[linux.git] / net / ipv6 / netfilter / ip6t_LOG.c

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

/* (C) 2001 Jan Rekorajski <[email protected]>
 * (C) 2002-2004 Netfilter Core Team <[email protected]>
 *
 * 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.
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.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>
#include <net/netfilter/nf_log.h>

MODULE_AUTHOR("Jan Rekorajski <[email protected]>");
MODULE_DESCRIPTION("Xtables: IPv6 packet logging to syslog");
MODULE_LICENSE("GPL");

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

/* 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=%pI6 DST=%pI6 ", &ih->saddr, &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 GID=%u ",
				skb->sk->sk_socket->file->f_cred->fsuid,
				skb->sk->sk_socket->file->f_cred->fsgid);
		read_unlock_bh(&skb->sk->sk_callback_lock);
	}

	/* Max length: 16 "MARK=0xFFFFFFFF " */
	if (!recurse && skb->mark)
		printk("MARK=0x%x ", skb->mark);
}

static void dump_mac_header(const struct nf_loginfo *info,
			    const struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	unsigned int logflags = 0;

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

	if (!(logflags & IP6T_LOG_MACDECODE))
		goto fallback;

	switch (dev->type) {
	case ARPHRD_ETHER:
		printk("MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
		       eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
		       ntohs(eth_hdr(skb)->h_proto));
		return;
	default:
		break;
	}

fallback:
	printk("MAC=");
	if (dev->hard_header_len &&
	    skb->mac_header != skb->network_header) {
		const unsigned char *p = skb_mac_header(skb);
		unsigned int len = dev->hard_header_len;
		unsigned int i;

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

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

		if (dev->type == ARPHRD_SIT) {
			const struct iphdr *iph =
				(struct iphdr *)skb_mac_header(skb);
			printk("TUNNEL=%pI4->%pI4 ", &iph->saddr, &iph->daddr);
		}
	} else
		printk(" ");
}

static struct nf_loginfo default_loginfo = {
	.type	= NF_LOG_TYPE_LOG,
	.u = {
		.log = {
			.level	  = 5,
			.logflags = NF_LOG_MASK,
		},
	},
};

static void
ip6t_log_packet(u_int8_t 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 : "");

	/* MAC logging for input path only. */
	if (in && !out)
		dump_mac_header(loginfo, skb);

	dump_packet(loginfo, skb, skb_network_offset(skb), 1);
	printk("\n");
	spin_unlock_bh(&log_lock);
}

static unsigned int
log_tg6(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct ip6t_log_info *loginfo = par->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(NFPROTO_IPV6, par->hooknum, skb, par->in, par->out,
			&li, loginfo->prefix);
	return XT_CONTINUE;
}


static int log_tg6_check(const struct xt_tgchk_param *par)
{
	const struct ip6t_log_info *loginfo = par->targinfo;

	if (loginfo->level >= 8) {
		pr_debug("level %u >= 8\n", loginfo->level);
		return -EINVAL;
	}
	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
		pr_debug("prefix not null-terminated\n");
		return -EINVAL;
	}
	return 0;
}

static struct xt_target log_tg6_reg __read_mostly = {
	.name 		= "LOG",
	.family		= NFPROTO_IPV6,
	.target 	= log_tg6,
	.targetsize	= sizeof(struct ip6t_log_info),
	.checkentry	= log_tg6_check,
	.me 		= THIS_MODULE,
};

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

static int __init log_tg6_init(void)
{
	int ret;

	ret = xt_register_target(&log_tg6_reg);
	if (ret < 0)
		return ret;
	nf_log_register(NFPROTO_IPV6, &ip6t_logger);
	return 0;
}

static void __exit log_tg6_exit(void)
{
	nf_log_unregister(&ip6t_logger);
	xt_unregister_target(&log_tg6_reg);
}

module_init(log_tg6_init);
module_exit(log_tg6_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This is a module which is used for logging packets.
	3	*/
	4
	5	/* (C) 2001 Jan Rekorajski <[email protected]>
	6	* (C) 2002-2004 Netfilter Core Team <[email protected]>
	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	*/
ff67e4e4	12	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
1da177e4	13	#include <linux/module.h>
1da177e4	14	#include <linux/skbuff.h>
14c85021	15	#include <linux/if_arp.h>
1da177e4 LT	16	#include <linux/ip.h>
	17	#include <linux/spinlock.h>
	18	#include <linux/icmpv6.h>
	19	#include <net/udp.h>
	20	#include <net/tcp.h>
	21	#include <net/ipv6.h>
	22	#include <linux/netfilter.h>
6709dbbb	23	#include <linux/netfilter/x_tables.h>
1da177e4	24	#include <linux/netfilter_ipv6/ip6_tables.h>
f01ffbd6	25	#include <net/netfilter/nf_log.h>
1da177e4 LT	26
1da177e4 LT	27	MODULE_AUTHOR("Jan Rekorajski <[email protected]>");
2ae15b64	28	MODULE_DESCRIPTION("Xtables: IPv6 packet logging to syslog");
1da177e4 LT	29	MODULE_LICENSE("GPL");
1da177e4 LT	30
1da177e4 LT	31	struct in_device;
	32	#include <net/route.h>
	33	#include <linux/netfilter_ipv6/ip6t_LOG.h>
	34
1da177e4 LT	35	/* Use lock to serialize, so printks don't overlap */
	36	static DEFINE_SPINLOCK(log_lock);
	37
	38	/* One level of recursion won't kill us */
608c8e4f	39	static void dump_packet(const struct nf_loginfo *info,
1da177e4 LT	40	const struct sk_buff *skb, unsigned int ip6hoff,
	41	int recurse)
	42	{
	43	u_int8_t currenthdr;
	44	int fragment;
a47362a2 JE	45	struct ipv6hdr _ip6h;
a47362a2 JE	46	const struct ipv6hdr *ih;
1da177e4 LT	47	unsigned int ptr;
1da177e4 LT	48	unsigned int hdrlen = 0;
608c8e4f HW	49	unsigned int logflags;
	50
	51	if (info->type == NF_LOG_TYPE_LOG)
	52	logflags = info->u.log.logflags;
	53	else
	54	logflags = NF_LOG_MASK;
1da177e4 LT	55
	56	ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
	57	if (ih == NULL) {
	58	printk("TRUNCATED");
	59	return;
	60	}
	61
46b86a2d	62	/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
5b095d98	63	printk("SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
1da177e4 LT	64
	65	/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
	66	printk("LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
	67	ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
e69a4adc	68	(ntohl((__be32 )ih) & 0x0ff00000) >> 20,
1da177e4	69	ih->hop_limit,
e69a4adc	70	(ntohl((__be32 )ih) & 0x000fffff));
1da177e4 LT	71
	72	fragment = 0;
	73	ptr = ip6hoff + sizeof(struct ipv6hdr);
	74	currenthdr = ih->nexthdr;
	75	while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) {
a47362a2 JE	76	struct ipv6_opt_hdr _hdr;
a47362a2 JE	77	const struct ipv6_opt_hdr *hp;
1da177e4 LT	78
	79	hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
	80	if (hp == NULL) {
	81	printk("TRUNCATED");
	82	return;
	83	}
	84
	85	/* Max length: 48 "OPT (...) " */
608c8e4f	86	if (logflags & IP6T_LOG_IPOPT)
1da177e4 LT	87	printk("OPT ( ");
	88
	89	switch (currenthdr) {
	90	case IPPROTO_FRAGMENT: {
a47362a2 JE	91	struct frag_hdr _fhdr;
a47362a2 JE	92	const struct frag_hdr *fh;
1da177e4 LT	93
	94	printk("FRAG:");
	95	fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
	96	&_fhdr);
	97	if (fh == NULL) {
	98	printk("TRUNCATED ");
	99	return;
	100	}
	101
	102	/* Max length: 6 "65535 " */
	103	printk("%u ", ntohs(fh->frag_off) & 0xFFF8);
	104
	105	/* Max length: 11 "INCOMPLETE " */
	106	if (fh->frag_off & htons(0x0001))
	107	printk("INCOMPLETE ");
	108
	109	printk("ID:%08x ", ntohl(fh->identification));
	110
	111	if (ntohs(fh->frag_off) & 0xFFF8)
	112	fragment = 1;
	113
	114	hdrlen = 8;
	115
	116	break;
	117	}
	118	case IPPROTO_DSTOPTS:
	119	case IPPROTO_ROUTING:
	120	case IPPROTO_HOPOPTS:
	121	if (fragment) {
608c8e4f	122	if (logflags & IP6T_LOG_IPOPT)
1da177e4 LT	123	printk(")");
	124	return;
	125	}
	126	hdrlen = ipv6_optlen(hp);
	127	break;
	128	/* Max Length */
	129	case IPPROTO_AH:
608c8e4f	130	if (logflags & IP6T_LOG_IPOPT) {
a47362a2 JE	131	struct ip_auth_hdr _ahdr;
a47362a2 JE	132	const struct ip_auth_hdr *ah;
1da177e4 LT	133
	134	/* Max length: 3 "AH " */
	135	printk("AH ");
	136
	137	if (fragment) {
	138	printk(")");
	139	return;
	140	}
	141
	142	ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
	143	&_ahdr);
	144	if (ah == NULL) {
	145	/*
1ab1457c	146	* Max length: 26 "INCOMPLETE [65535
1da177e4 LT	147	* bytes] )"
	148	*/
	149	printk("INCOMPLETE [%u bytes] )",
	150	skb->len - ptr);
	151	return;
	152	}
	153
	154	/* Length: 15 "SPI=0xF1234567 */
	155	printk("SPI=0x%x ", ntohl(ah->spi));
	156
	157	}
	158
	159	hdrlen = (hp->hdrlen+2)<<2;
	160	break;
	161	case IPPROTO_ESP:
608c8e4f	162	if (logflags & IP6T_LOG_IPOPT) {
a47362a2 JE	163	struct ip_esp_hdr _esph;
a47362a2 JE	164	const struct ip_esp_hdr *eh;
1da177e4 LT	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: {
a47362a2 JE	204	struct tcphdr _tcph;
a47362a2 JE	205	const struct tcphdr *th;
1da177e4 LT	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
3666ed1c JP	251	if ((logflags & IP6T_LOG_TCPOPT) &&
3666ed1c JP	252	th->doff * 4 > sizeof(struct tcphdr)) {
a47362a2 JE	253	u_int8_t _opt[60 - sizeof(struct tcphdr)];
a47362a2 JE	254	const u_int8_t *op;
1da177e4 LT	255	unsigned int i;
	256	unsigned int optsize = th->doff * 4
	257	- sizeof(struct tcphdr);
	258
	259	op = skb_header_pointer(skb,
	260	ptr + sizeof(struct tcphdr),
	261	optsize, _opt);
	262	if (op == NULL) {
	263	printk("OPT (TRUNCATED)");
	264	return;
	265	}
	266
	267	/* Max length: 127 "OPT (" 1542chars ") " */
	268	printk("OPT (");
	269	for (i =0; i < optsize; i++)
	270	printk("%02X", op[i]);
	271	printk(") ");
	272	}
	273	break;
	274	}
ba4e58ec GR	275	case IPPROTO_UDP:
ba4e58ec GR	276	case IPPROTO_UDPLITE: {
a47362a2 JE	277	struct udphdr _udph;
a47362a2 JE	278	const struct udphdr *uh;
1da177e4	279
ba4e58ec GR	280	if (currenthdr == IPPROTO_UDP)
	281	/* Max length: 10 "PROTO=UDP " */
	282	printk("PROTO=UDP " );
	283	else /* Max length: 14 "PROTO=UDPLITE " */
	284	printk("PROTO=UDPLITE ");
1da177e4 LT	285
	286	if (fragment)
	287	break;
	288
	289	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	290	uh = skb_header_pointer(skb, ptr, sizeof(_udph), &_udph);
	291	if (uh == NULL) {
	292	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
	293	return;
	294	}
	295
	296	/* Max length: 20 "SPT=65535 DPT=65535 " */
	297	printk("SPT=%u DPT=%u LEN=%u ",
	298	ntohs(uh->source), ntohs(uh->dest),
	299	ntohs(uh->len));
	300	break;
	301	}
	302	case IPPROTO_ICMPV6: {
a47362a2 JE	303	struct icmp6hdr _icmp6h;
a47362a2 JE	304	const struct icmp6hdr *ic;
1da177e4 LT	305
	306	/* Max length: 13 "PROTO=ICMPv6 " */
	307	printk("PROTO=ICMPv6 ");
	308
	309	if (fragment)
	310	break;
	311
	312	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	313	ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
	314	if (ic == NULL) {
	315	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
	316	return;
	317	}
	318
	319	/* Max length: 18 "TYPE=255 CODE=255 " */
	320	printk("TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);
	321
	322	switch (ic->icmp6_type) {
	323	case ICMPV6_ECHO_REQUEST:
	324	case ICMPV6_ECHO_REPLY:
	325	/* Max length: 19 "ID=65535 SEQ=65535 " */
	326	printk("ID=%u SEQ=%u ",
	327	ntohs(ic->icmp6_identifier),
	328	ntohs(ic->icmp6_sequence));
	329	break;
	330	case ICMPV6_MGM_QUERY:
	331	case ICMPV6_MGM_REPORT:
	332	case ICMPV6_MGM_REDUCTION:
	333	break;
	334
	335	case ICMPV6_PARAMPROB:
	336	/* Max length: 17 "POINTER=ffffffff " */
	337	printk("POINTER=%08x ", ntohl(ic->icmp6_pointer));
	338	/* Fall through */
	339	case ICMPV6_DEST_UNREACH:
	340	case ICMPV6_PKT_TOOBIG:
	341	case ICMPV6_TIME_EXCEED:
	342	/* Max length: 3+maxlen */
	343	if (recurse) {
	344	printk("[");
	345	dump_packet(info, skb, ptr + sizeof(_icmp6h),
	346	0);
	347	printk("] ");
	348	}
	349
	350	/* Max length: 10 "MTU=65535 " */
	351	if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
	352	printk("MTU=%u ", ntohl(ic->icmp6_mtu));
	353	}
	354	break;
	355	}
	356	/* Max length: 10 "PROTO=255 " */
	357	default:
	358	printk("PROTO=%u ", currenthdr);
	359	}
	360
	361	/* Max length: 15 "UID=4294967295 " */
608c8e4f	362	if ((logflags & IP6T_LOG_UID) && recurse && skb->sk) {
1da177e4 LT	363	read_lock_bh(&skb->sk->sk_callback_lock);
1da177e4 LT	364	if (skb->sk->sk_socket && skb->sk->sk_socket->file)
36e2a1b0	365	printk("UID=%u GID=%u ",
d76b0d9b DH	366	skb->sk->sk_socket->file->f_cred->fsuid,
d76b0d9b DH	367	skb->sk->sk_socket->file->f_cred->fsgid);
1da177e4 LT	368	read_unlock_bh(&skb->sk->sk_callback_lock);
1da177e4 LT	369	}
36e2a1b0 PM	370
	371	/* Max length: 16 "MARK=0xFFFFFFFF " */
	372	if (!recurse && skb->mark)
	373	printk("MARK=0x%x ", skb->mark);
1da177e4 LT	374	}
1da177e4 LT	375
7eb9282c PM	376	static void dump_mac_header(const struct nf_loginfo *info,
	377	const struct sk_buff *skb)
	378	{
	379	struct net_device *dev = skb->dev;
	380	unsigned int logflags = 0;
	381
	382	if (info->type == NF_LOG_TYPE_LOG)
	383	logflags = info->u.log.logflags;
	384
	385	if (!(logflags & IP6T_LOG_MACDECODE))
	386	goto fallback;
	387
	388	switch (dev->type) {
	389	case ARPHRD_ETHER:
	390	printk("MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
	391	eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
	392	ntohs(eth_hdr(skb)->h_proto));
	393	return;
	394	default:
	395	break;
	396	}
	397
	398	fallback:
	399	printk("MAC=");
	400	if (dev->hard_header_len &&
	401	skb->mac_header != skb->network_header) {
	402	const unsigned char *p = skb_mac_header(skb);
	403	unsigned int len = dev->hard_header_len;
	404	unsigned int i;
	405
	406	if (dev->type == ARPHRD_SIT &&
	407	(p -= ETH_HLEN) < skb->head)
	408	p = NULL;
	409
	410	if (p != NULL) {
	411	printk("%02x", *p++);
	412	for (i = 1; i < len; i++)
	413	printk(":%02x", p[i]);
	414	}
	415	printk(" ");
	416
	417	if (dev->type == ARPHRD_SIT) {
	418	const struct iphdr *iph =
	419	(struct iphdr *)skb_mac_header(skb);
	420	printk("TUNNEL=%pI4->%pI4 ", &iph->saddr, &iph->daddr);
	421	}
	422	} else
	423	printk(" ");
	424	}
	425
608c8e4f HW	426	static struct nf_loginfo default_loginfo = {
	427	.type = NF_LOG_TYPE_LOG,
	428	.u = {
	429	.log = {
f0d57a54	430	.level = 5,
608c8e4f HW	431	.logflags = NF_LOG_MASK,
	432	},
	433	},
	434	};
	435
1da177e4	436	static void
76108cea	437	ip6t_log_packet(u_int8_t pf,
608c8e4f	438	unsigned int hooknum,
1da177e4 LT	439	const struct sk_buff *skb,
	440	const struct net_device *in,
	441	const struct net_device *out,
608c8e4f	442	const struct nf_loginfo *loginfo,
1da177e4 LT	443	const char *prefix)
1da177e4 LT	444	{
608c8e4f HW	445	if (!loginfo)
	446	loginfo = &default_loginfo;
	447
1da177e4	448	spin_lock_bh(&log_lock);
1ab1457c	449	printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
608c8e4f	450	prefix,
1da177e4 LT	451	in ? in->name : "",
1da177e4 LT	452	out ? out->name : "");
047601bf	453
7eb9282c PM	454	/* MAC logging for input path only. */
	455	if (in && !out)
	456	dump_mac_header(loginfo, skb);
1da177e4	457
0660e03f	458	dump_packet(loginfo, skb, skb_network_offset(skb), 1);
1da177e4 LT	459	printk("\n");
	460	spin_unlock_bh(&log_lock);
	461	}
	462
	463	static unsigned int
4b560b44	464	log_tg6(struct sk_buff skb, const struct xt_action_param par)
1da177e4	465	{
7eb35586	466	const struct ip6t_log_info *loginfo = par->targinfo;
608c8e4f HW	467	struct nf_loginfo li;
	468
	469	li.type = NF_LOG_TYPE_LOG;
	470	li.u.log.level = loginfo->level;
	471	li.u.log.logflags = loginfo->logflags;
1da177e4	472
7eb35586	473	ip6t_log_packet(NFPROTO_IPV6, par->hooknum, skb, par->in, par->out,
ee999d8b	474	&li, loginfo->prefix);
6709dbbb	475	return XT_CONTINUE;
1da177e4 LT	476	}
1da177e4 LT	477
1da177e4	478
135367b8	479	static int log_tg6_check(const struct xt_tgchk_param *par)
1da177e4	480	{
af5d6dc2	481	const struct ip6t_log_info *loginfo = par->targinfo;
1da177e4	482
1da177e4	483	if (loginfo->level >= 8) {
ff67e4e4	484	pr_debug("level %u >= 8\n", loginfo->level);
d6b00a53	485	return -EINVAL;
1da177e4	486	}
1da177e4	487	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
ff67e4e4	488	pr_debug("prefix not null-terminated\n");
d6b00a53	489	return -EINVAL;
1da177e4	490	}
d6b00a53	491	return 0;
1da177e4 LT	492	}
1da177e4 LT	493
d3c5ee6d	494	static struct xt_target log_tg6_reg __read_mostly = {
1da177e4	495	.name = "LOG",
ee999d8b	496	.family = NFPROTO_IPV6,
d3c5ee6d	497	.target = log_tg6,
7f939713	498	.targetsize = sizeof(struct ip6t_log_info),
d3c5ee6d	499	.checkentry = log_tg6_check,
1da177e4 LT	500	.me = THIS_MODULE,
	501	};
	502
ca735b3a	503	static struct nf_logger ip6t_logger __read_mostly = {
608c8e4f HW	504	.name = "ip6t_LOG",
	505	.logfn = &ip6t_log_packet,
	506	.me = THIS_MODULE,
	507	};
	508
d3c5ee6d	509	static int __init log_tg6_init(void)
1da177e4	510	{
e1fd0586 JE	511	int ret;
e1fd0586 JE	512
d3c5ee6d	513	ret = xt_register_target(&log_tg6_reg);
e1fd0586 JE	514	if (ret < 0)
e1fd0586 JE	515	return ret;
ee999d8b	516	nf_log_register(NFPROTO_IPV6, &ip6t_logger);
7e2acc7e	517	return 0;
1da177e4 LT	518	}
1da177e4 LT	519
d3c5ee6d	520	static void __exit log_tg6_exit(void)
1da177e4	521	{
e92ad99c	522	nf_log_unregister(&ip6t_logger);
d3c5ee6d	523	xt_unregister_target(&log_tg6_reg);
1da177e4 LT	524	}
1da177e4 LT	525
d3c5ee6d JE	526	module_init(log_tg6_init);
d3c5ee6d JE	527	module_exit(log_tg6_exit);