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bird/proto/ospf/ospf.c
Ondrej Filip 96f1b8ba10 Huge changes. Neighbor and interface state machines rewritten. 
It should be cleaner now, I'm preparing for file splitting.
Maybe I added some minor bugs. :-(
1999-10-18 21:48:51 +00:00

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/*
* BIRD -- OSPF
*
* (c) 1999 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#define LOCAL_DEBUG
#include <string.h>
#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
rxmt_timer_hook(timer *timer)
{
struct ospf_iface *ifa;
struct proto *p;
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);
}
struct ospf_neighbor *
find_neigh(struct ospf_iface *ifa, u32 rid)
{
struct ospf_neighbor *n;
WALK_LIST (n, ifa->neigh_list)
if(n->rid == rid)
return n;
return NULL;
}
void
neigh_chstate(struct ospf_neighbor *n, u8 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;
}
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 ;
}
/* FIXME: Now, I should test MTU */
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:
/*
* RFC2328 says, that I sould start SM with 2-Way received.
* It's to complicated right now. So I'll rather ignore it and
* wait for a hello packet. FIXME
*/
return;
break;
case NEIGHBOR_EXSTART:
if(size!=sizeof(struct ospf_dbdes_packet))
{
debug("%s: Received bas dbdes from %u in exstart state.\n",
p->name, nrid);
return;
}
if(ps->imms==(DBDES_I|DBDES_M|DBDES_MS) && n->rid > myrid)
{
/* I'm slave! */
n->dds=ps->ddseq;
n->options=ps->options;
n->myimms=(n->myimms && DBDES_M);
debug("%s: I'm slave to %u. \n", p->name, nrid);
/* FIXME Negotiation done */
}
if(((ps->imms | DBDES_M)== DBDES_M) && (n->rid < myrid) &&
(n->dds == ps->ddseq))
{
/* I'm master! */
n->options=ps->options;
debug("%s: I'm master to %u. \n", p->name, nrid);
/* FIXME Negotiation done */
}
break;
case NEIGHBOR_EXCHANGE:
break;
case NEIGHBOR_LOADING:
case NEIGHBOR_FULL:
break;
}
n->ddr=ps->ddseq;
n->imms=ps->imms;
}
/* 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);
if(n->adj==0) /* First time adjacency */
{
n->dds=random_u32();
}
n->dds++;
n->myimms=(DBDES_MS | DBDES_M|DBDES_I );
tm_start(n->ifa->rxmt_timer,1); /* Or some other number ? */
}
/* 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
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);
}
int
can_do_adj(struct ospf_neighbor *n)
{
struct ospf_iface *ifa;
struct proto *p;
int i;
ifa=n->ifa;
p=(struct proto *)(ifa->proto);
i=0;
switch(ifa->type)
{
case OSPF_IT_PTP:
case OSPF_IT_VLINK:
i=1;
break;
case OSPF_IT_BCAST:
case OSPF_IT_NBMA:
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("%s: Neighbor? on iface %s\n",p->name, ifa->iface->name);
break;
case OSPF_IS_DROTHER:
if(((n->rid==ifa->drid) || (n->rid==ifa->bdrid))
&& (n->state==NEIGHBOR_2WAY)) i=1;
break;
case OSPF_IS_PTP:
case OSPF_IS_BACKUP:
case OSPF_IS_DR:
if(n->state==NEIGHBOR_2WAY) i=1;
break;
default:
die("%s: Iface %s in unknown state?",p->name, ifa->iface->name);
break;
}
break;
default:
die("%s: Iface %s is unknown type?",p->name, ifa->iface->name);
break;
}
DBG("%s: Iface %s can_do_adj=%d\n",p->name, ifa->iface->name,i);
return i;
}
void
ospf_neigh_sm(struct ospf_neighbor *n, int event)
/* Interface state machine */
{
struct proto *p;
p=(struct proto *)(n->ifa->proto);
switch(event)
{
case INM_START:
neigh_chstate(n,NEIGHBOR_ATTEMPT);
/* FIXME No NBMA now */
break;
case INM_HELLOREC:
switch(n->state)
{
case NEIGHBOR_ATTEMPT:
case NEIGHBOR_DOWN:
neigh_chstate(n,NEIGHBOR_INIT);
default:
restart_inactim(n);
break;
}
break;
case INM_2WAYREC:
if(n->state==NEIGHBOR_INIT)
{
/* Can In build adjacency? */
neigh_chstate(n,NEIGHBOR_2WAY);
if(can_do_adj(n))
{
neigh_chstate(n,NEIGHBOR_EXSTART);
tryadj(n,p);
}
}
break;
case INM_NEGDONE:
if(n->state==NEIGHBOR_EXSTART)
{
neigh_chstate(n,NEIGHBOR_EXCHANGE);
/* FIXME Go on... */
}
break;
case INM_EXDONE:
break;
case INM_LOADDONE:
break;
case INM_ADJOK:
switch(n->state)
{
case NEIGHBOR_2WAY:
/* Can In build adjacency? */
if(can_do_adj(n))
{
neigh_chstate(n,NEIGHBOR_EXSTART);
tryadj(n,p);
}
break;
default:
if(n->state>=NEIGHBOR_EXSTART)
if(!can_do_adj(n))
{
neigh_chstate(n,NEIGHBOR_2WAY);
/* FIXME Stop timers, kill database... */
}
break;
}
break;
case INM_SEQMIS:
case INM_BADLSREQ:
if(n->state>=NEIGHBOR_EXCHANGE)
{
neigh_chstate(n,NEIGHBOR_EXSTART);
/* Go on....*/
}
break;
case INM_KILLNBR:
case INM_LLDOWN:
case INM_INACTTIM:
neigh_chstate(n,NEIGHBOR_DOWN);
break;
case INM_1WAYREC:
if(n->state>=NEIGHBOR_2WAY)
{
neigh_chstate(n,NEIGHBOR_DOWN);
}
break;
default:
die("%s: INM - Unknown event?",p->name);
break;
}
}
void
bdr_election(struct ospf_iface *ifa, struct proto *p)
{
struct ospf_neighbor *neigh,*ndr,*nbdr,me;
u32 myid, ndrid, nbdrid;
int doadj;
p=(struct proto *)(ifa->proto);
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;
if(ndr==NULL) ndrid=0;
else ndrid=ndr->rid;
if(nbdr==NULL) nbdrid=0;
else nbdrid=nbdr->rid;
doadj=0;
if((ifa->drid!=ndrid) || (ifa->bdrid!=nbdrid)) doadj=1;
ifa->drid=ndrid;
ifa->bdrid=nbdrid;
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);
if(doadj)
{
WALK_LIST (neigh, ifa->neigh_list)
{
ospf_neigh_sm(neigh, INM_ADJOK);
}
}
}
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;
}
}
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;
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->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);
DBG("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);
DBG("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);
}
int
ospf_rx_hook(sock *sk, int size)
{
#ifndef IPV6
struct ospf_packet *ps;
struct ospf_iface *ifa;
struct proto *p;
u8 i;
u8 *pu8;
ifa=(struct ospf_iface *)(sk->data);
p=(struct proto *)(ifa->proto);
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)
{
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;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]);
debug("%s: received size: %u\n",p->name,size);
switch(ps->type)
{
case HELLO:
DBG("%s: Hello received.\n", p->name);
ospf_hello_rx((struct ospf_hello_packet *)ps, p, ifa, size);
break;
case DBDES:
DBG("%s: Database description received.\n", p->name);
ospf_dbdes_rx((struct ospf_dbdes_packet *)ps, p, ifa, size);
break;
case LSREQ:
DBG("%s: Link state request received.\n", p->name);
break;
case LSUPD:
DBG("%s: Link state update received.\n", p->name);
break;
case LSACK:
DBG("%s: Link state ack received.\n", p->name);
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);
}
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
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;
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=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);
ospf_int_sm(ifa, ISM_WAITF);
}
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;
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((ifa->hello_sk=ospf_open_mc_socket(ifa))==NULL)
{
log("%s: Huh? could not open mc socket on interface %s?", p->name,
iface->name);
mb_free(ifa);
log("%s: Ignoring this interface\n", p->name);
return;
}
if((ifa->ip_sk=ospf_open_ip_socket(ifa))==NULL)
{
log("%s: Huh? could not open ip socket on interface %s?", p->name,
iface->name);
mb_free(ifa);
log("%s: Ignoring this interface\n", p->name);
return;
}
init_list(&(ifa->neigh_list));
}
/* FIXME: This should read config */
ifa->helloint=0;
ifa->waitint=0;
ospf_add_timers(ifa,p->pool);
add_tail(&((struct proto_ospf *)p)->iface_list, NODE ifa);
ospf_int_sm(ifa, ISM_UP);
}
if(flags & IF_CHANGE_DOWN)
{
if((ifa=find_iface((struct proto_ospf *)p, iface))!=NULL)
{
debug(" OSPF: killing interface %s.\n", iface->name);
ospf_int_sm(ifa, ISM_DOWN);
}
}
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("%s: Start\n",p->name);
p->if_notify=ospf_if_notify;
return PS_UP;
}
static void
ospf_dump(struct proto *p)
{
char areastr[20];
struct ospf_iface *ifa;
struct ospf_neighbor *n;
struct ospf_config *c = (void *) p->cf;
debug("%s: AreaID: %u\n", p->name, c->area );
WALK_LIST(ifa, ((struct proto_ospf *)p)->iface_list)
{
debug("%s: Interface: %s\n", p->name, ifa->iface->name);
debug("%s: state: %u\n", p->name, ifa->state);
debug("%s: DR: %u\n", p->name, ifa->drid);
debug("%s: BDR: %u\n", p->name, ifa->bdrid);
WALK_LIST(n, ifa->neigh_list)
{
debug("%s: neighbor %u in state %u\n", p->name, n->rid, n->state);
}
}
}
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,
};
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