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pim_ifchannel.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PIM for Quagga
* Copyright (C) 2008 Everton da Silva Marques
*/
#include <zebra.h>
#include "linklist.h"
#include "frrevent.h"
#include "memory.h"
#include "if.h"
#include "vrf.h"
#include "hash.h"
#include "jhash.h"
#include "prefix.h"
#include "pimd.h"
#include "pim_instance.h"
#include "pim_str.h"
#include "pim_iface.h"
#include "pim_ifchannel.h"
#include "pim_zebra.h"
#include "pim_time.h"
#include "pim_msg.h"
#include "pim_pim.h"
#include "pim_join.h"
#include "pim_rpf.h"
#include "pim_macro.h"
#include "pim_oil.h"
#include "pim_upstream.h"
#include "pim_ssm.h"
#include "pim_rp.h"
#include "pim_mlag.h"
RB_GENERATE(pim_ifchannel_rb, pim_ifchannel, pim_ifp_rb, pim_ifchannel_compare);
int pim_ifchannel_compare(const struct pim_ifchannel *ch1,
const struct pim_ifchannel *ch2)
{
struct pim_interface *pim_ifp1;
struct pim_interface *pim_ifp2;
pim_ifp1 = ch1->interface->info;
pim_ifp2 = ch2->interface->info;
if (pim_ifp1->mroute_vif_index < pim_ifp2->mroute_vif_index)
return -1;
if (pim_ifp1->mroute_vif_index > pim_ifp2->mroute_vif_index)
return 1;
return pim_sgaddr_cmp(ch1->sg, ch2->sg);
}
/*
* A (*,G) or a (*,*) is going away
* remove the parent pointer from
* those pointing at us
*/
static void pim_ifchannel_remove_children(struct pim_ifchannel *ch)
{
struct pim_ifchannel *child;
if (!ch->sources)
return;
while (!list_isempty(ch->sources)) {
child = listnode_head(ch->sources);
child->parent = NULL;
listnode_delete(ch->sources, child);
}
}
/*
* A (*,G) or a (*,*) is being created
* find all the children that would point
* at us.
*/
static void pim_ifchannel_find_new_children(struct pim_ifchannel *ch)
{
struct pim_interface *pim_ifp = ch->interface->info;
struct pim_ifchannel *child;
// Basic Sanity that we are not being silly
if (!pim_addr_is_any(ch->sg.src) && !pim_addr_is_any(ch->sg.grp))
return;
if (pim_addr_is_any(ch->sg.src) && pim_addr_is_any(ch->sg.grp))
return;
RB_FOREACH (child, pim_ifchannel_rb, &pim_ifp->ifchannel_rb) {
if (!pim_addr_is_any(ch->sg.grp) &&
!pim_addr_cmp(child->sg.grp, ch->sg.grp) && (child != ch)) {
child->parent = ch;
listnode_add_sort(ch->sources, child);
}
}
}
void pim_ifchannel_delete(struct pim_ifchannel *ch)
{
struct pim_interface *pim_ifp;
struct pim_upstream *up;
pim_ifp = ch->interface->info;
if (PIM_DEBUG_PIM_TRACE)
zlog_debug("%s: ifchannel entry %s(%s) del start", __func__,
ch->sg_str, ch->interface->name);
if (PIM_I_am_DualActive(pim_ifp)) {
if (PIM_DEBUG_MLAG)
zlog_debug(
"%s: if-chnanel-%s is deleted from a Dual active Interface",
__func__, ch->sg_str);
/* Post Delete only if it is the last Dual-active Interface */
if (ch->upstream->dualactive_ifchannel_count == 1) {
pim_mlag_up_local_del(pim_ifp->pim, ch->upstream);
PIM_UPSTREAM_FLAG_UNSET_MLAG_INTERFACE(
ch->upstream->flags);
}
ch->upstream->dualactive_ifchannel_count--;
}
if (ch->upstream->channel_oil) {
uint32_t mask = PIM_OIF_FLAG_PROTO_PIM;
if (ch->upstream->flags & PIM_UPSTREAM_FLAG_MASK_SRC_IGMP)
mask |= PIM_OIF_FLAG_PROTO_GM;
/*
* A S,G RPT channel can have an empty oil, we also
* need to take into account the fact that a ifchannel
* might have been suppressing a *,G ifchannel from
* being inherited. So let's figure out what
* needs to be done here
*/
if (!pim_addr_is_any(ch->sg.src) && ch->parent &&
pim_upstream_evaluate_join_desired_interface(
ch->upstream, ch, ch->parent))
pim_channel_add_oif(ch->upstream->channel_oil,
ch->interface,
PIM_OIF_FLAG_PROTO_STAR,
__func__);
pim_channel_del_oif(ch->upstream->channel_oil,
ch->interface, mask, __func__);
/*
* Do we have any S,G's that are inheriting?
* Nuke from on high too.
*/
if (ch->upstream->sources) {
struct pim_upstream *child;
struct listnode *up_node;
for (ALL_LIST_ELEMENTS_RO(ch->upstream->sources,
up_node, child))
pim_channel_del_inherited_oif(
child->channel_oil,
ch->interface,
__func__);
}
}
/*
* When this channel is removed
* we need to find all our children
* and make sure our pointers are fixed
*/
pim_ifchannel_remove_children(ch);
if (ch->sources)
list_delete(&ch->sources);
listnode_delete(ch->upstream->ifchannels, ch);
up = ch->upstream;
/* upstream is common across ifchannels, check if upstream's
ifchannel list is empty before deleting upstream_del
ref count will take care of it.
*/
if (ch->upstream->ref_count > 0)
up = pim_upstream_del(pim_ifp->pim, ch->upstream, __func__);
else {
if (PIM_DEBUG_PIM_TRACE)
zlog_debug(
"%s: Avoiding deletion of upstream with ref_count %d from ifchannel(%s): %s",
__func__, ch->upstream->ref_count,
ch->interface->name, ch->sg_str);
}
ch->upstream = NULL;
EVENT_OFF(ch->t_ifjoin_expiry_timer);
EVENT_OFF(ch->t_ifjoin_prune_pending_timer);
EVENT_OFF(ch->t_ifassert_timer);
if (ch->parent) {
listnode_delete(ch->parent->sources, ch);
ch->parent = NULL;
}
RB_REMOVE(pim_ifchannel_rb, &pim_ifp->ifchannel_rb, ch);
if (PIM_DEBUG_PIM_TRACE)
zlog_debug("%s: ifchannel entry %s(%s) is deleted ", __func__,
ch->sg_str, ch->interface->name);
XFREE(MTYPE_PIM_IFCHANNEL, ch);
if (up)
pim_upstream_update_join_desired(pim_ifp->pim, up);
}
void pim_ifchannel_delete_all(struct interface *ifp)
{
struct pim_interface *pim_ifp;
struct pim_ifchannel *ch;
pim_ifp = ifp->info;
if (!pim_ifp)
return;
while (!RB_EMPTY(pim_ifchannel_rb, &pim_ifp->ifchannel_rb)) {
ch = RB_ROOT(pim_ifchannel_rb, &pim_ifp->ifchannel_rb);
pim_ifchannel_ifjoin_switch(__func__, ch, PIM_IFJOIN_NOINFO);
pim_ifchannel_delete(ch);
}
}
void delete_on_noinfo(struct pim_ifchannel *ch)
{
if (ch->local_ifmembership == PIM_IFMEMBERSHIP_NOINFO
&& ch->ifjoin_state == PIM_IFJOIN_NOINFO
&& ch->t_ifjoin_expiry_timer == NULL)
pim_ifchannel_delete(ch);
}
void pim_ifchannel_ifjoin_switch(const char *caller, struct pim_ifchannel *ch,
enum pim_ifjoin_state new_state)
{
enum pim_ifjoin_state old_state = ch->ifjoin_state;
struct pim_interface *pim_ifp = ch->interface->info;
struct pim_ifchannel *child_ch;
if (PIM_DEBUG_PIM_EVENTS)
zlog_debug(
"PIM_IFCHANNEL(%s): %s is switching from %s to %s",
ch->interface->name, ch->sg_str,
pim_ifchannel_ifjoin_name(ch->ifjoin_state, ch->flags),
pim_ifchannel_ifjoin_name(new_state, 0));
if (old_state == new_state) {
if (PIM_DEBUG_PIM_EVENTS) {
zlog_debug(
"%s called by %s: non-transition on state %d (%s)",
__func__, caller, new_state,
pim_ifchannel_ifjoin_name(new_state, 0));
}
return;
}
ch->ifjoin_state = new_state;
if (pim_addr_is_any(ch->sg.src)) {
struct pim_upstream *up = ch->upstream;
struct pim_upstream *child;
struct listnode *up_node;
if (up) {
if (ch->ifjoin_state == PIM_IFJOIN_NOINFO) {
for (ALL_LIST_ELEMENTS_RO(up->sources, up_node,
child)) {
struct channel_oil *c_oil =
child->channel_oil;
if (PIM_DEBUG_PIM_TRACE)
zlog_debug(
"%s %s: Prune(S,G)=%s from %s",
__FILE__, __func__,
child->sg_str,
up->sg_str);
if (!c_oil)
continue;
/*
* If the S,G has no if channel and the
* c_oil still
* has output here then the *,G was
* supplying the implied
* if channel. So remove it.
*/
if (oil_if_has(c_oil,
pim_ifp->mroute_vif_index))
pim_channel_del_inherited_oif(
c_oil, ch->interface,
__func__);
}
}
if (ch->ifjoin_state == PIM_IFJOIN_JOIN) {
for (ALL_LIST_ELEMENTS_RO(up->sources, up_node,
child)) {
if (PIM_DEBUG_PIM_TRACE)
zlog_debug(
"%s %s: Join(S,G)=%s from %s",
__FILE__, __func__,
child->sg_str,
up->sg_str);
/* check if the channel can be
* inherited into the SG's OIL
*/
child_ch = pim_ifchannel_find(
ch->interface,
&child->sg);
if (pim_upstream_eval_inherit_if(
child, child_ch, ch)) {
pim_channel_add_oif(
child->channel_oil,
ch->interface,
PIM_OIF_FLAG_PROTO_STAR,
__func__);
pim_upstream_update_join_desired(
pim_ifp->pim, child);
}
}
}
}
}
/* Transition to/from NOINFO ? */
if ((old_state == PIM_IFJOIN_NOINFO)
|| (new_state == PIM_IFJOIN_NOINFO)) {
if (PIM_DEBUG_PIM_EVENTS) {
zlog_debug("PIM_IFCHANNEL_%s: (S,G)=%s on interface %s",
((new_state == PIM_IFJOIN_NOINFO) ? "DOWN"
: "UP"),
ch->sg_str, ch->interface->name);
}
/* pim_upstream_update_join_desired looks at up->channel_oil,
* but that's updated from pim_forward_stop(). Need this here
* so we correctly determine join_desired right below.
*/
if (new_state == PIM_IFJOIN_NOINFO)
pim_forward_stop(ch);
/*
Record uptime of state transition to/from NOINFO
*/
ch->ifjoin_creation = pim_time_monotonic_sec();
pim_upstream_update_join_desired(pim_ifp->pim, ch->upstream);
pim_ifchannel_update_could_assert(ch);
pim_ifchannel_update_assert_tracking_desired(ch);
}
}
const char *pim_ifchannel_ifjoin_name(enum pim_ifjoin_state ifjoin_state,
int flags)
{
switch (ifjoin_state) {
case PIM_IFJOIN_NOINFO:
if (PIM_IF_FLAG_TEST_S_G_RPT(flags))
return "SGRpt(NI)";
else
return "NOINFO";
case PIM_IFJOIN_JOIN:
return "JOIN";
case PIM_IFJOIN_PRUNE:
if (PIM_IF_FLAG_TEST_S_G_RPT(flags))
return "SGRpt(P)";
else
return "PRUNE";
case PIM_IFJOIN_PRUNE_PENDING:
if (PIM_IF_FLAG_TEST_S_G_RPT(flags))
return "SGRpt(PP)";
else
return "PRUNEP";
case PIM_IFJOIN_PRUNE_TMP:
if (PIM_IF_FLAG_TEST_S_G_RPT(flags))
return "SGRpt(P')";
else
return "PRUNET";
case PIM_IFJOIN_PRUNE_PENDING_TMP:
if (PIM_IF_FLAG_TEST_S_G_RPT(flags))
return "SGRpt(PP')";
else
return "PRUNEPT";
}
return "ifjoin_bad_state";
}
const char *pim_ifchannel_ifassert_name(enum pim_ifassert_state ifassert_state)
{
switch (ifassert_state) {
case PIM_IFASSERT_NOINFO:
return "NOINFO";
case PIM_IFASSERT_I_AM_WINNER:
return "WINNER";
case PIM_IFASSERT_I_AM_LOSER:
return "LOSER";
}
return "ifassert_bad_state";
}
/*
RFC 4601: 4.6.5. Assert State Macros
AssertWinner(S,G,I) defaults to NULL and AssertWinnerMetric(S,G,I)
defaults to Infinity when in the NoInfo state.
*/
void reset_ifassert_state(struct pim_ifchannel *ch)
{
EVENT_OFF(ch->t_ifassert_timer);
pim_ifassert_winner_set(ch, PIM_IFASSERT_NOINFO, PIMADDR_ANY,
router->infinite_assert_metric);
}
struct pim_ifchannel *pim_ifchannel_find(struct interface *ifp, pim_sgaddr *sg)
{
struct pim_interface *pim_ifp;
struct pim_ifchannel *ch;
struct pim_ifchannel lookup;
pim_ifp = ifp->info;
if (!pim_ifp) {
zlog_warn("%s: (S,G)=%pSG: multicast not enabled on interface %s",
__func__, sg, ifp->name);
return NULL;
}
lookup.sg = *sg;
lookup.interface = ifp;
ch = RB_FIND(pim_ifchannel_rb, &pim_ifp->ifchannel_rb, &lookup);
return ch;
}
static void ifmembership_set(struct pim_ifchannel *ch,
enum pim_ifmembership membership)
{
struct pim_interface *pim_ifp = ch->interface->info;
if (ch->local_ifmembership == membership)
return;
if (PIM_DEBUG_PIM_EVENTS) {
zlog_debug("%s: (S,G)=%s membership now is %s on interface %s",
__func__, ch->sg_str,
membership == PIM_IFMEMBERSHIP_INCLUDE ? "INCLUDE"
: "NOINFO",
ch->interface->name);
}
ch->local_ifmembership = membership;
pim_upstream_update_join_desired(pim_ifp->pim, ch->upstream);
pim_ifchannel_update_could_assert(ch);
pim_ifchannel_update_assert_tracking_desired(ch);
}
void pim_ifchannel_membership_clear(struct interface *ifp)
{
struct pim_interface *pim_ifp;
struct pim_ifchannel *ch;
pim_ifp = ifp->info;
assert(pim_ifp);
RB_FOREACH (ch, pim_ifchannel_rb, &pim_ifp->ifchannel_rb)
ifmembership_set(ch, PIM_IFMEMBERSHIP_NOINFO);
}
void pim_ifchannel_delete_on_noinfo(struct interface *ifp)
{
struct pim_interface *pim_ifp;
struct pim_ifchannel *ch, *ch_tmp;
pim_ifp = ifp->info;
assert(pim_ifp);
RB_FOREACH_SAFE (ch, pim_ifchannel_rb, &pim_ifp->ifchannel_rb, ch_tmp)
delete_on_noinfo(ch);
}
/*
* For a given Interface, if we are given a S,G
* Find the *,G (If we have it).
* If we are passed a *,G, find the *,* ifchannel
* if we have it.
*/
static struct pim_ifchannel *pim_ifchannel_find_parent(struct pim_ifchannel *ch)
{
pim_sgaddr parent_sg = ch->sg;
struct pim_ifchannel *parent = NULL;
// (S,G)
if (!pim_addr_is_any(parent_sg.src) &&
!pim_addr_is_any(parent_sg.grp)) {
parent_sg.src = PIMADDR_ANY;
parent = pim_ifchannel_find(ch->interface, &parent_sg);
if (parent)
listnode_add(parent->sources, ch);
return parent;
}
return NULL;
}
struct pim_ifchannel *pim_ifchannel_add(struct interface *ifp, pim_sgaddr *sg,
uint8_t source_flags, int up_flags)
{
struct pim_interface *pim_ifp;
struct pim_ifchannel *ch;
struct pim_upstream *up;
ch = pim_ifchannel_find(ifp, sg);
if (ch) {
if (up_flags == PIM_UPSTREAM_FLAG_MASK_SRC_PIM)
PIM_IF_FLAG_SET_PROTO_PIM(ch->flags);
if (up_flags == PIM_UPSTREAM_FLAG_MASK_SRC_IGMP)
PIM_IF_FLAG_SET_PROTO_IGMP(ch->flags);
ch->upstream->flags |= up_flags;
return ch;
}
pim_ifp = ifp->info;
ch = XCALLOC(MTYPE_PIM_IFCHANNEL, sizeof(*ch));
ch->flags = 0;
if ((source_flags & PIM_ENCODE_RPT_BIT)
&& !(source_flags & PIM_ENCODE_WC_BIT))
PIM_IF_FLAG_SET_S_G_RPT(ch->flags);
ch->interface = ifp;
ch->sg = *sg;
snprintfrr(ch->sg_str, sizeof(ch->sg_str), "%pSG", sg);
ch->parent = pim_ifchannel_find_parent(ch);
if (pim_addr_is_any(ch->sg.src)) {
ch->sources = list_new();
ch->sources->cmp =
(int (*)(void *, void *))pim_ifchannel_compare;
} else
ch->sources = NULL;
pim_ifchannel_find_new_children(ch);
ch->local_ifmembership = PIM_IFMEMBERSHIP_NOINFO;
ch->ifjoin_state = PIM_IFJOIN_NOINFO;
ch->t_ifjoin_expiry_timer = NULL;
ch->t_ifjoin_prune_pending_timer = NULL;
ch->ifjoin_creation = 0;
RB_INSERT(pim_ifchannel_rb, &pim_ifp->ifchannel_rb, ch);
up = pim_upstream_add(pim_ifp->pim, sg, NULL, up_flags, __func__, ch);
ch->upstream = up;
listnode_add_sort(up->ifchannels, ch);
ch->ifassert_my_metric = pim_macro_ch_my_assert_metric_eval(ch);
ch->ifassert_winner_metric = pim_macro_ch_my_assert_metric_eval(ch);
ch->ifassert_winner = PIMADDR_ANY;
/* Assert state */
ch->t_ifassert_timer = NULL;
ch->ifassert_state = PIM_IFASSERT_NOINFO;
reset_ifassert_state(ch);
if (pim_macro_ch_could_assert_eval(ch))
PIM_IF_FLAG_SET_COULD_ASSERT(ch->flags);
else
PIM_IF_FLAG_UNSET_COULD_ASSERT(ch->flags);
if (pim_macro_assert_tracking_desired_eval(ch))
PIM_IF_FLAG_SET_ASSERT_TRACKING_DESIRED(ch->flags);
else
PIM_IF_FLAG_UNSET_ASSERT_TRACKING_DESIRED(ch->flags);
/*
* advertise MLAG Data to MLAG peer
*/
if (PIM_I_am_DualActive(pim_ifp)) {
up->dualactive_ifchannel_count++;
/* Sync once for upstream */
if (up->dualactive_ifchannel_count == 1) {
PIM_UPSTREAM_FLAG_SET_MLAG_INTERFACE(up->flags);
pim_mlag_up_local_add(pim_ifp->pim, up);
}
if (PIM_DEBUG_MLAG)
zlog_debug(
"%s: New Dual active if-chnanel is added to upstream:%s count:%d, flags:0x%x",
__func__, up->sg_str,
up->dualactive_ifchannel_count, up->flags);
}
if (up_flags == PIM_UPSTREAM_FLAG_MASK_SRC_PIM)
PIM_IF_FLAG_SET_PROTO_PIM(ch->flags);
if (up_flags == PIM_UPSTREAM_FLAG_MASK_SRC_IGMP)
PIM_IF_FLAG_SET_PROTO_IGMP(ch->flags);
if (PIM_DEBUG_PIM_TRACE)
zlog_debug("%s: ifchannel %s(%s) is created ", __func__,
ch->sg_str, ch->interface->name);
return ch;
}
static void ifjoin_to_noinfo(struct pim_ifchannel *ch)
{
pim_ifchannel_ifjoin_switch(__func__, ch, PIM_IFJOIN_NOINFO);
PIM_UPSTREAM_FLAG_UNSET_SRC_PIM(ch->upstream->flags);
PIM_IF_FLAG_UNSET_PROTO_PIM(ch->flags);
delete_on_noinfo(ch);
}
static void on_ifjoin_expiry_timer(struct event *t)
{
struct pim_ifchannel *ch;
ch = EVENT_ARG(t);
if (PIM_DEBUG_PIM_TRACE)
zlog_debug("%s: ifchannel %s expiry timer", __func__,
ch->sg_str);
ifjoin_to_noinfo(ch);
/* ch may have been deleted */
}
static void on_ifjoin_prune_pending_timer(struct event *t)
{
struct pim_ifchannel *ch;
int send_prune_echo; /* boolean */
struct interface *ifp;
struct pim_interface *pim_ifp;
ch = EVENT_ARG(t);
if (PIM_DEBUG_PIM_TRACE)
zlog_debug("%s: IFCHANNEL%pSG %s Prune Pending Timer Popped",
__func__, &ch->sg,
pim_ifchannel_ifjoin_name(ch->ifjoin_state, ch->flags));
if (ch->ifjoin_state == PIM_IFJOIN_PRUNE_PENDING) {
ifp = ch->interface;
pim_ifp = ifp->info;
if (!PIM_IF_FLAG_TEST_S_G_RPT(ch->flags)) {
/* Send PruneEcho(S,G) ? */
send_prune_echo =
(listcount(pim_ifp->pim_neighbor_list) > 1);
if (send_prune_echo) {
struct pim_rpf rpf;
rpf.source_nexthop.interface = ifp;
rpf.rpf_addr = pim_ifp->primary_address;
pim_jp_agg_single_upstream_send(
&rpf, ch->upstream, 0);
}
ifjoin_to_noinfo(ch);
} else {
/* If SGRpt flag is set on ifchannel, Trigger SGRpt
* message on RP path upon prune timer expiry.
*/
ch->ifjoin_state = PIM_IFJOIN_PRUNE;
struct pim_upstream *parent =
ch->upstream->parent;
pim_upstream_update_join_desired(pim_ifp->pim,
ch->upstream);
pim_jp_agg_single_upstream_send(&parent->rpf,
parent, true);
/*
* SGRpt prune pending expiry has to install
* SG entry with empty olist to drop the SG
* traffic incase no other intf exists.
* On that scenario, SG entry wouldn't have
* got installed until Prune pending timer
* expired. So install now.
*/
pim_channel_del_oif(
ch->upstream->channel_oil, ifp,
PIM_OIF_FLAG_PROTO_STAR, __func__);
pim_channel_del_oif(ch->upstream->channel_oil, ifp,
PIM_OIF_FLAG_PROTO_PIM, __func__);
if (!ch->upstream->channel_oil->installed)
pim_upstream_mroute_add(
ch->upstream->channel_oil,
__func__);
}
/* from here ch may have been deleted */
}
}
static void check_recv_upstream(int is_join, struct interface *recv_ifp,
pim_addr upstream, pim_sgaddr *sg,
uint8_t source_flags, int holdtime)
{
struct pim_upstream *up;
struct pim_interface *pim_ifp = recv_ifp->info;
pim_addr rpf_addr;
/* Upstream (S,G) in Joined state ? */
up = pim_upstream_find(pim_ifp->pim, sg);
if (!up)
return;
if (up->join_state != PIM_UPSTREAM_JOINED)
return;
/* Upstream (S,G) in Joined state */
if (pim_rpf_addr_is_inaddr_any(&up->rpf)) {
/* RPF'(S,G) not found */
zlog_warn("%s %s: RPF'%s not found", __FILE__, __func__,
up->sg_str);
return;
}
rpf_addr = up->rpf.rpf_addr;
/* upstream directed to RPF'(S,G) ? */
if (pim_addr_cmp(upstream, rpf_addr)) {
zlog_warn(
"%s %s: (S,G)=%s upstream=%pPAs not directed to RPF'(S,G)=%pPAs on interface %s",
__FILE__, __func__, up->sg_str, &upstream, &rpf_addr,
recv_ifp->name);
return;
}
/* upstream directed to RPF'(S,G) */
if (is_join) {
/* Join(S,G) to RPF'(S,G) */
pim_upstream_join_suppress(up, up->rpf.rpf_addr, holdtime);
return;
}
/* Prune to RPF'(S,G) */
if (source_flags & PIM_RPT_BIT_MASK) {
if (source_flags & PIM_WILDCARD_BIT_MASK) {
/* Prune(*,G) to RPF'(S,G) */
pim_upstream_join_timer_decrease_to_t_override(
"Prune(*,G)", up);
return;
}
/* Prune(S,G,rpt) to RPF'(S,G) */
pim_upstream_join_timer_decrease_to_t_override("Prune(S,G,rpt)",
up);
return;
}
/* Prune(S,G) to RPF'(S,G) */
pim_upstream_join_timer_decrease_to_t_override("Prune(S,G)", up);
}
static int nonlocal_upstream(int is_join, struct interface *recv_ifp,
pim_addr upstream, pim_sgaddr *sg,
uint8_t source_flags, uint16_t holdtime)
{
struct pim_interface *recv_pim_ifp;
int is_local; /* boolean */
recv_pim_ifp = recv_ifp->info;
assert(recv_pim_ifp);
is_local = !pim_addr_cmp(upstream, recv_pim_ifp->primary_address);
if (is_local)
return 0;
if (PIM_DEBUG_PIM_TRACE_DETAIL)
zlog_warn(
"%s: recv %s (S,G)=%pSG to non-local upstream=%pPAs on %s",
__func__, is_join ? "join" : "prune", sg, &upstream,
recv_ifp->name);
/*
* Since recv upstream addr was not directed to our primary
* address, check if we should react to it in any way.
*/
check_recv_upstream(is_join, recv_ifp, upstream, sg, source_flags,
holdtime);
return 1; /* non-local */
}
static void pim_ifchannel_ifjoin_handler(struct pim_ifchannel *ch,
struct pim_interface *pim_ifp)
{
pim_ifchannel_ifjoin_switch(__func__, ch, PIM_IFJOIN_JOIN);
PIM_IF_FLAG_UNSET_S_G_RPT(ch->flags);
/* check if the interface qualifies as an immediate
* OIF
*/
if (pim_upstream_evaluate_join_desired_interface(
ch->upstream, ch,
NULL /*starch*/)) {
pim_channel_add_oif(ch->upstream->channel_oil,
ch->interface,
PIM_OIF_FLAG_PROTO_PIM,
__func__);
pim_upstream_update_join_desired(pim_ifp->pim,
ch->upstream);
}
}
void pim_ifchannel_join_add(struct interface *ifp, pim_addr neigh_addr,
pim_addr upstream, pim_sgaddr *sg,
uint8_t source_flags, uint16_t holdtime)
{
struct pim_interface *pim_ifp;
struct pim_ifchannel *ch;
if (nonlocal_upstream(1 /* join */, ifp, upstream, sg, source_flags,
holdtime)) {
return;
}
ch = pim_ifchannel_add(ifp, sg, source_flags,
PIM_UPSTREAM_FLAG_MASK_SRC_PIM);
/*
RFC 4601: 4.6.1. (S,G) Assert Message State Machine
Transitions from "I am Assert Loser" State
Receive Join(S,G) on Interface I
We receive a Join(S,G) that has the Upstream Neighbor Address
field set to my primary IP address on interface I. The action is
to transition to NoInfo state, delete this (S,G) assert state
(Actions A5 below), and allow the normal PIM Join/Prune mechanisms
to operate.
Notice: The nonlocal_upstream() test above ensures the upstream
address of the join message is our primary address.
*/
if (ch->ifassert_state == PIM_IFASSERT_I_AM_LOSER) {
zlog_warn("%s: Assert Loser recv Join%s from %pPA on %s",
__func__, ch->sg_str, &neigh_addr, ifp->name);
assert_action_a5(ch);
}
pim_ifp = ifp->info;
assert(pim_ifp);
switch (ch->ifjoin_state) {
case PIM_IFJOIN_NOINFO:
pim_ifchannel_ifjoin_switch(__func__, ch, PIM_IFJOIN_JOIN);
if (pim_macro_chisin_oiflist(ch)) {
pim_upstream_inherited_olist(pim_ifp->pim,
ch->upstream);
pim_forward_start(ch);
}
/*
* If we are going to be a LHR, we need to note it
*/
if (ch->upstream->parent &&
(PIM_UPSTREAM_FLAG_TEST_CAN_BE_LHR(
ch->upstream->parent->flags))
&& !(ch->upstream->flags
& PIM_UPSTREAM_FLAG_MASK_SRC_LHR)) {
pim_upstream_ref(ch->upstream,
PIM_UPSTREAM_FLAG_MASK_SRC_LHR,
__func__);
pim_upstream_keep_alive_timer_start(
ch->upstream, pim_ifp->pim->keep_alive_time);
}
break;
case PIM_IFJOIN_JOIN:
assert(!ch->t_ifjoin_prune_pending_timer);
/*
In the JOIN state ch->t_ifjoin_expiry_timer may be NULL due to
a
previously received join message with holdtime=0xFFFF.
*/
if (ch->t_ifjoin_expiry_timer) {
unsigned long remain = event_timer_remain_second(
ch->t_ifjoin_expiry_timer);
if (remain > holdtime) {
/*
RFC 4601: 4.5.3. Receiving (S,G) Join/Prune
Messages
Transitions from Join State
The (S,G) downstream state machine on
interface I remains in
Join state, and the Expiry Timer (ET) is
restarted, set to
maximum of its current value and the HoldTime
from the
triggering Join/Prune message.
Conclusion: Do not change the ET if the
current value is
higher than the received join holdtime.
*/
return;
}
}
EVENT_OFF(ch->t_ifjoin_expiry_timer);
break;
case PIM_IFJOIN_PRUNE:
if (source_flags & PIM_ENCODE_RPT_BIT) {
pim_ifchannel_ifjoin_switch(__func__, ch,
PIM_IFJOIN_NOINFO);
EVENT_OFF(ch->t_ifjoin_expiry_timer);
delete_on_noinfo(ch);
return;
} else
pim_ifchannel_ifjoin_handler(ch, pim_ifp);
break;
case PIM_IFJOIN_PRUNE_PENDING:
/*
* Transitions from Prune-Pending State (Receive Join)
* RFC 7761 Sec 4.5.2:
* The (S,G) downstream state machine on interface I
* transitions to the Join state. The Prune-Pending Timer is
* canceled (without triggering an expiry event). The
* Expiry Timer (ET) is restarted and is then set to the
* maximum of its current value and the HoldTime from the
* triggering Join/Prune message.
*/
EVENT_OFF(ch->t_ifjoin_prune_pending_timer);
/* Check if SGRpt join Received */
if ((source_flags & PIM_ENCODE_RPT_BIT) &&
!pim_addr_is_any(sg->src)) {
/*
* Transitions from Prune-Pending State (Rcv SGRpt Join)
* RFC 7761 Sec 4.5.3:
* The (S,G,rpt) downstream state machine on interface
* I transitions to the NoInfo state.The ET and PPT are
* cancelled.
*/
EVENT_OFF(ch->t_ifjoin_expiry_timer);
pim_ifchannel_ifjoin_switch(__func__, ch,
PIM_IFJOIN_NOINFO);
return;
}
pim_ifchannel_ifjoin_handler(ch, pim_ifp);
if (ch->t_ifjoin_expiry_timer) {
unsigned long remain = event_timer_remain_second(
ch->t_ifjoin_expiry_timer);
if (remain > holdtime)
return;
}
EVENT_OFF(ch->t_ifjoin_expiry_timer);
break;
case PIM_IFJOIN_PRUNE_TMP:
break;
case PIM_IFJOIN_PRUNE_PENDING_TMP:
break;
}
if (holdtime != 0xFFFF) {
event_add_timer(router->master, on_ifjoin_expiry_timer, ch,
holdtime, &ch->t_ifjoin_expiry_timer);
}
}
void pim_ifchannel_prune(struct interface *ifp, pim_addr upstream,
pim_sgaddr *sg, uint8_t source_flags,
uint16_t holdtime)
{
struct pim_ifchannel *ch;
struct pim_interface *pim_ifp;
int jp_override_interval_msec;