Blame bridge/mdb.c

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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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 * Get mdb table with netlink
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <linux/if_bridge.h>
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#include <linux/if_ether.h>
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#include <string.h>
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#include <arpa/inet.h>
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#include "libnetlink.h"
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#include "br_common.h"
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#include "rt_names.h"
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#include "utils.h"
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#include "json_print.h"
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#ifndef MDBA_RTA
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#define MDBA_RTA(r) \
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	((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct br_port_msg))))
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#endif
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static unsigned int filter_index, filter_vlan;
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static void usage(void)
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{
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	fprintf(stderr,
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		"Usage: bridge mdb { add | del } dev DEV port PORT grp GROUP [permanent | temp] [vid VID]\n"
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		"       bridge mdb {show} [ dev DEV ] [ vid VID ]\n");
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	exit(-1);
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}
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static bool is_temp_mcast_rtr(__u8 type)
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{
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	return type == MDB_RTR_TYPE_TEMP_QUERY || type == MDB_RTR_TYPE_TEMP;
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}
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static const char *format_timer(__u32 ticks)
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{
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	struct timeval tv;
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	static char tbuf[32];
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	__jiffies_to_tv(&tv, ticks);
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	snprintf(tbuf, sizeof(tbuf), "%4lu.%.2lu",
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		 (unsigned long)tv.tv_sec,
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		 (unsigned long)tv.tv_usec / 10000);
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	return tbuf;
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}
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static void __print_router_port_stats(FILE *f, struct rtattr *pattr)
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{
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	struct rtattr *tb[MDBA_ROUTER_PATTR_MAX + 1];
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	parse_rtattr(tb, MDBA_ROUTER_PATTR_MAX, MDB_RTR_RTA(RTA_DATA(pattr)),
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		     RTA_PAYLOAD(pattr) - RTA_ALIGN(sizeof(uint32_t)));
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	if (tb[MDBA_ROUTER_PATTR_TIMER]) {
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		__u32 timer = rta_getattr_u32(tb[MDBA_ROUTER_PATTR_TIMER]);
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		print_string(PRINT_ANY, "timer", " %s",
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			     format_timer(timer));
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	}
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	if (tb[MDBA_ROUTER_PATTR_TYPE]) {
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		__u8 type = rta_getattr_u8(tb[MDBA_ROUTER_PATTR_TYPE]);
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		print_string(PRINT_ANY, "type", " %s",
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			     is_temp_mcast_rtr(type) ? "temp" : "permanent");
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	}
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}
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static void br_print_router_ports(FILE *f, struct rtattr *attr,
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				  const char *brifname)
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{
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	int rem = RTA_PAYLOAD(attr);
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	struct rtattr *i;
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	if (is_json_context())
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		open_json_array(PRINT_JSON, brifname);
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	else if (!show_stats)
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		fprintf(f, "router ports on %s: ", brifname);
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	for (i = RTA_DATA(attr); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
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		uint32_t *port_ifindex = RTA_DATA(i);
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		const char *port_ifname = ll_index_to_name(*port_ifindex);
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		if (is_json_context()) {
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			open_json_object(NULL);
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			print_string(PRINT_JSON, "port", NULL, port_ifname);
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			if (show_stats)
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				__print_router_port_stats(f, i);
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			close_json_object();
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		} else if (show_stats) {
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			fprintf(f, "router ports on %s: %s",
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				brifname, port_ifname);
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			__print_router_port_stats(f, i);
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			fprintf(f, "\n");
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		} else {
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			fprintf(f, "%s ", port_ifname);
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		}
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	}
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	if (!show_stats)
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		print_nl();
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	close_json_array(PRINT_JSON, NULL);
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}
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static void print_mdb_entry(FILE *f, int ifindex, const struct br_mdb_entry *e,
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			    struct nlmsghdr *n, struct rtattr **tb)
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{
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	SPRINT_BUF(abuf);
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	const char *dev;
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	const void *src;
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	int af;
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	if (filter_vlan && e->vid != filter_vlan)
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		return;
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	af = e->addr.proto == htons(ETH_P_IP) ? AF_INET : AF_INET6;
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	src = af == AF_INET ? (const void *)&e->addr.u.ip4 :
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			      (const void *)&e->addr.u.ip6;
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	dev = ll_index_to_name(ifindex);
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	open_json_object(NULL);
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	print_int(PRINT_JSON, "index", NULL, ifindex);
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	print_color_string(PRINT_ANY, COLOR_IFNAME, "dev", "dev %s", dev);
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	print_string(PRINT_ANY, "port", " port %s",
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		     ll_index_to_name(e->ifindex));
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	print_color_string(PRINT_ANY, ifa_family_color(af),
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			    "grp", " grp %s",
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			    inet_ntop(af, src, abuf, sizeof(abuf)));
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	print_string(PRINT_ANY, "state", " %s",
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			   (e->state & MDB_PERMANENT) ? "permanent" : "temp");
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	open_json_array(PRINT_JSON, "flags");
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	if (e->flags & MDB_FLAGS_OFFLOAD)
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		print_string(PRINT_ANY, NULL, " %s", "offload");
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	close_json_array(PRINT_JSON, NULL);
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	if (e->vid)
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		print_uint(PRINT_ANY, "vid", " vid %u", e->vid);
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	if (show_stats && tb && tb[MDBA_MDB_EATTR_TIMER]) {
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		__u32 timer = rta_getattr_u32(tb[MDBA_MDB_EATTR_TIMER]);
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		print_string(PRINT_ANY, "timer", " %s",
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			     format_timer(timer));
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	}
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	print_nl();
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	close_json_object();
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}
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static void br_print_mdb_entry(FILE *f, int ifindex, struct rtattr *attr,
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			       struct nlmsghdr *n)
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{
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	struct rtattr *etb[MDBA_MDB_EATTR_MAX + 1];
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	struct br_mdb_entry *e;
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	struct rtattr *i;
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	int rem;
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	rem = RTA_PAYLOAD(attr);
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	for (i = RTA_DATA(attr); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
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		e = RTA_DATA(i);
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		parse_rtattr(etb, MDBA_MDB_EATTR_MAX, MDB_RTA(RTA_DATA(i)),
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			     RTA_PAYLOAD(i) - RTA_ALIGN(sizeof(*e)));
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		print_mdb_entry(f, ifindex, e, n, etb);
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	}
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}
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static void print_mdb_entries(FILE *fp, struct nlmsghdr *n,
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			      int ifindex,  struct rtattr *mdb)
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{
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	int rem = RTA_PAYLOAD(mdb);
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	struct rtattr *i;
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	for (i = RTA_DATA(mdb); RTA_OK(i, rem); i = RTA_NEXT(i, rem))
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		br_print_mdb_entry(fp, ifindex, i, n);
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}
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static void print_router_entries(FILE *fp, struct nlmsghdr *n,
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				 int ifindex, struct rtattr *router)
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{
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	const char *brifname = ll_index_to_name(ifindex);
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	if (n->nlmsg_type == RTM_GETMDB) {
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		if (show_details)
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			br_print_router_ports(fp, router, brifname);
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	} else {
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		struct rtattr *i = RTA_DATA(router);
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		uint32_t *port_ifindex = RTA_DATA(i);
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		const char *port_name = ll_index_to_name(*port_ifindex);
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		if (is_json_context()) {
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			open_json_array(PRINT_JSON, brifname);
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			open_json_object(NULL);
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			print_string(PRINT_JSON, "port", NULL,
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				     port_name);
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			close_json_object();
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			close_json_array(PRINT_JSON, NULL);
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		} else {
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			fprintf(fp, "router port dev %s master %s\n",
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				port_name, brifname);
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		}
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	}
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}
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static int __parse_mdb_nlmsg(struct nlmsghdr *n, struct rtattr **tb)
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{
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	struct br_port_msg *r = NLMSG_DATA(n);
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	int len = n->nlmsg_len;
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	if (n->nlmsg_type != RTM_GETMDB &&
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	    n->nlmsg_type != RTM_NEWMDB &&
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	    n->nlmsg_type != RTM_DELMDB) {
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		fprintf(stderr,
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			"Not RTM_GETMDB, RTM_NEWMDB or RTM_DELMDB: %08x %08x %08x\n",
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			n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
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		return 0;
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	}
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	len -= NLMSG_LENGTH(sizeof(*r));
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	if (len < 0) {
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		fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
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		return -1;
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	}
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	if (filter_index && filter_index != r->ifindex)
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		return 0;
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	parse_rtattr(tb, MDBA_MAX, MDBA_RTA(r), n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
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	return 1;
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}
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static int print_mdbs(struct nlmsghdr *n, void *arg)
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{
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	struct br_port_msg *r = NLMSG_DATA(n);
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	struct rtattr *tb[MDBA_MAX+1];
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	FILE *fp = arg;
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	int ret;
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	ret = __parse_mdb_nlmsg(n, tb);
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	if (ret != 1)
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		return ret;
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	if (tb[MDBA_MDB])
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		print_mdb_entries(fp, n, r->ifindex, tb[MDBA_MDB]);
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	return 0;
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}
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static int print_rtrs(struct nlmsghdr *n, void *arg)
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{
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	struct br_port_msg *r = NLMSG_DATA(n);
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	struct rtattr *tb[MDBA_MAX+1];
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	FILE *fp = arg;
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	int ret;
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	ret = __parse_mdb_nlmsg(n, tb);
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	if (ret != 1)
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		return ret;
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	if (tb[MDBA_ROUTER])
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		print_router_entries(fp, n, r->ifindex, tb[MDBA_ROUTER]);
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	return 0;
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}
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int print_mdb_mon(struct nlmsghdr *n, void *arg)
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{
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	struct br_port_msg *r = NLMSG_DATA(n);
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	struct rtattr *tb[MDBA_MAX+1];
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	FILE *fp = arg;
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	int ret;
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	ret = __parse_mdb_nlmsg(n, tb);
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	if (ret != 1)
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		return ret;
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	if (n->nlmsg_type == RTM_DELMDB)
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		print_bool(PRINT_ANY, "deleted", "Deleted ", true);
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	if (tb[MDBA_MDB])
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		print_mdb_entries(fp, n, r->ifindex, tb[MDBA_MDB]);
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	if (tb[MDBA_ROUTER])
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		print_router_entries(fp, n, r->ifindex, tb[MDBA_ROUTER]);
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	return 0;
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}
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static int mdb_show(int argc, char **argv)
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{
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	char *filter_dev = NULL;
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	while (argc > 0) {
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		if (strcmp(*argv, "dev") == 0) {
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			NEXT_ARG();
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			if (filter_dev)
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				duparg("dev", *argv);
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			filter_dev = *argv;
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		} else if (strcmp(*argv, "vid") == 0) {
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			NEXT_ARG();
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			if (filter_vlan)
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				duparg("vid", *argv);
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			filter_vlan = atoi(*argv);
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		}
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		argc--; argv++;
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	}
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	if (filter_dev) {
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		filter_index = ll_name_to_index(filter_dev);
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		if (!filter_index)
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			return nodev(filter_dev);
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	}
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	new_json_obj(json);
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	open_json_object(NULL);
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	/* get mdb entries */
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	if (rtnl_mdbdump_req(&rth, PF_BRIDGE) < 0) {
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		perror("Cannot send dump request");
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		return -1;
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	}
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	open_json_array(PRINT_JSON, "mdb");
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	if (rtnl_dump_filter(&rth, print_mdbs, stdout) < 0) {
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		fprintf(stderr, "Dump terminated\n");
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		return -1;
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	}
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	close_json_array(PRINT_JSON, NULL);
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	/* get router ports */
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	if (rtnl_mdbdump_req(&rth, PF_BRIDGE) < 0) {
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		perror("Cannot send dump request");
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		return -1;
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	}
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	open_json_object("router");
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	if (rtnl_dump_filter(&rth, print_rtrs, stdout) < 0) {
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		fprintf(stderr, "Dump terminated\n");
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		return -1;
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	}
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	close_json_object();
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	close_json_object();
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	delete_json_obj();
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	fflush(stdout);
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	return 0;
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}
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static int mdb_modify(int cmd, int flags, int argc, char **argv)
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{
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	struct {
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		struct nlmsghdr	n;
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		struct br_port_msg	bpm;
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		char			buf[1024];
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	} req = {
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		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct br_port_msg)),
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		.n.nlmsg_flags = NLM_F_REQUEST | flags,
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		.n.nlmsg_type = cmd,
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		.bpm.family = PF_BRIDGE,
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	};
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	struct br_mdb_entry entry = {};
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	char *d = NULL, *p = NULL, *grp = NULL;
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	short vid = 0;
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	while (argc > 0) {
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		if (strcmp(*argv, "dev") == 0) {
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			NEXT_ARG();
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			d = *argv;
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		} else if (strcmp(*argv, "grp") == 0) {
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			NEXT_ARG();
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			grp = *argv;
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		} else if (strcmp(*argv, "port") == 0) {
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			NEXT_ARG();
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			p = *argv;
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		} else if (strcmp(*argv, "permanent") == 0) {
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			if (cmd == RTM_NEWMDB)
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				entry.state |= MDB_PERMANENT;
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		} else if (strcmp(*argv, "temp") == 0) {
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			;/* nothing */
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		} else if (strcmp(*argv, "vid") == 0) {
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			NEXT_ARG();
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			vid = atoi(*argv);
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		} else {
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			if (matches(*argv, "help") == 0)
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				usage();
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		}
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		argc--; argv++;
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	}
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	if (d == NULL || grp == NULL || p == NULL) {
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		fprintf(stderr, "Device, group address and port name are required arguments.\n");
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		return -1;
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	}
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	req.bpm.ifindex = ll_name_to_index(d);
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	if (!req.bpm.ifindex)
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		return nodev(d);
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	entry.ifindex = ll_name_to_index(p);
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	if (!entry.ifindex)
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		return nodev(p);
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	if (!inet_pton(AF_INET, grp, &entry.addr.u.ip4)) {
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		if (!inet_pton(AF_INET6, grp, &entry.addr.u.ip6)) {
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			fprintf(stderr, "Invalid address \"%s\"\n", grp);
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			return -1;
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		} else
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			entry.addr.proto = htons(ETH_P_IPV6);
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	} else
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		entry.addr.proto = htons(ETH_P_IP);
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	entry.vid = vid;
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	addattr_l(&req.n, sizeof(req), MDBA_SET_ENTRY, &entry, sizeof(entry));
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	if (rtnl_talk(&rth, &req.n, NULL) < 0)
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		return -1;
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	return 0;
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}
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int do_mdb(int argc, char **argv)
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{
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	ll_init_map(&rth);
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	if (argc > 0) {
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		if (matches(*argv, "add") == 0)
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			return mdb_modify(RTM_NEWMDB, NLM_F_CREATE|NLM_F_EXCL, argc-1, argv+1);
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		if (matches(*argv, "delete") == 0)
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			return mdb_modify(RTM_DELMDB, 0, argc-1, argv+1);
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		if (matches(*argv, "show") == 0 ||
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		    matches(*argv, "lst") == 0 ||
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		    matches(*argv, "list") == 0)
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			return mdb_show(argc-1, argv+1);
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		if (matches(*argv, "help") == 0)
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			usage();
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	} else
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		return mdb_show(0, NULL);
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	fprintf(stderr, "Command \"%s\" is unknown, try \"bridge mdb help\".\n", *argv);
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	exit(-1);
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}