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(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 sym_cop->auth.data.offset = ip_hdr_len; 126 sym_cop->auth.data.length = sizeof(struct esp_hdr) + 127 sa->iv_len + payload_len; 128 break; 129 case RTE_CRYPTO_AUTH_AES_GCM: 130 aad = get_aad(m); 131 memcpy(aad, iv - sizeof(struct esp_hdr), 8); 132 sym_cop->auth.aad.data = aad; 133 sym_cop->auth.aad.phys_addr = rte_pktmbuf_mtophys_offset(m, 134 aad - rte_pktmbuf_mtod(m, uint8_t *)); 135 sym_cop->auth.aad.length = 8; 136 break; 137 default: 138 RTE_LOG(ERR, IPSEC_ESP, "unsupported auth algorithm %u\n", 139 sa->auth_algo); 140 return -EINVAL; 141 } 142 143 sym_cop->auth.digest.data = rte_pktmbuf_mtod_offset(m, void*, 144 rte_pktmbuf_pkt_len(m) - sa->digest_len); 145 sym_cop->auth.digest.phys_addr = rte_pktmbuf_mtophys_offset(m, 146 rte_pktmbuf_pkt_len(m) - sa->digest_len); 147 sym_cop->auth.digest.length = sa->digest_len; 148 149 return 0; 150 } 151 152 int 153 esp_inbound_post(struct rte_mbuf *m, struct ipsec_sa *sa, 154 struct rte_crypto_op *cop) 155 { 156 struct ip *ip4, *ip; 157 struct ip6_hdr *ip6; 158 uint8_t *nexthdr, *pad_len; 159 uint8_t *padding; 160 uint16_t i; 161 162 RTE_ASSERT(m != NULL); 163 RTE_ASSERT(sa != NULL); 164 RTE_ASSERT(cop != NULL); 165 166 if (cop->status != RTE_CRYPTO_OP_STATUS_SUCCESS) { 167 RTE_LOG(ERR, IPSEC_ESP, "failed crypto op\n"); 168 return -1; 169 } 170 171 nexthdr = rte_pktmbuf_mtod_offset(m, uint8_t*, 172 rte_pktmbuf_pkt_len(m) - sa->digest_len - 1); 173 pad_len = nexthdr - 1; 174 175 padding = pad_len - *pad_len; 176 for (i = 0; i < *pad_len; i++) { 177 if (padding[i] != i + 1) { 178 RTE_LOG(ERR, IPSEC_ESP, "invalid padding\n"); 179 return -EINVAL; 180 } 181 } 182 183 if (rte_pktmbuf_trim(m, *pad_len + 2 + sa->digest_len)) { 184 RTE_LOG(ERR, IPSEC_ESP, 185 "failed to remove pad_len + digest\n"); 186 return -EINVAL; 187 } 188 189 if (unlikely(sa->flags == TRANSPORT)) { 190 ip = rte_pktmbuf_mtod(m, struct ip *); 191 ip4 = (struct ip *)rte_pktmbuf_adj(m, 192 sizeof(struct esp_hdr) + sa->iv_len); 193 if (likely(ip->ip_v == IPVERSION)) { 194 memmove(ip4, ip, ip->ip_hl * 4); 195 ip4->ip_p = *nexthdr; 196 ip4->ip_len = htons(rte_pktmbuf_data_len(m)); 197 } else { 198 ip6 = (struct ip6_hdr *)ip4; 199 /* XXX No option headers supported */ 200 memmove(ip6, ip, sizeof(struct ip6_hdr)); 201 ip6->ip6_nxt = *nexthdr; 202 ip6->ip6_plen = htons(rte_pktmbuf_data_len(m)); 203 } 204 } else 205 ipip_inbound(m, sizeof(struct esp_hdr) + sa->iv_len); 206 207 return 0; 208 } 209 210 int 211 esp_outbound(struct rte_mbuf *m, struct ipsec_sa *sa, 212 struct rte_crypto_op *cop) 213 { 214 struct ip *ip4; 215 struct ip6_hdr *ip6; 216 struct esp_hdr *esp = NULL; 217 uint8_t *padding, *new_ip, nlp; 218 struct rte_crypto_sym_op *sym_cop; 219 int32_t i; 220 uint16_t pad_payload_len, pad_len, ip_hdr_len; 221 222 RTE_ASSERT(m != NULL); 223 RTE_ASSERT(sa != NULL); 224 RTE_ASSERT(cop != NULL); 225 226 ip_hdr_len = 0; 227 228 ip4 = rte_pktmbuf_mtod(m, struct ip *); 229 if (likely(ip4->ip_v == IPVERSION)) { 230 if (unlikely(sa->flags == TRANSPORT)) { 231 ip_hdr_len = ip4->ip_hl * 4; 232 nlp = ip4->ip_p; 233 } else 234 nlp = IPPROTO_IPIP; 235 } else if (ip4->ip_v == IP6_VERSION) { 236 if (unlikely(sa->flags == TRANSPORT)) { 237 /* XXX No option headers supported */ 238 ip_hdr_len = sizeof(struct ip6_hdr); 239 ip6 = (struct ip6_hdr *)ip4; 240 nlp = ip6->ip6_nxt; 241 } else 242 nlp = IPPROTO_IPV6; 243 } else { 244 RTE_LOG(ERR, IPSEC_ESP, "invalid IP packet type %d\n", 245 ip4->ip_v); 246 return -EINVAL; 247 } 248 249 /* Padded payload length */ 250 pad_payload_len = RTE_ALIGN_CEIL(rte_pktmbuf_pkt_len(m) - 251 ip_hdr_len + 2, sa->block_size); 252 pad_len = pad_payload_len + ip_hdr_len - rte_pktmbuf_pkt_len(m); 253 254 RTE_ASSERT(sa->flags == IP4_TUNNEL || sa->flags == IP6_TUNNEL || 255 sa->flags == TRANSPORT); 256 257 if (likely(sa->flags == IP4_TUNNEL)) 258 ip_hdr_len = sizeof(struct ip); 259 else if (sa->flags == IP6_TUNNEL) 260 ip_hdr_len = sizeof(struct ip6_hdr); 261 else if (sa->flags != TRANSPORT) { 262 RTE_LOG(ERR, IPSEC_ESP, "Unsupported SA flags: 0x%x\n", 263 sa->flags); 264 return -EINVAL; 265 } 266 267 /* Check maximum packet size */ 268 if (unlikely(ip_hdr_len + sizeof(struct esp_hdr) + sa->iv_len + 269 pad_payload_len + sa->digest_len > IP_MAXPACKET)) { 270 RTE_LOG(ERR, IPSEC_ESP, "ipsec packet is too big\n"); 271 return -EINVAL; 272 } 273 274 padding = (uint8_t *)rte_pktmbuf_append(m, pad_len + sa->digest_len); 275 if (unlikely(padding == NULL)) { 276 RTE_LOG(ERR, IPSEC_ESP, "not enough mbuf trailing space\n"); 277 return -ENOSPC; 278 } 279 rte_prefetch0(padding); 280 281 switch (sa->flags) { 282 case IP4_TUNNEL: 283 ip4 = ip4ip_outbound(m, sizeof(struct esp_hdr) + sa->iv_len, 284 &sa->src, &sa->dst); 285 esp = (struct esp_hdr *)(ip4 + 1); 286 break; 287 case IP6_TUNNEL: 288 ip6 = ip6ip_outbound(m, sizeof(struct esp_hdr) + sa->iv_len, 289 &sa->src, &sa->dst); 290 esp = (struct esp_hdr *)(ip6 + 1); 291 break; 292 case TRANSPORT: 293 new_ip = (uint8_t *)rte_pktmbuf_prepend(m, 294 sizeof(struct esp_hdr) + sa->iv_len); 295 memmove(new_ip, ip4, ip_hdr_len); 296 esp = (struct esp_hdr *)(new_ip + ip_hdr_len); 297 if (likely(ip4->ip_v == IPVERSION)) { 298 ip4 = (struct ip *)new_ip; 299 ip4->ip_p = IPPROTO_ESP; 300 ip4->ip_len = htons(rte_pktmbuf_data_len(m)); 301 } else { 302 ip6 = (struct ip6_hdr *)new_ip; 303 ip6->ip6_nxt = IPPROTO_ESP; 304 ip6->ip6_plen = htons(rte_pktmbuf_data_len(m)); 305 } 306 } 307 308 sa->seq++; 309 esp->spi = rte_cpu_to_be_32(sa->spi); 310 esp->seq = rte_cpu_to_be_32((uint32_t)sa->seq); 311 312 uint64_t *iv = (uint64_t *)(esp + 1); 313 314 sym_cop = get_sym_cop(cop); 315 sym_cop->m_src = m; 316 switch (sa->cipher_algo) { 317 case RTE_CRYPTO_CIPHER_NULL: 318 case RTE_CRYPTO_CIPHER_AES_CBC: 319 memset(iv, 0, sa->iv_len); 320 sym_cop->cipher.data.offset = ip_hdr_len + 321 sizeof(struct esp_hdr); 322 sym_cop->cipher.data.length = pad_payload_len + sa->iv_len; 323 break; 324 case RTE_CRYPTO_CIPHER_AES_CTR: 325 case RTE_CRYPTO_CIPHER_AES_GCM: 326 *iv = sa->seq; 327 sym_cop->cipher.data.offset = ip_hdr_len + 328 sizeof(struct esp_hdr) + sa->iv_len; 329 sym_cop->cipher.data.length = pad_payload_len; 330 break; 331 default: 332 RTE_LOG(ERR, IPSEC_ESP, "unsupported cipher algorithm %u\n", 333 sa->cipher_algo); 334 return -EINVAL; 335 } 336 337 /* Fill pad_len using default sequential scheme */ 338 for (i = 0; i < pad_len - 2; i++) 339 padding[i] = i + 1; 340 padding[pad_len - 2] = pad_len - 2; 341 padding[pad_len - 1] = nlp; 342 343 struct cnt_blk *icb = get_cnt_blk(m); 344 icb->salt = sa->salt; 345 icb->iv = sa->seq; 346 icb->cnt = rte_cpu_to_be_32(1); 347 sym_cop->cipher.iv.data = (uint8_t *)icb; 348 sym_cop->cipher.iv.phys_addr = rte_pktmbuf_mtophys_offset(m, 349 (uint8_t *)icb - rte_pktmbuf_mtod(m, uint8_t *)); 350 sym_cop->cipher.iv.length = 16; 351 352 uint8_t *aad; 353 354 switch (sa->auth_algo) { 355 case RTE_CRYPTO_AUTH_NULL: 356 case RTE_CRYPTO_AUTH_SHA1_HMAC: 357 sym_cop->auth.data.offset = ip_hdr_len; 358 sym_cop->auth.data.length = sizeof(struct esp_hdr) + 359 sa->iv_len + pad_payload_len; 360 break; 361 case RTE_CRYPTO_AUTH_AES_GCM: 362 aad = get_aad(m); 363 memcpy(aad, esp, 8); 364 sym_cop->auth.aad.data = aad; 365 sym_cop->auth.aad.phys_addr = rte_pktmbuf_mtophys_offset(m, 366 aad - rte_pktmbuf_mtod(m, uint8_t *)); 367 sym_cop->auth.aad.length = 8; 368 break; 369 default: 370 RTE_LOG(ERR, IPSEC_ESP, "unsupported auth algorithm %u\n", 371 sa->auth_algo); 372 return -EINVAL; 373 } 374 375 sym_cop->auth.digest.data = rte_pktmbuf_mtod_offset(m, uint8_t *, 376 rte_pktmbuf_pkt_len(m) - sa->digest_len); 377 sym_cop->auth.digest.phys_addr = rte_pktmbuf_mtophys_offset(m, 378 rte_pktmbuf_pkt_len(m) - sa->digest_len); 379 sym_cop->auth.digest.length = sa->digest_len; 380 381 return 0; 382 } 383 384 int 385 esp_outbound_post(struct rte_mbuf *m __rte_unused, 386 struct ipsec_sa *sa __rte_unused, 387 struct rte_crypto_op *cop) 388 { 389 RTE_ASSERT(m != NULL); 390 RTE_ASSERT(sa != NULL); 391 RTE_ASSERT(cop != NULL); 392 393 if (cop->status != RTE_CRYPTO_OP_STATUS_SUCCESS) { 394 RTE_LOG(ERR, IPSEC_ESP, "Failed crypto op\n"); 395 return -1; 396 } 397 398 return 0; 399 } 400