| /* |
| * net/tipc/socket.c: TIPC socket API |
| * |
| * Copyright (c) 2001-2007, 2012-2016, 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" |
| |
| #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ |
| #define CONN_PROBING_INTERVAL 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 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 |
| * @sent_unacked: # messages sent by socket, and not yet acked by peer |
| * @rcv_unacked: # messages read by user, but not yet acked back to peer |
| * @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; |
| }; |
| |
| static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
| static void tipc_data_ready(struct sock *sk); |
| static void tipc_write_space(struct sock *sk); |
| static 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(unsigned long data); |
| 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 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; |
| } |
| |
| /* 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); |
| setup_timer(&sk->sk_timer, tipc_sk_timeout, (unsigned long)tsk); |
| sk->sk_shutdown = 0; |
| sk->sk_backlog_rcv = tipc_backlog_rcv; |
| sk->sk_rcvbuf = sysctl_tipc_rmem[1]; |
| sk->sk_data_ready = tipc_data_ready; |
| sk->sk_write_space = tipc_write_space; |
| 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_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); |
| u32_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 (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); |
| u32 mask = 0; |
| |
| sock_poll_wait(file, sk_sleep(sk), wait); |
| |
| if (sk->sk_shutdown & RCV_SHUTDOWN) |
| mask |= POLLRDHUP | POLLIN | POLLRDNORM; |
| if (sk->sk_shutdown == SHUTDOWN_MASK) |
| mask |= POLLHUP; |
| |
| switch (sk->sk_state) { |
| case TIPC_ESTABLISHED: |
| if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk)) |
| mask |= POLLOUT; |
| /* fall thru' */ |
| case TIPC_LISTEN: |
| case TIPC_CONNECTING: |
| if (!skb_queue_empty(&sk->sk_receive_queue)) |
| mask |= (POLLIN | POLLRDNORM); |
| break; |
| case TIPC_OPEN: |
| if (!tsk->cong_link_cnt) |
| mask |= POLLOUT; |
| if (tipc_sk_type_connectionless(sk) && |
| (!skb_queue_empty(&sk->sk_receive_queue))) |
| mask |= (POLLIN | POLLRDNORM); |
| break; |
| case TIPC_DISCONNECTING: |
| mask = (POLLIN | POLLRDNORM | POLLHUP); |
| break; |
| } |
| |
| return mask; |
| } |
| |
| /** |
| * 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; |
| |
| /* 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_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) |
| { |
| struct tipc_msg *msg; |
| struct list_head dports; |
| u32 portid; |
| u32 scope = TIPC_CLUSTER_SCOPE; |
| struct sk_buff_head tmpq; |
| uint hsz; |
| struct sk_buff *skb, *_skb; |
| |
| __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); |
| hsz = skb_headroom(skb) + msg_hdr_sz(msg); |
| |
| if (in_own_node(net, msg_orignode(msg))) |
| scope = TIPC_NODE_SCOPE; |
| |
| /* Create destination port list and message clones: */ |
| tipc_nametbl_mc_translate(net, |
| msg_nametype(msg), msg_namelower(msg), |
| msg_nameupper(msg), scope, &dports); |
| portid = u32_pop(&dports); |
| for (; portid; portid = u32_pop(&dports)) { |
| _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_proto_rcv - receive a connection mng protocol message |
| * @tsk: receiving socket |
| * @skb: pointer to message buffer. |
| */ |
| static void tipc_sk_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb, |
| struct sk_buff_head *xmitq) |
| { |
| struct sock *sk = &tsk->sk; |
| u32 onode = tsk_own_node(tsk); |
| struct tipc_msg *hdr = buf_msg(skb); |
| 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_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 (unlikely(!dest)) { |
| dest = &tsk->peer; |
| if (!syn || dest->family != AF_TIPC) |
| return -EDESTADDRREQ; |
| } |
| |
| if (unlikely(m->msg_namelen < sizeof(*dest))) |
| return -EINVAL; |
| |
| if (unlikely(dest->family != AF_TIPC)) |
| return -EINVAL; |
| |
| 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, !u32_find(clinks, dnode)); |
| 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)) { |
| u32_push(clinks, dnode); |
| 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_INTERVAL); |
| 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; |
| } |
| |
| /** |
| * set_orig_addr - capture sender's address for received message |
| * @m: descriptor for message info |
| * @msg: received message header |
| * |
| * Note: Address is not captured if not requested by receiver. |
| */ |
| static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
| { |
| DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name); |
| |
| if (addr) { |
| addr->family = AF_TIPC; |
| addr->addrtype = TIPC_ADDR_ID; |
| memset(&addr->addr, 0, sizeof(addr->addr)); |
| addr->addr.id.ref = msg_origport(msg); |
| addr->addr.id.node = msg_orignode(msg); |
| addr->addr.name.domain = 0; /* could leave uninitialized */ |
| addr->scope = 0; /* could leave uninitialized */ |
| m->msg_namelen = sizeof(struct sockaddr_tipc); |
| } |
| } |
| |
| /** |
| * tipc_sk_anc_data_recv - optionally capture ancillary data for received message |
| * @m: descriptor for message info |
| * @msg: received message header |
| * @tsk: TIPC port associated with message |
| * |
| * Note: Ancillary data is not captured if not requested by receiver. |
| * |
| * Returns 0 if successful, otherwise errno |
| */ |
| static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
| struct tipc_sock *tsk) |
| { |
| u32 anc_data[3]; |
| u32 err; |
| u32 dest_type; |
| int has_name; |
| int res; |
| |
| if (likely(m->msg_controllen == 0)) |
| return 0; |
| |
| /* Optionally capture errored message object(s) */ |
| err = msg ? msg_errcode(msg) : 0; |
| if (unlikely(err)) { |
| anc_data[0] = err; |
| anc_data[1] = msg_data_sz(msg); |
| res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
| if (res) |
| return res; |
| if (anc_data[1]) { |
| res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], |
| msg_data(msg)); |
| if (res) |
| return res; |
| } |
| } |
| |
| /* Optionally capture message destination object */ |
| dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
| switch (dest_type) { |
| case TIPC_NAMED_MSG: |
| has_name = 1; |
| anc_data[0] = msg_nametype(msg); |
| anc_data[1] = msg_namelower(msg); |
| anc_data[2] = msg_namelower(msg); |
| break; |
| case TIPC_MCAST_MSG: |
| has_name = 1; |
| anc_data[0] = msg_nametype(msg); |
| anc_data[1] = msg_namelower(msg); |
| anc_data[2] = msg_nameupper(msg); |
| break; |
| case TIPC_CONN_MSG: |
| has_name = (tsk->conn_type != 0); |
| anc_data[0] = tsk->conn_type; |
| anc_data[1] = tsk->conn_instance; |
| anc_data[2] = tsk->conn_instance; |
| break; |
| default: |
| has_name = 0; |
| } |
| if (has_name) { |
| res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); |
| if (res) |
| return res; |
| } |
| |
| return 0; |
| } |
| |
| static void tipc_sk_send_ack(struct tipc_sock *tsk) |
| { |
| 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; |
| struct tipc_sock *tsk = tipc_sk(sk); |
| struct sk_buff *skb; |
| struct tipc_msg *hdr; |
| bool connected = !tipc_sk_type_connectionless(sk); |
| int rc, err, hlen, dlen, copy; |
| 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); |
| |
| do { |
| /* Look at first msg in receive queue; wait if necessary */ |
| 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); |
| if (likely(dlen || err)) |
| break; |
| tsk_advance_rx_queue(sk); |
| } while (1); |
| |
| /* Collect msg meta data, including error code and rejected data */ |
| set_orig_addr(m, hdr); |
| 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; |
| |
| /* Caption of data or error code/rejected data was successful */ |
| if (unlikely(flags & MSG_PEEK)) |
| goto exit; |
| |
| tsk_advance_rx_queue(sk); |
| if (likely(!connected)) |
| goto exit; |
| |
| /* Send connection flow control ack 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) { |
| set_orig_addr(m, hdr); |
| 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); |
| } |
| |
| /** |
| * filter_connect - Handle all incoming messages 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 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_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; |
| } |
| |
| /** |
| * 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 |
| * |
| * Returns true if message was added to socket receive queue, otherwise false |
| */ |
| static bool filter_rcv(struct sock *sk, struct sk_buff *skb, |
| struct sk_buff_head *xmitq) |
| { |
| struct tipc_sock *tsk = tipc_sk(sk); |
| struct tipc_msg *hdr = buf_msg(skb); |
| unsigned int limit = rcvbuf_limit(sk, skb); |
| int err = TIPC_OK; |
| int usr = msg_user(hdr); |
| u32 onode; |
| |
| if (unlikely(msg_user(hdr) == CONN_MANAGER)) { |
| tipc_sk_proto_rcv(tsk, skb, xmitq); |
| return false; |
| } |
| |
| if (unlikely(usr == SOCK_WAKEUP)) { |
| onode = msg_orignode(hdr); |
| kfree_skb(skb); |
| u32_del(&tsk->cong_links, onode); |
| tsk->cong_link_cnt--; |
| sk->sk_write_space(sk); |
| return false; |
| } |
| |
| /* Drop if illegal message type */ |
| if (unlikely(msg_type(hdr) > TIPC_DIRECT_MSG)) { |
| kfree_skb(skb); |
| return false; |
| } |
| |
| /* Reject if wrong message type for current socket state */ |
| if (tipc_sk_type_connectionless(sk)) { |
| if (msg_connected(hdr)) { |
| err = TIPC_ERR_NO_PORT; |
| goto reject; |
| } |
| } else if (unlikely(!filter_connect(tsk, skb))) { |
| err = TIPC_ERR_NO_PORT; |
| goto reject; |
| } |
| |
| /* Reject message if there isn't room to queue it */ |
| if (unlikely(sk_rmem_alloc_get(sk) + skb->truesize >= limit)) { |
| err = TIPC_ERR_OVERLOAD; |
| goto reject; |
| } |
| |
| /* Enqueue message */ |
| TIPC_SKB_CB(skb)->bytes_read = 0; |
| __skb_queue_tail(&sk->sk_receive_queue, skb); |
| skb_set_owner_r(skb, sk); |
| |
| sk->sk_data_ready(sk); |
| return true; |
| |
| reject: |
| if (tipc_msg_reverse(tsk_own_node(tsk), &skb, err)) |
| __skb_queue_tail(xmitq, skb); |
| return false; |
| } |
| |
| /** |
| * tipc_backlog_rcv - handle incoming message from backlog queue |
| * @sk: socket |
| * @skb: message |
| * |
| * Caller must hold socket lock |
| * |
| * Returns 0 |
| */ |
| static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
| { |
| unsigned int truesize = skb->truesize; |
| struct sk_buff_head xmitq; |
| u32 dnode, selector; |
| |
| __skb_queue_head_init(&xmitq); |
| |
| if (likely(filter_rcv(sk, skb, &xmitq))) { |
| atomic_add(truesize, &tipc_sk(sk)->dupl_rcvcnt); |
| return 0; |
| } |
| |
| if (skb_queue_empty(&xmitq)) |
| return 0; |
| |
| /* Send response/rejected message */ |
| skb = __skb_dequeue(&xmitq); |
| dnode = msg_destnode(buf_msg(skb)); |
| selector = msg_origport(buf_msg(skb)); |
| tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector); |
| 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)) { |
| 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 */ |
| while ((skb = __skb_dequeue(&xmitq))) { |
| dnode = msg_destnode(buf_msg(skb)); |
| tipc_node_xmit_skb(net, skb, dnode, dport); |
| } |
| 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; |
| |
| lock_sock(sk); |
| |
| /* DGRAM/RDM connect(), just save the destaddr */ |
| if (tipc_sk_type_connectionless(sk)) { |
| if (dst->family == AF_UNSPEC) { |
| memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc)); |
| } else if (destlen != sizeof(struct sockaddr_tipc)) { |
| res = -EINVAL; |
| } else { |
| memcpy(&tsk->peer, dest, destlen); |
| } |
| goto exit; |
| } |
| |
| /* |
| * Reject connection attempt using multicast address |
| * |
| * Note: send_msg() validates the rest of the address fields, |
| * so there's no need to do it here |
| */ |
| if (dst->addrtype == TIPC_ADDR_MCAST) { |
| res = -EINVAL; |
| goto exit; |
| } |
| |
| previous = 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(unsigned long data) |
| { |
| struct tipc_sock *tsk = (struct tipc_sock *)data; |
| struct sock *sk = &tsk->sk; |
| struct sk_buff *skb = NULL; |
| u32 peer_port, peer_node; |
| u32 own_node = tsk_own_node(tsk); |
| |
| bh_lock_sock(sk); |
| if (!tipc_sk_connected(sk)) { |
| bh_unlock_sock(sk); |
| goto exit; |
| } |
| peer_port = tsk_peer_port(tsk); |
| peer_node = tsk_peer_node(tsk); |
| |
| if (tsk->probe_unacked) { |
| if (!sock_owned_by_user(sk)) { |
| 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); |
| } else { |
| /* Try again later */ |
| sk_reset_timer(sk, &sk->sk_timer, (HZ / 20)); |
| } |
| |
| bh_unlock_sock(sk); |
| goto exit; |
| } |
| |
| skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, |
| INT_H_SIZE, 0, peer_node, own_node, |
| peer_port, tsk->portid, TIPC_OK); |
| tsk->probe_unacked = true; |
| sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTERVAL); |
| bh_unlock_sock(sk); |
| if (skb) |
| tipc_node_xmit_skb(sock_net(sk), skb, peer_node, tsk->portid); |
| exit: |
| 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 { |
| tsk = ERR_PTR(rhashtable_walk_start(&iter)); |
| if (tsk) |
| continue; |
| |
| 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); |
| } |
| |
| /** |
| * tipc_setsockopt - set socket option |
| * @sock: socket structure |
| * @lvl: option level |
| * @opt: option identifier |
| * @ov: pointer to new option value |
| * @ol: length of option value |
| * |
| * For stream sockets only, accepts and ignores all IPPROTO_TCP options |
| * (to ease compatibility). |
| * |
| * Returns 0 on success, errno otherwise |
| */ |
| static int tipc_setsockopt(struct socket *sock, int lvl, int opt, |
| char __user *ov, unsigned int ol) |
| { |
| struct sock *sk = sock->sk; |
| struct tipc_sock *tsk = tipc_sk(sk); |
| u32 value = 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; |
| res = get_user(value, (u32 __user *)ov); |
| if (res) |
| return res; |
| 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; |
| default: |
| res = -EINVAL; |
| } |
| |
| release_sock(sk); |
| |
| return res; |
| } |
| |
| /** |
| * tipc_getsockopt - get socket option |
| * @sock: socket structure |
| * @lvl: option level |
| * @opt: option identifier |
| * @ov: receptacle for option value |
| * @ol: receptacle for length of option value |
| * |
| * For stream sockets only, returns 0 length result for all IPPROTO_TCP options |
| * (to ease compatibility). |
| * |
| * Returns 0 on success, errno otherwise |
| */ |
| static int tipc_getsockopt(struct socket *sock, int lvl, int opt, |
| char __user *ov, int __user *ol) |
| { |
| struct sock *sk = sock->sk; |
| struct tipc_sock *tsk = tipc_sk(sk); |
| int len; |
| u32 value; |
| int res; |
| |
| if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
| return put_user(0, ol); |
| if (lvl != SOL_TIPC) |
| return -ENOPROTOOPT; |
| res = get_user(len, ol); |
| if (res) |
| return res; |
| |
| lock_sock(sk); |
| |
| switch (opt) { |
| case TIPC_IMPORTANCE: |
| value = tsk_importance(tsk); |
| break; |
| case TIPC_SRC_DROPPABLE: |
| value = tsk_unreliable(tsk); |
| break; |
| case TIPC_DEST_DROPPABLE: |
| value = tsk_unreturnable(tsk); |
| break; |
| case TIPC_CONN_TIMEOUT: |
| value = tsk->conn_timeout; |
| /* no need to set "res", since already 0 at this point */ |
| break; |
| case TIPC_NODE_RECVQ_DEPTH: |
| value = 0; /* was tipc_queue_size, now obsolete */ |
| break; |
| case TIPC_SOCK_RECVQ_DEPTH: |
| value = skb_queue_len(&sk->sk_receive_queue); |
| break; |
| default: |
| res = -EINVAL; |
| } |
| |
| release_sock(sk); |
| |
| if (res) |
| return res; /* "get" failed */ |
| |
| if (len < sizeof(value)) |
| return -EINVAL; |
| |
| if (copy_to_user(ov, &value, sizeof(value))) |
| return -EFAULT; |
| |
| return put_user(sizeof(value), ol); |
| } |
| |
| static int tipc_ioctl(struct socket *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; |
| } |