linux-kernel - [PATCH 13/16] commit ad495d7b6cfcd1bc2eaf06c42699be0bb5d84234 [try #4]

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Message-ID: <20070425155003.26581.31916.stgit@warthog.cambridge.redhat.com>
Date:	Wed, 25 Apr 2007 16:50:04 +0100
From:	David Howells <dhowells@...hat.com>
To:	torvalds@...l.org, akpm@...l.org
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	netdev@...r.kernel.org, dhowells@...hat.com
Subject: [PATCH 13/16] commit ad495d7b6cfcd1bc2eaf06c42699be0bb5d84234 [try #4]

[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 <davem@...emloft.net>
---

 net/netlink/af_netlink.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index c48b0f4..5890210 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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