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authorYasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>2006-04-01 05:22:54 -0500
committerDavid S. Miller <davem@davemloft.net>2006-04-01 05:22:54 -0500
commita89ecb6a2ef732d04058d87801e2b6bd7e5c7089 (patch)
treec84c5b3167c116f0c419a2bbb04877bdac38dd07 /net
parentdc5ab2faece3b7473931357db7f63f596678481d (diff)
[NETFILTER]: x_tables: unify IPv4/IPv6 multiport match
This unifies ipt_multiport and ip6t_multiport to xt_multiport. As a result, this addes support for inversion and port range match to IPv6 packets. Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/netfilter/Kconfig10
-rw-r--r--net/ipv4/netfilter/Makefile1
-rw-r--r--net/ipv4/netfilter/ipt_multiport.c195
-rw-r--r--net/ipv6/netfilter/Kconfig10
-rw-r--r--net/ipv6/netfilter/Makefile1
-rw-r--r--net/ipv6/netfilter/ip6t_multiport.c125
-rw-r--r--net/netfilter/Kconfig10
-rw-r--r--net/netfilter/Makefile1
-rw-r--r--net/netfilter/xt_multiport.c314
9 files changed, 325 insertions, 342 deletions
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index ebbd644fa8c4..77855ccd6b43 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -221,16 +221,6 @@ config IP_NF_MATCH_IPRANGE
221 221
222 To compile it as a module, choose M here. If unsure, say N. 222 To compile it as a module, choose M here. If unsure, say N.
223 223
224config IP_NF_MATCH_MULTIPORT
225 tristate "Multiple port match support"
226 depends on IP_NF_IPTABLES
227 help
228 Multiport matching allows you to match TCP or UDP packets based on
229 a series of source or destination ports: normally a rule can only
230 match a single range of ports.
231
232 To compile it as a module, choose M here. If unsure, say N.
233
234config IP_NF_MATCH_TOS 224config IP_NF_MATCH_TOS
235 tristate "TOS match support" 225 tristate "TOS match support"
236 depends on IP_NF_IPTABLES 226 depends on IP_NF_IPTABLES
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 09ae167632e7..461cb1eb5de7 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -53,7 +53,6 @@ obj-$(CONFIG_IP_NF_RAW) += iptable_raw.o
53# matches 53# matches
54obj-$(CONFIG_IP_NF_MATCH_HASHLIMIT) += ipt_hashlimit.o 54obj-$(CONFIG_IP_NF_MATCH_HASHLIMIT) += ipt_hashlimit.o
55obj-$(CONFIG_IP_NF_MATCH_IPRANGE) += ipt_iprange.o 55obj-$(CONFIG_IP_NF_MATCH_IPRANGE) += ipt_iprange.o
56obj-$(CONFIG_IP_NF_MATCH_MULTIPORT) += ipt_multiport.o
57obj-$(CONFIG_IP_NF_MATCH_OWNER) += ipt_owner.o 56obj-$(CONFIG_IP_NF_MATCH_OWNER) += ipt_owner.o
58obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos.o 57obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos.o
59obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o 58obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
diff --git a/net/ipv4/netfilter/ipt_multiport.c b/net/ipv4/netfilter/ipt_multiport.c
deleted file mode 100644
index ac95d8390bcc..000000000000
--- a/net/ipv4/netfilter/ipt_multiport.c
+++ /dev/null
@@ -1,195 +0,0 @@
1/* Kernel module to match one of a list of TCP/UDP ports: ports are in
2 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
12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/udp.h>
15#include <linux/skbuff.h>
16
17#include <linux/netfilter_ipv4/ipt_multiport.h>
18#include <linux/netfilter_ipv4/ip_tables.h>
19
20MODULE_LICENSE("GPL");
21MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
22MODULE_DESCRIPTION("iptables multiple port match module");
23
24#if 0
25#define duprintf(format, args...) printk(format , ## args)
26#else
27#define duprintf(format, args...)
28#endif
29
30/* Returns 1 if the port is matched by the test, 0 otherwise. */
31static inline int
32ports_match(const u_int16_t *portlist, enum ipt_multiport_flags flags,
33 u_int8_t count, u_int16_t src, u_int16_t dst)
34{
35 unsigned int i;
36 for (i=0; i<count; i++) {
37 if (flags != IPT_MULTIPORT_DESTINATION
38 && portlist[i] == src)
39 return 1;
40
41 if (flags != IPT_MULTIPORT_SOURCE
42 && portlist[i] == dst)
43 return 1;
44 }
45
46 return 0;
47}
48
49/* Returns 1 if the port is matched by the test, 0 otherwise. */
50static inline int
51ports_match_v1(const struct ipt_multiport_v1 *minfo,
52 u_int16_t src, u_int16_t dst)
53{
54 unsigned int i;
55 u_int16_t s, e;
56
57 for (i=0; i < minfo->count; i++) {
58 s = minfo->ports[i];
59
60 if (minfo->pflags[i]) {
61 /* range port matching */
62 e = minfo->ports[++i];
63 duprintf("src or dst matches with %d-%d?\n", s, e);
64
65 if (minfo->flags == IPT_MULTIPORT_SOURCE
66 && src >= s && src <= e)
67 return 1 ^ minfo->invert;
68 if (minfo->flags == IPT_MULTIPORT_DESTINATION
69 && dst >= s && dst <= e)
70 return 1 ^ minfo->invert;
71 if (minfo->flags == IPT_MULTIPORT_EITHER
72 && ((dst >= s && dst <= e)
73 || (src >= s && src <= e)))
74 return 1 ^ minfo->invert;
75 } else {
76 /* exact port matching */
77 duprintf("src or dst matches with %d?\n", s);
78
79 if (minfo->flags == IPT_MULTIPORT_SOURCE
80 && src == s)
81 return 1 ^ minfo->invert;
82 if (minfo->flags == IPT_MULTIPORT_DESTINATION
83 && dst == s)
84 return 1 ^ minfo->invert;
85 if (minfo->flags == IPT_MULTIPORT_EITHER
86 && (src == s || dst == s))
87 return 1 ^ minfo->invert;
88 }
89 }
90
91 return minfo->invert;
92}
93
94static int
95match(const struct sk_buff *skb,
96 const struct net_device *in,
97 const struct net_device *out,
98 const struct xt_match *match,
99 const void *matchinfo,
100 int offset,
101 unsigned int protoff,
102 int *hotdrop)
103{
104 u16 _ports[2], *pptr;
105 const struct ipt_multiport *multiinfo = matchinfo;
106
107 if (offset)
108 return 0;
109
110 pptr = skb_header_pointer(skb, protoff,
111 sizeof(_ports), _ports);
112 if (pptr == NULL) {
113 /* We've been asked to examine this packet, and we
114 * can't. Hence, no choice but to drop.
115 */
116 duprintf("ipt_multiport:"
117 " Dropping evil offset=0 tinygram.\n");
118 *hotdrop = 1;
119 return 0;
120 }
121
122 return ports_match(multiinfo->ports,
123 multiinfo->flags, multiinfo->count,
124 ntohs(pptr[0]), ntohs(pptr[1]));
125}
126
127static int
128match_v1(const struct sk_buff *skb,
129 const struct net_device *in,
130 const struct net_device *out,
131 const struct xt_match *match,
132 const void *matchinfo,
133 int offset,
134 unsigned int protoff,
135 int *hotdrop)
136{
137 u16 _ports[2], *pptr;
138 const struct ipt_multiport_v1 *multiinfo = matchinfo;
139
140 if (offset)
141 return 0;
142
143 pptr = skb_header_pointer(skb, protoff,
144 sizeof(_ports), _ports);
145 if (pptr == NULL) {
146 /* We've been asked to examine this packet, and we
147 * can't. Hence, no choice but to drop.
148 */
149 duprintf("ipt_multiport:"
150 " Dropping evil offset=0 tinygram.\n");
151 *hotdrop = 1;
152 return 0;
153 }
154
155 return ports_match_v1(multiinfo, ntohs(pptr[0]), ntohs(pptr[1]));
156}
157
158static struct ipt_match multiport_match = {
159 .name = "multiport",
160 .revision = 0,
161 .match = match,
162 .matchsize = sizeof(struct ipt_multiport),
163 .me = THIS_MODULE,
164};
165
166static struct ipt_match multiport_match_v1 = {
167 .name = "multiport",
168 .revision = 1,
169 .match = match_v1,
170 .matchsize = sizeof(struct ipt_multiport_v1),
171 .me = THIS_MODULE,
172};
173
174static int __init ipt_multiport_init(void)
175{
176 int err;
177
178 err = ipt_register_match(&multiport_match);
179 if (!err) {
180 err = ipt_register_match(&multiport_match_v1);
181 if (err)
182 ipt_unregister_match(&multiport_match);
183 }
184
185 return err;
186}
187
188static void __exit ipt_multiport_fini(void)
189{
190 ipt_unregister_match(&multiport_match);
191 ipt_unregister_match(&multiport_match_v1);
192}
193
194module_init(ipt_multiport_init);
195module_exit(ipt_multiport_fini);
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index bdd569fc66cb..4bc4e5b33794 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -87,16 +87,6 @@ config IP6_NF_MATCH_HL
87 87
88 To compile it as a module, choose M here. If unsure, say N. 88 To compile it as a module, choose M here. If unsure, say N.
89 89
90config IP6_NF_MATCH_MULTIPORT
91 tristate "Multiple port match support"
92 depends on IP6_NF_IPTABLES
93 help
94 Multiport matching allows you to match TCP or UDP packets based on
95 a series of source or destination ports: normally a rule can only
96 match a single range of ports.
97
98 To compile it as a module, choose M here. If unsure, say N.
99
100config IP6_NF_MATCH_OWNER 90config IP6_NF_MATCH_OWNER
101 tristate "Owner match support" 91 tristate "Owner match support"
102 depends on IP6_NF_IPTABLES 92 depends on IP6_NF_IPTABLES
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index c38717011e64..eeeb57d4c9c5 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -10,7 +10,6 @@ obj-$(CONFIG_IP6_NF_MATCH_IPV6HEADER) += ip6t_ipv6header.o
10obj-$(CONFIG_IP6_NF_MATCH_FRAG) += ip6t_frag.o 10obj-$(CONFIG_IP6_NF_MATCH_FRAG) += ip6t_frag.o
11obj-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o 11obj-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o
12obj-$(CONFIG_IP6_NF_MATCH_EUI64) += ip6t_eui64.o 12obj-$(CONFIG_IP6_NF_MATCH_EUI64) += ip6t_eui64.o
13obj-$(CONFIG_IP6_NF_MATCH_MULTIPORT) += ip6t_multiport.o
14obj-$(CONFIG_IP6_NF_MATCH_OWNER) += ip6t_owner.o 13obj-$(CONFIG_IP6_NF_MATCH_OWNER) += ip6t_owner.o
15obj-$(CONFIG_IP6_NF_FILTER) += ip6table_filter.o 14obj-$(CONFIG_IP6_NF_FILTER) += ip6table_filter.o
16obj-$(CONFIG_IP6_NF_MANGLE) += ip6table_mangle.o 15obj-$(CONFIG_IP6_NF_MANGLE) += ip6table_mangle.o
diff --git a/net/ipv6/netfilter/ip6t_multiport.c b/net/ipv6/netfilter/ip6t_multiport.c
deleted file mode 100644
index 10c48ba596d6..000000000000
--- a/net/ipv6/netfilter/ip6t_multiport.c
+++ /dev/null
@@ -1,125 +0,0 @@
1/* Kernel module to match one of a list of TCP/UDP ports: ports are in
2 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
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_ipv6/ip6t_multiport.h>
19#include <linux/netfilter_ipv6/ip6_tables.h>
20
21MODULE_LICENSE("GPL");
22MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
23MODULE_DESCRIPTION("ip6tables match for multiple ports");
24
25#if 0
26#define duprintf(format, args...) printk(format , ## args)
27#else
28#define duprintf(format, args...)
29#endif
30
31/* Returns 1 if the port is matched by the test, 0 otherwise. */
32static inline int
33ports_match(const u_int16_t *portlist, enum ip6t_multiport_flags flags,
34 u_int8_t count, u_int16_t src, u_int16_t dst)
35{
36 unsigned int i;
37 for (i=0; i<count; i++) {
38 if (flags != IP6T_MULTIPORT_DESTINATION
39 && portlist[i] == src)
40 return 1;
41
42 if (flags != IP6T_MULTIPORT_SOURCE
43 && portlist[i] == dst)
44 return 1;
45 }
46
47 return 0;
48}
49
50static int
51match(const struct sk_buff *skb,
52 const struct net_device *in,
53 const struct net_device *out,
54 const struct xt_match *match,
55 const void *matchinfo,
56 int offset,
57 unsigned int protoff,
58 int *hotdrop)
59{
60 u16 _ports[2], *pptr;
61 const struct ip6t_multiport *multiinfo = matchinfo;
62
63 /* Must not be a fragment. */
64 if (offset)
65 return 0;
66
67 /* Must be big enough to read ports (both UDP and TCP have
68 them at the start). */
69 pptr = skb_header_pointer(skb, protoff, sizeof(_ports), &_ports[0]);
70 if (pptr == NULL) {
71 /* We've been asked to examine this packet, and we
72 * can't. Hence, no choice but to drop.
73 */
74 duprintf("ip6t_multiport:"
75 " Dropping evil offset=0 tinygram.\n");
76 *hotdrop = 1;
77 return 0;
78 }
79
80 return ports_match(multiinfo->ports,
81 multiinfo->flags, multiinfo->count,
82 ntohs(pptr[0]), ntohs(pptr[1]));
83}
84
85/* Called when user tries to insert an entry of this type. */
86static int
87checkentry(const char *tablename,
88 const void *info,
89 const struct xt_match *match,
90 void *matchinfo,
91 unsigned int matchsize,
92 unsigned int hook_mask)
93{
94 const struct ip6t_ip6 *ip = info;
95 const struct ip6t_multiport *multiinfo = matchinfo;
96
97 /* Must specify proto == TCP/UDP, no unknown flags or bad count */
98 return (ip->proto == IPPROTO_TCP || ip->proto == IPPROTO_UDP)
99 && !(ip->invflags & IP6T_INV_PROTO)
100 && (multiinfo->flags == IP6T_MULTIPORT_SOURCE
101 || multiinfo->flags == IP6T_MULTIPORT_DESTINATION
102 || multiinfo->flags == IP6T_MULTIPORT_EITHER)
103 && multiinfo->count <= IP6T_MULTI_PORTS;
104}
105
106static struct ip6t_match multiport_match = {
107 .name = "multiport",
108 .match = match,
109 .matchsize = sizeof(struct ip6t_multiport),
110 .checkentry = checkentry,
111 .me = THIS_MODULE,
112};
113
114static int __init ip6t_multiport_init(void)
115{
116 return ip6t_register_match(&multiport_match);
117}
118
119static void __exit ip6t_multiport_fini(void)
120{
121 ip6t_unregister_match(&multiport_match);
122}
123
124module_init(ip6t_multiport_init);
125module_exit(ip6t_multiport_fini);
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 5fe51894b120..e2893effdfaa 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -298,6 +298,16 @@ config NETFILTER_XT_MATCH_POLICY
298 298
299 To compile it as a module, choose M here. If unsure, say N. 299 To compile it as a module, choose M here. If unsure, say N.
300 300
301config NETFILTER_XT_MATCH_MULTIPORT
302 tristate "Multiple port match support"
303 depends on NETFILTER_XTABLES
304 help
305 Multiport matching allows you to match TCP or UDP packets based on
306 a series of source or destination ports: normally a rule can only
307 match a single range of ports.
308
309 To compile it as a module, choose M here. If unsure, say N.
310
301config NETFILTER_XT_MATCH_PHYSDEV 311config NETFILTER_XT_MATCH_PHYSDEV
302 tristate '"physdev" match support' 312 tristate '"physdev" match support'
303 depends on NETFILTER_XTABLES && BRIDGE_NETFILTER 313 depends on NETFILTER_XTABLES && BRIDGE_NETFILTER
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 8f02486101ab..95b7e416512d 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_LENGTH) += xt_length.o
41obj-$(CONFIG_NETFILTER_XT_MATCH_LIMIT) += xt_limit.o 41obj-$(CONFIG_NETFILTER_XT_MATCH_LIMIT) += xt_limit.o
42obj-$(CONFIG_NETFILTER_XT_MATCH_MAC) += xt_mac.o 42obj-$(CONFIG_NETFILTER_XT_MATCH_MAC) += xt_mac.o
43obj-$(CONFIG_NETFILTER_XT_MATCH_MARK) += xt_mark.o 43obj-$(CONFIG_NETFILTER_XT_MATCH_MARK) += xt_mark.o
44obj-$(CONFIG_NETFILTER_XT_MATCH_MULTIPORT) += xt_multiport.o
44obj-$(CONFIG_NETFILTER_XT_MATCH_POLICY) += xt_policy.o 45obj-$(CONFIG_NETFILTER_XT_MATCH_POLICY) += xt_policy.o
45obj-$(CONFIG_NETFILTER_XT_MATCH_PKTTYPE) += xt_pkttype.o 46obj-$(CONFIG_NETFILTER_XT_MATCH_PKTTYPE) += xt_pkttype.o
46obj-$(CONFIG_NETFILTER_XT_MATCH_REALM) += xt_realm.o 47obj-$(CONFIG_NETFILTER_XT_MATCH_REALM) += xt_realm.o
diff --git a/net/netfilter/xt_multiport.c b/net/netfilter/xt_multiport.c
new file mode 100644
index 000000000000..b56cd2baaac2
--- /dev/null
+++ b/net/netfilter/xt_multiport.c
@@ -0,0 +1,314 @@
1/* Kernel module to match one of a list of TCP/UDP ports: ports are in
2 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
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
23MODULE_LICENSE("GPL");
24MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
25MODULE_DESCRIPTION("x_tables multiple port match module");
26MODULE_ALIAS("ipt_multiport");
27MODULE_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. */
36static inline int
37ports_match(const u_int16_t *portlist, enum xt_multiport_flags flags,
38 u_int8_t count, u_int16_t src, u_int16_t dst)
39{
40 unsigned int i;
41 for (i = 0; i < count; i++) {
42 if (flags != XT_MULTIPORT_DESTINATION && portlist[i] == src)
43 return 1;
44
45 if (flags != XT_MULTIPORT_SOURCE && portlist[i] == dst)
46 return 1;
47 }
48
49 return 0;
50}
51
52/* Returns 1 if the port is matched by the test, 0 otherwise. */
53static inline int
54ports_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)
70 return 1 ^ minfo->invert;
71 if (minfo->flags == XT_MULTIPORT_DESTINATION
72 && dst >= s && dst <= e)
73 return 1 ^ minfo->invert;
74 if (minfo->flags == XT_MULTIPORT_EITHER
75 && ((dst >= s && dst <= e)
76 || (src >= s && src <= e)))
77 return 1 ^ minfo->invert;
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)
84 return 1 ^ minfo->invert;
85 if (minfo->flags == XT_MULTIPORT_DESTINATION
86 && dst == s)
87 return 1 ^ minfo->invert;
88 if (minfo->flags == XT_MULTIPORT_EITHER
89 && (src == s || dst == s))
90 return 1 ^ minfo->invert;
91 }
92 }
93
94 return minfo->invert;
95}
96
97static int
98match(const struct sk_buff *skb,
99 const struct net_device *in,
100 const struct net_device *out,
101 const struct xt_match *match,
102 const void *matchinfo,
103 int offset,
104 unsigned int protoff,
105 int *hotdrop)
106{
107 u16 _ports[2], *pptr;
108 const struct xt_multiport *multiinfo = matchinfo;
109
110 if (offset)
111 return 0;
112
113 pptr = skb_header_pointer(skb, protoff, sizeof(_ports), _ports);
114 if (pptr == NULL) {
115 /* We've been asked to examine this packet, and we
116 * can't. Hence, no choice but to drop.
117 */
118 duprintf("xt_multiport: Dropping evil offset=0 tinygram.\n");
119 *hotdrop = 1;
120 return 0;
121 }
122
123 return ports_match(multiinfo->ports,
124 multiinfo->flags, multiinfo->count,
125 ntohs(pptr[0]), ntohs(pptr[1]));
126}
127
128static int
129match_v1(const struct sk_buff *skb,
130 const struct net_device *in,
131 const struct net_device *out,
132 const struct xt_match *match,
133 const void *matchinfo,
134 int offset,
135 unsigned int protoff,
136 int *hotdrop)
137{
138 u16 _ports[2], *pptr;
139 const struct xt_multiport_v1 *multiinfo = matchinfo;
140
141 if (offset)
142 return 0;
143
144 pptr = skb_header_pointer(skb, protoff, sizeof(_ports), _ports);
145 if (pptr == NULL) {
146 /* We've been asked to examine this packet, and we
147 * can't. Hence, no choice but to drop.
148 */
149 duprintf("xt_multiport: Dropping evil offset=0 tinygram.\n");
150 *hotdrop = 1;
151 return 0;
152 }
153
154 return ports_match_v1(multiinfo, ntohs(pptr[0]), ntohs(pptr[1]));
155}
156
157static inline int
158check(u_int16_t proto,
159 u_int8_t ip_invflags,
160 u_int8_t match_flags,
161 u_int8_t count)
162{
163 /* Must specify proto == TCP/UDP, no unknown flags or bad count */
164 return (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
165 && !(ip_invflags & XT_INV_PROTO)
166 && (match_flags == XT_MULTIPORT_SOURCE
167 || match_flags == XT_MULTIPORT_DESTINATION
168 || match_flags == XT_MULTIPORT_EITHER)
169 && count <= XT_MULTI_PORTS;
170}
171
172/* Called when user tries to insert an entry of this type. */
173static int
174checkentry(const char *tablename,
175 const void *info,
176 const struct xt_match *match,
177 void *matchinfo,
178 unsigned int matchsize,
179 unsigned int hook_mask)
180{
181 const struct ipt_ip *ip = info;
182 const struct xt_multiport *multiinfo = matchinfo;
183
184 return check(ip->proto, ip->invflags, multiinfo->flags,
185 multiinfo->count);
186}
187
188static int
189checkentry_v1(const char *tablename,
190 const void *info,
191 const struct xt_match *match,
192 void *matchinfo,
193 unsigned int matchsize,
194 unsigned int hook_mask)
195{
196 const struct ipt_ip *ip = info;
197 const struct xt_multiport_v1 *multiinfo = matchinfo;
198
199 return check(ip->proto, ip->invflags, multiinfo->flags,
200 multiinfo->count);
201}
202
203static int
204checkentry6(const char *tablename,
205 const void *info,
206 const struct xt_match *match,
207 void *matchinfo,
208 unsigned int matchsize,
209 unsigned int hook_mask)
210{
211 const struct ip6t_ip6 *ip = info;
212 const struct xt_multiport *multiinfo = matchinfo;
213
214 return check(ip->proto, ip->invflags, multiinfo->flags,
215 multiinfo->count);
216}
217
218static int
219checkentry6_v1(const char *tablename,
220 const void *info,
221 const struct xt_match *match,
222 void *matchinfo,
223 unsigned int matchsize,
224 unsigned int hook_mask)
225{
226 const struct ip6t_ip6 *ip = info;
227 const struct xt_multiport_v1 *multiinfo = matchinfo;
228
229 return check(ip->proto, ip->invflags, multiinfo->flags,
230 multiinfo->count);
231}
232
233static struct xt_match multiport_match = {
234 .name = "multiport",
235 .revision = 0,
236 .matchsize = sizeof(struct xt_multiport),
237 .match = &match,
238 .checkentry = &checkentry,
239 .family = AF_INET,
240 .me = THIS_MODULE,
241};
242
243static struct xt_match multiport_match_v1 = {
244 .name = "multiport",
245 .revision = 1,
246 .matchsize = sizeof(struct xt_multiport_v1),
247 .match = &match_v1,
248 .checkentry = &checkentry_v1,
249 .family = AF_INET,
250 .me = THIS_MODULE,
251};
252
253static struct xt_match multiport6_match = {
254 .name = "multiport",
255 .revision = 0,
256 .matchsize = sizeof(struct xt_multiport),
257 .match = &match,
258 .checkentry = &checkentry6,
259 .family = AF_INET6,
260 .me = THIS_MODULE,
261};
262
263static struct xt_match multiport6_match_v1 = {
264 .name = "multiport",
265 .revision = 1,
266 .matchsize = sizeof(struct xt_multiport_v1),
267 .match = &match_v1,
268 .checkentry = &checkentry6_v1,
269 .family = AF_INET6,
270 .me = THIS_MODULE,
271};
272
273static int __init xt_multiport_init(void)
274{
275 int ret;
276
277 ret = xt_register_match(&multiport_match);
278 if (ret)
279 goto out;
280
281 ret = xt_register_match(&multiport_match_v1);
282 if (ret)
283 goto out_unreg_multi_v0;
284
285 ret = xt_register_match(&multiport6_match);
286 if (ret)
287 goto out_unreg_multi_v1;
288
289 ret = xt_register_match(&multiport6_match_v1);
290 if (ret)
291 goto out_unreg_multi6_v0;
292
293 return ret;
294
295out_unreg_multi6_v0:
296 xt_unregister_match(&multiport6_match);
297out_unreg_multi_v1:
298 xt_unregister_match(&multiport_match_v1);
299out_unreg_multi_v0:
300 xt_unregister_match(&multiport_match);
301out:
302 return ret;
303}
304
305static void __exit xt_multiport_fini(void)
306{
307 xt_unregister_match(&multiport_match);
308 xt_unregister_match(&multiport_match_v1);
309 xt_unregister_match(&multiport6_match);
310 xt_unregister_match(&multiport6_match_v1);
311}
312
313module_init(xt_multiport_init);
314module_exit(xt_multiport_fini);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-19 04:44:02 -0500