projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 9291747f PM |
1 | /* |
| 2 | * Copyright (c) 2011 Patrick McHardy <kaber@trash.net> | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License version 2 as | |
| 6 | * published by the Free Software Foundation. | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/module.h> | |
| 10 | #include <linux/skbuff.h> | |
| 11 | #include <linux/netdevice.h> | |
| 12 | ||
| 13 | #include <linux/netfilter/xt_devgroup.h> | |
| 14 | #include <linux/netfilter/x_tables.h> | |
| 15 | ||
| 16 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
| 17 | MODULE_LICENSE("GPL"); | |
| 18 | MODULE_DESCRIPTION("Xtables: Device group match"); | |
| 19 | MODULE_ALIAS("ipt_devgroup"); | |
| 20 | MODULE_ALIAS("ip6t_devgroup"); | |
| 21 | ||
| 22 | static bool devgroup_mt(const struct sk_buff *skb, struct xt_action_param *par) | |
| 23 | { | |
| 24 | const struct xt_devgroup_info *info = par->matchinfo; | |
| 25 | ||
| 26 | if (info->flags & XT_DEVGROUP_MATCH_SRC && | |
| 613dbd95 | 27 | (((info->src_group ^ xt_in(par)->group) & info->src_mask ? 1 : 0) ^ |
| 9291747f PM |
28 | ((info->flags & XT_DEVGROUP_INVERT_SRC) ? 1 : 0))) |
| 29 | return false; | |
| 30 | ||
| 31 | if (info->flags & XT_DEVGROUP_MATCH_DST && | |
| 613dbd95 | 32 | (((info->dst_group ^ xt_out(par)->group) & info->dst_mask ? 1 : 0) ^ |
| 9291747f PM |
33 | ((info->flags & XT_DEVGROUP_INVERT_DST) ? 1 : 0))) |
| 34 | return false; | |
| 35 | ||
| 36 | return true; | |
| 37 | } | |
| 38 | ||
| 39 | static int devgroup_mt_checkentry(const struct xt_mtchk_param *par) | |
| 40 | { | |
| 41 | const struct xt_devgroup_info *info = par->matchinfo; | |
| 42 | ||
| 43 | if (info->flags & ~(XT_DEVGROUP_MATCH_SRC | XT_DEVGROUP_INVERT_SRC | | |
| 44 | XT_DEVGROUP_MATCH_DST | XT_DEVGROUP_INVERT_DST)) | |
| 45 | return -EINVAL; | |
| 46 | ||
| 47 | if (info->flags & XT_DEVGROUP_MATCH_SRC && | |
| 48 | par->hook_mask & ~((1 << NF_INET_PRE_ROUTING) | | |
| 49 | (1 << NF_INET_LOCAL_IN) | | |
| 50 | (1 << NF_INET_FORWARD))) | |
| 51 | return -EINVAL; | |
| 52 | ||
| 53 | if (info->flags & XT_DEVGROUP_MATCH_DST && | |
| 54 | par->hook_mask & ~((1 << NF_INET_FORWARD) | | |
| 55 | (1 << NF_INET_LOCAL_OUT) | | |
| 56 | (1 << NF_INET_POST_ROUTING))) | |
| 57 | return -EINVAL; | |
| 58 | ||
| 59 | return 0; | |
| 60 | } | |
| 61 | ||
| 62 | static struct xt_match devgroup_mt_reg __read_mostly = { | |
| 63 | .name = "devgroup", | |
| 64 | .match = devgroup_mt, | |
| 65 | .checkentry = devgroup_mt_checkentry, | |
| 66 | .matchsize = sizeof(struct xt_devgroup_info), | |
| 67 | .family = NFPROTO_UNSPEC, | |
| 68 | .me = THIS_MODULE | |
| 69 | }; | |
| 70 | ||
| 71 | static int __init devgroup_mt_init(void) | |
| 72 | { | |
| 73 | return xt_register_match(&devgroup_mt_reg); | |
| 74 | } | |
| 75 | ||
| 76 | static void __exit devgroup_mt_exit(void) | |
| 77 | { | |
| 78 | xt_unregister_match(&devgroup_mt_reg); | |
| 79 | } | |
| 80 | ||
| 81 | module_init(devgroup_mt_init); | |
| 82 | module_exit(devgroup_mt_exit); |