Function sctp_v6src_match_nexthop

freebsd/netinet/sctp_output.c:13759–13809

#ifdef INET6
int
sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
{
	struct nd_prefix *pfx = NULL;
	struct nd_pfxrouter *pfxrtr = NULL;
	struct sockaddr_in6 gw6;

	if (ro == NULL || ro->ro_nh == NULL || src6->sin6_family != AF_INET6)
		return (0);

	/* get prefix entry of address */
	ND6_RLOCK();
	LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
		if (pfx->ndpr_stateflags & NDPRF_DETACHED)
			continue;
		if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
		    &src6->sin6_addr, &pfx->ndpr_mask))
			break;
	}
	/* no prefix entry in the prefix list */
	if (pfx == NULL) {
		ND6_RUNLOCK();
		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
		return (0);
	}

	SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);

	/* search installed gateway from prefix entry */
	LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
		memset(&gw6, 0, sizeof(struct sockaddr_in6));
		gw6.sin6_family = AF_INET6;
		gw6.sin6_len = sizeof(struct sockaddr_in6);
		memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
		    sizeof(struct in6_addr));
		SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
		SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
		if (sctp_cmpaddr((struct sockaddr *)&gw6, &ro->ro_nh->gw_sa)) {
			ND6_RUNLOCK();
			SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
			return (1);
		}
	}
	ND6_RUNLOCK();
	SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
	return (0);
}
#endif

int