1 /* AF_RXRPC implementation
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/net.h>
15 #include <linux/slab.h>
16 #include <linux/skbuff.h>
17 #include <linux/poll.h>
18 #include <linux/proc_fs.h>
19 #include <linux/key-type.h>
20 #include <net/net_namespace.h>
22 #include <net/af_rxrpc.h>
23 #include "ar-internal.h"
25 MODULE_DESCRIPTION("RxRPC network protocol");
26 MODULE_AUTHOR("Red Hat, Inc.");
27 MODULE_LICENSE("GPL");
28 MODULE_ALIAS_NETPROTO(PF_RXRPC);
30 unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
31 module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
32 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
34 static int sysctl_rxrpc_max_qlen __read_mostly = 10;
36 static struct proto rxrpc_proto;
37 static const struct proto_ops rxrpc_rpc_ops;
39 /* local epoch for detecting local-end reset */
42 /* current debugging ID */
43 atomic_t rxrpc_debug_id;
45 /* count of skbs currently in use */
46 atomic_t rxrpc_n_skbs;
48 struct workqueue_struct *rxrpc_workqueue;
50 static void rxrpc_sock_destructor(struct sock *);
53 * see if an RxRPC socket is currently writable
55 static inline int rxrpc_writable(struct sock *sk)
57 return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
61 * wait for write bufferage to become available
63 static void rxrpc_write_space(struct sock *sk)
67 if (rxrpc_writable(sk)) {
68 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
70 if (wq_has_sleeper(wq))
71 wake_up_interruptible(&wq->wait);
72 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
78 * validate an RxRPC address
80 static int rxrpc_validate_address(struct rxrpc_sock *rx,
81 struct sockaddr_rxrpc *srx,
84 if (len < sizeof(struct sockaddr_rxrpc))
87 if (srx->srx_family != AF_RXRPC)
90 if (srx->transport_type != SOCK_DGRAM)
91 return -ESOCKTNOSUPPORT;
93 len -= offsetof(struct sockaddr_rxrpc, transport);
94 if (srx->transport_len < sizeof(sa_family_t) ||
95 srx->transport_len > len)
98 if (srx->transport.family != rx->proto)
101 switch (srx->transport.family) {
103 _debug("INET: %x @ %pI4",
104 ntohs(srx->transport.sin.sin_port),
105 &srx->transport.sin.sin_addr);
106 if (srx->transport_len > 8)
107 memset((void *)&srx->transport + 8, 0,
108 srx->transport_len - 8);
113 return -EAFNOSUPPORT;
120 * bind a local address to an RxRPC socket
122 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
124 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr;
125 struct sock *sk = sock->sk;
126 struct rxrpc_local *local;
127 struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
131 _enter("%p,%p,%d", rx, saddr, len);
133 ret = rxrpc_validate_address(rx, srx, len);
139 if (rx->sk.sk_state != RXRPC_UNCONNECTED) {
144 memcpy(&rx->srx, srx, sizeof(rx->srx));
146 /* find a local transport endpoint if we don't have one already */
147 local = rxrpc_lookup_local(&rx->srx);
149 ret = PTR_ERR(local);
154 if (srx->srx_service) {
155 service_id = htons(srx->srx_service);
156 write_lock_bh(&local->services_lock);
157 list_for_each_entry(prx, &local->services, listen_link) {
158 if (prx->service_id == service_id)
162 rx->service_id = service_id;
163 list_add_tail(&rx->listen_link, &local->services);
164 write_unlock_bh(&local->services_lock);
166 rx->sk.sk_state = RXRPC_SERVER_BOUND;
168 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
171 release_sock(&rx->sk);
177 write_unlock_bh(&local->services_lock);
179 release_sock(&rx->sk);
181 _leave(" = %d", ret);
186 * set the number of pending calls permitted on a listening socket
188 static int rxrpc_listen(struct socket *sock, int backlog)
190 struct sock *sk = sock->sk;
191 struct rxrpc_sock *rx = rxrpc_sk(sk);
194 _enter("%p,%d", rx, backlog);
198 switch (rx->sk.sk_state) {
199 case RXRPC_UNCONNECTED:
200 ret = -EADDRNOTAVAIL;
202 case RXRPC_CLIENT_BOUND:
203 case RXRPC_CLIENT_CONNECTED:
207 case RXRPC_SERVER_BOUND:
208 ASSERT(rx->local != NULL);
209 sk->sk_max_ack_backlog = backlog;
210 rx->sk.sk_state = RXRPC_SERVER_LISTENING;
215 release_sock(&rx->sk);
216 _leave(" = %d", ret);
221 * find a transport by address
223 static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock,
224 struct sockaddr *addr,
225 int addr_len, int flags,
228 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
229 struct rxrpc_transport *trans;
230 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
231 struct rxrpc_peer *peer;
233 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
235 ASSERT(rx->local != NULL);
236 ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED);
238 if (rx->srx.transport_type != srx->transport_type)
239 return ERR_PTR(-ESOCKTNOSUPPORT);
240 if (rx->srx.transport.family != srx->transport.family)
241 return ERR_PTR(-EAFNOSUPPORT);
243 /* find a remote transport endpoint from the local one */
244 peer = rxrpc_get_peer(srx, gfp);
246 return ERR_CAST(peer);
248 /* find a transport */
249 trans = rxrpc_get_transport(rx->local, peer, gfp);
250 rxrpc_put_peer(peer);
251 _leave(" = %p", trans);
256 * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
257 * @sock: The socket on which to make the call
258 * @srx: The address of the peer to contact (defaults to socket setting)
259 * @key: The security context to use (defaults to socket setting)
260 * @user_call_ID: The ID to use
262 * Allow a kernel service to begin a call on the nominated socket. This just
263 * sets up all the internal tracking structures and allocates connection and
264 * call IDs as appropriate. The call to be used is returned.
266 * The default socket destination address and security may be overridden by
267 * supplying @srx and @key.
269 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
270 struct sockaddr_rxrpc *srx,
272 unsigned long user_call_ID,
275 struct rxrpc_conn_bundle *bundle;
276 struct rxrpc_transport *trans;
277 struct rxrpc_call *call;
278 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
281 _enter(",,%x,%lx", key_serial(key), user_call_ID);
286 trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx,
287 sizeof(*srx), 0, gfp);
289 call = ERR_CAST(trans);
296 call = ERR_PTR(-ENOTCONN);
299 atomic_inc(&trans->usage);
302 service_id = rx->service_id;
304 service_id = htons(srx->srx_service);
308 if (key && !key->payload.data)
309 key = NULL; /* a no-security key */
311 bundle = rxrpc_get_bundle(rx, trans, key, service_id, gfp);
312 if (IS_ERR(bundle)) {
313 call = ERR_CAST(bundle);
317 call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true,
319 rxrpc_put_bundle(trans, bundle);
321 rxrpc_put_transport(trans);
323 release_sock(&rx->sk);
324 _leave(" = %p", call);
328 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
331 * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
332 * @call: The call to end
334 * Allow a kernel service to end a call it was using. The call must be
335 * complete before this is called (the call should be aborted if necessary).
337 void rxrpc_kernel_end_call(struct rxrpc_call *call)
339 _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
340 rxrpc_remove_user_ID(call->socket, call);
341 rxrpc_put_call(call);
344 EXPORT_SYMBOL(rxrpc_kernel_end_call);
347 * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
348 * @sock: The socket to intercept received messages on
349 * @interceptor: The function to pass the messages to
351 * Allow a kernel service to intercept messages heading for the Rx queue on an
352 * RxRPC socket. They get passed to the specified function instead.
353 * @interceptor should free the socket buffers it is given. @interceptor is
354 * called with the socket receive queue spinlock held and softirqs disabled -
355 * this ensures that the messages will be delivered in the right order.
357 void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
358 rxrpc_interceptor_t interceptor)
360 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
363 rx->interceptor = interceptor;
366 EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
369 * connect an RxRPC socket
370 * - this just targets it at a specific destination; no actual connection
371 * negotiation takes place
373 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
374 int addr_len, int flags)
376 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
377 struct sock *sk = sock->sk;
378 struct rxrpc_transport *trans;
379 struct rxrpc_local *local;
380 struct rxrpc_sock *rx = rxrpc_sk(sk);
383 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
385 ret = rxrpc_validate_address(rx, srx, addr_len);
387 _leave(" = %d [bad addr]", ret);
393 switch (rx->sk.sk_state) {
394 case RXRPC_UNCONNECTED:
395 /* find a local transport endpoint if we don't have one already */
396 ASSERTCMP(rx->local, ==, NULL);
397 rx->srx.srx_family = AF_RXRPC;
398 rx->srx.srx_service = 0;
399 rx->srx.transport_type = srx->transport_type;
400 rx->srx.transport_len = sizeof(sa_family_t);
401 rx->srx.transport.family = srx->transport.family;
402 local = rxrpc_lookup_local(&rx->srx);
404 release_sock(&rx->sk);
405 return PTR_ERR(local);
408 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
409 case RXRPC_CLIENT_BOUND:
411 case RXRPC_CLIENT_CONNECTED:
412 release_sock(&rx->sk);
415 release_sock(&rx->sk);
416 return -EBUSY; /* server sockets can't connect as well */
419 trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
422 release_sock(&rx->sk);
423 _leave(" = %ld", PTR_ERR(trans));
424 return PTR_ERR(trans);
428 rx->service_id = htons(srx->srx_service);
429 rx->sk.sk_state = RXRPC_CLIENT_CONNECTED;
431 release_sock(&rx->sk);
436 * send a message through an RxRPC socket
437 * - in a client this does a number of things:
438 * - finds/sets up a connection for the security specified (if any)
439 * - initiates a call (ID in control data)
440 * - ends the request phase of a call (if MSG_MORE is not set)
441 * - sends a call data packet
442 * - may send an abort (abort code in control data)
444 static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock,
445 struct msghdr *m, size_t len)
447 struct rxrpc_transport *trans;
448 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
451 _enter(",{%d},,%zu", rx->sk.sk_state, len);
453 if (m->msg_flags & MSG_OOB)
457 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
459 _leave(" = %d [bad addr]", ret);
469 trans = rxrpc_name_to_transport(sock, m->msg_name,
470 m->msg_namelen, 0, GFP_KERNEL);
472 ret = PTR_ERR(trans);
479 atomic_inc(&trans->usage);
482 switch (rx->sk.sk_state) {
483 case RXRPC_SERVER_LISTENING:
485 ret = rxrpc_server_sendmsg(iocb, rx, m, len);
488 case RXRPC_SERVER_BOUND:
489 case RXRPC_CLIENT_BOUND:
494 case RXRPC_CLIENT_CONNECTED:
495 ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len);
503 release_sock(&rx->sk);
505 rxrpc_put_transport(trans);
506 _leave(" = %d", ret);
511 * set RxRPC socket options
513 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
514 char __user *optval, unsigned int optlen)
516 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
517 unsigned int min_sec_level;
520 _enter(",%d,%d,,%d", level, optname, optlen);
525 if (level == SOL_RXRPC) {
527 case RXRPC_EXCLUSIVE_CONNECTION:
532 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
534 set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
537 case RXRPC_SECURITY_KEY:
542 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
544 ret = rxrpc_request_key(rx, optval, optlen);
547 case RXRPC_SECURITY_KEYRING:
552 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
554 ret = rxrpc_server_keyring(rx, optval, optlen);
557 case RXRPC_MIN_SECURITY_LEVEL:
559 if (optlen != sizeof(unsigned int))
562 if (rx->sk.sk_state != RXRPC_UNCONNECTED)
564 ret = get_user(min_sec_level,
565 (unsigned int __user *) optval);
569 if (min_sec_level > RXRPC_SECURITY_MAX)
571 rx->min_sec_level = min_sec_level;
582 release_sock(&rx->sk);
587 * permit an RxRPC socket to be polled
589 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
593 struct sock *sk = sock->sk;
595 sock_poll_wait(file, sk_sleep(sk), wait);
598 /* the socket is readable if there are any messages waiting on the Rx
600 if (!skb_queue_empty(&sk->sk_receive_queue))
601 mask |= POLLIN | POLLRDNORM;
603 /* the socket is writable if there is space to add new data to the
604 * socket; there is no guarantee that any particular call in progress
605 * on the socket may have space in the Tx ACK window */
606 if (rxrpc_writable(sk))
607 mask |= POLLOUT | POLLWRNORM;
613 * create an RxRPC socket
615 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
618 struct rxrpc_sock *rx;
621 _enter("%p,%d", sock, protocol);
623 if (!net_eq(net, &init_net))
624 return -EAFNOSUPPORT;
626 /* we support transport protocol UDP only */
627 if (protocol != PF_INET)
628 return -EPROTONOSUPPORT;
630 if (sock->type != SOCK_DGRAM)
631 return -ESOCKTNOSUPPORT;
633 sock->ops = &rxrpc_rpc_ops;
634 sock->state = SS_UNCONNECTED;
636 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto);
640 sock_init_data(sock, sk);
641 sk->sk_state = RXRPC_UNCONNECTED;
642 sk->sk_write_space = rxrpc_write_space;
643 sk->sk_max_ack_backlog = sysctl_rxrpc_max_qlen;
644 sk->sk_destruct = rxrpc_sock_destructor;
647 rx->proto = protocol;
650 INIT_LIST_HEAD(&rx->listen_link);
651 INIT_LIST_HEAD(&rx->secureq);
652 INIT_LIST_HEAD(&rx->acceptq);
653 rwlock_init(&rx->call_lock);
654 memset(&rx->srx, 0, sizeof(rx->srx));
656 _leave(" = 0 [%p]", rx);
661 * RxRPC socket destructor
663 static void rxrpc_sock_destructor(struct sock *sk)
667 rxrpc_purge_queue(&sk->sk_receive_queue);
669 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
670 WARN_ON(!sk_unhashed(sk));
671 WARN_ON(sk->sk_socket);
673 if (!sock_flag(sk, SOCK_DEAD)) {
674 printk("Attempt to release alive rxrpc socket: %p\n", sk);
680 * release an RxRPC socket
682 static int rxrpc_release_sock(struct sock *sk)
684 struct rxrpc_sock *rx = rxrpc_sk(sk);
686 _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
688 /* declare the socket closed for business */
690 sk->sk_shutdown = SHUTDOWN_MASK;
692 spin_lock_bh(&sk->sk_receive_queue.lock);
693 sk->sk_state = RXRPC_CLOSE;
694 spin_unlock_bh(&sk->sk_receive_queue.lock);
696 ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
698 if (!list_empty(&rx->listen_link)) {
699 write_lock_bh(&rx->local->services_lock);
700 list_del(&rx->listen_link);
701 write_unlock_bh(&rx->local->services_lock);
704 /* try to flush out this socket */
705 rxrpc_release_calls_on_socket(rx);
706 flush_workqueue(rxrpc_workqueue);
707 rxrpc_purge_queue(&sk->sk_receive_queue);
710 rxrpc_put_connection(rx->conn);
715 rxrpc_put_bundle(rx->trans, rx->bundle);
719 rxrpc_put_transport(rx->trans);
723 rxrpc_put_local(rx->local);
729 key_put(rx->securities);
730 rx->securities = NULL;
738 * release an RxRPC BSD socket on close() or equivalent
740 static int rxrpc_release(struct socket *sock)
742 struct sock *sk = sock->sk;
744 _enter("%p{%p}", sock, sk);
751 return rxrpc_release_sock(sk);
755 * RxRPC network protocol
757 static const struct proto_ops rxrpc_rpc_ops = {
759 .owner = THIS_MODULE,
760 .release = rxrpc_release,
762 .connect = rxrpc_connect,
763 .socketpair = sock_no_socketpair,
764 .accept = sock_no_accept,
765 .getname = sock_no_getname,
767 .ioctl = sock_no_ioctl,
768 .listen = rxrpc_listen,
769 .shutdown = sock_no_shutdown,
770 .setsockopt = rxrpc_setsockopt,
771 .getsockopt = sock_no_getsockopt,
772 .sendmsg = rxrpc_sendmsg,
773 .recvmsg = rxrpc_recvmsg,
774 .mmap = sock_no_mmap,
775 .sendpage = sock_no_sendpage,
778 static struct proto rxrpc_proto = {
780 .owner = THIS_MODULE,
781 .obj_size = sizeof(struct rxrpc_sock),
782 .max_header = sizeof(struct rxrpc_header),
785 static const struct net_proto_family rxrpc_family_ops = {
787 .create = rxrpc_create,
788 .owner = THIS_MODULE,
792 * initialise and register the RxRPC protocol
794 static int __init af_rxrpc_init(void)
798 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
800 rxrpc_epoch = htonl(get_seconds());
803 rxrpc_call_jar = kmem_cache_create(
804 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
805 SLAB_HWCACHE_ALIGN, NULL);
806 if (!rxrpc_call_jar) {
807 printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
811 rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
812 if (!rxrpc_workqueue) {
813 printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n");
814 goto error_work_queue;
817 ret = proto_register(&rxrpc_proto, 1);
819 printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
823 ret = sock_register(&rxrpc_family_ops);
825 printk(KERN_CRIT "RxRPC: Cannot register socket family\n");
829 ret = register_key_type(&key_type_rxrpc);
831 printk(KERN_CRIT "RxRPC: Cannot register client key type\n");
835 ret = register_key_type(&key_type_rxrpc_s);
837 printk(KERN_CRIT "RxRPC: Cannot register server key type\n");
838 goto error_key_type_s;
841 #ifdef CONFIG_PROC_FS
842 proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
843 proc_create("rxrpc_conns", 0, init_net.proc_net,
844 &rxrpc_connection_seq_fops);
849 unregister_key_type(&key_type_rxrpc);
851 sock_unregister(PF_RXRPC);
853 proto_unregister(&rxrpc_proto);
855 destroy_workqueue(rxrpc_workqueue);
857 kmem_cache_destroy(rxrpc_call_jar);
863 * unregister the RxRPC protocol
865 static void __exit af_rxrpc_exit(void)
868 unregister_key_type(&key_type_rxrpc_s);
869 unregister_key_type(&key_type_rxrpc);
870 sock_unregister(PF_RXRPC);
871 proto_unregister(&rxrpc_proto);
872 rxrpc_destroy_all_calls();
873 rxrpc_destroy_all_connections();
874 rxrpc_destroy_all_transports();
875 rxrpc_destroy_all_peers();
876 rxrpc_destroy_all_locals();
878 ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
880 _debug("flush scheduled work");
881 flush_workqueue(rxrpc_workqueue);
882 remove_proc_entry("rxrpc_conns", init_net.proc_net);
883 remove_proc_entry("rxrpc_calls", init_net.proc_net);
884 destroy_workqueue(rxrpc_workqueue);
885 kmem_cache_destroy(rxrpc_call_jar);
889 module_init(af_rxrpc_init);
890 module_exit(af_rxrpc_exit);