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PL286/kernel-3.18/net/tipc/socket.c

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/*
* net/tipc/socket.c: TIPC socket API
*
* Copyright (c) 2001-2007, 2012-2014, Ericsson AB
* Copyright (c) 2004-2008, 2010-2013, Wind River Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "core.h"
#include "name_table.h"
#include "node.h"
#include "link.h"
#include <linux/export.h>
#include "config.h"
#include "socket.h"
#define SS_LISTENING -1 /* socket is listening */
#define SS_READY -2 /* socket is connectionless */
#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
#define CONN_PROBING_INTERVAL 3600000 /* [ms] => 1 h */
#define TIPC_FWD_MSG 1
#define TIPC_CONN_OK 0
#define TIPC_CONN_PROBING 1
/**
* struct tipc_sock - TIPC socket structure
* @sk: socket - interacts with 'port' and with user via the socket API
* @connected: non-zero if port is currently connected to a peer port
* @conn_type: TIPC type used when connection was established
* @conn_instance: TIPC instance used when connection was established
* @published: non-zero if port has one or more associated names
* @max_pkt: maximum packet size "hint" used when building messages sent by port
* @ref: unique reference to port in TIPC object registry
* @phdr: preformatted message header used when sending messages
* @port_list: adjacent ports in TIPC's global list of ports
* @publications: list of publications for port
* @pub_count: total # of publications port has made during its lifetime
* @probing_state:
* @probing_interval:
* @timer:
* @port: port - interacts with 'sk' and with the rest of the TIPC stack
* @peer_name: the peer of the connection, if any
* @conn_timeout: the time we can wait for an unresponded setup request
* @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
* @link_cong: non-zero if owner must sleep because of link congestion
* @sent_unacked: # messages sent by socket, and not yet acked by peer
* @rcv_unacked: # messages read by user, but not yet acked back to peer
*/
struct tipc_sock {
struct sock sk;
int connected;
u32 conn_type;
u32 conn_instance;
int published;
u32 max_pkt;
u32 ref;
struct tipc_msg phdr;
struct list_head sock_list;
struct list_head publications;
u32 pub_count;
u32 probing_state;
u32 probing_interval;
struct timer_list timer;
uint conn_timeout;
atomic_t dupl_rcvcnt;
bool link_cong;
uint sent_unacked;
uint rcv_unacked;
};
static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb);
static void tipc_data_ready(struct sock *sk);
static void tipc_write_space(struct sock *sk);
static int tipc_release(struct socket *sock);
static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags);
static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p);
static void tipc_sk_timeout(unsigned long ref);
static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
struct tipc_name_seq const *seq);
static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
struct tipc_name_seq const *seq);
static u32 tipc_sk_ref_acquire(struct tipc_sock *tsk);
static void tipc_sk_ref_discard(u32 ref);
static struct tipc_sock *tipc_sk_get(u32 ref);
static struct tipc_sock *tipc_sk_get_next(u32 *ref);
static void tipc_sk_put(struct tipc_sock *tsk);
static const struct proto_ops packet_ops;
static const struct proto_ops stream_ops;
static const struct proto_ops msg_ops;
static struct proto tipc_proto;
static struct proto tipc_proto_kern;
/*
* Revised TIPC socket locking policy:
*
* Most socket operations take the standard socket lock when they start
* and hold it until they finish (or until they need to sleep). Acquiring
* this lock grants the owner exclusive access to the fields of the socket
* data structures, with the exception of the backlog queue. A few socket
* operations can be done without taking the socket lock because they only
* read socket information that never changes during the life of the socket.
*
* Socket operations may acquire the lock for the associated TIPC port if they
* need to perform an operation on the port. If any routine needs to acquire
* both the socket lock and the port lock it must take the socket lock first
* to avoid the risk of deadlock.
*
* The dispatcher handling incoming messages cannot grab the socket lock in
* the standard fashion, since invoked it runs at the BH level and cannot block.
* Instead, it checks to see if the socket lock is currently owned by someone,
* and either handles the message itself or adds it to the socket's backlog
* queue; in the latter case the queued message is processed once the process
* owning the socket lock releases it.
*
* NOTE: Releasing the socket lock while an operation is sleeping overcomes
* the problem of a blocked socket operation preventing any other operations
* from occurring. However, applications must be careful if they have
* multiple threads trying to send (or receive) on the same socket, as these
* operations might interfere with each other. For example, doing a connect
* and a receive at the same time might allow the receive to consume the
* ACK message meant for the connect. While additional work could be done
* to try and overcome this, it doesn't seem to be worthwhile at the present.
*
* NOTE: Releasing the socket lock while an operation is sleeping also ensures
* that another operation that must be performed in a non-blocking manner is
* not delayed for very long because the lock has already been taken.
*
* NOTE: This code assumes that certain fields of a port/socket pair are
* constant over its lifetime; such fields can be examined without taking
* the socket lock and/or port lock, and do not need to be re-read even
* after resuming processing after waiting. These fields include:
* - socket type
* - pointer to socket sk structure (aka tipc_sock structure)
* - pointer to port structure
* - port reference
*/
static u32 tsk_peer_node(struct tipc_sock *tsk)
{
return msg_destnode(&tsk->phdr);
}
static u32 tsk_peer_port(struct tipc_sock *tsk)
{
return msg_destport(&tsk->phdr);
}
static bool tsk_unreliable(struct tipc_sock *tsk)
{
return msg_src_droppable(&tsk->phdr) != 0;
}
static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
{
msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
}
static bool tsk_unreturnable(struct tipc_sock *tsk)
{
return msg_dest_droppable(&tsk->phdr) != 0;
}
static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
{
msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
}
static int tsk_importance(struct tipc_sock *tsk)
{
return msg_importance(&tsk->phdr);
}
static int tsk_set_importance(struct tipc_sock *tsk, int imp)
{
if (imp > TIPC_CRITICAL_IMPORTANCE)
return -EINVAL;
msg_set_importance(&tsk->phdr, (u32)imp);
return 0;
}
static struct tipc_sock *tipc_sk(const struct sock *sk)
{
return container_of(sk, struct tipc_sock, sk);
}
static int tsk_conn_cong(struct tipc_sock *tsk)
{
return tsk->sent_unacked >= TIPC_FLOWCTRL_WIN;
}
/**
* tsk_advance_rx_queue - discard first buffer in socket receive queue
*
* Caller must hold socket lock
*/
static void tsk_advance_rx_queue(struct sock *sk)
{
kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
}
/**
* tsk_rej_rx_queue - reject all buffers in socket receive queue
*
* Caller must hold socket lock
*/
static void tsk_rej_rx_queue(struct sock *sk)
{
struct sk_buff *buf;
u32 dnode;
while ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT))
tipc_link_xmit(buf, dnode, 0);
}
}
/* tsk_peer_msg - verify if message was sent by connected port's peer
*
* Handles cases where the node's network address has changed from
* the default of <0.0.0> to its configured setting.
*/
static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
{
u32 peer_port = tsk_peer_port(tsk);
u32 orig_node;
u32 peer_node;
if (unlikely(!tsk->connected))
return false;
if (unlikely(msg_origport(msg) != peer_port))
return false;
orig_node = msg_orignode(msg);
peer_node = tsk_peer_node(tsk);
if (likely(orig_node == peer_node))
return true;
if (!orig_node && (peer_node == tipc_own_addr))
return true;
if (!peer_node && (orig_node == tipc_own_addr))
return true;
return false;
}
/**
* tipc_sk_create - create a TIPC socket
* @net: network namespace (must be default network)
* @sock: pre-allocated socket structure
* @protocol: protocol indicator (must be 0)
* @kern: caused by kernel or by userspace?
*
* This routine creates additional data structures used by the TIPC socket,
* initializes them, and links them together.
*
* Returns 0 on success, errno otherwise
*/
static int tipc_sk_create(struct net *net, struct socket *sock,
int protocol, int kern)
{
const struct proto_ops *ops;
socket_state state;
struct sock *sk;
struct tipc_sock *tsk;
struct tipc_msg *msg;
u32 ref;
/* Validate arguments */
if (unlikely(protocol != 0))
return -EPROTONOSUPPORT;
switch (sock->type) {
case SOCK_STREAM:
ops = &stream_ops;
state = SS_UNCONNECTED;
break;
case SOCK_SEQPACKET:
ops = &packet_ops;
state = SS_UNCONNECTED;
break;
case SOCK_DGRAM:
case SOCK_RDM:
ops = &msg_ops;
state = SS_READY;
break;
default:
return -EPROTOTYPE;
}
/* Allocate socket's protocol area */
if (!kern)
sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
else
sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern);
if (sk == NULL)
return -ENOMEM;
tsk = tipc_sk(sk);
ref = tipc_sk_ref_acquire(tsk);
if (!ref) {
pr_warn("Socket create failed; reference table exhausted\n");
return -ENOMEM;
}
tsk->max_pkt = MAX_PKT_DEFAULT;
tsk->ref = ref;
INIT_LIST_HEAD(&tsk->publications);
msg = &tsk->phdr;
tipc_msg_init(msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG,
NAMED_H_SIZE, 0);
msg_set_origport(msg, ref);
/* Finish initializing socket data structures */
sock->ops = ops;
sock->state = state;
sock_init_data(sock, sk);
k_init_timer(&tsk->timer, (Handler)tipc_sk_timeout, ref);
sk->sk_backlog_rcv = tipc_backlog_rcv;
sk->sk_rcvbuf = sysctl_tipc_rmem[1];
sk->sk_data_ready = tipc_data_ready;
sk->sk_write_space = tipc_write_space;
tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
tsk->sent_unacked = 0;
atomic_set(&tsk->dupl_rcvcnt, 0);
if (sock->state == SS_READY) {
tsk_set_unreturnable(tsk, true);
if (sock->type == SOCK_DGRAM)
tsk_set_unreliable(tsk, true);
}
return 0;
}
/**
* tipc_sock_create_local - create TIPC socket from inside TIPC module
* @type: socket type - SOCK_RDM or SOCK_SEQPACKET
*
* We cannot use sock_creat_kern here because it bumps module user count.
* Since socket owner and creator is the same module we must make sure
* that module count remains zero for module local sockets, otherwise
* we cannot do rmmod.
*
* Returns 0 on success, errno otherwise
*/
int tipc_sock_create_local(int type, struct socket **res)
{
int rc;
rc = sock_create_lite(AF_TIPC, type, 0, res);
if (rc < 0) {
pr_err("Failed to create kernel socket\n");
return rc;
}
tipc_sk_create(&init_net, *res, 0, 1);
return 0;
}
/**
* tipc_sock_release_local - release socket created by tipc_sock_create_local
* @sock: the socket to be released.
*
* Module reference count is not incremented when such sockets are created,
* so we must keep it from being decremented when they are released.
*/
void tipc_sock_release_local(struct socket *sock)
{
tipc_release(sock);
sock->ops = NULL;
sock_release(sock);
}
/**
* tipc_sock_accept_local - accept a connection on a socket created
* with tipc_sock_create_local. Use this function to avoid that
* module reference count is inadvertently incremented.
*
* @sock: the accepting socket
* @newsock: reference to the new socket to be created
* @flags: socket flags
*/
int tipc_sock_accept_local(struct socket *sock, struct socket **newsock,
int flags)
{
struct sock *sk = sock->sk;
int ret;
ret = sock_create_lite(sk->sk_family, sk->sk_type,
sk->sk_protocol, newsock);
if (ret < 0)
return ret;
ret = tipc_accept(sock, *newsock, flags);
if (ret < 0) {
sock_release(*newsock);
return ret;
}
(*newsock)->ops = sock->ops;
return ret;
}
/**
* tipc_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 tipc_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct tipc_sock *tsk;
struct sk_buff *buf;
u32 dnode;
/*
* 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;
tsk = tipc_sk(sk);
lock_sock(sk);
/*
* Reject all unreceived messages, except on an active connection
* (which disconnects locally & sends a 'FIN+' to peer)
*/
dnode = tsk_peer_node(tsk);
while (sock->state != SS_DISCONNECTING) {
buf = __skb_dequeue(&sk->sk_receive_queue);
if (buf == NULL)
break;
if (TIPC_SKB_CB(buf)->handle != NULL)
kfree_skb(buf);
else {
if ((sock->state == SS_CONNECTING) ||
(sock->state == SS_CONNECTED)) {
sock->state = SS_DISCONNECTING;
tsk->connected = 0;
tipc_node_remove_conn(dnode, tsk->ref);
}
if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT))
tipc_link_xmit(buf, dnode, 0);
}
}
tipc_sk_withdraw(tsk, 0, NULL);
tipc_sk_ref_discard(tsk->ref);
k_cancel_timer(&tsk->timer);
if (tsk->connected) {
buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
SHORT_H_SIZE, 0, dnode, tipc_own_addr,
tsk_peer_port(tsk),
tsk->ref, TIPC_ERR_NO_PORT);
if (buf)
tipc_link_xmit(buf, dnode, tsk->ref);
tipc_node_remove_conn(dnode, tsk->ref);
}
k_term_timer(&tsk->timer);
/* Discard any remaining (connection-based) messages in receive queue */
__skb_queue_purge(&sk->sk_receive_queue);
/* Reject any messages that accumulated in backlog queue */
sock->state = SS_DISCONNECTING;
release_sock(sk);
sock_put(sk);
sock->sk = NULL;
return 0;
}
/**
* tipc_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 tipc_bind(struct socket *sock, struct sockaddr *uaddr,
int uaddr_len)
{
struct sock *sk = sock->sk;
struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
struct tipc_sock *tsk = tipc_sk(sk);
int res = -EINVAL;
lock_sock(sk);
if (unlikely(!uaddr_len)) {
res = tipc_sk_withdraw(tsk, 0, NULL);
goto exit;
}
if (uaddr_len < sizeof(struct sockaddr_tipc)) {
res = -EINVAL;
goto exit;
}
if (addr->family != AF_TIPC) {
res = -EAFNOSUPPORT;
goto exit;
}
if (addr->addrtype == TIPC_ADDR_NAME)
addr->addr.nameseq.upper = addr->addr.nameseq.lower;
else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
res = -EAFNOSUPPORT;
goto exit;
}
if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
(addr->addr.nameseq.type != TIPC_TOP_SRV) &&
(addr->addr.nameseq.type != TIPC_CFG_SRV)) {
res = -EACCES;
goto exit;
}
res = (addr->scope > 0) ?
tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
exit:
release_sock(sk);
return res;
}
/**
* tipc_getname - 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 tipc_getname(struct socket *sock, struct sockaddr *uaddr,
int *uaddr_len, int peer)
{
struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
struct tipc_sock *tsk = 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 = tsk_peer_port(tsk);
addr->addr.id.node = tsk_peer_node(tsk);
} else {
addr->addr.id.ref = tsk->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;
}
/**
* tipc_poll - read and possibly block on pollmask
* @file: file structure associated with the socket
* @sock: socket for which to calculate the poll bits
* @wait: ???
*
* Returns pollmask value
*
* COMMENTARY:
* It appears that the usual socket locking mechanisms are not useful here
* since the pollmask info is potentially out-of-date the moment this routine
* exits. TCP and other protocols seem to rely on higher level poll routines
* to handle any preventable race conditions, so TIPC will do the same ...
*
* TIPC sets the returned events as follows:
*
* socket state flags set
* ------------ ---------
* unconnected no read flags
* POLLOUT if port is not congested
*
* connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
* no write flags
*
* connected POLLIN/POLLRDNORM if data in rx queue
* POLLOUT if port is not congested
*
* disconnecting POLLIN/POLLRDNORM/POLLHUP
* no write flags
*
* listening POLLIN if SYN in rx queue
* no write flags
*
* ready POLLIN/POLLRDNORM if data in rx queue
* [connectionless] POLLOUT (since port cannot be congested)
*
* IMPORTANT: The fact that a read or write operation is indicated does NOT
* imply that the operation will succeed, merely that it should be performed
* and will not block.
*/
static unsigned int tipc_poll(struct file *file, struct socket *sock,
poll_table *wait)
{
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(sk);
u32 mask = 0;
sock_poll_wait(file, sk_sleep(sk), wait);
switch ((int)sock->state) {
case SS_UNCONNECTED:
if (!tsk->link_cong)
mask |= POLLOUT;
break;
case SS_READY:
case SS_CONNECTED:
if (!tsk->link_cong && !tsk_conn_cong(tsk))
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;
}
/**
* tipc_sendmcast - send multicast message
* @sock: socket structure
* @seq: destination address
* @iov: message data to send
* @dsz: total length of message data
* @timeo: timeout to wait for wakeup
*
* Called from function tipc_sendmsg(), which has done all sanity checks
* Returns the number of bytes sent on success, or errno
*/
static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
struct iovec *iov, size_t dsz, long timeo)
{
struct sock *sk = sock->sk;
struct tipc_msg *mhdr = &tipc_sk(sk)->phdr;
struct sk_buff *buf;
uint mtu;
int rc;
msg_set_type(mhdr, TIPC_MCAST_MSG);
msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE);
msg_set_destport(mhdr, 0);
msg_set_destnode(mhdr, 0);
msg_set_nametype(mhdr, seq->type);
msg_set_namelower(mhdr, seq->lower);
msg_set_nameupper(mhdr, seq->upper);
msg_set_hdr_sz(mhdr, MCAST_H_SIZE);
new_mtu:
mtu = tipc_bclink_get_mtu();
rc = tipc_msg_build(mhdr, iov, 0, dsz, mtu, &buf);
if (unlikely(rc < 0))
return rc;
do {
rc = tipc_bclink_xmit(buf);
if (likely(rc >= 0)) {
rc = dsz;
break;
}
if (rc == -EMSGSIZE)
goto new_mtu;
if (rc != -ELINKCONG)
break;
tipc_sk(sk)->link_cong = 1;
rc = tipc_wait_for_sndmsg(sock, &timeo);
if (rc)
kfree_skb_list(buf);
} while (!rc);
return rc;
}
/* tipc_sk_mcast_rcv - Deliver multicast message to all destination sockets
*/
void tipc_sk_mcast_rcv(struct sk_buff *buf)
{
struct tipc_msg *msg = buf_msg(buf);
struct tipc_port_list dports = {0, NULL, };
struct tipc_port_list *item;
struct sk_buff *b;
uint i, last, dst = 0;
u32 scope = TIPC_CLUSTER_SCOPE;
if (in_own_node(msg_orignode(msg)))
scope = TIPC_NODE_SCOPE;
/* Create destination port list: */
tipc_nametbl_mc_translate(msg_nametype(msg),
msg_namelower(msg),
msg_nameupper(msg),
scope,
&dports);
last = dports.count;
if (!last) {
kfree_skb(buf);
return;
}
for (item = &dports; item; item = item->next) {
for (i = 0; i < PLSIZE && ++dst <= last; i++) {
b = (dst != last) ? skb_clone(buf, GFP_ATOMIC) : buf;
if (!b) {
pr_warn("Failed do clone mcast rcv buffer\n");
continue;
}
msg_set_destport(msg, item->ports[i]);
tipc_sk_rcv(b);
}
}
tipc_port_list_free(&dports);
}
/**
* tipc_sk_proto_rcv - receive a connection mng protocol message
* @tsk: receiving socket
* @dnode: node to send response message to, if any
* @buf: buffer containing protocol message
* Returns 0 (TIPC_OK) if message was consumed, 1 (TIPC_FWD_MSG) if
* (CONN_PROBE_REPLY) message should be forwarded.
*/
static int tipc_sk_proto_rcv(struct tipc_sock *tsk, u32 *dnode,
struct sk_buff *buf)
{
struct tipc_msg *msg = buf_msg(buf);
int conn_cong;
/* Ignore if connection cannot be validated: */
if (!tsk_peer_msg(tsk, msg))
goto exit;
tsk->probing_state = TIPC_CONN_OK;
if (msg_type(msg) == CONN_ACK) {
conn_cong = tsk_conn_cong(tsk);
tsk->sent_unacked -= msg_msgcnt(msg);
if (conn_cong)
tsk->sk.sk_write_space(&tsk->sk);
} else if (msg_type(msg) == CONN_PROBE) {
if (!tipc_msg_reverse(buf, dnode, TIPC_OK))
return TIPC_OK;
msg_set_type(msg, CONN_PROBE_REPLY);
return TIPC_FWD_MSG;
}
/* Do nothing if msg_type() == CONN_PROBE_REPLY */
exit:
kfree_skb(buf);
return TIPC_OK;
}
/**
* 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 (unlikely(dest->addrtype == TIPC_ADDR_ID))
return 0;
if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
return 0;
if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
return 0;
if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
return -EACCES;
if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr)))
return -EMSGSIZE;
if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
return -EFAULT;
if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
return -EACCES;
return 0;
}
static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
{
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(sk);
DEFINE_WAIT(wait);
int done;
do {
int err = sock_error(sk);
if (err)
return err;
if (sock->state == SS_DISCONNECTING)
return -EPIPE;
if (!*timeo_p)
return -EAGAIN;
if (signal_pending(current))
return sock_intr_errno(*timeo_p);
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
done = sk_wait_event(sk, timeo_p, !tsk->link_cong);
finish_wait(sk_sleep(sk), &wait);
} while (!done);
return 0;
}
/**
* tipc_sendmsg - send message in connectionless manner
* @iocb: if NULL, indicates that socket lock is already held
* @sock: socket structure
* @m: message to send
* @dsz: amount of user data to be sent
*
* 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 tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t dsz)
{
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(sk);
struct tipc_msg *mhdr = &tsk->phdr;
struct iovec *iov = m->msg_iov;
u32 dnode, dport;
struct sk_buff *buf;
struct tipc_name_seq *seq = &dest->addr.nameseq;
u32 mtu;
long timeo;
int rc = -EINVAL;
if (unlikely(!dest))
return -EDESTADDRREQ;
if (unlikely((m->msg_namelen < sizeof(*dest)) ||
(dest->family != AF_TIPC)))
return -EINVAL;
if (dsz > TIPC_MAX_USER_MSG_SIZE)
return -EMSGSIZE;
if (iocb)
lock_sock(sk);
if (unlikely(sock->state != SS_READY)) {
if (sock->state == SS_LISTENING) {
rc = -EPIPE;
goto exit;
}
if (sock->state != SS_UNCONNECTED) {
rc = -EISCONN;
goto exit;
}
if (tsk->published) {
rc = -EOPNOTSUPP;
goto exit;
}
if (dest->addrtype == TIPC_ADDR_NAME) {
tsk->conn_type = dest->addr.name.name.type;
tsk->conn_instance = dest->addr.name.name.instance;
}
}
rc = dest_name_check(dest, m);
if (rc)
goto exit;
timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
if (dest->addrtype == TIPC_ADDR_MCAST) {
rc = tipc_sendmcast(sock, seq, iov, dsz, timeo);
goto exit;
} else if (dest->addrtype == TIPC_ADDR_NAME) {
u32 type = dest->addr.name.name.type;
u32 inst = dest->addr.name.name.instance;
u32 domain = dest->addr.name.domain;
dnode = domain;
msg_set_type(mhdr, TIPC_NAMED_MSG);
msg_set_hdr_sz(mhdr, NAMED_H_SIZE);
msg_set_nametype(mhdr, type);
msg_set_nameinst(mhdr, inst);
msg_set_lookup_scope(mhdr, tipc_addr_scope(domain));
dport = tipc_nametbl_translate(type, inst, &dnode);
msg_set_destnode(mhdr, dnode);
msg_set_destport(mhdr, dport);
if (unlikely(!dport && !dnode)) {
rc = -EHOSTUNREACH;
goto exit;
}
} else if (dest->addrtype == TIPC_ADDR_ID) {
dnode = dest->addr.id.node;
msg_set_type(mhdr, TIPC_DIRECT_MSG);
msg_set_lookup_scope(mhdr, 0);
msg_set_destnode(mhdr, dnode);
msg_set_destport(mhdr, dest->addr.id.ref);
msg_set_hdr_sz(mhdr, BASIC_H_SIZE);
}
new_mtu:
mtu = tipc_node_get_mtu(dnode, tsk->ref);
rc = tipc_msg_build(mhdr, iov, 0, dsz, mtu, &buf);
if (rc < 0)
goto exit;
do {
TIPC_SKB_CB(buf)->wakeup_pending = tsk->link_cong;
rc = tipc_link_xmit(buf, dnode, tsk->ref);
if (likely(rc >= 0)) {
if (sock->state != SS_READY)
sock->state = SS_CONNECTING;
rc = dsz;
break;
}
if (rc == -EMSGSIZE)
goto new_mtu;
if (rc != -ELINKCONG)
break;
tsk->link_cong = 1;
rc = tipc_wait_for_sndmsg(sock, &timeo);
if (rc)
kfree_skb_list(buf);
} while (!rc);
exit:
if (iocb)
release_sock(sk);
return rc;
}
static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
{
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(sk);
DEFINE_WAIT(wait);
int done;
do {
int err = sock_error(sk);
if (err)
return err;
if (sock->state == SS_DISCONNECTING)
return -EPIPE;
else if (sock->state != SS_CONNECTED)
return -ENOTCONN;
if (!*timeo_p)
return -EAGAIN;
if (signal_pending(current))
return sock_intr_errno(*timeo_p);
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
done = sk_wait_event(sk, timeo_p,
(!tsk->link_cong &&
!tsk_conn_cong(tsk)) ||
!tsk->connected);
finish_wait(sk_sleep(sk), &wait);
} while (!done);
return 0;
}
/**
* tipc_send_stream - send stream-oriented data
* @iocb: (unused)
* @sock: socket structure
* @m: data to send
* @dsz: total length of data to be transmitted
*
* Used for SOCK_STREAM data.
*
* Returns the number of bytes sent on success (or partial success),
* or errno if no data sent
*/
static int tipc_send_stream(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t dsz)
{
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(sk);
struct tipc_msg *mhdr = &tsk->phdr;
struct sk_buff *buf;
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
u32 ref = tsk->ref;
int rc = -EINVAL;
long timeo;
u32 dnode;
uint mtu, send, sent = 0;
/* Handle implied connection establishment */
if (unlikely(dest)) {
rc = tipc_sendmsg(iocb, sock, m, dsz);
if (dsz && (dsz == rc))
tsk->sent_unacked = 1;
return rc;
}
if (dsz > (uint)INT_MAX)
return -EMSGSIZE;
if (iocb)
lock_sock(sk);
if (unlikely(sock->state != SS_CONNECTED)) {
if (sock->state == SS_DISCONNECTING)
rc = -EPIPE;
else
rc = -ENOTCONN;
goto exit;
}
timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
dnode = tsk_peer_node(tsk);
next:
mtu = tsk->max_pkt;
send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE);
rc = tipc_msg_build(mhdr, m->msg_iov, sent, send, mtu, &buf);
if (unlikely(rc < 0))
goto exit;
do {
if (likely(!tsk_conn_cong(tsk))) {
rc = tipc_link_xmit(buf, dnode, ref);
if (likely(!rc)) {
tsk->sent_unacked++;
sent += send;
if (sent == dsz)
break;
goto next;
}
if (rc == -EMSGSIZE) {
tsk->max_pkt = tipc_node_get_mtu(dnode, ref);
goto next;
}
if (rc != -ELINKCONG)
break;
tsk->link_cong = 1;
}
rc = tipc_wait_for_sndpkt(sock, &timeo);
if (rc)
kfree_skb_list(buf);
} while (!rc);
exit:
if (iocb)
release_sock(sk);
return sent ? sent : rc;
}
/**
* tipc_send_packet - send a connection-oriented message
* @iocb: if NULL, indicates that socket lock is already held
* @sock: socket structure
* @m: message to send
* @dsz: length of data to be transmitted
*
* Used for SOCK_SEQPACKET messages.
*
* Returns the number of bytes sent on success, or errno otherwise
*/
static int tipc_send_packet(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t dsz)
{
if (dsz > TIPC_MAX_USER_MSG_SIZE)
return -EMSGSIZE;
return tipc_send_stream(iocb, sock, m, dsz);
}
/* tipc_sk_finish_conn - complete the setup of a connection
*/
static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
u32 peer_node)
{
struct tipc_msg *msg = &tsk->phdr;
msg_set_destnode(msg, peer_node);
msg_set_destport(msg, peer_port);
msg_set_type(msg, TIPC_CONN_MSG);
msg_set_lookup_scope(msg, 0);
msg_set_hdr_sz(msg, SHORT_H_SIZE);
tsk->probing_interval = CONN_PROBING_INTERVAL;
tsk->probing_state = TIPC_CONN_OK;
tsk->connected = 1;
k_start_timer(&tsk->timer, tsk->probing_interval);
tipc_node_add_conn(peer_node, tsk->ref, peer_port);
tsk->max_pkt = tipc_node_get_mtu(peer_node, tsk->ref);
}
/**
* set_orig_addr - capture sender's address for received message
* @m: descriptor for message info
* @msg: received message header
*
* Note: Address is not captured if not requested by receiver.
*/
static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
{
DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
if (addr) {
addr->family = AF_TIPC;
addr->addrtype = TIPC_ADDR_ID;
memset(&addr->addr, 0, sizeof(addr->addr));
addr->addr.id.ref = msg_origport(msg);
addr->addr.id.node = msg_orignode(msg);
addr->addr.name.domain = 0; /* could leave uninitialized */
addr->scope = 0; /* could leave uninitialized */
m->msg_namelen = sizeof(struct sockaddr_tipc);
}
}
/**
* tipc_sk_anc_data_recv - optionally capture ancillary data for received message
* @m: descriptor for message info
* @msg: received message header
* @tsk: TIPC port associated with message
*
* Note: Ancillary data is not captured if not requested by receiver.
*
* Returns 0 if successful, otherwise errno
*/
static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
struct tipc_sock *tsk)
{
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 = (tsk->conn_type != 0);
anc_data[0] = tsk->conn_type;
anc_data[1] = tsk->conn_instance;
anc_data[2] = tsk->conn_instance;
break;
default:
has_name = 0;
}
if (has_name) {
res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
if (res)
return res;
}
return 0;
}
static void tipc_sk_send_ack(struct tipc_sock *tsk, uint ack)
{
struct sk_buff *buf = NULL;
struct tipc_msg *msg;
u32 peer_port = tsk_peer_port(tsk);
u32 dnode = tsk_peer_node(tsk);
if (!tsk->connected)
return;
buf = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, dnode,
tipc_own_addr, peer_port, tsk->ref, TIPC_OK);
if (!buf)
return;
msg = buf_msg(buf);
msg_set_msgcnt(msg, ack);
tipc_link_xmit(buf, dnode, msg_link_selector(msg));
}
static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
{
struct sock *sk = sock->sk;
DEFINE_WAIT(wait);
long timeo = *timeop;
int err;
for (;;) {
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
if (sock->state == SS_DISCONNECTING) {
err = -ENOTCONN;
break;
}
release_sock(sk);
timeo = schedule_timeout(timeo);
lock_sock(sk);
}
err = 0;
if (!skb_queue_empty(&sk->sk_receive_queue))
break;
err = sock_intr_errno(timeo);
if (signal_pending(current))
break;
err = -EAGAIN;
if (!timeo)
break;
}
finish_wait(sk_sleep(sk), &wait);
*timeop = timeo;
return err;
}
/**
* tipc_recvmsg - 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 tipc_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t buf_len, int flags)
{
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(sk);
struct sk_buff *buf;
struct tipc_msg *msg;
long timeo;
unsigned int sz;
u32 err;
int res;
/* Catch invalid receive requests */
if (unlikely(!buf_len))
return -EINVAL;
lock_sock(sk);
if (unlikely(sock->state == SS_UNCONNECTED)) {
res = -ENOTCONN;
goto exit;
}
timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
restart:
/* Look for a message in receive queue; wait if necessary */
res = tipc_wait_for_rcvmsg(sock, &timeo);
if (res)
goto exit;
/* Look at first message in receive queue */
buf = skb_peek(&sk->sk_receive_queue);
msg = buf_msg(buf);
sz = msg_data_sz(msg);
err = msg_errcode(msg);
/* Discard an empty non-errored message & try again */
if ((!sz) && (!err)) {
tsk_advance_rx_queue(sk);
goto restart;
}
/* Capture sender's address (optional) */
set_orig_addr(m, msg);
/* Capture ancillary data (optional) */
res = tipc_sk_anc_data_recv(m, msg, tsk);
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) &&
(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
tipc_sk_send_ack(tsk, tsk->rcv_unacked);
tsk->rcv_unacked = 0;
}
tsk_advance_rx_queue(sk);
}
exit:
release_sock(sk);
return res;
}
/**
* tipc_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 tipc_recv_stream(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t buf_len, int flags)
{
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(sk);
struct sk_buff *buf;
struct tipc_msg *msg;
long timeo;
unsigned int sz;
int sz_to_copy, target, needed;
int sz_copied = 0;
u32 err;
int res = 0;
/* Catch invalid receive attempts */
if (unlikely(!buf_len))
return -EINVAL;
lock_sock(sk);
if (unlikely(sock->state == SS_UNCONNECTED)) {
res = -ENOTCONN;
goto exit;
}
target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
restart:
/* Look for a message in receive queue; wait if necessary */
res = tipc_wait_for_rcvmsg(sock, &timeo);
if (res)
goto exit;
/* Look at first message in receive queue */
buf = skb_peek(&sk->sk_receive_queue);
msg = buf_msg(buf);
sz = msg_data_sz(msg);
err = msg_errcode(msg);
/* Discard an empty non-errored message & try again */
if ((!sz) && (!err)) {
tsk_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 = tipc_sk_anc_data_recv(m, msg, tsk);
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(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
tipc_sk_send_ack(tsk, tsk->rcv_unacked);
tsk->rcv_unacked = 0;
}
tsk_advance_rx_queue(sk);
}
/* Loop around if more data is required */
if ((sz_copied < buf_len) && /* didn't get all requested data */
(!skb_queue_empty(&sk->sk_receive_queue) ||
(sz_copied < target)) && /* and more is ready or required */
(!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
(!err)) /* and haven't reached a FIN */
goto restart;
exit:
release_sock(sk);
return sz_copied ? sz_copied : res;
}
/**
* tipc_write_space - wake up thread if port congestion is released
* @sk: socket
*/
static void tipc_write_space(struct sock *sk)
{
struct socket_wq *wq;
rcu_read_lock();
wq = rcu_dereference(sk->sk_wq);
if (wq_has_sleeper(wq))
wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
POLLWRNORM | POLLWRBAND);
rcu_read_unlock();
}
/**
* tipc_data_ready - wake up threads to indicate messages have been received
* @sk: socket
* @len: the length of messages
*/
static void tipc_data_ready(struct sock *sk)
{
struct socket_wq *wq;
rcu_read_lock();
wq = rcu_dereference(sk->sk_wq);
if (wq_has_sleeper(wq))
wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
POLLRDNORM | POLLRDBAND);
rcu_read_unlock();
}
/**
* filter_connect - Handle all incoming messages for a connection-based socket
* @tsk: TIPC socket
* @msg: message
*
* Returns 0 (TIPC_OK) if everyting ok, -TIPC_ERR_NO_PORT otherwise
*/
static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf)
{
struct sock *sk = &tsk->sk;
struct socket *sock = sk->sk_socket;
struct tipc_msg *msg = buf_msg(*buf);
int retval = -TIPC_ERR_NO_PORT;
if (msg_mcast(msg))
return retval;
switch ((int)sock->state) {
case SS_CONNECTED:
/* Accept only connection-based messages sent by peer */
if (tsk_peer_msg(tsk, msg)) {
if (unlikely(msg_errcode(msg))) {
sock->state = SS_DISCONNECTING;
tsk->connected = 0;
/* let timer expire on it's own */
tipc_node_remove_conn(tsk_peer_node(tsk),
tsk->ref);
}
retval = TIPC_OK;
}
break;
case SS_CONNECTING:
/* Accept only ACK or NACK message */
if (unlikely(!msg_connected(msg)))
break;
if (unlikely(msg_errcode(msg))) {
sock->state = SS_DISCONNECTING;
sk->sk_err = ECONNREFUSED;
retval = TIPC_OK;
break;
}
if (unlikely(msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)) {
sock->state = SS_DISCONNECTING;
sk->sk_err = EINVAL;
retval = TIPC_OK;
break;
}
tipc_sk_finish_conn(tsk, msg_origport(msg), msg_orignode(msg));
msg_set_importance(&tsk->phdr, msg_importance(msg));
sock->state = SS_CONNECTED;
/* If an incoming message is an 'ACK-', it should be
* discarded here because it doesn't contain useful
* data. In addition, we should try to wake up
* connect() routine if sleeping.
*/
if (msg_data_sz(msg) == 0) {
kfree_skb(*buf);
*buf = NULL;
if (waitqueue_active(sk_sleep(sk)))
wake_up_interruptible(sk_sleep(sk));
}
retval = TIPC_OK;
break;
case SS_LISTENING:
case SS_UNCONNECTED:
/* Accept only SYN message */
if (!msg_connected(msg) && !(msg_errcode(msg)))
retval = TIPC_OK;
break;
case SS_DISCONNECTING:
break;
default:
pr_err("Unknown socket state %u\n", sock->state);
}
return retval;
}
/**
* rcvbuf_limit - get proper overload limit of socket receive queue
* @sk: socket
* @buf: message
*
* For all connection oriented messages, irrespective of importance,
* the default overload value (i.e. 67MB) is set as limit.
*
* For all connectionless messages, by default new queue limits are
* as belows:
*
* TIPC_LOW_IMPORTANCE (4 MB)
* TIPC_MEDIUM_IMPORTANCE (8 MB)
* TIPC_HIGH_IMPORTANCE (16 MB)
* TIPC_CRITICAL_IMPORTANCE (32 MB)
*
* Returns overload limit according to corresponding message importance
*/
static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
{
struct tipc_msg *msg = buf_msg(buf);
if (msg_connected(msg))
return sysctl_tipc_rmem[2];
return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
msg_importance(msg);
}
/**
* filter_rcv - validate incoming message
* @sk: socket
* @buf: message
*
* Enqueues message on receive queue if acceptable; optionally handles
* disconnect indication for a connected socket.
*
* Called with socket lock already taken; port lock may also be taken.
*
* Returns 0 (TIPC_OK) if message was consumed, -TIPC error code if message
* to be rejected, 1 (TIPC_FWD_MSG) if (CONN_MANAGER) message to be forwarded
*/
static int filter_rcv(struct sock *sk, struct sk_buff *buf)
{
struct socket *sock = sk->sk_socket;
struct tipc_sock *tsk = tipc_sk(sk);
struct tipc_msg *msg = buf_msg(buf);
unsigned int limit = rcvbuf_limit(sk, buf);
u32 onode;
int rc = TIPC_OK;
if (unlikely(msg_user(msg) == CONN_MANAGER))
return tipc_sk_proto_rcv(tsk, &onode, buf);
if (unlikely(msg_user(msg) == SOCK_WAKEUP)) {
kfree_skb(buf);
tsk->link_cong = 0;
sk->sk_write_space(sk);
return 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 {
rc = filter_connect(tsk, &buf);
if (rc != TIPC_OK || buf == NULL)
return rc;
}
/* Reject message if there isn't room to queue it */
if (sk_rmem_alloc_get(sk) + buf->truesize >= limit)
return -TIPC_ERR_OVERLOAD;
/* Enqueue message */
TIPC_SKB_CB(buf)->handle = NULL;
__skb_queue_tail(&sk->sk_receive_queue, buf);
skb_set_owner_r(buf, sk);
sk->sk_data_ready(sk);
return TIPC_OK;
}
/**
* tipc_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 tipc_backlog_rcv(struct sock *sk, struct sk_buff *buf)
{
int rc;
u32 onode;
struct tipc_sock *tsk = tipc_sk(sk);
uint truesize = buf->truesize;
rc = filter_rcv(sk, buf);
if (likely(!rc)) {
if (atomic_read(&tsk->dupl_rcvcnt) < TIPC_CONN_OVERLOAD_LIMIT)
atomic_add(truesize, &tsk->dupl_rcvcnt);
return 0;
}
if ((rc < 0) && !tipc_msg_reverse(buf, &onode, -rc))
return 0;
tipc_link_xmit(buf, onode, 0);
return 0;
}
/**
* tipc_sk_rcv - handle incoming message
* @buf: buffer containing arriving message
* Consumes buffer
* Returns 0 if success, or errno: -EHOSTUNREACH
*/
int tipc_sk_rcv(struct sk_buff *buf)
{
struct tipc_sock *tsk;
struct sock *sk;
u32 dport = msg_destport(buf_msg(buf));
int rc = TIPC_OK;
uint limit;
u32 dnode;
/* Validate destination and message */
tsk = tipc_sk_get(dport);
if (unlikely(!tsk)) {
rc = tipc_msg_eval(buf, &dnode);
goto exit;
}
sk = &tsk->sk;
/* Queue message */
spin_lock_bh(&sk->sk_lock.slock);
if (!sock_owned_by_user(sk)) {
rc = filter_rcv(sk, buf);
} else {
if (sk->sk_backlog.len == 0)
atomic_set(&tsk->dupl_rcvcnt, 0);
limit = rcvbuf_limit(sk, buf) + atomic_read(&tsk->dupl_rcvcnt);
if (sk_add_backlog(sk, buf, limit))
rc = -TIPC_ERR_OVERLOAD;
}
spin_unlock_bh(&sk->sk_lock.slock);
tipc_sk_put(tsk);
if (likely(!rc))
return 0;
exit:
if ((rc < 0) && !tipc_msg_reverse(buf, &dnode, -rc))
return -EHOSTUNREACH;
tipc_link_xmit(buf, dnode, 0);
return (rc < 0) ? -EHOSTUNREACH : 0;
}
static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
{
struct sock *sk = sock->sk;
DEFINE_WAIT(wait);
int done;
do {
int err = sock_error(sk);
if (err)
return err;
if (!*timeo_p)
return -ETIMEDOUT;
if (signal_pending(current))
return sock_intr_errno(*timeo_p);
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING);
finish_wait(sk_sleep(sk), &wait);
} while (!done);
return 0;
}
/**
* tipc_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 tipc_connect(struct socket *sock, struct sockaddr *dest,
int destlen, int flags)
{
struct sock *sk = sock->sk;
struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
struct msghdr m = {NULL,};
long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout;
socket_state previous;
int res;
lock_sock(sk);
/* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
if (sock->state == SS_READY) {
res = -EOPNOTSUPP;
goto exit;
}
/*
* Reject connection attempt using multicast address
*
* Note: send_msg() validates the rest of the address fields,
* so there's no need to do it here
*/
if (dst->addrtype == TIPC_ADDR_MCAST) {
res = -EINVAL;
goto exit;
}
previous = sock->state;
switch (sock->state) {
case SS_UNCONNECTED:
/* Send a 'SYN-' to destination */
m.msg_name = dest;
m.msg_namelen = destlen;
/* If connect is in non-blocking case, set MSG_DONTWAIT to
* indicate send_msg() is never blocked.
*/
if (!timeout)
m.msg_flags = MSG_DONTWAIT;
res = tipc_sendmsg(NULL, sock, &m, 0);
if ((res < 0) && (res != -EWOULDBLOCK))
goto exit;
/* Just entered SS_CONNECTING state; the only
* difference is that return value in non-blocking
* case is EINPROGRESS, rather than EALREADY.
*/
res = -EINPROGRESS;
case SS_CONNECTING:
if (previous == SS_CONNECTING)
res = -EALREADY;
if (!timeout)
goto exit;
timeout = msecs_to_jiffies(timeout);
/* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
res = tipc_wait_for_connect(sock, &timeout);
break;
case SS_CONNECTED:
res = -EISCONN;
break;
default:
res = -EINVAL;
break;
}
exit:
release_sock(sk);
return res;
}
/**
* tipc_listen - allow socket to listen for incoming connections
* @sock: socket structure
* @len: (unused)
*
* Returns 0 on success, errno otherwise
*/
static int tipc_listen(struct socket *sock, int len)
{
struct sock *sk = sock->sk;
int res;
lock_sock(sk);
if (sock->state != SS_UNCONNECTED)
res = -EINVAL;
else {
sock->state = SS_LISTENING;
res = 0;
}
release_sock(sk);
return res;
}
static int tipc_wait_for_accept(struct socket *sock, long timeo)
{
struct sock *sk = sock->sk;
DEFINE_WAIT(wait);
int err;
/* True wake-one mechanism for incoming connections: only
* one process gets woken up, not the 'whole herd'.
* Since we do not 'race & poll' for established sockets
* anymore, the common case will execute the loop only once.
*/
for (;;) {
prepare_to_wait_exclusive(sk_sleep(sk), &wait,
TASK_INTERRUPTIBLE);
if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
release_sock(sk);
timeo = schedule_timeout(timeo);
lock_sock(sk);
}
err = 0;
if (!skb_queue_empty(&sk->sk_receive_queue))
break;
err = -EINVAL;
if (sock->state != SS_LISTENING)
break;
err = sock_intr_errno(timeo);
if (signal_pending(current))
break;
err = -EAGAIN;
if (!timeo)
break;
}
finish_wait(sk_sleep(sk), &wait);
return err;
}
/**
* tipc_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 tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
{
struct sock *new_sk, *sk = sock->sk;
struct sk_buff *buf;
struct tipc_sock *new_tsock;
struct tipc_msg *msg;
long timeo;
int res;
lock_sock(sk);
if (sock->state != SS_LISTENING) {
res = -EINVAL;
goto exit;
}
timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
res = tipc_wait_for_accept(sock, timeo);
if (res)
goto exit;
buf = skb_peek(&sk->sk_receive_queue);
res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
if (res)
goto exit;
security_sk_clone(sock->sk, new_sock->sk);
new_sk = new_sock->sk;
new_tsock = tipc_sk(new_sk);
msg = buf_msg(buf);
/* we lock on new_sk; but lockdep sees the lock on sk */
lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
/*
* Reject any stray messages received by new socket
* before the socket lock was taken (very, very unlikely)
*/
tsk_rej_rx_queue(new_sk);
/* Connect new socket to it's peer */
tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
new_sock->state = SS_CONNECTED;
tsk_set_importance(new_tsock, msg_importance(msg));
if (msg_named(msg)) {
new_tsock->conn_type = msg_nametype(msg);
new_tsock->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,};
tsk_advance_rx_queue(sk);
tipc_send_packet(NULL, new_sock, &m, 0);
} else {
__skb_dequeue(&sk->sk_receive_queue);
__skb_queue_head(&new_sk->sk_receive_queue, buf);
skb_set_owner_r(buf, new_sk);
}
release_sock(new_sk);
exit:
release_sock(sk);
return res;
}
/**
* tipc_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 tipc_shutdown(struct socket *sock, int how)
{
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(sk);
struct sk_buff *buf;
u32 dnode;
int res;
if (how != SHUT_RDWR)
return -EINVAL;
lock_sock(sk);
switch (sock->state) {
case SS_CONNECTING:
case SS_CONNECTED:
restart:
/* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
buf = __skb_dequeue(&sk->sk_receive_queue);
if (buf) {
if (TIPC_SKB_CB(buf)->handle != NULL) {
kfree_skb(buf);
goto restart;
}
if (tipc_msg_reverse(buf, &dnode, TIPC_CONN_SHUTDOWN))
tipc_link_xmit(buf, dnode, tsk->ref);
tipc_node_remove_conn(dnode, tsk->ref);
} else {
dnode = tsk_peer_node(tsk);
buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
TIPC_CONN_MSG, SHORT_H_SIZE,
0, dnode, tipc_own_addr,
tsk_peer_port(tsk),
tsk->ref, TIPC_CONN_SHUTDOWN);
tipc_link_xmit(buf, dnode, tsk->ref);
}
tsk->connected = 0;
sock->state = SS_DISCONNECTING;
tipc_node_remove_conn(dnode, tsk->ref);
/* fall through */
case SS_DISCONNECTING:
/* Discard any unreceived messages */
__skb_queue_purge(&sk->sk_receive_queue);
/* Wake up anyone sleeping in poll */
sk->sk_state_change(sk);
res = 0;
break;
default:
res = -ENOTCONN;
}
release_sock(sk);
return res;
}
static void tipc_sk_timeout(unsigned long ref)
{
struct tipc_sock *tsk;
struct sock *sk;
struct sk_buff *buf = NULL;
u32 peer_port, peer_node;
tsk = tipc_sk_get(ref);
if (!tsk)
return;
sk = &tsk->sk;
bh_lock_sock(sk);
if (!tsk->connected) {
bh_unlock_sock(sk);
goto exit;
}
peer_port = tsk_peer_port(tsk);
peer_node = tsk_peer_node(tsk);
if (tsk->probing_state == TIPC_CONN_PROBING) {
/* Previous probe not answered -> self abort */
buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
SHORT_H_SIZE, 0, tipc_own_addr,
peer_node, ref, peer_port,
TIPC_ERR_NO_PORT);
} else {
buf = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE,
0, peer_node, tipc_own_addr,
peer_port, ref, TIPC_OK);
tsk->probing_state = TIPC_CONN_PROBING;
k_start_timer(&tsk->timer, tsk->probing_interval);
}
bh_unlock_sock(sk);
if (buf)
tipc_link_xmit(buf, peer_node, ref);
exit:
tipc_sk_put(tsk);
}
static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
struct tipc_name_seq const *seq)
{
struct publication *publ;
u32 key;
if (tsk->connected)
return -EINVAL;
key = tsk->ref + tsk->pub_count + 1;
if (key == tsk->ref)
return -EADDRINUSE;
publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
scope, tsk->ref, key);
if (unlikely(!publ))
return -EINVAL;
list_add(&publ->pport_list, &tsk->publications);
tsk->pub_count++;
tsk->published = 1;
return 0;
}
static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
struct tipc_name_seq const *seq)
{
struct publication *publ;
struct publication *safe;
int rc = -EINVAL;
list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) {
if (seq) {
if (publ->scope != scope)
continue;
if (publ->type != seq->type)
continue;
if (publ->lower != seq->lower)
continue;
if (publ->upper != seq->upper)
break;
tipc_nametbl_withdraw(publ->type, publ->lower,
publ->ref, publ->key);
rc = 0;
break;
}
tipc_nametbl_withdraw(publ->type, publ->lower,
publ->ref, publ->key);
rc = 0;
}
if (list_empty(&tsk->publications))
tsk->published = 0;
return rc;
}
static int tipc_sk_show(struct tipc_sock *tsk, char *buf,
int len, int full_id)
{
struct publication *publ;
int ret;
if (full_id)
ret = tipc_snprintf(buf, len, "<%u.%u.%u:%u>:",
tipc_zone(tipc_own_addr),
tipc_cluster(tipc_own_addr),
tipc_node(tipc_own_addr), tsk->ref);
else
ret = tipc_snprintf(buf, len, "%-10u:", tsk->ref);
if (tsk->connected) {
u32 dport = tsk_peer_port(tsk);
u32 destnode = tsk_peer_node(tsk);
ret += tipc_snprintf(buf + ret, len - ret,
" connected to <%u.%u.%u:%u>",
tipc_zone(destnode),
tipc_cluster(destnode),
tipc_node(destnode), dport);
if (tsk->conn_type != 0)
ret += tipc_snprintf(buf + ret, len - ret,
" via {%u,%u}", tsk->conn_type,
tsk->conn_instance);
} else if (tsk->published) {
ret += tipc_snprintf(buf + ret, len - ret, " bound to");
list_for_each_entry(publ, &tsk->publications, pport_list) {
if (publ->lower == publ->upper)
ret += tipc_snprintf(buf + ret, len - ret,
" {%u,%u}", publ->type,
publ->lower);
else
ret += tipc_snprintf(buf + ret, len - ret,
" {%u,%u,%u}", publ->type,
publ->lower, publ->upper);
}
}
ret += tipc_snprintf(buf + ret, len - ret, "\n");
return ret;
}
struct sk_buff *tipc_sk_socks_show(void)
{
struct sk_buff *buf;
struct tlv_desc *rep_tlv;
char *pb;
int pb_len;
struct tipc_sock *tsk;
int str_len = 0;
u32 ref = 0;
buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
if (!buf)
return NULL;
rep_tlv = (struct tlv_desc *)buf->data;
pb = TLV_DATA(rep_tlv);
pb_len = ULTRA_STRING_MAX_LEN;
tsk = tipc_sk_get_next(&ref);
for (; tsk; tsk = tipc_sk_get_next(&ref)) {
lock_sock(&tsk->sk);
str_len += tipc_sk_show(tsk, pb + str_len,
pb_len - str_len, 0);
release_sock(&tsk->sk);
tipc_sk_put(tsk);
}
str_len += 1; /* for "\0" */
skb_put(buf, TLV_SPACE(str_len));
TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
return buf;
}
/* tipc_sk_reinit: set non-zero address in all existing sockets
* when we go from standalone to network mode.
*/
void tipc_sk_reinit(void)
{
struct tipc_msg *msg;
u32 ref = 0;
struct tipc_sock *tsk = tipc_sk_get_next(&ref);
for (; tsk; tsk = tipc_sk_get_next(&ref)) {
lock_sock(&tsk->sk);
msg = &tsk->phdr;
msg_set_prevnode(msg, tipc_own_addr);
msg_set_orignode(msg, tipc_own_addr);
release_sock(&tsk->sk);
tipc_sk_put(tsk);
}
}
/**
* struct reference - TIPC socket reference entry
* @tsk: pointer to socket associated with reference entry
* @ref: reference value for socket (combines instance & array index info)
*/
struct reference {
struct tipc_sock *tsk;
u32 ref;
};
/**
* struct tipc_ref_table - table of TIPC socket reference entries
* @entries: pointer to array of reference entries
* @capacity: array index of first unusable entry
* @init_point: array index of first uninitialized entry
* @first_free: array index of first unused socket reference entry
* @last_free: array index of last unused socket reference entry
* @index_mask: bitmask for array index portion of reference values
* @start_mask: initial value for instance value portion of reference values
*/
struct ref_table {
struct reference *entries;
u32 capacity;
u32 init_point;
u32 first_free;
u32 last_free;
u32 index_mask;
u32 start_mask;
};
/* Socket reference table consists of 2**N entries.
*
* State Socket ptr Reference
* ----- ---------- ---------
* In use non-NULL XXXX|own index
* (XXXX changes each time entry is acquired)
* Free NULL YYYY|next free index
* (YYYY is one more than last used XXXX)
* Uninitialized NULL 0
*
* Entry 0 is not used; this allows index 0 to denote the end of the free list.
*
* Note that a reference value of 0 does not necessarily indicate that an
* entry is uninitialized, since the last entry in the free list could also
* have a reference value of 0 (although this is unlikely).
*/
static struct ref_table tipc_ref_table;
static DEFINE_RWLOCK(ref_table_lock);
/**
* tipc_ref_table_init - create reference table for sockets
*/
int tipc_sk_ref_table_init(u32 req_sz, u32 start)
{
struct reference *table;
u32 actual_sz;
/* account for unused entry, then round up size to a power of 2 */
req_sz++;
for (actual_sz = 16; actual_sz < req_sz; actual_sz <<= 1) {
/* do nothing */
};
/* allocate table & mark all entries as uninitialized */
table = vzalloc(actual_sz * sizeof(struct reference));
if (table == NULL)
return -ENOMEM;
tipc_ref_table.entries = table;
tipc_ref_table.capacity = req_sz;
tipc_ref_table.init_point = 1;
tipc_ref_table.first_free = 0;
tipc_ref_table.last_free = 0;
tipc_ref_table.index_mask = actual_sz - 1;
tipc_ref_table.start_mask = start & ~tipc_ref_table.index_mask;
return 0;
}
/**
* tipc_ref_table_stop - destroy reference table for sockets
*/
void tipc_sk_ref_table_stop(void)
{
if (!tipc_ref_table.entries)
return;
vfree(tipc_ref_table.entries);
tipc_ref_table.entries = NULL;
}
/* tipc_ref_acquire - create reference to a socket
*
* Register an socket pointer in the reference table.
* Returns a unique reference value that is used from then on to retrieve the
* socket pointer, or to determine if the socket has been deregistered.
*/
u32 tipc_sk_ref_acquire(struct tipc_sock *tsk)
{
u32 index;
u32 index_mask;
u32 next_plus_upper;
u32 ref = 0;
struct reference *entry;
if (unlikely(!tsk)) {
pr_err("Attempt to acquire ref. to non-existent obj\n");
return 0;
}
if (unlikely(!tipc_ref_table.entries)) {
pr_err("Ref. table not found in acquisition attempt\n");
return 0;
}
/* Take a free entry, if available; otherwise initialize a new one */
write_lock_bh(&ref_table_lock);
index = tipc_ref_table.first_free;
entry = &tipc_ref_table.entries[index];
if (likely(index)) {
index = tipc_ref_table.first_free;
entry = &tipc_ref_table.entries[index];
index_mask = tipc_ref_table.index_mask;
next_plus_upper = entry->ref;
tipc_ref_table.first_free = next_plus_upper & index_mask;
ref = (next_plus_upper & ~index_mask) + index;
entry->tsk = tsk;
} else if (tipc_ref_table.init_point < tipc_ref_table.capacity) {
index = tipc_ref_table.init_point++;
entry = &tipc_ref_table.entries[index];
ref = tipc_ref_table.start_mask + index;
}
if (ref) {
entry->ref = ref;
entry->tsk = tsk;
}
write_unlock_bh(&ref_table_lock);
return ref;
}
/* tipc_sk_ref_discard - invalidate reference to an socket
*
* Disallow future references to an socket and free up the entry for re-use.
*/
void tipc_sk_ref_discard(u32 ref)
{
struct reference *entry;
u32 index;
u32 index_mask;
if (unlikely(!tipc_ref_table.entries)) {
pr_err("Ref. table not found during discard attempt\n");
return;
}
index_mask = tipc_ref_table.index_mask;
index = ref & index_mask;
entry = &tipc_ref_table.entries[index];
write_lock_bh(&ref_table_lock);
if (unlikely(!entry->tsk)) {
pr_err("Attempt to discard ref. to non-existent socket\n");
goto exit;
}
if (unlikely(entry->ref != ref)) {
pr_err("Attempt to discard non-existent reference\n");
goto exit;
}
/* Mark entry as unused; increment instance part of entry's
* reference to invalidate any subsequent references
*/
entry->tsk = NULL;
entry->ref = (ref & ~index_mask) + (index_mask + 1);
/* Append entry to free entry list */
if (unlikely(tipc_ref_table.first_free == 0))
tipc_ref_table.first_free = index;
else
tipc_ref_table.entries[tipc_ref_table.last_free].ref |= index;
tipc_ref_table.last_free = index;
exit:
write_unlock_bh(&ref_table_lock);
}
/* tipc_sk_get - find referenced socket and return pointer to it
*/
struct tipc_sock *tipc_sk_get(u32 ref)
{
struct reference *entry;
struct tipc_sock *tsk;
if (unlikely(!tipc_ref_table.entries))
return NULL;
read_lock_bh(&ref_table_lock);
entry = &tipc_ref_table.entries[ref & tipc_ref_table.index_mask];
tsk = entry->tsk;
if (likely(tsk && (entry->ref == ref)))
sock_hold(&tsk->sk);
else
tsk = NULL;
read_unlock_bh(&ref_table_lock);
return tsk;
}
/* tipc_sk_get_next - lock & return next socket after referenced one
*/
struct tipc_sock *tipc_sk_get_next(u32 *ref)
{
struct reference *entry;
struct tipc_sock *tsk = NULL;
uint index = *ref & tipc_ref_table.index_mask;
read_lock_bh(&ref_table_lock);
while (++index < tipc_ref_table.capacity) {
entry = &tipc_ref_table.entries[index];
if (!entry->tsk)
continue;
tsk = entry->tsk;
sock_hold(&tsk->sk);
*ref = entry->ref;
break;
}
read_unlock_bh(&ref_table_lock);
return tsk;
}
static void tipc_sk_put(struct tipc_sock *tsk)
{
sock_put(&tsk->sk);
}
/**
* tipc_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 tipc_setsockopt(struct socket *sock, int lvl, int opt,
char __user *ov, unsigned int ol)
{
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(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 = tsk_set_importance(tsk, value);
break;
case TIPC_SRC_DROPPABLE:
if (sock->type != SOCK_STREAM)
tsk_set_unreliable(tsk, value);
else
res = -ENOPROTOOPT;
break;
case TIPC_DEST_DROPPABLE:
tsk_set_unreturnable(tsk, 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;
}
/**
* tipc_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 tipc_getsockopt(struct socket *sock, int lvl, int opt,
char __user *ov, int __user *ol)
{
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(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:
value = tsk_importance(tsk);
break;
case TIPC_SRC_DROPPABLE:
value = tsk_unreliable(tsk);
break;
case TIPC_DEST_DROPPABLE:
value = tsk_unreturnable(tsk);
break;
case TIPC_CONN_TIMEOUT:
value = tsk->conn_timeout;
/* no need to set "res", since already 0 at this point */
break;
case TIPC_NODE_RECVQ_DEPTH:
value = 0; /* was tipc_queue_size, now obsolete */
break;
case TIPC_SOCK_RECVQ_DEPTH:
value = skb_queue_len(&sk->sk_receive_queue);
break;
default:
res = -EINVAL;
}
release_sock(sk);
if (res)
return res; /* "get" failed */
if (len < sizeof(value))
return -EINVAL;
if (copy_to_user(ov, &value, sizeof(value)))
return -EFAULT;
return put_user(sizeof(value), ol);
}
static int tipc_ioctl(struct socket *sk, unsigned int cmd, unsigned long arg)
{
struct tipc_sioc_ln_req lnr;
void __user *argp = (void __user *)arg;
switch (cmd) {
case SIOCGETLINKNAME:
if (copy_from_user(&lnr, argp, sizeof(lnr)))
return -EFAULT;
if (!tipc_node_get_linkname(lnr.bearer_id & 0xffff, lnr.peer,
lnr.linkname, TIPC_MAX_LINK_NAME)) {
if (copy_to_user(argp, &lnr, sizeof(lnr)))
return -EFAULT;
return 0;
}
return -EADDRNOTAVAIL;
default:
return -ENOIOCTLCMD;
}
}
/* Protocol switches for the various types of TIPC sockets */
static const struct proto_ops msg_ops = {
.owner = THIS_MODULE,
.family = AF_TIPC,
.release = tipc_release,
.bind = tipc_bind,
.connect = tipc_connect,
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.getname = tipc_getname,
.poll = tipc_poll,
.ioctl = tipc_ioctl,
.listen = sock_no_listen,
.shutdown = tipc_shutdown,
.setsockopt = tipc_setsockopt,
.getsockopt = tipc_getsockopt,
.sendmsg = tipc_sendmsg,
.recvmsg = tipc_recvmsg,
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage
};
static const struct proto_ops packet_ops = {
.owner = THIS_MODULE,
.family = AF_TIPC,
.release = tipc_release,
.bind = tipc_bind,
.connect = tipc_connect,
.socketpair = sock_no_socketpair,
.accept = tipc_accept,
.getname = tipc_getname,
.poll = tipc_poll,
.ioctl = tipc_ioctl,
.listen = tipc_listen,
.shutdown = tipc_shutdown,
.setsockopt = tipc_setsockopt,
.getsockopt = tipc_getsockopt,
.sendmsg = tipc_send_packet,
.recvmsg = tipc_recvmsg,
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage
};
static const struct proto_ops stream_ops = {
.owner = THIS_MODULE,
.family = AF_TIPC,
.release = tipc_release,
.bind = tipc_bind,
.connect = tipc_connect,
.socketpair = sock_no_socketpair,
.accept = tipc_accept,
.getname = tipc_getname,
.poll = tipc_poll,
.ioctl = tipc_ioctl,
.listen = tipc_listen,
.shutdown = tipc_shutdown,
.setsockopt = tipc_setsockopt,
.getsockopt = tipc_getsockopt,
.sendmsg = tipc_send_stream,
.recvmsg = tipc_recv_stream,
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage
};
static const struct net_proto_family tipc_family_ops = {
.owner = THIS_MODULE,
.family = AF_TIPC,
.create = tipc_sk_create
};
static struct proto tipc_proto = {
.name = "TIPC",
.owner = THIS_MODULE,
.obj_size = sizeof(struct tipc_sock),
.sysctl_rmem = sysctl_tipc_rmem
};
static struct proto tipc_proto_kern = {
.name = "TIPC",
.obj_size = sizeof(struct tipc_sock),
.sysctl_rmem = sysctl_tipc_rmem
};
/**
* tipc_socket_init - initialize TIPC socket interface
*
* Returns 0 on success, errno otherwise
*/
int tipc_socket_init(void)
{
int res;
res = proto_register(&tipc_proto, 1);
if (res) {
pr_err("Failed to register TIPC protocol type\n");
goto out;
}
res = sock_register(&tipc_family_ops);
if (res) {
pr_err("Failed to register TIPC socket type\n");
proto_unregister(&tipc_proto);
goto out;
}
out:
return res;
}
/**
* tipc_socket_stop - stop TIPC socket interface
*/
void tipc_socket_stop(void)
{
sock_unregister(tipc_family_ops.family);
proto_unregister(&tipc_proto);
}