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/*-
* 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;
}
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