net/ipv6/ila/ila.h

   1 /*
   2  * Copyright (c) 2015 Tom Herbert <tom@herbertland.com>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of
   7  * the License, or (at your option) any later version.
   8  *
   9  */
  10
  11 #ifndef __ILA_H
  12 #define __ILA_H
  13
  14 #include <linux/errno.h>
  15 #include <linux/ip.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/socket.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/types.h>
  21 #include <net/checksum.h>
  22 #include <net/ip.h>
  23 #include <net/protocol.h>
  24 #include <uapi/linux/ila.h>
  25
  26 struct ila_locator {
  27         union {
  28                 __u8            v8[8];
  29                 __be16          v16[4];
  30                 __be32          v32[2];
  31                 __be64          v64;
  32         };
  33 };
  34
  35 struct ila_identifier {
  36         union {
  37                 struct {
  38 #if defined(__LITTLE_ENDIAN_BITFIELD)
  39                         u8 __space:4;
  40                         u8 csum_neutral:1;
  41                         u8 type:3;
  42 #elif defined(__BIG_ENDIAN_BITFIELD)
  43                         u8 type:3;
  44                         u8 csum_neutral:1;
  45                         u8 __space:4;
  46 #else
  47 #error  "Adjust your <asm/byteorder.h> defines"
  48 #endif
  49                         u8 __space2[7];
  50                 };
  51                 __u8            v8[8];
  52                 __be16          v16[4];
  53                 __be32          v32[2];
  54                 __be64          v64;
  55         };
  56 };
  57
  58 enum {
  59         ILA_ATYPE_IID = 0,
  60         ILA_ATYPE_LUID,
  61         ILA_ATYPE_VIRT_V4,
  62         ILA_ATYPE_VIRT_UNI_V6,
  63         ILA_ATYPE_VIRT_MULTI_V6,
  64         ILA_ATYPE_RSVD_1,
  65         ILA_ATYPE_RSVD_2,
  66         ILA_ATYPE_RSVD_3,
  67 };
  68
  69 #define CSUM_NEUTRAL_FLAG       htonl(0x10000000)
  70
  71 struct ila_addr {
  72         union {
  73                 struct in6_addr addr;
  74                 struct {
  75                         struct ila_locator loc;
  76                         struct ila_identifier ident;
  77                 };
  78         };
  79 };
  80
  81 static inline struct ila_addr *ila_a2i(struct in6_addr *addr)
  82 {
  83         return (struct ila_addr *)addr;
  84 }
  85
  86 static inline bool ila_addr_is_ila(struct ila_addr *iaddr)
  87 {
  88         return (iaddr->ident.type != ILA_ATYPE_IID);
  89 }
  90
  91 struct ila_params {
  92         struct ila_locator locator;
  93         struct ila_locator locator_match;
  94         __wsum csum_diff;
  95         u8 csum_mode;
  96 };
  97
  98 static inline __wsum compute_csum_diff8(const __be32 *from, const __be32 *to)
  99 {
 100         __be32 diff[] = {
 101                 ~from[0], ~from[1], to[0], to[1],
 102         };
 103
 104         return csum_partial(diff, sizeof(diff), 0);
 105 }
 106
 107 static inline bool ila_csum_neutral_set(struct ila_identifier ident)
 108 {
 109         return !!(ident.csum_neutral);
 110 }
 111
 112 void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p,
 113                              bool set_csum_neutral);
 114
 115 void ila_init_saved_csum(struct ila_params *p);
 116
 117 int ila_lwt_init(void);
 118 void ila_lwt_fini(void);
 119 int ila_xlat_init(void);
 120 void ila_xlat_fini(void);
 121
 122 #endif /* __ILA_H */