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         u8 cidr, bit_at_a, bit_at_b, bitlen;
  19         u8 bits[16] __aligned(__alignof(u64));
  20
  21         /* Keep rarely used members at bottom to be beyond cache line. */
  22         unsigned long parent_bit_packed;
  23         union {
  24                 struct list_head peer_list;
  25                 struct rcu_head rcu;
  26         };
  27 };
  28
  29 struct allowedips {
  30         struct allowedips_node __rcu *root4;
  31         struct allowedips_node __rcu *root6;
  32         u64 seq;
  33 } __aligned(4); /* We pack the lower 2 bits of &root, but m68k only gives 16-bit alignment. */
  34
  35 void wg_allowedips_init(struct allowedips *table);
  36 void wg_allowedips_free(struct allowedips *table, struct mutex *mutex);
  37 int wg_allowedips_insert_v4(struct allowedips *table, const struct in_addr *ip,
  38                             u8 cidr, struct wg_peer *peer, struct mutex *lock);
  39 int wg_allowedips_insert_v6(struct allowedips *table, const struct in6_addr *ip,
  40                             u8 cidr, struct wg_peer *peer, struct mutex *lock);
  41 void wg_allowedips_remove_by_peer(struct allowedips *table,
  42                                   struct wg_peer *peer, struct mutex *lock);
  43 /* The ip input pointer should be __aligned(__alignof(u64))) */
  44 int wg_allowedips_read_node(struct allowedips_node *node, u8 ip[16], u8 *cidr);
  45
  46 /* These return a strong reference to a peer: */
  47 struct wg_peer *wg_allowedips_lookup_dst(struct allowedips *table,
  48                                          struct sk_buff *skb);
  49 struct wg_peer *wg_allowedips_lookup_src(struct allowedips *table,
  50                                          struct sk_buff *skb);
  51
  52 #ifdef DEBUG
  53 bool wg_allowedips_selftest(void);
  54 #endif
  55
  56 int wg_allowedips_slab_init(void);
  57 void wg_allowedips_slab_uninit(void);
  58
  59 #endif /* _WG_ALLOWEDIPS_H */