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