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-rw-r--r--pimd/pim_neighbor.c794
1 files changed, 794 insertions, 0 deletions
diff --git a/pimd/pim_neighbor.c b/pimd/pim_neighbor.c
new file mode 100644
index 0000000..b941eae
--- /dev/null
+++ b/pimd/pim_neighbor.c
@@ -0,0 +1,794 @@
+/*
+ * PIM for Quagga
+ * Copyright (C) 2008 Everton da Silva Marques
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <zebra.h>
+
+#include "log.h"
+#include "prefix.h"
+#include "memory.h"
+#include "if.h"
+#include "vty.h"
+#include "plist.h"
+#include "lib_errors.h"
+
+#include "pimd.h"
+#include "pim_instance.h"
+#include "pim_neighbor.h"
+#include "pim_time.h"
+#include "pim_str.h"
+#include "pim_iface.h"
+#include "pim_pim.h"
+#include "pim_upstream.h"
+#include "pim_ifchannel.h"
+#include "pim_rp.h"
+#include "pim_zebra.h"
+#include "pim_join.h"
+#include "pim_jp_agg.h"
+#include "pim_bfd.h"
+#include "pim_register.h"
+#include "pim_oil.h"
+
+static void dr_election_by_addr(struct interface *ifp)
+{
+ struct pim_interface *pim_ifp;
+ struct listnode *node;
+ struct pim_neighbor *neigh;
+
+ pim_ifp = ifp->info;
+ assert(pim_ifp);
+
+ pim_ifp->pim_dr_addr = pim_ifp->primary_address;
+
+ if (PIM_DEBUG_PIM_TRACE) {
+ zlog_debug("%s: on interface %s", __func__, ifp->name);
+ }
+
+ for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) {
+ if (pim_addr_cmp(neigh->source_addr, pim_ifp->pim_dr_addr) > 0)
+ pim_ifp->pim_dr_addr = neigh->source_addr;
+ }
+}
+
+static void dr_election_by_pri(struct interface *ifp)
+{
+ struct pim_interface *pim_ifp;
+ struct listnode *node;
+ struct pim_neighbor *neigh;
+ uint32_t dr_pri;
+
+ pim_ifp = ifp->info;
+ assert(pim_ifp);
+
+ pim_ifp->pim_dr_addr = pim_ifp->primary_address;
+ dr_pri = pim_ifp->pim_dr_priority;
+
+ if (PIM_DEBUG_PIM_TRACE) {
+ zlog_debug("%s: dr pri %u on interface %s", __func__, dr_pri,
+ ifp->name);
+ }
+
+ for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) {
+ if (PIM_DEBUG_PIM_TRACE) {
+ zlog_info("%s: neigh pri %u addr %pPA if dr addr %pPA",
+ __func__, neigh->dr_priority,
+ &neigh->source_addr, &pim_ifp->pim_dr_addr);
+ }
+ if ((neigh->dr_priority > dr_pri) ||
+ ((neigh->dr_priority == dr_pri) &&
+ (pim_addr_cmp(neigh->source_addr, pim_ifp->pim_dr_addr) >
+ 0))) {
+ pim_ifp->pim_dr_addr = neigh->source_addr;
+ dr_pri = neigh->dr_priority;
+ }
+ }
+}
+
+/*
+ RFC 4601: 4.3.2. DR Election
+
+ A router's idea of the current DR on an interface can change when a
+ PIM Hello message is received, when a neighbor times out, or when a
+ router's own DR Priority changes.
+ */
+int pim_if_dr_election(struct interface *ifp)
+{
+ struct pim_interface *pim_ifp = ifp->info;
+ pim_addr old_dr_addr;
+
+ ++pim_ifp->pim_dr_election_count;
+
+ old_dr_addr = pim_ifp->pim_dr_addr;
+
+ if (pim_ifp->pim_dr_num_nondrpri_neighbors) {
+ dr_election_by_addr(ifp);
+ } else {
+ dr_election_by_pri(ifp);
+ }
+
+ /* DR changed ? */
+ if (pim_addr_cmp(old_dr_addr, pim_ifp->pim_dr_addr)) {
+
+ if (PIM_DEBUG_PIM_EVENTS)
+ zlog_debug(
+ "%s: DR was %pPA now is %pPA on interface %s",
+ __func__, &old_dr_addr, &pim_ifp->pim_dr_addr,
+ ifp->name);
+
+ pim_ifp->pim_dr_election_last =
+ pim_time_monotonic_sec(); /* timestamp */
+ ++pim_ifp->pim_dr_election_changes;
+ pim_if_update_join_desired(pim_ifp);
+ pim_if_update_could_assert(ifp);
+ pim_if_update_assert_tracking_desired(ifp);
+
+ if (PIM_I_am_DR(pim_ifp)) {
+ pim_ifp->am_i_dr = true;
+ pim_clear_nocache_state(pim_ifp);
+ } else {
+ if (pim_ifp->am_i_dr == true) {
+ pim_reg_del_on_couldreg_fail(ifp);
+ pim_ifp->am_i_dr = false;
+ }
+ }
+
+ return 1;
+ }
+
+ return 0;
+}
+
+static void update_dr_priority(struct pim_neighbor *neigh,
+ pim_hello_options hello_options,
+ uint32_t dr_priority)
+{
+ pim_hello_options will_set_pri; /* boolean */
+ pim_hello_options bit_flip; /* boolean */
+ pim_hello_options pri_change; /* boolean */
+
+ will_set_pri =
+ PIM_OPTION_IS_SET(hello_options, PIM_OPTION_MASK_DR_PRIORITY);
+
+ bit_flip = (will_set_pri
+ != PIM_OPTION_IS_SET(neigh->hello_options,
+ PIM_OPTION_MASK_DR_PRIORITY));
+
+ if (bit_flip) {
+ struct pim_interface *pim_ifp = neigh->interface->info;
+
+ /* update num. of neighbors without dr_pri */
+
+ if (will_set_pri) {
+ --pim_ifp->pim_dr_num_nondrpri_neighbors;
+ } else {
+ ++pim_ifp->pim_dr_num_nondrpri_neighbors;
+ }
+ }
+
+ pri_change = (bit_flip || (neigh->dr_priority != dr_priority));
+
+ if (will_set_pri) {
+ neigh->dr_priority = dr_priority;
+ } else {
+ neigh->dr_priority = 0; /* cosmetic unset */
+ }
+
+ if (pri_change) {
+ /*
+ RFC 4601: 4.3.2. DR Election
+
+ A router's idea of the current DR on an interface can change
+ when a
+ PIM Hello message is received, when a neighbor times out, or
+ when a
+ router's own DR Priority changes.
+ */
+ pim_if_dr_election(
+ neigh->interface); // router's own DR Priority changes
+ }
+}
+
+static void on_neighbor_timer(struct thread *t)
+{
+ struct pim_neighbor *neigh;
+ struct interface *ifp;
+ char msg[100];
+
+ neigh = THREAD_ARG(t);
+
+ ifp = neigh->interface;
+
+ if (PIM_DEBUG_PIM_TRACE)
+ zlog_debug(
+ "Expired %d sec holdtime for neighbor %pPA on interface %s",
+ neigh->holdtime, &neigh->source_addr, ifp->name);
+
+ snprintf(msg, sizeof(msg), "%d-sec holdtime expired", neigh->holdtime);
+ pim_neighbor_delete(ifp, neigh, msg);
+
+ /*
+ RFC 4601: 4.3.2. DR Election
+
+ A router's idea of the current DR on an interface can change when a
+ PIM Hello message is received, when a neighbor times out, or when a
+ router's own DR Priority changes.
+ */
+ pim_if_dr_election(ifp); // neighbor times out
+}
+
+void pim_neighbor_timer_reset(struct pim_neighbor *neigh, uint16_t holdtime)
+{
+ neigh->holdtime = holdtime;
+
+ THREAD_OFF(neigh->t_expire_timer);
+
+ /*
+ 0xFFFF is request for no holdtime
+ */
+ if (neigh->holdtime == 0xFFFF) {
+ return;
+ }
+
+ if (PIM_DEBUG_PIM_TRACE_DETAIL)
+ zlog_debug("%s: starting %u sec timer for neighbor %pPA on %s",
+ __func__, neigh->holdtime, &neigh->source_addr,
+ neigh->interface->name);
+
+ thread_add_timer(router->master, on_neighbor_timer, neigh,
+ neigh->holdtime, &neigh->t_expire_timer);
+}
+
+static void on_neighbor_jp_timer(struct thread *t)
+{
+ struct pim_neighbor *neigh = THREAD_ARG(t);
+ struct pim_rpf rpf;
+
+ if (PIM_DEBUG_PIM_TRACE)
+ zlog_debug("%s:Sending JP Agg to %pPA on %s with %d groups",
+ __func__, &neigh->source_addr,
+ neigh->interface->name,
+ neigh->upstream_jp_agg->count);
+
+ rpf.source_nexthop.interface = neigh->interface;
+ rpf.rpf_addr = neigh->source_addr;
+ pim_joinprune_send(&rpf, neigh->upstream_jp_agg);
+
+ thread_add_timer(router->master, on_neighbor_jp_timer, neigh,
+ router->t_periodic, &neigh->jp_timer);
+}
+
+static void pim_neighbor_start_jp_timer(struct pim_neighbor *neigh)
+{
+ THREAD_OFF(neigh->jp_timer);
+ thread_add_timer(router->master, on_neighbor_jp_timer, neigh,
+ router->t_periodic, &neigh->jp_timer);
+}
+
+static struct pim_neighbor *
+pim_neighbor_new(struct interface *ifp, pim_addr source_addr,
+ pim_hello_options hello_options, uint16_t holdtime,
+ uint16_t propagation_delay, uint16_t override_interval,
+ uint32_t dr_priority, uint32_t generation_id,
+ struct list *addr_list)
+{
+ struct pim_interface *pim_ifp;
+ struct pim_neighbor *neigh;
+
+ assert(ifp);
+ pim_ifp = ifp->info;
+ assert(pim_ifp);
+
+ neigh = XCALLOC(MTYPE_PIM_NEIGHBOR, sizeof(*neigh));
+
+ neigh->creation = pim_time_monotonic_sec();
+ neigh->source_addr = source_addr;
+ neigh->hello_options = hello_options;
+ neigh->propagation_delay_msec = propagation_delay;
+ neigh->override_interval_msec = override_interval;
+ neigh->dr_priority = dr_priority;
+ neigh->generation_id = generation_id;
+ neigh->prefix_list = addr_list;
+ neigh->t_expire_timer = NULL;
+ neigh->interface = ifp;
+
+ neigh->upstream_jp_agg = list_new();
+ neigh->upstream_jp_agg->cmp = pim_jp_agg_group_list_cmp;
+ neigh->upstream_jp_agg->del =
+ (void (*)(void *))pim_jp_agg_group_list_free;
+ pim_neighbor_start_jp_timer(neigh);
+
+ pim_neighbor_timer_reset(neigh, holdtime);
+ /*
+ * The pim_ifstat_hello_sent variable is used to decide if
+ * we should expedite a hello out the interface. If we
+ * establish a new neighbor, we unfortunately need to
+ * reset the value so that we can know to hurry up and
+ * hello
+ */
+ PIM_IF_FLAG_UNSET_HELLO_SENT(pim_ifp->flags);
+
+ if (PIM_DEBUG_PIM_EVENTS)
+ zlog_debug("%s: creating PIM neighbor %pPA on interface %s",
+ __func__, &source_addr, ifp->name);
+
+ zlog_notice("PIM NEIGHBOR UP: neighbor %pPA on interface %s",
+ &source_addr, ifp->name);
+
+ if (neigh->propagation_delay_msec
+ > pim_ifp->pim_neighbors_highest_propagation_delay_msec) {
+ pim_ifp->pim_neighbors_highest_propagation_delay_msec =
+ neigh->propagation_delay_msec;
+ }
+ if (neigh->override_interval_msec
+ > pim_ifp->pim_neighbors_highest_override_interval_msec) {
+ pim_ifp->pim_neighbors_highest_override_interval_msec =
+ neigh->override_interval_msec;
+ }
+
+ if (!PIM_OPTION_IS_SET(neigh->hello_options,
+ PIM_OPTION_MASK_LAN_PRUNE_DELAY)) {
+ /* update num. of neighbors without hello option lan_delay */
+ ++pim_ifp->pim_number_of_nonlandelay_neighbors;
+ }
+
+ if (!PIM_OPTION_IS_SET(neigh->hello_options,
+ PIM_OPTION_MASK_DR_PRIORITY)) {
+ /* update num. of neighbors without hello option dr_pri */
+ ++pim_ifp->pim_dr_num_nondrpri_neighbors;
+ }
+
+ // Register PIM Neighbor with BFD
+ pim_bfd_info_nbr_create(pim_ifp, neigh);
+
+ return neigh;
+}
+
+static void delete_prefix_list(struct pim_neighbor *neigh)
+{
+ if (neigh->prefix_list) {
+
+#ifdef DUMP_PREFIX_LIST
+ struct listnode *p_node;
+ struct prefix *p;
+ int list_size = neigh->prefix_list
+ ? (int)listcount(neigh->prefix_list)
+ : -1;
+ int i = 0;
+ for (ALL_LIST_ELEMENTS_RO(neigh->prefix_list, p_node, p)) {
+ zlog_debug(
+ "%s: DUMP_PREFIX_LIST neigh=%x prefix_list=%x prefix=%x addr=%pFXh [%d/%d]",
+ __func__, (unsigned)neigh,
+ (unsigned)neigh->prefix_list, (unsigned)p, p, i,
+ list_size);
+ ++i;
+ }
+#endif
+
+ list_delete(&neigh->prefix_list);
+ }
+}
+
+void pim_neighbor_free(struct pim_neighbor *neigh)
+{
+ assert(!neigh->t_expire_timer);
+
+ delete_prefix_list(neigh);
+
+ list_delete(&neigh->upstream_jp_agg);
+ THREAD_OFF(neigh->jp_timer);
+
+ bfd_sess_free(&neigh->bfd_session);
+
+ XFREE(MTYPE_PIM_NEIGHBOR, neigh);
+}
+
+struct pim_neighbor *pim_neighbor_find_by_secondary(struct interface *ifp,
+ struct prefix *src)
+{
+ struct pim_interface *pim_ifp;
+ struct listnode *node, *pnode;
+ struct pim_neighbor *neigh;
+ struct prefix *p;
+
+ if (!ifp || !ifp->info)
+ return NULL;
+
+ pim_ifp = ifp->info;
+
+ for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) {
+ for (ALL_LIST_ELEMENTS_RO(neigh->prefix_list, pnode, p)) {
+ if (prefix_same(p, src))
+ return neigh;
+ }
+ }
+
+ return NULL;
+}
+
+struct pim_neighbor *pim_neighbor_find(struct interface *ifp,
+ pim_addr source_addr)
+{
+ struct pim_interface *pim_ifp;
+ struct listnode *node;
+ struct pim_neighbor *neigh;
+
+ if (!ifp)
+ return NULL;
+
+ pim_ifp = ifp->info;
+ if (!pim_ifp)
+ return NULL;
+
+ for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) {
+ if (!pim_addr_cmp(source_addr, neigh->source_addr)) {
+ return neigh;
+ }
+ }
+
+ return NULL;
+}
+
+/*
+ * Find the *one* interface out
+ * this interface. If more than
+ * one return NULL
+ */
+struct pim_neighbor *pim_neighbor_find_if(struct interface *ifp)
+{
+ struct pim_interface *pim_ifp = ifp->info;
+
+ if (!pim_ifp || pim_ifp->pim_neighbor_list->count != 1)
+ return NULL;
+
+ return listnode_head(pim_ifp->pim_neighbor_list);
+}
+
+struct pim_neighbor *
+pim_neighbor_add(struct interface *ifp, pim_addr source_addr,
+ pim_hello_options hello_options, uint16_t holdtime,
+ uint16_t propagation_delay, uint16_t override_interval,
+ uint32_t dr_priority, uint32_t generation_id,
+ struct list *addr_list, int send_hello_now)
+{
+ struct pim_interface *pim_ifp;
+ struct pim_neighbor *neigh;
+
+ neigh = pim_neighbor_new(ifp, source_addr, hello_options, holdtime,
+ propagation_delay, override_interval,
+ dr_priority, generation_id, addr_list);
+ if (!neigh) {
+ return 0;
+ }
+
+ pim_ifp = ifp->info;
+ assert(pim_ifp);
+
+ listnode_add(pim_ifp->pim_neighbor_list, neigh);
+
+ if (PIM_DEBUG_PIM_TRACE_DETAIL)
+ zlog_debug("%s: neighbor %pPA added ", __func__, &source_addr);
+ /*
+ RFC 4601: 4.3.2. DR Election
+
+ A router's idea of the current DR on an interface can change when a
+ PIM Hello message is received, when a neighbor times out, or when a
+ router's own DR Priority changes.
+ */
+ pim_if_dr_election(neigh->interface); // new neighbor -- should not
+ // trigger dr election...
+
+ /*
+ RFC 4601: 4.3.1. Sending Hello Messages
+
+ To allow new or rebooting routers to learn of PIM neighbors quickly,
+ when a Hello message is received from a new neighbor, or a Hello
+ message with a new GenID is received from an existing neighbor, a
+ new Hello message should be sent on this interface after a
+ randomized delay between 0 and Triggered_Hello_Delay.
+
+ This is a bit silly to do it that way. If I get a new
+ genid we need to send the hello *now* because we've
+ lined up a bunch of join/prune messages to go out the
+ interface.
+ */
+ if (send_hello_now)
+ pim_hello_restart_now(ifp);
+ else
+ pim_hello_restart_triggered(neigh->interface);
+
+ pim_upstream_find_new_rpf(pim_ifp->pim);
+
+ /* RNH can send nexthop update prior to PIM neibhor UP
+ in that case nexthop cache would not consider this neighbor
+ as RPF.
+ Upon PIM neighbor UP, iterate all RPs and update
+ nexthop cache with this neighbor.
+ */
+ pim_resolve_rp_nh(pim_ifp->pim, neigh);
+
+ pim_rp_setup(pim_ifp->pim);
+
+ sched_rpf_cache_refresh(pim_ifp->pim);
+ return neigh;
+}
+
+static uint16_t find_neighbors_next_highest_propagation_delay_msec(
+ struct interface *ifp, struct pim_neighbor *highest_neigh)
+{
+ struct pim_interface *pim_ifp;
+ struct listnode *neigh_node;
+ struct pim_neighbor *neigh;
+ uint16_t next_highest_delay_msec;
+
+ pim_ifp = ifp->info;
+ assert(pim_ifp);
+
+ next_highest_delay_msec = pim_ifp->pim_propagation_delay_msec;
+
+ for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, neigh_node,
+ neigh)) {
+ if (neigh == highest_neigh)
+ continue;
+ if (neigh->propagation_delay_msec > next_highest_delay_msec)
+ next_highest_delay_msec = neigh->propagation_delay_msec;
+ }
+
+ return next_highest_delay_msec;
+}
+
+static uint16_t find_neighbors_next_highest_override_interval_msec(
+ struct interface *ifp, struct pim_neighbor *highest_neigh)
+{
+ struct pim_interface *pim_ifp;
+ struct listnode *neigh_node;
+ struct pim_neighbor *neigh;
+ uint16_t next_highest_interval_msec;
+
+ pim_ifp = ifp->info;
+ assert(pim_ifp);
+
+ next_highest_interval_msec = pim_ifp->pim_override_interval_msec;
+
+ for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, neigh_node,
+ neigh)) {
+ if (neigh == highest_neigh)
+ continue;
+ if (neigh->override_interval_msec > next_highest_interval_msec)
+ next_highest_interval_msec =
+ neigh->override_interval_msec;
+ }
+
+ return next_highest_interval_msec;
+}
+
+void pim_neighbor_delete(struct interface *ifp, struct pim_neighbor *neigh,
+ const char *delete_message)
+{
+ struct pim_interface *pim_ifp;
+
+ pim_ifp = ifp->info;
+ assert(pim_ifp);
+
+ zlog_notice("PIM NEIGHBOR DOWN: neighbor %pPA on interface %s: %s",
+ &neigh->source_addr, ifp->name, delete_message);
+
+ THREAD_OFF(neigh->t_expire_timer);
+
+ pim_if_assert_on_neighbor_down(ifp, neigh->source_addr);
+
+ if (!PIM_OPTION_IS_SET(neigh->hello_options,
+ PIM_OPTION_MASK_LAN_PRUNE_DELAY)) {
+ /* update num. of neighbors without hello option lan_delay */
+
+ --pim_ifp->pim_number_of_nonlandelay_neighbors;
+ }
+
+ if (!PIM_OPTION_IS_SET(neigh->hello_options,
+ PIM_OPTION_MASK_DR_PRIORITY)) {
+ /* update num. of neighbors without dr_pri */
+
+ --pim_ifp->pim_dr_num_nondrpri_neighbors;
+ }
+
+ assert(neigh->propagation_delay_msec
+ <= pim_ifp->pim_neighbors_highest_propagation_delay_msec);
+ assert(neigh->override_interval_msec
+ <= pim_ifp->pim_neighbors_highest_override_interval_msec);
+
+ if (pim_if_lan_delay_enabled(ifp)) {
+
+ /* will delete a neighbor with highest propagation delay? */
+ if (neigh->propagation_delay_msec
+ == pim_ifp->pim_neighbors_highest_propagation_delay_msec) {
+ /* then find the next highest propagation delay */
+ pim_ifp->pim_neighbors_highest_propagation_delay_msec =
+ find_neighbors_next_highest_propagation_delay_msec(
+ ifp, neigh);
+ }
+
+ /* will delete a neighbor with highest override interval? */
+ if (neigh->override_interval_msec
+ == pim_ifp->pim_neighbors_highest_override_interval_msec) {
+ /* then find the next highest propagation delay */
+ pim_ifp->pim_neighbors_highest_override_interval_msec =
+ find_neighbors_next_highest_override_interval_msec(
+ ifp, neigh);
+ }
+ }
+
+ if (PIM_DEBUG_PIM_TRACE) {
+ zlog_debug("%s: deleting PIM neighbor %pPA on interface %s",
+ __func__, &neigh->source_addr, ifp->name);
+ }
+
+ listnode_delete(pim_ifp->pim_neighbor_list, neigh);
+
+ pim_neighbor_free(neigh);
+
+ sched_rpf_cache_refresh(pim_ifp->pim);
+}
+
+void pim_neighbor_delete_all(struct interface *ifp, const char *delete_message)
+{
+ struct pim_interface *pim_ifp;
+ struct listnode *neigh_node;
+ struct listnode *neigh_nextnode;
+ struct pim_neighbor *neigh;
+
+ pim_ifp = ifp->info;
+ assert(pim_ifp);
+
+ for (ALL_LIST_ELEMENTS(pim_ifp->pim_neighbor_list, neigh_node,
+ neigh_nextnode, neigh)) {
+ pim_neighbor_delete(ifp, neigh, delete_message);
+ }
+}
+
+struct prefix *pim_neighbor_find_secondary(struct pim_neighbor *neigh,
+ struct prefix *addr)
+{
+ struct listnode *node;
+ struct prefix *p;
+
+ if (!neigh->prefix_list)
+ return 0;
+
+ for (ALL_LIST_ELEMENTS_RO(neigh->prefix_list, node, p)) {
+ if (prefix_same(p, addr))
+ return p;
+ }
+
+ return NULL;
+}
+
+/*
+ RFC 4601: 4.3.4. Maintaining Secondary Address Lists
+
+ All the advertised secondary addresses in received Hello messages
+ must be checked against those previously advertised by all other
+ PIM neighbors on that interface. If there is a conflict and the
+ same secondary address was previously advertised by another
+ neighbor, then only the most recently received mapping MUST be
+ maintained, and an error message SHOULD be logged to the
+ administrator in a rate-limited manner.
+*/
+static void delete_from_neigh_addr(struct interface *ifp,
+ struct list *addr_list, pim_addr neigh_addr)
+{
+ struct listnode *addr_node;
+ struct prefix *addr;
+ struct pim_interface *pim_ifp;
+
+ pim_ifp = ifp->info;
+ assert(pim_ifp);
+
+ assert(addr_list);
+
+ /*
+ Scan secondary address list
+ */
+ for (ALL_LIST_ELEMENTS_RO(addr_list, addr_node, addr)) {
+ struct listnode *neigh_node;
+ struct pim_neighbor *neigh;
+
+ if (addr->family != PIM_AF)
+ continue;
+ /*
+ Scan neighbors
+ */
+ for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list,
+ neigh_node, neigh)) {
+ {
+ struct prefix *p = pim_neighbor_find_secondary(
+ neigh, addr);
+ if (p) {
+ zlog_info(
+ "secondary addr %pFXh recvd from neigh %pPA deleted from neigh %pPA on %s",
+ addr, &neigh_addr,
+ &neigh->source_addr, ifp->name);
+
+ listnode_delete(neigh->prefix_list, p);
+ prefix_free(&p);
+ }
+ }
+
+ } /* scan neighbors */
+
+ } /* scan addr list */
+}
+
+void pim_neighbor_update(struct pim_neighbor *neigh,
+ pim_hello_options hello_options, uint16_t holdtime,
+ uint32_t dr_priority, struct list *addr_list)
+{
+ struct pim_interface *pim_ifp = neigh->interface->info;
+ uint32_t old, new;
+
+ /* Received holdtime ? */
+ if (PIM_OPTION_IS_SET(hello_options, PIM_OPTION_MASK_HOLDTIME)) {
+ pim_neighbor_timer_reset(neigh, holdtime);
+ } else {
+ pim_neighbor_timer_reset(neigh,
+ PIM_IF_DEFAULT_HOLDTIME(pim_ifp));
+ }
+
+#ifdef DUMP_PREFIX_LIST
+ zlog_debug(
+ "%s: DUMP_PREFIX_LIST old_prefix_list=%x old_size=%d new_prefix_list=%x new_size=%d",
+ __func__, (unsigned)neigh->prefix_list,
+ neigh->prefix_list ? (int)listcount(neigh->prefix_list) : -1,
+ (unsigned)addr_list,
+ addr_list ? (int)listcount(addr_list) : -1);
+#endif
+
+ if (neigh->prefix_list == addr_list) {
+ if (addr_list) {
+ flog_err(
+ EC_LIB_DEVELOPMENT,
+ "%s: internal error: trying to replace same prefix list=%p",
+ __func__, (void *)addr_list);
+ }
+ } else {
+ /* Delete existing secondary address list */
+ delete_prefix_list(neigh);
+ }
+
+ if (addr_list) {
+ delete_from_neigh_addr(neigh->interface, addr_list,
+ neigh->source_addr);
+ }
+
+ /* Replace secondary address list */
+ neigh->prefix_list = addr_list;
+
+ update_dr_priority(neigh, hello_options, dr_priority);
+ new = PIM_OPTION_IS_SET(hello_options, PIM_OPTION_MASK_LAN_PRUNE_DELAY);
+ old = PIM_OPTION_IS_SET(neigh->hello_options,
+ PIM_OPTION_MASK_LAN_PRUNE_DELAY);
+
+ if (old != new) {
+ if (old)
+ ++pim_ifp->pim_number_of_nonlandelay_neighbors;
+ else
+ --pim_ifp->pim_number_of_nonlandelay_neighbors;
+ }
+ /*
+ Copy flags
+ */
+ neigh->hello_options = hello_options;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-11 13:49:50 +0000