examples/ipsec-secgw/sa.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2016-2017 Intel Corporation
 */

/*
 * Security Associations
 */
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>

#include <rte_memzone.h>
#include <rte_crypto.h>
#include <rte_security.h>
#include <rte_cryptodev.h>
#include <rte_byteorder.h>
#include <rte_errno.h>
#include <rte_ip.h>
#include <rte_random.h>
#include <rte_ethdev.h>

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

#define IPDEFTTL 64

struct supported_cipher_algo {
        const char *keyword;
        enum rte_crypto_cipher_algorithm algo;
        uint16_t iv_len;
        uint16_t block_size;
        uint16_t key_len;
};

struct supported_auth_algo {
        const char *keyword;
        enum rte_crypto_auth_algorithm algo;
        uint16_t digest_len;
        uint16_t key_len;
        uint8_t key_not_req;
};

struct supported_aead_algo {
        const char *keyword;
        enum rte_crypto_aead_algorithm algo;
        uint16_t iv_len;
        uint16_t block_size;
        uint16_t digest_len;
        uint16_t key_len;
        uint8_t aad_len;
};


const struct supported_cipher_algo cipher_algos[] = {
        {
                .keyword = "null",
                .algo = RTE_CRYPTO_CIPHER_NULL,
                .iv_len = 0,
                .block_size = 4,
                .key_len = 0
        },
        {
                .keyword = "aes-128-cbc",
                .algo = RTE_CRYPTO_CIPHER_AES_CBC,
                .iv_len = 16,
                .block_size = 16,
                .key_len = 16
        },
        {
                .keyword = "aes-256-cbc",
                .algo = RTE_CRYPTO_CIPHER_AES_CBC,
                .iv_len = 16,
                .block_size = 16,
                .key_len = 32
        },
        {
                .keyword = "aes-128-ctr",
                .algo = RTE_CRYPTO_CIPHER_AES_CTR,
                .iv_len = 8,
                .block_size = 16, /* XXX AESNI MB limition, should be 4 */
                .key_len = 20
        }
};

const struct supported_auth_algo auth_algos[] = {
        {
                .keyword = "null",
                .algo = RTE_CRYPTO_AUTH_NULL,
                .digest_len = 0,
                .key_len = 0,
                .key_not_req = 1
        },
        {
                .keyword = "sha1-hmac",
                .algo = RTE_CRYPTO_AUTH_SHA1_HMAC,
                .digest_len = 12,
                .key_len = 20
        },
        {
                .keyword = "sha256-hmac",
                .algo = RTE_CRYPTO_AUTH_SHA256_HMAC,
                .digest_len = 12,
                .key_len = 32
        }
};

const struct supported_aead_algo aead_algos[] = {
        {
                .keyword = "aes-128-gcm",
                .algo = RTE_CRYPTO_AEAD_AES_GCM,
                .iv_len = 8,
                .block_size = 4,
                .key_len = 20,
                .digest_len = 16,
                .aad_len = 8,
        }
};

struct ipsec_sa sa_out[IPSEC_SA_MAX_ENTRIES];
uint32_t nb_sa_out;

struct ipsec_sa sa_in[IPSEC_SA_MAX_ENTRIES];
uint32_t nb_sa_in;

static const struct supported_cipher_algo *
find_match_cipher_algo(const char *cipher_keyword)
{
        size_t i;

        for (i = 0; i < RTE_DIM(cipher_algos); i++) {
                const struct supported_cipher_algo *algo =
                        &cipher_algos[i];

                if (strcmp(cipher_keyword, algo->keyword) == 0)
                        return algo;
        }

        return NULL;
}

static const struct supported_auth_algo *
find_match_auth_algo(const char *auth_keyword)
{
        size_t i;

        for (i = 0; i < RTE_DIM(auth_algos); i++) {
                const struct supported_auth_algo *algo =
                        &auth_algos[i];

                if (strcmp(auth_keyword, algo->keyword) == 0)
                        return algo;
        }

        return NULL;
}

static const struct supported_aead_algo *
find_match_aead_algo(const char *aead_keyword)
{
        size_t i;

        for (i = 0; i < RTE_DIM(aead_algos); i++) {
                const struct supported_aead_algo *algo =
                        &aead_algos[i];

                if (strcmp(aead_keyword, algo->keyword) == 0)
                        return algo;
        }

        return NULL;
}

static uint32_t
parse_key_string(const char *key_str, uint8_t *key)
{
        const char *pt_start = key_str, *pt_end = key_str;
        uint32_t nb_bytes = 0;

        while (pt_end != NULL) {
                char sub_str[3] = {0};

                pt_end = strchr(pt_start, ':');

                if (pt_end == NULL) {
                        if (strlen(pt_start) > 2)
                                return 0;
                        strncpy(sub_str, pt_start, 2);
                } else {
                        if (pt_end - pt_start > 2)
                                return 0;

                        strncpy(sub_str, pt_start, pt_end - pt_start);
                        pt_start = pt_end + 1;
                }

                key[nb_bytes++] = strtol(sub_str, NULL, 16);
        }

        return nb_bytes;
}

void
parse_sa_tokens(char **tokens, uint32_t n_tokens,
        struct parse_status *status)
{
        struct ipsec_sa *rule = NULL;
        uint32_t ti; /*token index*/
        uint32_t *ri /*rule index*/;
        uint32_t cipher_algo_p = 0;
        uint32_t auth_algo_p = 0;
        uint32_t aead_algo_p = 0;
        uint32_t src_p = 0;
        uint32_t dst_p = 0;
        uint32_t mode_p = 0;
        uint32_t type_p = 0;
        uint32_t portid_p = 0;

        if (strcmp(tokens[0], "in") == 0) {
                ri = &nb_sa_in;

                APP_CHECK(*ri <= IPSEC_SA_MAX_ENTRIES - 1, status,
                        "too many sa rules, abort insertion\n");
                if (status->status < 0)
                        return;

                rule = &sa_in[*ri];
        } else {
                ri = &nb_sa_out;

                APP_CHECK(*ri <= IPSEC_SA_MAX_ENTRIES - 1, status,
                        "too many sa rules, abort insertion\n");
                if (status->status < 0)
                        return;

                rule = &sa_out[*ri];
        }

        /* spi number */
        APP_CHECK_TOKEN_IS_NUM(tokens, 1, status);
        if (status->status < 0)
                return;
        if (atoi(tokens[1]) == INVALID_SPI)
                return;
        rule->spi = atoi(tokens[1]);

        for (ti = 2; ti < n_tokens; ti++) {
                if (strcmp(tokens[ti], "mode") == 0) {
                        APP_CHECK_PRESENCE(mode_p, tokens[ti], status);
                        if (status->status < 0)
                                return;

                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        if (strcmp(tokens[ti], "ipv4-tunnel") == 0)
                                rule->flags = IP4_TUNNEL;
                        else if (strcmp(tokens[ti], "ipv6-tunnel") == 0)
                                rule->flags = IP6_TUNNEL;
                        else if (strcmp(tokens[ti], "transport") == 0)
                                rule->flags = TRANSPORT;
                        else {
                                APP_CHECK(0, status, "unrecognized "
                                        "input \"%s\"", tokens[ti]);
                                return;
                        }

                        mode_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "cipher_algo") == 0) {
                        const struct supported_cipher_algo *algo;
                        uint32_t key_len;

                        APP_CHECK_PRESENCE(cipher_algo_p, tokens[ti],
                                status);
                        if (status->status < 0)
                                return;

                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        algo = find_match_cipher_algo(tokens[ti]);

                        APP_CHECK(algo != NULL, status, "unrecognized "
                                "input \"%s\"", tokens[ti]);

                        rule->cipher_algo = algo->algo;
                        rule->block_size = algo->block_size;
                        rule->iv_len = algo->iv_len;
                        rule->cipher_key_len = algo->key_len;

                        /* for NULL algorithm, no cipher key required */
                        if (rule->cipher_algo == RTE_CRYPTO_CIPHER_NULL) {
                                cipher_algo_p = 1;
                                continue;
                        }

                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        APP_CHECK(strcmp(tokens[ti], "cipher_key") == 0,
                                status, "unrecognized input \"%s\", "
                                "expect \"cipher_key\"", tokens[ti]);
                        if (status->status < 0)
                                return;

                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        key_len = parse_key_string(tokens[ti],
                                rule->cipher_key);
                        APP_CHECK(key_len == rule->cipher_key_len, status,
                                "unrecognized input \"%s\"", tokens[ti]);
                        if (status->status < 0)
                                return;

                        if (algo->algo == RTE_CRYPTO_CIPHER_AES_CBC)
                                rule->salt = (uint32_t)rte_rand();

                        if (algo->algo == RTE_CRYPTO_CIPHER_AES_CTR) {
                                key_len -= 4;
                                rule->cipher_key_len = key_len;
                                memcpy(&rule->salt,
                                        &rule->cipher_key[key_len], 4);
                        }

                        cipher_algo_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "auth_algo") == 0) {
                        const struct supported_auth_algo *algo;
                        uint32_t key_len;

                        APP_CHECK_PRESENCE(auth_algo_p, tokens[ti],
                                status);
                        if (status->status < 0)
                                return;

                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        algo = find_match_auth_algo(tokens[ti]);
                        APP_CHECK(algo != NULL, status, "unrecognized "
                                "input \"%s\"", tokens[ti]);

                        rule->auth_algo = algo->algo;
                        rule->auth_key_len = algo->key_len;
                        rule->digest_len = algo->digest_len;

                        /* NULL algorithm and combined algos do not
                         * require auth key
                         */
                        if (algo->key_not_req) {
                                auth_algo_p = 1;
                                continue;
                        }

                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        APP_CHECK(strcmp(tokens[ti], "auth_key") == 0,
                                status, "unrecognized input \"%s\", "
                                "expect \"auth_key\"", tokens[ti]);
                        if (status->status < 0)
                                return;

                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        key_len = parse_key_string(tokens[ti],
                                rule->auth_key);
                        APP_CHECK(key_len == rule->auth_key_len, status,
                                "unrecognized input \"%s\"", tokens[ti]);
                        if (status->status < 0)
                                return;

                        auth_algo_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "aead_algo") == 0) {
                        const struct supported_aead_algo *algo;
                        uint32_t key_len;

                        APP_CHECK_PRESENCE(aead_algo_p, tokens[ti],
                                status);
                        if (status->status < 0)
                                return;

                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        algo = find_match_aead_algo(tokens[ti]);

                        APP_CHECK(algo != NULL, status, "unrecognized "
                                "input \"%s\"", tokens[ti]);

                        rule->aead_algo = algo->algo;
                        rule->cipher_key_len = algo->key_len;
                        rule->digest_len = algo->digest_len;
                        rule->aad_len = algo->aad_len;
                        rule->block_size = algo->block_size;
                        rule->iv_len = algo->iv_len;

                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        APP_CHECK(strcmp(tokens[ti], "aead_key") == 0,
                                status, "unrecognized input \"%s\", "
                                "expect \"aead_key\"", tokens[ti]);
                        if (status->status < 0)
                                return;

                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        key_len = parse_key_string(tokens[ti],
                                rule->cipher_key);
                        APP_CHECK(key_len == rule->cipher_key_len, status,
                                "unrecognized input \"%s\"", tokens[ti]);
                        if (status->status < 0)
                                return;

                        key_len -= 4;
                        rule->cipher_key_len = key_len;
                        memcpy(&rule->salt,
                                &rule->cipher_key[key_len], 4);

                        aead_algo_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "src") == 0) {
                        APP_CHECK_PRESENCE(src_p, tokens[ti], status);
                        if (status->status < 0)
                                return;

                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        if (rule->flags == IP4_TUNNEL) {
                                struct in_addr ip;

                                APP_CHECK(parse_ipv4_addr(tokens[ti],
                                        &ip, NULL) == 0, status,
                                        "unrecognized input \"%s\", "
                                        "expect valid ipv4 addr",
                                        tokens[ti]);
                                if (status->status < 0)
                                        return;
                                rule->src.ip.ip4 = rte_bswap32(
                                        (uint32_t)ip.s_addr);
                        } else if (rule->flags == IP6_TUNNEL) {
                                struct in6_addr ip;

                                APP_CHECK(parse_ipv6_addr(tokens[ti], &ip,
                                        NULL) == 0, status,
                                        "unrecognized input \"%s\", "
                                        "expect valid ipv6 addr",
                                        tokens[ti]);
                                if (status->status < 0)
                                        return;
                                memcpy(rule->src.ip.ip6.ip6_b,
                                        ip.s6_addr, 16);
                        } else if (rule->flags == TRANSPORT) {
                                APP_CHECK(0, status, "unrecognized input "
                                        "\"%s\"", tokens[ti]);
                                return;
                        }

                        src_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "dst") == 0) {
                        APP_CHECK_PRESENCE(dst_p, tokens[ti], status);
                        if (status->status < 0)
                                return;

                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        if (rule->flags == IP4_TUNNEL) {
                                struct in_addr ip;

                                APP_CHECK(parse_ipv4_addr(tokens[ti],
                                        &ip, NULL) == 0, status,
                                        "unrecognized input \"%s\", "
                                        "expect valid ipv4 addr",
                                        tokens[ti]);
                                if (status->status < 0)
                                        return;
                                rule->dst.ip.ip4 = rte_bswap32(
                                        (uint32_t)ip.s_addr);
                        } else if (rule->flags == IP6_TUNNEL) {
                                struct in6_addr ip;

                                APP_CHECK(parse_ipv6_addr(tokens[ti], &ip,
                                        NULL) == 0, status,
                                        "unrecognized input \"%s\", "
                                        "expect valid ipv6 addr",
                                        tokens[ti]);
                                if (status->status < 0)
                                        return;
                                memcpy(rule->dst.ip.ip6.ip6_b, ip.s6_addr, 16);
                        } else if (rule->flags == TRANSPORT) {
                                APP_CHECK(0, status, "unrecognized "
                                        "input \"%s\"", tokens[ti]);
                                return;
                        }

                        dst_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "type") == 0) {
                        APP_CHECK_PRESENCE(type_p, tokens[ti], status);
                        if (status->status < 0)
                                return;

                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;

                        if (strcmp(tokens[ti], "inline-crypto-offload") == 0)
                                rule->type =
                                        RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO;
                        else if (strcmp(tokens[ti],
                                        "inline-protocol-offload") == 0)
                                rule->type =
                                RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL;
                        else if (strcmp(tokens[ti],
                                        "lookaside-protocol-offload") == 0)
                                rule->type =
                                RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL;
                        else if (strcmp(tokens[ti], "no-offload") == 0)
                                rule->type = RTE_SECURITY_ACTION_TYPE_NONE;
                        else {
                                APP_CHECK(0, status, "Invalid input \"%s\"",
                                                tokens[ti]);
                                return;
                        }

                        type_p = 1;
                        continue;
                }

                if (strcmp(tokens[ti], "port_id") == 0) {
                        APP_CHECK_PRESENCE(portid_p, tokens[ti], status);
                        if (status->status < 0)
                                return;
                        INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
                        if (status->status < 0)
                                return;
                        rule->portid = atoi(tokens[ti]);
                        if (status->status < 0)
                                return;
                        portid_p = 1;
                        continue;
                }

                /* unrecognizeable input */
                APP_CHECK(0, status, "unrecognized input \"%s\"",
                        tokens[ti]);
                return;
        }

        if (aead_algo_p) {
                APP_CHECK(cipher_algo_p == 0, status,
                                "AEAD used, no need for cipher options");
                if (status->status < 0)
                        return;

                APP_CHECK(auth_algo_p == 0, status,
                                "AEAD used, no need for auth options");
                if (status->status < 0)
                        return;
        } else {
                APP_CHECK(cipher_algo_p == 1, status, "missing cipher or AEAD options");
                if (status->status < 0)
                        return;

                APP_CHECK(auth_algo_p == 1, status, "missing auth or AEAD options");
                if (status->status < 0)
                        return;
        }

        APP_CHECK(mode_p == 1, status, "missing mode option");
        if (status->status < 0)
                return;

        if ((rule->type != RTE_SECURITY_ACTION_TYPE_NONE) && (portid_p == 0))
                printf("Missing portid option, falling back to non-offload\n");

        if (!type_p || !portid_p) {
                rule->type = RTE_SECURITY_ACTION_TYPE_NONE;
                rule->portid = -1;
        }

        *ri = *ri + 1;
}

static inline void
print_one_sa_rule(const struct ipsec_sa *sa, int inbound)
{
        uint32_t i;
        uint8_t a, b, c, d;

        printf("\tspi_%s(%3u):", inbound?"in":"out", sa->spi);

        for (i = 0; i < RTE_DIM(cipher_algos); i++) {
                if (cipher_algos[i].algo == sa->cipher_algo &&
                                cipher_algos[i].key_len == sa->cipher_key_len) {
                        printf("%s ", cipher_algos[i].keyword);
                        break;
                }
        }

        for (i = 0; i < RTE_DIM(auth_algos); i++) {
                if (auth_algos[i].algo == sa->auth_algo) {
                        printf("%s ", auth_algos[i].keyword);
                        break;
                }
        }

        for (i = 0; i < RTE_DIM(aead_algos); i++) {
                if (aead_algos[i].algo == sa->aead_algo) {
                        printf("%s ", aead_algos[i].keyword);
                        break;
                }
        }

        printf("mode:");

        switch (sa->flags) {
        case IP4_TUNNEL:
                printf("IP4Tunnel ");
                uint32_t_to_char(sa->src.ip.ip4, &a, &b, &c, &d);
                printf("%hhu.%hhu.%hhu.%hhu ", d, c, b, a);
                uint32_t_to_char(sa->dst.ip.ip4, &a, &b, &c, &d);
                printf("%hhu.%hhu.%hhu.%hhu", d, c, b, a);
                break;
        case IP6_TUNNEL:
                printf("IP6Tunnel ");
                for (i = 0; i < 16; i++) {
                        if (i % 2 && i != 15)
                                printf("%.2x:", sa->src.ip.ip6.ip6_b[i]);
                        else
                                printf("%.2x", sa->src.ip.ip6.ip6_b[i]);
                }
                printf(" ");
                for (i = 0; i < 16; i++) {
                        if (i % 2 && i != 15)
                                printf("%.2x:", sa->dst.ip.ip6.ip6_b[i]);
                        else
                                printf("%.2x", sa->dst.ip.ip6.ip6_b[i]);
                }
                break;
        case TRANSPORT:
                printf("Transport");
                break;
        }
        printf("\n");
}

struct sa_ctx {
        struct ipsec_sa sa[IPSEC_SA_MAX_ENTRIES];
        union {
                struct {
                        struct rte_crypto_sym_xform a;
                        struct rte_crypto_sym_xform b;
                };
        } xf[IPSEC_SA_MAX_ENTRIES];
};

static struct sa_ctx *
sa_create(const char *name, int32_t socket_id)
{
        char s[PATH_MAX];
        struct sa_ctx *sa_ctx;
        uint32_t mz_size;
        const struct rte_memzone *mz;

        snprintf(s, sizeof(s), "%s_%u", name, socket_id);

        /* Create SA array table */
        printf("Creating SA context with %u maximum entries\n",
                        IPSEC_SA_MAX_ENTRIES);

        mz_size = sizeof(struct sa_ctx);
        mz = rte_memzone_reserve(s, mz_size, socket_id,
                        RTE_MEMZONE_1GB | RTE_MEMZONE_SIZE_HINT_ONLY);
        if (mz == NULL) {
                printf("Failed to allocate SA DB memory\n");
                rte_errno = -ENOMEM;
                return NULL;
        }

        sa_ctx = (struct sa_ctx *)mz->addr;

        return sa_ctx;
}

static int
check_eth_dev_caps(uint16_t portid, uint32_t inbound)
{
        struct rte_eth_dev_info dev_info;

        rte_eth_dev_info_get(portid, &dev_info);

        if (inbound) {
                if ((dev_info.rx_offload_capa &
                                DEV_RX_OFFLOAD_SECURITY) == 0) {
                        RTE_LOG(WARNING, PORT,
                                "hardware RX IPSec offload is not supported\n");
                        return -EINVAL;
                }

        } else { /* outbound */
                if ((dev_info.tx_offload_capa &
                                DEV_TX_OFFLOAD_SECURITY) == 0) {
                        RTE_LOG(WARNING, PORT,
                                "hardware TX IPSec offload is not supported\n");
                        return -EINVAL;
                }
        }
        return 0;
}


static int
sa_add_rules(struct sa_ctx *sa_ctx, const struct ipsec_sa entries[],
                uint32_t nb_entries, uint32_t inbound)
{
        struct ipsec_sa *sa;
        uint32_t i, idx;
        uint16_t iv_length;

        for (i = 0; i < nb_entries; i++) {
                idx = SPI2IDX(entries[i].spi);
                sa = &sa_ctx->sa[idx];
                if (sa->spi != 0) {
                        printf("Index %u already in use by SPI %u\n",
                                        idx, sa->spi);
                        return -EINVAL;
                }
                *sa = entries[i];
                sa->seq = 0;

                if (sa->type == RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL ||
                        sa->type == RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO) {
                        if (check_eth_dev_caps(sa->portid, inbound))
                                return -EINVAL;
                }

                sa->direction = (inbound == 1) ?
                                RTE_SECURITY_IPSEC_SA_DIR_INGRESS :
                                RTE_SECURITY_IPSEC_SA_DIR_EGRESS;

                switch (sa->flags) {
                case IP4_TUNNEL:
                        sa->src.ip.ip4 = rte_cpu_to_be_32(sa->src.ip.ip4);
                        sa->dst.ip.ip4 = rte_cpu_to_be_32(sa->dst.ip.ip4);
                }

                if (sa->aead_algo == RTE_CRYPTO_AEAD_AES_GCM) {
                        iv_length = 16;

                        sa_ctx->xf[idx].a.type = RTE_CRYPTO_SYM_XFORM_AEAD;
                        sa_ctx->xf[idx].a.aead.algo = sa->aead_algo;
                        sa_ctx->xf[idx].a.aead.key.data = sa->cipher_key;
                        sa_ctx->xf[idx].a.aead.key.length =
                                sa->cipher_key_len;
                        sa_ctx->xf[idx].a.aead.op = (inbound == 1) ?
                                RTE_CRYPTO_AEAD_OP_DECRYPT :
                                RTE_CRYPTO_AEAD_OP_ENCRYPT;
                        sa_ctx->xf[idx].a.next = NULL;
                        sa_ctx->xf[idx].a.aead.iv.offset = IV_OFFSET;
                        sa_ctx->xf[idx].a.aead.iv.length = iv_length;
                        sa_ctx->xf[idx].a.aead.aad_length =
                                sa->aad_len;
                        sa_ctx->xf[idx].a.aead.digest_length =
                                sa->digest_len;

                        sa->xforms = &sa_ctx->xf[idx].a;

                        print_one_sa_rule(sa, inbound);
                } else {
                        switch (sa->cipher_algo) {
                        case RTE_CRYPTO_CIPHER_NULL:
                        case RTE_CRYPTO_CIPHER_AES_CBC:
                                iv_length = sa->iv_len;
                                break;
                        case RTE_CRYPTO_CIPHER_AES_CTR:
                                iv_length = 16;
                                break;
                        default:
                                RTE_LOG(ERR, IPSEC_ESP,
                                                "unsupported cipher algorithm %u\n",
                                                sa->cipher_algo);
                                return -EINVAL;
                        }

                        if (inbound) {
                                sa_ctx->xf[idx].b.type = RTE_CRYPTO_SYM_XFORM_CIPHER;
                                sa_ctx->xf[idx].b.cipher.algo = sa->cipher_algo;
                                sa_ctx->xf[idx].b.cipher.key.data = sa->cipher_key;
                                sa_ctx->xf[idx].b.cipher.key.length =
                                        sa->cipher_key_len;
                                sa_ctx->xf[idx].b.cipher.op =
                                        RTE_CRYPTO_CIPHER_OP_DECRYPT;
                                sa_ctx->xf[idx].b.next = NULL;
                                sa_ctx->xf[idx].b.cipher.iv.offset = IV_OFFSET;
                                sa_ctx->xf[idx].b.cipher.iv.length = iv_length;

                                sa_ctx->xf[idx].a.type = RTE_CRYPTO_SYM_XFORM_AUTH;
                                sa_ctx->xf[idx].a.auth.algo = sa->auth_algo;
                                sa_ctx->xf[idx].a.auth.key.data = sa->auth_key;
                                sa_ctx->xf[idx].a.auth.key.length =
                                        sa->auth_key_len;
                                sa_ctx->xf[idx].a.auth.digest_length =
                                        sa->digest_len;
                                sa_ctx->xf[idx].a.auth.op =
                                        RTE_CRYPTO_AUTH_OP_VERIFY;
                        } else { /* outbound */
                                sa_ctx->xf[idx].a.type = RTE_CRYPTO_SYM_XFORM_CIPHER;
                                sa_ctx->xf[idx].a.cipher.algo = sa->cipher_algo;
                                sa_ctx->xf[idx].a.cipher.key.data = sa->cipher_key;
                                sa_ctx->xf[idx].a.cipher.key.length =
                                        sa->cipher_key_len;
                                sa_ctx->xf[idx].a.cipher.op =
                                        RTE_CRYPTO_CIPHER_OP_ENCRYPT;
                                sa_ctx->xf[idx].a.next = NULL;
                                sa_ctx->xf[idx].a.cipher.iv.offset = IV_OFFSET;
                                sa_ctx->xf[idx].a.cipher.iv.length = iv_length;

                                sa_ctx->xf[idx].b.type = RTE_CRYPTO_SYM_XFORM_AUTH;
                                sa_ctx->xf[idx].b.auth.algo = sa->auth_algo;
                                sa_ctx->xf[idx].b.auth.key.data = sa->auth_key;
                                sa_ctx->xf[idx].b.auth.key.length =
                                        sa->auth_key_len;
                                sa_ctx->xf[idx].b.auth.digest_length =
                                        sa->digest_len;
                                sa_ctx->xf[idx].b.auth.op =
                                        RTE_CRYPTO_AUTH_OP_GENERATE;
                        }

                        sa_ctx->xf[idx].a.next = &sa_ctx->xf[idx].b;
                        sa_ctx->xf[idx].b.next = NULL;
                        sa->xforms = &sa_ctx->xf[idx].a;

                        print_one_sa_rule(sa, inbound);
                }
        }

        return 0;
}

static inline int
sa_out_add_rules(struct sa_ctx *sa_ctx, const struct ipsec_sa entries[],
                uint32_t nb_entries)
{
        return sa_add_rules(sa_ctx, entries, nb_entries, 0);
}

static inline int
sa_in_add_rules(struct sa_ctx *sa_ctx, const struct ipsec_sa entries[],
                uint32_t nb_entries)
{
        return sa_add_rules(sa_ctx, entries, nb_entries, 1);
}

void
sa_init(struct socket_ctx *ctx, int32_t socket_id)
{
        const char *name;

        if (ctx == NULL)
                rte_exit(EXIT_FAILURE, "NULL context.\n");

        if (ctx->sa_in != NULL)
                rte_exit(EXIT_FAILURE, "Inbound SA DB for socket %u already "
                                "initialized\n", socket_id);

        if (ctx->sa_out != NULL)
                rte_exit(EXIT_FAILURE, "Outbound SA DB for socket %u already "
                                "initialized\n", socket_id);

        if (nb_sa_in > 0) {
                name = "sa_in";
                ctx->sa_in = sa_create(name, socket_id);
                if (ctx->sa_in == NULL)
                        rte_exit(EXIT_FAILURE, "Error [%d] creating SA "
                                "context %s in socket %d\n", rte_errno,
                                name, socket_id);

                sa_in_add_rules(ctx->sa_in, sa_in, nb_sa_in);
        } else
                RTE_LOG(WARNING, IPSEC, "No SA Inbound rule specified\n");

        if (nb_sa_out > 0) {
                name = "sa_out";
                ctx->sa_out = sa_create(name, socket_id);
                if (ctx->sa_out == NULL)
                        rte_exit(EXIT_FAILURE, "Error [%d] creating SA "
                                "context %s in socket %d\n", rte_errno,
                                name, socket_id);

                sa_out_add_rules(ctx->sa_out, sa_out, nb_sa_out);
        } else
                RTE_LOG(WARNING, IPSEC, "No SA Outbound rule "
                        "specified\n");
}

int
inbound_sa_check(struct sa_ctx *sa_ctx, struct rte_mbuf *m, uint32_t sa_idx)
{
        struct ipsec_mbuf_metadata *priv;

        priv = RTE_PTR_ADD(m, sizeof(struct rte_mbuf));

        return (sa_ctx->sa[sa_idx].spi == priv->sa->spi);
}

static inline void
single_inbound_lookup(struct ipsec_sa *sadb, struct rte_mbuf *pkt,
                struct ipsec_sa **sa_ret)
{
        struct esp_hdr *esp;
        struct ip *ip;
        uint32_t *src4_addr;
        uint8_t *src6_addr;
        struct ipsec_sa *sa;

        *sa_ret = NULL;

        ip = rte_pktmbuf_mtod(pkt, struct ip *);
        if (ip->ip_v == IPVERSION)
                esp = (struct esp_hdr *)(ip + 1);
        else
                esp = (struct esp_hdr *)(((struct ip6_hdr *)ip) + 1);

        if (esp->spi == INVALID_SPI)
                return;

        sa = &sadb[SPI2IDX(rte_be_to_cpu_32(esp->spi))];
        if (rte_be_to_cpu_32(esp->spi) != sa->spi)
                return;

        switch (sa->flags) {
        case IP4_TUNNEL:
                src4_addr = RTE_PTR_ADD(ip, offsetof(struct ip, ip_src));
                if ((ip->ip_v == IPVERSION) &&
                                (sa->src.ip.ip4 == *src4_addr) &&
                                (sa->dst.ip.ip4 == *(src4_addr + 1)))
                        *sa_ret = sa;
                break;
        case IP6_TUNNEL:
                src6_addr = RTE_PTR_ADD(ip, offsetof(struct ip6_hdr, ip6_src));
                if ((ip->ip_v == IP6_VERSION) &&
                                !memcmp(&sa->src.ip.ip6.ip6, src6_addr, 16) &&
                                !memcmp(&sa->dst.ip.ip6.ip6, src6_addr + 16, 16))
                        *sa_ret = sa;
                break;
        case TRANSPORT:
                *sa_ret = sa;
        }
}

void
inbound_sa_lookup(struct sa_ctx *sa_ctx, struct rte_mbuf *pkts[],
                struct ipsec_sa *sa[], uint16_t nb_pkts)
{
        uint32_t i;

        for (i = 0; i < nb_pkts; i++)
                single_inbound_lookup(sa_ctx->sa, pkts[i], &sa[i]);
}

void
outbound_sa_lookup(struct sa_ctx *sa_ctx, uint32_t sa_idx[],
                struct ipsec_sa *sa[], uint16_t nb_pkts)
{
        uint32_t i;

        for (i = 0; i < nb_pkts; i++)
                sa[i] = &sa_ctx->sa[sa_idx[i]];
}