Merge branch 'net-next-2.6-misc-20080612a' of...

Merge branch 'net-next-2.6-misc-20080612a' of git://git.linux-ipv6.org/gitroot/yoshfuji/linux-2.6-next

include/net/addrconf.h

@@ -121,7 +121,8 @@ static inline int addrconf_finite_timeout(unsigned long timeout)
  */
 extern int			ipv6_addr_label_init(void);
 extern void			ipv6_addr_label_rtnl_register(void);
-extern u32			ipv6_addr_label(const struct in6_addr *addr,
+extern u32			ipv6_addr_label(struct net *net,
+						const struct in6_addr *addr,
 						int type, int ifindex);
 
 /*

include/net/if_inet6.h

@@ -148,7 +148,6 @@ struct ifacaddr6
 #define	IFA_HOST	IPV6_ADDR_LOOPBACK
 #define	IFA_LINK	IPV6_ADDR_LINKLOCAL
 #define	IFA_SITE	IPV6_ADDR_SITELOCAL
-#define	IFA_GLOBAL	0x0000U
 
 struct ipv6_devstat {
 	struct proc_dir_entry	*proc_dir_entry;

include/net/tcp.h

@@ -399,6 +399,8 @@ extern void			tcp_parse_options(struct sk_buff *skb,
 						  struct tcp_options_received *opt_rx,
 						  int estab);
 
+extern u8			*tcp_parse_md5sig_option(struct tcphdr *th);
+
 /*
  *	TCP v4 functions exported for the inet6 API
  */
@@ -1115,13 +1117,19 @@ struct tcp_md5sig_pool {
 #define TCP_MD5SIG_MAXKEYS	(~(u32)0)	/* really?! */
 
 /* - functions */
+extern int			tcp_calc_md5_hash(char *md5_hash,
+						  struct tcp_md5sig_key *key,
+						  int bplen,
+						  struct tcphdr *th,
+						  unsigned int tcplen,
+						  struct tcp_md5sig_pool *hp);
+
 extern int			tcp_v4_calc_md5_hash(char *md5_hash,
 						     struct tcp_md5sig_key *key,
 						     struct sock *sk,
 						     struct dst_entry *dst,
 						     struct request_sock *req,
 						     struct tcphdr *th,
-						     int protocol,
 						     unsigned int tcplen);
 extern struct tcp_md5sig_key	*tcp_v4_md5_lookup(struct sock *sk,
 						   struct sock *addr_sk);
@@ -1134,6 +1142,16 @@ extern int			tcp_v4_md5_do_add(struct sock *sk,
 extern int			tcp_v4_md5_do_del(struct sock *sk,
 						  __be32 addr);
 
+#ifdef CONFIG_TCP_MD5SIG
+#define tcp_twsk_md5_key(twsk)	((twsk)->tw_md5_keylen ? 		 \
+				 &(struct tcp_md5sig_key) {		 \
+					.key = (twsk)->tw_md5_key,	 \
+					.keylen = (twsk)->tw_md5_keylen, \
+				} : NULL)
+#else
+#define tcp_twsk_md5_key(twsk)	NULL
+#endif
+
 extern struct tcp_md5sig_pool	**tcp_alloc_md5sig_pool(void);
 extern void			tcp_free_md5sig_pool(void);
 
@@ -1371,7 +1389,6 @@ struct tcp_sock_af_ops {
 						  struct dst_entry *dst,
 						  struct request_sock *req,
 						  struct tcphdr *th,
-						  int protocol,
 						  unsigned int len);
 	int			(*md5_add) (struct sock *sk,
 					    struct sock *addr_sk,

net/ipv4/tcp.c

@@ -2457,6 +2457,76 @@ static unsigned long tcp_md5sig_users;
 static struct tcp_md5sig_pool **tcp_md5sig_pool;
 static DEFINE_SPINLOCK(tcp_md5sig_pool_lock);
 
+int tcp_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
+		      int bplen,
+		      struct tcphdr *th, unsigned int tcplen,
+		      struct tcp_md5sig_pool *hp)
+{
+	struct scatterlist sg[4];
+	__u16 data_len;
+	int block = 0;
+	__sum16 cksum;
+	struct hash_desc *desc = &hp->md5_desc;
+	int err;
+	unsigned int nbytes = 0;
+
+	sg_init_table(sg, 4);
+
+	/* 1. The TCP pseudo-header */
+	sg_set_buf(&sg[block++], &hp->md5_blk, bplen);
+	nbytes += bplen;
+
+	/* 2. The TCP header, excluding options, and assuming a
+	 * checksum of zero
+	 */
+	cksum = th->check;
+	th->check = 0;
+	sg_set_buf(&sg[block++], th, sizeof(*th));
+	nbytes += sizeof(*th);
+
+	/* 3. The TCP segment data (if any) */
+	data_len = tcplen - (th->doff << 2);
+	if (data_len > 0) {
+		u8 *data = (u8 *)th + (th->doff << 2);
+		sg_set_buf(&sg[block++], data, data_len);
+		nbytes += data_len;
+	}
+
+	/* 4. an independently-specified key or password, known to both
+	 * TCPs and presumably connection-specific
+	 */
+	sg_set_buf(&sg[block++], key->key, key->keylen);
+	nbytes += key->keylen;
+
+	sg_mark_end(&sg[block - 1]);
+
+	/* Now store the hash into the packet */
+	err = crypto_hash_init(desc);
+	if (err) {
+		if (net_ratelimit())
+			printk(KERN_WARNING "%s(): hash_init failed\n", __func__);
+		return -1;
+	}
+	err = crypto_hash_update(desc, sg, nbytes);
+	if (err) {
+		if (net_ratelimit())
+			printk(KERN_WARNING "%s(): hash_update failed\n", __func__);
+		return -1;
+	}
+	err = crypto_hash_final(desc, md5_hash);
+	if (err) {
+		if (net_ratelimit())
+			printk(KERN_WARNING "%s(): hash_final failed\n", __func__);
+		return -1;
+	}
+
+	/* Reset header */
+	th->check = cksum;
+
+	return 0;
+}
+EXPORT_SYMBOL(tcp_calc_md5_hash);
+
 static void __tcp_free_md5sig_pool(struct tcp_md5sig_pool **pool)
 {
 	int cpu;

net/ipv4/tcp_input.c

@@ -3448,6 +3448,43 @@ static int tcp_fast_parse_options(struct sk_buff *skb, struct tcphdr *th,
 	return 1;
 }
 
+#ifdef CONFIG_TCP_MD5SIG
+/*
+ * Parse MD5 Signature option
+ */
+u8 *tcp_parse_md5sig_option(struct tcphdr *th)
+{
+	int length = (th->doff << 2) - sizeof (*th);
+	u8 *ptr = (u8*)(th + 1);
+
+	/* If the TCP option is too short, we can short cut */
+	if (length < TCPOLEN_MD5SIG)
+		return NULL;
+
+	while (length > 0) {
+		int opcode = *ptr++;
+		int opsize;
+
+		switch(opcode) {
+		case TCPOPT_EOL:
+			return NULL;
+		case TCPOPT_NOP:
+			length--;
+			continue;
+		default:
+			opsize = *ptr++;
+			if (opsize < 2 || opsize > length)
+				return NULL;
+			if (opcode == TCPOPT_MD5SIG)
+				return ptr;
+		}
+		ptr += opsize - 2;
+		length -= opsize;
+	}
+	return NULL;
+}
+#endif
+
 static inline void tcp_store_ts_recent(struct tcp_sock *tp)
 {
 	tp->rx_opt.ts_recent = tp->rx_opt.rcv_tsval;
@@ -5465,6 +5502,9 @@ EXPORT_SYMBOL(sysctl_tcp_ecn);
 EXPORT_SYMBOL(sysctl_tcp_reordering);
 EXPORT_SYMBOL(sysctl_tcp_adv_win_scale);
 EXPORT_SYMBOL(tcp_parse_options);
+#ifdef CONFIG_TCP_MD5SIG
+EXPORT_SYMBOL(tcp_parse_md5sig_option);
+#endif
 EXPORT_SYMBOL(tcp_rcv_established);
 EXPORT_SYMBOL(tcp_rcv_state_process);
 EXPORT_SYMBOL(tcp_initialize_rcv_mss);

net/ipv4/tcp_ipv4.c

@@ -93,8 +93,13 @@ static struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk,
 						   __be32 addr);
 static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
 				   __be32 saddr, __be32 daddr,
-				   struct tcphdr *th, int protocol,
-				   unsigned int tcplen);
+				   struct tcphdr *th, unsigned int tcplen);
+#else
+static inline
+struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk, __be32 addr)
+{
+	return NULL;
+}
 #endif
 
 struct inet_hashinfo __cacheline_aligned tcp_hashinfo = {
@@ -584,8 +589,7 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
 					key,
 					ip_hdr(skb)->daddr,
 					ip_hdr(skb)->saddr,
-					&rep.th, IPPROTO_TCP,
-					arg.iov[0].iov_len);
+					&rep.th, arg.iov[0].iov_len);
 	}
 #endif
 	arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr,
@@ -604,9 +608,9 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
    outside socket context is ugly, certainly. What can I do?
  */
 
-static void tcp_v4_send_ack(struct tcp_timewait_sock *twsk,
-			    struct sk_buff *skb, u32 seq, u32 ack,
-			    u32 win, u32 ts)
+static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
+			    u32 win, u32 ts, int oif,
+			    struct tcp_md5sig_key *key)
 {
 	struct tcphdr *th = tcp_hdr(skb);
 	struct {
@@ -618,10 +622,6 @@ static void tcp_v4_send_ack(struct tcp_timewait_sock *twsk,
 			];
 	} rep;
 	struct ip_reply_arg arg;
-#ifdef CONFIG_TCP_MD5SIG
-	struct tcp_md5sig_key *key;
-	struct tcp_md5sig_key tw_key;
-#endif
 
 	memset(&rep.th, 0, sizeof(struct tcphdr));
 	memset(&arg, 0, sizeof(arg));
@@ -647,23 +647,6 @@ static void tcp_v4_send_ack(struct tcp_timewait_sock *twsk,
 	rep.th.window  = htons(win);
 
 #ifdef CONFIG_TCP_MD5SIG
-	/*
-	 * The SKB holds an imcoming packet, but may not have a valid ->sk
-	 * pointer. This is especially the case when we're dealing with a
-	 * TIME_WAIT ack, because the sk structure is long gone, and only
-	 * the tcp_timewait_sock remains. So the md5 key is stashed in that
-	 * structure, and we use it in preference.  I believe that (twsk ||
-	 * skb->sk) holds true, but we program defensively.
-	 */
-	if (!twsk && skb->sk) {
-		key = tcp_v4_md5_do_lookup(skb->sk, ip_hdr(skb)->daddr);
-	} else if (twsk && twsk->tw_md5_keylen) {
-		tw_key.key = twsk->tw_md5_key;
-		tw_key.keylen = twsk->tw_md5_keylen;
-		key = &tw_key;
-	} else
-		key = NULL;
-
 	if (key) {
 		int offset = (ts) ? 3 : 0;
 
@@ -678,16 +661,15 @@ static void tcp_v4_send_ack(struct tcp_timewait_sock *twsk,
 					key,
 					ip_hdr(skb)->daddr,
 					ip_hdr(skb)->saddr,
-					&rep.th, IPPROTO_TCP,
-					arg.iov[0].iov_len);
+					&rep.th, arg.iov[0].iov_len);
 	}
 #endif
 	arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr,
 				      ip_hdr(skb)->saddr, /* XXX */
 				      arg.iov[0].iov_len, IPPROTO_TCP, 0);
 	arg.csumoffset = offsetof(struct tcphdr, check) / 2;
-	if (twsk)
-		arg.bound_dev_if = twsk->tw_sk.tw_bound_dev_if;
+	if (oif)
+		arg.bound_dev_if = oif;
 
 	ip_send_reply(dev_net(skb->dev)->ipv4.tcp_sock, skb,
 		      &arg, arg.iov[0].iov_len);
@@ -700,9 +682,12 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
 	struct inet_timewait_sock *tw = inet_twsk(sk);
 	struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
 
-	tcp_v4_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
+	tcp_v4_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
 			tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
-			tcptw->tw_ts_recent);
+			tcptw->tw_ts_recent,
+			tw->tw_bound_dev_if,
+			tcp_twsk_md5_key(tcptw)
+			);
 
 	inet_twsk_put(tw);
 }
@@ -710,9 +695,11 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
 static void tcp_v4_reqsk_send_ack(struct sk_buff *skb,
 				  struct request_sock *req)
 {
-	tcp_v4_send_ack(NULL, skb, tcp_rsk(req)->snt_isn + 1,
+	tcp_v4_send_ack(skb, tcp_rsk(req)->snt_isn + 1,
 			tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd,
-			req->ts_recent);
+			req->ts_recent,
+			0,
+			tcp_v4_md5_do_lookup(skb->sk, ip_hdr(skb)->daddr));
 }
 
 /*
@@ -1004,18 +991,12 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval,
 
 static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
 				   __be32 saddr, __be32 daddr,
-				   struct tcphdr *th, int protocol,
+				   struct tcphdr *th,
 				   unsigned int tcplen)
 {
-	struct scatterlist sg[4];
-	__u16 data_len;
-	int block = 0;
-	__sum16 old_checksum;
 	struct tcp_md5sig_pool *hp;
 	struct tcp4_pseudohdr *bp;
-	struct hash_desc *desc;
 	int err;
-	unsigned int nbytes = 0;
 
 	/*
 	 * Okay, so RFC2385 is turned on for this connection,
@@ -1027,63 +1008,25 @@ static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
 		goto clear_hash_noput;
 
 	bp = &hp->md5_blk.ip4;
-	desc = &hp->md5_desc;
 
 	/*
-	 * 1. the TCP pseudo-header (in the order: source IP address,
+	 * The TCP pseudo-header (in the order: source IP address,
 	 * destination IP address, zero-padded protocol number, and
 	 * segment length)
 	 */
 	bp->saddr = saddr;
 	bp->daddr = daddr;
 	bp->pad = 0;
-	bp->protocol = protocol;
+	bp->protocol = IPPROTO_TCP;
 	bp->len = htons(tcplen);
 
-	sg_init_table(sg, 4);
-
-	sg_set_buf(&sg[block++], bp, sizeof(*bp));
-	nbytes += sizeof(*bp);
-
-	/* 2. the TCP header, excluding options, and assuming a
-	 * checksum of zero/
-	 */
-	old_checksum = th->check;
-	th->check = 0;
-	sg_set_buf(&sg[block++], th, sizeof(struct tcphdr));
-	nbytes += sizeof(struct tcphdr);
-
-	/* 3. the TCP segment data (if any) */
-	data_len = tcplen - (th->doff << 2);
-	if (data_len > 0) {
-		unsigned char *data = (unsigned char *)th + (th->doff << 2);
-		sg_set_buf(&sg[block++], data, data_len);
-		nbytes += data_len;
-	}
-
-	/* 4. an independently-specified key or password, known to both
-	 * TCPs and presumably connection-specific
-	 */
-	sg_set_buf(&sg[block++], key->key, key->keylen);
-	nbytes += key->keylen;
-
-	sg_mark_end(&sg[block - 1]);
-
-	/* Now store the Hash into the packet */
-	err = crypto_hash_init(desc);
-	if (err)
-		goto clear_hash;
-	err = crypto_hash_update(desc, sg, nbytes);
-	if (err)
-		goto clear_hash;
-	err = crypto_hash_final(desc, md5_hash);
+	err = tcp_calc_md5_hash(md5_hash, key, sizeof(*bp),
+				th, tcplen, hp);
 	if (err)
 		goto clear_hash;
 
-	/* Reset header, and free up the crypto */
+	/* Free up the crypto pool */
 	tcp_put_md5sig_pool();
-	th->check = old_checksum;
-
 out:
 	return 0;
 clear_hash:
@@ -1097,7 +1040,7 @@ int tcp_v4_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
 			 struct sock *sk,
 			 struct dst_entry *dst,
 			 struct request_sock *req,
-			 struct tcphdr *th, int protocol,
+			 struct tcphdr *th,
 			 unsigned int tcplen)
 {
 	__be32 saddr, daddr;
@@ -1113,7 +1056,7 @@ int tcp_v4_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
 	}
 	return tcp_v4_do_calc_md5_hash(md5_hash, key,
 				       saddr, daddr,
-				       th, protocol, tcplen);
+				       th, tcplen);
 }
 
 EXPORT_SYMBOL(tcp_v4_calc_md5_hash);
@@ -1132,52 +1075,12 @@ static int tcp_v4_inbound_md5_hash(struct sock *sk, struct sk_buff *skb)
 	struct tcp_md5sig_key *hash_expected;
 	const struct iphdr *iph = ip_hdr(skb);
 	struct tcphdr *th = tcp_hdr(skb);
-	int length = (th->doff << 2) - sizeof(struct tcphdr);
 	int genhash;
-	unsigned char *ptr;
 	unsigned char newhash[16];
 
 	hash_expected = tcp_v4_md5_do_lookup(sk, iph->saddr);
+	hash_location = tcp_parse_md5sig_option(th);
 
-	/*
-	 * If the TCP option length is less than the TCP_MD5SIG
-	 * option length, then we can shortcut
-	 */
-	if (length < TCPOLEN_MD5SIG) {
-		if (hash_expected)
-			return 1;
-		else
-			return 0;
-	}
-
-	/* Okay, we can't shortcut - we have to grub through the options */
-	ptr = (unsigned char *)(th + 1);
-	while (length > 0) {
-		int opcode = *ptr++;
-		int opsize;
-
-		switch (opcode) {
-		case TCPOPT_EOL:
-			goto done_opts;
-		case TCPOPT_NOP:
-			length--;
-			continue;
-		default:
-			opsize = *ptr++;
-			if (opsize < 2)
-				goto done_opts;
-			if (opsize > length)
-				goto done_opts;
-
-			if (opcode == TCPOPT_MD5SIG) {
-				hash_location = ptr;
-				goto done_opts;
-			}
-		}
-		ptr += opsize-2;
-		length -= opsize;
-	}
-done_opts:
 	/* We've parsed the options - do we have a hash? */
 	if (!hash_expected && !hash_location)
 		return 0;
@@ -1204,8 +1107,7 @@ static int tcp_v4_inbound_md5_hash(struct sock *sk, struct sk_buff *skb)
 	genhash = tcp_v4_do_calc_md5_hash(newhash,
 					  hash_expected,
 					  iph->saddr, iph->daddr,
-					  th, sk->sk_protocol,
-					  skb->len);
+					  th, skb->len);
 
 	if (genhash || memcmp(hash_location, newhash, 16) != 0) {
 		if (net_ratelimit()) {

net/ipv4/tcp_output.c

@@ -605,7 +605,6 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 					       md5,
 					       sk, NULL, NULL,
 					       tcp_hdr(skb),
-					       sk->sk_protocol,
 					       skb->len);
 	}
 #endif
@@ -2264,7 +2263,7 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
 		tp->af_specific->calc_md5_hash(md5_hash_location,
 					       md5,
 					       NULL, dst, req,
-					       tcp_hdr(skb), sk->sk_protocol,
+					       tcp_hdr(skb),
 					       skb->len);
 	}
 #endif

net/ipv6/addrconf.c

@@ -229,6 +229,12 @@ static inline int addrconf_qdisc_ok(struct net_device *dev)
 	return (dev->qdisc != &noop_qdisc);
 }
 
+/* Check if a route is valid prefix route */
+static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
+{
+	return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
+}
+
 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 {
 	if (del_timer(&ifp->timer))
@@ -775,7 +781,7 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 		ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 		rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 
-		if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
+		if (rt && addrconf_is_prefix_route(rt)) {
 			if (onlink == 0) {
 				ip6_del_rt(rt);
 				rt = NULL;
@@ -956,7 +962,8 @@ static inline int ipv6_saddr_preferred(int type)
 	return 0;
 }
 
-static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
+static int ipv6_get_saddr_eval(struct net *net,
+			       struct ipv6_saddr_score *score,
 			       struct ipv6_saddr_dst *dst,
 			       int i)
 {
@@ -1035,7 +1042,8 @@ static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
 		break;
 	case IPV6_SADDR_RULE_LABEL:
 		/* Rule 6: Prefer matching label */
-		ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
+		ret = ipv6_addr_label(net,
+				      &score->ifa->addr, score->addr_type,
 				      score->ifa->idev->dev->ifindex) == dst->label;
 		break;
 #ifdef CONFIG_IPV6_PRIVACY
@@ -1089,7 +1097,7 @@ int ipv6_dev_get_saddr(struct net_device *dst_dev,
 	dst.addr = daddr;
 	dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
 	dst.scope = __ipv6_addr_src_scope(dst_type);
-	dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
+	dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
 	dst.prefs = prefs;
 
 	hiscore->rule = -1;
@@ -1157,8 +1165,8 @@ int ipv6_dev_get_saddr(struct net_device *dst_dev,
 			for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
 				int minihiscore, miniscore;
 
-				minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
-				miniscore = ipv6_get_saddr_eval(score, &dst, i);
+				minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
+				miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
 
 				if (minihiscore > miniscore) {
 					if (i == IPV6_SADDR_RULE_SCOPE &&
@@ -1786,7 +1794,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
 		rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
 				dev->ifindex, 1);
 
-		if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
+		if (rt && addrconf_is_prefix_route(rt)) {
 			/* Autoconf prefix route */
 			if (valid_lft == 0) {
 				ip6_del_rt(rt);

net/ipv6/addrlabel.c

@@ -29,6 +29,9 @@
  */
 struct ip6addrlbl_entry
 {
+#ifdef CONFIG_NET_NS
+	struct net *lbl_net;
+#endif
 	struct in6_addr prefix;
 	int prefixlen;
 	int ifindex;
@@ -46,6 +49,16 @@ static struct ip6addrlbl_table
 	u32 seq;
 } ip6addrlbl_table;
 
+static inline
+struct net *ip6addrlbl_net(const struct ip6addrlbl_entry *lbl)
+{
+#ifdef CONFIG_NET_NS
+	return lbl->lbl_net;
+#else
+	return &init_net;
+#endif
+}
+
 /*
  * Default policy table (RFC3484 + extensions)
  *
@@ -65,7 +78,7 @@ static struct ip6addrlbl_table
 
 #define IPV6_ADDR_LABEL_DEFAULT	0xffffffffUL
 
-static const __initdata struct ip6addrlbl_init_table
+static const __net_initdata struct ip6addrlbl_init_table
 {
 	const struct in6_addr *prefix;
 	int prefixlen;
@@ -108,6 +121,9 @@ static const __initdata struct ip6addrlbl_init_table
 /* Object management */
 static inline void ip6addrlbl_free(struct ip6addrlbl_entry *p)
 {
+#ifdef CONFIG_NET_NS
+	release_net(p->lbl_net);
+#endif
 	kfree(p);
 }
 
@@ -128,10 +144,13 @@ static inline void ip6addrlbl_put(struct ip6addrlbl_entry *p)
 }
 
 /* Find label */
-static int __ip6addrlbl_match(struct ip6addrlbl_entry *p,
+static int __ip6addrlbl_match(struct net *net,
+			      struct ip6addrlbl_entry *p,
 			      const struct in6_addr *addr,
 			      int addrtype, int ifindex)
 {
+	if (!net_eq(ip6addrlbl_net(p), net))
+		return 0;
 	if (p->ifindex && p->ifindex != ifindex)
 		return 0;
 	if (p->addrtype && p->addrtype != addrtype)
@@ -141,19 +160,21 @@ static int __ip6addrlbl_match(struct ip6addrlbl_entry *p,
 	return 1;
 }
 
-static struct ip6addrlbl_entry *__ipv6_addr_label(const struct in6_addr *addr,
+static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net,
+						  const struct in6_addr *addr,
 						  int type, int ifindex)
 {
 	struct hlist_node *pos;
 	struct ip6addrlbl_entry *p;
 	hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) {
-		if (__ip6addrlbl_match(p, addr, type, ifindex))
+		if (__ip6addrlbl_match(net, p, addr, type, ifindex))
 			return p;
 	}
 	return NULL;
 }
 
-u32 ipv6_addr_label(const struct in6_addr *addr, int type, int ifindex)
+u32 ipv6_addr_label(struct net *net,
+		    const struct in6_addr *addr, int type, int ifindex)
 {
 	u32 label;
 	struct ip6addrlbl_entry *p;
@@ -161,7 +182,7 @@ u32 ipv6_addr_label(const struct in6_addr *addr, int type, int ifindex)
 	type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK;
 
 	rcu_read_lock();
-	p = __ipv6_addr_label(addr, type, ifindex);
+	p = __ipv6_addr_label(net, addr, type, ifindex);
 	label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT;
 	rcu_read_unlock();
 
@@ -174,7 +195,8 @@ u32 ipv6_addr_label(const struct in6_addr *addr, int type, int ifindex)
 }
 
 /* allocate one entry */
-static struct ip6addrlbl_entry *ip6addrlbl_alloc(const struct in6_addr *prefix,
+static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net,
+						 const struct in6_addr *prefix,
 						 int prefixlen, int ifindex,
 						 u32 label)
 {
@@ -216,6 +238,9 @@ static struct ip6addrlbl_entry *ip6addrlbl_alloc(const struct in6_addr *prefix,
 	newp->addrtype = addrtype;
 	newp->label = label;
 	INIT_HLIST_NODE(&newp->list);
+#ifdef CONFIG_NET_NS
+	newp->lbl_net = hold_net(net);
+#endif
 	atomic_set(&newp->refcnt, 1);
 	return newp;
 }
@@ -237,6 +262,7 @@ static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace)
 		hlist_for_each_entry_safe(p, pos, n,
 					  &ip6addrlbl_table.head, list) {
 			if (p->prefixlen == newp->prefixlen &&
+			    net_eq(ip6addrlbl_net(p), ip6addrlbl_net(newp)) &&
 			    p->ifindex == newp->ifindex &&
 			    ipv6_addr_equal(&p->prefix, &newp->prefix)) {
 				if (!replace) {
@@ -261,7 +287,8 @@ static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace)
 }
 
 /* add a label */
-static int ip6addrlbl_add(const struct in6_addr *prefix, int prefixlen,
+static int ip6addrlbl_add(struct net *net,
+			  const struct in6_addr *prefix, int prefixlen,
 			  int ifindex, u32 label, int replace)
 {
 	struct ip6addrlbl_entry *newp;
@@ -274,7 +301,7 @@ static int ip6addrlbl_add(const struct in6_addr *prefix, int prefixlen,
 			(unsigned int)label,
 			replace);
 
-	newp = ip6addrlbl_alloc(prefix, prefixlen, ifindex, label);
+	newp = ip6addrlbl_alloc(net, prefix, prefixlen, ifindex, label);
 	if (IS_ERR(newp))
 		return PTR_ERR(newp);
 	spin_lock(&ip6addrlbl_table.lock);
@@ -286,7 +313,8 @@ static int ip6addrlbl_add(const struct in6_addr *prefix, int prefixlen,
 }
 
 /* remove a label */
-static int __ip6addrlbl_del(const struct in6_addr *prefix, int prefixlen,
+static int __ip6addrlbl_del(struct net *net,
+			    const struct in6_addr *prefix, int prefixlen,
 			    int ifindex)
 {
 	struct ip6addrlbl_entry *p = NULL;
@@ -300,6 +328,7 @@ static int __ip6addrlbl_del(const struct in6_addr *prefix, int prefixlen,
 
 	hlist_for_each_entry_safe(p, pos, n, &ip6addrlbl_table.head, list) {
 		if (p->prefixlen == prefixlen &&
+		    net_eq(ip6addrlbl_net(p), net) &&
 		    p->ifindex == ifindex &&
 		    ipv6_addr_equal(&p->prefix, prefix)) {
 			hlist_del_rcu(&p->list);
@@ -311,7 +340,8 @@ static int __ip6addrlbl_del(const struct in6_addr *prefix, int prefixlen,
 	return ret;
 }
 
-static int ip6addrlbl_del(const struct in6_addr *prefix, int prefixlen,
+static int ip6addrlbl_del(struct net *net,
+			  const struct in6_addr *prefix, int prefixlen,
 			  int ifindex)
 {
 	struct in6_addr prefix_buf;
@@ -324,13 +354,13 @@ static int ip6addrlbl_del(const struct in6_addr *prefix, int prefixlen,
 
 	ipv6_addr_prefix(&prefix_buf, prefix, prefixlen);
 	spin_lock(&ip6addrlbl_table.lock);
-	ret = __ip6addrlbl_del(&prefix_buf, prefixlen, ifindex);
+	ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex);
 	spin_unlock(&ip6addrlbl_table.lock);
 	return ret;
 }
 
 /* add default label */
-static __init int ip6addrlbl_init(void)
+static int __net_init ip6addrlbl_net_init(struct net *net)
 {
 	int err = 0;
 	int i;
@@ -338,7 +368,8 @@ static __init int ip6addrlbl_init(void)
 	ADDRLABEL(KERN_DEBUG "%s()\n", __func__);
 
 	for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) {
-		int ret = ip6addrlbl_add(ip6addrlbl_init_table[i].prefix,
+		int ret = ip6addrlbl_add(net,
+					 ip6addrlbl_init_table[i].prefix,
 					 ip6addrlbl_init_table[i].prefixlen,
 					 0,
 					 ip6addrlbl_init_table[i].label, 0);
@@ -349,11 +380,32 @@ static __init int ip6addrlbl_init(void)
 	return err;
 }
 
+static void __net_exit ip6addrlbl_net_exit(struct net *net)
+{
+	struct ip6addrlbl_entry *p = NULL;
+	struct hlist_node *pos, *n;
+
+	/* Remove all labels belonging to the exiting net */
+	spin_lock(&ip6addrlbl_table.lock);
+	hlist_for_each_entry_safe(p, pos, n, &ip6addrlbl_table.head, list) {
+		if (net_eq(ip6addrlbl_net(p), net)) {
+			hlist_del_rcu(&p->list);
+			ip6addrlbl_put(p);
+		}
+	}
+	spin_unlock(&ip6addrlbl_table.lock);
+}
+
+static struct pernet_operations ipv6_addr_label_ops = {
+	.init = ip6addrlbl_net_init,
+	.exit = ip6addrlbl_net_exit,
+};
+
 int __init ipv6_addr_label_init(void)
 {
 	spin_lock_init(&ip6addrlbl_table.lock);
 
-	return ip6addrlbl_init();
+	return register_pernet_subsys(&ipv6_addr_label_ops);
 }
 
 static const struct nla_policy ifal_policy[IFAL_MAX+1] = {
@@ -371,9 +423,6 @@ static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh,
 	u32 label;
 	int err = 0;
 
-	if (net != &init_net)
-		return 0;
-
 	err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy);
 	if (err < 0)
 		return err;
@@ -385,7 +434,7 @@ static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh,
 		return -EINVAL;
 
 	if (ifal->ifal_index &&
-	    !__dev_get_by_index(&init_net, ifal->ifal_index))
+	    !__dev_get_by_index(net, ifal->ifal_index))
 		return -EINVAL;
 
 	if (!tb[IFAL_ADDRESS])
@@ -403,12 +452,12 @@ static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh,
 
 	switch(nlh->nlmsg_type) {
 	case RTM_NEWADDRLABEL:
-		err = ip6addrlbl_add(pfx, ifal->ifal_prefixlen,
+		err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen,
 				     ifal->ifal_index, label,
 				     nlh->nlmsg_flags & NLM_F_REPLACE);
 		break;
 	case RTM_DELADDRLABEL:
-		err = ip6addrlbl_del(pfx, ifal->ifal_prefixlen,
+		err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen,
 				     ifal->ifal_index);
 		break;
 	default:
@@ -458,12 +507,10 @@ static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb)
 	int idx = 0, s_idx = cb->args[0];
 	int err;
 
-	if (net != &init_net)
-		return 0;
-
 	rcu_read_lock();
 	hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) {
-		if (idx >= s_idx) {
+		if (idx >= s_idx &&
+		    net_eq(ip6addrlbl_net(p), net)) {
 			if ((err = ip6addrlbl_fill(skb, p,
 						   ip6addrlbl_table.seq,
 						   NETLINK_CB(cb->skb).pid,
@@ -499,9 +546,6 @@ static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh,
 	struct ip6addrlbl_entry *p;
 	struct sk_buff *skb;
 
-	if (net != &init_net)
-		return 0;
-
 	err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy);
 	if (err < 0)
 		return err;
@@ -513,7 +557,7 @@ static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh,
 		return -EINVAL;
 
 	if (ifal->ifal_index &&
-	    !__dev_get_by_index(&init_net, ifal->ifal_index))
+	    !__dev_get_by_index(net, ifal->ifal_index))
 		return -EINVAL;
 
 	if (!tb[IFAL_ADDRESS])
@@ -524,7 +568,7 @@ static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh,
 		return -EINVAL;
 
 	rcu_read_lock();
-	p = __ipv6_addr_label(addr, ipv6_addr_type(addr), ifal->ifal_index);
+	p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index);
 	if (p && ip6addrlbl_hold(p))
 		p = NULL;
 	lseq = ip6addrlbl_table.seq;
@@ -552,7 +596,7 @@ static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh,
 		goto out;
 	}
 
-	err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
+	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
 out:
 	return err;
 }

net/ipv6/ip6mr.c

@@ -1240,7 +1240,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int
 
 #endif
 	/*
-	 *	Spurious command, or MRT_VERSION which you cannot
+	 *	Spurious command, or MRT6_VERSION which you cannot
 	 *	set.
 	 */
 	default:

net/ipv6/mcast.c

@@ -162,7 +162,6 @@ static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 	((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
 	(MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
 
-#define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
 
 #define IPV6_MLD_MAX_MSF	64

net/ipv6/tcp_ipv6.c

@@ -80,6 +80,12 @@ static struct inet_connection_sock_af_ops ipv6_specific;
 #ifdef CONFIG_TCP_MD5SIG
 static struct tcp_sock_af_ops tcp_sock_ipv6_specific;
 static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
+#else
+static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
+						   struct in6_addr *addr)
+{
+	return NULL;
+}
 #endif
 
 static void tcp_v6_hash(struct sock *sk)
@@ -734,78 +740,34 @@ static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
 static int tcp_v6_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
 				   struct in6_addr *saddr,
 				   struct in6_addr *daddr,
-				   struct tcphdr *th, int protocol,
-				   unsigned int tcplen)
+				   struct tcphdr *th, unsigned int tcplen)
 {
-	struct scatterlist sg[4];
-	__u16 data_len;
-	int block = 0;
-	__sum16 cksum;
 	struct tcp_md5sig_pool *hp;
 	struct tcp6_pseudohdr *bp;
-	struct hash_desc *desc;
 	int err;
-	unsigned int nbytes = 0;
 
 	hp = tcp_get_md5sig_pool();
 	if (!hp) {
 		printk(KERN_WARNING "%s(): hash pool not found...\n", __func__);
 		goto clear_hash_noput;
 	}
+
 	bp = &hp->md5_blk.ip6;
-	desc = &hp->md5_desc;
 
 	/* 1. TCP pseudo-header (RFC2460) */
 	ipv6_addr_copy(&bp->saddr, saddr);
 	ipv6_addr_copy(&bp->daddr, daddr);
 	bp->len = htonl(tcplen);
-	bp->protocol = htonl(protocol);
-
-	sg_init_table(sg, 4);
+	bp->protocol = htonl(IPPROTO_TCP);
 
-	sg_set_buf(&sg[block++], bp, sizeof(*bp));
-	nbytes += sizeof(*bp);
+	err = tcp_calc_md5_hash(md5_hash, key, sizeof(*bp),
+				th, tcplen, hp);
 
-	/* 2. TCP header, excluding options */
-	cksum = th->check;
-	th->check = 0;
-	sg_set_buf(&sg[block++], th, sizeof(*th));
-	nbytes += sizeof(*th);
-
-	/* 3. TCP segment data (if any) */
-	data_len = tcplen - (th->doff << 2);
-	if (data_len > 0) {
-		u8 *data = (u8 *)th + (th->doff << 2);
-		sg_set_buf(&sg[block++], data, data_len);
-		nbytes += data_len;
-	}
-
-	/* 4. shared key */
-	sg_set_buf(&sg[block++], key->key, key->keylen);
-	nbytes += key->keylen;
-
-	sg_mark_end(&sg[block - 1]);
-
-	/* Now store the hash into the packet */
-	err = crypto_hash_init(desc);
-	if (err) {
-		printk(KERN_WARNING "%s(): hash_init failed\n", __func__);
-		goto clear_hash;
-	}
-	err = crypto_hash_update(desc, sg, nbytes);
-	if (err) {
-		printk(KERN_WARNING "%s(): hash_update failed\n", __func__);
-		goto clear_hash;
-	}
-	err = crypto_hash_final(desc, md5_hash);
-	if (err) {
-		printk(KERN_WARNING "%s(): hash_final failed\n", __func__);
+	if (err)
 		goto clear_hash;
-	}
 
-	/* Reset header, and free up the crypto */
+	/* Free up the crypto pool */
 	tcp_put_md5sig_pool();
-	th->check = cksum;
 out:
 	return 0;
 clear_hash:
@@ -819,8 +781,7 @@ static int tcp_v6_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
 				struct sock *sk,
 				struct dst_entry *dst,
 				struct request_sock *req,
-				struct tcphdr *th, int protocol,
-				unsigned int tcplen)
+				struct tcphdr *th, unsigned int tcplen)
 {
 	struct in6_addr *saddr, *daddr;
 
@@ -833,7 +794,7 @@ static int tcp_v6_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
 	}
 	return tcp_v6_do_calc_md5_hash(md5_hash, key,
 				       saddr, daddr,
-				       th, protocol, tcplen);
+				       th, tcplen);
 }
 
 static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
@@ -842,43 +803,12 @@ static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
 	struct tcp_md5sig_key *hash_expected;
 	struct ipv6hdr *ip6h = ipv6_hdr(skb);
 	struct tcphdr *th = tcp_hdr(skb);
-	int length = (th->doff << 2) - sizeof (*th);
 	int genhash;
-	u8 *ptr;
 	u8 newhash[16];
 
 	hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
+	hash_location = tcp_parse_md5sig_option(th);
 
-	/* If the TCP option is too short, we can short cut */
-	if (length < TCPOLEN_MD5SIG)
-		return hash_expected ? 1 : 0;
-
-	/* parse options */
-	ptr = (u8*)(th + 1);
-	while (length > 0) {
-		int opcode = *ptr++;
-		int opsize;
-
-		switch(opcode) {
-		case TCPOPT_EOL:
-			goto done_opts;
-		case TCPOPT_NOP:
-			length--;
-			continue;
-		default:
-			opsize = *ptr++;
-			if (opsize < 2 || opsize > length)
-				goto done_opts;
-			if (opcode == TCPOPT_MD5SIG) {
-				hash_location = ptr;
-				goto done_opts;
-			}
-		}
-		ptr += opsize - 2;
-		length -= opsize;
-	}
-
-done_opts:
 	/* do we have a hash as expected? */
 	if (!hash_expected) {
 		if (!hash_location)
@@ -908,8 +838,7 @@ static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
 	genhash = tcp_v6_do_calc_md5_hash(newhash,
 					  hash_expected,
 					  &ip6h->saddr, &ip6h->daddr,
-					  th, sk->sk_protocol,
-					  skb->len);
+					  th, skb->len);
 	if (genhash || memcmp(hash_location, newhash, 16) != 0) {
 		if (net_ratelimit()) {
 			printk(KERN_INFO "MD5 Hash %s for "
@@ -1049,7 +978,7 @@ static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
 		tcp_v6_do_calc_md5_hash((__u8 *)&opt[1], key,
 					&ipv6_hdr(skb)->daddr,
 					&ipv6_hdr(skb)->saddr,
-					t1, IPPROTO_TCP, tot_len);
+					t1, tot_len);
 	}
 #endif
 
@@ -1086,8 +1015,8 @@ static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
 	kfree_skb(buff);
 }
 
-static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
-			    struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts)
+static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts,
+			    struct tcp_md5sig_key *key)
 {
 	struct tcphdr *th = tcp_hdr(skb), *t1;
 	struct sk_buff *buff;
@@ -1096,22 +1025,6 @@ static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
 	struct sock *ctl_sk = net->ipv6.tcp_sk;
 	unsigned int tot_len = sizeof(struct tcphdr);
 	__be32 *topt;
-#ifdef CONFIG_TCP_MD5SIG
-	struct tcp_md5sig_key *key;
-	struct tcp_md5sig_key tw_key;
-#endif
-
-#ifdef CONFIG_TCP_MD5SIG
-	if (!tw && skb->sk) {
-		key = tcp_v6_md5_do_lookup(skb->sk, &ipv6_hdr(skb)->daddr);
-	} else if (tw && tw->tw_md5_keylen) {
-		tw_key.key = tw->tw_md5_key;
-		tw_key.keylen = tw->tw_md5_keylen;
-		key = &tw_key;
-	} else {
-		key = NULL;
-	}
-#endif
 
 	if (ts)
 		tot_len += TCPOLEN_TSTAMP_ALIGNED;
@@ -1155,7 +1068,7 @@ static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
 		tcp_v6_do_calc_md5_hash((__u8 *)topt, key,
 					&ipv6_hdr(skb)->daddr,
 					&ipv6_hdr(skb)->saddr,
-					t1, IPPROTO_TCP, tot_len);
+					t1, tot_len);
 	}
 #endif
 
@@ -1191,16 +1104,17 @@ static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
 	struct inet_timewait_sock *tw = inet_twsk(sk);
 	struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
 
-	tcp_v6_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
+	tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
 			tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
-			tcptw->tw_ts_recent);
+			tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw));
 
 	inet_twsk_put(tw);
 }
 
 static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req)
 {
-	tcp_v6_send_ack(NULL, skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent);
+	tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent,
+			tcp_v6_md5_do_lookup(skb->sk, &ipv6_hdr(skb)->daddr));
 }