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Huge changes. Neighbor and interface state machines rewritten.

Browse source 
It should be cleaner now, I'm preparing for file splitting.
Maybe I added some minor bugs. :-(
This commit is contained in:
Ondrej Filip 1999-10-18 21:48:51 +00:00
parent f942a589ef
commit 96f1b8ba10
2 changed files with 348 additions and 96 deletions
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387
proto/ospf/ospf.c
View file

@ -255,16 +255,195 @@ electdr(list nl)
}
void
backupseen(struct ospf_iface *ifa)
install_inactim(struct ospf_neighbor *n)
{
struct proto *p;
struct ospf_neighbor *neigh,*ndr,*nbdr,me;
u32 myid;
struct ospf_iface *ifa;
ifa=n->ifa;
p=(struct proto *)(ifa->proto);
tm_stop(ifa->wait_timer);
DBG("%s: Stoping wait timer\n",p->name);
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);
@ -297,11 +476,18 @@ backupseen(struct ospf_iface *ifa)
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;
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);
@ -313,6 +499,85 @@ backupseen(struct ospf_iface *ifa)
}
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
@ -364,12 +629,6 @@ ospf_hello_rx(struct ospf_hello_packet *ps, struct proto *p,
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);
@ -377,97 +636,69 @@ ospf_hello_rx(struct ospf_hello_packet *ps, struct proto *p,
n->options=ps->options;
n->ifa=ifa;
n->adj=0;
neigh_chstate(n,NEIGHBOR_INIT);
neigh_chstate(n,NEIGHBOR_DOWN);
install_inactim(n);
}
tm_start(n->inactim,ifa->deadc*ifa->helloint);
ospf_neigh_sm(n, INM_HELLOREC);
twoway=0;
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)
{
twoway=1;
DBG("%s: Twoway received. %u\n", p->name, nrid);
ospf_neigh_sm(n, INM_2WAYREC);
twoway=1;
break;
}
}
if(twoway)
{
if(n->state<NEIGHBOR_2WAY) neigh_chstate(n,NEIGHBOR_2WAY);
}
else
{
if(n->state>=NEIGHBOR_2WAY)
{
/* FIXME Delete all learnt */
neigh_chstate(n,NEIGHBOR_INIT);
}
}
if(!twoway) ospf_neigh_sm(n, INM_1WAYREC);
/* Check priority change */
if(n->priority!=(n->priority=ps->priority))
{
/* FIXME NeighborChange */;
ospf_int_sm(ifa, ISM_NEICH);
}
/* 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))
(n->state>=NEIGHBOR_2WAY))
{
backupseen(ifa);
ospf_int_sm(ifa, ISM_BACKS);
DBG("BACKS");
}
if((n->rid==ntohl(ps->dr)) && (n->dr!=ntohl(ps->dr)))
{
/* FIXME NeighborChange */;
ospf_int_sm(ifa, ISM_NEICH);
}
if((n->rid==n->dr) && (n->dr!=ntohl(ps->dr)))
{
/* FIXME NeighborChange */;
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)) && (ifa->state==OSPF_IS_WAITING)
&& (n->state>=NEIGHBOR_2WAY))
if((n->rid==ntohl(ps->bdr)) && (n->state>=NEIGHBOR_2WAY))
{
backupseen(ifa);
ospf_int_sm(ifa, ISM_BACKS);
DBG("BACKS");
}
if((n->rid==ntohl(ps->bdr)) && (n->bdr!=ntohl(ps->bdr)))
{
/* FIXME NeighborChange */;
ospf_int_sm(ifa, ISM_NEICH);
}
if((n->rid==n->bdr) && (n->bdr!=ntohl(ps->bdr)))
{
/* FIXME NeighborChange */;
ospf_int_sm(ifa, ISM_NEICH);
}
n->bdr=ntohl(ps->bdr); /* And update it */
ospf_neigh_sm(n, INM_HELLOREC);
}
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)) 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)
@ -697,8 +928,8 @@ ospf_iface_clasify(struct iface *ifa)
if((ifa->flags & (IF_MULTIACCESS|IF_MULTICAST))==
(IF_MULTIACCESS|IF_MULTICAST))
{
DBG(" OSPF: Clasifying BROADCAST.\n");
return OSPF_IT_BROADCAST;
DBG(" OSPF: Clasifying BCAST.\n");
return OSPF_IT_BCAST;
}
if((ifa->flags & (IF_MULTIACCESS|IF_MULTICAST))==
IF_MULTIACCESS)
@ -799,12 +1030,11 @@ wait_timer_hook(timer *timer)
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);
ospf_int_sm(ifa, ISM_WAITF);
}
void
ospf_add_timers(struct ospf_iface *ifa, pool *pool, u16 wait)
ospf_add_timers(struct ospf_iface *ifa, pool *pool)
{
struct proto *p;
@ -816,7 +1046,7 @@ ospf_add_timers(struct ospf_iface *ifa, pool *pool, u16 wait)
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);
ifa->rxmt_timer=tm_new(pool);
ifa->rxmt_timer->data=ifa;
@ -824,21 +1054,15 @@ ospf_add_timers(struct ospf_iface *ifa, pool *pool, u16 wait)
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);
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;
if(ifa->waitint==0) ifa->waitint= WAIT_DMH*ifa->helloint;
DBG("%s: Installing wait timer. (%u)\n", p->name, ifa->waitint);
}
void
@ -917,11 +1141,12 @@ ospf_if_notify(struct proto *p, unsigned flags, struct iface *iface)
init_list(&(ifa->neigh_list));
}
/* FIXME: NBMA? */
/* FIXME: This should read config */
ifa->helloint=0;
ospf_add_timers(ifa,p->pool,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)
@ -929,7 +1154,7 @@ ospf_if_notify(struct proto *p, unsigned flags, struct iface *iface)
if((ifa=find_iface((struct proto_ospf *)p, iface))!=NULL)
{
debug(" OSPF: killing interface %s.\n", iface->name);
/* FIXME: This should delete ifaces */
ospf_int_sm(ifa, ISM_DOWN);
}
}

45
proto/ospf/ospf.h
View file

@ -44,6 +44,7 @@ struct ospf_iface {
interface. LSAs contained in the update */
u8 priority; /* A router priority for DR election */
u16 helloint; /* number of seconds between hello sending */
u16 waitint; /* number of sec before changing state from wait */
u32 deadc; /* after "deadint" missing hellos is router dead */
u16 autype;
u8 aukey[8];
@ -53,16 +54,18 @@ struct ospf_iface {
ip_addr bdrip; /* Backup DR */
u32 bdrid;
u8 type; /* OSPF view of type */
#define OSPF_IT_BROADCAST 0
#define OSPF_IT_BCAST 0
#define OSPF_IT_NBMA 1
#define OSPF_IT_PTP 2
#define OSPF_IT_VLINK 3
u8 state; /* Interface state machine */
#define OSPF_IS_DOWN 0 /* Should never happen */
#define OSPF_IS_WAITING 1 /* Waiting for Wait timer */
#define OSPF_IS_PTP 2 /* PTP operational */
#define OSPF_IS_DROTHER 3 /* I'm on BCAST or NBMA and I'm not DR */
#define OSPF_IS_BACKUP 4 /* I'm BDR */
#define OSPF_IS_DR 5 /* I'm DR */
#define OSPF_IS_DOWN 0 /* Not working */
#define OSPF_IS_LOOP 1 /* Should never happen */
#define OSPF_IS_WAITING 2 /* Waiting for Wait timer */
#define OSPF_IS_PTP 3 /* PTP operational */
#define OSPF_IS_DROTHER 4 /* I'm on BCAST or NBMA and I'm not DR */
#define OSPF_IS_BACKUP 5 /* I'm BDR */
#define OSPF_IS_DR 6 /* I'm DR */
timer *wait_timer; /* WAIT timer */
timer *hello_timer; /* HELLOINT timer */
timer *rxmt_timer; /* RXMT timer */
@ -73,8 +76,8 @@ struct ospf_iface {
#define PRIORITY_D 1
#define HELLOINT_D 10
#define DEADC_D 4
#define WAIT_DMH 2 /* Value of Wait timer - not found it in RFC
* - using 2*HELLO
#define WAIT_DMH 3 /* Value of Wait timer - not found it in RFC
* - using 3*HELLO
*/
};
@ -161,4 +164,28 @@ struct ospf_neighbor
u8 adj; /* built adjacency? */
};
/* Definitions for interface state machine */
#define ISM_UP 0 /* Interface Up */
#define ISM_WAITF 1 /* Wait timer fired */
#define ISM_BACKS 2 /* Backup seen */
#define ISM_NEICH 3 /* Neighbor change */
#define ISM_LOOP 4 /* Loop indicated */
#define ISM_UNLOOP 5 /* Unloop indicated */
#define ISM_DOWN 6 /* Interface down */
/* Definitions for neighbor state machine */
#define INM_HELLOREC 0 /* Hello Received */
#define INM_START 1 /* Neighbor start - for NBMA */
#define INM_2WAYREC 2 /* 2-Way received */
#define INM_NEGDONE 3 /* Negotiation done */
#define INM_EXDONE 4 /* Exchange done */
#define INM_BADLSREQ 5 /* Bad LS Request */
#define INM_LOADDONE 6 /* Load done */
#define INM_ADJOK 7 /* AdjOK? */
#define INM_SEQMIS 8 /* Sequence number mismatch */
#define INM_1WAYREC 9 /* 1-Way */
#define INM_KILLNBR 10 /* Kill Neigbor */
#define INM_INACTTIM 11 /* Inactivity timer */
#define INM_LLDOWN 12 /* Line down */
#endif /* _BIRD_OSPF_H_ */