Adding upstream version 6.1.0.upstream/6.1.0upstream

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

1 files changed, 610 insertions, 0 deletions

diff --git a/bridge/link.c b/bridge/link.c
new file mode 100644
index 0000000..fef3a9e
--- /dev/null
+++ b/bridge/link.c
@@ -0,0 +1,610 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <netinet/in.h>
+#include <linux/if.h>
+#include <linux/if_bridge.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include "json_print.h"
+#include "libnetlink.h"
+#include "utils.h"
+#include "br_common.h"
+
+static unsigned int filter_index;
+
+static const char *stp_states[] = {
+	[BR_STATE_DISABLED] = "disabled",
+	[BR_STATE_LISTENING] = "listening",
+	[BR_STATE_LEARNING] = "learning",
+	[BR_STATE_FORWARDING] = "forwarding",
+	[BR_STATE_BLOCKING] = "blocking",
+};
+
+static const char *hw_mode[] = {
+	"VEB", "VEPA"
+};
+
+static void print_link_flags(FILE *fp, unsigned int flags, unsigned int mdown)
+{
+	open_json_array(PRINT_ANY, is_json_context() ? "flags" : "<");
+	if (flags & IFF_UP && !(flags & IFF_RUNNING))
+		print_string(PRINT_ANY, NULL,
+			     flags ? "%s," : "%s", "NO-CARRIER");
+	flags &= ~IFF_RUNNING;
+
+#define _PF(f) if (flags&IFF_##f) {					\
+		flags &= ~IFF_##f ;					\
+		print_string(PRINT_ANY, NULL, flags ? "%s," : "%s", #f); }
+	_PF(LOOPBACK);
+	_PF(BROADCAST);
+	_PF(POINTOPOINT);
+	_PF(MULTICAST);
+	_PF(NOARP);
+	_PF(ALLMULTI);
+	_PF(PROMISC);
+	_PF(MASTER);
+	_PF(SLAVE);
+	_PF(DEBUG);
+	_PF(DYNAMIC);
+	_PF(AUTOMEDIA);
+	_PF(PORTSEL);
+	_PF(NOTRAILERS);
+	_PF(UP);
+	_PF(LOWER_UP);
+	_PF(DORMANT);
+	_PF(ECHO);
+#undef _PF
+	if (flags)
+		print_hex(PRINT_ANY, NULL, "%x", flags);
+	if (mdown)
+		print_string(PRINT_ANY, NULL, ",%s", "M-DOWN");
+	close_json_array(PRINT_ANY, "> ");
+}
+
+void print_stp_state(__u8 state)
+{
+	if (state <= BR_STATE_BLOCKING)
+		print_string(PRINT_ANY, "state",
+			     "state %s ", stp_states[state]);
+	else
+		print_uint(PRINT_ANY, "state",
+			     "state (%d) ", state);
+}
+
+int parse_stp_state(const char *arg)
+{
+	size_t nstates = ARRAY_SIZE(stp_states);
+	int state;
+
+	for (state = 0; state < nstates; state++)
+		if (strcmp(stp_states[state], arg) == 0)
+			break;
+
+	if (state == nstates)
+		state = -1;
+
+	return state;
+}
+
+static void print_hwmode(__u16 mode)
+{
+	if (mode >= ARRAY_SIZE(hw_mode))
+		print_0xhex(PRINT_ANY, "hwmode",
+			    "hwmode %#llx ", mode);
+	else
+		print_string(PRINT_ANY, "hwmode",
+			     "hwmode %s ", hw_mode[mode]);
+}
+
+static void print_protinfo(FILE *fp, struct rtattr *attr)
+{
+	if (attr->rta_type & NLA_F_NESTED) {
+		struct rtattr *prtb[IFLA_BRPORT_MAX + 1];
+
+		parse_rtattr_nested(prtb, IFLA_BRPORT_MAX, attr);
+
+		if (prtb[IFLA_BRPORT_STATE])
+			print_stp_state(rta_getattr_u8(prtb[IFLA_BRPORT_STATE]));
+
+		if (prtb[IFLA_BRPORT_PRIORITY])
+			print_uint(PRINT_ANY, "priority",
+				   "priority %u ",
+				   rta_getattr_u16(prtb[IFLA_BRPORT_PRIORITY]));
+
+		if (prtb[IFLA_BRPORT_COST])
+			print_uint(PRINT_ANY, "cost",
+				   "cost %u ",
+				   rta_getattr_u32(prtb[IFLA_BRPORT_COST]));
+
+		if (!show_details)
+			return;
+
+		if (!is_json_context())
+			fprintf(fp, "%s    ", _SL_);
+
+		if (prtb[IFLA_BRPORT_MODE])
+			print_on_off(PRINT_ANY, "hairpin", "hairpin %s ",
+				     rta_getattr_u8(prtb[IFLA_BRPORT_MODE]));
+		if (prtb[IFLA_BRPORT_GUARD])
+			print_on_off(PRINT_ANY, "guard", "guard %s ",
+				     rta_getattr_u8(prtb[IFLA_BRPORT_GUARD]));
+		if (prtb[IFLA_BRPORT_PROTECT])
+			print_on_off(PRINT_ANY, "root_block", "root_block %s ",
+				     rta_getattr_u8(prtb[IFLA_BRPORT_PROTECT]));
+		if (prtb[IFLA_BRPORT_FAST_LEAVE])
+			print_on_off(PRINT_ANY, "fastleave", "fastleave %s ",
+				     rta_getattr_u8(prtb[IFLA_BRPORT_FAST_LEAVE]));
+		if (prtb[IFLA_BRPORT_LEARNING])
+			print_on_off(PRINT_ANY, "learning", "learning %s ",
+				     rta_getattr_u8(prtb[IFLA_BRPORT_LEARNING]));
+		if (prtb[IFLA_BRPORT_LEARNING_SYNC])
+			print_on_off(PRINT_ANY, "learning_sync", "learning_sync %s ",
+				     rta_getattr_u8(prtb[IFLA_BRPORT_LEARNING_SYNC]));
+		if (prtb[IFLA_BRPORT_UNICAST_FLOOD])
+			print_on_off(PRINT_ANY, "flood", "flood %s ",
+				     rta_getattr_u8(prtb[IFLA_BRPORT_UNICAST_FLOOD]));
+		if (prtb[IFLA_BRPORT_MCAST_FLOOD])
+			print_on_off(PRINT_ANY, "mcast_flood", "mcast_flood %s ",
+				     rta_getattr_u8(prtb[IFLA_BRPORT_MCAST_FLOOD]));
+		if (prtb[IFLA_BRPORT_BCAST_FLOOD])
+			print_on_off(PRINT_ANY, "bcast_flood", "bcast_flood %s ",
+				     rta_getattr_u8(prtb[IFLA_BRPORT_BCAST_FLOOD]));
+		if (prtb[IFLA_BRPORT_MULTICAST_ROUTER])
+			print_uint(PRINT_ANY, "mcast_router", "mcast_router %u ",
+				   rta_getattr_u8(prtb[IFLA_BRPORT_MULTICAST_ROUTER]));
+		if (prtb[IFLA_BRPORT_MCAST_TO_UCAST])
+			print_on_off(PRINT_ANY, "mcast_to_unicast", "mcast_to_unicast %s ",
+				     rta_getattr_u8(prtb[IFLA_BRPORT_MCAST_TO_UCAST]));
+		if (prtb[IFLA_BRPORT_NEIGH_SUPPRESS])
+			print_on_off(PRINT_ANY, "neigh_suppress", "neigh_suppress %s ",
+				     rta_getattr_u8(prtb[IFLA_BRPORT_NEIGH_SUPPRESS]));
+		if (prtb[IFLA_BRPORT_VLAN_TUNNEL])
+			print_on_off(PRINT_ANY, "vlan_tunnel", "vlan_tunnel %s ",
+				     rta_getattr_u8(prtb[IFLA_BRPORT_VLAN_TUNNEL]));
+
+		if (prtb[IFLA_BRPORT_BACKUP_PORT]) {
+			int ifidx;
+
+			ifidx = rta_getattr_u32(prtb[IFLA_BRPORT_BACKUP_PORT]);
+			print_string(PRINT_ANY,
+				     "backup_port", "backup_port %s ",
+				     ll_index_to_name(ifidx));
+		}
+
+		if (prtb[IFLA_BRPORT_ISOLATED])
+			print_on_off(PRINT_ANY, "isolated", "isolated %s ",
+				     rta_getattr_u8(prtb[IFLA_BRPORT_ISOLATED]));
+		if (prtb[IFLA_BRPORT_LOCKED])
+			print_on_off(PRINT_ANY, "locked", "locked %s ",
+				     rta_getattr_u8(prtb[IFLA_BRPORT_LOCKED]));
+	} else
+		print_stp_state(rta_getattr_u8(attr));
+}
+
+
+/*
+ * This is reported by HW devices that have some bridging
+ * capabilities.
+ */
+static void print_af_spec(struct rtattr *attr, int ifindex)
+{
+	struct rtattr *aftb[IFLA_BRIDGE_MAX+1];
+
+	parse_rtattr_nested(aftb, IFLA_BRIDGE_MAX, attr);
+
+	if (aftb[IFLA_BRIDGE_MODE])
+		print_hwmode(rta_getattr_u16(aftb[IFLA_BRIDGE_MODE]));
+}
+
+int print_linkinfo(struct nlmsghdr *n, void *arg)
+{
+	FILE *fp = arg;
+	struct ifinfomsg *ifi = NLMSG_DATA(n);
+	struct rtattr *tb[IFLA_MAX+1];
+	unsigned int m_flag = 0;
+	int len = n->nlmsg_len;
+	const char *name;
+
+	len -= NLMSG_LENGTH(sizeof(*ifi));
+	if (len < 0) {
+		fprintf(stderr, "Message too short!\n");
+		return -1;
+	}
+
+	if (!(ifi->ifi_family == AF_BRIDGE || ifi->ifi_family == AF_UNSPEC))
+		return 0;
+
+	if (filter_index && filter_index != ifi->ifi_index)
+		return 0;
+
+	parse_rtattr_flags(tb, IFLA_MAX, IFLA_RTA(ifi), len, NLA_F_NESTED);
+
+	name = get_ifname_rta(ifi->ifi_index, tb[IFLA_IFNAME]);
+	if (!name)
+		return -1;
+
+	print_headers(fp, "[LINK]");
+
+	open_json_object(NULL);
+	if (n->nlmsg_type == RTM_DELLINK)
+		print_bool(PRINT_ANY, "deleted", "Deleted ", true);
+
+	print_int(PRINT_ANY, "ifindex", "%d: ", ifi->ifi_index);
+	m_flag = print_name_and_link("%s: ", name, tb);
+	print_link_flags(fp, ifi->ifi_flags, m_flag);
+
+	if (tb[IFLA_MTU])
+		print_int(PRINT_ANY,
+			  "mtu", "mtu %u ",
+			  rta_getattr_u32(tb[IFLA_MTU]));
+
+	if (tb[IFLA_MASTER]) {
+		int master = rta_getattr_u32(tb[IFLA_MASTER]);
+
+		print_string(PRINT_ANY, "master", "master %s ",
+			     ll_index_to_name(master));
+	}
+
+	if (tb[IFLA_PROTINFO])
+		print_protinfo(fp, tb[IFLA_PROTINFO]);
+
+	if (tb[IFLA_AF_SPEC])
+		print_af_spec(tb[IFLA_AF_SPEC], ifi->ifi_index);
+
+	print_string(PRINT_FP, NULL, "%s", "\n");
+	close_json_object();
+	fflush(fp);
+	return 0;
+}
+
+static void usage(void)
+{
+	fprintf(stderr,
+		"Usage: bridge link set dev DEV [ cost COST ] [ priority PRIO ] [ state STATE ]\n"
+		"                               [ guard {on | off} ]\n"
+		"                               [ hairpin {on | off} ]\n"
+		"                               [ fastleave {on | off} ]\n"
+		"                               [ root_block {on | off} ]\n"
+		"                               [ learning {on | off} ]\n"
+		"                               [ learning_sync {on | off} ]\n"
+		"                               [ flood {on | off} ]\n"
+		"                               [ mcast_router MULTICAST_ROUTER ]\n"
+		"                               [ mcast_flood {on | off} ]\n"
+		"                               [ bcast_flood {on | off} ]\n"
+		"                               [ mcast_to_unicast {on | off} ]\n"
+		"                               [ neigh_suppress {on | off} ]\n"
+		"                               [ vlan_tunnel {on | off} ]\n"
+		"                               [ isolated {on | off} ]\n"
+		"                               [ locked {on | off} ]\n"
+		"                               [ hwmode {vepa | veb} ]\n"
+		"                               [ backup_port DEVICE ] [ nobackup_port ]\n"
+		"                               [ self ] [ master ]\n"
+		"       bridge link show [dev DEV]\n");
+	exit(-1);
+}
+
+static int brlink_modify(int argc, char **argv)
+{
+	struct {
+		struct nlmsghdr  n;
+		struct ifinfomsg ifm;
+		char             buf[512];
+	} req = {
+		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+		.n.nlmsg_flags = NLM_F_REQUEST,
+		.n.nlmsg_type = RTM_SETLINK,
+		.ifm.ifi_family = PF_BRIDGE,
+	};
+	char *d = NULL;
+	int backup_port_idx = -1;
+	__s8 neigh_suppress = -1;
+	__s8 learning = -1;
+	__s8 learning_sync = -1;
+	__s8 flood = -1;
+	__s8 vlan_tunnel = -1;
+	__s8 mcast_router = -1;
+	__s8 mcast_flood = -1;
+	__s8 bcast_flood = -1;
+	__s8 mcast_to_unicast = -1;
+	__s8 locked = -1;
+	__s8 isolated = -1;
+	__s8 hairpin = -1;
+	__s8 bpdu_guard = -1;
+	__s8 fast_leave = -1;
+	__s8 root_block = -1;
+	__u32 cost = 0;
+	__s16 priority = -1;
+	__s8 state = -1;
+	__s16 mode = -1;
+	__u16 flags = 0;
+	struct rtattr *nest;
+	int ret;
+
+	while (argc > 0) {
+		if (strcmp(*argv, "dev") == 0) {
+			NEXT_ARG();
+			d = *argv;
+		} else if (strcmp(*argv, "guard") == 0) {
+			NEXT_ARG();
+			bpdu_guard = parse_on_off("guard", *argv, &ret);
+			if (ret)
+				return ret;
+		} else if (strcmp(*argv, "hairpin") == 0) {
+			NEXT_ARG();
+			hairpin = parse_on_off("hairpin", *argv, &ret);
+			if (ret)
+				return ret;
+		} else if (strcmp(*argv, "fastleave") == 0) {
+			NEXT_ARG();
+			fast_leave = parse_on_off("fastleave", *argv, &ret);
+			if (ret)
+				return ret;
+		} else if (strcmp(*argv, "root_block") == 0) {
+			NEXT_ARG();
+			root_block = parse_on_off("root_block", *argv, &ret);
+			if (ret)
+				return ret;
+		} else if (strcmp(*argv, "learning") == 0) {
+			NEXT_ARG();
+			learning = parse_on_off("learning", *argv, &ret);
+			if (ret)
+				return ret;
+		} else if (strcmp(*argv, "learning_sync") == 0) {
+			NEXT_ARG();
+			learning_sync = parse_on_off("learning_sync", *argv, &ret);
+			if (ret)
+				return ret;
+		} else if (strcmp(*argv, "flood") == 0) {
+			NEXT_ARG();
+			flood = parse_on_off("flood", *argv, &ret);
+			if (ret)
+				return ret;
+		} else if (strcmp(*argv, "mcast_router") == 0) {
+			NEXT_ARG();
+			mcast_router = atoi(*argv);
+		} else if (strcmp(*argv, "mcast_flood") == 0) {
+			NEXT_ARG();
+			mcast_flood = parse_on_off("mcast_flood", *argv, &ret);
+			if (ret)
+				return ret;
+		} else if (strcmp(*argv, "bcast_flood") == 0) {
+			NEXT_ARG();
+			bcast_flood = parse_on_off("bcast_flood", *argv, &ret);
+			if (ret)
+				return ret;
+		} else if (strcmp(*argv, "mcast_to_unicast") == 0) {
+			NEXT_ARG();
+			mcast_to_unicast = parse_on_off("mcast_to_unicast", *argv, &ret);
+			if (ret)
+				return ret;
+		} else if (strcmp(*argv, "cost") == 0) {
+			NEXT_ARG();
+			cost = atoi(*argv);
+		} else if (strcmp(*argv, "priority") == 0) {
+			NEXT_ARG();
+			priority = atoi(*argv);
+		} else if (strcmp(*argv, "state") == 0) {
+			NEXT_ARG();
+			char *endptr;
+
+			state = strtol(*argv, &endptr, 10);
+			if (!(**argv != '\0' && *endptr == '\0')) {
+				state = parse_stp_state(*argv);
+				if (state == -1) {
+					fprintf(stderr,
+						"Error: invalid STP port state\n");
+					return -1;
+				}
+			}
+		} else if (strcmp(*argv, "hwmode") == 0) {
+			NEXT_ARG();
+			flags = BRIDGE_FLAGS_SELF;
+			if (strcmp(*argv, "vepa") == 0)
+				mode = BRIDGE_MODE_VEPA;
+			else if (strcmp(*argv, "veb") == 0)
+				mode = BRIDGE_MODE_VEB;
+			else {
+				fprintf(stderr,
+					"Mode argument must be \"vepa\" or \"veb\".\n");
+				return -1;
+			}
+		} else if (strcmp(*argv, "self") == 0) {
+			flags |= BRIDGE_FLAGS_SELF;
+		} else if (strcmp(*argv, "master") == 0) {
+			flags |= BRIDGE_FLAGS_MASTER;
+		} else if (strcmp(*argv, "neigh_suppress") == 0) {
+			NEXT_ARG();
+			neigh_suppress = parse_on_off("neigh_suppress", *argv, &ret);
+			if (ret)
+				return ret;
+		} else if (strcmp(*argv, "vlan_tunnel") == 0) {
+			NEXT_ARG();
+			vlan_tunnel = parse_on_off("vlan_tunnel", *argv, &ret);
+			if (ret)
+				return ret;
+		} else if (strcmp(*argv, "isolated") == 0) {
+			NEXT_ARG();
+			isolated = parse_on_off("isolated", *argv, &ret);
+			if (ret)
+				return ret;
+		} else if (strcmp(*argv, "locked") == 0) {
+			NEXT_ARG();
+			locked = parse_on_off("locked", *argv, &ret);
+			if (ret)
+				return ret;
+		} else if (strcmp(*argv, "backup_port") == 0) {
+			NEXT_ARG();
+			backup_port_idx = ll_name_to_index(*argv);
+			if (!backup_port_idx) {
+				fprintf(stderr, "Error: device %s does not exist\n",
+					*argv);
+				return -1;
+			}
+		} else if (strcmp(*argv, "nobackup_port") == 0) {
+			backup_port_idx = 0;
+		} else {
+			usage();
+		}
+		argc--; argv++;
+	}
+	if (d == NULL) {
+		fprintf(stderr, "Device is a required argument.\n");
+		return -1;
+	}
+
+
+	req.ifm.ifi_index = ll_name_to_index(d);
+	if (req.ifm.ifi_index == 0) {
+		fprintf(stderr, "Cannot find bridge device \"%s\"\n", d);
+		return -1;
+	}
+
+	/* Nested PROTINFO attribute.  Contains: port flags, cost, priority and
+	 * state.
+	 */
+	nest = addattr_nest(&req.n, sizeof(req),
+			    IFLA_PROTINFO | NLA_F_NESTED);
+	/* Flags first */
+	if (bpdu_guard >= 0)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_GUARD, bpdu_guard);
+	if (hairpin >= 0)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_MODE, hairpin);
+	if (fast_leave >= 0)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_FAST_LEAVE,
+			 fast_leave);
+	if (root_block >= 0)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_PROTECT, root_block);
+	if (flood >= 0)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_UNICAST_FLOOD, flood);
+	if (mcast_router >= 0)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_MULTICAST_ROUTER,
+			 mcast_router);
+	if (mcast_flood >= 0)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_MCAST_FLOOD,
+			 mcast_flood);
+	if (bcast_flood >= 0)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_BCAST_FLOOD,
+			 bcast_flood);
+	if (mcast_to_unicast >= 0)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_MCAST_TO_UCAST,
+			 mcast_to_unicast);
+	if (learning >= 0)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING, learning);
+	if (learning_sync >= 0)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING_SYNC,
+			 learning_sync);
+
+	if (cost > 0)
+		addattr32(&req.n, sizeof(req), IFLA_BRPORT_COST, cost);
+
+	if (priority >= 0)
+		addattr16(&req.n, sizeof(req), IFLA_BRPORT_PRIORITY, priority);
+
+	if (state >= 0)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_STATE, state);
+
+	if (neigh_suppress != -1)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_NEIGH_SUPPRESS,
+			 neigh_suppress);
+	if (vlan_tunnel != -1)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_VLAN_TUNNEL,
+			 vlan_tunnel);
+	if (isolated != -1)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_ISOLATED, isolated);
+
+	if (locked >= 0)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_LOCKED, locked);
+
+	if (backup_port_idx != -1)
+		addattr32(&req.n, sizeof(req), IFLA_BRPORT_BACKUP_PORT,
+			  backup_port_idx);
+
+	addattr_nest_end(&req.n, nest);
+
+	/* IFLA_AF_SPEC nested attribute. Contains IFLA_BRIDGE_FLAGS that
+	 * designates master or self operation and IFLA_BRIDGE_MODE
+	 * for hw 'vepa' or 'veb' operation modes. The hwmodes are
+	 * only valid in 'self' mode on some devices so far.
+	 */
+	if (mode >= 0 || flags > 0) {
+		nest = addattr_nest(&req.n, sizeof(req), IFLA_AF_SPEC);
+
+		if (flags > 0)
+			addattr16(&req.n, sizeof(req), IFLA_BRIDGE_FLAGS, flags);
+
+		if (mode >= 0)
+			addattr16(&req.n, sizeof(req), IFLA_BRIDGE_MODE, mode);
+
+		addattr_nest_end(&req.n, nest);
+	}
+
+	if (rtnl_talk(&rth, &req.n, NULL) < 0)
+		return -1;
+
+	return 0;
+}
+
+static int brlink_show(int argc, char **argv)
+{
+	char *filter_dev = NULL;
+
+	while (argc > 0) {
+		if (strcmp(*argv, "dev") == 0) {
+			NEXT_ARG();
+			if (filter_dev)
+				duparg("dev", *argv);
+			filter_dev = *argv;
+		}
+		argc--; argv++;
+	}
+
+	if (filter_dev) {
+		filter_index = ll_name_to_index(filter_dev);
+		if (!filter_index)
+			return nodev(filter_dev);
+	}
+
+	if (rtnl_linkdump_req(&rth, PF_BRIDGE) < 0) {
+		perror("Cannot send dump request");
+		exit(1);
+	}
+
+	new_json_obj(json);
+	if (rtnl_dump_filter(&rth, print_linkinfo, stdout) < 0) {
+		fprintf(stderr, "Dump terminated\n");
+		exit(1);
+	}
+
+	delete_json_obj();
+	fflush(stdout);
+	return 0;
+}
+
+int do_link(int argc, char **argv)
+{
+	ll_init_map(&rth);
+	timestamp = 0;
+
+	if (argc > 0) {
+		if (matches(*argv, "set") == 0 ||
+		    matches(*argv, "change") == 0)
+			return brlink_modify(argc-1, argv+1);
+		if (matches(*argv, "show") == 0 ||
+		    matches(*argv, "lst") == 0 ||
+		    matches(*argv, "list") == 0)
+			return brlink_show(argc-1, argv+1);
+		if (matches(*argv, "help") == 0)
+			usage();
+	} else
+		return brlink_show(0, NULL);
+
+	fprintf(stderr, "Command \"%s\" is unknown, try \"bridge link help\".\n", *argv);
+	exit(-1);
+}