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BGP: Fix role check when no capability option is present

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When an OPEN message without capability options was parsed, the remote
role field was not initialized with the proper (non-zero) default value,
so it was interpreted as if 'provider' was announced.

Thanks to Mikhail Grishin for the bugreport.
This commit is contained in:
Ondrej Zajicek 2023-05-19 01:02:57 +02:00
parent b0e97617d9
commit f8ba82804f
1 changed files with 11 additions and 7 deletions
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18
proto/bgp/packets.c
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@ -215,6 +215,13 @@ bgp_af_caps_cmp(const void *X, const void *Y)
return (x->afi < y->afi) ? -1 : (x->afi > y->afi) ? 1 : 0;
}
struct bgp_caps *
bgp_alloc_capabilities(struct bgp_proto *p, int n)
{
struct bgp_caps *caps = mb_allocz(p->p.pool, sizeof(struct bgp_caps) + n * sizeof(struct bgp_af_caps));
caps->role = BGP_ROLE_UNDEFINED;
return caps;
}
void
bgp_prepare_capabilities(struct bgp_conn *conn)
@ -227,13 +234,13 @@ bgp_prepare_capabilities(struct bgp_conn *conn)
if (!p->cf->capabilities)
{
/* Just prepare empty local_caps */
conn->local_caps = mb_allocz(p->p.pool, sizeof(struct bgp_caps));
conn->local_caps = bgp_alloc_capabilities(p, 0);
return;
}
/* Prepare bgp_caps structure */
int n = list_length(&p->p.channels);
caps = mb_allocz(p->p.pool, sizeof(struct bgp_caps) + n * sizeof(struct bgp_af_caps));
caps = bgp_alloc_capabilities(p, n);
conn->local_caps = caps;
caps->as4_support = p->cf->enable_as4;
@ -464,10 +471,7 @@ bgp_read_capabilities(struct bgp_conn *conn, byte *pos, int len)
u32 af;
if (!conn->remote_caps)
{
caps = mb_allocz(p->p.pool, sizeof(struct bgp_caps) + sizeof(struct bgp_af_caps));
caps->role = BGP_ROLE_UNDEFINED;
}
caps = bgp_alloc_capabilities(p, 1);
else
{
caps = conn->remote_caps;
@ -763,7 +767,7 @@ bgp_read_options(struct bgp_conn *conn, byte *pos, uint len, uint rest)
/* Prepare empty caps if no capability option was announced */
if (!conn->remote_caps)
conn->remote_caps = mb_allocz(p->p.pool, sizeof(struct bgp_caps));
conn->remote_caps = bgp_alloc_capabilities(p, 0);
return 0;