6beceee5aa
* return ebt_table from ebt_register_table(), module code will save it into per-netns data for unregistration * duplicate ebt_table at the very beginning of registration -- it's added into list, so one ebt_table wouldn't end up in many lists (and each netns has different one) * introduce underscored tables in individial modules, this is temporary to not break bisection. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
117 lines
2.5 KiB
C
117 lines
2.5 KiB
C
/*
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* ebtable_filter
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*
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* Authors:
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* Bart De Schuymer <bdschuym@pandora.be>
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*
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* April, 2002
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*
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*/
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#include <linux/netfilter_bridge/ebtables.h>
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#include <linux/module.h>
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#define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \
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(1 << NF_BR_LOCAL_OUT))
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static struct ebt_entries initial_chains[] =
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{
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{
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.name = "INPUT",
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.policy = EBT_ACCEPT,
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},
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{
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.name = "FORWARD",
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.policy = EBT_ACCEPT,
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},
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{
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.name = "OUTPUT",
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.policy = EBT_ACCEPT,
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},
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};
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static struct ebt_replace_kernel initial_table =
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{
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.name = "filter",
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.valid_hooks = FILTER_VALID_HOOKS,
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.entries_size = 3 * sizeof(struct ebt_entries),
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.hook_entry = {
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[NF_BR_LOCAL_IN] = &initial_chains[0],
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[NF_BR_FORWARD] = &initial_chains[1],
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[NF_BR_LOCAL_OUT] = &initial_chains[2],
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},
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.entries = (char *)initial_chains,
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};
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static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
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{
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if (valid_hooks & ~FILTER_VALID_HOOKS)
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return -EINVAL;
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return 0;
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}
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static struct ebt_table __frame_filter =
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{
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.name = "filter",
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.table = &initial_table,
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.valid_hooks = FILTER_VALID_HOOKS,
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.lock = __RW_LOCK_UNLOCKED(__frame_filter.lock),
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.check = check,
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.me = THIS_MODULE,
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};
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static struct ebt_table *frame_filter;
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static unsigned int
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ebt_hook(unsigned int hook, struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, int (*okfn)(struct sk_buff *))
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{
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return ebt_do_table(hook, skb, in, out, frame_filter);
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}
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static struct nf_hook_ops ebt_ops_filter[] __read_mostly = {
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{
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.hook = ebt_hook,
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.owner = THIS_MODULE,
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.pf = PF_BRIDGE,
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.hooknum = NF_BR_LOCAL_IN,
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.priority = NF_BR_PRI_FILTER_BRIDGED,
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},
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{
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.hook = ebt_hook,
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.owner = THIS_MODULE,
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.pf = PF_BRIDGE,
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.hooknum = NF_BR_FORWARD,
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.priority = NF_BR_PRI_FILTER_BRIDGED,
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},
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{
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.hook = ebt_hook,
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.owner = THIS_MODULE,
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.pf = PF_BRIDGE,
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.hooknum = NF_BR_LOCAL_OUT,
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.priority = NF_BR_PRI_FILTER_OTHER,
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},
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};
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static int __init ebtable_filter_init(void)
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{
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int ret;
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frame_filter = ebt_register_table(&init_net, &__frame_filter);
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if (IS_ERR(frame_filter))
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return PTR_ERR(frame_filter);
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ret = nf_register_hooks(ebt_ops_filter, ARRAY_SIZE(ebt_ops_filter));
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if (ret < 0)
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ebt_unregister_table(frame_filter);
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return ret;
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}
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static void __exit ebtable_filter_fini(void)
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{
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nf_unregister_hooks(ebt_ops_filter, ARRAY_SIZE(ebt_ops_filter));
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ebt_unregister_table(frame_filter);
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}
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module_init(ebtable_filter_init);
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module_exit(ebtable_filter_fini);
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MODULE_LICENSE("GPL");
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