Root/
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 | */ |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | #include <linux/module.h> |
12 | #include <linux/skbuff.h> |
13 | #include <linux/netfilter_bridge.h> |
14 | #include <linux/netfilter/xt_physdev.h> |
15 | #include <linux/netfilter/x_tables.h> |
16 | |
17 | MODULE_LICENSE("GPL"); |
18 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); |
19 | MODULE_DESCRIPTION("Xtables: Bridge physical device match"); |
20 | MODULE_ALIAS("ipt_physdev"); |
21 | MODULE_ALIAS("ip6t_physdev"); |
22 | |
23 | |
24 | static bool |
25 | physdev_mt(const struct sk_buff *skb, struct xt_action_param *par) |
26 | { |
27 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
28 | const struct xt_physdev_info *info = par->matchinfo; |
29 | unsigned long ret; |
30 | const char *indev, *outdev; |
31 | const struct nf_bridge_info *nf_bridge; |
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. */ |
36 | if (!(nf_bridge = skb->nf_bridge)) { |
37 | /* Return MATCH if the invert flags of the used options are on */ |
38 | if ((info->bitmask & XT_PHYSDEV_OP_BRIDGED) && |
39 | !(info->invert & XT_PHYSDEV_OP_BRIDGED)) |
40 | return false; |
41 | if ((info->bitmask & XT_PHYSDEV_OP_ISIN) && |
42 | !(info->invert & XT_PHYSDEV_OP_ISIN)) |
43 | return false; |
44 | if ((info->bitmask & XT_PHYSDEV_OP_ISOUT) && |
45 | !(info->invert & XT_PHYSDEV_OP_ISOUT)) |
46 | return false; |
47 | if ((info->bitmask & XT_PHYSDEV_OP_IN) && |
48 | !(info->invert & XT_PHYSDEV_OP_IN)) |
49 | return false; |
50 | if ((info->bitmask & XT_PHYSDEV_OP_OUT) && |
51 | !(info->invert & XT_PHYSDEV_OP_OUT)) |
52 | return false; |
53 | return true; |
54 | } |
55 | |
56 | /* This only makes sense in the FORWARD and POSTROUTING chains */ |
57 | if ((info->bitmask & XT_PHYSDEV_OP_BRIDGED) && |
58 | (!!(nf_bridge->mask & BRNF_BRIDGED) ^ |
59 | !(info->invert & XT_PHYSDEV_OP_BRIDGED))) |
60 | return false; |
61 | |
62 | if ((info->bitmask & XT_PHYSDEV_OP_ISIN && |
63 | (!nf_bridge->physindev ^ !!(info->invert & XT_PHYSDEV_OP_ISIN))) || |
64 | (info->bitmask & XT_PHYSDEV_OP_ISOUT && |
65 | (!nf_bridge->physoutdev ^ !!(info->invert & XT_PHYSDEV_OP_ISOUT)))) |
66 | return false; |
67 | |
68 | if (!(info->bitmask & XT_PHYSDEV_OP_IN)) |
69 | goto match_outdev; |
70 | indev = nf_bridge->physindev ? nf_bridge->physindev->name : nulldevname; |
71 | ret = ifname_compare_aligned(indev, info->physindev, info->in_mask); |
72 | |
73 | if (!ret ^ !(info->invert & XT_PHYSDEV_OP_IN)) |
74 | return false; |
75 | |
76 | match_outdev: |
77 | if (!(info->bitmask & XT_PHYSDEV_OP_OUT)) |
78 | return true; |
79 | outdev = nf_bridge->physoutdev ? |
80 | nf_bridge->physoutdev->name : nulldevname; |
81 | ret = ifname_compare_aligned(outdev, info->physoutdev, info->out_mask); |
82 | |
83 | return (!!ret ^ !(info->invert & XT_PHYSDEV_OP_OUT)); |
84 | } |
85 | |
86 | static int physdev_mt_check(const struct xt_mtchk_param *par) |
87 | { |
88 | const struct xt_physdev_info *info = par->matchinfo; |
89 | |
90 | if (!(info->bitmask & XT_PHYSDEV_OP_MASK) || |
91 | info->bitmask & ~XT_PHYSDEV_OP_MASK) |
92 | return -EINVAL; |
93 | if (info->bitmask & XT_PHYSDEV_OP_OUT && |
94 | (!(info->bitmask & XT_PHYSDEV_OP_BRIDGED) || |
95 | info->invert & XT_PHYSDEV_OP_BRIDGED) && |
96 | par->hook_mask & ((1 << NF_INET_LOCAL_OUT) | |
97 | (1 << NF_INET_FORWARD) | (1 << NF_INET_POST_ROUTING))) { |
98 | pr_info("using --physdev-out in the OUTPUT, FORWARD and " |
99 | "POSTROUTING chains for non-bridged traffic is not " |
100 | "supported anymore.\n"); |
101 | if (par->hook_mask & (1 << NF_INET_LOCAL_OUT)) |
102 | return -EINVAL; |
103 | } |
104 | return 0; |
105 | } |
106 | |
107 | static struct xt_match physdev_mt_reg __read_mostly = { |
108 | .name = "physdev", |
109 | .revision = 0, |
110 | .family = NFPROTO_UNSPEC, |
111 | .checkentry = physdev_mt_check, |
112 | .match = physdev_mt, |
113 | .matchsize = sizeof(struct xt_physdev_info), |
114 | .me = THIS_MODULE, |
115 | }; |
116 | |
117 | static int __init physdev_mt_init(void) |
118 | { |
119 | return xt_register_match(&physdev_mt_reg); |
120 | } |
121 | |
122 | static void __exit physdev_mt_exit(void) |
123 | { |
124 | xt_unregister_match(&physdev_mt_reg); |
125 | } |
126 | |
127 | module_init(physdev_mt_init); |
128 | module_exit(physdev_mt_exit); |
129 |
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