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authorMatthias Schiffer <mschiffer@universe-factory.net>2016-07-03 13:31:35 +0200
committerSimon Wunderlich <sw@simonwunderlich.de>2016-08-09 07:54:36 +0200
commit07a3061e0832fe22932e0fa977581e45b9c42431 (patch)
tree7ba704ec4c864bc69589ed0e3950aab259b15207 /net/batman-adv/bat_algo.c
parent94969208c8c7f3dd06c0e5e61155077b573d5d5f (diff)
batman-adv: netlink: add routing_algo query
BATADV_CMD_GET_ROUTING_ALGOS is used to get the list of supported routing algorithms. Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net> Signed-off-by: Andrew Lunn <andrew@lunn.ch> [sven.eckelmann@open-mesh.com: Reduce the number of changes to BATADV_CMD_GET_ROUTING_ALGOS, fix includes] Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Diffstat (limited to 'net/batman-adv/bat_algo.c')
-rw-r--r--net/batman-adv/bat_algo.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/net/batman-adv/bat_algo.c b/net/batman-adv/bat_algo.c
index 81dbbf569bd4..f2cc50d354d9 100644
--- a/net/batman-adv/bat_algo.c
+++ b/net/batman-adv/bat_algo.c
@@ -20,12 +20,18 @@
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/moduleparam.h>
+#include <linux/netlink.h>
#include <linux/printk.h>
#include <linux/seq_file.h>
+#include <linux/skbuff.h>
#include <linux/stddef.h>
#include <linux/string.h>
+#include <net/genetlink.h>
+#include <net/netlink.h>
+#include <uapi/linux/batman_adv.h>
#include "bat_algo.h"
+#include "netlink.h"
char batadv_routing_algo[20] = "BATMAN_IV";
static struct hlist_head batadv_algo_list;
@@ -138,3 +144,65 @@ static struct kparam_string batadv_param_string_ra = {
module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
0644);
+
+/**
+ * batadv_algo_dump_entry - fill in information about one supported routing
+ * algorithm
+ * @msg: netlink message to be sent back
+ * @portid: Port to reply to
+ * @seq: Sequence number of message
+ * @bat_algo_ops: Algorithm to be dumped
+ *
+ * Return: Error number, or 0 on success
+ */
+static int batadv_algo_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
+ struct batadv_algo_ops *bat_algo_ops)
+{
+ void *hdr;
+
+ hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
+ NLM_F_MULTI, BATADV_CMD_GET_ROUTING_ALGOS);
+ if (!hdr)
+ return -EMSGSIZE;
+
+ if (nla_put_string(msg, BATADV_ATTR_ALGO_NAME, bat_algo_ops->name))
+ goto nla_put_failure;
+
+ genlmsg_end(msg, hdr);
+ return 0;
+
+ nla_put_failure:
+ genlmsg_cancel(msg, hdr);
+ return -EMSGSIZE;
+}
+
+/**
+ * batadv_algo_dump - fill in information about supported routing
+ * algorithms
+ * @msg: netlink message to be sent back
+ * @cb: Parameters to the netlink request
+ *
+ * Return: Length of reply message.
+ */
+int batadv_algo_dump(struct sk_buff *msg, struct netlink_callback *cb)
+{
+ int portid = NETLINK_CB(cb->skb).portid;
+ struct batadv_algo_ops *bat_algo_ops;
+ int skip = cb->args[0];
+ int i = 0;
+
+ hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) {
+ if (i++ < skip)
+ continue;
+
+ if (batadv_algo_dump_entry(msg, portid, cb->nlh->nlmsg_seq,
+ bat_algo_ops)) {
+ i--;
+ break;
+ }
+ }
+
+ cb->args[0] = i;
+
+ return msg->len;
+}