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	/* 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
32struct allowedips {
33	struct allowedips_node __rcu *root4;
34	struct allowedips_node __rcu *root6;
35	u64 seq;
36};
37
38void wg_allowedips_init(struct allowedips *table);
39void wg_allowedips_free(struct allowedips *table, struct mutex *mutex);
40int wg_allowedips_insert_v4(struct allowedips *table, const struct in_addr *ip,
41			    u8 cidr, struct wg_peer *peer, struct mutex *lock);
42int wg_allowedips_insert_v6(struct allowedips *table, const struct in6_addr *ip,
43			    u8 cidr, struct wg_peer *peer, struct mutex *lock);
44void 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))) */
47int wg_allowedips_read_node(struct allowedips_node *node, u8 ip[16], u8 *cidr);
48
49/* These return a strong reference to a peer: */
50struct wg_peer *wg_allowedips_lookup_dst(struct allowedips *table,
51					 struct sk_buff *skb);
52struct wg_peer *wg_allowedips_lookup_src(struct allowedips *table,
53					 struct sk_buff *skb);
54
55#ifdef DEBUG
56bool wg_allowedips_selftest(void);
57#endif
58
59#endif /* _WG_ALLOWEDIPS_H */