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-rw-r--r--bridge/link.c610
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);
+}
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