drivers/net/wireguard/allowedips.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
   4  */
   5
   6 #ifndef _WG_ALLOWEDIPS_H
   7 #define _WG_ALLOWEDIPS_H
   8
   9 #include <linux/mutex.h>
  10 #include <linux/ip.h>
  11 #include <linux/ipv6.h>
  12
  13 struct wg_peer;
  14
  15 struct allowedips_node {
  16         struct wg_peer __rcu *peer;
  17         struct allowedips_node __rcu *bit[2];
  18         /* While it may seem scandalous that we waste space for v4,
  19          * we're alloc'ing to the nearest power of 2 anyway, so this
  20          * doesn't actually make a difference.
  21          */
  22         u8 bits[16] __aligned(__alignof(u64));
  23         u8 cidr, bit_at_a, bit_at_b, bitlen;
  24
  25         /* Keep rarely used list at bottom to be beyond cache line. */
  26         union {
  27                 struct list_head peer_list;
  28                 struct rcu_head rcu;
  29         };
  30 };
  31
  32 struct allowedips {
  33         struct allowedips_node __rcu *root4;
  34         struct allowedips_node __rcu *root6;
  35         u64 seq;
  36 };
  37
  38 void wg_allowedips_init(struct allowedips *table);
  39 void wg_allowedips_free(struct allowedips *table, struct mutex *mutex);
  40 int wg_allowedips_insert_v4(struct allowedips *table, const struct in_addr *ip,
  41                             u8 cidr, struct wg_peer *peer, struct mutex *lock);
  42 int wg_allowedips_insert_v6(struct allowedips *table, const struct in6_addr *ip,
  43                             u8 cidr, struct wg_peer *peer, struct mutex *lock);
  44 void wg_allowedips_remove_by_peer(struct allowedips *table,
  45                                   struct wg_peer *peer, struct mutex *lock);
  46 /* The ip input pointer should be __aligned(__alignof(u64))) */
  47 int wg_allowedips_read_node(struct allowedips_node *node, u8 ip[16], u8 *cidr);
  48
  49 /* These return a strong reference to a peer: */
  50 struct wg_peer *wg_allowedips_lookup_dst(struct allowedips *table,
  51                                          struct sk_buff *skb);
  52 struct wg_peer *wg_allowedips_lookup_src(struct allowedips *table,
  53                                          struct sk_buff *skb);
  54
  55 #ifdef DEBUG
  56 bool wg_allowedips_selftest(void);
  57 #endif
  58
  59 #endif /* _WG_ALLOWEDIPS_H */