From e36d3ff91130002c7c2d1d6a55556991da1daecc Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Sat, 19 Oct 2013 12:29:15 +0200 Subject: [PATCH] udp6: respect IPV6_DONTFRAG sockopt in case there are pending frames if up->pending != 0 dontfrag is left with default value -1. That causes that application that do: sendto len>mtu flag MSG_MORE sendto len>mtu flag 0 will receive EMSGSIZE errno as the result of the second sendto. This patch fixes it by respecting IPV6_DONTFRAG socket option. introduced by: commit 4b340ae20d0e2366792abe70f46629e576adaf5e "IPv6: Complete IPV6_DONTFRAG support" Signed-off-by: Jiri Pirko Acked-by: Hannes Frederic Sowa Signed-off-by: David S. Miller --- net/ipv6/udp.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 72b7eaaf3ca0..18786098fd41 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -1225,9 +1225,6 @@ do_udp_sendmsg: if (tclass < 0) tclass = np->tclass; - if (dontfrag < 0) - dontfrag = np->dontfrag; - if (msg->msg_flags&MSG_CONFIRM) goto do_confirm; back_from_confirm: @@ -1246,6 +1243,8 @@ back_from_confirm: up->pending = AF_INET6; do_append_data: + if (dontfrag < 0) + dontfrag = np->dontfrag; up->len += ulen; getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, -- 2.20.1