[deliverable/linux.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;
	const struct ipv6hdr *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;
		const struct ipv6_opt_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;
			const struct frag_hdr *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;
				const struct ip_auth_hdr *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;
				const struct ip_esp_hdr *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;
		const struct tcphdr *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)];
			const u_int8_t *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;
		const struct udphdr *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;
		const struct icmp6hdr *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_header != skb->network_header) {
			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, skb_network_offset(skb), 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 bool 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 false;
	}
	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
		DEBUGP("LOG: prefix term %i\n",
		       loginfo->prefix[sizeof(loginfo->prefix)-1]);
		return false;
	}
	return true;
}

static struct xt_target ip6t_log_reg __read_mostly = {
	.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;
	ret = nf_log_register(PF_INET6, &ip6t_logger);
	if (ret < 0 && ret != -EEXIST)
		xt_unregister_target(&ip6t_log_reg);
	return ret;
}

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;
a47362a2 JE	51	struct ipv6hdr _ip6h;
a47362a2 JE	52	const struct ipv6hdr *ih;
1da177e4 LT	53	unsigned int ptr;
1da177e4 LT	54	unsigned int hdrlen = 0;
608c8e4f HW	55	unsigned int logflags;
	56
	57	if (info->type == NF_LOG_TYPE_LOG)
	58	logflags = info->u.log.logflags;
	59	else
	60	logflags = NF_LOG_MASK;
1da177e4 LT	61
	62	ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
	63	if (ih == NULL) {
	64	printk("TRUNCATED");
	65	return;
	66	}
	67
46b86a2d JP	68	/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
46b86a2d JP	69	printk("SRC=" NIP6_FMT " DST=" NIP6_FMT " ", NIP6(ih->saddr), NIP6(ih->daddr));
1da177e4 LT	70
	71	/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
	72	printk("LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
	73	ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
e69a4adc	74	(ntohl((__be32 )ih) & 0x0ff00000) >> 20,
1da177e4	75	ih->hop_limit,
e69a4adc	76	(ntohl((__be32 )ih) & 0x000fffff));
1da177e4 LT	77
	78	fragment = 0;
	79	ptr = ip6hoff + sizeof(struct ipv6hdr);
	80	currenthdr = ih->nexthdr;
	81	while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) {
a47362a2 JE	82	struct ipv6_opt_hdr _hdr;
a47362a2 JE	83	const struct ipv6_opt_hdr *hp;
1da177e4 LT	84
	85	hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
	86	if (hp == NULL) {
	87	printk("TRUNCATED");
	88	return;
	89	}
	90
	91	/* Max length: 48 "OPT (...) " */
608c8e4f	92	if (logflags & IP6T_LOG_IPOPT)
1da177e4 LT	93	printk("OPT ( ");
	94
	95	switch (currenthdr) {
	96	case IPPROTO_FRAGMENT: {
a47362a2 JE	97	struct frag_hdr _fhdr;
a47362a2 JE	98	const struct frag_hdr *fh;
1da177e4 LT	99
	100	printk("FRAG:");
	101	fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
	102	&_fhdr);
	103	if (fh == NULL) {
	104	printk("TRUNCATED ");
	105	return;
	106	}
	107
	108	/* Max length: 6 "65535 " */
	109	printk("%u ", ntohs(fh->frag_off) & 0xFFF8);
	110
	111	/* Max length: 11 "INCOMPLETE " */
	112	if (fh->frag_off & htons(0x0001))
	113	printk("INCOMPLETE ");
	114
	115	printk("ID:%08x ", ntohl(fh->identification));
	116
	117	if (ntohs(fh->frag_off) & 0xFFF8)
	118	fragment = 1;
	119
	120	hdrlen = 8;
	121
	122	break;
	123	}
	124	case IPPROTO_DSTOPTS:
	125	case IPPROTO_ROUTING:
	126	case IPPROTO_HOPOPTS:
	127	if (fragment) {
608c8e4f	128	if (logflags & IP6T_LOG_IPOPT)
1da177e4 LT	129	printk(")");
	130	return;
	131	}
	132	hdrlen = ipv6_optlen(hp);
	133	break;
	134	/* Max Length */
	135	case IPPROTO_AH:
608c8e4f	136	if (logflags & IP6T_LOG_IPOPT) {
a47362a2 JE	137	struct ip_auth_hdr _ahdr;
a47362a2 JE	138	const struct ip_auth_hdr *ah;
1da177e4 LT	139
	140	/* Max length: 3 "AH " */
	141	printk("AH ");
	142
	143	if (fragment) {
	144	printk(")");
	145	return;
	146	}
	147
	148	ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
	149	&_ahdr);
	150	if (ah == NULL) {
	151	/*
1ab1457c	152	* Max length: 26 "INCOMPLETE [65535
1da177e4 LT	153	* bytes] )"
	154	*/
	155	printk("INCOMPLETE [%u bytes] )",
	156	skb->len - ptr);
	157	return;
	158	}
	159
	160	/* Length: 15 "SPI=0xF1234567 */
	161	printk("SPI=0x%x ", ntohl(ah->spi));
	162
	163	}
	164
	165	hdrlen = (hp->hdrlen+2)<<2;
	166	break;
	167	case IPPROTO_ESP:
608c8e4f	168	if (logflags & IP6T_LOG_IPOPT) {
a47362a2 JE	169	struct ip_esp_hdr _esph;
a47362a2 JE	170	const struct ip_esp_hdr *eh;
1da177e4 LT	171
	172	/* Max length: 4 "ESP " */
	173	printk("ESP ");
	174
	175	if (fragment) {
	176	printk(")");
	177	return;
	178	}
	179
	180	/*
	181	* Max length: 26 "INCOMPLETE [65535 bytes] )"
	182	*/
	183	eh = skb_header_pointer(skb, ptr, sizeof(_esph),
	184	&_esph);
	185	if (eh == NULL) {
	186	printk("INCOMPLETE [%u bytes] )",
	187	skb->len - ptr);
	188	return;
	189	}
	190
	191	/* Length: 16 "SPI=0xF1234567 )" */
	192	printk("SPI=0x%x )", ntohl(eh->spi) );
	193
	194	}
	195	return;
	196	default:
	197	/* Max length: 20 "Unknown Ext Hdr 255" */
	198	printk("Unknown Ext Hdr %u", currenthdr);
	199	return;
	200	}
608c8e4f	201	if (logflags & IP6T_LOG_IPOPT)
1da177e4 LT	202	printk(") ");
	203
	204	currenthdr = hp->nexthdr;
	205	ptr += hdrlen;
	206	}
	207
	208	switch (currenthdr) {
	209	case IPPROTO_TCP: {
a47362a2 JE	210	struct tcphdr _tcph;
a47362a2 JE	211	const struct tcphdr *th;
1da177e4 LT	212
	213	/* Max length: 10 "PROTO=TCP " */
	214	printk("PROTO=TCP ");
	215
	216	if (fragment)
	217	break;
	218
	219	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	220	th = skb_header_pointer(skb, ptr, sizeof(_tcph), &_tcph);
	221	if (th == NULL) {
	222	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
	223	return;
	224	}
	225
	226	/* Max length: 20 "SPT=65535 DPT=65535 " */
	227	printk("SPT=%u DPT=%u ",
	228	ntohs(th->source), ntohs(th->dest));
	229	/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
608c8e4f	230	if (logflags & IP6T_LOG_TCPSEQ)
1da177e4 LT	231	printk("SEQ=%u ACK=%u ",
	232	ntohl(th->seq), ntohl(th->ack_seq));
	233	/* Max length: 13 "WINDOW=65535 " */
	234	printk("WINDOW=%u ", ntohs(th->window));
	235	/* Max length: 9 "RES=0x3C " */
	236	printk("RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22));
	237	/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
	238	if (th->cwr)
	239	printk("CWR ");
	240	if (th->ece)
	241	printk("ECE ");
	242	if (th->urg)
	243	printk("URG ");
	244	if (th->ack)
	245	printk("ACK ");
	246	if (th->psh)
	247	printk("PSH ");
	248	if (th->rst)
	249	printk("RST ");
	250	if (th->syn)
	251	printk("SYN ");
	252	if (th->fin)
	253	printk("FIN ");
	254	/* Max length: 11 "URGP=65535 " */
	255	printk("URGP=%u ", ntohs(th->urg_ptr));
	256
608c8e4f	257	if ((logflags & IP6T_LOG_TCPOPT)
1da177e4	258	&& th->doff * 4 > sizeof(struct tcphdr)) {
a47362a2 JE	259	u_int8_t _opt[60 - sizeof(struct tcphdr)];
a47362a2 JE	260	const u_int8_t *op;
1da177e4 LT	261	unsigned int i;
	262	unsigned int optsize = th->doff * 4
	263	- sizeof(struct tcphdr);
	264
	265	op = skb_header_pointer(skb,
	266	ptr + sizeof(struct tcphdr),
	267	optsize, _opt);
	268	if (op == NULL) {
	269	printk("OPT (TRUNCATED)");
	270	return;
	271	}
	272
	273	/* Max length: 127 "OPT (" 1542chars ") " */
	274	printk("OPT (");
	275	for (i =0; i < optsize; i++)
	276	printk("%02X", op[i]);
	277	printk(") ");
	278	}
	279	break;
	280	}
ba4e58ec GR	281	case IPPROTO_UDP:
ba4e58ec GR	282	case IPPROTO_UDPLITE: {
a47362a2 JE	283	struct udphdr _udph;
a47362a2 JE	284	const struct udphdr *uh;
1da177e4	285
ba4e58ec GR	286	if (currenthdr == IPPROTO_UDP)
	287	/* Max length: 10 "PROTO=UDP " */
	288	printk("PROTO=UDP " );
	289	else /* Max length: 14 "PROTO=UDPLITE " */
	290	printk("PROTO=UDPLITE ");
1da177e4 LT	291
	292	if (fragment)
	293	break;
	294
	295	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	296	uh = skb_header_pointer(skb, ptr, sizeof(_udph), &_udph);
	297	if (uh == NULL) {
	298	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
	299	return;
	300	}
	301
	302	/* Max length: 20 "SPT=65535 DPT=65535 " */
	303	printk("SPT=%u DPT=%u LEN=%u ",
	304	ntohs(uh->source), ntohs(uh->dest),
	305	ntohs(uh->len));
	306	break;
	307	}
	308	case IPPROTO_ICMPV6: {
a47362a2 JE	309	struct icmp6hdr _icmp6h;
a47362a2 JE	310	const struct icmp6hdr *ic;
1da177e4 LT	311
	312	/* Max length: 13 "PROTO=ICMPv6 " */
	313	printk("PROTO=ICMPv6 ");
	314
	315	if (fragment)
	316	break;
	317
	318	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	319	ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
	320	if (ic == NULL) {
	321	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
	322	return;
	323	}
	324
	325	/* Max length: 18 "TYPE=255 CODE=255 " */
	326	printk("TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);
	327
	328	switch (ic->icmp6_type) {
	329	case ICMPV6_ECHO_REQUEST:
	330	case ICMPV6_ECHO_REPLY:
	331	/* Max length: 19 "ID=65535 SEQ=65535 " */
	332	printk("ID=%u SEQ=%u ",
	333	ntohs(ic->icmp6_identifier),
	334	ntohs(ic->icmp6_sequence));
	335	break;
	336	case ICMPV6_MGM_QUERY:
	337	case ICMPV6_MGM_REPORT:
	338	case ICMPV6_MGM_REDUCTION:
	339	break;
	340
	341	case ICMPV6_PARAMPROB:
	342	/* Max length: 17 "POINTER=ffffffff " */
	343	printk("POINTER=%08x ", ntohl(ic->icmp6_pointer));
	344	/* Fall through */
	345	case ICMPV6_DEST_UNREACH:
	346	case ICMPV6_PKT_TOOBIG:
	347	case ICMPV6_TIME_EXCEED:
	348	/* Max length: 3+maxlen */
	349	if (recurse) {
	350	printk("[");
	351	dump_packet(info, skb, ptr + sizeof(_icmp6h),
	352	0);
	353	printk("] ");
	354	}
	355
	356	/* Max length: 10 "MTU=65535 " */
	357	if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
	358	printk("MTU=%u ", ntohl(ic->icmp6_mtu));
	359	}
	360	break;
	361	}
	362	/* Max length: 10 "PROTO=255 " */
	363	default:
	364	printk("PROTO=%u ", currenthdr);
	365	}
	366
	367	/* Max length: 15 "UID=4294967295 " */
608c8e4f	368	if ((logflags & IP6T_LOG_UID) && recurse && skb->sk) {
1da177e4 LT	369	read_lock_bh(&skb->sk->sk_callback_lock);
	370	if (skb->sk->sk_socket && skb->sk->sk_socket->file)
	371	printk("UID=%u ", skb->sk->sk_socket->file->f_uid);
	372	read_unlock_bh(&skb->sk->sk_callback_lock);
	373	}
	374	}
	375
608c8e4f HW	376	static struct nf_loginfo default_loginfo = {
	377	.type = NF_LOG_TYPE_LOG,
	378	.u = {
	379	.log = {
	380	.level = 0,
	381	.logflags = NF_LOG_MASK,
	382	},
	383	},
	384	};
	385
1da177e4	386	static void
608c8e4f HW	387	ip6t_log_packet(unsigned int pf,
608c8e4f HW	388	unsigned int hooknum,
1da177e4 LT	389	const struct sk_buff *skb,
	390	const struct net_device *in,
	391	const struct net_device *out,
608c8e4f	392	const struct nf_loginfo *loginfo,
1da177e4 LT	393	const char *prefix)
1da177e4 LT	394	{
608c8e4f HW	395	if (!loginfo)
	396	loginfo = &default_loginfo;
	397
1da177e4	398	spin_lock_bh(&log_lock);
1ab1457c	399	printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
608c8e4f	400	prefix,
1da177e4 LT	401	in ? in->name : "",
	402	out ? out->name : "");
	403	if (in && !out) {
d3984a6b	404	unsigned int len;
1da177e4 LT	405	/* MAC logging for input chain only. */
1da177e4 LT	406	printk("MAC=");
d3984a6b	407	if (skb->dev && (len = skb->dev->hard_header_len) &&
b0e380b1	408	skb->mac_header != skb->network_header) {
98e399f8	409	const unsigned char *p = skb_mac_header(skb);
047601bf PM	410	int i;
	411
	412	if (skb->dev->type == ARPHRD_SIT &&
	413	(p -= ETH_HLEN) < skb->head)
	414	p = NULL;
	415
d3984a6b PM	416	if (p != NULL) {
	417	for (i = 0; i < len; i++)
	418	printk("%02x%s", p[i],
	419	i == len - 1 ? "" : ":");
	420	}
047601bf PM	421	printk(" ");
	422
	423	if (skb->dev->type == ARPHRD_SIT) {
98e399f8 ACM	424	const struct iphdr *iph =
98e399f8 ACM	425	(struct iphdr *)skb_mac_header(skb);
047601bf PM	426	printk("TUNNEL=%u.%u.%u.%u->%u.%u.%u.%u ",
	427	NIPQUAD(iph->saddr),
	428	NIPQUAD(iph->daddr));
1da177e4 LT	429	}
	430	} else
	431	printk(" ");
	432	}
	433
0660e03f	434	dump_packet(loginfo, skb, skb_network_offset(skb), 1);
1da177e4 LT	435	printk("\n");
	436	spin_unlock_bh(&log_lock);
	437	}
	438
	439	static unsigned int
	440	ip6t_log_target(struct sk_buff **pskb,
	441	const struct net_device *in,
	442	const struct net_device *out,
	443	unsigned int hooknum,
c4986734	444	const struct xt_target *target,
fe1cb108	445	const void *targinfo)
1da177e4 LT	446	{
1da177e4 LT	447	const struct ip6t_log_info *loginfo = targinfo;
608c8e4f HW	448	struct nf_loginfo li;
	449
	450	li.type = NF_LOG_TYPE_LOG;
	451	li.u.log.level = loginfo->level;
	452	li.u.log.logflags = loginfo->logflags;
1da177e4	453
baf7b1e1	454	ip6t_log_packet(PF_INET6, hooknum, *pskb, in, out, &li,
1ab1457c	455	loginfo->prefix);
6709dbbb	456	return XT_CONTINUE;
1da177e4 LT	457	}
1da177e4 LT	458
1da177e4	459
e1931b78 JE	460	static bool ip6t_log_checkentry(const char *tablename,
	461	const void *entry,
	462	const struct xt_target *target,
	463	void *targinfo,
	464	unsigned int hook_mask)
1da177e4 LT	465	{
	466	const struct ip6t_log_info *loginfo = targinfo;
	467
1da177e4 LT	468	if (loginfo->level >= 8) {
1da177e4 LT	469	DEBUGP("LOG: level %u >= 8\n", loginfo->level);
e1931b78	470	return false;
1da177e4	471	}
1da177e4 LT	472	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
	473	DEBUGP("LOG: prefix term %i\n",
	474	loginfo->prefix[sizeof(loginfo->prefix)-1]);
e1931b78	475	return false;
1da177e4	476	}
e1931b78	477	return true;
1da177e4 LT	478	}
1da177e4 LT	479
9f15c530	480	static struct xt_target ip6t_log_reg __read_mostly = {
1da177e4	481	.name = "LOG",
6709dbbb	482	.family = AF_INET6,
1ab1457c	483	.target = ip6t_log_target,
7f939713	484	.targetsize = sizeof(struct ip6t_log_info),
1ab1457c	485	.checkentry = ip6t_log_checkentry,
1da177e4 LT	486	.me = THIS_MODULE,
	487	};
	488
608c8e4f HW	489	static struct nf_logger ip6t_logger = {
	490	.name = "ip6t_LOG",
	491	.logfn = &ip6t_log_packet,
	492	.me = THIS_MODULE,
	493	};
	494
65b4b4e8	495	static int __init ip6t_log_init(void)
1da177e4	496	{
e1fd0586 JE	497	int ret;
e1fd0586 JE	498
6709dbbb	499	ret = xt_register_target(&ip6t_log_reg);
e1fd0586 JE	500	if (ret < 0)
e1fd0586 JE	501	return ret;
3b5018d6 PM	502	ret = nf_log_register(PF_INET6, &ip6t_logger);
	503	if (ret < 0 && ret != -EEXIST)
	504	xt_unregister_target(&ip6t_log_reg);
	505	return ret;
1da177e4 LT	506	}
1da177e4 LT	507
65b4b4e8	508	static void __exit ip6t_log_fini(void)
1da177e4	509	{
e92ad99c	510	nf_log_unregister(&ip6t_logger);
6709dbbb	511	xt_unregister_target(&ip6t_log_reg);
1da177e4 LT	512	}
1da177e4 LT	513
65b4b4e8 AM	514	module_init(ip6t_log_init);
65b4b4e8 AM	515	module_exit(ip6t_log_fini);