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| 2 | |
| 3 | * Copyright (c) 2006 Patrick McHardy <[email protected]>
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| 4 |
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| 5 |
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| 6 | #include <linux/module.h>
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| 7 | #include <linux/init.h>
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| 8 | #include <linux/skbuff.h>
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| 9 |
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| 10 | #include <linux/netfilter/x_tables.h>
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| 11 | #include <linux/netfilter/xt_NFLOG.h>
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| 12 | #include <net/netfilter/nf_log.h>
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| 13 |
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| 14 | MODULE_AUTHOR("Patrick McHardy <[email protected]>");
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| 15 | MODULE_DESCRIPTION("Xtables: packet logging to netlink using NFLOG");
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| 16 | MODULE_LICENSE("GPL");
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| 17 | MODULE_ALIAS("ipt_NFLOG");
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| 18 | MODULE_ALIAS("ip6t_NFLOG");
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| 19 |
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| 20 | static unsigned int
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| 21 | nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
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| 22 | {
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| 23 | const struct xt_nflog_info *info = par->targinfo;
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| 24 | struct net *net = xt_net(par);
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| 25 | struct nf_loginfo li;
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| 26 |
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| 27 | li.type = NF_LOG_TYPE_ULOG;
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| 28 | li.u.ulog.copy_len = info->len;
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| 29 | li.u.ulog.group = info->group;
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| 30 | li.u.ulog.qthreshold = info->threshold;
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| 31 | li.u.ulog.flags = 0;
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| 32 |
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| 33 | if (info->flags & XT_NFLOG_F_COPY_LEN)
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| 34 | li.u.ulog.flags |= NF_LOG_F_COPY_LEN;
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| 35 |
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| 36 | nf_log_packet(net, xt_family(par), xt_hooknum(par), skb, xt_in(par),
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| 37 | xt_out(par), &li, "%s", info->prefix);
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| 38 |
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| 39 | return XT_CONTINUE;
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| 40 | }
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| 41 |
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| 42 | static int nflog_tg_check(const struct xt_tgchk_param *par)
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| 43 | {
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| 44 | const struct xt_nflog_info *info = par->targinfo;
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| 45 | int ret;
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| 46 |
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| 47 | if (info->flags & ~XT_NFLOG_MASK)
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| 48 | return -EINVAL;
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| 49 | if (info->prefix[sizeof(info->prefix) - 1] != '\0')
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| 50 | return -EINVAL;
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| 51 |
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| 52 | ret = nf_logger_find_get(par->family, NF_LOG_TYPE_ULOG);
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| 53 | if (ret != 0 && !par->nft_compat) {
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| 54 | request_module("%s", "nfnetlink_log");
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| 55 |
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| 56 | ret = nf_logger_find_get(par->family, NF_LOG_TYPE_ULOG);
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| 57 | }
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| 58 |
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| 59 | return ret;
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| 60 | }
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| 61 |
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| 62 | static void nflog_tg_destroy(const struct xt_tgdtor_param *par)
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| 63 | {
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| 64 | nf_logger_put(par->family, NF_LOG_TYPE_ULOG);
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| 65 | }
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| 66 |
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| 67 | static struct xt_target nflog_tg_reg[] __read_mostly = {
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| 68 | {
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| 69 | .name = "NFLOG",
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| 70 | .revision = 0,
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| 71 | .family = NFPROTO_IPV4,
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| 72 | .checkentry = nflog_tg_check,
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| 73 | .destroy = nflog_tg_destroy,
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| 74 | .target = nflog_tg,
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| 75 | .targetsize = sizeof(struct xt_nflog_info),
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| 76 | .me = THIS_MODULE,
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| 77 | },
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| 78 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
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| 79 | {
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| 80 | .name = "NFLOG",
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| 81 | .revision = 0,
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| 82 | .family = NFPROTO_IPV6,
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| 83 | .checkentry = nflog_tg_check,
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| 84 | .destroy = nflog_tg_destroy,
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| 85 | .target = nflog_tg,
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| 86 | .targetsize = sizeof(struct xt_nflog_info),
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| 87 | .me = THIS_MODULE,
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| 88 | },
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| 89 | #endif
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| 90 | };
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| 91 |
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| 92 | static int __init nflog_tg_init(void)
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| 93 | {
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| 94 | return xt_register_targets(nflog_tg_reg, ARRAY_SIZE(nflog_tg_reg));
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| 95 | }
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| 96 |
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| 97 | static void __exit nflog_tg_exit(void)
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| 98 | {
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| 99 | xt_unregister_targets(nflog_tg_reg, ARRAY_SIZE(nflog_tg_reg));
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| 100 | }
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| 101 |
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| 102 | module_init(nflog_tg_init);
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| 103 | module_exit(nflog_tg_exit);
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| 104 | MODULE_SOFTDEP("pre: nfnetlink_log");
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