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Commit 3e4b6ab5 authored by Richard Alpe's avatar Richard Alpe Committed by David S. Miller
Browse files

tipc: add node get/dump to new netlink api 



Add TIPC_NL_NODE_GET to the new tipc netlink API.

This command can dump the address and node status of all nodes in the
tipc cluster.

Netlink logical layout of returned node/address data:
-> node
    -> address
    -> up flag

Signed-off-by: default avatarRichard Alpe <richard.alpe@ericsson.com>
Reviewed-by: default avatarErik Hugne <erik.hugne@ericsson.com>
Reviewed-by: default avatarJon Maloy <jon.maloy@ericsson.com>
Acked-by: default avatarYing Xue <ying.xue@windriver.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1e55417d

include/uapi/linux/tipc_netlink.h

+12 −0
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ enum { 
	TIPC_NL_LINK_RESET_STATS,

	TIPC_NL_MEDIA_GET,

	TIPC_NL_MEDIA_SET,

	TIPC_NL_NODE_GET,



	__TIPC_NL_CMD_MAX,

	TIPC_NL_CMD_MAX = __TIPC_NL_CMD_MAX - 1
@@ -65,6 +66,7 @@ enum { 
	TIPC_NLA_PUBL,			/* nest */

	TIPC_NLA_LINK,			/* nest */

	TIPC_NLA_MEDIA,			/* nest */

	TIPC_NLA_NODE,			/* nest */



	__TIPC_NLA_MAX,

	TIPC_NLA_MAX = __TIPC_NLA_MAX - 1
@@ -121,6 +123,16 @@ enum { 
	TIPC_NLA_MEDIA_MAX = __TIPC_NLA_MEDIA_MAX - 1

};



/* Node info */

enum {

	TIPC_NLA_NODE_UNSPEC,

	TIPC_NLA_NODE_ADDR,		/* u32 */

	TIPC_NLA_NODE_UP,		/* flag */



	__TIPC_NLA_NODE_MAX,

	TIPC_NLA_NODE_MAX = __TIPC_NLA_NODE_MAX - 1

};



/* Publication info */

enum {

	TIPC_NLA_PUBL_UNSPEC,

net/tipc/netlink.c

+7 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ 
#include "socket.h"

#include "bearer.h"

#include "link.h"

#include "node.h"

#include <net/genetlink.h>



static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
@@ -78,6 +79,7 @@ static const struct nla_policy tipc_nl_policy[TIPC_NLA_MAX + 1] = { 
	[TIPC_NLA_PUBL]		= { .type = NLA_NESTED, },

	[TIPC_NLA_LINK]		= { .type = NLA_NESTED, },

	[TIPC_NLA_MEDIA]	= { .type = NLA_NESTED, },

	[TIPC_NLA_NODE]		= { .type = NLA_NESTED, }

};



/* Legacy ASCII API */
@@ -166,6 +168,11 @@ static const struct genl_ops tipc_genl_v2_ops[] = { 
		.cmd	= TIPC_NL_MEDIA_SET,

		.doit	= tipc_nl_media_set,

		.policy = tipc_nl_policy,

	},

	{

		.cmd	= TIPC_NL_NODE_GET,

		.dumpit	= tipc_nl_node_dump,

		.policy = tipc_nl_policy,

	}

};

net/tipc/node.c

+96 −0
Original line number Diff line number Diff line
@@ -58,6 +58,12 @@ struct tipc_sock_conn { 
	struct list_head list;

};



static const struct nla_policy tipc_nl_node_policy[TIPC_NLA_NODE_MAX + 1] = {

	[TIPC_NLA_NODE_UNSPEC]		= { .type = NLA_UNSPEC },

	[TIPC_NLA_NODE_ADDR]		= { .type = NLA_U32 },

	[TIPC_NLA_NODE_UP]		= { .type = NLA_FLAG }

};



/*

 * A trivial power-of-two bitmask technique is used for speed, since this

 * operation is done for every incoming TIPC packet. The number of hash table
@@ -601,3 +607,93 @@ void tipc_node_unlock(struct tipc_node *node) 
		tipc_nametbl_withdraw(TIPC_LINK_STATE, addr,

				      link_id, addr);

}



/* Caller should hold node lock for the passed node */

int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)

{

	void *hdr;

	struct nlattr *attrs;



	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_v2_family,

			  NLM_F_MULTI, TIPC_NL_NODE_GET);

	if (!hdr)

		return -EMSGSIZE;



	attrs = nla_nest_start(msg->skb, TIPC_NLA_NODE);

	if (!attrs)

		goto msg_full;



	if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))

		goto attr_msg_full;

	if (tipc_node_is_up(node))

		if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))

			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_node_dump(struct sk_buff *skb, struct netlink_callback *cb)

{

	int err;

	int done = cb->args[0];

	int last_addr = cb->args[1];

	struct tipc_node *node;

	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;



	rcu_read_lock();



	if (last_addr && !tipc_node_find(last_addr)) {

		rcu_read_unlock();

		/* 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 NLMSG_DONE message having the NLM_F_DUMP_INTR flag set if

		 * the node state changed while we released the lock.

		 */

		cb->prev_seq = 1;

		return -EPIPE;

	}



	list_for_each_entry_rcu(node, &tipc_node_list, list) {

		if (last_addr) {

			if (node->addr == last_addr)

				last_addr = 0;

			else

				continue;

		}



		tipc_node_lock(node);

		err = __tipc_nl_add_node(&msg, node);

		if (err) {

			last_addr = node->addr;

			tipc_node_unlock(node);

			goto out;

		}



		tipc_node_unlock(node);

	}

	done = 1;

out:

	cb->args[0] = done;

	cb->args[1] = last_addr;

	rcu_read_unlock();



	return skb->len;

}

net/tipc/node.h

+3 −1
Original line number Diff line number Diff line 
/*

 * net/tipc/node.h: Include file for TIPC node management routines

 *

 * Copyright (c) 2000-2006, Ericsson AB

 * Copyright (c) 2000-2006, 2014, Ericsson AB

 * Copyright (c) 2005, 2010-2014, Wind River Systems

 * All rights reserved.

 *
@@ -145,6 +145,8 @@ void tipc_node_unlock(struct tipc_node *node); 
int tipc_node_add_conn(u32 dnode, u32 port, u32 peer_port);

void tipc_node_remove_conn(u32 dnode, u32 port);



int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb);



static inline void tipc_node_lock(struct tipc_node *node)

{

	spin_lock_bh(&node->lock);