summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--Documentation/networking/rxrpc.txt196
-rw-r--r--include/net/af_rxrpc.h44
-rw-r--r--include/rxrpc/packet.h12
-rw-r--r--net/rxrpc/af_rxrpc.c141
-rw-r--r--net/rxrpc/ar-accept.c119
-rw-r--r--net/rxrpc/ar-ack.c10
-rw-r--r--net/rxrpc/ar-call.c75
-rw-r--r--net/rxrpc/ar-connection.c28
-rw-r--r--net/rxrpc/ar-connevent.c20
-rw-r--r--net/rxrpc/ar-error.c6
-rw-r--r--net/rxrpc/ar-input.c60
-rw-r--r--net/rxrpc/ar-internal.h44
-rw-r--r--net/rxrpc/ar-local.c2
-rw-r--r--net/rxrpc/ar-output.c84
-rw-r--r--net/rxrpc/ar-peer.c2
-rw-r--r--net/rxrpc/ar-recvmsg.c75
-rw-r--r--net/rxrpc/ar-skbuff.c16
-rw-r--r--net/rxrpc/ar-transport.c8
18 files changed, 813 insertions, 129 deletions
diff --git a/Documentation/networking/rxrpc.txt b/Documentation/networking/rxrpc.txt
index fb809b738a0d..cae231b1c134 100644
--- a/Documentation/networking/rxrpc.txt
+++ b/Documentation/networking/rxrpc.txt
@@ -25,6 +25,8 @@ Contents of this document:
(*) Example server usage.
+ (*) AF_RXRPC kernel interface.
+
========
OVERVIEW
@@ -661,3 +663,197 @@ A server would be set up to accept operations in the following manner:
Note that all the communications for a particular service take place through
the one server socket, using control messages on sendmsg() and recvmsg() to
determine the call affected.
+
+
+=========================
+AF_RXRPC KERNEL INTERFACE
+=========================
+
+The AF_RXRPC module also provides an interface for use by in-kernel utilities
+such as the AFS filesystem. This permits such a utility to:
+
+ (1) Use different keys directly on individual client calls on one socket
+ rather than having to open a whole slew of sockets, one for each key it
+ might want to use.
+
+ (2) Avoid having RxRPC call request_key() at the point of issue of a call or
+ opening of a socket. Instead the utility is responsible for requesting a
+ key at the appropriate point. AFS, for instance, would do this during VFS
+ operations such as open() or unlink(). The key is then handed through
+ when the call is initiated.
+
+ (3) Request the use of something other than GFP_KERNEL to allocate memory.
+
+ (4) Avoid the overhead of using the recvmsg() call. RxRPC messages can be
+ intercepted before they get put into the socket Rx queue and the socket
+ buffers manipulated directly.
+
+To use the RxRPC facility, a kernel utility must still open an AF_RXRPC socket,
+bind an addess as appropriate and listen if it's to be a server socket, but
+then it passes this to the kernel interface functions.
+
+The kernel interface functions are as follows:
+
+ (*) Begin a new client call.
+
+ struct rxrpc_call *
+ rxrpc_kernel_begin_call(struct socket *sock,
+ struct sockaddr_rxrpc *srx,
+ struct key *key,
+ unsigned long user_call_ID,
+ gfp_t gfp);
+
+ This allocates the infrastructure to make a new RxRPC call and assigns
+ call and connection numbers. The call will be made on the UDP port that
+ the socket is bound to. The call will go to the destination address of a
+ connected client socket unless an alternative is supplied (srx is
+ non-NULL).
+
+ If a key is supplied then this will be used to secure the call instead of
+ the key bound to the socket with the RXRPC_SECURITY_KEY sockopt. Calls
+ secured in this way will still share connections if at all possible.
+
+ The user_call_ID is equivalent to that supplied to sendmsg() in the
+ control data buffer. It is entirely feasible to use this to point to a
+ kernel data structure.
+
+ If this function is successful, an opaque reference to the RxRPC call is
+ returned. The caller now holds a reference on this and it must be
+ properly ended.
+
+ (*) End a client call.
+
+ void rxrpc_kernel_end_call(struct rxrpc_call *call);
+
+ This is used to end a previously begun call. The user_call_ID is expunged
+ from AF_RXRPC's knowledge and will not be seen again in association with
+ the specified call.
+
+ (*) Send data through a call.
+
+ int rxrpc_kernel_send_data(struct rxrpc_call *call, struct msghdr *msg,
+ size_t len);
+
+ This is used to supply either the request part of a client call or the
+ reply part of a server call. msg.msg_iovlen and msg.msg_iov specify the
+ data buffers to be used. msg_iov may not be NULL and must point
+ exclusively to in-kernel virtual addresses. msg.msg_flags may be given
+ MSG_MORE if there will be subsequent data sends for this call.
+
+ The msg must not specify a destination address, control data or any flags
+ other than MSG_MORE. len is the total amount of data to transmit.
+
+ (*) Abort a call.
+
+ void rxrpc_kernel_abort_call(struct rxrpc_call *call, u32 abort_code);
+
+ This is used to abort a call if it's still in an abortable state. The
+ abort code specified will be placed in the ABORT message sent.
+
+ (*) Intercept received RxRPC messages.
+
+ typedef void (*rxrpc_interceptor_t)(struct sock *sk,
+ unsigned long user_call_ID,
+ struct sk_buff *skb);
+
+ void
+ rxrpc_kernel_intercept_rx_messages(struct socket *sock,
+ rxrpc_interceptor_t interceptor);
+
+ This installs an interceptor function on the specified AF_RXRPC socket.
+ All messages that would otherwise wind up in the socket's Rx queue are
+ then diverted to this function. Note that care must be taken to process
+ the messages in the right order to maintain DATA message sequentiality.
+
+ The interceptor function itself is provided with the address of the socket
+ and handling the incoming message, the ID assigned by the kernel utility
+ to the call and the socket buffer containing the message.
+
+ The skb->mark field indicates the type of message:
+
+ MARK MEANING
+ =============================== =======================================
+ RXRPC_SKB_MARK_DATA Data message
+ RXRPC_SKB_MARK_FINAL_ACK Final ACK received for an incoming call
+ RXRPC_SKB_MARK_BUSY Client call rejected as server busy
+ RXRPC_SKB_MARK_REMOTE_ABORT Call aborted by peer
+ RXRPC_SKB_MARK_NET_ERROR Network error detected
+ RXRPC_SKB_MARK_LOCAL_ERROR Local error encountered
+ RXRPC_SKB_MARK_NEW_CALL New incoming call awaiting acceptance
+
+ The remote abort message can be probed with rxrpc_kernel_get_abort_code().
+ The two error messages can be probed with rxrpc_kernel_get_error_number().
+ A new call can be accepted with rxrpc_kernel_accept_call().
+
+ Data messages can have their contents extracted with the usual bunch of
+ socket buffer manipulation functions. A data message can be determined to
+ be the last one in a sequence with rxrpc_kernel_is_data_last(). When a
+ data message has been used up, rxrpc_kernel_data_delivered() should be
+ called on it..
+
+ Non-data messages should be handled to rxrpc_kernel_free_skb() to dispose
+ of. It is possible to get extra refs on all types of message for later
+ freeing, but this may pin the state of a call until the message is finally
+ freed.
+
+ (*) Accept an incoming call.
+
+ struct rxrpc_call *
+ rxrpc_kernel_accept_call(struct socket *sock,
+ unsigned long user_call_ID);
+
+ This is used to accept an incoming call and to assign it a call ID. This
+ function is similar to rxrpc_kernel_begin_call() and calls accepted must
+ be ended in the same way.
+
+ If this function is successful, an opaque reference to the RxRPC call is
+ returned. The caller now holds a reference on this and it must be
+ properly ended.
+
+ (*) Reject an incoming call.
+
+ int rxrpc_kernel_reject_call(struct socket *sock);
+
+ This is used to reject the first incoming call on the socket's queue with
+ a BUSY message. -ENODATA is returned if there were no incoming calls.
+ Other errors may be returned if the call had been aborted (-ECONNABORTED)
+ or had timed out (-ETIME).
+
+ (*) Record the delivery of a data message and free it.
+
+ void rxrpc_kernel_data_delivered(struct sk_buff *skb);
+
+ This is used to record a data message as having been delivered and to
+ update the ACK state for the call. The socket buffer will be freed.
+
+ (*) Free a message.
+
+ void rxrpc_kernel_free_skb(struct sk_buff *skb);
+
+ This is used to free a non-DATA socket buffer intercepted from an AF_RXRPC
+ socket.
+
+ (*) Determine if a data message is the last one on a call.
+
+ bool rxrpc_kernel_is_data_last(struct sk_buff *skb);
+
+ This is used to determine if a socket buffer holds the last data message
+ to be received for a call (true will be returned if it does, false
+ if not).
+
+ The data message will be part of the reply on a client call and the
+ request on an incoming call. In the latter case there will be more
+ messages, but in the former case there will not.
+
+ (*) Get the abort code from an abort message.
+
+ u32 rxrpc_kernel_get_abort_code(struct sk_buff *skb);
+
+ This is used to extract the abort code from a remote abort message.
+
+ (*) Get the error number from a local or network error message.
+
+ int rxrpc_kernel_get_error_number(struct sk_buff *skb);
+
+ This is used to extract the error number from a message indicating either
+ a local error occurred or a network error occurred.
diff --git a/include/net/af_rxrpc.h b/include/net/af_rxrpc.h
index b01ca2589d69..00c2eaa07c25 100644
--- a/include/net/af_rxrpc.h
+++ b/include/net/af_rxrpc.h
@@ -1,6 +1,6 @@
-/* RxRPC definitions
+/* RxRPC kernel service interface definitions
*
- * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
@@ -12,6 +12,46 @@
#ifndef _NET_RXRPC_H
#define _NET_RXRPC_H
+#ifdef __KERNEL__
+
#include <linux/rxrpc.h>
+struct rxrpc_call;
+
+/*
+ * the mark applied to socket buffers that may be intercepted
+ */
+enum {
+ RXRPC_SKB_MARK_DATA, /* data message */
+ RXRPC_SKB_MARK_FINAL_ACK, /* final ACK received message */
+ RXRPC_SKB_MARK_BUSY, /* server busy message */
+ RXRPC_SKB_MARK_REMOTE_ABORT, /* remote abort message */
+ RXRPC_SKB_MARK_NET_ERROR, /* network error message */
+ RXRPC_SKB_MARK_LOCAL_ERROR, /* local error message */
+ RXRPC_SKB_MARK_NEW_CALL, /* local error message */
+};
+
+typedef void (*rxrpc_interceptor_t)(struct sock *, unsigned long,
+ struct sk_buff *);
+extern void rxrpc_kernel_intercept_rx_messages(struct socket *,
+ rxrpc_interceptor_t);
+extern struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *,
+ struct sockaddr_rxrpc *,
+ struct key *,
+ unsigned long,
+ gfp_t);
+extern int rxrpc_kernel_send_data(struct rxrpc_call *, struct msghdr *,
+ size_t);
+extern void rxrpc_kernel_abort_call(struct rxrpc_call *, u32);
+extern void rxrpc_kernel_end_call(struct rxrpc_call *);
+extern bool rxrpc_kernel_is_data_last(struct sk_buff *);
+extern u32 rxrpc_kernel_get_abort_code(struct sk_buff *);
+extern int rxrpc_kernel_get_error_number(struct sk_buff *);
+extern void rxrpc_kernel_data_delivered(struct sk_buff *);
+extern void rxrpc_kernel_free_skb(struct sk_buff *);
+extern struct rxrpc_call *rxrpc_kernel_accept_call(struct socket *,
+ unsigned long);
+extern int rxrpc_kernel_reject_call(struct socket *);
+
+#endif /* __KERNEL__ */
#endif /* _NET_RXRPC_H */
diff --git a/include/rxrpc/packet.h b/include/rxrpc/packet.h
index 452a9bb02d48..09b11a1e8d46 100644
--- a/include/rxrpc/packet.h
+++ b/include/rxrpc/packet.h
@@ -186,6 +186,18 @@ struct rxkad_response {
#define RX_DEBUGI_BADTYPE -8 /* bad debugging packet type */
/*
+ * (un)marshalling abort codes (rxgen)
+ */
+#define RXGEN_CC_MARSHAL -450
+#define RXGEN_CC_UNMARSHAL -451
+#define RXGEN_SS_MARSHAL -452
+#define RXGEN_SS_UNMARSHAL -453
+#define RXGEN_DECODE -454
+#define RXGEN_OPCODE -455
+#define RXGEN_SS_XDRFREE -456
+#define RXGEN_CC_XDRFREE -457
+
+/*
* Rx kerberos security abort codes
* - unfortunately we have no generalised security abort codes to say things
* like "unsupported security", so we have to use these instead and hope the
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index bfa8822e2286..2c57df9c131b 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -41,6 +41,8 @@ atomic_t rxrpc_debug_id;
/* count of skbs currently in use */
atomic_t rxrpc_n_skbs;
+struct workqueue_struct *rxrpc_workqueue;
+
static void rxrpc_sock_destructor(struct sock *);
/*
@@ -214,7 +216,8 @@ static int rxrpc_listen(struct socket *sock, int backlog)
*/
static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock,
struct sockaddr *addr,
- int addr_len, int flags)
+ int addr_len, int flags,
+ gfp_t gfp)
{
struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
struct rxrpc_transport *trans;
@@ -232,17 +235,129 @@ static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock,
return ERR_PTR(-EAFNOSUPPORT);
/* find a remote transport endpoint from the local one */
- peer = rxrpc_get_peer(srx, GFP_KERNEL);
+ peer = rxrpc_get_peer(srx, gfp);
if (IS_ERR(peer))
return ERR_PTR(PTR_ERR(peer));
/* find a transport */
- trans = rxrpc_get_transport(rx->local, peer, GFP_KERNEL);
+ trans = rxrpc_get_transport(rx->local, peer, gfp);
rxrpc_put_peer(peer);
_leave(" = %p", trans);
return trans;
}
+/**
+ * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
+ * @sock: The socket on which to make the call
+ * @srx: The address of the peer to contact (defaults to socket setting)
+ * @key: The security context to use (defaults to socket setting)
+ * @user_call_ID: The ID to use
+ *
+ * Allow a kernel service to begin a call on the nominated socket. This just
+ * sets up all the internal tracking structures and allocates connection and
+ * call IDs as appropriate. The call to be used is returned.
+ *
+ * The default socket destination address and security may be overridden by
+ * supplying @srx and @key.
+ */
+struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
+ struct sockaddr_rxrpc *srx,
+ struct key *key,
+ unsigned long user_call_ID,
+ gfp_t gfp)
+{
+ struct rxrpc_conn_bundle *bundle;
+ struct rxrpc_transport *trans;
+ struct rxrpc_call *call;
+ struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
+ __be16 service_id;
+
+ _enter(",,%x,%lx", key_serial(key), user_call_ID);
+
+ lock_sock(&rx->sk);
+
+ if (srx) {
+ trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx,
+ sizeof(*srx), 0, gfp);
+ if (IS_ERR(trans)) {
+ call = ERR_PTR(PTR_ERR(trans));
+ trans = NULL;
+ goto out;
+ }
+ } else {
+ trans = rx->trans;
+ if (!trans) {
+ call = ERR_PTR(-ENOTCONN);
+ goto out;
+ }
+ atomic_inc(&trans->usage);
+ }
+
+ service_id = rx->service_id;
+ if (srx)
+ service_id = htons(srx->srx_service);
+
+ if (!key)
+ key = rx->key;
+ if (key && !key->payload.data)
+ key = NULL; /* a no-security key */
+
+ bundle = rxrpc_get_bundle(rx, trans, key, service_id, gfp);
+ if (IS_ERR(bundle)) {
+ call = ERR_PTR(PTR_ERR(bundle));
+ goto out;
+ }
+
+ call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true,
+ gfp);
+ rxrpc_put_bundle(trans, bundle);
+out:
+ rxrpc_put_transport(trans);
+ release_sock(&rx->sk);
+ _leave(" = %p", call);
+ return call;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_begin_call);
+
+/**
+ * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
+ * @call: The call to end
+ *
+ * Allow a kernel service to end a call it was using. The call must be
+ * complete before this is called (the call should be aborted if necessary).
+ */
+void rxrpc_kernel_end_call(struct rxrpc_call *call)
+{
+ _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
+ rxrpc_remove_user_ID(call->socket, call);
+ rxrpc_put_call(call);
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_end_call);
+
+/**
+ * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
+ * @sock: The socket to intercept received messages on
+ * @interceptor: The function to pass the messages to
+ *
+ * Allow a kernel service to intercept messages heading for the Rx queue on an
+ * RxRPC socket. They get passed to the specified function instead.
+ * @interceptor should free the socket buffers it is given. @interceptor is
+ * called with the socket receive queue spinlock held and softirqs disabled -
+ * this ensures that the messages will be delivered in the right order.
+ */
+void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
+ rxrpc_interceptor_t interceptor)
+{
+ struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
+
+ _enter("");
+ rx->interceptor = interceptor;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
+
/*
* connect an RxRPC socket
* - this just targets it at a specific destination; no actual connection
@@ -294,7 +409,8 @@ static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
return -EBUSY; /* server sockets can't connect as well */
}
- trans = rxrpc_name_to_transport(sock, addr, addr_len, flags);
+ trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
+ GFP_KERNEL);
if (IS_ERR(trans)) {
release_sock(&rx->sk);
_leave(" = %ld", PTR_ERR(trans));
@@ -344,7 +460,7 @@ static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock,
if (m->msg_name) {
ret = -EISCONN;
trans = rxrpc_name_to_transport(sock, m->msg_name,
- m->msg_namelen, 0);
+ m->msg_namelen, 0, GFP_KERNEL);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
trans = NULL;
@@ -576,7 +692,7 @@ static int rxrpc_release_sock(struct sock *sk)
/* try to flush out this socket */
rxrpc_release_calls_on_socket(rx);
- flush_scheduled_work();
+ flush_workqueue(rxrpc_workqueue);
rxrpc_purge_queue(&sk->sk_receive_queue);
if (rx->conn) {
@@ -673,15 +789,21 @@ static int __init af_rxrpc_init(void)
rxrpc_epoch = htonl(xtime.tv_sec);
+ ret = -ENOMEM;
rxrpc_call_jar = kmem_cache_create(
"rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
SLAB_HWCACHE_ALIGN, NULL, NULL);
if (!rxrpc_call_jar) {
printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
- ret = -ENOMEM;
goto error_call_jar;
}
+ rxrpc_workqueue = create_workqueue("krxrpcd");
+ if (!rxrpc_workqueue) {
+ printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n");
+ goto error_work_queue;
+ }
+
ret = proto_register(&rxrpc_proto, 1);
if (ret < 0) {
printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
@@ -719,6 +841,8 @@ error_key_type:
error_sock:
proto_unregister(&rxrpc_proto);
error_proto:
+ destroy_workqueue(rxrpc_workqueue);
+error_work_queue:
kmem_cache_destroy(rxrpc_call_jar);
error_call_jar:
return ret;
@@ -743,9 +867,10 @@ static void __exit af_rxrpc_exit(void)
ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
_debug("flush scheduled work");
- flush_scheduled_work();
+ flush_workqueue(rxrpc_workqueue);
proc_net_remove("rxrpc_conns");
proc_net_remove("rxrpc_calls");
+ destroy_workqueue(rxrpc_workqueue);
kmem_cache_destroy(rxrpc_call_jar);
_leave("");
}
diff --git a/net/rxrpc/ar-accept.c b/net/rxrpc/ar-accept.c
index e7af780cd6f9..92a87fde8bfe 100644
--- a/net/rxrpc/ar-accept.c
+++ b/net/rxrpc/ar-accept.c
@@ -139,7 +139,7 @@ static int rxrpc_accept_incoming_call(struct rxrpc_local *local,
call->conn->state = RXRPC_CONN_SERVER_CHALLENGING;
atomic_inc(&call->conn->usage);
set_bit(RXRPC_CONN_CHALLENGE, &call->conn->events);
- schedule_work(&call->conn->processor);
+ rxrpc_queue_conn(call->conn);
} else {
_debug("conn ready");
call->state = RXRPC_CALL_SERVER_ACCEPTING;
@@ -183,7 +183,7 @@ invalid_service:
if (!test_bit(RXRPC_CALL_RELEASE, &call->flags) &&
!test_and_set_bit(RXRPC_CALL_RELEASE, &call->events)) {
rxrpc_get_call(call);
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
}
read_unlock_bh(&call->state_lock);
rxrpc_put_call(call);
@@ -310,7 +310,8 @@ security_mismatch:
* handle acceptance of a call by userspace
* - assign the user call ID to the call at the front of the queue
*/
-int rxrpc_accept_call(struct rxrpc_sock *rx, unsigned long user_call_ID)
+struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *rx,
+ unsigned long user_call_ID)
{
struct rxrpc_call *call;
struct rb_node *parent, **pp;
@@ -374,12 +375,76 @@ int rxrpc_accept_call(struct rxrpc_sock *rx, unsigned long user_call_ID)
BUG();
if (test_and_set_bit(RXRPC_CALL_ACCEPTED, &call->events))
BUG();
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
+ rxrpc_get_call(call);
write_unlock_bh(&call->state_lock);
write_unlock(&rx->call_lock);
- _leave(" = 0");
- return 0;
+ _leave(" = %p{%d}", call, call->debug_id);
+ return call;
+
+ /* if the call is already dying or dead, then we leave the socket's ref
+ * on it to be released by rxrpc_dead_call_expired() as induced by
+ * rxrpc_release_call() */
+out_release:
+ _debug("release %p", call);
+ if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
+ !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
+ rxrpc_queue_call(call);
+out_discard:
+ write_unlock_bh(&call->state_lock);
+ _debug("discard %p", call);
+out:
+ write_unlock(&rx->call_lock);
+ _leave(" = %d", ret);
+ return ERR_PTR(ret);
+}
+
+/*
+ * handle rejectance of a call by userspace
+ * - reject the call at the front of the queue
+ */
+int rxrpc_reject_call(struct rxrpc_sock *rx)
+{
+ struct rxrpc_call *call;
+ int ret;
+
+ _enter("");
+
+ ASSERT(!irqs_disabled());
+
+ write_lock(&rx->call_lock);
+
+ ret = -ENODATA;
+ if (list_empty(&rx->acceptq))
+ goto out;
+
+ /* dequeue the first call and check it's still valid */
+ call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link);
+ list_del_init(&call->accept_link);
+ sk_acceptq_removed(&rx->sk);
+
+ write_lock_bh(&call->state_lock);
+ switch (call->state) {
+ case RXRPC_CALL_SERVER_ACCEPTING:
+ call->state = RXRPC_CALL_SERVER_BUSY;
+ if (test_and_set_bit(RXRPC_CALL_REJECT_BUSY, &call->events))
+ rxrpc_queue_call(call);
+ ret = 0;
+ goto out_release;
+ case RXRPC_CALL_REMOTELY_ABORTED:
+ case RXRPC_CALL_LOCALLY_ABORTED:
+ ret = -ECONNABORTED;
+ goto out_release;
+ case RXRPC_CALL_NETWORK_ERROR:
+ ret = call->conn->error;
+ goto out_release;
+ case RXRPC_CALL_DEAD:
+ ret = -ETIME;
+ goto out_discard;
+ default:
+ BUG();
+ }
/* if the call is already dying or dead, then we leave the socket's ref
* on it to be released by rxrpc_dead_call_expired() as induced by
@@ -388,7 +453,7 @@ out_release:
_debug("release %p", call);
if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
!test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
out_discard:
write_unlock_bh(&call->state_lock);
_debug("discard %p", call);
@@ -397,3 +462,43 @@ out:
_leave(" = %d", ret);
return ret;
}
+
+/**
+ * rxrpc_kernel_accept_call - Allow a kernel service to accept an incoming call
+ * @sock: The socket on which the impending call is waiting
+ * @user_call_ID: The tag to attach to the call
+ *
+ * Allow a kernel service to accept an incoming call, assuming the incoming
+ * call is still valid.
+ */
+struct rxrpc_call *rxrpc_kernel_accept_call(struct socket *sock,
+ unsigned long user_call_ID)
+{
+ struct rxrpc_call *call;
+
+ _enter(",%lx", user_call_ID);
+ call = rxrpc_accept_call(rxrpc_sk(sock->sk), user_call_ID);
+ _leave(" = %p", call);
+ return call;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_accept_call);
+
+/**
+ * rxrpc_kernel_reject_call - Allow a kernel service to reject an incoming call
+ * @sock: The socket on which the impending call is waiting
+ *
+ * Allow a kernel service to reject an incoming call with a BUSY message,
+ * assuming the incoming call is still valid.
+ */
+int rxrpc_kernel_reject_call(struct socket *sock)
+{
+ int ret;
+
+ _enter("");
+ ret = rxrpc_reject_call(rxrpc_sk(sock->sk));
+ _leave(" = %d", ret);
+ return ret;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_reject_call);
diff --git a/net/rxrpc/ar-ack.c b/net/rxrpc/ar-ack.c
index 8f7764eca96c..fc07a926df56 100644
--- a/net/rxrpc/ar-ack.c
+++ b/net/rxrpc/ar-ack.c
@@ -113,7 +113,7 @@ cancel_timer:
read_lock_bh(&call->state_lock);
if (call->state <= RXRPC_CALL_COMPLETE &&
!test_and_set_bit(RXRPC_CALL_ACK, &call->events))
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
read_unlock_bh(&call->state_lock);
}
@@ -1166,7 +1166,7 @@ send_message_2:
_debug("sendmsg failed: %d", ret);
read_lock_bh(&call->state_lock);
if (call->state < RXRPC_CALL_DEAD)
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
read_unlock_bh(&call->state_lock);
goto error;
}
@@ -1210,7 +1210,7 @@ maybe_reschedule:
if (call->events || !skb_queue_empty(&call->rx_queue)) {
read_lock_bh(&call->state_lock);
if (call->state < RXRPC_CALL_DEAD)
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
read_unlock_bh(&call->state_lock);
}
@@ -1224,7 +1224,7 @@ maybe_reschedule:
read_lock_bh(&call->state_lock);
if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
!test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
read_unlock_bh(&call->state_lock);
}
@@ -1238,7 +1238,7 @@ error:
* work pending bit and the work item being processed again */
if (call->events && !work_pending(&call->processor)) {
_debug("jumpstart %x", ntohl(call->conn->cid));
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
}
_leave("");
diff --git a/net/rxrpc/ar-call.c b/net/rxrpc/ar-call.c
index ac31cceda2f1..4d92d88ff1fc 100644
--- a/net/rxrpc/ar-call.c
+++ b/net/rxrpc/ar-call.c
@@ -19,7 +19,7 @@ struct kmem_cache *rxrpc_call_jar;
LIST_HEAD(rxrpc_calls);
DEFINE_RWLOCK(rxrpc_call_lock);
static unsigned rxrpc_call_max_lifetime = 60;
-static unsigned rxrpc_dead_call_timeout = 10;
+static unsigned rxrpc_dead_call_timeout = 2;
static void rxrpc_destroy_call(struct work_struct *work);
static void rxrpc_call_life_expired(unsigned long _call);
@@ -264,7 +264,7 @@ struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx,
switch (call->state) {
case RXRPC_CALL_LOCALLY_ABORTED:
if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
case RXRPC_CALL_REMOTELY_ABORTED:
read_unlock(&call->state_lock);
goto aborted_call;
@@ -398,6 +398,7 @@ found_extant_call:
*/
void rxrpc_release_call(struct rxrpc_call *call)
{
+ struct rxrpc_connection *conn = call->conn;
struct rxrpc_sock *rx = call->socket;
_enter("{%d,%d,%d,%d}",
@@ -413,8 +414,7 @@ void rxrpc_release_call(struct rxrpc_call *call)
/* dissociate from the socket
* - the socket's ref on the call is passed to the death timer
*/
- _debug("RELEASE CALL %p (%d CONN %p)",
- call, call->debug_id, call->conn);
+ _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
write_lock_bh(&rx->call_lock);
if (!list_empty(&call->accept_link)) {
@@ -430,24 +430,42 @@ void rxrpc_release_call(struct rxrpc_call *call)
}
write_unlock_bh(&rx->call_lock);
- if (call->conn->out_clientflag)
- spin_lock(&call->conn->trans->client_lock);
- write_lock_bh(&call->conn->lock);
-
/* free up the channel for reuse */
- if (call->conn->out_clientflag) {
- call->conn->avail_calls++;
- if (call->conn->avail_calls == RXRPC_MAXCALLS)
- list_move_tail(&call->conn->bundle_link,
- &call->conn->bundle->unused_conns);
- else if (call->conn->avail_calls == 1)
- list_move_tail(&call->conn->bundle_link,
- &call->conn->bundle->avail_conns);
+ spin_lock(&conn->trans->client_lock);
+ write_lock_bh(&conn->lock);
+ write_lock(&call->state_lock);
+
+ if (conn->channels[call->channel] == call)
+ conn->channels[call->channel] = NULL;
+
+ if (conn->out_clientflag && conn->bundle) {
+ conn->avail_calls++;
+ switch (conn->avail_calls) {
+ case 1:
+ list_move_tail(&conn->bundle_link,
+ &conn->bundle->avail_conns);
+ case 2 ... RXRPC_MAXCALLS - 1:
+ ASSERT(conn->channels[0] == NULL ||
+ conn->channels[1] == NULL ||
+ conn->channels[2] == NULL ||
+ conn->channels[3] == NULL);
+ break;
+ case RXRPC_MAXCALLS:
+ list_move_tail(&conn->bundle_link,
+ &conn->bundle->unused_conns);
+ ASSERT(conn->channels[0] == NULL &&
+ conn->channels[1] == NULL &&
+ conn->channels[2] == NULL &&
+ conn->channels[3] == NULL);
+ break;
+ default:
+ printk(KERN_ERR "RxRPC: conn->avail_calls=%d\n",
+ conn->avail_calls);
+ BUG();
+ }
}
- write_lock(&call->state_lock);
- if (call->conn->channels[call->channel] == call)
- call->conn->channels[call->channel] = NULL;
+ spin_unlock(&conn->trans->client_lock);
if (call->state < RXRPC_CALL_COMPLETE &&
call->state != RXRPC_CALL_CLIENT_FINAL_ACK) {
@@ -455,13 +473,12 @@ void rxrpc_release_call(struct rxrpc_call *call)
call->state = RXRPC_CALL_LOCALLY_ABORTED;
call->abort_code = RX_CALL_DEAD;
set_bit(RXRPC_CALL_ABORT, &call->events);
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
}
write_unlock(&call->state_lock);
- write_unlock_bh(&call->conn->lock);
- if (call->conn->out_clientflag)
- spin_unlock(&call->conn->trans->client_lock);
+ write_unlock_bh(&conn->lock);
+ /* clean up the Rx queue */
if (!skb_queue_empty(&call->rx_queue) ||
!skb_queue_empty(&call->rx_oos_queue)) {
struct rxrpc_skb_priv *sp;
@@ -538,7 +555,7 @@ static void rxrpc_mark_call_released(struct rxrpc_call *call)
if (!test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
sched = true;
if (sched)
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
}
write_unlock(&call->state_lock);
}
@@ -588,7 +605,7 @@ void __rxrpc_put_call(struct rxrpc_call *call)
if (atomic_dec_and_test(&call->usage)) {
_debug("call %d dead", call->debug_id);
ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
- schedule_work(&call->destroyer);
+ rxrpc_queue_work(&call->destroyer);
}
_leave("");
}
@@ -613,7 +630,7 @@ static void rxrpc_cleanup_call(struct rxrpc_call *call)
ASSERTCMP(call->events, ==, 0);
if (work_pending(&call->processor)) {
_debug("defer destroy");
- schedule_work(&call->destroyer);
+ rxrpc_queue_work(&call->destroyer);
return;
}
@@ -742,7 +759,7 @@ static void rxrpc_call_life_expired(unsigned long _call)
read_lock_bh(&call->state_lock);
if (call->state < RXRPC_CALL_COMPLETE) {
set_bit(RXRPC_CALL_LIFE_TIMER, &call->events);
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
}
read_unlock_bh(&call->state_lock);
}
@@ -763,7 +780,7 @@ static void rxrpc_resend_time_expired(unsigned long _call)
clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
if (call->state < RXRPC_CALL_COMPLETE &&
!test_and_set_bit(RXRPC_CALL_RESEND_TIMER, &call->events))
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
read_unlock_bh(&call->state_lock);
}
@@ -782,6 +799,6 @@ static void rxrpc_ack_time_expired(unsigned long _call)
read_lock_bh(&call->state_lock);
if (call->state < RXRPC_CALL_COMPLETE &&
!test_and_set_bit(RXRPC_CALL_ACK, &call->events))
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
read_unlock_bh(&call->state_lock);
}
diff --git a/net/rxrpc/ar-connection.c b/net/rxrpc/ar-connection.c
index 01eb33c30571..43cb3e051ece 100644
--- a/net/rxrpc/ar-connection.c
+++ b/net/rxrpc/ar-connection.c
@@ -356,7 +356,7 @@ static int rxrpc_connect_exclusive(struct rxrpc_sock *rx,
conn->out_clientflag = RXRPC_CLIENT_INITIATED;
conn->cid = 0;
conn->state = RXRPC_CONN_CLIENT;
- conn->avail_calls = RXRPC_MAXCALLS;
+ conn->avail_calls = RXRPC_MAXCALLS - 1;
conn->security_level = rx->min_sec_level;
conn->key = key_get(rx->key);
@@ -447,6 +447,11 @@ int rxrpc_connect_call(struct rxrpc_sock *rx,
if (--conn->avail_calls == 0)
list_move(&conn->bundle_link,
&bundle->busy_conns);
+ ASSERTCMP(conn->avail_calls, <, RXRPC_MAXCALLS);
+ ASSERT(conn->channels[0] == NULL ||
+ conn->channels[1] == NULL ||
+ conn->channels[2] == NULL ||
+ conn->channels[3] == NULL);
atomic_inc(&conn->usage);
break;
}
@@ -456,6 +461,12 @@ int rxrpc_connect_call(struct rxrpc_sock *rx,
conn = list_entry(bundle->unused_conns.next,
struct rxrpc_connection,
bundle_link);
+ ASSERTCMP(conn->avail_calls, ==, RXRPC_MAXCALLS);
+ conn->avail_calls = RXRPC_MAXCALLS - 1;
+ ASSERT(conn->channels[0] == NULL &&
+ conn->channels[1] == NULL &&
+ conn->channels[2] == NULL &&
+ conn->channels[3] == NULL);
atomic_inc(&conn->usage);
list_move(&conn->bundle_link, &bundle->avail_conns);
break;
@@ -512,7 +523,7 @@ int rxrpc_connect_call(struct rxrpc_sock *rx,
candidate->state = RXRPC_CONN_CLIENT;
candidate->avail_calls = RXRPC_MAXCALLS;
candidate->security_level = rx->min_sec_level;
- candidate->key = key_get(rx->key);
+ candidate->key = key_get(bundle->key);
ret = rxrpc_init_client_conn_security(candidate);
if (ret < 0) {
@@ -555,6 +566,10 @@ int rxrpc_connect_call(struct rxrpc_sock *rx,
for (chan = 0; chan < RXRPC_MAXCALLS; chan++)
if (!conn->channels[chan])
goto found_channel;
+ ASSERT(conn->channels[0] == NULL ||
+ conn->channels[1] == NULL ||
+ conn->channels[2] == NULL ||
+ conn->channels[3] == NULL);
BUG();
found_channel:
@@ -567,6 +582,7 @@ found_channel:
_net("CONNECT client on conn %d chan %d as call %x",
conn->debug_id, chan, ntohl(call->call_id));
+ ASSERTCMP(conn->avail_calls, <, RXRPC_MAXCALLS);
spin_unlock(&trans->client_lock);
rxrpc_add_call_ID_to_conn(conn, call);
@@ -778,7 +794,7 @@ void rxrpc_put_connection(struct rxrpc_connection *conn)
conn->put_time = xtime.tv_sec;
if (atomic_dec_and_test(&conn->usage)) {
_debug("zombie");
- schedule_delayed_work(&rxrpc_connection_reap, 0);
+ rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0);
}
_leave("");
@@ -862,8 +878,8 @@ void rxrpc_connection_reaper(struct work_struct *work)
if (earliest != ULONG_MAX) {
_debug("reschedule reaper %ld", (long) earliest - now);
ASSERTCMP(earliest, >, now);
- schedule_delayed_work(&rxrpc_connection_reap,
- (earliest - now) * HZ);
+ rxrpc_queue_delayed_work(&rxrpc_connection_reap,
+ (earliest - now) * HZ);
}
/* then destroy all those pulled out */
@@ -889,7 +905,7 @@ void __exit rxrpc_destroy_all_connections(void)
rxrpc_connection_timeout = 0;
cancel_delayed_work(&rxrpc_connection_reap);
- schedule_delayed_work(&rxrpc_connection_reap, 0);
+ rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0);
_leave("");
}
diff --git a/net/rxrpc/ar-connevent.c b/net/rxrpc/ar-connevent.c
index 4b02815c1ded..1ada43d51165 100644
--- a/net/rxrpc/ar-connevent.c
+++ b/net/rxrpc/ar-connevent.c
@@ -45,7 +45,7 @@ static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state,
set_bit(RXRPC_CALL_CONN_ABORT, &call->events);
else
set_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
}
write_unlock(&call->state_lock);
}
@@ -133,7 +133,7 @@ void rxrpc_call_is_secure(struct rxrpc_call *call)
read_lock(&call->state_lock);
if (call->state < RXRPC_CALL_COMPLETE &&
!test_and_set_bit(RXRPC_CALL_SECURED, &call->events))
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
read_unlock(&call->state_lock);
}
}
@@ -308,6 +308,22 @@ protocol_error:
}
/*
+ * put a packet up for transport-level abort
+ */
+void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
+{
+ CHECK_SLAB_OKAY(&local->usage);
+
+ if (!atomic_inc_not_zero(&local->usage)) {
+ printk("resurrected on reject\n");
+ BUG();
+ }
+
+ skb_queue_tail(&local->reject_queue, skb);
+ rxrpc_queue_work(&local->rejecter);
+}
+
+/*
* reject packets through the local endpoint
*/
void rxrpc_reject_packets(struct work_struct *work)
diff --git a/net/rxrpc/ar-error.c b/net/rxrpc/ar-error.c
index f5539e2f7b58..2c27df1ffa17 100644
--- a/net/rxrpc/ar-error.c
+++ b/net/rxrpc/ar-error.c
@@ -111,7 +111,7 @@ void rxrpc_UDP_error_report(struct sock *sk)
/* pass the transport ref to error_handler to release */
skb_queue_tail(&trans->error_queue, skb);
- schedule_work(&trans->error_handler);
+ rxrpc_queue_work(&trans->error_handler);
/* reset and regenerate socket error */
spin_lock_bh(&sk->sk_error_queue.lock);
@@ -235,7 +235,7 @@ void rxrpc_UDP_error_handler(struct work_struct *work)
call->state < RXRPC_CALL_NETWORK_ERROR) {
call->state = RXRPC_CALL_NETWORK_ERROR;
set_bit(RXRPC_CALL_RCVD_ERROR, &call->events);
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
}
write_unlock(&call->state_lock);
list_del_init(&call->error_link);
@@ -245,7 +245,7 @@ void rxrpc_UDP_error_handler(struct work_struct *work)
}
if (!skb_queue_empty(&trans->error_queue))
- schedule_work(&trans->error_handler);
+ rxrpc_queue_work(&trans->error_handler);
rxrpc_free_skb(skb);
rxrpc_put_transport(trans);
diff --git a/net/rxrpc/ar-input.c b/net/rxrpc/ar-input.c
index 323c3454561c..ceb5d619a1d4 100644
--- a/net/rxrpc/ar-input.c
+++ b/net/rxrpc/ar-input.c
@@ -42,6 +42,7 @@ int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb,
bool force, bool terminal)
{
struct rxrpc_skb_priv *sp;
+ struct rxrpc_sock *rx = call->socket;
struct sock *sk;
int skb_len, ret;
@@ -64,7 +65,7 @@ int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb,
return 0;
}
- sk = &call->socket->sk;
+ sk = &rx->sk;
if (!force) {
/* cast skb->rcvbuf to unsigned... It's pointless, but
@@ -89,25 +90,30 @@ int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb,
skb->sk = sk;
atomic_add(skb->truesize, &sk->sk_rmem_alloc);
- /* 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;
-
- _net("post skb %p", skb);
- __skb_queue_tail(&sk->sk_receive_queue, skb);
- spin_unlock_bh(&sk->sk_receive_queue.lock);
-
- if (!sock_flag(sk, SOCK_DEAD))
- sk->sk_data_ready(sk, skb_len);
-
if (terminal) {
_debug("<<<< TERMINAL MESSAGE >>>>");
set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags);
}
+ /* allow interception by a kernel service */
+ if (rx->interceptor) {
+ rx->interceptor(sk, call->user_call_ID, skb);
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+ } else {
+
+ /* 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;
+
+ _net("post skb %p", skb);
+ __skb_queue_tail(&sk->sk_receive_queue, skb);
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+
+ if (!sock_flag(sk, SOCK_DEAD))
+ sk->sk_data_ready(sk, skb_len);
+ }
skb = NULL;
} else {
spin_unlock_bh(&sk->sk_receive_queue.lock);
@@ -232,7 +238,7 @@ static int rxrpc_fast_process_data(struct rxrpc_call *call,
read_lock(&call->state_lock);
if (call->state < RXRPC_CALL_COMPLETE &&
!test_and_set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events))
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
read_unlock(&call->state_lock);
}
@@ -267,7 +273,7 @@ enqueue_packet:
atomic_inc(&call->ackr_not_idle);
read_lock(&call->state_lock);
if (call->state < RXRPC_CALL_DEAD)
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
read_unlock(&call->state_lock);
_leave(" = 0 [queued]");
return 0;
@@ -360,7 +366,7 @@ void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb)
call->state = RXRPC_CALL_REMOTELY_ABORTED;
call->abort_code = abort_code;
set_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
}
goto free_packet_unlock;
@@ -375,7 +381,7 @@ void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb)
case RXRPC_CALL_CLIENT_SEND_REQUEST:
call->state = RXRPC_CALL_SERVER_BUSY;
set_bit(RXRPC_CALL_RCVD_BUSY, &call->events);
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
case RXRPC_CALL_SERVER_BUSY:
goto free_packet_unlock;
default:
@@ -419,7 +425,7 @@ void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb)
read_lock_bh(&call->state_lock);
if (call->state < RXRPC_CALL_DEAD) {
skb_queue_tail(&call->rx_queue, skb);
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
skb = NULL;
}
read_unlock_bh(&call->state_lock);
@@ -434,7 +440,7 @@ protocol_error_locked:
call->state = RXRPC_CALL_LOCALLY_ABORTED;
call->abort_code = RX_PROTOCOL_ERROR;
set_bit(RXRPC_CALL_ABORT, &call->events);
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
}
free_packet_unlock:
write_unlock_bh(&call->state_lock);
@@ -506,7 +512,7 @@ protocol_error:
call->state = RXRPC_CALL_LOCALLY_ABORTED;
call->abort_code = RX_PROTOCOL_ERROR;
set_bit(RXRPC_CALL_ABORT, &call->events);
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
}
write_unlock_bh(&call->state_lock);
_leave("");
@@ -542,7 +548,7 @@ static void rxrpc_post_packet_to_call(struct rxrpc_connection *conn,
switch (call->state) {
case RXRPC_CALL_LOCALLY_ABORTED:
if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
case RXRPC_CALL_REMOTELY_ABORTED:
case RXRPC_CALL_NETWORK_ERROR:
case RXRPC_CALL_DEAD:
@@ -591,7 +597,7 @@ dead_call:
sp->hdr.seq == __constant_cpu_to_be32(1)) {
_debug("incoming call");
skb_queue_tail(&conn->trans->local->accept_queue, skb);
- schedule_work(&conn->trans->local->acceptor);
+ rxrpc_queue_work(&conn->trans->local->acceptor);
goto done;
}
@@ -630,7 +636,7 @@ found_completed_call:
_debug("final ack again");
rxrpc_get_call(call);
set_bit(RXRPC_CALL_ACK_FINAL, &call->events);
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
free_unlock:
read_unlock(&call->state_lock);
@@ -651,7 +657,7 @@ static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
atomic_inc(&conn->usage);
skb_queue_tail(&conn->rx_queue, skb);
- schedule_work(&conn->processor);
+ rxrpc_queue_conn(conn);
}
/*
@@ -767,7 +773,7 @@ cant_route_call:
if (sp->hdr.seq == __constant_cpu_to_be32(1)) {
_debug("first packet");
skb_queue_tail(&local->accept_queue, skb);
- schedule_work(&local->acceptor);
+ rxrpc_queue_work(&local->acceptor);
rxrpc_put_local(local);
_leave(" [incoming]");
return;
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 7bfbf471c81e..cb1eb492ee48 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -19,8 +19,6 @@
#define CHECK_SLAB_OKAY(X) do {} while(0)
#endif
-extern atomic_t rxrpc_n_skbs;
-
#define FCRYPT_BSIZE 8
struct rxrpc_crypt {
union {
@@ -29,8 +27,12 @@ struct rxrpc_crypt {
};
} __attribute__((aligned(8)));
-extern __be32 rxrpc_epoch; /* local epoch for detecting local-end reset */
-extern atomic_t rxrpc_debug_id; /* current debugging ID */
+#define rxrpc_queue_work(WS) queue_work(rxrpc_workqueue, (WS))
+#define rxrpc_queue_delayed_work(WS,D) \
+ queue_delayed_work(rxrpc_workqueue, (WS), (D))
+
+#define rxrpc_queue_call(CALL) rxrpc_queue_work(&(CALL)->processor)
+#define rxrpc_queue_conn(CONN) rxrpc_queue_work(&(CONN)->processor)
/*
* sk_state for RxRPC sockets
@@ -50,6 +52,7 @@ enum {
struct rxrpc_sock {
/* WARNING: sk has to be the first member */
struct sock sk;
+ rxrpc_interceptor_t interceptor; /* kernel service Rx interceptor function */
struct rxrpc_local *local; /* local endpoint */
struct rxrpc_transport *trans; /* transport handler */
struct rxrpc_conn_bundle *bundle; /* virtual connection bundle */
@@ -91,16 +94,6 @@ struct rxrpc_skb_priv {
#define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
-enum {
- RXRPC_SKB_MARK_DATA, /* data message */
- RXRPC_SKB_MARK_FINAL_ACK, /* final ACK received message */
- RXRPC_SKB_MARK_BUSY, /* server busy message */
- RXRPC_SKB_MARK_REMOTE_ABORT, /* remote abort message */
- RXRPC_SKB_MARK_NET_ERROR, /* network error message */
- RXRPC_SKB_MARK_LOCAL_ERROR, /* local error message */
- RXRPC_SKB_MARK_NEW_CALL, /* local error message */
-};
-
enum rxrpc_command {
RXRPC_CMD_SEND_DATA, /* send data message */
RXRPC_CMD_SEND_ABORT, /* request abort generation */
@@ -439,25 +432,20 @@ static inline void rxrpc_abort_call(struct rxrpc_call *call, u32 abort_code)
}
/*
- * put a packet up for transport-level abort
+ * af_rxrpc.c
*/
-static inline
-void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
-{
- CHECK_SLAB_OKAY(&local->usage);
- if (!atomic_inc_not_zero(&local->usage)) {
- printk("resurrected on reject\n");
- BUG();
- }
- skb_queue_tail(&local->reject_queue, skb);
- schedule_work(&local->rejecter);
-}
+extern atomic_t rxrpc_n_skbs;
+extern __be32 rxrpc_epoch;
+extern atomic_t rxrpc_debug_id;
+extern struct workqueue_struct *rxrpc_workqueue;
/*
* ar-accept.c
*/
extern void rxrpc_accept_incoming_calls(struct work_struct *);
-extern int rxrpc_accept_call(struct rxrpc_sock *, unsigned long);
+extern struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *,
+ unsigned long);
+extern int rxrpc_reject_call(struct rxrpc_sock *);
/*
* ar-ack.c
@@ -514,6 +502,7 @@ rxrpc_incoming_connection(struct rxrpc_transport *, struct rxrpc_header *,
* ar-connevent.c
*/
extern void rxrpc_process_connection(struct work_struct *);
+extern void rxrpc_reject_packet(struct rxrpc_local *, struct sk_buff *);
extern void rxrpc_reject_packets(struct work_struct *);
/*
@@ -583,6 +572,7 @@ extern struct file_operations rxrpc_connection_seq_fops;
/*
* ar-recvmsg.c
*/
+extern void rxrpc_remove_user_ID(struct rxrpc_sock *, struct rxrpc_call *);
extern int rxrpc_recvmsg(struct kiocb *, struct socket *, struct msghdr *,
size_t, int);
diff --git a/net/rxrpc/ar-local.c b/net/rxrpc/ar-local.c
index a20a2c0fe105..fe03f71f17da 100644
--- a/net/rxrpc/ar-local.c
+++ b/net/rxrpc/ar-local.c
@@ -228,7 +228,7 @@ void rxrpc_put_local(struct rxrpc_local *local)
write_lock_bh(&rxrpc_local_lock);
if (unlikely(atomic_dec_and_test(&local->usage))) {
_debug("destroy local");
- schedule_work(&local->destroyer);
+ rxrpc_queue_work(&local->destroyer);
}
write_unlock_bh(&rxrpc_local_lock);
_leave("");
diff --git a/net/rxrpc/ar-output.c b/net/rxrpc/ar-output.c
index 67aa9510f09b..5cdde4a48ed1 100644
--- a/net/rxrpc/ar-output.c
+++ b/net/rxrpc/ar-output.c
@@ -113,7 +113,7 @@ static void rxrpc_send_abort(struct rxrpc_call *call, u32 abort_code)
clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
clear_bit(RXRPC_CALL_ACK, &call->events);
clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
}
write_unlock_bh(&call->state_lock);
@@ -194,6 +194,77 @@ int rxrpc_client_sendmsg(struct kiocb *iocb, struct rxrpc_sock *rx,
return ret;
}
+/**
+ * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
+ * @call: The call to send data through
+ * @msg: The data to send
+ * @len: The amount of data to send
+ *
+ * Allow a kernel service to send data on a call. The call must be in an state
+ * appropriate to sending data. No control data should be supplied in @msg,
+ * nor should an address be supplied. MSG_MORE should be flagged if there's
+ * more data to come, otherwise this data will end the transmission phase.
+ */
+int rxrpc_kernel_send_data(struct rxrpc_call *call, struct msghdr *msg,
+ size_t len)
+{
+ int ret;
+
+ _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
+
+ ASSERTCMP(msg->msg_name, ==, NULL);
+ ASSERTCMP(msg->msg_control, ==, NULL);
+
+ lock_sock(&call->socket->sk);
+
+ _debug("CALL %d USR %lx ST %d on CONN %p",
+ call->debug_id, call->user_call_ID, call->state, call->conn);
+
+ if (call->state >= RXRPC_CALL_COMPLETE) {
+ ret = -ESHUTDOWN; /* it's too late for this call */
+ } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
+ call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
+ call->state != RXRPC_CALL_SERVER_SEND_REPLY) {
+ ret = -EPROTO; /* request phase complete for this client call */
+ } else {
+ mm_segment_t oldfs = get_fs();
+ set_fs(KERNEL_DS);
+ ret = rxrpc_send_data(NULL, call->socket, call, msg, len);
+ set_fs(oldfs);
+ }
+
+ release_sock(&call->socket->sk);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_send_data);
+
+/*
+ * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
+ * @call: The call to be aborted
+ * @abort_code: The abort code to stick into the ABORT packet
+ *
+ * Allow a kernel service to abort a call, if it's still in an abortable state.
+ */
+void rxrpc_kernel_abort_call(struct rxrpc_call *call, u32 abort_code)
+{
+ _enter("{%d},%d", call->debug_id, abort_code);
+
+ lock_sock(&call->socket->sk);
+
+ _debug("CALL %d USR %lx ST %d on CONN %p",
+ call->debug_id, call->user_call_ID, call->state, call->conn);
+
+ if (call->state < RXRPC_CALL_COMPLETE)
+ rxrpc_send_abort(call, abort_code);
+
+ release_sock(&call->socket->sk);
+ _leave("");
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_abort_call);
+
/*
* send a message through a server socket
* - caller holds the socket locked
@@ -214,8 +285,13 @@ int rxrpc_server_sendmsg(struct kiocb *iocb, struct rxrpc_sock *rx,
if (ret < 0)
return ret;
- if (cmd == RXRPC_CMD_ACCEPT)
- return rxrpc_accept_call(rx, user_call_ID);
+ if (cmd == RXRPC_CMD_ACCEPT) {
+ call = rxrpc_accept_call(rx, user_call_ID);
+ if (IS_ERR(call))
+ return PTR_ERR(call);
+ rxrpc_put_call(call);
+ return 0;
+ }
call = rxrpc_find_server_call(rx, user_call_ID);
if (!call)
@@ -363,7 +439,7 @@ static inline void rxrpc_instant_resend(struct rxrpc_call *call)
clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
if (call->state < RXRPC_CALL_COMPLETE &&
!test_and_set_bit(RXRPC_CALL_RESEND_TIMER, &call->events))
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
}
read_unlock_bh(&call->state_lock);
}
diff --git a/net/rxrpc/ar-peer.c b/net/rxrpc/ar-peer.c
index 69ac355546ae..d399de4a7fe2 100644
--- a/net/rxrpc/ar-peer.c
+++ b/net/rxrpc/ar-peer.c
@@ -219,7 +219,7 @@ void rxrpc_put_peer(struct rxrpc_peer *peer)
return;
}
- schedule_work(&peer->destroyer);
+ rxrpc_queue_work(&peer->destroyer);
_leave("");
}
diff --git a/net/rxrpc/ar-recvmsg.c b/net/rxrpc/ar-recvmsg.c
index e947d5c15900..f19121d4795b 100644
--- a/net/rxrpc/ar-recvmsg.c
+++ b/net/rxrpc/ar-recvmsg.c
@@ -19,7 +19,7 @@
* removal a call's user ID from the socket tree to make the user ID available
* again and so that it won't be seen again in association with that call
*/
-static void rxrpc_remove_user_ID(struct rxrpc_sock *rx, struct rxrpc_call *call)
+void rxrpc_remove_user_ID(struct rxrpc_sock *rx, struct rxrpc_call *call)
{
_debug("RELEASE CALL %d", call->debug_id);
@@ -33,7 +33,7 @@ static void rxrpc_remove_user_ID(struct rxrpc_sock *rx, struct rxrpc_call *call)
read_lock_bh(&call->state_lock);
if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
!test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
read_unlock_bh(&call->state_lock);
}
@@ -364,3 +364,74 @@ wait_error:
return copied;
}
+
+/**
+ * rxrpc_kernel_data_delivered - Record delivery of data message
+ * @skb: Message holding data
+ *
+ * Record the delivery of a data message. This permits RxRPC to keep its
+ * tracking correct. The socket buffer will be deleted.
+ */
+void rxrpc_kernel_data_delivered(struct sk_buff *skb)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ struct rxrpc_call *call = sp->call;
+
+ ASSERTCMP(ntohl(sp->hdr.seq), >=, call->rx_data_recv);
+ ASSERTCMP(ntohl(sp->hdr.seq), <=, call->rx_data_recv + 1);
+ call->rx_data_recv = ntohl(sp->hdr.seq);
+
+ ASSERTCMP(ntohl(sp->hdr.seq), >, call->rx_data_eaten);
+ rxrpc_free_skb(skb);
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_data_delivered);
+
+/**
+ * rxrpc_kernel_is_data_last - Determine if data message is last one
+ * @skb: Message holding data
+ *
+ * Determine if data message is last one for the parent call.
+ */
+bool rxrpc_kernel_is_data_last(struct sk_buff *skb)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+
+ ASSERTCMP(skb->mark, ==, RXRPC_SKB_MARK_DATA);
+
+ return sp->hdr.flags & RXRPC_LAST_PACKET;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_is_data_last);
+
+/**
+ * rxrpc_kernel_get_abort_code - Get the abort code from an RxRPC abort message
+ * @skb: Message indicating an abort
+ *
+ * Get the abort code from an RxRPC abort message.
+ */
+u32 rxrpc_kernel_get_abort_code(struct sk_buff *skb)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+
+ ASSERTCMP(skb->mark, ==, RXRPC_SKB_MARK_REMOTE_ABORT);
+
+ return sp->call->abort_code;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_get_abort_code);
+
+/**
+ * rxrpc_kernel_get_error - Get the error number from an RxRPC error message
+ * @skb: Message indicating an error
+ *
+ * Get the error number from an RxRPC error message.
+ */
+int rxrpc_kernel_get_error_number(struct sk_buff *skb)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+
+ return sp->error;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_get_error_number);
diff --git a/net/rxrpc/ar-skbuff.c b/net/rxrpc/ar-skbuff.c
index d73f6fc76011..de755e04d29c 100644
--- a/net/rxrpc/ar-skbuff.c
+++ b/net/rxrpc/ar-skbuff.c
@@ -36,7 +36,7 @@ static void rxrpc_request_final_ACK(struct rxrpc_call *call)
rxrpc_get_call(call);
set_bit(RXRPC_CALL_ACK_FINAL, &call->events);
if (try_to_del_timer_sync(&call->ack_timer) >= 0)
- schedule_work(&call->processor);
+ rxrpc_queue_call(call);
break;
case RXRPC_CALL_SERVER_RECV_REQUEST:
@@ -116,3 +116,17 @@ void rxrpc_packet_destructor(struct sk_buff *skb)
sock_rfree(skb);
_leave("");
}
+
+/**
+ * rxrpc_kernel_free_skb - Free an RxRPC socket buffer
+ * @skb: The socket buffer to be freed
+ *
+ * Let RxRPC free its own socket buffer, permitting it to maintain debug
+ * accounting.
+ */
+void rxrpc_kernel_free_skb(struct sk_buff *skb)
+{
+ rxrpc_free_skb(skb);
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_free_skb);
diff --git a/net/rxrpc/ar-transport.c b/net/rxrpc/ar-transport.c
index 9b4e5cb545d2..d43d78f19302 100644
--- a/net/rxrpc/ar-transport.c
+++ b/net/rxrpc/ar-transport.c
@@ -189,7 +189,7 @@ void rxrpc_put_transport(struct rxrpc_transport *trans)
/* let the reaper determine the timeout to avoid a race with
* overextending the timeout if the reaper is running at the
* same time */
- schedule_delayed_work(&rxrpc_transport_reap, 0);
+ rxrpc_queue_delayed_work(&rxrpc_transport_reap, 0);
_leave("");
}
@@ -243,8 +243,8 @@ static void rxrpc_transport_reaper(struct work_struct *work)
if (earliest != ULONG_MAX) {
_debug("reschedule reaper %ld", (long) earliest - now);
ASSERTCMP(earliest, >, now);
- schedule_delayed_work(&rxrpc_transport_reap,
- (earliest - now) * HZ);
+ rxrpc_queue_delayed_work(&rxrpc_transport_reap,
+ (earliest - now) * HZ);
}
/* then destroy all those pulled out */
@@ -270,7 +270,7 @@ void __exit rxrpc_destroy_all_transports(void)
rxrpc_transport_timeout = 0;
cancel_delayed_work(&rxrpc_transport_reap);
- schedule_delayed_work(&rxrpc_transport_reap, 0);
+ rxrpc_queue_delayed_work(&rxrpc_transport_reap, 0);
_leave("");
}
OpenPOWER on IntegriCloud