1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2c539f017SFlorian Westphal /*
3c539f017SFlorian Westphal * (C) 2013 Astaro GmbH & Co KG
4c539f017SFlorian Westphal */
5c539f017SFlorian Westphal
6c539f017SFlorian Westphal #include <linux/module.h>
7c539f017SFlorian Westphal #include <linux/skbuff.h>
8c539f017SFlorian Westphal #include <net/netfilter/nf_conntrack.h>
9857ed310SFlorian Westphal #include <net/netfilter/nf_conntrack_ecache.h>
10c539f017SFlorian Westphal #include <net/netfilter/nf_conntrack_labels.h>
11c539f017SFlorian Westphal #include <linux/netfilter/x_tables.h>
12c539f017SFlorian Westphal
13c539f017SFlorian Westphal MODULE_LICENSE("GPL");
14c539f017SFlorian Westphal MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
151de6f334SColin Ian King MODULE_DESCRIPTION("Xtables: add/match connection tracking labels");
16c539f017SFlorian Westphal MODULE_ALIAS("ipt_connlabel");
17c539f017SFlorian Westphal MODULE_ALIAS("ip6t_connlabel");
18c539f017SFlorian Westphal
19c539f017SFlorian Westphal static bool
connlabel_mt(const struct sk_buff * skb,struct xt_action_param * par)20c539f017SFlorian Westphal connlabel_mt(const struct sk_buff *skb, struct xt_action_param *par)
21c539f017SFlorian Westphal {
22c539f017SFlorian Westphal const struct xt_connlabel_mtinfo *info = par->matchinfo;
23c539f017SFlorian Westphal enum ip_conntrack_info ctinfo;
24857ed310SFlorian Westphal struct nf_conn_labels *labels;
25c539f017SFlorian Westphal struct nf_conn *ct;
26c539f017SFlorian Westphal bool invert = info->options & XT_CONNLABEL_OP_INVERT;
27c539f017SFlorian Westphal
28c539f017SFlorian Westphal ct = nf_ct_get(skb, &ctinfo);
29ab8bc7edSFlorian Westphal if (ct == NULL)
30c539f017SFlorian Westphal return invert;
31c539f017SFlorian Westphal
32857ed310SFlorian Westphal labels = nf_ct_labels_find(ct);
33857ed310SFlorian Westphal if (!labels)
34857ed310SFlorian Westphal return invert;
35c539f017SFlorian Westphal
36857ed310SFlorian Westphal if (test_bit(info->bit, labels->bits))
37857ed310SFlorian Westphal return !invert;
38857ed310SFlorian Westphal
39857ed310SFlorian Westphal if (info->options & XT_CONNLABEL_OP_SET) {
40857ed310SFlorian Westphal if (!test_and_set_bit(info->bit, labels->bits))
41857ed310SFlorian Westphal nf_conntrack_event_cache(IPCT_LABEL, ct);
42857ed310SFlorian Westphal
43857ed310SFlorian Westphal return !invert;
44857ed310SFlorian Westphal }
45857ed310SFlorian Westphal
46857ed310SFlorian Westphal return invert;
47c539f017SFlorian Westphal }
48c539f017SFlorian Westphal
connlabel_mt_check(const struct xt_mtchk_param * par)49c539f017SFlorian Westphal static int connlabel_mt_check(const struct xt_mtchk_param *par)
50c539f017SFlorian Westphal {
51c539f017SFlorian Westphal const int options = XT_CONNLABEL_OP_INVERT |
52c539f017SFlorian Westphal XT_CONNLABEL_OP_SET;
53c539f017SFlorian Westphal struct xt_connlabel_mtinfo *info = par->matchinfo;
54c539f017SFlorian Westphal int ret;
55c539f017SFlorian Westphal
56c539f017SFlorian Westphal if (info->options & ~options) {
57b2606644SFlorian Westphal pr_info_ratelimited("Unknown options in mask %x\n",
58b2606644SFlorian Westphal info->options);
59c539f017SFlorian Westphal return -EINVAL;
60c539f017SFlorian Westphal }
61c539f017SFlorian Westphal
62ecb2421bSFlorian Westphal ret = nf_ct_netns_get(par->net, par->family);
63c539f017SFlorian Westphal if (ret < 0) {
64b2606644SFlorian Westphal pr_info_ratelimited("cannot load conntrack support for proto=%u\n",
65c539f017SFlorian Westphal par->family);
66c539f017SFlorian Westphal return ret;
67c539f017SFlorian Westphal }
68c539f017SFlorian Westphal
69adff6c65SFlorian Westphal ret = nf_connlabels_get(par->net, info->bit);
7086ca02e7SJoe Stringer if (ret < 0)
71ecb2421bSFlorian Westphal nf_ct_netns_put(par->net, par->family);
72c539f017SFlorian Westphal return ret;
73c539f017SFlorian Westphal }
74c539f017SFlorian Westphal
connlabel_mt_destroy(const struct xt_mtdtor_param * par)75c539f017SFlorian Westphal static void connlabel_mt_destroy(const struct xt_mtdtor_param *par)
76c539f017SFlorian Westphal {
7786ca02e7SJoe Stringer nf_connlabels_put(par->net);
78ecb2421bSFlorian Westphal nf_ct_netns_put(par->net, par->family);
79c539f017SFlorian Westphal }
80c539f017SFlorian Westphal
81c539f017SFlorian Westphal static struct xt_match connlabels_mt_reg __read_mostly = {
82c539f017SFlorian Westphal .name = "connlabel",
83c539f017SFlorian Westphal .family = NFPROTO_UNSPEC,
84c539f017SFlorian Westphal .checkentry = connlabel_mt_check,
85c539f017SFlorian Westphal .match = connlabel_mt,
86c539f017SFlorian Westphal .matchsize = sizeof(struct xt_connlabel_mtinfo),
87c539f017SFlorian Westphal .destroy = connlabel_mt_destroy,
88c539f017SFlorian Westphal .me = THIS_MODULE,
89c539f017SFlorian Westphal };
90c539f017SFlorian Westphal
connlabel_mt_init(void)91c539f017SFlorian Westphal static int __init connlabel_mt_init(void)
92c539f017SFlorian Westphal {
93c539f017SFlorian Westphal return xt_register_match(&connlabels_mt_reg);
94c539f017SFlorian Westphal }
95c539f017SFlorian Westphal
connlabel_mt_exit(void)96c539f017SFlorian Westphal static void __exit connlabel_mt_exit(void)
97c539f017SFlorian Westphal {
98c539f017SFlorian Westphal xt_unregister_match(&connlabels_mt_reg);
99c539f017SFlorian Westphal }
100c539f017SFlorian Westphal
101c539f017SFlorian Westphal module_init(connlabel_mt_init);
102c539f017SFlorian Westphal module_exit(connlabel_mt_exit);
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