mirror of
git://git.code.sf.net/p/xtables-addons/xtables-addons
synced 2025-09-05 20:26:38 +02:00
145 lines
3.7 KiB
C
145 lines
3.7 KiB
C
/*
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* "LOGMARK" target extension to Xtables
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* useful for debugging
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*
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* Copyright © Jan Engelhardt, 2008-2010
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License; either
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* version 2 of the License, or any later version, as published by the
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* Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/version.h>
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#include <linux/netfilter/nf_conntrack_common.h>
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#include <linux/netfilter/x_tables.h>
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#include "compat_xtables.h"
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#include "xt_LOGMARK.h"
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static const char *const hook_names[] = {
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[NF_INET_PRE_ROUTING] = "PREROUTING",
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[NF_INET_LOCAL_IN] = "INPUT",
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[NF_INET_FORWARD] = "FORWARD",
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[NF_INET_LOCAL_OUT] = "OUTPUT",
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[NF_INET_POST_ROUTING] = "POSTROUTING",
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};
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static const char *const dir_names[] = {
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"ORIGINAL", "REPLY",
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};
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static void logmark_ct(const struct nf_conn *ct, enum ip_conntrack_info ctinfo)
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{
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bool prev = false;
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printk(" ct=0x%p ctmark=0x%x ctstate=", ct, ct->mark);
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ctinfo %= IP_CT_IS_REPLY;
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if (ctinfo == IP_CT_NEW)
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printk("NEW");
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else if (ctinfo == IP_CT_ESTABLISHED)
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printk("ESTABLISHED");
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else if (ctinfo == IP_CT_RELATED)
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printk("RELATED");
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if (test_bit(IPS_SRC_NAT_BIT, &ct->status))
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printk(",SNAT");
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if (test_bit(IPS_DST_NAT_BIT, &ct->status))
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printk(",DNAT");
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printk(" ctstatus=");
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if (ct->status & IPS_EXPECTED) {
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printk("EXPECTED");
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prev = true;
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}
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if (ct->status & IPS_SEEN_REPLY) {
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printk("%s""SEEN_REPLY", prev ? "," : "");
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prev = true;
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}
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if (ct->status & IPS_ASSURED) {
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printk("%s""ASSURED", prev ? "," : "");
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prev = true;
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}
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if (ct->status & IPS_CONFIRMED) {
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printk("%s""CONFIRMED", prev ? "," : "");
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prev = true;
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}
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printk(" lifetime=%lus", nf_ct_expires(ct) / HZ);
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}
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static unsigned int
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logmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct xt_logmark_tginfo *info = par->targinfo;
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const struct nf_conn *ct;
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enum ip_conntrack_info ctinfo;
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printk("<%u>%.*s""iif=%d hook=%s nfmark=0x%x "
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"secmark=0x%x classify=0x%x",
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info->level, (unsigned int)sizeof(info->prefix), info->prefix,
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skb_ifindex(skb), hook_names[par->state->hook],
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skb_nfmark(skb), skb_secmark(skb), skb->priority);
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ct = nf_ct_get(skb, &ctinfo);
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printk(" ctdir=%s", dir_names[ctinfo >= IP_CT_IS_REPLY]);
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if (ct == NULL)
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printk(" ct=NULL ctmark=NULL ctstate=INVALID ctstatus=NONE");
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else
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logmark_ct(ct, ctinfo);
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printk("\n");
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return XT_CONTINUE;
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}
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static int
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logmark_tg_check(const struct xt_tgchk_param *par)
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{
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const struct xt_logmark_tginfo *info = par->targinfo;
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if (info->level >= 8) {
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pr_debug("LOGMARK: level %u >= 8\n", info->level);
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return -EINVAL;
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}
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return 0;
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}
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static struct xt_target logmark_tg_reg[] __read_mostly = {
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{
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.name = "LOGMARK",
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.revision = 0,
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.family = NFPROTO_IPV4,
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.checkentry = logmark_tg_check,
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.target = logmark_tg,
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.targetsize = sizeof(struct xt_logmark_tginfo),
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.me = THIS_MODULE,
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},
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{
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.name = "LOGMARK",
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.revision = 0,
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.family = NFPROTO_IPV6,
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.checkentry = logmark_tg_check,
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.target = logmark_tg,
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.targetsize = sizeof(struct xt_logmark_tginfo),
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.me = THIS_MODULE,
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},
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};
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static int __init logmark_tg_init(void)
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{
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return xt_register_targets(logmark_tg_reg, ARRAY_SIZE(logmark_tg_reg));
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}
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static void __exit logmark_tg_exit(void)
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{
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xt_unregister_targets(logmark_tg_reg, ARRAY_SIZE(logmark_tg_reg));
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}
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module_init(logmark_tg_init);
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module_exit(logmark_tg_exit);
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MODULE_DESCRIPTION("Xtables: netfilter mark logging to syslog");
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MODULE_AUTHOR("Jan Engelhardt ");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("ipt_LOGMARK");
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MODULE_ALIAS("ip6t_LOGMARK");
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