diff options
| author | Ondrej Zajicek (work) <santiago@crfreenet.org> | 2021-12-20 20:25:35 +0100 |
|---|---|---|
| committer | Ondrej Zajicek (work) <santiago@crfreenet.org> | 2022-02-06 23:27:13 +0100 |
| commit | 1f2eb2aca8e348fefc1822ec2adcad0cc97768d8 (patch) | |
| tree | 11494fc2f2dbc8b7aeb2a4a172fec6d2263af4ab /proto/bgp/attrs.c | |
| parent | 1ae42e522374ae60c23fe4c419c62b2209fbeea8 (diff) | |
BGP: Implement flowspec validation procedure
Implement flowspec validation procedure as described in RFC 8955 sec. 6
and RFC 9117. The Validation procedure enforces that only routers in the
forwarding path for a network can originate flowspec rules for that
network.
The patch adds new mechanism for tracking inter-table dependencies, which
is necessary as the flowspec validation depends on IP routes, and flowspec
rules must be revalidated when best IP routes change.
The validation procedure is disabled by default and requires that
relevant IP table uses trie, as it uses interval queries for subnets.
Diffstat (limited to 'proto/bgp/attrs.c')
| -rw-r--r-- | proto/bgp/attrs.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/proto/bgp/attrs.c b/proto/bgp/attrs.c index 24ba00ba..b28cbd55 100644 --- a/proto/bgp/attrs.c +++ b/proto/bgp/attrs.c @@ -1676,6 +1676,10 @@ bgp_preexport(struct proto *P, rte **new, struct linpool *pool UNUSED) if (src == NULL) return 0; + /* Reject flowspec that failed validation */ + if ((e->attrs->dest == RTD_UNREACHABLE) && net_is_flow(e->net->n.addr)) + return -1; + /* IBGP route reflection, RFC 4456 */ if (p->is_internal && src->is_internal && (p->local_as == src->local_as)) { |