1 files changed, 122 insertions, 89 deletions

diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c
index 4c644bc70eae..c761c15da421 100644
--- a/net/llc/llc_conn.c
+++ b/net/llc/llc_conn.c
@@ -40,6 +40,11 @@ static struct llc_conn_state_trans *llc_qualify_conn_ev(struct sock *sk,
 /* Offset table on connection states transition diagram */
 static int llc_offset_table[NBR_CONN_STATES][NBR_CONN_EV];
 
+int sysctl_llc2_ack_timeout = LLC2_ACK_TIME * HZ;
+int sysctl_llc2_p_timeout = LLC2_P_TIME * HZ;
+int sysctl_llc2_rej_timeout = LLC2_REJ_TIME * HZ;
+int sysctl_llc2_busy_timeout = LLC2_BUSY_TIME * HZ;
+
 /**
  *      llc_conn_state_process - sends event to connection state machine
  *      @sk: connection
@@ -53,7 +58,7 @@ static int llc_offset_table[NBR_CONN_STATES][NBR_CONN_EV];
 int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
 {
         int rc;
-        struct llc_sock *llc = llc_sk(sk);
+        struct llc_sock *llc = llc_sk(skb->sk);
         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
         /*
@@ -63,13 +68,16 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
          */
         skb_get(skb);
         ev->ind_prim = ev->cfm_prim = 0;
-        rc = llc_conn_service(sk, skb); /* sending event to state machine */
-        if (rc) {
+        /*
+         * Send event to state machine
+         */
+        rc = llc_conn_service(skb->sk, skb);
+        if (unlikely(rc != 0)) {
                 printk(KERN_ERR "%s: llc_conn_service failed\n", __FUNCTION__);
                 goto out_kfree_skb;
         }
 
-        if (!ev->ind_prim && !ev->cfm_prim) {
+        if (unlikely(!ev->ind_prim && !ev->cfm_prim)) {
                 /* indicate or confirm not required */
                 /* XXX this is not very pretty, perhaps we should store
                  * XXX indicate/confirm-needed state in the llc_conn_state_ev
@@ -80,13 +88,13 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
                 goto out_skb_put;
         }
 
-        if (ev->ind_prim && ev->cfm_prim) /* Paranoia */
+        if (unlikely(ev->ind_prim && ev->cfm_prim)) /* Paranoia */
                 skb_get(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
                          */
@@ -95,13 +103,14 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
                         kfree_skb(skb);
                 }
                 break;
-        case LLC_CONN_PRIM: {
-                struct sock *parent = skb->sk;
-
-                skb->sk = sk;
-                skb_queue_tail(&parent->sk_receive_queue, skb);
-                sk->sk_state_change(parent);
-        }
+        case LLC_CONN_PRIM:
+                /*
+                 * Can't be sock_queue_rcv_skb, because we have to leave the
+                 * skb->sk pointing to the newly created struct sock in
+                 * llc_conn_handler. -acme
+                 */
+                skb_queue_tail(&sk->sk_receive_queue, skb);
+                sk->sk_state_change(sk);
                 break;
         case LLC_DISC_PRIM:
                 sock_hold(sk);
@@ -111,8 +120,8 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
                         sk->sk_socket->state  = SS_UNCONNECTED;
                         sk->sk_state          = TCP_CLOSE;
                         if (!sock_flag(sk, SOCK_DEAD)) {
-                                sk->sk_state_change(sk);
                                 sock_set_flag(sk, SOCK_DEAD);
+                                sk->sk_state_change(sk);
                         }
                 }
                 kfree_skb(skb);
@@ -465,7 +474,7 @@ static int llc_exec_conn_trans_actions(struct sock *sk,
 }
 
 /**
- *      llc_lookup_established - Finds connection for the remote/local sap/mac
+ *      __llc_lookup_established - Finds connection for the remote/local sap/mac
  *      @sap: SAP
  *      @daddr: address of remote LLC (MAC + SAP)
  *      @laddr: address of local LLC (MAC + SAP)
@@ -473,14 +482,16 @@ static int llc_exec_conn_trans_actions(struct sock *sk,
  *      Search connection list of the SAP and finds connection using the remote
  *      mac, remote sap, local mac, and local sap. Returns pointer for
  *      connection found, %NULL otherwise.
+ *      Caller has to make sure local_bh is disabled.
  */
-struct sock *llc_lookup_established(struct llc_sap *sap, struct llc_addr *daddr,
-                                    struct llc_addr *laddr)
+static struct sock *__llc_lookup_established(struct llc_sap *sap,
+                                             struct llc_addr *daddr,
+                                             struct llc_addr *laddr)
 {
         struct sock *rc;
         struct hlist_node *node;
 
-        read_lock_bh(&sap->sk_list.lock);
+        read_lock(&sap->sk_list.lock);
         sk_for_each(rc, node, &sap->sk_list.list) {
                 struct llc_sock *llc = llc_sk(rc);
 
@@ -494,10 +505,22 @@ struct sock *llc_lookup_established(struct llc_sap *sap, struct llc_addr *daddr,
         }
         rc = NULL;
 found:
-        read_unlock_bh(&sap->sk_list.lock);
+        read_unlock(&sap->sk_list.lock);
         return rc;
 }
 
+struct sock *llc_lookup_established(struct llc_sap *sap,
+                                    struct llc_addr *daddr,
+                                    struct llc_addr *laddr)
+{
+        struct sock *sk;
+
+        local_bh_disable();
+        sk = __llc_lookup_established(sap, daddr, laddr);
+        local_bh_enable();
+        return sk;
+}
+
 /**
  *      llc_lookup_listener - Finds listener for local MAC + SAP
  *      @sap: SAP
@@ -506,6 +529,7 @@ found:
  *      Search connection list of the SAP and finds connection listening on
  *      local mac, and local sap. Returns pointer for parent socket found,
  *      %NULL otherwise.
+ *      Caller has to make sure local_bh is disabled.
  */
 static struct sock *llc_lookup_listener(struct llc_sap *sap,
                                         struct llc_addr *laddr)
@@ -513,7 +537,7 @@ static struct sock *llc_lookup_listener(struct llc_sap *sap,
         struct sock *rc;
         struct hlist_node *node;
 
-        read_lock_bh(&sap->sk_list.lock);
+        read_lock(&sap->sk_list.lock);
         sk_for_each(rc, node, &sap->sk_list.list) {
                 struct llc_sock *llc = llc_sk(rc);
 
@@ -527,10 +551,19 @@ static struct sock *llc_lookup_listener(struct llc_sap *sap,
         }
         rc = NULL;
 found:
-        read_unlock_bh(&sap->sk_list.lock);
+        read_unlock(&sap->sk_list.lock);
         return rc;
 }
 
+static struct sock *__llc_lookup(struct llc_sap *sap,
+                                 struct llc_addr *daddr,
+                                 struct llc_addr *laddr)
+{
+        struct sock *sk = __llc_lookup_established(sap, daddr, laddr);
+
+        return sk ? : llc_lookup_listener(sap, laddr);
+}
+
 /**
  *      llc_data_accept_state - designates if in this state data can be sent.
  *      @state: state of connection.
@@ -544,14 +577,14 @@ u8 llc_data_accept_state(u8 state)
 }
 
 /**
- *      find_next_offset - finds offset for next category of transitions
+ *      llc_find_next_offset - finds offset for next category of transitions
  *      @state: state table.
  *      @offset: start offset.
  *
  *      Finds offset of next category of transitions in transition table.
  *      Returns the start index of next category.
  */
-static u16 find_next_offset(struct llc_conn_state *state, u16 offset)
+static u16 __init llc_find_next_offset(struct llc_conn_state *state, u16 offset)
 {
         u16 cnt = 0;
         struct llc_conn_state_trans **next_trans;
@@ -578,8 +611,8 @@ void __init llc_build_offset_table(void)
                 next_offset = 0;
                 for (ev_type = 0; ev_type < NBR_CONN_EV; ev_type++) {
                         llc_offset_table[state][ev_type] = next_offset;
-                        next_offset += find_next_offset(curr_state,
-                                                        next_offset) + 1;
+                        next_offset += llc_find_next_offset(curr_state,
+                                                            next_offset) + 1;
                 }
         }
 }
@@ -623,6 +656,7 @@ static int llc_find_offset(int state, int ev_type)
  */
 void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk)
 {
+        llc_sap_hold(sap);
         write_lock_bh(&sap->sk_list.lock);
         llc_sk(sk)->sap = sap;
         sk_add_node(sk, &sap->sk_list.list);
@@ -642,6 +676,7 @@ void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk)
         write_lock_bh(&sap->sk_list.lock);
         sk_del_node_init(sk);
         write_unlock_bh(&sap->sk_list.lock);
+        llc_sap_put(sap);
 }
 
 /**
@@ -654,15 +689,34 @@ void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk)
 static int llc_conn_rcv(struct sock* sk, struct sk_buff *skb)
 {
         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
-        struct llc_sock *llc = llc_sk(sk);
 
-        if (!llc->dev)
-                llc->dev = skb->dev;
         ev->type   = LLC_CONN_EV_TYPE_PDU;
         ev->reason = 0;
         return llc_conn_state_process(sk, skb);
 }
 
+static struct sock *llc_create_incoming_sock(struct sock *sk,
+                                             struct net_device *dev,
+                                             struct llc_addr *saddr,
+                                             struct llc_addr *daddr)
+{
+        struct sock *newsk = llc_sk_alloc(sk->sk_family, GFP_ATOMIC,
+                                          sk->sk_prot);
+        struct llc_sock *newllc, *llc = llc_sk(sk);
+
+        if (!newsk)
+                goto out;
+        newllc = llc_sk(newsk);
+        memcpy(&newllc->laddr, daddr, sizeof(newllc->laddr));
+        memcpy(&newllc->daddr, saddr, sizeof(newllc->daddr));
+        newllc->dev = dev;
+        dev_hold(dev);
+        llc_sap_add_socket(llc->sap, newsk);
+        llc_sap_hold(llc->sap);
+out:
+        return newsk;
+}
+
 void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb)
 {
         struct llc_addr saddr, daddr;
@@ -673,35 +727,35 @@ void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb)
         llc_pdu_decode_da(skb, daddr.mac);
         llc_pdu_decode_dsap(skb, &daddr.lsap);
 
-        sk = llc_lookup_established(sap, &saddr, &daddr);
-        if (!sk) {
+        sk = __llc_lookup(sap, &saddr, &daddr);
+        if (!sk)
+                goto drop;
+
+        bh_lock_sock(sk);
+        /*
+         * This has to be done here and not at the upper layer ->accept
+         * method because of the way the PROCOM state machine works:
+         * it needs to set several state variables (see, for instance,
+         * llc_adm_actions_2 in net/llc/llc_c_st.c) and send a packet to
+         * the originator of the new connection, and this state has to be
+         * in the newly created struct sock private area. -acme
+         */
+        if (unlikely(sk->sk_state == TCP_LISTEN)) {
+                struct sock *newsk = llc_create_incoming_sock(sk, skb->dev,
+                                                              &saddr, &daddr);
+                if (!newsk)
+                        goto drop_unlock;
+                skb_set_owner_r(skb, newsk);
+        } else {
                 /*
-                 * Didn't find an active connection; verify if there
-                 * is a listening socket for this llc addr
+                 * Can't be skb_set_owner_r, this will be done at the
+                 * llc_conn_state_process function, later on, when we will use
+                 * skb_queue_rcv_skb to send it to upper layers, this is
+                 * another trick required to cope with how the PROCOM state
+                 * machine works. -acme
                  */
-                struct llc_sock *llc;
-                struct sock *parent = llc_lookup_listener(sap, &daddr);
-
-                if (!parent) {
-                        dprintk("llc_lookup_listener failed!\n");
-                        goto drop;
-                }
-
-                sk = llc_sk_alloc(parent->sk_family, GFP_ATOMIC, parent->sk_prot);
-                if (!sk) {
-                        sock_put(parent);
-                        goto drop;
-                }
-                llc = llc_sk(sk);
-                memcpy(&llc->laddr, &daddr, sizeof(llc->laddr));
-                memcpy(&llc->daddr, &saddr, sizeof(llc->daddr));
-                llc_sap_add_socket(sap, sk);
-                sock_hold(sk);
-                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);
         else {
@@ -709,11 +763,16 @@ void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb)
                 llc_set_backlog_type(skb, LLC_PACKET);
                 sk_add_backlog(sk, skb);
         }
+out:
         bh_unlock_sock(sk);
         sock_put(sk);
         return;
 drop:
         kfree_skb(skb);
+        return;
+drop_unlock:
+        kfree_skb(skb);
+        goto out;
 }
 
 #undef LLC_REFCNT_DEBUG
@@ -722,32 +781,6 @@ static atomic_t llc_sock_nr;
 #endif
 
 /**
- *      llc_release_sockets - releases all sockets in a sap
- *      @sap: sap to release its sockets
- *
- *      Releases all connections of a sap. Returns 0 if all actions complete
- *      successfully, nonzero otherwise
- */
-int llc_release_sockets(struct llc_sap *sap)
-{
-        int rc = 0;
-        struct sock *sk;
-        struct hlist_node *node;
-
-        write_lock_bh(&sap->sk_list.lock);
-
-        sk_for_each(sk, node, &sap->sk_list.list) {
-                llc_sk(sk)->state = LLC_CONN_STATE_TEMP;
-
-                if (llc_send_disc(sk))
-                        rc = 1;
-        }
-
-        write_unlock_bh(&sap->sk_list.lock);
-        return rc;
-}
-
-/**
  *      llc_backlog_rcv - Processes rx frames and expired timers.
  *      @sk: LLC sock (p8022 connection)
  *      @skb: queued rx frame or event
@@ -762,14 +795,14 @@ static int llc_backlog_rcv(struct sock *sk, struct sk_buff *skb)
         int rc = 0;
         struct llc_sock *llc = llc_sk(sk);
 
-        if (llc_backlog_type(skb) == LLC_PACKET) {
-                if (llc->state > 1) /* not closed */
+        if (likely(llc_backlog_type(skb) == LLC_PACKET)) {
+                if (likely(llc->state > 1)) /* not closed */
                         rc = llc_conn_rcv(sk, skb);
                 else
                         goto out_kfree_skb;
         } else if (llc_backlog_type(skb) == LLC_EVENT) {
                 /* timer expiration event */
-                if (llc->state > 1)  /* not closed */
+                if (likely(llc->state > 1))  /* not closed */
                         rc = llc_conn_state_process(sk, skb);
                 else
                         goto out_kfree_skb;
@@ -799,22 +832,22 @@ static void llc_sk_init(struct sock* sk)
         llc->dec_step = llc->connect_step = 1;
 
         init_timer(&llc->ack_timer.timer);
-        llc->ack_timer.expire         = LLC_ACK_TIME;
+        llc->ack_timer.expire         = sysctl_llc2_ack_timeout;
         llc->ack_timer.timer.data     = (unsigned long)sk;
         llc->ack_timer.timer.function = llc_conn_ack_tmr_cb;
 
         init_timer(&llc->pf_cycle_timer.timer);
-        llc->pf_cycle_timer.expire         = LLC_P_TIME;
+        llc->pf_cycle_timer.expire         = sysctl_llc2_p_timeout;
         llc->pf_cycle_timer.timer.data     = (unsigned long)sk;
         llc->pf_cycle_timer.timer.function = llc_conn_pf_cycle_tmr_cb;
 
         init_timer(&llc->rej_sent_timer.timer);
-        llc->rej_sent_timer.expire         = LLC_REJ_TIME;
+        llc->rej_sent_timer.expire         = sysctl_llc2_rej_timeout;
         llc->rej_sent_timer.timer.data     = (unsigned long)sk;
         llc->rej_sent_timer.timer.function = llc_conn_rej_tmr_cb;
 
         init_timer(&llc->busy_state_timer.timer);
-        llc->busy_state_timer.expire         = LLC_BUSY_TIME;
+        llc->busy_state_timer.expire         = sysctl_llc2_busy_timeout;
         llc->busy_state_timer.timer.data     = (unsigned long)sk;
         llc->busy_state_timer.timer.function = llc_conn_busy_tmr_cb;
 
@@ -834,7 +867,7 @@ static void llc_sk_init(struct sock* sk)
  *      Allocates a LLC sock and initializes it. Returns the new LLC sock
  *      or %NULL if there's no memory available for one
  */
-struct sock *llc_sk_alloc(int family, int priority, struct proto *prot)
+struct sock *llc_sk_alloc(int family, gfp_t priority, struct proto *prot)
 {
         struct sock *sk = sk_alloc(family, priority, prot, 1);