[mirror_ubuntu-hirsute-kernel.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=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(ih->saddr));
	printk("DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", 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: {
		struct udphdr _udph, *uh;

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

		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 void *targinfo,
		void *userinfo)
{
	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;

	nf_log_packet(PF_INET6, hooknum, *pskb, in, out, &li, loginfo->prefix);

	return IP6T_CONTINUE;
}


static int ip6t_log_checkentry(const char *tablename,
			       const struct ip6t_entry *e,
			       void *targinfo,
			       unsigned int targinfosize,
			       unsigned int hook_mask)
{
	const struct ip6t_log_info *loginfo = targinfo;

	if (targinfosize != IP6T_ALIGN(sizeof(struct ip6t_log_info))) {
		DEBUGP("LOG: targinfosize %u != %u\n",
		       targinfosize, IP6T_ALIGN(sizeof(struct ip6t_log_info)));
		return 0;
	}

	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, 
	.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 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 fini(void)
{
	nf_log_unregister_logger(&ip6t_logger);
	ip6t_unregister_target(&ip6t_log_reg);
}

module_init(init);
module_exit(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
	66	/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000" */
	67	printk("SRC=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(ih->saddr));
	68	printk("DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(ih->daddr));
	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),
	73	(ntohl((u_int32_t )ih) & 0x0ff00000) >> 20,
	74	ih->hop_limit,
	75	(ntohl((u_int32_t )ih) & 0x000fffff));
	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	/*
	148	* Max length: 26 "INCOMPLETE [65535
	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	}
	274	case IPPROTO_UDP: {
	275	struct udphdr _udph, *uh;
	276
	277	/* Max length: 10 "PROTO=UDP " */
	278	printk("PROTO=UDP ");
	279
	280	if (fragment)
	281	break;
	282
	283	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	284	uh = skb_header_pointer(skb, ptr, sizeof(_udph), &_udph);
	285	if (uh == NULL) {
	286	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
	287	return;
	288	}
	289
	290	/* Max length: 20 "SPT=65535 DPT=65535 " */
	291	printk("SPT=%u DPT=%u LEN=%u ",
	292	ntohs(uh->source), ntohs(uh->dest),
	293	ntohs(uh->len));
	294	break;
	295	}
	296	case IPPROTO_ICMPV6: {
	297	struct icmp6hdr _icmp6h, *ic;
	298
	299	/* Max length: 13 "PROTO=ICMPv6 " */
	300	printk("PROTO=ICMPv6 ");
	301
	302	if (fragment)
	303	break;
	304
	305	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	306	ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
	307	if (ic == NULL) {
	308	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
	309	return;
	310	}
	311
	312	/* Max length: 18 "TYPE=255 CODE=255 " */
	313	printk("TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);
	314
	315	switch (ic->icmp6_type) {
316	case ICMPV6_ECHO_REQUEST:
317	case ICMPV6_ECHO_REPLY:
318	/* Max length: 19 "ID=65535 SEQ=65535 " */
319	printk("ID=%u SEQ=%u ",
320	ntohs(ic->icmp6_identifier),
321	ntohs(ic->icmp6_sequence));
322	break;
323	case ICMPV6_MGM_QUERY:
324	case ICMPV6_MGM_REPORT:
325	case ICMPV6_MGM_REDUCTION:
326	break;
327
328	case ICMPV6_PARAMPROB:
329	/* Max length: 17 "POINTER=ffffffff " */
330	printk("POINTER=%08x ", ntohl(ic->icmp6_pointer));
331	/* Fall through */
332	case ICMPV6_DEST_UNREACH:
333	case ICMPV6_PKT_TOOBIG:
334	case ICMPV6_TIME_EXCEED:
335	/* Max length: 3+maxlen */
336	if (recurse) {
337	printk("[");
338	dump_packet(info, skb, ptr + sizeof(_icmp6h),
339	0);
340	printk("] ");
341	}
342
343	/* Max length: 10 "MTU=65535 " */
344	if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
345	printk("MTU=%u ", ntohl(ic->icmp6_mtu));
346	}
347	break;
348	}
349	/* Max length: 10 "PROTO=255 " */
350	default:
351	printk("PROTO=%u ", currenthdr);
352	}
353
354	/* Max length: 15 "UID=4294967295 " */
608c8e4f	355	if ((logflags & IP6T_LOG_UID) && recurse && skb->sk) {
1da177e4 LT	356	read_lock_bh(&skb->sk->sk_callback_lock);
	357	if (skb->sk->sk_socket && skb->sk->sk_socket->file)
	358	printk("UID=%u ", skb->sk->sk_socket->file->f_uid);
	359	read_unlock_bh(&skb->sk->sk_callback_lock);
	360	}
	361	}
	362
608c8e4f HW	363	static struct nf_loginfo default_loginfo = {
	364	.type = NF_LOG_TYPE_LOG,
	365	.u = {
	366	.log = {
	367	.level = 0,
	368	.logflags = NF_LOG_MASK,
	369	},
	370	},
	371	};
	372
1da177e4	373	static void
608c8e4f HW	374	ip6t_log_packet(unsigned int pf,
608c8e4f HW	375	unsigned int hooknum,
1da177e4 LT	376	const struct sk_buff *skb,
	377	const struct net_device *in,
	378	const struct net_device *out,
608c8e4f	379	const struct nf_loginfo *loginfo,
1da177e4 LT	380	const char *prefix)
1da177e4 LT	381	{
608c8e4f HW	382	if (!loginfo)
	383	loginfo = &default_loginfo;
	384
1da177e4	385	spin_lock_bh(&log_lock);
608c8e4f HW	386	printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
608c8e4f HW	387	prefix,
1da177e4 LT	388	in ? in->name : "",
	389	out ? out->name : "");
	390	if (in && !out) {
d3984a6b	391	unsigned int len;
1da177e4 LT	392	/* MAC logging for input chain only. */
1da177e4 LT	393	printk("MAC=");
d3984a6b	394	if (skb->dev && (len = skb->dev->hard_header_len) &&
047601bf PM	395	skb->mac.raw != skb->nh.raw) {
	396	unsigned char *p = skb->mac.raw;
	397	int i;
	398
	399	if (skb->dev->type == ARPHRD_SIT &&
	400	(p -= ETH_HLEN) < skb->head)
	401	p = NULL;
	402
d3984a6b PM	403	if (p != NULL) {
	404	for (i = 0; i < len; i++)
	405	printk("%02x%s", p[i],
	406	i == len - 1 ? "" : ":");
	407	}
047601bf PM	408	printk(" ");
	409
	410	if (skb->dev->type == ARPHRD_SIT) {
	411	struct iphdr iph = (struct iphdr )skb->mac.raw;
	412	printk("TUNNEL=%u.%u.%u.%u->%u.%u.%u.%u ",
	413	NIPQUAD(iph->saddr),
	414	NIPQUAD(iph->daddr));
1da177e4 LT	415	}
	416	} else
	417	printk(" ");
	418	}
	419
	420	dump_packet(loginfo, skb, (u8*)skb->nh.ipv6h - skb->data, 1);
	421	printk("\n");
	422	spin_unlock_bh(&log_lock);
	423	}
	424
	425	static unsigned int
	426	ip6t_log_target(struct sk_buff **pskb,
	427	const struct net_device *in,
	428	const struct net_device *out,
	429	unsigned int hooknum,
	430	const void *targinfo,
	431	void *userinfo)
	432	{
	433	const struct ip6t_log_info *loginfo = targinfo;
608c8e4f HW	434	struct nf_loginfo li;
	435
	436	li.type = NF_LOG_TYPE_LOG;
	437	li.u.log.level = loginfo->level;
	438	li.u.log.logflags = loginfo->logflags;
1da177e4	439
608c8e4f	440	nf_log_packet(PF_INET6, hooknum, *pskb, in, out, &li, loginfo->prefix);
1da177e4 LT	441
	442	return IP6T_CONTINUE;
	443	}
	444
1da177e4 LT	445
	446	static int ip6t_log_checkentry(const char *tablename,
	447	const struct ip6t_entry *e,
	448	void *targinfo,
	449	unsigned int targinfosize,
	450	unsigned int hook_mask)
	451	{
	452	const struct ip6t_log_info *loginfo = targinfo;
	453
	454	if (targinfosize != IP6T_ALIGN(sizeof(struct ip6t_log_info))) {
	455	DEBUGP("LOG: targinfosize %u != %u\n",
	456	targinfosize, IP6T_ALIGN(sizeof(struct ip6t_log_info)));
	457	return 0;
	458	}
	459
	460	if (loginfo->level >= 8) {
	461	DEBUGP("LOG: level %u >= 8\n", loginfo->level);
	462	return 0;
	463	}
	464
	465	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
	466	DEBUGP("LOG: prefix term %i\n",
	467	loginfo->prefix[sizeof(loginfo->prefix)-1]);
	468	return 0;
	469	}
	470
	471	return 1;
	472	}
	473
	474	static struct ip6t_target ip6t_log_reg = {
	475	.name = "LOG",
	476	.target = ip6t_log_target,
	477	.checkentry = ip6t_log_checkentry,
	478	.me = THIS_MODULE,
	479	};
	480
608c8e4f HW	481	static struct nf_logger ip6t_logger = {
	482	.name = "ip6t_LOG",
	483	.logfn = &ip6t_log_packet,
	484	.me = THIS_MODULE,
	485	};
	486
1da177e4 LT	487	static int __init init(void)
	488	{
	489	if (ip6t_register_target(&ip6t_log_reg))
	490	return -EINVAL;
608c8e4f HW	491	if (nf_log_register(PF_INET6, &ip6t_logger) < 0) {
	492	printk(KERN_WARNING "ip6t_LOG: not logging via system console "
	493	"since somebody else already registered for PF_INET6\n");
	494	/* we cannot make module load fail here, since otherwise
	495	* ip6tables userspace would abort */
	496	}
1da177e4 LT	497
	498	return 0;
	499	}
	500
	501	static void __exit fini(void)
	502	{
608c8e4f	503	nf_log_unregister_logger(&ip6t_logger);
1da177e4 LT	504	ip6t_unregister_target(&ip6t_log_reg);
	505	}
	506
	507	module_init(init);
	508	module_exit(fini);