static struct bgp_nexthop_cache *
zlookup_read_ipv6 (void)
{
struct stream *s;
uint16_t length;
u_char version, marker;
uint16_t command;
int nbytes;
struct in6_addr raddr;
uint32_t metric;
int i;
u_char nexthop_num;
struct nexthop *nexthop;
struct bgp_nexthop_cache *bnc;
s = zlookup->ibuf;
stream_reset (s);
nbytes = stream_read (s, zlookup->sock, 2);
length = stream_getw (s);
nbytes = stream_read (s, zlookup->sock, length - 2);
marker = stream_getc (s);
version = stream_getc (s);
if (version != ZSERV_VERSION || marker != ZEBRA_HEADER_MARKER)
{
zlog_err("%s: socket %d version mismatch, marker %d, version %d",
__func__, zlookup->sock, marker, version);
return NULL;
}
command = stream_getw (s);
stream_get (&raddr, s, 16);
metric = stream_getl (s);
nexthop_num = stream_getc (s);
if (nexthop_num)
{
bnc = bnc_new ();
bnc->valid = 1;
bnc->metric = metric;
bnc->nexthop_num = nexthop_num;
for (i = 0; i < nexthop_num; i++)
{
nexthop = XCALLOC (MTYPE_NEXTHOP, sizeof (struct nexthop));
nexthop->type = stream_getc (s);
switch (nexthop->type)
{
case ZEBRA_NEXTHOP_IPV6:
stream_get (&nexthop->gate.ipv6, s, 16);
break;
case ZEBRA_NEXTHOP_IPV6_IFINDEX:
case ZEBRA_NEXTHOP_IPV6_IFNAME:
stream_get (&nexthop->gate.ipv6, s, 16);
nexthop->ifindex = stream_getl (s);
break;
case ZEBRA_NEXTHOP_IFINDEX:
case ZEBRA_NEXTHOP_IFNAME:
nexthop->ifindex = stream_getl (s);
break;
default:
/* do nothing */
break;
}
bnc_nexthop_add (bnc, nexthop);
}
}
else
return NULL;
return bnc;
}
/* Check specified next-hop is reachable or not. */
static int
bgp_nexthop_lookup_ipv6 (struct peer *peer, struct bgp_info *ri, int *changed,
int *metricchanged)
{
struct bgp_node *rn;
struct prefix p;
struct bgp_nexthop_cache *bnc;
struct attr *attr;
/* If lookup is not enabled, return valid. */
if (zlookup->sock < 0)
{
if (ri->extra)
ri->extra->igpmetric = 0;
return 1;
}
/* Only check IPv6 global address only nexthop. */
attr = ri->attr;
if (attr->extra->mp_nexthop_len != 16
|| IN6_IS_ADDR_LINKLOCAL (&attr->extra->mp_nexthop_global))
return 1;
memset (&p, 0, sizeof (struct prefix));
p.family = AF_INET6;
p.prefixlen = IPV6_MAX_BITLEN;
p.u.prefix6 = attr->extra->mp_nexthop_global;
/* IBGP or ebgp-multihop */
rn = bgp_node_get (bgp_nexthop_cache_table[AFI_IP6], &p);
if (rn->info)
{
bnc = rn->info;
bgp_unlock_node (rn);
}
else
{
if (NULL == (bnc = zlookup_query_ipv6 (&attr->extra->mp_nexthop_global)))
bnc = bnc_new ();
else
{
if (changed)
{
struct bgp_table *old;
struct bgp_node *oldrn;
if (bgp_nexthop_cache_table[AFI_IP6] == cache1_table[AFI_IP6])
old = cache2_table[AFI_IP6];
else
old = cache1_table[AFI_IP6];
oldrn = bgp_node_lookup (old, &p);
if (oldrn)
{
struct bgp_nexthop_cache *oldbnc = oldrn->info;
bnc->changed = bgp_nexthop_cache_different (bnc, oldbnc);
if (bnc->metric != oldbnc->metric)
bnc->metricchanged = 1;
bgp_unlock_node (oldrn);
}
}
}
rn->info = bnc;
}
if (changed)
*changed = bnc->changed;
if (metricchanged)
*metricchanged = bnc->metricchanged;
if (bnc->valid && bnc->metric)
(bgp_info_extra_get (ri))->igpmetric = bnc->metric;
else if (ri->extra)
ri->extra->igpmetric = 0;
return bnc->valid;
}
/* Check specified next-hop is reachable or not. */
int
bgp_nexthop_lookup (afi_t afi, struct peer *peer, struct bgp_info *ri,
int *changed, int *metricchanged)
{
struct bgp_node *rn;
struct prefix p;
struct bgp_nexthop_cache *bnc;
struct in_addr addr;
/* If lookup is not enabled, return valid. */
if (zlookup->sock < 0)
{
if (ri->extra)
ri->extra->igpmetric = 0;
return 1;
}
#ifdef HAVE_IPV6
if (afi == AFI_IP6)
return bgp_nexthop_lookup_ipv6 (peer, ri, changed, metricchanged);
#endif /* HAVE_IPV6 */
addr = ri->attr->nexthop;
memset (&p, 0, sizeof (struct prefix));
p.family = AF_INET;
p.prefixlen = IPV4_MAX_BITLEN;
p.u.prefix4 = addr;
/* IBGP or ebgp-multihop */
rn = bgp_node_get (bgp_nexthop_cache_table[AFI_IP], &p);
if (rn->info)
{
bnc = rn->info;
bgp_unlock_node (rn);
}
else
{
if (NULL == (bnc = zlookup_query (addr)))
bnc = bnc_new ();
else
{
if (changed)
{
struct bgp_table *old;
struct bgp_node *oldrn;
if (bgp_nexthop_cache_table[AFI_IP] == cache1_table[AFI_IP])
old = cache2_table[AFI_IP];
else
old = cache1_table[AFI_IP];
oldrn = bgp_node_lookup (old, &p);
if (oldrn)
{
struct bgp_nexthop_cache *oldbnc = oldrn->info;
bnc->changed = bgp_nexthop_cache_different (bnc, oldbnc);
if (bnc->metric != oldbnc->metric)
bnc->metricchanged = 1;
bgp_unlock_node (oldrn);
}
}
}
rn->info = bnc;
}
if (changed)
*changed = bnc->changed;
if (metricchanged)
*metricchanged = bnc->metricchanged;
if (bnc->valid && bnc->metric)
(bgp_info_extra_get(ri))->igpmetric = bnc->metric;
else if (ri->extra)
ri->extra->igpmetric = 0;
return bnc->valid;
}
static struct bgp_nexthop_cache *
zlookup_read (void)
{
struct stream *s;
uint16_t length;
u_char marker;
u_char version;
uint16_t command __attribute__((unused));
int nbytes __attribute__((unused));
struct in_addr raddr __attribute__((unused));
uint32_t metric;
int i;
u_char nexthop_num;
struct nexthop *nexthop;
struct bgp_nexthop_cache *bnc;
s = zlookup->ibuf;
stream_reset (s);
/* nbytes not being checked */
nbytes = stream_read (s, zlookup->sock, 2);
length = stream_getw (s);
nbytes = stream_read (s, zlookup->sock, length - 2);
marker = stream_getc (s);
version = stream_getc (s);
if (version != ZSERV_VERSION || marker != ZEBRA_HEADER_MARKER)
{
zlog_err("%s: socket %d version mismatch, marker %d, version %d",
__func__, zlookup->sock, marker, version);
return NULL;
}
/* XXX: not checking command */
command = stream_getw (s);
/* XXX: not doing anything with raddr */
raddr.s_addr = stream_get_ipv4 (s);
metric = stream_getl (s);
nexthop_num = stream_getc (s);
if (nexthop_num)
{
bnc = bnc_new ();
bnc->valid = 1;
bnc->metric = metric;
bnc->nexthop_num = nexthop_num;
for (i = 0; i < nexthop_num; i++)
{
nexthop = XCALLOC (MTYPE_NEXTHOP, sizeof (struct nexthop));
nexthop->type = stream_getc (s);
switch (nexthop->type)
{
case ZEBRA_NEXTHOP_IPV4:
nexthop->gate.ipv4.s_addr = stream_get_ipv4 (s);
break;
case ZEBRA_NEXTHOP_IPV4_IFINDEX:
nexthop->gate.ipv4.s_addr = stream_get_ipv4 (s);
nexthop->ifindex = stream_getl (s);
break;
case ZEBRA_NEXTHOP_IFINDEX:
case ZEBRA_NEXTHOP_IFNAME:
nexthop->ifindex = stream_getl (s);
break;
default:
/* do nothing */
break;
}
bnc_nexthop_add (bnc, nexthop);
}
}
else
return NULL;
return bnc;
}
