cregit-Linux how code gets into the kernel

Release 4.8 net/rxrpc/af_rxrpc.c

Directory: net/rxrpc
/* AF_RXRPC implementation
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (
 * 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/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>
#include "ar-internal.h"

MODULE_DESCRIPTION("RxRPC network protocol");
MODULE_AUTHOR("Red Hat, Inc.");


unsigned int rxrpc_debug; 
module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
MODULE_PARM_DESC(debug, "RxRPC debugging mask");

static struct proto rxrpc_proto;

static const struct proto_ops rxrpc_rpc_ops;

/* local epoch for detecting local-end reset */

u32 rxrpc_epoch;

/* current debugging ID */

atomic_t rxrpc_debug_id;

/* count of skbs currently in use */

atomic_t rxrpc_n_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 atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; }


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/* * 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(); }


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/* * 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-> != rx->family) return -EAFNOSUPPORT; switch (srx-> { case AF_INET: if (srx->transport_len < sizeof(struct sockaddr_in)) return -EINVAL; _debug("INET: %x @ %pI4", ntohs(srx->transport.sin.sin_port), &srx->transport.sin.sin_addr); tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad); break; case AF_INET6: default: return -EAFNOSUPPORT; } if (tail < len) memset((void *)srx + tail, 0, len - tail); return 0; }


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/* * bind a local address to an RxRPC socket */
static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) { struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr; struct sock *sk = sock->sk; struct rxrpc_local *local; struct rxrpc_sock *rx = rxrpc_sk(sk), *prx; int ret; _enter("%p,%p,%d", rx, saddr, len); ret = rxrpc_validate_address(rx, srx, len); if (ret < 0) goto error; lock_sock(&rx->sk); if (rx->sk.sk_state != RXRPC_UNBOUND) { ret = -EINVAL; goto error_unlock; } memcpy(&rx->srx, srx, sizeof(rx->srx)); local = rxrpc_lookup_local(&rx->srx); if (IS_ERR(local)) { ret = PTR_ERR(local); goto error_unlock; } if (rx->srx.srx_service) { write_lock_bh(&local->services_lock); list_for_each_entry(prx, &local->services, listen_link) { if (prx->srx.srx_service == rx->srx.srx_service) goto service_in_use; } rx->local = local; list_add_tail(&rx->listen_link, &local->services); write_unlock_bh(&local->services_lock); rx->sk.sk_state = RXRPC_SERVER_BOUND; } else { rx->local = local; rx->sk.sk_state = RXRPC_CLIENT_BOUND; } release_sock(&rx->sk); _leave(" = 0"); return 0; service_in_use: write_unlock_bh(&local->services_lock); rxrpc_put_local(local); ret = -EADDRINUSE; error_unlock: release_sock(&rx->sk); error: _leave(" = %d", ret); return ret; }


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/* * 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; 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: 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; sk->sk_max_ack_backlog = backlog; rx->sk.sk_state = RXRPC_SERVER_LISTENING; ret = 0; break; default: ret = -EBUSY; break; } release_sock(&rx->sk); _leave(" = %d", ret); return ret; }


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/** * rxrpc_kernel_begin_call - Allow a kernel service to begin a call * @sock: The socket on which to make the call * @srx: The address of the peer to contact * @key: The security context to use (defaults to socket setting) * @user_call_ID: The ID to use * * Allow a kernel service to begin a call on the nominated socket. This just * sets up all the internal tracking structures and allocates connection and * call IDs as appropriate. The call to be used is returned. * * The default socket destination address and security may be overridden by * supplying @srx and @key. */
struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, struct sockaddr_rxrpc *srx, struct key *key, unsigned long user_call_ID, gfp_t gfp) { struct rxrpc_conn_parameters cp; 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->[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; call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp); release_sock(&rx->sk); _leave(" = %p", call); return call; }


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EXPORT_SYMBOL(rxrpc_kernel_begin_call); /** * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using * @call: The call to end * * Allow a kernel service to end a call it was using. The call must be * complete before this is called (the call should be aborted if necessary). */
void rxrpc_kernel_end_call(struct rxrpc_call *call) { _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); rxrpc_remove_user_ID(call->socket, call); rxrpc_put_call(call); }


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EXPORT_SYMBOL(rxrpc_kernel_end_call); /** * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages * @sock: The socket to intercept received messages on * @interceptor: The function to pass the messages to * * Allow a kernel service to intercept messages heading for the Rx queue on an * RxRPC socket. They get passed to the specified function instead. * @interceptor should free the socket buffers it is given. @interceptor is * called with the socket receive queue spinlock held and softirqs disabled - * this ensures that the messages will be delivered in the right order. */
void rxrpc_kernel_intercept_rx_messages(struct socket *sock, rxrpc_interceptor_t interceptor) { struct rxrpc_sock *rx = rxrpc_sk(sock->sk); _enter(""); rx->interceptor = interceptor; }


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EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages); /* * 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; }


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/* * 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: local = rxrpc_lookup_local(&rx->srx); if (IS_ERR(local)) { ret = PTR_ERR(local); goto error_unlock; } rx->local = local; rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; /* Fall through */ case RXRPC_CLIENT_UNBOUND: case RXRPC_CLIENT_BOUND: if (!m->msg_name && test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) { m->msg_name = &rx->connect_srx; m->msg_namelen = sizeof(rx->connect_srx); } case RXRPC_SERVER_BOUND: case RXRPC_SERVER_LISTENING: ret = rxrpc_do_sendmsg(rx, m, len); break; default: ret = -EINVAL; break; } error_unlock: release_sock(&rx->sk); _leave(" = %d", ret); return ret; }


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


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/* * permit an RxRPC socket to be polled */
static unsigned int rxrpc_poll(struct file *file, struct socket *sock, poll_table *wait) { unsigned int mask; struct sock *sk = sock->sk; sock_poll_wait(file, sk_sleep(sk), wait); mask = 0; /* the socket is readable if there are any messages waiting on the Rx * queue */ if (!skb_queue_empty(&sk->sk_receive_queue)) mask |= POLLIN | POLLRDNORM; /* the socket is writable if there is space to add new data to the * socket; there is no guarantee that any particular call in progress * on the socket may have space in the Tx ACK window */ if (rxrpc_writable(sk)) mask |= POLLOUT | POLLWRNORM; return mask; }


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/* * create an RxRPC socket */
static int rxrpc_create(struct net *net, struct socket *sock, int protocol, int kern) { struct rxrpc_sock *rx; struct sock *sk; _enter("%p,%d", sock, protocol); if (!net_eq(net, &init_net)) return -EAFNOSUPPORT; /* we support transport protocol UDP/UDP6 only */ if (protocol != PF_INET) 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); 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; INIT_LIST_HEAD(&rx->listen_link); INIT_LIST_HEAD(&rx->secureq); INIT_LIST_HEAD(&rx->acceptq); rwlock_init(&rx->call_lock); memset(&rx->srx, 0, sizeof(rx->srx)); _leave(" = 0 [%p]", rx); return 0; }


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/* * RxRPC socket destructor */
static void rxrpc_sock_destructor(struct sock *sk) { _enter("%p", sk); rxrpc_purge_queue(&sk->sk_receive_queue); WARN_ON(atomic_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; } }


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/* * release an RxRPC socket */
static int rxrpc_release_sock(struct sock *sk) { struct rxrpc_sock *rx = rxrpc_sk(sk); _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); /* declare the socket closed for business */ sock_orphan(sk); sk->sk_shutdown = SHUTDOWN_MASK; spin_lock_bh(&sk->sk_receive_queue.lock); sk->sk_state = RXRPC_CLOSE; spin_unlock_bh(&sk->sk_receive_queue.lock); ASSERTCMP(rx->, !=, LIST_POISON1); if (!list_empty(&rx->listen_link)) { write_lock_bh(&rx->local->services_lock); list_del(&rx->listen_link); write_unlock_bh(&rx->local->services_lock); } /* try to flush out this socket */ rxrpc_release_calls_on_socket(rx); flush_workqueue(rxrpc_workqueue); rxrpc_purge_queue(&sk->sk_receive_queue); 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; }


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/* * 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); }


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/* * 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