Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 485 insertions, 0 deletions

diff --git a/net/ipv4/netfilter/ipt_LOG.c b/net/ipv4/netfilter/ipt_LOG.c
new file mode 100644
index 00000000000..ef08733d26d
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_LOG.c
@@ -0,0 +1,485 @@
+/*
+ * This is a module which is used for logging packets.
+ */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (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/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#include <net/tcp.h>
+#include <net/route.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_LOG.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("iptables syslog logging module");
+
+static unsigned int nflog = 1;
+module_param(nflog, int, 0400);
+MODULE_PARM_DESC(nflog, "register as internal netfilter logging module");
+ 
+#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 ipt_log_info *info,
+			const struct sk_buff *skb,
+			unsigned int iphoff)
+{
+	struct iphdr _iph, *ih;
+
+	ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
+	if (ih == NULL) {
+		printk("TRUNCATED");
+		return;
+	}
+
+	/* Important fields:
+	 * TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */
+	/* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */
+	printk("SRC=%u.%u.%u.%u DST=%u.%u.%u.%u ",
+	       NIPQUAD(ih->saddr), NIPQUAD(ih->daddr));
+
+	/* 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 ",
+	       ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK,
+	       ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id));
+
+	/* Max length: 6 "CE DF MF " */
+	if (ntohs(ih->frag_off) & IP_CE)
+		printk("CE ");
+	if (ntohs(ih->frag_off) & IP_DF)
+		printk("DF ");
+	if (ntohs(ih->frag_off) & IP_MF)
+		printk("MF ");
+
+	/* Max length: 11 "FRAG:65535 " */
+	if (ntohs(ih->frag_off) & IP_OFFSET)
+		printk("FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);
+
+	if ((info->logflags & IPT_LOG_IPOPT)
+	    && ih->ihl * 4 > sizeof(struct iphdr)) {
+		unsigned char _opt[4 * 15 - sizeof(struct iphdr)], *op;
+		unsigned int i, optsize;
+
+		optsize = ih->ihl * 4 - sizeof(struct iphdr);
+		op = skb_header_pointer(skb, iphoff+sizeof(_iph),
+					optsize, _opt);
+		if (op == NULL) {
+			printk("TRUNCATED");
+			return;
+		}
+
+		/* Max length: 127 "OPT (" 15*4*2chars ") " */
+		printk("OPT (");
+		for (i = 0; i < optsize; i++)
+			printk("%02X", op[i]);
+		printk(") ");
+	}
+
+	switch (ih->protocol) {
+	case IPPROTO_TCP: {
+		struct tcphdr _tcph, *th;
+
+		/* Max length: 10 "PROTO=TCP " */
+		printk("PROTO=TCP ");
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		th = skb_header_pointer(skb, iphoff + ih->ihl * 4,
+					sizeof(_tcph), &_tcph);
+		if (th == NULL) {
+			printk("INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* 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 & IPT_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=0x3F " */
+		printk("RES=0x%02x ", (u8)(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 & IPT_LOG_TCPOPT)
+		    && th->doff * 4 > sizeof(struct tcphdr)) {
+			unsigned char _opt[4 * 15 - sizeof(struct tcphdr)];
+			unsigned char *op;
+			unsigned int i, optsize;
+
+			optsize = th->doff * 4 - sizeof(struct tcphdr);
+			op = skb_header_pointer(skb,
+						iphoff+ih->ihl*4+sizeof(_tcph),
+						optsize, _opt);
+			if (op == NULL) {
+				printk("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 (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		uh = skb_header_pointer(skb, iphoff+ih->ihl*4,
+					sizeof(_udph), &_udph);
+		if (uh == NULL) {
+			printk("INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* 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_ICMP: {
+		struct icmphdr _icmph, *ich;
+		static size_t required_len[NR_ICMP_TYPES+1]
+			= { [ICMP_ECHOREPLY] = 4,
+			    [ICMP_DEST_UNREACH]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_SOURCE_QUENCH]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_REDIRECT]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_ECHO] = 4,
+			    [ICMP_TIME_EXCEEDED]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_PARAMETERPROB]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_TIMESTAMP] = 20,
+			    [ICMP_TIMESTAMPREPLY] = 20,
+			    [ICMP_ADDRESS] = 12,
+			    [ICMP_ADDRESSREPLY] = 12 };
+
+		/* Max length: 11 "PROTO=ICMP " */
+		printk("PROTO=ICMP ");
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		ich = skb_header_pointer(skb, iphoff + ih->ihl * 4,
+					 sizeof(_icmph), &_icmph);
+		if (ich == NULL) {
+			printk("INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Max length: 18 "TYPE=255 CODE=255 " */
+		printk("TYPE=%u CODE=%u ", ich->type, ich->code);
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		if (ich->type <= NR_ICMP_TYPES
+		    && required_len[ich->type]
+		    && skb->len-iphoff-ih->ihl*4 < required_len[ich->type]) {
+			printk("INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		switch (ich->type) {
+		case ICMP_ECHOREPLY:
+		case ICMP_ECHO:
+			/* Max length: 19 "ID=65535 SEQ=65535 " */
+			printk("ID=%u SEQ=%u ",
+			       ntohs(ich->un.echo.id),
+			       ntohs(ich->un.echo.sequence));
+			break;
+
+		case ICMP_PARAMETERPROB:
+			/* Max length: 14 "PARAMETER=255 " */
+			printk("PARAMETER=%u ",
+			       ntohl(ich->un.gateway) >> 24);
+			break;
+		case ICMP_REDIRECT:
+			/* Max length: 24 "GATEWAY=255.255.255.255 " */
+			printk("GATEWAY=%u.%u.%u.%u ",
+			       NIPQUAD(ich->un.gateway));
+			/* Fall through */
+		case ICMP_DEST_UNREACH:
+		case ICMP_SOURCE_QUENCH:
+		case ICMP_TIME_EXCEEDED:
+			/* Max length: 3+maxlen */
+			if (!iphoff) { /* Only recurse once. */
+				printk("[");
+				dump_packet(info, skb,
+					    iphoff + ih->ihl*4+sizeof(_icmph));
+				printk("] ");
+			}
+
+			/* Max length: 10 "MTU=65535 " */
+			if (ich->type == ICMP_DEST_UNREACH
+			    && ich->code == ICMP_FRAG_NEEDED)
+				printk("MTU=%u ", ntohs(ich->un.frag.mtu));
+		}
+		break;
+	}
+	/* Max Length */
+	case IPPROTO_AH: {
+		struct ip_auth_hdr _ahdr, *ah;
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+		
+		/* Max length: 9 "PROTO=AH " */
+		printk("PROTO=AH ");
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		ah = skb_header_pointer(skb, iphoff+ih->ihl*4,
+					sizeof(_ahdr), &_ahdr);
+		if (ah == NULL) {
+			printk("INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Length: 15 "SPI=0xF1234567 " */
+		printk("SPI=0x%x ", ntohl(ah->spi));
+		break;
+	}
+	case IPPROTO_ESP: {
+		struct ip_esp_hdr _esph, *eh;
+
+		/* Max length: 10 "PROTO=ESP " */
+		printk("PROTO=ESP ");
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		eh = skb_header_pointer(skb, iphoff+ih->ihl*4,
+					sizeof(_esph), &_esph);
+		if (eh == NULL) {
+			printk("INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Length: 15 "SPI=0xF1234567 " */
+		printk("SPI=0x%x ", ntohl(eh->spi));
+		break;
+	}
+	/* Max length: 10 "PROTO 255 " */
+	default:
+		printk("PROTO=%u ", ih->protocol);
+	}
+
+	/* Max length: 15 "UID=4294967295 " */
+ 	if ((info->logflags & IPT_LOG_UID) && !iphoff && 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);
+	}
+
+	/* Proto    Max log string length */
+	/* IP:      40+46+6+11+127 = 230 */
+	/* TCP:     10+max(25,20+30+13+9+32+11+127) = 252 */
+	/* UDP:     10+max(25,20) = 35 */
+	/* ICMP:    11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */
+	/* ESP:     10+max(25)+15 = 50 */
+	/* AH:      9+max(25)+15 = 49 */
+	/* unknown: 10 */
+
+	/* (ICMP allows recursion one level deep) */
+	/* maxlen =  IP + ICMP +  IP + max(TCP,UDP,ICMP,unknown) */
+	/* maxlen = 230+   91  + 230 + 252 = 803 */
+}
+
+static void
+ipt_log_packet(unsigned int hooknum,
+	       const struct sk_buff *skb,
+	       const struct net_device *in,
+	       const struct net_device *out,
+	       const struct ipt_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 : "");
+#ifdef CONFIG_BRIDGE_NETFILTER
+	if (skb->nf_bridge) {
+		struct net_device *physindev = skb->nf_bridge->physindev;
+		struct net_device *physoutdev = skb->nf_bridge->physoutdev;
+
+		if (physindev && in != physindev)
+			printk("PHYSIN=%s ", physindev->name);
+		if (physoutdev && out != physoutdev)
+			printk("PHYSOUT=%s ", physoutdev->name);
+	}
+#endif
+
+	if (in && !out) {
+		/* MAC logging for input chain only. */
+		printk("MAC=");
+		if (skb->dev && skb->dev->hard_header_len
+		    && skb->mac.raw != (void*)skb->nh.iph) {
+			int i;
+			unsigned char *p = skb->mac.raw;
+			for (i = 0; i < skb->dev->hard_header_len; i++,p++)
+				printk("%02x%c", *p,
+				       i==skb->dev->hard_header_len - 1
+				       ? ' ':':');
+		} else
+			printk(" ");
+	}
+
+	dump_packet(loginfo, skb, 0);
+	printk("\n");
+	spin_unlock_bh(&log_lock);
+}
+
+static unsigned int
+ipt_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 ipt_log_info *loginfo = targinfo;
+	char level_string[4] = "< >";
+
+	level_string[1] = '0' + (loginfo->level % 8);
+	ipt_log_packet(hooknum, *pskb, in, out, loginfo, level_string, NULL);
+
+	return IPT_CONTINUE;
+}
+
+static void
+ipt_logfn(unsigned int hooknum,
+	  const struct sk_buff *skb,
+	  const struct net_device *in,
+	  const struct net_device *out,
+	  const char *prefix)
+{
+	struct ipt_log_info loginfo = { 
+		.level = 0, 
+		.logflags = IPT_LOG_MASK, 
+		.prefix = "" 
+	};
+
+	ipt_log_packet(hooknum, skb, in, out, &loginfo, KERN_WARNING, prefix);
+}
+
+static int ipt_log_checkentry(const char *tablename,
+			      const struct ipt_entry *e,
+			      void *targinfo,
+			      unsigned int targinfosize,
+			      unsigned int hook_mask)
+{
+	const struct ipt_log_info *loginfo = targinfo;
+
+	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_log_info))) {
+		DEBUGP("LOG: targinfosize %u != %u\n",
+		       targinfosize, IPT_ALIGN(sizeof(struct ipt_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 ipt_target ipt_log_reg = {
+	.name		= "LOG",
+	.target		= ipt_log_target,
+	.checkentry	= ipt_log_checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	if (ipt_register_target(&ipt_log_reg))
+		return -EINVAL;
+	if (nflog)
+		nf_log_register(PF_INET, &ipt_logfn);
+	
+	return 0;
+}
+
+static void __exit fini(void)
+{
+	if (nflog)
+		nf_log_unregister(PF_INET, &ipt_logfn);
+	ipt_unregister_target(&ipt_log_reg);
+}
+
+module_init(init);
+module_exit(fini);