diff options
| author | Toshi Kikuchi <toshik@google.com> | 2021-04-09 21:09:47 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2021-04-09 21:11:26 -0700 |
| commit | d1edabdca016b9d80295855a3ce6d2816486d65c (patch) | |
| tree | 9e9827ed0ff58ada2beab7605366d5c881404861 /pkg/abi/linux | |
| parent | ea7faa50579d3d76c6cbb1f7ffba4e16eebf1885 (diff) | |
iptables: support postrouting hook and SNAT target
The current SNAT implementation has several limitations:
- SNAT source port has to be specified. It is not optional.
- SNAT source port range is not supported.
- SNAT for UDP is a one-way translation. No response packets
are handled (because conntrack doesn't support UDP currently).
- SNAT and REDIRECT can't work on the same connection.
Fixes #5489
PiperOrigin-RevId: 367750325
Diffstat (limited to 'pkg/abi/linux')
| -rw-r--r-- | pkg/abi/linux/netfilter.go | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/pkg/abi/linux/netfilter.go b/pkg/abi/linux/netfilter.go index 378f1baf3..775bbc759 100644 --- a/pkg/abi/linux/netfilter.go +++ b/pkg/abi/linux/netfilter.go @@ -375,6 +375,17 @@ type XTRedirectTarget struct { // SizeOfXTRedirectTarget is the size of an XTRedirectTarget. const SizeOfXTRedirectTarget = 56 +// XTSNATTarget triggers Source NAT when reached. +// Adding 4 bytes of padding to make the struct 8 byte aligned. +type XTSNATTarget struct { + Target XTEntryTarget + NfRange NfNATIPV4MultiRangeCompat + _ [4]byte +} + +// SizeOfXTSNATTarget is the size of an XTSNATTarget. +const SizeOfXTSNATTarget = 56 + // IPTGetinfo is the argument for the IPT_SO_GET_INFO sockopt. It corresponds // to struct ipt_getinfo in include/uapi/linux/netfilter_ipv4/ip_tables.h. // |