LXR linux/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
  26struct ila_locator {
  27        union {
  28                __u8            v8[8];
  29                __be16          v16[4];
  30                __be32          v32[2];
  31                __be64          v64;
  32        };
  33};
  34
  35struct 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
  58enum {
  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
  71struct 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
  81static inline struct ila_addr *ila_a2i(struct in6_addr *addr)
  82{
  83        return (struct ila_addr *)addr;
  84}
  85
  86static inline bool ila_addr_is_ila(struct ila_addr *iaddr)
  87{
  88        return (iaddr->ident.type != ILA_ATYPE_IID);
  89}
  90
  91struct ila_params {
  92        struct ila_locator locator;
  93        struct ila_locator locator_match;
  94        __wsum csum_diff;
  95        u8 csum_mode;
  96};
  97
  98static 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
 107static inline bool ila_csum_neutral_set(struct ila_identifier ident)
 108{
 109        return !!(ident.csum_neutral);
 110}
 111
 112void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p,
 113                             bool set_csum_neutral);
 114
 115void ila_init_saved_csum(struct ila_params *p);
 116
 117int ila_lwt_init(void);
 118void ila_lwt_fini(void);
 119int ila_xlat_init(void);
 120void ila_xlat_fini(void);
 121
 122#endif /* __ILA_H */
 123