examples/ipsec-secgw/ipsec.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2016-2017 Intel Corporation
 */
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/ip.h>

#include <rte_branch_prediction.h>
#include <rte_log.h>
#include <rte_crypto.h>
#include <rte_security.h>
#include <rte_cryptodev.h>
#include <rte_ethdev.h>
#include <rte_mbuf.h>
#include <rte_hash.h>

#include "ipsec.h"
#include "esp.h"

static inline void
set_ipsec_conf(struct ipsec_sa *sa, struct rte_security_ipsec_xform *ipsec)
{
    if (ipsec->mode == RTE_SECURITY_IPSEC_SA_MODE_TUNNEL) {
        struct rte_security_ipsec_tunnel_param *tunnel =
                &ipsec->tunnel;
        if (IS_IP4_TUNNEL(sa->flags)) {
            tunnel->type =
                RTE_SECURITY_IPSEC_TUNNEL_IPV4;
            tunnel->ipv4.ttl = IPDEFTTL;

            memcpy((uint8_t *)&tunnel->ipv4.src_ip,
                (uint8_t *)&sa->src.ip.ip4, 4);

            memcpy((uint8_t *)&tunnel->ipv4.dst_ip,
                (uint8_t *)&sa->dst.ip.ip4, 4);
        } else if (IS_IP6_TUNNEL(sa->flags)) {
            tunnel->type =
                RTE_SECURITY_IPSEC_TUNNEL_IPV6;
            tunnel->ipv6.hlimit = IPDEFTTL;
            tunnel->ipv6.dscp = 0;
            tunnel->ipv6.flabel = 0;

            memcpy((uint8_t *)&tunnel->ipv6.src_addr,
                (uint8_t *)&sa->src.ip.ip6.ip6_b, 16);

            memcpy((uint8_t *)&tunnel->ipv6.dst_addr,
                (uint8_t *)&sa->dst.ip.ip6.ip6_b, 16);
        }
        /* TODO support for Transport */
    }
    ipsec->esn_soft_limit = IPSEC_OFFLOAD_ESN_SOFTLIMIT;
    ipsec->replay_win_sz = app_sa_prm.window_size;
    ipsec->options.esn = app_sa_prm.enable_esn;
}

int
create_lookaside_session(struct ipsec_ctx *ipsec_ctx, struct ipsec_sa *sa,
        struct rte_ipsec_session *ips)
{
    struct rte_cryptodev_info cdev_info;
    unsigned long cdev_id_qp = 0;
    int32_t ret = 0;
    struct cdev_key key = { 0 };

    key.lcore_id = (uint8_t)rte_lcore_id();

    key.cipher_algo = (uint8_t)sa->cipher_algo;
    key.auth_algo = (uint8_t)sa->auth_algo;
    key.aead_algo = (uint8_t)sa->aead_algo;

    ret = rte_hash_lookup_data(ipsec_ctx->cdev_map, &key,
            (void **)&cdev_id_qp);
    if (ret < 0) {
        RTE_LOG(ERR, IPSEC,
                "No cryptodev: core %u, cipher_algo %u, "
                "auth_algo %u, aead_algo %u\n",
                key.lcore_id,
                key.cipher_algo,
                key.auth_algo,
                key.aead_algo);
        return -1;
    }

    RTE_LOG_DP(DEBUG, IPSEC, "Create session for SA spi %u on cryptodev "
            "%u qp %u\n", sa->spi,
            ipsec_ctx->tbl[cdev_id_qp].id,
            ipsec_ctx->tbl[cdev_id_qp].qp);

    if (ips->type != RTE_SECURITY_ACTION_TYPE_NONE) {
        struct rte_security_session_conf sess_conf = {
            .action_type = ips->type,
            .protocol = RTE_SECURITY_PROTOCOL_IPSEC,
            {.ipsec = {
                .spi = sa->spi,
                .salt = sa->salt,
                .options = { 0 },
                .replay_win_sz = 0,
                .direction = sa->direction,
                .proto = RTE_SECURITY_IPSEC_SA_PROTO_ESP,
                .mode = (IS_TUNNEL(sa->flags)) ?
                    RTE_SECURITY_IPSEC_SA_MODE_TUNNEL :
                    RTE_SECURITY_IPSEC_SA_MODE_TRANSPORT,
            } },
            .crypto_xform = sa->xforms,
            .userdata = NULL,

        };

        if (ips->type == RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL) {
            struct rte_security_ctx *ctx = (struct rte_security_ctx *)
                            rte_cryptodev_get_sec_ctx(
                            ipsec_ctx->tbl[cdev_id_qp].id);

            /* Set IPsec parameters in conf */
            set_ipsec_conf(sa, &(sess_conf.ipsec));

            ips->security.ses = rte_security_session_create(ctx,
                    &sess_conf, ipsec_ctx->session_priv_pool);
            if (ips->security.ses == NULL) {
                RTE_LOG(ERR, IPSEC,
                "SEC Session init failed: err: %d\n", ret);
                return -1;
            }
        } else {
            RTE_LOG(ERR, IPSEC, "Inline not supported\n");
            return -1;
        }
    } else {
        ips->crypto.ses = rte_cryptodev_sym_session_create(
                ipsec_ctx->session_pool);
        rte_cryptodev_sym_session_init(ipsec_ctx->tbl[cdev_id_qp].id,
                ips->crypto.ses, sa->xforms,
                ipsec_ctx->session_priv_pool);

        rte_cryptodev_info_get(ipsec_ctx->tbl[cdev_id_qp].id,
                &cdev_info);
    }

    sa->cdev_id_qp = cdev_id_qp;

    return 0;
}

int
create_inline_session(struct socket_ctx *skt_ctx, struct ipsec_sa *sa,
        struct rte_ipsec_session *ips)
{
    int32_t ret = 0;
    struct rte_security_ctx *sec_ctx;
    struct rte_security_session_conf sess_conf = {
        .action_type = ips->type,
        .protocol = RTE_SECURITY_PROTOCOL_IPSEC,
        {.ipsec = {
            .spi = sa->spi,
            .salt = sa->salt,
            .options = { 0 },
            .replay_win_sz = 0,
            .direction = sa->direction,
            .proto = RTE_SECURITY_IPSEC_SA_PROTO_ESP,
            .mode = (sa->flags == IP4_TUNNEL ||
                    sa->flags == IP6_TUNNEL) ?
                    RTE_SECURITY_IPSEC_SA_MODE_TUNNEL :
                    RTE_SECURITY_IPSEC_SA_MODE_TRANSPORT,
        } },
        .crypto_xform = sa->xforms,
        .userdata = NULL,
    };

    RTE_LOG_DP(DEBUG, IPSEC, "Create session for SA spi %u on port %u\n",
        sa->spi, sa->portid);

    if (ips->type == RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO) {
        struct rte_flow_error err;
        const struct rte_security_capability *sec_cap;
        int ret = 0;

        sec_ctx = (struct rte_security_ctx *)
                    rte_eth_dev_get_sec_ctx(
                    sa->portid);
        if (sec_ctx == NULL) {
            RTE_LOG(ERR, IPSEC,
                " rte_eth_dev_get_sec_ctx failed\n");
            return -1;
        }

        ips->security.ses = rte_security_session_create(sec_ctx,
                &sess_conf, skt_ctx->session_pool);
        if (ips->security.ses == NULL) {
            RTE_LOG(ERR, IPSEC,
                "SEC Session init failed: err: %d\n", ret);
            return -1;
        }

        sec_cap = rte_security_capabilities_get(sec_ctx);

        /* iterate until ESP tunnel*/
        while (sec_cap->action != RTE_SECURITY_ACTION_TYPE_NONE) {
            if (sec_cap->action == ips->type &&
                sec_cap->protocol ==
                RTE_SECURITY_PROTOCOL_IPSEC &&
                sec_cap->ipsec.mode ==
                RTE_SECURITY_IPSEC_SA_MODE_TUNNEL &&
                sec_cap->ipsec.direction == sa->direction)
                break;
            sec_cap++;
        }

        if (sec_cap->action == RTE_SECURITY_ACTION_TYPE_NONE) {
            RTE_LOG(ERR, IPSEC,
                "No suitable security capability found\n");
            return -1;
        }

        ips->security.ol_flags = sec_cap->ol_flags;
        ips->security.ctx = sec_ctx;
        sa->pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;

        if (IS_IP6(sa->flags)) {
            sa->pattern[1].mask = &rte_flow_item_ipv6_mask;
            sa->pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV6;
            sa->pattern[1].spec = &sa->ipv6_spec;

            memcpy(sa->ipv6_spec.hdr.dst_addr,
                sa->dst.ip.ip6.ip6_b, 16);
            memcpy(sa->ipv6_spec.hdr.src_addr,
                   sa->src.ip.ip6.ip6_b, 16);
        } else if (IS_IP4(sa->flags)) {
            sa->pattern[1].mask = &rte_flow_item_ipv4_mask;
            sa->pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV4;
            sa->pattern[1].spec = &sa->ipv4_spec;

            sa->ipv4_spec.hdr.dst_addr = sa->dst.ip.ip4;
            sa->ipv4_spec.hdr.src_addr = sa->src.ip.ip4;
        }

        sa->pattern[2].type = RTE_FLOW_ITEM_TYPE_ESP;
        sa->pattern[2].spec = &sa->esp_spec;
        sa->pattern[2].mask = &rte_flow_item_esp_mask;
        sa->esp_spec.hdr.spi = rte_cpu_to_be_32(sa->spi);

        sa->pattern[3].type = RTE_FLOW_ITEM_TYPE_END;

        sa->action[0].type = RTE_FLOW_ACTION_TYPE_SECURITY;
        sa->action[0].conf = ips->security.ses;

        sa->action[1].type = RTE_FLOW_ACTION_TYPE_END;

        sa->attr.egress = (sa->direction ==
                RTE_SECURITY_IPSEC_SA_DIR_EGRESS);
        sa->attr.ingress = (sa->direction ==
                RTE_SECURITY_IPSEC_SA_DIR_INGRESS);
        if (sa->attr.ingress) {
            uint8_t rss_key[40];
            struct rte_eth_rss_conf rss_conf = {
                .rss_key = rss_key,
                .rss_key_len = 40,
            };
            struct rte_eth_dev_info dev_info;
            uint16_t queue[RTE_MAX_QUEUES_PER_PORT];
            struct rte_flow_action_rss action_rss;
            unsigned int i;
            unsigned int j;

            ret = rte_eth_dev_info_get(sa->portid, &dev_info);
            if (ret != 0) {
                RTE_LOG(ERR, IPSEC,
                    "Error during getting device (port %u) info: %s\n",
                    sa->portid, strerror(-ret));
                return ret;
            }

            sa->action[2].type = RTE_FLOW_ACTION_TYPE_END;
            /* Try RSS. */
            sa->action[1].type = RTE_FLOW_ACTION_TYPE_RSS;
            sa->action[1].conf = &action_rss;
            ret = rte_eth_dev_rss_hash_conf_get(sa->portid,
                    &rss_conf);
            if (ret != 0) {
                RTE_LOG(ERR, IPSEC,
                    "rte_eth_dev_rss_hash_conf_get:ret=%d\n",
                    ret);
                return -1;
            }
            for (i = 0, j = 0; i < dev_info.nb_rx_queues; ++i)
                queue[j++] = i;

            action_rss = (struct rte_flow_action_rss){
                    .types = rss_conf.rss_hf,
                    .key_len = rss_conf.rss_key_len,
                    .queue_num = j,
                    .key = rss_key,
                    .queue = queue,
            };
            ret = rte_flow_validate(sa->portid, &sa->attr,
                        sa->pattern, sa->action,
                        &err);
            if (!ret)
                goto flow_create;
            /* Try Queue. */
            sa->action[1].type = RTE_FLOW_ACTION_TYPE_QUEUE;
            sa->action[1].conf =
                &(struct rte_flow_action_queue){
                .index = 0,
            };
            ret = rte_flow_validate(sa->portid, &sa->attr,
                        sa->pattern, sa->action,
                        &err);
            /* Try End. */
            sa->action[1].type = RTE_FLOW_ACTION_TYPE_END;
            sa->action[1].conf = NULL;
            ret = rte_flow_validate(sa->portid, &sa->attr,
                        sa->pattern, sa->action,
                        &err);
            if (ret)
                goto flow_create_failure;
        } else if (sa->attr.egress &&
                (ips->security.ol_flags &
                    RTE_SECURITY_TX_HW_TRAILER_OFFLOAD)) {
            sa->action[1].type =
                    RTE_FLOW_ACTION_TYPE_PASSTHRU;
            sa->action[2].type =
                    RTE_FLOW_ACTION_TYPE_END;
        }
flow_create:
        sa->flow = rte_flow_create(sa->portid,
                &sa->attr, sa->pattern, sa->action, &err);
        if (sa->flow == NULL) {
flow_create_failure:
            RTE_LOG(ERR, IPSEC,
                "Failed to create ipsec flow msg: %s\n",
                err.message);
            return -1;
        }
    } else if (ips->type == RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL) {
        const struct rte_security_capability *sec_cap;

        sec_ctx = (struct rte_security_ctx *)
                rte_eth_dev_get_sec_ctx(sa->portid);

        if (sec_ctx == NULL) {
            RTE_LOG(ERR, IPSEC,
                "Ethernet device doesn't have security features registered\n");
            return -1;
        }

        /* Set IPsec parameters in conf */
        set_ipsec_conf(sa, &(sess_conf.ipsec));

        /* Save SA as userdata for the security session. When
         * the packet is received, this userdata will be
         * retrieved using the metadata from the packet.
         *
         * The PMD is expected to set similar metadata for other
         * operations, like rte_eth_event, which are tied to
         * security session. In such cases, the userdata could
         * be obtained to uniquely identify the security
         * parameters denoted.
         */

        sess_conf.userdata = (void *) sa;

        ips->security.ses = rte_security_session_create(sec_ctx,
                    &sess_conf, skt_ctx->session_pool);
        if (ips->security.ses == NULL) {
            RTE_LOG(ERR, IPSEC,
                "SEC Session init failed: err: %d\n", ret);
            return -1;
        }

        sec_cap = rte_security_capabilities_get(sec_ctx);
        if (sec_cap == NULL) {
            RTE_LOG(ERR, IPSEC,
                "No capabilities registered\n");
            return -1;
        }

        /* iterate until ESP tunnel*/
        while (sec_cap->action !=
                RTE_SECURITY_ACTION_TYPE_NONE) {
            if (sec_cap->action == ips->type &&
                sec_cap->protocol ==
                RTE_SECURITY_PROTOCOL_IPSEC &&
                sec_cap->ipsec.mode ==
                sess_conf.ipsec.mode &&
                sec_cap->ipsec.direction == sa->direction)
                break;
            sec_cap++;
        }

        if (sec_cap->action == RTE_SECURITY_ACTION_TYPE_NONE) {
            RTE_LOG(ERR, IPSEC,
                "No suitable security capability found\n");
            return -1;
        }

        ips->security.ol_flags = sec_cap->ol_flags;
        ips->security.ctx = sec_ctx;
    }
    sa->cdev_id_qp = 0;

    return 0;
}

/*
 * queue crypto-ops into PMD queue.
 */
void
enqueue_cop_burst(struct cdev_qp *cqp)
{
    uint32_t i, len, ret;

    len = cqp->len;
    ret = rte_cryptodev_enqueue_burst(cqp->id, cqp->qp, cqp->buf, len);
    if (ret < len) {
        RTE_LOG_DP(DEBUG, IPSEC, "Cryptodev %u queue %u:"
            " enqueued %u crypto ops out of %u\n",
            cqp->id, cqp->qp, ret, len);
            /* drop packets that we fail to enqueue */
            for (i = ret; i < len; i++)
                rte_pktmbuf_free(cqp->buf[i]->sym->m_src);
    }
    cqp->in_flight += ret;
    cqp->len = 0;
}

static inline void
enqueue_cop(struct cdev_qp *cqp, struct rte_crypto_op *cop)
{
    cqp->buf[cqp->len++] = cop;

    if (cqp->len == MAX_PKT_BURST)
        enqueue_cop_burst(cqp);
}

static inline void
ipsec_enqueue(ipsec_xform_fn xform_func, struct ipsec_ctx *ipsec_ctx,
        struct rte_mbuf *pkts[], void *sas[],
        uint16_t nb_pkts)
{
    int32_t ret = 0, i;
    struct ipsec_mbuf_metadata *priv;
    struct rte_crypto_sym_op *sym_cop;
    struct ipsec_sa *sa;
    struct rte_ipsec_session *ips;

    for (i = 0; i < nb_pkts; i++) {
        if (unlikely(sas[i] == NULL)) {
            rte_pktmbuf_free(pkts[i]);
            continue;
        }

        rte_prefetch0(sas[i]);
        rte_prefetch0(pkts[i]);

        priv = get_priv(pkts[i]);
        sa = ipsec_mask_saptr(sas[i]);
        priv->sa = sa;
        ips = ipsec_get_primary_session(sa);

        switch (ips->type) {
        case RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL:
            priv->cop.type = RTE_CRYPTO_OP_TYPE_SYMMETRIC;
            priv->cop.status = RTE_CRYPTO_OP_STATUS_NOT_PROCESSED;

            rte_prefetch0(&priv->sym_cop);

            if ((unlikely(ips->security.ses == NULL)) &&
                create_lookaside_session(ipsec_ctx, sa, ips)) {
                rte_pktmbuf_free(pkts[i]);
                continue;
            }

            sym_cop = get_sym_cop(&priv->cop);
            sym_cop->m_src = pkts[i];

            rte_security_attach_session(&priv->cop,
                ips->security.ses);
            break;
        case RTE_SECURITY_ACTION_TYPE_NONE:

            priv->cop.type = RTE_CRYPTO_OP_TYPE_SYMMETRIC;
            priv->cop.status = RTE_CRYPTO_OP_STATUS_NOT_PROCESSED;

            rte_prefetch0(&priv->sym_cop);

            if ((unlikely(ips->crypto.ses == NULL)) &&
                create_lookaside_session(ipsec_ctx, sa, ips)) {
                rte_pktmbuf_free(pkts[i]);
                continue;
            }

            rte_crypto_op_attach_sym_session(&priv->cop,
                    ips->crypto.ses);

            ret = xform_func(pkts[i], sa, &priv->cop);
            if (unlikely(ret)) {
                rte_pktmbuf_free(pkts[i]);
                continue;
            }
            break;
        case RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL:
            RTE_ASSERT(ips->security.ses != NULL);
            ipsec_ctx->ol_pkts[ipsec_ctx->ol_pkts_cnt++] = pkts[i];
            if (ips->security.ol_flags &
                RTE_SECURITY_TX_OLOAD_NEED_MDATA)
                rte_security_set_pkt_metadata(
                    ips->security.ctx, ips->security.ses,
                    pkts[i], NULL);
            continue;
        case RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO:
            RTE_ASSERT(ips->security.ses != NULL);
            priv->cop.type = RTE_CRYPTO_OP_TYPE_SYMMETRIC;
            priv->cop.status = RTE_CRYPTO_OP_STATUS_NOT_PROCESSED;

            rte_prefetch0(&priv->sym_cop);
            rte_security_attach_session(&priv->cop,
                    ips->security.ses);

            ret = xform_func(pkts[i], sa, &priv->cop);
            if (unlikely(ret)) {
                rte_pktmbuf_free(pkts[i]);
                continue;
            }

            ipsec_ctx->ol_pkts[ipsec_ctx->ol_pkts_cnt++] = pkts[i];
            if (ips->security.ol_flags &
                RTE_SECURITY_TX_OLOAD_NEED_MDATA)
                rte_security_set_pkt_metadata(
                    ips->security.ctx, ips->security.ses,
                    pkts[i], NULL);
            continue;
        }

        RTE_ASSERT(sa->cdev_id_qp < ipsec_ctx->nb_qps);
        enqueue_cop(&ipsec_ctx->tbl[sa->cdev_id_qp], &priv->cop);
    }
}

static inline int32_t
ipsec_inline_dequeue(ipsec_xform_fn xform_func, struct ipsec_ctx *ipsec_ctx,
          struct rte_mbuf *pkts[], uint16_t max_pkts)
{
    int32_t nb_pkts, ret;
    struct ipsec_mbuf_metadata *priv;
    struct ipsec_sa *sa;
    struct rte_mbuf *pkt;

    nb_pkts = 0;
    while (ipsec_ctx->ol_pkts_cnt > 0 && nb_pkts < max_pkts) {
        pkt = ipsec_ctx->ol_pkts[--ipsec_ctx->ol_pkts_cnt];
        rte_prefetch0(pkt);
        priv = get_priv(pkt);
        sa = priv->sa;
        ret = xform_func(pkt, sa, &priv->cop);
        if (unlikely(ret)) {
            rte_pktmbuf_free(pkt);
            continue;
        }
        pkts[nb_pkts++] = pkt;
    }

    return nb_pkts;
}

static inline int
ipsec_dequeue(ipsec_xform_fn xform_func, struct ipsec_ctx *ipsec_ctx,
          struct rte_mbuf *pkts[], uint16_t max_pkts)
{
    int32_t nb_pkts = 0, ret = 0, i, j, nb_cops;
    struct ipsec_mbuf_metadata *priv;
    struct rte_crypto_op *cops[max_pkts];
    struct ipsec_sa *sa;
    struct rte_mbuf *pkt;

    for (i = 0; i < ipsec_ctx->nb_qps && nb_pkts < max_pkts; i++) {
        struct cdev_qp *cqp;

        cqp = &ipsec_ctx->tbl[ipsec_ctx->last_qp++];
        if (ipsec_ctx->last_qp == ipsec_ctx->nb_qps)
            ipsec_ctx->last_qp %= ipsec_ctx->nb_qps;

        if (cqp->in_flight == 0)
            continue;

        nb_cops = rte_cryptodev_dequeue_burst(cqp->id, cqp->qp,
                cops, max_pkts - nb_pkts);

        cqp->in_flight -= nb_cops;

        for (j = 0; j < nb_cops; j++) {
            pkt = cops[j]->sym->m_src;
            rte_prefetch0(pkt);

            priv = get_priv(pkt);
            sa = priv->sa;

            RTE_ASSERT(sa != NULL);

            if (ipsec_get_action_type(sa) ==
                RTE_SECURITY_ACTION_TYPE_NONE) {
                ret = xform_func(pkt, sa, cops[j]);
                if (unlikely(ret)) {
                    rte_pktmbuf_free(pkt);
                    continue;
                }
            } else if (ipsec_get_action_type(sa) ==
                RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL) {
                if (cops[j]->status) {
                    rte_pktmbuf_free(pkt);
                    continue;
                }
            }
            pkts[nb_pkts++] = pkt;
        }
    }

    /* return packets */
    return nb_pkts;
}

uint16_t
ipsec_inbound(struct ipsec_ctx *ctx, struct rte_mbuf *pkts[],
        uint16_t nb_pkts, uint16_t len)
{
    void *sas[nb_pkts];

    inbound_sa_lookup(ctx->sa_ctx, pkts, sas, nb_pkts);

    ipsec_enqueue(esp_inbound, ctx, pkts, sas, nb_pkts);

    return ipsec_inline_dequeue(esp_inbound_post, ctx, pkts, len);
}

uint16_t
ipsec_inbound_cqp_dequeue(struct ipsec_ctx *ctx, struct rte_mbuf *pkts[],
        uint16_t len)
{
    return ipsec_dequeue(esp_inbound_post, ctx, pkts, len);
}

uint16_t
ipsec_outbound(struct ipsec_ctx *ctx, struct rte_mbuf *pkts[],
        uint32_t sa_idx[], uint16_t nb_pkts, uint16_t len)
{
    void *sas[nb_pkts];

    outbound_sa_lookup(ctx->sa_ctx, sa_idx, sas, nb_pkts);

    ipsec_enqueue(esp_outbound, ctx, pkts, sas, nb_pkts);

    return ipsec_inline_dequeue(esp_outbound_post, ctx, pkts, len);
}

uint16_t
ipsec_outbound_cqp_dequeue(struct ipsec_ctx *ctx, struct rte_mbuf *pkts[],
        uint16_t len)
{
    return ipsec_dequeue(esp_outbound_post, ctx, pkts, len);
}