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 */ 60