blob: 1385207a301f64f99b07e46af6c97394e8ebfda1 [file] [log] [blame]
/*
* net/tipc/socket.c: TIPC socket API
*
* Copyright (c) 2001-2007, 2012-2017, 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 <linux/rhashtable.h>
#include <linux/sched/signal.h>
#include "core.h"
#include "name_table.h"
#include "node.h"
#include "link.h"
#include "name_distr.h"
#include "socket.h"
#include "bcast.h"
#include "netlink.h"
#include "group.h"
#include "trace.h"
#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
#define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */
#define TIPC_FWD_MSG 1
#define TIPC_MAX_PORT 0xffffffff
#define TIPC_MIN_PORT 1
#define TIPC_ACK_RATE 4 /* ACK at 1/4 of of rcv window size */
enum {
TIPC_LISTEN = TCP_LISTEN,
TIPC_ESTABLISHED = TCP_ESTABLISHED,
TIPC_OPEN = TCP_CLOSE,
TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
TIPC_CONNECTING = TCP_SYN_SENT,
};
struct sockaddr_pair {
struct sockaddr_tipc sock;
struct sockaddr_tipc member;
};
/**
* struct tipc_sock - TIPC socket structure
* @sk: socket - interacts with 'port' and with user via the socket API
* @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
* @portid: unique port identity in TIPC socket hash table
* @phdr: preformatted message header used when sending messages
* #cong_links: list of congested links
* @publications: list of publications for port
* @blocking_link: address of the congested link we are currently sleeping on
* @pub_count: total # of publications port has made during its lifetime
* @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
* @cong_link_cnt: number of congested links
* @snt_unacked: # messages sent by socket, and not yet acked by peer
* @rcv_unacked: # messages read by user, but not yet acked back to peer
* @peer: 'connected' peer for dgram/rdm
* @node: hash table node
* @mc_method: cookie for use between socket and broadcast layer
* @rcu: rcu struct for tipc_sock
*/
struct tipc_sock {
struct sock sk;
u32 conn_type;
u32 conn_instance;
int published;
u32 max_pkt;
u32 portid;
struct tipc_msg phdr;
struct list_head cong_links;
struct list_head publications;
u32 pub_count;
atomic_t dupl_rcvcnt;
u16 conn_timeout;
bool probe_unacked;
u16 cong_link_cnt;
u16 snt_unacked;
u16 snd_win;
u16 peer_caps;
u16 rcv_unacked;
u16 rcv_win;
struct sockaddr_tipc peer;
struct rhash_head node;
struct tipc_mc_method mc_method;
struct rcu_head rcu;
struct tipc_group *group;
bool group_is_open;
};
static int tipc_sk_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 void tipc_sock_destruct(struct sock *sk);
static int tipc_release(struct socket *sock);
static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
bool kern);
static void tipc_sk_timeout(struct timer_list *t);
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 int tipc_sk_leave(struct tipc_sock *tsk);
static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
static int tipc_sk_insert(struct tipc_sock *tsk);
static void tipc_sk_remove(struct tipc_sock *tsk);
static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
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 const struct rhashtable_params tsk_rht_params;
static u32 tsk_own_node(struct tipc_sock *tsk)
{
return msg_prevnode(&tsk->phdr);
}
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 bool tsk_conn_cong(struct tipc_sock *tsk)
{
return tsk->snt_unacked > tsk->snd_win;
}
static u16 tsk_blocks(int len)
{
return ((len / FLOWCTL_BLK_SZ) + 1);
}
/* tsk_blocks(): translate a buffer size in bytes to number of
* advertisable blocks, taking into account the ratio truesize(len)/len
* We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
*/
static u16 tsk_adv_blocks(int len)
{
return len / FLOWCTL_BLK_SZ / 4;
}
/* tsk_inc(): increment counter for sent or received data
* - If block based flow control is not supported by peer we
* fall back to message based ditto, incrementing the counter
*/
static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
{
if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
return ((msglen / FLOWCTL_BLK_SZ) + 1);
return 1;
}
/**
* 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)
{
trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " ");
kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
}
/* tipc_sk_respond() : send response message back to sender
*/
static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
{
u32 selector;
u32 dnode;
u32 onode = tipc_own_addr(sock_net(sk));
if (!tipc_msg_reverse(onode, &skb, err))
return;
trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!");
dnode = msg_destnode(buf_msg(skb));
selector = msg_origport(buf_msg(skb));
tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
}
/**
* 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 *skb;
while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT);
}
static bool tipc_sk_connected(struct sock *sk)
{
return sk->sk_state == TIPC_ESTABLISHED;
}
/* tipc_sk_type_connectionless - check if the socket is datagram socket
* @sk: socket
*
* Returns true if connection less, false otherwise
*/
static bool tipc_sk_type_connectionless(struct sock *sk)
{
return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
}
/* 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)
{
struct sock *sk = &tsk->sk;
u32 self = tipc_own_addr(sock_net(sk));
u32 peer_port = tsk_peer_port(tsk);
u32 orig_node, peer_node;
if (unlikely(!tipc_sk_connected(sk)))
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 == self)
return true;
if (!peer_node && orig_node == self)
return true;
return false;
}
/* tipc_set_sk_state - set the sk_state of the socket
* @sk: socket
*
* Caller must hold socket lock
*
* Returns 0 on success, errno otherwise
*/
static int tipc_set_sk_state(struct sock *sk, int state)
{
int oldsk_state = sk->sk_state;
int res = -EINVAL;
switch (state) {
case TIPC_OPEN:
res = 0;
break;
case TIPC_LISTEN:
case TIPC_CONNECTING:
if (oldsk_state == TIPC_OPEN)
res = 0;
break;
case TIPC_ESTABLISHED:
if (oldsk_state == TIPC_CONNECTING ||
oldsk_state == TIPC_OPEN)
res = 0;
break;
case TIPC_DISCONNECTING:
if (oldsk_state == TIPC_CONNECTING ||
oldsk_state == TIPC_ESTABLISHED)
res = 0;
break;
}
if (!res)
sk->sk_state = state;
return res;
}
static int tipc_sk_sock_err(struct socket *sock, long *timeout)
{
struct sock *sk = sock->sk;
int err = sock_error(sk);
int typ = sock->type;
if (err)
return err;
if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
if (sk->sk_state == TIPC_DISCONNECTING)
return -EPIPE;
else if (!tipc_sk_connected(sk))
return -ENOTCONN;
}
if (!*timeout)
return -EAGAIN;
if (signal_pending(current))
return sock_intr_errno(*timeout);
return 0;
}
#define tipc_wait_for_cond(sock_, timeo_, condition_) \
({ \
DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
struct sock *sk_; \
int rc_; \
\
while ((rc_ = !(condition_))) { \
/* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \
smp_rmb(); \
sk_ = (sock_)->sk; \
rc_ = tipc_sk_sock_err((sock_), timeo_); \
if (rc_) \
break; \
add_wait_queue(sk_sleep(sk_), &wait_); \
release_sock(sk_); \
*(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
sched_annotate_sleep(); \
lock_sock(sk_); \
remove_wait_queue(sk_sleep(sk_), &wait_); \
} \
rc_; \
})
/**
* 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;
struct sock *sk;
struct tipc_sock *tsk;
struct tipc_msg *msg;
/* Validate arguments */
if (unlikely(protocol != 0))
return -EPROTONOSUPPORT;
switch (sock->type) {
case SOCK_STREAM:
ops = &stream_ops;
break;
case SOCK_SEQPACKET:
ops = &packet_ops;
break;
case SOCK_DGRAM:
case SOCK_RDM:
ops = &msg_ops;
break;
default:
return -EPROTOTYPE;
}
/* Allocate socket's protocol area */
sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
if (sk == NULL)
return -ENOMEM;
tsk = tipc_sk(sk);
tsk->max_pkt = MAX_PKT_DEFAULT;
INIT_LIST_HEAD(&tsk->publications);
INIT_LIST_HEAD(&tsk->cong_links);
msg = &tsk->phdr;
/* Finish initializing socket data structures */
sock->ops = ops;
sock_init_data(sock, sk);
tipc_set_sk_state(sk, TIPC_OPEN);
if (tipc_sk_insert(tsk)) {
pr_warn("Socket create failed; port number exhausted\n");
return -EINVAL;
}
/* Ensure tsk is visible before we read own_addr. */
smp_mb();
tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE,
TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
msg_set_origport(msg, tsk->portid);
timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
sk->sk_shutdown = 0;
sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
sk->sk_rcvbuf = sysctl_tipc_rmem[1];
sk->sk_data_ready = tipc_data_ready;
sk->sk_write_space = tipc_write_space;
sk->sk_destruct = tipc_sock_destruct;
tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
tsk->group_is_open = true;
atomic_set(&tsk->dupl_rcvcnt, 0);
/* Start out with safe limits until we receive an advertised window */
tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
tsk->rcv_win = tsk->snd_win;
if (tipc_sk_type_connectionless(sk)) {
tsk_set_unreturnable(tsk, true);
if (sock->type == SOCK_DGRAM)
tsk_set_unreliable(tsk, true);
__skb_queue_head_init(&tsk->mc_method.deferredq);
}
trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " ");
return 0;
}
static void tipc_sk_callback(struct rcu_head *head)
{
struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
sock_put(&tsk->sk);
}
/* Caller should hold socket lock for the socket. */
static void __tipc_shutdown(struct socket *sock, int error)
{
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(sk);
struct net *net = sock_net(sk);
long timeout = CONN_TIMEOUT_DEFAULT;
u32 dnode = tsk_peer_node(tsk);
struct sk_buff *skb;
/* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
!tsk_conn_cong(tsk)));
/* Remove any pending SYN message */
__skb_queue_purge(&sk->sk_write_queue);
/* Reject all unreceived messages, except on an active connection
* (which disconnects locally & sends a 'FIN+' to peer).
*/
while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
if (TIPC_SKB_CB(skb)->bytes_read) {
kfree_skb(skb);
continue;
}
if (!tipc_sk_type_connectionless(sk) &&
sk->sk_state != TIPC_DISCONNECTING) {
tipc_set_sk_state(sk, TIPC_DISCONNECTING);
tipc_node_remove_conn(net, dnode, tsk->portid);
}
tipc_sk_respond(sk, skb, error);
}
if (tipc_sk_type_connectionless(sk))
return;
if (sk->sk_state != TIPC_DISCONNECTING) {
skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
tsk_own_node(tsk), tsk_peer_port(tsk),
tsk->portid, error);
if (skb)
tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
tipc_node_remove_conn(net, dnode, tsk->portid);
tipc_set_sk_state(sk, TIPC_DISCONNECTING);
}
}
/**
* 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;
/*
* 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);
trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " ");
__tipc_shutdown(sock, TIPC_ERR_NO_PORT);
sk->sk_shutdown = SHUTDOWN_MASK;
tipc_sk_leave(tsk);
tipc_sk_withdraw(tsk, 0, NULL);
__skb_queue_purge(&tsk->mc_method.deferredq);
sk_stop_timer(sk, &sk->sk_timer);
tipc_sk_remove(tsk);
sock_orphan(sk);
/* Reject any messages that accumulated in backlog queue */
release_sock(sk);
tipc_dest_list_purge(&tsk->cong_links);
tsk->cong_link_cnt = 0;
call_rcu(&tsk->rcu, tipc_sk_callback);
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 (tsk->group) {
res = -EACCES;
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 peer)
{
struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(sk);
memset(addr, 0, sizeof(*addr));
if (peer) {
if ((!tipc_sk_connected(sk)) &&
((peer != 2) || (sk->sk_state != TIPC_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->portid;
addr->addr.id.node = tipc_own_addr(sock_net(sk));
}
addr->addrtype = TIPC_ADDR_ID;
addr->family = AF_TIPC;
addr->scope = 0;
addr->addr.name.domain = 0;
return sizeof(*addr);
}
/**
* 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 ...
*
* 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 __poll_t tipc_poll(struct file *file, struct socket *sock,
poll_table *wait)
{
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(sk);
__poll_t revents = 0;
sock_poll_wait(file, sock, wait);
trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " ");
if (sk->sk_shutdown & RCV_SHUTDOWN)
revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
if (sk->sk_shutdown == SHUTDOWN_MASK)
revents |= EPOLLHUP;
switch (sk->sk_state) {
case TIPC_ESTABLISHED:
case TIPC_CONNECTING:
if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
revents |= EPOLLOUT;
/* fall through */
case TIPC_LISTEN:
if (!skb_queue_empty(&sk->sk_receive_queue))
revents |= EPOLLIN | EPOLLRDNORM;
break;
case TIPC_OPEN:
if (tsk->group_is_open && !tsk->cong_link_cnt)
revents |= EPOLLOUT;
if (!tipc_sk_type_connectionless(sk))
break;
if (skb_queue_empty(&sk->sk_receive_queue))
break;
revents |= EPOLLIN | EPOLLRDNORM;
break;
case TIPC_DISCONNECTING:
revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
break;
}
return revents;
}
/**
* tipc_sendmcast - send multicast message
* @sock: socket structure
* @seq: destination address
* @msg: message to send
* @dlen: length of data to send
* @timeout: 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 msghdr *msg, size_t dlen, long timeout)
{
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(sk);
struct tipc_msg *hdr = &tsk->phdr;
struct net *net = sock_net(sk);
int mtu = tipc_bcast_get_mtu(net);
struct tipc_mc_method *method = &tsk->mc_method;
struct sk_buff_head pkts;
struct tipc_nlist dsts;
int rc;
if (tsk->group)
return -EACCES;
/* Block or return if any destination link is congested */
rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
if (unlikely(rc))
return rc;
/* Lookup destination nodes */
tipc_nlist_init(&dsts, tipc_own_addr(net));
tipc_nametbl_lookup_dst_nodes(net, seq->type, seq->lower,
seq->upper, &dsts);
if (!dsts.local && !dsts.remote)
return -EHOSTUNREACH;
/* Build message header */
msg_set_type(hdr, TIPC_MCAST_MSG);
msg_set_hdr_sz(hdr, MCAST_H_SIZE);
msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
msg_set_destport(hdr, 0);
msg_set_destnode(hdr, 0);
msg_set_nametype(hdr, seq->type);
msg_set_namelower(hdr, seq->lower);
msg_set_nameupper(hdr, seq->upper);
/* Build message as chain of buffers */
skb_queue_head_init(&pkts);
rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
/* Send message if build was successful */
if (unlikely(rc == dlen)) {
trace_tipc_sk_sendmcast(sk, skb_peek(&pkts),
TIPC_DUMP_SK_SNDQ, " ");
rc = tipc_mcast_xmit(net, &pkts, method, &dsts,
&tsk->cong_link_cnt);
}
tipc_nlist_purge(&dsts);
return rc ? rc : dlen;
}
/**
* tipc_send_group_msg - send a message to a member in the group
* @net: network namespace
* @m: message to send
* @mb: group member
* @dnode: destination node
* @dport: destination port
* @dlen: total length of message data
*/
static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
struct msghdr *m, struct tipc_member *mb,
u32 dnode, u32 dport, int dlen)
{
u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
struct tipc_mc_method *method = &tsk->mc_method;
int blks = tsk_blocks(GROUP_H_SIZE + dlen);
struct tipc_msg *hdr = &tsk->phdr;
struct sk_buff_head pkts;
int mtu, rc;
/* Complete message header */
msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
msg_set_hdr_sz(hdr, GROUP_H_SIZE);
msg_set_destport(hdr, dport);
msg_set_destnode(hdr, dnode);
msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
/* Build message as chain of buffers */
skb_queue_head_init(&pkts);
mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
if (unlikely(rc != dlen))
return rc;
/* Send message */
rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
if (unlikely(rc == -ELINKCONG)) {
tipc_dest_push(&tsk->cong_links, dnode, 0);
tsk->cong_link_cnt++;
}
/* Update send window */
tipc_group_update_member(mb, blks);
/* A broadcast sent within next EXPIRE period must follow same path */
method->rcast = true;
method->mandatory = true;
return dlen;
}
/**
* tipc_send_group_unicast - send message to a member in the group
* @sock: socket structure
* @m: message to send
* @dlen: total length of message data
* @timeout: 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_send_group_unicast(struct socket *sock, struct msghdr *m,
int dlen, long timeout)
{
struct sock *sk = sock->sk;
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
int blks = tsk_blocks(GROUP_H_SIZE + dlen);
struct tipc_sock *tsk = tipc_sk(sk);
struct net *net = sock_net(sk);
struct tipc_member *mb = NULL;
u32 node, port;
int rc;
node = dest->addr.id.node;
port = dest->addr.id.ref;
if (!port && !node)
return -EHOSTUNREACH;
/* Block or return if destination link or member is congested */
rc = tipc_wait_for_cond(sock, &timeout,
!tipc_dest_find(&tsk->cong_links, node, 0) &&
tsk->group &&
!tipc_group_cong(tsk->group, node, port, blks,
&mb));
if (unlikely(rc))
return rc;
if (unlikely(!mb))
return -EHOSTUNREACH;
rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
return rc ? rc : dlen;
}
/**
* tipc_send_group_anycast - send message to any member with given identity
* @sock: socket structure
* @m: message to send
* @dlen: total length of message data
* @timeout: 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_send_group_anycast(struct socket *sock, struct msghdr *m,
int dlen, long timeout)
{
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(sk);
struct list_head *cong_links = &tsk->cong_links;
int blks = tsk_blocks(GROUP_H_SIZE + dlen);
struct tipc_msg *hdr = &tsk->phdr;
struct tipc_member *first = NULL;
struct tipc_member *mbr = NULL;
struct net *net = sock_net(sk);
u32 node, port, exclude;
struct list_head dsts;
u32 type, inst, scope;
int lookups = 0;
int dstcnt, rc;
bool cong;
INIT_LIST_HEAD(&dsts);
type = msg_nametype(hdr);
inst = dest->addr.name.name.instance;
scope = msg_lookup_scope(hdr);
while (++lookups < 4) {
exclude = tipc_group_exclude(tsk->group);
first = NULL;
/* Look for a non-congested destination member, if any */
while (1) {
if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
&dstcnt, exclude, false))
return -EHOSTUNREACH;
tipc_dest_pop(&dsts, &node, &port);
cong = tipc_group_cong(tsk->group, node, port, blks,
&mbr);
if (!cong)
break;
if (mbr == first)
break;
if (!first)
first = mbr;
}
/* Start over if destination was not in member list */
if (unlikely(!mbr))
continue;
if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
break;
/* Block or return if destination link or member is congested */
rc = tipc_wait_for_cond(sock, &timeout,
!tipc_dest_find(cong_links, node, 0) &&
tsk->group &&
!tipc_group_cong(tsk->group, node, port,
blks, &mbr));
if (unlikely(rc))
return rc;
/* Send, unless destination disappeared while waiting */
if (likely(mbr))
break;
}
if (unlikely(lookups >= 4))
return -EHOSTUNREACH;
rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
return rc ? rc : dlen;
}
/**
* tipc_send_group_bcast - send message to all members in communication group
* @sk: socket structure
* @m: message to send
* @dlen: total length of message data
* @timeout: 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_send_group_bcast(struct socket *sock, struct msghdr *m,
int dlen, long timeout)
{
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
struct sock *sk = sock->sk;
struct net *net = sock_net(sk);
struct tipc_sock *tsk = tipc_sk(sk);
struct tipc_nlist *dsts;
struct tipc_mc_method *method = &tsk->mc_method;
bool ack = method->mandatory && method->rcast;
int blks = tsk_blocks(MCAST_H_SIZE + dlen);
struct tipc_msg *hdr = &tsk->phdr;
int mtu = tipc_bcast_get_mtu(net);
struct sk_buff_head pkts;
int rc = -EHOSTUNREACH;
/* Block or return if any destination link or member is congested */
rc = tipc_wait_for_cond(sock, &timeout,
!tsk->cong_link_cnt && tsk->group &&
!tipc_group_bc_cong(tsk->group, blks));
if (unlikely(rc))
return rc;
dsts = tipc_group_dests(tsk->group);
if (!dsts->local && !dsts->remote)
return -EHOSTUNREACH;
/* Complete message header */
if (dest) {
msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
msg_set_nameinst(hdr, dest->addr.name.name.instance);
} else {
msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
msg_set_nameinst(hdr, 0);
}
msg_set_hdr_sz(hdr, GROUP_H_SIZE);
msg_set_destport(hdr, 0);
msg_set_destnode(hdr, 0);
msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group));
/* Avoid getting stuck with repeated forced replicasts */
msg_set_grp_bc_ack_req(hdr, ack);
/* Build message as chain of buffers */
skb_queue_head_init(&pkts);
rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
if (unlikely(rc != dlen))
return rc;
/* Send message */
rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
if (unlikely(rc))
return rc;
/* Update broadcast sequence number and send windows */
tipc_group_update_bc_members(tsk->group, blks, ack);
/* Broadcast link is now free to choose method for next broadcast */
method->mandatory = false;
method->expires = jiffies;
return dlen;
}
/**
* tipc_send_group_mcast - send message to all members with given identity
* @sock: socket structure
* @m: message to send
* @dlen: total length of message data
* @timeout: 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_send_group_mcast(struct socket *sock, struct msghdr *m,
int dlen, long timeout)
{
struct sock *sk = sock->sk;
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
struct tipc_sock *tsk = tipc_sk(sk);
struct tipc_group *grp = tsk->group;
struct tipc_msg *hdr = &tsk->phdr;
struct net *net = sock_net(sk);
u32 type, inst, scope, exclude;
struct list_head dsts;
u32 dstcnt;
INIT_LIST_HEAD(&dsts);
type = msg_nametype(hdr);
inst = dest->addr.name.name.instance;
scope = msg_lookup_scope(hdr);
exclude = tipc_group_exclude(grp);
if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
&dstcnt, exclude, true))
return -EHOSTUNREACH;
if (dstcnt == 1) {
tipc_dest_pop(&dsts, &dest->addr.id.node, &dest->addr.id.ref);
return tipc_send_group_unicast(sock, m, dlen, timeout);
}
tipc_dest_list_purge(&dsts);
return tipc_send_group_bcast(sock, m, dlen, timeout);
}
/**
* tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
* @arrvq: queue with arriving messages, to be cloned after destination lookup
* @inputq: queue with cloned messages, delivered to socket after dest lookup
*
* Multi-threaded: parallel calls with reference to same queues may occur
*/
void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
struct sk_buff_head *inputq)
{
u32 self = tipc_own_addr(net);
u32 type, lower, upper, scope;
struct sk_buff *skb, *_skb;
u32 portid, onode;
struct sk_buff_head tmpq;
struct list_head dports;
struct tipc_msg *hdr;
int user, mtyp, hlen;
bool exact;
__skb_queue_head_init(&tmpq);
INIT_LIST_HEAD(&dports);
skb = tipc_skb_peek(arrvq, &inputq->lock);
for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
hdr = buf_msg(skb);
user = msg_user(hdr);
mtyp = msg_type(hdr);
hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
onode = msg_orignode(hdr);
type = msg_nametype(hdr);
if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
spin_lock_bh(&inputq->lock);
if (skb_peek(arrvq) == skb) {
__skb_dequeue(arrvq);
__skb_queue_tail(inputq, skb);
}
kfree_skb(skb);
spin_unlock_bh(&inputq->lock);
continue;
}
/* Group messages require exact scope match */
if (msg_in_group(hdr)) {
lower = 0;
upper = ~0;
scope = msg_lookup_scope(hdr);
exact = true;
} else {
/* TIPC_NODE_SCOPE means "any scope" in this context */
if (onode == self)
scope = TIPC_NODE_SCOPE;
else
scope = TIPC_CLUSTER_SCOPE;
exact = false;
lower = msg_namelower(hdr);
upper = msg_nameupper(hdr);
}
/* Create destination port list: */
tipc_nametbl_mc_lookup(net, type, lower, upper,
scope, exact, &dports);
/* Clone message per destination */
while (tipc_dest_pop(&dports, NULL, &portid)) {
_skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
if (_skb) {
msg_set_destport(buf_msg(_skb), portid);
__skb_queue_tail(&tmpq, _skb);
continue;
}
pr_warn("Failed to clone mcast rcv buffer\n");
}
/* Append to inputq if not already done by other thread */
spin_lock_bh(&inputq->lock);
if (skb_peek(arrvq) == skb) {
skb_queue_splice_tail_init(&tmpq, inputq);
kfree_skb(__skb_dequeue(arrvq));
}
spin_unlock_bh(&inputq->lock);
__skb_queue_purge(&tmpq);
kfree_skb(skb);
}
tipc_sk_rcv(net, inputq);
}
/**
* tipc_sk_conn_proto_rcv - receive a connection mng protocol message
* @tsk: receiving socket
* @skb: pointer to message buffer.
*/
static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
struct sk_buff_head *inputq,
struct sk_buff_head *xmitq)
{
struct tipc_msg *hdr = buf_msg(skb);
u32 onode = tsk_own_node(tsk);
struct sock *sk = &tsk->sk;
int mtyp = msg_type(hdr);
bool conn_cong;
/* Ignore if connection cannot be validated: */
if (!tsk_peer_msg(tsk, hdr)) {
trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!");
goto exit;
}
if (unlikely(msg_errcode(hdr))) {
tipc_set_sk_state(sk, TIPC_DISCONNECTING);
tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
tsk_peer_port(tsk));
sk->sk_state_change(sk);
/* State change is ignored if socket already awake,
* - convert msg to abort msg and add to inqueue
*/
msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE);
msg_set_type(hdr, TIPC_CONN_MSG);
msg_set_size(hdr, BASIC_H_SIZE);
msg_set_hdr_sz(hdr, BASIC_H_SIZE);
__skb_queue_tail(inputq, skb);
return;
}
tsk->probe_unacked = false;
if (mtyp == CONN_PROBE) {
msg_set_type(hdr, CONN_PROBE_REPLY);
if (tipc_msg_reverse(onode, &skb, TIPC_OK))
__skb_queue_tail(xmitq, skb);
return;
} else if (mtyp == CONN_ACK) {
conn_cong = tsk_conn_cong(tsk);
tsk->snt_unacked -= msg_conn_ack(hdr);
if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
tsk->snd_win = msg_adv_win(hdr);
if (conn_cong)
sk->sk_write_space(sk);
} else if (mtyp != CONN_PROBE_REPLY) {
pr_warn("Received unknown CONN_PROTO msg\n");
}
exit:
kfree_skb(skb);
}
/**
* tipc_sendmsg - send message in connectionless manner
* @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 socket *sock,
struct msghdr *m, size_t dsz)
{
struct sock *sk = sock->sk;
int ret;
lock_sock(sk);
ret = __tipc_sendmsg(sock, m, dsz);
release_sock(sk);
return ret;
}
static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
{
struct sock *sk = sock->sk;
struct net *net = sock_net(sk);
struct tipc_sock *tsk = tipc_sk(sk);
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
struct list_head *clinks = &tsk->cong_links;
bool syn = !tipc_sk_type_connectionless(sk);
struct tipc_group *grp = tsk->group;
struct tipc_msg *hdr = &tsk->phdr;
struct tipc_name_seq *seq;
struct sk_buff_head pkts;
u32 dport, dnode = 0;
u32 type, inst;
int mtu, rc;
if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
return -EMSGSIZE;
if (likely(dest)) {
if (unlikely(m->msg_namelen < sizeof(*dest)))
return -EINVAL;
if (unlikely(dest->family != AF_TIPC))
return -EINVAL;
}
if (grp) {
if (!dest)
return tipc_send_group_bcast(sock, m, dlen, timeout);
if (dest->addrtype == TIPC_ADDR_NAME)
return tipc_send_group_anycast(sock, m, dlen, timeout);
if (dest->addrtype == TIPC_ADDR_ID)
return tipc_send_group_unicast(sock, m, dlen, timeout);
if (dest->addrtype == TIPC_ADDR_MCAST)
return tipc_send_group_mcast(sock, m, dlen, timeout);
return -EINVAL;
}
if (unlikely(!dest)) {
dest = &tsk->peer;
if (!syn && dest->family != AF_TIPC)
return -EDESTADDRREQ;
}
if (unlikely(syn)) {
if (sk->sk_state == TIPC_LISTEN)
return -EPIPE;
if (sk->sk_state != TIPC_OPEN)
return -EISCONN;
if (tsk->published)
return -EOPNOTSUPP;
if (dest->addrtype == TIPC_ADDR_NAME) {
tsk->conn_type = dest->addr.name.name.type;
tsk->conn_instance = dest->addr.name.name.instance;
}
msg_set_syn(hdr, 1);
}
seq = &dest->addr.nameseq;
if (dest->addrtype == TIPC_ADDR_MCAST)
return tipc_sendmcast(sock, seq, m, dlen, timeout);
if (dest->addrtype == TIPC_ADDR_NAME) {
type = dest->addr.name.name.type;
inst = dest->addr.name.name.instance;
dnode = dest->addr.name.domain;
msg_set_type(hdr, TIPC_NAMED_MSG);
msg_set_hdr_sz(hdr, NAMED_H_SIZE);
msg_set_nametype(hdr, type);
msg_set_nameinst(hdr, inst);
msg_set_lookup_scope(hdr, tipc_node2scope(dnode));
dport = tipc_nametbl_translate(net, type, inst, &dnode);
msg_set_destnode(hdr, dnode);
msg_set_destport(hdr, dport);
if (unlikely(!dport && !dnode))
return -EHOSTUNREACH;
} else if (dest->addrtype == TIPC_ADDR_ID) {
dnode = dest->addr.id.node;
msg_set_type(hdr, TIPC_DIRECT_MSG);
msg_set_lookup_scope(hdr, 0);
msg_set_destnode(hdr, dnode);
msg_set_destport(hdr, dest->addr.id.ref);
msg_set_hdr_sz(hdr, BASIC_H_SIZE);
} else {
return -EINVAL;
}
/* Block or return if destination link is congested */
rc = tipc_wait_for_cond(sock, &timeout,
!tipc_dest_find(clinks, dnode, 0));
if (unlikely(rc))
return rc;
skb_queue_head_init(&pkts);
mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
if (unlikely(rc != dlen))
return rc;
if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue)))
return -ENOMEM;
trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " ");
rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
if (unlikely(rc == -ELINKCONG)) {
tipc_dest_push(clinks, dnode, 0);
tsk->cong_link_cnt++;
rc = 0;
}
if (unlikely(syn && !rc))
tipc_set_sk_state(sk, TIPC_CONNECTING);
return rc ? rc : dlen;
}
/**
* tipc_sendstream - send stream-oriented data
* @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_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
{
struct sock *sk = sock->sk;
int ret;
lock_sock(sk);
ret = __tipc_sendstream(sock, m, dsz);
release_sock(sk);
return ret;
}
static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
{
struct sock *sk = sock->sk;
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
struct tipc_sock *tsk = tipc_sk(sk);
struct tipc_msg *hdr = &tsk->phdr;
struct net *net = sock_net(sk);
struct sk_buff_head pkts;
u32 dnode = tsk_peer_node(tsk);
int send, sent = 0;
int rc = 0;
skb_queue_head_init(&pkts);
if (unlikely(dlen > INT_MAX))
return -EMSGSIZE;
/* Handle implicit connection setup */
if (unlikely(dest)) {
rc = __tipc_sendmsg(sock, m, dlen);
if (dlen && dlen == rc) {
tsk->peer_caps = tipc_node_get_capabilities(net, dnode);
tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
}
return rc;
}
do {
rc = tipc_wait_for_cond(sock, &timeout,
(!tsk->cong_link_cnt &&
!tsk_conn_cong(tsk) &&
tipc_sk_connected(sk)));
if (unlikely(rc))
break;
send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
rc = tipc_msg_build(hdr, m, sent, send, tsk->max_pkt, &pkts);
if (unlikely(rc != send))
break;
trace_tipc_sk_sendstream(sk, skb_peek(&pkts),
TIPC_DUMP_SK_SNDQ, " ");
rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
if (unlikely(rc == -ELINKCONG)) {
tsk->cong_link_cnt = 1;
rc = 0;
}
if (likely(!rc)) {
tsk->snt_unacked += tsk_inc(tsk, send + MIN_H_SIZE);
sent += send;
}
} while (sent < dlen && !rc);
return sent ? sent : rc;
}
/**
* tipc_send_packet - send a connection-oriented message
* @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 socket *sock, struct msghdr *m, size_t dsz)
{
if (dsz > TIPC_MAX_USER_MSG_SIZE)
return -EMSGSIZE;
return tipc_sendstream(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 sock *sk = &tsk->sk;
struct net *net = sock_net(sk);
struct tipc_msg *msg = &tsk->phdr;
msg_set_syn(msg, 0);
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);
sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
tipc_set_sk_state(sk, TIPC_ESTABLISHED);
tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid);
tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
__skb_queue_purge(&sk->sk_write_queue);
if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
return;
/* Fall back to message based flow control */
tsk->rcv_win = FLOWCTL_MSG_WIN;
tsk->snd_win = FLOWCTL_MSG_WIN;
}
/**
* tipc_sk_set_orig_addr - capture sender's address for received message
* @m: descriptor for message info
* @hdr: received message header
*
* Note: Address is not captured if not requested by receiver.
*/
static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
{
DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
struct tipc_msg *hdr = buf_msg(skb);
if (!srcaddr)
return;
srcaddr->sock.family = AF_TIPC;
srcaddr->sock.addrtype = TIPC_ADDR_ID;
srcaddr->sock.scope = 0;
srcaddr->sock.addr.id.ref = msg_origport(hdr);
srcaddr->sock.addr.id.node = msg_orignode(hdr);
srcaddr->sock.addr.name.domain = 0;
m->msg_namelen = sizeof(struct sockaddr_tipc);
if (!msg_in_group(hdr))
return;
/* Group message users may also want to know sending member's id */
srcaddr->member.family = AF_TIPC;
srcaddr->member.addrtype = TIPC_ADDR_NAME;
srcaddr->member.scope = 0;
srcaddr->member.addr.name.name.type = msg_nametype(hdr);
srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
srcaddr->member.addr.name.domain = 0;
m->msg_namelen = sizeof(*srcaddr);
}
/**
* tipc_sk_anc_data_recv - optionally capture ancillary data for received message
* @m: descriptor for message info
* @skb: received message buffer
* @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 sk_buff *skb,
struct tipc_sock *tsk)
{
struct tipc_msg *msg;
u32 anc_data[3];
u32 err;
u32 dest_type;
int has_name;
int res;
if (likely(m->msg_controllen == 0))
return 0;
msg = buf_msg(skb);
/* 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]) {
if (skb_linearize(skb))
return -ENOMEM;
msg = buf_msg(skb);
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)
{
struct sock *sk = &tsk->sk;
struct net *net = sock_net(sk);
struct sk_buff *skb = NULL;
struct tipc_msg *msg;
u32 peer_port = tsk_peer_port(tsk);
u32 dnode = tsk_peer_node(tsk);
if (!tipc_sk_connected(sk))
return;
skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
dnode, tsk_own_node(tsk), peer_port,
tsk->portid, TIPC_OK);
if (!skb)
return;
msg = buf_msg(skb);
msg_set_conn_ack(msg, tsk->rcv_unacked);
tsk->rcv_unacked = 0;
/* Adjust to and advertize the correct window limit */
if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
msg_set_adv_win(msg, tsk->rcv_win);
}
tipc_node_xmit_skb(net, skb, dnode, msg_link_selector(msg));
}
static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
{
struct sock *sk = sock->sk;
DEFINE_WAIT_FUNC(wait, woken_wake_function);
long timeo = *timeop;
int err = sock_error(sk);
if (err)
return err;
for (;;) {
if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
if (sk->sk_shutdown & RCV_SHUTDOWN) {
err = -ENOTCONN;
break;
}
add_wait_queue(sk_sleep(sk), &wait);
release_sock(sk);
timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
sched_annotate_sleep();
lock_sock(sk);
remove_wait_queue(sk_sleep(sk), &wait);
}
err = 0;
if (!skb_queue_empty(&sk->sk_receive_queue))
break;
err = -EAGAIN;
if (!timeo)
break;
err = sock_intr_errno(timeo);
if (signal_pending(current))
break;
err = sock_error(sk);
if (err)
break;
}
*timeop = timeo;
return err;
}
/**
* tipc_recvmsg - receive packet-oriented message
* @m: descriptor for message info
* @buflen: length 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 socket *sock, struct msghdr *m,
size_t buflen, int flags)
{
struct sock *sk = sock->sk;
bool connected = !tipc_sk_type_connectionless(sk);
struct tipc_sock *tsk = tipc_sk(sk);
int rc, err, hlen, dlen, copy;
struct sk_buff_head xmitq;
struct tipc_msg *hdr;
struct sk_buff *skb;
bool grp_evt;
long timeout;
/* Catch invalid receive requests */
if (unlikely(!buflen))
return -EINVAL;
lock_sock(sk);
if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
rc = -ENOTCONN;
goto exit;
}
timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
/* Step rcv queue to first msg with data or error; wait if necessary */
do {
rc = tipc_wait_for_rcvmsg(sock, &timeout);
if (unlikely(rc))
goto exit;
skb = skb_peek(&sk->sk_receive_queue);
hdr = buf_msg(skb);
dlen = msg_data_sz(hdr);
hlen = msg_hdr_sz(hdr);
err = msg_errcode(hdr);
grp_evt = msg_is_grp_evt(hdr);
if (likely(dlen || err))
break;
tsk_advance_rx_queue(sk);
} while (1);
/* Collect msg meta data, including error code and rejected data */
tipc_sk_set_orig_addr(m, skb);
rc = tipc_sk_anc_data_recv(m, skb, tsk);
if (unlikely(rc))
goto exit;
hdr = buf_msg(skb);
/* Capture data if non-error msg, otherwise just set return value */
if (likely(!err)) {
copy = min_t(int, dlen, buflen);
if (unlikely(copy != dlen))
m->msg_flags |= MSG_TRUNC;
rc = skb_copy_datagram_msg(skb, hlen, m, copy);
} else {
copy = 0;
rc = 0;
if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control)
rc = -ECONNRESET;
}
if (unlikely(rc))
goto exit;
/* Mark message as group event if applicable */
if (unlikely(grp_evt)) {
if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
m->msg_flags |= MSG_EOR;
m->msg_flags |= MSG_OOB;
copy = 0;
}
/* Caption of data or error code/rejected data was successful */
if (unlikely(flags & MSG_PEEK))
goto exit;
/* Send group flow control advertisement when applicable */
if (tsk->group && msg_in_group(hdr) && !grp_evt) {
skb_queue_head_init(&xmitq);
tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
msg_orignode(hdr), msg_origport(hdr),
&xmitq);
tipc_node_distr_xmit(sock_net(sk), &xmitq);
}
tsk_advance_rx_queue(sk);
if (likely(!connected))
goto exit;
/* Send connection flow control advertisement when applicable */
tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
tipc_sk_send_ack(tsk);
exit:
release_sock(sk);
return rc ? rc : copy;
}
/**
* tipc_recvstream - receive stream-oriented data
* @m: descriptor for message info
* @buflen: 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_recvstream(struct socket *sock, struct msghdr *m,
size_t buflen, int flags)
{
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(sk);
struct sk_buff *skb;
struct tipc_msg *hdr;
struct tipc_skb_cb *skb_cb;
bool peek = flags & MSG_PEEK;
int offset, required, copy, copied = 0;
int hlen, dlen, err, rc;
long timeout;
/* Catch invalid receive attempts */
if (unlikely(!buflen))
return -EINVAL;
lock_sock(sk);
if (unlikely(sk->sk_state == TIPC_OPEN)) {
rc = -ENOTCONN;
goto exit;
}
required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
do {
/* Look at first msg in receive queue; wait if necessary */
rc = tipc_wait_for_rcvmsg(sock, &timeout);
if (unlikely(rc))
break;
skb = skb_peek(&sk->sk_receive_queue);
skb_cb = TIPC_SKB_CB(skb);
hdr = buf_msg(skb);
dlen = msg_data_sz(hdr);
hlen = msg_hdr_sz(hdr);
err = msg_errcode(hdr);
/* Discard any empty non-errored (SYN-) message */
if (unlikely(!dlen && !err)) {
tsk_advance_rx_queue(sk);
continue;
}
/* Collect msg meta data, incl. error code and rejected data */
if (!copied) {
tipc_sk_set_orig_addr(m, skb);
rc = tipc_sk_anc_data_recv(m, skb, tsk);
if (rc)
break;
hdr = buf_msg(skb);
}
/* Copy data if msg ok, otherwise return error/partial data */
if (likely(!err)) {
offset = skb_cb->bytes_read;
copy = min_t(int, dlen - offset, buflen - copied);
rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
if (unlikely(rc))
break;
copied += copy;
offset += copy;
if (unlikely(offset < dlen)) {
if (!peek)
skb_cb->bytes_read = offset;
break;
}
} else {
rc = 0;
if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
rc = -ECONNRESET;
if (copied || rc)
break;
}
if (unlikely(peek))
break;
tsk_advance_rx_queue(sk);
/* Send connection flow control advertisement when applicable */
tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
if (unlikely(tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE))
tipc_sk_send_ack(tsk);
/* Exit if all requested data or FIN/error received */
if (copied == buflen || err)
break;
} while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
exit:
release_sock(sk);
return copied ? copied : rc;
}
/**
* 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 (skwq_has_sleeper(wq))
wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
EPOLLWRNORM | EPOLLWRBAND);
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 (skwq_has_sleeper(wq))
wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
EPOLLRDNORM | EPOLLRDBAND);
rcu_read_unlock();
}
static void tipc_sock_destruct(struct sock *sk)
{
__skb_queue_purge(&sk->sk_receive_queue);
}
static void tipc_sk_proto_rcv(struct sock *sk,
struct sk_buff_head *inputq,
struct sk_buff_head *xmitq)
{
struct sk_buff *skb = __skb_dequeue(inputq);
struct tipc_sock *tsk = tipc_sk(sk);
struct tipc_msg *hdr = buf_msg(skb);
struct tipc_group *grp = tsk->group;
bool wakeup = false;
switch (msg_user(hdr)) {
case CONN_MANAGER:
tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq);
return;
case SOCK_WAKEUP:
tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
/* coupled with smp_rmb() in tipc_wait_for_cond() */
smp_wmb();
tsk->cong_link_cnt--;
wakeup = true;
break;
case GROUP_PROTOCOL:
tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
break;
case TOP_SRV:
tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
hdr, inputq, xmitq);
break;
default:
break;
}
if (wakeup)
sk->sk_write_space(sk);
kfree_skb(skb);
}
/**
* tipc_sk_filter_connect - check incoming message for a connection-based socket
* @tsk: TIPC socket
* @skb: pointer to message buffer.
* Returns true if message should be added to receive queue, false otherwise
*/
static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb)
{
struct sock *sk = &tsk->sk;
struct net *net = sock_net(sk);
struct tipc_msg *hdr = buf_msg(skb);
bool con_msg = msg_connected(hdr);
u32 pport = tsk_peer_port(tsk);
u32 pnode = tsk_peer_node(tsk);
u32 oport = msg_origport(hdr);
u32 onode = msg_orignode(hdr);
int err = msg_errcode(hdr);
unsigned long delay;
if (unlikely(msg_mcast(hdr)))
return false;
switch (sk->sk_state) {
case TIPC_CONNECTING:
/* Setup ACK */
if (likely(con_msg)) {
if (err)
break;
tipc_sk_finish_conn(tsk, oport, onode);
msg_set_importance(&tsk->phdr, msg_importance(hdr));
/* ACK+ message with data is added to receive queue */
if (msg_data_sz(hdr))
return true;
/* Empty ACK-, - wake up sleeping connect() and drop */
sk->sk_data_ready(sk);
msg_set_dest_droppable(hdr, 1);
return false;
}
/* Ignore connectionless message if not from listening socket */
if (oport != pport || onode != pnode)
return false;
/* Rejected SYN */
if (err != TIPC_ERR_OVERLOAD)
break;
/* Prepare for new setup attempt if we have a SYN clone */
if (skb_queue_empty(&sk->sk_write_queue))
break;
get_random_bytes(&delay, 2);
delay %= (tsk->conn_timeout / 4);
delay = msecs_to_jiffies(delay + 100);
sk_reset_timer(sk, &sk->sk_timer, jiffies + delay);
return false;
case TIPC_OPEN:
case TIPC_DISCONNECTING:
return false;
case TIPC_LISTEN:
/* Accept only SYN message */
if (!msg_is_syn(hdr) &&
tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT)
return false;
if (!con_msg && !err)
return true;
return false;
case TIPC_ESTABLISHED:
/* Accept only connection-based messages sent by peer */
if (likely(con_msg && !err && pport == oport && pnode == onode))
return true;
if (!tsk_peer_msg(tsk, hdr))
return false;
if (!err)
return true;
tipc_set_sk_state(sk, TIPC_DISCONNECTING);
tipc_node_remove_conn(net, pnode, tsk->portid);
sk->sk_state_change(sk);
return true;
default:
pr_err("Unknown sk_state %u\n", sk->sk_state);
}
/* Abort connection setup attempt */
tipc_set_sk_state(sk, TIPC_DISCONNECTING);
sk->sk_err = ECONNREFUSED;
sk->sk_state_change(sk);
return true;
}
/**
* rcvbuf_limit - get proper overload limit of socket receive queue
* @sk: socket
* @skb: message
*
* For connection oriented messages, irrespective of importance,
* default queue limit is 2 MB.
*
* For connectionless messages, queue limits are based on message
* importance as follows:
*
* TIPC_LOW_IMPORTANCE (2 MB)
* TIPC_MEDIUM_IMPORTANCE (4 MB)
* TIPC_HIGH_IMPORTANCE (8 MB)
* TIPC_CRITICAL_IMPORTANCE (16 MB)
*
* Returns overload limit according to corresponding message importance
*/
static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
{
struct tipc_sock *tsk = tipc_sk(sk);
struct tipc_msg *hdr = buf_msg(skb);
if (unlikely(msg_in_group(hdr)))
return sk->sk_rcvbuf;
if (unlikely(!msg_connected(hdr)))
return sk->sk_rcvbuf << msg_importance(hdr);
if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
return sk->sk_rcvbuf;
return FLOWCTL_MSG_LIM;
}
/**
* tipc_sk_filter_rcv - validate incoming message
* @sk: socket
* @skb: pointer to message.
*
* Enqueues message on receive queue if acceptable; optionally handles
* disconnect indication for a connected socket.
*
* Called with socket lock already taken
*
*/
static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
struct sk_buff_head *xmitq)
{
bool sk_conn = !tipc_sk_type_connectionless(sk);
struct tipc_sock *tsk = tipc_sk(sk);
struct tipc_group *grp = tsk->group;
struct tipc_msg *hdr = buf_msg(skb);
struct net *net = sock_net(sk);
struct sk_buff_head inputq;
int mtyp = msg_type(hdr);
int limit, err = TIPC_OK;
trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " ");
TIPC_SKB_CB(skb)->bytes_read = 0;
__skb_queue_head_init(&inputq);
__skb_queue_tail(&inputq, skb);
if (unlikely(!msg_isdata(hdr)))
tipc_sk_proto_rcv(sk, &inputq, xmitq);
if (unlikely(grp))
tipc_group_filter_msg(grp, &inputq, xmitq);
if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG)
tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq);
/* Validate and add to receive buffer if there is space */
while ((skb = __skb_dequeue(&inputq))) {
hdr = buf_msg(skb);
limit = rcvbuf_limit(sk, skb);
if ((sk_conn && !tipc_sk_filter_connect(tsk, skb)) ||
(!sk_conn && msg_connected(hdr)) ||
(!grp && msg_in_group(hdr)))
err = TIPC_ERR_NO_PORT;
else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL,
"err_overload2!");
atomic_inc(&sk->sk_drops);
err = TIPC_ERR_OVERLOAD;
}
if (unlikely(err)) {
if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) {
trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE,
"@filter_rcv!");
__skb_queue_tail(xmitq, skb);
}
err = TIPC_OK;
continue;
}
__skb_queue_tail(&sk->sk_receive_queue, skb);
skb_set_owner_r(skb, sk);
trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL,
"rcvq >90% allocated!");
sk->sk_data_ready(sk);
}
}
/**
* tipc_sk_backlog_rcv - handle incoming message from backlog queue
* @sk: socket
* @skb: message
*
* Caller must hold socket lock
*/
static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
{
unsigned int before = sk_rmem_alloc_get(sk);
struct sk_buff_head xmitq;
unsigned int added;
__skb_queue_head_init(&xmitq);
tipc_sk_filter_rcv(sk, skb, &xmitq);
added = sk_rmem_alloc_get(sk) - before;
atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
/* Send pending response/rejected messages, if any */
tipc_node_distr_xmit(sock_net(sk), &xmitq);
return 0;
}
/**
* tipc_sk_enqueue - extract all buffers with destination 'dport' from
* inputq and try adding them to socket or backlog queue
* @inputq: list of incoming buffers with potentially different destinations
* @sk: socket where the buffers should be enqueued
* @dport: port number for the socket
*
* Caller must hold socket lock
*/
static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
u32 dport, struct sk_buff_head *xmitq)
{
unsigned long time_limit = jiffies + 2;
struct sk_buff *skb;
unsigned int lim;
atomic_t *dcnt;
u32 onode;
while (skb_queue_len(inputq)) {
if (unlikely(time_after_eq(jiffies, time_limit)))
return;
skb = tipc_skb_dequeue(inputq, dport);
if (unlikely(!skb))
return;
/* Add message directly to receive queue if possible */
if (!sock_owned_by_user(sk)) {
tipc_sk_filter_rcv(sk, skb, xmitq);
continue;
}
/* Try backlog, compensating for double-counted bytes */
dcnt = &tipc_sk(sk)->dupl_rcvcnt;
if (!sk->sk_backlog.len)
atomic_set(dcnt, 0);
lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
if (likely(!sk_add_backlog(sk, skb, lim))) {
trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL,
"bklg & rcvq >90% allocated!");
continue;
}
trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!");
/* Overload => reject message back to sender */
onode = tipc_own_addr(sock_net(sk));
atomic_inc(&sk->sk_drops);
if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) {
trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL,
"@sk_enqueue!");
__skb_queue_tail(xmitq, skb);
}
break;
}
}
/**
* tipc_sk_rcv - handle a chain of incoming buffers
* @inputq: buffer list containing the buffers
* Consumes all buffers in list until inputq is empty
* Note: may be called in multiple threads referring to the same queue
*/
void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
{
struct sk_buff_head xmitq;
u32 dnode, dport = 0;
int err;
struct tipc_sock *tsk;
struct sock *sk;
struct sk_buff *skb;
__skb_queue_head_init(&xmitq);
while (skb_queue_len(inputq)) {
dport = tipc_skb_peek_port(inputq, dport);
tsk = tipc_sk_lookup(net, dport);
if (likely(tsk)) {
sk = &tsk->sk;
if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
tipc_sk_enqueue(inputq, sk, dport, &xmitq);
spin_unlock_bh(&sk->sk_lock.slock);
}
/* Send pending response/rejected messages, if any */
tipc_node_distr_xmit(sock_net(sk), &xmitq);
sock_put(sk);
continue;
}
/* No destination socket => dequeue skb if still there */
skb = tipc_skb_dequeue(inputq, dport);
if (!skb)
return;
/* Try secondary lookup if unresolved named message */
err = TIPC_ERR_NO_PORT;
if (tipc_msg_lookup_dest(net, skb, &err))
goto xmit;
/* Prepare for message rejection */
if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
continue;
trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!");
xmit:
dnode = msg_destnode(buf_msg(skb));
tipc_node_xmit_skb(net, skb, dnode, dport);
}
}
static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
{
DEFINE_WAIT_FUNC(wait, woken_wake_function);
struct sock *sk = sock->sk;
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);
add_wait_queue(sk_sleep(sk), &wait);
done = sk_wait_event(sk, timeo_p,
sk->sk_state != TIPC_CONNECTING, &wait);
remove_wait_queue(sk_sleep(sk), &wait);
} while (!done);
return 0;
}
static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr)
{
if (addr->family != AF_TIPC)
return false;
if (addr->addrtype == TIPC_SERVICE_RANGE)
return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper);
return (addr->addrtype == TIPC_SERVICE_ADDR ||
addr->addrtype == TIPC_SOCKET_ADDR);
}
/**
* 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 tipc_sock *tsk = tipc_sk(sk);
struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
struct msghdr m = {NULL,};
long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
int previous;
int res = 0;
if (destlen != sizeof(struct sockaddr_tipc))
return -EINVAL;
lock_sock(sk);
if (tsk->group) {
res = -EINVAL;
goto exit;
}
if (dst->family == AF_UNSPEC) {
memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
if (!tipc_sk_type_connectionless(sk))
res = -EINVAL;
goto exit;
}
if (!tipc_sockaddr_is_sane(dst)) {
res = -EINVAL;
goto exit;
}
/* DGRAM/RDM connect(), just save the destaddr */
if (tipc_sk_type_connectionless(sk)) {
memcpy(&tsk->peer, dest, destlen);
goto exit;
} else if (dst->addrtype == TIPC_SERVICE_RANGE) {
res = -EINVAL;
goto exit;
}
previous = sk->sk_state;
switch (sk->sk_state) {
case TIPC_OPEN:
/* 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(sock, &m, 0);
if ((res < 0) && (res != -EWOULDBLOCK))
goto exit;
/* Just entered TIPC_CONNECTING state; the only
* difference is that return value in non-blocking
* case is EINPROGRESS, rather than EALREADY.
*/
res = -EINPROGRESS;
/* fall through */
case TIPC_CONNECTING:
if (!timeout) {
if (previous == TIPC_CONNECTING)
res = -EALREADY;
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 TIPC_ESTABLISHED:
res = -EISCONN;
break;
default:
res = -EINVAL;
}
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);
res = tipc_set_sk_state(sk, TIPC_LISTEN);
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 = -EAGAIN;
if (!timeo)
break;
err = sock_intr_errno(timeo);
if (signal_pending(current))
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,
bool kern)
{
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 (sk->sk_state != TIPC_LISTEN) {
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, kern);
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));
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_sendstream(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;
int res;
if (how != SHUT_RDWR)
return -EINVAL;
lock_sock(sk);
trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " ");
__tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
sk->sk_shutdown = SEND_SHUTDOWN;
if (sk->sk_state == TIPC_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;
} else {
res = -ENOTCONN;
}
release_sock(sk);
return res;
}
static void tipc_sk_check_probing_state(struct sock *sk,
struct sk_buff_head *list)
{
struct tipc_sock *tsk = tipc_sk(sk);
u32 pnode = tsk_peer_node(tsk);
u32 pport = tsk_peer_port(tsk);
u32 self = tsk_own_node(tsk);
u32 oport = tsk->portid;
struct sk_buff *skb;
if (tsk->probe_unacked) {
tipc_set_sk_state(sk, TIPC_DISCONNECTING);
sk->sk_err = ECONNABORTED;
tipc_node_remove_conn(sock_net(sk), pnode, pport);
sk->sk_state_change(sk);
return;
}
/* Prepare new probe */
skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
pnode, self, pport, oport, TIPC_OK);
if (skb)
__skb_queue_tail(list, skb);
tsk->probe_unacked = true;
sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
}
static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list)
{
struct tipc_sock *tsk = tipc_sk(sk);
/* Try again later if dest link is congested */
if (tsk->cong_link_cnt) {
sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100));
return;
}
/* Prepare SYN for retransmit */
tipc_msg_skb_clone(&sk->sk_write_queue, list);
}
static void tipc_sk_timeout(struct timer_list *t)
{
struct sock *sk = from_timer(sk, t, sk_timer);
struct tipc_sock *tsk = tipc_sk(sk);
u32 pnode = tsk_peer_node(tsk);
struct sk_buff_head list;
int rc = 0;
skb_queue_head_init(&list);
bh_lock_sock(sk);
/* Try again later if socket is busy */
if (sock_owned_by_user(sk)) {
sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
bh_unlock_sock(sk);
return;
}
if (sk->sk_state == TIPC_ESTABLISHED)
tipc_sk_check_probing_state(sk, &list);
else if (sk->sk_state == TIPC_CONNECTING)
tipc_sk_retry_connect(sk, &list);
bh_unlock_sock(sk);
if (!skb_queue_empty(&list))
rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid);
/* SYN messages may cause link congestion */
if (rc == -ELINKCONG) {
tipc_dest_push(&tsk->cong_links, pnode, 0);
tsk->cong_link_cnt = 1;
}
sock_put(sk);
}
static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
struct tipc_name_seq const *seq)
{
struct sock *sk = &tsk->sk;
struct net *net = sock_net(sk);
struct publication *publ;
u32 key;
if (scope != TIPC_NODE_SCOPE)
scope = TIPC_CLUSTER_SCOPE;
if (tipc_sk_connected(sk))
return -EINVAL;
key = tsk->portid + tsk->pub_count + 1;
if (key == tsk->portid)
return -EADDRINUSE;
publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper,
scope, tsk->portid, key);
if (unlikely(!publ))
return -EINVAL;
list_add(&publ->binding_sock, &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 net *net = sock_net(&tsk->sk);
struct publication *publ;
struct publication *safe;
int rc = -EINVAL;
if (scope != TIPC_NODE_SCOPE)
scope = TIPC_CLUSTER_SCOPE;