iptables: backport "nft: track each register individually" from 1.9

From the upstream repo:

Instead of assuming only one register is used, track all 16 regs
individually.

This avoids need for the 'PREV_PAYLOAD' hack and also avoids the need to
clear out old flags:

When we see that register 'x' will be written to, that register state is
reset automatically.

Existing dissector decodes
ip saddr 1.2.3.4 meta l4proto tcp
... as
-s 6.0.0.0 -p tcp

iptables-nft -s 1.2.3.4 -p tcp is decoded correctly because the expressions
are ordered like:

meta l4proto tcp ip saddr 1.2.3.4
                                                                                                                                                                                                                   |
... and 'meta l4proto' did clear the PAYLOAD flag.

The simpler fix is:
		ctx->flags &= ~NFT_XT_CTX_PAYLOAD;

in nft_parse_cmp(), but that breaks dissection of '1-42', because
the second compare ('cmp lte 42') will not find the
payload expression anymore.

This commit fixes openwrt#11169 and openwrt/packages#22727, and potentially anyone that uses iptables-nft legacy support.

Signed-off-by: Rodrigo B. de Sousa Martins <rodrigo.sousa.577@gmail.com>
Link: openwrt#16504
[Added patch header]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit 44b1993)

package/network/utils/iptables/Makefile

@@ -10,7 +10,7 @@ include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=iptables
 PKG_VERSION:=1.8.8
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE_URL:=https://netfilter.org/projects/iptables/files
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2