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[NETFILTER]: xt_limit: add compat conversion functions 

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2006-09-20 12:07:06 -07:00 committed by David S. Miller
parent 7ce975b9da
commit 02c63cf777
1 changed files with 49 additions and 0 deletions
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49
net/netfilter/xt_limit.c
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@ -135,6 +135,50 @@ ipt_limit_checkentry(const char *tablename,
return 1;
}
#ifdef CONFIG_COMPAT
struct compat_xt_rateinfo {
u_int32_t avg;
u_int32_t burst;
compat_ulong_t prev;
u_int32_t credit;
u_int32_t credit_cap, cost;
u_int32_t master;
};
/* To keep the full "prev" timestamp, the upper 32 bits are stored in the
* master pointer, which does not need to be preserved. */
static void compat_from_user(void *dst, void *src)
{
struct compat_xt_rateinfo *cm = src;
struct xt_rateinfo m = {
.avg = cm->avg,
.burst = cm->burst,
.prev = cm->prev | (unsigned long)cm->master << 32,
.credit = cm->credit,
.credit_cap = cm->credit_cap,
.cost = cm->cost,
};
memcpy(dst, &m, sizeof(m));
}
static int compat_to_user(void __user *dst, void *src)
{
struct xt_rateinfo *m = src;
struct compat_xt_rateinfo cm = {
.avg = m->avg,
.burst = m->burst,
.prev = m->prev,
.credit = m->credit,
.credit_cap = m->credit_cap,
.cost = m->cost,
.master = m->prev >> 32,
};
return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0;
}
#endif /* CONFIG_COMPAT */
static struct xt_match xt_limit_match[] = {
{
.name = "limit",
@ -142,6 +186,11 @@ static struct xt_match xt_limit_match[] = {
.checkentry = ipt_limit_checkentry,
.match = ipt_limit_match,
.matchsize = sizeof(struct xt_rateinfo),
#ifdef CONFIG_COMPAT
.compatsize = sizeof(struct compat_xt_rateinfo),
.compat_from_user = compat_from_user,
.compat_to_user = compat_to_user,
#endif
.me = THIS_MODULE,
},
{