bird/proto/ospf/iface.c
2009-08-21 09:27:52 +02:00

635 lines
15 KiB
C

/*
* BIRD -- OSPF
*
* (c) 1999--2005 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "ospf.h"
char *ospf_is[] = { "down", "loop", "waiting", "point-to-point", "drother",
"backup", "dr"
};
char *ospf_ism[] = { "interface up", "wait timer fired", "backup seen",
"neighbor change", "loop indicated", "unloop indicated", "interface down"
};
char *ospf_it[] = { "broadcast", "nbma", "point-to-point", "virtual link" };
static void
poll_timer_hook(timer * timer)
{
log("POLL!");
ospf_hello_send(timer, 1, NULL);
}
static void
hello_timer_hook(timer * timer)
{
ospf_hello_send(timer, 0, NULL);
}
static void
wait_timer_hook(timer * timer)
{
struct ospf_iface *ifa = (struct ospf_iface *) timer->data;
struct proto *p = &ifa->oa->po->proto;
OSPF_TRACE(D_EVENTS, "Wait timer fired on interface %s.", ifa->iface->name);
ospf_iface_sm(ifa, ISM_WAITF);
}
u32
rxbufsize(struct ospf_iface *ifa)
{
switch(ifa->rxbuf)
{
case OSPF_RXBUF_NORMAL:
return (ifa->iface->mtu * 2);
break;
case OSPF_RXBUF_LARGE:
return OSPF_MAX_PKT_SIZE;
break;
default:
return ifa->rxbuf;
break;
}
}
static sock *
ospf_open_ip_socket(struct ospf_iface *ifa)
{
sock *ipsk;
struct proto *p = &ifa->oa->po->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;
if (ifa->type == OSPF_IT_VLINK)
ipsk->ttl = 255;
ipsk->rx_hook = ospf_rx_hook;
ipsk->tx_hook = ospf_tx_hook;
ipsk->err_hook = ospf_err_hook;
ipsk->iface = ifa->iface;
ipsk->rbsize = rxbufsize(ifa);
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);
}
/**
* ospf_iface_chstate - handle changes of interface state
* @ifa: OSPF interface
* @state: new state
*
* Many actions must be taken according to interface state changes. New network
* LSAs must be originated, flushed, new multicast sockets to listen for messages for
* %ALLDROUTERS have to be opened, etc.
*/
void
ospf_iface_chstate(struct ospf_iface *ifa, u8 state)
{
struct proto_ospf *po = ifa->oa->po;
struct proto *p = &po->proto;
u8 oldstate = ifa->state;
if (oldstate != state)
{
ifa->state = state;
if (ifa->type == OSPF_IT_VLINK)
{
OSPF_TRACE(D_EVENTS,
"Changing state of virtual link %R from \"%s\" into \"%s\".",
ifa->vid, ospf_is[oldstate], ospf_is[state]);
if (state == OSPF_IS_PTP)
{
ifa->ip_sk = ospf_open_ip_socket(ifa);
}
}
else
{
OSPF_TRACE(D_EVENTS,
"Changing state of iface: %s from \"%s\" into \"%s\".",
ifa->iface->name, ospf_is[oldstate], ospf_is[state]);
if (ifa->iface->flags & IF_MULTICAST)
{
if ((state == OSPF_IS_BACKUP) || (state == OSPF_IS_DR))
{
if ((ifa->dr_sk == NULL) && (ifa->type != OSPF_IT_NBMA))
{
DBG("%s: Adding new multicast socket for (B)DR\n", p->name);
ifa->dr_sk = sk_new(p->pool);
ifa->dr_sk->type = SK_IP_MC;
ifa->dr_sk->sport = 0;
ifa->dr_sk->dport = OSPF_PROTO;
ifa->dr_sk->saddr = AllDRouters;
ifa->dr_sk->daddr = AllDRouters;
ifa->dr_sk->tos = IP_PREC_INTERNET_CONTROL;
ifa->dr_sk->ttl = 1;
ifa->dr_sk->rx_hook = ospf_rx_hook;
ifa->dr_sk->tx_hook = ospf_tx_hook;
ifa->dr_sk->err_hook = ospf_err_hook;
ifa->dr_sk->iface = ifa->iface;
ifa->dr_sk->rbsize = rxbufsize(ifa);
ifa->dr_sk->tbsize = ifa->iface->mtu;
ifa->dr_sk->data = (void *) ifa;
if (sk_open(ifa->dr_sk) != 0)
{
DBG("%s: SK_OPEN: new? mc open failed.\n", p->name);
}
}
}
else
{
rfree(ifa->dr_sk);
ifa->dr_sk = NULL;
}
if ((oldstate == OSPF_IS_DR) && (ifa->net_lsa != NULL))
{
ifa->net_lsa->lsa.age = LSA_MAXAGE;
if (state >= OSPF_IS_WAITING)
{
ospf_lsupd_flush_nlsa(po, ifa->net_lsa);
}
if (can_flush_lsa(po))
flush_lsa(ifa->net_lsa, po);
ifa->net_lsa = NULL;
}
}
}
}
}
static void
ospf_iface_down(struct ospf_iface *ifa)
{
struct ospf_neighbor *n, *nx;
struct proto_ospf *po = ifa->oa->po;
struct proto *p = &po->proto;
struct ospf_iface *iff;
/* First of all kill all the related vlinks */
if (ifa->type != OSPF_IT_VLINK)
{
WALK_LIST(iff, po->iface_list)
{
if ((iff->type == OSPF_IT_VLINK) && (iff->iface == ifa->iface))
ospf_iface_down(iff);
}
}
WALK_LIST_DELSAFE(n, nx, ifa->neigh_list)
{
OSPF_TRACE(D_EVENTS, "Removing neighbor %I", n->ip);
ospf_neigh_remove(n);
}
rfree(ifa->hello_sk);
rfree(ifa->dr_sk);
rfree(ifa->ip_sk);
if (ifa->type == OSPF_IT_VLINK)
{
ifa->ip_sk = NULL;
ifa->iface = NULL;
return;
}
else
{
rfree(ifa->wait_timer);
rfree(ifa->hello_timer);
rfree(ifa->poll_timer);
rfree(ifa->lock);
rem_node(NODE ifa);
mb_free(ifa);
}
}
/**
* ospf_iface_sm - OSPF interface state machine
* @ifa: OSPF interface
* @event: event comming to state machine
*
* This fully respects 9.3 of RFC 2328 except we don't use %LOOP state of
* interface.
*/
void
ospf_iface_sm(struct ospf_iface *ifa, int event)
{
struct ospf_area *oa = ifa->oa;
DBG("SM on iface %s. Event is '%s'\n", ifa->iface->name, ospf_ism[event]);
switch (event)
{
case ISM_UP:
if (ifa->state == OSPF_IS_DOWN)
{
/* Now, nothing should be adjacent */
if ((ifa->type == OSPF_IT_PTP) || (ifa->type == OSPF_IT_VLINK))
{
ospf_iface_chstate(ifa, OSPF_IS_PTP);
}
else
{
if (ifa->priority == 0)
ospf_iface_chstate(ifa, OSPF_IS_DROTHER);
else
{
ospf_iface_chstate(ifa, OSPF_IS_WAITING);
tm_start(ifa->wait_timer, ifa->waitint);
}
}
tm_start(ifa->hello_timer, ifa->helloint);
if (ifa->poll_timer)
tm_start(ifa->poll_timer, ifa->pollint);
hello_timer_hook(ifa->hello_timer);
}
schedule_rt_lsa(ifa->oa);
break;
case ISM_BACKS:
case ISM_WAITF:
if (ifa->state == OSPF_IS_WAITING)
{
bdr_election(ifa);
}
break;
case ISM_NEICH:
if ((ifa->state == OSPF_IS_DROTHER) || (ifa->state == OSPF_IS_DR) ||
(ifa->state == OSPF_IS_BACKUP))
{
bdr_election(ifa);
schedule_rt_lsa(ifa->oa);
}
break;
case ISM_DOWN:
ospf_iface_chstate(ifa, OSPF_IS_DOWN);
ospf_iface_down(ifa);
schedule_rt_lsa(oa);
break;
case ISM_LOOP: /* Useless? */
ospf_iface_chstate(ifa, OSPF_IS_LOOP);
ospf_iface_down(ifa);
schedule_rt_lsa(ifa->oa);
break;
case ISM_UNLOOP:
ospf_iface_chstate(ifa, OSPF_IS_DOWN);
schedule_rt_lsa(ifa->oa);
break;
default:
bug("OSPF_I_SM - Unknown event?");
break;
}
}
static sock *
ospf_open_mc_socket(struct ospf_iface *ifa)
{
sock *mcsk;
struct proto *p = &ifa->oa->po->proto;
mcsk = sk_new(p->pool);
mcsk->type = SK_IP_MC;
mcsk->sport = 0;
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 = rxbufsize(ifa);
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);
}
u8
ospf_iface_clasify(struct iface * ifa)
{
if ((ifa->flags & (IF_MULTIACCESS | IF_MULTICAST)) ==
(IF_MULTIACCESS | IF_MULTICAST))
return OSPF_IT_BCAST;
if ((ifa->flags & (IF_MULTIACCESS | IF_MULTICAST)) == IF_MULTIACCESS)
return OSPF_IT_NBMA;
return OSPF_IT_PTP;
}
struct ospf_iface *
ospf_iface_find(struct proto_ospf *p, struct iface *what)
{
struct ospf_iface *i;
WALK_LIST(i, p->iface_list) if ((i->iface == what) && (i->type != OSPF_IT_VLINK))
return i;
return NULL;
}
static void
ospf_iface_add(struct object_lock *lock)
{
struct ospf_iface *ifa = lock->data;
struct proto_ospf *po = ifa->oa->po;
struct proto *p = &po->proto;
struct iface *iface = lock->iface;
ifa->lock = lock;
ifa->ioprob = OSPF_I_OK;
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);
log("%s: Declaring as stub.", p->name);
ifa->stub = 1;
ifa->ioprob += OSPF_I_MC;
}
ifa->dr_sk = NULL;
}
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);
log("%s: Declaring as stub.", p->name);
ifa->stub = 1;
ifa->ioprob += OSPF_I_IP;
}
ifa->state = OSPF_IS_DOWN;
ospf_iface_sm(ifa, ISM_UP);
}
void
ospf_iface_new(struct proto_ospf *po, struct iface *iface,
struct ospf_area_config *ac, struct ospf_iface_patt *ip)
{
struct proto *p = &po->proto;
struct ospf_iface *ifa;
struct nbma_node *nbma, *nb;
struct object_lock *lock;
struct ospf_area *oa;
ifa = mb_allocz(p->pool, sizeof(struct ospf_iface));
ifa->iface = iface;
ifa->cost = ip->cost;
ifa->rxmtint = ip->rxmtint;
ifa->inftransdelay = ip->inftransdelay;
ifa->priority = ip->priority;
ifa->helloint = ip->helloint;
ifa->pollint = ip->pollint;
ifa->strictnbma = ip->strictnbma;
ifa->waitint = ip->waitint;
ifa->dead = (ip->dead == 0) ? ip->deadc * ifa->helloint : ip->dead;
ifa->stub = ip->stub;
#ifdef OSPFv2
ifa->autype = ip->autype;
ifa->passwords = ip->passwords;
#endif
#ifdef OSPFv3
ifa->instance_id = ip->instance_id;
#endif
ifa->rxbuf = ip->rxbuf;
if (ip->type == OSPF_IT_UNDEF)
ifa->type = ospf_iface_clasify(ifa->iface);
else
ifa->type = ip->type;
init_list(&ifa->neigh_list);
init_list(&ifa->nbma_list);
WALK_LIST(nb, ip->nbma_list)
{
nbma = mb_alloc(p->pool, sizeof(struct nbma_node));
nbma->ip = nb->ip;
nbma->eligible = nb->eligible;
add_tail(&ifa->nbma_list, NODE nbma);
}
/* Add hello timer */
ifa->hello_timer = tm_new(p->pool);
ifa->hello_timer->data = ifa;
ifa->hello_timer->randomize = 0;
ifa->hello_timer->hook = hello_timer_hook;
ifa->hello_timer->recurrent = ifa->helloint;
DBG("%s: Installing hello timer. (%u)\n", p->name, ifa->helloint);
if (ifa->type == OSPF_IT_NBMA)
{
ifa->poll_timer = tm_new(p->pool);
ifa->poll_timer->data = ifa;
ifa->poll_timer->randomize = 0;
ifa->poll_timer->hook = poll_timer_hook;
ifa->poll_timer->recurrent = ifa->pollint;
DBG("%s: Installing poll timer. (%u)\n", p->name, ifa->pollint);
}
else
ifa->poll_timer = NULL;
ifa->wait_timer = tm_new(p->pool);
ifa->wait_timer->data = ifa;
ifa->wait_timer->randomize = 0;
ifa->wait_timer->hook = wait_timer_hook;
ifa->wait_timer->recurrent = 0;
DBG("%s: Installing wait timer. (%u)\n", p->name, ifa->waitint);
add_tail(&((struct proto_ospf *) p)->iface_list, NODE ifa);
ifa->state = OSPF_IS_DOWN;
ifa->oa = NULL;
WALK_LIST(oa, po->area_list)
{
if (oa->areaid == ac->areaid)
{
ifa->oa = oa;
break;
}
}
if (!ifa->oa)
bug("Cannot add any area to accepted Interface");
else
if (ifa->type == OSPF_IT_VLINK)
{
ifa->oa = po->backbone;
ifa->voa = oa;
ifa->vid = ip->vid;
return; /* Don't lock, don't add sockets */
}
lock = olock_new(p->pool);
lock->addr = AllSPFRouters;
lock->type = OBJLOCK_IP;
lock->port = OSPF_PROTO;
lock->iface = iface;
lock->data = ifa;
lock->hook = ospf_iface_add;
olock_acquire(lock);
}
void
ospf_iface_change_mtu(struct proto_ospf *po, struct ospf_iface *ifa)
{
struct proto *p = &po->proto;
struct ospf_packet *op;
struct ospf_neighbor *n;
OSPF_TRACE(D_EVENTS, "Changing MTU on interface %s.", ifa->iface->name);
if (ifa->hello_sk)
{
ifa->hello_sk->rbsize = rxbufsize(ifa);
ifa->hello_sk->tbsize = ifa->iface->mtu;
sk_reallocate(ifa->hello_sk);
}
if (ifa->dr_sk)
{
ifa->dr_sk->rbsize = rxbufsize(ifa);
ifa->dr_sk->tbsize = ifa->iface->mtu;
sk_reallocate(ifa->dr_sk);
}
if (ifa->ip_sk)
{
ifa->ip_sk->rbsize = rxbufsize(ifa);
ifa->ip_sk->tbsize = ifa->iface->mtu;
sk_reallocate(ifa->ip_sk);
}
WALK_LIST(n, ifa->neigh_list)
{
op = (struct ospf_packet *) n->ldbdes;
n->ldbdes = mb_allocz(n->pool, ifa->iface->mtu);
if (ntohs(op->length) <= ifa->iface->mtu) /* If the packet in old buffer is bigger, let it filled by zeros */
memcpy(n->ldbdes, op, ifa->iface->mtu); /* If the packet is old is same or smaller, copy it */
rfree(op);
}
}
void
ospf_iface_notify(struct proto *p, unsigned flags, struct iface *iface)
{
struct proto_ospf *po = (struct proto_ospf *) p;
struct ospf_config *c = (struct ospf_config *) (p->cf);
struct ospf_area_config *ac;
struct ospf_iface_patt *ip = NULL;
struct ospf_iface *ifa;
DBG("%s: If notify called\n", p->name);
if (iface->flags & IF_IGNORE)
return;
if (flags & IF_CHANGE_UP)
{
WALK_LIST(ac, c->area_list)
{
if (ip = (struct ospf_iface_patt *)
iface_patt_find(&ac->patt_list, iface))
break;
}
if (ip)
{
OSPF_TRACE(D_EVENTS, "Using interface %s.", iface->name);
ospf_iface_new(po, iface, ac, ip);
}
}
if (flags & IF_CHANGE_DOWN)
{
if ((ifa = ospf_iface_find((struct proto_ospf *) p, iface)) != NULL)
{
OSPF_TRACE(D_EVENTS, "Killing interface %s.", iface->name);
ospf_iface_sm(ifa, ISM_DOWN);
}
}
if (flags & IF_CHANGE_MTU)
{
if ((ifa = ospf_iface_find((struct proto_ospf *) p, iface)) != NULL)
ospf_iface_change_mtu(po, ifa);
}
}
void
ospf_iface_info(struct ospf_iface *ifa)
{
char *strict = "(strict)";
if ((ifa->type != OSPF_IT_NBMA) || (ifa->strictnbma == 0))
strict = "";
if (ifa->type == OSPF_IT_VLINK)
{
cli_msg(-1015, "Virtual link to %R:", ifa->vid);
cli_msg(-1015, "\tTransit area: %R (%u)", ifa->voa->areaid,
ifa->voa->areaid);
}
else
{
cli_msg(-1015, "Interface \"%s\":",
(ifa->iface ? ifa->iface->name : "(none)"));
cli_msg(-1015, "\tType: %s %s", ospf_it[ifa->type], strict);
cli_msg(-1015, "\tArea: %R (%u)", ifa->oa->areaid, ifa->oa->areaid);
}
cli_msg(-1015, "\tState: %s %s", ospf_is[ifa->state],
ifa->stub ? "(stub)" : "");
cli_msg(-1015, "\tPriority: %u", ifa->priority);
cli_msg(-1015, "\tCost: %u", ifa->cost);
cli_msg(-1015, "\tHello timer: %u", ifa->helloint);
if (ifa->type == OSPF_IT_NBMA)
{
cli_msg(-1015, "\tPoll timer: %u", ifa->pollint);
}
cli_msg(-1015, "\tWait timer: %u", ifa->waitint);
cli_msg(-1015, "\tDead timer: %u", ifa->dead);
cli_msg(-1015, "\tRetransmit timer: %u", ifa->rxmtint);
if ((ifa->type == OSPF_IT_BCAST) || (ifa->type == OSPF_IT_NBMA))
{
cli_msg(-1015, "\tDesigned router (ID): %R", ifa->drid);
cli_msg(-1015, "\tDesigned router (IP): %I", ifa->drip);
cli_msg(-1015, "\tBackup designed router (ID): %R", ifa->bdrid);
cli_msg(-1015, "\tBackup designed router (IP): %I", ifa->bdrip);
}
}
void
ospf_iface_shutdown(struct ospf_iface *ifa)
{
init_list(&ifa->neigh_list);
hello_timer_hook(ifa->hello_timer);
}