mirror of
git://git.code.sf.net/p/xtables-addons/xtables-addons
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137 lines
3.8 KiB
C
137 lines
3.8 KiB
C
/*
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* xt_LOGMARK - netfilter mark logging
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* useful for debugging
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*
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* Copyright © CC Computer Consultants, 2007 - 2008
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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
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* version 2 or 3 as published by the 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/netfilter/nf_conntrack_common.h>
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#include <linux/netfilter/x_tables.h>
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//#include <net/netfilter/nf_conntrack.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 unsigned int
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logmark_tg(struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, unsigned int hooknum,
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const struct xt_target *target, const void *targinfo)
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{
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const struct xt_logmark_tginfo *info = targinfo;
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const struct nf_conn *ct;
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enum ip_conntrack_info ctinfo;
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bool prev = false;
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printk("<%u>%.*s""hook=%s nfmark=0x%x secmark=0x%x classify=0x%x",
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info->level, (unsigned int)sizeof(info->prefix), info->prefix,
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hook_names[hooknum],
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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 if (ct == &nf_conntrack_untracked) {
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printk(" ct=UNTRACKED ctmark=NULL ctstate=UNTRACKED ctstatus=NONE");
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} else {
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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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if (ct->status & IPS_ASSURED)
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printk("%s""ASSURED", prev++ ? "," : "");
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if (ct->status & IPS_CONFIRMED)
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printk("%s""CONFIRMED", prev++ ? "," : "");
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}
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printk("\n");
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return XT_CONTINUE;
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}
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static bool
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logmark_tg_check(const char *tablename, const void *e,
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const struct xt_target *target, void *targinfo,
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unsigned int hook_mask)
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{
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const struct xt_logmark_tginfo *info = 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 false;
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}
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return true;
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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 = AF_INET,
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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 = AF_INET6,
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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 <jengelh@computergmbh.de>");
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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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