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af_rxrpc.c
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/* AF_RXRPC implementation
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells ([email protected])
*
* 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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/net.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/random.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/key-type.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#define CREATE_TRACE_POINTS
#include "ar-internal.h"
MODULE_DESCRIPTION("RxRPC network protocol");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_RXRPC);
unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
module_param_named(debug, rxrpc_debug, uint, 0644);
MODULE_PARM_DESC(debug, "RxRPC debugging mask");
static struct proto rxrpc_proto;
static const struct proto_ops rxrpc_rpc_ops;
/* current debugging ID */
atomic_t rxrpc_debug_id;
EXPORT_SYMBOL(rxrpc_debug_id);
/* count of skbs currently in use */
atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
struct workqueue_struct *rxrpc_workqueue;
static void rxrpc_sock_destructor(struct sock *);
/*
* see if an RxRPC socket is currently writable
*/
static inline int rxrpc_writable(struct sock *sk)
{
return refcount_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);
rcu_read_lock();
if (rxrpc_writable(sk)) {
struct socket_wq *wq = rcu_dereference(sk->sk_wq);
if (skwq_has_sleeper(wq))
wake_up_interruptible(&wq->wait);
sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
}
rcu_read_unlock();
}
/*
* validate an RxRPC address
*/
static int rxrpc_validate_address(struct rxrpc_sock *rx,
struct sockaddr_rxrpc *srx,
int len)
{
unsigned int tail;
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->family &&
srx->transport.family == AF_INET && rx->family != AF_INET6)
return -EAFNOSUPPORT;
switch (srx->transport.family) {
case AF_INET:
if (srx->transport_len < sizeof(struct sockaddr_in))
return -EINVAL;
tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
break;
#ifdef CONFIG_AF_RXRPC_IPV6
case AF_INET6:
if (srx->transport_len < sizeof(struct sockaddr_in6))
return -EINVAL;
tail = offsetof(struct sockaddr_rxrpc, transport) +
sizeof(struct sockaddr_in6);
break;
#endif
default:
return -EAFNOSUPPORT;
}
if (tail < len)
memset((void *)srx + tail, 0, len - tail);
_debug("INET: %pISp", &srx->transport);
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 rxrpc_local *local;
struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
u16 service_id = srx->srx_service;
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);
switch (rx->sk.sk_state) {
case RXRPC_UNBOUND:
rx->srx = *srx;
local = rxrpc_lookup_local(sock_net(&rx->sk), &rx->srx);
if (IS_ERR(local)) {
ret = PTR_ERR(local);
goto error_unlock;
}
if (service_id) {
write_lock(&local->services_lock);
if (rcu_access_pointer(local->service))
goto service_in_use;
rx->local = local;
rcu_assign_pointer(local->service, rx);
write_unlock(&local->services_lock);
rx->sk.sk_state = RXRPC_SERVER_BOUND;
} else {
rx->local = local;
rx->sk.sk_state = RXRPC_CLIENT_BOUND;
}
break;
case RXRPC_SERVER_BOUND:
ret = -EINVAL;
if (service_id == 0)
goto error_unlock;
ret = -EADDRINUSE;
if (service_id == rx->srx.srx_service)
goto error_unlock;
ret = -EINVAL;
srx->srx_service = rx->srx.srx_service;
if (memcmp(srx, &rx->srx, sizeof(*srx)) != 0)
goto error_unlock;
rx->second_service = service_id;
rx->sk.sk_state = RXRPC_SERVER_BOUND2;
break;
default:
ret = -EINVAL;
goto error_unlock;
}
release_sock(&rx->sk);
_leave(" = 0");
return 0;
service_in_use:
write_unlock(&local->services_lock);
rxrpc_put_local(local);
ret = -EADDRINUSE;
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);
unsigned int max, old;
int ret;
_enter("%p,%d", rx, backlog);
lock_sock(&rx->sk);
switch (rx->sk.sk_state) {
case RXRPC_UNBOUND:
ret = -EADDRNOTAVAIL;
break;
case RXRPC_SERVER_BOUND:
case RXRPC_SERVER_BOUND2:
ASSERT(rx->local != NULL);
max = READ_ONCE(rxrpc_max_backlog);
ret = -EINVAL;
if (backlog == INT_MAX)
backlog = max;
else if (backlog < 0 || backlog > max)
break;
old = sk->sk_max_ack_backlog;
sk->sk_max_ack_backlog = backlog;
ret = rxrpc_service_prealloc(rx, GFP_KERNEL);
if (ret == 0)
rx->sk.sk_state = RXRPC_SERVER_LISTENING;
else
sk->sk_max_ack_backlog = old;
break;
case RXRPC_SERVER_LISTENING:
if (backlog == 0) {
rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED;
sk->sk_max_ack_backlog = 0;
rxrpc_discard_prealloc(rx);
ret = 0;
break;
}
/* Fall through */
default:
ret = -EBUSY;
break;
}
release_sock(&rx->sk);
_leave(" = %d", ret);
return ret;
}
/**
* 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
* @key: The security context to use (defaults to socket setting)
* @user_call_ID: The ID to use
* @tx_total_len: Total length of data to transmit during the call (or -1)
* @gfp: The allocation constraints
* @notify_rx: Where to send notifications instead of socket queue
* @upgrade: Request service upgrade for call
* @debug_id: The debug ID for tracing to be assigned to the call
*
* 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,
s64 tx_total_len,
gfp_t gfp,
rxrpc_notify_rx_t notify_rx,
bool upgrade,
unsigned int debug_id)
{
struct rxrpc_conn_parameters cp;
struct rxrpc_call_params p;
struct rxrpc_call *call;
struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
int ret;
_enter(",,%x,%lx", key_serial(key), user_call_ID);
ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
if (ret < 0)
return ERR_PTR(ret);
lock_sock(&rx->sk);
if (!key)
key = rx->key;
if (key && !key->payload.data[0])
key = NULL; /* a no-security key */
memset(&p, 0, sizeof(p));
p.user_call_ID = user_call_ID;
p.tx_total_len = tx_total_len;
memset(&cp, 0, sizeof(cp));
cp.local = rx->local;
cp.key = key;
cp.security_level = rx->min_sec_level;
cp.exclusive = false;
cp.upgrade = upgrade;
cp.service_id = srx->srx_service;
call = rxrpc_new_client_call(rx, &cp, srx, &p, gfp, debug_id);
/* The socket has been unlocked. */
if (!IS_ERR(call)) {
call->notify_rx = notify_rx;
mutex_unlock(&call->user_mutex);
}
rxrpc_put_peer(cp.peer);
_leave(" = %p", call);
return call;
}
EXPORT_SYMBOL(rxrpc_kernel_begin_call);
/*
* Dummy function used to stop the notifier talking to recvmsg().
*/
static void rxrpc_dummy_notify_rx(struct sock *sk, struct rxrpc_call *rxcall,
unsigned long call_user_ID)
{
}
/**
* rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
* @sock: The socket the call is on
* @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 socket *sock, struct rxrpc_call *call)
{
_enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
mutex_lock(&call->user_mutex);
rxrpc_release_call(rxrpc_sk(sock->sk), call);
/* Make sure we're not going to call back into a kernel service */
if (call->notify_rx) {
spin_lock_bh(&call->notify_lock);
call->notify_rx = rxrpc_dummy_notify_rx;
spin_unlock_bh(&call->notify_lock);
}
mutex_unlock(&call->user_mutex);
rxrpc_put_call(call, rxrpc_call_put_kernel);
}
EXPORT_SYMBOL(rxrpc_kernel_end_call);
/**
* rxrpc_kernel_check_life - Check to see whether a call is still alive
* @sock: The socket the call is on
* @call: The call to check
*
* Allow a kernel service to find out whether a call is still alive - ie. we're
* getting ACKs from the server. Returns a number representing the life state
* which can be compared to that returned by a previous call.
*
* If the life state stalls, rxrpc_kernel_probe_life() should be called and
* then 2RTT waited.
*/
u32 rxrpc_kernel_check_life(const struct socket *sock,
const struct rxrpc_call *call)
{
return call->acks_latest;
}
EXPORT_SYMBOL(rxrpc_kernel_check_life);
/**
* rxrpc_kernel_probe_life - Poke the peer to see if it's still alive
* @sock: The socket the call is on
* @call: The call to check
*
* In conjunction with rxrpc_kernel_check_life(), allow a kernel service to
* find out whether a call is still alive by pinging it. This should cause the
* life state to be bumped in about 2*RTT.
*
* The must be called in TASK_RUNNING state on pain of might_sleep() objecting.
*/
void rxrpc_kernel_probe_life(struct socket *sock, struct rxrpc_call *call)
{
rxrpc_propose_ACK(call, RXRPC_ACK_PING, 0, 0, true, false,
rxrpc_propose_ack_ping_for_check_life);
rxrpc_send_ack_packet(call, true, NULL);
}
EXPORT_SYMBOL(rxrpc_kernel_probe_life);
/**
* rxrpc_kernel_get_epoch - Retrieve the epoch value from a call.
* @sock: The socket the call is on
* @call: The call to query
*
* Allow a kernel service to retrieve the epoch value from a service call to
* see if the client at the other end rebooted.
*/
u32 rxrpc_kernel_get_epoch(struct socket *sock, struct rxrpc_call *call)
{
return call->conn->proto.epoch;
}
EXPORT_SYMBOL(rxrpc_kernel_get_epoch);
/**
* rxrpc_kernel_check_call - Check a call's state
* @sock: The socket the call is on
* @call: The call to check
* @_compl: Where to store the completion state
* @_abort_code: Where to store any abort code
*
* Allow a kernel service to query the state of a call and find out the manner
* of its termination if it has completed. Returns -EINPROGRESS if the call is
* still going, 0 if the call finished successfully, -ECONNABORTED if the call
* was aborted and an appropriate error if the call failed in some other way.
*/
int rxrpc_kernel_check_call(struct socket *sock, struct rxrpc_call *call,
enum rxrpc_call_completion *_compl, u32 *_abort_code)
{
if (call->state != RXRPC_CALL_COMPLETE)
return -EINPROGRESS;
smp_rmb();
*_compl = call->completion;
*_abort_code = call->abort_code;
return call->error;
}
EXPORT_SYMBOL(rxrpc_kernel_check_call);
/**
* rxrpc_kernel_retry_call - Allow a kernel service to retry a call
* @sock: The socket the call is on
* @call: The call to retry
* @srx: The address of the peer to contact
* @key: The security context to use (defaults to socket setting)
*
* Allow a kernel service to try resending a client call that failed due to a
* network error to a new address. The Tx queue is maintained intact, thereby
* relieving the need to re-encrypt any request data that has already been
* buffered.
*/
int rxrpc_kernel_retry_call(struct socket *sock, struct rxrpc_call *call,
struct sockaddr_rxrpc *srx, struct key *key)
{
struct rxrpc_conn_parameters cp;
struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
int ret;
_enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
if (!key)
key = rx->key;
if (key && !key->payload.data[0])
key = NULL; /* a no-security key */
memset(&cp, 0, sizeof(cp));
cp.local = rx->local;
cp.key = key;
cp.security_level = 0;
cp.exclusive = false;
cp.service_id = srx->srx_service;
mutex_lock(&call->user_mutex);
ret = rxrpc_prepare_call_for_retry(rx, call);
if (ret == 0)
ret = rxrpc_retry_client_call(rx, call, &cp, srx, GFP_KERNEL);
mutex_unlock(&call->user_mutex);
rxrpc_put_peer(cp.peer);
_leave(" = %d", ret);
return ret;
}
EXPORT_SYMBOL(rxrpc_kernel_retry_call);
/**
* rxrpc_kernel_new_call_notification - Get notifications of new calls
* @sock: The socket to intercept received messages on
* @notify_new_call: Function to be called when new calls appear
* @discard_new_call: Function to discard preallocated calls
*
* Allow a kernel service to be given notifications about new calls.
*/
void rxrpc_kernel_new_call_notification(
struct socket *sock,
rxrpc_notify_new_call_t notify_new_call,
rxrpc_discard_new_call_t discard_new_call)
{
struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
rx->notify_new_call = notify_new_call;
rx->discard_new_call = discard_new_call;
}
EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
/*
* 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 rxrpc_sock *rx = rxrpc_sk(sock->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);
ret = -EISCONN;
if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
goto error;
switch (rx->sk.sk_state) {
case RXRPC_UNBOUND:
rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
case RXRPC_CLIENT_UNBOUND:
case RXRPC_CLIENT_BOUND:
break;
default:
ret = -EBUSY;
goto error;
}
rx->connect_srx = *srx;
set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
ret = 0;
error:
release_sock(&rx->sk);
return ret;
}
/*
* 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 socket *sock, struct msghdr *m, size_t len)
{
struct rxrpc_local *local;
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;
}
}
lock_sock(&rx->sk);
switch (rx->sk.sk_state) {
case RXRPC_UNBOUND:
rx->srx.srx_family = AF_RXRPC;
rx->srx.srx_service = 0;
rx->srx.transport_type = SOCK_DGRAM;
rx->srx.transport.family = rx->family;
switch (rx->family) {
case AF_INET:
rx->srx.transport_len = sizeof(struct sockaddr_in);
break;
#ifdef CONFIG_AF_RXRPC_IPV6
case AF_INET6:
rx->srx.transport_len = sizeof(struct sockaddr_in6);
break;
#endif
default:
ret = -EAFNOSUPPORT;
goto error_unlock;
}
local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx);
if (IS_ERR(local)) {
ret = PTR_ERR(local);
goto error_unlock;
}
rx->local = local;
rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
/* Fall through */
case RXRPC_CLIENT_UNBOUND:
case RXRPC_CLIENT_BOUND:
if (!m->msg_name &&
test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
m->msg_name = &rx->connect_srx;
m->msg_namelen = sizeof(rx->connect_srx);
}
/* Fall through */
case RXRPC_SERVER_BOUND:
case RXRPC_SERVER_LISTENING:
ret = rxrpc_do_sendmsg(rx, m, len);
/* The socket has been unlocked */
goto out;
default:
ret = -EINVAL;
goto error_unlock;
}
error_unlock:
release_sock(&rx->sk);
out:
_leave(" = %d", ret);
return ret;
}
/*
* set RxRPC socket options
*/
static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
char __user *optval, unsigned int optlen)
{
struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
unsigned int min_sec_level;
u16 service_upgrade[2];
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_UNBOUND)
goto error;
rx->exclusive = true;
goto success;
case RXRPC_SECURITY_KEY:
ret = -EINVAL;
if (rx->key)
goto error;
ret = -EISCONN;
if (rx->sk.sk_state != RXRPC_UNBOUND)
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_UNBOUND)
goto error;
ret = rxrpc_server_keyring(rx, optval, optlen);
goto error;
case RXRPC_MIN_SECURITY_LEVEL:
ret = -EINVAL;
if (optlen != sizeof(unsigned int))
goto error;
ret = -EISCONN;
if (rx->sk.sk_state != RXRPC_UNBOUND)
goto error;
ret = get_user(min_sec_level,
(unsigned int __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;
case RXRPC_UPGRADEABLE_SERVICE:
ret = -EINVAL;
if (optlen != sizeof(service_upgrade) ||
rx->service_upgrade.from != 0)
goto error;
ret = -EISCONN;
if (rx->sk.sk_state != RXRPC_SERVER_BOUND2)
goto error;
ret = -EFAULT;
if (copy_from_user(service_upgrade, optval,
sizeof(service_upgrade)) != 0)
goto error;
ret = -EINVAL;
if ((service_upgrade[0] != rx->srx.srx_service ||
service_upgrade[1] != rx->second_service) &&
(service_upgrade[0] != rx->second_service ||
service_upgrade[1] != rx->srx.srx_service))
goto error;
rx->service_upgrade.from = service_upgrade[0];
rx->service_upgrade.to = service_upgrade[1];
goto success;
default:
break;
}
}
success:
ret = 0;
error:
release_sock(&rx->sk);
return ret;
}
/*
* Get socket options.
*/
static int rxrpc_getsockopt(struct socket *sock, int level, int optname,
char __user *optval, int __user *_optlen)
{
int optlen;
if (level != SOL_RXRPC)
return -EOPNOTSUPP;
if (get_user(optlen, _optlen))
return -EFAULT;
switch (optname) {
case RXRPC_SUPPORTED_CMSG:
if (optlen < sizeof(int))
return -ETOOSMALL;
if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) ||
put_user(sizeof(int), _optlen))
return -EFAULT;
return 0;
default:
return -EOPNOTSUPP;
}
}
/*
* permit an RxRPC socket to be polled
*/
static __poll_t rxrpc_poll(struct file *file, struct socket *sock,
poll_table *wait)
{
struct sock *sk = sock->sk;
struct rxrpc_sock *rx = rxrpc_sk(sk);
__poll_t mask;
sock_poll_wait(file, sock, wait);
mask = 0;
/* the socket is readable if there are any messages waiting on the Rx
* queue */
if (!list_empty(&rx->recvmsg_q))
mask |= EPOLLIN | EPOLLRDNORM;
/* 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 |= EPOLLOUT | EPOLLWRNORM;
return mask;
}
/*
* create an RxRPC socket
*/
static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
int kern)
{
struct rxrpc_net *rxnet;
struct rxrpc_sock *rx;
struct sock *sk;
_enter("%p,%d", sock, protocol);
/* we support transport protocol UDP/UDP6 only */
if (protocol != PF_INET &&
IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
return -EPROTONOSUPPORT;
if (sock->type != SOCK_DGRAM)
return -ESOCKTNOSUPPORT;
sock->ops = &rxrpc_rpc_ops;
sock->state = SS_UNCONNECTED;
sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
if (!sk)
return -ENOMEM;
sock_init_data(sock, sk);
sock_set_flag(sk, SOCK_RCU_FREE);
sk->sk_state = RXRPC_UNBOUND;
sk->sk_write_space = rxrpc_write_space;
sk->sk_max_ack_backlog = 0;
sk->sk_destruct = rxrpc_sock_destructor;
rx = rxrpc_sk(sk);
rx->family = protocol;
rx->calls = RB_ROOT;
spin_lock_init(&rx->incoming_lock);
INIT_LIST_HEAD(&rx->sock_calls);
INIT_LIST_HEAD(&rx->to_be_accepted);
INIT_LIST_HEAD(&rx->recvmsg_q);
rwlock_init(&rx->recvmsg_lock);
rwlock_init(&rx->call_lock);
memset(&rx->srx, 0, sizeof(rx->srx));
rxnet = rxrpc_net(sock_net(&rx->sk));
timer_reduce(&rxnet->peer_keepalive_timer, jiffies + 1);
_leave(" = 0 [%p]", rx);
return 0;
}
/*
* Kill all the calls on a socket and shut it down.
*/
static int rxrpc_shutdown(struct socket *sock, int flags)
{
struct sock *sk = sock->sk;
struct rxrpc_sock *rx = rxrpc_sk(sk);
int ret = 0;
_enter("%p,%d", sk, flags);
if (flags != SHUT_RDWR)
return -EOPNOTSUPP;
if (sk->sk_state == RXRPC_CLOSE)
return -ESHUTDOWN;
lock_sock(sk);
spin_lock_bh(&sk->sk_receive_queue.lock);
if (sk->sk_state < RXRPC_CLOSE) {
sk->sk_state = RXRPC_CLOSE;
sk->sk_shutdown = SHUTDOWN_MASK;
} else {
ret = -ESHUTDOWN;
}
spin_unlock_bh(&sk->sk_receive_queue.lock);
rxrpc_discard_prealloc(rx);
release_sock(sk);
return ret;
}
/*
* RxRPC socket destructor
*/
static void rxrpc_sock_destructor(struct sock *sk)
{
_enter("%p", sk);
rxrpc_purge_queue(&sk->sk_receive_queue);
WARN_ON(refcount_read(&sk->sk_wmem_alloc));
WARN_ON(!sk_unhashed(sk));
WARN_ON(sk->sk_socket);
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);
struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
_enter("%p{%d,%d}", sk, sk->sk_state, refcount_read(&sk->sk_refcnt));
/* declare the socket closed for business */
sock_orphan(sk);
sk->sk_shutdown = SHUTDOWN_MASK;
/* We want to kill off all connections from a service socket
* as fast as possible because we can't share these; client
* sockets, on the other hand, can share an endpoint.
*/
switch (sk->sk_state) {
case RXRPC_SERVER_BOUND:
case RXRPC_SERVER_BOUND2:
case RXRPC_SERVER_LISTENING:
case RXRPC_SERVER_LISTEN_DISABLED:
rx->local->service_closed = true;
break;
}
spin_lock_bh(&sk->sk_receive_queue.lock);
sk->sk_state = RXRPC_CLOSE;
spin_unlock_bh(&sk->sk_receive_queue.lock);
if (rx->local && rcu_access_pointer(rx->local->service) == rx) {
write_lock(&rx->local->services_lock);
rcu_assign_pointer(rx->local->service, NULL);
write_unlock(&rx->local->services_lock);
}
/* try to flush out this socket */
rxrpc_discard_prealloc(rx);
rxrpc_release_calls_on_socket(rx);
flush_workqueue(rxrpc_workqueue);
rxrpc_purge_queue(&sk->sk_receive_queue);
rxrpc_queue_work(&rxnet->service_conn_reaper);
rxrpc_queue_work(&rxnet->client_conn_reaper);
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_RXRPC,
.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 = rxrpc_shutdown,
.setsockopt = rxrpc_setsockopt,
.getsockopt = rxrpc_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,