Commit | Line | Data |
---|---|---|
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. | |
10 | * | |
11 | * 19 Jan 2002 Harald Welte <laforge@gnumonks.org> | |
12 | * - increase module usage count as soon as we have rules inside | |
13 | * a table | |
14 | * 06 Jun 2002 Andras Kis-Szabo <kisza@sch.bme.hu> | |
15 | * - new extension header parser code | |
2e4e6a17 HW |
16 | * 15 Oct 2005 Harald Welte <laforge@netfilter.org> |
17 | * - Unification of {ip,ip6}_tables into x_tables | |
18 | * - Removed tcp and udp code, since it's not ipv6 specific | |
1da177e4 | 19 | */ |
4fc268d2 RD |
20 | |
21 | #include <linux/capability.h> | |
14c85021 | 22 | #include <linux/in.h> |
1da177e4 LT |
23 | #include <linux/skbuff.h> |
24 | #include <linux/kmod.h> | |
25 | #include <linux/vmalloc.h> | |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/module.h> | |
4bdbf6c0 | 28 | #include <linux/poison.h> |
1da177e4 | 29 | #include <linux/icmpv6.h> |
1da177e4 LT |
30 | #include <net/ipv6.h> |
31 | #include <asm/uaccess.h> | |
57b47a53 | 32 | #include <linux/mutex.h> |
1da177e4 | 33 | #include <linux/proc_fs.h> |
c8923c6b | 34 | #include <linux/cpumask.h> |
1da177e4 LT |
35 | |
36 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
2e4e6a17 | 37 | #include <linux/netfilter/x_tables.h> |
1da177e4 LT |
38 | |
39 | MODULE_LICENSE("GPL"); | |
40 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
41 | MODULE_DESCRIPTION("IPv6 packet filter"); | |
42 | ||
43 | #define IPV6_HDR_LEN (sizeof(struct ipv6hdr)) | |
44 | #define IPV6_OPTHDR_LEN (sizeof(struct ipv6_opt_hdr)) | |
45 | ||
46 | /*#define DEBUG_IP_FIREWALL*/ | |
47 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
48 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
49 | ||
50 | #ifdef DEBUG_IP_FIREWALL | |
51 | #define dprintf(format, args...) printk(format , ## args) | |
52 | #else | |
53 | #define dprintf(format, args...) | |
54 | #endif | |
55 | ||
56 | #ifdef DEBUG_IP_FIREWALL_USER | |
57 | #define duprintf(format, args...) printk(format , ## args) | |
58 | #else | |
59 | #define duprintf(format, args...) | |
60 | #endif | |
61 | ||
62 | #ifdef CONFIG_NETFILTER_DEBUG | |
63 | #define IP_NF_ASSERT(x) \ | |
64 | do { \ | |
65 | if (!(x)) \ | |
66 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ | |
67 | __FUNCTION__, __FILE__, __LINE__); \ | |
68 | } while(0) | |
69 | #else | |
70 | #define IP_NF_ASSERT(x) | |
71 | #endif | |
1da177e4 | 72 | |
1da177e4 | 73 | |
1da177e4 LT |
74 | #include <linux/netfilter_ipv4/listhelp.h> |
75 | ||
76 | #if 0 | |
77 | /* All the better to debug you with... */ | |
78 | #define static | |
79 | #define inline | |
80 | #endif | |
81 | ||
6b7d31fc | 82 | /* |
1da177e4 | 83 | We keep a set of rules for each CPU, so we can avoid write-locking |
6b7d31fc HW |
84 | them in the softirq when updating the counters and therefore |
85 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
86 | context stops packets coming through and allows user context to read | |
87 | the counters or update the rules. | |
1da177e4 | 88 | |
1da177e4 LT |
89 | Hence the start of any table is given by get_table() below. */ |
90 | ||
1da177e4 LT |
91 | #if 0 |
92 | #define down(x) do { printk("DOWN:%u:" #x "\n", __LINE__); down(x); } while(0) | |
93 | #define down_interruptible(x) ({ int __r; printk("DOWNi:%u:" #x "\n", __LINE__); __r = down_interruptible(x); if (__r != 0) printk("ABORT-DOWNi:%u\n", __LINE__); __r; }) | |
94 | #define up(x) do { printk("UP:%u:" #x "\n", __LINE__); up(x); } while(0) | |
95 | #endif | |
96 | ||
1da177e4 LT |
97 | /* Check for an extension */ |
98 | int | |
99 | ip6t_ext_hdr(u8 nexthdr) | |
100 | { | |
101 | return ( (nexthdr == IPPROTO_HOPOPTS) || | |
102 | (nexthdr == IPPROTO_ROUTING) || | |
103 | (nexthdr == IPPROTO_FRAGMENT) || | |
104 | (nexthdr == IPPROTO_ESP) || | |
105 | (nexthdr == IPPROTO_AH) || | |
106 | (nexthdr == IPPROTO_NONE) || | |
107 | (nexthdr == IPPROTO_DSTOPTS) ); | |
108 | } | |
109 | ||
110 | /* Returns whether matches rule or not. */ | |
111 | static inline int | |
112 | ip6_packet_match(const struct sk_buff *skb, | |
113 | const char *indev, | |
114 | const char *outdev, | |
115 | const struct ip6t_ip6 *ip6info, | |
116 | unsigned int *protoff, | |
117 | int *fragoff) | |
118 | { | |
119 | size_t i; | |
120 | unsigned long ret; | |
121 | const struct ipv6hdr *ipv6 = skb->nh.ipv6h; | |
122 | ||
123 | #define FWINV(bool,invflg) ((bool) ^ !!(ip6info->invflags & invflg)) | |
124 | ||
f2ffd9ee PM |
125 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
126 | &ip6info->src), IP6T_INV_SRCIP) | |
127 | || FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, | |
128 | &ip6info->dst), IP6T_INV_DSTIP)) { | |
1da177e4 LT |
129 | dprintf("Source or dest mismatch.\n"); |
130 | /* | |
131 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, | |
132 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, | |
133 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); | |
134 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, | |
135 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, | |
136 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ | |
137 | return 0; | |
138 | } | |
139 | ||
140 | /* Look for ifname matches; this should unroll nicely. */ | |
141 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
142 | ret |= (((const unsigned long *)indev)[i] | |
143 | ^ ((const unsigned long *)ip6info->iniface)[i]) | |
144 | & ((const unsigned long *)ip6info->iniface_mask)[i]; | |
145 | } | |
146 | ||
147 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { | |
148 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
149 | indev, ip6info->iniface, | |
150 | ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":""); | |
151 | return 0; | |
152 | } | |
153 | ||
154 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
155 | ret |= (((const unsigned long *)outdev)[i] | |
156 | ^ ((const unsigned long *)ip6info->outiface)[i]) | |
157 | & ((const unsigned long *)ip6info->outiface_mask)[i]; | |
158 | } | |
159 | ||
160 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { | |
161 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
162 | outdev, ip6info->outiface, | |
163 | ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":""); | |
164 | return 0; | |
165 | } | |
166 | ||
167 | /* ... might want to do something with class and flowlabel here ... */ | |
168 | ||
169 | /* look for the desired protocol header */ | |
170 | if((ip6info->flags & IP6T_F_PROTO)) { | |
b777e0ce PM |
171 | int protohdr; |
172 | unsigned short _frag_off; | |
1da177e4 | 173 | |
b777e0ce PM |
174 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off); |
175 | if (protohdr < 0) | |
176 | return 0; | |
1da177e4 | 177 | |
b777e0ce | 178 | *fragoff = _frag_off; |
1da177e4 LT |
179 | |
180 | dprintf("Packet protocol %hi ?= %s%hi.\n", | |
b777e0ce | 181 | protohdr, |
1da177e4 LT |
182 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
183 | ip6info->proto); | |
184 | ||
b777e0ce | 185 | if (ip6info->proto == protohdr) { |
1da177e4 LT |
186 | if(ip6info->invflags & IP6T_INV_PROTO) { |
187 | return 0; | |
188 | } | |
189 | return 1; | |
190 | } | |
191 | ||
192 | /* We need match for the '-p all', too! */ | |
193 | if ((ip6info->proto != 0) && | |
194 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
195 | return 0; | |
196 | } | |
197 | return 1; | |
198 | } | |
199 | ||
200 | /* should be ip6 safe */ | |
201 | static inline int | |
202 | ip6_checkentry(const struct ip6t_ip6 *ipv6) | |
203 | { | |
204 | if (ipv6->flags & ~IP6T_F_MASK) { | |
205 | duprintf("Unknown flag bits set: %08X\n", | |
206 | ipv6->flags & ~IP6T_F_MASK); | |
207 | return 0; | |
208 | } | |
209 | if (ipv6->invflags & ~IP6T_INV_MASK) { | |
210 | duprintf("Unknown invflag bits set: %08X\n", | |
211 | ipv6->invflags & ~IP6T_INV_MASK); | |
212 | return 0; | |
213 | } | |
214 | return 1; | |
215 | } | |
216 | ||
217 | static unsigned int | |
218 | ip6t_error(struct sk_buff **pskb, | |
219 | const struct net_device *in, | |
220 | const struct net_device *out, | |
221 | unsigned int hooknum, | |
c4986734 | 222 | const struct xt_target *target, |
fe1cb108 | 223 | const void *targinfo) |
1da177e4 LT |
224 | { |
225 | if (net_ratelimit()) | |
226 | printk("ip6_tables: error: `%s'\n", (char *)targinfo); | |
227 | ||
228 | return NF_DROP; | |
229 | } | |
230 | ||
231 | static inline | |
232 | int do_match(struct ip6t_entry_match *m, | |
233 | const struct sk_buff *skb, | |
234 | const struct net_device *in, | |
235 | const struct net_device *out, | |
236 | int offset, | |
237 | unsigned int protoff, | |
238 | int *hotdrop) | |
239 | { | |
240 | /* Stop iteration if it doesn't match */ | |
1c524830 | 241 | if (!m->u.kernel.match->match(skb, in, out, m->u.kernel.match, m->data, |
1da177e4 LT |
242 | offset, protoff, hotdrop)) |
243 | return 1; | |
244 | else | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static inline struct ip6t_entry * | |
249 | get_entry(void *base, unsigned int offset) | |
250 | { | |
251 | return (struct ip6t_entry *)(base + offset); | |
252 | } | |
253 | ||
254 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ | |
255 | unsigned int | |
256 | ip6t_do_table(struct sk_buff **pskb, | |
257 | unsigned int hook, | |
258 | const struct net_device *in, | |
259 | const struct net_device *out, | |
fe1cb108 | 260 | struct xt_table *table) |
1da177e4 | 261 | { |
6b7d31fc | 262 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
263 | int offset = 0; |
264 | unsigned int protoff = 0; | |
265 | int hotdrop = 0; | |
266 | /* Initializing verdict to NF_DROP keeps gcc happy. */ | |
267 | unsigned int verdict = NF_DROP; | |
268 | const char *indev, *outdev; | |
269 | void *table_base; | |
270 | struct ip6t_entry *e, *back; | |
2e4e6a17 | 271 | struct xt_table_info *private; |
1da177e4 LT |
272 | |
273 | /* Initialization */ | |
274 | indev = in ? in->name : nulldevname; | |
275 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
276 | /* We handle fragments by dealing with the first fragment as |
277 | * if it was a normal packet. All other fragments are treated | |
278 | * normally, except that they will NEVER match rules that ask | |
279 | * things we don't know, ie. tcp syn flag or ports). If the | |
280 | * rule is also a fragment-specific rule, non-fragments won't | |
281 | * match it. */ | |
282 | ||
283 | read_lock_bh(&table->lock); | |
2e4e6a17 | 284 | private = table->private; |
1da177e4 | 285 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
2e4e6a17 HW |
286 | table_base = (void *)private->entries[smp_processor_id()]; |
287 | e = get_entry(table_base, private->hook_entry[hook]); | |
1da177e4 | 288 | |
1da177e4 | 289 | /* For return from builtin chain */ |
2e4e6a17 | 290 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
291 | |
292 | do { | |
293 | IP_NF_ASSERT(e); | |
294 | IP_NF_ASSERT(back); | |
1da177e4 LT |
295 | if (ip6_packet_match(*pskb, indev, outdev, &e->ipv6, |
296 | &protoff, &offset)) { | |
297 | struct ip6t_entry_target *t; | |
298 | ||
299 | if (IP6T_MATCH_ITERATE(e, do_match, | |
300 | *pskb, in, out, | |
301 | offset, protoff, &hotdrop) != 0) | |
302 | goto no_match; | |
303 | ||
304 | ADD_COUNTER(e->counters, | |
305 | ntohs((*pskb)->nh.ipv6h->payload_len) | |
306 | + IPV6_HDR_LEN, | |
307 | 1); | |
308 | ||
309 | t = ip6t_get_target(e); | |
310 | IP_NF_ASSERT(t->u.kernel.target); | |
311 | /* Standard target? */ | |
312 | if (!t->u.kernel.target->target) { | |
313 | int v; | |
314 | ||
315 | v = ((struct ip6t_standard_target *)t)->verdict; | |
316 | if (v < 0) { | |
317 | /* Pop from stack? */ | |
318 | if (v != IP6T_RETURN) { | |
319 | verdict = (unsigned)(-v) - 1; | |
320 | break; | |
321 | } | |
322 | e = back; | |
323 | back = get_entry(table_base, | |
324 | back->comefrom); | |
325 | continue; | |
326 | } | |
05465343 PM |
327 | if (table_base + v != (void *)e + e->next_offset |
328 | && !(e->ipv6.flags & IP6T_F_GOTO)) { | |
1da177e4 LT |
329 | /* Save old back ptr in next entry */ |
330 | struct ip6t_entry *next | |
331 | = (void *)e + e->next_offset; | |
332 | next->comefrom | |
333 | = (void *)back - table_base; | |
334 | /* set back pointer to next entry */ | |
335 | back = next; | |
336 | } | |
337 | ||
338 | e = get_entry(table_base, v); | |
339 | } else { | |
340 | /* Targets which reenter must return | |
341 | abs. verdicts */ | |
342 | #ifdef CONFIG_NETFILTER_DEBUG | |
343 | ((struct ip6t_entry *)table_base)->comefrom | |
344 | = 0xeeeeeeec; | |
345 | #endif | |
346 | verdict = t->u.kernel.target->target(pskb, | |
347 | in, out, | |
348 | hook, | |
1c524830 | 349 | t->u.kernel.target, |
fe1cb108 | 350 | t->data); |
1da177e4 LT |
351 | |
352 | #ifdef CONFIG_NETFILTER_DEBUG | |
353 | if (((struct ip6t_entry *)table_base)->comefrom | |
354 | != 0xeeeeeeec | |
355 | && verdict == IP6T_CONTINUE) { | |
356 | printk("Target %s reentered!\n", | |
357 | t->u.kernel.target->name); | |
358 | verdict = NF_DROP; | |
359 | } | |
360 | ((struct ip6t_entry *)table_base)->comefrom | |
361 | = 0x57acc001; | |
362 | #endif | |
363 | if (verdict == IP6T_CONTINUE) | |
364 | e = (void *)e + e->next_offset; | |
365 | else | |
366 | /* Verdict */ | |
367 | break; | |
368 | } | |
369 | } else { | |
370 | ||
371 | no_match: | |
372 | e = (void *)e + e->next_offset; | |
373 | } | |
374 | } while (!hotdrop); | |
375 | ||
376 | #ifdef CONFIG_NETFILTER_DEBUG | |
4bdbf6c0 | 377 | ((struct ip6t_entry *)table_base)->comefrom = NETFILTER_LINK_POISON; |
1da177e4 LT |
378 | #endif |
379 | read_unlock_bh(&table->lock); | |
380 | ||
381 | #ifdef DEBUG_ALLOW_ALL | |
382 | return NF_ACCEPT; | |
383 | #else | |
384 | if (hotdrop) | |
385 | return NF_DROP; | |
386 | else return verdict; | |
387 | #endif | |
388 | } | |
389 | ||
1da177e4 LT |
390 | /* All zeroes == unconditional rule. */ |
391 | static inline int | |
392 | unconditional(const struct ip6t_ip6 *ipv6) | |
393 | { | |
394 | unsigned int i; | |
395 | ||
396 | for (i = 0; i < sizeof(*ipv6); i++) | |
397 | if (((char *)ipv6)[i]) | |
398 | break; | |
399 | ||
400 | return (i == sizeof(*ipv6)); | |
401 | } | |
402 | ||
403 | /* Figures out from what hook each rule can be called: returns 0 if | |
404 | there are loops. Puts hook bitmask in comefrom. */ | |
405 | static int | |
2e4e6a17 | 406 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 407 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
408 | { |
409 | unsigned int hook; | |
410 | ||
411 | /* No recursion; use packet counter to save back ptrs (reset | |
412 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
413 | for (hook = 0; hook < NF_IP6_NUMHOOKS; hook++) { | |
414 | unsigned int pos = newinfo->hook_entry[hook]; | |
415 | struct ip6t_entry *e | |
31836064 | 416 | = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
417 | |
418 | if (!(valid_hooks & (1 << hook))) | |
419 | continue; | |
420 | ||
421 | /* Set initial back pointer. */ | |
422 | e->counters.pcnt = pos; | |
423 | ||
424 | for (;;) { | |
425 | struct ip6t_standard_target *t | |
426 | = (void *)ip6t_get_target(e); | |
427 | ||
428 | if (e->comefrom & (1 << NF_IP6_NUMHOOKS)) { | |
429 | printk("iptables: loop hook %u pos %u %08X.\n", | |
430 | hook, pos, e->comefrom); | |
431 | return 0; | |
432 | } | |
433 | e->comefrom | |
434 | |= ((1 << hook) | (1 << NF_IP6_NUMHOOKS)); | |
435 | ||
436 | /* Unconditional return/END. */ | |
437 | if (e->target_offset == sizeof(struct ip6t_entry) | |
438 | && (strcmp(t->target.u.user.name, | |
439 | IP6T_STANDARD_TARGET) == 0) | |
440 | && t->verdict < 0 | |
441 | && unconditional(&e->ipv6)) { | |
442 | unsigned int oldpos, size; | |
443 | ||
444 | /* Return: backtrack through the last | |
445 | big jump. */ | |
446 | do { | |
447 | e->comefrom ^= (1<<NF_IP6_NUMHOOKS); | |
448 | #ifdef DEBUG_IP_FIREWALL_USER | |
449 | if (e->comefrom | |
450 | & (1 << NF_IP6_NUMHOOKS)) { | |
451 | duprintf("Back unset " | |
452 | "on hook %u " | |
453 | "rule %u\n", | |
454 | hook, pos); | |
455 | } | |
456 | #endif | |
457 | oldpos = pos; | |
458 | pos = e->counters.pcnt; | |
459 | e->counters.pcnt = 0; | |
460 | ||
461 | /* We're at the start. */ | |
462 | if (pos == oldpos) | |
463 | goto next; | |
464 | ||
465 | e = (struct ip6t_entry *) | |
31836064 | 466 | (entry0 + pos); |
1da177e4 LT |
467 | } while (oldpos == pos + e->next_offset); |
468 | ||
469 | /* Move along one */ | |
470 | size = e->next_offset; | |
471 | e = (struct ip6t_entry *) | |
31836064 | 472 | (entry0 + pos + size); |
1da177e4 LT |
473 | e->counters.pcnt = pos; |
474 | pos += size; | |
475 | } else { | |
476 | int newpos = t->verdict; | |
477 | ||
478 | if (strcmp(t->target.u.user.name, | |
479 | IP6T_STANDARD_TARGET) == 0 | |
480 | && newpos >= 0) { | |
481 | /* This a jump; chase it. */ | |
482 | duprintf("Jump rule %u -> %u\n", | |
483 | pos, newpos); | |
484 | } else { | |
485 | /* ... this is a fallthru */ | |
486 | newpos = pos + e->next_offset; | |
487 | } | |
488 | e = (struct ip6t_entry *) | |
31836064 | 489 | (entry0 + newpos); |
1da177e4 LT |
490 | e->counters.pcnt = pos; |
491 | pos = newpos; | |
492 | } | |
493 | } | |
494 | next: | |
495 | duprintf("Finished chain %u\n", hook); | |
496 | } | |
497 | return 1; | |
498 | } | |
499 | ||
500 | static inline int | |
501 | cleanup_match(struct ip6t_entry_match *m, unsigned int *i) | |
502 | { | |
503 | if (i && (*i)-- == 0) | |
504 | return 1; | |
505 | ||
506 | if (m->u.kernel.match->destroy) | |
1c524830 | 507 | m->u.kernel.match->destroy(m->u.kernel.match, m->data, |
1da177e4 LT |
508 | m->u.match_size - sizeof(*m)); |
509 | module_put(m->u.kernel.match->me); | |
510 | return 0; | |
511 | } | |
512 | ||
513 | static inline int | |
514 | standard_check(const struct ip6t_entry_target *t, | |
515 | unsigned int max_offset) | |
516 | { | |
517 | struct ip6t_standard_target *targ = (void *)t; | |
518 | ||
519 | /* Check standard info. */ | |
1da177e4 LT |
520 | if (targ->verdict >= 0 |
521 | && targ->verdict > max_offset - sizeof(struct ip6t_entry)) { | |
522 | duprintf("ip6t_standard_check: bad verdict (%i)\n", | |
523 | targ->verdict); | |
524 | return 0; | |
525 | } | |
1da177e4 LT |
526 | if (targ->verdict < -NF_MAX_VERDICT - 1) { |
527 | duprintf("ip6t_standard_check: bad negative verdict (%i)\n", | |
528 | targ->verdict); | |
529 | return 0; | |
530 | } | |
531 | return 1; | |
532 | } | |
533 | ||
534 | static inline int | |
535 | check_match(struct ip6t_entry_match *m, | |
536 | const char *name, | |
537 | const struct ip6t_ip6 *ipv6, | |
538 | unsigned int hookmask, | |
539 | unsigned int *i) | |
540 | { | |
1da177e4 | 541 | struct ip6t_match *match; |
3cdc7c95 | 542 | int ret; |
1da177e4 | 543 | |
2e4e6a17 HW |
544 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, |
545 | m->u.user.revision), | |
6b7d31fc HW |
546 | "ip6t_%s", m->u.user.name); |
547 | if (IS_ERR(match) || !match) { | |
2e4e6a17 | 548 | duprintf("check_match: `%s' not found\n", m->u.user.name); |
6b7d31fc | 549 | return match ? PTR_ERR(match) : -ENOENT; |
1da177e4 LT |
550 | } |
551 | m->u.kernel.match = match; | |
1da177e4 | 552 | |
3cdc7c95 PM |
553 | ret = xt_check_match(match, AF_INET6, m->u.match_size - sizeof(*m), |
554 | name, hookmask, ipv6->proto, | |
555 | ipv6->invflags & IP6T_INV_PROTO); | |
556 | if (ret) | |
557 | goto err; | |
558 | ||
1da177e4 | 559 | if (m->u.kernel.match->checkentry |
1c524830 | 560 | && !m->u.kernel.match->checkentry(name, ipv6, match, m->data, |
1da177e4 LT |
561 | m->u.match_size - sizeof(*m), |
562 | hookmask)) { | |
1da177e4 LT |
563 | duprintf("ip_tables: check failed for `%s'.\n", |
564 | m->u.kernel.match->name); | |
3cdc7c95 PM |
565 | ret = -EINVAL; |
566 | goto err; | |
1da177e4 LT |
567 | } |
568 | ||
569 | (*i)++; | |
570 | return 0; | |
3cdc7c95 PM |
571 | err: |
572 | module_put(m->u.kernel.match->me); | |
573 | return ret; | |
1da177e4 LT |
574 | } |
575 | ||
576 | static struct ip6t_target ip6t_standard_target; | |
577 | ||
578 | static inline int | |
579 | check_entry(struct ip6t_entry *e, const char *name, unsigned int size, | |
580 | unsigned int *i) | |
581 | { | |
582 | struct ip6t_entry_target *t; | |
583 | struct ip6t_target *target; | |
584 | int ret; | |
585 | unsigned int j; | |
586 | ||
587 | if (!ip6_checkentry(&e->ipv6)) { | |
588 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
589 | return -EINVAL; | |
590 | } | |
591 | ||
592 | j = 0; | |
593 | ret = IP6T_MATCH_ITERATE(e, check_match, name, &e->ipv6, e->comefrom, &j); | |
594 | if (ret != 0) | |
595 | goto cleanup_matches; | |
596 | ||
597 | t = ip6t_get_target(e); | |
2e4e6a17 HW |
598 | target = try_then_request_module(xt_find_target(AF_INET6, |
599 | t->u.user.name, | |
600 | t->u.user.revision), | |
6b7d31fc HW |
601 | "ip6t_%s", t->u.user.name); |
602 | if (IS_ERR(target) || !target) { | |
1da177e4 | 603 | duprintf("check_entry: `%s' not found\n", t->u.user.name); |
6b7d31fc | 604 | ret = target ? PTR_ERR(target) : -ENOENT; |
1da177e4 LT |
605 | goto cleanup_matches; |
606 | } | |
607 | t->u.kernel.target = target; | |
6b7d31fc | 608 | |
3cdc7c95 PM |
609 | ret = xt_check_target(target, AF_INET6, t->u.target_size - sizeof(*t), |
610 | name, e->comefrom, e->ipv6.proto, | |
611 | e->ipv6.invflags & IP6T_INV_PROTO); | |
612 | if (ret) | |
613 | goto err; | |
614 | ||
1da177e4 LT |
615 | if (t->u.kernel.target == &ip6t_standard_target) { |
616 | if (!standard_check(t, size)) { | |
617 | ret = -EINVAL; | |
618 | goto cleanup_matches; | |
619 | } | |
620 | } else if (t->u.kernel.target->checkentry | |
1c524830 | 621 | && !t->u.kernel.target->checkentry(name, e, target, t->data, |
1da177e4 LT |
622 | t->u.target_size |
623 | - sizeof(*t), | |
624 | e->comefrom)) { | |
1da177e4 LT |
625 | duprintf("ip_tables: check failed for `%s'.\n", |
626 | t->u.kernel.target->name); | |
627 | ret = -EINVAL; | |
3cdc7c95 | 628 | goto err; |
1da177e4 LT |
629 | } |
630 | ||
631 | (*i)++; | |
632 | return 0; | |
3cdc7c95 PM |
633 | err: |
634 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
635 | cleanup_matches: |
636 | IP6T_MATCH_ITERATE(e, cleanup_match, &j); | |
637 | return ret; | |
638 | } | |
639 | ||
640 | static inline int | |
641 | check_entry_size_and_hooks(struct ip6t_entry *e, | |
2e4e6a17 | 642 | struct xt_table_info *newinfo, |
1da177e4 LT |
643 | unsigned char *base, |
644 | unsigned char *limit, | |
645 | const unsigned int *hook_entries, | |
646 | const unsigned int *underflows, | |
647 | unsigned int *i) | |
648 | { | |
649 | unsigned int h; | |
650 | ||
651 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 | |
652 | || (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
653 | duprintf("Bad offset %p\n", e); | |
654 | return -EINVAL; | |
655 | } | |
656 | ||
657 | if (e->next_offset | |
658 | < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) { | |
659 | duprintf("checking: element %p size %u\n", | |
660 | e, e->next_offset); | |
661 | return -EINVAL; | |
662 | } | |
663 | ||
664 | /* Check hooks & underflows */ | |
665 | for (h = 0; h < NF_IP6_NUMHOOKS; h++) { | |
666 | if ((unsigned char *)e - base == hook_entries[h]) | |
667 | newinfo->hook_entry[h] = hook_entries[h]; | |
668 | if ((unsigned char *)e - base == underflows[h]) | |
669 | newinfo->underflow[h] = underflows[h]; | |
670 | } | |
671 | ||
672 | /* FIXME: underflows must be unconditional, standard verdicts | |
673 | < 0 (not IP6T_RETURN). --RR */ | |
674 | ||
675 | /* Clear counters and comefrom */ | |
2e4e6a17 | 676 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
677 | e->comefrom = 0; |
678 | ||
679 | (*i)++; | |
680 | return 0; | |
681 | } | |
682 | ||
683 | static inline int | |
684 | cleanup_entry(struct ip6t_entry *e, unsigned int *i) | |
685 | { | |
686 | struct ip6t_entry_target *t; | |
687 | ||
688 | if (i && (*i)-- == 0) | |
689 | return 1; | |
690 | ||
691 | /* Cleanup all matches */ | |
692 | IP6T_MATCH_ITERATE(e, cleanup_match, NULL); | |
693 | t = ip6t_get_target(e); | |
694 | if (t->u.kernel.target->destroy) | |
1c524830 | 695 | t->u.kernel.target->destroy(t->u.kernel.target, t->data, |
1da177e4 LT |
696 | t->u.target_size - sizeof(*t)); |
697 | module_put(t->u.kernel.target->me); | |
698 | return 0; | |
699 | } | |
700 | ||
701 | /* Checks and translates the user-supplied table segment (held in | |
702 | newinfo) */ | |
703 | static int | |
704 | translate_table(const char *name, | |
705 | unsigned int valid_hooks, | |
2e4e6a17 | 706 | struct xt_table_info *newinfo, |
31836064 | 707 | void *entry0, |
1da177e4 LT |
708 | unsigned int size, |
709 | unsigned int number, | |
710 | const unsigned int *hook_entries, | |
711 | const unsigned int *underflows) | |
712 | { | |
713 | unsigned int i; | |
714 | int ret; | |
715 | ||
716 | newinfo->size = size; | |
717 | newinfo->number = number; | |
718 | ||
719 | /* Init all hooks to impossible value. */ | |
720 | for (i = 0; i < NF_IP6_NUMHOOKS; i++) { | |
721 | newinfo->hook_entry[i] = 0xFFFFFFFF; | |
722 | newinfo->underflow[i] = 0xFFFFFFFF; | |
723 | } | |
724 | ||
725 | duprintf("translate_table: size %u\n", newinfo->size); | |
726 | i = 0; | |
727 | /* Walk through entries, checking offsets. */ | |
31836064 | 728 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
729 | check_entry_size_and_hooks, |
730 | newinfo, | |
31836064 ED |
731 | entry0, |
732 | entry0 + size, | |
1da177e4 LT |
733 | hook_entries, underflows, &i); |
734 | if (ret != 0) | |
735 | return ret; | |
736 | ||
737 | if (i != number) { | |
738 | duprintf("translate_table: %u not %u entries\n", | |
739 | i, number); | |
740 | return -EINVAL; | |
741 | } | |
742 | ||
743 | /* Check hooks all assigned */ | |
744 | for (i = 0; i < NF_IP6_NUMHOOKS; i++) { | |
745 | /* Only hooks which are valid */ | |
746 | if (!(valid_hooks & (1 << i))) | |
747 | continue; | |
748 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
749 | duprintf("Invalid hook entry %u %u\n", | |
750 | i, hook_entries[i]); | |
751 | return -EINVAL; | |
752 | } | |
753 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
754 | duprintf("Invalid underflow %u %u\n", | |
755 | i, underflows[i]); | |
756 | return -EINVAL; | |
757 | } | |
758 | } | |
759 | ||
31836064 | 760 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
1da177e4 LT |
761 | return -ELOOP; |
762 | ||
763 | /* Finally, each sanity check must pass */ | |
764 | i = 0; | |
31836064 | 765 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
766 | check_entry, name, size, &i); |
767 | ||
768 | if (ret != 0) { | |
31836064 | 769 | IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
770 | cleanup_entry, &i); |
771 | return ret; | |
772 | } | |
773 | ||
774 | /* And one copy for every other CPU */ | |
6f912042 | 775 | for_each_possible_cpu(i) { |
31836064 ED |
776 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
777 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
778 | } |
779 | ||
780 | return ret; | |
781 | } | |
782 | ||
1da177e4 LT |
783 | /* Gets counters. */ |
784 | static inline int | |
785 | add_entry_to_counter(const struct ip6t_entry *e, | |
2e4e6a17 | 786 | struct xt_counters total[], |
1da177e4 LT |
787 | unsigned int *i) |
788 | { | |
789 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
790 | ||
791 | (*i)++; | |
792 | return 0; | |
793 | } | |
794 | ||
31836064 ED |
795 | static inline int |
796 | set_entry_to_counter(const struct ip6t_entry *e, | |
797 | struct ip6t_counters total[], | |
798 | unsigned int *i) | |
799 | { | |
800 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
801 | ||
802 | (*i)++; | |
803 | return 0; | |
804 | } | |
805 | ||
1da177e4 | 806 | static void |
2e4e6a17 HW |
807 | get_counters(const struct xt_table_info *t, |
808 | struct xt_counters counters[]) | |
1da177e4 LT |
809 | { |
810 | unsigned int cpu; | |
811 | unsigned int i; | |
31836064 ED |
812 | unsigned int curcpu; |
813 | ||
814 | /* Instead of clearing (by a previous call to memset()) | |
815 | * the counters and using adds, we set the counters | |
816 | * with data used by 'current' CPU | |
817 | * We dont care about preemption here. | |
818 | */ | |
819 | curcpu = raw_smp_processor_id(); | |
820 | ||
821 | i = 0; | |
822 | IP6T_ENTRY_ITERATE(t->entries[curcpu], | |
823 | t->size, | |
824 | set_entry_to_counter, | |
825 | counters, | |
826 | &i); | |
1da177e4 | 827 | |
6f912042 | 828 | for_each_possible_cpu(cpu) { |
31836064 ED |
829 | if (cpu == curcpu) |
830 | continue; | |
1da177e4 | 831 | i = 0; |
31836064 | 832 | IP6T_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
833 | t->size, |
834 | add_entry_to_counter, | |
835 | counters, | |
836 | &i); | |
837 | } | |
838 | } | |
839 | ||
840 | static int | |
841 | copy_entries_to_user(unsigned int total_size, | |
2e4e6a17 | 842 | struct xt_table *table, |
1da177e4 LT |
843 | void __user *userptr) |
844 | { | |
845 | unsigned int off, num, countersize; | |
846 | struct ip6t_entry *e; | |
2e4e6a17 HW |
847 | struct xt_counters *counters; |
848 | struct xt_table_info *private = table->private; | |
1da177e4 | 849 | int ret = 0; |
31836064 | 850 | void *loc_cpu_entry; |
1da177e4 LT |
851 | |
852 | /* We need atomic snapshot of counters: rest doesn't change | |
853 | (other than comefrom, which userspace doesn't care | |
854 | about). */ | |
2e4e6a17 | 855 | countersize = sizeof(struct xt_counters) * private->number; |
1da177e4 LT |
856 | counters = vmalloc(countersize); |
857 | ||
858 | if (counters == NULL) | |
859 | return -ENOMEM; | |
860 | ||
861 | /* First, sum counters... */ | |
1da177e4 | 862 | write_lock_bh(&table->lock); |
2e4e6a17 | 863 | get_counters(private, counters); |
1da177e4 LT |
864 | write_unlock_bh(&table->lock); |
865 | ||
31836064 | 866 | /* choose the copy that is on ourc node/cpu */ |
2e4e6a17 | 867 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 868 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
869 | ret = -EFAULT; |
870 | goto free_counters; | |
871 | } | |
872 | ||
873 | /* FIXME: use iterator macros --RR */ | |
874 | /* ... then go back and fix counters and names */ | |
875 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
876 | unsigned int i; | |
877 | struct ip6t_entry_match *m; | |
878 | struct ip6t_entry_target *t; | |
879 | ||
31836064 | 880 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
881 | if (copy_to_user(userptr + off |
882 | + offsetof(struct ip6t_entry, counters), | |
883 | &counters[num], | |
884 | sizeof(counters[num])) != 0) { | |
885 | ret = -EFAULT; | |
886 | goto free_counters; | |
887 | } | |
888 | ||
889 | for (i = sizeof(struct ip6t_entry); | |
890 | i < e->target_offset; | |
891 | i += m->u.match_size) { | |
892 | m = (void *)e + i; | |
893 | ||
894 | if (copy_to_user(userptr + off + i | |
895 | + offsetof(struct ip6t_entry_match, | |
896 | u.user.name), | |
897 | m->u.kernel.match->name, | |
898 | strlen(m->u.kernel.match->name)+1) | |
899 | != 0) { | |
900 | ret = -EFAULT; | |
901 | goto free_counters; | |
902 | } | |
903 | } | |
904 | ||
905 | t = ip6t_get_target(e); | |
906 | if (copy_to_user(userptr + off + e->target_offset | |
907 | + offsetof(struct ip6t_entry_target, | |
908 | u.user.name), | |
909 | t->u.kernel.target->name, | |
910 | strlen(t->u.kernel.target->name)+1) != 0) { | |
911 | ret = -EFAULT; | |
912 | goto free_counters; | |
913 | } | |
914 | } | |
915 | ||
916 | free_counters: | |
917 | vfree(counters); | |
918 | return ret; | |
919 | } | |
920 | ||
921 | static int | |
922 | get_entries(const struct ip6t_get_entries *entries, | |
923 | struct ip6t_get_entries __user *uptr) | |
924 | { | |
925 | int ret; | |
2e4e6a17 | 926 | struct xt_table *t; |
1da177e4 | 927 | |
2e4e6a17 | 928 | t = xt_find_table_lock(AF_INET6, entries->name); |
6b7d31fc | 929 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
930 | struct xt_table_info *private = t->private; |
931 | duprintf("t->private->number = %u\n", private->number); | |
932 | if (entries->size == private->size) | |
933 | ret = copy_entries_to_user(private->size, | |
1da177e4 LT |
934 | t, uptr->entrytable); |
935 | else { | |
936 | duprintf("get_entries: I've got %u not %u!\n", | |
2e4e6a17 | 937 | private->size, entries->size); |
1da177e4 LT |
938 | ret = -EINVAL; |
939 | } | |
6b7d31fc | 940 | module_put(t->me); |
2e4e6a17 | 941 | xt_table_unlock(t); |
1da177e4 | 942 | } else |
6b7d31fc | 943 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
944 | |
945 | return ret; | |
946 | } | |
947 | ||
948 | static int | |
949 | do_replace(void __user *user, unsigned int len) | |
950 | { | |
951 | int ret; | |
952 | struct ip6t_replace tmp; | |
2e4e6a17 HW |
953 | struct xt_table *t; |
954 | struct xt_table_info *newinfo, *oldinfo; | |
955 | struct xt_counters *counters; | |
31836064 | 956 | void *loc_cpu_entry, *loc_cpu_old_entry; |
1da177e4 LT |
957 | |
958 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
959 | return -EFAULT; | |
960 | ||
ee4bb818 KK |
961 | /* overflow check */ |
962 | if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS - | |
963 | SMP_CACHE_BYTES) | |
964 | return -ENOMEM; | |
965 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
966 | return -ENOMEM; | |
967 | ||
2e4e6a17 | 968 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
969 | if (!newinfo) |
970 | return -ENOMEM; | |
971 | ||
31836064 ED |
972 | /* choose the copy that is on our node/cpu */ |
973 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
974 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
975 | tmp.size) != 0) { |
976 | ret = -EFAULT; | |
977 | goto free_newinfo; | |
978 | } | |
979 | ||
2e4e6a17 | 980 | counters = vmalloc(tmp.num_counters * sizeof(struct xt_counters)); |
1da177e4 LT |
981 | if (!counters) { |
982 | ret = -ENOMEM; | |
983 | goto free_newinfo; | |
984 | } | |
1da177e4 LT |
985 | |
986 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
31836064 | 987 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, |
1da177e4 LT |
988 | tmp.hook_entry, tmp.underflow); |
989 | if (ret != 0) | |
990 | goto free_newinfo_counters; | |
991 | ||
992 | duprintf("ip_tables: Translated table\n"); | |
993 | ||
2e4e6a17 | 994 | t = try_then_request_module(xt_find_table_lock(AF_INET6, tmp.name), |
6b7d31fc HW |
995 | "ip6table_%s", tmp.name); |
996 | if (!t || IS_ERR(t)) { | |
997 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 998 | goto free_newinfo_counters_untrans; |
6b7d31fc | 999 | } |
1da177e4 LT |
1000 | |
1001 | /* You lied! */ | |
1002 | if (tmp.valid_hooks != t->valid_hooks) { | |
1003 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1004 | tmp.valid_hooks, t->valid_hooks); | |
1005 | ret = -EINVAL; | |
6b7d31fc | 1006 | goto put_module; |
1da177e4 LT |
1007 | } |
1008 | ||
2e4e6a17 | 1009 | oldinfo = xt_replace_table(t, tmp.num_counters, newinfo, &ret); |
1da177e4 LT |
1010 | if (!oldinfo) |
1011 | goto put_module; | |
1012 | ||
1013 | /* Update module usage count based on number of rules */ | |
1014 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1015 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1016 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1017 | (newinfo->number <= oldinfo->initial_entries)) | |
1018 | module_put(t->me); | |
1019 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1020 | (newinfo->number <= oldinfo->initial_entries)) | |
1021 | module_put(t->me); | |
1022 | ||
1023 | /* Get the old counters. */ | |
1024 | get_counters(oldinfo, counters); | |
1025 | /* Decrease module usage counts and free resource */ | |
31836064 ED |
1026 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
1027 | IP6T_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL); | |
2e4e6a17 | 1028 | xt_free_table_info(oldinfo); |
1da177e4 | 1029 | if (copy_to_user(tmp.counters, counters, |
2e4e6a17 | 1030 | sizeof(struct xt_counters) * tmp.num_counters) != 0) |
1da177e4 LT |
1031 | ret = -EFAULT; |
1032 | vfree(counters); | |
2e4e6a17 | 1033 | xt_table_unlock(t); |
1da177e4 LT |
1034 | return ret; |
1035 | ||
1036 | put_module: | |
1037 | module_put(t->me); | |
2e4e6a17 | 1038 | xt_table_unlock(t); |
1da177e4 | 1039 | free_newinfo_counters_untrans: |
31836064 | 1040 | IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL); |
1da177e4 LT |
1041 | free_newinfo_counters: |
1042 | vfree(counters); | |
1043 | free_newinfo: | |
2e4e6a17 | 1044 | xt_free_table_info(newinfo); |
1da177e4 LT |
1045 | return ret; |
1046 | } | |
1047 | ||
1048 | /* We're lazy, and add to the first CPU; overflow works its fey magic | |
1049 | * and everything is OK. */ | |
1050 | static inline int | |
1051 | add_counter_to_entry(struct ip6t_entry *e, | |
2e4e6a17 | 1052 | const struct xt_counters addme[], |
1da177e4 LT |
1053 | unsigned int *i) |
1054 | { | |
1055 | #if 0 | |
1056 | duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n", | |
1057 | *i, | |
1058 | (long unsigned int)e->counters.pcnt, | |
1059 | (long unsigned int)e->counters.bcnt, | |
1060 | (long unsigned int)addme[*i].pcnt, | |
1061 | (long unsigned int)addme[*i].bcnt); | |
1062 | #endif | |
1063 | ||
1064 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1065 | ||
1066 | (*i)++; | |
1067 | return 0; | |
1068 | } | |
1069 | ||
1070 | static int | |
1071 | do_add_counters(void __user *user, unsigned int len) | |
1072 | { | |
1073 | unsigned int i; | |
2e4e6a17 HW |
1074 | struct xt_counters_info tmp, *paddc; |
1075 | struct xt_table_info *private; | |
1076 | struct xt_table *t; | |
6b7d31fc | 1077 | int ret = 0; |
31836064 | 1078 | void *loc_cpu_entry; |
1da177e4 LT |
1079 | |
1080 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1081 | return -EFAULT; | |
1082 | ||
2e4e6a17 | 1083 | if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct xt_counters)) |
1da177e4 LT |
1084 | return -EINVAL; |
1085 | ||
1086 | paddc = vmalloc(len); | |
1087 | if (!paddc) | |
1088 | return -ENOMEM; | |
1089 | ||
1090 | if (copy_from_user(paddc, user, len) != 0) { | |
1091 | ret = -EFAULT; | |
1092 | goto free; | |
1093 | } | |
1094 | ||
2e4e6a17 | 1095 | t = xt_find_table_lock(AF_INET6, tmp.name); |
6b7d31fc HW |
1096 | if (!t || IS_ERR(t)) { |
1097 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1098 | goto free; |
6b7d31fc | 1099 | } |
1da177e4 LT |
1100 | |
1101 | write_lock_bh(&t->lock); | |
2e4e6a17 | 1102 | private = t->private; |
2c8ac66b | 1103 | if (private->number != tmp.num_counters) { |
1da177e4 LT |
1104 | ret = -EINVAL; |
1105 | goto unlock_up_free; | |
1106 | } | |
1107 | ||
1108 | i = 0; | |
31836064 | 1109 | /* Choose the copy that is on our node */ |
2e4e6a17 | 1110 | loc_cpu_entry = private->entries[smp_processor_id()]; |
31836064 | 1111 | IP6T_ENTRY_ITERATE(loc_cpu_entry, |
2e4e6a17 | 1112 | private->size, |
1da177e4 LT |
1113 | add_counter_to_entry, |
1114 | paddc->counters, | |
1115 | &i); | |
1116 | unlock_up_free: | |
1117 | write_unlock_bh(&t->lock); | |
2e4e6a17 | 1118 | xt_table_unlock(t); |
6b7d31fc | 1119 | module_put(t->me); |
1da177e4 LT |
1120 | free: |
1121 | vfree(paddc); | |
1122 | ||
1123 | return ret; | |
1124 | } | |
1125 | ||
1126 | static int | |
1127 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
1128 | { | |
1129 | int ret; | |
1130 | ||
1131 | if (!capable(CAP_NET_ADMIN)) | |
1132 | return -EPERM; | |
1133 | ||
1134 | switch (cmd) { | |
1135 | case IP6T_SO_SET_REPLACE: | |
1136 | ret = do_replace(user, len); | |
1137 | break; | |
1138 | ||
1139 | case IP6T_SO_SET_ADD_COUNTERS: | |
1140 | ret = do_add_counters(user, len); | |
1141 | break; | |
1142 | ||
1143 | default: | |
1144 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1145 | ret = -EINVAL; | |
1146 | } | |
1147 | ||
1148 | return ret; | |
1149 | } | |
1150 | ||
1151 | static int | |
1152 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1153 | { | |
1154 | int ret; | |
1155 | ||
1156 | if (!capable(CAP_NET_ADMIN)) | |
1157 | return -EPERM; | |
1158 | ||
1159 | switch (cmd) { | |
1160 | case IP6T_SO_GET_INFO: { | |
1161 | char name[IP6T_TABLE_MAXNAMELEN]; | |
2e4e6a17 | 1162 | struct xt_table *t; |
1da177e4 LT |
1163 | |
1164 | if (*len != sizeof(struct ip6t_getinfo)) { | |
1165 | duprintf("length %u != %u\n", *len, | |
1166 | sizeof(struct ip6t_getinfo)); | |
1167 | ret = -EINVAL; | |
1168 | break; | |
1169 | } | |
1170 | ||
1171 | if (copy_from_user(name, user, sizeof(name)) != 0) { | |
1172 | ret = -EFAULT; | |
1173 | break; | |
1174 | } | |
1175 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; | |
6b7d31fc | 1176 | |
2e4e6a17 | 1177 | t = try_then_request_module(xt_find_table_lock(AF_INET6, name), |
6b7d31fc HW |
1178 | "ip6table_%s", name); |
1179 | if (t && !IS_ERR(t)) { | |
1da177e4 | 1180 | struct ip6t_getinfo info; |
2e4e6a17 | 1181 | struct xt_table_info *private = t->private; |
1da177e4 LT |
1182 | |
1183 | info.valid_hooks = t->valid_hooks; | |
2e4e6a17 | 1184 | memcpy(info.hook_entry, private->hook_entry, |
1da177e4 | 1185 | sizeof(info.hook_entry)); |
2e4e6a17 | 1186 | memcpy(info.underflow, private->underflow, |
1da177e4 | 1187 | sizeof(info.underflow)); |
2e4e6a17 HW |
1188 | info.num_entries = private->number; |
1189 | info.size = private->size; | |
1da177e4 LT |
1190 | memcpy(info.name, name, sizeof(info.name)); |
1191 | ||
1192 | if (copy_to_user(user, &info, *len) != 0) | |
1193 | ret = -EFAULT; | |
1194 | else | |
1195 | ret = 0; | |
2e4e6a17 | 1196 | xt_table_unlock(t); |
6b7d31fc HW |
1197 | module_put(t->me); |
1198 | } else | |
1199 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 LT |
1200 | } |
1201 | break; | |
1202 | ||
1203 | case IP6T_SO_GET_ENTRIES: { | |
1204 | struct ip6t_get_entries get; | |
1205 | ||
1206 | if (*len < sizeof(get)) { | |
1207 | duprintf("get_entries: %u < %u\n", *len, sizeof(get)); | |
1208 | ret = -EINVAL; | |
1209 | } else if (copy_from_user(&get, user, sizeof(get)) != 0) { | |
1210 | ret = -EFAULT; | |
1211 | } else if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
1212 | duprintf("get_entries: %u != %u\n", *len, | |
1213 | sizeof(struct ip6t_get_entries) + get.size); | |
1214 | ret = -EINVAL; | |
1215 | } else | |
1216 | ret = get_entries(&get, user); | |
1217 | break; | |
1218 | } | |
1219 | ||
6b7d31fc HW |
1220 | case IP6T_SO_GET_REVISION_MATCH: |
1221 | case IP6T_SO_GET_REVISION_TARGET: { | |
1222 | struct ip6t_get_revision rev; | |
2e4e6a17 | 1223 | int target; |
6b7d31fc HW |
1224 | |
1225 | if (*len != sizeof(rev)) { | |
1226 | ret = -EINVAL; | |
1227 | break; | |
1228 | } | |
1229 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1230 | ret = -EFAULT; | |
1231 | break; | |
1232 | } | |
1233 | ||
1234 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 1235 | target = 1; |
6b7d31fc | 1236 | else |
2e4e6a17 | 1237 | target = 0; |
6b7d31fc | 1238 | |
2e4e6a17 HW |
1239 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
1240 | rev.revision, | |
1241 | target, &ret), | |
6b7d31fc HW |
1242 | "ip6t_%s", rev.name); |
1243 | break; | |
1244 | } | |
1245 | ||
1da177e4 LT |
1246 | default: |
1247 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
1248 | ret = -EINVAL; | |
1249 | } | |
1250 | ||
1251 | return ret; | |
1252 | } | |
1253 | ||
2e4e6a17 | 1254 | int ip6t_register_table(struct xt_table *table, |
1da177e4 LT |
1255 | const struct ip6t_replace *repl) |
1256 | { | |
1257 | int ret; | |
2e4e6a17 HW |
1258 | struct xt_table_info *newinfo; |
1259 | static struct xt_table_info bootstrap | |
1da177e4 | 1260 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 1261 | void *loc_cpu_entry; |
1da177e4 | 1262 | |
2e4e6a17 | 1263 | newinfo = xt_alloc_table_info(repl->size); |
1da177e4 LT |
1264 | if (!newinfo) |
1265 | return -ENOMEM; | |
1266 | ||
31836064 ED |
1267 | /* choose the copy on our node/cpu */ |
1268 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1269 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
1270 | |
1271 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 1272 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
1273 | repl->num_entries, |
1274 | repl->hook_entry, | |
1275 | repl->underflow); | |
1276 | if (ret != 0) { | |
2e4e6a17 | 1277 | xt_free_table_info(newinfo); |
1da177e4 LT |
1278 | return ret; |
1279 | } | |
1280 | ||
da298d3a PM |
1281 | ret = xt_register_table(table, &bootstrap, newinfo); |
1282 | if (ret != 0) { | |
2e4e6a17 | 1283 | xt_free_table_info(newinfo); |
1da177e4 LT |
1284 | return ret; |
1285 | } | |
1286 | ||
2e4e6a17 | 1287 | return 0; |
1da177e4 LT |
1288 | } |
1289 | ||
2e4e6a17 | 1290 | void ip6t_unregister_table(struct xt_table *table) |
1da177e4 | 1291 | { |
2e4e6a17 | 1292 | struct xt_table_info *private; |
31836064 ED |
1293 | void *loc_cpu_entry; |
1294 | ||
2e4e6a17 | 1295 | private = xt_unregister_table(table); |
1da177e4 LT |
1296 | |
1297 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
1298 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
1299 | IP6T_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
1300 | xt_free_table_info(private); | |
1da177e4 LT |
1301 | } |
1302 | ||
1303 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1304 | static inline int | |
1305 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, | |
1306 | u_int8_t type, u_int8_t code, | |
1307 | int invert) | |
1308 | { | |
1309 | return (type == test_type && code >= min_code && code <= max_code) | |
1310 | ^ invert; | |
1311 | } | |
1312 | ||
1313 | static int | |
1314 | icmp6_match(const struct sk_buff *skb, | |
1315 | const struct net_device *in, | |
1316 | const struct net_device *out, | |
c4986734 | 1317 | const struct xt_match *match, |
1da177e4 LT |
1318 | const void *matchinfo, |
1319 | int offset, | |
1320 | unsigned int protoff, | |
1321 | int *hotdrop) | |
1322 | { | |
1323 | struct icmp6hdr _icmp, *ic; | |
1324 | const struct ip6t_icmp *icmpinfo = matchinfo; | |
1325 | ||
1326 | /* Must not be a fragment. */ | |
1327 | if (offset) | |
1328 | return 0; | |
1329 | ||
1330 | ic = skb_header_pointer(skb, protoff, sizeof(_icmp), &_icmp); | |
1331 | if (ic == NULL) { | |
1332 | /* We've been asked to examine this packet, and we | |
1333 | can't. Hence, no choice but to drop. */ | |
1334 | duprintf("Dropping evil ICMP tinygram.\n"); | |
1335 | *hotdrop = 1; | |
1336 | return 0; | |
1337 | } | |
1338 | ||
1339 | return icmp6_type_code_match(icmpinfo->type, | |
1340 | icmpinfo->code[0], | |
1341 | icmpinfo->code[1], | |
1342 | ic->icmp6_type, ic->icmp6_code, | |
1343 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
1344 | } | |
1345 | ||
1346 | /* Called when user tries to insert an entry of this type. */ | |
1347 | static int | |
1348 | icmp6_checkentry(const char *tablename, | |
2e4e6a17 | 1349 | const void *entry, |
c4986734 | 1350 | const struct xt_match *match, |
1da177e4 LT |
1351 | void *matchinfo, |
1352 | unsigned int matchsize, | |
1353 | unsigned int hook_mask) | |
1354 | { | |
1355 | const struct ip6t_icmp *icmpinfo = matchinfo; | |
1356 | ||
7f939713 PM |
1357 | /* Must specify no unknown invflags */ |
1358 | return !(icmpinfo->invflags & ~IP6T_ICMP_INV); | |
1da177e4 LT |
1359 | } |
1360 | ||
1361 | /* The built-in targets: standard (NULL) and error. */ | |
1362 | static struct ip6t_target ip6t_standard_target = { | |
1363 | .name = IP6T_STANDARD_TARGET, | |
7f939713 | 1364 | .targetsize = sizeof(int), |
a45049c5 | 1365 | .family = AF_INET6, |
1da177e4 LT |
1366 | }; |
1367 | ||
1368 | static struct ip6t_target ip6t_error_target = { | |
1369 | .name = IP6T_ERROR_TARGET, | |
1370 | .target = ip6t_error, | |
7f939713 | 1371 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, |
a45049c5 | 1372 | .family = AF_INET6, |
1da177e4 LT |
1373 | }; |
1374 | ||
1375 | static struct nf_sockopt_ops ip6t_sockopts = { | |
1376 | .pf = PF_INET6, | |
1377 | .set_optmin = IP6T_BASE_CTL, | |
1378 | .set_optmax = IP6T_SO_SET_MAX+1, | |
1379 | .set = do_ip6t_set_ctl, | |
1380 | .get_optmin = IP6T_BASE_CTL, | |
1381 | .get_optmax = IP6T_SO_GET_MAX+1, | |
1382 | .get = do_ip6t_get_ctl, | |
1383 | }; | |
1384 | ||
1da177e4 LT |
1385 | static struct ip6t_match icmp6_matchstruct = { |
1386 | .name = "icmp6", | |
1387 | .match = &icmp6_match, | |
7f939713 PM |
1388 | .matchsize = sizeof(struct ip6t_icmp), |
1389 | .checkentry = icmp6_checkentry, | |
1390 | .proto = IPPROTO_ICMPV6, | |
a45049c5 | 1391 | .family = AF_INET6, |
1da177e4 LT |
1392 | }; |
1393 | ||
65b4b4e8 | 1394 | static int __init ip6_tables_init(void) |
1da177e4 LT |
1395 | { |
1396 | int ret; | |
1397 | ||
0eff66e6 PM |
1398 | ret = xt_proto_init(AF_INET6); |
1399 | if (ret < 0) | |
1400 | goto err1; | |
2e4e6a17 | 1401 | |
1da177e4 | 1402 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
1403 | ret = xt_register_target(&ip6t_standard_target); |
1404 | if (ret < 0) | |
1405 | goto err2; | |
1406 | ret = xt_register_target(&ip6t_error_target); | |
1407 | if (ret < 0) | |
1408 | goto err3; | |
1409 | ret = xt_register_match(&icmp6_matchstruct); | |
1410 | if (ret < 0) | |
1411 | goto err4; | |
1da177e4 LT |
1412 | |
1413 | /* Register setsockopt */ | |
1414 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
1415 | if (ret < 0) |
1416 | goto err5; | |
1da177e4 | 1417 | |
2e4e6a17 | 1418 | printk("ip6_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 1419 | return 0; |
0eff66e6 PM |
1420 | |
1421 | err5: | |
1422 | xt_unregister_match(&icmp6_matchstruct); | |
1423 | err4: | |
1424 | xt_unregister_target(&ip6t_error_target); | |
1425 | err3: | |
1426 | xt_unregister_target(&ip6t_standard_target); | |
1427 | err2: | |
1428 | xt_proto_fini(AF_INET6); | |
1429 | err1: | |
1430 | return ret; | |
1da177e4 LT |
1431 | } |
1432 | ||
65b4b4e8 | 1433 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
1434 | { |
1435 | nf_unregister_sockopt(&ip6t_sockopts); | |
a45049c5 PNA |
1436 | xt_unregister_match(&icmp6_matchstruct); |
1437 | xt_unregister_target(&ip6t_error_target); | |
1438 | xt_unregister_target(&ip6t_standard_target); | |
2e4e6a17 | 1439 | xt_proto_fini(AF_INET6); |
1da177e4 LT |
1440 | } |
1441 | ||
e674d0f3 | 1442 | /* |
b777e0ce PM |
1443 | * find the offset to specified header or the protocol number of last header |
1444 | * if target < 0. "last header" is transport protocol header, ESP, or | |
1445 | * "No next header". | |
1446 | * | |
1447 | * If target header is found, its offset is set in *offset and return protocol | |
1448 | * number. Otherwise, return -1. | |
1449 | * | |
1450 | * Note that non-1st fragment is special case that "the protocol number | |
1451 | * of last header" is "next header" field in Fragment header. In this case, | |
1452 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
1453 | * isn't NULL. | |
e674d0f3 | 1454 | * |
e674d0f3 | 1455 | */ |
b777e0ce PM |
1456 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
1457 | int target, unsigned short *fragoff) | |
e674d0f3 YK |
1458 | { |
1459 | unsigned int start = (u8*)(skb->nh.ipv6h + 1) - skb->data; | |
1460 | u8 nexthdr = skb->nh.ipv6h->nexthdr; | |
1461 | unsigned int len = skb->len - start; | |
1462 | ||
b777e0ce PM |
1463 | if (fragoff) |
1464 | *fragoff = 0; | |
1465 | ||
e674d0f3 YK |
1466 | while (nexthdr != target) { |
1467 | struct ipv6_opt_hdr _hdr, *hp; | |
1468 | unsigned int hdrlen; | |
1469 | ||
b777e0ce PM |
1470 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
1471 | if (target < 0) | |
1472 | break; | |
e674d0f3 | 1473 | return -1; |
b777e0ce PM |
1474 | } |
1475 | ||
e674d0f3 YK |
1476 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
1477 | if (hp == NULL) | |
1478 | return -1; | |
1479 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
1480 | unsigned short _frag_off, *fp; | |
1481 | fp = skb_header_pointer(skb, | |
1482 | start+offsetof(struct frag_hdr, | |
1483 | frag_off), | |
1484 | sizeof(_frag_off), | |
1485 | &_frag_off); | |
1486 | if (fp == NULL) | |
1487 | return -1; | |
1488 | ||
b777e0ce PM |
1489 | _frag_off = ntohs(*fp) & ~0x7; |
1490 | if (_frag_off) { | |
1491 | if (target < 0 && | |
1492 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
1493 | nexthdr == NEXTHDR_NONE)) { | |
1494 | if (fragoff) | |
1495 | *fragoff = _frag_off; | |
1496 | return hp->nexthdr; | |
1497 | } | |
e674d0f3 | 1498 | return -1; |
b777e0ce | 1499 | } |
e674d0f3 YK |
1500 | hdrlen = 8; |
1501 | } else if (nexthdr == NEXTHDR_AUTH) | |
1502 | hdrlen = (hp->hdrlen + 2) << 2; | |
1503 | else | |
1504 | hdrlen = ipv6_optlen(hp); | |
1505 | ||
1506 | nexthdr = hp->nexthdr; | |
1507 | len -= hdrlen; | |
1508 | start += hdrlen; | |
1509 | } | |
1510 | ||
1511 | *offset = start; | |
b777e0ce | 1512 | return nexthdr; |
e674d0f3 YK |
1513 | } |
1514 | ||
1da177e4 LT |
1515 | EXPORT_SYMBOL(ip6t_register_table); |
1516 | EXPORT_SYMBOL(ip6t_unregister_table); | |
1517 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 1518 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 1519 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 1520 | |
65b4b4e8 AM |
1521 | module_init(ip6_tables_init); |
1522 | module_exit(ip6_tables_fini); |