Commit 3cdc7c95 authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller
Browse files

[NETFILTER]: Change {ip,ip6,arp}_tables to use centralized error checking


Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 37f9f733
......@@ -480,6 +480,11 @@ static inline int check_entry(struct arpt_entry *e, const char *name, unsigned i
}
t->u.kernel.target = target;
ret = xt_check_target(target, NF_ARP, t->u.target_size - sizeof(*t),
name, e->comefrom, 0, 0);
if (ret)
goto err;
if (t->u.kernel.target == &arpt_standard_target) {
if (!standard_check(t, size)) {
ret = -EINVAL;
......@@ -490,16 +495,16 @@ static inline int check_entry(struct arpt_entry *e, const char *name, unsigned i
t->u.target_size
- sizeof(*t),
e->comefrom)) {
module_put(t->u.kernel.target->me);
duprintf("arp_tables: check failed for `%s'.\n",
t->u.kernel.target->name);
ret = -EINVAL;
goto out;
goto err;
}
(*i)++;
return 0;
err:
module_put(t->u.kernel.target->me);
out:
return ret;
}
......
......@@ -508,6 +508,7 @@ check_match(struct ipt_entry_match *m,
unsigned int *i)
{
struct ipt_match *match;
int ret;
match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name,
m->u.user.revision),
......@@ -518,18 +519,27 @@ check_match(struct ipt_entry_match *m,
}
m->u.kernel.match = match;
ret = xt_check_match(match, AF_INET, m->u.match_size - sizeof(*m),
name, hookmask, ip->proto,
ip->invflags & IPT_INV_PROTO);
if (ret)
goto err;
if (m->u.kernel.match->checkentry
&& !m->u.kernel.match->checkentry(name, ip, m->data,
m->u.match_size - sizeof(*m),
hookmask)) {
module_put(m->u.kernel.match->me);
duprintf("ip_tables: check failed for `%s'.\n",
m->u.kernel.match->name);
return -EINVAL;
ret = -EINVAL;
goto err;
}
(*i)++;
return 0;
err:
module_put(m->u.kernel.match->me);
return ret;
}
static struct ipt_target ipt_standard_target;
......@@ -565,6 +575,12 @@ check_entry(struct ipt_entry *e, const char *name, unsigned int size,
}
t->u.kernel.target = target;
ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t),
name, e->comefrom, e->ip.proto,
e->ip.invflags & IPT_INV_PROTO);
if (ret)
goto err;
if (t->u.kernel.target == &ipt_standard_target) {
if (!standard_check(t, size)) {
ret = -EINVAL;
......@@ -575,16 +591,16 @@ check_entry(struct ipt_entry *e, const char *name, unsigned int size,
t->u.target_size
- sizeof(*t),
e->comefrom)) {
module_put(t->u.kernel.target->me);
duprintf("ip_tables: check failed for `%s'.\n",
t->u.kernel.target->name);
ret = -EINVAL;
goto cleanup_matches;
goto err;
}
(*i)++;
return 0;
err:
module_put(t->u.kernel.target->me);
cleanup_matches:
IPT_MATCH_ITERATE(e, cleanup_match, &j);
return ret;
......
......@@ -575,6 +575,7 @@ check_match(struct ip6t_entry_match *m,
unsigned int *i)
{
struct ip6t_match *match;
int ret;
match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name,
m->u.user.revision),
......@@ -585,18 +586,27 @@ check_match(struct ip6t_entry_match *m,
}
m->u.kernel.match = match;
ret = xt_check_match(match, AF_INET6, m->u.match_size - sizeof(*m),
name, hookmask, ipv6->proto,
ipv6->invflags & IP6T_INV_PROTO);
if (ret)
goto err;
if (m->u.kernel.match->checkentry
&& !m->u.kernel.match->checkentry(name, ipv6, m->data,
m->u.match_size - sizeof(*m),
hookmask)) {
module_put(m->u.kernel.match->me);
duprintf("ip_tables: check failed for `%s'.\n",
m->u.kernel.match->name);
return -EINVAL;
ret = -EINVAL;
goto err;
}
(*i)++;
return 0;
err:
module_put(m->u.kernel.match->me);
return ret;
}
static struct ip6t_target ip6t_standard_target;
......@@ -632,6 +642,12 @@ check_entry(struct ip6t_entry *e, const char *name, unsigned int size,
}
t->u.kernel.target = target;
ret = xt_check_target(target, AF_INET6, t->u.target_size - sizeof(*t),
name, e->comefrom, e->ipv6.proto,
e->ipv6.invflags & IP6T_INV_PROTO);
if (ret)
goto err;
if (t->u.kernel.target == &ip6t_standard_target) {
if (!standard_check(t, size)) {
ret = -EINVAL;
......@@ -642,16 +658,16 @@ check_entry(struct ip6t_entry *e, const char *name, unsigned int size,
t->u.target_size
- sizeof(*t),
e->comefrom)) {
module_put(t->u.kernel.target->me);
duprintf("ip_tables: check failed for `%s'.\n",
t->u.kernel.target->name);
ret = -EINVAL;
goto cleanup_matches;
goto err;
}
(*i)++;
return 0;
err:
module_put(t->u.kernel.target->me);
cleanup_matches:
IP6T_MATCH_ITERATE(e, cleanup_match, &j);
return ret;
......
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