netdev - [Patch net-next] net: remove last caller of skb_tail

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Date:	Wed,  5 Jun 2013 20:14:10 +0800
From:	Cong Wang <amwang@...hat.com>
To:	netdev@...r.kernel.org
Cc:	Thomas Graf <tgraf@...g.ch>,
	Daniel Borkmann <dborkmann@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Cong Wang <amwang@...hat.com>
Subject: [Patch net-next] net: remove last caller of skb_tail_offset() and itself

From: Cong Wang <amwang@...hat.com>

Similar to the following commits:

commit 00f97da17a0c8d656d0c9 (netpoll: fix position of network header)
commit 525cebedb32a87fa48584 (pktgen: Fix position of ip and udp header)

using skb_tail_offset() seems not correct since the offset
is based on head pointer.

With the last caller removed, skb_tail_offset() can be killed
finally.

Cc: Thomas Graf <tgraf@...g.ch>
Cc: Daniel Borkmann <dborkmann@...hat.com>
Cc: David S. Miller <davem@...emloft.net>
Signed-off-by: Cong Wang <amwang@...hat.com>

---
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index b999790..fd42776 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1392,10 +1392,6 @@ static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset)
 	skb->tail += offset;
 }
 
-static inline unsigned long skb_tail_offset(const struct sk_buff *skb)
-{
-	return skb->tail;
-}
 #else /* NET_SKBUFF_DATA_USES_OFFSET */
 static inline unsigned char *skb_tail_pointer(const struct sk_buff *skb)
 {
@@ -1412,10 +1408,6 @@ static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset)
 	skb->tail = skb->data + offset;
 }
 
-static inline unsigned long skb_tail_offset(const struct sk_buff *skb)
-{
-	return skb->tail - skb->head;
-}
 #endif /* NET_SKBUFF_DATA_USES_OFFSET */
 
 /*
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index df97f0a..132a096 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -945,7 +945,6 @@ static int ipmr_cache_report(struct mr_table *mrt,
 	struct igmpmsg *msg;
 	struct sock *mroute_sk;
 	int ret;
-	unsigned long tail_offset;
 
 #ifdef CONFIG_IP_PIMSM
 	if (assert == IGMPMSG_WHOLEPKT)
@@ -981,12 +980,7 @@ static int ipmr_cache_report(struct mr_table *mrt,
 
 	/* Copy the IP header */
 
-	tail_offset = skb_tail_offset(skb);
-	if (tail_offset > 0xffff) {
-		kfree_skb(skb);
-		return -EINVAL;
-	}
-	skb_set_network_header(skb, tail_offset);
+	skb_set_network_header(skb, skb->len);
 	skb_put(skb, ihl);
 	skb_copy_to_linear_data(skb, pkt->data, ihl);
 	ip_hdr(skb)->protocol = 0;	/* Flag to the kernel this is a route add */
--
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