diff options
| -rw-r--r-- | proto/ospf/packet.c | 292 |
1 files changed, 151 insertions, 141 deletions
diff --git a/proto/ospf/packet.c b/proto/ospf/packet.c index 5f2d628..750f3a3 100644 --- a/proto/ospf/packet.c +++ b/proto/ospf/packet.c @@ -1,7 +1,7 @@ /* * BIRD -- OSPF * - * (c) 1999 - 2000 Ondrej Filip <feela@network.cz> + * (c) 1999 - 2003 Ondrej Filip <feela@network.cz> * * Can be freely distributed and used under the terms of the GNU GPL. */ @@ -9,60 +9,65 @@ #include "ospf.h" void -fill_ospf_pkt_hdr(struct ospf_iface *ifa, void *buf, u8 h_type) +fill_ospf_pkt_hdr (struct ospf_iface *ifa, void *buf, u8 h_type) { struct ospf_packet *pkt; struct proto *p; - - p=(struct proto *)(ifa->proto); - pkt=(struct ospf_packet *)buf; + p = (struct proto *) (ifa->proto); - pkt->version=OSPF_VERSION; + pkt = (struct ospf_packet *) buf; - pkt->type=h_type; + pkt->version = OSPF_VERSION; - pkt->routerid=htonl(p->cf->global->router_id); - pkt->areaid=htonl(ifa->an); - pkt->autype=htons(ifa->autype); - pkt->checksum=0; + pkt->type = h_type; + + pkt->routerid = htonl (p->cf->global->router_id); + pkt->areaid = htonl (ifa->an); + pkt->autype = htons (ifa->autype); + pkt->checksum = 0; } void -ospf_tx_authenticate(struct ospf_iface *ifa, struct ospf_packet *pkt) +ospf_tx_authenticate (struct ospf_iface *ifa, struct ospf_packet *pkt) { int i; - pkt->autype=ifa->autype; - memcpy(pkt->authetication, ifa->aukey, 8); + pkt->autype = htons (ifa->autype); + memcpy (pkt->authetication, ifa->aukey, 8); return; } int -ospf_rx_authenticate(struct ospf_iface *ifa, struct ospf_packet *pkt) +ospf_rx_authenticate (struct ospf_iface *ifa, struct ospf_packet *pkt) { int i; - if(pkt->autype!=ifa->autype) return 0; - if(ifa->autype==AU_NONE) return 1; - if(ifa->autype==AU_SIMPLE) - { - for(i=0;i<8;i++) + if (pkt->autype != htons (ifa->autype)) + return 0; + if (ifa->autype == AU_NONE) + return 1; + if (ifa->autype == AU_SIMPLE) { - if(pkt->authetication[i]!=ifa->aukey[i]) return 0; + for (i = 0; i < 8; i++) + { + if (pkt->authetication[i] != ifa->aukey[i]) + return 0; + } + return 1; } - return 1; - } return 0; } void -ospf_pkt_finalize(struct ospf_iface *ifa, struct ospf_packet *pkt) +ospf_pkt_finalize (struct ospf_iface *ifa, struct ospf_packet *pkt) { - ospf_tx_authenticate(ifa, pkt); + ospf_tx_authenticate (ifa, pkt); /* Count checksum */ - pkt->checksum=ipsum_calculate(pkt,sizeof(struct ospf_packet)-8, - (pkt+1),ntohs(pkt->length)-sizeof(struct ospf_packet),NULL); + pkt->checksum = ipsum_calculate (pkt, sizeof (struct ospf_packet) - 8, + (pkt + 1), + ntohs (pkt->length) - + sizeof (struct ospf_packet), NULL); } /** @@ -75,166 +80,171 @@ ospf_pkt_finalize(struct ospf_iface *ifa, struct ospf_packet *pkt) * non generic functions. */ int -ospf_rx_hook(sock *sk, int size) +ospf_rx_hook (sock * sk, int size) { #ifndef IPV6 struct ospf_packet *ps; - struct ospf_iface *ifa=(struct ospf_iface *)(sk->data); - struct proto *p=(struct proto *)(ifa->proto); + struct ospf_iface *ifa = (struct ospf_iface *) (sk->data); + struct proto *p = (struct proto *) (ifa->proto); int i; u8 *pu8; - if(ifa->stub) return(1); - - DBG("%s: RX_Hook called on interface %s.\n",p->name, sk->iface->name); - - ps = (struct ospf_packet *) ipv4_skip_header(sk->rbuf, &size); - if(ps==NULL) - { - log("%s: Bad OSPF packet received: bad IP header", p->name); - log("%s: Discarding",p->name); - return(1); - } - - if((unsigned)size < sizeof(struct ospf_packet)) - { - log("%s: Bad OSPF packet received: too short (%u bytes)", p->name, size); - log("%s: Discarding",p->name); - return(1); - } - - if((ntohs(ps->length)!=size)||(size!=(4*(size/4)))) - { - log("%s: Bad OSPF packet received: size field does not match", p->name); - log("%s: Discarding",p->name); - return(1); - } - - if(ps->version!=OSPF_VERSION) - { - log("%s: Bad OSPF packet received: version %u", p->name, ps->version); - log("%s: Discarding",p->name); - return(1); - } - - if(!ipsum_verify(ps, 16,(void *)ps+sizeof(struct ospf_packet), - ntohs(ps->length)-sizeof(struct ospf_packet), NULL)) - { - log("%s: Bad OSPF packet received: bad checksum", p->name); - log("%s: Discarding",p->name); - return(1); - } - - if(!ospf_rx_authenticate(ifa,ps)) - { - log("%s: Bad OSPF packet received: bad password", p->name); - return(1); - } - - if(ntohl(ps->areaid)!=ifa->an) - { - log("%s: Bad OSPF packet received: other area %ld", p->name, ps->areaid); - log("%s: Discarding",p->name); - return(1); - } - - if(ntohl(ps->routerid)==p->cf->global->router_id) - { - log("%s: Bad OSPF packet received: received my own router ID!", p->name); - log("%s: Discarding",p->name); - return(1); - } - - if(ntohl(ps->routerid)==0) - { - log("%s: Bad OSPF packet received: Id 0.0.0.0 is not allowed.", p->name); - log("%s: Discarding",p->name); - return(1); - } - + if (ifa->stub) + return (1); + + DBG ("%s: RX_Hook called on interface %s.\n", p->name, sk->iface->name); + + ps = (struct ospf_packet *) ipv4_skip_header (sk->rbuf, &size); + if (ps == NULL) + { + log ("%s: Bad OSPF packet received: bad IP header", p->name); + log ("%s: Discarding", p->name); + return (1); + } + + if ((unsigned) size < sizeof (struct ospf_packet)) + { + log ("%s: Bad OSPF packet received: too short (%u bytes)", p->name, + size); + log ("%s: Discarding", p->name); + return (1); + } + + if ((ntohs (ps->length) != size) || (size != (4 * (size / 4)))) + { + log ("%s: Bad OSPF packet received: size field does not match", + p->name); + log ("%s: Discarding", p->name); + return (1); + } + + if (ps->version != OSPF_VERSION) + { + log ("%s: Bad OSPF packet received: version %u", p->name, ps->version); + log ("%s: Discarding", p->name); + return (1); + } + + if (!ipsum_verify (ps, 16, (void *) ps + sizeof (struct ospf_packet), + ntohs (ps->length) - sizeof (struct ospf_packet), NULL)) + { + log ("%s: Bad OSPF packet received: bad checksum", p->name); + log ("%s: Discarding", p->name); + return (1); + } + + if (!ospf_rx_authenticate (ifa, ps)) + { + log ("%s: Bad OSPF packet received: bad password", p->name); + return (1); + } + + if (ntohl (ps->areaid) != ifa->an) + { + log ("%s: Bad OSPF packet received: other area %ld", p->name, + ps->areaid); + log ("%s: Discarding", p->name); + return (1); + } + + if (ntohl (ps->routerid) == p->cf->global->router_id) + { + log ("%s: Bad OSPF packet received: received my own router ID!", + p->name); + log ("%s: Discarding", p->name); + return (1); + } + + if (ntohl (ps->routerid) == 0) + { + log ("%s: Bad OSPF packet received: Id 0.0.0.0 is not allowed.", + p->name); + log ("%s: Discarding", p->name); + return (1); + } + /* Dump packet - pu8=(u8 *)(sk->rbuf+5*4); - for(i=0;i<ntohs(ps->length);i+=4) - DBG("%s: received %u,%u,%u,%u\n",p->name, pu8[i+0], pu8[i+1], pu8[i+2], - pu8[i+3]); - DBG("%s: received size: %u\n",p->name,size); - */ - - switch(ps->type) - { + pu8=(u8 *)(sk->rbuf+5*4); + for(i=0;i<ntohs(ps->length);i+=4) + DBG("%s: received %u,%u,%u,%u\n",p->name, pu8[i+0], pu8[i+1], pu8[i+2], + pu8[i+3]); + DBG("%s: received size: %u\n",p->name,size); + */ + + switch (ps->type) + { case HELLO_P: - DBG("%s: Hello received.\n", p->name); - ospf_hello_rx((struct ospf_hello_packet *)ps, p, ifa, size, sk->faddr); + DBG ("%s: Hello received.\n", p->name); + ospf_hello_rx ((struct ospf_hello_packet *) ps, p, ifa, size, + sk->faddr); break; case DBDES_P: - DBG("%s: Database description received.\n", p->name); - ospf_dbdes_rx((struct ospf_dbdes_packet *)ps, p, ifa, size); + DBG ("%s: Database description received.\n", p->name); + ospf_dbdes_rx ((struct ospf_dbdes_packet *) ps, p, ifa, size); break; case LSREQ_P: - DBG("%s: Link state request received.\n", p->name); - ospf_lsreq_rx((struct ospf_lsreq_packet *)ps, p, ifa, size); + DBG ("%s: Link state request received.\n", p->name); + ospf_lsreq_rx ((struct ospf_lsreq_packet *) ps, p, ifa, size); break; case LSUPD_P: - DBG("%s: Link state update received.\n", p->name); - ospf_lsupd_rx((struct ospf_lsupd_packet *)ps, p, ifa, size); + DBG ("%s: Link state update received.\n", p->name); + ospf_lsupd_rx ((struct ospf_lsupd_packet *) ps, p, ifa, size); break; case LSACK_P: - DBG("%s: Link state ack received.\n", p->name); - ospf_lsack_rx((struct ospf_lsack_packet *)ps, p, ifa, size); + DBG ("%s: Link state ack received.\n", p->name); + ospf_lsack_rx ((struct ospf_lsack_packet *) ps, p, ifa, size); break; default: - log("%s: Bad packet received: wrong type %u", p->name, ps->type); - log("%s: Discarding\n",p->name); - return(1); - }; + log ("%s: Bad packet received: wrong type %u", p->name, ps->type); + log ("%s: Discarding\n", p->name); + return (1); + }; #else #error RX_Hook does not work for IPv6 now. #endif - return(1); + return (1); } void -ospf_tx_hook(sock *sk) +ospf_tx_hook (sock * sk) { struct ospf_iface *ifa; struct proto *p; - ifa=(struct ospf_iface *)(sk->data); + ifa = (struct ospf_iface *) (sk->data); - p=(struct proto *)(ifa->proto); - DBG("%s: TX_Hook called on interface %s\n", p->name,sk->iface->name); + p = (struct proto *) (ifa->proto); + DBG ("%s: TX_Hook called on interface %s\n", p->name, sk->iface->name); } void -ospf_err_hook(sock *sk, int err) +ospf_err_hook (sock * sk, int err) { struct ospf_iface *ifa; struct proto *p; - ifa=(struct ospf_iface *)(sk->data); + ifa = (struct ospf_iface *) (sk->data); - p=(struct proto *)(ifa->proto); - DBG("%s: Err_Hook called on interface %s\n", p->name,sk->iface->name); + p = (struct proto *) (ifa->proto); + DBG ("%s: Err_Hook called on interface %s\n", p->name, sk->iface->name); } void -sk_send_to_agt(sock *sk, u16 len, struct ospf_iface *ifa, u8 state) +sk_send_to_agt (sock * sk, u16 len, struct ospf_iface *ifa, u8 state) { struct ospf_neighbor *n; - WALK_LIST(NODE n,ifa->neigh_list) - if(n->state>=state) - sk_send_to(sk, len, n->ip, OSPF_PROTO); -} + WALK_LIST (NODE n, ifa->neigh_list) if (n->state >= state) + sk_send_to (sk, len, n->ip, OSPF_PROTO); +} void -sk_send_to_bdr(sock *sk, u16 len, struct ospf_iface *ifa) +sk_send_to_bdr (sock * sk, u16 len, struct ospf_iface *ifa) { struct ospf_neighbor *n; - if(ipa_compare(ifa->drip,ipa_from_u32(0))!=0) - sk_send_to(sk, len, ifa->drip, OSPF_PROTO); - if(ipa_compare(ifa->bdrip,ipa_from_u32(0))!=0) - sk_send_to(sk, len, ifa->bdrip, OSPF_PROTO); + if (ipa_compare (ifa->drip, ipa_from_u32 (0)) != 0) + sk_send_to (sk, len, ifa->drip, OSPF_PROTO); + if (ipa_compare (ifa->bdrip, ipa_from_u32 (0)) != 0) + sk_send_to (sk, len, ifa->bdrip, OSPF_PROTO); } - |