| /* |
| * net/tipc/socket.c: TIPC socket API |
| * |
| * Copyright (c) 2003-2005, Ericsson Research Canada |
| * Copyright (c) 2004-2005, Wind River Systems |
| * Copyright (c) 2005-2006, Ericsson AB |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * Redistributions of source code must retain the above copyright notice, this |
| * list of conditions and the following disclaimer. |
| * 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. |
| * 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. |
| * |
| * 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/version.h> |
| #include <linux/fcntl.h> |
| #include <linux/version.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 inline void sock_lock(struct tipc_sock* tsock) |
| { |
| spin_lock_bh(tsock->p->lock); |
| } |
| |
| /* |
| * sock_unlock(): Unlock a port/socket pair |
| */ |
| static inline 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 inline 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 inline 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 ((sock->type != SOCK_STREAM) && |
| (sock->type != SOCK_SEQPACKET) && |
| (sock->type != SOCK_DGRAM) && |
| (sock->type != SOCK_RDM)) |
| return -EPROTOTYPE; |
| |
| if (unlikely(protocol != 0)) |
| return -EPROTONOSUPPORT; |
| |
| ref = tipc_createport_raw(0, &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; |
| } |
| |
| 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 = 0; |
| 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, 0); |
| 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 inline 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: (unused) |
| * |
| * 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(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 (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); |
| } |
| else if (dest->addrtype == TIPC_ADDR_ID) { |
| res = tipc_send2port(tsock->p->ref, |
| &dest->addr.id, |
| m->msg_iovlen, |
| m->msg_iov); |
| } |
| else if (dest->addrtype == TIPC_ADDR_MCAST) { |
| if (needs_conn) { |
| res = -EOPNOTSUPP; |
| goto exit; |
| } |
| if ((res = dest_name_check(dest, m))) |
| goto exit; |
| res = tipc_multicast(tsock->p->ref, |
| &dest->addr.nameseq, |
| 0, |
| m->msg_iovlen, |
| m->msg_iov); |
| } |
| if (likely(res != -ELINKCONG)) { |
| exit: |
| up(&tsock->sem); |
| return res; |
| } |
| if (m->msg_flags & MSG_DONTWAIT) { |
| res = -EWOULDBLOCK; |
| goto exit; |
| } |
| if (wait_event_interruptible(*sock->sk->sk_sleep, |
| !tsock->p->congested)) { |
| res = -ERESTARTSYS; |
| goto exit; |
| } |
| } while (1); |
| } |
| |
| /** |
| * send_packet - send a connection-oriented message |
| * @iocb: (unused) |
| * @sock: socket structure |
| * @m: message to send |
| * @total_len: (unused) |
| * |
| * 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 tipc_sock *tsock = tipc_sk(sock->sk); |
| struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
| int res; |
| |
| /* Handle implied connection establishment */ |
| |
| if (unlikely(dest)) |
| return send_msg(iocb, sock, m, total_len); |
| |
| if (down_interruptible(&tsock->sem)) { |
| return -ERESTARTSYS; |
| } |
| |
| if (unlikely(sock->state != SS_CONNECTED)) { |
| if (sock->state == SS_DISCONNECTING) |
| res = -EPIPE; |
| else |
| res = -ENOTCONN; |
| goto exit; |
| } |
| |
| do { |
| res = tipc_send(tsock->p->ref, m->msg_iovlen, m->msg_iov); |
| if (likely(res != -ELINKCONG)) { |
| exit: |
| up(&tsock->sem); |
| return res; |
| } |
| if (m->msg_flags & MSG_DONTWAIT) { |
| res = -EWOULDBLOCK; |
| goto exit; |
| } |
| if (wait_event_interruptible(*sock->sk->sk_sleep, |
| !tsock->p->congested)) { |
| res = -ERESTARTSYS; |
| goto exit; |
| } |
| } while (1); |
| } |
| |
| /** |
| * 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 errno otherwise |
| */ |
| |
| |
| static int send_stream(struct kiocb *iocb, struct socket *sock, |
| struct msghdr *m, size_t total_len) |
| { |
| struct msghdr my_msg; |
| struct iovec my_iov; |
| struct iovec *curr_iov; |
| int curr_iovlen; |
| char __user *curr_start; |
| int curr_left; |
| int bytes_to_send; |
| int res; |
| |
| if (likely(total_len <= TIPC_MAX_USER_MSG_SIZE)) |
| return send_packet(iocb, sock, m, total_len); |
| |
| /* Can only send large data streams if already connected */ |
| |
| if (unlikely(sock->state != SS_CONNECTED)) { |
| if (sock->state == SS_DISCONNECTING) |
| return -EPIPE; |
| else |
| return -ENOTCONN; |
| } |
| |
| /* |
| * 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(). |
| */ |
| |
| my_msg = *m; |
| curr_iov = my_msg.msg_iov; |
| curr_iovlen = my_msg.msg_iovlen; |
| my_msg.msg_iov = &my_iov; |
| my_msg.msg_iovlen = 1; |
| |
| while (curr_iovlen--) { |
| curr_start = curr_iov->iov_base; |
| curr_left = curr_iov->iov_len; |
| |
| while (curr_left) { |
| bytes_to_send = (curr_left < TIPC_MAX_USER_MSG_SIZE) |
| ? curr_left : TIPC_MAX_USER_MSG_SIZE; |
| my_iov.iov_base = curr_start; |
| my_iov.iov_len = bytes_to_send; |
| if ((res = send_packet(iocb, sock, &my_msg, 0)) < 0) |
| return res; |
| curr_left -= bytes_to_send; |
| curr_start += bytes_to_send; |
| } |
| |
| curr_iov++; |
| } |
| |
| return total_len; |
| } |
| |
| /** |
| * auto_connect - complete connection setup to a remote port |
| * @sock: socket structure |
| * @tsock: TIPC-specific socket structure |
| * @msg: peer's response message |
| * |
| * Returns 0 on success, errno otherwise |
| */ |
| |
| static int auto_connect(struct socket *sock, struct tipc_sock *tsock, |
| struct tipc_msg *msg) |
| { |
| struct tipc_portid peer; |
| |
| if (msg_errcode(msg)) { |
| sock->state = SS_DISCONNECTING; |
| return -ECONNREFUSED; |
| } |
| |
| peer.ref = msg_origport(msg); |
| peer.node = msg_orignode(msg); |
| tipc_connect2port(tsock->p->ref, &peer); |
| tipc_set_portimportance(tsock->p->ref, 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 inline void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
| { |
| struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name; |
| |
| if (addr) { |
| addr->family = AF_TIPC; |
| addr->addrtype = TIPC_ADDR_ID; |
| 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 inline 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 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); |
| if ((res = put_cmsg(m, SOL_SOCKET, TIPC_ERRINFO, 8, anc_data))) |
| return res; |
| if (anc_data[1] && |
| (res = put_cmsg(m, SOL_SOCKET, TIPC_RETDATA, anc_data[1], |
| msg_data(msg)))) |
| return res; |
| } |
| |
| /* Optionally capture message destination object */ |
| |
| dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
| switch (dest_type) { |
| case TIPC_NAMED_MSG: |
| anc_data[0] = msg_nametype(msg); |
| anc_data[1] = msg_namelower(msg); |
| anc_data[2] = msg_namelower(msg); |
| break; |
| case TIPC_MCAST_MSG: |
| anc_data[0] = msg_nametype(msg); |
| anc_data[1] = msg_namelower(msg); |
| anc_data[2] = msg_nameupper(msg); |
| break; |
| case TIPC_CONN_MSG: |
| anc_data[0] = tport->conn_type; |
| anc_data[1] = tport->conn_instance; |
| anc_data[2] = tport->conn_instance; |
| break; |
| default: |
| anc_data[0] = 0; |
| } |
| if (anc_data[0] && |
| (res = put_cmsg(m, SOL_SOCKET, TIPC_DESTNAME, 12, anc_data))) |
| return res; |
| |
| return 0; |
| } |
| |
| /** |
| * 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 tipc_sock *tsock = tipc_sk(sock->sk); |
| struct sk_buff *buf; |
| struct tipc_msg *msg; |
| unsigned int q_len; |
| unsigned int sz; |
| u32 err; |
| int res; |
| |
| /* Currently doesn't support receiving into multiple iovec entries */ |
| |
| if (m->msg_iovlen != 1) |
| return -EOPNOTSUPP; |
| |
| /* Catch invalid receive attempts */ |
| |
| if (unlikely(!buf_len)) |
| return -EINVAL; |
| |
| if (sock->type == SOCK_SEQPACKET) { |
| if (unlikely(sock->state == SS_UNCONNECTED)) |
| return -ENOTCONN; |
| if (unlikely((sock->state == SS_DISCONNECTING) && |
| (skb_queue_len(&sock->sk->sk_receive_queue) == 0))) |
| return -ENOTCONN; |
| } |
| |
| /* Look for a message in receive queue; wait if necessary */ |
| |
| if (unlikely(down_interruptible(&tsock->sem))) |
| return -ERESTARTSYS; |
| |
| restart: |
| if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) && |
| (flags & MSG_DONTWAIT))) { |
| res = -EWOULDBLOCK; |
| goto exit; |
| } |
| |
| if ((res = wait_event_interruptible( |
| *sock->sk->sk_sleep, |
| ((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) || |
| (sock->state == SS_DISCONNECTING))) )) { |
| goto exit; |
| } |
| |
| /* Catch attempt to receive on an already terminated connection */ |
| /* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */ |
| |
| if (!q_len) { |
| res = -ENOTCONN; |
| goto exit; |
| } |
| |
| /* Get access to first message in receive queue */ |
| |
| buf = skb_peek(&sock->sk->sk_receive_queue); |
| msg = buf_msg(buf); |
| sz = msg_data_sz(msg); |
| err = msg_errcode(msg); |
| |
| /* Complete connection setup for an implied connect */ |
| |
| if (unlikely(sock->state == SS_CONNECTING)) { |
| if ((res = auto_connect(sock, tsock, msg))) |
| goto exit; |
| } |
| |
| /* Discard an empty non-errored message & try again */ |
| |
| if ((!sz) && (!err)) { |
| advance_queue(tsock); |
| goto restart; |
| } |
| |
| /* Capture sender's address (optional) */ |
| |
| set_orig_addr(m, msg); |
| |
| /* Capture ancillary data (optional) */ |
| |
| if ((res = anc_data_recv(m, msg, tsock->p))) |
| 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; |
| } |
| if (unlikely(copy_to_user(m->msg_iov->iov_base, msg_data(msg), |
| sz))) { |
| res = -EFAULT; |
| 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 (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
| tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked); |
| advance_queue(tsock); |
| } |
| exit: |
| up(&tsock->sem); |
| 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 tipc_sock *tsock = tipc_sk(sock->sk); |
| struct sk_buff *buf; |
| struct tipc_msg *msg; |
| unsigned int q_len; |
| unsigned int sz; |
| int sz_to_copy; |
| int sz_copied = 0; |
| int needed; |
| char *crs = m->msg_iov->iov_base; |
| unsigned char *buf_crs; |
| u32 err; |
| int res; |
| |
| /* Currently doesn't support receiving into multiple iovec entries */ |
| |
| if (m->msg_iovlen != 1) |
| return -EOPNOTSUPP; |
| |
| /* Catch invalid receive attempts */ |
| |
| if (unlikely(!buf_len)) |
| return -EINVAL; |
| |
| if (unlikely(sock->state == SS_DISCONNECTING)) { |
| if (skb_queue_len(&sock->sk->sk_receive_queue) == 0) |
| return -ENOTCONN; |
| } else if (unlikely(sock->state != SS_CONNECTED)) |
| return -ENOTCONN; |
| |
| /* Look for a message in receive queue; wait if necessary */ |
| |
| if (unlikely(down_interruptible(&tsock->sem))) |
| return -ERESTARTSYS; |
| |
| restart: |
| if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) && |
| (flags & MSG_DONTWAIT))) { |
| res = (sz_copied == 0) ? -EWOULDBLOCK : 0; |
| goto exit; |
| } |
| |
| if ((res = wait_event_interruptible( |
| *sock->sk->sk_sleep, |
| ((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) || |
| (sock->state == SS_DISCONNECTING))) )) { |
| goto exit; |
| } |
| |
| /* Catch attempt to receive on an already terminated connection */ |
| /* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */ |
| |
| if (!q_len) { |
| res = -ENOTCONN; |
| goto exit; |
| } |
| |
| /* Get access to first message in receive queue */ |
| |
| buf = skb_peek(&sock->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_queue(tsock); |
| goto restart; |
| } |
| |
| /* Optionally capture sender's address & ancillary data of first msg */ |
| |
| if (sz_copied == 0) { |
| set_orig_addr(m, msg); |
| if ((res = anc_data_recv(m, msg, tsock->p))) |
| goto exit; |
| } |
| |
| /* Capture message data (if valid) & compute return value (always) */ |
| |
| if (!err) { |
| buf_crs = (unsigned char *)(TIPC_SKB_CB(buf)->handle); |
| sz = buf->tail - buf_crs; |
| |
| needed = (buf_len - sz_copied); |
| sz_to_copy = (sz <= needed) ? sz : needed; |
| if (unlikely(copy_to_user(crs, buf_crs, sz_to_copy))) { |
| res = -EFAULT; |
| goto exit; |
| } |
| sz_copied += sz_to_copy; |
| |
| if (sz_to_copy < sz) { |
| if (!(flags & MSG_PEEK)) |
| TIPC_SKB_CB(buf)->handle = buf_crs + sz_to_copy; |
| goto exit; |
| } |
| |
| crs += sz_to_copy; |
| } 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(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
| tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked); |
| advance_queue(tsock); |
| } |
| |
| /* Loop around if more data is required */ |
| |
| if ((sz_copied < buf_len) /* didn't get all requested data */ |
| && (flags & MSG_WAITALL) /* ... and need to wait for more */ |
| && (!(flags & MSG_PEEK)) /* ... and aren't just peeking at data */ |
| && (!err) /* ... and haven't reached a FIN */ |
| ) |
| goto restart; |
| |
| exit: |
| up(&tsock->sem); |
| return res ? res : sz_copied; |
| } |
| |
| /** |
| * queue_overloaded - test if queue overload condition exists |
| * @queue_size: current size of queue |
| * @base: nominal maximum size of queue |
| * @msg: message to be added to queue |
| * |
| * Returns 1 if queue is currently overloaded, 0 otherwise |
| */ |
| |
| static int queue_overloaded(u32 queue_size, u32 base, struct tipc_msg *msg) |
| { |
| u32 threshold; |
| u32 imp = msg_importance(msg); |
| |
| if (imp == TIPC_LOW_IMPORTANCE) |
| threshold = base; |
| else if (imp == TIPC_MEDIUM_IMPORTANCE) |
| threshold = base * 2; |
| else if (imp == TIPC_HIGH_IMPORTANCE) |
| threshold = base * 100; |
| else |
| return 0; |
| |
| if (msg_connected(msg)) |
| threshold *= 4; |
| |
| return (queue_size > threshold); |
| } |
| |
| /** |
| * async_disconnect - wrapper function used to disconnect port |
| * @portref: TIPC port reference (passed as pointer-sized value) |
| */ |
| |
| static void async_disconnect(unsigned long portref) |
| { |
| tipc_disconnect((u32)portref); |
| } |
| |
| /** |
| * dispatch - handle arriving message |
| * @tport: TIPC port that received message |
| * @buf: message |
| * |
| * Called with port locked. Must not take socket lock to avoid deadlock risk. |
| * |
| * 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 tipc_msg *msg = buf_msg(buf); |
| struct tipc_sock *tsock = (struct tipc_sock *)tport->usr_handle; |
| struct socket *sock; |
| u32 recv_q_len; |
| |
| /* Reject message if socket is closing */ |
| |
| if (!tsock) |
| return TIPC_ERR_NO_PORT; |
| |
| /* Reject message if it is wrong sort of message for socket */ |
| |
| /* |
| * WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD? |
| * "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY |
| * BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC |
| */ |
| sock = tsock->sk.sk_socket; |
| if (sock->state == SS_READY) { |
| if (msg_connected(msg)) { |
| msg_dbg(msg, "dispatch filter 1\n"); |
| return TIPC_ERR_NO_PORT; |
| } |
| } else { |
| if (msg_mcast(msg)) { |
| msg_dbg(msg, "dispatch filter 2\n"); |
| return TIPC_ERR_NO_PORT; |
| } |
| if (sock->state == SS_CONNECTED) { |
| if (!msg_connected(msg)) { |
| msg_dbg(msg, "dispatch filter 3\n"); |
| return TIPC_ERR_NO_PORT; |
| } |
| } |
| else if (sock->state == SS_CONNECTING) { |
| if (!msg_connected(msg) && (msg_errcode(msg) == 0)) { |
| msg_dbg(msg, "dispatch filter 4\n"); |
| return TIPC_ERR_NO_PORT; |
| } |
| } |
| else if (sock->state == SS_LISTENING) { |
| if (msg_connected(msg) || msg_errcode(msg)) { |
| msg_dbg(msg, "dispatch filter 5\n"); |
| return TIPC_ERR_NO_PORT; |
| } |
| } |
| else if (sock->state == SS_DISCONNECTING) { |
| msg_dbg(msg, "dispatch filter 6\n"); |
| return TIPC_ERR_NO_PORT; |
| } |
| else /* (sock->state == SS_UNCONNECTED) */ { |
| if (msg_connected(msg) || msg_errcode(msg)) { |
| msg_dbg(msg, "dispatch filter 7\n"); |
| return TIPC_ERR_NO_PORT; |
| } |
| } |
| } |
| |
| /* Reject message if there isn't room to queue it */ |
| |
| if (unlikely((u32)atomic_read(&tipc_queue_size) > |
| OVERLOAD_LIMIT_BASE)) { |
| if (queue_overloaded(atomic_read(&tipc_queue_size), |
| OVERLOAD_LIMIT_BASE, msg)) |
| return TIPC_ERR_OVERLOAD; |
| } |
| recv_q_len = skb_queue_len(&tsock->sk.sk_receive_queue); |
| if (unlikely(recv_q_len > (OVERLOAD_LIMIT_BASE / 2))) { |
| if (queue_overloaded(recv_q_len, |
| OVERLOAD_LIMIT_BASE / 2, msg)) |
| return TIPC_ERR_OVERLOAD; |
| } |
| |
| /* Initiate connection termination for an incoming 'FIN' */ |
| |
| if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) { |
| sock->state = SS_DISCONNECTING; |
| /* Note: Use signal since port lock is already taken! */ |
| k_signal((Handler)async_disconnect, tport->ref); |
| } |
| |
| /* Enqueue message (finally!) */ |
| |
| msg_dbg(msg,"<DISP<: "); |
| TIPC_SKB_CB(buf)->handle = msg_data(msg); |
| atomic_inc(&tipc_queue_size); |
| skb_queue_tail(&sock->sk->sk_receive_queue, buf); |
| |
| wake_up_interruptible(sock->sk->sk_sleep); |
| return TIPC_OK; |
| } |
| |
| /** |
| * wakeupdispatch - wake up port after congestion |
| * @tport: port to wakeup |
| * |
| * Called with port lock on. |
| */ |
| |
| static void wakeupdispatch(struct tipc_port *tport) |
| { |
| struct tipc_sock *tsock = (struct tipc_sock *)tport->usr_handle; |
| |
| wake_up_interruptible(tsock->sk.sk_sleep); |
| } |
| |
| /** |
| * 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: (unused) |
| * |
| * Returns 0 on success, errno otherwise |
| */ |
| |
| static int connect(struct socket *sock, struct sockaddr *dest, int destlen, |
| int flags) |
| { |
| struct tipc_sock *tsock = tipc_sk(sock->sk); |
| struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
| struct msghdr m = {0,}; |
| struct sk_buff *buf; |
| struct tipc_msg *msg; |
| int res; |
| |
| /* For now, TIPC does not allow use of connect() with DGRAM or RDM types */ |
| |
| if (sock->state == SS_READY) |
| return -EOPNOTSUPP; |
| |
| /* MOVE THE REST OF THIS ERROR CHECKING TO send_msg()? */ |
| if (sock->state == SS_LISTENING) |
| return -EOPNOTSUPP; |
| if (sock->state == SS_CONNECTING) |
| return -EALREADY; |
| if (sock->state != SS_UNCONNECTED) |
| return -EISCONN; |
| |
| if ((dst->family != AF_TIPC) || |
| ((dst->addrtype != TIPC_ADDR_NAME) && (dst->addrtype != TIPC_ADDR_ID))) |
| return -EINVAL; |
| |
| /* Send a 'SYN-' to destination */ |
| |
| m.msg_name = dest; |
| if ((res = send_msg(0, sock, &m, 0)) < 0) { |
| sock->state = SS_DISCONNECTING; |
| return res; |
| } |
| |
| if (down_interruptible(&tsock->sem)) |
| return -ERESTARTSYS; |
| |
| /* Wait for destination's 'ACK' response */ |
| |
| res = wait_event_interruptible_timeout(*sock->sk->sk_sleep, |
| skb_queue_len(&sock->sk->sk_receive_queue), |
| sock->sk->sk_rcvtimeo); |
| buf = skb_peek(&sock->sk->sk_receive_queue); |
| if (res > 0) { |
| msg = buf_msg(buf); |
| res = auto_connect(sock, tsock, msg); |
| if (!res) { |
| if (dst->addrtype == TIPC_ADDR_NAME) { |
| tsock->p->conn_type = dst->addr.name.name.type; |
| tsock->p->conn_instance = dst->addr.name.name.instance; |
| } |
| if (!msg_data_sz(msg)) |
| advance_queue(tsock); |
| } |
| } else { |
| if (res == 0) { |
| res = -ETIMEDOUT; |
| } else |
| { /* leave "res" unchanged */ } |
| sock->state = SS_DISCONNECTING; |
| } |
| |
| up(&tsock->sem); |
| 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) |
| { |
| /* REQUIRES SOCKET LOCKING OF SOME SORT? */ |
| |
| if (sock->state == SS_READY) |
| return -EOPNOTSUPP; |
| if (sock->state != SS_UNCONNECTED) |
| return -EINVAL; |
| sock->state = SS_LISTENING; |
| return 0; |
| } |
| |
| /** |
| * 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 *newsock, int flags) |
| { |
| struct tipc_sock *tsock = tipc_sk(sock->sk); |
| struct sk_buff *buf; |
| int res = -EFAULT; |
| |
| if (sock->state == SS_READY) |
| return -EOPNOTSUPP; |
| if (sock->state != SS_LISTENING) |
| return -EINVAL; |
| |
| if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) && |
| (flags & O_NONBLOCK))) |
| return -EWOULDBLOCK; |
| |
| if (down_interruptible(&tsock->sem)) |
| return -ERESTARTSYS; |
| |
| if (wait_event_interruptible(*sock->sk->sk_sleep, |
| skb_queue_len(&sock->sk->sk_receive_queue))) { |
| res = -ERESTARTSYS; |
| goto exit; |
| } |
| buf = skb_peek(&sock->sk->sk_receive_queue); |
| |
| res = tipc_create(newsock, 0); |
| if (!res) { |
| struct tipc_sock *new_tsock = tipc_sk(newsock->sk); |
| struct tipc_portid id; |
| struct tipc_msg *msg = buf_msg(buf); |
| u32 new_ref = new_tsock->p->ref; |
| |
| id.ref = msg_origport(msg); |
| id.node = msg_orignode(msg); |
| tipc_connect2port(new_ref, &id); |
| newsock->state = SS_CONNECTED; |
| |
| tipc_set_portimportance(new_ref, msg_importance(msg)); |
| if (msg_named(msg)) { |
| new_tsock->p->conn_type = msg_nametype(msg); |
| new_tsock->p->conn_instance = msg_nameinst(msg); |
| } |
| |
| /* |
| * Respond to 'SYN-' by discarding it & returning 'ACK'-. |
| * Respond to 'SYN+' by queuing it on new socket. |
| */ |
| |
| msg_dbg(msg,"<ACC<: "); |
| if (!msg_data_sz(msg)) { |
| struct msghdr m = {0,}; |
| |
| send_packet(0, newsock, &m, 0); |
| advance_queue(tsock); |
| } else { |
| sock_lock(tsock); |
| skb_dequeue(&sock->sk->sk_receive_queue); |
| sock_unlock(tsock); |
| skb_queue_head(&newsock->sk->sk_receive_queue, buf); |
| } |
| } |
| exit: |
| up(&tsock->sem); |
| return res; |
| } |
| |
| /** |
| * shutdown - shutdown socket connection |
| * @sock: socket structure |
| * @how: direction to close (always treated as read + write) |
| * |
| * 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 tipc_sock* tsock = tipc_sk(sock->sk); |
| struct sk_buff *buf; |
| int res; |
| |
| /* Could return -EINVAL for an invalid "how", but why bother? */ |
| |
| if (down_interruptible(&tsock->sem)) |
| return -ERESTARTSYS; |
| |
| sock_lock(tsock); |
| |
| switch (sock->state) { |
| case SS_CONNECTED: |
| |
| /* Send 'FIN+' or 'FIN-' message to peer */ |
| |
| sock_unlock(tsock); |
| restart: |
| if ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) { |
| atomic_dec(&tipc_queue_size); |
| if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) { |
| buf_discard(buf); |
| goto restart; |
| } |
| tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN); |
| } |
| else { |
| tipc_shutdown(tsock->p->ref); |
| } |
| sock_lock(tsock); |
| |
| /* fall through */ |
| |
| case SS_DISCONNECTING: |
| |
| /* Discard any unreceived messages */ |
| |
| while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) { |
| atomic_dec(&tipc_queue_size); |
| buf_discard(buf); |
| } |
| tsock->p->conn_unacked = 0; |
| |
| /* fall through */ |
| |
| case SS_CONNECTING: |
| sock->state = SS_DISCONNECTING; |
| res = 0; |
| break; |
| |
| default: |
| res = -ENOTCONN; |
| } |
| |
| sock_unlock(tsock); |
| |
| up(&tsock->sem); |
| 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 *ov, int ol) |
| { |
| struct tipc_sock *tsock = tipc_sk(sock->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; |
| if ((res = get_user(value, (u32 *)ov))) |
| return res; |
| |
| if (down_interruptible(&tsock->sem)) |
| return -ERESTARTSYS; |
| |
| switch (opt) { |
| case TIPC_IMPORTANCE: |
| res = tipc_set_portimportance(tsock->p->ref, value); |
| break; |
| case TIPC_SRC_DROPPABLE: |
| if (sock->type != SOCK_STREAM) |
| res = tipc_set_portunreliable(tsock->p->ref, value); |
| else |
| res = -ENOPROTOOPT; |
| break; |
| case TIPC_DEST_DROPPABLE: |
| res = tipc_set_portunreturnable(tsock->p->ref, value); |
| break; |
| case TIPC_CONN_TIMEOUT: |
| sock->sk->sk_rcvtimeo = (value * HZ / 1000); |
| break; |
| default: |
| res = -EINVAL; |
| } |
| |
| up(&tsock->sem); |
| 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 *ov, int *ol) |
| { |
| struct tipc_sock *tsock = tipc_sk(sock->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; |
| if ((res = get_user(len, ol))) |
| return res; |
| |
| if (down_interruptible(&tsock->sem)) |
| return -ERESTARTSYS; |
| |
| switch (opt) { |
| case TIPC_IMPORTANCE: |
| res = tipc_portimportance(tsock->p->ref, &value); |
| break; |
| case TIPC_SRC_DROPPABLE: |
| res = tipc_portunreliable(tsock->p->ref, &value); |
| break; |
| case TIPC_DEST_DROPPABLE: |
| res = tipc_portunreturnable(tsock->p->ref, &value); |
| break; |
| case TIPC_CONN_TIMEOUT: |
| value = (sock->sk->sk_rcvtimeo * 1000) / HZ; |
| break; |
| default: |
| res = -EINVAL; |
| } |
| |
| if (res) { |
| /* "get" failed */ |
| } |
| else if (len < sizeof(value)) { |
| res = -EINVAL; |
| } |
| else if ((res = copy_to_user(ov, &value, sizeof(value)))) { |
| /* couldn't return value */ |
| } |
| else { |
| res = put_user(sizeof(value), ol); |
| } |
| |
| up(&tsock->sem); |
| return res; |
| } |
| |
| /** |
| * Placeholders for non-implemented functionality |
| * |
| * Returns error code (POSIX-compliant where defined) |
| */ |
| |
| static int ioctl(struct socket *s, u32 cmd, unsigned long arg) |
| { |
| return -EINVAL; |
| } |
| |
| static int no_mmap(struct file *file, struct socket *sock, |
| struct vm_area_struct *vma) |
| { |
| return -EINVAL; |
| } |
| static ssize_t no_sendpage(struct socket *sock, struct page *page, |
| int offset, size_t size, int flags) |
| { |
| return -EINVAL; |
| } |
| |
| static int no_skpair(struct socket *s1, struct socket *s2) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| /** |
| * Protocol switches for the various types of TIPC sockets |
| */ |
| |
| static struct proto_ops msg_ops = { |
| .owner = THIS_MODULE, |
| .family = AF_TIPC, |
| .release = release, |
| .bind = bind, |
| .connect = connect, |
| .socketpair = no_skpair, |
| .accept = accept, |
| .getname = get_name, |
| .poll = poll, |
| .ioctl = ioctl, |
| .listen = listen, |
| .shutdown = shutdown, |
| .setsockopt = setsockopt, |
| .getsockopt = getsockopt, |
| .sendmsg = send_msg, |
| .recvmsg = recv_msg, |
| .mmap = no_mmap, |
| .sendpage = no_sendpage |
| }; |
| |
| static struct proto_ops packet_ops = { |
| .owner = THIS_MODULE, |
| .family = AF_TIPC, |
| .release = release, |
| .bind = bind, |
| .connect = connect, |
| .socketpair = no_skpair, |
| .accept = accept, |
| .getname = get_name, |
| .poll = poll, |
| .ioctl = ioctl, |
| .listen = listen, |
| .shutdown = shutdown, |
| .setsockopt = setsockopt, |
| .getsockopt = getsockopt, |
| .sendmsg = send_packet, |
| .recvmsg = recv_msg, |
| .mmap = no_mmap, |
| .sendpage = no_sendpage |
| }; |
| |
| static struct proto_ops stream_ops = { |
| .owner = THIS_MODULE, |
| .family = AF_TIPC, |
| .release = release, |
| .bind = bind, |
| .connect = connect, |
| .socketpair = no_skpair, |
| .accept = accept, |
| .getname = get_name, |
| .poll = poll, |
| .ioctl = ioctl, |
| .listen = listen, |
| .shutdown = shutdown, |
| .setsockopt = setsockopt, |
| .getsockopt = getsockopt, |
| .sendmsg = send_stream, |
| .recvmsg = recv_stream, |
| .mmap = no_mmap, |
| .sendpage = no_sendpage |
| }; |
| |
| static struct net_proto_family tipc_family_ops = { |
| .owner = THIS_MODULE, |
| .family = AF_TIPC, |
| .create = tipc_create |
| }; |
| |
| static struct proto tipc_proto = { |
| .name = "TIPC", |
| .owner = THIS_MODULE, |
| .obj_size = sizeof(struct tipc_sock) |
| }; |
| |
| /** |
| * socket_init - initialize TIPC socket interface |
| * |
| * Returns 0 on success, errno otherwise |
| */ |
| int socket_init(void) |
| { |
| int res; |
| |
| res = proto_register(&tipc_proto, 1); |
| if (res) { |
| err("Unable to register TIPC protocol type\n"); |
| goto out; |
| } |
| |
| res = sock_register(&tipc_family_ops); |
| if (res) { |
| err("Unable to register TIPC socket type\n"); |
| proto_unregister(&tipc_proto); |
| goto out; |
| } |
| |
| sockets_enabled = 1; |
| out: |
| return res; |
| } |
| |
| /** |
| * sock_stop - stop TIPC socket interface |
| */ |
| void socket_stop(void) |
| { |
| if (!sockets_enabled) |
| return; |
| |
| sockets_enabled = 0; |
| sock_unregister(tipc_family_ops.family); |
| proto_unregister(&tipc_proto); |
| } |
| |