1 /* Copyright (c) 2008, 2009 Nicira Networks
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
18 #include <asm/param.h>
25 #include <linux/genetlink.h>
26 #include <linux/rtnetlink.h>
30 #include <sys/types.h>
37 #include "command-line.h"
42 #include "dynamic-string.h"
43 #include "fatal-signal.h"
45 #include "leak-checker.h"
49 #include "openvswitch/brcompat-netlink.h"
51 #include "poll-loop.h"
60 #define THIS_MODULE VLM_brcompatd
63 /* xxx Just hangs if datapath is rmmod/insmod. Learn to reconnect? */
65 /* Actions to modify bridge compatibility configuration. */
73 static void parse_options(int argc, char *argv[]);
74 static void usage(void) NO_RETURN;
76 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 60);
78 /* Maximum number of milliseconds to wait for the config file to be
79 * unlocked. If set to zero, no waiting will occur. */
80 static int lock_timeout = 500;
82 /* Maximum number of milliseconds to wait before pruning port entries that
83 * no longer exist. If set to zero, ports are never pruned. */
84 static int prune_timeout = 5000;
86 /* Config file shared with ovs-vswitchd (usually ovs-vswitchd.conf). */
87 static char *config_file;
89 /* Shell command to execute (via popen()) to send a control command to the
90 * running ovs-vswitchd process. The string must contain one instance of %s,
91 * which is replaced by the control command. */
92 static char *appctl_command;
94 /* Netlink socket to listen for interface changes. */
95 static struct nl_sock *rtnl_sock;
97 /* Netlink socket to bridge compatibility kernel module. */
98 static struct nl_sock *brc_sock;
100 /* The Generic Netlink family number used for bridge compatibility. */
101 static int brc_family;
103 static const struct nl_policy brc_multicast_policy[] = {
104 [BRC_GENL_A_MC_GROUP] = {.type = NL_A_U32 }
107 static const struct nl_policy rtnlgrp_link_policy[] = {
108 [IFLA_IFNAME] = { .type = NL_A_STRING, .optional = false },
109 [IFLA_MASTER] = { .type = NL_A_U32, .optional = true },
113 lookup_brc_multicast_group(int *multicast_group)
115 struct nl_sock *sock;
116 struct ofpbuf request, *reply;
117 struct nlattr *attrs[ARRAY_SIZE(brc_multicast_policy)];
120 retval = nl_sock_create(NETLINK_GENERIC, 0, 0, 0, &sock);
124 ofpbuf_init(&request, 0);
125 nl_msg_put_genlmsghdr(&request, sock, 0, brc_family,
126 NLM_F_REQUEST, BRC_GENL_C_QUERY_MC, 1);
127 retval = nl_sock_transact(sock, &request, &reply);
128 ofpbuf_uninit(&request);
130 nl_sock_destroy(sock);
133 if (!nl_policy_parse(reply, NLMSG_HDRLEN + GENL_HDRLEN,
134 brc_multicast_policy, attrs,
135 ARRAY_SIZE(brc_multicast_policy))) {
136 nl_sock_destroy(sock);
137 ofpbuf_delete(reply);
140 *multicast_group = nl_attr_get_u32(attrs[BRC_GENL_A_MC_GROUP]);
141 nl_sock_destroy(sock);
142 ofpbuf_delete(reply);
147 /* Opens a socket for brcompat notifications. Returns 0 if successful,
148 * otherwise a positive errno value. */
150 brc_open(struct nl_sock **sock)
152 int multicast_group = 0;
155 retval = nl_lookup_genl_family(BRC_GENL_FAMILY_NAME, &brc_family);
160 retval = lookup_brc_multicast_group(&multicast_group);
165 retval = nl_sock_create(NETLINK_GENERIC, multicast_group, 0, 0, sock);
173 static const struct nl_policy brc_dp_policy[] = {
174 [BRC_GENL_A_DP_NAME] = { .type = NL_A_STRING },
178 bridge_exists(const char *name)
180 return cfg_has_section("bridge.%s", name);
184 execute_appctl_command(const char *unixctl_command, char **output)
186 char *stdout_log, *stderr_log;
192 argv[2] = xasprintf(appctl_command, unixctl_command);
195 /* Run process and log status. */
196 error = process_run_capture(argv, &stdout_log, &stderr_log, &status);
198 VLOG_ERR("failed to execute %s command via ovs-appctl: %s",
199 unixctl_command, strerror(error));
201 char *msg = process_status_msg(status);
202 VLOG_ERR("ovs-appctl exited with error (%s)", msg);
207 /* Deal with stdout_log. */
209 *output = stdout_log;
214 /* Deal with stderr_log */
215 if (stderr_log && *stderr_log) {
216 VLOG_INFO("ovs-appctl wrote to stderr:\n%s", stderr_log);
226 rewrite_and_reload_config(void)
228 if (cfg_is_dirty()) {
229 int error1 = cfg_write();
230 int error2 = cfg_read();
231 long long int reload_start = time_msec();
232 int error3 = execute_appctl_command("vswitchd/reload", NULL);
233 long long int elapsed = time_msec() - reload_start;
234 COVERAGE_INC(brcompatd_reload);
236 VLOG_INFO("reload command executed in %lld ms", elapsed);
238 return error1 ? error1 : error2 ? error2 : error3;
243 /* Get all the interfaces for 'bridge' as 'ifaces', breaking bonded interfaces
244 * down into their constituent parts.
246 * If 'vlan' < 0, all interfaces on 'bridge' are reported. If 'vlan' == 0,
247 * then only interfaces for trunk ports or ports with implicit VLAN 0 are
248 * reported. If 'vlan' > 0, only interfaces with implict VLAN 'vlan' are
251 get_bridge_ifaces(const char *bridge, struct svec *ifaces, int vlan)
258 cfg_get_all_keys(&ports, "bridge.%s.port", bridge);
259 for (i = 0; i < ports.n; i++) {
260 const char *port_name = ports.names[i];
262 int port_vlan = cfg_get_vlan(0, "vlan.%s.tag", port_name);
266 if (vlan != port_vlan) {
270 if (cfg_has_section("bonding.%s", port_name)) {
273 cfg_get_all_keys(&slaves, "bonding.%s.slave", port_name);
274 svec_append(ifaces, &slaves);
275 svec_destroy(&slaves);
277 svec_add(ifaces, port_name);
280 svec_destroy(&ports);
283 /* Go through the configuration file and remove any ports that no longer
284 * exist associated with a bridge. */
290 struct svec bridges, delete;
292 if (cfg_lock(NULL, 0)) {
293 /* Couldn't lock config file. */
299 cfg_get_subsections(&bridges, "bridge");
300 for (i=0; i<bridges.n; i++) {
301 const char *br_name = bridges.names[i];
304 /* Check that each bridge interface exists. */
305 get_bridge_ifaces(br_name, &ifaces, -1);
306 for (j = 0; j < ifaces.n; j++) {
307 const char *iface_name = ifaces.names[j];
308 enum netdev_flags flags;
310 /* The local port and internal ports are created and destroyed by
311 * ovs-vswitchd itself, so don't bother checking for them at all.
312 * In practice, they might not exist if ovs-vswitchd hasn't
313 * finished reloading since the configuration file was updated. */
314 if (!strcmp(iface_name, br_name)
315 || cfg_get_bool(0, "iface.%s.internal", iface_name)) {
319 error = netdev_nodev_get_flags(iface_name, &flags);
320 if (error == ENODEV) {
321 VLOG_INFO_RL(&rl, "removing dead interface %s from %s",
322 iface_name, br_name);
323 svec_add(&delete, iface_name);
325 VLOG_INFO_RL(&rl, "unknown error %d on interface %s from %s",
326 error, iface_name, br_name);
329 svec_destroy(&ifaces);
331 svec_destroy(&bridges);
336 for (i = 0; i < delete.n; i++) {
337 cfg_del_match("bridge.*.port=%s", delete.names[i]);
338 cfg_del_match("bonding.*.slave=%s", delete.names[i]);
340 rewrite_and_reload_config();
345 svec_destroy(&delete);
349 /* Checks whether a network device named 'name' exists and returns true if so,
352 * XXX it is possible that this doesn't entirely accomplish what we want in
353 * context, since ovs-vswitchd.conf may cause vswitchd to create or destroy
354 * network devices based on iface.*.internal settings.
356 * XXX may want to move this to lib/netdev.
358 * XXX why not just use netdev_nodev_get_flags() or similar function? */
360 netdev_exists(const char *name)
366 filename = xasprintf("/sys/class/net/%s", name);
367 error = stat(filename, &s);
373 add_bridge(const char *br_name)
375 if (bridge_exists(br_name)) {
376 VLOG_WARN("addbr %s: bridge %s exists", br_name, br_name);
378 } else if (netdev_exists(br_name)) {
379 if (cfg_get_bool(0, "iface.%s.fake-bridge", br_name)) {
380 VLOG_WARN("addbr %s: %s exists as a fake bridge",
384 VLOG_WARN("addbr %s: cannot create bridge %s because a network "
385 "device named %s already exists",
386 br_name, br_name, br_name);
391 cfg_add_entry("bridge.%s.port=%s", br_name, br_name);
392 VLOG_INFO("addbr %s: success", br_name);
398 del_bridge(const char *br_name)
400 if (!bridge_exists(br_name)) {
401 VLOG_WARN("delbr %s: no bridge named %s", br_name, br_name);
405 cfg_del_section("bridge.%s", br_name);
406 VLOG_INFO("delbr %s: success", br_name);
412 parse_command(struct ofpbuf *buffer, uint32_t *seq, const char **br_name,
413 const char **port_name, uint64_t *count, uint64_t *skip)
415 static const struct nl_policy policy[] = {
416 [BRC_GENL_A_DP_NAME] = { .type = NL_A_STRING, .optional = true },
417 [BRC_GENL_A_PORT_NAME] = { .type = NL_A_STRING, .optional = true },
418 [BRC_GENL_A_FDB_COUNT] = { .type = NL_A_U64, .optional = true },
419 [BRC_GENL_A_FDB_SKIP] = { .type = NL_A_U64, .optional = true },
421 struct nlattr *attrs[ARRAY_SIZE(policy)];
423 if (!nl_policy_parse(buffer, NLMSG_HDRLEN + GENL_HDRLEN, policy,
424 attrs, ARRAY_SIZE(policy))
425 || (br_name && !attrs[BRC_GENL_A_DP_NAME])
426 || (port_name && !attrs[BRC_GENL_A_PORT_NAME])
427 || (count && !attrs[BRC_GENL_A_FDB_COUNT])
428 || (skip && !attrs[BRC_GENL_A_FDB_SKIP])) {
432 *seq = ((struct nlmsghdr *) buffer->data)->nlmsg_seq;
434 *br_name = nl_attr_get_string(attrs[BRC_GENL_A_DP_NAME]);
437 *port_name = nl_attr_get_string(attrs[BRC_GENL_A_PORT_NAME]);
440 *count = nl_attr_get_u64(attrs[BRC_GENL_A_FDB_COUNT]);
443 *skip = nl_attr_get_u64(attrs[BRC_GENL_A_FDB_SKIP]);
448 /* Composes and returns a reply to a request made by the datapath with Netlink
449 * sequence number 'seq' and error code 'error'. The caller may add additional
450 * attributes to the message, then it may send it with send_reply(). */
451 static struct ofpbuf *
452 compose_reply(uint32_t seq, int error)
454 struct ofpbuf *reply = ofpbuf_new(4096);
455 nl_msg_put_genlmsghdr(reply, brc_sock, 32, brc_family, NLM_F_REQUEST,
456 BRC_GENL_C_DP_RESULT, 1);
457 ((struct nlmsghdr *) reply->data)->nlmsg_seq = seq;
458 nl_msg_put_u32(reply, BRC_GENL_A_ERR_CODE, error);
462 /* Sends 'reply' to the datapath and frees it. */
464 send_reply(struct ofpbuf *reply)
466 int retval = nl_sock_send(brc_sock, reply, false);
468 VLOG_WARN_RL(&rl, "replying to brcompat request: %s",
471 ofpbuf_delete(reply);
474 /* Composes and sends a reply to a request made by the datapath with Netlink
475 * sequence number 'seq' and error code 'error'. */
477 send_simple_reply(uint32_t seq, int error)
479 send_reply(compose_reply(seq, error));
483 handle_bridge_cmd(struct ofpbuf *buffer, bool add)
489 error = parse_command(buffer, &seq, &br_name, NULL, NULL, NULL);
491 error = add ? add_bridge(br_name) : del_bridge(br_name);
493 error = rewrite_and_reload_config();
495 send_simple_reply(seq, error);
500 static const struct nl_policy brc_port_policy[] = {
501 [BRC_GENL_A_DP_NAME] = { .type = NL_A_STRING },
502 [BRC_GENL_A_PORT_NAME] = { .type = NL_A_STRING },
506 del_port(const char *br_name, const char *port_name)
508 cfg_del_entry("bridge.%s.port=%s", br_name, port_name);
509 cfg_del_match("bonding.*.slave=%s", port_name);
510 cfg_del_match("vlan.%s.*", port_name);
514 handle_port_cmd(struct ofpbuf *buffer, bool add)
516 const char *cmd_name = add ? "add-if" : "del-if";
517 const char *br_name, *port_name;
521 error = parse_command(buffer, &seq, &br_name, &port_name, NULL, NULL);
523 if (!bridge_exists(br_name)) {
524 VLOG_WARN("%s %s %s: no bridge named %s",
525 cmd_name, br_name, port_name, br_name);
527 } else if (!netdev_exists(port_name)) {
528 VLOG_WARN("%s %s %s: no network device named %s",
529 cmd_name, br_name, port_name, port_name);
533 cfg_add_entry("bridge.%s.port=%s", br_name, port_name);
535 del_port(br_name, port_name);
537 VLOG_INFO("%s %s %s: success", cmd_name, br_name, port_name);
538 error = rewrite_and_reload_config();
540 send_simple_reply(seq, error);
546 /* Returns the name of the bridge that contains a port named 'port_name', as a
547 * malloc'd string that the caller must free, or a null pointer if no bridge
548 * contains a port named 'port_name'. */
550 get_bridge_containing_port(const char *port_name)
553 const char *start, *end;
556 cfg_get_matches(&matches, "bridge.*.port=%s", port_name);
561 start = matches.names[0] + strlen("bridge.");
562 end = strstr(start, ".port=");
564 return xmemdup0(start, end - start);
568 linux_bridge_to_ovs_bridge(const char *linux_bridge,
569 char **ovs_bridge, int *br_vlan)
571 if (bridge_exists(linux_bridge)) {
572 /* Bridge name is the same. We are interested in VLAN 0. */
573 *ovs_bridge = xstrdup(linux_bridge);
577 /* No such Open vSwitch bridge 'linux_bridge', but there might be an
578 * internal port named 'linux_bridge' on some other bridge
579 * 'ovs_bridge'. If so then we are interested in the VLAN assigned to
580 * port 'linux_bridge' on the bridge named 'ovs_bridge'. */
581 const char *port_name = linux_bridge;
583 *ovs_bridge = get_bridge_containing_port(port_name);
584 *br_vlan = cfg_get_vlan(0, "vlan.%s.tag", port_name);
585 if (*ovs_bridge && *br_vlan >= 0) {
595 handle_fdb_query_cmd(struct ofpbuf *buffer)
597 /* This structure is copied directly from the Linux 2.6.30 header files.
598 * It would be more straightforward to #include <linux/if_bridge.h>, but
599 * the 'port_hi' member was only introduced in Linux 2.6.26 and so systems
600 * with old header files won't have it. */
605 __u32 ageing_timer_value;
614 struct mac *local_macs;
618 /* Impedance matching between the vswitchd and Linux kernel notions of what
619 * a bridge is. The kernel only handles a single VLAN per bridge, but
620 * vswitchd can deal with all the VLANs on a single bridge. We have to
621 * pretend that the former is the case even though the latter is the
623 const char *linux_bridge; /* Name used by brctl. */
624 char *ovs_bridge; /* Name used by ovs-vswitchd. */
625 int br_vlan; /* VLAN tag. */
628 struct ofpbuf query_data;
629 struct ofpbuf *reply;
630 char *unixctl_command;
631 uint64_t count, skip;
637 /* Parse the command received from brcompat_mod. */
638 error = parse_command(buffer, &seq, &linux_bridge, NULL, &count, &skip);
643 /* Figure out vswitchd bridge and VLAN. */
645 error = linux_bridge_to_ovs_bridge(linux_bridge, &ovs_bridge, &br_vlan);
647 send_simple_reply(seq, error);
651 /* Fetch the forwarding database using ovs-appctl. */
652 unixctl_command = xasprintf("fdb/show %s", ovs_bridge);
653 error = execute_appctl_command(unixctl_command, &output);
654 free(unixctl_command);
657 send_simple_reply(seq, error);
661 /* Fetch the MAC address for each interface on the bridge, so that we can
662 * fill in the is_local field in the response. */
663 get_bridge_ifaces(ovs_bridge, &ifaces, br_vlan);
664 local_macs = xmalloc(ifaces.n * sizeof *local_macs);
666 for (i = 0; i < ifaces.n; i++) {
667 const char *iface_name = ifaces.names[i];
668 struct mac *mac = &local_macs[n_local_macs];
669 if (!netdev_nodev_get_etheraddr(iface_name, mac->addr)) {
673 svec_destroy(&ifaces);
675 /* Parse the response from ovs-appctl and convert it to binary format to
676 * pass back to the kernel. */
677 ofpbuf_init(&query_data, sizeof(struct __fdb_entry) * 8);
679 strtok_r(output, "\n", &save_ptr); /* Skip header line. */
681 struct __fdb_entry *entry;
683 uint8_t mac[ETH_ADDR_LEN];
687 line = strtok_r(NULL, "\n", &save_ptr);
692 if (sscanf(line, "%d %d "ETH_ADDR_SCAN_FMT" %d",
693 &port, &vlan, ETH_ADDR_SCAN_ARGS(mac), &age)
694 != 2 + ETH_ADDR_SCAN_COUNT + 1) {
695 struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
696 VLOG_INFO_RL(&rl, "fdb/show output has invalid format: %s", line);
700 if (vlan != br_vlan) {
709 /* Is this the MAC address of an interface on the bridge? */
711 for (i = 0; i < n_local_macs; i++) {
712 if (eth_addr_equals(local_macs[i].addr, mac)) {
718 entry = ofpbuf_put_uninit(&query_data, sizeof *entry);
719 memcpy(entry->mac_addr, mac, ETH_ADDR_LEN);
720 entry->port_no = port & 0xff;
721 entry->is_local = is_local;
722 entry->ageing_timer_value = age * HZ;
723 entry->port_hi = (port & 0xff00) >> 8;
730 /* Compose and send reply to datapath. */
731 reply = compose_reply(seq, 0);
732 nl_msg_put_unspec(reply, BRC_GENL_A_FDB_DATA,
733 query_data.data, query_data.size);
737 ofpbuf_uninit(&query_data);
744 brc_recv_update(void)
747 struct ofpbuf *buffer;
748 struct genlmsghdr *genlmsghdr;
753 ofpbuf_delete(buffer);
754 retval = nl_sock_recv(brc_sock, &buffer, false);
755 } while (retval == ENOBUFS
757 && (nl_msg_nlmsgerr(buffer, NULL)
758 || nl_msg_nlmsghdr(buffer)->nlmsg_type == NLMSG_DONE)));
760 if (retval != EAGAIN) {
761 VLOG_WARN_RL(&rl, "brc_recv_update: %s", strerror(retval));
766 genlmsghdr = nl_msg_genlmsghdr(buffer);
768 VLOG_WARN_RL(&rl, "received packet too short for generic NetLink");
772 if (nl_msg_nlmsghdr(buffer)->nlmsg_type != brc_family) {
773 VLOG_DBG_RL(&rl, "received type (%"PRIu16") != brcompat family (%d)",
774 nl_msg_nlmsghdr(buffer)->nlmsg_type, brc_family);
778 if (cfg_lock(NULL, lock_timeout)) {
779 /* Couldn't lock config file. */
784 switch (genlmsghdr->cmd) {
785 case BRC_GENL_C_DP_ADD:
786 retval = handle_bridge_cmd(buffer, true);
789 case BRC_GENL_C_DP_DEL:
790 retval = handle_bridge_cmd(buffer, false);
793 case BRC_GENL_C_PORT_ADD:
794 retval = handle_port_cmd(buffer, true);
797 case BRC_GENL_C_PORT_DEL:
798 retval = handle_port_cmd(buffer, false);
801 case BRC_GENL_C_FDB_QUERY:
802 retval = handle_fdb_query_cmd(buffer);
812 ofpbuf_delete(buffer);
816 /* Check for interface configuration changes announced through RTNL. */
818 rtnl_recv_update(void)
822 int error = nl_sock_recv(rtnl_sock, &buf, false);
823 if (error == EAGAIN) {
825 } else if (error == ENOBUFS) {
826 VLOG_WARN_RL(&rl, "network monitor socket overflowed");
828 VLOG_WARN_RL(&rl, "error on network monitor socket: %s",
831 struct nlattr *attrs[ARRAY_SIZE(rtnlgrp_link_policy)];
832 struct nlmsghdr *nlh;
833 struct ifinfomsg *iim;
835 nlh = ofpbuf_at(buf, 0, NLMSG_HDRLEN);
836 iim = ofpbuf_at(buf, NLMSG_HDRLEN, sizeof *iim);
838 VLOG_WARN_RL(&rl, "received bad rtnl message (no ifinfomsg)");
843 if (!nl_policy_parse(buf, NLMSG_HDRLEN + sizeof(struct ifinfomsg),
845 attrs, ARRAY_SIZE(rtnlgrp_link_policy))) {
846 VLOG_WARN_RL(&rl,"received bad rtnl message (policy)");
850 if (nlh->nlmsg_type == RTM_DELLINK && attrs[IFLA_MASTER]) {
851 const char *port_name = nl_attr_get_string(attrs[IFLA_IFNAME]);
852 char br_name[IFNAMSIZ];
853 uint32_t br_idx = nl_attr_get_u32(attrs[IFLA_MASTER]);
855 enum netdev_flags flags;
857 if (!if_indextoname(br_idx, br_name)) {
862 if (cfg_lock(NULL, lock_timeout)) {
863 /* Couldn't lock config file. */
864 /* xxx this should try again and print error msg. */
869 if (netdev_nodev_get_flags(port_name, &flags) == ENODEV) {
870 /* Network device is really gone. */
871 VLOG_INFO("network device %s destroyed, "
872 "removing from bridge %s", port_name, br_name);
874 cfg_get_all_keys(&ports, "bridge.%s.port", br_name);
876 if (svec_contains(&ports, port_name)) {
877 del_port(br_name, port_name);
878 rewrite_and_reload_config();
881 /* A network device by that name exists even though the kernel
882 * told us it had disappeared. Probably, what happened was
885 * 1. Device destroyed.
886 * 2. Notification sent to us.
887 * 3. New device created with same name as old one.
888 * 4. ovs-brcompatd notified, removes device from bridge.
890 * There's no a priori reason that in this situation that the
891 * new device with the same name should remain in the bridge;
892 * on the contrary, that would be unexpected. *But* there is
893 * one important situation where, if we do this, bad things
894 * happen. This is the case of XenServer Tools version 5.0.0,
895 * which on boot of a Windows VM cause something like this to
896 * happen on the Xen host:
898 * i. Create tap1.0 and vif1.0.
900 * iii. Delete vif1.0.
901 * iv. Re-create vif1.0.
903 * (XenServer Tools 5.5.0 does not exhibit this behavior, and
904 * neither does a VM without Tools installed at all.@.)
906 * Steps iii and iv happen within a few seconds of each other.
907 * Step iv causes /etc/xensource/scripts/vif to run, which in
908 * turn calls ovs-cfg-mod to add the new device to the bridge.
909 * If step iv happens after step 4 (in our first list of
910 * steps), then all is well, but if it happens between 3 and 4
911 * (which can easily happen if ovs-brcompatd has to wait to
912 * lock the configuration file), then we will remove the new
913 * incarnation from the bridge instead of the old one!
915 * So, to avoid this problem, we do nothing here. This is
916 * strictly incorrect except for this one particular case, and
917 * perhaps that will bite us someday. If that happens, then we
918 * will have to somehow track network devices by ifindex, since
919 * a new device will have a new ifindex even if it has the same
920 * name as an old device.
922 VLOG_INFO("kernel reported network device %s removed but "
923 "a device by that name exists (XS Tools 5.0.0?)",
933 main(int argc, char *argv[])
935 struct unixctl_server *unixctl;
938 set_program_name(argv[0]);
939 register_fault_handlers();
942 parse_options(argc, argv);
943 signal(SIGPIPE, SIG_IGN);
946 die_if_already_running();
949 retval = unixctl_server_create(NULL, &unixctl);
951 ovs_fatal(retval, "could not listen for vlog connections");
954 if (brc_open(&brc_sock)) {
955 ovs_fatal(0, "could not open brcompat socket. Check "
956 "\"brcompat\" kernel module.");
960 if (nl_sock_create(NETLINK_ROUTE, RTNLGRP_LINK, 0, 0, &rtnl_sock)) {
961 ovs_fatal(0, "could not create rtnetlink socket");
967 ovs_fatal(retval, "could not read config file");
971 unixctl_server_run(unixctl);
974 /* If 'prune_timeout' is non-zero, we actively prune from the
975 * config file any 'bridge.<br_name>.port' entries that are no
976 * longer valid. We use two methods:
978 * 1) The kernel explicitly notifies us of removed ports
979 * through the RTNL messages.
981 * 2) We periodically check all ports associated with bridges
982 * to see if they no longer exist.
988 nl_sock_wait(rtnl_sock, POLLIN);
989 poll_timer_wait(prune_timeout);
992 nl_sock_wait(brc_sock, POLLIN);
993 unixctl_server_wait(unixctl);
1001 validate_appctl_command(void)
1007 for (p = strchr(appctl_command, '%'); p; p = strchr(p + 2, '%')) {
1009 /* Nothing to do. */
1010 } else if (p[1] == 's') {
1013 ovs_fatal(0, "only '%%s' and '%%%%' allowed in --appctl-command");
1017 ovs_fatal(0, "'%%s' must appear exactly once in --appctl-command");
1022 parse_options(int argc, char *argv[])
1025 OPT_LOCK_TIMEOUT = UCHAR_MAX + 1,
1029 LEAK_CHECKER_OPTION_ENUMS
1031 static struct option long_options[] = {
1032 {"help", no_argument, 0, 'h'},
1033 {"version", no_argument, 0, 'V'},
1034 {"lock-timeout", required_argument, 0, OPT_LOCK_TIMEOUT},
1035 {"prune-timeout", required_argument, 0, OPT_PRUNE_TIMEOUT},
1036 {"appctl-command", required_argument, 0, OPT_APPCTL_COMMAND},
1037 DAEMON_LONG_OPTIONS,
1039 LEAK_CHECKER_LONG_OPTIONS,
1042 char *short_options = long_options_to_short_options(long_options);
1045 appctl_command = xasprintf("%s/ovs-appctl -t "
1046 "%s/ovs-vswitchd.`cat %s/ovs-vswitchd.pid`.ctl "
1048 ovs_bindir, ovs_rundir, ovs_rundir);
1052 c = getopt_long(argc, argv, short_options, long_options, NULL);
1063 OVS_PRINT_VERSION(0, 0);
1066 case OPT_LOCK_TIMEOUT:
1067 lock_timeout = atoi(optarg);
1070 case OPT_PRUNE_TIMEOUT:
1071 prune_timeout = atoi(optarg) * 1000;
1074 case OPT_APPCTL_COMMAND:
1075 appctl_command = optarg;
1078 VLOG_OPTION_HANDLERS
1079 DAEMON_OPTION_HANDLERS
1080 LEAK_CHECKER_OPTION_HANDLERS
1089 free(short_options);
1091 validate_appctl_command();
1097 ovs_fatal(0, "exactly one non-option argument required; "
1098 "use --help for usage");
1102 config_file = argv[0];
1103 error = cfg_set_file(config_file);
1105 ovs_fatal(error, "failed to add configuration file \"%s\"",
1113 printf("%s: bridge compatibility front-end for ovs-vswitchd\n"
1114 "usage: %s [OPTIONS] CONFIG\n"
1115 "CONFIG is the configuration file used by ovs-vswitchd.\n",
1116 program_name, program_name);
1117 printf("\nConfiguration options:\n"
1118 " --appctl-command=COMMAND shell command to run ovs-appctl\n"
1119 " --prune-timeout=SECS wait at most SECS before pruning ports\n"
1120 " --lock-timeout=MSECS wait at most MSECS for CONFIG to unlock\n"
1124 printf("\nOther options:\n"
1125 " -h, --help display this help message\n"
1126 " -V, --version display version information\n");
1127 leak_checker_usage();
1128 printf("\nThe default appctl command is:\n%s\n", appctl_command);