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345 lines
10 KiB
345 lines
10 KiB
/* |
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* net/tipc/net.c: TIPC network routing code |
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* |
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* Copyright (c) 1995-2006, 2014, Ericsson AB |
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* Copyright (c) 2005, 2010-2011, Wind River Systems |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the names of the copyright holders nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* Alternatively, this software may be distributed under the terms of the |
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* GNU General Public License ("GPL") version 2 as published by the Free |
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* Software Foundation. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "core.h" |
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#include "net.h" |
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#include "name_distr.h" |
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#include "subscr.h" |
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#include "socket.h" |
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#include "node.h" |
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#include "bcast.h" |
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#include "link.h" |
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#include "netlink.h" |
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#include "monitor.h" |
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/* |
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* The TIPC locking policy is designed to ensure a very fine locking |
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* granularity, permitting complete parallel access to individual |
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* port and node/link instances. The code consists of four major |
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* locking domains, each protected with their own disjunct set of locks. |
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* |
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* 1: The bearer level. |
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* RTNL lock is used to serialize the process of configuring bearer |
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* on update side, and RCU lock is applied on read side to make |
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* bearer instance valid on both paths of message transmission and |
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* reception. |
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* |
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* 2: The node and link level. |
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* All node instances are saved into two tipc_node_list and node_htable |
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* lists. The two lists are protected by node_list_lock on write side, |
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* and they are guarded with RCU lock on read side. Especially node |
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* instance is destroyed only when TIPC module is removed, and we can |
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* confirm that there has no any user who is accessing the node at the |
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* moment. Therefore, Except for iterating the two lists within RCU |
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* protection, it's no needed to hold RCU that we access node instance |
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* in other places. |
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* |
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* In addition, all members in node structure including link instances |
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* are protected by node spin lock. |
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* |
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* 3: The transport level of the protocol. |
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* This consists of the structures port, (and its user level |
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* representations, such as user_port and tipc_sock), reference and |
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* tipc_user (port.c, reg.c, socket.c). |
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* |
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* This layer has four different locks: |
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* - The tipc_port spin_lock. This is protecting each port instance |
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* from parallel data access and removal. Since we can not place |
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* this lock in the port itself, it has been placed in the |
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* corresponding reference table entry, which has the same life |
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* cycle as the module. This entry is difficult to access from |
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* outside the TIPC core, however, so a pointer to the lock has |
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* been added in the port instance, -to be used for unlocking |
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* only. |
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* - A read/write lock to protect the reference table itself (teg.c). |
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* (Nobody is using read-only access to this, so it can just as |
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* well be changed to a spin_lock) |
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* - A spin lock to protect the registry of kernel/driver users (reg.c) |
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* - A global spin_lock (tipc_port_lock), which only task is to ensure |
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* consistency where more than one port is involved in an operation, |
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* i.e., when a port is part of a linked list of ports. |
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* There are two such lists; 'port_list', which is used for management, |
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* and 'wait_list', which is used to queue ports during congestion. |
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* |
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* 4: The name table (name_table.c, name_distr.c, subscription.c) |
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* - There is one big read/write-lock (tipc_nametbl_lock) protecting the |
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* overall name table structure. Nothing must be added/removed to |
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* this structure without holding write access to it. |
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* - There is one local spin_lock per sub_sequence, which can be seen |
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* as a sub-domain to the tipc_nametbl_lock domain. It is used only |
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* for translation operations, and is needed because a translation |
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* steps the root of the 'publication' linked list between each lookup. |
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* This is always used within the scope of a tipc_nametbl_lock(read). |
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* - A local spin_lock protecting the queue of subscriber events. |
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*/ |
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static void tipc_net_finalize(struct net *net, u32 addr); |
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int tipc_net_init(struct net *net, u8 *node_id, u32 addr) |
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{ |
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if (tipc_own_id(net)) { |
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pr_info("Cannot configure node identity twice\n"); |
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return -1; |
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} |
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pr_info("Started in network mode\n"); |
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if (node_id) |
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tipc_set_node_id(net, node_id); |
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if (addr) |
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tipc_net_finalize(net, addr); |
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return 0; |
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} |
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static void tipc_net_finalize(struct net *net, u32 addr) |
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{ |
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struct tipc_net *tn = tipc_net(net); |
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struct tipc_socket_addr sk = {0, addr}; |
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struct tipc_uaddr ua; |
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tipc_uaddr(&ua, TIPC_SERVICE_RANGE, TIPC_CLUSTER_SCOPE, |
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TIPC_NODE_STATE, addr, addr); |
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if (cmpxchg(&tn->node_addr, 0, addr)) |
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return; |
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tipc_set_node_addr(net, addr); |
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tipc_named_reinit(net); |
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tipc_sk_reinit(net); |
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tipc_mon_reinit_self(net); |
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tipc_nametbl_publish(net, &ua, &sk, addr); |
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} |
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void tipc_net_finalize_work(struct work_struct *work) |
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{ |
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struct tipc_net *tn = container_of(work, struct tipc_net, work); |
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tipc_net_finalize(tipc_link_net(tn->bcl), tn->trial_addr); |
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} |
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void tipc_net_stop(struct net *net) |
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{ |
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if (!tipc_own_id(net)) |
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return; |
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rtnl_lock(); |
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tipc_bearer_stop(net); |
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tipc_node_stop(net); |
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rtnl_unlock(); |
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pr_info("Left network mode\n"); |
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} |
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static int __tipc_nl_add_net(struct net *net, struct tipc_nl_msg *msg) |
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{ |
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struct tipc_net *tn = net_generic(net, tipc_net_id); |
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u64 *w0 = (u64 *)&tn->node_id[0]; |
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u64 *w1 = (u64 *)&tn->node_id[8]; |
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struct nlattr *attrs; |
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void *hdr; |
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hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
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NLM_F_MULTI, TIPC_NL_NET_GET); |
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if (!hdr) |
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return -EMSGSIZE; |
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attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_NET); |
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if (!attrs) |
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goto msg_full; |
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if (nla_put_u32(msg->skb, TIPC_NLA_NET_ID, tn->net_id)) |
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goto attr_msg_full; |
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if (nla_put_u64_64bit(msg->skb, TIPC_NLA_NET_NODEID, *w0, 0)) |
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goto attr_msg_full; |
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if (nla_put_u64_64bit(msg->skb, TIPC_NLA_NET_NODEID_W1, *w1, 0)) |
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goto attr_msg_full; |
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nla_nest_end(msg->skb, attrs); |
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genlmsg_end(msg->skb, hdr); |
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return 0; |
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attr_msg_full: |
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nla_nest_cancel(msg->skb, attrs); |
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msg_full: |
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genlmsg_cancel(msg->skb, hdr); |
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return -EMSGSIZE; |
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} |
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int tipc_nl_net_dump(struct sk_buff *skb, struct netlink_callback *cb) |
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{ |
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struct net *net = sock_net(skb->sk); |
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int err; |
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int done = cb->args[0]; |
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struct tipc_nl_msg msg; |
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if (done) |
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return 0; |
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msg.skb = skb; |
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msg.portid = NETLINK_CB(cb->skb).portid; |
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msg.seq = cb->nlh->nlmsg_seq; |
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err = __tipc_nl_add_net(net, &msg); |
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if (err) |
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goto out; |
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done = 1; |
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out: |
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cb->args[0] = done; |
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return skb->len; |
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} |
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int __tipc_nl_net_set(struct sk_buff *skb, struct genl_info *info) |
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{ |
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struct nlattr *attrs[TIPC_NLA_NET_MAX + 1]; |
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struct net *net = sock_net(skb->sk); |
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struct tipc_net *tn = tipc_net(net); |
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int err; |
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if (!info->attrs[TIPC_NLA_NET]) |
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return -EINVAL; |
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err = nla_parse_nested_deprecated(attrs, TIPC_NLA_NET_MAX, |
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info->attrs[TIPC_NLA_NET], |
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tipc_nl_net_policy, info->extack); |
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if (err) |
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return err; |
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/* Can't change net id once TIPC has joined a network */ |
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if (tipc_own_addr(net)) |
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return -EPERM; |
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if (attrs[TIPC_NLA_NET_ID]) { |
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u32 val; |
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val = nla_get_u32(attrs[TIPC_NLA_NET_ID]); |
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if (val < 1 || val > 9999) |
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return -EINVAL; |
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tn->net_id = val; |
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} |
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if (attrs[TIPC_NLA_NET_ADDR]) { |
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u32 addr; |
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addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]); |
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if (!addr) |
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return -EINVAL; |
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tn->legacy_addr_format = true; |
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tipc_net_init(net, NULL, addr); |
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} |
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if (attrs[TIPC_NLA_NET_NODEID]) { |
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u8 node_id[NODE_ID_LEN]; |
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u64 *w0 = (u64 *)&node_id[0]; |
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u64 *w1 = (u64 *)&node_id[8]; |
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if (!attrs[TIPC_NLA_NET_NODEID_W1]) |
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return -EINVAL; |
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*w0 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID]); |
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*w1 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID_W1]); |
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tipc_net_init(net, node_id, 0); |
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} |
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return 0; |
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} |
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int tipc_nl_net_set(struct sk_buff *skb, struct genl_info *info) |
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{ |
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int err; |
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rtnl_lock(); |
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err = __tipc_nl_net_set(skb, info); |
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rtnl_unlock(); |
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return err; |
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} |
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static int __tipc_nl_addr_legacy_get(struct net *net, struct tipc_nl_msg *msg) |
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{ |
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struct tipc_net *tn = tipc_net(net); |
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struct nlattr *attrs; |
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void *hdr; |
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hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
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0, TIPC_NL_ADDR_LEGACY_GET); |
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if (!hdr) |
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return -EMSGSIZE; |
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attrs = nla_nest_start(msg->skb, TIPC_NLA_NET); |
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if (!attrs) |
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goto msg_full; |
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if (tn->legacy_addr_format) |
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if (nla_put_flag(msg->skb, TIPC_NLA_NET_ADDR_LEGACY)) |
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goto attr_msg_full; |
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nla_nest_end(msg->skb, attrs); |
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genlmsg_end(msg->skb, hdr); |
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return 0; |
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attr_msg_full: |
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nla_nest_cancel(msg->skb, attrs); |
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msg_full: |
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genlmsg_cancel(msg->skb, hdr); |
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return -EMSGSIZE; |
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} |
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int tipc_nl_net_addr_legacy_get(struct sk_buff *skb, struct genl_info *info) |
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{ |
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struct net *net = sock_net(skb->sk); |
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struct tipc_nl_msg msg; |
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struct sk_buff *rep; |
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int err; |
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rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
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if (!rep) |
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return -ENOMEM; |
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msg.skb = rep; |
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msg.portid = info->snd_portid; |
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msg.seq = info->snd_seq; |
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err = __tipc_nl_addr_legacy_get(net, &msg); |
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if (err) { |
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nlmsg_free(msg.skb); |
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return err; |
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} |
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return genlmsg_reply(msg.skb, info); |
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}
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