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Commit | Line | Data |
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1da177e4 LT |
1 | /* Kernel module to match the bridge port in and |
2 | * out device for IP packets coming into contact with a bridge. */ | |
3 | ||
4 | /* (C) 2001-2003 Bart De Schuymer <bdschuym@pandora.be> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
8bee4bad | 10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/skbuff.h> | |
deb47c66 | 13 | #include <linux/netfilter_bridge.h> |
2e4e6a17 HW |
14 | #include <linux/netfilter/xt_physdev.h> |
15 | #include <linux/netfilter/x_tables.h> | |
4b7fd5d9 | 16 | #include <net/netfilter/br_netfilter.h> |
1da177e4 LT |
17 | |
18 | MODULE_LICENSE("GPL"); | |
19 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); | |
2ae15b64 | 20 | MODULE_DESCRIPTION("Xtables: Bridge physical device match"); |
2e4e6a17 HW |
21 | MODULE_ALIAS("ipt_physdev"); |
22 | MODULE_ALIAS("ip6t_physdev"); | |
1da177e4 | 23 | |
eacc17fb | 24 | |
1d93a9cb | 25 | static bool |
62fc8051 | 26 | physdev_mt(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 27 | { |
f7108a20 | 28 | const struct xt_physdev_info *info = par->matchinfo; |
a99074ae | 29 | const struct net_device *physdev; |
4f1c3b7e | 30 | unsigned long ret; |
1da177e4 | 31 | const char *indev, *outdev; |
1da177e4 LT |
32 | |
33 | /* Not a bridged IP packet or no info available yet: | |
34 | * LOCAL_OUT/mangle and LOCAL_OUT/nat don't know if | |
35 | * the destination device will be a bridge. */ | |
a99074ae | 36 | if (!skb->nf_bridge) { |
1da177e4 | 37 | /* Return MATCH if the invert flags of the used options are on */ |
2e4e6a17 HW |
38 | if ((info->bitmask & XT_PHYSDEV_OP_BRIDGED) && |
39 | !(info->invert & XT_PHYSDEV_OP_BRIDGED)) | |
1d93a9cb | 40 | return false; |
2e4e6a17 HW |
41 | if ((info->bitmask & XT_PHYSDEV_OP_ISIN) && |
42 | !(info->invert & XT_PHYSDEV_OP_ISIN)) | |
1d93a9cb | 43 | return false; |
2e4e6a17 HW |
44 | if ((info->bitmask & XT_PHYSDEV_OP_ISOUT) && |
45 | !(info->invert & XT_PHYSDEV_OP_ISOUT)) | |
1d93a9cb | 46 | return false; |
2e4e6a17 HW |
47 | if ((info->bitmask & XT_PHYSDEV_OP_IN) && |
48 | !(info->invert & XT_PHYSDEV_OP_IN)) | |
1d93a9cb | 49 | return false; |
2e4e6a17 HW |
50 | if ((info->bitmask & XT_PHYSDEV_OP_OUT) && |
51 | !(info->invert & XT_PHYSDEV_OP_OUT)) | |
1d93a9cb JE |
52 | return false; |
53 | return true; | |
1da177e4 LT |
54 | } |
55 | ||
a99074ae FW |
56 | physdev = nf_bridge_get_physoutdev(skb); |
57 | outdev = physdev ? physdev->name : NULL; | |
58 | ||
1da177e4 | 59 | /* This only makes sense in the FORWARD and POSTROUTING chains */ |
2e4e6a17 | 60 | if ((info->bitmask & XT_PHYSDEV_OP_BRIDGED) && |
a99074ae | 61 | (!!outdev ^ !(info->invert & XT_PHYSDEV_OP_BRIDGED))) |
1d93a9cb | 62 | return false; |
1da177e4 | 63 | |
a99074ae FW |
64 | physdev = nf_bridge_get_physindev(skb); |
65 | indev = physdev ? physdev->name : NULL; | |
66 | ||
2e4e6a17 | 67 | if ((info->bitmask & XT_PHYSDEV_OP_ISIN && |
a99074ae | 68 | (!indev ^ !!(info->invert & XT_PHYSDEV_OP_ISIN))) || |
2e4e6a17 | 69 | (info->bitmask & XT_PHYSDEV_OP_ISOUT && |
a99074ae | 70 | (!outdev ^ !!(info->invert & XT_PHYSDEV_OP_ISOUT)))) |
1d93a9cb | 71 | return false; |
1da177e4 | 72 | |
2e4e6a17 | 73 | if (!(info->bitmask & XT_PHYSDEV_OP_IN)) |
1da177e4 | 74 | goto match_outdev; |
1da177e4 | 75 | |
a99074ae FW |
76 | if (indev) { |
77 | ret = ifname_compare_aligned(indev, info->physindev, | |
78 | info->in_mask); | |
79 | ||
80 | if (!ret ^ !(info->invert & XT_PHYSDEV_OP_IN)) | |
81 | return false; | |
82 | } | |
1da177e4 LT |
83 | |
84 | match_outdev: | |
2e4e6a17 | 85 | if (!(info->bitmask & XT_PHYSDEV_OP_OUT)) |
1d93a9cb | 86 | return true; |
a99074ae FW |
87 | |
88 | if (!outdev) | |
89 | return false; | |
90 | ||
b8dfe498 | 91 | ret = ifname_compare_aligned(outdev, info->physoutdev, info->out_mask); |
eacc17fb | 92 | |
4f1c3b7e | 93 | return (!!ret ^ !(info->invert & XT_PHYSDEV_OP_OUT)); |
1da177e4 LT |
94 | } |
95 | ||
b0f38452 | 96 | static int physdev_mt_check(const struct xt_mtchk_param *par) |
1da177e4 | 97 | { |
9b4fce7a | 98 | const struct xt_physdev_info *info = par->matchinfo; |
1da177e4 | 99 | |
4b7fd5d9 PNA |
100 | br_netfilter_enable(); |
101 | ||
2e4e6a17 HW |
102 | if (!(info->bitmask & XT_PHYSDEV_OP_MASK) || |
103 | info->bitmask & ~XT_PHYSDEV_OP_MASK) | |
bd414ee6 | 104 | return -EINVAL; |
47c74456 | 105 | if (info->bitmask & (XT_PHYSDEV_OP_OUT | XT_PHYSDEV_OP_ISOUT) && |
10ea6ac8 PM |
106 | (!(info->bitmask & XT_PHYSDEV_OP_BRIDGED) || |
107 | info->invert & XT_PHYSDEV_OP_BRIDGED) && | |
9b4fce7a JE |
108 | par->hook_mask & ((1 << NF_INET_LOCAL_OUT) | |
109 | (1 << NF_INET_FORWARD) | (1 << NF_INET_POST_ROUTING))) { | |
ceee4091 HL |
110 | pr_info("using --physdev-out and --physdev-is-out are only " |
111 | "supported in the FORWARD and POSTROUTING chains with " | |
47c74456 | 112 | "bridged traffic.\n"); |
9b4fce7a | 113 | if (par->hook_mask & (1 << NF_INET_LOCAL_OUT)) |
bd414ee6 | 114 | return -EINVAL; |
10ea6ac8 | 115 | } |
bd414ee6 | 116 | return 0; |
1da177e4 LT |
117 | } |
118 | ||
ab4f21e6 JE |
119 | static struct xt_match physdev_mt_reg __read_mostly = { |
120 | .name = "physdev", | |
121 | .revision = 0, | |
122 | .family = NFPROTO_UNSPEC, | |
123 | .checkentry = physdev_mt_check, | |
124 | .match = physdev_mt, | |
125 | .matchsize = sizeof(struct xt_physdev_info), | |
126 | .me = THIS_MODULE, | |
1da177e4 LT |
127 | }; |
128 | ||
d3c5ee6d | 129 | static int __init physdev_mt_init(void) |
1da177e4 | 130 | { |
ab4f21e6 | 131 | return xt_register_match(&physdev_mt_reg); |
1da177e4 LT |
132 | } |
133 | ||
d3c5ee6d | 134 | static void __exit physdev_mt_exit(void) |
1da177e4 | 135 | { |
ab4f21e6 | 136 | xt_unregister_match(&physdev_mt_reg); |
1da177e4 LT |
137 | } |
138 | ||
d3c5ee6d JE |
139 | module_init(physdev_mt_init); |
140 | module_exit(physdev_mt_exit); |