[net-next-2.6.git] / net / ipv4 / netfilter / ipt_LOG.c

/*
 * This is a module which is used for logging packets.
 */

/* (C) 1999-2001 Paul `Rusty' Russell
 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <net/icmp.h>
#include <net/udp.h>
#include <net/tcp.h>
#include <net/route.h>

#include <linux/netfilter.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_LOG.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("iptables syslog logging module");

#if 0
#define DEBUGP printk
#else
#define DEBUGP(format, args...)
#endif

/* Use lock to serialize, so printks don't overlap */
static DEFINE_SPINLOCK(log_lock);

/* One level of recursion won't kill us */
static void dump_packet(const struct nf_loginfo *info,
			const struct sk_buff *skb,
			unsigned int iphoff)
{
	struct iphdr _iph, *ih;
	unsigned int logflags;

	if (info->type == NF_LOG_TYPE_LOG)
		logflags = info->u.log.logflags;
	else
		logflags = NF_LOG_MASK;

	ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
	if (ih == NULL) {
		printk("TRUNCATED");
		return;
	}

	/* Important fields:
	 * TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */
	/* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */
	printk("SRC=%u.%u.%u.%u DST=%u.%u.%u.%u ",
	       NIPQUAD(ih->saddr), NIPQUAD(ih->daddr));

	/* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */
	printk("LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
	       ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK,
	       ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id));

	/* Max length: 6 "CE DF MF " */
	if (ntohs(ih->frag_off) & IP_CE)
		printk("CE ");
	if (ntohs(ih->frag_off) & IP_DF)
		printk("DF ");
	if (ntohs(ih->frag_off) & IP_MF)
		printk("MF ");

	/* Max length: 11 "FRAG:65535 " */
	if (ntohs(ih->frag_off) & IP_OFFSET)
		printk("FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);

	if ((logflags & IPT_LOG_IPOPT)
	    && ih->ihl * 4 > sizeof(struct iphdr)) {
		unsigned char _opt[4 * 15 - sizeof(struct iphdr)], *op;
		unsigned int i, optsize;

		optsize = ih->ihl * 4 - sizeof(struct iphdr);
		op = skb_header_pointer(skb, iphoff+sizeof(_iph),
					optsize, _opt);
		if (op == NULL) {
			printk("TRUNCATED");
			return;
		}

		/* Max length: 127 "OPT (" 15*4*2chars ") " */
		printk("OPT (");
		for (i = 0; i < optsize; i++)
			printk("%02X", op[i]);
		printk(") ");
	}

	switch (ih->protocol) {
	case IPPROTO_TCP: {
		struct tcphdr _tcph, *th;

		/* Max length: 10 "PROTO=TCP " */
		printk("PROTO=TCP ");

		if (ntohs(ih->frag_off) & IP_OFFSET)
			break;

		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
		th = skb_header_pointer(skb, iphoff + ih->ihl * 4,
					sizeof(_tcph), &_tcph);
		if (th == NULL) {
			printk("INCOMPLETE [%u bytes] ",
			       skb->len - iphoff - ih->ihl*4);
			break;
		}

		/* Max length: 20 "SPT=65535 DPT=65535 " */
		printk("SPT=%u DPT=%u ",
		       ntohs(th->source), ntohs(th->dest));
		/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
		if (logflags & IPT_LOG_TCPSEQ)
			printk("SEQ=%u ACK=%u ",
			       ntohl(th->seq), ntohl(th->ack_seq));
		/* Max length: 13 "WINDOW=65535 " */
		printk("WINDOW=%u ", ntohs(th->window));
		/* Max length: 9 "RES=0x3F " */
		printk("RES=0x%02x ", (u8)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22));
		/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
		if (th->cwr)
			printk("CWR ");
		if (th->ece)
			printk("ECE ");
		if (th->urg)
			printk("URG ");
		if (th->ack)
			printk("ACK ");
		if (th->psh)
			printk("PSH ");
		if (th->rst)
			printk("RST ");
		if (th->syn)
			printk("SYN ");
		if (th->fin)
			printk("FIN ");
		/* Max length: 11 "URGP=65535 " */
		printk("URGP=%u ", ntohs(th->urg_ptr));

		if ((logflags & IPT_LOG_TCPOPT)
		    && th->doff * 4 > sizeof(struct tcphdr)) {
			unsigned char _opt[4 * 15 - sizeof(struct tcphdr)];
			unsigned char *op;
			unsigned int i, optsize;

			optsize = th->doff * 4 - sizeof(struct tcphdr);
			op = skb_header_pointer(skb,
						iphoff+ih->ihl*4+sizeof(_tcph),
						optsize, _opt);
			if (op == NULL) {
				printk("TRUNCATED");
				return;
			}

			/* Max length: 127 "OPT (" 15*4*2chars ") " */
			printk("OPT (");
			for (i = 0; i < optsize; i++)
				printk("%02X", op[i]);
			printk(") ");
		}
		break;
	}
	case IPPROTO_UDP:
	case IPPROTO_UDPLITE: {
		struct udphdr _udph, *uh;

		if (ih->protocol == IPPROTO_UDP)
			/* Max length: 10 "PROTO=UDP "     */
			printk("PROTO=UDP " );
		else	/* Max length: 14 "PROTO=UDPLITE " */
			printk("PROTO=UDPLITE ");

		if (ntohs(ih->frag_off) & IP_OFFSET)
			break;

		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
		uh = skb_header_pointer(skb, iphoff+ih->ihl*4,
					sizeof(_udph), &_udph);
		if (uh == NULL) {
			printk("INCOMPLETE [%u bytes] ",
			       skb->len - iphoff - ih->ihl*4);
			break;
		}

		/* Max length: 20 "SPT=65535 DPT=65535 " */
		printk("SPT=%u DPT=%u LEN=%u ",
		       ntohs(uh->source), ntohs(uh->dest),
		       ntohs(uh->len));
		break;
	}
	case IPPROTO_ICMP: {
		struct icmphdr _icmph, *ich;
		static const size_t required_len[NR_ICMP_TYPES+1]
			= { [ICMP_ECHOREPLY] = 4,
			    [ICMP_DEST_UNREACH]
			    = 8 + sizeof(struct iphdr),
			    [ICMP_SOURCE_QUENCH]
			    = 8 + sizeof(struct iphdr),
			    [ICMP_REDIRECT]
			    = 8 + sizeof(struct iphdr),
			    [ICMP_ECHO] = 4,
			    [ICMP_TIME_EXCEEDED]
			    = 8 + sizeof(struct iphdr),
			    [ICMP_PARAMETERPROB]
			    = 8 + sizeof(struct iphdr),
			    [ICMP_TIMESTAMP] = 20,
			    [ICMP_TIMESTAMPREPLY] = 20,
			    [ICMP_ADDRESS] = 12,
			    [ICMP_ADDRESSREPLY] = 12 };

		/* Max length: 11 "PROTO=ICMP " */
		printk("PROTO=ICMP ");

		if (ntohs(ih->frag_off) & IP_OFFSET)
			break;

		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
		ich = skb_header_pointer(skb, iphoff + ih->ihl * 4,
					 sizeof(_icmph), &_icmph);
		if (ich == NULL) {
			printk("INCOMPLETE [%u bytes] ",
			       skb->len - iphoff - ih->ihl*4);
			break;
		}

		/* Max length: 18 "TYPE=255 CODE=255 " */
		printk("TYPE=%u CODE=%u ", ich->type, ich->code);

		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
		if (ich->type <= NR_ICMP_TYPES
		    && required_len[ich->type]
		    && skb->len-iphoff-ih->ihl*4 < required_len[ich->type]) {
			printk("INCOMPLETE [%u bytes] ",
			       skb->len - iphoff - ih->ihl*4);
			break;
		}

		switch (ich->type) {
		case ICMP_ECHOREPLY:
		case ICMP_ECHO:
			/* Max length: 19 "ID=65535 SEQ=65535 " */
			printk("ID=%u SEQ=%u ",
			       ntohs(ich->un.echo.id),
			       ntohs(ich->un.echo.sequence));
			break;

		case ICMP_PARAMETERPROB:
			/* Max length: 14 "PARAMETER=255 " */
			printk("PARAMETER=%u ",
			       ntohl(ich->un.gateway) >> 24);
			break;
		case ICMP_REDIRECT:
			/* Max length: 24 "GATEWAY=255.255.255.255 " */
			printk("GATEWAY=%u.%u.%u.%u ",
			       NIPQUAD(ich->un.gateway));
			/* Fall through */
		case ICMP_DEST_UNREACH:
		case ICMP_SOURCE_QUENCH:
		case ICMP_TIME_EXCEEDED:
			/* Max length: 3+maxlen */
			if (!iphoff) { /* Only recurse once. */
				printk("[");
				dump_packet(info, skb,
					    iphoff + ih->ihl*4+sizeof(_icmph));
				printk("] ");
			}

			/* Max length: 10 "MTU=65535 " */
			if (ich->type == ICMP_DEST_UNREACH
			    && ich->code == ICMP_FRAG_NEEDED)
				printk("MTU=%u ", ntohs(ich->un.frag.mtu));
		}
		break;
	}
	/* Max Length */
	case IPPROTO_AH: {
		struct ip_auth_hdr _ahdr, *ah;

		if (ntohs(ih->frag_off) & IP_OFFSET)
			break;
		
		/* Max length: 9 "PROTO=AH " */
		printk("PROTO=AH ");

		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
		ah = skb_header_pointer(skb, iphoff+ih->ihl*4,
					sizeof(_ahdr), &_ahdr);
		if (ah == NULL) {
			printk("INCOMPLETE [%u bytes] ",
			       skb->len - iphoff - ih->ihl*4);
			break;
		}

		/* Length: 15 "SPI=0xF1234567 " */
		printk("SPI=0x%x ", ntohl(ah->spi));
		break;
	}
	case IPPROTO_ESP: {
		struct ip_esp_hdr _esph, *eh;

		/* Max length: 10 "PROTO=ESP " */
		printk("PROTO=ESP ");

		if (ntohs(ih->frag_off) & IP_OFFSET)
			break;

		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
		eh = skb_header_pointer(skb, iphoff+ih->ihl*4,
					sizeof(_esph), &_esph);
		if (eh == NULL) {
			printk("INCOMPLETE [%u bytes] ",
			       skb->len - iphoff - ih->ihl*4);
			break;
		}

		/* Length: 15 "SPI=0xF1234567 " */
		printk("SPI=0x%x ", ntohl(eh->spi));
		break;
	}
	/* Max length: 10 "PROTO 255 " */
	default:
		printk("PROTO=%u ", ih->protocol);
	}

	/* Max length: 15 "UID=4294967295 " */
 	if ((logflags & IPT_LOG_UID) && !iphoff && skb->sk) {
		read_lock_bh(&skb->sk->sk_callback_lock);
		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
 			printk("UID=%u ", skb->sk->sk_socket->file->f_uid);
		read_unlock_bh(&skb->sk->sk_callback_lock);
	}

	/* Proto    Max log string length */
	/* IP:      40+46+6+11+127 = 230 */
	/* TCP:     10+max(25,20+30+13+9+32+11+127) = 252 */
	/* UDP:     10+max(25,20) = 35 */
	/* UDPLITE: 14+max(25,20) = 39 */
	/* ICMP:    11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */
	/* ESP:     10+max(25)+15 = 50 */
	/* AH:      9+max(25)+15 = 49 */
	/* unknown: 10 */

	/* (ICMP allows recursion one level deep) */
	/* maxlen =  IP + ICMP +  IP + max(TCP,UDP,ICMP,unknown) */
	/* maxlen = 230+   91  + 230 + 252 = 803 */
}

static struct nf_loginfo default_loginfo = {
	.type	= NF_LOG_TYPE_LOG,
	.u = {
		.log = {
			.level    = 0,
			.logflags = NF_LOG_MASK,
		},
	},
};

static void
ipt_log_packet(unsigned int pf,
	       unsigned int hooknum,
	       const struct sk_buff *skb,
	       const struct net_device *in,
	       const struct net_device *out,
	       const struct nf_loginfo *loginfo,
	       const char *prefix)
{
	if (!loginfo)
		loginfo = &default_loginfo;

	spin_lock_bh(&log_lock);
	printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
	       prefix,
	       in ? in->name : "",
	       out ? out->name : "");
#ifdef CONFIG_BRIDGE_NETFILTER
	if (skb->nf_bridge) {
		struct net_device *physindev = skb->nf_bridge->physindev;
		struct net_device *physoutdev = skb->nf_bridge->physoutdev;

		if (physindev && in != physindev)
			printk("PHYSIN=%s ", physindev->name);
		if (physoutdev && out != physoutdev)
			printk("PHYSOUT=%s ", physoutdev->name);
	}
#endif

	if (in && !out) {
		/* MAC logging for input chain only. */
		printk("MAC=");
		if (skb->dev && skb->dev->hard_header_len
		    && skb->mac.raw != (void*)skb->nh.iph) {
			int i;
			unsigned char *p = skb->mac.raw;
			for (i = 0; i < skb->dev->hard_header_len; i++,p++)
				printk("%02x%c", *p,
				       i==skb->dev->hard_header_len - 1
				       ? ' ':':');
		} else
			printk(" ");
	}

	dump_packet(loginfo, skb, 0);
	printk("\n");
	spin_unlock_bh(&log_lock);
}

static unsigned int
ipt_log_target(struct sk_buff **pskb,
	       const struct net_device *in,
	       const struct net_device *out,
	       unsigned int hooknum,
	       const struct xt_target *target,
	       const void *targinfo)
{
	const struct ipt_log_info *loginfo = targinfo;
	struct nf_loginfo li;

	li.type = NF_LOG_TYPE_LOG;
	li.u.log.level = loginfo->level;
	li.u.log.logflags = loginfo->logflags;

	ipt_log_packet(PF_INET, hooknum, *pskb, in, out, &li,
	               loginfo->prefix);
	return IPT_CONTINUE;
}

static int ipt_log_checkentry(const char *tablename,
			      const void *e,
			      const struct xt_target *target,
			      void *targinfo,
			      unsigned int hook_mask)
{
	const struct ipt_log_info *loginfo = targinfo;

	if (loginfo->level >= 8) {
		DEBUGP("LOG: level %u >= 8\n", loginfo->level);
		return 0;
	}
	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
		DEBUGP("LOG: prefix term %i\n",
		       loginfo->prefix[sizeof(loginfo->prefix)-1]);
		return 0;
	}
	return 1;
}

static struct ipt_target ipt_log_reg = {
	.name		= "LOG",
	.target		= ipt_log_target,
	.targetsize	= sizeof(struct ipt_log_info),
	.checkentry	= ipt_log_checkentry,
	.me		= THIS_MODULE,
};

static struct nf_logger ipt_log_logger ={
	.name		= "ipt_LOG",
	.logfn		= &ipt_log_packet,
	.me		= THIS_MODULE,
};

static int __init ipt_log_init(void)
{
	int ret;

	ret = ipt_register_target(&ipt_log_reg);
	if (ret < 0)
		return ret;
	if (nf_log_register(PF_INET, &ipt_log_logger) < 0) {
		printk(KERN_WARNING "ipt_LOG: not logging via system console "
		       "since somebody else already registered for PF_INET\n");
		/* we cannot make module load fail here, since otherwise
		 * iptables userspace would abort */
	}
	
	return 0;
}

static void __exit ipt_log_fini(void)
{
	nf_log_unregister_logger(&ipt_log_logger);
	ipt_unregister_target(&ipt_log_reg);
}

module_init(ipt_log_init);
module_exit(ipt_log_fini);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This is a module which is used for logging packets.
	3	*/
	4
	5	/* (C) 1999-2001 Paul `Rusty' Russell
	6	* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/spinlock.h>
	15	#include <linux/skbuff.h>
	16	#include <linux/ip.h>
	17	#include <net/icmp.h>
	18	#include <net/udp.h>
	19	#include <net/tcp.h>
	20	#include <net/route.h>
	21
	22	#include <linux/netfilter.h>
	23	#include <linux/netfilter_ipv4/ip_tables.h>
	24	#include <linux/netfilter_ipv4/ipt_LOG.h>
	25
	26	MODULE_LICENSE("GPL");
	27	MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
	28	MODULE_DESCRIPTION("iptables syslog logging module");
	29
1da177e4 LT	30	#if 0
	31	#define DEBUGP printk
	32	#else
	33	#define DEBUGP(format, args...)
	34	#endif
	35
	36	/* Use lock to serialize, so printks don't overlap */
	37	static DEFINE_SPINLOCK(log_lock);
	38
	39	/* One level of recursion won't kill us */
608c8e4f	40	static void dump_packet(const struct nf_loginfo *info,
1da177e4 LT	41	const struct sk_buff *skb,
	42	unsigned int iphoff)
	43	{
	44	struct iphdr _iph, *ih;
608c8e4f HW	45	unsigned int logflags;
	46
	47	if (info->type == NF_LOG_TYPE_LOG)
	48	logflags = info->u.log.logflags;
	49	else
	50	logflags = NF_LOG_MASK;
1da177e4 LT	51
	52	ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
	53	if (ih == NULL) {
	54	printk("TRUNCATED");
	55	return;
	56	}
	57
	58	/* Important fields:
	59	* TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */
	60	/* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */
	61	printk("SRC=%u.%u.%u.%u DST=%u.%u.%u.%u ",
	62	NIPQUAD(ih->saddr), NIPQUAD(ih->daddr));
	63
	64	/* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */
	65	printk("LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
	66	ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK,
	67	ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id));
	68
	69	/* Max length: 6 "CE DF MF " */
	70	if (ntohs(ih->frag_off) & IP_CE)
	71	printk("CE ");
	72	if (ntohs(ih->frag_off) & IP_DF)
	73	printk("DF ");
	74	if (ntohs(ih->frag_off) & IP_MF)
	75	printk("MF ");
	76
	77	/* Max length: 11 "FRAG:65535 " */
	78	if (ntohs(ih->frag_off) & IP_OFFSET)
	79	printk("FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);
	80
608c8e4f	81	if ((logflags & IPT_LOG_IPOPT)
1da177e4 LT	82	&& ih->ihl * 4 > sizeof(struct iphdr)) {
	83	unsigned char _opt[4 * 15 - sizeof(struct iphdr)], *op;
	84	unsigned int i, optsize;
	85
	86	optsize = ih->ihl * 4 - sizeof(struct iphdr);
	87	op = skb_header_pointer(skb, iphoff+sizeof(_iph),
	88	optsize, _opt);
	89	if (op == NULL) {
	90	printk("TRUNCATED");
	91	return;
	92	}
	93
	94	/* Max length: 127 "OPT (" 1542chars ") " */
	95	printk("OPT (");
	96	for (i = 0; i < optsize; i++)
	97	printk("%02X", op[i]);
	98	printk(") ");
	99	}
	100
	101	switch (ih->protocol) {
	102	case IPPROTO_TCP: {
	103	struct tcphdr _tcph, *th;
	104
	105	/* Max length: 10 "PROTO=TCP " */
	106	printk("PROTO=TCP ");
	107
	108	if (ntohs(ih->frag_off) & IP_OFFSET)
	109	break;
	110
	111	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	112	th = skb_header_pointer(skb, iphoff + ih->ihl * 4,
	113	sizeof(_tcph), &_tcph);
	114	if (th == NULL) {
	115	printk("INCOMPLETE [%u bytes] ",
	116	skb->len - iphoff - ih->ihl*4);
	117	break;
	118	}
	119
	120	/* Max length: 20 "SPT=65535 DPT=65535 " */
	121	printk("SPT=%u DPT=%u ",
	122	ntohs(th->source), ntohs(th->dest));
	123	/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
608c8e4f	124	if (logflags & IPT_LOG_TCPSEQ)
1da177e4 LT	125	printk("SEQ=%u ACK=%u ",
	126	ntohl(th->seq), ntohl(th->ack_seq));
	127	/* Max length: 13 "WINDOW=65535 " */
	128	printk("WINDOW=%u ", ntohs(th->window));
	129	/* Max length: 9 "RES=0x3F " */
	130	printk("RES=0x%02x ", (u8)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22));
	131	/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
	132	if (th->cwr)
	133	printk("CWR ");
	134	if (th->ece)
	135	printk("ECE ");
	136	if (th->urg)
	137	printk("URG ");
	138	if (th->ack)
	139	printk("ACK ");
	140	if (th->psh)
	141	printk("PSH ");
	142	if (th->rst)
	143	printk("RST ");
	144	if (th->syn)
	145	printk("SYN ");
	146	if (th->fin)
	147	printk("FIN ");
	148	/* Max length: 11 "URGP=65535 " */
	149	printk("URGP=%u ", ntohs(th->urg_ptr));
	150
608c8e4f	151	if ((logflags & IPT_LOG_TCPOPT)
1da177e4 LT	152	&& th->doff * 4 > sizeof(struct tcphdr)) {
	153	unsigned char _opt[4 * 15 - sizeof(struct tcphdr)];
	154	unsigned char *op;
	155	unsigned int i, optsize;
	156
	157	optsize = th->doff * 4 - sizeof(struct tcphdr);
	158	op = skb_header_pointer(skb,
	159	iphoff+ih->ihl*4+sizeof(_tcph),
	160	optsize, _opt);
	161	if (op == NULL) {
	162	printk("TRUNCATED");
	163	return;
	164	}
	165
	166	/* Max length: 127 "OPT (" 1542chars ") " */
	167	printk("OPT (");
	168	for (i = 0; i < optsize; i++)
	169	printk("%02X", op[i]);
	170	printk(") ");
	171	}
	172	break;
	173	}
ba4e58ec GR	174	case IPPROTO_UDP:
ba4e58ec GR	175	case IPPROTO_UDPLITE: {
1da177e4 LT	176	struct udphdr _udph, *uh;
1da177e4 LT	177
ba4e58ec GR	178	if (ih->protocol == IPPROTO_UDP)
	179	/* Max length: 10 "PROTO=UDP " */
	180	printk("PROTO=UDP " );
	181	else /* Max length: 14 "PROTO=UDPLITE " */
	182	printk("PROTO=UDPLITE ");
1da177e4 LT	183
	184	if (ntohs(ih->frag_off) & IP_OFFSET)
	185	break;
	186
	187	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	188	uh = skb_header_pointer(skb, iphoff+ih->ihl*4,
	189	sizeof(_udph), &_udph);
	190	if (uh == NULL) {
	191	printk("INCOMPLETE [%u bytes] ",
	192	skb->len - iphoff - ih->ihl*4);
	193	break;
	194	}
	195
	196	/* Max length: 20 "SPT=65535 DPT=65535 " */
	197	printk("SPT=%u DPT=%u LEN=%u ",
	198	ntohs(uh->source), ntohs(uh->dest),
	199	ntohs(uh->len));
	200	break;
	201	}
	202	case IPPROTO_ICMP: {
	203	struct icmphdr _icmph, *ich;
9b5b5cff	204	static const size_t required_len[NR_ICMP_TYPES+1]
1da177e4 LT	205	= { [ICMP_ECHOREPLY] = 4,
	206	[ICMP_DEST_UNREACH]
	207	= 8 + sizeof(struct iphdr),
	208	[ICMP_SOURCE_QUENCH]
	209	= 8 + sizeof(struct iphdr),
	210	[ICMP_REDIRECT]
	211	= 8 + sizeof(struct iphdr),
	212	[ICMP_ECHO] = 4,
	213	[ICMP_TIME_EXCEEDED]
	214	= 8 + sizeof(struct iphdr),
	215	[ICMP_PARAMETERPROB]
	216	= 8 + sizeof(struct iphdr),
	217	[ICMP_TIMESTAMP] = 20,
	218	[ICMP_TIMESTAMPREPLY] = 20,
	219	[ICMP_ADDRESS] = 12,
	220	[ICMP_ADDRESSREPLY] = 12 };
	221
	222	/* Max length: 11 "PROTO=ICMP " */
	223	printk("PROTO=ICMP ");
	224
	225	if (ntohs(ih->frag_off) & IP_OFFSET)
	226	break;
	227
	228	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	229	ich = skb_header_pointer(skb, iphoff + ih->ihl * 4,
	230	sizeof(_icmph), &_icmph);
	231	if (ich == NULL) {
	232	printk("INCOMPLETE [%u bytes] ",
	233	skb->len - iphoff - ih->ihl*4);
	234	break;
	235	}
	236
	237	/* Max length: 18 "TYPE=255 CODE=255 " */
	238	printk("TYPE=%u CODE=%u ", ich->type, ich->code);
	239
	240	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	241	if (ich->type <= NR_ICMP_TYPES
	242	&& required_len[ich->type]
	243	&& skb->len-iphoff-ih->ihl*4 < required_len[ich->type]) {
	244	printk("INCOMPLETE [%u bytes] ",
	245	skb->len - iphoff - ih->ihl*4);
	246	break;
	247	}
	248
	249	switch (ich->type) {
	250	case ICMP_ECHOREPLY:
	251	case ICMP_ECHO:
	252	/* Max length: 19 "ID=65535 SEQ=65535 " */
	253	printk("ID=%u SEQ=%u ",
	254	ntohs(ich->un.echo.id),
	255	ntohs(ich->un.echo.sequence));
	256	break;
	257
	258	case ICMP_PARAMETERPROB:
	259	/* Max length: 14 "PARAMETER=255 " */
	260	printk("PARAMETER=%u ",
	261	ntohl(ich->un.gateway) >> 24);
	262	break;
	263	case ICMP_REDIRECT:
	264	/* Max length: 24 "GATEWAY=255.255.255.255 " */
	265	printk("GATEWAY=%u.%u.%u.%u ",
	266	NIPQUAD(ich->un.gateway));
	267	/* Fall through */
	268	case ICMP_DEST_UNREACH:
269	case ICMP_SOURCE_QUENCH:
270	case ICMP_TIME_EXCEEDED:
271	/* Max length: 3+maxlen */
272	if (!iphoff) { /* Only recurse once. */
273	printk("[");
274	dump_packet(info, skb,
275	iphoff + ih->ihl*4+sizeof(_icmph));
276	printk("] ");
277	}
278
279	/* Max length: 10 "MTU=65535 " */
280	if (ich->type == ICMP_DEST_UNREACH
281	&& ich->code == ICMP_FRAG_NEEDED)
282	printk("MTU=%u ", ntohs(ich->un.frag.mtu));
283	}
284	break;
285	}
286	/* Max Length */
287	case IPPROTO_AH: {
288	struct ip_auth_hdr _ahdr, *ah;
289
290	if (ntohs(ih->frag_off) & IP_OFFSET)
291	break;
292
293	/* Max length: 9 "PROTO=AH " */
294	printk("PROTO=AH ");
295
296	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
297	ah = skb_header_pointer(skb, iphoff+ih->ihl*4,
298	sizeof(_ahdr), &_ahdr);
299	if (ah == NULL) {
300	printk("INCOMPLETE [%u bytes] ",
301	skb->len - iphoff - ih->ihl*4);
302	break;
303	}
304
305	/* Length: 15 "SPI=0xF1234567 " */
306	printk("SPI=0x%x ", ntohl(ah->spi));
307	break;
308	}
309	case IPPROTO_ESP: {
310	struct ip_esp_hdr _esph, *eh;
311
312	/* Max length: 10 "PROTO=ESP " */
313	printk("PROTO=ESP ");
314
315	if (ntohs(ih->frag_off) & IP_OFFSET)
316	break;
317
318	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
319	eh = skb_header_pointer(skb, iphoff+ih->ihl*4,
320	sizeof(_esph), &_esph);
321	if (eh == NULL) {
322	printk("INCOMPLETE [%u bytes] ",
323	skb->len - iphoff - ih->ihl*4);
324	break;
325	}
326
327	/* Length: 15 "SPI=0xF1234567 " */
328	printk("SPI=0x%x ", ntohl(eh->spi));
329	break;
330	}
331	/* Max length: 10 "PROTO 255 " */
332	default:
333	printk("PROTO=%u ", ih->protocol);
334	}
335
336	/* Max length: 15 "UID=4294967295 " */
608c8e4f	337	if ((logflags & IPT_LOG_UID) && !iphoff && skb->sk) {
1da177e4 LT	338	read_lock_bh(&skb->sk->sk_callback_lock);
	339	if (skb->sk->sk_socket && skb->sk->sk_socket->file)
	340	printk("UID=%u ", skb->sk->sk_socket->file->f_uid);
	341	read_unlock_bh(&skb->sk->sk_callback_lock);
	342	}
	343
	344	/* Proto Max log string length */
	345	/* IP: 40+46+6+11+127 = 230 */
	346	/* TCP: 10+max(25,20+30+13+9+32+11+127) = 252 */
	347	/* UDP: 10+max(25,20) = 35 */
ba4e58ec	348	/* UDPLITE: 14+max(25,20) = 39 */
1da177e4 LT	349	/* ICMP: 11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */
	350	/* ESP: 10+max(25)+15 = 50 */
	351	/* AH: 9+max(25)+15 = 49 */
	352	/* unknown: 10 */
	353
	354	/* (ICMP allows recursion one level deep) */
	355	/* maxlen = IP + ICMP + IP + max(TCP,UDP,ICMP,unknown) */
	356	/* maxlen = 230+ 91 + 230 + 252 = 803 */
	357	}
	358
d127e94a	359	static struct nf_loginfo default_loginfo = {
608c8e4f HW	360	.type = NF_LOG_TYPE_LOG,
	361	.u = {
	362	.log = {
	363	.level = 0,
	364	.logflags = NF_LOG_MASK,
	365	},
	366	},
	367	};
	368
1da177e4	369	static void
608c8e4f HW	370	ipt_log_packet(unsigned int pf,
608c8e4f HW	371	unsigned int hooknum,
1da177e4 LT	372	const struct sk_buff *skb,
	373	const struct net_device *in,
	374	const struct net_device *out,
608c8e4f	375	const struct nf_loginfo *loginfo,
1da177e4 LT	376	const char *prefix)
1da177e4 LT	377	{
608c8e4f HW	378	if (!loginfo)
	379	loginfo = &default_loginfo;
	380
1da177e4	381	spin_lock_bh(&log_lock);
608c8e4f HW	382	printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
608c8e4f HW	383	prefix,
1da177e4 LT	384	in ? in->name : "",
	385	out ? out->name : "");
	386	#ifdef CONFIG_BRIDGE_NETFILTER
	387	if (skb->nf_bridge) {
	388	struct net_device *physindev = skb->nf_bridge->physindev;
	389	struct net_device *physoutdev = skb->nf_bridge->physoutdev;
	390
	391	if (physindev && in != physindev)
	392	printk("PHYSIN=%s ", physindev->name);
	393	if (physoutdev && out != physoutdev)
	394	printk("PHYSOUT=%s ", physoutdev->name);
	395	}
	396	#endif
	397
	398	if (in && !out) {
	399	/* MAC logging for input chain only. */
	400	printk("MAC=");
	401	if (skb->dev && skb->dev->hard_header_len
	402	&& skb->mac.raw != (void*)skb->nh.iph) {
	403	int i;
	404	unsigned char *p = skb->mac.raw;
	405	for (i = 0; i < skb->dev->hard_header_len; i++,p++)
	406	printk("%02x%c", *p,
	407	i==skb->dev->hard_header_len - 1
	408	? ' ':':');
	409	} else
	410	printk(" ");
	411	}
	412
	413	dump_packet(loginfo, skb, 0);
	414	printk("\n");
	415	spin_unlock_bh(&log_lock);
	416	}
	417
	418	static unsigned int
	419	ipt_log_target(struct sk_buff **pskb,
	420	const struct net_device *in,
	421	const struct net_device *out,
	422	unsigned int hooknum,
c4986734	423	const struct xt_target *target,
fe1cb108	424	const void *targinfo)
1da177e4 LT	425	{
1da177e4 LT	426	const struct ipt_log_info *loginfo = targinfo;
608c8e4f	427	struct nf_loginfo li;
1da177e4	428
608c8e4f HW	429	li.type = NF_LOG_TYPE_LOG;
	430	li.u.log.level = loginfo->level;
	431	li.u.log.logflags = loginfo->logflags;
1da177e4	432
baf7b1e1 PM	433	ipt_log_packet(PF_INET, hooknum, *pskb, in, out, &li,
baf7b1e1 PM	434	loginfo->prefix);
608c8e4f	435	return IPT_CONTINUE;
1da177e4 LT	436	}
	437
	438	static int ipt_log_checkentry(const char *tablename,
2e4e6a17	439	const void *e,
c4986734	440	const struct xt_target *target,
1da177e4	441	void *targinfo,
1da177e4 LT	442	unsigned int hook_mask)
	443	{
	444	const struct ipt_log_info *loginfo = targinfo;
	445
1da177e4 LT	446	if (loginfo->level >= 8) {
	447	DEBUGP("LOG: level %u >= 8\n", loginfo->level);
	448	return 0;
	449	}
1da177e4 LT	450	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
	451	DEBUGP("LOG: prefix term %i\n",
	452	loginfo->prefix[sizeof(loginfo->prefix)-1]);
	453	return 0;
	454	}
1da177e4 LT	455	return 1;
	456	}
	457
	458	static struct ipt_target ipt_log_reg = {
	459	.name = "LOG",
	460	.target = ipt_log_target,
1d5cd909	461	.targetsize = sizeof(struct ipt_log_info),
1da177e4 LT	462	.checkentry = ipt_log_checkentry,
	463	.me = THIS_MODULE,
	464	};
	465
608c8e4f HW	466	static struct nf_logger ipt_log_logger ={
	467	.name = "ipt_LOG",
	468	.logfn = &ipt_log_packet,
	469	.me = THIS_MODULE,
	470	};
	471
65b4b4e8	472	static int __init ipt_log_init(void)
1da177e4	473	{
e1fd0586 JE	474	int ret;
	475
	476	ret = ipt_register_target(&ipt_log_reg);
	477	if (ret < 0)
	478	return ret;
608c8e4f HW	479	if (nf_log_register(PF_INET, &ipt_log_logger) < 0) {
	480	printk(KERN_WARNING "ipt_LOG: not logging via system console "
	481	"since somebody else already registered for PF_INET\n");
	482	/* we cannot make module load fail here, since otherwise
	483	* iptables userspace would abort */
	484	}
1da177e4 LT	485
	486	return 0;
	487	}
	488
65b4b4e8	489	static void __exit ipt_log_fini(void)
1da177e4	490	{
608c8e4f	491	nf_log_unregister_logger(&ipt_log_logger);
1da177e4 LT	492	ipt_unregister_target(&ipt_log_reg);
	493	}
	494
65b4b4e8 AM	495	module_init(ipt_log_init);
65b4b4e8 AM	496	module_exit(ipt_log_fini);