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bird/proto/ospf/iface.c
Ondrej Zajicek 70e212f913 Implements TTL security for OSPF and RIP. 
Interfaces for OSPF and RIP could be configured to use (and request)
TTL 255 for traffic to direct neighbors.

Thanks to Simon Dickhoven for the original patch for RIPng.
2013-06-25 15:39:44 +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);
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))
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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