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netfilter: xt_physdev fixes

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1) physdev_mt() incorrectly assumes nulldevname[] is aligned on an int

2) It also uses word comparisons, while it could use long word ones.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Eric Dumazet 2009-02-18 19:11:39 +01:00 committed by Patrick McHardy
parent cfac5ef7b9
commit 4f1c3b7e7e
1 changed files with 11 additions and 12 deletions
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23
net/netfilter/xt_physdev.c
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@ -24,9 +24,9 @@ static bool
physdev_mt(const struct sk_buff *skb, const struct xt_match_param *par)
{
int i;
static const char nulldevname[IFNAMSIZ];
static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
const struct xt_physdev_info *info = par->matchinfo;
bool ret;
unsigned long ret;
const char *indev, *outdev;
const struct nf_bridge_info *nf_bridge;
@ -68,10 +68,10 @@ physdev_mt(const struct sk_buff *skb, const struct xt_match_param *par)
if (!(info->bitmask & XT_PHYSDEV_OP_IN))
goto match_outdev;
indev = nf_bridge->physindev ? nf_bridge->physindev->name : nulldevname;
for (i = 0, ret = false; i < IFNAMSIZ/sizeof(unsigned int); i++) {
ret |= (((const unsigned int *)indev)[i]
^ ((const unsigned int *)info->physindev)[i])
& ((const unsigned int *)info->in_mask)[i];
for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
ret |= (((const unsigned long *)indev)[i]
^ ((const unsigned long *)info->physindev)[i])
& ((const unsigned long *)info->in_mask)[i];
}
if (!ret ^ !(info->invert & XT_PHYSDEV_OP_IN))
@ -82,13 +82,12 @@ match_outdev:
return true;
outdev = nf_bridge->physoutdev ?
nf_bridge->physoutdev->name : nulldevname;
for (i = 0, ret = false; i < IFNAMSIZ/sizeof(unsigned int); i++) {
ret |= (((const unsigned int *)outdev)[i]
^ ((const unsigned int *)info->physoutdev)[i])
& ((const unsigned int *)info->out_mask)[i];
for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
ret |= (((const unsigned long *)outdev)[i]
^ ((const unsigned long *)info->physoutdev)[i])
& ((const unsigned long *)info->out_mask)[i];
}
return ret ^ !(info->invert & XT_PHYSDEV_OP_OUT);
return (!!ret ^ !(info->invert & XT_PHYSDEV_OP_OUT));
}
static bool physdev_mt_check(const struct xt_mtchk_param *par)