examples/ipsec-secgw/ipsec.c

/*-
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 *       notice, this list of conditions and the following disclaimer.
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 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#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 int
create_session(struct ipsec_ctx *ipsec_ctx, struct ipsec_sa *sa)
{
    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;

    if (sa->type == RTE_SECURITY_ACTION_TYPE_NONE) {
        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 (sa->type != RTE_SECURITY_ACTION_TYPE_NONE) {
        struct rte_security_session_conf sess_conf = {
            .action_type = sa->type,
            .protocol = RTE_SECURITY_PROTOCOL_IPSEC,
            {.ipsec = {
                .spi = sa->spi,
                .salt = sa->salt,
                .options = { 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

        };

        if (sa->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);

            if (sess_conf.ipsec.mode ==
                    RTE_SECURITY_IPSEC_SA_MODE_TUNNEL) {
                struct rte_security_ipsec_tunnel_param *tunnel =
                        &sess_conf.ipsec.tunnel;
                if (sa->flags == IP4_TUNNEL) {
                    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);
                }
                /* TODO support for Transport and IPV6 tunnel */
            }

            sa->sec_session = rte_security_session_create(ctx,
                    &sess_conf, ipsec_ctx->session_pool);
            if (sa->sec_session == NULL) {
                RTE_LOG(ERR, IPSEC,
                "SEC Session init failed: err: %d\n", ret);
                return -1;
            }
        } else if (sa->type == RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO) {
            struct rte_flow_error err;
            struct rte_security_ctx *ctx = (struct rte_security_ctx *)
                            rte_eth_dev_get_sec_ctx(
                            sa->portid);
            const struct rte_security_capability *sec_cap;

            sa->sec_session = rte_security_session_create(ctx,
                    &sess_conf, ipsec_ctx->session_pool);
            if (sa->sec_session == NULL) {
                RTE_LOG(ERR, IPSEC,
                "SEC Session init failed: err: %d\n", ret);
                return -1;
            }

            sec_cap = rte_security_capabilities_get(ctx);

            /* iterate until ESP tunnel*/
            while (sec_cap->action !=
                    RTE_SECURITY_ACTION_TYPE_NONE) {

                if (sec_cap->action == sa->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;
            }

            sa->ol_flags = sec_cap->ol_flags;
            sa->security_ctx = ctx;
            sa->pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;

            sa->pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV4;
            sa->pattern[1].mask = &rte_flow_item_ipv4_mask;
            if (sa->flags & IP6_TUNNEL) {
                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 {
                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 = sa->sec_session;

            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);
            sa->flow = rte_flow_create(sa->portid,
                &sa->attr, sa->pattern, sa->action, &err);
            if (sa->flow == NULL) {
                RTE_LOG(ERR, IPSEC,
                    "Failed to create ipsec flow msg: %s\n",
                    err.message);
                return -1;
            }
        }
    } else {
        sa->crypto_session = rte_cryptodev_sym_session_create(
                ipsec_ctx->session_pool);
        rte_cryptodev_sym_session_init(ipsec_ctx->tbl[cdev_id_qp].id,
                sa->crypto_session, sa->xforms,
                ipsec_ctx->session_pool);

        rte_cryptodev_info_get(ipsec_ctx->tbl[cdev_id_qp].id,
                &cdev_info);
        if (cdev_info.sym.max_nb_sessions_per_qp > 0) {
            ret = rte_cryptodev_queue_pair_attach_sym_session(
                    ipsec_ctx->tbl[cdev_id_qp].id,
                    ipsec_ctx->tbl[cdev_id_qp].qp,
                    sa->crypto_session);
            if (ret < 0) {
                RTE_LOG(ERR, IPSEC,
                    "Session cannot be attached to qp %u\n",
                    ipsec_ctx->tbl[cdev_id_qp].qp);
                return -1;
            }
        }
    }
    sa->cdev_id_qp = cdev_id_qp;

    return 0;
}

static inline void
enqueue_cop(struct cdev_qp *cqp, struct rte_crypto_op *cop)
{
    int32_t ret, i;

    cqp->buf[cqp->len++] = cop;

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

static inline void
ipsec_enqueue(ipsec_xform_fn xform_func, struct ipsec_ctx *ipsec_ctx,
        struct rte_mbuf *pkts[], struct ipsec_sa *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 cdev_qp *cqp;

    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 = sas[i];
        priv->sa = sa;

        switch (sa->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(sa->sec_session == NULL)) &&
                    create_session(ipsec_ctx, sa)) {
                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,
                    sa->sec_session);
            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(sa->crypto_session == NULL)) &&
                    create_session(ipsec_ctx, sa)) {
                rte_pktmbuf_free(pkts[i]);
                continue;
            }

            rte_crypto_op_attach_sym_session(&priv->cop,
                    sa->crypto_session);

            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:
            break;
        case RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO:
            priv->cop.type = RTE_CRYPTO_OP_TYPE_SYMMETRIC;
            priv->cop.status = RTE_CRYPTO_OP_STATUS_NOT_PROCESSED;

            rte_prefetch0(&priv->sym_cop);

            if ((unlikely(sa->sec_session == NULL)) &&
                    create_session(ipsec_ctx, sa)) {
                rte_pktmbuf_free(pkts[i]);
                continue;
            }

            rte_security_attach_session(&priv->cop,
                    sa->sec_session);

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

            cqp = &ipsec_ctx->tbl[sa->cdev_id_qp];
            cqp->ol_pkts[cqp->ol_pkts_cnt++] = pkts[i];
            if (sa->ol_flags & RTE_SECURITY_TX_OLOAD_NEED_MDATA)
                rte_security_set_pkt_metadata(
                        sa->security_ctx,
                        sa->sec_session, 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 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;

        while (cqp->ol_pkts_cnt > 0 && nb_pkts < max_pkts) {
            pkt = cqp->ol_pkts[--cqp->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;
        }

        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 (sa->type == RTE_SECURITY_ACTION_TYPE_NONE) {
                ret = xform_func(pkt, sa, cops[j]);
                if (unlikely(ret)) {
                    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)
{
    struct ipsec_sa *sas[nb_pkts];

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

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

    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)
{
    struct ipsec_sa *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_dequeue(esp_outbound_post, ctx, pkts, len);
}