Annotation of embedaddon/quagga/pimd/pim_rpf.c, revision 1.1
1.1 ! misho 1: /*
! 2: PIM for Quagga
! 3: Copyright (C) 2008 Everton da Silva Marques
! 4:
! 5: This program is free software; you can redistribute it and/or modify
! 6: it under the terms of the GNU General Public License as published by
! 7: the Free Software Foundation; either version 2 of the License, or
! 8: (at your option) any later version.
! 9:
! 10: This program is distributed in the hope that it will be useful, but
! 11: WITHOUT ANY WARRANTY; without even the implied warranty of
! 12: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
! 13: General Public License for more details.
! 14:
! 15: You should have received a copy of the GNU General Public License
! 16: along with this program; see the file COPYING; if not, write to the
! 17: Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
! 18: MA 02110-1301 USA
! 19:
! 20: $QuaggaId: $Format:%an, %ai, %h$ $
! 21: */
! 22:
! 23: #include <zebra.h>
! 24:
! 25: #include "log.h"
! 26: #include "prefix.h"
! 27: #include "memory.h"
! 28:
! 29: #include "pimd.h"
! 30: #include "pim_rpf.h"
! 31: #include "pim_pim.h"
! 32: #include "pim_str.h"
! 33: #include "pim_iface.h"
! 34: #include "pim_zlookup.h"
! 35: #include "pim_ifchannel.h"
! 36:
! 37: static struct in_addr pim_rpf_find_rpf_addr(struct pim_upstream *up);
! 38:
! 39: int pim_nexthop_lookup(struct pim_nexthop *nexthop,
! 40: struct in_addr addr)
! 41: {
! 42: struct pim_zlookup_nexthop nexthop_tab[PIM_NEXTHOP_IFINDEX_TAB_SIZE];
! 43: int num_ifindex;
! 44: struct interface *ifp;
! 45: int first_ifindex;
! 46:
! 47: num_ifindex = zclient_lookup_nexthop(qpim_zclient_lookup, nexthop_tab,
! 48: PIM_NEXTHOP_IFINDEX_TAB_SIZE,
! 49: addr, PIM_NEXTHOP_LOOKUP_MAX);
! 50: if (num_ifindex < 1) {
! 51: char addr_str[100];
! 52: pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
! 53: zlog_warn("%s %s: could not find nexthop ifindex for address %s",
! 54: __FILE__, __PRETTY_FUNCTION__,
! 55: addr_str);
! 56: return -1;
! 57: }
! 58:
! 59: first_ifindex = nexthop_tab[0].ifindex;
! 60:
! 61: if (num_ifindex > 1) {
! 62: char addr_str[100];
! 63: pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
! 64: zlog_info("%s %s: FIXME ignoring multiple nexthop ifindex'es num_ifindex=%d for address %s (using only ifindex=%d)",
! 65: __FILE__, __PRETTY_FUNCTION__,
! 66: num_ifindex, addr_str, first_ifindex);
! 67: /* debug warning only, do not return */
! 68: }
! 69:
! 70: ifp = if_lookup_by_index(first_ifindex);
! 71: if (!ifp) {
! 72: char addr_str[100];
! 73: pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
! 74: zlog_warn("%s %s: could not find interface for ifindex %d (address %s)",
! 75: __FILE__, __PRETTY_FUNCTION__,
! 76: first_ifindex, addr_str);
! 77: return -2;
! 78: }
! 79:
! 80: if (!ifp->info) {
! 81: char addr_str[100];
! 82: pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
! 83: zlog_warn("%s: multicast not enabled on input interface %s (ifindex=%d, RPF for source %s)",
! 84: __PRETTY_FUNCTION__,
! 85: ifp->name, first_ifindex, addr_str);
! 86: /* debug warning only, do not return */
! 87: }
! 88:
! 89: if (PIM_DEBUG_PIM_TRACE) {
! 90: char nexthop_str[100];
! 91: char addr_str[100];
! 92: pim_inet4_dump("<nexthop?>", nexthop_tab[0].nexthop_addr, nexthop_str, sizeof(nexthop_str));
! 93: pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
! 94: zlog_debug("%s %s: found nexthop %s for address %s: interface %s ifindex=%d metric=%d pref=%d",
! 95: __FILE__, __PRETTY_FUNCTION__,
! 96: nexthop_str, addr_str,
! 97: ifp->name, first_ifindex,
! 98: nexthop_tab[0].route_metric,
! 99: nexthop_tab[0].protocol_distance);
! 100: }
! 101:
! 102: /* update nextop data */
! 103: nexthop->interface = ifp;
! 104: nexthop->mrib_nexthop_addr = nexthop_tab[0].nexthop_addr;
! 105: nexthop->mrib_metric_preference = nexthop_tab[0].protocol_distance;
! 106: nexthop->mrib_route_metric = nexthop_tab[0].route_metric;
! 107:
! 108: return 0;
! 109: }
! 110:
! 111: static int nexthop_mismatch(const struct pim_nexthop *nh1,
! 112: const struct pim_nexthop *nh2)
! 113: {
! 114: return (nh1->interface != nh2->interface)
! 115: ||
! 116: (nh1->mrib_nexthop_addr.s_addr != nh2->mrib_nexthop_addr.s_addr)
! 117: ||
! 118: (nh1->mrib_metric_preference != nh2->mrib_metric_preference)
! 119: ||
! 120: (nh1->mrib_route_metric != nh2->mrib_route_metric);
! 121: }
! 122:
! 123: enum pim_rpf_result pim_rpf_update(struct pim_upstream *up,
! 124: struct in_addr *old_rpf_addr)
! 125: {
! 126: struct in_addr save_rpf_addr;
! 127: struct pim_nexthop save_nexthop;
! 128: struct pim_rpf *rpf = &up->rpf;
! 129:
! 130: save_nexthop = rpf->source_nexthop; /* detect change in pim_nexthop */
! 131: save_rpf_addr = rpf->rpf_addr; /* detect change in RPF'(S,G) */
! 132:
! 133: if (pim_nexthop_lookup(&rpf->source_nexthop,
! 134: up->source_addr)) {
! 135: return PIM_RPF_FAILURE;
! 136: }
! 137:
! 138: rpf->rpf_addr = pim_rpf_find_rpf_addr(up);
! 139: if (PIM_INADDR_IS_ANY(rpf->rpf_addr) && PIM_DEBUG_PIM_EVENTS) {
! 140: /* RPF'(S,G) not found */
! 141: char src_str[100];
! 142: char grp_str[100];
! 143: pim_inet4_dump("<src?>", up->source_addr, src_str, sizeof(src_str));
! 144: pim_inet4_dump("<grp?>", up->group_addr, grp_str, sizeof(grp_str));
! 145: zlog_debug("%s %s: RPF'(%s,%s) not found: won't send join upstream",
! 146: __FILE__, __PRETTY_FUNCTION__,
! 147: src_str, grp_str);
! 148: /* warning only */
! 149: }
! 150:
! 151: /* detect change in pim_nexthop */
! 152: if (nexthop_mismatch(&rpf->source_nexthop, &save_nexthop)) {
! 153:
! 154: if (PIM_DEBUG_PIM_EVENTS) {
! 155: char src_str[100];
! 156: char grp_str[100];
! 157: char nhaddr_str[100];
! 158: pim_inet4_dump("<src?>", up->source_addr, src_str, sizeof(src_str));
! 159: pim_inet4_dump("<grp?>", up->group_addr, grp_str, sizeof(grp_str));
! 160: pim_inet4_dump("<addr?>", rpf->source_nexthop.mrib_nexthop_addr, nhaddr_str, sizeof(nhaddr_str));
! 161: zlog_debug("%s %s: (S,G)=(%s,%s) source nexthop now is: interface=%s address=%s pref=%d metric=%d",
! 162: __FILE__, __PRETTY_FUNCTION__,
! 163: src_str, grp_str,
! 164: rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<ifname?>",
! 165: nhaddr_str,
! 166: rpf->source_nexthop.mrib_metric_preference,
! 167: rpf->source_nexthop.mrib_route_metric);
! 168: /* warning only */
! 169: }
! 170:
! 171: pim_upstream_update_join_desired(up);
! 172: pim_upstream_update_could_assert(up);
! 173: pim_upstream_update_my_assert_metric(up);
! 174: }
! 175:
! 176: /* detect change in RPF_interface(S) */
! 177: if (save_nexthop.interface != rpf->source_nexthop.interface) {
! 178:
! 179: if (PIM_DEBUG_PIM_EVENTS) {
! 180: char src_str[100];
! 181: char grp_str[100];
! 182: pim_inet4_dump("<src?>", up->source_addr, src_str, sizeof(src_str));
! 183: pim_inet4_dump("<grp?>", up->group_addr, grp_str, sizeof(grp_str));
! 184: zlog_debug("%s %s: (S,G)=(%s,%s) RPF_interface(S) changed from %s to %s",
! 185: __FILE__, __PRETTY_FUNCTION__,
! 186: src_str, grp_str,
! 187: save_nexthop.interface ? save_nexthop.interface->name : "<oldif?>",
! 188: rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<newif?>");
! 189: /* warning only */
! 190: }
! 191:
! 192: pim_upstream_rpf_interface_changed(up, save_nexthop.interface);
! 193: }
! 194:
! 195: /* detect change in RPF'(S,G) */
! 196: if (save_rpf_addr.s_addr != rpf->rpf_addr.s_addr) {
! 197:
! 198: /* return old rpf to caller ? */
! 199: if (old_rpf_addr)
! 200: *old_rpf_addr = save_rpf_addr;
! 201:
! 202: return PIM_RPF_CHANGED;
! 203: }
! 204:
! 205: return PIM_RPF_OK;
! 206: }
! 207:
! 208: /*
! 209: RFC 4601: 4.1.6. State Summarization Macros
! 210:
! 211: neighbor RPF'(S,G) {
! 212: if ( I_Am_Assert_Loser(S, G, RPF_interface(S) )) {
! 213: return AssertWinner(S, G, RPF_interface(S) )
! 214: } else {
! 215: return NBR( RPF_interface(S), MRIB.next_hop( S ) )
! 216: }
! 217: }
! 218:
! 219: RPF'(*,G) and RPF'(S,G) indicate the neighbor from which data
! 220: packets should be coming and to which joins should be sent on the RP
! 221: tree and SPT, respectively.
! 222: */
! 223: static struct in_addr pim_rpf_find_rpf_addr(struct pim_upstream *up)
! 224: {
! 225: struct pim_ifchannel *rpf_ch;
! 226: struct pim_neighbor *neigh;
! 227: struct in_addr rpf_addr;
! 228:
! 229: if (!up->rpf.source_nexthop.interface) {
! 230: char src_str[100];
! 231: char grp_str[100];
! 232: pim_inet4_dump("<src?>", up->source_addr, src_str, sizeof(src_str));
! 233: pim_inet4_dump("<grp?>", up->group_addr, grp_str, sizeof(grp_str));
! 234: zlog_warn("%s: missing RPF interface for upstream (S,G)=(%s,%s)",
! 235: __PRETTY_FUNCTION__,
! 236: src_str, grp_str);
! 237:
! 238: rpf_addr.s_addr = PIM_NET_INADDR_ANY;
! 239: return rpf_addr;
! 240: }
! 241:
! 242: rpf_ch = pim_ifchannel_find(up->rpf.source_nexthop.interface,
! 243: up->source_addr, up->group_addr);
! 244: if (rpf_ch) {
! 245: if (rpf_ch->ifassert_state == PIM_IFASSERT_I_AM_LOSER) {
! 246: return rpf_ch->ifassert_winner;
! 247: }
! 248: }
! 249:
! 250: /* return NBR( RPF_interface(S), MRIB.next_hop( S ) ) */
! 251:
! 252: neigh = pim_if_find_neighbor(up->rpf.source_nexthop.interface,
! 253: up->rpf.source_nexthop.mrib_nexthop_addr);
! 254: if (neigh)
! 255: rpf_addr = neigh->source_addr;
! 256: else
! 257: rpf_addr.s_addr = PIM_NET_INADDR_ANY;
! 258:
! 259: return rpf_addr;
! 260: }
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