// SPDX-License-Identifier: GPL-2.0-only
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/*
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* (C) 2013 Astaro GmbH & Co KG
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_ecache.h>
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#include <net/netfilter/nf_conntrack_labels.h>
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#include <linux/netfilter/x_tables.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
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MODULE_DESCRIPTION("Xtables: add/match connection tracking labels");
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MODULE_ALIAS("ipt_connlabel");
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MODULE_ALIAS("ip6t_connlabel");
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static bool
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connlabel_mt(const struct sk_buff *skb, struct xt_action_param *par)
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{
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const struct xt_connlabel_mtinfo *info = par->matchinfo;
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enum ip_conntrack_info ctinfo;
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struct nf_conn_labels *labels;
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struct nf_conn *ct;
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bool invert = info->options & XT_CONNLABEL_OP_INVERT;
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ct = nf_ct_get(skb, &ctinfo);
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if (ct == NULL)
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return invert;
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labels = nf_ct_labels_find(ct);
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if (!labels)
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return invert;
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if (test_bit(info->bit, labels->bits))
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return !invert;
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if (info->options & XT_CONNLABEL_OP_SET) {
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if (!test_and_set_bit(info->bit, labels->bits))
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nf_conntrack_event_cache(IPCT_LABEL, ct);
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return !invert;
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}
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return invert;
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}
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static int connlabel_mt_check(const struct xt_mtchk_param *par)
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{
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const int options = XT_CONNLABEL_OP_INVERT |
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XT_CONNLABEL_OP_SET;
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struct xt_connlabel_mtinfo *info = par->matchinfo;
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int ret;
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if (info->options & ~options) {
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pr_info_ratelimited("Unknown options in mask %x\n",
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info->options);
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return -EINVAL;
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}
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ret = nf_ct_netns_get(par->net, par->family);
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if (ret < 0) {
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pr_info_ratelimited("cannot load conntrack support for proto=%u\n",
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par->family);
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return ret;
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}
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ret = nf_connlabels_get(par->net, info->bit);
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if (ret < 0)
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nf_ct_netns_put(par->net, par->family);
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return ret;
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}
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static void connlabel_mt_destroy(const struct xt_mtdtor_param *par)
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{
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nf_connlabels_put(par->net);
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nf_ct_netns_put(par->net, par->family);
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}
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static struct xt_match connlabels_mt_reg __read_mostly = {
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.name = "connlabel",
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.family = NFPROTO_UNSPEC,
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.checkentry = connlabel_mt_check,
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.match = connlabel_mt,
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.matchsize = sizeof(struct xt_connlabel_mtinfo),
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.destroy = connlabel_mt_destroy,
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.me = THIS_MODULE,
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};
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static int __init connlabel_mt_init(void)
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{
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return xt_register_match(&connlabels_mt_reg);
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}
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static void __exit connlabel_mt_exit(void)
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{
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xt_unregister_match(&connlabels_mt_reg);
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}
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module_init(connlabel_mt_init);
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module_exit(connlabel_mt_exit);
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