| /* |
| * net/tipc/socket.c: TIPC socket API |
| * |
| * Copyright (c) 2001-2007, 2012 Ericsson AB |
| * Copyright (c) 2004-2008, 2010-2013, 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 "core.h" |
| #include "port.h" |
| |
| #include <linux/export.h> |
| #include <net/sock.h> |
| |
| #define SS_LISTENING -1 /* socket is listening */ |
| #define SS_READY -2 /* socket is connectionless */ |
| |
| #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ |
| |
| struct tipc_sock { |
| struct sock sk; |
| struct tipc_port *p; |
| struct tipc_portid peer_name; |
| unsigned int conn_timeout; |
| }; |
| |
| #define tipc_sk(sk) ((struct tipc_sock *)(sk)) |
| #define tipc_sk_port(sk) (tipc_sk(sk)->p) |
| |
| static int backlog_rcv(struct sock *sk, struct sk_buff *skb); |
| static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf); |
| static void wakeupdispatch(struct tipc_port *tport); |
| static void tipc_data_ready(struct sock *sk, int len); |
| static void tipc_write_space(struct sock *sk); |
| static int release(struct socket *sock); |
| static int accept(struct socket *sock, struct socket *new_sock, int flags); |
| |
| static const struct proto_ops packet_ops; |
| static const struct proto_ops stream_ops; |
| static const struct proto_ops msg_ops; |
| |
| static struct proto tipc_proto; |
| static struct proto tipc_proto_kern; |
| |
| /* |
| * Revised TIPC socket locking policy: |
| * |
| * Most socket operations take the standard socket lock when they start |
| * and hold it until they finish (or until they need to sleep). Acquiring |
| * this lock grants the owner exclusive access to the fields of the socket |
| * data structures, with the exception of the backlog queue. A few socket |
| * operations can be done without taking the socket lock because they only |
| * read socket information that never changes during the life of the socket. |
| * |
| * Socket operations may acquire the lock for the associated TIPC port if they |
| * need to perform an operation on the port. If any routine needs to acquire |
| * both the socket lock and the port lock it must take the socket lock first |
| * to avoid the risk of deadlock. |
| * |
| * The dispatcher handling incoming messages cannot grab the socket lock in |
| * the standard fashion, since invoked it runs at the BH level and cannot block. |
| * Instead, it checks to see if the socket lock is currently owned by someone, |
| * and either handles the message itself or adds it to the socket's backlog |
| * queue; in the latter case the queued message is processed once the process |
| * owning the socket lock releases it. |
| * |
| * NOTE: Releasing the socket lock while an operation is sleeping overcomes |
| * the problem of a blocked socket operation preventing any other operations |
| * from occurring. However, applications must be careful if they have |
| * multiple threads trying to send (or receive) on the same socket, as these |
| * operations might interfere with each other. For example, doing a connect |
| * and a receive at the same time might allow the receive to consume the |
| * ACK message meant for the connect. While additional work could be done |
| * to try and overcome this, it doesn't seem to be worthwhile at the present. |
| * |
| * NOTE: Releasing the socket lock while an operation is sleeping also ensures |
| * that another operation that must be performed in a non-blocking manner is |
| * not delayed for very long because the lock has already been taken. |
| * |
| * NOTE: This code assumes that certain fields of a port/socket pair are |
| * constant over its lifetime; such fields can be examined without taking |
| * the socket lock and/or port lock, and do not need to be re-read even |
| * after resuming processing after waiting. These fields include: |
| * - socket type |
| * - pointer to socket sk structure (aka tipc_sock structure) |
| * - pointer to port structure |
| * - port reference |
| */ |
| |
| /** |
| * advance_rx_queue - discard first buffer in socket receive queue |
| * |
| * Caller must hold socket lock |
| */ |
| static void advance_rx_queue(struct sock *sk) |
| { |
| kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); |
| } |
| |
| /** |
| * reject_rx_queue - reject all buffers in socket receive queue |
| * |
| * Caller must hold socket lock |
| */ |
| static void reject_rx_queue(struct sock *sk) |
| { |
| struct sk_buff *buf; |
| |
| while ((buf = __skb_dequeue(&sk->sk_receive_queue))) |
| tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
| } |
| |
| /** |
| * tipc_sk_create - create a TIPC socket |
| * @net: network namespace (must be default network) |
| * @sock: pre-allocated socket structure |
| * @protocol: protocol indicator (must be 0) |
| * @kern: caused by kernel or by userspace? |
| * |
| * This routine creates additional data structures used by the TIPC socket, |
| * initializes them, and links them together. |
| * |
| * Returns 0 on success, errno otherwise |
| */ |
| static int tipc_sk_create(struct net *net, struct socket *sock, int protocol, |
| int kern) |
| { |
| const struct proto_ops *ops; |
| socket_state state; |
| struct sock *sk; |
| struct tipc_port *tp_ptr; |
| |
| /* Validate arguments */ |
| if (unlikely(protocol != 0)) |
| return -EPROTONOSUPPORT; |
| |
| switch (sock->type) { |
| case SOCK_STREAM: |
| ops = &stream_ops; |
| state = SS_UNCONNECTED; |
| break; |
| case SOCK_SEQPACKET: |
| ops = &packet_ops; |
| state = SS_UNCONNECTED; |
| break; |
| case SOCK_DGRAM: |
| case SOCK_RDM: |
| ops = &msg_ops; |
| state = SS_READY; |
| break; |
| default: |
| return -EPROTOTYPE; |
| } |
| |
| /* Allocate socket's protocol area */ |
| if (!kern) |
| sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); |
| else |
| sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern); |
| |
| if (sk == NULL) |
| return -ENOMEM; |
| |
| /* Allocate TIPC port for socket to use */ |
| tp_ptr = tipc_createport(sk, &dispatch, &wakeupdispatch, |
| TIPC_LOW_IMPORTANCE); |
| if (unlikely(!tp_ptr)) { |
| sk_free(sk); |
| return -ENOMEM; |
| } |
| |
| /* Finish initializing socket data structures */ |
| sock->ops = ops; |
| sock->state = state; |
| |
| sock_init_data(sock, sk); |
| sk->sk_backlog_rcv = backlog_rcv; |
| sk->sk_rcvbuf = sysctl_tipc_rmem[1]; |
| sk->sk_data_ready = tipc_data_ready; |
| sk->sk_write_space = tipc_write_space; |
| tipc_sk(sk)->p = tp_ptr; |
| tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT; |
| |
| spin_unlock_bh(tp_ptr->lock); |
| |
| if (sock->state == SS_READY) { |
| tipc_set_portunreturnable(tp_ptr->ref, 1); |
| if (sock->type == SOCK_DGRAM) |
| tipc_set_portunreliable(tp_ptr->ref, 1); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * tipc_sock_create_local - create TIPC socket from inside TIPC module |
| * @type: socket type - SOCK_RDM or SOCK_SEQPACKET |
| * |
| * We cannot use sock_creat_kern here because it bumps module user count. |
| * Since socket owner and creator is the same module we must make sure |
| * that module count remains zero for module local sockets, otherwise |
| * we cannot do rmmod. |
| * |
| * Returns 0 on success, errno otherwise |
| */ |
| int tipc_sock_create_local(int type, struct socket **res) |
| { |
| int rc; |
| |
| rc = sock_create_lite(AF_TIPC, type, 0, res); |
| if (rc < 0) { |
| pr_err("Failed to create kernel socket\n"); |
| return rc; |
| } |
| tipc_sk_create(&init_net, *res, 0, 1); |
| |
| return 0; |
| } |
| |
| /** |
| * tipc_sock_release_local - release socket created by tipc_sock_create_local |
| * @sock: the socket to be released. |
| * |
| * Module reference count is not incremented when such sockets are created, |
| * so we must keep it from being decremented when they are released. |
| */ |
| void tipc_sock_release_local(struct socket *sock) |
| { |
| release(sock); |
| sock->ops = NULL; |
| sock_release(sock); |
| } |
| |
| /** |
| * tipc_sock_accept_local - accept a connection on a socket created |
| * with tipc_sock_create_local. Use this function to avoid that |
| * module reference count is inadvertently incremented. |
| * |
| * @sock: the accepting socket |
| * @newsock: reference to the new socket to be created |
| * @flags: socket flags |
| */ |
| |
| int tipc_sock_accept_local(struct socket *sock, struct socket **newsock, |
| int flags) |
| { |
| struct sock *sk = sock->sk; |
| int ret; |
| |
| ret = sock_create_lite(sk->sk_family, sk->sk_type, |
| sk->sk_protocol, newsock); |
| if (ret < 0) |
| return ret; |
| |
| ret = accept(sock, *newsock, flags); |
| if (ret < 0) { |
| sock_release(*newsock); |
| return ret; |
| } |
| (*newsock)->ops = sock->ops; |
| return ret; |
| } |
| |
| /** |
| * 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 sock *sk = sock->sk; |
| struct tipc_port *tport; |
| struct sk_buff *buf; |
| int res; |
| |
| /* |
| * Exit if socket isn't fully initialized (occurs when a failed accept() |
| * releases a pre-allocated child socket that was never used) |
| */ |
| if (sk == NULL) |
| return 0; |
| |
| tport = tipc_sk_port(sk); |
| lock_sock(sk); |
| |
| /* |
| * Reject all unreceived messages, except on an active connection |
| * (which disconnects locally & sends a 'FIN+' to peer) |
| */ |
| while (sock->state != SS_DISCONNECTING) { |
| buf = __skb_dequeue(&sk->sk_receive_queue); |
| if (buf == NULL) |
| break; |
| if (TIPC_SKB_CB(buf)->handle != NULL) |
| kfree_skb(buf); |
| else { |
| if ((sock->state == SS_CONNECTING) || |
| (sock->state == SS_CONNECTED)) { |
| sock->state = SS_DISCONNECTING; |
| tipc_disconnect(tport->ref); |
| } |
| tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
| } |
| } |
| |
| /* |
| * Delete TIPC port; this ensures no more messages are queued |
| * (also disconnects an active connection & sends a 'FIN-' to peer) |
| */ |
| res = tipc_deleteport(tport); |
| |
| /* Discard any remaining (connection-based) messages in receive queue */ |
| __skb_queue_purge(&sk->sk_receive_queue); |
| |
| /* Reject any messages that accumulated in backlog queue */ |
| sock->state = SS_DISCONNECTING; |
| release_sock(sk); |
| |
| sock_put(sk); |
| sock->sk = NULL; |
| |
| 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 |
| * |
| * NOTE: This routine doesn't need to take the socket lock since it doesn't |
| * access any non-constant socket information. |
| */ |
| static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len) |
| { |
| struct sock *sk = sock->sk; |
| struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
| struct tipc_port *tport = tipc_sk_port(sock->sk); |
| int res = -EINVAL; |
| |
| lock_sock(sk); |
| if (unlikely(!uaddr_len)) { |
| res = tipc_withdraw(tport, 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->addr.nameseq.type < TIPC_RESERVED_TYPES) && |
| (addr->addr.nameseq.type != TIPC_TOP_SRV) && |
| (addr->addr.nameseq.type != TIPC_CFG_SRV)) { |
| res = -EACCES; |
| goto exit; |
| } |
| |
| res = (addr->scope > 0) ? |
| tipc_publish(tport, addr->scope, &addr->addr.nameseq) : |
| tipc_withdraw(tport, -addr->scope, &addr->addr.nameseq); |
| exit: |
| release_sock(sk); |
| 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 = own ID, 1 = current peer ID, 2 = current/former peer ID |
| * |
| * Returns 0 on success, errno otherwise |
| * |
| * NOTE: This routine doesn't need to take the socket lock since it only |
| * accesses socket information that is unchanging (or which changes in |
| * a completely predictable manner). |
| */ |
| static int get_name(struct socket *sock, struct sockaddr *uaddr, |
| int *uaddr_len, int peer) |
| { |
| struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
| struct tipc_sock *tsock = tipc_sk(sock->sk); |
| |
| memset(addr, 0, sizeof(*addr)); |
| if (peer) { |
| if ((sock->state != SS_CONNECTED) && |
| ((peer != 2) || (sock->state != SS_DISCONNECTING))) |
| return -ENOTCONN; |
| addr->addr.id.ref = tsock->peer_name.ref; |
| addr->addr.id.node = tsock->peer_name.node; |
| } else { |
| addr->addr.id.ref = tsock->p->ref; |
| addr->addr.id.node = tipc_own_addr; |
| } |
| |
| *uaddr_len = sizeof(*addr); |
| addr->addrtype = TIPC_ADDR_ID; |
| addr->family = AF_TIPC; |
| addr->scope = 0; |
| addr->addr.name.domain = 0; |
| |
| return 0; |
| } |
| |
| /** |
| * 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 pollmask value |
| * |
| * COMMENTARY: |
| * It appears that the usual socket locking mechanisms are not useful here |
| * since the pollmask info is potentially out-of-date the moment this routine |
| * exits. TCP and other protocols seem to rely on higher level poll routines |
| * to handle any preventable race conditions, so TIPC will do the same ... |
| * |
| * TIPC sets the returned events as follows: |
| * |
| * socket state flags set |
| * ------------ --------- |
| * unconnected no read flags |
| * POLLOUT if port is not congested |
| * |
| * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue |
| * no write flags |
| * |
| * connected POLLIN/POLLRDNORM if data in rx queue |
| * POLLOUT if port is not congested |
| * |
| * disconnecting POLLIN/POLLRDNORM/POLLHUP |
| * no write flags |
| * |
| * listening POLLIN if SYN in rx queue |
| * no write flags |
| * |
| * ready POLLIN/POLLRDNORM if data in rx queue |
| * [connectionless] POLLOUT (since port cannot be congested) |
| * |
| * IMPORTANT: The fact that a read or write operation is indicated does NOT |
| * imply that the operation will succeed, merely that it should be performed |
| * and will not block. |
| */ |
| static unsigned int poll(struct file *file, struct socket *sock, |
| poll_table *wait) |
| { |
| struct sock *sk = sock->sk; |
| u32 mask = 0; |
| |
| sock_poll_wait(file, sk_sleep(sk), wait); |
| |
| switch ((int)sock->state) { |
| case SS_UNCONNECTED: |
| if (!tipc_sk_port(sk)->congested) |
| mask |= POLLOUT; |
| break; |
| case SS_READY: |
| case SS_CONNECTED: |
| if (!tipc_sk_port(sk)->congested) |
| mask |= POLLOUT; |
| /* fall thru' */ |
| case SS_CONNECTING: |
| case SS_LISTENING: |
| if (!skb_queue_empty(&sk->sk_receive_queue)) |
| mask |= (POLLIN | POLLRDNORM); |
| break; |
| case SS_DISCONNECTING: |
| mask = (POLLIN | POLLRDNORM | POLLHUP); |
| break; |
| } |
| |
| return mask; |
| } |
| |
| /** |
| * 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 (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr))) |
| return -EMSGSIZE; |
| 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; |
| } |
| |
| static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p) |
| { |
| struct sock *sk = sock->sk; |
| struct tipc_port *tport = tipc_sk_port(sk); |
| DEFINE_WAIT(wait); |
| int done; |
| |
| do { |
| int err = sock_error(sk); |
| if (err) |
| return err; |
| if (sock->state == SS_DISCONNECTING) |
| return -EPIPE; |
| if (!*timeo_p) |
| return -EAGAIN; |
| if (signal_pending(current)) |
| return sock_intr_errno(*timeo_p); |
| |
| prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
| done = sk_wait_event(sk, timeo_p, !tport->congested); |
| finish_wait(sk_sleep(sk), &wait); |
| } while (!done); |
| return 0; |
| } |
| |
| /** |
| * send_msg - send message in connectionless manner |
| * @iocb: if NULL, indicates that socket lock is already held |
| * @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 sock *sk = sock->sk; |
| struct tipc_port *tport = tipc_sk_port(sk); |
| DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
| int needs_conn; |
| long timeo; |
| int res = -EINVAL; |
| |
| if (unlikely(!dest)) |
| return -EDESTADDRREQ; |
| if (unlikely((m->msg_namelen < sizeof(*dest)) || |
| (dest->family != AF_TIPC))) |
| return -EINVAL; |
| if (total_len > TIPC_MAX_USER_MSG_SIZE) |
| return -EMSGSIZE; |
| |
| if (iocb) |
| lock_sock(sk); |
| |
| needs_conn = (sock->state != SS_READY); |
| if (unlikely(needs_conn)) { |
| if (sock->state == SS_LISTENING) { |
| res = -EPIPE; |
| goto exit; |
| } |
| if (sock->state != SS_UNCONNECTED) { |
| res = -EISCONN; |
| goto exit; |
| } |
| if (tport->published) { |
| res = -EOPNOTSUPP; |
| goto exit; |
| } |
| if (dest->addrtype == TIPC_ADDR_NAME) { |
| tport->conn_type = dest->addr.name.name.type; |
| tport->conn_instance = dest->addr.name.name.instance; |
| } |
| |
| /* Abort any pending connection attempts (very unlikely) */ |
| reject_rx_queue(sk); |
| } |
| |
| timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
| do { |
| if (dest->addrtype == TIPC_ADDR_NAME) { |
| res = dest_name_check(dest, m); |
| if (res) |
| break; |
| res = tipc_send2name(tport->ref, |
| &dest->addr.name.name, |
| dest->addr.name.domain, |
| m->msg_iov, |
| total_len); |
| } else if (dest->addrtype == TIPC_ADDR_ID) { |
| res = tipc_send2port(tport->ref, |
| &dest->addr.id, |
| m->msg_iov, |
| total_len); |
| } else if (dest->addrtype == TIPC_ADDR_MCAST) { |
| if (needs_conn) { |
| res = -EOPNOTSUPP; |
| break; |
| } |
| res = dest_name_check(dest, m); |
| if (res) |
| break; |
| res = tipc_multicast(tport->ref, |
| &dest->addr.nameseq, |
| m->msg_iov, |
| total_len); |
| } |
| if (likely(res != -ELINKCONG)) { |
| if (needs_conn && (res >= 0)) |
| sock->state = SS_CONNECTING; |
| break; |
| } |
| res = tipc_wait_for_sndmsg(sock, &timeo); |
| if (res) |
| break; |
| } while (1); |
| |
| exit: |
| if (iocb) |
| release_sock(sk); |
| return res; |
| } |
| |
| static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p) |
| { |
| struct sock *sk = sock->sk; |
| struct tipc_port *tport = tipc_sk_port(sk); |
| DEFINE_WAIT(wait); |
| int done; |
| |
| do { |
| int err = sock_error(sk); |
| if (err) |
| return err; |
| if (sock->state == SS_DISCONNECTING) |
| return -EPIPE; |
| else if (sock->state != SS_CONNECTED) |
| return -ENOTCONN; |
| if (!*timeo_p) |
| return -EAGAIN; |
| if (signal_pending(current)) |
| return sock_intr_errno(*timeo_p); |
| |
| prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
| done = sk_wait_event(sk, timeo_p, |
| (!tport->congested || !tport->connected)); |
| finish_wait(sk_sleep(sk), &wait); |
| } while (!done); |
| return 0; |
| } |
| |
| /** |
| * send_packet - send a connection-oriented message |
| * @iocb: if NULL, indicates that socket lock is already held |
| * @sock: socket structure |
| * @m: message to send |
| * @total_len: length of message |
| * |
| * Used for SOCK_SEQPACKET messages and SOCK_STREAM data. |
| * |
| * Returns the number of bytes sent on success, or errno otherwise |
| */ |
| static int send_packet(struct kiocb *iocb, struct socket *sock, |
| struct msghdr *m, size_t total_len) |
| { |
| struct sock *sk = sock->sk; |
| struct tipc_port *tport = tipc_sk_port(sk); |
| DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
| int res = -EINVAL; |
| long timeo; |
| |
| /* Handle implied connection establishment */ |
| if (unlikely(dest)) |
| return send_msg(iocb, sock, m, total_len); |
| |
| if (total_len > TIPC_MAX_USER_MSG_SIZE) |
| return -EMSGSIZE; |
| |
| if (iocb) |
| lock_sock(sk); |
| |
| if (unlikely(sock->state != SS_CONNECTED)) { |
| if (sock->state == SS_DISCONNECTING) |
| res = -EPIPE; |
| else |
| res = -ENOTCONN; |
| goto exit; |
| } |
| |
| timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
| do { |
| res = tipc_send(tport->ref, m->msg_iov, total_len); |
| if (likely(res != -ELINKCONG)) |
| break; |
| res = tipc_wait_for_sndpkt(sock, &timeo); |
| if (res) |
| break; |
| } while (1); |
| exit: |
| if (iocb) |
| release_sock(sk); |
| return res; |
| } |
| |
| /** |
| * send_stream - send stream-oriented data |
| * @iocb: (unused) |
| * @sock: socket structure |
| * @m: data to send |
| * @total_len: total length of data to be sent |
| * |
| * Used for SOCK_STREAM data. |
| * |
| * Returns the number of bytes sent on success (or partial success), |
| * or errno if no data sent |
| */ |
| static int send_stream(struct kiocb *iocb, struct socket *sock, |
| struct msghdr *m, size_t total_len) |
| { |
| struct sock *sk = sock->sk; |
| struct tipc_port *tport = tipc_sk_port(sk); |
| struct msghdr my_msg; |
| struct iovec my_iov; |
| struct iovec *curr_iov; |
| int curr_iovlen; |
| char __user *curr_start; |
| u32 hdr_size; |
| int curr_left; |
| int bytes_to_send; |
| int bytes_sent; |
| int res; |
| |
| lock_sock(sk); |
| |
| /* Handle special cases where there is no connection */ |
| if (unlikely(sock->state != SS_CONNECTED)) { |
| if (sock->state == SS_UNCONNECTED) |
| res = send_packet(NULL, sock, m, total_len); |
| else |
| res = sock->state == SS_DISCONNECTING ? -EPIPE : -ENOTCONN; |
| goto exit; |
| } |
| |
| if (unlikely(m->msg_name)) { |
| res = -EISCONN; |
| goto exit; |
| } |
| |
| if (total_len > (unsigned int)INT_MAX) { |
| res = -EMSGSIZE; |
| goto exit; |
| } |
| |
| /* |
| * Send each iovec entry using one or more messages |
| * |
| * Note: This algorithm is good for the most likely case |
| * (i.e. one large iovec entry), but could be improved to pass sets |
| * of small iovec entries into send_packet(). |
| */ |
| curr_iov = m->msg_iov; |
| curr_iovlen = m->msg_iovlen; |
| my_msg.msg_iov = &my_iov; |
| my_msg.msg_iovlen = 1; |
| my_msg.msg_flags = m->msg_flags; |
| my_msg.msg_name = NULL; |
| bytes_sent = 0; |
| |
| hdr_size = msg_hdr_sz(&tport->phdr); |
| |
| while (curr_iovlen--) { |
| curr_start = curr_iov->iov_base; |
| curr_left = curr_iov->iov_len; |
| |
| while (curr_left) { |
| bytes_to_send = tport->max_pkt - hdr_size; |
| if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE) |
| bytes_to_send = TIPC_MAX_USER_MSG_SIZE; |
| if (curr_left < bytes_to_send) |
| bytes_to_send = curr_left; |
| my_iov.iov_base = curr_start; |
| my_iov.iov_len = bytes_to_send; |
| res = send_packet(NULL, sock, &my_msg, bytes_to_send); |
| if (res < 0) { |
| if (bytes_sent) |
| res = bytes_sent; |
| goto exit; |
| } |
| curr_left -= bytes_to_send; |
| curr_start += bytes_to_send; |
| bytes_sent += bytes_to_send; |
| } |
| |
| curr_iov++; |
| } |
| res = bytes_sent; |
| exit: |
| release_sock(sk); |
| return res; |
| } |
| |
| /** |
| * auto_connect - complete connection setup to a remote port |
| * @sock: socket structure |
| * @msg: peer's response message |
| * |
| * Returns 0 on success, errno otherwise |
| */ |
| static int auto_connect(struct socket *sock, struct tipc_msg *msg) |
| { |
| struct tipc_sock *tsock = tipc_sk(sock->sk); |
| struct tipc_port *p_ptr; |
| |
| tsock->peer_name.ref = msg_origport(msg); |
| tsock->peer_name.node = msg_orignode(msg); |
| p_ptr = tipc_port_deref(tsock->p->ref); |
| if (!p_ptr) |
| return -EINVAL; |
| |
| __tipc_connect(tsock->p->ref, p_ptr, &tsock->peer_name); |
| |
| if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE) |
| return -EINVAL; |
| msg_set_importance(&p_ptr->phdr, (u32)msg_importance(msg)); |
| sock->state = SS_CONNECTED; |
| return 0; |
| } |
| |
| /** |
| * set_orig_addr - capture sender's address for received message |
| * @m: descriptor for message info |
| * @msg: received message header |
| * |
| * Note: Address is not captured if not requested by receiver. |
| */ |
| static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
| { |
| DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name); |
| |
| if (addr) { |
| addr->family = AF_TIPC; |
| addr->addrtype = TIPC_ADDR_ID; |
| memset(&addr->addr, 0, sizeof(addr->addr)); |
| addr->addr.id.ref = msg_origport(msg); |
| addr->addr.id.node = msg_orignode(msg); |
| addr->addr.name.domain = 0; /* could leave uninitialized */ |
| addr->scope = 0; /* could leave uninitialized */ |
| m->msg_namelen = sizeof(struct sockaddr_tipc); |
| } |
| } |
| |
| /** |
| * anc_data_recv - optionally capture ancillary data for received message |
| * @m: descriptor for message info |
| * @msg: received message header |
| * @tport: TIPC port associated with message |
| * |
| * Note: Ancillary data is not captured if not requested by receiver. |
| * |
| * Returns 0 if successful, otherwise errno |
| */ |
| static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
| struct tipc_port *tport) |
| { |
| u32 anc_data[3]; |
| u32 err; |
| u32 dest_type; |
| int has_name; |
| int res; |
| |
| if (likely(m->msg_controllen == 0)) |
| return 0; |
| |
| /* Optionally capture errored message object(s) */ |
| err = msg ? msg_errcode(msg) : 0; |
| if (unlikely(err)) { |
| anc_data[0] = err; |
| anc_data[1] = msg_data_sz(msg); |
| res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
| if (res) |
| return res; |
| if (anc_data[1]) { |
| res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], |
| msg_data(msg)); |
| if (res) |
| return res; |
| } |
| } |
| |
| /* Optionally capture message destination object */ |
| dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
| switch (dest_type) { |
| case TIPC_NAMED_MSG: |
| has_name = 1; |
| anc_data[0] = msg_nametype(msg); |
| anc_data[1] = msg_namelower(msg); |
| anc_data[2] = msg_namelower(msg); |
| break; |
| case TIPC_MCAST_MSG: |
| has_name = 1; |
| anc_data[0] = msg_nametype(msg); |
| anc_data[1] = msg_namelower(msg); |
| anc_data[2] = msg_nameupper(msg); |
| break; |
| case TIPC_CONN_MSG: |
| has_name = (tport->conn_type != 0); |
| anc_data[0] = tport->conn_type; |
| anc_data[1] = tport->conn_instance; |
| anc_data[2] = tport->conn_instance; |
| break; |
| default: |
| has_name = 0; |
| } |
| if (has_name) { |
| res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); |
| if (res) |
| return res; |
| } |
| |
| return 0; |
| } |
| |
| static int tipc_wait_for_rcvmsg(struct socket *sock, long timeo) |
| { |
| struct sock *sk = sock->sk; |
| DEFINE_WAIT(wait); |
| int err; |
| |
| for (;;) { |
| prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
| if (skb_queue_empty(&sk->sk_receive_queue)) { |
| if (sock->state == SS_DISCONNECTING) { |
| err = -ENOTCONN; |
| break; |
| } |
| release_sock(sk); |
| timeo = schedule_timeout(timeo); |
| lock_sock(sk); |
| } |
| err = 0; |
| if (!skb_queue_empty(&sk->sk_receive_queue)) |
| break; |
| err = sock_intr_errno(timeo); |
| if (signal_pending(current)) |
| break; |
| err = -EAGAIN; |
| if (!timeo) |
| break; |
| } |
| finish_wait(sk_sleep(sk), &wait); |
| return err; |
| } |
| |
| /** |
| * recv_msg - receive packet-oriented message |
| * @iocb: (unused) |
| * @m: descriptor for message info |
| * @buf_len: total size of user buffer area |
| * @flags: receive flags |
| * |
| * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
| * If the complete message doesn't fit in user area, truncate it. |
| * |
| * Returns size of returned message data, errno otherwise |
| */ |
| static int recv_msg(struct kiocb *iocb, struct socket *sock, |
| struct msghdr *m, size_t buf_len, int flags) |
| { |
| struct sock *sk = sock->sk; |
| struct tipc_port *tport = tipc_sk_port(sk); |
| struct sk_buff *buf; |
| struct tipc_msg *msg; |
| long timeo; |
| unsigned int sz; |
| u32 err; |
| int res; |
| |
| /* Catch invalid receive requests */ |
| if (unlikely(!buf_len)) |
| return -EINVAL; |
| |
| lock_sock(sk); |
| |
| if (unlikely(sock->state == SS_UNCONNECTED)) { |
| res = -ENOTCONN; |
| goto exit; |
| } |
| |
| timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
| restart: |
| |
| /* Look for a message in receive queue; wait if necessary */ |
| res = tipc_wait_for_rcvmsg(sock, timeo); |
| if (res) |
| goto exit; |
| |
| /* Look at first message in receive queue */ |
| buf = skb_peek(&sk->sk_receive_queue); |
| msg = buf_msg(buf); |
| sz = msg_data_sz(msg); |
| err = msg_errcode(msg); |
| |
| /* Discard an empty non-errored message & try again */ |
| if ((!sz) && (!err)) { |
| advance_rx_queue(sk); |
| goto restart; |
| } |
| |
| /* Capture sender's address (optional) */ |
| set_orig_addr(m, msg); |
| |
| /* Capture ancillary data (optional) */ |
| res = anc_data_recv(m, msg, tport); |
| if (res) |
| goto exit; |
| |
| /* Capture message data (if valid) & compute return value (always) */ |
| if (!err) { |
| if (unlikely(buf_len < sz)) { |
| sz = buf_len; |
| m->msg_flags |= MSG_TRUNC; |
| } |
| res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg), |
| m->msg_iov, sz); |
| if (res) |
| goto exit; |
| res = sz; |
| } else { |
| if ((sock->state == SS_READY) || |
| ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) |
| res = 0; |
| else |
| res = -ECONNRESET; |
| } |
| |
| /* Consume received message (optional) */ |
| if (likely(!(flags & MSG_PEEK))) { |
| if ((sock->state != SS_READY) && |
| (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
| tipc_acknowledge(tport->ref, tport->conn_unacked); |
| advance_rx_queue(sk); |
| } |
| exit: |
| release_sock(sk); |
| return res; |
| } |
| |
| /** |
| * recv_stream - receive stream-oriented data |
| * @iocb: (unused) |
| * @m: descriptor for message info |
| * @buf_len: total size of user buffer area |
| * @flags: receive flags |
| * |
| * Used for SOCK_STREAM messages only. If not enough data is available |
| * will optionally wait for more; never truncates data. |
| * |
| * Returns size of returned message data, errno otherwise |
| */ |
| static int recv_stream(struct kiocb *iocb, struct socket *sock, |
| struct msghdr *m, size_t buf_len, int flags) |
| { |
| struct sock *sk = sock->sk; |
| struct tipc_port *tport = tipc_sk_port(sk); |
| struct sk_buff *buf; |
| struct tipc_msg *msg; |
| long timeo; |
| unsigned int sz; |
| int sz_to_copy, target, needed; |
| int sz_copied = 0; |
| u32 err; |
| int res = 0; |
| |
| /* Catch invalid receive attempts */ |
| if (unlikely(!buf_len)) |
| return -EINVAL; |
| |
| lock_sock(sk); |
| |
| if (unlikely(sock->state == SS_UNCONNECTED)) { |
| res = -ENOTCONN; |
| goto exit; |
| } |
| |
| target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
| timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
| |
| restart: |
| /* Look for a message in receive queue; wait if necessary */ |
| res = tipc_wait_for_rcvmsg(sock, timeo); |
| if (res) |
| goto exit; |
| |
| /* Look at first message in receive queue */ |
| buf = skb_peek(&sk->sk_receive_queue); |
| msg = buf_msg(buf); |
| sz = msg_data_sz(msg); |
| err = msg_errcode(msg); |
| |
| /* Discard an empty non-errored message & try again */ |
| if ((!sz) && (!err)) { |
| advance_rx_queue(sk); |
| goto restart; |
| } |
| |
| /* Optionally capture sender's address & ancillary data of first msg */ |
| if (sz_copied == 0) { |
| set_orig_addr(m, msg); |
| res = anc_data_recv(m, msg, tport); |
| if (res) |
| goto exit; |
| } |
| |
| /* Capture message data (if valid) & compute return value (always) */ |
| if (!err) { |
| u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
| |
| sz -= offset; |
| needed = (buf_len - sz_copied); |
| sz_to_copy = (sz <= needed) ? sz : needed; |
| |
| res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset, |
| m->msg_iov, sz_to_copy); |
| if (res) |
| goto exit; |
| |
| sz_copied += sz_to_copy; |
| |
| if (sz_to_copy < sz) { |
| if (!(flags & MSG_PEEK)) |
| TIPC_SKB_CB(buf)->handle = |
| (void *)(unsigned long)(offset + sz_to_copy); |
| goto exit; |
| } |
| } else { |
| if (sz_copied != 0) |
| goto exit; /* can't add error msg to valid data */ |
| |
| if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) |
| res = 0; |
| else |
| res = -ECONNRESET; |
| } |
| |
| /* Consume received message (optional) */ |
| if (likely(!(flags & MSG_PEEK))) { |
| if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
| tipc_acknowledge(tport->ref, tport->conn_unacked); |
| advance_rx_queue(sk); |
| } |
| |
| /* Loop around if more data is required */ |
| if ((sz_copied < buf_len) && /* didn't get all requested data */ |
| (!skb_queue_empty(&sk->sk_receive_queue) || |
| (sz_copied < target)) && /* and more is ready or required */ |
| (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
| (!err)) /* and haven't reached a FIN */ |
| goto restart; |
| |
| exit: |
| release_sock(sk); |
| return sz_copied ? sz_copied : res; |
| } |
| |
| /** |
| * tipc_write_space - wake up thread if port congestion is released |
| * @sk: socket |
| */ |
| static void tipc_write_space(struct sock *sk) |
| { |
| struct socket_wq *wq; |
| |
| rcu_read_lock(); |
| wq = rcu_dereference(sk->sk_wq); |
| if (wq_has_sleeper(wq)) |
| wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | |
| POLLWRNORM | POLLWRBAND); |
| rcu_read_unlock(); |
| } |
| |
| /** |
| * tipc_data_ready - wake up threads to indicate messages have been received |
| * @sk: socket |
| * @len: the length of messages |
| */ |
| static void tipc_data_ready(struct sock *sk, int len) |
| { |
| struct socket_wq *wq; |
| |
| rcu_read_lock(); |
| wq = rcu_dereference(sk->sk_wq); |
| if (wq_has_sleeper(wq)) |
| wake_up_interruptible_sync_poll(&wq->wait, POLLIN | |
| POLLRDNORM | POLLRDBAND); |
| rcu_read_unlock(); |
| } |
| |
| /** |
| * filter_connect - Handle all incoming messages for a connection-based socket |
| * @tsock: TIPC socket |
| * @msg: message |
| * |
| * Returns TIPC error status code and socket error status code |
| * once it encounters some errors |
| */ |
| static u32 filter_connect(struct tipc_sock *tsock, struct sk_buff **buf) |
| { |
| struct socket *sock = tsock->sk.sk_socket; |
| struct tipc_msg *msg = buf_msg(*buf); |
| struct sock *sk = &tsock->sk; |
| u32 retval = TIPC_ERR_NO_PORT; |
| int res; |
| |
| if (msg_mcast(msg)) |
| return retval; |
| |
| switch ((int)sock->state) { |
| case SS_CONNECTED: |
| /* Accept only connection-based messages sent by peer */ |
| if (msg_connected(msg) && tipc_port_peer_msg(tsock->p, msg)) { |
| if (unlikely(msg_errcode(msg))) { |
| sock->state = SS_DISCONNECTING; |
| __tipc_disconnect(tsock->p); |
| } |
| retval = TIPC_OK; |
| } |
| break; |
| case SS_CONNECTING: |
| /* Accept only ACK or NACK message */ |
| if (unlikely(msg_errcode(msg))) { |
| sock->state = SS_DISCONNECTING; |
| sk->sk_err = ECONNREFUSED; |
| retval = TIPC_OK; |
| break; |
| } |
| |
| if (unlikely(!msg_connected(msg))) |
| break; |
| |
| res = auto_connect(sock, msg); |
| if (res) { |
| sock->state = SS_DISCONNECTING; |
| sk->sk_err = -res; |
| retval = TIPC_OK; |
| break; |
| } |
| |
| /* If an incoming message is an 'ACK-', it should be |
| * discarded here because it doesn't contain useful |
| * data. In addition, we should try to wake up |
| * connect() routine if sleeping. |
| */ |
| if (msg_data_sz(msg) == 0) { |
| kfree_skb(*buf); |
| *buf = NULL; |
| if (waitqueue_active(sk_sleep(sk))) |
| wake_up_interruptible(sk_sleep(sk)); |
| } |
| retval = TIPC_OK; |
| break; |
| case SS_LISTENING: |
| case SS_UNCONNECTED: |
| /* Accept only SYN message */ |
| if (!msg_connected(msg) && !(msg_errcode(msg))) |
| retval = TIPC_OK; |
| break; |
| case SS_DISCONNECTING: |
| break; |
| default: |
| pr_err("Unknown socket state %u\n", sock->state); |
| } |
| return retval; |
| } |
| |
| /** |
| * rcvbuf_limit - get proper overload limit of socket receive queue |
| * @sk: socket |
| * @buf: message |
| * |
| * For all connection oriented messages, irrespective of importance, |
| * the default overload value (i.e. 67MB) is set as limit. |
| * |
| * For all connectionless messages, by default new queue limits are |
| * as belows: |
| * |
| * TIPC_LOW_IMPORTANCE (4 MB) |
| * TIPC_MEDIUM_IMPORTANCE (8 MB) |
| * TIPC_HIGH_IMPORTANCE (16 MB) |
| * TIPC_CRITICAL_IMPORTANCE (32 MB) |
| * |
| * Returns overload limit according to corresponding message importance |
| */ |
| static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf) |
| { |
| struct tipc_msg *msg = buf_msg(buf); |
| |
| if (msg_connected(msg)) |
| return sysctl_tipc_rmem[2]; |
| |
| return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE << |
| msg_importance(msg); |
| } |
| |
| /** |
| * filter_rcv - validate incoming message |
| * @sk: socket |
| * @buf: message |
| * |
| * Enqueues message on receive queue if acceptable; optionally handles |
| * disconnect indication for a connected socket. |
| * |
| * Called with socket lock already taken; port lock may also be taken. |
| * |
| * Returns TIPC error status code (TIPC_OK if message is not to be rejected) |
| */ |
| static u32 filter_rcv(struct sock *sk, struct sk_buff *buf) |
| { |
| struct socket *sock = sk->sk_socket; |
| struct tipc_msg *msg = buf_msg(buf); |
| unsigned int limit = rcvbuf_limit(sk, buf); |
| u32 res = TIPC_OK; |
| |
| /* Reject message if it is wrong sort of message for socket */ |
| if (msg_type(msg) > TIPC_DIRECT_MSG) |
| return TIPC_ERR_NO_PORT; |
| |
| if (sock->state == SS_READY) { |
| if (msg_connected(msg)) |
| return TIPC_ERR_NO_PORT; |
| } else { |
| res = filter_connect(tipc_sk(sk), &buf); |
| if (res != TIPC_OK || buf == NULL) |
| return res; |
| } |
| |
| /* Reject message if there isn't room to queue it */ |
| if (sk_rmem_alloc_get(sk) + buf->truesize >= limit) |
| return TIPC_ERR_OVERLOAD; |
| |
| /* Enqueue message */ |
| TIPC_SKB_CB(buf)->handle = NULL; |
| __skb_queue_tail(&sk->sk_receive_queue, buf); |
| skb_set_owner_r(buf, sk); |
| |
| sk->sk_data_ready(sk, 0); |
| return TIPC_OK; |
| } |
| |
| /** |
| * backlog_rcv - handle incoming message from backlog queue |
| * @sk: socket |
| * @buf: message |
| * |
| * Caller must hold socket lock, but not port lock. |
| * |
| * Returns 0 |
| */ |
| static int backlog_rcv(struct sock *sk, struct sk_buff *buf) |
| { |
| u32 res; |
| |
| res = filter_rcv(sk, buf); |
| if (res) |
| tipc_reject_msg(buf, res); |
| return 0; |
| } |
| |
| /** |
| * dispatch - handle incoming message |
| * @tport: TIPC port that received message |
| * @buf: message |
| * |
| * Called with port lock already taken. |
| * |
| * Returns TIPC error status code (TIPC_OK if message is not to be rejected) |
| */ |
| static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf) |
| { |
| struct sock *sk = tport->sk; |
| u32 res; |
| |
| /* |
| * Process message if socket is unlocked; otherwise add to backlog queue |
| * |
| * This code is based on sk_receive_skb(), but must be distinct from it |
| * since a TIPC-specific filter/reject mechanism is utilized |
| */ |
| bh_lock_sock(sk); |
| if (!sock_owned_by_user(sk)) { |
| res = filter_rcv(sk, buf); |
| } else { |
| if (sk_add_backlog(sk, buf, rcvbuf_limit(sk, buf))) |
| res = TIPC_ERR_OVERLOAD; |
| else |
| res = TIPC_OK; |
| } |
| bh_unlock_sock(sk); |
| |
| return res; |
| } |
| |
| /** |
| * wakeupdispatch - wake up port after congestion |
| * @tport: port to wakeup |
| * |
| * Called with port lock already taken. |
| */ |
| static void wakeupdispatch(struct tipc_port *tport) |
| { |
| struct sock *sk = tport->sk; |
| |
| sk->sk_write_space(sk); |
| } |
| |
| static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) |
| { |
| struct sock *sk = sock->sk; |
| DEFINE_WAIT(wait); |
| int done; |
| |
| do { |
| int err = sock_error(sk); |
| if (err) |
| return err; |
| if (!*timeo_p) |
| return -ETIMEDOUT; |
| if (signal_pending(current)) |
| return sock_intr_errno(*timeo_p); |
| |
| prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
| done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING); |
| finish_wait(sk_sleep(sk), &wait); |
| } while (!done); |
| return 0; |
| } |
| |
| /** |
| * connect - establish a connection to another TIPC port |
| * @sock: socket structure |
| * @dest: socket address for destination port |
| * @destlen: size of socket address data structure |
| * @flags: file-related flags associated with socket |
| * |
| * Returns 0 on success, errno otherwise |
| */ |
| static int connect(struct socket *sock, struct sockaddr *dest, int destlen, |
| int flags) |
| { |
| struct sock *sk = sock->sk; |
| struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
| struct msghdr m = {NULL,}; |
| long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; |
| socket_state previous; |
| int res; |
| |
| lock_sock(sk); |
| |
| /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
| if (sock->state == SS_READY) { |
| res = -EOPNOTSUPP; |
| goto exit; |
| } |
| |
| /* |
| * Reject connection attempt using multicast address |
| * |
| * Note: send_msg() validates the rest of the address fields, |
| * so there's no need to do it here |
| */ |
| if (dst->addrtype == TIPC_ADDR_MCAST) { |
| res = -EINVAL; |
| goto exit; |
| } |
| |
| previous = sock->state; |
| switch (sock->state) { |
| case SS_UNCONNECTED: |
| /* Send a 'SYN-' to destination */ |
| m.msg_name = dest; |
| m.msg_namelen = destlen; |
| |
| /* If connect is in non-blocking case, set MSG_DONTWAIT to |
| * indicate send_msg() is never blocked. |
| */ |
| if (!timeout) |
| m.msg_flags = MSG_DONTWAIT; |
| |
| res = send_msg(NULL, sock, &m, 0); |
| if ((res < 0) && (res != -EWOULDBLOCK)) |
| goto exit; |
| |
| /* Just entered SS_CONNECTING state; the only |
| * difference is that return value in non-blocking |
| * case is EINPROGRESS, rather than EALREADY. |
| */ |
| res = -EINPROGRESS; |
| case SS_CONNECTING: |
| if (previous == SS_CONNECTING) |
| res = -EALREADY; |
| if (!timeout) |
| goto exit; |
| timeout = msecs_to_jiffies(timeout); |
| /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ |
| res = tipc_wait_for_connect(sock, &timeout); |
| break; |
| case SS_CONNECTED: |
| res = -EISCONN; |
| break; |
| default: |
| res = -EINVAL; |
| break; |
| } |
| exit: |
| release_sock(sk); |
| return res; |
| } |
| |
| /** |
| * listen - allow socket to listen for incoming connections |
| * @sock: socket structure |
| * @len: (unused) |
| * |
| * Returns 0 on success, errno otherwise |
| */ |
| static int listen(struct socket *sock, int len) |
| { |
| struct sock *sk = sock->sk; |
| int res; |
| |
| lock_sock(sk); |
| |
| if (sock->state != SS_UNCONNECTED) |
| res = -EINVAL; |
| else { |
| sock->state = SS_LISTENING; |
| res = 0; |
| } |
| |
| release_sock(sk); |
| return res; |
| } |
| |
| static int tipc_wait_for_accept(struct socket *sock, long timeo) |
| { |
| struct sock *sk = sock->sk; |
| DEFINE_WAIT(wait); |
| int err; |
| |
| /* True wake-one mechanism for incoming connections: only |
| * one process gets woken up, not the 'whole herd'. |
| * Since we do not 'race & poll' for established sockets |
| * anymore, the common case will execute the loop only once. |
| */ |
| for (;;) { |
| prepare_to_wait_exclusive(sk_sleep(sk), &wait, |
| TASK_INTERRUPTIBLE); |
| if (skb_queue_empty(&sk->sk_receive_queue)) { |
| release_sock(sk); |
| timeo = schedule_timeout(timeo); |
| lock_sock(sk); |
| } |
| err = 0; |
| if (!skb_queue_empty(&sk->sk_receive_queue)) |
| break; |
| err = -EINVAL; |
| if (sock->state != SS_LISTENING) |
| break; |
| err = sock_intr_errno(timeo); |
| if (signal_pending(current)) |
| break; |
| err = -EAGAIN; |
| if (!timeo) |
| break; |
| } |
| finish_wait(sk_sleep(sk), &wait); |
| return err; |
| } |
| |
| /** |
| * accept - wait for connection request |
| * @sock: listening socket |
| * @newsock: new socket that is to be connected |
| * @flags: file-related flags associated with socket |
| * |
| * Returns 0 on success, errno otherwise |
| */ |
| static int accept(struct socket *sock, struct socket *new_sock, int flags) |
| { |
| struct sock *new_sk, *sk = sock->sk; |
| struct sk_buff *buf; |
| struct tipc_sock *new_tsock; |
| struct tipc_port *new_tport; |
| struct tipc_msg *msg; |
| u32 new_ref; |
| long timeo; |
| int res; |
| |
| lock_sock(sk); |
| |
| if (sock->state != SS_LISTENING) { |
| res = -EINVAL; |
| goto exit; |
| } |
| |
| timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
| res = tipc_wait_for_accept(sock, timeo); |
| if (res) |
| goto exit; |
| |
| buf = skb_peek(&sk->sk_receive_queue); |
| |
| res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1); |
| if (res) |
| goto exit; |
| |
| new_sk = new_sock->sk; |
| new_tsock = tipc_sk(new_sk); |
| new_tport = new_tsock->p; |
| new_ref = new_tport->ref; |
| msg = buf_msg(buf); |
| |
| /* we lock on new_sk; but lockdep sees the lock on sk */ |
| lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); |
| |
| /* |
| * Reject any stray messages received by new socket |
| * before the socket lock was taken (very, very unlikely) |
| */ |
| reject_rx_queue(new_sk); |
| |
| /* Connect new socket to it's peer */ |
| new_tsock->peer_name.ref = msg_origport(msg); |
| new_tsock->peer_name.node = msg_orignode(msg); |
| tipc_connect(new_ref, &new_tsock->peer_name); |
| new_sock->state = SS_CONNECTED; |
| |
| tipc_set_portimportance(new_ref, msg_importance(msg)); |
| if (msg_named(msg)) { |
| new_tport->conn_type = msg_nametype(msg); |
| new_tport->conn_instance = msg_nameinst(msg); |
| } |
| |
| /* |
| * Respond to 'SYN-' by discarding it & returning 'ACK'-. |
| * Respond to 'SYN+' by queuing it on new socket. |
| */ |
| if (!msg_data_sz(msg)) { |
| struct msghdr m = {NULL,}; |
| |
| advance_rx_queue(sk); |
| send_packet(NULL, new_sock, &m, 0); |
| } else { |
| __skb_dequeue(&sk->sk_receive_queue); |
| __skb_queue_head(&new_sk->sk_receive_queue, buf); |
| skb_set_owner_r(buf, new_sk); |
| } |
| release_sock(new_sk); |
| |
| exit: |
| release_sock(sk); |
| return res; |
| } |
| |
| /** |
| * shutdown - shutdown socket connection |
| * @sock: socket structure |
| * @how: direction to close (must be SHUT_RDWR) |
| * |
| * Terminates connection (if necessary), then purges socket's receive queue. |
| * |
| * Returns 0 on success, errno otherwise |
| */ |
| static int shutdown(struct socket *sock, int how) |
| { |
| struct sock *sk = sock->sk; |
| struct tipc_port *tport = tipc_sk_port(sk); |
| struct sk_buff *buf; |
| int res; |
| |
| if (how != SHUT_RDWR) |
| return -EINVAL; |
| |
| lock_sock(sk); |
| |
| switch (sock->state) { |
| case SS_CONNECTING: |
| case SS_CONNECTED: |
| |
| restart: |
| /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
| buf = __skb_dequeue(&sk->sk_receive_queue); |
| if (buf) { |
| if (TIPC_SKB_CB(buf)->handle != NULL) { |
| kfree_skb(buf); |
| goto restart; |
| } |
| tipc_disconnect(tport->ref); |
| tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN); |
| } else { |
| tipc_shutdown(tport->ref); |
| } |
| |
| sock->state = SS_DISCONNECTING; |
| |
| /* fall through */ |
| |
| case SS_DISCONNECTING: |
| |
| /* Discard any unreceived messages */ |
| __skb_queue_purge(&sk->sk_receive_queue); |
| |
| /* Wake up anyone sleeping in poll */ |
| sk->sk_state_change(sk); |
| res = 0; |
| break; |
| |
| default: |
| res = -ENOTCONN; |
| } |
| |
| release_sock(sk); |
| return res; |
| } |
| |
| /** |
| * setsockopt - set socket option |
| * @sock: socket structure |
| * @lvl: option level |
| * @opt: option identifier |
| * @ov: pointer to new option value |
| * @ol: length of option value |
| * |
| * For stream sockets only, accepts and ignores all IPPROTO_TCP options |
| * (to ease compatibility). |
| * |
| * Returns 0 on success, errno otherwise |
| */ |
| static int setsockopt(struct socket *sock, int lvl, int opt, char __user *ov, |
| unsigned int ol) |
| { |
| struct sock *sk = sock->sk; |
| struct tipc_port *tport = tipc_sk_port(sk); |
| u32 value; |
| int res; |
| |
| if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
| return 0; |
| if (lvl != SOL_TIPC) |
| return -ENOPROTOOPT; |
| if (ol < sizeof(value)) |
| return -EINVAL; |
| res = get_user(value, (u32 __user *)ov); |
| if (res) |
| return res; |
| |
| lock_sock(sk); |
| |
| switch (opt) { |
| case TIPC_IMPORTANCE: |
| res = tipc_set_portimportance(tport->ref, value); |
| break; |
| case TIPC_SRC_DROPPABLE: |
| if (sock->type != SOCK_STREAM) |
| res = tipc_set_portunreliable(tport->ref, value); |
| else |
| res = -ENOPROTOOPT; |
| break; |
| case TIPC_DEST_DROPPABLE: |
| res = tipc_set_portunreturnable(tport->ref, value); |
| break; |
| case TIPC_CONN_TIMEOUT: |
| tipc_sk(sk)->conn_timeout = value; |
| /* no need to set "res", since already 0 at this point */ |
| break; |
| default: |
| res = -EINVAL; |
| } |
| |
| release_sock(sk); |
| |
| return res; |
| } |
| |
| /** |
| * getsockopt - get socket option |
| * @sock: socket structure |
| * @lvl: option level |
| * @opt: option identifier |
| * @ov: receptacle for option value |
| * @ol: receptacle for length of option value |
| * |
| * For stream sockets only, returns 0 length result for all IPPROTO_TCP options |
| * (to ease compatibility). |
| * |
| * Returns 0 on success, errno otherwise |
| */ |
| static int getsockopt(struct socket *sock, int lvl, int opt, char __user *ov, |
| int __user *ol) |
| { |
| struct sock *sk = sock->sk; |
| struct tipc_port *tport = tipc_sk_port(sk); |
| int len; |
| u32 value; |
| int res; |
| |
| if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
| return put_user(0, ol); |
| if (lvl != SOL_TIPC) |
| return -ENOPROTOOPT; |
| res = get_user(len, ol); |
| if (res) |
| return res; |
| |
| lock_sock(sk); |
| |
| switch (opt) { |
| case TIPC_IMPORTANCE: |
| res = tipc_portimportance(tport->ref, &value); |
| break; |
| case TIPC_SRC_DROPPABLE: |
| res = tipc_portunreliable(tport->ref, &value); |
| break; |
| case TIPC_DEST_DROPPABLE: |
| res = tipc_portunreturnable(tport->ref, &value); |
| break; |
| case TIPC_CONN_TIMEOUT: |
| value = tipc_sk(sk)->conn_timeout; |
| /* no need to set "res", since already 0 at this point */ |
| break; |
| case TIPC_NODE_RECVQ_DEPTH: |
| value = 0; /* was tipc_queue_size, now obsolete */ |
| break; |
| case TIPC_SOCK_RECVQ_DEPTH: |
| value = skb_queue_len(&sk->sk_receive_queue); |
| break; |
| default: |
| res = -EINVAL; |
| } |
| |
| release_sock(sk); |
| |
| if (res) |
| return res; /* "get" failed */ |
| |
| if (len < sizeof(value)) |
| return -EINVAL; |
| |
| if (copy_to_user(ov, &value, sizeof(value))) |
| return -EFAULT; |
| |
| return put_user(sizeof(value), ol); |
| } |
| |
| /* Protocol switches for the various types of TIPC sockets */ |
| |
| static const struct proto_ops msg_ops = { |
| .owner = THIS_MODULE, |
| .family = AF_TIPC, |
| .release = release, |
| .bind = bind, |
| .connect = connect, |
| .socketpair = sock_no_socketpair, |
| .accept = sock_no_accept, |
| .getname = get_name, |
| .poll = poll, |
| .ioctl = sock_no_ioctl, |
| .listen = sock_no_listen, |
| .shutdown = shutdown, |
| .setsockopt = setsockopt, |
| .getsockopt = getsockopt, |
| .sendmsg = send_msg, |
| .recvmsg = recv_msg, |
| .mmap = sock_no_mmap, |
| .sendpage = sock_no_sendpage |
| }; |
| |
| static const struct proto_ops packet_ops = { |
| .owner = THIS_MODULE, |
| .family = AF_TIPC, |
| .release = release, |
| .bind = bind, |
| .connect = connect, |
| .socketpair = sock_no_socketpair, |
| .accept = accept, |
| .getname = get_name, |
| .poll = poll, |
| .ioctl = sock_no_ioctl, |
| .listen = listen, |
| .shutdown = shutdown, |
| .setsockopt = setsockopt, |
| .getsockopt = getsockopt, |
| .sendmsg = send_packet, |
| .recvmsg = recv_msg, |
| .mmap = sock_no_mmap, |
| .sendpage = sock_no_sendpage |
| }; |
| |
| static const struct proto_ops stream_ops = { |
| .owner = THIS_MODULE, |
| .family = AF_TIPC, |
| .release = release, |
| .bind = bind, |
| .connect = connect, |
| .socketpair = sock_no_socketpair, |
| .accept = accept, |
| .getname = get_name, |
| .poll = poll, |
| .ioctl = sock_no_ioctl, |
| .listen = listen, |
| .shutdown = shutdown, |
| .setsockopt = setsockopt, |
| .getsockopt = getsockopt, |
| .sendmsg = send_stream, |
| .recvmsg = recv_stream, |
| .mmap = sock_no_mmap, |
| .sendpage = sock_no_sendpage |
| }; |
| |
| static const struct net_proto_family tipc_family_ops = { |
| .owner = THIS_MODULE, |
| .family = AF_TIPC, |
| .create = tipc_sk_create |
| }; |
| |
| static struct proto tipc_proto = { |
| .name = "TIPC", |
| .owner = THIS_MODULE, |
| .obj_size = sizeof(struct tipc_sock), |
| .sysctl_rmem = sysctl_tipc_rmem |
| }; |
| |
| static struct proto tipc_proto_kern = { |
| .name = "TIPC", |
| .obj_size = sizeof(struct tipc_sock), |
| .sysctl_rmem = sysctl_tipc_rmem |
| }; |
| |
| /** |
| * tipc_socket_init - initialize TIPC socket interface |
| * |
| * Returns 0 on success, errno otherwise |
| */ |
| int tipc_socket_init(void) |
| { |
| int res; |
| |
| res = proto_register(&tipc_proto, 1); |
| if (res) { |
| pr_err("Failed to register TIPC protocol type\n"); |
| goto out; |
| } |
| |
| res = sock_register(&tipc_family_ops); |
| if (res) { |
| pr_err("Failed to register TIPC socket type\n"); |
| proto_unregister(&tipc_proto); |
| goto out; |
| } |
| out: |
| return res; |
| } |
| |
| /** |
| * tipc_socket_stop - stop TIPC socket interface |
| */ |
| void tipc_socket_stop(void) |
| { |
| sock_unregister(tipc_family_ops.family); |
| proto_unregister(&tipc_proto); |
| } |