1 /*- 2 * BSD LICENSE 3 * 4 * Copyright(c) 2016 Intel Corporation. All rights reserved. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Intel Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <stdint.h> 35 #include <stdlib.h> 36 #include <sys/types.h> 37 #include <sys/stat.h> 38 #include <netinet/in.h> 39 #include <netinet/ip.h> 40 #include <netinet/ip6.h> 41 #include <fcntl.h> 42 #include <unistd.h> 43 44 #include <rte_common.h> 45 #include <rte_crypto.h> 46 #include <rte_cryptodev.h> 47 #include <rte_random.h> 48 49 #include "ipsec.h" 50 #include "esp.h" 51 #include "ipip.h" 52 53 int 54 esp_inbound(struct rte_mbuf *m, struct ipsec_sa *sa, 55 struct rte_crypto_op *cop) 56 { 57 struct ip *ip4; 58 struct rte_crypto_sym_op *sym_cop; 59 int32_t payload_len, ip_hdr_len; 60 61 RTE_ASSERT(m != NULL); 62 RTE_ASSERT(sa != NULL); 63 RTE_ASSERT(cop != NULL); 64 65 ip4 = rte_pktmbuf_mtod(m, struct ip *); 66 if (likely(ip4->ip_v == IPVERSION)) 67 ip_hdr_len = ip4->ip_hl * 4; 68 else if (ip4->ip_v == IP6_VERSION) 69 /* XXX No option headers supported */ 70 ip_hdr_len = sizeof(struct ip6_hdr); 71 else { 72 RTE_LOG(ERR, IPSEC_ESP, "invalid IP packet type %d\n", 73 ip4->ip_v); 74 return -EINVAL; 75 } 76 77 payload_len = rte_pktmbuf_pkt_len(m) - ip_hdr_len - 78 sizeof(struct esp_hdr) - sa->iv_len - sa->digest_len; 79 80 if ((payload_len & (sa->block_size - 1)) || (payload_len <= 0)) { 81 RTE_LOG_DP(DEBUG, IPSEC_ESP, "payload %d not multiple of %u\n", 82 payload_len, sa->block_size); 83 return -EINVAL; 84 } 85 86 sym_cop = get_sym_cop(cop); 87 88 sym_cop->m_src = m; 89 sym_cop->cipher.data.offset = ip_hdr_len + sizeof(struct esp_hdr) + 90 sa->iv_len; 91 sym_cop->cipher.data.length = payload_len; 92 93 struct cnt_blk *icb; 94 uint8_t *aad; 95 uint8_t *iv = RTE_PTR_ADD(ip4, ip_hdr_len + sizeof(struct esp_hdr)); 96 97 switch (sa->cipher_algo) { 98 case RTE_CRYPTO_CIPHER_NULL: 99 case RTE_CRYPTO_CIPHER_AES_CBC: 100 sym_cop->cipher.iv.data = iv; 101 sym_cop->cipher.iv.phys_addr = rte_pktmbuf_mtophys_offset(m, 102 ip_hdr_len + sizeof(struct esp_hdr)); 103 sym_cop->cipher.iv.length = sa->iv_len; 104 break; 105 case RTE_CRYPTO_CIPHER_AES_CTR: 106 case RTE_CRYPTO_CIPHER_AES_GCM: 107 icb = get_cnt_blk(m); 108 icb->salt = sa->salt; 109 memcpy(&icb->iv, iv, 8); 110 icb->cnt = rte_cpu_to_be_32(1); 111 sym_cop->cipher.iv.data = (uint8_t *)icb; 112 sym_cop->cipher.iv.phys_addr = rte_pktmbuf_mtophys_offset(m, 113 (uint8_t *)icb - rte_pktmbuf_mtod(m, uint8_t *)); 114 sym_cop->cipher.iv.length = 16; 115 break; 116 default: 117 RTE_LOG(ERR, IPSEC_ESP, "unsupported cipher algorithm %u\n", 118 sa->cipher_algo); 119 return -EINVAL; 120 } 121 122 switch (sa->auth_algo) { 123 case RTE_CRYPTO_AUTH_NULL: 124 case RTE_CRYPTO_AUTH_SHA1_HMAC: 125 case RTE_CRYPTO_AUTH_SHA256_HMAC: 126 sym_cop->auth.data.offset = ip_hdr_len; 127 sym_cop->auth.data.length = sizeof(struct esp_hdr) + 128 sa->iv_len + payload_len; 129 break; 130 case RTE_CRYPTO_AUTH_AES_GCM: 131 aad = get_aad(m); 132 memcpy(aad, iv - sizeof(struct esp_hdr), 8); 133 sym_cop->auth.aad.data = aad; 134 sym_cop->auth.aad.phys_addr = rte_pktmbuf_mtophys_offset(m, 135 aad - rte_pktmbuf_mtod(m, uint8_t *)); 136 sym_cop->auth.aad.length = 8; 137 break; 138 default: 139 RTE_LOG(ERR, IPSEC_ESP, "unsupported auth algorithm %u\n", 140 sa->auth_algo); 141 return -EINVAL; 142 } 143 144 sym_cop->auth.digest.data = rte_pktmbuf_mtod_offset(m, void*, 145 rte_pktmbuf_pkt_len(m) - sa->digest_len); 146 sym_cop->auth.digest.phys_addr = rte_pktmbuf_mtophys_offset(m, 147 rte_pktmbuf_pkt_len(m) - sa->digest_len); 148 sym_cop->auth.digest.length = sa->digest_len; 149 150 return 0; 151 } 152 153 int 154 esp_inbound_post(struct rte_mbuf *m, struct ipsec_sa *sa, 155 struct rte_crypto_op *cop) 156 { 157 struct ip *ip4, *ip; 158 struct ip6_hdr *ip6; 159 uint8_t *nexthdr, *pad_len; 160 uint8_t *padding; 161 uint16_t i; 162 163 RTE_ASSERT(m != NULL); 164 RTE_ASSERT(sa != NULL); 165 RTE_ASSERT(cop != NULL); 166 167 if (cop->status != RTE_CRYPTO_OP_STATUS_SUCCESS) { 168 RTE_LOG(ERR, IPSEC_ESP, "failed crypto op\n"); 169 return -1; 170 } 171 172 nexthdr = rte_pktmbuf_mtod_offset(m, uint8_t*, 173 rte_pktmbuf_pkt_len(m) - sa->digest_len - 1); 174 pad_len = nexthdr - 1; 175 176 padding = pad_len - *pad_len; 177 for (i = 0; i < *pad_len; i++) { 178 if (padding[i] != i + 1) { 179 RTE_LOG(ERR, IPSEC_ESP, "invalid padding\n"); 180 return -EINVAL; 181 } 182 } 183 184 if (rte_pktmbuf_trim(m, *pad_len + 2 + sa->digest_len)) { 185 RTE_LOG(ERR, IPSEC_ESP, 186 "failed to remove pad_len + digest\n"); 187 return -EINVAL; 188 } 189 190 if (unlikely(sa->flags == TRANSPORT)) { 191 ip = rte_pktmbuf_mtod(m, struct ip *); 192 ip4 = (struct ip *)rte_pktmbuf_adj(m, 193 sizeof(struct esp_hdr) + sa->iv_len); 194 if (likely(ip->ip_v == IPVERSION)) { 195 memmove(ip4, ip, ip->ip_hl * 4); 196 ip4->ip_p = *nexthdr; 197 ip4->ip_len = htons(rte_pktmbuf_data_len(m)); 198 } else { 199 ip6 = (struct ip6_hdr *)ip4; 200 /* XXX No option headers supported */ 201 memmove(ip6, ip, sizeof(struct ip6_hdr)); 202 ip6->ip6_nxt = *nexthdr; 203 ip6->ip6_plen = htons(rte_pktmbuf_data_len(m)); 204 } 205 } else 206 ipip_inbound(m, sizeof(struct esp_hdr) + sa->iv_len); 207 208 return 0; 209 } 210 211 int 212 esp_outbound(struct rte_mbuf *m, struct ipsec_sa *sa, 213 struct rte_crypto_op *cop) 214 { 215 struct ip *ip4; 216 struct ip6_hdr *ip6; 217 struct esp_hdr *esp = NULL; 218 uint8_t *padding, *new_ip, nlp; 219 struct rte_crypto_sym_op *sym_cop; 220 int32_t i; 221 uint16_t pad_payload_len, pad_len, ip_hdr_len; 222 223 RTE_ASSERT(m != NULL); 224 RTE_ASSERT(sa != NULL); 225 RTE_ASSERT(cop != NULL); 226 227 ip_hdr_len = 0; 228 229 ip4 = rte_pktmbuf_mtod(m, struct ip *); 230 if (likely(ip4->ip_v == IPVERSION)) { 231 if (unlikely(sa->flags == TRANSPORT)) { 232 ip_hdr_len = ip4->ip_hl * 4; 233 nlp = ip4->ip_p; 234 } else 235 nlp = IPPROTO_IPIP; 236 } else if (ip4->ip_v == IP6_VERSION) { 237 if (unlikely(sa->flags == TRANSPORT)) { 238 /* XXX No option headers supported */ 239 ip_hdr_len = sizeof(struct ip6_hdr); 240 ip6 = (struct ip6_hdr *)ip4; 241 nlp = ip6->ip6_nxt; 242 } else 243 nlp = IPPROTO_IPV6; 244 } else { 245 RTE_LOG(ERR, IPSEC_ESP, "invalid IP packet type %d\n", 246 ip4->ip_v); 247 return -EINVAL; 248 } 249 250 /* Padded payload length */ 251 pad_payload_len = RTE_ALIGN_CEIL(rte_pktmbuf_pkt_len(m) - 252 ip_hdr_len + 2, sa->block_size); 253 pad_len = pad_payload_len + ip_hdr_len - rte_pktmbuf_pkt_len(m); 254 255 RTE_ASSERT(sa->flags == IP4_TUNNEL || sa->flags == IP6_TUNNEL || 256 sa->flags == TRANSPORT); 257 258 if (likely(sa->flags == IP4_TUNNEL)) 259 ip_hdr_len = sizeof(struct ip); 260 else if (sa->flags == IP6_TUNNEL) 261 ip_hdr_len = sizeof(struct ip6_hdr); 262 else if (sa->flags != TRANSPORT) { 263 RTE_LOG(ERR, IPSEC_ESP, "Unsupported SA flags: 0x%x\n", 264 sa->flags); 265 return -EINVAL; 266 } 267 268 /* Check maximum packet size */ 269 if (unlikely(ip_hdr_len + sizeof(struct esp_hdr) + sa->iv_len + 270 pad_payload_len + sa->digest_len > IP_MAXPACKET)) { 271 RTE_LOG(ERR, IPSEC_ESP, "ipsec packet is too big\n"); 272 return -EINVAL; 273 } 274 275 padding = (uint8_t *)rte_pktmbuf_append(m, pad_len + sa->digest_len); 276 if (unlikely(padding == NULL)) { 277 RTE_LOG(ERR, IPSEC_ESP, "not enough mbuf trailing space\n"); 278 return -ENOSPC; 279 } 280 rte_prefetch0(padding); 281 282 switch (sa->flags) { 283 case IP4_TUNNEL: 284 ip4 = ip4ip_outbound(m, sizeof(struct esp_hdr) + sa->iv_len, 285 &sa->src, &sa->dst); 286 esp = (struct esp_hdr *)(ip4 + 1); 287 break; 288 case IP6_TUNNEL: 289 ip6 = ip6ip_outbound(m, sizeof(struct esp_hdr) + sa->iv_len, 290 &sa->src, &sa->dst); 291 esp = (struct esp_hdr *)(ip6 + 1); 292 break; 293 case TRANSPORT: 294 new_ip = (uint8_t *)rte_pktmbuf_prepend(m, 295 sizeof(struct esp_hdr) + sa->iv_len); 296 memmove(new_ip, ip4, ip_hdr_len); 297 esp = (struct esp_hdr *)(new_ip + ip_hdr_len); 298 if (likely(ip4->ip_v == IPVERSION)) { 299 ip4 = (struct ip *)new_ip; 300 ip4->ip_p = IPPROTO_ESP; 301 ip4->ip_len = htons(rte_pktmbuf_data_len(m)); 302 } else { 303 ip6 = (struct ip6_hdr *)new_ip; 304 ip6->ip6_nxt = IPPROTO_ESP; 305 ip6->ip6_plen = htons(rte_pktmbuf_data_len(m)); 306 } 307 } 308 309 sa->seq++; 310 esp->spi = rte_cpu_to_be_32(sa->spi); 311 esp->seq = rte_cpu_to_be_32((uint32_t)sa->seq); 312 313 uint64_t *iv = (uint64_t *)(esp + 1); 314 315 sym_cop = get_sym_cop(cop); 316 sym_cop->m_src = m; 317 switch (sa->cipher_algo) { 318 case RTE_CRYPTO_CIPHER_NULL: 319 case RTE_CRYPTO_CIPHER_AES_CBC: 320 memset(iv, 0, sa->iv_len); 321 sym_cop->cipher.data.offset = ip_hdr_len + 322 sizeof(struct esp_hdr); 323 sym_cop->cipher.data.length = pad_payload_len + sa->iv_len; 324 break; 325 case RTE_CRYPTO_CIPHER_AES_CTR: 326 case RTE_CRYPTO_CIPHER_AES_GCM: 327 *iv = sa->seq; 328 sym_cop->cipher.data.offset = ip_hdr_len + 329 sizeof(struct esp_hdr) + sa->iv_len; 330 sym_cop->cipher.data.length = pad_payload_len; 331 break; 332 default: 333 RTE_LOG(ERR, IPSEC_ESP, "unsupported cipher algorithm %u\n", 334 sa->cipher_algo); 335 return -EINVAL; 336 } 337 338 /* Fill pad_len using default sequential scheme */ 339 for (i = 0; i < pad_len - 2; i++) 340 padding[i] = i + 1; 341 padding[pad_len - 2] = pad_len - 2; 342 padding[pad_len - 1] = nlp; 343 344 struct cnt_blk *icb = get_cnt_blk(m); 345 icb->salt = sa->salt; 346 icb->iv = sa->seq; 347 icb->cnt = rte_cpu_to_be_32(1); 348 sym_cop->cipher.iv.data = (uint8_t *)icb; 349 sym_cop->cipher.iv.phys_addr = rte_pktmbuf_mtophys_offset(m, 350 (uint8_t *)icb - rte_pktmbuf_mtod(m, uint8_t *)); 351 sym_cop->cipher.iv.length = 16; 352 353 uint8_t *aad; 354 355 switch (sa->auth_algo) { 356 case RTE_CRYPTO_AUTH_NULL: 357 case RTE_CRYPTO_AUTH_SHA1_HMAC: 358 case RTE_CRYPTO_AUTH_SHA256_HMAC: 359 sym_cop->auth.data.offset = ip_hdr_len; 360 sym_cop->auth.data.length = sizeof(struct esp_hdr) + 361 sa->iv_len + pad_payload_len; 362 break; 363 case RTE_CRYPTO_AUTH_AES_GCM: 364 aad = get_aad(m); 365 memcpy(aad, esp, 8); 366 sym_cop->auth.aad.data = aad; 367 sym_cop->auth.aad.phys_addr = rte_pktmbuf_mtophys_offset(m, 368 aad - rte_pktmbuf_mtod(m, uint8_t *)); 369 sym_cop->auth.aad.length = 8; 370 break; 371 default: 372 RTE_LOG(ERR, IPSEC_ESP, "unsupported auth algorithm %u\n", 373 sa->auth_algo); 374 return -EINVAL; 375 } 376 377 sym_cop->auth.digest.data = rte_pktmbuf_mtod_offset(m, uint8_t *, 378 rte_pktmbuf_pkt_len(m) - sa->digest_len); 379 sym_cop->auth.digest.phys_addr = rte_pktmbuf_mtophys_offset(m, 380 rte_pktmbuf_pkt_len(m) - sa->digest_len); 381 sym_cop->auth.digest.length = sa->digest_len; 382 383 return 0; 384 } 385 386 int 387 esp_outbound_post(struct rte_mbuf *m __rte_unused, 388 struct ipsec_sa *sa __rte_unused, 389 struct rte_crypto_op *cop) 390 { 391 RTE_ASSERT(m != NULL); 392 RTE_ASSERT(sa != NULL); 393 RTE_ASSERT(cop != NULL); 394 395 if (cop->status != RTE_CRYPTO_OP_STATUS_SUCCESS) { 396 RTE_LOG(ERR, IPSEC_ESP, "Failed crypto op\n"); 397 return -1; 398 } 399 400 return 0; 401 } 402