BGP: Handle missing NEXT_HOP attribute properly (9c9050ff) · Commits · 戴 / Bird

proto/bgp/attrs.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1109,6 +1109,9 @@ bgp_decode_attrs(struct bgp_parse_state s, byte data, uint len)
		if (!BIT32_TEST(s->attrs_seen, BA_AS_PATH))
		{ REPORT(NO_MANDATORY, "AS_PATH"); goto withdraw; }

		if (s->ip_reach_len && !BIT32_TEST(s->attrs_seen, BA_NEXT_HOP))
		{ REPORT(NO_MANDATORY, "NEXT_HOP"); goto withdraw; }

		/* When receiving attributes from non-AS4-aware BGP speaker, we have to
		reconstruct AS_PATH and AGGREGATOR attributes; RFC 6793 4.2.3 */
		if (!p->as4_session)