/**
* filter_rcv - validate incoming message
* @sk: socket
* @buf: message
*
* Enqueues message on receive queue if acceptable; optionally handles
* disconnect indication for a connected socket.
*
* Called with socket lock already taken; port lock may also be taken.
*
* Returns TIPC error status code (TIPC_OK if message is not to be rejected)
*/
static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
{
struct socket *sock = sk->sk_socket;
struct tipc_msg *msg = buf_msg(buf);
unsigned int limit = rcvbuf_limit(sk, buf);
u32 res = TIPC_OK;
/* Reject message if it is wrong sort of message for socket */
if (msg_type(msg) > TIPC_DIRECT_MSG)
return TIPC_ERR_NO_PORT;
if (sock->state == SS_READY) {
if (msg_connected(msg))
return TIPC_ERR_NO_PORT;
} else {
res = filter_connect(tipc_sk(sk), &buf);
if (res != TIPC_OK || buf == NULL)
return res;
}
/* Reject message if there isn't room to queue it */
if (sk_rmem_alloc_get(sk) + buf->truesize >= limit)
return TIPC_ERR_OVERLOAD;
/* Enqueue message */
TIPC_SKB_CB(buf)->handle = 0;
__skb_queue_tail(&sk->sk_receive_queue, buf);
skb_set_owner_r(buf, sk);
sk->sk_data_ready(sk, 0);
return TIPC_OK;
}
/**
* tipc_create - create a TIPC socket
* @sock: pre-allocated socket structure
* @protocol: protocol indicator (must be 0)
*
* This routine creates and attaches a 'struct sock' to the 'struct socket',
* then create and attaches a TIPC port to the 'struct sock' part.
*
* Returns 0 on success, errno otherwise
*/
static int tipc_create(struct socket *sock, int protocol)
{
struct tipc_sock *tsock;
struct tipc_port *port;
struct sock *sk;
u32 ref;
if (unlikely(protocol != 0))
return -EPROTONOSUPPORT;
ref = tipc_createport_raw(NULL, &dispatch, &wakeupdispatch, TIPC_LOW_IMPORTANCE);
if (unlikely(!ref))
return -ENOMEM;
sock->state = SS_UNCONNECTED;
switch (sock->type) {
case SOCK_STREAM:
sock->ops = &stream_ops;
break;
case SOCK_SEQPACKET:
sock->ops = &packet_ops;
break;
case SOCK_DGRAM:
tipc_set_portunreliable(ref, 1);
/* fall through */
case SOCK_RDM:
tipc_set_portunreturnable(ref, 1);
sock->ops = &msg_ops;
sock->state = SS_READY;
break;
default:
tipc_deleteport(ref);
return -EPROTOTYPE;
}
sk = sk_alloc(AF_TIPC, GFP_KERNEL, &tipc_proto, 1);
if (!sk) {
tipc_deleteport(ref);
return -ENOMEM;
}
sock_init_data(sock, sk);
init_waitqueue_head(sk->sk_sleep);
sk->sk_rcvtimeo = 8 * HZ; /* default connect timeout = 8s */
tsock = tipc_sk(sk);
port = tipc_get_port(ref);
tsock->p = port;
port->usr_handle = tsock;
init_MUTEX(&tsock->sem);
dbg("sock_create: %x\n",tsock);
atomic_inc(&tipc_user_count);
return 0;
}
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;
}
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;
if ((res = get_user(len, ol)))
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 = jiffies_to_msecs(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) {
/* "get" failed */
}
else if (len < sizeof(value)) {
res = -EINVAL;
}
else if (copy_to_user(ov, &value, sizeof(value))) {
res = -EFAULT;
}
else {
res = put_user(sizeof(value), ol);
}
return res;
}
static int release(struct socket *sock)
{
struct tipc_sock *tsock = tipc_sk(sock->sk);
struct sock *sk = sock->sk;
int res = TIPC_OK;
struct sk_buff *buf;
dbg("sock_delete: %x\n",tsock);
if (!tsock)
return 0;
down_interruptible(&tsock->sem);
if (!sock->sk) {
up(&tsock->sem);
return 0;
}
/* Reject unreceived messages, unless no longer connected */
while (sock->state != SS_DISCONNECTING) {
sock_lock(tsock);
buf = skb_dequeue(&sk->sk_receive_queue);
if (!buf)
tsock->p->usr_handle = NULL;
sock_unlock(tsock);
if (!buf)
break;
if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf)))
buf_discard(buf);
else
tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
atomic_dec(&tipc_queue_size);
}
/* Delete TIPC port */
res = tipc_deleteport(tsock->p->ref);
sock->sk = NULL;
/* Discard any remaining messages */
while ((buf = skb_dequeue(&sk->sk_receive_queue))) {
buf_discard(buf);
atomic_dec(&tipc_queue_size);
}
up(&tsock->sem);
sock_put(sk);
atomic_dec(&tipc_user_count);
return res;
}
static int getsockopt(struct socket *sock,
int lvl, int opt, char __user *ov, int __user *ol)
{
struct tipc_sock *tsock = tipc_sk(sock->sk);
int len;
u32 value;
int res;
if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
return put_user(0, ol);
if (lvl != SOL_TIPC)
return -ENOPROTOOPT;
if ((res = get_user(len, ol)))
return res;
if (down_interruptible(&tsock->sem))
return -ERESTARTSYS;
switch (opt) {
case TIPC_IMPORTANCE:
res = tipc_portimportance(tsock->p->ref, &value);
break;
case TIPC_SRC_DROPPABLE:
res = tipc_portunreliable(tsock->p->ref, &value);
break;
case TIPC_DEST_DROPPABLE:
res = tipc_portunreturnable(tsock->p->ref, &value);
break;
case TIPC_CONN_TIMEOUT:
value = (sock->sk->sk_rcvtimeo * 1000) / HZ;
break;
default:
res = -EINVAL;
}
if (res) {
/* "get" failed */
}
else if (len < sizeof(value)) {
res = -EINVAL;
}
else if ((res = copy_to_user(ov, &value, sizeof(value)))) {
/* couldn't return value */
}
else {
res = put_user(sizeof(value), ol);
}
up(&tsock->sem);
return res;
}
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;
}
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;
}
/**
* auto_connect - complete connection setup to a remote port
* @sock: socket structure
* @msg: peer's response message
*
* Returns 0 on success, errno otherwise
*/
static int auto_connect(struct socket *sock, struct tipc_msg *msg)
{
struct tipc_sock *tsock = tipc_sk(sock->sk);
struct tipc_port *p_ptr;
tsock->peer_name.ref = msg_origport(msg);
tsock->peer_name.node = msg_orignode(msg);
p_ptr = tipc_port_deref(tsock->p->ref);
if (!p_ptr)
return -EINVAL;
__tipc_connect(tsock->p->ref, p_ptr, &tsock->peer_name);
if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)
return -EINVAL;
msg_set_importance(&p_ptr->phdr, (u32)msg_importance(msg));
sock->state = SS_CONNECTED;
return 0;
}
static int setsockopt(struct socket *sock,
int lvl, int opt, char __user *ov, int ol)
{
struct tipc_sock *tsock = tipc_sk(sock->sk);
u32 value;
int res;
if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
return 0;
if (lvl != SOL_TIPC)
return -ENOPROTOOPT;
if (ol < sizeof(value))
return -EINVAL;
if ((res = get_user(value, (u32 __user *)ov)))
return res;
if (down_interruptible(&tsock->sem))
return -ERESTARTSYS;
switch (opt) {
case TIPC_IMPORTANCE:
res = tipc_set_portimportance(tsock->p->ref, value);
break;
case TIPC_SRC_DROPPABLE:
if (sock->type != SOCK_STREAM)
res = tipc_set_portunreliable(tsock->p->ref, value);
else
res = -ENOPROTOOPT;
break;
case TIPC_DEST_DROPPABLE:
res = tipc_set_portunreturnable(tsock->p->ref, value);
break;
case TIPC_CONN_TIMEOUT:
sock->sk->sk_rcvtimeo = (value * HZ / 1000);
break;
default:
res = -EINVAL;
}
up(&tsock->sem);
return res;
}
static int send_packet(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t total_len)
{
struct tipc_sock *tsock = tipc_sk(sock->sk);
struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
int res;
/* Handle implied connection establishment */
if (unlikely(dest))
return send_msg(iocb, sock, m, total_len);
if (down_interruptible(&tsock->sem)) {
return -ERESTARTSYS;
}
do {
if (unlikely(sock->state != SS_CONNECTED)) {
if (sock->state == SS_DISCONNECTING)
res = -EPIPE;
else
res = -ENOTCONN;
goto exit;
}
res = tipc_send(tsock->p->ref, m->msg_iovlen, m->msg_iov);
if (likely(res != -ELINKCONG)) {
exit:
up(&tsock->sem);
return res;
}
if (m->msg_flags & MSG_DONTWAIT) {
res = -EWOULDBLOCK;
goto exit;
}
if (wait_event_interruptible(*sock->sk->sk_sleep,
!tsock->p->congested)) {
res = -ERESTARTSYS;
goto exit;
}
} while (1);
}
static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len)
{
struct tipc_sock *tsock = tipc_sk(sock->sk);
struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
int res;
if (down_interruptible(&tsock->sem))
return -ERESTARTSYS;
if (unlikely(!uaddr_len)) {
res = tipc_withdraw(tsock->p->ref, 0, NULL);
goto exit;
}
if (uaddr_len < sizeof(struct sockaddr_tipc)) {
res = -EINVAL;
goto exit;
}
if (addr->family != AF_TIPC) {
res = -EAFNOSUPPORT;
goto exit;
}
if (addr->addrtype == TIPC_ADDR_NAME)
addr->addr.nameseq.upper = addr->addr.nameseq.lower;
else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
res = -EAFNOSUPPORT;
goto exit;
}
if (addr->scope > 0)
res = tipc_publish(tsock->p->ref, addr->scope,
&addr->addr.nameseq);
else
res = tipc_withdraw(tsock->p->ref, -addr->scope,
&addr->addr.nameseq);
exit:
up(&tsock->sem);
return res;
}
static int get_name(struct socket *sock, struct sockaddr *uaddr,
int *uaddr_len, int peer)
{
struct tipc_sock *tsock = tipc_sk(sock->sk);
struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
u32 res;
if (down_interruptible(&tsock->sem))
return -ERESTARTSYS;
*uaddr_len = sizeof(*addr);
addr->addrtype = TIPC_ADDR_ID;
addr->family = AF_TIPC;
addr->scope = 0;
if (peer)
res = tipc_peer(tsock->p->ref, &addr->addr.id);
else
res = tipc_ownidentity(tsock->p->ref, &addr->addr.id);
addr->addr.name.domain = 0;
up(&tsock->sem);
return res;
}
static int connect(struct socket *sock, struct sockaddr *dest, int destlen,
int flags)
{
struct tipc_sock *tsock = tipc_sk(sock->sk);
struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
struct msghdr m = {0,};
struct sk_buff *buf;
struct tipc_msg *msg;
int res;
/* For now, TIPC does not allow use of connect() with DGRAM or RDM types */
if (sock->state == SS_READY)
return -EOPNOTSUPP;
/* MOVE THE REST OF THIS ERROR CHECKING TO send_msg()? */
if (sock->state == SS_LISTENING)
return -EOPNOTSUPP;
if (sock->state == SS_CONNECTING)
return -EALREADY;
if (sock->state != SS_UNCONNECTED)
return -EISCONN;
if ((dst->family != AF_TIPC) ||
((dst->addrtype != TIPC_ADDR_NAME) && (dst->addrtype != TIPC_ADDR_ID)))
return -EINVAL;
/* Send a 'SYN-' to destination */
m.msg_name = dest;
if ((res = send_msg(0, sock, &m, 0)) < 0) {
sock->state = SS_DISCONNECTING;
return res;
}
if (down_interruptible(&tsock->sem))
return -ERESTARTSYS;
/* Wait for destination's 'ACK' response */
res = wait_event_interruptible_timeout(*sock->sk->sk_sleep,
skb_queue_len(&sock->sk->sk_receive_queue),
sock->sk->sk_rcvtimeo);
buf = skb_peek(&sock->sk->sk_receive_queue);
if (res > 0) {
msg = buf_msg(buf);
res = auto_connect(sock, tsock, msg);
if (!res) {
if (dst->addrtype == TIPC_ADDR_NAME) {
tsock->p->conn_type = dst->addr.name.name.type;
tsock->p->conn_instance = dst->addr.name.name.instance;
}
if (!msg_data_sz(msg))
advance_queue(tsock);
}
} else {
if (res == 0) {
res = -ETIMEDOUT;
} else
{ /* leave "res" unchanged */ }
sock->state = SS_DISCONNECTING;
}
up(&tsock->sem);
return res;
}
static int connect(struct socket *sock, struct sockaddr *dest, int destlen,
int flags)
{
struct tipc_sock *tsock = tipc_sk(sock->sk);
struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
struct msghdr m = {NULL,};
struct sk_buff *buf;
struct tipc_msg *msg;
int res;
/* For now, TIPC does not allow use of connect() with DGRAM or RDM types */
if (sock->state == SS_READY)
return -EOPNOTSUPP;
/* Issue Posix-compliant error code if socket is in the wrong state */
if (sock->state == SS_LISTENING)
return -EOPNOTSUPP;
if (sock->state == SS_CONNECTING)
return -EALREADY;
if (sock->state != SS_UNCONNECTED)
return -EISCONN;
/*
* 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)
return -EINVAL;
/* Send a 'SYN-' to destination */
m.msg_name = dest;
m.msg_namelen = destlen;
if ((res = send_msg(NULL, sock, &m, 0)) < 0) {
sock->state = SS_DISCONNECTING;
return res;
}
if (down_interruptible(&tsock->sem))
return -ERESTARTSYS;
/* Wait for destination's 'ACK' response */
res = wait_event_interruptible_timeout(*sock->sk->sk_sleep,
skb_queue_len(&sock->sk->sk_receive_queue),
sock->sk->sk_rcvtimeo);
buf = skb_peek(&sock->sk->sk_receive_queue);
if (res > 0) {
msg = buf_msg(buf);
res = auto_connect(sock, tsock, msg);
if (!res) {
if (!msg_data_sz(msg))
advance_queue(tsock);
}
} else {
if (res == 0) {
res = -ETIMEDOUT;
} else
{ /* leave "res" unchanged */ }
sock->state = SS_DISCONNECTING;
}
up(&tsock->sem);
return res;
}
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;
}
static int accept(struct socket *sock, struct socket *newsock, int flags)
{
struct tipc_sock *tsock = tipc_sk(sock->sk);
struct sk_buff *buf;
int res = -EFAULT;
if (sock->state == SS_READY)
return -EOPNOTSUPP;
if (sock->state != SS_LISTENING)
return -EINVAL;
if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) &&
(flags & O_NONBLOCK)))
return -EWOULDBLOCK;
if (down_interruptible(&tsock->sem))
return -ERESTARTSYS;
if (wait_event_interruptible(*sock->sk->sk_sleep,
skb_queue_len(&sock->sk->sk_receive_queue))) {
res = -ERESTARTSYS;
goto exit;
}
buf = skb_peek(&sock->sk->sk_receive_queue);
res = tipc_create(newsock, 0);
if (!res) {
struct tipc_sock *new_tsock = tipc_sk(newsock->sk);
struct tipc_portid id;
struct tipc_msg *msg = buf_msg(buf);
u32 new_ref = new_tsock->p->ref;
id.ref = msg_origport(msg);
id.node = msg_orignode(msg);
tipc_connect2port(new_ref, &id);
newsock->state = SS_CONNECTED;
tipc_set_portimportance(new_ref, msg_importance(msg));
if (msg_named(msg)) {
new_tsock->p->conn_type = msg_nametype(msg);
new_tsock->p->conn_instance = msg_nameinst(msg);
}
/*
* Respond to 'SYN-' by discarding it & returning 'ACK'-.
* Respond to 'SYN+' by queuing it on new socket.
*/
msg_dbg(msg,"<ACC<: ");
if (!msg_data_sz(msg)) {
struct msghdr m = {NULL,};
send_packet(NULL, newsock, &m, 0);
advance_queue(tsock);
} else {
sock_lock(tsock);
skb_dequeue(&sock->sk->sk_receive_queue);
sock_unlock(tsock);
skb_queue_head(&newsock->sk->sk_receive_queue, buf);
}
}
exit:
up(&tsock->sem);
return res;
}
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;
}
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;
}
static int shutdown(struct socket *sock, int how)
{
struct tipc_sock* tsock = tipc_sk(sock->sk);
struct sk_buff *buf;
int res;
/* Could return -EINVAL for an invalid "how", but why bother? */
if (down_interruptible(&tsock->sem))
return -ERESTARTSYS;
sock_lock(tsock);
switch (sock->state) {
case SS_CONNECTED:
/* Send 'FIN+' or 'FIN-' message to peer */
sock_unlock(tsock);
restart:
if ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) {
atomic_dec(&tipc_queue_size);
if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) {
buf_discard(buf);
goto restart;
}
tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
}
else {
tipc_shutdown(tsock->p->ref);
}
sock_lock(tsock);
/* fall through */
case SS_DISCONNECTING:
/* Discard any unreceived messages */
while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) {
atomic_dec(&tipc_queue_size);
buf_discard(buf);
}
tsock->p->conn_unacked = 0;
/* fall through */
case SS_CONNECTING:
sock->state = SS_DISCONNECTING;
res = 0;
break;
default:
res = -ENOTCONN;
}
sock_unlock(tsock);
up(&tsock->sem);
return res;
}
/**
* 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,};
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;
}
/*
* 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;
}
timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout;
switch (sock->state) {
case SS_UNCONNECTED:
/* Send a 'SYN-' to destination */
m.msg_name = dest;
m.msg_namelen = destlen;
/* If connect is in non-blocking case, set MSG_DONTWAIT to
* indicate send_msg() is never blocked.
*/
if (!timeout)
m.msg_flags = MSG_DONTWAIT;
res = send_msg(NULL, sock, &m, 0);
if ((res < 0) && (res != -EWOULDBLOCK))
goto exit;
/* Just entered SS_CONNECTING state; the only
* difference is that return value in non-blocking
* case is EINPROGRESS, rather than EALREADY.
*/
res = -EINPROGRESS;
break;
case SS_CONNECTING:
res = -EALREADY;
break;
case SS_CONNECTED:
res = -EISCONN;
break;
default:
res = -EINVAL;
goto exit;
}
if (sock->state == SS_CONNECTING) {
if (!timeout)
goto exit;
/* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
release_sock(sk);
res = wait_event_interruptible_timeout(*sk_sleep(sk),
sock->state != SS_CONNECTING,
timeout ? (long)msecs_to_jiffies(timeout)
: MAX_SCHEDULE_TIMEOUT);
lock_sock(sk);
if (res <= 0) {
if (res == 0)
res = -ETIMEDOUT;
else
; /* leave "res" unchanged */
goto exit;
}
}
if (unlikely(sock->state == SS_DISCONNECTING))
res = sock_error(sk);
else
res = 0;
exit:
release_sock(sk);
return res;
}
static int recv_stream(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t buf_len, int flags)
{
struct tipc_sock *tsock = tipc_sk(sock->sk);
struct sk_buff *buf;
struct tipc_msg *msg;
unsigned int q_len;
unsigned int sz;
int sz_to_copy;
int sz_copied = 0;
int needed;
char __user *crs = m->msg_iov->iov_base;
unsigned char *buf_crs;
u32 err;
int res;
/* Currently doesn't support receiving into multiple iovec entries */
if (m->msg_iovlen != 1)
return -EOPNOTSUPP;
/* Catch invalid receive attempts */
if (unlikely(!buf_len))
return -EINVAL;
if (unlikely(sock->state == SS_DISCONNECTING)) {
if (skb_queue_len(&sock->sk->sk_receive_queue) == 0)
return -ENOTCONN;
} else if (unlikely(sock->state != SS_CONNECTED))
return -ENOTCONN;
/* Look for a message in receive queue; wait if necessary */
if (unlikely(down_interruptible(&tsock->sem)))
return -ERESTARTSYS;
restart:
if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) &&
(flags & MSG_DONTWAIT))) {
res = -EWOULDBLOCK;
goto exit;
}
if ((res = wait_event_interruptible(
*sock->sk->sk_sleep,
((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) ||
(sock->state == SS_DISCONNECTING))) )) {
goto exit;
}
/* Catch attempt to receive on an already terminated connection */
/* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */
if (!q_len) {
res = -ENOTCONN;
goto exit;
}
/* Get access to first message in receive queue */
buf = skb_peek(&sock->sk->sk_receive_queue);
msg = buf_msg(buf);
sz = msg_data_sz(msg);
err = msg_errcode(msg);
/* Discard an empty non-errored message & try again */
if ((!sz) && (!err)) {
advance_queue(tsock);
goto restart;
}
/* Optionally capture sender's address & ancillary data of first msg */
if (sz_copied == 0) {
set_orig_addr(m, msg);
if ((res = anc_data_recv(m, msg, tsock->p)))
goto exit;
}
/* Capture message data (if valid) & compute return value (always) */
if (!err) {
buf_crs = (unsigned char *)(TIPC_SKB_CB(buf)->handle);
sz = skb_tail_pointer(buf) - buf_crs;
needed = (buf_len - sz_copied);
sz_to_copy = (sz <= needed) ? sz : needed;
if (unlikely(copy_to_user(crs, buf_crs, sz_to_copy))) {
res = -EFAULT;
goto exit;
}
sz_copied += sz_to_copy;
if (sz_to_copy < sz) {
if (!(flags & MSG_PEEK))
TIPC_SKB_CB(buf)->handle = buf_crs + sz_to_copy;
goto exit;
}
crs += sz_to_copy;
} else {
if (sz_copied != 0)
goto exit; /* can't add error msg to valid data */
if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
res = 0;
else
res = -ECONNRESET;
}
/* Consume received message (optional) */
if (likely(!(flags & MSG_PEEK))) {
if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked);
advance_queue(tsock);
}
/* Loop around if more data is required */
if ((sz_copied < buf_len) /* didn't get all requested data */
&& (flags & MSG_WAITALL) /* ... and need to wait for more */
&& (!(flags & MSG_PEEK)) /* ... and aren't just peeking at data */
&& (!err) /* ... and haven't reached a FIN */
)
goto restart;
exit:
up(&tsock->sem);
return sz_copied ? sz_copied : res;
}
static int recv_msg(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t buf_len, int flags)
{
struct tipc_sock *tsock = tipc_sk(sock->sk);
struct sk_buff *buf;
struct tipc_msg *msg;
unsigned int q_len;
unsigned int sz;
u32 err;
int res;
/* Currently doesn't support receiving into multiple iovec entries */
if (m->msg_iovlen != 1)
return -EOPNOTSUPP;
/* Catch invalid receive attempts */
if (unlikely(!buf_len))
return -EINVAL;
if (sock->type == SOCK_SEQPACKET) {
if (unlikely(sock->state == SS_UNCONNECTED))
return -ENOTCONN;
if (unlikely((sock->state == SS_DISCONNECTING) &&
(skb_queue_len(&sock->sk->sk_receive_queue) == 0)))
return -ENOTCONN;
}
/* Look for a message in receive queue; wait if necessary */
if (unlikely(down_interruptible(&tsock->sem)))
return -ERESTARTSYS;
restart:
if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) &&
(flags & MSG_DONTWAIT))) {
res = -EWOULDBLOCK;
goto exit;
}
if ((res = wait_event_interruptible(
*sock->sk->sk_sleep,
((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) ||
(sock->state == SS_DISCONNECTING))) )) {
goto exit;
}
/* Catch attempt to receive on an already terminated connection */
/* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */
if (!q_len) {
res = -ENOTCONN;
goto exit;
}
/* Get access to first message in receive queue */
buf = skb_peek(&sock->sk->sk_receive_queue);
msg = buf_msg(buf);
sz = msg_data_sz(msg);
err = msg_errcode(msg);
/* Complete connection setup for an implied connect */
if (unlikely(sock->state == SS_CONNECTING)) {
if ((res = auto_connect(sock, tsock, msg)))
goto exit;
}
/* Discard an empty non-errored message & try again */
if ((!sz) && (!err)) {
advance_queue(tsock);
goto restart;
}
/* Capture sender's address (optional) */
set_orig_addr(m, msg);
/* Capture ancillary data (optional) */
if ((res = anc_data_recv(m, msg, tsock->p)))
goto exit;
/* Capture message data (if valid) & compute return value (always) */
if (!err) {
if (unlikely(buf_len < sz)) {
sz = buf_len;
m->msg_flags |= MSG_TRUNC;
}
if (unlikely(copy_to_user(m->msg_iov->iov_base, msg_data(msg),
sz))) {
res = -EFAULT;
goto exit;
}
res = sz;
} else {
if ((sock->state == SS_READY) ||
((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
res = 0;
else
res = -ECONNRESET;
}
/* Consume received message (optional) */
if (likely(!(flags & MSG_PEEK))) {
if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked);
advance_queue(tsock);
}
exit:
up(&tsock->sem);
return res;
}
static int send_stream(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t total_len)
{
struct tipc_port *tport;
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;
/* Handle special cases where there is no connection */
if (unlikely(sock->state != SS_CONNECTED)) {
if (sock->state == SS_UNCONNECTED)
return send_packet(iocb, sock, m, total_len);
else if (sock->state == SS_DISCONNECTING)
return -EPIPE;
else
return -ENOTCONN;
}
if (unlikely(m->msg_name))
return -EISCONN;
/*
* 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;
tport = tipc_sk(sock->sk)->p;
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;
if ((res = send_packet(iocb, sock, &my_msg, 0)) < 0) {
if (bytes_sent != 0)
res = bytes_sent;
return res;
}
curr_left -= bytes_to_send;
curr_start += bytes_to_send;
bytes_sent += bytes_to_send;
}
curr_iov++;
}
return bytes_sent;
}
static int send_msg(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t total_len)
{
struct tipc_sock *tsock = tipc_sk(sock->sk);
struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
struct sk_buff *buf;
int needs_conn;
int res = -EINVAL;
if (unlikely(!dest))
return -EDESTADDRREQ;
if (unlikely((m->msg_namelen < sizeof(*dest)) ||
(dest->family != AF_TIPC)))
return -EINVAL;
needs_conn = (sock->state != SS_READY);
if (unlikely(needs_conn)) {
if (sock->state == SS_LISTENING)
return -EPIPE;
if (sock->state != SS_UNCONNECTED)
return -EISCONN;
if ((tsock->p->published) ||
((sock->type == SOCK_STREAM) && (total_len != 0)))
return -EOPNOTSUPP;
if (dest->addrtype == TIPC_ADDR_NAME) {
tsock->p->conn_type = dest->addr.name.name.type;
tsock->p->conn_instance = dest->addr.name.name.instance;
}
}
if (down_interruptible(&tsock->sem))
return -ERESTARTSYS;
if (needs_conn) {
/* Abort any pending connection attempts (very unlikely) */
while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) {
tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
atomic_dec(&tipc_queue_size);
}
sock->state = SS_CONNECTING;
}
do {
if (dest->addrtype == TIPC_ADDR_NAME) {
if ((res = dest_name_check(dest, m)))
goto exit;
res = tipc_send2name(tsock->p->ref,
&dest->addr.name.name,
dest->addr.name.domain,
m->msg_iovlen,
m->msg_iov);
}
else if (dest->addrtype == TIPC_ADDR_ID) {
res = tipc_send2port(tsock->p->ref,
&dest->addr.id,
m->msg_iovlen,
m->msg_iov);
}
else if (dest->addrtype == TIPC_ADDR_MCAST) {
if (needs_conn) {
res = -EOPNOTSUPP;
goto exit;
}
if ((res = dest_name_check(dest, m)))
goto exit;
res = tipc_multicast(tsock->p->ref,
&dest->addr.nameseq,
0,
m->msg_iovlen,
m->msg_iov);
}
if (likely(res != -ELINKCONG)) {
exit:
up(&tsock->sem);
return res;
}
if (m->msg_flags & MSG_DONTWAIT) {
res = -EWOULDBLOCK;
goto exit;
}
if (wait_event_interruptible(*sock->sk->sk_sleep,
!tsock->p->congested)) {
res = -ERESTARTSYS;
goto exit;
}
} while (1);
}
