[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 "link.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);
	struct tipc_socket_addr sk = {0, addr};
	struct tipc_uaddr ua;

	tipc_uaddr(&ua, TIPC_SERVICE_RANGE, TIPC_CLUSTER_SCOPE,
		   TIPC_NODE_STATE, addr, addr);

	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, &ua, &sk, addr);
}

void tipc_net_finalize_work(struct work_struct *work)
{
	struct tipc_net *tn = container_of(work, struct tipc_net, work);

	tipc_net_finalize(tipc_link_net(tn->bcl), tn->trial_addr);
}

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"
be07f056	44	#include "link.h"
49cc66ea	45	#include "netlink.h"
46cb01ee	46	#include "monitor.h"
fd3cf2ad	47
c4307285	48	/*
b97bf3fd PL	49	* The TIPC locking policy is designed to ensure a very fine locking
b97bf3fd PL	50	* granularity, permitting complete parallel access to individual
7216cd94	51	* port and node/link instances. The code consists of four major
b97bf3fd PL	52	* locking domains, each protected with their own disjunct set of locks.
b97bf3fd PL	53	*
7216cd94 YX	54	* 1: The bearer level.
	55	* RTNL lock is used to serialize the process of configuring bearer
	56	* on update side, and RCU lock is applied on read side to make
	57	* bearer instance valid on both paths of message transmission and
	58	* reception.
b97bf3fd	59	*
7216cd94 YX	60	* 2: The node and link level.
	61	* All node instances are saved into two tipc_node_list and node_htable
	62	* lists. The two lists are protected by node_list_lock on write side,
	63	* and they are guarded with RCU lock on read side. Especially node
	64	* instance is destroyed only when TIPC module is removed, and we can
	65	* confirm that there has no any user who is accessing the node at the
	66	* moment. Therefore, Except for iterating the two lists within RCU
	67	* protection, it's no needed to hold RCU that we access node instance
	68	* in other places.
b97bf3fd	69	*
7216cd94 YX	70	* In addition, all members in node structure including link instances
7216cd94 YX	71	* are protected by node spin lock.
c4307285	72	*
7216cd94 YX	73	* 3: The transport level of the protocol.
	74	* This consists of the structures port, (and its user level
	75	* representations, such as user_port and tipc_sock), reference and
	76	* tipc_user (port.c, reg.c, socket.c).
b97bf3fd	77	*
7216cd94	78	* This layer has four different locks:
b97bf3fd	79	* - The tipc_port spin_lock. This is protecting each port instance
c4307285 YH	80	* from parallel data access and removal. Since we can not place
c4307285 YH	81	* this lock in the port itself, it has been placed in the
b97bf3fd	82	* corresponding reference table entry, which has the same life
c4307285 YH	83	* cycle as the module. This entry is difficult to access from
	84	* outside the TIPC core, however, so a pointer to the lock has
	85	* been added in the port instance, -to be used for unlocking
b97bf3fd	86	* only.
c4307285 YH	87	* - A read/write lock to protect the reference table itself (teg.c).
c4307285 YH	88	* (Nobody is using read-only access to this, so it can just as
b97bf3fd PL	89	* well be changed to a spin_lock)
b97bf3fd PL	90	* - A spin lock to protect the registry of kernel/driver users (reg.c)
c4307285	91	* - A global spin_lock (tipc_port_lock), which only task is to ensure
b97bf3fd	92	* consistency where more than one port is involved in an operation,
a79ace4b	93	* i.e., when a port is part of a linked list of ports.
b97bf3fd PL	94	* There are two such lists; 'port_list', which is used for management,
b97bf3fd PL	95	* and 'wait_list', which is used to queue ports during congestion.
c4307285	96	*
7216cd94	97	* 4: The name table (name_table.c, name_distr.c, subscription.c)
c4307285 YH	98	* - There is one big read/write-lock (tipc_nametbl_lock) protecting the
c4307285 YH	99	* overall name table structure. Nothing must be added/removed to
b97bf3fd PL	100	* this structure without holding write access to it.
b97bf3fd PL	101	* - There is one local spin_lock per sub_sequence, which can be seen
4323add6	102	* as a sub-domain to the tipc_nametbl_lock domain. It is used only
b97bf3fd PL	103	* for translation operations, and is needed because a translation
b97bf3fd PL	104	* steps the root of the 'publication' linked list between each lookup.
4323add6	105	* This is always used within the scope of a tipc_nametbl_lock(read).
b97bf3fd PL	106	* - A local spin_lock protecting the queue of subscriber events.
b97bf3fd PL	107	*/
b97bf3fd	108
adba75be JM	109	static void tipc_net_finalize(struct net *net, u32 addr);
adba75be JM	110
d50ccc2d	111	int tipc_net_init(struct net net, u8 node_id, u32 addr)
b97bf3fd	112	{
d50ccc2d JM	113	if (tipc_own_id(net)) {
	114	pr_info("Cannot configure node identity twice\n");
	115	return -1;
	116	}
	117	pr_info("Started in network mode\n");
b97bf3fd	118
25b0b9c4	119	if (node_id)
d50ccc2d	120	tipc_set_node_id(net, node_id);
d50ccc2d JM	121	if (addr)
	122	tipc_net_finalize(net, addr);
	123	return 0;
	124	}
40f9f439	125
adba75be	126	static void tipc_net_finalize(struct net *net, u32 addr)
d50ccc2d	127	{
9faa89d4	128	struct tipc_net *tn = tipc_net(net);
50a3499a JM	129	struct tipc_socket_addr sk = {0, addr};
	130	struct tipc_uaddr ua;
	131
	132	tipc_uaddr(&ua, TIPC_SERVICE_RANGE, TIPC_CLUSTER_SCOPE,
	133	TIPC_NODE_STATE, addr, addr);
9faa89d4	134
adba75be JM	135	if (cmpxchg(&tn->node_addr, 0, addr))
	136	return;
	137	tipc_set_node_addr(net, addr);
	138	tipc_named_reinit(net);
	139	tipc_sk_reinit(net);
46cb01ee	140	tipc_mon_reinit_self(net);
50a3499a	141	tipc_nametbl_publish(net, &ua, &sk, addr);
adba75be JM	142	}
adba75be JM	143
d966ddcc	144	void tipc_net_finalize_work(struct work_struct *work)
adba75be	145	{
be07f056	146	struct tipc_net *tn = container_of(work, struct tipc_net, work);
adba75be	147
be07f056	148	tipc_net_finalize(tipc_link_net(tn->bcl), tn->trial_addr);
b97bf3fd PL	149	}
b97bf3fd PL	150
f2f9800d	151	void tipc_net_stop(struct net *net)
b97bf3fd	152	{
9926cb5f	153	if (!tipc_own_id(net))
b97bf3fd	154	return;
46651c59	155
f97e455a	156	rtnl_lock();
f2f9800d	157	tipc_bearer_stop(net);
f2f9800d	158	tipc_node_stop(net);
f97e455a	159	rtnl_unlock();
46651c59	160
2cf8aa19	161	pr_info("Left network mode\n");
b97bf3fd	162	}
fd3cf2ad	163
c93d3baa	164	static int __tipc_nl_add_net(struct net net, struct tipc_nl_msg msg)
fd3cf2ad	165	{
c93d3baa	166	struct tipc_net *tn = net_generic(net, tipc_net_id);
d50ccc2d JM	167	u64 w0 = (u64 )&tn->node_id[0];
d50ccc2d JM	168	u64 w1 = (u64 )&tn->node_id[8];
fd3cf2ad	169	struct nlattr *attrs;
d50ccc2d	170	void *hdr;
fd3cf2ad	171
bfb3e5dd	172	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
fd3cf2ad RA	173	NLM_F_MULTI, TIPC_NL_NET_GET);
	174	if (!hdr)
	175	return -EMSGSIZE;
	176
ae0be8de	177	attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_NET);
fd3cf2ad RA	178	if (!attrs)
	179	goto msg_full;
	180
c93d3baa	181	if (nla_put_u32(msg->skb, TIPC_NLA_NET_ID, tn->net_id))
fd3cf2ad	182	goto attr_msg_full;
d50ccc2d JM	183	if (nla_put_u64_64bit(msg->skb, TIPC_NLA_NET_NODEID, *w0, 0))
	184	goto attr_msg_full;
	185	if (nla_put_u64_64bit(msg->skb, TIPC_NLA_NET_NODEID_W1, *w1, 0))
	186	goto attr_msg_full;
fd3cf2ad RA	187	nla_nest_end(msg->skb, attrs);
	188	genlmsg_end(msg->skb, hdr);
	189
	190	return 0;
	191
	192	attr_msg_full:
	193	nla_nest_cancel(msg->skb, attrs);
	194	msg_full:
	195	genlmsg_cancel(msg->skb, hdr);
	196
	197	return -EMSGSIZE;
	198	}
	199
	200	int tipc_nl_net_dump(struct sk_buff skb, struct netlink_callback cb)
	201	{
c93d3baa	202	struct net *net = sock_net(skb->sk);
fd3cf2ad RA	203	int err;
	204	int done = cb->args[0];
	205	struct tipc_nl_msg msg;
	206
	207	if (done)
	208	return 0;
	209
	210	msg.skb = skb;
	211	msg.portid = NETLINK_CB(cb->skb).portid;
	212	msg.seq = cb->nlh->nlmsg_seq;
	213
c93d3baa	214	err = __tipc_nl_add_net(net, &msg);
fd3cf2ad RA	215	if (err)
	216	goto out;
	217
	218	done = 1;
	219	out:
	220	cb->args[0] = done;
	221
	222	return skb->len;
	223	}
27c21416	224
5631f65d	225	int __tipc_nl_net_set(struct sk_buff skb, struct genl_info info)
27c21416	226	{
27c21416	227	struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
23fd3eac JM	228	struct net *net = sock_net(skb->sk);
23fd3eac JM	229	struct tipc_net *tn = tipc_net(net);
c93d3baa	230	int err;
27c21416 RA	231
	232	if (!info->attrs[TIPC_NLA_NET])
	233	return -EINVAL;
	234
8cb08174 JB	235	err = nla_parse_nested_deprecated(attrs, TIPC_NLA_NET_MAX,
	236	info->attrs[TIPC_NLA_NET],
	237	tipc_nl_net_policy, info->extack);
d50ccc2d	238
27c21416 RA	239	if (err)
	240	return err;
	241
23fd3eac JM	242	/* Can't change net id once TIPC has joined a network */
	243	if (tipc_own_addr(net))
	244	return -EPERM;
	245
27c21416 RA	246	if (attrs[TIPC_NLA_NET_ID]) {
	247	u32 val;
	248
27c21416 RA	249	val = nla_get_u32(attrs[TIPC_NLA_NET_ID]);
	250	if (val < 1 \|\| val > 9999)
	251	return -EINVAL;
	252
c93d3baa	253	tn->net_id = val;
27c21416 RA	254	}
	255
	256	if (attrs[TIPC_NLA_NET_ADDR]) {
	257	u32 addr;
	258
27c21416	259	addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
20263641	260	if (!addr)
27c21416	261	return -EINVAL;
b89afb11	262	tn->legacy_addr_format = true;
d50ccc2d	263	tipc_net_init(net, NULL, addr);
27c21416 RA	264	}
27c21416 RA	265
d50ccc2d JM	266	if (attrs[TIPC_NLA_NET_NODEID]) {
	267	u8 node_id[NODE_ID_LEN];
	268	u64 w0 = (u64 )&node_id[0];
	269	u64 w1 = (u64 )&node_id[8];
	270
c6404122 ED	271	if (!attrs[TIPC_NLA_NET_NODEID_W1])
c6404122 ED	272	return -EINVAL;
d50ccc2d JM	273	*w0 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID]);
	274	*w1 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID_W1]);
	275	tipc_net_init(net, node_id, 0);
	276	}
27c21416 RA	277	return 0;
27c21416 RA	278	}
5631f65d YX	279
	280	int tipc_nl_net_set(struct sk_buff skb, struct genl_info info)
	281	{
	282	int err;
	283
	284	rtnl_lock();
	285	err = __tipc_nl_net_set(skb, info);
	286	rtnl_unlock();
	287
	288	return err;
	289	}
e1b5e598 JR	290
	291	static int __tipc_nl_addr_legacy_get(struct net net, struct tipc_nl_msg msg)
	292	{
	293	struct tipc_net *tn = tipc_net(net);
	294	struct nlattr *attrs;
	295	void *hdr;
	296
	297	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
	298	0, TIPC_NL_ADDR_LEGACY_GET);
	299	if (!hdr)
	300	return -EMSGSIZE;
	301
	302	attrs = nla_nest_start(msg->skb, TIPC_NLA_NET);
	303	if (!attrs)
	304	goto msg_full;
	305
	306	if (tn->legacy_addr_format)
	307	if (nla_put_flag(msg->skb, TIPC_NLA_NET_ADDR_LEGACY))
	308	goto attr_msg_full;
	309
	310	nla_nest_end(msg->skb, attrs);
	311	genlmsg_end(msg->skb, hdr);
	312
	313	return 0;
	314
	315	attr_msg_full:
	316	nla_nest_cancel(msg->skb, attrs);
	317	msg_full:
	318	genlmsg_cancel(msg->skb, hdr);
	319
	320	return -EMSGSIZE;
	321	}
	322
	323	int tipc_nl_net_addr_legacy_get(struct sk_buff skb, struct genl_info info)
	324	{
	325	struct net *net = sock_net(skb->sk);
	326	struct tipc_nl_msg msg;
	327	struct sk_buff *rep;
	328	int err;
	329
	330	rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	331	if (!rep)
	332	return -ENOMEM;
	333
	334	msg.skb = rep;
	335	msg.portid = info->snd_portid;
	336	msg.seq = info->snd_seq;
	337
	338	err = __tipc_nl_addr_legacy_get(net, &msg);
	339	if (err) {
	340	nlmsg_free(msg.skb);
	341	return err;
	342	}
	343
	344	return genlmsg_reply(msg.skb, info);
	345	}