netfilter: ipt_LOG: add bufferisation to call printk() once (a8defca0) · Commits · e / devices / android_kernel_xiaomi_nabu

net/ipv4/netfilter/ipt_LOG.c

+73 −72

Original line number	Original line	Diff line number	Diff line
	@@ -24,16 +24,15 @@
	#include <linux/netfilter/x_tables.h>		#include <linux/netfilter/x_tables.h>
	#include <linux/netfilter_ipv4/ipt_LOG.h>		#include <linux/netfilter_ipv4/ipt_LOG.h>
	#include <net/netfilter/nf_log.h>		#include <net/netfilter/nf_log.h>
			#include <net/netfilter/xt_log.h>

	MODULE_LICENSE("GPL");		MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");		MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
	MODULE_DESCRIPTION("Xtables: IPv4 packet logging to syslog");		MODULE_DESCRIPTION("Xtables: IPv4 packet logging to syslog");

	/* Use lock to serialize, so printks don't overlap */
	static DEFINE_SPINLOCK(log_lock);

	/* One level of recursion won't kill us */		/* One level of recursion won't kill us */
	static void dump_packet(const struct nf_loginfo *info,		static void dump_packet(struct sbuff *m,
			const struct nf_loginfo *info,
	const struct sk_buff *skb,		const struct sk_buff *skb,
	unsigned int iphoff)		unsigned int iphoff)
	{		{
	@@ -48,32 +47,32 @@ static void dump_packet(const struct nf_loginfo *info,

	ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);		ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
	if (ih == NULL) {		if (ih == NULL) {
	printk("TRUNCATED");		sb_add(m, "TRUNCATED");
	return;		return;
	}		}

	/* Important fields:		/* Important fields:
	* TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */		* TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */
	/* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */		/* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */
	printk("SRC=%pI4 DST=%pI4 ",		sb_add(m, "SRC=%pI4 DST=%pI4 ",
	&ih->saddr, &ih->daddr);		&ih->saddr, &ih->daddr);

	/* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */		/* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */
	printk("LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",		sb_add(m, "LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
	ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK,		ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK,
	ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id));		ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id));

	/* Max length: 6 "CE DF MF " */		/* Max length: 6 "CE DF MF " */
	if (ntohs(ih->frag_off) & IP_CE)		if (ntohs(ih->frag_off) & IP_CE)
	printk("CE ");		sb_add(m, "CE ");
	if (ntohs(ih->frag_off) & IP_DF)		if (ntohs(ih->frag_off) & IP_DF)
	printk("DF ");		sb_add(m, "DF ");
	if (ntohs(ih->frag_off) & IP_MF)		if (ntohs(ih->frag_off) & IP_MF)
	printk("MF ");		sb_add(m, "MF ");

	/* Max length: 11 "FRAG:65535 " */		/* Max length: 11 "FRAG:65535 " */
	if (ntohs(ih->frag_off) & IP_OFFSET)		if (ntohs(ih->frag_off) & IP_OFFSET)
	printk("FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);		sb_add(m, "FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);

	if ((logflags & IPT_LOG_IPOPT) &&		if ((logflags & IPT_LOG_IPOPT) &&
	ih->ihl * 4 > sizeof(struct iphdr)) {		ih->ihl * 4 > sizeof(struct iphdr)) {
	@@ -85,15 +84,15 @@ static void dump_packet(const struct nf_loginfo *info,
	op = skb_header_pointer(skb, iphoff+sizeof(_iph),		op = skb_header_pointer(skb, iphoff+sizeof(_iph),
	optsize, _opt);		optsize, _opt);
	if (op == NULL) {		if (op == NULL) {
	printk("TRUNCATED");		sb_add(m, "TRUNCATED");
	return;		return;
	}		}

	/* Max length: 127 "OPT (" 1542chars ") " */		/* Max length: 127 "OPT (" 1542chars ") " */
	printk("OPT (");		sb_add(m, "OPT (");
	for (i = 0; i < optsize; i++)		for (i = 0; i < optsize; i++)
	printk("%02X", op[i]);		sb_add(m, "%02X", op[i]);
	printk(") ");		sb_add(m, ") ");
	}		}

	switch (ih->protocol) {		switch (ih->protocol) {
	@@ -102,7 +101,7 @@ static void dump_packet(const struct nf_loginfo *info,
	const struct tcphdr *th;		const struct tcphdr *th;

	/* Max length: 10 "PROTO=TCP " */		/* Max length: 10 "PROTO=TCP " */
	printk("PROTO=TCP ");		sb_add(m, "PROTO=TCP ");

	if (ntohs(ih->frag_off) & IP_OFFSET)		if (ntohs(ih->frag_off) & IP_OFFSET)
	break;		break;
	@@ -111,41 +110,41 @@ static void dump_packet(const struct nf_loginfo *info,
	th = skb_header_pointer(skb, iphoff + ih->ihl * 4,		th = skb_header_pointer(skb, iphoff + ih->ihl * 4,
	sizeof(_tcph), &_tcph);		sizeof(_tcph), &_tcph);
	if (th == NULL) {		if (th == NULL) {
	printk("INCOMPLETE [%u bytes] ",		sb_add(m, "INCOMPLETE [%u bytes] ",
	skb->len - iphoff - ih->ihl*4);		skb->len - iphoff - ih->ihl*4);
	break;		break;
	}		}

	/* Max length: 20 "SPT=65535 DPT=65535 " */		/* Max length: 20 "SPT=65535 DPT=65535 " */
	printk("SPT=%u DPT=%u ",		sb_add(m, "SPT=%u DPT=%u ",
	ntohs(th->source), ntohs(th->dest));		ntohs(th->source), ntohs(th->dest));
	/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */		/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
	if (logflags & IPT_LOG_TCPSEQ)		if (logflags & IPT_LOG_TCPSEQ)
	printk("SEQ=%u ACK=%u ",		sb_add(m, "SEQ=%u ACK=%u ",
	ntohl(th->seq), ntohl(th->ack_seq));		ntohl(th->seq), ntohl(th->ack_seq));
	/* Max length: 13 "WINDOW=65535 " */		/* Max length: 13 "WINDOW=65535 " */
	printk("WINDOW=%u ", ntohs(th->window));		sb_add(m, "WINDOW=%u ", ntohs(th->window));
	/* Max length: 9 "RES=0x3F " */		/* Max length: 9 "RES=0x3F " */
	printk("RES=0x%02x ", (u8)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22));		sb_add(m, "RES=0x%02x ", (u8)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22));
	/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */		/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
	if (th->cwr)		if (th->cwr)
	printk("CWR ");		sb_add(m, "CWR ");
	if (th->ece)		if (th->ece)
	printk("ECE ");		sb_add(m, "ECE ");
	if (th->urg)		if (th->urg)
	printk("URG ");		sb_add(m, "URG ");
	if (th->ack)		if (th->ack)
	printk("ACK ");		sb_add(m, "ACK ");
	if (th->psh)		if (th->psh)
	printk("PSH ");		sb_add(m, "PSH ");
	if (th->rst)		if (th->rst)
	printk("RST ");		sb_add(m, "RST ");
	if (th->syn)		if (th->syn)
	printk("SYN ");		sb_add(m, "SYN ");
	if (th->fin)		if (th->fin)
	printk("FIN ");		sb_add(m, "FIN ");
	/* Max length: 11 "URGP=65535 " */		/* Max length: 11 "URGP=65535 " */
	printk("URGP=%u ", ntohs(th->urg_ptr));		sb_add(m, "URGP=%u ", ntohs(th->urg_ptr));

	if ((logflags & IPT_LOG_TCPOPT) &&		if ((logflags & IPT_LOG_TCPOPT) &&
	th->doff * 4 > sizeof(struct tcphdr)) {		th->doff * 4 > sizeof(struct tcphdr)) {
	@@ -158,15 +157,15 @@ static void dump_packet(const struct nf_loginfo *info,
	iphoff+ih->ihl*4+sizeof(_tcph),		iphoff+ih->ihl*4+sizeof(_tcph),
	optsize, _opt);		optsize, _opt);
	if (op == NULL) {		if (op == NULL) {
	printk("TRUNCATED");		sb_add(m, "TRUNCATED");
	return;		return;
	}		}

	/* Max length: 127 "OPT (" 1542chars ") " */		/* Max length: 127 "OPT (" 1542chars ") " */
	printk("OPT (");		sb_add(m, "OPT (");
	for (i = 0; i < optsize; i++)		for (i = 0; i < optsize; i++)
	printk("%02X", op[i]);		sb_add(m, "%02X", op[i]);
	printk(") ");		sb_add(m, ") ");
	}		}
	break;		break;
	}		}
	@@ -177,9 +176,9 @@ static void dump_packet(const struct nf_loginfo *info,

	if (ih->protocol == IPPROTO_UDP)		if (ih->protocol == IPPROTO_UDP)
	/* Max length: 10 "PROTO=UDP " */		/* Max length: 10 "PROTO=UDP " */
	printk("PROTO=UDP " );		sb_add(m, "PROTO=UDP " );
	else /* Max length: 14 "PROTO=UDPLITE " */		else /* Max length: 14 "PROTO=UDPLITE " */
	printk("PROTO=UDPLITE ");		sb_add(m, "PROTO=UDPLITE ");

	if (ntohs(ih->frag_off) & IP_OFFSET)		if (ntohs(ih->frag_off) & IP_OFFSET)
	break;		break;
	@@ -188,13 +187,13 @@ static void dump_packet(const struct nf_loginfo *info,
	uh = skb_header_pointer(skb, iphoff+ih->ihl*4,		uh = skb_header_pointer(skb, iphoff+ih->ihl*4,
	sizeof(_udph), &_udph);		sizeof(_udph), &_udph);
	if (uh == NULL) {		if (uh == NULL) {
	printk("INCOMPLETE [%u bytes] ",		sb_add(m, "INCOMPLETE [%u bytes] ",
	skb->len - iphoff - ih->ihl*4);		skb->len - iphoff - ih->ihl*4);
	break;		break;
	}		}

	/* Max length: 20 "SPT=65535 DPT=65535 " */		/* Max length: 20 "SPT=65535 DPT=65535 " */
	printk("SPT=%u DPT=%u LEN=%u ",		sb_add(m, "SPT=%u DPT=%u LEN=%u ",
	ntohs(uh->source), ntohs(uh->dest),		ntohs(uh->source), ntohs(uh->dest),
	ntohs(uh->len));		ntohs(uh->len));
	break;		break;
	@@ -221,7 +220,7 @@ static void dump_packet(const struct nf_loginfo *info,
	[ICMP_ADDRESSREPLY] = 12 };		[ICMP_ADDRESSREPLY] = 12 };

	/* Max length: 11 "PROTO=ICMP " */		/* Max length: 11 "PROTO=ICMP " */
	printk("PROTO=ICMP ");		sb_add(m, "PROTO=ICMP ");

	if (ntohs(ih->frag_off) & IP_OFFSET)		if (ntohs(ih->frag_off) & IP_OFFSET)
	break;		break;
	@@ -230,19 +229,19 @@ static void dump_packet(const struct nf_loginfo *info,
	ich = skb_header_pointer(skb, iphoff + ih->ihl * 4,		ich = skb_header_pointer(skb, iphoff + ih->ihl * 4,
	sizeof(_icmph), &_icmph);		sizeof(_icmph), &_icmph);
	if (ich == NULL) {		if (ich == NULL) {
	printk("INCOMPLETE [%u bytes] ",		sb_add(m, "INCOMPLETE [%u bytes] ",
	skb->len - iphoff - ih->ihl*4);		skb->len - iphoff - ih->ihl*4);
	break;		break;
	}		}

	/* Max length: 18 "TYPE=255 CODE=255 " */		/* Max length: 18 "TYPE=255 CODE=255 " */
	printk("TYPE=%u CODE=%u ", ich->type, ich->code);		sb_add(m, "TYPE=%u CODE=%u ", ich->type, ich->code);

	/* Max length: 25 "INCOMPLETE [65535 bytes] " */		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	if (ich->type <= NR_ICMP_TYPES &&		if (ich->type <= NR_ICMP_TYPES &&
	required_len[ich->type] &&		required_len[ich->type] &&
	skb->len-iphoff-ih->ihl*4 < required_len[ich->type]) {		skb->len-iphoff-ih->ihl*4 < required_len[ich->type]) {
	printk("INCOMPLETE [%u bytes] ",		sb_add(m, "INCOMPLETE [%u bytes] ",
	skb->len - iphoff - ih->ihl*4);		skb->len - iphoff - ih->ihl*4);
	break;		break;
	}		}
	@@ -251,35 +250,35 @@ static void dump_packet(const struct nf_loginfo *info,
	case ICMP_ECHOREPLY:		case ICMP_ECHOREPLY:
	case ICMP_ECHO:		case ICMP_ECHO:
	/* Max length: 19 "ID=65535 SEQ=65535 " */		/* Max length: 19 "ID=65535 SEQ=65535 " */
	printk("ID=%u SEQ=%u ",		sb_add(m, "ID=%u SEQ=%u ",
	ntohs(ich->un.echo.id),		ntohs(ich->un.echo.id),
	ntohs(ich->un.echo.sequence));		ntohs(ich->un.echo.sequence));
	break;		break;

	case ICMP_PARAMETERPROB:		case ICMP_PARAMETERPROB:
	/* Max length: 14 "PARAMETER=255 " */		/* Max length: 14 "PARAMETER=255 " */
	printk("PARAMETER=%u ",		sb_add(m, "PARAMETER=%u ",
	ntohl(ich->un.gateway) >> 24);		ntohl(ich->un.gateway) >> 24);
	break;		break;
	case ICMP_REDIRECT:		case ICMP_REDIRECT:
	/* Max length: 24 "GATEWAY=255.255.255.255 " */		/* Max length: 24 "GATEWAY=255.255.255.255 " */
	printk("GATEWAY=%pI4 ", &ich->un.gateway);		sb_add(m, "GATEWAY=%pI4 ", &ich->un.gateway);
	/* Fall through */		/* Fall through */
	case ICMP_DEST_UNREACH:		case ICMP_DEST_UNREACH:
	case ICMP_SOURCE_QUENCH:		case ICMP_SOURCE_QUENCH:
	case ICMP_TIME_EXCEEDED:		case ICMP_TIME_EXCEEDED:
	/* Max length: 3+maxlen */		/* Max length: 3+maxlen */
	if (!iphoff) { /* Only recurse once. */		if (!iphoff) { /* Only recurse once. */
	printk("[");		sb_add(m, "[");
	dump_packet(info, skb,		dump_packet(m, info, skb,
	iphoff + ih->ihl*4+sizeof(_icmph));		iphoff + ih->ihl*4+sizeof(_icmph));
	printk("] ");		sb_add(m, "] ");
	}		}

	/* Max length: 10 "MTU=65535 " */		/* Max length: 10 "MTU=65535 " */
	if (ich->type == ICMP_DEST_UNREACH &&		if (ich->type == ICMP_DEST_UNREACH &&
	ich->code == ICMP_FRAG_NEEDED)		ich->code == ICMP_FRAG_NEEDED)
	printk("MTU=%u ", ntohs(ich->un.frag.mtu));		sb_add(m, "MTU=%u ", ntohs(ich->un.frag.mtu));
	}		}
	break;		break;
	}		}
	@@ -292,19 +291,19 @@ static void dump_packet(const struct nf_loginfo *info,
	break;		break;

	/* Max length: 9 "PROTO=AH " */		/* Max length: 9 "PROTO=AH " */
	printk("PROTO=AH ");		sb_add(m, "PROTO=AH ");

	/* Max length: 25 "INCOMPLETE [65535 bytes] " */		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	ah = skb_header_pointer(skb, iphoff+ih->ihl*4,		ah = skb_header_pointer(skb, iphoff+ih->ihl*4,
	sizeof(_ahdr), &_ahdr);		sizeof(_ahdr), &_ahdr);
	if (ah == NULL) {		if (ah == NULL) {
	printk("INCOMPLETE [%u bytes] ",		sb_add(m, "INCOMPLETE [%u bytes] ",
	skb->len - iphoff - ih->ihl*4);		skb->len - iphoff - ih->ihl*4);
	break;		break;
	}		}

	/* Length: 15 "SPI=0xF1234567 " */		/* Length: 15 "SPI=0xF1234567 " */
	printk("SPI=0x%x ", ntohl(ah->spi));		sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
	break;		break;
	}		}
	case IPPROTO_ESP: {		case IPPROTO_ESP: {
	@@ -312,7 +311,7 @@ static void dump_packet(const struct nf_loginfo *info,
	const struct ip_esp_hdr *eh;		const struct ip_esp_hdr *eh;

	/* Max length: 10 "PROTO=ESP " */		/* Max length: 10 "PROTO=ESP " */
	printk("PROTO=ESP ");		sb_add(m, "PROTO=ESP ");

	if (ntohs(ih->frag_off) & IP_OFFSET)		if (ntohs(ih->frag_off) & IP_OFFSET)
	break;		break;
	@@ -321,25 +320,25 @@ static void dump_packet(const struct nf_loginfo *info,
	eh = skb_header_pointer(skb, iphoff+ih->ihl*4,		eh = skb_header_pointer(skb, iphoff+ih->ihl*4,
	sizeof(_esph), &_esph);		sizeof(_esph), &_esph);
	if (eh == NULL) {		if (eh == NULL) {
	printk("INCOMPLETE [%u bytes] ",		sb_add(m, "INCOMPLETE [%u bytes] ",
	skb->len - iphoff - ih->ihl*4);		skb->len - iphoff - ih->ihl*4);
	break;		break;
	}		}

	/* Length: 15 "SPI=0xF1234567 " */		/* Length: 15 "SPI=0xF1234567 " */
	printk("SPI=0x%x ", ntohl(eh->spi));		sb_add(m, "SPI=0x%x ", ntohl(eh->spi));
	break;		break;
	}		}
	/* Max length: 10 "PROTO 255 " */		/* Max length: 10 "PROTO 255 " */
	default:		default:
	printk("PROTO=%u ", ih->protocol);		sb_add(m, "PROTO=%u ", ih->protocol);
	}		}

	/* Max length: 15 "UID=4294967295 " */		/* Max length: 15 "UID=4294967295 " */
	if ((logflags & IPT_LOG_UID) && !iphoff && skb->sk) {		if ((logflags & IPT_LOG_UID) && !iphoff && skb->sk) {
	read_lock_bh(&skb->sk->sk_callback_lock);		read_lock_bh(&skb->sk->sk_callback_lock);
	if (skb->sk->sk_socket && skb->sk->sk_socket->file)		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
	printk("UID=%u GID=%u ",		sb_add(m, "UID=%u GID=%u ",
	skb->sk->sk_socket->file->f_cred->fsuid,		skb->sk->sk_socket->file->f_cred->fsuid,
	skb->sk->sk_socket->file->f_cred->fsgid);		skb->sk->sk_socket->file->f_cred->fsgid);
	read_unlock_bh(&skb->sk->sk_callback_lock);		read_unlock_bh(&skb->sk->sk_callback_lock);
	@@ -347,7 +346,7 @@ static void dump_packet(const struct nf_loginfo *info,

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

	/* Proto Max log string length */		/* Proto Max log string length */
	/* IP: 40+46+6+11+127 = 230 */		/* IP: 40+46+6+11+127 = 230 */
	@@ -364,7 +363,8 @@ static void dump_packet(const struct nf_loginfo *info,
	/* maxlen = 230+ 91 + 230 + 252 = 803 */		/* maxlen = 230+ 91 + 230 + 252 = 803 */
	}		}

	static void dump_mac_header(const struct nf_loginfo *info,		static void dump_mac_header(struct sbuff *m,
			const struct nf_loginfo *info,
	const struct sk_buff *skb)		const struct sk_buff *skb)
	{		{
	struct net_device *dev = skb->dev;		struct net_device *dev = skb->dev;
	@@ -378,7 +378,7 @@ static void dump_mac_header(const struct nf_loginfo *info,

	switch (dev->type) {		switch (dev->type) {
	case ARPHRD_ETHER:		case ARPHRD_ETHER:
	printk("MACSRC=%pM MACDST=%pM MACPROTO=%04x ",		sb_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
	eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,		eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
	ntohs(eth_hdr(skb)->h_proto));		ntohs(eth_hdr(skb)->h_proto));
	return;		return;
	@@ -387,17 +387,17 @@ static void dump_mac_header(const struct nf_loginfo *info,
	}		}

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

	printk("%02x", *p++);		sb_add(m, "%02x", *p++);
	for (i = 1; i < dev->hard_header_len; i++, p++)		for (i = 1; i < dev->hard_header_len; i++, p++)
	printk(":%02x", *p);		sb_add(m, ":%02x", *p);
	}		}
	printk(" ");		sb_add(m, " ");
	}		}

	static struct nf_loginfo default_loginfo = {		static struct nf_loginfo default_loginfo = {
	@@ -419,11 +419,12 @@ ipt_log_packet(u_int8_t pf,
	const struct nf_loginfo *loginfo,		const struct nf_loginfo *loginfo,
	const char *prefix)		const char *prefix)
	{		{
			struct sbuff *m = sb_open();

	if (!loginfo)		if (!loginfo)
	loginfo = &default_loginfo;		loginfo = &default_loginfo;

	spin_lock_bh(&log_lock);		sb_add(m, "<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
	printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
	prefix,		prefix,
	in ? in->name : "",		in ? in->name : "",
	out ? out->name : "");		out ? out->name : "");
	@@ -434,20 +435,20 @@ ipt_log_packet(u_int8_t pf,

	physindev = skb->nf_bridge->physindev;		physindev = skb->nf_bridge->physindev;
	if (physindev && in != physindev)		if (physindev && in != physindev)
	printk("PHYSIN=%s ", physindev->name);		sb_add(m, "PHYSIN=%s ", physindev->name);
	physoutdev = skb->nf_bridge->physoutdev;		physoutdev = skb->nf_bridge->physoutdev;
	if (physoutdev && out != physoutdev)		if (physoutdev && out != physoutdev)
	printk("PHYSOUT=%s ", physoutdev->name);		sb_add(m, "PHYSOUT=%s ", physoutdev->name);
	}		}
	#endif		#endif

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

			dump_packet(m, loginfo, skb, 0);

	dump_packet(loginfo, skb, 0);		sb_close(m);
	printk("\n");
	spin_unlock_bh(&log_lock);
	}		}

	static unsigned int		static unsigned int

net/ipv6/netfilter/ip6t_LOG.c

+79 −78

Original line number	Original line	Diff line number	Diff line
	@@ -23,6 +23,7 @@
	#include <linux/netfilter/x_tables.h>		#include <linux/netfilter/x_tables.h>
	#include <linux/netfilter_ipv6/ip6_tables.h>		#include <linux/netfilter_ipv6/ip6_tables.h>
	#include <net/netfilter/nf_log.h>		#include <net/netfilter/nf_log.h>
			#include <net/netfilter/xt_log.h>

	MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");		MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
	MODULE_DESCRIPTION("Xtables: IPv6 packet logging to syslog");		MODULE_DESCRIPTION("Xtables: IPv6 packet logging to syslog");
	@@ -32,11 +33,9 @@ struct in_device;
	#include <net/route.h>		#include <net/route.h>
	#include <linux/netfilter_ipv6/ip6t_LOG.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 */		/* One level of recursion won't kill us */
	static void dump_packet(const struct nf_loginfo *info,		static void dump_packet(struct sbuff *m,
			const struct nf_loginfo *info,
	const struct sk_buff *skb, unsigned int ip6hoff,		const struct sk_buff *skb, unsigned int ip6hoff,
	int recurse)		int recurse)
	{		{
	@@ -55,15 +54,15 @@ static void dump_packet(const struct nf_loginfo *info,

	ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);		ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
	if (ih == NULL) {		if (ih == NULL) {
	printk("TRUNCATED");		sb_add(m, "TRUNCATED");
	return;		return;
	}		}

	/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */		/* 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);		sb_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);

	/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */		/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
	printk("LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",		sb_add(m, "LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
	ntohs(ih->payload_len) + sizeof(struct ipv6hdr),		ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
	(ntohl((__be32 )ih) & 0x0ff00000) >> 20,		(ntohl((__be32 )ih) & 0x0ff00000) >> 20,
	ih->hop_limit,		ih->hop_limit,
	@@ -78,35 +77,35 @@ static void dump_packet(const struct nf_loginfo *info,

	hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);		hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
	if (hp == NULL) {		if (hp == NULL) {
	printk("TRUNCATED");		sb_add(m, "TRUNCATED");
	return;		return;
	}		}

	/* Max length: 48 "OPT (...) " */		/* Max length: 48 "OPT (...) " */
	if (logflags & IP6T_LOG_IPOPT)		if (logflags & IP6T_LOG_IPOPT)
	printk("OPT ( ");		sb_add(m, "OPT ( ");

	switch (currenthdr) {		switch (currenthdr) {
	case IPPROTO_FRAGMENT: {		case IPPROTO_FRAGMENT: {
	struct frag_hdr _fhdr;		struct frag_hdr _fhdr;
	const struct frag_hdr *fh;		const struct frag_hdr *fh;

	printk("FRAG:");		sb_add(m, "FRAG:");
	fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),		fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
	&_fhdr);		&_fhdr);
	if (fh == NULL) {		if (fh == NULL) {
	printk("TRUNCATED ");		sb_add(m, "TRUNCATED ");
	return;		return;
	}		}

	/* Max length: 6 "65535 " */		/* Max length: 6 "65535 " */
	printk("%u ", ntohs(fh->frag_off) & 0xFFF8);		sb_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);

	/* Max length: 11 "INCOMPLETE " */		/* Max length: 11 "INCOMPLETE " */
	if (fh->frag_off & htons(0x0001))		if (fh->frag_off & htons(0x0001))
	printk("INCOMPLETE ");		sb_add(m, "INCOMPLETE ");

	printk("ID:%08x ", ntohl(fh->identification));		sb_add(m, "ID:%08x ", ntohl(fh->identification));

	if (ntohs(fh->frag_off) & 0xFFF8)		if (ntohs(fh->frag_off) & 0xFFF8)
	fragment = 1;		fragment = 1;
	@@ -120,7 +119,7 @@ static void dump_packet(const struct nf_loginfo *info,
	case IPPROTO_HOPOPTS:		case IPPROTO_HOPOPTS:
	if (fragment) {		if (fragment) {
	if (logflags & IP6T_LOG_IPOPT)		if (logflags & IP6T_LOG_IPOPT)
	printk(")");		sb_add(m, ")");
	return;		return;
	}		}
	hdrlen = ipv6_optlen(hp);		hdrlen = ipv6_optlen(hp);
	@@ -132,10 +131,10 @@ static void dump_packet(const struct nf_loginfo *info,
	const struct ip_auth_hdr *ah;		const struct ip_auth_hdr *ah;

	/* Max length: 3 "AH " */		/* Max length: 3 "AH " */
	printk("AH ");		sb_add(m, "AH ");

	if (fragment) {		if (fragment) {
	printk(")");		sb_add(m, ")");
	return;		return;
	}		}

	@@ -146,13 +145,13 @@ static void dump_packet(const struct nf_loginfo *info,
	* Max length: 26 "INCOMPLETE [65535		* Max length: 26 "INCOMPLETE [65535
	* bytes] )"		* bytes] )"
	*/		*/
	printk("INCOMPLETE [%u bytes] )",		sb_add(m, "INCOMPLETE [%u bytes] )",
	skb->len - ptr);		skb->len - ptr);
	return;		return;
	}		}

	/* Length: 15 "SPI=0xF1234567 */		/* Length: 15 "SPI=0xF1234567 */
	printk("SPI=0x%x ", ntohl(ah->spi));		sb_add(m, "SPI=0x%x ", ntohl(ah->spi));

	}		}

	@@ -164,10 +163,10 @@ static void dump_packet(const struct nf_loginfo *info,
	const struct ip_esp_hdr *eh;		const struct ip_esp_hdr *eh;

	/* Max length: 4 "ESP " */		/* Max length: 4 "ESP " */
	printk("ESP ");		sb_add(m, "ESP ");

	if (fragment) {		if (fragment) {
	printk(")");		sb_add(m, ")");
	return;		return;
	}		}

	@@ -177,23 +176,23 @@ static void dump_packet(const struct nf_loginfo *info,
	eh = skb_header_pointer(skb, ptr, sizeof(_esph),		eh = skb_header_pointer(skb, ptr, sizeof(_esph),
	&_esph);		&_esph);
	if (eh == NULL) {		if (eh == NULL) {
	printk("INCOMPLETE [%u bytes] )",		sb_add(m, "INCOMPLETE [%u bytes] )",
	skb->len - ptr);		skb->len - ptr);
	return;		return;
	}		}

	/* Length: 16 "SPI=0xF1234567 )" */		/* Length: 16 "SPI=0xF1234567 )" */
	printk("SPI=0x%x )", ntohl(eh->spi) );		sb_add(m, "SPI=0x%x )", ntohl(eh->spi) );

	}		}
	return;		return;
	default:		default:
	/* Max length: 20 "Unknown Ext Hdr 255" */		/* Max length: 20 "Unknown Ext Hdr 255" */
	printk("Unknown Ext Hdr %u", currenthdr);		sb_add(m, "Unknown Ext Hdr %u", currenthdr);
	return;		return;
	}		}
	if (logflags & IP6T_LOG_IPOPT)		if (logflags & IP6T_LOG_IPOPT)
	printk(") ");		sb_add(m, ") ");

	currenthdr = hp->nexthdr;		currenthdr = hp->nexthdr;
	ptr += hdrlen;		ptr += hdrlen;
	@@ -205,7 +204,7 @@ static void dump_packet(const struct nf_loginfo *info,
	const struct tcphdr *th;		const struct tcphdr *th;

	/* Max length: 10 "PROTO=TCP " */		/* Max length: 10 "PROTO=TCP " */
	printk("PROTO=TCP ");		sb_add(m, "PROTO=TCP ");

	if (fragment)		if (fragment)
	break;		break;
	@@ -213,40 +212,40 @@ static void dump_packet(const struct nf_loginfo *info,
	/* Max length: 25 "INCOMPLETE [65535 bytes] " */		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	th = skb_header_pointer(skb, ptr, sizeof(_tcph), &_tcph);		th = skb_header_pointer(skb, ptr, sizeof(_tcph), &_tcph);
	if (th == NULL) {		if (th == NULL) {
	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);		sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - ptr);
	return;		return;
	}		}

	/* Max length: 20 "SPT=65535 DPT=65535 " */		/* Max length: 20 "SPT=65535 DPT=65535 " */
	printk("SPT=%u DPT=%u ",		sb_add(m, "SPT=%u DPT=%u ",
	ntohs(th->source), ntohs(th->dest));		ntohs(th->source), ntohs(th->dest));
	/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */		/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
	if (logflags & IP6T_LOG_TCPSEQ)		if (logflags & IP6T_LOG_TCPSEQ)
	printk("SEQ=%u ACK=%u ",		sb_add(m, "SEQ=%u ACK=%u ",
	ntohl(th->seq), ntohl(th->ack_seq));		ntohl(th->seq), ntohl(th->ack_seq));
	/* Max length: 13 "WINDOW=65535 " */		/* Max length: 13 "WINDOW=65535 " */
	printk("WINDOW=%u ", ntohs(th->window));		sb_add(m, "WINDOW=%u ", ntohs(th->window));
	/* Max length: 9 "RES=0x3C " */		/* Max length: 9 "RES=0x3C " */
	printk("RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22));		sb_add(m, "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 " */		/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
	if (th->cwr)		if (th->cwr)
	printk("CWR ");		sb_add(m, "CWR ");
	if (th->ece)		if (th->ece)
	printk("ECE ");		sb_add(m, "ECE ");
	if (th->urg)		if (th->urg)
	printk("URG ");		sb_add(m, "URG ");
	if (th->ack)		if (th->ack)
	printk("ACK ");		sb_add(m, "ACK ");
	if (th->psh)		if (th->psh)
	printk("PSH ");		sb_add(m, "PSH ");
	if (th->rst)		if (th->rst)
	printk("RST ");		sb_add(m, "RST ");
	if (th->syn)		if (th->syn)
	printk("SYN ");		sb_add(m, "SYN ");
	if (th->fin)		if (th->fin)
	printk("FIN ");		sb_add(m, "FIN ");
	/* Max length: 11 "URGP=65535 " */		/* Max length: 11 "URGP=65535 " */
	printk("URGP=%u ", ntohs(th->urg_ptr));		sb_add(m, "URGP=%u ", ntohs(th->urg_ptr));

	if ((logflags & IP6T_LOG_TCPOPT) &&		if ((logflags & IP6T_LOG_TCPOPT) &&
	th->doff * 4 > sizeof(struct tcphdr)) {		th->doff * 4 > sizeof(struct tcphdr)) {
	@@ -260,15 +259,15 @@ static void dump_packet(const struct nf_loginfo *info,
	ptr + sizeof(struct tcphdr),		ptr + sizeof(struct tcphdr),
	optsize, _opt);		optsize, _opt);
	if (op == NULL) {		if (op == NULL) {
	printk("OPT (TRUNCATED)");		sb_add(m, "OPT (TRUNCATED)");
	return;		return;
	}		}

	/* Max length: 127 "OPT (" 1542chars ") " */		/* Max length: 127 "OPT (" 1542chars ") " */
	printk("OPT (");		sb_add(m, "OPT (");
	for (i =0; i < optsize; i++)		for (i =0; i < optsize; i++)
	printk("%02X", op[i]);		sb_add(m, "%02X", op[i]);
	printk(") ");		sb_add(m, ") ");
	}		}
	break;		break;
	}		}
	@@ -279,9 +278,9 @@ static void dump_packet(const struct nf_loginfo *info,

	if (currenthdr == IPPROTO_UDP)		if (currenthdr == IPPROTO_UDP)
	/* Max length: 10 "PROTO=UDP " */		/* Max length: 10 "PROTO=UDP " */
	printk("PROTO=UDP " );		sb_add(m, "PROTO=UDP " );
	else /* Max length: 14 "PROTO=UDPLITE " */		else /* Max length: 14 "PROTO=UDPLITE " */
	printk("PROTO=UDPLITE ");		sb_add(m, "PROTO=UDPLITE ");

	if (fragment)		if (fragment)
	break;		break;
	@@ -289,12 +288,12 @@ static void dump_packet(const struct nf_loginfo *info,
	/* Max length: 25 "INCOMPLETE [65535 bytes] " */		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	uh = skb_header_pointer(skb, ptr, sizeof(_udph), &_udph);		uh = skb_header_pointer(skb, ptr, sizeof(_udph), &_udph);
	if (uh == NULL) {		if (uh == NULL) {
	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);		sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - ptr);
	return;		return;
	}		}

	/* Max length: 20 "SPT=65535 DPT=65535 " */		/* Max length: 20 "SPT=65535 DPT=65535 " */
	printk("SPT=%u DPT=%u LEN=%u ",		sb_add(m, "SPT=%u DPT=%u LEN=%u ",
	ntohs(uh->source), ntohs(uh->dest),		ntohs(uh->source), ntohs(uh->dest),
	ntohs(uh->len));		ntohs(uh->len));
	break;		break;
	@@ -304,7 +303,7 @@ static void dump_packet(const struct nf_loginfo *info,
	const struct icmp6hdr *ic;		const struct icmp6hdr *ic;

	/* Max length: 13 "PROTO=ICMPv6 " */		/* Max length: 13 "PROTO=ICMPv6 " */
	printk("PROTO=ICMPv6 ");		sb_add(m, "PROTO=ICMPv6 ");

	if (fragment)		if (fragment)
	break;		break;
	@@ -312,18 +311,18 @@ static void dump_packet(const struct nf_loginfo *info,
	/* Max length: 25 "INCOMPLETE [65535 bytes] " */		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
	ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);		ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
	if (ic == NULL) {		if (ic == NULL) {
	printk("INCOMPLETE [%u bytes] ", skb->len - ptr);		sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - ptr);
	return;		return;
	}		}

	/* Max length: 18 "TYPE=255 CODE=255 " */		/* Max length: 18 "TYPE=255 CODE=255 " */
	printk("TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);		sb_add(m, "TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);

	switch (ic->icmp6_type) {		switch (ic->icmp6_type) {
	case ICMPV6_ECHO_REQUEST:		case ICMPV6_ECHO_REQUEST:
	case ICMPV6_ECHO_REPLY:		case ICMPV6_ECHO_REPLY:
	/* Max length: 19 "ID=65535 SEQ=65535 " */		/* Max length: 19 "ID=65535 SEQ=65535 " */
	printk("ID=%u SEQ=%u ",		sb_add(m, "ID=%u SEQ=%u ",
	ntohs(ic->icmp6_identifier),		ntohs(ic->icmp6_identifier),
	ntohs(ic->icmp6_sequence));		ntohs(ic->icmp6_sequence));
	break;		break;
	@@ -334,35 +333,35 @@ static void dump_packet(const struct nf_loginfo *info,

	case ICMPV6_PARAMPROB:		case ICMPV6_PARAMPROB:
	/* Max length: 17 "POINTER=ffffffff " */		/* Max length: 17 "POINTER=ffffffff " */
	printk("POINTER=%08x ", ntohl(ic->icmp6_pointer));		sb_add(m, "POINTER=%08x ", ntohl(ic->icmp6_pointer));
	/* Fall through */		/* Fall through */
	case ICMPV6_DEST_UNREACH:		case ICMPV6_DEST_UNREACH:
	case ICMPV6_PKT_TOOBIG:		case ICMPV6_PKT_TOOBIG:
	case ICMPV6_TIME_EXCEED:		case ICMPV6_TIME_EXCEED:
	/* Max length: 3+maxlen */		/* Max length: 3+maxlen */
	if (recurse) {		if (recurse) {
	printk("[");		sb_add(m, "[");
	dump_packet(info, skb, ptr + sizeof(_icmp6h),		dump_packet(m, info, skb,
	0);		ptr + sizeof(_icmp6h), 0);
	printk("] ");		sb_add(m, "] ");
	}		}

	/* Max length: 10 "MTU=65535 " */		/* Max length: 10 "MTU=65535 " */
	if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)		if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
	printk("MTU=%u ", ntohl(ic->icmp6_mtu));		sb_add(m, "MTU=%u ", ntohl(ic->icmp6_mtu));
	}		}
	break;		break;
	}		}
	/* Max length: 10 "PROTO=255 " */		/* Max length: 10 "PROTO=255 " */
	default:		default:
	printk("PROTO=%u ", currenthdr);		sb_add(m, "PROTO=%u ", currenthdr);
	}		}

	/* Max length: 15 "UID=4294967295 " */		/* Max length: 15 "UID=4294967295 " */
	if ((logflags & IP6T_LOG_UID) && recurse && skb->sk) {		if ((logflags & IP6T_LOG_UID) && recurse && skb->sk) {
	read_lock_bh(&skb->sk->sk_callback_lock);		read_lock_bh(&skb->sk->sk_callback_lock);
	if (skb->sk->sk_socket && skb->sk->sk_socket->file)		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
	printk("UID=%u GID=%u ",		sb_add(m, "UID=%u GID=%u ",
	skb->sk->sk_socket->file->f_cred->fsuid,		skb->sk->sk_socket->file->f_cred->fsuid,
	skb->sk->sk_socket->file->f_cred->fsgid);		skb->sk->sk_socket->file->f_cred->fsgid);
	read_unlock_bh(&skb->sk->sk_callback_lock);		read_unlock_bh(&skb->sk->sk_callback_lock);
	@@ -370,10 +369,11 @@ static void dump_packet(const struct nf_loginfo *info,

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

	static void dump_mac_header(const struct nf_loginfo *info,		static void dump_mac_header(struct sbuff *m,
			const struct nf_loginfo *info,
	const struct sk_buff *skb)		const struct sk_buff *skb)
	{		{
	struct net_device *dev = skb->dev;		struct net_device *dev = skb->dev;
	@@ -387,7 +387,7 @@ static void dump_mac_header(const struct nf_loginfo *info,

	switch (dev->type) {		switch (dev->type) {
	case ARPHRD_ETHER:		case ARPHRD_ETHER:
	printk("MACSRC=%pM MACDST=%pM MACPROTO=%04x ",		sb_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
	eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,		eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
	ntohs(eth_hdr(skb)->h_proto));		ntohs(eth_hdr(skb)->h_proto));
	return;		return;
	@@ -396,7 +396,7 @@ static void dump_mac_header(const struct nf_loginfo *info,
	}		}

	fallback:		fallback:
	printk("MAC=");		sb_add(m, "MAC=");
	if (dev->hard_header_len &&		if (dev->hard_header_len &&
	skb->mac_header != skb->network_header) {		skb->mac_header != skb->network_header) {
	const unsigned char *p = skb_mac_header(skb);		const unsigned char *p = skb_mac_header(skb);
	@@ -408,19 +408,19 @@ static void dump_mac_header(const struct nf_loginfo *info,
	p = NULL;		p = NULL;

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

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

	static struct nf_loginfo default_loginfo = {		static struct nf_loginfo default_loginfo = {
	@@ -442,22 +442,23 @@ ip6t_log_packet(u_int8_t pf,
	const struct nf_loginfo *loginfo,		const struct nf_loginfo *loginfo,
	const char *prefix)		const char *prefix)
	{		{
			struct sbuff *m = sb_open();

	if (!loginfo)		if (!loginfo)
	loginfo = &default_loginfo;		loginfo = &default_loginfo;

	spin_lock_bh(&log_lock);		sb_add(m, "<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
	printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
	prefix,		prefix,
	in ? in->name : "",		in ? in->name : "",
	out ? out->name : "");		out ? out->name : "");

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

			dump_packet(m, loginfo, skb, skb_network_offset(skb), 1);

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

	static unsigned int		static unsigned int