[NETLINK]: Do precise netlink message allocations where possible

Account for the netlink message header size directly in nlmsg_new()
instead of relying on the caller calculate it correctly.

Replaces error handling of message construction functions when
constructing notifications with bug traps since a failure implies
a bug in calculating the size of the skb.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/net/fib_rules.h b/include/net/fib_rules.h
index e4ba781d289f..bc3c26494c3d 100644
--- a/include/net/fib_rules.h
+++ b/include/net/fib_rules.h
@@ -52,6 +52,7 @@ struct fib_rules_ops
                                         struct nlmsghdr *,
                                         struct fib_rule_hdr *);
         u32                     (*default_pref)(void);
+        size_t                  (*nlmsg_payload)(struct fib_rule *);
 
         int                     nlgroup;
         struct nla_policy       *policy;