projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| a0ca215a MN |
1 | /* |
| 2 | * Copyright (C)2006 USAGI/WIDE Project | |
| 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 | * Author: | |
| 9 | * Masahide NAKAMURA @USAGI <masahide.nakamura.cz@hitachi.com> | |
| 10 | * | |
| 11 | * Based on net/netfilter/xt_tcpudp.c | |
| 12 | * | |
| 13 | */ | |
| be91fd5e | 14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| a0ca215a MN |
15 | #include <linux/types.h> |
| 16 | #include <linux/module.h> | |
| 17 | #include <net/ip.h> | |
| 18 | #include <linux/ipv6.h> | |
| 19 | #include <net/ipv6.h> | |
| 20 | #include <net/mip6.h> | |
| 21 | ||
| 22 | #include <linux/netfilter/x_tables.h> | |
| 23 | #include <linux/netfilter_ipv6/ip6t_mh.h> | |
| 24 | ||
| 2ae15b64 | 25 | MODULE_DESCRIPTION("Xtables: IPv6 Mobility Header match"); |
| a0ca215a MN |
26 | MODULE_LICENSE("GPL"); |
| 27 | ||
| a0ca215a | 28 | /* Returns 1 if the type is matched by the range, 0 otherwise */ |
| 1d93a9cb JE |
29 | static inline bool |
| 30 | type_match(u_int8_t min, u_int8_t max, u_int8_t type, bool invert) | |
| a0ca215a | 31 | { |
| 1d93a9cb | 32 | return (type >= min && type <= max) ^ invert; |
| a0ca215a MN |
33 | } |
| 34 | ||
| 62fc8051 | 35 | static bool mh_mt6(const struct sk_buff *skb, struct xt_action_param *par) |
| a0ca215a | 36 | { |
| a47362a2 JE |
37 | struct ip6_mh _mh; |
| 38 | const struct ip6_mh *mh; | |
| f7108a20 | 39 | const struct ip6t_mh *mhinfo = par->matchinfo; |
| a0ca215a MN |
40 | |
| 41 | /* Must not be a fragment. */ | |
| f7108a20 | 42 | if (par->fragoff != 0) |
| 1d93a9cb | 43 | return false; |
| a0ca215a | 44 | |
| f7108a20 | 45 | mh = skb_header_pointer(skb, par->thoff, sizeof(_mh), &_mh); |
| a0ca215a MN |
46 | if (mh == NULL) { |
| 47 | /* We've been asked to examine this packet, and we | |
| 48 | can't. Hence, no choice but to drop. */ | |
| be91fd5e | 49 | pr_debug("Dropping evil MH tinygram.\n"); |
| b4ba2611 | 50 | par->hotdrop = true; |
| 1d93a9cb | 51 | return false; |
| a0ca215a MN |
52 | } |
| 53 | ||
| 138939e0 | 54 | if (mh->ip6mh_proto != IPPROTO_NONE) { |
| be91fd5e | 55 | pr_debug("Dropping invalid MH Payload Proto: %u\n", |
| 138939e0 | 56 | mh->ip6mh_proto); |
| b4ba2611 | 57 | par->hotdrop = true; |
| 1d93a9cb | 58 | return false; |
| 138939e0 MN |
59 | } |
| 60 | ||
| a0ca215a MN |
61 | return type_match(mhinfo->types[0], mhinfo->types[1], mh->ip6mh_type, |
| 62 | !!(mhinfo->invflags & IP6T_MH_INV_TYPE)); | |
| 63 | } | |
| 64 | ||
| b0f38452 | 65 | static int mh_mt6_check(const struct xt_mtchk_param *par) |
| a0ca215a | 66 | { |
| 9b4fce7a | 67 | const struct ip6t_mh *mhinfo = par->matchinfo; |
| a0ca215a MN |
68 | |
| 69 | /* Must specify no unknown invflags */ | |
| bd414ee6 | 70 | return (mhinfo->invflags & ~IP6T_MH_INV_MASK) ? -EINVAL : 0; |
| a0ca215a MN |
71 | } |
| 72 | ||
| d3c5ee6d | 73 | static struct xt_match mh_mt6_reg __read_mostly = { |
| a0ca215a | 74 | .name = "mh", |
| ee999d8b | 75 | .family = NFPROTO_IPV6, |
| d3c5ee6d JE |
76 | .checkentry = mh_mt6_check, |
| 77 | .match = mh_mt6, | |
| a0ca215a MN |
78 | .matchsize = sizeof(struct ip6t_mh), |
| 79 | .proto = IPPROTO_MH, | |
| 80 | .me = THIS_MODULE, | |
| 81 | }; | |
| 82 | ||
| d3c5ee6d | 83 | static int __init mh_mt6_init(void) |
| a0ca215a | 84 | { |
| d3c5ee6d | 85 | return xt_register_match(&mh_mt6_reg); |
| a0ca215a MN |
86 | } |
| 87 | ||
| d3c5ee6d | 88 | static void __exit mh_mt6_exit(void) |
| a0ca215a | 89 | { |
| d3c5ee6d | 90 | xt_unregister_match(&mh_mt6_reg); |
| a0ca215a MN |
91 | } |
| 92 | ||
| d3c5ee6d JE |
93 | module_init(mh_mt6_init); |
| 94 | module_exit(mh_mt6_exit); |