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git://git.code.sf.net/p/xtables-addons/xtables-addons
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6d2998588d
xt_LOGMARK dumps the nfmark (packet mark), ctmark (connection mark) and/or secmark to syslog. Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
100 lines
2.6 KiB
C
100 lines
2.6 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/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 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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printk("<%u>%.*s", info->level, sizeof(info->prefix), info->prefix);
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if (info->flags & XT_LOGMARK_NFMARK)
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printk(" nfmark=0x%x", skb->mark);
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if (info->flags & XT_LOGMARK_CTMARK) {
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const struct nf_conn *ct;
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enum ip_conntrack_info ctinfo;
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ct = nf_ct_get(skb, &ctinfo);
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if (ct == NULL)
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printk(" ctmark=X");
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else
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printk(" ctmark=0x%x", ct->mark);
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}
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if (info->flags & XT_LOGMARK_SECMARK)
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printk(" secmark=0x%x", skb->secmark);
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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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