[PATCH iproute2] iptunnel: detect protocol mismatch on tunnel change

[Stephen Hemminger <stephen@networkplumber.org>]

If attempt is made to change an IPv6 tunnel by using IPv4
parameters, a stack overflow would happen and garbage request
would be passed to kernel.

Example:
ip tunnel add gre1 mode ip6gre local 2001:db8::1 remote 2001:db8::2 ttl 255
ip tunnel change gre1 mode gre local 192.168.0.0 remote 192.168.0.1 ttl 255

The second command should fail because it attempting set IPv4 addresses
on a GRE tunnel that is IPv6.

Do best effort detection of this mismatch by giving a bigger buffer to get
tunnel request, and checking that the IP header is IPv4. It is still possible
but unlikely that byte would match in IPv6 tunnel paramater, but good enough
to catch the obvious cases.

Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1032642
Reported-by: Robin <imer@imer.cc>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 ip/iptunnel.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/ip/iptunnel.c b/ip/iptunnel.c
index 02c3670b469d..b6da145913d6 100644
--- a/ip/iptunnel.c
+++ b/ip/iptunnel.c
@@ -17,6 +17,7 @@
 #include <net/if_arp.h>
 #include <linux/ip.h>
 #include <linux/if_tunnel.h>
+#include <linux/ip6_tunnel.h>
 
 #include "rt_names.h"
 #include "utils.h"
@@ -172,11 +173,20 @@ static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
 			if (get_ifname(p->name, *argv))
 				invarg("\"name\" not a valid ifname", *argv);
 			if (cmd == SIOCCHGTUNNEL && count == 0) {
-				struct ip_tunnel_parm old_p = {};
+				union {
+					struct ip_tunnel_parm ip_tnl;
+					struct ip6_tnl_parm2 ip6_tnl;
+				} old_p = {};
 
 				if (tnl_get_ioctl(*argv, &old_p))
 					return -1;
-				*p = old_p;
+
+				if (old_p.ip_tnl.iph.version != 4 ||
+				    old_p.ip_tnl.iph.ihl != 5)
+					invarg("\"name\" is not an ip tunnel",
+					       *argv);
+
+				*p = old_p.ip_tnl;
 			}
 		}
 		count++;
-- 
2.39.2