From: Cong Wang Date: Sat, 29 Jun 2013 04:02:59 +0000 (+0800) Subject: gre: fix a regression in ioctl X-Git-Tag: v3.11-rc1~64^2~59 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=6c734fb8592f6768170e48e7102cb2f0a1bb9759;p=linux.git gre: fix a regression in ioctl 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 Signed-off-by: David S. Miller --- diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index c326e869993a..1f6eab66f7ce 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);