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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Packet matching code. | |
3 | * | |
4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
6b7d31fc | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
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, |
1da177e4 LT |
223 | const void *targinfo, |
224 | void *userinfo) | |
225 | { | |
226 | if (net_ratelimit()) | |
227 | printk("ip6_tables: error: `%s'\n", (char *)targinfo); | |
228 | ||
229 | return NF_DROP; | |
230 | } | |
231 | ||
232 | static inline | |
233 | int do_match(struct ip6t_entry_match *m, | |
234 | const struct sk_buff *skb, | |
235 | const struct net_device *in, | |
236 | const struct net_device *out, | |
237 | int offset, | |
238 | unsigned int protoff, | |
239 | int *hotdrop) | |
240 | { | |
241 | /* Stop iteration if it doesn't match */ | |
1c524830 | 242 | if (!m->u.kernel.match->match(skb, in, out, m->u.kernel.match, m->data, |
1da177e4 LT |
243 | offset, protoff, hotdrop)) |
244 | return 1; | |
245 | else | |
246 | return 0; | |
247 | } | |
248 | ||
249 | static inline struct ip6t_entry * | |
250 | get_entry(void *base, unsigned int offset) | |
251 | { | |
252 | return (struct ip6t_entry *)(base + offset); | |
253 | } | |
254 | ||
255 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ | |
256 | unsigned int | |
257 | ip6t_do_table(struct sk_buff **pskb, | |
258 | unsigned int hook, | |
259 | const struct net_device *in, | |
260 | const struct net_device *out, | |
2e4e6a17 | 261 | struct xt_table *table, |
1da177e4 LT |
262 | void *userdata) |
263 | { | |
6b7d31fc | 264 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
265 | int offset = 0; |
266 | unsigned int protoff = 0; | |
267 | int hotdrop = 0; | |
268 | /* Initializing verdict to NF_DROP keeps gcc happy. */ | |
269 | unsigned int verdict = NF_DROP; | |
270 | const char *indev, *outdev; | |
271 | void *table_base; | |
272 | struct ip6t_entry *e, *back; | |
2e4e6a17 | 273 | struct xt_table_info *private; |
1da177e4 LT |
274 | |
275 | /* Initialization */ | |
276 | indev = in ? in->name : nulldevname; | |
277 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
278 | /* We handle fragments by dealing with the first fragment as |
279 | * if it was a normal packet. All other fragments are treated | |
280 | * normally, except that they will NEVER match rules that ask | |
281 | * things we don't know, ie. tcp syn flag or ports). If the | |
282 | * rule is also a fragment-specific rule, non-fragments won't | |
283 | * match it. */ | |
284 | ||
285 | read_lock_bh(&table->lock); | |
2e4e6a17 | 286 | private = table->private; |
1da177e4 | 287 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
2e4e6a17 HW |
288 | table_base = (void *)private->entries[smp_processor_id()]; |
289 | e = get_entry(table_base, private->hook_entry[hook]); | |
1da177e4 | 290 | |
1da177e4 | 291 | /* For return from builtin chain */ |
2e4e6a17 | 292 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
293 | |
294 | do { | |
295 | IP_NF_ASSERT(e); | |
296 | IP_NF_ASSERT(back); | |
1da177e4 LT |
297 | if (ip6_packet_match(*pskb, indev, outdev, &e->ipv6, |
298 | &protoff, &offset)) { | |
299 | struct ip6t_entry_target *t; | |
300 | ||
301 | if (IP6T_MATCH_ITERATE(e, do_match, | |
302 | *pskb, in, out, | |
303 | offset, protoff, &hotdrop) != 0) | |
304 | goto no_match; | |
305 | ||
306 | ADD_COUNTER(e->counters, | |
307 | ntohs((*pskb)->nh.ipv6h->payload_len) | |
308 | + IPV6_HDR_LEN, | |
309 | 1); | |
310 | ||
311 | t = ip6t_get_target(e); | |
312 | IP_NF_ASSERT(t->u.kernel.target); | |
313 | /* Standard target? */ | |
314 | if (!t->u.kernel.target->target) { | |
315 | int v; | |
316 | ||
317 | v = ((struct ip6t_standard_target *)t)->verdict; | |
318 | if (v < 0) { | |
319 | /* Pop from stack? */ | |
320 | if (v != IP6T_RETURN) { | |
321 | verdict = (unsigned)(-v) - 1; | |
322 | break; | |
323 | } | |
324 | e = back; | |
325 | back = get_entry(table_base, | |
326 | back->comefrom); | |
327 | continue; | |
328 | } | |
05465343 PM |
329 | if (table_base + v != (void *)e + e->next_offset |
330 | && !(e->ipv6.flags & IP6T_F_GOTO)) { | |
1da177e4 LT |
331 | /* Save old back ptr in next entry */ |
332 | struct ip6t_entry *next | |
333 | = (void *)e + e->next_offset; | |
334 | next->comefrom | |
335 | = (void *)back - table_base; | |
336 | /* set back pointer to next entry */ | |
337 | back = next; | |
338 | } | |
339 | ||
340 | e = get_entry(table_base, v); | |
341 | } else { | |
342 | /* Targets which reenter must return | |
343 | abs. verdicts */ | |
344 | #ifdef CONFIG_NETFILTER_DEBUG | |
345 | ((struct ip6t_entry *)table_base)->comefrom | |
346 | = 0xeeeeeeec; | |
347 | #endif | |
348 | verdict = t->u.kernel.target->target(pskb, | |
349 | in, out, | |
350 | hook, | |
1c524830 | 351 | t->u.kernel.target, |
1da177e4 LT |
352 | t->data, |
353 | userdata); | |
354 | ||
355 | #ifdef CONFIG_NETFILTER_DEBUG | |
356 | if (((struct ip6t_entry *)table_base)->comefrom | |
357 | != 0xeeeeeeec | |
358 | && verdict == IP6T_CONTINUE) { | |
359 | printk("Target %s reentered!\n", | |
360 | t->u.kernel.target->name); | |
361 | verdict = NF_DROP; | |
362 | } | |
363 | ((struct ip6t_entry *)table_base)->comefrom | |
364 | = 0x57acc001; | |
365 | #endif | |
366 | if (verdict == IP6T_CONTINUE) | |
367 | e = (void *)e + e->next_offset; | |
368 | else | |
369 | /* Verdict */ | |
370 | break; | |
371 | } | |
372 | } else { | |
373 | ||
374 | no_match: | |
375 | e = (void *)e + e->next_offset; | |
376 | } | |
377 | } while (!hotdrop); | |
378 | ||
379 | #ifdef CONFIG_NETFILTER_DEBUG | |
4bdbf6c0 | 380 | ((struct ip6t_entry *)table_base)->comefrom = NETFILTER_LINK_POISON; |
1da177e4 LT |
381 | #endif |
382 | read_unlock_bh(&table->lock); | |
383 | ||
384 | #ifdef DEBUG_ALLOW_ALL | |
385 | return NF_ACCEPT; | |
386 | #else | |
387 | if (hotdrop) | |
388 | return NF_DROP; | |
389 | else return verdict; | |
390 | #endif | |
391 | } | |
392 | ||
1da177e4 LT |
393 | /* All zeroes == unconditional rule. */ |
394 | static inline int | |
395 | unconditional(const struct ip6t_ip6 *ipv6) | |
396 | { | |
397 | unsigned int i; | |
398 | ||
399 | for (i = 0; i < sizeof(*ipv6); i++) | |
400 | if (((char *)ipv6)[i]) | |
401 | break; | |
402 | ||
403 | return (i == sizeof(*ipv6)); | |
404 | } | |
405 | ||
406 | /* Figures out from what hook each rule can be called: returns 0 if | |
407 | there are loops. Puts hook bitmask in comefrom. */ | |
408 | static int | |
2e4e6a17 | 409 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 410 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
411 | { |
412 | unsigned int hook; | |
413 | ||
414 | /* No recursion; use packet counter to save back ptrs (reset | |
415 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
416 | for (hook = 0; hook < NF_IP6_NUMHOOKS; hook++) { | |
417 | unsigned int pos = newinfo->hook_entry[hook]; | |
418 | struct ip6t_entry *e | |
31836064 | 419 | = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
420 | |
421 | if (!(valid_hooks & (1 << hook))) | |
422 | continue; | |
423 | ||
424 | /* Set initial back pointer. */ | |
425 | e->counters.pcnt = pos; | |
426 | ||
427 | for (;;) { | |
428 | struct ip6t_standard_target *t | |
429 | = (void *)ip6t_get_target(e); | |
430 | ||
431 | if (e->comefrom & (1 << NF_IP6_NUMHOOKS)) { | |
432 | printk("iptables: loop hook %u pos %u %08X.\n", | |
433 | hook, pos, e->comefrom); | |
434 | return 0; | |
435 | } | |
436 | e->comefrom | |
437 | |= ((1 << hook) | (1 << NF_IP6_NUMHOOKS)); | |
438 | ||
439 | /* Unconditional return/END. */ | |
440 | if (e->target_offset == sizeof(struct ip6t_entry) | |
441 | && (strcmp(t->target.u.user.name, | |
442 | IP6T_STANDARD_TARGET) == 0) | |
443 | && t->verdict < 0 | |
444 | && unconditional(&e->ipv6)) { | |
445 | unsigned int oldpos, size; | |
446 | ||
447 | /* Return: backtrack through the last | |
448 | big jump. */ | |
449 | do { | |
450 | e->comefrom ^= (1<<NF_IP6_NUMHOOKS); | |
451 | #ifdef DEBUG_IP_FIREWALL_USER | |
452 | if (e->comefrom | |
453 | & (1 << NF_IP6_NUMHOOKS)) { | |
454 | duprintf("Back unset " | |
455 | "on hook %u " | |
456 | "rule %u\n", | |
457 | hook, pos); | |
458 | } | |
459 | #endif | |
460 | oldpos = pos; | |
461 | pos = e->counters.pcnt; | |
462 | e->counters.pcnt = 0; | |
463 | ||
464 | /* We're at the start. */ | |
465 | if (pos == oldpos) | |
466 | goto next; | |
467 | ||
468 | e = (struct ip6t_entry *) | |
31836064 | 469 | (entry0 + pos); |
1da177e4 LT |
470 | } while (oldpos == pos + e->next_offset); |
471 | ||
472 | /* Move along one */ | |
473 | size = e->next_offset; | |
474 | e = (struct ip6t_entry *) | |
31836064 | 475 | (entry0 + pos + size); |
1da177e4 LT |
476 | e->counters.pcnt = pos; |
477 | pos += size; | |
478 | } else { | |
479 | int newpos = t->verdict; | |
480 | ||
481 | if (strcmp(t->target.u.user.name, | |
482 | IP6T_STANDARD_TARGET) == 0 | |
483 | && newpos >= 0) { | |
484 | /* This a jump; chase it. */ | |
485 | duprintf("Jump rule %u -> %u\n", | |
486 | pos, newpos); | |
487 | } else { | |
488 | /* ... this is a fallthru */ | |
489 | newpos = pos + e->next_offset; | |
490 | } | |
491 | e = (struct ip6t_entry *) | |
31836064 | 492 | (entry0 + newpos); |
1da177e4 LT |
493 | e->counters.pcnt = pos; |
494 | pos = newpos; | |
495 | } | |
496 | } | |
497 | next: | |
498 | duprintf("Finished chain %u\n", hook); | |
499 | } | |
500 | return 1; | |
501 | } | |
502 | ||
503 | static inline int | |
504 | cleanup_match(struct ip6t_entry_match *m, unsigned int *i) | |
505 | { | |
506 | if (i && (*i)-- == 0) | |
507 | return 1; | |
508 | ||
509 | if (m->u.kernel.match->destroy) | |
1c524830 | 510 | m->u.kernel.match->destroy(m->u.kernel.match, m->data, |
1da177e4 LT |
511 | m->u.match_size - sizeof(*m)); |
512 | module_put(m->u.kernel.match->me); | |
513 | return 0; | |
514 | } | |
515 | ||
516 | static inline int | |
517 | standard_check(const struct ip6t_entry_target *t, | |
518 | unsigned int max_offset) | |
519 | { | |
520 | struct ip6t_standard_target *targ = (void *)t; | |
521 | ||
522 | /* Check standard info. */ | |
1da177e4 LT |
523 | if (targ->verdict >= 0 |
524 | && targ->verdict > max_offset - sizeof(struct ip6t_entry)) { | |
525 | duprintf("ip6t_standard_check: bad verdict (%i)\n", | |
526 | targ->verdict); | |
527 | return 0; | |
528 | } | |
1da177e4 LT |
529 | if (targ->verdict < -NF_MAX_VERDICT - 1) { |
530 | duprintf("ip6t_standard_check: bad negative verdict (%i)\n", | |
531 | targ->verdict); | |
532 | return 0; | |
533 | } | |
534 | return 1; | |
535 | } | |
536 | ||
537 | static inline int | |
538 | check_match(struct ip6t_entry_match *m, | |
539 | const char *name, | |
540 | const struct ip6t_ip6 *ipv6, | |
541 | unsigned int hookmask, | |
542 | unsigned int *i) | |
543 | { | |
1da177e4 | 544 | struct ip6t_match *match; |
3cdc7c95 | 545 | int ret; |
1da177e4 | 546 | |
2e4e6a17 HW |
547 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, |
548 | m->u.user.revision), | |
6b7d31fc HW |
549 | "ip6t_%s", m->u.user.name); |
550 | if (IS_ERR(match) || !match) { | |
2e4e6a17 | 551 | duprintf("check_match: `%s' not found\n", m->u.user.name); |
6b7d31fc | 552 | return match ? PTR_ERR(match) : -ENOENT; |
1da177e4 LT |
553 | } |
554 | m->u.kernel.match = match; | |
1da177e4 | 555 | |
3cdc7c95 PM |
556 | ret = xt_check_match(match, AF_INET6, m->u.match_size - sizeof(*m), |
557 | name, hookmask, ipv6->proto, | |
558 | ipv6->invflags & IP6T_INV_PROTO); | |
559 | if (ret) | |
560 | goto err; | |
561 | ||
1da177e4 | 562 | if (m->u.kernel.match->checkentry |
1c524830 | 563 | && !m->u.kernel.match->checkentry(name, ipv6, match, m->data, |
1da177e4 LT |
564 | m->u.match_size - sizeof(*m), |
565 | hookmask)) { | |
1da177e4 LT |
566 | duprintf("ip_tables: check failed for `%s'.\n", |
567 | m->u.kernel.match->name); | |
3cdc7c95 PM |
568 | ret = -EINVAL; |
569 | goto err; | |
1da177e4 LT |
570 | } |
571 | ||
572 | (*i)++; | |
573 | return 0; | |
3cdc7c95 PM |
574 | err: |
575 | module_put(m->u.kernel.match->me); | |
576 | return ret; | |
1da177e4 LT |
577 | } |
578 | ||
579 | static struct ip6t_target ip6t_standard_target; | |
580 | ||
581 | static inline int | |
582 | check_entry(struct ip6t_entry *e, const char *name, unsigned int size, | |
583 | unsigned int *i) | |
584 | { | |
585 | struct ip6t_entry_target *t; | |
586 | struct ip6t_target *target; | |
587 | int ret; | |
588 | unsigned int j; | |
589 | ||
590 | if (!ip6_checkentry(&e->ipv6)) { | |
591 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
592 | return -EINVAL; | |
593 | } | |
594 | ||
595 | j = 0; | |
596 | ret = IP6T_MATCH_ITERATE(e, check_match, name, &e->ipv6, e->comefrom, &j); | |
597 | if (ret != 0) | |
598 | goto cleanup_matches; | |
599 | ||
600 | t = ip6t_get_target(e); | |
2e4e6a17 HW |
601 | target = try_then_request_module(xt_find_target(AF_INET6, |
602 | t->u.user.name, | |
603 | t->u.user.revision), | |
6b7d31fc HW |
604 | "ip6t_%s", t->u.user.name); |
605 | if (IS_ERR(target) || !target) { | |
1da177e4 | 606 | duprintf("check_entry: `%s' not found\n", t->u.user.name); |
6b7d31fc | 607 | ret = target ? PTR_ERR(target) : -ENOENT; |
1da177e4 LT |
608 | goto cleanup_matches; |
609 | } | |
610 | t->u.kernel.target = target; | |
6b7d31fc | 611 | |
3cdc7c95 PM |
612 | ret = xt_check_target(target, AF_INET6, t->u.target_size - sizeof(*t), |
613 | name, e->comefrom, e->ipv6.proto, | |
614 | e->ipv6.invflags & IP6T_INV_PROTO); | |
615 | if (ret) | |
616 | goto err; | |
617 | ||
1da177e4 LT |
618 | if (t->u.kernel.target == &ip6t_standard_target) { |
619 | if (!standard_check(t, size)) { | |
620 | ret = -EINVAL; | |
621 | goto cleanup_matches; | |
622 | } | |
623 | } else if (t->u.kernel.target->checkentry | |
1c524830 | 624 | && !t->u.kernel.target->checkentry(name, e, target, t->data, |
1da177e4 LT |
625 | t->u.target_size |
626 | - sizeof(*t), | |
627 | e->comefrom)) { | |
1da177e4 LT |
628 | duprintf("ip_tables: check failed for `%s'.\n", |
629 | t->u.kernel.target->name); | |
630 | ret = -EINVAL; | |
3cdc7c95 | 631 | goto err; |
1da177e4 LT |
632 | } |
633 | ||
634 | (*i)++; | |
635 | return 0; | |
3cdc7c95 PM |
636 | err: |
637 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
638 | cleanup_matches: |
639 | IP6T_MATCH_ITERATE(e, cleanup_match, &j); | |
640 | return ret; | |
641 | } | |
642 | ||
643 | static inline int | |
644 | check_entry_size_and_hooks(struct ip6t_entry *e, | |
2e4e6a17 | 645 | struct xt_table_info *newinfo, |
1da177e4 LT |
646 | unsigned char *base, |
647 | unsigned char *limit, | |
648 | const unsigned int *hook_entries, | |
649 | const unsigned int *underflows, | |
650 | unsigned int *i) | |
651 | { | |
652 | unsigned int h; | |
653 | ||
654 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 | |
655 | || (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
656 | duprintf("Bad offset %p\n", e); | |
657 | return -EINVAL; | |
658 | } | |
659 | ||
660 | if (e->next_offset | |
661 | < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) { | |
662 | duprintf("checking: element %p size %u\n", | |
663 | e, e->next_offset); | |
664 | return -EINVAL; | |
665 | } | |
666 | ||
667 | /* Check hooks & underflows */ | |
668 | for (h = 0; h < NF_IP6_NUMHOOKS; h++) { | |
669 | if ((unsigned char *)e - base == hook_entries[h]) | |
670 | newinfo->hook_entry[h] = hook_entries[h]; | |
671 | if ((unsigned char *)e - base == underflows[h]) | |
672 | newinfo->underflow[h] = underflows[h]; | |
673 | } | |
674 | ||
675 | /* FIXME: underflows must be unconditional, standard verdicts | |
676 | < 0 (not IP6T_RETURN). --RR */ | |
677 | ||
678 | /* Clear counters and comefrom */ | |
2e4e6a17 | 679 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
680 | e->comefrom = 0; |
681 | ||
682 | (*i)++; | |
683 | return 0; | |
684 | } | |
685 | ||
686 | static inline int | |
687 | cleanup_entry(struct ip6t_entry *e, unsigned int *i) | |
688 | { | |
689 | struct ip6t_entry_target *t; | |
690 | ||
691 | if (i && (*i)-- == 0) | |
692 | return 1; | |
693 | ||
694 | /* Cleanup all matches */ | |
695 | IP6T_MATCH_ITERATE(e, cleanup_match, NULL); | |
696 | t = ip6t_get_target(e); | |
697 | if (t->u.kernel.target->destroy) | |
1c524830 | 698 | t->u.kernel.target->destroy(t->u.kernel.target, t->data, |
1da177e4 LT |
699 | t->u.target_size - sizeof(*t)); |
700 | module_put(t->u.kernel.target->me); | |
701 | return 0; | |
702 | } | |
703 | ||
704 | /* Checks and translates the user-supplied table segment (held in | |
705 | newinfo) */ | |
706 | static int | |
707 | translate_table(const char *name, | |
708 | unsigned int valid_hooks, | |
2e4e6a17 | 709 | struct xt_table_info *newinfo, |
31836064 | 710 | void *entry0, |
1da177e4 LT |
711 | unsigned int size, |
712 | unsigned int number, | |
713 | const unsigned int *hook_entries, | |
714 | const unsigned int *underflows) | |
715 | { | |
716 | unsigned int i; | |
717 | int ret; | |
718 | ||
719 | newinfo->size = size; | |
720 | newinfo->number = number; | |
721 | ||
722 | /* Init all hooks to impossible value. */ | |
723 | for (i = 0; i < NF_IP6_NUMHOOKS; i++) { | |
724 | newinfo->hook_entry[i] = 0xFFFFFFFF; | |
725 | newinfo->underflow[i] = 0xFFFFFFFF; | |
726 | } | |
727 | ||
728 | duprintf("translate_table: size %u\n", newinfo->size); | |
729 | i = 0; | |
730 | /* Walk through entries, checking offsets. */ | |
31836064 | 731 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
732 | check_entry_size_and_hooks, |
733 | newinfo, | |
31836064 ED |
734 | entry0, |
735 | entry0 + size, | |
1da177e4 LT |
736 | hook_entries, underflows, &i); |
737 | if (ret != 0) | |
738 | return ret; | |
739 | ||
740 | if (i != number) { | |
741 | duprintf("translate_table: %u not %u entries\n", | |
742 | i, number); | |
743 | return -EINVAL; | |
744 | } | |
745 | ||
746 | /* Check hooks all assigned */ | |
747 | for (i = 0; i < NF_IP6_NUMHOOKS; i++) { | |
748 | /* Only hooks which are valid */ | |
749 | if (!(valid_hooks & (1 << i))) | |
750 | continue; | |
751 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
752 | duprintf("Invalid hook entry %u %u\n", | |
753 | i, hook_entries[i]); | |
754 | return -EINVAL; | |
755 | } | |
756 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
757 | duprintf("Invalid underflow %u %u\n", | |
758 | i, underflows[i]); | |
759 | return -EINVAL; | |
760 | } | |
761 | } | |
762 | ||
31836064 | 763 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
1da177e4 LT |
764 | return -ELOOP; |
765 | ||
766 | /* Finally, each sanity check must pass */ | |
767 | i = 0; | |
31836064 | 768 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
769 | check_entry, name, size, &i); |
770 | ||
771 | if (ret != 0) { | |
31836064 | 772 | IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
773 | cleanup_entry, &i); |
774 | return ret; | |
775 | } | |
776 | ||
777 | /* And one copy for every other CPU */ | |
6f912042 | 778 | for_each_possible_cpu(i) { |
31836064 ED |
779 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
780 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
781 | } |
782 | ||
783 | return ret; | |
784 | } | |
785 | ||
1da177e4 LT |
786 | /* Gets counters. */ |
787 | static inline int | |
788 | add_entry_to_counter(const struct ip6t_entry *e, | |
2e4e6a17 | 789 | struct xt_counters total[], |
1da177e4 LT |
790 | unsigned int *i) |
791 | { | |
792 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
793 | ||
794 | (*i)++; | |
795 | return 0; | |
796 | } | |
797 | ||
31836064 ED |
798 | static inline int |
799 | set_entry_to_counter(const struct ip6t_entry *e, | |
800 | struct ip6t_counters total[], | |
801 | unsigned int *i) | |
802 | { | |
803 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
804 | ||
805 | (*i)++; | |
806 | return 0; | |
807 | } | |
808 | ||
1da177e4 | 809 | static void |
2e4e6a17 HW |
810 | get_counters(const struct xt_table_info *t, |
811 | struct xt_counters counters[]) | |
1da177e4 LT |
812 | { |
813 | unsigned int cpu; | |
814 | unsigned int i; | |
31836064 ED |
815 | unsigned int curcpu; |
816 | ||
817 | /* Instead of clearing (by a previous call to memset()) | |
818 | * the counters and using adds, we set the counters | |
819 | * with data used by 'current' CPU | |
820 | * We dont care about preemption here. | |
821 | */ | |
822 | curcpu = raw_smp_processor_id(); | |
823 | ||
824 | i = 0; | |
825 | IP6T_ENTRY_ITERATE(t->entries[curcpu], | |
826 | t->size, | |
827 | set_entry_to_counter, | |
828 | counters, | |
829 | &i); | |
1da177e4 | 830 | |
6f912042 | 831 | for_each_possible_cpu(cpu) { |
31836064 ED |
832 | if (cpu == curcpu) |
833 | continue; | |
1da177e4 | 834 | i = 0; |
31836064 | 835 | IP6T_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
836 | t->size, |
837 | add_entry_to_counter, | |
838 | counters, | |
839 | &i); | |
840 | } | |
841 | } | |
842 | ||
843 | static int | |
844 | copy_entries_to_user(unsigned int total_size, | |
2e4e6a17 | 845 | struct xt_table *table, |
1da177e4 LT |
846 | void __user *userptr) |
847 | { | |
848 | unsigned int off, num, countersize; | |
849 | struct ip6t_entry *e; | |
2e4e6a17 HW |
850 | struct xt_counters *counters; |
851 | struct xt_table_info *private = table->private; | |
1da177e4 | 852 | int ret = 0; |
31836064 | 853 | void *loc_cpu_entry; |
1da177e4 LT |
854 | |
855 | /* We need atomic snapshot of counters: rest doesn't change | |
856 | (other than comefrom, which userspace doesn't care | |
857 | about). */ | |
2e4e6a17 | 858 | countersize = sizeof(struct xt_counters) * private->number; |
1da177e4 LT |
859 | counters = vmalloc(countersize); |
860 | ||
861 | if (counters == NULL) | |
862 | return -ENOMEM; | |
863 | ||
864 | /* First, sum counters... */ | |
1da177e4 | 865 | write_lock_bh(&table->lock); |
2e4e6a17 | 866 | get_counters(private, counters); |
1da177e4 LT |
867 | write_unlock_bh(&table->lock); |
868 | ||
31836064 | 869 | /* choose the copy that is on ourc node/cpu */ |
2e4e6a17 | 870 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 871 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
872 | ret = -EFAULT; |
873 | goto free_counters; | |
874 | } | |
875 | ||
876 | /* FIXME: use iterator macros --RR */ | |
877 | /* ... then go back and fix counters and names */ | |
878 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
879 | unsigned int i; | |
880 | struct ip6t_entry_match *m; | |
881 | struct ip6t_entry_target *t; | |
882 | ||
31836064 | 883 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
884 | if (copy_to_user(userptr + off |
885 | + offsetof(struct ip6t_entry, counters), | |
886 | &counters[num], | |
887 | sizeof(counters[num])) != 0) { | |
888 | ret = -EFAULT; | |
889 | goto free_counters; | |
890 | } | |
891 | ||
892 | for (i = sizeof(struct ip6t_entry); | |
893 | i < e->target_offset; | |
894 | i += m->u.match_size) { | |
895 | m = (void *)e + i; | |
896 | ||
897 | if (copy_to_user(userptr + off + i | |
898 | + offsetof(struct ip6t_entry_match, | |
899 | u.user.name), | |
900 | m->u.kernel.match->name, | |
901 | strlen(m->u.kernel.match->name)+1) | |
902 | != 0) { | |
903 | ret = -EFAULT; | |
904 | goto free_counters; | |
905 | } | |
906 | } | |
907 | ||
908 | t = ip6t_get_target(e); | |
909 | if (copy_to_user(userptr + off + e->target_offset | |
910 | + offsetof(struct ip6t_entry_target, | |
911 | u.user.name), | |
912 | t->u.kernel.target->name, | |
913 | strlen(t->u.kernel.target->name)+1) != 0) { | |
914 | ret = -EFAULT; | |
915 | goto free_counters; | |
916 | } | |
917 | } | |
918 | ||
919 | free_counters: | |
920 | vfree(counters); | |
921 | return ret; | |
922 | } | |
923 | ||
924 | static int | |
925 | get_entries(const struct ip6t_get_entries *entries, | |
926 | struct ip6t_get_entries __user *uptr) | |
927 | { | |
928 | int ret; | |
2e4e6a17 | 929 | struct xt_table *t; |
1da177e4 | 930 | |
2e4e6a17 | 931 | t = xt_find_table_lock(AF_INET6, entries->name); |
6b7d31fc | 932 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
933 | struct xt_table_info *private = t->private; |
934 | duprintf("t->private->number = %u\n", private->number); | |
935 | if (entries->size == private->size) | |
936 | ret = copy_entries_to_user(private->size, | |
1da177e4 LT |
937 | t, uptr->entrytable); |
938 | else { | |
939 | duprintf("get_entries: I've got %u not %u!\n", | |
2e4e6a17 | 940 | private->size, entries->size); |
1da177e4 LT |
941 | ret = -EINVAL; |
942 | } | |
6b7d31fc | 943 | module_put(t->me); |
2e4e6a17 | 944 | xt_table_unlock(t); |
1da177e4 | 945 | } else |
6b7d31fc | 946 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
947 | |
948 | return ret; | |
949 | } | |
950 | ||
951 | static int | |
952 | do_replace(void __user *user, unsigned int len) | |
953 | { | |
954 | int ret; | |
955 | struct ip6t_replace tmp; | |
2e4e6a17 HW |
956 | struct xt_table *t; |
957 | struct xt_table_info *newinfo, *oldinfo; | |
958 | struct xt_counters *counters; | |
31836064 | 959 | void *loc_cpu_entry, *loc_cpu_old_entry; |
1da177e4 LT |
960 | |
961 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
962 | return -EFAULT; | |
963 | ||
ee4bb818 KK |
964 | /* overflow check */ |
965 | if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS - | |
966 | SMP_CACHE_BYTES) | |
967 | return -ENOMEM; | |
968 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
969 | return -ENOMEM; | |
970 | ||
2e4e6a17 | 971 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
972 | if (!newinfo) |
973 | return -ENOMEM; | |
974 | ||
31836064 ED |
975 | /* choose the copy that is on our node/cpu */ |
976 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
977 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
978 | tmp.size) != 0) { |
979 | ret = -EFAULT; | |
980 | goto free_newinfo; | |
981 | } | |
982 | ||
2e4e6a17 | 983 | counters = vmalloc(tmp.num_counters * sizeof(struct xt_counters)); |
1da177e4 LT |
984 | if (!counters) { |
985 | ret = -ENOMEM; | |
986 | goto free_newinfo; | |
987 | } | |
1da177e4 LT |
988 | |
989 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
31836064 | 990 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, |
1da177e4 LT |
991 | tmp.hook_entry, tmp.underflow); |
992 | if (ret != 0) | |
993 | goto free_newinfo_counters; | |
994 | ||
995 | duprintf("ip_tables: Translated table\n"); | |
996 | ||
2e4e6a17 | 997 | t = try_then_request_module(xt_find_table_lock(AF_INET6, tmp.name), |
6b7d31fc HW |
998 | "ip6table_%s", tmp.name); |
999 | if (!t || IS_ERR(t)) { | |
1000 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1001 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1002 | } |
1da177e4 LT |
1003 | |
1004 | /* You lied! */ | |
1005 | if (tmp.valid_hooks != t->valid_hooks) { | |
1006 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1007 | tmp.valid_hooks, t->valid_hooks); | |
1008 | ret = -EINVAL; | |
6b7d31fc | 1009 | goto put_module; |
1da177e4 LT |
1010 | } |
1011 | ||
2e4e6a17 | 1012 | oldinfo = xt_replace_table(t, tmp.num_counters, newinfo, &ret); |
1da177e4 LT |
1013 | if (!oldinfo) |
1014 | goto put_module; | |
1015 | ||
1016 | /* Update module usage count based on number of rules */ | |
1017 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1018 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1019 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1020 | (newinfo->number <= oldinfo->initial_entries)) | |
1021 | module_put(t->me); | |
1022 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1023 | (newinfo->number <= oldinfo->initial_entries)) | |
1024 | module_put(t->me); | |
1025 | ||
1026 | /* Get the old counters. */ | |
1027 | get_counters(oldinfo, counters); | |
1028 | /* Decrease module usage counts and free resource */ | |
31836064 ED |
1029 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
1030 | IP6T_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL); | |
2e4e6a17 | 1031 | xt_free_table_info(oldinfo); |
1da177e4 | 1032 | if (copy_to_user(tmp.counters, counters, |
2e4e6a17 | 1033 | sizeof(struct xt_counters) * tmp.num_counters) != 0) |
1da177e4 LT |
1034 | ret = -EFAULT; |
1035 | vfree(counters); | |
2e4e6a17 | 1036 | xt_table_unlock(t); |
1da177e4 LT |
1037 | return ret; |
1038 | ||
1039 | put_module: | |
1040 | module_put(t->me); | |
2e4e6a17 | 1041 | xt_table_unlock(t); |
1da177e4 | 1042 | free_newinfo_counters_untrans: |
31836064 | 1043 | IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL); |
1da177e4 LT |
1044 | free_newinfo_counters: |
1045 | vfree(counters); | |
1046 | free_newinfo: | |
2e4e6a17 | 1047 | xt_free_table_info(newinfo); |
1da177e4 LT |
1048 | return ret; |
1049 | } | |
1050 | ||
1051 | /* We're lazy, and add to the first CPU; overflow works its fey magic | |
1052 | * and everything is OK. */ | |
1053 | static inline int | |
1054 | add_counter_to_entry(struct ip6t_entry *e, | |
2e4e6a17 | 1055 | const struct xt_counters addme[], |
1da177e4 LT |
1056 | unsigned int *i) |
1057 | { | |
1058 | #if 0 | |
1059 | duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n", | |
1060 | *i, | |
1061 | (long unsigned int)e->counters.pcnt, | |
1062 | (long unsigned int)e->counters.bcnt, | |
1063 | (long unsigned int)addme[*i].pcnt, | |
1064 | (long unsigned int)addme[*i].bcnt); | |
1065 | #endif | |
1066 | ||
1067 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1068 | ||
1069 | (*i)++; | |
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | static int | |
1074 | do_add_counters(void __user *user, unsigned int len) | |
1075 | { | |
1076 | unsigned int i; | |
2e4e6a17 HW |
1077 | struct xt_counters_info tmp, *paddc; |
1078 | struct xt_table_info *private; | |
1079 | struct xt_table *t; | |
6b7d31fc | 1080 | int ret = 0; |
31836064 | 1081 | void *loc_cpu_entry; |
1da177e4 LT |
1082 | |
1083 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1084 | return -EFAULT; | |
1085 | ||
2e4e6a17 | 1086 | if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct xt_counters)) |
1da177e4 LT |
1087 | return -EINVAL; |
1088 | ||
1089 | paddc = vmalloc(len); | |
1090 | if (!paddc) | |
1091 | return -ENOMEM; | |
1092 | ||
1093 | if (copy_from_user(paddc, user, len) != 0) { | |
1094 | ret = -EFAULT; | |
1095 | goto free; | |
1096 | } | |
1097 | ||
2e4e6a17 | 1098 | t = xt_find_table_lock(AF_INET6, tmp.name); |
6b7d31fc HW |
1099 | if (!t || IS_ERR(t)) { |
1100 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1101 | goto free; |
6b7d31fc | 1102 | } |
1da177e4 LT |
1103 | |
1104 | write_lock_bh(&t->lock); | |
2e4e6a17 | 1105 | private = t->private; |
2c8ac66b | 1106 | if (private->number != tmp.num_counters) { |
1da177e4 LT |
1107 | ret = -EINVAL; |
1108 | goto unlock_up_free; | |
1109 | } | |
1110 | ||
1111 | i = 0; | |
31836064 | 1112 | /* Choose the copy that is on our node */ |
2e4e6a17 | 1113 | loc_cpu_entry = private->entries[smp_processor_id()]; |
31836064 | 1114 | IP6T_ENTRY_ITERATE(loc_cpu_entry, |
2e4e6a17 | 1115 | private->size, |
1da177e4 LT |
1116 | add_counter_to_entry, |
1117 | paddc->counters, | |
1118 | &i); | |
1119 | unlock_up_free: | |
1120 | write_unlock_bh(&t->lock); | |
2e4e6a17 | 1121 | xt_table_unlock(t); |
6b7d31fc | 1122 | module_put(t->me); |
1da177e4 LT |
1123 | free: |
1124 | vfree(paddc); | |
1125 | ||
1126 | return ret; | |
1127 | } | |
1128 | ||
1129 | static int | |
1130 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
1131 | { | |
1132 | int ret; | |
1133 | ||
1134 | if (!capable(CAP_NET_ADMIN)) | |
1135 | return -EPERM; | |
1136 | ||
1137 | switch (cmd) { | |
1138 | case IP6T_SO_SET_REPLACE: | |
1139 | ret = do_replace(user, len); | |
1140 | break; | |
1141 | ||
1142 | case IP6T_SO_SET_ADD_COUNTERS: | |
1143 | ret = do_add_counters(user, len); | |
1144 | break; | |
1145 | ||
1146 | default: | |
1147 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1148 | ret = -EINVAL; | |
1149 | } | |
1150 | ||
1151 | return ret; | |
1152 | } | |
1153 | ||
1154 | static int | |
1155 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1156 | { | |
1157 | int ret; | |
1158 | ||
1159 | if (!capable(CAP_NET_ADMIN)) | |
1160 | return -EPERM; | |
1161 | ||
1162 | switch (cmd) { | |
1163 | case IP6T_SO_GET_INFO: { | |
1164 | char name[IP6T_TABLE_MAXNAMELEN]; | |
2e4e6a17 | 1165 | struct xt_table *t; |
1da177e4 LT |
1166 | |
1167 | if (*len != sizeof(struct ip6t_getinfo)) { | |
1168 | duprintf("length %u != %u\n", *len, | |
1169 | sizeof(struct ip6t_getinfo)); | |
1170 | ret = -EINVAL; | |
1171 | break; | |
1172 | } | |
1173 | ||
1174 | if (copy_from_user(name, user, sizeof(name)) != 0) { | |
1175 | ret = -EFAULT; | |
1176 | break; | |
1177 | } | |
1178 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; | |
6b7d31fc | 1179 | |
2e4e6a17 | 1180 | t = try_then_request_module(xt_find_table_lock(AF_INET6, name), |
6b7d31fc HW |
1181 | "ip6table_%s", name); |
1182 | if (t && !IS_ERR(t)) { | |
1da177e4 | 1183 | struct ip6t_getinfo info; |
2e4e6a17 | 1184 | struct xt_table_info *private = t->private; |
1da177e4 LT |
1185 | |
1186 | info.valid_hooks = t->valid_hooks; | |
2e4e6a17 | 1187 | memcpy(info.hook_entry, private->hook_entry, |
1da177e4 | 1188 | sizeof(info.hook_entry)); |
2e4e6a17 | 1189 | memcpy(info.underflow, private->underflow, |
1da177e4 | 1190 | sizeof(info.underflow)); |
2e4e6a17 HW |
1191 | info.num_entries = private->number; |
1192 | info.size = private->size; | |
1da177e4 LT |
1193 | memcpy(info.name, name, sizeof(info.name)); |
1194 | ||
1195 | if (copy_to_user(user, &info, *len) != 0) | |
1196 | ret = -EFAULT; | |
1197 | else | |
1198 | ret = 0; | |
2e4e6a17 | 1199 | xt_table_unlock(t); |
6b7d31fc HW |
1200 | module_put(t->me); |
1201 | } else | |
1202 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 LT |
1203 | } |
1204 | break; | |
1205 | ||
1206 | case IP6T_SO_GET_ENTRIES: { | |
1207 | struct ip6t_get_entries get; | |
1208 | ||
1209 | if (*len < sizeof(get)) { | |
1210 | duprintf("get_entries: %u < %u\n", *len, sizeof(get)); | |
1211 | ret = -EINVAL; | |
1212 | } else if (copy_from_user(&get, user, sizeof(get)) != 0) { | |
1213 | ret = -EFAULT; | |
1214 | } else if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
1215 | duprintf("get_entries: %u != %u\n", *len, | |
1216 | sizeof(struct ip6t_get_entries) + get.size); | |
1217 | ret = -EINVAL; | |
1218 | } else | |
1219 | ret = get_entries(&get, user); | |
1220 | break; | |
1221 | } | |
1222 | ||
6b7d31fc HW |
1223 | case IP6T_SO_GET_REVISION_MATCH: |
1224 | case IP6T_SO_GET_REVISION_TARGET: { | |
1225 | struct ip6t_get_revision rev; | |
2e4e6a17 | 1226 | int target; |
6b7d31fc HW |
1227 | |
1228 | if (*len != sizeof(rev)) { | |
1229 | ret = -EINVAL; | |
1230 | break; | |
1231 | } | |
1232 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1233 | ret = -EFAULT; | |
1234 | break; | |
1235 | } | |
1236 | ||
1237 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 1238 | target = 1; |
6b7d31fc | 1239 | else |
2e4e6a17 | 1240 | target = 0; |
6b7d31fc | 1241 | |
2e4e6a17 HW |
1242 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
1243 | rev.revision, | |
1244 | target, &ret), | |
6b7d31fc HW |
1245 | "ip6t_%s", rev.name); |
1246 | break; | |
1247 | } | |
1248 | ||
1da177e4 LT |
1249 | default: |
1250 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
1251 | ret = -EINVAL; | |
1252 | } | |
1253 | ||
1254 | return ret; | |
1255 | } | |
1256 | ||
2e4e6a17 | 1257 | int ip6t_register_table(struct xt_table *table, |
1da177e4 LT |
1258 | const struct ip6t_replace *repl) |
1259 | { | |
1260 | int ret; | |
2e4e6a17 HW |
1261 | struct xt_table_info *newinfo; |
1262 | static struct xt_table_info bootstrap | |
1da177e4 | 1263 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 1264 | void *loc_cpu_entry; |
1da177e4 | 1265 | |
2e4e6a17 | 1266 | newinfo = xt_alloc_table_info(repl->size); |
1da177e4 LT |
1267 | if (!newinfo) |
1268 | return -ENOMEM; | |
1269 | ||
31836064 ED |
1270 | /* choose the copy on our node/cpu */ |
1271 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1272 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
1273 | |
1274 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 1275 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
1276 | repl->num_entries, |
1277 | repl->hook_entry, | |
1278 | repl->underflow); | |
1279 | if (ret != 0) { | |
2e4e6a17 | 1280 | xt_free_table_info(newinfo); |
1da177e4 LT |
1281 | return ret; |
1282 | } | |
1283 | ||
da298d3a PM |
1284 | ret = xt_register_table(table, &bootstrap, newinfo); |
1285 | if (ret != 0) { | |
2e4e6a17 | 1286 | xt_free_table_info(newinfo); |
1da177e4 LT |
1287 | return ret; |
1288 | } | |
1289 | ||
2e4e6a17 | 1290 | return 0; |
1da177e4 LT |
1291 | } |
1292 | ||
2e4e6a17 | 1293 | void ip6t_unregister_table(struct xt_table *table) |
1da177e4 | 1294 | { |
2e4e6a17 | 1295 | struct xt_table_info *private; |
31836064 ED |
1296 | void *loc_cpu_entry; |
1297 | ||
2e4e6a17 | 1298 | private = xt_unregister_table(table); |
1da177e4 LT |
1299 | |
1300 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
1301 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
1302 | IP6T_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
1303 | xt_free_table_info(private); | |
1da177e4 LT |
1304 | } |
1305 | ||
1306 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1307 | static inline int | |
1308 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, | |
1309 | u_int8_t type, u_int8_t code, | |
1310 | int invert) | |
1311 | { | |
1312 | return (type == test_type && code >= min_code && code <= max_code) | |
1313 | ^ invert; | |
1314 | } | |
1315 | ||
1316 | static int | |
1317 | icmp6_match(const struct sk_buff *skb, | |
1318 | const struct net_device *in, | |
1319 | const struct net_device *out, | |
c4986734 | 1320 | const struct xt_match *match, |
1da177e4 LT |
1321 | const void *matchinfo, |
1322 | int offset, | |
1323 | unsigned int protoff, | |
1324 | int *hotdrop) | |
1325 | { | |
1326 | struct icmp6hdr _icmp, *ic; | |
1327 | const struct ip6t_icmp *icmpinfo = matchinfo; | |
1328 | ||
1329 | /* Must not be a fragment. */ | |
1330 | if (offset) | |
1331 | return 0; | |
1332 | ||
1333 | ic = skb_header_pointer(skb, protoff, sizeof(_icmp), &_icmp); | |
1334 | if (ic == NULL) { | |
1335 | /* We've been asked to examine this packet, and we | |
1336 | can't. Hence, no choice but to drop. */ | |
1337 | duprintf("Dropping evil ICMP tinygram.\n"); | |
1338 | *hotdrop = 1; | |
1339 | return 0; | |
1340 | } | |
1341 | ||
1342 | return icmp6_type_code_match(icmpinfo->type, | |
1343 | icmpinfo->code[0], | |
1344 | icmpinfo->code[1], | |
1345 | ic->icmp6_type, ic->icmp6_code, | |
1346 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
1347 | } | |
1348 | ||
1349 | /* Called when user tries to insert an entry of this type. */ | |
1350 | static int | |
1351 | icmp6_checkentry(const char *tablename, | |
2e4e6a17 | 1352 | const void *entry, |
c4986734 | 1353 | const struct xt_match *match, |
1da177e4 LT |
1354 | void *matchinfo, |
1355 | unsigned int matchsize, | |
1356 | unsigned int hook_mask) | |
1357 | { | |
1358 | const struct ip6t_icmp *icmpinfo = matchinfo; | |
1359 | ||
7f939713 PM |
1360 | /* Must specify no unknown invflags */ |
1361 | return !(icmpinfo->invflags & ~IP6T_ICMP_INV); | |
1da177e4 LT |
1362 | } |
1363 | ||
1364 | /* The built-in targets: standard (NULL) and error. */ | |
1365 | static struct ip6t_target ip6t_standard_target = { | |
1366 | .name = IP6T_STANDARD_TARGET, | |
7f939713 | 1367 | .targetsize = sizeof(int), |
a45049c5 | 1368 | .family = AF_INET6, |
1da177e4 LT |
1369 | }; |
1370 | ||
1371 | static struct ip6t_target ip6t_error_target = { | |
1372 | .name = IP6T_ERROR_TARGET, | |
1373 | .target = ip6t_error, | |
7f939713 | 1374 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, |
a45049c5 | 1375 | .family = AF_INET6, |
1da177e4 LT |
1376 | }; |
1377 | ||
1378 | static struct nf_sockopt_ops ip6t_sockopts = { | |
1379 | .pf = PF_INET6, | |
1380 | .set_optmin = IP6T_BASE_CTL, | |
1381 | .set_optmax = IP6T_SO_SET_MAX+1, | |
1382 | .set = do_ip6t_set_ctl, | |
1383 | .get_optmin = IP6T_BASE_CTL, | |
1384 | .get_optmax = IP6T_SO_GET_MAX+1, | |
1385 | .get = do_ip6t_get_ctl, | |
1386 | }; | |
1387 | ||
1da177e4 LT |
1388 | static struct ip6t_match icmp6_matchstruct = { |
1389 | .name = "icmp6", | |
1390 | .match = &icmp6_match, | |
7f939713 PM |
1391 | .matchsize = sizeof(struct ip6t_icmp), |
1392 | .checkentry = icmp6_checkentry, | |
1393 | .proto = IPPROTO_ICMPV6, | |
a45049c5 | 1394 | .family = AF_INET6, |
1da177e4 LT |
1395 | }; |
1396 | ||
65b4b4e8 | 1397 | static int __init ip6_tables_init(void) |
1da177e4 LT |
1398 | { |
1399 | int ret; | |
1400 | ||
2e4e6a17 HW |
1401 | xt_proto_init(AF_INET6); |
1402 | ||
1da177e4 | 1403 | /* Noone else will be downing sem now, so we won't sleep */ |
a45049c5 PNA |
1404 | xt_register_target(&ip6t_standard_target); |
1405 | xt_register_target(&ip6t_error_target); | |
1406 | xt_register_match(&icmp6_matchstruct); | |
1da177e4 LT |
1407 | |
1408 | /* Register setsockopt */ | |
1409 | ret = nf_register_sockopt(&ip6t_sockopts); | |
1410 | if (ret < 0) { | |
1411 | duprintf("Unable to register sockopts.\n"); | |
2e4e6a17 | 1412 | xt_proto_fini(AF_INET6); |
1da177e4 LT |
1413 | return ret; |
1414 | } | |
1415 | ||
2e4e6a17 | 1416 | printk("ip6_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 LT |
1417 | return 0; |
1418 | } | |
1419 | ||
65b4b4e8 | 1420 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
1421 | { |
1422 | nf_unregister_sockopt(&ip6t_sockopts); | |
a45049c5 PNA |
1423 | xt_unregister_match(&icmp6_matchstruct); |
1424 | xt_unregister_target(&ip6t_error_target); | |
1425 | xt_unregister_target(&ip6t_standard_target); | |
2e4e6a17 | 1426 | xt_proto_fini(AF_INET6); |
1da177e4 LT |
1427 | } |
1428 | ||
e674d0f3 | 1429 | /* |
b777e0ce PM |
1430 | * find the offset to specified header or the protocol number of last header |
1431 | * if target < 0. "last header" is transport protocol header, ESP, or | |
1432 | * "No next header". | |
1433 | * | |
1434 | * If target header is found, its offset is set in *offset and return protocol | |
1435 | * number. Otherwise, return -1. | |
1436 | * | |
1437 | * Note that non-1st fragment is special case that "the protocol number | |
1438 | * of last header" is "next header" field in Fragment header. In this case, | |
1439 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
1440 | * isn't NULL. | |
e674d0f3 | 1441 | * |
e674d0f3 | 1442 | */ |
b777e0ce PM |
1443 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
1444 | int target, unsigned short *fragoff) | |
e674d0f3 YK |
1445 | { |
1446 | unsigned int start = (u8*)(skb->nh.ipv6h + 1) - skb->data; | |
1447 | u8 nexthdr = skb->nh.ipv6h->nexthdr; | |
1448 | unsigned int len = skb->len - start; | |
1449 | ||
b777e0ce PM |
1450 | if (fragoff) |
1451 | *fragoff = 0; | |
1452 | ||
e674d0f3 YK |
1453 | while (nexthdr != target) { |
1454 | struct ipv6_opt_hdr _hdr, *hp; | |
1455 | unsigned int hdrlen; | |
1456 | ||
b777e0ce PM |
1457 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
1458 | if (target < 0) | |
1459 | break; | |
e674d0f3 | 1460 | return -1; |
b777e0ce PM |
1461 | } |
1462 | ||
e674d0f3 YK |
1463 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
1464 | if (hp == NULL) | |
1465 | return -1; | |
1466 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
1467 | unsigned short _frag_off, *fp; | |
1468 | fp = skb_header_pointer(skb, | |
1469 | start+offsetof(struct frag_hdr, | |
1470 | frag_off), | |
1471 | sizeof(_frag_off), | |
1472 | &_frag_off); | |
1473 | if (fp == NULL) | |
1474 | return -1; | |
1475 | ||
b777e0ce PM |
1476 | _frag_off = ntohs(*fp) & ~0x7; |
1477 | if (_frag_off) { | |
1478 | if (target < 0 && | |
1479 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
1480 | nexthdr == NEXTHDR_NONE)) { | |
1481 | if (fragoff) | |
1482 | *fragoff = _frag_off; | |
1483 | return hp->nexthdr; | |
1484 | } | |
e674d0f3 | 1485 | return -1; |
b777e0ce | 1486 | } |
e674d0f3 YK |
1487 | hdrlen = 8; |
1488 | } else if (nexthdr == NEXTHDR_AUTH) | |
1489 | hdrlen = (hp->hdrlen + 2) << 2; | |
1490 | else | |
1491 | hdrlen = ipv6_optlen(hp); | |
1492 | ||
1493 | nexthdr = hp->nexthdr; | |
1494 | len -= hdrlen; | |
1495 | start += hdrlen; | |
1496 | } | |
1497 | ||
1498 | *offset = start; | |
b777e0ce | 1499 | return nexthdr; |
e674d0f3 YK |
1500 | } |
1501 | ||
1da177e4 LT |
1502 | EXPORT_SYMBOL(ip6t_register_table); |
1503 | EXPORT_SYMBOL(ip6t_unregister_table); | |
1504 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 1505 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 1506 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 1507 | |
65b4b4e8 AM |
1508 | module_init(ip6_tables_init); |
1509 | module_exit(ip6_tables_fini); |