net: skb->dst accessors

Define three accessors to get/set dst attached to a skb

struct dst_entry *skb_dst(const struct sk_buff *skb)

void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst)

void skb_dst_drop(struct sk_buff *skb)
This one should replace occurrences of :
dst_release(skb->dst)
skb->dst = NULL;

Delete skb->dst field

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 6 deletions

diff --git a/drivers/net/pppol2tp.c b/drivers/net/pppol2tp.c
index 5981debcde5e..e7935d09c896 100644
--- a/drivers/net/pppol2tp.c
+++ b/drivers/net/pppol2tp.c
@@ -433,8 +433,7 @@ static void pppol2tp_recv_dequeue_skb(struct pppol2tp_session *session, struct s
                  *   to the inner packet either
                  */
                 secpath_reset(skb);
-                dst_release(skb->dst);
-                skb->dst = NULL;
+                skb_dst_drop(skb);
                 nf_reset(skb);
 
                 po = pppox_sk(session_sock);
@@ -976,7 +975,7 @@ static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msgh
         /* Calculate UDP checksum if configured to do so */
         if (sk_tun->sk_no_check == UDP_CSUM_NOXMIT)
                 skb->ip_summed = CHECKSUM_NONE;
-        else if (!(skb->dst->dev->features & NETIF_F_V4_CSUM)) {
+        else if (!(skb_dst(skb)->dev->features & NETIF_F_V4_CSUM)) {
                 skb->ip_summed = CHECKSUM_COMPLETE;
                 csum = skb_checksum(skb, 0, udp_len, 0);
                 uh->check = csum_tcpudp_magic(inet->saddr, inet->daddr,
@@ -1172,14 +1171,14 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
         nf_reset(skb);
 
         /* Get routing info from the tunnel socket */
-        dst_release(skb->dst);
-        skb->dst = dst_clone(__sk_dst_get(sk_tun));
+        skb_dst_drop(skb);
+        skb_dst_set(skb, dst_clone(__sk_dst_get(sk_tun)));
         pppol2tp_skb_set_owner_w(skb, sk_tun);
 
         /* Calculate UDP checksum if configured to do so */
         if (sk_tun->sk_no_check == UDP_CSUM_NOXMIT)
                 skb->ip_summed = CHECKSUM_NONE;
-        else if (!(skb->dst->dev->features & NETIF_F_V4_CSUM)) {
+        else if (!(skb_dst(skb)->dev->features & NETIF_F_V4_CSUM)) {
                 skb->ip_summed = CHECKSUM_COMPLETE;
                 csum = skb_checksum(skb, 0, udp_len, 0);
                 uh->check = csum_tcpudp_magic(inet->saddr, inet->daddr,