[PATCH 2.4] iptables AH/ESP fix (1/1)

[PATCH 2.4] iptables AH/ESP fix (1/1)

[Harald Welte]

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Hi Davem!

The below patch (again by Patrick McHardy) is the 2.4 merge of the last
3 2.6 patches I've sent you.  Obviously we cannot use the kernel's
ah/esp structures, since there are none.

Please apply, thanks.

diff -Nru a/net/ipv4/netfilter/ipt_LOG.c b/net/ipv4/netfilter/ipt_LOG.c
--- a/net/ipv4/netfilter/ipt_LOG.c	Mon Jul 21 02:21:23 2003
+++ b/net/ipv4/netfilter/ipt_LOG.c	Mon Jul 21 02:21:23 2003
@@ -3,15 +3,14 @@
  */
 #include <linux/module.h>
 #include <linux/skbuff.h>
-#include <linux/ip.h>
 #include <linux/spinlock.h>
+#include <linux/ip.h>
 #include <net/icmp.h>
 #include <net/udp.h>
 #include <net/tcp.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
-
-struct in_device;
 #include <net/route.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
 #include <linux/netfilter_ipv4/ipt_LOG.h>
 
 #if 0
@@ -20,10 +19,20 @@
 #define DEBUGP(format, args...)
 #endif
 
+/* FIXME: move to ip.h like in 2.5 */
+struct ahhdr {
+	__u8    nexthdr;
+	__u8    hdrlen;
+	__u16   reserved;
+	__u32   spi;
+	__u32   seq_no;
+};
+
 struct esphdr {
 	__u32   spi;
-}; /* FIXME evil kludge */
-        
+	__u32   seq_no;
+};
+
 /* Use lock to serialize, so printks don't overlap */
 static spinlock_t log_lock = SPIN_LOCK_UNLOCKED;
 
@@ -58,7 +67,8 @@
 		printk("FRAG:%u ", ntohs(iph->frag_off) & IP_OFFSET);
 
 	if ((info->logflags & IPT_LOG_IPOPT)
-	    && iph->ihl * 4 != sizeof(struct iphdr)) {
+	    && iph->ihl * 4 != sizeof(struct iphdr)
+	    && iph->ihl * 4 >= datalen) {
 		unsigned int i;
 
 		/* Max length: 127 "OPT (" 15*4*2chars ") " */
@@ -231,13 +241,30 @@
 		break;
 	}
 	/* Max Length */
-	case IPPROTO_AH:
+	case IPPROTO_AH: {
+		struct ahhdr *ah = protoh;
+
+		/* Max length: 9 "PROTO=AH " */
+		printk("PROTO=AH ");
+
+		if (ntohs(iph->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		if (datalen < sizeof (*ah)) {
+			printk("INCOMPLETE [%u bytes] ", datalen);
+			break;
+		}
+
+		/* Length: 15 "SPI=0xF1234567 " */
+		printk("SPI=0x%x ", ntohl(ah->spi) );
+		break;
+	}
 	case IPPROTO_ESP: {
 		struct esphdr *esph = protoh;
-		int esp= (iph->protocol==IPPROTO_ESP);
 
 		/* Max length: 10 "PROTO=ESP " */
-		printk("PROTO=%s ",esp? "ESP" : "AH");
+		printk("PROTO=ESP ");
 
 		if (ntohs(iph->frag_off) & IP_OFFSET)
 			break;
diff -Nru a/net/ipv4/netfilter/ipt_ah.c b/net/ipv4/netfilter/ipt_ah.c
--- a/net/ipv4/netfilter/ipt_ah.c	Mon Jul 21 02:20:52 2003
+++ b/net/ipv4/netfilter/ipt_ah.c	Mon Jul 21 02:20:52 2003
@@ -15,7 +15,11 @@
 #endif
 
 struct ahhdr {
+	__u8    nexthdr;
+	__u8    hdrlen;
+	__u16   reserved;
 	__u32   spi;
+	__u32   seq_no;
 };
 
 /* Returns 1 if the spi is matched by the range, 0 otherwise */
diff -Nru a/net/ipv4/netfilter/ipt_esp.c b/net/ipv4/netfilter/ipt_esp.c
--- a/net/ipv4/netfilter/ipt_esp.c	Mon Jul 21 02:22:20 2003
+++ b/net/ipv4/netfilter/ipt_esp.c	Mon Jul 21 02:22:20 2003
@@ -16,6 +16,7 @@
 
 struct esphdr {
 	__u32   spi;
+	__u32   seq_no;
 };
 
 /* Returns 1 if the spi is matched by the range, 0 otherwise */
-- 
- Harald Welte <laforge@netfilter.org>             http://www.netfilter.org/
============================================================================
  "Fragmentation is like classful addressing -- an interesting early
   architectural error that shows how much experimentation was going
   on while IP was being designed."                    -- Paul Vixie

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