From mboxrd@z Thu Jan 1 00:00:00 1970 From: Cong Wang Subject: [Patch net-next v3] gre: fix a regression in ioctl Date: Sat, 29 Jun 2013 12:02:59 +0800 Message-ID: <1372478579-6548-1-git-send-email-amwang@redhat.com> References: Cc: Pravin B Shelar , "David S. Miller" , Cong Wang To: netdev@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:23947 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750757Ab3F2EDL (ORCPT ); Sat, 29 Jun 2013 00:03:11 -0400 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: From: Cong Wang When testing GRE tunnel, I got: # ip tunnel show get tunnel gre0 failed: Invalid argument get tunnel gre1 failed: Invalid argument This is a regression introduced by commit c54419321455631079c7d ("GRE: Refactor GRE tunneling code.") because previously we only check the parameters for SIOCADDTUNNEL and SIOCCHGTUNNEL, after that commit, the check is moved for all commands. So, just check for SIOCADDTUNNEL and SIOCCHGTUNNEL. After this patch I got: # ip tunnel show gre0: gre/ip remote any local any ttl inherit nopmtudisc gre1: gre/ip remote 192.168.122.101 local 192.168.122.45 ttl inherit Cc: Pravin B Shelar Cc: "David S. Miller" Signed-off-by: Cong Wang --- v2: check TUNNEL_* flags v3: the check should be kept in gre module diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index c326e86..1f6eab6 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -314,10 +314,11 @@ static int ipgre_tunnel_ioctl(struct net_device *dev, if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) return -EFAULT; - if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || - p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || - ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) { - return -EINVAL; + if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { + if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || + p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || + ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) + return -EINVAL; } p.i_flags = gre_flags_to_tnl_flags(p.i_flags); p.o_flags = gre_flags_to_tnl_flags(p.o_flags);