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-rw-r--r--ip/ipmroute.c325
1 files changed, 325 insertions, 0 deletions
diff --git a/ip/ipmroute.c b/ip/ipmroute.c
new file mode 100644
index 0000000..b6d9e61
--- /dev/null
+++ b/ip/ipmroute.c
@@ -0,0 +1,325 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * ipmroute.c "ip mroute".
+ *
+ * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+
+#include <linux/netdevice.h>
+#include <linux/if.h>
+#include <linux/if_arp.h>
+#include <linux/sockios.h>
+
+#include <rt_names.h>
+#include "utils.h"
+#include "ip_common.h"
+#include "json_print.h"
+
+static void usage(void) __attribute__((noreturn));
+
+static void usage(void)
+{
+ fprintf(stderr,
+ "Usage: ip mroute show [ [ to ] PREFIX ] [ from PREFIX ] [ iif DEVICE ]\n"
+ " [ table TABLE_ID ]\n"
+ "TABLE_ID := [ local | main | default | all | NUMBER ]\n"
+ );
+ exit(-1);
+}
+
+static struct rtfilter {
+ int tb;
+ int af;
+ int iif;
+ inet_prefix mdst;
+ inet_prefix msrc;
+} filter;
+
+int print_mroute(struct nlmsghdr *n, void *arg)
+{
+ struct rtmsg *r = NLMSG_DATA(n);
+ int len = n->nlmsg_len;
+ struct rtattr *tb[RTA_MAX+1];
+ FILE *fp = arg;
+ const char *src, *dst;
+ SPRINT_BUF(b1);
+ SPRINT_BUF(b2);
+ __u32 table;
+ int iif = 0;
+ int family;
+
+ if ((n->nlmsg_type != RTM_NEWROUTE &&
+ n->nlmsg_type != RTM_DELROUTE)) {
+ fprintf(stderr, "Not a multicast route: %08x %08x %08x\n",
+ n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
+ return 0;
+ }
+ len -= NLMSG_LENGTH(sizeof(*r));
+ if (len < 0) {
+ fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
+ return -1;
+ }
+
+ if (r->rtm_type != RTN_MULTICAST) {
+ fprintf(stderr,
+ "Non multicast route received, kernel does support IP multicast?\n");
+ return -1;
+ }
+
+ parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
+ table = rtm_get_table(r, tb);
+
+ if (filter.tb > 0 && filter.tb != table)
+ return 0;
+
+ if (tb[RTA_IIF])
+ iif = rta_getattr_u32(tb[RTA_IIF]);
+ if (filter.iif && filter.iif != iif)
+ return 0;
+
+ if (filter.af && filter.af != r->rtm_family)
+ return 0;
+
+ if (inet_addr_match_rta(&filter.mdst, tb[RTA_DST]))
+ return 0;
+
+ if (inet_addr_match_rta(&filter.msrc, tb[RTA_SRC]))
+ return 0;
+
+ family = get_real_family(r->rtm_type, r->rtm_family);
+
+ open_json_object(NULL);
+ if (n->nlmsg_type == RTM_DELROUTE)
+ print_bool(PRINT_ANY, "deleted", "Deleted ", true);
+
+ if (tb[RTA_SRC])
+ src = rt_addr_n2a_r(family, RTA_PAYLOAD(tb[RTA_SRC]),
+ RTA_DATA(tb[RTA_SRC]), b1, sizeof(b1));
+ else
+ src = "unknown";
+
+ if (tb[RTA_DST])
+ dst = rt_addr_n2a_r(family, RTA_PAYLOAD(tb[RTA_DST]),
+ RTA_DATA(tb[RTA_DST]), b2, sizeof(b2));
+ else
+ dst = "unknown";
+
+ if (is_json_context()) {
+ print_string(PRINT_JSON, "src", NULL, src);
+ print_string(PRINT_JSON, "dst", NULL, dst);
+ } else {
+ char obuf[256];
+
+ snprintf(obuf, sizeof(obuf), "(%s,%s)", src, dst);
+ print_string(PRINT_FP, NULL,
+ "%-32s Iif: ", obuf);
+ }
+
+ if (iif)
+ print_color_string(PRINT_ANY, COLOR_IFNAME,
+ "iif", "%-10s ", ll_index_to_name(iif));
+ else
+ print_string(PRINT_ANY,"iif", "%s ", "unresolved");
+
+ if (tb[RTA_MULTIPATH]) {
+ struct rtnexthop *nh = RTA_DATA(tb[RTA_MULTIPATH]);
+ int first = 1;
+
+ open_json_array(PRINT_JSON, "multipath");
+ len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
+
+ for (;;) {
+ if (len < sizeof(*nh))
+ break;
+ if (nh->rtnh_len > len)
+ break;
+
+ open_json_object(NULL);
+ if (first) {
+ print_string(PRINT_FP, NULL, "Oifs: ", NULL);
+ first = 0;
+ }
+
+ print_color_string(PRINT_ANY, COLOR_IFNAME,
+ "oif", "%s", ll_index_to_name(nh->rtnh_ifindex));
+
+ if (nh->rtnh_hops > 1)
+ print_uint(PRINT_ANY,
+ "ttl", "(ttl %u) ", nh->rtnh_hops);
+ else
+ print_string(PRINT_FP, NULL, " ", NULL);
+
+ close_json_object();
+ len -= NLMSG_ALIGN(nh->rtnh_len);
+ nh = RTNH_NEXT(nh);
+ }
+ close_json_array(PRINT_JSON, NULL);
+ }
+
+ print_string(PRINT_ANY, "state", " State: %s",
+ (r->rtm_flags & RTNH_F_UNRESOLVED) ? "unresolved" : "resolved");
+
+ if (r->rtm_flags & RTNH_F_OFFLOAD)
+ print_null(PRINT_ANY, "offload", " offload", NULL);
+
+ if (show_stats && tb[RTA_MFC_STATS]) {
+ struct rta_mfc_stats *mfcs = RTA_DATA(tb[RTA_MFC_STATS]);
+
+ print_nl();
+ print_u64(PRINT_ANY, "packets", " %"PRIu64" packets,",
+ mfcs->mfcs_packets);
+ print_u64(PRINT_ANY, "bytes", " %"PRIu64" bytes", mfcs->mfcs_bytes);
+
+ if (mfcs->mfcs_wrong_if)
+ print_u64(PRINT_ANY, "wrong_if",
+ ", %"PRIu64" arrived on wrong iif.",
+ mfcs->mfcs_wrong_if);
+ }
+
+ if (show_stats && tb[RTA_EXPIRES]) {
+ struct timeval tv;
+ double age;
+
+ __jiffies_to_tv(&tv, rta_getattr_u64(tb[RTA_EXPIRES]));
+ age = tv.tv_sec;
+ age += tv.tv_usec / 1000000.;
+ print_float(PRINT_ANY, "expires",
+ ", Age %.2f", age);
+ }
+
+ if (table && (table != RT_TABLE_MAIN || show_details > 0) && !filter.tb)
+ print_string(PRINT_ANY, "table", " Table: %s",
+ rtnl_rttable_n2a(table, b1, sizeof(b1)));
+
+ print_string(PRINT_FP, NULL, "\n", NULL);
+ close_json_object();
+ fflush(fp);
+ return 0;
+}
+
+void ipmroute_reset_filter(int ifindex)
+{
+ memset(&filter, 0, sizeof(filter));
+ filter.mdst.bitlen = -1;
+ filter.msrc.bitlen = -1;
+ filter.iif = ifindex;
+}
+
+static int iproute_dump_filter(struct nlmsghdr *nlh, int reqlen)
+{
+ int err;
+
+ if (filter.tb) {
+ err = addattr32(nlh, reqlen, RTA_TABLE, filter.tb);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+static int mroute_list(int argc, char **argv)
+{
+ char *id = NULL;
+ int family = preferred_family;
+
+ ipmroute_reset_filter(0);
+ if (family == AF_INET || family == AF_UNSPEC) {
+ family = RTNL_FAMILY_IPMR;
+ filter.af = RTNL_FAMILY_IPMR;
+ filter.tb = RT_TABLE_DEFAULT; /* for backward compatibility */
+ } else if (family == AF_INET6) {
+ family = RTNL_FAMILY_IP6MR;
+ filter.af = RTNL_FAMILY_IP6MR;
+ } else {
+ /* family does not have multicast routing */
+ return 0;
+ }
+
+ filter.msrc.family = filter.mdst.family = family;
+
+ while (argc > 0) {
+ if (matches(*argv, "table") == 0) {
+ __u32 tid;
+
+ NEXT_ARG();
+ if (rtnl_rttable_a2n(&tid, *argv)) {
+ if (strcmp(*argv, "all") == 0) {
+ filter.tb = 0;
+ } else if (strcmp(*argv, "help") == 0) {
+ usage();
+ } else {
+ invarg("table id value is invalid\n", *argv);
+ }
+ } else
+ filter.tb = tid;
+ } else if (strcmp(*argv, "iif") == 0) {
+ NEXT_ARG();
+ id = *argv;
+ } else if (matches(*argv, "from") == 0) {
+ NEXT_ARG();
+ if (get_prefix(&filter.msrc, *argv, family))
+ invarg("from value is invalid\n", *argv);
+ } else {
+ if (strcmp(*argv, "to") == 0) {
+ NEXT_ARG();
+ }
+ if (matches(*argv, "help") == 0)
+ usage();
+ if (get_prefix(&filter.mdst, *argv, family))
+ invarg("to value is invalid\n", *argv);
+ }
+ argc--; argv++;
+ }
+
+ ll_init_map(&rth);
+
+ if (id) {
+ int idx;
+
+ idx = ll_name_to_index(id);
+ if (!idx)
+ return nodev(id);
+ filter.iif = idx;
+ }
+
+ if (rtnl_routedump_req(&rth, filter.af, iproute_dump_filter) < 0) {
+ perror("Cannot send dump request");
+ return 1;
+ }
+
+ new_json_obj(json);
+ if (rtnl_dump_filter(&rth, print_mroute, stdout) < 0) {
+ delete_json_obj();
+ fprintf(stderr, "Dump terminated\n");
+ exit(1);
+ }
+ delete_json_obj();
+
+ return 0;
+}
+
+int do_multiroute(int argc, char **argv)
+{
+ if (argc < 1)
+ return mroute_list(0, NULL);
+
+ if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
+ || matches(*argv, "lst") == 0)
+ return mroute_list(argc-1, argv+1);
+ if (matches(*argv, "help") == 0)
+ usage();
+ fprintf(stderr, "Command \"%s\" is unknown, try \"ip mroute help\".\n", *argv);
+ exit(-1);
+}
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