| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* AF_RXRPC implementation |
| * |
| * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| * Written by David Howells (dhowells@redhat.com) |
| */ |
| |
| #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_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; |
| int ret; |
| |
| _enter("%p,%p,%d", rx, saddr, len); |
| |
| ret = rxrpc_validate_address(rx, srx, len); |
| if (ret < 0) |
| goto error; |
| service_id = srx->srx_service; |
| |
| 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_unuse_local(local); |
| 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; |
| } |
| fallthrough; |
| 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 |
| * @interruptibility: The call is interruptible, or can be canceled. |
| * @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, |
| enum rxrpc_interruptibility interruptibility, |
| 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; |
| p.interruptibility = interruptibility; |
| p.kernel = true; |
| |
| 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, refcount_read(&call->ref)); |
| |
| 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. whether it has completed. |
| */ |
| bool rxrpc_kernel_check_life(const struct socket *sock, |
| const struct rxrpc_call *call) |
| { |
| return call->state != RXRPC_CALL_COMPLETE; |
| } |
| EXPORT_SYMBOL(rxrpc_kernel_check_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_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); |
| |
| /** |
| * rxrpc_kernel_set_max_life - Set maximum lifespan on a call |
| * @sock: The socket the call is on |
| * @call: The call to configure |
| * @hard_timeout: The maximum lifespan of the call in jiffies |
| * |
| * Set the maximum lifespan of a call. The call will end with ETIME or |
| * ETIMEDOUT if it takes longer than this. |
| */ |
| void rxrpc_kernel_set_max_life(struct socket *sock, struct rxrpc_call *call, |
| unsigned long hard_timeout) |
| { |
| unsigned long now; |
| |
| mutex_lock(&call->user_mutex); |
| |
| now = jiffies; |
| hard_timeout += now; |
| WRITE_ONCE(call->expect_term_by, hard_timeout); |
| rxrpc_reduce_call_timer(call, hard_timeout, now, rxrpc_timer_set_for_hard); |
| |
| 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", WQ_HIGHPRI | WQ_MEM_RECLAIM | WQ_UNBOUND, 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_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); |