Commit | Line | Data |
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ba4e58ec GR |
1 | /* Kernel module to match one of a list of TCP/UDP(-Lite)/SCTP/DCCP ports: |
2 | ports are in the same place so we can treat them as equal. */ | |
a89ecb6a YK |
3 | |
4 | /* (C) 1999-2001 Paul `Rusty' Russell | |
5 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/udp.h> | |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/in.h> | |
17 | ||
18 | #include <linux/netfilter/xt_multiport.h> | |
19 | #include <linux/netfilter/x_tables.h> | |
20 | #include <linux/netfilter_ipv4/ip_tables.h> | |
21 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
22 | ||
23 | MODULE_LICENSE("GPL"); | |
24 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
2ae15b64 | 25 | MODULE_DESCRIPTION("Xtables: multiple port matching for TCP, UDP, UDP-Lite, SCTP and DCCP"); |
a89ecb6a YK |
26 | MODULE_ALIAS("ipt_multiport"); |
27 | MODULE_ALIAS("ip6t_multiport"); | |
28 | ||
29 | #if 0 | |
30 | #define duprintf(format, args...) printk(format , ## args) | |
31 | #else | |
32 | #define duprintf(format, args...) | |
33 | #endif | |
34 | ||
35 | /* Returns 1 if the port is matched by the test, 0 otherwise. */ | |
1d93a9cb | 36 | static inline bool |
d3c5ee6d JE |
37 | ports_match_v0(const u_int16_t *portlist, enum xt_multiport_flags flags, |
38 | u_int8_t count, u_int16_t src, u_int16_t dst) | |
a89ecb6a YK |
39 | { |
40 | unsigned int i; | |
41 | for (i = 0; i < count; i++) { | |
42 | if (flags != XT_MULTIPORT_DESTINATION && portlist[i] == src) | |
1d93a9cb | 43 | return true; |
a89ecb6a YK |
44 | |
45 | if (flags != XT_MULTIPORT_SOURCE && portlist[i] == dst) | |
1d93a9cb | 46 | return true; |
a89ecb6a YK |
47 | } |
48 | ||
1d93a9cb | 49 | return false; |
a89ecb6a YK |
50 | } |
51 | ||
52 | /* Returns 1 if the port is matched by the test, 0 otherwise. */ | |
1d93a9cb | 53 | static inline bool |
a89ecb6a YK |
54 | ports_match_v1(const struct xt_multiport_v1 *minfo, |
55 | u_int16_t src, u_int16_t dst) | |
56 | { | |
57 | unsigned int i; | |
58 | u_int16_t s, e; | |
59 | ||
60 | for (i = 0; i < minfo->count; i++) { | |
61 | s = minfo->ports[i]; | |
62 | ||
63 | if (minfo->pflags[i]) { | |
64 | /* range port matching */ | |
65 | e = minfo->ports[++i]; | |
66 | duprintf("src or dst matches with %d-%d?\n", s, e); | |
67 | ||
68 | if (minfo->flags == XT_MULTIPORT_SOURCE | |
69 | && src >= s && src <= e) | |
1d93a9cb | 70 | return true ^ minfo->invert; |
a89ecb6a YK |
71 | if (minfo->flags == XT_MULTIPORT_DESTINATION |
72 | && dst >= s && dst <= e) | |
1d93a9cb | 73 | return true ^ minfo->invert; |
a89ecb6a YK |
74 | if (minfo->flags == XT_MULTIPORT_EITHER |
75 | && ((dst >= s && dst <= e) | |
76 | || (src >= s && src <= e))) | |
1d93a9cb | 77 | return true ^ minfo->invert; |
a89ecb6a YK |
78 | } else { |
79 | /* exact port matching */ | |
80 | duprintf("src or dst matches with %d?\n", s); | |
81 | ||
82 | if (minfo->flags == XT_MULTIPORT_SOURCE | |
83 | && src == s) | |
1d93a9cb | 84 | return true ^ minfo->invert; |
a89ecb6a YK |
85 | if (minfo->flags == XT_MULTIPORT_DESTINATION |
86 | && dst == s) | |
1d93a9cb | 87 | return true ^ minfo->invert; |
a89ecb6a YK |
88 | if (minfo->flags == XT_MULTIPORT_EITHER |
89 | && (src == s || dst == s)) | |
1d93a9cb | 90 | return true ^ minfo->invert; |
a89ecb6a YK |
91 | } |
92 | } | |
93 | ||
601e68e1 | 94 | return minfo->invert; |
a89ecb6a YK |
95 | } |
96 | ||
1d93a9cb | 97 | static bool |
f7108a20 | 98 | multiport_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par) |
a89ecb6a | 99 | { |
3cf93c96 JE |
100 | const __be16 *pptr; |
101 | __be16 _ports[2]; | |
f7108a20 | 102 | const struct xt_multiport *multiinfo = par->matchinfo; |
a89ecb6a | 103 | |
f7108a20 | 104 | if (par->fragoff != 0) |
1d93a9cb | 105 | return false; |
a89ecb6a | 106 | |
f7108a20 | 107 | pptr = skb_header_pointer(skb, par->thoff, sizeof(_ports), _ports); |
a89ecb6a YK |
108 | if (pptr == NULL) { |
109 | /* We've been asked to examine this packet, and we | |
110 | * can't. Hence, no choice but to drop. | |
111 | */ | |
112 | duprintf("xt_multiport: Dropping evil offset=0 tinygram.\n"); | |
f7108a20 | 113 | *par->hotdrop = true; |
1d93a9cb | 114 | return false; |
a89ecb6a YK |
115 | } |
116 | ||
d3c5ee6d JE |
117 | return ports_match_v0(multiinfo->ports, multiinfo->flags, |
118 | multiinfo->count, ntohs(pptr[0]), ntohs(pptr[1])); | |
a89ecb6a YK |
119 | } |
120 | ||
1d93a9cb | 121 | static bool |
f7108a20 | 122 | multiport_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
a89ecb6a | 123 | { |
3cf93c96 JE |
124 | const __be16 *pptr; |
125 | __be16 _ports[2]; | |
f7108a20 | 126 | const struct xt_multiport_v1 *multiinfo = par->matchinfo; |
a89ecb6a | 127 | |
f7108a20 | 128 | if (par->fragoff != 0) |
1d93a9cb | 129 | return false; |
a89ecb6a | 130 | |
f7108a20 | 131 | pptr = skb_header_pointer(skb, par->thoff, sizeof(_ports), _ports); |
a89ecb6a YK |
132 | if (pptr == NULL) { |
133 | /* We've been asked to examine this packet, and we | |
134 | * can't. Hence, no choice but to drop. | |
135 | */ | |
136 | duprintf("xt_multiport: Dropping evil offset=0 tinygram.\n"); | |
f7108a20 | 137 | *par->hotdrop = true; |
1d93a9cb | 138 | return false; |
a89ecb6a YK |
139 | } |
140 | ||
141 | return ports_match_v1(multiinfo, ntohs(pptr[0]), ntohs(pptr[1])); | |
142 | } | |
143 | ||
ccb79bdc | 144 | static inline bool |
a89ecb6a YK |
145 | check(u_int16_t proto, |
146 | u_int8_t ip_invflags, | |
147 | u_int8_t match_flags, | |
148 | u_int8_t count) | |
149 | { | |
957dc80a PM |
150 | /* Must specify supported protocol, no unknown flags or bad count */ |
151 | return (proto == IPPROTO_TCP || proto == IPPROTO_UDP | |
ba4e58ec | 152 | || proto == IPPROTO_UDPLITE |
957dc80a | 153 | || proto == IPPROTO_SCTP || proto == IPPROTO_DCCP) |
a89ecb6a YK |
154 | && !(ip_invflags & XT_INV_PROTO) |
155 | && (match_flags == XT_MULTIPORT_SOURCE | |
156 | || match_flags == XT_MULTIPORT_DESTINATION | |
157 | || match_flags == XT_MULTIPORT_EITHER) | |
158 | && count <= XT_MULTI_PORTS; | |
159 | } | |
160 | ||
9b4fce7a | 161 | static bool multiport_mt_check_v0(const struct xt_mtchk_param *par) |
a89ecb6a | 162 | { |
9b4fce7a JE |
163 | const struct ipt_ip *ip = par->entryinfo; |
164 | const struct xt_multiport *multiinfo = par->matchinfo; | |
a89ecb6a YK |
165 | |
166 | return check(ip->proto, ip->invflags, multiinfo->flags, | |
167 | multiinfo->count); | |
168 | } | |
169 | ||
9b4fce7a | 170 | static bool multiport_mt_check(const struct xt_mtchk_param *par) |
a89ecb6a | 171 | { |
9b4fce7a JE |
172 | const struct ipt_ip *ip = par->entryinfo; |
173 | const struct xt_multiport_v1 *multiinfo = par->matchinfo; | |
a89ecb6a YK |
174 | |
175 | return check(ip->proto, ip->invflags, multiinfo->flags, | |
176 | multiinfo->count); | |
177 | } | |
178 | ||
9b4fce7a | 179 | static bool multiport_mt6_check_v0(const struct xt_mtchk_param *par) |
a89ecb6a | 180 | { |
9b4fce7a JE |
181 | const struct ip6t_ip6 *ip = par->entryinfo; |
182 | const struct xt_multiport *multiinfo = par->matchinfo; | |
a89ecb6a YK |
183 | |
184 | return check(ip->proto, ip->invflags, multiinfo->flags, | |
185 | multiinfo->count); | |
186 | } | |
187 | ||
9b4fce7a | 188 | static bool multiport_mt6_check(const struct xt_mtchk_param *par) |
a89ecb6a | 189 | { |
9b4fce7a JE |
190 | const struct ip6t_ip6 *ip = par->entryinfo; |
191 | const struct xt_multiport_v1 *multiinfo = par->matchinfo; | |
a89ecb6a YK |
192 | |
193 | return check(ip->proto, ip->invflags, multiinfo->flags, | |
194 | multiinfo->count); | |
195 | } | |
196 | ||
d3c5ee6d | 197 | static struct xt_match multiport_mt_reg[] __read_mostly = { |
4470bbc7 PM |
198 | { |
199 | .name = "multiport", | |
ee999d8b | 200 | .family = NFPROTO_IPV4, |
4470bbc7 | 201 | .revision = 0, |
d3c5ee6d JE |
202 | .checkentry = multiport_mt_check_v0, |
203 | .match = multiport_mt_v0, | |
4470bbc7 PM |
204 | .matchsize = sizeof(struct xt_multiport), |
205 | .me = THIS_MODULE, | |
206 | }, | |
207 | { | |
208 | .name = "multiport", | |
ee999d8b | 209 | .family = NFPROTO_IPV4, |
4470bbc7 | 210 | .revision = 1, |
d3c5ee6d JE |
211 | .checkentry = multiport_mt_check, |
212 | .match = multiport_mt, | |
4470bbc7 PM |
213 | .matchsize = sizeof(struct xt_multiport_v1), |
214 | .me = THIS_MODULE, | |
215 | }, | |
216 | { | |
217 | .name = "multiport", | |
ee999d8b | 218 | .family = NFPROTO_IPV6, |
4470bbc7 | 219 | .revision = 0, |
d3c5ee6d JE |
220 | .checkentry = multiport_mt6_check_v0, |
221 | .match = multiport_mt_v0, | |
4470bbc7 PM |
222 | .matchsize = sizeof(struct xt_multiport), |
223 | .me = THIS_MODULE, | |
224 | }, | |
225 | { | |
226 | .name = "multiport", | |
ee999d8b | 227 | .family = NFPROTO_IPV6, |
4470bbc7 | 228 | .revision = 1, |
d3c5ee6d JE |
229 | .checkentry = multiport_mt6_check, |
230 | .match = multiport_mt, | |
4470bbc7 PM |
231 | .matchsize = sizeof(struct xt_multiport_v1), |
232 | .me = THIS_MODULE, | |
233 | }, | |
a89ecb6a YK |
234 | }; |
235 | ||
d3c5ee6d | 236 | static int __init multiport_mt_init(void) |
a89ecb6a | 237 | { |
d3c5ee6d JE |
238 | return xt_register_matches(multiport_mt_reg, |
239 | ARRAY_SIZE(multiport_mt_reg)); | |
a89ecb6a YK |
240 | } |
241 | ||
d3c5ee6d | 242 | static void __exit multiport_mt_exit(void) |
a89ecb6a | 243 | { |
d3c5ee6d | 244 | xt_unregister_matches(multiport_mt_reg, ARRAY_SIZE(multiport_mt_reg)); |
a89ecb6a YK |
245 | } |
246 | ||
d3c5ee6d JE |
247 | module_init(multiport_mt_init); |
248 | module_exit(multiport_mt_exit); |