/* * 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 #include #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" #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ #define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */ #define TIPC_FWD_MSG 1 #define TIPC_MAX_PORT 0xffffffff #define TIPC_MIN_PORT 1 #define TIPC_ACK_RATE 4 /* ACK at 1/4 of of rcv window size */ enum { TIPC_LISTEN = TCP_LISTEN, TIPC_ESTABLISHED = TCP_ESTABLISHED, TIPC_OPEN = TCP_CLOSE, TIPC_DISCONNECTING = TCP_CLOSE_WAIT, TIPC_CONNECTING = TCP_SYN_SENT, }; struct sockaddr_pair { struct sockaddr_tipc sock; struct sockaddr_tipc member; }; /** * struct tipc_sock - TIPC socket structure * @sk: socket - interacts with 'port' and with user via the socket API * @conn_type: TIPC type used when connection was established * @conn_instance: TIPC instance used when connection was established * @published: non-zero if port has one or more associated names * @max_pkt: maximum packet size "hint" used when building messages sent by port * @portid: unique port identity in TIPC socket hash table * @phdr: preformatted message header used when sending messages * #cong_links: list of congested links * @publications: list of publications for port * @blocking_link: address of the congested link we are currently sleeping on * @pub_count: total # of publications port has made during its lifetime * @probing_state: * @conn_timeout: the time we can wait for an unresponded setup request * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue * @cong_link_cnt: number of congested links * @snt_unacked: # messages sent by socket, and not yet acked by peer * @rcv_unacked: # messages read by user, but not yet acked back to peer * @peer: 'connected' peer for dgram/rdm * @node: hash table node * @mc_method: cookie for use between socket and broadcast layer * @rcu: rcu struct for tipc_sock */ struct tipc_sock { struct sock sk; u32 conn_type; u32 conn_instance; int published; u32 max_pkt; u32 portid; struct tipc_msg phdr; struct list_head cong_links; struct list_head publications; u32 pub_count; uint conn_timeout; atomic_t dupl_rcvcnt; 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; }; static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); static void tipc_data_ready(struct sock *sk); static void tipc_write_space(struct sock *sk); static void tipc_sock_destruct(struct sock *sk); static int tipc_release(struct socket *sock); static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, bool kern); static void tipc_sk_timeout(struct timer_list *t); static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, struct tipc_name_seq const *seq); static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, struct tipc_name_seq const *seq); static int tipc_sk_leave(struct tipc_sock *tsk); static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid); static int tipc_sk_insert(struct tipc_sock *tsk); static void tipc_sk_remove(struct tipc_sock *tsk); static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz); static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz); static const struct proto_ops packet_ops; static const struct proto_ops stream_ops; static const struct proto_ops msg_ops; static struct proto tipc_proto; static const struct rhashtable_params tsk_rht_params; static u32 tsk_own_node(struct tipc_sock *tsk) { return msg_prevnode(&tsk->phdr); } static u32 tsk_peer_node(struct tipc_sock *tsk) { return msg_destnode(&tsk->phdr); } static u32 tsk_peer_port(struct tipc_sock *tsk) { return msg_destport(&tsk->phdr); } static bool tsk_unreliable(struct tipc_sock *tsk) { return msg_src_droppable(&tsk->phdr) != 0; } static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable) { msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0); } static bool tsk_unreturnable(struct tipc_sock *tsk) { return msg_dest_droppable(&tsk->phdr) != 0; } static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable) { msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0); } static int tsk_importance(struct tipc_sock *tsk) { return msg_importance(&tsk->phdr); } static int tsk_set_importance(struct tipc_sock *tsk, int imp) { if (imp > TIPC_CRITICAL_IMPORTANCE) return -EINVAL; msg_set_importance(&tsk->phdr, (u32)imp); return 0; } static struct tipc_sock *tipc_sk(const struct sock *sk) { return container_of(sk, struct tipc_sock, sk); } static bool tsk_conn_cong(struct tipc_sock *tsk) { return tsk->snt_unacked > tsk->snd_win; } static u16 tsk_blocks(int len) { return ((len / FLOWCTL_BLK_SZ) + 1); } /* tsk_blocks(): translate a buffer size in bytes to number of * advertisable blocks, taking into account the ratio truesize(len)/len * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ */ static u16 tsk_adv_blocks(int len) { return len / FLOWCTL_BLK_SZ / 4; } /* tsk_inc(): increment counter for sent or received data * - If block based flow control is not supported by peer we * fall back to message based ditto, incrementing the counter */ static u16 tsk_inc(struct tipc_sock *tsk, int msglen) { if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) return ((msglen / FLOWCTL_BLK_SZ) + 1); return 1; } /** * tsk_advance_rx_queue - discard first buffer in socket receive queue * * Caller must hold socket lock */ static void tsk_advance_rx_queue(struct sock *sk) { 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; 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; struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); u32 peer_port = tsk_peer_port(tsk); u32 orig_node; u32 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 == tn->own_addr)) return true; if (!peer_node && (orig_node == tn->own_addr)) 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_) \ ({ \ struct sock *sk_; \ int rc_; \ \ while ((rc_ = !(condition_))) { \ DEFINE_WAIT_FUNC(wait_, woken_wake_function); \ sk_ = (sock_)->sk; \ rc_ = tipc_sk_sock_err((sock_), timeo_); \ if (rc_) \ break; \ prepare_to_wait(sk_sleep(sk_), &wait_, TASK_INTERRUPTIBLE); \ 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) { struct tipc_net *tn; const struct proto_ops *ops; struct sock *sk; struct tipc_sock *tsk; struct tipc_msg *msg; /* Validate arguments */ if (unlikely(protocol != 0)) return -EPROTONOSUPPORT; switch (sock->type) { case SOCK_STREAM: ops = &stream_ops; break; case SOCK_SEQPACKET: ops = &packet_ops; break; case SOCK_DGRAM: case SOCK_RDM: ops = &msg_ops; break; default: return -EPROTOTYPE; } /* Allocate socket's protocol area */ sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern); if (sk == NULL) return -ENOMEM; tsk = tipc_sk(sk); tsk->max_pkt = MAX_PKT_DEFAULT; INIT_LIST_HEAD(&tsk->publications); INIT_LIST_HEAD(&tsk->cong_links); msg = &tsk->phdr; tn = net_generic(sock_net(sk), tipc_net_id); /* 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(tn->own_addr, 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; 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); } return 0; } static void tipc_sk_callback(struct rcu_head *head) { struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu); sock_put(&tsk->sk); } /* Caller should hold socket lock for the socket. */ static void __tipc_shutdown(struct socket *sock, int error) { struct sock *sk = sock->sk; struct tipc_sock *tsk = tipc_sk(sk); struct net *net = sock_net(sk); long timeout = CONN_TIMEOUT_DEFAULT; u32 dnode = tsk_peer_node(tsk); struct sk_buff *skb; /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */ tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))); /* 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); __tipc_shutdown(sock, TIPC_ERR_NO_PORT); sk->sk_shutdown = SHUTDOWN_MASK; tipc_sk_leave(tsk); tipc_sk_withdraw(tsk, 0, NULL); sk_stop_timer(sk, &sk->sk_timer); tipc_sk_remove(tsk); /* 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 *uaddr_len, int peer) { struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; struct sock *sk = sock->sk; struct tipc_sock *tsk = tipc_sk(sk); struct tipc_net *tn = net_generic(sock_net(sock->sk), tipc_net_id); 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 = tn->own_addr; } *uaddr_len = sizeof(*addr); addr->addrtype = TIPC_ADDR_ID; addr->family = AF_TIPC; addr->scope = 0; addr->addr.name.domain = 0; return 0; } /** * tipc_poll - read and possibly block on pollmask * @file: file structure associated with the socket * @sock: socket for which to calculate the poll bits * @wait: ??? * * Returns pollmask value * * COMMENTARY: * It appears that the usual socket locking mechanisms are not useful here * since the pollmask info is potentially out-of-date the moment this routine * exits. TCP and other protocols seem to rely on higher level poll routines * to handle any preventable race conditions, so TIPC will do the same ... * * IMPORTANT: The fact that a read or write operation is indicated does NOT * imply that the operation will succeed, merely that it should be performed * and will not block. */ static unsigned int tipc_poll(struct file *file, struct socket *sock, poll_table *wait) { struct sock *sk = sock->sk; struct tipc_sock *tsk = tipc_sk(sk); struct tipc_group *grp = tsk->group; u32 revents = 0; sock_poll_wait(file, sk_sleep(sk), wait); if (sk->sk_shutdown & RCV_SHUTDOWN) revents |= POLLRDHUP | POLLIN | POLLRDNORM; if (sk->sk_shutdown == SHUTDOWN_MASK) revents |= POLLHUP; switch (sk->sk_state) { case TIPC_ESTABLISHED: if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk)) revents |= POLLOUT; /* fall thru' */ case TIPC_LISTEN: case TIPC_CONNECTING: if (!skb_queue_empty(&sk->sk_receive_queue)) revents |= POLLIN | POLLRDNORM; break; case TIPC_OPEN: if (!grp || tipc_group_size(grp)) if (!tsk->cong_link_cnt) revents |= POLLOUT; if (!tipc_sk_type_connectionless(sk)) break; if (skb_queue_empty(&sk->sk_receive_queue)) break; revents |= POLLIN | POLLRDNORM; break; case TIPC_DISCONNECTING: revents = POLLIN | POLLRDNORM | POLLHUP; 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; u32 domain = addr_domain(net, TIPC_CLUSTER_SCOPE); 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, domain, &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)) rc = tipc_mcast_xmit(net, &pkts, method, &dsts, &tsk->cong_link_cnt); tipc_nlist_purge(&dsts); return rc ? rc : dlen; } /** * tipc_send_group_msg - send a message to a member in the group * @net: network namespace * @m: message to send * @mb: group member * @dnode: destination node * @dport: destination port * @dlen: total length of message data */ static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk, struct msghdr *m, struct tipc_member *mb, u32 dnode, u32 dport, int dlen) { u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group); struct tipc_mc_method *method = &tsk->mc_method; int blks = tsk_blocks(GROUP_H_SIZE + dlen); struct tipc_msg *hdr = &tsk->phdr; struct sk_buff_head pkts; int mtu, rc; /* Complete message header */ msg_set_type(hdr, TIPC_GRP_UCAST_MSG); msg_set_hdr_sz(hdr, GROUP_H_SIZE); msg_set_destport(hdr, dport); msg_set_destnode(hdr, dnode); msg_set_grp_bc_seqno(hdr, bc_snd_nxt); /* Build message as chain of buffers */ skb_queue_head_init(&pkts); mtu = tipc_node_get_mtu(net, dnode, tsk->portid); rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); if (unlikely(rc != dlen)) return rc; /* Send message */ rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); if (unlikely(rc == -ELINKCONG)) { tipc_dest_push(&tsk->cong_links, dnode, 0); tsk->cong_link_cnt++; } /* Update send window */ tipc_group_update_member(mb, blks); /* A broadcast sent within next EXPIRE period must follow same path */ method->rcast = true; method->mandatory = true; return dlen; } /** * tipc_send_group_unicast - send message to a member in the group * @sock: socket structure * @m: message to send * @dlen: total length of message data * @timeout: timeout to wait for wakeup * * Called from function tipc_sendmsg(), which has done all sanity checks * Returns the number of bytes sent on success, or errno */ static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m, int dlen, long timeout) { struct sock *sk = sock->sk; DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); int blks = tsk_blocks(GROUP_H_SIZE + dlen); struct tipc_sock *tsk = tipc_sk(sk); struct tipc_group *grp = tsk->group; 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) && !tipc_group_cong(grp, 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_group *grp = tsk->group; struct tipc_member *first = NULL; struct tipc_member *mbr = NULL; struct net *net = sock_net(sk); u32 node, port, exclude; u32 type, inst, domain; struct list_head dsts; int lookups = 0; int dstcnt, rc; bool cong; INIT_LIST_HEAD(&dsts); type = dest->addr.name.name.type; inst = dest->addr.name.name.instance; domain = addr_domain(net, dest->scope); exclude = tipc_group_exclude(grp); while (++lookups < 4) { first = NULL; /* Look for a non-congested destination member, if any */ while (1) { if (!tipc_nametbl_lookup(net, type, inst, domain, &dsts, &dstcnt, exclude, false)) return -EHOSTUNREACH; tipc_dest_pop(&dsts, &node, &port); cong = tipc_group_cong(grp, 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) && !tipc_group_cong(grp, 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_group *grp = tsk->group; struct tipc_nlist *dsts = tipc_group_dests(grp); 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; if (!dsts->local && !dsts->remote) return -EHOSTUNREACH; /* Block or return if any destination link or member is congested */ rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt && !tipc_group_bc_cong(grp, blks)); if (unlikely(rc)) return rc; /* 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(grp)); /* 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_name_seq *seq = &dest->addr.nameseq; struct tipc_sock *tsk = tipc_sk(sk); struct tipc_group *grp = tsk->group; struct net *net = sock_net(sk); u32 domain, exclude, dstcnt; struct list_head dsts; INIT_LIST_HEAD(&dsts); if (seq->lower != seq->upper) return -ENOTSUPP; domain = addr_domain(net, dest->scope); exclude = tipc_group_exclude(grp); if (!tipc_nametbl_lookup(net, seq->type, seq->lower, domain, &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 scope = TIPC_CLUSTER_SCOPE; u32 self = tipc_own_addr(net); struct sk_buff *skb, *_skb; u32 lower = 0, upper = ~0; struct sk_buff_head tmpq; u32 portid, oport, onode; struct list_head dports; struct tipc_msg *msg; int user, mtyp, hsz; __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)) { msg = buf_msg(skb); user = msg_user(msg); mtyp = msg_type(msg); 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); } refcount_dec(&skb->users); spin_unlock_bh(&inputq->lock); continue; } hsz = skb_headroom(skb) + msg_hdr_sz(msg); oport = msg_origport(msg); onode = msg_orignode(msg); if (onode == self) scope = TIPC_NODE_SCOPE; /* Create destination port list and message clones: */ if (!msg_in_group(msg)) { lower = msg_namelower(msg); upper = msg_nameupper(msg); } tipc_nametbl_mc_translate(net, msg_nametype(msg), lower, upper, scope, &dports); while (tipc_dest_pop(&dports, NULL, &portid)) { _skb = __pskb_copy(skb, hsz, GFP_ATOMIC); if (_skb) { msg_set_destport(buf_msg(_skb), portid); __skb_queue_tail(&tmpq, _skb); continue; } pr_warn("Failed to clone mcast rcv buffer\n"); } /* Append to inputq if not already done by other thread */ spin_lock_bh(&inputq->lock); if (skb_peek(arrvq) == skb) { skb_queue_splice_tail_init(&tmpq, inputq); kfree_skb(__skb_dequeue(arrvq)); } spin_unlock_bh(&inputq->lock); __skb_queue_purge(&tmpq); kfree_skb(skb); } tipc_sk_rcv(net, inputq); } /** * tipc_sk_conn_proto_rcv - receive a connection mng protocol message * @tsk: receiving socket * @skb: pointer to message buffer. */ static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb, struct sk_buff_head *xmitq) { struct tipc_msg *hdr = buf_msg(skb); u32 onode = tsk_own_node(tsk); struct sock *sk = &tsk->sk; int mtyp = msg_type(hdr); bool conn_cong; /* Ignore if connection cannot be validated: */ if (!tsk_peer_msg(tsk, hdr)) 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); goto exit; } tsk->probe_unacked = false; if (mtyp == CONN_PROBE) { msg_set_type(hdr, CONN_PROBE_REPLY); if (tipc_msg_reverse(onode, &skb, TIPC_OK)) __skb_queue_tail(xmitq, skb); return; } else if (mtyp == CONN_ACK) { conn_cong = tsk_conn_cong(tsk); tsk->snt_unacked -= msg_conn_ack(hdr); if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) tsk->snd_win = msg_adv_win(hdr); if (conn_cong) sk->sk_write_space(sk); } else if (mtyp != CONN_PROBE_REPLY) { pr_warn("Received unknown CONN_PROTO msg\n"); } exit: kfree_skb(skb); } /** * tipc_sendmsg - send message in connectionless manner * @sock: socket structure * @m: message to send * @dsz: amount of user data to be sent * * Message must have an destination specified explicitly. * Used for SOCK_RDM and SOCK_DGRAM messages, * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. * (Note: 'SYN+' is prohibited on SOCK_STREAM.) * * Returns the number of bytes sent on success, or errno otherwise */ static int tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz) { struct sock *sk = sock->sk; int ret; lock_sock(sk); ret = __tipc_sendmsg(sock, m, dsz); release_sock(sk); return ret; } static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen) { struct sock *sk = sock->sk; struct net *net = sock_net(sk); struct tipc_sock *tsk = tipc_sk(sk); DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); struct list_head *clinks = &tsk->cong_links; bool syn = !tipc_sk_type_connectionless(sk); struct tipc_group *grp = tsk->group; struct tipc_msg *hdr = &tsk->phdr; struct tipc_name_seq *seq; struct sk_buff_head pkts; u32 type, inst, domain; u32 dnode, dport; 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; } } 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; domain = dest->addr.name.domain; dnode = domain; msg_set_type(hdr, TIPC_NAMED_MSG); msg_set_hdr_sz(hdr, NAMED_H_SIZE); msg_set_nametype(hdr, type); msg_set_nameinst(hdr, inst); msg_set_lookup_scope(hdr, tipc_addr_scope(domain)); dport = tipc_nametbl_translate(net, type, inst, &dnode); msg_set_destnode(hdr, dnode); msg_set_destport(hdr, dport); if (unlikely(!dport && !dnode)) return -EHOSTUNREACH; } else if (dest->addrtype == TIPC_ADDR_ID) { dnode = dest->addr.id.node; msg_set_type(hdr, TIPC_DIRECT_MSG); msg_set_lookup_scope(hdr, 0); msg_set_destnode(hdr, dnode); msg_set_destport(hdr, dest->addr.id.ref); msg_set_hdr_sz(hdr, BASIC_H_SIZE); } /* Block or return if destination link is congested */ rc = tipc_wait_for_cond(sock, &timeout, !tipc_dest_find(clinks, dnode, 0)); if (unlikely(rc)) return rc; skb_queue_head_init(&pkts); mtu = tipc_node_get_mtu(net, dnode, tsk->portid); rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); if (unlikely(rc != dlen)) return rc; rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); if (unlikely(rc == -ELINKCONG)) { tipc_dest_push(clinks, dnode, 0); tsk->cong_link_cnt++; rc = 0; } if (unlikely(syn && !rc)) tipc_set_sk_state(sk, TIPC_CONNECTING); return rc ? rc : dlen; } /** * tipc_sendstream - send stream-oriented data * @sock: socket structure * @m: data to send * @dsz: total length of data to be transmitted * * Used for SOCK_STREAM data. * * Returns the number of bytes sent on success (or partial success), * or errno if no data sent */ static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz) { struct sock *sk = sock->sk; int ret; lock_sock(sk); ret = __tipc_sendstream(sock, m, dsz); release_sock(sk); return ret; } static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen) { struct sock *sk = sock->sk; DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); struct tipc_sock *tsk = tipc_sk(sk); struct tipc_msg *hdr = &tsk->phdr; struct net *net = sock_net(sk); struct sk_buff_head pkts; u32 dnode = tsk_peer_node(tsk); int send, sent = 0; int rc = 0; skb_queue_head_init(&pkts); if (unlikely(dlen > INT_MAX)) return -EMSGSIZE; /* Handle implicit connection setup */ if (unlikely(dest)) { rc = __tipc_sendmsg(sock, m, dlen); if (dlen && (dlen == rc)) tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr)); return rc; } do { rc = tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt && !tsk_conn_cong(tsk) && tipc_sk_connected(sk))); if (unlikely(rc)) break; send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE); rc = tipc_msg_build(hdr, m, sent, send, tsk->max_pkt, &pkts); if (unlikely(rc != send)) break; rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); if (unlikely(rc == -ELINKCONG)) { tsk->cong_link_cnt = 1; rc = 0; } if (likely(!rc)) { tsk->snt_unacked += tsk_inc(tsk, send + MIN_H_SIZE); sent += send; } } while (sent < dlen && !rc); return sent ? sent : rc; } /** * tipc_send_packet - send a connection-oriented message * @sock: socket structure * @m: message to send * @dsz: length of data to be transmitted * * Used for SOCK_SEQPACKET messages. * * Returns the number of bytes sent on success, or errno otherwise */ static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz) { if (dsz > TIPC_MAX_USER_MSG_SIZE) return -EMSGSIZE; return tipc_sendstream(sock, m, dsz); } /* tipc_sk_finish_conn - complete the setup of a connection */ static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, u32 peer_node) { struct sock *sk = &tsk->sk; struct net *net = sock_net(sk); struct tipc_msg *msg = &tsk->phdr; msg_set_destnode(msg, peer_node); msg_set_destport(msg, peer_port); msg_set_type(msg, TIPC_CONN_MSG); msg_set_lookup_scope(msg, 0); msg_set_hdr_sz(msg, SHORT_H_SIZE); sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); tipc_set_sk_state(sk, TIPC_ESTABLISHED); tipc_node_add_conn(net, peer_node, tsk->portid, peer_port); tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid); tsk->peer_caps = tipc_node_get_capabilities(net, peer_node); 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.addr.id.ref = msg_origport(hdr); srcaddr->sock.addr.id.node = msg_orignode(hdr); srcaddr->sock.addr.name.domain = 0; srcaddr->sock.scope = 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.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 * @msg: received message header * @tsk: TIPC port associated with message * * Note: Ancillary data is not captured if not requested by receiver. * * Returns 0 if successful, otherwise errno */ static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg, struct tipc_sock *tsk) { u32 anc_data[3]; u32 err; u32 dest_type; int has_name; int res; if (likely(m->msg_controllen == 0)) return 0; /* Optionally capture errored message object(s) */ err = msg ? msg_errcode(msg) : 0; if (unlikely(err)) { anc_data[0] = err; anc_data[1] = msg_data_sz(msg); res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); if (res) return res; if (anc_data[1]) { res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], msg_data(msg)); if (res) return res; } } /* Optionally capture message destination object */ dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; switch (dest_type) { case TIPC_NAMED_MSG: has_name = 1; anc_data[0] = msg_nametype(msg); anc_data[1] = msg_namelower(msg); anc_data[2] = msg_namelower(msg); break; case TIPC_MCAST_MSG: has_name = 1; anc_data[0] = msg_nametype(msg); anc_data[1] = msg_namelower(msg); anc_data[2] = msg_nameupper(msg); break; case TIPC_CONN_MSG: has_name = (tsk->conn_type != 0); anc_data[0] = tsk->conn_type; anc_data[1] = tsk->conn_instance; anc_data[2] = tsk->conn_instance; break; default: has_name = 0; } if (has_name) { res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); if (res) return res; } return 0; } static void tipc_sk_send_ack(struct tipc_sock *tsk) { 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(wait); long timeo = *timeop; int err = sock_error(sk); if (err) return err; for (;;) { prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { if (sk->sk_shutdown & RCV_SHUTDOWN) { err = -ENOTCONN; break; } release_sock(sk); timeo = schedule_timeout(timeo); lock_sock(sk); } err = 0; if (!skb_queue_empty(&sk->sk_receive_queue)) break; err = -EAGAIN; if (!timeo) break; err = sock_intr_errno(timeo); if (signal_pending(current)) break; err = sock_error(sk); if (err) break; } finish_wait(sk_sleep(sk), &wait); *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, hdr, tsk); if (unlikely(rc)) goto exit; /* Capture data if non-error msg, otherwise just set return value */ if (likely(!err)) { copy = min_t(int, dlen, buflen); if (unlikely(copy != dlen)) m->msg_flags |= MSG_TRUNC; rc = skb_copy_datagram_msg(skb, hlen, m, copy); } else { copy = 0; rc = 0; if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) rc = -ECONNRESET; } if (unlikely(rc)) goto exit; /* Mark message as group event if applicable */ if (unlikely(grp_evt)) { if (msg_grp_evt(hdr) == TIPC_WITHDRAWN) m->msg_flags |= MSG_EOR; m->msg_flags |= MSG_OOB; copy = 0; } /* Caption of data or error code/rejected data was successful */ if (unlikely(flags & MSG_PEEK)) goto exit; /* Send group flow control advertisement when applicable */ if (tsk->group && msg_in_group(hdr) && !grp_evt) { skb_queue_head_init(&xmitq); tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen), msg_orignode(hdr), msg_origport(hdr), &xmitq); tipc_node_distr_xmit(sock_net(sk), &xmitq); } tsk_advance_rx_queue(sk); if (likely(!connected)) goto exit; /* Send connection flow control advertisement when applicable */ tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) tipc_sk_send_ack(tsk); exit: release_sock(sk); return rc ? rc : copy; } /** * tipc_recvstream - receive stream-oriented data * @m: descriptor for message info * @buflen: total size of user buffer area * @flags: receive flags * * Used for SOCK_STREAM messages only. If not enough data is available * will optionally wait for more; never truncates data. * * Returns size of returned message data, errno otherwise */ static int tipc_recvstream(struct socket *sock, struct msghdr *m, size_t buflen, int flags) { struct sock *sk = sock->sk; struct tipc_sock *tsk = tipc_sk(sk); struct sk_buff *skb; struct tipc_msg *hdr; struct tipc_skb_cb *skb_cb; bool peek = flags & MSG_PEEK; int offset, required, copy, copied = 0; int hlen, dlen, err, rc; long timeout; /* Catch invalid receive attempts */ if (unlikely(!buflen)) return -EINVAL; lock_sock(sk); if (unlikely(sk->sk_state == TIPC_OPEN)) { rc = -ENOTCONN; goto exit; } required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen); timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); do { /* Look at first msg in receive queue; wait if necessary */ rc = tipc_wait_for_rcvmsg(sock, &timeout); if (unlikely(rc)) break; skb = skb_peek(&sk->sk_receive_queue); skb_cb = TIPC_SKB_CB(skb); hdr = buf_msg(skb); dlen = msg_data_sz(hdr); hlen = msg_hdr_sz(hdr); err = msg_errcode(hdr); /* Discard any empty non-errored (SYN-) message */ if (unlikely(!dlen && !err)) { tsk_advance_rx_queue(sk); continue; } /* Collect msg meta data, incl. error code and rejected data */ if (!copied) { tipc_sk_set_orig_addr(m, skb); rc = tipc_sk_anc_data_recv(m, hdr, tsk); if (rc) break; } /* Copy data if msg ok, otherwise return error/partial data */ if (likely(!err)) { offset = skb_cb->bytes_read; copy = min_t(int, dlen - offset, buflen - copied); rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); if (unlikely(rc)) break; copied += copy; offset += copy; if (unlikely(offset < dlen)) { if (!peek) skb_cb->bytes_read = offset; break; } } else { rc = 0; if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control) rc = -ECONNRESET; if (copied || rc) break; } if (unlikely(peek)) break; tsk_advance_rx_queue(sk); /* Send connection flow control advertisement when applicable */ tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); if (unlikely(tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)) tipc_sk_send_ack(tsk); /* Exit if all requested data or FIN/error received */ if (copied == buflen || err) break; } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required); exit: release_sock(sk); return copied ? copied : rc; } /** * tipc_write_space - wake up thread if port congestion is released * @sk: socket */ static void tipc_write_space(struct sock *sk) { struct socket_wq *wq; rcu_read_lock(); wq = rcu_dereference(sk->sk_wq); if (skwq_has_sleeper(wq)) wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | POLLWRNORM | POLLWRBAND); rcu_read_unlock(); } /** * tipc_data_ready - wake up threads to indicate messages have been received * @sk: socket * @len: the length of messages */ static void tipc_data_ready(struct sock *sk) { struct socket_wq *wq; rcu_read_lock(); wq = rcu_dereference(sk->sk_wq); if (skwq_has_sleeper(wq)) wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLRDNORM | POLLRDBAND); 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, xmitq); return; case SOCK_WAKEUP: tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0); tsk->cong_link_cnt--; wakeup = true; break; case GROUP_PROTOCOL: tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq); break; case TOP_SRV: tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf, skb, inputq, xmitq); skb = NULL; break; default: break; } if (wakeup) sk->sk_write_space(sk); kfree_skb(skb); } /** * tipc_filter_connect - Handle incoming message for a connection-based socket * @tsk: TIPC socket * @skb: pointer to message buffer. Set to NULL if buffer is consumed * * Returns true if everything ok, 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); u32 pport = msg_origport(hdr); u32 pnode = msg_orignode(hdr); if (unlikely(msg_mcast(hdr))) return false; switch (sk->sk_state) { case TIPC_CONNECTING: /* Accept only ACK or NACK message */ if (unlikely(!msg_connected(hdr))) { if (pport != tsk_peer_port(tsk) || pnode != tsk_peer_node(tsk)) return false; tipc_set_sk_state(sk, TIPC_DISCONNECTING); sk->sk_err = ECONNREFUSED; sk->sk_state_change(sk); return true; } if (unlikely(msg_errcode(hdr))) { tipc_set_sk_state(sk, TIPC_DISCONNECTING); sk->sk_err = ECONNREFUSED; sk->sk_state_change(sk); return true; } if (unlikely(!msg_isdata(hdr))) { tipc_set_sk_state(sk, TIPC_DISCONNECTING); sk->sk_err = EINVAL; sk->sk_state_change(sk); return true; } tipc_sk_finish_conn(tsk, msg_origport(hdr), msg_orignode(hdr)); msg_set_importance(&tsk->phdr, msg_importance(hdr)); /* If 'ACK+' message, add to socket receive queue */ if (msg_data_sz(hdr)) return true; /* If empty 'ACK-' message, wake up sleeping connect() */ sk->sk_data_ready(sk); /* 'ACK-' message is neither accepted nor rejected: */ msg_set_dest_droppable(hdr, 1); return false; case TIPC_OPEN: case TIPC_DISCONNECTING: break; case TIPC_LISTEN: /* Accept only SYN message */ if (!msg_connected(hdr) && !(msg_errcode(hdr))) return true; break; case TIPC_ESTABLISHED: /* Accept only connection-based messages sent by peer */ if (unlikely(!tsk_peer_msg(tsk, hdr))) return false; if (unlikely(msg_errcode(hdr))) { tipc_set_sk_state(sk, TIPC_DISCONNECTING); /* Let timer expire on it's own */ tipc_node_remove_conn(net, tsk_peer_node(tsk), tsk->portid); sk->sk_state_change(sk); } return true; default: pr_err("Unknown sk_state %u\n", sk->sk_state); } return false; } /** * rcvbuf_limit - get proper overload limit of socket receive queue * @sk: socket * @skb: message * * For connection oriented messages, irrespective of importance, * default queue limit is 2 MB. * * For connectionless messages, queue limits are based on message * importance as follows: * * TIPC_LOW_IMPORTANCE (2 MB) * TIPC_MEDIUM_IMPORTANCE (4 MB) * TIPC_HIGH_IMPORTANCE (8 MB) * TIPC_CRITICAL_IMPORTANCE (16 MB) * * Returns overload limit according to corresponding message importance */ static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb) { struct tipc_sock *tsk = tipc_sk(sk); struct tipc_msg *hdr = buf_msg(skb); if (unlikely(msg_in_group(hdr))) return sk->sk_rcvbuf; if (unlikely(!msg_connected(hdr))) return sk->sk_rcvbuf << msg_importance(hdr); if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) return sk->sk_rcvbuf; return FLOWCTL_MSG_LIM; } /** * tipc_sk_filter_rcv - validate incoming message * @sk: socket * @skb: pointer to message. * * Enqueues message on receive queue if acceptable; optionally handles * disconnect indication for a connected socket. * * Called with socket lock already taken * */ static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *xmitq) { bool sk_conn = !tipc_sk_type_connectionless(sk); struct tipc_sock *tsk = tipc_sk(sk); struct tipc_group *grp = tsk->group; struct tipc_msg *hdr = buf_msg(skb); struct net *net = sock_net(sk); struct sk_buff_head inputq; int limit, err = TIPC_OK; 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); /* 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) err = TIPC_ERR_OVERLOAD; if (unlikely(err)) { tipc_skb_reject(net, err, skb, xmitq); err = TIPC_OK; continue; } __skb_queue_tail(&sk->sk_receive_queue, skb); skb_set_owner_r(skb, sk); 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))) continue; /* Overload => reject message back to sender */ onode = tipc_own_addr(sock_net(sk)); if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) __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; 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; } /** * 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; } else if (dst->family != AF_TIPC) { res = -EINVAL; } if (dst->addrtype != TIPC_ADDR_ID && dst->addrtype != TIPC_ADDR_NAME) res = -EINVAL; if (res) goto exit; /* DGRAM/RDM connect(), just save the destaddr */ if (tipc_sk_type_connectionless(sk)) { memcpy(&tsk->peer, dest, destlen); 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 thru' */ 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); __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_timeout(struct timer_list *t) { struct sock *sk = from_timer(sk, t, sk_timer); struct tipc_sock *tsk = tipc_sk(sk); u32 peer_port = tsk_peer_port(tsk); u32 peer_node = tsk_peer_node(tsk); u32 own_node = tsk_own_node(tsk); u32 own_port = tsk->portid; struct net *net = sock_net(sk); struct sk_buff *skb = NULL; bh_lock_sock(sk); if (!tipc_sk_connected(sk)) goto exit; /* Try again later if socket is busy */ if (sock_owned_by_user(sk)) { sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20); goto exit; } if (tsk->probe_unacked) { tipc_set_sk_state(sk, TIPC_DISCONNECTING); tipc_node_remove_conn(net, peer_node, peer_port); sk->sk_state_change(sk); goto exit; } /* Send new probe */ skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0, peer_node, own_node, peer_port, own_port, TIPC_OK); tsk->probe_unacked = true; sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); exit: bh_unlock_sock(sk); if (skb) tipc_node_xmit_skb(net, skb, peer_node, own_port); 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 (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->pport_list, &tsk->publications); tsk->pub_count++; tsk->published = 1; return 0; } static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, struct tipc_name_seq const *seq) { struct net *net = sock_net(&tsk->sk); struct publication *publ; struct publication *safe; int rc = -EINVAL; list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) { if (seq) { if (publ->scope != scope) continue; if (publ->type != seq->type) continue; if (publ->lower != seq->lower) continue; if (publ->upper != seq->upper) break; tipc_nametbl_withdraw(net, publ->type, publ->lower, publ->ref, publ->key); rc = 0; break; } tipc_nametbl_withdraw(net, publ->type, publ->lower, publ->ref, 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)) { spin_lock_bh(&tsk->sk.sk_lock.slock); msg = &tsk->phdr; msg_set_prevnode(msg, tn->own_addr); msg_set_orignode(msg, tn->own_addr); spin_unlock_bh(&tsk->sk.sk_lock.slock); } rhashtable_walk_stop(&iter); } while (tsk == ERR_PTR(-EAGAIN)); } 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_fast(&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); u32 domain = addr_domain(net, mreq->scope); 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 (grp) return -EACCES; grp = tipc_group_create(net, tsk->portid, mreq); 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, domain); rc = tipc_sk_publish(tsk, mreq->scope, &seq); if (rc) { tipc_group_delete(net, grp); tsk->group = NULL; } /* Eliminate any risk that a broadcast overtakes the sent JOIN */ tsk->mc_method.rcast = true; tsk->mc_method.mandatory = true; 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: 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; 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_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 sock *sk = sock->sk; 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(sock_net(sk), lnr.bearer_id & 0xffff, lnr.peer, lnr.linkname, TIPC_MAX_LINK_NAME)) { if (copy_to_user(argp, &lnr, sizeof(lnr))) return -EFAULT; return 0; } return -EADDRNOTAVAIL; default: return -ENOIOCTLCMD; } } 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(skb, TIPC_NLA_SOCK_CON); 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; } /* 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) { int err; void *hdr; struct nlattr *attrs; struct net *net = sock_net(skb->sk); struct tipc_net *tn = net_generic(net, tipc_net_id); struct sock *sk = &tsk->sk; 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(skb, TIPC_NLA_SOCK); if (!attrs) goto genlmsg_cancel; if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid)) goto attr_msg_cancel; if (nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tn->own_addr)) goto attr_msg_cancel; if (tipc_sk_connected(sk)) { err = __tipc_nl_add_sk_con(skb, tsk); if (err) goto attr_msg_cancel; } else if (!list_empty(&tsk->publications)) { if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) 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_dump(struct sk_buff *skb, struct netlink_callback *cb) { int err; struct tipc_sock *tsk; const struct bucket_table *tbl; struct rhash_head *pos; struct net *net = sock_net(skb->sk); struct tipc_net *tn = net_generic(net, tipc_net_id); u32 tbl_id = cb->args[0]; u32 prev_portid = cb->args[1]; rcu_read_lock(); tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht); for (; tbl_id < tbl->size; tbl_id++) { rht_for_each_entry_rcu(tsk, pos, tbl, tbl_id, node) { spin_lock_bh(&tsk->sk.sk_lock.slock); if (prev_portid && prev_portid != tsk->portid) { spin_unlock_bh(&tsk->sk.sk_lock.slock); continue; } err = __tipc_nl_add_sk(skb, cb, tsk); if (err) { prev_portid = tsk->portid; spin_unlock_bh(&tsk->sk.sk_lock.slock); goto out; } prev_portid = 0; spin_unlock_bh(&tsk->sk.sk_lock.slock); } } out: rcu_read_unlock(); cb->args[0] = tbl_id; cb->args[1] = prev_portid; return skb->len; } /* 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(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, pport_list) { 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, pport_list); } list_for_each_entry_from(p, &tsk->publications, pport_list) { 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; struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; err = tipc_nlmsg_parse(cb->nlh, &attrs); if (err) return err; if (!attrs[TIPC_NLA_SOCK]) return -EINVAL; err = nla_parse_nested(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; }