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Diffstat (limited to 'examples/ipsec-secgw/esp.c')
| -rw-r--r-- | examples/ipsec-secgw/esp.c | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/examples/ipsec-secgw/esp.c b/examples/ipsec-secgw/esp.c new file mode 100644 index 00000000..19273807 --- /dev/null +++ b/examples/ipsec-secgw/esp.c @@ -0,0 +1,251 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2016 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <stdint.h> +#include <stdlib.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <netinet/in.h> +#include <netinet/ip.h> +#include <fcntl.h> +#include <unistd.h> + +#include <rte_common.h> +#include <rte_memcpy.h> +#include <rte_crypto.h> +#include <rte_cryptodev.h> +#include <rte_random.h> + +#include "ipsec.h" +#include "esp.h" +#include "ipip.h" + +#define IP_ESP_HDR_SZ (sizeof(struct ip) + sizeof(struct esp_hdr)) + +static inline void +random_iv_u64(uint64_t *buf, uint16_t n) +{ + unsigned left = n & 0x7; + unsigned i; + + IPSEC_ASSERT((n & 0x3) == 0); + + for (i = 0; i < (n >> 3); i++) + buf[i] = rte_rand(); + + if (left) + *((uint32_t *)&buf[i]) = (uint32_t)lrand48(); +} + +/* IPv4 Tunnel */ +int +esp4_tunnel_inbound_pre_crypto(struct rte_mbuf *m, struct ipsec_sa *sa, + struct rte_crypto_op *cop) +{ + int32_t payload_len; + struct rte_crypto_sym_op *sym_cop; + + IPSEC_ASSERT(m != NULL); + IPSEC_ASSERT(sa != NULL); + IPSEC_ASSERT(cop != NULL); + + payload_len = rte_pktmbuf_pkt_len(m) - IP_ESP_HDR_SZ - sa->iv_len - + sa->digest_len; + + if ((payload_len & (sa->block_size - 1)) || (payload_len <= 0)) { + IPSEC_LOG(DEBUG, IPSEC_ESP, "payload %d not multiple of %u\n", + payload_len, sa->block_size); + return -EINVAL; + } + + sym_cop = (struct rte_crypto_sym_op *)(cop + 1); + + sym_cop->m_src = m; + sym_cop->cipher.data.offset = IP_ESP_HDR_SZ + sa->iv_len; + sym_cop->cipher.data.length = payload_len; + + sym_cop->cipher.iv.data = rte_pktmbuf_mtod_offset(m, void*, + IP_ESP_HDR_SZ); + sym_cop->cipher.iv.phys_addr = rte_pktmbuf_mtophys_offset(m, + IP_ESP_HDR_SZ); + sym_cop->cipher.iv.length = sa->iv_len; + + sym_cop->auth.data.offset = sizeof(struct ip); + if (sa->auth_algo == RTE_CRYPTO_AUTH_AES_GCM) + sym_cop->auth.data.length = sizeof(struct esp_hdr); + else + sym_cop->auth.data.length = sizeof(struct esp_hdr) + + sa->iv_len + payload_len; + + sym_cop->auth.digest.data = rte_pktmbuf_mtod_offset(m, void*, + rte_pktmbuf_pkt_len(m) - sa->digest_len); + sym_cop->auth.digest.phys_addr = rte_pktmbuf_mtophys_offset(m, + rte_pktmbuf_pkt_len(m) - sa->digest_len); + sym_cop->auth.digest.length = sa->digest_len; + + return 0; +} + +int +esp4_tunnel_inbound_post_crypto(struct rte_mbuf *m, struct ipsec_sa *sa, + struct rte_crypto_op *cop) +{ + uint8_t *nexthdr, *pad_len; + uint8_t *padding; + uint16_t i; + + IPSEC_ASSERT(m != NULL); + IPSEC_ASSERT(sa != NULL); + IPSEC_ASSERT(cop != NULL); + + if (cop->status != RTE_CRYPTO_OP_STATUS_SUCCESS) { + IPSEC_LOG(ERR, IPSEC_ESP, "Failed crypto op\n"); + return -1; + } + + nexthdr = rte_pktmbuf_mtod_offset(m, uint8_t*, + rte_pktmbuf_pkt_len(m) - sa->digest_len - 1); + pad_len = nexthdr - 1; + + padding = pad_len - *pad_len; + for (i = 0; i < *pad_len; i++) { + if (padding[i] != i) { + IPSEC_LOG(ERR, IPSEC_ESP, "invalid pad_len field\n"); + return -EINVAL; + } + } + + if (rte_pktmbuf_trim(m, *pad_len + 2 + sa->digest_len)) { + IPSEC_LOG(ERR, IPSEC_ESP, + "failed to remove pad_len + digest\n"); + return -EINVAL; + } + + return ip4ip_inbound(m, sizeof(struct esp_hdr) + sa->iv_len); +} + +int +esp4_tunnel_outbound_pre_crypto(struct rte_mbuf *m, struct ipsec_sa *sa, + struct rte_crypto_op *cop) +{ + uint16_t pad_payload_len, pad_len; + struct ip *ip; + struct esp_hdr *esp; + int i; + char *padding; + struct rte_crypto_sym_op *sym_cop; + + IPSEC_ASSERT(m != NULL); + IPSEC_ASSERT(sa != NULL); + IPSEC_ASSERT(cop != NULL); + + /* Payload length */ + pad_payload_len = RTE_ALIGN_CEIL(rte_pktmbuf_pkt_len(m) + 2, + sa->block_size); + pad_len = pad_payload_len - rte_pktmbuf_pkt_len(m); + + rte_prefetch0(rte_pktmbuf_mtod_offset(m, void *, + rte_pktmbuf_pkt_len(m))); + + /* Check maximum packet size */ + if (unlikely(IP_ESP_HDR_SZ + sa->iv_len + pad_payload_len + + sa->digest_len > IP_MAXPACKET)) { + IPSEC_LOG(DEBUG, IPSEC_ESP, "ipsec packet is too big\n"); + return -EINVAL; + } + + padding = rte_pktmbuf_append(m, pad_len + sa->digest_len); + + IPSEC_ASSERT(padding != NULL); + + ip = ip4ip_outbound(m, sizeof(struct esp_hdr) + sa->iv_len, + sa->src, sa->dst); + + esp = (struct esp_hdr *)(ip + 1); + esp->spi = sa->spi; + esp->seq = htonl(sa->seq++); + + IPSEC_LOG(DEBUG, IPSEC_ESP, "pktlen %u\n", rte_pktmbuf_pkt_len(m)); + + /* Fill pad_len using default sequential scheme */ + for (i = 0; i < pad_len - 2; i++) + padding[i] = i + 1; + + padding[pad_len - 2] = pad_len - 2; + padding[pad_len - 1] = IPPROTO_IPIP; + + sym_cop = (struct rte_crypto_sym_op *)(cop + 1); + + sym_cop->m_src = m; + sym_cop->cipher.data.offset = IP_ESP_HDR_SZ + sa->iv_len; + sym_cop->cipher.data.length = pad_payload_len; + + sym_cop->cipher.iv.data = rte_pktmbuf_mtod_offset(m, uint8_t *, + IP_ESP_HDR_SZ); + sym_cop->cipher.iv.phys_addr = rte_pktmbuf_mtophys_offset(m, + IP_ESP_HDR_SZ); + sym_cop->cipher.iv.length = sa->iv_len; + + sym_cop->auth.data.offset = sizeof(struct ip); + sym_cop->auth.data.length = sizeof(struct esp_hdr) + sa->iv_len + + pad_payload_len; + + sym_cop->auth.digest.data = rte_pktmbuf_mtod_offset(m, uint8_t *, + IP_ESP_HDR_SZ + sa->iv_len + pad_payload_len); + sym_cop->auth.digest.phys_addr = rte_pktmbuf_mtophys_offset(m, + IP_ESP_HDR_SZ + sa->iv_len + pad_payload_len); + sym_cop->auth.digest.length = sa->digest_len; + + if (sa->cipher_algo == RTE_CRYPTO_CIPHER_AES_CBC) + random_iv_u64((uint64_t *)sym_cop->cipher.iv.data, + sym_cop->cipher.iv.length); + + return 0; +} + +int +esp4_tunnel_outbound_post_crypto(struct rte_mbuf *m __rte_unused, + struct ipsec_sa *sa __rte_unused, + struct rte_crypto_op *cop) +{ + IPSEC_ASSERT(m != NULL); + IPSEC_ASSERT(sa != NULL); + IPSEC_ASSERT(cop != NULL); + + if (cop->status != RTE_CRYPTO_OP_STATUS_SUCCESS) { + IPSEC_LOG(ERR, IPSEC_ESP, "Failed crypto op\n"); + return -1; + } + + return 0; +} |