1999-11-17 15:50:41 +00:00
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/*
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* BIRD -- OSPF
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*
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2003-09-14 13:41:24 +00:00
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* (c) 1999 - 2003 Ondrej Filip <feela@network.cz>
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1999-11-17 15:50:41 +00:00
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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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void
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2003-09-14 13:41:24 +00:00
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fill_ospf_pkt_hdr (struct ospf_iface *ifa, void *buf, u8 h_type)
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1999-11-17 15:50:41 +00:00
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{
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struct ospf_packet *pkt;
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struct proto *p;
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2003-09-14 13:41:24 +00:00
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p = (struct proto *) (ifa->proto);
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1999-11-17 15:50:41 +00:00
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2003-09-14 13:41:24 +00:00
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pkt = (struct ospf_packet *) buf;
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1999-11-17 15:50:41 +00:00
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2003-09-14 13:41:24 +00:00
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pkt->version = OSPF_VERSION;
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1999-11-17 15:50:41 +00:00
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2003-09-14 13:41:24 +00:00
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pkt->type = h_type;
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pkt->routerid = htonl (p->cf->global->router_id);
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pkt->areaid = htonl (ifa->an);
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pkt->autype = htons (ifa->autype);
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pkt->checksum = 0;
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1999-11-17 15:50:41 +00:00
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}
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void
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2003-09-14 13:41:24 +00:00
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ospf_tx_authenticate (struct ospf_iface *ifa, struct ospf_packet *pkt)
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1999-11-17 15:50:41 +00:00
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{
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2003-09-14 13:41:24 +00:00
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pkt->autype = htons (ifa->autype);
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memcpy (pkt->authetication, ifa->aukey, 8);
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1999-11-17 15:50:41 +00:00
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return;
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}
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2000-06-06 01:23:03 +00:00
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int
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2003-09-14 13:41:24 +00:00
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ospf_rx_authenticate (struct ospf_iface *ifa, struct ospf_packet *pkt)
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2000-06-06 01:23:03 +00:00
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{
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int i;
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2003-09-14 13:41:24 +00:00
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if (pkt->autype != htons (ifa->autype))
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return 0;
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if (ifa->autype == AU_NONE)
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return 1;
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if (ifa->autype == AU_SIMPLE)
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2000-06-06 01:23:03 +00:00
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{
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2003-09-14 13:41:24 +00:00
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for (i = 0; i < 8; i++)
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{
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if (pkt->authetication[i] != ifa->aukey[i])
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return 0;
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}
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return 1;
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2000-06-06 01:23:03 +00:00
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}
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return 0;
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}
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1999-11-17 15:50:41 +00:00
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void
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2003-09-14 13:41:24 +00:00
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ospf_pkt_finalize (struct ospf_iface *ifa, struct ospf_packet *pkt)
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1999-11-17 15:50:41 +00:00
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{
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2003-09-14 13:41:24 +00:00
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ospf_tx_authenticate (ifa, pkt);
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1999-11-17 15:50:41 +00:00
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/* Count checksum */
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2003-09-14 13:41:24 +00:00
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pkt->checksum = ipsum_calculate (pkt, sizeof (struct ospf_packet) - 8,
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(pkt + 1),
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ntohs (pkt->length) -
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sizeof (struct ospf_packet), NULL);
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1999-11-17 15:50:41 +00:00
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}
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2000-06-07 21:56:32 +00:00
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/**
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* ospf_rx_hook
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2003-08-23 10:42:41 +00:00
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* @sk: socket we received the packet. Its ignored.
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2000-06-07 21:56:32 +00:00
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* @size: size of the packet
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*
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2003-08-23 10:42:41 +00:00
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* This is the entry point for messages from neighbors. Many checks (like
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* authentication, checksums, size) are done before the packet is passed to
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2000-06-07 21:56:32 +00:00
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* non generic functions.
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*/
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1999-11-17 15:50:41 +00:00
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int
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2004-06-04 17:49:25 +00:00
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ospf_rx_hook (sock *sk, int size)
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1999-11-17 15:50:41 +00:00
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{
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#ifndef IPV6
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struct ospf_packet *ps;
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2003-09-14 13:41:24 +00:00
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struct ospf_iface *ifa = (struct ospf_iface *) (sk->data);
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struct proto *p = (struct proto *) (ifa->proto);
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1999-11-17 15:50:41 +00:00
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2003-09-14 13:41:24 +00:00
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if (ifa->stub)
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return (1);
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DBG ("%s: RX_Hook called on interface %s.\n", p->name, sk->iface->name);
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ps = (struct ospf_packet *) ipv4_skip_header (sk->rbuf, &size);
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if (ps == NULL)
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{
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log ("%s: Bad OSPF packet received: bad IP header", p->name);
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log ("%s: Discarding", p->name);
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return (1);
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}
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if ((unsigned) size < sizeof (struct ospf_packet))
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{
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log ("%s: Bad OSPF packet received: too short (%u bytes)", p->name,
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size);
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log ("%s: Discarding", p->name);
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return (1);
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}
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if ((ntohs (ps->length) != size) || (size != (4 * (size / 4))))
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{
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log ("%s: Bad OSPF packet received: size field does not match",
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p->name);
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log ("%s: Discarding", p->name);
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return (1);
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}
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if (ps->version != OSPF_VERSION)
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{
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log ("%s: Bad OSPF packet received: version %u", p->name, ps->version);
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log ("%s: Discarding", p->name);
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return (1);
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}
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if (!ipsum_verify (ps, 16, (void *) ps + sizeof (struct ospf_packet),
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ntohs (ps->length) - sizeof (struct ospf_packet), NULL))
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{
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log ("%s: Bad OSPF packet received: bad checksum", p->name);
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log ("%s: Discarding", p->name);
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return (1);
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}
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if (!ospf_rx_authenticate (ifa, ps))
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{
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log ("%s: Bad OSPF packet received: bad password", p->name);
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return (1);
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}
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if (ntohl (ps->areaid) != ifa->an)
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{
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log ("%s: Bad OSPF packet received: other area %ld", p->name,
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ps->areaid);
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log ("%s: Discarding", p->name);
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return (1);
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}
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if (ntohl (ps->routerid) == p->cf->global->router_id)
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{
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log ("%s: Bad OSPF packet received: received my own router ID!",
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p->name);
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log ("%s: Discarding", p->name);
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return (1);
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}
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if (ntohl (ps->routerid) == 0)
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{
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log ("%s: Bad OSPF packet received: Id 0.0.0.0 is not allowed.",
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p->name);
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log ("%s: Discarding", p->name);
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return (1);
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}
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2000-06-07 21:56:32 +00:00
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/* Dump packet
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2003-09-14 13:41:24 +00:00
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pu8=(u8 *)(sk->rbuf+5*4);
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for(i=0;i<ntohs(ps->length);i+=4)
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DBG("%s: received %u,%u,%u,%u\n",p->name, pu8[i+0], pu8[i+1], pu8[i+2],
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pu8[i+3]);
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DBG("%s: received size: %u\n",p->name,size);
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*/
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switch (ps->type)
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{
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2000-06-03 01:29:00 +00:00
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case HELLO_P:
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2003-09-14 13:41:24 +00:00
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DBG ("%s: Hello received.\n", p->name);
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2004-06-04 17:12:27 +00:00
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ospf_hello_receive((struct ospf_hello_packet *) ps, ifa, size,
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2003-09-14 13:41:24 +00:00
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sk->faddr);
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1999-11-17 15:50:41 +00:00
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break;
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2000-06-03 01:29:00 +00:00
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case DBDES_P:
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2003-09-14 13:41:24 +00:00
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DBG ("%s: Database description received.\n", p->name);
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2004-06-04 17:49:25 +00:00
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ospf_dbdes_receive ((struct ospf_dbdes_packet *) ps, ifa, size);
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1999-11-17 15:50:41 +00:00
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break;
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2000-06-03 01:29:00 +00:00
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case LSREQ_P:
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2003-09-14 13:41:24 +00:00
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DBG ("%s: Link state request received.\n", p->name);
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2004-06-04 17:28:41 +00:00
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ospf_lsreq_receive((struct ospf_lsreq_packet *) ps, ifa, size);
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1999-11-17 15:50:41 +00:00
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break;
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2000-06-03 01:29:00 +00:00
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case LSUPD_P:
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2003-09-14 13:41:24 +00:00
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DBG ("%s: Link state update received.\n", p->name);
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2004-06-04 20:41:02 +00:00
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ospf_lsupd_receive((struct ospf_lsupd_packet *) ps, ifa, size);
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1999-11-17 15:50:41 +00:00
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break;
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2000-06-03 01:29:00 +00:00
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case LSACK_P:
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2003-09-14 13:41:24 +00:00
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DBG ("%s: Link state ack received.\n", p->name);
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2004-06-04 17:05:24 +00:00
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ospf_lsack_receive((struct ospf_lsack_packet *) ps, ifa, size);
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1999-11-17 15:50:41 +00:00
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break;
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default:
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2003-09-14 13:41:24 +00:00
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log ("%s: Bad packet received: wrong type %u", p->name, ps->type);
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log ("%s: Discarding\n", p->name);
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return (1);
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};
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1999-11-17 15:50:41 +00:00
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#else
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#error RX_Hook does not work for IPv6 now.
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#endif
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2003-09-14 13:41:24 +00:00
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return (1);
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1999-11-17 15:50:41 +00:00
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}
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void
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2003-09-14 13:41:24 +00:00
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ospf_tx_hook (sock * sk)
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1999-11-17 15:50:41 +00:00
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{
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struct ospf_iface *ifa;
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struct proto *p;
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2003-09-14 13:41:24 +00:00
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ifa = (struct ospf_iface *) (sk->data);
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1999-11-17 15:50:41 +00:00
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2003-09-14 13:41:24 +00:00
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p = (struct proto *) (ifa->proto);
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DBG ("%s: TX_Hook called on interface %s\n", p->name, sk->iface->name);
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1999-11-17 15:50:41 +00:00
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}
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void
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2004-06-05 09:28:17 +00:00
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ospf_err_hook (sock * sk, int err UNUSED)
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1999-11-17 15:50:41 +00:00
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{
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struct ospf_iface *ifa;
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struct proto *p;
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2003-09-14 13:41:24 +00:00
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ifa = (struct ospf_iface *) (sk->data);
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1999-11-17 15:50:41 +00:00
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2003-09-14 13:41:24 +00:00
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p = (struct proto *) (ifa->proto);
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DBG ("%s: Err_Hook called on interface %s\n", p->name, sk->iface->name);
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1999-11-17 15:50:41 +00:00
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}
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2000-04-18 01:06:16 +00:00
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void
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2003-09-14 13:41:24 +00:00
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sk_send_to_agt (sock * sk, u16 len, struct ospf_iface *ifa, u8 state)
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2000-04-18 01:06:16 +00:00
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{
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struct ospf_neighbor *n;
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2003-09-14 13:41:24 +00:00
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WALK_LIST (NODE n, ifa->neigh_list) if (n->state >= state)
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sk_send_to (sk, len, n->ip, OSPF_PROTO);
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}
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2000-06-06 00:08:27 +00:00
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void
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2003-09-14 13:41:24 +00:00
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sk_send_to_bdr (sock * sk, u16 len, struct ospf_iface *ifa)
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2000-06-06 00:08:27 +00:00
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{
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2003-09-14 13:41:24 +00:00
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if (ipa_compare (ifa->drip, ipa_from_u32 (0)) != 0)
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sk_send_to (sk, len, ifa->drip, OSPF_PROTO);
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if (ipa_compare (ifa->bdrip, ipa_from_u32 (0)) != 0)
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sk_send_to (sk, len, ifa->bdrip, OSPF_PROTO);
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2000-06-06 00:08:27 +00:00
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}
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