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Diffstat (limited to 'net/llc/llc_conn.c')
-rw-r--r--net/llc/llc_conn.c211
1 files changed, 122 insertions, 89 deletions
diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c
index 4c644bc..c761c15 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);
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