+static int
+parse_ipv6(struct ofpbuf *packet, struct flow *flow)
+{
+ struct ip6_hdr *nh;
+ int nh_len = sizeof(struct ip6_hdr);
+ ovs_be32 tc_flow;
+ int nexthdr;
+
+ if (packet->size < sizeof *nh) {
+ return -EINVAL;
+ }
+
+ nh = packet->data;
+ nexthdr = nh->ip6_nxt;
+
+ flow->ipv6_src = nh->ip6_src;
+ flow->ipv6_dst = nh->ip6_dst;
+
+ tc_flow = get_unaligned_be32(&nh->ip6_flow);
+ flow->nw_tos = (ntohl(tc_flow) >> 4) & IP_DSCP_MASK;
+ flow->nw_proto = IPPROTO_NONE;
+
+ while (1) {
+ if ((nexthdr != IPPROTO_HOPOPTS)
+ && (nexthdr != IPPROTO_ROUTING)
+ && (nexthdr != IPPROTO_DSTOPTS)
+ && (nexthdr != IPPROTO_AH)
+ && (nexthdr != IPPROTO_FRAGMENT)) {
+ /* It's either a terminal header (e.g., TCP, UDP) or one we
+ * don't understand. In either case, we're done with the
+ * packet, so use it to fill in 'nw_proto'. */
+ break;
+ }
+
+ /* We only verify that at least 8 bytes of the next header are
+ * available, but many of these headers are longer. Ensure that
+ * accesses within the extension header are within those first 8
+ * bytes. */
+ if (packet->size < nh_len + 8) {
+ return -EINVAL;
+ }
+
+ if ((nexthdr == IPPROTO_HOPOPTS)
+ || (nexthdr == IPPROTO_ROUTING)
+ || (nexthdr == IPPROTO_DSTOPTS)) {
+ /* These headers, while different, have the fields we care about
+ * in the same location and with the same interpretation. */
+ struct ip6_ext *ext_hdr;
+
+ ext_hdr = (struct ip6_ext *)((char *)packet->data + nh_len);
+ nexthdr = ext_hdr->ip6e_nxt;
+ nh_len += (ext_hdr->ip6e_len + 1) * 8;
+ } else if (nexthdr == IPPROTO_AH) {
+ /* A standard AH definition isn't available, but the fields
+ * we care about are in the same location as the generic
+ * option header--only the header length is calculated
+ * differently. */
+ struct ip6_ext *ext_hdr;
+
+ ext_hdr = (struct ip6_ext *)((char *)packet->data + nh_len);
+ nexthdr = ext_hdr->ip6e_nxt;
+ nh_len += (ext_hdr->ip6e_len + 2) * 4;
+ } else if (nexthdr == IPPROTO_FRAGMENT) {
+ struct ip6_frag *frag_hdr;
+
+ frag_hdr = (struct ip6_frag *)((char *)packet->data + nh_len);
+
+ nexthdr = frag_hdr->ip6f_nxt;
+ nh_len += sizeof *frag_hdr;
+
+ /* We only process the first fragment. */
+ if ((frag_hdr->ip6f_offlg & IP6F_OFF_MASK) != htons(0)) {
+ nexthdr = IPPROTO_FRAGMENT;
+ break;
+ }
+ }
+ }
+
+ flow->nw_proto = nexthdr;
+ return nh_len;
+}
+
+/* Neighbor Discovery Solicitation and Advertisement messages are
+ * identical in structure, so we'll just use one of them. To be safe,
+ * we'll assert that they're still identical. */
+BUILD_ASSERT_DECL(sizeof(struct nd_neighbor_solicit)
+ == sizeof(struct nd_neighbor_advert));
+
+static bool
+parse_icmpv6(struct ofpbuf *b, struct flow *flow, int icmp_len)
+{
+ const struct icmp6_hdr *icmp = pull_icmpv6(b);
+
+ if (!icmp) {
+ return false;
+ }
+
+ /* The ICMPv6 type and code fields use the 16-bit transport port
+ * fields, so we need to store them in 16-bit network byte order. */
+ flow->icmp_type = htons(icmp->icmp6_type);
+ flow->icmp_code = htons(icmp->icmp6_code);
+
+ if (!icmp->icmp6_code
+ && ((icmp->icmp6_type == ND_NEIGHBOR_SOLICIT)
+ || (icmp->icmp6_type == ND_NEIGHBOR_ADVERT))) {
+ struct nd_neighbor_solicit *nd_ns; /* Identical to ND advert */
+
+ /* In order to process neighbor discovery options, we need the
+ * entire packet. */
+ if ((icmp_len < sizeof *nd_ns)
+ || (!ofpbuf_try_pull(b, sizeof *nd_ns - sizeof *icmp))) {
+ return false;
+ }
+ nd_ns = (struct nd_neighbor_solicit *)icmp;
+ flow->nd_target = nd_ns->nd_ns_target;
+
+ icmp_len -= sizeof(*nd_ns);
+ while (icmp_len >= 8) {
+ struct nd_opt_hdr *nd_opt;
+ int opt_len;
+ const uint8_t *data;
+
+ /* The minimum size of an option is 8 bytes, which also is
+ * the size of Ethernet link-layer options. */
+ nd_opt = ofpbuf_pull(b, 8);
+ if (!nd_opt->nd_opt_len || nd_opt->nd_opt_len * 8 > icmp_len) {
+ goto invalid;
+ }
+ opt_len = nd_opt->nd_opt_len * 8;
+ data = (const uint8_t *)(nd_opt + 1);
+
+ /* Store the link layer address if the appropriate option is
+ * provided. It is considered an error if the same link
+ * layer option is specified twice. */
+ if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LINKADDR
+ && opt_len == 8) {
+ if (eth_addr_is_zero(flow->arp_sha)) {
+ memcpy(flow->arp_sha, data, ETH_ADDR_LEN);
+ } else {
+ goto invalid;
+ }
+ } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LINKADDR
+ && opt_len == 8) {
+ if (eth_addr_is_zero(flow->arp_tha)) {
+ memcpy(flow->arp_tha, data, ETH_ADDR_LEN);
+ } else {
+ goto invalid;
+ }
+ }
+
+ /* Pull the rest of this option. */
+ if (!ofpbuf_try_pull(b, opt_len - 8)) {
+ goto invalid;
+ }
+
+ icmp_len -= opt_len;
+ }
+ }
+
+ return true;
+
+invalid:
+ memset(&flow->nd_target, '\0', sizeof(flow->nd_target));
+ memset(flow->arp_sha, '\0', sizeof(flow->arp_sha));
+ memset(flow->arp_tha, '\0', sizeof(flow->arp_tha));
+
+ return false;
+
+}
+
+/* Initializes 'flow' members from 'packet', 'tun_id', and 'in_port.
+ * Initializes 'packet' header pointers as follows: