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bird/proto/ospf/iface.c
Ondrej Zajicek 354496ace8 Some fixes for TTL security.
2013-07-11 13:50:44 +02:00

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/*
* 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", "ptp", "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", "ptp", "ptmp", "virtual link" };
static void
poll_timer_hook(timer * timer)
{
ospf_hello_send(timer->data, OHS_POLL, NULL);
}
static void
hello_timer_hook(timer * timer)
{
ospf_hello_send(timer->data, OHS_HELLO, 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);
}
static void ospf_iface_change_mtu(struct proto_ospf *po, struct ospf_iface *ifa);
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;
}
}
struct nbma_node *
find_nbma_node_in(list *nnl, ip_addr ip)
{
struct nbma_node *nn;
WALK_LIST(nn, *nnl)
if (ipa_equal(nn->ip, ip))
return nn;
return NULL;
}
static int
ospf_sk_open(struct ospf_iface *ifa)
{
sock *sk = sk_new(ifa->pool);
sk->type = SK_IP;
sk->dport = OSPF_PROTO;
sk->saddr = IPA_NONE;
sk->tos = ifa->cf->tx_tos;
sk->priority = ifa->cf->tx_priority;
sk->rx_hook = ospf_rx_hook;
sk->tx_hook = ospf_tx_hook;
sk->err_hook = ospf_err_hook;
sk->iface = ifa->iface;
sk->rbsize = rxbufsize(ifa);
sk->tbsize = rxbufsize(ifa);
sk->data = (void *) ifa;
sk->flags = SKF_LADDR_RX | (ifa->check_ttl ? SKF_TTL_RX : 0);
sk->ttl = ifa->cf->ttl_security ? 255 : -1;
if (sk_open(sk) != 0)
goto err;
#ifdef OSPFv3
/* 12 is an offset of the checksum in an OSPF packet */
if (sk_set_ipv6_checksum(sk, 12) < 0)
goto err;
#endif
/*
* For OSPFv2: When sending a packet, it is important to have a
* proper source address. We expect that when we send one-hop
* unicast packets, OS chooses a source address according to the
* destination address (to be in the same prefix). We also expect
* that when we send multicast packets, OS uses the source address
* from sk->saddr registered to OS by sk_setup_multicast(). This
* behavior is needed to implement multiple virtual ifaces (struct
* ospf_iface) on one physical iface and is signalized by
* CONFIG_MC_PROPER_SRC.
*
* If this behavior is not available (for example on BSD), we create
* non-stub iface just for the primary IP address (see
* ospf_iface_stubby()) and we expect OS to use primary IP address
* as a source address for both unicast and multicast packets.
*
* FIXME: the primary IP address is currently just the
* lexicographically smallest address on an interface, it should be
* signalized by sysdep code which one is really the primary.
*/
sk->saddr = ifa->addr->ip;
if ((ifa->type == OSPF_IT_BCAST) || (ifa->type == OSPF_IT_PTP))
{
if (ifa->cf->real_bcast)
{
ifa->all_routers = ifa->addr->brd;
if (sk_set_broadcast(sk, 1) < 0)
goto err;
}
else
{
ifa->all_routers = AllSPFRouters;
sk->ttl = ifa->cf->ttl_security ? 255 : 1;
if (sk_setup_multicast(sk) < 0)
goto err;
if (sk_join_group(sk, ifa->all_routers) < 0)
goto err;
}
}
ifa->sk = sk;
ifa->sk_dr = 0;
return 1;
err:
rfree(sk);
return 0;
}
static inline void
ospf_sk_join_dr(struct ospf_iface *ifa)
{
if (ifa->sk_dr)
return;
sk_join_group(ifa->sk, AllDRouters);
ifa->sk_dr = 1;
}
static inline void
ospf_sk_leave_dr(struct ospf_iface *ifa)
{
if (!ifa->sk_dr)
return;
sk_leave_group(ifa->sk, AllDRouters);
ifa->sk_dr = 0;
}
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;
if (ifa->type != OSPF_IT_VLINK)
{
#ifdef OSPFv2
OSPF_TRACE(D_EVENTS, "Removing interface %s (%I/%d) from area %R",
ifa->iface->name, ifa->addr->prefix, ifa->addr->pxlen, ifa->oa->areaid);
#else
OSPF_TRACE(D_EVENTS, "Removing interface %s (IID %d) from area %R",
ifa->iface->name, ifa->instance_id, ifa->oa->areaid);
#endif
/* First of all kill all the related vlinks */
WALK_LIST(iff, po->iface_list)
{
if ((iff->type == OSPF_IT_VLINK) && (iff->vifa == ifa))
ospf_iface_sm(iff, ISM_DOWN);
}
}
WALK_LIST_DELSAFE(n, nx, ifa->neigh_list)
{
OSPF_TRACE(D_EVENTS, "Removing neighbor %I", n->ip);
ospf_neigh_remove(n);
}
if (ifa->hello_timer)
tm_stop(ifa->hello_timer);
if (ifa->poll_timer)
tm_stop(ifa->poll_timer);
if (ifa->wait_timer)
tm_stop(ifa->wait_timer);
if (ifa->type == OSPF_IT_VLINK)
{
ifa->vifa = NULL;
ifa->iface = NULL;
ifa->addr = NULL;
ifa->sk = NULL;
ifa->cost = 0;
ifa->vip = IPA_NONE;
}
ifa->rt_pos_beg = 0;
ifa->rt_pos_end = 0;
#ifdef OSPFv3
ifa->px_pos_beg = 0;
ifa->px_pos_end = 0;
#endif
}
void
ospf_iface_remove(struct ospf_iface *ifa)
{
struct proto *p = &ifa->oa->po->proto;
if (ifa->type == OSPF_IT_VLINK)
OSPF_TRACE(D_EVENTS, "Removing vlink to %R via area %R", ifa->vid, ifa->voa->areaid);
ospf_iface_sm(ifa, ISM_DOWN);
rem_node(NODE ifa);
rfree(ifa->pool);
}
void
ospf_iface_shutdown(struct ospf_iface *ifa)
{
if (ifa->state > OSPF_IS_DOWN)
ospf_hello_send(ifa, OHS_SHUTDOWN, NULL);
}
/**
* 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)
return;
ifa->state = state;
if (ifa->type == OSPF_IT_VLINK)
OSPF_TRACE(D_EVENTS, "Changing state of virtual link %R from %s to %s",
ifa->vid, ospf_is[oldstate], ospf_is[state]);
else
OSPF_TRACE(D_EVENTS, "Changing state of iface %s from %s to %s",
ifa->iface->name, ospf_is[oldstate], ospf_is[state]);
if ((ifa->type == OSPF_IT_BCAST) && !ifa->cf->real_bcast && ifa->sk)
{
if ((state == OSPF_IS_BACKUP) || (state == OSPF_IS_DR))
ospf_sk_join_dr(ifa);
else
ospf_sk_leave_dr(ifa);
}
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;
}
if ((oldstate > OSPF_IS_LOOP) && (state <= OSPF_IS_LOOP))
ospf_iface_down(ifa);
schedule_rt_lsa(ifa->oa);
// FIXME flushling of link LSA
}
/**
* 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 have slightly
* different handling of %DOWN and %LOOP state. We remove intefaces
* that are %DOWN. %DOWN state is used when an interface is waiting
* for a lock. %LOOP state is used when an interface does not have a
* link.
*/
void
ospf_iface_sm(struct ospf_iface *ifa, int event)
{
DBG("SM on %s %s. Event is '%s'\n", (ifa->type == OSPF_IT_VLINK) ? "vlink" : "iface",
ifa->iface ? ifa->iface->name : "(none)" , ospf_ism[event]);
switch (event)
{
case ISM_UP:
if (ifa->state <= OSPF_IS_LOOP)
{
/* Now, nothing should be adjacent */
if ((ifa->type == OSPF_IT_PTP) || (ifa->type == OSPF_IT_PTMP) || (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);
if (ifa->wait_timer)
tm_start(ifa->wait_timer, ifa->waitint);
}
}
if (ifa->hello_timer)
tm_start(ifa->hello_timer, ifa->helloint);
if (ifa->poll_timer)
tm_start(ifa->poll_timer, ifa->pollint);
ospf_hello_send(ifa, OHS_HELLO, NULL);
schedule_link_lsa(ifa);
}
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_LOOP:
if ((ifa->state > OSPF_IS_LOOP) && ifa->check_link)
ospf_iface_chstate(ifa, OSPF_IS_LOOP);
break;
case ISM_UNLOOP:
/* Immediate go UP */
if (ifa->state == OSPF_IS_LOOP)
ospf_iface_sm(ifa, ISM_UP);
break;
case ISM_DOWN:
ospf_iface_chstate(ifa, OSPF_IS_DOWN);
break;
default:
bug("OSPF_I_SM - Unknown event?");
break;
}
}
static u8
ospf_iface_classify_int(struct iface *ifa, struct ifa *addr)
{
if (ipa_nonzero(addr->opposite))
return (ifa->flags & IF_MULTICAST) ? OSPF_IT_PTP : OSPF_IT_PTMP;
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;
}
static inline u8
ospf_iface_classify(u8 type, struct ifa *addr)
{
return (type != OSPF_IT_UNDEF) ? type : ospf_iface_classify_int(addr->iface, addr);
}
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;
/* Open socket if interface is not stub */
if (! ifa->stub && ! ospf_sk_open(ifa))
{
log(L_ERR "%s: Socket open failed on interface %s, declaring as stub", p->name, ifa->iface->name);
ifa->ioprob = OSPF_I_SK;
ifa->stub = 1;
}
if (! ifa->stub)
{
ifa->hello_timer = tm_new_set(ifa->pool, hello_timer_hook, ifa, 0, ifa->helloint);
if (ifa->type == OSPF_IT_NBMA)
ifa->poll_timer = tm_new_set(ifa->pool, poll_timer_hook, ifa, 0, ifa->pollint);
if ((ifa->type == OSPF_IT_BCAST) || (ifa->type == OSPF_IT_NBMA))
ifa->wait_timer = tm_new_set(ifa->pool, wait_timer_hook, ifa, 0, 0);
}
/* Do iface UP, unless there is no link and we use link detection */
ospf_iface_sm(ifa, (ifa->check_link && !(ifa->iface->flags & IF_LINK_UP)) ? ISM_LOOP : ISM_UP);
}
static inline void
add_nbma_node(struct ospf_iface *ifa, struct nbma_node *src, int found)
{
struct nbma_node *n = mb_alloc(ifa->pool, sizeof(struct nbma_node));
add_tail(&ifa->nbma_list, NODE n);
n->ip = src->ip;
n->eligible = src->eligible;
n->found = found;
}
static int
ospf_iface_stubby(struct ospf_iface_patt *ip, struct ifa *addr)
{
if (! addr)
return 0;
/* a host/loopback address */
if (addr->flags & IA_HOST)
return 1;
/*
* We cannot properly support multiple OSPF ifaces on real iface
* with multiple prefixes, therefore we force OSPF ifaces with
* non-primary IP prefixes to be stub.
*/
#if defined(OSPFv2) && !defined(CONFIG_MC_PROPER_SRC)
if (! (addr->flags & IA_PRIMARY))
return 1;
#endif
return ip->stub;
}
void
ospf_iface_new(struct ospf_area *oa, struct ifa *addr, struct ospf_iface_patt *ip)
{
struct proto *p = &oa->po->proto;
struct iface *iface = addr ? addr->iface : NULL;
struct pool *pool;
struct ospf_iface *ifa;
struct nbma_node *nb;
struct object_lock *lock;
if (ip->type == OSPF_IT_VLINK)
OSPF_TRACE(D_EVENTS, "Adding vlink to %R via area %R", ip->vid, ip->voa);
else
{
#ifdef OSPFv2
OSPF_TRACE(D_EVENTS, "Adding interface %s (%I/%d) to area %R",
iface->name, addr->prefix, addr->pxlen, oa->areaid);
#else
OSPF_TRACE(D_EVENTS, "Adding interface %s (IID %d) to area %R",
iface->name, ip->instance_id, oa->areaid);
#endif
}
pool = rp_new(p->pool, "OSPF Interface");
ifa = mb_allocz(pool, sizeof(struct ospf_iface));
ifa->iface = iface;
ifa->addr = addr;
ifa->oa = oa;
ifa->cf = ip;
ifa->pool = pool;
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->deadint = ip->deadint;
ifa->stub = ospf_iface_stubby(ip, addr);
ifa->ioprob = OSPF_I_OK;
ifa->rxbuf = ip->rxbuf;
ifa->check_link = ip->check_link;
ifa->ecmp_weight = ip->ecmp_weight;
ifa->check_ttl = (ip->ttl_security == 1);
#ifdef OSPFv2
ifa->autype = ip->autype;
ifa->passwords = ip->passwords;
ifa->ptp_netmask = addr ? !(addr->flags & IA_PEER) : 0;
if (ip->ptp_netmask < 2)
ifa->ptp_netmask = ip->ptp_netmask;
#endif
#ifdef OSPFv3
ifa->instance_id = ip->instance_id;
#endif
ifa->type = ospf_iface_classify(ip->type, addr);
/* Check validity of interface type */
int old_type = ifa->type;
u32 if_multi_flag = ip->real_bcast ? IF_BROADCAST : IF_MULTICAST;
#ifdef OSPFv2
if ((ifa->type == OSPF_IT_BCAST) && (addr->flags & IA_PEER))
ifa->type = OSPF_IT_PTP;
if ((ifa->type == OSPF_IT_NBMA) && (addr->flags & IA_PEER))
ifa->type = OSPF_IT_PTMP;
#endif
if ((ifa->type == OSPF_IT_BCAST) && !(iface->flags & if_multi_flag))
ifa->type = OSPF_IT_NBMA;
if ((ifa->type == OSPF_IT_PTP) && !(iface->flags & if_multi_flag))
ifa->type = OSPF_IT_PTMP;
if (ifa->type != old_type)
log(L_WARN "%s: Cannot use interface %s as %s, forcing %s",
p->name, iface->name, ospf_it[old_type], ospf_it[ifa->type]);
/* Assign iface ID, for vlinks, this is ugly hack */
ifa->iface_id = (ifa->type != OSPF_IT_VLINK) ? iface->index : oa->po->last_vlink_id++;
init_list(&ifa->neigh_list);
init_list(&ifa->nbma_list);
WALK_LIST(nb, ip->nbma_list)
{
/* In OSPFv3, addr is link-local while configured neighbors could
have global IP (although RFC 5340 C.5 says link-local addresses
should be used). Because OSPFv3 iface is not subnet-specific,
there is no need for ipa_in_net() check */
#ifdef OSPFv2
if (!ipa_in_net(nb->ip, addr->prefix, addr->pxlen))
continue;
#else
if (!ipa_has_link_scope(nb->ip))
log(L_WARN "In OSPFv3, configured neighbor address (%I) should be link-local", nb->ip);
#endif
add_nbma_node(ifa, nb, 0);
}
ifa->state = OSPF_IS_DOWN;
add_tail(&oa->po->iface_list, NODE ifa);
if (ifa->type == OSPF_IT_VLINK)
{
ifa->voa = ospf_find_area(oa->po, ip->voa);
ifa->vid = ip->vid;
ifa->hello_timer = tm_new_set(ifa->pool, hello_timer_hook, ifa, 0, ifa->helloint);
return; /* Don't lock, don't add sockets */
}
/*
* In some cases we allow more ospf_ifaces on one physical iface.
* In OSPFv2, if they use different IP address prefix.
* In OSPFv3, if they use different instance_id.
* Therefore, we store such info to lock->addr field.
*/
lock = olock_new(pool);
#ifdef OSPFv2
lock->addr = ifa->addr->prefix;
#else /* OSPFv3 */
lock->addr = _MI(0,0,0,ifa->instance_id);
#endif
lock->type = OBJLOCK_IP;
lock->port = OSPF_PROTO;
lock->iface = iface;
lock->data = ifa;
lock->hook = ospf_iface_add;
olock_acquire(lock);
}
static void
ospf_iface_change_timer(timer *tm, unsigned val)
{
if (!tm)
return;
tm->recurrent = val;
if (tm->expires)
tm_start(tm, val);
}
int
ospf_iface_reconfigure(struct ospf_iface *ifa, struct ospf_iface_patt *new)
{
struct proto *p = &ifa->oa->po->proto;
struct nbma_node *nb, *nbx;
char *ifname = (ifa->type != OSPF_IT_VLINK) ? ifa->iface->name : "vlink";
/* Type could be changed in ospf_iface_new(),
but if config values are same then also results are same */
int old_type = ospf_iface_classify(ifa->cf->type, ifa->addr);
int new_type = ospf_iface_classify(new->type, ifa->addr);
if (old_type != new_type)
return 0;
int new_stub = ospf_iface_stubby(new, ifa->addr);
if (ifa->stub != new_stub)
return 0;
/* Change of these options would require to reset the iface socket */
if ((new->real_bcast != ifa->cf->real_bcast) ||
(new->tx_tos != ifa->cf->tx_tos) ||
(new->tx_priority != ifa->cf->tx_priority) ||
(new->ttl_security != ifa->cf->ttl_security))
return 0;
ifa->cf = new;
ifa->marked = 0;
/* HELLO TIMER */
if (ifa->helloint != new->helloint)
{
OSPF_TRACE(D_EVENTS, "Changing hello interval on interface %s from %d to %d",
ifname, ifa->helloint, new->helloint);
ifa->helloint = new->helloint;
ospf_iface_change_timer(ifa->hello_timer, ifa->helloint);
}
/* RXMT TIMER */
if (ifa->rxmtint != new->rxmtint)
{
OSPF_TRACE(D_EVENTS, "Changing retransmit interval on interface %s from %d to %d",
ifname, ifa->rxmtint, new->rxmtint);
ifa->rxmtint = new->rxmtint;
}
/* POLL TIMER */
if (ifa->pollint != new->pollint)
{
OSPF_TRACE(D_EVENTS, "Changing poll interval on interface %s from %d to %d",
ifname, ifa->pollint, new->pollint);
ifa->pollint = new->pollint;
ospf_iface_change_timer(ifa->poll_timer, ifa->pollint);
}
/* WAIT TIMER */
if (ifa->waitint != new->waitint)
{
OSPF_TRACE(D_EVENTS, "Changing wait interval on interface %s from %d to %d",
ifname, ifa->waitint, new->waitint);
ifa->waitint = new->waitint;
if (ifa->wait_timer && ifa->wait_timer->expires)
tm_start(ifa->wait_timer, ifa->waitint);
}
/* DEAD TIMER */
if (ifa->deadint != new->deadint)
{
OSPF_TRACE(D_EVENTS, "Changing dead interval on interface %s from %d to %d",
ifname, ifa->deadint, new->deadint);
ifa->deadint = new->deadint;
}
/* INFTRANS */
if (ifa->inftransdelay != new->inftransdelay)
{
OSPF_TRACE(D_EVENTS, "Changing transmit delay on interface %s from %d to %d",
ifname, ifa->inftransdelay, new->inftransdelay);
ifa->inftransdelay = new->inftransdelay;
}
#ifdef OSPFv2
/* AUTHENTICATION */
if (ifa->autype != new->autype)
{
OSPF_TRACE(D_EVENTS, "Changing authentication type on interface %s", ifname);
ifa->autype = new->autype;
}
/* Update passwords */
ifa->passwords = new->passwords;
#endif
/* Remaining options are just for proper interfaces */
if (ifa->type == OSPF_IT_VLINK)
return 1;
/* COST */
if (ifa->cost != new->cost)
{
OSPF_TRACE(D_EVENTS, "Changing cost on interface %s from %d to %d",
ifname, ifa->cost, new->cost);
ifa->cost = new->cost;
}
/* PRIORITY */
if (ifa->priority != new->priority)
{
OSPF_TRACE(D_EVENTS, "Changing priority on interface %s from %d to %d",
ifname, ifa->priority, new->priority);
ifa->priority = new->priority;
}
/* STRICT NBMA */
if (ifa->strictnbma != new->strictnbma)
{
OSPF_TRACE(D_EVENTS, "Changing NBMA strictness on interface %s", ifname);
ifa->strictnbma = new->strictnbma;
}
/* NBMA LIST - remove or update old */
WALK_LIST_DELSAFE(nb, nbx, ifa->nbma_list)
{
struct nbma_node *nb2 = find_nbma_node_in(&new->nbma_list, nb->ip);
if (nb2)
{
if (nb->eligible != nb2->eligible)
{
OSPF_TRACE(D_EVENTS, "Changing eligibility of neighbor %I on interface %s",
nb->ip, ifname);
nb->eligible = nb2->eligible;
}
}
else
{
OSPF_TRACE(D_EVENTS, "Removing NBMA neighbor %I on interface %s",
nb->ip, ifname);
rem_node(NODE nb);
mb_free(nb);
}
}
/* NBMA LIST - add new */
WALK_LIST(nb, new->nbma_list)
{
/* See related note in ospf_iface_new() */
#ifdef OSPFv2
if (!ipa_in_net(nb->ip, ifa->addr->prefix, ifa->addr->pxlen))
continue;
#else
if (!ipa_has_link_scope(nb->ip))
log(L_WARN "In OSPFv3, configured neighbor address (%I) should be link-local", nb->ip);
#endif
if (! find_nbma_node(ifa, nb->ip))
{
OSPF_TRACE(D_EVENTS, "Adding NBMA neighbor %I on interface %s",
nb->ip, ifname);
add_nbma_node(ifa, nb, !!find_neigh_by_ip(ifa, nb->ip));
}
}
/* RX BUFF */
if (ifa->rxbuf != new->rxbuf)
{
OSPF_TRACE(D_EVENTS, "Changing rxbuf interface %s from %d to %d",
ifname, ifa->rxbuf, new->rxbuf);
ifa->rxbuf = new->rxbuf;
ospf_iface_change_mtu(ifa->oa->po, ifa);
}
/* LINK */
if (ifa->check_link != new->check_link)
{
OSPF_TRACE(D_EVENTS, "%s link check on interface %s",
new->check_link ? "Enabling" : "Disabling", ifname);
ifa->check_link = new->check_link;
if (!(ifa->iface->flags & IF_LINK_UP))
ospf_iface_sm(ifa, ifa->check_link ? ISM_LOOP : ISM_UNLOOP);
}
/* ECMP weight */
if (ifa->ecmp_weight != new->ecmp_weight)
{
OSPF_TRACE(D_EVENTS, "Changing ECMP weight of interface %s from %d to %d",
ifname, (int)ifa->ecmp_weight + 1, (int)new->ecmp_weight + 1);
ifa->ecmp_weight = new->ecmp_weight;
}
/* instance_id is not updated - it is part of key */
return 1;
}
#ifdef OSPFv2
static inline struct ospf_iface_patt *
ospf_iface_patt_find(struct ospf_area_config *ac, struct ifa *a)
{
return (struct ospf_iface_patt *) iface_patt_find(&ac->patt_list, a->iface, a);
}
void
ospf_ifa_notify(struct proto *p, unsigned flags, struct ifa *a)
{
struct proto_ospf *po = (struct proto_ospf *) p;
if (a->flags & IA_SECONDARY)
return;
if (a->scope <= SCOPE_LINK)
return;
/* In OSPFv2, we create OSPF iface for each address. */
if (flags & IF_CHANGE_UP)
{
int done = 0;
struct ospf_area *oa;
WALK_LIST(oa, po->area_list)
{
struct ospf_iface_patt *ip;
if (ip = ospf_iface_patt_find(oa->ac, a))
{
if (!done)
ospf_iface_new(oa, a, ip);
done++;
}
}
if (done > 1)
log(L_WARN "%s: Interface %s (IP %I) matches for multiple areas", p->name, a->iface->name, a->ip);
}
if (flags & IF_CHANGE_DOWN)
{
struct ospf_iface *ifa, *ifx;
WALK_LIST_DELSAFE(ifa, ifx, po->iface_list)
{
if ((ifa->type != OSPF_IT_VLINK) && (ifa->addr == a))
ospf_iface_remove(ifa);
/* See a note in ospf_iface_notify() */
}
}
}
static struct ospf_iface *
ospf_iface_find_by_key(struct ospf_area *oa, struct ifa *a)
{
struct ospf_iface *ifa;
WALK_LIST(ifa, oa->po->iface_list)
if ((ifa->addr == a) && (ifa->oa == oa) && (ifa->type != OSPF_IT_VLINK))
return ifa;
return NULL;
}
void
ospf_ifaces_reconfigure(struct ospf_area *oa, struct ospf_area_config *nac)
{
struct ospf_iface_patt *ip;
struct iface *iface;
struct ifa *a;
WALK_LIST(iface, iface_list)
{
if (! (iface->flags & IF_UP))
continue;
WALK_LIST(a, iface->addrs)
{
if (a->flags & IA_SECONDARY)
continue;
if (a->scope <= SCOPE_LINK)
continue;
if (ip = ospf_iface_patt_find(oa->ac, a))
{
/* Main inner loop */
struct ospf_iface *ifa = ospf_iface_find_by_key(oa, a);
if (ifa)
{
if (ospf_iface_reconfigure(ifa, ip))
continue;
/* Hard restart */
ospf_iface_shutdown(ifa);
ospf_iface_remove(ifa);
}
ospf_iface_new(oa, a, ip);
}
}
}
}
#else /* OSPFv3 */
struct ospf_iface_patt *
ospf_iface_patt_find(struct ospf_area_config *ac, struct iface *iface, int iid)
{
struct ospf_iface_patt *pt, *res = NULL;
WALK_LIST(pt, ac->patt_list)
if ((pt->instance_id >= iid) && (iface_patt_match(&pt->i, iface, NULL)) &&
(!res || (pt->instance_id < res->instance_id)))
res = pt;
return res;
}
void
ospf_ifa_notify(struct proto *p, unsigned flags, struct ifa *a)
{
struct proto_ospf *po = (struct proto_ospf *) p;
if (a->flags & IA_SECONDARY)
return;
if (a->scope < SCOPE_LINK)
return;
/* In OSPFv3, we create OSPF iface for link-local address,
other addresses are used for link-LSA. */
if (a->scope == SCOPE_LINK)
{
if (flags & IF_CHANGE_UP)
{
int done0 = 0;
struct ospf_area *oa;
WALK_LIST(oa, po->area_list)
{
int iid = 0;
struct ospf_iface_patt *ip;
while (ip = ospf_iface_patt_find(oa->ac, a->iface, iid))
{
ospf_iface_new(oa, a, ip);
if (ip->instance_id == 0)
done0++;
iid = ip->instance_id + 1;
}
}
if (done0 > 1)
log(L_WARN "%s: Interface %s matches for multiple areas",
p->name, a->iface->name);
}
if (flags & IF_CHANGE_DOWN)
{
struct ospf_iface *ifa, *ifx;
WALK_LIST_DELSAFE(ifa, ifx, po->iface_list)
{
if ((ifa->type != OSPF_IT_VLINK) && (ifa->addr == a))
ospf_iface_remove(ifa);
/* See a note in ospf_iface_notify() */
}
}
}
else
{
struct ospf_iface *ifa;
WALK_LIST(ifa, po->iface_list)
{
if (ifa->iface == a->iface)
{
schedule_rt_lsa(ifa->oa);
/* Event 5 from RFC5340 4.4.3. */
schedule_link_lsa(ifa);
return;
}
}
}
}
static struct ospf_iface *
ospf_iface_find_by_key(struct ospf_area *oa, struct ifa *a, int iid)
{
struct ospf_iface *ifa;
WALK_LIST(ifa, oa->po->iface_list)
if ((ifa->addr == a) && (ifa->oa == oa) && (ifa->instance_id == iid) && (ifa->type != OSPF_IT_VLINK))
return ifa;
return NULL;
}
void
ospf_ifaces_reconfigure(struct ospf_area *oa, struct ospf_area_config *nac)
{
struct ospf_iface_patt *ip;
struct iface *iface;
struct ifa *a;
WALK_LIST(iface, iface_list)
{
if (! (iface->flags & IF_UP))
continue;
WALK_LIST(a, iface->addrs)
{
if (a->flags & IA_SECONDARY)
continue;
if (a->scope != SCOPE_LINK)
continue;
int iid = 0;
while (ip = ospf_iface_patt_find(nac, iface, iid))
{
iid = ip->instance_id + 1;
/* Main inner loop */
struct ospf_iface *ifa = ospf_iface_find_by_key(oa, a, ip->instance_id);
if (ifa)
{
if (ospf_iface_reconfigure(ifa, ip))
continue;
/* Hard restart */
ospf_iface_shutdown(ifa);
ospf_iface_remove(ifa);
}
ospf_iface_new(oa, a, ip);
}
}
}
}
#endif
static 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->sk)
{
ifa->sk->rbsize = rxbufsize(ifa);
ifa->sk->tbsize = rxbufsize(ifa);
sk_reallocate(ifa->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 */
mb_free(op);
}
}
static void
ospf_iface_notify(struct proto_ospf *po, unsigned flags, struct ospf_iface *ifa)
{
if (flags & IF_CHANGE_DOWN)
{
ospf_iface_remove(ifa);
return;
}
if (flags & IF_CHANGE_LINK)
ospf_iface_sm(ifa, (ifa->iface->flags & IF_LINK_UP) ? ISM_UNLOOP : ISM_LOOP);
if (flags & IF_CHANGE_MTU)
ospf_iface_change_mtu(po, ifa);
}
void
ospf_if_notify(struct proto *p, unsigned flags, struct iface *iface)
{
struct proto_ospf *po = (struct proto_ospf *) p;
/*
if (iface->flags & IF_IGNORE)
return;
*/
/* Going up means that there are no such ifaces yet */
if (flags & IF_CHANGE_UP)
return;
struct ospf_iface *ifa, *ifx;
WALK_LIST_DELSAFE(ifa, ifx, po->iface_list)
if ((ifa->type != OSPF_IT_VLINK) && (ifa->iface == iface))
ospf_iface_notify(po, flags, ifa);
/* We use here that even shutting down iface also shuts down
the vlinks, but vlinks are not freed and stays in the
iface_list even when down */
}
void
ospf_iface_info(struct ospf_iface *ifa)
{
char *more = "";
if (ifa->strictnbma &&
((ifa->type == OSPF_IT_NBMA) || (ifa->type == OSPF_IT_PTMP)))
more = " (strict)";
if (ifa->cf->real_bcast &&
((ifa->type == OSPF_IT_BCAST) || (ifa->type == OSPF_IT_PTP)))
more = " (real)";
if (ifa->type == OSPF_IT_VLINK)
{
cli_msg(-1015, "Virtual link to %R:", ifa->vid);
cli_msg(-1015, "\tPeer IP: %I", ifa->vip);
cli_msg(-1015, "\tTransit area: %R (%u)", ifa->voa->areaid,
ifa->voa->areaid);
cli_msg(-1015, "\tInterface: \"%s\"",
(ifa->iface ? ifa->iface->name : "(none)"));
}
else
{
#ifdef OSPFv2
if (ifa->addr->flags & IA_PEER)
cli_msg(-1015, "Interface %s (peer %I)", ifa->iface->name, ifa->addr->opposite);
else
cli_msg(-1015, "Interface %s (%I/%d)", ifa->iface->name, ifa->addr->prefix, ifa->addr->pxlen);
#else /* OSPFv3 */
cli_msg(-1015, "Interface %s (IID %d)", ifa->iface->name, ifa->instance_id);
#endif
cli_msg(-1015, "\tType: %s%s", ospf_it[ifa->type], more);
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);
if (ifa->oa->po->ecmp)
cli_msg(-1015, "\tECMP weight: %d", ((int) ifa->ecmp_weight) + 1);
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->deadint);
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);
}
}
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