MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("iptables mangle table");
-#define MANGLE_VALID_HOOKS ((1 << NF_IP_PRE_ROUTING) | \
- (1 << NF_IP_LOCAL_IN) | \
- (1 << NF_IP_FORWARD) | \
- (1 << NF_IP_LOCAL_OUT) | \
- (1 << NF_IP_POST_ROUTING))
-
-/* Ouch - five different hooks? Maybe this should be a config option..... -- BC */
-static struct
-{
- struct ipt_replace repl;
- struct ipt_standard entries[5];
- struct ipt_error term;
-} initial_table __initdata = {
- .repl = {
- .name = "mangle",
- .valid_hooks = MANGLE_VALID_HOOKS,
- .num_entries = 6,
- .size = sizeof(struct ipt_standard) * 5 + sizeof(struct ipt_error),
- .hook_entry = {
- [NF_IP_PRE_ROUTING] = 0,
- [NF_IP_LOCAL_IN] = sizeof(struct ipt_standard),
- [NF_IP_FORWARD] = sizeof(struct ipt_standard) * 2,
- [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 3,
- [NF_IP_POST_ROUTING] = sizeof(struct ipt_standard) * 4,
- },
- .underflow = {
- [NF_IP_PRE_ROUTING] = 0,
- [NF_IP_LOCAL_IN] = sizeof(struct ipt_standard),
- [NF_IP_FORWARD] = sizeof(struct ipt_standard) * 2,
- [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 3,
- [NF_IP_POST_ROUTING] = sizeof(struct ipt_standard) * 4,
- },
- },
- .entries = {
- IPT_STANDARD_INIT(NF_ACCEPT), /* PRE_ROUTING */
- IPT_STANDARD_INIT(NF_ACCEPT), /* LOCAL_IN */
- IPT_STANDARD_INIT(NF_ACCEPT), /* FORWARD */
- IPT_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
- IPT_STANDARD_INIT(NF_ACCEPT), /* POST_ROUTING */
- },
- .term = IPT_ERROR_INIT, /* ERROR */
-};
+#define MANGLE_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | \
+ (1 << NF_INET_LOCAL_IN) | \
+ (1 << NF_INET_FORWARD) | \
+ (1 << NF_INET_LOCAL_OUT) | \
+ (1 << NF_INET_POST_ROUTING))
-static struct xt_table packet_mangler = {
+static const struct xt_table packet_mangler = {
.name = "mangle",
.valid_hooks = MANGLE_VALID_HOOKS,
- .lock = RW_LOCK_UNLOCKED,
.me = THIS_MODULE,
- .af = AF_INET,
+ .af = NFPROTO_IPV4,
+ .priority = NF_IP_PRI_MANGLE,
};
-/* The work comes in here from netfilter.c. */
-static unsigned int
-ipt_route_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, &packet_mangler);
-}
-
static unsigned int
ipt_local_hook(unsigned int hook,
struct sk_buff *skb,
u_int32_t mark;
/* root is playing with raw sockets. */
- if (skb->len < sizeof(struct iphdr)
- || ip_hdrlen(skb) < sizeof(struct iphdr)) {
- if (net_ratelimit())
- printk("iptable_mangle: ignoring short SOCK_RAW "
- "packet.\n");
+ if (skb->len < sizeof(struct iphdr) ||
+ ip_hdrlen(skb) < sizeof(struct iphdr))
return NF_ACCEPT;
- }
/* Save things which could affect route */
mark = skb->mark;
daddr = iph->daddr;
tos = iph->tos;
- ret = ipt_do_table(skb, hook, in, out, &packet_mangler);
+ ret = ipt_do_table(skb, hook, in, out,
+ dev_net(out)->ipv4.iptable_mangle);
/* Reroute for ANY change. */
if (ret != NF_DROP && ret != NF_STOLEN && ret != NF_QUEUE) {
iph = ip_hdr(skb);
return ret;
}
-static struct nf_hook_ops ipt_ops[] = {
- {
- .hook = ipt_route_hook,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_PRE_ROUTING,
- .priority = NF_IP_PRI_MANGLE,
- },
- {
- .hook = ipt_route_hook,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_IN,
- .priority = NF_IP_PRI_MANGLE,
- },
- {
- .hook = ipt_route_hook,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_FORWARD,
- .priority = NF_IP_PRI_MANGLE,
- },
- {
- .hook = ipt_local_hook,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_OUT,
- .priority = NF_IP_PRI_MANGLE,
- },
- {
- .hook = ipt_route_hook,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_POST_ROUTING,
- .priority = NF_IP_PRI_MANGLE,
- },
+/* The work comes in here from netfilter.c. */
+static unsigned int
+iptable_mangle_hook(unsigned int hook,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ if (hook == NF_INET_LOCAL_OUT)
+ return ipt_local_hook(hook, skb, in, out, okfn);
+ if (hook == NF_INET_POST_ROUTING)
+ return ipt_do_table(skb, hook, in, out,
+ dev_net(out)->ipv4.iptable_mangle);
+ /* PREROUTING/INPUT/FORWARD: */
+ return ipt_do_table(skb, hook, in, out,
+ dev_net(in)->ipv4.iptable_mangle);
+}
+
+static struct nf_hook_ops *mangle_ops __read_mostly;
+
+static int __net_init iptable_mangle_net_init(struct net *net)
+{
+ struct ipt_replace *repl;
+
+ repl = ipt_alloc_initial_table(&packet_mangler);
+ if (repl == NULL)
+ return -ENOMEM;
+ net->ipv4.iptable_mangle =
+ ipt_register_table(net, &packet_mangler, repl);
+ kfree(repl);
+ if (IS_ERR(net->ipv4.iptable_mangle))
+ return PTR_ERR(net->ipv4.iptable_mangle);
+ return 0;
+}
+
+static void __net_exit iptable_mangle_net_exit(struct net *net)
+{
+ ipt_unregister_table(net, net->ipv4.iptable_mangle);
+}
+
+static struct pernet_operations iptable_mangle_net_ops = {
+ .init = iptable_mangle_net_init,
+ .exit = iptable_mangle_net_exit,
};
static int __init iptable_mangle_init(void)
{
int ret;
- /* Register table */
- ret = ipt_register_table(&packet_mangler, &initial_table.repl);
+ ret = register_pernet_subsys(&iptable_mangle_net_ops);
if (ret < 0)
return ret;
/* Register hooks */
- ret = nf_register_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
- if (ret < 0)
+ mangle_ops = xt_hook_link(&packet_mangler, iptable_mangle_hook);
+ if (IS_ERR(mangle_ops)) {
+ ret = PTR_ERR(mangle_ops);
goto cleanup_table;
+ }
return ret;
cleanup_table:
- ipt_unregister_table(&packet_mangler);
+ unregister_pernet_subsys(&iptable_mangle_net_ops);
return ret;
}
static void __exit iptable_mangle_fini(void)
{
- nf_unregister_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
- ipt_unregister_table(&packet_mangler);
+ xt_hook_unlink(&packet_mangler, mangle_ops);
+ unregister_pernet_subsys(&iptable_mangle_net_ops);
}
module_init(iptable_mangle_init);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff