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labs-bird/proto/ospf/iface.c
Maria Matejka ceef6de459 OSPF: Setting a list node NULL before use
2021-09-10 17:38:22 +02:00

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/*
* BIRD -- OSPF
*
* (c) 1999--2005 Ondrej Filip <feela@network.cz>
* (c) 2009--2014 Ondrej Zajicek <santiago@crfreenet.org>
* (c) 2009--2014 CZ.NIC z.s.p.o.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "ospf.h"
#include "nest/password.h"
const char *ospf_is_names[] = {
"Down", "Loopback", "Waiting", "PtP", "DROther", "Backup", "DR"
};
const char *ospf_ism_names[] = {
"InterfaceUp", "WaitTimer", "BackupSeen", "NeighborChange",
"LoopInd", "UnloopInd", "InterfaceDown"
};
const char *ospf_it[] = { "broadcast", "nbma", "ptp", "ptmp", "virtual link" };
static void
poll_timer_hook(timer * timer)
{
ospf_send_hello(timer->data, OHS_POLL, NULL);
}
static void
hello_timer_hook(timer * timer)
{
ospf_send_hello(timer->data, OHS_HELLO, NULL);
}
static void
wait_timer_hook(timer * timer)
{
struct ospf_iface *ifa = (struct ospf_iface *) timer->data;
struct ospf_proto *p = ifa->oa->po;
OSPF_TRACE(D_EVENTS, "Wait timer fired on %s", ifa->ifname);
ospf_iface_sm(ifa, ISM_WAITF);
}
static inline uint
ifa_tx_length(struct ospf_iface *ifa)
{
return ifa->cf->tx_length ?: ifa->iface->mtu;
}
static inline uint
ifa_tx_hdrlen(struct ospf_iface *ifa)
{
struct ospf_proto *p = ifa->oa->po;
uint hlen = ospf_is_v2(p) ? IP4_HEADER_LENGTH : IP6_HEADER_LENGTH;
/* Relevant just for OSPFv2 */
if (ifa->autype == OSPF_AUTH_CRYPT)
{
hlen += ospf_is_v2(p) ? 0 : sizeof(struct ospf_auth3);
hlen += max_mac_length(ifa->passwords);
}
return hlen;
}
static inline uint
ifa_bufsize(struct ospf_iface *ifa)
{
uint bsize = ifa->cf->rx_buffer ?: ifa->iface->mtu;
return MAX(bsize, ifa->tx_length);
}
static inline uint
ifa_flood_queue_size(struct ospf_iface *ifa)
{
return ifa->tx_length / 24;
}
int
ospf_iface_assure_bufsize(struct ospf_iface *ifa, uint plen)
{
plen += ifa->tx_hdrlen;
if (plen <= ifa->sk->tbsize)
return 0;
if (ifa->cf->rx_buffer || (plen > 0xffff))
return -1;
plen = BIRD_ALIGN(plen, 1024);
plen = MIN(plen, 0xffff);
sk_set_tbsize(ifa->sk, plen);
return 1;
}
struct nbma_node *
find_nbma_node_(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)
{
struct ospf_proto *p = ifa->oa->po;
sock *sk = sk_new(ifa->pool);
sk->type = SK_IP;
sk->subtype = ospf_is_v2(p) ? SK_IPV4 : SK_IPV6;
sk->dport = OSPF_PROTO;
sk->saddr = ifa->addr->ip;
sk->iface = ifa->iface;
sk->vrf = p->p.vrf;
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->rbsize = sk->tbsize = ifa_bufsize(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;
/* 12 is an offset of the checksum in an OSPFv3 packet */
if (ospf_is_v3(p) && !ifa->autype)
if (sk_set_ipv6_checksum(sk, 12) < 0)
goto err;
if ((ifa->type == OSPF_IT_BCAST) || (ifa->type == OSPF_IT_PTP))
{
if (ifa->cf->real_bcast)
{
ifa->all_routers = ifa->addr->brd;
ifa->des_routers = IPA_NONE;
if (sk_setup_broadcast(sk) < 0)
goto err;
}
else
{
ifa->all_routers = ospf_is_v2(p) ? IP4_OSPF_ALL_ROUTERS : IP6_OSPF_ALL_ROUTERS;
ifa->des_routers = ospf_is_v2(p) ? IP4_OSPF_DES_ROUTERS : IP6_OSPF_DES_ROUTERS;
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:
sk_log_error(sk, p->p.name);
rfree(sk);
return 0;
}
static inline void
ospf_sk_join_dr(struct ospf_iface *ifa)
{
if (ifa->sk_dr)
return;
if (sk_join_group(ifa->sk, ifa->des_routers) < 0)
sk_log_error(ifa->sk, ifa->oa->po->p.name);
ifa->sk_dr = 1;
}
static inline void
ospf_sk_leave_dr(struct ospf_iface *ifa)
{
if (!ifa->sk_dr)
return;
if (sk_leave_group(ifa->sk, ifa->des_routers) < 0)
sk_log_error(ifa->sk, ifa->oa->po->p.name);
ifa->sk_dr = 0;
}
void
ospf_open_vlink_sk(struct ospf_proto *p)
{
sock *sk = sk_new(p->p.pool);
sk->type = SK_IP;
sk->subtype = ospf_is_v2(p) ? SK_IPV4 : SK_IPV6;
sk->dport = OSPF_PROTO;
sk->vrf = p->p.vrf;
/* FIXME: configurable tos/priority ? */
sk->tos = IP_PREC_INTERNET_CONTROL;
sk->priority = sk_priority_control;
sk->err_hook = ospf_verr_hook;
sk->rbsize = 0;
sk->tbsize = ospf_is_v2(p) ? IP4_MIN_MTU : IP6_MIN_MTU;
sk->data = (void *) p;
sk->flags = 0;
if (sk_open(sk) < 0)
goto err;
/* 12 is an offset of the checksum in an OSPFv3 packet */
if (ospf_is_v3(p))
if (sk_set_ipv6_checksum(sk, 12) < 0)
goto err;
p->vlink_sk = sk;
return;
err:
sk_log_error(sk, p->p.name);
log(L_ERR "%s: Cannot open virtual link socket", p->p.name);
rfree(sk);
}
static void
ospf_iface_down(struct ospf_iface *ifa)
{
struct ospf_proto *p = ifa->oa->po;
struct ospf_neighbor *n, *nx;
struct ospf_iface *iff;
if (ifa->type != OSPF_IT_VLINK)
{
if (ospf_is_v3(ifa->oa->po))
OSPF_TRACE(D_EVENTS, "Removing interface %s (IID %d) from area %R",
ifa->ifname, ifa->instance_id, ifa->oa->areaid);
else if (ifa->addr->flags & IA_PEER)
OSPF_TRACE(D_EVENTS, "Removing interface %s (peer %I) from area %R",
ifa->ifname, ifa->addr->opposite, ifa->oa->areaid);
else
OSPF_TRACE(D_EVENTS, "Removing interface %s (%N) from area %R",
ifa->ifname, &ifa->addr->prefix, ifa->oa->areaid);
/* First of all kill all the related vlinks */
WALK_LIST(iff, p->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_neigh_sm(n, INM_KILLNBR);
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);
ospf_flush2_lsa(p, &ifa->link_lsa);
ospf_flush2_lsa(p, &ifa->net_lsa);
ospf_flush2_lsa(p, &ifa->pxn_lsa);
if (ifa->type == OSPF_IT_VLINK)
{
ifa->vifa = NULL;
ifa->addr = NULL;
ifa->cost = 0;
ifa->vip = IPA_NONE;
}
ifa->rt_pos_beg = 0;
ifa->rt_pos_end = 0;
ifa->px_pos_beg = 0;
ifa->px_pos_end = 0;
}
void
ospf_iface_remove(struct ospf_iface *ifa)
{
struct ospf_proto *p = ifa->oa->po;
int i;
if (ifa->type == OSPF_IT_VLINK)
OSPF_TRACE(D_EVENTS, "Removing vlink to %R via area %R", ifa->vid, ifa->voa->areaid);
/* Release LSAs from flood queue */
if (!ifa->stub)
for (i = 0; i < ifa->flood_queue_used; i++)
ifa->flood_queue[i]->ret_count--;
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_send_hello(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 ospf_proto *p = ifa->oa->po;
u8 oldstate = ifa->state;
if (state == oldstate)
return;
OSPF_TRACE(D_EVENTS, "Interface %s changed state from %s to %s",
ifa->ifname, ospf_is_names[oldstate], ospf_is_names[state]);
ifa->state = state;
if ((ifa->type == OSPF_IT_BCAST) && ipa_nonzero(ifa->des_routers) && 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_LOOP) && (state <= OSPF_IS_LOOP))
ospf_iface_down(ifa);
/* RFC 2328 12.4 Event 2 - iface state change */
ospf_notify_rt_lsa(ifa->oa);
/* RFC 5340 4.4.3 Event 1 - iface state change */
ospf_notify_link_lsa(ifa);
/* RFC 2328 12.4 Event 3 - iface enters/leaves DR state */
ospf_notify_net_lsa(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 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. Event is '%s'\n", ifa->ifname, ospf_ism_names[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 S);
}
}
if (ifa->hello_timer)
tm_start(ifa->hello_timer, ifa->helloint S);
if (ifa->poll_timer)
tm_start(ifa->poll_timer, ifa->pollint S);
ospf_send_hello(ifa, OHS_HELLO, NULL);
}
break;
case ISM_BACKS:
case ISM_WAITF:
if (ifa->state == OSPF_IS_WAITING)
ospf_dr_election(ifa);
break;
case ISM_NEICH:
if (ifa->state >= OSPF_IS_DROTHER)
ospf_dr_election(ifa);
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_(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_(addr->iface, addr);
}
struct ospf_iface *
ospf_iface_find(struct ospf_proto *p, struct iface *what)
{
struct ospf_iface *ifa;
WALK_LIST(ifa, p->iface_list)
if ((ifa->iface == what) && (ifa->type != OSPF_IT_VLINK))
return ifa;
return NULL;
}
static void
ospf_iface_add(struct object_lock *lock)
{
struct ospf_iface *ifa = lock->data;
struct ospf_proto *p = ifa->oa->po;
/* Open socket if interface is not stub */
if (! ifa->stub && ! ospf_sk_open(ifa))
{
log(L_ERR "%s: Cannot open socket for %s, declaring as stub", p->p.name, ifa->ifname);
ifa->ioprob = OSPF_I_SK;
ifa->stub = 1;
}
if (! ifa->stub)
{
ifa->hello_timer = tm_new_init(ifa->pool, hello_timer_hook, ifa, ifa->helloint S, 0);
if (ifa->type == OSPF_IT_NBMA)
ifa->poll_timer = tm_new_init(ifa->pool, poll_timer_hook, ifa, ifa->pollint S, 0);
if ((ifa->type == OSPF_IT_BCAST) || (ifa->type == OSPF_IT_NBMA))
ifa->wait_timer = tm_new_init(ifa->pool, wait_timer_hook, ifa, 0, 0);
ifa->flood_queue_size = ifa_flood_queue_size(ifa);
ifa->flood_queue = mb_allocz(ifa->pool, ifa->flood_queue_size * sizeof(void *));
}
/* Do iface UP, unless there is no link (then wait in LOOP state) */
if (!ifa->check_link || (ifa->iface->flags & IF_LINK_UP))
ospf_iface_sm(ifa, ISM_UP);
else
ospf_iface_chstate(ifa, OSPF_IS_LOOP);
}
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));
n->n = (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, int type)
{
/* vlink cannot be stub */
if (type == OSPF_IT_VLINK)
return 0;
/* Host address on Broadcast/NBMA */
if (((type == OSPF_IT_BCAST) || (type == OSPF_IT_NBMA)) && (addr->flags & IA_HOST))
return 1;
/* a loopback iface */
if (addr->iface->flags & IF_LOOPBACK)
return 1;
return ip->stub;
}
void
ospf_iface_new(struct ospf_area *oa, struct ifa *addr, struct ospf_iface_patt *ip)
{
struct ospf_proto *p = oa->po;
struct iface *iface = addr->iface;
struct ospf_iface *ifa;
struct pool *pool;
if (ospf_is_v3(p))
OSPF_TRACE(D_EVENTS, "Adding interface %s (IID %d) to area %R",
iface->name, ip->instance_id, oa->areaid);
else if (addr->flags & IA_PEER)
OSPF_TRACE(D_EVENTS, "Adding interface %s (peer %I) to area %R",
iface->name, addr->opposite, oa->areaid);
else
OSPF_TRACE(D_EVENTS, "Adding interface %s (%N) to area %R",
iface->name, &addr->prefix, oa->areaid);
pool = rp_new(p->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->iface_id = iface->index;
ifa->ifname = iface->name;
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->ioprob = OSPF_I_OK;
ifa->check_link = ip->check_link;
ifa->ecmp_weight = ip->ecmp_weight;
ifa->check_ttl = (ip->ttl_security == 1);
ifa->bfd = ip->bfd;
ifa->autype = ip->autype;
ifa->passwords = ip->passwords;
ifa->instance_id = ip->instance_id;
/* This must be done after relevant fields are set */
ifa->tx_length = ifa_tx_length(ifa);
ifa->tx_hdrlen = ifa_tx_hdrlen(ifa);
ifa->ptp_netmask = !(addr->flags & (IA_HOST | IA_PEER));
if (ip->ptp_netmask < 2)
ifa->ptp_netmask = ip->ptp_netmask;
/* For compatibility, we may use ptp_address even for unnumbered links */
ifa->ptp_address = !(addr->flags & (IA_HOST | IA_PEER)) || (p->gr_mode != OSPF_GR_ABLE);
if (ip->ptp_address < 2)
ifa->ptp_address = ip->ptp_address;
ifa->drip = ifa->bdrip = ospf_is_v2(p) ? IPA_NONE4 : IPA_NONE6;
ifa->type = ospf_iface_classify(ip->type, addr);
ifa->stub = ospf_iface_stubby(ip, addr, ifa->type);
/* Check validity of interface type */
int old_type = ifa->type;
u32 if_multi_flag = ip->real_bcast ? IF_BROADCAST : IF_MULTICAST;
if (ospf_is_v2(p) && (ifa->type == OSPF_IT_BCAST) && (addr->flags & IA_PEER))
ifa->type = OSPF_IT_PTP;
if (ospf_is_v2(p) && (ifa->type == OSPF_IT_NBMA) && (addr->flags & IA_PEER))
ifa->type = OSPF_IT_PTMP;
if ((ifa->type == OSPF_IT_BCAST) && !(iface->flags & if_multi_flag) && !ifa->stub)
ifa->type = OSPF_IT_NBMA;
if ((ifa->type == OSPF_IT_PTP) && !(iface->flags & if_multi_flag) && !ifa->stub)
ifa->type = OSPF_IT_PTMP;
if (ifa->type != old_type)
log(L_WARN "%s: Cannot use interface %s as %s, forcing %s",
p->p.name, iface->name, ospf_it[old_type], ospf_it[ifa->type]);
if ((ifa->type == OSPF_IT_PTP) || (ifa->type == OSPF_IT_PTMP))
ifa->link_lsa_suppression = ip->link_lsa_suppression;
ifa->state = OSPF_IS_DOWN;
init_list(&ifa->neigh_list);
init_list(&ifa->nbma_list);
struct nbma_node *nb;
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 */
if (ospf_is_v2(p) && !ospf_ipa_local(nb->ip, addr))
continue;
if (ospf_is_v3(p) && !ipa_is_link_local(nb->ip))
log(L_WARN "%s: Configured neighbor address (%I) should be link-local",
p->p.name, nb->ip);
add_nbma_node(ifa, nb, 0);
}
add_tail(&oa->po->iface_list, NODE ifa);
struct object_lock *lock = olock_new(pool);
lock->addr = ospf_is_v2(p) ? ipa_from_ip4(net4_prefix(&ifa->addr->prefix)) : IPA_NONE;
lock->type = OBJLOCK_IP;
lock->port = OSPF_PROTO;
lock->inst = ifa->instance_id;
lock->iface = iface;
lock->data = ifa;
lock->hook = ospf_iface_add;
olock_acquire(lock);
}
void
ospf_iface_new_vlink(struct ospf_proto *p, struct ospf_iface_patt *ip)
{
struct ospf_iface *ifa;
struct pool *pool;
if (!p->vlink_sk)
return;
OSPF_TRACE(D_EVENTS, "Adding vlink to %R via area %R", ip->vid, ip->voa);
/* Vlink ifname is stored just after the ospf_iface structure */
pool = rp_new(p->p.pool, "OSPF Vlink");
ifa = mb_allocz(pool, sizeof(struct ospf_iface) + 16);
ifa->oa = p->backbone;
ifa->cf = ip;
ifa->pool = pool;
/* Assign iface ID, for vlinks, this is ugly hack */
u32 vlink_id = p->last_vlink_id++;
ifa->iface_id = vlink_id + OSPF_VLINK_ID_OFFSET;
ifa->ifname = (void *) (ifa + 1);
bsprintf(ifa->ifname, "vlink%d", vlink_id);
ifa->voa = ospf_find_area(p, ip->voa);
ifa->vid = ip->vid;
ifa->sk = p->vlink_sk;
ifa->helloint = ip->helloint;
ifa->rxmtint = ip->rxmtint;
ifa->waitint = ip->waitint;
ifa->deadint = ip->deadint;
ifa->inftransdelay = ip->inftransdelay;
ifa->autype = ip->autype;
ifa->passwords = ip->passwords;
ifa->instance_id = ip->instance_id;
/* This must be done after relevant fields are set */
ifa->tx_length = ospf_is_v2(p) ? IP4_MIN_MTU : IP6_MIN_MTU;
ifa->tx_hdrlen = ifa_tx_hdrlen(ifa);
ifa->type = OSPF_IT_VLINK;
ifa->state = OSPF_IS_DOWN;
init_list(&ifa->neigh_list);
init_list(&ifa->nbma_list);
add_tail(&p->iface_list, NODE ifa);
ifa->hello_timer = tm_new_init(ifa->pool, hello_timer_hook, ifa, ifa->helloint S, 0);
ifa->flood_queue_size = ifa_flood_queue_size(ifa);
ifa->flood_queue = mb_allocz(ifa->pool, ifa->flood_queue_size * sizeof(void *));
}
static void
ospf_iface_change_timer(timer *tm, uint val)
{
if (!tm)
return;
tm->recurrent = val S;
if (tm_active(tm))
tm_start(tm, val S);
}
static inline void
ospf_iface_update_flood_queue_size(struct ospf_iface *ifa)
{
uint old_size = ifa->flood_queue_size;
uint new_size = ifa_flood_queue_size(ifa);
if (new_size <= old_size)
return;
ifa->flood_queue_size = new_size;
ifa->flood_queue = mb_realloc(ifa->flood_queue, new_size * sizeof(void *));
bzero(ifa->flood_queue + old_size, (new_size - old_size) * sizeof(void *));
}
int
ospf_iface_reconfigure(struct ospf_iface *ifa, struct ospf_iface_patt *new)
{
struct ospf_proto *p = ifa->oa->po;
struct ospf_iface_patt *old = ifa->cf;
char *ifname = ifa->ifname;
/* 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(old->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, new_type);
if (ifa->stub != new_stub)
return 0;
/* Change of these options would require to reset the iface socket */
if ((new->real_bcast != old->real_bcast) ||
(new->tx_tos != old->tx_tos) ||
(new->tx_priority != old->tx_priority) ||
(new->ttl_security != old->ttl_security))
return 0;
ifa->cf = new;
ifa->marked = 0;
/* Cancel GR peers if GR is disabled */
if (!p->gr_mode && p->gr_count)
{
struct ospf_neighbor *n, *nx;
WALK_LIST_DELSAFE(n, nx, ifa->neigh_list)
if (n->gr_active)
ospf_neigh_cancel_graceful_restart(n);
}
/* HELLO TIMER */
if (ifa->helloint != new->helloint)
{
OSPF_TRACE(D_EVENTS, "Changing hello interval of %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 of %s from %d to %d",
ifname, ifa->rxmtint, new->rxmtint);
ifa->rxmtint = new->rxmtint;
/* FIXME: Update neighbors' timers */
}
/* POLL TIMER */
if (ifa->pollint != new->pollint)
{
OSPF_TRACE(D_EVENTS, "Changing poll interval of %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 of %s from %d to %d",
ifname, ifa->waitint, new->waitint);
ifa->waitint = new->waitint;
if (ifa->wait_timer && tm_active(ifa->wait_timer))
tm_start(ifa->wait_timer, ifa->waitint S);
}
/* DEAD TIMER */
if (ifa->deadint != new->deadint)
{
OSPF_TRACE(D_EVENTS, "Changing dead interval of %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 of %s from %d to %d",
ifname, ifa->inftransdelay, new->inftransdelay);
ifa->inftransdelay = new->inftransdelay;
}
/* AUTHENTICATION */
if (ifa->autype != new->autype)
{
OSPF_TRACE(D_EVENTS, "Changing authentication type of %s", ifname);
ifa->autype = new->autype;
/* For OSPFv3, we need to update checksum calculation by OS */
if (ospf_is_v3(p) && ifa->sk)
if (sk_set_ipv6_checksum(ifa->sk, ifa->autype ? -1 : 12) < 0)
{
sk_log_error(ifa->sk, p->p.name);
return 0;
}
}
/* Update passwords */
ifa->passwords = new->passwords;
/* Update header length */
ifa->tx_hdrlen = ifa_tx_hdrlen(ifa);
/* 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 of %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 of %s from %d to %d",
ifname, ifa->priority, new->priority);
ifa->priority = new->priority;
ospf_iface_sm(ifa, ISM_NEICH);
ospf_notify_link_lsa(ifa);
}
/* STRICT NBMA */
if (ifa->strictnbma != new->strictnbma)
{
OSPF_TRACE(D_EVENTS, "Changing NBMA strictness of %s from %d to %d",
ifname, ifa->strictnbma, new->strictnbma);
ifa->strictnbma = new->strictnbma;
}
struct nbma_node *nb, *nbx;
/* NBMA LIST - remove or update old */
WALK_LIST_DELSAFE(nb, nbx, ifa->nbma_list)
{
struct nbma_node *nb2 = find_nbma_node_(&new->nbma_list, nb->ip);
if (nb2)
{
if (nb->eligible != nb2->eligible)
{
OSPF_TRACE(D_EVENTS, "Changing eligibility of NBMA neighbor %I on %s",
nb->ip, ifname);
nb->eligible = nb2->eligible;
}
}
else
{
OSPF_TRACE(D_EVENTS, "Removing NBMA neighbor %I on %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() */
if (ospf_is_v2(p) && !ospf_ipa_local(nb->ip, ifa->addr))
continue;
if (ospf_is_v3(p) && !ipa_is_link_local(nb->ip))
log(L_WARN "%s: Configured neighbor address (%I) should be link-local",
p->p.name, nb->ip);
if (! find_nbma_node(ifa, nb->ip))
{
OSPF_TRACE(D_EVENTS, "Adding NBMA neighbor %I on %s",
nb->ip, ifname);
add_nbma_node(ifa, nb, !!find_neigh_by_ip(ifa, nb->ip));
}
}
int update_buffers = 0;
/* TX LENGTH */
if (old->tx_length != new->tx_length)
{
OSPF_TRACE(D_EVENTS, "Changing TX length of %s from %d to %d",
ifname, old->tx_length, new->tx_length);
/* ifa cannot be vlink */
ifa->tx_length = ifa_tx_length(ifa);
update_buffers = 1;
if (!ifa->stub)
ospf_iface_update_flood_queue_size(ifa);
}
/* RX BUFFER */
if (old->rx_buffer != new->rx_buffer)
{
OSPF_TRACE(D_EVENTS, "Changing buffer size of %s from %d to %d",
ifname, old->rx_buffer, new->rx_buffer);
/* ifa cannot be vlink */
update_buffers = 1;
}
/* Buffer size depends on both tx_length and rx_buffer options */
if (update_buffers && ifa->sk)
{
uint bsize = ifa_bufsize(ifa);
sk_set_rbsize(ifa->sk, bsize);
sk_set_tbsize(ifa->sk, bsize);
}
/* LINK */
if (ifa->check_link != new->check_link)
{
OSPF_TRACE(D_EVENTS, "%s link check for %s",
new->check_link ? "Enabling" : "Disabling", ifname);
ifa->check_link = new->check_link;
/* ifa cannot be vlink */
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 %s from %d to %d",
ifname, (int)ifa->ecmp_weight + 1, (int)new->ecmp_weight + 1);
ifa->ecmp_weight = new->ecmp_weight;
}
/* Link LSA suppression */
if (((ifa->type == OSPF_IT_PTP) || (ifa->type == OSPF_IT_PTMP)) &&
(ifa->link_lsa_suppression != new->link_lsa_suppression))
{
OSPF_TRACE(D_EVENTS, "Changing link LSA suppression of %s from %d to %d",
ifname, ifa->link_lsa_suppression, new->link_lsa_suppression);
ifa->link_lsa_suppression = new->link_lsa_suppression;
ospf_notify_link_lsa(ifa);
}
/* PtP netmask */
int new_ptp_netmask = (new->ptp_netmask < 2) ? new->ptp_netmask :
!(ifa->addr->flags & (IA_HOST | IA_PEER));
if (ifa->ptp_netmask != new_ptp_netmask)
{
OSPF_TRACE(D_EVENTS, "Changing PtP netmask option of %s from %d to %d",
ifname, ifa->ptp_netmask, new_ptp_netmask);
ifa->ptp_netmask = new_ptp_netmask;
}
/* PtP address */
int new_ptp_address = (new->ptp_address < 2) ? new->ptp_address :
(!(ifa->addr->flags & (IA_HOST | IA_PEER)) || (p->gr_mode != OSPF_GR_ABLE));
if (ifa->ptp_address != new_ptp_address)
{
/* Keep it silent for implicit changes */
if (new->ptp_address < 2)
OSPF_TRACE(D_EVENTS, "Changing PtP address option of %s from %d to %d",
ifname, ifa->ptp_address, new_ptp_address);
ifa->ptp_address = new_ptp_address;
}
/* BFD */
if (ifa->bfd != new->bfd)
{
OSPF_TRACE(D_EVENTS, "%s BFD for %s",
new->bfd ? "Enabling" : "Disabling", ifname);
ifa->bfd = new->bfd;
struct ospf_neighbor *n;
WALK_LIST(n, ifa->neigh_list)
ospf_neigh_update_bfd(n, ifa->bfd);
}
/* instance_id is not updated - it is part of key */
return 1;
}
/*
* State for matching iface pattterns walk
*
* This is significantly different in OSPFv2 and OSPFv3.
* In OSPFv2, OSPF ifaces are created for each IP prefix (struct ifa)
* In OSPFv3, OSPF ifaces are created based on real iface (struct iface)
* We support instance_id for both OSPFv2 (RFC 6549) and OSPFv3.
*
* We process one ifa/iface and match it for all configured instance IDs. We
* maintain bitfields to track whether given instance ID was already matched.
* We have two bitfields, one global (active) and one per area (ignore), to
* detect misconfigured cases where one iface with one instance ID matches in
* multiple areas.
*/
struct ospf_mip_walk {
u32 active[8]; /* Bitfield of active instance IDs */
u32 ignore[8]; /* Bitfield of instance IDs matched in current area */
struct ospf_area *oa; /* Current area */
struct ospf_iface_patt *ip; /* Current iface pattern */
struct iface *iface; /* Specified iface (input) */
struct ifa *a; /* Specified ifa (input) */
int warn; /* Whether iface matched in multiple areas */
};
static int
ospf_walk_matching_iface_patts(struct ospf_proto *p, struct ospf_mip_walk *s)
{
int id;
if (s->ip)
goto step;
WALK_LIST(s->oa, p->area_list)
{
if (s->oa->marked)
continue;
WALK_LIST(s->ip, s->oa->ac->patt_list)
{
id = s->ip->instance_id;
if (BIT32_TEST(s->ignore, id))
continue;
if (iface_patt_match(&s->ip->i, s->iface, s->a))
{
/* Now we matched ifa/iface/instance_id for the first time in current area */
BIT32_SET(s->ignore, id);
/* If we already found it in previous areas, ignore it and add warning */
if (BIT32_TEST(s->active, id))
{ s->warn = 1; continue; }
BIT32_SET(s->active, id);
return 1;
step:
;
}
}
BIT32_ZERO(s->ignore, 256);
}
if (s->warn)
log(L_WARN "%s: Interface %s matches for multiple areas", p->p.name, s->iface->name);
return 0;
}
static struct ospf_iface *
ospf_iface_find_by_key(struct ospf_proto *p, struct ifa *a, int instance_id)
{
struct ospf_iface *ifa;
WALK_LIST(ifa, p->iface_list)
if ((ifa->addr == a) && (ifa->instance_id == instance_id) &&
(ifa->type != OSPF_IT_VLINK))
return ifa;
return NULL;
}
void
ospf_ifa_notify2(struct proto *P, uint flags, struct ifa *a)
{
struct ospf_proto *p = (struct ospf_proto *) P;
if (a->prefix.type != NET_IP4)
return;
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)
{
struct ospf_mip_walk s = { .iface = a->iface, .a = a };
while (ospf_walk_matching_iface_patts(p, &s))
ospf_iface_new(s.oa, a, s.ip);
}
if (flags & IF_CHANGE_DOWN)
{
struct ospf_iface *ifa, *ifx;
WALK_LIST_DELSAFE(ifa, ifx, p->iface_list)
if ((ifa->type != OSPF_IT_VLINK) && (ifa->addr == a))
ospf_iface_remove(ifa);
/* See a note in ospf_iface_notify() */
}
}
void
ospf_ifa_notify3(struct proto *P, uint flags, struct ifa *a)
{
struct ospf_proto *p = (struct ospf_proto *) 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 (a->prefix.type != NET_IP6)
return;
if (flags & IF_CHANGE_UP)
{
struct ospf_mip_walk s = { .iface = a->iface };
while (ospf_walk_matching_iface_patts(p, &s))
ospf_iface_new(s.oa, a, s.ip);
}
if (flags & IF_CHANGE_DOWN)
{
struct ospf_iface *ifa, *ifx;
WALK_LIST_DELSAFE(ifa, ifx, p->iface_list)
if ((ifa->addr == a) && (ifa->type != OSPF_IT_VLINK))
ospf_iface_remove(ifa);
}
}
else
{
if (a->prefix.type != ospf_get_af(p))
return;
struct ospf_iface *ifa;
WALK_LIST(ifa, p->iface_list)
if (ifa->iface == a->iface)
{
/* RFC 5340 4.4.3 Event 5 - prefix added/deleted */
ospf_notify_link_lsa(ifa);
ospf_notify_rt_lsa(ifa->oa);
}
}
}
static void
ospf_reconfigure_ifaces2(struct ospf_proto *p)
{
struct iface *iface;
struct ifa *a;
WALK_LIST(iface, iface_list)
{
if (! (iface->flags & IF_UP))
continue;
WALK_LIST(a, iface->addrs)
{
if (a->prefix.type != NET_IP4)
continue;
if (a->flags & IA_SECONDARY)
continue;
if (a->scope <= SCOPE_LINK)
continue;
struct ospf_mip_walk s = { .iface = iface, .a = a };
while (ospf_walk_matching_iface_patts(p, &s))
{
/* Main inner loop */
struct ospf_iface *ifa = ospf_iface_find_by_key(p, a, s.ip->instance_id);
if (ifa)
{
if ((ifa->oa == s.oa) && (ifa->marked < 2) &&
ospf_iface_reconfigure(ifa, s.ip))
continue;
/* Hard restart */
log(L_INFO "%s: Restarting interface %s (%N) in area %R",
p->p.name, ifa->ifname, &a->prefix, s.oa->areaid);
ospf_iface_shutdown(ifa);
ospf_iface_remove(ifa);
}
ospf_iface_new(s.oa, a, s.ip);
}
}
}
}
static void
ospf_reconfigure_ifaces3(struct ospf_proto *p)
{
struct iface *iface;
struct ifa *a;
WALK_LIST(iface, iface_list)
{
if (! (iface->flags & IF_UP))
continue;
WALK_LIST(a, iface->addrs)
{
if (a->prefix.type != NET_IP6)
continue;
if (a->flags & IA_SECONDARY)
continue;
if (a->scope != SCOPE_LINK)
continue;
struct ospf_mip_walk s = { .iface = iface };
while (ospf_walk_matching_iface_patts(p, &s))
{
/* Main inner loop */
struct ospf_iface *ifa = ospf_iface_find_by_key(p, a, s.ip->instance_id);
if (ifa)
{
if ((ifa->oa == s.oa) && (ifa->marked < 2) &&
ospf_iface_reconfigure(ifa, s.ip))
continue;
/* Hard restart */
log(L_INFO "%s: Restarting interface %s (IID %d) in area %R",
p->p.name, ifa->ifname, ifa->instance_id, s.oa->areaid);
ospf_iface_shutdown(ifa);
ospf_iface_remove(ifa);
}
ospf_iface_new(s.oa, a, s.ip);
}
}
}
}
void
ospf_reconfigure_ifaces(struct ospf_proto *p)
{
if (ospf_is_v2(p))
ospf_reconfigure_ifaces2(p);
else
ospf_reconfigure_ifaces3(p);
}
static void
ospf_iface_change_mtu(struct ospf_proto *p, struct ospf_iface *ifa)
{
/* ifa is not vlink */
OSPF_TRACE(D_EVENTS, "Interface %s changed MTU to %d",
ifa->ifname, ifa->iface->mtu);
ifa->tx_length = ifa_tx_length(ifa);
if (!ifa->sk)
return;
/* We do not shrink dynamic buffers */
uint bsize = ifa_bufsize(ifa);
if (bsize > ifa->sk->rbsize)
sk_set_rbsize(ifa->sk, bsize);
if (bsize > ifa->sk->tbsize)
sk_set_tbsize(ifa->sk, bsize);
if (!ifa->stub)
ospf_iface_update_flood_queue_size(ifa);
}
static void
ospf_iface_notify(struct ospf_proto *p, uint flags, struct ospf_iface *ifa)
{
/* ifa is not vlink */
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(p, ifa);
}
void
ospf_if_notify(struct proto *P, uint flags, struct iface *iface)
{
struct ospf_proto *p = (struct ospf_proto *) 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, p->iface_list)
if (ifa->iface == iface)
ospf_iface_notify(p, 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 %s to %R", ifa->ifname, ifa->vid);
cli_msg(-1015, "\tPeer IP: %I", ifa->vip);
cli_msg(-1015, "\tTransit area: %R (%u)", ifa->voa->areaid, ifa->voa->areaid);
}
else
{
if (ospf_is_v3(ifa->oa->po))
cli_msg(-1015, "Interface %s (IID %d)", ifa->ifname, ifa->instance_id);
else if (ifa->addr->flags & IA_PEER)
cli_msg(-1015, "Interface %s (peer %I)", ifa->ifname, ifa->addr->opposite);
else
cli_msg(-1015, "Interface %s (%N)", ifa->ifname, &ifa->addr->prefix);
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_names[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, "\tDesignated router (ID): %R", ifa->drid);
cli_msg(-1015, "\tDesignated router (IP): %I", ifa->drip);
cli_msg(-1015, "\tBackup designated router (ID): %R", ifa->bdrid);
cli_msg(-1015, "\tBackup designated router (IP): %I", ifa->bdrip);
}
}
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