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Commit efb766af authored by Andrew Lunn's avatar Andrew Lunn Committed by Simon Wunderlich
Browse files

batman-adv: add B.A.T.M.A.N. IV bat_gw_dump implementations 



Dump the list of gateways via the netlink socket.

Signed-off-by: default avatarAndrew Lunn <andrew@lunn.ch>
[sven.eckelmann@open-mesh.com: integrate in batadv_algo_ops]
Signed-off-by: default avatarSven Eckelmann <sven.eckelmann@open-mesh.com>
Signed-off-by: default avatarSimon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: default avatarMarek Lindner <mareklindner@neomailbox.ch>
parent d7129daf

net/batman-adv/bat_iv_ogm.c

+105 −0
Original line number Diff line number Diff line
@@ -2681,6 +2681,110 @@ static void batadv_iv_gw_print(struct batadv_priv *bat_priv, 
		seq_puts(seq, "No gateways in range ...\n");

}



/**

 * batadv_iv_gw_dump_entry - Dump a gateway into a message

 * @msg: Netlink message to dump into

 * @portid: Port making netlink request

 * @seq: Sequence number of netlink message

 * @bat_priv: The bat priv with all the soft interface information

 * @gw_node: Gateway to be dumped

 *

 * Return: Error code, or 0 on success

 */

static int batadv_iv_gw_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,

				   struct batadv_priv *bat_priv,

				   struct batadv_gw_node *gw_node)

{

	struct batadv_neigh_ifinfo *router_ifinfo = NULL;

	struct batadv_neigh_node *router;

	struct batadv_gw_node *curr_gw;

	int ret = -EINVAL;

	void *hdr;



	router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT);

	if (!router)

		goto out;



	router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);

	if (!router_ifinfo)

		goto out;



	curr_gw = batadv_gw_get_selected_gw_node(bat_priv);



	hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,

			  NLM_F_MULTI, BATADV_CMD_GET_GATEWAYS);

	if (!hdr) {

		ret = -ENOBUFS;

		goto out;

	}



	ret = -EMSGSIZE;



	if (curr_gw == gw_node)

		if (nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) {

			genlmsg_cancel(msg, hdr);

			goto out;

		}



	if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,

		    gw_node->orig_node->orig) ||

	    nla_put_u8(msg, BATADV_ATTR_TQ, router_ifinfo->bat_iv.tq_avg) ||

	    nla_put(msg, BATADV_ATTR_ROUTER, ETH_ALEN,

		    router->addr) ||

	    nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,

			   router->if_incoming->net_dev->name) ||

	    nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_DOWN,

			gw_node->bandwidth_down) ||

	    nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_UP,

			gw_node->bandwidth_up)) {

		genlmsg_cancel(msg, hdr);

		goto out;

	}



	genlmsg_end(msg, hdr);

	ret = 0;



out:

	if (router_ifinfo)

		batadv_neigh_ifinfo_put(router_ifinfo);

	if (router)

		batadv_neigh_node_put(router);

	return ret;

}



/**

 * batadv_iv_gw_dump - Dump gateways into a message

 * @msg: Netlink message to dump into

 * @cb: Control block containing additional options

 * @bat_priv: The bat priv with all the soft interface information

 */

static void batadv_iv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb,

			      struct batadv_priv *bat_priv)

{

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

	struct batadv_gw_node *gw_node;

	int idx_skip = cb->args[0];

	int idx = 0;



	rcu_read_lock();

	hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {

		if (idx++ < idx_skip)

			continue;



		if (batadv_iv_gw_dump_entry(msg, portid, cb->nlh->nlmsg_seq,

					    bat_priv, gw_node)) {

			idx_skip = idx - 1;

			goto unlock;

		}

	}



	idx_skip = idx;

unlock:

	rcu_read_unlock();



	cb->args[0] = idx_skip;

}



static struct batadv_algo_ops batadv_batman_iv __read_mostly = {

	.name = "BATMAN_IV",

	.iface = {
@@ -2707,6 +2811,7 @@ static struct batadv_algo_ops batadv_batman_iv __read_mostly = { 
		.get_best_gw_node = batadv_iv_gw_get_best_gw_node,

		.is_eligible = batadv_iv_gw_is_eligible,

		.print = batadv_iv_gw_print,

		.dump = batadv_iv_gw_dump,

	},

};