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 | |
f7108a20 JE |
189 | do_match(struct ipt_entry_match *m, const struct sk_buff *skb, |
190 | struct xt_match_param *par) | |
1da177e4 | 191 | { |
f7108a20 JE |
192 | par->match = m->u.kernel.match; |
193 | par->matchinfo = m->data; | |
194 | ||
1da177e4 | 195 | /* Stop iteration if it doesn't match */ |
f7108a20 | 196 | if (!m->u.kernel.match->match(skb, par)) |
1d93a9cb | 197 | return true; |
1da177e4 | 198 | else |
1d93a9cb | 199 | return false; |
1da177e4 LT |
200 | } |
201 | ||
022748a9 | 202 | /* Performance critical */ |
1da177e4 LT |
203 | static inline struct ipt_entry * |
204 | get_entry(void *base, unsigned int offset) | |
205 | { | |
206 | return (struct ipt_entry *)(base + offset); | |
207 | } | |
208 | ||
ba9dda3a | 209 | /* All zeroes == unconditional rule. */ |
022748a9 | 210 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
211 | static inline int |
212 | unconditional(const struct ipt_ip *ip) | |
213 | { | |
214 | unsigned int i; | |
215 | ||
216 | for (i = 0; i < sizeof(*ip)/sizeof(__u32); i++) | |
217 | if (((__u32 *)ip)[i]) | |
218 | return 0; | |
219 | ||
220 | return 1; | |
e79ec50b | 221 | #undef FWINV |
ba9dda3a JK |
222 | } |
223 | ||
224 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
225 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
022748a9 | 226 | static const char *const hooknames[] = { |
6e23ae2a PM |
227 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
228 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 229 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
230 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
231 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
232 | }; |
233 | ||
234 | enum nf_ip_trace_comments { | |
235 | NF_IP_TRACE_COMMENT_RULE, | |
236 | NF_IP_TRACE_COMMENT_RETURN, | |
237 | NF_IP_TRACE_COMMENT_POLICY, | |
238 | }; | |
239 | ||
022748a9 | 240 | static const char *const comments[] = { |
ba9dda3a JK |
241 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
242 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
243 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
244 | }; | |
245 | ||
246 | static struct nf_loginfo trace_loginfo = { | |
247 | .type = NF_LOG_TYPE_LOG, | |
248 | .u = { | |
249 | .log = { | |
250 | .level = 4, | |
251 | .logflags = NF_LOG_MASK, | |
252 | }, | |
253 | }, | |
254 | }; | |
255 | ||
022748a9 | 256 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
257 | static inline int |
258 | get_chainname_rulenum(struct ipt_entry *s, struct ipt_entry *e, | |
259 | char *hookname, char **chainname, | |
260 | char **comment, unsigned int *rulenum) | |
261 | { | |
262 | struct ipt_standard_target *t = (void *)ipt_get_target(s); | |
263 | ||
264 | if (strcmp(t->target.u.kernel.target->name, IPT_ERROR_TARGET) == 0) { | |
265 | /* Head of user chain: ERROR target with chainname */ | |
266 | *chainname = t->target.data; | |
267 | (*rulenum) = 0; | |
268 | } else if (s == e) { | |
269 | (*rulenum)++; | |
270 | ||
271 | if (s->target_offset == sizeof(struct ipt_entry) | |
272 | && strcmp(t->target.u.kernel.target->name, | |
273 | IPT_STANDARD_TARGET) == 0 | |
274 | && t->verdict < 0 | |
275 | && unconditional(&s->ip)) { | |
276 | /* Tail of chains: STANDARD target (return/policy) */ | |
277 | *comment = *chainname == hookname | |
278 | ? (char *)comments[NF_IP_TRACE_COMMENT_POLICY] | |
279 | : (char *)comments[NF_IP_TRACE_COMMENT_RETURN]; | |
280 | } | |
281 | return 1; | |
282 | } else | |
283 | (*rulenum)++; | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
288 | static void trace_packet(struct sk_buff *skb, | |
289 | unsigned int hook, | |
290 | const struct net_device *in, | |
291 | const struct net_device *out, | |
ecb6f85e | 292 | const char *tablename, |
ba9dda3a JK |
293 | struct xt_table_info *private, |
294 | struct ipt_entry *e) | |
295 | { | |
296 | void *table_base; | |
5452e425 | 297 | const struct ipt_entry *root; |
ba9dda3a JK |
298 | char *hookname, *chainname, *comment; |
299 | unsigned int rulenum = 0; | |
300 | ||
301 | table_base = (void *)private->entries[smp_processor_id()]; | |
302 | root = get_entry(table_base, private->hook_entry[hook]); | |
303 | ||
304 | hookname = chainname = (char *)hooknames[hook]; | |
305 | comment = (char *)comments[NF_IP_TRACE_COMMENT_RULE]; | |
306 | ||
307 | IPT_ENTRY_ITERATE(root, | |
308 | private->size - private->hook_entry[hook], | |
309 | get_chainname_rulenum, | |
310 | e, hookname, &chainname, &comment, &rulenum); | |
311 | ||
312 | nf_log_packet(AF_INET, hook, skb, in, out, &trace_loginfo, | |
313 | "TRACE: %s:%s:%s:%u ", | |
314 | tablename, chainname, comment, rulenum); | |
315 | } | |
316 | #endif | |
317 | ||
1da177e4 LT |
318 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
319 | unsigned int | |
3db05fea | 320 | ipt_do_table(struct sk_buff *skb, |
1da177e4 LT |
321 | unsigned int hook, |
322 | const struct net_device *in, | |
323 | const struct net_device *out, | |
e60a13e0 | 324 | struct xt_table *table) |
1da177e4 LT |
325 | { |
326 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); | |
5452e425 | 327 | const struct iphdr *ip; |
1da177e4 | 328 | u_int16_t datalen; |
cff533ac | 329 | bool hotdrop = false; |
1da177e4 LT |
330 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
331 | unsigned int verdict = NF_DROP; | |
332 | const char *indev, *outdev; | |
333 | void *table_base; | |
334 | struct ipt_entry *e, *back; | |
8311731a | 335 | struct xt_table_info *private; |
f7108a20 | 336 | struct xt_match_param mtpar; |
1da177e4 LT |
337 | |
338 | /* Initialization */ | |
3db05fea HX |
339 | ip = ip_hdr(skb); |
340 | datalen = skb->len - ip->ihl * 4; | |
1da177e4 LT |
341 | indev = in ? in->name : nulldevname; |
342 | outdev = out ? out->name : nulldevname; | |
343 | /* We handle fragments by dealing with the first fragment as | |
344 | * if it was a normal packet. All other fragments are treated | |
345 | * normally, except that they will NEVER match rules that ask | |
346 | * things we don't know, ie. tcp syn flag or ports). If the | |
347 | * rule is also a fragment-specific rule, non-fragments won't | |
348 | * match it. */ | |
f7108a20 JE |
349 | mtpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
350 | mtpar.thoff = ip_hdrlen(skb); | |
351 | mtpar.hotdrop = &hotdrop; | |
352 | mtpar.in = in; | |
353 | mtpar.out = out; | |
1da177e4 LT |
354 | |
355 | read_lock_bh(&table->lock); | |
356 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); | |
8311731a | 357 | private = table->private; |
2e4e6a17 HW |
358 | table_base = (void *)private->entries[smp_processor_id()]; |
359 | e = get_entry(table_base, private->hook_entry[hook]); | |
1da177e4 LT |
360 | |
361 | /* For return from builtin chain */ | |
2e4e6a17 | 362 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
363 | |
364 | do { | |
365 | IP_NF_ASSERT(e); | |
366 | IP_NF_ASSERT(back); | |
f7108a20 JE |
367 | if (ip_packet_match(ip, indev, outdev, |
368 | &e->ip, mtpar.fragoff)) { | |
1da177e4 LT |
369 | struct ipt_entry_target *t; |
370 | ||
f7108a20 | 371 | if (IPT_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) |
1da177e4 LT |
372 | goto no_match; |
373 | ||
374 | ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1); | |
375 | ||
376 | t = ipt_get_target(e); | |
377 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
378 | |
379 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
380 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
381 | /* The packet is traced: log it */ | |
3db05fea HX |
382 | if (unlikely(skb->nf_trace)) |
383 | trace_packet(skb, hook, in, out, | |
ba9dda3a JK |
384 | table->name, private, e); |
385 | #endif | |
1da177e4 LT |
386 | /* Standard target? */ |
387 | if (!t->u.kernel.target->target) { | |
388 | int v; | |
389 | ||
390 | v = ((struct ipt_standard_target *)t)->verdict; | |
391 | if (v < 0) { | |
392 | /* Pop from stack? */ | |
393 | if (v != IPT_RETURN) { | |
394 | verdict = (unsigned)(-v) - 1; | |
395 | break; | |
396 | } | |
397 | e = back; | |
398 | back = get_entry(table_base, | |
399 | back->comefrom); | |
400 | continue; | |
401 | } | |
05465343 PM |
402 | if (table_base + v != (void *)e + e->next_offset |
403 | && !(e->ip.flags & IPT_F_GOTO)) { | |
1da177e4 LT |
404 | /* Save old back ptr in next entry */ |
405 | struct ipt_entry *next | |
406 | = (void *)e + e->next_offset; | |
407 | next->comefrom | |
408 | = (void *)back - table_base; | |
409 | /* set back pointer to next entry */ | |
410 | back = next; | |
411 | } | |
412 | ||
413 | e = get_entry(table_base, v); | |
414 | } else { | |
415 | /* Targets which reenter must return | |
e905a9ed | 416 | abs. verdicts */ |
1da177e4 LT |
417 | #ifdef CONFIG_NETFILTER_DEBUG |
418 | ((struct ipt_entry *)table_base)->comefrom | |
419 | = 0xeeeeeeec; | |
420 | #endif | |
3db05fea | 421 | verdict = t->u.kernel.target->target(skb, |
1da177e4 LT |
422 | in, out, |
423 | hook, | |
1c524830 | 424 | t->u.kernel.target, |
fe1cb108 | 425 | t->data); |
1da177e4 LT |
426 | |
427 | #ifdef CONFIG_NETFILTER_DEBUG | |
428 | if (((struct ipt_entry *)table_base)->comefrom | |
429 | != 0xeeeeeeec | |
430 | && verdict == IPT_CONTINUE) { | |
431 | printk("Target %s reentered!\n", | |
432 | t->u.kernel.target->name); | |
433 | verdict = NF_DROP; | |
434 | } | |
435 | ((struct ipt_entry *)table_base)->comefrom | |
436 | = 0x57acc001; | |
437 | #endif | |
438 | /* Target might have changed stuff. */ | |
3db05fea HX |
439 | ip = ip_hdr(skb); |
440 | datalen = skb->len - ip->ihl * 4; | |
1da177e4 LT |
441 | |
442 | if (verdict == IPT_CONTINUE) | |
443 | e = (void *)e + e->next_offset; | |
444 | else | |
445 | /* Verdict */ | |
446 | break; | |
447 | } | |
448 | } else { | |
449 | ||
450 | no_match: | |
451 | e = (void *)e + e->next_offset; | |
452 | } | |
453 | } while (!hotdrop); | |
454 | ||
1da177e4 LT |
455 | read_unlock_bh(&table->lock); |
456 | ||
457 | #ifdef DEBUG_ALLOW_ALL | |
458 | return NF_ACCEPT; | |
459 | #else | |
460 | if (hotdrop) | |
461 | return NF_DROP; | |
462 | else return verdict; | |
463 | #endif | |
464 | } | |
465 | ||
1da177e4 LT |
466 | /* Figures out from what hook each rule can be called: returns 0 if |
467 | there are loops. Puts hook bitmask in comefrom. */ | |
468 | static int | |
2e4e6a17 | 469 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 470 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
471 | { |
472 | unsigned int hook; | |
473 | ||
474 | /* No recursion; use packet counter to save back ptrs (reset | |
475 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 476 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 477 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 478 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
479 | |
480 | if (!(valid_hooks & (1 << hook))) | |
481 | continue; | |
482 | ||
483 | /* Set initial back pointer. */ | |
484 | e->counters.pcnt = pos; | |
485 | ||
486 | for (;;) { | |
487 | struct ipt_standard_target *t | |
488 | = (void *)ipt_get_target(e); | |
e1b4b9f3 | 489 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 490 | |
6e23ae2a | 491 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
492 | printk("iptables: loop hook %u pos %u %08X.\n", |
493 | hook, pos, e->comefrom); | |
494 | return 0; | |
495 | } | |
9c547959 | 496 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
497 | |
498 | /* Unconditional return/END. */ | |
e1b4b9f3 | 499 | if ((e->target_offset == sizeof(struct ipt_entry) |
1da177e4 LT |
500 | && (strcmp(t->target.u.user.name, |
501 | IPT_STANDARD_TARGET) == 0) | |
502 | && t->verdict < 0 | |
e1b4b9f3 | 503 | && unconditional(&e->ip)) || visited) { |
1da177e4 LT |
504 | unsigned int oldpos, size; |
505 | ||
74c9c0c1 DM |
506 | if (t->verdict < -NF_MAX_VERDICT - 1) { |
507 | duprintf("mark_source_chains: bad " | |
508 | "negative verdict (%i)\n", | |
509 | t->verdict); | |
510 | return 0; | |
511 | } | |
512 | ||
1da177e4 LT |
513 | /* Return: backtrack through the last |
514 | big jump. */ | |
515 | do { | |
6e23ae2a | 516 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
517 | #ifdef DEBUG_IP_FIREWALL_USER |
518 | if (e->comefrom | |
6e23ae2a | 519 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
520 | duprintf("Back unset " |
521 | "on hook %u " | |
522 | "rule %u\n", | |
523 | hook, pos); | |
524 | } | |
525 | #endif | |
526 | oldpos = pos; | |
527 | pos = e->counters.pcnt; | |
528 | e->counters.pcnt = 0; | |
529 | ||
530 | /* We're at the start. */ | |
531 | if (pos == oldpos) | |
532 | goto next; | |
533 | ||
534 | e = (struct ipt_entry *) | |
31836064 | 535 | (entry0 + pos); |
1da177e4 LT |
536 | } while (oldpos == pos + e->next_offset); |
537 | ||
538 | /* Move along one */ | |
539 | size = e->next_offset; | |
540 | e = (struct ipt_entry *) | |
31836064 | 541 | (entry0 + pos + size); |
1da177e4 LT |
542 | e->counters.pcnt = pos; |
543 | pos += size; | |
544 | } else { | |
545 | int newpos = t->verdict; | |
546 | ||
547 | if (strcmp(t->target.u.user.name, | |
548 | IPT_STANDARD_TARGET) == 0 | |
549 | && newpos >= 0) { | |
74c9c0c1 DM |
550 | if (newpos > newinfo->size - |
551 | sizeof(struct ipt_entry)) { | |
552 | duprintf("mark_source_chains: " | |
553 | "bad verdict (%i)\n", | |
554 | newpos); | |
555 | return 0; | |
556 | } | |
1da177e4 LT |
557 | /* This a jump; chase it. */ |
558 | duprintf("Jump rule %u -> %u\n", | |
559 | pos, newpos); | |
560 | } else { | |
561 | /* ... this is a fallthru */ | |
562 | newpos = pos + e->next_offset; | |
563 | } | |
564 | e = (struct ipt_entry *) | |
31836064 | 565 | (entry0 + newpos); |
1da177e4 LT |
566 | e->counters.pcnt = pos; |
567 | pos = newpos; | |
568 | } | |
569 | } | |
570 | next: | |
571 | duprintf("Finished chain %u\n", hook); | |
572 | } | |
573 | return 1; | |
574 | } | |
575 | ||
022748a9 | 576 | static int |
1da177e4 LT |
577 | cleanup_match(struct ipt_entry_match *m, unsigned int *i) |
578 | { | |
579 | if (i && (*i)-- == 0) | |
580 | return 1; | |
581 | ||
582 | if (m->u.kernel.match->destroy) | |
efa74165 | 583 | m->u.kernel.match->destroy(m->u.kernel.match, m->data); |
1da177e4 LT |
584 | module_put(m->u.kernel.match->me); |
585 | return 0; | |
586 | } | |
587 | ||
022748a9 | 588 | static int |
a96be246 DM |
589 | check_entry(struct ipt_entry *e, const char *name) |
590 | { | |
591 | struct ipt_entry_target *t; | |
592 | ||
593 | if (!ip_checkentry(&e->ip)) { | |
594 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
595 | return -EINVAL; | |
596 | } | |
597 | ||
9c547959 PM |
598 | if (e->target_offset + sizeof(struct ipt_entry_target) > |
599 | e->next_offset) | |
a96be246 DM |
600 | return -EINVAL; |
601 | ||
602 | t = ipt_get_target(e); | |
603 | if (e->target_offset + t->u.target_size > e->next_offset) | |
604 | return -EINVAL; | |
605 | ||
606 | return 0; | |
607 | } | |
608 | ||
022748a9 DV |
609 | static int |
610 | check_match(struct ipt_entry_match *m, const char *name, | |
4b478248 PM |
611 | const struct ipt_ip *ip, |
612 | unsigned int hookmask, unsigned int *i) | |
a96be246 | 613 | { |
6709dbbb | 614 | struct xt_match *match; |
a96be246 DM |
615 | int ret; |
616 | ||
617 | match = m->u.kernel.match; | |
618 | ret = xt_check_match(match, AF_INET, m->u.match_size - sizeof(*m), | |
619 | name, hookmask, ip->proto, | |
367c6790 JE |
620 | ip->invflags & IPT_INV_PROTO, ip, m->data); |
621 | if (ret < 0) { | |
a96be246 DM |
622 | duprintf("ip_tables: check failed for `%s'.\n", |
623 | m->u.kernel.match->name); | |
367c6790 | 624 | return ret; |
a96be246 | 625 | } |
367c6790 JE |
626 | ++*i; |
627 | return 0; | |
a96be246 DM |
628 | } |
629 | ||
022748a9 | 630 | static int |
a96be246 | 631 | find_check_match(struct ipt_entry_match *m, |
4b478248 PM |
632 | const char *name, |
633 | const struct ipt_ip *ip, | |
634 | unsigned int hookmask, | |
635 | unsigned int *i) | |
1da177e4 | 636 | { |
6709dbbb | 637 | struct xt_match *match; |
3cdc7c95 | 638 | int ret; |
1da177e4 | 639 | |
2e4e6a17 | 640 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, |
9c547959 | 641 | m->u.user.revision), |
1da177e4 LT |
642 | "ipt_%s", m->u.user.name); |
643 | if (IS_ERR(match) || !match) { | |
a96be246 | 644 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
1da177e4 LT |
645 | return match ? PTR_ERR(match) : -ENOENT; |
646 | } | |
647 | m->u.kernel.match = match; | |
648 | ||
4c1b52bc | 649 | ret = check_match(m, name, ip, hookmask, i); |
3cdc7c95 PM |
650 | if (ret) |
651 | goto err; | |
652 | ||
1da177e4 | 653 | return 0; |
3cdc7c95 PM |
654 | err: |
655 | module_put(m->u.kernel.match->me); | |
656 | return ret; | |
1da177e4 LT |
657 | } |
658 | ||
022748a9 | 659 | static int check_target(struct ipt_entry *e, const char *name) |
a96be246 | 660 | { |
e905a9ed | 661 | struct ipt_entry_target *t; |
6709dbbb | 662 | struct xt_target *target; |
e905a9ed | 663 | int ret; |
a96be246 DM |
664 | |
665 | t = ipt_get_target(e); | |
666 | target = t->u.kernel.target; | |
667 | ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t), | |
668 | name, e->comefrom, e->ip.proto, | |
367c6790 JE |
669 | e->ip.invflags & IPT_INV_PROTO, e, t->data); |
670 | if (ret < 0) { | |
a96be246 DM |
671 | duprintf("ip_tables: check failed for `%s'.\n", |
672 | t->u.kernel.target->name); | |
367c6790 | 673 | return ret; |
a96be246 | 674 | } |
367c6790 | 675 | return 0; |
a96be246 | 676 | } |
1da177e4 | 677 | |
022748a9 | 678 | static int |
a96be246 | 679 | find_check_entry(struct ipt_entry *e, const char *name, unsigned int size, |
4b478248 | 680 | unsigned int *i) |
1da177e4 LT |
681 | { |
682 | struct ipt_entry_target *t; | |
6709dbbb | 683 | struct xt_target *target; |
1da177e4 LT |
684 | int ret; |
685 | unsigned int j; | |
686 | ||
a96be246 DM |
687 | ret = check_entry(e, name); |
688 | if (ret) | |
689 | return ret; | |
590bdf7f | 690 | |
1da177e4 | 691 | j = 0; |
a96be246 | 692 | ret = IPT_MATCH_ITERATE(e, find_check_match, name, &e->ip, |
4b478248 | 693 | e->comefrom, &j); |
1da177e4 LT |
694 | if (ret != 0) |
695 | goto cleanup_matches; | |
696 | ||
697 | t = ipt_get_target(e); | |
2e4e6a17 | 698 | target = try_then_request_module(xt_find_target(AF_INET, |
4b478248 PM |
699 | t->u.user.name, |
700 | t->u.user.revision), | |
1da177e4 LT |
701 | "ipt_%s", t->u.user.name); |
702 | if (IS_ERR(target) || !target) { | |
a96be246 | 703 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
1da177e4 LT |
704 | ret = target ? PTR_ERR(target) : -ENOENT; |
705 | goto cleanup_matches; | |
706 | } | |
707 | t->u.kernel.target = target; | |
708 | ||
a96be246 | 709 | ret = check_target(e, name); |
3cdc7c95 PM |
710 | if (ret) |
711 | goto err; | |
712 | ||
1da177e4 LT |
713 | (*i)++; |
714 | return 0; | |
3cdc7c95 PM |
715 | err: |
716 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
717 | cleanup_matches: |
718 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
719 | return ret; | |
720 | } | |
721 | ||
022748a9 | 722 | static int |
1da177e4 | 723 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 724 | struct xt_table_info *newinfo, |
1da177e4 LT |
725 | unsigned char *base, |
726 | unsigned char *limit, | |
727 | const unsigned int *hook_entries, | |
728 | const unsigned int *underflows, | |
729 | unsigned int *i) | |
730 | { | |
731 | unsigned int h; | |
732 | ||
733 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 | |
734 | || (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { | |
735 | duprintf("Bad offset %p\n", e); | |
736 | return -EINVAL; | |
737 | } | |
738 | ||
739 | if (e->next_offset | |
740 | < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) { | |
741 | duprintf("checking: element %p size %u\n", | |
742 | e, e->next_offset); | |
743 | return -EINVAL; | |
744 | } | |
745 | ||
746 | /* Check hooks & underflows */ | |
6e23ae2a | 747 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
1da177e4 LT |
748 | if ((unsigned char *)e - base == hook_entries[h]) |
749 | newinfo->hook_entry[h] = hook_entries[h]; | |
750 | if ((unsigned char *)e - base == underflows[h]) | |
751 | newinfo->underflow[h] = underflows[h]; | |
752 | } | |
753 | ||
754 | /* FIXME: underflows must be unconditional, standard verdicts | |
e905a9ed | 755 | < 0 (not IPT_RETURN). --RR */ |
1da177e4 LT |
756 | |
757 | /* Clear counters and comefrom */ | |
2e4e6a17 | 758 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
759 | e->comefrom = 0; |
760 | ||
761 | (*i)++; | |
762 | return 0; | |
763 | } | |
764 | ||
022748a9 | 765 | static int |
1da177e4 LT |
766 | cleanup_entry(struct ipt_entry *e, unsigned int *i) |
767 | { | |
768 | struct ipt_entry_target *t; | |
769 | ||
770 | if (i && (*i)-- == 0) | |
771 | return 1; | |
772 | ||
773 | /* Cleanup all matches */ | |
774 | IPT_MATCH_ITERATE(e, cleanup_match, NULL); | |
775 | t = ipt_get_target(e); | |
776 | if (t->u.kernel.target->destroy) | |
efa74165 | 777 | t->u.kernel.target->destroy(t->u.kernel.target, t->data); |
1da177e4 LT |
778 | module_put(t->u.kernel.target->me); |
779 | return 0; | |
780 | } | |
781 | ||
782 | /* Checks and translates the user-supplied table segment (held in | |
783 | newinfo) */ | |
784 | static int | |
785 | translate_table(const char *name, | |
786 | unsigned int valid_hooks, | |
2e4e6a17 | 787 | struct xt_table_info *newinfo, |
31836064 | 788 | void *entry0, |
1da177e4 LT |
789 | unsigned int size, |
790 | unsigned int number, | |
791 | const unsigned int *hook_entries, | |
792 | const unsigned int *underflows) | |
793 | { | |
794 | unsigned int i; | |
795 | int ret; | |
796 | ||
797 | newinfo->size = size; | |
798 | newinfo->number = number; | |
799 | ||
800 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 801 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
802 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
803 | newinfo->underflow[i] = 0xFFFFFFFF; | |
804 | } | |
805 | ||
806 | duprintf("translate_table: size %u\n", newinfo->size); | |
807 | i = 0; | |
808 | /* Walk through entries, checking offsets. */ | |
31836064 | 809 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
810 | check_entry_size_and_hooks, |
811 | newinfo, | |
31836064 ED |
812 | entry0, |
813 | entry0 + size, | |
1da177e4 LT |
814 | hook_entries, underflows, &i); |
815 | if (ret != 0) | |
816 | return ret; | |
817 | ||
818 | if (i != number) { | |
819 | duprintf("translate_table: %u not %u entries\n", | |
820 | i, number); | |
821 | return -EINVAL; | |
822 | } | |
823 | ||
824 | /* Check hooks all assigned */ | |
6e23ae2a | 825 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
826 | /* Only hooks which are valid */ |
827 | if (!(valid_hooks & (1 << i))) | |
828 | continue; | |
829 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
830 | duprintf("Invalid hook entry %u %u\n", | |
831 | i, hook_entries[i]); | |
832 | return -EINVAL; | |
833 | } | |
834 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
835 | duprintf("Invalid underflow %u %u\n", | |
836 | i, underflows[i]); | |
837 | return -EINVAL; | |
838 | } | |
839 | } | |
840 | ||
74c9c0c1 DM |
841 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
842 | return -ELOOP; | |
843 | ||
1da177e4 LT |
844 | /* Finally, each sanity check must pass */ |
845 | i = 0; | |
31836064 | 846 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
a96be246 | 847 | find_check_entry, name, size, &i); |
1da177e4 | 848 | |
74c9c0c1 DM |
849 | if (ret != 0) { |
850 | IPT_ENTRY_ITERATE(entry0, newinfo->size, | |
851 | cleanup_entry, &i); | |
852 | return ret; | |
853 | } | |
1da177e4 LT |
854 | |
855 | /* And one copy for every other CPU */ | |
6f912042 | 856 | for_each_possible_cpu(i) { |
31836064 ED |
857 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
858 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
859 | } |
860 | ||
861 | return ret; | |
862 | } | |
863 | ||
1da177e4 LT |
864 | /* Gets counters. */ |
865 | static inline int | |
866 | add_entry_to_counter(const struct ipt_entry *e, | |
2e4e6a17 | 867 | struct xt_counters total[], |
1da177e4 LT |
868 | unsigned int *i) |
869 | { | |
870 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
871 | ||
872 | (*i)++; | |
873 | return 0; | |
874 | } | |
875 | ||
31836064 ED |
876 | static inline int |
877 | set_entry_to_counter(const struct ipt_entry *e, | |
878 | struct ipt_counters total[], | |
879 | unsigned int *i) | |
880 | { | |
881 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
882 | ||
883 | (*i)++; | |
884 | return 0; | |
885 | } | |
886 | ||
1da177e4 | 887 | static void |
2e4e6a17 HW |
888 | get_counters(const struct xt_table_info *t, |
889 | struct xt_counters counters[]) | |
1da177e4 LT |
890 | { |
891 | unsigned int cpu; | |
892 | unsigned int i; | |
31836064 ED |
893 | unsigned int curcpu; |
894 | ||
895 | /* Instead of clearing (by a previous call to memset()) | |
896 | * the counters and using adds, we set the counters | |
897 | * with data used by 'current' CPU | |
898 | * We dont care about preemption here. | |
899 | */ | |
900 | curcpu = raw_smp_processor_id(); | |
901 | ||
902 | i = 0; | |
903 | IPT_ENTRY_ITERATE(t->entries[curcpu], | |
904 | t->size, | |
905 | set_entry_to_counter, | |
906 | counters, | |
907 | &i); | |
1da177e4 | 908 | |
6f912042 | 909 | for_each_possible_cpu(cpu) { |
31836064 ED |
910 | if (cpu == curcpu) |
911 | continue; | |
1da177e4 | 912 | i = 0; |
31836064 | 913 | IPT_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
914 | t->size, |
915 | add_entry_to_counter, | |
916 | counters, | |
917 | &i); | |
918 | } | |
919 | } | |
920 | ||
022748a9 | 921 | static struct xt_counters * alloc_counters(struct xt_table *table) |
1da177e4 | 922 | { |
2722971c | 923 | unsigned int countersize; |
2e4e6a17 | 924 | struct xt_counters *counters; |
5452e425 | 925 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
926 | |
927 | /* We need atomic snapshot of counters: rest doesn't change | |
928 | (other than comefrom, which userspace doesn't care | |
929 | about). */ | |
2e4e6a17 | 930 | countersize = sizeof(struct xt_counters) * private->number; |
31836064 | 931 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
932 | |
933 | if (counters == NULL) | |
2722971c | 934 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
935 | |
936 | /* First, sum counters... */ | |
1da177e4 | 937 | write_lock_bh(&table->lock); |
2e4e6a17 | 938 | get_counters(private, counters); |
1da177e4 LT |
939 | write_unlock_bh(&table->lock); |
940 | ||
2722971c DM |
941 | return counters; |
942 | } | |
943 | ||
944 | static int | |
945 | copy_entries_to_user(unsigned int total_size, | |
e60a13e0 | 946 | struct xt_table *table, |
2722971c DM |
947 | void __user *userptr) |
948 | { | |
949 | unsigned int off, num; | |
950 | struct ipt_entry *e; | |
951 | struct xt_counters *counters; | |
5452e425 | 952 | const struct xt_table_info *private = table->private; |
2722971c | 953 | int ret = 0; |
5452e425 | 954 | const void *loc_cpu_entry; |
2722971c DM |
955 | |
956 | counters = alloc_counters(table); | |
957 | if (IS_ERR(counters)) | |
958 | return PTR_ERR(counters); | |
959 | ||
31836064 ED |
960 | /* choose the copy that is on our node/cpu, ... |
961 | * This choice is lazy (because current thread is | |
962 | * allowed to migrate to another cpu) | |
963 | */ | |
2e4e6a17 | 964 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 965 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
966 | ret = -EFAULT; |
967 | goto free_counters; | |
968 | } | |
969 | ||
970 | /* FIXME: use iterator macros --RR */ | |
971 | /* ... then go back and fix counters and names */ | |
972 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
973 | unsigned int i; | |
5452e425 JE |
974 | const struct ipt_entry_match *m; |
975 | const struct ipt_entry_target *t; | |
1da177e4 | 976 | |
31836064 | 977 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
978 | if (copy_to_user(userptr + off |
979 | + offsetof(struct ipt_entry, counters), | |
980 | &counters[num], | |
981 | sizeof(counters[num])) != 0) { | |
982 | ret = -EFAULT; | |
983 | goto free_counters; | |
984 | } | |
985 | ||
986 | for (i = sizeof(struct ipt_entry); | |
987 | i < e->target_offset; | |
988 | i += m->u.match_size) { | |
989 | m = (void *)e + i; | |
990 | ||
991 | if (copy_to_user(userptr + off + i | |
992 | + offsetof(struct ipt_entry_match, | |
993 | u.user.name), | |
994 | m->u.kernel.match->name, | |
995 | strlen(m->u.kernel.match->name)+1) | |
996 | != 0) { | |
997 | ret = -EFAULT; | |
998 | goto free_counters; | |
999 | } | |
1000 | } | |
1001 | ||
1002 | t = ipt_get_target(e); | |
1003 | if (copy_to_user(userptr + off + e->target_offset | |
1004 | + offsetof(struct ipt_entry_target, | |
1005 | u.user.name), | |
1006 | t->u.kernel.target->name, | |
1007 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1008 | ret = -EFAULT; | |
1009 | goto free_counters; | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | free_counters: | |
1014 | vfree(counters); | |
1015 | return ret; | |
1016 | } | |
1017 | ||
2722971c | 1018 | #ifdef CONFIG_COMPAT |
9fa492cd | 1019 | static void compat_standard_from_user(void *dst, void *src) |
2722971c | 1020 | { |
9fa492cd | 1021 | int v = *(compat_int_t *)src; |
2722971c | 1022 | |
9fa492cd | 1023 | if (v > 0) |
b386d9f5 | 1024 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1025 | memcpy(dst, &v, sizeof(v)); |
1026 | } | |
46c5ea3c | 1027 | |
9fa492cd | 1028 | static int compat_standard_to_user(void __user *dst, void *src) |
2722971c | 1029 | { |
9fa492cd | 1030 | compat_int_t cv = *(int *)src; |
2722971c | 1031 | |
9fa492cd | 1032 | if (cv > 0) |
b386d9f5 | 1033 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1034 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1035 | } |
1036 | ||
1037 | static inline int | |
4b478248 | 1038 | compat_calc_match(struct ipt_entry_match *m, int *size) |
2722971c | 1039 | { |
9fa492cd | 1040 | *size += xt_compat_match_offset(m->u.kernel.match); |
2722971c DM |
1041 | return 0; |
1042 | } | |
1043 | ||
259d4e41 | 1044 | static int compat_calc_entry(struct ipt_entry *e, |
4b478248 PM |
1045 | const struct xt_table_info *info, |
1046 | void *base, struct xt_table_info *newinfo) | |
2722971c DM |
1047 | { |
1048 | struct ipt_entry_target *t; | |
e5b5ef7d | 1049 | unsigned int entry_offset; |
2722971c DM |
1050 | int off, i, ret; |
1051 | ||
30c08c41 | 1052 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1053 | entry_offset = (void *)e - base; |
1054 | IPT_MATCH_ITERATE(e, compat_calc_match, &off); | |
1055 | t = ipt_get_target(e); | |
9fa492cd | 1056 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1057 | newinfo->size -= off; |
b386d9f5 | 1058 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1059 | if (ret) |
1060 | return ret; | |
1061 | ||
6e23ae2a | 1062 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1063 | if (info->hook_entry[i] && |
1064 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1065 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1066 | if (info->underflow[i] && |
1067 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1068 | newinfo->underflow[i] -= off; |
1069 | } | |
1070 | return 0; | |
1071 | } | |
1072 | ||
259d4e41 | 1073 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1074 | struct xt_table_info *newinfo) |
2722971c DM |
1075 | { |
1076 | void *loc_cpu_entry; | |
2722971c DM |
1077 | |
1078 | if (!newinfo || !info) | |
1079 | return -EINVAL; | |
1080 | ||
259d4e41 ED |
1081 | /* we dont care about newinfo->entries[] */ |
1082 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1083 | newinfo->initial_entries = 0; | |
2722971c DM |
1084 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
1085 | return IPT_ENTRY_ITERATE(loc_cpu_entry, info->size, | |
4b478248 PM |
1086 | compat_calc_entry, info, loc_cpu_entry, |
1087 | newinfo); | |
2722971c DM |
1088 | } |
1089 | #endif | |
1090 | ||
34bd137b | 1091 | static int get_info(struct net *net, void __user *user, int *len, int compat) |
2722971c DM |
1092 | { |
1093 | char name[IPT_TABLE_MAXNAMELEN]; | |
e60a13e0 | 1094 | struct xt_table *t; |
2722971c DM |
1095 | int ret; |
1096 | ||
1097 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1098 | duprintf("length %u != %zu\n", *len, |
1099 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1100 | return -EINVAL; |
1101 | } | |
1102 | ||
1103 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1104 | return -EFAULT; | |
1105 | ||
1106 | name[IPT_TABLE_MAXNAMELEN-1] = '\0'; | |
1107 | #ifdef CONFIG_COMPAT | |
1108 | if (compat) | |
1109 | xt_compat_lock(AF_INET); | |
1110 | #endif | |
34bd137b | 1111 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1112 | "iptable_%s", name); |
2722971c DM |
1113 | if (t && !IS_ERR(t)) { |
1114 | struct ipt_getinfo info; | |
5452e425 | 1115 | const struct xt_table_info *private = t->private; |
2722971c DM |
1116 | |
1117 | #ifdef CONFIG_COMPAT | |
1118 | if (compat) { | |
1119 | struct xt_table_info tmp; | |
1120 | ret = compat_table_info(private, &tmp); | |
b386d9f5 | 1121 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1122 | private = &tmp; |
2722971c DM |
1123 | } |
1124 | #endif | |
1125 | info.valid_hooks = t->valid_hooks; | |
1126 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1127 | sizeof(info.hook_entry)); |
2722971c | 1128 | memcpy(info.underflow, private->underflow, |
4b478248 | 1129 | sizeof(info.underflow)); |
2722971c DM |
1130 | info.num_entries = private->number; |
1131 | info.size = private->size; | |
1132 | strcpy(info.name, name); | |
1133 | ||
1134 | if (copy_to_user(user, &info, *len) != 0) | |
1135 | ret = -EFAULT; | |
1136 | else | |
1137 | ret = 0; | |
1138 | ||
1139 | xt_table_unlock(t); | |
1140 | module_put(t->me); | |
1141 | } else | |
1142 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1143 | #ifdef CONFIG_COMPAT | |
1144 | if (compat) | |
1145 | xt_compat_unlock(AF_INET); | |
1146 | #endif | |
1147 | return ret; | |
1148 | } | |
1149 | ||
1150 | static int | |
34bd137b | 1151 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, int *len) |
2722971c DM |
1152 | { |
1153 | int ret; | |
1154 | struct ipt_get_entries get; | |
e60a13e0 | 1155 | struct xt_table *t; |
2722971c DM |
1156 | |
1157 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1158 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1159 | return -EINVAL; |
1160 | } | |
1161 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1162 | return -EFAULT; | |
1163 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1164 | duprintf("get_entries: %u != %zu\n", |
1165 | *len, sizeof(get) + get.size); | |
2722971c DM |
1166 | return -EINVAL; |
1167 | } | |
1168 | ||
34bd137b | 1169 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1170 | if (t && !IS_ERR(t)) { |
5452e425 | 1171 | const struct xt_table_info *private = t->private; |
9c547959 | 1172 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1173 | if (get.size == private->size) |
1174 | ret = copy_entries_to_user(private->size, | |
1175 | t, uptr->entrytable); | |
1176 | else { | |
1177 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1178 | private->size, get.size); |
544473c1 | 1179 | ret = -EAGAIN; |
2722971c DM |
1180 | } |
1181 | module_put(t->me); | |
1182 | xt_table_unlock(t); | |
1183 | } else | |
1184 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1185 | ||
1186 | return ret; | |
1187 | } | |
1188 | ||
1189 | static int | |
34bd137b | 1190 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1191 | struct xt_table_info *newinfo, unsigned int num_counters, |
1192 | void __user *counters_ptr) | |
2722971c DM |
1193 | { |
1194 | int ret; | |
e60a13e0 | 1195 | struct xt_table *t; |
2722971c DM |
1196 | struct xt_table_info *oldinfo; |
1197 | struct xt_counters *counters; | |
1198 | void *loc_cpu_old_entry; | |
1199 | ||
1200 | ret = 0; | |
1201 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); | |
1202 | if (!counters) { | |
1203 | ret = -ENOMEM; | |
1204 | goto out; | |
1205 | } | |
1206 | ||
34bd137b | 1207 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c DM |
1208 | "iptable_%s", name); |
1209 | if (!t || IS_ERR(t)) { | |
1210 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1211 | goto free_newinfo_counters_untrans; | |
1212 | } | |
1213 | ||
1214 | /* You lied! */ | |
1215 | if (valid_hooks != t->valid_hooks) { | |
1216 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1217 | valid_hooks, t->valid_hooks); | |
1218 | ret = -EINVAL; | |
1219 | goto put_module; | |
1220 | } | |
1221 | ||
1222 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1223 | if (!oldinfo) | |
1224 | goto put_module; | |
1225 | ||
1226 | /* Update module usage count based on number of rules */ | |
1227 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1228 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1229 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1230 | (newinfo->number <= oldinfo->initial_entries)) | |
1231 | module_put(t->me); | |
1232 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1233 | (newinfo->number <= oldinfo->initial_entries)) | |
1234 | module_put(t->me); | |
1235 | ||
1236 | /* Get the old counters. */ | |
1237 | get_counters(oldinfo, counters); | |
1238 | /* Decrease module usage counts and free resource */ | |
1239 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
4b478248 PM |
1240 | IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry, |
1241 | NULL); | |
2722971c DM |
1242 | xt_free_table_info(oldinfo); |
1243 | if (copy_to_user(counters_ptr, counters, | |
1244 | sizeof(struct xt_counters) * num_counters) != 0) | |
1245 | ret = -EFAULT; | |
1246 | vfree(counters); | |
1247 | xt_table_unlock(t); | |
1248 | return ret; | |
1249 | ||
1250 | put_module: | |
1251 | module_put(t->me); | |
1252 | xt_table_unlock(t); | |
1253 | free_newinfo_counters_untrans: | |
1254 | vfree(counters); | |
1255 | out: | |
1256 | return ret; | |
1257 | } | |
1258 | ||
1259 | static int | |
34bd137b | 1260 | do_replace(struct net *net, void __user *user, unsigned int len) |
2722971c DM |
1261 | { |
1262 | int ret; | |
1263 | struct ipt_replace tmp; | |
1264 | struct xt_table_info *newinfo; | |
1265 | void *loc_cpu_entry; | |
1266 | ||
1267 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1268 | return -EFAULT; | |
1269 | ||
2722971c | 1270 | /* overflow check */ |
2722971c DM |
1271 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1272 | return -ENOMEM; | |
1273 | ||
1274 | newinfo = xt_alloc_table_info(tmp.size); | |
1275 | if (!newinfo) | |
1276 | return -ENOMEM; | |
1277 | ||
9c547959 | 1278 | /* choose the copy that is on our node/cpu */ |
2722971c DM |
1279 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1280 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1281 | tmp.size) != 0) { | |
1282 | ret = -EFAULT; | |
1283 | goto free_newinfo; | |
1284 | } | |
1285 | ||
1286 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
1287 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, | |
1288 | tmp.hook_entry, tmp.underflow); | |
1289 | if (ret != 0) | |
1290 | goto free_newinfo; | |
1291 | ||
1292 | duprintf("ip_tables: Translated table\n"); | |
1293 | ||
34bd137b | 1294 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1295 | tmp.num_counters, tmp.counters); |
2722971c DM |
1296 | if (ret) |
1297 | goto free_newinfo_untrans; | |
1298 | return 0; | |
1299 | ||
1300 | free_newinfo_untrans: | |
9c547959 | 1301 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
2722971c DM |
1302 | free_newinfo: |
1303 | xt_free_table_info(newinfo); | |
1304 | return ret; | |
1305 | } | |
1306 | ||
1307 | /* We're lazy, and add to the first CPU; overflow works its fey magic | |
1308 | * and everything is OK. */ | |
022748a9 | 1309 | static int |
2722971c DM |
1310 | add_counter_to_entry(struct ipt_entry *e, |
1311 | const struct xt_counters addme[], | |
1312 | unsigned int *i) | |
1313 | { | |
1314 | #if 0 | |
1315 | duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n", | |
1316 | *i, | |
1317 | (long unsigned int)e->counters.pcnt, | |
1318 | (long unsigned int)e->counters.bcnt, | |
1319 | (long unsigned int)addme[*i].pcnt, | |
1320 | (long unsigned int)addme[*i].bcnt); | |
1321 | #endif | |
1322 | ||
1323 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1324 | ||
1325 | (*i)++; | |
1326 | return 0; | |
1327 | } | |
1328 | ||
1329 | static int | |
34bd137b | 1330 | do_add_counters(struct net *net, void __user *user, unsigned int len, int compat) |
2722971c DM |
1331 | { |
1332 | unsigned int i; | |
1333 | struct xt_counters_info tmp; | |
1334 | struct xt_counters *paddc; | |
1335 | unsigned int num_counters; | |
5452e425 | 1336 | const char *name; |
2722971c DM |
1337 | int size; |
1338 | void *ptmp; | |
e60a13e0 | 1339 | struct xt_table *t; |
5452e425 | 1340 | const struct xt_table_info *private; |
2722971c DM |
1341 | int ret = 0; |
1342 | void *loc_cpu_entry; | |
1343 | #ifdef CONFIG_COMPAT | |
1344 | struct compat_xt_counters_info compat_tmp; | |
1345 | ||
1346 | if (compat) { | |
1347 | ptmp = &compat_tmp; | |
1348 | size = sizeof(struct compat_xt_counters_info); | |
1349 | } else | |
1350 | #endif | |
1351 | { | |
1352 | ptmp = &tmp; | |
1353 | size = sizeof(struct xt_counters_info); | |
1354 | } | |
1355 | ||
1356 | if (copy_from_user(ptmp, user, size) != 0) | |
1357 | return -EFAULT; | |
1358 | ||
1359 | #ifdef CONFIG_COMPAT | |
1360 | if (compat) { | |
1361 | num_counters = compat_tmp.num_counters; | |
1362 | name = compat_tmp.name; | |
1363 | } else | |
1364 | #endif | |
1365 | { | |
1366 | num_counters = tmp.num_counters; | |
1367 | name = tmp.name; | |
1368 | } | |
1369 | ||
1370 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1371 | return -EINVAL; | |
1372 | ||
1373 | paddc = vmalloc_node(len - size, numa_node_id()); | |
1374 | if (!paddc) | |
1375 | return -ENOMEM; | |
1376 | ||
1377 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1378 | ret = -EFAULT; | |
1379 | goto free; | |
1380 | } | |
1381 | ||
34bd137b | 1382 | t = xt_find_table_lock(net, AF_INET, name); |
2722971c DM |
1383 | if (!t || IS_ERR(t)) { |
1384 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1385 | goto free; | |
1386 | } | |
1387 | ||
1388 | write_lock_bh(&t->lock); | |
1389 | private = t->private; | |
1390 | if (private->number != num_counters) { | |
1391 | ret = -EINVAL; | |
1392 | goto unlock_up_free; | |
1393 | } | |
1394 | ||
1395 | i = 0; | |
1396 | /* Choose the copy that is on our node */ | |
1397 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1398 | IPT_ENTRY_ITERATE(loc_cpu_entry, | |
1399 | private->size, | |
1400 | add_counter_to_entry, | |
1401 | paddc, | |
1402 | &i); | |
1403 | unlock_up_free: | |
1404 | write_unlock_bh(&t->lock); | |
1405 | xt_table_unlock(t); | |
1406 | module_put(t->me); | |
1407 | free: | |
1408 | vfree(paddc); | |
1409 | ||
1410 | return ret; | |
1411 | } | |
1412 | ||
1413 | #ifdef CONFIG_COMPAT | |
1414 | struct compat_ipt_replace { | |
1415 | char name[IPT_TABLE_MAXNAMELEN]; | |
1416 | u32 valid_hooks; | |
1417 | u32 num_entries; | |
1418 | u32 size; | |
6e23ae2a PM |
1419 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1420 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c DM |
1421 | u32 num_counters; |
1422 | compat_uptr_t counters; /* struct ipt_counters * */ | |
1423 | struct compat_ipt_entry entries[0]; | |
1424 | }; | |
1425 | ||
a18aa31b PM |
1426 | static int |
1427 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1428 | unsigned int *size, struct xt_counters *counters, |
a18aa31b | 1429 | unsigned int *i) |
2722971c | 1430 | { |
3e597c60 | 1431 | struct ipt_entry_target *t; |
2722971c DM |
1432 | struct compat_ipt_entry __user *ce; |
1433 | u_int16_t target_offset, next_offset; | |
1434 | compat_uint_t origsize; | |
1435 | int ret; | |
1436 | ||
1437 | ret = -EFAULT; | |
1438 | origsize = *size; | |
1439 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
7800007c | 1440 | if (copy_to_user(ce, e, sizeof(struct ipt_entry))) |
2722971c DM |
1441 | goto out; |
1442 | ||
a18aa31b PM |
1443 | if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i]))) |
1444 | goto out; | |
1445 | ||
2722971c | 1446 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1447 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1448 | ||
ac8e27fd | 1449 | ret = IPT_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size); |
2722971c DM |
1450 | target_offset = e->target_offset - (origsize - *size); |
1451 | if (ret) | |
1452 | goto out; | |
1453 | t = ipt_get_target(e); | |
9fa492cd | 1454 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c DM |
1455 | if (ret) |
1456 | goto out; | |
1457 | ret = -EFAULT; | |
1458 | next_offset = e->next_offset - (origsize - *size); | |
7800007c | 1459 | if (put_user(target_offset, &ce->target_offset)) |
2722971c | 1460 | goto out; |
7800007c | 1461 | if (put_user(next_offset, &ce->next_offset)) |
2722971c | 1462 | goto out; |
a18aa31b PM |
1463 | |
1464 | (*i)++; | |
2722971c DM |
1465 | return 0; |
1466 | out: | |
1467 | return ret; | |
1468 | } | |
1469 | ||
022748a9 | 1470 | static int |
4c1b52bc | 1471 | compat_find_calc_match(struct ipt_entry_match *m, |
4b478248 PM |
1472 | const char *name, |
1473 | const struct ipt_ip *ip, | |
1474 | unsigned int hookmask, | |
b0a6363c | 1475 | int *size, unsigned int *i) |
2722971c | 1476 | { |
6709dbbb | 1477 | struct xt_match *match; |
2722971c DM |
1478 | |
1479 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, | |
4b478248 | 1480 | m->u.user.revision), |
2722971c DM |
1481 | "ipt_%s", m->u.user.name); |
1482 | if (IS_ERR(match) || !match) { | |
1483 | duprintf("compat_check_calc_match: `%s' not found\n", | |
4b478248 | 1484 | m->u.user.name); |
2722971c DM |
1485 | return match ? PTR_ERR(match) : -ENOENT; |
1486 | } | |
1487 | m->u.kernel.match = match; | |
9fa492cd | 1488 | *size += xt_compat_match_offset(match); |
2722971c DM |
1489 | |
1490 | (*i)++; | |
1491 | return 0; | |
1492 | } | |
1493 | ||
022748a9 | 1494 | static int |
4c1b52bc DM |
1495 | compat_release_match(struct ipt_entry_match *m, unsigned int *i) |
1496 | { | |
1497 | if (i && (*i)-- == 0) | |
1498 | return 1; | |
1499 | ||
1500 | module_put(m->u.kernel.match->me); | |
1501 | return 0; | |
1502 | } | |
1503 | ||
022748a9 | 1504 | static int |
73cd598d | 1505 | compat_release_entry(struct compat_ipt_entry *e, unsigned int *i) |
4c1b52bc DM |
1506 | { |
1507 | struct ipt_entry_target *t; | |
1508 | ||
1509 | if (i && (*i)-- == 0) | |
1510 | return 1; | |
1511 | ||
1512 | /* Cleanup all matches */ | |
73cd598d PM |
1513 | COMPAT_IPT_MATCH_ITERATE(e, compat_release_match, NULL); |
1514 | t = compat_ipt_get_target(e); | |
4c1b52bc DM |
1515 | module_put(t->u.kernel.target->me); |
1516 | return 0; | |
1517 | } | |
1518 | ||
022748a9 | 1519 | static int |
73cd598d | 1520 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1521 | struct xt_table_info *newinfo, |
1522 | unsigned int *size, | |
1523 | unsigned char *base, | |
1524 | unsigned char *limit, | |
1525 | unsigned int *hook_entries, | |
1526 | unsigned int *underflows, | |
1527 | unsigned int *i, | |
1528 | const char *name) | |
2722971c DM |
1529 | { |
1530 | struct ipt_entry_target *t; | |
6709dbbb | 1531 | struct xt_target *target; |
e5b5ef7d | 1532 | unsigned int entry_offset; |
b0a6363c PM |
1533 | unsigned int j; |
1534 | int ret, off, h; | |
2722971c DM |
1535 | |
1536 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
1537 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 | |
1538 | || (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { | |
1539 | duprintf("Bad offset %p, limit = %p\n", e, limit); | |
1540 | return -EINVAL; | |
1541 | } | |
1542 | ||
1543 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1544 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1545 | duprintf("checking: element %p size %u\n", |
1546 | e, e->next_offset); | |
1547 | return -EINVAL; | |
1548 | } | |
1549 | ||
73cd598d PM |
1550 | /* For purposes of check_entry casting the compat entry is fine */ |
1551 | ret = check_entry((struct ipt_entry *)e, name); | |
a96be246 DM |
1552 | if (ret) |
1553 | return ret; | |
590bdf7f | 1554 | |
30c08c41 | 1555 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1556 | entry_offset = (void *)e - (void *)base; |
1557 | j = 0; | |
73cd598d PM |
1558 | ret = COMPAT_IPT_MATCH_ITERATE(e, compat_find_calc_match, name, |
1559 | &e->ip, e->comefrom, &off, &j); | |
2722971c | 1560 | if (ret != 0) |
4c1b52bc | 1561 | goto release_matches; |
2722971c | 1562 | |
73cd598d | 1563 | t = compat_ipt_get_target(e); |
2722971c | 1564 | target = try_then_request_module(xt_find_target(AF_INET, |
4b478248 PM |
1565 | t->u.user.name, |
1566 | t->u.user.revision), | |
2722971c DM |
1567 | "ipt_%s", t->u.user.name); |
1568 | if (IS_ERR(target) || !target) { | |
a96be246 | 1569 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1570 | t->u.user.name); |
2722971c | 1571 | ret = target ? PTR_ERR(target) : -ENOENT; |
4c1b52bc | 1572 | goto release_matches; |
2722971c DM |
1573 | } |
1574 | t->u.kernel.target = target; | |
1575 | ||
9fa492cd | 1576 | off += xt_compat_target_offset(target); |
2722971c | 1577 | *size += off; |
b386d9f5 | 1578 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1579 | if (ret) |
1580 | goto out; | |
1581 | ||
1582 | /* Check hooks & underflows */ | |
6e23ae2a | 1583 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1584 | if ((unsigned char *)e - base == hook_entries[h]) |
1585 | newinfo->hook_entry[h] = hook_entries[h]; | |
1586 | if ((unsigned char *)e - base == underflows[h]) | |
1587 | newinfo->underflow[h] = underflows[h]; | |
1588 | } | |
1589 | ||
1590 | /* Clear counters and comefrom */ | |
73cd598d | 1591 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c DM |
1592 | e->comefrom = 0; |
1593 | ||
1594 | (*i)++; | |
1595 | return 0; | |
bec71b16 | 1596 | |
2722971c | 1597 | out: |
bec71b16 | 1598 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1599 | release_matches: |
1600 | IPT_MATCH_ITERATE(e, compat_release_match, &j); | |
2722971c DM |
1601 | return ret; |
1602 | } | |
1603 | ||
4b478248 | 1604 | static int |
73cd598d | 1605 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1606 | unsigned int *size, const char *name, |
1607 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c DM |
1608 | { |
1609 | struct ipt_entry_target *t; | |
6709dbbb | 1610 | struct xt_target *target; |
2722971c DM |
1611 | struct ipt_entry *de; |
1612 | unsigned int origsize; | |
920b868a | 1613 | int ret, h; |
2722971c DM |
1614 | |
1615 | ret = 0; | |
1616 | origsize = *size; | |
1617 | de = (struct ipt_entry *)*dstptr; | |
1618 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1619 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1620 | |
73cd598d | 1621 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1622 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1623 | ||
73cd598d PM |
1624 | ret = COMPAT_IPT_MATCH_ITERATE(e, xt_compat_match_from_user, |
1625 | dstptr, size); | |
2722971c | 1626 | if (ret) |
f6677f43 | 1627 | return ret; |
2722971c | 1628 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1629 | t = compat_ipt_get_target(e); |
2722971c | 1630 | target = t->u.kernel.target; |
9fa492cd | 1631 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1632 | |
1633 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1634 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1635 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1636 | newinfo->hook_entry[h] -= origsize - *size; | |
1637 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1638 | newinfo->underflow[h] -= origsize - *size; | |
1639 | } | |
f6677f43 DM |
1640 | return ret; |
1641 | } | |
1642 | ||
022748a9 DV |
1643 | static int |
1644 | compat_check_entry(struct ipt_entry *e, const char *name, | |
4b478248 | 1645 | unsigned int *i) |
f6677f43 | 1646 | { |
b0a6363c PM |
1647 | unsigned int j; |
1648 | int ret; | |
f6677f43 | 1649 | |
4c1b52bc | 1650 | j = 0; |
9c547959 PM |
1651 | ret = IPT_MATCH_ITERATE(e, check_match, name, &e->ip, |
1652 | e->comefrom, &j); | |
f6677f43 | 1653 | if (ret) |
4c1b52bc DM |
1654 | goto cleanup_matches; |
1655 | ||
1656 | ret = check_target(e, name); | |
1657 | if (ret) | |
1658 | goto cleanup_matches; | |
f6677f43 | 1659 | |
4c1b52bc DM |
1660 | (*i)++; |
1661 | return 0; | |
1662 | ||
1663 | cleanup_matches: | |
1664 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
1665 | return ret; | |
f6677f43 DM |
1666 | } |
1667 | ||
1da177e4 | 1668 | static int |
2722971c | 1669 | translate_compat_table(const char *name, |
4b478248 PM |
1670 | unsigned int valid_hooks, |
1671 | struct xt_table_info **pinfo, | |
1672 | void **pentry0, | |
1673 | unsigned int total_size, | |
1674 | unsigned int number, | |
1675 | unsigned int *hook_entries, | |
1676 | unsigned int *underflows) | |
1da177e4 | 1677 | { |
920b868a | 1678 | unsigned int i, j; |
2722971c DM |
1679 | struct xt_table_info *newinfo, *info; |
1680 | void *pos, *entry0, *entry1; | |
1681 | unsigned int size; | |
1da177e4 | 1682 | int ret; |
1da177e4 | 1683 | |
2722971c DM |
1684 | info = *pinfo; |
1685 | entry0 = *pentry0; | |
1686 | size = total_size; | |
1687 | info->number = number; | |
1688 | ||
1689 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1690 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1691 | info->hook_entry[i] = 0xFFFFFFFF; |
1692 | info->underflow[i] = 0xFFFFFFFF; | |
1693 | } | |
1694 | ||
1695 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1696 | j = 0; |
2722971c DM |
1697 | xt_compat_lock(AF_INET); |
1698 | /* Walk through entries, checking offsets. */ | |
73cd598d PM |
1699 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
1700 | check_compat_entry_size_and_hooks, | |
1701 | info, &size, entry0, | |
1702 | entry0 + total_size, | |
1703 | hook_entries, underflows, &j, name); | |
2722971c DM |
1704 | if (ret != 0) |
1705 | goto out_unlock; | |
1706 | ||
1707 | ret = -EINVAL; | |
920b868a | 1708 | if (j != number) { |
2722971c | 1709 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1710 | j, number); |
2722971c DM |
1711 | goto out_unlock; |
1712 | } | |
1713 | ||
1714 | /* Check hooks all assigned */ | |
6e23ae2a | 1715 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1716 | /* Only hooks which are valid */ |
1717 | if (!(valid_hooks & (1 << i))) | |
1718 | continue; | |
1719 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1720 | duprintf("Invalid hook entry %u %u\n", | |
1721 | i, hook_entries[i]); | |
1722 | goto out_unlock; | |
1da177e4 | 1723 | } |
2722971c DM |
1724 | if (info->underflow[i] == 0xFFFFFFFF) { |
1725 | duprintf("Invalid underflow %u %u\n", | |
1726 | i, underflows[i]); | |
1727 | goto out_unlock; | |
1728 | } | |
1729 | } | |
1730 | ||
1731 | ret = -ENOMEM; | |
1732 | newinfo = xt_alloc_table_info(size); | |
1733 | if (!newinfo) | |
1734 | goto out_unlock; | |
1735 | ||
1736 | newinfo->number = number; | |
6e23ae2a | 1737 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1738 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1739 | newinfo->underflow[i] = info->underflow[i]; | |
1740 | } | |
1741 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1742 | pos = entry1; | |
4b478248 | 1743 | size = total_size; |
73cd598d | 1744 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
9c547959 PM |
1745 | compat_copy_entry_from_user, |
1746 | &pos, &size, name, newinfo, entry1); | |
b386d9f5 | 1747 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1748 | xt_compat_unlock(AF_INET); |
1749 | if (ret) | |
1750 | goto free_newinfo; | |
1751 | ||
1752 | ret = -ELOOP; | |
1753 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1754 | goto free_newinfo; | |
1755 | ||
4c1b52bc | 1756 | i = 0; |
f6677f43 | 1757 | ret = IPT_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry, |
4b478248 | 1758 | name, &i); |
4c1b52bc DM |
1759 | if (ret) { |
1760 | j -= i; | |
73cd598d PM |
1761 | COMPAT_IPT_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i, |
1762 | compat_release_entry, &j); | |
4c1b52bc DM |
1763 | IPT_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i); |
1764 | xt_free_table_info(newinfo); | |
1765 | return ret; | |
1766 | } | |
f6677f43 | 1767 | |
2722971c | 1768 | /* And one copy for every other CPU */ |
fb1bb34d | 1769 | for_each_possible_cpu(i) |
2722971c DM |
1770 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1771 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1772 | ||
1773 | *pinfo = newinfo; | |
1774 | *pentry0 = entry1; | |
1775 | xt_free_table_info(info); | |
1776 | return 0; | |
1da177e4 | 1777 | |
2722971c DM |
1778 | free_newinfo: |
1779 | xt_free_table_info(newinfo); | |
1780 | out: | |
73cd598d | 1781 | COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j); |
1da177e4 | 1782 | return ret; |
2722971c | 1783 | out_unlock: |
b386d9f5 | 1784 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1785 | xt_compat_unlock(AF_INET); |
1786 | goto out; | |
1da177e4 LT |
1787 | } |
1788 | ||
1789 | static int | |
34bd137b | 1790 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1791 | { |
1792 | int ret; | |
2722971c DM |
1793 | struct compat_ipt_replace tmp; |
1794 | struct xt_table_info *newinfo; | |
1795 | void *loc_cpu_entry; | |
1da177e4 LT |
1796 | |
1797 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1798 | return -EFAULT; | |
1799 | ||
ee4bb818 | 1800 | /* overflow check */ |
259d4e41 | 1801 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1802 | return -ENOMEM; |
1803 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1804 | return -ENOMEM; | |
1805 | ||
2e4e6a17 | 1806 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1807 | if (!newinfo) |
1808 | return -ENOMEM; | |
1809 | ||
9c547959 | 1810 | /* choose the copy that is on our node/cpu */ |
31836064 ED |
1811 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1812 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1813 | tmp.size) != 0) { |
1814 | ret = -EFAULT; | |
1815 | goto free_newinfo; | |
1816 | } | |
1817 | ||
2722971c | 1818 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, |
4b478248 PM |
1819 | &newinfo, &loc_cpu_entry, tmp.size, |
1820 | tmp.num_entries, tmp.hook_entry, | |
1821 | tmp.underflow); | |
2722971c | 1822 | if (ret != 0) |
1da177e4 | 1823 | goto free_newinfo; |
1da177e4 | 1824 | |
2722971c | 1825 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1826 | |
34bd137b | 1827 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1828 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1829 | if (ret) |
1830 | goto free_newinfo_untrans; | |
1831 | return 0; | |
1da177e4 | 1832 | |
2722971c | 1833 | free_newinfo_untrans: |
4b478248 | 1834 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
2722971c DM |
1835 | free_newinfo: |
1836 | xt_free_table_info(newinfo); | |
1837 | return ret; | |
1838 | } | |
1da177e4 | 1839 | |
2722971c DM |
1840 | static int |
1841 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1842 | unsigned int len) |
2722971c DM |
1843 | { |
1844 | int ret; | |
1da177e4 | 1845 | |
2722971c DM |
1846 | if (!capable(CAP_NET_ADMIN)) |
1847 | return -EPERM; | |
1da177e4 | 1848 | |
2722971c DM |
1849 | switch (cmd) { |
1850 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1851 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1852 | break; |
1da177e4 | 1853 | |
2722971c | 1854 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1855 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1856 | break; |
1857 | ||
1858 | default: | |
1859 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1860 | ret = -EINVAL; | |
1861 | } | |
1da177e4 | 1862 | |
1da177e4 LT |
1863 | return ret; |
1864 | } | |
1865 | ||
4b478248 | 1866 | struct compat_ipt_get_entries { |
2722971c DM |
1867 | char name[IPT_TABLE_MAXNAMELEN]; |
1868 | compat_uint_t size; | |
1869 | struct compat_ipt_entry entrytable[0]; | |
1870 | }; | |
1da177e4 | 1871 | |
4b478248 PM |
1872 | static int |
1873 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1874 | void __user *userptr) | |
2722971c | 1875 | { |
2722971c | 1876 | struct xt_counters *counters; |
5452e425 | 1877 | const struct xt_table_info *private = table->private; |
2722971c DM |
1878 | void __user *pos; |
1879 | unsigned int size; | |
1880 | int ret = 0; | |
5452e425 | 1881 | const void *loc_cpu_entry; |
a18aa31b | 1882 | unsigned int i = 0; |
1da177e4 | 1883 | |
2722971c DM |
1884 | counters = alloc_counters(table); |
1885 | if (IS_ERR(counters)) | |
1886 | return PTR_ERR(counters); | |
1887 | ||
1888 | /* choose the copy that is on our node/cpu, ... | |
1889 | * This choice is lazy (because current thread is | |
1890 | * allowed to migrate to another cpu) | |
1891 | */ | |
1892 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1893 | pos = userptr; | |
1894 | size = total_size; | |
1895 | ret = IPT_ENTRY_ITERATE(loc_cpu_entry, total_size, | |
a18aa31b PM |
1896 | compat_copy_entry_to_user, |
1897 | &pos, &size, counters, &i); | |
2722971c | 1898 | |
2722971c DM |
1899 | vfree(counters); |
1900 | return ret; | |
1da177e4 LT |
1901 | } |
1902 | ||
1903 | static int | |
34bd137b AD |
1904 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1905 | int *len) | |
1da177e4 | 1906 | { |
2722971c DM |
1907 | int ret; |
1908 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1909 | struct xt_table *t; |
1da177e4 | 1910 | |
2722971c | 1911 | if (*len < sizeof(get)) { |
c9d8fe13 | 1912 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1913 | return -EINVAL; |
2722971c | 1914 | } |
1da177e4 | 1915 | |
2722971c DM |
1916 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1917 | return -EFAULT; | |
1da177e4 | 1918 | |
2722971c | 1919 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1920 | duprintf("compat_get_entries: %u != %zu\n", |
1921 | *len, sizeof(get) + get.size); | |
2722971c | 1922 | return -EINVAL; |
1da177e4 LT |
1923 | } |
1924 | ||
2722971c | 1925 | xt_compat_lock(AF_INET); |
34bd137b | 1926 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1927 | if (t && !IS_ERR(t)) { |
5452e425 | 1928 | const struct xt_table_info *private = t->private; |
2722971c | 1929 | struct xt_table_info info; |
9c547959 | 1930 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1931 | ret = compat_table_info(private, &info); |
1932 | if (!ret && get.size == info.size) { | |
1933 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 1934 | t, uptr->entrytable); |
2722971c DM |
1935 | } else if (!ret) { |
1936 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1937 | private->size, get.size); |
544473c1 | 1938 | ret = -EAGAIN; |
2722971c | 1939 | } |
b386d9f5 | 1940 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1941 | module_put(t->me); |
1942 | xt_table_unlock(t); | |
1943 | } else | |
1da177e4 | 1944 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1945 | |
2722971c DM |
1946 | xt_compat_unlock(AF_INET); |
1947 | return ret; | |
1948 | } | |
1da177e4 | 1949 | |
79030ed0 PM |
1950 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1951 | ||
2722971c DM |
1952 | static int |
1953 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1954 | { | |
1955 | int ret; | |
1da177e4 | 1956 | |
82fac054 BS |
1957 | if (!capable(CAP_NET_ADMIN)) |
1958 | return -EPERM; | |
1959 | ||
2722971c DM |
1960 | switch (cmd) { |
1961 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1962 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1963 | break; |
1964 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1965 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1966 | break; |
1967 | default: | |
79030ed0 | 1968 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1969 | } |
1da177e4 LT |
1970 | return ret; |
1971 | } | |
2722971c | 1972 | #endif |
1da177e4 LT |
1973 | |
1974 | static int | |
9c547959 | 1975 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
1976 | { |
1977 | int ret; | |
1978 | ||
1979 | if (!capable(CAP_NET_ADMIN)) | |
1980 | return -EPERM; | |
1981 | ||
1982 | switch (cmd) { | |
1983 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1984 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1985 | break; |
1986 | ||
1987 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1988 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
1989 | break; |
1990 | ||
1991 | default: | |
1992 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1993 | ret = -EINVAL; | |
1994 | } | |
1995 | ||
1996 | return ret; | |
1997 | } | |
1998 | ||
1999 | static int | |
2000 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2001 | { | |
2002 | int ret; | |
2003 | ||
2004 | if (!capable(CAP_NET_ADMIN)) | |
2005 | return -EPERM; | |
2006 | ||
2007 | switch (cmd) { | |
2722971c | 2008 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2009 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2010 | break; |
1da177e4 | 2011 | |
2722971c | 2012 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2013 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2014 | break; |
1da177e4 LT |
2015 | |
2016 | case IPT_SO_GET_REVISION_MATCH: | |
2017 | case IPT_SO_GET_REVISION_TARGET: { | |
2018 | struct ipt_get_revision rev; | |
2e4e6a17 | 2019 | int target; |
1da177e4 LT |
2020 | |
2021 | if (*len != sizeof(rev)) { | |
2022 | ret = -EINVAL; | |
2023 | break; | |
2024 | } | |
2025 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2026 | ret = -EFAULT; | |
2027 | break; | |
2028 | } | |
2029 | ||
2030 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2031 | target = 1; |
1da177e4 | 2032 | else |
2e4e6a17 | 2033 | target = 0; |
1da177e4 | 2034 | |
2e4e6a17 HW |
2035 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2036 | rev.revision, | |
2037 | target, &ret), | |
1da177e4 LT |
2038 | "ipt_%s", rev.name); |
2039 | break; | |
2040 | } | |
2041 | ||
2042 | default: | |
2043 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2044 | ret = -EINVAL; | |
2045 | } | |
2046 | ||
2047 | return ret; | |
2048 | } | |
2049 | ||
44d34e72 AD |
2050 | struct xt_table *ipt_register_table(struct net *net, struct xt_table *table, |
2051 | const struct ipt_replace *repl) | |
1da177e4 LT |
2052 | { |
2053 | int ret; | |
2e4e6a17 | 2054 | struct xt_table_info *newinfo; |
259d4e41 | 2055 | struct xt_table_info bootstrap |
1da177e4 | 2056 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2057 | void *loc_cpu_entry; |
a98da11d | 2058 | struct xt_table *new_table; |
1da177e4 | 2059 | |
2e4e6a17 | 2060 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2061 | if (!newinfo) { |
2062 | ret = -ENOMEM; | |
2063 | goto out; | |
2064 | } | |
1da177e4 | 2065 | |
9c547959 | 2066 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2067 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2068 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
2069 | |
2070 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 2071 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
2072 | repl->num_entries, |
2073 | repl->hook_entry, | |
2074 | repl->underflow); | |
44d34e72 AD |
2075 | if (ret != 0) |
2076 | goto out_free; | |
1da177e4 | 2077 | |
44d34e72 | 2078 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2079 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2080 | ret = PTR_ERR(new_table); |
2081 | goto out_free; | |
1da177e4 LT |
2082 | } |
2083 | ||
44d34e72 AD |
2084 | return new_table; |
2085 | ||
2086 | out_free: | |
2087 | xt_free_table_info(newinfo); | |
2088 | out: | |
2089 | return ERR_PTR(ret); | |
1da177e4 LT |
2090 | } |
2091 | ||
e60a13e0 | 2092 | void ipt_unregister_table(struct xt_table *table) |
1da177e4 | 2093 | { |
2e4e6a17 | 2094 | struct xt_table_info *private; |
31836064 | 2095 | void *loc_cpu_entry; |
df200969 | 2096 | struct module *table_owner = table->me; |
31836064 | 2097 | |
e905a9ed | 2098 | private = xt_unregister_table(table); |
1da177e4 LT |
2099 | |
2100 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
2101 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
2102 | IPT_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
df200969 AD |
2103 | if (private->number > private->initial_entries) |
2104 | module_put(table_owner); | |
2e4e6a17 | 2105 | xt_free_table_info(private); |
1da177e4 LT |
2106 | } |
2107 | ||
2108 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2109 | static inline bool |
1da177e4 LT |
2110 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2111 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2112 | bool invert) |
1da177e4 | 2113 | { |
9c547959 PM |
2114 | return ((test_type == 0xFF) || |
2115 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2116 | ^ invert; |
2117 | } | |
2118 | ||
1d93a9cb | 2119 | static bool |
f7108a20 | 2120 | icmp_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2121 | { |
5452e425 JE |
2122 | const struct icmphdr *ic; |
2123 | struct icmphdr _icmph; | |
f7108a20 | 2124 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2125 | |
2126 | /* Must not be a fragment. */ | |
f7108a20 | 2127 | if (par->fragoff != 0) |
1d93a9cb | 2128 | return false; |
1da177e4 | 2129 | |
f7108a20 | 2130 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2131 | if (ic == NULL) { |
2132 | /* We've been asked to examine this packet, and we | |
2133 | * can't. Hence, no choice but to drop. | |
2134 | */ | |
2135 | duprintf("Dropping evil ICMP tinygram.\n"); | |
f7108a20 | 2136 | *par->hotdrop = true; |
1d93a9cb | 2137 | return false; |
1da177e4 LT |
2138 | } |
2139 | ||
2140 | return icmp_type_code_match(icmpinfo->type, | |
2141 | icmpinfo->code[0], | |
2142 | icmpinfo->code[1], | |
2143 | ic->type, ic->code, | |
2144 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2145 | } | |
2146 | ||
2147 | /* Called when user tries to insert an entry of this type. */ | |
ccb79bdc | 2148 | static bool |
1da177e4 | 2149 | icmp_checkentry(const char *tablename, |
9c547959 | 2150 | const void *entry, |
c4986734 | 2151 | const struct xt_match *match, |
1da177e4 | 2152 | void *matchinfo, |
1da177e4 LT |
2153 | unsigned int hook_mask) |
2154 | { | |
2155 | const struct ipt_icmp *icmpinfo = matchinfo; | |
2156 | ||
1d5cd909 PM |
2157 | /* Must specify no unknown invflags */ |
2158 | return !(icmpinfo->invflags & ~IPT_ICMP_INV); | |
1da177e4 LT |
2159 | } |
2160 | ||
2161 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2162 | static struct xt_target ipt_standard_target __read_mostly = { |
1da177e4 | 2163 | .name = IPT_STANDARD_TARGET, |
1d5cd909 | 2164 | .targetsize = sizeof(int), |
a45049c5 | 2165 | .family = AF_INET, |
2722971c | 2166 | #ifdef CONFIG_COMPAT |
9fa492cd PM |
2167 | .compatsize = sizeof(compat_int_t), |
2168 | .compat_from_user = compat_standard_from_user, | |
2169 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2170 | #endif |
1da177e4 LT |
2171 | }; |
2172 | ||
9f15c530 | 2173 | static struct xt_target ipt_error_target __read_mostly = { |
1da177e4 LT |
2174 | .name = IPT_ERROR_TARGET, |
2175 | .target = ipt_error, | |
1d5cd909 | 2176 | .targetsize = IPT_FUNCTION_MAXNAMELEN, |
a45049c5 | 2177 | .family = AF_INET, |
1da177e4 LT |
2178 | }; |
2179 | ||
2180 | static struct nf_sockopt_ops ipt_sockopts = { | |
2181 | .pf = PF_INET, | |
2182 | .set_optmin = IPT_BASE_CTL, | |
2183 | .set_optmax = IPT_SO_SET_MAX+1, | |
2184 | .set = do_ipt_set_ctl, | |
2722971c DM |
2185 | #ifdef CONFIG_COMPAT |
2186 | .compat_set = compat_do_ipt_set_ctl, | |
2187 | #endif | |
1da177e4 LT |
2188 | .get_optmin = IPT_BASE_CTL, |
2189 | .get_optmax = IPT_SO_GET_MAX+1, | |
2190 | .get = do_ipt_get_ctl, | |
2722971c DM |
2191 | #ifdef CONFIG_COMPAT |
2192 | .compat_get = compat_do_ipt_get_ctl, | |
2193 | #endif | |
16fcec35 | 2194 | .owner = THIS_MODULE, |
1da177e4 LT |
2195 | }; |
2196 | ||
9f15c530 | 2197 | static struct xt_match icmp_matchstruct __read_mostly = { |
1da177e4 | 2198 | .name = "icmp", |
1d5cd909 PM |
2199 | .match = icmp_match, |
2200 | .matchsize = sizeof(struct ipt_icmp), | |
9c547959 | 2201 | .checkentry = icmp_checkentry, |
1d5cd909 | 2202 | .proto = IPPROTO_ICMP, |
a45049c5 | 2203 | .family = AF_INET, |
1da177e4 LT |
2204 | }; |
2205 | ||
3cb609d5 AD |
2206 | static int __net_init ip_tables_net_init(struct net *net) |
2207 | { | |
2208 | return xt_proto_init(net, AF_INET); | |
2209 | } | |
2210 | ||
2211 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2212 | { | |
2213 | xt_proto_fini(net, AF_INET); | |
2214 | } | |
2215 | ||
2216 | static struct pernet_operations ip_tables_net_ops = { | |
2217 | .init = ip_tables_net_init, | |
2218 | .exit = ip_tables_net_exit, | |
2219 | }; | |
2220 | ||
65b4b4e8 | 2221 | static int __init ip_tables_init(void) |
1da177e4 LT |
2222 | { |
2223 | int ret; | |
2224 | ||
3cb609d5 | 2225 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2226 | if (ret < 0) |
2227 | goto err1; | |
2e4e6a17 | 2228 | |
1da177e4 | 2229 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2230 | ret = xt_register_target(&ipt_standard_target); |
2231 | if (ret < 0) | |
2232 | goto err2; | |
2233 | ret = xt_register_target(&ipt_error_target); | |
2234 | if (ret < 0) | |
2235 | goto err3; | |
2236 | ret = xt_register_match(&icmp_matchstruct); | |
2237 | if (ret < 0) | |
2238 | goto err4; | |
1da177e4 LT |
2239 | |
2240 | /* Register setsockopt */ | |
2241 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2242 | if (ret < 0) |
2243 | goto err5; | |
1da177e4 | 2244 | |
0236e667 | 2245 | printk(KERN_INFO "ip_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2246 | return 0; |
0eff66e6 PM |
2247 | |
2248 | err5: | |
2249 | xt_unregister_match(&icmp_matchstruct); | |
2250 | err4: | |
2251 | xt_unregister_target(&ipt_error_target); | |
2252 | err3: | |
2253 | xt_unregister_target(&ipt_standard_target); | |
2254 | err2: | |
3cb609d5 | 2255 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2256 | err1: |
2257 | return ret; | |
1da177e4 LT |
2258 | } |
2259 | ||
65b4b4e8 | 2260 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2261 | { |
2262 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2263 | |
a45049c5 PNA |
2264 | xt_unregister_match(&icmp_matchstruct); |
2265 | xt_unregister_target(&ipt_error_target); | |
2266 | xt_unregister_target(&ipt_standard_target); | |
2e4e6a17 | 2267 | |
3cb609d5 | 2268 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2269 | } |
2270 | ||
2271 | EXPORT_SYMBOL(ipt_register_table); | |
2272 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2273 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2274 | module_init(ip_tables_init); |
2275 | module_exit(ip_tables_fini); |