2 * vrrp.c - vrrp plugin action functions
4 * Copyright 2019-2020 Rubicon Communications, LLC (Netgate)
6 * SPDX-License-Identifier: Apache-2.0
10 #include <vnet/vnet.h>
11 #include <vnet/plugin/plugin.h>
12 #include <vnet/mfib/mfib_entry.h>
13 #include <vnet/mfib/mfib_table.h>
14 #include <vnet/adj/adj.h>
15 #include <vnet/adj/adj_mcast.h>
16 #include <vnet/fib/fib_table.h>
17 #include <vnet/ip/igmp_packet.h>
18 #include <vnet/ip/ip6_link.h>
20 #include <vrrp/vrrp.h>
21 #include <vrrp/vrrp_packet.h>
23 #include <vpp/app/version.h>
25 vrrp_main_t vrrp_main;
27 static const mac_address_t ipv4_vmac = {
28 .bytes = {0x00, 0x00, 0x5e, 0x00, 0x01, 0x00}
31 static const mac_address_t ipv6_vmac = {
32 .bytes = {0x00, 0x00, 0x5e, 0x00, 0x02, 0x00}
39 } vrrp_hwif_vr_count_t;
44 VRRP_IF_UPDATE_HW_LINK,
45 VRRP_IF_UPDATE_SW_ADMIN,
46 } vrrp_intf_update_type_t;
50 vrrp_intf_update_type_t type;
56 static int vrrp_intf_is_up (u32 sw_if_index, u8 is_ipv6,
57 vrrp_intf_update_t * pending);
60 vrrp_hwif_master_count_walk (vnet_main_t * vnm, u32 sw_if_index, void *arg)
62 vrrp_hwif_vr_count_t *vr_count = arg;
65 vr = vrrp_vr_lookup (sw_if_index, vr_count->key.vr_id,
66 vr_count->key.is_ipv6);
68 if (vr && (vr->runtime.state == VRRP_VR_STATE_MASTER))
75 * Get a count of VRs in master state on a given hardware interface with
76 * the provided VR ID and AF.
79 vrrp_vr_hwif_master_vrs_by_vrid (u32 hw_if_index, u8 vr_id, u8 is_ipv6)
81 vnet_main_t *vnm = vnet_get_main ();
82 vrrp_hwif_vr_count_t vr_count;
84 clib_memset (&vr_count, 0, sizeof (vr_count));
86 vr_count.key.vr_id = vr_id;
87 vr_count.key.is_ipv6 = is_ipv6;
89 vnet_hw_interface_walk_sw (vnm, hw_if_index,
90 vrrp_hwif_master_count_walk, &vr_count);
92 return vr_count.count;
96 * Add or delete the VR virtual MAC address on the hardware interface
97 * when a VR enters or leaves the master state.
99 * Multiple subinterfaces may host the same VR ID. We should only add or
100 * delete the virtual MAC if this is the first VR being enabled on the
101 * hardware interface or the last one being disabled, respectively.
104 vrrp_vr_transition_vmac (vrrp_vr_t * vr, vrrp_vr_state_t new_state)
106 vnet_main_t *vnm = vnet_get_main ();
107 clib_error_t *error = 0;
108 vnet_hw_interface_t *hw;
109 u8 enable = (new_state == VRRP_VR_STATE_MASTER);
112 hw = vnet_get_sup_hw_interface (vnm, vr->config.sw_if_index);
114 vrrp_vr_hwif_master_vrs_by_vrid (hw->hw_if_index, vr->config.vr_id,
115 vrrp_vr_is_ipv6 (vr));
117 /* enable only if current master vrs is 0, disable only if 0 or 1 */
118 if ((enable && !n_master_vrs) || (!enable && (n_master_vrs < 2)))
120 clib_warning ("%s virtual MAC address %U on hardware interface %u",
121 (enable) ? "Adding" : "Deleting",
122 format_ethernet_address, vr->runtime.mac.bytes,
125 error = vnet_hw_interface_add_del_mac_address
126 (vnm, hw->hw_if_index, vr->runtime.mac.bytes, enable);
130 clib_error_report (error);
134 * Manage VR interface data on transition to/from master:
135 * - enable or disable ARP/ND input feature if appropriate
136 * - update count of VRs in master state
139 vrrp_vr_transition_intf (vrrp_vr_t * vr, vrrp_vr_state_t new_state)
142 const char *arc_name = 0, *node_name = 0;
143 const char *mc_arc_name = 0, *mc_node_name = 0;
144 u8 is_ipv6 = vrrp_vr_is_ipv6 (vr);
146 int n_master_accept = 0;
151 arc_name = "ip6-local";
152 node_name = "vrrp6-nd-input";
153 mc_arc_name = "ip6-multicast";
154 mc_node_name = "vrrp6-accept-owner-input";
159 node_name = "vrrp4-arp-input";
160 mc_arc_name = "ip4-multicast";
161 mc_node_name = "vrrp4-accept-owner-input";
164 intf = vrrp_intf_get (vr->config.sw_if_index);
166 /* Check other VRs on this intf to see if features need to be toggled */
167 vec_foreach (vr_index, intf->vr_indices[is_ipv6])
169 vrrp_vr_t *intf_vr = vrrp_vr_lookup_index (*vr_index);
174 if (intf_vr->runtime.state == VRRP_VR_STATE_INIT)
179 if ((intf_vr->runtime.state == VRRP_VR_STATE_MASTER) &&
180 vrrp_vr_accept_mode_enabled (intf_vr))
184 /* If entering/leaving init state, start/stop ARP or ND feature if no other
185 * VRs are active on the interface.
187 if (((vr->runtime.state == VRRP_VR_STATE_INIT) ||
188 (new_state == VRRP_VR_STATE_INIT)) && (n_started == 0))
189 vnet_feature_enable_disable (arc_name, node_name,
190 vr->config.sw_if_index,
191 (new_state != VRRP_VR_STATE_INIT), NULL, 0);
193 /* Special housekeeping when entering/leaving master mode */
194 if ((vr->runtime.state == VRRP_VR_STATE_MASTER) ||
195 (new_state == VRRP_VR_STATE_MASTER))
197 /* Maintain count of master state VRs on interface */
198 if (new_state == VRRP_VR_STATE_MASTER)
199 intf->n_master_vrs[is_ipv6]++;
200 else if (intf->n_master_vrs[is_ipv6] > 0)
201 intf->n_master_vrs[is_ipv6]--;
203 /* If accept mode is enabled and no other master on intf has accept
204 * mode enabled, enable/disable feature node to avoid spurious drops by
207 if (vrrp_vr_accept_mode_enabled (vr) && !n_master_accept)
208 vnet_feature_enable_disable (mc_arc_name, mc_node_name,
209 vr->config.sw_if_index,
210 (new_state == VRRP_VR_STATE_MASTER),
215 /* If accept mode enabled, add/remove VR addresses from interface */
217 vrrp_vr_transition_addrs (vrrp_vr_t * vr, vrrp_vr_state_t new_state)
219 vlib_main_t *vm = vlib_get_main ();
221 ip46_address_t *vr_addr;
223 if (!vrrp_vr_accept_mode_enabled (vr))
226 /* owner always has VR addresses configured, should never remove them */
227 if (vrrp_vr_is_owner (vr))
230 if (vrrp_vr_is_unicast (vr))
233 /* only need to do something if entering or leaving master state */
234 if ((vr->runtime.state != VRRP_VR_STATE_MASTER) &&
235 (new_state != VRRP_VR_STATE_MASTER))
238 is_del = (new_state != VRRP_VR_STATE_MASTER);
240 clib_warning ("%s VR addresses on sw_if_index %u",
241 (is_del) ? "Deleting" : "Adding", vr->config.sw_if_index);
243 vec_foreach (vr_addr, vr->config.vr_addrs)
245 ip_interface_address_t *ia = NULL;
247 /* We need to know the address length to use, find it from another
248 * address on the interface. Or use a default (/24, /64).
250 if (!vrrp_vr_is_ipv6 (vr))
252 ip4_main_t *im = &ip4_main;
253 ip4_address_t *intf4;
256 ip4_interface_address_matching_destination
257 (im, &vr_addr->ip4, vr->config.sw_if_index, &ia);
259 ip4_add_del_interface_address (vm, vr->config.sw_if_index,
261 (intf4 ? ia->address_length : 24),
266 ip6_main_t *im = &ip6_main;
267 ip6_address_t *intf6;
270 ip6_interface_address_matching_destination
271 (im, &vr_addr->ip6, vr->config.sw_if_index, &ia);
273 ip6_add_del_interface_address (vm, vr->config.sw_if_index,
275 (intf6 ? ia->address_length : 64),
282 vrrp_vr_transition (vrrp_vr_t * vr, vrrp_vr_state_t new_state, void *data)
285 clib_warning ("VR %U transitioning to %U", format_vrrp_vr_key, vr,
286 format_vrrp_vr_state, new_state);
288 /* Don't do anything if transitioning to the state VR is already in.
289 * This should never happen, just covering our bases.
291 if (new_state == vr->runtime.state)
294 if (new_state == VRRP_VR_STATE_MASTER)
296 /* RFC 5798 sec 6.4.1 (105) - startup event for VR with priority 255
297 * sec 6.4.2 (365) - master down timer fires on backup VR
300 vrrp_vr_multicast_group_join (vr);
301 vrrp_adv_send (vr, 0);
302 vrrp_garp_or_na_send (vr);
304 vrrp_vr_timer_set (vr, VRRP_VR_TIMER_ADV);
306 else if (new_state == VRRP_VR_STATE_BACKUP)
308 /* RFC 5798 sec 6.4.1 (150) - startup event for VR with priority < 255
309 * sec 6.4.3 (735) - master preempted by higher priority VR
312 vrrp_vr_multicast_group_join (vr);
314 if (vr->runtime.state == VRRP_VR_STATE_MASTER)
316 vrrp_header_t *pkt = data;
317 vr->runtime.master_adv_int = vrrp_adv_int_from_packet (pkt);
320 else /* INIT, INTF_DOWN */
321 vr->runtime.master_adv_int = vr->config.adv_interval;
323 vrrp_vr_skew_compute (vr);
324 vrrp_vr_master_down_compute (vr);
325 vrrp_vr_timer_set (vr, VRRP_VR_TIMER_MASTER_DOWN);
328 else if (new_state == VRRP_VR_STATE_INIT)
330 /* RFC 5798 sec 6.4.2 (345) - shutdown event for backup VR
331 * sec 6.4.3 (655) - shutdown event for master VR
334 vrrp_vr_timer_cancel (vr);
335 if (vr->runtime.state == VRRP_VR_STATE_MASTER)
336 vrrp_adv_send (vr, 1);
338 else if (new_state == VRRP_VR_STATE_INTF_DOWN)
339 /* State is not specified by RFC. This is to avoid attempting to
340 * send packets on an interface that's down and to avoid having a
341 * VR believe it is already the master when an interface is brought up
343 vrrp_vr_timer_cancel (vr);
345 /* add/delete virtual IP addrs if accept_mode is true */
346 vrrp_vr_transition_addrs (vr, new_state);
348 /* enable/disable input features if necessary */
349 vrrp_vr_transition_intf (vr, new_state);
351 /* add/delete virtual MAC address on NIC if necessary */
352 vrrp_vr_transition_vmac (vr, new_state);
354 vrrp_vr_event (vr, new_state);
356 vr->runtime.state = new_state;
359 #define VRRP4_MCAST_ADDR_AS_U8 { 224, 0, 0, 18 }
360 #define VRRP6_MCAST_ADDR_AS_U8 \
361 { 0xff, 0x2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x12 }
363 static const mfib_prefix_t all_vrrp4_routers = {
364 .fp_proto = FIB_PROTOCOL_IP4,
368 .as_u8 = VRRP4_MCAST_ADDR_AS_U8,
373 static const mfib_prefix_t all_vrrp6_routers = {
374 .fp_proto = FIB_PROTOCOL_IP6,
378 .as_u8 = VRRP6_MCAST_ADDR_AS_U8,
384 vrrp_intf_enable_disable_mcast (u8 enable, u32 sw_if_index, u8 is_ipv6)
386 vrrp_main_t *vrm = &vrrp_main;
391 const mfib_prefix_t *vrrp_prefix;
392 fib_protocol_t proto;
393 vnet_link_t link_type;
394 fib_route_path_t for_us = {
395 .frp_sw_if_index = 0xffffffff,
397 .frp_flags = FIB_ROUTE_PATH_LOCAL,
398 .frp_mitf_flags = MFIB_ITF_FLAG_FORWARD,
400 fib_route_path_t via_itf = {
401 .frp_sw_if_index = sw_if_index,
403 .frp_mitf_flags = MFIB_ITF_FLAG_ACCEPT,
406 intf = vrrp_intf_get (sw_if_index);
410 proto = FIB_PROTOCOL_IP6;
411 link_type = VNET_LINK_IP6;
412 vrrp_prefix = &all_vrrp6_routers;
416 proto = FIB_PROTOCOL_IP4;
417 link_type = VNET_LINK_IP4;
418 vrrp_prefix = &all_vrrp4_routers;
421 for_us.frp_proto = fib_proto_to_dpo (proto);
422 via_itf.frp_proto = fib_proto_to_dpo (proto);
423 fib_index = mfib_table_get_index_for_sw_if_index (proto, sw_if_index);
426 pool_foreach (vr, vrm->vrs,
428 if (vrrp_vr_is_ipv6 (vr) == is_ipv6)
435 /* If this is the first VR configured, add the local mcast routes */
437 mfib_table_entry_path_update (fib_index, vrrp_prefix, MFIB_SOURCE_API,
440 mfib_table_entry_path_update (fib_index, vrrp_prefix, MFIB_SOURCE_API,
442 intf->mcast_adj_index[! !is_ipv6] =
443 adj_mcast_add_or_lock (proto, link_type, sw_if_index);
447 /* Remove mcast local routes if this is the last VR being deleted */
449 mfib_table_entry_path_remove (fib_index, vrrp_prefix, MFIB_SOURCE_API,
452 mfib_table_entry_path_remove (fib_index, vrrp_prefix, MFIB_SOURCE_API,
460 vrrp_intf_vr_add_del (u8 is_add, u32 sw_if_index, u32 vr_index, u8 is_ipv6)
462 vrrp_intf_t *vr_intf;
464 vr_intf = vrrp_intf_get (sw_if_index);
470 if (!vec_len (vr_intf->vr_indices[is_ipv6]))
471 vrrp_intf_enable_disable_mcast (1, sw_if_index, is_ipv6);
473 vec_add1 (vr_intf->vr_indices[is_ipv6], vr_index);
478 vec_search (vr_intf->vr_indices[is_ipv6], vr_index);
480 if (per_intf_index != ~0)
481 vec_del1 (vr_intf->vr_indices[is_ipv6], per_intf_index);
483 /* no more VRs on this interface, disable multicast */
484 if (!vec_len (vr_intf->vr_indices[is_ipv6]))
485 vrrp_intf_enable_disable_mcast (0, sw_if_index, is_ipv6);
491 /* RFC 5798 section 8.3.2 says to take care not to configure more than
492 * one VRRP router as the "IPvX address owner" of a VRID. Make sure that
493 * all of the addresses configured for this VR are configured on the
497 vrrp_vr_valid_addrs_owner (vrrp_vr_config_t * vr_conf)
499 ip46_address_t *addr;
500 u8 is_ipv6 = (vr_conf->flags & VRRP_VR_IPV6) != 0;
502 vec_foreach (addr, vr_conf->vr_addrs)
504 if (!ip_interface_has_address (vr_conf->sw_if_index, addr, !is_ipv6))
505 return VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
512 vrrp_vr_valid_addrs_unused (vrrp_vr_config_t * vr_conf)
514 ip46_address_t *vr_addr;
515 u8 is_ipv6 = (vr_conf->flags & VRRP_VR_IPV6) != 0;
517 vec_foreach (vr_addr, vr_conf->vr_addrs)
522 addr = (is_ipv6) ? (void *) &vr_addr->ip6 : (void *) &vr_addr->ip4;
523 vr_index = vrrp_vr_lookup_address (vr_conf->sw_if_index, is_ipv6, addr);
525 return VNET_API_ERROR_ADDRESS_IN_USE;
532 vrrp_vr_valid_addrs (vrrp_vr_config_t * vr_conf)
536 /* If the VR owns the addresses, make sure they are configured */
537 if (vr_conf->priority == 255 &&
538 (ret = vrrp_vr_valid_addrs_owner (vr_conf)) < 0)
541 /* make sure no other VR has already configured any of the VR addresses */
542 ret = vrrp_vr_valid_addrs_unused (vr_conf);
548 vrrp_vr_addr_add_del (vrrp_vr_t * vr, u8 is_add, ip46_address_t * vr_addr)
550 vrrp_main_t *vmp = &vrrp_main;
552 vrrp4_arp_key_t key4;
554 ip46_address_t *addr;
557 return VNET_API_ERROR_INVALID_ARGUMENT;
559 vr_index = vr - vmp->vrs;
561 if (vrrp_vr_is_ipv6 (vr))
563 key6.sw_if_index = vr->config.sw_if_index;
564 key6.addr = vr_addr->ip6;
567 hash_set_mem_alloc (&vmp->vrrp6_nd_lookup, &key6, vr_index);
568 vec_add1 (vr->config.vr_addrs, vr_addr[0]);
572 hash_unset_mem_free (&vmp->vrrp6_nd_lookup, &key6);
573 vec_foreach (addr, vr->config.vr_addrs)
575 if (!ip46_address_cmp (addr, vr_addr))
577 vec_del1 (vr->config.vr_addrs, vr->config.vr_addrs - addr);
585 key4.sw_if_index = vr->config.sw_if_index;
586 key4.addr = vr_addr->ip4;
589 hash_set (vmp->vrrp4_arp_lookup, key4.as_u64, vr_index);
590 vec_add1 (vr->config.vr_addrs, vr_addr[0]);
594 hash_unset (vmp->vrrp4_arp_lookup, key4.as_u64);
595 vec_foreach (addr, vr->config.vr_addrs)
597 if (!ip46_address_cmp (addr, vr_addr))
599 vec_del1 (vr->config.vr_addrs, vr->config.vr_addrs - addr);
610 vrrp_vr_addrs_add_del (vrrp_vr_t * vr, u8 is_add, ip46_address_t * vr_addrs)
612 ip46_address_t *vr_addr;
614 vec_foreach (vr_addr, vr_addrs)
616 vrrp_vr_addr_add_del (vr, is_add, vr_addr);
620 /* Action function shared between message handler and debug CLI */
622 vrrp_vr_add_del (u8 is_add, vrrp_vr_config_t * vr_conf)
624 vrrp_main_t *vrm = &vrrp_main;
625 vnet_main_t *vnm = vnet_get_main ();
632 if (vr_conf->sw_if_index == ~0 ||
633 !vnet_sw_interface_is_valid (vnm, vr_conf->sw_if_index))
634 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
636 clib_memset (&key, 0, sizeof (key));
638 key.sw_if_index = vr_conf->sw_if_index;
639 key.vr_id = vr_conf->vr_id;
640 key.is_ipv6 = ((vr_conf->flags & VRRP_VR_IPV6) != 0);
642 p = mhash_get (&vrm->vr_index_by_key, &key);
646 /* does a VR matching this key already exist ? */
649 clib_warning ("VR %u for IPv%d already exists on sw_if_index %u",
650 key.vr_id, (key.is_ipv6) ? 6 : 4, key.sw_if_index);
651 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
654 /* were IPvX addresses included ? */
655 if (!vec_len (vr_conf->vr_addrs))
657 clib_warning ("Conf of VR %u for IPv%d on sw_if_index %u "
658 " does not contain IP addresses",
659 key.vr_id, (key.is_ipv6) ? 6 : 4, key.sw_if_index);
660 return VNET_API_ERROR_INVALID_SRC_ADDRESS;
663 /* Make sure the addresses are ok to use */
664 if ((ret = vrrp_vr_valid_addrs (vr_conf)) < 0)
667 pool_get_zero (vrm->vrs, vr);
668 vr_index = vr - vrm->vrs;
670 clib_memcpy (&vr->config, vr_conf, sizeof (vrrp_vr_config_t));
672 vr->config.vr_addrs = 0; /* allocate our own memory */
673 vrrp_vr_addrs_add_del (vr, is_add, vr_conf->vr_addrs);
675 vr->runtime.state = VRRP_VR_STATE_INIT;
676 vr->runtime.timer_index = ~0;
678 /* set virtual MAC based on IP version and VR ID */
679 vr->runtime.mac = (key.is_ipv6) ? ipv6_vmac : ipv4_vmac;
680 vr->runtime.mac.bytes[5] = vr_conf->vr_id;
682 mhash_set (&vrm->vr_index_by_key, &key, vr_index, 0);
688 clib_warning ("No VR %u for IPv%d exists on sw_if_index %u",
689 key.vr_id, (key.is_ipv6) ? 6 : 4, key.sw_if_index);
690 return VNET_API_ERROR_NO_SUCH_ENTRY;
694 vr = pool_elt_at_index (vrm->vrs, vr_index);
696 vrrp_vr_tracking_ifs_add_del (vr, vr->tracking.interfaces, is_add);
697 vrrp_vr_addrs_add_del (vr, is_add, vr->config.vr_addrs);
698 mhash_unset (&vrm->vr_index_by_key, &key, 0);
699 vec_free (vr->config.vr_addrs);
700 vec_free (vr->tracking.interfaces);
701 pool_put (vrm->vrs, vr);
704 vrrp_intf_vr_add_del (is_add, vr_conf->sw_if_index, vr_index, key.is_ipv6);
710 vrrp_vr_start_stop (u8 is_start, vrrp_vr_key_t * vr_key)
712 vrrp_main_t *vmp = &vrrp_main;
716 p = mhash_get (&vmp->vr_index_by_key, vr_key);
718 return VNET_API_ERROR_NO_SUCH_ENTRY;
720 vr = pool_elt_at_index (vmp->vrs, p[0]);
722 /* return success if already in the desired state */
723 switch (vr->runtime.state)
725 case VRRP_VR_STATE_INIT:
728 clib_warning ("Attempting to stop already stopped VR (%U)",
729 format_vrrp_vr_key, vr);
736 clib_warning ("Attempting to start already started VR (%U)",
737 format_vrrp_vr_key, vr);
745 if (vrrp_vr_is_unicast (vr) && vec_len (vr->config.peer_addrs) == 0)
747 clib_warning ("Cannot start unicast VR without peers");
748 return VNET_API_ERROR_INIT_FAILED;
751 vmp->n_vrs_started++;
753 if (!vrrp_intf_is_up (vr->config.sw_if_index, vrrp_vr_is_ipv6 (vr),
756 clib_warning ("VRRP VR started on down interface (%U)",
757 format_vrrp_vr_key, vr);
758 vrrp_vr_transition (vr, VRRP_VR_STATE_INTF_DOWN, NULL);
760 else if (vrrp_vr_is_owner (vr))
761 vrrp_vr_transition (vr, VRRP_VR_STATE_MASTER, NULL);
763 vrrp_vr_transition (vr, VRRP_VR_STATE_BACKUP, NULL);
767 vmp->n_vrs_started--;
769 vrrp_vr_transition (vr, VRRP_VR_STATE_INIT, NULL);
772 clib_warning ("%d VRs configured, %d VRs running",
773 pool_elts (vmp->vrs), vmp->n_vrs_started);
779 vrrp_vr_set_peers_validate (vrrp_vr_t * vr, ip46_address_t * peers)
781 if (!vrrp_vr_is_unicast (vr))
783 clib_warning ("Peers can only be set on a unicast VR");
784 return VNET_API_ERROR_INVALID_ARGUMENT;
787 if (vr->runtime.state != VRRP_VR_STATE_INIT)
789 clib_warning ("Cannot set peers on a running VR");
790 return VNET_API_ERROR_RSRC_IN_USE;
793 if (vec_len (peers) == 0)
795 clib_warning ("No peer addresses provided");
796 return VNET_API_ERROR_INVALID_DST_ADDRESS;
803 vrrp_vr_set_peers (vrrp_vr_key_t * vr_key, ip46_address_t * peers)
805 vrrp_main_t *vmp = &vrrp_main;
810 p = mhash_get (&vmp->vr_index_by_key, vr_key);
812 return VNET_API_ERROR_NO_SUCH_ENTRY;
814 vr = pool_elt_at_index (vmp->vrs, p[0]);
816 ret = vrrp_vr_set_peers_validate (vr, peers);
820 if (vr->config.peer_addrs)
821 vec_free (vr->config.peer_addrs);
823 vr->config.peer_addrs = vec_dup (peers);
828 /* Manage reference on the interface to the VRs which track that interface */
830 vrrp_intf_tracking_vr_add_del (u32 sw_if_index, vrrp_vr_t * vr, u8 is_add)
834 u8 is_ipv6 = vrrp_vr_is_ipv6 (vr);
837 intf = vrrp_intf_get (sw_if_index);
838 vr_index = vrrp_vr_index (vr);
840 /* Try to find the VR index in the list of tracking VRs */
841 vec_foreach_index (i, intf->tracking_vrs[is_ipv6])
843 if (vec_elt (intf->tracking_vrs[is_ipv6], i) != vr_index)
846 /* Current index matches VR index */
848 vec_delete (intf->tracking_vrs[is_ipv6], 1, i);
850 /* If deleting, the job is done. If adding, it's already here */
854 /* vr index was not found. */
856 vec_add1 (intf->tracking_vrs[is_ipv6], vr_index);
859 /* Check if sw intf admin state is up or in the process of coming up */
861 vrrp_intf_sw_admin_up (u32 sw_if_index, vrrp_intf_update_t * pending)
863 vnet_main_t *vnm = vnet_get_main ();
866 if (pending && (pending->type == VRRP_IF_UPDATE_SW_ADMIN))
867 admin_up = pending->intf_up;
869 admin_up = vnet_sw_interface_is_admin_up (vnm, sw_if_index);
874 /* Check if hw intf link state is up or int the process of coming up */
876 vrrp_intf_hw_link_up (u32 sw_if_index, vrrp_intf_update_t * pending)
878 vnet_main_t *vnm = vnet_get_main ();
879 vnet_sw_interface_t *sup_sw;
882 sup_sw = vnet_get_sup_sw_interface (vnm, sw_if_index);
884 if (pending && (pending->type == VRRP_IF_UPDATE_HW_LINK) &&
885 (pending->hw_if_index == sup_sw->hw_if_index))
886 link_up = pending->intf_up;
888 link_up = vnet_hw_interface_is_link_up (vnm, sup_sw->hw_if_index);
893 /* Check if interface has ability to send IP packets. */
895 vrrp_intf_ip_up (u32 sw_if_index, u8 is_ipv6, vrrp_intf_update_t * pending)
899 if (pending && pending->type == VRRP_IF_UPDATE_IP)
900 ip_up = pending->intf_up;
902 /* Either a unicast address has to be explicitly assigned, or
903 * for IPv6 only, a link local assigned and multicast/ND enabled
906 ((ip_interface_get_first_ip (sw_if_index, !is_ipv6) != 0) ||
907 (is_ipv6 && ip6_link_is_enabled (sw_if_index)));
913 vrrp_intf_is_up (u32 sw_if_index, u8 is_ipv6, vrrp_intf_update_t * pending)
915 int admin_up, link_up, ip_up;
917 admin_up = vrrp_intf_sw_admin_up (sw_if_index, pending);
918 link_up = vrrp_intf_hw_link_up (sw_if_index, pending);
919 ip_up = vrrp_intf_ip_up (sw_if_index, is_ipv6, pending);
921 return (admin_up && link_up && ip_up);
924 /* Examine the state of interfaces tracked by a VR and compute the priority
925 * adjustment that should be applied to the VR. If this is being called
926 * by the hw_link_up_down callback, the pending new flags on the sup hw
927 * interface have not been updated yet, so accept those as an optional
931 vrrp_vr_tracking_ifs_compute (vrrp_vr_t * vr, vrrp_intf_update_t * pending)
933 vrrp_vr_tracking_if_t *intf;
934 u32 total_priority = 0;
936 vec_foreach (intf, vr->tracking.interfaces)
938 if (vrrp_intf_is_up (intf->sw_if_index, vrrp_vr_is_ipv6 (vr), pending))
941 total_priority += intf->priority;
944 if (total_priority != vr->tracking.interfaces_dec)
946 clib_warning ("VR %U interface track adjustment change from %u to %u",
947 format_vrrp_vr_key, vr, vr->tracking.interfaces_dec,
949 vr->tracking.interfaces_dec = total_priority;
953 /* Manage tracked interfaces on a VR */
955 vrrp_vr_tracking_if_add_del (vrrp_vr_t * vr, u32 sw_if_index, u8 prio,
958 vnet_main_t *vnm = vnet_get_main ();
959 vrrp_vr_tracking_if_t *track_intf;
961 /* VR can't track non-existent interface */
962 if (!vnet_sw_interface_is_valid (vnm, sw_if_index))
963 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
965 /* VR can't track it's own interface */
966 if (sw_if_index == vr->config.sw_if_index)
967 return VNET_API_ERROR_INVALID_SW_IF_INDEX_2;
969 /* update intf vector of tracking VRs */
970 vrrp_intf_tracking_vr_add_del (sw_if_index, vr, is_add);
972 /* update VR vector of tracked interfaces */
973 vec_foreach (track_intf, vr->tracking.interfaces)
975 if (track_intf->sw_if_index != sw_if_index)
981 (vr->tracking.interfaces, 1, track_intf - vr->tracking.interfaces);
988 vec_add2 (vr->tracking.interfaces, track_intf, 1);
990 track_intf->sw_if_index = sw_if_index;
991 track_intf->priority = prio;
998 vrrp_vr_tracking_ifs_add_del (vrrp_vr_t * vr,
999 vrrp_vr_tracking_if_t * track_ifs, u8 is_add)
1001 vrrp_vr_tracking_if_t *track_if, *ifs_copy;
1004 /* if deleting & track_ifs points to the VR list of tracked intfs, the
1005 * vector could be modified as we iterate it. make a copy instead */
1006 ifs_copy = vec_dup (track_ifs);
1008 /* add each tracked interface in the vector */
1009 vec_foreach (track_if, ifs_copy)
1011 rv = vrrp_vr_tracking_if_add_del (vr, track_if->sw_if_index,
1012 track_if->priority, (is_add != 0));
1014 /* if operation failed, undo the previous changes */
1017 vrrp_vr_tracking_if_t *rb_if;
1019 for (rb_if = track_if - 1; rb_if >= track_ifs; rb_if -= 1)
1020 vrrp_vr_tracking_if_add_del (vr, rb_if->sw_if_index,
1021 rb_if->priority, !(is_add != 0));
1026 vec_free (ifs_copy);
1028 vrrp_vr_tracking_ifs_compute (vr, 0);
1033 /* Compute priority to advertise on all VRs which track the given interface
1034 * and address family. The flags on an HW interface are not updated until
1035 * after link up/down callbacks are invoked, so if this function is called
1036 * by the link up/down callback, the flags about to be set will be passed
1037 * via the 'pending' argument. Otherwise, pending will be NULL.
1040 vrrp_intf_tracking_vrs_compute (u32 sw_if_index,
1041 vrrp_intf_update_t * pending, u8 is_ipv6)
1045 vrrp_intf_t *intf = vrrp_intf_get (sw_if_index);
1047 vec_foreach (vr_index, intf->tracking_vrs[is_ipv6])
1049 vr = vrrp_vr_lookup_index (*vr_index);
1051 vrrp_vr_tracking_ifs_compute (vr, pending);
1055 /* Interface being brought up/down is a quasi-{startup/shutdown} event.
1056 * Execute an appropriate state transition for all VRs on the interface.
1057 * This function may be invoked by:
1058 * sw interface admin up/down event
1059 * hw interface link up/down event
1062 vrrp_sw_interface_up_down (vrrp_intf_update_t * pending)
1069 intf = vrrp_intf_get (pending->sw_if_index);
1073 /* adjust state of VR's configured on this interface */
1074 for (i = 0; i < 2; i++)
1078 if (!intf->vr_indices[i])
1081 is_up = vrrp_intf_is_up (pending->sw_if_index, i, pending);
1083 vec_foreach (vr_index, intf->vr_indices[i])
1085 vrrp_vr_state_t vr_state;
1087 vr = vrrp_vr_lookup_index (*vr_index);
1091 if (vr->runtime.state == VRRP_VR_STATE_INIT)
1092 continue; /* VR not started yet, no transition */
1095 vr_state = VRRP_VR_STATE_INTF_DOWN;
1098 if (vr->runtime.state != VRRP_VR_STATE_INTF_DOWN)
1099 continue; /* shouldn't happen */
1101 vr_state = (vrrp_vr_is_owner (vr)) ?
1102 VRRP_VR_STATE_MASTER : VRRP_VR_STATE_BACKUP;
1105 vrrp_vr_transition (vr, vr_state, NULL);
1109 /* compute adjustments on any VR's tracking this interface */
1110 vrrp_intf_tracking_vrs_compute (pending->sw_if_index, pending,
1112 vrrp_intf_tracking_vrs_compute (pending->sw_if_index, pending,
1118 /* Process change in admin status on an interface */
1120 vrrp_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index,
1123 vrrp_intf_update_t pending = {
1124 .type = VRRP_IF_UPDATE_SW_ADMIN,
1125 .sw_if_index = sw_if_index,
1126 .intf_up = ((flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0),
1129 return vrrp_sw_interface_up_down (&pending);
1132 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (vrrp_sw_interface_admin_up_down);
1135 vrrp_hw_interface_link_up_down_walk (vnet_main_t * vnm,
1136 u32 sw_if_index, void *arg)
1138 vrrp_intf_update_t *pending = arg;
1140 pending->sw_if_index = sw_if_index;
1141 vrrp_sw_interface_up_down (pending);
1143 return WALK_CONTINUE;
1146 static clib_error_t *
1147 vrrp_hw_interface_link_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
1149 vrrp_intf_update_t pending = {
1150 .type = VRRP_IF_UPDATE_HW_LINK,
1151 .hw_if_index = hw_if_index,
1152 .intf_up = ((flags & VNET_HW_INTERFACE_FLAG_LINK_UP) != 0),
1155 /* walk the sw interface and sub interfaces to adjust interface tracking */
1156 vnet_hw_interface_walk_sw (vnm, hw_if_index,
1157 vrrp_hw_interface_link_up_down_walk, &pending);
1162 VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION (vrrp_hw_interface_link_up_down);
1165 vrrp_ip4_add_del_interface_addr (ip4_main_t * im,
1168 ip4_address_t * address,
1170 u32 if_address_index, u32 is_del)
1172 vrrp_intf_tracking_vrs_compute (sw_if_index, NULL, 0 /* is_ipv6 */ );
1175 static ip6_link_delegate_id_t vrrp_ip6_delegate_id;
1178 format_vrrp_ip6_link (u8 * s, va_list * args)
1180 index_t indi = va_arg (*args, index_t);
1181 u32 indent = va_arg (*args, u32);
1185 intf = vrrp_intf_get ((u32) indi);
1187 s = format (s, "%UVRRP VRs monitoring this link:\n",
1188 format_white_space, indent);
1190 vec_foreach (vr_index, intf->tracking_vrs[1])
1192 vrrp_vr_t *vr = vrrp_vr_lookup_index (*vr_index);
1194 s = format (s, "%U%U\n", format_white_space, indent + 2,
1195 format_vrrp_vr_key, vr);
1202 vrrp_intf_ip6_enable_disable (u32 sw_if_index, int enable)
1204 vrrp_intf_update_t pending = {
1205 .type = VRRP_IF_UPDATE_IP,
1206 .sw_if_index = sw_if_index,
1210 vrrp_intf_tracking_vrs_compute (sw_if_index, &pending, 1 /* is_ipv6 */ );
1214 vrrp_intf_ip6_enable (u32 sw_if_index)
1216 vrrp_intf_ip6_enable_disable (sw_if_index, 1 /* enable */ );
1217 ip6_link_delegate_update (sw_if_index, vrrp_ip6_delegate_id, sw_if_index);
1221 vrrp_intf_ip6_disable (index_t indi)
1223 vrrp_intf_ip6_enable_disable (indi, 0 /* enable */ );
1226 const static ip6_link_delegate_vft_t vrrp_ip6_delegate_vft = {
1227 .ildv_enable = vrrp_intf_ip6_enable,
1228 .ildv_disable = vrrp_intf_ip6_disable,
1229 .ildv_format = format_vrrp_ip6_link,
1232 static clib_error_t *
1233 vrrp_init (vlib_main_t * vm)
1235 vrrp_main_t *vmp = &vrrp_main;
1236 clib_error_t *error = 0;
1237 ip4_main_t *im4 = &ip4_main;
1238 ip4_add_del_interface_address_callback_t cb4;
1239 vlib_node_t *intf_output_node;
1241 clib_memset (vmp, 0, sizeof (*vmp));
1243 if ((error = vlib_call_init_function (vm, ip4_lookup_init)) ||
1244 (error = vlib_call_init_function (vm, ip6_lookup_init)))
1247 vmp->vlib_main = vm;
1248 vmp->vnet_main = vnet_get_main ();
1250 intf_output_node = vlib_get_node_by_name (vm, (u8 *) "interface-output");
1251 vmp->intf_output_node_idx = intf_output_node->index;
1253 error = vrrp_plugin_api_hookup (vm);
1258 mhash_init (&vmp->vr_index_by_key, sizeof (u32), sizeof (vrrp_vr_key_t));
1259 vmp->vrrp4_arp_lookup = hash_create (0, sizeof (uword));
1260 vmp->vrrp6_nd_lookup = hash_create_mem (0, sizeof (vrrp6_nd_key_t),
1263 cb4.function = vrrp_ip4_add_del_interface_addr;
1264 cb4.function_opaque = 0;
1265 vec_add1 (im4->add_del_interface_address_callbacks, cb4);
1267 vrrp_ip6_delegate_id = ip6_link_delegate_register (&vrrp_ip6_delegate_vft);
1272 VLIB_INIT_FUNCTION (vrrp_init);
1276 VLIB_PLUGIN_REGISTER () =
1278 .version = VPP_BUILD_VER,
1279 .description = "VRRP v3 (RFC 5798)",
1284 * fd.io coding-style-patch-verification: ON
1287 * eval: (c-set-style "gnu")