1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 1982, 1986, 1990, 1993 3 * The Regents of the University of California. 4 * Copyright(c) 2010-2014 Intel Corporation. 5 * Copyright(c) 2014 6WIND S.A. 6 * All rights reserved. 7 */ 8 9 #ifndef _RTE_IP_H_ 10 #define _RTE_IP_H_ 11 12 /** 13 * @file 14 * 15 * IP-related defines 16 */ 17 18 #include <stdint.h> 19 20 #ifdef RTE_EXEC_ENV_WINDOWS 21 #include <ws2tcpip.h> 22 #else 23 #include <sys/socket.h> 24 #include <sys/types.h> 25 #include <netinet/in.h> 26 #include <arpa/inet.h> 27 #include <netinet/ip.h> 28 #include <netinet/ip6.h> 29 #endif 30 31 #include <rte_byteorder.h> 32 #include <rte_mbuf.h> 33 34 #ifdef __cplusplus 35 extern "C" { 36 #endif 37 38 /** 39 * IPv4 Header 40 */ 41 struct rte_ipv4_hdr { 42 __extension__ 43 union { 44 uint8_t version_ihl; /**< version and header length */ 45 struct { 46 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN 47 uint8_t ihl:4; /**< header length */ 48 uint8_t version:4; /**< version */ 49 #elif RTE_BYTE_ORDER == RTE_BIG_ENDIAN 50 uint8_t version:4; /**< version */ 51 uint8_t ihl:4; /**< header length */ 52 #endif 53 }; 54 }; 55 uint8_t type_of_service; /**< type of service */ 56 rte_be16_t total_length; /**< length of packet */ 57 rte_be16_t packet_id; /**< packet ID */ 58 rte_be16_t fragment_offset; /**< fragmentation offset */ 59 uint8_t time_to_live; /**< time to live */ 60 uint8_t next_proto_id; /**< protocol ID */ 61 rte_be16_t hdr_checksum; /**< header checksum */ 62 rte_be32_t src_addr; /**< source address */ 63 rte_be32_t dst_addr; /**< destination address */ 64 } __rte_packed; 65 66 /** Create IPv4 address */ 67 #define RTE_IPV4(a, b, c, d) ((uint32_t)(((a) & 0xff) << 24) | \ 68 (((b) & 0xff) << 16) | \ 69 (((c) & 0xff) << 8) | \ 70 ((d) & 0xff)) 71 72 /** Maximal IPv4 packet length (including a header) */ 73 #define RTE_IPV4_MAX_PKT_LEN 65535 74 75 /** Internet header length mask for version_ihl field */ 76 #define RTE_IPV4_HDR_IHL_MASK (0x0f) 77 /** 78 * Internet header length field multiplier (IHL field specifies overall header 79 * length in number of 4-byte words) 80 */ 81 #define RTE_IPV4_IHL_MULTIPLIER (4) 82 83 /* Type of Service fields */ 84 #define RTE_IPV4_HDR_DSCP_MASK (0xfc) 85 #define RTE_IPV4_HDR_ECN_MASK (0x03) 86 #define RTE_IPV4_HDR_ECN_CE RTE_IPV4_HDR_ECN_MASK 87 88 /* Fragment Offset * Flags. */ 89 #define RTE_IPV4_HDR_DF_SHIFT 14 90 #define RTE_IPV4_HDR_MF_SHIFT 13 91 #define RTE_IPV4_HDR_FO_SHIFT 3 92 93 #define RTE_IPV4_HDR_DF_FLAG (1 << RTE_IPV4_HDR_DF_SHIFT) 94 #define RTE_IPV4_HDR_MF_FLAG (1 << RTE_IPV4_HDR_MF_SHIFT) 95 96 #define RTE_IPV4_HDR_OFFSET_MASK ((1 << RTE_IPV4_HDR_MF_SHIFT) - 1) 97 98 #define RTE_IPV4_HDR_OFFSET_UNITS 8 99 100 /* 101 * IPv4 address types 102 */ 103 #define RTE_IPV4_ANY ((uint32_t)0x00000000) /**< 0.0.0.0 */ 104 #define RTE_IPV4_LOOPBACK ((uint32_t)0x7f000001) /**< 127.0.0.1 */ 105 #define RTE_IPV4_BROADCAST ((uint32_t)0xe0000000) /**< 224.0.0.0 */ 106 #define RTE_IPV4_ALLHOSTS_GROUP ((uint32_t)0xe0000001) /**< 224.0.0.1 */ 107 #define RTE_IPV4_ALLRTRS_GROUP ((uint32_t)0xe0000002) /**< 224.0.0.2 */ 108 #define RTE_IPV4_MAX_LOCAL_GROUP ((uint32_t)0xe00000ff) /**< 224.0.0.255 */ 109 110 /* 111 * IPv4 Multicast-related macros 112 */ 113 #define RTE_IPV4_MIN_MCAST \ 114 RTE_IPV4(224, 0, 0, 0) /**< Minimal IPv4-multicast address */ 115 #define RTE_IPV4_MAX_MCAST \ 116 RTE_IPV4(239, 255, 255, 255) /**< Maximum IPv4 multicast address */ 117 118 #define RTE_IS_IPV4_MCAST(x) \ 119 ((x) >= RTE_IPV4_MIN_MCAST && (x) <= RTE_IPV4_MAX_MCAST) 120 /**< check if IPv4 address is multicast */ 121 122 /* IPv4 default fields values */ 123 #define RTE_IPV4_MIN_IHL (0x5) 124 #define RTE_IPV4_VHL_DEF ((IPVERSION << 4) | RTE_IPV4_MIN_IHL) 125 126 /** 127 * Get the length of an IPv4 header. 128 * 129 * @param ipv4_hdr 130 * Pointer to the IPv4 header. 131 * @return 132 * The length of the IPv4 header (with options if present) in bytes. 133 */ 134 static inline uint8_t 135 rte_ipv4_hdr_len(const struct rte_ipv4_hdr *ipv4_hdr) 136 { 137 return (uint8_t)((ipv4_hdr->version_ihl & RTE_IPV4_HDR_IHL_MASK) * 138 RTE_IPV4_IHL_MULTIPLIER); 139 } 140 141 /** 142 * @internal Calculate a sum of all words in the buffer. 143 * Helper routine for the rte_raw_cksum(). 144 * 145 * @param buf 146 * Pointer to the buffer. 147 * @param len 148 * Length of the buffer. 149 * @param sum 150 * Initial value of the sum. 151 * @return 152 * sum += Sum of all words in the buffer. 153 */ 154 static inline uint32_t 155 __rte_raw_cksum(const void *buf, size_t len, uint32_t sum) 156 { 157 /* extend strict-aliasing rules */ 158 typedef uint16_t __attribute__((__may_alias__)) u16_p; 159 const u16_p *u16_buf = (const u16_p *)buf; 160 const u16_p *end = u16_buf + len / sizeof(*u16_buf); 161 162 for (; u16_buf != end; ++u16_buf) 163 sum += *u16_buf; 164 165 /* if length is odd, keeping it byte order independent */ 166 if (unlikely(len % 2)) { 167 uint16_t left = 0; 168 *(unsigned char *)&left = *(const unsigned char *)end; 169 sum += left; 170 } 171 172 return sum; 173 } 174 175 /** 176 * @internal Reduce a sum to the non-complemented checksum. 177 * Helper routine for the rte_raw_cksum(). 178 * 179 * @param sum 180 * Value of the sum. 181 * @return 182 * The non-complemented checksum. 183 */ 184 static inline uint16_t 185 __rte_raw_cksum_reduce(uint32_t sum) 186 { 187 sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff); 188 sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff); 189 return (uint16_t)sum; 190 } 191 192 /** 193 * Process the non-complemented checksum of a buffer. 194 * 195 * @param buf 196 * Pointer to the buffer. 197 * @param len 198 * Length of the buffer. 199 * @return 200 * The non-complemented checksum. 201 */ 202 static inline uint16_t 203 rte_raw_cksum(const void *buf, size_t len) 204 { 205 uint32_t sum; 206 207 sum = __rte_raw_cksum(buf, len, 0); 208 return __rte_raw_cksum_reduce(sum); 209 } 210 211 /** 212 * Compute the raw (non complemented) checksum of a packet. 213 * 214 * @param m 215 * The pointer to the mbuf. 216 * @param off 217 * The offset in bytes to start the checksum. 218 * @param len 219 * The length in bytes of the data to checksum. 220 * @param cksum 221 * A pointer to the checksum, filled on success. 222 * @return 223 * 0 on success, -1 on error (bad length or offset). 224 */ 225 static inline int 226 rte_raw_cksum_mbuf(const struct rte_mbuf *m, uint32_t off, uint32_t len, 227 uint16_t *cksum) 228 { 229 const struct rte_mbuf *seg; 230 const char *buf; 231 uint32_t sum, tmp; 232 uint32_t seglen, done; 233 234 /* easy case: all data in the first segment */ 235 if (off + len <= rte_pktmbuf_data_len(m)) { 236 *cksum = rte_raw_cksum(rte_pktmbuf_mtod_offset(m, 237 const char *, off), len); 238 return 0; 239 } 240 241 if (unlikely(off + len > rte_pktmbuf_pkt_len(m))) 242 return -1; /* invalid params, return a dummy value */ 243 244 /* else browse the segment to find offset */ 245 seglen = 0; 246 for (seg = m; seg != NULL; seg = seg->next) { 247 seglen = rte_pktmbuf_data_len(seg); 248 if (off < seglen) 249 break; 250 off -= seglen; 251 } 252 RTE_ASSERT(seg != NULL); 253 if (seg == NULL) 254 return -1; 255 seglen -= off; 256 buf = rte_pktmbuf_mtod_offset(seg, const char *, off); 257 if (seglen >= len) { 258 /* all in one segment */ 259 *cksum = rte_raw_cksum(buf, len); 260 return 0; 261 } 262 263 /* hard case: process checksum of several segments */ 264 sum = 0; 265 done = 0; 266 for (;;) { 267 tmp = __rte_raw_cksum(buf, seglen, 0); 268 if (done & 1) 269 tmp = rte_bswap16((uint16_t)tmp); 270 sum += tmp; 271 done += seglen; 272 if (done == len) 273 break; 274 seg = seg->next; 275 buf = rte_pktmbuf_mtod(seg, const char *); 276 seglen = rte_pktmbuf_data_len(seg); 277 if (seglen > len - done) 278 seglen = len - done; 279 } 280 281 *cksum = __rte_raw_cksum_reduce(sum); 282 return 0; 283 } 284 285 /** 286 * Process the IPv4 checksum of an IPv4 header. 287 * 288 * The checksum field must be set to 0 by the caller. 289 * 290 * @param ipv4_hdr 291 * The pointer to the contiguous IPv4 header. 292 * @return 293 * The complemented checksum to set in the IP packet. 294 */ 295 static inline uint16_t 296 rte_ipv4_cksum(const struct rte_ipv4_hdr *ipv4_hdr) 297 { 298 uint16_t cksum; 299 cksum = rte_raw_cksum(ipv4_hdr, rte_ipv4_hdr_len(ipv4_hdr)); 300 return (uint16_t)~cksum; 301 } 302 303 /** 304 * Process the pseudo-header checksum of an IPv4 header. 305 * 306 * The checksum field must be set to 0 by the caller. 307 * 308 * Depending on the ol_flags, the pseudo-header checksum expected by the 309 * drivers is not the same. For instance, when TSO is enabled, the IP 310 * payload length must not be included in the packet. 311 * 312 * When ol_flags is 0, it computes the standard pseudo-header checksum. 313 * 314 * @param ipv4_hdr 315 * The pointer to the contiguous IPv4 header. 316 * @param ol_flags 317 * The ol_flags of the associated mbuf. 318 * @return 319 * The non-complemented checksum to set in the L4 header. 320 */ 321 static inline uint16_t 322 rte_ipv4_phdr_cksum(const struct rte_ipv4_hdr *ipv4_hdr, uint64_t ol_flags) 323 { 324 struct ipv4_psd_header { 325 uint32_t src_addr; /* IP address of source host. */ 326 uint32_t dst_addr; /* IP address of destination host. */ 327 uint8_t zero; /* zero. */ 328 uint8_t proto; /* L4 protocol type. */ 329 uint16_t len; /* L4 length. */ 330 } psd_hdr; 331 332 uint32_t l3_len; 333 334 psd_hdr.src_addr = ipv4_hdr->src_addr; 335 psd_hdr.dst_addr = ipv4_hdr->dst_addr; 336 psd_hdr.zero = 0; 337 psd_hdr.proto = ipv4_hdr->next_proto_id; 338 if (ol_flags & RTE_MBUF_F_TX_TCP_SEG) { 339 psd_hdr.len = 0; 340 } else { 341 l3_len = rte_be_to_cpu_16(ipv4_hdr->total_length); 342 psd_hdr.len = rte_cpu_to_be_16((uint16_t)(l3_len - 343 rte_ipv4_hdr_len(ipv4_hdr))); 344 } 345 return rte_raw_cksum(&psd_hdr, sizeof(psd_hdr)); 346 } 347 348 /** 349 * @internal Calculate the non-complemented IPv4 L4 checksum 350 */ 351 static inline uint16_t 352 __rte_ipv4_udptcp_cksum(const struct rte_ipv4_hdr *ipv4_hdr, const void *l4_hdr) 353 { 354 uint32_t cksum; 355 uint32_t l3_len, l4_len; 356 uint8_t ip_hdr_len; 357 358 ip_hdr_len = rte_ipv4_hdr_len(ipv4_hdr); 359 l3_len = rte_be_to_cpu_16(ipv4_hdr->total_length); 360 if (l3_len < ip_hdr_len) 361 return 0; 362 363 l4_len = l3_len - ip_hdr_len; 364 365 cksum = rte_raw_cksum(l4_hdr, l4_len); 366 cksum += rte_ipv4_phdr_cksum(ipv4_hdr, 0); 367 368 cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff); 369 370 return (uint16_t)cksum; 371 } 372 373 /** 374 * Process the IPv4 UDP or TCP checksum. 375 * 376 * The layer 4 checksum must be set to 0 in the L4 header by the caller. 377 * 378 * @param ipv4_hdr 379 * The pointer to the contiguous IPv4 header. 380 * @param l4_hdr 381 * The pointer to the beginning of the L4 header. 382 * @return 383 * The complemented checksum to set in the L4 header. 384 */ 385 static inline uint16_t 386 rte_ipv4_udptcp_cksum(const struct rte_ipv4_hdr *ipv4_hdr, const void *l4_hdr) 387 { 388 uint16_t cksum = __rte_ipv4_udptcp_cksum(ipv4_hdr, l4_hdr); 389 390 cksum = ~cksum; 391 392 /* 393 * Per RFC 768: If the computed checksum is zero for UDP, 394 * it is transmitted as all ones 395 * (the equivalent in one's complement arithmetic). 396 */ 397 if (cksum == 0 && ipv4_hdr->next_proto_id == IPPROTO_UDP) 398 cksum = 0xffff; 399 400 return cksum; 401 } 402 403 /** 404 * Validate the IPv4 UDP or TCP checksum. 405 * 406 * In case of UDP, the caller must first check if udp_hdr->dgram_cksum is 0 407 * (i.e. no checksum). 408 * 409 * @param ipv4_hdr 410 * The pointer to the contiguous IPv4 header. 411 * @param l4_hdr 412 * The pointer to the beginning of the L4 header. 413 * @return 414 * Return 0 if the checksum is correct, else -1. 415 */ 416 __rte_experimental 417 static inline int 418 rte_ipv4_udptcp_cksum_verify(const struct rte_ipv4_hdr *ipv4_hdr, 419 const void *l4_hdr) 420 { 421 uint16_t cksum = __rte_ipv4_udptcp_cksum(ipv4_hdr, l4_hdr); 422 423 if (cksum != 0xffff) 424 return -1; 425 426 return 0; 427 } 428 429 /** 430 * IPv6 Header 431 */ 432 struct rte_ipv6_hdr { 433 rte_be32_t vtc_flow; /**< IP version, traffic class & flow label. */ 434 rte_be16_t payload_len; /**< IP payload size, including ext. headers */ 435 uint8_t proto; /**< Protocol, next header. */ 436 uint8_t hop_limits; /**< Hop limits. */ 437 uint8_t src_addr[16]; /**< IP address of source host. */ 438 uint8_t dst_addr[16]; /**< IP address of destination host(s). */ 439 } __rte_packed; 440 441 /* IPv6 vtc_flow: IPv / TC / flow_label */ 442 #define RTE_IPV6_HDR_FL_SHIFT 0 443 #define RTE_IPV6_HDR_TC_SHIFT 20 444 #define RTE_IPV6_HDR_FL_MASK ((1u << RTE_IPV6_HDR_TC_SHIFT) - 1) 445 #define RTE_IPV6_HDR_TC_MASK (0xff << RTE_IPV6_HDR_TC_SHIFT) 446 #define RTE_IPV6_HDR_DSCP_MASK (0xfc << RTE_IPV6_HDR_TC_SHIFT) 447 #define RTE_IPV6_HDR_ECN_MASK (0x03 << RTE_IPV6_HDR_TC_SHIFT) 448 #define RTE_IPV6_HDR_ECN_CE RTE_IPV6_HDR_ECN_MASK 449 450 #define RTE_IPV6_MIN_MTU 1280 /**< Minimum MTU for IPv6, see RFC 8200. */ 451 452 /** 453 * Process the pseudo-header checksum of an IPv6 header. 454 * 455 * Depending on the ol_flags, the pseudo-header checksum expected by the 456 * drivers is not the same. For instance, when TSO is enabled, the IPv6 457 * payload length must not be included in the packet. 458 * 459 * When ol_flags is 0, it computes the standard pseudo-header checksum. 460 * 461 * @param ipv6_hdr 462 * The pointer to the contiguous IPv6 header. 463 * @param ol_flags 464 * The ol_flags of the associated mbuf. 465 * @return 466 * The non-complemented checksum to set in the L4 header. 467 */ 468 static inline uint16_t 469 rte_ipv6_phdr_cksum(const struct rte_ipv6_hdr *ipv6_hdr, uint64_t ol_flags) 470 { 471 uint32_t sum; 472 struct { 473 rte_be32_t len; /* L4 length. */ 474 rte_be32_t proto; /* L4 protocol - top 3 bytes must be zero */ 475 } psd_hdr; 476 477 psd_hdr.proto = (uint32_t)(ipv6_hdr->proto << 24); 478 if (ol_flags & RTE_MBUF_F_TX_TCP_SEG) { 479 psd_hdr.len = 0; 480 } else { 481 psd_hdr.len = ipv6_hdr->payload_len; 482 } 483 484 sum = __rte_raw_cksum(ipv6_hdr->src_addr, 485 sizeof(ipv6_hdr->src_addr) + sizeof(ipv6_hdr->dst_addr), 486 0); 487 sum = __rte_raw_cksum(&psd_hdr, sizeof(psd_hdr), sum); 488 return __rte_raw_cksum_reduce(sum); 489 } 490 491 /** 492 * @internal Calculate the non-complemented IPv6 L4 checksum 493 */ 494 static inline uint16_t 495 __rte_ipv6_udptcp_cksum(const struct rte_ipv6_hdr *ipv6_hdr, const void *l4_hdr) 496 { 497 uint32_t cksum; 498 uint32_t l4_len; 499 500 l4_len = rte_be_to_cpu_16(ipv6_hdr->payload_len); 501 502 cksum = rte_raw_cksum(l4_hdr, l4_len); 503 cksum += rte_ipv6_phdr_cksum(ipv6_hdr, 0); 504 505 cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff); 506 507 return (uint16_t)cksum; 508 } 509 510 /** 511 * Process the IPv6 UDP or TCP checksum. 512 * 513 * The IPv6 header must not be followed by extension headers. The layer 4 514 * checksum must be set to 0 in the L4 header by the caller. 515 * 516 * @param ipv6_hdr 517 * The pointer to the contiguous IPv6 header. 518 * @param l4_hdr 519 * The pointer to the beginning of the L4 header. 520 * @return 521 * The complemented checksum to set in the L4 header. 522 */ 523 static inline uint16_t 524 rte_ipv6_udptcp_cksum(const struct rte_ipv6_hdr *ipv6_hdr, const void *l4_hdr) 525 { 526 uint16_t cksum = __rte_ipv6_udptcp_cksum(ipv6_hdr, l4_hdr); 527 528 cksum = ~cksum; 529 530 /* 531 * Per RFC 768: If the computed checksum is zero for UDP, 532 * it is transmitted as all ones 533 * (the equivalent in one's complement arithmetic). 534 */ 535 if (cksum == 0 && ipv6_hdr->proto == IPPROTO_UDP) 536 cksum = 0xffff; 537 538 return cksum; 539 } 540 541 /** 542 * Validate the IPv6 UDP or TCP checksum. 543 * 544 * In case of UDP, the caller must first check if udp_hdr->dgram_cksum is 0: 545 * this is either invalid or means no checksum in some situations. See 8.1 546 * (Upper-Layer Checksums) in RFC 8200. 547 * 548 * @param ipv6_hdr 549 * The pointer to the contiguous IPv6 header. 550 * @param l4_hdr 551 * The pointer to the beginning of the L4 header. 552 * @return 553 * Return 0 if the checksum is correct, else -1. 554 */ 555 __rte_experimental 556 static inline int 557 rte_ipv6_udptcp_cksum_verify(const struct rte_ipv6_hdr *ipv6_hdr, 558 const void *l4_hdr) 559 { 560 uint16_t cksum = __rte_ipv6_udptcp_cksum(ipv6_hdr, l4_hdr); 561 562 if (cksum != 0xffff) 563 return -1; 564 565 return 0; 566 } 567 568 /** IPv6 fragment extension header. */ 569 #define RTE_IPV6_EHDR_MF_SHIFT 0 570 #define RTE_IPV6_EHDR_MF_MASK 1 571 #define RTE_IPV6_EHDR_FO_SHIFT 3 572 #define RTE_IPV6_EHDR_FO_MASK (~((1 << RTE_IPV6_EHDR_FO_SHIFT) - 1)) 573 #define RTE_IPV6_EHDR_FO_ALIGN (1 << RTE_IPV6_EHDR_FO_SHIFT) 574 575 #define RTE_IPV6_FRAG_USED_MASK (RTE_IPV6_EHDR_MF_MASK | RTE_IPV6_EHDR_FO_MASK) 576 577 #define RTE_IPV6_GET_MF(x) ((x) & RTE_IPV6_EHDR_MF_MASK) 578 #define RTE_IPV6_GET_FO(x) ((x) >> RTE_IPV6_EHDR_FO_SHIFT) 579 580 #define RTE_IPV6_SET_FRAG_DATA(fo, mf) \ 581 (((fo) & RTE_IPV6_EHDR_FO_MASK) | ((mf) & RTE_IPV6_EHDR_MF_MASK)) 582 583 struct rte_ipv6_fragment_ext { 584 uint8_t next_header; /**< Next header type */ 585 uint8_t reserved; /**< Reserved */ 586 rte_be16_t frag_data; /**< All fragmentation data */ 587 rte_be32_t id; /**< Packet ID */ 588 } __rte_packed; 589 590 /* IPv6 fragment extension header size */ 591 #define RTE_IPV6_FRAG_HDR_SIZE sizeof(struct rte_ipv6_fragment_ext) 592 593 /** 594 * Parse next IPv6 header extension 595 * 596 * This function checks if proto number is an IPv6 extensions and parses its 597 * data if so, providing information on next header and extension length. 598 * 599 * @param p 600 * Pointer to an extension raw data. 601 * @param proto 602 * Protocol number extracted from the "next header" field from 603 * the IPv6 header or the previous extension. 604 * @param ext_len 605 * Extension data length. 606 * @return 607 * next protocol number if proto is an IPv6 extension, -EINVAL otherwise 608 */ 609 __rte_experimental 610 static inline int 611 rte_ipv6_get_next_ext(const uint8_t *p, int proto, size_t *ext_len) 612 { 613 int next_proto; 614 615 switch (proto) { 616 case IPPROTO_AH: 617 next_proto = *p++; 618 *ext_len = (*p + 2) * sizeof(uint32_t); 619 break; 620 621 case IPPROTO_HOPOPTS: 622 case IPPROTO_ROUTING: 623 case IPPROTO_DSTOPTS: 624 next_proto = *p++; 625 *ext_len = (*p + 1) * sizeof(uint64_t); 626 break; 627 628 case IPPROTO_FRAGMENT: 629 next_proto = *p; 630 *ext_len = RTE_IPV6_FRAG_HDR_SIZE; 631 break; 632 633 default: 634 return -EINVAL; 635 } 636 637 return next_proto; 638 } 639 640 #ifdef __cplusplus 641 } 642 #endif 643 644 #endif /* _RTE_IP_H_ */ 645