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iptables-restore allows to insert rules at a certain position which is
problematic for iptables-nft to realize since rule position is not
determined by number but handle of previous or following rule and in
case the rules surrounding the new one are new as well, they don't have
a handle to refer to yet.
Fix this by making use of NFTNL_RULE_POSITION_ID attribute: When
inserting before a rule which does not have a handle, refer to it using
its NFTNL_RULE_ID value. If the latter doesn't exist either, assign a
new one to it.
The last used rule ID value is tracked in a new field of struct
nft_handle which is incremented before each use.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Passing --wait option to iptables-nft-restore led to program abort
because the flag parameter was not skipped. Mimick iptables-restore
behaviour when encountering --wait or --wait-interval options (but still
ignore the parameter).
Fixes: b9d7b49d84bc2 ("xtables-compat: restore: sync options with iptables-restore")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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Currently, when running `iptables-restore --table=X`, where `X` is not the first
table in the rules dump, the restore will fail when parsing the second table:
- a lock is acquird when parsing the first table name
- the table name does not match the parameter to `--table` so processing
continues until the next table
- when processing the next table a lock is acquired, which fails because a lock
is already held
Another app is currently holding the xtables lock. Perhaps you want to use the -w option?
This will release the lock as soon as it's decided the current table won't be
used.
Signed-off-by: Joel Goguen <contact+netfilter@jgoguen.ca>
Signed-off-by: Florian Westphal <fw@strlen.de>
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