Function tun_process_step2

dpdk/lib/ipsec/esp_inb.c:496–511

* step two for tunnel mode: * - read SQN value (for future use) * - cut of ICV, ESP tail and padding bytes * - cut of ESP header and IV, also if needed - L2/L3 headers * (controlled by *adj* value) */

 *   (controlled by *adj* value)
 */
static inline void *
tun_process_step2(struct rte_mbuf *mb, struct rte_mbuf *ml, uint32_t hlen,
	uint32_t adj, uint32_t tofs, uint32_t tlen, uint32_t *sqn)
{
	const struct rte_esp_hdr *ph;

	/* read SQN value */
	ph = rte_pktmbuf_mtod_offset(mb, const struct rte_esp_hdr *, hlen);
	sqn[0] = ph->seq;

	/* cut of ICV, ESP tail and padding bytes */
	mbuf_cut_seg_ofs(mb, ml, tofs, tlen);

	/* cut of L2/L3 headers, ESP header and IV */
	return rte_pktmbuf_adj(mb, adj);
}

/*
 * step two for transport mode: