From: David Howells <[EMAIL PROTECTED]>
Date: Fri, 13 Apr 2007 19:08:31 +0100
> AF_NETLINK sockets, however, do not do (3). See this bit in
> netlink_recvmsg():
>
> copied = skb->len;
> if (len < copied) {
> msg->msg_flags |= MSG_TRUNC;
> copied = len;
> }
>
> Or is this only true if the caller of recvmsg() passes MSG_TRUNC in?
See this fix in my net-2.6.22 tree:
commit ad495d7b6cfcd1bc2eaf06c42699be0bb5d84234
Author: David S. Miller <[EMAIL PROTECTED]>
Date: Tue Mar 6 17:02:35 2007 -0800
[NETLINK]: Mirror UDP MSG_TRUNC semantics.
If the user passes MSG_TRUNC in via msg_flags, return
the full packet size not the truncated size.
Idea from Herbert Xu and Thomas Graf.
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index e73d8f5..b31a732 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1242,6 +1242,9 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct
socket *sock,
scm_recv(sock, msg, siocb->scm, flags);
+ if (flags & MSG_TRUNC)
+ copied = skb->len;
+
out:
netlink_rcv_wake(sk);
return err ? : copied;
-
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