diff options
author | Pablo Neira Ayuso <pablo@netfilter.org> | 2020-03-18 19:51:20 +0100 |
---|---|---|
committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2020-03-19 10:59:17 +0100 |
commit | 6c84577b0d23d1f3fdafb4d74fd5868e891cc6af (patch) | |
tree | 387096b0c69876937815dd016c9208fc5996c272 /src/cli.c | |
parent | 1fe6089ddd87ee7869d24c0f8849951220cc9b85 (diff) |
evaluate: add range specified flag setting (missing NF_NAT_RANGE_PROTO_SPECIFIED)
Sergey reports:
With nf_tables it is not possible to use port range for masquerading.
Masquerade statement has option "to [:port-port]" which give no effect
to translation behavior. But it must change source port of packet to
one from ":port-port" range.
My network:
+-----------------------------+
| ROUTER |
| |
| Masquerade|
| 10.0.0.1 1.1.1.1 |
| +------+ +------+ |
| | eth1 | | eth2 | |
+-+--^---+-----------+---^--+-+
| |
| |
+----v------+ +------v----+
| | | |
| 10.0.0.2 | | 1.1.1.2 |
| | | |
|PC1 | |PC2 |
+-----------+ +-----------+
For testing i used rule like this:
rule ip nat POSTROUTING oifname eth2 masquerade to :666
Run netcat for 1.1.1.2 667(UDP) and get dump from PC2:
15:22:25.591567 a8:f9:4b:aa:08:44 > a8:f9:4b:ac:e7:8f, ethertype IPv4 (0x0800), length 60: 1.1.1.1.34466 > 1.1.1.2.667: UDP, length 1
Address translation works fine, but source port are not belongs to
specified range.
I see in similar source code (i.e. nft_redir.c, nft_nat.c) that
there is setting NF_NAT_RANGE_PROTO_SPECIFIED flag. After adding this,
repeat test for kernel with this patch, and get dump:
16:16:22.324710 a8:f9:4b:aa:08:44 > a8:f9:4b:ac:e7:8f, ethertype IPv4 (0x0800), length 60: 1.1.1.1.666 > 1.1.1.2.667: UDP, length 1
Now it is works fine.
Reported-by: Sergey Marinkevich <s@marinkevich.ru>
Tested-by: Sergey Marinkevich <s@marinkevich.ru>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'src/cli.c')
0 files changed, 0 insertions, 0 deletions