[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/net/tipc/socket.c b/ap/os/linux/linux-3.4.x/net/tipc/socket.c
new file mode 100644
index 0000000..64b8470
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/tipc/socket.c
@@ -0,0 +1,1900 @@
+/*
+ * 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;
+ memset(&addr->addr, 0, sizeof(addr->addr));
+ addr->addr.id.ref = msg_origport(msg);
+ addr->addr.id.node = msg_orignode(msg);
+ addr->addr.name.domain = 0; /* could leave uninitialized */
+ addr->scope = 0; /* could leave uninitialized */
+ m->msg_namelen = sizeof(struct sockaddr_tipc);
+ }
+}
+
+/**
+ * anc_data_recv - optionally capture ancillary data for received message
+ * @m: descriptor for message info
+ * @msg: received message header
+ * @tport: TIPC port associated with message
+ *
+ * Note: Ancillary data is not captured if not requested by receiver.
+ *
+ * Returns 0 if successful, otherwise errno
+ */
+
+static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
+ struct tipc_port *tport)
+{
+ u32 anc_data[3];
+ u32 err;
+ u32 dest_type;
+ int has_name;
+ int res;
+
+ if (likely(m->msg_controllen == 0))
+ return 0;
+
+ /* Optionally capture errored message object(s) */
+
+ err = msg ? msg_errcode(msg) : 0;
+ if (unlikely(err)) {
+ anc_data[0] = err;
+ anc_data[1] = msg_data_sz(msg);
+ res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
+ if (res)
+ return res;
+ if (anc_data[1]) {
+ res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
+ msg_data(msg));
+ if (res)
+ return res;
+ }
+ }
+
+ /* Optionally capture message destination object */
+
+ dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
+ switch (dest_type) {
+ case TIPC_NAMED_MSG:
+ has_name = 1;
+ anc_data[0] = msg_nametype(msg);
+ anc_data[1] = msg_namelower(msg);
+ anc_data[2] = msg_namelower(msg);
+ break;
+ case TIPC_MCAST_MSG:
+ has_name = 1;
+ anc_data[0] = msg_nametype(msg);
+ anc_data[1] = msg_namelower(msg);
+ anc_data[2] = msg_nameupper(msg);
+ break;
+ case TIPC_CONN_MSG:
+ has_name = (tport->conn_type != 0);
+ anc_data[0] = tport->conn_type;
+ anc_data[1] = tport->conn_instance;
+ anc_data[2] = tport->conn_instance;
+ break;
+ default:
+ has_name = 0;
+ }
+ if (has_name) {
+ res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
+ if (res)
+ return res;
+ }
+
+ return 0;
+}
+
+/**
+ * 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);
+}
+