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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Packet matching code. | |
3 | * | |
4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
6b7d31fc | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
1da177e4 LT |
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. | |
1da177e4 | 10 | */ |
4fc268d2 RD |
11 | |
12 | #include <linux/capability.h> | |
14c85021 | 13 | #include <linux/in.h> |
1da177e4 LT |
14 | #include <linux/skbuff.h> |
15 | #include <linux/kmod.h> | |
16 | #include <linux/vmalloc.h> | |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/module.h> | |
4bdbf6c0 | 19 | #include <linux/poison.h> |
1da177e4 | 20 | #include <linux/icmpv6.h> |
1da177e4 LT |
21 | #include <net/ipv6.h> |
22 | #include <asm/uaccess.h> | |
57b47a53 | 23 | #include <linux/mutex.h> |
1da177e4 | 24 | #include <linux/proc_fs.h> |
c8923c6b | 25 | #include <linux/cpumask.h> |
1da177e4 LT |
26 | |
27 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
2e4e6a17 | 28 | #include <linux/netfilter/x_tables.h> |
1da177e4 LT |
29 | |
30 | MODULE_LICENSE("GPL"); | |
31 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
32 | MODULE_DESCRIPTION("IPv6 packet filter"); | |
33 | ||
1da177e4 LT |
34 | /*#define DEBUG_IP_FIREWALL*/ |
35 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
36 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
37 | ||
38 | #ifdef DEBUG_IP_FIREWALL | |
39 | #define dprintf(format, args...) printk(format , ## args) | |
40 | #else | |
41 | #define dprintf(format, args...) | |
42 | #endif | |
43 | ||
44 | #ifdef DEBUG_IP_FIREWALL_USER | |
45 | #define duprintf(format, args...) printk(format , ## args) | |
46 | #else | |
47 | #define duprintf(format, args...) | |
48 | #endif | |
49 | ||
50 | #ifdef CONFIG_NETFILTER_DEBUG | |
51 | #define IP_NF_ASSERT(x) \ | |
52 | do { \ | |
53 | if (!(x)) \ | |
54 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ | |
55 | __FUNCTION__, __FILE__, __LINE__); \ | |
56 | } while(0) | |
57 | #else | |
58 | #define IP_NF_ASSERT(x) | |
59 | #endif | |
1da177e4 | 60 | |
1da177e4 LT |
61 | #if 0 |
62 | /* All the better to debug you with... */ | |
63 | #define static | |
64 | #define inline | |
65 | #endif | |
66 | ||
6b7d31fc | 67 | /* |
1da177e4 | 68 | We keep a set of rules for each CPU, so we can avoid write-locking |
6b7d31fc HW |
69 | them in the softirq when updating the counters and therefore |
70 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
71 | context stops packets coming through and allows user context to read | |
72 | the counters or update the rules. | |
1da177e4 | 73 | |
1da177e4 LT |
74 | Hence the start of any table is given by get_table() below. */ |
75 | ||
1da177e4 | 76 | /* Check for an extension */ |
1ab1457c | 77 | int |
1da177e4 LT |
78 | ip6t_ext_hdr(u8 nexthdr) |
79 | { | |
1ab1457c YH |
80 | return ( (nexthdr == IPPROTO_HOPOPTS) || |
81 | (nexthdr == IPPROTO_ROUTING) || | |
82 | (nexthdr == IPPROTO_FRAGMENT) || | |
83 | (nexthdr == IPPROTO_ESP) || | |
84 | (nexthdr == IPPROTO_AH) || | |
85 | (nexthdr == IPPROTO_NONE) || | |
86 | (nexthdr == IPPROTO_DSTOPTS) ); | |
1da177e4 LT |
87 | } |
88 | ||
89 | /* Returns whether matches rule or not. */ | |
1d93a9cb | 90 | static inline bool |
1da177e4 LT |
91 | ip6_packet_match(const struct sk_buff *skb, |
92 | const char *indev, | |
93 | const char *outdev, | |
94 | const struct ip6t_ip6 *ip6info, | |
95 | unsigned int *protoff, | |
cff533ac | 96 | int *fragoff, bool *hotdrop) |
1da177e4 LT |
97 | { |
98 | size_t i; | |
99 | unsigned long ret; | |
0660e03f | 100 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
1da177e4 LT |
101 | |
102 | #define FWINV(bool,invflg) ((bool) ^ !!(ip6info->invflags & invflg)) | |
103 | ||
f2ffd9ee | 104 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
1ab1457c | 105 | &ip6info->src), IP6T_INV_SRCIP) |
f2ffd9ee | 106 | || FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, |
1ab1457c | 107 | &ip6info->dst), IP6T_INV_DSTIP)) { |
1da177e4 LT |
108 | dprintf("Source or dest mismatch.\n"); |
109 | /* | |
110 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, | |
111 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, | |
112 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); | |
113 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, | |
114 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, | |
115 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ | |
1d93a9cb | 116 | return false; |
1da177e4 LT |
117 | } |
118 | ||
119 | /* Look for ifname matches; this should unroll nicely. */ | |
120 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
121 | ret |= (((const unsigned long *)indev)[i] | |
122 | ^ ((const unsigned long *)ip6info->iniface)[i]) | |
123 | & ((const unsigned long *)ip6info->iniface_mask)[i]; | |
124 | } | |
125 | ||
126 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { | |
127 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
128 | indev, ip6info->iniface, | |
129 | ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":""); | |
1d93a9cb | 130 | return false; |
1da177e4 LT |
131 | } |
132 | ||
133 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
134 | ret |= (((const unsigned long *)outdev)[i] | |
135 | ^ ((const unsigned long *)ip6info->outiface)[i]) | |
136 | & ((const unsigned long *)ip6info->outiface_mask)[i]; | |
137 | } | |
138 | ||
139 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { | |
140 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
141 | outdev, ip6info->outiface, | |
142 | ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":""); | |
1d93a9cb | 143 | return false; |
1da177e4 LT |
144 | } |
145 | ||
146 | /* ... might want to do something with class and flowlabel here ... */ | |
147 | ||
148 | /* look for the desired protocol header */ | |
149 | if((ip6info->flags & IP6T_F_PROTO)) { | |
b777e0ce PM |
150 | int protohdr; |
151 | unsigned short _frag_off; | |
1da177e4 | 152 | |
b777e0ce | 153 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off); |
51d8b1a6 PM |
154 | if (protohdr < 0) { |
155 | if (_frag_off == 0) | |
cff533ac | 156 | *hotdrop = true; |
1d93a9cb | 157 | return false; |
51d8b1a6 | 158 | } |
b777e0ce | 159 | *fragoff = _frag_off; |
1da177e4 LT |
160 | |
161 | dprintf("Packet protocol %hi ?= %s%hi.\n", | |
1ab1457c | 162 | protohdr, |
1da177e4 LT |
163 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
164 | ip6info->proto); | |
165 | ||
b777e0ce | 166 | if (ip6info->proto == protohdr) { |
1da177e4 | 167 | if(ip6info->invflags & IP6T_INV_PROTO) { |
1d93a9cb | 168 | return false; |
1da177e4 | 169 | } |
1d93a9cb | 170 | return true; |
1da177e4 LT |
171 | } |
172 | ||
173 | /* We need match for the '-p all', too! */ | |
174 | if ((ip6info->proto != 0) && | |
175 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
1d93a9cb | 176 | return false; |
1da177e4 | 177 | } |
1d93a9cb | 178 | return true; |
1da177e4 LT |
179 | } |
180 | ||
181 | /* should be ip6 safe */ | |
ccb79bdc | 182 | static inline bool |
1da177e4 LT |
183 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
184 | { | |
185 | if (ipv6->flags & ~IP6T_F_MASK) { | |
186 | duprintf("Unknown flag bits set: %08X\n", | |
187 | ipv6->flags & ~IP6T_F_MASK); | |
ccb79bdc | 188 | return false; |
1da177e4 LT |
189 | } |
190 | if (ipv6->invflags & ~IP6T_INV_MASK) { | |
191 | duprintf("Unknown invflag bits set: %08X\n", | |
192 | ipv6->invflags & ~IP6T_INV_MASK); | |
ccb79bdc | 193 | return false; |
1da177e4 | 194 | } |
ccb79bdc | 195 | return true; |
1da177e4 LT |
196 | } |
197 | ||
198 | static unsigned int | |
3db05fea | 199 | ip6t_error(struct sk_buff *skb, |
1da177e4 LT |
200 | const struct net_device *in, |
201 | const struct net_device *out, | |
202 | unsigned int hooknum, | |
c4986734 | 203 | const struct xt_target *target, |
fe1cb108 | 204 | const void *targinfo) |
1da177e4 LT |
205 | { |
206 | if (net_ratelimit()) | |
207 | printk("ip6_tables: error: `%s'\n", (char *)targinfo); | |
208 | ||
209 | return NF_DROP; | |
210 | } | |
211 | ||
212 | static inline | |
1d93a9cb JE |
213 | bool do_match(struct ip6t_entry_match *m, |
214 | const struct sk_buff *skb, | |
215 | const struct net_device *in, | |
216 | const struct net_device *out, | |
217 | int offset, | |
218 | unsigned int protoff, | |
219 | bool *hotdrop) | |
1da177e4 LT |
220 | { |
221 | /* Stop iteration if it doesn't match */ | |
1c524830 | 222 | if (!m->u.kernel.match->match(skb, in, out, m->u.kernel.match, m->data, |
1da177e4 | 223 | offset, protoff, hotdrop)) |
1d93a9cb | 224 | return true; |
1da177e4 | 225 | else |
1d93a9cb | 226 | return false; |
1da177e4 LT |
227 | } |
228 | ||
229 | static inline struct ip6t_entry * | |
230 | get_entry(void *base, unsigned int offset) | |
231 | { | |
232 | return (struct ip6t_entry *)(base + offset); | |
233 | } | |
234 | ||
ba9dda3a JK |
235 | /* All zeroes == unconditional rule. */ |
236 | static inline int | |
237 | unconditional(const struct ip6t_ip6 *ipv6) | |
238 | { | |
239 | unsigned int i; | |
240 | ||
241 | for (i = 0; i < sizeof(*ipv6); i++) | |
242 | if (((char *)ipv6)[i]) | |
243 | break; | |
244 | ||
245 | return (i == sizeof(*ipv6)); | |
246 | } | |
247 | ||
248 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
249 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
250 | /* This cries for unification! */ | |
251 | static const char *hooknames[] = { | |
6e23ae2a PM |
252 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
253 | [NF_INET_LOCAL_IN] = "INPUT", | |
254 | [NF_INET_FORWARD] = "FORWARD", | |
255 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
256 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
257 | }; |
258 | ||
259 | enum nf_ip_trace_comments { | |
260 | NF_IP6_TRACE_COMMENT_RULE, | |
261 | NF_IP6_TRACE_COMMENT_RETURN, | |
262 | NF_IP6_TRACE_COMMENT_POLICY, | |
263 | }; | |
264 | ||
265 | static const char *comments[] = { | |
266 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", | |
267 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
268 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
269 | }; | |
270 | ||
271 | static struct nf_loginfo trace_loginfo = { | |
272 | .type = NF_LOG_TYPE_LOG, | |
273 | .u = { | |
274 | .log = { | |
275 | .level = 4, | |
276 | .logflags = NF_LOG_MASK, | |
277 | }, | |
278 | }, | |
279 | }; | |
280 | ||
281 | static inline int | |
282 | get_chainname_rulenum(struct ip6t_entry *s, struct ip6t_entry *e, | |
283 | char *hookname, char **chainname, | |
284 | char **comment, unsigned int *rulenum) | |
285 | { | |
286 | struct ip6t_standard_target *t = (void *)ip6t_get_target(s); | |
287 | ||
288 | if (strcmp(t->target.u.kernel.target->name, IP6T_ERROR_TARGET) == 0) { | |
289 | /* Head of user chain: ERROR target with chainname */ | |
290 | *chainname = t->target.data; | |
291 | (*rulenum) = 0; | |
292 | } else if (s == e) { | |
293 | (*rulenum)++; | |
294 | ||
295 | if (s->target_offset == sizeof(struct ip6t_entry) | |
296 | && strcmp(t->target.u.kernel.target->name, | |
297 | IP6T_STANDARD_TARGET) == 0 | |
298 | && t->verdict < 0 | |
299 | && unconditional(&s->ipv6)) { | |
300 | /* Tail of chains: STANDARD target (return/policy) */ | |
301 | *comment = *chainname == hookname | |
302 | ? (char *)comments[NF_IP6_TRACE_COMMENT_POLICY] | |
303 | : (char *)comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
304 | } | |
305 | return 1; | |
306 | } else | |
307 | (*rulenum)++; | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | static void trace_packet(struct sk_buff *skb, | |
313 | unsigned int hook, | |
314 | const struct net_device *in, | |
315 | const struct net_device *out, | |
316 | char *tablename, | |
317 | struct xt_table_info *private, | |
318 | struct ip6t_entry *e) | |
319 | { | |
320 | void *table_base; | |
321 | struct ip6t_entry *root; | |
322 | char *hookname, *chainname, *comment; | |
323 | unsigned int rulenum = 0; | |
324 | ||
325 | table_base = (void *)private->entries[smp_processor_id()]; | |
326 | root = get_entry(table_base, private->hook_entry[hook]); | |
327 | ||
328 | hookname = chainname = (char *)hooknames[hook]; | |
329 | comment = (char *)comments[NF_IP6_TRACE_COMMENT_RULE]; | |
330 | ||
331 | IP6T_ENTRY_ITERATE(root, | |
332 | private->size - private->hook_entry[hook], | |
333 | get_chainname_rulenum, | |
334 | e, hookname, &chainname, &comment, &rulenum); | |
335 | ||
336 | nf_log_packet(AF_INET6, hook, skb, in, out, &trace_loginfo, | |
337 | "TRACE: %s:%s:%s:%u ", | |
338 | tablename, chainname, comment, rulenum); | |
339 | } | |
340 | #endif | |
341 | ||
1da177e4 LT |
342 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
343 | unsigned int | |
3db05fea | 344 | ip6t_do_table(struct sk_buff *skb, |
1da177e4 LT |
345 | unsigned int hook, |
346 | const struct net_device *in, | |
347 | const struct net_device *out, | |
fe1cb108 | 348 | struct xt_table *table) |
1da177e4 | 349 | { |
6b7d31fc | 350 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
351 | int offset = 0; |
352 | unsigned int protoff = 0; | |
cff533ac | 353 | bool hotdrop = false; |
1da177e4 LT |
354 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
355 | unsigned int verdict = NF_DROP; | |
356 | const char *indev, *outdev; | |
357 | void *table_base; | |
358 | struct ip6t_entry *e, *back; | |
2e4e6a17 | 359 | struct xt_table_info *private; |
1da177e4 LT |
360 | |
361 | /* Initialization */ | |
362 | indev = in ? in->name : nulldevname; | |
363 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
364 | /* We handle fragments by dealing with the first fragment as |
365 | * if it was a normal packet. All other fragments are treated | |
366 | * normally, except that they will NEVER match rules that ask | |
367 | * things we don't know, ie. tcp syn flag or ports). If the | |
368 | * rule is also a fragment-specific rule, non-fragments won't | |
369 | * match it. */ | |
370 | ||
371 | read_lock_bh(&table->lock); | |
2e4e6a17 | 372 | private = table->private; |
1da177e4 | 373 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
2e4e6a17 HW |
374 | table_base = (void *)private->entries[smp_processor_id()]; |
375 | e = get_entry(table_base, private->hook_entry[hook]); | |
1da177e4 | 376 | |
1da177e4 | 377 | /* For return from builtin chain */ |
2e4e6a17 | 378 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
379 | |
380 | do { | |
381 | IP_NF_ASSERT(e); | |
382 | IP_NF_ASSERT(back); | |
3db05fea | 383 | if (ip6_packet_match(skb, indev, outdev, &e->ipv6, |
51d8b1a6 | 384 | &protoff, &offset, &hotdrop)) { |
1da177e4 LT |
385 | struct ip6t_entry_target *t; |
386 | ||
387 | if (IP6T_MATCH_ITERATE(e, do_match, | |
3db05fea | 388 | skb, in, out, |
1da177e4 LT |
389 | offset, protoff, &hotdrop) != 0) |
390 | goto no_match; | |
391 | ||
392 | ADD_COUNTER(e->counters, | |
72f36ec1 PM |
393 | ntohs(ipv6_hdr(skb)->payload_len) + |
394 | sizeof(struct ipv6hdr), 1); | |
1da177e4 LT |
395 | |
396 | t = ip6t_get_target(e); | |
397 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
398 | |
399 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
400 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
401 | /* The packet is traced: log it */ | |
3db05fea HX |
402 | if (unlikely(skb->nf_trace)) |
403 | trace_packet(skb, hook, in, out, | |
ba9dda3a JK |
404 | table->name, private, e); |
405 | #endif | |
1da177e4 LT |
406 | /* Standard target? */ |
407 | if (!t->u.kernel.target->target) { | |
408 | int v; | |
409 | ||
410 | v = ((struct ip6t_standard_target *)t)->verdict; | |
411 | if (v < 0) { | |
412 | /* Pop from stack? */ | |
413 | if (v != IP6T_RETURN) { | |
414 | verdict = (unsigned)(-v) - 1; | |
415 | break; | |
416 | } | |
417 | e = back; | |
418 | back = get_entry(table_base, | |
419 | back->comefrom); | |
420 | continue; | |
421 | } | |
05465343 PM |
422 | if (table_base + v != (void *)e + e->next_offset |
423 | && !(e->ipv6.flags & IP6T_F_GOTO)) { | |
1da177e4 LT |
424 | /* Save old back ptr in next entry */ |
425 | struct ip6t_entry *next | |
426 | = (void *)e + e->next_offset; | |
427 | next->comefrom | |
428 | = (void *)back - table_base; | |
429 | /* set back pointer to next entry */ | |
430 | back = next; | |
431 | } | |
432 | ||
433 | e = get_entry(table_base, v); | |
434 | } else { | |
435 | /* Targets which reenter must return | |
1ab1457c | 436 | abs. verdicts */ |
1da177e4 LT |
437 | #ifdef CONFIG_NETFILTER_DEBUG |
438 | ((struct ip6t_entry *)table_base)->comefrom | |
439 | = 0xeeeeeeec; | |
440 | #endif | |
3db05fea | 441 | verdict = t->u.kernel.target->target(skb, |
1da177e4 LT |
442 | in, out, |
443 | hook, | |
1c524830 | 444 | t->u.kernel.target, |
fe1cb108 | 445 | t->data); |
1da177e4 LT |
446 | |
447 | #ifdef CONFIG_NETFILTER_DEBUG | |
448 | if (((struct ip6t_entry *)table_base)->comefrom | |
449 | != 0xeeeeeeec | |
450 | && verdict == IP6T_CONTINUE) { | |
451 | printk("Target %s reentered!\n", | |
452 | t->u.kernel.target->name); | |
453 | verdict = NF_DROP; | |
454 | } | |
455 | ((struct ip6t_entry *)table_base)->comefrom | |
456 | = 0x57acc001; | |
457 | #endif | |
458 | if (verdict == IP6T_CONTINUE) | |
459 | e = (void *)e + e->next_offset; | |
460 | else | |
461 | /* Verdict */ | |
462 | break; | |
463 | } | |
464 | } else { | |
465 | ||
466 | no_match: | |
467 | e = (void *)e + e->next_offset; | |
468 | } | |
469 | } while (!hotdrop); | |
470 | ||
471 | #ifdef CONFIG_NETFILTER_DEBUG | |
4bdbf6c0 | 472 | ((struct ip6t_entry *)table_base)->comefrom = NETFILTER_LINK_POISON; |
1da177e4 LT |
473 | #endif |
474 | read_unlock_bh(&table->lock); | |
475 | ||
476 | #ifdef DEBUG_ALLOW_ALL | |
477 | return NF_ACCEPT; | |
478 | #else | |
479 | if (hotdrop) | |
480 | return NF_DROP; | |
481 | else return verdict; | |
482 | #endif | |
483 | } | |
484 | ||
1da177e4 LT |
485 | /* Figures out from what hook each rule can be called: returns 0 if |
486 | there are loops. Puts hook bitmask in comefrom. */ | |
487 | static int | |
2e4e6a17 | 488 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 489 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
490 | { |
491 | unsigned int hook; | |
492 | ||
493 | /* No recursion; use packet counter to save back ptrs (reset | |
494 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 495 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 LT |
496 | unsigned int pos = newinfo->hook_entry[hook]; |
497 | struct ip6t_entry *e | |
31836064 | 498 | = (struct ip6t_entry *)(entry0 + pos); |
e1b4b9f3 | 499 | int visited = e->comefrom & (1 << hook); |
1da177e4 LT |
500 | |
501 | if (!(valid_hooks & (1 << hook))) | |
502 | continue; | |
503 | ||
504 | /* Set initial back pointer. */ | |
505 | e->counters.pcnt = pos; | |
506 | ||
507 | for (;;) { | |
508 | struct ip6t_standard_target *t | |
509 | = (void *)ip6t_get_target(e); | |
510 | ||
6e23ae2a | 511 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
512 | printk("iptables: loop hook %u pos %u %08X.\n", |
513 | hook, pos, e->comefrom); | |
514 | return 0; | |
515 | } | |
516 | e->comefrom | |
6e23ae2a | 517 | |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
518 | |
519 | /* Unconditional return/END. */ | |
e1b4b9f3 | 520 | if ((e->target_offset == sizeof(struct ip6t_entry) |
1da177e4 LT |
521 | && (strcmp(t->target.u.user.name, |
522 | IP6T_STANDARD_TARGET) == 0) | |
523 | && t->verdict < 0 | |
e1b4b9f3 | 524 | && unconditional(&e->ipv6)) || visited) { |
1da177e4 LT |
525 | unsigned int oldpos, size; |
526 | ||
74c9c0c1 DM |
527 | if (t->verdict < -NF_MAX_VERDICT - 1) { |
528 | duprintf("mark_source_chains: bad " | |
529 | "negative verdict (%i)\n", | |
530 | t->verdict); | |
531 | return 0; | |
532 | } | |
533 | ||
1da177e4 LT |
534 | /* Return: backtrack through the last |
535 | big jump. */ | |
536 | do { | |
6e23ae2a | 537 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
538 | #ifdef DEBUG_IP_FIREWALL_USER |
539 | if (e->comefrom | |
6e23ae2a | 540 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
541 | duprintf("Back unset " |
542 | "on hook %u " | |
543 | "rule %u\n", | |
544 | hook, pos); | |
545 | } | |
546 | #endif | |
547 | oldpos = pos; | |
548 | pos = e->counters.pcnt; | |
549 | e->counters.pcnt = 0; | |
550 | ||
551 | /* We're at the start. */ | |
552 | if (pos == oldpos) | |
553 | goto next; | |
554 | ||
555 | e = (struct ip6t_entry *) | |
31836064 | 556 | (entry0 + pos); |
1da177e4 LT |
557 | } while (oldpos == pos + e->next_offset); |
558 | ||
559 | /* Move along one */ | |
560 | size = e->next_offset; | |
561 | e = (struct ip6t_entry *) | |
31836064 | 562 | (entry0 + pos + size); |
1da177e4 LT |
563 | e->counters.pcnt = pos; |
564 | pos += size; | |
565 | } else { | |
566 | int newpos = t->verdict; | |
567 | ||
568 | if (strcmp(t->target.u.user.name, | |
569 | IP6T_STANDARD_TARGET) == 0 | |
570 | && newpos >= 0) { | |
74c9c0c1 DM |
571 | if (newpos > newinfo->size - |
572 | sizeof(struct ip6t_entry)) { | |
573 | duprintf("mark_source_chains: " | |
574 | "bad verdict (%i)\n", | |
575 | newpos); | |
576 | return 0; | |
577 | } | |
1da177e4 LT |
578 | /* This a jump; chase it. */ |
579 | duprintf("Jump rule %u -> %u\n", | |
580 | pos, newpos); | |
581 | } else { | |
582 | /* ... this is a fallthru */ | |
583 | newpos = pos + e->next_offset; | |
584 | } | |
585 | e = (struct ip6t_entry *) | |
31836064 | 586 | (entry0 + newpos); |
1da177e4 LT |
587 | e->counters.pcnt = pos; |
588 | pos = newpos; | |
589 | } | |
590 | } | |
591 | next: | |
592 | duprintf("Finished chain %u\n", hook); | |
593 | } | |
594 | return 1; | |
595 | } | |
596 | ||
597 | static inline int | |
598 | cleanup_match(struct ip6t_entry_match *m, unsigned int *i) | |
599 | { | |
600 | if (i && (*i)-- == 0) | |
601 | return 1; | |
602 | ||
603 | if (m->u.kernel.match->destroy) | |
efa74165 | 604 | m->u.kernel.match->destroy(m->u.kernel.match, m->data); |
1da177e4 LT |
605 | module_put(m->u.kernel.match->me); |
606 | return 0; | |
607 | } | |
608 | ||
1da177e4 | 609 | static inline int |
f173c8a1 PM |
610 | check_entry(struct ip6t_entry *e, const char *name) |
611 | { | |
612 | struct ip6t_entry_target *t; | |
613 | ||
614 | if (!ip6_checkentry(&e->ipv6)) { | |
615 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
616 | return -EINVAL; | |
617 | } | |
618 | ||
619 | if (e->target_offset + sizeof(struct ip6t_entry_target) > | |
620 | e->next_offset) | |
621 | return -EINVAL; | |
622 | ||
623 | t = ip6t_get_target(e); | |
624 | if (e->target_offset + t->u.target_size > e->next_offset) | |
625 | return -EINVAL; | |
626 | ||
627 | return 0; | |
628 | } | |
629 | ||
630 | static inline int check_match(struct ip6t_entry_match *m, const char *name, | |
631 | const struct ip6t_ip6 *ipv6, | |
632 | unsigned int hookmask, unsigned int *i) | |
633 | { | |
634 | struct xt_match *match; | |
635 | int ret; | |
636 | ||
637 | match = m->u.kernel.match; | |
638 | ret = xt_check_match(match, AF_INET6, m->u.match_size - sizeof(*m), | |
639 | name, hookmask, ipv6->proto, | |
640 | ipv6->invflags & IP6T_INV_PROTO); | |
641 | if (!ret && m->u.kernel.match->checkentry | |
642 | && !m->u.kernel.match->checkentry(name, ipv6, match, m->data, | |
643 | hookmask)) { | |
644 | duprintf("ip_tables: check failed for `%s'.\n", | |
645 | m->u.kernel.match->name); | |
646 | ret = -EINVAL; | |
647 | } | |
648 | if (!ret) | |
649 | (*i)++; | |
650 | return ret; | |
651 | } | |
652 | ||
653 | static inline int | |
654 | find_check_match(struct ip6t_entry_match *m, | |
655 | const char *name, | |
656 | const struct ip6t_ip6 *ipv6, | |
657 | unsigned int hookmask, | |
658 | unsigned int *i) | |
1da177e4 | 659 | { |
6709dbbb | 660 | struct xt_match *match; |
3cdc7c95 | 661 | int ret; |
1da177e4 | 662 | |
2e4e6a17 | 663 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, |
1ab1457c | 664 | m->u.user.revision), |
6b7d31fc HW |
665 | "ip6t_%s", m->u.user.name); |
666 | if (IS_ERR(match) || !match) { | |
f173c8a1 | 667 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
6b7d31fc | 668 | return match ? PTR_ERR(match) : -ENOENT; |
1da177e4 LT |
669 | } |
670 | m->u.kernel.match = match; | |
1da177e4 | 671 | |
f173c8a1 | 672 | ret = check_match(m, name, ipv6, hookmask, i); |
3cdc7c95 PM |
673 | if (ret) |
674 | goto err; | |
675 | ||
1da177e4 | 676 | return 0; |
3cdc7c95 PM |
677 | err: |
678 | module_put(m->u.kernel.match->me); | |
679 | return ret; | |
1da177e4 LT |
680 | } |
681 | ||
f173c8a1 | 682 | static inline int check_target(struct ip6t_entry *e, const char *name) |
1da177e4 LT |
683 | { |
684 | struct ip6t_entry_target *t; | |
6709dbbb | 685 | struct xt_target *target; |
1da177e4 | 686 | int ret; |
1da177e4 | 687 | |
f173c8a1 PM |
688 | t = ip6t_get_target(e); |
689 | target = t->u.kernel.target; | |
690 | ret = xt_check_target(target, AF_INET6, t->u.target_size - sizeof(*t), | |
691 | name, e->comefrom, e->ipv6.proto, | |
692 | e->ipv6.invflags & IP6T_INV_PROTO); | |
693 | if (!ret && t->u.kernel.target->checkentry | |
694 | && !t->u.kernel.target->checkentry(name, e, target, t->data, | |
695 | e->comefrom)) { | |
696 | duprintf("ip_tables: check failed for `%s'.\n", | |
697 | t->u.kernel.target->name); | |
698 | ret = -EINVAL; | |
1da177e4 | 699 | } |
f173c8a1 PM |
700 | return ret; |
701 | } | |
1da177e4 | 702 | |
f173c8a1 PM |
703 | static inline int |
704 | find_check_entry(struct ip6t_entry *e, const char *name, unsigned int size, | |
705 | unsigned int *i) | |
706 | { | |
707 | struct ip6t_entry_target *t; | |
708 | struct xt_target *target; | |
709 | int ret; | |
710 | unsigned int j; | |
711 | ||
712 | ret = check_entry(e, name); | |
713 | if (ret) | |
714 | return ret; | |
590bdf7f | 715 | |
1da177e4 | 716 | j = 0; |
f173c8a1 PM |
717 | ret = IP6T_MATCH_ITERATE(e, find_check_match, name, &e->ipv6, |
718 | e->comefrom, &j); | |
1da177e4 LT |
719 | if (ret != 0) |
720 | goto cleanup_matches; | |
721 | ||
722 | t = ip6t_get_target(e); | |
2e4e6a17 HW |
723 | target = try_then_request_module(xt_find_target(AF_INET6, |
724 | t->u.user.name, | |
725 | t->u.user.revision), | |
6b7d31fc HW |
726 | "ip6t_%s", t->u.user.name); |
727 | if (IS_ERR(target) || !target) { | |
f173c8a1 | 728 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
6b7d31fc | 729 | ret = target ? PTR_ERR(target) : -ENOENT; |
1da177e4 LT |
730 | goto cleanup_matches; |
731 | } | |
732 | t->u.kernel.target = target; | |
6b7d31fc | 733 | |
f173c8a1 | 734 | ret = check_target(e, name); |
3cdc7c95 PM |
735 | if (ret) |
736 | goto err; | |
737 | ||
1da177e4 LT |
738 | (*i)++; |
739 | return 0; | |
3cdc7c95 PM |
740 | err: |
741 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
742 | cleanup_matches: |
743 | IP6T_MATCH_ITERATE(e, cleanup_match, &j); | |
744 | return ret; | |
745 | } | |
746 | ||
747 | static inline int | |
748 | check_entry_size_and_hooks(struct ip6t_entry *e, | |
2e4e6a17 | 749 | struct xt_table_info *newinfo, |
1da177e4 LT |
750 | unsigned char *base, |
751 | unsigned char *limit, | |
752 | const unsigned int *hook_entries, | |
753 | const unsigned int *underflows, | |
754 | unsigned int *i) | |
755 | { | |
756 | unsigned int h; | |
757 | ||
758 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 | |
759 | || (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
760 | duprintf("Bad offset %p\n", e); | |
761 | return -EINVAL; | |
762 | } | |
763 | ||
764 | if (e->next_offset | |
765 | < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) { | |
766 | duprintf("checking: element %p size %u\n", | |
767 | e, e->next_offset); | |
768 | return -EINVAL; | |
769 | } | |
770 | ||
771 | /* Check hooks & underflows */ | |
6e23ae2a | 772 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
1da177e4 LT |
773 | if ((unsigned char *)e - base == hook_entries[h]) |
774 | newinfo->hook_entry[h] = hook_entries[h]; | |
775 | if ((unsigned char *)e - base == underflows[h]) | |
776 | newinfo->underflow[h] = underflows[h]; | |
777 | } | |
778 | ||
779 | /* FIXME: underflows must be unconditional, standard verdicts | |
1ab1457c | 780 | < 0 (not IP6T_RETURN). --RR */ |
1da177e4 LT |
781 | |
782 | /* Clear counters and comefrom */ | |
2e4e6a17 | 783 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
784 | e->comefrom = 0; |
785 | ||
786 | (*i)++; | |
787 | return 0; | |
788 | } | |
789 | ||
790 | static inline int | |
791 | cleanup_entry(struct ip6t_entry *e, unsigned int *i) | |
792 | { | |
793 | struct ip6t_entry_target *t; | |
794 | ||
795 | if (i && (*i)-- == 0) | |
796 | return 1; | |
797 | ||
798 | /* Cleanup all matches */ | |
799 | IP6T_MATCH_ITERATE(e, cleanup_match, NULL); | |
800 | t = ip6t_get_target(e); | |
801 | if (t->u.kernel.target->destroy) | |
efa74165 | 802 | t->u.kernel.target->destroy(t->u.kernel.target, t->data); |
1da177e4 LT |
803 | module_put(t->u.kernel.target->me); |
804 | return 0; | |
805 | } | |
806 | ||
807 | /* Checks and translates the user-supplied table segment (held in | |
808 | newinfo) */ | |
809 | static int | |
810 | translate_table(const char *name, | |
811 | unsigned int valid_hooks, | |
2e4e6a17 | 812 | struct xt_table_info *newinfo, |
31836064 | 813 | void *entry0, |
1da177e4 LT |
814 | unsigned int size, |
815 | unsigned int number, | |
816 | const unsigned int *hook_entries, | |
817 | const unsigned int *underflows) | |
818 | { | |
819 | unsigned int i; | |
820 | int ret; | |
821 | ||
822 | newinfo->size = size; | |
823 | newinfo->number = number; | |
824 | ||
825 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 826 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
827 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
828 | newinfo->underflow[i] = 0xFFFFFFFF; | |
829 | } | |
830 | ||
831 | duprintf("translate_table: size %u\n", newinfo->size); | |
832 | i = 0; | |
833 | /* Walk through entries, checking offsets. */ | |
31836064 | 834 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
835 | check_entry_size_and_hooks, |
836 | newinfo, | |
31836064 ED |
837 | entry0, |
838 | entry0 + size, | |
1da177e4 LT |
839 | hook_entries, underflows, &i); |
840 | if (ret != 0) | |
841 | return ret; | |
842 | ||
843 | if (i != number) { | |
844 | duprintf("translate_table: %u not %u entries\n", | |
845 | i, number); | |
846 | return -EINVAL; | |
847 | } | |
848 | ||
849 | /* Check hooks all assigned */ | |
6e23ae2a | 850 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
851 | /* Only hooks which are valid */ |
852 | if (!(valid_hooks & (1 << i))) | |
853 | continue; | |
854 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
855 | duprintf("Invalid hook entry %u %u\n", | |
856 | i, hook_entries[i]); | |
857 | return -EINVAL; | |
858 | } | |
859 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
860 | duprintf("Invalid underflow %u %u\n", | |
861 | i, underflows[i]); | |
862 | return -EINVAL; | |
863 | } | |
864 | } | |
865 | ||
74c9c0c1 DM |
866 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
867 | return -ELOOP; | |
868 | ||
1da177e4 LT |
869 | /* Finally, each sanity check must pass */ |
870 | i = 0; | |
31836064 | 871 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
f173c8a1 | 872 | find_check_entry, name, size, &i); |
1da177e4 | 873 | |
74c9c0c1 DM |
874 | if (ret != 0) { |
875 | IP6T_ENTRY_ITERATE(entry0, newinfo->size, | |
876 | cleanup_entry, &i); | |
877 | return ret; | |
878 | } | |
1da177e4 LT |
879 | |
880 | /* And one copy for every other CPU */ | |
6f912042 | 881 | for_each_possible_cpu(i) { |
31836064 ED |
882 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
883 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
884 | } |
885 | ||
590bdf7f | 886 | return 0; |
1da177e4 LT |
887 | } |
888 | ||
1da177e4 LT |
889 | /* Gets counters. */ |
890 | static inline int | |
891 | add_entry_to_counter(const struct ip6t_entry *e, | |
2e4e6a17 | 892 | struct xt_counters total[], |
1da177e4 LT |
893 | unsigned int *i) |
894 | { | |
895 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
896 | ||
897 | (*i)++; | |
898 | return 0; | |
899 | } | |
900 | ||
31836064 ED |
901 | static inline int |
902 | set_entry_to_counter(const struct ip6t_entry *e, | |
903 | struct ip6t_counters total[], | |
904 | unsigned int *i) | |
905 | { | |
906 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
907 | ||
908 | (*i)++; | |
909 | return 0; | |
910 | } | |
911 | ||
1da177e4 | 912 | static void |
2e4e6a17 HW |
913 | get_counters(const struct xt_table_info *t, |
914 | struct xt_counters counters[]) | |
1da177e4 LT |
915 | { |
916 | unsigned int cpu; | |
917 | unsigned int i; | |
31836064 ED |
918 | unsigned int curcpu; |
919 | ||
920 | /* Instead of clearing (by a previous call to memset()) | |
921 | * the counters and using adds, we set the counters | |
922 | * with data used by 'current' CPU | |
923 | * We dont care about preemption here. | |
924 | */ | |
925 | curcpu = raw_smp_processor_id(); | |
926 | ||
927 | i = 0; | |
928 | IP6T_ENTRY_ITERATE(t->entries[curcpu], | |
929 | t->size, | |
930 | set_entry_to_counter, | |
931 | counters, | |
932 | &i); | |
1da177e4 | 933 | |
6f912042 | 934 | for_each_possible_cpu(cpu) { |
31836064 ED |
935 | if (cpu == curcpu) |
936 | continue; | |
1da177e4 | 937 | i = 0; |
31836064 | 938 | IP6T_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
939 | t->size, |
940 | add_entry_to_counter, | |
941 | counters, | |
942 | &i); | |
943 | } | |
944 | } | |
945 | ||
ed1a6f5e | 946 | static inline struct xt_counters *alloc_counters(struct xt_table *table) |
1da177e4 | 947 | { |
ed1a6f5e | 948 | unsigned int countersize; |
2e4e6a17 HW |
949 | struct xt_counters *counters; |
950 | struct xt_table_info *private = table->private; | |
1da177e4 LT |
951 | |
952 | /* We need atomic snapshot of counters: rest doesn't change | |
953 | (other than comefrom, which userspace doesn't care | |
954 | about). */ | |
2e4e6a17 | 955 | countersize = sizeof(struct xt_counters) * private->number; |
3b84e92b | 956 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
957 | |
958 | if (counters == NULL) | |
ed1a6f5e | 959 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
960 | |
961 | /* First, sum counters... */ | |
1da177e4 | 962 | write_lock_bh(&table->lock); |
2e4e6a17 | 963 | get_counters(private, counters); |
1da177e4 LT |
964 | write_unlock_bh(&table->lock); |
965 | ||
ed1a6f5e PM |
966 | return counters; |
967 | } | |
968 | ||
969 | static int | |
970 | copy_entries_to_user(unsigned int total_size, | |
971 | struct xt_table *table, | |
972 | void __user *userptr) | |
973 | { | |
974 | unsigned int off, num; | |
975 | struct ip6t_entry *e; | |
976 | struct xt_counters *counters; | |
977 | struct xt_table_info *private = table->private; | |
978 | int ret = 0; | |
979 | void *loc_cpu_entry; | |
980 | ||
981 | counters = alloc_counters(table); | |
982 | if (IS_ERR(counters)) | |
983 | return PTR_ERR(counters); | |
984 | ||
31836064 | 985 | /* choose the copy that is on ourc node/cpu */ |
2e4e6a17 | 986 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 987 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
988 | ret = -EFAULT; |
989 | goto free_counters; | |
990 | } | |
991 | ||
992 | /* FIXME: use iterator macros --RR */ | |
993 | /* ... then go back and fix counters and names */ | |
994 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
995 | unsigned int i; | |
996 | struct ip6t_entry_match *m; | |
997 | struct ip6t_entry_target *t; | |
998 | ||
31836064 | 999 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
1000 | if (copy_to_user(userptr + off |
1001 | + offsetof(struct ip6t_entry, counters), | |
1002 | &counters[num], | |
1003 | sizeof(counters[num])) != 0) { | |
1004 | ret = -EFAULT; | |
1005 | goto free_counters; | |
1006 | } | |
1007 | ||
1008 | for (i = sizeof(struct ip6t_entry); | |
1009 | i < e->target_offset; | |
1010 | i += m->u.match_size) { | |
1011 | m = (void *)e + i; | |
1012 | ||
1013 | if (copy_to_user(userptr + off + i | |
1014 | + offsetof(struct ip6t_entry_match, | |
1015 | u.user.name), | |
1016 | m->u.kernel.match->name, | |
1017 | strlen(m->u.kernel.match->name)+1) | |
1018 | != 0) { | |
1019 | ret = -EFAULT; | |
1020 | goto free_counters; | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | t = ip6t_get_target(e); | |
1025 | if (copy_to_user(userptr + off + e->target_offset | |
1026 | + offsetof(struct ip6t_entry_target, | |
1027 | u.user.name), | |
1028 | t->u.kernel.target->name, | |
1029 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1030 | ret = -EFAULT; | |
1031 | goto free_counters; | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | free_counters: | |
1036 | vfree(counters); | |
1037 | return ret; | |
1038 | } | |
1039 | ||
1040 | static int | |
1041 | get_entries(const struct ip6t_get_entries *entries, | |
1042 | struct ip6t_get_entries __user *uptr) | |
1043 | { | |
1044 | int ret; | |
2e4e6a17 | 1045 | struct xt_table *t; |
1da177e4 | 1046 | |
2e4e6a17 | 1047 | t = xt_find_table_lock(AF_INET6, entries->name); |
6b7d31fc | 1048 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
1049 | struct xt_table_info *private = t->private; |
1050 | duprintf("t->private->number = %u\n", private->number); | |
1051 | if (entries->size == private->size) | |
1052 | ret = copy_entries_to_user(private->size, | |
1da177e4 LT |
1053 | t, uptr->entrytable); |
1054 | else { | |
1055 | duprintf("get_entries: I've got %u not %u!\n", | |
2e4e6a17 | 1056 | private->size, entries->size); |
1da177e4 LT |
1057 | ret = -EINVAL; |
1058 | } | |
6b7d31fc | 1059 | module_put(t->me); |
2e4e6a17 | 1060 | xt_table_unlock(t); |
1da177e4 | 1061 | } else |
6b7d31fc | 1062 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1063 | |
1064 | return ret; | |
1065 | } | |
1066 | ||
1067 | static int | |
1068 | do_replace(void __user *user, unsigned int len) | |
1069 | { | |
1070 | int ret; | |
1071 | struct ip6t_replace tmp; | |
2e4e6a17 HW |
1072 | struct xt_table *t; |
1073 | struct xt_table_info *newinfo, *oldinfo; | |
1074 | struct xt_counters *counters; | |
31836064 | 1075 | void *loc_cpu_entry, *loc_cpu_old_entry; |
1da177e4 LT |
1076 | |
1077 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1078 | return -EFAULT; | |
1079 | ||
ee4bb818 | 1080 | /* overflow check */ |
ee4bb818 KK |
1081 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1082 | return -ENOMEM; | |
1083 | ||
2e4e6a17 | 1084 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1085 | if (!newinfo) |
1086 | return -ENOMEM; | |
1087 | ||
31836064 ED |
1088 | /* choose the copy that is on our node/cpu */ |
1089 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1090 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1091 | tmp.size) != 0) { |
1092 | ret = -EFAULT; | |
1093 | goto free_newinfo; | |
1094 | } | |
1095 | ||
3b84e92b PM |
1096 | counters = vmalloc_node(tmp.num_counters * sizeof(struct xt_counters), |
1097 | numa_node_id()); | |
1da177e4 LT |
1098 | if (!counters) { |
1099 | ret = -ENOMEM; | |
1100 | goto free_newinfo; | |
1101 | } | |
1da177e4 LT |
1102 | |
1103 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
31836064 | 1104 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, |
1da177e4 LT |
1105 | tmp.hook_entry, tmp.underflow); |
1106 | if (ret != 0) | |
1107 | goto free_newinfo_counters; | |
1108 | ||
1109 | duprintf("ip_tables: Translated table\n"); | |
1110 | ||
2e4e6a17 | 1111 | t = try_then_request_module(xt_find_table_lock(AF_INET6, tmp.name), |
6b7d31fc HW |
1112 | "ip6table_%s", tmp.name); |
1113 | if (!t || IS_ERR(t)) { | |
1114 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1115 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1116 | } |
1da177e4 LT |
1117 | |
1118 | /* You lied! */ | |
1119 | if (tmp.valid_hooks != t->valid_hooks) { | |
1120 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1121 | tmp.valid_hooks, t->valid_hooks); | |
1122 | ret = -EINVAL; | |
6b7d31fc | 1123 | goto put_module; |
1da177e4 LT |
1124 | } |
1125 | ||
2e4e6a17 | 1126 | oldinfo = xt_replace_table(t, tmp.num_counters, newinfo, &ret); |
1da177e4 LT |
1127 | if (!oldinfo) |
1128 | goto put_module; | |
1129 | ||
1130 | /* Update module usage count based on number of rules */ | |
1131 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1132 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1133 | if ((oldinfo->number > oldinfo->initial_entries) || |
1134 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1135 | module_put(t->me); |
1136 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1137 | (newinfo->number <= oldinfo->initial_entries)) | |
1138 | module_put(t->me); | |
1139 | ||
1140 | /* Get the old counters. */ | |
1141 | get_counters(oldinfo, counters); | |
1142 | /* Decrease module usage counts and free resource */ | |
31836064 ED |
1143 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
1144 | IP6T_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL); | |
2e4e6a17 | 1145 | xt_free_table_info(oldinfo); |
1da177e4 | 1146 | if (copy_to_user(tmp.counters, counters, |
2e4e6a17 | 1147 | sizeof(struct xt_counters) * tmp.num_counters) != 0) |
1da177e4 LT |
1148 | ret = -EFAULT; |
1149 | vfree(counters); | |
2e4e6a17 | 1150 | xt_table_unlock(t); |
1da177e4 LT |
1151 | return ret; |
1152 | ||
1153 | put_module: | |
1154 | module_put(t->me); | |
2e4e6a17 | 1155 | xt_table_unlock(t); |
1da177e4 | 1156 | free_newinfo_counters_untrans: |
31836064 | 1157 | IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL); |
1da177e4 LT |
1158 | free_newinfo_counters: |
1159 | vfree(counters); | |
1160 | free_newinfo: | |
2e4e6a17 | 1161 | xt_free_table_info(newinfo); |
1da177e4 LT |
1162 | return ret; |
1163 | } | |
1164 | ||
1165 | /* We're lazy, and add to the first CPU; overflow works its fey magic | |
1166 | * and everything is OK. */ | |
1167 | static inline int | |
1168 | add_counter_to_entry(struct ip6t_entry *e, | |
2e4e6a17 | 1169 | const struct xt_counters addme[], |
1da177e4 LT |
1170 | unsigned int *i) |
1171 | { | |
1172 | #if 0 | |
1173 | duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n", | |
1174 | *i, | |
1175 | (long unsigned int)e->counters.pcnt, | |
1176 | (long unsigned int)e->counters.bcnt, | |
1177 | (long unsigned int)addme[*i].pcnt, | |
1178 | (long unsigned int)addme[*i].bcnt); | |
1179 | #endif | |
1180 | ||
1181 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1182 | ||
1183 | (*i)++; | |
1184 | return 0; | |
1185 | } | |
1186 | ||
1187 | static int | |
1188 | do_add_counters(void __user *user, unsigned int len) | |
1189 | { | |
1190 | unsigned int i; | |
2e4e6a17 HW |
1191 | struct xt_counters_info tmp, *paddc; |
1192 | struct xt_table_info *private; | |
1193 | struct xt_table *t; | |
6b7d31fc | 1194 | int ret = 0; |
31836064 | 1195 | void *loc_cpu_entry; |
1da177e4 LT |
1196 | |
1197 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1198 | return -EFAULT; | |
1199 | ||
2e4e6a17 | 1200 | if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct xt_counters)) |
1da177e4 LT |
1201 | return -EINVAL; |
1202 | ||
3b84e92b | 1203 | paddc = vmalloc_node(len, numa_node_id()); |
1da177e4 LT |
1204 | if (!paddc) |
1205 | return -ENOMEM; | |
1206 | ||
1207 | if (copy_from_user(paddc, user, len) != 0) { | |
1208 | ret = -EFAULT; | |
1209 | goto free; | |
1210 | } | |
1211 | ||
2e4e6a17 | 1212 | t = xt_find_table_lock(AF_INET6, tmp.name); |
6b7d31fc HW |
1213 | if (!t || IS_ERR(t)) { |
1214 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1215 | goto free; |
6b7d31fc | 1216 | } |
1da177e4 LT |
1217 | |
1218 | write_lock_bh(&t->lock); | |
2e4e6a17 | 1219 | private = t->private; |
2c8ac66b | 1220 | if (private->number != tmp.num_counters) { |
1da177e4 LT |
1221 | ret = -EINVAL; |
1222 | goto unlock_up_free; | |
1223 | } | |
1224 | ||
1225 | i = 0; | |
31836064 | 1226 | /* Choose the copy that is on our node */ |
2e4e6a17 | 1227 | loc_cpu_entry = private->entries[smp_processor_id()]; |
31836064 | 1228 | IP6T_ENTRY_ITERATE(loc_cpu_entry, |
2e4e6a17 | 1229 | private->size, |
1da177e4 LT |
1230 | add_counter_to_entry, |
1231 | paddc->counters, | |
1232 | &i); | |
1233 | unlock_up_free: | |
1234 | write_unlock_bh(&t->lock); | |
2e4e6a17 | 1235 | xt_table_unlock(t); |
6b7d31fc | 1236 | module_put(t->me); |
1da177e4 LT |
1237 | free: |
1238 | vfree(paddc); | |
1239 | ||
1240 | return ret; | |
1241 | } | |
1242 | ||
1243 | static int | |
1244 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
1245 | { | |
1246 | int ret; | |
1247 | ||
1248 | if (!capable(CAP_NET_ADMIN)) | |
1249 | return -EPERM; | |
1250 | ||
1251 | switch (cmd) { | |
1252 | case IP6T_SO_SET_REPLACE: | |
1253 | ret = do_replace(user, len); | |
1254 | break; | |
1255 | ||
1256 | case IP6T_SO_SET_ADD_COUNTERS: | |
1257 | ret = do_add_counters(user, len); | |
1258 | break; | |
1259 | ||
1260 | default: | |
1261 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1262 | ret = -EINVAL; | |
1263 | } | |
1264 | ||
1265 | return ret; | |
1266 | } | |
1267 | ||
1268 | static int | |
1269 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1270 | { | |
1271 | int ret; | |
1272 | ||
1273 | if (!capable(CAP_NET_ADMIN)) | |
1274 | return -EPERM; | |
1275 | ||
1276 | switch (cmd) { | |
1277 | case IP6T_SO_GET_INFO: { | |
1278 | char name[IP6T_TABLE_MAXNAMELEN]; | |
2e4e6a17 | 1279 | struct xt_table *t; |
1da177e4 LT |
1280 | |
1281 | if (*len != sizeof(struct ip6t_getinfo)) { | |
1282 | duprintf("length %u != %u\n", *len, | |
1283 | sizeof(struct ip6t_getinfo)); | |
1284 | ret = -EINVAL; | |
1285 | break; | |
1286 | } | |
1287 | ||
1288 | if (copy_from_user(name, user, sizeof(name)) != 0) { | |
1289 | ret = -EFAULT; | |
1290 | break; | |
1291 | } | |
1292 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; | |
6b7d31fc | 1293 | |
2e4e6a17 | 1294 | t = try_then_request_module(xt_find_table_lock(AF_INET6, name), |
6b7d31fc HW |
1295 | "ip6table_%s", name); |
1296 | if (t && !IS_ERR(t)) { | |
1da177e4 | 1297 | struct ip6t_getinfo info; |
2e4e6a17 | 1298 | struct xt_table_info *private = t->private; |
1da177e4 LT |
1299 | |
1300 | info.valid_hooks = t->valid_hooks; | |
2e4e6a17 | 1301 | memcpy(info.hook_entry, private->hook_entry, |
1da177e4 | 1302 | sizeof(info.hook_entry)); |
2e4e6a17 | 1303 | memcpy(info.underflow, private->underflow, |
1da177e4 | 1304 | sizeof(info.underflow)); |
2e4e6a17 HW |
1305 | info.num_entries = private->number; |
1306 | info.size = private->size; | |
1da177e4 LT |
1307 | memcpy(info.name, name, sizeof(info.name)); |
1308 | ||
1309 | if (copy_to_user(user, &info, *len) != 0) | |
1310 | ret = -EFAULT; | |
1311 | else | |
1312 | ret = 0; | |
2e4e6a17 | 1313 | xt_table_unlock(t); |
6b7d31fc HW |
1314 | module_put(t->me); |
1315 | } else | |
1316 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 LT |
1317 | } |
1318 | break; | |
1319 | ||
1320 | case IP6T_SO_GET_ENTRIES: { | |
1321 | struct ip6t_get_entries get; | |
1322 | ||
1323 | if (*len < sizeof(get)) { | |
1324 | duprintf("get_entries: %u < %u\n", *len, sizeof(get)); | |
1325 | ret = -EINVAL; | |
1326 | } else if (copy_from_user(&get, user, sizeof(get)) != 0) { | |
1327 | ret = -EFAULT; | |
1328 | } else if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
1329 | duprintf("get_entries: %u != %u\n", *len, | |
1330 | sizeof(struct ip6t_get_entries) + get.size); | |
1331 | ret = -EINVAL; | |
1332 | } else | |
1333 | ret = get_entries(&get, user); | |
1334 | break; | |
1335 | } | |
1336 | ||
6b7d31fc HW |
1337 | case IP6T_SO_GET_REVISION_MATCH: |
1338 | case IP6T_SO_GET_REVISION_TARGET: { | |
1339 | struct ip6t_get_revision rev; | |
2e4e6a17 | 1340 | int target; |
6b7d31fc HW |
1341 | |
1342 | if (*len != sizeof(rev)) { | |
1343 | ret = -EINVAL; | |
1344 | break; | |
1345 | } | |
1346 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1347 | ret = -EFAULT; | |
1348 | break; | |
1349 | } | |
1350 | ||
1351 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 1352 | target = 1; |
6b7d31fc | 1353 | else |
2e4e6a17 | 1354 | target = 0; |
6b7d31fc | 1355 | |
2e4e6a17 HW |
1356 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
1357 | rev.revision, | |
1358 | target, &ret), | |
6b7d31fc HW |
1359 | "ip6t_%s", rev.name); |
1360 | break; | |
1361 | } | |
1362 | ||
1da177e4 LT |
1363 | default: |
1364 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
1365 | ret = -EINVAL; | |
1366 | } | |
1367 | ||
1368 | return ret; | |
1369 | } | |
1370 | ||
2e4e6a17 | 1371 | int ip6t_register_table(struct xt_table *table, |
1da177e4 LT |
1372 | const struct ip6t_replace *repl) |
1373 | { | |
1374 | int ret; | |
2e4e6a17 | 1375 | struct xt_table_info *newinfo; |
259d4e41 | 1376 | struct xt_table_info bootstrap |
1da177e4 | 1377 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 1378 | void *loc_cpu_entry; |
1da177e4 | 1379 | |
2e4e6a17 | 1380 | newinfo = xt_alloc_table_info(repl->size); |
1da177e4 LT |
1381 | if (!newinfo) |
1382 | return -ENOMEM; | |
1383 | ||
31836064 ED |
1384 | /* choose the copy on our node/cpu */ |
1385 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1386 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
1387 | |
1388 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 1389 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
1390 | repl->num_entries, |
1391 | repl->hook_entry, | |
1392 | repl->underflow); | |
1393 | if (ret != 0) { | |
2e4e6a17 | 1394 | xt_free_table_info(newinfo); |
1da177e4 LT |
1395 | return ret; |
1396 | } | |
1397 | ||
da298d3a PM |
1398 | ret = xt_register_table(table, &bootstrap, newinfo); |
1399 | if (ret != 0) { | |
2e4e6a17 | 1400 | xt_free_table_info(newinfo); |
1da177e4 LT |
1401 | return ret; |
1402 | } | |
1403 | ||
2e4e6a17 | 1404 | return 0; |
1da177e4 LT |
1405 | } |
1406 | ||
2e4e6a17 | 1407 | void ip6t_unregister_table(struct xt_table *table) |
1da177e4 | 1408 | { |
2e4e6a17 | 1409 | struct xt_table_info *private; |
31836064 ED |
1410 | void *loc_cpu_entry; |
1411 | ||
2e4e6a17 | 1412 | private = xt_unregister_table(table); |
1da177e4 LT |
1413 | |
1414 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
1415 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
1416 | IP6T_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
1417 | xt_free_table_info(private); | |
1da177e4 LT |
1418 | } |
1419 | ||
1420 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 1421 | static inline bool |
1da177e4 LT |
1422 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
1423 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 1424 | bool invert) |
1da177e4 LT |
1425 | { |
1426 | return (type == test_type && code >= min_code && code <= max_code) | |
1427 | ^ invert; | |
1428 | } | |
1429 | ||
1d93a9cb | 1430 | static bool |
1da177e4 LT |
1431 | icmp6_match(const struct sk_buff *skb, |
1432 | const struct net_device *in, | |
1433 | const struct net_device *out, | |
c4986734 | 1434 | const struct xt_match *match, |
1da177e4 LT |
1435 | const void *matchinfo, |
1436 | int offset, | |
1437 | unsigned int protoff, | |
cff533ac | 1438 | bool *hotdrop) |
1da177e4 LT |
1439 | { |
1440 | struct icmp6hdr _icmp, *ic; | |
1441 | const struct ip6t_icmp *icmpinfo = matchinfo; | |
1442 | ||
1443 | /* Must not be a fragment. */ | |
1444 | if (offset) | |
1d93a9cb | 1445 | return false; |
1da177e4 LT |
1446 | |
1447 | ic = skb_header_pointer(skb, protoff, sizeof(_icmp), &_icmp); | |
1448 | if (ic == NULL) { | |
1449 | /* We've been asked to examine this packet, and we | |
1450 | can't. Hence, no choice but to drop. */ | |
1451 | duprintf("Dropping evil ICMP tinygram.\n"); | |
cff533ac | 1452 | *hotdrop = true; |
1d93a9cb | 1453 | return false; |
1da177e4 LT |
1454 | } |
1455 | ||
1456 | return icmp6_type_code_match(icmpinfo->type, | |
1457 | icmpinfo->code[0], | |
1458 | icmpinfo->code[1], | |
1459 | ic->icmp6_type, ic->icmp6_code, | |
1460 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
1461 | } | |
1462 | ||
1463 | /* Called when user tries to insert an entry of this type. */ | |
ccb79bdc | 1464 | static bool |
1da177e4 | 1465 | icmp6_checkentry(const char *tablename, |
2e4e6a17 | 1466 | const void *entry, |
c4986734 | 1467 | const struct xt_match *match, |
1da177e4 | 1468 | void *matchinfo, |
1da177e4 LT |
1469 | unsigned int hook_mask) |
1470 | { | |
1471 | const struct ip6t_icmp *icmpinfo = matchinfo; | |
1472 | ||
7f939713 PM |
1473 | /* Must specify no unknown invflags */ |
1474 | return !(icmpinfo->invflags & ~IP6T_ICMP_INV); | |
1da177e4 LT |
1475 | } |
1476 | ||
1477 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 1478 | static struct xt_target ip6t_standard_target __read_mostly = { |
1da177e4 | 1479 | .name = IP6T_STANDARD_TARGET, |
7f939713 | 1480 | .targetsize = sizeof(int), |
a45049c5 | 1481 | .family = AF_INET6, |
1da177e4 LT |
1482 | }; |
1483 | ||
9f15c530 | 1484 | static struct xt_target ip6t_error_target __read_mostly = { |
1da177e4 LT |
1485 | .name = IP6T_ERROR_TARGET, |
1486 | .target = ip6t_error, | |
7f939713 | 1487 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, |
a45049c5 | 1488 | .family = AF_INET6, |
1da177e4 LT |
1489 | }; |
1490 | ||
1491 | static struct nf_sockopt_ops ip6t_sockopts = { | |
1492 | .pf = PF_INET6, | |
1493 | .set_optmin = IP6T_BASE_CTL, | |
1494 | .set_optmax = IP6T_SO_SET_MAX+1, | |
1495 | .set = do_ip6t_set_ctl, | |
1496 | .get_optmin = IP6T_BASE_CTL, | |
1497 | .get_optmax = IP6T_SO_GET_MAX+1, | |
1498 | .get = do_ip6t_get_ctl, | |
16fcec35 | 1499 | .owner = THIS_MODULE, |
1da177e4 LT |
1500 | }; |
1501 | ||
9f15c530 | 1502 | static struct xt_match icmp6_matchstruct __read_mostly = { |
1da177e4 LT |
1503 | .name = "icmp6", |
1504 | .match = &icmp6_match, | |
7f939713 PM |
1505 | .matchsize = sizeof(struct ip6t_icmp), |
1506 | .checkentry = icmp6_checkentry, | |
1507 | .proto = IPPROTO_ICMPV6, | |
a45049c5 | 1508 | .family = AF_INET6, |
1da177e4 LT |
1509 | }; |
1510 | ||
65b4b4e8 | 1511 | static int __init ip6_tables_init(void) |
1da177e4 LT |
1512 | { |
1513 | int ret; | |
1514 | ||
0eff66e6 PM |
1515 | ret = xt_proto_init(AF_INET6); |
1516 | if (ret < 0) | |
1517 | goto err1; | |
2e4e6a17 | 1518 | |
1da177e4 | 1519 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
1520 | ret = xt_register_target(&ip6t_standard_target); |
1521 | if (ret < 0) | |
1522 | goto err2; | |
1523 | ret = xt_register_target(&ip6t_error_target); | |
1524 | if (ret < 0) | |
1525 | goto err3; | |
1526 | ret = xt_register_match(&icmp6_matchstruct); | |
1527 | if (ret < 0) | |
1528 | goto err4; | |
1da177e4 LT |
1529 | |
1530 | /* Register setsockopt */ | |
1531 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
1532 | if (ret < 0) |
1533 | goto err5; | |
1da177e4 | 1534 | |
a887c1c1 | 1535 | printk(KERN_INFO "ip6_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 1536 | return 0; |
0eff66e6 PM |
1537 | |
1538 | err5: | |
1539 | xt_unregister_match(&icmp6_matchstruct); | |
1540 | err4: | |
1541 | xt_unregister_target(&ip6t_error_target); | |
1542 | err3: | |
1543 | xt_unregister_target(&ip6t_standard_target); | |
1544 | err2: | |
1545 | xt_proto_fini(AF_INET6); | |
1546 | err1: | |
1547 | return ret; | |
1da177e4 LT |
1548 | } |
1549 | ||
65b4b4e8 | 1550 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
1551 | { |
1552 | nf_unregister_sockopt(&ip6t_sockopts); | |
a45049c5 PNA |
1553 | xt_unregister_match(&icmp6_matchstruct); |
1554 | xt_unregister_target(&ip6t_error_target); | |
1555 | xt_unregister_target(&ip6t_standard_target); | |
2e4e6a17 | 1556 | xt_proto_fini(AF_INET6); |
1da177e4 LT |
1557 | } |
1558 | ||
e674d0f3 | 1559 | /* |
b777e0ce PM |
1560 | * find the offset to specified header or the protocol number of last header |
1561 | * if target < 0. "last header" is transport protocol header, ESP, or | |
1562 | * "No next header". | |
1563 | * | |
1564 | * If target header is found, its offset is set in *offset and return protocol | |
1565 | * number. Otherwise, return -1. | |
1566 | * | |
6d381634 PM |
1567 | * If the first fragment doesn't contain the final protocol header or |
1568 | * NEXTHDR_NONE it is considered invalid. | |
1569 | * | |
b777e0ce PM |
1570 | * Note that non-1st fragment is special case that "the protocol number |
1571 | * of last header" is "next header" field in Fragment header. In this case, | |
1572 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
1573 | * isn't NULL. | |
e674d0f3 | 1574 | * |
e674d0f3 | 1575 | */ |
b777e0ce PM |
1576 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
1577 | int target, unsigned short *fragoff) | |
e674d0f3 | 1578 | { |
6b88dd96 | 1579 | unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); |
0660e03f | 1580 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
e674d0f3 YK |
1581 | unsigned int len = skb->len - start; |
1582 | ||
b777e0ce PM |
1583 | if (fragoff) |
1584 | *fragoff = 0; | |
1585 | ||
e674d0f3 YK |
1586 | while (nexthdr != target) { |
1587 | struct ipv6_opt_hdr _hdr, *hp; | |
1588 | unsigned int hdrlen; | |
1589 | ||
b777e0ce PM |
1590 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
1591 | if (target < 0) | |
1592 | break; | |
6d381634 | 1593 | return -ENOENT; |
b777e0ce PM |
1594 | } |
1595 | ||
e674d0f3 YK |
1596 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
1597 | if (hp == NULL) | |
6d381634 | 1598 | return -EBADMSG; |
e674d0f3 | 1599 | if (nexthdr == NEXTHDR_FRAGMENT) { |
e69a4adc AV |
1600 | unsigned short _frag_off; |
1601 | __be16 *fp; | |
e674d0f3 YK |
1602 | fp = skb_header_pointer(skb, |
1603 | start+offsetof(struct frag_hdr, | |
1604 | frag_off), | |
1605 | sizeof(_frag_off), | |
1606 | &_frag_off); | |
1607 | if (fp == NULL) | |
6d381634 | 1608 | return -EBADMSG; |
e674d0f3 | 1609 | |
b777e0ce PM |
1610 | _frag_off = ntohs(*fp) & ~0x7; |
1611 | if (_frag_off) { | |
1612 | if (target < 0 && | |
1613 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
337dde79 | 1614 | hp->nexthdr == NEXTHDR_NONE)) { |
b777e0ce PM |
1615 | if (fragoff) |
1616 | *fragoff = _frag_off; | |
1617 | return hp->nexthdr; | |
1618 | } | |
6d381634 | 1619 | return -ENOENT; |
b777e0ce | 1620 | } |
e674d0f3 YK |
1621 | hdrlen = 8; |
1622 | } else if (nexthdr == NEXTHDR_AUTH) | |
1ab1457c | 1623 | hdrlen = (hp->hdrlen + 2) << 2; |
e674d0f3 | 1624 | else |
1ab1457c | 1625 | hdrlen = ipv6_optlen(hp); |
e674d0f3 YK |
1626 | |
1627 | nexthdr = hp->nexthdr; | |
1628 | len -= hdrlen; | |
1629 | start += hdrlen; | |
1630 | } | |
1631 | ||
1632 | *offset = start; | |
b777e0ce | 1633 | return nexthdr; |
e674d0f3 YK |
1634 | } |
1635 | ||
1da177e4 LT |
1636 | EXPORT_SYMBOL(ip6t_register_table); |
1637 | EXPORT_SYMBOL(ip6t_unregister_table); | |
1638 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 1639 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 1640 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 1641 | |
65b4b4e8 AM |
1642 | module_init(ip6_tables_init); |
1643 | module_exit(ip6_tables_fini); |