Commit 35b9dd76 authored by Richard Alpe's avatar Richard Alpe Committed by David S. Miller
Browse files

tipc: add bearer get/dump to new netlink api 



Add TIPC_NL_BEARER_GET command to the new tipc netlink API.

This command supports dumping all data about all bearers or getting
all information about a specific bearer.

The information about a bearer includes name, link priorities and
domain.

Netlink logical layout of bearer get message:
-> bearer
    -> name

Netlink logical layout of returned bearer information:
-> bearer
    -> name
    -> link properties
        -> priority
        -> tolerance
        -> window
    -> domain

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 0655f6a8

include/uapi/linux/tipc_netlink.h

+1 −0
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ enum { 
	TIPC_NL_LEGACY,

	TIPC_NL_BEARER_DISABLE,

	TIPC_NL_BEARER_ENABLE,

	TIPC_NL_BEARER_GET,



	__TIPC_NL_CMD_MAX,

	TIPC_NL_CMD_MAX = __TIPC_NL_CMD_MAX - 1

net/tipc/bearer.c

+125 −0
Original line number Diff line number Diff line
@@ -640,6 +640,131 @@ void tipc_bearer_stop(void) 
	}

}



/* Caller should hold rtnl_lock to protect the bearer */

int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, struct tipc_bearer *bearer)

{

	void *hdr;

	struct nlattr *attrs;

	struct nlattr *prop;



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

			  NLM_F_MULTI, TIPC_NL_BEARER_GET);

	if (!hdr)

		return -EMSGSIZE;



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

	if (!attrs)

		goto msg_full;



	if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))

		goto attr_msg_full;



	prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);

	if (!prop)

		goto prop_msg_full;

	if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))

		goto prop_msg_full;

	if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))

		goto prop_msg_full;

	if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))

		goto prop_msg_full;



	nla_nest_end(msg->skb, prop);

	nla_nest_end(msg->skb, attrs);

	genlmsg_end(msg->skb, hdr);



	return 0;



prop_msg_full:

	nla_nest_cancel(msg->skb, prop);

attr_msg_full:

	nla_nest_cancel(msg->skb, attrs);

msg_full:

	genlmsg_cancel(msg->skb, hdr);



	return -EMSGSIZE;

}



int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)

{

	int err;

	int i = cb->args[0];

	struct tipc_bearer *bearer;

	struct tipc_nl_msg msg;



	if (i == MAX_BEARERS)

		return 0;



	msg.skb = skb;

	msg.portid = NETLINK_CB(cb->skb).portid;

	msg.seq = cb->nlh->nlmsg_seq;



	rtnl_lock();

	for (i = 0; i < MAX_BEARERS; i++) {

		bearer = rtnl_dereference(bearer_list[i]);

		if (!bearer)

			continue;



		err = __tipc_nl_add_bearer(&msg, bearer);

		if (err)

			break;

	}

	rtnl_unlock();



	cb->args[0] = i;

	return skb->len;

}



int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)

{

	int err;

	char *name;

	struct sk_buff *rep;

	struct tipc_bearer *bearer;

	struct tipc_nl_msg msg;

	struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];



	if (!info->attrs[TIPC_NLA_BEARER])

		return -EINVAL;



	err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,

			       info->attrs[TIPC_NLA_BEARER],

			       tipc_nl_bearer_policy);

	if (err)

		return err;



	if (!attrs[TIPC_NLA_BEARER_NAME])

		return -EINVAL;

	name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);



	rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);

	if (!rep)

		return -ENOMEM;



	msg.skb = rep;

	msg.portid = info->snd_portid;

	msg.seq = info->snd_seq;



	rtnl_lock();

	bearer = tipc_bearer_find(name);

	if (!bearer) {

		err = -EINVAL;

		goto err_out;

	}



	err = __tipc_nl_add_bearer(&msg, bearer);

	if (err)

		goto err_out;

	rtnl_unlock();



	return genlmsg_reply(rep, info);

err_out:

	rtnl_unlock();

	nlmsg_free(rep);



	return err;

}



int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)

{

	int err;

net/tipc/bearer.h

+2 −0
Original line number Diff line number Diff line
@@ -180,6 +180,8 @@ extern struct tipc_media ib_media_info; 


int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info);

int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info);

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

int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info);



int tipc_media_set_priority(const char *name, u32 new_value);

int tipc_media_set_window(const char *name, u32 new_value);

net/tipc/netlink.c

+6 −0
Original line number Diff line number Diff line
@@ -112,6 +112,12 @@ static const struct genl_ops tipc_genl_v2_ops[] = { 
		.cmd	= TIPC_NL_BEARER_ENABLE,

		.doit	= tipc_nl_bearer_enable,

		.policy = tipc_nl_policy,

	},

	{

		.cmd	= TIPC_NL_BEARER_GET,

		.doit	= tipc_nl_bearer_get,

		.dumpit	= tipc_nl_bearer_dump,

		.policy = tipc_nl_policy,

	}

};

net/tipc/netlink.h

+6 −0
Original line number Diff line number Diff line
@@ -38,4 +38,10 @@ 


extern struct genl_family tipc_genl_v2_family;



struct tipc_nl_msg {

	struct sk_buff *skb;

	u32 portid;

	u32 seq;

};



#endif

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