On 04/07/2011 01:47 PM, Stefan Berger wrote: > This patch adds support for the evaluation of TCP flags in nwfilters. > > It adds documentation to the web page and extends the tests as well. > Also, the nwfilter schema is extended. > > The following are some example for rules using the tcp flags: > > <rule action='accept' direction='in'> > <tcp state='NONE' flags='SYN/ALL' dsptportstart='80'/> > </rule> > <rule action='drop' direction='in'> > <tcp state='NONE' flags='SYN/ALL'/> > </rule> > > > Signed-off-by: Stefan Berger <[email protected]> > > --- > docs/formatnwfilter.html.in | 10 ++ > docs/schemas/nwfilter.rng | 16 ++++ > src/conf/nwfilter_conf.c | 115 > +++++++++++++++++++++++++++--- > src/conf/nwfilter_conf.h | 9 ++ > src/libvirt_private.syms | 1 > src/nwfilter/nwfilter_ebiptables_driver.c | 9 ++ > tests/nwfilterxml2xmlin/tcp-test.xml | 12 +++ > tests/nwfilterxml2xmlout/tcp-test.xml | 12 +++ > 8 files changed, 174 insertions(+), 10 deletions(-)
ACK, looks reasonable to me, with one optimization nit fixed:
> + int32_t mask = 0x1;
>
> - for (i = 0; int_map[i].val; i++) {
> - if (last_attr != int_map[i].attr &&
> - flags & int_map[i].attr) {
> - if (c >= 1)
> - virBufferVSprintf(buf, "%s", sep);
> - virBufferVSprintf(buf, "%s", int_map[i].val);
> - c++;
> + while (mask) {
> + if ((mask & flags)) {
> + for (i = 0; int_map[i].val; i++) {
> + if (mask == int_map[i].attr) {
> + if (c >= 1)
> + virBufferVSprintf(buf, "%s", sep);
> + virBufferVSprintf(buf, "%s", int_map[i].val);
> + c++;
> + }
> + }
> + flags ^= mask;
> + if (!flags)
> + break;
This if condition should be after...
> }
this brace; otherwise, if flags == 0 on entry, then you will
(needlessly) iterate through all 32 bits of mask, rather than breaking
on the first iteration.
--
Eric Blake [email protected] +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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