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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 | |
2e4e6a17 | 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 | |
2e4e6a17 HW |
14 | * 08 Oct 2005 Harald Welte <lafore@netfilter.org> |
15 | * - Generalize into "x_tables" layer and "{ip,ip6,arp}_tables" | |
1da177e4 | 16 | */ |
1da177e4 | 17 | #include <linux/cache.h> |
4fc268d2 | 18 | #include <linux/capability.h> |
1da177e4 LT |
19 | #include <linux/skbuff.h> |
20 | #include <linux/kmod.h> | |
21 | #include <linux/vmalloc.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/module.h> | |
1da177e4 LT |
24 | #include <linux/icmp.h> |
25 | #include <net/ip.h> | |
2722971c | 26 | #include <net/compat.h> |
1da177e4 | 27 | #include <asm/uaccess.h> |
57b47a53 | 28 | #include <linux/mutex.h> |
1da177e4 LT |
29 | #include <linux/proc_fs.h> |
30 | #include <linux/err.h> | |
c8923c6b | 31 | #include <linux/cpumask.h> |
1da177e4 | 32 | |
2e4e6a17 | 33 | #include <linux/netfilter/x_tables.h> |
1da177e4 LT |
34 | #include <linux/netfilter_ipv4/ip_tables.h> |
35 | ||
36 | MODULE_LICENSE("GPL"); | |
37 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
38 | MODULE_DESCRIPTION("IPv4 packet filter"); | |
39 | ||
40 | /*#define DEBUG_IP_FIREWALL*/ | |
41 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
42 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
43 | ||
44 | #ifdef DEBUG_IP_FIREWALL | |
45 | #define dprintf(format, args...) printk(format , ## args) | |
46 | #else | |
47 | #define dprintf(format, args...) | |
48 | #endif | |
49 | ||
50 | #ifdef DEBUG_IP_FIREWALL_USER | |
51 | #define duprintf(format, args...) printk(format , ## args) | |
52 | #else | |
53 | #define duprintf(format, args...) | |
54 | #endif | |
55 | ||
56 | #ifdef CONFIG_NETFILTER_DEBUG | |
57 | #define IP_NF_ASSERT(x) \ | |
58 | do { \ | |
59 | if (!(x)) \ | |
60 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ | |
61 | __FUNCTION__, __FILE__, __LINE__); \ | |
62 | } while(0) | |
63 | #else | |
64 | #define IP_NF_ASSERT(x) | |
65 | #endif | |
1da177e4 LT |
66 | |
67 | #if 0 | |
68 | /* All the better to debug you with... */ | |
69 | #define static | |
70 | #define inline | |
71 | #endif | |
72 | ||
73 | /* | |
74 | We keep a set of rules for each CPU, so we can avoid write-locking | |
75 | them in the softirq when updating the counters and therefore | |
76 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
77 | context stops packets coming through and allows user context to read | |
78 | the counters or update the rules. | |
79 | ||
1da177e4 LT |
80 | Hence the start of any table is given by get_table() below. */ |
81 | ||
1da177e4 LT |
82 | /* Returns whether matches rule or not. */ |
83 | static inline int | |
84 | ip_packet_match(const struct iphdr *ip, | |
85 | const char *indev, | |
86 | const char *outdev, | |
87 | const struct ipt_ip *ipinfo, | |
88 | int isfrag) | |
89 | { | |
90 | size_t i; | |
91 | unsigned long ret; | |
92 | ||
93 | #define FWINV(bool,invflg) ((bool) ^ !!(ipinfo->invflags & invflg)) | |
94 | ||
95 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, | |
96 | IPT_INV_SRCIP) | |
97 | || FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, | |
98 | IPT_INV_DSTIP)) { | |
99 | dprintf("Source or dest mismatch.\n"); | |
100 | ||
101 | dprintf("SRC: %u.%u.%u.%u. Mask: %u.%u.%u.%u. Target: %u.%u.%u.%u.%s\n", | |
102 | NIPQUAD(ip->saddr), | |
103 | NIPQUAD(ipinfo->smsk.s_addr), | |
104 | NIPQUAD(ipinfo->src.s_addr), | |
105 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); | |
106 | dprintf("DST: %u.%u.%u.%u Mask: %u.%u.%u.%u Target: %u.%u.%u.%u.%s\n", | |
107 | NIPQUAD(ip->daddr), | |
108 | NIPQUAD(ipinfo->dmsk.s_addr), | |
109 | NIPQUAD(ipinfo->dst.s_addr), | |
110 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); | |
111 | return 0; | |
112 | } | |
113 | ||
114 | /* Look for ifname matches; this should unroll nicely. */ | |
115 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
116 | ret |= (((const unsigned long *)indev)[i] | |
117 | ^ ((const unsigned long *)ipinfo->iniface)[i]) | |
118 | & ((const unsigned long *)ipinfo->iniface_mask)[i]; | |
119 | } | |
120 | ||
121 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { | |
122 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
123 | indev, ipinfo->iniface, | |
124 | ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":""); | |
125 | return 0; | |
126 | } | |
127 | ||
128 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
129 | ret |= (((const unsigned long *)outdev)[i] | |
130 | ^ ((const unsigned long *)ipinfo->outiface)[i]) | |
131 | & ((const unsigned long *)ipinfo->outiface_mask)[i]; | |
132 | } | |
133 | ||
134 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { | |
135 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
136 | outdev, ipinfo->outiface, | |
137 | ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":""); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | /* Check specific protocol */ | |
142 | if (ipinfo->proto | |
143 | && FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { | |
144 | dprintf("Packet protocol %hi does not match %hi.%s\n", | |
145 | ip->protocol, ipinfo->proto, | |
146 | ipinfo->invflags&IPT_INV_PROTO ? " (INV)":""); | |
147 | return 0; | |
148 | } | |
149 | ||
150 | /* If we have a fragment rule but the packet is not a fragment | |
151 | * then we return zero */ | |
152 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { | |
153 | dprintf("Fragment rule but not fragment.%s\n", | |
154 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); | |
155 | return 0; | |
156 | } | |
157 | ||
158 | return 1; | |
159 | } | |
160 | ||
161 | static inline int | |
162 | ip_checkentry(const struct ipt_ip *ip) | |
163 | { | |
164 | if (ip->flags & ~IPT_F_MASK) { | |
165 | duprintf("Unknown flag bits set: %08X\n", | |
166 | ip->flags & ~IPT_F_MASK); | |
167 | return 0; | |
168 | } | |
169 | if (ip->invflags & ~IPT_INV_MASK) { | |
170 | duprintf("Unknown invflag bits set: %08X\n", | |
171 | ip->invflags & ~IPT_INV_MASK); | |
172 | return 0; | |
173 | } | |
174 | return 1; | |
175 | } | |
176 | ||
177 | static unsigned int | |
178 | ipt_error(struct sk_buff **pskb, | |
179 | const struct net_device *in, | |
180 | const struct net_device *out, | |
181 | unsigned int hooknum, | |
c4986734 | 182 | const struct xt_target *target, |
fe1cb108 | 183 | const void *targinfo) |
1da177e4 LT |
184 | { |
185 | if (net_ratelimit()) | |
186 | printk("ip_tables: error: `%s'\n", (char *)targinfo); | |
187 | ||
188 | return NF_DROP; | |
189 | } | |
190 | ||
191 | static inline | |
192 | int do_match(struct ipt_entry_match *m, | |
193 | const struct sk_buff *skb, | |
194 | const struct net_device *in, | |
195 | const struct net_device *out, | |
196 | int offset, | |
197 | int *hotdrop) | |
198 | { | |
199 | /* Stop iteration if it doesn't match */ | |
1c524830 PM |
200 | if (!m->u.kernel.match->match(skb, in, out, m->u.kernel.match, m->data, |
201 | offset, skb->nh.iph->ihl*4, hotdrop)) | |
1da177e4 LT |
202 | return 1; |
203 | else | |
204 | return 0; | |
205 | } | |
206 | ||
207 | static inline struct ipt_entry * | |
208 | get_entry(void *base, unsigned int offset) | |
209 | { | |
210 | return (struct ipt_entry *)(base + offset); | |
211 | } | |
212 | ||
213 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ | |
214 | unsigned int | |
215 | ipt_do_table(struct sk_buff **pskb, | |
216 | unsigned int hook, | |
217 | const struct net_device *in, | |
218 | const struct net_device *out, | |
fe1cb108 | 219 | struct ipt_table *table) |
1da177e4 LT |
220 | { |
221 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); | |
222 | u_int16_t offset; | |
223 | struct iphdr *ip; | |
224 | u_int16_t datalen; | |
225 | int hotdrop = 0; | |
226 | /* Initializing verdict to NF_DROP keeps gcc happy. */ | |
227 | unsigned int verdict = NF_DROP; | |
228 | const char *indev, *outdev; | |
229 | void *table_base; | |
230 | struct ipt_entry *e, *back; | |
8311731a | 231 | struct xt_table_info *private; |
1da177e4 LT |
232 | |
233 | /* Initialization */ | |
234 | ip = (*pskb)->nh.iph; | |
235 | datalen = (*pskb)->len - ip->ihl * 4; | |
236 | indev = in ? in->name : nulldevname; | |
237 | outdev = out ? out->name : nulldevname; | |
238 | /* We handle fragments by dealing with the first fragment as | |
239 | * if it was a normal packet. All other fragments are treated | |
240 | * normally, except that they will NEVER match rules that ask | |
241 | * things we don't know, ie. tcp syn flag or ports). If the | |
242 | * rule is also a fragment-specific rule, non-fragments won't | |
243 | * match it. */ | |
244 | offset = ntohs(ip->frag_off) & IP_OFFSET; | |
245 | ||
246 | read_lock_bh(&table->lock); | |
247 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); | |
8311731a | 248 | private = table->private; |
2e4e6a17 HW |
249 | table_base = (void *)private->entries[smp_processor_id()]; |
250 | e = get_entry(table_base, private->hook_entry[hook]); | |
1da177e4 LT |
251 | |
252 | /* For return from builtin chain */ | |
2e4e6a17 | 253 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
254 | |
255 | do { | |
256 | IP_NF_ASSERT(e); | |
257 | IP_NF_ASSERT(back); | |
1da177e4 LT |
258 | if (ip_packet_match(ip, indev, outdev, &e->ip, offset)) { |
259 | struct ipt_entry_target *t; | |
260 | ||
261 | if (IPT_MATCH_ITERATE(e, do_match, | |
262 | *pskb, in, out, | |
263 | offset, &hotdrop) != 0) | |
264 | goto no_match; | |
265 | ||
266 | ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1); | |
267 | ||
268 | t = ipt_get_target(e); | |
269 | IP_NF_ASSERT(t->u.kernel.target); | |
270 | /* Standard target? */ | |
271 | if (!t->u.kernel.target->target) { | |
272 | int v; | |
273 | ||
274 | v = ((struct ipt_standard_target *)t)->verdict; | |
275 | if (v < 0) { | |
276 | /* Pop from stack? */ | |
277 | if (v != IPT_RETURN) { | |
278 | verdict = (unsigned)(-v) - 1; | |
279 | break; | |
280 | } | |
281 | e = back; | |
282 | back = get_entry(table_base, | |
283 | back->comefrom); | |
284 | continue; | |
285 | } | |
05465343 PM |
286 | if (table_base + v != (void *)e + e->next_offset |
287 | && !(e->ip.flags & IPT_F_GOTO)) { | |
1da177e4 LT |
288 | /* Save old back ptr in next entry */ |
289 | struct ipt_entry *next | |
290 | = (void *)e + e->next_offset; | |
291 | next->comefrom | |
292 | = (void *)back - table_base; | |
293 | /* set back pointer to next entry */ | |
294 | back = next; | |
295 | } | |
296 | ||
297 | e = get_entry(table_base, v); | |
298 | } else { | |
299 | /* Targets which reenter must return | |
300 | abs. verdicts */ | |
301 | #ifdef CONFIG_NETFILTER_DEBUG | |
302 | ((struct ipt_entry *)table_base)->comefrom | |
303 | = 0xeeeeeeec; | |
304 | #endif | |
305 | verdict = t->u.kernel.target->target(pskb, | |
306 | in, out, | |
307 | hook, | |
1c524830 | 308 | t->u.kernel.target, |
fe1cb108 | 309 | t->data); |
1da177e4 LT |
310 | |
311 | #ifdef CONFIG_NETFILTER_DEBUG | |
312 | if (((struct ipt_entry *)table_base)->comefrom | |
313 | != 0xeeeeeeec | |
314 | && verdict == IPT_CONTINUE) { | |
315 | printk("Target %s reentered!\n", | |
316 | t->u.kernel.target->name); | |
317 | verdict = NF_DROP; | |
318 | } | |
319 | ((struct ipt_entry *)table_base)->comefrom | |
320 | = 0x57acc001; | |
321 | #endif | |
322 | /* Target might have changed stuff. */ | |
323 | ip = (*pskb)->nh.iph; | |
324 | datalen = (*pskb)->len - ip->ihl * 4; | |
325 | ||
326 | if (verdict == IPT_CONTINUE) | |
327 | e = (void *)e + e->next_offset; | |
328 | else | |
329 | /* Verdict */ | |
330 | break; | |
331 | } | |
332 | } else { | |
333 | ||
334 | no_match: | |
335 | e = (void *)e + e->next_offset; | |
336 | } | |
337 | } while (!hotdrop); | |
338 | ||
1da177e4 LT |
339 | read_unlock_bh(&table->lock); |
340 | ||
341 | #ifdef DEBUG_ALLOW_ALL | |
342 | return NF_ACCEPT; | |
343 | #else | |
344 | if (hotdrop) | |
345 | return NF_DROP; | |
346 | else return verdict; | |
347 | #endif | |
348 | } | |
349 | ||
1da177e4 LT |
350 | /* All zeroes == unconditional rule. */ |
351 | static inline int | |
352 | unconditional(const struct ipt_ip *ip) | |
353 | { | |
354 | unsigned int i; | |
355 | ||
356 | for (i = 0; i < sizeof(*ip)/sizeof(__u32); i++) | |
357 | if (((__u32 *)ip)[i]) | |
358 | return 0; | |
359 | ||
360 | return 1; | |
361 | } | |
362 | ||
363 | /* Figures out from what hook each rule can be called: returns 0 if | |
364 | there are loops. Puts hook bitmask in comefrom. */ | |
365 | static int | |
2e4e6a17 | 366 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 367 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
368 | { |
369 | unsigned int hook; | |
370 | ||
371 | /* No recursion; use packet counter to save back ptrs (reset | |
372 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
373 | for (hook = 0; hook < NF_IP_NUMHOOKS; hook++) { | |
374 | unsigned int pos = newinfo->hook_entry[hook]; | |
375 | struct ipt_entry *e | |
31836064 | 376 | = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
377 | |
378 | if (!(valid_hooks & (1 << hook))) | |
379 | continue; | |
380 | ||
381 | /* Set initial back pointer. */ | |
382 | e->counters.pcnt = pos; | |
383 | ||
384 | for (;;) { | |
385 | struct ipt_standard_target *t | |
386 | = (void *)ipt_get_target(e); | |
387 | ||
388 | if (e->comefrom & (1 << NF_IP_NUMHOOKS)) { | |
389 | printk("iptables: loop hook %u pos %u %08X.\n", | |
390 | hook, pos, e->comefrom); | |
391 | return 0; | |
392 | } | |
393 | e->comefrom | |
394 | |= ((1 << hook) | (1 << NF_IP_NUMHOOKS)); | |
395 | ||
396 | /* Unconditional return/END. */ | |
397 | if (e->target_offset == sizeof(struct ipt_entry) | |
398 | && (strcmp(t->target.u.user.name, | |
399 | IPT_STANDARD_TARGET) == 0) | |
400 | && t->verdict < 0 | |
401 | && unconditional(&e->ip)) { | |
402 | unsigned int oldpos, size; | |
403 | ||
404 | /* Return: backtrack through the last | |
405 | big jump. */ | |
406 | do { | |
407 | e->comefrom ^= (1<<NF_IP_NUMHOOKS); | |
408 | #ifdef DEBUG_IP_FIREWALL_USER | |
409 | if (e->comefrom | |
410 | & (1 << NF_IP_NUMHOOKS)) { | |
411 | duprintf("Back unset " | |
412 | "on hook %u " | |
413 | "rule %u\n", | |
414 | hook, pos); | |
415 | } | |
416 | #endif | |
417 | oldpos = pos; | |
418 | pos = e->counters.pcnt; | |
419 | e->counters.pcnt = 0; | |
420 | ||
421 | /* We're at the start. */ | |
422 | if (pos == oldpos) | |
423 | goto next; | |
424 | ||
425 | e = (struct ipt_entry *) | |
31836064 | 426 | (entry0 + pos); |
1da177e4 LT |
427 | } while (oldpos == pos + e->next_offset); |
428 | ||
429 | /* Move along one */ | |
430 | size = e->next_offset; | |
431 | e = (struct ipt_entry *) | |
31836064 | 432 | (entry0 + pos + size); |
1da177e4 LT |
433 | e->counters.pcnt = pos; |
434 | pos += size; | |
435 | } else { | |
436 | int newpos = t->verdict; | |
437 | ||
438 | if (strcmp(t->target.u.user.name, | |
439 | IPT_STANDARD_TARGET) == 0 | |
440 | && newpos >= 0) { | |
441 | /* This a jump; chase it. */ | |
442 | duprintf("Jump rule %u -> %u\n", | |
443 | pos, newpos); | |
444 | } else { | |
445 | /* ... this is a fallthru */ | |
446 | newpos = pos + e->next_offset; | |
447 | } | |
448 | e = (struct ipt_entry *) | |
31836064 | 449 | (entry0 + newpos); |
1da177e4 LT |
450 | e->counters.pcnt = pos; |
451 | pos = newpos; | |
452 | } | |
453 | } | |
454 | next: | |
455 | duprintf("Finished chain %u\n", hook); | |
456 | } | |
457 | return 1; | |
458 | } | |
459 | ||
460 | static inline int | |
461 | cleanup_match(struct ipt_entry_match *m, unsigned int *i) | |
462 | { | |
463 | if (i && (*i)-- == 0) | |
464 | return 1; | |
465 | ||
466 | if (m->u.kernel.match->destroy) | |
efa74165 | 467 | m->u.kernel.match->destroy(m->u.kernel.match, m->data); |
1da177e4 LT |
468 | module_put(m->u.kernel.match->me); |
469 | return 0; | |
470 | } | |
471 | ||
472 | static inline int | |
473 | standard_check(const struct ipt_entry_target *t, | |
474 | unsigned int max_offset) | |
475 | { | |
476 | struct ipt_standard_target *targ = (void *)t; | |
477 | ||
478 | /* Check standard info. */ | |
1da177e4 LT |
479 | if (targ->verdict >= 0 |
480 | && targ->verdict > max_offset - sizeof(struct ipt_entry)) { | |
481 | duprintf("ipt_standard_check: bad verdict (%i)\n", | |
482 | targ->verdict); | |
483 | return 0; | |
484 | } | |
1da177e4 LT |
485 | if (targ->verdict < -NF_MAX_VERDICT - 1) { |
486 | duprintf("ipt_standard_check: bad negative verdict (%i)\n", | |
487 | targ->verdict); | |
488 | return 0; | |
489 | } | |
490 | return 1; | |
491 | } | |
492 | ||
493 | static inline int | |
494 | check_match(struct ipt_entry_match *m, | |
495 | const char *name, | |
496 | const struct ipt_ip *ip, | |
497 | unsigned int hookmask, | |
498 | unsigned int *i) | |
499 | { | |
500 | struct ipt_match *match; | |
3cdc7c95 | 501 | int ret; |
1da177e4 | 502 | |
2e4e6a17 | 503 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, |
1da177e4 LT |
504 | m->u.user.revision), |
505 | "ipt_%s", m->u.user.name); | |
506 | if (IS_ERR(match) || !match) { | |
507 | duprintf("check_match: `%s' not found\n", m->u.user.name); | |
508 | return match ? PTR_ERR(match) : -ENOENT; | |
509 | } | |
510 | m->u.kernel.match = match; | |
511 | ||
3cdc7c95 PM |
512 | ret = xt_check_match(match, AF_INET, m->u.match_size - sizeof(*m), |
513 | name, hookmask, ip->proto, | |
514 | ip->invflags & IPT_INV_PROTO); | |
515 | if (ret) | |
516 | goto err; | |
517 | ||
1da177e4 | 518 | if (m->u.kernel.match->checkentry |
1c524830 | 519 | && !m->u.kernel.match->checkentry(name, ip, match, m->data, |
1da177e4 | 520 | hookmask)) { |
1da177e4 LT |
521 | duprintf("ip_tables: check failed for `%s'.\n", |
522 | m->u.kernel.match->name); | |
3cdc7c95 PM |
523 | ret = -EINVAL; |
524 | goto err; | |
1da177e4 LT |
525 | } |
526 | ||
527 | (*i)++; | |
528 | return 0; | |
3cdc7c95 PM |
529 | err: |
530 | module_put(m->u.kernel.match->me); | |
531 | return ret; | |
1da177e4 LT |
532 | } |
533 | ||
534 | static struct ipt_target ipt_standard_target; | |
535 | ||
536 | static inline int | |
537 | check_entry(struct ipt_entry *e, const char *name, unsigned int size, | |
538 | unsigned int *i) | |
539 | { | |
540 | struct ipt_entry_target *t; | |
541 | struct ipt_target *target; | |
542 | int ret; | |
543 | unsigned int j; | |
544 | ||
545 | if (!ip_checkentry(&e->ip)) { | |
546 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
547 | return -EINVAL; | |
548 | } | |
549 | ||
550 | j = 0; | |
551 | ret = IPT_MATCH_ITERATE(e, check_match, name, &e->ip, e->comefrom, &j); | |
552 | if (ret != 0) | |
553 | goto cleanup_matches; | |
554 | ||
555 | t = ipt_get_target(e); | |
2e4e6a17 HW |
556 | target = try_then_request_module(xt_find_target(AF_INET, |
557 | t->u.user.name, | |
1da177e4 LT |
558 | t->u.user.revision), |
559 | "ipt_%s", t->u.user.name); | |
560 | if (IS_ERR(target) || !target) { | |
561 | duprintf("check_entry: `%s' not found\n", t->u.user.name); | |
562 | ret = target ? PTR_ERR(target) : -ENOENT; | |
563 | goto cleanup_matches; | |
564 | } | |
565 | t->u.kernel.target = target; | |
566 | ||
3cdc7c95 PM |
567 | ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t), |
568 | name, e->comefrom, e->ip.proto, | |
569 | e->ip.invflags & IPT_INV_PROTO); | |
570 | if (ret) | |
571 | goto err; | |
572 | ||
1da177e4 LT |
573 | if (t->u.kernel.target == &ipt_standard_target) { |
574 | if (!standard_check(t, size)) { | |
575 | ret = -EINVAL; | |
90d47db4 | 576 | goto err; |
1da177e4 LT |
577 | } |
578 | } else if (t->u.kernel.target->checkentry | |
1c524830 | 579 | && !t->u.kernel.target->checkentry(name, e, target, t->data, |
1da177e4 | 580 | e->comefrom)) { |
1da177e4 LT |
581 | duprintf("ip_tables: check failed for `%s'.\n", |
582 | t->u.kernel.target->name); | |
583 | ret = -EINVAL; | |
3cdc7c95 | 584 | goto err; |
1da177e4 LT |
585 | } |
586 | ||
587 | (*i)++; | |
588 | return 0; | |
3cdc7c95 PM |
589 | err: |
590 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
591 | cleanup_matches: |
592 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
593 | return ret; | |
594 | } | |
595 | ||
596 | static inline int | |
597 | check_entry_size_and_hooks(struct ipt_entry *e, | |
2e4e6a17 | 598 | struct xt_table_info *newinfo, |
1da177e4 LT |
599 | unsigned char *base, |
600 | unsigned char *limit, | |
601 | const unsigned int *hook_entries, | |
602 | const unsigned int *underflows, | |
603 | unsigned int *i) | |
604 | { | |
605 | unsigned int h; | |
606 | ||
607 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 | |
608 | || (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { | |
609 | duprintf("Bad offset %p\n", e); | |
610 | return -EINVAL; | |
611 | } | |
612 | ||
613 | if (e->next_offset | |
614 | < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) { | |
615 | duprintf("checking: element %p size %u\n", | |
616 | e, e->next_offset); | |
617 | return -EINVAL; | |
618 | } | |
619 | ||
620 | /* Check hooks & underflows */ | |
621 | for (h = 0; h < NF_IP_NUMHOOKS; h++) { | |
622 | if ((unsigned char *)e - base == hook_entries[h]) | |
623 | newinfo->hook_entry[h] = hook_entries[h]; | |
624 | if ((unsigned char *)e - base == underflows[h]) | |
625 | newinfo->underflow[h] = underflows[h]; | |
626 | } | |
627 | ||
628 | /* FIXME: underflows must be unconditional, standard verdicts | |
629 | < 0 (not IPT_RETURN). --RR */ | |
630 | ||
631 | /* Clear counters and comefrom */ | |
2e4e6a17 | 632 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
633 | e->comefrom = 0; |
634 | ||
635 | (*i)++; | |
636 | return 0; | |
637 | } | |
638 | ||
639 | static inline int | |
640 | cleanup_entry(struct ipt_entry *e, unsigned int *i) | |
641 | { | |
642 | struct ipt_entry_target *t; | |
643 | ||
644 | if (i && (*i)-- == 0) | |
645 | return 1; | |
646 | ||
647 | /* Cleanup all matches */ | |
648 | IPT_MATCH_ITERATE(e, cleanup_match, NULL); | |
649 | t = ipt_get_target(e); | |
650 | if (t->u.kernel.target->destroy) | |
efa74165 | 651 | t->u.kernel.target->destroy(t->u.kernel.target, t->data); |
1da177e4 LT |
652 | module_put(t->u.kernel.target->me); |
653 | return 0; | |
654 | } | |
655 | ||
656 | /* Checks and translates the user-supplied table segment (held in | |
657 | newinfo) */ | |
658 | static int | |
659 | translate_table(const char *name, | |
660 | unsigned int valid_hooks, | |
2e4e6a17 | 661 | struct xt_table_info *newinfo, |
31836064 | 662 | void *entry0, |
1da177e4 LT |
663 | unsigned int size, |
664 | unsigned int number, | |
665 | const unsigned int *hook_entries, | |
666 | const unsigned int *underflows) | |
667 | { | |
668 | unsigned int i; | |
669 | int ret; | |
670 | ||
671 | newinfo->size = size; | |
672 | newinfo->number = number; | |
673 | ||
674 | /* Init all hooks to impossible value. */ | |
675 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { | |
676 | newinfo->hook_entry[i] = 0xFFFFFFFF; | |
677 | newinfo->underflow[i] = 0xFFFFFFFF; | |
678 | } | |
679 | ||
680 | duprintf("translate_table: size %u\n", newinfo->size); | |
681 | i = 0; | |
682 | /* Walk through entries, checking offsets. */ | |
31836064 | 683 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
684 | check_entry_size_and_hooks, |
685 | newinfo, | |
31836064 ED |
686 | entry0, |
687 | entry0 + size, | |
1da177e4 LT |
688 | hook_entries, underflows, &i); |
689 | if (ret != 0) | |
690 | return ret; | |
691 | ||
692 | if (i != number) { | |
693 | duprintf("translate_table: %u not %u entries\n", | |
694 | i, number); | |
695 | return -EINVAL; | |
696 | } | |
697 | ||
698 | /* Check hooks all assigned */ | |
699 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { | |
700 | /* Only hooks which are valid */ | |
701 | if (!(valid_hooks & (1 << i))) | |
702 | continue; | |
703 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
704 | duprintf("Invalid hook entry %u %u\n", | |
705 | i, hook_entries[i]); | |
706 | return -EINVAL; | |
707 | } | |
708 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
709 | duprintf("Invalid underflow %u %u\n", | |
710 | i, underflows[i]); | |
711 | return -EINVAL; | |
712 | } | |
713 | } | |
714 | ||
31836064 | 715 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
1da177e4 LT |
716 | return -ELOOP; |
717 | ||
718 | /* Finally, each sanity check must pass */ | |
719 | i = 0; | |
31836064 | 720 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
721 | check_entry, name, size, &i); |
722 | ||
723 | if (ret != 0) { | |
31836064 | 724 | IPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
725 | cleanup_entry, &i); |
726 | return ret; | |
727 | } | |
728 | ||
729 | /* And one copy for every other CPU */ | |
6f912042 | 730 | for_each_possible_cpu(i) { |
31836064 ED |
731 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
732 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
733 | } |
734 | ||
735 | return ret; | |
736 | } | |
737 | ||
1da177e4 LT |
738 | /* Gets counters. */ |
739 | static inline int | |
740 | add_entry_to_counter(const struct ipt_entry *e, | |
2e4e6a17 | 741 | struct xt_counters total[], |
1da177e4 LT |
742 | unsigned int *i) |
743 | { | |
744 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
745 | ||
746 | (*i)++; | |
747 | return 0; | |
748 | } | |
749 | ||
31836064 ED |
750 | static inline int |
751 | set_entry_to_counter(const struct ipt_entry *e, | |
752 | struct ipt_counters total[], | |
753 | unsigned int *i) | |
754 | { | |
755 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
756 | ||
757 | (*i)++; | |
758 | return 0; | |
759 | } | |
760 | ||
1da177e4 | 761 | static void |
2e4e6a17 HW |
762 | get_counters(const struct xt_table_info *t, |
763 | struct xt_counters counters[]) | |
1da177e4 LT |
764 | { |
765 | unsigned int cpu; | |
766 | unsigned int i; | |
31836064 ED |
767 | unsigned int curcpu; |
768 | ||
769 | /* Instead of clearing (by a previous call to memset()) | |
770 | * the counters and using adds, we set the counters | |
771 | * with data used by 'current' CPU | |
772 | * We dont care about preemption here. | |
773 | */ | |
774 | curcpu = raw_smp_processor_id(); | |
775 | ||
776 | i = 0; | |
777 | IPT_ENTRY_ITERATE(t->entries[curcpu], | |
778 | t->size, | |
779 | set_entry_to_counter, | |
780 | counters, | |
781 | &i); | |
1da177e4 | 782 | |
6f912042 | 783 | for_each_possible_cpu(cpu) { |
31836064 ED |
784 | if (cpu == curcpu) |
785 | continue; | |
1da177e4 | 786 | i = 0; |
31836064 | 787 | IPT_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
788 | t->size, |
789 | add_entry_to_counter, | |
790 | counters, | |
791 | &i); | |
792 | } | |
793 | } | |
794 | ||
2722971c | 795 | static inline struct xt_counters * alloc_counters(struct ipt_table *table) |
1da177e4 | 796 | { |
2722971c | 797 | unsigned int countersize; |
2e4e6a17 HW |
798 | struct xt_counters *counters; |
799 | struct xt_table_info *private = table->private; | |
1da177e4 LT |
800 | |
801 | /* We need atomic snapshot of counters: rest doesn't change | |
802 | (other than comefrom, which userspace doesn't care | |
803 | about). */ | |
2e4e6a17 | 804 | countersize = sizeof(struct xt_counters) * private->number; |
31836064 | 805 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
806 | |
807 | if (counters == NULL) | |
2722971c | 808 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
809 | |
810 | /* First, sum counters... */ | |
1da177e4 | 811 | write_lock_bh(&table->lock); |
2e4e6a17 | 812 | get_counters(private, counters); |
1da177e4 LT |
813 | write_unlock_bh(&table->lock); |
814 | ||
2722971c DM |
815 | return counters; |
816 | } | |
817 | ||
818 | static int | |
819 | copy_entries_to_user(unsigned int total_size, | |
820 | struct ipt_table *table, | |
821 | void __user *userptr) | |
822 | { | |
823 | unsigned int off, num; | |
824 | struct ipt_entry *e; | |
825 | struct xt_counters *counters; | |
826 | struct xt_table_info *private = table->private; | |
827 | int ret = 0; | |
828 | void *loc_cpu_entry; | |
829 | ||
830 | counters = alloc_counters(table); | |
831 | if (IS_ERR(counters)) | |
832 | return PTR_ERR(counters); | |
833 | ||
31836064 ED |
834 | /* choose the copy that is on our node/cpu, ... |
835 | * This choice is lazy (because current thread is | |
836 | * allowed to migrate to another cpu) | |
837 | */ | |
2e4e6a17 | 838 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 ED |
839 | /* ... then copy entire thing ... */ |
840 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { | |
1da177e4 LT |
841 | ret = -EFAULT; |
842 | goto free_counters; | |
843 | } | |
844 | ||
845 | /* FIXME: use iterator macros --RR */ | |
846 | /* ... then go back and fix counters and names */ | |
847 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
848 | unsigned int i; | |
849 | struct ipt_entry_match *m; | |
850 | struct ipt_entry_target *t; | |
851 | ||
31836064 | 852 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
853 | if (copy_to_user(userptr + off |
854 | + offsetof(struct ipt_entry, counters), | |
855 | &counters[num], | |
856 | sizeof(counters[num])) != 0) { | |
857 | ret = -EFAULT; | |
858 | goto free_counters; | |
859 | } | |
860 | ||
861 | for (i = sizeof(struct ipt_entry); | |
862 | i < e->target_offset; | |
863 | i += m->u.match_size) { | |
864 | m = (void *)e + i; | |
865 | ||
866 | if (copy_to_user(userptr + off + i | |
867 | + offsetof(struct ipt_entry_match, | |
868 | u.user.name), | |
869 | m->u.kernel.match->name, | |
870 | strlen(m->u.kernel.match->name)+1) | |
871 | != 0) { | |
872 | ret = -EFAULT; | |
873 | goto free_counters; | |
874 | } | |
875 | } | |
876 | ||
877 | t = ipt_get_target(e); | |
878 | if (copy_to_user(userptr + off + e->target_offset | |
879 | + offsetof(struct ipt_entry_target, | |
880 | u.user.name), | |
881 | t->u.kernel.target->name, | |
882 | strlen(t->u.kernel.target->name)+1) != 0) { | |
883 | ret = -EFAULT; | |
884 | goto free_counters; | |
885 | } | |
886 | } | |
887 | ||
888 | free_counters: | |
889 | vfree(counters); | |
890 | return ret; | |
891 | } | |
892 | ||
2722971c DM |
893 | #ifdef CONFIG_COMPAT |
894 | struct compat_delta { | |
895 | struct compat_delta *next; | |
896 | u_int16_t offset; | |
897 | short delta; | |
898 | }; | |
899 | ||
900 | static struct compat_delta *compat_offsets = NULL; | |
901 | ||
902 | static int compat_add_offset(u_int16_t offset, short delta) | |
903 | { | |
904 | struct compat_delta *tmp; | |
905 | ||
906 | tmp = kmalloc(sizeof(struct compat_delta), GFP_KERNEL); | |
907 | if (!tmp) | |
908 | return -ENOMEM; | |
909 | tmp->offset = offset; | |
910 | tmp->delta = delta; | |
911 | if (compat_offsets) { | |
912 | tmp->next = compat_offsets->next; | |
913 | compat_offsets->next = tmp; | |
914 | } else { | |
915 | compat_offsets = tmp; | |
916 | tmp->next = NULL; | |
917 | } | |
918 | return 0; | |
919 | } | |
920 | ||
921 | static void compat_flush_offsets(void) | |
922 | { | |
923 | struct compat_delta *tmp, *next; | |
924 | ||
925 | if (compat_offsets) { | |
926 | for(tmp = compat_offsets; tmp; tmp = next) { | |
927 | next = tmp->next; | |
928 | kfree(tmp); | |
929 | } | |
930 | compat_offsets = NULL; | |
931 | } | |
932 | } | |
933 | ||
934 | static short compat_calc_jump(u_int16_t offset) | |
935 | { | |
936 | struct compat_delta *tmp; | |
937 | short delta; | |
938 | ||
939 | for(tmp = compat_offsets, delta = 0; tmp; tmp = tmp->next) | |
940 | if (tmp->offset < offset) | |
941 | delta += tmp->delta; | |
942 | return delta; | |
943 | } | |
944 | ||
945 | struct compat_ipt_standard_target | |
946 | { | |
947 | struct compat_xt_entry_target target; | |
948 | compat_int_t verdict; | |
949 | }; | |
950 | ||
2722971c DM |
951 | struct compat_ipt_standard |
952 | { | |
953 | struct compat_ipt_entry entry; | |
954 | struct compat_ipt_standard_target target; | |
955 | }; | |
956 | ||
46c5ea3c PM |
957 | #define IPT_ST_LEN XT_ALIGN(sizeof(struct ipt_standard_target)) |
958 | #define IPT_ST_COMPAT_LEN COMPAT_XT_ALIGN(sizeof(struct compat_ipt_standard_target)) | |
959 | #define IPT_ST_OFFSET (IPT_ST_LEN - IPT_ST_COMPAT_LEN) | |
960 | ||
2722971c DM |
961 | static int compat_ipt_standard_fn(void *target, |
962 | void **dstptr, int *size, int convert) | |
963 | { | |
964 | struct compat_ipt_standard_target compat_st, *pcompat_st; | |
965 | struct ipt_standard_target st, *pst; | |
966 | int ret; | |
967 | ||
968 | ret = 0; | |
969 | switch (convert) { | |
970 | case COMPAT_TO_USER: | |
46c5ea3c | 971 | pst = target; |
2722971c | 972 | memcpy(&compat_st.target, &pst->target, |
46c5ea3c | 973 | sizeof(compat_st.target)); |
2722971c DM |
974 | compat_st.verdict = pst->verdict; |
975 | if (compat_st.verdict > 0) | |
976 | compat_st.verdict -= | |
977 | compat_calc_jump(compat_st.verdict); | |
46c5ea3c PM |
978 | compat_st.target.u.user.target_size = IPT_ST_COMPAT_LEN; |
979 | if (copy_to_user(*dstptr, &compat_st, IPT_ST_COMPAT_LEN)) | |
2722971c DM |
980 | ret = -EFAULT; |
981 | *size -= IPT_ST_OFFSET; | |
46c5ea3c | 982 | *dstptr += IPT_ST_COMPAT_LEN; |
2722971c DM |
983 | break; |
984 | case COMPAT_FROM_USER: | |
46c5ea3c PM |
985 | pcompat_st = target; |
986 | memcpy(&st.target, &pcompat_st->target, IPT_ST_COMPAT_LEN); | |
2722971c DM |
987 | st.verdict = pcompat_st->verdict; |
988 | if (st.verdict > 0) | |
989 | st.verdict += compat_calc_jump(st.verdict); | |
46c5ea3c PM |
990 | st.target.u.user.target_size = IPT_ST_LEN; |
991 | memcpy(*dstptr, &st, IPT_ST_LEN); | |
2722971c | 992 | *size += IPT_ST_OFFSET; |
46c5ea3c | 993 | *dstptr += IPT_ST_LEN; |
2722971c DM |
994 | break; |
995 | case COMPAT_CALC_SIZE: | |
996 | *size += IPT_ST_OFFSET; | |
997 | break; | |
998 | default: | |
999 | ret = -ENOPROTOOPT; | |
1000 | break; | |
1001 | } | |
1002 | return ret; | |
1003 | } | |
1004 | ||
1005 | static inline int | |
1006 | compat_calc_match(struct ipt_entry_match *m, int * size) | |
1007 | { | |
1008 | if (m->u.kernel.match->compat) | |
1009 | m->u.kernel.match->compat(m, NULL, size, COMPAT_CALC_SIZE); | |
1010 | else | |
1011 | xt_compat_match(m, NULL, size, COMPAT_CALC_SIZE); | |
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | static int compat_calc_entry(struct ipt_entry *e, struct xt_table_info *info, | |
1016 | void *base, struct xt_table_info *newinfo) | |
1017 | { | |
1018 | struct ipt_entry_target *t; | |
1019 | u_int16_t entry_offset; | |
1020 | int off, i, ret; | |
1021 | ||
1022 | off = 0; | |
1023 | entry_offset = (void *)e - base; | |
1024 | IPT_MATCH_ITERATE(e, compat_calc_match, &off); | |
1025 | t = ipt_get_target(e); | |
1026 | if (t->u.kernel.target->compat) | |
1027 | t->u.kernel.target->compat(t, NULL, &off, COMPAT_CALC_SIZE); | |
1028 | else | |
1029 | xt_compat_target(t, NULL, &off, COMPAT_CALC_SIZE); | |
1030 | newinfo->size -= off; | |
1031 | ret = compat_add_offset(entry_offset, off); | |
1032 | if (ret) | |
1033 | return ret; | |
1034 | ||
1035 | for (i = 0; i< NF_IP_NUMHOOKS; i++) { | |
1036 | if (info->hook_entry[i] && (e < (struct ipt_entry *) | |
1037 | (base + info->hook_entry[i]))) | |
1038 | newinfo->hook_entry[i] -= off; | |
1039 | if (info->underflow[i] && (e < (struct ipt_entry *) | |
1040 | (base + info->underflow[i]))) | |
1041 | newinfo->underflow[i] -= off; | |
1042 | } | |
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | static int compat_table_info(struct xt_table_info *info, | |
1047 | struct xt_table_info *newinfo) | |
1048 | { | |
1049 | void *loc_cpu_entry; | |
1050 | int i; | |
1051 | ||
1052 | if (!newinfo || !info) | |
1053 | return -EINVAL; | |
1054 | ||
1055 | memset(newinfo, 0, sizeof(struct xt_table_info)); | |
1056 | newinfo->size = info->size; | |
1057 | newinfo->number = info->number; | |
1058 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { | |
1059 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1060 | newinfo->underflow[i] = info->underflow[i]; | |
1061 | } | |
1062 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
1063 | return IPT_ENTRY_ITERATE(loc_cpu_entry, info->size, | |
1064 | compat_calc_entry, info, loc_cpu_entry, newinfo); | |
1065 | } | |
1066 | #endif | |
1067 | ||
1068 | static int get_info(void __user *user, int *len, int compat) | |
1069 | { | |
1070 | char name[IPT_TABLE_MAXNAMELEN]; | |
1071 | struct ipt_table *t; | |
1072 | int ret; | |
1073 | ||
1074 | if (*len != sizeof(struct ipt_getinfo)) { | |
1075 | duprintf("length %u != %u\n", *len, | |
1076 | (unsigned int)sizeof(struct ipt_getinfo)); | |
1077 | return -EINVAL; | |
1078 | } | |
1079 | ||
1080 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1081 | return -EFAULT; | |
1082 | ||
1083 | name[IPT_TABLE_MAXNAMELEN-1] = '\0'; | |
1084 | #ifdef CONFIG_COMPAT | |
1085 | if (compat) | |
1086 | xt_compat_lock(AF_INET); | |
1087 | #endif | |
1088 | t = try_then_request_module(xt_find_table_lock(AF_INET, name), | |
1089 | "iptable_%s", name); | |
1090 | if (t && !IS_ERR(t)) { | |
1091 | struct ipt_getinfo info; | |
1092 | struct xt_table_info *private = t->private; | |
1093 | ||
1094 | #ifdef CONFIG_COMPAT | |
1095 | if (compat) { | |
1096 | struct xt_table_info tmp; | |
1097 | ret = compat_table_info(private, &tmp); | |
1098 | compat_flush_offsets(); | |
1099 | private = &tmp; | |
1100 | } | |
1101 | #endif | |
1102 | info.valid_hooks = t->valid_hooks; | |
1103 | memcpy(info.hook_entry, private->hook_entry, | |
1104 | sizeof(info.hook_entry)); | |
1105 | memcpy(info.underflow, private->underflow, | |
1106 | sizeof(info.underflow)); | |
1107 | info.num_entries = private->number; | |
1108 | info.size = private->size; | |
1109 | strcpy(info.name, name); | |
1110 | ||
1111 | if (copy_to_user(user, &info, *len) != 0) | |
1112 | ret = -EFAULT; | |
1113 | else | |
1114 | ret = 0; | |
1115 | ||
1116 | xt_table_unlock(t); | |
1117 | module_put(t->me); | |
1118 | } else | |
1119 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1120 | #ifdef CONFIG_COMPAT | |
1121 | if (compat) | |
1122 | xt_compat_unlock(AF_INET); | |
1123 | #endif | |
1124 | return ret; | |
1125 | } | |
1126 | ||
1127 | static int | |
1128 | get_entries(struct ipt_get_entries __user *uptr, int *len) | |
1129 | { | |
1130 | int ret; | |
1131 | struct ipt_get_entries get; | |
1132 | struct ipt_table *t; | |
1133 | ||
1134 | if (*len < sizeof(get)) { | |
1135 | duprintf("get_entries: %u < %d\n", *len, | |
1136 | (unsigned int)sizeof(get)); | |
1137 | return -EINVAL; | |
1138 | } | |
1139 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1140 | return -EFAULT; | |
1141 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
1142 | duprintf("get_entries: %u != %u\n", *len, | |
1143 | (unsigned int)(sizeof(struct ipt_get_entries) + | |
1144 | get.size)); | |
1145 | return -EINVAL; | |
1146 | } | |
1147 | ||
1148 | t = xt_find_table_lock(AF_INET, get.name); | |
1149 | if (t && !IS_ERR(t)) { | |
1150 | struct xt_table_info *private = t->private; | |
1151 | duprintf("t->private->number = %u\n", | |
1152 | private->number); | |
1153 | if (get.size == private->size) | |
1154 | ret = copy_entries_to_user(private->size, | |
1155 | t, uptr->entrytable); | |
1156 | else { | |
1157 | duprintf("get_entries: I've got %u not %u!\n", | |
1158 | private->size, | |
1159 | get.size); | |
1160 | ret = -EINVAL; | |
1161 | } | |
1162 | module_put(t->me); | |
1163 | xt_table_unlock(t); | |
1164 | } else | |
1165 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1166 | ||
1167 | return ret; | |
1168 | } | |
1169 | ||
1170 | static int | |
1171 | __do_replace(const char *name, unsigned int valid_hooks, | |
1172 | struct xt_table_info *newinfo, unsigned int num_counters, | |
1173 | void __user *counters_ptr) | |
1174 | { | |
1175 | int ret; | |
1176 | struct ipt_table *t; | |
1177 | struct xt_table_info *oldinfo; | |
1178 | struct xt_counters *counters; | |
1179 | void *loc_cpu_old_entry; | |
1180 | ||
1181 | ret = 0; | |
1182 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); | |
1183 | if (!counters) { | |
1184 | ret = -ENOMEM; | |
1185 | goto out; | |
1186 | } | |
1187 | ||
1188 | t = try_then_request_module(xt_find_table_lock(AF_INET, name), | |
1189 | "iptable_%s", name); | |
1190 | if (!t || IS_ERR(t)) { | |
1191 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1192 | goto free_newinfo_counters_untrans; | |
1193 | } | |
1194 | ||
1195 | /* You lied! */ | |
1196 | if (valid_hooks != t->valid_hooks) { | |
1197 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1198 | valid_hooks, t->valid_hooks); | |
1199 | ret = -EINVAL; | |
1200 | goto put_module; | |
1201 | } | |
1202 | ||
1203 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1204 | if (!oldinfo) | |
1205 | goto put_module; | |
1206 | ||
1207 | /* Update module usage count based on number of rules */ | |
1208 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1209 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1210 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1211 | (newinfo->number <= oldinfo->initial_entries)) | |
1212 | module_put(t->me); | |
1213 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1214 | (newinfo->number <= oldinfo->initial_entries)) | |
1215 | module_put(t->me); | |
1216 | ||
1217 | /* Get the old counters. */ | |
1218 | get_counters(oldinfo, counters); | |
1219 | /* Decrease module usage counts and free resource */ | |
1220 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
1221 | IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL); | |
1222 | xt_free_table_info(oldinfo); | |
1223 | if (copy_to_user(counters_ptr, counters, | |
1224 | sizeof(struct xt_counters) * num_counters) != 0) | |
1225 | ret = -EFAULT; | |
1226 | vfree(counters); | |
1227 | xt_table_unlock(t); | |
1228 | return ret; | |
1229 | ||
1230 | put_module: | |
1231 | module_put(t->me); | |
1232 | xt_table_unlock(t); | |
1233 | free_newinfo_counters_untrans: | |
1234 | vfree(counters); | |
1235 | out: | |
1236 | return ret; | |
1237 | } | |
1238 | ||
1239 | static int | |
1240 | do_replace(void __user *user, unsigned int len) | |
1241 | { | |
1242 | int ret; | |
1243 | struct ipt_replace tmp; | |
1244 | struct xt_table_info *newinfo; | |
1245 | void *loc_cpu_entry; | |
1246 | ||
1247 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1248 | return -EFAULT; | |
1249 | ||
1250 | /* Hack: Causes ipchains to give correct error msg --RR */ | |
1251 | if (len != sizeof(tmp) + tmp.size) | |
1252 | return -ENOPROTOOPT; | |
1253 | ||
1254 | /* overflow check */ | |
1255 | if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS - | |
1256 | SMP_CACHE_BYTES) | |
1257 | return -ENOMEM; | |
1258 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1259 | return -ENOMEM; | |
1260 | ||
1261 | newinfo = xt_alloc_table_info(tmp.size); | |
1262 | if (!newinfo) | |
1263 | return -ENOMEM; | |
1264 | ||
1265 | /* choose the copy that is our node/cpu */ | |
1266 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1267 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1268 | tmp.size) != 0) { | |
1269 | ret = -EFAULT; | |
1270 | goto free_newinfo; | |
1271 | } | |
1272 | ||
1273 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
1274 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, | |
1275 | tmp.hook_entry, tmp.underflow); | |
1276 | if (ret != 0) | |
1277 | goto free_newinfo; | |
1278 | ||
1279 | duprintf("ip_tables: Translated table\n"); | |
1280 | ||
1281 | ret = __do_replace(tmp.name, tmp.valid_hooks, | |
1282 | newinfo, tmp.num_counters, | |
1283 | tmp.counters); | |
1284 | if (ret) | |
1285 | goto free_newinfo_untrans; | |
1286 | return 0; | |
1287 | ||
1288 | free_newinfo_untrans: | |
1289 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL); | |
1290 | free_newinfo: | |
1291 | xt_free_table_info(newinfo); | |
1292 | return ret; | |
1293 | } | |
1294 | ||
1295 | /* We're lazy, and add to the first CPU; overflow works its fey magic | |
1296 | * and everything is OK. */ | |
1297 | static inline int | |
1298 | add_counter_to_entry(struct ipt_entry *e, | |
1299 | const struct xt_counters addme[], | |
1300 | unsigned int *i) | |
1301 | { | |
1302 | #if 0 | |
1303 | duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n", | |
1304 | *i, | |
1305 | (long unsigned int)e->counters.pcnt, | |
1306 | (long unsigned int)e->counters.bcnt, | |
1307 | (long unsigned int)addme[*i].pcnt, | |
1308 | (long unsigned int)addme[*i].bcnt); | |
1309 | #endif | |
1310 | ||
1311 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1312 | ||
1313 | (*i)++; | |
1314 | return 0; | |
1315 | } | |
1316 | ||
1317 | static int | |
1318 | do_add_counters(void __user *user, unsigned int len, int compat) | |
1319 | { | |
1320 | unsigned int i; | |
1321 | struct xt_counters_info tmp; | |
1322 | struct xt_counters *paddc; | |
1323 | unsigned int num_counters; | |
1324 | char *name; | |
1325 | int size; | |
1326 | void *ptmp; | |
1327 | struct ipt_table *t; | |
1328 | struct xt_table_info *private; | |
1329 | int ret = 0; | |
1330 | void *loc_cpu_entry; | |
1331 | #ifdef CONFIG_COMPAT | |
1332 | struct compat_xt_counters_info compat_tmp; | |
1333 | ||
1334 | if (compat) { | |
1335 | ptmp = &compat_tmp; | |
1336 | size = sizeof(struct compat_xt_counters_info); | |
1337 | } else | |
1338 | #endif | |
1339 | { | |
1340 | ptmp = &tmp; | |
1341 | size = sizeof(struct xt_counters_info); | |
1342 | } | |
1343 | ||
1344 | if (copy_from_user(ptmp, user, size) != 0) | |
1345 | return -EFAULT; | |
1346 | ||
1347 | #ifdef CONFIG_COMPAT | |
1348 | if (compat) { | |
1349 | num_counters = compat_tmp.num_counters; | |
1350 | name = compat_tmp.name; | |
1351 | } else | |
1352 | #endif | |
1353 | { | |
1354 | num_counters = tmp.num_counters; | |
1355 | name = tmp.name; | |
1356 | } | |
1357 | ||
1358 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1359 | return -EINVAL; | |
1360 | ||
1361 | paddc = vmalloc_node(len - size, numa_node_id()); | |
1362 | if (!paddc) | |
1363 | return -ENOMEM; | |
1364 | ||
1365 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1366 | ret = -EFAULT; | |
1367 | goto free; | |
1368 | } | |
1369 | ||
1370 | t = xt_find_table_lock(AF_INET, name); | |
1371 | if (!t || IS_ERR(t)) { | |
1372 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1373 | goto free; | |
1374 | } | |
1375 | ||
1376 | write_lock_bh(&t->lock); | |
1377 | private = t->private; | |
1378 | if (private->number != num_counters) { | |
1379 | ret = -EINVAL; | |
1380 | goto unlock_up_free; | |
1381 | } | |
1382 | ||
1383 | i = 0; | |
1384 | /* Choose the copy that is on our node */ | |
1385 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1386 | IPT_ENTRY_ITERATE(loc_cpu_entry, | |
1387 | private->size, | |
1388 | add_counter_to_entry, | |
1389 | paddc, | |
1390 | &i); | |
1391 | unlock_up_free: | |
1392 | write_unlock_bh(&t->lock); | |
1393 | xt_table_unlock(t); | |
1394 | module_put(t->me); | |
1395 | free: | |
1396 | vfree(paddc); | |
1397 | ||
1398 | return ret; | |
1399 | } | |
1400 | ||
1401 | #ifdef CONFIG_COMPAT | |
1402 | struct compat_ipt_replace { | |
1403 | char name[IPT_TABLE_MAXNAMELEN]; | |
1404 | u32 valid_hooks; | |
1405 | u32 num_entries; | |
1406 | u32 size; | |
1407 | u32 hook_entry[NF_IP_NUMHOOKS]; | |
1408 | u32 underflow[NF_IP_NUMHOOKS]; | |
1409 | u32 num_counters; | |
1410 | compat_uptr_t counters; /* struct ipt_counters * */ | |
1411 | struct compat_ipt_entry entries[0]; | |
1412 | }; | |
1413 | ||
1414 | static inline int compat_copy_match_to_user(struct ipt_entry_match *m, | |
1415 | void __user **dstptr, compat_uint_t *size) | |
1416 | { | |
1417 | if (m->u.kernel.match->compat) | |
1418 | return m->u.kernel.match->compat(m, dstptr, size, | |
1419 | COMPAT_TO_USER); | |
1420 | else | |
1421 | return xt_compat_match(m, dstptr, size, COMPAT_TO_USER); | |
1422 | } | |
1423 | ||
1424 | static int compat_copy_entry_to_user(struct ipt_entry *e, | |
1425 | void __user **dstptr, compat_uint_t *size) | |
1426 | { | |
1427 | struct ipt_entry_target __user *t; | |
1428 | struct compat_ipt_entry __user *ce; | |
1429 | u_int16_t target_offset, next_offset; | |
1430 | compat_uint_t origsize; | |
1431 | int ret; | |
1432 | ||
1433 | ret = -EFAULT; | |
1434 | origsize = *size; | |
1435 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
7800007c | 1436 | if (copy_to_user(ce, e, sizeof(struct ipt_entry))) |
2722971c DM |
1437 | goto out; |
1438 | ||
1439 | *dstptr += sizeof(struct compat_ipt_entry); | |
1440 | ret = IPT_MATCH_ITERATE(e, compat_copy_match_to_user, dstptr, size); | |
1441 | target_offset = e->target_offset - (origsize - *size); | |
1442 | if (ret) | |
1443 | goto out; | |
1444 | t = ipt_get_target(e); | |
1445 | if (t->u.kernel.target->compat) | |
1446 | ret = t->u.kernel.target->compat(t, dstptr, size, | |
1447 | COMPAT_TO_USER); | |
1448 | else | |
1449 | ret = xt_compat_target(t, dstptr, size, COMPAT_TO_USER); | |
1450 | if (ret) | |
1451 | goto out; | |
1452 | ret = -EFAULT; | |
1453 | next_offset = e->next_offset - (origsize - *size); | |
7800007c | 1454 | if (put_user(target_offset, &ce->target_offset)) |
2722971c | 1455 | goto out; |
7800007c | 1456 | if (put_user(next_offset, &ce->next_offset)) |
2722971c DM |
1457 | goto out; |
1458 | return 0; | |
1459 | out: | |
1460 | return ret; | |
1461 | } | |
1462 | ||
1463 | static inline int | |
1464 | compat_check_calc_match(struct ipt_entry_match *m, | |
1465 | const char *name, | |
1466 | const struct ipt_ip *ip, | |
1467 | unsigned int hookmask, | |
1468 | int *size, int *i) | |
1469 | { | |
1470 | struct ipt_match *match; | |
1471 | ||
1472 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, | |
1473 | m->u.user.revision), | |
1474 | "ipt_%s", m->u.user.name); | |
1475 | if (IS_ERR(match) || !match) { | |
1476 | duprintf("compat_check_calc_match: `%s' not found\n", | |
1477 | m->u.user.name); | |
1478 | return match ? PTR_ERR(match) : -ENOENT; | |
1479 | } | |
1480 | m->u.kernel.match = match; | |
1481 | ||
1482 | if (m->u.kernel.match->compat) | |
1483 | m->u.kernel.match->compat(m, NULL, size, COMPAT_CALC_SIZE); | |
1484 | else | |
1485 | xt_compat_match(m, NULL, size, COMPAT_CALC_SIZE); | |
1486 | ||
1487 | (*i)++; | |
1488 | return 0; | |
1489 | } | |
1490 | ||
1491 | static inline int | |
1492 | check_compat_entry_size_and_hooks(struct ipt_entry *e, | |
1493 | struct xt_table_info *newinfo, | |
1494 | unsigned int *size, | |
1495 | unsigned char *base, | |
1496 | unsigned char *limit, | |
1497 | unsigned int *hook_entries, | |
1498 | unsigned int *underflows, | |
1499 | unsigned int *i, | |
1500 | const char *name) | |
1501 | { | |
1502 | struct ipt_entry_target *t; | |
1503 | struct ipt_target *target; | |
1504 | u_int16_t entry_offset; | |
1505 | int ret, off, h, j; | |
1506 | ||
1507 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
1508 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 | |
1509 | || (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { | |
1510 | duprintf("Bad offset %p, limit = %p\n", e, limit); | |
1511 | return -EINVAL; | |
1512 | } | |
1513 | ||
1514 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
1515 | sizeof(struct compat_xt_entry_target)) { | |
1516 | duprintf("checking: element %p size %u\n", | |
1517 | e, e->next_offset); | |
1518 | return -EINVAL; | |
1519 | } | |
1520 | ||
1521 | if (!ip_checkentry(&e->ip)) { | |
1522 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
1523 | return -EINVAL; | |
1524 | } | |
1525 | ||
1526 | off = 0; | |
1527 | entry_offset = (void *)e - (void *)base; | |
1528 | j = 0; | |
1529 | ret = IPT_MATCH_ITERATE(e, compat_check_calc_match, name, &e->ip, | |
1530 | e->comefrom, &off, &j); | |
1531 | if (ret != 0) | |
bec71b16 | 1532 | goto cleanup_matches; |
2722971c DM |
1533 | |
1534 | t = ipt_get_target(e); | |
1535 | target = try_then_request_module(xt_find_target(AF_INET, | |
1536 | t->u.user.name, | |
1537 | t->u.user.revision), | |
1538 | "ipt_%s", t->u.user.name); | |
1539 | if (IS_ERR(target) || !target) { | |
1540 | duprintf("check_entry: `%s' not found\n", t->u.user.name); | |
1541 | ret = target ? PTR_ERR(target) : -ENOENT; | |
bec71b16 | 1542 | goto cleanup_matches; |
2722971c DM |
1543 | } |
1544 | t->u.kernel.target = target; | |
1545 | ||
1546 | if (t->u.kernel.target->compat) | |
1547 | t->u.kernel.target->compat(t, NULL, &off, COMPAT_CALC_SIZE); | |
1548 | else | |
1549 | xt_compat_target(t, NULL, &off, COMPAT_CALC_SIZE); | |
1550 | *size += off; | |
1551 | ret = compat_add_offset(entry_offset, off); | |
1552 | if (ret) | |
1553 | goto out; | |
1554 | ||
1555 | /* Check hooks & underflows */ | |
1556 | for (h = 0; h < NF_IP_NUMHOOKS; h++) { | |
1557 | if ((unsigned char *)e - base == hook_entries[h]) | |
1558 | newinfo->hook_entry[h] = hook_entries[h]; | |
1559 | if ((unsigned char *)e - base == underflows[h]) | |
1560 | newinfo->underflow[h] = underflows[h]; | |
1561 | } | |
1562 | ||
1563 | /* Clear counters and comefrom */ | |
1564 | e->counters = ((struct ipt_counters) { 0, 0 }); | |
1565 | e->comefrom = 0; | |
1566 | ||
1567 | (*i)++; | |
1568 | return 0; | |
bec71b16 | 1569 | |
2722971c | 1570 | out: |
bec71b16 PM |
1571 | module_put(t->u.kernel.target->me); |
1572 | cleanup_matches: | |
2722971c DM |
1573 | IPT_MATCH_ITERATE(e, cleanup_match, &j); |
1574 | return ret; | |
1575 | } | |
1576 | ||
1577 | static inline int compat_copy_match_from_user(struct ipt_entry_match *m, | |
1578 | void **dstptr, compat_uint_t *size, const char *name, | |
bec71b16 | 1579 | const struct ipt_ip *ip, unsigned int hookmask, int *i) |
2722971c DM |
1580 | { |
1581 | struct ipt_entry_match *dm; | |
1582 | struct ipt_match *match; | |
1583 | int ret; | |
1584 | ||
1585 | dm = (struct ipt_entry_match *)*dstptr; | |
1586 | match = m->u.kernel.match; | |
1587 | if (match->compat) | |
1588 | match->compat(m, dstptr, size, COMPAT_FROM_USER); | |
1589 | else | |
1590 | xt_compat_match(m, dstptr, size, COMPAT_FROM_USER); | |
1591 | ||
1592 | ret = xt_check_match(match, AF_INET, dm->u.match_size - sizeof(*dm), | |
1593 | name, hookmask, ip->proto, | |
1594 | ip->invflags & IPT_INV_PROTO); | |
1595 | if (ret) | |
bec71b16 | 1596 | goto err; |
2722971c DM |
1597 | |
1598 | if (m->u.kernel.match->checkentry | |
1599 | && !m->u.kernel.match->checkentry(name, ip, match, dm->data, | |
2722971c DM |
1600 | hookmask)) { |
1601 | duprintf("ip_tables: check failed for `%s'.\n", | |
1602 | m->u.kernel.match->name); | |
bec71b16 PM |
1603 | ret = -EINVAL; |
1604 | goto err; | |
2722971c | 1605 | } |
bec71b16 | 1606 | (*i)++; |
2722971c | 1607 | return 0; |
bec71b16 PM |
1608 | |
1609 | err: | |
1610 | module_put(m->u.kernel.match->me); | |
1611 | return ret; | |
2722971c DM |
1612 | } |
1613 | ||
1614 | static int compat_copy_entry_from_user(struct ipt_entry *e, void **dstptr, | |
1615 | unsigned int *size, const char *name, | |
1616 | struct xt_table_info *newinfo, unsigned char *base) | |
1617 | { | |
1618 | struct ipt_entry_target *t; | |
1619 | struct ipt_target *target; | |
1620 | struct ipt_entry *de; | |
1621 | unsigned int origsize; | |
bec71b16 | 1622 | int ret, h, j; |
2722971c DM |
1623 | |
1624 | ret = 0; | |
1625 | origsize = *size; | |
1626 | de = (struct ipt_entry *)*dstptr; | |
1627 | memcpy(de, e, sizeof(struct ipt_entry)); | |
1628 | ||
bec71b16 | 1629 | j = 0; |
2722971c DM |
1630 | *dstptr += sizeof(struct compat_ipt_entry); |
1631 | ret = IPT_MATCH_ITERATE(e, compat_copy_match_from_user, dstptr, size, | |
bec71b16 | 1632 | name, &de->ip, de->comefrom, &j); |
2722971c | 1633 | if (ret) |
bec71b16 | 1634 | goto cleanup_matches; |
2722971c DM |
1635 | de->target_offset = e->target_offset - (origsize - *size); |
1636 | t = ipt_get_target(e); | |
1637 | target = t->u.kernel.target; | |
1638 | if (target->compat) | |
1639 | target->compat(t, dstptr, size, COMPAT_FROM_USER); | |
1640 | else | |
1641 | xt_compat_target(t, dstptr, size, COMPAT_FROM_USER); | |
1642 | ||
1643 | de->next_offset = e->next_offset - (origsize - *size); | |
1644 | for (h = 0; h < NF_IP_NUMHOOKS; h++) { | |
1645 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1646 | newinfo->hook_entry[h] -= origsize - *size; | |
1647 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1648 | newinfo->underflow[h] -= origsize - *size; | |
1649 | } | |
1650 | ||
1651 | t = ipt_get_target(de); | |
1652 | target = t->u.kernel.target; | |
1653 | ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t), | |
1654 | name, e->comefrom, e->ip.proto, | |
1655 | e->ip.invflags & IPT_INV_PROTO); | |
1656 | if (ret) | |
bec71b16 | 1657 | goto err; |
2722971c DM |
1658 | |
1659 | ret = -EINVAL; | |
1660 | if (t->u.kernel.target == &ipt_standard_target) { | |
1661 | if (!standard_check(t, *size)) | |
bec71b16 | 1662 | goto err; |
2722971c DM |
1663 | } else if (t->u.kernel.target->checkentry |
1664 | && !t->u.kernel.target->checkentry(name, de, target, | |
efa74165 | 1665 | t->data, de->comefrom)) { |
2722971c DM |
1666 | duprintf("ip_tables: compat: check failed for `%s'.\n", |
1667 | t->u.kernel.target->name); | |
bec71b16 | 1668 | goto err; |
2722971c DM |
1669 | } |
1670 | ret = 0; | |
bec71b16 PM |
1671 | return ret; |
1672 | ||
1673 | err: | |
1674 | module_put(t->u.kernel.target->me); | |
1675 | cleanup_matches: | |
1676 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
2722971c DM |
1677 | return ret; |
1678 | } | |
1679 | ||
1da177e4 | 1680 | static int |
2722971c DM |
1681 | translate_compat_table(const char *name, |
1682 | unsigned int valid_hooks, | |
1683 | struct xt_table_info **pinfo, | |
1684 | void **pentry0, | |
1685 | unsigned int total_size, | |
1686 | unsigned int number, | |
1687 | unsigned int *hook_entries, | |
1688 | unsigned int *underflows) | |
1da177e4 | 1689 | { |
2722971c DM |
1690 | unsigned int i; |
1691 | struct xt_table_info *newinfo, *info; | |
1692 | void *pos, *entry0, *entry1; | |
1693 | unsigned int size; | |
1da177e4 | 1694 | int ret; |
1da177e4 | 1695 | |
2722971c DM |
1696 | info = *pinfo; |
1697 | entry0 = *pentry0; | |
1698 | size = total_size; | |
1699 | info->number = number; | |
1700 | ||
1701 | /* Init all hooks to impossible value. */ | |
1702 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { | |
1703 | info->hook_entry[i] = 0xFFFFFFFF; | |
1704 | info->underflow[i] = 0xFFFFFFFF; | |
1705 | } | |
1706 | ||
1707 | duprintf("translate_compat_table: size %u\n", info->size); | |
1708 | i = 0; | |
1709 | xt_compat_lock(AF_INET); | |
1710 | /* Walk through entries, checking offsets. */ | |
1711 | ret = IPT_ENTRY_ITERATE(entry0, total_size, | |
1712 | check_compat_entry_size_and_hooks, | |
1713 | info, &size, entry0, | |
1714 | entry0 + total_size, | |
1715 | hook_entries, underflows, &i, name); | |
1716 | if (ret != 0) | |
1717 | goto out_unlock; | |
1718 | ||
1719 | ret = -EINVAL; | |
1720 | if (i != number) { | |
1721 | duprintf("translate_compat_table: %u not %u entries\n", | |
1722 | i, number); | |
1723 | goto out_unlock; | |
1724 | } | |
1725 | ||
1726 | /* Check hooks all assigned */ | |
1727 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { | |
1728 | /* Only hooks which are valid */ | |
1729 | if (!(valid_hooks & (1 << i))) | |
1730 | continue; | |
1731 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1732 | duprintf("Invalid hook entry %u %u\n", | |
1733 | i, hook_entries[i]); | |
1734 | goto out_unlock; | |
1da177e4 | 1735 | } |
2722971c DM |
1736 | if (info->underflow[i] == 0xFFFFFFFF) { |
1737 | duprintf("Invalid underflow %u %u\n", | |
1738 | i, underflows[i]); | |
1739 | goto out_unlock; | |
1740 | } | |
1741 | } | |
1742 | ||
1743 | ret = -ENOMEM; | |
1744 | newinfo = xt_alloc_table_info(size); | |
1745 | if (!newinfo) | |
1746 | goto out_unlock; | |
1747 | ||
1748 | newinfo->number = number; | |
1749 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { | |
1750 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1751 | newinfo->underflow[i] = info->underflow[i]; | |
1752 | } | |
1753 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1754 | pos = entry1; | |
1755 | size = total_size; | |
1756 | ret = IPT_ENTRY_ITERATE(entry0, total_size, | |
1757 | compat_copy_entry_from_user, &pos, &size, | |
1758 | name, newinfo, entry1); | |
1759 | compat_flush_offsets(); | |
1760 | xt_compat_unlock(AF_INET); | |
1761 | if (ret) | |
1762 | goto free_newinfo; | |
1763 | ||
1764 | ret = -ELOOP; | |
1765 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1766 | goto free_newinfo; | |
1767 | ||
1768 | /* And one copy for every other CPU */ | |
fb1bb34d | 1769 | for_each_possible_cpu(i) |
2722971c DM |
1770 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1771 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1772 | ||
1773 | *pinfo = newinfo; | |
1774 | *pentry0 = entry1; | |
1775 | xt_free_table_info(info); | |
1776 | return 0; | |
1da177e4 | 1777 | |
2722971c DM |
1778 | free_newinfo: |
1779 | xt_free_table_info(newinfo); | |
1780 | out: | |
1da177e4 | 1781 | return ret; |
2722971c DM |
1782 | out_unlock: |
1783 | xt_compat_unlock(AF_INET); | |
1784 | goto out; | |
1da177e4 LT |
1785 | } |
1786 | ||
1787 | static int | |
2722971c | 1788 | compat_do_replace(void __user *user, unsigned int len) |
1da177e4 LT |
1789 | { |
1790 | int ret; | |
2722971c DM |
1791 | struct compat_ipt_replace tmp; |
1792 | struct xt_table_info *newinfo; | |
1793 | void *loc_cpu_entry; | |
1da177e4 LT |
1794 | |
1795 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1796 | return -EFAULT; | |
1797 | ||
1798 | /* Hack: Causes ipchains to give correct error msg --RR */ | |
1799 | if (len != sizeof(tmp) + tmp.size) | |
1800 | return -ENOPROTOOPT; | |
1801 | ||
ee4bb818 KK |
1802 | /* overflow check */ |
1803 | if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS - | |
1804 | SMP_CACHE_BYTES) | |
1805 | return -ENOMEM; | |
1806 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1807 | return -ENOMEM; | |
1808 | ||
2e4e6a17 | 1809 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1810 | if (!newinfo) |
1811 | return -ENOMEM; | |
1812 | ||
31836064 ED |
1813 | /* choose the copy that is our node/cpu */ |
1814 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1815 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1816 | tmp.size) != 0) { |
1817 | ret = -EFAULT; | |
1818 | goto free_newinfo; | |
1819 | } | |
1820 | ||
2722971c DM |
1821 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, |
1822 | &newinfo, &loc_cpu_entry, tmp.size, | |
1823 | tmp.num_entries, tmp.hook_entry, tmp.underflow); | |
1824 | if (ret != 0) | |
1da177e4 | 1825 | goto free_newinfo; |
1da177e4 | 1826 | |
2722971c | 1827 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1828 | |
2722971c DM |
1829 | ret = __do_replace(tmp.name, tmp.valid_hooks, |
1830 | newinfo, tmp.num_counters, | |
1831 | compat_ptr(tmp.counters)); | |
1832 | if (ret) | |
1833 | goto free_newinfo_untrans; | |
1834 | return 0; | |
1da177e4 | 1835 | |
2722971c DM |
1836 | free_newinfo_untrans: |
1837 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL); | |
1838 | free_newinfo: | |
1839 | xt_free_table_info(newinfo); | |
1840 | return ret; | |
1841 | } | |
1da177e4 | 1842 | |
2722971c DM |
1843 | static int |
1844 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1845 | unsigned int len) | |
1846 | { | |
1847 | int ret; | |
1da177e4 | 1848 | |
2722971c DM |
1849 | if (!capable(CAP_NET_ADMIN)) |
1850 | return -EPERM; | |
1da177e4 | 1851 | |
2722971c DM |
1852 | switch (cmd) { |
1853 | case IPT_SO_SET_REPLACE: | |
1854 | ret = compat_do_replace(user, len); | |
1855 | break; | |
1da177e4 | 1856 | |
2722971c DM |
1857 | case IPT_SO_SET_ADD_COUNTERS: |
1858 | ret = do_add_counters(user, len, 1); | |
1859 | break; | |
1860 | ||
1861 | default: | |
1862 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1863 | ret = -EINVAL; | |
1864 | } | |
1da177e4 | 1865 | |
1da177e4 LT |
1866 | return ret; |
1867 | } | |
1868 | ||
2722971c | 1869 | struct compat_ipt_get_entries |
1da177e4 | 1870 | { |
2722971c DM |
1871 | char name[IPT_TABLE_MAXNAMELEN]; |
1872 | compat_uint_t size; | |
1873 | struct compat_ipt_entry entrytable[0]; | |
1874 | }; | |
1da177e4 | 1875 | |
2722971c DM |
1876 | static int compat_copy_entries_to_user(unsigned int total_size, |
1877 | struct ipt_table *table, void __user *userptr) | |
1878 | { | |
1879 | unsigned int off, num; | |
1880 | struct compat_ipt_entry e; | |
1881 | struct xt_counters *counters; | |
1882 | struct xt_table_info *private = table->private; | |
1883 | void __user *pos; | |
1884 | unsigned int size; | |
1885 | int ret = 0; | |
1886 | void *loc_cpu_entry; | |
1da177e4 | 1887 | |
2722971c DM |
1888 | counters = alloc_counters(table); |
1889 | if (IS_ERR(counters)) | |
1890 | return PTR_ERR(counters); | |
1891 | ||
1892 | /* choose the copy that is on our node/cpu, ... | |
1893 | * This choice is lazy (because current thread is | |
1894 | * allowed to migrate to another cpu) | |
1895 | */ | |
1896 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1897 | pos = userptr; | |
1898 | size = total_size; | |
1899 | ret = IPT_ENTRY_ITERATE(loc_cpu_entry, total_size, | |
1900 | compat_copy_entry_to_user, &pos, &size); | |
1901 | if (ret) | |
1902 | goto free_counters; | |
1903 | ||
1904 | /* ... then go back and fix counters and names */ | |
1905 | for (off = 0, num = 0; off < size; off += e.next_offset, num++) { | |
1906 | unsigned int i; | |
1907 | struct ipt_entry_match m; | |
1908 | struct ipt_entry_target t; | |
1909 | ||
1910 | ret = -EFAULT; | |
1911 | if (copy_from_user(&e, userptr + off, | |
1912 | sizeof(struct compat_ipt_entry))) | |
1913 | goto free_counters; | |
1914 | if (copy_to_user(userptr + off + | |
1915 | offsetof(struct compat_ipt_entry, counters), | |
1916 | &counters[num], sizeof(counters[num]))) | |
1917 | goto free_counters; | |
1918 | ||
1919 | for (i = sizeof(struct compat_ipt_entry); | |
1920 | i < e.target_offset; i += m.u.match_size) { | |
1921 | if (copy_from_user(&m, userptr + off + i, | |
1922 | sizeof(struct ipt_entry_match))) | |
1923 | goto free_counters; | |
1924 | if (copy_to_user(userptr + off + i + | |
1925 | offsetof(struct ipt_entry_match, u.user.name), | |
1926 | m.u.kernel.match->name, | |
1927 | strlen(m.u.kernel.match->name) + 1)) | |
1928 | goto free_counters; | |
1929 | } | |
1930 | ||
1931 | if (copy_from_user(&t, userptr + off + e.target_offset, | |
1932 | sizeof(struct ipt_entry_target))) | |
1933 | goto free_counters; | |
1934 | if (copy_to_user(userptr + off + e.target_offset + | |
1935 | offsetof(struct ipt_entry_target, u.user.name), | |
1936 | t.u.kernel.target->name, | |
1937 | strlen(t.u.kernel.target->name) + 1)) | |
1938 | goto free_counters; | |
1939 | } | |
1940 | ret = 0; | |
1941 | free_counters: | |
1942 | vfree(counters); | |
1943 | return ret; | |
1da177e4 LT |
1944 | } |
1945 | ||
1946 | static int | |
2722971c | 1947 | compat_get_entries(struct compat_ipt_get_entries __user *uptr, int *len) |
1da177e4 | 1948 | { |
2722971c DM |
1949 | int ret; |
1950 | struct compat_ipt_get_entries get; | |
1da177e4 | 1951 | struct ipt_table *t; |
1da177e4 | 1952 | |
1da177e4 | 1953 | |
2722971c DM |
1954 | if (*len < sizeof(get)) { |
1955 | duprintf("compat_get_entries: %u < %u\n", | |
1956 | *len, (unsigned int)sizeof(get)); | |
1da177e4 | 1957 | return -EINVAL; |
2722971c | 1958 | } |
1da177e4 | 1959 | |
2722971c DM |
1960 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1961 | return -EFAULT; | |
1da177e4 | 1962 | |
2722971c DM |
1963 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
1964 | duprintf("compat_get_entries: %u != %u\n", *len, | |
1965 | (unsigned int)(sizeof(struct compat_ipt_get_entries) + | |
1966 | get.size)); | |
1967 | return -EINVAL; | |
1da177e4 LT |
1968 | } |
1969 | ||
2722971c DM |
1970 | xt_compat_lock(AF_INET); |
1971 | t = xt_find_table_lock(AF_INET, get.name); | |
1972 | if (t && !IS_ERR(t)) { | |
1973 | struct xt_table_info *private = t->private; | |
1974 | struct xt_table_info info; | |
1975 | duprintf("t->private->number = %u\n", | |
1976 | private->number); | |
1977 | ret = compat_table_info(private, &info); | |
1978 | if (!ret && get.size == info.size) { | |
1979 | ret = compat_copy_entries_to_user(private->size, | |
1980 | t, uptr->entrytable); | |
1981 | } else if (!ret) { | |
1982 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
1983 | private->size, | |
1984 | get.size); | |
1985 | ret = -EINVAL; | |
1986 | } | |
1987 | compat_flush_offsets(); | |
1988 | module_put(t->me); | |
1989 | xt_table_unlock(t); | |
1990 | } else | |
1da177e4 | 1991 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1992 | |
2722971c DM |
1993 | xt_compat_unlock(AF_INET); |
1994 | return ret; | |
1995 | } | |
1da177e4 | 1996 | |
79030ed0 PM |
1997 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1998 | ||
2722971c DM |
1999 | static int |
2000 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2001 | { | |
2002 | int ret; | |
1da177e4 | 2003 | |
2722971c DM |
2004 | switch (cmd) { |
2005 | case IPT_SO_GET_INFO: | |
2006 | ret = get_info(user, len, 1); | |
2007 | break; | |
2008 | case IPT_SO_GET_ENTRIES: | |
2009 | ret = compat_get_entries(user, len); | |
2010 | break; | |
2011 | default: | |
79030ed0 | 2012 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 2013 | } |
1da177e4 LT |
2014 | return ret; |
2015 | } | |
2722971c | 2016 | #endif |
1da177e4 LT |
2017 | |
2018 | static int | |
2019 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2020 | { | |
2021 | int ret; | |
2022 | ||
2023 | if (!capable(CAP_NET_ADMIN)) | |
2024 | return -EPERM; | |
2025 | ||
2026 | switch (cmd) { | |
2027 | case IPT_SO_SET_REPLACE: | |
2028 | ret = do_replace(user, len); | |
2029 | break; | |
2030 | ||
2031 | case IPT_SO_SET_ADD_COUNTERS: | |
2722971c | 2032 | ret = do_add_counters(user, len, 0); |
1da177e4 LT |
2033 | break; |
2034 | ||
2035 | default: | |
2036 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
2037 | ret = -EINVAL; | |
2038 | } | |
2039 | ||
2040 | return ret; | |
2041 | } | |
2042 | ||
2043 | static int | |
2044 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2045 | { | |
2046 | int ret; | |
2047 | ||
2048 | if (!capable(CAP_NET_ADMIN)) | |
2049 | return -EPERM; | |
2050 | ||
2051 | switch (cmd) { | |
2722971c DM |
2052 | case IPT_SO_GET_INFO: |
2053 | ret = get_info(user, len, 0); | |
2054 | break; | |
1da177e4 | 2055 | |
2722971c DM |
2056 | case IPT_SO_GET_ENTRIES: |
2057 | ret = get_entries(user, len); | |
1da177e4 | 2058 | break; |
1da177e4 LT |
2059 | |
2060 | case IPT_SO_GET_REVISION_MATCH: | |
2061 | case IPT_SO_GET_REVISION_TARGET: { | |
2062 | struct ipt_get_revision rev; | |
2e4e6a17 | 2063 | int target; |
1da177e4 LT |
2064 | |
2065 | if (*len != sizeof(rev)) { | |
2066 | ret = -EINVAL; | |
2067 | break; | |
2068 | } | |
2069 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2070 | ret = -EFAULT; | |
2071 | break; | |
2072 | } | |
2073 | ||
2074 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2075 | target = 1; |
1da177e4 | 2076 | else |
2e4e6a17 | 2077 | target = 0; |
1da177e4 | 2078 | |
2e4e6a17 HW |
2079 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2080 | rev.revision, | |
2081 | target, &ret), | |
1da177e4 LT |
2082 | "ipt_%s", rev.name); |
2083 | break; | |
2084 | } | |
2085 | ||
2086 | default: | |
2087 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2088 | ret = -EINVAL; | |
2089 | } | |
2090 | ||
2091 | return ret; | |
2092 | } | |
2093 | ||
2e4e6a17 | 2094 | int ipt_register_table(struct xt_table *table, const struct ipt_replace *repl) |
1da177e4 LT |
2095 | { |
2096 | int ret; | |
2e4e6a17 HW |
2097 | struct xt_table_info *newinfo; |
2098 | static struct xt_table_info bootstrap | |
1da177e4 | 2099 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2100 | void *loc_cpu_entry; |
1da177e4 | 2101 | |
2e4e6a17 | 2102 | newinfo = xt_alloc_table_info(repl->size); |
1da177e4 LT |
2103 | if (!newinfo) |
2104 | return -ENOMEM; | |
2105 | ||
31836064 ED |
2106 | /* choose the copy on our node/cpu |
2107 | * but dont care of preemption | |
2108 | */ | |
2109 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
2110 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
2111 | |
2112 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 2113 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
2114 | repl->num_entries, |
2115 | repl->hook_entry, | |
2116 | repl->underflow); | |
2117 | if (ret != 0) { | |
2e4e6a17 | 2118 | xt_free_table_info(newinfo); |
1da177e4 LT |
2119 | return ret; |
2120 | } | |
2121 | ||
da298d3a PM |
2122 | ret = xt_register_table(table, &bootstrap, newinfo); |
2123 | if (ret != 0) { | |
2e4e6a17 | 2124 | xt_free_table_info(newinfo); |
1da177e4 LT |
2125 | return ret; |
2126 | } | |
2127 | ||
2e4e6a17 | 2128 | return 0; |
1da177e4 LT |
2129 | } |
2130 | ||
2131 | void ipt_unregister_table(struct ipt_table *table) | |
2132 | { | |
2e4e6a17 | 2133 | struct xt_table_info *private; |
31836064 ED |
2134 | void *loc_cpu_entry; |
2135 | ||
2e4e6a17 | 2136 | private = xt_unregister_table(table); |
1da177e4 LT |
2137 | |
2138 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
2139 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
2140 | IPT_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
2141 | xt_free_table_info(private); | |
1da177e4 LT |
2142 | } |
2143 | ||
2144 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
2145 | static inline int | |
2146 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, | |
2147 | u_int8_t type, u_int8_t code, | |
2148 | int invert) | |
2149 | { | |
2150 | return ((test_type == 0xFF) || (type == test_type && code >= min_code && code <= max_code)) | |
2151 | ^ invert; | |
2152 | } | |
2153 | ||
2154 | static int | |
2155 | icmp_match(const struct sk_buff *skb, | |
2156 | const struct net_device *in, | |
2157 | const struct net_device *out, | |
c4986734 | 2158 | const struct xt_match *match, |
1da177e4 LT |
2159 | const void *matchinfo, |
2160 | int offset, | |
2e4e6a17 | 2161 | unsigned int protoff, |
1da177e4 LT |
2162 | int *hotdrop) |
2163 | { | |
2164 | struct icmphdr _icmph, *ic; | |
2165 | const struct ipt_icmp *icmpinfo = matchinfo; | |
2166 | ||
2167 | /* Must not be a fragment. */ | |
2168 | if (offset) | |
2169 | return 0; | |
2170 | ||
2e4e6a17 | 2171 | ic = skb_header_pointer(skb, protoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2172 | if (ic == NULL) { |
2173 | /* We've been asked to examine this packet, and we | |
2174 | * can't. Hence, no choice but to drop. | |
2175 | */ | |
2176 | duprintf("Dropping evil ICMP tinygram.\n"); | |
2177 | *hotdrop = 1; | |
2178 | return 0; | |
2179 | } | |
2180 | ||
2181 | return icmp_type_code_match(icmpinfo->type, | |
2182 | icmpinfo->code[0], | |
2183 | icmpinfo->code[1], | |
2184 | ic->type, ic->code, | |
2185 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2186 | } | |
2187 | ||
2188 | /* Called when user tries to insert an entry of this type. */ | |
2189 | static int | |
2190 | icmp_checkentry(const char *tablename, | |
2e4e6a17 | 2191 | const void *info, |
c4986734 | 2192 | const struct xt_match *match, |
1da177e4 | 2193 | void *matchinfo, |
1da177e4 LT |
2194 | unsigned int hook_mask) |
2195 | { | |
2196 | const struct ipt_icmp *icmpinfo = matchinfo; | |
2197 | ||
1d5cd909 PM |
2198 | /* Must specify no unknown invflags */ |
2199 | return !(icmpinfo->invflags & ~IPT_ICMP_INV); | |
1da177e4 LT |
2200 | } |
2201 | ||
2202 | /* The built-in targets: standard (NULL) and error. */ | |
2203 | static struct ipt_target ipt_standard_target = { | |
2204 | .name = IPT_STANDARD_TARGET, | |
1d5cd909 | 2205 | .targetsize = sizeof(int), |
a45049c5 | 2206 | .family = AF_INET, |
2722971c DM |
2207 | #ifdef CONFIG_COMPAT |
2208 | .compat = &compat_ipt_standard_fn, | |
2209 | #endif | |
1da177e4 LT |
2210 | }; |
2211 | ||
2212 | static struct ipt_target ipt_error_target = { | |
2213 | .name = IPT_ERROR_TARGET, | |
2214 | .target = ipt_error, | |
1d5cd909 | 2215 | .targetsize = IPT_FUNCTION_MAXNAMELEN, |
a45049c5 | 2216 | .family = AF_INET, |
1da177e4 LT |
2217 | }; |
2218 | ||
2219 | static struct nf_sockopt_ops ipt_sockopts = { | |
2220 | .pf = PF_INET, | |
2221 | .set_optmin = IPT_BASE_CTL, | |
2222 | .set_optmax = IPT_SO_SET_MAX+1, | |
2223 | .set = do_ipt_set_ctl, | |
2722971c DM |
2224 | #ifdef CONFIG_COMPAT |
2225 | .compat_set = compat_do_ipt_set_ctl, | |
2226 | #endif | |
1da177e4 LT |
2227 | .get_optmin = IPT_BASE_CTL, |
2228 | .get_optmax = IPT_SO_GET_MAX+1, | |
2229 | .get = do_ipt_get_ctl, | |
2722971c DM |
2230 | #ifdef CONFIG_COMPAT |
2231 | .compat_get = compat_do_ipt_get_ctl, | |
2232 | #endif | |
1da177e4 LT |
2233 | }; |
2234 | ||
1da177e4 LT |
2235 | static struct ipt_match icmp_matchstruct = { |
2236 | .name = "icmp", | |
1d5cd909 PM |
2237 | .match = icmp_match, |
2238 | .matchsize = sizeof(struct ipt_icmp), | |
2239 | .proto = IPPROTO_ICMP, | |
a45049c5 | 2240 | .family = AF_INET, |
1d5cd909 | 2241 | .checkentry = icmp_checkentry, |
1da177e4 LT |
2242 | }; |
2243 | ||
65b4b4e8 | 2244 | static int __init ip_tables_init(void) |
1da177e4 LT |
2245 | { |
2246 | int ret; | |
2247 | ||
0eff66e6 PM |
2248 | ret = xt_proto_init(AF_INET); |
2249 | if (ret < 0) | |
2250 | goto err1; | |
2e4e6a17 | 2251 | |
1da177e4 | 2252 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2253 | ret = xt_register_target(&ipt_standard_target); |
2254 | if (ret < 0) | |
2255 | goto err2; | |
2256 | ret = xt_register_target(&ipt_error_target); | |
2257 | if (ret < 0) | |
2258 | goto err3; | |
2259 | ret = xt_register_match(&icmp_matchstruct); | |
2260 | if (ret < 0) | |
2261 | goto err4; | |
1da177e4 LT |
2262 | |
2263 | /* Register setsockopt */ | |
2264 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2265 | if (ret < 0) |
2266 | goto err5; | |
1da177e4 | 2267 | |
2e4e6a17 | 2268 | printk("ip_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2269 | return 0; |
0eff66e6 PM |
2270 | |
2271 | err5: | |
2272 | xt_unregister_match(&icmp_matchstruct); | |
2273 | err4: | |
2274 | xt_unregister_target(&ipt_error_target); | |
2275 | err3: | |
2276 | xt_unregister_target(&ipt_standard_target); | |
2277 | err2: | |
2278 | xt_proto_fini(AF_INET); | |
2279 | err1: | |
2280 | return ret; | |
1da177e4 LT |
2281 | } |
2282 | ||
65b4b4e8 | 2283 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2284 | { |
2285 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2286 | |
a45049c5 PNA |
2287 | xt_unregister_match(&icmp_matchstruct); |
2288 | xt_unregister_target(&ipt_error_target); | |
2289 | xt_unregister_target(&ipt_standard_target); | |
2e4e6a17 HW |
2290 | |
2291 | xt_proto_fini(AF_INET); | |
1da177e4 LT |
2292 | } |
2293 | ||
2294 | EXPORT_SYMBOL(ipt_register_table); | |
2295 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2296 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2297 | module_init(ip_tables_init); |
2298 | module_exit(ip_tables_fini); |