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 LT |
73 | #if 0 |
74 | /* All the better to debug you with... */ | |
75 | #define static | |
76 | #define inline | |
77 | #endif | |
78 | ||
6b7d31fc | 79 | /* |
1da177e4 | 80 | We keep a set of rules for each CPU, so we can avoid write-locking |
6b7d31fc HW |
81 | them in the softirq when updating the counters and therefore |
82 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
83 | context stops packets coming through and allows user context to read | |
84 | the counters or update the rules. | |
1da177e4 | 85 | |
1da177e4 LT |
86 | Hence the start of any table is given by get_table() below. */ |
87 | ||
1da177e4 LT |
88 | #if 0 |
89 | #define down(x) do { printk("DOWN:%u:" #x "\n", __LINE__); down(x); } while(0) | |
90 | #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; }) | |
91 | #define up(x) do { printk("UP:%u:" #x "\n", __LINE__); up(x); } while(0) | |
92 | #endif | |
93 | ||
1da177e4 LT |
94 | /* Check for an extension */ |
95 | int | |
96 | ip6t_ext_hdr(u8 nexthdr) | |
97 | { | |
98 | return ( (nexthdr == IPPROTO_HOPOPTS) || | |
99 | (nexthdr == IPPROTO_ROUTING) || | |
100 | (nexthdr == IPPROTO_FRAGMENT) || | |
101 | (nexthdr == IPPROTO_ESP) || | |
102 | (nexthdr == IPPROTO_AH) || | |
103 | (nexthdr == IPPROTO_NONE) || | |
104 | (nexthdr == IPPROTO_DSTOPTS) ); | |
105 | } | |
106 | ||
107 | /* Returns whether matches rule or not. */ | |
108 | static inline int | |
109 | ip6_packet_match(const struct sk_buff *skb, | |
110 | const char *indev, | |
111 | const char *outdev, | |
112 | const struct ip6t_ip6 *ip6info, | |
113 | unsigned int *protoff, | |
114 | int *fragoff) | |
115 | { | |
116 | size_t i; | |
117 | unsigned long ret; | |
118 | const struct ipv6hdr *ipv6 = skb->nh.ipv6h; | |
119 | ||
120 | #define FWINV(bool,invflg) ((bool) ^ !!(ip6info->invflags & invflg)) | |
121 | ||
f2ffd9ee PM |
122 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
123 | &ip6info->src), IP6T_INV_SRCIP) | |
124 | || FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, | |
125 | &ip6info->dst), IP6T_INV_DSTIP)) { | |
1da177e4 LT |
126 | dprintf("Source or dest mismatch.\n"); |
127 | /* | |
128 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, | |
129 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, | |
130 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); | |
131 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, | |
132 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, | |
133 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ | |
134 | return 0; | |
135 | } | |
136 | ||
137 | /* Look for ifname matches; this should unroll nicely. */ | |
138 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
139 | ret |= (((const unsigned long *)indev)[i] | |
140 | ^ ((const unsigned long *)ip6info->iniface)[i]) | |
141 | & ((const unsigned long *)ip6info->iniface_mask)[i]; | |
142 | } | |
143 | ||
144 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { | |
145 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
146 | indev, ip6info->iniface, | |
147 | ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":""); | |
148 | return 0; | |
149 | } | |
150 | ||
151 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
152 | ret |= (((const unsigned long *)outdev)[i] | |
153 | ^ ((const unsigned long *)ip6info->outiface)[i]) | |
154 | & ((const unsigned long *)ip6info->outiface_mask)[i]; | |
155 | } | |
156 | ||
157 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { | |
158 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
159 | outdev, ip6info->outiface, | |
160 | ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":""); | |
161 | return 0; | |
162 | } | |
163 | ||
164 | /* ... might want to do something with class and flowlabel here ... */ | |
165 | ||
166 | /* look for the desired protocol header */ | |
167 | if((ip6info->flags & IP6T_F_PROTO)) { | |
b777e0ce PM |
168 | int protohdr; |
169 | unsigned short _frag_off; | |
1da177e4 | 170 | |
b777e0ce PM |
171 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off); |
172 | if (protohdr < 0) | |
173 | return 0; | |
1da177e4 | 174 | |
b777e0ce | 175 | *fragoff = _frag_off; |
1da177e4 LT |
176 | |
177 | dprintf("Packet protocol %hi ?= %s%hi.\n", | |
b777e0ce | 178 | protohdr, |
1da177e4 LT |
179 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
180 | ip6info->proto); | |
181 | ||
b777e0ce | 182 | if (ip6info->proto == protohdr) { |
1da177e4 LT |
183 | if(ip6info->invflags & IP6T_INV_PROTO) { |
184 | return 0; | |
185 | } | |
186 | return 1; | |
187 | } | |
188 | ||
189 | /* We need match for the '-p all', too! */ | |
190 | if ((ip6info->proto != 0) && | |
191 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
192 | return 0; | |
193 | } | |
194 | return 1; | |
195 | } | |
196 | ||
197 | /* should be ip6 safe */ | |
198 | static inline int | |
199 | ip6_checkentry(const struct ip6t_ip6 *ipv6) | |
200 | { | |
201 | if (ipv6->flags & ~IP6T_F_MASK) { | |
202 | duprintf("Unknown flag bits set: %08X\n", | |
203 | ipv6->flags & ~IP6T_F_MASK); | |
204 | return 0; | |
205 | } | |
206 | if (ipv6->invflags & ~IP6T_INV_MASK) { | |
207 | duprintf("Unknown invflag bits set: %08X\n", | |
208 | ipv6->invflags & ~IP6T_INV_MASK); | |
209 | return 0; | |
210 | } | |
211 | return 1; | |
212 | } | |
213 | ||
214 | static unsigned int | |
215 | ip6t_error(struct sk_buff **pskb, | |
216 | const struct net_device *in, | |
217 | const struct net_device *out, | |
218 | unsigned int hooknum, | |
c4986734 | 219 | const struct xt_target *target, |
fe1cb108 | 220 | const void *targinfo) |
1da177e4 LT |
221 | { |
222 | if (net_ratelimit()) | |
223 | printk("ip6_tables: error: `%s'\n", (char *)targinfo); | |
224 | ||
225 | return NF_DROP; | |
226 | } | |
227 | ||
228 | static inline | |
229 | int do_match(struct ip6t_entry_match *m, | |
230 | const struct sk_buff *skb, | |
231 | const struct net_device *in, | |
232 | const struct net_device *out, | |
233 | int offset, | |
234 | unsigned int protoff, | |
235 | int *hotdrop) | |
236 | { | |
237 | /* Stop iteration if it doesn't match */ | |
1c524830 | 238 | if (!m->u.kernel.match->match(skb, in, out, m->u.kernel.match, m->data, |
1da177e4 LT |
239 | offset, protoff, hotdrop)) |
240 | return 1; | |
241 | else | |
242 | return 0; | |
243 | } | |
244 | ||
245 | static inline struct ip6t_entry * | |
246 | get_entry(void *base, unsigned int offset) | |
247 | { | |
248 | return (struct ip6t_entry *)(base + offset); | |
249 | } | |
250 | ||
251 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ | |
252 | unsigned int | |
253 | ip6t_do_table(struct sk_buff **pskb, | |
254 | unsigned int hook, | |
255 | const struct net_device *in, | |
256 | const struct net_device *out, | |
fe1cb108 | 257 | struct xt_table *table) |
1da177e4 | 258 | { |
6b7d31fc | 259 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
260 | int offset = 0; |
261 | unsigned int protoff = 0; | |
262 | int hotdrop = 0; | |
263 | /* Initializing verdict to NF_DROP keeps gcc happy. */ | |
264 | unsigned int verdict = NF_DROP; | |
265 | const char *indev, *outdev; | |
266 | void *table_base; | |
267 | struct ip6t_entry *e, *back; | |
2e4e6a17 | 268 | struct xt_table_info *private; |
1da177e4 LT |
269 | |
270 | /* Initialization */ | |
271 | indev = in ? in->name : nulldevname; | |
272 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
273 | /* We handle fragments by dealing with the first fragment as |
274 | * if it was a normal packet. All other fragments are treated | |
275 | * normally, except that they will NEVER match rules that ask | |
276 | * things we don't know, ie. tcp syn flag or ports). If the | |
277 | * rule is also a fragment-specific rule, non-fragments won't | |
278 | * match it. */ | |
279 | ||
280 | read_lock_bh(&table->lock); | |
2e4e6a17 | 281 | private = table->private; |
1da177e4 | 282 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
2e4e6a17 HW |
283 | table_base = (void *)private->entries[smp_processor_id()]; |
284 | e = get_entry(table_base, private->hook_entry[hook]); | |
1da177e4 | 285 | |
1da177e4 | 286 | /* For return from builtin chain */ |
2e4e6a17 | 287 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
288 | |
289 | do { | |
290 | IP_NF_ASSERT(e); | |
291 | IP_NF_ASSERT(back); | |
1da177e4 LT |
292 | if (ip6_packet_match(*pskb, indev, outdev, &e->ipv6, |
293 | &protoff, &offset)) { | |
294 | struct ip6t_entry_target *t; | |
295 | ||
296 | if (IP6T_MATCH_ITERATE(e, do_match, | |
297 | *pskb, in, out, | |
298 | offset, protoff, &hotdrop) != 0) | |
299 | goto no_match; | |
300 | ||
301 | ADD_COUNTER(e->counters, | |
302 | ntohs((*pskb)->nh.ipv6h->payload_len) | |
303 | + IPV6_HDR_LEN, | |
304 | 1); | |
305 | ||
306 | t = ip6t_get_target(e); | |
307 | IP_NF_ASSERT(t->u.kernel.target); | |
308 | /* Standard target? */ | |
309 | if (!t->u.kernel.target->target) { | |
310 | int v; | |
311 | ||
312 | v = ((struct ip6t_standard_target *)t)->verdict; | |
313 | if (v < 0) { | |
314 | /* Pop from stack? */ | |
315 | if (v != IP6T_RETURN) { | |
316 | verdict = (unsigned)(-v) - 1; | |
317 | break; | |
318 | } | |
319 | e = back; | |
320 | back = get_entry(table_base, | |
321 | back->comefrom); | |
322 | continue; | |
323 | } | |
05465343 PM |
324 | if (table_base + v != (void *)e + e->next_offset |
325 | && !(e->ipv6.flags & IP6T_F_GOTO)) { | |
1da177e4 LT |
326 | /* Save old back ptr in next entry */ |
327 | struct ip6t_entry *next | |
328 | = (void *)e + e->next_offset; | |
329 | next->comefrom | |
330 | = (void *)back - table_base; | |
331 | /* set back pointer to next entry */ | |
332 | back = next; | |
333 | } | |
334 | ||
335 | e = get_entry(table_base, v); | |
336 | } else { | |
337 | /* Targets which reenter must return | |
338 | abs. verdicts */ | |
339 | #ifdef CONFIG_NETFILTER_DEBUG | |
340 | ((struct ip6t_entry *)table_base)->comefrom | |
341 | = 0xeeeeeeec; | |
342 | #endif | |
343 | verdict = t->u.kernel.target->target(pskb, | |
344 | in, out, | |
345 | hook, | |
1c524830 | 346 | t->u.kernel.target, |
fe1cb108 | 347 | t->data); |
1da177e4 LT |
348 | |
349 | #ifdef CONFIG_NETFILTER_DEBUG | |
350 | if (((struct ip6t_entry *)table_base)->comefrom | |
351 | != 0xeeeeeeec | |
352 | && verdict == IP6T_CONTINUE) { | |
353 | printk("Target %s reentered!\n", | |
354 | t->u.kernel.target->name); | |
355 | verdict = NF_DROP; | |
356 | } | |
357 | ((struct ip6t_entry *)table_base)->comefrom | |
358 | = 0x57acc001; | |
359 | #endif | |
360 | if (verdict == IP6T_CONTINUE) | |
361 | e = (void *)e + e->next_offset; | |
362 | else | |
363 | /* Verdict */ | |
364 | break; | |
365 | } | |
366 | } else { | |
367 | ||
368 | no_match: | |
369 | e = (void *)e + e->next_offset; | |
370 | } | |
371 | } while (!hotdrop); | |
372 | ||
373 | #ifdef CONFIG_NETFILTER_DEBUG | |
4bdbf6c0 | 374 | ((struct ip6t_entry *)table_base)->comefrom = NETFILTER_LINK_POISON; |
1da177e4 LT |
375 | #endif |
376 | read_unlock_bh(&table->lock); | |
377 | ||
378 | #ifdef DEBUG_ALLOW_ALL | |
379 | return NF_ACCEPT; | |
380 | #else | |
381 | if (hotdrop) | |
382 | return NF_DROP; | |
383 | else return verdict; | |
384 | #endif | |
385 | } | |
386 | ||
1da177e4 LT |
387 | /* All zeroes == unconditional rule. */ |
388 | static inline int | |
389 | unconditional(const struct ip6t_ip6 *ipv6) | |
390 | { | |
391 | unsigned int i; | |
392 | ||
393 | for (i = 0; i < sizeof(*ipv6); i++) | |
394 | if (((char *)ipv6)[i]) | |
395 | break; | |
396 | ||
397 | return (i == sizeof(*ipv6)); | |
398 | } | |
399 | ||
400 | /* Figures out from what hook each rule can be called: returns 0 if | |
401 | there are loops. Puts hook bitmask in comefrom. */ | |
402 | static int | |
2e4e6a17 | 403 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 404 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
405 | { |
406 | unsigned int hook; | |
407 | ||
408 | /* No recursion; use packet counter to save back ptrs (reset | |
409 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
410 | for (hook = 0; hook < NF_IP6_NUMHOOKS; hook++) { | |
411 | unsigned int pos = newinfo->hook_entry[hook]; | |
412 | struct ip6t_entry *e | |
31836064 | 413 | = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
414 | |
415 | if (!(valid_hooks & (1 << hook))) | |
416 | continue; | |
417 | ||
418 | /* Set initial back pointer. */ | |
419 | e->counters.pcnt = pos; | |
420 | ||
421 | for (;;) { | |
422 | struct ip6t_standard_target *t | |
423 | = (void *)ip6t_get_target(e); | |
424 | ||
425 | if (e->comefrom & (1 << NF_IP6_NUMHOOKS)) { | |
426 | printk("iptables: loop hook %u pos %u %08X.\n", | |
427 | hook, pos, e->comefrom); | |
428 | return 0; | |
429 | } | |
430 | e->comefrom | |
431 | |= ((1 << hook) | (1 << NF_IP6_NUMHOOKS)); | |
432 | ||
433 | /* Unconditional return/END. */ | |
434 | if (e->target_offset == sizeof(struct ip6t_entry) | |
435 | && (strcmp(t->target.u.user.name, | |
436 | IP6T_STANDARD_TARGET) == 0) | |
437 | && t->verdict < 0 | |
438 | && unconditional(&e->ipv6)) { | |
439 | unsigned int oldpos, size; | |
440 | ||
441 | /* Return: backtrack through the last | |
442 | big jump. */ | |
443 | do { | |
444 | e->comefrom ^= (1<<NF_IP6_NUMHOOKS); | |
445 | #ifdef DEBUG_IP_FIREWALL_USER | |
446 | if (e->comefrom | |
447 | & (1 << NF_IP6_NUMHOOKS)) { | |
448 | duprintf("Back unset " | |
449 | "on hook %u " | |
450 | "rule %u\n", | |
451 | hook, pos); | |
452 | } | |
453 | #endif | |
454 | oldpos = pos; | |
455 | pos = e->counters.pcnt; | |
456 | e->counters.pcnt = 0; | |
457 | ||
458 | /* We're at the start. */ | |
459 | if (pos == oldpos) | |
460 | goto next; | |
461 | ||
462 | e = (struct ip6t_entry *) | |
31836064 | 463 | (entry0 + pos); |
1da177e4 LT |
464 | } while (oldpos == pos + e->next_offset); |
465 | ||
466 | /* Move along one */ | |
467 | size = e->next_offset; | |
468 | e = (struct ip6t_entry *) | |
31836064 | 469 | (entry0 + pos + size); |
1da177e4 LT |
470 | e->counters.pcnt = pos; |
471 | pos += size; | |
472 | } else { | |
473 | int newpos = t->verdict; | |
474 | ||
475 | if (strcmp(t->target.u.user.name, | |
476 | IP6T_STANDARD_TARGET) == 0 | |
477 | && newpos >= 0) { | |
478 | /* This a jump; chase it. */ | |
479 | duprintf("Jump rule %u -> %u\n", | |
480 | pos, newpos); | |
481 | } else { | |
482 | /* ... this is a fallthru */ | |
483 | newpos = pos + e->next_offset; | |
484 | } | |
485 | e = (struct ip6t_entry *) | |
31836064 | 486 | (entry0 + newpos); |
1da177e4 LT |
487 | e->counters.pcnt = pos; |
488 | pos = newpos; | |
489 | } | |
490 | } | |
491 | next: | |
492 | duprintf("Finished chain %u\n", hook); | |
493 | } | |
494 | return 1; | |
495 | } | |
496 | ||
497 | static inline int | |
498 | cleanup_match(struct ip6t_entry_match *m, unsigned int *i) | |
499 | { | |
500 | if (i && (*i)-- == 0) | |
501 | return 1; | |
502 | ||
503 | if (m->u.kernel.match->destroy) | |
efa74165 | 504 | m->u.kernel.match->destroy(m->u.kernel.match, m->data); |
1da177e4 LT |
505 | module_put(m->u.kernel.match->me); |
506 | return 0; | |
507 | } | |
508 | ||
509 | static inline int | |
510 | standard_check(const struct ip6t_entry_target *t, | |
511 | unsigned int max_offset) | |
512 | { | |
513 | struct ip6t_standard_target *targ = (void *)t; | |
514 | ||
515 | /* Check standard info. */ | |
1da177e4 LT |
516 | if (targ->verdict >= 0 |
517 | && targ->verdict > max_offset - sizeof(struct ip6t_entry)) { | |
518 | duprintf("ip6t_standard_check: bad verdict (%i)\n", | |
519 | targ->verdict); | |
520 | return 0; | |
521 | } | |
1da177e4 LT |
522 | if (targ->verdict < -NF_MAX_VERDICT - 1) { |
523 | duprintf("ip6t_standard_check: bad negative verdict (%i)\n", | |
524 | targ->verdict); | |
525 | return 0; | |
526 | } | |
527 | return 1; | |
528 | } | |
529 | ||
530 | static inline int | |
531 | check_match(struct ip6t_entry_match *m, | |
532 | const char *name, | |
533 | const struct ip6t_ip6 *ipv6, | |
534 | unsigned int hookmask, | |
535 | unsigned int *i) | |
536 | { | |
1da177e4 | 537 | struct ip6t_match *match; |
3cdc7c95 | 538 | int ret; |
1da177e4 | 539 | |
2e4e6a17 HW |
540 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, |
541 | m->u.user.revision), | |
6b7d31fc HW |
542 | "ip6t_%s", m->u.user.name); |
543 | if (IS_ERR(match) || !match) { | |
2e4e6a17 | 544 | duprintf("check_match: `%s' not found\n", m->u.user.name); |
6b7d31fc | 545 | return match ? PTR_ERR(match) : -ENOENT; |
1da177e4 LT |
546 | } |
547 | m->u.kernel.match = match; | |
1da177e4 | 548 | |
3cdc7c95 PM |
549 | ret = xt_check_match(match, AF_INET6, m->u.match_size - sizeof(*m), |
550 | name, hookmask, ipv6->proto, | |
551 | ipv6->invflags & IP6T_INV_PROTO); | |
552 | if (ret) | |
553 | goto err; | |
554 | ||
1da177e4 | 555 | if (m->u.kernel.match->checkentry |
1c524830 | 556 | && !m->u.kernel.match->checkentry(name, ipv6, match, m->data, |
1da177e4 | 557 | hookmask)) { |
1da177e4 LT |
558 | duprintf("ip_tables: check failed for `%s'.\n", |
559 | m->u.kernel.match->name); | |
3cdc7c95 PM |
560 | ret = -EINVAL; |
561 | goto err; | |
1da177e4 LT |
562 | } |
563 | ||
564 | (*i)++; | |
565 | return 0; | |
3cdc7c95 PM |
566 | err: |
567 | module_put(m->u.kernel.match->me); | |
568 | return ret; | |
1da177e4 LT |
569 | } |
570 | ||
571 | static struct ip6t_target ip6t_standard_target; | |
572 | ||
573 | static inline int | |
574 | check_entry(struct ip6t_entry *e, const char *name, unsigned int size, | |
575 | unsigned int *i) | |
576 | { | |
577 | struct ip6t_entry_target *t; | |
578 | struct ip6t_target *target; | |
579 | int ret; | |
580 | unsigned int j; | |
581 | ||
582 | if (!ip6_checkentry(&e->ipv6)) { | |
583 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
584 | return -EINVAL; | |
585 | } | |
586 | ||
587 | j = 0; | |
588 | ret = IP6T_MATCH_ITERATE(e, check_match, name, &e->ipv6, e->comefrom, &j); | |
589 | if (ret != 0) | |
590 | goto cleanup_matches; | |
591 | ||
592 | t = ip6t_get_target(e); | |
2e4e6a17 HW |
593 | target = try_then_request_module(xt_find_target(AF_INET6, |
594 | t->u.user.name, | |
595 | t->u.user.revision), | |
6b7d31fc HW |
596 | "ip6t_%s", t->u.user.name); |
597 | if (IS_ERR(target) || !target) { | |
1da177e4 | 598 | duprintf("check_entry: `%s' not found\n", t->u.user.name); |
6b7d31fc | 599 | ret = target ? PTR_ERR(target) : -ENOENT; |
1da177e4 LT |
600 | goto cleanup_matches; |
601 | } | |
602 | t->u.kernel.target = target; | |
6b7d31fc | 603 | |
3cdc7c95 PM |
604 | ret = xt_check_target(target, AF_INET6, t->u.target_size - sizeof(*t), |
605 | name, e->comefrom, e->ipv6.proto, | |
606 | e->ipv6.invflags & IP6T_INV_PROTO); | |
607 | if (ret) | |
608 | goto err; | |
609 | ||
1da177e4 LT |
610 | if (t->u.kernel.target == &ip6t_standard_target) { |
611 | if (!standard_check(t, size)) { | |
612 | ret = -EINVAL; | |
90d47db4 | 613 | goto err; |
1da177e4 LT |
614 | } |
615 | } else if (t->u.kernel.target->checkentry | |
1c524830 | 616 | && !t->u.kernel.target->checkentry(name, e, target, t->data, |
1da177e4 | 617 | e->comefrom)) { |
1da177e4 LT |
618 | duprintf("ip_tables: check failed for `%s'.\n", |
619 | t->u.kernel.target->name); | |
620 | ret = -EINVAL; | |
3cdc7c95 | 621 | goto err; |
1da177e4 LT |
622 | } |
623 | ||
624 | (*i)++; | |
625 | return 0; | |
3cdc7c95 PM |
626 | err: |
627 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
628 | cleanup_matches: |
629 | IP6T_MATCH_ITERATE(e, cleanup_match, &j); | |
630 | return ret; | |
631 | } | |
632 | ||
633 | static inline int | |
634 | check_entry_size_and_hooks(struct ip6t_entry *e, | |
2e4e6a17 | 635 | struct xt_table_info *newinfo, |
1da177e4 LT |
636 | unsigned char *base, |
637 | unsigned char *limit, | |
638 | const unsigned int *hook_entries, | |
639 | const unsigned int *underflows, | |
640 | unsigned int *i) | |
641 | { | |
642 | unsigned int h; | |
643 | ||
644 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 | |
645 | || (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
646 | duprintf("Bad offset %p\n", e); | |
647 | return -EINVAL; | |
648 | } | |
649 | ||
650 | if (e->next_offset | |
651 | < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) { | |
652 | duprintf("checking: element %p size %u\n", | |
653 | e, e->next_offset); | |
654 | return -EINVAL; | |
655 | } | |
656 | ||
657 | /* Check hooks & underflows */ | |
658 | for (h = 0; h < NF_IP6_NUMHOOKS; h++) { | |
659 | if ((unsigned char *)e - base == hook_entries[h]) | |
660 | newinfo->hook_entry[h] = hook_entries[h]; | |
661 | if ((unsigned char *)e - base == underflows[h]) | |
662 | newinfo->underflow[h] = underflows[h]; | |
663 | } | |
664 | ||
665 | /* FIXME: underflows must be unconditional, standard verdicts | |
666 | < 0 (not IP6T_RETURN). --RR */ | |
667 | ||
668 | /* Clear counters and comefrom */ | |
2e4e6a17 | 669 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
670 | e->comefrom = 0; |
671 | ||
672 | (*i)++; | |
673 | return 0; | |
674 | } | |
675 | ||
676 | static inline int | |
677 | cleanup_entry(struct ip6t_entry *e, unsigned int *i) | |
678 | { | |
679 | struct ip6t_entry_target *t; | |
680 | ||
681 | if (i && (*i)-- == 0) | |
682 | return 1; | |
683 | ||
684 | /* Cleanup all matches */ | |
685 | IP6T_MATCH_ITERATE(e, cleanup_match, NULL); | |
686 | t = ip6t_get_target(e); | |
687 | if (t->u.kernel.target->destroy) | |
efa74165 | 688 | t->u.kernel.target->destroy(t->u.kernel.target, t->data); |
1da177e4 LT |
689 | module_put(t->u.kernel.target->me); |
690 | return 0; | |
691 | } | |
692 | ||
693 | /* Checks and translates the user-supplied table segment (held in | |
694 | newinfo) */ | |
695 | static int | |
696 | translate_table(const char *name, | |
697 | unsigned int valid_hooks, | |
2e4e6a17 | 698 | struct xt_table_info *newinfo, |
31836064 | 699 | void *entry0, |
1da177e4 LT |
700 | unsigned int size, |
701 | unsigned int number, | |
702 | const unsigned int *hook_entries, | |
703 | const unsigned int *underflows) | |
704 | { | |
705 | unsigned int i; | |
706 | int ret; | |
707 | ||
708 | newinfo->size = size; | |
709 | newinfo->number = number; | |
710 | ||
711 | /* Init all hooks to impossible value. */ | |
712 | for (i = 0; i < NF_IP6_NUMHOOKS; i++) { | |
713 | newinfo->hook_entry[i] = 0xFFFFFFFF; | |
714 | newinfo->underflow[i] = 0xFFFFFFFF; | |
715 | } | |
716 | ||
717 | duprintf("translate_table: size %u\n", newinfo->size); | |
718 | i = 0; | |
719 | /* Walk through entries, checking offsets. */ | |
31836064 | 720 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
721 | check_entry_size_and_hooks, |
722 | newinfo, | |
31836064 ED |
723 | entry0, |
724 | entry0 + size, | |
1da177e4 LT |
725 | hook_entries, underflows, &i); |
726 | if (ret != 0) | |
727 | return ret; | |
728 | ||
729 | if (i != number) { | |
730 | duprintf("translate_table: %u not %u entries\n", | |
731 | i, number); | |
732 | return -EINVAL; | |
733 | } | |
734 | ||
735 | /* Check hooks all assigned */ | |
736 | for (i = 0; i < NF_IP6_NUMHOOKS; i++) { | |
737 | /* Only hooks which are valid */ | |
738 | if (!(valid_hooks & (1 << i))) | |
739 | continue; | |
740 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
741 | duprintf("Invalid hook entry %u %u\n", | |
742 | i, hook_entries[i]); | |
743 | return -EINVAL; | |
744 | } | |
745 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
746 | duprintf("Invalid underflow %u %u\n", | |
747 | i, underflows[i]); | |
748 | return -EINVAL; | |
749 | } | |
750 | } | |
751 | ||
31836064 | 752 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
1da177e4 LT |
753 | return -ELOOP; |
754 | ||
755 | /* Finally, each sanity check must pass */ | |
756 | i = 0; | |
31836064 | 757 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
758 | check_entry, name, size, &i); |
759 | ||
760 | if (ret != 0) { | |
31836064 | 761 | IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
762 | cleanup_entry, &i); |
763 | return ret; | |
764 | } | |
765 | ||
766 | /* And one copy for every other CPU */ | |
6f912042 | 767 | for_each_possible_cpu(i) { |
31836064 ED |
768 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
769 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
770 | } |
771 | ||
772 | return ret; | |
773 | } | |
774 | ||
1da177e4 LT |
775 | /* Gets counters. */ |
776 | static inline int | |
777 | add_entry_to_counter(const struct ip6t_entry *e, | |
2e4e6a17 | 778 | struct xt_counters total[], |
1da177e4 LT |
779 | unsigned int *i) |
780 | { | |
781 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
782 | ||
783 | (*i)++; | |
784 | return 0; | |
785 | } | |
786 | ||
31836064 ED |
787 | static inline int |
788 | set_entry_to_counter(const struct ip6t_entry *e, | |
789 | struct ip6t_counters total[], | |
790 | unsigned int *i) | |
791 | { | |
792 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
793 | ||
794 | (*i)++; | |
795 | return 0; | |
796 | } | |
797 | ||
1da177e4 | 798 | static void |
2e4e6a17 HW |
799 | get_counters(const struct xt_table_info *t, |
800 | struct xt_counters counters[]) | |
1da177e4 LT |
801 | { |
802 | unsigned int cpu; | |
803 | unsigned int i; | |
31836064 ED |
804 | unsigned int curcpu; |
805 | ||
806 | /* Instead of clearing (by a previous call to memset()) | |
807 | * the counters and using adds, we set the counters | |
808 | * with data used by 'current' CPU | |
809 | * We dont care about preemption here. | |
810 | */ | |
811 | curcpu = raw_smp_processor_id(); | |
812 | ||
813 | i = 0; | |
814 | IP6T_ENTRY_ITERATE(t->entries[curcpu], | |
815 | t->size, | |
816 | set_entry_to_counter, | |
817 | counters, | |
818 | &i); | |
1da177e4 | 819 | |
6f912042 | 820 | for_each_possible_cpu(cpu) { |
31836064 ED |
821 | if (cpu == curcpu) |
822 | continue; | |
1da177e4 | 823 | i = 0; |
31836064 | 824 | IP6T_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
825 | t->size, |
826 | add_entry_to_counter, | |
827 | counters, | |
828 | &i); | |
829 | } | |
830 | } | |
831 | ||
832 | static int | |
833 | copy_entries_to_user(unsigned int total_size, | |
2e4e6a17 | 834 | struct xt_table *table, |
1da177e4 LT |
835 | void __user *userptr) |
836 | { | |
837 | unsigned int off, num, countersize; | |
838 | struct ip6t_entry *e; | |
2e4e6a17 HW |
839 | struct xt_counters *counters; |
840 | struct xt_table_info *private = table->private; | |
1da177e4 | 841 | int ret = 0; |
31836064 | 842 | void *loc_cpu_entry; |
1da177e4 LT |
843 | |
844 | /* We need atomic snapshot of counters: rest doesn't change | |
845 | (other than comefrom, which userspace doesn't care | |
846 | about). */ | |
2e4e6a17 | 847 | countersize = sizeof(struct xt_counters) * private->number; |
1da177e4 LT |
848 | counters = vmalloc(countersize); |
849 | ||
850 | if (counters == NULL) | |
851 | return -ENOMEM; | |
852 | ||
853 | /* First, sum counters... */ | |
1da177e4 | 854 | write_lock_bh(&table->lock); |
2e4e6a17 | 855 | get_counters(private, counters); |
1da177e4 LT |
856 | write_unlock_bh(&table->lock); |
857 | ||
31836064 | 858 | /* choose the copy that is on ourc node/cpu */ |
2e4e6a17 | 859 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 860 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
861 | ret = -EFAULT; |
862 | goto free_counters; | |
863 | } | |
864 | ||
865 | /* FIXME: use iterator macros --RR */ | |
866 | /* ... then go back and fix counters and names */ | |
867 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
868 | unsigned int i; | |
869 | struct ip6t_entry_match *m; | |
870 | struct ip6t_entry_target *t; | |
871 | ||
31836064 | 872 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
873 | if (copy_to_user(userptr + off |
874 | + offsetof(struct ip6t_entry, counters), | |
875 | &counters[num], | |
876 | sizeof(counters[num])) != 0) { | |
877 | ret = -EFAULT; | |
878 | goto free_counters; | |
879 | } | |
880 | ||
881 | for (i = sizeof(struct ip6t_entry); | |
882 | i < e->target_offset; | |
883 | i += m->u.match_size) { | |
884 | m = (void *)e + i; | |
885 | ||
886 | if (copy_to_user(userptr + off + i | |
887 | + offsetof(struct ip6t_entry_match, | |
888 | u.user.name), | |
889 | m->u.kernel.match->name, | |
890 | strlen(m->u.kernel.match->name)+1) | |
891 | != 0) { | |
892 | ret = -EFAULT; | |
893 | goto free_counters; | |
894 | } | |
895 | } | |
896 | ||
897 | t = ip6t_get_target(e); | |
898 | if (copy_to_user(userptr + off + e->target_offset | |
899 | + offsetof(struct ip6t_entry_target, | |
900 | u.user.name), | |
901 | t->u.kernel.target->name, | |
902 | strlen(t->u.kernel.target->name)+1) != 0) { | |
903 | ret = -EFAULT; | |
904 | goto free_counters; | |
905 | } | |
906 | } | |
907 | ||
908 | free_counters: | |
909 | vfree(counters); | |
910 | return ret; | |
911 | } | |
912 | ||
913 | static int | |
914 | get_entries(const struct ip6t_get_entries *entries, | |
915 | struct ip6t_get_entries __user *uptr) | |
916 | { | |
917 | int ret; | |
2e4e6a17 | 918 | struct xt_table *t; |
1da177e4 | 919 | |
2e4e6a17 | 920 | t = xt_find_table_lock(AF_INET6, entries->name); |
6b7d31fc | 921 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
922 | struct xt_table_info *private = t->private; |
923 | duprintf("t->private->number = %u\n", private->number); | |
924 | if (entries->size == private->size) | |
925 | ret = copy_entries_to_user(private->size, | |
1da177e4 LT |
926 | t, uptr->entrytable); |
927 | else { | |
928 | duprintf("get_entries: I've got %u not %u!\n", | |
2e4e6a17 | 929 | private->size, entries->size); |
1da177e4 LT |
930 | ret = -EINVAL; |
931 | } | |
6b7d31fc | 932 | module_put(t->me); |
2e4e6a17 | 933 | xt_table_unlock(t); |
1da177e4 | 934 | } else |
6b7d31fc | 935 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
936 | |
937 | return ret; | |
938 | } | |
939 | ||
940 | static int | |
941 | do_replace(void __user *user, unsigned int len) | |
942 | { | |
943 | int ret; | |
944 | struct ip6t_replace tmp; | |
2e4e6a17 HW |
945 | struct xt_table *t; |
946 | struct xt_table_info *newinfo, *oldinfo; | |
947 | struct xt_counters *counters; | |
31836064 | 948 | void *loc_cpu_entry, *loc_cpu_old_entry; |
1da177e4 LT |
949 | |
950 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
951 | return -EFAULT; | |
952 | ||
ee4bb818 KK |
953 | /* overflow check */ |
954 | if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS - | |
955 | SMP_CACHE_BYTES) | |
956 | return -ENOMEM; | |
957 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
958 | return -ENOMEM; | |
959 | ||
2e4e6a17 | 960 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
961 | if (!newinfo) |
962 | return -ENOMEM; | |
963 | ||
31836064 ED |
964 | /* choose the copy that is on our node/cpu */ |
965 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
966 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
967 | tmp.size) != 0) { |
968 | ret = -EFAULT; | |
969 | goto free_newinfo; | |
970 | } | |
971 | ||
2e4e6a17 | 972 | counters = vmalloc(tmp.num_counters * sizeof(struct xt_counters)); |
1da177e4 LT |
973 | if (!counters) { |
974 | ret = -ENOMEM; | |
975 | goto free_newinfo; | |
976 | } | |
1da177e4 LT |
977 | |
978 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
31836064 | 979 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, |
1da177e4 LT |
980 | tmp.hook_entry, tmp.underflow); |
981 | if (ret != 0) | |
982 | goto free_newinfo_counters; | |
983 | ||
984 | duprintf("ip_tables: Translated table\n"); | |
985 | ||
2e4e6a17 | 986 | t = try_then_request_module(xt_find_table_lock(AF_INET6, tmp.name), |
6b7d31fc HW |
987 | "ip6table_%s", tmp.name); |
988 | if (!t || IS_ERR(t)) { | |
989 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 990 | goto free_newinfo_counters_untrans; |
6b7d31fc | 991 | } |
1da177e4 LT |
992 | |
993 | /* You lied! */ | |
994 | if (tmp.valid_hooks != t->valid_hooks) { | |
995 | duprintf("Valid hook crap: %08X vs %08X\n", | |
996 | tmp.valid_hooks, t->valid_hooks); | |
997 | ret = -EINVAL; | |
6b7d31fc | 998 | goto put_module; |
1da177e4 LT |
999 | } |
1000 | ||
2e4e6a17 | 1001 | oldinfo = xt_replace_table(t, tmp.num_counters, newinfo, &ret); |
1da177e4 LT |
1002 | if (!oldinfo) |
1003 | goto put_module; | |
1004 | ||
1005 | /* Update module usage count based on number of rules */ | |
1006 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1007 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1008 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1009 | (newinfo->number <= oldinfo->initial_entries)) | |
1010 | module_put(t->me); | |
1011 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1012 | (newinfo->number <= oldinfo->initial_entries)) | |
1013 | module_put(t->me); | |
1014 | ||
1015 | /* Get the old counters. */ | |
1016 | get_counters(oldinfo, counters); | |
1017 | /* Decrease module usage counts and free resource */ | |
31836064 ED |
1018 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
1019 | IP6T_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL); | |
2e4e6a17 | 1020 | xt_free_table_info(oldinfo); |
1da177e4 | 1021 | if (copy_to_user(tmp.counters, counters, |
2e4e6a17 | 1022 | sizeof(struct xt_counters) * tmp.num_counters) != 0) |
1da177e4 LT |
1023 | ret = -EFAULT; |
1024 | vfree(counters); | |
2e4e6a17 | 1025 | xt_table_unlock(t); |
1da177e4 LT |
1026 | return ret; |
1027 | ||
1028 | put_module: | |
1029 | module_put(t->me); | |
2e4e6a17 | 1030 | xt_table_unlock(t); |
1da177e4 | 1031 | free_newinfo_counters_untrans: |
31836064 | 1032 | IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL); |
1da177e4 LT |
1033 | free_newinfo_counters: |
1034 | vfree(counters); | |
1035 | free_newinfo: | |
2e4e6a17 | 1036 | xt_free_table_info(newinfo); |
1da177e4 LT |
1037 | return ret; |
1038 | } | |
1039 | ||
1040 | /* We're lazy, and add to the first CPU; overflow works its fey magic | |
1041 | * and everything is OK. */ | |
1042 | static inline int | |
1043 | add_counter_to_entry(struct ip6t_entry *e, | |
2e4e6a17 | 1044 | const struct xt_counters addme[], |
1da177e4 LT |
1045 | unsigned int *i) |
1046 | { | |
1047 | #if 0 | |
1048 | duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n", | |
1049 | *i, | |
1050 | (long unsigned int)e->counters.pcnt, | |
1051 | (long unsigned int)e->counters.bcnt, | |
1052 | (long unsigned int)addme[*i].pcnt, | |
1053 | (long unsigned int)addme[*i].bcnt); | |
1054 | #endif | |
1055 | ||
1056 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1057 | ||
1058 | (*i)++; | |
1059 | return 0; | |
1060 | } | |
1061 | ||
1062 | static int | |
1063 | do_add_counters(void __user *user, unsigned int len) | |
1064 | { | |
1065 | unsigned int i; | |
2e4e6a17 HW |
1066 | struct xt_counters_info tmp, *paddc; |
1067 | struct xt_table_info *private; | |
1068 | struct xt_table *t; | |
6b7d31fc | 1069 | int ret = 0; |
31836064 | 1070 | void *loc_cpu_entry; |
1da177e4 LT |
1071 | |
1072 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1073 | return -EFAULT; | |
1074 | ||
2e4e6a17 | 1075 | if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct xt_counters)) |
1da177e4 LT |
1076 | return -EINVAL; |
1077 | ||
1078 | paddc = vmalloc(len); | |
1079 | if (!paddc) | |
1080 | return -ENOMEM; | |
1081 | ||
1082 | if (copy_from_user(paddc, user, len) != 0) { | |
1083 | ret = -EFAULT; | |
1084 | goto free; | |
1085 | } | |
1086 | ||
2e4e6a17 | 1087 | t = xt_find_table_lock(AF_INET6, tmp.name); |
6b7d31fc HW |
1088 | if (!t || IS_ERR(t)) { |
1089 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1090 | goto free; |
6b7d31fc | 1091 | } |
1da177e4 LT |
1092 | |
1093 | write_lock_bh(&t->lock); | |
2e4e6a17 | 1094 | private = t->private; |
2c8ac66b | 1095 | if (private->number != tmp.num_counters) { |
1da177e4 LT |
1096 | ret = -EINVAL; |
1097 | goto unlock_up_free; | |
1098 | } | |
1099 | ||
1100 | i = 0; | |
31836064 | 1101 | /* Choose the copy that is on our node */ |
2e4e6a17 | 1102 | loc_cpu_entry = private->entries[smp_processor_id()]; |
31836064 | 1103 | IP6T_ENTRY_ITERATE(loc_cpu_entry, |
2e4e6a17 | 1104 | private->size, |
1da177e4 LT |
1105 | add_counter_to_entry, |
1106 | paddc->counters, | |
1107 | &i); | |
1108 | unlock_up_free: | |
1109 | write_unlock_bh(&t->lock); | |
2e4e6a17 | 1110 | xt_table_unlock(t); |
6b7d31fc | 1111 | module_put(t->me); |
1da177e4 LT |
1112 | free: |
1113 | vfree(paddc); | |
1114 | ||
1115 | return ret; | |
1116 | } | |
1117 | ||
1118 | static int | |
1119 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
1120 | { | |
1121 | int ret; | |
1122 | ||
1123 | if (!capable(CAP_NET_ADMIN)) | |
1124 | return -EPERM; | |
1125 | ||
1126 | switch (cmd) { | |
1127 | case IP6T_SO_SET_REPLACE: | |
1128 | ret = do_replace(user, len); | |
1129 | break; | |
1130 | ||
1131 | case IP6T_SO_SET_ADD_COUNTERS: | |
1132 | ret = do_add_counters(user, len); | |
1133 | break; | |
1134 | ||
1135 | default: | |
1136 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1137 | ret = -EINVAL; | |
1138 | } | |
1139 | ||
1140 | return ret; | |
1141 | } | |
1142 | ||
1143 | static int | |
1144 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1145 | { | |
1146 | int ret; | |
1147 | ||
1148 | if (!capable(CAP_NET_ADMIN)) | |
1149 | return -EPERM; | |
1150 | ||
1151 | switch (cmd) { | |
1152 | case IP6T_SO_GET_INFO: { | |
1153 | char name[IP6T_TABLE_MAXNAMELEN]; | |
2e4e6a17 | 1154 | struct xt_table *t; |
1da177e4 LT |
1155 | |
1156 | if (*len != sizeof(struct ip6t_getinfo)) { | |
1157 | duprintf("length %u != %u\n", *len, | |
1158 | sizeof(struct ip6t_getinfo)); | |
1159 | ret = -EINVAL; | |
1160 | break; | |
1161 | } | |
1162 | ||
1163 | if (copy_from_user(name, user, sizeof(name)) != 0) { | |
1164 | ret = -EFAULT; | |
1165 | break; | |
1166 | } | |
1167 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; | |
6b7d31fc | 1168 | |
2e4e6a17 | 1169 | t = try_then_request_module(xt_find_table_lock(AF_INET6, name), |
6b7d31fc HW |
1170 | "ip6table_%s", name); |
1171 | if (t && !IS_ERR(t)) { | |
1da177e4 | 1172 | struct ip6t_getinfo info; |
2e4e6a17 | 1173 | struct xt_table_info *private = t->private; |
1da177e4 LT |
1174 | |
1175 | info.valid_hooks = t->valid_hooks; | |
2e4e6a17 | 1176 | memcpy(info.hook_entry, private->hook_entry, |
1da177e4 | 1177 | sizeof(info.hook_entry)); |
2e4e6a17 | 1178 | memcpy(info.underflow, private->underflow, |
1da177e4 | 1179 | sizeof(info.underflow)); |
2e4e6a17 HW |
1180 | info.num_entries = private->number; |
1181 | info.size = private->size; | |
1da177e4 LT |
1182 | memcpy(info.name, name, sizeof(info.name)); |
1183 | ||
1184 | if (copy_to_user(user, &info, *len) != 0) | |
1185 | ret = -EFAULT; | |
1186 | else | |
1187 | ret = 0; | |
2e4e6a17 | 1188 | xt_table_unlock(t); |
6b7d31fc HW |
1189 | module_put(t->me); |
1190 | } else | |
1191 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 LT |
1192 | } |
1193 | break; | |
1194 | ||
1195 | case IP6T_SO_GET_ENTRIES: { | |
1196 | struct ip6t_get_entries get; | |
1197 | ||
1198 | if (*len < sizeof(get)) { | |
1199 | duprintf("get_entries: %u < %u\n", *len, sizeof(get)); | |
1200 | ret = -EINVAL; | |
1201 | } else if (copy_from_user(&get, user, sizeof(get)) != 0) { | |
1202 | ret = -EFAULT; | |
1203 | } else if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
1204 | duprintf("get_entries: %u != %u\n", *len, | |
1205 | sizeof(struct ip6t_get_entries) + get.size); | |
1206 | ret = -EINVAL; | |
1207 | } else | |
1208 | ret = get_entries(&get, user); | |
1209 | break; | |
1210 | } | |
1211 | ||
6b7d31fc HW |
1212 | case IP6T_SO_GET_REVISION_MATCH: |
1213 | case IP6T_SO_GET_REVISION_TARGET: { | |
1214 | struct ip6t_get_revision rev; | |
2e4e6a17 | 1215 | int target; |
6b7d31fc HW |
1216 | |
1217 | if (*len != sizeof(rev)) { | |
1218 | ret = -EINVAL; | |
1219 | break; | |
1220 | } | |
1221 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1222 | ret = -EFAULT; | |
1223 | break; | |
1224 | } | |
1225 | ||
1226 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 1227 | target = 1; |
6b7d31fc | 1228 | else |
2e4e6a17 | 1229 | target = 0; |
6b7d31fc | 1230 | |
2e4e6a17 HW |
1231 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
1232 | rev.revision, | |
1233 | target, &ret), | |
6b7d31fc HW |
1234 | "ip6t_%s", rev.name); |
1235 | break; | |
1236 | } | |
1237 | ||
1da177e4 LT |
1238 | default: |
1239 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
1240 | ret = -EINVAL; | |
1241 | } | |
1242 | ||
1243 | return ret; | |
1244 | } | |
1245 | ||
2e4e6a17 | 1246 | int ip6t_register_table(struct xt_table *table, |
1da177e4 LT |
1247 | const struct ip6t_replace *repl) |
1248 | { | |
1249 | int ret; | |
2e4e6a17 HW |
1250 | struct xt_table_info *newinfo; |
1251 | static struct xt_table_info bootstrap | |
1da177e4 | 1252 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 1253 | void *loc_cpu_entry; |
1da177e4 | 1254 | |
2e4e6a17 | 1255 | newinfo = xt_alloc_table_info(repl->size); |
1da177e4 LT |
1256 | if (!newinfo) |
1257 | return -ENOMEM; | |
1258 | ||
31836064 ED |
1259 | /* choose the copy on our node/cpu */ |
1260 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1261 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
1262 | |
1263 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 1264 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
1265 | repl->num_entries, |
1266 | repl->hook_entry, | |
1267 | repl->underflow); | |
1268 | if (ret != 0) { | |
2e4e6a17 | 1269 | xt_free_table_info(newinfo); |
1da177e4 LT |
1270 | return ret; |
1271 | } | |
1272 | ||
da298d3a PM |
1273 | ret = xt_register_table(table, &bootstrap, newinfo); |
1274 | if (ret != 0) { | |
2e4e6a17 | 1275 | xt_free_table_info(newinfo); |
1da177e4 LT |
1276 | return ret; |
1277 | } | |
1278 | ||
2e4e6a17 | 1279 | return 0; |
1da177e4 LT |
1280 | } |
1281 | ||
2e4e6a17 | 1282 | void ip6t_unregister_table(struct xt_table *table) |
1da177e4 | 1283 | { |
2e4e6a17 | 1284 | struct xt_table_info *private; |
31836064 ED |
1285 | void *loc_cpu_entry; |
1286 | ||
2e4e6a17 | 1287 | private = xt_unregister_table(table); |
1da177e4 LT |
1288 | |
1289 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
1290 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
1291 | IP6T_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
1292 | xt_free_table_info(private); | |
1da177e4 LT |
1293 | } |
1294 | ||
1295 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1296 | static inline int | |
1297 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, | |
1298 | u_int8_t type, u_int8_t code, | |
1299 | int invert) | |
1300 | { | |
1301 | return (type == test_type && code >= min_code && code <= max_code) | |
1302 | ^ invert; | |
1303 | } | |
1304 | ||
1305 | static int | |
1306 | icmp6_match(const struct sk_buff *skb, | |
1307 | const struct net_device *in, | |
1308 | const struct net_device *out, | |
c4986734 | 1309 | const struct xt_match *match, |
1da177e4 LT |
1310 | const void *matchinfo, |
1311 | int offset, | |
1312 | unsigned int protoff, | |
1313 | int *hotdrop) | |
1314 | { | |
1315 | struct icmp6hdr _icmp, *ic; | |
1316 | const struct ip6t_icmp *icmpinfo = matchinfo; | |
1317 | ||
1318 | /* Must not be a fragment. */ | |
1319 | if (offset) | |
1320 | return 0; | |
1321 | ||
1322 | ic = skb_header_pointer(skb, protoff, sizeof(_icmp), &_icmp); | |
1323 | if (ic == NULL) { | |
1324 | /* We've been asked to examine this packet, and we | |
1325 | can't. Hence, no choice but to drop. */ | |
1326 | duprintf("Dropping evil ICMP tinygram.\n"); | |
1327 | *hotdrop = 1; | |
1328 | return 0; | |
1329 | } | |
1330 | ||
1331 | return icmp6_type_code_match(icmpinfo->type, | |
1332 | icmpinfo->code[0], | |
1333 | icmpinfo->code[1], | |
1334 | ic->icmp6_type, ic->icmp6_code, | |
1335 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
1336 | } | |
1337 | ||
1338 | /* Called when user tries to insert an entry of this type. */ | |
1339 | static int | |
1340 | icmp6_checkentry(const char *tablename, | |
2e4e6a17 | 1341 | const void *entry, |
c4986734 | 1342 | const struct xt_match *match, |
1da177e4 | 1343 | void *matchinfo, |
1da177e4 LT |
1344 | unsigned int hook_mask) |
1345 | { | |
1346 | const struct ip6t_icmp *icmpinfo = matchinfo; | |
1347 | ||
7f939713 PM |
1348 | /* Must specify no unknown invflags */ |
1349 | return !(icmpinfo->invflags & ~IP6T_ICMP_INV); | |
1da177e4 LT |
1350 | } |
1351 | ||
1352 | /* The built-in targets: standard (NULL) and error. */ | |
1353 | static struct ip6t_target ip6t_standard_target = { | |
1354 | .name = IP6T_STANDARD_TARGET, | |
7f939713 | 1355 | .targetsize = sizeof(int), |
a45049c5 | 1356 | .family = AF_INET6, |
1da177e4 LT |
1357 | }; |
1358 | ||
1359 | static struct ip6t_target ip6t_error_target = { | |
1360 | .name = IP6T_ERROR_TARGET, | |
1361 | .target = ip6t_error, | |
7f939713 | 1362 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, |
a45049c5 | 1363 | .family = AF_INET6, |
1da177e4 LT |
1364 | }; |
1365 | ||
1366 | static struct nf_sockopt_ops ip6t_sockopts = { | |
1367 | .pf = PF_INET6, | |
1368 | .set_optmin = IP6T_BASE_CTL, | |
1369 | .set_optmax = IP6T_SO_SET_MAX+1, | |
1370 | .set = do_ip6t_set_ctl, | |
1371 | .get_optmin = IP6T_BASE_CTL, | |
1372 | .get_optmax = IP6T_SO_GET_MAX+1, | |
1373 | .get = do_ip6t_get_ctl, | |
1374 | }; | |
1375 | ||
1da177e4 LT |
1376 | static struct ip6t_match icmp6_matchstruct = { |
1377 | .name = "icmp6", | |
1378 | .match = &icmp6_match, | |
7f939713 PM |
1379 | .matchsize = sizeof(struct ip6t_icmp), |
1380 | .checkentry = icmp6_checkentry, | |
1381 | .proto = IPPROTO_ICMPV6, | |
a45049c5 | 1382 | .family = AF_INET6, |
1da177e4 LT |
1383 | }; |
1384 | ||
65b4b4e8 | 1385 | static int __init ip6_tables_init(void) |
1da177e4 LT |
1386 | { |
1387 | int ret; | |
1388 | ||
0eff66e6 PM |
1389 | ret = xt_proto_init(AF_INET6); |
1390 | if (ret < 0) | |
1391 | goto err1; | |
2e4e6a17 | 1392 | |
1da177e4 | 1393 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
1394 | ret = xt_register_target(&ip6t_standard_target); |
1395 | if (ret < 0) | |
1396 | goto err2; | |
1397 | ret = xt_register_target(&ip6t_error_target); | |
1398 | if (ret < 0) | |
1399 | goto err3; | |
1400 | ret = xt_register_match(&icmp6_matchstruct); | |
1401 | if (ret < 0) | |
1402 | goto err4; | |
1da177e4 LT |
1403 | |
1404 | /* Register setsockopt */ | |
1405 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
1406 | if (ret < 0) |
1407 | goto err5; | |
1da177e4 | 1408 | |
2e4e6a17 | 1409 | printk("ip6_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 1410 | return 0; |
0eff66e6 PM |
1411 | |
1412 | err5: | |
1413 | xt_unregister_match(&icmp6_matchstruct); | |
1414 | err4: | |
1415 | xt_unregister_target(&ip6t_error_target); | |
1416 | err3: | |
1417 | xt_unregister_target(&ip6t_standard_target); | |
1418 | err2: | |
1419 | xt_proto_fini(AF_INET6); | |
1420 | err1: | |
1421 | return ret; | |
1da177e4 LT |
1422 | } |
1423 | ||
65b4b4e8 | 1424 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
1425 | { |
1426 | nf_unregister_sockopt(&ip6t_sockopts); | |
a45049c5 PNA |
1427 | xt_unregister_match(&icmp6_matchstruct); |
1428 | xt_unregister_target(&ip6t_error_target); | |
1429 | xt_unregister_target(&ip6t_standard_target); | |
2e4e6a17 | 1430 | xt_proto_fini(AF_INET6); |
1da177e4 LT |
1431 | } |
1432 | ||
e674d0f3 | 1433 | /* |
b777e0ce PM |
1434 | * find the offset to specified header or the protocol number of last header |
1435 | * if target < 0. "last header" is transport protocol header, ESP, or | |
1436 | * "No next header". | |
1437 | * | |
1438 | * If target header is found, its offset is set in *offset and return protocol | |
1439 | * number. Otherwise, return -1. | |
1440 | * | |
1441 | * Note that non-1st fragment is special case that "the protocol number | |
1442 | * of last header" is "next header" field in Fragment header. In this case, | |
1443 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
1444 | * isn't NULL. | |
e674d0f3 | 1445 | * |
e674d0f3 | 1446 | */ |
b777e0ce PM |
1447 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
1448 | int target, unsigned short *fragoff) | |
e674d0f3 YK |
1449 | { |
1450 | unsigned int start = (u8*)(skb->nh.ipv6h + 1) - skb->data; | |
1451 | u8 nexthdr = skb->nh.ipv6h->nexthdr; | |
1452 | unsigned int len = skb->len - start; | |
1453 | ||
b777e0ce PM |
1454 | if (fragoff) |
1455 | *fragoff = 0; | |
1456 | ||
e674d0f3 YK |
1457 | while (nexthdr != target) { |
1458 | struct ipv6_opt_hdr _hdr, *hp; | |
1459 | unsigned int hdrlen; | |
1460 | ||
b777e0ce PM |
1461 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
1462 | if (target < 0) | |
1463 | break; | |
e674d0f3 | 1464 | return -1; |
b777e0ce PM |
1465 | } |
1466 | ||
e674d0f3 YK |
1467 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
1468 | if (hp == NULL) | |
1469 | return -1; | |
1470 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
1471 | unsigned short _frag_off, *fp; | |
1472 | fp = skb_header_pointer(skb, | |
1473 | start+offsetof(struct frag_hdr, | |
1474 | frag_off), | |
1475 | sizeof(_frag_off), | |
1476 | &_frag_off); | |
1477 | if (fp == NULL) | |
1478 | return -1; | |
1479 | ||
b777e0ce PM |
1480 | _frag_off = ntohs(*fp) & ~0x7; |
1481 | if (_frag_off) { | |
1482 | if (target < 0 && | |
1483 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
1484 | nexthdr == NEXTHDR_NONE)) { | |
1485 | if (fragoff) | |
1486 | *fragoff = _frag_off; | |
1487 | return hp->nexthdr; | |
1488 | } | |
e674d0f3 | 1489 | return -1; |
b777e0ce | 1490 | } |
e674d0f3 YK |
1491 | hdrlen = 8; |
1492 | } else if (nexthdr == NEXTHDR_AUTH) | |
1493 | hdrlen = (hp->hdrlen + 2) << 2; | |
1494 | else | |
1495 | hdrlen = ipv6_optlen(hp); | |
1496 | ||
1497 | nexthdr = hp->nexthdr; | |
1498 | len -= hdrlen; | |
1499 | start += hdrlen; | |
1500 | } | |
1501 | ||
1502 | *offset = start; | |
b777e0ce | 1503 | return nexthdr; |
e674d0f3 YK |
1504 | } |
1505 | ||
1da177e4 LT |
1506 | EXPORT_SYMBOL(ip6t_register_table); |
1507 | EXPORT_SYMBOL(ip6t_unregister_table); | |
1508 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 1509 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 1510 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 1511 | |
65b4b4e8 AM |
1512 | module_init(ip6_tables_init); |
1513 | module_exit(ip6_tables_fini); |