn(ino)];
+	ptr = *buf = NULL;
+	while (p) {
+		if (p->ino != ino)
+			goto next;
+
+		while (1) {
+			ptr = *buf + buf_used;
+
+			if (show_threads)
+				snprintf(thread_info, sizeof(thread_info), "tid=%d,", p->tid);
+
+			switch (type) {
+			case USERS:
+				len = snprintf(ptr, buf_len - buf_used,
+					"(\"%s\",pid=%d,%sfd=%d),",
+					p->task, p->pid, thread_info, p->fd);
+				break;
+			case PROC_CTX:
+				len = snprintf(ptr, buf_len - buf_used,
+					"(\"%s\",pid=%d,%sproc_ctx=%s,fd=%d),",
+					p->task, p->pid, thread_info,
+					p->task_ctx, p->fd);
+				break;
+			case PROC_SOCK_CTX:
+				len = snprintf(ptr, buf_len - buf_used,
+					"(\"%s\",pid=%d,%sproc_ctx=%s,fd=%d,sock_ctx=%s),",
+					p->task, p->pid, thread_info,
+					p->task_ctx, p->fd,
+					p->socket_ctx);
+				break;
+			default:
+				fprintf(stderr, "ss: invalid type: %d\n", type);
+				abort();
+			}
+
+			if (len < 0 || len >= buf_len - buf_used) {
+				new_buf_len = buf_len + ENTRY_BUF_SIZE;
+				new_buf = realloc(*buf, new_buf_len);
+				if (!new_buf) {
+					fprintf(stderr, "ss: failed to malloc buffer\n");
+					abort();
+				}
+				*buf = new_buf;
+				buf_len = new_buf_len;
+				continue;
+			} else {
+				buf_used += len;
+				break;
+			}
+		}
+		cnt++;
+next:
+		p = p->next;
+	}
+	if (buf_used) {
+		ptr = *buf + buf_used;
+		ptr[-1] = '\0';
+	}
+	return cnt;
+}
+
+static unsigned long long cookie_sk_get(const uint32_t *cookie)
+{
+	return (((unsigned long long)cookie[1] << 31) << 1) | cookie[0];
+}
+
+static const char *sctp_sstate_name[] = {
+	[SCTP_STATE_CLOSED] = "CLOSED",
+	[SCTP_STATE_COOKIE_WAIT] = "COOKIE_WAIT",
+	[SCTP_STATE_COOKIE_ECHOED] = "COOKIE_ECHOED",
+	[SCTP_STATE_ESTABLISHED] = "ESTAB",
+	[SCTP_STATE_SHUTDOWN_PENDING] = "SHUTDOWN_PENDING",
+	[SCTP_STATE_SHUTDOWN_SENT] = "SHUTDOWN_SENT",
+	[SCTP_STATE_SHUTDOWN_RECEIVED] = "SHUTDOWN_RECEIVED",
+	[SCTP_STATE_SHUTDOWN_ACK_SENT] = "ACK_SENT",
+};
+
+static const char * const stype_nameg[] = {
+	"UNKNOWN",
+	[SOCK_STREAM] = "STREAM",
+	[SOCK_DGRAM] = "DGRAM",
+	[SOCK_RDM] = "RDM",
+	[SOCK_SEQPACKET] = "SEQPACKET",
+};
+
+struct sockstat {
+	struct sockstat	   *next;
+	unsigned int	    type;
+	uint16_t	    prot;
+	uint16_t	    raw_prot;
+	inet_prefix	    local;
+	inet_prefix	    remote;
+	int		    lport;
+	int		    rport;
+	int		    state;
+	int		    rq, wq;
+	unsigned int ino;
+	unsigned int uid;
+	int		    refcnt;
+	unsigned int	    iface;
+	unsigned long long  sk;
+	char *name;
+	char *peer_name;
+	__u32		    mark;
+	__u64		    cgroup_id;
+};
+
+struct dctcpstat {
+	unsigned int	ce_state;
+	unsigned int	alpha;
+	unsigned int	ab_ecn;
+	unsigned int	ab_tot;
+	bool		enabled;
+};
+
+struct tcpstat {
+	struct sockstat	    ss;
+	unsigned int	    timer;
+	unsigned int	    timeout;
+	int		    probes;
+	char		    cong_alg[16];
+	double		    rto, ato, rtt, rttvar;
+	int		    qack, ssthresh, backoff;
+	double		    send_bps;
+	int		    snd_wscale;
+	int		    rcv_wscale;
+	int		    mss;
+	int		    rcv_mss;
+	int		    advmss;
+	unsigned int	    pmtu;
+	unsigned int	    cwnd;
+	unsigned int	    lastsnd;
+	unsigned int	    lastrcv;
+	unsigned int	    lastack;
+	double		    pacing_rate;
+	double		    pacing_rate_max;
+	double		    delivery_rate;
+	unsigned long long  bytes_acked;
+	unsigned long long  bytes_received;
+	unsigned int	    segs_out;
+	unsigned int	    segs_in;
+	unsigned int	    data_segs_out;
+	unsigned int	    data_segs_in;
+	unsigned int	    unacked;
+	unsigned int	    retrans;
+	unsigned int	    retrans_total;
+	unsigned int	    lost;
+	unsigned int	    sacked;
+	unsigned int	    fackets;
+	unsigned int	    reordering;
+	unsigned int	    not_sent;
+	unsigned int	    delivered;
+	unsigned int	    delivered_ce;
+	unsigned int	    dsack_dups;
+	unsigned int	    reord_seen;
+	double		    rcv_rtt;
+	double		    min_rtt;
+	unsigned int 	    rcv_ooopack;
+	unsigned int	    snd_wnd;
+	unsigned int	    rcv_wnd;
+	unsigned int	    rehash;
+	int		    rcv_space;
+	unsigned int        rcv_ssthresh;
+	unsigned long long  busy_time;
+	unsigned long long  rwnd_limited;
+	unsigned long long  sndbuf_limited;
+	unsigned long long  bytes_sent;
+	unsigned long long  bytes_retrans;
+	bool		    has_ts_opt;
+	bool		    has_usec_ts_opt;
+	bool		    has_sack_opt;
+	bool		    has_ecn_opt;
+	bool		    has_ecnseen_opt;
+	bool		    has_fastopen_opt;
+	bool		    has_wscale_opt;
+	bool		    app_limited;
+	struct dctcpstat    *dctcp;
+	struct tcp_bbr_info *bbr_info;
+};
+
+/* SCTP assocs share the same inode number with their parent endpoint. So if we
+ * have seen the inode number before, it must be an assoc instead of the next
+ * endpoint. */
+static bool is_sctp_assoc(struct sockstat *s, const char *sock_name)
+{
+	if (strcmp(sock_name, "sctp"))
+		return false;
+	if (!sctp_ino || sctp_ino != s->ino)
+		return false;
+	return true;
+}
+
+static const char *unix_netid_name(int type)
+{
+	switch (type) {
+	case SOCK_STREAM:
+		return "u_str";
+	case SOCK_SEQPACKET:
+		return "u_seq";
+	case SOCK_DGRAM:
+	default:
+		return "u_dgr";
+	}
+}
+
+static const char *proto_name(int protocol)
+{
+	switch (protocol) {
+	case 0:
+		return "raw";
+	case IPPROTO_UDP:
+		return "udp";
+	case IPPROTO_TCP:
+		return "tcp";
+	case IPPROTO_MPTCP:
+		return "mptcp";
+	case IPPROTO_SCTP:
+		return "sctp";
+	case IPPROTO_DCCP:
+		return "dccp";
+	case IPPROTO_ICMPV6:
+		return "icmp6";
+	}
+
+	return "???";
+}
+
+static const char *vsock_netid_name(int type)
+{
+	switch (type) {
+	case SOCK_STREAM:
+		return "v_str";
+	case SOCK_DGRAM:
+		return "v_dgr";
+	default:
+		return "???";
+	}
+}
+
+static const char *tipc_netid_name(int type)
+{
+	switch (type) {
+	case SOCK_STREAM:
+		return "ti_st";
+	case SOCK_DGRAM:
+		return "ti_dg";
+	case SOCK_RDM:
+		return "ti_rd";
+	case SOCK_SEQPACKET:
+		return "ti_sq";
+	default:
+		return "???";
+	}
+}
+
+/* Allocate and initialize a new buffer chunk */
+static struct buf_chunk *buf_chunk_new(void)
+{
+	struct buf_chunk *new = malloc(BUF_CHUNK);
+
+	if (!new)
+		abort();
+
+	new->next = NULL;
+
+	/* This is also the last block */
+	buffer.tail = new;
+
+	/* Next token will be stored at the beginning of chunk data area, and
+	 * its initial length is zero.
+	 */
+	buffer.cur = (struct buf_token *)new->data;
+	buffer.cur->len = 0;
+
+	new->end = buffer.cur->data;
+
+	buffer.chunks++;
+
+	return new;
+}
+
+/* Return available tail room in given chunk */
+static int buf_chunk_avail(struct buf_chunk *chunk)
+{
+	return BUF_CHUNK - offsetof(struct buf_chunk, data) -
+	       (chunk->end - chunk->data);
+}
+
+/* Update end pointer and token length, link new chunk if we hit the end of the
+ * current one. Return -EAGAIN if we got a new chunk, caller has to print again.
+ */
+static int buf_update(int len)
+{
+	struct buf_chunk *chunk = buffer.tail;
+	struct buf_token *t = buffer.cur;
+
+	/* Claim success if new content fits in the current chunk, and anyway
+	 * if this is the first token in the chunk: in the latter case,
+	 * allocating a new chunk won't help, so we'll just cut the output.
+	 */
+	if ((len < buf_chunk_avail(chunk) && len != -1 /* glibc < 2.0.6 */) ||
+	    t == (struct buf_token *)chunk->data) {
+		len = min(len, buf_chunk_avail(chunk));
+
+		/* Total field length can't exceed 2^16 bytes, cut as needed */
+		len = min(len, USHRT_MAX - t->len);
+
+		chunk->end += len;
+		t->len += len;
+		return 0;
+	}
+
+	/* Content truncated, time to allocate more */
+	chunk->next = buf_chunk_new();
+
+	/* Copy current token over to new chunk, including length descriptor */
+	memcpy(chunk->next->data, t, sizeof(t->len) + t->len);
+	chunk->next->end += t->len;
+
+	/* Discard partially written field in old chunk */
+	chunk->end -= t->len + sizeof(t->len);
+
+	return -EAGAIN;
+}
+
+/* Append content to buffer as part of the current field */
+__attribute__((format(printf, 1, 2)))
+static void out(const char *fmt, ...)
+{
+	struct column *f = current_field;
+	va_list args;
+	char *pos;
+	int len;
+
+	if (f->disabled)
+		return;
+
+	if (!buffer.head)
+		buffer.head = buf_chunk_new();
+
+again:	/* Append to buffer: if we have a new chunk, print again */
+
+	pos = buffer.cur->data + buffer.cur->len;
+	va_start(args, fmt);
+
+	/* Limit to tail room. If we hit the limit, buf_update() will tell us */
+	len = vsnprintf(pos, buf_chunk_avail(buffer.tail), fmt, args);
+	va_end(args);
+
+	if (buf_update(len))
+		goto again;
+}
+
+static int print_left_spacing(struct column *f, int stored, int printed)
+{
+	int s;
+
+	if (!f->width || f->align == ALIGN_LEFT)
+		return 0;
+
+	s = f->width - stored - printed;
+	if (f->align == ALIGN_CENTER)
+		/* If count of total spacing is odd, shift right by one */
+		s = (s + 1) / 2;
+
+	if (s > 0)
+		return printf("%*c", s, ' ');
+
+	return 0;
+}
+
+static void print_right_spacing(struct column *f, int printed)
+{
+	int s;
+
+	if (!f->width || f->align == ALIGN_RIGHT)
+		return;
+
+	s = f->width - printed;
+	if (f->align == ALIGN_CENTER)
+		s /= 2;
+
+	if (s > 0)
+		printf("%*c", s, ' ');
+}
+
+/* Done with field: update buffer pointer, start new token after current one */
+static void field_flush(struct column *f)
+{
+	struct buf_chunk *chunk;
+	unsigned int pad;
+
+	if (f->disabled)
+		return;
+
+	chunk = buffer.tail;
+	pad = buffer.cur->len % 2;
+
+	if (buffer.cur->len > f->max_len)
+		f->max_len = buffer.cur->len;
+
+	/* We need a new chunk if we can't store the next length descriptor.
+	 * Mind the gap between end of previous token and next aligned position
+	 * for length descriptor.
+	 */
+	if (buf_chunk_avail(chunk) - pad < sizeof(buffer.cur->len)) {
+		chunk->end += pad;
+		chunk->next = buf_chunk_new();
+		return;
+	}
+
+	buffer.cur = (struct buf_token *)(buffer.cur->data +
+					  LEN_ALIGN(buffer.cur->len));
+	buffer.cur->len = 0;
+	buffer.tail->end = buffer.cur->data;
+}
+
+static int field_is_last(struct column *f)
+{
+	return f - columns == COL_MAX - 1;
+}
+
+/* Get the next available token in the buffer starting from the current token */
+static struct buf_token *buf_token_next(struct buf_token *cur)
+{
+	struct buf_chunk *chunk = buffer.tail;
+
+	/* If we reached the end of chunk contents, get token from next chunk */
+	if (cur->data + LEN_ALIGN(cur->len) == chunk->end) {
+		buffer.tail = chunk = chunk->next;
+		return chunk ? (struct buf_token *)chunk->data : NULL;
+	}
+
+	return (struct buf_token *)(cur->data + LEN_ALIGN(cur->len));
+}
+
+/* Free up all allocated buffer chunks */
+static void buf_free_all(void)
+{
+	struct buf_chunk *tmp;
+
+	for (buffer.tail = buffer.head; buffer.tail; ) {
+		tmp = buffer.tail;
+		buffer.tail = buffer.tail->next;
+		free(tmp);
+	}
+	buffer.head = NULL;
+	buffer.chunks = 0;
+}
+
+/* Get current screen width, returns -1 if TIOCGWINSZ fails */
+static int render_screen_width(void)
+{
+	int width = -1;
+
+	if (isatty(STDOUT_FILENO)) {
+		struct winsize w;
+
+		if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &w) != -1) {
+			if (w.ws_col > 0)
+				width = w.ws_col;
+		}
+	}
+
+	return width;
+}
+
+/* Calculate column width from contents length. If columns don't fit on one
+ * line, break them into the least possible amount of lines and keep them
+ * aligned across lines. Available screen space is equally spread between fields
+ * as additional spacing.
+ */
+static void render_calc_width(void)
+{
+	int screen_width, first, len = 0, linecols = 0;
+	struct column *c, *eol = columns - 1;
+	bool compact_output = false;
+
+	screen_width = render_screen_width();
+	if (screen_width == -1) {
+		screen_width = INT_MAX;
+		compact_output = true;
+	}
+
+	/* First pass: set width for each column to measured content length */
+	for (first = 1, c = columns; c - columns < COL_MAX; c++) {
+		if (c->disabled)
+			continue;
+
+		if (!first && c->max_len)
+			c->width = c->max_len + strlen(c->ldelim);
+		else
+			c->width = c->max_len;
+
+		/* But don't exceed screen size. If we exceed the screen size
+		 * for even a single field, it will just start on a line of its
+		 * own and then naturally wrap.
+		 */
+		c->width = min(c->width, screen_width);
+
+		if (c->width)
+			first = 0;
+	}
+
+	if (compact_output) {
+		/* Compact output, skip extending columns. */
+		return;
+	}
+
+	/* Second pass: find out newlines and distribute available spacing */
+	for (c = columns; c - columns < COL_MAX; c++) {
+		int pad, spacing, rem, last;
+		struct column *tmp;
+
+		if (!c->width)
+			continue;
+
+		linecols++;
+		len += c->width;
+
+		for (last = 1, tmp = c + 1; tmp - columns < COL_MAX; tmp++) {
+			if (tmp->width) {
+				last = 0;
+				break;
+			}
+		}
+
+		if (!last && len < screen_width) {
+			/* Columns fit on screen so far, nothing to do yet */
+			continue;
+		}
+
+		if (len == screen_width) {
+			/* Exact fit, just start with new line */
+			goto newline;
+		}
+
+		if (len > screen_width) {
+			/* Screen width exceeded: go back one column */
+			len -= c->width;
+			c--;
+			linecols--;
+		}
+
+		/* Distribute remaining space to columns on this line */
+		pad = screen_width - len;
+		spacing = pad / linecols;
+		rem = pad % linecols;
+		for (tmp = c; tmp > eol; tmp--) {
+			if (!tmp->width)
+				continue;
+
+			tmp->width += spacing;
+			if (rem) {
+				tmp->width++;
+				rem--;
+			}
+		}
+
+newline:
+		/* Line break: reset line counters, mark end-of-line */
+		eol = c;
+		len = 0;
+		linecols = 0;
+	}
+}
+
+/* Render buffered output with spacing and delimiters, then free up buffers */
+static void render(void)
+{
+	struct buf_token *token;
+	int printed, line_started = 0;
+	struct column *f;
+
+	if (!buffer.head)
+		return;
+
+	token = (struct buf_token *)buffer.head->data;
+
+	/* Ensure end alignment of last token, it wasn't necessarily flushed */
+	buffer.tail->end += buffer.cur->len % 2;
+
+	render_calc_width();
+
+	/* Rewind and replay */
+	buffer.tail = buffer.head;
+
+	f = columns;
+	while (!f->width)
+		f++;
+
+	while (token) {
+		/* Print left delimiter only if we already started a line */
+		if (line_started++)
+			printed = printf("%s", f->ldelim);
+		else
+			printed = 0;
+
+		/* Print field content from token data with spacing */
+		printed += print_left_spacing(f, token->len, printed);
+		printed += fwrite(token->data, 1, token->len, stdout);
+		print_right_spacing(f, printed);
+
+		/* Go to next non-empty field, deal with end-of-line */
+		do {
+			if (field_is_last(f)) {
+				printf("\n");
+				f = columns;
+				line_started = 0;
+			} else {
+				f++;
+			}
+		} while (f->disabled);
+
+		token = buf_token_next(token);
+	}
+	/* Deal with final end-of-line when the last non-empty field printed
+	 * is not the last field.
+	 */
+	if (line_started)
+		printf("\n");
+
+	buf_free_all();
+	current_field = columns;
+}
+
+/* Move to next field, and render buffer if we reached the maximum number of
+ * chunks, at the last field in a line.
+ */
+static void field_next(void)
+{
+	if (field_is_last(current_field) && buffer.chunks >= BUF_CHUNKS_MAX) {
+		render();
+		return;
+	}
+
+	field_flush(current_field);
+	if (field_is_last(current_field))
+		current_field = columns;
+	else
+		current_field++;
+}
+
+/* Walk through fields and flush them until we reach the desired one */
+static void field_set(enum col_id id)
+{
+	while (id != current_field - columns)
+		field_next();
+}
+
+/* Print header for all non-empty columns */
+static void print_header(void)
+{
+	while (!field_is_last(current_field)) {
+		if (!current_field->disabled)
+			out("%s", current_field->header);
+		field_next();
+	}
+}
+
+static void sock_state_print(struct sockstat *s)
+{
+	const char *sock_name;
+	static const char * const sstate_name[] = {
+		"UNKNOWN",
+		[SS_ESTABLISHED] = "ESTAB",
+		[SS_SYN_SENT] = "SYN-SENT",
+		[SS_SYN_RECV] = "SYN-RECV",
+		[SS_FIN_WAIT1] = "FIN-WAIT-1",
+		[SS_FIN_WAIT2] = "FIN-WAIT-2",
+		[SS_TIME_WAIT] = "TIME-WAIT",
+		[SS_CLOSE] = "UNCONN",
+		[SS_CLOSE_WAIT] = "CLOSE-WAIT",
+		[SS_LAST_ACK] = "LAST-ACK",
+		[SS_LISTEN] =	"LISTEN",
+		[SS_CLOSING] = "CLOSING",
+		[SS_NEW_SYN_RECV] = "UNDEF", /* Never returned by kernel */
+		[SS_BOUND_INACTIVE] = "UNDEF", /* Never returned by kernel */
+	};
+
+	switch (s->local.family) {
+	case AF_UNIX:
+		sock_name = unix_netid_name(s->type);
+		break;
+	case AF_INET:
+	case AF_INET6:
+		sock_name = proto_name(s->type);
+		break;
+	case AF_PACKET:
+		sock_name = s->type == SOCK_RAW ? "p_raw" : "p_dgr";
+		break;
+	case AF_NETLINK:
+		sock_name = "nl";
+		break;
+	case AF_TIPC:
+		sock_name = tipc_netid_name(s->type);
+		break;
+	case AF_VSOCK:
+		sock_name = vsock_netid_name(s->type);
+		break;
+	case AF_XDP:
+		sock_name = "xdp";
+		break;
+	default:
+		sock_name = "unknown";
+	}
+
+	if (is_sctp_assoc(s, sock_name)) {
+		field_set(COL_STATE);		/* Empty Netid field */
+		out("`- %s", sctp_sstate_name[s->state]);
+	} else {
+		field_set(COL_NETID);
+		out("%s", sock_name);
+		field_set(COL_STATE);
+		out("%s", sstate_name[s->state]);
+	}
+
+	field_set(COL_RECVQ);
+	out("%-6d", s->rq);
+	field_set(COL_SENDQ);
+	out("%-6d", s->wq);
+	field_set(COL_ADDR);
+}
+
+static void sock_details_print(struct sockstat *s)
+{
+	if (s->uid)
+		out(" uid:%u", s->uid);
+
+	out(" ino:%u", s->ino);
+	out(" sk:%llx", s->sk);
+
+	if (s->mark)
+		out(" fwmark:0x%x", s->mark);
+
+	if (s->cgroup_id)
+		out(" cgroup:%s", cg_id_to_path(s->cgroup_id));
+}
+
+static void sock_addr_print(const char *addr, char *delim, const char *port,
+		const char *ifname)
+{
+	if (ifname)
+		out("%s" "%%" "%s%s", addr, ifname, delim);
+	else
+		out("%s%s", addr, delim);
+
+	field_next();
+	out("%s", port);
+	field_next();
+}
+
+static const char *print_ms_timer(unsigned int timeout)
+{
+	static char buf[64];
+	int secs, msecs, minutes;
+
+	secs = timeout/1000;
+	minutes = secs/60;
+	secs = secs%60;
+	msecs = timeout%1000;
+	buf[0] = 0;
+	if (minutes) {
+		msecs = 0;
+		snprintf(buf, sizeof(buf)-16, "%dmin", minutes);
+		if (minutes > 9)
+			secs = 0;
+	}
+	if (secs) {
+		if (secs > 9)
+			msecs = 0;
+		sprintf(buf+strlen(buf), "%d%s", secs, msecs ? "." : "sec");
+	}
+	if (msecs)
+		sprintf(buf+strlen(buf), "%03dms", msecs);
+	return buf;
+}
+
+struct scache {
+	struct scache *next;
+	int port;
+	char *name;
+	const char *proto;
+};
+
+static struct scache *rlist;
+
+#ifdef HAVE_RPC
+static CLIENT *rpc_client_create(rpcprog_t prog, rpcvers_t vers)
+{
+	struct netbuf nbuf;
+	struct sockaddr_un saddr;
+	int sock;
+
+	memset(&saddr, 0, sizeof(saddr));
+	sock = socket(AF_LOCAL, SOCK_STREAM, 0);
+	if (sock < 0)
+		return NULL;
+
+	saddr.sun_family = AF_LOCAL;
+	strcpy(saddr.sun_path, _PATH_RPCBINDSOCK);
+	nbuf.len = SUN_LEN(&saddr);
+	nbuf.maxlen = sizeof(struct sockaddr_un);
+	nbuf.buf = &saddr;
+
+	return clnt_vc_create(sock, &nbuf, prog, vers, 0, 0);
+}
+
+static void init_service_resolver(void)
+{
+	struct rpcblist *rhead = NULL;
+	struct timeval timeout;
+	struct rpcent *rpc;
+	enum clnt_stat res;
+	CLIENT *client;
+
+	timeout.tv_sec = 5;
+	timeout.tv_usec = 0;
+
+	client = rpc_client_create(PMAPPROG, RPCBVERS4);
+	if (!client)
+		return;
+
+	res = clnt_call(client, RPCBPROC_DUMP, (xdrproc_t)xdr_void, NULL,
+			(xdrproc_t)xdr_rpcblist_ptr, (char *)&rhead,
+			timeout);
+	if (res != RPC_SUCCESS)
+		return;
+
+	for (; rhead; rhead = rhead->rpcb_next) {
+		char prog[128] = "rpc.";
+		struct scache *c;
+		int hport, lport, ok;
+
+		c = malloc(sizeof(*c));
+		if (!c)
+			continue;
+
+		ok = sscanf(rhead->rpcb_map.r_addr, "::.%d.%d", &hport, &lport);
+		if (!ok)
+			ok = sscanf(rhead->rpcb_map.r_addr, "0.0.0.0.%d.%d",
+				    &hport, &lport);
+		if (!ok)
+			continue;
+		c->port = hport << 8 | lport;
+
+		if (strcmp(rhead->rpcb_map.r_netid, TCP_PROTO) == 0 ||
+		    strcmp(rhead->rpcb_map.r_netid, TCP6_PROTO) == 0)
+			c->proto = TCP_PROTO;
+		else if (strcmp(rhead->rpcb_map.r_netid, UDP_PROTO) == 0 ||
+			 strcmp(rhead->rpcb_map.r_netid, UDP6_PROTO) == 0)
+			c->proto = UDP_PROTO;
+		else if (strcmp(rhead->rpcb_map.r_netid, SCTP_PROTO) == 0)
+			c->proto = SCTP_PROTO;
+		else
+			continue;
+
+		rpc = getrpcbynumber(rhead->rpcb_map.r_prog);
+		if (rpc) {
+			strncat(prog, rpc->r_name, 128 - strlen(prog));
+			c->name = strdup(prog);
+		}
+
+		c->next = rlist;
+		rlist = c;
+	}
+}
+#endif
+
+/* Even do not try default linux ephemeral port ranges:
+ * default /etc/services contains so much of useless crap
+ * wouldbe "allocated" to this area that resolution
+ * is really harmful. I shrug each time when seeing
+ * "socks" or "cfinger" in dumps.
+ */
+static int is_ephemeral(int port)
+{
+	static int min = 0, max;
+
+	if (!min) {
+		FILE *f = ephemeral_ports_open();
+
+		if (!f || fscanf(f, "%d %d", &min, &max) < 2) {
+			min = 1024;
+			max = 4999;
+		}
+		if (f)
+			fclose(f);
+	}
+	return port >= min && port <= max;
+}
+
+
+static const char *__resolve_service(int port)
+{
+	struct scache *c;
+
+	for (c = rlist; c; c = c->next) {
+		if (c->port == port && c->proto == dg_proto)
+			return c->name;
+	}
+
+	if (!is_ephemeral(port)) {
+		static int notfirst;
+		struct servent *se;
+
+		if (!notfirst) {
+			setservent(1);
+			notfirst = 1;
+		}
+		se = getservbyport(htons(port), dg_proto);
+		if (se)
+			return se->s_name;
+	}
+
+	return NULL;
+}
+
+#define SCACHE_BUCKETS 1024
+static struct scache *cache_htab[SCACHE_BUCKETS];
+
+static const char *resolve_service(int port)
+{
+	static char buf[128];
+	struct scache *c;
+	const char *res;
+	int hash;
+
+	if (port == 0) {
+		buf[0] = '*';
+		buf[1] = 0;
+		return buf;
+	}
+
+	if (numeric)
+		goto do_numeric;
+
+	if (dg_proto == RAW_PROTO)
+		return inet_proto_n2a(port, buf, sizeof(buf));
+
+
+	hash = (port^(((unsigned long)dg_proto)>>2)) % SCACHE_BUCKETS;
+
+	for (c = cache_htab[hash]; c; c = c->next) {
+		if (c->port == port && c->proto == dg_proto)
+			goto do_cache;
+	}
+
+	c = malloc(sizeof(*c));
+	if (!c)
+		goto do_numeric;
+	res = __resolve_service(port);
+	c->port = port;
+	c->name = res ? strdup(res) : NULL;
+	c->proto = dg_proto;
+	c->next = cache_htab[hash];
+	cache_htab[hash] = c;
+
+do_cache:
+	if (c->name)
+		return c->name;
+
+do_numeric:
+	sprintf(buf, "%u", port);
+	return buf;
+}
+
+static void inet_addr_print(const inet_prefix *a, int port,
+			    unsigned int ifindex, bool v6only)
+{
+	char buf[1024];
+	const char *ap = buf;
+	const char *ifname = NULL;
+
+	if (a->family == AF_INET) {
+		ap = format_host(AF_INET, 4, a->data);
+	} else {
+		if (!v6only &&
+		    !memcmp(a->data, &in6addr_any, sizeof(in6addr_any))) {
+			buf[0] = '*';
+			buf[1] = 0;
+		} else {
+			ap = format_host(a->family, 16, a->data);
+
+			/* Numeric IPv6 addresses should be bracketed */
+			if (strchr(ap, ':')) {
+				snprintf(buf, sizeof(buf),
+					 "[%s]", ap);
+				ap = buf;
+			}
+		}
+	}
+
+	if (ifindex)
+		ifname = ll_index_to_name(ifindex);
+
+	sock_addr_print(ap, ":", resolve_service(port), ifname);
+}
+
+struct aafilter {
+	inet_prefix	addr;
+	long		port;
+	unsigned int	iface;
+	__u32		mark;
+	__u32		mask;
+	__u64		cgroup_id;
+	struct aafilter *next;
+};
+
+static int inet2_addr_match(const inet_prefix *a, const inet_prefix *p,
+			    int plen)
+{
+	if (!inet_addr_match(a, p, plen))
+		return 0;
+
+	/* Cursed "v4 mapped" addresses: v4 mapped socket matches
+	 * pure IPv4 rule, but v4-mapped rule selects only v4-mapped
+	 * sockets. Fair? */
+	if (p->family == AF_INET && a->family == AF_INET6) {
+		if (a->data[0] == 0 && a->data[1] == 0 &&
+		    a->data[2] == htonl(0xffff)) {
+			inet_prefix tmp = *a;
+
+			tmp.data[0] = a->data[3];
+			return inet_addr_match(&tmp, p, plen);
+		}
+	}
+	return 1;
+}
+
+static int unix_match(const inet_prefix *a, const inet_prefix *p)
+{
+	char *addr, *pattern;
+
+	memcpy(&addr, a->data, sizeof(addr));
+	memcpy(&pattern, p->data, sizeof(pattern));
+	if (pattern == NULL)
+		return 1;
+	if (addr == NULL)
+		addr = "";
+	return !fnmatch(pattern, addr, FNM_CASEFOLD);
+}
+
+static int run_ssfilter(struct ssfilter *f, struct sockstat *s)
+{
+	switch (f->type) {
+		case SSF_S_AUTO:
+	{
+		if (s->local.family == AF_UNIX) {
+			char *p;
+
+			memcpy(&p, s->local.data, sizeof(p));
+			return p == NULL || (p[0] == '@' && strlen(p) == 6 &&
+					     strspn(p+1, "0123456789abcdef") == 5);
+		}
+		if (s->local.family == AF_PACKET)
+			return s->lport == 0 && s->local.data[0] == 0;
+		if (s->local.family == AF_NETLINK)
+			return s->lport < 0;
+		if (s->local.family == AF_VSOCK)
+			return s->lport > 1023;
+
+		return is_ephemeral(s->lport);
+	}
+		case SSF_DCOND:
+	{
+		struct aafilter *a = (void *)f->pred;
+
+		if (a->addr.family == AF_UNIX)
+			return unix_match(&s->remote, &a->addr);
+		if (a->port != -1 && a->port != s->rport)
+			return 0;
+		if (a->addr.bitlen) {
+			do {
+				if (!inet2_addr_match(&s->remote, &a->addr, a->addr.bitlen))
+					return 1;
+			} while ((a = a->next) != NULL);
+			return 0;
+		}
+		return 1;
+	}
+		case SSF_SCOND:
+	{
+		struct aafilter *a = (void *)f->pred;
+
+		if (a->addr.family == AF_UNIX)
+			return unix_match(&s->local, &a->addr);
+		if (a->port != -1 && a->port != s->lport)
+			return 0;
+		if (a->addr.bitlen) {
+			do {
+				if (!inet2_addr_match(&s->local, &a->addr, a->addr.bitlen))
+					return 1;
+			} while ((a = a->next) != NULL);
+			return 0;
+		}
+		return 1;
+	}
+		case SSF_D_GE:
+	{
+		struct aafilter *a = (void *)f->pred;
+
+		return s->rport >= a->port;
+	}
+		case SSF_D_LE:
+	{
+		struct aafilter *a = (void *)f->pred;
+
+		return s->rport <= a->port;
+	}
+		case SSF_S_GE:
+	{
+		struct aafilter *a = (void *)f->pred;
+
+		return s->lport >= a->port;
+	}
+		case SSF_S_LE:
+	{
+		struct aafilter *a = (void *)f->pred;
+
+		return s->lport <= a->port;
+	}
+		case SSF_DEVCOND:
+	{
+		struct aafilter *a = (void *)f->pred;
+
+		return s->iface == a->iface;
+	}
+		case SSF_MARKMASK:
+	{
+		struct aafilter *a = (void *)f->pred;
+
+		return (s->mark & a->mask) == a->mark;
+	}
+		case SSF_CGROUPCOND:
+	{
+		struct aafilter *a = (void *)f->pred;
+
+		return s->cgroup_id == a->cgroup_id;
+	}
+		/* Yup. It is recursion. Sorry. */
+		case SSF_AND:
+		return run_ssfilter(f->pred, s) && run_ssfilter(f->post, s);
+		case SSF_OR:
+		return run_ssfilter(f->pred, s) || run_ssfilter(f->post, s);
+		case SSF_NOT:
+		return !run_ssfilter(f->pred, s);
+		default:
+		abort();
+	}
+}
+
+/* Relocate external jumps by reloc. */
+static void ssfilter_patch(char *a, int len, int reloc)
+{
+	while (len > 0) {
+		struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)a;
+
+		if (op->no == len+4)
+			op->no += reloc;
+		len -= op->yes;
+		a += op->yes;
+	}
+	if (len < 0)
+		abort();
+}
+
+static int ssfilter_bytecompile(struct ssfilter *f, char **bytecode)
+{
+	switch (f->type) {
+		case SSF_S_AUTO:
+	{
+		if (!(*bytecode = malloc(4))) abort();
+		((struct inet_diag_bc_op *)*bytecode)[0] = (struct inet_diag_bc_op){ INET_DIAG_BC_AUTO, 4, 8 };
+		return 4;
+	}
+		case SSF_DCOND:
+		case SSF_SCOND:
+	{
+		struct aafilter *a = (void *)f->pred;
+		struct aafilter *b;
+		char *ptr;
+		int  code = (f->type == SSF_DCOND ? INET_DIAG_BC_D_COND : INET_DIAG_BC_S_COND);
+		int len = 0;
+
+		for (b = a; b; b = b->next) {
+			len += 4 + sizeof(struct inet_diag_hostcond);
+			if (a->addr.family == AF_INET6)
+				len += 16;
+			else
+				len += 4;
+			if (b->next)
+				len += 4;
+		}
+		if (!(ptr = malloc(len))) abort();
+		*bytecode = ptr;
+		for (b = a; b; b = b->next) {
+			struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)ptr;
+			int alen = (a->addr.family == AF_INET6 ? 16 : 4);
+			int oplen = alen + 4 + sizeof(struct inet_diag_hostcond);
+			struct inet_diag_hostcond *cond = (struct inet_diag_hostcond *)(ptr+4);
+
+			*op = (struct inet_diag_bc_op){ code, oplen, oplen+4 };
+			cond->family = a->addr.family;
+			cond->port = a->port;
+			cond->prefix_len = a->addr.bitlen;
+			memcpy(cond->addr, a->addr.data, alen);
+			ptr += oplen;
+			if (b->next) {
+				op = (struct inet_diag_bc_op *)ptr;
+				*op = (struct inet_diag_bc_op){ INET_DIAG_BC_JMP, 4, len - (ptr-*bytecode)};
+				ptr += 4;
+			}
+		}
+		return ptr - *bytecode;
+	}
+		case SSF_D_GE:
+	{
+		struct aafilter *x = (void *)f->pred;
+
+		if (!(*bytecode = malloc(8))) abort();
+		((struct inet_diag_bc_op *)*bytecode)[0] = (struct inet_diag_bc_op){ INET_DIAG_BC_D_GE, 8, 12 };
+		((struct inet_diag_bc_op *)*bytecode)[1] = (struct inet_diag_bc_op){ 0, 0, x->port };
+		return 8;
+	}
+		case SSF_D_LE:
+	{
+		struct aafilter *x = (void *)f->pred;
+
+		if (!(*bytecode = malloc(8))) abort();
+		((struct inet_diag_bc_op *)*bytecode)[0] = (struct inet_diag_bc_op){ INET_DIAG_BC_D_LE, 8, 12 };
+		((struct inet_diag_bc_op *)*bytecode)[1] = (struct inet_diag_bc_op){ 0, 0, x->port };
+		return 8;
+	}
+		case SSF_S_GE:
+	{
+		struct aafilter *x = (void *)f->pred;
+
+		if (!(*bytecode = malloc(8))) abort();
+		((struct inet_diag_bc_op *)*bytecode)[0] = (struct inet_diag_bc_op){ INET_DIAG_BC_S_GE, 8, 12 };
+		((struct inet_diag_bc_op *)*bytecode)[1] = (struct inet_diag_bc_op){ 0, 0, x->port };
+		return 8;
+	}
+		case SSF_S_LE:
+	{
+		struct aafilter *x = (void *)f->pred;
+
+		if (!(*bytecode = malloc(8))) abort();
+		((struct inet_diag_bc_op *)*bytecode)[0] = (struct inet_diag_bc_op){ INET_DIAG_BC_S_LE, 8, 12 };
+		((struct inet_diag_bc_op *)*bytecode)[1] = (struct inet_diag_bc_op){ 0, 0, x->port };
+		return 8;
+	}
+
+		case SSF_AND:
+	{
+		char *a1 = NULL, *a2 = NULL, *a;
+		int l1, l2;
+
+		l1 = ssfilter_bytecompile(f->pred, &a1);
+		l2 = ssfilter_bytecompile(f->post, &a2);
+		if (!l1 || !l2) {
+			free(a1);
+			free(a2);
+			return 0;
+		}
+		if (!(a = malloc(l1+l2))) abort();
+		memcpy(a, a1, l1);
+		memcpy(a+l1, a2, l2);
+		free(a1); free(a2);
+		ssfilter_patch(a, l1, l2);
+		*bytecode = a;
+		return l1+l2;
+	}
+		case SSF_OR:
+	{
+		char *a1 = NULL, *a2 = NULL, *a;
+		int l1, l2;
+
+		l1 = ssfilter_bytecompile(f->pred, &a1);
+		l2 = ssfilter_bytecompile(f->post, &a2);
+		if (!l1 || !l2) {
+			free(a1);
+			free(a2);
+			return 0;
+		}
+		if (!(a = malloc(l1+l2+4))) abort();
+		memcpy(a, a1, l1);
+		memcpy(a+l1+4, a2, l2);
+		free(a1); free(a2);
+		*(struct inet_diag_bc_op *)(a+l1) = (struct inet_diag_bc_op){ INET_DIAG_BC_JMP, 4, l2+4 };
+		*bytecode = a;
+		return l1+l2+4;
+	}
+		case SSF_NOT:
+	{
+		char *a1 = NULL, *a;
+		int l1;
+
+		l1 = ssfilter_bytecompile(f->pred, &a1);
+		if (!l1) {
+			free(a1);
+			return 0;
+		}
+		if (!(a = malloc(l1+4))) abort();
+		memcpy(a, a1, l1);
+		free(a1);
+		*(struct inet_diag_bc_op *)(a+l1) = (struct inet_diag_bc_op){ INET_DIAG_BC_JMP, 4, 8 };
+		*bytecode = a;
+		return l1+4;
+	}
+		case SSF_DEVCOND:
+	{
+		/* bytecompile for SSF_DEVCOND not supported yet */
+		return 0;
+	}
+		case SSF_MARKMASK:
+	{
+		struct aafilter *a = (void *)f->pred;
+		struct instr {
+			struct inet_diag_bc_op op;
+			struct inet_diag_markcond cond;
+		};
+		int inslen = sizeof(struct instr);
+
+		if (!(*bytecode = malloc(inslen))) abort();
+		((struct instr *)*bytecode)[0] = (struct instr) {
+			{ INET_DIAG_BC_MARK_COND, inslen, inslen + 4 },
+			{ a->mark, a->mask},
+		};
+
+		return inslen;
+	}
+		case SSF_CGROUPCOND:
+	{
+		struct aafilter *a = (void *)f->pred;
+		struct instr {
+			struct inet_diag_bc_op op;
+			__u64 cgroup_id;
+		} __attribute__((packed));
+		int inslen = sizeof(struct instr);
+
+		if (!(*bytecode = malloc(inslen))) abort();
+		((struct instr *)*bytecode)[0] = (struct instr) {
+			{ INET_DIAG_BC_CGROUP_COND, inslen, inslen + 4 },
+			a->cgroup_id,
+		};
+
+		return inslen;
+	}
+		default:
+		abort();
+	}
+}
+
+static int remember_he(struct aafilter *a, struct hostent *he)
+{
+	char **ptr = he->h_addr_list;
+	int cnt = 0;
+	int len;
+
+	if (he->h_addrtype == AF_INET)
+		len = 4;
+	else if (he->h_addrtype == AF_INET6)
+		len = 16;
+	else
+		return 0;
+
+	while (*ptr) {
+		struct aafilter *b = a;
+
+		if (a->addr.bitlen) {
+			if ((b = malloc(sizeof(*b))) == NULL)
+				return cnt;
+			*b = *a;
+			a->next = b;
+		}
+		memcpy(b->addr.data, *ptr, len);
+		b->addr.bytelen = len;
+		b->addr.bitlen = len*8;
+		b->addr.family = he->h_addrtype;
+		ptr++;
+		cnt++;
+	}
+	return cnt;
+}
+
+static int get_dns_host(struct aafilter *a, const char *addr, int fam)
+{
+	static int notfirst;
+	int cnt = 0;
+	struct hostent *he;
+
+	a->addr.bitlen = 0;
+	if (!notfirst) {
+		sethostent(1);
+		notfirst = 1;
+	}
+	he = gethostbyname2(addr, fam == AF_UNSPEC ? AF_INET : fam);
+	if (he)
+		cnt = remember_he(a, he);
+	if (fam == AF_UNSPEC) {
+		he = gethostbyname2(addr, AF_INET6);
+		if (he)
+			cnt += remember_he(a, he);
+	}
+	return !cnt;
+}
+
+static int xll_initted;
+
+static void xll_init(void)
+{
+	struct rtnl_handle rth;
+
+	if (rtnl_open(&rth, 0) < 0)
+		exit(1);
+
+	ll_init_map(&rth);
+	rtnl_close(&rth);
+	xll_initted = 1;
+}
+
+static const char *xll_index_to_name(int index)
+{
+	if (!xll_initted)
+		xll_init();
+	return ll_index_to_name(index);
+}
+
+static int xll_name_to_index(const char *dev)
+{
+	if (!xll_initted)
+		xll_init();
+	return ll_name_to_index(dev);
+}
+
+void *parse_devcond(char *name)
+{
+	struct aafilter a = { .iface = 0 };
+	struct aafilter *res;
+
+	a.iface = xll_name_to_index(name);
+	if (a.iface == 0) {
+		char *end;
+		unsigned long n;
+
+		n = strtoul(name, &end, 0);
+		if (!end || end == name || *end || n > UINT_MAX)
+			return NULL;
+
+		a.iface = n;
+	}
+
+	res = malloc(sizeof(*res));
+	*res = a;
+
+	return res;
+}
+
+static void vsock_set_inet_prefix(inet_prefix *a, __u32 cid)
+{
+	*a = (inet_prefix){
+		.bytelen = sizeof(cid),
+		.family = AF_VSOCK,
+	};
+	memcpy(a->data, &cid, sizeof(cid));
+}
+
+static char* find_port(char *addr, bool is_port)
+{
+	char *port = NULL;
+	if (is_port)
+		port = addr;
+	else
+		port = strchr(addr, ':');
+	if (port && *port == ':')
+		*port++ = '\0';
+	return port;
+}
+
+void *parse_hostcond(char *addr, bool is_port)
+{
+	char *port = NULL;
+	struct aafilter a = { .port = -1 };
+	struct aafilter *res;
+	int fam = preferred_family;
+	struct filter *f = &current_filter;
+
+	if (strncmp(addr, "unix:", 5) == 0) {
+		fam = AF_UNIX;
+		addr += 5;
+	} else if (strncmp(addr, "link:", 5) == 0) {
+		fam = AF_PACKET;
+		addr += 5;
+	} else if (strncmp(addr, "netlink:", 8) == 0) {
+		fam = AF_NETLINK;
+		addr += 8;
+	} else if (strncmp(addr, "vsock:", 6) == 0) {
+		fam = AF_VSOCK;
+		addr += 6;
+	} else if (strncmp(addr, "inet:", 5) == 0) {
+		fam = AF_INET;
+		addr += 5;
+	} else if (strncmp(addr, "inet6:", 6) == 0) {
+		fam = AF_INET6;
+		addr += 6;
+	}
+
+	if (fam == AF_UNIX) {
+		char *p;
+
+		a.addr.family = AF_UNIX;
+		p = strdup(addr);
+		a.addr.bitlen = 8*strlen(p);
+		memcpy(a.addr.data, &p, sizeof(p));
+		goto out;
+	}
+
+	if (fam == AF_PACKET) {
+		a.addr.family = AF_PACKET;
+		a.addr.bitlen = 0;
+		port = find_port(addr, is_port);
+		if (port) {
+			if (*port && strcmp(port, "*")) {
+				if (get_long(&a.port, port, 0)) {
+					if ((a.port = xll_name_to_index(port)) <= 0)
+						return NULL;
+				}
+			}
+		}
+		if (!is_port && addr[0] && strcmp(addr, "*")) {
+			unsigned short tmp;
+
+			a.addr.bitlen = 32;
+			if (ll_proto_a2n(&tmp, addr))
+				return NULL;
+			a.addr.data[0] = ntohs(tmp);
+		}
+		goto out;
+	}
+
+	if (fam == AF_NETLINK) {
+		a.addr.family = AF_NETLINK;
+		a.addr.bitlen = 0;
+		port = find_port(addr, is_port);
+		if (port) {
+			if (*port && strcmp(port, "*")) {
+				if (get_long(&a.port, port, 0)) {
+					if (strcmp(port, "kernel") == 0)
+						a.port = 0;
+					else
+						return NULL;
+				}
+			}
+		}
+		if (!is_port && addr[0] && strcmp(addr, "*")) {
+			a.addr.bitlen = 32;
+			if (nl_proto_a2n(&a.addr.data[0], addr) == -1)
+				return NULL;
+		}
+		goto out;
+	}
+
+	if (fam == AF_VSOCK) {
+		__u32 cid = ~(__u32)0;
+
+		a.addr.family = AF_VSOCK;
+
+		port = find_port(addr, is_port);
+
+		if (port && strcmp(port, "*") &&
+		    get_u32((__u32 *)&a.port, port, 0))
+			return NULL;
+
+		if (!is_port && addr[0] && strcmp(addr, "*")) {
+			a.addr.bitlen = 32;
+			if (get_u32(&cid, addr, 0))
+				return NULL;
+		}
+		vsock_set_inet_prefix(&a.addr, cid);
+		goto out;
+	}
+
+	/* URL-like literal [] */
+	if (addr[0] == '[') {
+		addr++;
+		if ((port = strchr(addr, ']')) == NULL)
+			return NULL;
+		*port++ = 0;
+	} else if (addr[0] == '*') {
+		port = addr+1;
+	} else {
+		port = strrchr(strchr(addr, '/') ? : addr, ':');
+	}
+
+	if (is_port)
+		port = addr;
+
+	if (port && *port) {
+		if (*port == ':')
+			*port++ = 0;
+
+		if (*port && *port != '*') {
+			if (get_long(&a.port, port, 0)) {
+				struct servent *se1 = NULL;
+				struct servent *se2 = NULL;
+
+				if (current_filter.dbs&(1<<UDP_DB))
+					se1 = getservbyname(port, UDP_PROTO);
+				if (current_filter.dbs&(1<<TCP_DB))
+					se2 = getservbyname(port, TCP_PROTO);
+				if (se1 && se2 && se1->s_port != se2->s_port) {
+					fprintf(stderr, "Error: ambiguous port \"%s\".\n", port);
+					return NULL;
+				}
+				if (!se1)
+					se1 = se2;
+				if (se1) {
+					a.port = ntohs(se1->s_port);
+				} else {
+					struct scache *s;
+
+					for (s = rlist; s; s = s->next) {
+						if ((s->proto == UDP_PROTO &&
+						     (current_filter.dbs&(1<<UDP_DB))) ||
+						    (s->proto == TCP_PROTO &&
+						     (current_filter.dbs&(1<<TCP_DB)))) {
+							if (s->name && strcmp(s->name, port) == 0) {
+								if (a.port > 0 && a.port != s->port) {
+									fprintf(stderr, "Error: ambiguous port \"%s\".\n", port);
+									return NULL;
+								}
+								a.port = s->port;
+							}
+						}
+					}
+					if (a.port <= 0) {
+						fprintf(stderr, "Error: \"%s\" does not look like a port.\n", port);
+						return NULL;
+					}
+				}
+			}
+		}
+	}
+	if (!is_port && *addr && *addr != '*') {
+		if (get_prefix_1(&a.addr, addr, fam)) {
+			if (get_dns_host(&a, addr, fam)) {
+				fprintf(stderr, "Error: an inet prefix is expected rather than \"%s\".\n", addr);
+				return NULL;
+			}
+		}
+	}
+
+out:
+	if (fam != AF_UNSPEC) {
+		int states = f->states;
+		f->families = 0;
+		filter_af_set(f, fam);
+		filter_states_set(f, states);
+	}
+
+	res = malloc(sizeof(*res));
+	if (res)
+		memcpy(res, &a, sizeof(a));
+	return res;
+}
+
+void *parse_markmask(const char *markmask)
+{
+	struct aafilter a, *res;
+
+	if (strchr(markmask, '/')) {
+		if (sscanf(markmask, "%i/%i", &a.mark, &a.mask) != 2)
+			return NULL;
+	} else {
+		a.mask = 0xffffffff;
+		if (sscanf(markmask, "%i", &a.mark) != 1)
+			return NULL;
+	}
+
+	res = malloc(sizeof(*res));
+	if (res)
+		memcpy(res, &a, sizeof(a));
+	return res;
+}
+
+void *parse_cgroupcond(const char *path)
+{
+	struct aafilter *res;
+	__u64 id;
+
+	id = get_cgroup2_id(path);
+	if (!id)
+		return NULL;
+
+	res = malloc(sizeof(*res));
+	if (res)
+		res->cgroup_id = id;
+
+	return res;
+}
+
+static void proc_ctx_print(struct sockstat *s)
+{
+	char *buf;
+
+	if (show_proc_ctx || show_sock_ctx) {
+		if (find_entry(s->ino, &buf,
+				(show_proc_ctx & show_sock_ctx) ?
+				PROC_SOCK_CTX : PROC_CTX) > 0) {
+			out(" users:(%s)", buf);
+			free(buf);
+		}
+	} else if (show_processes || show_threads) {
+		if (find_entry(s->ino, &buf, USERS) > 0) {
+			out(" users:(%s)", buf);
+			free(buf);
+		}
+	}
+
+	field_next();
+}
+
+static void inet_stats_print(struct sockstat *s, bool v6only)
+{
+	sock_state_print(s);
+
+	inet_addr_print(&s->local, s->lport, s->iface, v6only);
+	inet_addr_print(&s->remote, s->rport, 0, v6only);
+
+	proc_ctx_print(s);
+}
+
+static int proc_parse_inet_addr(char *loc, char *rem, int family, struct
+		sockstat * s)
+{
+	s->local.family = s->remote.family = family;
+	if (family == AF_INET) {
+		sscanf(loc, "%x:%x", s->local.data, (unsigned *)&s->lport);
+		sscanf(rem, "%x:%x", s->remote.data, (unsigned *)&s->rport);
+		s->local.bytelen = s->remote.bytelen = 4;
+		return 0;
+	} else {
+		sscanf(loc, "%08x%08x%08x%08x:%x",
+		       s->local.data,
+		       s->local.data + 1,
+		       s->local.data + 2,
+		       s->local.data + 3,
+		       &s->lport);
+		sscanf(rem, "%08x%08x%08x%08x:%x",
+		       s->remote.data,
+		       s->remote.data + 1,
+		       s->remote.data + 2,
+		       s->remote.data + 3,
+		       &s->rport);
+		s->local.bytelen = s->remote.bytelen = 16;
+		return 0;
+	}
+	return -1;
+}
+
+static int proc_inet_split_line(char *line, char **loc, char **rem, char **data)
+{
+	char *p;
+
+	if ((p = strchr(line, ':')) == NULL)
+		return -1;
+
+	*loc = p+2;
+	if ((p = strchr(*loc, ':')) == NULL)
+		return -1;
+
+	p[5] = 0;
+	*rem = p+6;
+	if ((p = strchr(*rem, ':')) == NULL)
+		return -1;
+
+	p[5] = 0;
+	*data = p+6;
+	return 0;
+}
+
+/*
+ * Display bandwidth in standard units
+ * See: https://en.wikipedia.org/wiki/Data-rate_units
+ * bw is in bits per second
+ */
+static char *sprint_bw(char *buf, double bw)
+{
+	if (numeric)
+		sprintf(buf, "%.0f", bw);
+	else if (bw >= 1e12)
+		sprintf(buf, "%.3gT", bw / 1e12);
+	else if (bw >= 1e9)
+		sprintf(buf, "%.3gG", bw / 1e9);
+	else if (bw >= 1e6)
+		sprintf(buf, "%.3gM", bw / 1e6);
+	else if (bw >= 1e3)
+		sprintf(buf, "%.3gk", bw / 1e3);
+	else
+		sprintf(buf, "%g", bw);
+
+	return buf;
+}
+
+static void sctp_stats_print(struct sctp_info *s)
+{
+	if (s->sctpi_tag)
+		out(" tag:%x", s->sctpi_tag);
+	if (s->sctpi_state)
+		out(" state:%s", sctp_sstate_name[s->sctpi_state]);
+	if (s->sctpi_rwnd)
+		out(" rwnd:%d", s->sctpi_rwnd);
+	if (s->sctpi_unackdata)
+		out(" unackdata:%d", s->sctpi_unackdata);
+	if (s->sctpi_penddata)
+		out(" penddata:%d", s->sctpi_penddata);
+	if (s->sctpi_instrms)
+		out(" instrms:%d", s->sctpi_instrms);
+	if (s->sctpi_outstrms)
+		out(" outstrms:%d", s->sctpi_outstrms);
+	if (s->sctpi_inqueue)
+		out(" inqueue:%d", s->sctpi_inqueue);
+	if (s->sctpi_outqueue)
+		out(" outqueue:%d", s->sctpi_outqueue);
+	if (s->sctpi_overall_error)
+		out(" overerr:%d", s->sctpi_overall_error);
+	if (s->sctpi_max_burst)
+		out(" maxburst:%d", s->sctpi_max_burst);
+	if (s->sctpi_maxseg)
+		out(" maxseg:%d", s->sctpi_maxseg);
+	if (s->sctpi_peer_rwnd)
+		out(" prwnd:%d", s->sctpi_peer_rwnd);
+	if (s->sctpi_peer_tag)
+		out(" ptag:%x", s->sctpi_peer_tag);
+	if (s->sctpi_peer_capable)
+		out(" pcapable:%d", s->sctpi_peer_capable);
+	if (s->sctpi_peer_sack)
+		out(" psack:%d", s->sctpi_peer_sack);
+	if (s->sctpi_s_autoclose)
+		out(" autoclose:%d", s->sctpi_s_autoclose);
+	if (s->sctpi_s_adaptation_ind)
+		out(" adapind:%d", s->sctpi_s_adaptation_ind);
+	if (s->sctpi_s_pd_point)
+		out(" pdpoint:%d", s->sctpi_s_pd_point);
+	if (s->sctpi_s_nodelay)
+		out(" nodelay:%d", s->sctpi_s_nodelay);
+	if (s->sctpi_s_disable_fragments)
+		out(" nofrag:%d", s->sctpi_s_disable_fragments);
+	if (s->sctpi_s_v4mapped)
+		out(" v4mapped:%d", s->sctpi_s_v4mapped);
+	if (s->sctpi_s_frag_interleave)
+		out(" fraginl:%d", s->sctpi_s_frag_interleave);
+}
+
+static void tcp_stats_print(struct tcpstat *s)
+{
+	char b1[64];
+
+	if (s->has_ts_opt)
+		out(" ts");
+	if (s->has_usec_ts_opt)
+		out(" usec_ts");
+	if (s->has_sack_opt)
+		out(" sack");
+	if (s->has_ecn_opt)
+		out(" ecn");
+	if (s->has_ecnseen_opt)
+		out(" ecnseen");
+	if (s->has_fastopen_opt)
+		out(" fastopen");
+	if (s->cong_alg[0])
+		out(" %s", s->cong_alg);
+	if (s->has_wscale_opt)
+		out(" wscale:%d,%d", s->snd_wscale, s->rcv_wscale);
+	if (s->rto)
+		out(" rto:%g", s->rto);
+	if (s->backoff)
+		out(" backoff:%u", s->backoff);
+	if (s->rtt)
+		out(" rtt:%g/%g", s->rtt, s->rttvar);
+	if (s->ato)
+		out(" ato:%g", s->ato);
+
+	if (s->qack)
+		out(" qack:%d", s->qack);
+	if (s->qack & 1)
+		out(" bidir");
+
+	if (s->mss)
+		out(" mss:%d", s->mss);
+	if (s->pmtu)
+		out(" pmtu:%u", s->pmtu);
+	if (s->rcv_mss)
+		out(" rcvmss:%d", s->rcv_mss);
+	if (s->advmss)
+		out(" advmss:%d", s->advmss);
+	if (s->cwnd)
+		out(" cwnd:%u", s->cwnd);
+	if (s->ssthresh)
+		out(" ssthresh:%d", s->ssthresh);
+
+	if (s->bytes_sent)
+		out(" bytes_sent:%llu", s->bytes_sent);
+	if (s->bytes_retrans)
+		out(" bytes_retrans:%llu", s->bytes_retrans);
+	if (s->bytes_acked)
+		out(" bytes_acked:%llu", s->bytes_acked);
+	if (s->bytes_received)
+		out(" bytes_received:%llu", s->bytes_received);
+	if (s->segs_out)
+		out(" segs_out:%u", s->segs_out);
+	if (s->segs_in)
+		out(" segs_in:%u", s->segs_in);
+	if (s->data_segs_out)
+		out(" data_segs_out:%u", s->data_segs_out);
+	if (s->data_segs_in)
+		out(" data_segs_in:%u", s->data_segs_in);
+
+	if (s->dctcp && s->dctcp->enabled) {
+		struct dctcpstat *dctcp = s->dctcp;
+
+		out(" dctcp:(ce_state:%u,alpha:%u,ab_ecn:%u,ab_tot:%u)",
+			     dctcp->ce_state, dctcp->alpha, dctcp->ab_ecn,
+			     dctcp->ab_tot);
+	} else if (s->dctcp) {
+		out(" dctcp:fallback_mode");
+	}
+
+	if (s->bbr_info) {
+		__u64 bw;
+
+		bw = s->bbr_info->bbr_bw_hi;
+		bw <<= 32;
+		bw |= s->bbr_info->bbr_bw_lo;
+
+		out(" bbr:(bw:%sbps,mrtt:%g",
+		    sprint_bw(b1, bw * 8.0),
+		    (double)s->bbr_info->bbr_min_rtt / 1000.0);
+		if (s->bbr_info->bbr_pacing_gain)
+			out(",pacing_gain:%g",
+			    (double)s->bbr_info->bbr_pacing_gain / 256.0);
+		if (s->bbr_info->bbr_cwnd_gain)
+			out(",cwnd_gain:%g",
+			    (double)s->bbr_info->bbr_cwnd_gain / 256.0);
+		out(")");
+	}
+
+	if (s->send_bps)
+		out(" send %sbps", sprint_bw(b1, s->send_bps));
+	if (s->lastsnd)
+		out(" lastsnd:%u", s->lastsnd);
+	if (s->lastrcv)
+		out(" lastrcv:%u", s->lastrcv);
+	if (s->lastack)
+		out(" lastack:%u", s->lastack);
+
+	if (s->pacing_rate) {
+		out(" pacing_rate %sbps", sprint_bw(b1, s->pacing_rate));
+		if (s->pacing_rate_max)
+			out("/%sbps", sprint_bw(b1, s->pacing_rate_max));
+	}
+
+	if (s->delivery_rate)
+		out(" delivery_rate %sbps", sprint_bw(b1, s->delivery_rate));
+	if (s->delivered)
+		out(" delivered:%u", s->delivered);
+	if (s->delivered_ce)
+		out(" delivered_ce:%u", s->delivered_ce);
+	if (s->app_limited)
+		out(" app_limited");
+
+	if (s->busy_time) {
+		out(" busy:%llums", s->busy_time / 1000);
+		if (s->rwnd_limited)
+			out(" rwnd_limited:%llums(%.1f%%)",
+			    s->rwnd_limited / 1000,
+			    100.0 * s->rwnd_limited / s->busy_time);
+		if (s->sndbuf_limited)
+			out(" sndbuf_limited:%llums(%.1f%%)",
+			    s->sndbuf_limited / 1000,
+			    100.0 * s->sndbuf_limited / s->busy_time);
+	}
+
+	if (s->unacked)
+		out(" unacked:%u", s->unacked);
+	if (s->retrans || s->retrans_total)
+		out(" retrans:%u/%u", s->retrans, s->retrans_total);
+	if (s->lost)
+		out(" lost:%u", s->lost);
+	if (s->sacked && s->ss.state != SS_LISTEN)
+		out(" sacked:%u", s->sacked);
+	if (s->dsack_dups)
+		out(" dsack_dups:%u", s->dsack_dups);
+	if (s->fackets)
+		out(" fackets:%u", s->fackets);
+	if (s->reordering != 3)
+		out(" reordering:%d", s->reordering);
+	if (s->reord_seen)
+		out(" reord_seen:%d", s->reord_seen);
+	if (s->rcv_rtt)
+		out(" rcv_rtt:%g", s->rcv_rtt);
+	if (s->rcv_space)
+		out(" rcv_space:%d", s->rcv_space);
+	if (s->rcv_ssthresh)
+		out(" rcv_ssthresh:%u", s->rcv_ssthresh);
+	if (s->not_sent)
+		out(" notsent:%u", s->not_sent);
+	if (s->min_rtt)
+		out(" minrtt:%g", s->min_rtt);
+	if (s->rcv_ooopack)
+		out(" rcv_ooopack:%u", s->rcv_ooopack);
+	if (s->snd_wnd)
+		out(" snd_wnd:%u", s->snd_wnd);
+	if (s->rcv_wnd)
+		out(" rcv_wnd:%u", s->rcv_wnd);
+	if (s->rehash)
+		out(" rehash:%u", s->rehash);
+}
+
+static void tcp_timer_print(struct tcpstat *s)
+{
+	static const char * const tmr_name[] = {
+		"off",
+		"on",
+		"keepalive",
+		"timewait",
+		"persist",
+		"unknown"
+	};
+
+	if (s->timer) {
+		if (s->timer > 4)
+			s->timer = 5;
+		out(" timer:(%s,%s,%d)",
+			     tmr_name[s->timer],
+			     print_ms_timer(s->timeout),
+			     s->retrans);
+	}
+}
+
+static void sctp_timer_print(struct tcpstat *s)
+{
+	if (s->timer)
+		out(" timer:(T3_RTX,%s,%d)",
+		    print_ms_timer(s->timeout), s->retrans);
+}
+
+static int tcp_show_line(char *line, const struct filter *f, int family)
+{
+	int rto = 0, ato = 0;
+	struct tcpstat s = {};
+	char *loc, *rem, *data;
+	char opt[256];
+	int n;
+	int hz = get_user_hz();
+
+	if (proc_inet_split_line(line, &loc, &rem, &data))
+		return -1;
+
+	int state = (data[1] >= 'A') ? (data[1] - 'A' + 10) : (data[1] - '0');
+
+	if (!(f->states & (1 << state)))
+		return 0;
+
+	proc_parse_inet_addr(loc, rem, family, &s.ss);
+
+	if (f->f && run_ssfilter(f->f, &s.ss) == 0)
+		return 0;
+
+	opt[0] = 0;
+	n = sscanf(data, "%x %x:%x %x:%x %x %d %d %u %d %llx %d %d %d %u %d %[^\n]\n",
+		   &s.ss.state, &s.ss.wq, &s.ss.rq,
+		   &s.timer, &s.timeout, &s.retrans, &s.ss.uid, &s.probes,
+		   &s.ss.ino, &s.ss.refcnt, &s.ss.sk, &rto, &ato, &s.qack, &s.cwnd,
+		   &s.ssthresh, opt);
+
+	if (n < 17)
+		opt[0] = 0;
+
+	if (n < 12) {
+		rto = 0;
+		s.cwnd = 2;
+		s.ssthresh = -1;
+		ato = s.qack = 0;
+	}
+
+	s.retrans   = s.timer != 1 ? s.probes : s.retrans;
+	s.timeout   = (s.timeout * 1000 + hz - 1) / hz;
+	s.ato	    = (double)ato / hz;
+	s.qack	   /= 2;
+	s.rto	    = (double)rto;
+	s.ssthresh  = s.ssthresh == -1 ? 0 : s.ssthresh;
+	s.rto	    = s.rto != 3 * hz  ? s.rto / hz : 0;
+	s.ss.type   = IPPROTO_TCP;
+
+	inet_stats_print(&s.ss, false);
+
+	if (show_options)
+		tcp_timer_print(&s);
+
+	if (show_details) {
+		sock_details_print(&s.ss);
+		if (opt[0])
+			out(" opt:\"%s\"", opt);
+	}
+
+	if (show_tcpinfo)
+		tcp_stats_print(&s);
+
+	return 0;
+}
+
+static int generic_record_read(FILE *fp,
+			       int (*worker)(char*, const struct filter *, int),
+			       const struct filter *f, int fam)
+{
+	char line[256];
+
+	/* skip header */
+	if (fgets(line, sizeof(line), fp) == NULL)
+		goto outerr;
+
+	while (fgets(line, sizeof(line), fp) != NULL) {
+		int n = strlen(line);
+
+		if (n == 0 || line[n-1] != '\n') {
+			errno = -EINVAL;
+			return -1;
+		}
+		line[n-1] = 0;
+
+		if (worker(line, f, fam) < 0)
+			return 0;
+	}
+outerr:
+
+	return ferror(fp) ? -1 : 0;
+}
+
+static void print_skmeminfo(struct rtattr *tb[], int attrtype)
+{
+	const __u32 *skmeminfo;
+
+	if (!tb[attrtype]) {
+		if (attrtype == INET_DIAG_SKMEMINFO) {
+			if (!tb[INET_DIAG_MEMINFO])
+				return;
+
+			const struct inet_diag_meminfo *minfo =
+				RTA_DATA(tb[INET_DIAG_MEMINFO]);
+
+			out(" mem:(r%u,w%u,f%u,t%u)",
+				   minfo->idiag_rmem,
+				   minfo->idiag_wmem,
+				   minfo->idiag_fmem,
+				   minfo->idiag_tmem);
+		}
+		return;
+	}
+
+	skmeminfo = RTA_DATA(tb[attrtype]);
+
+	out(" skmem:(r%u,rb%u,t%u,tb%u,f%u,w%u,o%u",
+		     skmeminfo[SK_MEMINFO_RMEM_ALLOC],
+		     skmeminfo[SK_MEMINFO_RCVBUF],
+		     skmeminfo[SK_MEMINFO_WMEM_ALLOC],
+		     skmeminfo[SK_MEMINFO_SNDBUF],
+		     skmeminfo[SK_MEMINFO_FWD_ALLOC],
+		     skmeminfo[SK_MEMINFO_WMEM_QUEUED],
+		     skmeminfo[SK_MEMINFO_OPTMEM]);
+
+	if (RTA_PAYLOAD(tb[attrtype]) >=
+		(SK_MEMINFO_BACKLOG + 1) * sizeof(__u32))
+		out(",bl%u", skmeminfo[SK_MEMINFO_BACKLOG]);
+
+	if (RTA_PAYLOAD(tb[attrtype]) >=
+		(SK_MEMINFO_DROPS + 1) * sizeof(__u32))
+		out(",d%u", skmeminfo[SK_MEMINFO_DROPS]);
+
+	out(")");
+}
+
+/* like lib/utils.c print_escape_buf(), but use out(), not printf()! */
+static void out_escape_buf(const __u8 *buf, size_t len, const char *escape)
+{
+	size_t i;
+
+	for (i = 0; i < len; ++i) {
+		if (isprint(buf[i]) && buf[i] != '\\' &&
+		    !strchr(escape, buf[i]))
+			out("%c", buf[i]);
+		else
+			out("\\%03o", buf[i]);
+	}
+}
+
+static void print_md5sig(struct tcp_diag_md5sig *sig)
+{
+	out("%s/%d=",
+	    format_host(sig->tcpm_family,
+			sig->tcpm_family == AF_INET6 ? 16 : 4,
+			&sig->tcpm_addr),
+	    sig->tcpm_prefixlen);
+	out_escape_buf(sig->tcpm_key, sig->tcpm_keylen, " ,");
+}
+
+static void tcp_tls_version(struct rtattr *attr)
+{
+	u_int16_t val;
+
+	if (!attr)
+		return;
+	val = rta_getattr_u16(attr);
+
+	switch (val) {
+	case TLS_1_2_VERSION:
+		out(" version: 1.2");
+		break;
+	case TLS_1_3_VERSION:
+		out(" version: 1.3");
+		break;
+	default:
+		out(" version: unknown(%hu)", val);
+		break;
+	}
+}
+
+static void tcp_tls_cipher(struct rtattr *attr)
+{
+	u_int16_t val;
+
+	if (!attr)
+		return;
+	val = rta_getattr_u16(attr);
+
+	switch (val) {
+	case TLS_CIPHER_AES_GCM_128:
+		out(" cipher: aes-gcm-128");
+		break;
+	case TLS_CIPHER_AES_GCM_256:
+		out(" cipher: aes-gcm-256");
+		break;
+	}
+}
+
+static void tcp_tls_conf(const char *name, struct rtattr *attr)
+{
+	u_int16_t val;
+
+	if (!attr)
+		return;
+	val = rta_getattr_u16(attr);
+
+	switch (val) {
+	case TLS_CONF_BASE:
+		out(" %s: none", name);
+		break;
+	case TLS_CONF_SW:
+		out(" %s: sw", name);
+		break;
+	case TLS_CONF_HW:
+		out(" %s: hw", name);
+		break;
+	case TLS_CONF_HW_RECORD:
+		out(" %s: hw-record", name);
+		break;
+	default:
+		out(" %s: unknown(%hu)", name, val);
+		break;
+	}
+}
+
+static void mptcp_subflow_info(struct rtattr *tb[])
+{
+	u_int32_t flags = 0;
+
+	if (tb[MPTCP_SUBFLOW_ATTR_FLAGS]) {
+		char caps[32 + 1] = { 0 }, *cap = &caps[0];
+
+		flags = rta_getattr_u32(tb[MPTCP_SUBFLOW_ATTR_FLAGS]);
+
+		if (flags & MPTCP_SUBFLOW_FLAG_MCAP_REM)
+			*cap++ = 'M';
+		if (flags & MPTCP_SUBFLOW_FLAG_MCAP_LOC)
+			*cap++ = 'm';
+		if (flags & MPTCP_SUBFLOW_FLAG_JOIN_REM)
+			*cap++ = 'J';
+		if (flags & MPTCP_SUBFLOW_FLAG_JOIN_LOC)
+			*cap++ = 'j';
+		if (flags & MPTCP_SUBFLOW_FLAG_BKUP_REM)
+			*cap++ = 'B';
+		if (flags & MPTCP_SUBFLOW_FLAG_BKUP_LOC)
+			*cap++ = 'b';
+		if (flags & MPTCP_SUBFLOW_FLAG_FULLY_ESTABLISHED)
+			*cap++ = 'e';
+		if (flags & MPTCP_SUBFLOW_FLAG_CONNECTED)
+			*cap++ = 'c';
+		if (flags & MPTCP_SUBFLOW_FLAG_MAPVALID)
+			*cap++ = 'v';
+		if (flags)
+			out(" flags:%s", caps);
+	}
+	if (tb[MPTCP_SUBFLOW_ATTR_TOKEN_REM] &&
+	    tb[MPTCP_SUBFLOW_ATTR_TOKEN_LOC] &&
+	    tb[MPTCP_SUBFLOW_ATTR_ID_REM] &&
+	    tb[MPTCP_SUBFLOW_ATTR_ID_LOC])
+		out(" token:%04x(id:%hhu)/%04x(id:%hhu)",
+		    rta_getattr_u32(tb[MPTCP_SUBFLOW_ATTR_TOKEN_REM]),
+		    rta_getattr_u8(tb[MPTCP_SUBFLOW_ATTR_ID_REM]),
+		    rta_getattr_u32(tb[MPTCP_SUBFLOW_ATTR_TOKEN_LOC]),
+		    rta_getattr_u8(tb[MPTCP_SUBFLOW_ATTR_ID_LOC]));
+	if (tb[MPTCP_SUBFLOW_ATTR_MAP_SEQ])
+		out(" seq:%llx",
+		    rta_getattr_u64(tb[MPTCP_SUBFLOW_ATTR_MAP_SEQ]));
+	if (tb[MPTCP_SUBFLOW_ATTR_MAP_SFSEQ])
+		out(" sfseq:%x",
+		    rta_getattr_u32(tb[MPTCP_SUBFLOW_ATTR_MAP_SFSEQ]));
+	if (tb[MPTCP_SUBFLOW_ATTR_SSN_OFFSET])
+		out(" ssnoff:%x",
+		    rta_getattr_u32(tb[MPTCP_SUBFLOW_ATTR_SSN_OFFSET]));
+	if (tb[MPTCP_SUBFLOW_ATTR_MAP_DATALEN])
+		out(" maplen:%x",
+		    rta_getattr_u32(tb[MPTCP_SUBFLOW_ATTR_MAP_DATALEN]));
+}
+
+#define TCPI_HAS_OPT(info, opt) !!(info->tcpi_options & (opt))
+
+static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
+		struct rtattr *tb[])
+{
+	double rtt = 0;
+	struct tcpstat s = {};
+
+	s.ss.state = r->idiag_state;
+
+	print_skmeminfo(tb, INET_DIAG_SKMEMINFO);
+
+	if (tb[INET_DIAG_INFO]) {
+		struct tcp_info *info;
+		int len = RTA_PAYLOAD(tb[INET_DIAG_INFO]);
+
+		/* workaround for older kernels with less fields */
+		if (len < sizeof(*info)) {
+			info = alloca(sizeof(*info));
+			memcpy(info, RTA_DATA(tb[INET_DIAG_INFO]), len);
+			memset((char *)info + len, 0, sizeof(*info) - len);
+		} else
+			info = RTA_DATA(tb[INET_DIAG_INFO]);
+
+		if (show_options) {
+			s.has_ts_opt	   = TCPI_HAS_OPT(info, TCPI_OPT_TIMESTAMPS);
+			s.has_usec_ts_opt  = TCPI_HAS_OPT(info, TCPI_OPT_USEC_TS);
+			s.has_sack_opt	   = TCPI_HAS_OPT(info, TCPI_OPT_SACK);
+			s.has_ecn_opt	   = TCPI_HAS_OPT(info, TCPI_OPT_ECN);
+			s.has_ecnseen_opt  = TCPI_HAS_OPT(info, TCPI_OPT_ECN_SEEN);
+			s.has_fastopen_opt = TCPI_HAS_OPT(info, TCPI_OPT_SYN_DATA);
+		}
+
+		if (tb[INET_DIAG_CONG])
+			strncpy(s.cong_alg,
+				rta_getattr_str(tb[INET_DIAG_CONG]),
+				sizeof(s.cong_alg) - 1);
+
+		if (TCPI_HAS_OPT(info, TCPI_OPT_WSCALE)) {
+			s.has_wscale_opt  = true;
+			s.snd_wscale	  = info->tcpi_snd_wscale;
+			s.rcv_wscale	  = info->tcpi_rcv_wscale;
+		}
+
+		if (info->tcpi_rto && info->tcpi_rto != 3000000)
+			s.rto = (double)info->tcpi_rto / 1000;
+
+		s.backoff	 = info->tcpi_backoff;
+		s.rtt		 = (double)info->tcpi_rtt / 1000;
+		s.rttvar	 = (double)info->tcpi_rttvar / 1000;
+		s.ato		 = (double)info->tcpi_ato / 1000;
+		s.mss		 = info->tcpi_snd_mss;
+		s.rcv_mss	 = info->tcpi_rcv_mss;
+		s.advmss	 = info->tcpi_advmss;
+		s.rcv_space	 = info->tcpi_rcv_space;
+		s.rcv_rtt	 = (double)info->tcpi_rcv_rtt / 1000;
+		s.lastsnd	 = info->tcpi_last_data_sent;
+		s.lastrcv	 = info->tcpi_last_data_recv;
+		s.lastack	 = info->tcpi_last_ack_recv;
+		s.unacked	 = info->tcpi_unacked;
+		s.retrans	 = info->tcpi_retrans;
+		s.retrans_total  = info->tcpi_total_retrans;
+		s.lost		 = info->tcpi_lost;
+		s.sacked	 = info->tcpi_sacked;
+		s.fackets	 = info->tcpi_fackets;
+		s.reordering	 = info->tcpi_reordering;
+		s.rcv_ssthresh   = info->tcpi_rcv_ssthresh;
+		s.cwnd		 = info->tcpi_snd_cwnd;
+		s.pmtu		 = info->tcpi_pmtu;
+
+		if (info->tcpi_snd_ssthresh < 0xFFFF)
+			s.ssthresh = info->tcpi_snd_ssthresh;
+
+		rtt = (double) info->tcpi_rtt;
+		if (tb[INET_DIAG_VEGASINFO]) {
+			const struct tcpvegas_info *vinfo
+				= RTA_DATA(tb[INET_DIAG_VEGASINFO]);
+
+			if (vinfo->tcpv_enabled &&
+					vinfo->tcpv_rtt && vinfo->tcpv_rtt != 0x7fffffff)
+				rtt =  vinfo->tcpv_rtt;
+		}
+
+		if (tb[INET_DIAG_DCTCPINFO]) {
+			struct dctcpstat *dctcp = malloc(sizeof(struct
+						dctcpstat));
+
+			const struct tcp_dctcp_info *dinfo
+				= RTA_DATA(tb[INET_DIAG_DCTCPINFO]);
+
+			dctcp->enabled	= !!dinfo->dctcp_enabled;
+			dctcp->ce_state = dinfo->dctcp_ce_state;
+			dctcp->alpha	= dinfo->dctcp_alpha;
+			dctcp->ab_ecn	= dinfo->dctcp_ab_ecn;
+			dctcp->ab_tot	= dinfo->dctcp_ab_tot;
+			s.dctcp		= dctcp;
+		}
+
+		if (tb[INET_DIAG_BBRINFO]) {
+			const void *bbr_info = RTA_DATA(tb[INET_DIAG_BBRINFO]);
+			int len = min(RTA_PAYLOAD(tb[INET_DIAG_BBRINFO]),
+				      sizeof(*s.bbr_info));
+
+			s.bbr_info = calloc(1, sizeof(*s.bbr_info));
+			if (s.bbr_info && bbr_info)
+				memcpy(s.bbr_info, bbr_info, len);
+		}
+
+		if (rtt > 0 && info->tcpi_snd_mss && info->tcpi_snd_cwnd) {
+			s.send_bps = (double) info->tcpi_snd_cwnd *
+				(double)info->tcpi_snd_mss * 8000000. / rtt;
+		}
+
+		if (info->tcpi_pacing_rate &&
+				info->tcpi_pacing_rate != ~0ULL) {
+			s.pacing_rate = info->tcpi_pacing_rate * 8.;
+
+			if (info->tcpi_max_pacing_rate &&
+					info->tcpi_max_pacing_rate != ~0ULL)
+				s.pacing_rate_max = info->tcpi_max_pacing_rate * 8.;
+		}
+		s.bytes_acked = info->tcpi_bytes_acked;
+		s.bytes_received = info->tcpi_bytes_received;
+		s.segs_out = info->tcpi_segs_out;
+		s.segs_in = info->tcpi_segs_in;
+		s.data_segs_out = info->tcpi_data_segs_out;
+		s.data_segs_in = info->tcpi_data_segs_in;
+		s.not_sent = info->tcpi_notsent_bytes;
+		if (info->tcpi_min_rtt && info->tcpi_min_rtt != ~0U)
+			s.min_rtt = (double) info->tcpi_min_rtt / 1000;
+		s.delivery_rate = info->tcpi_delivery_rate * 8.;
+		s.app_limited = info->tcpi_delivery_rate_app_limited;
+		s.busy_time = info->tcpi_busy_time;
+		s.rwnd_limited = info->tcpi_rwnd_limited;
+		s.sndbuf_limited = info->tcpi_sndbuf_limited;
+		s.delivered = info->tcpi_delivered;
+		s.delivered_ce = info->tcpi_delivered_ce;
+		s.dsack_dups = info->tcpi_dsack_dups;
+		s.reord_seen = info->tcpi_reord_seen;
+		s.bytes_sent = info->tcpi_bytes_sent;
+		s.bytes_retrans = info->tcpi_bytes_retrans;
+		s.rcv_ooopack = info->tcpi_rcv_ooopack;
+		s.snd_wnd = info->tcpi_snd_wnd;
+		s.rcv_wnd = info->tcpi_rcv_wnd;
+		s.rehash = info->tcpi_rehash;
+		tcp_stats_print(&s);
+		free(s.dctcp);
+		free(s.bbr_info);
+	}
+	if (tb[INET_DIAG_MD5SIG]) {
+		struct tcp_diag_md5sig *sig = RTA_DATA(tb[INET_DIAG_MD5SIG]);
+		int len = RTA_PAYLOAD(tb[INET_DIAG_MD5SIG]);
+
+		out(" md5keys:");
+		print_md5sig(sig++);
+		for (len -= sizeof(*sig); len > 0; len -= sizeof(*sig)) {
+			out(",");
+			print_md5sig(sig++);
+		}
+	}
+	if (tb[INET_DIAG_ULP_INFO]) {
+		struct rtattr *ulpinfo[INET_ULP_INFO_MAX + 1] = { 0 };
+
+		parse_rtattr_nested(ulpinfo, INET_ULP_INFO_MAX,
+				    tb[INET_DIAG_ULP_INFO]);
+
+		if (ulpinfo[INET_ULP_INFO_NAME])
+			out(" tcp-ulp-%s",
+			    rta_getattr_str(ulpinfo[INET_ULP_INFO_NAME]));
+
+		if (ulpinfo[INET_ULP_INFO_TLS]) {
+			struct rtattr *tlsinfo[TLS_INFO_MAX + 1] = { 0 };
+
+			parse_rtattr_nested(tlsinfo, TLS_INFO_MAX,
+					    ulpinfo[INET_ULP_INFO_TLS]);
+
+			tcp_tls_version(tlsinfo[TLS_INFO_VERSION]);
+			tcp_tls_cipher(tlsinfo[TLS_INFO_CIPHER]);
+			tcp_tls_conf("rxconf", tlsinfo[TLS_INFO_RXCONF]);
+			tcp_tls_conf("txconf", tlsinfo[TLS_INFO_TXCONF]);
+			if (!!tlsinfo[TLS_INFO_ZC_RO_TX])
+				out(" zc_ro_tx");
+			if (!!tlsinfo[TLS_INFO_RX_NO_PAD])
+				out(" no_pad_rx");
+		}
+		if (ulpinfo[INET_ULP_INFO_MPTCP]) {
+			struct rtattr *sfinfo[MPTCP_SUBFLOW_ATTR_MAX + 1] =
+				{ 0 };
+
+			parse_rtattr_nested(sfinfo, MPTCP_SUBFLOW_ATTR_MAX,
+					    ulpinfo[INET_ULP_INFO_MPTCP]);
+			mptcp_subflow_info(sfinfo);
+		}
+	}
+}
+
+static void mptcp_stats_print(struct mptcp_info *s)
+{
+	if (s->mptcpi_subflows)
+		out(" subflows:%u", s->mptcpi_subflows);
+	if (s->mptcpi_add_addr_signal)
+		out(" add_addr_signal:%u", s->mptcpi_add_addr_signal);
+	if (s->mptcpi_add_addr_accepted)
+		out(" add_addr_accepted:%u", s->mptcpi_add_addr_accepted);
+	if (s->mptcpi_subflows_max)
+		out(" subflows_max:%u", s->mptcpi_subflows_max);
+	if (s->mptcpi_add_addr_signal_max)
+		out(" add_addr_signal_max:%u", s->mptcpi_add_addr_signal_max);
+	if (s->mptcpi_add_addr_accepted_max)
+		out(" add_addr_accepted_max:%u", s->mptcpi_add_addr_accepted_max);
+	if (s->mptcpi_flags & MPTCP_INFO_FLAG_FALLBACK)
+		out(" fallback");
+	if (s->mptcpi_flags & MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED)
+		out(" remote_key");
+	if (s->mptcpi_token)
+		out(" token:%x", s->mptcpi_token);
+	if (s->mptcpi_write_seq)
+		out(" write_seq:%llu", s->mptcpi_write_seq);
+	if (s->mptcpi_snd_una)
+		out(" snd_una:%llu", s->mptcpi_snd_una);
+	if (s->mptcpi_rcv_nxt)
+		out(" rcv_nxt:%llu", s->mptcpi_rcv_nxt);
+	if (s->mptcpi_local_addr_used)
+		out(" local_addr_used:%u", s->mptcpi_local_addr_used);
+	if (s->mptcpi_local_addr_max)
+		out(" local_addr_max:%u", s->mptcpi_local_addr_max);
+	if (s->mptcpi_csum_enabled)
+		out(" csum_enabled:%u", s->mptcpi_csum_enabled);
+	if (s->mptcpi_retransmits)
+		out(" retransmits:%u", s->mptcpi_retransmits);
+	if (s->mptcpi_bytes_retrans)
+		out(" bytes_retrans:%llu", s->mptcpi_bytes_retrans);
+	if (s->mptcpi_bytes_sent)
+		out(" bytes_sent:%llu", s->mptcpi_bytes_sent);
+	if (s->mptcpi_bytes_received)
+		out(" bytes_received:%llu", s->mptcpi_bytes_received);
+	if (s->mptcpi_bytes_acked)
+		out(" bytes_acked:%llu", s->mptcpi_bytes_acked);
+	if (s->mptcpi_subflows_total)
+		out(" subflows_total:%u", s->mptcpi_subflows_total);
+}
+
+static void mptcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
+			    struct rtattr *tb[])
+{
+	print_skmeminfo(tb, INET_DIAG_SKMEMINFO);
+
+	if (tb[INET_DIAG_INFO]) {
+		struct mptcp_info *info;
+		int len = RTA_PAYLOAD(tb[INET_DIAG_INFO]);
+
+		/* workaround for older kernels with less fields */
+		if (len < sizeof(*info)) {
+			info = alloca(sizeof(*info));
+			memcpy(info, RTA_DATA(tb[INET_DIAG_INFO]), len);
+			memset((char *)info + len, 0, sizeof(*info) - len);
+		} else
+			info = RTA_DATA(tb[INET_DIAG_INFO]);
+
+		mptcp_stats_print(info);
+	}
+}
+
+static const char *format_host_sa(struct sockaddr_storage *sa)
+{
+	union {
+		struct sockaddr_in sin;
+		struct sockaddr_in6 sin6;
+	} *saddr = (void *)sa;
+
+	switch (sa->ss_family) {
+	case AF_INET:
+		return format_host(AF_INET, 4, &saddr->sin.sin_addr);
+	case AF_INET6:
+		return format_host(AF_INET6, 16, &saddr->sin6.sin6_addr);
+	default:
+		return "";
+	}
+}
+
+static void sctp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
+		struct rtattr *tb[])
+{
+	struct sockaddr_storage *sa;
+	int len;
+
+	print_skmeminfo(tb, INET_DIAG_SKMEMINFO);
+
+	if (tb[INET_DIAG_LOCALS]) {
+		len = RTA_PAYLOAD(tb[INET_DIAG_LOCALS]);
+		sa = RTA_DATA(tb[INET_DIAG_LOCALS]);
+
+		out(" locals:%s", format_host_sa(sa));
+		for (sa++, len -= sizeof(*sa); len > 0; sa++, len -= sizeof(*sa))
+			out(",%s", format_host_sa(sa));
+
+	}
+	if (tb[INET_DIAG_PEERS]) {
+		len = RTA_PAYLOAD(tb[INET_DIAG_PEERS]);
+		sa = RTA_DATA(tb[INET_DIAG_PEERS]);
+
+		out(" peers:%s", format_host_sa(sa));
+		for (sa++, len -= sizeof(*sa); len > 0; sa++, len -= sizeof(*sa))
+			out(",%s", format_host_sa(sa));
+	}
+	if (tb[INET_DIAG_INFO]) {
+		struct sctp_info *info;
+		len = RTA_PAYLOAD(tb[INET_DIAG_INFO]);
+
+		/* workaround for older kernels with less fields */
+		if (len < sizeof(*info)) {
+			info = alloca(sizeof(*info));
+			memcpy(info, RTA_DATA(tb[INET_DIAG_INFO]), len);
+			memset((char *)info + len, 0, sizeof(*info) - len);
+		} else
+			info = RTA_DATA(tb[INET_DIAG_INFO]);
+
+		sctp_stats_print(info);
+	}
+}
+
+static void parse_diag_msg(struct nlmsghdr *nlh, struct sockstat *s)
+{
+	struct rtattr *tb[INET_DIAG_MAX+1];
+	struct inet_diag_msg *r = NLMSG_DATA(nlh);
+
+	parse_rtattr(tb, INET_DIAG_MAX, (struct rtattr *)(r+1),
+		     nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
+
+	s->state	= r->idiag_state;
+	s->local.family	= s->remote.family = r->idiag_family;
+	s->lport	= ntohs(r->id.idiag_sport);
+	s->rport	= ntohs(r->id.idiag_dport);
+	s->wq		= r->idiag_wqueue;
+	s->rq		= r->idiag_rqueue;
+	s->ino		= r->idiag_inode;
+	s->uid		= r->idiag_uid;
+	s->iface	= r->id.idiag_if;
+	s->sk		= cookie_sk_get(&r->id.idiag_cookie[0]);
+
+	s->mark = 0;
+	if (tb[INET_DIAG_MARK])
+		s->mark = rta_getattr_u32(tb[INET_DIAG_MARK]);
+	s->cgroup_id = 0;
+	if (tb[INET_DIAG_CGROUP_ID])
+		s->cgroup_id = rta_getattr_u64(tb[INET_DIAG_CGROUP_ID]);
+	if (tb[INET_DIAG_PROTOCOL])
+		s->raw_prot = rta_getattr_u8(tb[INET_DIAG_PROTOCOL]);
+	else
+		s->raw_prot = 0;
+
+	if (s->local.family == AF_INET)
+		s->local.bytelen = s->remote.bytelen = 4;
+	else
+		s->local.bytelen = s->remote.bytelen = 16;
+
+	memcpy(s->local.data, r->id.idiag_src, s->local.bytelen);
+	memcpy(s->remote.data, r->id.idiag_dst, s->local.bytelen);
+}
+
+static int inet_show_sock(struct nlmsghdr *nlh,
+			  struct sockstat *s)
+{
+	struct rtattr *tb[INET_DIAG_MAX+1];
+	struct inet_diag_msg *r = NLMSG_DATA(nlh);
+	unsigned char v6only = 0;
+
+	parse_rtattr(tb, INET_DIAG_MAX, (struct rtattr *)(r+1),
+		     nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
+
+	if (tb[INET_DIAG_PROTOCOL])
+		s->type = rta_getattr_u8(tb[INET_DIAG_PROTOCOL]);
+
+	if (s->local.family == AF_INET6 && tb[INET_DIAG_SKV6ONLY])
+		v6only = rta_getattr_u8(tb[INET_DIAG_SKV6ONLY]);
+
+	inet_stats_print(s, v6only);
+
+	if (show_options) {
+		struct tcpstat t = {};
+
+		t.timer = r->idiag_timer;
+		t.timeout = r->idiag_expires;
+		t.retrans = r->idiag_retrans;
+		if (s->type == IPPROTO_SCTP)
+			sctp_timer_print(&t);
+		else
+			tcp_timer_print(&t);
+	}
+
+	if (show_details) {
+		sock_details_print(s);
+		if (s->local.family == AF_INET6 && tb[INET_DIAG_SKV6ONLY])
+			out(" v6only:%u", v6only);
+
+		if (tb[INET_DIAG_SHUTDOWN]) {
+			unsigned char mask;
+
+			mask = rta_getattr_u8(tb[INET_DIAG_SHUTDOWN]);
+			out(" %c-%c",
+			    mask & 1 ? '-' : '<', mask & 2 ? '-' : '>');
+		}
+	}
+
+	if (show_tos) {
+		if (tb[INET_DIAG_TOS])
+			out(" tos:%#x", rta_getattr_u8(tb[INET_DIAG_TOS]));
+		if (tb[INET_DIAG_TCLASS])
+			out(" tclass:%#x", rta_getattr_u8(tb[INET_DIAG_TCLASS]));
+		if (tb[INET_DIAG_CLASS_ID])
+			out(" class_id:%#x", rta_getattr_u32(tb[INET_DIAG_CLASS_ID]));
+	}
+
+	if (show_cgroup) {
+		if (tb[INET_DIAG_CGROUP_ID])
+			out(" cgroup:%s", cg_id_to_path(rta_getattr_u64(tb[INET_DIAG_CGROUP_ID])));
+	}
+
+	if (show_inet_sockopt) {
+		if (tb[INET_DIAG_SOCKOPT] && RTA_PAYLOAD(tb[INET_DIAG_SOCKOPT]) >=
+		    sizeof(struct inet_diag_sockopt)) {
+			const struct inet_diag_sockopt *sockopt =
+					RTA_DATA(tb[INET_DIAG_SOCKOPT]);
+			if (!oneline)
+				out("\n\tinet-sockopt: (");
+			else
+				out(" inet-sockopt: (");
+			if (sockopt->recverr)
+				out(" recverr");
+			if (sockopt->is_icsk)
+				out(" is_icsk");
+			if (sockopt->freebind)
+				out(" freebind");
+			if (sockopt->hdrincl)
+				out(" hdrincl");
+			if (sockopt->mc_loop)
+				out(" mc_loop");
+			if (sockopt->transparent)
+				out(" transparent");
+			if (sockopt->mc_all)
+				out(" mc_all");
+			if (sockopt->nodefrag)
+				out(" nodefrag");
+			if (sockopt->bind_address_no_port)
+				out(" bind_addr_no_port");
+			if (sockopt->recverr_rfc4884)
+				out(" recverr_rfc4884");
+			if (sockopt->defer_connect)
+				out(" defer_connect");
+			out(")");
+		}
+	}
+
+	if (show_mem || (show_tcpinfo && s->type != IPPROTO_UDP)) {
+		if (!oneline)
+			out("\n\t");
+		if (s->type == IPPROTO_SCTP)
+			sctp_show_info(nlh, r, tb);
+		else if (s->type == IPPROTO_MPTCP)
+			mptcp_show_info(nlh, r, tb);
+		else
+			tcp_show_info(nlh, r, tb);
+	}
+	sctp_ino = s->ino;
+
+	return 0;
+}
+
+static int tcpdiag_send(int fd, int protocol, struct filter *f)
+{
+	struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
+	struct {
+		struct nlmsghdr nlh;
+		struct inet_diag_req r;
+	} req = {
+		.nlh.nlmsg_len = sizeof(req),
+		.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST,
+		.nlh.nlmsg_seq = MAGIC_SEQ,
+		.r.idiag_family = AF_INET,
+		.r.idiag_states = f->states,
+	};
+	char    *bc = NULL;
+	int	bclen;
+	struct msghdr msg;
+	struct rtattr rta;
+	struct iovec iov[3];
+	int iovlen = 1;
+
+	if (protocol == IPPROTO_TCP)
+		req.nlh.nlmsg_type = TCPDIAG_GETSOCK;
+	else if (protocol == IPPROTO_DCCP)
+		req.nlh.nlmsg_type = DCCPDIAG_GETSOCK;
+	else
+		return -1;
+
+	if (show_mem) {
+		req.r.idiag_ext |= (1<<(INET_DIAG_MEMINFO-1));
+		req.r.idiag_ext |= (1<<(INET_DIAG_SKMEMINFO-1));
+	}
+
+	if (show_tcpinfo) {
+		req.r.idiag_ext |= (1<<(INET_DIAG_INFO-1));
+		req.r.idiag_ext |= (1<<(INET_DIAG_VEGASINFO-1));
+		req.r.idiag_ext |= (1<<(INET_DIAG_CONG-1));
+	}
+
+	if (show_tos) {
+		req.r.idiag_ext |= (1<<(INET_DIAG_TOS-1));
+		req.r.idiag_ext |= (1<<(INET_DIAG_TCLASS-1));
+	}
+
+	iov[0] = (struct iovec){
+		.iov_base = &req,
+		.iov_len = sizeof(req)
+	};
+	if (f->f) {
+		bclen = ssfilter_bytecompile(f->f, &bc);
+		if (bclen) {
+			rta.rta_type = INET_DIAG_REQ_BYTECODE;
+			rta.rta_len = RTA_LENGTH(bclen);
+			iov[1] = (struct iovec){ &rta, sizeof(rta) };
+			iov[2] = (struct iovec){ bc, bclen };
+			req.nlh.nlmsg_len += RTA_LENGTH(bclen);
+			iovlen = 3;
+		}
+	}
+
+	msg = (struct msghdr) {
+		.msg_name = (void *)&nladdr,
+		.msg_namelen = sizeof(nladdr),
+		.msg_iov = iov,
+		.msg_iovlen = iovlen,
+	};
+
+	if (sendmsg(fd, &msg, 0) < 0) {
+		close(fd);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int sockdiag_send(int family, int fd, int protocol, struct filter *f)
+{
+	struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
+	DIAG_REQUEST(req, struct inet_diag_req_v2 r);
+	char    *bc = NULL;
+	int	bclen;
+	__u32	proto;
+	struct msghdr msg;
+	struct rtattr rta_bc;
+	struct rtattr rta_proto;
+	struct iovec iov[5];
+	int iovlen = 1;
+
+	if (family == PF_UNSPEC)
+		return tcpdiag_send(fd, protocol, f);
+
+	memset(&req.r, 0, sizeof(req.r));
+	req.r.sdiag_family = family;
+	req.r.sdiag_protocol = protocol;
+	req.r.idiag_states = f->states;
+	if (show_mem) {
+		req.r.idiag_ext |= (1<<(INET_DIAG_MEMINFO-1));
+		req.r.idiag_ext |= (1<<(INET_DIAG_SKMEMINFO-1));
+	}
+
+	if (show_tcpinfo) {
+		req.r.idiag_ext |= (1<<(INET_DIAG_INFO-1));
+		req.r.idiag_ext |= (1<<(INET_DIAG_VEGASINFO-1));
+		req.r.idiag_ext |= (1<<(INET_DIAG_CONG-1));
+	}
+
+	if (show_tos) {
+		req.r.idiag_ext |= (1<<(INET_DIAG_TOS-1));
+		req.r.idiag_ext |= (1<<(INET_DIAG_TCLASS-1));
+	}
+
+	iov[0] = (struct iovec){
+		.iov_base = &req,
+		.iov_len = sizeof(req)
+	};
+	if (f->f) {
+		bclen = ssfilter_bytecompile(f->f, &bc);
+		if (bclen) {
+			rta_bc.rta_type = INET_DIAG_REQ_BYTECODE;
+			rta_bc.rta_len = RTA_LENGTH(bclen);
+			iov[1] = (struct iovec){ &rta_bc, sizeof(rta_bc) };
+			iov[2] = (struct iovec){ bc, bclen };
+			req.nlh.nlmsg_len += RTA_LENGTH(bclen);
+			iovlen = 3;
+		}
+	}
+
+	/* put extended protocol attribute, if required */
+	if (protocol > 255) {
+		rta_proto.rta_type = INET_DIAG_REQ_PROTOCOL;
+		rta_proto.rta_len = RTA_LENGTH(sizeof(proto));
+		proto = protocol;
+		iov[iovlen] = (struct iovec){ &rta_proto, sizeof(rta_proto) };
+		iov[iovlen + 1] = (struct iovec){ &proto, sizeof(proto) };
+		req.nlh.nlmsg_len += RTA_LENGTH(sizeof(proto));
+		iovlen += 2;
+	}
+
+	msg = (struct msghdr) {
+		.msg_name = (void *)&nladdr,
+		.msg_namelen = sizeof(nladdr),
+		.msg_iov = iov,
+		.msg_iovlen = iovlen,
+	};
+
+	if (sendmsg(fd, &msg, 0) < 0) {
+		close(fd);
+		return -1;
+	}
+
+	return 0;
+}
+
+struct inet_diag_arg {
+	struct filter *f;
+	int protocol;
+	struct rtnl_handle *rth;
+};
+
+static int kill_inet_sock(struct nlmsghdr *h, void *arg, struct sockstat *s)
+{
+	struct inet_diag_msg *d = NLMSG_DATA(h);
+	struct inet_diag_arg *diag_arg = arg;
+	struct rtnl_handle *rth = diag_arg->rth;
+
+	DIAG_REQUEST(req, struct inet_diag_req_v2 r);
+
+	req.nlh.nlmsg_type = SOCK_DESTROY;
+	req.nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+	req.nlh.nlmsg_seq = ++rth->seq;
+	req.r.sdiag_family = d->idiag_family;
+	req.r.sdiag_protocol = diag_arg->protocol;
+	req.r.id = d->id;
+
+	if (diag_arg->protocol == IPPROTO_RAW) {
+		struct inet_diag_req_raw *raw = (void *)&req.r;
+
+		BUILD_BUG_ON(sizeof(req.r) != sizeof(*raw));
+		raw->sdiag_raw_protocol = s->raw_prot;
+	}
+
+	return rtnl_talk(rth, &req.nlh, NULL);
+}
+
+static int show_one_inet_sock(struct nlmsghdr *h, void *arg)
+{
+	int err;
+	struct inet_diag_arg *diag_arg = arg;
+	struct inet_diag_msg *r = NLMSG_DATA(h);
+	struct sockstat s = {};
+
+	if (!(diag_arg->f->families & FAMILY_MASK(r->idiag_family)))
+		return 0;
+
+	parse_diag_msg(h, &s);
+	s.type = diag_arg->protocol;
+
+	if (diag_arg->f->f && run_ssfilter(diag_arg->f->f, &s) == 0)
+		return 0;
+
+	if (diag_arg->f->kill && kill_inet_sock(h, arg, &s) != 0) {
+		if (errno == EOPNOTSUPP || errno == ENOENT) {
+			/* Socket can't be closed, or is already closed. */
+			return 0;
+		} else {
+			perror("SOCK_DESTROY answers");
+			return -1;
+		}
+	}
+
+	err = inet_show_sock(h, &s);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+
+static int inet_show_netlink(struct filter *f, FILE *dump_fp, int protocol)
+{
+	int err = 0;
+	struct rtnl_handle rth, rth2;
+	int family = PF_INET;
+	struct inet_diag_arg arg = { .f = f, .protocol = protocol };
+
+	if (rtnl_open_byproto(&rth, 0, NETLINK_SOCK_DIAG))
+		return -1;
+
+	if (f->kill) {
+		if (rtnl_open_byproto(&rth2, 0, NETLINK_SOCK_DIAG)) {
+			rtnl_close(&rth);
+			return -1;
+		}
+		arg.rth = &rth2;
+	}
+
+	rth.dump = MAGIC_SEQ;
+	rth.dump_fp = dump_fp;
+	if (preferred_family == PF_INET6)
+		family = PF_INET6;
+
+	/* extended protocol will use INET_DIAG_REQ_PROTOCOL,
+	 * not supported by older kernels. On such kernel
+	 * rtnl_dump will bail with rtnl_dump_error().
+	 * Suppress the error to avoid confusing the user
+	 */
+	if (protocol > 255)
+		rth.flags |= RTNL_HANDLE_F_SUPPRESS_NLERR;
+
+again:
+	if ((err = sockdiag_send(family, rth.fd, protocol, f)))
+		goto Exit;
+
+	if ((err = rtnl_dump_filter(&rth, show_one_inet_sock, &arg))) {
+		if (family != PF_UNSPEC) {
+			family = PF_UNSPEC;
+			goto again;
+		}
+		goto Exit;
+	}
+	if (family == PF_INET && preferred_family != PF_INET) {
+		family = PF_INET6;
+		goto again;
+	}
+
+Exit:
+	rtnl_close(&rth);
+	if (arg.rth)
+		rtnl_close(arg.rth);
+	return err;
+}
+
+static int tcp_show_netlink_file(struct filter *f)
+{
+	FILE	*fp;
+	char	buf[16384];
+	int	err = -1;
+
+	if ((fp = fopen(getenv("TCPDIAG_FILE"), "r")) == NULL) {
+		perror("fopen($TCPDIAG_FILE)");
+		return err;
+	}
+
+	while (1) {
+		int err2;
+		size_t status, nitems;
+		struct nlmsghdr *h = (struct nlmsghdr *)buf;
+		struct sockstat s = {};
+
+		status = fread(buf, 1, sizeof(*h), fp);
+		if (status != sizeof(*h)) {
+			if (ferror(fp))
+				perror("Reading header from $TCPDIAG_FILE");
+			if (feof(fp))
+				fprintf(stderr, "Unexpected EOF reading $TCPDIAG_FILE");
+			break;
+		}
+
+		nitems = NLMSG_ALIGN(h->nlmsg_len - sizeof(*h));
+		status = fread(h+1, 1, nitems, fp);
+
+		if (status != nitems) {
+			if (ferror(fp))
+				perror("Reading $TCPDIAG_FILE");
+			if (feof(fp))
+				fprintf(stderr, "Unexpected EOF reading $TCPDIAG_FILE");
+			break;
+		}
+
+		/* The only legal exit point */
+		if (h->nlmsg_type == NLMSG_DONE) {
+			err = 0;
+			break;
+		}
+
+		if (h->nlmsg_type == NLMSG_ERROR) {
+			struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h);
+
+			if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
+				fprintf(stderr, "ERROR truncated\n");
+			} else {
+				errno = -err->error;
+				perror("TCPDIAG answered");
+			}
+			break;
+		}
+
+		parse_diag_msg(h, &s);
+		s.type = IPPROTO_TCP;
+
+		if (f && f->f && run_ssfilter(f->f, &s) == 0)
+			continue;
+
+		err2 = inet_show_sock(h, &s);
+		if (err2 < 0) {
+			err = err2;
+			break;
+		}
+	}
+
+	fclose(fp);
+	return err;
+}
+
+static int tcp_show(struct filter *f)
+{
+	FILE *fp = NULL;
+	char *buf = NULL;
+	int bufsize = 1024*1024;
+
+	if (!filter_af_get(f, AF_INET) && !filter_af_get(f, AF_INET6))
+		return 0;
+
+	dg_proto = TCP_PROTO;
+
+	if (getenv("TCPDIAG_FILE"))
+		return tcp_show_netlink_file(f);
+
+	if (!getenv("PROC_NET_TCP") && !getenv("PROC_ROOT")
+	    && inet_show_netlink(f, NULL, IPPROTO_TCP) == 0)
+		return 0;
+
+	/* Sigh... We have to parse /proc/net/tcp... */
+	while (bufsize >= 64*1024) {
+		if ((buf = malloc(bufsize)) != NULL)
+			break;
+		bufsize /= 2;
+	}
+	if (buf == NULL) {
+		errno = ENOMEM;
+		return -1;
+	}
+
+	if (f->families & FAMILY_MASK(AF_INET)) {
+		if ((fp = net_tcp_open()) == NULL)
+			goto outerr;
+
+		setbuffer(fp, buf, bufsize);
+		if (generic_record_read(fp, tcp_show_line, f, AF_INET))
+			goto outerr;
+		fclose(fp);
+	}
+
+	if ((f->families & FAMILY_MASK(AF_INET6)) &&
+	    (fp = net_tcp6_open()) != NULL) {
+		setbuffer(fp, buf, bufsize);
+		if (generic_record_read(fp, tcp_show_line, f, AF_INET6))
+			goto outerr;
+		fclose(fp);
+	}
+
+	free(buf);
+	return 0;
+
+outerr:
+	do {
+		int saved_errno = errno;
+
+		free(buf);
+		if (fp)
+			fclose(fp);
+		errno = saved_errno;
+		return -1;
+	} while (0);
+}
+
+static int mptcp_show(struct filter *f)
+{
+	if (!filter_af_get(f, AF_INET) && !filter_af_get(f, AF_INET6))
+		return 0;
+
+	if (!getenv("PROC_NET_MPTCP") && !getenv("PROC_ROOT")
+	    && inet_show_netlink(f, NULL, IPPROTO_MPTCP) == 0)
+		return 0;
+
+	return 0;
+}
+
+static int dccp_show(struct filter *f)
+{
+	if (!filter_af_get(f, AF_INET) && !filter_af_get(f, AF_INET6))
+		return 0;
+
+	if (!getenv("PROC_NET_DCCP") && !getenv("PROC_ROOT")
+	    && inet_show_netlink(f, NULL, IPPROTO_DCCP) == 0)
+		return 0;
+
+	return 0;
+}
+
+static int sctp_show(struct filter *f)
+{
+	if (!filter_af_get(f, AF_INET) && !filter_af_get(f, AF_INET6))
+		return 0;
+
+	if (!getenv("PROC_NET_SCTP") && !getenv("PROC_ROOT")
+	    && inet_show_netlink(f, NULL, IPPROTO_SCTP) == 0)
+		return 0;
+
+	return 0;
+}
+
+static int dgram_show_line(char *line, const struct filter *f, int family)
+{
+	struct sockstat s = {};
+	char *loc, *rem, *data;
+	char opt[256];
+	int n;
+
+	if (proc_inet_split_line(line, &loc, &rem, &data))
+		return -1;
+
+	int state = (data[1] >= 'A') ? (data[1] - 'A' + 10) : (data[1] - '0');
+
+	if (!(f->states & (1 << state)))
+		return 0;
+
+	proc_parse_inet_addr(loc, rem, family, &s);
+
+	if (f->f && run_ssfilter(f->f, &s) == 0)
+		return 0;
+
+	opt[0] = 0;
+	n = sscanf(data, "%x %x:%x %*x:%*x %*x %d %*d %u %d %llx %[^\n]\n",
+	       &s.state, &s.wq, &s.rq,
+	       &s.uid, &s.ino,
+	       &s.refcnt, &s.sk, opt);
+
+	if (n < 9)
+		opt[0] = 0;
+
+	s.type = dg_proto == UDP_PROTO ? IPPROTO_UDP : 0;
+	inet_stats_print(&s, false);
+
+	if (show_details && opt[0])
+		out(" opt:\"%s\"", opt);
+
+	return 0;
+}
+
+static int udp_show(struct filter *f)
+{
+	FILE *fp = NULL;
+
+	if (!filter_af_get(f, AF_INET) && !filter_af_get(f, AF_INET6))
+		return 0;
+
+	dg_proto = UDP_PROTO;
+
+	if (!getenv("PROC_NET_UDP") && !getenv("PROC_ROOT")
+	    && inet_show_netlink(f, NULL, IPPROTO_UDP) == 0)
+		return 0;
+
+	if (f->families&FAMILY_MASK(AF_INET)) {
+		if ((fp = net_udp_open()) == NULL)
+			goto outerr;
+		if (generic_record_read(fp, dgram_show_line, f, AF_INET))
+			goto outerr;
+		fclose(fp);
+	}
+
+	if ((f->families&FAMILY_MASK(AF_INET6)) &&
+	    (fp = net_udp6_open()) != NULL) {
+		if (generic_record_read(fp, dgram_show_line, f, AF_INET6))
+			goto outerr;
+		fclose(fp);
+	}
+	return 0;
+
+outerr:
+	do {
+		int saved_errno = errno;
+
+		if (fp)
+			fclose(fp);
+		errno = saved_errno;
+		return -1;
+	} while (0);
+}
+
+static int raw_show(struct filter *f)
+{
+	FILE *fp = NULL;
+
+	if (!filter_af_get(f, AF_INET) && !filter_af_get(f, AF_INET6))
+		return 0;
+
+	dg_proto = RAW_PROTO;
+
+	if (!getenv("PROC_NET_RAW") && !getenv("PROC_ROOT") &&
+	    inet_show_netlink(f, NULL, IPPROTO_RAW) == 0)
+		return 0;
+
+	if (f->families&FAMILY_MASK(AF_INET)) {
+		if ((fp = net_raw_open()) == NULL)
+			goto outerr;
+		if (generic_record_read(fp, dgram_show_line, f, AF_INET))
+			goto outerr;
+		fclose(fp);
+	}
+
+	if ((f->families&FAMILY_MASK(AF_INET6)) &&
+	    (fp = net_raw6_open()) != NULL) {
+		if (generic_record_read(fp, dgram_show_line, f, AF_INET6))
+			goto outerr;
+		fclose(fp);
+	}
+	return 0;
+
+outerr:
+	do {
+		int saved_errno = errno;
+
+		if (fp)
+			fclose(fp);
+		errno = saved_errno;
+		return -1;
+	} while (0);
+}
+
+#define MAX_UNIX_REMEMBER (1024*1024/sizeof(struct sockstat))
+
+static void unix_list_drop_first(struct sockstat **list)
+{
+	struct sockstat *s = *list;
+
+	(*list) = (*list)->next;
+	free(s->name);
+	free(s);
+}
+
+static bool unix_type_skip(struct sockstat *s, struct filter *f)
+{
+	if (s->type == SOCK_STREAM && !(f->dbs&(1<<UNIX_ST_DB)))
+		return true;
+	if (s->type == SOCK_DGRAM && !(f->dbs&(1<<UNIX_DG_DB)))
+		return true;
+	if (s->type == SOCK_SEQPACKET && !(f->dbs&(1<<UNIX_SQ_DB)))
+		return true;
+	return false;
+}
+
+static void unix_stats_print(struct sockstat *s, struct filter *f)
+{
+	char port_name[30] = {};
+
+	sock_state_print(s);
+
+	sock_addr_print(s->name ?: "*", " ",
+			uint_to_str(s->lport, port_name), NULL);
+	sock_addr_print(s->peer_name ?: "*", " ",
+			uint_to_str(s->rport, port_name), NULL);
+
+	proc_ctx_print(s);
+}
+
+static int unix_show_sock(struct nlmsghdr *nlh, void *arg)
+{
+	struct filter *f = (struct filter *)arg;
+	struct unix_diag_msg *r = NLMSG_DATA(nlh);
+	struct rtattr *tb[UNIX_DIAG_MAX+1];
+	char name[128];
+	struct sockstat stat = { .name = "*", .peer_name = "*" };
+
+	parse_rtattr(tb, UNIX_DIAG_MAX, (struct rtattr *)(r+1),
+		     nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
+
+	stat.type  = r->udiag_type;
+	stat.state = r->udiag_state;
+	stat.ino   = stat.lport = r->udiag_ino;
+	stat.local.family = stat.remote.family = AF_UNIX;
+
+	if (unix_type_skip(&stat, f))
+		return 0;
+
+	if (tb[UNIX_DIAG_RQLEN]) {
+		struct unix_diag_rqlen *rql = RTA_DATA(tb[UNIX_DIAG_RQLEN]);
+
+		stat.rq = rql->udiag_rqueue;
+		stat.wq = rql->udiag_wqueue;
+	}
+	if (tb[UNIX_DIAG_NAME]) {
+		int len = RTA_PAYLOAD(tb[UNIX_DIAG_NAME]);
+
+		memcpy(name, RTA_DATA(tb[UNIX_DIAG_NAME]), len);
+		name[len] = '\0';
+		if (name[0] == '\0') {
+			int i;
+			for (i = 0; i < len; i++)
+				if (name[i] == '\0')
+					name[i] = '@';
+		}
+		stat.name = &name[0];
+		memcpy(stat.local.data, &stat.name, sizeof(stat.name));
+	}
+	if (tb[UNIX_DIAG_PEER])
+		stat.rport = rta_getattr_u32(tb[UNIX_DIAG_PEER]);
+
+	if (f->f && run_ssfilter(f->f, &stat) == 0)
+		return 0;
+
+	unix_stats_print(&stat, f);
+
+	if (show_mem)
+		print_skmeminfo(tb, UNIX_DIAG_MEMINFO);
+	if (show_details) {
+		if (tb[UNIX_DIAG_SHUTDOWN]) {
+			unsigned char mask;
+
+			mask = rta_getattr_u8(tb[UNIX_DIAG_SHUTDOWN]);
+			out(" %c-%c",
+			    mask & 1 ? '-' : '<', mask & 2 ? '-' : '>');
+		}
+		if (tb[UNIX_DIAG_VFS]) {
+			struct unix_diag_vfs *uv = RTA_DATA(tb[UNIX_DIAG_VFS]);
+
+			out(" ino:%u dev:%u/%u", uv->udiag_vfs_ino, major(uv->udiag_vfs_dev),
+						 minor(uv->udiag_vfs_dev));
+		}
+		if (tb[UNIX_DIAG_ICONS]) {
+			int len = RTA_PAYLOAD(tb[UNIX_DIAG_ICONS]);
+			__u32 *peers = RTA_DATA(tb[UNIX_DIAG_ICONS]);
+			int i;
+
+			out(" peers:");
+			for (i = 0; i < len / sizeof(__u32); i++)
+				out(" %u", peers[i]);
+		}
+	}
+
+	return 0;
+}
+
+static int handle_netlink_request(struct filter *f, struct nlmsghdr *req,
+		size_t size, rtnl_filter_t show_one_sock)
+{
+	int ret = -1;
+	struct rtnl_handle rth;
+
+	if (rtnl_open_byproto(&rth, 0, NETLINK_SOCK_DIAG))
+		return -1;
+
+	rth.dump = MAGIC_SEQ;
+
+	if (rtnl_send(&rth, req, size) < 0)
+		goto Exit;
+
+	if (rtnl_dump_filter(&rth, show_one_sock, f))
+		goto Exit;
+
+	ret = 0;
+Exit:
+	rtnl_close(&rth);
+	return ret;
+}
+
+static int unix_show_netlink(struct filter *f)
+{
+	DIAG_REQUEST(req, struct unix_diag_req r);
+
+	req.r.sdiag_family = AF_UNIX;
+	req.r.udiag_states = f->states;
+	req.r.udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_PEER | UDIAG_SHOW_RQLEN;
+	if (show_mem)
+		req.r.udiag_show |= UDIAG_SHOW_MEMINFO;
+	if (show_details)
+		req.r.udiag_show |= UDIAG_SHOW_VFS | UDIAG_SHOW_ICONS;
+
+	return handle_netlink_request(f, &req.nlh, sizeof(req), unix_show_sock);
+}
+
+static int unix_show(struct filter *f)
+{
+	FILE *fp;
+	char buf[256];
+	char name[128];
+	int  newformat = 0;
+	int  cnt;
+	struct sockstat *list = NULL;
+	const int unix_state_map[] = { SS_CLOSE, SS_SYN_SENT,
+				       SS_ESTABLISHED, SS_CLOSING };
+
+	if (!filter_af_get(f, AF_UNIX))
+		return 0;
+
+	if (!getenv("PROC_NET_UNIX") && !getenv("PROC_ROOT")
+	    && unix_show_netlink(f) == 0)
+		return 0;
+
+	if ((fp = net_unix_open()) == NULL)
+		return -1;
+	if (!fgets(buf, sizeof(buf), fp)) {
+		fclose(fp);
+		return -1;
+	}
+
+	if (memcmp(buf, "Peer", 4) == 0)
+		newformat = 1;
+	cnt = 0;
+
+	while (fgets(buf, sizeof(buf), fp)) {
+		struct sockstat *u, **insp;
+		int flags;
+
+		if (!(u = calloc(1, sizeof(*u))))
+			break;
+
+		if (sscanf(buf, "%x: %x %x %x %x %x %d %s",
+			   &u->rport, &u->rq, &u->wq, &flags, &u->type,
+			   &u->state, &u->ino, name) < 8)
+			name[0] = 0;
+
+		u->lport = u->ino;
+		u->local.family = u->remote.family = AF_UNIX;
+
+		if (flags & (1 << 16)) {
+			u->state = SS_LISTEN;
+		} else if (u->state > 0 &&
+			   u->state <= ARRAY_SIZE(unix_state_map)) {
+			u->state = unix_state_map[u->state-1];
+			if (u->type == SOCK_DGRAM && u->state == SS_CLOSE && u->rport)
+				u->state = SS_ESTABLISHED;
+		}
+		if (unix_type_skip(u, f) ||
+		    !(f->states & (1 << u->state))) {
+			free(u);
+			continue;
+		}
+
+		if (!newformat) {
+			u->rport = 0;
+			u->rq = 0;
+			u->wq = 0;
+		}
+
+		if (name[0]) {
+			u->name = strdup(name);
+			if (!u->name) {
+				free(u);
+				break;
+			}
+		}
+
+		if (u->rport) {
+			struct sockstat *p;
+
+			for (p = list; p; p = p->next) {
+				if (u->rport == p->lport)
+					break;
+			}
+			if (!p)
+				u->peer_name = "?";
+			else
+				u->peer_name = p->name ? : "*";
+		}
+
+		if (f->f) {
+			struct sockstat st = {
+				.local.family = AF_UNIX,
+				.remote.family = AF_UNIX,
+			};
+
+			memcpy(st.local.data, &u->name, sizeof(u->name));
+			/* when parsing the old format rport is set to 0 and
+			 * therefore peer_name remains NULL
+			 */
+			if (u->peer_name && strcmp(u->peer_name, "*"))
+				memcpy(st.remote.data, &u->peer_name,
+				       sizeof(u->peer_name));
+			if (run_ssfilter(f->f, &st) == 0) {
+				free(u->name);
+				free(u);
+				continue;
+			}
+		}
+
+		insp = &list;
+		while (*insp) {
+			if (u->type < (*insp)->type ||
+			    (u->type == (*insp)->type &&
+			     u->ino < (*insp)->ino))
+				break;
+			insp = &(*insp)->next;
+		}
+		u->next = *insp;
+		*insp = u;
+
+		if (++cnt > MAX_UNIX_REMEMBER) {
+			while (list) {
+				unix_stats_print(list, f);
+				unix_list_drop_first(&list);
+			}
+			cnt = 0;
+		}
+	}
+	fclose(fp);
+	while (list) {
+		unix_stats_print(list, f);
+		unix_list_drop_first(&list);
+	}
+
+	return 0;
+}
+
+static int packet_stats_print(struct sockstat *s, const struct filter *f)
+{
+	const char *addr, *port;
+	char ll_name[16];
+
+	s->local.family = s->remote.family = AF_PACKET;
+
+	if (f->f) {
+		s->local.data[0] = s->prot;
+		if (run_ssfilter(f->f, s) == 0)
+			return 1;
+	}
+
+	sock_state_print(s);
+
+	if (s->prot == 3)
+		addr = "*";
+	else
+		addr = ll_proto_n2a(htons(s->prot), ll_name, sizeof(ll_name));
+
+	if (s->iface == 0)
+		port = "*";
+	else
+		port = xll_index_to_name(s->iface);
+
+	sock_addr_print(addr, ":", port, NULL);
+	sock_addr_print("", "*", "", NULL);
+
+	proc_ctx_print(s);
+
+	if (show_details)
+		sock_details_print(s);
+
+	return 0;
+}
+
+static void packet_show_ring(struct packet_diag_ring *ring)
+{
+	out("blk_size:%d", ring->pdr_block_size);
+	out(",blk_nr:%d", ring->pdr_block_nr);
+	out(",frm_size:%d", ring->pdr_frame_size);
+	out(",frm_nr:%d", ring->pdr_frame_nr);
+	out(",tmo:%d", ring->pdr_retire_tmo);
+	out(",features:0x%x", ring->pdr_features);
+}
+
+static int packet_show_sock(struct nlmsghdr *nlh, void *arg)
+{
+	const struct filter *f = arg;
+	struct packet_diag_msg *r = NLMSG_DATA(nlh);
+	struct packet_diag_info *pinfo = NULL;
+	struct packet_diag_ring *ring_rx = NULL, *ring_tx = NULL;
+	struct rtattr *tb[PACKET_DIAG_MAX+1];
+	struct sockstat stat = {};
+	uint32_t fanout = 0;
+	bool has_fanout = false;
+
+	parse_rtattr(tb, PACKET_DIAG_MAX, (struct rtattr *)(r+1),
+		     nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
+
+	/* use /proc/net/packet if all info are not available */
+	if (!tb[PACKET_DIAG_MEMINFO])
+		return -1;
+
+	stat.type   = r->pdiag_type;
+	stat.prot   = r->pdiag_num;
+	stat.ino    = r->pdiag_ino;
+	stat.state  = SS_CLOSE;
+	stat.sk	    = cookie_sk_get(&r->pdiag_cookie[0]);
+
+	if (tb[PACKET_DIAG_MEMINFO]) {
+		__u32 *skmeminfo = RTA_DATA(tb[PACKET_DIAG_MEMINFO]);
+
+		stat.rq = skmeminfo[SK_MEMINFO_RMEM_ALLOC];
+	}
+
+	if (tb[PACKET_DIAG_INFO]) {
+		pinfo = RTA_DATA(tb[PACKET_DIAG_INFO]);
+		stat.lport = stat.iface = pinfo->pdi_index;
+	}
+
+	if (tb[PACKET_DIAG_UID])
+		stat.uid = rta_getattr_u32(tb[PACKET_DIAG_UID]);
+
+	if (tb[PACKET_DIAG_RX_RING])
+		ring_rx = RTA_DATA(tb[PACKET_DIAG_RX_RING]);
+
+	if (tb[PACKET_DIAG_TX_RING])
+		ring_tx = RTA_DATA(tb[PACKET_DIAG_TX_RING]);
+
+	if (tb[PACKET_DIAG_FANOUT]) {
+		has_fanout = true;
+		fanout = rta_getattr_u32(tb[PACKET_DIAG_FANOUT]);
+	}
+
+	if (packet_stats_print(&stat, f))
+		return 0;
+
+	if (show_details) {
+		if (pinfo) {
+			if (oneline)
+				out(" ver:%d", pinfo->pdi_version);
+			else
+				out("\n\tver:%d", pinfo->pdi_version);
+			out(" cpy_thresh:%d", pinfo->pdi_copy_thresh);
+			out(" flags( ");
+			if (pinfo->pdi_flags & PDI_RUNNING)
+				out("running");
+			if (pinfo->pdi_flags & PDI_AUXDATA)
+				out(" auxdata");
+			if (pinfo->pdi_flags & PDI_ORIGDEV)
+				out(" origdev");
+			if (pinfo->pdi_flags & PDI_VNETHDR)
+				out(" vnethdr");
+			if (pinfo->pdi_flags & PDI_LOSS)
+				out(" loss");
+			if (!pinfo->pdi_flags)
+				out("0");
+			out(" )");
+		}
+		if (ring_rx) {
+			if (oneline)
+				out(" ring_rx(");
+			else
+				out("\n\tring_rx(");
+			packet_show_ring(ring_rx);
+			out(")");
+		}
+		if (ring_tx) {
+			if (oneline)
+				out(" ring_tx(");
+			else
+				out("\n\tring_tx(");
+			packet_show_ring(ring_tx);
+			out(")");
+		}
+		if (has_fanout) {
+			uint16_t type = (fanout >> 16) & 0xffff;
+
+			if (oneline)
+				out(" fanout(");
+			else
+				out("\n\tfanout(");
+			out("id:%d,", fanout & 0xffff);
+			out("type:");
+
+			if (type == 0)
+				out("hash");
+			else if (type == 1)
+				out("lb");
+			else if (type == 2)
+				out("cpu");
+			else if (type == 3)
+				out("roll");
+			else if (type == 4)
+				out("random");
+			else if (type == 5)
+				out("qm");
+			else
+				out("0x%x", type);
+
+			out(")");
+		}
+	}
+
+	if (show_bpf && tb[PACKET_DIAG_FILTER]) {
+		struct sock_filter *fil =
+		       RTA_DATA(tb[PACKET_DIAG_FILTER]);
+		int num = RTA_PAYLOAD(tb[PACKET_DIAG_FILTER]) /
+			  sizeof(struct sock_filter);
+
+		if (oneline)
+			out(" bpf filter (%d): ", num);
+		else
+			out("\n\tbpf filter (%d): ", num);
+		while (num) {
+			out(" 0x%02x %u %u %u,",
+			    fil->code, fil->jt, fil->jf, fil->k);
+			num--;
+			fil++;
+		}
+	}
+
+	if (show_mem)
+		print_skmeminfo(tb, PACKET_DIAG_MEMINFO);
+	return 0;
+}
+
+static int packet_show_netlink(struct filter *f)
+{
+	DIAG_REQUEST(req, struct packet_diag_req r);
+
+	req.r.sdiag_family = AF_PACKET;
+	req.r.pdiag_show = PACKET_SHOW_INFO | PACKET_SHOW_MEMINFO |
+		PACKET_SHOW_FILTER | PACKET_SHOW_RING_CFG | PACKET_SHOW_FANOUT;
+
+	return handle_netlink_request(f, &req.nlh, sizeof(req), packet_show_sock);
+}
+
+static int packet_show_line(char *buf, const struct filter *f, int fam)
+{
+	unsigned long long sk;
+	struct sockstat stat = {};
+	int type, prot, iface, state, rq, uid, ino;
+
+	sscanf(buf, "%llx %*d %d %x %d %d %u %u %u",
+			&sk,
+			&type, &prot, &iface, &state,
+			&rq, &uid, &ino);
+
+	if (type == SOCK_RAW && !(f->dbs & (1<<PACKET_R_DB)))
+		return 0;
+	if (type == SOCK_DGRAM && !(f->dbs & (1<<PACKET_DG_DB)))
+		return 0;
+
+	stat.type  = type;
+	stat.prot  = prot;
+	stat.lport = stat.iface = iface;
+	stat.state = state;
+	stat.rq    = rq;
+	stat.uid   = uid;
+	stat.ino   = ino;
+	stat.state = SS_CLOSE;
+
+	if (packet_stats_print(&stat, f))
+		return 0;
+
+	return 0;
+}
+
+static int packet_show(struct filter *f)
+{
+	FILE *fp;
+	int rc = 0;
+
+	if (!filter_af_get(f, AF_PACKET) || !(f->states & (1 << SS_CLOSE)))
+		return 0;
+
+	if (!getenv("PROC_NET_PACKET") && !getenv("PROC_ROOT") &&
+			packet_show_netlink(f) == 0)
+		return 0;
+
+	if ((fp = net_packet_open()) == NULL)
+		return -1;
+	if (generic_record_read(fp, packet_show_line, f, AF_PACKET))
+		rc = -1;
+
+	fclose(fp);
+	return rc;
+}
+
+static int xdp_stats_print(struct sockstat *s, const struct filter *f)
+{
+	const char *addr, *port;
+	char q_str[16];
+
+	s->local.family = s->remote.family = AF_XDP;
+
+	if (f->f) {
+		if (run_ssfilter(f->f, s) == 0)
+			return 1;
+	}
+
+	sock_state_print(s);
+
+	if (s->iface) {
+		addr = xll_index_to_name(s->iface);
+		snprintf(q_str, sizeof(q_str), "q%d", s->lport);
+		port = q_str;
+		sock_addr_print(addr, ":", port, NULL);
+	} else {
+		sock_addr_print("", "*", "", NULL);
+	}
+
+	sock_addr_print("", "*", "", NULL);
+
+	proc_ctx_print(s);
+
+	if (show_details)
+		sock_details_print(s);
+
+	return 0;
+}
+
+static void xdp_show_ring(const char *name, struct xdp_diag_ring *ring)
+{
+	if (oneline)
+		out(" %s(", name);
+	else
+		out("\n\t%s(", name);
+	out("entries:%u", ring->entries);
+	out(")");
+}
+
+static void xdp_show_umem(struct xdp_diag_umem *umem, struct xdp_diag_ring *fr,
+			  struct xdp_diag_ring *cr)
+{
+	if (oneline)
+		out(" tumem(");
+	else
+		out("\n\tumem(");
+	out("id:%u", umem->id);
+	out(",size:%llu", umem->size);
+	out(",num_pages:%u", umem->num_pages);
+	out(",chunk_size:%u", umem->chunk_size);
+	out(",headroom:%u", umem->headroom);
+	out(",ifindex:%u", umem->ifindex);
+	out(",qid:%u", umem->queue_id);
+	out(",zc:%u", umem->flags & XDP_DU_F_ZEROCOPY);
+	out(",refs:%u", umem->refs);
+	out(")");
+
+	if (fr)
+		xdp_show_ring("fr", fr);
+	if (cr)
+		xdp_show_ring("cr", cr);
+}
+
+static void xdp_show_stats(struct xdp_diag_stats *stats)
+{
+	if (oneline)
+		out(" stats(");
+	else
+		out("\n\tstats(");
+	out("rx dropped:%llu", stats->n_rx_dropped);
+	out(",rx invalid:%llu", stats->n_rx_invalid);
+	out(",rx queue full:%llu", stats->n_rx_full);
+	out(",rx fill ring empty:%llu", stats->n_fill_ring_empty);
+	out(",tx invalid:%llu", stats->n_tx_invalid);
+	out(",tx ring empty:%llu", stats->n_tx_ring_empty);
+	out(")");
+}
+
+static int xdp_show_sock(struct nlmsghdr *nlh, void *arg)
+{
+	struct xdp_diag_ring *rx = NULL, *tx = NULL, *fr = NULL, *cr = NULL;
+	struct xdp_diag_msg *msg = NLMSG_DATA(nlh);
+	struct rtattr *tb[XDP_DIAG_MAX + 1];
+	struct xdp_diag_info *info = NULL;
+	struct xdp_diag_umem *umem = NULL;
+	struct xdp_diag_stats *stats = NULL;
+	const struct filter *f = arg;
+	struct sockstat stat = {};
+
+	parse_rtattr(tb, XDP_DIAG_MAX, (struct rtattr *)(msg + 1),
+		     nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*msg)));
+
+	stat.type = msg->xdiag_type;
+	stat.ino = msg->xdiag_ino;
+	stat.state = SS_CLOSE;
+	stat.sk = cookie_sk_get(&msg->xdiag_cookie[0]);
+
+	if (tb[XDP_DIAG_INFO]) {
+		info = RTA_DATA(tb[XDP_DIAG_INFO]);
+		stat.iface = info->ifindex;
+		stat.lport = info->queue_id;
+	}
+
+	if (tb[XDP_DIAG_UID])
+		stat.uid = rta_getattr_u32(tb[XDP_DIAG_UID]);
+	if (tb[XDP_DIAG_RX_RING])
+		rx = RTA_DATA(tb[XDP_DIAG_RX_RING]);
+	if (tb[XDP_DIAG_TX_RING])
+		tx = RTA_DATA(tb[XDP_DIAG_TX_RING]);
+	if (tb[XDP_DIAG_UMEM])
+		umem = RTA_DATA(tb[XDP_DIAG_UMEM]);
+	if (tb[XDP_DIAG_UMEM_FILL_RING])
+		fr = RTA_DATA(tb[XDP_DIAG_UMEM_FILL_RING]);
+	if (tb[XDP_DIAG_UMEM_COMPLETION_RING])
+		cr = RTA_DATA(tb[XDP_DIAG_UMEM_COMPLETION_RING]);
+	if (tb[XDP_DIAG_MEMINFO]) {
+		__u32 *skmeminfo = RTA_DATA(tb[XDP_DIAG_MEMINFO]);
+
+		stat.rq = skmeminfo[SK_MEMINFO_RMEM_ALLOC];
+	}
+	if (tb[XDP_DIAG_STATS])
+		stats = RTA_DATA(tb[XDP_DIAG_STATS]);
+
+	if (xdp_stats_print(&stat, f))
+		return 0;
+
+	if (show_details) {
+		if (rx)
+			xdp_show_ring("rx", rx);
+		if (tx)
+			xdp_show_ring("tx", tx);
+		if (umem)
+			xdp_show_umem(umem, fr, cr);
+		if (stats)
+			xdp_show_stats(stats);
+	}
+
+	if (show_mem)
+		print_skmeminfo(tb, XDP_DIAG_MEMINFO); // really?
+
+
+	return 0;
+}
+
+static int xdp_show(struct filter *f)
+{
+	DIAG_REQUEST(req, struct xdp_diag_req r);
+
+	if (!filter_af_get(f, AF_XDP) || !(f->states & (1 << SS_CLOSE)))
+		return 0;
+
+	req.r.sdiag_family = AF_XDP;
+	req.r.xdiag_show = XDP_SHOW_INFO | XDP_SHOW_RING_CFG | XDP_SHOW_UMEM |
+			   XDP_SHOW_MEMINFO | XDP_SHOW_STATS;
+
+	return handle_netlink_request(f, &req.nlh, sizeof(req), xdp_show_sock);
+}
+
+static int netlink_show_one(struct filter *f,
+				int prot, int pid, unsigned int groups,
+				int state, int dst_pid, unsigned int dst_group,
+				int rq, int wq,
+				unsigned long long sk, unsigned long long cb)
+{
+	struct sockstat st = {
+		.state		= SS_CLOSE,
+		.rq		= rq,
+		.wq		= wq,
+		.local.family	= AF_NETLINK,
+		.remote.family	= AF_NETLINK,
+	};
+
+	SPRINT_BUF(prot_buf) = {};
+	const char *prot_name;
+	char procname[64] = {};
+
+	if (f->f) {
+		st.rport = -1;
+		st.lport = pid;
+		st.local.data[0] = prot;
+		if (run_ssfilter(f->f, &st) == 0)
+			return 1;
+	}
+
+	sock_state_print(&st);
+
+	prot_name = nl_proto_n2a(prot, prot_buf, sizeof(prot_buf));
+
+	if (pid == -1) {
+		procname[0] = '*';
+	} else if (!numeric) {
+		int done = 0;
+
+		if (!pid) {
+			done = 1;
+			strncpy(procname, "kernel", 7);
+		} else if (pid > 0) {
+			FILE *fp;
+
+			snprintf(procname, sizeof(procname), "%s/%d/stat",
+				getenv("PROC_ROOT") ? : "/proc", pid);
+			if ((fp = fopen(procname, "r")) != NULL) {
+				if (fscanf(fp, "%*d (%[^)])", procname) == 1) {
+					snprintf(procname+strlen(procname),
+						sizeof(procname)-strlen(procname),
+						"/%d", pid);
+					done = 1;
+				}
+				fclose(fp);
+			}
+		}
+		if (!done)
+			int_to_str(pid, procname);
+	} else {
+		int_to_str(pid, procname);
+	}
+
+	sock_addr_print(prot_name, ":", procname, NULL);
+
+	if (state == NETLINK_CONNECTED) {
+		char dst_group_buf[30];
+		char dst_pid_buf[30];
+
+		sock_addr_print(int_to_str(dst_group, dst_group_buf), ":",
+				int_to_str(dst_pid, dst_pid_buf), NULL);
+	} else {
+		sock_addr_print("", "*", "", NULL);
+	}
+
+	char *pid_context = NULL;
+
+	if (show_proc_ctx) {
+		/* The pid value will either be:
+		 *   0 if destination kernel - show kernel initial context.
+		 *   A valid process pid - use getpidcon.
+		 *   A unique value allocated by the kernel or netlink user
+		 *   to the process - show context as "not available".
+		 */
+		if (!pid)
+			security_get_initial_context("kernel", &pid_context);
+		else if (pid > 0)
+			getpidcon(pid, &pid_context);
+
+		out(" proc_ctx=%s", pid_context ? : "unavailable");
+		freecon(pid_context);
+	}
+
+	if (show_details) {
+		out(" sk=%llx cb=%llx groups=0x%08x", sk, cb, groups);
+	}
+
+	return 0;
+}
+
+static int netlink_show_sock(struct nlmsghdr *nlh, void *arg)
+{
+	struct filter *f = (struct filter *)arg;
+	struct netlink_diag_msg *r = NLMSG_DATA(nlh);
+	struct rtattr *tb[NETLINK_DIAG_MAX+1];
+	int rq = 0, wq = 0;
+	unsigned long groups = 0;
+
+	parse_rtattr(tb, NETLINK_DIAG_MAX, (struct rtattr *)(r+1),
+		     nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
+
+	if (tb[NETLINK_DIAG_GROUPS] && RTA_PAYLOAD(tb[NETLINK_DIAG_GROUPS]))
+		groups = *(unsigned long *) RTA_DATA(tb[NETLINK_DIAG_GROUPS]);
+
+	if (tb[NETLINK_DIAG_MEMINFO]) {
+		const __u32 *skmeminfo;
+
+		skmeminfo = RTA_DATA(tb[NETLINK_DIAG_MEMINFO]);
+
+		rq = skmeminfo[SK_MEMINFO_RMEM_ALLOC];
+		wq = skmeminfo[SK_MEMINFO_WMEM_ALLOC];
+	}
+
+	if (netlink_show_one(f, r->ndiag_protocol, r->ndiag_portid, groups,
+			 r->ndiag_state, r->ndiag_dst_portid, r->ndiag_dst_group,
+			 rq, wq, 0, 0)) {
+		return 0;
+	}
+
+	if (show_mem) {
+		out("\t");
+		print_skmeminfo(tb, NETLINK_DIAG_MEMINFO);
+	}
+
+	return 0;
+}
+
+static int netlink_show_netlink(struct filter *f)
+{
+	DIAG_REQUEST(req, struct netlink_diag_req r);
+
+	req.r.sdiag_family = AF_NETLINK;
+	req.r.sdiag_protocol = NDIAG_PROTO_ALL;
+	req.r.ndiag_show = NDIAG_SHOW_GROUPS | NDIAG_SHOW_MEMINFO;
+
+	return handle_netlink_request(f, &req.nlh, sizeof(req), netlink_show_sock);
+}
+
+static int netlink_show(struct filter *f)
+{
+	FILE *fp;
+	char buf[256];
+	int prot, pid;
+	unsigned int groups;
+	int rq, wq, rc;
+	unsigned long long sk, cb;
+
+	if (!filter_af_get(f, AF_NETLINK) || !(f->states & (1 << SS_CLOSE)))
+		return 0;
+
+	if (!getenv("PROC_NET_NETLINK") && !getenv("PROC_ROOT") &&
+		netlink_show_netlink(f) == 0)
+		return 0;
+
+	if ((fp = net_netlink_open()) == NULL)
+		return -1;
+	if (!fgets(buf, sizeof(buf), fp)) {
+		fclose(fp);
+		return -1;
+	}
+
+	while (fgets(buf, sizeof(buf), fp)) {
+		sscanf(buf, "%llx %d %d %x %d %d %llx %d",
+		       &sk,
+		       &prot, &pid, &groups, &rq, &wq, &cb, &rc);
+
+		netlink_show_one(f, prot, pid, groups, 0, 0, 0, rq, wq, sk, cb);
+	}
+
+	fclose(fp);
+	return 0;
+}
+
+static bool vsock_type_skip(struct sockstat *s, struct filter *f)
+{
+	if (s->type == SOCK_STREAM && !(f->dbs & (1 << VSOCK_ST_DB)))
+		return true;
+	if (s->type == SOCK_DGRAM && !(f->dbs & (1 << VSOCK_DG_DB)))
+		return true;
+	return false;
+}
+
+static void vsock_addr_print(inet_prefix *a, __u32 port)
+{
+	char cid_str[sizeof("4294967295")];
+	char port_str[sizeof("4294967295")];
+	__u32 cid;
+
+	memcpy(&cid, a->data, sizeof(cid));
+
+	if (cid == ~(__u32)0)
+		snprintf(cid_str, sizeof(cid_str), "*");
+	else
+		snprintf(cid_str, sizeof(cid_str), "%u", cid);
+
+	if (port == ~(__u32)0)
+		snprintf(port_str, sizeof(port_str), "*");
+	else
+		snprintf(port_str, sizeof(port_str), "%u", port);
+
+	sock_addr_print(cid_str, ":", port_str, NULL);
+}
+
+static void vsock_stats_print(struct sockstat *s, struct filter *f)
+{
+	sock_state_print(s);
+
+	vsock_addr_print(&s->local, s->lport);
+	vsock_addr_print(&s->remote, s->rport);
+
+	proc_ctx_print(s);
+}
+
+static int vsock_show_sock(struct nlmsghdr *nlh, void *arg)
+{
+	struct filter *f = (struct filter *)arg;
+	struct vsock_diag_msg *r = NLMSG_DATA(nlh);
+	struct sockstat stat = {
+		.type = r->vdiag_type,
+		.lport = r->vdiag_src_port,
+		.rport = r->vdiag_dst_port,
+		.state = r->vdiag_state,
+		.ino = r->vdiag_ino,
+	};
+
+	vsock_set_inet_prefix(&stat.local, r->vdiag_src_cid);
+	vsock_set_inet_prefix(&stat.remote, r->vdiag_dst_cid);
+
+	if (vsock_type_skip(&stat, f))
+		return 0;
+
+	if (f->f && run_ssfilter(f->f, &stat) == 0)
+		return 0;
+
+	vsock_stats_print(&stat, f);
+
+	return 0;
+}
+
+static int vsock_show(struct filter *f)
+{
+	DIAG_REQUEST(req, struct vsock_diag_req r);
+
+	if (!filter_af_get(f, AF_VSOCK))
+		return 0;
+
+	req.r.sdiag_family = AF_VSOCK;
+	req.r.vdiag_states = f->states;
+
+	return handle_netlink_request(f, &req.nlh, sizeof(req), vsock_show_sock);
+}
+
+static void tipc_sock_addr_print(struct rtattr *net_addr, struct rtattr *id)
+{
+	uint32_t node = rta_getattr_u32(net_addr);
+	uint32_t identity = rta_getattr_u32(id);
+
+	SPRINT_BUF(addr) = {};
+	SPRINT_BUF(port) = {};
+
+	sprintf(addr, "%u", node);
+	sprintf(port, "%u", identity);
+	sock_addr_print(addr, ":", port, NULL);
+
+}
+
+static int tipc_show_sock(struct nlmsghdr *nlh, void *arg)
+{
+	struct rtattr *stat[TIPC_NLA_SOCK_STAT_MAX + 1] = {};
+	struct rtattr *attrs[TIPC_NLA_SOCK_MAX + 1] = {};
+	struct rtattr *con[TIPC_NLA_CON_MAX + 1] = {};
+	struct rtattr *info[TIPC_NLA_MAX + 1] = {};
+	struct rtattr *msg_ref;
+	struct sockstat ss = {};
+
+	parse_rtattr(info, TIPC_NLA_MAX, NLMSG_DATA(nlh),
+		     NLMSG_PAYLOAD(nlh, 0));
+
+	if (!info[TIPC_NLA_SOCK])
+		return 0;
+
+	msg_ref = info[TIPC_NLA_SOCK];
+	parse_rtattr(attrs, TIPC_NLA_SOCK_MAX, RTA_DATA(msg_ref),
+		     RTA_PAYLOAD(msg_ref));
+
+	msg_ref = attrs[TIPC_NLA_SOCK_STAT];
+	parse_rtattr(stat, TIPC_NLA_SOCK_STAT_MAX,
+		     RTA_DATA(msg_ref), RTA_PAYLOAD(msg_ref));
+
+
+	ss.local.family = AF_TIPC;
+	ss.type = rta_getattr_u32(attrs[TIPC_NLA_SOCK_TYPE]);
+	ss.state = rta_getattr_u32(attrs[TIPC_NLA_SOCK_TIPC_STATE]);
+	ss.uid = rta_getattr_u32(attrs[TIPC_NLA_SOCK_UID]);
+	ss.ino = rta_getattr_u32(attrs[TIPC_NLA_SOCK_INO]);
+	ss.rq = rta_getattr_u32(stat[TIPC_NLA_SOCK_STAT_RCVQ]);
+	ss.wq = rta_getattr_u32(stat[TIPC_NLA_SOCK_STAT_SENDQ]);
+	ss.sk = rta_getattr_u64(attrs[TIPC_NLA_SOCK_COOKIE]);
+
+	sock_state_print (&ss);
+
+	tipc_sock_addr_print(attrs[TIPC_NLA_SOCK_ADDR],
+			     attrs[TIPC_NLA_SOCK_REF]);
+
+	msg_ref = attrs[TIPC_NLA_SOCK_CON];
+	if (msg_ref) {
+		parse_rtattr(con, TIPC_NLA_CON_MAX,
+			     RTA_DATA(msg_ref), RTA_PAYLOAD(msg_ref));
+
+		tipc_sock_addr_print(con[TIPC_NLA_CON_NODE],
+				     con[TIPC_NLA_CON_SOCK]);
+	} else
+		sock_addr_print("", "-", "", NULL);
+
+	if (show_details)
+		sock_details_print(&ss);
+
+	proc_ctx_print(&ss);
+
+	if (show_tipcinfo) {
+		if (oneline)
+			out(" type:%s", stype_nameg[ss.type]);
+		else
+			out("\n type:%s", stype_nameg[ss.type]);
+		out(" cong:%s ",
+		       stat[TIPC_NLA_SOCK_STAT_LINK_CONG] ? "link" :
+		       stat[TIPC_NLA_SOCK_STAT_CONN_CONG] ? "conn" : "none");
+		out(" drop:%d ",
+		       rta_getattr_u32(stat[TIPC_NLA_SOCK_STAT_DROP]));
+
+		if (attrs[TIPC_NLA_SOCK_HAS_PUBL])
+			out(" publ");
+
+		if (con[TIPC_NLA_CON_FLAG])
+			out(" via {%u,%u} ",
+			       rta_getattr_u32(con[TIPC_NLA_CON_TYPE]),
+			       rta_getattr_u32(con[TIPC_NLA_CON_INST]));
+	}
+
+	return 0;
+}
+
+static int tipc_show(struct filter *f)
+{
+	DIAG_REQUEST(req, struct tipc_sock_diag_req r);
+
+	memset(&req.r, 0, sizeof(req.r));
+	req.r.sdiag_family = AF_TIPC;
+	req.r.tidiag_states = f->states;
+
+	return handle_netlink_request(f, &req.nlh, sizeof(req), tipc_show_sock);
+}
+
+struct sock_diag_msg {
+	__u8 sdiag_family;
+};
+
+static int generic_show_sock(struct nlmsghdr *nlh, void *arg)
+{
+	struct sock_diag_msg *r = NLMSG_DATA(nlh);
+	struct inet_diag_arg inet_arg = { .f = arg, .protocol = IPPROTO_MAX };
+	int ret;
+
+	switch (r->sdiag_family) {
+	case AF_INET:
+	case AF_INET6:
+		inet_arg.rth = inet_arg.f->rth_for_killing;
+		ret = show_one_inet_sock(nlh, &inet_arg);
+		break;
+	case AF_UNIX:
+		ret = unix_show_sock(nlh, arg);
+		break;
+	case AF_PACKET:
+		ret = packet_show_sock(nlh, arg);
+		break;
+	case AF_NETLINK:
+		ret = netlink_show_sock(nlh, arg);
+		break;
+	case AF_VSOCK:
+		ret = vsock_show_sock(nlh, arg);
+		break;
+	case AF_XDP:
+		ret = xdp_show_sock(nlh, arg);
+		break;
+	default:
+		ret = -1;
+	}
+
+	render();
+
+	return ret;
+}
+
+static int handle_follow_request(struct filter *f)
+{
+	int ret = 0;
+	int groups = 0;
+	struct rtnl_handle rth, rth2;
+
+	if (f->families & FAMILY_MASK(AF_INET) && f->dbs & (1 << TCP_DB))
+		groups |= 1 << (SKNLGRP_INET_TCP_DESTROY - 1);
+	if (f->families & FAMILY_MASK(AF_INET) && f->dbs & (1 << UDP_DB))
+		groups |= 1 << (SKNLGRP_INET_UDP_DESTROY - 1);
+	if (f->families & FAMILY_MASK(AF_INET6) && f->dbs & (1 << TCP_DB))
+		groups |= 1 << (SKNLGRP_INET6_TCP_DESTROY - 1);
+	if (f->families & FAMILY_MASK(AF_INET6) && f->dbs & (1 << UDP_DB))
+		groups |= 1 << (SKNLGRP_INET6_UDP_DESTROY - 1);
+
+	if (groups == 0)
+		return -1;
+
+	if (rtnl_open_byproto(&rth, groups, NETLINK_SOCK_DIAG))
+		return -1;
+
+	rth.dump = 0;
+	rth.local.nl_pid = 0;
+
+	if (f->kill) {
+		if (rtnl_open_byproto(&rth2, groups, NETLINK_SOCK_DIAG)) {
+			rtnl_close(&rth);
+			return -1;
+		}
+		f->rth_for_killing = &rth2;
+	}
+
+	if (rtnl_dump_filter(&rth, generic_show_sock, f))
+		ret = -1;
+
+	rtnl_close(&rth);
+	if (f->rth_for_killing)
+		rtnl_close(f->rth_for_killing);
+	return ret;
+}
+
+static int get_snmp_int(char *proto, char *key, int *result)
+{
+	char buf[1024];
+	FILE *fp;
+	int protolen = strlen(proto);
+	int keylen = strlen(key);
+
+	*result = 0;
+
+	if ((fp = net_snmp_open()) == NULL)
+		return -1;
+
+	while (fgets(buf, sizeof(buf), fp) != NULL) {
+		char *p = buf;
+		int  pos = 0;
+
+		if (memcmp(buf, proto, protolen))
+			continue;
+		while ((p = strchr(p, ' ')) != NULL) {
+			pos++;
+			p++;
+			if (memcmp(p, key, keylen) == 0 &&
+			    (p[keylen] == ' ' || p[keylen] == '\n'))
+				break;
+		}
+		if (fgets(buf, sizeof(buf), fp) == NULL)
+			break;
+		if (memcmp(buf, proto, protolen))
+			break;
+		p = buf;
+		while ((p = strchr(p, ' ')) != NULL) {
+			p++;
+			if (--pos == 0) {
+				sscanf(p, "%d", result);
+				fclose(fp);
+				return 0;
+			}
+		}
+	}
+
+	fclose(fp);
+	errno = ESRCH;
+	return -1;
+}
+
+
+/* Get stats from sockstat */
+
+struct ssummary {
+	int socks;
+	int tcp_mem;
+	int tcp_total;
+	int tcp_orphans;
+	int tcp_tws;
+	int tcp4_hashed;
+	int udp4;
+	int raw4;
+	int frag4;
+	int frag4_mem;
+	int tcp6_hashed;
+	int udp6;
+	int raw6;
+	int frag6;
+	int frag6_mem;
+};
+
+static void get_sockstat_line(char *line, struct ssummary *s)
+{
+	char id[256], rem[256];
+
+	if (sscanf(line, "%[^ ] %[^\n]\n", id, rem) != 2)
+		return;
+
+	if (strcmp(id, "sockets:") == 0)
+		sscanf(rem, "%*s%d", &s->socks);
+	else if (strcmp(id, "UDP:") == 0)
+		sscanf(rem, "%*s%d", &s->udp4);
+	else if (strcmp(id, "UDP6:") == 0)
+		sscanf(rem, "%*s%d", &s->udp6);
+	else if (strcmp(id, "RAW:") == 0)
+		sscanf(rem, "%*s%d", &s->raw4);
+	else if (strcmp(id, "RAW6:") == 0)
+		sscanf(rem, "%*s%d", &s->raw6);
+	else if (strcmp(id, "TCP6:") == 0)
+		sscanf(rem, "%*s%d", &s->tcp6_hashed);
+	else if (strcmp(id, "FRAG:") == 0)
+		sscanf(rem, "%*s%d%*s%d", &s->frag4, &s->frag4_mem);
+	else if (strcmp(id, "FRAG6:") == 0)
+		sscanf(rem, "%*s%d%*s%d", &s->frag6, &s->frag6_mem);
+	else if (strcmp(id, "TCP:") == 0)
+		sscanf(rem, "%*s%d%*s%d%*s%d%*s%d%*s%d",
+		       &s->tcp4_hashed,
+		       &s->tcp_orphans, &s->tcp_tws, &s->tcp_total, &s->tcp_mem);
+}
+
+static int get_sockstat(struct ssummary *s)
+{
+	char buf[256];
+	FILE *fp;
+
+	memset(s, 0, sizeof(*s));
+
+	if ((fp = net_sockstat_open()) == NULL)
+		return -1;
+	while (fgets(buf, sizeof(buf), fp) != NULL)
+		get_sockstat_line(buf, s);
+	fclose(fp);
+
+	if ((fp = net_sockstat6_open()) == NULL)
+		return 0;
+	while (fgets(buf, sizeof(buf), fp) != NULL)
+		get_sockstat_line(buf, s);
+	fclose(fp);
+
+	return 0;
+}
+
+static int print_summary(void)
+{
+	struct ssummary s;
+	int tcp_estab;
+
+	if (get_sockstat(&s) < 0)
+		perror("ss: get_sockstat");
+	if (get_snmp_int("Tcp:", "CurrEstab", &tcp_estab) < 0)
+		perror("ss: get_snmpstat");
+
+	printf("Total: %d\n", s.socks);
+
+	printf("TCP:   %d (estab %d, closed %d, orphaned %d, timewait %d)\n",
+	       s.tcp_total + s.tcp_tws, tcp_estab,
+	       s.tcp_total - (s.tcp4_hashed + s.tcp6_hashed - s.tcp_tws),
+	       s.tcp_orphans, s.tcp_tws);
+
+	printf("\n");
+	printf("Transport Total     IP        IPv6\n");
+	printf("RAW	  %-9d %-9d %-9d\n", s.raw4+s.raw6, s.raw4, s.raw6);
+	printf("UDP	  %-9d %-9d %-9d\n", s.udp4+s.udp6, s.udp4, s.udp6);
+	printf("TCP	  %-9d %-9d %-9d\n", s.tcp4_hashed+s.tcp6_hashed, s.tcp4_hashed, s.tcp6_hashed);
+	printf("INET	  %-9d %-9d %-9d\n",
+	       s.raw4+s.udp4+s.tcp4_hashed+
+	       s.raw6+s.udp6+s.tcp6_hashed,
+	       s.raw4+s.udp4+s.tcp4_hashed,
+	       s.raw6+s.udp6+s.tcp6_hashed);
+	printf("FRAG	  %-9d %-9d %-9d\n", s.frag4+s.frag6, s.frag4, s.frag6);
+
+	printf("\n");
+
+	return 0;
+}
+
+static void _usage(FILE *dest)
+{
+	fprintf(dest,
+"Usage: ss [ OPTIONS ]\n"
+"       ss [ OPTIONS ] [ FILTER ]\n"
+"   -h, --help          this message\n"
+"   -V, --version       output version information\n"
+"   -n, --numeric       don't resolve service names\n"
+"   -r, --resolve       resolve host names\n"
+"   -a, --all           display all sockets\n"
+"   -l, --listening     display listening sockets\n"
+"   -B, --bound-inactive display TCP bound but inactive sockets\n"
+"   -o, --options       show timer information\n"
+"   -e, --extended      show detailed socket information\n"
+"   -m, --memory        show socket memory usage\n"
+"   -p, --processes     show process using socket\n"
+"   -T, --threads       show thread using socket\n"
+"   -i, --info          show internal TCP information\n"
+"       --tipcinfo      show internal tipc socket information\n"
+"   -s, --summary       show socket usage summary\n"
+"       --tos           show tos and priority information\n"
+"       --cgroup        show cgroup information\n"
+"   -b, --bpf           show bpf filter socket information\n"
+"   -E, --events        continually display sockets as they are destroyed\n"
+"   -Z, --context       display task SELinux security contexts\n"
+"   -z, --contexts      display task and socket SELinux security contexts\n"
+"   -N, --net           switch to the specified network namespace name\n"
+"\n"
+"   -4, --ipv4          display only IP version 4 sockets\n"
+"   -6, --ipv6          display only IP version 6 sockets\n"
+"   -0, --packet        display PACKET sockets\n"
+"   -t, --tcp           display only TCP sockets\n"
+"   -M, --mptcp         display only MPTCP sockets\n"
+"   -S, --sctp          display only SCTP sockets\n"
+"   -u, --udp           display only UDP sockets\n"
+"   -d, --dccp          display only DCCP sockets\n"
+"   -w, --raw           display only RAW sockets\n"
+"   -x, --unix          display only Unix domain sockets\n"
+"       --tipc          display only TIPC sockets\n"
+"       --vsock         display only vsock sockets\n"
+"       --xdp           display only XDP sockets\n"
+"   -f, --family=FAMILY display sockets of type FAMILY\n"
+"       FAMILY := {inet|inet6|link|unix|netlink|vsock|tipc|xdp|help}\n"
+"\n"
+"   -K, --kill          forcibly close sockets, display what was closed\n"
+"   -H, --no-header     Suppress header line\n"
+"   -O, --oneline       socket's data printed on a single line\n"
+"       --inet-sockopt  show various inet socket options\n"
+"\n"
+"   -A, --query=QUERY, --socket=QUERY\n"
+"       QUERY := {all|inet|tcp|mptcp|udp|raw|unix|unix_dgram|unix_stream|unix_seqpacket|packet|packet_raw|packet_dgram|netlink|dccp|sctp|vsock_stream|vsock_dgram|tipc|xdp}[,QUERY]\n"
+"\n"
+"   -D, --diag=FILE     Dump raw information about TCP sockets to FILE\n"
+"   -F, --filter=FILE   read filter information from FILE\n"
+"       FILTER := [ state STATE-FILTER ] [ EXPRESSION ]\n"
+"       STATE-FILTER := {all|connected|synchronized|bucket|big|TCP-STATES}\n"
+"         TCP-STATES := {established|syn-sent|syn-recv|fin-wait-{1,2}|time-wait|closed|close-wait|last-ack|listening|closing}\n"
+"          connected := {established|syn-sent|syn-recv|fin-wait-{1,2}|time-wait|close-wait|last-ack|closing}\n"
+"       synchronized := {established|syn-recv|fin-wait-{1,2}|time-wait|close-wait|last-ack|closing}\n"
+"             bucket := {syn-recv|time-wait}\n"
+"                big := {established|syn-sent|fin-wait-{1,2}|closed|close-wait|last-ack|listening|closing}\n"
+		);
+}
+
+static void help(void) __attribute__((noreturn));
+static void help(void)
+{
+	_usage(stdout);
+	exit(0);
+}
+
+static void usage(void) __attribute__((noreturn));
+static void usage(void)
+{
+	_usage(stderr);
+	exit(-1);
+}
+
+
+static int scan_state(const char *state)
+{
+	static const char * const sstate_namel[] = {
+		"UNKNOWN",
+		[SS_ESTABLISHED] = "established",
+		[SS_SYN_SENT] = "syn-sent",
+		[SS_SYN_RECV] = "syn-recv",
+		[SS_FIN_WAIT1] = "fin-wait-1",
+		[SS_FIN_WAIT2] = "fin-wait-2",
+		[SS_TIME_WAIT] = "time-wait",
+		[SS_CLOSE] = "unconnected",
+		[SS_CLOSE_WAIT] = "close-wait",
+		[SS_LAST_ACK] = "last-ack",
+		[SS_LISTEN] =	"listening",
+		[SS_CLOSING] = "closing",
+		[SS_NEW_SYN_RECV] = "new-syn-recv",
+		[SS_BOUND_INACTIVE] = "bound-inactive",
+	};
+	int i;
+
+	/* NEW_SYN_RECV is a kernel implementation detail. It shouldn't be used
+	 * or even be visible by users.
+	 */
+	if (strcasecmp(state, "new-syn-recv") == 0)
+		goto wrong_state;
+
+	if (strcasecmp(state, "close") == 0 ||
+	    strcasecmp(state, "closed") == 0)
+		return (1<<SS_CLOSE);
+	if (strcasecmp(state, "syn-rcv") == 0)
+		return (1<<SS_SYN_RECV);
+	if (strcasecmp(state, "established") == 0)
+		return (1<<SS_ESTABLISHED);
+	if (strcasecmp(state, "all") == 0)
+		return SS_ALL;
+	if (strcasecmp(state, "connected") == 0)
+		return SS_ALL & ~((1<<SS_CLOSE)|(1<<SS_LISTEN));
+	if (strcasecmp(state, "synchronized") == 0)
+		return SS_ALL & ~((1<<SS_CLOSE)|(1<<SS_LISTEN)|(1<<SS_SYN_SENT));
+	if (strcasecmp(state, "bucket") == 0)
+		return (1<<SS_SYN_RECV)|(1<<SS_TIME_WAIT);
+	if (strcasecmp(state, "big") == 0)
+		return SS_ALL & ~((1<<SS_SYN_RECV)|(1<<SS_TIME_WAIT));
+	for (i = 0; i < SS_MAX; i++) {
+		if (strcasecmp(state, sstate_namel[i]) == 0)
+			return (1<<i);
+	}
+
+wrong_state:
+	fprintf(stderr, "ss: wrong state name: %s\n", state);
+	exit(-1);
+}
+
+/* Values 'v' and 'V' are already used so a non-character is used */
+#define OPT_VSOCK 256
+
+/* Values of 't' are already used so a non-character is used */
+#define OPT_TIPCSOCK 257
+#define OPT_TIPCINFO 258
+
+#define OPT_TOS 259
+
+/* Values of 'x' are already used so a non-character is used */
+#define OPT_XDPSOCK 260
+
+#define OPT_CGROUP 261
+
+#define OPT_INET_SOCKOPT 262
+
+static const struct option long_opts[] = {
+	{ "numeric", 0, 0, 'n' },
+	{ "resolve", 0, 0, 'r' },
+	{ "options", 0, 0, 'o' },
+	{ "extended", 0, 0, 'e' },
+	{ "memory", 0, 0, 'm' },
+	{ "info", 0, 0, 'i' },
+	{ "processes", 0, 0, 'p' },
+	{ "threads", 0, 0, 'T' },
+	{ "bpf", 0, 0, 'b' },
+	{ "events", 0, 0, 'E' },
+	{ "dccp", 0, 0, 'd' },
+	{ "tcp", 0, 0, 't' },
+	{ "sctp", 0, 0, 'S' },
+	{ "udp", 0, 0, 'u' },
+	{ "raw", 0, 0, 'w' },
+	{ "unix", 0, 0, 'x' },
+	{ "tipc", 0, 0, OPT_TIPCSOCK},
+	{ "vsock", 0, 0, OPT_VSOCK },
+	{ "all", 0, 0, 'a' },
+	{ "listening", 0, 0, 'l' },
+	{ "bound-inactive", 0, 0, 'B' },
+	{ "ipv4", 0, 0, '4' },
+	{ "ipv6", 0, 0, '6' },
+	{ "packet", 0, 0, '0' },
+	{ "family", 1, 0, 'f' },
+	{ "socket", 1, 0, 'A' },
+	{ "query", 1, 0, 'A' },
+	{ "summary", 0, 0, 's' },
+	{ "diag", 1, 0, 'D' },
+	{ "filter", 1, 0, 'F' },
+	{ "version", 0, 0, 'V' },
+	{ "help", 0, 0, 'h' },
+	{ "context", 0, 0, 'Z' },
+	{ "contexts", 0, 0, 'z' },
+	{ "net", 1, 0, 'N' },
+	{ "tipcinfo", 0, 0, OPT_TIPCINFO},
+	{ "tos", 0, 0, OPT_TOS },
+	{ "cgroup", 0, 0, OPT_CGROUP },
+	{ "kill", 0, 0, 'K' },
+	{ "no-header", 0, 0, 'H' },
+	{ "xdp", 0, 0, OPT_XDPSOCK},
+	{ "mptcp", 0, 0, 'M' },
+	{ "oneline", 0, 0, 'O' },
+	{ "inet-sockopt", 0, 0, OPT_INET_SOCKOPT },
+	{ 0 }
+
+};
+
+int main(int argc, char *argv[])
+{
+	int saw_states = 0;
+	int saw_query = 0;
+	int do_summary = 0;
+	const char *dump_tcpdiag = NULL;
+	FILE *filter_fp = NULL;
+	int ch;
+	int state_filter = 0;
+
+	while ((ch = getopt_long(argc, argv,
+				 "dhalBetuwxnro460spTbEf:mMiA:D:F:vVzZN:KHSO",
+				 long_opts, NULL)) != EOF) {
+		switch (ch) {
+		case 'n':
+			numeric = 1;
+			break;
+		case 'r':
+			resolve_hosts = 1;
+			break;
+		case 'o':
+			show_options = 1;
+			break;
+		case 'e':
+			show_options = 1;
+			show_details++;
+			break;
+		case 'm':
+			show_mem = 1;
+			break;
+		case 'i':
+			show_tcpinfo = 1;
+			break;
+		case 'p':
+			show_processes++;
+			break;
+		case 'T':
+			show_threads++;
+			break;
+		case 'b':
+			show_options = 1;
+			show_bpf++;
+			break;
+		case 'E':
+			follow_events = 1;
+			break;
+		case 'd':
+			filter_db_set(&current_filter, DCCP_DB, true);
+			break;
+		case 't':
+			filter_db_set(&current_filter, TCP_DB, true);
+			break;
+		case 'S':
+			filter_db_set(&current_filter, SCTP_DB, true);
+			break;
+		case 'u':
+			filter_db_set(&current_filter, UDP_DB, true);
+			break;
+		case 'w':
+			filter_db_set(&current_filter, RAW_DB, true);
+			break;
+		case 'x':
+			filter_af_set(&current_filter, AF_UNIX);
+			break;
+		case OPT_VSOCK:
+			filter_af_set(&current_filter, AF_VSOCK);
+			break;
+		case OPT_TIPCSOCK:
+			filter_af_set(&current_filter, AF_TIPC);
+			break;
+		case 'a':
+			state_filter = SS_ALL;
+			break;
+		case 'l':
+			state_filter = (1 << SS_LISTEN) | (1 << SS_CLOSE);
+			break;
+		case 'B':
+			state_filter = 1 << SS_BOUND_INACTIVE;
+			break;
+		case '4':
+			filter_af_set(&current_filter, AF_INET);
+			break;
+		case '6':
+			filter_af_set(&current_filter, AF_INET6);
+			break;
+		case '0':
+			filter_af_set(&current_filter, AF_PACKET);
+			break;
+		case OPT_XDPSOCK:
+			filter_af_set(&current_filter, AF_XDP);
+			break;
+		case 'M':
+			filter_db_set(&current_filter, MPTCP_DB, true);
+			break;
+		case 'f':
+			if (strcmp(optarg, "inet") == 0)
+				filter_af_set(&current_filter, AF_INET);
+			else if (strcmp(optarg, "inet6") == 0)
+				filter_af_set(&current_filter, AF_INET6);
+			else if (strcmp(optarg, "link") == 0)
+				filter_af_set(&current_filter, AF_PACKET);
+			else if (strcmp(optarg, "unix") == 0)
+				filter_af_set(&current_filter, AF_UNIX);
+			else if (strcmp(optarg, "netlink") == 0)
+				filter_af_set(&current_filter, AF_NETLINK);
+			else if (strcmp(optarg, "tipc") == 0)
+				filter_af_set(&current_filter, AF_TIPC);
+			else if (strcmp(optarg, "vsock") == 0)
+				filter_af_set(&current_filter, AF_VSOCK);
+			else if (strcmp(optarg, "xdp") == 0)
+				filter_af_set(&current_filter, AF_XDP);
+			else if (strcmp(optarg, "help") == 0)
+				help();
+			else {
+				fprintf(stderr, "ss: \"%s\" is invalid family\n",
+						optarg);
+				usage();
+			}
+			break;
+		case 'A':
+		{
+			char *p, *p1;
+
+			if (!saw_query) {
+				current_filter.dbs = 0;
+				state_filter = state_filter ?
+					       state_filter : SS_CONN;
+				saw_query = 1;
+				do_default = 0;
+			}
+			p = p1 = optarg;
+			do {
+				if ((p1 = strchr(p, ',')) != NULL)
+					*p1 = 0;
+				if (filter_db_parse(&current_filter, p)) {
+					fprintf(stderr, "ss: \"%s\" is illegal socket table id\n", p);
+					usage();
+				}
+				p = p1 + 1;
+			} while (p1);
+			break;
+		}
+		case 's':
+			do_summary = 1;
+			break;
+		case 'D':
+			dump_tcpdiag = optarg;
+			break;
+		case 'F':
+			if (filter_fp) {
+				fprintf(stderr, "More than one filter file\n");
+				exit(-1);
+			}
+			if (optarg[0] == '-')
+				filter_fp = stdin;
+			else
+				filter_fp = fopen(optarg, "r");
+			if (!filter_fp) {
+				perror("fopen filter file");
+				exit(-1);
+			}
+			break;
+		case 'v':
+		case 'V':
+			printf("ss utility, iproute2-%s\n", version);
+			exit(0);
+		case 'z':
+			show_sock_ctx++;
+			/* fall through */
+		case 'Z':
+			if (!is_selinux_enabled()) {
+				fprintf(stderr, "ss: SELinux is not enabled.\n");
+				exit(1);
+			}
+			show_proc_ctx++;
+			break;
+		case 'N':
+			if (netns_switch(optarg))
+				exit(1);
+			break;
+		case OPT_TIPCINFO:
+			show_tipcinfo = 1;
+			break;
+		case OPT_TOS:
+			show_tos = 1;
+			break;
+		case OPT_CGROUP:
+			show_cgroup = 1;
+			break;
+		case 'K':
+			current_filter.kill = 1;
+			break;
+		case 'H':
+			show_header = 0;
+			break;
+		case 'O':
+			oneline = 1;
+			break;
+		case OPT_INET_SOCKOPT:
+			show_inet_sockopt = 1;
+			break;
+		case 'h':
+			help();
+		case '?':
+		default:
+			usage();
+		}
+	}
+
+	if (show_processes || show_threads || show_proc_ctx || show_sock_ctx)
+		user_ent_hash_build();
+
+	argc -= optind;
+	argv += optind;
+
+	if (do_summary) {
+		print_summary();
+		if (do_default && argc == 0)
+			exit(0);
+	}
+
+	while (argc > 0) {
+		if (strcmp(*argv, "state") == 0) {
+			NEXT_ARG();
+			if (!saw_states)
+				state_filter = 0;
+			state_filter |= scan_state(*argv);
+			saw_states = 1;
+		} else if (strcmp(*argv, "exclude") == 0 ||
+			   strcmp(*argv, "excl") == 0) {
+			NEXT_ARG();
+			if (!saw_states)
+				state_filter = SS_ALL;
+			state_filter &= ~scan_state(*argv);
+			saw_states = 1;
+		} else {
+			break;
+		}
+		argc--; argv++;
+	}
+
+	if (do_default) {
+		state_filter = state_filter ? state_filter : SS_CONN;
+		filter_db_parse(&current_filter, "all");
+	}
+
+	filter_states_set(&current_filter, state_filter);
+	filter_merge_defaults(&current_filter);
+
+#ifdef HAVE_RPC
+	if (!numeric && resolve_hosts &&
+	    (current_filter.dbs & (UNIX_DBM|INET_L4_DBM)))
+		init_service_resolver();
+#endif
+
+	if (current_filter.dbs == 0) {
+		fprintf(stderr, "ss: no socket tables to show with such filter.\n");
+		exit(0);
+	}
+	if (current_filter.families == 0) {
+		fprintf(stderr, "ss: no families to show with such filter.\n");
+		exit(0);
+	}
+	if (current_filter.states == 0) {
+		fprintf(stderr, "ss: no socket states to show with such filter.\n");
+		exit(0);
+	}
+
+	if (dump_tcpdiag) {
+		FILE *dump_fp = stdout;
+
+		if (!(current_filter.dbs & (1<<TCP_DB))) {
+			fprintf(stderr, "ss: tcpdiag dump requested and no tcp in filter.\n");
+			exit(0);
+		}
+		if (dump_tcpdiag[0] != '-') {
+			dump_fp = fopen(dump_tcpdiag, "w");
+			if (!dump_tcpdiag) {
+				perror("fopen dump file");
+				exit(-1);
+			}
+		}
+		inet_show_netlink(&current_filter, dump_fp, IPPROTO_TCP);
+		fflush(dump_fp);
+		exit(0);
+	}
+
+	if (ssfilter_parse(&current_filter.f, argc, argv, filter_fp))
+		usage();
+
+	if (!show_processes)
+		columns[COL_PROC].disabled = 1;
+
+	if (!(current_filter.dbs & (current_filter.dbs - 1)))
+		columns[COL_NETID].disabled = 1;
+
+	if (!(current_filter.states & (current_filter.states - 1)))
+		columns[COL_STATE].disabled = 1;
+
+	if (show_header)
+		print_header();
+
+	fflush(stdout);
+
+	if (follow_events)
+		exit(handle_follow_request(&current_filter));
+
+	if (current_filter.dbs & (1<<NETLINK_DB))
+		netlink_show(&current_filter);
+	if (current_filter.dbs & PACKET_DBM)
+		packet_show(&current_filter);
+	if (current_filter.dbs & UNIX_DBM)
+		unix_show(&current_filter);
+	if (current_filter.dbs & (1<<RAW_DB))
+		raw_show(&current_filter);
+	if (current_filter.dbs & (1<<UDP_DB))
+		udp_show(&current_filter);
+	if (current_filter.dbs & (1<<TCP_DB))
+		tcp_show(&current_filter);
+	if (current_filter.dbs & (1<<DCCP_DB))
+		dccp_show(&current_filter);
+	if (current_filter.dbs & (1<<SCTP_DB))
+		sctp_show(&current_filter);
+	if (current_filter.dbs & VSOCK_DBM)
+		vsock_show(&current_filter);
+	if (current_filter.dbs & (1<<TIPC_DB))
+		tipc_show(&current_filter);
+	if (current_filter.dbs & (1<<XDP_DB))
+		xdp_show(&current_filter);
+	if (current_filter.dbs & (1<<MPTCP_DB))
+		mptcp_show(&current_filter);
+
+	if (show_processes || show_threads || show_proc_ctx || show_sock_ctx)
+		user_ent_destroy();
+
+	render();
+
+	return 0;
+}
diff --git a/misc/ss_util.h b/misc/ss_util.h
new file mode 100644
index 0000000..37936c6
--- /dev/null
+++ b/misc/ss_util.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef __SS_UTIL_H__
+#define __SS_UTIL_H__
+
+#include <linux/sock_diag.h>
+#include <linux/inet_diag.h>
+
+#define MAGIC_SEQ 123456
+
+#define DIAG_REQUEST(_req, _r)						    \
+	struct {							    \
+		struct nlmsghdr nlh;					    \
+		_r;							    \
+	} _req = {							    \
+		.nlh = {						    \
+			.nlmsg_type = SOCK_DIAG_BY_FAMILY,		    \
+			.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST,\
+			.nlmsg_seq = MAGIC_SEQ,				    \
+			.nlmsg_len = sizeof(_req),			    \
+		},							    \
+	}
+
+#endif /* __SS_UTIL_H__ */
diff --git a/misc/ssfilter.h b/misc/ssfilter.h
new file mode 100644
index 0000000..73e55e0
--- /dev/null
+++ b/misc/ssfilter.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#include <stdbool.h>
+
+enum {
+	SSF_DCOND,
+	SSF_SCOND,
+	SSF_OR,
+	SSF_AND,
+	SSF_NOT,
+	SSF_D_GE,
+	SSF_D_LE,
+	SSF_S_GE,
+	SSF_S_LE,
+	SSF_S_AUTO,
+	SSF_DEVCOND,
+	SSF_MARKMASK,
+	SSF_CGROUPCOND,
+	SSF__MAX
+};
+
+bool ssfilter_is_supported(int type);
+
+struct ssfilter
+{
+	int type;
+	struct ssfilter *post;
+	struct ssfilter *pred;
+};
+
+int ssfilter_parse(struct ssfilter **f, int argc, char **argv, FILE *fp);
+void *parse_hostcond(char *addr, bool is_port);
+void *parse_devcond(char *name);
+void *parse_markmask(const char *markmask);
+void *parse_cgroupcond(const char *path);
diff --git a/misc/ssfilter.y b/misc/ssfilter.y
new file mode 100644
index 0000000..3195723
--- /dev/null
+++ b/misc/ssfilter.y
@@ -0,0 +1,369 @@
+%{
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <malloc.h>
+#include <string.h>
+#include "ssfilter.h"
+
+typedef struct ssfilter * ssfilter_t;
+
+#define YYSTYPE ssfilter_t
+
+static struct ssfilter * alloc_node(int type, void *pred)
+{
+	struct ssfilter *n;
+
+	if (!ssfilter_is_supported(type)) {
+		fprintf(stderr, "It looks like such filter is not supported! Too old kernel?\n");
+		exit(-1);
+	}
+
+	n = malloc(sizeof(*n));
+	if (n == NULL)
+		abort();
+	n->type = type;
+	n->pred = pred;
+	n->post = NULL;
+	return n;
+}
+
+static char		**yy_argv;
+static int		yy_argc;
+static FILE		*yy_fp;
+static ssfilter_t	*yy_ret;
+static int tok_type = -1;
+
+static int yylex(void);
+
+static void yyerror(char *s)
+{
+	fprintf(stderr, "ss: bison bellows (while parsing filter): \"%s!\"", s);
+}
+
+%}
+
+%token HOSTCOND DCOND SCOND DPORT SPORT LEQ GEQ NEQ AUTOBOUND DEVCOND DEVNAME MARKMASK FWMARK CGROUPCOND CGROUPPATH
+%left '|'
+%left '&'
+%nonassoc '!'
+
+%%
+applet: exprlist
+        {
+                *yy_ret = $1;
+                $$ = $1;
+        }
+        | null
+        ;
+
+null:   /* NOTHING */ { $$ = NULL; }
+        ;
+
+exprlist: expr
+        | exprlist '|' expr
+        {
+                $$ = alloc_node(SSF_OR, $1);
+                $$->post = $3;
+        }
+        | exprlist '&' expr
+        {
+                $$ = alloc_node(SSF_AND, $1);
+                $$->post = $3;
+        }
+        | exprlist expr
+        {
+                $$ = alloc_node(SSF_AND, $1);
+                $$->post = $2;
+        }
+        ;
+
+eq:	'='
+	| /* nothing */
+	;
+
+expr:	'(' exprlist ')'
+	{
+		$$ = $2;
+	}
+	| '!' expr
+	{
+		$$ = alloc_node(SSF_NOT, $2);
+	}
+	| DCOND eq HOSTCOND
+        {
+		$$ = alloc_node(SSF_DCOND, $3);
+        }
+        | SCOND eq HOSTCOND
+        {
+		$$ = alloc_node(SSF_SCOND, $3);
+        }
+        | DPORT GEQ HOSTCOND
+        {
+                $$ = alloc_node(SSF_D_GE, $3);
+        }
+        | DPORT LEQ HOSTCOND
+        {
+                $$ = alloc_node(SSF_D_LE, $3);
+        }
+        | DPORT '>' HOSTCOND
+        {
+                $$ = alloc_node(SSF_NOT, alloc_node(SSF_D_LE, $3));
+        }
+        | DPORT '<' HOSTCOND
+        {
+                $$ = alloc_node(SSF_NOT, alloc_node(SSF_D_GE, $3));
+        }
+        | DPORT eq HOSTCOND
+        {
+		$$ = alloc_node(SSF_DCOND, $3);
+        }
+        | DPORT NEQ HOSTCOND
+        {
+		$$ = alloc_node(SSF_NOT, alloc_node(SSF_DCOND, $3));
+        }
+
+        | SPORT GEQ HOSTCOND
+        {
+                $$ = alloc_node(SSF_S_GE, $3);
+        }
+        | SPORT LEQ HOSTCOND
+        {
+                $$ = alloc_node(SSF_S_LE, $3);
+        }
+        | SPORT '>' HOSTCOND
+        {
+                $$ = alloc_node(SSF_NOT, alloc_node(SSF_S_LE, $3));
+        }
+        | SPORT '<' HOSTCOND
+        {
+                $$ = alloc_node(SSF_NOT, alloc_node(SSF_S_GE, $3));
+        }
+        | SPORT eq HOSTCOND
+        {
+		$$ = alloc_node(SSF_SCOND, $3);
+        }
+        | SPORT NEQ HOSTCOND
+        {
+		$$ = alloc_node(SSF_NOT, alloc_node(SSF_SCOND, $3));
+        }
+        | DEVNAME eq DEVCOND
+        {
+		$$ = alloc_node(SSF_DEVCOND, $3);
+        }
+        | DEVNAME NEQ DEVCOND
+        {
+		$$ = alloc_node(SSF_NOT, alloc_node(SSF_DEVCOND, $3));
+        }
+        | FWMARK eq MARKMASK
+        {
+                $$ = alloc_node(SSF_MARKMASK, $3);
+        }
+        | FWMARK NEQ MARKMASK
+        {
+                $$ = alloc_node(SSF_NOT, alloc_node(SSF_MARKMASK, $3));
+        }
+        | CGROUPPATH eq CGROUPCOND
+        {
+                $$ = alloc_node(SSF_CGROUPCOND, $3);
+        }
+        | CGROUPPATH NEQ CGROUPCOND
+        {
+                $$ = alloc_node(SSF_NOT, alloc_node(SSF_CGROUPCOND, $3));
+        }
+        | AUTOBOUND
+        {
+                $$ = alloc_node(SSF_S_AUTO, NULL);
+        }
+;
+%%
+
+static char *get_token_from_line(char **ptr)
+{
+	char *tok, *cp = *ptr;
+
+	while (*cp == ' ' || *cp == '\t') cp++;
+
+	if (*cp == 0) {
+		*ptr = cp;
+		return NULL;
+	}
+
+	tok = cp;
+
+	while (*cp != 0 && *cp != ' ' && *cp != '\t') {
+		/* Backslash escapes everything. */
+		if (*cp == '\\') {
+			char *tp;
+			for (tp = cp; tp != tok; tp--)
+				*tp = *(tp-1);
+			cp++;
+			tok++;
+			if (*cp == 0)
+				break;
+		}
+		cp++;
+	}
+	if (*cp)
+		*cp++ = 0;
+	*ptr = cp;
+	return tok;
+}
+
+int yylex(void)
+{
+	static char argbuf[1024];
+	static char *tokptr = argbuf;
+	static int argc;
+	char *curtok;
+
+	do {
+		while (*tokptr == 0) {
+			tokptr = NULL;
+			if (argc < yy_argc) {
+				tokptr = yy_argv[argc];
+				argc++;
+			} else if (yy_fp) {
+				while (tokptr == NULL) {
+					size_t len;
+
+					if (fgets(argbuf, sizeof(argbuf), yy_fp) == NULL)
+						return 0;
+
+					len = strnlen(argbuf, sizeof(argbuf));
+					if (len == 0) {
+						fprintf(stderr, "Invalid line\n");
+						exit(-1);
+					}
+
+					if (len >= sizeof(argbuf) - 1) {
+						fprintf(stderr, "Too long line in filter\n");
+						exit(-1);
+					}
+					if (argbuf[len - 1] == '\n')
+						argbuf[len-1] = 0;
+					if (argbuf[0] == '#' || argbuf[0] == '0')
+						continue;
+					tokptr = argbuf;
+				}
+			} else {
+				return 0;
+			}
+		}
+	} while ((curtok = get_token_from_line(&tokptr)) == NULL);
+
+	if (strcmp(curtok, "!") == 0 ||
+	    strcmp(curtok, "not") == 0)
+		return '!';
+	if (strcmp(curtok, "&") == 0 ||
+	    strcmp(curtok, "&&") == 0 ||
+	    strcmp(curtok, "and") == 0)
+		return '&';
+	if (strcmp(curtok, "|") == 0 ||
+	    strcmp(curtok, "||") == 0 ||
+	    strcmp(curtok, "or") == 0)
+		return '|';
+	if (strcmp(curtok, "(") == 0)
+		return '(';
+	if (strcmp(curtok, ")") == 0)
+		return ')';
+	if (strcmp(curtok, "dst") == 0) {
+		tok_type = DCOND;
+		return DCOND;
+	}
+	if (strcmp(curtok, "src") == 0) {
+                tok_type = SCOND;
+		return SCOND;
+        }
+	if (strcmp(curtok, "dport") == 0) {
+		tok_type = DPORT;
+		return DPORT;
+	}
+	if (strcmp(curtok, "sport") == 0) {
+		tok_type = SPORT;
+		return SPORT;
+	}
+	if (strcmp(curtok, "dev") == 0) {
+		tok_type = DEVNAME;
+		return DEVNAME;
+	}
+	if (strcmp(curtok, "fwmark") == 0) {
+		tok_type = FWMARK;
+		return FWMARK;
+	}
+	if (strcmp(curtok, "cgroup") == 0) {
+		tok_type = CGROUPPATH;
+		return CGROUPPATH;
+	}
+	if (strcmp(curtok, ">=") == 0 ||
+	    strcmp(curtok, "ge") == 0 ||
+	    strcmp(curtok, "geq") == 0)
+		return GEQ;
+	if (strcmp(curtok, "<=") == 0 ||
+	    strcmp(curtok, "le") == 0 ||
+	    strcmp(curtok, "leq") == 0)
+		return LEQ;
+	if (strcmp(curtok, "!=") == 0 ||
+	    strcmp(curtok, "ne") == 0 ||
+	    strcmp(curtok, "neq") == 0)
+		return NEQ;
+	if (strcmp(curtok, "=") == 0 ||
+	    strcmp(curtok, "==") == 0 ||
+	    strcmp(curtok, "eq") == 0)
+		return '=';
+	if (strcmp(curtok, ">") == 0 ||
+	    strcmp(curtok, "gt") == 0)
+		return '>';
+	if (strcmp(curtok, "<") == 0 ||
+	    strcmp(curtok, "lt") == 0)
+		return '<';
+	if (strcmp(curtok, "autobound") == 0) {
+		tok_type = AUTOBOUND;
+		return AUTOBOUND;
+	}
+	if (tok_type == DEVNAME) {
+		yylval = (void*)parse_devcond(curtok);
+		if (yylval == NULL) {
+			fprintf(stderr, "Cannot parse device.\n");
+			exit(1);
+		}
+		return DEVCOND;
+	}
+	if (tok_type == FWMARK) {
+		yylval = (void*)parse_markmask(curtok);
+		if (yylval == NULL) {
+			fprintf(stderr, "Cannot parse mark %s.\n", curtok);
+			exit(1);
+		}
+		return MARKMASK;
+	}
+	if (tok_type == CGROUPPATH) {
+		yylval = (void*)parse_cgroupcond(curtok);
+		if (yylval == NULL) {
+			fprintf(stderr, "Cannot parse cgroup %s.\n", curtok);
+			exit(1);
+		}
+		return CGROUPCOND;
+	}
+	yylval = (void*)parse_hostcond(curtok, tok_type == SPORT || tok_type == DPORT);
+	if (yylval == NULL) {
+		fprintf(stderr, "Cannot parse dst/src address.\n");
+		exit(1);
+	}
+	return HOSTCOND;
+}
+
+int ssfilter_parse(struct ssfilter **f, int argc, char **argv, FILE *fp)
+{
+	yy_argc = argc;
+	yy_argv = argv;
+	yy_fp   = fp;
+	yy_ret  = f;
+
+	if (yyparse()) {
+		fprintf(stderr, " Sorry.\n");
+		return -1;
+	}
+	return 0;
+}
diff --git a/misc/ssfilter_check.c b/misc/ssfilter_check.c
new file mode 100644
index 0000000..02709ce
--- /dev/null
+++ b/misc/ssfilter_check.c
@@ -0,0 +1,104 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include "libnetlink.h"
+#include "ssfilter.h"
+#include "ss_util.h"
+
+static int dummy_filter(struct nlmsghdr *n, void *arg)
+{
+	/* just stops rtnl_dump_filter() */
+	return -1;
+}
+
+static bool cgroup_filter_check(void)
+{
+	struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
+	DIAG_REQUEST(req, struct inet_diag_req_v2 r);
+	struct instr {
+		struct inet_diag_bc_op op;
+		__u64 cgroup_id;
+	} __attribute__((packed));
+	int inslen = sizeof(struct instr);
+	struct instr instr = {
+		{ INET_DIAG_BC_CGROUP_COND, inslen, inslen + 4 },
+		0
+	};
+	struct rtnl_handle rth;
+	struct iovec iov[3];
+	struct msghdr msg;
+	struct rtattr rta;
+	int ret = false;
+	int iovlen = 3;
+
+	if (rtnl_open_byproto(&rth, 0, NETLINK_SOCK_DIAG))
+		return false;
+	rth.dump = MAGIC_SEQ;
+	rth.flags = RTNL_HANDLE_F_SUPPRESS_NLERR;
+
+	memset(&req.r, 0, sizeof(req.r));
+	req.r.sdiag_family = AF_INET;
+	req.r.sdiag_protocol = IPPROTO_TCP;
+	req.nlh.nlmsg_len += RTA_LENGTH(inslen);
+
+	rta.rta_type = INET_DIAG_REQ_BYTECODE;
+	rta.rta_len = RTA_LENGTH(inslen);
+
+	iov[0] = (struct iovec) { &req, sizeof(req) };
+	iov[1] = (struct iovec) { &rta, sizeof(rta) };
+	iov[2] = (struct iovec) { &instr, inslen };
+
+	msg = (struct msghdr) {
+		.msg_name = (void *)&nladdr,
+		.msg_namelen = sizeof(nladdr),
+		.msg_iov = iov,
+		.msg_iovlen = iovlen,
+	};
+
+	if (sendmsg(rth.fd, &msg, 0) < 0)
+		goto out;
+
+	if (rtnl_dump_filter(&rth, dummy_filter, NULL) < 0) {
+		ret = (errno != EINVAL);
+		goto out;
+	}
+
+	ret = true;
+
+out:
+	rtnl_close(&rth);
+
+	return ret;
+}
+
+
+struct filter_check_t {
+	bool (*check)(void);
+	unsigned int checked:1,
+		supported:1;
+};
+
+static struct filter_check_t filter_checks[SSF__MAX] = {
+	[SSF_CGROUPCOND] = { cgroup_filter_check, 0 },
+};
+
+bool ssfilter_is_supported(int type)
+{
+	struct filter_check_t f;
+
+	if (type >= SSF__MAX)
+		return false;
+
+	f = filter_checks[type];
+	if (!f.check)
+		return true;
+
+	if (!f.checked) {
+		f.supported = f.check();
+		f.checked = 1;
+	}
+
+	return f.supported;
+}