mirror of
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239 lines
5.6 KiB
C
239 lines
5.6 KiB
C
/*
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* BIRD -- OSPF
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*
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* (c) 1999 - 2000 Ondrej Filip <feela@network.cz>
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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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fill_ospf_pkt_hdr(struct ospf_iface *ifa, void *buf, u8 h_type)
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{
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struct ospf_packet *pkt;
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struct proto *p;
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p=(struct proto *)(ifa->proto);
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pkt=(struct ospf_packet *)buf;
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pkt->version=OSPF_VERSION;
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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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}
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void
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ospf_tx_authenticate(struct ospf_iface *ifa, struct ospf_packet *pkt)
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{
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int i;
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pkt->autype=ifa->autype;
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memcpy(pkt->authetication, ifa->aukey, 8);
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return;
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}
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int
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ospf_rx_authenticate(struct ospf_iface *ifa, struct ospf_packet *pkt)
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{
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int i;
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if(pkt->autype!=ifa->autype) return 0;
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if(ifa->autype==AU_NONE) return 1;
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if(ifa->autype==AU_SIMPLE)
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{
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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]) return 0;
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}
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return 1;
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}
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return 0;
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}
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void
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ospf_pkt_finalize(struct ospf_iface *ifa, struct ospf_packet *pkt)
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{
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ospf_tx_authenticate(ifa, pkt);
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/* Count checksum */
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pkt->checksum=ipsum_calculate(pkt,sizeof(struct ospf_packet)-8,
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(pkt+1),ntohs(pkt->length)-sizeof(struct ospf_packet),NULL);
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}
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/**
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* ospf_rx_hook
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* @sk: socket we recived the packet. Its ignored.
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* @size: size of the packet
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*
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* This in entry point for messages from neighbors. Many checks (like
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* autnetication, checksums, size) are done before packet is passed to
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* non generic functions.
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*/
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int
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ospf_rx_hook(sock *sk, int size)
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{
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#ifndef IPV6
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struct ospf_packet *ps;
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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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int i;
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u8 *pu8;
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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, 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", 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(ps->areaid!=ifa->an)
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{
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log("%s: Bad OSPF packet received: other area %ld", p->name, 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!", 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.", 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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/* Dump packet
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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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case HELLO_P:
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DBG("%s: Hello received.\n", p->name);
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ospf_hello_rx((struct ospf_hello_packet *)ps, p, ifa, size, sk->faddr);
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break;
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case DBDES_P:
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DBG("%s: Database description received.\n", p->name);
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ospf_dbdes_rx((struct ospf_dbdes_packet *)ps, p, ifa, size);
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break;
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case LSREQ_P:
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DBG("%s: Link state request received.\n", p->name);
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ospf_lsreq_rx((struct ospf_lsreq_packet *)ps, p, ifa, size);
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break;
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case LSUPD_P:
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DBG("%s: Link state update received.\n", p->name);
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ospf_lsupd_rx((struct ospf_lsupd_packet *)ps, p, ifa, size);
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break;
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case LSACK_P:
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DBG("%s: Link state ack received.\n", p->name);
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ospf_lsack_rx((struct ospf_lsack_packet *)ps, p, ifa, size);
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break;
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default:
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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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#else
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#error RX_Hook does not work for IPv6 now.
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#endif
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return(1);
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}
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void
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ospf_tx_hook(sock *sk)
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{
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struct ospf_iface *ifa;
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struct proto *p;
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ifa=(struct ospf_iface *)(sk->data);
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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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}
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void
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ospf_err_hook(sock *sk, int err)
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{
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struct ospf_iface *ifa;
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struct proto *p;
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ifa=(struct ospf_iface *)(sk->data);
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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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}
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void
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sk_send_to_agt(sock *sk, u16 len, struct ospf_iface *ifa, u8 state)
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{
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struct ospf_neighbor *n;
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WALK_LIST(NODE n,ifa->neigh_list)
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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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void
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sk_send_to_bdr(sock *sk, u16 len, struct ospf_iface *ifa)
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{
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struct ospf_neighbor *n;
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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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}
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