openwrt/target/linux/ar71xx/patches-3.6/902-unaligned_access_hacks.patch

--- a/arch/mips/include/asm/checksum.h
+++ b/arch/mips/include/asm/checksum.h
@@ -12,6 +12,7 @@
 #define _ASM_CHECKSUM_H
 
 #include <linux/in6.h>
+#include <linux/unaligned/packed_struct.h>
 
 #include <asm/uaccess.h>
 
@@ -104,26 +105,30 @@ static inline __sum16 ip_fast_csum(const
 	const unsigned int *stop = word + ihl;
 	unsigned int csum;
 	int carry;
+	unsigned int w;
 
-	csum = word[0];
-	csum += word[1];
-	carry = (csum < word[1]);
+	csum = __get_unaligned_cpu32(word++);
+
+	w = __get_unaligned_cpu32(word++);
+	csum += w;
+	carry = (csum < w);
 	csum += carry;
 
-	csum += word[2];
-	carry = (csum < word[2]);
+	w = __get_unaligned_cpu32(word++);
+	csum += w;
+	carry = (csum < w);
 	csum += carry;
 
-	csum += word[3];
-	carry = (csum < word[3]);
+	w = __get_unaligned_cpu32(word++);
+	csum += w;
+	carry = (csum < w);
 	csum += carry;
 
-	word += 4;
 	do {
-		csum += *word;
-		carry = (csum < *word);
+		w = __get_unaligned_cpu32(word++);
+		csum += w;
+		carry = (csum < w);
 		csum += carry;
-		word++;
 	} while (word != stop);
 
 	return csum_fold(csum);
--- a/include/linux/ip.h
+++ b/include/linux/ip.h
@@ -102,7 +102,7 @@ struct iphdr {
 	__be32	saddr;
 	__be32	daddr;
 	/*The options start here. */
-};
+} __packed;
 
 #ifdef __KERNEL__
 #include <linux/skbuff.h>
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -126,7 +126,7 @@ struct ipv6hdr {
 
 	struct	in6_addr	saddr;
 	struct	in6_addr	daddr;
-};
+} __packed;
 
 #ifdef __KERNEL__
 /*
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -54,7 +54,7 @@ struct tcphdr {
 	__be16	window;
 	__sum16	check;
 	__be16	urg_ptr;
-};
+} __packed;
 
 /*
  *	The union cast uses a gcc extension to avoid aliasing problems
--- a/include/linux/udp.h
+++ b/include/linux/udp.h
@@ -24,7 +24,7 @@ struct udphdr {
 	__be16	dest;
 	__be16	len;
 	__sum16	check;
-};
+} __packed;
 
 /* UDP socket options */
 #define UDP_CORK	1	/* Never send partially complete segments */
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -14,6 +14,7 @@
 #include <linux/skbuff.h>
 #include <linux/icmp.h>
 #include <linux/sysctl.h>
+#include <linux/unaligned/packed_struct.h>
 #include <net/route.h>
 #include <net/ip.h>
 
@@ -44,8 +45,8 @@ static bool ipv4_pkt_to_tuple(const stru
 	if (ap == NULL)
 		return false;
 
-	tuple->src.u3.ip = ap[0];
-	tuple->dst.u3.ip = ap[1];
+	tuple->src.u3.ip = __get_unaligned_cpu32(ap++);
+	tuple->dst.u3.ip = __get_unaligned_cpu32(ap);
 
 	return true;
 }