16605f2fda
Master may free last DBDES packet immediately. Slave must wait dead interval before freeing last DBDES packet and then reject duplicate DBDES packets with SeqNumberMismatch.
673 lines
16 KiB
C
673 lines
16 KiB
C
/*
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* BIRD -- OSPF
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*
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* (c) 1999--2004 Ondrej Filip <feela@network.cz>
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* (c) 2009--2014 Ondrej Zajicek <santiago@crfreenet.org>
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* (c) 2009--2014 CZ.NIC z.s.p.o.
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include "ospf.h"
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const char *ospf_ns_names[] = {
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"Down", "Attempt", "Init", "2-Way", "ExStart", "Exchange", "Loading", "Full"
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};
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const char *ospf_inm_names[] = {
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"HelloReceived", "Start", "2-WayReceived", "NegotiationDone", "ExchangeDone",
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"BadLSReq", "LoadingDone", "AdjOK?", "SeqNumberMismatch", "1-WayReceived",
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"KillNbr", "InactivityTimer", "LLDown"
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};
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static int can_do_adj(struct ospf_neighbor *n);
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static void inactivity_timer_hook(timer * timer);
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static void dbdes_timer_hook(timer *t);
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static void lsrq_timer_hook(timer *t);
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static void lsrt_timer_hook(timer *t);
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static void ackd_timer_hook(timer *t);
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static void
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init_lists(struct ospf_proto *p, struct ospf_neighbor *n)
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{
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s_init_list(&(n->lsrql));
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n->lsrqi = SHEAD(n->lsrql);
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n->lsrqh = ospf_top_new(p, n->pool);
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s_init_list(&(n->lsrtl));
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n->lsrth = ospf_top_new(p, n->pool);
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}
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static void
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release_lsrtl(struct ospf_proto *p, struct ospf_neighbor *n)
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{
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struct top_hash_entry *ret, *en;
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WALK_SLIST(ret, n->lsrtl)
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{
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en = ospf_hash_find_entry(p->gr, ret);
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if (en)
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en->ret_count--;
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}
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}
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/* Resets LSA request and retransmit lists.
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* We do not reset DB summary list iterator here,
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* it is reset during entering EXCHANGE state.
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*/
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static void
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reset_lists(struct ospf_proto *p, struct ospf_neighbor *n)
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{
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release_lsrtl(p, n);
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ospf_top_free(n->lsrqh);
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ospf_top_free(n->lsrth);
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ospf_reset_lsack_queue(n);
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tm_stop(n->dbdes_timer);
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tm_stop(n->lsrq_timer);
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tm_stop(n->lsrt_timer);
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tm_stop(n->ackd_timer);
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init_lists(p, n);
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}
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struct ospf_neighbor *
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ospf_neighbor_new(struct ospf_iface *ifa)
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{
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struct ospf_proto *p = ifa->oa->po;
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struct pool *pool = rp_new(p->p.pool, "OSPF Neighbor");
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struct ospf_neighbor *n = mb_allocz(pool, sizeof(struct ospf_neighbor));
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n->pool = pool;
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n->ifa = ifa;
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add_tail(&ifa->neigh_list, NODE n);
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n->state = NEIGHBOR_DOWN;
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init_lists(p, n);
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s_init(&(n->dbsi), &(p->lsal));
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init_list(&n->ackl[ACKL_DIRECT]);
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init_list(&n->ackl[ACKL_DELAY]);
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n->inactim = tm_new_init(pool, inactivity_timer_hook, n, 0, 0);
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n->dbdes_timer = tm_new_init(pool, dbdes_timer_hook, n, ifa->rxmtint S, 0);
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n->lsrq_timer = tm_new_init(pool, lsrq_timer_hook, n, ifa->rxmtint S, 0);
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n->lsrt_timer = tm_new_init(pool, lsrt_timer_hook, n, ifa->rxmtint S, 0);
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n->ackd_timer = tm_new_init(pool, ackd_timer_hook, n, ifa->rxmtint S / 2, 0);
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return (n);
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}
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static void
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ospf_neigh_down(struct ospf_neighbor *n)
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{
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struct ospf_iface *ifa = n->ifa;
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struct ospf_proto *p = ifa->oa->po;
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u32 rid = n->rid;
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if ((ifa->type == OSPF_IT_NBMA) || (ifa->type == OSPF_IT_PTMP))
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{
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struct nbma_node *nn = find_nbma_node(ifa, n->ip);
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if (nn)
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nn->found = 0;
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}
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s_get(&(n->dbsi));
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release_lsrtl(p, n);
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rem_node(NODE n);
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rfree(n->pool);
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OSPF_TRACE(D_EVENTS, "Neighbor %R on %s removed", rid, ifa->ifname);
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}
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/**
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* ospf_neigh_chstate - handles changes related to new or lod state of neighbor
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* @n: OSPF neighbor
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* @state: new state
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*
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* Many actions have to be taken acording to a change of state of a neighbor. It
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* starts rxmt timers, call interface state machine etc.
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*/
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static void
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ospf_neigh_chstate(struct ospf_neighbor *n, u8 state)
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{
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struct ospf_iface *ifa = n->ifa;
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struct ospf_proto *p = ifa->oa->po;
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u8 old_state = n->state;
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int old_fadj = ifa->fadj;
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if (state == old_state)
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return;
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OSPF_TRACE(D_EVENTS, "Neighbor %R on %s changed state from %s to %s",
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n->rid, ifa->ifname, ospf_ns_names[old_state], ospf_ns_names[state]);
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n->state = state;
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/* Increase number of partial adjacencies */
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if ((state == NEIGHBOR_EXCHANGE) || (state == NEIGHBOR_LOADING))
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p->padj++;
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/* Decrease number of partial adjacencies */
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if ((old_state == NEIGHBOR_EXCHANGE) || (old_state == NEIGHBOR_LOADING))
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p->padj--;
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/* Increase number of full adjacencies */
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if (state == NEIGHBOR_FULL)
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ifa->fadj++;
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/* Decrease number of full adjacencies */
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if (old_state == NEIGHBOR_FULL)
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ifa->fadj--;
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if (ifa->fadj != old_fadj)
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{
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/* RFC 2328 12.4 Event 4 - neighbor enters/leaves Full state */
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ospf_notify_rt_lsa(ifa->oa);
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ospf_notify_net_lsa(ifa);
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/* RFC 2328 12.4 Event 8 - vlink state change */
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if (ifa->type == OSPF_IT_VLINK)
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ospf_notify_rt_lsa(ifa->voa);
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}
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if (state == NEIGHBOR_EXSTART)
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{
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/* First time adjacency attempt */
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if (old_state < NEIGHBOR_EXSTART)
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n->dds = random_u32();
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n->dds++;
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n->myimms = DBDES_IMMS;
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tm_start(n->dbdes_timer, 0);
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tm_start(n->ackd_timer, ifa->rxmtint S / 2);
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}
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if (state > NEIGHBOR_EXSTART)
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n->myimms &= ~DBDES_I;
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/* Generate NeighborChange event if needed, see RFC 2328 9.2 */
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if ((state == NEIGHBOR_2WAY) && (old_state < NEIGHBOR_2WAY))
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ospf_iface_sm(ifa, ISM_NEICH);
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if ((state < NEIGHBOR_2WAY) && (old_state >= NEIGHBOR_2WAY))
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ospf_iface_sm(ifa, ISM_NEICH);
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}
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/**
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* ospf_neigh_sm - ospf neighbor state machine
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* @n: neighor
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* @event: actual event
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*
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* This part implements the neighbor state machine as described in 10.3 of
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* RFC 2328. The only difference is that state %NEIGHBOR_ATTEMPT is not
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* used. We discover neighbors on nonbroadcast networks in the
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* same way as on broadcast networks. The only difference is in
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* sending hello packets. These are sent to IPs listed in
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* @ospf_iface->nbma_list .
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*/
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void
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ospf_neigh_sm(struct ospf_neighbor *n, int event)
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{
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struct ospf_proto *p = n->ifa->oa->po;
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DBG("Neighbor state machine for %R on %s, event %s\n",
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n->rid, n->ifa->ifname, ospf_inm_names[event]);
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switch (event)
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{
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case INM_START:
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ospf_neigh_chstate(n, NEIGHBOR_ATTEMPT);
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/* NBMA are used different way */
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break;
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case INM_HELLOREC:
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if (n->state < NEIGHBOR_INIT)
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ospf_neigh_chstate(n, NEIGHBOR_INIT);
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/* Restart inactivity timer */
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tm_start(n->inactim, n->ifa->deadint S);
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break;
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case INM_2WAYREC:
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if (n->state < NEIGHBOR_2WAY)
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ospf_neigh_chstate(n, NEIGHBOR_2WAY);
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if ((n->state == NEIGHBOR_2WAY) && can_do_adj(n))
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ospf_neigh_chstate(n, NEIGHBOR_EXSTART);
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break;
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case INM_NEGDONE:
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if (n->state == NEIGHBOR_EXSTART)
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{
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ospf_neigh_chstate(n, NEIGHBOR_EXCHANGE);
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/* Reset DB summary list iterator */
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s_get(&(n->dbsi));
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s_init(&(n->dbsi), &p->lsal);
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/* Add MaxAge LSA entries to retransmission list */
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ospf_add_flushed_to_lsrt(p, n);
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}
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else
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bug("NEGDONE and I'm not in EXSTART?");
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break;
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case INM_EXDONE:
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if (!EMPTY_SLIST(n->lsrql))
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ospf_neigh_chstate(n, NEIGHBOR_LOADING);
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else
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ospf_neigh_chstate(n, NEIGHBOR_FULL);
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break;
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case INM_LOADDONE:
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ospf_neigh_chstate(n, NEIGHBOR_FULL);
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break;
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case INM_ADJOK:
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/* Can In build adjacency? */
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if ((n->state == NEIGHBOR_2WAY) && can_do_adj(n))
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{
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ospf_neigh_chstate(n, NEIGHBOR_EXSTART);
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}
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else if ((n->state >= NEIGHBOR_EXSTART) && !can_do_adj(n))
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{
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reset_lists(p, n);
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ospf_neigh_chstate(n, NEIGHBOR_2WAY);
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}
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break;
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case INM_SEQMIS:
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case INM_BADLSREQ:
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if (n->state >= NEIGHBOR_EXCHANGE)
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{
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reset_lists(p, n);
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ospf_neigh_chstate(n, NEIGHBOR_EXSTART);
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}
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break;
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case INM_KILLNBR:
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case INM_LLDOWN:
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case INM_INACTTIM:
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/* No need for reset_lists() */
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ospf_neigh_chstate(n, NEIGHBOR_DOWN);
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ospf_neigh_down(n);
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break;
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case INM_1WAYREC:
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reset_lists(p, n);
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ospf_neigh_chstate(n, NEIGHBOR_INIT);
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break;
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default:
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bug("%s: INM - Unknown event?", p->p.name);
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break;
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}
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}
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static int
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can_do_adj(struct ospf_neighbor *n)
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{
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struct ospf_iface *ifa = n->ifa;
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struct ospf_proto *p = ifa->oa->po;
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int i = 0;
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switch (ifa->type)
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{
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case OSPF_IT_PTP:
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case OSPF_IT_PTMP:
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case OSPF_IT_VLINK:
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i = 1;
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break;
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case OSPF_IT_BCAST:
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case OSPF_IT_NBMA:
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switch (ifa->state)
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{
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case OSPF_IS_DOWN:
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case OSPF_IS_LOOP:
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bug("%s: Iface %s in down state?", p->p.name, ifa->ifname);
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break;
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case OSPF_IS_WAITING:
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DBG("%s: Neighbor? on iface %s\n", p->p.name, ifa->ifname);
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break;
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case OSPF_IS_DROTHER:
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if (((n->rid == ifa->drid) || (n->rid == ifa->bdrid))
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&& (n->state >= NEIGHBOR_2WAY))
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i = 1;
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break;
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case OSPF_IS_PTP:
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case OSPF_IS_BACKUP:
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case OSPF_IS_DR:
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if (n->state >= NEIGHBOR_2WAY)
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i = 1;
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break;
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default:
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bug("%s: Iface %s in unknown state?", p->p.name, ifa->ifname);
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break;
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}
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break;
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default:
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bug("%s: Iface %s is unknown type?", p->p.name, ifa->ifname);
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break;
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}
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DBG("%s: Iface %s can_do_adj=%d\n", p->p.name, ifa->ifname, i);
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return i;
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}
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static inline u32 neigh_get_id(struct ospf_proto *p, struct ospf_neighbor *n)
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{ return ospf_is_v2(p) ? ipa_to_u32(n->ip) : n->rid; }
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static struct ospf_neighbor *
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elect_bdr(struct ospf_proto *p, list nl)
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{
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struct ospf_neighbor *neigh, *n1, *n2;
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u32 nid;
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n1 = NULL;
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n2 = NULL;
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WALK_LIST(neigh, nl) /* First try those decl. themselves */
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{
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nid = neigh_get_id(p, neigh);
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if (neigh->state >= NEIGHBOR_2WAY) /* Higher than 2WAY */
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if (neigh->priority > 0) /* Eligible */
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if (neigh->dr != nid) /* And not decl. itself DR */
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{
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if (neigh->bdr == nid) /* Declaring BDR */
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{
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if (n1 != NULL)
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{
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if (neigh->priority > n1->priority)
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n1 = neigh;
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else if (neigh->priority == n1->priority)
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if (neigh->rid > n1->rid)
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n1 = neigh;
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}
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else
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{
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n1 = neigh;
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}
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}
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else /* And NOT declaring BDR */
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{
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if (n2 != NULL)
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{
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if (neigh->priority > n2->priority)
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n2 = neigh;
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else if (neigh->priority == n2->priority)
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if (neigh->rid > n2->rid)
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n2 = neigh;
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}
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else
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{
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n2 = neigh;
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}
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}
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}
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}
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if (n1 == NULL)
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n1 = n2;
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return (n1);
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}
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static struct ospf_neighbor *
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elect_dr(struct ospf_proto *p, list nl)
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{
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struct ospf_neighbor *neigh, *n;
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u32 nid;
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n = NULL;
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WALK_LIST(neigh, nl) /* And now DR */
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{
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nid = neigh_get_id(p, neigh);
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if (neigh->state >= NEIGHBOR_2WAY) /* Higher than 2WAY */
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if (neigh->priority > 0) /* Eligible */
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if (neigh->dr == nid) /* And declaring itself DR */
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{
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if (n != NULL)
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{
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if (neigh->priority > n->priority)
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n = neigh;
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else if (neigh->priority == n->priority)
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if (neigh->rid > n->rid)
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n = neigh;
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}
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else
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{
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n = neigh;
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}
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}
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}
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return (n);
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}
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/**
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* ospf_dr_election - (Backup) Designed Router election
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* @ifa: actual interface
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*
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* When the wait timer fires, it is time to elect (Backup) Designated Router.
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* Structure describing me is added to this list so every electing router has
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* the same list. Backup Designated Router is elected before Designated
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* Router. This process is described in 9.4 of RFC 2328. The function is
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* supposed to be called only from ospf_iface_sm() as a part of the interface
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* state machine.
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*/
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void
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ospf_dr_election(struct ospf_iface *ifa)
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{
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struct ospf_proto *p = ifa->oa->po;
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struct ospf_neighbor *neigh, *ndr, *nbdr, me;
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u32 myid = p->router_id;
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DBG("(B)DR election.\n");
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me.state = NEIGHBOR_2WAY;
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me.rid = myid;
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me.priority = ifa->priority;
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me.ip = ifa->addr->ip;
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me.dr = ospf_is_v2(p) ? ipa_to_u32(ifa->drip) : ifa->drid;
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me.bdr = ospf_is_v2(p) ? ipa_to_u32(ifa->bdrip) : ifa->bdrid;
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me.iface_id = ifa->iface_id;
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add_tail(&ifa->neigh_list, NODE & me);
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nbdr = elect_bdr(p, ifa->neigh_list);
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ndr = elect_dr(p, ifa->neigh_list);
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if (ndr == NULL)
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ndr = nbdr;
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/* 9.4. (4) */
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if (((ifa->drid == myid) && (ndr != &me))
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|| ((ifa->drid != myid) && (ndr == &me))
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|| ((ifa->bdrid == myid) && (nbdr != &me))
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|| ((ifa->bdrid != myid) && (nbdr == &me)))
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{
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me.dr = ndr ? neigh_get_id(p, ndr) : 0;
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me.bdr = nbdr ? neigh_get_id(p, nbdr) : 0;
|
|
|
|
nbdr = elect_bdr(p, ifa->neigh_list);
|
|
ndr = elect_dr(p, ifa->neigh_list);
|
|
|
|
if (ndr == NULL)
|
|
ndr = nbdr;
|
|
}
|
|
|
|
rem_node(NODE & me);
|
|
|
|
|
|
u32 old_drid = ifa->drid;
|
|
u32 old_bdrid = ifa->bdrid;
|
|
ip_addr none = ospf_is_v2(p) ? IPA_NONE4 : IPA_NONE6;
|
|
|
|
ifa->drid = ndr ? ndr->rid : 0;
|
|
ifa->drip = ndr ? ndr->ip : none;
|
|
ifa->dr_iface_id = ndr ? ndr->iface_id : 0;
|
|
|
|
ifa->bdrid = nbdr ? nbdr->rid : 0;
|
|
ifa->bdrip = nbdr ? nbdr->ip : none;
|
|
|
|
DBG("DR=%R, BDR=%R\n", ifa->drid, ifa->bdrid);
|
|
|
|
/* We are part of the interface state machine */
|
|
if (ifa->drid == myid)
|
|
ospf_iface_chstate(ifa, OSPF_IS_DR);
|
|
else if (ifa->bdrid == myid)
|
|
ospf_iface_chstate(ifa, OSPF_IS_BACKUP);
|
|
else
|
|
ospf_iface_chstate(ifa, OSPF_IS_DROTHER);
|
|
|
|
/* Review neighbor adjacencies if DR or BDR changed */
|
|
if ((ifa->drid != old_drid) || (ifa->bdrid != old_bdrid))
|
|
WALK_LIST(neigh, ifa->neigh_list)
|
|
if (neigh->state >= NEIGHBOR_2WAY)
|
|
ospf_neigh_sm(neigh, INM_ADJOK);
|
|
|
|
/* RFC 2328 12.4 Event 3 - DR change */
|
|
if (ifa->drid != old_drid)
|
|
ospf_notify_rt_lsa(ifa->oa);
|
|
}
|
|
|
|
struct ospf_neighbor *
|
|
find_neigh(struct ospf_iface *ifa, u32 rid)
|
|
{
|
|
struct ospf_neighbor *n;
|
|
WALK_LIST(n, ifa->neigh_list)
|
|
if (n->rid == rid)
|
|
return n;
|
|
return NULL;
|
|
}
|
|
|
|
struct ospf_neighbor *
|
|
find_neigh_by_ip(struct ospf_iface *ifa, ip_addr ip)
|
|
{
|
|
struct ospf_neighbor *n;
|
|
WALK_LIST(n, ifa->neigh_list)
|
|
if (ipa_equal(n->ip, ip))
|
|
return n;
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
inactivity_timer_hook(timer * timer)
|
|
{
|
|
struct ospf_neighbor *n = (struct ospf_neighbor *) timer->data;
|
|
struct ospf_proto *p = n->ifa->oa->po;
|
|
|
|
OSPF_TRACE(D_EVENTS, "Inactivity timer expired for nbr %R on %s",
|
|
n->rid, n->ifa->ifname);
|
|
ospf_neigh_sm(n, INM_INACTTIM);
|
|
}
|
|
|
|
static void
|
|
ospf_neigh_bfd_hook(struct bfd_request *req)
|
|
{
|
|
struct ospf_neighbor *n = req->data;
|
|
struct ospf_proto *p = n->ifa->oa->po;
|
|
|
|
if (req->down)
|
|
{
|
|
OSPF_TRACE(D_EVENTS, "BFD session down for nbr %R on %s",
|
|
n->rid, n->ifa->ifname);
|
|
ospf_neigh_sm(n, INM_INACTTIM);
|
|
}
|
|
}
|
|
|
|
void
|
|
ospf_neigh_update_bfd(struct ospf_neighbor *n, int use_bfd)
|
|
{
|
|
if (use_bfd && !n->bfd_req)
|
|
n->bfd_req = bfd_request_session(n->pool, n->ip, n->ifa->addr->ip, n->ifa->iface,
|
|
ospf_neigh_bfd_hook, n);
|
|
|
|
if (!use_bfd && n->bfd_req)
|
|
{
|
|
rfree(n->bfd_req);
|
|
n->bfd_req = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
dbdes_timer_hook(timer *t)
|
|
{
|
|
struct ospf_neighbor *n = t->data;
|
|
struct ospf_proto *p = n->ifa->oa->po;
|
|
|
|
// OSPF_TRACE(D_EVENTS, "DBDES timer expired for nbr %R on %s", n->rid, n->ifa->ifname);
|
|
|
|
if (n->state == NEIGHBOR_EXSTART)
|
|
ospf_send_dbdes(p, n);
|
|
|
|
if ((n->state == NEIGHBOR_EXCHANGE) && (n->myimms & DBDES_MS))
|
|
ospf_rxmt_dbdes(p, n);
|
|
|
|
if ((n->state > NEIGHBOR_LOADING) && !(n->myimms & DBDES_MS))
|
|
{
|
|
ospf_reset_ldd(p, n);
|
|
tm_stop(n->dbdes_timer);
|
|
}
|
|
}
|
|
|
|
static void
|
|
lsrq_timer_hook(timer *t)
|
|
{
|
|
struct ospf_neighbor *n = t->data;
|
|
struct ospf_proto *p = n->ifa->oa->po;
|
|
|
|
// OSPF_TRACE(D_EVENTS, "LSRQ timer expired for nbr %R on %s", n->rid, n->ifa->ifname);
|
|
|
|
if ((n->state >= NEIGHBOR_EXCHANGE) && !EMPTY_SLIST(n->lsrql))
|
|
ospf_send_lsreq(p, n);
|
|
}
|
|
|
|
static void
|
|
lsrt_timer_hook(timer *t)
|
|
{
|
|
struct ospf_neighbor *n = t->data;
|
|
struct ospf_proto *p = n->ifa->oa->po;
|
|
|
|
// OSPF_TRACE(D_EVENTS, "LSRT timer expired for nbr %R on %s", n->rid, n->ifa->ifname);
|
|
|
|
if ((n->state >= NEIGHBOR_EXCHANGE) && !EMPTY_SLIST(n->lsrtl))
|
|
ospf_rxmt_lsupd(p, n);
|
|
}
|
|
|
|
static void
|
|
ackd_timer_hook(timer *t)
|
|
{
|
|
struct ospf_neighbor *n = t->data;
|
|
struct ospf_proto *p = n->ifa->oa->po;
|
|
|
|
ospf_send_lsack(p, n, ACKL_DELAY);
|
|
}
|
|
|
|
|
|
void
|
|
ospf_sh_neigh_info(struct ospf_neighbor *n)
|
|
{
|
|
struct ospf_iface *ifa = n->ifa;
|
|
char *pos = "PtP ";
|
|
|
|
if ((ifa->type == OSPF_IT_BCAST) || (ifa->type == OSPF_IT_NBMA))
|
|
{
|
|
if (n->rid == ifa->drid)
|
|
pos = "DR ";
|
|
else if (n->rid == ifa->bdrid)
|
|
pos = "BDR ";
|
|
else
|
|
pos = "Other";
|
|
}
|
|
|
|
cli_msg(-1013, "%-1R\t%3u\t%s/%s\t%7t\t%-10s %-1I",
|
|
n->rid, n->priority, ospf_ns_names[n->state], pos,
|
|
tm_remains(n->inactim), ifa->ifname, n->ip);
|
|
}
|