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netfilter: ebtables: split do_replace into two functions 

once CONFIG_COMPAT support is merged this allows
to call do_replace_finish() after doing the CONFIG_COMPAT conversion
instead of copy & pasting this.

Signed-off-by: Florian Westphal <fw@strlen.de>
This commit is contained in:
Florian Westphal 2010-02-04 18:38:53 +01:00
parent 3e5e524ffb
commit e788759f44
1 changed files with 71 additions and 65 deletions
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136
net/bridge/netfilter/ebtables.c
View File

@ -959,91 +959,45 @@ static void get_counters(const struct ebt_counter *oldcounters,
}
}
/* replace the table */
static int do_replace(struct net *net, const void __user *user,
unsigned int len)
static int do_replace_finish(struct net *net, struct ebt_replace *repl,
struct ebt_table_info *newinfo)
{
int ret, i, countersize;
struct ebt_table_info *newinfo;
struct ebt_replace tmp;
struct ebt_table *t;
int ret, i;
struct ebt_counter *counterstmp = NULL;
/* used to be able to unlock earlier */
struct ebt_table_info *table;
if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
return -EFAULT;
if (len != sizeof(tmp) + tmp.entries_size) {
BUGPRINT("Wrong len argument\n");
return -EINVAL;
}
if (tmp.entries_size == 0) {
BUGPRINT("Entries_size never zero\n");
return -EINVAL;
}
/* overflow check */
if (tmp.nentries >= ((INT_MAX - sizeof(struct ebt_table_info)) / NR_CPUS -
SMP_CACHE_BYTES) / sizeof(struct ebt_counter))
return -ENOMEM;
if (tmp.num_counters >= INT_MAX / sizeof(struct ebt_counter))
return -ENOMEM;
countersize = COUNTER_OFFSET(tmp.nentries) * nr_cpu_ids;
newinfo = vmalloc(sizeof(*newinfo) + countersize);
if (!newinfo)
return -ENOMEM;
if (countersize)
memset(newinfo->counters, 0, countersize);
newinfo->entries = vmalloc(tmp.entries_size);
if (!newinfo->entries) {
ret = -ENOMEM;
goto free_newinfo;
}
if (copy_from_user(
newinfo->entries, tmp.entries, tmp.entries_size) != 0) {
BUGPRINT("Couldn't copy entries from userspace\n");
ret = -EFAULT;
goto free_entries;
}
struct ebt_table *t;
/* the user wants counters back
the check on the size is done later, when we have the lock */
if (tmp.num_counters) {
counterstmp = vmalloc(tmp.num_counters * sizeof(*counterstmp));
if (!counterstmp) {
ret = -ENOMEM;
goto free_entries;
}
if (repl->num_counters) {
unsigned long size = repl->num_counters * sizeof(*counterstmp);
counterstmp = vmalloc(size);
if (!counterstmp)
return -ENOMEM;
}
else
counterstmp = NULL;
/* this can get initialized by translate_table() */
newinfo->chainstack = NULL;
ret = ebt_verify_pointers(&tmp, newinfo);
ret = ebt_verify_pointers(repl, newinfo);
if (ret != 0)
goto free_counterstmp;
ret = translate_table(net, tmp.name, newinfo);
ret = translate_table(net, repl->name, newinfo);
if (ret != 0)
goto free_counterstmp;
t = find_table_lock(net, tmp.name, &ret, &ebt_mutex);
t = find_table_lock(net, repl->name, &ret, &ebt_mutex);
if (!t) {
ret = -ENOENT;
goto free_iterate;
}
/* the table doesn't like it */
if (t->check && (ret = t->check(newinfo, tmp.valid_hooks)))
if (t->check && (ret = t->check(newinfo, repl->valid_hooks)))
goto free_unlock;
if (tmp.num_counters && tmp.num_counters != t->private->nentries) {
if (repl->num_counters && repl->num_counters != t->private->nentries) {
BUGPRINT("Wrong nr. of counters requested\n");
ret = -EINVAL;
goto free_unlock;
@ -1059,7 +1013,7 @@ static int do_replace(struct net *net, const void __user *user,
module_put(t->me);
/* we need an atomic snapshot of the counters */
write_lock_bh(&t->lock);
if (tmp.num_counters)
if (repl->num_counters)
get_counters(t->private->counters, counterstmp,
t->private->nentries);
@ -1070,10 +1024,9 @@ static int do_replace(struct net *net, const void __user *user,
allocation. Only reason why this is done is because this way the lock
is held only once, while this doesn't bring the kernel into a
dangerous state. */
if (tmp.num_counters &&
copy_to_user(tmp.counters, counterstmp,
tmp.num_counters * sizeof(struct ebt_counter))) {
BUGPRINT("Couldn't copy counters to userspace\n");
if (repl->num_counters &&
copy_to_user(repl->counters, counterstmp,
repl->num_counters * sizeof(struct ebt_counter))) {
ret = -EFAULT;
}
else
@ -1107,6 +1060,59 @@ free_counterstmp:
vfree(newinfo->chainstack[i]);
vfree(newinfo->chainstack);
}
return ret;
}
/* replace the table */
static int do_replace(struct net *net, const void __user *user,
unsigned int len)
{
int ret, countersize;
struct ebt_table_info *newinfo;
struct ebt_replace tmp;
if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
return -EFAULT;
if (len != sizeof(tmp) + tmp.entries_size) {
BUGPRINT("Wrong len argument\n");
return -EINVAL;
}
if (tmp.entries_size == 0) {
BUGPRINT("Entries_size never zero\n");
return -EINVAL;
}
/* overflow check */
if (tmp.nentries >= ((INT_MAX - sizeof(struct ebt_table_info)) /
NR_CPUS - SMP_CACHE_BYTES) / sizeof(struct ebt_counter))
return -ENOMEM;
if (tmp.num_counters >= INT_MAX / sizeof(struct ebt_counter))
return -ENOMEM;
countersize = COUNTER_OFFSET(tmp.nentries) * nr_cpu_ids;
newinfo = vmalloc(sizeof(*newinfo) + countersize);
if (!newinfo)
return -ENOMEM;
if (countersize)
memset(newinfo->counters, 0, countersize);
newinfo->entries = vmalloc(tmp.entries_size);
if (!newinfo->entries) {
ret = -ENOMEM;
goto free_newinfo;
}
if (copy_from_user(
newinfo->entries, tmp.entries, tmp.entries_size) != 0) {
BUGPRINT("Couldn't copy entries from userspace\n");
ret = -EFAULT;
goto free_entries;
}
ret = do_replace_finish(net, &tmp, newinfo);
if (ret == 0)
return ret;
free_entries:
vfree(newinfo->entries);
free_newinfo: