mirror of
https://gitlab.labs.nic.cz/labs/bird.git
synced 2024-05-11 16:54:54 +00:00
Temporary integrated OSPF commit.
This commit is contained in:
Ondrej Zajicek
@@ -2,6 +2,8 @@
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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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@@ -9,25 +11,26 @@
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#include "ospf.h"
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#ifdef OSPFv2
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struct ospf_hello_packet
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struct ospf_hello2_packet
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{
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struct ospf_packet ospf_packet;
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ip_addr netmask;
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struct ospf_packet hdr;
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union ospf_auth auth;
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u32 netmask;
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u16 helloint;
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u8 options;
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u8 priority;
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u32 deadint;
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u32 dr;
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u32 bdr;
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u32 neighbors[];
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};
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#endif
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#ifdef OSPFv3
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struct ospf_hello_packet
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struct ospf_hello3_packet
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{
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struct ospf_packet ospf_packet;
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struct ospf_packet hdr;
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u32 iface_id;
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u8 priority;
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u8 options3;
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@@ -37,286 +40,92 @@ struct ospf_hello_packet
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u16 deadint;
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u32 dr;
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u32 bdr;
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u32 neighbors[];
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};
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#endif
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void
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ospf_hello_receive(struct ospf_packet *ps_i, struct ospf_iface *ifa,
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struct ospf_neighbor *n, ip_addr faddr)
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ospf_send_hello(struct ospf_iface *ifa, int kind, struct ospf_neighbor *dirn)
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{
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struct proto_ospf *po = ifa->oa->po;
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struct proto *p = &po->proto;
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char *beg = "OSPF: Bad HELLO packet from ";
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unsigned int size, i, twoway, peers;
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u32 tmp;
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u32 *pnrid;
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size = ntohs(ps_i->length);
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if (size < sizeof(struct ospf_hello_packet))
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{
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log(L_ERR "%s%I - too short (%u B)", beg, faddr, size);
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return;
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}
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struct ospf_hello_packet *ps = (void *) ps_i;
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OSPF_TRACE(D_PACKETS, "HELLO packet received from %I via %s", faddr, ifa->ifname);
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#ifdef OSPFv2
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ip_addr mask = ps->netmask;
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ipa_ntoh(mask);
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if ((ifa->type != OSPF_IT_VLINK) &&
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(ifa->type != OSPF_IT_PTP) &&
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!ipa_equal(mask, ipa_mkmask(ifa->addr->pxlen)))
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{
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log(L_ERR "%s%I - netmask mismatch (%I)", beg, faddr, mask);
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return;
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}
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#endif
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tmp = ntohs(ps->helloint);
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if (tmp != ifa->helloint)
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{
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log(L_ERR "%s%I - hello interval mismatch (%d)", beg, faddr, tmp);
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return;
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}
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#ifdef OSPFv2
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tmp = ntohl(ps->deadint);
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#else /* OSPFv3 */
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tmp = ntohs(ps->deadint);
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#endif
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if (tmp != ifa->deadint)
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{
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log(L_ERR "%s%I - dead interval mismatch (%d)", beg, faddr, tmp);
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return;
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}
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/* Check whether bits E, N match */
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if ((ps->options ^ ifa->oa->options) & (OPT_E | OPT_N))
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{
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log(L_ERR "%s%I - area type mismatch (%x)", beg, faddr, ps->options);
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return;
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}
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#ifdef OSPFv2
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if (n && (n->rid != ntohl(ps_i->routerid)))
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{
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OSPF_TRACE(D_EVENTS,
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"Neighbor %I has changed router id from %R to %R.",
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n->ip, n->rid, ntohl(ps_i->routerid));
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ospf_neigh_remove(n);
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n = NULL;
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}
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#endif
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if (!n)
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{
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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, faddr);
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if (!nn && ifa->strictnbma)
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{
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log(L_WARN "Ignoring new neighbor: %I on %s", faddr, ifa->ifname);
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return;
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}
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if (nn && (ifa->type == OSPF_IT_NBMA) &&
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(((ps->priority == 0) && nn->eligible) ||
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((ps->priority > 0) && !nn->eligible)))
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{
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log(L_ERR "Eligibility mismatch for neighbor: %I on %s", faddr, ifa->ifname);
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return;
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}
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if (nn)
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nn->found = 1;
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}
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OSPF_TRACE(D_EVENTS, "New neighbor found: %I on %s", faddr, ifa->ifname);
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n = ospf_neighbor_new(ifa);
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n->rid = ntohl(ps_i->routerid);
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n->ip = faddr;
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n->dr = ntohl(ps->dr);
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n->bdr = ntohl(ps->bdr);
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n->priority = ps->priority;
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#ifdef OSPFv3
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n->iface_id = ntohl(ps->iface_id);
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#endif
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if (n->ifa->cf->bfd)
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ospf_neigh_update_bfd(n, n->ifa->bfd);
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}
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#ifdef OSPFv3 /* NOTE: this could also be relevant for OSPFv2 on PtP ifaces */
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else if (!ipa_equal(faddr, n->ip))
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{
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OSPF_TRACE(D_EVENTS, "Neighbor address changed from %I to %I", n->ip, faddr);
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n->ip = faddr;
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}
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#endif
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ospf_neigh_sm(n, INM_HELLOREC);
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pnrid = (u32 *) ((struct ospf_hello_packet *) (ps + 1));
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peers = (size - sizeof(struct ospf_hello_packet))/ sizeof(u32);
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twoway = 0;
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for (i = 0; i < peers; i++)
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{
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if (ntohl(pnrid[i]) == po->router_id)
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{
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DBG("%s: Twoway received from %I\n", p->name, faddr);
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ospf_neigh_sm(n, INM_2WAYREC);
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twoway = 1;
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break;
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}
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}
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if (!twoway)
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ospf_neigh_sm(n, INM_1WAYREC);
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u32 olddr = n->dr;
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u32 oldbdr = n->bdr;
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u32 oldpriority = n->priority;
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#ifdef OSPFv3
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u32 oldiface_id = n->iface_id;
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#endif
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n->dr = ntohl(ps->dr);
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n->bdr = ntohl(ps->bdr);
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n->priority = ps->priority;
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#ifdef OSPFv3
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n->iface_id = ntohl(ps->iface_id);
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#endif
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/* Check priority change */
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if (n->state >= NEIGHBOR_2WAY)
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{
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#ifdef OSPFv2
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u32 neigh = ipa_to_u32(n->ip);
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#else /* OSPFv3 */
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u32 neigh = n->rid;
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#endif
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if (n->priority != oldpriority)
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ospf_iface_sm(ifa, ISM_NEICH);
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#ifdef OSPFv3
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if (n->iface_id != oldiface_id)
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ospf_iface_sm(ifa, ISM_NEICH);
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#endif
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/* Neighbor is declaring itself ad DR and there is no BDR */
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if ((n->dr == neigh) && (n->bdr == 0)
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&& (n->state != NEIGHBOR_FULL))
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ospf_iface_sm(ifa, ISM_BACKS);
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/* Neighbor is declaring itself as BDR */
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if ((n->bdr == neigh) && (n->state != NEIGHBOR_FULL))
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ospf_iface_sm(ifa, ISM_BACKS);
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/* Neighbor is newly declaring itself as DR or BDR */
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if (((n->dr == neigh) && (n->dr != olddr))
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|| ((n->bdr == neigh) && (n->bdr != oldbdr)))
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ospf_iface_sm(ifa, ISM_NEICH);
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/* Neighbor is no more declaring itself as DR or BDR */
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if (((olddr == neigh) && (n->dr != olddr))
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|| ((oldbdr == neigh) && (n->bdr != oldbdr)))
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ospf_iface_sm(ifa, ISM_NEICH);
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}
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if (ifa->type == OSPF_IT_NBMA)
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{
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if ((ifa->priority == 0) && (n->priority > 0))
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ospf_hello_send(n->ifa, OHS_HELLO, n);
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}
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ospf_neigh_sm(n, INM_HELLOREC);
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}
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void
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ospf_hello_send(struct ospf_iface *ifa, int kind, struct ospf_neighbor *dirn)
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{
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struct ospf_hello_packet *pkt;
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struct ospf_packet *op;
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struct proto *p;
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struct ospf_proto *p = ifa->oa->po;
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struct ospf_packet *pkt;
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struct ospf_neighbor *neigh, *n1;
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u16 length;
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int i;
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struct nbma_node *nb;
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u32 *neighbors;
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uint length;
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int i, max;
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if (ifa->state <= OSPF_IS_LOOP)
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return;
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if (ifa->stub)
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return; /* Don't send any packet on stub iface */
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return;
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p = (struct proto *) (ifa->oa->po);
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DBG("%s: Hello/Poll timer fired on interface %s with IP %I\n",
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p->name, ifa->ifname, ifa->addr->ip);
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/* Now we should send a hello packet */
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pkt = ospf_tx_buffer(ifa);
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op = &pkt->ospf_packet;
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/* Now fill ospf_hello header */
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ospf_pkt_fill_hdr(ifa, pkt, HELLO_P);
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#ifdef OSPFv2
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pkt->netmask = ipa_mkmask(ifa->addr->pxlen);
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ipa_hton(pkt->netmask);
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if ((ifa->type == OSPF_IT_VLINK) ||
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((ifa->type == OSPF_IT_PTP) && !ifa->ptp_netmask))
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pkt->netmask = IPA_NONE;
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#endif
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if (ospf_is_v2(p))
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{
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struct ospf_hello2_packet *ps = (void *) pkt;
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pkt->helloint = ntohs(ifa->helloint);
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pkt->priority = ifa->priority;
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if ((ifa->type == OSPF_IT_VLINK) ||
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((ifa->type == OSPF_IT_PTP) && !ifa->ptp_netmask))
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ps->netmask = 0;
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else
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ps->netmask = htonl(u32_mkmask(ifa->addr->pxlen));
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#ifdef OSPFv3
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pkt->iface_id = htonl(ifa->iface_id);
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ps->helloint = ntohs(ifa->helloint);
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ps->options = ifa->oa->options;
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ps->priority = ifa->priority;
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ps->deadint = htonl(ifa->deadint);
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ps->dr = htonl(ipa_to_u32(ifa->drip));
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ps->bdr = htonl(ipa_to_u32(ifa->bdrip));
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pkt->options3 = ifa->oa->options >> 16;
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pkt->options2 = ifa->oa->options >> 8;
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#endif
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pkt->options = ifa->oa->options;
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length = sizeof(struct ospf_hello2_packet);
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neighbors = ps->neighbors;
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}
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else
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{
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struct ospf_hello3_packet *ps = (void *) pkt;
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#ifdef OSPFv2
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pkt->deadint = htonl(ifa->deadint);
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pkt->dr = htonl(ipa_to_u32(ifa->drip));
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pkt->bdr = htonl(ipa_to_u32(ifa->bdrip));
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#else /* OSPFv3 */
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pkt->deadint = htons(ifa->deadint);
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pkt->dr = htonl(ifa->drid);
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pkt->bdr = htonl(ifa->bdrid);
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#endif
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ps->iface_id = htonl(ifa->iface_id);
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ps->priority = ifa->priority;
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ps->options3 = ifa->oa->options >> 16;
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ps->options2 = ifa->oa->options >> 8;
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ps->options = ifa->oa->options;
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ps->helloint = ntohs(ifa->helloint);
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ps->deadint = htons(ifa->deadint);
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ps->dr = htonl(ifa->drid);
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ps->bdr = htonl(ifa->bdrid);
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length = sizeof(struct ospf_hello3_packet);
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neighbors = ps->neighbors;
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}
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i = 0;
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max = (ospf_pkt_maxsize(ifa) - length) / sizeof(u32);
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/* Fill all neighbors */
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i = 0;
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if (kind != OHS_SHUTDOWN)
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{
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u32 *pp = (u32 *) (((u8 *) pkt) + sizeof(struct ospf_hello_packet));
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WALK_LIST(neigh, ifa->neigh_list)
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{
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if ((i+1) * sizeof(u32) + sizeof(struct ospf_hello_packet) > ospf_pkt_maxsize(ifa))
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if (i == max)
|
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{
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log(L_WARN "%s: Too many neighbors on interface %s", p->name, ifa->ifname);
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log(L_WARN "%s: Too many neighbors on interface %s", p->p.name, ifa->ifname);
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break;
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}
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*(pp + i) = htonl(neigh->rid);
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neighbors[i] = htonl(neigh->rid);
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i++;
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}
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}
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length = sizeof(struct ospf_hello_packet) + i * sizeof(u32);
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op->length = htons(length);
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length += i * sizeof(u32);
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pkt->length = htons(length);
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OSPF_TRACE(D_PACKETS, "HELLO packet sent via %s", ifa->ifname);
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|
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switch(ifa->type)
|
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{
|
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@@ -369,8 +178,226 @@ ospf_hello_send(struct ospf_iface *ifa, int kind, struct ospf_neighbor *dirn)
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break;
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default:
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bug("Bug in ospf_hello_send()");
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bug("Bug in ospf_send_hello()");
|
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}
|
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}
|
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|
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|
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void
|
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ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa,
|
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struct ospf_neighbor *n, ip_addr faddr)
|
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{
|
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struct ospf_proto *p = ifa->oa->po;
|
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char *beg = "OSPF: Bad HELLO packet from ";
|
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u32 rcv_iface_id, rcv_helloint, rcv_deadint, rcv_dr, rcv_bdr;
|
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u8 rcv_options, rcv_priority;
|
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u32 *neighbors;
|
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u32 neigh_count;
|
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uint plen, i;
|
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|
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/* RFC 2328 10.5 */
|
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|
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OSPF_TRACE(D_PACKETS, "HELLO packet received from %I via %s", faddr, ifa->ifname);
|
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|
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plen = ntohs(pkt->length);
|
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|
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if (ospf_is_v2(p))
|
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{
|
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struct ospf_hello2_packet *ps = (void *) pkt;
|
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|
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if (plen < sizeof(struct ospf_hello2_packet))
|
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{
|
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log(L_ERR "%s%I - too short (%u B)", beg, faddr, plen);
|
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return;
|
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}
|
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|
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rcv_iface_id = 0;
|
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rcv_helloint = ntohs(ps->helloint);
|
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rcv_deadint = ntohl(ps->deadint);
|
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rcv_dr = ntohl(ps->dr);
|
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rcv_bdr = ntohl(ps->bdr);
|
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rcv_options = ps->options;
|
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rcv_priority = ps->priority;
|
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|
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int pxlen = u32_masklen(ntohl(ps->netmask));
|
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if ((ifa->type != OSPF_IT_VLINK) &&
|
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(ifa->type != OSPF_IT_PTP) &&
|
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(pxlen != ifa->addr->pxlen))
|
||||
{
|
||||
log(L_ERR "%s%I - prefix length mismatch (%d)", beg, faddr, pxlen);
|
||||
return;
|
||||
}
|
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|
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neighbors = ps->neighbors;
|
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neigh_count = (plen - sizeof(struct ospf_hello2_packet)) / sizeof(u32);
|
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}
|
||||
else /* OSPFv3 */
|
||||
{
|
||||
struct ospf_hello3_packet *ps = (void *) pkt;
|
||||
|
||||
if (plen < sizeof(struct ospf_hello3_packet))
|
||||
{
|
||||
log(L_ERR "%s%I - too short (%u B)", beg, faddr, plen);
|
||||
return;
|
||||
}
|
||||
|
||||
rcv_iface_id = ntohl(ps->iface_id);
|
||||
rcv_helloint = ntohs(ps->helloint);
|
||||
rcv_deadint = ntohs(ps->deadint);
|
||||
rcv_dr = ntohl(ps->dr);
|
||||
rcv_bdr = ntohl(ps->bdr);
|
||||
rcv_options = ps->options;
|
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rcv_priority = ps->priority;
|
||||
|
||||
neighbors = ps->neighbors;
|
||||
neigh_count = (plen - sizeof(struct ospf_hello3_packet)) / sizeof(u32);
|
||||
}
|
||||
|
||||
OSPF_TRACE(D_PACKETS, "HELLO packet sent via %s", ifa->ifname);
|
||||
if (rcv_helloint != ifa->helloint)
|
||||
{
|
||||
log(L_ERR "%s%I - hello interval mismatch (%d)", beg, faddr, rcv_helloint);
|
||||
return;
|
||||
}
|
||||
|
||||
if (rcv_deadint != ifa->deadint)
|
||||
{
|
||||
log(L_ERR "%s%I - dead interval mismatch (%d)", beg, faddr, rcv_deadint);
|
||||
return;
|
||||
}
|
||||
|
||||
/* Check whether bits E, N match */
|
||||
if ((rcv_options ^ ifa->oa->options) & (OPT_E | OPT_N))
|
||||
{
|
||||
log(L_ERR "%s%I - area type mismatch (%x)", beg, faddr, rcv_options);
|
||||
return;
|
||||
}
|
||||
|
||||
/* Check consistency of existing neighbor entry */
|
||||
if (n)
|
||||
{
|
||||
unsigned t = ifa->type;
|
||||
if (ospf_is_v2(p) && ((t == OSPF_IT_BCAST) || (t == OSPF_IT_NBMA) || (t == OSPF_IT_PTMP)))
|
||||
{
|
||||
/* Neighbor identified by IP address; Router ID may change */
|
||||
if (n->rid != ntohl(pkt->routerid))
|
||||
{
|
||||
OSPF_TRACE(D_EVENTS, "Neighbor %I has changed Router ID from %R to %R",
|
||||
n->ip, n->rid, ntohl(pkt->routerid));
|
||||
ospf_neigh_remove(n);
|
||||
n = NULL;
|
||||
}
|
||||
}
|
||||
else /* OSPFv3 or OSPFv2/PtP */
|
||||
{
|
||||
/* Neighbor identified by Router ID; IP address may change */
|
||||
if (!ipa_equal(faddr, n->ip))
|
||||
{
|
||||
OSPF_TRACE(D_EVENTS, "Neighbor address changed from %I to %I", n->ip, faddr);
|
||||
n->ip = faddr;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (!n)
|
||||
{
|
||||
if ((ifa->type == OSPF_IT_NBMA) || (ifa->type == OSPF_IT_PTMP))
|
||||
{
|
||||
struct nbma_node *nn = find_nbma_node(ifa, faddr);
|
||||
|
||||
if (!nn && ifa->strictnbma)
|
||||
{
|
||||
log(L_WARN "Ignoring new neighbor: %I on %s", faddr, ifa->ifname);
|
||||
return;
|
||||
}
|
||||
|
||||
if (nn && (ifa->type == OSPF_IT_NBMA) &&
|
||||
(((rcv_priority == 0) && nn->eligible) ||
|
||||
((rcv_priority > 0) && !nn->eligible)))
|
||||
{
|
||||
log(L_ERR "Eligibility mismatch for neighbor: %I on %s", faddr, ifa->ifname);
|
||||
return;
|
||||
}
|
||||
|
||||
if (nn)
|
||||
nn->found = 1;
|
||||
}
|
||||
|
||||
OSPF_TRACE(D_EVENTS, "New neighbor found: %I on %s", faddr, ifa->ifname);
|
||||
|
||||
n = ospf_neighbor_new(ifa);
|
||||
|
||||
n->rid = ntohl(pkt->routerid);
|
||||
n->ip = faddr;
|
||||
n->dr = rcv_dr;
|
||||
n->bdr = rcv_bdr;
|
||||
n->priority = rcv_priority;
|
||||
n->iface_id = rcv_iface_id;
|
||||
|
||||
if (n->ifa->cf->bfd)
|
||||
ospf_neigh_update_bfd(n, n->ifa->bfd);
|
||||
}
|
||||
|
||||
u32 n_id = ospf_is_v2(p) ? ipa_to_u32(n->ip) : n->rid;
|
||||
|
||||
u32 old_dr = n->dr;
|
||||
u32 old_bdr = n->bdr;
|
||||
u32 old_priority = n->priority;
|
||||
u32 old_iface_id = n->iface_id;
|
||||
|
||||
n->dr = rcv_dr;
|
||||
n->bdr = rcv_bdr;
|
||||
n->priority = rcv_priority;
|
||||
n->iface_id = rcv_iface_id;
|
||||
|
||||
|
||||
/* Update inactivity timer */
|
||||
ospf_neigh_sm(n, INM_HELLOREC);
|
||||
|
||||
/* RFC 2328 9.5.1 - non-eligible routers reply to hello on NBMA nets */
|
||||
if (ifa->type == OSPF_IT_NBMA)
|
||||
if ((ifa->priority == 0) && (n->priority > 0))
|
||||
ospf_send_hello(n->ifa, OHS_HELLO, n);
|
||||
|
||||
|
||||
/* Examine list of neighbors */
|
||||
for (i = 0; i < neigh_count; i++)
|
||||
if (neighbors[i] == htonl(p->router_id))
|
||||
goto found_self;
|
||||
|
||||
ospf_neigh_sm(n, INM_1WAYREC);
|
||||
return;
|
||||
|
||||
found_self:
|
||||
ospf_neigh_sm(n, INM_2WAYREC);
|
||||
|
||||
|
||||
if (n->iface_id != old_iface_id)
|
||||
{
|
||||
/* If neighbor is DR, also update cached DR interface ID */
|
||||
if (ifa->drid == n->rid)
|
||||
ifa->dr_iface_id = n->iface_id;
|
||||
|
||||
/* RFC 5340 4.4.3 Event 4 - change of neighbor's interface ID */
|
||||
ospf_notify_rt_lsa(ifa->oa);
|
||||
|
||||
/* Missed in RFC 5340 4.4.3 Event 4 - (Px-)Net-LSA uses iface_id to ref Link-LSAs */
|
||||
ospf_notify_net_lsa(ifa);
|
||||
}
|
||||
|
||||
if (ifa->state == OSPF_IS_WAITING)
|
||||
{
|
||||
/* Neighbor is declaring itself DR (and there is no BDR) or as BDR */
|
||||
if (((n->dr == n_id) && (n->bdr == 0)) || (n->bdr == n_id))
|
||||
ospf_iface_sm(ifa, ISM_BACKS);
|
||||
}
|
||||
else if (ifa->state >= OSPF_IS_DROTHER)
|
||||
{
|
||||
/* Neighbor changed priority or started/stopped declaring itself as DR/BDR */
|
||||
if ((n->priority != old_priority) ||
|
||||
((n->dr == n_id) && (old_dr != n_id)) ||
|
||||
((n->dr != n_id) && (old_dr == n_id)) ||
|
||||
((n->bdr == n_id) && (old_bdr != n_id)) ||
|
||||
((n->bdr != n_id) && (old_bdr == n_id)))
|
||||
ospf_iface_sm(ifa, ISM_NEICH);
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user