[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/x_tables.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(*(__be32 *)ih) & 0x0ff00000) >> 20,
	       ih->hop_limit,
	       (ntohl(*(__be32 *)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) {
			const unsigned char *p = skb_mac_header(skb);
			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) {
				const struct iphdr *iph =
					(struct iphdr *)skb_mac_header(skb);
				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;

	ip6t_log_packet(PF_INET6, hooknum, *pskb, in, out, &li,
			loginfo->prefix);
	return XT_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 xt_target ip6t_log_reg = {
	.name 		= "LOG",
	.family		= AF_INET6,
	.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)
{
	int ret;

	ret = xt_register_target(&ip6t_log_reg);
	if (ret < 0)
		return ret;
	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(&ip6t_logger);
	xt_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>
6709dbbb	24	#include <linux/netfilter/x_tables.h>
1da177e4 LT	25	#include <linux/netfilter_ipv6/ip6_tables.h>
	26
	27	MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
	28	MODULE_DESCRIPTION("IP6 tables LOG target module");
	29	MODULE_LICENSE("GPL");
	30
1da177e4 LT	31	struct in_device;
	32	#include <net/route.h>
	33	#include <linux/netfilter_ipv6/ip6t_LOG.h>
	34
	35	#if 0
	36	#define DEBUGP printk
	37	#else
	38	#define DEBUGP(format, args...)
	39	#endif
	40
	41	/* Use lock to serialize, so printks don't overlap */
	42	static DEFINE_SPINLOCK(log_lock);
	43
	44	/* One level of recursion won't kill us */
608c8e4f	45	static void dump_packet(const struct nf_loginfo *info,
1da177e4 LT	46	const struct sk_buff *skb, unsigned int ip6hoff,
	47	int recurse)
	48	{
	49	u_int8_t currenthdr;
	50	int fragment;
	51	struct ipv6hdr _ip6h, *ih;
	52	unsigned int ptr;
	53	unsigned int hdrlen = 0;
608c8e4f HW	54	unsigned int logflags;
	55
	56	if (info->type == NF_LOG_TYPE_LOG)
	57	logflags = info->u.log.logflags;
	58	else
	59	logflags = NF_LOG_MASK;
1da177e4 LT	60
	61	ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
	62	if (ih == NULL) {
	63	printk("TRUNCATED");
	64	return;
	65	}
	66
46b86a2d JP	67	/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
46b86a2d JP	68	printk("SRC=" NIP6_FMT " DST=" NIP6_FMT " ", NIP6(ih->saddr), NIP6(ih->daddr));
1da177e4 LT	69
	70	/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
	71	printk("LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
	72	ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
e69a4adc	73	(ntohl((__be32 )ih) & 0x0ff00000) >> 20,
1da177e4	74	ih->hop_limit,
e69a4adc	75	(ntohl((__be32 )ih) & 0x000fffff));
1da177e4 LT	76
	77	fragment = 0;
	78	ptr = ip6hoff + sizeof(struct ipv6hdr);
	79	currenthdr = ih->nexthdr;
	80	while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) {
	81	struct ipv6_opt_hdr _hdr, *hp;
	82
	83	hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
	84	if (hp == NULL) {
	85	printk("TRUNCATED");
	86	return;
	87	}
	88
	89	/* Max length: 48 "OPT (...) " */
608c8e4f	90	if (logflags & IP6T_LOG_IPOPT)
1da177e4 LT	91	printk("OPT ( ");
	92
	93	switch (currenthdr) {
	94	case IPPROTO_FRAGMENT: {
	95	struct frag_hdr _fhdr, *fh;
	96
	97	printk("FRAG:");
	98	fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
	99	&_fhdr);
	100	if (fh == NULL) {
	101	printk("TRUNCATED ");
	102	return;
	103	}
	104
	105	/* Max length: 6 "65535 " */
	106	printk("%u ", ntohs(fh->frag_off) & 0xFFF8);
	107
	108	/* Max length: 11 "INCOMPLETE " */
	109	if (fh->frag_off & htons(0x0001))
	110	printk("INCOMPLETE ");
	111
	112	printk("ID:%08x ", ntohl(fh->identification));
	113
	114	if (ntohs(fh->frag_off) & 0xFFF8)
	115	fragment = 1;
	116
	117	hdrlen = 8;
	118
	119	break;
	120	}
	121	case IPPROTO_DSTOPTS:
	122	case IPPROTO_ROUTING:
	123	case IPPROTO_HOPOPTS:
	124	if (fragment) {
608c8e4f	125	if (logflags & IP6T_LOG_IPOPT)
1da177e4 LT	126	printk(")");
	127	return;
	128	}
	129	hdrlen = ipv6_optlen(hp);
	130	break;
	131	/* Max Length */
	132	case IPPROTO_AH:
608c8e4f	133	if (logflags & IP6T_LOG_IPOPT) {
1da177e4 LT	134	struct ip_auth_hdr _ahdr, *ah;
	135
	136	/* Max length: 3 "AH " */
	137	printk("AH ");
	138
	139	if (fragment) {
	140	printk(")");
	141	return;
	142	}
	143
	144	ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
	145	&_ahdr);
	146	if (ah == NULL) {
	147	/*
1ab1457c	148	* Max length: 26 "INCOMPLETE [65535
1da177e4 LT	149	* bytes] )"
	150	*/
	151	printk("INCOMPLETE [%u bytes] )",
	152	skb->len - ptr);
	153	return;
	154	}
	155
	156	/* Length: 15 "SPI=0xF1234567 */
	157	printk("SPI=0x%x ", ntohl(ah->spi));
	158
	159	}
	160
	161	hdrlen = (hp->hdrlen+2)<<2;
	162	break;
	163	case IPPROTO_ESP:
608c8e4f	164	if (logflags & IP6T_LOG_IPOPT) {
1da177e4 LT	165	struct ip_esp_hdr _esph, *eh;
	166
	167	/* Max length: 4 "ESP " */
	168	printk("ESP ");
	169
	170	if (fragment) {
	171	printk(")");
	172	return;
	173	}
	174
	175	/*
	176	* Max length: 26 "INCOMPLETE [65535 bytes] )"
	177	*/
	178	eh = skb_header_pointer(skb, ptr, sizeof(_esph),
	179	&_esph);
	180	if (eh == NULL) {
	181	printk("INCOMPLETE [%u bytes] )",
	182	skb->len - ptr);
	183	return;
	184	}
	185
	186	/* Length: 16 "SPI=0xF1234567 )" */
	187	printk("SPI=0x%x )", ntohl(eh->spi) );
	188
	189	}
	190	return;
	191	default:
	192	/* Max length: 20 "Unknown Ext Hdr 255" */
	193	printk("Unknown Ext Hdr %u", currenthdr);
	194	return;
	195	}
608c8e4f	196	if (logflags & IP6T_LOG_IPOPT)
1da177e4 LT	197	printk(") ");
	198
	199	currenthdr = hp->nexthdr;
	200	ptr += hdrlen;
	201	}
	202
	203	switch (currenthdr) {
	204	case IPPROTO_TCP: {
	205	struct tcphdr _tcph, *th;
	206
	207	/* Max length: 10 "PROTO=TCP " */
	208	printk("PROTO=TCP ");
	209
	210	if (fragment)
	211	break;
	212
	213	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	214	th = skb_header_pointer(skb, ptr, sizeof(_tcph), &_tcph);
	215	if (th == NULL) {
	216	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
	217	return;
	218	}
	219
	220	/* Max length: 20 "SPT=65535 DPT=65535 " */
	221	printk("SPT=%u DPT=%u ",
	222	ntohs(th->source), ntohs(th->dest));
	223	/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
608c8e4f	224	if (logflags & IP6T_LOG_TCPSEQ)
1da177e4 LT	225	printk("SEQ=%u ACK=%u ",
	226	ntohl(th->seq), ntohl(th->ack_seq));
	227	/* Max length: 13 "WINDOW=65535 " */
	228	printk("WINDOW=%u ", ntohs(th->window));
	229	/* Max length: 9 "RES=0x3C " */
	230	printk("RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22));
	231	/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
	232	if (th->cwr)
	233	printk("CWR ");
	234	if (th->ece)
	235	printk("ECE ");
	236	if (th->urg)
	237	printk("URG ");
	238	if (th->ack)
	239	printk("ACK ");
	240	if (th->psh)
	241	printk("PSH ");
	242	if (th->rst)
	243	printk("RST ");
	244	if (th->syn)
	245	printk("SYN ");
	246	if (th->fin)
	247	printk("FIN ");
	248	/* Max length: 11 "URGP=65535 " */
	249	printk("URGP=%u ", ntohs(th->urg_ptr));
	250
608c8e4f	251	if ((logflags & IP6T_LOG_TCPOPT)
1da177e4 LT	252	&& th->doff * 4 > sizeof(struct tcphdr)) {
	253	u_int8_t _opt[60 - sizeof(struct tcphdr)], *op;
	254	unsigned int i;
	255	unsigned int optsize = th->doff * 4
	256	- sizeof(struct tcphdr);
	257
	258	op = skb_header_pointer(skb,
	259	ptr + sizeof(struct tcphdr),
	260	optsize, _opt);
	261	if (op == NULL) {
	262	printk("OPT (TRUNCATED)");
	263	return;
	264	}
	265
	266	/* Max length: 127 "OPT (" 1542chars ") " */
	267	printk("OPT (");
	268	for (i =0; i < optsize; i++)
	269	printk("%02X", op[i]);
	270	printk(") ");
	271	}
	272	break;
	273	}
ba4e58ec GR	274	case IPPROTO_UDP:
ba4e58ec GR	275	case IPPROTO_UDPLITE: {
1da177e4 LT	276	struct udphdr _udph, *uh;
1da177e4 LT	277
ba4e58ec GR	278	if (currenthdr == IPPROTO_UDP)
	279	/* Max length: 10 "PROTO=UDP " */
	280	printk("PROTO=UDP " );
	281	else /* Max length: 14 "PROTO=UDPLITE " */
	282	printk("PROTO=UDPLITE ");
1da177e4 LT	283
	284	if (fragment)
	285	break;
	286
	287	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	288	uh = skb_header_pointer(skb, ptr, sizeof(_udph), &_udph);
	289	if (uh == NULL) {
	290	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
	291	return;
	292	}
	293
	294	/* Max length: 20 "SPT=65535 DPT=65535 " */
	295	printk("SPT=%u DPT=%u LEN=%u ",
	296	ntohs(uh->source), ntohs(uh->dest),
	297	ntohs(uh->len));
	298	break;
	299	}
	300	case IPPROTO_ICMPV6: {
	301	struct icmp6hdr _icmp6h, *ic;
	302
	303	/* Max length: 13 "PROTO=ICMPv6 " */
	304	printk("PROTO=ICMPv6 ");
	305
	306	if (fragment)
	307	break;
	308
	309	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	310	ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
	311	if (ic == NULL) {
	312	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
	313	return;
	314	}
	315
	316	/* Max length: 18 "TYPE=255 CODE=255 " */
	317	printk("TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);
	318
	319	switch (ic->icmp6_type) {
	320	case ICMPV6_ECHO_REQUEST:
	321	case ICMPV6_ECHO_REPLY:
	322	/* Max length: 19 "ID=65535 SEQ=65535 " */
	323	printk("ID=%u SEQ=%u ",
	324	ntohs(ic->icmp6_identifier),
	325	ntohs(ic->icmp6_sequence));
	326	break;
	327	case ICMPV6_MGM_QUERY:
	328	case ICMPV6_MGM_REPORT:
	329	case ICMPV6_MGM_REDUCTION:
	330	break;
	331
	332	case ICMPV6_PARAMPROB:
	333	/* Max length: 17 "POINTER=ffffffff " */
	334	printk("POINTER=%08x ", ntohl(ic->icmp6_pointer));
	335	/* Fall through */
	336	case ICMPV6_DEST_UNREACH:
	337	case ICMPV6_PKT_TOOBIG:
	338	case ICMPV6_TIME_EXCEED:
	339	/* Max length: 3+maxlen */
	340	if (recurse) {
	341	printk("[");
	342	dump_packet(info, skb, ptr + sizeof(_icmp6h),
	343	0);
	344	printk("] ");
	345	}
	346
347	/* Max length: 10 "MTU=65535 " */
348	if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
349	printk("MTU=%u ", ntohl(ic->icmp6_mtu));
350	}
351	break;
352	}
353	/* Max length: 10 "PROTO=255 " */
354	default:
355	printk("PROTO=%u ", currenthdr);
356	}
357
358	/* Max length: 15 "UID=4294967295 " */
608c8e4f	359	if ((logflags & IP6T_LOG_UID) && recurse && skb->sk) {
1da177e4 LT	360	read_lock_bh(&skb->sk->sk_callback_lock);
	361	if (skb->sk->sk_socket && skb->sk->sk_socket->file)
	362	printk("UID=%u ", skb->sk->sk_socket->file->f_uid);
	363	read_unlock_bh(&skb->sk->sk_callback_lock);
	364	}
	365	}
	366
608c8e4f HW	367	static struct nf_loginfo default_loginfo = {
	368	.type = NF_LOG_TYPE_LOG,
	369	.u = {
	370	.log = {
	371	.level = 0,
	372	.logflags = NF_LOG_MASK,
	373	},
	374	},
	375	};
	376
1da177e4	377	static void
608c8e4f HW	378	ip6t_log_packet(unsigned int pf,
608c8e4f HW	379	unsigned int hooknum,
1da177e4 LT	380	const struct sk_buff *skb,
	381	const struct net_device *in,
	382	const struct net_device *out,
608c8e4f	383	const struct nf_loginfo *loginfo,
1da177e4 LT	384	const char *prefix)
1da177e4 LT	385	{
608c8e4f HW	386	if (!loginfo)
	387	loginfo = &default_loginfo;
	388
1da177e4	389	spin_lock_bh(&log_lock);
1ab1457c	390	printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
608c8e4f	391	prefix,
1da177e4 LT	392	in ? in->name : "",
	393	out ? out->name : "");
	394	if (in && !out) {
d3984a6b	395	unsigned int len;
1da177e4 LT	396	/* MAC logging for input chain only. */
1da177e4 LT	397	printk("MAC=");
d3984a6b	398	if (skb->dev && (len = skb->dev->hard_header_len) &&
047601bf	399	skb->mac.raw != skb->nh.raw) {
98e399f8	400	const unsigned char *p = skb_mac_header(skb);
047601bf PM	401	int i;
	402
	403	if (skb->dev->type == ARPHRD_SIT &&
	404	(p -= ETH_HLEN) < skb->head)
	405	p = NULL;
	406
d3984a6b PM	407	if (p != NULL) {
	408	for (i = 0; i < len; i++)
	409	printk("%02x%s", p[i],
	410	i == len - 1 ? "" : ":");
	411	}
047601bf PM	412	printk(" ");
	413
	414	if (skb->dev->type == ARPHRD_SIT) {
98e399f8 ACM	415	const struct iphdr *iph =
98e399f8 ACM	416	(struct iphdr *)skb_mac_header(skb);
047601bf PM	417	printk("TUNNEL=%u.%u.%u.%u->%u.%u.%u.%u ",
	418	NIPQUAD(iph->saddr),
	419	NIPQUAD(iph->daddr));
1da177e4 LT	420	}
	421	} else
	422	printk(" ");
	423	}
	424
	425	dump_packet(loginfo, skb, (u8*)skb->nh.ipv6h - skb->data, 1);
	426	printk("\n");
	427	spin_unlock_bh(&log_lock);
	428	}
	429
	430	static unsigned int
	431	ip6t_log_target(struct sk_buff **pskb,
	432	const struct net_device *in,
	433	const struct net_device *out,
	434	unsigned int hooknum,
c4986734	435	const struct xt_target *target,
fe1cb108	436	const void *targinfo)
1da177e4 LT	437	{
1da177e4 LT	438	const struct ip6t_log_info *loginfo = targinfo;
608c8e4f HW	439	struct nf_loginfo li;
	440
	441	li.type = NF_LOG_TYPE_LOG;
	442	li.u.log.level = loginfo->level;
	443	li.u.log.logflags = loginfo->logflags;
1da177e4	444
baf7b1e1	445	ip6t_log_packet(PF_INET6, hooknum, *pskb, in, out, &li,
1ab1457c	446	loginfo->prefix);
6709dbbb	447	return XT_CONTINUE;
1da177e4 LT	448	}
1da177e4 LT	449
1da177e4 LT	450
1da177e4 LT	451	static int ip6t_log_checkentry(const char *tablename,
2e4e6a17	452	const void *entry,
c4986734	453	const struct xt_target *target,
1da177e4	454	void *targinfo,
1da177e4 LT	455	unsigned int hook_mask)
	456	{
	457	const struct ip6t_log_info *loginfo = targinfo;
	458
1da177e4 LT	459	if (loginfo->level >= 8) {
	460	DEBUGP("LOG: level %u >= 8\n", loginfo->level);
	461	return 0;
	462	}
1da177e4 LT	463	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
	464	DEBUGP("LOG: prefix term %i\n",
	465	loginfo->prefix[sizeof(loginfo->prefix)-1]);
	466	return 0;
	467	}
1da177e4 LT	468	return 1;
	469	}
	470
6709dbbb	471	static struct xt_target ip6t_log_reg = {
1da177e4	472	.name = "LOG",
6709dbbb	473	.family = AF_INET6,
1ab1457c	474	.target = ip6t_log_target,
7f939713	475	.targetsize = sizeof(struct ip6t_log_info),
1ab1457c	476	.checkentry = ip6t_log_checkentry,
1da177e4 LT	477	.me = THIS_MODULE,
	478	};
	479
608c8e4f HW	480	static struct nf_logger ip6t_logger = {
	481	.name = "ip6t_LOG",
	482	.logfn = &ip6t_log_packet,
	483	.me = THIS_MODULE,
	484	};
	485
65b4b4e8	486	static int __init ip6t_log_init(void)
1da177e4	487	{
e1fd0586 JE	488	int ret;
e1fd0586 JE	489
6709dbbb	490	ret = xt_register_target(&ip6t_log_reg);
e1fd0586 JE	491	if (ret < 0)
e1fd0586 JE	492	return ret;
608c8e4f HW	493	if (nf_log_register(PF_INET6, &ip6t_logger) < 0) {
	494	printk(KERN_WARNING "ip6t_LOG: not logging via system console "
	495	"since somebody else already registered for PF_INET6\n");
	496	/* we cannot make module load fail here, since otherwise
	497	* ip6tables userspace would abort */
	498	}
1da177e4 LT	499
	500	return 0;
	501	}
	502
65b4b4e8	503	static void __exit ip6t_log_fini(void)
1da177e4	504	{
e92ad99c	505	nf_log_unregister(&ip6t_logger);
6709dbbb	506	xt_unregister_target(&ip6t_log_reg);
1da177e4 LT	507	}
1da177e4 LT	508
65b4b4e8 AM	509	module_init(ip6t_log_init);
65b4b4e8 AM	510	module_exit(ip6t_log_fini);