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pim_zebra.c
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pim_zebra.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 "if.h"
#include "log.h"
#include "prefix.h"
#include "zclient.h"
#include "stream.h"
#include "network.h"
#include "vty.h"
#include "plist.h"
#include "lib/bfd.h"
#include "pimd.h"
#include "pim_pim.h"
#include "pim_zebra.h"
#include "pim_iface.h"
#include "pim_str.h"
#include "pim_oil.h"
#include "pim_rpf.h"
#include "pim_time.h"
#include "pim_join.h"
#include "pim_zlookup.h"
#include "pim_ifchannel.h"
#include "pim_rp.h"
#include "pim_igmpv3.h"
#include "pim_jp_agg.h"
#include "pim_nht.h"
#include "pim_ssm.h"
#undef PIM_DEBUG_IFADDR_DUMP
#define PIM_DEBUG_IFADDR_DUMP
static struct zclient *zclient = NULL;
/* Router-id update message from zebra. */
static int pim_router_id_update_zebra(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct prefix router_id;
zebra_router_id_update_read(zclient->ibuf, &router_id);
return 0;
}
static int pim_zebra_if_add(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct interface *ifp;
struct pim_instance *pim;
/*
zebra api adds/dels interfaces using the same call
interface_add_read below, see comments in lib/zclient.c
*/
ifp = zebra_interface_add_read(zclient->ibuf, vrf_id);
if (!ifp)
return 0;
pim = pim_get_pim_instance(vrf_id);
if (PIM_DEBUG_ZEBRA) {
zlog_debug(
"%s: %s index %d(%u) flags %ld metric %d mtu %d operative %d",
__PRETTY_FUNCTION__, ifp->name, ifp->ifindex, vrf_id,
(long)ifp->flags, ifp->metric, ifp->mtu,
if_is_operative(ifp));
}
if (if_is_operative(ifp)) {
struct pim_interface *pim_ifp;
pim_ifp = ifp->info;
/*
* If we have a pim_ifp already and this is an if_add
* that means that we probably have a vrf move event
* If that is the case, set the proper vrfness.
*/
if (pim_ifp)
pim_ifp->pim = pim;
pim_if_addr_add_all(ifp);
}
/*
* If we are a vrf device that is up, open up the pim_socket for
* listening
* to incoming pim messages irrelevant if the user has configured us
* for pim or not.
*/
if (pim_if_is_vrf_device(ifp)) {
struct pim_interface *pim_ifp;
if (!ifp->info) {
pim_ifp = pim_if_new(ifp, false, false, false);
ifp->info = pim_ifp;
}
pim_sock_add(ifp);
}
return 0;
}
static int pim_zebra_if_del(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct interface *ifp;
/*
zebra api adds/dels interfaces using the same call
interface_add_read below, see comments in lib/zclient.c
comments in lib/zclient.c seem to indicate that calling
zebra_interface_add_read is the correct call, but that
results in an attemted out of bounds read which causes
pimd to assert. Other clients use zebra_interface_state_read
and it appears to work just fine.
*/
ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
if (!ifp)
return 0;
if (PIM_DEBUG_ZEBRA) {
zlog_debug(
"%s: %s index %d(%u) flags %ld metric %d mtu %d operative %d",
__PRETTY_FUNCTION__, ifp->name, ifp->ifindex, vrf_id,
(long)ifp->flags, ifp->metric, ifp->mtu,
if_is_operative(ifp));
}
if (!if_is_operative(ifp))
pim_if_addr_del_all(ifp);
return 0;
}
static int pim_zebra_if_state_up(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct pim_instance *pim;
struct interface *ifp;
uint32_t table_id;
/*
zebra api notifies interface up/down events by using the same call
zebra_interface_state_read below, see comments in lib/zclient.c
*/
ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
if (!ifp)
return 0;
if (PIM_DEBUG_ZEBRA) {
zlog_debug(
"%s: %s index %d(%u) flags %ld metric %d mtu %d operative %d",
__PRETTY_FUNCTION__, ifp->name, ifp->ifindex, vrf_id,
(long)ifp->flags, ifp->metric, ifp->mtu,
if_is_operative(ifp));
}
pim = pim_get_pim_instance(vrf_id);
if (if_is_operative(ifp)) {
struct pim_interface *pim_ifp;
pim_ifp = ifp->info;
/*
* If we have a pim_ifp already and this is an if_add
* that means that we probably have a vrf move event
* If that is the case, set the proper vrfness.
*/
if (pim_ifp)
pim_ifp->pim = pim;
/*
pim_if_addr_add_all() suffices for bringing up both IGMP and
PIM
*/
pim_if_addr_add_all(ifp);
}
/*
* If we have a pimreg device callback and it's for a specific
* table set the master appropriately
*/
if (sscanf(ifp->name, "pimreg%" SCNu32, &table_id) == 1) {
struct vrf *vrf;
RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) {
if ((table_id == vrf->data.l.table_id)
&& (ifp->vrf_id != vrf->vrf_id)) {
struct interface *master = if_lookup_by_name(
vrf->name, vrf->vrf_id);
if (!master) {
zlog_debug(
"%s: Unable to find Master interface for %s",
__PRETTY_FUNCTION__, vrf->name);
return 0;
}
zclient_interface_set_master(zclient, master,
ifp);
}
}
}
return 0;
}
static int pim_zebra_if_state_down(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct interface *ifp;
/*
zebra api notifies interface up/down events by using the same call
zebra_interface_state_read below, see comments in lib/zclient.c
*/
ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
if (!ifp)
return 0;
if (PIM_DEBUG_ZEBRA) {
zlog_debug(
"%s: %s index %d(%u) flags %ld metric %d mtu %d operative %d",
__PRETTY_FUNCTION__, ifp->name, ifp->ifindex, vrf_id,
(long)ifp->flags, ifp->metric, ifp->mtu,
if_is_operative(ifp));
}
if (!if_is_operative(ifp)) {
pim_ifchannel_delete_all(ifp);
/*
pim_if_addr_del_all() suffices for shutting down IGMP,
but not for shutting down PIM
*/
pim_if_addr_del_all(ifp);
/*
pim_sock_delete() closes the socket, stops read and timer
threads,
and kills all neighbors.
*/
if (ifp->info) {
pim_sock_delete(ifp, "link down");
}
}
if (ifp->info)
pim_if_del_vif(ifp);
return 0;
}
#ifdef PIM_DEBUG_IFADDR_DUMP
static void dump_if_address(struct interface *ifp)
{
struct connected *ifc;
struct listnode *node;
zlog_debug("%s %s: interface %s addresses:", __FILE__,
__PRETTY_FUNCTION__, ifp->name);
for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
struct prefix *p = ifc->address;
if (p->family != AF_INET)
continue;
zlog_debug("%s %s: interface %s address %s %s", __FILE__,
__PRETTY_FUNCTION__, ifp->name,
inet_ntoa(p->u.prefix4),
CHECK_FLAG(ifc->flags, ZEBRA_IFA_SECONDARY)
? "secondary"
: "primary");
}
}
#endif
static int pim_zebra_if_address_add(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct connected *c;
struct prefix *p;
struct pim_interface *pim_ifp;
struct pim_instance *pim;
/*
zebra api notifies address adds/dels events by using the same call
interface_add_read below, see comments in lib/zclient.c
zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_ADD, ...)
will add address to interface list by calling
connected_add_by_prefix()
*/
c = zebra_interface_address_read(command, zclient->ibuf, vrf_id);
if (!c)
return 0;
pim_ifp = c->ifp->info;
p = c->address;
if (PIM_DEBUG_ZEBRA) {
char buf[BUFSIZ];
prefix2str(p, buf, BUFSIZ);
zlog_debug("%s: %s(%u) connected IP address %s flags %u %s",
__PRETTY_FUNCTION__, c->ifp->name, vrf_id, buf,
c->flags,
CHECK_FLAG(c->flags, ZEBRA_IFA_SECONDARY)
? "secondary"
: "primary");
#ifdef PIM_DEBUG_IFADDR_DUMP
dump_if_address(c->ifp);
#endif
}
if (!CHECK_FLAG(c->flags, ZEBRA_IFA_SECONDARY)) {
/* trying to add primary address */
struct in_addr primary_addr = pim_find_primary_addr(c->ifp);
if (p->family != AF_INET
|| primary_addr.s_addr != p->u.prefix4.s_addr) {
if (PIM_DEBUG_ZEBRA) {
/* but we had a primary address already */
char buf[BUFSIZ];
prefix2str(p, buf, BUFSIZ);
zlog_warn(
"%s: %s : forcing secondary flag on %s",
__PRETTY_FUNCTION__, c->ifp->name, buf);
}
SET_FLAG(c->flags, ZEBRA_IFA_SECONDARY);
}
}
pim_if_addr_add(c);
if (pim_ifp) {
pim = pim_get_pim_instance(vrf_id);
pim_ifp->pim = pim;
pim_rp_check_on_if_add(pim_ifp);
}
if (if_is_loopback(c->ifp)) {
struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
struct interface *ifp;
FOR_ALL_INTERFACES (vrf, ifp) {
if (!if_is_loopback(ifp) && if_is_operative(ifp))
pim_if_addr_add_all(ifp);
}
}
return 0;
}
static int pim_zebra_if_address_del(int command, struct zclient *client,
zebra_size_t length, vrf_id_t vrf_id)
{
struct connected *c;
struct prefix *p;
struct vrf *vrf = vrf_lookup_by_id(vrf_id);
struct pim_instance *pim;
if (!vrf)
return 0;
pim = vrf->info;
/*
zebra api notifies address adds/dels events by using the same call
interface_add_read below, see comments in lib/zclient.c
zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_DELETE, ...)
will remove address from interface list by calling
connected_delete_by_prefix()
*/
c = zebra_interface_address_read(command, client->ibuf, vrf_id);
if (!c)
return 0;
p = c->address;
if (p->family == AF_INET) {
if (PIM_DEBUG_ZEBRA) {
char buf[BUFSIZ];
prefix2str(p, buf, BUFSIZ);
zlog_debug(
"%s: %s(%u) disconnected IP address %s flags %u %s",
__PRETTY_FUNCTION__, c->ifp->name, vrf_id, buf,
c->flags,
CHECK_FLAG(c->flags, ZEBRA_IFA_SECONDARY)
? "secondary"
: "primary");
#ifdef PIM_DEBUG_IFADDR_DUMP
dump_if_address(c->ifp);
#endif
}
pim_if_addr_del(c, 0);
pim_rp_setup(pim);
pim_i_am_rp_re_evaluate(pim);
}
connected_free(c);
return 0;
}
void pim_zebra_update_all_interfaces(struct pim_instance *pim)
{
struct interface *ifp;
FOR_ALL_INTERFACES (pim->vrf, ifp) {
struct pim_interface *pim_ifp = ifp->info;
struct pim_iface_upstream_switch *us;
struct listnode *node;
if (!pim_ifp)
continue;
for (ALL_LIST_ELEMENTS_RO(pim_ifp->upstream_switch_list, node,
us)) {
struct pim_rpf rpf;
rpf.source_nexthop.interface = ifp;
rpf.rpf_addr.u.prefix4 = us->address;
pim_joinprune_send(&rpf, us->us);
pim_jp_agg_clear_group(us->us);
}
}
}
void pim_zebra_upstream_rpf_changed(struct pim_instance *pim,
struct pim_upstream *up,
struct pim_rpf *old)
{
struct pim_neighbor *nbr;
nbr = pim_neighbor_find(old->source_nexthop.interface,
old->rpf_addr.u.prefix4);
if (nbr)
pim_jp_agg_remove_group(nbr->upstream_jp_agg, up);
/*
* We have detected a case where we might need
* to rescan the inherited o_list so do it.
*/
if (up->channel_oil->oil_inherited_rescan) {
pim_upstream_inherited_olist_decide(pim, up);
up->channel_oil->oil_inherited_rescan = 0;
}
if (up->join_state == PIM_UPSTREAM_JOINED) {
/*
* If we come up real fast we can be here
* where the mroute has not been installed
* so install it.
*/
if (!up->channel_oil->installed)
pim_mroute_add(up->channel_oil, __PRETTY_FUNCTION__);
/*
* RFC 4601: 4.5.7. Sending (S,G)
* Join/Prune Messages
*
* Transitions from Joined State
*
* RPF'(S,G) changes not due to an Assert
*
* The upstream (S,G) state machine remains
* in Joined state. Send Join(S,G) to the new
* upstream neighbor, which is the new value
* of RPF'(S,G). Send Prune(S,G) to the old
* upstream neighbor, which is the old value
* of RPF'(S,G). Set the Join Timer (JT) to
* expire after t_periodic seconds.
*/
pim_jp_agg_switch_interface(old, &up->rpf, up);
pim_upstream_join_timer_restart(up, old);
} /* up->join_state == PIM_UPSTREAM_JOINED */
/* FIXME can join_desired actually be changed by
pim_rpf_update()
returning PIM_RPF_CHANGED ? */
pim_upstream_update_join_desired(pim, up);
}
static void scan_upstream_rpf_cache(struct pim_instance *pim)
{
struct listnode *up_node;
struct listnode *up_nextnode;
struct pim_upstream *up;
for (ALL_LIST_ELEMENTS(pim->upstream_list, up_node, up_nextnode, up)) {
enum pim_rpf_result rpf_result;
struct pim_rpf old;
struct prefix nht_p;
nht_p.family = AF_INET;
nht_p.prefixlen = IPV4_MAX_BITLEN;
nht_p.u.prefix4.s_addr = up->upstream_addr.s_addr;
pim_resolve_upstream_nh(pim, &nht_p);
old.source_nexthop.interface = up->rpf.source_nexthop.interface;
old.source_nexthop.nbr = up->rpf.source_nexthop.nbr;
rpf_result = pim_rpf_update(pim, up, &old, 0);
if (rpf_result == PIM_RPF_FAILURE)
continue;
if (rpf_result == PIM_RPF_CHANGED)
pim_zebra_upstream_rpf_changed(pim, up, &old);
} /* for (qpim_upstream_list) */
pim_zebra_update_all_interfaces(pim);
}
void pim_scan_individual_oil(struct channel_oil *c_oil, int in_vif_index)
{
struct in_addr vif_source;
int input_iface_vif_index;
int old_vif_index;
if (!pim_rp_set_upstream_addr(c_oil->pim, &vif_source,
c_oil->oil.mfcc_origin,
c_oil->oil.mfcc_mcastgrp))
return;
if (in_vif_index)
input_iface_vif_index = in_vif_index;
else {
struct prefix src, grp;
src.family = AF_INET;
src.prefixlen = IPV4_MAX_BITLEN;
src.u.prefix4 = vif_source;
grp.family = AF_INET;
grp.prefixlen = IPV4_MAX_BITLEN;
grp.u.prefix4 = c_oil->oil.mfcc_mcastgrp;
if (PIM_DEBUG_ZEBRA) {
char source_str[INET_ADDRSTRLEN];
char group_str[INET_ADDRSTRLEN];
pim_inet4_dump("<source?>", c_oil->oil.mfcc_origin,
source_str, sizeof(source_str));
pim_inet4_dump("<group?>", c_oil->oil.mfcc_mcastgrp,
group_str, sizeof(group_str));
zlog_debug(
"%s: channel_oil (%s,%s) upstream info is not present.",
__PRETTY_FUNCTION__, source_str, group_str);
}
input_iface_vif_index = pim_ecmp_fib_lookup_if_vif_index(
c_oil->pim, &src, &grp);
}
if (input_iface_vif_index < 1) {
if (PIM_DEBUG_ZEBRA) {
char source_str[INET_ADDRSTRLEN];
char group_str[INET_ADDRSTRLEN];
pim_inet4_dump("<source?>", c_oil->oil.mfcc_origin,
source_str, sizeof(source_str));
pim_inet4_dump("<group?>", c_oil->oil.mfcc_mcastgrp,
group_str, sizeof(group_str));
zlog_debug(
"%s %s: could not find input interface(%d) for (S,G)=(%s,%s)",
__FILE__, __PRETTY_FUNCTION__,
c_oil->oil.mfcc_parent, source_str, group_str);
}
pim_mroute_del(c_oil, __PRETTY_FUNCTION__);
return;
}
if (input_iface_vif_index == c_oil->oil.mfcc_parent) {
if (!c_oil->installed)
pim_mroute_add(c_oil, __PRETTY_FUNCTION__);
/* RPF unchanged */
return;
}
if (PIM_DEBUG_ZEBRA) {
struct interface *old_iif = pim_if_find_by_vif_index(
c_oil->pim, c_oil->oil.mfcc_parent);
struct interface *new_iif = pim_if_find_by_vif_index(
c_oil->pim, input_iface_vif_index);
char source_str[INET_ADDRSTRLEN];
char group_str[INET_ADDRSTRLEN];
pim_inet4_dump("<source?>", c_oil->oil.mfcc_origin, source_str,
sizeof(source_str));
pim_inet4_dump("<group?>", c_oil->oil.mfcc_mcastgrp, group_str,
sizeof(group_str));
zlog_debug(
"%s %s: (S,G)=(%s,%s) input interface changed from %s vif_index=%d to %s vif_index=%d",
__FILE__, __PRETTY_FUNCTION__, source_str, group_str,
(old_iif) ? old_iif->name : "<old_iif?>",
c_oil->oil.mfcc_parent,
(new_iif) ? new_iif->name : "<new_iif?>",
input_iface_vif_index);
}
/* new iif loops to existing oif ? */
if (c_oil->oil.mfcc_ttls[input_iface_vif_index]) {
struct interface *new_iif = pim_if_find_by_vif_index(
c_oil->pim, input_iface_vif_index);
if (PIM_DEBUG_ZEBRA) {
char source_str[INET_ADDRSTRLEN];
char group_str[INET_ADDRSTRLEN];
pim_inet4_dump("<source?>", c_oil->oil.mfcc_origin,
source_str, sizeof(source_str));
pim_inet4_dump("<group?>", c_oil->oil.mfcc_mcastgrp,
group_str, sizeof(group_str));
zlog_debug(
"%s %s: (S,G)=(%s,%s) new iif loops to existing oif: %s vif_index=%d",
__FILE__, __PRETTY_FUNCTION__, source_str,
group_str,
(new_iif) ? new_iif->name : "<new_iif?>",
input_iface_vif_index);
}
}
/* update iif vif_index */
old_vif_index = c_oil->oil.mfcc_parent;
c_oil->oil.mfcc_parent = input_iface_vif_index;
/* update kernel multicast forwarding cache (MFC) */
if (pim_mroute_add(c_oil, __PRETTY_FUNCTION__)) {
if (PIM_DEBUG_MROUTE) {
/* just log warning */
struct interface *old_iif = pim_if_find_by_vif_index(
c_oil->pim, old_vif_index);
struct interface *new_iif = pim_if_find_by_vif_index(
c_oil->pim, input_iface_vif_index);
char source_str[INET_ADDRSTRLEN];
char group_str[INET_ADDRSTRLEN];
pim_inet4_dump("<source?>", c_oil->oil.mfcc_origin,
source_str, sizeof(source_str));
pim_inet4_dump("<group?>", c_oil->oil.mfcc_mcastgrp,
group_str, sizeof(group_str));
zlog_debug(
"%s %s: (S,G)=(%s,%s) failure updating input interface from %s vif_index=%d to %s vif_index=%d",
__FILE__, __PRETTY_FUNCTION__, source_str,
group_str,
old_iif ? old_iif->name : "<old_iif?>",
c_oil->oil.mfcc_parent,
new_iif ? new_iif->name : "<new_iif?>",
input_iface_vif_index);
}
}
}
void pim_scan_oil(struct pim_instance *pim)
{
struct listnode *node;
struct listnode *nextnode;
struct channel_oil *c_oil;
ifindex_t ifindex;
int vif_index = 0;
pim->scan_oil_last = pim_time_monotonic_sec();
++pim->scan_oil_events;
for (ALL_LIST_ELEMENTS(pim->channel_oil_list, node, nextnode, c_oil)) {
if (c_oil->up && c_oil->up->rpf.source_nexthop.interface) {
ifindex = c_oil->up->rpf.source_nexthop
.interface->ifindex;
vif_index =
pim_if_find_vifindex_by_ifindex(pim, ifindex);
/* Pass Current selected NH vif index to mroute
* download */
if (vif_index)
pim_scan_individual_oil(c_oil, vif_index);
} else
pim_scan_individual_oil(c_oil, 0);
}
}
static int on_rpf_cache_refresh(struct thread *t)
{
struct pim_instance *pim = THREAD_ARG(t);
/* update PIM protocol state */
scan_upstream_rpf_cache(pim);
/* update kernel multicast forwarding cache (MFC) */
pim_scan_oil(pim);
pim->rpf_cache_refresh_last = pim_time_monotonic_sec();
++pim->rpf_cache_refresh_events;
// It is called as part of pim_neighbor_add
// pim_rp_setup ();
return 0;
}
void sched_rpf_cache_refresh(struct pim_instance *pim)
{
++pim->rpf_cache_refresh_requests;
pim_rpf_set_refresh_time(pim);
if (pim->rpf_cache_refresher) {
/* Refresh timer is already running */
return;
}
/* Start refresh timer */
if (PIM_DEBUG_ZEBRA) {
zlog_debug("%s: triggering %ld msec timer", __PRETTY_FUNCTION__,
qpim_rpf_cache_refresh_delay_msec);
}
thread_add_timer_msec(master, on_rpf_cache_refresh, pim,
qpim_rpf_cache_refresh_delay_msec,
&pim->rpf_cache_refresher);
}
static void pim_zebra_connected(struct zclient *zclient)
{
/* Send the client registration */
bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER);
zclient_send_reg_requests(zclient, pimg->vrf_id);
}
void pim_zebra_init(void)
{
/* Socket for receiving updates from Zebra daemon */
zclient = zclient_new(master, &zclient_options_default);
zclient->zebra_connected = pim_zebra_connected;
zclient->router_id_update = pim_router_id_update_zebra;
zclient->interface_add = pim_zebra_if_add;
zclient->interface_delete = pim_zebra_if_del;
zclient->interface_up = pim_zebra_if_state_up;
zclient->interface_down = pim_zebra_if_state_down;
zclient->interface_address_add = pim_zebra_if_address_add;
zclient->interface_address_delete = pim_zebra_if_address_del;
zclient->nexthop_update = pim_parse_nexthop_update;
zclient_init(zclient, ZEBRA_ROUTE_PIM, 0, &pimd_privs);
if (PIM_DEBUG_PIM_TRACE) {
zlog_notice("%s: zclient socket initialized",
__PRETTY_FUNCTION__);
}
zclient_lookup_new();
}
void igmp_anysource_forward_start(struct pim_instance *pim,
struct igmp_group *group)
{
struct igmp_source *source;
struct in_addr src_addr = {.s_addr = 0};
/* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */
zassert(group->group_filtermode_isexcl);
zassert(listcount(group->group_source_list) < 1);
source = source_new(group, src_addr);
if (!source) {
zlog_warn("%s: Failure to create * source",
__PRETTY_FUNCTION__);
return;
}
igmp_source_forward_start(pim, source);
}
void igmp_anysource_forward_stop(struct igmp_group *group)
{
struct igmp_source *source;
struct in_addr star = {.s_addr = 0};
source = igmp_find_source_by_addr(group, star);
if (source)
igmp_source_forward_stop(source);
}
static void igmp_source_forward_reevaluate_one(struct pim_instance *pim,
struct igmp_source *source)
{
struct prefix_sg sg;
struct igmp_group *group = source->source_group;
struct pim_ifchannel *ch;
if ((source->source_addr.s_addr != INADDR_ANY)
|| !IGMP_SOURCE_TEST_FORWARDING(source->source_flags))
return;
memset(&sg, 0, sizeof(struct prefix_sg));
sg.src = source->source_addr;
sg.grp = group->group_addr;
ch = pim_ifchannel_find(group->group_igmp_sock->interface, &sg);
if (pim_is_grp_ssm(pim, group->group_addr)) {
/* If SSM group withdraw local membership */
if (ch
&& (ch->local_ifmembership == PIM_IFMEMBERSHIP_INCLUDE)) {
if (PIM_DEBUG_PIM_EVENTS)
zlog_debug(
"local membership del for %s as G is now SSM",
pim_str_sg_dump(&sg));
pim_ifchannel_local_membership_del(
group->group_igmp_sock->interface, &sg);
}
} else {
/* If ASM group add local membership */
if (!ch
|| (ch->local_ifmembership == PIM_IFMEMBERSHIP_NOINFO)) {
if (PIM_DEBUG_PIM_EVENTS)
zlog_debug(
"local membership add for %s as G is now ASM",
pim_str_sg_dump(&sg));
pim_ifchannel_local_membership_add(
group->group_igmp_sock->interface, &sg);
}
}
}
void igmp_source_forward_reevaluate_all(struct pim_instance *pim)
{
struct interface *ifp;
FOR_ALL_INTERFACES (pim->vrf, ifp) {
struct pim_interface *pim_ifp = ifp->info;
struct listnode *sock_node;
struct igmp_sock *igmp;
if (!pim_ifp)
continue;
/* scan igmp sockets */
for (ALL_LIST_ELEMENTS_RO(pim_ifp->igmp_socket_list, sock_node,
igmp)) {
struct listnode *grpnode;
struct igmp_group *grp;
/* scan igmp groups */
for (ALL_LIST_ELEMENTS_RO(igmp->igmp_group_list,
grpnode, grp)) {
struct listnode *srcnode;
struct igmp_source *src;
/* scan group sources */
for (ALL_LIST_ELEMENTS_RO(
grp->group_source_list, srcnode,
src)) {
igmp_source_forward_reevaluate_one(pim,
src);
} /* scan group sources */
} /* scan igmp groups */
} /* scan igmp sockets */
} /* scan interfaces */
}
void igmp_source_forward_start(struct pim_instance *pim,
struct igmp_source *source)
{
struct pim_interface *pim_oif;
struct igmp_group *group;
struct prefix_sg sg;
int result;
int input_iface_vif_index = 0;
memset(&sg, 0, sizeof(struct prefix_sg));
sg.src = source->source_addr;
sg.grp = source->source_group->group_addr;
if (PIM_DEBUG_IGMP_TRACE) {
zlog_debug(
"%s: (S,G)=%s igmp_sock=%d oif=%s fwd=%d",
__PRETTY_FUNCTION__, pim_str_sg_dump(&sg),
source->source_group->group_igmp_sock->fd,
source->source_group->group_igmp_sock->interface->name,
IGMP_SOURCE_TEST_FORWARDING(source->source_flags));
}
/* Prevent IGMP interface from installing multicast route multiple
times */
if (IGMP_SOURCE_TEST_FORWARDING(source->source_flags)) {
return;
}
group = source->source_group;
pim_oif = group->group_igmp_sock->interface->info;
if (!pim_oif) {
if (PIM_DEBUG_IGMP_TRACE) {
zlog_debug(
"%s: multicast not enabled on oif=%s ?",
__PRETTY_FUNCTION__,
source->source_group->group_igmp_sock
->interface->name);
}
return;
}
if (!source->source_channel_oil) {
struct in_addr vif_source;
struct prefix nht_p, src, grp;
struct pim_nexthop_cache out_pnc;
struct pim_nexthop nexthop;
struct pim_upstream *up = NULL;
if (!pim_rp_set_upstream_addr(pim, &vif_source,
source->source_addr, sg.grp))
return;
/* Register addr with Zebra NHT */
nht_p.family = AF_INET;
nht_p.prefixlen = IPV4_MAX_BITLEN;
nht_p.u.prefix4 = vif_source;
memset(&out_pnc, 0, sizeof(struct pim_nexthop_cache));
src.family = AF_INET;
src.prefixlen = IPV4_MAX_BITLEN;
src.u.prefix4 = vif_source; // RP or Src address
grp.family = AF_INET;
grp.prefixlen = IPV4_MAX_BITLEN;
grp.u.prefix4 = sg.grp;
if (pim_find_or_track_nexthop(pim, &nht_p, NULL, NULL,
&out_pnc)) {
if (out_pnc.nexthop_num) {
up = pim_upstream_find(pim, &sg);
memset(&nexthop, 0, sizeof(nexthop));
if (up)
memcpy(&nexthop,
&up->rpf.source_nexthop,
sizeof(struct pim_nexthop));
pim_ecmp_nexthop_search(pim, &out_pnc, &nexthop,
&src, &grp, 0);
if (nexthop.interface)
input_iface_vif_index =
pim_if_find_vifindex_by_ifindex(
pim,
nexthop.interface->ifindex);
} else {
if (PIM_DEBUG_ZEBRA) {
char buf1[INET_ADDRSTRLEN];
char buf2[INET_ADDRSTRLEN];
pim_inet4_dump("<source?>",
nht_p.u.prefix4, buf1,
sizeof(buf1));
pim_inet4_dump("<source?>",
grp.u.prefix4, buf2,
sizeof(buf2));
zlog_debug(
"%s: NHT Nexthop not found for addr %s grp %s",
__PRETTY_FUNCTION__, buf1,
buf2);
}
}
} else
input_iface_vif_index =
pim_ecmp_fib_lookup_if_vif_index(pim, &src,
&grp);
if (PIM_DEBUG_ZEBRA) {
char buf2[INET_ADDRSTRLEN];
pim_inet4_dump("<source?>", vif_source, buf2,
sizeof(buf2));
zlog_debug("%s: NHT %s vif_source %s vif_index:%d ",
__PRETTY_FUNCTION__, pim_str_sg_dump(&sg),
buf2, input_iface_vif_index);
}
if (input_iface_vif_index < 1) {
if (PIM_DEBUG_IGMP_TRACE) {
char source_str[INET_ADDRSTRLEN];
pim_inet4_dump("<source?>", source->source_addr,
source_str, sizeof(source_str));
zlog_debug(
"%s %s: could not find input interface for source %s",
__FILE__, __PRETTY_FUNCTION__,
source_str);
}
return;
}
/*