ceph/src/dpdk/lib/librte_net/rte_ip.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   Copyright 2014 6WIND S.A.
   6  *   All rights reserved.
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   8  *   Redistribution and use in source and binary forms, with or without
   9  *   modification, are permitted provided that the following conditions
  10  *   are met:
  11  *
  12  *     * Redistributions of source code must retain the above copyright
  13  *       notice, this list of conditions and the following disclaimer.
  14  *     * Redistributions in binary form must reproduce the above copyright
  15  *       notice, this list of conditions and the following disclaimer in
  16  *       the documentation and/or other materials provided with the
  17  *       distribution.
  18  *     * Neither the name of Intel Corporation nor the names of its
  19  *       contributors may be used to endorse or promote products derived
  20  *       from this software without specific prior written permission.
  21  *
  22  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  25  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  26  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  27  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  28  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  32  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 /*
  36  * Copyright (c) 1982, 1986, 1990, 1993
  37  *      The Regents of the University of California.  All rights reserved.
  38  *
  39  * Redistribution and use in source and binary forms, with or without
  40  * modification, are permitted provided that the following conditions
  41  * are met:
  42  * 1. Redistributions of source code must retain the above copyright
  43  *    notice, this list of conditions and the following disclaimer.
  44  * 2. Redistributions in binary form must reproduce the above copyright
  45  *    notice, this list of conditions and the following disclaimer in the
  46  *    documentation and/or other materials provided with the distribution.
  47  * 3. All advertising materials mentioning features or use of this software
  48  *    must display the following acknowledgement:
  49  *      This product includes software developed by the University of
  50  *      California, Berkeley and its contributors.
  51  * 4. Neither the name of the University nor the names of its contributors
  52  *    may be used to endorse or promote products derived from this software
  53  *    without specific prior written permission.
  54  *
  55  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  56  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  57  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  58  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  59  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  60  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  61  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  62  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  63  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  64  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  65  * SUCH DAMAGE.
  66  *
  67  *      @(#)in.h        8.3 (Berkeley) 1/3/94
  68  * $FreeBSD: src/sys/netinet/in.h,v 1.82 2003/10/25 09:37:10 ume Exp $
  69  */
  70
  71 #ifndef _RTE_IP_H_
  72 #define _RTE_IP_H_
  73
  74 /**
  75  * @file
  76  *
  77  * IP-related defines
  78  */
  79
  80 #include <stdint.h>
  81 #include <netinet/in.h>
  82
  83 #include <rte_byteorder.h>
  84 #include <rte_mbuf.h>
  85
  86 #ifdef __cplusplus
  87 extern "C" {
  88 #endif
  89
  90 /**
  91  * IPv4 Header
  92  */
  93 struct ipv4_hdr {
  94         uint8_t  version_ihl;           /**< version and header length */
  95         uint8_t  type_of_service;       /**< type of service */
  96         uint16_t total_length;          /**< length of packet */
  97         uint16_t packet_id;             /**< packet ID */
  98         uint16_t fragment_offset;       /**< fragmentation offset */
  99         uint8_t  time_to_live;          /**< time to live */
 100         uint8_t  next_proto_id;         /**< protocol ID */
 101         uint16_t hdr_checksum;          /**< header checksum */
 102         uint32_t src_addr;              /**< source address */
 103         uint32_t dst_addr;              /**< destination address */
 104 } __attribute__((__packed__));
 105
 106 /** Create IPv4 address */
 107 #define IPv4(a,b,c,d) ((uint32_t)(((a) & 0xff) << 24) | \
 108                                            (((b) & 0xff) << 16) | \
 109                                            (((c) & 0xff) << 8)  | \
 110                                            ((d) & 0xff))
 111
 112 /** Maximal IPv4 packet length (including a header) */
 113 #define IPV4_MAX_PKT_LEN        65535
 114
 115 /** Internet header length mask for version_ihl field */
 116 #define IPV4_HDR_IHL_MASK       (0x0f)
 117 /**
 118  * Internet header length field multiplier (IHL field specifies overall header
 119  * length in number of 4-byte words)
 120  */
 121 #define IPV4_IHL_MULTIPLIER     (4)
 122
 123 /* Fragment Offset * Flags. */
 124 #define IPV4_HDR_DF_SHIFT       14
 125 #define IPV4_HDR_MF_SHIFT       13
 126 #define IPV4_HDR_FO_SHIFT       3
 127
 128 #define IPV4_HDR_DF_FLAG        (1 << IPV4_HDR_DF_SHIFT)
 129 #define IPV4_HDR_MF_FLAG        (1 << IPV4_HDR_MF_SHIFT)
 130
 131 #define IPV4_HDR_OFFSET_MASK    ((1 << IPV4_HDR_MF_SHIFT) - 1)
 132
 133 #define IPV4_HDR_OFFSET_UNITS   8
 134
 135 /*
 136  * IPv4 address types
 137  */
 138 #define IPV4_ANY              ((uint32_t)0x00000000) /**< 0.0.0.0 */
 139 #define IPV4_LOOPBACK         ((uint32_t)0x7f000001) /**< 127.0.0.1 */
 140 #define IPV4_BROADCAST        ((uint32_t)0xe0000000) /**< 224.0.0.0 */
 141 #define IPV4_ALLHOSTS_GROUP   ((uint32_t)0xe0000001) /**< 224.0.0.1 */
 142 #define IPV4_ALLRTRS_GROUP    ((uint32_t)0xe0000002) /**< 224.0.0.2 */
 143 #define IPV4_MAX_LOCAL_GROUP  ((uint32_t)0xe00000ff) /**< 224.0.0.255 */
 144
 145 /*
 146  * IPv4 Multicast-related macros
 147  */
 148 #define IPV4_MIN_MCAST  IPv4(224, 0, 0, 0)          /**< Minimal IPv4-multicast address */
 149 #define IPV4_MAX_MCAST  IPv4(239, 255, 255, 255)    /**< Maximum IPv4 multicast address */
 150
 151 #define IS_IPV4_MCAST(x) \
 152         ((x) >= IPV4_MIN_MCAST && (x) <= IPV4_MAX_MCAST) /**< check if IPv4 address is multicast */
 153
 154 /**
 155  * @internal Calculate a sum of all words in the buffer.
 156  * Helper routine for the rte_raw_cksum().
 157  *
 158  * @param buf
 159  *   Pointer to the buffer.
 160  * @param len
 161  *   Length of the buffer.
 162  * @param sum
 163  *   Initial value of the sum.
 164  * @return
 165  *   sum += Sum of all words in the buffer.
 166  */
 167 static inline uint32_t
 168 __rte_raw_cksum(const void *buf, size_t len, uint32_t sum)
 169 {
 170         /* workaround gcc strict-aliasing warning */
 171         uintptr_t ptr = (uintptr_t)buf;
 172         typedef uint16_t __attribute__((__may_alias__)) u16_p;
 173         const u16_p *u16 = (const u16_p *)ptr;
 174
 175         while (len >= (sizeof(*u16) * 4)) {
 176                 sum += u16[0];
 177                 sum += u16[1];
 178                 sum += u16[2];
 179                 sum += u16[3];
 180                 len -= sizeof(*u16) * 4;
 181                 u16 += 4;
 182         }
 183         while (len >= sizeof(*u16)) {
 184                 sum += *u16;
 185                 len -= sizeof(*u16);
 186                 u16 += 1;
 187         }
 188
 189         /* if length is in odd bytes */
 190         if (len == 1)
 191                 sum += *((const uint8_t *)u16);
 192
 193         return sum;
 194 }
 195
 196 /**
 197  * @internal Reduce a sum to the non-complemented checksum.
 198  * Helper routine for the rte_raw_cksum().
 199  *
 200  * @param sum
 201  *   Value of the sum.
 202  * @return
 203  *   The non-complemented checksum.
 204  */
 205 static inline uint16_t
 206 __rte_raw_cksum_reduce(uint32_t sum)
 207 {
 208         sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
 209         sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
 210         return (uint16_t)sum;
 211 }
 212
 213 /**
 214  * Process the non-complemented checksum of a buffer.
 215  *
 216  * @param buf
 217  *   Pointer to the buffer.
 218  * @param len
 219  *   Length of the buffer.
 220  * @return
 221  *   The non-complemented checksum.
 222  */
 223 static inline uint16_t
 224 rte_raw_cksum(const void *buf, size_t len)
 225 {
 226         uint32_t sum;
 227
 228         sum = __rte_raw_cksum(buf, len, 0);
 229         return __rte_raw_cksum_reduce(sum);
 230 }
 231
 232 /**
 233  * Compute the raw (non complemented) checksum of a packet.
 234  *
 235  * @param m
 236  *   The pointer to the mbuf.
 237  * @param off
 238  *   The offset in bytes to start the checksum.
 239  * @param len
 240  *   The length in bytes of the data to ckecksum.
 241  * @param cksum
 242  *   A pointer to the checksum, filled on success.
 243  * @return
 244  *   0 on success, -1 on error (bad length or offset).
 245  */
 246 static inline int
 247 rte_raw_cksum_mbuf(const struct rte_mbuf *m, uint32_t off, uint32_t len,
 248         uint16_t *cksum)
 249 {
 250         const struct rte_mbuf *seg;
 251         const char *buf;
 252         uint32_t sum, tmp;
 253         uint32_t seglen, done;
 254
 255         /* easy case: all data in the first segment */
 256         if (off + len <= rte_pktmbuf_data_len(m)) {
 257                 *cksum = rte_raw_cksum(rte_pktmbuf_mtod_offset(m,
 258                                 const char *, off), len);
 259                 return 0;
 260         }
 261
 262         if (unlikely(off + len > rte_pktmbuf_pkt_len(m)))
 263                 return -1; /* invalid params, return a dummy value */
 264
 265         /* else browse the segment to find offset */
 266         seglen = 0;
 267         for (seg = m; seg != NULL; seg = seg->next) {
 268                 seglen = rte_pktmbuf_data_len(seg);
 269                 if (off < seglen)
 270                         break;
 271                 off -= seglen;
 272         }
 273         seglen -= off;
 274         buf = rte_pktmbuf_mtod_offset(seg, const char *, off);
 275         if (seglen >= len) {
 276                 /* all in one segment */
 277                 *cksum = rte_raw_cksum(buf, len);
 278                 return 0;
 279         }
 280
 281         /* hard case: process checksum of several segments */
 282         sum = 0;
 283         done = 0;
 284         for (;;) {
 285                 tmp = __rte_raw_cksum(buf, seglen, 0);
 286                 if (done & 1)
 287                         tmp = rte_bswap16(tmp);
 288                 sum += tmp;
 289                 done += seglen;
 290                 if (done == len)
 291                         break;
 292                 seg = seg->next;
 293                 buf = rte_pktmbuf_mtod(seg, const char *);
 294                 seglen = rte_pktmbuf_data_len(seg);
 295                 if (seglen > len - done)
 296                         seglen = len - done;
 297         }
 298
 299         *cksum = __rte_raw_cksum_reduce(sum);
 300         return 0;
 301 }
 302
 303 /**
 304  * Process the IPv4 checksum of an IPv4 header.
 305  *
 306  * The checksum field must be set to 0 by the caller.
 307  *
 308  * @param ipv4_hdr
 309  *   The pointer to the contiguous IPv4 header.
 310  * @return
 311  *   The complemented checksum to set in the IP packet.
 312  */
 313 static inline uint16_t
 314 rte_ipv4_cksum(const struct ipv4_hdr *ipv4_hdr)
 315 {
 316         uint16_t cksum;
 317         cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct ipv4_hdr));
 318         return (cksum == 0xffff) ? cksum : ~cksum;
 319 }
 320
 321 /**
 322  * Process the pseudo-header checksum of an IPv4 header.
 323  *
 324  * The checksum field must be set to 0 by the caller.
 325  *
 326  * Depending on the ol_flags, the pseudo-header checksum expected by the
 327  * drivers is not the same. For instance, when TSO is enabled, the IP
 328  * payload length must not be included in the packet.
 329  *
 330  * When ol_flags is 0, it computes the standard pseudo-header checksum.
 331  *
 332  * @param ipv4_hdr
 333  *   The pointer to the contiguous IPv4 header.
 334  * @param ol_flags
 335  *   The ol_flags of the associated mbuf.
 336  * @return
 337  *   The non-complemented checksum to set in the L4 header.
 338  */
 339 static inline uint16_t
 340 rte_ipv4_phdr_cksum(const struct ipv4_hdr *ipv4_hdr, uint64_t ol_flags)
 341 {
 342         struct ipv4_psd_header {
 343                 uint32_t src_addr; /* IP address of source host. */
 344                 uint32_t dst_addr; /* IP address of destination host. */
 345                 uint8_t  zero;     /* zero. */
 346                 uint8_t  proto;    /* L4 protocol type. */
 347                 uint16_t len;      /* L4 length. */
 348         } psd_hdr;
 349
 350         psd_hdr.src_addr = ipv4_hdr->src_addr;
 351         psd_hdr.dst_addr = ipv4_hdr->dst_addr;
 352         psd_hdr.zero = 0;
 353         psd_hdr.proto = ipv4_hdr->next_proto_id;
 354         if (ol_flags & PKT_TX_TCP_SEG) {
 355                 psd_hdr.len = 0;
 356         } else {
 357                 psd_hdr.len = rte_cpu_to_be_16(
 358                         (uint16_t)(rte_be_to_cpu_16(ipv4_hdr->total_length)
 359                                 - sizeof(struct ipv4_hdr)));
 360         }
 361         return rte_raw_cksum(&psd_hdr, sizeof(psd_hdr));
 362 }
 363
 364 /**
 365  * Process the IPv4 UDP or TCP checksum.
 366  *
 367  * The IPv4 header should not contains options. The IP and layer 4
 368  * checksum must be set to 0 in the packet by the caller.
 369  *
 370  * @param ipv4_hdr
 371  *   The pointer to the contiguous IPv4 header.
 372  * @param l4_hdr
 373  *   The pointer to the beginning of the L4 header.
 374  * @return
 375  *   The complemented checksum to set in the IP packet.
 376  */
 377 static inline uint16_t
 378 rte_ipv4_udptcp_cksum(const struct ipv4_hdr *ipv4_hdr, const void *l4_hdr)
 379 {
 380         uint32_t cksum;
 381         uint32_t l4_len;
 382
 383         l4_len = rte_be_to_cpu_16(ipv4_hdr->total_length) -
 384                 sizeof(struct ipv4_hdr);
 385
 386         cksum = rte_raw_cksum(l4_hdr, l4_len);
 387         cksum += rte_ipv4_phdr_cksum(ipv4_hdr, 0);
 388
 389         cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
 390         cksum = (~cksum) & 0xffff;
 391         if (cksum == 0)
 392                 cksum = 0xffff;
 393
 394         return cksum;
 395 }
 396
 397 /**
 398  * IPv6 Header
 399  */
 400 struct ipv6_hdr {
 401         uint32_t vtc_flow;     /**< IP version, traffic class & flow label. */
 402         uint16_t payload_len;  /**< IP packet length - includes sizeof(ip_header). */
 403         uint8_t  proto;        /**< Protocol, next header. */
 404         uint8_t  hop_limits;   /**< Hop limits. */
 405         uint8_t  src_addr[16]; /**< IP address of source host. */
 406         uint8_t  dst_addr[16]; /**< IP address of destination host(s). */
 407 } __attribute__((__packed__));
 408
 409 /**
 410  * Process the pseudo-header checksum of an IPv6 header.
 411  *
 412  * Depending on the ol_flags, the pseudo-header checksum expected by the
 413  * drivers is not the same. For instance, when TSO is enabled, the IPv6
 414  * payload length must not be included in the packet.
 415  *
 416  * When ol_flags is 0, it computes the standard pseudo-header checksum.
 417  *
 418  * @param ipv6_hdr
 419  *   The pointer to the contiguous IPv6 header.
 420  * @param ol_flags
 421  *   The ol_flags of the associated mbuf.
 422  * @return
 423  *   The non-complemented checksum to set in the L4 header.
 424  */
 425 static inline uint16_t
 426 rte_ipv6_phdr_cksum(const struct ipv6_hdr *ipv6_hdr, uint64_t ol_flags)
 427 {
 428         uint32_t sum;
 429         struct {
 430                 uint32_t len;   /* L4 length. */
 431                 uint32_t proto; /* L4 protocol - top 3 bytes must be zero */
 432         } psd_hdr;
 433
 434         psd_hdr.proto = (ipv6_hdr->proto << 24);
 435         if (ol_flags & PKT_TX_TCP_SEG) {
 436                 psd_hdr.len = 0;
 437         } else {
 438                 psd_hdr.len = ipv6_hdr->payload_len;
 439         }
 440
 441         sum = __rte_raw_cksum(ipv6_hdr->src_addr,
 442                 sizeof(ipv6_hdr->src_addr) + sizeof(ipv6_hdr->dst_addr),
 443                 0);
 444         sum = __rte_raw_cksum(&psd_hdr, sizeof(psd_hdr), sum);
 445         return __rte_raw_cksum_reduce(sum);
 446 }
 447
 448 /**
 449  * Process the IPv6 UDP or TCP checksum.
 450  *
 451  * The IPv4 header should not contains options. The layer 4 checksum
 452  * must be set to 0 in the packet by the caller.
 453  *
 454  * @param ipv6_hdr
 455  *   The pointer to the contiguous IPv6 header.
 456  * @param l4_hdr
 457  *   The pointer to the beginning of the L4 header.
 458  * @return
 459  *   The complemented checksum to set in the IP packet.
 460  */
 461 static inline uint16_t
 462 rte_ipv6_udptcp_cksum(const struct ipv6_hdr *ipv6_hdr, const void *l4_hdr)
 463 {
 464         uint32_t cksum;
 465         uint32_t l4_len;
 466
 467         l4_len = rte_be_to_cpu_16(ipv6_hdr->payload_len);
 468
 469         cksum = rte_raw_cksum(l4_hdr, l4_len);
 470         cksum += rte_ipv6_phdr_cksum(ipv6_hdr, 0);
 471
 472         cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
 473         cksum = (~cksum) & 0xffff;
 474         if (cksum == 0)
 475                 cksum = 0xffff;
 476
 477         return cksum;
 478 }
 479
 480 #ifdef __cplusplus
 481 }
 482 #endif
 483
 484 #endif /* _RTE_IP_H_ */