+
+ ip4 = rte_pktmbuf_mtod(m, struct ip *);
+ if (likely(ip4->ip_v == IPVERSION)) {
+ if (unlikely(sa->flags == TRANSPORT)) {
+ ip_hdr_len = ip4->ip_hl * 4;
+ nlp = ip4->ip_p;
+ } else
+ nlp = IPPROTO_IPIP;
+ } else if (ip4->ip_v == IP6_VERSION) {
+ if (unlikely(sa->flags == TRANSPORT)) {
+ /* XXX No option headers supported */
+ ip_hdr_len = sizeof(struct ip6_hdr);
+ ip6 = (struct ip6_hdr *)ip4;
+ nlp = ip6->ip6_nxt;
+ } else
+ nlp = IPPROTO_IPV6;
+ } else {
+ RTE_LOG(ERR, IPSEC_ESP, "invalid IP packet type %d\n",
+ ip4->ip_v);
+ return -EINVAL;
+ }
+
+ /* Padded payload length */
+ pad_payload_len = RTE_ALIGN_CEIL(rte_pktmbuf_pkt_len(m) -
+ ip_hdr_len + 2, sa->block_size);
+ pad_len = pad_payload_len + ip_hdr_len - rte_pktmbuf_pkt_len(m);
+
+ RTE_ASSERT(sa->flags == IP4_TUNNEL || sa->flags == IP6_TUNNEL ||
+ sa->flags == TRANSPORT);
+
+ if (likely(sa->flags == IP4_TUNNEL))