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-rw-r--r--pimd/pim_bsm.c1467
1 files changed, 1467 insertions, 0 deletions
diff --git a/pimd/pim_bsm.c b/pimd/pim_bsm.c
new file mode 100644
index 0000000..9942886
--- /dev/null
+++ b/pimd/pim_bsm.c
@@ -0,0 +1,1467 @@
+/*
+ * pim_bsm.c: PIM BSM handling routines
+ *
+ * Copyright (C) 2018-19 Vmware, Inc.
+ * Saravanan K
+ *
+ * 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
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "if.h"
+#include "pimd.h"
+#include "pim_iface.h"
+#include "pim_instance.h"
+#include "pim_neighbor.h"
+#include "pim_rpf.h"
+#include "pim_hello.h"
+#include "pim_pim.h"
+#include "pim_nht.h"
+#include "pim_bsm.h"
+#include "pim_time.h"
+#include "pim_zebra.h"
+#include "pim_util.h"
+
+/* Functions forward declaration */
+static void pim_bs_timer_start(struct bsm_scope *scope, int bs_timeout);
+static void pim_g2rp_timer_start(struct bsm_rpinfo *bsrp, int hold_time);
+static inline void pim_g2rp_timer_restart(struct bsm_rpinfo *bsrp,
+ int hold_time);
+
+/* Memory Types */
+DEFINE_MTYPE_STATIC(PIMD, PIM_BSGRP_NODE, "PIM BSR advertised grp info");
+DEFINE_MTYPE_STATIC(PIMD, PIM_BSRP_INFO, "PIM BSR advertised RP info");
+DEFINE_MTYPE_STATIC(PIMD, PIM_BSM_FRAG, "PIM BSM fragment");
+DEFINE_MTYPE_STATIC(PIMD, PIM_BSM_PKT_VAR_MEM, "PIM BSM Packet");
+
+/* All bsm packets forwarded shall be fit within ip mtu less iphdr(max) */
+#define MAX_IP_HDR_LEN 24
+
+/* pim_bsm_write_config - Write the interface pim bsm configuration.*/
+void pim_bsm_write_config(struct vty *vty, struct interface *ifp)
+{
+ struct pim_interface *pim_ifp = ifp->info;
+
+ if (pim_ifp) {
+ if (!pim_ifp->bsm_enable)
+ vty_out(vty, " no " PIM_AF_NAME " pim bsm\n");
+ if (!pim_ifp->ucast_bsm_accept)
+ vty_out(vty, " no " PIM_AF_NAME " pim unicast-bsm\n");
+ }
+}
+
+static void pim_bsm_rpinfo_free(struct bsm_rpinfo *bsrp_info)
+{
+ THREAD_OFF(bsrp_info->g2rp_timer);
+ XFREE(MTYPE_PIM_BSRP_INFO, bsrp_info);
+}
+
+static void pim_bsm_rpinfos_free(struct bsm_rpinfos_head *head)
+{
+ struct bsm_rpinfo *bsrp_info;
+
+ while ((bsrp_info = bsm_rpinfos_pop(head)))
+ pim_bsm_rpinfo_free(bsrp_info);
+}
+
+static void pim_free_bsgrp_data(struct bsgrp_node *bsgrp_node)
+{
+ pim_bsm_rpinfos_free(bsgrp_node->bsrp_list);
+ pim_bsm_rpinfos_free(bsgrp_node->partial_bsrp_list);
+ XFREE(MTYPE_PIM_BSGRP_NODE, bsgrp_node);
+}
+
+static void pim_free_bsgrp_node(struct route_table *rt, struct prefix *grp)
+{
+ struct route_node *rn;
+
+ rn = route_node_lookup(rt, grp);
+ if (rn) {
+ rn->info = NULL;
+ route_unlock_node(rn);
+ route_unlock_node(rn);
+ }
+}
+
+static void pim_bsm_frag_free(struct bsm_frag *bsfrag)
+{
+ XFREE(MTYPE_PIM_BSM_FRAG, bsfrag);
+}
+
+static void pim_bsm_frags_free(struct bsm_scope *scope)
+{
+ struct bsm_frag *bsfrag;
+
+ while ((bsfrag = bsm_frags_pop(scope->bsm_frags)))
+ pim_bsm_frag_free(bsfrag);
+}
+
+int pim_bsm_rpinfo_cmp(const struct bsm_rpinfo *node1,
+ const struct bsm_rpinfo *node2)
+{
+ /* RP election Algo :
+ * Step-1 : Loweset Rp priority will have higher precedance.
+ * Step-2 : If priority same then higher hash val will have
+ * higher precedance.
+ * Step-3 : If Hash val is same then highest rp address will
+ * become elected RP.
+ */
+ if (node1->rp_prio < node2->rp_prio)
+ return -1;
+ if (node1->rp_prio > node2->rp_prio)
+ return 1;
+ if (node1->hash < node2->hash)
+ return 1;
+ if (node1->hash > node2->hash)
+ return -1;
+ return pim_addr_cmp(node2->rp_address, node1->rp_address);
+}
+
+static struct bsgrp_node *pim_bsm_new_bsgrp_node(struct route_table *rt,
+ struct prefix *grp)
+{
+ struct route_node *rn;
+ struct bsgrp_node *bsgrp;
+
+ rn = route_node_get(rt, grp);
+ if (!rn) {
+ zlog_warn("%s: route node creation failed", __func__);
+ return NULL;
+ }
+ bsgrp = XCALLOC(MTYPE_PIM_BSGRP_NODE, sizeof(struct bsgrp_node));
+
+ rn->info = bsgrp;
+ bsm_rpinfos_init(bsgrp->bsrp_list);
+ bsm_rpinfos_init(bsgrp->partial_bsrp_list);
+
+ prefix_copy(&bsgrp->group, grp);
+ return bsgrp;
+}
+
+static void pim_on_bs_timer(struct thread *t)
+{
+ struct route_node *rn;
+ struct bsm_scope *scope;
+ struct bsgrp_node *bsgrp_node;
+ struct bsm_rpinfo *bsrp;
+
+ scope = THREAD_ARG(t);
+ THREAD_OFF(scope->bs_timer);
+
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s: Bootstrap Timer expired for scope: %d",
+ __func__, scope->sz_id);
+
+ pim_nht_bsr_del(scope->pim, scope->current_bsr);
+ /* Reset scope zone data */
+ scope->state = ACCEPT_ANY;
+ scope->current_bsr = PIMADDR_ANY;
+ scope->current_bsr_prio = 0;
+ scope->current_bsr_first_ts = 0;
+ scope->current_bsr_last_ts = 0;
+ scope->bsm_frag_tag = 0;
+ pim_bsm_frags_free(scope);
+
+ for (rn = route_top(scope->bsrp_table); rn; rn = route_next(rn)) {
+
+ bsgrp_node = (struct bsgrp_node *)rn->info;
+ if (!bsgrp_node) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s: bsgrp_node is null", __func__);
+ continue;
+ }
+ /* Give grace time for rp to continue for another hold time */
+ bsrp = bsm_rpinfos_first(bsgrp_node->bsrp_list);
+ if (bsrp)
+ pim_g2rp_timer_restart(bsrp, bsrp->rp_holdtime);
+
+ /* clear pending list */
+ pim_bsm_rpinfos_free(bsgrp_node->partial_bsrp_list);
+ bsgrp_node->pend_rp_cnt = 0;
+ }
+}
+
+static void pim_bs_timer_stop(struct bsm_scope *scope)
+{
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s : BS timer being stopped of sz: %d", __func__,
+ scope->sz_id);
+ THREAD_OFF(scope->bs_timer);
+}
+
+static void pim_bs_timer_start(struct bsm_scope *scope, int bs_timeout)
+{
+ if (!scope) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s : Invalid scope(NULL).", __func__);
+ return;
+ }
+ THREAD_OFF(scope->bs_timer);
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s : starting bs timer for scope %d with timeout %d secs",
+ __func__, scope->sz_id, bs_timeout);
+ thread_add_timer(router->master, pim_on_bs_timer, scope, bs_timeout,
+ &scope->bs_timer);
+}
+
+static inline void pim_bs_timer_restart(struct bsm_scope *scope, int bs_timeout)
+{
+ pim_bs_timer_start(scope, bs_timeout);
+}
+
+void pim_bsm_proc_init(struct pim_instance *pim)
+{
+ memset(&pim->global_scope, 0, sizeof(struct bsm_scope));
+
+ pim->global_scope.sz_id = PIM_GBL_SZ_ID;
+ pim->global_scope.bsrp_table = route_table_init();
+ pim->global_scope.accept_nofwd_bsm = true;
+ pim->global_scope.state = NO_INFO;
+ pim->global_scope.pim = pim;
+ bsm_frags_init(pim->global_scope.bsm_frags);
+ pim_bs_timer_start(&pim->global_scope, PIM_BS_TIME);
+}
+
+void pim_bsm_proc_free(struct pim_instance *pim)
+{
+ struct route_node *rn;
+ struct bsgrp_node *bsgrp;
+
+ pim_bs_timer_stop(&pim->global_scope);
+ pim_bsm_frags_free(&pim->global_scope);
+
+ for (rn = route_top(pim->global_scope.bsrp_table); rn;
+ rn = route_next(rn)) {
+ bsgrp = rn->info;
+ if (!bsgrp)
+ continue;
+ pim_free_bsgrp_data(bsgrp);
+ }
+
+ route_table_finish(pim->global_scope.bsrp_table);
+}
+
+static bool is_hold_time_elapsed(void *data)
+{
+ struct bsm_rpinfo *bsrp;
+
+ bsrp = data;
+
+ if (bsrp->elapse_time < bsrp->rp_holdtime)
+ return false;
+ else
+ return true;
+}
+
+static void pim_on_g2rp_timer(struct thread *t)
+{
+ struct bsm_rpinfo *bsrp;
+ struct bsm_rpinfo *bsrp_node;
+ struct bsgrp_node *bsgrp_node;
+ struct pim_instance *pim;
+ struct rp_info *rp_info;
+ struct route_node *rn;
+ uint16_t elapse;
+ pim_addr bsrp_addr;
+
+ bsrp = THREAD_ARG(t);
+ THREAD_OFF(bsrp->g2rp_timer);
+ bsgrp_node = bsrp->bsgrp_node;
+
+ /* elapse time is the hold time of expired node */
+ elapse = bsrp->rp_holdtime;
+ bsrp_addr = bsrp->rp_address;
+
+ /* update elapse for all bsrp nodes */
+ frr_each_safe (bsm_rpinfos, bsgrp_node->bsrp_list, bsrp_node) {
+ bsrp_node->elapse_time += elapse;
+
+ if (is_hold_time_elapsed(bsrp_node)) {
+ bsm_rpinfos_del(bsgrp_node->bsrp_list, bsrp_node);
+ pim_bsm_rpinfo_free(bsrp_node);
+ }
+ }
+
+ /* Get the next elected rp node */
+ bsrp = bsm_rpinfos_first(bsgrp_node->bsrp_list);
+ pim = bsgrp_node->scope->pim;
+ rn = route_node_lookup(pim->rp_table, &bsgrp_node->group);
+
+ if (!rn) {
+ zlog_warn("%s: Route node doesn't exist", __func__);
+ return;
+ }
+
+ rp_info = (struct rp_info *)rn->info;
+
+ if (!rp_info) {
+ route_unlock_node(rn);
+ return;
+ }
+
+ if (rp_info->rp_src != RP_SRC_STATIC) {
+ /* If new rp available, change it else delete the existing */
+ if (bsrp) {
+ pim_g2rp_timer_start(
+ bsrp, (bsrp->rp_holdtime - bsrp->elapse_time));
+ pim_rp_change(pim, bsrp->rp_address, bsgrp_node->group,
+ RP_SRC_BSR);
+ } else {
+ pim_rp_del(pim, bsrp_addr, bsgrp_node->group, NULL,
+ RP_SRC_BSR);
+ }
+ }
+
+ if (!bsm_rpinfos_count(bsgrp_node->bsrp_list)
+ && !bsm_rpinfos_count(bsgrp_node->partial_bsrp_list)) {
+ pim_free_bsgrp_node(pim->global_scope.bsrp_table,
+ &bsgrp_node->group);
+ pim_free_bsgrp_data(bsgrp_node);
+ }
+}
+
+static void pim_g2rp_timer_start(struct bsm_rpinfo *bsrp, int hold_time)
+{
+ if (!bsrp) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s : Invalid brsp(NULL).", __func__);
+ return;
+ }
+ THREAD_OFF(bsrp->g2rp_timer);
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s : starting g2rp timer for grp: %pFX - rp: %pPAs with timeout %d secs(Actual Hold time : %d secs)",
+ __func__, &bsrp->bsgrp_node->group, &bsrp->rp_address,
+ hold_time, bsrp->rp_holdtime);
+
+ thread_add_timer(router->master, pim_on_g2rp_timer, bsrp, hold_time,
+ &bsrp->g2rp_timer);
+}
+
+static inline void pim_g2rp_timer_restart(struct bsm_rpinfo *bsrp,
+ int hold_time)
+{
+ pim_g2rp_timer_start(bsrp, hold_time);
+}
+
+static void pim_g2rp_timer_stop(struct bsm_rpinfo *bsrp)
+{
+ if (!bsrp)
+ return;
+
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s : stopping g2rp timer for grp: %pFX - rp: %pPAs",
+ __func__, &bsrp->bsgrp_node->group,
+ &bsrp->rp_address);
+
+ THREAD_OFF(bsrp->g2rp_timer);
+}
+
+static bool is_hold_time_zero(void *data)
+{
+ struct bsm_rpinfo *bsrp;
+
+ bsrp = data;
+
+ if (bsrp->rp_holdtime)
+ return false;
+ else
+ return true;
+}
+
+static void pim_instate_pend_list(struct bsgrp_node *bsgrp_node)
+{
+ struct bsm_rpinfo *active;
+ struct bsm_rpinfo *pend;
+ struct rp_info *rp_info;
+ struct route_node *rn;
+ struct pim_instance *pim;
+ struct rp_info *rp_all;
+ struct prefix group_all;
+ bool had_rp_node = true;
+
+ pim = bsgrp_node->scope->pim;
+ active = bsm_rpinfos_first(bsgrp_node->bsrp_list);
+
+ /* Remove nodes with hold time 0 & check if list still has a head */
+ frr_each_safe (bsm_rpinfos, bsgrp_node->partial_bsrp_list, pend) {
+ if (is_hold_time_zero(pend)) {
+ bsm_rpinfos_del(bsgrp_node->partial_bsrp_list, pend);
+ pim_bsm_rpinfo_free(pend);
+ }
+ }
+
+ pend = bsm_rpinfos_first(bsgrp_node->partial_bsrp_list);
+
+ if (!pim_get_all_mcast_group(&group_all))
+ return;
+
+ rp_all = pim_rp_find_match_group(pim, &group_all);
+ rn = route_node_lookup(pim->rp_table, &bsgrp_node->group);
+
+ if (pend)
+ pim_g2rp_timer_start(pend, pend->rp_holdtime);
+
+ /* if rp node doesn't exist or exist but not configured(rp_all),
+ * install the rp from head(if exists) of partial list. List is
+ * is sorted such that head is the elected RP for the group.
+ */
+ if (!rn || (prefix_same(&rp_all->group, &bsgrp_node->group) &&
+ pim_rpf_addr_is_inaddr_any(&rp_all->rp))) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s: Route node doesn't exist", __func__);
+ if (pend)
+ pim_rp_new(pim, pend->rp_address, bsgrp_node->group,
+ NULL, RP_SRC_BSR);
+ had_rp_node = false;
+ } else {
+ rp_info = (struct rp_info *)rn->info;
+ if (!rp_info) {
+ route_unlock_node(rn);
+ if (pend)
+ pim_rp_new(pim, pend->rp_address,
+ bsgrp_node->group, NULL, RP_SRC_BSR);
+ had_rp_node = false;
+ }
+ }
+
+ /* We didn't have rp node and pending list is empty(unlikely), cleanup*/
+ if ((!had_rp_node) && (!pend)) {
+ pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table,
+ &bsgrp_node->group);
+ pim_free_bsgrp_data(bsgrp_node);
+ return;
+ }
+
+ if ((had_rp_node) && (rp_info->rp_src != RP_SRC_STATIC)) {
+ /* This means we searched and got rp node, needs unlock */
+ route_unlock_node(rn);
+
+ if (active && pend) {
+ if (pim_addr_cmp(active->rp_address, pend->rp_address))
+ pim_rp_change(pim, pend->rp_address,
+ bsgrp_node->group, RP_SRC_BSR);
+ }
+
+ /* Possible when the first BSM has group with 0 rp count */
+ if ((!active) && (!pend)) {
+ if (PIM_DEBUG_BSM) {
+ zlog_debug(
+ "%s: Both bsrp and partial list are empty",
+ __func__);
+ }
+ pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table,
+ &bsgrp_node->group);
+ pim_free_bsgrp_data(bsgrp_node);
+ return;
+ }
+
+ /* Possible when a group with 0 rp count received in BSM */
+ if ((active) && (!pend)) {
+ pim_rp_del(pim, active->rp_address, bsgrp_node->group,
+ NULL, RP_SRC_BSR);
+ pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table,
+ &bsgrp_node->group);
+ if (PIM_DEBUG_BSM) {
+ zlog_debug("%s:Pend List is null,del grp node",
+ __func__);
+ }
+ pim_free_bsgrp_data(bsgrp_node);
+ return;
+ }
+ }
+
+ if ((had_rp_node) && (rp_info->rp_src == RP_SRC_STATIC)) {
+ /* We need to unlock rn this case */
+ route_unlock_node(rn);
+ /* there is a chance that static rp exist and bsrp cleaned
+ * so clean bsgrp node if pending list empty
+ */
+ if (!pend) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s: Partial list is empty, static rp exists",
+ __func__);
+ pim_free_bsgrp_node(bsgrp_node->scope->bsrp_table,
+ &bsgrp_node->group);
+ pim_free_bsgrp_data(bsgrp_node);
+ return;
+ }
+ }
+
+ /* swap the list & delete all nodes in partial list (old bsrp_list)
+ * before swap
+ * active is head of bsrp list
+ * pend is head of partial list
+ * After swap
+ * active is head of partial list
+ * pend is head of bsrp list
+ * So check appriate head after swap and clean the new partial list
+ */
+ bsm_rpinfos_swap_all(bsgrp_node->bsrp_list,
+ bsgrp_node->partial_bsrp_list);
+
+ if (active)
+ pim_g2rp_timer_stop(active);
+ pim_bsm_rpinfos_free(bsgrp_node->partial_bsrp_list);
+}
+
+static bool is_preferred_bsr(struct pim_instance *pim, pim_addr bsr,
+ uint32_t bsr_prio)
+{
+ if (!pim_addr_cmp(bsr, pim->global_scope.current_bsr))
+ return true;
+
+ if (bsr_prio > pim->global_scope.current_bsr_prio)
+ return true;
+
+ else if (bsr_prio == pim->global_scope.current_bsr_prio) {
+ if (pim_addr_cmp(bsr, pim->global_scope.current_bsr) >= 0)
+ return true;
+ else
+ return false;
+ } else
+ return false;
+}
+
+static void pim_bsm_update(struct pim_instance *pim, pim_addr bsr,
+ uint32_t bsr_prio)
+{
+ if (pim_addr_cmp(bsr, pim->global_scope.current_bsr)) {
+ pim_nht_bsr_del(pim, pim->global_scope.current_bsr);
+ pim_nht_bsr_add(pim, bsr);
+
+ pim->global_scope.current_bsr = bsr;
+ pim->global_scope.current_bsr_first_ts =
+ pim_time_monotonic_sec();
+ pim->global_scope.state = ACCEPT_PREFERRED;
+ }
+ pim->global_scope.current_bsr_prio = bsr_prio;
+ pim->global_scope.current_bsr_last_ts = pim_time_monotonic_sec();
+}
+
+void pim_bsm_clear(struct pim_instance *pim)
+{
+ struct route_node *rn;
+ struct route_node *rpnode;
+ struct bsgrp_node *bsgrp;
+ pim_addr nht_p;
+ struct prefix g_all;
+ struct rp_info *rp_all;
+ struct pim_upstream *up;
+ struct rp_info *rp_info;
+ bool upstream_updated = false;
+
+ pim_nht_bsr_del(pim, pim->global_scope.current_bsr);
+
+ /* Reset scope zone data */
+ pim->global_scope.accept_nofwd_bsm = false;
+ pim->global_scope.state = ACCEPT_ANY;
+ pim->global_scope.current_bsr = PIMADDR_ANY;
+ pim->global_scope.current_bsr_prio = 0;
+ pim->global_scope.current_bsr_first_ts = 0;
+ pim->global_scope.current_bsr_last_ts = 0;
+ pim->global_scope.bsm_frag_tag = 0;
+ pim_bsm_frags_free(&pim->global_scope);
+
+ pim_bs_timer_stop(&pim->global_scope);
+
+ for (rn = route_top(pim->global_scope.bsrp_table); rn;
+ rn = route_next(rn)) {
+ bsgrp = rn->info;
+ if (!bsgrp)
+ continue;
+
+ rpnode = route_node_lookup(pim->rp_table, &bsgrp->group);
+
+ if (!rpnode) {
+ pim_free_bsgrp_node(bsgrp->scope->bsrp_table,
+ &bsgrp->group);
+ pim_free_bsgrp_data(bsgrp);
+ continue;
+ }
+
+ rp_info = (struct rp_info *)rpnode->info;
+
+ if ((!rp_info) || (rp_info->rp_src != RP_SRC_BSR)) {
+ pim_free_bsgrp_node(bsgrp->scope->bsrp_table,
+ &bsgrp->group);
+ pim_free_bsgrp_data(bsgrp);
+ continue;
+ }
+
+ /* Deregister addr with Zebra NHT */
+ nht_p = rp_info->rp.rpf_addr;
+
+ if (PIM_DEBUG_PIM_NHT_RP) {
+ zlog_debug("%s: Deregister RP addr %pPA with Zebra ",
+ __func__, &nht_p);
+ }
+
+ pim_delete_tracked_nexthop(pim, nht_p, NULL, rp_info);
+
+ if (!pim_get_all_mcast_group(&g_all))
+ return;
+
+ rp_all = pim_rp_find_match_group(pim, &g_all);
+
+ if (rp_all == rp_info) {
+ rp_all->rp.rpf_addr = PIMADDR_ANY;
+ rp_all->i_am_rp = 0;
+ } else {
+ /* Delete the rp_info from rp-list */
+ listnode_delete(pim->rp_list, rp_info);
+
+ /* Delete the rp node from rp_table */
+ rpnode->info = NULL;
+ route_unlock_node(rpnode);
+ route_unlock_node(rpnode);
+ XFREE(MTYPE_PIM_RP, rp_info);
+ }
+
+ pim_free_bsgrp_node(bsgrp->scope->bsrp_table, &bsgrp->group);
+ pim_free_bsgrp_data(bsgrp);
+ }
+ pim_rp_refresh_group_to_rp_mapping(pim);
+
+
+ frr_each (rb_pim_upstream, &pim->upstream_head, up) {
+ /* Find the upstream (*, G) whose upstream address is same as
+ * the RP
+ */
+ if (!pim_addr_is_any(up->sg.src))
+ continue;
+
+ struct prefix grp;
+ struct rp_info *trp_info;
+
+ pim_addr_to_prefix(&grp, up->sg.grp);
+ trp_info = pim_rp_find_match_group(pim, &grp);
+
+ /* RP not found for the group grp */
+ if (pim_rpf_addr_is_inaddr_any(&trp_info->rp)) {
+ pim_upstream_rpf_clear(pim, up);
+ pim_rp_set_upstream_addr(pim, &up->upstream_addr,
+ up->sg.src, up->sg.grp);
+ } else {
+ /* RP found for the group grp */
+ pim_upstream_update(pim, up);
+ upstream_updated = true;
+ }
+ }
+
+ if (upstream_updated)
+ pim_zebra_update_all_interfaces(pim);
+}
+
+static bool pim_bsm_send_intf(uint8_t *buf, int len, struct interface *ifp,
+ pim_addr dst_addr)
+{
+ struct pim_interface *pim_ifp;
+
+ pim_ifp = ifp->info;
+
+ if (!pim_ifp) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s: Pim interface not available for %s",
+ __func__, ifp->name);
+ return false;
+ }
+
+ if (pim_ifp->pim_sock_fd == -1) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s: Pim sock not available for %s",
+ __func__, ifp->name);
+ return false;
+ }
+
+ if (pim_msg_send(pim_ifp->pim_sock_fd, pim_ifp->primary_address,
+ dst_addr, buf, len, ifp)) {
+ zlog_warn("%s: Could not send BSM message on interface: %s",
+ __func__, ifp->name);
+ return false;
+ }
+
+ if (!pim_ifp->pim_passive_enable)
+ pim_ifp->pim_ifstat_bsm_tx++;
+
+ pim_ifp->pim->bsm_sent++;
+ return true;
+}
+
+static bool pim_bsm_frag_send(uint8_t *buf, uint32_t len, struct interface *ifp,
+ uint32_t pim_mtu, pim_addr dst_addr, bool no_fwd)
+{
+ struct pim_interface *pim_ifp = ifp->info;
+ struct bsmmsg_grpinfo *grpinfo, *curgrp;
+ uint8_t *firstgrp_ptr;
+ uint8_t *pkt;
+ uint8_t *pak_start;
+ uint32_t parsed_len = 0;
+ uint32_t this_pkt_rem;
+ uint32_t copy_byte_count;
+ uint32_t this_pkt_len;
+ uint8_t total_rp_cnt;
+ uint8_t this_rp_cnt;
+ uint8_t frag_rp_cnt;
+ uint8_t rp_fit_cnt;
+ bool pak_pending = false;
+
+ /* MTU passed here is PIM MTU (IP MTU less IP Hdr) */
+ if (pim_mtu < (PIM_MIN_BSM_LEN)) {
+ zlog_warn(
+ "%s: mtu(pim mtu: %d) size less than minimum bootstrap len",
+ __func__, pim_mtu);
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s: mtu (pim mtu:%d) less than minimum bootstrap len",
+ __func__, pim_mtu);
+ return false;
+ }
+
+ pak_start = XCALLOC(MTYPE_PIM_BSM_PKT_VAR_MEM, pim_mtu);
+
+ pkt = pak_start;
+
+ /* Fill PIM header later before sending packet to calc checksum */
+ pkt += PIM_MSG_HEADER_LEN;
+ buf += PIM_MSG_HEADER_LEN;
+
+ /* copy bsm header to new packet at offset of pim hdr */
+ memcpy(pkt, buf, PIM_BSM_HDR_LEN);
+ pkt += PIM_BSM_HDR_LEN;
+ buf += PIM_BSM_HDR_LEN;
+ parsed_len += (PIM_MSG_HEADER_LEN + PIM_BSM_HDR_LEN);
+
+ /* Store the position of first grp ptr, which can be reused for
+ * next packet to start filling group. old bsm header and pim hdr
+ * remains. So need not be filled again for next packet onwards.
+ */
+ firstgrp_ptr = pkt;
+
+ /* we received mtu excluding IP hdr len as param
+ * now this_pkt_rem is mtu excluding
+ * PIM_BSM_HDR_LEN + PIM_MSG_HEADER_LEN
+ */
+ this_pkt_rem = pim_mtu - (PIM_BSM_HDR_LEN + PIM_MSG_HEADER_LEN);
+
+ /* For each group till the packet length parsed */
+ while (parsed_len < len) {
+ /* pkt ---> fragment's current pointer
+ * buf ---> input buffer's current pointer
+ * mtu ---> size of the pim packet - PIM header
+ * curgrp ---> current group on the fragment
+ * grpinfo ---> current group on the input buffer
+ * this_pkt_rem ---> bytes remaing on the current fragment
+ * rp_fit_cnt ---> num of rp for current grp that
+ * fits this frag
+ * total_rp_cnt ---> total rp present for the group in the buf
+ * frag_rp_cnt ---> no of rp for the group to be fit in
+ * the frag
+ * this_rp_cnt ---> how many rp have we parsed
+ */
+ grpinfo = (struct bsmmsg_grpinfo *)buf;
+ memcpy(pkt, buf, PIM_BSM_GRP_LEN);
+ curgrp = (struct bsmmsg_grpinfo *)pkt;
+ parsed_len += PIM_BSM_GRP_LEN;
+ pkt += PIM_BSM_GRP_LEN;
+ buf += PIM_BSM_GRP_LEN;
+ this_pkt_rem -= PIM_BSM_GRP_LEN;
+
+ /* initialize rp count and total_rp_cnt before the rp loop */
+ this_rp_cnt = 0;
+ total_rp_cnt = grpinfo->frag_rp_count;
+
+ /* Loop till all RPs for the group parsed */
+ while (this_rp_cnt < total_rp_cnt) {
+ /* All RP from a group processed here.
+ * group is pointed by grpinfo.
+ * At this point make sure buf pointing to a RP
+ * within a group
+ */
+ rp_fit_cnt = this_pkt_rem / PIM_BSM_RP_LEN;
+
+ /* calculate how many rp am i going to copy in
+ * this frag
+ */
+ if (rp_fit_cnt > (total_rp_cnt - this_rp_cnt))
+ frag_rp_cnt = total_rp_cnt - this_rp_cnt;
+ else
+ frag_rp_cnt = rp_fit_cnt;
+
+ /* populate the frag rp count for the current grp */
+ curgrp->frag_rp_count = frag_rp_cnt;
+ copy_byte_count = frag_rp_cnt * PIM_BSM_RP_LEN;
+
+ /* copy all the rp that we are fitting in this
+ * frag for the grp
+ */
+ memcpy(pkt, buf, copy_byte_count);
+ this_rp_cnt += frag_rp_cnt;
+ buf += copy_byte_count;
+ pkt += copy_byte_count;
+ parsed_len += copy_byte_count;
+ this_pkt_rem -= copy_byte_count;
+
+ /* Either we couldn't fit all rp for the group or the
+ * mtu reached
+ */
+ if ((this_rp_cnt < total_rp_cnt)
+ || (this_pkt_rem
+ < (PIM_BSM_GRP_LEN + PIM_BSM_RP_LEN))) {
+ /* No space to fit in more rp, send this pkt */
+ this_pkt_len = pim_mtu - this_pkt_rem;
+ pim_msg_build_header(
+ pim_ifp->primary_address, dst_addr,
+ pak_start, this_pkt_len,
+ PIM_MSG_TYPE_BOOTSTRAP, no_fwd);
+ pim_bsm_send_intf(pak_start, this_pkt_len, ifp,
+ dst_addr);
+
+ /* Construct next fragment. Reuse old packet */
+ pkt = firstgrp_ptr;
+ this_pkt_rem = pim_mtu - (PIM_BSM_HDR_LEN
+ + PIM_MSG_HEADER_LEN);
+
+ /* If pkt can't accommodate next group + at
+ * least one rp, we must break out of this inner
+ * loop and process next RP
+ */
+ if (total_rp_cnt == this_rp_cnt)
+ break;
+
+ /* If some more RPs for the same group pending,
+ * fill grp hdr
+ */
+ memcpy(pkt, (uint8_t *)grpinfo,
+ PIM_BSM_GRP_LEN);
+ curgrp = (struct bsmmsg_grpinfo *)pkt;
+ pkt += PIM_BSM_GRP_LEN;
+ this_pkt_rem -= PIM_BSM_GRP_LEN;
+ pak_pending = false;
+ } else {
+ /* We filled something but not yet sent out */
+ pak_pending = true;
+ }
+ } /* while RP count */
+ } /*while parsed len */
+
+ /* Send if we have any unsent packet */
+ if (pak_pending) {
+ this_pkt_len = pim_mtu - this_pkt_rem;
+ pim_msg_build_header(pim_ifp->primary_address, dst_addr,
+ pak_start, this_pkt_len,
+ PIM_MSG_TYPE_BOOTSTRAP, no_fwd);
+ pim_bsm_send_intf(pak_start, (pim_mtu - this_pkt_rem), ifp,
+ dst_addr);
+ }
+ XFREE(MTYPE_PIM_BSM_PKT_VAR_MEM, pak_start);
+ return true;
+}
+
+static void pim_bsm_fwd_whole_sz(struct pim_instance *pim, uint8_t *buf,
+ uint32_t len, int sz)
+{
+ struct interface *ifp;
+ struct pim_interface *pim_ifp;
+ pim_addr dst_addr;
+ uint32_t pim_mtu;
+ bool no_fwd = false;
+ bool ret = false;
+
+ /* For now only global scope zone is supported, so send on all
+ * pim interfaces in the vrf
+ */
+ dst_addr = qpim_all_pim_routers_addr;
+ FOR_ALL_INTERFACES (pim->vrf, ifp) {
+ pim_ifp = ifp->info;
+ if ((!pim_ifp) || (!pim_ifp->bsm_enable))
+ continue;
+
+ /*
+ * RFC 5059 Sec 3.4:
+ * When a Bootstrap message is forwarded, it is forwarded out
+ * of every multicast-capable interface that has PIM neighbors.
+ *
+ * So skipping pim interfaces with no neighbors.
+ */
+ if (listcount(pim_ifp->pim_neighbor_list) == 0)
+ continue;
+
+ pim_hello_require(ifp);
+ pim_mtu = ifp->mtu - MAX_IP_HDR_LEN;
+ if (pim_mtu < len) {
+ ret = pim_bsm_frag_send(buf, len, ifp, pim_mtu,
+ dst_addr, no_fwd);
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s: pim_bsm_frag_send returned %s",
+ __func__, ret ? "TRUE" : "FALSE");
+ } else {
+ pim_msg_build_header(pim_ifp->primary_address, dst_addr,
+ buf, len, PIM_MSG_TYPE_BOOTSTRAP,
+ no_fwd);
+ if (!pim_bsm_send_intf(buf, len, ifp, dst_addr)) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s: pim_bsm_send_intf returned false",
+ __func__);
+ }
+ }
+ }
+}
+
+bool pim_bsm_new_nbr_fwd(struct pim_neighbor *neigh, struct interface *ifp)
+{
+ pim_addr dst_addr;
+ struct pim_interface *pim_ifp;
+ struct bsm_scope *scope;
+ struct bsm_frag *bsfrag;
+ uint32_t pim_mtu;
+ bool no_fwd = true;
+ bool ret = false;
+
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s: New neighbor %pPA seen on %s", __func__,
+ &neigh->source_addr, ifp->name);
+
+ pim_ifp = ifp->info;
+
+ /* DR only forwards BSM packet */
+ if (!pim_addr_cmp(pim_ifp->pim_dr_addr, pim_ifp->primary_address)) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s: It is not DR, so don't forward BSM packet",
+ __func__);
+ }
+
+ if (!pim_ifp->bsm_enable) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s: BSM proc not enabled on %s", __func__,
+ ifp->name);
+ return ret;
+ }
+
+ scope = &pim_ifp->pim->global_scope;
+
+ if (!bsm_frags_count(scope->bsm_frags)) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s: BSM list for the scope is empty",
+ __func__);
+ return ret;
+ }
+
+ if (!pim_ifp->ucast_bsm_accept) {
+ dst_addr = qpim_all_pim_routers_addr;
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s: Sending BSM mcast to %pPA", __func__,
+ &neigh->source_addr);
+ } else {
+ dst_addr = neigh->source_addr;
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s: Sending BSM ucast to %pPA", __func__,
+ &neigh->source_addr);
+ }
+ pim_mtu = ifp->mtu - MAX_IP_HDR_LEN;
+ pim_hello_require(ifp);
+
+ frr_each (bsm_frags, scope->bsm_frags, bsfrag) {
+ if (pim_mtu < bsfrag->size) {
+ ret = pim_bsm_frag_send(bsfrag->data, bsfrag->size, ifp,
+ pim_mtu, dst_addr, no_fwd);
+ if (!ret) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s: pim_bsm_frag_send failed",
+ __func__);
+ }
+ } else {
+ /* Pim header needs to be constructed */
+ pim_msg_build_header(pim_ifp->primary_address, dst_addr,
+ bsfrag->data, bsfrag->size,
+ PIM_MSG_TYPE_BOOTSTRAP, no_fwd);
+ ret = pim_bsm_send_intf(bsfrag->data, bsfrag->size, ifp,
+ dst_addr);
+ if (!ret) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s: pim_bsm_frag_send failed",
+ __func__);
+ }
+ }
+ }
+ return ret;
+}
+
+struct bsgrp_node *pim_bsm_get_bsgrp_node(struct bsm_scope *scope,
+ struct prefix *grp)
+{
+ struct route_node *rn;
+ struct bsgrp_node *bsgrp;
+
+ rn = route_node_lookup(scope->bsrp_table, grp);
+ if (!rn) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s: Route node doesn't exist for the group",
+ __func__);
+ return NULL;
+ }
+ bsgrp = rn->info;
+ route_unlock_node(rn);
+
+ return bsgrp;
+}
+
+static uint32_t hash_calc_on_grp_rp(struct prefix group, pim_addr rp,
+ uint8_t hashmasklen)
+{
+ uint64_t temp;
+ uint32_t hash;
+ uint32_t grpaddr;
+ uint32_t rp_add;
+ uint32_t mask = 0xffffffff;
+
+ /* mask to be made zero if hashmasklen is 0 because mask << 32
+ * may not give 0. hashmasklen can be 0 to 32.
+ */
+ if (hashmasklen == 0)
+ mask = 0;
+
+ /* in_addr stores ip in big endian, hence network byte order
+ * convert to uint32 before processing hash
+ */
+#if PIM_IPV == 4
+ grpaddr = ntohl(group.u.prefix4.s_addr);
+#else
+ grpaddr = group.u.prefix6.s6_addr32[0] ^ group.u.prefix6.s6_addr32[1] ^
+ group.u.prefix6.s6_addr32[2] ^ group.u.prefix6.s6_addr32[3];
+#endif
+ /* Avoid shifting by 32 bit on a 32 bit register */
+ if (hashmasklen)
+ grpaddr = grpaddr & ((mask << (32 - hashmasklen)));
+ else
+ grpaddr = grpaddr & mask;
+
+#if PIM_IPV == 4
+ rp_add = ntohl(rp.s_addr);
+#else
+ rp_add = rp.s6_addr32[0] ^ rp.s6_addr32[1] ^ rp.s6_addr32[2] ^
+ rp.s6_addr32[3];
+#endif
+ temp = 1103515245 * ((1103515245 * (uint64_t)grpaddr + 12345) ^ rp_add)
+ + 12345;
+ hash = temp & (0x7fffffff);
+ return hash;
+}
+
+static bool pim_install_bsm_grp_rp(struct pim_instance *pim,
+ struct bsgrp_node *grpnode,
+ struct bsmmsg_rpinfo *rp)
+{
+ struct bsm_rpinfo *bsm_rpinfo;
+ uint8_t hashMask_len = pim->global_scope.hashMasklen;
+
+ /*memory allocation for bsm_rpinfo */
+ bsm_rpinfo = XCALLOC(MTYPE_PIM_BSRP_INFO, sizeof(*bsm_rpinfo));
+
+ bsm_rpinfo->rp_prio = rp->rp_pri;
+ bsm_rpinfo->rp_holdtime = rp->rp_holdtime;
+ bsm_rpinfo->rp_address = rp->rpaddr.addr;
+ bsm_rpinfo->elapse_time = 0;
+
+ /* Back pointer to the group node. */
+ bsm_rpinfo->bsgrp_node = grpnode;
+
+ /* update hash for this rp node */
+ bsm_rpinfo->hash = hash_calc_on_grp_rp(grpnode->group, rp->rpaddr.addr,
+ hashMask_len);
+ if (bsm_rpinfos_add(grpnode->partial_bsrp_list, bsm_rpinfo) == NULL) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s, bs_rpinfo node added to the partial bs_rplist.",
+ __func__);
+ return true;
+ }
+
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s: list node not added", __func__);
+
+ XFREE(MTYPE_PIM_BSRP_INFO, bsm_rpinfo);
+ return false;
+}
+
+static void pim_update_pending_rp_cnt(struct bsm_scope *sz,
+ struct bsgrp_node *bsgrp,
+ uint16_t bsm_frag_tag,
+ uint32_t total_rp_count)
+{
+ if (bsgrp->pend_rp_cnt) {
+ /* received bsm is different packet ,
+ * it is not same fragment.
+ */
+ if (bsm_frag_tag != bsgrp->frag_tag) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s,Received a new BSM ,so clear the pending bs_rpinfo list.",
+ __func__);
+ pim_bsm_rpinfos_free(bsgrp->partial_bsrp_list);
+ bsgrp->pend_rp_cnt = total_rp_count;
+ }
+ } else
+ bsgrp->pend_rp_cnt = total_rp_count;
+
+ bsgrp->frag_tag = bsm_frag_tag;
+}
+
+/* Parsing BSR packet and adding to partial list of corresponding bsgrp node */
+static bool pim_bsm_parse_install_g2rp(struct bsm_scope *scope, uint8_t *buf,
+ int buflen, uint16_t bsm_frag_tag)
+{
+ struct bsmmsg_grpinfo grpinfo;
+ struct bsmmsg_rpinfo rpinfo;
+ struct prefix group;
+ struct bsgrp_node *bsgrp = NULL;
+ int frag_rp_cnt = 0;
+ int offset = 0;
+ int ins_count = 0;
+ pim_addr grp_addr;
+
+ while (buflen > offset) {
+ if (offset + (int)sizeof(struct bsmmsg_grpinfo) > buflen) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s: buflen received %d is less than the internal data structure of the packet would suggest",
+ __func__, buflen);
+ return false;
+ }
+ /* Extract Group tlv from BSM */
+ memcpy(&grpinfo, buf, sizeof(struct bsmmsg_grpinfo));
+ grp_addr = grpinfo.group.addr;
+
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s, Group %pPAs Rpcount:%d Fragment-Rp-count:%d",
+ __func__, &grp_addr, grpinfo.rp_count,
+ grpinfo.frag_rp_count);
+
+ buf += sizeof(struct bsmmsg_grpinfo);
+ offset += sizeof(struct bsmmsg_grpinfo);
+
+ group.family = PIM_AF;
+ if (grpinfo.group.mask > PIM_MAX_BITLEN) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s, prefix length specified: %d is too long",
+ __func__, grpinfo.group.mask);
+ return false;
+ }
+
+ pim_addr_to_prefix(&group, grp_addr);
+ group.prefixlen = grpinfo.group.mask;
+
+ /* Get the Group node for the BSM rp table */
+ bsgrp = pim_bsm_get_bsgrp_node(scope, &group);
+
+ if (grpinfo.rp_count == 0) {
+ struct bsm_rpinfo *old_rpinfo;
+
+ /* BSR explicitly no longer has RPs for this group */
+ if (!bsgrp)
+ continue;
+
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s, Rp count is zero for group: %pPAs",
+ __func__, &grp_addr);
+
+ old_rpinfo = bsm_rpinfos_first(bsgrp->bsrp_list);
+ if (old_rpinfo)
+ pim_rp_del(scope->pim, old_rpinfo->rp_address,
+ group, NULL, RP_SRC_BSR);
+
+ pim_free_bsgrp_node(scope->bsrp_table, &bsgrp->group);
+ pim_free_bsgrp_data(bsgrp);
+ continue;
+ }
+
+ if (!bsgrp) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s, Create new BSM Group node.",
+ __func__);
+
+ /* create a new node to be added to the tree. */
+ bsgrp = pim_bsm_new_bsgrp_node(scope->bsrp_table,
+ &group);
+
+ if (!bsgrp) {
+ zlog_debug(
+ "%s, Failed to get the BSM group node.",
+ __func__);
+ continue;
+ }
+
+ bsgrp->scope = scope;
+ }
+
+ pim_update_pending_rp_cnt(scope, bsgrp, bsm_frag_tag,
+ grpinfo.rp_count);
+ frag_rp_cnt = grpinfo.frag_rp_count;
+ ins_count = 0;
+
+ while (frag_rp_cnt--) {
+ if (offset + (int)sizeof(struct bsmmsg_rpinfo)
+ > buflen) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s, buflen received: %u is less than the internal data structure of the packet would suggest",
+ __func__, buflen);
+ return false;
+ }
+
+ /* Extract RP address tlv from BSM */
+ memcpy(&rpinfo, buf, sizeof(struct bsmmsg_rpinfo));
+ rpinfo.rp_holdtime = ntohs(rpinfo.rp_holdtime);
+ buf += sizeof(struct bsmmsg_rpinfo);
+ offset += sizeof(struct bsmmsg_rpinfo);
+
+ if (PIM_DEBUG_BSM) {
+ pim_addr rp_addr;
+
+ rp_addr = rpinfo.rpaddr.addr;
+ zlog_debug(
+ "%s, Rp address - %pPAs; pri:%d hold:%d",
+ __func__, &rp_addr, rpinfo.rp_pri,
+ rpinfo.rp_holdtime);
+ }
+
+ /* Call Install api to update grp-rp mappings */
+ if (pim_install_bsm_grp_rp(scope->pim, bsgrp, &rpinfo))
+ ins_count++;
+ }
+
+ bsgrp->pend_rp_cnt -= ins_count;
+
+ if (!bsgrp->pend_rp_cnt) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s, Recvd all the rps for this group, so bsrp list with penidng rp list.",
+ __func__);
+ /* replace the bsrp_list with pending list */
+ pim_instate_pend_list(bsgrp);
+ }
+ }
+ return true;
+}
+
+int pim_bsm_process(struct interface *ifp, pim_sgaddr *sg, uint8_t *buf,
+ uint32_t buf_size, bool no_fwd)
+{
+ struct bsm_hdr *bshdr;
+ int sz = PIM_GBL_SZ_ID;
+ struct bsmmsg_grpinfo *msg_grp;
+ struct pim_interface *pim_ifp = NULL;
+ struct bsm_frag *bsfrag;
+ struct pim_instance *pim;
+ uint16_t frag_tag;
+ pim_addr bsr_addr;
+ bool empty_bsm = false;
+
+ /* BSM Packet acceptance validation */
+ pim_ifp = ifp->info;
+ if (!pim_ifp) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s: multicast not enabled on interface %s",
+ __func__, ifp->name);
+ return -1;
+ }
+
+ if (pim_ifp->pim_passive_enable) {
+ if (PIM_DEBUG_PIM_PACKETS)
+ zlog_debug(
+ "skip receiving PIM message on passive interface %s",
+ ifp->name);
+ return 0;
+ }
+
+ pim_ifp->pim_ifstat_bsm_rx++;
+ pim = pim_ifp->pim;
+ pim->bsm_rcvd++;
+
+ /* Drop if bsm processing is disabled on interface */
+ if (!pim_ifp->bsm_enable) {
+ zlog_warn("%s: BSM not enabled on interface %s", __func__,
+ ifp->name);
+ pim_ifp->pim_ifstat_bsm_cfg_miss++;
+ pim->bsm_dropped++;
+ return -1;
+ }
+
+ if (buf_size < (PIM_MSG_HEADER_LEN + sizeof(struct bsm_hdr))) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s: received buffer length of %d which is too small to properly decode",
+ __func__, buf_size);
+ return -1;
+ }
+
+ bshdr = (struct bsm_hdr *)(buf + PIM_MSG_HEADER_LEN);
+ if (bshdr->hm_len > PIM_MAX_BITLEN) {
+ zlog_warn(
+ "Bad hashmask length for %s; got %hhu, expected value in range 0-32",
+ PIM_AF_NAME, bshdr->hm_len);
+ pim->bsm_dropped++;
+ return -1;
+ }
+ pim->global_scope.hashMasklen = bshdr->hm_len;
+ frag_tag = ntohs(bshdr->frag_tag);
+ /* NB: bshdr->bsr_addr.addr is packed/unaligned => memcpy */
+ memcpy(&bsr_addr, &bshdr->bsr_addr.addr, sizeof(bsr_addr));
+
+ /* Identify empty BSM */
+ if ((buf_size - PIM_BSM_HDR_LEN - PIM_MSG_HEADER_LEN) < PIM_BSM_GRP_LEN)
+ empty_bsm = true;
+
+ if (!empty_bsm) {
+ msg_grp = (struct bsmmsg_grpinfo *)(buf + PIM_MSG_HEADER_LEN
+ + PIM_BSM_HDR_LEN);
+ /* Currently we don't support scope zoned BSM */
+ if (msg_grp->group.sz) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s : Administratively scoped range BSM received",
+ __func__);
+ pim_ifp->pim_ifstat_bsm_invalid_sz++;
+ pim->bsm_dropped++;
+ return -1;
+ }
+ }
+
+ /* Drop if bsr is not preferred bsr */
+ if (!is_preferred_bsr(pim, bsr_addr, bshdr->bsr_prio)) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s : Received a non-preferred BSM",
+ __func__);
+ pim->bsm_dropped++;
+ return -1;
+ }
+
+ if (no_fwd) {
+ /* only accept no-forward BSM if quick refresh on startup */
+ if ((pim->global_scope.accept_nofwd_bsm)
+ || (frag_tag == pim->global_scope.bsm_frag_tag)) {
+ pim->global_scope.accept_nofwd_bsm = false;
+ } else {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s : nofwd_bsm received on %pPAs when accpt_nofwd_bsm false",
+ __func__, &bsr_addr);
+ pim->bsm_dropped++;
+ pim_ifp->pim_ifstat_ucast_bsm_cfg_miss++;
+ return -1;
+ }
+ }
+
+ /* BSM packet is seen, so resetting accept_nofwd_bsm to false */
+ if (pim->global_scope.accept_nofwd_bsm)
+ pim->global_scope.accept_nofwd_bsm = false;
+
+ if (!pim_addr_cmp(sg->grp, qpim_all_pim_routers_addr)) {
+ /* Multicast BSMs are only accepted if source interface & IP
+ * match RPF towards the BSR's IP address, or they have
+ * no-forward set
+ */
+ if (!no_fwd &&
+ !pim_nht_bsr_rpf_check(pim, bsr_addr, ifp, sg->src)) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "BSM check: RPF to BSR %pPAs is not %pPA%%%s",
+ &bsr_addr, &sg->src, ifp->name);
+ pim->bsm_dropped++;
+ return -1;
+ }
+ } else if (if_address_is_local(&sg->grp, PIM_AF, pim->vrf->vrf_id)) {
+ /* Unicast BSM received - if ucast bsm not enabled on
+ * the interface, drop it
+ */
+ if (!pim_ifp->ucast_bsm_accept) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug(
+ "%s : Unicast BSM not enabled on interface %s",
+ __func__, ifp->name);
+ pim_ifp->pim_ifstat_ucast_bsm_cfg_miss++;
+ pim->bsm_dropped++;
+ return -1;
+ }
+
+ } else {
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s : Invalid destination address",
+ __func__);
+ pim->bsm_dropped++;
+ return -1;
+ }
+
+ if (empty_bsm) {
+ if (PIM_DEBUG_BSM)
+ zlog_debug("%s : Empty Pref BSM received", __func__);
+ }
+ /* Parse Update bsm rp table and install/uninstall rp if required */
+ if (!pim_bsm_parse_install_g2rp(
+ &pim_ifp->pim->global_scope,
+ (buf + PIM_BSM_HDR_LEN + PIM_MSG_HEADER_LEN),
+ (buf_size - PIM_BSM_HDR_LEN - PIM_MSG_HEADER_LEN),
+ frag_tag)) {
+ if (PIM_DEBUG_BSM) {
+ zlog_debug("%s, Parsing BSM failed.", __func__);
+ }
+ pim->bsm_dropped++;
+ return -1;
+ }
+ /* Restart the bootstrap timer */
+ pim_bs_timer_restart(&pim_ifp->pim->global_scope,
+ PIM_BSR_DEFAULT_TIMEOUT);
+
+ /* If new BSM received, clear the old bsm database */
+ if (pim_ifp->pim->global_scope.bsm_frag_tag != frag_tag) {
+ if (PIM_DEBUG_BSM) {
+ zlog_debug("%s: Current frag tag: %d Frag teg rcvd: %d",
+ __func__,
+ pim_ifp->pim->global_scope.bsm_frag_tag,
+ frag_tag);
+ }
+ pim_bsm_frags_free(&pim_ifp->pim->global_scope);
+ pim_ifp->pim->global_scope.bsm_frag_tag = frag_tag;
+ }
+
+ /* update the scope information from bsm */
+ pim_bsm_update(pim, bsr_addr, bshdr->bsr_prio);
+
+ if (!no_fwd) {
+ pim_bsm_fwd_whole_sz(pim_ifp->pim, buf, buf_size, sz);
+ bsfrag = XCALLOC(MTYPE_PIM_BSM_FRAG,
+ sizeof(struct bsm_frag) + buf_size);
+
+ bsfrag->size = buf_size;
+ memcpy(bsfrag->data, buf, buf_size);
+ bsm_frags_add_tail(pim_ifp->pim->global_scope.bsm_frags,
+ bsfrag);
+ }
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-04 19:51:33 +0000