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 | { | |
1da177e4 LT |
86 | unsigned long ret; |
87 | ||
e79ec50b | 88 | #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) |
1da177e4 LT |
89 | |
90 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, | |
91 | IPT_INV_SRCIP) | |
92 | || FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, | |
93 | IPT_INV_DSTIP)) { | |
94 | dprintf("Source or dest mismatch.\n"); | |
95 | ||
cffee385 HH |
96 | dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n", |
97 | &ip->saddr, &ipinfo->smsk.s_addr, &ipinfo->src.s_addr, | |
1da177e4 | 98 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); |
cffee385 HH |
99 | dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n", |
100 | &ip->daddr, &ipinfo->dmsk.s_addr, &ipinfo->dst.s_addr, | |
1da177e4 | 101 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); |
9c547959 | 102 | return false; |
1da177e4 LT |
103 | } |
104 | ||
b8dfe498 | 105 | ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask); |
1da177e4 LT |
106 | |
107 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { | |
108 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
109 | indev, ipinfo->iniface, | |
110 | ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":""); | |
9c547959 | 111 | return false; |
1da177e4 LT |
112 | } |
113 | ||
b8dfe498 | 114 | ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
1da177e4 LT |
115 | |
116 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { | |
117 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
118 | outdev, ipinfo->outiface, | |
119 | ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":""); | |
9c547959 | 120 | return false; |
1da177e4 LT |
121 | } |
122 | ||
123 | /* Check specific protocol */ | |
124 | if (ipinfo->proto | |
125 | && FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { | |
126 | dprintf("Packet protocol %hi does not match %hi.%s\n", | |
127 | ip->protocol, ipinfo->proto, | |
128 | ipinfo->invflags&IPT_INV_PROTO ? " (INV)":""); | |
9c547959 | 129 | return false; |
1da177e4 LT |
130 | } |
131 | ||
132 | /* If we have a fragment rule but the packet is not a fragment | |
133 | * then we return zero */ | |
134 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { | |
135 | dprintf("Fragment rule but not fragment.%s\n", | |
136 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); | |
9c547959 | 137 | return false; |
1da177e4 LT |
138 | } |
139 | ||
9c547959 | 140 | return true; |
1da177e4 LT |
141 | } |
142 | ||
022748a9 | 143 | static bool |
1da177e4 LT |
144 | ip_checkentry(const struct ipt_ip *ip) |
145 | { | |
146 | if (ip->flags & ~IPT_F_MASK) { | |
147 | duprintf("Unknown flag bits set: %08X\n", | |
148 | ip->flags & ~IPT_F_MASK); | |
ccb79bdc | 149 | return false; |
1da177e4 LT |
150 | } |
151 | if (ip->invflags & ~IPT_INV_MASK) { | |
152 | duprintf("Unknown invflag bits set: %08X\n", | |
153 | ip->invflags & ~IPT_INV_MASK); | |
ccb79bdc | 154 | return false; |
1da177e4 | 155 | } |
ccb79bdc | 156 | return true; |
1da177e4 LT |
157 | } |
158 | ||
159 | static unsigned int | |
7eb35586 | 160 | ipt_error(struct sk_buff *skb, const struct xt_target_param *par) |
1da177e4 LT |
161 | { |
162 | if (net_ratelimit()) | |
7eb35586 JE |
163 | printk("ip_tables: error: `%s'\n", |
164 | (const char *)par->targinfo); | |
1da177e4 LT |
165 | |
166 | return NF_DROP; | |
167 | } | |
168 | ||
022748a9 DV |
169 | /* Performance critical - called for every packet */ |
170 | static inline bool | |
f7108a20 JE |
171 | do_match(struct ipt_entry_match *m, const struct sk_buff *skb, |
172 | struct xt_match_param *par) | |
1da177e4 | 173 | { |
f7108a20 JE |
174 | par->match = m->u.kernel.match; |
175 | par->matchinfo = m->data; | |
176 | ||
1da177e4 | 177 | /* Stop iteration if it doesn't match */ |
f7108a20 | 178 | if (!m->u.kernel.match->match(skb, par)) |
1d93a9cb | 179 | return true; |
1da177e4 | 180 | else |
1d93a9cb | 181 | return false; |
1da177e4 LT |
182 | } |
183 | ||
022748a9 | 184 | /* Performance critical */ |
1da177e4 LT |
185 | static inline struct ipt_entry * |
186 | get_entry(void *base, unsigned int offset) | |
187 | { | |
188 | return (struct ipt_entry *)(base + offset); | |
189 | } | |
190 | ||
ba9dda3a | 191 | /* All zeroes == unconditional rule. */ |
022748a9 | 192 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
193 | static inline int |
194 | unconditional(const struct ipt_ip *ip) | |
195 | { | |
196 | unsigned int i; | |
197 | ||
198 | for (i = 0; i < sizeof(*ip)/sizeof(__u32); i++) | |
199 | if (((__u32 *)ip)[i]) | |
200 | return 0; | |
201 | ||
202 | return 1; | |
e79ec50b | 203 | #undef FWINV |
ba9dda3a JK |
204 | } |
205 | ||
206 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
207 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
022748a9 | 208 | static const char *const hooknames[] = { |
6e23ae2a PM |
209 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
210 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 211 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
212 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
213 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
214 | }; |
215 | ||
216 | enum nf_ip_trace_comments { | |
217 | NF_IP_TRACE_COMMENT_RULE, | |
218 | NF_IP_TRACE_COMMENT_RETURN, | |
219 | NF_IP_TRACE_COMMENT_POLICY, | |
220 | }; | |
221 | ||
022748a9 | 222 | static const char *const comments[] = { |
ba9dda3a JK |
223 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
224 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
225 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
226 | }; | |
227 | ||
228 | static struct nf_loginfo trace_loginfo = { | |
229 | .type = NF_LOG_TYPE_LOG, | |
230 | .u = { | |
231 | .log = { | |
232 | .level = 4, | |
233 | .logflags = NF_LOG_MASK, | |
234 | }, | |
235 | }, | |
236 | }; | |
237 | ||
022748a9 | 238 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
239 | static inline int |
240 | get_chainname_rulenum(struct ipt_entry *s, struct ipt_entry *e, | |
241 | char *hookname, char **chainname, | |
242 | char **comment, unsigned int *rulenum) | |
243 | { | |
244 | struct ipt_standard_target *t = (void *)ipt_get_target(s); | |
245 | ||
246 | if (strcmp(t->target.u.kernel.target->name, IPT_ERROR_TARGET) == 0) { | |
247 | /* Head of user chain: ERROR target with chainname */ | |
248 | *chainname = t->target.data; | |
249 | (*rulenum) = 0; | |
250 | } else if (s == e) { | |
251 | (*rulenum)++; | |
252 | ||
253 | if (s->target_offset == sizeof(struct ipt_entry) | |
254 | && strcmp(t->target.u.kernel.target->name, | |
255 | IPT_STANDARD_TARGET) == 0 | |
256 | && t->verdict < 0 | |
257 | && unconditional(&s->ip)) { | |
258 | /* Tail of chains: STANDARD target (return/policy) */ | |
259 | *comment = *chainname == hookname | |
260 | ? (char *)comments[NF_IP_TRACE_COMMENT_POLICY] | |
261 | : (char *)comments[NF_IP_TRACE_COMMENT_RETURN]; | |
262 | } | |
263 | return 1; | |
264 | } else | |
265 | (*rulenum)++; | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | static void trace_packet(struct sk_buff *skb, | |
271 | unsigned int hook, | |
272 | const struct net_device *in, | |
273 | const struct net_device *out, | |
ecb6f85e | 274 | const char *tablename, |
ba9dda3a JK |
275 | struct xt_table_info *private, |
276 | struct ipt_entry *e) | |
277 | { | |
278 | void *table_base; | |
5452e425 | 279 | const struct ipt_entry *root; |
ba9dda3a JK |
280 | char *hookname, *chainname, *comment; |
281 | unsigned int rulenum = 0; | |
282 | ||
ccf5bd8c | 283 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
284 | root = get_entry(table_base, private->hook_entry[hook]); |
285 | ||
286 | hookname = chainname = (char *)hooknames[hook]; | |
287 | comment = (char *)comments[NF_IP_TRACE_COMMENT_RULE]; | |
288 | ||
289 | IPT_ENTRY_ITERATE(root, | |
290 | private->size - private->hook_entry[hook], | |
291 | get_chainname_rulenum, | |
292 | e, hookname, &chainname, &comment, &rulenum); | |
293 | ||
294 | nf_log_packet(AF_INET, hook, skb, in, out, &trace_loginfo, | |
295 | "TRACE: %s:%s:%s:%u ", | |
296 | tablename, chainname, comment, rulenum); | |
297 | } | |
298 | #endif | |
299 | ||
1da177e4 LT |
300 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
301 | unsigned int | |
3db05fea | 302 | ipt_do_table(struct sk_buff *skb, |
1da177e4 LT |
303 | unsigned int hook, |
304 | const struct net_device *in, | |
305 | const struct net_device *out, | |
e60a13e0 | 306 | struct xt_table *table) |
1da177e4 LT |
307 | { |
308 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); | |
5452e425 | 309 | const struct iphdr *ip; |
1da177e4 | 310 | u_int16_t datalen; |
cff533ac | 311 | bool hotdrop = false; |
1da177e4 LT |
312 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
313 | unsigned int verdict = NF_DROP; | |
314 | const char *indev, *outdev; | |
315 | void *table_base; | |
316 | struct ipt_entry *e, *back; | |
8311731a | 317 | struct xt_table_info *private; |
f7108a20 | 318 | struct xt_match_param mtpar; |
7eb35586 | 319 | struct xt_target_param tgpar; |
1da177e4 LT |
320 | |
321 | /* Initialization */ | |
3db05fea HX |
322 | ip = ip_hdr(skb); |
323 | datalen = skb->len - ip->ihl * 4; | |
1da177e4 LT |
324 | indev = in ? in->name : nulldevname; |
325 | outdev = out ? out->name : nulldevname; | |
326 | /* We handle fragments by dealing with the first fragment as | |
327 | * if it was a normal packet. All other fragments are treated | |
328 | * normally, except that they will NEVER match rules that ask | |
329 | * things we don't know, ie. tcp syn flag or ports). If the | |
330 | * rule is also a fragment-specific rule, non-fragments won't | |
331 | * match it. */ | |
f7108a20 JE |
332 | mtpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
333 | mtpar.thoff = ip_hdrlen(skb); | |
334 | mtpar.hotdrop = &hotdrop; | |
7eb35586 JE |
335 | mtpar.in = tgpar.in = in; |
336 | mtpar.out = tgpar.out = out; | |
916a917d | 337 | mtpar.family = tgpar.family = NFPROTO_IPV4; |
7eb35586 | 338 | tgpar.hooknum = hook; |
1da177e4 | 339 | |
1da177e4 | 340 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
942e4a2b SH |
341 | xt_info_rdlock_bh(); |
342 | private = table->private; | |
343 | table_base = private->entries[smp_processor_id()]; | |
78454473 | 344 | |
2e4e6a17 | 345 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 LT |
346 | |
347 | /* For return from builtin chain */ | |
2e4e6a17 | 348 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
349 | |
350 | do { | |
351 | IP_NF_ASSERT(e); | |
352 | IP_NF_ASSERT(back); | |
f7108a20 JE |
353 | if (ip_packet_match(ip, indev, outdev, |
354 | &e->ip, mtpar.fragoff)) { | |
1da177e4 LT |
355 | struct ipt_entry_target *t; |
356 | ||
f7108a20 | 357 | if (IPT_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) |
1da177e4 LT |
358 | goto no_match; |
359 | ||
360 | ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1); | |
361 | ||
362 | t = ipt_get_target(e); | |
363 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
364 | |
365 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
366 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
367 | /* The packet is traced: log it */ | |
3db05fea HX |
368 | if (unlikely(skb->nf_trace)) |
369 | trace_packet(skb, hook, in, out, | |
ba9dda3a JK |
370 | table->name, private, e); |
371 | #endif | |
1da177e4 LT |
372 | /* Standard target? */ |
373 | if (!t->u.kernel.target->target) { | |
374 | int v; | |
375 | ||
376 | v = ((struct ipt_standard_target *)t)->verdict; | |
377 | if (v < 0) { | |
378 | /* Pop from stack? */ | |
379 | if (v != IPT_RETURN) { | |
380 | verdict = (unsigned)(-v) - 1; | |
381 | break; | |
382 | } | |
383 | e = back; | |
384 | back = get_entry(table_base, | |
385 | back->comefrom); | |
386 | continue; | |
387 | } | |
05465343 PM |
388 | if (table_base + v != (void *)e + e->next_offset |
389 | && !(e->ip.flags & IPT_F_GOTO)) { | |
1da177e4 LT |
390 | /* Save old back ptr in next entry */ |
391 | struct ipt_entry *next | |
392 | = (void *)e + e->next_offset; | |
393 | next->comefrom | |
394 | = (void *)back - table_base; | |
395 | /* set back pointer to next entry */ | |
396 | back = next; | |
397 | } | |
398 | ||
399 | e = get_entry(table_base, v); | |
400 | } else { | |
401 | /* Targets which reenter must return | |
e905a9ed | 402 | abs. verdicts */ |
7eb35586 JE |
403 | tgpar.target = t->u.kernel.target; |
404 | tgpar.targinfo = t->data; | |
1da177e4 LT |
405 | #ifdef CONFIG_NETFILTER_DEBUG |
406 | ((struct ipt_entry *)table_base)->comefrom | |
407 | = 0xeeeeeeec; | |
408 | #endif | |
3db05fea | 409 | verdict = t->u.kernel.target->target(skb, |
7eb35586 | 410 | &tgpar); |
1da177e4 LT |
411 | #ifdef CONFIG_NETFILTER_DEBUG |
412 | if (((struct ipt_entry *)table_base)->comefrom | |
413 | != 0xeeeeeeec | |
414 | && verdict == IPT_CONTINUE) { | |
415 | printk("Target %s reentered!\n", | |
416 | t->u.kernel.target->name); | |
417 | verdict = NF_DROP; | |
418 | } | |
419 | ((struct ipt_entry *)table_base)->comefrom | |
420 | = 0x57acc001; | |
421 | #endif | |
422 | /* Target might have changed stuff. */ | |
3db05fea HX |
423 | ip = ip_hdr(skb); |
424 | datalen = skb->len - ip->ihl * 4; | |
1da177e4 LT |
425 | |
426 | if (verdict == IPT_CONTINUE) | |
427 | e = (void *)e + e->next_offset; | |
428 | else | |
429 | /* Verdict */ | |
430 | break; | |
431 | } | |
432 | } else { | |
433 | ||
434 | no_match: | |
435 | e = (void *)e + e->next_offset; | |
436 | } | |
437 | } while (!hotdrop); | |
942e4a2b | 438 | xt_info_rdunlock_bh(); |
1da177e4 LT |
439 | |
440 | #ifdef DEBUG_ALLOW_ALL | |
441 | return NF_ACCEPT; | |
442 | #else | |
443 | if (hotdrop) | |
444 | return NF_DROP; | |
445 | else return verdict; | |
446 | #endif | |
447 | } | |
448 | ||
1da177e4 LT |
449 | /* Figures out from what hook each rule can be called: returns 0 if |
450 | there are loops. Puts hook bitmask in comefrom. */ | |
451 | static int | |
2e4e6a17 | 452 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 453 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
454 | { |
455 | unsigned int hook; | |
456 | ||
457 | /* No recursion; use packet counter to save back ptrs (reset | |
458 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 459 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 460 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 461 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
462 | |
463 | if (!(valid_hooks & (1 << hook))) | |
464 | continue; | |
465 | ||
466 | /* Set initial back pointer. */ | |
467 | e->counters.pcnt = pos; | |
468 | ||
469 | for (;;) { | |
470 | struct ipt_standard_target *t | |
471 | = (void *)ipt_get_target(e); | |
e1b4b9f3 | 472 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 473 | |
6e23ae2a | 474 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
475 | printk("iptables: loop hook %u pos %u %08X.\n", |
476 | hook, pos, e->comefrom); | |
477 | return 0; | |
478 | } | |
9c547959 | 479 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
480 | |
481 | /* Unconditional return/END. */ | |
e1b4b9f3 | 482 | if ((e->target_offset == sizeof(struct ipt_entry) |
1da177e4 LT |
483 | && (strcmp(t->target.u.user.name, |
484 | IPT_STANDARD_TARGET) == 0) | |
485 | && t->verdict < 0 | |
e1b4b9f3 | 486 | && unconditional(&e->ip)) || visited) { |
1da177e4 LT |
487 | unsigned int oldpos, size; |
488 | ||
1f9352ae PM |
489 | if ((strcmp(t->target.u.user.name, |
490 | IPT_STANDARD_TARGET) == 0) && | |
491 | t->verdict < -NF_MAX_VERDICT - 1) { | |
74c9c0c1 DM |
492 | duprintf("mark_source_chains: bad " |
493 | "negative verdict (%i)\n", | |
494 | t->verdict); | |
495 | return 0; | |
496 | } | |
497 | ||
1da177e4 LT |
498 | /* Return: backtrack through the last |
499 | big jump. */ | |
500 | do { | |
6e23ae2a | 501 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
502 | #ifdef DEBUG_IP_FIREWALL_USER |
503 | if (e->comefrom | |
6e23ae2a | 504 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
505 | duprintf("Back unset " |
506 | "on hook %u " | |
507 | "rule %u\n", | |
508 | hook, pos); | |
509 | } | |
510 | #endif | |
511 | oldpos = pos; | |
512 | pos = e->counters.pcnt; | |
513 | e->counters.pcnt = 0; | |
514 | ||
515 | /* We're at the start. */ | |
516 | if (pos == oldpos) | |
517 | goto next; | |
518 | ||
519 | e = (struct ipt_entry *) | |
31836064 | 520 | (entry0 + pos); |
1da177e4 LT |
521 | } while (oldpos == pos + e->next_offset); |
522 | ||
523 | /* Move along one */ | |
524 | size = e->next_offset; | |
525 | e = (struct ipt_entry *) | |
31836064 | 526 | (entry0 + pos + size); |
1da177e4 LT |
527 | e->counters.pcnt = pos; |
528 | pos += size; | |
529 | } else { | |
530 | int newpos = t->verdict; | |
531 | ||
532 | if (strcmp(t->target.u.user.name, | |
533 | IPT_STANDARD_TARGET) == 0 | |
534 | && newpos >= 0) { | |
74c9c0c1 DM |
535 | if (newpos > newinfo->size - |
536 | sizeof(struct ipt_entry)) { | |
537 | duprintf("mark_source_chains: " | |
538 | "bad verdict (%i)\n", | |
539 | newpos); | |
540 | return 0; | |
541 | } | |
1da177e4 LT |
542 | /* This a jump; chase it. */ |
543 | duprintf("Jump rule %u -> %u\n", | |
544 | pos, newpos); | |
545 | } else { | |
546 | /* ... this is a fallthru */ | |
547 | newpos = pos + e->next_offset; | |
548 | } | |
549 | e = (struct ipt_entry *) | |
31836064 | 550 | (entry0 + newpos); |
1da177e4 LT |
551 | e->counters.pcnt = pos; |
552 | pos = newpos; | |
553 | } | |
554 | } | |
555 | next: | |
556 | duprintf("Finished chain %u\n", hook); | |
557 | } | |
558 | return 1; | |
559 | } | |
560 | ||
022748a9 | 561 | static int |
1da177e4 LT |
562 | cleanup_match(struct ipt_entry_match *m, unsigned int *i) |
563 | { | |
6be3d859 JE |
564 | struct xt_mtdtor_param par; |
565 | ||
1da177e4 LT |
566 | if (i && (*i)-- == 0) |
567 | return 1; | |
568 | ||
6be3d859 JE |
569 | par.match = m->u.kernel.match; |
570 | par.matchinfo = m->data; | |
916a917d | 571 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
572 | if (par.match->destroy != NULL) |
573 | par.match->destroy(&par); | |
574 | module_put(par.match->me); | |
1da177e4 LT |
575 | return 0; |
576 | } | |
577 | ||
022748a9 | 578 | static int |
a96be246 DM |
579 | check_entry(struct ipt_entry *e, const char *name) |
580 | { | |
581 | struct ipt_entry_target *t; | |
582 | ||
583 | if (!ip_checkentry(&e->ip)) { | |
584 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
585 | return -EINVAL; | |
586 | } | |
587 | ||
9c547959 PM |
588 | if (e->target_offset + sizeof(struct ipt_entry_target) > |
589 | e->next_offset) | |
a96be246 DM |
590 | return -EINVAL; |
591 | ||
592 | t = ipt_get_target(e); | |
593 | if (e->target_offset + t->u.target_size > e->next_offset) | |
594 | return -EINVAL; | |
595 | ||
596 | return 0; | |
597 | } | |
598 | ||
022748a9 | 599 | static int |
9b4fce7a JE |
600 | check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par, |
601 | unsigned int *i) | |
a96be246 | 602 | { |
9b4fce7a | 603 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 DM |
604 | int ret; |
605 | ||
9b4fce7a JE |
606 | par->match = m->u.kernel.match; |
607 | par->matchinfo = m->data; | |
608 | ||
916a917d | 609 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 610 | ip->proto, ip->invflags & IPT_INV_PROTO); |
367c6790 | 611 | if (ret < 0) { |
a96be246 | 612 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 613 | par.match->name); |
367c6790 | 614 | return ret; |
a96be246 | 615 | } |
367c6790 JE |
616 | ++*i; |
617 | return 0; | |
a96be246 DM |
618 | } |
619 | ||
022748a9 | 620 | static int |
9b4fce7a | 621 | find_check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par, |
4b478248 | 622 | unsigned int *i) |
1da177e4 | 623 | { |
6709dbbb | 624 | struct xt_match *match; |
3cdc7c95 | 625 | int ret; |
1da177e4 | 626 | |
2e4e6a17 | 627 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, |
9c547959 | 628 | m->u.user.revision), |
1da177e4 LT |
629 | "ipt_%s", m->u.user.name); |
630 | if (IS_ERR(match) || !match) { | |
a96be246 | 631 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
1da177e4 LT |
632 | return match ? PTR_ERR(match) : -ENOENT; |
633 | } | |
634 | m->u.kernel.match = match; | |
635 | ||
9b4fce7a | 636 | ret = check_match(m, par, i); |
3cdc7c95 PM |
637 | if (ret) |
638 | goto err; | |
639 | ||
1da177e4 | 640 | return 0; |
3cdc7c95 PM |
641 | err: |
642 | module_put(m->u.kernel.match->me); | |
643 | return ret; | |
1da177e4 LT |
644 | } |
645 | ||
022748a9 | 646 | static int check_target(struct ipt_entry *e, const char *name) |
a96be246 | 647 | { |
af5d6dc2 JE |
648 | struct ipt_entry_target *t = ipt_get_target(e); |
649 | struct xt_tgchk_param par = { | |
650 | .table = name, | |
651 | .entryinfo = e, | |
652 | .target = t->u.kernel.target, | |
653 | .targinfo = t->data, | |
654 | .hook_mask = e->comefrom, | |
916a917d | 655 | .family = NFPROTO_IPV4, |
af5d6dc2 | 656 | }; |
e905a9ed | 657 | int ret; |
a96be246 | 658 | |
916a917d | 659 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 660 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
367c6790 | 661 | if (ret < 0) { |
a96be246 DM |
662 | duprintf("ip_tables: check failed for `%s'.\n", |
663 | t->u.kernel.target->name); | |
367c6790 | 664 | return ret; |
a96be246 | 665 | } |
367c6790 | 666 | return 0; |
a96be246 | 667 | } |
1da177e4 | 668 | |
022748a9 | 669 | static int |
a96be246 | 670 | find_check_entry(struct ipt_entry *e, const char *name, unsigned int size, |
4b478248 | 671 | unsigned int *i) |
1da177e4 LT |
672 | { |
673 | struct ipt_entry_target *t; | |
6709dbbb | 674 | struct xt_target *target; |
1da177e4 LT |
675 | int ret; |
676 | unsigned int j; | |
9b4fce7a | 677 | struct xt_mtchk_param mtpar; |
1da177e4 | 678 | |
a96be246 DM |
679 | ret = check_entry(e, name); |
680 | if (ret) | |
681 | return ret; | |
590bdf7f | 682 | |
1da177e4 | 683 | j = 0; |
9b4fce7a JE |
684 | mtpar.table = name; |
685 | mtpar.entryinfo = &e->ip; | |
686 | mtpar.hook_mask = e->comefrom; | |
916a917d | 687 | mtpar.family = NFPROTO_IPV4; |
9b4fce7a | 688 | ret = IPT_MATCH_ITERATE(e, find_check_match, &mtpar, &j); |
1da177e4 LT |
689 | if (ret != 0) |
690 | goto cleanup_matches; | |
691 | ||
692 | t = ipt_get_target(e); | |
2e4e6a17 | 693 | target = try_then_request_module(xt_find_target(AF_INET, |
4b478248 PM |
694 | t->u.user.name, |
695 | t->u.user.revision), | |
1da177e4 LT |
696 | "ipt_%s", t->u.user.name); |
697 | if (IS_ERR(target) || !target) { | |
a96be246 | 698 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
1da177e4 LT |
699 | ret = target ? PTR_ERR(target) : -ENOENT; |
700 | goto cleanup_matches; | |
701 | } | |
702 | t->u.kernel.target = target; | |
703 | ||
a96be246 | 704 | ret = check_target(e, name); |
3cdc7c95 PM |
705 | if (ret) |
706 | goto err; | |
707 | ||
1da177e4 LT |
708 | (*i)++; |
709 | return 0; | |
3cdc7c95 PM |
710 | err: |
711 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
712 | cleanup_matches: |
713 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
714 | return ret; | |
715 | } | |
716 | ||
022748a9 | 717 | static int |
1da177e4 | 718 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 719 | struct xt_table_info *newinfo, |
1da177e4 LT |
720 | unsigned char *base, |
721 | unsigned char *limit, | |
722 | const unsigned int *hook_entries, | |
723 | const unsigned int *underflows, | |
724 | unsigned int *i) | |
725 | { | |
726 | unsigned int h; | |
727 | ||
728 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 | |
729 | || (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { | |
730 | duprintf("Bad offset %p\n", e); | |
731 | return -EINVAL; | |
732 | } | |
733 | ||
734 | if (e->next_offset | |
735 | < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) { | |
736 | duprintf("checking: element %p size %u\n", | |
737 | e, e->next_offset); | |
738 | return -EINVAL; | |
739 | } | |
740 | ||
741 | /* Check hooks & underflows */ | |
6e23ae2a | 742 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
1da177e4 LT |
743 | if ((unsigned char *)e - base == hook_entries[h]) |
744 | newinfo->hook_entry[h] = hook_entries[h]; | |
745 | if ((unsigned char *)e - base == underflows[h]) | |
746 | newinfo->underflow[h] = underflows[h]; | |
747 | } | |
748 | ||
749 | /* FIXME: underflows must be unconditional, standard verdicts | |
e905a9ed | 750 | < 0 (not IPT_RETURN). --RR */ |
1da177e4 LT |
751 | |
752 | /* Clear counters and comefrom */ | |
2e4e6a17 | 753 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
754 | e->comefrom = 0; |
755 | ||
756 | (*i)++; | |
757 | return 0; | |
758 | } | |
759 | ||
022748a9 | 760 | static int |
1da177e4 LT |
761 | cleanup_entry(struct ipt_entry *e, unsigned int *i) |
762 | { | |
a2df1648 | 763 | struct xt_tgdtor_param par; |
1da177e4 LT |
764 | struct ipt_entry_target *t; |
765 | ||
766 | if (i && (*i)-- == 0) | |
767 | return 1; | |
768 | ||
769 | /* Cleanup all matches */ | |
770 | IPT_MATCH_ITERATE(e, cleanup_match, NULL); | |
771 | t = ipt_get_target(e); | |
a2df1648 JE |
772 | |
773 | par.target = t->u.kernel.target; | |
774 | par.targinfo = t->data; | |
916a917d | 775 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
776 | if (par.target->destroy != NULL) |
777 | par.target->destroy(&par); | |
778 | module_put(par.target->me); | |
1da177e4 LT |
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 | |
942e4a2b SH |
897 | * with data used by 'current' CPU. |
898 | * | |
899 | * Bottom half has to be disabled to prevent deadlock | |
900 | * if new softirq were to run and call ipt_do_table | |
31836064 | 901 | */ |
942e4a2b SH |
902 | local_bh_disable(); |
903 | curcpu = smp_processor_id(); | |
31836064 ED |
904 | |
905 | i = 0; | |
906 | IPT_ENTRY_ITERATE(t->entries[curcpu], | |
907 | t->size, | |
908 | set_entry_to_counter, | |
909 | counters, | |
910 | &i); | |
1da177e4 | 911 | |
6f912042 | 912 | for_each_possible_cpu(cpu) { |
31836064 ED |
913 | if (cpu == curcpu) |
914 | continue; | |
1da177e4 | 915 | i = 0; |
942e4a2b | 916 | xt_info_wrlock(cpu); |
31836064 | 917 | IPT_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
918 | t->size, |
919 | add_entry_to_counter, | |
920 | counters, | |
921 | &i); | |
942e4a2b | 922 | xt_info_wrunlock(cpu); |
1da177e4 | 923 | } |
78454473 SH |
924 | local_bh_enable(); |
925 | } | |
926 | ||
022748a9 | 927 | static struct xt_counters * alloc_counters(struct xt_table *table) |
1da177e4 | 928 | { |
2722971c | 929 | unsigned int countersize; |
2e4e6a17 | 930 | struct xt_counters *counters; |
78454473 | 931 | struct xt_table_info *private = table->private; |
1da177e4 LT |
932 | |
933 | /* We need atomic snapshot of counters: rest doesn't change | |
934 | (other than comefrom, which userspace doesn't care | |
935 | about). */ | |
2e4e6a17 | 936 | countersize = sizeof(struct xt_counters) * private->number; |
31836064 | 937 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
938 | |
939 | if (counters == NULL) | |
942e4a2b | 940 | return ERR_PTR(-ENOMEM); |
78454473 | 941 | |
942e4a2b | 942 | get_counters(private, counters); |
1da177e4 | 943 | |
2722971c DM |
944 | return counters; |
945 | } | |
946 | ||
947 | static int | |
948 | copy_entries_to_user(unsigned int total_size, | |
e60a13e0 | 949 | struct xt_table *table, |
2722971c DM |
950 | void __user *userptr) |
951 | { | |
952 | unsigned int off, num; | |
953 | struct ipt_entry *e; | |
954 | struct xt_counters *counters; | |
5452e425 | 955 | const struct xt_table_info *private = table->private; |
2722971c | 956 | int ret = 0; |
5452e425 | 957 | const void *loc_cpu_entry; |
2722971c DM |
958 | |
959 | counters = alloc_counters(table); | |
960 | if (IS_ERR(counters)) | |
961 | return PTR_ERR(counters); | |
962 | ||
31836064 ED |
963 | /* choose the copy that is on our node/cpu, ... |
964 | * This choice is lazy (because current thread is | |
965 | * allowed to migrate to another cpu) | |
966 | */ | |
2e4e6a17 | 967 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 968 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
969 | ret = -EFAULT; |
970 | goto free_counters; | |
971 | } | |
972 | ||
973 | /* FIXME: use iterator macros --RR */ | |
974 | /* ... then go back and fix counters and names */ | |
975 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
976 | unsigned int i; | |
5452e425 JE |
977 | const struct ipt_entry_match *m; |
978 | const struct ipt_entry_target *t; | |
1da177e4 | 979 | |
31836064 | 980 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
981 | if (copy_to_user(userptr + off |
982 | + offsetof(struct ipt_entry, counters), | |
983 | &counters[num], | |
984 | sizeof(counters[num])) != 0) { | |
985 | ret = -EFAULT; | |
986 | goto free_counters; | |
987 | } | |
988 | ||
989 | for (i = sizeof(struct ipt_entry); | |
990 | i < e->target_offset; | |
991 | i += m->u.match_size) { | |
992 | m = (void *)e + i; | |
993 | ||
994 | if (copy_to_user(userptr + off + i | |
995 | + offsetof(struct ipt_entry_match, | |
996 | u.user.name), | |
997 | m->u.kernel.match->name, | |
998 | strlen(m->u.kernel.match->name)+1) | |
999 | != 0) { | |
1000 | ret = -EFAULT; | |
1001 | goto free_counters; | |
1002 | } | |
1003 | } | |
1004 | ||
1005 | t = ipt_get_target(e); | |
1006 | if (copy_to_user(userptr + off + e->target_offset | |
1007 | + offsetof(struct ipt_entry_target, | |
1008 | u.user.name), | |
1009 | t->u.kernel.target->name, | |
1010 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1011 | ret = -EFAULT; | |
1012 | goto free_counters; | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | free_counters: | |
1017 | vfree(counters); | |
1018 | return ret; | |
1019 | } | |
1020 | ||
2722971c | 1021 | #ifdef CONFIG_COMPAT |
9fa492cd | 1022 | static void compat_standard_from_user(void *dst, void *src) |
2722971c | 1023 | { |
9fa492cd | 1024 | int v = *(compat_int_t *)src; |
2722971c | 1025 | |
9fa492cd | 1026 | if (v > 0) |
b386d9f5 | 1027 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1028 | memcpy(dst, &v, sizeof(v)); |
1029 | } | |
46c5ea3c | 1030 | |
9fa492cd | 1031 | static int compat_standard_to_user(void __user *dst, void *src) |
2722971c | 1032 | { |
9fa492cd | 1033 | compat_int_t cv = *(int *)src; |
2722971c | 1034 | |
9fa492cd | 1035 | if (cv > 0) |
b386d9f5 | 1036 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1037 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1038 | } |
1039 | ||
1040 | static inline int | |
4b478248 | 1041 | compat_calc_match(struct ipt_entry_match *m, int *size) |
2722971c | 1042 | { |
9fa492cd | 1043 | *size += xt_compat_match_offset(m->u.kernel.match); |
2722971c DM |
1044 | return 0; |
1045 | } | |
1046 | ||
259d4e41 | 1047 | static int compat_calc_entry(struct ipt_entry *e, |
4b478248 PM |
1048 | const struct xt_table_info *info, |
1049 | void *base, struct xt_table_info *newinfo) | |
2722971c DM |
1050 | { |
1051 | struct ipt_entry_target *t; | |
e5b5ef7d | 1052 | unsigned int entry_offset; |
2722971c DM |
1053 | int off, i, ret; |
1054 | ||
30c08c41 | 1055 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1056 | entry_offset = (void *)e - base; |
1057 | IPT_MATCH_ITERATE(e, compat_calc_match, &off); | |
1058 | t = ipt_get_target(e); | |
9fa492cd | 1059 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1060 | newinfo->size -= off; |
b386d9f5 | 1061 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1062 | if (ret) |
1063 | return ret; | |
1064 | ||
6e23ae2a | 1065 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1066 | if (info->hook_entry[i] && |
1067 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1068 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1069 | if (info->underflow[i] && |
1070 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1071 | newinfo->underflow[i] -= off; |
1072 | } | |
1073 | return 0; | |
1074 | } | |
1075 | ||
259d4e41 | 1076 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1077 | struct xt_table_info *newinfo) |
2722971c DM |
1078 | { |
1079 | void *loc_cpu_entry; | |
2722971c DM |
1080 | |
1081 | if (!newinfo || !info) | |
1082 | return -EINVAL; | |
1083 | ||
259d4e41 ED |
1084 | /* we dont care about newinfo->entries[] */ |
1085 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1086 | newinfo->initial_entries = 0; | |
2722971c DM |
1087 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
1088 | return IPT_ENTRY_ITERATE(loc_cpu_entry, info->size, | |
4b478248 PM |
1089 | compat_calc_entry, info, loc_cpu_entry, |
1090 | newinfo); | |
2722971c DM |
1091 | } |
1092 | #endif | |
1093 | ||
34bd137b | 1094 | static int get_info(struct net *net, void __user *user, int *len, int compat) |
2722971c DM |
1095 | { |
1096 | char name[IPT_TABLE_MAXNAMELEN]; | |
e60a13e0 | 1097 | struct xt_table *t; |
2722971c DM |
1098 | int ret; |
1099 | ||
1100 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1101 | duprintf("length %u != %zu\n", *len, |
1102 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1103 | return -EINVAL; |
1104 | } | |
1105 | ||
1106 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1107 | return -EFAULT; | |
1108 | ||
1109 | name[IPT_TABLE_MAXNAMELEN-1] = '\0'; | |
1110 | #ifdef CONFIG_COMPAT | |
1111 | if (compat) | |
1112 | xt_compat_lock(AF_INET); | |
1113 | #endif | |
34bd137b | 1114 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1115 | "iptable_%s", name); |
2722971c DM |
1116 | if (t && !IS_ERR(t)) { |
1117 | struct ipt_getinfo info; | |
5452e425 | 1118 | const struct xt_table_info *private = t->private; |
2722971c DM |
1119 | |
1120 | #ifdef CONFIG_COMPAT | |
1121 | if (compat) { | |
1122 | struct xt_table_info tmp; | |
1123 | ret = compat_table_info(private, &tmp); | |
b386d9f5 | 1124 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1125 | private = &tmp; |
2722971c DM |
1126 | } |
1127 | #endif | |
1128 | info.valid_hooks = t->valid_hooks; | |
1129 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1130 | sizeof(info.hook_entry)); |
2722971c | 1131 | memcpy(info.underflow, private->underflow, |
4b478248 | 1132 | sizeof(info.underflow)); |
2722971c DM |
1133 | info.num_entries = private->number; |
1134 | info.size = private->size; | |
1135 | strcpy(info.name, name); | |
1136 | ||
1137 | if (copy_to_user(user, &info, *len) != 0) | |
1138 | ret = -EFAULT; | |
1139 | else | |
1140 | ret = 0; | |
1141 | ||
1142 | xt_table_unlock(t); | |
1143 | module_put(t->me); | |
1144 | } else | |
1145 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1146 | #ifdef CONFIG_COMPAT | |
1147 | if (compat) | |
1148 | xt_compat_unlock(AF_INET); | |
1149 | #endif | |
1150 | return ret; | |
1151 | } | |
1152 | ||
1153 | static int | |
34bd137b | 1154 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, int *len) |
2722971c DM |
1155 | { |
1156 | int ret; | |
1157 | struct ipt_get_entries get; | |
e60a13e0 | 1158 | struct xt_table *t; |
2722971c DM |
1159 | |
1160 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1161 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1162 | return -EINVAL; |
1163 | } | |
1164 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1165 | return -EFAULT; | |
1166 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1167 | duprintf("get_entries: %u != %zu\n", |
1168 | *len, sizeof(get) + get.size); | |
2722971c DM |
1169 | return -EINVAL; |
1170 | } | |
1171 | ||
34bd137b | 1172 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1173 | if (t && !IS_ERR(t)) { |
5452e425 | 1174 | const struct xt_table_info *private = t->private; |
9c547959 | 1175 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1176 | if (get.size == private->size) |
1177 | ret = copy_entries_to_user(private->size, | |
1178 | t, uptr->entrytable); | |
1179 | else { | |
1180 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1181 | private->size, get.size); |
544473c1 | 1182 | ret = -EAGAIN; |
2722971c DM |
1183 | } |
1184 | module_put(t->me); | |
1185 | xt_table_unlock(t); | |
1186 | } else | |
1187 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1188 | ||
1189 | return ret; | |
1190 | } | |
1191 | ||
1192 | static int | |
34bd137b | 1193 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1194 | struct xt_table_info *newinfo, unsigned int num_counters, |
1195 | void __user *counters_ptr) | |
2722971c DM |
1196 | { |
1197 | int ret; | |
e60a13e0 | 1198 | struct xt_table *t; |
2722971c DM |
1199 | struct xt_table_info *oldinfo; |
1200 | struct xt_counters *counters; | |
1201 | void *loc_cpu_old_entry; | |
1202 | ||
1203 | ret = 0; | |
1204 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); | |
1205 | if (!counters) { | |
1206 | ret = -ENOMEM; | |
1207 | goto out; | |
1208 | } | |
1209 | ||
34bd137b | 1210 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c DM |
1211 | "iptable_%s", name); |
1212 | if (!t || IS_ERR(t)) { | |
1213 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1214 | goto free_newinfo_counters_untrans; | |
1215 | } | |
1216 | ||
1217 | /* You lied! */ | |
1218 | if (valid_hooks != t->valid_hooks) { | |
1219 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1220 | valid_hooks, t->valid_hooks); | |
1221 | ret = -EINVAL; | |
1222 | goto put_module; | |
1223 | } | |
1224 | ||
1225 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1226 | if (!oldinfo) | |
1227 | goto put_module; | |
1228 | ||
1229 | /* Update module usage count based on number of rules */ | |
1230 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1231 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1232 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1233 | (newinfo->number <= oldinfo->initial_entries)) | |
1234 | module_put(t->me); | |
1235 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1236 | (newinfo->number <= oldinfo->initial_entries)) | |
1237 | module_put(t->me); | |
1238 | ||
942e4a2b | 1239 | /* Get the old counters, and synchronize with replace */ |
2722971c | 1240 | get_counters(oldinfo, counters); |
942e4a2b | 1241 | |
2722971c DM |
1242 | /* Decrease module usage counts and free resource */ |
1243 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
4b478248 PM |
1244 | IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry, |
1245 | NULL); | |
2722971c DM |
1246 | xt_free_table_info(oldinfo); |
1247 | if (copy_to_user(counters_ptr, counters, | |
1248 | sizeof(struct xt_counters) * num_counters) != 0) | |
1249 | ret = -EFAULT; | |
1250 | vfree(counters); | |
1251 | xt_table_unlock(t); | |
1252 | return ret; | |
1253 | ||
1254 | put_module: | |
1255 | module_put(t->me); | |
1256 | xt_table_unlock(t); | |
1257 | free_newinfo_counters_untrans: | |
1258 | vfree(counters); | |
1259 | out: | |
1260 | return ret; | |
1261 | } | |
1262 | ||
1263 | static int | |
34bd137b | 1264 | do_replace(struct net *net, void __user *user, unsigned int len) |
2722971c DM |
1265 | { |
1266 | int ret; | |
1267 | struct ipt_replace tmp; | |
1268 | struct xt_table_info *newinfo; | |
1269 | void *loc_cpu_entry; | |
1270 | ||
1271 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1272 | return -EFAULT; | |
1273 | ||
2722971c | 1274 | /* overflow check */ |
2722971c DM |
1275 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1276 | return -ENOMEM; | |
1277 | ||
1278 | newinfo = xt_alloc_table_info(tmp.size); | |
1279 | if (!newinfo) | |
1280 | return -ENOMEM; | |
1281 | ||
9c547959 | 1282 | /* choose the copy that is on our node/cpu */ |
2722971c DM |
1283 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1284 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1285 | tmp.size) != 0) { | |
1286 | ret = -EFAULT; | |
1287 | goto free_newinfo; | |
1288 | } | |
1289 | ||
1290 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
1291 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, | |
1292 | tmp.hook_entry, tmp.underflow); | |
1293 | if (ret != 0) | |
1294 | goto free_newinfo; | |
1295 | ||
1296 | duprintf("ip_tables: Translated table\n"); | |
1297 | ||
34bd137b | 1298 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1299 | tmp.num_counters, tmp.counters); |
2722971c DM |
1300 | if (ret) |
1301 | goto free_newinfo_untrans; | |
1302 | return 0; | |
1303 | ||
1304 | free_newinfo_untrans: | |
9c547959 | 1305 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
2722971c DM |
1306 | free_newinfo: |
1307 | xt_free_table_info(newinfo); | |
1308 | return ret; | |
1309 | } | |
1310 | ||
942e4a2b SH |
1311 | /* We're lazy, and add to the first CPU; overflow works its fey magic |
1312 | * and everything is OK. */ | |
1313 | static int | |
1314 | add_counter_to_entry(struct ipt_entry *e, | |
1315 | const struct xt_counters addme[], | |
1316 | unsigned int *i) | |
1317 | { | |
1318 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1319 | ||
1320 | (*i)++; | |
1321 | return 0; | |
1322 | } | |
2722971c DM |
1323 | |
1324 | static int | |
34bd137b | 1325 | do_add_counters(struct net *net, void __user *user, unsigned int len, int compat) |
2722971c | 1326 | { |
942e4a2b | 1327 | unsigned int i, curcpu; |
2722971c DM |
1328 | struct xt_counters_info tmp; |
1329 | struct xt_counters *paddc; | |
1330 | unsigned int num_counters; | |
5452e425 | 1331 | const char *name; |
2722971c DM |
1332 | int size; |
1333 | void *ptmp; | |
e60a13e0 | 1334 | struct xt_table *t; |
5452e425 | 1335 | const struct xt_table_info *private; |
2722971c DM |
1336 | int ret = 0; |
1337 | void *loc_cpu_entry; | |
1338 | #ifdef CONFIG_COMPAT | |
1339 | struct compat_xt_counters_info compat_tmp; | |
1340 | ||
1341 | if (compat) { | |
1342 | ptmp = &compat_tmp; | |
1343 | size = sizeof(struct compat_xt_counters_info); | |
1344 | } else | |
1345 | #endif | |
1346 | { | |
1347 | ptmp = &tmp; | |
1348 | size = sizeof(struct xt_counters_info); | |
1349 | } | |
1350 | ||
1351 | if (copy_from_user(ptmp, user, size) != 0) | |
1352 | return -EFAULT; | |
1353 | ||
1354 | #ifdef CONFIG_COMPAT | |
1355 | if (compat) { | |
1356 | num_counters = compat_tmp.num_counters; | |
1357 | name = compat_tmp.name; | |
1358 | } else | |
1359 | #endif | |
1360 | { | |
1361 | num_counters = tmp.num_counters; | |
1362 | name = tmp.name; | |
1363 | } | |
1364 | ||
1365 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1366 | return -EINVAL; | |
1367 | ||
1368 | paddc = vmalloc_node(len - size, numa_node_id()); | |
1369 | if (!paddc) | |
1370 | return -ENOMEM; | |
1371 | ||
1372 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1373 | ret = -EFAULT; | |
1374 | goto free; | |
1375 | } | |
1376 | ||
34bd137b | 1377 | t = xt_find_table_lock(net, AF_INET, name); |
2722971c DM |
1378 | if (!t || IS_ERR(t)) { |
1379 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1380 | goto free; | |
1381 | } | |
1382 | ||
942e4a2b | 1383 | local_bh_disable(); |
2722971c DM |
1384 | private = t->private; |
1385 | if (private->number != num_counters) { | |
1386 | ret = -EINVAL; | |
1387 | goto unlock_up_free; | |
1388 | } | |
1389 | ||
1390 | i = 0; | |
1391 | /* Choose the copy that is on our node */ | |
942e4a2b SH |
1392 | curcpu = smp_processor_id(); |
1393 | loc_cpu_entry = private->entries[curcpu]; | |
1394 | xt_info_wrlock(curcpu); | |
2722971c DM |
1395 | IPT_ENTRY_ITERATE(loc_cpu_entry, |
1396 | private->size, | |
1397 | add_counter_to_entry, | |
1398 | paddc, | |
1399 | &i); | |
942e4a2b | 1400 | xt_info_wrunlock(curcpu); |
2722971c | 1401 | unlock_up_free: |
942e4a2b | 1402 | local_bh_enable(); |
2722971c DM |
1403 | xt_table_unlock(t); |
1404 | module_put(t->me); | |
1405 | free: | |
1406 | vfree(paddc); | |
1407 | ||
1408 | return ret; | |
1409 | } | |
1410 | ||
1411 | #ifdef CONFIG_COMPAT | |
1412 | struct compat_ipt_replace { | |
1413 | char name[IPT_TABLE_MAXNAMELEN]; | |
1414 | u32 valid_hooks; | |
1415 | u32 num_entries; | |
1416 | u32 size; | |
6e23ae2a PM |
1417 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1418 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c DM |
1419 | u32 num_counters; |
1420 | compat_uptr_t counters; /* struct ipt_counters * */ | |
1421 | struct compat_ipt_entry entries[0]; | |
1422 | }; | |
1423 | ||
a18aa31b PM |
1424 | static int |
1425 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1426 | unsigned int *size, struct xt_counters *counters, |
a18aa31b | 1427 | unsigned int *i) |
2722971c | 1428 | { |
3e597c60 | 1429 | struct ipt_entry_target *t; |
2722971c DM |
1430 | struct compat_ipt_entry __user *ce; |
1431 | u_int16_t target_offset, next_offset; | |
1432 | compat_uint_t origsize; | |
1433 | int ret; | |
1434 | ||
1435 | ret = -EFAULT; | |
1436 | origsize = *size; | |
1437 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
7800007c | 1438 | if (copy_to_user(ce, e, sizeof(struct ipt_entry))) |
2722971c DM |
1439 | goto out; |
1440 | ||
a18aa31b PM |
1441 | if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i]))) |
1442 | goto out; | |
1443 | ||
2722971c | 1444 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1445 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1446 | ||
ac8e27fd | 1447 | ret = IPT_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size); |
2722971c DM |
1448 | target_offset = e->target_offset - (origsize - *size); |
1449 | if (ret) | |
1450 | goto out; | |
1451 | t = ipt_get_target(e); | |
9fa492cd | 1452 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c DM |
1453 | if (ret) |
1454 | goto out; | |
1455 | ret = -EFAULT; | |
1456 | next_offset = e->next_offset - (origsize - *size); | |
7800007c | 1457 | if (put_user(target_offset, &ce->target_offset)) |
2722971c | 1458 | goto out; |
7800007c | 1459 | if (put_user(next_offset, &ce->next_offset)) |
2722971c | 1460 | goto out; |
a18aa31b PM |
1461 | |
1462 | (*i)++; | |
2722971c DM |
1463 | return 0; |
1464 | out: | |
1465 | return ret; | |
1466 | } | |
1467 | ||
022748a9 | 1468 | static int |
4c1b52bc | 1469 | compat_find_calc_match(struct ipt_entry_match *m, |
4b478248 PM |
1470 | const char *name, |
1471 | const struct ipt_ip *ip, | |
1472 | unsigned int hookmask, | |
b0a6363c | 1473 | int *size, unsigned int *i) |
2722971c | 1474 | { |
6709dbbb | 1475 | struct xt_match *match; |
2722971c DM |
1476 | |
1477 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, | |
4b478248 | 1478 | m->u.user.revision), |
2722971c DM |
1479 | "ipt_%s", m->u.user.name); |
1480 | if (IS_ERR(match) || !match) { | |
1481 | duprintf("compat_check_calc_match: `%s' not found\n", | |
4b478248 | 1482 | m->u.user.name); |
2722971c DM |
1483 | return match ? PTR_ERR(match) : -ENOENT; |
1484 | } | |
1485 | m->u.kernel.match = match; | |
9fa492cd | 1486 | *size += xt_compat_match_offset(match); |
2722971c DM |
1487 | |
1488 | (*i)++; | |
1489 | return 0; | |
1490 | } | |
1491 | ||
022748a9 | 1492 | static int |
4c1b52bc DM |
1493 | compat_release_match(struct ipt_entry_match *m, unsigned int *i) |
1494 | { | |
1495 | if (i && (*i)-- == 0) | |
1496 | return 1; | |
1497 | ||
1498 | module_put(m->u.kernel.match->me); | |
1499 | return 0; | |
1500 | } | |
1501 | ||
022748a9 | 1502 | static int |
73cd598d | 1503 | compat_release_entry(struct compat_ipt_entry *e, unsigned int *i) |
4c1b52bc DM |
1504 | { |
1505 | struct ipt_entry_target *t; | |
1506 | ||
1507 | if (i && (*i)-- == 0) | |
1508 | return 1; | |
1509 | ||
1510 | /* Cleanup all matches */ | |
73cd598d PM |
1511 | COMPAT_IPT_MATCH_ITERATE(e, compat_release_match, NULL); |
1512 | t = compat_ipt_get_target(e); | |
4c1b52bc DM |
1513 | module_put(t->u.kernel.target->me); |
1514 | return 0; | |
1515 | } | |
1516 | ||
022748a9 | 1517 | static int |
73cd598d | 1518 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1519 | struct xt_table_info *newinfo, |
1520 | unsigned int *size, | |
1521 | unsigned char *base, | |
1522 | unsigned char *limit, | |
1523 | unsigned int *hook_entries, | |
1524 | unsigned int *underflows, | |
1525 | unsigned int *i, | |
1526 | const char *name) | |
2722971c DM |
1527 | { |
1528 | struct ipt_entry_target *t; | |
6709dbbb | 1529 | struct xt_target *target; |
e5b5ef7d | 1530 | unsigned int entry_offset; |
b0a6363c PM |
1531 | unsigned int j; |
1532 | int ret, off, h; | |
2722971c DM |
1533 | |
1534 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
1535 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 | |
1536 | || (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { | |
1537 | duprintf("Bad offset %p, limit = %p\n", e, limit); | |
1538 | return -EINVAL; | |
1539 | } | |
1540 | ||
1541 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1542 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1543 | duprintf("checking: element %p size %u\n", |
1544 | e, e->next_offset); | |
1545 | return -EINVAL; | |
1546 | } | |
1547 | ||
73cd598d PM |
1548 | /* For purposes of check_entry casting the compat entry is fine */ |
1549 | ret = check_entry((struct ipt_entry *)e, name); | |
a96be246 DM |
1550 | if (ret) |
1551 | return ret; | |
590bdf7f | 1552 | |
30c08c41 | 1553 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1554 | entry_offset = (void *)e - (void *)base; |
1555 | j = 0; | |
73cd598d PM |
1556 | ret = COMPAT_IPT_MATCH_ITERATE(e, compat_find_calc_match, name, |
1557 | &e->ip, e->comefrom, &off, &j); | |
2722971c | 1558 | if (ret != 0) |
4c1b52bc | 1559 | goto release_matches; |
2722971c | 1560 | |
73cd598d | 1561 | t = compat_ipt_get_target(e); |
2722971c | 1562 | target = try_then_request_module(xt_find_target(AF_INET, |
4b478248 PM |
1563 | t->u.user.name, |
1564 | t->u.user.revision), | |
2722971c DM |
1565 | "ipt_%s", t->u.user.name); |
1566 | if (IS_ERR(target) || !target) { | |
a96be246 | 1567 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1568 | t->u.user.name); |
2722971c | 1569 | ret = target ? PTR_ERR(target) : -ENOENT; |
4c1b52bc | 1570 | goto release_matches; |
2722971c DM |
1571 | } |
1572 | t->u.kernel.target = target; | |
1573 | ||
9fa492cd | 1574 | off += xt_compat_target_offset(target); |
2722971c | 1575 | *size += off; |
b386d9f5 | 1576 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1577 | if (ret) |
1578 | goto out; | |
1579 | ||
1580 | /* Check hooks & underflows */ | |
6e23ae2a | 1581 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1582 | if ((unsigned char *)e - base == hook_entries[h]) |
1583 | newinfo->hook_entry[h] = hook_entries[h]; | |
1584 | if ((unsigned char *)e - base == underflows[h]) | |
1585 | newinfo->underflow[h] = underflows[h]; | |
1586 | } | |
1587 | ||
1588 | /* Clear counters and comefrom */ | |
73cd598d | 1589 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c DM |
1590 | e->comefrom = 0; |
1591 | ||
1592 | (*i)++; | |
1593 | return 0; | |
bec71b16 | 1594 | |
2722971c | 1595 | out: |
bec71b16 | 1596 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1597 | release_matches: |
1598 | IPT_MATCH_ITERATE(e, compat_release_match, &j); | |
2722971c DM |
1599 | return ret; |
1600 | } | |
1601 | ||
4b478248 | 1602 | static int |
73cd598d | 1603 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1604 | unsigned int *size, const char *name, |
1605 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c DM |
1606 | { |
1607 | struct ipt_entry_target *t; | |
6709dbbb | 1608 | struct xt_target *target; |
2722971c DM |
1609 | struct ipt_entry *de; |
1610 | unsigned int origsize; | |
920b868a | 1611 | int ret, h; |
2722971c DM |
1612 | |
1613 | ret = 0; | |
1614 | origsize = *size; | |
1615 | de = (struct ipt_entry *)*dstptr; | |
1616 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1617 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1618 | |
73cd598d | 1619 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1620 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1621 | ||
73cd598d PM |
1622 | ret = COMPAT_IPT_MATCH_ITERATE(e, xt_compat_match_from_user, |
1623 | dstptr, size); | |
2722971c | 1624 | if (ret) |
f6677f43 | 1625 | return ret; |
2722971c | 1626 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1627 | t = compat_ipt_get_target(e); |
2722971c | 1628 | target = t->u.kernel.target; |
9fa492cd | 1629 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1630 | |
1631 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1632 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1633 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1634 | newinfo->hook_entry[h] -= origsize - *size; | |
1635 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1636 | newinfo->underflow[h] -= origsize - *size; | |
1637 | } | |
f6677f43 DM |
1638 | return ret; |
1639 | } | |
1640 | ||
022748a9 DV |
1641 | static int |
1642 | compat_check_entry(struct ipt_entry *e, const char *name, | |
4b478248 | 1643 | unsigned int *i) |
f6677f43 | 1644 | { |
9b4fce7a | 1645 | struct xt_mtchk_param mtpar; |
b0a6363c PM |
1646 | unsigned int j; |
1647 | int ret; | |
f6677f43 | 1648 | |
4c1b52bc | 1649 | j = 0; |
9b4fce7a JE |
1650 | mtpar.table = name; |
1651 | mtpar.entryinfo = &e->ip; | |
1652 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1653 | mtpar.family = NFPROTO_IPV4; |
9b4fce7a | 1654 | ret = IPT_MATCH_ITERATE(e, check_match, &mtpar, &j); |
f6677f43 | 1655 | if (ret) |
4c1b52bc DM |
1656 | goto cleanup_matches; |
1657 | ||
1658 | ret = check_target(e, name); | |
1659 | if (ret) | |
1660 | goto cleanup_matches; | |
f6677f43 | 1661 | |
4c1b52bc DM |
1662 | (*i)++; |
1663 | return 0; | |
1664 | ||
1665 | cleanup_matches: | |
1666 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
1667 | return ret; | |
f6677f43 DM |
1668 | } |
1669 | ||
1da177e4 | 1670 | static int |
2722971c | 1671 | translate_compat_table(const char *name, |
4b478248 PM |
1672 | unsigned int valid_hooks, |
1673 | struct xt_table_info **pinfo, | |
1674 | void **pentry0, | |
1675 | unsigned int total_size, | |
1676 | unsigned int number, | |
1677 | unsigned int *hook_entries, | |
1678 | unsigned int *underflows) | |
1da177e4 | 1679 | { |
920b868a | 1680 | unsigned int i, j; |
2722971c DM |
1681 | struct xt_table_info *newinfo, *info; |
1682 | void *pos, *entry0, *entry1; | |
1683 | unsigned int size; | |
1da177e4 | 1684 | int ret; |
1da177e4 | 1685 | |
2722971c DM |
1686 | info = *pinfo; |
1687 | entry0 = *pentry0; | |
1688 | size = total_size; | |
1689 | info->number = number; | |
1690 | ||
1691 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1692 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1693 | info->hook_entry[i] = 0xFFFFFFFF; |
1694 | info->underflow[i] = 0xFFFFFFFF; | |
1695 | } | |
1696 | ||
1697 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1698 | j = 0; |
2722971c DM |
1699 | xt_compat_lock(AF_INET); |
1700 | /* Walk through entries, checking offsets. */ | |
73cd598d PM |
1701 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
1702 | check_compat_entry_size_and_hooks, | |
1703 | info, &size, entry0, | |
1704 | entry0 + total_size, | |
1705 | hook_entries, underflows, &j, name); | |
2722971c DM |
1706 | if (ret != 0) |
1707 | goto out_unlock; | |
1708 | ||
1709 | ret = -EINVAL; | |
920b868a | 1710 | if (j != number) { |
2722971c | 1711 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1712 | j, number); |
2722971c DM |
1713 | goto out_unlock; |
1714 | } | |
1715 | ||
1716 | /* Check hooks all assigned */ | |
6e23ae2a | 1717 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1718 | /* Only hooks which are valid */ |
1719 | if (!(valid_hooks & (1 << i))) | |
1720 | continue; | |
1721 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1722 | duprintf("Invalid hook entry %u %u\n", | |
1723 | i, hook_entries[i]); | |
1724 | goto out_unlock; | |
1da177e4 | 1725 | } |
2722971c DM |
1726 | if (info->underflow[i] == 0xFFFFFFFF) { |
1727 | duprintf("Invalid underflow %u %u\n", | |
1728 | i, underflows[i]); | |
1729 | goto out_unlock; | |
1730 | } | |
1731 | } | |
1732 | ||
1733 | ret = -ENOMEM; | |
1734 | newinfo = xt_alloc_table_info(size); | |
1735 | if (!newinfo) | |
1736 | goto out_unlock; | |
1737 | ||
1738 | newinfo->number = number; | |
6e23ae2a | 1739 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1740 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1741 | newinfo->underflow[i] = info->underflow[i]; | |
1742 | } | |
1743 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1744 | pos = entry1; | |
4b478248 | 1745 | size = total_size; |
73cd598d | 1746 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
9c547959 PM |
1747 | compat_copy_entry_from_user, |
1748 | &pos, &size, name, newinfo, entry1); | |
b386d9f5 | 1749 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1750 | xt_compat_unlock(AF_INET); |
1751 | if (ret) | |
1752 | goto free_newinfo; | |
1753 | ||
1754 | ret = -ELOOP; | |
1755 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1756 | goto free_newinfo; | |
1757 | ||
4c1b52bc | 1758 | i = 0; |
f6677f43 | 1759 | ret = IPT_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry, |
4b478248 | 1760 | name, &i); |
4c1b52bc DM |
1761 | if (ret) { |
1762 | j -= i; | |
73cd598d PM |
1763 | COMPAT_IPT_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i, |
1764 | compat_release_entry, &j); | |
4c1b52bc DM |
1765 | IPT_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i); |
1766 | xt_free_table_info(newinfo); | |
1767 | return ret; | |
1768 | } | |
f6677f43 | 1769 | |
2722971c | 1770 | /* And one copy for every other CPU */ |
fb1bb34d | 1771 | for_each_possible_cpu(i) |
2722971c DM |
1772 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1773 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1774 | ||
1775 | *pinfo = newinfo; | |
1776 | *pentry0 = entry1; | |
1777 | xt_free_table_info(info); | |
1778 | return 0; | |
1da177e4 | 1779 | |
2722971c DM |
1780 | free_newinfo: |
1781 | xt_free_table_info(newinfo); | |
1782 | out: | |
73cd598d | 1783 | COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j); |
1da177e4 | 1784 | return ret; |
2722971c | 1785 | out_unlock: |
b386d9f5 | 1786 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1787 | xt_compat_unlock(AF_INET); |
1788 | goto out; | |
1da177e4 LT |
1789 | } |
1790 | ||
1791 | static int | |
34bd137b | 1792 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1793 | { |
1794 | int ret; | |
2722971c DM |
1795 | struct compat_ipt_replace tmp; |
1796 | struct xt_table_info *newinfo; | |
1797 | void *loc_cpu_entry; | |
1da177e4 LT |
1798 | |
1799 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1800 | return -EFAULT; | |
1801 | ||
ee4bb818 | 1802 | /* overflow check */ |
259d4e41 | 1803 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1804 | return -ENOMEM; |
1805 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1806 | return -ENOMEM; | |
1807 | ||
2e4e6a17 | 1808 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1809 | if (!newinfo) |
1810 | return -ENOMEM; | |
1811 | ||
9c547959 | 1812 | /* choose the copy that is on our node/cpu */ |
31836064 ED |
1813 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1814 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1815 | tmp.size) != 0) { |
1816 | ret = -EFAULT; | |
1817 | goto free_newinfo; | |
1818 | } | |
1819 | ||
2722971c | 1820 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, |
4b478248 PM |
1821 | &newinfo, &loc_cpu_entry, tmp.size, |
1822 | tmp.num_entries, tmp.hook_entry, | |
1823 | tmp.underflow); | |
2722971c | 1824 | if (ret != 0) |
1da177e4 | 1825 | goto free_newinfo; |
1da177e4 | 1826 | |
2722971c | 1827 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1828 | |
34bd137b | 1829 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1830 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1831 | if (ret) |
1832 | goto free_newinfo_untrans; | |
1833 | return 0; | |
1da177e4 | 1834 | |
2722971c | 1835 | free_newinfo_untrans: |
4b478248 | 1836 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
2722971c DM |
1837 | free_newinfo: |
1838 | xt_free_table_info(newinfo); | |
1839 | return ret; | |
1840 | } | |
1da177e4 | 1841 | |
2722971c DM |
1842 | static int |
1843 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1844 | unsigned int len) |
2722971c DM |
1845 | { |
1846 | int ret; | |
1da177e4 | 1847 | |
2722971c DM |
1848 | if (!capable(CAP_NET_ADMIN)) |
1849 | return -EPERM; | |
1da177e4 | 1850 | |
2722971c DM |
1851 | switch (cmd) { |
1852 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1853 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1854 | break; |
1da177e4 | 1855 | |
2722971c | 1856 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1857 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1858 | break; |
1859 | ||
1860 | default: | |
1861 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1862 | ret = -EINVAL; | |
1863 | } | |
1da177e4 | 1864 | |
1da177e4 LT |
1865 | return ret; |
1866 | } | |
1867 | ||
4b478248 | 1868 | struct compat_ipt_get_entries { |
2722971c DM |
1869 | char name[IPT_TABLE_MAXNAMELEN]; |
1870 | compat_uint_t size; | |
1871 | struct compat_ipt_entry entrytable[0]; | |
1872 | }; | |
1da177e4 | 1873 | |
4b478248 PM |
1874 | static int |
1875 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1876 | void __user *userptr) | |
2722971c | 1877 | { |
2722971c | 1878 | struct xt_counters *counters; |
5452e425 | 1879 | const struct xt_table_info *private = table->private; |
2722971c DM |
1880 | void __user *pos; |
1881 | unsigned int size; | |
1882 | int ret = 0; | |
5452e425 | 1883 | const void *loc_cpu_entry; |
a18aa31b | 1884 | unsigned int i = 0; |
1da177e4 | 1885 | |
2722971c DM |
1886 | counters = alloc_counters(table); |
1887 | if (IS_ERR(counters)) | |
1888 | return PTR_ERR(counters); | |
1889 | ||
1890 | /* choose the copy that is on our node/cpu, ... | |
1891 | * This choice is lazy (because current thread is | |
1892 | * allowed to migrate to another cpu) | |
1893 | */ | |
1894 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1895 | pos = userptr; | |
1896 | size = total_size; | |
1897 | ret = IPT_ENTRY_ITERATE(loc_cpu_entry, total_size, | |
a18aa31b PM |
1898 | compat_copy_entry_to_user, |
1899 | &pos, &size, counters, &i); | |
2722971c | 1900 | |
2722971c DM |
1901 | vfree(counters); |
1902 | return ret; | |
1da177e4 LT |
1903 | } |
1904 | ||
1905 | static int | |
34bd137b AD |
1906 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1907 | int *len) | |
1da177e4 | 1908 | { |
2722971c DM |
1909 | int ret; |
1910 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1911 | struct xt_table *t; |
1da177e4 | 1912 | |
2722971c | 1913 | if (*len < sizeof(get)) { |
c9d8fe13 | 1914 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1915 | return -EINVAL; |
2722971c | 1916 | } |
1da177e4 | 1917 | |
2722971c DM |
1918 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1919 | return -EFAULT; | |
1da177e4 | 1920 | |
2722971c | 1921 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1922 | duprintf("compat_get_entries: %u != %zu\n", |
1923 | *len, sizeof(get) + get.size); | |
2722971c | 1924 | return -EINVAL; |
1da177e4 LT |
1925 | } |
1926 | ||
2722971c | 1927 | xt_compat_lock(AF_INET); |
34bd137b | 1928 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1929 | if (t && !IS_ERR(t)) { |
5452e425 | 1930 | const struct xt_table_info *private = t->private; |
2722971c | 1931 | struct xt_table_info info; |
9c547959 | 1932 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1933 | ret = compat_table_info(private, &info); |
1934 | if (!ret && get.size == info.size) { | |
1935 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 1936 | t, uptr->entrytable); |
2722971c DM |
1937 | } else if (!ret) { |
1938 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1939 | private->size, get.size); |
544473c1 | 1940 | ret = -EAGAIN; |
2722971c | 1941 | } |
b386d9f5 | 1942 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1943 | module_put(t->me); |
1944 | xt_table_unlock(t); | |
1945 | } else | |
1da177e4 | 1946 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1947 | |
2722971c DM |
1948 | xt_compat_unlock(AF_INET); |
1949 | return ret; | |
1950 | } | |
1da177e4 | 1951 | |
79030ed0 PM |
1952 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1953 | ||
2722971c DM |
1954 | static int |
1955 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1956 | { | |
1957 | int ret; | |
1da177e4 | 1958 | |
82fac054 BS |
1959 | if (!capable(CAP_NET_ADMIN)) |
1960 | return -EPERM; | |
1961 | ||
2722971c DM |
1962 | switch (cmd) { |
1963 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1964 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1965 | break; |
1966 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1967 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1968 | break; |
1969 | default: | |
79030ed0 | 1970 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1971 | } |
1da177e4 LT |
1972 | return ret; |
1973 | } | |
2722971c | 1974 | #endif |
1da177e4 LT |
1975 | |
1976 | static int | |
9c547959 | 1977 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
1978 | { |
1979 | int ret; | |
1980 | ||
1981 | if (!capable(CAP_NET_ADMIN)) | |
1982 | return -EPERM; | |
1983 | ||
1984 | switch (cmd) { | |
1985 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1986 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1987 | break; |
1988 | ||
1989 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1990 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
1991 | break; |
1992 | ||
1993 | default: | |
1994 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1995 | ret = -EINVAL; | |
1996 | } | |
1997 | ||
1998 | return ret; | |
1999 | } | |
2000 | ||
2001 | static int | |
2002 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2003 | { | |
2004 | int ret; | |
2005 | ||
2006 | if (!capable(CAP_NET_ADMIN)) | |
2007 | return -EPERM; | |
2008 | ||
2009 | switch (cmd) { | |
2722971c | 2010 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2011 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2012 | break; |
1da177e4 | 2013 | |
2722971c | 2014 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2015 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2016 | break; |
1da177e4 LT |
2017 | |
2018 | case IPT_SO_GET_REVISION_MATCH: | |
2019 | case IPT_SO_GET_REVISION_TARGET: { | |
2020 | struct ipt_get_revision rev; | |
2e4e6a17 | 2021 | int target; |
1da177e4 LT |
2022 | |
2023 | if (*len != sizeof(rev)) { | |
2024 | ret = -EINVAL; | |
2025 | break; | |
2026 | } | |
2027 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2028 | ret = -EFAULT; | |
2029 | break; | |
2030 | } | |
2031 | ||
2032 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2033 | target = 1; |
1da177e4 | 2034 | else |
2e4e6a17 | 2035 | target = 0; |
1da177e4 | 2036 | |
2e4e6a17 HW |
2037 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2038 | rev.revision, | |
2039 | target, &ret), | |
1da177e4 LT |
2040 | "ipt_%s", rev.name); |
2041 | break; | |
2042 | } | |
2043 | ||
2044 | default: | |
2045 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2046 | ret = -EINVAL; | |
2047 | } | |
2048 | ||
2049 | return ret; | |
2050 | } | |
2051 | ||
44d34e72 AD |
2052 | struct xt_table *ipt_register_table(struct net *net, struct xt_table *table, |
2053 | const struct ipt_replace *repl) | |
1da177e4 LT |
2054 | { |
2055 | int ret; | |
2e4e6a17 | 2056 | struct xt_table_info *newinfo; |
259d4e41 | 2057 | struct xt_table_info bootstrap |
1da177e4 | 2058 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2059 | void *loc_cpu_entry; |
a98da11d | 2060 | struct xt_table *new_table; |
1da177e4 | 2061 | |
2e4e6a17 | 2062 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2063 | if (!newinfo) { |
2064 | ret = -ENOMEM; | |
2065 | goto out; | |
2066 | } | |
1da177e4 | 2067 | |
9c547959 | 2068 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2069 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2070 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
2071 | |
2072 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 2073 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
2074 | repl->num_entries, |
2075 | repl->hook_entry, | |
2076 | repl->underflow); | |
44d34e72 AD |
2077 | if (ret != 0) |
2078 | goto out_free; | |
1da177e4 | 2079 | |
44d34e72 | 2080 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2081 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2082 | ret = PTR_ERR(new_table); |
2083 | goto out_free; | |
1da177e4 LT |
2084 | } |
2085 | ||
44d34e72 AD |
2086 | return new_table; |
2087 | ||
2088 | out_free: | |
2089 | xt_free_table_info(newinfo); | |
2090 | out: | |
2091 | return ERR_PTR(ret); | |
1da177e4 LT |
2092 | } |
2093 | ||
e60a13e0 | 2094 | void ipt_unregister_table(struct xt_table *table) |
1da177e4 | 2095 | { |
2e4e6a17 | 2096 | struct xt_table_info *private; |
31836064 | 2097 | void *loc_cpu_entry; |
df200969 | 2098 | struct module *table_owner = table->me; |
31836064 | 2099 | |
e905a9ed | 2100 | private = xt_unregister_table(table); |
1da177e4 LT |
2101 | |
2102 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
2103 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
2104 | IPT_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
df200969 AD |
2105 | if (private->number > private->initial_entries) |
2106 | module_put(table_owner); | |
2e4e6a17 | 2107 | xt_free_table_info(private); |
1da177e4 LT |
2108 | } |
2109 | ||
2110 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2111 | static inline bool |
1da177e4 LT |
2112 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2113 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2114 | bool invert) |
1da177e4 | 2115 | { |
9c547959 PM |
2116 | return ((test_type == 0xFF) || |
2117 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2118 | ^ invert; |
2119 | } | |
2120 | ||
1d93a9cb | 2121 | static bool |
f7108a20 | 2122 | icmp_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2123 | { |
5452e425 JE |
2124 | const struct icmphdr *ic; |
2125 | struct icmphdr _icmph; | |
f7108a20 | 2126 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2127 | |
2128 | /* Must not be a fragment. */ | |
f7108a20 | 2129 | if (par->fragoff != 0) |
1d93a9cb | 2130 | return false; |
1da177e4 | 2131 | |
f7108a20 | 2132 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2133 | if (ic == NULL) { |
2134 | /* We've been asked to examine this packet, and we | |
2135 | * can't. Hence, no choice but to drop. | |
2136 | */ | |
2137 | duprintf("Dropping evil ICMP tinygram.\n"); | |
f7108a20 | 2138 | *par->hotdrop = true; |
1d93a9cb | 2139 | return false; |
1da177e4 LT |
2140 | } |
2141 | ||
2142 | return icmp_type_code_match(icmpinfo->type, | |
2143 | icmpinfo->code[0], | |
2144 | icmpinfo->code[1], | |
2145 | ic->type, ic->code, | |
2146 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2147 | } | |
2148 | ||
9b4fce7a | 2149 | static bool icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2150 | { |
9b4fce7a | 2151 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2152 | |
1d5cd909 PM |
2153 | /* Must specify no unknown invflags */ |
2154 | return !(icmpinfo->invflags & ~IPT_ICMP_INV); | |
1da177e4 LT |
2155 | } |
2156 | ||
2157 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2158 | static struct xt_target ipt_standard_target __read_mostly = { |
1da177e4 | 2159 | .name = IPT_STANDARD_TARGET, |
1d5cd909 | 2160 | .targetsize = sizeof(int), |
4ba351cf | 2161 | .family = NFPROTO_IPV4, |
2722971c | 2162 | #ifdef CONFIG_COMPAT |
9fa492cd PM |
2163 | .compatsize = sizeof(compat_int_t), |
2164 | .compat_from_user = compat_standard_from_user, | |
2165 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2166 | #endif |
1da177e4 LT |
2167 | }; |
2168 | ||
9f15c530 | 2169 | static struct xt_target ipt_error_target __read_mostly = { |
1da177e4 LT |
2170 | .name = IPT_ERROR_TARGET, |
2171 | .target = ipt_error, | |
1d5cd909 | 2172 | .targetsize = IPT_FUNCTION_MAXNAMELEN, |
4ba351cf | 2173 | .family = NFPROTO_IPV4, |
1da177e4 LT |
2174 | }; |
2175 | ||
2176 | static struct nf_sockopt_ops ipt_sockopts = { | |
2177 | .pf = PF_INET, | |
2178 | .set_optmin = IPT_BASE_CTL, | |
2179 | .set_optmax = IPT_SO_SET_MAX+1, | |
2180 | .set = do_ipt_set_ctl, | |
2722971c DM |
2181 | #ifdef CONFIG_COMPAT |
2182 | .compat_set = compat_do_ipt_set_ctl, | |
2183 | #endif | |
1da177e4 LT |
2184 | .get_optmin = IPT_BASE_CTL, |
2185 | .get_optmax = IPT_SO_GET_MAX+1, | |
2186 | .get = do_ipt_get_ctl, | |
2722971c DM |
2187 | #ifdef CONFIG_COMPAT |
2188 | .compat_get = compat_do_ipt_get_ctl, | |
2189 | #endif | |
16fcec35 | 2190 | .owner = THIS_MODULE, |
1da177e4 LT |
2191 | }; |
2192 | ||
9f15c530 | 2193 | static struct xt_match icmp_matchstruct __read_mostly = { |
1da177e4 | 2194 | .name = "icmp", |
1d5cd909 PM |
2195 | .match = icmp_match, |
2196 | .matchsize = sizeof(struct ipt_icmp), | |
9c547959 | 2197 | .checkentry = icmp_checkentry, |
1d5cd909 | 2198 | .proto = IPPROTO_ICMP, |
4ba351cf | 2199 | .family = NFPROTO_IPV4, |
1da177e4 LT |
2200 | }; |
2201 | ||
3cb609d5 AD |
2202 | static int __net_init ip_tables_net_init(struct net *net) |
2203 | { | |
383ca5b8 | 2204 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
2205 | } |
2206 | ||
2207 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2208 | { | |
383ca5b8 | 2209 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
2210 | } |
2211 | ||
2212 | static struct pernet_operations ip_tables_net_ops = { | |
2213 | .init = ip_tables_net_init, | |
2214 | .exit = ip_tables_net_exit, | |
2215 | }; | |
2216 | ||
65b4b4e8 | 2217 | static int __init ip_tables_init(void) |
1da177e4 LT |
2218 | { |
2219 | int ret; | |
2220 | ||
3cb609d5 | 2221 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2222 | if (ret < 0) |
2223 | goto err1; | |
2e4e6a17 | 2224 | |
1da177e4 | 2225 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2226 | ret = xt_register_target(&ipt_standard_target); |
2227 | if (ret < 0) | |
2228 | goto err2; | |
2229 | ret = xt_register_target(&ipt_error_target); | |
2230 | if (ret < 0) | |
2231 | goto err3; | |
2232 | ret = xt_register_match(&icmp_matchstruct); | |
2233 | if (ret < 0) | |
2234 | goto err4; | |
1da177e4 LT |
2235 | |
2236 | /* Register setsockopt */ | |
2237 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2238 | if (ret < 0) |
2239 | goto err5; | |
1da177e4 | 2240 | |
0236e667 | 2241 | printk(KERN_INFO "ip_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2242 | return 0; |
0eff66e6 PM |
2243 | |
2244 | err5: | |
2245 | xt_unregister_match(&icmp_matchstruct); | |
2246 | err4: | |
2247 | xt_unregister_target(&ipt_error_target); | |
2248 | err3: | |
2249 | xt_unregister_target(&ipt_standard_target); | |
2250 | err2: | |
3cb609d5 | 2251 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2252 | err1: |
2253 | return ret; | |
1da177e4 LT |
2254 | } |
2255 | ||
65b4b4e8 | 2256 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2257 | { |
2258 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2259 | |
a45049c5 PNA |
2260 | xt_unregister_match(&icmp_matchstruct); |
2261 | xt_unregister_target(&ipt_error_target); | |
2262 | xt_unregister_target(&ipt_standard_target); | |
2e4e6a17 | 2263 | |
3cb609d5 | 2264 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2265 | } |
2266 | ||
2267 | EXPORT_SYMBOL(ipt_register_table); | |
2268 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2269 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2270 | module_init(ip_tables_init); |
2271 | module_exit(ip_tables_fini); |