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Diffstat (limited to 'net/tipc/socket.c')
| -rw-r--r-- | net/tipc/socket.c | 1899 |
1 files changed, 1899 insertions, 0 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c new file mode 100644 index 00000000..29e957f6 --- /dev/null +++ b/net/tipc/socket.c @@ -0,0 +1,1899 @@ +/* + * net/tipc/socket.c: TIPC socket API + * + * Copyright (c) 2001-2007, Ericsson AB + * Copyright (c) 2004-2008, 2010-2011, Wind River Systems + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the names of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <linux/export.h> +#include <net/sock.h> + +#include "core.h" +#include "port.h" + +#define SS_LISTENING -1 /* socket is listening */ +#define SS_READY -2 /* socket is connectionless */ + +#define OVERLOAD_LIMIT_BASE 5000 +#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) ((struct tipc_port *)(tipc_sk(sk)->p)) + +#define tipc_rx_ready(sock) (!skb_queue_empty(&sock->sk->sk_receive_queue) || \ + (sock->state == SS_DISCONNECTING)) + +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 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 int sockets_enabled; + +static atomic_t tipc_queue_size = ATOMIC_INIT(0); + +/* + * 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)); + atomic_dec(&tipc_queue_size); +} + +/** + * discard_rx_queue - discard all buffers in socket receive queue + * + * Caller must hold socket lock + */ + +static void discard_rx_queue(struct sock *sk) +{ + struct sk_buff *buf; + + while ((buf = __skb_dequeue(&sk->sk_receive_queue))) { + atomic_dec(&tipc_queue_size); + kfree_skb(buf); + } +} + +/** + * 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); + atomic_dec(&tipc_queue_size); + } +} + +/** + * tipc_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_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 */ + + sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); + if (sk == NULL) + return -ENOMEM; + + /* Allocate TIPC port for socket to use */ + + tp_ptr = tipc_createport_raw(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; + 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; +} + +/** + * 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; + atomic_dec(&tipc_queue_size); + if (TIPC_SKB_CB(buf)->handle != 0) + 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->ref); + + /* Discard any remaining (connection-based) messages in receive queue */ + + discard_rx_queue(sk); + + /* 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 sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; + u32 portref = tipc_sk_port(sock->sk)->ref; + + if (unlikely(!uaddr_len)) + return tipc_withdraw(portref, 0, NULL); + + if (uaddr_len < sizeof(struct sockaddr_tipc)) + return -EINVAL; + if (addr->family != AF_TIPC) + return -EAFNOSUPPORT; + + if (addr->addrtype == TIPC_ADDR_NAME) + addr->addr.nameseq.upper = addr->addr.nameseq.lower; + else if (addr->addrtype != TIPC_ADDR_NAMESEQ) + return -EAFNOSUPPORT; + + if (addr->addr.nameseq.type < TIPC_RESERVED_TYPES) + return -EACCES; + + return (addr->scope > 0) ? + tipc_publish(portref, addr->scope, &addr->addr.nameseq) : + tipc_withdraw(portref, -addr->scope, &addr->addr.nameseq); +} + +/** + * 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 + * no write flags + * + * 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; + + poll_wait(file, sk_sleep(sk), wait); + + switch ((int)sock->state) { + 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; +} + +/** + * 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); + struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; + int needs_conn; + long timeout_val; + 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) || + (m->msg_iovlen > (unsigned)INT_MAX)) + 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) || + ((sock->type == SOCK_STREAM) && (total_len != 0))) { + 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); + } + + timeout_val = 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_iovlen, + m->msg_iov, + total_len); + } else if (dest->addrtype == TIPC_ADDR_ID) { + res = tipc_send2port(tport->ref, + &dest->addr.id, + m->msg_iovlen, + 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_iovlen, + m->msg_iov, + total_len); + } + if (likely(res != -ELINKCONG)) { + if (needs_conn && (res >= 0)) + sock->state = SS_CONNECTING; + break; + } + if (timeout_val <= 0L) { + res = timeout_val ? timeout_val : -EWOULDBLOCK; + break; + } + release_sock(sk); + timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk), + !tport->congested, timeout_val); + lock_sock(sk); + } while (1); + +exit: + if (iocb) + release_sock(sk); + return res; +} + +/** + * 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); + struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; + long timeout_val; + int res; + + /* Handle implied connection establishment */ + + if (unlikely(dest)) + return send_msg(iocb, sock, m, total_len); + + if ((total_len > TIPC_MAX_USER_MSG_SIZE) || + (m->msg_iovlen > (unsigned)INT_MAX)) + return -EMSGSIZE; + + if (iocb) + lock_sock(sk); + + timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); + + do { + if (unlikely(sock->state != SS_CONNECTED)) { + if (sock->state == SS_DISCONNECTING) + res = -EPIPE; + else + res = -ENOTCONN; + break; + } + + res = tipc_send(tport->ref, m->msg_iovlen, m->msg_iov, + total_len); + if (likely(res != -ELINKCONG)) + break; + if (timeout_val <= 0L) { + res = timeout_val ? timeout_val : -EWOULDBLOCK; + break; + } + release_sock(sk); + timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk), + (!tport->congested || !tport->connected), timeout_val); + lock_sock(sk); + } while (1); + + 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); + goto exit; + } else if (sock->state == SS_DISCONNECTING) { + res = -EPIPE; + goto exit; + } else { + res = -ENOTCONN; + goto exit; + } + } + + if (unlikely(m->msg_name)) { + res = -EISCONN; + goto exit; + } + + if ((total_len > (unsigned)INT_MAX) || + (m->msg_iovlen > (unsigned)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); + + if (msg_errcode(msg)) { + sock->state = SS_DISCONNECTING; + return -ECONNREFUSED; + } + + tsock->peer_name.ref = msg_origport(msg); + tsock->peer_name.node = msg_orignode(msg); + tipc_connect2port(tsock->p->ref, &tsock->peer_name); + 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 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 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; +} + +/** + * 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 timeout; + 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; + } + + timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); +restart: + + /* Look for a message in receive queue; wait if necessary */ + + while (skb_queue_empty(&sk->sk_receive_queue)) { + if (sock->state == SS_DISCONNECTING) { + res = -ENOTCONN; + goto exit; + } + if (timeout <= 0L) { + res = timeout ? timeout : -EWOULDBLOCK; + goto exit; + } + release_sock(sk); + timeout = wait_event_interruptible_timeout(*sk_sleep(sk), + tipc_rx_ready(sock), + timeout); + lock_sock(sk); + } + + /* 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); + + /* Complete connection setup for an implied connect */ + + if (unlikely(sock->state == SS_CONNECTING)) { + res = auto_connect(sock, msg); + if (res) + goto exit; + } + + /* 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 timeout; + 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) || + (sock->state == SS_CONNECTING))) { + res = -ENOTCONN; + goto exit; + } + + target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); + timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); +restart: + + /* Look for a message in receive queue; wait if necessary */ + + while (skb_queue_empty(&sk->sk_receive_queue)) { + if (sock->state == SS_DISCONNECTING) { + res = -ENOTCONN; + goto exit; + } + if (timeout <= 0L) { + res = timeout ? timeout : -EWOULDBLOCK; + goto exit; + } + release_sock(sk); + timeout = wait_event_interruptible_timeout(*sk_sleep(sk), + tipc_rx_ready(sock), + timeout); + lock_sock(sk); + } + + /* 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; +} + +/** + * rx_queue_full - determine if receive queue can accept another message + * @msg: message to be added to queue + * @queue_size: current size of queue + * @base: nominal maximum size of queue + * + * Returns 1 if queue is unable to accept message, 0 otherwise + */ + +static int rx_queue_full(struct tipc_msg *msg, u32 queue_size, u32 base) +{ + 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; +} + +/** + * 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); + u32 recv_q_len; + + /* 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 + */ + + if (sock->state == SS_READY) { + if (msg_connected(msg)) + return TIPC_ERR_NO_PORT; + } else { + if (msg_mcast(msg)) + return TIPC_ERR_NO_PORT; + if (sock->state == SS_CONNECTED) { + if (!msg_connected(msg)) + return TIPC_ERR_NO_PORT; + } else if (sock->state == SS_CONNECTING) { + if (!msg_connected(msg) && (msg_errcode(msg) == 0)) + return TIPC_ERR_NO_PORT; + } else if (sock->state == SS_LISTENING) { + if (msg_connected(msg) || msg_errcode(msg)) + return TIPC_ERR_NO_PORT; + } else if (sock->state == SS_DISCONNECTING) { + return TIPC_ERR_NO_PORT; + } else /* (sock->state == SS_UNCONNECTED) */ { + if (msg_connected(msg) || msg_errcode(msg)) + return TIPC_ERR_NO_PORT; + } + } + + /* Reject message if there isn't room to queue it */ + + recv_q_len = (u32)atomic_read(&tipc_queue_size); + if (unlikely(recv_q_len >= OVERLOAD_LIMIT_BASE)) { + if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE)) + return TIPC_ERR_OVERLOAD; + } + recv_q_len = skb_queue_len(&sk->sk_receive_queue); + if (unlikely(recv_q_len >= (OVERLOAD_LIMIT_BASE / 2))) { + if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE / 2)) + return TIPC_ERR_OVERLOAD; + } + + /* Enqueue message (finally!) */ + + TIPC_SKB_CB(buf)->handle = 0; + atomic_inc(&tipc_queue_size); + __skb_queue_tail(&sk->sk_receive_queue, buf); + + /* Initiate connection termination for an incoming 'FIN' */ + + if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) { + sock->state = SS_DISCONNECTING; + tipc_disconnect_port(tipc_sk_port(sk)); + } + + if (waitqueue_active(sk_sleep(sk))) + wake_up_interruptible(sk_sleep(sk)); + 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 = (struct sock *)tport->usr_handle; + 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)) + 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 = (struct sock *)tport->usr_handle; + + if (waitqueue_active(sk_sleep(sk))) + wake_up_interruptible(sk_sleep(sk)); +} + +/** + * 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,}; + struct sk_buff *buf; + struct tipc_msg *msg; + unsigned int timeout; + 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; + } + + /* For now, TIPC does not support the non-blocking form of connect() */ + + if (flags & O_NONBLOCK) { + res = -EOPNOTSUPP; + goto exit; + } + + /* Issue Posix-compliant error code if socket is in the wrong state */ + + if (sock->state == SS_LISTENING) { + res = -EOPNOTSUPP; + goto exit; + } + if (sock->state == SS_CONNECTING) { + res = -EALREADY; + goto exit; + } + if (sock->state != SS_UNCONNECTED) { + res = -EISCONN; + 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; + } + + /* Reject any messages already in receive queue (very unlikely) */ + + reject_rx_queue(sk); + + /* Send a 'SYN-' to destination */ + + m.msg_name = dest; + m.msg_namelen = destlen; + res = send_msg(NULL, sock, &m, 0); + if (res < 0) + goto exit; + + /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ + + timeout = tipc_sk(sk)->conn_timeout; + release_sock(sk); + res = wait_event_interruptible_timeout(*sk_sleep(sk), + (!skb_queue_empty(&sk->sk_receive_queue) || + (sock->state != SS_CONNECTING)), + timeout ? (long)msecs_to_jiffies(timeout) + : MAX_SCHEDULE_TIMEOUT); + lock_sock(sk); + + if (res > 0) { + buf = skb_peek(&sk->sk_receive_queue); + if (buf != NULL) { + msg = buf_msg(buf); + res = auto_connect(sock, msg); + if (!res) { + if (!msg_data_sz(msg)) + advance_rx_queue(sk); + } + } else { + if (sock->state == SS_CONNECTED) + res = -EISCONN; + else + res = -ECONNREFUSED; + } + } else { + if (res == 0) + res = -ETIMEDOUT; + else + ; /* leave "res" unchanged */ + sock->state = SS_DISCONNECTING; + } + +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; +} + +/** + * 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 *sk = sock->sk; + struct sk_buff *buf; + int res; + + lock_sock(sk); + + if (sock->state != SS_LISTENING) { + res = -EINVAL; + goto exit; + } + + while (skb_queue_empty(&sk->sk_receive_queue)) { + if (flags & O_NONBLOCK) { + res = -EWOULDBLOCK; + goto exit; + } + release_sock(sk); + res = wait_event_interruptible(*sk_sleep(sk), + (!skb_queue_empty(&sk->sk_receive_queue))); + lock_sock(sk); + if (res) + goto exit; + } + + buf = skb_peek(&sk->sk_receive_queue); + + res = tipc_create(sock_net(sock->sk), new_sock, 0, 0); + if (!res) { + struct sock *new_sk = new_sock->sk; + struct tipc_sock *new_tsock = tipc_sk(new_sk); + struct tipc_port *new_tport = new_tsock->p; + u32 new_ref = new_tport->ref; + struct tipc_msg *msg = buf_msg(buf); + + lock_sock(new_sk); + + /* + * 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_connect2port(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); + } + 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: + + /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ +restart: + buf = __skb_dequeue(&sk->sk_receive_queue); + if (buf) { + atomic_dec(&tipc_queue_size); + if (TIPC_SKB_CB(buf)->handle != 0) { + 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; wake up sleeping tasks */ + + discard_rx_queue(sk); + if (waitqueue_active(sk_sleep(sk))) + wake_up_interruptible(sk_sleep(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 = (u32)atomic_read(&tipc_queue_size); + 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_create +}; + +static struct proto tipc_proto = { + .name = "TIPC", + .owner = THIS_MODULE, + .obj_size = sizeof(struct tipc_sock) +}; + +/** + * 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) { + err("Failed to register TIPC protocol type\n"); + goto out; + } + + res = sock_register(&tipc_family_ops); + if (res) { + err("Failed to register TIPC socket type\n"); + proto_unregister(&tipc_proto); + goto out; + } + + sockets_enabled = 1; + out: + return res; +} + +/** + * tipc_socket_stop - stop TIPC socket interface + */ + +void tipc_socket_stop(void) +{ + if (!sockets_enabled) + return; + + sockets_enabled = 0; + sock_unregister(tipc_family_ops.family); + proto_unregister(&tipc_proto); +} + |