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author | Phil Sutter <phil@nwl.cc> | 2018-08-24 13:26:57 +0200 |
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committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2018-10-04 02:11:17 +0200 |
commit | 14a9968a56f8b35138bab172aa7ce796f5d98e03 (patch) | |
tree | a901e04ad134ee30ec1fa9b9606e05e7c083898d /src/xfrm.c | |
parent | a493147e60d350aca4197975281bf2ffe4cd1009 (diff) |
parser_bison: Fix for ECN keyword in LHS of relational
Of all possible TCP flags, 'ecn' is special since it is recognized by
lex as a keyword (there is a a field in IPv4 and IPv6 headers with the
same name). Therefore it is listed in keyword_expr, but that was
sufficient for RHS only. The following statement reproduces the issue:
| tcp flags & (syn | ecn) == (syn | ecn)
The solution is to limit binop expressions to accept an RHS expression
on RHS ("real" LHS expressions don't make much sense there anyway),
which then allows keyword_expr to occur there. In order to maintain the
recursive behaviour if braces are present, allow primary_rhs_expr to
consist of a basic_rhs_expr enclosed in braces. This in turn requires
for braced RHS part in relational_expr to be dropped, otherwise bison
complains about shift/reduce conflict.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'src/xfrm.c')
0 files changed, 0 insertions, 0 deletions