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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Gustavo A. R. Silva](/assets/img/avatar_default.png)
In preparation to enable -Wimplicit-fallthrough for Clang, fix a warning by explicitly adding a break statement instead of letting the code fall through to the next case. Link: https://github.com/KSPP/linux/issues/115 Reviewed-by: Jeffrey Altman <jaltman@auristor.com> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
1078 lines
25 KiB
C
1078 lines
25 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* AF_RXRPC implementation
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/net.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/random.h>
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#include <linux/poll.h>
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#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>
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#include <net/af_rxrpc.h>
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#define CREATE_TRACE_POINTS
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#include "ar-internal.h"
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MODULE_DESCRIPTION("RxRPC network protocol");
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MODULE_AUTHOR("Red Hat, Inc.");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_NETPROTO(PF_RXRPC);
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unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
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module_param_named(debug, rxrpc_debug, uint, 0644);
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MODULE_PARM_DESC(debug, "RxRPC debugging mask");
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static struct proto rxrpc_proto;
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static const struct proto_ops rxrpc_rpc_ops;
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/* current debugging ID */
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atomic_t rxrpc_debug_id;
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EXPORT_SYMBOL(rxrpc_debug_id);
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/* count of skbs currently in use */
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atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
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struct workqueue_struct *rxrpc_workqueue;
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static void rxrpc_sock_destructor(struct sock *);
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/*
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* see if an RxRPC socket is currently writable
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*/
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static inline int rxrpc_writable(struct sock *sk)
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{
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return refcount_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
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}
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/*
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* wait for write bufferage to become available
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*/
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static void rxrpc_write_space(struct sock *sk)
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{
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_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);
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if (skwq_has_sleeper(wq))
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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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}
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/*
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* validate an RxRPC address
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*/
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static int rxrpc_validate_address(struct rxrpc_sock *rx,
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struct sockaddr_rxrpc *srx,
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int len)
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{
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unsigned int tail;
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if (len < sizeof(struct sockaddr_rxrpc))
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return -EINVAL;
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if (srx->srx_family != AF_RXRPC)
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return -EAFNOSUPPORT;
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if (srx->transport_type != SOCK_DGRAM)
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return -ESOCKTNOSUPPORT;
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len -= offsetof(struct sockaddr_rxrpc, transport);
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if (srx->transport_len < sizeof(sa_family_t) ||
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srx->transport_len > len)
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return -EINVAL;
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if (srx->transport.family != rx->family &&
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srx->transport.family == AF_INET && rx->family != AF_INET6)
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return -EAFNOSUPPORT;
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switch (srx->transport.family) {
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case AF_INET:
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if (srx->transport_len < sizeof(struct sockaddr_in))
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return -EINVAL;
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tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
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break;
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#ifdef CONFIG_AF_RXRPC_IPV6
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case AF_INET6:
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if (srx->transport_len < sizeof(struct sockaddr_in6))
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return -EINVAL;
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tail = offsetof(struct sockaddr_rxrpc, transport) +
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sizeof(struct sockaddr_in6);
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break;
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#endif
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default:
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return -EAFNOSUPPORT;
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}
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if (tail < len)
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memset((void *)srx + tail, 0, len - tail);
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_debug("INET: %pISp", &srx->transport);
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return 0;
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}
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/*
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* bind a local address to an RxRPC socket
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*/
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static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
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{
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struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
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struct rxrpc_local *local;
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struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
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u16 service_id;
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int ret;
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_enter("%p,%p,%d", rx, saddr, len);
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ret = rxrpc_validate_address(rx, srx, len);
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if (ret < 0)
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goto error;
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service_id = srx->srx_service;
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lock_sock(&rx->sk);
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switch (rx->sk.sk_state) {
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case RXRPC_UNBOUND:
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rx->srx = *srx;
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local = rxrpc_lookup_local(sock_net(&rx->sk), &rx->srx);
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if (IS_ERR(local)) {
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ret = PTR_ERR(local);
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goto error_unlock;
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}
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if (service_id) {
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write_lock(&local->services_lock);
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if (rcu_access_pointer(local->service))
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goto service_in_use;
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rx->local = local;
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rcu_assign_pointer(local->service, rx);
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write_unlock(&local->services_lock);
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rx->sk.sk_state = RXRPC_SERVER_BOUND;
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} else {
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rx->local = local;
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rx->sk.sk_state = RXRPC_CLIENT_BOUND;
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}
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break;
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case RXRPC_SERVER_BOUND:
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ret = -EINVAL;
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if (service_id == 0)
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goto error_unlock;
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ret = -EADDRINUSE;
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if (service_id == rx->srx.srx_service)
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goto error_unlock;
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ret = -EINVAL;
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srx->srx_service = rx->srx.srx_service;
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if (memcmp(srx, &rx->srx, sizeof(*srx)) != 0)
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goto error_unlock;
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rx->second_service = service_id;
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rx->sk.sk_state = RXRPC_SERVER_BOUND2;
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break;
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default:
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ret = -EINVAL;
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goto error_unlock;
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}
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release_sock(&rx->sk);
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_leave(" = 0");
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return 0;
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service_in_use:
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write_unlock(&local->services_lock);
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rxrpc_unuse_local(local);
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rxrpc_put_local(local);
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ret = -EADDRINUSE;
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error_unlock:
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release_sock(&rx->sk);
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error:
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_leave(" = %d", ret);
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return ret;
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}
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/*
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* set the number of pending calls permitted on a listening socket
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*/
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static int rxrpc_listen(struct socket *sock, int backlog)
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{
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struct sock *sk = sock->sk;
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struct rxrpc_sock *rx = rxrpc_sk(sk);
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unsigned int max, old;
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int ret;
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_enter("%p,%d", rx, backlog);
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lock_sock(&rx->sk);
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switch (rx->sk.sk_state) {
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case RXRPC_UNBOUND:
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ret = -EADDRNOTAVAIL;
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break;
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case RXRPC_SERVER_BOUND:
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case RXRPC_SERVER_BOUND2:
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ASSERT(rx->local != NULL);
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max = READ_ONCE(rxrpc_max_backlog);
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ret = -EINVAL;
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if (backlog == INT_MAX)
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backlog = max;
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else if (backlog < 0 || backlog > max)
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break;
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old = sk->sk_max_ack_backlog;
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sk->sk_max_ack_backlog = backlog;
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ret = rxrpc_service_prealloc(rx, GFP_KERNEL);
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if (ret == 0)
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rx->sk.sk_state = RXRPC_SERVER_LISTENING;
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else
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sk->sk_max_ack_backlog = old;
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break;
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case RXRPC_SERVER_LISTENING:
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if (backlog == 0) {
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rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED;
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sk->sk_max_ack_backlog = 0;
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rxrpc_discard_prealloc(rx);
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ret = 0;
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break;
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}
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fallthrough;
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default:
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ret = -EBUSY;
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break;
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}
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release_sock(&rx->sk);
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_leave(" = %d", ret);
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return ret;
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}
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/**
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* rxrpc_kernel_begin_call - Allow a kernel service to begin a call
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* @sock: The socket on which to make the call
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* @srx: The address of the peer to contact
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* @key: The security context to use (defaults to socket setting)
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* @user_call_ID: The ID to use
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* @tx_total_len: Total length of data to transmit during the call (or -1)
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* @gfp: The allocation constraints
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* @notify_rx: Where to send notifications instead of socket queue
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* @upgrade: Request service upgrade for call
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* @interruptibility: The call is interruptible, or can be canceled.
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* @debug_id: The debug ID for tracing to be assigned to the call
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*
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* Allow a kernel service to begin a call on the nominated socket. This just
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* sets up all the internal tracking structures and allocates connection and
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* call IDs as appropriate. The call to be used is returned.
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*
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* The default socket destination address and security may be overridden by
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* supplying @srx and @key.
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*/
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struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
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struct sockaddr_rxrpc *srx,
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struct key *key,
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unsigned long user_call_ID,
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s64 tx_total_len,
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gfp_t gfp,
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rxrpc_notify_rx_t notify_rx,
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bool upgrade,
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enum rxrpc_interruptibility interruptibility,
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unsigned int debug_id)
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{
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struct rxrpc_conn_parameters cp;
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struct rxrpc_call_params p;
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struct rxrpc_call *call;
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struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
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int ret;
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_enter(",,%x,%lx", key_serial(key), user_call_ID);
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ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
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if (ret < 0)
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return ERR_PTR(ret);
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lock_sock(&rx->sk);
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if (!key)
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key = rx->key;
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if (key && !key->payload.data[0])
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key = NULL; /* a no-security key */
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memset(&p, 0, sizeof(p));
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p.user_call_ID = user_call_ID;
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p.tx_total_len = tx_total_len;
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p.interruptibility = interruptibility;
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p.kernel = true;
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memset(&cp, 0, sizeof(cp));
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cp.local = rx->local;
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cp.key = key;
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cp.security_level = rx->min_sec_level;
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cp.exclusive = false;
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cp.upgrade = upgrade;
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cp.service_id = srx->srx_service;
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call = rxrpc_new_client_call(rx, &cp, srx, &p, gfp, debug_id);
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/* The socket has been unlocked. */
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if (!IS_ERR(call)) {
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call->notify_rx = notify_rx;
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mutex_unlock(&call->user_mutex);
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}
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rxrpc_put_peer(cp.peer);
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_leave(" = %p", call);
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return call;
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}
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EXPORT_SYMBOL(rxrpc_kernel_begin_call);
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/*
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* Dummy function used to stop the notifier talking to recvmsg().
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*/
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static void rxrpc_dummy_notify_rx(struct sock *sk, struct rxrpc_call *rxcall,
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unsigned long call_user_ID)
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{
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}
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/**
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* rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
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* @sock: The socket the call is on
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* @call: The call to end
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*
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* Allow a kernel service to end a call it was using. The call must be
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* complete before this is called (the call should be aborted if necessary).
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*/
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void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
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{
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_enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
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mutex_lock(&call->user_mutex);
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rxrpc_release_call(rxrpc_sk(sock->sk), call);
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/* Make sure we're not going to call back into a kernel service */
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if (call->notify_rx) {
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spin_lock_bh(&call->notify_lock);
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call->notify_rx = rxrpc_dummy_notify_rx;
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spin_unlock_bh(&call->notify_lock);
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}
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mutex_unlock(&call->user_mutex);
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rxrpc_put_call(call, rxrpc_call_put_kernel);
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}
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EXPORT_SYMBOL(rxrpc_kernel_end_call);
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/**
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* rxrpc_kernel_check_life - Check to see whether a call is still alive
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* @sock: The socket the call is on
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* @call: The call to check
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*
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* Allow a kernel service to find out whether a call is still alive -
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* ie. whether it has completed.
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*/
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bool rxrpc_kernel_check_life(const struct socket *sock,
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const struct rxrpc_call *call)
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{
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return call->state != RXRPC_CALL_COMPLETE;
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}
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EXPORT_SYMBOL(rxrpc_kernel_check_life);
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/**
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* rxrpc_kernel_get_epoch - Retrieve the epoch value from a call.
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* @sock: The socket the call is on
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* @call: The call to query
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*
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* Allow a kernel service to retrieve the epoch value from a service call to
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* see if the client at the other end rebooted.
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*/
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u32 rxrpc_kernel_get_epoch(struct socket *sock, struct rxrpc_call *call)
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{
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return call->conn->proto.epoch;
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}
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EXPORT_SYMBOL(rxrpc_kernel_get_epoch);
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|
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/**
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* rxrpc_kernel_new_call_notification - Get notifications of new calls
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* @sock: The socket to intercept received messages on
|
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* @notify_new_call: Function to be called when new calls appear
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* @discard_new_call: Function to discard preallocated calls
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*
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* Allow a kernel service to be given notifications about new calls.
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*/
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void rxrpc_kernel_new_call_notification(
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struct socket *sock,
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rxrpc_notify_new_call_t notify_new_call,
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rxrpc_discard_new_call_t discard_new_call)
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{
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struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
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rx->notify_new_call = notify_new_call;
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rx->discard_new_call = discard_new_call;
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}
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EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
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|
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/**
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* rxrpc_kernel_set_max_life - Set maximum lifespan on a call
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* @sock: The socket the call is on
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* @call: The call to configure
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* @hard_timeout: The maximum lifespan of the call in jiffies
|
|
*
|
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* Set the maximum lifespan of a call. The call will end with ETIME or
|
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* ETIMEDOUT if it takes longer than this.
|
|
*/
|
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void rxrpc_kernel_set_max_life(struct socket *sock, struct rxrpc_call *call,
|
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unsigned long hard_timeout)
|
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{
|
|
unsigned long now;
|
|
|
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mutex_lock(&call->user_mutex);
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|
|
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now = jiffies;
|
|
hard_timeout += now;
|
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WRITE_ONCE(call->expect_term_by, hard_timeout);
|
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rxrpc_reduce_call_timer(call, hard_timeout, now, rxrpc_timer_set_for_hard);
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|
|
|
mutex_unlock(&call->user_mutex);
|
|
}
|
|
EXPORT_SYMBOL(rxrpc_kernel_set_max_life);
|
|
|
|
/*
|
|
* 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;
|
|
break;
|
|
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:
|
|
case RXRPC_CLIENT_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_BOUND;
|
|
fallthrough;
|
|
|
|
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);
|
|
}
|
|
fallthrough;
|
|
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;
|
|
}
|
|
|
|
int rxrpc_sock_set_min_security_level(struct sock *sk, unsigned int val)
|
|
{
|
|
if (sk->sk_state != RXRPC_UNBOUND)
|
|
return -EISCONN;
|
|
if (val > RXRPC_SECURITY_MAX)
|
|
return -EINVAL;
|
|
lock_sock(sk);
|
|
rxrpc_sk(sk)->min_sec_level = val;
|
|
release_sock(sk);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(rxrpc_sock_set_min_security_level);
|
|
|
|
/*
|
|
* set RxRPC socket options
|
|
*/
|
|
static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
|
|
sockptr_t 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 = copy_from_sockptr(&min_sec_level, optval,
|
|
sizeof(unsigned int));
|
|
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_sockptr(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);
|
|
|
|
_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_unuse_local(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_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,
|
|
.obj_size = sizeof(struct rxrpc_sock),
|
|
.max_header = sizeof(struct rxrpc_wire_header),
|
|
};
|
|
|
|
static const struct net_proto_family rxrpc_family_ops = {
|
|
.family = PF_RXRPC,
|
|
.create = rxrpc_create,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
/*
|
|
* initialise and register the RxRPC protocol
|
|
*/
|
|
static int __init af_rxrpc_init(void)
|
|
{
|
|
int ret = -1;
|
|
unsigned int tmp;
|
|
|
|
BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof_field(struct sk_buff, cb));
|
|
|
|
get_random_bytes(&tmp, sizeof(tmp));
|
|
tmp &= 0x3fffffff;
|
|
if (tmp == 0)
|
|
tmp = 1;
|
|
idr_set_cursor(&rxrpc_client_conn_ids, tmp);
|
|
|
|
ret = -ENOMEM;
|
|
rxrpc_call_jar = kmem_cache_create(
|
|
"rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!rxrpc_call_jar) {
|
|
pr_notice("Failed to allocate call jar\n");
|
|
goto error_call_jar;
|
|
}
|
|
|
|
rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
|
|
if (!rxrpc_workqueue) {
|
|
pr_notice("Failed to allocate work queue\n");
|
|
goto error_work_queue;
|
|
}
|
|
|
|
ret = rxrpc_init_security();
|
|
if (ret < 0) {
|
|
pr_crit("Cannot initialise security\n");
|
|
goto error_security;
|
|
}
|
|
|
|
ret = register_pernet_device(&rxrpc_net_ops);
|
|
if (ret)
|
|
goto error_pernet;
|
|
|
|
ret = proto_register(&rxrpc_proto, 1);
|
|
if (ret < 0) {
|
|
pr_crit("Cannot register protocol\n");
|
|
goto error_proto;
|
|
}
|
|
|
|
ret = sock_register(&rxrpc_family_ops);
|
|
if (ret < 0) {
|
|
pr_crit("Cannot register socket family\n");
|
|
goto error_sock;
|
|
}
|
|
|
|
ret = register_key_type(&key_type_rxrpc);
|
|
if (ret < 0) {
|
|
pr_crit("Cannot register client key type\n");
|
|
goto error_key_type;
|
|
}
|
|
|
|
ret = register_key_type(&key_type_rxrpc_s);
|
|
if (ret < 0) {
|
|
pr_crit("Cannot register server key type\n");
|
|
goto error_key_type_s;
|
|
}
|
|
|
|
ret = rxrpc_sysctl_init();
|
|
if (ret < 0) {
|
|
pr_crit("Cannot register sysctls\n");
|
|
goto error_sysctls;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error_sysctls:
|
|
unregister_key_type(&key_type_rxrpc_s);
|
|
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:
|
|
unregister_pernet_device(&rxrpc_net_ops);
|
|
error_pernet:
|
|
rxrpc_exit_security();
|
|
error_security:
|
|
destroy_workqueue(rxrpc_workqueue);
|
|
error_work_queue:
|
|
kmem_cache_destroy(rxrpc_call_jar);
|
|
error_call_jar:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* unregister the RxRPC protocol
|
|
*/
|
|
static void __exit af_rxrpc_exit(void)
|
|
{
|
|
_enter("");
|
|
rxrpc_sysctl_exit();
|
|
unregister_key_type(&key_type_rxrpc_s);
|
|
unregister_key_type(&key_type_rxrpc);
|
|
sock_unregister(PF_RXRPC);
|
|
proto_unregister(&rxrpc_proto);
|
|
unregister_pernet_device(&rxrpc_net_ops);
|
|
ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0);
|
|
ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
|
|
|
|
/* Make sure the local and peer records pinned by any dying connections
|
|
* are released.
|
|
*/
|
|
rcu_barrier();
|
|
rxrpc_destroy_client_conn_ids();
|
|
|
|
destroy_workqueue(rxrpc_workqueue);
|
|
rxrpc_exit_security();
|
|
kmem_cache_destroy(rxrpc_call_jar);
|
|
_leave("");
|
|
}
|
|
|
|
module_init(af_rxrpc_init);
|
|
module_exit(af_rxrpc_exit);
|