LXR linux/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
  13struct wg_peer;
  14
  15struct 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
  29struct 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
  35void wg_allowedips_init(struct allowedips *table);
  36void wg_allowedips_free(struct allowedips *table, struct mutex *mutex);
  37int wg_allowedips_insert_v4(struct allowedips *table, const struct in_addr *ip,
  38                            u8 cidr, struct wg_peer *peer, struct mutex *lock);
  39int wg_allowedips_insert_v6(struct allowedips *table, const struct in6_addr *ip,
  40                            u8 cidr, struct wg_peer *peer, struct mutex *lock);
  41void 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))) */
  44int wg_allowedips_read_node(struct allowedips_node *node, u8 ip[16], u8 *cidr);
  45
  46/* These return a strong reference to a peer: */
  47struct wg_peer *wg_allowedips_lookup_dst(struct allowedips *table,
  48                                         struct sk_buff *skb);
  49struct wg_peer *wg_allowedips_lookup_src(struct allowedips *table,
  50                                         struct sk_buff *skb);
  51
  52#ifdef DEBUG
  53bool wg_allowedips_selftest(void);
  54#endif
  55
  56int wg_allowedips_slab_init(void);
  57void wg_allowedips_slab_uninit(void);
  58
  59#endif /* _WG_ALLOWEDIPS_H */
  60