Function in6_gre_udp_input

freebsd/netinet6/ip6_gre.c:215–257

}

static void
in6_gre_udp_input(struct mbuf *m, int off, struct inpcb *inp,
    const struct sockaddr *sa, void *ctx)
{
	struct epoch_tracker et;
	struct gre_socket *gs;
	struct gre_softc *sc;
	struct sockaddr_in6 dst;

	NET_EPOCH_ENTER(et);
	/*
	 * udp_append() holds reference to inp, it is safe to check
	 * inp_flags2 without INP_RLOCK().
	 * If socket was closed before we have entered NET_EPOCH section,
	 * INP_FREED flag should be set. Otherwise it should be safe to
	 * make access to ctx data, because gre_so will be freed by
	 * gre_sofree() via NET_EPOCH_CALL().
	 */
	if (__predict_false(inp->inp_flags2 & INP_FREED)) {
		NET_EPOCH_EXIT(et);
		m_freem(m);
		return;
	}

	gs = (struct gre_socket *)ctx;
	dst = *(const struct sockaddr_in6 *)sa;
	if (sa6_embedscope(&dst, 0)) {
		NET_EPOCH_EXIT(et);
		m_freem(m);
		return;
	}
	CK_LIST_FOREACH(sc, &gs->list, chain) {
		if (IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_dst, &dst.sin6_addr))
			break;
	}
	if (sc != NULL && (GRE2IFP(sc)->if_flags & IFF_UP) != 0){
		gre_input(m, off + sizeof(struct udphdr), IPPROTO_UDP, sc);
		NET_EPOCH_EXIT(et);
		return;
	}
	m_freem(m);
	NET_EPOCH_EXIT(et);
}

static int
in6_gre_setup_socket(struct gre_softc *sc)