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 | ||
08361aa8 ED |
77 | static unsigned long ifname_compare(const char *_a, const char *_b, |
78 | const unsigned char *_mask) | |
79 | { | |
80 | const unsigned long *a = (const unsigned long *)_a; | |
81 | const unsigned long *b = (const unsigned long *)_b; | |
82 | const unsigned long *mask = (const unsigned long *)_mask; | |
83 | unsigned long ret; | |
84 | ||
85 | ret = (a[0] ^ b[0]) & mask[0]; | |
86 | if (IFNAMSIZ > sizeof(unsigned long)) | |
87 | ret |= (a[1] ^ b[1]) & mask[1]; | |
88 | if (IFNAMSIZ > 2 * sizeof(unsigned long)) | |
89 | ret |= (a[2] ^ b[2]) & mask[2]; | |
90 | if (IFNAMSIZ > 3 * sizeof(unsigned long)) | |
91 | ret |= (a[3] ^ b[3]) & mask[3]; | |
92 | BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long)); | |
93 | return ret; | |
94 | } | |
95 | ||
1da177e4 | 96 | /* Returns whether matches rule or not. */ |
022748a9 | 97 | /* Performance critical - called for every packet */ |
9c547959 | 98 | static inline bool |
1da177e4 LT |
99 | ip_packet_match(const struct iphdr *ip, |
100 | const char *indev, | |
101 | const char *outdev, | |
102 | const struct ipt_ip *ipinfo, | |
103 | int isfrag) | |
104 | { | |
1da177e4 LT |
105 | unsigned long ret; |
106 | ||
e79ec50b | 107 | #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) |
1da177e4 LT |
108 | |
109 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, | |
110 | IPT_INV_SRCIP) | |
111 | || FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, | |
112 | IPT_INV_DSTIP)) { | |
113 | dprintf("Source or dest mismatch.\n"); | |
114 | ||
cffee385 HH |
115 | dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n", |
116 | &ip->saddr, &ipinfo->smsk.s_addr, &ipinfo->src.s_addr, | |
1da177e4 | 117 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); |
cffee385 HH |
118 | dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n", |
119 | &ip->daddr, &ipinfo->dmsk.s_addr, &ipinfo->dst.s_addr, | |
1da177e4 | 120 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); |
9c547959 | 121 | return false; |
1da177e4 LT |
122 | } |
123 | ||
08361aa8 | 124 | ret = ifname_compare(indev, ipinfo->iniface, ipinfo->iniface_mask); |
1da177e4 LT |
125 | |
126 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { | |
127 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
128 | indev, ipinfo->iniface, | |
129 | ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":""); | |
9c547959 | 130 | return false; |
1da177e4 LT |
131 | } |
132 | ||
08361aa8 | 133 | ret = ifname_compare(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
1da177e4 LT |
134 | |
135 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { | |
136 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
137 | outdev, ipinfo->outiface, | |
138 | ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":""); | |
9c547959 | 139 | return false; |
1da177e4 LT |
140 | } |
141 | ||
142 | /* Check specific protocol */ | |
143 | if (ipinfo->proto | |
144 | && FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { | |
145 | dprintf("Packet protocol %hi does not match %hi.%s\n", | |
146 | ip->protocol, ipinfo->proto, | |
147 | ipinfo->invflags&IPT_INV_PROTO ? " (INV)":""); | |
9c547959 | 148 | return false; |
1da177e4 LT |
149 | } |
150 | ||
151 | /* If we have a fragment rule but the packet is not a fragment | |
152 | * then we return zero */ | |
153 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { | |
154 | dprintf("Fragment rule but not fragment.%s\n", | |
155 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); | |
9c547959 | 156 | return false; |
1da177e4 LT |
157 | } |
158 | ||
9c547959 | 159 | return true; |
1da177e4 LT |
160 | } |
161 | ||
022748a9 | 162 | static bool |
1da177e4 LT |
163 | ip_checkentry(const struct ipt_ip *ip) |
164 | { | |
165 | if (ip->flags & ~IPT_F_MASK) { | |
166 | duprintf("Unknown flag bits set: %08X\n", | |
167 | ip->flags & ~IPT_F_MASK); | |
ccb79bdc | 168 | return false; |
1da177e4 LT |
169 | } |
170 | if (ip->invflags & ~IPT_INV_MASK) { | |
171 | duprintf("Unknown invflag bits set: %08X\n", | |
172 | ip->invflags & ~IPT_INV_MASK); | |
ccb79bdc | 173 | return false; |
1da177e4 | 174 | } |
ccb79bdc | 175 | return true; |
1da177e4 LT |
176 | } |
177 | ||
178 | static unsigned int | |
7eb35586 | 179 | ipt_error(struct sk_buff *skb, const struct xt_target_param *par) |
1da177e4 LT |
180 | { |
181 | if (net_ratelimit()) | |
7eb35586 JE |
182 | printk("ip_tables: error: `%s'\n", |
183 | (const char *)par->targinfo); | |
1da177e4 LT |
184 | |
185 | return NF_DROP; | |
186 | } | |
187 | ||
022748a9 DV |
188 | /* Performance critical - called for every packet */ |
189 | static inline bool | |
f7108a20 JE |
190 | do_match(struct ipt_entry_match *m, const struct sk_buff *skb, |
191 | struct xt_match_param *par) | |
1da177e4 | 192 | { |
f7108a20 JE |
193 | par->match = m->u.kernel.match; |
194 | par->matchinfo = m->data; | |
195 | ||
1da177e4 | 196 | /* Stop iteration if it doesn't match */ |
f7108a20 | 197 | if (!m->u.kernel.match->match(skb, par)) |
1d93a9cb | 198 | return true; |
1da177e4 | 199 | else |
1d93a9cb | 200 | return false; |
1da177e4 LT |
201 | } |
202 | ||
022748a9 | 203 | /* Performance critical */ |
1da177e4 LT |
204 | static inline struct ipt_entry * |
205 | get_entry(void *base, unsigned int offset) | |
206 | { | |
207 | return (struct ipt_entry *)(base + offset); | |
208 | } | |
209 | ||
ba9dda3a | 210 | /* All zeroes == unconditional rule. */ |
022748a9 | 211 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
212 | static inline int |
213 | unconditional(const struct ipt_ip *ip) | |
214 | { | |
215 | unsigned int i; | |
216 | ||
217 | for (i = 0; i < sizeof(*ip)/sizeof(__u32); i++) | |
218 | if (((__u32 *)ip)[i]) | |
219 | return 0; | |
220 | ||
221 | return 1; | |
e79ec50b | 222 | #undef FWINV |
ba9dda3a JK |
223 | } |
224 | ||
225 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
226 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
022748a9 | 227 | static const char *const hooknames[] = { |
6e23ae2a PM |
228 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
229 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 230 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
231 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
232 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
233 | }; |
234 | ||
235 | enum nf_ip_trace_comments { | |
236 | NF_IP_TRACE_COMMENT_RULE, | |
237 | NF_IP_TRACE_COMMENT_RETURN, | |
238 | NF_IP_TRACE_COMMENT_POLICY, | |
239 | }; | |
240 | ||
022748a9 | 241 | static const char *const comments[] = { |
ba9dda3a JK |
242 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
243 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
244 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
245 | }; | |
246 | ||
247 | static struct nf_loginfo trace_loginfo = { | |
248 | .type = NF_LOG_TYPE_LOG, | |
249 | .u = { | |
250 | .log = { | |
251 | .level = 4, | |
252 | .logflags = NF_LOG_MASK, | |
253 | }, | |
254 | }, | |
255 | }; | |
256 | ||
022748a9 | 257 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
258 | static inline int |
259 | get_chainname_rulenum(struct ipt_entry *s, struct ipt_entry *e, | |
260 | char *hookname, char **chainname, | |
261 | char **comment, unsigned int *rulenum) | |
262 | { | |
263 | struct ipt_standard_target *t = (void *)ipt_get_target(s); | |
264 | ||
265 | if (strcmp(t->target.u.kernel.target->name, IPT_ERROR_TARGET) == 0) { | |
266 | /* Head of user chain: ERROR target with chainname */ | |
267 | *chainname = t->target.data; | |
268 | (*rulenum) = 0; | |
269 | } else if (s == e) { | |
270 | (*rulenum)++; | |
271 | ||
272 | if (s->target_offset == sizeof(struct ipt_entry) | |
273 | && strcmp(t->target.u.kernel.target->name, | |
274 | IPT_STANDARD_TARGET) == 0 | |
275 | && t->verdict < 0 | |
276 | && unconditional(&s->ip)) { | |
277 | /* Tail of chains: STANDARD target (return/policy) */ | |
278 | *comment = *chainname == hookname | |
279 | ? (char *)comments[NF_IP_TRACE_COMMENT_POLICY] | |
280 | : (char *)comments[NF_IP_TRACE_COMMENT_RETURN]; | |
281 | } | |
282 | return 1; | |
283 | } else | |
284 | (*rulenum)++; | |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
289 | static void trace_packet(struct sk_buff *skb, | |
290 | unsigned int hook, | |
291 | const struct net_device *in, | |
292 | const struct net_device *out, | |
ecb6f85e | 293 | const char *tablename, |
ba9dda3a JK |
294 | struct xt_table_info *private, |
295 | struct ipt_entry *e) | |
296 | { | |
297 | void *table_base; | |
5452e425 | 298 | const struct ipt_entry *root; |
ba9dda3a JK |
299 | char *hookname, *chainname, *comment; |
300 | unsigned int rulenum = 0; | |
301 | ||
302 | table_base = (void *)private->entries[smp_processor_id()]; | |
303 | root = get_entry(table_base, private->hook_entry[hook]); | |
304 | ||
305 | hookname = chainname = (char *)hooknames[hook]; | |
306 | comment = (char *)comments[NF_IP_TRACE_COMMENT_RULE]; | |
307 | ||
308 | IPT_ENTRY_ITERATE(root, | |
309 | private->size - private->hook_entry[hook], | |
310 | get_chainname_rulenum, | |
311 | e, hookname, &chainname, &comment, &rulenum); | |
312 | ||
313 | nf_log_packet(AF_INET, hook, skb, in, out, &trace_loginfo, | |
314 | "TRACE: %s:%s:%s:%u ", | |
315 | tablename, chainname, comment, rulenum); | |
316 | } | |
317 | #endif | |
318 | ||
1da177e4 LT |
319 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
320 | unsigned int | |
3db05fea | 321 | ipt_do_table(struct sk_buff *skb, |
1da177e4 LT |
322 | unsigned int hook, |
323 | const struct net_device *in, | |
324 | const struct net_device *out, | |
e60a13e0 | 325 | struct xt_table *table) |
1da177e4 LT |
326 | { |
327 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); | |
5452e425 | 328 | const struct iphdr *ip; |
1da177e4 | 329 | u_int16_t datalen; |
cff533ac | 330 | bool hotdrop = false; |
1da177e4 LT |
331 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
332 | unsigned int verdict = NF_DROP; | |
333 | const char *indev, *outdev; | |
334 | void *table_base; | |
335 | struct ipt_entry *e, *back; | |
8311731a | 336 | struct xt_table_info *private; |
f7108a20 | 337 | struct xt_match_param mtpar; |
7eb35586 | 338 | struct xt_target_param tgpar; |
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. */ | |
f7108a20 JE |
351 | mtpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
352 | mtpar.thoff = ip_hdrlen(skb); | |
353 | mtpar.hotdrop = &hotdrop; | |
7eb35586 JE |
354 | mtpar.in = tgpar.in = in; |
355 | mtpar.out = tgpar.out = out; | |
916a917d | 356 | mtpar.family = tgpar.family = NFPROTO_IPV4; |
7eb35586 | 357 | tgpar.hooknum = hook; |
1da177e4 | 358 | |
1da177e4 | 359 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
78454473 SH |
360 | |
361 | rcu_read_lock(); | |
362 | private = rcu_dereference(table->private); | |
363 | table_base = rcu_dereference(private->entries[smp_processor_id()]); | |
364 | ||
2e4e6a17 | 365 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 LT |
366 | |
367 | /* For return from builtin chain */ | |
2e4e6a17 | 368 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
369 | |
370 | do { | |
371 | IP_NF_ASSERT(e); | |
372 | IP_NF_ASSERT(back); | |
f7108a20 JE |
373 | if (ip_packet_match(ip, indev, outdev, |
374 | &e->ip, mtpar.fragoff)) { | |
1da177e4 LT |
375 | struct ipt_entry_target *t; |
376 | ||
f7108a20 | 377 | if (IPT_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) |
1da177e4 LT |
378 | goto no_match; |
379 | ||
380 | ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1); | |
381 | ||
382 | t = ipt_get_target(e); | |
383 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
384 | |
385 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
386 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
387 | /* The packet is traced: log it */ | |
3db05fea HX |
388 | if (unlikely(skb->nf_trace)) |
389 | trace_packet(skb, hook, in, out, | |
ba9dda3a JK |
390 | table->name, private, e); |
391 | #endif | |
1da177e4 LT |
392 | /* Standard target? */ |
393 | if (!t->u.kernel.target->target) { | |
394 | int v; | |
395 | ||
396 | v = ((struct ipt_standard_target *)t)->verdict; | |
397 | if (v < 0) { | |
398 | /* Pop from stack? */ | |
399 | if (v != IPT_RETURN) { | |
400 | verdict = (unsigned)(-v) - 1; | |
401 | break; | |
402 | } | |
403 | e = back; | |
404 | back = get_entry(table_base, | |
405 | back->comefrom); | |
406 | continue; | |
407 | } | |
05465343 PM |
408 | if (table_base + v != (void *)e + e->next_offset |
409 | && !(e->ip.flags & IPT_F_GOTO)) { | |
1da177e4 LT |
410 | /* Save old back ptr in next entry */ |
411 | struct ipt_entry *next | |
412 | = (void *)e + e->next_offset; | |
413 | next->comefrom | |
414 | = (void *)back - table_base; | |
415 | /* set back pointer to next entry */ | |
416 | back = next; | |
417 | } | |
418 | ||
419 | e = get_entry(table_base, v); | |
420 | } else { | |
421 | /* Targets which reenter must return | |
e905a9ed | 422 | abs. verdicts */ |
7eb35586 JE |
423 | tgpar.target = t->u.kernel.target; |
424 | tgpar.targinfo = t->data; | |
1da177e4 LT |
425 | #ifdef CONFIG_NETFILTER_DEBUG |
426 | ((struct ipt_entry *)table_base)->comefrom | |
427 | = 0xeeeeeeec; | |
428 | #endif | |
3db05fea | 429 | verdict = t->u.kernel.target->target(skb, |
7eb35586 | 430 | &tgpar); |
1da177e4 LT |
431 | #ifdef CONFIG_NETFILTER_DEBUG |
432 | if (((struct ipt_entry *)table_base)->comefrom | |
433 | != 0xeeeeeeec | |
434 | && verdict == IPT_CONTINUE) { | |
435 | printk("Target %s reentered!\n", | |
436 | t->u.kernel.target->name); | |
437 | verdict = NF_DROP; | |
438 | } | |
439 | ((struct ipt_entry *)table_base)->comefrom | |
440 | = 0x57acc001; | |
441 | #endif | |
442 | /* Target might have changed stuff. */ | |
3db05fea HX |
443 | ip = ip_hdr(skb); |
444 | datalen = skb->len - ip->ihl * 4; | |
1da177e4 LT |
445 | |
446 | if (verdict == IPT_CONTINUE) | |
447 | e = (void *)e + e->next_offset; | |
448 | else | |
449 | /* Verdict */ | |
450 | break; | |
451 | } | |
452 | } else { | |
453 | ||
454 | no_match: | |
455 | e = (void *)e + e->next_offset; | |
456 | } | |
457 | } while (!hotdrop); | |
458 | ||
78454473 | 459 | rcu_read_unlock(); |
1da177e4 LT |
460 | |
461 | #ifdef DEBUG_ALLOW_ALL | |
462 | return NF_ACCEPT; | |
463 | #else | |
464 | if (hotdrop) | |
465 | return NF_DROP; | |
466 | else return verdict; | |
467 | #endif | |
468 | } | |
469 | ||
1da177e4 LT |
470 | /* Figures out from what hook each rule can be called: returns 0 if |
471 | there are loops. Puts hook bitmask in comefrom. */ | |
472 | static int | |
2e4e6a17 | 473 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 474 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
475 | { |
476 | unsigned int hook; | |
477 | ||
478 | /* No recursion; use packet counter to save back ptrs (reset | |
479 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 480 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 481 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 482 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
483 | |
484 | if (!(valid_hooks & (1 << hook))) | |
485 | continue; | |
486 | ||
487 | /* Set initial back pointer. */ | |
488 | e->counters.pcnt = pos; | |
489 | ||
490 | for (;;) { | |
491 | struct ipt_standard_target *t | |
492 | = (void *)ipt_get_target(e); | |
e1b4b9f3 | 493 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 494 | |
6e23ae2a | 495 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
496 | printk("iptables: loop hook %u pos %u %08X.\n", |
497 | hook, pos, e->comefrom); | |
498 | return 0; | |
499 | } | |
9c547959 | 500 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
501 | |
502 | /* Unconditional return/END. */ | |
e1b4b9f3 | 503 | if ((e->target_offset == sizeof(struct ipt_entry) |
1da177e4 LT |
504 | && (strcmp(t->target.u.user.name, |
505 | IPT_STANDARD_TARGET) == 0) | |
506 | && t->verdict < 0 | |
e1b4b9f3 | 507 | && unconditional(&e->ip)) || visited) { |
1da177e4 LT |
508 | unsigned int oldpos, size; |
509 | ||
74c9c0c1 DM |
510 | if (t->verdict < -NF_MAX_VERDICT - 1) { |
511 | duprintf("mark_source_chains: bad " | |
512 | "negative verdict (%i)\n", | |
513 | t->verdict); | |
514 | return 0; | |
515 | } | |
516 | ||
1da177e4 LT |
517 | /* Return: backtrack through the last |
518 | big jump. */ | |
519 | do { | |
6e23ae2a | 520 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
521 | #ifdef DEBUG_IP_FIREWALL_USER |
522 | if (e->comefrom | |
6e23ae2a | 523 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
524 | duprintf("Back unset " |
525 | "on hook %u " | |
526 | "rule %u\n", | |
527 | hook, pos); | |
528 | } | |
529 | #endif | |
530 | oldpos = pos; | |
531 | pos = e->counters.pcnt; | |
532 | e->counters.pcnt = 0; | |
533 | ||
534 | /* We're at the start. */ | |
535 | if (pos == oldpos) | |
536 | goto next; | |
537 | ||
538 | e = (struct ipt_entry *) | |
31836064 | 539 | (entry0 + pos); |
1da177e4 LT |
540 | } while (oldpos == pos + e->next_offset); |
541 | ||
542 | /* Move along one */ | |
543 | size = e->next_offset; | |
544 | e = (struct ipt_entry *) | |
31836064 | 545 | (entry0 + pos + size); |
1da177e4 LT |
546 | e->counters.pcnt = pos; |
547 | pos += size; | |
548 | } else { | |
549 | int newpos = t->verdict; | |
550 | ||
551 | if (strcmp(t->target.u.user.name, | |
552 | IPT_STANDARD_TARGET) == 0 | |
553 | && newpos >= 0) { | |
74c9c0c1 DM |
554 | if (newpos > newinfo->size - |
555 | sizeof(struct ipt_entry)) { | |
556 | duprintf("mark_source_chains: " | |
557 | "bad verdict (%i)\n", | |
558 | newpos); | |
559 | return 0; | |
560 | } | |
1da177e4 LT |
561 | /* This a jump; chase it. */ |
562 | duprintf("Jump rule %u -> %u\n", | |
563 | pos, newpos); | |
564 | } else { | |
565 | /* ... this is a fallthru */ | |
566 | newpos = pos + e->next_offset; | |
567 | } | |
568 | e = (struct ipt_entry *) | |
31836064 | 569 | (entry0 + newpos); |
1da177e4 LT |
570 | e->counters.pcnt = pos; |
571 | pos = newpos; | |
572 | } | |
573 | } | |
574 | next: | |
575 | duprintf("Finished chain %u\n", hook); | |
576 | } | |
577 | return 1; | |
578 | } | |
579 | ||
022748a9 | 580 | static int |
1da177e4 LT |
581 | cleanup_match(struct ipt_entry_match *m, unsigned int *i) |
582 | { | |
6be3d859 JE |
583 | struct xt_mtdtor_param par; |
584 | ||
1da177e4 LT |
585 | if (i && (*i)-- == 0) |
586 | return 1; | |
587 | ||
6be3d859 JE |
588 | par.match = m->u.kernel.match; |
589 | par.matchinfo = m->data; | |
916a917d | 590 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
591 | if (par.match->destroy != NULL) |
592 | par.match->destroy(&par); | |
593 | module_put(par.match->me); | |
1da177e4 LT |
594 | return 0; |
595 | } | |
596 | ||
022748a9 | 597 | static int |
a96be246 DM |
598 | check_entry(struct ipt_entry *e, const char *name) |
599 | { | |
600 | struct ipt_entry_target *t; | |
601 | ||
602 | if (!ip_checkentry(&e->ip)) { | |
603 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
604 | return -EINVAL; | |
605 | } | |
606 | ||
9c547959 PM |
607 | if (e->target_offset + sizeof(struct ipt_entry_target) > |
608 | e->next_offset) | |
a96be246 DM |
609 | return -EINVAL; |
610 | ||
611 | t = ipt_get_target(e); | |
612 | if (e->target_offset + t->u.target_size > e->next_offset) | |
613 | return -EINVAL; | |
614 | ||
615 | return 0; | |
616 | } | |
617 | ||
022748a9 | 618 | static int |
9b4fce7a JE |
619 | check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par, |
620 | unsigned int *i) | |
a96be246 | 621 | { |
9b4fce7a | 622 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 DM |
623 | int ret; |
624 | ||
9b4fce7a JE |
625 | par->match = m->u.kernel.match; |
626 | par->matchinfo = m->data; | |
627 | ||
916a917d | 628 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 629 | ip->proto, ip->invflags & IPT_INV_PROTO); |
367c6790 | 630 | if (ret < 0) { |
a96be246 | 631 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 632 | par.match->name); |
367c6790 | 633 | return ret; |
a96be246 | 634 | } |
367c6790 JE |
635 | ++*i; |
636 | return 0; | |
a96be246 DM |
637 | } |
638 | ||
022748a9 | 639 | static int |
9b4fce7a | 640 | find_check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par, |
4b478248 | 641 | unsigned int *i) |
1da177e4 | 642 | { |
6709dbbb | 643 | struct xt_match *match; |
3cdc7c95 | 644 | int ret; |
1da177e4 | 645 | |
2e4e6a17 | 646 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, |
9c547959 | 647 | m->u.user.revision), |
1da177e4 LT |
648 | "ipt_%s", m->u.user.name); |
649 | if (IS_ERR(match) || !match) { | |
a96be246 | 650 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
1da177e4 LT |
651 | return match ? PTR_ERR(match) : -ENOENT; |
652 | } | |
653 | m->u.kernel.match = match; | |
654 | ||
9b4fce7a | 655 | ret = check_match(m, par, i); |
3cdc7c95 PM |
656 | if (ret) |
657 | goto err; | |
658 | ||
1da177e4 | 659 | return 0; |
3cdc7c95 PM |
660 | err: |
661 | module_put(m->u.kernel.match->me); | |
662 | return ret; | |
1da177e4 LT |
663 | } |
664 | ||
022748a9 | 665 | static int check_target(struct ipt_entry *e, const char *name) |
a96be246 | 666 | { |
af5d6dc2 JE |
667 | struct ipt_entry_target *t = ipt_get_target(e); |
668 | struct xt_tgchk_param par = { | |
669 | .table = name, | |
670 | .entryinfo = e, | |
671 | .target = t->u.kernel.target, | |
672 | .targinfo = t->data, | |
673 | .hook_mask = e->comefrom, | |
916a917d | 674 | .family = NFPROTO_IPV4, |
af5d6dc2 | 675 | }; |
e905a9ed | 676 | int ret; |
a96be246 | 677 | |
916a917d | 678 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 679 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
367c6790 | 680 | if (ret < 0) { |
a96be246 DM |
681 | duprintf("ip_tables: check failed for `%s'.\n", |
682 | t->u.kernel.target->name); | |
367c6790 | 683 | return ret; |
a96be246 | 684 | } |
367c6790 | 685 | return 0; |
a96be246 | 686 | } |
1da177e4 | 687 | |
022748a9 | 688 | static int |
a96be246 | 689 | find_check_entry(struct ipt_entry *e, const char *name, unsigned int size, |
4b478248 | 690 | unsigned int *i) |
1da177e4 LT |
691 | { |
692 | struct ipt_entry_target *t; | |
6709dbbb | 693 | struct xt_target *target; |
1da177e4 LT |
694 | int ret; |
695 | unsigned int j; | |
9b4fce7a | 696 | struct xt_mtchk_param mtpar; |
1da177e4 | 697 | |
a96be246 DM |
698 | ret = check_entry(e, name); |
699 | if (ret) | |
700 | return ret; | |
590bdf7f | 701 | |
1da177e4 | 702 | j = 0; |
9b4fce7a JE |
703 | mtpar.table = name; |
704 | mtpar.entryinfo = &e->ip; | |
705 | mtpar.hook_mask = e->comefrom; | |
916a917d | 706 | mtpar.family = NFPROTO_IPV4; |
9b4fce7a | 707 | ret = IPT_MATCH_ITERATE(e, find_check_match, &mtpar, &j); |
1da177e4 LT |
708 | if (ret != 0) |
709 | goto cleanup_matches; | |
710 | ||
711 | t = ipt_get_target(e); | |
2e4e6a17 | 712 | target = try_then_request_module(xt_find_target(AF_INET, |
4b478248 PM |
713 | t->u.user.name, |
714 | t->u.user.revision), | |
1da177e4 LT |
715 | "ipt_%s", t->u.user.name); |
716 | if (IS_ERR(target) || !target) { | |
a96be246 | 717 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
1da177e4 LT |
718 | ret = target ? PTR_ERR(target) : -ENOENT; |
719 | goto cleanup_matches; | |
720 | } | |
721 | t->u.kernel.target = target; | |
722 | ||
a96be246 | 723 | ret = check_target(e, name); |
3cdc7c95 PM |
724 | if (ret) |
725 | goto err; | |
726 | ||
1da177e4 LT |
727 | (*i)++; |
728 | return 0; | |
3cdc7c95 PM |
729 | err: |
730 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
731 | cleanup_matches: |
732 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
733 | return ret; | |
734 | } | |
735 | ||
022748a9 | 736 | static int |
1da177e4 | 737 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 738 | struct xt_table_info *newinfo, |
1da177e4 LT |
739 | unsigned char *base, |
740 | unsigned char *limit, | |
741 | const unsigned int *hook_entries, | |
742 | const unsigned int *underflows, | |
743 | unsigned int *i) | |
744 | { | |
745 | unsigned int h; | |
746 | ||
747 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 | |
748 | || (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { | |
749 | duprintf("Bad offset %p\n", e); | |
750 | return -EINVAL; | |
751 | } | |
752 | ||
753 | if (e->next_offset | |
754 | < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) { | |
755 | duprintf("checking: element %p size %u\n", | |
756 | e, e->next_offset); | |
757 | return -EINVAL; | |
758 | } | |
759 | ||
760 | /* Check hooks & underflows */ | |
6e23ae2a | 761 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
1da177e4 LT |
762 | if ((unsigned char *)e - base == hook_entries[h]) |
763 | newinfo->hook_entry[h] = hook_entries[h]; | |
764 | if ((unsigned char *)e - base == underflows[h]) | |
765 | newinfo->underflow[h] = underflows[h]; | |
766 | } | |
767 | ||
768 | /* FIXME: underflows must be unconditional, standard verdicts | |
e905a9ed | 769 | < 0 (not IPT_RETURN). --RR */ |
1da177e4 LT |
770 | |
771 | /* Clear counters and comefrom */ | |
2e4e6a17 | 772 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
773 | e->comefrom = 0; |
774 | ||
775 | (*i)++; | |
776 | return 0; | |
777 | } | |
778 | ||
022748a9 | 779 | static int |
1da177e4 LT |
780 | cleanup_entry(struct ipt_entry *e, unsigned int *i) |
781 | { | |
a2df1648 | 782 | struct xt_tgdtor_param par; |
1da177e4 LT |
783 | struct ipt_entry_target *t; |
784 | ||
785 | if (i && (*i)-- == 0) | |
786 | return 1; | |
787 | ||
788 | /* Cleanup all matches */ | |
789 | IPT_MATCH_ITERATE(e, cleanup_match, NULL); | |
790 | t = ipt_get_target(e); | |
a2df1648 JE |
791 | |
792 | par.target = t->u.kernel.target; | |
793 | par.targinfo = t->data; | |
916a917d | 794 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
795 | if (par.target->destroy != NULL) |
796 | par.target->destroy(&par); | |
797 | module_put(par.target->me); | |
1da177e4 LT |
798 | return 0; |
799 | } | |
800 | ||
801 | /* Checks and translates the user-supplied table segment (held in | |
802 | newinfo) */ | |
803 | static int | |
804 | translate_table(const char *name, | |
805 | unsigned int valid_hooks, | |
2e4e6a17 | 806 | struct xt_table_info *newinfo, |
31836064 | 807 | void *entry0, |
1da177e4 LT |
808 | unsigned int size, |
809 | unsigned int number, | |
810 | const unsigned int *hook_entries, | |
811 | const unsigned int *underflows) | |
812 | { | |
813 | unsigned int i; | |
814 | int ret; | |
815 | ||
816 | newinfo->size = size; | |
817 | newinfo->number = number; | |
818 | ||
819 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 820 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
821 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
822 | newinfo->underflow[i] = 0xFFFFFFFF; | |
823 | } | |
824 | ||
825 | duprintf("translate_table: size %u\n", newinfo->size); | |
826 | i = 0; | |
827 | /* Walk through entries, checking offsets. */ | |
31836064 | 828 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
829 | check_entry_size_and_hooks, |
830 | newinfo, | |
31836064 ED |
831 | entry0, |
832 | entry0 + size, | |
1da177e4 LT |
833 | hook_entries, underflows, &i); |
834 | if (ret != 0) | |
835 | return ret; | |
836 | ||
837 | if (i != number) { | |
838 | duprintf("translate_table: %u not %u entries\n", | |
839 | i, number); | |
840 | return -EINVAL; | |
841 | } | |
842 | ||
843 | /* Check hooks all assigned */ | |
6e23ae2a | 844 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
845 | /* Only hooks which are valid */ |
846 | if (!(valid_hooks & (1 << i))) | |
847 | continue; | |
848 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
849 | duprintf("Invalid hook entry %u %u\n", | |
850 | i, hook_entries[i]); | |
851 | return -EINVAL; | |
852 | } | |
853 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
854 | duprintf("Invalid underflow %u %u\n", | |
855 | i, underflows[i]); | |
856 | return -EINVAL; | |
857 | } | |
858 | } | |
859 | ||
74c9c0c1 DM |
860 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
861 | return -ELOOP; | |
862 | ||
1da177e4 LT |
863 | /* Finally, each sanity check must pass */ |
864 | i = 0; | |
31836064 | 865 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
a96be246 | 866 | find_check_entry, name, size, &i); |
1da177e4 | 867 | |
74c9c0c1 DM |
868 | if (ret != 0) { |
869 | IPT_ENTRY_ITERATE(entry0, newinfo->size, | |
870 | cleanup_entry, &i); | |
871 | return ret; | |
872 | } | |
1da177e4 LT |
873 | |
874 | /* And one copy for every other CPU */ | |
6f912042 | 875 | for_each_possible_cpu(i) { |
31836064 ED |
876 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
877 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
878 | } |
879 | ||
880 | return ret; | |
881 | } | |
882 | ||
1da177e4 LT |
883 | /* Gets counters. */ |
884 | static inline int | |
885 | add_entry_to_counter(const struct ipt_entry *e, | |
2e4e6a17 | 886 | struct xt_counters total[], |
1da177e4 LT |
887 | unsigned int *i) |
888 | { | |
889 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
890 | ||
891 | (*i)++; | |
892 | return 0; | |
893 | } | |
894 | ||
31836064 ED |
895 | static inline int |
896 | set_entry_to_counter(const struct ipt_entry *e, | |
897 | struct ipt_counters total[], | |
898 | unsigned int *i) | |
899 | { | |
900 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
901 | ||
902 | (*i)++; | |
903 | return 0; | |
904 | } | |
905 | ||
1da177e4 | 906 | static void |
2e4e6a17 HW |
907 | get_counters(const struct xt_table_info *t, |
908 | struct xt_counters counters[]) | |
1da177e4 LT |
909 | { |
910 | unsigned int cpu; | |
911 | unsigned int i; | |
31836064 ED |
912 | unsigned int curcpu; |
913 | ||
914 | /* Instead of clearing (by a previous call to memset()) | |
915 | * the counters and using adds, we set the counters | |
916 | * with data used by 'current' CPU | |
917 | * We dont care about preemption here. | |
918 | */ | |
919 | curcpu = raw_smp_processor_id(); | |
920 | ||
921 | i = 0; | |
922 | IPT_ENTRY_ITERATE(t->entries[curcpu], | |
923 | t->size, | |
924 | set_entry_to_counter, | |
925 | counters, | |
926 | &i); | |
1da177e4 | 927 | |
6f912042 | 928 | for_each_possible_cpu(cpu) { |
31836064 ED |
929 | if (cpu == curcpu) |
930 | continue; | |
1da177e4 | 931 | i = 0; |
31836064 | 932 | IPT_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
933 | t->size, |
934 | add_entry_to_counter, | |
935 | counters, | |
936 | &i); | |
937 | } | |
78454473 SH |
938 | |
939 | } | |
940 | ||
941 | /* We're lazy, and add to the first CPU; overflow works its fey magic | |
942 | * and everything is OK. */ | |
943 | static int | |
944 | add_counter_to_entry(struct ipt_entry *e, | |
945 | const struct xt_counters addme[], | |
946 | unsigned int *i) | |
947 | { | |
948 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
949 | ||
950 | (*i)++; | |
951 | return 0; | |
952 | } | |
953 | ||
954 | /* Take values from counters and add them back onto the current cpu */ | |
955 | static void put_counters(struct xt_table_info *t, | |
956 | const struct xt_counters counters[]) | |
957 | { | |
958 | unsigned int i, cpu; | |
959 | ||
960 | local_bh_disable(); | |
961 | cpu = smp_processor_id(); | |
962 | i = 0; | |
963 | IPT_ENTRY_ITERATE(t->entries[cpu], | |
964 | t->size, | |
965 | add_counter_to_entry, | |
966 | counters, | |
967 | &i); | |
968 | local_bh_enable(); | |
969 | } | |
970 | ||
971 | ||
972 | static inline int | |
973 | zero_entry_counter(struct ipt_entry *e, void *arg) | |
974 | { | |
975 | e->counters.bcnt = 0; | |
976 | e->counters.pcnt = 0; | |
977 | return 0; | |
978 | } | |
979 | ||
980 | static void | |
981 | clone_counters(struct xt_table_info *newinfo, const struct xt_table_info *info) | |
982 | { | |
983 | unsigned int cpu; | |
984 | const void *loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
985 | ||
986 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
987 | for_each_possible_cpu(cpu) { | |
988 | memcpy(newinfo->entries[cpu], loc_cpu_entry, info->size); | |
989 | IPT_ENTRY_ITERATE(newinfo->entries[cpu], newinfo->size, | |
990 | zero_entry_counter, NULL); | |
991 | } | |
1da177e4 LT |
992 | } |
993 | ||
022748a9 | 994 | static struct xt_counters * alloc_counters(struct xt_table *table) |
1da177e4 | 995 | { |
2722971c | 996 | unsigned int countersize; |
2e4e6a17 | 997 | struct xt_counters *counters; |
78454473 SH |
998 | struct xt_table_info *private = table->private; |
999 | struct xt_table_info *info; | |
1da177e4 LT |
1000 | |
1001 | /* We need atomic snapshot of counters: rest doesn't change | |
1002 | (other than comefrom, which userspace doesn't care | |
1003 | about). */ | |
2e4e6a17 | 1004 | countersize = sizeof(struct xt_counters) * private->number; |
31836064 | 1005 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
1006 | |
1007 | if (counters == NULL) | |
78454473 SH |
1008 | goto nomem; |
1009 | ||
1010 | info = xt_alloc_table_info(private->size); | |
1011 | if (!info) | |
1012 | goto free_counters; | |
1013 | ||
1014 | clone_counters(info, private); | |
1da177e4 | 1015 | |
78454473 SH |
1016 | mutex_lock(&table->lock); |
1017 | xt_table_entry_swap_rcu(private, info); | |
1018 | synchronize_net(); /* Wait until smoke has cleared */ | |
1019 | ||
1020 | get_counters(info, counters); | |
1021 | put_counters(private, counters); | |
1022 | mutex_unlock(&table->lock); | |
1023 | ||
1024 | xt_free_table_info(info); | |
1da177e4 | 1025 | |
2722971c | 1026 | return counters; |
78454473 SH |
1027 | |
1028 | free_counters: | |
1029 | vfree(counters); | |
1030 | nomem: | |
1031 | return ERR_PTR(-ENOMEM); | |
2722971c DM |
1032 | } |
1033 | ||
1034 | static int | |
1035 | copy_entries_to_user(unsigned int total_size, | |
e60a13e0 | 1036 | struct xt_table *table, |
2722971c DM |
1037 | void __user *userptr) |
1038 | { | |
1039 | unsigned int off, num; | |
1040 | struct ipt_entry *e; | |
1041 | struct xt_counters *counters; | |
5452e425 | 1042 | const struct xt_table_info *private = table->private; |
2722971c | 1043 | int ret = 0; |
5452e425 | 1044 | const void *loc_cpu_entry; |
2722971c DM |
1045 | |
1046 | counters = alloc_counters(table); | |
1047 | if (IS_ERR(counters)) | |
1048 | return PTR_ERR(counters); | |
1049 | ||
31836064 ED |
1050 | /* choose the copy that is on our node/cpu, ... |
1051 | * This choice is lazy (because current thread is | |
1052 | * allowed to migrate to another cpu) | |
1053 | */ | |
2e4e6a17 | 1054 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 1055 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
1056 | ret = -EFAULT; |
1057 | goto free_counters; | |
1058 | } | |
1059 | ||
1060 | /* FIXME: use iterator macros --RR */ | |
1061 | /* ... then go back and fix counters and names */ | |
1062 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
1063 | unsigned int i; | |
5452e425 JE |
1064 | const struct ipt_entry_match *m; |
1065 | const struct ipt_entry_target *t; | |
1da177e4 | 1066 | |
31836064 | 1067 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
1068 | if (copy_to_user(userptr + off |
1069 | + offsetof(struct ipt_entry, counters), | |
1070 | &counters[num], | |
1071 | sizeof(counters[num])) != 0) { | |
1072 | ret = -EFAULT; | |
1073 | goto free_counters; | |
1074 | } | |
1075 | ||
1076 | for (i = sizeof(struct ipt_entry); | |
1077 | i < e->target_offset; | |
1078 | i += m->u.match_size) { | |
1079 | m = (void *)e + i; | |
1080 | ||
1081 | if (copy_to_user(userptr + off + i | |
1082 | + offsetof(struct ipt_entry_match, | |
1083 | u.user.name), | |
1084 | m->u.kernel.match->name, | |
1085 | strlen(m->u.kernel.match->name)+1) | |
1086 | != 0) { | |
1087 | ret = -EFAULT; | |
1088 | goto free_counters; | |
1089 | } | |
1090 | } | |
1091 | ||
1092 | t = ipt_get_target(e); | |
1093 | if (copy_to_user(userptr + off + e->target_offset | |
1094 | + offsetof(struct ipt_entry_target, | |
1095 | u.user.name), | |
1096 | t->u.kernel.target->name, | |
1097 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1098 | ret = -EFAULT; | |
1099 | goto free_counters; | |
1100 | } | |
1101 | } | |
1102 | ||
1103 | free_counters: | |
1104 | vfree(counters); | |
1105 | return ret; | |
1106 | } | |
1107 | ||
2722971c | 1108 | #ifdef CONFIG_COMPAT |
9fa492cd | 1109 | static void compat_standard_from_user(void *dst, void *src) |
2722971c | 1110 | { |
9fa492cd | 1111 | int v = *(compat_int_t *)src; |
2722971c | 1112 | |
9fa492cd | 1113 | if (v > 0) |
b386d9f5 | 1114 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1115 | memcpy(dst, &v, sizeof(v)); |
1116 | } | |
46c5ea3c | 1117 | |
9fa492cd | 1118 | static int compat_standard_to_user(void __user *dst, void *src) |
2722971c | 1119 | { |
9fa492cd | 1120 | compat_int_t cv = *(int *)src; |
2722971c | 1121 | |
9fa492cd | 1122 | if (cv > 0) |
b386d9f5 | 1123 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1124 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1125 | } |
1126 | ||
1127 | static inline int | |
4b478248 | 1128 | compat_calc_match(struct ipt_entry_match *m, int *size) |
2722971c | 1129 | { |
9fa492cd | 1130 | *size += xt_compat_match_offset(m->u.kernel.match); |
2722971c DM |
1131 | return 0; |
1132 | } | |
1133 | ||
259d4e41 | 1134 | static int compat_calc_entry(struct ipt_entry *e, |
4b478248 PM |
1135 | const struct xt_table_info *info, |
1136 | void *base, struct xt_table_info *newinfo) | |
2722971c DM |
1137 | { |
1138 | struct ipt_entry_target *t; | |
e5b5ef7d | 1139 | unsigned int entry_offset; |
2722971c DM |
1140 | int off, i, ret; |
1141 | ||
30c08c41 | 1142 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1143 | entry_offset = (void *)e - base; |
1144 | IPT_MATCH_ITERATE(e, compat_calc_match, &off); | |
1145 | t = ipt_get_target(e); | |
9fa492cd | 1146 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1147 | newinfo->size -= off; |
b386d9f5 | 1148 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1149 | if (ret) |
1150 | return ret; | |
1151 | ||
6e23ae2a | 1152 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1153 | if (info->hook_entry[i] && |
1154 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1155 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1156 | if (info->underflow[i] && |
1157 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1158 | newinfo->underflow[i] -= off; |
1159 | } | |
1160 | return 0; | |
1161 | } | |
1162 | ||
259d4e41 | 1163 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1164 | struct xt_table_info *newinfo) |
2722971c DM |
1165 | { |
1166 | void *loc_cpu_entry; | |
2722971c DM |
1167 | |
1168 | if (!newinfo || !info) | |
1169 | return -EINVAL; | |
1170 | ||
259d4e41 ED |
1171 | /* we dont care about newinfo->entries[] */ |
1172 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1173 | newinfo->initial_entries = 0; | |
2722971c DM |
1174 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
1175 | return IPT_ENTRY_ITERATE(loc_cpu_entry, info->size, | |
4b478248 PM |
1176 | compat_calc_entry, info, loc_cpu_entry, |
1177 | newinfo); | |
2722971c DM |
1178 | } |
1179 | #endif | |
1180 | ||
34bd137b | 1181 | static int get_info(struct net *net, void __user *user, int *len, int compat) |
2722971c DM |
1182 | { |
1183 | char name[IPT_TABLE_MAXNAMELEN]; | |
e60a13e0 | 1184 | struct xt_table *t; |
2722971c DM |
1185 | int ret; |
1186 | ||
1187 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1188 | duprintf("length %u != %zu\n", *len, |
1189 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1190 | return -EINVAL; |
1191 | } | |
1192 | ||
1193 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1194 | return -EFAULT; | |
1195 | ||
1196 | name[IPT_TABLE_MAXNAMELEN-1] = '\0'; | |
1197 | #ifdef CONFIG_COMPAT | |
1198 | if (compat) | |
1199 | xt_compat_lock(AF_INET); | |
1200 | #endif | |
34bd137b | 1201 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1202 | "iptable_%s", name); |
2722971c DM |
1203 | if (t && !IS_ERR(t)) { |
1204 | struct ipt_getinfo info; | |
5452e425 | 1205 | const struct xt_table_info *private = t->private; |
2722971c DM |
1206 | |
1207 | #ifdef CONFIG_COMPAT | |
1208 | if (compat) { | |
1209 | struct xt_table_info tmp; | |
1210 | ret = compat_table_info(private, &tmp); | |
b386d9f5 | 1211 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1212 | private = &tmp; |
2722971c DM |
1213 | } |
1214 | #endif | |
1215 | info.valid_hooks = t->valid_hooks; | |
1216 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1217 | sizeof(info.hook_entry)); |
2722971c | 1218 | memcpy(info.underflow, private->underflow, |
4b478248 | 1219 | sizeof(info.underflow)); |
2722971c DM |
1220 | info.num_entries = private->number; |
1221 | info.size = private->size; | |
1222 | strcpy(info.name, name); | |
1223 | ||
1224 | if (copy_to_user(user, &info, *len) != 0) | |
1225 | ret = -EFAULT; | |
1226 | else | |
1227 | ret = 0; | |
1228 | ||
1229 | xt_table_unlock(t); | |
1230 | module_put(t->me); | |
1231 | } else | |
1232 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1233 | #ifdef CONFIG_COMPAT | |
1234 | if (compat) | |
1235 | xt_compat_unlock(AF_INET); | |
1236 | #endif | |
1237 | return ret; | |
1238 | } | |
1239 | ||
1240 | static int | |
34bd137b | 1241 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, int *len) |
2722971c DM |
1242 | { |
1243 | int ret; | |
1244 | struct ipt_get_entries get; | |
e60a13e0 | 1245 | struct xt_table *t; |
2722971c DM |
1246 | |
1247 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1248 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1249 | return -EINVAL; |
1250 | } | |
1251 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1252 | return -EFAULT; | |
1253 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1254 | duprintf("get_entries: %u != %zu\n", |
1255 | *len, sizeof(get) + get.size); | |
2722971c DM |
1256 | return -EINVAL; |
1257 | } | |
1258 | ||
34bd137b | 1259 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1260 | if (t && !IS_ERR(t)) { |
5452e425 | 1261 | const struct xt_table_info *private = t->private; |
9c547959 | 1262 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1263 | if (get.size == private->size) |
1264 | ret = copy_entries_to_user(private->size, | |
1265 | t, uptr->entrytable); | |
1266 | else { | |
1267 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1268 | private->size, get.size); |
544473c1 | 1269 | ret = -EAGAIN; |
2722971c DM |
1270 | } |
1271 | module_put(t->me); | |
1272 | xt_table_unlock(t); | |
1273 | } else | |
1274 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1275 | ||
1276 | return ret; | |
1277 | } | |
1278 | ||
1279 | static int | |
34bd137b | 1280 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1281 | struct xt_table_info *newinfo, unsigned int num_counters, |
1282 | void __user *counters_ptr) | |
2722971c DM |
1283 | { |
1284 | int ret; | |
e60a13e0 | 1285 | struct xt_table *t; |
2722971c DM |
1286 | struct xt_table_info *oldinfo; |
1287 | struct xt_counters *counters; | |
1288 | void *loc_cpu_old_entry; | |
1289 | ||
1290 | ret = 0; | |
1291 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); | |
1292 | if (!counters) { | |
1293 | ret = -ENOMEM; | |
1294 | goto out; | |
1295 | } | |
1296 | ||
34bd137b | 1297 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c DM |
1298 | "iptable_%s", name); |
1299 | if (!t || IS_ERR(t)) { | |
1300 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1301 | goto free_newinfo_counters_untrans; | |
1302 | } | |
1303 | ||
1304 | /* You lied! */ | |
1305 | if (valid_hooks != t->valid_hooks) { | |
1306 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1307 | valid_hooks, t->valid_hooks); | |
1308 | ret = -EINVAL; | |
1309 | goto put_module; | |
1310 | } | |
1311 | ||
1312 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1313 | if (!oldinfo) | |
1314 | goto put_module; | |
1315 | ||
1316 | /* Update module usage count based on number of rules */ | |
1317 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1318 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1319 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1320 | (newinfo->number <= oldinfo->initial_entries)) | |
1321 | module_put(t->me); | |
1322 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1323 | (newinfo->number <= oldinfo->initial_entries)) | |
1324 | module_put(t->me); | |
1325 | ||
1326 | /* Get the old counters. */ | |
1327 | get_counters(oldinfo, counters); | |
1328 | /* Decrease module usage counts and free resource */ | |
1329 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
4b478248 PM |
1330 | IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry, |
1331 | NULL); | |
2722971c DM |
1332 | xt_free_table_info(oldinfo); |
1333 | if (copy_to_user(counters_ptr, counters, | |
1334 | sizeof(struct xt_counters) * num_counters) != 0) | |
1335 | ret = -EFAULT; | |
1336 | vfree(counters); | |
1337 | xt_table_unlock(t); | |
1338 | return ret; | |
1339 | ||
1340 | put_module: | |
1341 | module_put(t->me); | |
1342 | xt_table_unlock(t); | |
1343 | free_newinfo_counters_untrans: | |
1344 | vfree(counters); | |
1345 | out: | |
1346 | return ret; | |
1347 | } | |
1348 | ||
1349 | static int | |
34bd137b | 1350 | do_replace(struct net *net, void __user *user, unsigned int len) |
2722971c DM |
1351 | { |
1352 | int ret; | |
1353 | struct ipt_replace tmp; | |
1354 | struct xt_table_info *newinfo; | |
1355 | void *loc_cpu_entry; | |
1356 | ||
1357 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1358 | return -EFAULT; | |
1359 | ||
2722971c | 1360 | /* overflow check */ |
2722971c DM |
1361 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1362 | return -ENOMEM; | |
1363 | ||
1364 | newinfo = xt_alloc_table_info(tmp.size); | |
1365 | if (!newinfo) | |
1366 | return -ENOMEM; | |
1367 | ||
9c547959 | 1368 | /* choose the copy that is on our node/cpu */ |
2722971c DM |
1369 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1370 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1371 | tmp.size) != 0) { | |
1372 | ret = -EFAULT; | |
1373 | goto free_newinfo; | |
1374 | } | |
1375 | ||
1376 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
1377 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, | |
1378 | tmp.hook_entry, tmp.underflow); | |
1379 | if (ret != 0) | |
1380 | goto free_newinfo; | |
1381 | ||
1382 | duprintf("ip_tables: Translated table\n"); | |
1383 | ||
34bd137b | 1384 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1385 | tmp.num_counters, tmp.counters); |
2722971c DM |
1386 | if (ret) |
1387 | goto free_newinfo_untrans; | |
1388 | return 0; | |
1389 | ||
1390 | free_newinfo_untrans: | |
9c547959 | 1391 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
2722971c DM |
1392 | free_newinfo: |
1393 | xt_free_table_info(newinfo); | |
1394 | return ret; | |
1395 | } | |
1396 | ||
2722971c DM |
1397 | |
1398 | static int | |
34bd137b | 1399 | do_add_counters(struct net *net, void __user *user, unsigned int len, int compat) |
2722971c DM |
1400 | { |
1401 | unsigned int i; | |
1402 | struct xt_counters_info tmp; | |
1403 | struct xt_counters *paddc; | |
1404 | unsigned int num_counters; | |
5452e425 | 1405 | const char *name; |
2722971c DM |
1406 | int size; |
1407 | void *ptmp; | |
e60a13e0 | 1408 | struct xt_table *t; |
5452e425 | 1409 | const struct xt_table_info *private; |
2722971c DM |
1410 | int ret = 0; |
1411 | void *loc_cpu_entry; | |
1412 | #ifdef CONFIG_COMPAT | |
1413 | struct compat_xt_counters_info compat_tmp; | |
1414 | ||
1415 | if (compat) { | |
1416 | ptmp = &compat_tmp; | |
1417 | size = sizeof(struct compat_xt_counters_info); | |
1418 | } else | |
1419 | #endif | |
1420 | { | |
1421 | ptmp = &tmp; | |
1422 | size = sizeof(struct xt_counters_info); | |
1423 | } | |
1424 | ||
1425 | if (copy_from_user(ptmp, user, size) != 0) | |
1426 | return -EFAULT; | |
1427 | ||
1428 | #ifdef CONFIG_COMPAT | |
1429 | if (compat) { | |
1430 | num_counters = compat_tmp.num_counters; | |
1431 | name = compat_tmp.name; | |
1432 | } else | |
1433 | #endif | |
1434 | { | |
1435 | num_counters = tmp.num_counters; | |
1436 | name = tmp.name; | |
1437 | } | |
1438 | ||
1439 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1440 | return -EINVAL; | |
1441 | ||
1442 | paddc = vmalloc_node(len - size, numa_node_id()); | |
1443 | if (!paddc) | |
1444 | return -ENOMEM; | |
1445 | ||
1446 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1447 | ret = -EFAULT; | |
1448 | goto free; | |
1449 | } | |
1450 | ||
34bd137b | 1451 | t = xt_find_table_lock(net, AF_INET, name); |
2722971c DM |
1452 | if (!t || IS_ERR(t)) { |
1453 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1454 | goto free; | |
1455 | } | |
1456 | ||
78454473 | 1457 | mutex_lock(&t->lock); |
2722971c DM |
1458 | private = t->private; |
1459 | if (private->number != num_counters) { | |
1460 | ret = -EINVAL; | |
1461 | goto unlock_up_free; | |
1462 | } | |
1463 | ||
78454473 | 1464 | preempt_disable(); |
2722971c DM |
1465 | i = 0; |
1466 | /* Choose the copy that is on our node */ | |
1467 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1468 | IPT_ENTRY_ITERATE(loc_cpu_entry, | |
1469 | private->size, | |
1470 | add_counter_to_entry, | |
1471 | paddc, | |
1472 | &i); | |
78454473 | 1473 | preempt_enable(); |
2722971c | 1474 | unlock_up_free: |
78454473 | 1475 | mutex_unlock(&t->lock); |
2722971c DM |
1476 | xt_table_unlock(t); |
1477 | module_put(t->me); | |
1478 | free: | |
1479 | vfree(paddc); | |
1480 | ||
1481 | return ret; | |
1482 | } | |
1483 | ||
1484 | #ifdef CONFIG_COMPAT | |
1485 | struct compat_ipt_replace { | |
1486 | char name[IPT_TABLE_MAXNAMELEN]; | |
1487 | u32 valid_hooks; | |
1488 | u32 num_entries; | |
1489 | u32 size; | |
6e23ae2a PM |
1490 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1491 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c DM |
1492 | u32 num_counters; |
1493 | compat_uptr_t counters; /* struct ipt_counters * */ | |
1494 | struct compat_ipt_entry entries[0]; | |
1495 | }; | |
1496 | ||
a18aa31b PM |
1497 | static int |
1498 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1499 | unsigned int *size, struct xt_counters *counters, |
a18aa31b | 1500 | unsigned int *i) |
2722971c | 1501 | { |
3e597c60 | 1502 | struct ipt_entry_target *t; |
2722971c DM |
1503 | struct compat_ipt_entry __user *ce; |
1504 | u_int16_t target_offset, next_offset; | |
1505 | compat_uint_t origsize; | |
1506 | int ret; | |
1507 | ||
1508 | ret = -EFAULT; | |
1509 | origsize = *size; | |
1510 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
7800007c | 1511 | if (copy_to_user(ce, e, sizeof(struct ipt_entry))) |
2722971c DM |
1512 | goto out; |
1513 | ||
a18aa31b PM |
1514 | if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i]))) |
1515 | goto out; | |
1516 | ||
2722971c | 1517 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1518 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1519 | ||
ac8e27fd | 1520 | ret = IPT_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size); |
2722971c DM |
1521 | target_offset = e->target_offset - (origsize - *size); |
1522 | if (ret) | |
1523 | goto out; | |
1524 | t = ipt_get_target(e); | |
9fa492cd | 1525 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c DM |
1526 | if (ret) |
1527 | goto out; | |
1528 | ret = -EFAULT; | |
1529 | next_offset = e->next_offset - (origsize - *size); | |
7800007c | 1530 | if (put_user(target_offset, &ce->target_offset)) |
2722971c | 1531 | goto out; |
7800007c | 1532 | if (put_user(next_offset, &ce->next_offset)) |
2722971c | 1533 | goto out; |
a18aa31b PM |
1534 | |
1535 | (*i)++; | |
2722971c DM |
1536 | return 0; |
1537 | out: | |
1538 | return ret; | |
1539 | } | |
1540 | ||
022748a9 | 1541 | static int |
4c1b52bc | 1542 | compat_find_calc_match(struct ipt_entry_match *m, |
4b478248 PM |
1543 | const char *name, |
1544 | const struct ipt_ip *ip, | |
1545 | unsigned int hookmask, | |
b0a6363c | 1546 | int *size, unsigned int *i) |
2722971c | 1547 | { |
6709dbbb | 1548 | struct xt_match *match; |
2722971c DM |
1549 | |
1550 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, | |
4b478248 | 1551 | m->u.user.revision), |
2722971c DM |
1552 | "ipt_%s", m->u.user.name); |
1553 | if (IS_ERR(match) || !match) { | |
1554 | duprintf("compat_check_calc_match: `%s' not found\n", | |
4b478248 | 1555 | m->u.user.name); |
2722971c DM |
1556 | return match ? PTR_ERR(match) : -ENOENT; |
1557 | } | |
1558 | m->u.kernel.match = match; | |
9fa492cd | 1559 | *size += xt_compat_match_offset(match); |
2722971c DM |
1560 | |
1561 | (*i)++; | |
1562 | return 0; | |
1563 | } | |
1564 | ||
022748a9 | 1565 | static int |
4c1b52bc DM |
1566 | compat_release_match(struct ipt_entry_match *m, unsigned int *i) |
1567 | { | |
1568 | if (i && (*i)-- == 0) | |
1569 | return 1; | |
1570 | ||
1571 | module_put(m->u.kernel.match->me); | |
1572 | return 0; | |
1573 | } | |
1574 | ||
022748a9 | 1575 | static int |
73cd598d | 1576 | compat_release_entry(struct compat_ipt_entry *e, unsigned int *i) |
4c1b52bc DM |
1577 | { |
1578 | struct ipt_entry_target *t; | |
1579 | ||
1580 | if (i && (*i)-- == 0) | |
1581 | return 1; | |
1582 | ||
1583 | /* Cleanup all matches */ | |
73cd598d PM |
1584 | COMPAT_IPT_MATCH_ITERATE(e, compat_release_match, NULL); |
1585 | t = compat_ipt_get_target(e); | |
4c1b52bc DM |
1586 | module_put(t->u.kernel.target->me); |
1587 | return 0; | |
1588 | } | |
1589 | ||
022748a9 | 1590 | static int |
73cd598d | 1591 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1592 | struct xt_table_info *newinfo, |
1593 | unsigned int *size, | |
1594 | unsigned char *base, | |
1595 | unsigned char *limit, | |
1596 | unsigned int *hook_entries, | |
1597 | unsigned int *underflows, | |
1598 | unsigned int *i, | |
1599 | const char *name) | |
2722971c DM |
1600 | { |
1601 | struct ipt_entry_target *t; | |
6709dbbb | 1602 | struct xt_target *target; |
e5b5ef7d | 1603 | unsigned int entry_offset; |
b0a6363c PM |
1604 | unsigned int j; |
1605 | int ret, off, h; | |
2722971c DM |
1606 | |
1607 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
1608 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 | |
1609 | || (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { | |
1610 | duprintf("Bad offset %p, limit = %p\n", e, limit); | |
1611 | return -EINVAL; | |
1612 | } | |
1613 | ||
1614 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1615 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1616 | duprintf("checking: element %p size %u\n", |
1617 | e, e->next_offset); | |
1618 | return -EINVAL; | |
1619 | } | |
1620 | ||
73cd598d PM |
1621 | /* For purposes of check_entry casting the compat entry is fine */ |
1622 | ret = check_entry((struct ipt_entry *)e, name); | |
a96be246 DM |
1623 | if (ret) |
1624 | return ret; | |
590bdf7f | 1625 | |
30c08c41 | 1626 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1627 | entry_offset = (void *)e - (void *)base; |
1628 | j = 0; | |
73cd598d PM |
1629 | ret = COMPAT_IPT_MATCH_ITERATE(e, compat_find_calc_match, name, |
1630 | &e->ip, e->comefrom, &off, &j); | |
2722971c | 1631 | if (ret != 0) |
4c1b52bc | 1632 | goto release_matches; |
2722971c | 1633 | |
73cd598d | 1634 | t = compat_ipt_get_target(e); |
2722971c | 1635 | target = try_then_request_module(xt_find_target(AF_INET, |
4b478248 PM |
1636 | t->u.user.name, |
1637 | t->u.user.revision), | |
2722971c DM |
1638 | "ipt_%s", t->u.user.name); |
1639 | if (IS_ERR(target) || !target) { | |
a96be246 | 1640 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1641 | t->u.user.name); |
2722971c | 1642 | ret = target ? PTR_ERR(target) : -ENOENT; |
4c1b52bc | 1643 | goto release_matches; |
2722971c DM |
1644 | } |
1645 | t->u.kernel.target = target; | |
1646 | ||
9fa492cd | 1647 | off += xt_compat_target_offset(target); |
2722971c | 1648 | *size += off; |
b386d9f5 | 1649 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1650 | if (ret) |
1651 | goto out; | |
1652 | ||
1653 | /* Check hooks & underflows */ | |
6e23ae2a | 1654 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1655 | if ((unsigned char *)e - base == hook_entries[h]) |
1656 | newinfo->hook_entry[h] = hook_entries[h]; | |
1657 | if ((unsigned char *)e - base == underflows[h]) | |
1658 | newinfo->underflow[h] = underflows[h]; | |
1659 | } | |
1660 | ||
1661 | /* Clear counters and comefrom */ | |
73cd598d | 1662 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c DM |
1663 | e->comefrom = 0; |
1664 | ||
1665 | (*i)++; | |
1666 | return 0; | |
bec71b16 | 1667 | |
2722971c | 1668 | out: |
bec71b16 | 1669 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1670 | release_matches: |
1671 | IPT_MATCH_ITERATE(e, compat_release_match, &j); | |
2722971c DM |
1672 | return ret; |
1673 | } | |
1674 | ||
4b478248 | 1675 | static int |
73cd598d | 1676 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1677 | unsigned int *size, const char *name, |
1678 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c DM |
1679 | { |
1680 | struct ipt_entry_target *t; | |
6709dbbb | 1681 | struct xt_target *target; |
2722971c DM |
1682 | struct ipt_entry *de; |
1683 | unsigned int origsize; | |
920b868a | 1684 | int ret, h; |
2722971c DM |
1685 | |
1686 | ret = 0; | |
1687 | origsize = *size; | |
1688 | de = (struct ipt_entry *)*dstptr; | |
1689 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1690 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1691 | |
73cd598d | 1692 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1693 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1694 | ||
73cd598d PM |
1695 | ret = COMPAT_IPT_MATCH_ITERATE(e, xt_compat_match_from_user, |
1696 | dstptr, size); | |
2722971c | 1697 | if (ret) |
f6677f43 | 1698 | return ret; |
2722971c | 1699 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1700 | t = compat_ipt_get_target(e); |
2722971c | 1701 | target = t->u.kernel.target; |
9fa492cd | 1702 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1703 | |
1704 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1705 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1706 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1707 | newinfo->hook_entry[h] -= origsize - *size; | |
1708 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1709 | newinfo->underflow[h] -= origsize - *size; | |
1710 | } | |
f6677f43 DM |
1711 | return ret; |
1712 | } | |
1713 | ||
022748a9 DV |
1714 | static int |
1715 | compat_check_entry(struct ipt_entry *e, const char *name, | |
4b478248 | 1716 | unsigned int *i) |
f6677f43 | 1717 | { |
9b4fce7a | 1718 | struct xt_mtchk_param mtpar; |
b0a6363c PM |
1719 | unsigned int j; |
1720 | int ret; | |
f6677f43 | 1721 | |
4c1b52bc | 1722 | j = 0; |
9b4fce7a JE |
1723 | mtpar.table = name; |
1724 | mtpar.entryinfo = &e->ip; | |
1725 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1726 | mtpar.family = NFPROTO_IPV4; |
9b4fce7a | 1727 | ret = IPT_MATCH_ITERATE(e, check_match, &mtpar, &j); |
f6677f43 | 1728 | if (ret) |
4c1b52bc DM |
1729 | goto cleanup_matches; |
1730 | ||
1731 | ret = check_target(e, name); | |
1732 | if (ret) | |
1733 | goto cleanup_matches; | |
f6677f43 | 1734 | |
4c1b52bc DM |
1735 | (*i)++; |
1736 | return 0; | |
1737 | ||
1738 | cleanup_matches: | |
1739 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
1740 | return ret; | |
f6677f43 DM |
1741 | } |
1742 | ||
1da177e4 | 1743 | static int |
2722971c | 1744 | translate_compat_table(const char *name, |
4b478248 PM |
1745 | unsigned int valid_hooks, |
1746 | struct xt_table_info **pinfo, | |
1747 | void **pentry0, | |
1748 | unsigned int total_size, | |
1749 | unsigned int number, | |
1750 | unsigned int *hook_entries, | |
1751 | unsigned int *underflows) | |
1da177e4 | 1752 | { |
920b868a | 1753 | unsigned int i, j; |
2722971c DM |
1754 | struct xt_table_info *newinfo, *info; |
1755 | void *pos, *entry0, *entry1; | |
1756 | unsigned int size; | |
1da177e4 | 1757 | int ret; |
1da177e4 | 1758 | |
2722971c DM |
1759 | info = *pinfo; |
1760 | entry0 = *pentry0; | |
1761 | size = total_size; | |
1762 | info->number = number; | |
1763 | ||
1764 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1765 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1766 | info->hook_entry[i] = 0xFFFFFFFF; |
1767 | info->underflow[i] = 0xFFFFFFFF; | |
1768 | } | |
1769 | ||
1770 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1771 | j = 0; |
2722971c DM |
1772 | xt_compat_lock(AF_INET); |
1773 | /* Walk through entries, checking offsets. */ | |
73cd598d PM |
1774 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
1775 | check_compat_entry_size_and_hooks, | |
1776 | info, &size, entry0, | |
1777 | entry0 + total_size, | |
1778 | hook_entries, underflows, &j, name); | |
2722971c DM |
1779 | if (ret != 0) |
1780 | goto out_unlock; | |
1781 | ||
1782 | ret = -EINVAL; | |
920b868a | 1783 | if (j != number) { |
2722971c | 1784 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1785 | j, number); |
2722971c DM |
1786 | goto out_unlock; |
1787 | } | |
1788 | ||
1789 | /* Check hooks all assigned */ | |
6e23ae2a | 1790 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1791 | /* Only hooks which are valid */ |
1792 | if (!(valid_hooks & (1 << i))) | |
1793 | continue; | |
1794 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1795 | duprintf("Invalid hook entry %u %u\n", | |
1796 | i, hook_entries[i]); | |
1797 | goto out_unlock; | |
1da177e4 | 1798 | } |
2722971c DM |
1799 | if (info->underflow[i] == 0xFFFFFFFF) { |
1800 | duprintf("Invalid underflow %u %u\n", | |
1801 | i, underflows[i]); | |
1802 | goto out_unlock; | |
1803 | } | |
1804 | } | |
1805 | ||
1806 | ret = -ENOMEM; | |
1807 | newinfo = xt_alloc_table_info(size); | |
1808 | if (!newinfo) | |
1809 | goto out_unlock; | |
1810 | ||
1811 | newinfo->number = number; | |
6e23ae2a | 1812 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1813 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1814 | newinfo->underflow[i] = info->underflow[i]; | |
1815 | } | |
1816 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1817 | pos = entry1; | |
4b478248 | 1818 | size = total_size; |
73cd598d | 1819 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
9c547959 PM |
1820 | compat_copy_entry_from_user, |
1821 | &pos, &size, name, newinfo, entry1); | |
b386d9f5 | 1822 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1823 | xt_compat_unlock(AF_INET); |
1824 | if (ret) | |
1825 | goto free_newinfo; | |
1826 | ||
1827 | ret = -ELOOP; | |
1828 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1829 | goto free_newinfo; | |
1830 | ||
4c1b52bc | 1831 | i = 0; |
f6677f43 | 1832 | ret = IPT_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry, |
4b478248 | 1833 | name, &i); |
4c1b52bc DM |
1834 | if (ret) { |
1835 | j -= i; | |
73cd598d PM |
1836 | COMPAT_IPT_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i, |
1837 | compat_release_entry, &j); | |
4c1b52bc DM |
1838 | IPT_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i); |
1839 | xt_free_table_info(newinfo); | |
1840 | return ret; | |
1841 | } | |
f6677f43 | 1842 | |
2722971c | 1843 | /* And one copy for every other CPU */ |
fb1bb34d | 1844 | for_each_possible_cpu(i) |
2722971c DM |
1845 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1846 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1847 | ||
1848 | *pinfo = newinfo; | |
1849 | *pentry0 = entry1; | |
1850 | xt_free_table_info(info); | |
1851 | return 0; | |
1da177e4 | 1852 | |
2722971c DM |
1853 | free_newinfo: |
1854 | xt_free_table_info(newinfo); | |
1855 | out: | |
73cd598d | 1856 | COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j); |
1da177e4 | 1857 | return ret; |
2722971c | 1858 | out_unlock: |
b386d9f5 | 1859 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1860 | xt_compat_unlock(AF_INET); |
1861 | goto out; | |
1da177e4 LT |
1862 | } |
1863 | ||
1864 | static int | |
34bd137b | 1865 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1866 | { |
1867 | int ret; | |
2722971c DM |
1868 | struct compat_ipt_replace tmp; |
1869 | struct xt_table_info *newinfo; | |
1870 | void *loc_cpu_entry; | |
1da177e4 LT |
1871 | |
1872 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1873 | return -EFAULT; | |
1874 | ||
ee4bb818 | 1875 | /* overflow check */ |
259d4e41 | 1876 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1877 | return -ENOMEM; |
1878 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1879 | return -ENOMEM; | |
1880 | ||
2e4e6a17 | 1881 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1882 | if (!newinfo) |
1883 | return -ENOMEM; | |
1884 | ||
9c547959 | 1885 | /* choose the copy that is on our node/cpu */ |
31836064 ED |
1886 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1887 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1888 | tmp.size) != 0) { |
1889 | ret = -EFAULT; | |
1890 | goto free_newinfo; | |
1891 | } | |
1892 | ||
2722971c | 1893 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, |
4b478248 PM |
1894 | &newinfo, &loc_cpu_entry, tmp.size, |
1895 | tmp.num_entries, tmp.hook_entry, | |
1896 | tmp.underflow); | |
2722971c | 1897 | if (ret != 0) |
1da177e4 | 1898 | goto free_newinfo; |
1da177e4 | 1899 | |
2722971c | 1900 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1901 | |
34bd137b | 1902 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1903 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1904 | if (ret) |
1905 | goto free_newinfo_untrans; | |
1906 | return 0; | |
1da177e4 | 1907 | |
2722971c | 1908 | free_newinfo_untrans: |
4b478248 | 1909 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
2722971c DM |
1910 | free_newinfo: |
1911 | xt_free_table_info(newinfo); | |
1912 | return ret; | |
1913 | } | |
1da177e4 | 1914 | |
2722971c DM |
1915 | static int |
1916 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1917 | unsigned int len) |
2722971c DM |
1918 | { |
1919 | int ret; | |
1da177e4 | 1920 | |
2722971c DM |
1921 | if (!capable(CAP_NET_ADMIN)) |
1922 | return -EPERM; | |
1da177e4 | 1923 | |
2722971c DM |
1924 | switch (cmd) { |
1925 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1926 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1927 | break; |
1da177e4 | 1928 | |
2722971c | 1929 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1930 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1931 | break; |
1932 | ||
1933 | default: | |
1934 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1935 | ret = -EINVAL; | |
1936 | } | |
1da177e4 | 1937 | |
1da177e4 LT |
1938 | return ret; |
1939 | } | |
1940 | ||
4b478248 | 1941 | struct compat_ipt_get_entries { |
2722971c DM |
1942 | char name[IPT_TABLE_MAXNAMELEN]; |
1943 | compat_uint_t size; | |
1944 | struct compat_ipt_entry entrytable[0]; | |
1945 | }; | |
1da177e4 | 1946 | |
4b478248 PM |
1947 | static int |
1948 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1949 | void __user *userptr) | |
2722971c | 1950 | { |
2722971c | 1951 | struct xt_counters *counters; |
5452e425 | 1952 | const struct xt_table_info *private = table->private; |
2722971c DM |
1953 | void __user *pos; |
1954 | unsigned int size; | |
1955 | int ret = 0; | |
5452e425 | 1956 | const void *loc_cpu_entry; |
a18aa31b | 1957 | unsigned int i = 0; |
1da177e4 | 1958 | |
2722971c DM |
1959 | counters = alloc_counters(table); |
1960 | if (IS_ERR(counters)) | |
1961 | return PTR_ERR(counters); | |
1962 | ||
1963 | /* choose the copy that is on our node/cpu, ... | |
1964 | * This choice is lazy (because current thread is | |
1965 | * allowed to migrate to another cpu) | |
1966 | */ | |
1967 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1968 | pos = userptr; | |
1969 | size = total_size; | |
1970 | ret = IPT_ENTRY_ITERATE(loc_cpu_entry, total_size, | |
a18aa31b PM |
1971 | compat_copy_entry_to_user, |
1972 | &pos, &size, counters, &i); | |
2722971c | 1973 | |
2722971c DM |
1974 | vfree(counters); |
1975 | return ret; | |
1da177e4 LT |
1976 | } |
1977 | ||
1978 | static int | |
34bd137b AD |
1979 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1980 | int *len) | |
1da177e4 | 1981 | { |
2722971c DM |
1982 | int ret; |
1983 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1984 | struct xt_table *t; |
1da177e4 | 1985 | |
2722971c | 1986 | if (*len < sizeof(get)) { |
c9d8fe13 | 1987 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1988 | return -EINVAL; |
2722971c | 1989 | } |
1da177e4 | 1990 | |
2722971c DM |
1991 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1992 | return -EFAULT; | |
1da177e4 | 1993 | |
2722971c | 1994 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1995 | duprintf("compat_get_entries: %u != %zu\n", |
1996 | *len, sizeof(get) + get.size); | |
2722971c | 1997 | return -EINVAL; |
1da177e4 LT |
1998 | } |
1999 | ||
2722971c | 2000 | xt_compat_lock(AF_INET); |
34bd137b | 2001 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 2002 | if (t && !IS_ERR(t)) { |
5452e425 | 2003 | const struct xt_table_info *private = t->private; |
2722971c | 2004 | struct xt_table_info info; |
9c547959 | 2005 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
2006 | ret = compat_table_info(private, &info); |
2007 | if (!ret && get.size == info.size) { | |
2008 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 2009 | t, uptr->entrytable); |
2722971c DM |
2010 | } else if (!ret) { |
2011 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 2012 | private->size, get.size); |
544473c1 | 2013 | ret = -EAGAIN; |
2722971c | 2014 | } |
b386d9f5 | 2015 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
2016 | module_put(t->me); |
2017 | xt_table_unlock(t); | |
2018 | } else | |
1da177e4 | 2019 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 2020 | |
2722971c DM |
2021 | xt_compat_unlock(AF_INET); |
2022 | return ret; | |
2023 | } | |
1da177e4 | 2024 | |
79030ed0 PM |
2025 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
2026 | ||
2722971c DM |
2027 | static int |
2028 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2029 | { | |
2030 | int ret; | |
1da177e4 | 2031 | |
82fac054 BS |
2032 | if (!capable(CAP_NET_ADMIN)) |
2033 | return -EPERM; | |
2034 | ||
2722971c DM |
2035 | switch (cmd) { |
2036 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 2037 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
2038 | break; |
2039 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 2040 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
2041 | break; |
2042 | default: | |
79030ed0 | 2043 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 2044 | } |
1da177e4 LT |
2045 | return ret; |
2046 | } | |
2722971c | 2047 | #endif |
1da177e4 LT |
2048 | |
2049 | static int | |
9c547959 | 2050 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
2051 | { |
2052 | int ret; | |
2053 | ||
2054 | if (!capable(CAP_NET_ADMIN)) | |
2055 | return -EPERM; | |
2056 | ||
2057 | switch (cmd) { | |
2058 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 2059 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2060 | break; |
2061 | ||
2062 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2063 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2064 | break; |
2065 | ||
2066 | default: | |
2067 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
2068 | ret = -EINVAL; | |
2069 | } | |
2070 | ||
2071 | return ret; | |
2072 | } | |
2073 | ||
2074 | static int | |
2075 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2076 | { | |
2077 | int ret; | |
2078 | ||
2079 | if (!capable(CAP_NET_ADMIN)) | |
2080 | return -EPERM; | |
2081 | ||
2082 | switch (cmd) { | |
2722971c | 2083 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2084 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2085 | break; |
1da177e4 | 2086 | |
2722971c | 2087 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2088 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2089 | break; |
1da177e4 LT |
2090 | |
2091 | case IPT_SO_GET_REVISION_MATCH: | |
2092 | case IPT_SO_GET_REVISION_TARGET: { | |
2093 | struct ipt_get_revision rev; | |
2e4e6a17 | 2094 | int target; |
1da177e4 LT |
2095 | |
2096 | if (*len != sizeof(rev)) { | |
2097 | ret = -EINVAL; | |
2098 | break; | |
2099 | } | |
2100 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2101 | ret = -EFAULT; | |
2102 | break; | |
2103 | } | |
2104 | ||
2105 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2106 | target = 1; |
1da177e4 | 2107 | else |
2e4e6a17 | 2108 | target = 0; |
1da177e4 | 2109 | |
2e4e6a17 HW |
2110 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2111 | rev.revision, | |
2112 | target, &ret), | |
1da177e4 LT |
2113 | "ipt_%s", rev.name); |
2114 | break; | |
2115 | } | |
2116 | ||
2117 | default: | |
2118 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2119 | ret = -EINVAL; | |
2120 | } | |
2121 | ||
2122 | return ret; | |
2123 | } | |
2124 | ||
44d34e72 AD |
2125 | struct xt_table *ipt_register_table(struct net *net, struct xt_table *table, |
2126 | const struct ipt_replace *repl) | |
1da177e4 LT |
2127 | { |
2128 | int ret; | |
2e4e6a17 | 2129 | struct xt_table_info *newinfo; |
259d4e41 | 2130 | struct xt_table_info bootstrap |
1da177e4 | 2131 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2132 | void *loc_cpu_entry; |
a98da11d | 2133 | struct xt_table *new_table; |
1da177e4 | 2134 | |
2e4e6a17 | 2135 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2136 | if (!newinfo) { |
2137 | ret = -ENOMEM; | |
2138 | goto out; | |
2139 | } | |
1da177e4 | 2140 | |
9c547959 | 2141 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2142 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2143 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
2144 | |
2145 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 2146 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
2147 | repl->num_entries, |
2148 | repl->hook_entry, | |
2149 | repl->underflow); | |
44d34e72 AD |
2150 | if (ret != 0) |
2151 | goto out_free; | |
1da177e4 | 2152 | |
44d34e72 | 2153 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2154 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2155 | ret = PTR_ERR(new_table); |
2156 | goto out_free; | |
1da177e4 LT |
2157 | } |
2158 | ||
44d34e72 AD |
2159 | return new_table; |
2160 | ||
2161 | out_free: | |
2162 | xt_free_table_info(newinfo); | |
2163 | out: | |
2164 | return ERR_PTR(ret); | |
1da177e4 LT |
2165 | } |
2166 | ||
e60a13e0 | 2167 | void ipt_unregister_table(struct xt_table *table) |
1da177e4 | 2168 | { |
2e4e6a17 | 2169 | struct xt_table_info *private; |
31836064 | 2170 | void *loc_cpu_entry; |
df200969 | 2171 | struct module *table_owner = table->me; |
31836064 | 2172 | |
e905a9ed | 2173 | private = xt_unregister_table(table); |
1da177e4 LT |
2174 | |
2175 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
2176 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
2177 | IPT_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
df200969 AD |
2178 | if (private->number > private->initial_entries) |
2179 | module_put(table_owner); | |
2e4e6a17 | 2180 | xt_free_table_info(private); |
1da177e4 LT |
2181 | } |
2182 | ||
2183 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2184 | static inline bool |
1da177e4 LT |
2185 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2186 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2187 | bool invert) |
1da177e4 | 2188 | { |
9c547959 PM |
2189 | return ((test_type == 0xFF) || |
2190 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2191 | ^ invert; |
2192 | } | |
2193 | ||
1d93a9cb | 2194 | static bool |
f7108a20 | 2195 | icmp_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2196 | { |
5452e425 JE |
2197 | const struct icmphdr *ic; |
2198 | struct icmphdr _icmph; | |
f7108a20 | 2199 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2200 | |
2201 | /* Must not be a fragment. */ | |
f7108a20 | 2202 | if (par->fragoff != 0) |
1d93a9cb | 2203 | return false; |
1da177e4 | 2204 | |
f7108a20 | 2205 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2206 | if (ic == NULL) { |
2207 | /* We've been asked to examine this packet, and we | |
2208 | * can't. Hence, no choice but to drop. | |
2209 | */ | |
2210 | duprintf("Dropping evil ICMP tinygram.\n"); | |
f7108a20 | 2211 | *par->hotdrop = true; |
1d93a9cb | 2212 | return false; |
1da177e4 LT |
2213 | } |
2214 | ||
2215 | return icmp_type_code_match(icmpinfo->type, | |
2216 | icmpinfo->code[0], | |
2217 | icmpinfo->code[1], | |
2218 | ic->type, ic->code, | |
2219 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2220 | } | |
2221 | ||
9b4fce7a | 2222 | static bool icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2223 | { |
9b4fce7a | 2224 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2225 | |
1d5cd909 PM |
2226 | /* Must specify no unknown invflags */ |
2227 | return !(icmpinfo->invflags & ~IPT_ICMP_INV); | |
1da177e4 LT |
2228 | } |
2229 | ||
2230 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2231 | static struct xt_target ipt_standard_target __read_mostly = { |
1da177e4 | 2232 | .name = IPT_STANDARD_TARGET, |
1d5cd909 | 2233 | .targetsize = sizeof(int), |
a45049c5 | 2234 | .family = AF_INET, |
2722971c | 2235 | #ifdef CONFIG_COMPAT |
9fa492cd PM |
2236 | .compatsize = sizeof(compat_int_t), |
2237 | .compat_from_user = compat_standard_from_user, | |
2238 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2239 | #endif |
1da177e4 LT |
2240 | }; |
2241 | ||
9f15c530 | 2242 | static struct xt_target ipt_error_target __read_mostly = { |
1da177e4 LT |
2243 | .name = IPT_ERROR_TARGET, |
2244 | .target = ipt_error, | |
1d5cd909 | 2245 | .targetsize = IPT_FUNCTION_MAXNAMELEN, |
a45049c5 | 2246 | .family = AF_INET, |
1da177e4 LT |
2247 | }; |
2248 | ||
2249 | static struct nf_sockopt_ops ipt_sockopts = { | |
2250 | .pf = PF_INET, | |
2251 | .set_optmin = IPT_BASE_CTL, | |
2252 | .set_optmax = IPT_SO_SET_MAX+1, | |
2253 | .set = do_ipt_set_ctl, | |
2722971c DM |
2254 | #ifdef CONFIG_COMPAT |
2255 | .compat_set = compat_do_ipt_set_ctl, | |
2256 | #endif | |
1da177e4 LT |
2257 | .get_optmin = IPT_BASE_CTL, |
2258 | .get_optmax = IPT_SO_GET_MAX+1, | |
2259 | .get = do_ipt_get_ctl, | |
2722971c DM |
2260 | #ifdef CONFIG_COMPAT |
2261 | .compat_get = compat_do_ipt_get_ctl, | |
2262 | #endif | |
16fcec35 | 2263 | .owner = THIS_MODULE, |
1da177e4 LT |
2264 | }; |
2265 | ||
9f15c530 | 2266 | static struct xt_match icmp_matchstruct __read_mostly = { |
1da177e4 | 2267 | .name = "icmp", |
1d5cd909 PM |
2268 | .match = icmp_match, |
2269 | .matchsize = sizeof(struct ipt_icmp), | |
9c547959 | 2270 | .checkentry = icmp_checkentry, |
1d5cd909 | 2271 | .proto = IPPROTO_ICMP, |
a45049c5 | 2272 | .family = AF_INET, |
1da177e4 LT |
2273 | }; |
2274 | ||
3cb609d5 AD |
2275 | static int __net_init ip_tables_net_init(struct net *net) |
2276 | { | |
2277 | return xt_proto_init(net, AF_INET); | |
2278 | } | |
2279 | ||
2280 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2281 | { | |
2282 | xt_proto_fini(net, AF_INET); | |
2283 | } | |
2284 | ||
2285 | static struct pernet_operations ip_tables_net_ops = { | |
2286 | .init = ip_tables_net_init, | |
2287 | .exit = ip_tables_net_exit, | |
2288 | }; | |
2289 | ||
65b4b4e8 | 2290 | static int __init ip_tables_init(void) |
1da177e4 LT |
2291 | { |
2292 | int ret; | |
2293 | ||
3cb609d5 | 2294 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2295 | if (ret < 0) |
2296 | goto err1; | |
2e4e6a17 | 2297 | |
1da177e4 | 2298 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2299 | ret = xt_register_target(&ipt_standard_target); |
2300 | if (ret < 0) | |
2301 | goto err2; | |
2302 | ret = xt_register_target(&ipt_error_target); | |
2303 | if (ret < 0) | |
2304 | goto err3; | |
2305 | ret = xt_register_match(&icmp_matchstruct); | |
2306 | if (ret < 0) | |
2307 | goto err4; | |
1da177e4 LT |
2308 | |
2309 | /* Register setsockopt */ | |
2310 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2311 | if (ret < 0) |
2312 | goto err5; | |
1da177e4 | 2313 | |
0236e667 | 2314 | printk(KERN_INFO "ip_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2315 | return 0; |
0eff66e6 PM |
2316 | |
2317 | err5: | |
2318 | xt_unregister_match(&icmp_matchstruct); | |
2319 | err4: | |
2320 | xt_unregister_target(&ipt_error_target); | |
2321 | err3: | |
2322 | xt_unregister_target(&ipt_standard_target); | |
2323 | err2: | |
3cb609d5 | 2324 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2325 | err1: |
2326 | return ret; | |
1da177e4 LT |
2327 | } |
2328 | ||
65b4b4e8 | 2329 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2330 | { |
2331 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2332 | |
a45049c5 PNA |
2333 | xt_unregister_match(&icmp_matchstruct); |
2334 | xt_unregister_target(&ipt_error_target); | |
2335 | xt_unregister_target(&ipt_standard_target); | |
2e4e6a17 | 2336 | |
3cb609d5 | 2337 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2338 | } |
2339 | ||
2340 | EXPORT_SYMBOL(ipt_register_table); | |
2341 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2342 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2343 | module_init(ip_tables_init); |
2344 | module_exit(ip_tables_fini); |