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Release 4.14 net/tipc/net.c

Directory: net/tipc
/*
 * net/tipc/net.c: TIPC network routing code
 *
 * Copyright (c) 1995-2006, 2014, Ericsson AB
 * Copyright (c) 2005, 2010-2011, 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 "core.h"
#include "net.h"
#include "name_distr.h"
#include "subscr.h"
#include "socket.h"
#include "node.h"
#include "bcast.h"
#include "netlink.h"

/*
 * The TIPC locking policy is designed to ensure a very fine locking
 * granularity, permitting complete parallel access to individual
 * port and node/link instances. The code consists of four major
 * locking domains, each protected with their own disjunct set of locks.
 *
 * 1: The bearer level.
 *    RTNL lock is used to serialize the process of configuring bearer
 *    on update side, and RCU lock is applied on read side to make
 *    bearer instance valid on both paths of message transmission and
 *    reception.
 *
 * 2: The node and link level.
 *    All node instances are saved into two tipc_node_list and node_htable
 *    lists. The two lists are protected by node_list_lock on write side,
 *    and they are guarded with RCU lock on read side. Especially node
 *    instance is destroyed only when TIPC module is removed, and we can
 *    confirm that there has no any user who is accessing the node at the
 *    moment. Therefore, Except for iterating the two lists within RCU
 *    protection, it's no needed to hold RCU that we access node instance
 *    in other places.
 *
 *    In addition, all members in node structure including link instances
 *    are protected by node spin lock.
 *
 * 3: The transport level of the protocol.
 *    This consists of the structures port, (and its user level
 *    representations, such as user_port and tipc_sock), reference and
 *    tipc_user (port.c, reg.c, socket.c).
 *
 *    This layer has four different locks:
 *     - The tipc_port spin_lock. This is protecting each port instance
 *       from parallel data access and removal. Since we can not place
 *       this lock in the port itself, it has been placed in the
 *       corresponding reference table entry, which has the same life
 *       cycle as the module. This entry is difficult to access from
 *       outside the TIPC core, however, so a pointer to the lock has
 *       been added in the port instance, -to be used for unlocking
 *       only.
 *     - A read/write lock to protect the reference table itself (teg.c).
 *       (Nobody is using read-only access to this, so it can just as
 *       well be changed to a spin_lock)
 *     - A spin lock to protect the registry of kernel/driver users (reg.c)
 *     - A global spin_lock (tipc_port_lock), which only task is to ensure
 *       consistency where more than one port is involved in an operation,
 *       i.e., whe a port is part of a linked list of ports.
 *       There are two such lists; 'port_list', which is used for management,
 *       and 'wait_list', which is used to queue ports during congestion.
 *
 *  4: The name table (name_table.c, name_distr.c, subscription.c)
 *     - There is one big read/write-lock (tipc_nametbl_lock) protecting the
 *       overall name table structure. Nothing must be added/removed to
 *       this structure without holding write access to it.
 *     - There is one local spin_lock per sub_sequence, which can be seen
 *       as a sub-domain to the tipc_nametbl_lock domain. It is used only
 *       for translation operations, and is needed because a translation
 *       steps the root of the 'publication' linked list between each lookup.
 *       This is always used within the scope of a tipc_nametbl_lock(read).
 *     - A local spin_lock protecting the queue of subscriber events.
*/


int tipc_net_start(struct net *net, u32 addr) { struct tipc_net *tn = net_generic(net, tipc_net_id); char addr_string[16]; tn->own_addr = addr; /* Ensure that the new address is visible before we reinit. */ smp_mb(); tipc_named_reinit(net); tipc_sk_reinit(net); tipc_nametbl_publish(net, TIPC_CFG_SRV, tn->own_addr, tn->own_addr, TIPC_ZONE_SCOPE, 0, tn->own_addr); pr_info("Started in network mode\n"); pr_info("Own node address %s, network identity %u\n", tipc_addr_string_fill(addr_string, tn->own_addr), tn->net_id); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Ying Xue4747.00%642.86%
Per Liden2828.00%214.29%
Erik Hugne1414.00%214.29%
Allan Stephens66.00%214.29%
Herbert Xu44.00%17.14%
Jon Paul Maloy11.00%17.14%
Total100100.00%14100.00%


void tipc_net_stop(struct net *net) { struct tipc_net *tn = net_generic(net, tipc_net_id); if (!tn->own_addr) return; tipc_nametbl_withdraw(net, TIPC_CFG_SRV, tn->own_addr, 0, tn->own_addr); rtnl_lock(); tipc_bearer_stop(net); tipc_node_stop(net); rtnl_unlock(); pr_info("Left network mode\n"); }

Contributors

PersonTokensPropCommitsCommitProp
Ying Xue4058.82%436.36%
Per Liden1420.59%218.18%
Erik Hugne1014.71%218.18%
Allan Stephens34.41%218.18%
Frans Pop11.47%19.09%
Total68100.00%11100.00%


static int __tipc_nl_add_net(struct net *net, struct tipc_nl_msg *msg) { struct tipc_net *tn = net_generic(net, tipc_net_id); void *hdr; struct nlattr *attrs; hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, NLM_F_MULTI, TIPC_NL_NET_GET); if (!hdr) return -EMSGSIZE; attrs = nla_nest_start(msg->skb, TIPC_NLA_NET); if (!attrs) goto msg_full; if (nla_put_u32(msg->skb, TIPC_NLA_NET_ID, tn->net_id)) goto attr_msg_full; nla_nest_end(msg->skb, attrs); genlmsg_end(msg->skb, hdr); return 0; attr_msg_full: nla_nest_cancel(msg->skb, attrs); msg_full: genlmsg_cancel(msg->skb, hdr); return -EMSGSIZE; }

Contributors

PersonTokensPropCommitsCommitProp
Richard Alpe13487.01%266.67%
Ying Xue2012.99%133.33%
Total154100.00%3100.00%


int tipc_nl_net_dump(struct sk_buff *skb, struct netlink_callback *cb) { struct net *net = sock_net(skb->sk); int err; int done = cb->args[0]; struct tipc_nl_msg msg; if (done) return 0; msg.skb = skb; msg.portid = NETLINK_CB(cb->skb).portid; msg.seq = cb->nlh->nlmsg_seq; err = __tipc_nl_add_net(net, &msg); if (err) goto out; done = 1; out: cb->args[0] = done; return skb->len; }

Contributors

PersonTokensPropCommitsCommitProp
Richard Alpe10388.03%150.00%
Ying Xue1411.97%150.00%
Total117100.00%2100.00%


int tipc_nl_net_set(struct sk_buff *skb, struct genl_info *info) { struct net *net = sock_net(skb->sk); struct tipc_net *tn = net_generic(net, tipc_net_id); struct nlattr *attrs[TIPC_NLA_NET_MAX + 1]; int err; if (!info->attrs[TIPC_NLA_NET]) return -EINVAL; err = nla_parse_nested(attrs, TIPC_NLA_NET_MAX, info->attrs[TIPC_NLA_NET], tipc_nl_net_policy, info->extack); if (err) return err; if (attrs[TIPC_NLA_NET_ID]) { u32 val; /* Can't change net id once TIPC has joined a network */ if (tn->own_addr) return -EPERM; val = nla_get_u32(attrs[TIPC_NLA_NET_ID]); if (val < 1 || val > 9999) return -EINVAL; tn->net_id = val; } if (attrs[TIPC_NLA_NET_ADDR]) { u32 addr; /* Can't change net addr once TIPC has joined a network */ if (tn->own_addr) return -EPERM; addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]); if (!tipc_addr_node_valid(addr)) return -EINVAL; rtnl_lock(); tipc_net_start(net, addr); rtnl_unlock(); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Richard Alpe17282.30%233.33%
Ying Xue3315.79%233.33%
Johannes Berg41.91%233.33%
Total209100.00%6100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Richard Alpe41261.13%516.13%
Ying Xue15523.00%929.03%
Per Liden568.31%26.45%
Erik Hugne243.56%26.45%
Allan Stephens101.48%516.13%
Jon Paul Maloy81.19%412.90%
Herbert Xu40.59%13.23%
Johannes Berg40.59%26.45%
Frans Pop10.15%13.23%
Total674100.00%31100.00%
Directory: net/tipc
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