/* * BIRD -- OSPF * * (c) 1999 Ondrej Filip * * Can be freely distributed and used under the terms of the GNU GPL. */ #define LOCAL_DEBUG #include #include "nest/bird.h" #include "nest/iface.h" #include "nest/protocol.h" #include "nest/route.h" #include "conf/conf.h" #include "lib/ip.h" #include "lib/socket.h" #include "lib/lists.h" #include "lib/timer.h" #include "lib/checksum.h" #include "ospf.h" void neigh_chstate(struct ospf_neighbor *n, int state) { struct ospf_iface *ifa; struct proto *p; ifa=n->ifa; p=(struct proto *)(ifa->proto); debug("%s: Neigbor '%u' changes state from %u to %u.\n", p->name, n->rid, n->state, state); n->state=state; } /* Try to build neighbor adjacency (if does not exists) */ void tryadj(struct ospf_neighbor *n, struct proto *p) { DBG("%s: Going to build adjacency.\n", p->name); neigh_chstate(n,NEIGHBOR_EXSTART); /* FIXME Go on */ } /* Neighbor is inactive for a long time. Remove it. */ void neighbor_timer_hook(timer *timer) { struct ospf_neighbor *n; struct ospf_iface *ifa; struct proto *p; n=(struct ospf_neighbor *)timer->data; ifa=n->ifa; p=(struct proto *)(ifa->proto); debug("%s: Inactivity timer fired on interface %s for neighbor %u.\n", p->name, ifa->iface->name, n->rid); tm_stop(n->inactim); rfree(n->inactim); rem_node(NODE n); mb_free(n); debug("%s: Deleting neigbor.\n", p->name); } void iface_chstate(struct ospf_iface *ifa, u8 state) { struct proto *p; p=(struct proto *)(ifa->proto); debug("%s: Changing state of iface: %s from %u into %u.\n", p->name, ifa->iface->name, ifa->state, state); ifa->state=state; } struct ospf_neighbor * electbdr(list nl) { struct ospf_neighbor *neigh,*n1,*n2; n1=NULL; n2=NULL; WALK_LIST (neigh, nl) /* First try those decl. themselves */ { if(neigh->state>=NEIGHBOR_2WAY) /* Higher than 2WAY */ if(neigh->priority>0) /* Eligible */ if(neigh->rid!=neigh->dr) /* And not declaring itself DR */ { if(neigh->rid==neigh->bdr) /* Declaring BDR */ { if(n1!=NULL) { if(neigh->priority>n1->priority) n1=neigh; else if(neigh->priority==n1->priority) if(neigh->rid>n1->rid) n1=neigh; } else { n1=neigh; } } else /* And NOT declaring BDR */ { if(n2!=NULL) { if(neigh->priority>n2->priority) n2=neigh; else if(neigh->priority==n2->priority) if(neigh->rid>n2->rid) n2=neigh; } else { n2=neigh; } } } } if(n1==NULL) n1=n2; return(n1); } struct ospf_neighbor * electdr(list nl) { struct ospf_neighbor *neigh,*n; n=NULL; WALK_LIST (neigh, nl) /* And now DR */ { if(neigh->state>=NEIGHBOR_2WAY) /* Higher than 2WAY */ if(neigh->priority>0) /* Eligible */ if(neigh->rid==neigh->dr) /* And declaring itself DR */ { if(n!=NULL) { if(neigh->priority>n->priority) n=neigh; else if(neigh->priority==n->priority) if(neigh->rid>n->rid) n=neigh; } else { n=neigh; } } } return(n); } void backupseen(struct ospf_iface *ifa) { struct proto *p; struct ospf_neighbor *neigh,*ndr,*nbdr,me; u32 myid; p=(struct proto *)(ifa->proto); tm_stop(ifa->wait_timer); DBG("%s: Stoping wait timer\n",p->name); DBG("%s: (B)DR election.\n",p->name); myid=p->cf->global->router_id; me.state=NEIGHBOR_2WAY; me.rid=myid; me.priority=ifa->priority; me.dr=ifa->drid; me.bdr=ifa->bdrid; add_tail(&ifa->neigh_list, NODE &me); nbdr=electbdr(ifa->neigh_list); ndr=electdr(ifa->neigh_list); if(ndr==NULL) ndr=nbdr; if(((ifa->drid==myid) && (ndr->rid!=myid)) || ((ifa->drid!=myid) && (ndr->rid==myid)) || ((ifa->bdrid==myid) && (nbdr->rid!=myid)) || ((ifa->bdrid!=myid) && (nbdr->rid==myid))) { if(ndr==NULL) ifa->drid=me.dr=0; else ifa->drid=me.dr=ndr->rid; if(nbdr==NULL) ifa->bdrid=me.bdr=0; else ifa->bdrid=me.bdr=nbdr->rid; nbdr=electbdr(ifa->neigh_list); ndr=electdr(ifa->neigh_list); } if(ndr==NULL) ifa->drid=0; else ifa->drid=ndr->rid; if(nbdr==NULL) ifa->bdrid=0; else ifa->bdrid=me.bdr=nbdr->rid; DBG("%s: DR=%u, BDR=%u\n",p->name, ifa->drid, ifa->bdrid); if(myid==ifa->drid) iface_chstate(ifa, OSPF_IS_DR); else { if(myid==ifa->bdrid) iface_chstate(ifa, OSPF_IS_BACKUP); else iface_chstate(ifa, OSPF_IS_DROTHER); } rem_node(NODE &me); } void ospf_hello_rx(struct ospf_hello_packet *ps, struct proto *p, struct ospf_iface *ifa, int size) { char sip[100]; /* FIXME: Should be smaller */ u32 nrid, *pnrid; struct ospf_neighbor *neigh,*n; int i,twoway; nrid=ntohl(((struct ospf_packet *)ps)->routerid); if(ipa_mklen(ipa_ntoh(ps->netmask))!=ifa->iface->addr->pxlen) { ip_ntop(ps->netmask,sip); log("%s: Bad OSPF packet from %u received: bad netmask %s.", p->name, nrid, sip); log("%s: Discarding",p->name); return; } if(ntohs(ps->helloint)!=ifa->helloint) { log("%s: Bad OSPF packet from %u received: hello interval mismatch.", p->name, nrid); log("%s: Discarding",p->name); return; } if(ntohl(ps->deadint)!=ifa->helloint*ifa->deadc) { log("%s: Bad OSPF packet from %u received: dead interval mismatch.", p->name, nrid); log("%s: Discarding",p->name); return; } if(ps->options!=ifa->options) { log("%s: Bad OSPF packet from %u received: options mismatch.", p->name, nrid); /* FIXME: This not good */ log("%s: Discarding",p->name); return; } n=NULL; WALK_LIST (neigh, ifa->neigh_list) { if(neigh->rid==nrid) { n=neigh; break; } } if(n==NULL) { log("%s: New neighbor found: %u.", p->name,nrid); n=mb_alloc(p->pool, sizeof(struct ospf_neighbor)); add_tail(&ifa->neigh_list, NODE n); n->inactim=tm_new(p->pool); n->inactim->data=n; n->inactim->randomize=0; n->inactim->hook=neighbor_timer_hook; n->inactim->recurrent=0; DBG("%s: Installing inactivity timer.\n", p->name); n->rid=nrid; n->dr=ntohl(ps->dr); n->bdr=ntohl(ps->bdr); n->priority=ps->priority; n->options=ps->options; n->ifa=ifa; neigh_chstate(n,NEIGHBOR_INIT); } tm_start(n->inactim,ifa->deadc*ifa->helloint); twoway=0; pnrid=(u32 *)((struct ospf_hello_packet *)(ps+1)); for(i=0;icf->global->router_id) { twoway=1; DBG("%s: Twoway received. %u\n", p->name, nrid); break; } } if(twoway) { if(n->statestate>=NEIGHBOR_2WAY) { /* FIXME Delete all learnt */ neigh_chstate(n,NEIGHBOR_INIT); } } /* Check priority change */ if(n->priority!=(n->priority=ps->priority)) { /* FIXME NeighborChange */; } /* Check neighbor's designed router idea */ if((n->rid!=ntohl(ps->dr)) && (ntohl(ps->bdr)==0) && (ifa->state==OSPF_IS_WAITING) && (n->state>=NEIGHBOR_2WAY)) { backupseen(ifa); } if((n->rid==ntohl(ps->dr)) && (n->dr!=ntohl(ps->dr))) { /* FIXME NeighborChange */; } if((n->rid==n->dr) && (n->dr!=ntohl(ps->dr))) { /* FIXME NeighborChange */; } n->dr=ntohl(ps->dr); /* And update it */ /* Check neighbor's backup designed router idea */ if((n->rid==ntohl(ps->bdr)) && (ifa->state==OSPF_IS_WAITING) && (n->state>=NEIGHBOR_2WAY)) { backupseen(ifa); } if((n->rid==ntohl(ps->bdr)) && (n->bdr!=ntohl(ps->bdr))) { /* FIXME NeighborChange */; } if((n->rid==n->bdr) && (n->bdr!=ntohl(ps->bdr))) { /* FIXME NeighborChange */; } n->bdr=ntohl(ps->bdr); /* And update it */ switch(ifa->state) { case OSPF_IS_DOWN: die("%s: Iface %s in down state?", p->name, ifa->iface->name); break; case OSPF_IS_WAITING: DBG(p->name); DBG(": Neighbor? on iface "); DBG(ifa->iface->name); DBG("\n"); break; case OSPF_IS_DROTHER: if(((n->rid==ifa->drid) || (n->rid==ifa->bdrid)) && (n->state==NEIGHBOR_2WAY)) tryadj(n,p); break; case OSPF_IS_PTP: case OSPF_IS_BACKUP: case OSPF_IS_DR: if(n->state==NEIGHBOR_2WAY) tryadj(n,p); break; default: die("%s: Iface %s in unknown state?",p->name, ifa->iface->name); break; } } int ospf_rx_hook(sock *sk, int size) { #ifndef IPV6 struct ospf_packet *ps; struct ospf_iface *ifa; struct proto *p; int i; u8 *pu8; ifa=(struct ospf_iface *)(sk->data); p=(struct proto *)(ifa->proto); DBG(p->name); DBG(": RX_Hook called on interface "); DBG(sk->iface->name); DBG(".\n"); 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(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) { 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); } /* FIXME: Do authetification */ if(ps->areaid!=ifa->area) { 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 IP!.", 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;ilength);i+=4) debug("%s: received %u,%u,%u,%u\n",p->name, pu8[i+0], pu8[i+1], pu8[i+2], pu8[i+3]); debug("%s: received size: %u\n",p->name,size); switch(ps->type) { case HELLO: DBG(p->name); DBG(": Hello received.\n"); ospf_hello_rx((struct ospf_hello_packet *)ps, p, ifa, size); break; case DBDES: break; case LSREQ: break; case LSUPD: break; case LSACK: break; default: log("%s: Bad packet received: wrong type %u", p->name, ps->type); log("%s: Discarding",p->name); return(1); }; DBG("\n"); #else #error RX_Hook does not work for IPv6 now. #endif return(1); } void ospf_tx_hook(sock *sk) { struct ospf_iface *ifa; struct proto *p; 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); } void ospf_err_hook(sock *sk, int err) { struct ospf_iface *ifa; struct proto *p; 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); } /* This will change ! */ sock * ospf_open_socket(struct proto *p, struct ospf_iface *ifa) { sock *mcsk; /* FIXME: No NBMA networks now */ if(ifa->iface->flags & IF_MULTICAST) { mcsk=sk_new(p->pool); mcsk->type=SK_IP_MC; mcsk->dport=OSPF_PROTO; mcsk->saddr=AllSPFRouters; mcsk->daddr=AllSPFRouters; mcsk->tos=IP_PREC_INTERNET_CONTROL; mcsk->ttl=1; mcsk->rx_hook=ospf_rx_hook; mcsk->tx_hook=ospf_tx_hook; mcsk->err_hook=ospf_err_hook; mcsk->iface=ifa->iface; mcsk->rbsize=ifa->iface->mtu; mcsk->tbsize=ifa->iface->mtu; mcsk->data=(void *)ifa; if(sk_open(mcsk)!=0) { DBG(p->name); DBG(": SK_OPEN: failed\n"); return(NULL); } DBG(p->name); DBG(": SK_OPEN: open\n"); return(mcsk); } else return(NULL); } /* * This will later decide, wheter use iface for OSPF or not * depending on config */ int is_good_iface(struct proto *p, struct iface *iface) { if(iface->flags & IF_UP) { if(!(iface->flags & IF_IGNORE)) return 1; } return 0; } /* Of course, it's NOT true now */ int ospf_iface_clasify(struct iface *ifa) { /* FIXME: Latter I'll use config - this is incorrect */ if((ifa->flags & (IF_MULTIACCESS|IF_MULTICAST))== (IF_MULTIACCESS|IF_MULTICAST)) { DBG(" OSPF: Clasifying BROADCAST.\n"); return OSPF_IT_BROADCAST; } if((ifa->flags & (IF_MULTIACCESS|IF_MULTICAST))== IF_MULTIACCESS) { DBG(" OSPF: Clasifying NBMA.\n"); return OSPF_IT_NBMA; } DBG(" OSPF: Clasifying P-T-P.\n"); return OSPF_IT_PTP; } void 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; pkt->version=OSPF_VERSION; pkt->type=h_type; pkt->routerid=htonl(p->cf->global->router_id); pkt->areaid=htonl(ifa->area); pkt->autype=htons(ifa->autype); pkt->checksum=0; } void hello_timer_hook(timer *timer) { struct ospf_iface *ifa; struct ospf_hello_packet *pkt; struct ospf_packet *op; struct proto *p; struct ospf_neighbor *neigh; u16 length; u32 *pp; int i; ifa=(struct ospf_iface *)timer->data; p=(struct proto *)(ifa->proto); debug("%s: Hello timer fired on interface %s.\n", p->name, ifa->iface->name); /* Now we should send a hello packet */ /* First a common packet header */ if(ifa->type!=OSPF_IT_NBMA) { /* Now fill ospf_hello header */ pkt=(struct ospf_hello_packet *)(ifa->hello_sk->tbuf); op=(struct ospf_packet *)pkt; fill_ospf_pkt_hdr(ifa, pkt, HELLO); pkt->netmask=ipa_mkmask(ifa->iface->addr->pxlen); ipa_hton(pkt->netmask); pkt->helloint=ntohs(ifa->helloint); pkt->options=ifa->options; pkt->priority=ifa->priority; pkt->deadint=htonl(ifa->deadc*ifa->helloint); pkt->dr=htonl(ifa->drid); pkt->bdr=htonl(ifa->bdrid); /* Fill all neighbors */ i=0; pp=(u32 *)(((byte *)pkt)+sizeof(struct ospf_hello_packet)); WALK_LIST (neigh, ifa->neigh_list) { *(pp+i)=htonl(neigh->rid); i++; } length=sizeof(struct ospf_hello_packet)+i*sizeof(u32); op->length=ntohs(length); /* FIXME Do authentification */ /* Count checksum */ op->checksum=ipsum_calculate(op,sizeof(struct ospf_packet)-8, &(pkt->netmask),length-sizeof(struct ospf_packet),NULL); /* And finally send it :-) */ sk_send(ifa->hello_sk,length); } } void wait_timer_hook(timer *timer) { struct ospf_iface *ifa; struct proto *p; ifa=(struct ospf_iface *)timer->data; p=(struct proto *)(ifa->proto); debug("%s: Wait timer fired on interface %s.\n", p->name, ifa->iface->name); if(ifa->state=OSPF_IS_WAITING) backupseen(ifa); else die("%s: Wait timer fired I'm not in WAITING state?", p->name); } void ospf_add_timers(struct ospf_iface *ifa, pool *pool, int wait) { struct proto *p; p=(struct proto *)(ifa->proto); /* Add hello timer */ ifa->hello_timer=tm_new(pool); ifa->hello_timer->data=ifa; ifa->hello_timer->randomize=0; if(ifa->helloint==0) ifa->helloint=HELLOINT_D; ifa->hello_timer->hook=hello_timer_hook; ifa->hello_timer->recurrent=ifa->helloint; tm_start(ifa->hello_timer,ifa->helloint); DBG("%s: Installing hello timer. (%u)\n", p->name, ifa->helloint); if((ifa->type!=OSPF_IT_PTP)) { /* Install wait timer on NOT-PtP interfaces */ ifa->wait_timer=tm_new(pool); ifa->wait_timer->data=ifa; ifa->wait_timer->randomize=0; ifa->wait_timer->hook=wait_timer_hook; ifa->wait_timer->recurrent=0; ifa->state=OSPF_IS_WAITING; tm_start(ifa->wait_timer,(wait!=0 ? wait : WAIT_DMH*ifa->helloint)); DBG("%s: Installing wait timer. (%u)\n", p->name, (wait!=0 ? wait : WAIT_DMH*ifa->helloint)); } else ifa->state=OSPF_IS_PTP; } void ospf_iface_default(struct ospf_iface *ifa) { int i; ifa->area=0; /* FIXME: Read from config */ ifa->cost=COST_D; ifa->rxmtint=RXMTINT_D; ifa->iftransdelay=IFTRANSDELAY_D; ifa->priority=PRIORITY_D; ifa->helloint=HELLOINT_D; ifa->deadc=DEADC_D; ifa->autype=0; for(i=0;i<8;i++) ifa->aukey[i]=0; ifa->options=2; ifa->drip=ipa_from_u32(0x00000000); ifa->drid=0; ifa->bdrip=ipa_from_u32(0x00000000); ifa->bdrid=0; ifa->type=ospf_iface_clasify(ifa->iface); } struct ospf_iface* find_iface(struct proto_ospf *p, struct iface *what) { struct ospf_iface *i; WALK_LIST (i, p->iface_list) if ((i)->iface == what) return i; return NULL; } void ospf_if_notify(struct proto *p, unsigned flags, struct iface *iface) { struct ospf_iface *ifa; sock *mcsk; struct ospf_config *c; c=(struct ospf_config *)(p->cf); DBG(" OSPF: If notify called\n"); if (iface->flags & IF_IGNORE) return; if((flags & IF_CHANGE_UP) && is_good_iface(p, iface)) { debug(" OSPF: using interface %s.\n", iface->name); /* FIXME: Latter I'll use config - this is incorrect */ ifa=mb_alloc(p->pool, sizeof(struct ospf_iface)); ifa->proto=(struct proto_ospf *)p; ifa->iface=iface; ospf_iface_default(ifa); if(ifa->type!=OSPF_IT_NBMA) { if((mcsk=ospf_open_socket(p, ifa))!=NULL) { ifa->hello_sk=mcsk; } else { log("%s: Huh? could not open socket on interface %s?", p->name, iface->name); mb_free(ifa); log("%s: Ignoring this interface\n", p->name); return; } /* FIXME: In fail case??? */ init_list(&(ifa->neigh_list)); } /* FIXME: NBMA? */ /* FIXME: This should read config */ ifa->helloint=0; ospf_add_timers(ifa,p->pool,0); add_tail(&((struct proto_ospf *)p)->iface_list, NODE ifa); } if(flags & IF_CHANGE_DOWN) { if((ifa=find_iface((struct proto_ospf *)p, iface))!=NULL) { debug(" OSPF: killing interface %s.\n", iface->name); /* FIXME: This should delete ifaces */ } } if(flags & IF_CHANGE_MTU) { if((ifa=find_iface((struct proto_ospf *)p, iface))!=NULL) { debug(" OSPF: changing MTU on interface %s.\n", iface->name); /* FIXME: change MTU */ } } } static int ospf_start(struct proto *p) { DBG(p->name); DBG(": Start\n"); p->if_notify=ospf_if_notify; return PS_UP; } static void ospf_dump(struct proto *p) { char areastr[20]; struct ospf_config *c = (void *) p->cf; DBG(p->name); DBG(": Dump.\n"); debug(" -AreaID: %u\n", c->area ); } static struct proto * ospf_init(struct proto_config *c) { struct proto *p = proto_new(c, sizeof(struct proto_ospf)); DBG(" OSPF: Init.\n"); p->neigh_notify = NULL; p->if_notify = NULL; init_list(&((struct proto_ospf *)p)->iface_list); return p; } static void ospf_preconfig(struct protocol *p, struct config *c) { DBG( " OSPF: preconfig\n" ); } static void ospf_postconfig(struct proto_config *c) { DBG( " OSPF: postconfig\n" ); } struct protocol proto_ospf = { name: "OSPF", init: ospf_init, dump: ospf_dump, start: ospf_start, preconfig: ospf_preconfig, postconfig: ospf_postconfig, };