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pim_upstream.c
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pim_upstream.c
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/*
* 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 "zebra/rib.h"
#include "log.h"
#include "zclient.h"
#include "memory.h"
#include "thread.h"
#include "linklist.h"
#include "vty.h"
#include "plist.h"
#include "hash.h"
#include "jhash.h"
#include "wheel.h"
#include "pimd.h"
#include "pim_pim.h"
#include "pim_str.h"
#include "pim_time.h"
#include "pim_iface.h"
#include "pim_join.h"
#include "pim_zlookup.h"
#include "pim_upstream.h"
#include "pim_ifchannel.h"
#include "pim_neighbor.h"
#include "pim_rpf.h"
#include "pim_zebra.h"
#include "pim_oil.h"
#include "pim_macro.h"
#include "pim_rp.h"
#include "pim_br.h"
#include "pim_register.h"
#include "pim_msdp.h"
#include "pim_jp_agg.h"
#include "pim_nht.h"
#include "pim_ssm.h"
static void join_timer_stop(struct pim_upstream *up);
static void
pim_upstream_update_assert_tracking_desired(struct pim_upstream *up);
/*
* A (*,G) or a (*,*) is going away
* remove the parent pointer from
* those pointing at us
*/
static void pim_upstream_remove_children(struct pim_instance *pim,
struct pim_upstream *up)
{
struct pim_upstream *child;
if (!up->sources)
return;
while (!list_isempty(up->sources)) {
child = listnode_head(up->sources);
listnode_delete(up->sources, child);
if (PIM_UPSTREAM_FLAG_TEST_SRC_LHR(child->flags)) {
PIM_UPSTREAM_FLAG_UNSET_SRC_LHR(child->flags);
child = pim_upstream_del(pim, child,
__PRETTY_FUNCTION__);
}
if (child)
child->parent = NULL;
}
list_delete_and_null(&up->sources);
}
/*
* A (*,G) or a (*,*) is being created
* Find the children that would point
* at us.
*/
static void pim_upstream_find_new_children(struct pim_instance *pim,
struct pim_upstream *up)
{
struct pim_upstream *child;
struct listnode *ch_node;
if ((up->sg.src.s_addr != INADDR_ANY)
&& (up->sg.grp.s_addr != INADDR_ANY))
return;
if ((up->sg.src.s_addr == INADDR_ANY)
&& (up->sg.grp.s_addr == INADDR_ANY))
return;
for (ALL_LIST_ELEMENTS_RO(pim->upstream_list, ch_node, child)) {
if ((up->sg.grp.s_addr != INADDR_ANY)
&& (child->sg.grp.s_addr == up->sg.grp.s_addr)
&& (child != up)) {
child->parent = up;
listnode_add_sort(up->sources, child);
}
}
}
/*
* If we have a (*,*) || (S,*) there is no parent
* If we have a (S,G), find the (*,G)
* If we have a (*,G), find the (*,*)
*/
static struct pim_upstream *pim_upstream_find_parent(struct pim_instance *pim,
struct pim_upstream *child)
{
struct prefix_sg any = child->sg;
struct pim_upstream *up = NULL;
// (S,G)
if ((child->sg.src.s_addr != INADDR_ANY)
&& (child->sg.grp.s_addr != INADDR_ANY)) {
any.src.s_addr = INADDR_ANY;
up = pim_upstream_find(pim, &any);
if (up)
listnode_add(up->sources, child);
return up;
}
return NULL;
}
static void upstream_channel_oil_detach(struct pim_upstream *up)
{
if (up->channel_oil) {
/* Detaching from channel_oil, channel_oil may exist post del,
but upstream would not keep reference of it
*/
up->channel_oil->up = NULL;
pim_channel_oil_del(up->channel_oil);
up->channel_oil = NULL;
}
}
struct pim_upstream *pim_upstream_del(struct pim_instance *pim,
struct pim_upstream *up, const char *name)
{
bool notify_msdp = false;
struct prefix nht_p;
if (PIM_DEBUG_TRACE)
zlog_debug(
"%s(%s): Delete %s[%s] ref count: %d , flags: %d c_oil ref count %d (Pre decrement)",
__PRETTY_FUNCTION__, name, up->sg_str, pim->vrf->name,
up->ref_count, up->flags,
up->channel_oil->oil_ref_count);
--up->ref_count;
if (up->ref_count >= 1)
return up;
THREAD_OFF(up->t_ka_timer);
THREAD_OFF(up->t_rs_timer);
THREAD_OFF(up->t_msdp_reg_timer);
if (up->join_state == PIM_UPSTREAM_JOINED) {
pim_jp_agg_single_upstream_send(&up->rpf, up, 0);
if (up->sg.src.s_addr == INADDR_ANY) {
/* if a (*, G) entry in the joined state is being
* deleted we
* need to notify MSDP */
notify_msdp = true;
}
}
join_timer_stop(up);
pim_jp_agg_upstream_verification(up, false);
up->rpf.source_nexthop.interface = NULL;
if (up->sg.src.s_addr != INADDR_ANY) {
wheel_remove_item(pim->upstream_sg_wheel, up);
notify_msdp = true;
}
pim_upstream_remove_children(pim, up);
if (up->sources)
list_delete_and_null(&up->sources);
pim_mroute_del(up->channel_oil, __PRETTY_FUNCTION__);
upstream_channel_oil_detach(up);
list_delete_and_null(&up->ifchannels);
if (up->parent && up->parent->sources)
listnode_delete(up->parent->sources, up);
up->parent = NULL;
listnode_delete(pim->upstream_list, up);
hash_release(pim->upstream_hash, up);
if (notify_msdp) {
pim_msdp_up_del(pim, &up->sg);
}
/* Deregister addr with Zebra NHT */
nht_p.family = AF_INET;
nht_p.prefixlen = IPV4_MAX_BITLEN;
nht_p.u.prefix4 = up->upstream_addr;
if (PIM_DEBUG_TRACE) {
char buf[PREFIX2STR_BUFFER];
prefix2str(&nht_p, buf, sizeof(buf));
zlog_debug("%s: Deregister upstream %s addr %s with Zebra NHT",
__PRETTY_FUNCTION__, up->sg_str, buf);
}
pim_delete_tracked_nexthop(pim, &nht_p, up, NULL);
XFREE(MTYPE_PIM_UPSTREAM, up);
return NULL;
}
void pim_upstream_send_join(struct pim_upstream *up)
{
if (PIM_DEBUG_TRACE) {
char rpf_str[PREFIX_STRLEN];
pim_addr_dump("<rpf?>", &up->rpf.rpf_addr, rpf_str,
sizeof(rpf_str));
zlog_debug("%s: RPF'%s=%s(%s) for Interface %s",
__PRETTY_FUNCTION__, up->sg_str, rpf_str,
pim_upstream_state2str(up->join_state),
up->rpf.source_nexthop.interface->name);
if (pim_rpf_addr_is_inaddr_any(&up->rpf)) {
zlog_debug("%s: can't send join upstream: RPF'%s=%s",
__PRETTY_FUNCTION__, up->sg_str, rpf_str);
/* warning only */
}
}
/* send Join(S,G) to the current upstream neighbor */
pim_jp_agg_single_upstream_send(&up->rpf, up, 1 /* join */);
}
static int on_join_timer(struct thread *t)
{
struct pim_upstream *up;
up = THREAD_ARG(t);
/*
* In the case of a HFR we will not ahve anyone to send this to.
*/
if (PIM_UPSTREAM_FLAG_TEST_FHR(up->flags))
return 0;
/*
* Don't send the join if the outgoing interface is a loopback
* But since this might change leave the join timer running
*/
if (up->rpf.source_nexthop
.interface && !if_is_loopback(up->rpf.source_nexthop.interface))
pim_upstream_send_join(up);
join_timer_start(up);
return 0;
}
static void join_timer_stop(struct pim_upstream *up)
{
struct pim_neighbor *nbr;
THREAD_OFF(up->t_join_timer);
nbr = pim_neighbor_find(up->rpf.source_nexthop.interface,
up->rpf.rpf_addr.u.prefix4);
if (nbr)
pim_jp_agg_remove_group(nbr->upstream_jp_agg, up);
pim_jp_agg_upstream_verification(up, false);
}
void join_timer_start(struct pim_upstream *up)
{
struct pim_neighbor *nbr = NULL;
if (up->rpf.source_nexthop.interface) {
nbr = pim_neighbor_find(up->rpf.source_nexthop.interface,
up->rpf.rpf_addr.u.prefix4);
if (PIM_DEBUG_PIM_EVENTS) {
zlog_debug(
"%s: starting %d sec timer for upstream (S,G)=%s",
__PRETTY_FUNCTION__, qpim_t_periodic,
up->sg_str);
}
}
if (nbr)
pim_jp_agg_add_group(nbr->upstream_jp_agg, up, 1);
else {
THREAD_OFF(up->t_join_timer);
thread_add_timer(master, on_join_timer, up, qpim_t_periodic,
&up->t_join_timer);
}
pim_jp_agg_upstream_verification(up, true);
}
/*
* This is only called when we are switching the upstream
* J/P from one neighbor to another
*
* As such we need to remove from the old list and
* add to the new list.
*/
void pim_upstream_join_timer_restart(struct pim_upstream *up,
struct pim_rpf *old)
{
// THREAD_OFF(up->t_join_timer);
join_timer_start(up);
}
static void pim_upstream_join_timer_restart_msec(struct pim_upstream *up,
int interval_msec)
{
if (PIM_DEBUG_PIM_EVENTS) {
zlog_debug("%s: restarting %d msec timer for upstream (S,G)=%s",
__PRETTY_FUNCTION__, interval_msec, up->sg_str);
}
THREAD_OFF(up->t_join_timer);
thread_add_timer_msec(master, on_join_timer, up, interval_msec,
&up->t_join_timer);
}
void pim_upstream_join_suppress(struct pim_upstream *up,
struct in_addr rpf_addr, int holdtime)
{
long t_joinsuppress_msec;
long join_timer_remain_msec;
t_joinsuppress_msec =
MIN(pim_if_t_suppressed_msec(up->rpf.source_nexthop.interface),
1000 * holdtime);
join_timer_remain_msec = pim_time_timer_remain_msec(up->t_join_timer);
if (PIM_DEBUG_TRACE) {
char rpf_str[INET_ADDRSTRLEN];
pim_inet4_dump("<rpf?>", rpf_addr, rpf_str, sizeof(rpf_str));
zlog_debug(
"%s %s: detected Join%s to RPF'(S,G)=%s: join_timer=%ld msec t_joinsuppress=%ld msec",
__FILE__, __PRETTY_FUNCTION__, up->sg_str, rpf_str,
join_timer_remain_msec, t_joinsuppress_msec);
}
if (join_timer_remain_msec < t_joinsuppress_msec) {
if (PIM_DEBUG_TRACE) {
zlog_debug(
"%s %s: suppressing Join(S,G)=%s for %ld msec",
__FILE__, __PRETTY_FUNCTION__, up->sg_str,
t_joinsuppress_msec);
}
pim_upstream_join_timer_restart_msec(up, t_joinsuppress_msec);
}
}
void pim_upstream_join_timer_decrease_to_t_override(const char *debug_label,
struct pim_upstream *up)
{
long join_timer_remain_msec;
int t_override_msec;
join_timer_remain_msec = pim_time_timer_remain_msec(up->t_join_timer);
t_override_msec =
pim_if_t_override_msec(up->rpf.source_nexthop.interface);
if (PIM_DEBUG_TRACE) {
char rpf_str[INET_ADDRSTRLEN];
pim_inet4_dump("<rpf?>", up->rpf.rpf_addr.u.prefix4, rpf_str,
sizeof(rpf_str));
zlog_debug(
"%s: to RPF'%s=%s: join_timer=%ld msec t_override=%d msec",
debug_label, up->sg_str, rpf_str,
join_timer_remain_msec, t_override_msec);
}
if (join_timer_remain_msec > t_override_msec) {
if (PIM_DEBUG_TRACE) {
zlog_debug(
"%s: decreasing (S,G)=%s join timer to t_override=%d msec",
debug_label, up->sg_str, t_override_msec);
}
pim_upstream_join_timer_restart_msec(up, t_override_msec);
}
}
static void forward_on(struct pim_upstream *up)
{
struct listnode *chnode;
struct listnode *chnextnode;
struct pim_ifchannel *ch = NULL;
/* scan (S,G) state */
for (ALL_LIST_ELEMENTS(up->ifchannels, chnode, chnextnode, ch)) {
if (pim_macro_chisin_oiflist(ch))
pim_forward_start(ch);
} /* scan iface channel list */
}
static void forward_off(struct pim_upstream *up)
{
struct listnode *chnode;
struct listnode *chnextnode;
struct pim_ifchannel *ch;
/* scan per-interface (S,G) state */
for (ALL_LIST_ELEMENTS(up->ifchannels, chnode, chnextnode, ch)) {
pim_forward_stop(ch, false);
} /* scan iface channel list */
}
static int pim_upstream_could_register(struct pim_upstream *up)
{
struct pim_interface *pim_ifp = NULL;
if (up->rpf.source_nexthop.interface)
pim_ifp = up->rpf.source_nexthop.interface->info;
else {
if (PIM_DEBUG_TRACE)
zlog_debug("%s: up %s RPF is not present",
__PRETTY_FUNCTION__, up->sg_str);
}
if (pim_ifp && PIM_I_am_DR(pim_ifp)
&& pim_if_connected_to_source(up->rpf.source_nexthop.interface,
up->sg.src))
return 1;
return 0;
}
/* Source registration is supressed for SSM groups. When the SSM range changes
* we re-revaluate register setup for existing upstream entries */
void pim_upstream_register_reevaluate(struct pim_instance *pim)
{
struct listnode *upnode;
struct pim_upstream *up;
for (ALL_LIST_ELEMENTS_RO(pim->upstream_list, upnode, up)) {
/* If FHR is set CouldRegister is True. Also check if the flow
* is actually active; if it is not kat setup will trigger
* source
* registration whenever the flow becomes active. */
if (!PIM_UPSTREAM_FLAG_TEST_FHR(up->flags) || !up->t_ka_timer)
continue;
if (pim_is_grp_ssm(pim, up->sg.grp)) {
/* clear the register state for SSM groups */
if (up->reg_state != PIM_REG_NOINFO) {
if (PIM_DEBUG_PIM_EVENTS)
zlog_debug(
"Clear register for %s as G is now SSM",
up->sg_str);
/* remove regiface from the OIL if it is there*/
pim_channel_del_oif(up->channel_oil,
pim->regiface,
PIM_OIF_FLAG_PROTO_PIM);
up->reg_state = PIM_REG_NOINFO;
}
} else {
/* register ASM sources with the RP */
if (up->reg_state == PIM_REG_NOINFO) {
if (PIM_DEBUG_PIM_EVENTS)
zlog_debug(
"Register %s as G is now ASM",
up->sg_str);
pim_channel_add_oif(up->channel_oil,
pim->regiface,
PIM_OIF_FLAG_PROTO_PIM);
up->reg_state = PIM_REG_JOIN;
}
}
}
}
void pim_upstream_switch(struct pim_instance *pim, struct pim_upstream *up,
enum pim_upstream_state new_state)
{
enum pim_upstream_state old_state = up->join_state;
if (PIM_DEBUG_PIM_EVENTS) {
zlog_debug("%s: PIM_UPSTREAM_%s: (S,G) old: %s new: %s",
__PRETTY_FUNCTION__, up->sg_str,
pim_upstream_state2str(up->join_state),
pim_upstream_state2str(new_state));
}
up->join_state = new_state;
if (old_state != new_state)
up->state_transition = pim_time_monotonic_sec();
pim_upstream_update_assert_tracking_desired(up);
if (new_state == PIM_UPSTREAM_JOINED) {
if (old_state != PIM_UPSTREAM_JOINED) {
int old_fhr = PIM_UPSTREAM_FLAG_TEST_FHR(up->flags);
forward_on(up);
pim_msdp_up_join_state_changed(pim, up);
if (pim_upstream_could_register(up)) {
PIM_UPSTREAM_FLAG_SET_FHR(up->flags);
if (!old_fhr
&& PIM_UPSTREAM_FLAG_TEST_SRC_STREAM(
up->flags)) {
pim_upstream_keep_alive_timer_start(
up, pim->keep_alive_time);
pim_register_join(up);
}
} else {
pim_upstream_send_join(up);
join_timer_start(up);
}
} else {
forward_on(up);
}
} else {
forward_off(up);
if (old_state == PIM_UPSTREAM_JOINED)
pim_msdp_up_join_state_changed(pim, up);
/* IHR, Trigger SGRpt on *,G IIF to prune S,G from RPT towards
RP.
If I am RP for G then send S,G prune to its IIF. */
if (pim_upstream_is_sg_rpt(up) && up->parent
&& !I_am_RP(pim, up->sg.grp)) {
if (PIM_DEBUG_PIM_TRACE_DETAIL)
zlog_debug(
"%s: *,G IIF %s S,G IIF %s ",
__PRETTY_FUNCTION__,
up->parent->rpf.source_nexthop
.interface->name,
up->rpf.source_nexthop.interface->name);
pim_jp_agg_single_upstream_send(&up->parent->rpf,
up->parent,
1 /* (W,G) Join */);
} else
pim_jp_agg_single_upstream_send(&up->rpf, up,
0 /* prune */);
join_timer_stop(up);
}
}
int pim_upstream_compare(void *arg1, void *arg2)
{
const struct pim_upstream *up1 = (const struct pim_upstream *)arg1;
const struct pim_upstream *up2 = (const struct pim_upstream *)arg2;
if (ntohl(up1->sg.grp.s_addr) < ntohl(up2->sg.grp.s_addr))
return -1;
if (ntohl(up1->sg.grp.s_addr) > ntohl(up2->sg.grp.s_addr))
return 1;
if (ntohl(up1->sg.src.s_addr) < ntohl(up2->sg.src.s_addr))
return -1;
if (ntohl(up1->sg.src.s_addr) > ntohl(up2->sg.src.s_addr))
return 1;
return 0;
}
static struct pim_upstream *pim_upstream_new(struct pim_instance *pim,
struct prefix_sg *sg,
struct interface *incoming,
int flags,
struct pim_ifchannel *ch)
{
enum pim_rpf_result rpf_result;
struct pim_interface *pim_ifp;
struct pim_upstream *up;
up = XCALLOC(MTYPE_PIM_UPSTREAM, sizeof(*up));
if (!up) {
zlog_err("%s: PIM XCALLOC(%zu) failure", __PRETTY_FUNCTION__,
sizeof(*up));
return NULL;
}
up->sg = *sg;
pim_str_sg_set(sg, up->sg_str);
if (ch)
ch->upstream = up;
up = hash_get(pim->upstream_hash, up, hash_alloc_intern);
if (!pim_rp_set_upstream_addr(pim, &up->upstream_addr, sg->src,
sg->grp)) {
if (PIM_DEBUG_TRACE)
zlog_debug("%s: Received a (*,G) with no RP configured",
__PRETTY_FUNCTION__);
hash_release(pim->upstream_hash, up);
XFREE(MTYPE_PIM_UPSTREAM, up);
return NULL;
}
up->parent = pim_upstream_find_parent(pim, up);
if (up->sg.src.s_addr == INADDR_ANY) {
up->sources = list_new();
up->sources->cmp = pim_upstream_compare;
} else
up->sources = NULL;
pim_upstream_find_new_children(pim, up);
up->flags = flags;
up->ref_count = 1;
up->t_join_timer = NULL;
up->t_ka_timer = NULL;
up->t_rs_timer = NULL;
up->t_msdp_reg_timer = NULL;
up->join_state = PIM_UPSTREAM_NOTJOINED;
up->reg_state = PIM_REG_NOINFO;
up->state_transition = pim_time_monotonic_sec();
up->channel_oil = NULL;
up->sptbit = PIM_UPSTREAM_SPTBIT_FALSE;
up->rpf.source_nexthop.interface = NULL;
up->rpf.source_nexthop.mrib_nexthop_addr.family = AF_INET;
up->rpf.source_nexthop.mrib_nexthop_addr.u.prefix4.s_addr =
PIM_NET_INADDR_ANY;
up->rpf.source_nexthop.mrib_metric_preference =
qpim_infinite_assert_metric.metric_preference;
up->rpf.source_nexthop.mrib_route_metric =
qpim_infinite_assert_metric.route_metric;
up->rpf.rpf_addr.family = AF_INET;
up->rpf.rpf_addr.u.prefix4.s_addr = PIM_NET_INADDR_ANY;
up->ifchannels = list_new();
up->ifchannels->cmp = (int (*)(void *, void *))pim_ifchannel_compare;
if (up->sg.src.s_addr != INADDR_ANY)
wheel_add_item(pim->upstream_sg_wheel, up);
rpf_result = pim_rpf_update(pim, up, NULL, 1);
if (rpf_result == PIM_RPF_FAILURE) {
struct prefix nht_p;
if (PIM_DEBUG_TRACE)
zlog_debug(
"%s: Attempting to create upstream(%s), Unable to RPF for source",
__PRETTY_FUNCTION__, up->sg_str);
nht_p.family = AF_INET;
nht_p.prefixlen = IPV4_MAX_BITLEN;
nht_p.u.prefix4 = up->upstream_addr;
pim_delete_tracked_nexthop(pim, &nht_p, up, NULL);
if (up->parent) {
listnode_delete(up->parent->sources, up);
up->parent = NULL;
}
if (up->sg.src.s_addr != INADDR_ANY)
wheel_remove_item(pim->upstream_sg_wheel, up);
pim_upstream_remove_children(pim, up);
if (up->sources)
list_delete_and_null(&up->sources);
list_delete_and_null(&up->ifchannels);
hash_release(pim->upstream_hash, up);
XFREE(MTYPE_PIM_UPSTREAM, up);
return NULL;
}
if (up->rpf.source_nexthop.interface) {
pim_ifp = up->rpf.source_nexthop.interface->info;
if (pim_ifp)
up->channel_oil = pim_channel_oil_add(
pim, &up->sg, pim_ifp->mroute_vif_index);
}
listnode_add_sort(pim->upstream_list, up);
if (PIM_DEBUG_TRACE) {
zlog_debug(
"%s: Created Upstream %s upstream_addr %s ref count %d increment",
__PRETTY_FUNCTION__, up->sg_str,
inet_ntoa(up->upstream_addr), up->ref_count);
}
return up;
}
struct pim_upstream *pim_upstream_find(struct pim_instance *pim,
struct prefix_sg *sg)
{
struct pim_upstream lookup;
struct pim_upstream *up = NULL;
lookup.sg = *sg;
up = hash_lookup(pim->upstream_hash, &lookup);
return up;
}
struct pim_upstream *pim_upstream_find_or_add(struct prefix_sg *sg,
struct interface *incoming,
int flags, const char *name)
{
struct pim_upstream *up;
struct pim_interface *pim_ifp;
pim_ifp = incoming->info;
up = pim_upstream_find(pim_ifp->pim, sg);
if (up) {
if (!(up->flags & flags)) {
up->flags |= flags;
up->ref_count++;
if (PIM_DEBUG_TRACE)
zlog_debug(
"%s(%s): upstream %s ref count %d increment",
__PRETTY_FUNCTION__, name, up->sg_str,
up->ref_count);
}
} else
up = pim_upstream_add(pim_ifp->pim, sg, incoming, flags, name,
NULL);
return up;
}
void pim_upstream_ref(struct pim_upstream *up, int flags, const char *name)
{
up->flags |= flags;
++up->ref_count;
if (PIM_DEBUG_TRACE)
zlog_debug("%s(%s): upstream %s ref count %d increment",
__PRETTY_FUNCTION__, name, up->sg_str,
up->ref_count);
}
struct pim_upstream *pim_upstream_add(struct pim_instance *pim,
struct prefix_sg *sg,
struct interface *incoming, int flags,
const char *name,
struct pim_ifchannel *ch)
{
struct pim_upstream *up = NULL;
int found = 0;
up = pim_upstream_find(pim, sg);
if (up) {
pim_upstream_ref(up, flags, name);
found = 1;
} else {
up = pim_upstream_new(pim, sg, incoming, flags, ch);
}
if (PIM_DEBUG_TRACE) {
if (up) {
char buf[PREFIX2STR_BUFFER];
prefix2str(&up->rpf.rpf_addr, buf, sizeof(buf));
zlog_debug("%s(%s): %s, iif %s (%s) found: %d: ref_count: %d",
__PRETTY_FUNCTION__, name,
up->sg_str, buf, up->rpf.source_nexthop.interface ?
up->rpf.source_nexthop.interface->name : "NIL" ,
found, up->ref_count);
} else
zlog_debug("%s(%s): (%s) failure to create",
__PRETTY_FUNCTION__, name,
pim_str_sg_dump(sg));
}
return up;
}
/*
* Passed in up must be the upstream for ch. starch is NULL if no
* information
*/
int pim_upstream_evaluate_join_desired_interface(struct pim_upstream *up,
struct pim_ifchannel *ch,
struct pim_ifchannel *starch)
{
if (ch) {
if (PIM_IF_FLAG_TEST_S_G_RPT(ch->flags))
return 0;
if (!pim_macro_ch_lost_assert(ch)
&& pim_macro_chisin_joins_or_include(ch))
return 1;
}
/*
* joins (*,G)
*/
if (starch) {
if (PIM_IF_FLAG_TEST_S_G_RPT(starch->upstream->flags))
return 0;
if (!pim_macro_ch_lost_assert(starch)
&& pim_macro_chisin_joins_or_include(starch))
return 1;
}
return 0;
}
/*
Evaluate JoinDesired(S,G):
JoinDesired(S,G) is true if there is a downstream (S,G) interface I
in the set:
inherited_olist(S,G) =
joins(S,G) (+) pim_include(S,G) (-) lost_assert(S,G)
JoinDesired(S,G) may be affected by changes in the following:
pim_ifp->primary_address
pim_ifp->pim_dr_addr
ch->ifassert_winner_metric
ch->ifassert_winner
ch->local_ifmembership
ch->ifjoin_state
ch->upstream->rpf.source_nexthop.mrib_metric_preference
ch->upstream->rpf.source_nexthop.mrib_route_metric
ch->upstream->rpf.source_nexthop.interface
See also pim_upstream_update_join_desired() below.
*/
int pim_upstream_evaluate_join_desired(struct pim_instance *pim,
struct pim_upstream *up)
{
struct interface *ifp;
struct pim_ifchannel *ch, *starch;
struct pim_upstream *starup = up->parent;
int ret = 0;
FOR_ALL_INTERFACES (pim->vrf, ifp) {
if (!ifp->info)
continue;
ch = pim_ifchannel_find(ifp, &up->sg);
if (starup)
starch = pim_ifchannel_find(ifp, &starup->sg);
else
starch = NULL;
if (!ch && !starch)
continue;
ret += pim_upstream_evaluate_join_desired_interface(up, ch,
starch);
} /* scan iface channel list */
return ret; /* false */
}
/*
See also pim_upstream_evaluate_join_desired() above.
*/
void pim_upstream_update_join_desired(struct pim_instance *pim,
struct pim_upstream *up)
{
int was_join_desired; /* boolean */
int is_join_desired; /* boolean */
was_join_desired = PIM_UPSTREAM_FLAG_TEST_DR_JOIN_DESIRED(up->flags);
is_join_desired = pim_upstream_evaluate_join_desired(pim, up);
if (is_join_desired)
PIM_UPSTREAM_FLAG_SET_DR_JOIN_DESIRED(up->flags);
else
PIM_UPSTREAM_FLAG_UNSET_DR_JOIN_DESIRED(up->flags);
/* switched from false to true */
if (is_join_desired && !was_join_desired) {
pim_upstream_switch(pim, up, PIM_UPSTREAM_JOINED);
return;
}
/* switched from true to false */
if (!is_join_desired && was_join_desired) {
pim_upstream_switch(pim, up, PIM_UPSTREAM_NOTJOINED);
return;
}
}
/*
RFC 4601 4.5.7. Sending (S,G) Join/Prune Messages
Transitions from Joined State
RPF'(S,G) GenID changes
The upstream (S,G) state machine remains in Joined state. If the
Join Timer is set to expire in more than t_override seconds, reset
it so that it expires after t_override seconds.
*/
void pim_upstream_rpf_genid_changed(struct pim_instance *pim,
struct in_addr neigh_addr)
{
struct listnode *up_node;
struct listnode *up_nextnode;
struct pim_upstream *up;
/*
* Scan all (S,G) upstreams searching for RPF'(S,G)=neigh_addr
*/
for (ALL_LIST_ELEMENTS(pim->upstream_list, up_node, up_nextnode, up)) {
if (PIM_DEBUG_TRACE) {
char neigh_str[INET_ADDRSTRLEN];
char rpf_addr_str[PREFIX_STRLEN];
pim_inet4_dump("<neigh?>", neigh_addr, neigh_str,
sizeof(neigh_str));
pim_addr_dump("<rpf?>", &up->rpf.rpf_addr, rpf_addr_str,
sizeof(rpf_addr_str));
zlog_debug(
"%s: matching neigh=%s against upstream (S,G)=%s[%s] joined=%d rpf_addr=%s",
__PRETTY_FUNCTION__, neigh_str, up->sg_str,
pim->vrf->name,
up->join_state == PIM_UPSTREAM_JOINED,
rpf_addr_str);
}
/* consider only (S,G) upstream in Joined state */
if (up->join_state != PIM_UPSTREAM_JOINED)
continue;
/* match RPF'(S,G)=neigh_addr */
if (up->rpf.rpf_addr.u.prefix4.s_addr != neigh_addr.s_addr)
continue;
pim_upstream_join_timer_decrease_to_t_override(
"RPF'(S,G) GenID change", up);
}
}
void pim_upstream_rpf_interface_changed(struct pim_upstream *up,
struct interface *old_rpf_ifp)
{
struct listnode *chnode;
struct listnode *chnextnode;
struct pim_ifchannel *ch;
/* search all ifchannels */
for (ALL_LIST_ELEMENTS(up->ifchannels, chnode, chnextnode, ch)) {
if (ch->ifassert_state == PIM_IFASSERT_I_AM_LOSER) {
if (
/* RPF_interface(S) was NOT I */
(old_rpf_ifp == ch->interface) &&
/* RPF_interface(S) stopped being I */
(ch->upstream->rpf.source_nexthop
.interface != ch->interface)) {
assert_action_a5(ch);
}
} /* PIM_IFASSERT_I_AM_LOSER */
pim_ifchannel_update_assert_tracking_desired(ch);
}
}
void pim_upstream_update_could_assert(struct pim_upstream *up)
{
struct listnode *chnode;
struct listnode *chnextnode;
struct pim_ifchannel *ch;
/* scan per-interface (S,G) state */
for (ALL_LIST_ELEMENTS(up->ifchannels, chnode, chnextnode, ch)) {
pim_ifchannel_update_could_assert(ch);
} /* scan iface channel list */
}
void pim_upstream_update_my_assert_metric(struct pim_upstream *up)
{
struct listnode *chnode;
struct listnode *chnextnode;