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pim_bsm.c
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/*
* 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_rpf.h"
#include "pim_hello.h"
#include "pim_pim.h"
#include "pim_nht.h"
#include "pim_bsm.h"
#include "pim_time.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_NODE, "PIM BSR advertised RP info")
DEFINE_MTYPE_STATIC(PIMD, PIM_BSM_INFO, "PIM BSM Info")
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 ip pim bsm\n");
if (!pim_ifp->ucast_bsm_accept)
vty_out(vty, " no ip pim unicast-bsm\n");
}
}
void pim_free_bsgrp_data(struct bsgrp_node *bsgrp_node)
{
if (bsgrp_node->bsrp_list)
list_delete(&bsgrp_node->bsrp_list);
if (bsgrp_node->partial_bsrp_list)
list_delete(&bsgrp_node->partial_bsrp_list);
XFREE(MTYPE_PIM_BSGRP_NODE, bsgrp_node);
}
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_node_free(struct bsm_info *bsm)
{
XFREE(MTYPE_PIM_BSM_PKT_VAR_MEM, bsm->bsm);
XFREE(MTYPE_PIM_BSM_INFO, bsm);
}
static int pim_g2rp_list_compare(struct bsm_rpinfo *node1,
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;
if (node1->rp_address.s_addr < node2->rp_address.s_addr)
return 1;
if (node1->rp_address.s_addr > node2->rp_address.s_addr)
return -1;
return 0;
}
static void pim_free_bsrp_node(struct bsm_rpinfo *bsrp_info)
{
THREAD_OFF(bsrp_info->g2rp_timer);
XFREE(MTYPE_PIM_BSRP_NODE, bsrp_info);
}
static struct list *pim_alloc_bsrp_list(void)
{
struct list *new_list = NULL;
new_list = list_new();
if (!new_list)
return NULL;
new_list->cmp = (int (*)(void *, void *))pim_g2rp_list_compare;
new_list->del = (void (*)(void *))pim_free_bsrp_node;
return new_list;
}
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;
bsgrp->bsrp_list = pim_alloc_bsrp_list();
bsgrp->partial_bsrp_list = pim_alloc_bsrp_list();
if ((!bsgrp->bsrp_list) || (!bsgrp->partial_bsrp_list)) {
route_unlock_node(rn);
pim_free_bsgrp_data(bsgrp);
return NULL;
}
prefix_copy(&bsgrp->group, grp);
return bsgrp;
}
static int pim_on_bs_timer(struct thread *t)
{
struct route_node *rn;
struct bsm_scope *scope;
struct bsgrp_node *bsgrp_node;
struct bsm_rpinfo *bsrp;
struct prefix nht_p;
bool is_bsr_tracking = true;
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);
/* Remove next hop tracking for the bsr */
nht_p.family = AF_INET;
nht_p.prefixlen = IPV4_MAX_BITLEN;
nht_p.u.prefix4 = scope->current_bsr;
if (PIM_DEBUG_BSM)
zlog_debug("%s: Deregister BSR addr %pFX with Zebra NHT",
__func__, &nht_p);
pim_delete_tracked_nexthop(scope->pim, &nht_p, NULL, NULL,
is_bsr_tracking);
/* Reset scope zone data */
scope->accept_nofwd_bsm = false;
scope->state = ACCEPT_ANY;
scope->current_bsr.s_addr = INADDR_ANY;
scope->current_bsr_prio = 0;
scope->current_bsr_first_ts = 0;
scope->current_bsr_last_ts = 0;
scope->bsm_frag_tag = 0;
list_delete_all_node(scope->bsm_list);
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 */
if ((bsgrp_node->bsrp_list) && (bsgrp_node->bsrp_list->count)) {
bsrp = listnode_head(bsgrp_node->bsrp_list);
pim_g2rp_timer_restart(bsrp, bsrp->rp_holdtime);
}
/* clear pending list */
if ((bsgrp_node->partial_bsrp_list)
&& (bsgrp_node->partial_bsrp_list->count)) {
list_delete_all_node(bsgrp_node->partial_bsrp_list);
bsgrp_node->pend_rp_cnt = 0;
}
}
return 0;
}
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;
pim->global_scope.bsm_list = list_new();
pim->global_scope.bsm_list->del = (void (*)(void *))pim_bsm_node_free;
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);
if (pim->global_scope.bsm_list)
list_delete(&pim->global_scope.bsm_list);
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 int pim_on_g2rp_timer(struct thread *t)
{
struct bsm_rpinfo *bsrp;
struct bsm_rpinfo *bsrp_node;
struct bsgrp_node *bsgrp_node;
struct listnode *bsrp_ln;
struct pim_instance *pim;
struct rp_info *rp_info;
struct route_node *rn;
uint16_t elapse;
struct in_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 */
for (ALL_LIST_ELEMENTS_RO(bsgrp_node->bsrp_list, bsrp_ln, bsrp_node))
bsrp_node->elapse_time += elapse;
/* remove the expired nodes from the list */
list_filter_out_nodes(bsgrp_node->bsrp_list, is_hold_time_elapsed);
/* Get the next elected rp node */
bsrp = listnode_head(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 0;
}
rp_info = (struct rp_info *)rn->info;
if (!rp_info) {
route_unlock_node(rn);
return 0;
}
if (rp_info->rp_src != RP_SRC_STATIC) {
/* If new rp available, change it else delete the existing */
if (bsrp) {
bsrp_addr = bsrp->rp_address;
pim_g2rp_timer_start(
bsrp, (bsrp->rp_holdtime - bsrp->elapse_time));
pim_rp_change(pim, bsrp_addr, bsgrp_node->group,
RP_SRC_BSR);
} else {
pim_rp_del(pim, bsrp_addr, bsgrp_node->group, NULL,
RP_SRC_BSR);
}
}
if ((!bsgrp_node->bsrp_list->count)
&& (!bsgrp_node->partial_bsrp_list->count)) {
pim_free_bsgrp_node(pim->global_scope.bsrp_table,
&bsgrp_node->group);
pim_free_bsgrp_data(bsgrp_node);
}
return 0;
}
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: %pI4 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: %pI4",
__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 list *temp;
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 = listnode_head(bsgrp_node->bsrp_list);
/* Remove nodes with hold time 0 & check if list still has a head */
list_filter_out_nodes(bsgrp_node->partial_bsrp_list, is_hold_time_zero);
pend = listnode_head(bsgrp_node->partial_bsrp_list);
if (!str2prefix("224.0.0.0/4", &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_none(&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 ((active->rp_address.s_addr
!= pend->rp_address.s_addr))
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
*/
temp = bsgrp_node->bsrp_list;
bsgrp_node->bsrp_list = bsgrp_node->partial_bsrp_list;
bsgrp_node->partial_bsrp_list = temp;
if (active) {
pim_g2rp_timer_stop(active);
list_delete_all_node(bsgrp_node->partial_bsrp_list);
}
}
static bool pim_bsr_rpf_check(struct pim_instance *pim, struct in_addr bsr,
struct in_addr ip_src_addr)
{
struct pim_nexthop nexthop;
int result;
memset(&nexthop, 0, sizeof(nexthop));
/* New BSR recived */
if (bsr.s_addr != pim->global_scope.current_bsr.s_addr) {
result = pim_nexthop_match(pim, bsr, ip_src_addr);
/* Nexthop lookup pass for the new BSR address */
if (result)
return true;
if (PIM_DEBUG_BSM) {
char bsr_str[INET_ADDRSTRLEN];
pim_inet4_dump("<bsr?>", bsr, bsr_str, sizeof(bsr_str));
zlog_debug("%s : No route to BSR address %s", __func__,
bsr_str);
}
return false;
}
return pim_nexthop_match_nht_cache(pim, bsr, ip_src_addr);
}
static bool is_preferred_bsr(struct pim_instance *pim, struct in_addr bsr,
uint32_t bsr_prio)
{
if (bsr.s_addr == pim->global_scope.current_bsr.s_addr)
return true;
if (bsr_prio > pim->global_scope.current_bsr_prio)
return true;
else if (bsr_prio == pim->global_scope.current_bsr_prio) {
if (ntohl(bsr.s_addr)
>= ntohl(pim->global_scope.current_bsr.s_addr))
return true;
else
return false;
} else
return false;
}
static void pim_bsm_update(struct pim_instance *pim, struct in_addr bsr,
uint32_t bsr_prio)
{
struct pim_nexthop_cache pnc;
if (bsr.s_addr != pim->global_scope.current_bsr.s_addr) {
struct prefix nht_p;
bool is_bsr_tracking = true;
/* De-register old BSR and register new BSR with Zebra NHT */
nht_p.family = AF_INET;
nht_p.prefixlen = IPV4_MAX_BITLEN;
if (pim->global_scope.current_bsr.s_addr != INADDR_ANY) {
nht_p.u.prefix4 = pim->global_scope.current_bsr;
if (PIM_DEBUG_BSM)
zlog_debug(
"%s: Deregister BSR addr %pFX with Zebra NHT",
__func__, &nht_p);
pim_delete_tracked_nexthop(pim, &nht_p, NULL, NULL,
is_bsr_tracking);
}
nht_p.u.prefix4 = bsr;
if (PIM_DEBUG_BSM)
zlog_debug(
"%s: NHT Register BSR addr %pFX with Zebra NHT",
__func__, &nht_p);
memset(&pnc, 0, sizeof(struct pim_nexthop_cache));
pim_find_or_track_nexthop(pim, &nht_p, NULL, NULL,
is_bsr_tracking, &pnc);
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();
}
static bool pim_bsm_send_intf(uint8_t *buf, int len, struct interface *ifp,
struct in_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->name)) {
zlog_warn("%s: Could not send BSM message on interface: %s",
__func__, ifp->name);
return false;
}
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, struct in_addr dst_addr,
bool no_fwd)
{
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(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 accomodate next group + atleast
* 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(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;
struct in_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(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)
{
struct in_addr dst_addr;
struct pim_interface *pim_ifp;
struct bsm_scope *scope;
struct listnode *bsm_ln;
struct bsm_info *bsminfo;
char neigh_src_str[INET_ADDRSTRLEN];
uint32_t pim_mtu;
bool no_fwd = true;
bool ret = false;
if (PIM_DEBUG_BSM) {
pim_inet4_dump("<src?>", neigh->source_addr, neigh_src_str,
sizeof(neigh_src_str));
zlog_debug("%s: New neighbor %s seen on %s", __func__,
neigh_src_str, ifp->name);
}
pim_ifp = ifp->info;
/* DR only forwards BSM packet */
if (pim_ifp->pim_dr_addr.s_addr == pim_ifp->primary_address.s_addr) {
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 (!scope->bsm_list->count) {
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 %s", __func__,
neigh_src_str);
} else {
dst_addr = neigh->source_addr;
if (PIM_DEBUG_BSM)
zlog_debug("%s: Sending BSM ucast to %s", __func__,
neigh_src_str);
}
pim_mtu = ifp->mtu - MAX_IP_HDR_LEN;
pim_hello_require(ifp);
for (ALL_LIST_ELEMENTS_RO(scope->bsm_list, bsm_ln, bsminfo)) {
if (pim_mtu < bsminfo->size) {
ret = pim_bsm_frag_send(bsminfo->bsm, bsminfo->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(bsminfo->bsm, bsminfo->size,
PIM_MSG_TYPE_BOOTSTRAP, no_fwd);
ret = pim_bsm_send_intf(bsminfo->bsm, bsminfo->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, struct in_addr rp,
uint8_t hashmasklen)