| /* |
| * 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 |
| * @maxnagle: maximum size of msg which can be subject to nagle |
| * @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 maxnagle; |
| 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; |
| u32 oneway; |
| u16 snd_backlog; |
| bool expect_ack; |
| bool nodelay; |
| 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 void tipc_sk_push_backlog(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 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_set_nagle - enable/disable nagle property by manipulating maxnagle |
| */ |
| static void tsk_set_nagle(struct tipc_sock *tsk) |
| { |
| struct sock *sk = &tsk->sk; |
| |
| tsk->maxnagle = 0; |
| if (sk->sk_type != SOCK_STREAM) |
| return; |
| if (tsk->nodelay) |
| return; |
| if (!(tsk->peer_caps & TIPC_NAGLE)) |
| return; |
| /* Limit node local buffer size to avoid receive queue overflow */ |
| if (tsk->max_pkt == MAX_MSG_SIZE) |
| tsk->maxnagle = 1500; |
| else |
| tsk->maxnagle = tsk->max_pkt; |
| } |
| |
| /** |
| * 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; |
| tsk->maxnagle = 0; |
| 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 = msecs_to_jiffies(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))); |
| |
| /* Push out delayed messages if in Nagle mode */ |
| tipc_sk_push_backlog(tsk); |
| /* Remove pending SYN */ |
| __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: |
| if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk)) |
| revents |= EPOLLOUT; |
| /* fall through */ |
| case TIPC_LISTEN: |
| case TIPC_CONNECTING: |
| if (!skb_queue_empty_lockless(&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_lockless(&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, false); |
| 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_push_backlog(): send accumulated buffers in socket write queue |
| * when socket is in Nagle mode |
| */ |
| static void tipc_sk_push_backlog(struct tipc_sock *tsk) |
| { |
| struct sk_buff_head *txq = &tsk->sk.sk_write_queue; |
| struct net *net = sock_net(&tsk->sk); |
| u32 dnode = tsk_peer_node(tsk); |
| struct sk_buff *skb = skb_peek(txq); |
| int rc; |
| |
| if (!skb || tsk->cong_link_cnt) |
| return; |
| |
| /* Do not send SYN again after congestion */ |
| if (msg_is_syn(buf_msg(skb))) |
| return; |
| |
| tsk->snt_unacked += tsk->snd_backlog; |
| tsk->snd_backlog = 0; |
| tsk->expect_ack = true; |
| rc = tipc_node_xmit(net, txq, dnode, tsk->portid); |
| if (rc == -ELINKCONG) |
| tsk->cong_link_cnt = 1; |
| } |
| |
| /** |
| * 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 was_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) { |
| was_cong = tsk_conn_cong(tsk); |
| tsk->expect_ack = false; |
| tipc_sk_push_backlog(tsk); |
| tsk->snt_unacked -= msg_conn_ack(hdr); |
| if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) |
| tsk->snd_win = msg_adv_win(hdr); |
| if (was_cong && !tsk_conn_cong(tsk)) |
| 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 = 0, dnode = 0; |
| u32 type = 0, inst = 0; |
| 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; |
| dport = tipc_nametbl_translate(net, type, inst, &dnode); |
| if (unlikely(!dport && !dnode)) |
| return -EHOSTUNREACH; |
| } else if (dest->addrtype == TIPC_ADDR_ID) { |
| dnode = dest->addr.id.node; |
| } 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; |
| |
| if (dest->addrtype == TIPC_ADDR_NAME) { |
| 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)); |
| msg_set_destnode(hdr, dnode); |
| msg_set_destport(hdr, dport); |
| } else { /* TIPC_ADDR_ID */ |
| 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); |
| } |
| |
| __skb_queue_head_init(&pkts); |
| mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false); |
| 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))) { |
| __skb_queue_purge(&pkts); |
| 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 sk_buff_head *txq = &sk->sk_write_queue; |
| struct tipc_sock *tsk = tipc_sk(sk); |
| struct tipc_msg *hdr = &tsk->phdr; |
| struct net *net = sock_net(sk); |
| u32 dnode = tsk_peer_node(tsk); |
| int maxnagle = tsk->maxnagle; |
| int maxpkt = tsk->max_pkt; |
| int send, sent = 0; |
| int blocks, rc = 0; |
| |
| 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); |
| blocks = tsk->snd_backlog; |
| if (tsk->oneway++ >= 4 && send <= maxnagle) { |
| rc = tipc_msg_append(hdr, m, send, maxnagle, txq); |
| if (unlikely(rc < 0)) |
| break; |
| blocks += rc; |
| if (blocks <= 64 && tsk->expect_ack) { |
| tsk->snd_backlog = blocks; |
| sent += send; |
| break; |
| } |
| tsk->expect_ack = true; |
| } else { |
| rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq); |
| if (unlikely(rc != send)) |
| break; |
| blocks += tsk_inc(tsk, send + MIN_H_SIZE); |
| } |
| trace_tipc_sk_sendstream(sk, skb_peek(txq), |
| TIPC_DUMP_SK_SNDQ, " "); |
| rc = tipc_node_xmit(net, txq, dnode, tsk->portid); |
| if (unlikely(rc == -ELINKCONG)) { |
| tsk->cong_link_cnt = 1; |
| rc = 0; |
| } |
| if (likely(!rc)) { |
| tsk->snt_unacked += blocks; |
| tsk->snd_backlog = 0; |
| 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, true); |
| tsk->peer_caps = tipc_node_get_capabilities(net, peer_node); |
| tsk_set_nagle(tsk); |
| __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; |
| bool ack = false; |
| 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)) { |
| ack = msg_ack_required(hdr); |
| 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 (ack || 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; |
| tipc_sk_push_backlog(tsk); |
| 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; |
| tsk->oneway = 0; |
| |
| 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_state_change(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: |
| if (!skb_queue_empty(&sk->sk_write_queue)) |
| tipc_sk_push_backlog(tsk); |
| /* 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 READ_ONCE(sk->sk_rcvbuf); |
| |
| if (unlikely(!msg_connected(hdr))) |
| return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr); |
| |
| if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) |
| return READ_ONCE(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); |
| sock_put(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; |
| |
| list_for_each_entry_safe(publ, safe, &tsk->publications, binding_sock) { |
| 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(net, publ->type, publ->lower, |
| publ->upper, publ->key); |
| rc = 0; |
| break; |
| } |
| tipc_nametbl_withdraw(net, publ->type, publ->lower, |
| publ->upper, publ->key); |
| rc = 0; |
| } |
| if (list_empty(&tsk->publications)) |
| tsk->published = 0; |
| return rc; |
| } |
| |
| /* tipc_sk_reinit: set non-zero address in all existing sockets |
| * when we go from standalone to network mode. |
| */ |
| void tipc_sk_reinit(struct net *net) |
| { |
| struct tipc_net *tn = net_generic(net, tipc_net_id); |
| struct rhashtable_iter iter; |
| struct tipc_sock *tsk; |
| struct tipc_msg *msg; |
| |
| rhashtable_walk_enter(&tn->sk_rht, &iter); |
| |
| do { |
| rhashtable_walk_start(&iter); |
| |
| while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) { |
| sock_hold(&tsk->sk); |
| rhashtable_walk_stop(&iter); |
| lock_sock(&tsk->sk); |
| msg = &tsk->phdr; |
| msg_set_prevnode(msg, tipc_own_addr(net)); |
| msg_set_orignode(msg, tipc_own_addr(net)); |
| release_sock(&tsk->sk); |
| rhashtable_walk_start(&iter); |
| sock_put(&tsk->sk); |
| } |
| |
| rhashtable_walk_stop(&iter); |
| } while (tsk == ERR_PTR(-EAGAIN)); |
| |
| rhashtable_walk_exit(&iter); |
| } |
| |
| static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) |
| { |
| struct tipc_net *tn = net_generic(net, tipc_net_id); |
| struct tipc_sock *tsk; |
| |
| rcu_read_lock(); |
| tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params); |
| if (tsk) |
| sock_hold(&tsk->sk); |
| rcu_read_unlock(); |
| |
| return tsk; |
| } |
| |
| static int tipc_sk_insert(struct tipc_sock *tsk) |
| { |
| struct sock *sk = &tsk->sk; |
| struct net *net = sock_net(sk); |
| struct tipc_net *tn = net_generic(net, tipc_net_id); |
| u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; |
| u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT; |
| |
| while (remaining--) { |
| portid++; |
| if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) |
| portid = TIPC_MIN_PORT; |
| tsk->portid = portid; |
| sock_hold(&tsk->sk); |
| if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node, |
| tsk_rht_params)) |
| return 0; |
| sock_put(&tsk->sk); |
| } |
| |
| return -1; |
| } |
| |
| static void tipc_sk_remove(struct tipc_sock *tsk) |
| { |
| struct sock *sk = &tsk->sk; |
| struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); |
| |
| if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) { |
| WARN_ON(refcount_read(&sk->sk_refcnt) == 1); |
| __sock_put(sk); |
| } |
| } |
| |
| static const struct rhashtable_params tsk_rht_params = { |
| .nelem_hint = 192, |
| .head_offset = offsetof(struct tipc_sock, node), |
| .key_offset = offsetof(struct tipc_sock, portid), |
| .key_len = sizeof(u32), /* portid */ |
| .max_size = 1048576, |
| .min_size = 256, |
| .automatic_shrinking = true, |
| }; |
| |
| int tipc_sk_rht_init(struct net *net) |
| { |
| struct tipc_net *tn = net_generic(net, tipc_net_id); |
| |
| return rhashtable_init(&tn->sk_rht, &tsk_rht_params); |
| } |
| |
| void tipc_sk_rht_destroy(struct net *net) |
| { |
| struct tipc_net *tn = net_generic(net, tipc_net_id); |
| |
| /* Wait for socket readers to complete */ |
| synchronize_net(); |
| |
| rhashtable_destroy(&tn->sk_rht); |
| } |
| |
| static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq) |
| { |
| struct net *net = sock_net(&tsk->sk); |
| struct tipc_group *grp = tsk->group; |
| struct tipc_msg *hdr = &tsk->phdr; |
| struct tipc_name_seq seq; |
| int rc; |
| |
| if (mreq->type < TIPC_RESERVED_TYPES) |
| return -EACCES; |
| if (mreq->scope > TIPC_NODE_SCOPE) |
| return -EINVAL; |
| if (grp) |
| return -EACCES; |
| grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open); |
| if (!grp) |
| return -ENOMEM; |
| tsk->group = grp; |
| msg_set_lookup_scope(hdr, mreq->scope); |
| msg_set_nametype(hdr, mreq->type); |
| msg_set_dest_droppable(hdr, true); |
| seq.type = mreq->type; |
| seq.lower = mreq->instance; |
| seq.upper = seq.lower; |
| tipc_nametbl_build_group(net, grp, mreq->type, mreq->scope); |
| rc = tipc_sk_publish(tsk, mreq->scope, &seq); |
| if (rc) { |
| tipc_group_delete(net, grp); |
| tsk->group = NULL; |
| return rc; |
| } |
| /* Eliminate any risk that a broadcast overtakes sent JOINs */ |
| tsk->mc_method.rcast = true; |
| tsk->mc_method.mandatory = true; |
| tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf); |
| return rc; |
| } |
| |
| static int tipc_sk_leave(struct tipc_sock *tsk) |
| { |
| struct net *net = sock_net(&tsk->sk); |
| struct tipc_group *grp = tsk->group; |
| struct tipc_name_seq seq; |
| int scope; |
| |
| if (!grp) |
| return -EINVAL; |
| tipc_group_self(grp, &seq, &scope); |
| tipc_group_delete(net, grp); |
| tsk->group = NULL; |
| tipc_sk_withdraw(tsk, scope, &seq); |
| return 0; |
| } |
| |
| /** |
| * 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); |
| struct tipc_group_req mreq; |
| u32 value = 0; |
| int res = 0; |
| |
| if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
| return 0; |
| if (lvl != SOL_TIPC) |
| return -ENOPROTOOPT; |
| |
| switch (opt) { |
| case TIPC_IMPORTANCE: |
| case TIPC_SRC_DROPPABLE: |
| case TIPC_DEST_DROPPABLE: |
| case TIPC_CONN_TIMEOUT: |
| case TIPC_NODELAY: |
| if (ol < sizeof(value)) |
| return -EINVAL; |
| if (get_user(value, (u32 __user *)ov)) |
| return -EFAULT; |
| break; |
| case TIPC_GROUP_JOIN: |
| if (ol < sizeof(mreq)) |
| return -EINVAL; |
| if (copy_from_user(&mreq, ov, sizeof(mreq))) |
| return -EFAULT; |
| break; |
| default: |
| if (ov || ol) |
| return -EINVAL; |
| } |
| |
| 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; |
| break; |
| case TIPC_MCAST_BROADCAST: |
| tsk->mc_method.rcast = false; |
| tsk->mc_method.mandatory = true; |
| break; |
| case TIPC_MCAST_REPLICAST: |
| tsk->mc_method.rcast = true; |
| tsk->mc_method.mandatory = true; |
| break; |
| case TIPC_GROUP_JOIN: |
| res = tipc_sk_join(tsk, &mreq); |
| break; |
| case TIPC_GROUP_LEAVE: |
| res = tipc_sk_leave(tsk); |
| break; |
| case TIPC_NODELAY: |
| tsk->nodelay = !!value; |
| tsk_set_nagle(tsk); |
| 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); |
| struct tipc_name_seq seq; |
| int len, scope; |
| 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; |
| case TIPC_SOCK_RECVQ_USED: |
| value = sk_rmem_alloc_get(sk); |
| break; |
| case TIPC_GROUP_JOIN: |
| seq.type = 0; |
| if (tsk->group) |
| tipc_group_self(tsk->group, &seq, &scope); |
| value = seq.type; |
| 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 *sock, unsigned int cmd, unsigned long arg) |
| { |
| struct net *net = sock_net(sock->sk); |
| struct tipc_sioc_nodeid_req nr = {0}; |
| 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(net, |
| 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; |
| case SIOCGETNODEID: |
| if (copy_from_user(&nr, argp, sizeof(nr))) |
| return -EFAULT; |
| if (!tipc_node_get_id(net, nr.peer, nr.node_id)) |
| return -EADDRNOTAVAIL; |
| if (copy_to_user(argp, &nr, sizeof(nr))) |
| return -EFAULT; |
| return 0; |
| default: |
| return -ENOIOCTLCMD; |
| } |
| } |
| |
| static int tipc_socketpair(struct socket *sock1, struct socket *sock2) |
| { |
| struct tipc_sock *tsk2 = tipc_sk(sock2->sk); |
| struct tipc_sock *tsk1 = tipc_sk(sock1->sk); |
| u32 onode = tipc_own_addr(sock_net(sock1->sk)); |
| |
| tsk1->peer.family = AF_TIPC; |
| tsk1->peer.addrtype = TIPC_ADDR_ID; |
| tsk1->peer.scope = TIPC_NODE_SCOPE; |
| tsk1->peer.addr.id.ref = tsk2->portid; |
| tsk1->peer.addr.id.node = onode; |
| tsk2->peer.family = AF_TIPC; |
| tsk2->peer.addrtype = TIPC_ADDR_ID; |
| tsk2->peer.scope = TIPC_NODE_SCOPE; |
| tsk2->peer.addr.id.ref = tsk1->portid; |
| tsk2->peer.addr.id.node = onode; |
| |
| tipc_sk_finish_conn(tsk1, tsk2->portid, onode); |
| tipc_sk_finish_conn(tsk2, tsk1->portid, onode); |
| return 0; |
| } |
| |
| /* 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 = tipc_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 = tipc_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 = tipc_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_sendstream, |
| .recvmsg = tipc_recvstream, |
| .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 |
| }; |
| |
| /** |
| * 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); |
| } |
| |
| /* Caller should hold socket lock for the passed tipc socket. */ |
| static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk) |
| { |
| u32 peer_node; |
| u32 peer_port; |
| struct nlattr *nest; |
| |
| peer_node = tsk_peer_node(tsk); |
| peer_port = tsk_peer_port(tsk); |
| |
| nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON); |
| if (!nest) |
| return -EMSGSIZE; |
| |
| if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node)) |
| goto msg_full; |
| if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port)) |
| goto msg_full; |
| |
| if (tsk->conn_type != 0) { |
| if (nla_put_flag(skb, TIPC_NLA_CON_FLAG)) |
| goto msg_full; |
| if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type)) |
| goto msg_full; |
| if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance)) |
| goto msg_full; |
| } |
| nla_nest_end(skb, nest); |
| |
| return 0; |
| |
| msg_full: |
| nla_nest_cancel(skb, nest); |
| |
| return -EMSGSIZE; |
| } |
| |
| static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock |
| *tsk) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct sock *sk = &tsk->sk; |
| |
| if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) || |
| nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net))) |
| return -EMSGSIZE; |
| |
| if (tipc_sk_connected(sk)) { |
| if (__tipc_nl_add_sk_con(skb, tsk)) |
| return -EMSGSIZE; |
| } else if (!list_empty(&tsk->publications)) { |
| if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) |
| return -EMSGSIZE; |
| } |
| return 0; |
| } |
| |
| /* Caller should hold socket lock for the passed tipc socket. */ |
| static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb, |
| struct tipc_sock *tsk) |
| { |
| struct nlattr *attrs; |
| void *hdr; |
| |
| hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
| &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET); |
| if (!hdr) |
| goto msg_cancel; |
| |
| attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); |
| if (!attrs) |
| goto genlmsg_cancel; |
| |
| if (__tipc_nl_add_sk_info(skb, tsk)) |
| goto attr_msg_cancel; |
| |
| nla_nest_end(skb, attrs); |
| genlmsg_end(skb, hdr); |
| |
| return 0; |
| |
| attr_msg_cancel: |
| nla_nest_cancel(skb, attrs); |
| genlmsg_cancel: |
| genlmsg_cancel(skb, hdr); |
| msg_cancel: |
| return -EMSGSIZE; |
| } |
| |
| int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb, |
| int (*skb_handler)(struct sk_buff *skb, |
| struct netlink_callback *cb, |
| struct tipc_sock *tsk)) |
| { |
| struct rhashtable_iter *iter = (void *)cb->args[4]; |
| struct tipc_sock *tsk; |
| int err; |
| |
| rhashtable_walk_start(iter); |
| while ((tsk = rhashtable_walk_next(iter)) != NULL) { |
| if (IS_ERR(tsk)) { |
| err = PTR_ERR(tsk); |
| if (err == -EAGAIN) { |
| err = 0; |
| continue; |
| } |
| break; |
| } |
| |
| sock_hold(&tsk->sk); |
| rhashtable_walk_stop(iter); |
| lock_sock(&tsk->sk); |
| err = skb_handler(skb, cb, tsk); |
| if (err) { |
| release_sock(&tsk->sk); |
| sock_put(&tsk->sk); |
| goto out; |
| } |
| release_sock(&tsk->sk); |
| rhashtable_walk_start(iter); |
| sock_put(&tsk->sk); |
| } |
| rhashtable_walk_stop(iter); |
| out: |
| return skb->len; |
| } |
| EXPORT_SYMBOL(tipc_nl_sk_walk); |
| |
| int tipc_dump_start(struct netlink_callback *cb) |
| { |
| return __tipc_dump_start(cb, sock_net(cb->skb->sk)); |
| } |
| EXPORT_SYMBOL(tipc_dump_start); |
| |
| int __tipc_dump_start(struct netlink_callback *cb, struct net *net) |
| { |
| /* tipc_nl_name_table_dump() uses cb->args[0...3]. */ |
| struct rhashtable_iter *iter = (void *)cb->args[4]; |
| struct tipc_net *tn = tipc_net(net); |
| |
| if (!iter) { |
| iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
| if (!iter) |
| return -ENOMEM; |
| |
| cb->args[4] = (long)iter; |
| } |
| |
| rhashtable_walk_enter(&tn->sk_rht, iter); |
| return 0; |
| } |
| |
| int tipc_dump_done(struct netlink_callback *cb) |
| { |
| struct rhashtable_iter *hti = (void *)cb->args[4]; |
| |
| rhashtable_walk_exit(hti); |
| kfree(hti); |
| return 0; |
| } |
| EXPORT_SYMBOL(tipc_dump_done); |
| |
| int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb, |
| struct tipc_sock *tsk, u32 sk_filter_state, |
| u64 (*tipc_diag_gen_cookie)(struct sock *sk)) |
| { |
| struct sock *sk = &tsk->sk; |
| struct nlattr *attrs; |
| struct nlattr *stat; |
| |
| /*filter response w.r.t sk_state*/ |
| if (!(sk_filter_state & (1 << sk->sk_state))) |
| return 0; |
| |
| attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); |
| if (!attrs) |
| goto msg_cancel; |
| |
| if (__tipc_nl_add_sk_info(skb, tsk)) |
| goto attr_msg_cancel; |
| |
| if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) || |
| nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) || |
| nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) || |
| nla_put_u32(skb, TIPC_NLA_SOCK_UID, |
| from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk), |
| sock_i_uid(sk))) || |
| nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE, |
| tipc_diag_gen_cookie(sk), |
| TIPC_NLA_SOCK_PAD)) |
| goto attr_msg_cancel; |
| |
| stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT); |
| if (!stat) |
| goto attr_msg_cancel; |
| |
| if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ, |
| skb_queue_len(&sk->sk_receive_queue)) || |
| nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ, |
| skb_queue_len(&sk->sk_write_queue)) || |
| nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP, |
| atomic_read(&sk->sk_drops))) |
| goto stat_msg_cancel; |
| |
| if (tsk->cong_link_cnt && |
| nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG)) |
| goto stat_msg_cancel; |
| |
| if (tsk_conn_cong(tsk) && |
| nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG)) |
| goto stat_msg_cancel; |
| |
| nla_nest_end(skb, stat); |
| |
| if (tsk->group) |
| if (tipc_group_fill_sock_diag(tsk->group, skb)) |
| goto stat_msg_cancel; |
| |
| nla_nest_end(skb, attrs); |
| |
| return 0; |
| |
| stat_msg_cancel: |
| nla_nest_cancel(skb, stat); |
| attr_msg_cancel: |
| nla_nest_cancel(skb, attrs); |
| msg_cancel: |
| return -EMSGSIZE; |
| } |
| EXPORT_SYMBOL(tipc_sk_fill_sock_diag); |
| |
| int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk); |
| } |
| |
| /* Caller should hold socket lock for the passed tipc socket. */ |
| static int __tipc_nl_add_sk_publ(struct sk_buff *skb, |
| struct netlink_callback *cb, |
| struct publication *publ) |
| { |
| void *hdr; |
| struct nlattr *attrs; |
| |
| hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
| &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); |
| if (!hdr) |
| goto msg_cancel; |
| |
| attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL); |
| if (!attrs) |
| goto genlmsg_cancel; |
| |
| if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) |
| goto attr_msg_cancel; |
| if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type)) |
| goto attr_msg_cancel; |
| if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower)) |
| goto attr_msg_cancel; |
| if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper)) |
| goto attr_msg_cancel; |
| |
| nla_nest_end(skb, attrs); |
| genlmsg_end(skb, hdr); |
| |
| return 0; |
| |
| attr_msg_cancel: |
| nla_nest_cancel(skb, attrs); |
| genlmsg_cancel: |
| genlmsg_cancel(skb, hdr); |
| msg_cancel: |
| return -EMSGSIZE; |
| } |
| |
| /* Caller should hold socket lock for the passed tipc socket. */ |
| static int __tipc_nl_list_sk_publ(struct sk_buff *skb, |
| struct netlink_callback *cb, |
| struct tipc_sock *tsk, u32 *last_publ) |
| { |
| int err; |
| struct publication *p; |
| |
| if (*last_publ) { |
| list_for_each_entry(p, &tsk->publications, binding_sock) { |
| if (p->key == *last_publ) |
| break; |
| } |
| if (p->key != *last_publ) { |
| /* We never set seq or call nl_dump_check_consistent() |
| * this means that setting prev_seq here will cause the |
| * consistence check to fail in the netlink callback |
| * handler. Resulting in the last NLMSG_DONE message |
| * having the NLM_F_DUMP_INTR flag set. |
| */ |
| cb->prev_seq = 1; |
| *last_publ = 0; |
| return -EPIPE; |
| } |
| } else { |
| p = list_first_entry(&tsk->publications, struct publication, |
| binding_sock); |
| } |
| |
| list_for_each_entry_from(p, &tsk->publications, binding_sock) { |
| err = __tipc_nl_add_sk_publ(skb, cb, p); |
| if (err) { |
| *last_publ = p->key; |
| return err; |
| } |
| } |
| *last_publ = 0; |
| |
| return 0; |
| } |
| |
| int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| int err; |
| u32 tsk_portid = cb->args[0]; |
| u32 last_publ = cb->args[1]; |
| u32 done = cb->args[2]; |
| struct net *net = sock_net(skb->sk); |
| struct tipc_sock *tsk; |
| |
| if (!tsk_portid) { |
| struct nlattr **attrs = genl_dumpit_info(cb)->attrs; |
| struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; |
| |
| if (!attrs[TIPC_NLA_SOCK]) |
| return -EINVAL; |
| |
| err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX, |
| attrs[TIPC_NLA_SOCK], |
| tipc_nl_sock_policy, NULL); |
| if (err) |
| return err; |
| |
| if (!sock[TIPC_NLA_SOCK_REF]) |
| return -EINVAL; |
| |
| tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); |
| } |
| |
| if (done) |
| return 0; |
| |
| tsk = tipc_sk_lookup(net, tsk_portid); |
| if (!tsk) |
| return -EINVAL; |
| |
| lock_sock(&tsk->sk); |
| err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); |
| if (!err) |
| done = 1; |
| release_sock(&tsk->sk); |
| sock_put(&tsk->sk); |
| |
| cb->args[0] = tsk_portid; |
| cb->args[1] = last_publ; |
| cb->args[2] = done; |
| |
| return skb->len; |
| } |
| |
| /** |
| * tipc_sk_filtering - check if a socket should be traced |
| * @sk: the socket to be examined |
| * @sysctl_tipc_sk_filter[]: the socket tuple for filtering, |
| * (portid, sock type, name type, name lower, name upper) |
| * |
| * Returns true if the socket meets the socket tuple data |
| * (value 0 = 'any') or when there is no tuple set (all = 0), |
| * otherwise false |
| */ |
| bool tipc_sk_filtering(struct sock *sk) |
| { |
| struct tipc_sock *tsk; |
| struct publication *p; |
| u32 _port, _sktype, _type, _lower, _upper; |
| u32 type = 0, lower = 0, upper = 0; |
| |
| if (!sk) |
| return true; |
| |
| tsk = tipc_sk(sk); |
| |
| _port = sysctl_tipc_sk_filter[0]; |
| _sktype = sysctl_tipc_sk_filter[1]; |
| _type = sysctl_tipc_sk_filter[2]; |
| _lower = sysctl_tipc_sk_filter[3]; |
| _upper = sysctl_tipc_sk_filter[4]; |
| |
| if (!_port && !_sktype && !_type && !_lower && !_upper) |
| return true; |
| |
| if (_port) |
| return (_port == tsk->portid); |
| |
| if (_sktype && _sktype != sk->sk_type) |
| return false; |
| |
| if (tsk->published) { |
| p = list_first_entry_or_null(&tsk->publications, |
| struct publication, binding_sock); |
| if (p) { |
| type = p->type; |
| lower = p->lower; |
| upper = p->upper; |
| } |
| } |
| |
| if (!tipc_sk_type_connectionless(sk)) { |
| type = tsk->conn_type; |
| lower = tsk->conn_instance; |
| upper = tsk->conn_instance; |
| } |
| |
| if ((_type && _type != type) || (_lower && _lower != lower) || |
| (_upper && _upper != upper)) |
| return false; |
| |
| return true; |
| } |
| |
| u32 tipc_sock_get_portid(struct sock *sk) |
| { |
| return (sk) ? (tipc_sk(sk))->portid : 0; |
| } |
| |
| /** |
| * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded, |
| * both the rcv and backlog queues are considered |
| * @sk: tipc sk to be checked |
| * @skb: tipc msg to be checked |
| * |
| * Returns true if the socket rx queue allocation is > 90%, otherwise false |
| */ |
| |
| bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb) |
| { |
| atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt; |
| unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); |
| unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk); |
| |
| return (qsize > lim * 90 / 100); |
| } |
| |
| /** |
| * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded, |
| * only the rcv queue is considered |
| * @sk: tipc sk to be checked |
| * @skb: tipc msg to be checked |
| * |
| * Returns true if the socket rx queue allocation is > 90%, otherwise false |
| */ |
| |
| bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb) |
| { |
| unsigned int lim = rcvbuf_limit(sk, skb); |
| unsigned int qsize = sk_rmem_alloc_get(sk); |
| |
| return (qsize > lim * 90 / 100); |
| } |
| |
| /** |
| * tipc_sk_dump - dump TIPC socket |
| * @sk: tipc sk to be dumped |
| * @dqueues: bitmask to decide if any socket queue to be dumped? |
| * - TIPC_DUMP_NONE: don't dump socket queues |
| * - TIPC_DUMP_SK_SNDQ: dump socket send queue |
| * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue |
| * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue |
| * - TIPC_DUMP_ALL: dump all the socket queues above |
| * @buf: returned buffer of dump data in format |
| */ |
| int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf) |
| { |
| int i = 0; |
| size_t sz = (dqueues) ? SK_LMAX : SK_LMIN; |
| struct tipc_sock *tsk; |
| struct publication *p; |
| bool tsk_connected; |
| |
| if (!sk) { |
| i += scnprintf(buf, sz, "sk data: (null)\n"); |
| return i; |
| } |
| |
| tsk = tipc_sk(sk); |
| tsk_connected = !tipc_sk_type_connectionless(sk); |
| |
| i += scnprintf(buf, sz, "sk data: %u", sk->sk_type); |
| i += scnprintf(buf + i, sz - i, " %d", sk->sk_state); |
| i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk)); |
| i += scnprintf(buf + i, sz - i, " %u", tsk->portid); |
| i += scnprintf(buf + i, sz - i, " | %u", tsk_connected); |
| if (tsk_connected) { |
| i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk)); |
| i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk)); |
| i += scnprintf(buf + i, sz - i, " %u", tsk->conn_type); |
| i += scnprintf(buf + i, sz - i, " %u", tsk->conn_instance); |
| } |
| i += scnprintf(buf + i, sz - i, " | %u", tsk->published); |
| if (tsk->published) { |
| p = list_first_entry_or_null(&tsk->publications, |
| struct publication, binding_sock); |
| i += scnprintf(buf + i, sz - i, " %u", (p) ? p->type : 0); |
| i += scnprintf(buf + i, sz - i, " %u", (p) ? p->lower : 0); |
| i += scnprintf(buf + i, sz - i, " %u", (p) ? p->upper : 0); |
| } |
| i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win); |
| i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win); |
| i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt); |
| i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps); |
| i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt); |
| i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked); |
| i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked); |
| i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt)); |
| i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown); |
| i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk)); |
| i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf); |
| i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk)); |
| i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf); |
| i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len)); |
| |
| if (dqueues & TIPC_DUMP_SK_SNDQ) { |
| i += scnprintf(buf + i, sz - i, "sk_write_queue: "); |
| i += tipc_list_dump(&sk->sk_write_queue, false, buf + i); |
| } |
| |
| if (dqueues & TIPC_DUMP_SK_RCVQ) { |
| i += scnprintf(buf + i, sz - i, "sk_receive_queue: "); |
| i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i); |
| } |
| |
| if (dqueues & TIPC_DUMP_SK_BKLGQ) { |
| i += scnprintf(buf + i, sz - i, "sk_backlog:\n head "); |
| i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i); |
| if (sk->sk_backlog.tail != sk->sk_backlog.head) { |
| i += scnprintf(buf + i, sz - i, " tail "); |
| i += tipc_skb_dump(sk->sk_backlog.tail, false, |
| buf + i); |
| } |
| } |
| |
| return i; |
| } |
