netdev - [PATCH] sendfile() and UDP socket

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Date:	Wed, 10 Sep 2008 14:39:55 +0200
From:	"Johann Baudy" <johaahn@...il.com>
To:	netdev@...r.kernel.org
Cc:	"Evgeniy Polyakov" <johnpol@....mipt.ru>
Subject: [PATCH] sendfile() and UDP socket

Hi All,

Sendfile() over UDP socket are currently limited to ~ 64KBytes file
(max cork.length).
Indeed, if you run sendfile() with a file size > 64KBytes over UDP
socket, system call will stop and return ~64KBytes without sending
anything on the network.
This patch is pushing ongoing frames when frames buffer is full, to
prevent overflow.

Signed-off-by: Johann Baudy <johann.baudy@...il.com>

 net/ipv4/udp.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 56fcda3..d019e13 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -743,7 +743,22 @@ int udp_sendpage(struct sock *sk, struct page
*page, int offset,
                 size_t size, int flags)
 {
        struct udp_sock *up = udp_sk(sk);
+       struct inet_sock *inet = inet_sk(sk);
        int ret;
+       int fragheaderlen;
+       struct ip_options *opt = NULL;
+
+       lock_sock(sk);
+       if (inet->cork.flags & IPCORK_OPT)
+               opt = inet->cork.opt;
+       fragheaderlen = sizeof(struct iphdr) + (opt ? opt->optlen : 0);
+
+       if (inet->cork.length + size >= 0xFFFF - fragheaderlen) {
+               ret = udp_push_pending_frames(sk);
+               if (ret)
+                       goto out;
+       }
+       release_sock(sk);

        if (!up->pending) {
                struct msghdr msg = {   .msg_flags = flags|MSG_MORE };
--
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