Commit 4364b47e authored by Ondřej Filip's avatar Ondřej Filip

ospf.c and ospc.h splitted into various files.

parent bff1db76
source=ospf.c topology.c
source=ospf.c topology.c packet.c hello.c neighbor.c iface.c dbdes.c
root-rel=../../
dir-name=proto/ospf
......
/*
* BIRD -- OSPF
*
* (c) 1999 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "ospf.h"
void
ospf_dbdes_tx(struct ospf_neighbor *n)
{
struct ospf_dbdes_packet *pkt;
struct ospf_packet *op;
struct ospf_iface *ifa;
u16 length;
struct proto *p;
ifa=n->ifa;
p=(struct proto *)(ifa->proto);
switch(n->state)
{
case NEIGHBOR_EXSTART: /* Send empty packets */
pkt=(struct ospf_dbdes_packet *)(ifa->ip_sk->tbuf);
op=(struct ospf_packet *)pkt;
fill_ospf_pkt_hdr(ifa, pkt, DBDES);
pkt->iface_mtu= ((struct iface *)ifa)->mtu;
pkt->options= ifa->options;
pkt->imms=n->myimms;
pkt->ddseq=n->dds;
length=sizeof(struct ospf_dbdes_packet);
op->length=htons(length);
ospf_pkt_finalize(ifa, op);
sk_send_to(ifa->ip_sk,length, n->ip, OSPF_PROTO);
debug("%s: DB_DES sent for %u.\n", p->name, n->rid);
/*case NEIGHBOR_EXCHANGE: */
default: /* Ignore it */
break;
}
}
void
rxmt_timer_hook(timer *timer)
{
struct ospf_iface *ifa;
struct proto *p;
struct ospf_neighbor *n;
ifa=(struct ospf_iface *)timer->data;
p=(struct proto *)(ifa->proto);
debug("%s: RXMT timer fired on interface %s.\n",
p->name, ifa->iface->name);
WALK_LIST (n, ifa->neigh_list) /* Try to send db_des */
{
ospf_dbdes_tx(n);
}
}
void
ospf_dbdes_rx(struct ospf_dbdes_packet *ps, struct proto *p,
struct ospf_iface *ifa, u16 size)
{
u32 nrid, myrid;
struct ospf_neighbor *n;
u8 i;
nrid=ntohl(((struct ospf_packet *)ps)->routerid);
myrid=p->cf->global->router_id;
if((n=find_neigh(ifa, nrid))==NULL)
{
debug("%s: Received dbdes from unknown neigbor! (%u)\n", p->name,
nrid);
return ;
}
if(ifa->iface->mtu<size)
{
debug("%s: Received dbdes larger than MTU from (%u)!\n", p->name, nrid);
return ;
}
switch(n->state)
{
case NEIGHBOR_DOWN:
case NEIGHBOR_ATTEMPT:
case NEIGHBOR_2WAY:
debug("%s: Received dbdes from %u in bad state. (%u)\n", p->name, nrid);
return;
break;
case NEIGHBOR_INIT:
ospf_neigh_sm(n, INM_2WAYREC);
if(n->state!=NEIGHBOR_EXSTART) return;
case NEIGHBOR_EXSTART:
if(ps->imms==(DBDES_I|DBDES_M|DBDES_MS) && (n->rid > myrid) &&
(size == sizeof(struct ospf_dbdes_packet)))
{
/* I'm slave! */
n->dds=ps->ddseq;
n->options=ps->options;
n->myimms=(n->myimms && DBDES_M);
n->ddr=ps->ddseq;
n->imms=ps->imms;
debug("%s: I'm slave to %u. \n", p->name, nrid);
ospf_neigh_sm(n, INM_NEGDONE);
}
else
{
if(((ps->imms & (DBDES_I|DBDES_MS))== 0) && (n->rid < myrid) &&
(n->dds == ps->ddseq))
{
/* I'm master! */
n->options=ps->options;
n->ddr=ps->ddseq;
n->imms=ps->imms;
debug("%s: I'm master to %u. \n", p->name, nrid);
ospf_neigh_sm(n, INM_NEGDONE);
}
else
{
debug("%s: Nothing happend to %u (imms=%u)", p->name, nrid,
ps->imms);
break;
}
}
break; /* I should probably continue processing packet */
case NEIGHBOR_EXCHANGE:
if((ps->imms==n->imms) && (ps->options=n->options) &&
(ps->ddseq==n->dds))
{
/* Duplicate packet */
debug("%s: Received duplicate dbdes from (%u)!\n", p->name, nrid);
if(!IAMMASTER(n->imms))
{
ospf_dbdes_tx(n);
}
return;
}
if(IAMMASTER(ps->imms)!=IAMMASTER(n->myimms)) /* M/S bit differs */
{
ospf_neigh_sm(n, INM_SEQMIS);
break;
}
if(INISET(ps->imms)) /* I bit is set */
{
ospf_neigh_sm(n, INM_SEQMIS);
break;
}
if(ps->options!=n->options) /* Options differs */
{
ospf_neigh_sm(n, INM_SEQMIS);
break;
}
if(IAMMASTER(n->myimms))
{
if(ps->ddseq!=n->dds)
{
ospf_neigh_sm(n, INM_SEQMIS);
break;
}
}
else
{
if(ps->ddseq!=(n->dds+1))
{
ospf_neigh_sm(n, INM_SEQMIS);
break;
}
}
/* FIXME: Packet accepted, go on */
break;
case NEIGHBOR_LOADING:
case NEIGHBOR_FULL:
if((ps->imms==n->imms) && (ps->options=n->options) &&
(ps->ddseq==n->dds)) /* Only duplicate are accepted */
{
debug("%s: Received duplicate dbdes from (%u)!\n", p->name, nrid);
return;
}
else
{
ospf_neigh_sm(n, INM_SEQMIS);
}
break;
defaut:
die("%s: Received dbdes from %u in unknown state. (%u)\n", p->name, nrid);
break;
}
}
/*
* BIRD -- OSPF
*
* (c) 1999 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*
*/
#ifndef _BIRD_OSPF_DBDES_H_
#define _BIRD_OSPF_DBDES_H_
void ospf_dbdes_tx(struct ospf_neighbor *n);
void rxmt_timer_hook(timer *timer);
void ospf_dbdes_rx(struct ospf_dbdes_packet *ps, struct proto *p,
struct ospf_iface *ifa, u16 size);
#endif /* _BIRD_OSPF_DBDES_H_ */
/*
* BIRD -- OSPF
*
* (c) 1999 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "ospf.h"
void
install_inactim(struct ospf_neighbor *n)
{
struct proto *p;
struct ospf_iface *ifa;
ifa=n->ifa;
p=(struct proto *)(ifa->proto);
if(n->inactim==NULL)
{
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);
}
}
void
restart_inactim(struct ospf_neighbor *n)
{
tm_start(n->inactim,n->ifa->deadc*n->ifa->helloint);
}
void
restart_hellotim(struct ospf_iface *ifa)
{
tm_start(ifa->hello_timer,ifa->helloint);
}
void
restart_waittim(struct ospf_iface *ifa)
{
tm_start(ifa->wait_timer,ifa->waitint);
}
void
ospf_hello_rx(struct ospf_hello_packet *ps, struct proto *p,
struct ospf_iface *ifa, int size, ip_addr faddr)
{
char sip[100]; /* FIXME: Should be smaller */
u32 nrid, *pnrid;
struct ospf_neighbor *neigh,*n;
u8 i,twoway;
nrid=ntohl(((struct ospf_packet *)ps)->routerid);
if((unsigned)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;
}
if((n=find_neigh(ifa, nrid))==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->rid=nrid;
n->ip=faddr;
n->dr=ntohl(ps->dr);
n->bdr=ntohl(ps->bdr);
n->priority=ps->priority;
n->options=ps->options;
n->ifa=ifa;
n->adj=0;
neigh_chstate(n,NEIGHBOR_DOWN);
install_inactim(n);
}
ospf_neigh_sm(n, INM_HELLOREC);
pnrid=(u32 *)((struct ospf_hello_packet *)(ps+1));
twoway=0;
for(i=0;i<size-(sizeof(struct ospf_hello_packet));i++)
{
if(ntohl(*(pnrid+i))==p->cf->global->router_id)
{
DBG("%s: Twoway received. %u\n", p->name, nrid);
ospf_neigh_sm(n, INM_2WAYREC);
twoway=1;
break;
}
}
if(!twoway) ospf_neigh_sm(n, INM_1WAYREC);
/* Check priority change */
if(n->priority!=(n->priority=ps->priority))
{
ospf_int_sm(ifa, ISM_NEICH);
}
/* Check neighbor's designed router idea */
if((n->rid!=ntohl(ps->dr)) && (ntohl(ps->bdr)==0) &&
(n->state>=NEIGHBOR_2WAY))
{
ospf_int_sm(ifa, ISM_BACKS);
}
if((n->rid==ntohl(ps->dr)) && (n->dr!=ntohl(ps->dr)))
{
ospf_int_sm(ifa, ISM_NEICH);
}
if((n->rid==n->dr) && (n->dr!=ntohl(ps->dr)))
{
ospf_int_sm(ifa, ISM_NEICH);
}
n->dr=ntohl(ps->dr); /* And update it */
/* Check neighbor's backup designed router idea */
if((n->rid==ntohl(ps->bdr)) && (n->state>=NEIGHBOR_2WAY))
{
ospf_int_sm(ifa, ISM_BACKS);
}
if((n->rid==ntohl(ps->bdr)) && (n->bdr!=ntohl(ps->bdr)))
{
ospf_int_sm(ifa, ISM_NEICH);
}
if((n->rid==n->bdr) && (n->bdr!=ntohl(ps->bdr)))
{
ospf_int_sm(ifa, ISM_NEICH);
}
n->bdr=ntohl(ps->bdr); /* And update it */
ospf_neigh_sm(n, INM_HELLOREC);
}
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;
u8 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 *)(((u8 *)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=htons(length);
ospf_pkt_finalize(ifa, op);
/* 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);
ospf_int_sm(ifa, ISM_WAITF);
}
/* 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);
/* FIXME: Go on */
}
/*
* BIRD -- OSPF
*
* (c) 1999 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*
*/
#ifndef _BIRD_OSPF_HELLO_H_
#define _BIRD_OSPF_HELLO_H_
void install_inactim(struct ospf_neighbor *n);
void restart_inactim(struct ospf_neighbor *n);
void restart_hellotim(struct ospf_iface *ifa);
void restart_waittim(struct ospf_iface *ifa);
void ospf_hello_rx(struct ospf_hello_packet *ps, struct proto *p,
struct ospf_iface *ifa, int size, ip_addr faddr);
void hello_timer_hook(timer *timer);
void wait_timer_hook(timer *timer);
void neighbor_timer_hook(timer *timer);
#endif /* _BIRD_OSPF_HELLO_H_ */
/*
* BIRD -- OSPF
*
* (c) 1999 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "ospf.h"
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;
}
void
downint(struct ospf_iface *ifa)
{
/* FIXME: Delete all neighbors! */
}
void
ospf_int_sm(struct ospf_iface *ifa, int event)
{
struct proto *p;
p=(struct proto *)(ifa->proto);
DBG("%s: SM on iface %s. Event is %d.\n",
p->name, ifa->iface->name, event);
switch(event)
{
case ISM_UP:
if(ifa->state==OSPF_IS_DOWN)
{
restart_hellotim(ifa);
if((ifa->type==OSPF_IT_PTP) || (ifa->type==OSPF_IT_VLINK))
{
iface_chstate(ifa, OSPF_IS_PTP);
}
else
{
if(ifa->priority==0)
{
iface_chstate(ifa, OSPF_IS_DROTHER);
}
else
{
iface_chstate(ifa, OSPF_IS_WAITING);
restart_waittim(ifa);
}
}
}
break;
case ISM_BACKS:
case ISM_WAITF:
if(ifa->state==OSPF_IS_WAITING)
{
bdr_election(ifa ,p);
}
break;
case ISM_NEICH:
if((ifa->state==OSPF_IS_DROTHER) || (ifa->state==OSPF_IS_DR) ||
(ifa->state==OSPF_IS_BACKUP))
{
bdr_election(ifa ,p);
}
case ISM_DOWN:
iface_chstate(ifa, OSPF_IS_DOWN);
downint(ifa);
break;
case ISM_LOOP: /* Useless? */
iface_chstate(ifa, OSPF_IS_LOOP);
downint(ifa);
break;
case ISM_UNLOOP:
iface_chstate(ifa, OSPF_IS_DOWN);
break;
default:
die("%s: ISM - Unknown event?",p->name);
break;
}
}
sock *
ospf_open_mc_socket(struct ospf_iface *ifa)
{
sock *mcsk;
struct proto *p;
p=(struct proto *)(ifa->proto);
/* 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("%s: SK_OPEN: mc open failed.\n",p->name);
return(NULL);
}
DBG("%s: SK_OPEN: mc opened.\n",p->name);
return(mcsk);
}
else return(NULL);
}
sock *
ospf_open_ip_socket(struct ospf_iface *ifa)
{
sock *ipsk;
struct proto *p;
p=(struct proto *)(ifa->proto);
ipsk=sk_new(p->pool);
ipsk->type=SK_IP;
ipsk->dport=OSPF_PROTO;
ipsk->saddr=ifa->iface->addr->ip;
ipsk->tos=IP_PREC_INTERNET_CONTROL;
ipsk->ttl=1;
ipsk->rx_hook=ospf_rx_hook;
ipsk->tx_hook=ospf_tx_hook;
ipsk->err_hook=ospf_err_hook;
ipsk->iface=ifa->iface;
ipsk->rbsize=ifa->iface->mtu;
ipsk->tbsize=ifa->iface->mtu;
ipsk->data=(void *)ifa;
if(sk_open(ipsk)!=0)
{
DBG("%s: SK_OPEN: ip open failed.\n",p->name);
return(NULL);
}
DBG("%s: SK_OPEN: ip opened.\n",p->name);
return(ipsk);
}
/*
* This will later decide, wheter use iface for OSPF or not
* depending on config
*/
u8
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 */
u8
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 BCAST.\n");
return OSPF_IT_BCAST;
}
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
ospf_add_timers(struct ospf_iface *ifa, pool *pool)
{
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;
DBG("%s: Installing hello timer. (%u)\n", p->name, ifa->helloint);
ifa->rxmt_timer=tm_new(pool);
ifa->rxmt_timer->data=ifa;
ifa->rxmt_timer->randomize=0;
if(ifa->rxmtint==0) ifa->rxmtint=RXMTINT_D;
ifa->rxmt_timer->hook=rxmt_timer_hook;
ifa->rxmt_timer->recurrent=ifa->rxmtint;
DBG("%s: Installing rxmt timer. (%u)\n", p->name, ifa->rxmtint);
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;
if(ifa->waitint==0) ifa->waitint= WAIT_DMH*ifa->helloint;
DBG("%s: Installing wait timer. (%u)\n", p->name, ifa->waitint);
}
void
ospf_iface_default(struct ospf_iface *ifa)
{
u8 i;