netfilter: x_tables: check standard verdicts in core

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Userspace must provide a valid verdict to the standard target.

The verdict can be either a jump (signed int > 0), or a return code.

Allowed return codes are either RETURN (pop from stack), NF_ACCEPT, DROP
and QUEUE (latter is allowed for legacy reasons).

Jump offsets (verdict > 0) are checked in more detail later on when
loop-detection is performed.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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This commit is contained in:

Florian Westphal 2018-02-27 19:42:27 +01:00 • committed by Pablo Neira Ayuso

parent f31e5f1a89

commit 07a9da51b4

4 changed files with 43 additions and 21 deletions

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5

net/ipv4/netfilter/arp_tables.c

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5

net/ipv4/netfilter/ip_tables.c

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5

net/ipv6/netfilter/ip6_tables.c

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49

net/netfilter/x_tables.c

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