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. | |
1da177e4 | 10 | */ |
1da177e4 | 11 | #include <linux/cache.h> |
4fc268d2 | 12 | #include <linux/capability.h> |
1da177e4 LT |
13 | #include <linux/skbuff.h> |
14 | #include <linux/kmod.h> | |
15 | #include <linux/vmalloc.h> | |
16 | #include <linux/netdevice.h> | |
17 | #include <linux/module.h> | |
1da177e4 LT |
18 | #include <linux/icmp.h> |
19 | #include <net/ip.h> | |
2722971c | 20 | #include <net/compat.h> |
1da177e4 | 21 | #include <asm/uaccess.h> |
57b47a53 | 22 | #include <linux/mutex.h> |
1da177e4 LT |
23 | #include <linux/proc_fs.h> |
24 | #include <linux/err.h> | |
c8923c6b | 25 | #include <linux/cpumask.h> |
1da177e4 | 26 | |
2e4e6a17 | 27 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 28 | #include <linux/netfilter_ipv4/ip_tables.h> |
f01ffbd6 | 29 | #include <net/netfilter/nf_log.h> |
1da177e4 LT |
30 | |
31 | MODULE_LICENSE("GPL"); | |
32 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
33 | MODULE_DESCRIPTION("IPv4 packet filter"); | |
34 | ||
35 | /*#define DEBUG_IP_FIREWALL*/ | |
36 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
37 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
38 | ||
39 | #ifdef DEBUG_IP_FIREWALL | |
40 | #define dprintf(format, args...) printk(format , ## args) | |
41 | #else | |
42 | #define dprintf(format, args...) | |
43 | #endif | |
44 | ||
45 | #ifdef DEBUG_IP_FIREWALL_USER | |
46 | #define duprintf(format, args...) printk(format , ## args) | |
47 | #else | |
48 | #define duprintf(format, args...) | |
49 | #endif | |
50 | ||
51 | #ifdef CONFIG_NETFILTER_DEBUG | |
52 | #define IP_NF_ASSERT(x) \ | |
53 | do { \ | |
54 | if (!(x)) \ | |
55 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ | |
0dc47877 | 56 | __func__, __FILE__, __LINE__); \ |
1da177e4 LT |
57 | } while(0) |
58 | #else | |
59 | #define IP_NF_ASSERT(x) | |
60 | #endif | |
1da177e4 LT |
61 | |
62 | #if 0 | |
63 | /* All the better to debug you with... */ | |
64 | #define static | |
65 | #define inline | |
66 | #endif | |
67 | ||
68 | /* | |
69 | We keep a set of rules for each CPU, so we can avoid write-locking | |
70 | them in the softirq when updating the counters and therefore | |
71 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
72 | context stops packets coming through and allows user context to read | |
73 | the counters or update the rules. | |
74 | ||
1da177e4 LT |
75 | Hence the start of any table is given by get_table() below. */ |
76 | ||
1da177e4 | 77 | /* Returns whether matches rule or not. */ |
022748a9 | 78 | /* Performance critical - called for every packet */ |
9c547959 | 79 | static inline bool |
1da177e4 LT |
80 | ip_packet_match(const struct iphdr *ip, |
81 | const char *indev, | |
82 | const char *outdev, | |
83 | const struct ipt_ip *ipinfo, | |
84 | int isfrag) | |
85 | { | |
86 | size_t i; | |
87 | unsigned long ret; | |
88 | ||
e79ec50b | 89 | #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) |
1da177e4 LT |
90 | |
91 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, | |
92 | IPT_INV_SRCIP) | |
93 | || FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, | |
94 | IPT_INV_DSTIP)) { | |
95 | dprintf("Source or dest mismatch.\n"); | |
96 | ||
97 | dprintf("SRC: %u.%u.%u.%u. Mask: %u.%u.%u.%u. Target: %u.%u.%u.%u.%s\n", | |
98 | NIPQUAD(ip->saddr), | |
99 | NIPQUAD(ipinfo->smsk.s_addr), | |
100 | NIPQUAD(ipinfo->src.s_addr), | |
101 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); | |
102 | dprintf("DST: %u.%u.%u.%u Mask: %u.%u.%u.%u Target: %u.%u.%u.%u.%s\n", | |
103 | NIPQUAD(ip->daddr), | |
104 | NIPQUAD(ipinfo->dmsk.s_addr), | |
105 | NIPQUAD(ipinfo->dst.s_addr), | |
106 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); | |
9c547959 | 107 | return false; |
1da177e4 LT |
108 | } |
109 | ||
110 | /* Look for ifname matches; this should unroll nicely. */ | |
111 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
112 | ret |= (((const unsigned long *)indev)[i] | |
113 | ^ ((const unsigned long *)ipinfo->iniface)[i]) | |
114 | & ((const unsigned long *)ipinfo->iniface_mask)[i]; | |
115 | } | |
116 | ||
117 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { | |
118 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
119 | indev, ipinfo->iniface, | |
120 | ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":""); | |
9c547959 | 121 | return false; |
1da177e4 LT |
122 | } |
123 | ||
124 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
125 | ret |= (((const unsigned long *)outdev)[i] | |
126 | ^ ((const unsigned long *)ipinfo->outiface)[i]) | |
127 | & ((const unsigned long *)ipinfo->outiface_mask)[i]; | |
128 | } | |
129 | ||
130 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { | |
131 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
132 | outdev, ipinfo->outiface, | |
133 | ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":""); | |
9c547959 | 134 | return false; |
1da177e4 LT |
135 | } |
136 | ||
137 | /* Check specific protocol */ | |
138 | if (ipinfo->proto | |
139 | && FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { | |
140 | dprintf("Packet protocol %hi does not match %hi.%s\n", | |
141 | ip->protocol, ipinfo->proto, | |
142 | ipinfo->invflags&IPT_INV_PROTO ? " (INV)":""); | |
9c547959 | 143 | return false; |
1da177e4 LT |
144 | } |
145 | ||
146 | /* If we have a fragment rule but the packet is not a fragment | |
147 | * then we return zero */ | |
148 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { | |
149 | dprintf("Fragment rule but not fragment.%s\n", | |
150 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); | |
9c547959 | 151 | return false; |
1da177e4 LT |
152 | } |
153 | ||
9c547959 | 154 | return true; |
1da177e4 LT |
155 | } |
156 | ||
022748a9 | 157 | static bool |
1da177e4 LT |
158 | ip_checkentry(const struct ipt_ip *ip) |
159 | { | |
160 | if (ip->flags & ~IPT_F_MASK) { | |
161 | duprintf("Unknown flag bits set: %08X\n", | |
162 | ip->flags & ~IPT_F_MASK); | |
ccb79bdc | 163 | return false; |
1da177e4 LT |
164 | } |
165 | if (ip->invflags & ~IPT_INV_MASK) { | |
166 | duprintf("Unknown invflag bits set: %08X\n", | |
167 | ip->invflags & ~IPT_INV_MASK); | |
ccb79bdc | 168 | return false; |
1da177e4 | 169 | } |
ccb79bdc | 170 | return true; |
1da177e4 LT |
171 | } |
172 | ||
173 | static unsigned int | |
3db05fea | 174 | ipt_error(struct sk_buff *skb, |
1da177e4 LT |
175 | const struct net_device *in, |
176 | const struct net_device *out, | |
177 | unsigned int hooknum, | |
c4986734 | 178 | const struct xt_target *target, |
fe1cb108 | 179 | const void *targinfo) |
1da177e4 LT |
180 | { |
181 | if (net_ratelimit()) | |
182 | printk("ip_tables: error: `%s'\n", (char *)targinfo); | |
183 | ||
184 | return NF_DROP; | |
185 | } | |
186 | ||
022748a9 DV |
187 | /* Performance critical - called for every packet */ |
188 | static inline bool | |
189 | do_match(struct ipt_entry_match *m, | |
1d93a9cb JE |
190 | const struct sk_buff *skb, |
191 | const struct net_device *in, | |
192 | const struct net_device *out, | |
193 | int offset, | |
194 | bool *hotdrop) | |
1da177e4 LT |
195 | { |
196 | /* Stop iteration if it doesn't match */ | |
1c524830 | 197 | if (!m->u.kernel.match->match(skb, in, out, m->u.kernel.match, m->data, |
c9bdd4b5 | 198 | offset, ip_hdrlen(skb), hotdrop)) |
1d93a9cb | 199 | return true; |
1da177e4 | 200 | else |
1d93a9cb | 201 | return false; |
1da177e4 LT |
202 | } |
203 | ||
022748a9 | 204 | /* Performance critical */ |
1da177e4 LT |
205 | static inline struct ipt_entry * |
206 | get_entry(void *base, unsigned int offset) | |
207 | { | |
208 | return (struct ipt_entry *)(base + offset); | |
209 | } | |
210 | ||
ba9dda3a | 211 | /* All zeroes == unconditional rule. */ |
022748a9 | 212 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
213 | static inline int |
214 | unconditional(const struct ipt_ip *ip) | |
215 | { | |
216 | unsigned int i; | |
217 | ||
218 | for (i = 0; i < sizeof(*ip)/sizeof(__u32); i++) | |
219 | if (((__u32 *)ip)[i]) | |
220 | return 0; | |
221 | ||
222 | return 1; | |
e79ec50b | 223 | #undef FWINV |
ba9dda3a JK |
224 | } |
225 | ||
226 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
227 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
022748a9 | 228 | static const char *const hooknames[] = { |
6e23ae2a PM |
229 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
230 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 231 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
232 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
233 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
234 | }; |
235 | ||
236 | enum nf_ip_trace_comments { | |
237 | NF_IP_TRACE_COMMENT_RULE, | |
238 | NF_IP_TRACE_COMMENT_RETURN, | |
239 | NF_IP_TRACE_COMMENT_POLICY, | |
240 | }; | |
241 | ||
022748a9 | 242 | static const char *const comments[] = { |
ba9dda3a JK |
243 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
244 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
245 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
246 | }; | |
247 | ||
248 | static struct nf_loginfo trace_loginfo = { | |
249 | .type = NF_LOG_TYPE_LOG, | |
250 | .u = { | |
251 | .log = { | |
252 | .level = 4, | |
253 | .logflags = NF_LOG_MASK, | |
254 | }, | |
255 | }, | |
256 | }; | |
257 | ||
022748a9 | 258 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
259 | static inline int |
260 | get_chainname_rulenum(struct ipt_entry *s, struct ipt_entry *e, | |
261 | char *hookname, char **chainname, | |
262 | char **comment, unsigned int *rulenum) | |
263 | { | |
264 | struct ipt_standard_target *t = (void *)ipt_get_target(s); | |
265 | ||
266 | if (strcmp(t->target.u.kernel.target->name, IPT_ERROR_TARGET) == 0) { | |
267 | /* Head of user chain: ERROR target with chainname */ | |
268 | *chainname = t->target.data; | |
269 | (*rulenum) = 0; | |
270 | } else if (s == e) { | |
271 | (*rulenum)++; | |
272 | ||
273 | if (s->target_offset == sizeof(struct ipt_entry) | |
274 | && strcmp(t->target.u.kernel.target->name, | |
275 | IPT_STANDARD_TARGET) == 0 | |
276 | && t->verdict < 0 | |
277 | && unconditional(&s->ip)) { | |
278 | /* Tail of chains: STANDARD target (return/policy) */ | |
279 | *comment = *chainname == hookname | |
280 | ? (char *)comments[NF_IP_TRACE_COMMENT_POLICY] | |
281 | : (char *)comments[NF_IP_TRACE_COMMENT_RETURN]; | |
282 | } | |
283 | return 1; | |
284 | } else | |
285 | (*rulenum)++; | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
290 | static void trace_packet(struct sk_buff *skb, | |
291 | unsigned int hook, | |
292 | const struct net_device *in, | |
293 | const struct net_device *out, | |
ecb6f85e | 294 | const char *tablename, |
ba9dda3a JK |
295 | struct xt_table_info *private, |
296 | struct ipt_entry *e) | |
297 | { | |
298 | void *table_base; | |
299 | struct ipt_entry *root; | |
300 | char *hookname, *chainname, *comment; | |
301 | unsigned int rulenum = 0; | |
302 | ||
303 | table_base = (void *)private->entries[smp_processor_id()]; | |
304 | root = get_entry(table_base, private->hook_entry[hook]); | |
305 | ||
306 | hookname = chainname = (char *)hooknames[hook]; | |
307 | comment = (char *)comments[NF_IP_TRACE_COMMENT_RULE]; | |
308 | ||
309 | IPT_ENTRY_ITERATE(root, | |
310 | private->size - private->hook_entry[hook], | |
311 | get_chainname_rulenum, | |
312 | e, hookname, &chainname, &comment, &rulenum); | |
313 | ||
314 | nf_log_packet(AF_INET, hook, skb, in, out, &trace_loginfo, | |
315 | "TRACE: %s:%s:%s:%u ", | |
316 | tablename, chainname, comment, rulenum); | |
317 | } | |
318 | #endif | |
319 | ||
1da177e4 LT |
320 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
321 | unsigned int | |
3db05fea | 322 | ipt_do_table(struct sk_buff *skb, |
1da177e4 LT |
323 | unsigned int hook, |
324 | const struct net_device *in, | |
325 | const struct net_device *out, | |
e60a13e0 | 326 | struct xt_table *table) |
1da177e4 LT |
327 | { |
328 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); | |
329 | u_int16_t offset; | |
330 | struct iphdr *ip; | |
331 | u_int16_t datalen; | |
cff533ac | 332 | bool hotdrop = false; |
1da177e4 LT |
333 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
334 | unsigned int verdict = NF_DROP; | |
335 | const char *indev, *outdev; | |
336 | void *table_base; | |
337 | struct ipt_entry *e, *back; | |
8311731a | 338 | struct xt_table_info *private; |
1da177e4 LT |
339 | |
340 | /* Initialization */ | |
3db05fea HX |
341 | ip = ip_hdr(skb); |
342 | datalen = skb->len - ip->ihl * 4; | |
1da177e4 LT |
343 | indev = in ? in->name : nulldevname; |
344 | outdev = out ? out->name : nulldevname; | |
345 | /* We handle fragments by dealing with the first fragment as | |
346 | * if it was a normal packet. All other fragments are treated | |
347 | * normally, except that they will NEVER match rules that ask | |
348 | * things we don't know, ie. tcp syn flag or ports). If the | |
349 | * rule is also a fragment-specific rule, non-fragments won't | |
350 | * match it. */ | |
351 | offset = ntohs(ip->frag_off) & IP_OFFSET; | |
352 | ||
353 | read_lock_bh(&table->lock); | |
354 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); | |
8311731a | 355 | private = table->private; |
2e4e6a17 HW |
356 | table_base = (void *)private->entries[smp_processor_id()]; |
357 | e = get_entry(table_base, private->hook_entry[hook]); | |
1da177e4 LT |
358 | |
359 | /* For return from builtin chain */ | |
2e4e6a17 | 360 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
361 | |
362 | do { | |
363 | IP_NF_ASSERT(e); | |
364 | IP_NF_ASSERT(back); | |
1da177e4 LT |
365 | if (ip_packet_match(ip, indev, outdev, &e->ip, offset)) { |
366 | struct ipt_entry_target *t; | |
367 | ||
368 | if (IPT_MATCH_ITERATE(e, do_match, | |
3db05fea | 369 | skb, in, out, |
1da177e4 LT |
370 | offset, &hotdrop) != 0) |
371 | goto no_match; | |
372 | ||
373 | ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1); | |
374 | ||
375 | t = ipt_get_target(e); | |
376 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
377 | |
378 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
379 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
380 | /* The packet is traced: log it */ | |
3db05fea HX |
381 | if (unlikely(skb->nf_trace)) |
382 | trace_packet(skb, hook, in, out, | |
ba9dda3a JK |
383 | table->name, private, e); |
384 | #endif | |
1da177e4 LT |
385 | /* Standard target? */ |
386 | if (!t->u.kernel.target->target) { | |
387 | int v; | |
388 | ||
389 | v = ((struct ipt_standard_target *)t)->verdict; | |
390 | if (v < 0) { | |
391 | /* Pop from stack? */ | |
392 | if (v != IPT_RETURN) { | |
393 | verdict = (unsigned)(-v) - 1; | |
394 | break; | |
395 | } | |
396 | e = back; | |
397 | back = get_entry(table_base, | |
398 | back->comefrom); | |
399 | continue; | |
400 | } | |
05465343 PM |
401 | if (table_base + v != (void *)e + e->next_offset |
402 | && !(e->ip.flags & IPT_F_GOTO)) { | |
1da177e4 LT |
403 | /* Save old back ptr in next entry */ |
404 | struct ipt_entry *next | |
405 | = (void *)e + e->next_offset; | |
406 | next->comefrom | |
407 | = (void *)back - table_base; | |
408 | /* set back pointer to next entry */ | |
409 | back = next; | |
410 | } | |
411 | ||
412 | e = get_entry(table_base, v); | |
413 | } else { | |
414 | /* Targets which reenter must return | |
e905a9ed | 415 | abs. verdicts */ |
1da177e4 LT |
416 | #ifdef CONFIG_NETFILTER_DEBUG |
417 | ((struct ipt_entry *)table_base)->comefrom | |
418 | = 0xeeeeeeec; | |
419 | #endif | |
3db05fea | 420 | verdict = t->u.kernel.target->target(skb, |
1da177e4 LT |
421 | in, out, |
422 | hook, | |
1c524830 | 423 | t->u.kernel.target, |
fe1cb108 | 424 | t->data); |
1da177e4 LT |
425 | |
426 | #ifdef CONFIG_NETFILTER_DEBUG | |
427 | if (((struct ipt_entry *)table_base)->comefrom | |
428 | != 0xeeeeeeec | |
429 | && verdict == IPT_CONTINUE) { | |
430 | printk("Target %s reentered!\n", | |
431 | t->u.kernel.target->name); | |
432 | verdict = NF_DROP; | |
433 | } | |
434 | ((struct ipt_entry *)table_base)->comefrom | |
435 | = 0x57acc001; | |
436 | #endif | |
437 | /* Target might have changed stuff. */ | |
3db05fea HX |
438 | ip = ip_hdr(skb); |
439 | datalen = skb->len - ip->ihl * 4; | |
1da177e4 LT |
440 | |
441 | if (verdict == IPT_CONTINUE) | |
442 | e = (void *)e + e->next_offset; | |
443 | else | |
444 | /* Verdict */ | |
445 | break; | |
446 | } | |
447 | } else { | |
448 | ||
449 | no_match: | |
450 | e = (void *)e + e->next_offset; | |
451 | } | |
452 | } while (!hotdrop); | |
453 | ||
1da177e4 LT |
454 | read_unlock_bh(&table->lock); |
455 | ||
456 | #ifdef DEBUG_ALLOW_ALL | |
457 | return NF_ACCEPT; | |
458 | #else | |
459 | if (hotdrop) | |
460 | return NF_DROP; | |
461 | else return verdict; | |
462 | #endif | |
463 | } | |
464 | ||
1da177e4 LT |
465 | /* Figures out from what hook each rule can be called: returns 0 if |
466 | there are loops. Puts hook bitmask in comefrom. */ | |
467 | static int | |
2e4e6a17 | 468 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 469 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
470 | { |
471 | unsigned int hook; | |
472 | ||
473 | /* No recursion; use packet counter to save back ptrs (reset | |
474 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 475 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 476 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 477 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
478 | |
479 | if (!(valid_hooks & (1 << hook))) | |
480 | continue; | |
481 | ||
482 | /* Set initial back pointer. */ | |
483 | e->counters.pcnt = pos; | |
484 | ||
485 | for (;;) { | |
486 | struct ipt_standard_target *t | |
487 | = (void *)ipt_get_target(e); | |
e1b4b9f3 | 488 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 489 | |
6e23ae2a | 490 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
491 | printk("iptables: loop hook %u pos %u %08X.\n", |
492 | hook, pos, e->comefrom); | |
493 | return 0; | |
494 | } | |
9c547959 | 495 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
496 | |
497 | /* Unconditional return/END. */ | |
e1b4b9f3 | 498 | if ((e->target_offset == sizeof(struct ipt_entry) |
1da177e4 LT |
499 | && (strcmp(t->target.u.user.name, |
500 | IPT_STANDARD_TARGET) == 0) | |
501 | && t->verdict < 0 | |
e1b4b9f3 | 502 | && unconditional(&e->ip)) || visited) { |
1da177e4 LT |
503 | unsigned int oldpos, size; |
504 | ||
74c9c0c1 DM |
505 | if (t->verdict < -NF_MAX_VERDICT - 1) { |
506 | duprintf("mark_source_chains: bad " | |
507 | "negative verdict (%i)\n", | |
508 | t->verdict); | |
509 | return 0; | |
510 | } | |
511 | ||
1da177e4 LT |
512 | /* Return: backtrack through the last |
513 | big jump. */ | |
514 | do { | |
6e23ae2a | 515 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
516 | #ifdef DEBUG_IP_FIREWALL_USER |
517 | if (e->comefrom | |
6e23ae2a | 518 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
519 | duprintf("Back unset " |
520 | "on hook %u " | |
521 | "rule %u\n", | |
522 | hook, pos); | |
523 | } | |
524 | #endif | |
525 | oldpos = pos; | |
526 | pos = e->counters.pcnt; | |
527 | e->counters.pcnt = 0; | |
528 | ||
529 | /* We're at the start. */ | |
530 | if (pos == oldpos) | |
531 | goto next; | |
532 | ||
533 | e = (struct ipt_entry *) | |
31836064 | 534 | (entry0 + pos); |
1da177e4 LT |
535 | } while (oldpos == pos + e->next_offset); |
536 | ||
537 | /* Move along one */ | |
538 | size = e->next_offset; | |
539 | e = (struct ipt_entry *) | |
31836064 | 540 | (entry0 + pos + size); |
1da177e4 LT |
541 | e->counters.pcnt = pos; |
542 | pos += size; | |
543 | } else { | |
544 | int newpos = t->verdict; | |
545 | ||
546 | if (strcmp(t->target.u.user.name, | |
547 | IPT_STANDARD_TARGET) == 0 | |
548 | && newpos >= 0) { | |
74c9c0c1 DM |
549 | if (newpos > newinfo->size - |
550 | sizeof(struct ipt_entry)) { | |
551 | duprintf("mark_source_chains: " | |
552 | "bad verdict (%i)\n", | |
553 | newpos); | |
554 | return 0; | |
555 | } | |
1da177e4 LT |
556 | /* This a jump; chase it. */ |
557 | duprintf("Jump rule %u -> %u\n", | |
558 | pos, newpos); | |
559 | } else { | |
560 | /* ... this is a fallthru */ | |
561 | newpos = pos + e->next_offset; | |
562 | } | |
563 | e = (struct ipt_entry *) | |
31836064 | 564 | (entry0 + newpos); |
1da177e4 LT |
565 | e->counters.pcnt = pos; |
566 | pos = newpos; | |
567 | } | |
568 | } | |
569 | next: | |
570 | duprintf("Finished chain %u\n", hook); | |
571 | } | |
572 | return 1; | |
573 | } | |
574 | ||
022748a9 | 575 | static int |
1da177e4 LT |
576 | cleanup_match(struct ipt_entry_match *m, unsigned int *i) |
577 | { | |
578 | if (i && (*i)-- == 0) | |
579 | return 1; | |
580 | ||
581 | if (m->u.kernel.match->destroy) | |
efa74165 | 582 | m->u.kernel.match->destroy(m->u.kernel.match, m->data); |
1da177e4 LT |
583 | module_put(m->u.kernel.match->me); |
584 | return 0; | |
585 | } | |
586 | ||
022748a9 | 587 | static int |
a96be246 DM |
588 | check_entry(struct ipt_entry *e, const char *name) |
589 | { | |
590 | struct ipt_entry_target *t; | |
591 | ||
592 | if (!ip_checkentry(&e->ip)) { | |
593 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
594 | return -EINVAL; | |
595 | } | |
596 | ||
9c547959 PM |
597 | if (e->target_offset + sizeof(struct ipt_entry_target) > |
598 | e->next_offset) | |
a96be246 DM |
599 | return -EINVAL; |
600 | ||
601 | t = ipt_get_target(e); | |
602 | if (e->target_offset + t->u.target_size > e->next_offset) | |
603 | return -EINVAL; | |
604 | ||
605 | return 0; | |
606 | } | |
607 | ||
022748a9 DV |
608 | static int |
609 | check_match(struct ipt_entry_match *m, const char *name, | |
4b478248 PM |
610 | const struct ipt_ip *ip, |
611 | unsigned int hookmask, unsigned int *i) | |
a96be246 | 612 | { |
6709dbbb | 613 | struct xt_match *match; |
a96be246 DM |
614 | int ret; |
615 | ||
616 | match = m->u.kernel.match; | |
617 | ret = xt_check_match(match, AF_INET, m->u.match_size - sizeof(*m), | |
618 | name, hookmask, ip->proto, | |
619 | ip->invflags & IPT_INV_PROTO); | |
620 | if (!ret && m->u.kernel.match->checkentry | |
621 | && !m->u.kernel.match->checkentry(name, ip, match, m->data, | |
622 | hookmask)) { | |
623 | duprintf("ip_tables: check failed for `%s'.\n", | |
624 | m->u.kernel.match->name); | |
625 | ret = -EINVAL; | |
626 | } | |
4c1b52bc DM |
627 | if (!ret) |
628 | (*i)++; | |
a96be246 DM |
629 | return ret; |
630 | } | |
631 | ||
022748a9 | 632 | static int |
a96be246 | 633 | find_check_match(struct ipt_entry_match *m, |
4b478248 PM |
634 | const char *name, |
635 | const struct ipt_ip *ip, | |
636 | unsigned int hookmask, | |
637 | unsigned int *i) | |
1da177e4 | 638 | { |
6709dbbb | 639 | struct xt_match *match; |
3cdc7c95 | 640 | int ret; |
1da177e4 | 641 | |
2e4e6a17 | 642 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, |
9c547959 | 643 | m->u.user.revision), |
1da177e4 LT |
644 | "ipt_%s", m->u.user.name); |
645 | if (IS_ERR(match) || !match) { | |
a96be246 | 646 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
1da177e4 LT |
647 | return match ? PTR_ERR(match) : -ENOENT; |
648 | } | |
649 | m->u.kernel.match = match; | |
650 | ||
4c1b52bc | 651 | ret = check_match(m, name, ip, hookmask, i); |
3cdc7c95 PM |
652 | if (ret) |
653 | goto err; | |
654 | ||
1da177e4 | 655 | return 0; |
3cdc7c95 PM |
656 | err: |
657 | module_put(m->u.kernel.match->me); | |
658 | return ret; | |
1da177e4 LT |
659 | } |
660 | ||
022748a9 | 661 | static int check_target(struct ipt_entry *e, const char *name) |
a96be246 | 662 | { |
e905a9ed | 663 | struct ipt_entry_target *t; |
6709dbbb | 664 | struct xt_target *target; |
e905a9ed | 665 | int ret; |
a96be246 DM |
666 | |
667 | t = ipt_get_target(e); | |
668 | target = t->u.kernel.target; | |
669 | ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t), | |
670 | name, e->comefrom, e->ip.proto, | |
671 | e->ip.invflags & IPT_INV_PROTO); | |
672 | if (!ret && t->u.kernel.target->checkentry | |
4b478248 PM |
673 | && !t->u.kernel.target->checkentry(name, e, target, t->data, |
674 | e->comefrom)) { | |
a96be246 DM |
675 | duprintf("ip_tables: check failed for `%s'.\n", |
676 | t->u.kernel.target->name); | |
677 | ret = -EINVAL; | |
678 | } | |
679 | return ret; | |
680 | } | |
1da177e4 | 681 | |
022748a9 | 682 | static int |
a96be246 | 683 | find_check_entry(struct ipt_entry *e, const char *name, unsigned int size, |
4b478248 | 684 | unsigned int *i) |
1da177e4 LT |
685 | { |
686 | struct ipt_entry_target *t; | |
6709dbbb | 687 | struct xt_target *target; |
1da177e4 LT |
688 | int ret; |
689 | unsigned int j; | |
690 | ||
a96be246 DM |
691 | ret = check_entry(e, name); |
692 | if (ret) | |
693 | return ret; | |
590bdf7f | 694 | |
1da177e4 | 695 | j = 0; |
a96be246 | 696 | ret = IPT_MATCH_ITERATE(e, find_check_match, name, &e->ip, |
4b478248 | 697 | e->comefrom, &j); |
1da177e4 LT |
698 | if (ret != 0) |
699 | goto cleanup_matches; | |
700 | ||
701 | t = ipt_get_target(e); | |
2e4e6a17 | 702 | target = try_then_request_module(xt_find_target(AF_INET, |
4b478248 PM |
703 | t->u.user.name, |
704 | t->u.user.revision), | |
1da177e4 LT |
705 | "ipt_%s", t->u.user.name); |
706 | if (IS_ERR(target) || !target) { | |
a96be246 | 707 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
1da177e4 LT |
708 | ret = target ? PTR_ERR(target) : -ENOENT; |
709 | goto cleanup_matches; | |
710 | } | |
711 | t->u.kernel.target = target; | |
712 | ||
a96be246 | 713 | ret = check_target(e, name); |
3cdc7c95 PM |
714 | if (ret) |
715 | goto err; | |
716 | ||
1da177e4 LT |
717 | (*i)++; |
718 | return 0; | |
3cdc7c95 PM |
719 | err: |
720 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
721 | cleanup_matches: |
722 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
723 | return ret; | |
724 | } | |
725 | ||
022748a9 | 726 | static int |
1da177e4 | 727 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 728 | struct xt_table_info *newinfo, |
1da177e4 LT |
729 | unsigned char *base, |
730 | unsigned char *limit, | |
731 | const unsigned int *hook_entries, | |
732 | const unsigned int *underflows, | |
733 | unsigned int *i) | |
734 | { | |
735 | unsigned int h; | |
736 | ||
737 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 | |
738 | || (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { | |
739 | duprintf("Bad offset %p\n", e); | |
740 | return -EINVAL; | |
741 | } | |
742 | ||
743 | if (e->next_offset | |
744 | < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) { | |
745 | duprintf("checking: element %p size %u\n", | |
746 | e, e->next_offset); | |
747 | return -EINVAL; | |
748 | } | |
749 | ||
750 | /* Check hooks & underflows */ | |
6e23ae2a | 751 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
1da177e4 LT |
752 | if ((unsigned char *)e - base == hook_entries[h]) |
753 | newinfo->hook_entry[h] = hook_entries[h]; | |
754 | if ((unsigned char *)e - base == underflows[h]) | |
755 | newinfo->underflow[h] = underflows[h]; | |
756 | } | |
757 | ||
758 | /* FIXME: underflows must be unconditional, standard verdicts | |
e905a9ed | 759 | < 0 (not IPT_RETURN). --RR */ |
1da177e4 LT |
760 | |
761 | /* Clear counters and comefrom */ | |
2e4e6a17 | 762 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
763 | e->comefrom = 0; |
764 | ||
765 | (*i)++; | |
766 | return 0; | |
767 | } | |
768 | ||
022748a9 | 769 | static int |
1da177e4 LT |
770 | cleanup_entry(struct ipt_entry *e, unsigned int *i) |
771 | { | |
772 | struct ipt_entry_target *t; | |
773 | ||
774 | if (i && (*i)-- == 0) | |
775 | return 1; | |
776 | ||
777 | /* Cleanup all matches */ | |
778 | IPT_MATCH_ITERATE(e, cleanup_match, NULL); | |
779 | t = ipt_get_target(e); | |
780 | if (t->u.kernel.target->destroy) | |
efa74165 | 781 | t->u.kernel.target->destroy(t->u.kernel.target, t->data); |
1da177e4 LT |
782 | module_put(t->u.kernel.target->me); |
783 | return 0; | |
784 | } | |
785 | ||
786 | /* Checks and translates the user-supplied table segment (held in | |
787 | newinfo) */ | |
788 | static int | |
789 | translate_table(const char *name, | |
790 | unsigned int valid_hooks, | |
2e4e6a17 | 791 | struct xt_table_info *newinfo, |
31836064 | 792 | void *entry0, |
1da177e4 LT |
793 | unsigned int size, |
794 | unsigned int number, | |
795 | const unsigned int *hook_entries, | |
796 | const unsigned int *underflows) | |
797 | { | |
798 | unsigned int i; | |
799 | int ret; | |
800 | ||
801 | newinfo->size = size; | |
802 | newinfo->number = number; | |
803 | ||
804 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 805 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
806 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
807 | newinfo->underflow[i] = 0xFFFFFFFF; | |
808 | } | |
809 | ||
810 | duprintf("translate_table: size %u\n", newinfo->size); | |
811 | i = 0; | |
812 | /* Walk through entries, checking offsets. */ | |
31836064 | 813 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
814 | check_entry_size_and_hooks, |
815 | newinfo, | |
31836064 ED |
816 | entry0, |
817 | entry0 + size, | |
1da177e4 LT |
818 | hook_entries, underflows, &i); |
819 | if (ret != 0) | |
820 | return ret; | |
821 | ||
822 | if (i != number) { | |
823 | duprintf("translate_table: %u not %u entries\n", | |
824 | i, number); | |
825 | return -EINVAL; | |
826 | } | |
827 | ||
828 | /* Check hooks all assigned */ | |
6e23ae2a | 829 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
830 | /* Only hooks which are valid */ |
831 | if (!(valid_hooks & (1 << i))) | |
832 | continue; | |
833 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
834 | duprintf("Invalid hook entry %u %u\n", | |
835 | i, hook_entries[i]); | |
836 | return -EINVAL; | |
837 | } | |
838 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
839 | duprintf("Invalid underflow %u %u\n", | |
840 | i, underflows[i]); | |
841 | return -EINVAL; | |
842 | } | |
843 | } | |
844 | ||
74c9c0c1 DM |
845 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
846 | return -ELOOP; | |
847 | ||
1da177e4 LT |
848 | /* Finally, each sanity check must pass */ |
849 | i = 0; | |
31836064 | 850 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
a96be246 | 851 | find_check_entry, name, size, &i); |
1da177e4 | 852 | |
74c9c0c1 DM |
853 | if (ret != 0) { |
854 | IPT_ENTRY_ITERATE(entry0, newinfo->size, | |
855 | cleanup_entry, &i); | |
856 | return ret; | |
857 | } | |
1da177e4 LT |
858 | |
859 | /* And one copy for every other CPU */ | |
6f912042 | 860 | for_each_possible_cpu(i) { |
31836064 ED |
861 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
862 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
863 | } |
864 | ||
865 | return ret; | |
866 | } | |
867 | ||
1da177e4 LT |
868 | /* Gets counters. */ |
869 | static inline int | |
870 | add_entry_to_counter(const struct ipt_entry *e, | |
2e4e6a17 | 871 | struct xt_counters total[], |
1da177e4 LT |
872 | unsigned int *i) |
873 | { | |
874 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
875 | ||
876 | (*i)++; | |
877 | return 0; | |
878 | } | |
879 | ||
31836064 ED |
880 | static inline int |
881 | set_entry_to_counter(const struct ipt_entry *e, | |
882 | struct ipt_counters total[], | |
883 | unsigned int *i) | |
884 | { | |
885 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
886 | ||
887 | (*i)++; | |
888 | return 0; | |
889 | } | |
890 | ||
1da177e4 | 891 | static void |
2e4e6a17 HW |
892 | get_counters(const struct xt_table_info *t, |
893 | struct xt_counters counters[]) | |
1da177e4 LT |
894 | { |
895 | unsigned int cpu; | |
896 | unsigned int i; | |
31836064 ED |
897 | unsigned int curcpu; |
898 | ||
899 | /* Instead of clearing (by a previous call to memset()) | |
900 | * the counters and using adds, we set the counters | |
901 | * with data used by 'current' CPU | |
902 | * We dont care about preemption here. | |
903 | */ | |
904 | curcpu = raw_smp_processor_id(); | |
905 | ||
906 | i = 0; | |
907 | IPT_ENTRY_ITERATE(t->entries[curcpu], | |
908 | t->size, | |
909 | set_entry_to_counter, | |
910 | counters, | |
911 | &i); | |
1da177e4 | 912 | |
6f912042 | 913 | for_each_possible_cpu(cpu) { |
31836064 ED |
914 | if (cpu == curcpu) |
915 | continue; | |
1da177e4 | 916 | i = 0; |
31836064 | 917 | IPT_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
918 | t->size, |
919 | add_entry_to_counter, | |
920 | counters, | |
921 | &i); | |
922 | } | |
923 | } | |
924 | ||
022748a9 | 925 | static struct xt_counters * alloc_counters(struct xt_table *table) |
1da177e4 | 926 | { |
2722971c | 927 | unsigned int countersize; |
2e4e6a17 HW |
928 | struct xt_counters *counters; |
929 | struct xt_table_info *private = table->private; | |
1da177e4 LT |
930 | |
931 | /* We need atomic snapshot of counters: rest doesn't change | |
932 | (other than comefrom, which userspace doesn't care | |
933 | about). */ | |
2e4e6a17 | 934 | countersize = sizeof(struct xt_counters) * private->number; |
31836064 | 935 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
936 | |
937 | if (counters == NULL) | |
2722971c | 938 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
939 | |
940 | /* First, sum counters... */ | |
1da177e4 | 941 | write_lock_bh(&table->lock); |
2e4e6a17 | 942 | get_counters(private, counters); |
1da177e4 LT |
943 | write_unlock_bh(&table->lock); |
944 | ||
2722971c DM |
945 | return counters; |
946 | } | |
947 | ||
948 | static int | |
949 | copy_entries_to_user(unsigned int total_size, | |
e60a13e0 | 950 | struct xt_table *table, |
2722971c DM |
951 | void __user *userptr) |
952 | { | |
953 | unsigned int off, num; | |
954 | struct ipt_entry *e; | |
955 | struct xt_counters *counters; | |
956 | struct xt_table_info *private = table->private; | |
957 | int ret = 0; | |
958 | void *loc_cpu_entry; | |
959 | ||
960 | counters = alloc_counters(table); | |
961 | if (IS_ERR(counters)) | |
962 | return PTR_ERR(counters); | |
963 | ||
31836064 ED |
964 | /* choose the copy that is on our node/cpu, ... |
965 | * This choice is lazy (because current thread is | |
966 | * allowed to migrate to another cpu) | |
967 | */ | |
2e4e6a17 | 968 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 969 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
970 | ret = -EFAULT; |
971 | goto free_counters; | |
972 | } | |
973 | ||
974 | /* FIXME: use iterator macros --RR */ | |
975 | /* ... then go back and fix counters and names */ | |
976 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
977 | unsigned int i; | |
978 | struct ipt_entry_match *m; | |
979 | struct ipt_entry_target *t; | |
980 | ||
31836064 | 981 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
982 | if (copy_to_user(userptr + off |
983 | + offsetof(struct ipt_entry, counters), | |
984 | &counters[num], | |
985 | sizeof(counters[num])) != 0) { | |
986 | ret = -EFAULT; | |
987 | goto free_counters; | |
988 | } | |
989 | ||
990 | for (i = sizeof(struct ipt_entry); | |
991 | i < e->target_offset; | |
992 | i += m->u.match_size) { | |
993 | m = (void *)e + i; | |
994 | ||
995 | if (copy_to_user(userptr + off + i | |
996 | + offsetof(struct ipt_entry_match, | |
997 | u.user.name), | |
998 | m->u.kernel.match->name, | |
999 | strlen(m->u.kernel.match->name)+1) | |
1000 | != 0) { | |
1001 | ret = -EFAULT; | |
1002 | goto free_counters; | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | t = ipt_get_target(e); | |
1007 | if (copy_to_user(userptr + off + e->target_offset | |
1008 | + offsetof(struct ipt_entry_target, | |
1009 | u.user.name), | |
1010 | t->u.kernel.target->name, | |
1011 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1012 | ret = -EFAULT; | |
1013 | goto free_counters; | |
1014 | } | |
1015 | } | |
1016 | ||
1017 | free_counters: | |
1018 | vfree(counters); | |
1019 | return ret; | |
1020 | } | |
1021 | ||
2722971c | 1022 | #ifdef CONFIG_COMPAT |
9fa492cd | 1023 | static void compat_standard_from_user(void *dst, void *src) |
2722971c | 1024 | { |
9fa492cd | 1025 | int v = *(compat_int_t *)src; |
2722971c | 1026 | |
9fa492cd | 1027 | if (v > 0) |
b386d9f5 | 1028 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1029 | memcpy(dst, &v, sizeof(v)); |
1030 | } | |
46c5ea3c | 1031 | |
9fa492cd | 1032 | static int compat_standard_to_user(void __user *dst, void *src) |
2722971c | 1033 | { |
9fa492cd | 1034 | compat_int_t cv = *(int *)src; |
2722971c | 1035 | |
9fa492cd | 1036 | if (cv > 0) |
b386d9f5 | 1037 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1038 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1039 | } |
1040 | ||
1041 | static inline int | |
4b478248 | 1042 | compat_calc_match(struct ipt_entry_match *m, int *size) |
2722971c | 1043 | { |
9fa492cd | 1044 | *size += xt_compat_match_offset(m->u.kernel.match); |
2722971c DM |
1045 | return 0; |
1046 | } | |
1047 | ||
259d4e41 | 1048 | static int compat_calc_entry(struct ipt_entry *e, |
4b478248 PM |
1049 | const struct xt_table_info *info, |
1050 | void *base, struct xt_table_info *newinfo) | |
2722971c DM |
1051 | { |
1052 | struct ipt_entry_target *t; | |
e5b5ef7d | 1053 | unsigned int entry_offset; |
2722971c DM |
1054 | int off, i, ret; |
1055 | ||
30c08c41 | 1056 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1057 | entry_offset = (void *)e - base; |
1058 | IPT_MATCH_ITERATE(e, compat_calc_match, &off); | |
1059 | t = ipt_get_target(e); | |
9fa492cd | 1060 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1061 | newinfo->size -= off; |
b386d9f5 | 1062 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1063 | if (ret) |
1064 | return ret; | |
1065 | ||
6e23ae2a | 1066 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1067 | if (info->hook_entry[i] && |
1068 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1069 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1070 | if (info->underflow[i] && |
1071 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1072 | newinfo->underflow[i] -= off; |
1073 | } | |
1074 | return 0; | |
1075 | } | |
1076 | ||
259d4e41 | 1077 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1078 | struct xt_table_info *newinfo) |
2722971c DM |
1079 | { |
1080 | void *loc_cpu_entry; | |
2722971c DM |
1081 | |
1082 | if (!newinfo || !info) | |
1083 | return -EINVAL; | |
1084 | ||
259d4e41 ED |
1085 | /* we dont care about newinfo->entries[] */ |
1086 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1087 | newinfo->initial_entries = 0; | |
2722971c DM |
1088 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
1089 | return IPT_ENTRY_ITERATE(loc_cpu_entry, info->size, | |
4b478248 PM |
1090 | compat_calc_entry, info, loc_cpu_entry, |
1091 | newinfo); | |
2722971c DM |
1092 | } |
1093 | #endif | |
1094 | ||
34bd137b | 1095 | static int get_info(struct net *net, void __user *user, int *len, int compat) |
2722971c DM |
1096 | { |
1097 | char name[IPT_TABLE_MAXNAMELEN]; | |
e60a13e0 | 1098 | struct xt_table *t; |
2722971c DM |
1099 | int ret; |
1100 | ||
1101 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1102 | duprintf("length %u != %zu\n", *len, |
1103 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1104 | return -EINVAL; |
1105 | } | |
1106 | ||
1107 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1108 | return -EFAULT; | |
1109 | ||
1110 | name[IPT_TABLE_MAXNAMELEN-1] = '\0'; | |
1111 | #ifdef CONFIG_COMPAT | |
1112 | if (compat) | |
1113 | xt_compat_lock(AF_INET); | |
1114 | #endif | |
34bd137b | 1115 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1116 | "iptable_%s", name); |
2722971c DM |
1117 | if (t && !IS_ERR(t)) { |
1118 | struct ipt_getinfo info; | |
1119 | struct xt_table_info *private = t->private; | |
1120 | ||
1121 | #ifdef CONFIG_COMPAT | |
1122 | if (compat) { | |
1123 | struct xt_table_info tmp; | |
1124 | ret = compat_table_info(private, &tmp); | |
b386d9f5 | 1125 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1126 | private = &tmp; |
2722971c DM |
1127 | } |
1128 | #endif | |
1129 | info.valid_hooks = t->valid_hooks; | |
1130 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1131 | sizeof(info.hook_entry)); |
2722971c | 1132 | memcpy(info.underflow, private->underflow, |
4b478248 | 1133 | sizeof(info.underflow)); |
2722971c DM |
1134 | info.num_entries = private->number; |
1135 | info.size = private->size; | |
1136 | strcpy(info.name, name); | |
1137 | ||
1138 | if (copy_to_user(user, &info, *len) != 0) | |
1139 | ret = -EFAULT; | |
1140 | else | |
1141 | ret = 0; | |
1142 | ||
1143 | xt_table_unlock(t); | |
1144 | module_put(t->me); | |
1145 | } else | |
1146 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1147 | #ifdef CONFIG_COMPAT | |
1148 | if (compat) | |
1149 | xt_compat_unlock(AF_INET); | |
1150 | #endif | |
1151 | return ret; | |
1152 | } | |
1153 | ||
1154 | static int | |
34bd137b | 1155 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, int *len) |
2722971c DM |
1156 | { |
1157 | int ret; | |
1158 | struct ipt_get_entries get; | |
e60a13e0 | 1159 | struct xt_table *t; |
2722971c DM |
1160 | |
1161 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1162 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1163 | return -EINVAL; |
1164 | } | |
1165 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1166 | return -EFAULT; | |
1167 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1168 | duprintf("get_entries: %u != %zu\n", |
1169 | *len, sizeof(get) + get.size); | |
2722971c DM |
1170 | return -EINVAL; |
1171 | } | |
1172 | ||
34bd137b | 1173 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c DM |
1174 | if (t && !IS_ERR(t)) { |
1175 | struct xt_table_info *private = t->private; | |
9c547959 | 1176 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1177 | if (get.size == private->size) |
1178 | ret = copy_entries_to_user(private->size, | |
1179 | t, uptr->entrytable); | |
1180 | else { | |
1181 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1182 | private->size, get.size); |
2722971c DM |
1183 | ret = -EINVAL; |
1184 | } | |
1185 | module_put(t->me); | |
1186 | xt_table_unlock(t); | |
1187 | } else | |
1188 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1189 | ||
1190 | return ret; | |
1191 | } | |
1192 | ||
1193 | static int | |
34bd137b | 1194 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1195 | struct xt_table_info *newinfo, unsigned int num_counters, |
1196 | void __user *counters_ptr) | |
2722971c DM |
1197 | { |
1198 | int ret; | |
e60a13e0 | 1199 | struct xt_table *t; |
2722971c DM |
1200 | struct xt_table_info *oldinfo; |
1201 | struct xt_counters *counters; | |
1202 | void *loc_cpu_old_entry; | |
1203 | ||
1204 | ret = 0; | |
1205 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); | |
1206 | if (!counters) { | |
1207 | ret = -ENOMEM; | |
1208 | goto out; | |
1209 | } | |
1210 | ||
34bd137b | 1211 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c DM |
1212 | "iptable_%s", name); |
1213 | if (!t || IS_ERR(t)) { | |
1214 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1215 | goto free_newinfo_counters_untrans; | |
1216 | } | |
1217 | ||
1218 | /* You lied! */ | |
1219 | if (valid_hooks != t->valid_hooks) { | |
1220 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1221 | valid_hooks, t->valid_hooks); | |
1222 | ret = -EINVAL; | |
1223 | goto put_module; | |
1224 | } | |
1225 | ||
1226 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1227 | if (!oldinfo) | |
1228 | goto put_module; | |
1229 | ||
1230 | /* Update module usage count based on number of rules */ | |
1231 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1232 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1233 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1234 | (newinfo->number <= oldinfo->initial_entries)) | |
1235 | module_put(t->me); | |
1236 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1237 | (newinfo->number <= oldinfo->initial_entries)) | |
1238 | module_put(t->me); | |
1239 | ||
1240 | /* Get the old counters. */ | |
1241 | get_counters(oldinfo, counters); | |
1242 | /* Decrease module usage counts and free resource */ | |
1243 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
4b478248 PM |
1244 | IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry, |
1245 | NULL); | |
2722971c DM |
1246 | xt_free_table_info(oldinfo); |
1247 | if (copy_to_user(counters_ptr, counters, | |
1248 | sizeof(struct xt_counters) * num_counters) != 0) | |
1249 | ret = -EFAULT; | |
1250 | vfree(counters); | |
1251 | xt_table_unlock(t); | |
1252 | return ret; | |
1253 | ||
1254 | put_module: | |
1255 | module_put(t->me); | |
1256 | xt_table_unlock(t); | |
1257 | free_newinfo_counters_untrans: | |
1258 | vfree(counters); | |
1259 | out: | |
1260 | return ret; | |
1261 | } | |
1262 | ||
1263 | static int | |
34bd137b | 1264 | do_replace(struct net *net, void __user *user, unsigned int len) |
2722971c DM |
1265 | { |
1266 | int ret; | |
1267 | struct ipt_replace tmp; | |
1268 | struct xt_table_info *newinfo; | |
1269 | void *loc_cpu_entry; | |
1270 | ||
1271 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1272 | return -EFAULT; | |
1273 | ||
2722971c | 1274 | /* overflow check */ |
2722971c DM |
1275 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1276 | return -ENOMEM; | |
1277 | ||
1278 | newinfo = xt_alloc_table_info(tmp.size); | |
1279 | if (!newinfo) | |
1280 | return -ENOMEM; | |
1281 | ||
9c547959 | 1282 | /* choose the copy that is on our node/cpu */ |
2722971c DM |
1283 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1284 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1285 | tmp.size) != 0) { | |
1286 | ret = -EFAULT; | |
1287 | goto free_newinfo; | |
1288 | } | |
1289 | ||
1290 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
1291 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, | |
1292 | tmp.hook_entry, tmp.underflow); | |
1293 | if (ret != 0) | |
1294 | goto free_newinfo; | |
1295 | ||
1296 | duprintf("ip_tables: Translated table\n"); | |
1297 | ||
34bd137b | 1298 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1299 | tmp.num_counters, tmp.counters); |
2722971c DM |
1300 | if (ret) |
1301 | goto free_newinfo_untrans; | |
1302 | return 0; | |
1303 | ||
1304 | free_newinfo_untrans: | |
9c547959 | 1305 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
2722971c DM |
1306 | free_newinfo: |
1307 | xt_free_table_info(newinfo); | |
1308 | return ret; | |
1309 | } | |
1310 | ||
1311 | /* We're lazy, and add to the first CPU; overflow works its fey magic | |
1312 | * and everything is OK. */ | |
022748a9 | 1313 | static int |
2722971c DM |
1314 | add_counter_to_entry(struct ipt_entry *e, |
1315 | const struct xt_counters addme[], | |
1316 | unsigned int *i) | |
1317 | { | |
1318 | #if 0 | |
1319 | duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n", | |
1320 | *i, | |
1321 | (long unsigned int)e->counters.pcnt, | |
1322 | (long unsigned int)e->counters.bcnt, | |
1323 | (long unsigned int)addme[*i].pcnt, | |
1324 | (long unsigned int)addme[*i].bcnt); | |
1325 | #endif | |
1326 | ||
1327 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1328 | ||
1329 | (*i)++; | |
1330 | return 0; | |
1331 | } | |
1332 | ||
1333 | static int | |
34bd137b | 1334 | do_add_counters(struct net *net, void __user *user, unsigned int len, int compat) |
2722971c DM |
1335 | { |
1336 | unsigned int i; | |
1337 | struct xt_counters_info tmp; | |
1338 | struct xt_counters *paddc; | |
1339 | unsigned int num_counters; | |
1340 | char *name; | |
1341 | int size; | |
1342 | void *ptmp; | |
e60a13e0 | 1343 | struct xt_table *t; |
2722971c DM |
1344 | struct xt_table_info *private; |
1345 | int ret = 0; | |
1346 | void *loc_cpu_entry; | |
1347 | #ifdef CONFIG_COMPAT | |
1348 | struct compat_xt_counters_info compat_tmp; | |
1349 | ||
1350 | if (compat) { | |
1351 | ptmp = &compat_tmp; | |
1352 | size = sizeof(struct compat_xt_counters_info); | |
1353 | } else | |
1354 | #endif | |
1355 | { | |
1356 | ptmp = &tmp; | |
1357 | size = sizeof(struct xt_counters_info); | |
1358 | } | |
1359 | ||
1360 | if (copy_from_user(ptmp, user, size) != 0) | |
1361 | return -EFAULT; | |
1362 | ||
1363 | #ifdef CONFIG_COMPAT | |
1364 | if (compat) { | |
1365 | num_counters = compat_tmp.num_counters; | |
1366 | name = compat_tmp.name; | |
1367 | } else | |
1368 | #endif | |
1369 | { | |
1370 | num_counters = tmp.num_counters; | |
1371 | name = tmp.name; | |
1372 | } | |
1373 | ||
1374 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1375 | return -EINVAL; | |
1376 | ||
1377 | paddc = vmalloc_node(len - size, numa_node_id()); | |
1378 | if (!paddc) | |
1379 | return -ENOMEM; | |
1380 | ||
1381 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1382 | ret = -EFAULT; | |
1383 | goto free; | |
1384 | } | |
1385 | ||
34bd137b | 1386 | t = xt_find_table_lock(net, AF_INET, name); |
2722971c DM |
1387 | if (!t || IS_ERR(t)) { |
1388 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1389 | goto free; | |
1390 | } | |
1391 | ||
1392 | write_lock_bh(&t->lock); | |
1393 | private = t->private; | |
1394 | if (private->number != num_counters) { | |
1395 | ret = -EINVAL; | |
1396 | goto unlock_up_free; | |
1397 | } | |
1398 | ||
1399 | i = 0; | |
1400 | /* Choose the copy that is on our node */ | |
1401 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1402 | IPT_ENTRY_ITERATE(loc_cpu_entry, | |
1403 | private->size, | |
1404 | add_counter_to_entry, | |
1405 | paddc, | |
1406 | &i); | |
1407 | unlock_up_free: | |
1408 | write_unlock_bh(&t->lock); | |
1409 | xt_table_unlock(t); | |
1410 | module_put(t->me); | |
1411 | free: | |
1412 | vfree(paddc); | |
1413 | ||
1414 | return ret; | |
1415 | } | |
1416 | ||
1417 | #ifdef CONFIG_COMPAT | |
1418 | struct compat_ipt_replace { | |
1419 | char name[IPT_TABLE_MAXNAMELEN]; | |
1420 | u32 valid_hooks; | |
1421 | u32 num_entries; | |
1422 | u32 size; | |
6e23ae2a PM |
1423 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1424 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c DM |
1425 | u32 num_counters; |
1426 | compat_uptr_t counters; /* struct ipt_counters * */ | |
1427 | struct compat_ipt_entry entries[0]; | |
1428 | }; | |
1429 | ||
a18aa31b PM |
1430 | static int |
1431 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1432 | unsigned int *size, struct xt_counters *counters, |
a18aa31b | 1433 | unsigned int *i) |
2722971c | 1434 | { |
3e597c60 | 1435 | struct ipt_entry_target *t; |
2722971c DM |
1436 | struct compat_ipt_entry __user *ce; |
1437 | u_int16_t target_offset, next_offset; | |
1438 | compat_uint_t origsize; | |
1439 | int ret; | |
1440 | ||
1441 | ret = -EFAULT; | |
1442 | origsize = *size; | |
1443 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
7800007c | 1444 | if (copy_to_user(ce, e, sizeof(struct ipt_entry))) |
2722971c DM |
1445 | goto out; |
1446 | ||
a18aa31b PM |
1447 | if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i]))) |
1448 | goto out; | |
1449 | ||
2722971c | 1450 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1451 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1452 | ||
ac8e27fd | 1453 | ret = IPT_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size); |
2722971c DM |
1454 | target_offset = e->target_offset - (origsize - *size); |
1455 | if (ret) | |
1456 | goto out; | |
1457 | t = ipt_get_target(e); | |
9fa492cd | 1458 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c DM |
1459 | if (ret) |
1460 | goto out; | |
1461 | ret = -EFAULT; | |
1462 | next_offset = e->next_offset - (origsize - *size); | |
7800007c | 1463 | if (put_user(target_offset, &ce->target_offset)) |
2722971c | 1464 | goto out; |
7800007c | 1465 | if (put_user(next_offset, &ce->next_offset)) |
2722971c | 1466 | goto out; |
a18aa31b PM |
1467 | |
1468 | (*i)++; | |
2722971c DM |
1469 | return 0; |
1470 | out: | |
1471 | return ret; | |
1472 | } | |
1473 | ||
022748a9 | 1474 | static int |
4c1b52bc | 1475 | compat_find_calc_match(struct ipt_entry_match *m, |
4b478248 PM |
1476 | const char *name, |
1477 | const struct ipt_ip *ip, | |
1478 | unsigned int hookmask, | |
b0a6363c | 1479 | int *size, unsigned int *i) |
2722971c | 1480 | { |
6709dbbb | 1481 | struct xt_match *match; |
2722971c DM |
1482 | |
1483 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, | |
4b478248 | 1484 | m->u.user.revision), |
2722971c DM |
1485 | "ipt_%s", m->u.user.name); |
1486 | if (IS_ERR(match) || !match) { | |
1487 | duprintf("compat_check_calc_match: `%s' not found\n", | |
4b478248 | 1488 | m->u.user.name); |
2722971c DM |
1489 | return match ? PTR_ERR(match) : -ENOENT; |
1490 | } | |
1491 | m->u.kernel.match = match; | |
9fa492cd | 1492 | *size += xt_compat_match_offset(match); |
2722971c DM |
1493 | |
1494 | (*i)++; | |
1495 | return 0; | |
1496 | } | |
1497 | ||
022748a9 | 1498 | static int |
4c1b52bc DM |
1499 | compat_release_match(struct ipt_entry_match *m, unsigned int *i) |
1500 | { | |
1501 | if (i && (*i)-- == 0) | |
1502 | return 1; | |
1503 | ||
1504 | module_put(m->u.kernel.match->me); | |
1505 | return 0; | |
1506 | } | |
1507 | ||
022748a9 | 1508 | static int |
73cd598d | 1509 | compat_release_entry(struct compat_ipt_entry *e, unsigned int *i) |
4c1b52bc DM |
1510 | { |
1511 | struct ipt_entry_target *t; | |
1512 | ||
1513 | if (i && (*i)-- == 0) | |
1514 | return 1; | |
1515 | ||
1516 | /* Cleanup all matches */ | |
73cd598d PM |
1517 | COMPAT_IPT_MATCH_ITERATE(e, compat_release_match, NULL); |
1518 | t = compat_ipt_get_target(e); | |
4c1b52bc DM |
1519 | module_put(t->u.kernel.target->me); |
1520 | return 0; | |
1521 | } | |
1522 | ||
022748a9 | 1523 | static int |
73cd598d | 1524 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1525 | struct xt_table_info *newinfo, |
1526 | unsigned int *size, | |
1527 | unsigned char *base, | |
1528 | unsigned char *limit, | |
1529 | unsigned int *hook_entries, | |
1530 | unsigned int *underflows, | |
1531 | unsigned int *i, | |
1532 | const char *name) | |
2722971c DM |
1533 | { |
1534 | struct ipt_entry_target *t; | |
6709dbbb | 1535 | struct xt_target *target; |
e5b5ef7d | 1536 | unsigned int entry_offset; |
b0a6363c PM |
1537 | unsigned int j; |
1538 | int ret, off, h; | |
2722971c DM |
1539 | |
1540 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
1541 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 | |
1542 | || (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { | |
1543 | duprintf("Bad offset %p, limit = %p\n", e, limit); | |
1544 | return -EINVAL; | |
1545 | } | |
1546 | ||
1547 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1548 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1549 | duprintf("checking: element %p size %u\n", |
1550 | e, e->next_offset); | |
1551 | return -EINVAL; | |
1552 | } | |
1553 | ||
73cd598d PM |
1554 | /* For purposes of check_entry casting the compat entry is fine */ |
1555 | ret = check_entry((struct ipt_entry *)e, name); | |
a96be246 DM |
1556 | if (ret) |
1557 | return ret; | |
590bdf7f | 1558 | |
30c08c41 | 1559 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1560 | entry_offset = (void *)e - (void *)base; |
1561 | j = 0; | |
73cd598d PM |
1562 | ret = COMPAT_IPT_MATCH_ITERATE(e, compat_find_calc_match, name, |
1563 | &e->ip, e->comefrom, &off, &j); | |
2722971c | 1564 | if (ret != 0) |
4c1b52bc | 1565 | goto release_matches; |
2722971c | 1566 | |
73cd598d | 1567 | t = compat_ipt_get_target(e); |
2722971c | 1568 | target = try_then_request_module(xt_find_target(AF_INET, |
4b478248 PM |
1569 | t->u.user.name, |
1570 | t->u.user.revision), | |
2722971c DM |
1571 | "ipt_%s", t->u.user.name); |
1572 | if (IS_ERR(target) || !target) { | |
a96be246 | 1573 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1574 | t->u.user.name); |
2722971c | 1575 | ret = target ? PTR_ERR(target) : -ENOENT; |
4c1b52bc | 1576 | goto release_matches; |
2722971c DM |
1577 | } |
1578 | t->u.kernel.target = target; | |
1579 | ||
9fa492cd | 1580 | off += xt_compat_target_offset(target); |
2722971c | 1581 | *size += off; |
b386d9f5 | 1582 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1583 | if (ret) |
1584 | goto out; | |
1585 | ||
1586 | /* Check hooks & underflows */ | |
6e23ae2a | 1587 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1588 | if ((unsigned char *)e - base == hook_entries[h]) |
1589 | newinfo->hook_entry[h] = hook_entries[h]; | |
1590 | if ((unsigned char *)e - base == underflows[h]) | |
1591 | newinfo->underflow[h] = underflows[h]; | |
1592 | } | |
1593 | ||
1594 | /* Clear counters and comefrom */ | |
73cd598d | 1595 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c DM |
1596 | e->comefrom = 0; |
1597 | ||
1598 | (*i)++; | |
1599 | return 0; | |
bec71b16 | 1600 | |
2722971c | 1601 | out: |
bec71b16 | 1602 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1603 | release_matches: |
1604 | IPT_MATCH_ITERATE(e, compat_release_match, &j); | |
2722971c DM |
1605 | return ret; |
1606 | } | |
1607 | ||
4b478248 | 1608 | static int |
73cd598d | 1609 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1610 | unsigned int *size, const char *name, |
1611 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c DM |
1612 | { |
1613 | struct ipt_entry_target *t; | |
6709dbbb | 1614 | struct xt_target *target; |
2722971c DM |
1615 | struct ipt_entry *de; |
1616 | unsigned int origsize; | |
920b868a | 1617 | int ret, h; |
2722971c DM |
1618 | |
1619 | ret = 0; | |
1620 | origsize = *size; | |
1621 | de = (struct ipt_entry *)*dstptr; | |
1622 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1623 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1624 | |
73cd598d | 1625 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1626 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1627 | ||
73cd598d PM |
1628 | ret = COMPAT_IPT_MATCH_ITERATE(e, xt_compat_match_from_user, |
1629 | dstptr, size); | |
2722971c | 1630 | if (ret) |
f6677f43 | 1631 | return ret; |
2722971c | 1632 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1633 | t = compat_ipt_get_target(e); |
2722971c | 1634 | target = t->u.kernel.target; |
9fa492cd | 1635 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1636 | |
1637 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1638 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1639 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1640 | newinfo->hook_entry[h] -= origsize - *size; | |
1641 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1642 | newinfo->underflow[h] -= origsize - *size; | |
1643 | } | |
f6677f43 DM |
1644 | return ret; |
1645 | } | |
1646 | ||
022748a9 DV |
1647 | static int |
1648 | compat_check_entry(struct ipt_entry *e, const char *name, | |
4b478248 | 1649 | unsigned int *i) |
f6677f43 | 1650 | { |
b0a6363c PM |
1651 | unsigned int j; |
1652 | int ret; | |
f6677f43 | 1653 | |
4c1b52bc | 1654 | j = 0; |
9c547959 PM |
1655 | ret = IPT_MATCH_ITERATE(e, check_match, name, &e->ip, |
1656 | e->comefrom, &j); | |
f6677f43 | 1657 | if (ret) |
4c1b52bc DM |
1658 | goto cleanup_matches; |
1659 | ||
1660 | ret = check_target(e, name); | |
1661 | if (ret) | |
1662 | goto cleanup_matches; | |
f6677f43 | 1663 | |
4c1b52bc DM |
1664 | (*i)++; |
1665 | return 0; | |
1666 | ||
1667 | cleanup_matches: | |
1668 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
1669 | return ret; | |
f6677f43 DM |
1670 | } |
1671 | ||
1da177e4 | 1672 | static int |
2722971c | 1673 | translate_compat_table(const char *name, |
4b478248 PM |
1674 | unsigned int valid_hooks, |
1675 | struct xt_table_info **pinfo, | |
1676 | void **pentry0, | |
1677 | unsigned int total_size, | |
1678 | unsigned int number, | |
1679 | unsigned int *hook_entries, | |
1680 | unsigned int *underflows) | |
1da177e4 | 1681 | { |
920b868a | 1682 | unsigned int i, j; |
2722971c DM |
1683 | struct xt_table_info *newinfo, *info; |
1684 | void *pos, *entry0, *entry1; | |
1685 | unsigned int size; | |
1da177e4 | 1686 | int ret; |
1da177e4 | 1687 | |
2722971c DM |
1688 | info = *pinfo; |
1689 | entry0 = *pentry0; | |
1690 | size = total_size; | |
1691 | info->number = number; | |
1692 | ||
1693 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1694 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1695 | info->hook_entry[i] = 0xFFFFFFFF; |
1696 | info->underflow[i] = 0xFFFFFFFF; | |
1697 | } | |
1698 | ||
1699 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1700 | j = 0; |
2722971c DM |
1701 | xt_compat_lock(AF_INET); |
1702 | /* Walk through entries, checking offsets. */ | |
73cd598d PM |
1703 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
1704 | check_compat_entry_size_and_hooks, | |
1705 | info, &size, entry0, | |
1706 | entry0 + total_size, | |
1707 | hook_entries, underflows, &j, name); | |
2722971c DM |
1708 | if (ret != 0) |
1709 | goto out_unlock; | |
1710 | ||
1711 | ret = -EINVAL; | |
920b868a | 1712 | if (j != number) { |
2722971c | 1713 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1714 | j, number); |
2722971c DM |
1715 | goto out_unlock; |
1716 | } | |
1717 | ||
1718 | /* Check hooks all assigned */ | |
6e23ae2a | 1719 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1720 | /* Only hooks which are valid */ |
1721 | if (!(valid_hooks & (1 << i))) | |
1722 | continue; | |
1723 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1724 | duprintf("Invalid hook entry %u %u\n", | |
1725 | i, hook_entries[i]); | |
1726 | goto out_unlock; | |
1da177e4 | 1727 | } |
2722971c DM |
1728 | if (info->underflow[i] == 0xFFFFFFFF) { |
1729 | duprintf("Invalid underflow %u %u\n", | |
1730 | i, underflows[i]); | |
1731 | goto out_unlock; | |
1732 | } | |
1733 | } | |
1734 | ||
1735 | ret = -ENOMEM; | |
1736 | newinfo = xt_alloc_table_info(size); | |
1737 | if (!newinfo) | |
1738 | goto out_unlock; | |
1739 | ||
1740 | newinfo->number = number; | |
6e23ae2a | 1741 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1742 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1743 | newinfo->underflow[i] = info->underflow[i]; | |
1744 | } | |
1745 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1746 | pos = entry1; | |
4b478248 | 1747 | size = total_size; |
73cd598d | 1748 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
9c547959 PM |
1749 | compat_copy_entry_from_user, |
1750 | &pos, &size, name, newinfo, entry1); | |
b386d9f5 | 1751 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1752 | xt_compat_unlock(AF_INET); |
1753 | if (ret) | |
1754 | goto free_newinfo; | |
1755 | ||
1756 | ret = -ELOOP; | |
1757 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1758 | goto free_newinfo; | |
1759 | ||
4c1b52bc | 1760 | i = 0; |
f6677f43 | 1761 | ret = IPT_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry, |
4b478248 | 1762 | name, &i); |
4c1b52bc DM |
1763 | if (ret) { |
1764 | j -= i; | |
73cd598d PM |
1765 | COMPAT_IPT_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i, |
1766 | compat_release_entry, &j); | |
4c1b52bc DM |
1767 | IPT_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i); |
1768 | xt_free_table_info(newinfo); | |
1769 | return ret; | |
1770 | } | |
f6677f43 | 1771 | |
2722971c | 1772 | /* And one copy for every other CPU */ |
fb1bb34d | 1773 | for_each_possible_cpu(i) |
2722971c DM |
1774 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1775 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1776 | ||
1777 | *pinfo = newinfo; | |
1778 | *pentry0 = entry1; | |
1779 | xt_free_table_info(info); | |
1780 | return 0; | |
1da177e4 | 1781 | |
2722971c DM |
1782 | free_newinfo: |
1783 | xt_free_table_info(newinfo); | |
1784 | out: | |
73cd598d | 1785 | COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j); |
1da177e4 | 1786 | return ret; |
2722971c | 1787 | out_unlock: |
b386d9f5 | 1788 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1789 | xt_compat_unlock(AF_INET); |
1790 | goto out; | |
1da177e4 LT |
1791 | } |
1792 | ||
1793 | static int | |
34bd137b | 1794 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1795 | { |
1796 | int ret; | |
2722971c DM |
1797 | struct compat_ipt_replace tmp; |
1798 | struct xt_table_info *newinfo; | |
1799 | void *loc_cpu_entry; | |
1da177e4 LT |
1800 | |
1801 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1802 | return -EFAULT; | |
1803 | ||
ee4bb818 | 1804 | /* overflow check */ |
259d4e41 | 1805 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1806 | return -ENOMEM; |
1807 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1808 | return -ENOMEM; | |
1809 | ||
2e4e6a17 | 1810 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1811 | if (!newinfo) |
1812 | return -ENOMEM; | |
1813 | ||
9c547959 | 1814 | /* choose the copy that is on our node/cpu */ |
31836064 ED |
1815 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1816 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1817 | tmp.size) != 0) { |
1818 | ret = -EFAULT; | |
1819 | goto free_newinfo; | |
1820 | } | |
1821 | ||
2722971c | 1822 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, |
4b478248 PM |
1823 | &newinfo, &loc_cpu_entry, tmp.size, |
1824 | tmp.num_entries, tmp.hook_entry, | |
1825 | tmp.underflow); | |
2722971c | 1826 | if (ret != 0) |
1da177e4 | 1827 | goto free_newinfo; |
1da177e4 | 1828 | |
2722971c | 1829 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1830 | |
34bd137b | 1831 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1832 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1833 | if (ret) |
1834 | goto free_newinfo_untrans; | |
1835 | return 0; | |
1da177e4 | 1836 | |
2722971c | 1837 | free_newinfo_untrans: |
4b478248 | 1838 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
2722971c DM |
1839 | free_newinfo: |
1840 | xt_free_table_info(newinfo); | |
1841 | return ret; | |
1842 | } | |
1da177e4 | 1843 | |
2722971c DM |
1844 | static int |
1845 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1846 | unsigned int len) |
2722971c DM |
1847 | { |
1848 | int ret; | |
1da177e4 | 1849 | |
2722971c DM |
1850 | if (!capable(CAP_NET_ADMIN)) |
1851 | return -EPERM; | |
1da177e4 | 1852 | |
2722971c DM |
1853 | switch (cmd) { |
1854 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1855 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1856 | break; |
1da177e4 | 1857 | |
2722971c | 1858 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1859 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1860 | break; |
1861 | ||
1862 | default: | |
1863 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1864 | ret = -EINVAL; | |
1865 | } | |
1da177e4 | 1866 | |
1da177e4 LT |
1867 | return ret; |
1868 | } | |
1869 | ||
4b478248 | 1870 | struct compat_ipt_get_entries { |
2722971c DM |
1871 | char name[IPT_TABLE_MAXNAMELEN]; |
1872 | compat_uint_t size; | |
1873 | struct compat_ipt_entry entrytable[0]; | |
1874 | }; | |
1da177e4 | 1875 | |
4b478248 PM |
1876 | static int |
1877 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1878 | void __user *userptr) | |
2722971c | 1879 | { |
2722971c DM |
1880 | struct xt_counters *counters; |
1881 | struct xt_table_info *private = table->private; | |
1882 | void __user *pos; | |
1883 | unsigned int size; | |
1884 | int ret = 0; | |
1885 | void *loc_cpu_entry; | |
a18aa31b | 1886 | unsigned int i = 0; |
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, | |
a18aa31b PM |
1900 | compat_copy_entry_to_user, |
1901 | &pos, &size, counters, &i); | |
2722971c | 1902 | |
2722971c DM |
1903 | vfree(counters); |
1904 | return ret; | |
1da177e4 LT |
1905 | } |
1906 | ||
1907 | static int | |
34bd137b AD |
1908 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1909 | int *len) | |
1da177e4 | 1910 | { |
2722971c DM |
1911 | int ret; |
1912 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1913 | struct xt_table *t; |
1da177e4 | 1914 | |
2722971c | 1915 | if (*len < sizeof(get)) { |
c9d8fe13 | 1916 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1917 | return -EINVAL; |
2722971c | 1918 | } |
1da177e4 | 1919 | |
2722971c DM |
1920 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1921 | return -EFAULT; | |
1da177e4 | 1922 | |
2722971c | 1923 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1924 | duprintf("compat_get_entries: %u != %zu\n", |
1925 | *len, sizeof(get) + get.size); | |
2722971c | 1926 | return -EINVAL; |
1da177e4 LT |
1927 | } |
1928 | ||
2722971c | 1929 | xt_compat_lock(AF_INET); |
34bd137b | 1930 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c DM |
1931 | if (t && !IS_ERR(t)) { |
1932 | struct xt_table_info *private = t->private; | |
1933 | struct xt_table_info info; | |
9c547959 | 1934 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1935 | ret = compat_table_info(private, &info); |
1936 | if (!ret && get.size == info.size) { | |
1937 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 1938 | t, uptr->entrytable); |
2722971c DM |
1939 | } else if (!ret) { |
1940 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1941 | private->size, get.size); |
2722971c DM |
1942 | ret = -EINVAL; |
1943 | } | |
b386d9f5 | 1944 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1945 | module_put(t->me); |
1946 | xt_table_unlock(t); | |
1947 | } else | |
1da177e4 | 1948 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1949 | |
2722971c DM |
1950 | xt_compat_unlock(AF_INET); |
1951 | return ret; | |
1952 | } | |
1da177e4 | 1953 | |
79030ed0 PM |
1954 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1955 | ||
2722971c DM |
1956 | static int |
1957 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1958 | { | |
1959 | int ret; | |
1da177e4 | 1960 | |
82fac054 BS |
1961 | if (!capable(CAP_NET_ADMIN)) |
1962 | return -EPERM; | |
1963 | ||
2722971c DM |
1964 | switch (cmd) { |
1965 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1966 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1967 | break; |
1968 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1969 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1970 | break; |
1971 | default: | |
79030ed0 | 1972 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1973 | } |
1da177e4 LT |
1974 | return ret; |
1975 | } | |
2722971c | 1976 | #endif |
1da177e4 LT |
1977 | |
1978 | static int | |
9c547959 | 1979 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
1980 | { |
1981 | int ret; | |
1982 | ||
1983 | if (!capable(CAP_NET_ADMIN)) | |
1984 | return -EPERM; | |
1985 | ||
1986 | switch (cmd) { | |
1987 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1988 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1989 | break; |
1990 | ||
1991 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1992 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
1993 | break; |
1994 | ||
1995 | default: | |
1996 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1997 | ret = -EINVAL; | |
1998 | } | |
1999 | ||
2000 | return ret; | |
2001 | } | |
2002 | ||
2003 | static int | |
2004 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2005 | { | |
2006 | int ret; | |
2007 | ||
2008 | if (!capable(CAP_NET_ADMIN)) | |
2009 | return -EPERM; | |
2010 | ||
2011 | switch (cmd) { | |
2722971c | 2012 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2013 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2014 | break; |
1da177e4 | 2015 | |
2722971c | 2016 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2017 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2018 | break; |
1da177e4 LT |
2019 | |
2020 | case IPT_SO_GET_REVISION_MATCH: | |
2021 | case IPT_SO_GET_REVISION_TARGET: { | |
2022 | struct ipt_get_revision rev; | |
2e4e6a17 | 2023 | int target; |
1da177e4 LT |
2024 | |
2025 | if (*len != sizeof(rev)) { | |
2026 | ret = -EINVAL; | |
2027 | break; | |
2028 | } | |
2029 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2030 | ret = -EFAULT; | |
2031 | break; | |
2032 | } | |
2033 | ||
2034 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2035 | target = 1; |
1da177e4 | 2036 | else |
2e4e6a17 | 2037 | target = 0; |
1da177e4 | 2038 | |
2e4e6a17 HW |
2039 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2040 | rev.revision, | |
2041 | target, &ret), | |
1da177e4 LT |
2042 | "ipt_%s", rev.name); |
2043 | break; | |
2044 | } | |
2045 | ||
2046 | default: | |
2047 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2048 | ret = -EINVAL; | |
2049 | } | |
2050 | ||
2051 | return ret; | |
2052 | } | |
2053 | ||
44d34e72 AD |
2054 | struct xt_table *ipt_register_table(struct net *net, struct xt_table *table, |
2055 | const struct ipt_replace *repl) | |
1da177e4 LT |
2056 | { |
2057 | int ret; | |
2e4e6a17 | 2058 | struct xt_table_info *newinfo; |
259d4e41 | 2059 | struct xt_table_info bootstrap |
1da177e4 | 2060 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2061 | void *loc_cpu_entry; |
a98da11d | 2062 | struct xt_table *new_table; |
1da177e4 | 2063 | |
2e4e6a17 | 2064 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2065 | if (!newinfo) { |
2066 | ret = -ENOMEM; | |
2067 | goto out; | |
2068 | } | |
1da177e4 | 2069 | |
9c547959 | 2070 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2071 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2072 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
2073 | |
2074 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 2075 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
2076 | repl->num_entries, |
2077 | repl->hook_entry, | |
2078 | repl->underflow); | |
44d34e72 AD |
2079 | if (ret != 0) |
2080 | goto out_free; | |
1da177e4 | 2081 | |
44d34e72 | 2082 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2083 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2084 | ret = PTR_ERR(new_table); |
2085 | goto out_free; | |
1da177e4 LT |
2086 | } |
2087 | ||
44d34e72 AD |
2088 | return new_table; |
2089 | ||
2090 | out_free: | |
2091 | xt_free_table_info(newinfo); | |
2092 | out: | |
2093 | return ERR_PTR(ret); | |
1da177e4 LT |
2094 | } |
2095 | ||
e60a13e0 | 2096 | void ipt_unregister_table(struct xt_table *table) |
1da177e4 | 2097 | { |
2e4e6a17 | 2098 | struct xt_table_info *private; |
31836064 | 2099 | void *loc_cpu_entry; |
df200969 | 2100 | struct module *table_owner = table->me; |
31836064 | 2101 | |
e905a9ed | 2102 | private = xt_unregister_table(table); |
1da177e4 LT |
2103 | |
2104 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
2105 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
2106 | IPT_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
df200969 AD |
2107 | if (private->number > private->initial_entries) |
2108 | module_put(table_owner); | |
2e4e6a17 | 2109 | xt_free_table_info(private); |
1da177e4 LT |
2110 | } |
2111 | ||
2112 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2113 | static inline bool |
1da177e4 LT |
2114 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2115 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2116 | bool invert) |
1da177e4 | 2117 | { |
9c547959 PM |
2118 | return ((test_type == 0xFF) || |
2119 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2120 | ^ invert; |
2121 | } | |
2122 | ||
1d93a9cb | 2123 | static bool |
1da177e4 LT |
2124 | icmp_match(const struct sk_buff *skb, |
2125 | const struct net_device *in, | |
2126 | const struct net_device *out, | |
c4986734 | 2127 | const struct xt_match *match, |
1da177e4 LT |
2128 | const void *matchinfo, |
2129 | int offset, | |
2e4e6a17 | 2130 | unsigned int protoff, |
cff533ac | 2131 | bool *hotdrop) |
1da177e4 LT |
2132 | { |
2133 | struct icmphdr _icmph, *ic; | |
2134 | const struct ipt_icmp *icmpinfo = matchinfo; | |
2135 | ||
2136 | /* Must not be a fragment. */ | |
2137 | if (offset) | |
1d93a9cb | 2138 | return false; |
1da177e4 | 2139 | |
2e4e6a17 | 2140 | ic = skb_header_pointer(skb, protoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2141 | if (ic == NULL) { |
2142 | /* We've been asked to examine this packet, and we | |
2143 | * can't. Hence, no choice but to drop. | |
2144 | */ | |
2145 | duprintf("Dropping evil ICMP tinygram.\n"); | |
cff533ac | 2146 | *hotdrop = true; |
1d93a9cb | 2147 | return false; |
1da177e4 LT |
2148 | } |
2149 | ||
2150 | return icmp_type_code_match(icmpinfo->type, | |
2151 | icmpinfo->code[0], | |
2152 | icmpinfo->code[1], | |
2153 | ic->type, ic->code, | |
2154 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2155 | } | |
2156 | ||
2157 | /* Called when user tries to insert an entry of this type. */ | |
ccb79bdc | 2158 | static bool |
1da177e4 | 2159 | icmp_checkentry(const char *tablename, |
9c547959 | 2160 | const void *entry, |
c4986734 | 2161 | const struct xt_match *match, |
1da177e4 | 2162 | void *matchinfo, |
1da177e4 LT |
2163 | unsigned int hook_mask) |
2164 | { | |
2165 | const struct ipt_icmp *icmpinfo = matchinfo; | |
2166 | ||
1d5cd909 PM |
2167 | /* Must specify no unknown invflags */ |
2168 | return !(icmpinfo->invflags & ~IPT_ICMP_INV); | |
1da177e4 LT |
2169 | } |
2170 | ||
2171 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2172 | static struct xt_target ipt_standard_target __read_mostly = { |
1da177e4 | 2173 | .name = IPT_STANDARD_TARGET, |
1d5cd909 | 2174 | .targetsize = sizeof(int), |
a45049c5 | 2175 | .family = AF_INET, |
2722971c | 2176 | #ifdef CONFIG_COMPAT |
9fa492cd PM |
2177 | .compatsize = sizeof(compat_int_t), |
2178 | .compat_from_user = compat_standard_from_user, | |
2179 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2180 | #endif |
1da177e4 LT |
2181 | }; |
2182 | ||
9f15c530 | 2183 | static struct xt_target ipt_error_target __read_mostly = { |
1da177e4 LT |
2184 | .name = IPT_ERROR_TARGET, |
2185 | .target = ipt_error, | |
1d5cd909 | 2186 | .targetsize = IPT_FUNCTION_MAXNAMELEN, |
a45049c5 | 2187 | .family = AF_INET, |
1da177e4 LT |
2188 | }; |
2189 | ||
2190 | static struct nf_sockopt_ops ipt_sockopts = { | |
2191 | .pf = PF_INET, | |
2192 | .set_optmin = IPT_BASE_CTL, | |
2193 | .set_optmax = IPT_SO_SET_MAX+1, | |
2194 | .set = do_ipt_set_ctl, | |
2722971c DM |
2195 | #ifdef CONFIG_COMPAT |
2196 | .compat_set = compat_do_ipt_set_ctl, | |
2197 | #endif | |
1da177e4 LT |
2198 | .get_optmin = IPT_BASE_CTL, |
2199 | .get_optmax = IPT_SO_GET_MAX+1, | |
2200 | .get = do_ipt_get_ctl, | |
2722971c DM |
2201 | #ifdef CONFIG_COMPAT |
2202 | .compat_get = compat_do_ipt_get_ctl, | |
2203 | #endif | |
16fcec35 | 2204 | .owner = THIS_MODULE, |
1da177e4 LT |
2205 | }; |
2206 | ||
9f15c530 | 2207 | static struct xt_match icmp_matchstruct __read_mostly = { |
1da177e4 | 2208 | .name = "icmp", |
1d5cd909 PM |
2209 | .match = icmp_match, |
2210 | .matchsize = sizeof(struct ipt_icmp), | |
9c547959 | 2211 | .checkentry = icmp_checkentry, |
1d5cd909 | 2212 | .proto = IPPROTO_ICMP, |
a45049c5 | 2213 | .family = AF_INET, |
1da177e4 LT |
2214 | }; |
2215 | ||
3cb609d5 AD |
2216 | static int __net_init ip_tables_net_init(struct net *net) |
2217 | { | |
2218 | return xt_proto_init(net, AF_INET); | |
2219 | } | |
2220 | ||
2221 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2222 | { | |
2223 | xt_proto_fini(net, AF_INET); | |
2224 | } | |
2225 | ||
2226 | static struct pernet_operations ip_tables_net_ops = { | |
2227 | .init = ip_tables_net_init, | |
2228 | .exit = ip_tables_net_exit, | |
2229 | }; | |
2230 | ||
65b4b4e8 | 2231 | static int __init ip_tables_init(void) |
1da177e4 LT |
2232 | { |
2233 | int ret; | |
2234 | ||
3cb609d5 | 2235 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2236 | if (ret < 0) |
2237 | goto err1; | |
2e4e6a17 | 2238 | |
1da177e4 | 2239 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2240 | ret = xt_register_target(&ipt_standard_target); |
2241 | if (ret < 0) | |
2242 | goto err2; | |
2243 | ret = xt_register_target(&ipt_error_target); | |
2244 | if (ret < 0) | |
2245 | goto err3; | |
2246 | ret = xt_register_match(&icmp_matchstruct); | |
2247 | if (ret < 0) | |
2248 | goto err4; | |
1da177e4 LT |
2249 | |
2250 | /* Register setsockopt */ | |
2251 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2252 | if (ret < 0) |
2253 | goto err5; | |
1da177e4 | 2254 | |
0236e667 | 2255 | printk(KERN_INFO "ip_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2256 | return 0; |
0eff66e6 PM |
2257 | |
2258 | err5: | |
2259 | xt_unregister_match(&icmp_matchstruct); | |
2260 | err4: | |
2261 | xt_unregister_target(&ipt_error_target); | |
2262 | err3: | |
2263 | xt_unregister_target(&ipt_standard_target); | |
2264 | err2: | |
3cb609d5 | 2265 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2266 | err1: |
2267 | return ret; | |
1da177e4 LT |
2268 | } |
2269 | ||
65b4b4e8 | 2270 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2271 | { |
2272 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2273 | |
a45049c5 PNA |
2274 | xt_unregister_match(&icmp_matchstruct); |
2275 | xt_unregister_target(&ipt_error_target); | |
2276 | xt_unregister_target(&ipt_standard_target); | |
2e4e6a17 | 2277 | |
3cb609d5 | 2278 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2279 | } |
2280 | ||
2281 | EXPORT_SYMBOL(ipt_register_table); | |
2282 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2283 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2284 | module_init(ip_tables_init); |
2285 | module_exit(ip_tables_fini); |