[net-next-2.6.git] / net / ipv6 / netfilter / ip6t_LOG.c

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

/* (C) 2001 Jan Rekorajski <baggins@pld.org.pl>
 * (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/moduleparam.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/ip.h>
#include <linux/spinlock.h>
#include <linux/icmpv6.h>
#include <net/udp.h>
#include <net/tcp.h>
#include <net/ipv6.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv6/ip6_tables.h>

MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
MODULE_DESCRIPTION("IP6 tables LOG target module");
MODULE_LICENSE("GPL");

struct in_device;
#include <net/route.h>
#include <linux/netfilter_ipv6/ip6t_LOG.h>

#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 ip6hoff,
			int recurse)
{
	u_int8_t currenthdr;
	int fragment;
	struct ipv6hdr _ip6h, *ih;
	unsigned int ptr;
	unsigned int hdrlen = 0;
	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, ip6hoff, sizeof(_ip6h), &_ip6h);
	if (ih == NULL) {
		printk("TRUNCATED");
		return;
	}

	/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
	printk("SRC=" NIP6_FMT " DST=" NIP6_FMT " ", NIP6(ih->saddr), NIP6(ih->daddr));

	/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
	printk("LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
	       ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
	       (ntohl(*(u_int32_t *)ih) & 0x0ff00000) >> 20,
	       ih->hop_limit,
	       (ntohl(*(u_int32_t *)ih) & 0x000fffff));

	fragment = 0;
	ptr = ip6hoff + sizeof(struct ipv6hdr);
	currenthdr = ih->nexthdr;
	while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) {
		struct ipv6_opt_hdr _hdr, *hp;

		hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
		if (hp == NULL) {
			printk("TRUNCATED");
			return;
		}

		/* Max length: 48 "OPT (...) " */
		if (logflags & IP6T_LOG_IPOPT)
			printk("OPT ( ");

		switch (currenthdr) {
		case IPPROTO_FRAGMENT: {
			struct frag_hdr _fhdr, *fh;

			printk("FRAG:");
			fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
						&_fhdr);
			if (fh == NULL) {
				printk("TRUNCATED ");
				return;
			}

			/* Max length: 6 "65535 " */
			printk("%u ", ntohs(fh->frag_off) & 0xFFF8);

			/* Max length: 11 "INCOMPLETE " */
			if (fh->frag_off & htons(0x0001))
				printk("INCOMPLETE ");

			printk("ID:%08x ", ntohl(fh->identification));

			if (ntohs(fh->frag_off) & 0xFFF8)
				fragment = 1;

			hdrlen = 8;

			break;
		}
		case IPPROTO_DSTOPTS:
		case IPPROTO_ROUTING:
		case IPPROTO_HOPOPTS:
			if (fragment) {
				if (logflags & IP6T_LOG_IPOPT)
					printk(")");
				return;
			}
			hdrlen = ipv6_optlen(hp);
			break;
		/* Max Length */
		case IPPROTO_AH:
			if (logflags & IP6T_LOG_IPOPT) {
				struct ip_auth_hdr _ahdr, *ah;

				/* Max length: 3 "AH " */
				printk("AH ");

				if (fragment) {
					printk(")");
					return;
				}

				ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
							&_ahdr);
				if (ah == NULL) {
					/*
					 * Max length: 26 "INCOMPLETE [65535 	
					 *  bytes] )"
					 */
					printk("INCOMPLETE [%u bytes] )",
					       skb->len - ptr);
					return;
				}

				/* Length: 15 "SPI=0xF1234567 */
				printk("SPI=0x%x ", ntohl(ah->spi));

			}

			hdrlen = (hp->hdrlen+2)<<2;
			break;
		case IPPROTO_ESP:
			if (logflags & IP6T_LOG_IPOPT) {
				struct ip_esp_hdr _esph, *eh;

				/* Max length: 4 "ESP " */
				printk("ESP ");

				if (fragment) {
					printk(")");
					return;
				}

				/*
				 * Max length: 26 "INCOMPLETE [65535 bytes] )"
				 */
				eh = skb_header_pointer(skb, ptr, sizeof(_esph),
							&_esph);
				if (eh == NULL) {
					printk("INCOMPLETE [%u bytes] )",
					       skb->len - ptr);
					return;
				}

				/* Length: 16 "SPI=0xF1234567 )" */
				printk("SPI=0x%x )", ntohl(eh->spi) );

			}
			return;
		default:
			/* Max length: 20 "Unknown Ext Hdr 255" */
			printk("Unknown Ext Hdr %u", currenthdr);
			return;
		}
		if (logflags & IP6T_LOG_IPOPT)
			printk(") ");

		currenthdr = hp->nexthdr;
		ptr += hdrlen;
	}

	switch (currenthdr) {
	case IPPROTO_TCP: {
		struct tcphdr _tcph, *th;

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

		if (fragment)
			break;

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

		/* 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 & IP6T_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=0x3C " */
		printk("RES=0x%02x ", (u_int8_t)(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 & IP6T_LOG_TCPOPT)
		    && th->doff * 4 > sizeof(struct tcphdr)) {
			u_int8_t _opt[60 - sizeof(struct tcphdr)], *op;
			unsigned int i;
			unsigned int optsize = th->doff * 4
					       - sizeof(struct tcphdr);

			op = skb_header_pointer(skb,
						ptr + sizeof(struct tcphdr),
						optsize, _opt);
			if (op == NULL) {
				printk("OPT (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 (currenthdr == IPPROTO_UDP)
			/* Max length: 10 "PROTO=UDP "     */
			printk("PROTO=UDP " );
		else	/* Max length: 14 "PROTO=UDPLITE " */
			printk("PROTO=UDPLITE ");

		if (fragment)
			break;

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

		/* 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_ICMPV6: {
		struct icmp6hdr _icmp6h, *ic;

		/* Max length: 13 "PROTO=ICMPv6 " */
		printk("PROTO=ICMPv6 ");

		if (fragment)
			break;

		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
		ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
		if (ic == NULL) {
			printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
			return;
		}

		/* Max length: 18 "TYPE=255 CODE=255 " */
		printk("TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);

		switch (ic->icmp6_type) {
		case ICMPV6_ECHO_REQUEST:
		case ICMPV6_ECHO_REPLY:
			/* Max length: 19 "ID=65535 SEQ=65535 " */
			printk("ID=%u SEQ=%u ",
				ntohs(ic->icmp6_identifier),
				ntohs(ic->icmp6_sequence));
			break;
		case ICMPV6_MGM_QUERY:
		case ICMPV6_MGM_REPORT:
		case ICMPV6_MGM_REDUCTION:
			break;

		case ICMPV6_PARAMPROB:
			/* Max length: 17 "POINTER=ffffffff " */
			printk("POINTER=%08x ", ntohl(ic->icmp6_pointer));
			/* Fall through */
		case ICMPV6_DEST_UNREACH:
		case ICMPV6_PKT_TOOBIG:
		case ICMPV6_TIME_EXCEED:
			/* Max length: 3+maxlen */
			if (recurse) {
				printk("[");
				dump_packet(info, skb, ptr + sizeof(_icmp6h),
					    0);
				printk("] ");
			}

			/* Max length: 10 "MTU=65535 " */
			if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
				printk("MTU=%u ", ntohl(ic->icmp6_mtu));
		}
		break;
	}
	/* Max length: 10 "PROTO=255 " */
	default:
		printk("PROTO=%u ", currenthdr);
	}

	/* Max length: 15 "UID=4294967295 " */
	if ((logflags & IP6T_LOG_UID) && recurse && 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);
	}
}

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

static void
ip6t_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 : "");
	if (in && !out) {
		unsigned int len;
		/* MAC logging for input chain only. */
		printk("MAC=");
		if (skb->dev && (len = skb->dev->hard_header_len) &&
		    skb->mac.raw != skb->nh.raw) {
			unsigned char *p = skb->mac.raw;
			int i;

			if (skb->dev->type == ARPHRD_SIT &&
			    (p -= ETH_HLEN) < skb->head)
				p = NULL;

			if (p != NULL) {
				for (i = 0; i < len; i++)
					printk("%02x%s", p[i],
					       i == len - 1 ? "" : ":");
			}
			printk(" ");

			if (skb->dev->type == ARPHRD_SIT) {
				struct iphdr *iph = (struct iphdr *)skb->mac.raw;
				printk("TUNNEL=%u.%u.%u.%u->%u.%u.%u.%u ",
				       NIPQUAD(iph->saddr),
				       NIPQUAD(iph->daddr));
			}
		} else
			printk(" ");
	}

	dump_packet(loginfo, skb, (u8*)skb->nh.ipv6h - skb->data, 1);
	printk("\n");
	spin_unlock_bh(&log_lock);
}

static unsigned int
ip6t_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 ip6t_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;

	if (loginfo->logflags & IP6T_LOG_NFLOG)
		nf_log_packet(PF_INET6, hooknum, *pskb, in, out, &li,
		              "%s", loginfo->prefix);
	else
		ip6t_log_packet(PF_INET6, hooknum, *pskb, in, out, &li,
		                loginfo->prefix);

	return IP6T_CONTINUE;
}


static int ip6t_log_checkentry(const char *tablename,
			       const void *entry,
			       const struct xt_target *target,
			       void *targinfo,
			       unsigned int hook_mask)
{
	const struct ip6t_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 ip6t_target ip6t_log_reg = {
	.name 		= "LOG",
	.target 	= ip6t_log_target, 
	.targetsize	= sizeof(struct ip6t_log_info),
	.checkentry	= ip6t_log_checkentry, 
	.me 		= THIS_MODULE,
};

static struct nf_logger ip6t_logger = {
	.name		= "ip6t_LOG",
	.logfn		= &ip6t_log_packet,
	.me		= THIS_MODULE,
};

static int __init ip6t_log_init(void)
{
	if (ip6t_register_target(&ip6t_log_reg))
		return -EINVAL;
	if (nf_log_register(PF_INET6, &ip6t_logger) < 0) {
		printk(KERN_WARNING "ip6t_LOG: not logging via system console "
		       "since somebody else already registered for PF_INET6\n");
		/* we cannot make module load fail here, since otherwise
		 * ip6tables userspace would abort */
	}

	return 0;
}

static void __exit ip6t_log_fini(void)
{
	nf_log_unregister_logger(&ip6t_logger);
	ip6t_unregister_target(&ip6t_log_reg);
}

module_init(ip6t_log_init);
module_exit(ip6t_log_fini);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This is a module which is used for logging packets.
	3	*/
	4
	5	/* (C) 2001 Jan Rekorajski <baggins@pld.org.pl>
	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/moduleparam.h>
	15	#include <linux/skbuff.h>
14c85021	16	#include <linux/if_arp.h>
1da177e4 LT	17	#include <linux/ip.h>
	18	#include <linux/spinlock.h>
	19	#include <linux/icmpv6.h>
	20	#include <net/udp.h>
	21	#include <net/tcp.h>
	22	#include <net/ipv6.h>
	23	#include <linux/netfilter.h>
	24	#include <linux/netfilter_ipv6/ip6_tables.h>
	25
	26	MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
	27	MODULE_DESCRIPTION("IP6 tables LOG target module");
	28	MODULE_LICENSE("GPL");
	29
1da177e4 LT	30	struct in_device;
	31	#include <net/route.h>
	32	#include <linux/netfilter_ipv6/ip6t_LOG.h>
	33
	34	#if 0
	35	#define DEBUGP printk
	36	#else
	37	#define DEBUGP(format, args...)
	38	#endif
	39
	40	/* Use lock to serialize, so printks don't overlap */
	41	static DEFINE_SPINLOCK(log_lock);
	42
	43	/* One level of recursion won't kill us */
608c8e4f	44	static void dump_packet(const struct nf_loginfo *info,
1da177e4 LT	45	const struct sk_buff *skb, unsigned int ip6hoff,
	46	int recurse)
	47	{
	48	u_int8_t currenthdr;
	49	int fragment;
	50	struct ipv6hdr _ip6h, *ih;
	51	unsigned int ptr;
	52	unsigned int hdrlen = 0;
608c8e4f HW	53	unsigned int logflags;
	54
	55	if (info->type == NF_LOG_TYPE_LOG)
	56	logflags = info->u.log.logflags;
	57	else
	58	logflags = NF_LOG_MASK;
1da177e4 LT	59
	60	ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
	61	if (ih == NULL) {
	62	printk("TRUNCATED");
	63	return;
	64	}
	65
46b86a2d JP	66	/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
46b86a2d JP	67	printk("SRC=" NIP6_FMT " DST=" NIP6_FMT " ", NIP6(ih->saddr), NIP6(ih->daddr));
1da177e4 LT	68
	69	/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
	70	printk("LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
	71	ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
	72	(ntohl((u_int32_t )ih) & 0x0ff00000) >> 20,
	73	ih->hop_limit,
	74	(ntohl((u_int32_t )ih) & 0x000fffff));
	75
	76	fragment = 0;
	77	ptr = ip6hoff + sizeof(struct ipv6hdr);
	78	currenthdr = ih->nexthdr;
	79	while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) {
	80	struct ipv6_opt_hdr _hdr, *hp;
	81
	82	hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
	83	if (hp == NULL) {
	84	printk("TRUNCATED");
	85	return;
	86	}
	87
	88	/* Max length: 48 "OPT (...) " */
608c8e4f	89	if (logflags & IP6T_LOG_IPOPT)
1da177e4 LT	90	printk("OPT ( ");
	91
	92	switch (currenthdr) {
	93	case IPPROTO_FRAGMENT: {
	94	struct frag_hdr _fhdr, *fh;
	95
	96	printk("FRAG:");
	97	fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
	98	&_fhdr);
	99	if (fh == NULL) {
	100	printk("TRUNCATED ");
	101	return;
	102	}
	103
	104	/* Max length: 6 "65535 " */
	105	printk("%u ", ntohs(fh->frag_off) & 0xFFF8);
	106
	107	/* Max length: 11 "INCOMPLETE " */
	108	if (fh->frag_off & htons(0x0001))
	109	printk("INCOMPLETE ");
	110
	111	printk("ID:%08x ", ntohl(fh->identification));
	112
	113	if (ntohs(fh->frag_off) & 0xFFF8)
	114	fragment = 1;
	115
	116	hdrlen = 8;
	117
	118	break;
	119	}
	120	case IPPROTO_DSTOPTS:
	121	case IPPROTO_ROUTING:
	122	case IPPROTO_HOPOPTS:
	123	if (fragment) {
608c8e4f	124	if (logflags & IP6T_LOG_IPOPT)
1da177e4 LT	125	printk(")");
	126	return;
	127	}
	128	hdrlen = ipv6_optlen(hp);
	129	break;
	130	/* Max Length */
	131	case IPPROTO_AH:
608c8e4f	132	if (logflags & IP6T_LOG_IPOPT) {
1da177e4 LT	133	struct ip_auth_hdr _ahdr, *ah;
	134
	135	/* Max length: 3 "AH " */
	136	printk("AH ");
	137
	138	if (fragment) {
	139	printk(")");
	140	return;
	141	}
	142
	143	ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
	144	&_ahdr);
	145	if (ah == NULL) {
	146	/*
	147	* Max length: 26 "INCOMPLETE [65535
	148	* bytes] )"
	149	*/
	150	printk("INCOMPLETE [%u bytes] )",
	151	skb->len - ptr);
	152	return;
	153	}
	154
	155	/* Length: 15 "SPI=0xF1234567 */
	156	printk("SPI=0x%x ", ntohl(ah->spi));
	157
	158	}
	159
	160	hdrlen = (hp->hdrlen+2)<<2;
	161	break;
	162	case IPPROTO_ESP:
608c8e4f	163	if (logflags & IP6T_LOG_IPOPT) {
1da177e4 LT	164	struct ip_esp_hdr _esph, *eh;
	165
	166	/* Max length: 4 "ESP " */
	167	printk("ESP ");
	168
	169	if (fragment) {
	170	printk(")");
	171	return;
	172	}
	173
	174	/*
	175	* Max length: 26 "INCOMPLETE [65535 bytes] )"
	176	*/
	177	eh = skb_header_pointer(skb, ptr, sizeof(_esph),
	178	&_esph);
	179	if (eh == NULL) {
	180	printk("INCOMPLETE [%u bytes] )",
	181	skb->len - ptr);
	182	return;
	183	}
	184
	185	/* Length: 16 "SPI=0xF1234567 )" */
	186	printk("SPI=0x%x )", ntohl(eh->spi) );
	187
	188	}
	189	return;
	190	default:
	191	/* Max length: 20 "Unknown Ext Hdr 255" */
	192	printk("Unknown Ext Hdr %u", currenthdr);
	193	return;
	194	}
608c8e4f	195	if (logflags & IP6T_LOG_IPOPT)
1da177e4 LT	196	printk(") ");
	197
	198	currenthdr = hp->nexthdr;
	199	ptr += hdrlen;
	200	}
	201
	202	switch (currenthdr) {
	203	case IPPROTO_TCP: {
	204	struct tcphdr _tcph, *th;
	205
	206	/* Max length: 10 "PROTO=TCP " */
	207	printk("PROTO=TCP ");
	208
	209	if (fragment)
	210	break;
	211
	212	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	213	th = skb_header_pointer(skb, ptr, sizeof(_tcph), &_tcph);
	214	if (th == NULL) {
	215	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
	216	return;
	217	}
	218
	219	/* Max length: 20 "SPT=65535 DPT=65535 " */
	220	printk("SPT=%u DPT=%u ",
	221	ntohs(th->source), ntohs(th->dest));
	222	/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
608c8e4f	223	if (logflags & IP6T_LOG_TCPSEQ)
1da177e4 LT	224	printk("SEQ=%u ACK=%u ",
	225	ntohl(th->seq), ntohl(th->ack_seq));
	226	/* Max length: 13 "WINDOW=65535 " */
	227	printk("WINDOW=%u ", ntohs(th->window));
	228	/* Max length: 9 "RES=0x3C " */
	229	printk("RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22));
	230	/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
	231	if (th->cwr)
	232	printk("CWR ");
	233	if (th->ece)
	234	printk("ECE ");
	235	if (th->urg)
	236	printk("URG ");
	237	if (th->ack)
	238	printk("ACK ");
	239	if (th->psh)
	240	printk("PSH ");
	241	if (th->rst)
	242	printk("RST ");
	243	if (th->syn)
	244	printk("SYN ");
	245	if (th->fin)
	246	printk("FIN ");
	247	/* Max length: 11 "URGP=65535 " */
	248	printk("URGP=%u ", ntohs(th->urg_ptr));
	249
608c8e4f	250	if ((logflags & IP6T_LOG_TCPOPT)
1da177e4 LT	251	&& th->doff * 4 > sizeof(struct tcphdr)) {
	252	u_int8_t _opt[60 - sizeof(struct tcphdr)], *op;
	253	unsigned int i;
	254	unsigned int optsize = th->doff * 4
	255	- sizeof(struct tcphdr);
	256
	257	op = skb_header_pointer(skb,
	258	ptr + sizeof(struct tcphdr),
	259	optsize, _opt);
	260	if (op == NULL) {
	261	printk("OPT (TRUNCATED)");
	262	return;
	263	}
	264
	265	/* Max length: 127 "OPT (" 1542chars ") " */
	266	printk("OPT (");
	267	for (i =0; i < optsize; i++)
	268	printk("%02X", op[i]);
	269	printk(") ");
	270	}
	271	break;
	272	}
ba4e58ec GR	273	case IPPROTO_UDP:
ba4e58ec GR	274	case IPPROTO_UDPLITE: {
1da177e4 LT	275	struct udphdr _udph, *uh;
1da177e4 LT	276
ba4e58ec GR	277	if (currenthdr == IPPROTO_UDP)
	278	/* Max length: 10 "PROTO=UDP " */
	279	printk("PROTO=UDP " );
	280	else /* Max length: 14 "PROTO=UDPLITE " */
	281	printk("PROTO=UDPLITE ");
1da177e4 LT	282
	283	if (fragment)
	284	break;
	285
	286	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	287	uh = skb_header_pointer(skb, ptr, sizeof(_udph), &_udph);
	288	if (uh == NULL) {
	289	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
	290	return;
	291	}
	292
	293	/* Max length: 20 "SPT=65535 DPT=65535 " */
	294	printk("SPT=%u DPT=%u LEN=%u ",
	295	ntohs(uh->source), ntohs(uh->dest),
	296	ntohs(uh->len));
	297	break;
	298	}
	299	case IPPROTO_ICMPV6: {
	300	struct icmp6hdr _icmp6h, *ic;
	301
	302	/* Max length: 13 "PROTO=ICMPv6 " */
	303	printk("PROTO=ICMPv6 ");
	304
	305	if (fragment)
	306	break;
	307
	308	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	309	ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
	310	if (ic == NULL) {
	311	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
	312	return;
	313	}
	314
	315	/* Max length: 18 "TYPE=255 CODE=255 " */
	316	printk("TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);
	317
	318	switch (ic->icmp6_type) {
	319	case ICMPV6_ECHO_REQUEST:
	320	case ICMPV6_ECHO_REPLY:
	321	/* Max length: 19 "ID=65535 SEQ=65535 " */
	322	printk("ID=%u SEQ=%u ",
	323	ntohs(ic->icmp6_identifier),
	324	ntohs(ic->icmp6_sequence));
	325	break;
	326	case ICMPV6_MGM_QUERY:
	327	case ICMPV6_MGM_REPORT:
	328	case ICMPV6_MGM_REDUCTION:
	329	break;
	330
	331	case ICMPV6_PARAMPROB:
	332	/* Max length: 17 "POINTER=ffffffff " */
	333	printk("POINTER=%08x ", ntohl(ic->icmp6_pointer));
	334	/* Fall through */
	335	case ICMPV6_DEST_UNREACH:
	336	case ICMPV6_PKT_TOOBIG:
	337	case ICMPV6_TIME_EXCEED:
	338	/* Max length: 3+maxlen */
	339	if (recurse) {
	340	printk("[");
	341	dump_packet(info, skb, ptr + sizeof(_icmp6h),
	342	0);
	343	printk("] ");
	344	}
	345
346	/* Max length: 10 "MTU=65535 " */
347	if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
348	printk("MTU=%u ", ntohl(ic->icmp6_mtu));
349	}
350	break;
351	}
352	/* Max length: 10 "PROTO=255 " */
353	default:
354	printk("PROTO=%u ", currenthdr);
355	}
356
357	/* Max length: 15 "UID=4294967295 " */
608c8e4f	358	if ((logflags & IP6T_LOG_UID) && recurse && skb->sk) {
1da177e4 LT	359	read_lock_bh(&skb->sk->sk_callback_lock);
	360	if (skb->sk->sk_socket && skb->sk->sk_socket->file)
	361	printk("UID=%u ", skb->sk->sk_socket->file->f_uid);
	362	read_unlock_bh(&skb->sk->sk_callback_lock);
	363	}
	364	}
	365
608c8e4f HW	366	static struct nf_loginfo default_loginfo = {
	367	.type = NF_LOG_TYPE_LOG,
	368	.u = {
	369	.log = {
	370	.level = 0,
	371	.logflags = NF_LOG_MASK,
	372	},
	373	},
	374	};
	375
1da177e4	376	static void
608c8e4f HW	377	ip6t_log_packet(unsigned int pf,
608c8e4f HW	378	unsigned int hooknum,
1da177e4 LT	379	const struct sk_buff *skb,
	380	const struct net_device *in,
	381	const struct net_device *out,
608c8e4f	382	const struct nf_loginfo *loginfo,
1da177e4 LT	383	const char *prefix)
1da177e4 LT	384	{
608c8e4f HW	385	if (!loginfo)
	386	loginfo = &default_loginfo;
	387
1da177e4	388	spin_lock_bh(&log_lock);
608c8e4f HW	389	printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
608c8e4f HW	390	prefix,
1da177e4 LT	391	in ? in->name : "",
	392	out ? out->name : "");
	393	if (in && !out) {
d3984a6b	394	unsigned int len;
1da177e4 LT	395	/* MAC logging for input chain only. */
1da177e4 LT	396	printk("MAC=");
d3984a6b	397	if (skb->dev && (len = skb->dev->hard_header_len) &&
047601bf PM	398	skb->mac.raw != skb->nh.raw) {
	399	unsigned char *p = skb->mac.raw;
	400	int i;
	401
	402	if (skb->dev->type == ARPHRD_SIT &&
	403	(p -= ETH_HLEN) < skb->head)
	404	p = NULL;
	405
d3984a6b PM	406	if (p != NULL) {
	407	for (i = 0; i < len; i++)
	408	printk("%02x%s", p[i],
	409	i == len - 1 ? "" : ":");
	410	}
047601bf PM	411	printk(" ");
	412
	413	if (skb->dev->type == ARPHRD_SIT) {
	414	struct iphdr iph = (struct iphdr )skb->mac.raw;
	415	printk("TUNNEL=%u.%u.%u.%u->%u.%u.%u.%u ",
	416	NIPQUAD(iph->saddr),
	417	NIPQUAD(iph->daddr));
1da177e4 LT	418	}
	419	} else
	420	printk(" ");
	421	}
	422
	423	dump_packet(loginfo, skb, (u8*)skb->nh.ipv6h - skb->data, 1);
	424	printk("\n");
	425	spin_unlock_bh(&log_lock);
	426	}
	427
	428	static unsigned int
	429	ip6t_log_target(struct sk_buff **pskb,
	430	const struct net_device *in,
	431	const struct net_device *out,
	432	unsigned int hooknum,
c4986734	433	const struct xt_target *target,
fe1cb108	434	const void *targinfo)
1da177e4 LT	435	{
1da177e4 LT	436	const struct ip6t_log_info *loginfo = targinfo;
608c8e4f HW	437	struct nf_loginfo li;
	438
	439	li.type = NF_LOG_TYPE_LOG;
	440	li.u.log.level = loginfo->level;
	441	li.u.log.logflags = loginfo->logflags;
1da177e4	442
bafac2a5 PM	443	if (loginfo->logflags & IP6T_LOG_NFLOG)
bafac2a5 PM	444	nf_log_packet(PF_INET6, hooknum, *pskb, in, out, &li,
5c170a09	445	"%s", loginfo->prefix);
bafac2a5 PM	446	else
	447	ip6t_log_packet(PF_INET6, hooknum, *pskb, in, out, &li,
	448	loginfo->prefix);
1da177e4 LT	449
	450	return IP6T_CONTINUE;
	451	}
	452
1da177e4 LT	453
1da177e4 LT	454	static int ip6t_log_checkentry(const char *tablename,
2e4e6a17	455	const void *entry,
c4986734	456	const struct xt_target *target,
1da177e4	457	void *targinfo,
1da177e4 LT	458	unsigned int hook_mask)
	459	{
	460	const struct ip6t_log_info *loginfo = targinfo;
	461
1da177e4 LT	462	if (loginfo->level >= 8) {
	463	DEBUGP("LOG: level %u >= 8\n", loginfo->level);
	464	return 0;
	465	}
1da177e4 LT	466	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
	467	DEBUGP("LOG: prefix term %i\n",
	468	loginfo->prefix[sizeof(loginfo->prefix)-1]);
	469	return 0;
	470	}
1da177e4 LT	471	return 1;
	472	}
	473
	474	static struct ip6t_target ip6t_log_reg = {
	475	.name = "LOG",
	476	.target = ip6t_log_target,
7f939713	477	.targetsize = sizeof(struct ip6t_log_info),
1da177e4 LT	478	.checkentry = ip6t_log_checkentry,
	479	.me = THIS_MODULE,
	480	};
	481
608c8e4f HW	482	static struct nf_logger ip6t_logger = {
	483	.name = "ip6t_LOG",
	484	.logfn = &ip6t_log_packet,
	485	.me = THIS_MODULE,
	486	};
	487
65b4b4e8	488	static int __init ip6t_log_init(void)
1da177e4 LT	489	{
	490	if (ip6t_register_target(&ip6t_log_reg))
	491	return -EINVAL;
608c8e4f HW	492	if (nf_log_register(PF_INET6, &ip6t_logger) < 0) {
	493	printk(KERN_WARNING "ip6t_LOG: not logging via system console "
	494	"since somebody else already registered for PF_INET6\n");
	495	/* we cannot make module load fail here, since otherwise
	496	* ip6tables userspace would abort */
	497	}
1da177e4 LT	498
	499	return 0;
	500	}
	501
65b4b4e8	502	static void __exit ip6t_log_fini(void)
1da177e4	503	{
608c8e4f	504	nf_log_unregister_logger(&ip6t_logger);
1da177e4 LT	505	ip6t_unregister_target(&ip6t_log_reg);
	506	}
	507
65b4b4e8 AM	508	module_init(ip6t_log_init);
65b4b4e8 AM	509	module_exit(ip6t_log_fini);