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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
-
- $QuaggaId: $Format:%an, %ai, %h$ $
- */
- #include <zebra.h>
- #include "log.h"
- #include "prefix.h"
- #include "memory.h"
- #include "pimd.h"
- #include "pim_rpf.h"
- #include "pim_pim.h"
- #include "pim_str.h"
- #include "pim_iface.h"
- #include "pim_zlookup.h"
- #include "pim_ifchannel.h"
- static struct in_addr pim_rpf_find_rpf_addr(struct pim_upstream *up);
- int pim_nexthop_lookup(struct pim_nexthop *nexthop,
- struct in_addr addr)
- {
- struct pim_zlookup_nexthop nexthop_tab[PIM_NEXTHOP_IFINDEX_TAB_SIZE];
- int num_ifindex;
- struct interface *ifp;
- int first_ifindex;
- num_ifindex = zclient_lookup_nexthop(qpim_zclient_lookup, nexthop_tab,
- PIM_NEXTHOP_IFINDEX_TAB_SIZE,
- addr, PIM_NEXTHOP_LOOKUP_MAX);
- if (num_ifindex < 1) {
- char addr_str[100];
- pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
- zlog_warn("%s %s: could not find nexthop ifindex for address %s",
- __FILE__, __PRETTY_FUNCTION__,
- addr_str);
- return -1;
- }
- first_ifindex = nexthop_tab[0].ifindex;
- if (num_ifindex > 1) {
- char addr_str[100];
- pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
- zlog_info("%s %s: FIXME ignoring multiple nexthop ifindex'es num_ifindex=%d for address %s (using only ifindex=%d)",
- __FILE__, __PRETTY_FUNCTION__,
- num_ifindex, addr_str, first_ifindex);
- /* debug warning only, do not return */
- }
- ifp = if_lookup_by_index(first_ifindex);
- if (!ifp) {
- char addr_str[100];
- pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
- zlog_warn("%s %s: could not find interface for ifindex %d (address %s)",
- __FILE__, __PRETTY_FUNCTION__,
- first_ifindex, addr_str);
- return -2;
- }
- if (!ifp->info) {
- char addr_str[100];
- pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
- zlog_warn("%s: multicast not enabled on input interface %s (ifindex=%d, RPF for source %s)",
- __PRETTY_FUNCTION__,
- ifp->name, first_ifindex, addr_str);
- /* debug warning only, do not return */
- }
- if (PIM_DEBUG_PIM_TRACE) {
- char nexthop_str[100];
- char addr_str[100];
- pim_inet4_dump("<nexthop?>", nexthop_tab[0].nexthop_addr, nexthop_str, sizeof(nexthop_str));
- pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
- zlog_debug("%s %s: found nexthop %s for address %s: interface %s ifindex=%d metric=%d pref=%d",
- __FILE__, __PRETTY_FUNCTION__,
- nexthop_str, addr_str,
- ifp->name, first_ifindex,
- nexthop_tab[0].route_metric,
- nexthop_tab[0].protocol_distance);
- }
- /* update nextop data */
- nexthop->interface = ifp;
- nexthop->mrib_nexthop_addr = nexthop_tab[0].nexthop_addr;
- nexthop->mrib_metric_preference = nexthop_tab[0].protocol_distance;
- nexthop->mrib_route_metric = nexthop_tab[0].route_metric;
- return 0;
- }
- static int nexthop_mismatch(const struct pim_nexthop *nh1,
- const struct pim_nexthop *nh2)
- {
- return (nh1->interface != nh2->interface)
- ||
- (nh1->mrib_nexthop_addr.s_addr != nh2->mrib_nexthop_addr.s_addr)
- ||
- (nh1->mrib_metric_preference != nh2->mrib_metric_preference)
- ||
- (nh1->mrib_route_metric != nh2->mrib_route_metric);
- }
- enum pim_rpf_result pim_rpf_update(struct pim_upstream *up,
- struct pim_rpf *old_rpf)
- {
- struct pim_nexthop save_nexthop;
- struct pim_rpf save_rpf;
- struct pim_rpf *rpf = &up->rpf;
- save_nexthop = rpf->source_nexthop; /* detect change in pim_nexthop */
- save_rpf = up->rpf;
- if (pim_nexthop_lookup(&rpf->source_nexthop,
- up->source_addr)) {
- return PIM_RPF_FAILURE;
- }
- rpf->rpf_addr = pim_rpf_find_rpf_addr(up);
- if (PIM_INADDR_IS_ANY(rpf->rpf_addr) && PIM_DEBUG_PIM_EVENTS) {
- /* RPF'(S,G) not found */
- char src_str[100];
- char grp_str[100];
- pim_inet4_dump("<src?>", up->source_addr, src_str, sizeof(src_str));
- pim_inet4_dump("<grp?>", up->group_addr, grp_str, sizeof(grp_str));
- zlog_debug("%s %s: RPF'(%s,%s) not found: won't send join upstream",
- __FILE__, __PRETTY_FUNCTION__,
- src_str, grp_str);
- /* warning only */
- }
- /* detect change in pim_nexthop */
- if (nexthop_mismatch(&rpf->source_nexthop, &save_nexthop)) {
- if (PIM_DEBUG_PIM_EVENTS) {
- char src_str[100];
- char grp_str[100];
- char nhaddr_str[100];
- pim_inet4_dump("<src?>", up->source_addr, src_str, sizeof(src_str));
- pim_inet4_dump("<grp?>", up->group_addr, grp_str, sizeof(grp_str));
- pim_inet4_dump("<addr?>", rpf->source_nexthop.mrib_nexthop_addr, nhaddr_str, sizeof(nhaddr_str));
- zlog_debug("%s %s: (S,G)=(%s,%s) source nexthop now is: interface=%s address=%s pref=%d metric=%d",
- __FILE__, __PRETTY_FUNCTION__,
- src_str, grp_str,
- rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<ifname?>",
- nhaddr_str,
- rpf->source_nexthop.mrib_metric_preference,
- rpf->source_nexthop.mrib_route_metric);
- /* warning only */
- }
- pim_upstream_update_join_desired(up);
- pim_upstream_update_could_assert(up);
- pim_upstream_update_my_assert_metric(up);
- }
- /* detect change in RPF_interface(S) */
- if (save_nexthop.interface != rpf->source_nexthop.interface) {
- if (PIM_DEBUG_PIM_EVENTS) {
- char src_str[100];
- char grp_str[100];
- pim_inet4_dump("<src?>", up->source_addr, src_str, sizeof(src_str));
- pim_inet4_dump("<grp?>", up->group_addr, grp_str, sizeof(grp_str));
- zlog_debug("%s %s: (S,G)=(%s,%s) RPF_interface(S) changed from %s to %s",
- __FILE__, __PRETTY_FUNCTION__,
- src_str, grp_str,
- save_nexthop.interface ? save_nexthop.interface->name : "<oldif?>",
- rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<newif?>");
- /* warning only */
- }
- pim_upstream_rpf_interface_changed(up, save_nexthop.interface);
- }
- /* detect change in RPF'(S,G) */
- if (save_rpf.rpf_addr.s_addr != rpf->rpf_addr.s_addr) {
- /* return old rpf to caller ? */
- if (old_rpf)
- *old_rpf = save_rpf;
- return PIM_RPF_CHANGED;
- }
- return PIM_RPF_OK;
- }
- /*
- RFC 4601: 4.1.6. State Summarization Macros
- neighbor RPF'(S,G) {
- if ( I_Am_Assert_Loser(S, G, RPF_interface(S) )) {
- return AssertWinner(S, G, RPF_interface(S) )
- } else {
- return NBR( RPF_interface(S), MRIB.next_hop( S ) )
- }
- }
- RPF'(*,G) and RPF'(S,G) indicate the neighbor from which data
- packets should be coming and to which joins should be sent on the RP
- tree and SPT, respectively.
- */
- static struct in_addr pim_rpf_find_rpf_addr(struct pim_upstream *up)
- {
- struct pim_ifchannel *rpf_ch;
- struct pim_neighbor *neigh;
- struct in_addr rpf_addr;
- if (!up->rpf.source_nexthop.interface) {
- char src_str[100];
- char grp_str[100];
- pim_inet4_dump("<src?>", up->source_addr, src_str, sizeof(src_str));
- pim_inet4_dump("<grp?>", up->group_addr, grp_str, sizeof(grp_str));
- zlog_warn("%s: missing RPF interface for upstream (S,G)=(%s,%s)",
- __PRETTY_FUNCTION__,
- src_str, grp_str);
- rpf_addr.s_addr = PIM_NET_INADDR_ANY;
- return rpf_addr;
- }
- rpf_ch = pim_ifchannel_find(up->rpf.source_nexthop.interface,
- up->source_addr, up->group_addr);
- if (rpf_ch) {
- if (rpf_ch->ifassert_state == PIM_IFASSERT_I_AM_LOSER) {
- return rpf_ch->ifassert_winner;
- }
- }
- /* return NBR( RPF_interface(S), MRIB.next_hop( S ) ) */
- neigh = pim_if_find_neighbor(up->rpf.source_nexthop.interface,
- up->rpf.source_nexthop.mrib_nexthop_addr);
- if (neigh)
- rpf_addr = neigh->source_addr;
- else
- rpf_addr.s_addr = PIM_NET_INADDR_ANY;
- return rpf_addr;
- }
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