/* * net/tipc/socket.c: TIPC socket API * * Copyright (c) 2001-2006, Ericsson AB * Copyright (c) 2004-2006, Wind River Systems * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the names of the copyright holders nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include <linux/module.h>#include <linux/types.h>#include <linux/net.h>#include <linux/socket.h>#include <linux/errno.h>#include <linux/mm.h>#include <linux/slab.h>#include <linux/poll.h>#include <linux/fcntl.h>#include <asm/semaphore.h>#include <asm/string.h>#include <asm/atomic.h>#include <net/sock.h> #include <linux/tipc.h>#include <linux/tipc_config.h>#include <net/tipc/tipc_msg.h>#include <net/tipc/tipc_port.h> #include "core.h" #define SS_LISTENING -1 /* socket is listening */#define SS_READY -2 /* socket is connectionless */ #define OVERLOAD_LIMIT_BASE 5000 struct tipc_sock { struct sock sk; struct tipc_port *p; struct semaphore sem;}; #define tipc_sk(sk) ((struct tipc_sock*)sk) static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);static void wakeupdispatch(struct tipc_port *tport); static struct proto_ops packet_ops;static struct proto_ops stream_ops;static struct proto_ops msg_ops; static struct proto tipc_proto; static int sockets_enabled = 0; static atomic_t tipc_queue_size = ATOMIC_INIT(0); /* * sock_lock(): Lock a port/socket pair. lock_sock() can * not be used here, since the same lock must protect ports * with non-socket interfaces. * See net.c for description of locking policy. */static void sock_lock(struct tipc_sock* tsock){ spin_lock_bh(tsock->p->lock);} /* * sock_unlock(): Unlock a port/socket pair */static void sock_unlock(struct tipc_sock* tsock){ spin_unlock_bh(tsock->p->lock);} /** * pollmask - determine the current set of poll() events for a socket * @sock: socket structure * * TIPC sets the returned events as follows: * a) POLLRDNORM and POLLIN are set if the socket's receive queue is non-empty * or if a connection-oriented socket is does not have an active connection * (i.e. a read operation will not block). * b) POLLOUT is set except when a socket's connection has been terminated * (i.e. a write operation will not block). * c) POLLHUP is set when a socket's connection has been terminated. * * IMPORTANT: The fact that a read or write operation will not block does NOT * imply that the operation will succeed! * * Returns pollmask value */ static u32 pollmask(struct socket *sock){ u32 mask; if ((skb_queue_len(&sock->sk->sk_receive_queue) != 0) || (sock->state == SS_UNCONNECTED) || (sock->state == SS_DISCONNECTING)) mask = (POLLRDNORM | POLLIN); else mask = 0; if (sock->state == SS_DISCONNECTING) mask |= POLLHUP; else mask |= POLLOUT; return mask;} /** * advance_queue - discard first buffer in queue * @tsock: TIPC socket */ static void advance_queue(struct tipc_sock *tsock){ sock_lock(tsock); buf_discard(skb_dequeue(&tsock->sk.sk_receive_queue)); sock_unlock(tsock); atomic_dec(&tipc_queue_size);} /** * tipc_create - create a TIPC socket * @sock: pre-allocated socket structure * @protocol: protocol indicator (must be 0) * * This routine creates and attaches a 'struct sock' to the 'struct socket', * then create and attaches a TIPC port to the 'struct sock' part. * * Returns 0 on success, errno otherwise */static int tipc_create(struct socket *sock, int protocol){ struct tipc_sock *tsock; struct tipc_port *port; struct sock *sk; u32 ref; if (unlikely(protocol != 0)) return -EPROTONOSUPPORT; ref = tipc_createport_raw(NULL, &dispatch, &wakeupdispatch, TIPC_LOW_IMPORTANCE); if (unlikely(!ref)) return -ENOMEM; sock->state = SS_UNCONNECTED; switch (sock->type) { case SOCK_STREAM: sock->ops = &stream_ops; break; case SOCK_SEQPACKET: sock->ops = &packet_ops; break; case SOCK_DGRAM: tipc_set_portunreliable(ref, 1); /* fall through */ case SOCK_RDM: tipc_set_portunreturnable(ref, 1); sock->ops = &msg_ops; sock->state = SS_READY; break; default: tipc_deleteport(ref); return -EPROTOTYPE; } sk = sk_alloc(AF_TIPC, GFP_KERNEL, &tipc_proto, 1); if (!sk) { tipc_deleteport(ref); return -ENOMEM; } sock_init_data(sock, sk); init_waitqueue_head(sk->sk_sleep); sk->sk_rcvtimeo = 8 * HZ; /* default connect timeout = 8s */ tsock = tipc_sk(sk); port = tipc_get_port(ref); tsock->p = port; port->usr_handle = tsock; init_MUTEX(&tsock->sem); dbg("sock_create: %x\n",tsock); atomic_inc(&tipc_user_count); return 0;} /** * release - destroy a TIPC socket * @sock: socket to destroy * * This routine cleans up any messages that are still queued on the socket. * For DGRAM and RDM socket types, all queued messages are rejected. * For SEQPACKET and STREAM socket types, the first message is rejected * and any others are discarded. (If the first message on a STREAM socket * is partially-read, it is discarded and the next one is rejected instead.) * * NOTE: Rejected messages are not necessarily returned to the sender! They * are returned or discarded according to the "destination droppable" setting * specified for the message by the sender. * * Returns 0 on success, errno otherwise */ static int release(struct socket *sock){ struct tipc_sock *tsock = tipc_sk(sock->sk); struct sock *sk = sock->sk; int res = TIPC_OK; struct sk_buff *buf; dbg("sock_delete: %x\n",tsock); if (!tsock) return 0; down_interruptible(&tsock->sem); if (!sock->sk) { up(&tsock->sem); return 0; } /* Reject unreceived messages, unless no longer connected */ while (sock->state != SS_DISCONNECTING) { sock_lock(tsock); buf = skb_dequeue(&sk->sk_receive_queue); if (!buf) tsock->p->usr_handle = NULL; sock_unlock(tsock); if (!buf) break; if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) buf_discard(buf); else tipc_reject_msg(buf, TIPC_ERR_NO_PORT); atomic_dec(&tipc_queue_size); } /* Delete TIPC port */ res = tipc_deleteport(tsock->p->ref); sock->sk = NULL; /* Discard any remaining messages */ while ((buf = skb_dequeue(&sk->sk_receive_queue))) { buf_discard(buf); atomic_dec(&tipc_queue_size); } up(&tsock->sem); sock_put(sk); atomic_dec(&tipc_user_count); return res;} /** * bind - associate or disassocate TIPC name(s) with a socket * @sock: socket structure * @uaddr: socket address describing name(s) and desired operation * @uaddr_len: size of socket address data structure * * Name and name sequence binding is indicated using a positive scope value; * a negative scope value unbinds the specified name. Specifying no name * (i.e. a socket address length of 0) unbinds all names from the socket. * * Returns 0 on success, errno otherwise */ static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len){ struct tipc_sock *tsock = tipc_sk(sock->sk); struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; int res; if (down_interruptible(&tsock->sem)) return -ERESTARTSYS; if (unlikely(!uaddr_len)) { res = tipc_withdraw(tsock->p->ref, 0, NULL); goto exit; } if (uaddr_len < sizeof(struct sockaddr_tipc)) { res = -EINVAL; goto exit; } if (addr->family != AF_TIPC) { res = -EAFNOSUPPORT; goto exit; } if (addr->addrtype == TIPC_ADDR_NAME) addr->addr.nameseq.upper = addr->addr.nameseq.lower; else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { res = -EAFNOSUPPORT; goto exit; } if (addr->scope > 0) res = tipc_publish(tsock->p->ref, addr->scope, &addr->addr.nameseq); else res = tipc_withdraw(tsock->p->ref, -addr->scope, &addr->addr.nameseq);exit: up(&tsock->sem); return res;} /** * get_name - get port ID of socket or peer socket * @sock: socket structure * @uaddr: area for returned socket address * @uaddr_len: area for returned length of socket address * @peer: 0 to obtain socket name, 1 to obtain peer socket name * * Returns 0 on success, errno otherwise */ static int get_name(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer){ struct tipc_sock *tsock = tipc_sk(sock->sk); struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; u32 res; if (down_interruptible(&tsock->sem)) return -ERESTARTSYS; *uaddr_len = sizeof(*addr); addr->addrtype = TIPC_ADDR_ID; addr->family = AF_TIPC; addr->scope = 0; if (peer) res = tipc_peer(tsock->p->ref, &addr->addr.id); else res = tipc_ownidentity(tsock->p->ref, &addr->addr.id); addr->addr.name.domain = 0; up(&tsock->sem); return res;} /** * poll - read and possibly block on pollmask * @file: file structure associated with the socket * @sock: socket for which to calculate the poll bits * @wait: ??? * * Returns the pollmask */ static unsigned int poll(struct file *file, struct socket *sock, poll_table *wait){ poll_wait(file, sock->sk->sk_sleep, wait); /* NEED LOCK HERE? */ return pollmask(sock);} /** * dest_name_check - verify user is permitted to send to specified port name * @dest: destination address * @m: descriptor for message to be sent * * Prevents restricted configuration commands from being issued by * unauthorized users. * * Returns 0 if permission is granted, otherwise errno */ static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m){ struct tipc_cfg_msg_hdr hdr; if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) return 0; if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) return 0; if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) return -EACCES; if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) return -EFAULT; if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) return -EACCES; return 0;} /** * send_msg - send message in connectionless manner * @iocb: (unused) * @sock: socket structure * @m: message to send * @total_len: length of message * * Message must have an destination specified explicitly. * Used for SOCK_RDM and SOCK_DGRAM messages, * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. * (Note: 'SYN+' is prohibited on SOCK_STREAM.) * * Returns the number of bytes sent on success, or errno otherwise */ static int send_msg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t total_len){ struct tipc_sock *tsock = tipc_sk(sock->sk); struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; struct sk_buff *buf; int needs_conn; int res = -EINVAL; if (unlikely(!dest)) return -EDESTADDRREQ; if (unlikely((m->msg_namelen < sizeof(*dest)) || (dest->family != AF_TIPC))) return -EINVAL; needs_conn = (sock->state != SS_READY); if (unlikely(needs_conn)) { if (sock->state == SS_LISTENING) return -EPIPE; if (sock->state != SS_UNCONNECTED) return -EISCONN; if ((tsock->p->published) || ((sock->type == SOCK_STREAM) && (total_len != 0))) return -EOPNOTSUPP; if (dest->addrtype == TIPC_ADDR_NAME) { tsock->p->conn_type = dest->addr.name.name.type; tsock->p->conn_instance = dest->addr.name.name.instance; } } if (down_interruptible(&tsock->sem)) return -ERESTARTSYS; if (needs_conn) { /* Abort any pending connection attempts (very unlikely) */ while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) { tipc_reject_msg(buf, TIPC_ERR_NO_PORT); atomic_dec(&tipc_queue_size); } sock->state = SS_CONNECTING; } do { if (dest->addrtype == TIPC_ADDR_NAME) { if ((res = dest_name_check(dest, m))) goto exit; res = tipc_send2name(tsock->p->ref, &dest->addr.name.name, dest->addr.name.domain, m->msg_iovlen, m->msg_iov);Lines 1–500 of 1747. 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/* * net/tipc/socket.c: TIPC socket API * * Copyright (c) 2001-2006, Ericsson AB * Copyright (c) 2004-2006, Wind River Systems * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the names of the copyright holders nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include <linux/module.h> #include <linux/types.h> #include <linux/net.h> #include <linux/socket.h> #include <linux/errno.h> #include <linux/mm.h> #include <linux/slab.h> #include <linux/poll.h> #include <linux/fcntl.h> #include <asm/semaphore.h> #include <asm/string.h> #include <asm/atomic.h> #include <net/sock.h> #include <linux/tipc.h> #include <linux/tipc_config.h> #include <net/tipc/tipc_msg.h> #include <net/tipc/tipc_port.h> #include "core.h" #define SS_LISTENING -1 /* socket is listening */ #define SS_READY -2 /* socket is connectionless */ #define OVERLOAD_LIMIT_BASE 5000 struct tipc_sock { struct sock sk; struct tipc_port *p; struct semaphore sem; }; #define tipc_sk(sk) ((struct tipc_sock*)sk) static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf); static void wakeupdispatch(struct tipc_port *tport); static struct proto_ops packet_ops; static struct proto_ops stream_ops; static struct proto_ops msg_ops; static struct proto tipc_proto; static int sockets_enabled = 0; static atomic_t tipc_queue_size = ATOMIC_INIT(0); /* * sock_lock(): Lock a port/socket pair. lock_sock() can * not be used here, since the same lock must protect ports * with non-socket interfaces. * See net.c for description of locking policy. */ static void sock_lock(struct tipc_sock* tsock) { spin_lock_bh(tsock->p->lock); } /* * sock_unlock(): Unlock a port/socket pair */ static void sock_unlock(struct tipc_sock* tsock) { spin_unlock_bh(tsock->p->lock); } /** * pollmask - determine the current set of poll() events for a socket * @sock: socket structure * * TIPC sets the returned events as follows: * a) POLLRDNORM and POLLIN are set if the socket's receive queue is non-empty * or if a connection-oriented socket is does not have an active connection * (i.e. a read operation will not block). * b) POLLOUT is set except when a socket's connection has been terminated * (i.e. a write operation will not block). * c) POLLHUP is set when a socket's connection has been terminated. * * IMPORTANT: The fact that a read or write operation will not block does NOT * imply that the operation will succeed! * * Returns pollmask value */ static u32 pollmask(struct socket *sock) { u32 mask; if ((skb_queue_len(&sock->sk->sk_receive_queue) != 0) || (sock->state == SS_UNCONNECTED) || (sock->state == SS_DISCONNECTING)) mask = (POLLRDNORM | POLLIN); else mask = 0; if (sock->state == SS_DISCONNECTING) mask |= POLLHUP; else mask |= POLLOUT; return mask; } /** * advance_queue - discard first buffer in queue * @tsock: TIPC socket */ static void advance_queue(struct tipc_sock *tsock) { sock_lock(tsock); buf_discard(skb_dequeue(&tsock->sk.sk_receive_queue)); sock_unlock(tsock); atomic_dec(&tipc_queue_size); } /** * tipc_create - create a TIPC socket * @sock: pre-allocated socket structure * @protocol: protocol indicator (must be 0) * * This routine creates and attaches a 'struct sock' to the 'struct socket', * then create and attaches a TIPC port to the 'struct sock' part. * * Returns 0 on success, errno otherwise */ static int tipc_create(struct socket *sock, int protocol) { struct tipc_sock *tsock; struct tipc_port *port; struct sock *sk; u32 ref; if (unlikely(protocol != 0)) return -EPROTONOSUPPORT; ref = tipc_createport_raw(NULL, &dispatch, &wakeupdispatch, TIPC_LOW_IMPORTANCE); if (unlikely(!ref)) return -ENOMEM; sock->state = SS_UNCONNECTED; switch (sock->type) { case SOCK_STREAM: sock->ops = &stream_ops; break; case SOCK_SEQPACKET: sock->ops = &packet_ops; break; case SOCK_DGRAM: tipc_set_portunreliable(ref, 1); /* fall through */ case SOCK_RDM: tipc_set_portunreturnable(ref, 1); sock->ops = &msg_ops; sock->state = SS_READY; break; default: tipc_deleteport(ref); return -EPROTOTYPE; } sk = sk_alloc(AF_TIPC, GFP_KERNEL, &tipc_proto, 1); if (!sk) { tipc_deleteport(ref); return -ENOMEM; } sock_init_data(sock, sk); init_waitqueue_head(sk->sk_sleep); sk->sk_rcvtimeo = 8 * HZ; /* default connect timeout = 8s */ tsock = tipc_sk(sk); port = tipc_get_port(ref); tsock->p = port; port->usr_handle = tsock; init_MUTEX(&tsock->sem); dbg("sock_create: %x\n",tsock); atomic_inc(&tipc_user_count); return 0; } /** * release - destroy a TIPC socket * @sock: socket to destroy * * This routine cleans up any messages that are still queued on the socket. * For DGRAM and RDM socket types, all queued messages are rejected. * For SEQPACKET and STREAM socket types, the first message is rejected * and any others are discarded. (If the first message on a STREAM socket * is partially-read, it is discarded and the next one is rejected instead.) * * NOTE: Rejected messages are not necessarily returned to the sender! They * are returned or discarded according to the "destination droppable" setting * specified for the message by the sender. * * Returns 0 on success, errno otherwise */ static int release(struct socket *sock) { struct tipc_sock *tsock = tipc_sk(sock->sk); struct sock *sk = sock->sk; int res = TIPC_OK; struct sk_buff *buf; dbg("sock_delete: %x\n",tsock); if (!tsock) return 0; down_interruptible(&tsock->sem); if (!sock->sk) { up(&tsock->sem); return 0; } /* Reject unreceived messages, unless no longer connected */ while (sock->state != SS_DISCONNECTING) { sock_lock(tsock); buf = skb_dequeue(&sk->sk_receive_queue); if (!buf) tsock->p->usr_handle = NULL; sock_unlock(tsock); if (!buf) break; if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) buf_discard(buf); else tipc_reject_msg(buf, TIPC_ERR_NO_PORT); atomic_dec(&tipc_queue_size); } /* Delete TIPC port */ res = tipc_deleteport(tsock->p->ref); sock->sk = NULL; /* Discard any remaining messages */ while ((buf = skb_dequeue(&sk->sk_receive_queue))) { buf_discard(buf); atomic_dec(&tipc_queue_size); } up(&tsock->sem); sock_put(sk); atomic_dec(&tipc_user_count); return res; } /** * bind - associate or disassocate TIPC name(s) with a socket * @sock: socket structure * @uaddr: socket address describing name(s) and desired operation * @uaddr_len: size of socket address data structure * * Name and name sequence binding is indicated using a positive scope value; * a negative scope value unbinds the specified name. Specifying no name * (i.e. a socket address length of 0) unbinds all names from the socket. * * Returns 0 on success, errno otherwise */ static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len) { struct tipc_sock *tsock = tipc_sk(sock->sk); struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; int res; if (down_interruptible(&tsock->sem)) return -ERESTARTSYS; if (unlikely(!uaddr_len)) { res = tipc_withdraw(tsock->p->ref, 0, NULL); goto exit; } if (uaddr_len < sizeof(struct sockaddr_tipc)) { res = -EINVAL; goto exit; } if (addr->family != AF_TIPC) { res = -EAFNOSUPPORT; goto exit; } if (addr->addrtype == TIPC_ADDR_NAME) addr->addr.nameseq.upper = addr->addr.nameseq.lower; else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { res = -EAFNOSUPPORT; goto exit; } if (addr->scope > 0) res = tipc_publish(tsock->p->ref, addr->scope, &addr->addr.nameseq); else res = tipc_withdraw(tsock->p->ref, -addr->scope, &addr->addr.nameseq); exit: up(&tsock->sem); return res; } /** * get_name - get port ID of socket or peer socket * @sock: socket structure * @uaddr: area for returned socket address * @uaddr_len: area for returned length of socket address * @peer: 0 to obtain socket name, 1 to obtain peer socket name * * Returns 0 on success, errno otherwise */ static int get_name(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer) { struct tipc_sock *tsock = tipc_sk(sock->sk); struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; u32 res; if (down_interruptible(&tsock->sem)) return -ERESTARTSYS; *uaddr_len = sizeof(*addr); addr->addrtype = TIPC_ADDR_ID; addr->family = AF_TIPC; addr->scope = 0; if (peer) res = tipc_peer(tsock->p->ref, &addr->addr.id); else res = tipc_ownidentity(tsock->p->ref, &addr->addr.id); addr->addr.name.domain = 0; up(&tsock->sem); return res; } /** * poll - read and possibly block on pollmask * @file: file structure associated with the socket * @sock: socket for which to calculate the poll bits * @wait: ??? * * Returns the pollmask */ static unsigned int poll(struct file *file, struct socket *sock, poll_table *wait) { poll_wait(file, sock->sk->sk_sleep, wait); /* NEED LOCK HERE? */ return pollmask(sock); } /** * dest_name_check - verify user is permitted to send to specified port name * @dest: destination address * @m: descriptor for message to be sent * * Prevents restricted configuration commands from being issued by * unauthorized users. * * Returns 0 if permission is granted, otherwise errno */ static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) { struct tipc_cfg_msg_hdr hdr; if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) return 0; if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) return 0; if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) return -EACCES; if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) return -EFAULT; if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) return -EACCES; return 0; } /** * send_msg - send message in connectionless manner * @iocb: (unused) * @sock: socket structure * @m: message to send * @total_len: length of message * * Message must have an destination specified explicitly. * Used for SOCK_RDM and SOCK_DGRAM messages, * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. * (Note: 'SYN+' is prohibited on SOCK_STREAM.) * * Returns the number of bytes sent on success, or errno otherwise */ static int send_msg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t total_len) { struct tipc_sock *tsock = tipc_sk(sock->sk); struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; struct sk_buff *buf; int needs_conn; int res = -EINVAL; if (unlikely(!dest)) return -EDESTADDRREQ; if (unlikely((m->msg_namelen < sizeof(*dest)) || (dest->family != AF_TIPC))) return -EINVAL; needs_conn = (sock->state != SS_READY); if (unlikely(needs_conn)) { if (sock->state == SS_LISTENING) return -EPIPE; if (sock->state != SS_UNCONNECTED) return -EISCONN; if ((tsock->p->published) || ((sock->type == SOCK_STREAM) && (total_len != 0))) return -EOPNOTSUPP; if (dest->addrtype == TIPC_ADDR_NAME) { tsock->p->conn_type = dest->addr.name.name.type; tsock->p->conn_instance = dest->addr.name.name.instance; } } if (down_interruptible(&tsock->sem)) return -ERESTARTSYS; if (needs_conn) { /* Abort any pending connection attempts (very unlikely) */ while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) { tipc_reject_msg(buf, TIPC_ERR_NO_PORT); atomic_dec(&tipc_queue_size); } sock->state = SS_CONNECTING; } do { if (dest->addrtype == TIPC_ADDR_NAME) { if ((res = dest_name_check(dest, m))) goto exit; res = tipc_send2name(tsock->p->ref, &dest->addr.name.name, dest->addr.name.domain, m->msg_iovlen, m->msg_iov);