af_rxrpc.c 20.5 KB
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/* AF_RXRPC implementation
 *
 * 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
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/net.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
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#include <linux/key-type.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
#include <net/af_rxrpc.h>
#include "ar-internal.h"

MODULE_DESCRIPTION("RxRPC network protocol");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_RXRPC);

unsigned rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
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MODULE_PARM_DESC(debug, "RxRPC debugging mask");
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static int sysctl_rxrpc_max_qlen __read_mostly = 10;

static struct proto rxrpc_proto;
static const struct proto_ops rxrpc_rpc_ops;

/* local epoch for detecting local-end reset */
__be32 rxrpc_epoch;

/* current debugging ID */
atomic_t rxrpc_debug_id;

/* count of skbs currently in use */
atomic_t rxrpc_n_skbs;

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struct workqueue_struct *rxrpc_workqueue;

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static void rxrpc_sock_destructor(struct sock *);

/*
 * see if an RxRPC socket is currently writable
 */
static inline int rxrpc_writable(struct sock *sk)
{
	return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
}

/*
 * wait for write bufferage to become available
 */
static void rxrpc_write_space(struct sock *sk)
{
	_enter("%p", sk);
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	rcu_read_lock();
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	if (rxrpc_writable(sk)) {
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		struct socket_wq *wq = rcu_dereference(sk->sk_wq);

		if (wq_has_sleeper(wq))
			wake_up_interruptible(&wq->wait);
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		sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
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	}
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	rcu_read_unlock();
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}

/*
 * validate an RxRPC address
 */
static int rxrpc_validate_address(struct rxrpc_sock *rx,
				  struct sockaddr_rxrpc *srx,
				  int len)
{
	if (len < sizeof(struct sockaddr_rxrpc))
		return -EINVAL;

	if (srx->srx_family != AF_RXRPC)
		return -EAFNOSUPPORT;

	if (srx->transport_type != SOCK_DGRAM)
		return -ESOCKTNOSUPPORT;

	len -= offsetof(struct sockaddr_rxrpc, transport);
	if (srx->transport_len < sizeof(sa_family_t) ||
	    srx->transport_len > len)
		return -EINVAL;

	if (srx->transport.family != rx->proto)
		return -EAFNOSUPPORT;

	switch (srx->transport.family) {
	case AF_INET:
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		_debug("INET: %x @ %pI4",
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		       ntohs(srx->transport.sin.sin_port),
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		       &srx->transport.sin.sin_addr);
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		if (srx->transport_len > 8)
			memset((void *)&srx->transport + 8, 0,
			       srx->transport_len - 8);
		break;

	case AF_INET6:
	default:
		return -EAFNOSUPPORT;
	}

	return 0;
}

/*
 * bind a local address to an RxRPC socket
 */
static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
{
	struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr;
	struct sock *sk = sock->sk;
	struct rxrpc_local *local;
	struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
	__be16 service_id;
	int ret;

	_enter("%p,%p,%d", rx, saddr, len);

	ret = rxrpc_validate_address(rx, srx, len);
	if (ret < 0)
		goto error;

	lock_sock(&rx->sk);

	if (rx->sk.sk_state != RXRPC_UNCONNECTED) {
		ret = -EINVAL;
		goto error_unlock;
	}

	memcpy(&rx->srx, srx, sizeof(rx->srx));

	/* find a local transport endpoint if we don't have one already */
	local = rxrpc_lookup_local(&rx->srx);
	if (IS_ERR(local)) {
		ret = PTR_ERR(local);
		goto error_unlock;
	}

	rx->local = local;
	if (srx->srx_service) {
		service_id = htons(srx->srx_service);
		write_lock_bh(&local->services_lock);
		list_for_each_entry(prx, &local->services, listen_link) {
			if (prx->service_id == service_id)
				goto service_in_use;
		}

		rx->service_id = service_id;
		list_add_tail(&rx->listen_link, &local->services);
		write_unlock_bh(&local->services_lock);

		rx->sk.sk_state = RXRPC_SERVER_BOUND;
	} else {
		rx->sk.sk_state = RXRPC_CLIENT_BOUND;
	}

	release_sock(&rx->sk);
	_leave(" = 0");
	return 0;

service_in_use:
	ret = -EADDRINUSE;
	write_unlock_bh(&local->services_lock);
error_unlock:
	release_sock(&rx->sk);
error:
	_leave(" = %d", ret);
	return ret;
}

/*
 * set the number of pending calls permitted on a listening socket
 */
static int rxrpc_listen(struct socket *sock, int backlog)
{
	struct sock *sk = sock->sk;
	struct rxrpc_sock *rx = rxrpc_sk(sk);
	int ret;

	_enter("%p,%d", rx, backlog);

	lock_sock(&rx->sk);

	switch (rx->sk.sk_state) {
	case RXRPC_UNCONNECTED:
		ret = -EADDRNOTAVAIL;
		break;
	case RXRPC_CLIENT_BOUND:
	case RXRPC_CLIENT_CONNECTED:
	default:
		ret = -EBUSY;
		break;
	case RXRPC_SERVER_BOUND:
		ASSERT(rx->local != NULL);
		sk->sk_max_ack_backlog = backlog;
		rx->sk.sk_state = RXRPC_SERVER_LISTENING;
		ret = 0;
		break;
	}

	release_sock(&rx->sk);
	_leave(" = %d", ret);
	return ret;
}

/*
 * find a transport by address
 */
static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock,
						       struct sockaddr *addr,
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						       int addr_len, int flags,
						       gfp_t gfp)
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{
	struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
	struct rxrpc_transport *trans;
	struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
	struct rxrpc_peer *peer;

	_enter("%p,%p,%d,%d", rx, addr, addr_len, flags);

	ASSERT(rx->local != NULL);
	ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED);

	if (rx->srx.transport_type != srx->transport_type)
		return ERR_PTR(-ESOCKTNOSUPPORT);
	if (rx->srx.transport.family != srx->transport.family)
		return ERR_PTR(-EAFNOSUPPORT);

	/* find a remote transport endpoint from the local one */
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	peer = rxrpc_get_peer(srx, gfp);
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	if (IS_ERR(peer))
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		return ERR_CAST(peer);
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	/* find a transport */
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	trans = rxrpc_get_transport(rx->local, peer, gfp);
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	rxrpc_put_peer(peer);
	_leave(" = %p", trans);
	return trans;
}

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/**
 * 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)) {
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			call = ERR_CAST(trans);
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			trans = NULL;
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			goto out_notrans;
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		}
	} else {
		trans = rx->trans;
		if (!trans) {
			call = ERR_PTR(-ENOTCONN);
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			goto out_notrans;
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		}
		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)) {
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		call = ERR_CAST(bundle);
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		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);
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out_notrans:
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	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);

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/*
 * connect an RxRPC socket
 * - this just targets it at a specific destination; no actual connection
 *   negotiation takes place
 */
static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
			 int addr_len, int flags)
{
	struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
	struct sock *sk = sock->sk;
	struct rxrpc_transport *trans;
	struct rxrpc_local *local;
	struct rxrpc_sock *rx = rxrpc_sk(sk);
	int ret;

	_enter("%p,%p,%d,%d", rx, addr, addr_len, flags);

	ret = rxrpc_validate_address(rx, srx, addr_len);
	if (ret < 0) {
		_leave(" = %d [bad addr]", ret);
		return ret;
	}

	lock_sock(&rx->sk);

	switch (rx->sk.sk_state) {
	case RXRPC_UNCONNECTED:
		/* find a local transport endpoint if we don't have one already */
		ASSERTCMP(rx->local, ==, NULL);
		rx->srx.srx_family = AF_RXRPC;
		rx->srx.srx_service = 0;
		rx->srx.transport_type = srx->transport_type;
		rx->srx.transport_len = sizeof(sa_family_t);
		rx->srx.transport.family = srx->transport.family;
		local = rxrpc_lookup_local(&rx->srx);
		if (IS_ERR(local)) {
			release_sock(&rx->sk);
			return PTR_ERR(local);
		}
		rx->local = local;
		rx->sk.sk_state = RXRPC_CLIENT_BOUND;
	case RXRPC_CLIENT_BOUND:
		break;
	case RXRPC_CLIENT_CONNECTED:
		release_sock(&rx->sk);
		return -EISCONN;
	default:
		release_sock(&rx->sk);
		return -EBUSY; /* server sockets can't connect as well */
	}

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	trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
					GFP_KERNEL);
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	if (IS_ERR(trans)) {
		release_sock(&rx->sk);
		_leave(" = %ld", PTR_ERR(trans));
		return PTR_ERR(trans);
	}

	rx->trans = trans;
	rx->service_id = htons(srx->srx_service);
	rx->sk.sk_state = RXRPC_CLIENT_CONNECTED;

	release_sock(&rx->sk);
	return 0;
}

/*
 * send a message through an RxRPC socket
 * - in a client this does a number of things:
 *   - finds/sets up a connection for the security specified (if any)
 *   - initiates a call (ID in control data)
 *   - ends the request phase of a call (if MSG_MORE is not set)
 *   - sends a call data packet
 *   - may send an abort (abort code in control data)
 */
static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock,
			 struct msghdr *m, size_t len)
{
	struct rxrpc_transport *trans;
	struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
	int ret;

	_enter(",{%d},,%zu", rx->sk.sk_state, len);

	if (m->msg_flags & MSG_OOB)
		return -EOPNOTSUPP;

	if (m->msg_name) {
		ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
		if (ret < 0) {
			_leave(" = %d [bad addr]", ret);
			return ret;
		}
	}

	trans = NULL;
	lock_sock(&rx->sk);

	if (m->msg_name) {
		ret = -EISCONN;
		trans = rxrpc_name_to_transport(sock, m->msg_name,
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						m->msg_namelen, 0, GFP_KERNEL);
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		if (IS_ERR(trans)) {
			ret = PTR_ERR(trans);
			trans = NULL;
			goto out;
		}
	} else {
		trans = rx->trans;
		if (trans)
			atomic_inc(&trans->usage);
	}

	switch (rx->sk.sk_state) {
	case RXRPC_SERVER_LISTENING:
		if (!m->msg_name) {
			ret = rxrpc_server_sendmsg(iocb, rx, m, len);
			break;
		}
	case RXRPC_SERVER_BOUND:
	case RXRPC_CLIENT_BOUND:
		if (!m->msg_name) {
			ret = -ENOTCONN;
			break;
		}
	case RXRPC_CLIENT_CONNECTED:
		ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len);
		break;
	default:
		ret = -ENOTCONN;
		break;
	}

out:
	release_sock(&rx->sk);
	if (trans)
		rxrpc_put_transport(trans);
	_leave(" = %d", ret);
	return ret;
}

/*
 * set RxRPC socket options
 */
static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
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			    char __user *optval, unsigned int optlen)
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{
	struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
	unsigned min_sec_level;
	int ret;

	_enter(",%d,%d,,%d", level, optname, optlen);

	lock_sock(&rx->sk);
	ret = -EOPNOTSUPP;

	if (level == SOL_RXRPC) {
		switch (optname) {
		case RXRPC_EXCLUSIVE_CONNECTION:
			ret = -EINVAL;
			if (optlen != 0)
				goto error;
			ret = -EISCONN;
			if (rx->sk.sk_state != RXRPC_UNCONNECTED)
				goto error;
			set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
			goto success;

		case RXRPC_SECURITY_KEY:
			ret = -EINVAL;
			if (rx->key)
				goto error;
			ret = -EISCONN;
			if (rx->sk.sk_state != RXRPC_UNCONNECTED)
				goto error;
			ret = rxrpc_request_key(rx, optval, optlen);
			goto error;

		case RXRPC_SECURITY_KEYRING:
			ret = -EINVAL;
			if (rx->key)
				goto error;
			ret = -EISCONN;
			if (rx->sk.sk_state != RXRPC_UNCONNECTED)
				goto error;
			ret = rxrpc_server_keyring(rx, optval, optlen);
			goto error;

		case RXRPC_MIN_SECURITY_LEVEL:
			ret = -EINVAL;
			if (optlen != sizeof(unsigned))
				goto error;
			ret = -EISCONN;
			if (rx->sk.sk_state != RXRPC_UNCONNECTED)
				goto error;
			ret = get_user(min_sec_level,
				       (unsigned __user *) optval);
			if (ret < 0)
				goto error;
			ret = -EINVAL;
			if (min_sec_level > RXRPC_SECURITY_MAX)
				goto error;
			rx->min_sec_level = min_sec_level;
			goto success;

		default:
			break;
		}
	}

success:
	ret = 0;
error:
	release_sock(&rx->sk);
	return ret;
}

/*
 * permit an RxRPC socket to be polled
 */
static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
			       poll_table *wait)
{
	unsigned int mask;
	struct sock *sk = sock->sk;

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	sock_poll_wait(file, sk_sleep(sk), wait);
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	mask = 0;

	/* the socket is readable if there are any messages waiting on the Rx
	 * queue */
	if (!skb_queue_empty(&sk->sk_receive_queue))
		mask |= POLLIN | POLLRDNORM;

	/* the socket is writable if there is space to add new data to the
	 * socket; there is no guarantee that any particular call in progress
	 * on the socket may have space in the Tx ACK window */
	if (rxrpc_writable(sk))
		mask |= POLLOUT | POLLWRNORM;

	return mask;
}

/*
 * create an RxRPC socket
 */
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static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
			int kern)
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{
	struct rxrpc_sock *rx;
	struct sock *sk;

	_enter("%p,%d", sock, protocol);

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	if (!net_eq(net, &init_net))
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		return -EAFNOSUPPORT;

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	/* we support transport protocol UDP only */
	if (protocol != PF_INET)
		return -EPROTONOSUPPORT;

	if (sock->type != SOCK_DGRAM)
		return -ESOCKTNOSUPPORT;

	sock->ops = &rxrpc_rpc_ops;
	sock->state = SS_UNCONNECTED;

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	sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto);
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	if (!sk)
		return -ENOMEM;

	sock_init_data(sock, sk);
	sk->sk_state		= RXRPC_UNCONNECTED;
	sk->sk_write_space	= rxrpc_write_space;
	sk->sk_max_ack_backlog	= sysctl_rxrpc_max_qlen;
	sk->sk_destruct		= rxrpc_sock_destructor;

	rx = rxrpc_sk(sk);
	rx->proto = protocol;
	rx->calls = RB_ROOT;

	INIT_LIST_HEAD(&rx->listen_link);
	INIT_LIST_HEAD(&rx->secureq);
	INIT_LIST_HEAD(&rx->acceptq);
	rwlock_init(&rx->call_lock);
	memset(&rx->srx, 0, sizeof(rx->srx));

	_leave(" = 0 [%p]", rx);
	return 0;
}

/*
 * RxRPC socket destructor
 */
static void rxrpc_sock_destructor(struct sock *sk)
{
	_enter("%p", sk);

	rxrpc_purge_queue(&sk->sk_receive_queue);

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	WARN_ON(atomic_read(&sk->sk_wmem_alloc));
	WARN_ON(!sk_unhashed(sk));
	WARN_ON(sk->sk_socket);
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	if (!sock_flag(sk, SOCK_DEAD)) {
		printk("Attempt to release alive rxrpc socket: %p\n", sk);
		return;
	}
}

/*
 * release an RxRPC socket
 */
static int rxrpc_release_sock(struct sock *sk)
{
	struct rxrpc_sock *rx = rxrpc_sk(sk);

	_enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));

	/* declare the socket closed for business */
	sock_orphan(sk);
	sk->sk_shutdown = SHUTDOWN_MASK;

	spin_lock_bh(&sk->sk_receive_queue.lock);
	sk->sk_state = RXRPC_CLOSE;
	spin_unlock_bh(&sk->sk_receive_queue.lock);

	ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);

	if (!list_empty(&rx->listen_link)) {
		write_lock_bh(&rx->local->services_lock);
		list_del(&rx->listen_link);
		write_unlock_bh(&rx->local->services_lock);
	}

	/* try to flush out this socket */
	rxrpc_release_calls_on_socket(rx);
705
	flush_workqueue(rxrpc_workqueue);
706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783
	rxrpc_purge_queue(&sk->sk_receive_queue);

	if (rx->conn) {
		rxrpc_put_connection(rx->conn);
		rx->conn = NULL;
	}

	if (rx->bundle) {
		rxrpc_put_bundle(rx->trans, rx->bundle);
		rx->bundle = NULL;
	}
	if (rx->trans) {
		rxrpc_put_transport(rx->trans);
		rx->trans = NULL;
	}
	if (rx->local) {
		rxrpc_put_local(rx->local);
		rx->local = NULL;
	}

	key_put(rx->key);
	rx->key = NULL;
	key_put(rx->securities);
	rx->securities = NULL;
	sock_put(sk);

	_leave(" = 0");
	return 0;
}

/*
 * release an RxRPC BSD socket on close() or equivalent
 */
static int rxrpc_release(struct socket *sock)
{
	struct sock *sk = sock->sk;

	_enter("%p{%p}", sock, sk);

	if (!sk)
		return 0;

	sock->sk = NULL;

	return rxrpc_release_sock(sk);
}

/*
 * RxRPC network protocol
 */
static const struct proto_ops rxrpc_rpc_ops = {
	.family		= PF_UNIX,
	.owner		= THIS_MODULE,
	.release	= rxrpc_release,
	.bind		= rxrpc_bind,
	.connect	= rxrpc_connect,
	.socketpair	= sock_no_socketpair,
	.accept		= sock_no_accept,
	.getname	= sock_no_getname,
	.poll		= rxrpc_poll,
	.ioctl		= sock_no_ioctl,
	.listen		= rxrpc_listen,
	.shutdown	= sock_no_shutdown,
	.setsockopt	= rxrpc_setsockopt,
	.getsockopt	= sock_no_getsockopt,
	.sendmsg	= rxrpc_sendmsg,
	.recvmsg	= rxrpc_recvmsg,
	.mmap		= sock_no_mmap,
	.sendpage	= sock_no_sendpage,
};

static struct proto rxrpc_proto = {
	.name		= "RXRPC",
	.owner		= THIS_MODULE,
	.obj_size	= sizeof(struct rxrpc_sock),
	.max_header	= sizeof(struct rxrpc_header),
};

784
static const struct net_proto_family rxrpc_family_ops = {
785 786 787 788 789 790 791 792 793 794 795 796 797 798 799
	.family	= PF_RXRPC,
	.create = rxrpc_create,
	.owner	= THIS_MODULE,
};

/*
 * initialise and register the RxRPC protocol
 */
static int __init af_rxrpc_init(void)
{
	struct sk_buff *dummy_skb;
	int ret = -1;

	BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof(dummy_skb->cb));

800
	rxrpc_epoch = htonl(get_seconds());
801

802
	ret = -ENOMEM;
803 804
	rxrpc_call_jar = kmem_cache_create(
		"rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
805
		SLAB_HWCACHE_ALIGN, NULL);
806 807 808 809 810
	if (!rxrpc_call_jar) {
		printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
		goto error_call_jar;
	}

811 812 813 814 815 816
	rxrpc_workqueue = create_workqueue("krxrpcd");
	if (!rxrpc_workqueue) {
		printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n");
		goto error_work_queue;
	}

817
	ret = proto_register(&rxrpc_proto, 1);
818 819
	if (ret < 0) {
		printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
820 821 822 823 824
		goto error_proto;
	}

	ret = sock_register(&rxrpc_family_ops);
	if (ret < 0) {
825
		printk(KERN_CRIT "RxRPC: Cannot register socket family\n");
826 827 828 829 830
		goto error_sock;
	}

	ret = register_key_type(&key_type_rxrpc);
	if (ret < 0) {
831
		printk(KERN_CRIT "RxRPC: Cannot register client key type\n");
832 833 834 835 836
		goto error_key_type;
	}

	ret = register_key_type(&key_type_rxrpc_s);
	if (ret < 0) {
837
		printk(KERN_CRIT "RxRPC: Cannot register server key type\n");
838 839 840 841
		goto error_key_type_s;
	}

#ifdef CONFIG_PROC_FS
842 843
	proc_net_fops_create(&init_net, "rxrpc_calls", 0, &rxrpc_call_seq_fops);
	proc_net_fops_create(&init_net, "rxrpc_conns", 0, &rxrpc_connection_seq_fops);
844 845 846 847 848 849 850 851 852 853
#endif
	return 0;

error_key_type_s:
	unregister_key_type(&key_type_rxrpc);
error_key_type:
	sock_unregister(PF_RXRPC);
error_sock:
	proto_unregister(&rxrpc_proto);
error_proto:
854 855
	destroy_workqueue(rxrpc_workqueue);
error_work_queue:
856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879
	kmem_cache_destroy(rxrpc_call_jar);
error_call_jar:
	return ret;
}

/*
 * unregister the RxRPC protocol
 */
static void __exit af_rxrpc_exit(void)
{
	_enter("");
	unregister_key_type(&key_type_rxrpc_s);
	unregister_key_type(&key_type_rxrpc);
	sock_unregister(PF_RXRPC);
	proto_unregister(&rxrpc_proto);
	rxrpc_destroy_all_calls();
	rxrpc_destroy_all_connections();
	rxrpc_destroy_all_transports();
	rxrpc_destroy_all_peers();
	rxrpc_destroy_all_locals();

	ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);

	_debug("flush scheduled work");
880
	flush_workqueue(rxrpc_workqueue);
881 882
	proc_net_remove(&init_net, "rxrpc_conns");
	proc_net_remove(&init_net, "rxrpc_calls");
883
	destroy_workqueue(rxrpc_workqueue);
884 885 886 887 888 889
	kmem_cache_destroy(rxrpc_call_jar);
	_leave("");
}

module_init(af_rxrpc_init);
module_exit(af_rxrpc_exit);