#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/slab.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"
- }
- }
-};
-
-static struct ipt_table packet_filter = {
+static const struct xt_table packet_filter = {
.name = "filter",
.valid_hooks = FILTER_VALID_HOOKS,
- .lock = RW_LOCK_UNLOCKED,
- .me = THIS_MODULE
+ .me = THIS_MODULE,
+ .af = NFPROTO_IPV4,
+ .priority = NF_IP_PRI_FILTER,
};
-/* The work comes in here from netfilter.c. */
static unsigned int
-ipt_hook(unsigned int hook,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
+iptable_filter_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(pskb, hook, in, out, &packet_filter, NULL);
-}
+ const struct net *net;
-static unsigned int
-ipt_local_out_hook(unsigned int hook,
- struct sk_buff **pskb,
- 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 (net_ratelimit())
- printk("ipt_hook: happy cracking.\n");
+ if (hook == NF_INET_LOCAL_OUT &&
+ (skb->len < sizeof(struct iphdr) ||
+ ip_hdrlen(skb) < sizeof(struct iphdr)))
+ /* root is playing with raw sockets. */
return NF_ACCEPT;
- }
- return ipt_do_table(pskb, hook, in, out, &packet_filter, NULL);
+ net = dev_net((in != NULL) ? in : out);
+ return ipt_do_table(skb, hook, in, out, net->ipv4.iptable_filter);
}
-static struct nf_hook_ops ipt_ops[] = {
- {
- .hook = ipt_hook,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_IN,
- .priority = NF_IP_PRI_FILTER,
- },
- {
- .hook = ipt_hook,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_FORWARD,
- .priority = NF_IP_PRI_FILTER,
- },
- {
- .hook = ipt_local_out_hook,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_OUT,
- .priority = NF_IP_PRI_FILTER,
- },
-};
+static struct nf_hook_ops *filter_ops __read_mostly;
/* Default to forward because I got too much mail already. */
static int forward = NF_ACCEPT;
module_param(forward, bool, 0000);
-static int __init init(void)
+static int __net_init iptable_filter_net_init(struct net *net)
+{
+ struct ipt_replace *repl;
+
+ repl = ipt_alloc_initial_table(&packet_filter);
+ if (repl == NULL)
+ return -ENOMEM;
+ /* Entry 1 is the FORWARD hook */
+ ((struct ipt_standard *)repl->entries)[1].target.verdict =
+ -forward - 1;
+
+ net->ipv4.iptable_filter =
+ ipt_register_table(net, &packet_filter, repl);
+ kfree(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, 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;
return -EINVAL;
}
- /* 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;
/* Register hooks */
- ret = nf_register_hook(&ipt_ops[0]);
- if (ret < 0)
+ filter_ops = xt_hook_link(&packet_filter, iptable_filter_hook);
+ if (IS_ERR(filter_ops)) {
+ ret = PTR_ERR(filter_ops);
goto cleanup_table;
-
- ret = nf_register_hook(&ipt_ops[1]);
- if (ret < 0)
- goto cleanup_hook0;
-
- ret = nf_register_hook(&ipt_ops[2]);
- if (ret < 0)
- goto cleanup_hook1;
+ }
return ret;
- cleanup_hook1:
- nf_unregister_hook(&ipt_ops[1]);
- cleanup_hook0:
- nf_unregister_hook(&ipt_ops[0]);
cleanup_table:
- ipt_unregister_table(&packet_filter);
-
+ unregister_pernet_subsys(&iptable_filter_net_ops);
return ret;
}
-static void __exit fini(void)
+static void __exit iptable_filter_fini(void)
{
- unsigned int i;
-
- for (i = 0; i < sizeof(ipt_ops)/sizeof(struct nf_hook_ops); i++)
- nf_unregister_hook(&ipt_ops[i]);
-
- ipt_unregister_table(&packet_filter);
+ xt_hook_unlink(&packet_filter, filter_ops);
+ unregister_pernet_subsys(&iptable_filter_net_ops);
}
-module_init(init);
-module_exit(fini);
+module_init(iptable_filter_init);
+module_exit(iptable_filter_fini);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff