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Diffstat (limited to 'net/rxrpc/af_rxrpc.c')
-rw-r--r--net/rxrpc/af_rxrpc.c1097
1 files changed, 1097 insertions, 0 deletions
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
new file mode 100644
index 000000000..fb7e3fffc
--- /dev/null
+++ b/net/rxrpc/af_rxrpc.c
@@ -0,0 +1,1097 @@
+/* AF_RXRPC implementation
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#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)
+ 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_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;
+ }
+ /* 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 this is a client call, ping ACKs will be sent to the server to find out
+ * whether it's still responsive and whether the call is still alive on the
+ * server.
+ */
+u32 rxrpc_kernel_check_life(struct socket *sock, struct rxrpc_call *call)
+{
+ return call->acks_latest;
+}
+EXPORT_SYMBOL(rxrpc_kernel_check_life);
+
+/**
+ * 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:
+ 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;
+ /* Fall through */
+
+ 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);
+
+ _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) > FIELD_SIZEOF(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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-29 05:01:36 +0000