Commit | Line | Data |
---|---|---|
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 | ||
590bdf7f DM |
550 | if (e->target_offset + sizeof(struct ipt_entry_target) > e->next_offset) |
551 | return -EINVAL; | |
552 | ||
1da177e4 LT |
553 | j = 0; |
554 | ret = IPT_MATCH_ITERATE(e, check_match, name, &e->ip, e->comefrom, &j); | |
555 | if (ret != 0) | |
556 | goto cleanup_matches; | |
557 | ||
558 | t = ipt_get_target(e); | |
590bdf7f DM |
559 | ret = -EINVAL; |
560 | if (e->target_offset + t->u.target_size > e->next_offset) | |
561 | goto cleanup_matches; | |
2e4e6a17 HW |
562 | target = try_then_request_module(xt_find_target(AF_INET, |
563 | t->u.user.name, | |
1da177e4 LT |
564 | t->u.user.revision), |
565 | "ipt_%s", t->u.user.name); | |
566 | if (IS_ERR(target) || !target) { | |
567 | duprintf("check_entry: `%s' not found\n", t->u.user.name); | |
568 | ret = target ? PTR_ERR(target) : -ENOENT; | |
569 | goto cleanup_matches; | |
570 | } | |
571 | t->u.kernel.target = target; | |
572 | ||
3cdc7c95 PM |
573 | ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t), |
574 | name, e->comefrom, e->ip.proto, | |
575 | e->ip.invflags & IPT_INV_PROTO); | |
576 | if (ret) | |
577 | goto err; | |
578 | ||
1da177e4 LT |
579 | if (t->u.kernel.target == &ipt_standard_target) { |
580 | if (!standard_check(t, size)) { | |
581 | ret = -EINVAL; | |
90d47db4 | 582 | goto err; |
1da177e4 LT |
583 | } |
584 | } else if (t->u.kernel.target->checkentry | |
1c524830 | 585 | && !t->u.kernel.target->checkentry(name, e, target, t->data, |
1da177e4 | 586 | e->comefrom)) { |
1da177e4 LT |
587 | duprintf("ip_tables: check failed for `%s'.\n", |
588 | t->u.kernel.target->name); | |
589 | ret = -EINVAL; | |
3cdc7c95 | 590 | goto err; |
1da177e4 LT |
591 | } |
592 | ||
593 | (*i)++; | |
594 | return 0; | |
3cdc7c95 PM |
595 | err: |
596 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
597 | cleanup_matches: |
598 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
599 | return ret; | |
600 | } | |
601 | ||
602 | static inline int | |
603 | check_entry_size_and_hooks(struct ipt_entry *e, | |
2e4e6a17 | 604 | struct xt_table_info *newinfo, |
1da177e4 LT |
605 | unsigned char *base, |
606 | unsigned char *limit, | |
607 | const unsigned int *hook_entries, | |
608 | const unsigned int *underflows, | |
609 | unsigned int *i) | |
610 | { | |
611 | unsigned int h; | |
612 | ||
613 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 | |
614 | || (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { | |
615 | duprintf("Bad offset %p\n", e); | |
616 | return -EINVAL; | |
617 | } | |
618 | ||
619 | if (e->next_offset | |
620 | < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) { | |
621 | duprintf("checking: element %p size %u\n", | |
622 | e, e->next_offset); | |
623 | return -EINVAL; | |
624 | } | |
625 | ||
626 | /* Check hooks & underflows */ | |
627 | for (h = 0; h < NF_IP_NUMHOOKS; h++) { | |
628 | if ((unsigned char *)e - base == hook_entries[h]) | |
629 | newinfo->hook_entry[h] = hook_entries[h]; | |
630 | if ((unsigned char *)e - base == underflows[h]) | |
631 | newinfo->underflow[h] = underflows[h]; | |
632 | } | |
633 | ||
634 | /* FIXME: underflows must be unconditional, standard verdicts | |
635 | < 0 (not IPT_RETURN). --RR */ | |
636 | ||
637 | /* Clear counters and comefrom */ | |
2e4e6a17 | 638 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
639 | e->comefrom = 0; |
640 | ||
641 | (*i)++; | |
642 | return 0; | |
643 | } | |
644 | ||
645 | static inline int | |
646 | cleanup_entry(struct ipt_entry *e, unsigned int *i) | |
647 | { | |
648 | struct ipt_entry_target *t; | |
649 | ||
650 | if (i && (*i)-- == 0) | |
651 | return 1; | |
652 | ||
653 | /* Cleanup all matches */ | |
654 | IPT_MATCH_ITERATE(e, cleanup_match, NULL); | |
655 | t = ipt_get_target(e); | |
656 | if (t->u.kernel.target->destroy) | |
efa74165 | 657 | t->u.kernel.target->destroy(t->u.kernel.target, t->data); |
1da177e4 LT |
658 | module_put(t->u.kernel.target->me); |
659 | return 0; | |
660 | } | |
661 | ||
662 | /* Checks and translates the user-supplied table segment (held in | |
663 | newinfo) */ | |
664 | static int | |
665 | translate_table(const char *name, | |
666 | unsigned int valid_hooks, | |
2e4e6a17 | 667 | struct xt_table_info *newinfo, |
31836064 | 668 | void *entry0, |
1da177e4 LT |
669 | unsigned int size, |
670 | unsigned int number, | |
671 | const unsigned int *hook_entries, | |
672 | const unsigned int *underflows) | |
673 | { | |
674 | unsigned int i; | |
675 | int ret; | |
676 | ||
677 | newinfo->size = size; | |
678 | newinfo->number = number; | |
679 | ||
680 | /* Init all hooks to impossible value. */ | |
681 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { | |
682 | newinfo->hook_entry[i] = 0xFFFFFFFF; | |
683 | newinfo->underflow[i] = 0xFFFFFFFF; | |
684 | } | |
685 | ||
686 | duprintf("translate_table: size %u\n", newinfo->size); | |
687 | i = 0; | |
688 | /* Walk through entries, checking offsets. */ | |
31836064 | 689 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
690 | check_entry_size_and_hooks, |
691 | newinfo, | |
31836064 ED |
692 | entry0, |
693 | entry0 + size, | |
1da177e4 LT |
694 | hook_entries, underflows, &i); |
695 | if (ret != 0) | |
696 | return ret; | |
697 | ||
698 | if (i != number) { | |
699 | duprintf("translate_table: %u not %u entries\n", | |
700 | i, number); | |
701 | return -EINVAL; | |
702 | } | |
703 | ||
704 | /* Check hooks all assigned */ | |
705 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { | |
706 | /* Only hooks which are valid */ | |
707 | if (!(valid_hooks & (1 << i))) | |
708 | continue; | |
709 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
710 | duprintf("Invalid hook entry %u %u\n", | |
711 | i, hook_entries[i]); | |
712 | return -EINVAL; | |
713 | } | |
714 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
715 | duprintf("Invalid underflow %u %u\n", | |
716 | i, underflows[i]); | |
717 | return -EINVAL; | |
718 | } | |
719 | } | |
720 | ||
1da177e4 LT |
721 | /* Finally, each sanity check must pass */ |
722 | i = 0; | |
31836064 | 723 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
724 | check_entry, name, size, &i); |
725 | ||
590bdf7f DM |
726 | if (ret != 0) |
727 | goto cleanup; | |
728 | ||
729 | ret = -ELOOP; | |
730 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) | |
731 | goto cleanup; | |
1da177e4 LT |
732 | |
733 | /* And one copy for every other CPU */ | |
6f912042 | 734 | for_each_possible_cpu(i) { |
31836064 ED |
735 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
736 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
737 | } |
738 | ||
590bdf7f DM |
739 | return 0; |
740 | cleanup: | |
741 | IPT_ENTRY_ITERATE(entry0, newinfo->size, cleanup_entry, &i); | |
1da177e4 LT |
742 | return ret; |
743 | } | |
744 | ||
1da177e4 LT |
745 | /* Gets counters. */ |
746 | static inline int | |
747 | add_entry_to_counter(const struct ipt_entry *e, | |
2e4e6a17 | 748 | struct xt_counters total[], |
1da177e4 LT |
749 | unsigned int *i) |
750 | { | |
751 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
752 | ||
753 | (*i)++; | |
754 | return 0; | |
755 | } | |
756 | ||
31836064 ED |
757 | static inline int |
758 | set_entry_to_counter(const struct ipt_entry *e, | |
759 | struct ipt_counters total[], | |
760 | unsigned int *i) | |
761 | { | |
762 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
763 | ||
764 | (*i)++; | |
765 | return 0; | |
766 | } | |
767 | ||
1da177e4 | 768 | static void |
2e4e6a17 HW |
769 | get_counters(const struct xt_table_info *t, |
770 | struct xt_counters counters[]) | |
1da177e4 LT |
771 | { |
772 | unsigned int cpu; | |
773 | unsigned int i; | |
31836064 ED |
774 | unsigned int curcpu; |
775 | ||
776 | /* Instead of clearing (by a previous call to memset()) | |
777 | * the counters and using adds, we set the counters | |
778 | * with data used by 'current' CPU | |
779 | * We dont care about preemption here. | |
780 | */ | |
781 | curcpu = raw_smp_processor_id(); | |
782 | ||
783 | i = 0; | |
784 | IPT_ENTRY_ITERATE(t->entries[curcpu], | |
785 | t->size, | |
786 | set_entry_to_counter, | |
787 | counters, | |
788 | &i); | |
1da177e4 | 789 | |
6f912042 | 790 | for_each_possible_cpu(cpu) { |
31836064 ED |
791 | if (cpu == curcpu) |
792 | continue; | |
1da177e4 | 793 | i = 0; |
31836064 | 794 | IPT_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
795 | t->size, |
796 | add_entry_to_counter, | |
797 | counters, | |
798 | &i); | |
799 | } | |
800 | } | |
801 | ||
2722971c | 802 | static inline struct xt_counters * alloc_counters(struct ipt_table *table) |
1da177e4 | 803 | { |
2722971c | 804 | unsigned int countersize; |
2e4e6a17 HW |
805 | struct xt_counters *counters; |
806 | struct xt_table_info *private = table->private; | |
1da177e4 LT |
807 | |
808 | /* We need atomic snapshot of counters: rest doesn't change | |
809 | (other than comefrom, which userspace doesn't care | |
810 | about). */ | |
2e4e6a17 | 811 | countersize = sizeof(struct xt_counters) * private->number; |
31836064 | 812 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
813 | |
814 | if (counters == NULL) | |
2722971c | 815 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
816 | |
817 | /* First, sum counters... */ | |
1da177e4 | 818 | write_lock_bh(&table->lock); |
2e4e6a17 | 819 | get_counters(private, counters); |
1da177e4 LT |
820 | write_unlock_bh(&table->lock); |
821 | ||
2722971c DM |
822 | return counters; |
823 | } | |
824 | ||
825 | static int | |
826 | copy_entries_to_user(unsigned int total_size, | |
827 | struct ipt_table *table, | |
828 | void __user *userptr) | |
829 | { | |
830 | unsigned int off, num; | |
831 | struct ipt_entry *e; | |
832 | struct xt_counters *counters; | |
833 | struct xt_table_info *private = table->private; | |
834 | int ret = 0; | |
835 | void *loc_cpu_entry; | |
836 | ||
837 | counters = alloc_counters(table); | |
838 | if (IS_ERR(counters)) | |
839 | return PTR_ERR(counters); | |
840 | ||
31836064 ED |
841 | /* choose the copy that is on our node/cpu, ... |
842 | * This choice is lazy (because current thread is | |
843 | * allowed to migrate to another cpu) | |
844 | */ | |
2e4e6a17 | 845 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 ED |
846 | /* ... then copy entire thing ... */ |
847 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { | |
1da177e4 LT |
848 | ret = -EFAULT; |
849 | goto free_counters; | |
850 | } | |
851 | ||
852 | /* FIXME: use iterator macros --RR */ | |
853 | /* ... then go back and fix counters and names */ | |
854 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
855 | unsigned int i; | |
856 | struct ipt_entry_match *m; | |
857 | struct ipt_entry_target *t; | |
858 | ||
31836064 | 859 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
860 | if (copy_to_user(userptr + off |
861 | + offsetof(struct ipt_entry, counters), | |
862 | &counters[num], | |
863 | sizeof(counters[num])) != 0) { | |
864 | ret = -EFAULT; | |
865 | goto free_counters; | |
866 | } | |
867 | ||
868 | for (i = sizeof(struct ipt_entry); | |
869 | i < e->target_offset; | |
870 | i += m->u.match_size) { | |
871 | m = (void *)e + i; | |
872 | ||
873 | if (copy_to_user(userptr + off + i | |
874 | + offsetof(struct ipt_entry_match, | |
875 | u.user.name), | |
876 | m->u.kernel.match->name, | |
877 | strlen(m->u.kernel.match->name)+1) | |
878 | != 0) { | |
879 | ret = -EFAULT; | |
880 | goto free_counters; | |
881 | } | |
882 | } | |
883 | ||
884 | t = ipt_get_target(e); | |
885 | if (copy_to_user(userptr + off + e->target_offset | |
886 | + offsetof(struct ipt_entry_target, | |
887 | u.user.name), | |
888 | t->u.kernel.target->name, | |
889 | strlen(t->u.kernel.target->name)+1) != 0) { | |
890 | ret = -EFAULT; | |
891 | goto free_counters; | |
892 | } | |
893 | } | |
894 | ||
895 | free_counters: | |
896 | vfree(counters); | |
897 | return ret; | |
898 | } | |
899 | ||
2722971c DM |
900 | #ifdef CONFIG_COMPAT |
901 | struct compat_delta { | |
902 | struct compat_delta *next; | |
903 | u_int16_t offset; | |
904 | short delta; | |
905 | }; | |
906 | ||
907 | static struct compat_delta *compat_offsets = NULL; | |
908 | ||
909 | static int compat_add_offset(u_int16_t offset, short delta) | |
910 | { | |
911 | struct compat_delta *tmp; | |
912 | ||
913 | tmp = kmalloc(sizeof(struct compat_delta), GFP_KERNEL); | |
914 | if (!tmp) | |
915 | return -ENOMEM; | |
916 | tmp->offset = offset; | |
917 | tmp->delta = delta; | |
918 | if (compat_offsets) { | |
919 | tmp->next = compat_offsets->next; | |
920 | compat_offsets->next = tmp; | |
921 | } else { | |
922 | compat_offsets = tmp; | |
923 | tmp->next = NULL; | |
924 | } | |
925 | return 0; | |
926 | } | |
927 | ||
928 | static void compat_flush_offsets(void) | |
929 | { | |
930 | struct compat_delta *tmp, *next; | |
931 | ||
932 | if (compat_offsets) { | |
933 | for(tmp = compat_offsets; tmp; tmp = next) { | |
934 | next = tmp->next; | |
935 | kfree(tmp); | |
936 | } | |
937 | compat_offsets = NULL; | |
938 | } | |
939 | } | |
940 | ||
941 | static short compat_calc_jump(u_int16_t offset) | |
942 | { | |
943 | struct compat_delta *tmp; | |
944 | short delta; | |
945 | ||
946 | for(tmp = compat_offsets, delta = 0; tmp; tmp = tmp->next) | |
947 | if (tmp->offset < offset) | |
948 | delta += tmp->delta; | |
949 | return delta; | |
950 | } | |
951 | ||
9fa492cd | 952 | static void compat_standard_from_user(void *dst, void *src) |
2722971c | 953 | { |
9fa492cd | 954 | int v = *(compat_int_t *)src; |
2722971c | 955 | |
9fa492cd PM |
956 | if (v > 0) |
957 | v += compat_calc_jump(v); | |
958 | memcpy(dst, &v, sizeof(v)); | |
959 | } | |
46c5ea3c | 960 | |
9fa492cd | 961 | static int compat_standard_to_user(void __user *dst, void *src) |
2722971c | 962 | { |
9fa492cd | 963 | compat_int_t cv = *(int *)src; |
2722971c | 964 | |
9fa492cd PM |
965 | if (cv > 0) |
966 | cv -= compat_calc_jump(cv); | |
967 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
2722971c DM |
968 | } |
969 | ||
970 | static inline int | |
971 | compat_calc_match(struct ipt_entry_match *m, int * size) | |
972 | { | |
9fa492cd | 973 | *size += xt_compat_match_offset(m->u.kernel.match); |
2722971c DM |
974 | return 0; |
975 | } | |
976 | ||
977 | static int compat_calc_entry(struct ipt_entry *e, struct xt_table_info *info, | |
978 | void *base, struct xt_table_info *newinfo) | |
979 | { | |
980 | struct ipt_entry_target *t; | |
981 | u_int16_t entry_offset; | |
982 | int off, i, ret; | |
983 | ||
984 | off = 0; | |
985 | entry_offset = (void *)e - base; | |
986 | IPT_MATCH_ITERATE(e, compat_calc_match, &off); | |
987 | t = ipt_get_target(e); | |
9fa492cd | 988 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c DM |
989 | newinfo->size -= off; |
990 | ret = compat_add_offset(entry_offset, off); | |
991 | if (ret) | |
992 | return ret; | |
993 | ||
994 | for (i = 0; i< NF_IP_NUMHOOKS; i++) { | |
995 | if (info->hook_entry[i] && (e < (struct ipt_entry *) | |
996 | (base + info->hook_entry[i]))) | |
997 | newinfo->hook_entry[i] -= off; | |
998 | if (info->underflow[i] && (e < (struct ipt_entry *) | |
999 | (base + info->underflow[i]))) | |
1000 | newinfo->underflow[i] -= off; | |
1001 | } | |
1002 | return 0; | |
1003 | } | |
1004 | ||
1005 | static int compat_table_info(struct xt_table_info *info, | |
1006 | struct xt_table_info *newinfo) | |
1007 | { | |
1008 | void *loc_cpu_entry; | |
1009 | int i; | |
1010 | ||
1011 | if (!newinfo || !info) | |
1012 | return -EINVAL; | |
1013 | ||
1014 | memset(newinfo, 0, sizeof(struct xt_table_info)); | |
1015 | newinfo->size = info->size; | |
1016 | newinfo->number = info->number; | |
1017 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { | |
1018 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1019 | newinfo->underflow[i] = info->underflow[i]; | |
1020 | } | |
1021 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
1022 | return IPT_ENTRY_ITERATE(loc_cpu_entry, info->size, | |
1023 | compat_calc_entry, info, loc_cpu_entry, newinfo); | |
1024 | } | |
1025 | #endif | |
1026 | ||
1027 | static int get_info(void __user *user, int *len, int compat) | |
1028 | { | |
1029 | char name[IPT_TABLE_MAXNAMELEN]; | |
1030 | struct ipt_table *t; | |
1031 | int ret; | |
1032 | ||
1033 | if (*len != sizeof(struct ipt_getinfo)) { | |
1034 | duprintf("length %u != %u\n", *len, | |
1035 | (unsigned int)sizeof(struct ipt_getinfo)); | |
1036 | return -EINVAL; | |
1037 | } | |
1038 | ||
1039 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1040 | return -EFAULT; | |
1041 | ||
1042 | name[IPT_TABLE_MAXNAMELEN-1] = '\0'; | |
1043 | #ifdef CONFIG_COMPAT | |
1044 | if (compat) | |
1045 | xt_compat_lock(AF_INET); | |
1046 | #endif | |
1047 | t = try_then_request_module(xt_find_table_lock(AF_INET, name), | |
1048 | "iptable_%s", name); | |
1049 | if (t && !IS_ERR(t)) { | |
1050 | struct ipt_getinfo info; | |
1051 | struct xt_table_info *private = t->private; | |
1052 | ||
1053 | #ifdef CONFIG_COMPAT | |
1054 | if (compat) { | |
1055 | struct xt_table_info tmp; | |
1056 | ret = compat_table_info(private, &tmp); | |
1057 | compat_flush_offsets(); | |
1058 | private = &tmp; | |
1059 | } | |
1060 | #endif | |
1061 | info.valid_hooks = t->valid_hooks; | |
1062 | memcpy(info.hook_entry, private->hook_entry, | |
1063 | sizeof(info.hook_entry)); | |
1064 | memcpy(info.underflow, private->underflow, | |
1065 | sizeof(info.underflow)); | |
1066 | info.num_entries = private->number; | |
1067 | info.size = private->size; | |
1068 | strcpy(info.name, name); | |
1069 | ||
1070 | if (copy_to_user(user, &info, *len) != 0) | |
1071 | ret = -EFAULT; | |
1072 | else | |
1073 | ret = 0; | |
1074 | ||
1075 | xt_table_unlock(t); | |
1076 | module_put(t->me); | |
1077 | } else | |
1078 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1079 | #ifdef CONFIG_COMPAT | |
1080 | if (compat) | |
1081 | xt_compat_unlock(AF_INET); | |
1082 | #endif | |
1083 | return ret; | |
1084 | } | |
1085 | ||
1086 | static int | |
1087 | get_entries(struct ipt_get_entries __user *uptr, int *len) | |
1088 | { | |
1089 | int ret; | |
1090 | struct ipt_get_entries get; | |
1091 | struct ipt_table *t; | |
1092 | ||
1093 | if (*len < sizeof(get)) { | |
1094 | duprintf("get_entries: %u < %d\n", *len, | |
1095 | (unsigned int)sizeof(get)); | |
1096 | return -EINVAL; | |
1097 | } | |
1098 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1099 | return -EFAULT; | |
1100 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
1101 | duprintf("get_entries: %u != %u\n", *len, | |
1102 | (unsigned int)(sizeof(struct ipt_get_entries) + | |
1103 | get.size)); | |
1104 | return -EINVAL; | |
1105 | } | |
1106 | ||
1107 | t = xt_find_table_lock(AF_INET, get.name); | |
1108 | if (t && !IS_ERR(t)) { | |
1109 | struct xt_table_info *private = t->private; | |
1110 | duprintf("t->private->number = %u\n", | |
1111 | private->number); | |
1112 | if (get.size == private->size) | |
1113 | ret = copy_entries_to_user(private->size, | |
1114 | t, uptr->entrytable); | |
1115 | else { | |
1116 | duprintf("get_entries: I've got %u not %u!\n", | |
1117 | private->size, | |
1118 | get.size); | |
1119 | ret = -EINVAL; | |
1120 | } | |
1121 | module_put(t->me); | |
1122 | xt_table_unlock(t); | |
1123 | } else | |
1124 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1125 | ||
1126 | return ret; | |
1127 | } | |
1128 | ||
1129 | static int | |
1130 | __do_replace(const char *name, unsigned int valid_hooks, | |
1131 | struct xt_table_info *newinfo, unsigned int num_counters, | |
1132 | void __user *counters_ptr) | |
1133 | { | |
1134 | int ret; | |
1135 | struct ipt_table *t; | |
1136 | struct xt_table_info *oldinfo; | |
1137 | struct xt_counters *counters; | |
1138 | void *loc_cpu_old_entry; | |
1139 | ||
1140 | ret = 0; | |
1141 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); | |
1142 | if (!counters) { | |
1143 | ret = -ENOMEM; | |
1144 | goto out; | |
1145 | } | |
1146 | ||
1147 | t = try_then_request_module(xt_find_table_lock(AF_INET, name), | |
1148 | "iptable_%s", name); | |
1149 | if (!t || IS_ERR(t)) { | |
1150 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1151 | goto free_newinfo_counters_untrans; | |
1152 | } | |
1153 | ||
1154 | /* You lied! */ | |
1155 | if (valid_hooks != t->valid_hooks) { | |
1156 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1157 | valid_hooks, t->valid_hooks); | |
1158 | ret = -EINVAL; | |
1159 | goto put_module; | |
1160 | } | |
1161 | ||
1162 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1163 | if (!oldinfo) | |
1164 | goto put_module; | |
1165 | ||
1166 | /* Update module usage count based on number of rules */ | |
1167 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1168 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1169 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1170 | (newinfo->number <= oldinfo->initial_entries)) | |
1171 | module_put(t->me); | |
1172 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1173 | (newinfo->number <= oldinfo->initial_entries)) | |
1174 | module_put(t->me); | |
1175 | ||
1176 | /* Get the old counters. */ | |
1177 | get_counters(oldinfo, counters); | |
1178 | /* Decrease module usage counts and free resource */ | |
1179 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
1180 | IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL); | |
1181 | xt_free_table_info(oldinfo); | |
1182 | if (copy_to_user(counters_ptr, counters, | |
1183 | sizeof(struct xt_counters) * num_counters) != 0) | |
1184 | ret = -EFAULT; | |
1185 | vfree(counters); | |
1186 | xt_table_unlock(t); | |
1187 | return ret; | |
1188 | ||
1189 | put_module: | |
1190 | module_put(t->me); | |
1191 | xt_table_unlock(t); | |
1192 | free_newinfo_counters_untrans: | |
1193 | vfree(counters); | |
1194 | out: | |
1195 | return ret; | |
1196 | } | |
1197 | ||
1198 | static int | |
1199 | do_replace(void __user *user, unsigned int len) | |
1200 | { | |
1201 | int ret; | |
1202 | struct ipt_replace tmp; | |
1203 | struct xt_table_info *newinfo; | |
1204 | void *loc_cpu_entry; | |
1205 | ||
1206 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1207 | return -EFAULT; | |
1208 | ||
1209 | /* Hack: Causes ipchains to give correct error msg --RR */ | |
1210 | if (len != sizeof(tmp) + tmp.size) | |
1211 | return -ENOPROTOOPT; | |
1212 | ||
1213 | /* overflow check */ | |
1214 | if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS - | |
1215 | SMP_CACHE_BYTES) | |
1216 | return -ENOMEM; | |
1217 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1218 | return -ENOMEM; | |
1219 | ||
1220 | newinfo = xt_alloc_table_info(tmp.size); | |
1221 | if (!newinfo) | |
1222 | return -ENOMEM; | |
1223 | ||
1224 | /* choose the copy that is our node/cpu */ | |
1225 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1226 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1227 | tmp.size) != 0) { | |
1228 | ret = -EFAULT; | |
1229 | goto free_newinfo; | |
1230 | } | |
1231 | ||
1232 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
1233 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, | |
1234 | tmp.hook_entry, tmp.underflow); | |
1235 | if (ret != 0) | |
1236 | goto free_newinfo; | |
1237 | ||
1238 | duprintf("ip_tables: Translated table\n"); | |
1239 | ||
1240 | ret = __do_replace(tmp.name, tmp.valid_hooks, | |
1241 | newinfo, tmp.num_counters, | |
1242 | tmp.counters); | |
1243 | if (ret) | |
1244 | goto free_newinfo_untrans; | |
1245 | return 0; | |
1246 | ||
1247 | free_newinfo_untrans: | |
1248 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL); | |
1249 | free_newinfo: | |
1250 | xt_free_table_info(newinfo); | |
1251 | return ret; | |
1252 | } | |
1253 | ||
1254 | /* We're lazy, and add to the first CPU; overflow works its fey magic | |
1255 | * and everything is OK. */ | |
1256 | static inline int | |
1257 | add_counter_to_entry(struct ipt_entry *e, | |
1258 | const struct xt_counters addme[], | |
1259 | unsigned int *i) | |
1260 | { | |
1261 | #if 0 | |
1262 | duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n", | |
1263 | *i, | |
1264 | (long unsigned int)e->counters.pcnt, | |
1265 | (long unsigned int)e->counters.bcnt, | |
1266 | (long unsigned int)addme[*i].pcnt, | |
1267 | (long unsigned int)addme[*i].bcnt); | |
1268 | #endif | |
1269 | ||
1270 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1271 | ||
1272 | (*i)++; | |
1273 | return 0; | |
1274 | } | |
1275 | ||
1276 | static int | |
1277 | do_add_counters(void __user *user, unsigned int len, int compat) | |
1278 | { | |
1279 | unsigned int i; | |
1280 | struct xt_counters_info tmp; | |
1281 | struct xt_counters *paddc; | |
1282 | unsigned int num_counters; | |
1283 | char *name; | |
1284 | int size; | |
1285 | void *ptmp; | |
1286 | struct ipt_table *t; | |
1287 | struct xt_table_info *private; | |
1288 | int ret = 0; | |
1289 | void *loc_cpu_entry; | |
1290 | #ifdef CONFIG_COMPAT | |
1291 | struct compat_xt_counters_info compat_tmp; | |
1292 | ||
1293 | if (compat) { | |
1294 | ptmp = &compat_tmp; | |
1295 | size = sizeof(struct compat_xt_counters_info); | |
1296 | } else | |
1297 | #endif | |
1298 | { | |
1299 | ptmp = &tmp; | |
1300 | size = sizeof(struct xt_counters_info); | |
1301 | } | |
1302 | ||
1303 | if (copy_from_user(ptmp, user, size) != 0) | |
1304 | return -EFAULT; | |
1305 | ||
1306 | #ifdef CONFIG_COMPAT | |
1307 | if (compat) { | |
1308 | num_counters = compat_tmp.num_counters; | |
1309 | name = compat_tmp.name; | |
1310 | } else | |
1311 | #endif | |
1312 | { | |
1313 | num_counters = tmp.num_counters; | |
1314 | name = tmp.name; | |
1315 | } | |
1316 | ||
1317 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1318 | return -EINVAL; | |
1319 | ||
1320 | paddc = vmalloc_node(len - size, numa_node_id()); | |
1321 | if (!paddc) | |
1322 | return -ENOMEM; | |
1323 | ||
1324 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1325 | ret = -EFAULT; | |
1326 | goto free; | |
1327 | } | |
1328 | ||
1329 | t = xt_find_table_lock(AF_INET, name); | |
1330 | if (!t || IS_ERR(t)) { | |
1331 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1332 | goto free; | |
1333 | } | |
1334 | ||
1335 | write_lock_bh(&t->lock); | |
1336 | private = t->private; | |
1337 | if (private->number != num_counters) { | |
1338 | ret = -EINVAL; | |
1339 | goto unlock_up_free; | |
1340 | } | |
1341 | ||
1342 | i = 0; | |
1343 | /* Choose the copy that is on our node */ | |
1344 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1345 | IPT_ENTRY_ITERATE(loc_cpu_entry, | |
1346 | private->size, | |
1347 | add_counter_to_entry, | |
1348 | paddc, | |
1349 | &i); | |
1350 | unlock_up_free: | |
1351 | write_unlock_bh(&t->lock); | |
1352 | xt_table_unlock(t); | |
1353 | module_put(t->me); | |
1354 | free: | |
1355 | vfree(paddc); | |
1356 | ||
1357 | return ret; | |
1358 | } | |
1359 | ||
1360 | #ifdef CONFIG_COMPAT | |
1361 | struct compat_ipt_replace { | |
1362 | char name[IPT_TABLE_MAXNAMELEN]; | |
1363 | u32 valid_hooks; | |
1364 | u32 num_entries; | |
1365 | u32 size; | |
1366 | u32 hook_entry[NF_IP_NUMHOOKS]; | |
1367 | u32 underflow[NF_IP_NUMHOOKS]; | |
1368 | u32 num_counters; | |
1369 | compat_uptr_t counters; /* struct ipt_counters * */ | |
1370 | struct compat_ipt_entry entries[0]; | |
1371 | }; | |
1372 | ||
1373 | static inline int compat_copy_match_to_user(struct ipt_entry_match *m, | |
3e597c60 | 1374 | void __user **dstptr, compat_uint_t *size) |
2722971c | 1375 | { |
9fa492cd | 1376 | return xt_compat_match_to_user(m, dstptr, size); |
2722971c DM |
1377 | } |
1378 | ||
1379 | static int compat_copy_entry_to_user(struct ipt_entry *e, | |
3e597c60 | 1380 | void __user **dstptr, compat_uint_t *size) |
2722971c | 1381 | { |
3e597c60 | 1382 | struct ipt_entry_target *t; |
2722971c DM |
1383 | struct compat_ipt_entry __user *ce; |
1384 | u_int16_t target_offset, next_offset; | |
1385 | compat_uint_t origsize; | |
1386 | int ret; | |
1387 | ||
1388 | ret = -EFAULT; | |
1389 | origsize = *size; | |
1390 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
7800007c | 1391 | if (copy_to_user(ce, e, sizeof(struct ipt_entry))) |
2722971c DM |
1392 | goto out; |
1393 | ||
1394 | *dstptr += sizeof(struct compat_ipt_entry); | |
1395 | ret = IPT_MATCH_ITERATE(e, compat_copy_match_to_user, dstptr, size); | |
1396 | target_offset = e->target_offset - (origsize - *size); | |
1397 | if (ret) | |
1398 | goto out; | |
1399 | t = ipt_get_target(e); | |
9fa492cd | 1400 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c DM |
1401 | if (ret) |
1402 | goto out; | |
1403 | ret = -EFAULT; | |
1404 | next_offset = e->next_offset - (origsize - *size); | |
7800007c | 1405 | if (put_user(target_offset, &ce->target_offset)) |
2722971c | 1406 | goto out; |
7800007c | 1407 | if (put_user(next_offset, &ce->next_offset)) |
2722971c DM |
1408 | goto out; |
1409 | return 0; | |
1410 | out: | |
1411 | return ret; | |
1412 | } | |
1413 | ||
1414 | static inline int | |
1415 | compat_check_calc_match(struct ipt_entry_match *m, | |
1416 | const char *name, | |
1417 | const struct ipt_ip *ip, | |
1418 | unsigned int hookmask, | |
1419 | int *size, int *i) | |
1420 | { | |
1421 | struct ipt_match *match; | |
1422 | ||
1423 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, | |
1424 | m->u.user.revision), | |
1425 | "ipt_%s", m->u.user.name); | |
1426 | if (IS_ERR(match) || !match) { | |
1427 | duprintf("compat_check_calc_match: `%s' not found\n", | |
1428 | m->u.user.name); | |
1429 | return match ? PTR_ERR(match) : -ENOENT; | |
1430 | } | |
1431 | m->u.kernel.match = match; | |
9fa492cd | 1432 | *size += xt_compat_match_offset(match); |
2722971c DM |
1433 | |
1434 | (*i)++; | |
1435 | return 0; | |
1436 | } | |
1437 | ||
1438 | static inline int | |
1439 | check_compat_entry_size_and_hooks(struct ipt_entry *e, | |
1440 | struct xt_table_info *newinfo, | |
1441 | unsigned int *size, | |
1442 | unsigned char *base, | |
1443 | unsigned char *limit, | |
1444 | unsigned int *hook_entries, | |
1445 | unsigned int *underflows, | |
1446 | unsigned int *i, | |
1447 | const char *name) | |
1448 | { | |
1449 | struct ipt_entry_target *t; | |
1450 | struct ipt_target *target; | |
1451 | u_int16_t entry_offset; | |
1452 | int ret, off, h, j; | |
1453 | ||
1454 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
1455 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 | |
1456 | || (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { | |
1457 | duprintf("Bad offset %p, limit = %p\n", e, limit); | |
1458 | return -EINVAL; | |
1459 | } | |
1460 | ||
1461 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
1462 | sizeof(struct compat_xt_entry_target)) { | |
1463 | duprintf("checking: element %p size %u\n", | |
1464 | e, e->next_offset); | |
1465 | return -EINVAL; | |
1466 | } | |
1467 | ||
1468 | if (!ip_checkentry(&e->ip)) { | |
1469 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
1470 | return -EINVAL; | |
1471 | } | |
1472 | ||
590bdf7f DM |
1473 | if (e->target_offset + sizeof(struct compat_xt_entry_target) > |
1474 | e->next_offset) | |
1475 | return -EINVAL; | |
1476 | ||
2722971c DM |
1477 | off = 0; |
1478 | entry_offset = (void *)e - (void *)base; | |
1479 | j = 0; | |
1480 | ret = IPT_MATCH_ITERATE(e, compat_check_calc_match, name, &e->ip, | |
1481 | e->comefrom, &off, &j); | |
1482 | if (ret != 0) | |
bec71b16 | 1483 | goto cleanup_matches; |
2722971c DM |
1484 | |
1485 | t = ipt_get_target(e); | |
590bdf7f DM |
1486 | ret = -EINVAL; |
1487 | if (e->target_offset + t->u.target_size > e->next_offset) | |
1488 | goto cleanup_matches; | |
2722971c DM |
1489 | target = try_then_request_module(xt_find_target(AF_INET, |
1490 | t->u.user.name, | |
1491 | t->u.user.revision), | |
1492 | "ipt_%s", t->u.user.name); | |
1493 | if (IS_ERR(target) || !target) { | |
1494 | duprintf("check_entry: `%s' not found\n", t->u.user.name); | |
1495 | ret = target ? PTR_ERR(target) : -ENOENT; | |
bec71b16 | 1496 | goto cleanup_matches; |
2722971c DM |
1497 | } |
1498 | t->u.kernel.target = target; | |
1499 | ||
9fa492cd | 1500 | off += xt_compat_target_offset(target); |
2722971c DM |
1501 | *size += off; |
1502 | ret = compat_add_offset(entry_offset, off); | |
1503 | if (ret) | |
1504 | goto out; | |
1505 | ||
1506 | /* Check hooks & underflows */ | |
1507 | for (h = 0; h < NF_IP_NUMHOOKS; h++) { | |
1508 | if ((unsigned char *)e - base == hook_entries[h]) | |
1509 | newinfo->hook_entry[h] = hook_entries[h]; | |
1510 | if ((unsigned char *)e - base == underflows[h]) | |
1511 | newinfo->underflow[h] = underflows[h]; | |
1512 | } | |
1513 | ||
1514 | /* Clear counters and comefrom */ | |
1515 | e->counters = ((struct ipt_counters) { 0, 0 }); | |
1516 | e->comefrom = 0; | |
1517 | ||
1518 | (*i)++; | |
1519 | return 0; | |
bec71b16 | 1520 | |
2722971c | 1521 | out: |
bec71b16 PM |
1522 | module_put(t->u.kernel.target->me); |
1523 | cleanup_matches: | |
2722971c DM |
1524 | IPT_MATCH_ITERATE(e, cleanup_match, &j); |
1525 | return ret; | |
1526 | } | |
1527 | ||
1528 | static inline int compat_copy_match_from_user(struct ipt_entry_match *m, | |
1529 | void **dstptr, compat_uint_t *size, const char *name, | |
920b868a | 1530 | const struct ipt_ip *ip, unsigned int hookmask) |
2722971c DM |
1531 | { |
1532 | struct ipt_entry_match *dm; | |
1533 | struct ipt_match *match; | |
1534 | int ret; | |
1535 | ||
1536 | dm = (struct ipt_entry_match *)*dstptr; | |
1537 | match = m->u.kernel.match; | |
9fa492cd | 1538 | xt_compat_match_from_user(m, dstptr, size); |
2722971c DM |
1539 | |
1540 | ret = xt_check_match(match, AF_INET, dm->u.match_size - sizeof(*dm), | |
1541 | name, hookmask, ip->proto, | |
1542 | ip->invflags & IPT_INV_PROTO); | |
920b868a | 1543 | if (!ret && m->u.kernel.match->checkentry |
2722971c | 1544 | && !m->u.kernel.match->checkentry(name, ip, match, dm->data, |
2722971c DM |
1545 | hookmask)) { |
1546 | duprintf("ip_tables: check failed for `%s'.\n", | |
1547 | m->u.kernel.match->name); | |
bec71b16 | 1548 | ret = -EINVAL; |
2722971c | 1549 | } |
bec71b16 | 1550 | return ret; |
2722971c DM |
1551 | } |
1552 | ||
1553 | static int compat_copy_entry_from_user(struct ipt_entry *e, void **dstptr, | |
1554 | unsigned int *size, const char *name, | |
1555 | struct xt_table_info *newinfo, unsigned char *base) | |
1556 | { | |
1557 | struct ipt_entry_target *t; | |
1558 | struct ipt_target *target; | |
1559 | struct ipt_entry *de; | |
1560 | unsigned int origsize; | |
920b868a | 1561 | int ret, h; |
2722971c DM |
1562 | |
1563 | ret = 0; | |
1564 | origsize = *size; | |
1565 | de = (struct ipt_entry *)*dstptr; | |
1566 | memcpy(de, e, sizeof(struct ipt_entry)); | |
1567 | ||
1568 | *dstptr += sizeof(struct compat_ipt_entry); | |
1569 | ret = IPT_MATCH_ITERATE(e, compat_copy_match_from_user, dstptr, size, | |
920b868a | 1570 | name, &de->ip, de->comefrom); |
2722971c | 1571 | if (ret) |
920b868a | 1572 | goto err; |
2722971c DM |
1573 | de->target_offset = e->target_offset - (origsize - *size); |
1574 | t = ipt_get_target(e); | |
1575 | target = t->u.kernel.target; | |
9fa492cd | 1576 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1577 | |
1578 | de->next_offset = e->next_offset - (origsize - *size); | |
1579 | for (h = 0; h < NF_IP_NUMHOOKS; h++) { | |
1580 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1581 | newinfo->hook_entry[h] -= origsize - *size; | |
1582 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1583 | newinfo->underflow[h] -= origsize - *size; | |
1584 | } | |
1585 | ||
1586 | t = ipt_get_target(de); | |
1587 | target = t->u.kernel.target; | |
1588 | ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t), | |
1589 | name, e->comefrom, e->ip.proto, | |
1590 | e->ip.invflags & IPT_INV_PROTO); | |
1591 | if (ret) | |
bec71b16 | 1592 | goto err; |
2722971c DM |
1593 | |
1594 | ret = -EINVAL; | |
1595 | if (t->u.kernel.target == &ipt_standard_target) { | |
1596 | if (!standard_check(t, *size)) | |
bec71b16 | 1597 | goto err; |
2722971c DM |
1598 | } else if (t->u.kernel.target->checkentry |
1599 | && !t->u.kernel.target->checkentry(name, de, target, | |
efa74165 | 1600 | t->data, de->comefrom)) { |
2722971c DM |
1601 | duprintf("ip_tables: compat: check failed for `%s'.\n", |
1602 | t->u.kernel.target->name); | |
bec71b16 | 1603 | goto err; |
2722971c DM |
1604 | } |
1605 | ret = 0; | |
bec71b16 | 1606 | err: |
2722971c DM |
1607 | return ret; |
1608 | } | |
1609 | ||
1da177e4 | 1610 | static int |
2722971c DM |
1611 | translate_compat_table(const char *name, |
1612 | unsigned int valid_hooks, | |
1613 | struct xt_table_info **pinfo, | |
1614 | void **pentry0, | |
1615 | unsigned int total_size, | |
1616 | unsigned int number, | |
1617 | unsigned int *hook_entries, | |
1618 | unsigned int *underflows) | |
1da177e4 | 1619 | { |
920b868a | 1620 | unsigned int i, j; |
2722971c DM |
1621 | struct xt_table_info *newinfo, *info; |
1622 | void *pos, *entry0, *entry1; | |
1623 | unsigned int size; | |
1da177e4 | 1624 | int ret; |
1da177e4 | 1625 | |
2722971c DM |
1626 | info = *pinfo; |
1627 | entry0 = *pentry0; | |
1628 | size = total_size; | |
1629 | info->number = number; | |
1630 | ||
1631 | /* Init all hooks to impossible value. */ | |
1632 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { | |
1633 | info->hook_entry[i] = 0xFFFFFFFF; | |
1634 | info->underflow[i] = 0xFFFFFFFF; | |
1635 | } | |
1636 | ||
1637 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1638 | j = 0; |
2722971c DM |
1639 | xt_compat_lock(AF_INET); |
1640 | /* Walk through entries, checking offsets. */ | |
1641 | ret = IPT_ENTRY_ITERATE(entry0, total_size, | |
1642 | check_compat_entry_size_and_hooks, | |
1643 | info, &size, entry0, | |
1644 | entry0 + total_size, | |
920b868a | 1645 | hook_entries, underflows, &j, name); |
2722971c DM |
1646 | if (ret != 0) |
1647 | goto out_unlock; | |
1648 | ||
1649 | ret = -EINVAL; | |
920b868a | 1650 | if (j != number) { |
2722971c | 1651 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1652 | j, number); |
2722971c DM |
1653 | goto out_unlock; |
1654 | } | |
1655 | ||
1656 | /* Check hooks all assigned */ | |
1657 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { | |
1658 | /* Only hooks which are valid */ | |
1659 | if (!(valid_hooks & (1 << i))) | |
1660 | continue; | |
1661 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1662 | duprintf("Invalid hook entry %u %u\n", | |
1663 | i, hook_entries[i]); | |
1664 | goto out_unlock; | |
1da177e4 | 1665 | } |
2722971c DM |
1666 | if (info->underflow[i] == 0xFFFFFFFF) { |
1667 | duprintf("Invalid underflow %u %u\n", | |
1668 | i, underflows[i]); | |
1669 | goto out_unlock; | |
1670 | } | |
1671 | } | |
1672 | ||
1673 | ret = -ENOMEM; | |
1674 | newinfo = xt_alloc_table_info(size); | |
1675 | if (!newinfo) | |
1676 | goto out_unlock; | |
1677 | ||
1678 | newinfo->number = number; | |
1679 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { | |
1680 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1681 | newinfo->underflow[i] = info->underflow[i]; | |
1682 | } | |
1683 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1684 | pos = entry1; | |
1685 | size = total_size; | |
1686 | ret = IPT_ENTRY_ITERATE(entry0, total_size, | |
1687 | compat_copy_entry_from_user, &pos, &size, | |
1688 | name, newinfo, entry1); | |
1689 | compat_flush_offsets(); | |
1690 | xt_compat_unlock(AF_INET); | |
1691 | if (ret) | |
1692 | goto free_newinfo; | |
1693 | ||
1694 | ret = -ELOOP; | |
1695 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1696 | goto free_newinfo; | |
1697 | ||
1698 | /* And one copy for every other CPU */ | |
fb1bb34d | 1699 | for_each_possible_cpu(i) |
2722971c DM |
1700 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1701 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1702 | ||
1703 | *pinfo = newinfo; | |
1704 | *pentry0 = entry1; | |
1705 | xt_free_table_info(info); | |
1706 | return 0; | |
1da177e4 | 1707 | |
2722971c DM |
1708 | free_newinfo: |
1709 | xt_free_table_info(newinfo); | |
1710 | out: | |
920b868a | 1711 | IPT_ENTRY_ITERATE(entry0, total_size, cleanup_entry, &j); |
1da177e4 | 1712 | return ret; |
2722971c | 1713 | out_unlock: |
ef4512e7 | 1714 | compat_flush_offsets(); |
2722971c DM |
1715 | xt_compat_unlock(AF_INET); |
1716 | goto out; | |
1da177e4 LT |
1717 | } |
1718 | ||
1719 | static int | |
2722971c | 1720 | compat_do_replace(void __user *user, unsigned int len) |
1da177e4 LT |
1721 | { |
1722 | int ret; | |
2722971c DM |
1723 | struct compat_ipt_replace tmp; |
1724 | struct xt_table_info *newinfo; | |
1725 | void *loc_cpu_entry; | |
1da177e4 LT |
1726 | |
1727 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1728 | return -EFAULT; | |
1729 | ||
1730 | /* Hack: Causes ipchains to give correct error msg --RR */ | |
1731 | if (len != sizeof(tmp) + tmp.size) | |
1732 | return -ENOPROTOOPT; | |
1733 | ||
ee4bb818 KK |
1734 | /* overflow check */ |
1735 | if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS - | |
1736 | SMP_CACHE_BYTES) | |
1737 | return -ENOMEM; | |
1738 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1739 | return -ENOMEM; | |
1740 | ||
2e4e6a17 | 1741 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1742 | if (!newinfo) |
1743 | return -ENOMEM; | |
1744 | ||
31836064 ED |
1745 | /* choose the copy that is our node/cpu */ |
1746 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1747 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1748 | tmp.size) != 0) { |
1749 | ret = -EFAULT; | |
1750 | goto free_newinfo; | |
1751 | } | |
1752 | ||
2722971c DM |
1753 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, |
1754 | &newinfo, &loc_cpu_entry, tmp.size, | |
1755 | tmp.num_entries, tmp.hook_entry, tmp.underflow); | |
1756 | if (ret != 0) | |
1da177e4 | 1757 | goto free_newinfo; |
1da177e4 | 1758 | |
2722971c | 1759 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1760 | |
2722971c DM |
1761 | ret = __do_replace(tmp.name, tmp.valid_hooks, |
1762 | newinfo, tmp.num_counters, | |
1763 | compat_ptr(tmp.counters)); | |
1764 | if (ret) | |
1765 | goto free_newinfo_untrans; | |
1766 | return 0; | |
1da177e4 | 1767 | |
2722971c DM |
1768 | free_newinfo_untrans: |
1769 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL); | |
1770 | free_newinfo: | |
1771 | xt_free_table_info(newinfo); | |
1772 | return ret; | |
1773 | } | |
1da177e4 | 1774 | |
2722971c DM |
1775 | static int |
1776 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1777 | unsigned int len) | |
1778 | { | |
1779 | int ret; | |
1da177e4 | 1780 | |
2722971c DM |
1781 | if (!capable(CAP_NET_ADMIN)) |
1782 | return -EPERM; | |
1da177e4 | 1783 | |
2722971c DM |
1784 | switch (cmd) { |
1785 | case IPT_SO_SET_REPLACE: | |
1786 | ret = compat_do_replace(user, len); | |
1787 | break; | |
1da177e4 | 1788 | |
2722971c DM |
1789 | case IPT_SO_SET_ADD_COUNTERS: |
1790 | ret = do_add_counters(user, len, 1); | |
1791 | break; | |
1792 | ||
1793 | default: | |
1794 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1795 | ret = -EINVAL; | |
1796 | } | |
1da177e4 | 1797 | |
1da177e4 LT |
1798 | return ret; |
1799 | } | |
1800 | ||
2722971c | 1801 | struct compat_ipt_get_entries |
1da177e4 | 1802 | { |
2722971c DM |
1803 | char name[IPT_TABLE_MAXNAMELEN]; |
1804 | compat_uint_t size; | |
1805 | struct compat_ipt_entry entrytable[0]; | |
1806 | }; | |
1da177e4 | 1807 | |
2722971c DM |
1808 | static int compat_copy_entries_to_user(unsigned int total_size, |
1809 | struct ipt_table *table, void __user *userptr) | |
1810 | { | |
1811 | unsigned int off, num; | |
1812 | struct compat_ipt_entry e; | |
1813 | struct xt_counters *counters; | |
1814 | struct xt_table_info *private = table->private; | |
1815 | void __user *pos; | |
1816 | unsigned int size; | |
1817 | int ret = 0; | |
1818 | void *loc_cpu_entry; | |
1da177e4 | 1819 | |
2722971c DM |
1820 | counters = alloc_counters(table); |
1821 | if (IS_ERR(counters)) | |
1822 | return PTR_ERR(counters); | |
1823 | ||
1824 | /* choose the copy that is on our node/cpu, ... | |
1825 | * This choice is lazy (because current thread is | |
1826 | * allowed to migrate to another cpu) | |
1827 | */ | |
1828 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1829 | pos = userptr; | |
1830 | size = total_size; | |
1831 | ret = IPT_ENTRY_ITERATE(loc_cpu_entry, total_size, | |
1832 | compat_copy_entry_to_user, &pos, &size); | |
1833 | if (ret) | |
1834 | goto free_counters; | |
1835 | ||
1836 | /* ... then go back and fix counters and names */ | |
1837 | for (off = 0, num = 0; off < size; off += e.next_offset, num++) { | |
1838 | unsigned int i; | |
1839 | struct ipt_entry_match m; | |
1840 | struct ipt_entry_target t; | |
1841 | ||
1842 | ret = -EFAULT; | |
1843 | if (copy_from_user(&e, userptr + off, | |
1844 | sizeof(struct compat_ipt_entry))) | |
1845 | goto free_counters; | |
1846 | if (copy_to_user(userptr + off + | |
1847 | offsetof(struct compat_ipt_entry, counters), | |
1848 | &counters[num], sizeof(counters[num]))) | |
1849 | goto free_counters; | |
1850 | ||
1851 | for (i = sizeof(struct compat_ipt_entry); | |
1852 | i < e.target_offset; i += m.u.match_size) { | |
1853 | if (copy_from_user(&m, userptr + off + i, | |
1854 | sizeof(struct ipt_entry_match))) | |
1855 | goto free_counters; | |
1856 | if (copy_to_user(userptr + off + i + | |
1857 | offsetof(struct ipt_entry_match, u.user.name), | |
1858 | m.u.kernel.match->name, | |
1859 | strlen(m.u.kernel.match->name) + 1)) | |
1860 | goto free_counters; | |
1861 | } | |
1862 | ||
1863 | if (copy_from_user(&t, userptr + off + e.target_offset, | |
1864 | sizeof(struct ipt_entry_target))) | |
1865 | goto free_counters; | |
1866 | if (copy_to_user(userptr + off + e.target_offset + | |
1867 | offsetof(struct ipt_entry_target, u.user.name), | |
1868 | t.u.kernel.target->name, | |
1869 | strlen(t.u.kernel.target->name) + 1)) | |
1870 | goto free_counters; | |
1871 | } | |
1872 | ret = 0; | |
1873 | free_counters: | |
1874 | vfree(counters); | |
1875 | return ret; | |
1da177e4 LT |
1876 | } |
1877 | ||
1878 | static int | |
2722971c | 1879 | compat_get_entries(struct compat_ipt_get_entries __user *uptr, int *len) |
1da177e4 | 1880 | { |
2722971c DM |
1881 | int ret; |
1882 | struct compat_ipt_get_entries get; | |
1da177e4 | 1883 | struct ipt_table *t; |
1da177e4 | 1884 | |
1da177e4 | 1885 | |
2722971c DM |
1886 | if (*len < sizeof(get)) { |
1887 | duprintf("compat_get_entries: %u < %u\n", | |
1888 | *len, (unsigned int)sizeof(get)); | |
1da177e4 | 1889 | return -EINVAL; |
2722971c | 1890 | } |
1da177e4 | 1891 | |
2722971c DM |
1892 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1893 | return -EFAULT; | |
1da177e4 | 1894 | |
2722971c DM |
1895 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
1896 | duprintf("compat_get_entries: %u != %u\n", *len, | |
1897 | (unsigned int)(sizeof(struct compat_ipt_get_entries) + | |
1898 | get.size)); | |
1899 | return -EINVAL; | |
1da177e4 LT |
1900 | } |
1901 | ||
2722971c DM |
1902 | xt_compat_lock(AF_INET); |
1903 | t = xt_find_table_lock(AF_INET, get.name); | |
1904 | if (t && !IS_ERR(t)) { | |
1905 | struct xt_table_info *private = t->private; | |
1906 | struct xt_table_info info; | |
1907 | duprintf("t->private->number = %u\n", | |
1908 | private->number); | |
1909 | ret = compat_table_info(private, &info); | |
1910 | if (!ret && get.size == info.size) { | |
1911 | ret = compat_copy_entries_to_user(private->size, | |
1912 | t, uptr->entrytable); | |
1913 | } else if (!ret) { | |
1914 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
1915 | private->size, | |
1916 | get.size); | |
1917 | ret = -EINVAL; | |
1918 | } | |
1919 | compat_flush_offsets(); | |
1920 | module_put(t->me); | |
1921 | xt_table_unlock(t); | |
1922 | } else | |
1da177e4 | 1923 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1924 | |
2722971c DM |
1925 | xt_compat_unlock(AF_INET); |
1926 | return ret; | |
1927 | } | |
1da177e4 | 1928 | |
79030ed0 PM |
1929 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1930 | ||
2722971c DM |
1931 | static int |
1932 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1933 | { | |
1934 | int ret; | |
1da177e4 | 1935 | |
82fac054 BS |
1936 | if (!capable(CAP_NET_ADMIN)) |
1937 | return -EPERM; | |
1938 | ||
2722971c DM |
1939 | switch (cmd) { |
1940 | case IPT_SO_GET_INFO: | |
1941 | ret = get_info(user, len, 1); | |
1942 | break; | |
1943 | case IPT_SO_GET_ENTRIES: | |
1944 | ret = compat_get_entries(user, len); | |
1945 | break; | |
1946 | default: | |
79030ed0 | 1947 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1948 | } |
1da177e4 LT |
1949 | return ret; |
1950 | } | |
2722971c | 1951 | #endif |
1da177e4 LT |
1952 | |
1953 | static int | |
1954 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
1955 | { | |
1956 | int ret; | |
1957 | ||
1958 | if (!capable(CAP_NET_ADMIN)) | |
1959 | return -EPERM; | |
1960 | ||
1961 | switch (cmd) { | |
1962 | case IPT_SO_SET_REPLACE: | |
1963 | ret = do_replace(user, len); | |
1964 | break; | |
1965 | ||
1966 | case IPT_SO_SET_ADD_COUNTERS: | |
2722971c | 1967 | ret = do_add_counters(user, len, 0); |
1da177e4 LT |
1968 | break; |
1969 | ||
1970 | default: | |
1971 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1972 | ret = -EINVAL; | |
1973 | } | |
1974 | ||
1975 | return ret; | |
1976 | } | |
1977 | ||
1978 | static int | |
1979 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1980 | { | |
1981 | int ret; | |
1982 | ||
1983 | if (!capable(CAP_NET_ADMIN)) | |
1984 | return -EPERM; | |
1985 | ||
1986 | switch (cmd) { | |
2722971c DM |
1987 | case IPT_SO_GET_INFO: |
1988 | ret = get_info(user, len, 0); | |
1989 | break; | |
1da177e4 | 1990 | |
2722971c DM |
1991 | case IPT_SO_GET_ENTRIES: |
1992 | ret = get_entries(user, len); | |
1da177e4 | 1993 | break; |
1da177e4 LT |
1994 | |
1995 | case IPT_SO_GET_REVISION_MATCH: | |
1996 | case IPT_SO_GET_REVISION_TARGET: { | |
1997 | struct ipt_get_revision rev; | |
2e4e6a17 | 1998 | int target; |
1da177e4 LT |
1999 | |
2000 | if (*len != sizeof(rev)) { | |
2001 | ret = -EINVAL; | |
2002 | break; | |
2003 | } | |
2004 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2005 | ret = -EFAULT; | |
2006 | break; | |
2007 | } | |
2008 | ||
2009 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2010 | target = 1; |
1da177e4 | 2011 | else |
2e4e6a17 | 2012 | target = 0; |
1da177e4 | 2013 | |
2e4e6a17 HW |
2014 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2015 | rev.revision, | |
2016 | target, &ret), | |
1da177e4 LT |
2017 | "ipt_%s", rev.name); |
2018 | break; | |
2019 | } | |
2020 | ||
2021 | default: | |
2022 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2023 | ret = -EINVAL; | |
2024 | } | |
2025 | ||
2026 | return ret; | |
2027 | } | |
2028 | ||
2e4e6a17 | 2029 | int ipt_register_table(struct xt_table *table, const struct ipt_replace *repl) |
1da177e4 LT |
2030 | { |
2031 | int ret; | |
2e4e6a17 HW |
2032 | struct xt_table_info *newinfo; |
2033 | static struct xt_table_info bootstrap | |
1da177e4 | 2034 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2035 | void *loc_cpu_entry; |
1da177e4 | 2036 | |
2e4e6a17 | 2037 | newinfo = xt_alloc_table_info(repl->size); |
1da177e4 LT |
2038 | if (!newinfo) |
2039 | return -ENOMEM; | |
2040 | ||
31836064 ED |
2041 | /* choose the copy on our node/cpu |
2042 | * but dont care of preemption | |
2043 | */ | |
2044 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
2045 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
2046 | |
2047 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 2048 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
2049 | repl->num_entries, |
2050 | repl->hook_entry, | |
2051 | repl->underflow); | |
2052 | if (ret != 0) { | |
2e4e6a17 | 2053 | xt_free_table_info(newinfo); |
1da177e4 LT |
2054 | return ret; |
2055 | } | |
2056 | ||
da298d3a PM |
2057 | ret = xt_register_table(table, &bootstrap, newinfo); |
2058 | if (ret != 0) { | |
2e4e6a17 | 2059 | xt_free_table_info(newinfo); |
1da177e4 LT |
2060 | return ret; |
2061 | } | |
2062 | ||
2e4e6a17 | 2063 | return 0; |
1da177e4 LT |
2064 | } |
2065 | ||
2066 | void ipt_unregister_table(struct ipt_table *table) | |
2067 | { | |
2e4e6a17 | 2068 | struct xt_table_info *private; |
31836064 ED |
2069 | void *loc_cpu_entry; |
2070 | ||
2e4e6a17 | 2071 | private = xt_unregister_table(table); |
1da177e4 LT |
2072 | |
2073 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
2074 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
2075 | IPT_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
2076 | xt_free_table_info(private); | |
1da177e4 LT |
2077 | } |
2078 | ||
2079 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
2080 | static inline int | |
2081 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, | |
2082 | u_int8_t type, u_int8_t code, | |
2083 | int invert) | |
2084 | { | |
2085 | return ((test_type == 0xFF) || (type == test_type && code >= min_code && code <= max_code)) | |
2086 | ^ invert; | |
2087 | } | |
2088 | ||
2089 | static int | |
2090 | icmp_match(const struct sk_buff *skb, | |
2091 | const struct net_device *in, | |
2092 | const struct net_device *out, | |
c4986734 | 2093 | const struct xt_match *match, |
1da177e4 LT |
2094 | const void *matchinfo, |
2095 | int offset, | |
2e4e6a17 | 2096 | unsigned int protoff, |
1da177e4 LT |
2097 | int *hotdrop) |
2098 | { | |
2099 | struct icmphdr _icmph, *ic; | |
2100 | const struct ipt_icmp *icmpinfo = matchinfo; | |
2101 | ||
2102 | /* Must not be a fragment. */ | |
2103 | if (offset) | |
2104 | return 0; | |
2105 | ||
2e4e6a17 | 2106 | ic = skb_header_pointer(skb, protoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2107 | if (ic == NULL) { |
2108 | /* We've been asked to examine this packet, and we | |
2109 | * can't. Hence, no choice but to drop. | |
2110 | */ | |
2111 | duprintf("Dropping evil ICMP tinygram.\n"); | |
2112 | *hotdrop = 1; | |
2113 | return 0; | |
2114 | } | |
2115 | ||
2116 | return icmp_type_code_match(icmpinfo->type, | |
2117 | icmpinfo->code[0], | |
2118 | icmpinfo->code[1], | |
2119 | ic->type, ic->code, | |
2120 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2121 | } | |
2122 | ||
2123 | /* Called when user tries to insert an entry of this type. */ | |
2124 | static int | |
2125 | icmp_checkentry(const char *tablename, | |
2e4e6a17 | 2126 | const void *info, |
c4986734 | 2127 | const struct xt_match *match, |
1da177e4 | 2128 | void *matchinfo, |
1da177e4 LT |
2129 | unsigned int hook_mask) |
2130 | { | |
2131 | const struct ipt_icmp *icmpinfo = matchinfo; | |
2132 | ||
1d5cd909 PM |
2133 | /* Must specify no unknown invflags */ |
2134 | return !(icmpinfo->invflags & ~IPT_ICMP_INV); | |
1da177e4 LT |
2135 | } |
2136 | ||
2137 | /* The built-in targets: standard (NULL) and error. */ | |
2138 | static struct ipt_target ipt_standard_target = { | |
2139 | .name = IPT_STANDARD_TARGET, | |
1d5cd909 | 2140 | .targetsize = sizeof(int), |
a45049c5 | 2141 | .family = AF_INET, |
2722971c | 2142 | #ifdef CONFIG_COMPAT |
9fa492cd PM |
2143 | .compatsize = sizeof(compat_int_t), |
2144 | .compat_from_user = compat_standard_from_user, | |
2145 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2146 | #endif |
1da177e4 LT |
2147 | }; |
2148 | ||
2149 | static struct ipt_target ipt_error_target = { | |
2150 | .name = IPT_ERROR_TARGET, | |
2151 | .target = ipt_error, | |
1d5cd909 | 2152 | .targetsize = IPT_FUNCTION_MAXNAMELEN, |
a45049c5 | 2153 | .family = AF_INET, |
1da177e4 LT |
2154 | }; |
2155 | ||
2156 | static struct nf_sockopt_ops ipt_sockopts = { | |
2157 | .pf = PF_INET, | |
2158 | .set_optmin = IPT_BASE_CTL, | |
2159 | .set_optmax = IPT_SO_SET_MAX+1, | |
2160 | .set = do_ipt_set_ctl, | |
2722971c DM |
2161 | #ifdef CONFIG_COMPAT |
2162 | .compat_set = compat_do_ipt_set_ctl, | |
2163 | #endif | |
1da177e4 LT |
2164 | .get_optmin = IPT_BASE_CTL, |
2165 | .get_optmax = IPT_SO_GET_MAX+1, | |
2166 | .get = do_ipt_get_ctl, | |
2722971c DM |
2167 | #ifdef CONFIG_COMPAT |
2168 | .compat_get = compat_do_ipt_get_ctl, | |
2169 | #endif | |
1da177e4 LT |
2170 | }; |
2171 | ||
1da177e4 LT |
2172 | static struct ipt_match icmp_matchstruct = { |
2173 | .name = "icmp", | |
1d5cd909 PM |
2174 | .match = icmp_match, |
2175 | .matchsize = sizeof(struct ipt_icmp), | |
2176 | .proto = IPPROTO_ICMP, | |
a45049c5 | 2177 | .family = AF_INET, |
1d5cd909 | 2178 | .checkentry = icmp_checkentry, |
1da177e4 LT |
2179 | }; |
2180 | ||
65b4b4e8 | 2181 | static int __init ip_tables_init(void) |
1da177e4 LT |
2182 | { |
2183 | int ret; | |
2184 | ||
0eff66e6 PM |
2185 | ret = xt_proto_init(AF_INET); |
2186 | if (ret < 0) | |
2187 | goto err1; | |
2e4e6a17 | 2188 | |
1da177e4 | 2189 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2190 | ret = xt_register_target(&ipt_standard_target); |
2191 | if (ret < 0) | |
2192 | goto err2; | |
2193 | ret = xt_register_target(&ipt_error_target); | |
2194 | if (ret < 0) | |
2195 | goto err3; | |
2196 | ret = xt_register_match(&icmp_matchstruct); | |
2197 | if (ret < 0) | |
2198 | goto err4; | |
1da177e4 LT |
2199 | |
2200 | /* Register setsockopt */ | |
2201 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2202 | if (ret < 0) |
2203 | goto err5; | |
1da177e4 | 2204 | |
2e4e6a17 | 2205 | printk("ip_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2206 | return 0; |
0eff66e6 PM |
2207 | |
2208 | err5: | |
2209 | xt_unregister_match(&icmp_matchstruct); | |
2210 | err4: | |
2211 | xt_unregister_target(&ipt_error_target); | |
2212 | err3: | |
2213 | xt_unregister_target(&ipt_standard_target); | |
2214 | err2: | |
2215 | xt_proto_fini(AF_INET); | |
2216 | err1: | |
2217 | return ret; | |
1da177e4 LT |
2218 | } |
2219 | ||
65b4b4e8 | 2220 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2221 | { |
2222 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2223 | |
a45049c5 PNA |
2224 | xt_unregister_match(&icmp_matchstruct); |
2225 | xt_unregister_target(&ipt_error_target); | |
2226 | xt_unregister_target(&ipt_standard_target); | |
2e4e6a17 HW |
2227 | |
2228 | xt_proto_fini(AF_INET); | |
1da177e4 LT |
2229 | } |
2230 | ||
2231 | EXPORT_SYMBOL(ipt_register_table); | |
2232 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2233 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2234 | module_init(ip_tables_init); |
2235 | module_exit(ip_tables_fini); |