netpoll: fix position of network header

Similar to the problem in pktgen, netpoll uses skb_tail_offset() too, as the code is copied from pktgen. Also use return values of skb_put() directly, this will simiplify the code. Reported-by: Thomas Graf <[email protected]> Cc: Thomas Graf <[email protected]> Cc: Daniel Borkmann <[email protected]> Cc: David S. Miller <[email protected]> Signed-off-by: Cong Wang <[email protected]> Signed-off-by: David S. Miller <[email protected]>
rtvt123 · Jun 5, 2013 · 00f97da · 00f97da
1 parent 525cebe
commit 00f97da
Showing 1 changed file with 4 additions and 16 deletions.
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
@@ -676,8 +676,6 @@ static void netpoll_neigh_reply(struct sk_buff *skb, struct netpoll_info *npinfo
 
 		spin_lock_irqsave(&npinfo->rx_lock, flags);
 		list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
-			unsigned long tail_offset;
-
 			if (!ipv6_addr_equal(daddr, &np->local_ip.in6))
 				continue;
 
@@ -691,30 +689,20 @@ static void netpoll_neigh_reply(struct sk_buff *skb, struct netpoll_info *npinfo
 			send_skb->dev = skb->dev;
 
 			skb_reset_network_header(send_skb);
-			skb_put(send_skb, sizeof(struct ipv6hdr));
-			hdr = ipv6_hdr(send_skb);
-
+			hdr = (struct ipv6hdr *) skb_put(send_skb, sizeof(struct ipv6hdr));
 			*(__be32*)hdr = htonl(0x60000000);
-
 			hdr->payload_len = htons(size);
 			hdr->nexthdr = IPPROTO_ICMPV6;
 			hdr->hop_limit = 255;
 			hdr->saddr = *saddr;
 			hdr->daddr = *daddr;
 
-			tail_offset = skb_tail_offset(skb);
-			if (tail_offset > 0xffff) {
-				kfree_skb(send_skb);
-				continue;
-			}
-			skb_set_network_header(send_skb, tail_offset);
-			skb_put(send_skb, size);
-
-			icmp6h = (struct icmp6hdr *)skb_transport_header(skb);
+			icmp6h = (struct icmp6hdr *) skb_put(send_skb, sizeof(struct icmp6hdr));
 			icmp6h->icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
 			icmp6h->icmp6_router = 0;
 			icmp6h->icmp6_solicited = 1;
-			target = (struct in6_addr *)(skb_transport_header(send_skb) + sizeof(struct icmp6hdr));
+
+			target = (struct in6_addr *) skb_put(send_skb, sizeof(struct in6_addr));
 			*target = msg->target;
 			icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, size,
 							      IPPROTO_ICMPV6,