[SOCK]: Introduce sk_receive_skb

Its common enough to to justify that, TCP still can't use it as it has the
prequeueing stuff, still to be made generic in the not so distant future :-)
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/pppoe.c

@@ -383,8 +383,6 @@ static int pppoe_rcv(struct sk_buff *skb,
 {
 	struct pppoe_hdr *ph;
 	struct pppox_sock *po;
-	struct sock *sk;
-	int ret;
 
 	if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
 		goto drop;
@@ -395,24 +393,8 @@ static int pppoe_rcv(struct sk_buff *skb,
 	ph = (struct pppoe_hdr *) skb->nh.raw;
 
 	po = get_item((unsigned long) ph->sid, eth_hdr(skb)->h_source);
-	if (!po) 
-		goto drop;
-
-	sk = sk_pppox(po);
-	bh_lock_sock(sk);
-
-	/* Socket state is unknown, must put skb into backlog. */
-	if (sock_owned_by_user(sk) != 0) {
-		sk_add_backlog(sk, skb);
-		ret = NET_RX_SUCCESS;
-	} else {
-		ret = pppoe_rcv_core(sk, skb);
-	}
-
-	bh_unlock_sock(sk);
-	sock_put(sk);
-
-	return ret;
+	if (po != NULL) 
+		return sk_receive_skb(sk_pppox(po), skb);
 drop:
 	kfree_skb(skb);
 out:

include/net/sock.h

@@ -926,6 +926,29 @@ static inline void sock_put(struct sock *sk)
 		sk_free(sk);
 }
 
+static inline int sk_receive_skb(struct sock *sk, struct sk_buff *skb)
+{
+	int rc = NET_RX_SUCCESS;
+
+	if (sk_filter(sk, skb, 0))
+		goto discard_and_relse;
+
+	skb->dev = NULL;
+
+	bh_lock_sock(sk);
+	if (!sock_owned_by_user(sk))
+		rc = sk->sk_backlog_rcv(sk, skb);
+	else
+		sk_add_backlog(sk, skb);
+	bh_unlock_sock(sk);
+out:
+	sock_put(sk);
+	return rc;
+discard_and_relse:
+	kfree_skb(skb);
+	goto out;
+}
+
 /* Detach socket from process context.
  * Announce socket dead, detach it from wait queue and inode.
  * Note that parent inode held reference count on this struct sock,

net/dccp/ipv4.c

@@ -914,7 +914,6 @@ int dccp_v4_rcv(struct sk_buff *skb)
 {
 	const struct dccp_hdr *dh;
 	struct sock *sk;
-	int rc;
 
 	/* Step 1: Check header basics: */
 
@@ -984,28 +983,10 @@ int dccp_v4_rcv(struct sk_buff *skb)
                 goto do_time_wait;
 	}
 
-	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
-		dccp_pr_debug("xfrm4_policy_check failed\n");
+	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
 		goto discard_and_relse;
-	}
-
-        if (sk_filter(sk, skb, 0)) {
-		dccp_pr_debug("sk_filter failed\n");
-                goto discard_and_relse;
-	}
-
-	skb->dev = NULL;
 
-	bh_lock_sock(sk);
-	rc = 0;
-	if (!sock_owned_by_user(sk))
-		rc = dccp_v4_do_rcv(sk, skb);
-	else
-		sk_add_backlog(sk, skb);
-	bh_unlock_sock(sk);
-
-	sock_put(sk);
-	return rc;
+	return sk_receive_skb(sk, skb);
 
 no_dccp_socket:
 	if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))

net/dccp/ipv6.c

@@ -1032,7 +1032,6 @@ static int dccp_v6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
 	const struct dccp_hdr *dh;
 	struct sk_buff *skb = *pskb;
 	struct sock *sk;
-	int rc;
 
 	/* Step 1: Check header basics: */
 
@@ -1077,21 +1076,7 @@ static int dccp_v6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
 	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 		goto discard_and_relse;
 
-	if (sk_filter(sk, skb, 0))
-		goto discard_and_relse;
-
-	skb->dev = NULL;
-
-	bh_lock_sock(sk);
-	rc = 0;
-	if (!sock_owned_by_user(sk))
-		rc = dccp_v6_do_rcv(sk, skb);
-	else
-		sk_add_backlog(sk, skb);
-	bh_unlock_sock(sk);
-
-	sock_put(sk);
-	return rc ? -1 : 0;
+	return sk_receive_skb(sk, skb) ? -1 : 0;
 
 no_dccp_socket:
 	if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))

net/decnet/dn_nsp_in.c

@@ -793,7 +793,6 @@ static int dn_nsp_rx_packet(struct sk_buff *skb)
 got_it:
 	if (sk != NULL) {
 		struct dn_scp *scp = DN_SK(sk);
-		int ret;
 
 		/* Reset backoff */
 		scp->nsp_rxtshift = 0;
@@ -807,21 +806,7 @@ static int dn_nsp_rx_packet(struct sk_buff *skb)
 				goto free_out;
 		}
 
-		bh_lock_sock(sk);
-		ret = NET_RX_SUCCESS;
-		if (decnet_debug_level & 8)
-			printk(KERN_DEBUG "NSP: 0x%02x 0x%02x 0x%04x 0x%04x %d\n",
-				(int)cb->rt_flags, (int)cb->nsp_flags, 
-				(int)cb->src_port, (int)cb->dst_port, 
-				!!sock_owned_by_user(sk));
-		if (!sock_owned_by_user(sk))
-			ret = dn_nsp_backlog_rcv(sk, skb);
-		else
-			sk_add_backlog(sk, skb);
-		bh_unlock_sock(sk);
-		sock_put(sk);
-
-		return ret;
+		return sk_receive_skb(sk, skb);
 	}
 
 	return dn_nsp_no_socket(skb, reason);