From: Sunny73Cr <Sunny73Cr@protonmail.com>
To: "netfilter-devel@vger.kernel.org" <netfilter-devel@vger.kernel.org>
Subject: payload expressions, netlink debug output
Date: Fri, 14 Feb 2025 04:17:17 +0000 [thread overview]
Message-ID: <iUf9BfY67Kl_ry63O6gOxJ2YHKmO-OFslzCRzfWVOxIe15iVlUV2G07XiT0qu5bsF9vvyrDRT4TQODjt2ksTfpiv1-nYlhgG5ryzcidhdug=@protonmail.com> (raw)
Hi,
It appears that the incorrect register is accepted when data is modified.
Running Debian 12.9.
/etc/nftables.conf:
#!/usr/sbin/nft -f
flush ruleset
table inet filter {
chain output {
type filter hook output priority filter;
@ih,0,128 set 0 \
accept;
}
}
output (viewable with /usr/sbin/nft -d all -f /etc/nftables.conf):
[ immediate reg 1 0x00000000 0x00000000 0x00000000 0x00000000 ]
[ payload write reg 1 => 16b @ inner header + 0 csum_type 0 csum_off 0 csum_flags 0x1 ]
[ immediate reg 0 accept ]
If reg 1 was modified, I believe it should be reg 1 that is accepted.
Please, may somebody with more experience check my assumption?
sunny
next reply other threads:[~2025-02-14 4:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-14 4:17 Sunny73Cr [this message]
2025-02-14 7:20 ` payload expressions, netlink debug output Florian Westphal
2025-02-15 4:04 ` Sunny73Cr
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