[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/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");

static unsigned int nflog = 1;
module_param(nflog, int, 0400);
MODULE_PARM_DESC(nflog, "register as internal netfilter logging module");
 
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 ip6t_log_info *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;

	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 (info->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 (info->logflags & IP6T_LOG_IPOPT)
					printk(")");
				return;
			}
			hdrlen = ipv6_optlen(hp);
			break;
		/* Max Length */
		case IPPROTO_AH:
			if (info->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 (info->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 (info->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 (info->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 ((info->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 ((info->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 void
ip6t_log_packet(unsigned int hooknum,
		const struct sk_buff *skb,
		const struct net_device *in,
		const struct net_device *out,
		const struct ip6t_log_info *loginfo,
		const char *level_string,
		const char *prefix)
{
	spin_lock_bh(&log_lock);
	printk(level_string);
	printk("%sIN=%s OUT=%s ",
		prefix == NULL ? loginfo->prefix : prefix,
		in ? in->name : "",
		out ? out->name : "");
	if (in && !out) {
		/* MAC logging for input chain only. */
		printk("MAC=");
		if (skb->dev && 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 < skb->dev->hard_header_len; i++)
					printk("%02x", p[i]);
			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;
	char level_string[4] = "< >";

	level_string[1] = '0' + (loginfo->level % 8);
	ip6t_log_packet(hooknum, *pskb, in, out, loginfo, level_string, NULL);

	return IP6T_CONTINUE;
}

static void
ip6t_logfn(unsigned int hooknum,
	   const struct sk_buff *skb,
	   const struct net_device *in,
	   const struct net_device *out,
	   const char *prefix)
{
	struct ip6t_log_info loginfo = {
		.level = 0,
		.logflags = IP6T_LOG_MASK,
		.prefix = ""
	};

	ip6t_log_packet(hooknum, skb, in, out, &loginfo, KERN_WARNING, prefix);
}

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 int __init init(void)
{
	if (ip6t_register_target(&ip6t_log_reg))
		return -EINVAL;
	if (nflog)
		nf_log_register(PF_INET6, &ip6t_logfn);

	return 0;
}

static void __exit fini(void)
{
	if (nflog)
		nf_log_unregister(PF_INET6, &ip6t_logfn);
	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>
	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>
	23	#include <linux/netfilter_ipv6/ip6_tables.h>
	24
	25	MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
	26	MODULE_DESCRIPTION("IP6 tables LOG target module");
	27	MODULE_LICENSE("GPL");
	28
	29	static unsigned int nflog = 1;
	30	module_param(nflog, int, 0400);
	31	MODULE_PARM_DESC(nflog, "register as internal netfilter logging module");
	32
	33	struct in_device;
	34	#include <net/route.h>
	35	#include <linux/netfilter_ipv6/ip6t_LOG.h>
	36
	37	#if 0
	38	#define DEBUGP printk
	39	#else
	40	#define DEBUGP(format, args...)
	41	#endif
	42
	43	/* Use lock to serialize, so printks don't overlap */
	44	static DEFINE_SPINLOCK(log_lock);
	45
	46	/* One level of recursion won't kill us */
	47	static void dump_packet(const struct ip6t_log_info *info,
	48	const struct sk_buff *skb, unsigned int ip6hoff,
	49	int recurse)
	50	{
	51	u_int8_t currenthdr;
	52	int fragment;
	53	struct ipv6hdr _ip6h, *ih;
	54	unsigned int ptr;
	55	unsigned int hdrlen = 0;
	56
	57	ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
	58	if (ih == NULL) {
	59	printk("TRUNCATED");
	60	return;
	61	}
	62
	63	/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000" */
	64	printk("SRC=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(ih->saddr));
65	printk("DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(ih->daddr));
66
67	/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
68	printk("LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
69	ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
70	(ntohl((u_int32_t )ih) & 0x0ff00000) >> 20,
71	ih->hop_limit,
72	(ntohl((u_int32_t )ih) & 0x000fffff));
73
74	fragment = 0;
75	ptr = ip6hoff + sizeof(struct ipv6hdr);
76	currenthdr = ih->nexthdr;
77	while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) {
78	struct ipv6_opt_hdr _hdr, *hp;
79
80	hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
81	if (hp == NULL) {
82	printk("TRUNCATED");
83	return;
84	}
85
86	/* Max length: 48 "OPT (...) " */
87	if (info->logflags & IP6T_LOG_IPOPT)
88	printk("OPT ( ");
89
90	switch (currenthdr) {
91	case IPPROTO_FRAGMENT: {
92	struct frag_hdr _fhdr, *fh;
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) {
122	if (info->logflags & IP6T_LOG_IPOPT)
123	printk(")");
124	return;
125	}
126	hdrlen = ipv6_optlen(hp);
127	break;
128	/* Max Length */
129	case IPPROTO_AH:
130	if (info->logflags & IP6T_LOG_IPOPT) {
131	struct ip_auth_hdr _ahdr, *ah;
132
133	/* Max length: 3 "AH " */
134	printk("AH ");
135
136	if (fragment) {
137	printk(")");
138	return;
139	}
140
141	ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
142	&_ahdr);
143	if (ah == NULL) {
144	/*
145	* Max length: 26 "INCOMPLETE [65535
146	* bytes] )"
147	*/
148	printk("INCOMPLETE [%u bytes] )",
149	skb->len - ptr);
150	return;
151	}
152
153	/* Length: 15 "SPI=0xF1234567 */
154	printk("SPI=0x%x ", ntohl(ah->spi));
155
156	}
157
158	hdrlen = (hp->hdrlen+2)<<2;
159	break;
160	case IPPROTO_ESP:
161	if (info->logflags & IP6T_LOG_IPOPT) {
162	struct ip_esp_hdr _esph, *eh;
163
164	/* Max length: 4 "ESP " */
165	printk("ESP ");
166
167	if (fragment) {
168	printk(")");
169	return;
170	}
171
172	/*
173	* Max length: 26 "INCOMPLETE [65535 bytes] )"
174	*/
175	eh = skb_header_pointer(skb, ptr, sizeof(_esph),
176	&_esph);
177	if (eh == NULL) {
178	printk("INCOMPLETE [%u bytes] )",
179	skb->len - ptr);
180	return;
181	}
182
183	/* Length: 16 "SPI=0xF1234567 )" */
184	printk("SPI=0x%x )", ntohl(eh->spi) );
185
186	}
187	return;
188	default:
189	/* Max length: 20 "Unknown Ext Hdr 255" */
190	printk("Unknown Ext Hdr %u", currenthdr);
191	return;
192	}
193	if (info->logflags & IP6T_LOG_IPOPT)
194	printk(") ");
195
196	currenthdr = hp->nexthdr;
197	ptr += hdrlen;
198	}
199
200	switch (currenthdr) {
201	case IPPROTO_TCP: {
202	struct tcphdr _tcph, *th;
203
204	/* Max length: 10 "PROTO=TCP " */
205	printk("PROTO=TCP ");
206
207	if (fragment)
208	break;
209
210	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
211	th = skb_header_pointer(skb, ptr, sizeof(_tcph), &_tcph);
212	if (th == NULL) {
213	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
214	return;
215	}
216
217	/* Max length: 20 "SPT=65535 DPT=65535 " */
218	printk("SPT=%u DPT=%u ",
219	ntohs(th->source), ntohs(th->dest));
220	/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
221	if (info->logflags & IP6T_LOG_TCPSEQ)
222	printk("SEQ=%u ACK=%u ",
223	ntohl(th->seq), ntohl(th->ack_seq));
224	/* Max length: 13 "WINDOW=65535 " */
225	printk("WINDOW=%u ", ntohs(th->window));
226	/* Max length: 9 "RES=0x3C " */
227	printk("RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22));
228	/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
229	if (th->cwr)
230	printk("CWR ");
231	if (th->ece)
232	printk("ECE ");
233	if (th->urg)
234	printk("URG ");
235	if (th->ack)
236	printk("ACK ");
237	if (th->psh)
238	printk("PSH ");
239	if (th->rst)
240	printk("RST ");
241	if (th->syn)
242	printk("SYN ");
243	if (th->fin)
244	printk("FIN ");
245	/* Max length: 11 "URGP=65535 " */
246	printk("URGP=%u ", ntohs(th->urg_ptr));
247
248	if ((info->logflags & IP6T_LOG_TCPOPT)
249	&& th->doff * 4 > sizeof(struct tcphdr)) {
250	u_int8_t _opt[60 - sizeof(struct tcphdr)], *op;
251	unsigned int i;
252	unsigned int optsize = th->doff * 4
253	- sizeof(struct tcphdr);
254
255	op = skb_header_pointer(skb,
256	ptr + sizeof(struct tcphdr),
257	optsize, _opt);
258	if (op == NULL) {
259	printk("OPT (TRUNCATED)");
260	return;
261	}
262
263	/* Max length: 127 "OPT (" 1542chars ") " */
264	printk("OPT (");
265	for (i =0; i < optsize; i++)
266	printk("%02X", op[i]);
267	printk(") ");
268	}
269	break;
270	}
271	case IPPROTO_UDP: {
272	struct udphdr _udph, *uh;
273
274	/* Max length: 10 "PROTO=UDP " */
275	printk("PROTO=UDP ");
276
277	if (fragment)
278	break;
279
280	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
281	uh = skb_header_pointer(skb, ptr, sizeof(_udph), &_udph);
282	if (uh == NULL) {
283	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
284	return;
285	}
286
287	/* Max length: 20 "SPT=65535 DPT=65535 " */
288	printk("SPT=%u DPT=%u LEN=%u ",
289	ntohs(uh->source), ntohs(uh->dest),
290	ntohs(uh->len));
291	break;
292	}
293	case IPPROTO_ICMPV6: {
294	struct icmp6hdr _icmp6h, *ic;
295
296	/* Max length: 13 "PROTO=ICMPv6 " */
297	printk("PROTO=ICMPv6 ");
298
299	if (fragment)
300	break;
301
302	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
303	ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
304	if (ic == NULL) {
305	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);
306	return;
307	}
308
309	/* Max length: 18 "TYPE=255 CODE=255 " */
310	printk("TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);
311
312	switch (ic->icmp6_type) {
313	case ICMPV6_ECHO_REQUEST:
314	case ICMPV6_ECHO_REPLY:
315	/* Max length: 19 "ID=65535 SEQ=65535 " */
316	printk("ID=%u SEQ=%u ",
317	ntohs(ic->icmp6_identifier),
318	ntohs(ic->icmp6_sequence));
319	break;
320	case ICMPV6_MGM_QUERY:
321	case ICMPV6_MGM_REPORT:
322	case ICMPV6_MGM_REDUCTION:
323	break;
324
325	case ICMPV6_PARAMPROB:
326	/* Max length: 17 "POINTER=ffffffff " */
327	printk("POINTER=%08x ", ntohl(ic->icmp6_pointer));
328	/* Fall through */
329	case ICMPV6_DEST_UNREACH:
330	case ICMPV6_PKT_TOOBIG:
331	case ICMPV6_TIME_EXCEED:
332	/* Max length: 3+maxlen */
333	if (recurse) {
334	printk("[");
335	dump_packet(info, skb, ptr + sizeof(_icmp6h),
336	0);
337	printk("] ");
338	}
339
340	/* Max length: 10 "MTU=65535 " */
341	if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
342	printk("MTU=%u ", ntohl(ic->icmp6_mtu));
343	}
344	break;
345	}
346	/* Max length: 10 "PROTO=255 " */
347	default:
348	printk("PROTO=%u ", currenthdr);
349	}
350
351	/* Max length: 15 "UID=4294967295 " */
352	if ((info->logflags & IP6T_LOG_UID) && recurse && skb->sk) {
353	read_lock_bh(&skb->sk->sk_callback_lock);
354	if (skb->sk->sk_socket && skb->sk->sk_socket->file)
355	printk("UID=%u ", skb->sk->sk_socket->file->f_uid);
356	read_unlock_bh(&skb->sk->sk_callback_lock);
357	}
358	}
359
360	static void
361	ip6t_log_packet(unsigned int hooknum,
362	const struct sk_buff *skb,
363	const struct net_device *in,
364	const struct net_device *out,
365	const struct ip6t_log_info *loginfo,
366	const char *level_string,
367	const char *prefix)
368	{
1da177e4 LT	369	spin_lock_bh(&log_lock);
	370	printk(level_string);
	371	printk("%sIN=%s OUT=%s ",
	372	prefix == NULL ? loginfo->prefix : prefix,
	373	in ? in->name : "",
	374	out ? out->name : "");
	375	if (in && !out) {
	376	/* MAC logging for input chain only. */
	377	printk("MAC=");
047601bf PM	378	if (skb->dev && skb->dev->hard_header_len &&
	379	skb->mac.raw != skb->nh.raw) {
	380	unsigned char *p = skb->mac.raw;
	381	int i;
	382
	383	if (skb->dev->type == ARPHRD_SIT &&
	384	(p -= ETH_HLEN) < skb->head)
	385	p = NULL;
	386
	387	if (p != NULL)
	388	for (i = 0; i < skb->dev->hard_header_len; i++)
	389	printk("%02x", p[i]);
	390	printk(" ");
	391
	392	if (skb->dev->type == ARPHRD_SIT) {
	393	struct iphdr iph = (struct iphdr )skb->mac.raw;
	394	printk("TUNNEL=%u.%u.%u.%u->%u.%u.%u.%u ",
	395	NIPQUAD(iph->saddr),
	396	NIPQUAD(iph->daddr));
1da177e4 LT	397	}
	398	} else
	399	printk(" ");
	400	}
	401
	402	dump_packet(loginfo, skb, (u8*)skb->nh.ipv6h - skb->data, 1);
	403	printk("\n");
	404	spin_unlock_bh(&log_lock);
	405	}
	406
	407	static unsigned int
	408	ip6t_log_target(struct sk_buff **pskb,
	409	const struct net_device *in,
	410	const struct net_device *out,
	411	unsigned int hooknum,
	412	const void *targinfo,
	413	void *userinfo)
	414	{
	415	const struct ip6t_log_info *loginfo = targinfo;
	416	char level_string[4] = "< >";
	417
	418	level_string[1] = '0' + (loginfo->level % 8);
	419	ip6t_log_packet(hooknum, *pskb, in, out, loginfo, level_string, NULL);
	420
	421	return IP6T_CONTINUE;
	422	}
	423
	424	static void
	425	ip6t_logfn(unsigned int hooknum,
	426	const struct sk_buff *skb,
	427	const struct net_device *in,
	428	const struct net_device *out,
	429	const char *prefix)
	430	{
	431	struct ip6t_log_info loginfo = {
	432	.level = 0,
	433	.logflags = IP6T_LOG_MASK,
	434	.prefix = ""
	435	};
	436
	437	ip6t_log_packet(hooknum, skb, in, out, &loginfo, KERN_WARNING, prefix);
	438	}
	439
	440	static int ip6t_log_checkentry(const char *tablename,
	441	const struct ip6t_entry *e,
	442	void *targinfo,
	443	unsigned int targinfosize,
	444	unsigned int hook_mask)
	445	{
	446	const struct ip6t_log_info *loginfo = targinfo;
	447
	448	if (targinfosize != IP6T_ALIGN(sizeof(struct ip6t_log_info))) {
	449	DEBUGP("LOG: targinfosize %u != %u\n",
	450	targinfosize, IP6T_ALIGN(sizeof(struct ip6t_log_info)));
	451	return 0;
	452	}
	453
	454	if (loginfo->level >= 8) {
	455	DEBUGP("LOG: level %u >= 8\n", loginfo->level);
	456	return 0;
	457	}
	458
	459	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
	460	DEBUGP("LOG: prefix term %i\n",
461	loginfo->prefix[sizeof(loginfo->prefix)-1]);
462	return 0;
463	}
464
465	return 1;
466	}
467
468	static struct ip6t_target ip6t_log_reg = {
469	.name = "LOG",
470	.target = ip6t_log_target,
471	.checkentry = ip6t_log_checkentry,
472	.me = THIS_MODULE,
473	};
474
475	static int __init init(void)
476	{
477	if (ip6t_register_target(&ip6t_log_reg))
478	return -EINVAL;
479	if (nflog)
480	nf_log_register(PF_INET6, &ip6t_logfn);
481
482	return 0;
483	}
484
485	static void __exit fini(void)
486	{
487	if (nflog)
488	nf_log_unregister(PF_INET6, &ip6t_logfn);
489	ip6t_unregister_target(&ip6t_log_reg);
490	}
491
492	module_init(init);
493	module_exit(fini);