Function vxlan_encap6

freebsd/net/if_vxlan.c:2576–2692

}

static int
vxlan_encap6(struct vxlan_softc *sc, const union vxlan_sockaddr *fvxlsa,
    struct mbuf *m)
{
#ifdef INET6
	struct ifnet *ifp;
	struct ip6_hdr *ip6;
	const struct in6_addr *srcaddr, *dstaddr;
	uint16_t srcport, dstport;
	int len, mcast, error;
	struct route_in6 route, *ro;
	struct sockaddr_in6 *sin6;
	uint32_t csum_flags;

	NET_EPOCH_ASSERT();

	ifp = sc->vxl_ifp;
	srcaddr = &sc->vxl_src_addr.in6.sin6_addr;
	srcport = vxlan_pick_source_port(sc, m);
	dstaddr = &fvxlsa->in6.sin6_addr;
	dstport = fvxlsa->in6.sin6_port;

	M_PREPEND(m, sizeof(struct ip6_hdr) + sizeof(struct vxlanudphdr),
	    M_NOWAIT);
	if (m == NULL) {
		if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
		return (ENOBUFS);
	}

	len = m->m_pkthdr.len;

	ip6 = mtod(m, struct ip6_hdr *);
	ip6->ip6_flow = 0;		/* BMV: Keep in forwarding entry? */
	ip6->ip6_vfc = IPV6_VERSION;
	ip6->ip6_plen = 0;
	ip6->ip6_nxt = IPPROTO_UDP;
	ip6->ip6_hlim = sc->vxl_ttl;
	ip6->ip6_src = *srcaddr;
	ip6->ip6_dst = *dstaddr;

	vxlan_encap_header(sc, m, sizeof(struct ip6_hdr), srcport, dstport);

	mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1 : 0;
	m->m_flags &= ~(M_MCAST | M_BCAST);

	ro = NULL;
	m->m_pkthdr.csum_flags &= CSUM_FLAGS_TX;
	if (m->m_pkthdr.csum_flags != 0) {
		/*
		 * HW checksum (L3 and/or L4) or TSO has been requested.  Look
		 * up the ifnet for the outbound route and verify that the
		 * outbound ifnet can perform the requested operation on the
		 * inner frame.
		 */
		bzero(&route, sizeof(route));
		ro = &route;
		sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
		sin6->sin6_family = AF_INET6;