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BGP: Handle case where capabilites are not used

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If peer does not announce capabilities at all, or when we have
capabilities disabled, handle that as implicit IPv4 unicast.
This commit is contained in:
Ondrej Zajicek (work) 2019-03-15 20:54:01 +01:00
parent 5d511948cd
commit 7e5f769d91
3 changed files with 14 additions and 0 deletions
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8
proto/bgp/bgp.c
View file

@ -491,6 +491,7 @@ bgp_conn_enter_openconfirm_state(struct bgp_conn *conn)
}
static const struct bgp_af_caps dummy_af_caps = { };
static const struct bgp_af_caps basic_af_caps = { .ready = 1 };
void
bgp_conn_enter_established_state(struct bgp_conn *conn)
@ -541,6 +542,13 @@ bgp_conn_enter_established_state(struct bgp_conn *conn)
const struct bgp_af_caps *loc = bgp_find_af_caps(local, c->afi);
const struct bgp_af_caps *rem = bgp_find_af_caps(peer, c->afi);
/* Use default if capabilities were not announced */
if (!local->length && (c->afi == BGP_AF_IPV4))
loc = &basic_af_caps;
if (!peer->length && (c->afi == BGP_AF_IPV4))
rem = &basic_af_caps;
/* Ignore AFIs that were not announced in multiprotocol capability */
if (!loc || !loc->ready)
loc = &dummy_af_caps;

1
proto/bgp/bgp.h
View file

@ -215,6 +215,7 @@ struct bgp_caps {
u8 llgr_aware; /* Long-lived GR capability, RFC draft */
u16 af_count; /* Number of af_data items */
u16 length; /* Length of capabilities in OPEN msg */
struct bgp_af_caps af_data[0]; /* Per-AF capability data */
};

5
proto/bgp/packets.c
View file

@ -217,6 +217,7 @@ bgp_write_capabilities(struct bgp_conn *conn, byte *buf)
struct bgp_af_caps *ac;
uint any_ext_next_hop = 0;
uint any_add_path = 0;
byte *buf_head = buf;
byte *data;
/* Prepare bgp_caps structure */
@ -394,6 +395,8 @@ bgp_write_capabilities(struct bgp_conn *conn, byte *buf)
data[-1] = buf - data;
}
caps->length = buf - buf_head;
return buf;
}
@ -405,6 +408,8 @@ bgp_read_capabilities(struct bgp_conn *conn, struct bgp_caps *caps, byte *pos, i
int i, cl;
u32 af;
caps->length += len;
while (len > 0)
{
if (len < 2 || len < (2 + pos[1]))