Richard Weinberger | 6939c33 | 2012-02-10 23:10:52 +0100 | [diff] [blame] | 1 | /* |
| 2 | * This is a module which is used for logging packets. |
| 3 | */ |
| 4 | |
| 5 | /* (C) 1999-2001 Paul `Rusty' Russell |
| 6 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/spinlock.h> |
| 16 | #include <linux/skbuff.h> |
| 17 | #include <linux/if_arp.h> |
| 18 | #include <linux/ip.h> |
| 19 | #include <net/ipv6.h> |
| 20 | #include <net/icmp.h> |
| 21 | #include <net/udp.h> |
| 22 | #include <net/tcp.h> |
| 23 | #include <net/route.h> |
| 24 | |
| 25 | #include <linux/netfilter.h> |
| 26 | #include <linux/netfilter/x_tables.h> |
| 27 | #include <linux/netfilter/xt_LOG.h> |
| 28 | #include <linux/netfilter_ipv6/ip6_tables.h> |
| 29 | #include <net/netfilter/nf_log.h> |
Richard Weinberger | 6939c33 | 2012-02-10 23:10:52 +0100 | [diff] [blame] | 30 | |
Richard Weinberger | 6939c33 | 2012-02-10 23:10:52 +0100 | [diff] [blame] | 31 | static unsigned int |
| 32 | log_tg(struct sk_buff *skb, const struct xt_action_param *par) |
| 33 | { |
| 34 | const struct xt_log_info *loginfo = par->targinfo; |
| 35 | struct nf_loginfo li; |
Eric W. Biederman | 686c9b5 | 2015-09-18 14:32:59 -0500 | [diff] [blame] | 36 | struct net *net = par->net; |
Richard Weinberger | 6939c33 | 2012-02-10 23:10:52 +0100 | [diff] [blame] | 37 | |
| 38 | li.type = NF_LOG_TYPE_LOG; |
| 39 | li.u.log.level = loginfo->level; |
| 40 | li.u.log.logflags = loginfo->logflags; |
| 41 | |
Pablo Neira Ayuso | fab4085 | 2014-06-18 19:38:25 +0200 | [diff] [blame] | 42 | nf_log_packet(net, par->family, par->hooknum, skb, par->in, par->out, |
Pablo Neira Ayuso | ca1aa54 | 2014-06-28 18:42:41 +0200 | [diff] [blame] | 43 | &li, "%s", loginfo->prefix); |
Richard Weinberger | 6939c33 | 2012-02-10 23:10:52 +0100 | [diff] [blame] | 44 | return XT_CONTINUE; |
| 45 | } |
| 46 | |
| 47 | static int log_tg_check(const struct xt_tgchk_param *par) |
| 48 | { |
| 49 | const struct xt_log_info *loginfo = par->targinfo; |
| 50 | |
| 51 | if (par->family != NFPROTO_IPV4 && par->family != NFPROTO_IPV6) |
| 52 | return -EINVAL; |
| 53 | |
| 54 | if (loginfo->level >= 8) { |
| 55 | pr_debug("level %u >= 8\n", loginfo->level); |
| 56 | return -EINVAL; |
| 57 | } |
| 58 | |
| 59 | if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') { |
| 60 | pr_debug("prefix is not null-terminated\n"); |
| 61 | return -EINVAL; |
| 62 | } |
| 63 | |
Pablo Neira Ayuso | fab4085 | 2014-06-18 19:38:25 +0200 | [diff] [blame] | 64 | return nf_logger_find_get(par->family, NF_LOG_TYPE_LOG); |
| 65 | } |
| 66 | |
| 67 | static void log_tg_destroy(const struct xt_tgdtor_param *par) |
| 68 | { |
| 69 | nf_logger_put(par->family, NF_LOG_TYPE_LOG); |
Richard Weinberger | 6939c33 | 2012-02-10 23:10:52 +0100 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | static struct xt_target log_tg_regs[] __read_mostly = { |
| 73 | { |
| 74 | .name = "LOG", |
| 75 | .family = NFPROTO_IPV4, |
| 76 | .target = log_tg, |
| 77 | .targetsize = sizeof(struct xt_log_info), |
| 78 | .checkentry = log_tg_check, |
Pablo Neira Ayuso | fab4085 | 2014-06-18 19:38:25 +0200 | [diff] [blame] | 79 | .destroy = log_tg_destroy, |
Richard Weinberger | 6939c33 | 2012-02-10 23:10:52 +0100 | [diff] [blame] | 80 | .me = THIS_MODULE, |
| 81 | }, |
Pablo Neira Ayuso | a0f65a2 | 2012-03-10 12:15:15 +0100 | [diff] [blame] | 82 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) |
Richard Weinberger | 6939c33 | 2012-02-10 23:10:52 +0100 | [diff] [blame] | 83 | { |
| 84 | .name = "LOG", |
| 85 | .family = NFPROTO_IPV6, |
| 86 | .target = log_tg, |
| 87 | .targetsize = sizeof(struct xt_log_info), |
| 88 | .checkentry = log_tg_check, |
Pablo Neira Ayuso | fab4085 | 2014-06-18 19:38:25 +0200 | [diff] [blame] | 89 | .destroy = log_tg_destroy, |
Richard Weinberger | 6939c33 | 2012-02-10 23:10:52 +0100 | [diff] [blame] | 90 | .me = THIS_MODULE, |
| 91 | }, |
| 92 | #endif |
| 93 | }; |
| 94 | |
Richard Weinberger | 6939c33 | 2012-02-10 23:10:52 +0100 | [diff] [blame] | 95 | static int __init log_tg_init(void) |
| 96 | { |
Pablo Neira Ayuso | 83e96d4 | 2014-06-19 20:47:14 +0200 | [diff] [blame] | 97 | return xt_register_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs)); |
Richard Weinberger | 6939c33 | 2012-02-10 23:10:52 +0100 | [diff] [blame] | 98 | } |
| 99 | |
| 100 | static void __exit log_tg_exit(void) |
| 101 | { |
Richard Weinberger | 6939c33 | 2012-02-10 23:10:52 +0100 | [diff] [blame] | 102 | xt_unregister_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs)); |
| 103 | } |
| 104 | |
| 105 | module_init(log_tg_init); |
| 106 | module_exit(log_tg_exit); |
| 107 | |
| 108 | MODULE_LICENSE("GPL"); |
| 109 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); |
| 110 | MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>"); |
| 111 | MODULE_DESCRIPTION("Xtables: IPv4/IPv6 packet logging"); |
| 112 | MODULE_ALIAS("ipt_LOG"); |
| 113 | MODULE_ALIAS("ip6t_LOG"); |