1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * ebt_mark_m |
4 | * |
5 | * Authors: |
6 | * Bart De Schuymer <bdschuym@pandora.be> |
7 | * |
8 | * July, 2002 |
9 | * |
10 | */ |
11 | #include <linux/module.h> |
12 | #include <linux/netfilter/x_tables.h> |
13 | #include <linux/netfilter_bridge/ebtables.h> |
14 | #include <linux/netfilter_bridge/ebt_mark_m.h> |
15 | |
16 | static bool |
17 | ebt_mark_mt(const struct sk_buff *skb, struct xt_action_param *par) |
18 | { |
19 | const struct ebt_mark_m_info *info = par->matchinfo; |
20 | |
21 | if (info->bitmask & EBT_MARK_OR) |
22 | return !!(skb->mark & info->mask) ^ info->invert; |
23 | return ((skb->mark & info->mask) == info->mark) ^ info->invert; |
24 | } |
25 | |
26 | static int ebt_mark_mt_check(const struct xt_mtchk_param *par) |
27 | { |
28 | const struct ebt_mark_m_info *info = par->matchinfo; |
29 | |
30 | if (info->bitmask & ~EBT_MARK_MASK) |
31 | return -EINVAL; |
32 | if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND)) |
33 | return -EINVAL; |
34 | if (!info->bitmask) |
35 | return -EINVAL; |
36 | return 0; |
37 | } |
38 | |
39 | |
40 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
41 | struct compat_ebt_mark_m_info { |
42 | compat_ulong_t mark, mask; |
43 | uint8_t invert, bitmask; |
44 | }; |
45 | |
46 | static void mark_mt_compat_from_user(void *dst, const void *src) |
47 | { |
48 | const struct compat_ebt_mark_m_info *user = src; |
49 | struct ebt_mark_m_info *kern = dst; |
50 | |
51 | kern->mark = user->mark; |
52 | kern->mask = user->mask; |
53 | kern->invert = user->invert; |
54 | kern->bitmask = user->bitmask; |
55 | } |
56 | |
57 | static int mark_mt_compat_to_user(void __user *dst, const void *src) |
58 | { |
59 | struct compat_ebt_mark_m_info __user *user = dst; |
60 | const struct ebt_mark_m_info *kern = src; |
61 | |
62 | if (put_user(kern->mark, &user->mark) || |
63 | put_user(kern->mask, &user->mask) || |
64 | put_user(kern->invert, &user->invert) || |
65 | put_user(kern->bitmask, &user->bitmask)) |
66 | return -EFAULT; |
67 | return 0; |
68 | } |
69 | #endif |
70 | |
71 | static struct xt_match ebt_mark_mt_reg __read_mostly = { |
72 | .name = "mark_m" , |
73 | .revision = 0, |
74 | .family = NFPROTO_BRIDGE, |
75 | .match = ebt_mark_mt, |
76 | .checkentry = ebt_mark_mt_check, |
77 | .matchsize = sizeof(struct ebt_mark_m_info), |
78 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
79 | .compatsize = sizeof(struct compat_ebt_mark_m_info), |
80 | .compat_from_user = mark_mt_compat_from_user, |
81 | .compat_to_user = mark_mt_compat_to_user, |
82 | #endif |
83 | .me = THIS_MODULE, |
84 | }; |
85 | |
86 | static int __init ebt_mark_m_init(void) |
87 | { |
88 | return xt_register_match(target: &ebt_mark_mt_reg); |
89 | } |
90 | |
91 | static void __exit ebt_mark_m_fini(void) |
92 | { |
93 | xt_unregister_match(target: &ebt_mark_mt_reg); |
94 | } |
95 | |
96 | module_init(ebt_mark_m_init); |
97 | module_exit(ebt_mark_m_fini); |
98 | MODULE_DESCRIPTION("Ebtables: Packet mark match" ); |
99 | MODULE_LICENSE("GPL" ); |
100 | |