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% nft describe ip option rr value
segmentation fault
after this fix, this exits with 'Error: unknown ip option type/field'.
Problem is that 'rr' doesn't have a value template, so the template struct is
all-zeroes, so we crash when trying to use tmpl->dtype (its NULL).
Furthermore, expr_describe tries to print expr->identifier but expr is
exthdr, not symbol: ->identifier contains garbage.
Signed-off-by: Florian Westphal <fw@strlen.de>
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Its always 0, so remove it.
Looks like this was intended to support variable options that have
array-like members, but so far this isn't implemented, better remove
dead code and implement it properly when such support is needed.
Signed-off-by: Florian Westphal <fw@strlen.de>
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nft currently doesn't allow to check for presence of arbitrary tcp options.
Only known options where nft provides a template can be tested for.
This allows to test for presence of raw protocol values as well.
Example:
tcp option 42 exists
Signed-off-by: Florian Westphal <fw@strlen.de>
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Currently we're limited to ten template fields in exthdr_desc struct.
Using a single enum for all tpc option fields thus won't work
indefinitely (TCPOPTHDR_FIELD_TSECR is 9) when new option templates get
added.
Fortunately we can just use one enum per tcp option to avoid this.
As a side effect this also allows to simplify the sack offset
calculations. Rather than computing that on-the-fly, just add extra
fields to the SACK template.
expr->exthdr.offset now holds the 'raw' value, filled in from the option
template. This would ease implementation of 'raw option matching'
using offset and length to load from the option.
Signed-off-by: Florian Westphal <fw@strlen.de>
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Fixes: 226a0e072d5c ("exthdr: add support for matching IPv4 options")
Reported-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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