diff options
author | Phil Sutter <phil@nwl.cc> | 2020-11-16 17:20:57 +0100 |
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committer | Phil Sutter <phil@nwl.cc> | 2021-05-17 15:07:02 +0200 |
commit | 9dc50b5b8e4416219c700331c6e301d840f6e55d (patch) | |
tree | 44d2ae242c7a2659200cfd5330e0f492e0517d0f /iptables/xshared.c | |
parent | 3664249f520308e8d9ce6238374f08ac96aedbb6 (diff) |
xshared: Merge invflags handling code
Join invflags handling between iptables, ip6tables, xtables and
arptables. Ebtables still has its own code which differs quite a bit.
In order to use a shared set_option() routine, iptables and ip6tables
need to provide a local 'invflags' variable which is 16bits wide.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Diffstat (limited to 'iptables/xshared.c')
-rw-r--r-- | iptables/xshared.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/iptables/xshared.c b/iptables/xshared.c index afd7a9d6..a3f473ea 100644 --- a/iptables/xshared.c +++ b/iptables/xshared.c @@ -853,3 +853,46 @@ char opt2char(int option) return *ptr; } + +static const int inverse_for_options[NUMBER_OF_OPT] = +{ +/* -n */ 0, +/* -s */ IPT_INV_SRCIP, +/* -d */ IPT_INV_DSTIP, +/* -p */ XT_INV_PROTO, +/* -j */ 0, +/* -v */ 0, +/* -x */ 0, +/* -i */ IPT_INV_VIA_IN, +/* -o */ IPT_INV_VIA_OUT, +/*--line*/ 0, +/* -c */ 0, +/* -f */ IPT_INV_FRAG, +/* 2 */ IPT_INV_SRCDEVADDR, +/* 3 */ IPT_INV_TGTDEVADDR, +/* -l */ IPT_INV_ARPHLN, +/* 4 */ IPT_INV_ARPOP, +/* 5 */ IPT_INV_ARPHRD, +/* 6 */ IPT_INV_PROTO, +}; + +void +set_option(unsigned int *options, unsigned int option, u_int16_t *invflg, + bool invert) +{ + if (*options & option) + xtables_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed", + opt2char(option)); + *options |= option; + + if (invert) { + unsigned int i; + for (i = 0; 1 << i != option; i++); + + if (!inverse_for_options[i]) + xtables_error(PARAMETER_PROBLEM, + "cannot have ! before -%c", + opt2char(option)); + *invflg |= inverse_for_options[i]; + } +} |