[LLC]: Do better struct sock accounting on skbs

Signed-off-by: Jochen Friedrich <jochen@scram.de>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

4 files changed, 14 insertions, 12 deletions

diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index f536369cdb52..ad9aad807aa8 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -628,7 +628,6 @@ static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags)
         /* put original socket back into a clean listen state. */
         sk->sk_state = TCP_LISTEN;
         sk->sk_ack_backlog--;
-        skb->sk = NULL;
         dprintk("%s: ok success on %02X, client on %02X\n", __FUNCTION__,
                 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
 frees:
@@ -740,7 +739,6 @@ static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock,
         lock_sock(sk);
         if (!skb)
                 goto release;
-        skb->sk       = sk;
         skb->dev      = llc->dev;
         skb->protocol = llc_proto_type(addr->sllc_arphrd);
         skb_reserve(skb, hdrlen); 
diff --git a/net/llc/llc_c_ac.c b/net/llc/llc_c_ac.c
index 9d9b6c8aeb44..c1e75103189a 100644
--- a/net/llc/llc_c_ac.c
+++ b/net/llc/llc_c_ac.c
@@ -1335,7 +1335,7 @@ static void llc_conn_tmr_common_cb(unsigned long timeout_data, u8 type)
         if (skb) {
                 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
-                skb->sk  = sk;
+                skb_set_owner_r(skb, sk);
                 ev->type = type;
                 llc_process_tmr_ev(sk, skb);
         }
diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c
index d3783f8ee481..9f0e10e0978d 100644
--- a/net/llc/llc_conn.c
+++ b/net/llc/llc_conn.c
@@ -90,8 +90,8 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
 
         switch (ev->ind_prim) {
         case LLC_DATA_PRIM:
-                llc_save_primitive(skb, LLC_DATA_PRIM);
-                if (sock_queue_rcv_skb(sk, skb)) {
+                llc_save_primitive(sk, skb, LLC_DATA_PRIM);
+                if (unlikely(sock_queue_rcv_skb(sk, skb))) {
                         /*
                          * shouldn't happen
                          */
@@ -103,6 +103,11 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
         case LLC_CONN_PRIM: {
                 struct sock *parent = skb->sk;
 
+                skb_orphan(skb);
+                /*
+                 * Set the skb->sk to the new struct sock, so that at accept
+                 * type the upper layer can get the newly created struct sock.
+                 */
                 skb->sk = sk;
                 skb_queue_tail(&parent->sk_receive_queue, skb);
                 sk->sk_state_change(parent);
@@ -702,10 +707,9 @@ void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb)
                 memcpy(&llc->daddr, &saddr, sizeof(llc->daddr));
                 llc_sap_add_socket(sap, sk);
                 sock_hold(sk);
+                skb_set_owner_r(skb, parent);
                 sock_put(parent);
-                skb->sk = parent;
-        } else
-                skb->sk = sk;
+        }
         bh_lock_sock(sk);
         if (!sock_owned_by_user(sk))
                 llc_conn_rcv(sk, skb);
diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c
index 0adaa289bf0a..9f064b3a4335 100644
--- a/net/llc/llc_sap.c
+++ b/net/llc/llc_sap.c
@@ -45,12 +45,12 @@ struct sk_buff *llc_alloc_frame(struct net_device *dev)
         return skb;
 }
 
-void llc_save_primitive(struct sk_buff* skb, u8 prim)
+void llc_save_primitive(struct sock *sk, struct sk_buff* skb, u8 prim)
 {
         struct sockaddr_llc *addr = llc_ui_skb_cb(skb);
 
        /* save primitive for use by the user. */
-        addr->sllc_family = skb->sk->sk_family;
+        addr->sllc_family = sk->sk_family;
         addr->sllc_arphrd = skb->dev->type;
         addr->sllc_test   = prim == LLC_TEST_PRIM;
         addr->sllc_xid    = prim == LLC_XID_PRIM;
@@ -190,7 +190,7 @@ static void llc_sap_state_process(struct llc_sap *sap, struct sk_buff *skb)
                 if (skb->sk->sk_state == TCP_LISTEN)
                         kfree_skb(skb);
                 else {
-                        llc_save_primitive(skb, ev->prim);
+                        llc_save_primitive(skb->sk, skb, ev->prim);
 
                         /* queue skb to the user. */
                         if (sock_queue_rcv_skb(skb->sk, skb))
@@ -309,7 +309,7 @@ void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb)
 
         sk = llc_lookup_dgram(sap, &laddr);
         if (sk) {
-                skb->sk = sk;
+                skb_set_owner_r(skb, sk);
                 llc_sap_rcv(sap, skb);
                 sock_put(sk);
         } else