Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Creates audit record for dropped/accepted packets
4 *
5 * (C) 2010-2011 Thomas Graf <tgraf@redhat.com>
6 * (C) 2010-2011 Red Hat, Inc.
7*/
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/audit.h>
12#include <linux/module.h>
13#include <linux/skbuff.h>
14#include <linux/tcp.h>
15#include <linux/udp.h>
16#include <linux/if_arp.h>
17#include <linux/netfilter/x_tables.h>
18#include <linux/netfilter/xt_AUDIT.h>
19#include <linux/netfilter_bridge/ebtables.h>
20#include <net/ipv6.h>
21#include <net/ip.h>
22
23MODULE_LICENSE("GPL");
24MODULE_AUTHOR("Thomas Graf <tgraf@redhat.com>");
25MODULE_DESCRIPTION("Xtables: creates audit records for dropped/accepted packets");
26MODULE_ALIAS("ipt_AUDIT");
27MODULE_ALIAS("ip6t_AUDIT");
28MODULE_ALIAS("ebt_AUDIT");
29MODULE_ALIAS("arpt_AUDIT");
30
31static unsigned int
32audit_tg(struct sk_buff *skb, const struct xt_action_param *par)
33{
34 struct audit_buffer *ab;
35
36 if (audit_enabled == AUDIT_OFF)
37 goto errout;
38 ab = audit_log_start(NULL, GFP_ATOMIC, AUDIT_NETFILTER_PKT);
39 if (ab == NULL)
40 goto errout;
41
42 audit_log_format(ab, "mark=%#x", skb->mark);
43
44 audit_log_nf_skb(ab, skb, xt_family(par));
45
46 audit_log_end(ab);
47
48errout:
49 return XT_CONTINUE;
50}
51
52static unsigned int
53audit_tg_ebt(struct sk_buff *skb, const struct xt_action_param *par)
54{
55 audit_tg(skb, par);
56 return EBT_CONTINUE;
57}
58
59static int audit_tg_check(const struct xt_tgchk_param *par)
60{
61 const struct xt_audit_info *info = par->targinfo;
62
63 if (info->type > XT_AUDIT_TYPE_MAX) {
64 pr_info_ratelimited("Audit type out of range (valid range: 0..%u)\n",
65 XT_AUDIT_TYPE_MAX);
66 return -ERANGE;
67 }
68
69 return 0;
70}
71
72static struct xt_target audit_tg_reg[] __read_mostly = {
73 {
74 .name = "AUDIT",
75 .family = NFPROTO_UNSPEC,
76 .target = audit_tg,
77 .targetsize = sizeof(struct xt_audit_info),
78 .checkentry = audit_tg_check,
79 .me = THIS_MODULE,
80 },
81 {
82 .name = "AUDIT",
83 .family = NFPROTO_BRIDGE,
84 .target = audit_tg_ebt,
85 .targetsize = sizeof(struct xt_audit_info),
86 .checkentry = audit_tg_check,
87 .me = THIS_MODULE,
88 },
89};
90
91static int __init audit_tg_init(void)
92{
93 return xt_register_targets(audit_tg_reg, ARRAY_SIZE(audit_tg_reg));
94}
95
96static void __exit audit_tg_exit(void)
97{
98 xt_unregister_targets(audit_tg_reg, ARRAY_SIZE(audit_tg_reg));
99}
100
101module_init(audit_tg_init);
102module_exit(audit_tg_exit);