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c539f017 FW |
1 | /* |
2 | * (C) 2013 Astaro GmbH & Co KG | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/skbuff.h> | |
11 | #include <net/netfilter/nf_conntrack.h> | |
857ed310 | 12 | #include <net/netfilter/nf_conntrack_ecache.h> |
c539f017 FW |
13 | #include <net/netfilter/nf_conntrack_labels.h> |
14 | #include <linux/netfilter/x_tables.h> | |
15 | ||
16 | MODULE_LICENSE("GPL"); | |
17 | MODULE_AUTHOR("Florian Westphal <fw@strlen.de>"); | |
18 | MODULE_DESCRIPTION("Xtables: add/match connection trackling labels"); | |
19 | MODULE_ALIAS("ipt_connlabel"); | |
20 | MODULE_ALIAS("ip6t_connlabel"); | |
21 | ||
22 | static bool | |
23 | connlabel_mt(const struct sk_buff *skb, struct xt_action_param *par) | |
24 | { | |
25 | const struct xt_connlabel_mtinfo *info = par->matchinfo; | |
26 | enum ip_conntrack_info ctinfo; | |
857ed310 | 27 | struct nf_conn_labels *labels; |
c539f017 FW |
28 | struct nf_conn *ct; |
29 | bool invert = info->options & XT_CONNLABEL_OP_INVERT; | |
30 | ||
31 | ct = nf_ct_get(skb, &ctinfo); | |
32 | if (ct == NULL || nf_ct_is_untracked(ct)) | |
33 | return invert; | |
34 | ||
857ed310 FW |
35 | labels = nf_ct_labels_find(ct); |
36 | if (!labels) | |
37 | return invert; | |
38 | ||
39 | if (test_bit(info->bit, labels->bits)) | |
40 | return !invert; | |
41 | ||
42 | if (info->options & XT_CONNLABEL_OP_SET) { | |
43 | if (!test_and_set_bit(info->bit, labels->bits)) | |
44 | nf_conntrack_event_cache(IPCT_LABEL, ct); | |
45 | ||
46 | return !invert; | |
47 | } | |
c539f017 | 48 | |
857ed310 | 49 | return invert; |
c539f017 FW |
50 | } |
51 | ||
52 | static int connlabel_mt_check(const struct xt_mtchk_param *par) | |
53 | { | |
54 | const int options = XT_CONNLABEL_OP_INVERT | | |
55 | XT_CONNLABEL_OP_SET; | |
56 | struct xt_connlabel_mtinfo *info = par->matchinfo; | |
57 | int ret; | |
c539f017 FW |
58 | |
59 | if (info->options & ~options) { | |
60 | pr_err("Unknown options in mask %x\n", info->options); | |
61 | return -EINVAL; | |
62 | } | |
63 | ||
ecb2421b | 64 | ret = nf_ct_netns_get(par->net, par->family); |
c539f017 FW |
65 | if (ret < 0) { |
66 | pr_info("cannot load conntrack support for proto=%u\n", | |
67 | par->family); | |
68 | return ret; | |
69 | } | |
70 | ||
adff6c65 | 71 | ret = nf_connlabels_get(par->net, info->bit); |
86ca02e7 | 72 | if (ret < 0) |
ecb2421b | 73 | nf_ct_netns_put(par->net, par->family); |
c539f017 FW |
74 | return ret; |
75 | } | |
76 | ||
77 | static void connlabel_mt_destroy(const struct xt_mtdtor_param *par) | |
78 | { | |
86ca02e7 | 79 | nf_connlabels_put(par->net); |
ecb2421b | 80 | nf_ct_netns_put(par->net, par->family); |
c539f017 FW |
81 | } |
82 | ||
83 | static struct xt_match connlabels_mt_reg __read_mostly = { | |
84 | .name = "connlabel", | |
85 | .family = NFPROTO_UNSPEC, | |
86 | .checkentry = connlabel_mt_check, | |
87 | .match = connlabel_mt, | |
88 | .matchsize = sizeof(struct xt_connlabel_mtinfo), | |
89 | .destroy = connlabel_mt_destroy, | |
90 | .me = THIS_MODULE, | |
91 | }; | |
92 | ||
93 | static int __init connlabel_mt_init(void) | |
94 | { | |
95 | return xt_register_match(&connlabels_mt_reg); | |
96 | } | |
97 | ||
98 | static void __exit connlabel_mt_exit(void) | |
99 | { | |
100 | xt_unregister_match(&connlabels_mt_reg); | |
101 | } | |
102 | ||
103 | module_init(connlabel_mt_init); | |
104 | module_exit(connlabel_mt_exit); |