Adding upstream version 6.1.0.upstream/6.1.0upstream

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

1 files changed, 841 insertions, 0 deletions

diff --git a/bridge/fdb.c b/bridge/fdb.c
new file mode 100644
index 0000000..775feb1
--- /dev/null
+++ b/bridge/fdb.c
@@ -0,0 +1,841 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Get/set/delete fdb table with netlink
+ *
+ * TODO: merge/replace this with ip neighbour
+ *
+ * Authors:	Stephen Hemminger <shemminger@vyatta.com>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <netdb.h>
+#include <time.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <net/if.h>
+#include <netinet/in.h>
+#include <linux/if_bridge.h>
+#include <linux/if_ether.h>
+#include <linux/neighbour.h>
+#include <string.h>
+#include <limits.h>
+#include <stdbool.h>
+
+#include "json_print.h"
+#include "libnetlink.h"
+#include "br_common.h"
+#include "rt_names.h"
+#include "utils.h"
+
+static unsigned int filter_index, filter_dynamic, filter_master,
+	filter_state, filter_vlan;
+
+static void usage(void)
+{
+	fprintf(stderr,
+		"Usage: bridge fdb { add | append | del | replace } ADDR dev DEV\n"
+		"              [ self ] [ master ] [ use ] [ router ] [ extern_learn ]\n"
+		"              [ sticky ] [ local | static | dynamic ] [ vlan VID ]\n"
+		"              { [ dst IPADDR ] [ port PORT] [ vni VNI ] | [ nhid NHID ] }\n"
+		"	       [ via DEV ] [ src_vni VNI ]\n"
+		"       bridge fdb [ show [ br BRDEV ] [ brport DEV ] [ vlan VID ]\n"
+		"              [ state STATE ] [ dynamic ] ]\n"
+		"       bridge fdb get [ to ] LLADDR [ br BRDEV ] { brport | dev } DEV\n"
+		"              [ vlan VID ] [ vni VNI ] [ self ] [ master ] [ dynamic ]\n"
+		"       bridge fdb flush dev DEV [ brport DEV ] [ vlan VID ]\n"
+		"              [ self ] [ master ] [ [no]permanent | [no]static | [no]dynamic ]\n"
+		"              [ [no]added_by_user ] [ [no]extern_learn ] [ [no]sticky ]\n"
+		"              [ [no]offloaded ]\n");
+	exit(-1);
+}
+
+static const char *state_n2a(unsigned int s)
+{
+	static char buf[32];
+
+	if (s & NUD_PERMANENT)
+		return "permanent";
+
+	if (s & NUD_NOARP)
+		return "static";
+
+	if (s & NUD_STALE)
+		return "stale";
+
+	if (s & NUD_REACHABLE)
+		return "";
+
+	if (is_json_context())
+		sprintf(buf, "%#x", s);
+	else
+		sprintf(buf, "state=%#x", s);
+	return buf;
+}
+
+static int state_a2n(unsigned int *s, const char *arg)
+{
+	if (matches(arg, "permanent") == 0)
+		*s = NUD_PERMANENT;
+	else if (matches(arg, "static") == 0 || matches(arg, "temp") == 0)
+		*s = NUD_NOARP;
+	else if (matches(arg, "stale") == 0)
+		*s = NUD_STALE;
+	else if (matches(arg, "reachable") == 0 || matches(arg, "dynamic") == 0)
+		*s = NUD_REACHABLE;
+	else if (strcmp(arg, "all") == 0)
+		*s = ~0;
+	else if (get_unsigned(s, arg, 0))
+		return -1;
+
+	return 0;
+}
+
+static void fdb_print_flags(FILE *fp, unsigned int flags)
+{
+	open_json_array(PRINT_JSON,
+			is_json_context() ?  "flags" : "");
+
+	if (flags & NTF_SELF)
+		print_string(PRINT_ANY, NULL, "%s ", "self");
+
+	if (flags & NTF_ROUTER)
+		print_string(PRINT_ANY, NULL, "%s ", "router");
+
+	if (flags & NTF_EXT_LEARNED)
+		print_string(PRINT_ANY, NULL, "%s ", "extern_learn");
+
+	if (flags & NTF_OFFLOADED)
+		print_string(PRINT_ANY, NULL, "%s ", "offload");
+
+	if (flags & NTF_MASTER)
+		print_string(PRINT_ANY, NULL, "%s ", "master");
+
+	if (flags & NTF_STICKY)
+		print_string(PRINT_ANY, NULL, "%s ", "sticky");
+
+	close_json_array(PRINT_JSON, NULL);
+}
+
+static void fdb_print_stats(FILE *fp, const struct nda_cacheinfo *ci)
+{
+	static int hz;
+
+	if (!hz)
+		hz = get_user_hz();
+
+	if (is_json_context()) {
+		print_uint(PRINT_JSON, "used", NULL,
+				 ci->ndm_used / hz);
+		print_uint(PRINT_JSON, "updated", NULL,
+				ci->ndm_updated / hz);
+	} else {
+		fprintf(fp, "used %d/%d ", ci->ndm_used / hz,
+					ci->ndm_updated / hz);
+
+	}
+}
+
+int print_fdb(struct nlmsghdr *n, void *arg)
+{
+	FILE *fp = arg;
+	struct ndmsg *r = NLMSG_DATA(n);
+	int len = n->nlmsg_len;
+	struct rtattr *tb[NDA_MAX+1];
+	__u16 vid = 0;
+
+	if (n->nlmsg_type != RTM_NEWNEIGH && n->nlmsg_type != RTM_DELNEIGH) {
+		fprintf(stderr, "Not RTM_NEWNEIGH: %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->ndm_family != AF_BRIDGE)
+		return 0;
+
+	if (filter_index && filter_index != r->ndm_ifindex)
+		return 0;
+
+	if (filter_state && !(r->ndm_state & filter_state))
+		return 0;
+
+	parse_rtattr(tb, NDA_MAX, NDA_RTA(r),
+		     n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
+
+	if (tb[NDA_VLAN])
+		vid = rta_getattr_u16(tb[NDA_VLAN]);
+
+	if (filter_vlan && filter_vlan != vid)
+		return 0;
+
+	if (filter_dynamic && (r->ndm_state & NUD_PERMANENT))
+		return 0;
+
+	print_headers(fp, "[NEIGH]");
+
+	open_json_object(NULL);
+	if (n->nlmsg_type == RTM_DELNEIGH)
+		print_bool(PRINT_ANY, "deleted", "Deleted ", true);
+
+	if (tb[NDA_LLADDR]) {
+		const char *lladdr;
+		SPRINT_BUF(b1);
+
+		lladdr = ll_addr_n2a(RTA_DATA(tb[NDA_LLADDR]),
+				     RTA_PAYLOAD(tb[NDA_LLADDR]),
+				     ll_index_to_type(r->ndm_ifindex),
+				     b1, sizeof(b1));
+
+		print_color_string(PRINT_ANY, COLOR_MAC,
+				   "mac", "%s ", lladdr);
+	}
+
+	if (!filter_index && r->ndm_ifindex) {
+		print_string(PRINT_FP, NULL, "dev ", NULL);
+
+		print_color_string(PRINT_ANY, COLOR_IFNAME,
+				   "ifname", "%s ",
+				   ll_index_to_name(r->ndm_ifindex));
+	}
+
+	if (tb[NDA_DST]) {
+		int family = AF_INET;
+		const char *dst;
+
+		if (RTA_PAYLOAD(tb[NDA_DST]) == sizeof(struct in6_addr))
+			family = AF_INET6;
+
+		dst = format_host(family,
+				  RTA_PAYLOAD(tb[NDA_DST]),
+				  RTA_DATA(tb[NDA_DST]));
+
+		print_string(PRINT_FP, NULL, "dst ", NULL);
+
+		print_color_string(PRINT_ANY,
+				   ifa_family_color(family),
+				   "dst", "%s ", dst);
+	}
+
+	if (vid)
+		print_uint(PRINT_ANY,
+				 "vlan", "vlan %hu ", vid);
+
+	if (tb[NDA_PORT])
+		print_uint(PRINT_ANY,
+				 "port", "port %u ",
+				 rta_getattr_be16(tb[NDA_PORT]));
+
+	if (tb[NDA_VNI])
+		print_uint(PRINT_ANY,
+				 "vni", "vni %u ",
+				 rta_getattr_u32(tb[NDA_VNI]));
+
+	if (tb[NDA_SRC_VNI])
+		print_uint(PRINT_ANY,
+				 "src_vni", "src_vni %u ",
+				rta_getattr_u32(tb[NDA_SRC_VNI]));
+
+	if (tb[NDA_IFINDEX]) {
+		unsigned int ifindex = rta_getattr_u32(tb[NDA_IFINDEX]);
+
+		if (tb[NDA_LINK_NETNSID])
+			print_uint(PRINT_ANY,
+					 "viaIfIndex", "via ifindex %u ",
+					 ifindex);
+		else
+			print_string(PRINT_ANY,
+					   "viaIf", "via %s ",
+					   ll_index_to_name(ifindex));
+	}
+
+	if (tb[NDA_NH_ID])
+		print_uint(PRINT_ANY, "nhid", "nhid %u ",
+			   rta_getattr_u32(tb[NDA_NH_ID]));
+
+	if (tb[NDA_LINK_NETNSID])
+		print_uint(PRINT_ANY,
+				 "linkNetNsId", "link-netnsid %d ",
+				 rta_getattr_u32(tb[NDA_LINK_NETNSID]));
+
+	if (show_stats && tb[NDA_CACHEINFO])
+		fdb_print_stats(fp, RTA_DATA(tb[NDA_CACHEINFO]));
+
+	fdb_print_flags(fp, r->ndm_flags);
+
+
+	if (tb[NDA_MASTER])
+		print_string(PRINT_ANY, "master", "master %s ",
+			     ll_index_to_name(rta_getattr_u32(tb[NDA_MASTER])));
+
+	print_string(PRINT_ANY, "state", "%s\n",
+			   state_n2a(r->ndm_state));
+	close_json_object();
+	fflush(fp);
+	return 0;
+}
+
+static int fdb_linkdump_filter(struct nlmsghdr *nlh, int reqlen)
+{
+	int err;
+
+	if (filter_index) {
+		struct ifinfomsg *ifm = NLMSG_DATA(nlh);
+
+		ifm->ifi_index = filter_index;
+	}
+
+	if (filter_master) {
+		err = addattr32(nlh, reqlen, IFLA_MASTER, filter_master);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int fdb_dump_filter(struct nlmsghdr *nlh, int reqlen)
+{
+	int err;
+
+	if (filter_index) {
+		struct ndmsg *ndm = NLMSG_DATA(nlh);
+
+		ndm->ndm_ifindex = filter_index;
+	}
+
+	if (filter_master) {
+		err = addattr32(nlh, reqlen, NDA_MASTER, filter_master);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int fdb_show(int argc, char **argv)
+{
+	char *filter_dev = NULL;
+	char *br = NULL;
+	int rc;
+
+	while (argc > 0) {
+		if ((strcmp(*argv, "brport") == 0) || strcmp(*argv, "dev") == 0) {
+			NEXT_ARG();
+			filter_dev = *argv;
+		} else if (strcmp(*argv, "br") == 0) {
+			NEXT_ARG();
+			br = *argv;
+		} else if (strcmp(*argv, "vlan") == 0) {
+			NEXT_ARG();
+			if (filter_vlan)
+				duparg("vlan", *argv);
+			filter_vlan = atoi(*argv);
+		} else if (strcmp(*argv, "state") == 0) {
+			unsigned int state;
+
+			NEXT_ARG();
+			if (state_a2n(&state, *argv))
+				invarg("invalid state", *argv);
+			filter_state |= state;
+		} else if (strcmp(*argv, "dynamic") == 0) {
+			filter_dynamic = 1;
+		} else {
+			if (matches(*argv, "help") == 0)
+				usage();
+		}
+		argc--; argv++;
+	}
+
+	if (br) {
+		int br_ifindex = ll_name_to_index(br);
+
+		if (br_ifindex == 0) {
+			fprintf(stderr, "Cannot find bridge device \"%s\"\n", br);
+			return -1;
+		}
+		filter_master = br_ifindex;
+	}
+
+	/*we'll keep around filter_dev for older kernels */
+	if (filter_dev) {
+		filter_index = ll_name_to_index(filter_dev);
+		if (!filter_index)
+			return nodev(filter_dev);
+	}
+
+	if (rth.flags & RTNL_HANDLE_F_STRICT_CHK)
+		rc = rtnl_neighdump_req(&rth, PF_BRIDGE, fdb_dump_filter);
+	else
+		rc = rtnl_fdb_linkdump_req_filter_fn(&rth, fdb_linkdump_filter);
+	if (rc < 0) {
+		perror("Cannot send dump request");
+		exit(1);
+	}
+
+	new_json_obj(json);
+	if (rtnl_dump_filter(&rth, print_fdb, stdout) < 0) {
+		fprintf(stderr, "Dump terminated\n");
+		exit(1);
+	}
+	delete_json_obj();
+	fflush(stdout);
+
+	return 0;
+}
+
+static int fdb_modify(int cmd, int flags, int argc, char **argv)
+{
+	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 | flags,
+		.n.nlmsg_type = cmd,
+		.ndm.ndm_family = PF_BRIDGE,
+		.ndm.ndm_state = NUD_NOARP,
+	};
+	char *addr = NULL;
+	char *d = NULL;
+	char abuf[ETH_ALEN];
+	int dst_ok = 0;
+	inet_prefix dst;
+	unsigned long port = 0;
+	unsigned long vni = ~0;
+	unsigned long src_vni = ~0;
+	unsigned int via = 0;
+	char *endptr;
+	short vid = -1;
+	__u32 nhid = 0;
+
+	while (argc > 0) {
+		if (strcmp(*argv, "dev") == 0) {
+			NEXT_ARG();
+			d = *argv;
+		} else if (strcmp(*argv, "dst") == 0) {
+			NEXT_ARG();
+			if (dst_ok)
+				duparg2("dst", *argv);
+			get_addr(&dst, *argv, preferred_family);
+			dst_ok = 1;
+		} else if (strcmp(*argv, "nhid") == 0) {
+			NEXT_ARG();
+			if (get_u32(&nhid, *argv, 0))
+				invarg("\"id\" value is invalid\n", *argv);
+		} else if (strcmp(*argv, "port") == 0) {
+
+			NEXT_ARG();
+			port = strtoul(*argv, &endptr, 0);
+			if (endptr && *endptr) {
+				struct servent *pse;
+
+				pse = getservbyname(*argv, "udp");
+				if (!pse)
+					invarg("invalid port\n", *argv);
+				port = ntohs(pse->s_port);
+			} else if (port > 0xffff)
+				invarg("invalid port\n", *argv);
+		} else if (strcmp(*argv, "vni") == 0) {
+			NEXT_ARG();
+			vni = strtoul(*argv, &endptr, 0);
+			if ((endptr && *endptr) ||
+			    (vni >> 24) || vni == ULONG_MAX)
+				invarg("invalid VNI\n", *argv);
+		} else if (strcmp(*argv, "src_vni") == 0) {
+			NEXT_ARG();
+			src_vni = strtoul(*argv, &endptr, 0);
+			if ((endptr && *endptr) ||
+			    (src_vni >> 24) || src_vni == ULONG_MAX)
+				invarg("invalid src VNI\n", *argv);
+		} else if (strcmp(*argv, "via") == 0) {
+			NEXT_ARG();
+			via = ll_name_to_index(*argv);
+			if (!via)
+				exit(nodev(*argv));
+		} else if (strcmp(*argv, "self") == 0) {
+			req.ndm.ndm_flags |= NTF_SELF;
+		} else if (matches(*argv, "master") == 0) {
+			req.ndm.ndm_flags |= NTF_MASTER;
+		} else if (matches(*argv, "router") == 0) {
+			req.ndm.ndm_flags |= NTF_ROUTER;
+		} else if (matches(*argv, "local") == 0 ||
+			   matches(*argv, "permanent") == 0) {
+			req.ndm.ndm_state |= NUD_PERMANENT;
+		} else if (matches(*argv, "temp") == 0 ||
+			   matches(*argv, "static") == 0) {
+			req.ndm.ndm_state |= NUD_REACHABLE;
+		} else if (matches(*argv, "dynamic") == 0) {
+			req.ndm.ndm_state |= NUD_REACHABLE;
+			req.ndm.ndm_state &= ~NUD_NOARP;
+		} else if (matches(*argv, "vlan") == 0) {
+			if (vid >= 0)
+				duparg2("vlan", *argv);
+			NEXT_ARG();
+			vid = atoi(*argv);
+		} else if (matches(*argv, "use") == 0) {
+			req.ndm.ndm_flags |= NTF_USE;
+		} else if (matches(*argv, "extern_learn") == 0) {
+			req.ndm.ndm_flags |= NTF_EXT_LEARNED;
+		} else if (matches(*argv, "sticky") == 0) {
+			req.ndm.ndm_flags |= NTF_STICKY;
+		} else {
+			if (strcmp(*argv, "to") == 0)
+				NEXT_ARG();
+
+			if (matches(*argv, "help") == 0)
+				usage();
+			if (addr)
+				duparg2("to", *argv);
+			addr = *argv;
+		}
+		argc--; argv++;
+	}
+
+	if (d == NULL || addr == NULL) {
+		fprintf(stderr, "Device and address are required arguments.\n");
+		return -1;
+	}
+
+	if (nhid && (dst_ok || port || vni != ~0)) {
+		fprintf(stderr, "dst, port, vni are mutually exclusive with nhid\n");
+		return -1;
+	}
+
+	/* Assume self */
+	if (!(req.ndm.ndm_flags&(NTF_SELF|NTF_MASTER)))
+		req.ndm.ndm_flags |= NTF_SELF;
+
+	/* Assume permanent */
+	if (!(req.ndm.ndm_state&(NUD_PERMANENT|NUD_REACHABLE)))
+		req.ndm.ndm_state |= NUD_PERMANENT;
+
+	if (sscanf(addr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
+		   abuf, abuf+1, abuf+2,
+		   abuf+3, abuf+4, abuf+5) != 6) {
+		fprintf(stderr, "Invalid mac address %s\n", addr);
+		return -1;
+	}
+
+	addattr_l(&req.n, sizeof(req), NDA_LLADDR, abuf, ETH_ALEN);
+	if (dst_ok)
+		addattr_l(&req.n, sizeof(req), NDA_DST, &dst.data, dst.bytelen);
+
+	if (vid >= 0)
+		addattr16(&req.n, sizeof(req), NDA_VLAN, vid);
+	if (nhid > 0)
+		addattr32(&req.n, sizeof(req), NDA_NH_ID, nhid);
+
+	if (port) {
+		unsigned short dport;
+
+		dport = htons((unsigned short)port);
+		addattr16(&req.n, sizeof(req), NDA_PORT, dport);
+	}
+	if (vni != ~0)
+		addattr32(&req.n, sizeof(req), NDA_VNI, vni);
+	if (src_vni != ~0)
+		addattr32(&req.n, sizeof(req), NDA_SRC_VNI, src_vni);
+	if (via)
+		addattr32(&req.n, sizeof(req), NDA_IFINDEX, via);
+
+	req.ndm.ndm_ifindex = ll_name_to_index(d);
+	if (!req.ndm.ndm_ifindex)
+		return nodev(d);
+
+	if (rtnl_talk(&rth, &req.n, NULL) < 0)
+		return -1;
+
+	return 0;
+}
+
+static int fdb_get(int argc, char **argv)
+{
+	struct {
+		struct nlmsghdr	n;
+		struct ndmsg		ndm;
+		char			buf[1024];
+	} req = {
+		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
+		.n.nlmsg_flags = NLM_F_REQUEST,
+		.n.nlmsg_type = RTM_GETNEIGH,
+		.ndm.ndm_family = AF_BRIDGE,
+	};
+	char  *d = NULL, *br = NULL;
+	struct nlmsghdr *answer;
+	unsigned long vni = ~0;
+	char abuf[ETH_ALEN];
+	int br_ifindex = 0;
+	char *addr = NULL;
+	short vlan = -1;
+	char *endptr;
+	int ret;
+
+	while (argc > 0) {
+		if ((strcmp(*argv, "brport") == 0) || strcmp(*argv, "dev") == 0) {
+			NEXT_ARG();
+			d = *argv;
+		} else if (strcmp(*argv, "br") == 0) {
+			NEXT_ARG();
+			br = *argv;
+		} else if (strcmp(*argv, "dev") == 0) {
+			NEXT_ARG();
+			d = *argv;
+		} else if (strcmp(*argv, "vni") == 0) {
+			NEXT_ARG();
+			vni = strtoul(*argv, &endptr, 0);
+			if ((endptr && *endptr) ||
+			    (vni >> 24) || vni == ULONG_MAX)
+				invarg("invalid VNI\n", *argv);
+		} else if (strcmp(*argv, "self") == 0) {
+			req.ndm.ndm_flags |= NTF_SELF;
+		} else if (matches(*argv, "master") == 0) {
+			req.ndm.ndm_flags |= NTF_MASTER;
+		} else if (matches(*argv, "vlan") == 0) {
+			if (vlan >= 0)
+				duparg2("vlan", *argv);
+			NEXT_ARG();
+			vlan = atoi(*argv);
+		} else if (matches(*argv, "dynamic") == 0) {
+			filter_dynamic = 1;
+		} else {
+			if (strcmp(*argv, "to") == 0)
+				NEXT_ARG();
+
+			if (matches(*argv, "help") == 0)
+				usage();
+			if (addr)
+				duparg2("to", *argv);
+			addr = *argv;
+		}
+		argc--; argv++;
+	}
+
+	if ((d == NULL && br == NULL) || addr == NULL) {
+		fprintf(stderr, "Device or master and address are required arguments.\n");
+		return -1;
+	}
+
+	if (sscanf(addr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
+		   abuf, abuf+1, abuf+2,
+		   abuf+3, abuf+4, abuf+5) != 6) {
+		fprintf(stderr, "Invalid mac address %s\n", addr);
+		return -1;
+	}
+
+	addattr_l(&req.n, sizeof(req), NDA_LLADDR, abuf, ETH_ALEN);
+
+	if (vlan >= 0)
+		addattr16(&req.n, sizeof(req), NDA_VLAN, vlan);
+
+	if (vni != ~0)
+		addattr32(&req.n, sizeof(req), NDA_VNI, vni);
+
+	if (d) {
+		req.ndm.ndm_ifindex = ll_name_to_index(d);
+		if (!req.ndm.ndm_ifindex) {
+			fprintf(stderr, "Cannot find device \"%s\"\n", d);
+			return -1;
+		}
+	}
+
+	if (br) {
+		br_ifindex = ll_name_to_index(br);
+		if (!br_ifindex) {
+			fprintf(stderr, "Cannot find bridge device \"%s\"\n", br);
+			return -1;
+		}
+		addattr32(&req.n, sizeof(req), NDA_MASTER, br_ifindex);
+	}
+
+	if (rtnl_talk(&rth, &req.n, &answer) < 0)
+		return -2;
+
+	/*
+	 * Initialize a json_writer and open an array object
+	 * if -json was specified.
+	 */
+	new_json_obj(json);
+	ret = 0;
+	if (print_fdb(answer, stdout) < 0) {
+		fprintf(stderr, "An error :-)\n");
+		ret = -1;
+	}
+	delete_json_obj();
+	free(answer);
+
+	return ret;
+}
+
+static int fdb_flush(int argc, char **argv)
+{
+	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 | NLM_F_BULK,
+		.n.nlmsg_type = RTM_DELNEIGH,
+		.ndm.ndm_family = PF_BRIDGE,
+	};
+	unsigned short ndm_state_mask = 0;
+	unsigned short ndm_flags_mask = 0;
+	short vid = -1, port_ifidx = -1;
+	unsigned short ndm_flags = 0;
+	unsigned short ndm_state = 0;
+	char *d = NULL, *port = NULL;
+
+	while (argc > 0) {
+		if (strcmp(*argv, "dev") == 0) {
+			NEXT_ARG();
+			d = *argv;
+		} else if (strcmp(*argv, "master") == 0) {
+			ndm_flags |= NTF_MASTER;
+		} else if (strcmp(*argv, "self") == 0) {
+			ndm_flags |= NTF_SELF;
+		} else if (strcmp(*argv, "permanent") == 0) {
+			ndm_state |= NUD_PERMANENT;
+			ndm_state_mask |= NUD_PERMANENT;
+		} else if (strcmp(*argv, "nopermanent") == 0) {
+			ndm_state &= ~NUD_PERMANENT;
+			ndm_state_mask |= NUD_PERMANENT;
+		} else if (strcmp(*argv, "static") == 0) {
+			ndm_state |= NUD_NOARP;
+			ndm_state_mask |= NUD_NOARP | NUD_PERMANENT;
+		} else if (strcmp(*argv, "nostatic") == 0) {
+			ndm_state &= ~NUD_NOARP;
+			ndm_state_mask |= NUD_NOARP;
+		} else if (strcmp(*argv, "dynamic") == 0) {
+			ndm_state &= ~NUD_NOARP | NUD_PERMANENT;
+			ndm_state_mask |= NUD_NOARP | NUD_PERMANENT;
+		} else if (strcmp(*argv, "nodynamic") == 0) {
+			ndm_state |= NUD_NOARP;
+			ndm_state_mask |= NUD_NOARP;
+		} else if (strcmp(*argv, "added_by_user") == 0) {
+			ndm_flags |= NTF_USE;
+			ndm_flags_mask |= NTF_USE;
+		} else if (strcmp(*argv, "noadded_by_user") == 0) {
+			ndm_flags &= ~NTF_USE;
+			ndm_flags_mask |= NTF_USE;
+		} else if (strcmp(*argv, "extern_learn") == 0) {
+			ndm_flags |= NTF_EXT_LEARNED;
+			ndm_flags_mask |= NTF_EXT_LEARNED;
+		} else if (strcmp(*argv, "noextern_learn") == 0) {
+			ndm_flags &= ~NTF_EXT_LEARNED;
+			ndm_flags_mask |= NTF_EXT_LEARNED;
+		} else if (strcmp(*argv, "sticky") == 0) {
+			ndm_flags |= NTF_STICKY;
+			ndm_flags_mask |= NTF_STICKY;
+		} else if (strcmp(*argv, "nosticky") == 0) {
+			ndm_flags &= ~NTF_STICKY;
+			ndm_flags_mask |= NTF_STICKY;
+		} else if (strcmp(*argv, "offloaded") == 0) {
+			ndm_flags |= NTF_OFFLOADED;
+			ndm_flags_mask |= NTF_OFFLOADED;
+		} else if (strcmp(*argv, "nooffloaded") == 0) {
+			ndm_flags &= ~NTF_OFFLOADED;
+			ndm_flags_mask |= NTF_OFFLOADED;
+		} else if (strcmp(*argv, "brport") == 0) {
+			if (port)
+				duparg2("brport", *argv);
+			NEXT_ARG();
+			port = *argv;
+		} else if (strcmp(*argv, "vlan") == 0) {
+			if (vid >= 0)
+				duparg2("vlan", *argv);
+			NEXT_ARG();
+			vid = atoi(*argv);
+		} else {
+			if (strcmp(*argv, "help") == 0)
+				NEXT_ARG();
+		}
+		argc--; argv++;
+	}
+
+	if (d == NULL) {
+		fprintf(stderr, "Device is a required argument.\n");
+		return -1;
+	}
+
+	req.ndm.ndm_ifindex = ll_name_to_index(d);
+	if (req.ndm.ndm_ifindex == 0) {
+		fprintf(stderr, "Cannot find bridge device \"%s\"\n", d);
+		return -1;
+	}
+
+	if (port) {
+		port_ifidx = ll_name_to_index(port);
+		if (port_ifidx == 0) {
+			fprintf(stderr, "Cannot find bridge port device \"%s\"\n",
+				port);
+			return -1;
+		}
+	}
+
+	if (vid >= 4096) {
+		fprintf(stderr, "Invalid VLAN ID \"%hu\"\n", vid);
+		return -1;
+	}
+
+	/* if self and master were not specified assume self */
+	if (!(ndm_flags & (NTF_SELF | NTF_MASTER)))
+		ndm_flags |= NTF_SELF;
+
+	req.ndm.ndm_flags = ndm_flags;
+	req.ndm.ndm_state = ndm_state;
+	if (port_ifidx > -1)
+		addattr32(&req.n, sizeof(req), NDA_IFINDEX, port_ifidx);
+	if (vid > -1)
+		addattr16(&req.n, sizeof(req), NDA_VLAN, vid);
+	if (ndm_flags_mask)
+		addattr8(&req.n, sizeof(req), NDA_NDM_FLAGS_MASK,
+			 ndm_flags_mask);
+	if (ndm_state_mask)
+		addattr16(&req.n, sizeof(req), NDA_NDM_STATE_MASK,
+			  ndm_state_mask);
+
+	if (rtnl_talk(&rth, &req.n, NULL) < 0)
+		return -1;
+
+	return 0;
+}
+
+int do_fdb(int argc, char **argv)
+{
+	ll_init_map(&rth);
+	timestamp = 0;
+
+	if (argc > 0) {
+		if (matches(*argv, "add") == 0)
+			return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_EXCL, argc-1, argv+1);
+		if (matches(*argv, "append") == 0)
+			return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_APPEND, argc-1, argv+1);
+		if (matches(*argv, "replace") == 0)
+			return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
+		if (matches(*argv, "delete") == 0)
+			return fdb_modify(RTM_DELNEIGH, 0, argc-1, argv+1);
+		if (matches(*argv, "get") == 0)
+			return fdb_get(argc-1, argv+1);
+		if (matches(*argv, "show") == 0 ||
+		    matches(*argv, "lst") == 0 ||
+		    matches(*argv, "list") == 0)
+			return fdb_show(argc-1, argv+1);
+		if (strcmp(*argv, "flush") == 0)
+			return fdb_flush(argc-1, argv+1);
+		if (matches(*argv, "help") == 0)
+			usage();
+	} else
+		return fdb_show(0, NULL);
+
+	fprintf(stderr, "Command \"%s\" is unknown, try \"bridge fdb help\".\n", *argv);
+	exit(-1);
+}