net/ipv6/ila/ila.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Copyright (c) 2015 Tom Herbert <tom@herbertland.com>
   4  */
   5
   6 #ifndef __ILA_H
   7 #define __ILA_H
   8
   9 #include <linux/errno.h>
  10 #include <linux/ip.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/socket.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/types.h>
  16 #include <net/checksum.h>
  17 #include <net/genetlink.h>
  18 #include <net/ip.h>
  19 #include <net/protocol.h>
  20 #include <uapi/linux/ila.h>
  21
  22 struct ila_locator {
  23         union {
  24                 __u8            v8[8];
  25                 __be16          v16[4];
  26                 __be32          v32[2];
  27                 __be64          v64;
  28         };
  29 };
  30
  31 struct ila_identifier {
  32         union {
  33                 struct {
  34 #if defined(__LITTLE_ENDIAN_BITFIELD)
  35                         u8 __space:4;
  36                         u8 csum_neutral:1;
  37                         u8 type:3;
  38 #elif defined(__BIG_ENDIAN_BITFIELD)
  39                         u8 type:3;
  40                         u8 csum_neutral:1;
  41                         u8 __space:4;
  42 #else
  43 #error  "Adjust your <asm/byteorder.h> defines"
  44 #endif
  45                         u8 __space2[7];
  46                 };
  47                 __u8            v8[8];
  48                 __be16          v16[4];
  49                 __be32          v32[2];
  50                 __be64          v64;
  51         };
  52 };
  53
  54 #define CSUM_NEUTRAL_FLAG       htonl(0x10000000)
  55
  56 struct ila_addr {
  57         union {
  58                 struct in6_addr addr;
  59                 struct {
  60                         struct ila_locator loc;
  61                         struct ila_identifier ident;
  62                 };
  63         };
  64 };
  65
  66 static inline struct ila_addr *ila_a2i(struct in6_addr *addr)
  67 {
  68         return (struct ila_addr *)addr;
  69 }
  70
  71 static inline bool ila_addr_is_ila(struct ila_addr *iaddr)
  72 {
  73         return (iaddr->ident.type != ILA_ATYPE_IID);
  74 }
  75
  76 struct ila_params {
  77         struct ila_locator locator;
  78         struct ila_locator locator_match;
  79         __wsum csum_diff;
  80         u8 csum_mode;
  81         u8 ident_type;
  82 };
  83
  84 static inline __wsum compute_csum_diff8(const __be32 *from, const __be32 *to)
  85 {
  86         __be32 diff[] = {
  87                 ~from[0], ~from[1], to[0], to[1],
  88         };
  89
  90         return csum_partial(diff, sizeof(diff), 0);
  91 }
  92
  93 static inline bool ila_csum_neutral_set(struct ila_identifier ident)
  94 {
  95         return !!(ident.csum_neutral);
  96 }
  97
  98 void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p,
  99                              bool set_csum_neutral);
 100
 101 void ila_init_saved_csum(struct ila_params *p);
 102
 103 struct ila_net {
 104         struct {
 105                 struct rhashtable rhash_table;
 106                 spinlock_t *locks; /* Bucket locks for entry manipulation */
 107                 unsigned int locks_mask;
 108                 bool hooks_registered;
 109         } xlat;
 110 };
 111
 112 int ila_lwt_init(void);
 113 void ila_lwt_fini(void);
 114
 115 int ila_xlat_init_net(struct net *net);
 116 void ila_xlat_exit_net(struct net *net);
 117
 118 int ila_xlat_nl_cmd_add_mapping(struct sk_buff *skb, struct genl_info *info);
 119 int ila_xlat_nl_cmd_del_mapping(struct sk_buff *skb, struct genl_info *info);
 120 int ila_xlat_nl_cmd_get_mapping(struct sk_buff *skb, struct genl_info *info);
 121 int ila_xlat_nl_cmd_flush(struct sk_buff *skb, struct genl_info *info);
 122 int ila_xlat_nl_dump_start(struct netlink_callback *cb);
 123 int ila_xlat_nl_dump_done(struct netlink_callback *cb);
 124 int ila_xlat_nl_dump(struct sk_buff *skb, struct netlink_callback *cb);
 125
 126 extern unsigned int ila_net_id;
 127
 128 extern struct genl_family ila_nl_family;
 129
 130 #endif /* __ILA_H */