ia64/linux-2.6.18-xen.hg

view net/netfilter/xt_multiport.c @ 871:9cbcc9008446

xen/x86: don't initialize cpu_data[]'s apicid field on generic code

Afaict, this is not only redundant with the intialization done in
drivers/xen/core/smpboot.c, but actually results - at least for
secondary CPUs - in the Xen-specific value written to be later
overwritten with whatever the generic code determines (with no
guarantee that the two values are identical).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu May 14 10:09:15 2009 +0100 (2009-05-14)
parents 831230e53067
children
line source
1 /* Kernel module to match one of a list of TCP/UDP/SCTP/DCCP ports: ports are in
2 the same place so we can treat them as equal. */
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 */
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>
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>
23 MODULE_LICENSE("GPL");
24 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
25 MODULE_DESCRIPTION("x_tables multiple port match module");
26 MODULE_ALIAS("ipt_multiport");
27 MODULE_ALIAS("ip6t_multiport");
29 #if 0
30 #define duprintf(format, args...) printk(format , ## args)
31 #else
32 #define duprintf(format, args...)
33 #endif
35 /* Returns 1 if the port is matched by the test, 0 otherwise. */
36 static inline int
37 ports_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;
45 if (flags != XT_MULTIPORT_SOURCE && portlist[i] == dst)
46 return 1;
47 }
49 return 0;
50 }
52 /* Returns 1 if the port is matched by the test, 0 otherwise. */
53 static inline int
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;
60 for (i = 0; i < minfo->count; i++) {
61 s = minfo->ports[i];
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);
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);
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 }
94 return minfo->invert;
95 }
97 static int
98 match(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;
110 if (offset)
111 return 0;
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 }
123 return ports_match(multiinfo->ports,
124 multiinfo->flags, multiinfo->count,
125 ntohs(pptr[0]), ntohs(pptr[1]));
126 }
128 static int
129 match_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;
141 if (offset)
142 return 0;
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 }
154 return ports_match_v1(multiinfo, ntohs(pptr[0]), ntohs(pptr[1]));
155 }
157 static inline int
158 check(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 supported protocol, no unknown flags or bad count */
164 return (proto == IPPROTO_TCP || proto == IPPROTO_UDP
165 || proto == IPPROTO_SCTP || proto == IPPROTO_DCCP)
166 && !(ip_invflags & XT_INV_PROTO)
167 && (match_flags == XT_MULTIPORT_SOURCE
168 || match_flags == XT_MULTIPORT_DESTINATION
169 || match_flags == XT_MULTIPORT_EITHER)
170 && count <= XT_MULTI_PORTS;
171 }
173 /* Called when user tries to insert an entry of this type. */
174 static int
175 checkentry(const char *tablename,
176 const void *info,
177 const struct xt_match *match,
178 void *matchinfo,
179 unsigned int matchsize,
180 unsigned int hook_mask)
181 {
182 const struct ipt_ip *ip = info;
183 const struct xt_multiport *multiinfo = matchinfo;
185 return check(ip->proto, ip->invflags, multiinfo->flags,
186 multiinfo->count);
187 }
189 static int
190 checkentry_v1(const char *tablename,
191 const void *info,
192 const struct xt_match *match,
193 void *matchinfo,
194 unsigned int matchsize,
195 unsigned int hook_mask)
196 {
197 const struct ipt_ip *ip = info;
198 const struct xt_multiport_v1 *multiinfo = matchinfo;
200 return check(ip->proto, ip->invflags, multiinfo->flags,
201 multiinfo->count);
202 }
204 static int
205 checkentry6(const char *tablename,
206 const void *info,
207 const struct xt_match *match,
208 void *matchinfo,
209 unsigned int matchsize,
210 unsigned int hook_mask)
211 {
212 const struct ip6t_ip6 *ip = info;
213 const struct xt_multiport *multiinfo = matchinfo;
215 return check(ip->proto, ip->invflags, multiinfo->flags,
216 multiinfo->count);
217 }
219 static int
220 checkentry6_v1(const char *tablename,
221 const void *info,
222 const struct xt_match *match,
223 void *matchinfo,
224 unsigned int matchsize,
225 unsigned int hook_mask)
226 {
227 const struct ip6t_ip6 *ip = info;
228 const struct xt_multiport_v1 *multiinfo = matchinfo;
230 return check(ip->proto, ip->invflags, multiinfo->flags,
231 multiinfo->count);
232 }
234 static struct xt_match multiport_match = {
235 .name = "multiport",
236 .revision = 0,
237 .matchsize = sizeof(struct xt_multiport),
238 .match = &match,
239 .checkentry = &checkentry,
240 .family = AF_INET,
241 .me = THIS_MODULE,
242 };
244 static struct xt_match multiport_match_v1 = {
245 .name = "multiport",
246 .revision = 1,
247 .matchsize = sizeof(struct xt_multiport_v1),
248 .match = &match_v1,
249 .checkentry = &checkentry_v1,
250 .family = AF_INET,
251 .me = THIS_MODULE,
252 };
254 static struct xt_match multiport6_match = {
255 .name = "multiport",
256 .revision = 0,
257 .matchsize = sizeof(struct xt_multiport),
258 .match = &match,
259 .checkentry = &checkentry6,
260 .family = AF_INET6,
261 .me = THIS_MODULE,
262 };
264 static struct xt_match multiport6_match_v1 = {
265 .name = "multiport",
266 .revision = 1,
267 .matchsize = sizeof(struct xt_multiport_v1),
268 .match = &match_v1,
269 .checkentry = &checkentry6_v1,
270 .family = AF_INET6,
271 .me = THIS_MODULE,
272 };
274 static int __init xt_multiport_init(void)
275 {
276 int ret;
278 ret = xt_register_match(&multiport_match);
279 if (ret)
280 goto out;
282 ret = xt_register_match(&multiport_match_v1);
283 if (ret)
284 goto out_unreg_multi_v0;
286 ret = xt_register_match(&multiport6_match);
287 if (ret)
288 goto out_unreg_multi_v1;
290 ret = xt_register_match(&multiport6_match_v1);
291 if (ret)
292 goto out_unreg_multi6_v0;
294 return ret;
296 out_unreg_multi6_v0:
297 xt_unregister_match(&multiport6_match);
298 out_unreg_multi_v1:
299 xt_unregister_match(&multiport_match_v1);
300 out_unreg_multi_v0:
301 xt_unregister_match(&multiport_match);
302 out:
303 return ret;
304 }
306 static void __exit xt_multiport_fini(void)
307 {
308 xt_unregister_match(&multiport_match);
309 xt_unregister_match(&multiport_match_v1);
310 xt_unregister_match(&multiport6_match);
311 xt_unregister_match(&multiport6_match_v1);
312 }
314 module_init(xt_multiport_init);
315 module_exit(xt_multiport_fini);