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pim_iface.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 "vty.h"
#include "memory.h"
#include "prefix.h"
#include "vrf.h"
#include "linklist.h"
#include "plist.h"
#include "hash.h"
#include "ferr.h"
#include "pimd.h"
#include "pim_instance.h"
#include "pim_zebra.h"
#include "pim_iface.h"
#include "pim_igmp.h"
#include "pim_mroute.h"
#include "pim_oil.h"
#include "pim_str.h"
#include "pim_pim.h"
#include "pim_neighbor.h"
#include "pim_ifchannel.h"
#include "pim_sock.h"
#include "pim_time.h"
#include "pim_ssmpingd.h"
#include "pim_rp.h"
#include "pim_nht.h"
#include "pim_jp_agg.h"
#include "pim_igmp_join.h"
static void pim_if_igmp_join_del_all(struct interface *ifp);
static int igmp_join_sock(const char *ifname, ifindex_t ifindex,
struct in_addr group_addr,
struct in_addr source_addr);
void pim_if_init(struct pim_instance *pim)
{
int i;
for (i = 0; i < MAXVIFS; i++)
pim->iface_vif_index[i] = 0;
}
void pim_if_terminate(struct pim_instance *pim)
{
struct interface *ifp;
FOR_ALL_INTERFACES (pim->vrf, ifp) {
struct pim_interface *pim_ifp = ifp->info;
if (!pim_ifp)
continue;
pim_if_delete(ifp);
}
return;
}
static void pim_sec_addr_free(struct pim_secondary_addr *sec_addr)
{
XFREE(MTYPE_PIM_SEC_ADDR, sec_addr);
}
static int pim_sec_addr_comp(const void *p1, const void *p2)
{
const struct pim_secondary_addr *sec1 = p1;
const struct pim_secondary_addr *sec2 = p2;
if (sec1->addr.family == AF_INET && sec2->addr.family == AF_INET6)
return -1;
if (sec1->addr.family == AF_INET6 && sec2->addr.family == AF_INET)
return 1;
if (sec1->addr.family == AF_INET) {
if (ntohl(sec1->addr.u.prefix4.s_addr)
< ntohl(sec2->addr.u.prefix4.s_addr))
return -1;
if (ntohl(sec1->addr.u.prefix4.s_addr)
> ntohl(sec2->addr.u.prefix4.s_addr))
return 1;
} else {
return memcmp(&sec1->addr.u.prefix6, &sec2->addr.u.prefix6,
sizeof(struct in6_addr));
}
return 0;
}
struct pim_interface *pim_if_new(struct interface *ifp, bool igmp, bool pim,
bool ispimreg)
{
struct pim_interface *pim_ifp;
zassert(ifp);
zassert(!ifp->info);
pim_ifp = XCALLOC(MTYPE_PIM_INTERFACE, sizeof(*pim_ifp));
pim_ifp->options = 0;
pim_ifp->pim = pim_get_pim_instance(ifp->vrf_id);
pim_ifp->mroute_vif_index = -1;
pim_ifp->igmp_version = IGMP_DEFAULT_VERSION;
pim_ifp->igmp_default_robustness_variable =
IGMP_DEFAULT_ROBUSTNESS_VARIABLE;
pim_ifp->igmp_default_query_interval = IGMP_GENERAL_QUERY_INTERVAL;
pim_ifp->igmp_query_max_response_time_dsec =
IGMP_QUERY_MAX_RESPONSE_TIME_DSEC;
pim_ifp->igmp_specific_query_max_response_time_dsec =
IGMP_SPECIFIC_QUERY_MAX_RESPONSE_TIME_DSEC;
/*
RFC 3376: 8.3. Query Response Interval
The number of seconds represented by the [Query Response Interval]
must be less than the [Query Interval].
*/
zassert(pim_ifp->igmp_query_max_response_time_dsec
< pim_ifp->igmp_default_query_interval);
if (pim)
PIM_IF_DO_PIM(pim_ifp->options);
if (igmp)
PIM_IF_DO_IGMP(pim_ifp->options);
PIM_IF_DO_IGMP_LISTEN_ALLROUTERS(pim_ifp->options);
pim_ifp->igmp_join_list = NULL;
pim_ifp->igmp_socket_list = NULL;
pim_ifp->pim_neighbor_list = NULL;
pim_ifp->upstream_switch_list = NULL;
pim_ifp->pim_generation_id = 0;
/* list of struct igmp_sock */
pim_ifp->igmp_socket_list = list_new();
pim_ifp->igmp_socket_list->del = (void (*)(void *))igmp_sock_free;
/* list of struct pim_neighbor */
pim_ifp->pim_neighbor_list = list_new();
pim_ifp->pim_neighbor_list->del = (void (*)(void *))pim_neighbor_free;
pim_ifp->upstream_switch_list = list_new();
pim_ifp->upstream_switch_list->del =
(void (*)(void *))pim_jp_agg_group_list_free;
pim_ifp->upstream_switch_list->cmp = pim_jp_agg_group_list_cmp;
pim_ifp->sec_addr_list = list_new();
pim_ifp->sec_addr_list->del = (void (*)(void *))pim_sec_addr_free;
pim_ifp->sec_addr_list->cmp =
(int (*)(void *, void *))pim_sec_addr_comp;
pim_ifp->activeactive = false;
RB_INIT(pim_ifchannel_rb, &pim_ifp->ifchannel_rb);
ifp->info = pim_ifp;
pim_sock_reset(ifp);
pim_if_add_vif(ifp, ispimreg);
return pim_ifp;
}
void pim_if_delete(struct interface *ifp)
{
struct pim_interface *pim_ifp;
struct pim_ifchannel *ch;
zassert(ifp);
pim_ifp = ifp->info;
zassert(pim_ifp);
if (pim_ifp->igmp_join_list) {
pim_if_igmp_join_del_all(ifp);
}
pim_ifchannel_delete_all(ifp);
igmp_sock_delete_all(ifp);
pim_neighbor_delete_all(ifp, "Interface removed from configuration");
pim_if_del_vif(ifp);
list_delete(&pim_ifp->igmp_socket_list);
list_delete(&pim_ifp->pim_neighbor_list);
list_delete(&pim_ifp->upstream_switch_list);
list_delete(&pim_ifp->sec_addr_list);
XFREE(MTYPE_PIM_INTERFACE, pim_ifp->boundary_oil_plist);
while (!RB_EMPTY(pim_ifchannel_rb, &pim_ifp->ifchannel_rb)) {
ch = RB_ROOT(pim_ifchannel_rb, &pim_ifp->ifchannel_rb);
pim_ifchannel_delete(ch);
}
XFREE(MTYPE_PIM_INTERFACE, pim_ifp);
ifp->info = NULL;
}
void pim_if_update_could_assert(struct interface *ifp)
{
struct pim_interface *pim_ifp;
struct pim_ifchannel *ch;
pim_ifp = ifp->info;
zassert(pim_ifp);
RB_FOREACH (ch, pim_ifchannel_rb, &pim_ifp->ifchannel_rb) {
pim_ifchannel_update_could_assert(ch);
}
}
static void pim_if_update_my_assert_metric(struct interface *ifp)
{
struct pim_interface *pim_ifp;
struct pim_ifchannel *ch;
pim_ifp = ifp->info;
zassert(pim_ifp);
RB_FOREACH (ch, pim_ifchannel_rb, &pim_ifp->ifchannel_rb) {
pim_ifchannel_update_my_assert_metric(ch);
}
}
static void pim_addr_change(struct interface *ifp)
{
struct pim_interface *pim_ifp;
pim_ifp = ifp->info;
zassert(pim_ifp);
pim_if_dr_election(ifp); /* router's own DR Priority (addr) changes --
Done TODO T30 */
pim_if_update_join_desired(pim_ifp); /* depends on DR */
pim_if_update_could_assert(ifp); /* depends on DR */
pim_if_update_my_assert_metric(ifp); /* depends on could_assert */
pim_if_update_assert_tracking_desired(
ifp); /* depends on DR, join_desired */
/*
RFC 4601: 4.3.1. Sending Hello Messages
1) Before an interface goes down or changes primary IP address, a
Hello message with a zero HoldTime should be sent immediately
(with the old IP address if the IP address changed).
-- FIXME See CAVEAT C13
2) After an interface has changed its IP address, it MUST send a
Hello message with its new IP address.
-- DONE below
3) If an interface changes one of its secondary IP addresses, a
Hello message with an updated Address_List option and a non-zero
HoldTime should be sent immediately.
-- FIXME See TODO T31
*/
pim_ifp->pim_ifstat_hello_sent = 0; /* reset hello counter */
if (pim_ifp->pim_sock_fd < 0)
return;
pim_hello_restart_now(ifp); /* send hello and restart timer */
}
static int detect_primary_address_change(struct interface *ifp,
int force_prim_as_any,
const char *caller)
{
struct pim_interface *pim_ifp = ifp->info;
struct in_addr new_prim_addr;
int changed;
if (force_prim_as_any)
new_prim_addr.s_addr = INADDR_ANY;
else
new_prim_addr = pim_find_primary_addr(ifp);
changed = new_prim_addr.s_addr != pim_ifp->primary_address.s_addr;
if (PIM_DEBUG_ZEBRA) {
char new_prim_str[INET_ADDRSTRLEN];
char old_prim_str[INET_ADDRSTRLEN];
pim_inet4_dump("<new?>", new_prim_addr, new_prim_str,
sizeof(new_prim_str));
pim_inet4_dump("<old?>", pim_ifp->primary_address, old_prim_str,
sizeof(old_prim_str));
zlog_debug("%s: old=%s new=%s on interface %s: %s",
__PRETTY_FUNCTION__, old_prim_str, new_prim_str,
ifp->name, changed ? "changed" : "unchanged");
}
if (changed) {
pim_ifp->primary_address = new_prim_addr;
}
return changed;
}
static struct pim_secondary_addr *
pim_sec_addr_find(struct pim_interface *pim_ifp, struct prefix *addr)
{
struct pim_secondary_addr *sec_addr;
struct listnode *node;
for (ALL_LIST_ELEMENTS_RO(pim_ifp->sec_addr_list, node, sec_addr)) {
if (prefix_cmp(&sec_addr->addr, addr)) {
return sec_addr;
}
}
return NULL;
}
static void pim_sec_addr_del(struct pim_interface *pim_ifp,
struct pim_secondary_addr *sec_addr)
{
listnode_delete(pim_ifp->sec_addr_list, sec_addr);
pim_sec_addr_free(sec_addr);
}
static int pim_sec_addr_add(struct pim_interface *pim_ifp, struct prefix *addr)
{
int changed = 0;
struct pim_secondary_addr *sec_addr;
sec_addr = pim_sec_addr_find(pim_ifp, addr);
if (sec_addr) {
sec_addr->flags &= ~PIM_SEC_ADDRF_STALE;
return changed;
}
sec_addr = XCALLOC(MTYPE_PIM_SEC_ADDR, sizeof(*sec_addr));
changed = 1;
sec_addr->addr = *addr;
listnode_add_sort(pim_ifp->sec_addr_list, sec_addr);
return changed;
}
static int pim_sec_addr_del_all(struct pim_interface *pim_ifp)
{
int changed = 0;
if (!list_isempty(pim_ifp->sec_addr_list)) {
changed = 1;
/* remove all nodes and free up the list itself */
list_delete_all_node(pim_ifp->sec_addr_list);
}
return changed;
}
static int pim_sec_addr_update(struct interface *ifp)
{
struct pim_interface *pim_ifp = ifp->info;
struct connected *ifc;
struct listnode *node;
struct listnode *nextnode;
struct pim_secondary_addr *sec_addr;
int changed = 0;
for (ALL_LIST_ELEMENTS_RO(pim_ifp->sec_addr_list, node, sec_addr)) {
sec_addr->flags |= PIM_SEC_ADDRF_STALE;
}
for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
struct prefix *p = ifc->address;
if (PIM_INADDR_IS_ANY(p->u.prefix4)) {
continue;
}
if (pim_ifp->primary_address.s_addr == p->u.prefix4.s_addr) {
/* don't add the primary address into the secondary
* address list */
continue;
}
if (pim_sec_addr_add(pim_ifp, p)) {
changed = 1;
}
}
/* Drop stale entries */
for (ALL_LIST_ELEMENTS(pim_ifp->sec_addr_list, node, nextnode,
sec_addr)) {
if (sec_addr->flags & PIM_SEC_ADDRF_STALE) {
pim_sec_addr_del(pim_ifp, sec_addr);
changed = 1;
}
}
return changed;
}
static int detect_secondary_address_change(struct interface *ifp,
int force_prim_as_any,
const char *caller)
{
struct pim_interface *pim_ifp = ifp->info;
int changed = 0;
if (force_prim_as_any) {
/* if primary address is being forced to zero just flush the
* secondary address list */
changed = pim_sec_addr_del_all(pim_ifp);
} else {
/* re-evaluate the secondary address list */
changed = pim_sec_addr_update(ifp);
}
return changed;
}
static void detect_address_change(struct interface *ifp, int force_prim_as_any,
const char *caller)
{
int changed = 0;
struct pim_interface *pim_ifp;
pim_ifp = ifp->info;
if (!pim_ifp)
return;
if (detect_primary_address_change(ifp, force_prim_as_any, caller)) {
changed = 1;
}
if (detect_secondary_address_change(ifp, force_prim_as_any, caller)) {
changed = 1;
}
if (changed) {
if (!PIM_IF_TEST_PIM(pim_ifp->options)) {
return;
}
pim_addr_change(ifp);
}
/* XXX: if we have unnumbered interfaces we need to run detect address
* address change on all of them when the lo address changes */
}
int pim_update_source_set(struct interface *ifp, struct in_addr source)
{
struct pim_interface *pim_ifp = ifp->info;
if (!pim_ifp) {
return PIM_IFACE_NOT_FOUND;
}
if (pim_ifp->update_source.s_addr == source.s_addr) {
return PIM_UPDATE_SOURCE_DUP;
}
pim_ifp->update_source = source;
detect_address_change(ifp, 0 /* force_prim_as_any */,
__PRETTY_FUNCTION__);
return PIM_SUCCESS;
}
void pim_if_addr_add(struct connected *ifc)
{
struct pim_interface *pim_ifp;
struct interface *ifp;
struct in_addr ifaddr;
zassert(ifc);
ifp = ifc->ifp;
zassert(ifp);
pim_ifp = ifp->info;
if (!pim_ifp)
return;
if (!if_is_operative(ifp))
return;
if (PIM_DEBUG_ZEBRA) {
char buf[BUFSIZ];
prefix2str(ifc->address, buf, BUFSIZ);
zlog_debug("%s: %s ifindex=%d connected IP address %s %s",
__PRETTY_FUNCTION__, ifp->name, ifp->ifindex, buf,
CHECK_FLAG(ifc->flags, ZEBRA_IFA_SECONDARY)
? "secondary"
: "primary");
}
ifaddr = ifc->address->u.prefix4;
detect_address_change(ifp, 0, __PRETTY_FUNCTION__);
// if (ifc->address->family != AF_INET)
// return;
if (PIM_IF_TEST_IGMP(pim_ifp->options)) {
struct igmp_sock *igmp;
/* lookup IGMP socket */
igmp = pim_igmp_sock_lookup_ifaddr(pim_ifp->igmp_socket_list,
ifaddr);
if (!igmp) {
/* if addr new, add IGMP socket */
if (ifc->address->family == AF_INET)
pim_igmp_sock_add(pim_ifp->igmp_socket_list,
ifaddr, ifp, false);
} else if (igmp->mtrace_only) {
igmp_sock_delete(igmp);
pim_igmp_sock_add(pim_ifp->igmp_socket_list, ifaddr,
ifp, false);
}
/* Replay Static IGMP groups */
if (pim_ifp->igmp_join_list) {
struct listnode *node;
struct listnode *nextnode;
struct igmp_join *ij;
int join_fd;
for (ALL_LIST_ELEMENTS(pim_ifp->igmp_join_list, node,
nextnode, ij)) {
/* Close socket and reopen with Source and Group
*/
close(ij->sock_fd);
join_fd = igmp_join_sock(
ifp->name, ifp->ifindex, ij->group_addr,
ij->source_addr);
if (join_fd < 0) {
char group_str[INET_ADDRSTRLEN];
char source_str[INET_ADDRSTRLEN];
pim_inet4_dump("<grp?>", ij->group_addr,
group_str,
sizeof(group_str));
pim_inet4_dump(
"<src?>", ij->source_addr,
source_str, sizeof(source_str));
zlog_warn(
"%s: igmp_join_sock() failure for IGMP group %s source %s on interface %s",
__PRETTY_FUNCTION__, group_str,
source_str, ifp->name);
/* warning only */
} else
ij->sock_fd = join_fd;
}
}
} /* igmp */
else {
struct igmp_sock *igmp;
/* lookup IGMP socket */
igmp = pim_igmp_sock_lookup_ifaddr(pim_ifp->igmp_socket_list,
ifaddr);
if (ifc->address->family == AF_INET) {
if (igmp)
igmp_sock_delete(igmp);
/* if addr new, add IGMP socket */
pim_igmp_sock_add(pim_ifp->igmp_socket_list, ifaddr,
ifp, true);
}
} /* igmp mtrace only */
if (PIM_IF_TEST_PIM(pim_ifp->options)) {
if (PIM_INADDR_ISNOT_ANY(pim_ifp->primary_address)) {
/* Interface has a valid socket ? */
if (pim_ifp->pim_sock_fd < 0) {
if (pim_sock_add(ifp)) {
zlog_warn(
"Failure creating PIM socket for interface %s",
ifp->name);
}
}
struct pim_nexthop_cache *pnc = NULL;
struct pim_rpf rpf;
struct zclient *zclient = NULL;
zclient = pim_zebra_zclient_get();
/* RP config might come prior to (local RP's interface)
IF UP event.
In this case, pnc would not have pim enabled
nexthops.
Once Interface is UP and pim info is available,
reregister
with RNH address to receive update and add the
interface as nexthop. */
memset(&rpf, 0, sizeof(struct pim_rpf));
rpf.rpf_addr.family = AF_INET;
rpf.rpf_addr.prefixlen = IPV4_MAX_BITLEN;
rpf.rpf_addr.u.prefix4 = ifc->address->u.prefix4;
pnc = pim_nexthop_cache_find(pim_ifp->pim, &rpf);
if (pnc)
pim_sendmsg_zebra_rnh(pim_ifp->pim, zclient,
pnc,
ZEBRA_NEXTHOP_REGISTER);
}
} /* pim */
/*
PIM or IGMP is enabled on interface, and there is at least one
address assigned, then try to create a vif_index.
*/
if (pim_ifp->mroute_vif_index < 0) {
pim_if_add_vif(ifp, false);
}
pim_ifchannel_scan_forward_start(ifp);
}
static void pim_if_addr_del_igmp(struct connected *ifc)
{
struct pim_interface *pim_ifp = ifc->ifp->info;
struct igmp_sock *igmp;
struct in_addr ifaddr;
if (ifc->address->family != AF_INET) {
/* non-IPv4 address */
return;
}
if (!pim_ifp) {
/* IGMP not enabled on interface */
return;
}
ifaddr = ifc->address->u.prefix4;
/* lookup IGMP socket */
igmp = pim_igmp_sock_lookup_ifaddr(pim_ifp->igmp_socket_list, ifaddr);
if (igmp) {
/* if addr found, del IGMP socket */
igmp_sock_delete(igmp);
}
}
static void pim_if_addr_del_pim(struct connected *ifc)
{
struct pim_interface *pim_ifp = ifc->ifp->info;
if (ifc->address->family != AF_INET) {
/* non-IPv4 address */
return;
}
if (!pim_ifp) {
/* PIM not enabled on interface */
return;
}
if (PIM_INADDR_ISNOT_ANY(pim_ifp->primary_address)) {
/* Interface keeps a valid primary address */
return;
}
if (pim_ifp->pim_sock_fd < 0) {
/* Interface does not hold a valid socket any longer */
return;
}
/*
pim_sock_delete() closes the socket, stops read and timer threads,
and kills all neighbors.
*/
pim_sock_delete(ifc->ifp,
"last address has been removed from interface");
}
void pim_if_addr_del(struct connected *ifc, int force_prim_as_any)
{
struct interface *ifp;
zassert(ifc);
ifp = ifc->ifp;
zassert(ifp);
if (PIM_DEBUG_ZEBRA) {
char buf[BUFSIZ];
prefix2str(ifc->address, buf, BUFSIZ);
zlog_debug("%s: %s ifindex=%d disconnected IP address %s %s",
__PRETTY_FUNCTION__, ifp->name, ifp->ifindex, buf,
CHECK_FLAG(ifc->flags, ZEBRA_IFA_SECONDARY)
? "secondary"
: "primary");
}
detect_address_change(ifp, force_prim_as_any, __PRETTY_FUNCTION__);
pim_if_addr_del_igmp(ifc);
pim_if_addr_del_pim(ifc);
}
void pim_if_addr_add_all(struct interface *ifp)
{
struct connected *ifc;
struct listnode *node;
struct listnode *nextnode;
int v4_addrs = 0;
int v6_addrs = 0;
struct pim_interface *pim_ifp = ifp->info;
/* PIM/IGMP enabled ? */
if (!pim_ifp)
return;
for (ALL_LIST_ELEMENTS(ifp->connected, node, nextnode, ifc)) {
struct prefix *p = ifc->address;
if (p->family != AF_INET)
v6_addrs++;
else
v4_addrs++;
pim_if_addr_add(ifc);
}
if (!v4_addrs && v6_addrs && !if_is_loopback(ifp)) {
if (PIM_IF_TEST_PIM(pim_ifp->options)) {
/* Interface has a valid primary address ? */
if (PIM_INADDR_ISNOT_ANY(pim_ifp->primary_address)) {
/* Interface has a valid socket ? */
if (pim_ifp->pim_sock_fd < 0) {
if (pim_sock_add(ifp)) {
zlog_warn(
"Failure creating PIM socket for interface %s",
ifp->name);
}
}
}
} /* pim */
}
/*
* PIM or IGMP is enabled on interface, and there is at least one
* address assigned, then try to create a vif_index.
*/
if (pim_ifp->mroute_vif_index < 0) {
pim_if_add_vif(ifp, false);
}
pim_ifchannel_scan_forward_start(ifp);
pim_rp_setup(pim_ifp->pim);
pim_rp_check_on_if_add(pim_ifp);
}
void pim_if_addr_del_all(struct interface *ifp)
{
struct connected *ifc;
struct listnode *node;
struct listnode *nextnode;
struct vrf *vrf = vrf_lookup_by_id(ifp->vrf_id);
struct pim_instance *pim;
if (!vrf)
return;
pim = vrf->info;
/* PIM/IGMP enabled ? */
if (!ifp->info)
return;
for (ALL_LIST_ELEMENTS(ifp->connected, node, nextnode, ifc)) {
struct prefix *p = ifc->address;
if (p->family != AF_INET)
continue;
pim_if_addr_del(ifc, 1 /* force_prim_as_any=true */);
}
pim_rp_setup(pim);
pim_i_am_rp_re_evaluate(pim);
}
void pim_if_addr_del_all_igmp(struct interface *ifp)
{
struct connected *ifc;
struct listnode *node;
struct listnode *nextnode;
/* PIM/IGMP enabled ? */
if (!ifp->info)
return;
for (ALL_LIST_ELEMENTS(ifp->connected, node, nextnode, ifc)) {
struct prefix *p = ifc->address;
if (p->family != AF_INET)
continue;
pim_if_addr_del_igmp(ifc);
}
}
void pim_if_addr_del_all_pim(struct interface *ifp)
{
struct connected *ifc;
struct listnode *node;
struct listnode *nextnode;
/* PIM/IGMP enabled ? */
if (!ifp->info)
return;
for (ALL_LIST_ELEMENTS(ifp->connected, node, nextnode, ifc)) {
struct prefix *p = ifc->address;
if (p->family != AF_INET)
continue;
pim_if_addr_del_pim(ifc);
}
}
struct in_addr pim_find_primary_addr(struct interface *ifp)
{
struct connected *ifc;
struct listnode *node;
struct in_addr addr = {0};
int v4_addrs = 0;
int v6_addrs = 0;
struct pim_interface *pim_ifp = ifp->info;
struct vrf *vrf = vrf_lookup_by_id(ifp->vrf_id);
if (!vrf)
return addr;
if (pim_ifp && PIM_INADDR_ISNOT_ANY(pim_ifp->update_source)) {
return pim_ifp->update_source;
}
for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
struct prefix *p = ifc->address;
if (p->family != AF_INET) {
v6_addrs++;
continue;
}
if (PIM_INADDR_IS_ANY(p->u.prefix4)) {
zlog_warn(
"%s: null IPv4 address connected to interface %s",
__PRETTY_FUNCTION__, ifp->name);
continue;
}
v4_addrs++;
if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_SECONDARY))
continue;
return p->u.prefix4;
}
/*
* If we have no v4_addrs and v6 is configured
* We probably are using unnumbered
* So let's grab the loopbacks v4 address
* and use that as the primary address
*/
if (!v4_addrs && v6_addrs && !if_is_loopback(ifp)) {
struct interface *lo_ifp;
// DBS - Come back and check here
if (ifp->vrf_id == VRF_DEFAULT)
lo_ifp = if_lookup_by_name("lo", vrf->vrf_id);
else
lo_ifp = if_lookup_by_name(vrf->name, vrf->vrf_id);
if (lo_ifp)
return pim_find_primary_addr(lo_ifp);
}
addr.s_addr = PIM_NET_INADDR_ANY;
return addr;
}
static int pim_iface_next_vif_index(struct interface *ifp)
{
struct pim_interface *pim_ifp = ifp->info;
struct pim_instance *pim = pim_ifp->pim;
int i;
/*
* The pimreg vif is always going to be in index 0
* of the table.
*/
if (ifp->ifindex == PIM_OIF_PIM_REGISTER_VIF)
return 0;
for (i = 1; i < MAXVIFS; i++) {
if (pim->iface_vif_index[i] == 0)
return i;
}
return MAXVIFS;
}
/*
pim_if_add_vif() uses ifindex as vif_index
see also pim_if_find_vifindex_by_ifindex()
*/
int pim_if_add_vif(struct interface *ifp, bool ispimreg)
{
struct pim_interface *pim_ifp = ifp->info;
struct in_addr ifaddr;
unsigned char flags = 0;
zassert(pim_ifp);
if (pim_ifp->mroute_vif_index > 0) {
zlog_warn("%s: vif_index=%d > 0 on interface %s ifindex=%d",
__PRETTY_FUNCTION__, pim_ifp->mroute_vif_index,
ifp->name, ifp->ifindex);
return -1;
}
if (ifp->ifindex < 0) {
zlog_warn("%s: ifindex=%d < 1 on interface %s",
__PRETTY_FUNCTION__, ifp->ifindex, ifp->name);
return -2;
}
ifaddr = pim_ifp->primary_address;
if (!ispimreg && PIM_INADDR_IS_ANY(ifaddr)) {
zlog_warn(
"%s: could not get address for interface %s ifindex=%d",
__PRETTY_FUNCTION__, ifp->name, ifp->ifindex);
return -4;
}
pim_ifp->mroute_vif_index = pim_iface_next_vif_index(ifp);
if (pim_ifp->mroute_vif_index >= MAXVIFS) {
zlog_warn(
"%s: Attempting to configure more than MAXVIFS=%d on pim enabled interface %s",
__PRETTY_FUNCTION__, MAXVIFS, ifp->name);
return -3;
}
if (ifp->ifindex == PIM_OIF_PIM_REGISTER_VIF)
flags = VIFF_REGISTER;
#ifdef VIFF_USE_IFINDEX
else
flags = VIFF_USE_IFINDEX;
#endif
if (pim_mroute_add_vif(ifp, ifaddr, flags)) {
/* pim_mroute_add_vif reported error */
return -5;
}
pim_ifp->pim->iface_vif_index[pim_ifp->mroute_vif_index] = 1;
return 0;
}
int pim_if_del_vif(struct interface *ifp)
{
struct pim_interface *pim_ifp = ifp->info;
if (pim_ifp->mroute_vif_index < 1) {
zlog_warn("%s: vif_index=%d < 1 on interface %s ifindex=%d",
__PRETTY_FUNCTION__, pim_ifp->mroute_vif_index,
ifp->name, ifp->ifindex);
return -1;
}
pim_mroute_del_vif(ifp);
/*
Update vif_index
*/
pim_ifp->pim->iface_vif_index[pim_ifp->mroute_vif_index] = 0;