[NETLINK]: Generic netlink receive queue processor

Introduces netlink_run_queue() to handle the receive queue of
a netlink socket in a generic way. Processes as much as there
was in the queue upon entry and invokes a callback function
for each netlink message found. The callback function may
refuse a message by returning a negative error code but setting
the error pointer to 0 in which case netlink_run_queue() will
return with a qlen != 0.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/net/netlink.h b/include/net/netlink.h
index c99e22db9632..640c26a90cf1 100644
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -183,6 +183,12 @@ struct nla_policy {
         u16             minlen;
 };
 
+extern void             netlink_run_queue(struct sock *sk, unsigned int *qlen,
+                                          int (*cb)(struct sk_buff *,
+                                                    struct nlmsghdr *, int *));
+extern void             netlink_queue_skip(struct nlmsghdr *nlh,
+                                           struct sk_buff *skb);
+
 extern int              nla_validate(struct nlattr *head, int len, int maxtype,
                                      struct nla_policy *policy);
 extern int              nla_parse(struct nlattr *tb[], int maxtype,