release/src-rt-6.x.4708/include/proto/bcmip.h

   1 /*
   2  * Copyright (C) 2012, Broadcom Corporation. All Rights Reserved.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  11  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  13  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  *
  16  * Fundamental constants relating to IP Protocol
  17  *
  18  * $Id: bcmip.h 329791 2012-04-26 22:36:58Z $
  19  */
  20
  21 #ifndef _bcmip_h_
  22 #define _bcmip_h_
  23
  24 #ifndef _TYPEDEFS_H_
  25 #include <typedefs.h>
  26 #endif
  27
  28 /* This marks the start of a packed structure section. */
  29 #include <packed_section_start.h>
  30
  31
  32 /* IPV4 and IPV6 common */
  33 #define IP_VER_OFFSET           0x0     /* offset to version field */
  34 #define IP_VER_MASK             0xf0    /* version mask */
  35 #define IP_VER_SHIFT            4       /* version shift */
  36 #define IP_VER_4                4       /* version number for IPV4 */
  37 #define IP_VER_6                6       /* version number for IPV6 */
  38
  39 #define IP_VER(ip_body) \
  40         ((((uint8 *)(ip_body))[IP_VER_OFFSET] & IP_VER_MASK) >> IP_VER_SHIFT)
  41
  42 #define IP_PROT_ICMP            0x1     /* ICMP protocol */
  43 #define IP_PROT_IGMP            0x2     /* IGMP protocol */
  44 #define IP_PROT_TCP             0x6     /* TCP protocol */
  45 #define IP_PROT_UDP             0x11    /* UDP protocol type */
  46 #define IP_PROT_ICMP6           0x3a    /* ICMPv6 protocol type */
  47
  48 /* IPV4 field offsets */
  49 #define IPV4_VER_HL_OFFSET      0       /* version and ihl byte offset */
  50 #define IPV4_TOS_OFFSET         1       /* type of service offset */
  51 #define IPV4_PKTLEN_OFFSET      2       /* packet length offset */
  52 #define IPV4_PKTFLAG_OFFSET     6       /* more-frag,dont-frag flag offset */
  53 #define IPV4_PROT_OFFSET        9       /* protocol type offset */
  54 #define IPV4_CHKSUM_OFFSET      10      /* IP header checksum offset */
  55 #define IPV4_SRC_IP_OFFSET      12      /* src IP addr offset */
  56 #define IPV4_DEST_IP_OFFSET     16      /* dest IP addr offset */
  57 #define IPV4_OPTIONS_OFFSET     20      /* IP options offset */
  58 #define IPV4_MIN_HEADER_LEN     20      /* Minimum size for an IP header (no options) */
  59
  60 /* IPV4 field decodes */
  61 #define IPV4_VER_MASK           0xf0    /* IPV4 version mask */
  62 #define IPV4_VER_SHIFT          4       /* IPV4 version shift */
  63
  64 #define IPV4_HLEN_MASK          0x0f    /* IPV4 header length mask */
  65 #define IPV4_HLEN(ipv4_body)    (4 * (((uint8 *)(ipv4_body))[IPV4_VER_HL_OFFSET] & IPV4_HLEN_MASK))
  66
  67 #define IPV4_ADDR_LEN           4       /* IPV4 address length */
  68
  69 #define IPV4_ADDR_NULL(a)       ((((uint8 *)(a))[0] | ((uint8 *)(a))[1] | \
  70                                   ((uint8 *)(a))[2] | ((uint8 *)(a))[3]) == 0)
  71
  72 #define IPV4_ADDR_BCAST(a)      ((((uint8 *)(a))[0] & ((uint8 *)(a))[1] & \
  73                                   ((uint8 *)(a))[2] & ((uint8 *)(a))[3]) == 0xff)
  74
  75 #define IPV4_TOS_DSCP_MASK      0xfc    /* DiffServ codepoint mask */
  76 #define IPV4_TOS_DSCP_SHIFT     2       /* DiffServ codepoint shift */
  77
  78 #define IPV4_TOS(ipv4_body)     (((uint8 *)(ipv4_body))[IPV4_TOS_OFFSET])
  79
  80 #define IPV4_TOS_PREC_MASK      0xe0    /* Historical precedence mask */
  81 #define IPV4_TOS_PREC_SHIFT     5       /* Historical precedence shift */
  82
  83 #define IPV4_TOS_LOWDELAY       0x10    /* Lowest delay requested */
  84 #define IPV4_TOS_THROUGHPUT     0x8     /* Best throughput requested */
  85 #define IPV4_TOS_RELIABILITY    0x4     /* Most reliable delivery requested */
  86
  87 #define IPV4_PROT(ipv4_body)    (((uint8 *)(ipv4_body))[IPV4_PROT_OFFSET])
  88
  89 #define IPV4_FRAG_RESV          0x8000  /* Reserved */
  90 #define IPV4_FRAG_DONT          0x4000  /* Don't fragment */
  91 #define IPV4_FRAG_MORE          0x2000  /* More fragments */
  92 #define IPV4_FRAG_OFFSET_MASK   0x1fff  /* Fragment offset */
  93
  94 #define IPV4_ADDR_STR_LEN       16      /* Max IP address length in string format */
  95
  96 /* IPV4 packet formats */
  97 BWL_PRE_PACKED_STRUCT struct ipv4_addr {
  98         uint8   addr[IPV4_ADDR_LEN];
  99 } BWL_POST_PACKED_STRUCT;
 100
 101 BWL_PRE_PACKED_STRUCT struct ipv4_hdr {
 102         uint8   version_ihl;            /* Version and Internet Header Length */
 103         uint8   tos;                    /* Type Of Service */
 104         uint16  tot_len;                /* Number of bytes in packet (max 65535) */
 105         uint16  id;
 106         uint16  frag;                   /* 3 flag bits and fragment offset */
 107         uint8   ttl;                    /* Time To Live */
 108         uint8   prot;                   /* Protocol */
 109         uint16  hdr_chksum;             /* IP header checksum */
 110         uint8   src_ip[IPV4_ADDR_LEN];  /* Source IP Address */
 111         uint8   dst_ip[IPV4_ADDR_LEN];  /* Destination IP Address */
 112 } BWL_POST_PACKED_STRUCT;
 113
 114 /* IPV6 field offsets */
 115 #define IPV6_PAYLOAD_LEN_OFFSET 4       /* payload length offset */
 116 #define IPV6_NEXT_HDR_OFFSET    6       /* next header/protocol offset */
 117 #define IPV6_HOP_LIMIT_OFFSET   7       /* hop limit offset */
 118 #define IPV6_SRC_IP_OFFSET      8       /* src IP addr offset */
 119 #define IPV6_DEST_IP_OFFSET     24      /* dst IP addr offset */
 120
 121 /* IPV6 field decodes */
 122 #define IPV6_TRAFFIC_CLASS(ipv6_body) \
 123         (((((uint8 *)(ipv6_body))[0] & 0x0f) << 4) | \
 124          ((((uint8 *)(ipv6_body))[1] & 0xf0) >> 4))
 125
 126 #define IPV6_FLOW_LABEL(ipv6_body) \
 127         (((((uint8 *)(ipv6_body))[1] & 0x0f) << 16) | \
 128          (((uint8 *)(ipv6_body))[2] << 8) | \
 129          (((uint8 *)(ipv6_body))[3]))
 130
 131 #define IPV6_PAYLOAD_LEN(ipv6_body) \
 132         ((((uint8 *)(ipv6_body))[IPV6_PAYLOAD_LEN_OFFSET + 0] << 8) | \
 133          ((uint8 *)(ipv6_body))[IPV6_PAYLOAD_LEN_OFFSET + 1])
 134
 135 #define IPV6_NEXT_HDR(ipv6_body) \
 136         (((uint8 *)(ipv6_body))[IPV6_NEXT_HDR_OFFSET])
 137
 138 #define IPV6_PROT(ipv6_body)    IPV6_NEXT_HDR(ipv6_body)
 139
 140 #define IPV6_ADDR_LEN           16      /* IPV6 address length */
 141
 142 /* IPV4 TOS or IPV6 Traffic Classifier or 0 */
 143 #define IP_TOS46(ip_body) \
 144         (IP_VER(ip_body) == IP_VER_4 ? IPV4_TOS(ip_body) : \
 145          IP_VER(ip_body) == IP_VER_6 ? IPV6_TRAFFIC_CLASS(ip_body) : 0)
 146
 147 /* IPV6 extension headers (options) */
 148 #define IPV6_EXTHDR_HOP         0
 149 #define IPV6_EXTHDR_ROUTING     43
 150 #define IPV6_EXTHDR_FRAGMENT    44
 151 #define IPV6_EXTHDR_AUTH        51
 152 #define IPV6_EXTHDR_NONE        59
 153 #define IPV6_EXTHDR_DEST        60
 154
 155 #define IPV6_EXTHDR(prot)       (((prot) == IPV6_EXTHDR_HOP) || \
 156                                  ((prot) == IPV6_EXTHDR_ROUTING) || \
 157                                  ((prot) == IPV6_EXTHDR_FRAGMENT) || \
 158                                  ((prot) == IPV6_EXTHDR_AUTH) || \
 159                                  ((prot) == IPV6_EXTHDR_NONE) || \
 160                                  ((prot) == IPV6_EXTHDR_DEST))
 161
 162 #define IPV6_MIN_HLEN           40
 163
 164 #define IPV6_EXTHDR_LEN(eh)     ((((struct ipv6_exthdr *)(eh))->hdrlen + 1) << 3)
 165
 166 BWL_PRE_PACKED_STRUCT struct ipv6_exthdr {
 167         uint8   nexthdr;
 168         uint8   hdrlen;
 169 } BWL_POST_PACKED_STRUCT;
 170
 171 BWL_PRE_PACKED_STRUCT struct ipv6_exthdr_frag {
 172         uint8   nexthdr;
 173         uint8   rsvd;
 174         uint16  frag_off;
 175         uint32  ident;
 176 } BWL_POST_PACKED_STRUCT;
 177
 178 static INLINE int32
 179 ipv6_exthdr_len(uint8 *h, uint8 *proto)
 180 {
 181         uint16 len = 0, hlen;
 182         struct ipv6_exthdr *eh = (struct ipv6_exthdr *)h;
 183
 184         while (IPV6_EXTHDR(eh->nexthdr)) {
 185                 if (eh->nexthdr == IPV6_EXTHDR_NONE)
 186                         return -1;
 187                 else if (eh->nexthdr == IPV6_EXTHDR_FRAGMENT)
 188                         hlen = 8;
 189                 else if (eh->nexthdr == IPV6_EXTHDR_AUTH)
 190                         hlen = (eh->hdrlen + 2) << 2;
 191                 else
 192                         hlen = IPV6_EXTHDR_LEN(eh);
 193
 194                 len += hlen;
 195                 eh = (struct ipv6_exthdr *)(h + len);
 196         }
 197
 198         *proto = eh->nexthdr;
 199         return len;
 200 }
 201
 202 #define IPV4_ISMULTI(a) (((a) & 0xf0000000) == 0xe0000000)
 203
 204 /* This marks the end of a packed structure section. */
 205 #include <packed_section_end.h>
 206
 207 #endif  /* _bcmip_h_ */