[PPPOE]: Introduce pppoe_hdr()

For consistency with all the other skb->nh.raw accessors.

Also do some really obvious simplifications in pppoe_recvmsg, well the
kfree_skb one is not so obvious, but free() and kfree() have the same behaviour
(hint :-) ).

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 15 insertions, 14 deletions

diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c
index ebfa2967cd68..3080a44b23ab 100644
--- a/drivers/net/pppoe.c
+++ b/drivers/net/pppoe.c
@@ -347,7 +347,7 @@ static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb)
         struct pppox_sock *relay_po = NULL;
 
         if (sk->sk_state & PPPOX_BOUND) {
-                struct pppoe_hdr *ph = (struct pppoe_hdr *) skb->nh.raw;
+                struct pppoe_hdr *ph = pppoe_hdr(skb);
                 int len = ntohs(ph->length);
                 skb_pull_rcsum(skb, sizeof(struct pppoe_hdr));
                 if (pskb_trim_rcsum(skb, len))
@@ -401,7 +401,7 @@ static int pppoe_rcv(struct sk_buff *skb,
         if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
                 goto out;
 
-        ph = (struct pppoe_hdr *) skb->nh.raw;
+        ph = pppoe_hdr(skb);
 
         po = get_item((unsigned long) ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
         if (po != NULL)
@@ -433,7 +433,7 @@ static int pppoe_disc_rcv(struct sk_buff *skb,
         if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
                 goto out;
 
-        ph = (struct pppoe_hdr *) skb->nh.raw;
+        ph = pppoe_hdr(skb);
         if (ph->code != PADT_CODE)
                 goto abort;
 
@@ -931,8 +931,6 @@ static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock,
         struct sock *sk = sock->sk;
         struct sk_buff *skb = NULL;
         int error = 0;
-        int len;
-        struct pppoe_hdr *ph = NULL;
 
         if (sk->sk_state & PPPOX_BOUND) {
                 error = -EIO;
@@ -949,19 +947,15 @@ static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock,
         m->msg_namelen = 0;
 
         if (skb) {
-                error = 0;
-                ph = (struct pppoe_hdr *) skb->nh.raw;
-                len = ntohs(ph->length);
+                struct pppoe_hdr *ph = pppoe_hdr(skb);
+                const int len = ntohs(ph->length);
 
                 error = memcpy_toiovec(m->msg_iov, (unsigned char *) &ph->tag[0], len);
-                if (error < 0)
-                        goto do_skb_free;
-                error = len;
+                if (error == 0)
+                        error = len;
         }
 
-do_skb_free:
-        if (skb)
-                kfree_skb(skb);
+        kfree_skb(skb);
 end:
         return error;
 }
diff --git a/include/linux/if_pppox.h b/include/linux/if_pppox.h
index e33ee763c052..7044f8ab30a0 100644
--- a/include/linux/if_pppox.h
+++ b/include/linux/if_pppox.h
@@ -112,6 +112,13 @@ struct pppoe_hdr {
 } __attribute__ ((packed));
 
 #ifdef __KERNEL__
+#include <linux/skbuff.h>
+
+static inline struct pppoe_hdr *pppoe_hdr(const struct sk_buff *skb)
+{
+        return (struct pppoe_hdr *)skb->nh.raw;
+}
+
 struct pppoe_opt {
         struct net_device      *dev;      /* device associated with socket*/
         int                     ifindex;  /* ifindex of device associated with socket */