ieee802154: add two nl802154 helpers

Add two nl802154 helpers: one for starting a reply message, one for sending.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>

2 files changed, 38 insertions, 0 deletions

diff --git a/net/ieee802154/ieee802154.h b/net/ieee802154/ieee802154.h
index 0790eb06d682..aadec428e6ec 100644
--- a/net/ieee802154/ieee802154.h
+++ b/net/ieee802154/ieee802154.h
@@ -38,8 +38,13 @@ void __exit ieee802154_nl_exit(void);
                 .dumpit = _dump,                        \
         }
 
+struct genl_info;
+
 struct sk_buff *ieee802154_nl_create(int flags, u8 req);
 int ieee802154_nl_mcast(struct sk_buff *msg, unsigned int group);
+struct sk_buff *ieee802154_nl_new_reply(struct genl_info *info,
+                int flags, u8 req);
+int ieee802154_nl_reply(struct sk_buff *msg, struct genl_info *info);
 
 extern struct genl_family nl802154_family;
 int nl802154_mac_register(void);
diff --git a/net/ieee802154/netlink.c b/net/ieee802154/netlink.c
index 8a221737f75c..33137b99e471 100644
--- a/net/ieee802154/netlink.c
+++ b/net/ieee802154/netlink.c
@@ -75,6 +75,39 @@ out:
         return -ENOBUFS;
 }
 
+struct sk_buff *ieee802154_nl_new_reply(struct genl_info *info,
+                int flags, u8 req)
+{
+        void *hdr;
+        struct sk_buff *msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
+
+        if (!msg)
+                return NULL;
+
+        hdr = genlmsg_put_reply(msg, info,
+                        &nl802154_family, flags, req);
+        if (!hdr) {
+                nlmsg_free(msg);
+                return NULL;
+        }
+
+        return msg;
+}
+
+int ieee802154_nl_reply(struct sk_buff *msg, struct genl_info *info)
+{
+        /* XXX: nlh is right at the start of msg */
+        void *hdr = genlmsg_data(NLMSG_DATA(msg->data));
+
+        if (genlmsg_end(msg, hdr) < 0)
+                goto out;
+
+        return genlmsg_reply(msg, info);
+out:
+        nlmsg_free(msg);
+        return -ENOBUFS;
+}
+
 int __init ieee802154_nl_init(void)
 {
         int rc;