[mirror_ubuntu-jammy-kernel.git] / net / tipc / net.c

/*
 * 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"
#include "monitor.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., when 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.
*/

static void tipc_net_finalize(struct net *net, u32 addr);

int tipc_net_init(struct net *net, u8 *node_id, u32 addr)
{
	if (tipc_own_id(net)) {
		pr_info("Cannot configure node identity twice\n");
		return -1;
	}
	pr_info("Started in network mode\n");

	if (node_id)
		tipc_set_node_id(net, node_id);
	if (addr)
		tipc_net_finalize(net, addr);
	return 0;
}

static void tipc_net_finalize(struct net *net, u32 addr)
{
	struct tipc_net *tn = tipc_net(net);

	if (cmpxchg(&tn->node_addr, 0, addr))
		return;
	tipc_set_node_addr(net, addr);
	tipc_named_reinit(net);
	tipc_sk_reinit(net);
	tipc_mon_reinit_self(net);
	tipc_nametbl_publish(net, TIPC_NODE_STATE, addr, addr,
			     TIPC_CLUSTER_SCOPE, 0, addr);
}

void tipc_net_finalize_work(struct work_struct *work)
{
	struct tipc_net_work *fwork;

	fwork = container_of(work, struct tipc_net_work, work);
	tipc_net_finalize(fwork->net, fwork->addr);
}

void tipc_sched_net_finalize(struct net *net, u32 addr)
{
	struct tipc_net *tn = tipc_net(net);

	tn->final_work.net = net;
	tn->final_work.addr = addr;
	schedule_work(&tn->final_work.work);
}

void tipc_net_stop(struct net *net)
{
	if (!tipc_own_id(net))
		return;

	rtnl_lock();
	tipc_bearer_stop(net);
	tipc_node_stop(net);
	rtnl_unlock();

	pr_info("Left network mode\n");
}

static int __tipc_nl_add_net(struct net *net, struct tipc_nl_msg *msg)
{
	struct tipc_net *tn = net_generic(net, tipc_net_id);
	u64 *w0 = (u64 *)&tn->node_id[0];
	u64 *w1 = (u64 *)&tn->node_id[8];
	struct nlattr *attrs;
	void *hdr;

	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_noflag(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;
	if (nla_put_u64_64bit(msg->skb, TIPC_NLA_NET_NODEID, *w0, 0))
		goto attr_msg_full;
	if (nla_put_u64_64bit(msg->skb, TIPC_NLA_NET_NODEID_W1, *w1, 0))
		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;
}

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;
}

int __tipc_nl_net_set(struct sk_buff *skb, struct genl_info *info)
{
	struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
	struct net *net = sock_net(skb->sk);
	struct tipc_net *tn = tipc_net(net);
	int err;

	if (!info->attrs[TIPC_NLA_NET])
		return -EINVAL;

	err = nla_parse_nested_deprecated(attrs, TIPC_NLA_NET_MAX,
					  info->attrs[TIPC_NLA_NET],
					  tipc_nl_net_policy, info->extack);

	if (err)
		return err;

	/* Can't change net id once TIPC has joined a network */
	if (tipc_own_addr(net))
		return -EPERM;

	if (attrs[TIPC_NLA_NET_ID]) {
		u32 val;

		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;

		addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
		if (!addr)
			return -EINVAL;
		tn->legacy_addr_format = true;
		tipc_net_init(net, NULL, addr);
	}

	if (attrs[TIPC_NLA_NET_NODEID]) {
		u8 node_id[NODE_ID_LEN];
		u64 *w0 = (u64 *)&node_id[0];
		u64 *w1 = (u64 *)&node_id[8];

		if (!attrs[TIPC_NLA_NET_NODEID_W1])
			return -EINVAL;
		*w0 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID]);
		*w1 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID_W1]);
		tipc_net_init(net, node_id, 0);
	}
	return 0;
}

int tipc_nl_net_set(struct sk_buff *skb, struct genl_info *info)
{
	int err;

	rtnl_lock();
	err = __tipc_nl_net_set(skb, info);
	rtnl_unlock();

	return err;
}

static int __tipc_nl_addr_legacy_get(struct net *net, struct tipc_nl_msg *msg)
{
	struct tipc_net *tn = tipc_net(net);
	struct nlattr *attrs;
	void *hdr;

	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
			  0, TIPC_NL_ADDR_LEGACY_GET);
	if (!hdr)
		return -EMSGSIZE;

	attrs = nla_nest_start(msg->skb, TIPC_NLA_NET);
	if (!attrs)
		goto msg_full;

	if (tn->legacy_addr_format)
		if (nla_put_flag(msg->skb, TIPC_NLA_NET_ADDR_LEGACY))
			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;
}

int tipc_nl_net_addr_legacy_get(struct sk_buff *skb, struct genl_info *info)
{
	struct net *net = sock_net(skb->sk);
	struct tipc_nl_msg msg;
	struct sk_buff *rep;
	int err;

	rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!rep)
		return -ENOMEM;

	msg.skb = rep;
	msg.portid = info->snd_portid;
	msg.seq = info->snd_seq;

	err = __tipc_nl_addr_legacy_get(net, &msg);
	if (err) {
		nlmsg_free(msg.skb);
		return err;
	}

	return genlmsg_reply(msg.skb, info);
}
Commit	Line	Data
b97bf3fd PL	1	/*
b97bf3fd PL	2	* net/tipc/net.c: TIPC network routing code
c4307285	3	*
5a379074	4	* Copyright (c) 1995-2006, 2014, Ericsson AB
9df3b7eb	5	* Copyright (c) 2005, 2010-2011, Wind River Systems
b97bf3fd PL	6	* All rights reserved.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions are met:
	10	*
9ea1fd3c PL	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. Neither the names of the copyright holders nor the names of its
	17	* contributors may be used to endorse or promote products derived from
	18	* this software without specific prior written permission.
	19	*
	20	* Alternatively, this software may be distributed under the terms of the
	21	* GNU General Public License ("GPL") version 2 as published by the Free
	22	* Software Foundation.
b97bf3fd PL	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	25	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	28	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	29	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	30	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	31	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	32	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	33	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	34	* POSSIBILITY OF SUCH DAMAGE.
	35	*/
	36
	37	#include "core.h"
b97bf3fd	38	#include "net.h"
b97bf3fd PL	39	#include "name_distr.h"
b97bf3fd PL	40	#include "subscr.h"
9816f061	41	#include "socket.h"
672d99e1	42	#include "node.h"
a6bf70f7	43	#include "bcast.h"
49cc66ea	44	#include "netlink.h"
46cb01ee	45	#include "monitor.h"
fd3cf2ad	46
c4307285	47	/*
b97bf3fd PL	48	* The TIPC locking policy is designed to ensure a very fine locking
b97bf3fd PL	49	* granularity, permitting complete parallel access to individual
7216cd94	50	* port and node/link instances. The code consists of four major
b97bf3fd PL	51	* locking domains, each protected with their own disjunct set of locks.
b97bf3fd PL	52	*
7216cd94 YX	53	* 1: The bearer level.
	54	* RTNL lock is used to serialize the process of configuring bearer
	55	* on update side, and RCU lock is applied on read side to make
	56	* bearer instance valid on both paths of message transmission and
	57	* reception.
b97bf3fd	58	*
7216cd94 YX	59	* 2: The node and link level.
	60	* All node instances are saved into two tipc_node_list and node_htable
	61	* lists. The two lists are protected by node_list_lock on write side,
	62	* and they are guarded with RCU lock on read side. Especially node
	63	* instance is destroyed only when TIPC module is removed, and we can
	64	* confirm that there has no any user who is accessing the node at the
	65	* moment. Therefore, Except for iterating the two lists within RCU
	66	* protection, it's no needed to hold RCU that we access node instance
	67	* in other places.
b97bf3fd	68	*
7216cd94 YX	69	* In addition, all members in node structure including link instances
7216cd94 YX	70	* are protected by node spin lock.
c4307285	71	*
7216cd94 YX	72	* 3: The transport level of the protocol.
	73	* This consists of the structures port, (and its user level
	74	* representations, such as user_port and tipc_sock), reference and
	75	* tipc_user (port.c, reg.c, socket.c).
b97bf3fd	76	*
7216cd94	77	* This layer has four different locks:
b97bf3fd	78	* - The tipc_port spin_lock. This is protecting each port instance
c4307285 YH	79	* from parallel data access and removal. Since we can not place
c4307285 YH	80	* this lock in the port itself, it has been placed in the
b97bf3fd	81	* corresponding reference table entry, which has the same life
c4307285 YH	82	* cycle as the module. This entry is difficult to access from
	83	* outside the TIPC core, however, so a pointer to the lock has
	84	* been added in the port instance, -to be used for unlocking
b97bf3fd	85	* only.
c4307285 YH	86	* - A read/write lock to protect the reference table itself (teg.c).
c4307285 YH	87	* (Nobody is using read-only access to this, so it can just as
b97bf3fd PL	88	* well be changed to a spin_lock)
b97bf3fd PL	89	* - A spin lock to protect the registry of kernel/driver users (reg.c)
c4307285	90	* - A global spin_lock (tipc_port_lock), which only task is to ensure
b97bf3fd	91	* consistency where more than one port is involved in an operation,
a79ace4b	92	* i.e., when a port is part of a linked list of ports.
b97bf3fd PL	93	* There are two such lists; 'port_list', which is used for management,
b97bf3fd PL	94	* and 'wait_list', which is used to queue ports during congestion.
c4307285	95	*
7216cd94	96	* 4: The name table (name_table.c, name_distr.c, subscription.c)
c4307285 YH	97	* - There is one big read/write-lock (tipc_nametbl_lock) protecting the
c4307285 YH	98	* overall name table structure. Nothing must be added/removed to
b97bf3fd PL	99	* this structure without holding write access to it.
b97bf3fd PL	100	* - There is one local spin_lock per sub_sequence, which can be seen
4323add6	101	* as a sub-domain to the tipc_nametbl_lock domain. It is used only
b97bf3fd PL	102	* for translation operations, and is needed because a translation
b97bf3fd PL	103	* steps the root of the 'publication' linked list between each lookup.
4323add6	104	* This is always used within the scope of a tipc_nametbl_lock(read).
b97bf3fd PL	105	* - A local spin_lock protecting the queue of subscriber events.
b97bf3fd PL	106	*/
b97bf3fd	107
adba75be JM	108	static void tipc_net_finalize(struct net *net, u32 addr);
adba75be JM	109
d50ccc2d	110	int tipc_net_init(struct net net, u8 node_id, u32 addr)
b97bf3fd	111	{
d50ccc2d JM	112	if (tipc_own_id(net)) {
	113	pr_info("Cannot configure node identity twice\n");
	114	return -1;
	115	}
	116	pr_info("Started in network mode\n");
b97bf3fd	117
25b0b9c4	118	if (node_id)
d50ccc2d	119	tipc_set_node_id(net, node_id);
d50ccc2d JM	120	if (addr)
	121	tipc_net_finalize(net, addr);
	122	return 0;
	123	}
40f9f439	124
adba75be	125	static void tipc_net_finalize(struct net *net, u32 addr)
d50ccc2d	126	{
9faa89d4 JM	127	struct tipc_net *tn = tipc_net(net);
9faa89d4 JM	128
adba75be JM	129	if (cmpxchg(&tn->node_addr, 0, addr))
	130	return;
	131	tipc_set_node_addr(net, addr);
	132	tipc_named_reinit(net);
	133	tipc_sk_reinit(net);
46cb01ee	134	tipc_mon_reinit_self(net);
b6f88d9c	135	tipc_nametbl_publish(net, TIPC_NODE_STATE, addr, addr,
adba75be JM	136	TIPC_CLUSTER_SCOPE, 0, addr);
	137	}
	138
d966ddcc	139	void tipc_net_finalize_work(struct work_struct *work)
adba75be JM	140	{
	141	struct tipc_net_work *fwork;
	142
	143	fwork = container_of(work, struct tipc_net_work, work);
	144	tipc_net_finalize(fwork->net, fwork->addr);
adba75be JM	145	}
	146
	147	void tipc_sched_net_finalize(struct net *net, u32 addr)
	148	{
d966ddcc	149	struct tipc_net *tn = tipc_net(net);
adba75be	150
d966ddcc HHL	151	tn->final_work.net = net;
	152	tn->final_work.addr = addr;
	153	schedule_work(&tn->final_work.work);
b97bf3fd PL	154	}
b97bf3fd PL	155
f2f9800d	156	void tipc_net_stop(struct net *net)
b97bf3fd	157	{
9926cb5f	158	if (!tipc_own_id(net))
b97bf3fd	159	return;
46651c59	160
f97e455a	161	rtnl_lock();
f2f9800d	162	tipc_bearer_stop(net);
f2f9800d	163	tipc_node_stop(net);
f97e455a	164	rtnl_unlock();
46651c59	165
2cf8aa19	166	pr_info("Left network mode\n");
b97bf3fd	167	}
fd3cf2ad	168
c93d3baa	169	static int __tipc_nl_add_net(struct net net, struct tipc_nl_msg msg)
fd3cf2ad	170	{
c93d3baa	171	struct tipc_net *tn = net_generic(net, tipc_net_id);
d50ccc2d JM	172	u64 w0 = (u64 )&tn->node_id[0];
d50ccc2d JM	173	u64 w1 = (u64 )&tn->node_id[8];
fd3cf2ad	174	struct nlattr *attrs;
d50ccc2d	175	void *hdr;
fd3cf2ad	176
bfb3e5dd	177	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
fd3cf2ad RA	178	NLM_F_MULTI, TIPC_NL_NET_GET);
	179	if (!hdr)
	180	return -EMSGSIZE;
	181
ae0be8de	182	attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_NET);
fd3cf2ad RA	183	if (!attrs)
	184	goto msg_full;
	185
c93d3baa	186	if (nla_put_u32(msg->skb, TIPC_NLA_NET_ID, tn->net_id))
fd3cf2ad	187	goto attr_msg_full;
d50ccc2d JM	188	if (nla_put_u64_64bit(msg->skb, TIPC_NLA_NET_NODEID, *w0, 0))
	189	goto attr_msg_full;
	190	if (nla_put_u64_64bit(msg->skb, TIPC_NLA_NET_NODEID_W1, *w1, 0))
	191	goto attr_msg_full;
fd3cf2ad RA	192	nla_nest_end(msg->skb, attrs);
	193	genlmsg_end(msg->skb, hdr);
	194
	195	return 0;
	196
	197	attr_msg_full:
	198	nla_nest_cancel(msg->skb, attrs);
	199	msg_full:
	200	genlmsg_cancel(msg->skb, hdr);
	201
	202	return -EMSGSIZE;
	203	}
	204
	205	int tipc_nl_net_dump(struct sk_buff skb, struct netlink_callback cb)
	206	{
c93d3baa	207	struct net *net = sock_net(skb->sk);
fd3cf2ad RA	208	int err;
	209	int done = cb->args[0];
	210	struct tipc_nl_msg msg;
	211
	212	if (done)
	213	return 0;
	214
	215	msg.skb = skb;
	216	msg.portid = NETLINK_CB(cb->skb).portid;
	217	msg.seq = cb->nlh->nlmsg_seq;
	218
c93d3baa	219	err = __tipc_nl_add_net(net, &msg);
fd3cf2ad RA	220	if (err)
	221	goto out;
	222
	223	done = 1;
	224	out:
	225	cb->args[0] = done;
	226
	227	return skb->len;
	228	}
27c21416	229
5631f65d	230	int __tipc_nl_net_set(struct sk_buff skb, struct genl_info info)
27c21416	231	{
27c21416	232	struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
23fd3eac JM	233	struct net *net = sock_net(skb->sk);
23fd3eac JM	234	struct tipc_net *tn = tipc_net(net);
c93d3baa	235	int err;
27c21416 RA	236
	237	if (!info->attrs[TIPC_NLA_NET])
	238	return -EINVAL;
	239
8cb08174 JB	240	err = nla_parse_nested_deprecated(attrs, TIPC_NLA_NET_MAX,
	241	info->attrs[TIPC_NLA_NET],
	242	tipc_nl_net_policy, info->extack);
d50ccc2d	243
27c21416 RA	244	if (err)
	245	return err;
	246
23fd3eac JM	247	/* Can't change net id once TIPC has joined a network */
	248	if (tipc_own_addr(net))
	249	return -EPERM;
	250
27c21416 RA	251	if (attrs[TIPC_NLA_NET_ID]) {
	252	u32 val;
	253
27c21416 RA	254	val = nla_get_u32(attrs[TIPC_NLA_NET_ID]);
	255	if (val < 1 \|\| val > 9999)
	256	return -EINVAL;
	257
c93d3baa	258	tn->net_id = val;
27c21416 RA	259	}
	260
	261	if (attrs[TIPC_NLA_NET_ADDR]) {
	262	u32 addr;
	263
27c21416	264	addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
20263641	265	if (!addr)
27c21416	266	return -EINVAL;
b89afb11	267	tn->legacy_addr_format = true;
d50ccc2d	268	tipc_net_init(net, NULL, addr);
27c21416 RA	269	}
27c21416 RA	270
d50ccc2d JM	271	if (attrs[TIPC_NLA_NET_NODEID]) {
	272	u8 node_id[NODE_ID_LEN];
	273	u64 w0 = (u64 )&node_id[0];
	274	u64 w1 = (u64 )&node_id[8];
	275
c6404122 ED	276	if (!attrs[TIPC_NLA_NET_NODEID_W1])
c6404122 ED	277	return -EINVAL;
d50ccc2d JM	278	*w0 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID]);
	279	*w1 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID_W1]);
	280	tipc_net_init(net, node_id, 0);
	281	}
27c21416 RA	282	return 0;
27c21416 RA	283	}
5631f65d YX	284
	285	int tipc_nl_net_set(struct sk_buff skb, struct genl_info info)
	286	{
	287	int err;
	288
	289	rtnl_lock();
	290	err = __tipc_nl_net_set(skb, info);
	291	rtnl_unlock();
	292
	293	return err;
	294	}
e1b5e598 JR	295
	296	static int __tipc_nl_addr_legacy_get(struct net net, struct tipc_nl_msg msg)
	297	{
	298	struct tipc_net *tn = tipc_net(net);
	299	struct nlattr *attrs;
	300	void *hdr;
	301
	302	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
	303	0, TIPC_NL_ADDR_LEGACY_GET);
	304	if (!hdr)
	305	return -EMSGSIZE;
	306
	307	attrs = nla_nest_start(msg->skb, TIPC_NLA_NET);
	308	if (!attrs)
	309	goto msg_full;
	310
	311	if (tn->legacy_addr_format)
	312	if (nla_put_flag(msg->skb, TIPC_NLA_NET_ADDR_LEGACY))
	313	goto attr_msg_full;
	314
	315	nla_nest_end(msg->skb, attrs);
	316	genlmsg_end(msg->skb, hdr);
	317
	318	return 0;
	319
	320	attr_msg_full:
	321	nla_nest_cancel(msg->skb, attrs);
	322	msg_full:
	323	genlmsg_cancel(msg->skb, hdr);
	324
	325	return -EMSGSIZE;
	326	}
	327
	328	int tipc_nl_net_addr_legacy_get(struct sk_buff skb, struct genl_info info)
	329	{
	330	struct net *net = sock_net(skb->sk);
	331	struct tipc_nl_msg msg;
	332	struct sk_buff *rep;
	333	int err;
	334
	335	rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	336	if (!rep)
	337	return -ENOMEM;
	338
	339	msg.skb = rep;
	340	msg.portid = info->snd_portid;
	341	msg.seq = info->snd_seq;
	342
	343	err = __tipc_nl_addr_legacy_get(net, &msg);
	344	if (err) {
	345	nlmsg_free(msg.skb);
	346	return err;
	347	}
	348
	349	return genlmsg_reply(msg.skb, info);
	350	}