| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 2 | /* |
| 3 | * ebt_pkttype |
| 4 | * |
| 5 | * Authors: |
| 6 | * Bart De Schuymer <bdschuym@pandora.be> |
| 7 | * |
| 8 | * April, 2003 |
| 9 | * |
| 10 | */ |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/netfilter/x_tables.h> |
| 13 | #include <linux/netfilter_bridge/ebtables.h> |
| 14 | #include <linux/netfilter_bridge/ebt_pkttype.h> |
| 15 | |
| 16 | static bool |
| 17 | ebt_pkttype_mt(const struct sk_buff *skb, struct xt_action_param *par) |
| 18 | { |
| 19 | const struct ebt_pkttype_info *info = par->matchinfo; |
| 20 | |
| 21 | return (skb->pkt_type == info->pkt_type) ^ info->invert; |
| 22 | } |
| 23 | |
| 24 | static int ebt_pkttype_mt_check(const struct xt_mtchk_param *par) |
| 25 | { |
| 26 | const struct ebt_pkttype_info *info = par->matchinfo; |
| 27 | |
| 28 | if (info->invert != 0 && info->invert != 1) |
| 29 | return -EINVAL; |
| 30 | /* Allow any pkt_type value */ |
| 31 | return 0; |
| 32 | } |
| 33 | |
| 34 | static struct xt_match ebt_pkttype_mt_reg __read_mostly = { |
| 35 | .name = "pkttype", |
| 36 | .revision = 0, |
| 37 | .family = NFPROTO_BRIDGE, |
| 38 | .match = ebt_pkttype_mt, |
| 39 | .checkentry = ebt_pkttype_mt_check, |
| 40 | .matchsize = sizeof(struct ebt_pkttype_info), |
| 41 | .me = THIS_MODULE, |
| 42 | }; |
| 43 | |
| 44 | static int __init ebt_pkttype_init(void) |
| 45 | { |
| 46 | return xt_register_match(target: &ebt_pkttype_mt_reg); |
| 47 | } |
| 48 | |
| 49 | static void __exit ebt_pkttype_fini(void) |
| 50 | { |
| 51 | xt_unregister_match(target: &ebt_pkttype_mt_reg); |
| 52 | } |
| 53 | |
| 54 | module_init(ebt_pkttype_init); |
| 55 | module_exit(ebt_pkttype_fini); |
| 56 | MODULE_DESCRIPTION("Ebtables: Link layer packet type match"); |
| 57 | MODULE_LICENSE("GPL"); |
| 58 |