#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/netfilter_ipv4/ip_tables.h>
+#include <net/ip.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("iptables filter table");
-#define FILTER_VALID_HOOKS ((1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) | (1 << NF_IP_LOCAL_OUT))
+#define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \
+ (1 << NF_INET_FORWARD) | \
+ (1 << NF_INET_LOCAL_OUT))
static struct
{
struct ipt_replace repl;
struct ipt_standard entries[3];
struct ipt_error term;
-} initial_table __initdata
-= { { "filter", FILTER_VALID_HOOKS, 4,
- sizeof(struct ipt_standard) * 3 + sizeof(struct ipt_error),
- { [NF_IP_LOCAL_IN] = 0,
- [NF_IP_FORWARD] = sizeof(struct ipt_standard),
- [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 2 },
- { [NF_IP_LOCAL_IN] = 0,
- [NF_IP_FORWARD] = sizeof(struct ipt_standard),
- [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 2 },
- 0, NULL, { } },
- {
- /* LOCAL_IN */
- { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
- 0,
- sizeof(struct ipt_entry),
- sizeof(struct ipt_standard),
- 0, { 0, 0 }, { } },
- { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
- -NF_ACCEPT - 1 } },
- /* FORWARD */
- { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
- 0,
- sizeof(struct ipt_entry),
- sizeof(struct ipt_standard),
- 0, { 0, 0 }, { } },
- { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
- -NF_ACCEPT - 1 } },
- /* LOCAL_OUT */
- { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
- 0,
- sizeof(struct ipt_entry),
- sizeof(struct ipt_standard),
- 0, { 0, 0 }, { } },
- { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
- -NF_ACCEPT - 1 } }
- },
- /* ERROR */
- { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
- 0,
- sizeof(struct ipt_entry),
- sizeof(struct ipt_error),
- 0, { 0, 0 }, { } },
- { { { { IPT_ALIGN(sizeof(struct ipt_error_target)), IPT_ERROR_TARGET } },
- { } },
- "ERROR"
- }
- }
+} initial_table __net_initdata = {
+ .repl = {
+ .name = "filter",
+ .valid_hooks = FILTER_VALID_HOOKS,
+ .num_entries = 4,
+ .size = sizeof(struct ipt_standard) * 3 + sizeof(struct ipt_error),
+ .hook_entry = {
+ [NF_INET_LOCAL_IN] = 0,
+ [NF_INET_FORWARD] = sizeof(struct ipt_standard),
+ [NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard) * 2,
+ },
+ .underflow = {
+ [NF_INET_LOCAL_IN] = 0,
+ [NF_INET_FORWARD] = sizeof(struct ipt_standard),
+ [NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard) * 2,
+ },
+ },
+ .entries = {
+ IPT_STANDARD_INIT(NF_ACCEPT), /* LOCAL_IN */
+ IPT_STANDARD_INIT(NF_ACCEPT), /* FORWARD */
+ IPT_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
+ },
+ .term = IPT_ERROR_INIT, /* ERROR */
};
-static struct ipt_table packet_filter = {
+static struct xt_table packet_filter = {
.name = "filter",
.valid_hooks = FILTER_VALID_HOOKS,
- .lock = RW_LOCK_UNLOCKED,
+ .lock = __RW_LOCK_UNLOCKED(packet_filter.lock),
.me = THIS_MODULE,
.af = AF_INET,
};
/* The work comes in here from netfilter.c. */
+static unsigned int
+ipt_local_in_hook(unsigned int hook,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ return ipt_do_table(skb, hook, in, out,
+ nf_local_in_net(in, out)->ipv4.iptable_filter);
+}
+
static unsigned int
ipt_hook(unsigned int hook,
- struct sk_buff **pskb,
+ struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
- return ipt_do_table(pskb, hook, in, out, &packet_filter);
+ return ipt_do_table(skb, hook, in, out,
+ nf_forward_net(in, out)->ipv4.iptable_filter);
}
static unsigned int
ipt_local_out_hook(unsigned int hook,
- struct sk_buff **pskb,
+ struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
/* root is playing with raw sockets. */
- if ((*pskb)->len < sizeof(struct iphdr)
- || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
+ if (skb->len < sizeof(struct iphdr) ||
+ ip_hdrlen(skb) < sizeof(struct iphdr)) {
if (net_ratelimit())
- printk("ipt_hook: happy cracking.\n");
+ printk("iptable_filter: ignoring short SOCK_RAW "
+ "packet.\n");
return NF_ACCEPT;
}
- return ipt_do_table(pskb, hook, in, out, &packet_filter);
+ return ipt_do_table(skb, hook, in, out,
+ nf_local_out_net(in, out)->ipv4.iptable_filter);
}
-static struct nf_hook_ops ipt_ops[] = {
+static struct nf_hook_ops ipt_ops[] __read_mostly = {
{
- .hook = ipt_hook,
+ .hook = ipt_local_in_hook,
.owner = THIS_MODULE,
.pf = PF_INET,
- .hooknum = NF_IP_LOCAL_IN,
+ .hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP_PRI_FILTER,
},
{
.hook = ipt_hook,
.owner = THIS_MODULE,
.pf = PF_INET,
- .hooknum = NF_IP_FORWARD,
+ .hooknum = NF_INET_FORWARD,
.priority = NF_IP_PRI_FILTER,
},
{
.hook = ipt_local_out_hook,
.owner = THIS_MODULE,
.pf = PF_INET,
- .hooknum = NF_IP_LOCAL_OUT,
+ .hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP_PRI_FILTER,
},
};
static int forward = NF_ACCEPT;
module_param(forward, bool, 0000);
+static int __net_init iptable_filter_net_init(struct net *net)
+{
+ /* Register table */
+ net->ipv4.iptable_filter =
+ ipt_register_table(net, &packet_filter, &initial_table.repl);
+ if (IS_ERR(net->ipv4.iptable_filter))
+ return PTR_ERR(net->ipv4.iptable_filter);
+ return 0;
+}
+
+static void __net_exit iptable_filter_net_exit(struct net *net)
+{
+ ipt_unregister_table(net->ipv4.iptable_filter);
+}
+
+static struct pernet_operations iptable_filter_net_ops = {
+ .init = iptable_filter_net_init,
+ .exit = iptable_filter_net_exit,
+};
+
static int __init iptable_filter_init(void)
{
int ret;
/* Entry 1 is the FORWARD hook */
initial_table.entries[1].target.verdict = -forward - 1;
- /* Register table */
- ret = ipt_register_table(&packet_filter, &initial_table.repl);
+ ret = register_pernet_subsys(&iptable_filter_net_ops);
if (ret < 0)
return ret;
return ret;
cleanup_table:
- ipt_unregister_table(&packet_filter);
+ unregister_pernet_subsys(&iptable_filter_net_ops);
return ret;
}
static void __exit iptable_filter_fini(void)
{
nf_unregister_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
- ipt_unregister_table(&packet_filter);
+ unregister_pernet_subsys(&iptable_filter_net_ops);
}
module_init(iptable_filter_init);