openwrt/target/linux/ar71xx/patches-4.9/910-unaligned_access_hacks.patch

--- a/arch/mips/include/asm/checksum.h
+++ b/arch/mips/include/asm/checksum.h
@@ -134,26 +134,30 @@ 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 = net_hdr_word(word++);
+
+	w = net_hdr_word(word++);
+	csum += w;
+	carry = (csum < w);
 	csum += carry;
 
-	csum += word[2];
-	carry = (csum < word[2]);
+	w = net_hdr_word(word++);
+	csum += w;
+	carry = (csum < w);
 	csum += carry;
 
-	csum += word[3];
-	carry = (csum < word[3]);
+	w = net_hdr_word(word++);
+	csum += w;
+	carry = (csum < w);
 	csum += carry;
 
-	word += 4;
 	do {
-		csum += *word;
-		carry = (csum < *word);
+		w = net_hdr_word(word++);
+		csum += w;
+		carry = (csum < w);
 		csum += carry;
-		word++;
 	} while (word != stop);
 
 	return csum_fold(csum);
@@ -214,73 +218,6 @@ static inline __sum16 ip_compute_csum(co
 	return csum_fold(csum_partial(buff, len, 0));
 }
 
-#define _HAVE_ARCH_IPV6_CSUM
-static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
-					  const struct in6_addr *daddr,
-					  __u32 len, __u8 proto,
-					  __wsum sum)
-{
-	__wsum tmp;
-
-	__asm__(
-	"	.set	push		# csum_ipv6_magic\n"
-	"	.set	noreorder	\n"
-	"	.set	noat		\n"
-	"	addu	%0, %5		# proto (long in network byte order)\n"
-	"	sltu	$1, %0, %5	\n"
-	"	addu	%0, $1		\n"
-
-	"	addu	%0, %6		# csum\n"
-	"	sltu	$1, %0, %6	\n"
-	"	lw	%1, 0(%2)	# four words source address\n"
-	"	addu	%0, $1		\n"
-	"	addu	%0, %1		\n"
-	"	sltu	$1, %0, %1	\n"
-
-	"	lw	%1, 4(%2)	\n"
-	"	addu	%0, $1		\n"
-	"	addu	%0, %1		\n"
-	"	sltu	$1, %0, %1	\n"
-
-	"	lw	%1, 8(%2)	\n"
-	"	addu	%0, $1		\n"
-	"	addu	%0, %1		\n"
-	"	sltu	$1, %0, %1	\n"
-
-	"	lw	%1, 12(%2)	\n"
-	"	addu	%0, $1		\n"
-	"	addu	%0, %1		\n"
-	"	sltu	$1, %0, %1	\n"
-
-	"	lw	%1, 0(%3)	\n"
-	"	addu	%0, $1		\n"
-	"	addu	%0, %1		\n"
-	"	sltu	$1, %0, %1	\n"
-
-	"	lw	%1, 4(%3)	\n"
-	"	addu	%0, $1		\n"
-	"	addu	%0, %1		\n"
-	"	sltu	$1, %0, %1	\n"
-
-	"	lw	%1, 8(%3)	\n"
-	"	addu	%0, $1		\n"
-	"	addu	%0, %1		\n"
-	"	sltu	$1, %0, %1	\n"
-
-	"	lw	%1, 12(%3)	\n"
-	"	addu	%0, $1		\n"
-	"	addu	%0, %1		\n"
-	"	sltu	$1, %0, %1	\n"
-
-	"	addu	%0, $1		# Add final carry\n"
-	"	.set	pop"
-	: "=&r" (sum), "=&r" (tmp)
-	: "r" (saddr), "r" (daddr),
-	  "0" (htonl(len)), "r" (htonl(proto)), "r" (sum));
-
-	return csum_fold(sum);
-}
-
 #include <asm-generic/checksum.h>
 #endif /* CONFIG_GENERIC_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
@@ -129,7 +129,7 @@ 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
@@ -41,8 +41,8 @@ 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 = net_hdr_word(ap++);
+	tuple->dst.u3.ip = net_hdr_word(ap);
 
 	return true;
 }
--- a/include/uapi/linux/icmp.h
+++ b/include/uapi/linux/icmp.h
@@ -81,7 +81,7 @@ struct icmphdr {
 	} frag;
 	__u8	reserved[4];
   } un;
-};
+} __attribute__((packed, aligned(2)));
 
 
 /*
--- a/include/uapi/linux/in6.h
+++ b/include/uapi/linux/in6.h
@@ -42,7 +42,7 @@ struct in6_addr {
 #define s6_addr16		in6_u.u6_addr16
 #define s6_addr32		in6_u.u6_addr32
 #endif
-};
+} __attribute__((packed, aligned(2)));
 #endif /* __UAPI_DEF_IN6_ADDR */
 
 #if __UAPI_DEF_SOCKADDR_IN6
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -39,6 +39,7 @@
 #include <linux/ipsec.h>
 #include <linux/times.h>
 #include <linux/slab.h>
+#include <asm/unaligned.h>
 #include <linux/uaccess.h>
 #include <linux/ipv6.h>
 #include <linux/icmpv6.h>
@@ -796,10 +797,10 @@ static void tcp_v6_send_response(const s
 	topt = (__be32 *)(t1 + 1);
 
 	if (tsecr) {
-		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
-				(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
-		*topt++ = htonl(tsval);
-		*topt++ = htonl(tsecr);
+		put_unaligned_be32((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
+				(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP, topt++);
+		put_unaligned_be32(tsval, topt++);
+		put_unaligned_be32(tsecr, topt++);
 	}
 
 #ifdef CONFIG_TCP_MD5SIG
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -5,6 +5,7 @@
 
 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
 #define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
+
 /*
  * This structure contains configuration options per IPv6 link.
  */
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -471,7 +471,7 @@ int ipv6_recv_error(struct sock *sk, str
 				ipv6_iface_scope_id(&sin->sin6_addr,
 						    IP6CB(skb)->iif);
 		} else {
-			ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
+			ipv6_addr_set_v4mapped(net_hdr_word(nh + serr->addr_offset),
 					       &sin->sin6_addr);
 			sin->sin6_scope_id = 0;
 		}
@@ -814,12 +814,12 @@ int ip6_datagram_send_ctl(struct net *ne
 			}
 
 			if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
-				if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
+				if ((fl6->flowlabel^net_hdr_word(CMSG_DATA(cmsg)))&~IPV6_FLOWINFO_MASK) {
 					err = -EINVAL;
 					goto exit_f;
 				}
 			}
-			fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
+			fl6->flowlabel = IPV6_FLOWINFO_MASK & net_hdr_word(CMSG_DATA(cmsg));
 			break;
 
 		case IPV6_2292HOPOPTS:
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -395,7 +395,7 @@ static void ip6gre_err(struct sk_buff *s
 		return;
 	ipv6h = (const struct ipv6hdr *)skb->data;
 	greh = (const struct gre_base_hdr *)(skb->data + offset);
-	key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
+	key = key_off ? net_hdr_word((__be32 *)(skb->data + key_off)) : 0;
 
 	t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
 				 key, greh->protocol);
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -574,7 +574,7 @@ static bool ipv6_hop_jumbo(struct sk_buf
 		goto drop;
 	}
 
-	pkt_len = ntohl(*(__be32 *)(nh + optoff + 2));
+	pkt_len = ntohl(net_hdr_word(nh + optoff + 2));
 	if (pkt_len <= IPV6_MAXPLEN) {
 		__IP6_INC_STATS(net, ipv6_skb_idev(skb),
 				IPSTATS_MIB_INHDRERRORS);
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -231,5 +231,11 @@ typedef void (*call_rcu_func_t)(struct r
 /* clocksource cycle base type */
 typedef u64 cycle_t;
 
+struct net_hdr_word {
+       u32 words[1];
+} __attribute__((packed, aligned(2)));
+
+#define net_hdr_word(_p) (((struct net_hdr_word *) (_p))->words[0])
+
 #endif /*  __ASSEMBLY__ */
 #endif /* _LINUX_TYPES_H */
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1318,8 +1318,8 @@ struct sk_buff **inet_gro_receive(struct
 	if (unlikely(ip_fast_csum((u8 *)iph, 5)))
 		goto out_unlock;
 
-	id = ntohl(*(__be32 *)&iph->id);
-	flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
+	id = ntohl(net_hdr_word(&iph->id));
+	flush = (u16)((ntohl(net_hdr_word(iph)) ^ skb_gro_len(skb)) | (id & ~IP_DF));
 	id >>= 16;
 
 	for (p = *head; p; p = p->next) {
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -458,7 +458,7 @@ static struct neighbour *ipv4_neigh_look
 	else if (skb)
 		pkey = &ip_hdr(skb)->daddr;
 
-	n = __ipv4_neigh_lookup(dev, *(__force u32 *)pkey);
+	n = __ipv4_neigh_lookup(dev, net_hdr_word(pkey));
 	if (n)
 		return n;
 	return neigh_create(&arp_tbl, pkey, dev);
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -448,48 +448,53 @@ static void tcp_options_write(__be32 *pt
 	u16 options = opts->options;	/* mungable copy */
 
 	if (unlikely(OPTION_MD5 & options)) {
-		*ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
-			       (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
+		net_hdr_word(ptr++) =
+			htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
+			      (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
 		/* overload cookie hash location */
 		opts->hash_location = (__u8 *)ptr;
 		ptr += 4;
 	}
 
 	if (unlikely(opts->mss)) {
-		*ptr++ = htonl((TCPOPT_MSS << 24) |
-			       (TCPOLEN_MSS << 16) |
-			       opts->mss);
+		net_hdr_word(ptr++) =
+			htonl((TCPOPT_MSS << 24) | (TCPOLEN_MSS << 16) |
+			      opts->mss);
 	}
 
 	if (likely(OPTION_TS & options)) {
 		if (unlikely(OPTION_SACK_ADVERTISE & options)) {
-			*ptr++ = htonl((TCPOPT_SACK_PERM << 24) |
-				       (TCPOLEN_SACK_PERM << 16) |
-				       (TCPOPT_TIMESTAMP << 8) |
-				       TCPOLEN_TIMESTAMP);
+			net_hdr_word(ptr++) =
+				htonl((TCPOPT_SACK_PERM << 24) |
+				      (TCPOLEN_SACK_PERM << 16) |
+				      (TCPOPT_TIMESTAMP << 8) |
+				      TCPOLEN_TIMESTAMP);
 			options &= ~OPTION_SACK_ADVERTISE;
 		} else {
-			*ptr++ = htonl((TCPOPT_NOP << 24) |
-				       (TCPOPT_NOP << 16) |
-				       (TCPOPT_TIMESTAMP << 8) |
-				       TCPOLEN_TIMESTAMP);
+			net_hdr_word(ptr++) =
+				htonl((TCPOPT_NOP << 24) |
+				      (TCPOPT_NOP << 16) |
+				      (TCPOPT_TIMESTAMP << 8) |
+				      TCPOLEN_TIMESTAMP);
 		}
-		*ptr++ = htonl(opts->tsval);
-		*ptr++ = htonl(opts->tsecr);
+		net_hdr_word(ptr++) = htonl(opts->tsval);
+		net_hdr_word(ptr++) = htonl(opts->tsecr);
 	}
 
 	if (unlikely(OPTION_SACK_ADVERTISE & options)) {
-		*ptr++ = htonl((TCPOPT_NOP << 24) |
-			       (TCPOPT_NOP << 16) |
-			       (TCPOPT_SACK_PERM << 8) |
-			       TCPOLEN_SACK_PERM);
+		net_hdr_word(ptr++) =
+			htonl((TCPOPT_NOP << 24) |
+			      (TCPOPT_NOP << 16) |
+			      (TCPOPT_SACK_PERM << 8) |
+			      TCPOLEN_SACK_PERM);
 	}
 
 	if (unlikely(OPTION_WSCALE & options)) {
-		*ptr++ = htonl((TCPOPT_NOP << 24) |
-			       (TCPOPT_WINDOW << 16) |
-			       (TCPOLEN_WINDOW << 8) |
-			       opts->ws);
+		net_hdr_word(ptr++) =
+			htonl((TCPOPT_NOP << 24) |
+			      (TCPOPT_WINDOW << 16) |
+			      (TCPOLEN_WINDOW << 8) |
+			      opts->ws);
 	}
 
 	if (unlikely(opts->num_sack_blocks)) {
@@ -497,16 +502,17 @@ static void tcp_options_write(__be32 *pt
 			tp->duplicate_sack : tp->selective_acks;
 		int this_sack;
 
-		*ptr++ = htonl((TCPOPT_NOP  << 24) |
-			       (TCPOPT_NOP  << 16) |
-			       (TCPOPT_SACK <<  8) |
-			       (TCPOLEN_SACK_BASE + (opts->num_sack_blocks *
+		net_hdr_word(ptr++) =
+			htonl((TCPOPT_NOP << 24) |
+			      (TCPOPT_NOP << 16) |
+			      (TCPOPT_SACK << 8) |
+			      (TCPOLEN_SACK_BASE + (opts->num_sack_blocks *
 						     TCPOLEN_SACK_PERBLOCK)));
 
 		for (this_sack = 0; this_sack < opts->num_sack_blocks;
 		     ++this_sack) {
-			*ptr++ = htonl(sp[this_sack].start_seq);
-			*ptr++ = htonl(sp[this_sack].end_seq);
+			net_hdr_word(ptr++) = htonl(sp[this_sack].start_seq);
+			net_hdr_word(ptr++) = htonl(sp[this_sack].end_seq);
 		}
 
 		tp->rx_opt.dsack = 0;
@@ -519,13 +525,14 @@ static void tcp_options_write(__be32 *pt
 
 		if (foc->exp) {
 			len = TCPOLEN_EXP_FASTOPEN_BASE + foc->len;
-			*ptr = htonl((TCPOPT_EXP << 24) | (len << 16) |
+			net_hdr_word(ptr) =
+				htonl((TCPOPT_EXP << 24) | (len << 16) |
 				     TCPOPT_FASTOPEN_MAGIC);
 			p += TCPOLEN_EXP_FASTOPEN_BASE;
 		} else {
 			len = TCPOLEN_FASTOPEN_BASE + foc->len;
-			*p++ = TCPOPT_FASTOPEN;
-			*p++ = len;
+			net_hdr_word(p++) = TCPOPT_FASTOPEN;
+			net_hdr_word(p++) = len;
 		}
 
 		memcpy(p, foc->val, foc->len);
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -537,7 +537,7 @@ static struct sk_buff *add_grec(struct s
 		if (!skb)
 			return NULL;
 		psrc = (__be32 *)skb_put(skb, sizeof(__be32));
-		*psrc = psf->sf_inaddr;
+		net_hdr_word(psrc) = psf->sf_inaddr;
 		scount++; stotal++;
 		if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 		     type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
--- a/include/uapi/linux/igmp.h
+++ b/include/uapi/linux/igmp.h
@@ -32,7 +32,7 @@ struct igmphdr {
 	__u8 code;		/* For newer IGMP */
 	__sum16 csum;
 	__be32 group;
-};
+} __attribute__((packed, aligned(2)));
 
 /* V3 group record types [grec_type] */
 #define IGMPV3_MODE_IS_INCLUDE		1
@@ -48,7 +48,7 @@ struct igmpv3_grec {
 	__be16	grec_nsrcs;
 	__be32	grec_mca;
 	__be32	grec_src[0];
-};
+} __attribute__((packed, aligned(2)));
 
 struct igmpv3_report {
 	__u8 type;
@@ -57,7 +57,7 @@ struct igmpv3_report {
 	__be16 resv2;
 	__be16 ngrec;
 	struct igmpv3_grec grec[0];
-};
+} __attribute__((packed, aligned(2)));
 
 struct igmpv3_query {
 	__u8 type;
@@ -78,7 +78,7 @@ struct igmpv3_query {
 	__u8 qqic;
 	__be16 nsrcs;
 	__be32 srcs[0];
-};
+} __attribute__((packed, aligned(2)));
 
 #define IGMP_HOST_MEMBERSHIP_QUERY	0x11	/* From RFC1112 */
 #define IGMP_HOST_MEMBERSHIP_REPORT	0x12	/* Ditto */
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -84,7 +84,7 @@ __be32 __skb_flow_get_ports(const struct
 		ports = __skb_header_pointer(skb, thoff + poff,
 					     sizeof(_ports), data, hlen, &_ports);
 		if (ports)
-			return *ports;
+			return (__be32)net_hdr_word(ports);
 	}
 
 	return 0;
--- a/include/uapi/linux/icmpv6.h
+++ b/include/uapi/linux/icmpv6.h
@@ -76,7 +76,7 @@ struct icmp6hdr {
 #define icmp6_addrconf_other	icmp6_dataun.u_nd_ra.other
 #define icmp6_rt_lifetime	icmp6_dataun.u_nd_ra.rt_lifetime
 #define icmp6_router_pref	icmp6_dataun.u_nd_ra.router_pref
-};
+} __attribute__((packed, aligned(2)));
 
 
 #define ICMPV6_ROUTER_PREF_LOW		0x3
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -87,7 +87,7 @@ struct ra_msg {
         struct icmp6hdr		icmph;
 	__be32			reachable_time;
 	__be32			retrans_timer;
-};
+} __attribute__((packed, aligned(2)));
 
 struct rd_msg {
 	struct icmp6hdr icmph;
@@ -365,10 +365,10 @@ static inline u32 ndisc_hashfn(const voi
 {
 	const u32 *p32 = pkey;
 
-	return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
-		(p32[1] * hash_rnd[1]) +
-		(p32[2] * hash_rnd[2]) +
-		(p32[3] * hash_rnd[3]));
+	return (((net_hdr_word(&p32[0]) ^ hash32_ptr(dev)) * hash_rnd[0]) +
+		(net_hdr_word(&p32[1]) * hash_rnd[1]) +
+		(net_hdr_word(&p32[2]) * hash_rnd[2]) +
+		(net_hdr_word(&p32[3]) * hash_rnd[3]));
 }
 
 static inline struct neighbour *__ipv6_neigh_lookup_noref(struct net_device *dev, const void *pkey)
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -159,7 +159,7 @@ next_knode:
 			data = skb_header_pointer(skb, toff, 4, &hdata);
 			if (!data)
 				goto out;
-			if ((*data ^ key->val) & key->mask) {
+			if ((net_hdr_word(data) ^ key->val) & key->mask) {
 				n = rcu_dereference_bh(n->next);
 				goto next_knode;
 			}
@@ -212,8 +212,8 @@ check_terminal:
 						  &hdata);
 			if (!data)
 				goto out;
-			sel = ht->divisor & u32_hash_fold(*data, &n->sel,
-							  n->fshift);
+			sel = ht->divisor & u32_hash_fold(net_hdr_word(data),
+							  &n->sel, n->fshift);
 		}
 		if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
 			goto next_ht;
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -220,7 +220,7 @@ static struct sk_buff **ipv6_gro_receive
 			continue;
 
 		iph2 = (struct ipv6hdr *)(p->data + off);
-		first_word = *(__be32 *)iph ^ *(__be32 *)iph2;
+		first_word = net_hdr_word(iph) ^ net_hdr_word(iph2);
 
 		/* All fields must match except length and Traffic Class.
 		 * XXX skbs on the gro_list have all been parsed and pulled
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -46,7 +46,7 @@ struct prefix_info {
 	__be32			reserved2;
 
 	struct in6_addr		prefix;
-};
+} __attribute__((packed, aligned(2)));
 
 
 #include <linux/netdevice.h>
--- a/include/net/inet_ecn.h
+++ b/include/net/inet_ecn.h
@@ -124,9 +124,9 @@ static inline int IP6_ECN_set_ce(struct
 	if (INET_ECN_is_not_ect(ipv6_get_dsfield(iph)))
 		return 0;
 
-	from = *(__be32 *)iph;
+	from = net_hdr_word(iph);
 	to = from | htonl(INET_ECN_CE << 20);
-	*(__be32 *)iph = to;
+	net_hdr_word(iph) = to;
 	if (skb->ip_summed == CHECKSUM_COMPLETE)
 		skb->csum = csum_add(csum_sub(skb->csum, (__force __wsum)from),
 				     (__force __wsum)to);
@@ -135,7 +135,7 @@ static inline int IP6_ECN_set_ce(struct
 
 static inline void IP6_ECN_clear(struct ipv6hdr *iph)
 {
-	*(__be32*)iph &= ~htonl(INET_ECN_MASK << 20);
+	net_hdr_word(iph) &= ~htonl(INET_ECN_MASK << 20);
 }
 
 static inline void ipv6_copy_dscp(unsigned int dscp, struct ipv6hdr *inner)
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -107,7 +107,7 @@ struct frag_hdr {
 	__u8	reserved;
 	__be16	frag_off;
 	__be32	identification;
-};
+} __attribute__((packed, aligned(2)));
 
 #define	IP6_MF		0x0001
 #define	IP6_OFFSET	0xFFF8
@@ -450,8 +450,8 @@ static inline void __ipv6_addr_set_half(
 	}
 #endif
 #endif
-	addr[0] = wh;
-	addr[1] = wl;
+	net_hdr_word(&addr[0]) = wh;
+	net_hdr_word(&addr[1]) = wl;
 }
 
 static inline void ipv6_addr_set(struct in6_addr *addr, 
@@ -510,6 +510,8 @@ static inline bool ipv6_prefix_equal(con
 	const __be32 *a1 = addr1->s6_addr32;
 	const __be32 *a2 = addr2->s6_addr32;
 	unsigned int pdw, pbi;
+	/* Used for last <32-bit fraction of prefix */
+	u32 pbia1, pbia2;
 
 	/* check complete u32 in prefix */
 	pdw = prefixlen >> 5;
@@ -518,7 +520,9 @@ static inline bool ipv6_prefix_equal(con
 
 	/* check incomplete u32 in prefix */
 	pbi = prefixlen & 0x1f;
-	if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
+	pbia1 = net_hdr_word(&a1[pdw]);
+	pbia2 = net_hdr_word(&a2[pdw]);
+	if (pbi && ((pbia1 ^ pbia2) & htonl((0xffffffff) << (32 - pbi))))
 		return false;
 
 	return true;
@@ -662,13 +666,13 @@ static inline void ipv6_addr_set_v4mappe
  */
 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
 {
-	const __be32 *a1 = token1, *a2 = token2;
+	const struct in6_addr *a1 = token1, *a2 = token2;
 	int i;
 
 	addrlen >>= 2;
 
 	for (i = 0; i < addrlen; i++) {
-		__be32 xb = a1[i] ^ a2[i];
+		__be32 xb = a1->s6_addr32[i] ^ a2->s6_addr32[i];
 		if (xb)
 			return i * 32 + 31 - __fls(ntohl(xb));
 	}
@@ -837,17 +841,18 @@ static inline int ip6_default_np_autolab
 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
 				__be32 flowlabel)
 {
-	*(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
+	net_hdr_word((__be32 *)hdr) =
+		htonl(0x60000000 | (tclass << 20)) | flowlabel;
 }
 
 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
 {
-	return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
+	return net_hdr_word((__be32 *)hdr) & IPV6_FLOWINFO_MASK;
 }
 
 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
 {
-	return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
+	return net_hdr_word((__be32 *)hdr) & IPV6_FLOWLABEL_MASK;
 }
 
 static inline u8 ip6_tclass(__be32 flowinfo)
--- a/include/net/secure_seq.h
+++ b/include/net/secure_seq.h
@@ -2,6 +2,7 @@
 #define _NET_SECURE_SEQ
 
 #include <linux/types.h>
+#include <linux/in6.h>
 
 u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport);
 u32 secure_ipv6_port_ephemeral(const __be32 *saddr, const __be32 *daddr,
--- a/include/uapi/linux/in.h
+++ b/include/uapi/linux/in.h
@@ -83,7 +83,7 @@ enum {
 /* Internet address. */
 struct in_addr {
 	__be32	s_addr;
-};
+} __attribute__((packed, aligned(2)));
 #endif
 
 #define IP_TOS		1
--- a/net/core/secure_seq.c
+++ b/net/core/secure_seq.c
@@ -46,11 +46,12 @@ __u32 secure_tcpv6_sequence_number(const
 	u32 secret[MD5_MESSAGE_BYTES / 4];
 	u32 hash[MD5_DIGEST_WORDS];
 	u32 i;
+	const struct in6_addr *daddr6 = (struct in6_addr *) daddr;
 
 	net_secret_init();
 	memcpy(hash, saddr, 16);
 	for (i = 0; i < 4; i++)
-		secret[i] = net_secret[i] + (__force u32)daddr[i];
+		secret[i] = net_secret[i] + (__force u32)daddr6->s6_addr32[i];
 	secret[4] = net_secret[4] +
 		(((__force u16)sport << 16) + (__force u16)dport);
 	for (i = 5; i < MD5_MESSAGE_BYTES / 4; i++)
@@ -68,11 +69,12 @@ u32 secure_ipv6_port_ephemeral(const __b
 	u32 secret[MD5_MESSAGE_BYTES / 4];
 	u32 hash[MD5_DIGEST_WORDS];
 	u32 i;
+	const struct in6_addr *daddr6 = (struct in6_addr *) daddr;
 
 	net_secret_init();
 	memcpy(hash, saddr, 16);
 	for (i = 0; i < 4; i++)
-		secret[i] = net_secret[i] + (__force u32) daddr[i];
+		secret[i] = net_secret[i] + (__force u32) daddr6->s6_addr32[i];
 	secret[4] = net_secret[4] + (__force u32)dport;
 	for (i = 5; i < MD5_MESSAGE_BYTES / 4; i++)
 		secret[i] = net_secret[i];
@@ -146,6 +148,7 @@ EXPORT_SYMBOL(secure_dccp_sequence_numbe
 u64 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
 				  __be16 sport, __be16 dport)
 {
+	const struct in6_addr *daddr6 = (struct in6_addr *) daddr;
 	u32 secret[MD5_MESSAGE_BYTES / 4];
 	u32 hash[MD5_DIGEST_WORDS];
 	u64 seq;
@@ -154,7 +157,7 @@ u64 secure_dccpv6_sequence_number(__be32
 	net_secret_init();
 	memcpy(hash, saddr, 16);
 	for (i = 0; i < 4; i++)
-		secret[i] = net_secret[i] + (__force u32)daddr[i];
+		secret[i] = net_secret[i] + (__force u32)daddr6->s6_addr32[i];
 	secret[4] = net_secret[4] +
 		(((__force u16)sport << 16) + (__force u16)dport);
 	for (i = 5; i < MD5_MESSAGE_BYTES / 4; i++)
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -136,7 +136,7 @@ static __be32 addr_bit_set(const void *t
 	 * See include/asm-generic/bitops/le.h.
 	 */
 	return (__force __be32)(1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f)) &
-	       addr[fn_bit >> 5];
+	       net_hdr_word(&addr[fn_bit >> 5]);
 }
 
 static struct fib6_node *node_alloc(void)
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -452,7 +452,7 @@ static void tcp_sack(const struct sk_buf
 
 	/* Fast path for timestamp-only option */
 	if (length == TCPOLEN_TSTAMP_ALIGNED
-	    && *(__be32 *)ptr == htonl((TCPOPT_NOP << 24)
+	    && net_hdr_word(ptr) == htonl((TCPOPT_NOP << 24)
 				       | (TCPOPT_NOP << 16)
 				       | (TCPOPT_TIMESTAMP << 8)
 				       | TCPOLEN_TIMESTAMP))
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -154,8 +154,8 @@ int xfrm_parse_spi(struct sk_buff *skb,
 	if (!pskb_may_pull(skb, hlen))
 		return -EINVAL;
 
-	*spi = *(__be32 *)(skb_transport_header(skb) + offset);
-	*seq = *(__be32 *)(skb_transport_header(skb) + offset_seq);
+	*spi = net_hdr_word(skb_transport_header(skb) + offset);
+	*seq = net_hdr_word(skb_transport_header(skb) + offset_seq);
 	return 0;
 }
 
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3892,14 +3892,16 @@ 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 (net_hdr_word(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;
-		if (*ptr)
-			tp->rx_opt.rcv_tsecr = ntohl(*ptr) - tp->tsoffset;
+		if (net_hdr_word(ptr))
+			tp->rx_opt.rcv_tsecr = get_unaligned_be32(ptr) -
+					       tp->tsoffset;
 		else
 			tp->rx_opt.rcv_tsecr = 0;
 		return true;
--- a/include/uapi/linux/if_pppox.h
+++ b/include/uapi/linux/if_pppox.h
@@ -50,6 +50,7 @@ struct pppoe_addr {
  */
 struct pptp_addr {
 	__u16		call_id;
+	__u16		pad;
 	struct in_addr	sin_addr;
 };
 
--- a/net/ipv6/netfilter/nf_log_ipv6.c
+++ b/net/ipv6/netfilter/nf_log_ipv6.c
@@ -66,9 +66,9 @@ static void dump_ipv6_packet(struct nf_l
 	/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
 	nf_log_buf_add(m, "LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
 	       ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
-	       (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20,
+	       (ntohl(net_hdr_word(ih)) & 0x0ff00000) >> 20,
 	       ih->hop_limit,
-	       (ntohl(*(__be32 *)ih) & 0x000fffff));
+	       (ntohl(net_hdr_word(ih)) & 0x000fffff));
 
 	fragment = 0;
 	ptr = ip6hoff + sizeof(struct ipv6hdr);
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -263,8 +263,10 @@ static inline bool neigh_key_eq128(const
 	const u32 *n32 = (const u32 *)n->primary_key;
 	const u32 *p32 = pkey;
 
-	return ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
-		(n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0;
+	return ((n32[0] ^ net_hdr_word(&p32[0])) |
+		(n32[1] ^ net_hdr_word(&p32[1])) |
+		(n32[2] ^ net_hdr_word(&p32[2])) |
+		(n32[3] ^ net_hdr_word(&p32[3]))) == 0;
 }
 
 static inline struct neighbour *___neigh_lookup_noref(
--- a/include/uapi/linux/netfilter_arp/arp_tables.h
+++ b/include/uapi/linux/netfilter_arp/arp_tables.h
@@ -69,7 +69,7 @@ struct arpt_arp {
 	__u8 flags;
 	/* Inverse flags */
 	__u16 invflags;
-};
+} __attribute__((aligned(4)));
 
 /* Values for "flag" field in struct arpt_ip (general arp structure).
  * No flags defined yet.
--- a/net/core/utils.c
+++ b/net/core/utils.c
@@ -321,8 +321,14 @@ void inet_proto_csum_replace16(__sum16 *
 			       bool pseudohdr)
 {
 	__be32 diff[] = {
-		~from[0], ~from[1], ~from[2], ~from[3],
-		to[0], to[1], to[2], to[3],
+		~net_hdr_word(&from[0]),
+		~net_hdr_word(&from[1]),
+		~net_hdr_word(&from[2]),
+		~net_hdr_word(&from[3]),
+		net_hdr_word(&to[0]),
+		net_hdr_word(&to[1]),
+		net_hdr_word(&to[2]),
+		net_hdr_word(&to[3]),
 	};
 	if (skb->ip_summed != CHECKSUM_PARTIAL) {
 		*sum = csum_fold(csum_partial(diff, sizeof(diff),
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1789,15 +1789,15 @@ static int vxlan_build_skb(struct sk_buf
 		goto out_free;
 
 	vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
-	vxh->vx_flags = VXLAN_HF_VNI;
-	vxh->vx_vni = vxlan_vni_field(vni);
+	net_hdr_word(&vxh->vx_flags) = VXLAN_HF_VNI;
+	net_hdr_word(&vxh->vx_vni) = vxlan_vni_field(vni);
 
 	if (type & SKB_GSO_TUNNEL_REMCSUM) {
 		unsigned int start;
 
 		start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
-		vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
-		vxh->vx_flags |= VXLAN_HF_RCO;
+		net_hdr_word(&vxh->vx_vni) |= vxlan_compute_rco(start, skb->csum_offset);
+		net_hdr_word(&vxh->vx_flags) |= VXLAN_HF_RCO;
 
 		if (!skb_is_gso(skb)) {
 			skb->ip_summed = CHECKSUM_NONE;
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -435,7 +435,7 @@ static inline bool is_etherdev_addr(cons
  * @b: Pointer to Ethernet header
  *
  * Compare two Ethernet headers, returns 0 if equal.
- * This assumes that the network header (i.e., IP header) is 4-byte
+ * This assumes that the network header (i.e., IP header) is 2-byte
  * aligned OR the platform can handle unaligned access.  This is the
  * case for all packets coming into netif_receive_skb or similar
  * entry points.
@@ -458,11 +458,12 @@ static inline unsigned long compare_ethe
 	fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6);
 	return fold;
 #else
-	u32 *a32 = (u32 *)((u8 *)a + 2);
-	u32 *b32 = (u32 *)((u8 *)b + 2);
+	const u16 *a16 = a;
+	const u16 *b16 = b;
 
-	return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) |
-	       (a32[1] ^ b32[1]) | (a32[2] ^ b32[2]);
+	return (a16[0] ^ b16[0]) | (a16[1] ^ b16[1]) | (a16[2] ^ b16[2]) |
+	       (a16[3] ^ b16[3]) | (a16[4] ^ b16[4]) | (a16[5] ^ b16[5]) |
+	       (a16[6] ^ b16[6]);
 #endif
 }
 
--- a/net/ipv4/tcp_offload.c
+++ b/net/ipv4/tcp_offload.c
@@ -218,7 +218,7 @@ struct sk_buff **tcp_gro_receive(struct
 
 		th2 = tcp_hdr(p);
 
-		if (*(u32 *)&th->source ^ *(u32 *)&th2->source) {
+		if (net_hdr_word(&th->source) ^ net_hdr_word(&th2->source)) {
 			NAPI_GRO_CB(p)->same_flow = 0;
 			continue;
 		}
@@ -236,8 +236,8 @@ found:
 		  ~(TCP_FLAG_CWR | TCP_FLAG_FIN | TCP_FLAG_PSH));
 	flush |= (__force int)(th->ack_seq ^ th2->ack_seq);
 	for (i = sizeof(*th); i < thlen; i += 4)
-		flush |= *(u32 *)((u8 *)th + i) ^
-			 *(u32 *)((u8 *)th2 + i);
+		flush |= net_hdr_word((u8 *)th + i) ^
+			 net_hdr_word((u8 *)th2 + i);
 
 	/* When we receive our second frame we can made a decision on if we
 	 * continue this flow as an atomic flow with a fixed ID or if we use
--- a/net/ipv6/netfilter/ip6table_mangle.c
+++ b/net/ipv6/netfilter/ip6table_mangle.c
@@ -58,7 +58,7 @@ ip6t_mangle_out(struct sk_buff *skb, con
 	hop_limit = ipv6_hdr(skb)->hop_limit;
 
 	/* flowlabel and prio (includes version, which shouldn't change either */
-	flowlabel = *((u_int32_t *)ipv6_hdr(skb));
+	flowlabel = net_hdr_word(ipv6_hdr(skb));
 
 	ret = ip6t_do_table(skb, state, state->net->ipv6.ip6table_mangle);
 
@@ -67,7 +67,7 @@ ip6t_mangle_out(struct sk_buff *skb, con
 	     !ipv6_addr_equal(&ipv6_hdr(skb)->daddr, &daddr) ||
 	     skb->mark != mark ||
 	     ipv6_hdr(skb)->hop_limit != hop_limit ||
-	     flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) {
+	     flowlabel != net_hdr_word(ipv6_hdr(skb)))) {
 		err = ip6_route_me_harder(state->net, skb);
 		if (err < 0)
 			ret = NF_DROP_ERR(err);