| 1 | |
| 2 | |
| 3 | * This is a module which is used for logging packets.
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| 4 |
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| 5 |
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| 6 | |
| 7 | * (C) 2002-2004 Netfilter Core Team <[email protected]>
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| 8 |
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| 9 |
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| 10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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| 11 | #include <linux/module.h>
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| 12 | #include <linux/spinlock.h>
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| 13 | #include <linux/skbuff.h>
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| 14 | #include <linux/if_arp.h>
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| 15 | #include <linux/ip.h>
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| 16 | #include <net/ipv6.h>
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| 17 | #include <net/icmp.h>
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| 18 | #include <net/udp.h>
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| 19 | #include <net/tcp.h>
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| 20 | #include <net/route.h>
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| 21 |
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| 22 | #include <linux/netfilter.h>
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| 23 | #include <linux/netfilter/x_tables.h>
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| 24 | #include <linux/netfilter/xt_LOG.h>
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| 25 | #include <linux/netfilter_ipv6/ip6_tables.h>
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| 26 | #include <net/netfilter/nf_log.h>
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| 27 |
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| 28 | static unsigned int
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| 29 | log_tg(struct sk_buff *skb, const struct xt_action_param *par)
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| 30 | {
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| 31 | const struct xt_log_info *loginfo = par->targinfo;
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| 32 | struct net *net = xt_net(par);
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| 33 | struct nf_loginfo li;
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| 34 |
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| 35 | li.type = NF_LOG_TYPE_LOG;
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| 36 | li.u.log.level = loginfo->level;
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| 37 | li.u.log.logflags = loginfo->logflags;
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| 38 |
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| 39 | nf_log_packet(net, xt_family(par), xt_hooknum(par), skb, xt_in(par),
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| 40 | xt_out(par), &li, "%s", loginfo->prefix);
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| 41 | return XT_CONTINUE;
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| 42 | }
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| 43 |
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| 44 | static int log_tg_check(const struct xt_tgchk_param *par)
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| 45 | {
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| 46 | const struct xt_log_info *loginfo = par->targinfo;
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| 47 | int ret;
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| 48 |
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| 49 | if (par->family != NFPROTO_IPV4 && par->family != NFPROTO_IPV6)
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| 50 | return -EINVAL;
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| 51 |
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| 52 | if (loginfo->level >= 8) {
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| 53 | pr_info_ratelimited("level %u >= 8\n", loginfo->level);
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| 54 | return -EINVAL;
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| 55 | }
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| 56 |
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| 57 | if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
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| 58 | pr_info_ratelimited("prefix is not null-terminated\n");
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| 59 | return -EINVAL;
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| 60 | }
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| 61 |
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| 62 | ret = nf_logger_find_get(par->family, NF_LOG_TYPE_LOG);
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| 63 | if (ret != 0 && !par->nft_compat) {
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| 64 | request_module("%s", "nf_log_syslog");
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| 65 |
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| 66 | ret = nf_logger_find_get(par->family, NF_LOG_TYPE_LOG);
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| 67 | }
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| 68 |
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| 69 | return ret;
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| 70 | }
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| 71 |
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| 72 | static void log_tg_destroy(const struct xt_tgdtor_param *par)
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| 73 | {
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| 74 | nf_logger_put(par->family, NF_LOG_TYPE_LOG);
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| 75 | }
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| 76 |
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| 77 | static struct xt_target log_tg_regs[] __read_mostly = {
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| 78 | {
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| 79 | .name = "LOG",
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| 80 | .family = NFPROTO_IPV4,
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| 81 | .target = log_tg,
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| 82 | .targetsize = sizeof(struct xt_log_info),
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| 83 | .checkentry = log_tg_check,
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| 84 | .destroy = log_tg_destroy,
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| 85 | .me = THIS_MODULE,
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| 86 | },
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| 87 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
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| 88 | {
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| 89 | .name = "LOG",
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| 90 | .family = NFPROTO_IPV6,
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| 91 | .target = log_tg,
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| 92 | .targetsize = sizeof(struct xt_log_info),
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| 93 | .checkentry = log_tg_check,
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| 94 | .destroy = log_tg_destroy,
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| 95 | .me = THIS_MODULE,
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| 96 | },
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| 97 | #endif
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| 98 | };
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| 99 |
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| 100 | static int __init log_tg_init(void)
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| 101 | {
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| 102 | return xt_register_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
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| 103 | }
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| 104 |
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| 105 | static void __exit log_tg_exit(void)
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| 106 | {
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| 107 | xt_unregister_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
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| 108 | }
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| 109 |
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| 110 | module_init(log_tg_init);
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| 111 | module_exit(log_tg_exit);
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| 112 |
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| 113 | MODULE_LICENSE("GPL");
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| 114 | MODULE_AUTHOR("Netfilter Core Team <[email protected]>");
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| 115 | MODULE_AUTHOR("Jan Rekorajski <[email protected]>");
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| 116 | MODULE_DESCRIPTION("Xtables: IPv4/IPv6 packet logging");
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| 117 | MODULE_ALIAS("ipt_LOG");
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| 118 | MODULE_ALIAS("ip6t_LOG");
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| 119 | MODULE_SOFTDEP("pre: nf_log_syslog");
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