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