freifunkist-firmware/target/linux/ar71xx/patches-3.7/902-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/uapi/linux/ip.h
+++ b/include/uapi/linux/ip.h
@@ -102,7 +102,7 @@ struct iphdr {
 	__be32	saddr;
 	__be32	daddr;
 	/*The options start here. */
-};
+} __attribute__((packed, aligned(2)));
 
 
 struct ip_auth_hdr {
--- a/include/uapi/linux/ipv6.h
+++ b/include/uapi/linux/ipv6.h
@@ -123,7 +123,7 @@ struct ipv6hdr {
 
 	struct	in6_addr	saddr;
 	struct	in6_addr	daddr;
-};
+} __attribute__((packed, aligned(2)));
 
 
 /* index values for the variables in ipv6_devconf */
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -54,7 +54,7 @@ struct tcphdr {
 	__be16	window;
 	__sum16	check;
 	__be16	urg_ptr;
-};
+} __attribute__((packed, aligned(2)));
 
 /*
  *	The union cast uses a gcc extension to avoid aliasing problems
@@ -64,7 +64,7 @@ struct tcphdr {
 union tcp_word_hdr { 
 	struct tcphdr hdr;
 	__be32 		  words[5];
-}; 
+} __attribute__((packed, aligned(2)));
 
 #define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3]) 
 
--- a/include/uapi/linux/udp.h
+++ b/include/uapi/linux/udp.h
@@ -24,7 +24,7 @@ struct udphdr {
 	__be16	dest;
 	__be16	len;
 	__sum16	check;
-};
+} __attribute__((packed, aligned(2)));
 
 /* 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>
 
@@ -39,8 +40,8 @@ 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;
 }
--- a/include/uapi/linux/icmp.h
+++ b/include/uapi/linux/icmp.h
@@ -80,7 +80,7 @@ struct icmphdr {
 		__be16	mtu;
 	} frag;
   } un;
-};
+} __attribute__((packed, aligned(2)));
 
 
 /*
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3842,13 +3842,14 @@ static bool tcp_parse_aligned_timestamp(
 {
 	const __be32 *ptr = (const __be32 *)(th + 1);
 
-	if (*ptr == htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16)
-			  | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP)) {
+	if (__get_unaligned_cpu32(ptr) ==
+	    htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
+	    (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP)) {
 		tp->rx_opt.saw_tstamp = 1;
 		++ptr;
-		tp->rx_opt.rcv_tsval = ntohl(*ptr);
+		tp->rx_opt.rcv_tsval = get_unaligned_be32(ptr);
 		++ptr;
-		tp->rx_opt.rcv_tsecr = ntohl(*ptr);
+		tp->rx_opt.rcv_tsecr = get_unaligned_be32(ptr);
 		return true;
 	}
 	return false;
--- a/include/uapi/linux/in6.h
+++ b/include/uapi/linux/in6.h
@@ -36,7 +36,7 @@ struct in6_addr {
 #define s6_addr			in6_u.u6_addr8
 #define s6_addr16		in6_u.u6_addr16
 #define s6_addr32		in6_u.u6_addr32
-};
+} __attribute__((packed, aligned(2)));
 
 /* IPv6 Wildcard Address (::) and Loopback Address (::1) defined in RFC2553
  * NOTE: Be aware the IN6ADDR_* constants and in6addr_* externals are defined
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -61,6 +61,7 @@
 #endif
 
 #include <asm/uaccess.h>
+#include <asm/unaligned.h>
 #include <linux/mroute6.h>
 
 MODULE_AUTHOR("Cast of dozens");
@@ -880,7 +881,8 @@ static struct sk_buff **ipv6_gro_receive
 			continue;
 
 		iph2 = ipv6_hdr(p);
-		first_word = *(__be32 *)iph ^ *(__be32 *)iph2 ;
+		first_word = __get_unaligned_cpu32((__u32 *) iph) ^
+			     __get_unaligned_cpu32((__u32 *) iph2);
 
 		/* All fields must match except length and Traffic Class. */
 		if (nlen != skb_network_header_len(p) ||