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geoip: remove unused code and unneeded per-info refcount

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- freeing userspace memory is not the kernel's job, really.
- checkentry is called exactly once, as is destroy.
This commit is contained in:
Jan Engelhardt
2008-03-17 12:49:28 +01:00
parent 3554e348bc
commit f1615a03f3
3 changed files with 0 additions and 67 deletions
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53
extensions/xt_geoip.c
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@@ -150,24 +150,6 @@ static bool xt_geoip_mt_checkentry(const char *tablename,
struct geoip_info *node;
u_int8_t i;
/* FIXME: Call a function to free userspace allocated memory.
* As Martin J. said; this match might eat lot of memory
* if commited with iptables-restore --noflush
void (*gfree)(struct geoip_info *oldmem);
gfree = info->fini;
*/
/* If info->refcount isn't NULL, then
* it means that checkentry() already
* initialized this entry. Increase a
* refcount to prevent destroy() of
* this entry. */
if (info->refcount != NULL) {
atomic_inc((atomic_t *)info->refcount);
return 1;
}
for (i = 0; i < info->count; i++) {
if ((node = find_node(info->cc[i])) != NULL)
@@ -180,15 +162,6 @@ static bool xt_geoip_mt_checkentry(const char *tablename,
return 0;
}
/* Free userspace allocated memory for that country.
* FIXME: It's a bit odd to call this function everytime
* we process a country. Would be nice to call
* it once after all countries've been processed.
* - SJ
* *not implemented for now*
gfree(info->mem[i]);
*/
/* Overwrite the now-useless pointer info->mem[i] with
* a pointer to the node's kernelspace structure.
* This avoids searching for a node in the match() and
@@ -197,18 +170,6 @@ static bool xt_geoip_mt_checkentry(const char *tablename,
info->mem[i] = node;
}
/* We allocate some memory and give info->refcount a pointer
* to this memory. This prevents checkentry() from increasing a refcount
* different from the one used by destroy().
* For explanation, see http://www.mail-archive.com/netfilter-devel@lists.samba.org/msg00625.html
*/
info->refcount = kmalloc(sizeof(u_int8_t), GFP_KERNEL);
if (info->refcount == NULL) {
printk(KERN_ERR "xt_geoip: failed to allocate `refcount' memory\n");
return 0;
}
*(info->refcount) = 1;
return 1;
}
@@ -219,20 +180,6 @@ static void xt_geoip_mt_destroy(const struct xt_match *matcn,
struct geoip_info *node; /* this keeps the code sexy */
u_int8_t i;
/* Decrease the previously increased refcount in checkentry()
* If it's equal to 1, we know this entry is just moving
* but not removed. We simply return to avoid useless destroy()
* proce ssing.
*/
atomic_dec((atomic_t *)info->refcount);
if (*info->refcount)
return;
/* Don't leak my memory, you idiot.
* Bug found with nfsim.. the netfilter's best
* friend. --peejix */
kfree(info->refcount);
/* This entry has been removed from the table so
* decrease the refcount of all countries it is
* using.