[IPV6] Fix skb allocation size for RST and ACK.

Signed-off-by: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>

net/ipv6/tcp_ipv6.c

@@ -1003,11 +1003,12 @@ static void tcp_v6_send_reset(struct sk_buff *skb)
 	 * and then put it into the queue to be sent.
 	 */
 
-	buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr), GFP_ATOMIC);
+	buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr),
+			 GFP_ATOMIC);
 	if (buff == NULL) 
 	  	return;
 
-	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr));
+	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr));
 
 	t1 = (struct tcphdr *) skb_push(buff,sizeof(struct tcphdr));
 
@@ -1065,14 +1066,15 @@ static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32
 	struct flowi fl;
 	int tot_len = sizeof(struct tcphdr);
 
-	buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr), GFP_ATOMIC);
+	if (ts)
+		tot_len += 3*4;
+
+	buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
+			 GFP_ATOMIC);
 	if (buff == NULL)
 		return;
 
-	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr));
-
-	if (ts)
-		tot_len += 3*4;
+	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
 
 	t1 = (struct tcphdr *) skb_push(buff,tot_len);