![Patrick McHardy](/assets/img/avatar_default.png)
Clean up hook registration by makeing use of the new mass registration and unregistration helpers. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
209 lines
4.4 KiB
C
209 lines
4.4 KiB
C
/*
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* Filtering ARP tables module.
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*
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* Copyright (C) 2002 David S. Miller (davem@redhat.com)
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*
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*/
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#include <linux/module.h>
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#include <linux/netfilter_arp/arp_tables.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
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MODULE_DESCRIPTION("arptables filter table");
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#define FILTER_VALID_HOOKS ((1 << NF_ARP_IN) | (1 << NF_ARP_OUT) | \
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(1 << NF_ARP_FORWARD))
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/* Standard entry. */
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struct arpt_standard
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{
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struct arpt_entry entry;
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struct arpt_standard_target target;
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};
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struct arpt_error_target
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{
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struct arpt_entry_target target;
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char errorname[ARPT_FUNCTION_MAXNAMELEN];
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};
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struct arpt_error
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{
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struct arpt_entry entry;
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struct arpt_error_target target;
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};
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static struct
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{
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struct arpt_replace repl;
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struct arpt_standard entries[3];
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struct arpt_error term;
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} initial_table __initdata
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= { { "filter", FILTER_VALID_HOOKS, 4,
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sizeof(struct arpt_standard) * 3 + sizeof(struct arpt_error),
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{ [NF_ARP_IN] = 0,
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[NF_ARP_OUT] = sizeof(struct arpt_standard),
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[NF_ARP_FORWARD] = 2 * sizeof(struct arpt_standard), },
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{ [NF_ARP_IN] = 0,
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[NF_ARP_OUT] = sizeof(struct arpt_standard),
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[NF_ARP_FORWARD] = 2 * sizeof(struct arpt_standard), },
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0, NULL, { } },
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{
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/* ARP_IN */
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{
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{
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{
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{ 0 }, { 0 }, { 0 }, { 0 },
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0, 0,
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{ { 0, }, { 0, } },
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{ { 0, }, { 0, } },
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0, 0,
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0, 0,
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0, 0,
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"", "", { 0 }, { 0 },
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0, 0
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},
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sizeof(struct arpt_entry),
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sizeof(struct arpt_standard),
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0,
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{ 0, 0 }, { } },
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{ { { { ARPT_ALIGN(sizeof(struct arpt_standard_target)), "" } }, { } },
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-NF_ACCEPT - 1 }
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},
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/* ARP_OUT */
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{
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{
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{
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{ 0 }, { 0 }, { 0 }, { 0 },
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0, 0,
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{ { 0, }, { 0, } },
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{ { 0, }, { 0, } },
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0, 0,
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0, 0,
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0, 0,
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"", "", { 0 }, { 0 },
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0, 0
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},
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sizeof(struct arpt_entry),
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sizeof(struct arpt_standard),
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0,
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{ 0, 0 }, { } },
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{ { { { ARPT_ALIGN(sizeof(struct arpt_standard_target)), "" } }, { } },
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-NF_ACCEPT - 1 }
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},
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/* ARP_FORWARD */
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{
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{
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{
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{ 0 }, { 0 }, { 0 }, { 0 },
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0, 0,
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{ { 0, }, { 0, } },
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{ { 0, }, { 0, } },
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0, 0,
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0, 0,
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0, 0,
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"", "", { 0 }, { 0 },
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0, 0
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},
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sizeof(struct arpt_entry),
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sizeof(struct arpt_standard),
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0,
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{ 0, 0 }, { } },
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{ { { { ARPT_ALIGN(sizeof(struct arpt_standard_target)), "" } }, { } },
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-NF_ACCEPT - 1 }
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}
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},
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/* ERROR */
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{
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{
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{
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{ 0 }, { 0 }, { 0 }, { 0 },
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0, 0,
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{ { 0, }, { 0, } },
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{ { 0, }, { 0, } },
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0, 0,
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0, 0,
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0, 0,
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"", "", { 0 }, { 0 },
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0, 0
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},
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sizeof(struct arpt_entry),
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sizeof(struct arpt_error),
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0,
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{ 0, 0 }, { } },
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{ { { { ARPT_ALIGN(sizeof(struct arpt_error_target)), ARPT_ERROR_TARGET } },
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{ } },
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"ERROR"
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}
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}
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};
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static struct arpt_table packet_filter = {
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.name = "filter",
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.valid_hooks = FILTER_VALID_HOOKS,
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.lock = RW_LOCK_UNLOCKED,
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.private = NULL,
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.me = THIS_MODULE,
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.af = NF_ARP,
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};
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/* The work comes in here from netfilter.c */
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static unsigned int arpt_hook(unsigned int hook,
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struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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return arpt_do_table(pskb, hook, in, out, &packet_filter, NULL);
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}
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static struct nf_hook_ops arpt_ops[] = {
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{
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.hook = arpt_hook,
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.owner = THIS_MODULE,
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.pf = NF_ARP,
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.hooknum = NF_ARP_IN,
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},
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{
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.hook = arpt_hook,
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.owner = THIS_MODULE,
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.pf = NF_ARP,
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.hooknum = NF_ARP_OUT,
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},
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{
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.hook = arpt_hook,
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.owner = THIS_MODULE,
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.pf = NF_ARP,
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.hooknum = NF_ARP_FORWARD,
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},
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};
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static int __init arptable_filter_init(void)
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{
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int ret;
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/* Register table */
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ret = arpt_register_table(&packet_filter, &initial_table.repl);
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if (ret < 0)
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return ret;
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ret = nf_register_hooks(arpt_ops, ARRAY_SIZE(arpt_ops));
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if (ret < 0)
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goto cleanup_table;
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return ret;
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cleanup_table:
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arpt_unregister_table(&packet_filter);
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return ret;
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}
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static void __exit arptable_filter_fini(void)
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{
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nf_unregister_hooks(arpt_ops, ARRAY_SIZE(arpt_ops));
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arpt_unregister_table(&packet_filter);
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}
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module_init(arptable_filter_init);
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module_exit(arptable_filter_fini);
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