Root/
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. */ |
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 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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>"); |
25 | MODULE_DESCRIPTION("Xtables: multiple port matching for TCP, UDP, UDP-Lite, SCTP and DCCP"); |
26 | MODULE_ALIAS("ipt_multiport"); |
27 | MODULE_ALIAS("ip6t_multiport"); |
28 | |
29 | /* Returns 1 if the port is matched by the test, 0 otherwise. */ |
30 | static inline bool |
31 | ports_match_v1(const struct xt_multiport_v1 *minfo, |
32 | u_int16_t src, u_int16_t dst) |
33 | { |
34 | unsigned int i; |
35 | u_int16_t s, e; |
36 | |
37 | for (i = 0; i < minfo->count; i++) { |
38 | s = minfo->ports[i]; |
39 | |
40 | if (minfo->pflags[i]) { |
41 | /* range port matching */ |
42 | e = minfo->ports[++i]; |
43 | pr_debug("src or dst matches with %d-%d?\n", s, e); |
44 | |
45 | if (minfo->flags == XT_MULTIPORT_SOURCE |
46 | && src >= s && src <= e) |
47 | return true ^ minfo->invert; |
48 | if (minfo->flags == XT_MULTIPORT_DESTINATION |
49 | && dst >= s && dst <= e) |
50 | return true ^ minfo->invert; |
51 | if (minfo->flags == XT_MULTIPORT_EITHER |
52 | && ((dst >= s && dst <= e) |
53 | || (src >= s && src <= e))) |
54 | return true ^ minfo->invert; |
55 | } else { |
56 | /* exact port matching */ |
57 | pr_debug("src or dst matches with %d?\n", s); |
58 | |
59 | if (minfo->flags == XT_MULTIPORT_SOURCE |
60 | && src == s) |
61 | return true ^ minfo->invert; |
62 | if (minfo->flags == XT_MULTIPORT_DESTINATION |
63 | && dst == s) |
64 | return true ^ minfo->invert; |
65 | if (minfo->flags == XT_MULTIPORT_EITHER |
66 | && (src == s || dst == s)) |
67 | return true ^ minfo->invert; |
68 | } |
69 | } |
70 | |
71 | return minfo->invert; |
72 | } |
73 | |
74 | static bool |
75 | multiport_mt(const struct sk_buff *skb, struct xt_action_param *par) |
76 | { |
77 | const __be16 *pptr; |
78 | __be16 _ports[2]; |
79 | const struct xt_multiport_v1 *multiinfo = par->matchinfo; |
80 | |
81 | if (par->fragoff != 0) |
82 | return false; |
83 | |
84 | pptr = skb_header_pointer(skb, par->thoff, sizeof(_ports), _ports); |
85 | if (pptr == NULL) { |
86 | /* We've been asked to examine this packet, and we |
87 | * can't. Hence, no choice but to drop. |
88 | */ |
89 | pr_debug("Dropping evil offset=0 tinygram.\n"); |
90 | par->hotdrop = true; |
91 | return false; |
92 | } |
93 | |
94 | return ports_match_v1(multiinfo, ntohs(pptr[0]), ntohs(pptr[1])); |
95 | } |
96 | |
97 | static inline bool |
98 | check(u_int16_t proto, |
99 | u_int8_t ip_invflags, |
100 | u_int8_t match_flags, |
101 | u_int8_t count) |
102 | { |
103 | /* Must specify supported protocol, no unknown flags or bad count */ |
104 | return (proto == IPPROTO_TCP || proto == IPPROTO_UDP |
105 | || proto == IPPROTO_UDPLITE |
106 | || proto == IPPROTO_SCTP || proto == IPPROTO_DCCP) |
107 | && !(ip_invflags & XT_INV_PROTO) |
108 | && (match_flags == XT_MULTIPORT_SOURCE |
109 | || match_flags == XT_MULTIPORT_DESTINATION |
110 | || match_flags == XT_MULTIPORT_EITHER) |
111 | && count <= XT_MULTI_PORTS; |
112 | } |
113 | |
114 | static int multiport_mt_check(const struct xt_mtchk_param *par) |
115 | { |
116 | const struct ipt_ip *ip = par->entryinfo; |
117 | const struct xt_multiport_v1 *multiinfo = par->matchinfo; |
118 | |
119 | return check(ip->proto, ip->invflags, multiinfo->flags, |
120 | multiinfo->count) ? 0 : -EINVAL; |
121 | } |
122 | |
123 | static int multiport_mt6_check(const struct xt_mtchk_param *par) |
124 | { |
125 | const struct ip6t_ip6 *ip = par->entryinfo; |
126 | const struct xt_multiport_v1 *multiinfo = par->matchinfo; |
127 | |
128 | return check(ip->proto, ip->invflags, multiinfo->flags, |
129 | multiinfo->count) ? 0 : -EINVAL; |
130 | } |
131 | |
132 | static struct xt_match multiport_mt_reg[] __read_mostly = { |
133 | { |
134 | .name = "multiport", |
135 | .family = NFPROTO_IPV4, |
136 | .revision = 1, |
137 | .checkentry = multiport_mt_check, |
138 | .match = multiport_mt, |
139 | .matchsize = sizeof(struct xt_multiport_v1), |
140 | .me = THIS_MODULE, |
141 | }, |
142 | { |
143 | .name = "multiport", |
144 | .family = NFPROTO_IPV6, |
145 | .revision = 1, |
146 | .checkentry = multiport_mt6_check, |
147 | .match = multiport_mt, |
148 | .matchsize = sizeof(struct xt_multiport_v1), |
149 | .me = THIS_MODULE, |
150 | }, |
151 | }; |
152 | |
153 | static int __init multiport_mt_init(void) |
154 | { |
155 | return xt_register_matches(multiport_mt_reg, |
156 | ARRAY_SIZE(multiport_mt_reg)); |
157 | } |
158 | |
159 | static void __exit multiport_mt_exit(void) |
160 | { |
161 | xt_unregister_matches(multiport_mt_reg, ARRAY_SIZE(multiport_mt_reg)); |
162 | } |
163 | |
164 | module_init(multiport_mt_init); |
165 | module_exit(multiport_mt_exit); |
166 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9