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|
/* $OpenBSD: rde_lsdb.c,v 1.9 2007/12/13 08:54:05 claudio Exp $ */
/*
* Copyright (c) 2004, 2005 Claudio Jeker <claudio@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/tree.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ospf6.h"
#include "ospf6d.h"
#include "rde.h"
#include "log.h"
struct vertex *vertex_get(struct lsa *, struct rde_nbr *);
int lsa_link_check(struct lsa *, u_int16_t);
int lsa_intra_a_pref_check(struct lsa *, u_int16_t);
void lsa_timeout(int, short, void *);
void lsa_refresh(struct vertex *);
int lsa_equal(struct lsa *, struct lsa *);
int lsa_get_prefix(void *, u_int16_t, struct lsa_prefix *);
RB_GENERATE(lsa_tree, vertex, entry, lsa_compare)
extern struct ospfd_conf *rdeconf;
void
lsa_init(struct lsa_tree *t)
{
RB_INIT(t);
}
int
lsa_compare(struct vertex *a, struct vertex *b)
{
if (a->type < b->type)
return (-1);
if (a->type > b->type)
return (1);
if (a->ls_id < b->ls_id)
return (-1);
if (a->ls_id > b->ls_id)
return (1);
if (a->adv_rtr < b->adv_rtr)
return (-1);
if (a->adv_rtr > b->adv_rtr)
return (1);
return (0);
}
struct vertex *
vertex_get(struct lsa *lsa, struct rde_nbr *nbr)
{
struct vertex *v;
struct timespec tp;
if ((v = calloc(1, sizeof(struct vertex))) == NULL)
fatal(NULL);
TAILQ_INIT(&v->nexthop);
v->area = nbr->area;
v->peerid = nbr->peerid;
v->lsa = lsa;
clock_gettime(CLOCK_MONOTONIC, &tp);
v->changed = v->stamp = tp.tv_sec;
v->cost = LS_INFINITY;
v->ls_id = ntohl(lsa->hdr.ls_id);
v->adv_rtr = ntohl(lsa->hdr.adv_rtr);
v->type = ntohs(lsa->hdr.type);
if (!nbr->self)
v->flooded = 1; /* XXX fix me */
v->self = nbr->self;
evtimer_set(&v->ev, lsa_timeout, v);
return (v);
}
void
vertex_free(struct vertex *v)
{
if (v->type == LSA_TYPE_EXTERNAL)
RB_REMOVE(lsa_tree, &asext_tree, v);
else
RB_REMOVE(lsa_tree, &v->area->lsa_tree, v);
(void)evtimer_del(&v->ev);
free(v->lsa);
free(v);
}
/* returns -1 if a is older, 1 if newer and 0 if equal to b */
int
lsa_newer(struct lsa_hdr *a, struct lsa_hdr *b)
{
int32_t a32, b32;
u_int16_t a16, b16;
int i;
if (a == NULL)
return (-1);
if (b == NULL)
return (1);
/*
* The sequence number is defined as signed 32-bit integer,
* no idea how IETF came up with such a stupid idea.
*/
a32 = (int32_t)ntohl(a->seq_num);
b32 = (int32_t)ntohl(b->seq_num);
if (a32 > b32)
return (1);
if (a32 < b32)
return (-1);
a16 = ntohs(a->ls_chksum);
b16 = ntohs(b->ls_chksum);
if (a16 > b16)
return (1);
if (a16 < b16)
return (-1);
a16 = ntohs(a->age);
b16 = ntohs(b->age);
if (a16 >= MAX_AGE && b16 >= MAX_AGE)
return (0);
if (b16 >= MAX_AGE)
return (-1);
if (a16 >= MAX_AGE)
return (1);
i = b16 - a16;
if (abs(i) > MAX_AGE_DIFF)
return (i > 0 ? 1 : -1);
return (0);
}
int
lsa_check(struct rde_nbr *nbr, struct lsa *lsa, u_int16_t len)
{
u_int32_t metric;
if (len < sizeof(lsa->hdr)) {
log_warnx("lsa_check: bad packet size");
return (0);
}
if (ntohs(lsa->hdr.len) != len) {
log_warnx("lsa_check: bad packet size");
return (0);
}
if (iso_cksum(lsa, len, 0)) {
log_warnx("lsa_check: bad packet checksum");
return (0);
}
/* invalid ages */
if ((ntohs(lsa->hdr.age) < 1 && !nbr->self) ||
ntohs(lsa->hdr.age) > MAX_AGE) {
log_warnx("lsa_check: bad age");
return (0);
}
/* invalid sequence number */
if (ntohl(lsa->hdr.seq_num) == RESV_SEQ_NUM) {
log_warnx("ls_check: bad seq num");
return (0);
}
switch (ntohs(lsa->hdr.type)) {
case LSA_TYPE_LINK:
if (!lsa_link_check(lsa, len))
return (0);
break;
case LSA_TYPE_ROUTER:
if (len < sizeof(lsa->hdr) + sizeof(struct lsa_rtr)) {
log_warnx("lsa_check: bad LSA rtr packet");
return (0);
}
len -= sizeof(lsa->hdr) + sizeof(struct lsa_rtr);
if (len % sizeof(struct lsa_rtr_link)) {
log_warnx("lsa_check: bad LSA rtr packet");
return (0);
}
break;
case LSA_TYPE_NETWORK:
if ((len % sizeof(u_int32_t)) ||
len < sizeof(lsa->hdr) + sizeof(u_int32_t)) {
return (0);
}
break;
case LSA_TYPE_INTER_A_PREFIX:
if (len < sizeof(lsa->hdr) + sizeof(lsa->data.pref_sum)) {
log_warnx("lsa_check: bad LSA prefix summary packet");
return (0);
}
metric = ntohl(lsa->data.pref_sum.metric);
if (metric & ~LSA_METRIC_MASK) {
log_warnx("lsa_check: bad LSA summary metric");
return (0);
}
if (lsa_get_prefix(((char *)lsa) + sizeof(lsa->hdr) +
sizeof(lsa->data.pref_sum),
len - sizeof(lsa->hdr) + sizeof(lsa->data.pref_sum),
NULL) == -1) {
log_warnx("lsa_check: "
"invalid LSA prefix summary packet");
return (0);
}
break;
case LSA_TYPE_INTER_A_ROUTER:
if (len < sizeof(lsa->hdr) + sizeof(lsa->data.rtr_sum)) {
log_warnx("lsa_check: bad LSA router summary packet");
return (0);
}
metric = ntohl(lsa->data.rtr_sum.metric);
if (metric & ~LSA_METRIC_MASK) {
log_warnx("lsa_check: bad LSA summary metric");
return (0);
}
break;
case LSA_TYPE_INTRA_A_PREFIX:
if (!lsa_intra_a_pref_check(lsa, len))
return (0);
break;
case LSA_TYPE_EXTERNAL:
if ((len % (3 * sizeof(u_int32_t))) ||
len < sizeof(lsa->hdr) + sizeof(lsa->data.asext)) {
log_warnx("lsa_check: bad LSA as-external packet");
return (0);
}
metric = ntohl(lsa->data.asext.metric);
if (metric & ~(LSA_METRIC_MASK | LSA_ASEXT_E_FLAG)) {
log_warnx("lsa_check: bad LSA as-external metric");
return (0);
}
/* AS-external-LSA are silently discarded in stub areas */
if (nbr->area->stub)
return (0);
break;
default:
log_warnx("lsa_check: unknown type %x", ntohs(lsa->hdr.type));
return (0);
}
/* MaxAge handling */
if (lsa->hdr.age == htons(MAX_AGE) && !nbr->self && lsa_find(nbr->iface,
lsa->hdr.type, lsa->hdr.ls_id, lsa->hdr.adv_rtr) == NULL &&
!rde_nbr_loading(nbr->area)) {
/*
* if no neighbor in state Exchange or Loading
* ack LSA but don't add it. Needs to be a direct ack.
*/
rde_imsg_compose_ospfe(IMSG_LS_ACK, nbr->peerid, 0, &lsa->hdr,
sizeof(struct lsa_hdr));
return (0);
}
return (1);
}
int
lsa_link_check(struct lsa *lsa, u_int16_t len)
{
char *buf = (char *)lsa;
struct lsa_link *llink;
u_int32_t i, off, npref;
int rv;
llink = (struct lsa_link *)(buf + sizeof(lsa->hdr));
off = sizeof(lsa->hdr) + sizeof(struct lsa_link);
if (off > len) {
log_warnx("lsa_link_check: invalid LSA link packet, "
"short header");
return (0);
}
len -= off;
npref = ntohl(llink->numprefix);
for (i = 0; i < npref; i++) {
rv = lsa_get_prefix(buf + off, len, NULL);
if (rv == -1) {
log_warnx("lsa_link_check: invalid LSA link packet");
return (0);
}
off += rv;
len -= rv;
}
return (1);
}
int
lsa_intra_a_pref_check(struct lsa *lsa, u_int16_t len)
{
char *buf = (char *)lsa;
struct lsa_intra_prefix *iap;
u_int32_t i, off, npref;
int rv;
iap = (struct lsa_intra_prefix *)(buf + sizeof(lsa->hdr));
off = sizeof(lsa->hdr) + sizeof(struct lsa_intra_prefix);
if (off > len) {
log_warnx("lsa_intra_a_pref_check: "
"invalid LSA intra area prefix packet, short header");
return (0);
}
len -= off;
npref = ntohl(iap->numprefix);
for (i = 0; i < npref; i++) {
rv = lsa_get_prefix(buf + off, len, NULL);
if (rv == -1) {
log_warnx("lsa_intra_a_pref_check: "
"invalid LSA intra area prefix packet");
return (0);
}
off += rv;
len -= rv;
}
return (1);
}
int
lsa_self(struct rde_nbr *nbr, struct lsa *new, struct vertex *v)
{
#if 0
struct lsa *dummy;
struct iface *iface;
if (nbr->self)
return (0);
if (rde_router_id() == new->hdr.adv_rtr)
goto self;
if (ntohs(new->hdr.type) == LSA_TYPE_NETWORK)
LIST_FOREACH(iface, &nbr->area->iface_list, entry)
if (iface->addr.s_addr == new->hdr.ls_id)
goto self;
return (0);
self:
if (v == NULL) {
/*
* LSA is no longer announced, remove by premature aging.
* The problem is that new may not be altered so a copy
* needs to be added to the LSA DB first.
*/
if ((dummy = malloc(ntohs(new->hdr.len))) == NULL)
fatal("lsa_self");
memcpy(dummy, new, ntohs(new->hdr.len));
dummy->hdr.age = htons(MAX_AGE);
/*
* The clue is that by using the remote nbr as originator
* the dummy LSA will be reflooded via the default timeout
* handler.
*/
(void)lsa_add(rde_nbr_self(nbr->area), dummy);
return (1);
}
/*
* LSA is still originated, just reflood it. But we need to create
* a new instance by setting the LSA sequence number equal to the
* one of new and calling lsa_refresh(). Flooding will be done by the
* caller.
*/
v->lsa->hdr.seq_num = new->hdr.seq_num;
lsa_refresh(v);
return (1);
#endif
return (0);
}
int
lsa_add(struct rde_nbr *nbr, struct lsa *lsa)
{
struct lsa_tree *tree;
struct vertex *new, *old;
struct timeval tv, now, res;
if (LSA_IS_SCOPE_AS(ntohs(lsa->hdr.type)))
tree = &asext_tree;
else if (LSA_IS_SCOPE_AREA(ntohs(lsa->hdr.type)))
tree = &nbr->area->lsa_tree;
else if (LSA_IS_SCOPE_LLOCAL(ntohs(lsa->hdr.type)))
tree = &nbr->iface->lsa_tree;
else
fatalx("unknown scope type");
new = vertex_get(lsa, nbr);
old = RB_INSERT(lsa_tree, tree, new);
if (old != NULL) {
if (old->deleted && evtimer_pending(&old->ev, &tv)) {
/* new update added before hold time expired */
gettimeofday(&now, NULL);
timersub(&tv, &now, &res);
/* remove old LSA and insert new LSA with delay */
vertex_free(old);
RB_INSERT(lsa_tree, tree, new);
new->deleted = 1;
if (evtimer_add(&new->ev, &res) != 0)
fatal("lsa_add");
return (1);
}
if (!lsa_equal(new->lsa, old->lsa)) {
if (ntohs(lsa->hdr.type) != LSA_TYPE_EXTERNAL)
nbr->area->dirty = 1;
start_spf_timer();
}
vertex_free(old);
RB_INSERT(lsa_tree, tree, new);
} else {
if (ntohs(lsa->hdr.type) != LSA_TYPE_EXTERNAL)
nbr->area->dirty = 1;
start_spf_timer();
}
/* timeout handling either MAX_AGE or LS_REFRESH_TIME */
timerclear(&tv);
if (nbr->self && ntohs(new->lsa->hdr.age) == DEFAULT_AGE)
tv.tv_sec = LS_REFRESH_TIME;
else
tv.tv_sec = MAX_AGE - ntohs(new->lsa->hdr.age);
if (evtimer_add(&new->ev, &tv) != 0)
fatal("lsa_add");
return (0);
}
void
lsa_del(struct rde_nbr *nbr, struct lsa_hdr *lsa)
{
struct vertex *v;
struct timeval tv;
v = lsa_find(nbr->iface, lsa->type, lsa->ls_id, lsa->adv_rtr);
if (v == NULL)
return;
v->deleted = 1;
/* hold time to make sure that a new lsa is not added premature */
timerclear(&tv);
tv.tv_sec = MIN_LS_INTERVAL;
if (evtimer_add(&v->ev, &tv) == -1)
fatal("lsa_del");
}
void
lsa_age(struct vertex *v)
{
struct timespec tp;
time_t now;
int d;
u_int16_t age;
clock_gettime(CLOCK_MONOTONIC, &tp);
now = tp.tv_sec;
d = now - v->stamp;
/* set stamp so that at least new calls work */
v->stamp = now;
if (d < 0) {
log_warnx("lsa_age: time went backwards");
return;
}
age = ntohs(v->lsa->hdr.age);
if (age + d > MAX_AGE)
age = MAX_AGE;
else
age += d;
v->lsa->hdr.age = htons(age);
}
struct vertex *
lsa_find(struct iface *iface, u_int16_t type, u_int32_t ls_id,
u_int32_t adv_rtr)
{
struct vertex key;
struct vertex *v;
struct lsa_tree *tree;
key.ls_id = ntohl(ls_id);
key.adv_rtr = ntohl(adv_rtr);
key.type = ntohs(type);
if (LSA_IS_SCOPE_AS(key.type))
tree = &asext_tree;
else if (LSA_IS_SCOPE_AREA(key.type)) {
struct area *area;
if ((area = area_find(rdeconf, iface->area_id)) == NULL)
fatalx("interface lost area");
tree = &area->lsa_tree;
} else if (LSA_IS_SCOPE_LLOCAL(key.type))
tree = &iface->lsa_tree;
else
fatalx("unknown scope type");
v = RB_FIND(lsa_tree, tree, &key);
/* LSA that are deleted are not findable */
if (v && v->deleted)
return (NULL);
if (v)
lsa_age(v);
return (v);
}
struct vertex *
lsa_find_net(struct area *area, u_int32_t ls_id)
{
struct lsa_tree *tree = &area->lsa_tree;
struct vertex *v;
/* XXX speed me up */
RB_FOREACH(v, lsa_tree, tree) {
if (v->lsa->hdr.type == LSA_TYPE_NETWORK &&
v->lsa->hdr.ls_id == ls_id) {
/* LSA that are deleted are not findable */
if (v->deleted)
return (NULL);
lsa_age(v);
return (v);
}
}
return (NULL);
}
u_int16_t
lsa_num_links(struct vertex *v)
{
switch (v->type) {
case LSA_TYPE_ROUTER:
return ((ntohs(v->lsa->hdr.len) - sizeof(struct lsa_hdr)
- sizeof(u_int32_t)) / sizeof(struct lsa_rtr_link));
case LSA_TYPE_NETWORK:
return ((ntohs(v->lsa->hdr.len) - sizeof(struct lsa_hdr)
- sizeof(u_int32_t)) / sizeof(struct lsa_net_link));
default:
fatalx("lsa_num_links: invalid LSA type");
}
return (0);
}
void
lsa_snap(struct area *area, u_int32_t peerid)
{
struct lsa_tree *tree = &area->lsa_tree;
struct vertex *v;
do {
RB_FOREACH(v, lsa_tree, tree) {
if (v->deleted)
continue;
lsa_age(v);
if (ntohs(v->lsa->hdr.age) >= MAX_AGE) {
rde_imsg_compose_ospfe(IMSG_LS_UPD, peerid,
0, &v->lsa->hdr, ntohs(v->lsa->hdr.len));
} else {
rde_imsg_compose_ospfe(IMSG_DB_SNAPSHOT, peerid,
0, &v->lsa->hdr, sizeof(struct lsa_hdr));
}
}
if (tree != &area->lsa_tree)
break;
tree = &asext_tree;
} while (1);
}
void
lsa_dump(struct lsa_tree *tree, int imsg_type, pid_t pid)
{
struct vertex *v;
RB_FOREACH(v, lsa_tree, tree) {
if (v->deleted)
continue;
lsa_age(v);
switch (imsg_type) {
case IMSG_CTL_SHOW_DATABASE:
rde_imsg_compose_ospfe(IMSG_CTL_SHOW_DATABASE, 0, pid,
&v->lsa->hdr, ntohs(v->lsa->hdr.len));
continue;
case IMSG_CTL_SHOW_DB_SELF:
if (v->lsa->hdr.adv_rtr == rde_router_id())
break;
continue;
case IMSG_CTL_SHOW_DB_EXT:
if (v->type == LSA_TYPE_EXTERNAL)
break;
continue;
case IMSG_CTL_SHOW_DB_NET:
if (v->type == LSA_TYPE_NETWORK)
break;
continue;
case IMSG_CTL_SHOW_DB_RTR:
if (v->type == LSA_TYPE_ROUTER)
break;
continue;
case IMSG_CTL_SHOW_DB_SUM:
if (v->type == LSA_TYPE_INTER_A_PREFIX)
break;
continue;
case IMSG_CTL_SHOW_DB_ASBR:
if (v->type == LSA_TYPE_INTER_A_ROUTER)
break;
continue;
default:
log_warnx("lsa_dump: unknown imsg type");
return;
}
rde_imsg_compose_ospfe(imsg_type, 0, pid, &v->lsa->hdr,
ntohs(v->lsa->hdr.len));
}
}
/* ARGSUSED */
void
lsa_timeout(int fd, short event, void *bula)
{
struct vertex *v = bula;
struct timeval tv;
lsa_age(v);
if (v->deleted) {
if (ntohs(v->lsa->hdr.age) >= MAX_AGE) {
vertex_free(v);
} else {
v->deleted = 0;
/* schedule recalculation of the RIB */
if (v->lsa->hdr.type != LSA_TYPE_EXTERNAL)
v->area->dirty = 1;
start_spf_timer();
rde_imsg_compose_ospfe(IMSG_LS_FLOOD, v->peerid, 0,
v->lsa, ntohs(v->lsa->hdr.len));
/* timeout handling either MAX_AGE or LS_REFRESH_TIME */
timerclear(&tv);
if (v->self)
tv.tv_sec = LS_REFRESH_TIME;
else
tv.tv_sec = MAX_AGE - ntohs(v->lsa->hdr.age);
if (evtimer_add(&v->ev, &tv) != 0)
fatal("lsa_add");
}
return;
}
if (v->self && ntohs(v->lsa->hdr.age) < MAX_AGE)
lsa_refresh(v);
rde_imsg_compose_ospfe(IMSG_LS_FLOOD, v->peerid, 0,
v->lsa, ntohs(v->lsa->hdr.len));
}
void
lsa_refresh(struct vertex *v)
{
struct timeval tv;
struct timespec tp;
u_int32_t seqnum;
u_int16_t len;
/* refresh LSA by increasing sequence number by one */
v->lsa->hdr.age = htons(DEFAULT_AGE);
seqnum = ntohl(v->lsa->hdr.seq_num);
if (seqnum++ == MAX_SEQ_NUM)
/* XXX fix me */
fatalx("sequence number wrapping");
v->lsa->hdr.seq_num = htonl(seqnum);
/* recalculate checksum */
len = ntohs(v->lsa->hdr.len);
v->lsa->hdr.ls_chksum = 0;
v->lsa->hdr.ls_chksum = htons(iso_cksum(v->lsa, len, LS_CKSUM_OFFSET));
clock_gettime(CLOCK_MONOTONIC, &tp);
v->changed = v->stamp = tp.tv_sec;
timerclear(&tv);
tv.tv_sec = LS_REFRESH_TIME;
if (evtimer_add(&v->ev, &tv) == -1)
fatal("lsa_refresh");
}
void
lsa_merge(struct rde_nbr *nbr, struct lsa *lsa, struct vertex *v)
{
struct timeval tv;
struct timespec tp;
time_t now;
u_int16_t len;
if (v == NULL) {
if (lsa_add(nbr, lsa))
/* delayed update */
return;
rde_imsg_compose_ospfe(IMSG_LS_FLOOD, nbr->peerid, 0,
lsa, ntohs(lsa->hdr.len));
return;
}
/* set the seq_num to the current one. lsa_refresh() will do the ++ */
lsa->hdr.seq_num = v->lsa->hdr.seq_num;
/* recalculate checksum */
len = ntohs(lsa->hdr.len);
lsa->hdr.ls_chksum = 0;
lsa->hdr.ls_chksum = htons(iso_cksum(lsa, len, LS_CKSUM_OFFSET));
/* compare LSA most header fields are equal so don't check them */
if (lsa_equal(lsa, v->lsa)) {
free(lsa);
return;
}
/* overwrite the lsa all other fields are unaffected */
free(v->lsa);
v->lsa = lsa;
start_spf_timer();
if (v->type != LSA_TYPE_EXTERNAL)
nbr->area->dirty = 1;
/* set correct timeout for reflooding the LSA */
clock_gettime(CLOCK_MONOTONIC, &tp);
now = tp.tv_sec;
timerclear(&tv);
if (v->changed + MIN_LS_INTERVAL >= now)
tv.tv_sec = MIN_LS_INTERVAL;
if (evtimer_add(&v->ev, &tv) == -1)
fatal("lsa_merge");
}
void
lsa_remove_invalid_sums(struct area *area)
{
struct lsa_tree *tree = &area->lsa_tree;
struct vertex *v, *nv;
/* XXX speed me up */
for (v = RB_MIN(lsa_tree, tree); v != NULL; v = nv) {
nv = RB_NEXT(lsa_tree, tree, v);
if ((v->type == LSA_TYPE_INTER_A_PREFIX ||
v->type == LSA_TYPE_INTER_A_ROUTER) &&
v->self && v->cost == LS_INFINITY &&
v->deleted == 0) {
/*
* age the lsa and call lsa_timeout() which will
* actually remove it from the database.
*/
v->lsa->hdr.age = htons(MAX_AGE);
lsa_timeout(0, 0, v);
}
}
}
int
lsa_equal(struct lsa *a, struct lsa *b)
{
/*
* compare LSA that already have same type, adv_rtr and ls_id
* so not all header need to be compared
*/
if (a == NULL || b == NULL)
return (0);
if (a->hdr.len != b->hdr.len)
return (0);
/* LSA with age MAX_AGE are never equal */
if (a->hdr.age == htons(MAX_AGE) || b->hdr.age == htons(MAX_AGE))
return (0);
if (memcmp(&a->data, &b->data, ntohs(a->hdr.len) -
sizeof(struct lsa_hdr)))
return (0);
return (1);
}
int
lsa_get_prefix(void *buf, u_int16_t len, struct lsa_prefix *p)
{
u_int32_t *buf32 = buf;
u_int32_t *addr = NULL;
u_int8_t prefixlen;
if (len < sizeof(u_int32_t))
return (-1);
prefixlen = ntohl(*buf32) >> 24;
if (p) {
bzero(p, sizeof(*p));
p->prefixlen = prefixlen;
p->options = (ntohl(*buf32) >> 16) & 0xff;
p->metric = *buf32 & 0xffff;
addr = (u_int32_t *)&p->prefix;
}
buf32++;
len -= sizeof(u_int32_t);
for (; ((prefixlen + 31) / 32) > 0; prefixlen -= 32) {
if (len < sizeof(u_int32_t))
return (-1);
if (addr)
*addr++ = *buf32++;
len -= sizeof(u_int32_t);
}
return (len);
}
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