path: root/extensions/libipt_DNAT.c
diff options
authorPhil Oester <>2005-09-19 15:00:33 +0000
committerHarald Welte <>2005-09-19 15:00:33 +0000
commit8cf65913bb6353bf0e92eab0669d1c4c53b43623 (patch)
treeb77c8d881be4ec2a0e701e5bbd78ac6c6f0df111 /extensions/libipt_DNAT.c
parent3643aca580531eb795832feb8a83cca57f57dc0e (diff)
Kernels higher than 2.6.10 don't support multiple --to arguments in
DNAT and SNAT targets. At present, the error is somewhat vague: # iptables -t nat -A foo -j SNAT --to --to iptables: Invalid argument But if we want current iptables to work with kernels <= 2.6.10, we cannot simply disallow this in all cases. So the below patch adds kernel version checking to iptables, and utilizes it in [DS]NAT. Now, users will see a more informative error: # iptables -t nat -A foo -j SNAT --to --to iptables v1.3.3: Multiple --to-source not supported This generic infrastructure (shamelessly lifted from procps btw) may come in handy in the future for other changes. This fixes bugzilla #367. (Phil Oester)
Diffstat (limited to 'extensions/libipt_DNAT.c')
1 files changed, 7 insertions, 0 deletions
diff --git a/extensions/libipt_DNAT.c b/extensions/libipt_DNAT.c
index 3b0d146c..bdc15eb8 100644
--- a/extensions/libipt_DNAT.c
+++ b/extensions/libipt_DNAT.c
@@ -155,6 +155,13 @@ parse(int c, char **argv, int invert, unsigned int *flags,
"Unexpected `!' after --to-destination");
+ if (*flags) {
+ if (!kernel_version)
+ get_kernel_version();
+ if (kernel_version > LINUX_VERSION(2, 6, 10))
+ "Multiple --to-destination not supported");
+ }
*target = parse_to(optarg, portok, info);
*flags = 1;
return 1;