1 files changed, 93 insertions, 0 deletions

diff --git a/net/core/sock.c b/net/core/sock.c
index e110b9004147..a96ea7dd0fc1 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -187,6 +187,99 @@ static void sock_disable_timestamp(struct sock *sk)
 }
 
 
+int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
+{
+        int err = 0;
+        int skb_len;
+
+        /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
+           number of warnings when compiling with -W --ANK
+         */
+        if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
+            (unsigned)sk->sk_rcvbuf) {
+                err = -ENOMEM;
+                goto out;
+        }
+
+        /* It would be deadlock, if sock_queue_rcv_skb is used
+           with socket lock! We assume that users of this
+           function are lock free.
+        */
+        err = sk_filter(sk, skb, 1);
+        if (err)
+                goto out;
+
+        skb->dev = NULL;
+        skb_set_owner_r(skb, sk);
+
+        /* Cache the SKB length before we tack it onto the receive
+         * queue.  Once it is added it no longer belongs to us and
+         * may be freed by other threads of control pulling packets
+         * from the queue.
+         */
+        skb_len = skb->len;
+
+        skb_queue_tail(&sk->sk_receive_queue, skb);
+
+        if (!sock_flag(sk, SOCK_DEAD))
+                sk->sk_data_ready(sk, skb_len);
+out:
+        return err;
+}
+EXPORT_SYMBOL(sock_queue_rcv_skb);
+
+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;
+}
+EXPORT_SYMBOL(sk_receive_skb);
+
+struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
+{
+        struct dst_entry *dst = sk->sk_dst_cache;
+
+        if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
+                sk->sk_dst_cache = NULL;
+                dst_release(dst);
+                return NULL;
+        }
+
+        return dst;
+}
+EXPORT_SYMBOL(__sk_dst_check);
+
+struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
+{
+        struct dst_entry *dst = sk_dst_get(sk);
+
+        if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
+                sk_dst_reset(sk);
+                dst_release(dst);
+                return NULL;
+        }
+
+        return dst;
+}
+EXPORT_SYMBOL(sk_dst_check);
+
 /*
  *      This is meant for all protocols to use and covers goings on
  *      at the socket level. Everything here is generic.