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1 | /* Kernel module to match ESP parameters. */ |
2 | |
3 | /* (C) 1999-2000 Yon Uriarte <yon@astaro.de> |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License version 2 as |
7 | * published by the Free Software Foundation. |
8 | */ |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
10 | #include <linux/module.h> |
11 | #include <linux/skbuff.h> |
12 | #include <linux/in.h> |
13 | #include <linux/ip.h> |
14 | |
15 | #include <linux/netfilter/xt_esp.h> |
16 | #include <linux/netfilter/x_tables.h> |
17 | |
18 | #include <linux/netfilter_ipv4/ip_tables.h> |
19 | #include <linux/netfilter_ipv6/ip6_tables.h> |
20 | |
21 | MODULE_LICENSE("GPL"); |
22 | MODULE_AUTHOR("Yon Uriarte <yon@astaro.de>"); |
23 | MODULE_DESCRIPTION("Xtables: IPsec-ESP packet match"); |
24 | MODULE_ALIAS("ipt_esp"); |
25 | MODULE_ALIAS("ip6t_esp"); |
26 | |
27 | /* Returns 1 if the spi is matched by the range, 0 otherwise */ |
28 | static inline bool |
29 | spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, bool invert) |
30 | { |
31 | bool r; |
32 | pr_debug("spi_match:%c 0x%x <= 0x%x <= 0x%x\n", |
33 | invert ? '!' : ' ', min, spi, max); |
34 | r = (spi >= min && spi <= max) ^ invert; |
35 | pr_debug(" result %s\n", r ? "PASS" : "FAILED"); |
36 | return r; |
37 | } |
38 | |
39 | static bool esp_mt(const struct sk_buff *skb, struct xt_action_param *par) |
40 | { |
41 | const struct ip_esp_hdr *eh; |
42 | struct ip_esp_hdr _esp; |
43 | const struct xt_esp *espinfo = par->matchinfo; |
44 | |
45 | /* Must not be a fragment. */ |
46 | if (par->fragoff != 0) |
47 | return false; |
48 | |
49 | eh = skb_header_pointer(skb, par->thoff, sizeof(_esp), &_esp); |
50 | if (eh == NULL) { |
51 | /* We've been asked to examine this packet, and we |
52 | * can't. Hence, no choice but to drop. |
53 | */ |
54 | pr_debug("Dropping evil ESP tinygram.\n"); |
55 | par->hotdrop = true; |
56 | return false; |
57 | } |
58 | |
59 | return spi_match(espinfo->spis[0], espinfo->spis[1], ntohl(eh->spi), |
60 | !!(espinfo->invflags & XT_ESP_INV_SPI)); |
61 | } |
62 | |
63 | static int esp_mt_check(const struct xt_mtchk_param *par) |
64 | { |
65 | const struct xt_esp *espinfo = par->matchinfo; |
66 | |
67 | if (espinfo->invflags & ~XT_ESP_INV_MASK) { |
68 | pr_debug("unknown flags %X\n", espinfo->invflags); |
69 | return -EINVAL; |
70 | } |
71 | |
72 | return 0; |
73 | } |
74 | |
75 | static struct xt_match esp_mt_reg[] __read_mostly = { |
76 | { |
77 | .name = "esp", |
78 | .family = NFPROTO_IPV4, |
79 | .checkentry = esp_mt_check, |
80 | .match = esp_mt, |
81 | .matchsize = sizeof(struct xt_esp), |
82 | .proto = IPPROTO_ESP, |
83 | .me = THIS_MODULE, |
84 | }, |
85 | { |
86 | .name = "esp", |
87 | .family = NFPROTO_IPV6, |
88 | .checkentry = esp_mt_check, |
89 | .match = esp_mt, |
90 | .matchsize = sizeof(struct xt_esp), |
91 | .proto = IPPROTO_ESP, |
92 | .me = THIS_MODULE, |
93 | }, |
94 | }; |
95 | |
96 | static int __init esp_mt_init(void) |
97 | { |
98 | return xt_register_matches(esp_mt_reg, ARRAY_SIZE(esp_mt_reg)); |
99 | } |
100 | |
101 | static void __exit esp_mt_exit(void) |
102 | { |
103 | xt_unregister_matches(esp_mt_reg, ARRAY_SIZE(esp_mt_reg)); |
104 | } |
105 | |
106 | module_init(esp_mt_init); |
107 | module_exit(esp_mt_exit); |
108 |
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