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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Packet matching code. | |
3 | * | |
4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
2e4e6a17 | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
1da177e4 | 10 | */ |
1da177e4 | 11 | #include <linux/cache.h> |
4fc268d2 | 12 | #include <linux/capability.h> |
1da177e4 LT |
13 | #include <linux/skbuff.h> |
14 | #include <linux/kmod.h> | |
15 | #include <linux/vmalloc.h> | |
16 | #include <linux/netdevice.h> | |
17 | #include <linux/module.h> | |
1da177e4 LT |
18 | #include <linux/icmp.h> |
19 | #include <net/ip.h> | |
2722971c | 20 | #include <net/compat.h> |
1da177e4 | 21 | #include <asm/uaccess.h> |
57b47a53 | 22 | #include <linux/mutex.h> |
1da177e4 LT |
23 | #include <linux/proc_fs.h> |
24 | #include <linux/err.h> | |
c8923c6b | 25 | #include <linux/cpumask.h> |
1da177e4 | 26 | |
2e4e6a17 | 27 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 28 | #include <linux/netfilter_ipv4/ip_tables.h> |
f01ffbd6 | 29 | #include <net/netfilter/nf_log.h> |
1da177e4 LT |
30 | |
31 | MODULE_LICENSE("GPL"); | |
32 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
33 | MODULE_DESCRIPTION("IPv4 packet filter"); | |
34 | ||
35 | /*#define DEBUG_IP_FIREWALL*/ | |
36 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
37 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
38 | ||
39 | #ifdef DEBUG_IP_FIREWALL | |
40 | #define dprintf(format, args...) printk(format , ## args) | |
41 | #else | |
42 | #define dprintf(format, args...) | |
43 | #endif | |
44 | ||
45 | #ifdef DEBUG_IP_FIREWALL_USER | |
46 | #define duprintf(format, args...) printk(format , ## args) | |
47 | #else | |
48 | #define duprintf(format, args...) | |
49 | #endif | |
50 | ||
51 | #ifdef CONFIG_NETFILTER_DEBUG | |
52 | #define IP_NF_ASSERT(x) \ | |
53 | do { \ | |
54 | if (!(x)) \ | |
55 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ | |
0dc47877 | 56 | __func__, __FILE__, __LINE__); \ |
1da177e4 LT |
57 | } while(0) |
58 | #else | |
59 | #define IP_NF_ASSERT(x) | |
60 | #endif | |
1da177e4 LT |
61 | |
62 | #if 0 | |
63 | /* All the better to debug you with... */ | |
64 | #define static | |
65 | #define inline | |
66 | #endif | |
67 | ||
68 | /* | |
69 | We keep a set of rules for each CPU, so we can avoid write-locking | |
70 | them in the softirq when updating the counters and therefore | |
71 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
72 | context stops packets coming through and allows user context to read | |
73 | the counters or update the rules. | |
74 | ||
1da177e4 LT |
75 | Hence the start of any table is given by get_table() below. */ |
76 | ||
1da177e4 | 77 | /* Returns whether matches rule or not. */ |
022748a9 | 78 | /* Performance critical - called for every packet */ |
9c547959 | 79 | static inline bool |
1da177e4 LT |
80 | ip_packet_match(const struct iphdr *ip, |
81 | const char *indev, | |
82 | const char *outdev, | |
83 | const struct ipt_ip *ipinfo, | |
84 | int isfrag) | |
85 | { | |
86 | size_t i; | |
87 | unsigned long ret; | |
88 | ||
e79ec50b | 89 | #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) |
1da177e4 LT |
90 | |
91 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, | |
92 | IPT_INV_SRCIP) | |
93 | || FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, | |
94 | IPT_INV_DSTIP)) { | |
95 | dprintf("Source or dest mismatch.\n"); | |
96 | ||
cffee385 HH |
97 | dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n", |
98 | &ip->saddr, &ipinfo->smsk.s_addr, &ipinfo->src.s_addr, | |
1da177e4 | 99 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); |
cffee385 HH |
100 | dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n", |
101 | &ip->daddr, &ipinfo->dmsk.s_addr, &ipinfo->dst.s_addr, | |
1da177e4 | 102 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); |
9c547959 | 103 | return false; |
1da177e4 LT |
104 | } |
105 | ||
106 | /* Look for ifname matches; this should unroll nicely. */ | |
107 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
108 | ret |= (((const unsigned long *)indev)[i] | |
109 | ^ ((const unsigned long *)ipinfo->iniface)[i]) | |
110 | & ((const unsigned long *)ipinfo->iniface_mask)[i]; | |
111 | } | |
112 | ||
113 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { | |
114 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
115 | indev, ipinfo->iniface, | |
116 | ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":""); | |
9c547959 | 117 | return false; |
1da177e4 LT |
118 | } |
119 | ||
120 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
121 | ret |= (((const unsigned long *)outdev)[i] | |
122 | ^ ((const unsigned long *)ipinfo->outiface)[i]) | |
123 | & ((const unsigned long *)ipinfo->outiface_mask)[i]; | |
124 | } | |
125 | ||
126 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { | |
127 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
128 | outdev, ipinfo->outiface, | |
129 | ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":""); | |
9c547959 | 130 | return false; |
1da177e4 LT |
131 | } |
132 | ||
133 | /* Check specific protocol */ | |
134 | if (ipinfo->proto | |
135 | && FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { | |
136 | dprintf("Packet protocol %hi does not match %hi.%s\n", | |
137 | ip->protocol, ipinfo->proto, | |
138 | ipinfo->invflags&IPT_INV_PROTO ? " (INV)":""); | |
9c547959 | 139 | return false; |
1da177e4 LT |
140 | } |
141 | ||
142 | /* If we have a fragment rule but the packet is not a fragment | |
143 | * then we return zero */ | |
144 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { | |
145 | dprintf("Fragment rule but not fragment.%s\n", | |
146 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); | |
9c547959 | 147 | return false; |
1da177e4 LT |
148 | } |
149 | ||
9c547959 | 150 | return true; |
1da177e4 LT |
151 | } |
152 | ||
022748a9 | 153 | static bool |
1da177e4 LT |
154 | ip_checkentry(const struct ipt_ip *ip) |
155 | { | |
156 | if (ip->flags & ~IPT_F_MASK) { | |
157 | duprintf("Unknown flag bits set: %08X\n", | |
158 | ip->flags & ~IPT_F_MASK); | |
ccb79bdc | 159 | return false; |
1da177e4 LT |
160 | } |
161 | if (ip->invflags & ~IPT_INV_MASK) { | |
162 | duprintf("Unknown invflag bits set: %08X\n", | |
163 | ip->invflags & ~IPT_INV_MASK); | |
ccb79bdc | 164 | return false; |
1da177e4 | 165 | } |
ccb79bdc | 166 | return true; |
1da177e4 LT |
167 | } |
168 | ||
169 | static unsigned int | |
7eb35586 | 170 | ipt_error(struct sk_buff *skb, const struct xt_target_param *par) |
1da177e4 LT |
171 | { |
172 | if (net_ratelimit()) | |
7eb35586 JE |
173 | printk("ip_tables: error: `%s'\n", |
174 | (const char *)par->targinfo); | |
1da177e4 LT |
175 | |
176 | return NF_DROP; | |
177 | } | |
178 | ||
022748a9 DV |
179 | /* Performance critical - called for every packet */ |
180 | static inline bool | |
f7108a20 JE |
181 | do_match(struct ipt_entry_match *m, const struct sk_buff *skb, |
182 | struct xt_match_param *par) | |
1da177e4 | 183 | { |
f7108a20 JE |
184 | par->match = m->u.kernel.match; |
185 | par->matchinfo = m->data; | |
186 | ||
1da177e4 | 187 | /* Stop iteration if it doesn't match */ |
f7108a20 | 188 | if (!m->u.kernel.match->match(skb, par)) |
1d93a9cb | 189 | return true; |
1da177e4 | 190 | else |
1d93a9cb | 191 | return false; |
1da177e4 LT |
192 | } |
193 | ||
022748a9 | 194 | /* Performance critical */ |
1da177e4 LT |
195 | static inline struct ipt_entry * |
196 | get_entry(void *base, unsigned int offset) | |
197 | { | |
198 | return (struct ipt_entry *)(base + offset); | |
199 | } | |
200 | ||
ba9dda3a | 201 | /* All zeroes == unconditional rule. */ |
022748a9 | 202 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
203 | static inline int |
204 | unconditional(const struct ipt_ip *ip) | |
205 | { | |
206 | unsigned int i; | |
207 | ||
208 | for (i = 0; i < sizeof(*ip)/sizeof(__u32); i++) | |
209 | if (((__u32 *)ip)[i]) | |
210 | return 0; | |
211 | ||
212 | return 1; | |
e79ec50b | 213 | #undef FWINV |
ba9dda3a JK |
214 | } |
215 | ||
216 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
217 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
022748a9 | 218 | static const char *const hooknames[] = { |
6e23ae2a PM |
219 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
220 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 221 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
222 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
223 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
224 | }; |
225 | ||
226 | enum nf_ip_trace_comments { | |
227 | NF_IP_TRACE_COMMENT_RULE, | |
228 | NF_IP_TRACE_COMMENT_RETURN, | |
229 | NF_IP_TRACE_COMMENT_POLICY, | |
230 | }; | |
231 | ||
022748a9 | 232 | static const char *const comments[] = { |
ba9dda3a JK |
233 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
234 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
235 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
236 | }; | |
237 | ||
238 | static struct nf_loginfo trace_loginfo = { | |
239 | .type = NF_LOG_TYPE_LOG, | |
240 | .u = { | |
241 | .log = { | |
242 | .level = 4, | |
243 | .logflags = NF_LOG_MASK, | |
244 | }, | |
245 | }, | |
246 | }; | |
247 | ||
022748a9 | 248 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
249 | static inline int |
250 | get_chainname_rulenum(struct ipt_entry *s, struct ipt_entry *e, | |
251 | char *hookname, char **chainname, | |
252 | char **comment, unsigned int *rulenum) | |
253 | { | |
254 | struct ipt_standard_target *t = (void *)ipt_get_target(s); | |
255 | ||
256 | if (strcmp(t->target.u.kernel.target->name, IPT_ERROR_TARGET) == 0) { | |
257 | /* Head of user chain: ERROR target with chainname */ | |
258 | *chainname = t->target.data; | |
259 | (*rulenum) = 0; | |
260 | } else if (s == e) { | |
261 | (*rulenum)++; | |
262 | ||
263 | if (s->target_offset == sizeof(struct ipt_entry) | |
264 | && strcmp(t->target.u.kernel.target->name, | |
265 | IPT_STANDARD_TARGET) == 0 | |
266 | && t->verdict < 0 | |
267 | && unconditional(&s->ip)) { | |
268 | /* Tail of chains: STANDARD target (return/policy) */ | |
269 | *comment = *chainname == hookname | |
270 | ? (char *)comments[NF_IP_TRACE_COMMENT_POLICY] | |
271 | : (char *)comments[NF_IP_TRACE_COMMENT_RETURN]; | |
272 | } | |
273 | return 1; | |
274 | } else | |
275 | (*rulenum)++; | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static void trace_packet(struct sk_buff *skb, | |
281 | unsigned int hook, | |
282 | const struct net_device *in, | |
283 | const struct net_device *out, | |
ecb6f85e | 284 | const char *tablename, |
ba9dda3a JK |
285 | struct xt_table_info *private, |
286 | struct ipt_entry *e) | |
287 | { | |
288 | void *table_base; | |
5452e425 | 289 | const struct ipt_entry *root; |
ba9dda3a JK |
290 | char *hookname, *chainname, *comment; |
291 | unsigned int rulenum = 0; | |
292 | ||
293 | table_base = (void *)private->entries[smp_processor_id()]; | |
294 | root = get_entry(table_base, private->hook_entry[hook]); | |
295 | ||
296 | hookname = chainname = (char *)hooknames[hook]; | |
297 | comment = (char *)comments[NF_IP_TRACE_COMMENT_RULE]; | |
298 | ||
299 | IPT_ENTRY_ITERATE(root, | |
300 | private->size - private->hook_entry[hook], | |
301 | get_chainname_rulenum, | |
302 | e, hookname, &chainname, &comment, &rulenum); | |
303 | ||
304 | nf_log_packet(AF_INET, hook, skb, in, out, &trace_loginfo, | |
305 | "TRACE: %s:%s:%s:%u ", | |
306 | tablename, chainname, comment, rulenum); | |
307 | } | |
308 | #endif | |
309 | ||
1da177e4 LT |
310 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
311 | unsigned int | |
3db05fea | 312 | ipt_do_table(struct sk_buff *skb, |
1da177e4 LT |
313 | unsigned int hook, |
314 | const struct net_device *in, | |
315 | const struct net_device *out, | |
e60a13e0 | 316 | struct xt_table *table) |
1da177e4 LT |
317 | { |
318 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); | |
5452e425 | 319 | const struct iphdr *ip; |
1da177e4 | 320 | u_int16_t datalen; |
cff533ac | 321 | bool hotdrop = false; |
1da177e4 LT |
322 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
323 | unsigned int verdict = NF_DROP; | |
324 | const char *indev, *outdev; | |
325 | void *table_base; | |
326 | struct ipt_entry *e, *back; | |
8311731a | 327 | struct xt_table_info *private; |
f7108a20 | 328 | struct xt_match_param mtpar; |
7eb35586 | 329 | struct xt_target_param tgpar; |
1da177e4 LT |
330 | |
331 | /* Initialization */ | |
3db05fea HX |
332 | ip = ip_hdr(skb); |
333 | datalen = skb->len - ip->ihl * 4; | |
1da177e4 LT |
334 | indev = in ? in->name : nulldevname; |
335 | outdev = out ? out->name : nulldevname; | |
336 | /* We handle fragments by dealing with the first fragment as | |
337 | * if it was a normal packet. All other fragments are treated | |
338 | * normally, except that they will NEVER match rules that ask | |
339 | * things we don't know, ie. tcp syn flag or ports). If the | |
340 | * rule is also a fragment-specific rule, non-fragments won't | |
341 | * match it. */ | |
f7108a20 JE |
342 | mtpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
343 | mtpar.thoff = ip_hdrlen(skb); | |
344 | mtpar.hotdrop = &hotdrop; | |
7eb35586 JE |
345 | mtpar.in = tgpar.in = in; |
346 | mtpar.out = tgpar.out = out; | |
916a917d | 347 | mtpar.family = tgpar.family = NFPROTO_IPV4; |
7eb35586 | 348 | tgpar.hooknum = hook; |
1da177e4 LT |
349 | |
350 | read_lock_bh(&table->lock); | |
351 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); | |
8311731a | 352 | private = table->private; |
2e4e6a17 HW |
353 | table_base = (void *)private->entries[smp_processor_id()]; |
354 | e = get_entry(table_base, private->hook_entry[hook]); | |
1da177e4 LT |
355 | |
356 | /* For return from builtin chain */ | |
2e4e6a17 | 357 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
358 | |
359 | do { | |
360 | IP_NF_ASSERT(e); | |
361 | IP_NF_ASSERT(back); | |
f7108a20 JE |
362 | if (ip_packet_match(ip, indev, outdev, |
363 | &e->ip, mtpar.fragoff)) { | |
1da177e4 LT |
364 | struct ipt_entry_target *t; |
365 | ||
f7108a20 | 366 | if (IPT_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) |
1da177e4 LT |
367 | goto no_match; |
368 | ||
369 | ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1); | |
370 | ||
371 | t = ipt_get_target(e); | |
372 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
373 | |
374 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
375 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
376 | /* The packet is traced: log it */ | |
3db05fea HX |
377 | if (unlikely(skb->nf_trace)) |
378 | trace_packet(skb, hook, in, out, | |
ba9dda3a JK |
379 | table->name, private, e); |
380 | #endif | |
1da177e4 LT |
381 | /* Standard target? */ |
382 | if (!t->u.kernel.target->target) { | |
383 | int v; | |
384 | ||
385 | v = ((struct ipt_standard_target *)t)->verdict; | |
386 | if (v < 0) { | |
387 | /* Pop from stack? */ | |
388 | if (v != IPT_RETURN) { | |
389 | verdict = (unsigned)(-v) - 1; | |
390 | break; | |
391 | } | |
392 | e = back; | |
393 | back = get_entry(table_base, | |
394 | back->comefrom); | |
395 | continue; | |
396 | } | |
05465343 PM |
397 | if (table_base + v != (void *)e + e->next_offset |
398 | && !(e->ip.flags & IPT_F_GOTO)) { | |
1da177e4 LT |
399 | /* Save old back ptr in next entry */ |
400 | struct ipt_entry *next | |
401 | = (void *)e + e->next_offset; | |
402 | next->comefrom | |
403 | = (void *)back - table_base; | |
404 | /* set back pointer to next entry */ | |
405 | back = next; | |
406 | } | |
407 | ||
408 | e = get_entry(table_base, v); | |
409 | } else { | |
410 | /* Targets which reenter must return | |
e905a9ed | 411 | abs. verdicts */ |
7eb35586 JE |
412 | tgpar.target = t->u.kernel.target; |
413 | tgpar.targinfo = t->data; | |
1da177e4 LT |
414 | #ifdef CONFIG_NETFILTER_DEBUG |
415 | ((struct ipt_entry *)table_base)->comefrom | |
416 | = 0xeeeeeeec; | |
417 | #endif | |
3db05fea | 418 | verdict = t->u.kernel.target->target(skb, |
7eb35586 | 419 | &tgpar); |
1da177e4 LT |
420 | #ifdef CONFIG_NETFILTER_DEBUG |
421 | if (((struct ipt_entry *)table_base)->comefrom | |
422 | != 0xeeeeeeec | |
423 | && verdict == IPT_CONTINUE) { | |
424 | printk("Target %s reentered!\n", | |
425 | t->u.kernel.target->name); | |
426 | verdict = NF_DROP; | |
427 | } | |
428 | ((struct ipt_entry *)table_base)->comefrom | |
429 | = 0x57acc001; | |
430 | #endif | |
431 | /* Target might have changed stuff. */ | |
3db05fea HX |
432 | ip = ip_hdr(skb); |
433 | datalen = skb->len - ip->ihl * 4; | |
1da177e4 LT |
434 | |
435 | if (verdict == IPT_CONTINUE) | |
436 | e = (void *)e + e->next_offset; | |
437 | else | |
438 | /* Verdict */ | |
439 | break; | |
440 | } | |
441 | } else { | |
442 | ||
443 | no_match: | |
444 | e = (void *)e + e->next_offset; | |
445 | } | |
446 | } while (!hotdrop); | |
447 | ||
1da177e4 LT |
448 | read_unlock_bh(&table->lock); |
449 | ||
450 | #ifdef DEBUG_ALLOW_ALL | |
451 | return NF_ACCEPT; | |
452 | #else | |
453 | if (hotdrop) | |
454 | return NF_DROP; | |
455 | else return verdict; | |
456 | #endif | |
457 | } | |
458 | ||
1da177e4 LT |
459 | /* Figures out from what hook each rule can be called: returns 0 if |
460 | there are loops. Puts hook bitmask in comefrom. */ | |
461 | static int | |
2e4e6a17 | 462 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 463 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
464 | { |
465 | unsigned int hook; | |
466 | ||
467 | /* No recursion; use packet counter to save back ptrs (reset | |
468 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 469 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 470 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 471 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
472 | |
473 | if (!(valid_hooks & (1 << hook))) | |
474 | continue; | |
475 | ||
476 | /* Set initial back pointer. */ | |
477 | e->counters.pcnt = pos; | |
478 | ||
479 | for (;;) { | |
480 | struct ipt_standard_target *t | |
481 | = (void *)ipt_get_target(e); | |
e1b4b9f3 | 482 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 483 | |
6e23ae2a | 484 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
485 | printk("iptables: loop hook %u pos %u %08X.\n", |
486 | hook, pos, e->comefrom); | |
487 | return 0; | |
488 | } | |
9c547959 | 489 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
490 | |
491 | /* Unconditional return/END. */ | |
e1b4b9f3 | 492 | if ((e->target_offset == sizeof(struct ipt_entry) |
1da177e4 LT |
493 | && (strcmp(t->target.u.user.name, |
494 | IPT_STANDARD_TARGET) == 0) | |
495 | && t->verdict < 0 | |
e1b4b9f3 | 496 | && unconditional(&e->ip)) || visited) { |
1da177e4 LT |
497 | unsigned int oldpos, size; |
498 | ||
74c9c0c1 DM |
499 | if (t->verdict < -NF_MAX_VERDICT - 1) { |
500 | duprintf("mark_source_chains: bad " | |
501 | "negative verdict (%i)\n", | |
502 | t->verdict); | |
503 | return 0; | |
504 | } | |
505 | ||
1da177e4 LT |
506 | /* Return: backtrack through the last |
507 | big jump. */ | |
508 | do { | |
6e23ae2a | 509 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
510 | #ifdef DEBUG_IP_FIREWALL_USER |
511 | if (e->comefrom | |
6e23ae2a | 512 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
513 | duprintf("Back unset " |
514 | "on hook %u " | |
515 | "rule %u\n", | |
516 | hook, pos); | |
517 | } | |
518 | #endif | |
519 | oldpos = pos; | |
520 | pos = e->counters.pcnt; | |
521 | e->counters.pcnt = 0; | |
522 | ||
523 | /* We're at the start. */ | |
524 | if (pos == oldpos) | |
525 | goto next; | |
526 | ||
527 | e = (struct ipt_entry *) | |
31836064 | 528 | (entry0 + pos); |
1da177e4 LT |
529 | } while (oldpos == pos + e->next_offset); |
530 | ||
531 | /* Move along one */ | |
532 | size = e->next_offset; | |
533 | e = (struct ipt_entry *) | |
31836064 | 534 | (entry0 + pos + size); |
1da177e4 LT |
535 | e->counters.pcnt = pos; |
536 | pos += size; | |
537 | } else { | |
538 | int newpos = t->verdict; | |
539 | ||
540 | if (strcmp(t->target.u.user.name, | |
541 | IPT_STANDARD_TARGET) == 0 | |
542 | && newpos >= 0) { | |
74c9c0c1 DM |
543 | if (newpos > newinfo->size - |
544 | sizeof(struct ipt_entry)) { | |
545 | duprintf("mark_source_chains: " | |
546 | "bad verdict (%i)\n", | |
547 | newpos); | |
548 | return 0; | |
549 | } | |
1da177e4 LT |
550 | /* This a jump; chase it. */ |
551 | duprintf("Jump rule %u -> %u\n", | |
552 | pos, newpos); | |
553 | } else { | |
554 | /* ... this is a fallthru */ | |
555 | newpos = pos + e->next_offset; | |
556 | } | |
557 | e = (struct ipt_entry *) | |
31836064 | 558 | (entry0 + newpos); |
1da177e4 LT |
559 | e->counters.pcnt = pos; |
560 | pos = newpos; | |
561 | } | |
562 | } | |
563 | next: | |
564 | duprintf("Finished chain %u\n", hook); | |
565 | } | |
566 | return 1; | |
567 | } | |
568 | ||
022748a9 | 569 | static int |
1da177e4 LT |
570 | cleanup_match(struct ipt_entry_match *m, unsigned int *i) |
571 | { | |
6be3d859 JE |
572 | struct xt_mtdtor_param par; |
573 | ||
1da177e4 LT |
574 | if (i && (*i)-- == 0) |
575 | return 1; | |
576 | ||
6be3d859 JE |
577 | par.match = m->u.kernel.match; |
578 | par.matchinfo = m->data; | |
916a917d | 579 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
580 | if (par.match->destroy != NULL) |
581 | par.match->destroy(&par); | |
582 | module_put(par.match->me); | |
1da177e4 LT |
583 | return 0; |
584 | } | |
585 | ||
022748a9 | 586 | static int |
a96be246 DM |
587 | check_entry(struct ipt_entry *e, const char *name) |
588 | { | |
589 | struct ipt_entry_target *t; | |
590 | ||
591 | if (!ip_checkentry(&e->ip)) { | |
592 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
593 | return -EINVAL; | |
594 | } | |
595 | ||
9c547959 PM |
596 | if (e->target_offset + sizeof(struct ipt_entry_target) > |
597 | e->next_offset) | |
a96be246 DM |
598 | return -EINVAL; |
599 | ||
600 | t = ipt_get_target(e); | |
601 | if (e->target_offset + t->u.target_size > e->next_offset) | |
602 | return -EINVAL; | |
603 | ||
604 | return 0; | |
605 | } | |
606 | ||
022748a9 | 607 | static int |
9b4fce7a JE |
608 | check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par, |
609 | unsigned int *i) | |
a96be246 | 610 | { |
9b4fce7a | 611 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 DM |
612 | int ret; |
613 | ||
9b4fce7a JE |
614 | par->match = m->u.kernel.match; |
615 | par->matchinfo = m->data; | |
616 | ||
916a917d | 617 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 618 | ip->proto, ip->invflags & IPT_INV_PROTO); |
367c6790 | 619 | if (ret < 0) { |
a96be246 | 620 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 621 | par.match->name); |
367c6790 | 622 | return ret; |
a96be246 | 623 | } |
367c6790 JE |
624 | ++*i; |
625 | return 0; | |
a96be246 DM |
626 | } |
627 | ||
022748a9 | 628 | static int |
9b4fce7a | 629 | find_check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par, |
4b478248 | 630 | unsigned int *i) |
1da177e4 | 631 | { |
6709dbbb | 632 | struct xt_match *match; |
3cdc7c95 | 633 | int ret; |
1da177e4 | 634 | |
2e4e6a17 | 635 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, |
9c547959 | 636 | m->u.user.revision), |
1da177e4 LT |
637 | "ipt_%s", m->u.user.name); |
638 | if (IS_ERR(match) || !match) { | |
a96be246 | 639 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
1da177e4 LT |
640 | return match ? PTR_ERR(match) : -ENOENT; |
641 | } | |
642 | m->u.kernel.match = match; | |
643 | ||
9b4fce7a | 644 | ret = check_match(m, par, i); |
3cdc7c95 PM |
645 | if (ret) |
646 | goto err; | |
647 | ||
1da177e4 | 648 | return 0; |
3cdc7c95 PM |
649 | err: |
650 | module_put(m->u.kernel.match->me); | |
651 | return ret; | |
1da177e4 LT |
652 | } |
653 | ||
022748a9 | 654 | static int check_target(struct ipt_entry *e, const char *name) |
a96be246 | 655 | { |
af5d6dc2 JE |
656 | struct ipt_entry_target *t = ipt_get_target(e); |
657 | struct xt_tgchk_param par = { | |
658 | .table = name, | |
659 | .entryinfo = e, | |
660 | .target = t->u.kernel.target, | |
661 | .targinfo = t->data, | |
662 | .hook_mask = e->comefrom, | |
916a917d | 663 | .family = NFPROTO_IPV4, |
af5d6dc2 | 664 | }; |
e905a9ed | 665 | int ret; |
a96be246 | 666 | |
916a917d | 667 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 668 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
367c6790 | 669 | if (ret < 0) { |
a96be246 DM |
670 | duprintf("ip_tables: check failed for `%s'.\n", |
671 | t->u.kernel.target->name); | |
367c6790 | 672 | return ret; |
a96be246 | 673 | } |
367c6790 | 674 | return 0; |
a96be246 | 675 | } |
1da177e4 | 676 | |
022748a9 | 677 | static int |
a96be246 | 678 | find_check_entry(struct ipt_entry *e, const char *name, unsigned int size, |
4b478248 | 679 | unsigned int *i) |
1da177e4 LT |
680 | { |
681 | struct ipt_entry_target *t; | |
6709dbbb | 682 | struct xt_target *target; |
1da177e4 LT |
683 | int ret; |
684 | unsigned int j; | |
9b4fce7a | 685 | struct xt_mtchk_param mtpar; |
1da177e4 | 686 | |
a96be246 DM |
687 | ret = check_entry(e, name); |
688 | if (ret) | |
689 | return ret; | |
590bdf7f | 690 | |
1da177e4 | 691 | j = 0; |
9b4fce7a JE |
692 | mtpar.table = name; |
693 | mtpar.entryinfo = &e->ip; | |
694 | mtpar.hook_mask = e->comefrom; | |
916a917d | 695 | mtpar.family = NFPROTO_IPV4; |
9b4fce7a | 696 | ret = IPT_MATCH_ITERATE(e, find_check_match, &mtpar, &j); |
1da177e4 LT |
697 | if (ret != 0) |
698 | goto cleanup_matches; | |
699 | ||
700 | t = ipt_get_target(e); | |
2e4e6a17 | 701 | target = try_then_request_module(xt_find_target(AF_INET, |
4b478248 PM |
702 | t->u.user.name, |
703 | t->u.user.revision), | |
1da177e4 LT |
704 | "ipt_%s", t->u.user.name); |
705 | if (IS_ERR(target) || !target) { | |
a96be246 | 706 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
1da177e4 LT |
707 | ret = target ? PTR_ERR(target) : -ENOENT; |
708 | goto cleanup_matches; | |
709 | } | |
710 | t->u.kernel.target = target; | |
711 | ||
a96be246 | 712 | ret = check_target(e, name); |
3cdc7c95 PM |
713 | if (ret) |
714 | goto err; | |
715 | ||
1da177e4 LT |
716 | (*i)++; |
717 | return 0; | |
3cdc7c95 PM |
718 | err: |
719 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
720 | cleanup_matches: |
721 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
722 | return ret; | |
723 | } | |
724 | ||
022748a9 | 725 | static int |
1da177e4 | 726 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 727 | struct xt_table_info *newinfo, |
1da177e4 LT |
728 | unsigned char *base, |
729 | unsigned char *limit, | |
730 | const unsigned int *hook_entries, | |
731 | const unsigned int *underflows, | |
732 | unsigned int *i) | |
733 | { | |
734 | unsigned int h; | |
735 | ||
736 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 | |
737 | || (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { | |
738 | duprintf("Bad offset %p\n", e); | |
739 | return -EINVAL; | |
740 | } | |
741 | ||
742 | if (e->next_offset | |
743 | < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) { | |
744 | duprintf("checking: element %p size %u\n", | |
745 | e, e->next_offset); | |
746 | return -EINVAL; | |
747 | } | |
748 | ||
749 | /* Check hooks & underflows */ | |
6e23ae2a | 750 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
1da177e4 LT |
751 | if ((unsigned char *)e - base == hook_entries[h]) |
752 | newinfo->hook_entry[h] = hook_entries[h]; | |
753 | if ((unsigned char *)e - base == underflows[h]) | |
754 | newinfo->underflow[h] = underflows[h]; | |
755 | } | |
756 | ||
757 | /* FIXME: underflows must be unconditional, standard verdicts | |
e905a9ed | 758 | < 0 (not IPT_RETURN). --RR */ |
1da177e4 LT |
759 | |
760 | /* Clear counters and comefrom */ | |
2e4e6a17 | 761 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
762 | e->comefrom = 0; |
763 | ||
764 | (*i)++; | |
765 | return 0; | |
766 | } | |
767 | ||
022748a9 | 768 | static int |
1da177e4 LT |
769 | cleanup_entry(struct ipt_entry *e, unsigned int *i) |
770 | { | |
a2df1648 | 771 | struct xt_tgdtor_param par; |
1da177e4 LT |
772 | struct ipt_entry_target *t; |
773 | ||
774 | if (i && (*i)-- == 0) | |
775 | return 1; | |
776 | ||
777 | /* Cleanup all matches */ | |
778 | IPT_MATCH_ITERATE(e, cleanup_match, NULL); | |
779 | t = ipt_get_target(e); | |
a2df1648 JE |
780 | |
781 | par.target = t->u.kernel.target; | |
782 | par.targinfo = t->data; | |
916a917d | 783 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
784 | if (par.target->destroy != NULL) |
785 | par.target->destroy(&par); | |
786 | module_put(par.target->me); | |
1da177e4 LT |
787 | return 0; |
788 | } | |
789 | ||
790 | /* Checks and translates the user-supplied table segment (held in | |
791 | newinfo) */ | |
792 | static int | |
793 | translate_table(const char *name, | |
794 | unsigned int valid_hooks, | |
2e4e6a17 | 795 | struct xt_table_info *newinfo, |
31836064 | 796 | void *entry0, |
1da177e4 LT |
797 | unsigned int size, |
798 | unsigned int number, | |
799 | const unsigned int *hook_entries, | |
800 | const unsigned int *underflows) | |
801 | { | |
802 | unsigned int i; | |
803 | int ret; | |
804 | ||
805 | newinfo->size = size; | |
806 | newinfo->number = number; | |
807 | ||
808 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 809 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
810 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
811 | newinfo->underflow[i] = 0xFFFFFFFF; | |
812 | } | |
813 | ||
814 | duprintf("translate_table: size %u\n", newinfo->size); | |
815 | i = 0; | |
816 | /* Walk through entries, checking offsets. */ | |
31836064 | 817 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
818 | check_entry_size_and_hooks, |
819 | newinfo, | |
31836064 ED |
820 | entry0, |
821 | entry0 + size, | |
1da177e4 LT |
822 | hook_entries, underflows, &i); |
823 | if (ret != 0) | |
824 | return ret; | |
825 | ||
826 | if (i != number) { | |
827 | duprintf("translate_table: %u not %u entries\n", | |
828 | i, number); | |
829 | return -EINVAL; | |
830 | } | |
831 | ||
832 | /* Check hooks all assigned */ | |
6e23ae2a | 833 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
834 | /* Only hooks which are valid */ |
835 | if (!(valid_hooks & (1 << i))) | |
836 | continue; | |
837 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
838 | duprintf("Invalid hook entry %u %u\n", | |
839 | i, hook_entries[i]); | |
840 | return -EINVAL; | |
841 | } | |
842 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
843 | duprintf("Invalid underflow %u %u\n", | |
844 | i, underflows[i]); | |
845 | return -EINVAL; | |
846 | } | |
847 | } | |
848 | ||
74c9c0c1 DM |
849 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
850 | return -ELOOP; | |
851 | ||
1da177e4 LT |
852 | /* Finally, each sanity check must pass */ |
853 | i = 0; | |
31836064 | 854 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
a96be246 | 855 | find_check_entry, name, size, &i); |
1da177e4 | 856 | |
74c9c0c1 DM |
857 | if (ret != 0) { |
858 | IPT_ENTRY_ITERATE(entry0, newinfo->size, | |
859 | cleanup_entry, &i); | |
860 | return ret; | |
861 | } | |
1da177e4 LT |
862 | |
863 | /* And one copy for every other CPU */ | |
6f912042 | 864 | for_each_possible_cpu(i) { |
31836064 ED |
865 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
866 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
867 | } |
868 | ||
869 | return ret; | |
870 | } | |
871 | ||
1da177e4 LT |
872 | /* Gets counters. */ |
873 | static inline int | |
874 | add_entry_to_counter(const struct ipt_entry *e, | |
2e4e6a17 | 875 | struct xt_counters total[], |
1da177e4 LT |
876 | unsigned int *i) |
877 | { | |
878 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
879 | ||
880 | (*i)++; | |
881 | return 0; | |
882 | } | |
883 | ||
31836064 ED |
884 | static inline int |
885 | set_entry_to_counter(const struct ipt_entry *e, | |
886 | struct ipt_counters total[], | |
887 | unsigned int *i) | |
888 | { | |
889 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
890 | ||
891 | (*i)++; | |
892 | return 0; | |
893 | } | |
894 | ||
1da177e4 | 895 | static void |
2e4e6a17 HW |
896 | get_counters(const struct xt_table_info *t, |
897 | struct xt_counters counters[]) | |
1da177e4 LT |
898 | { |
899 | unsigned int cpu; | |
900 | unsigned int i; | |
31836064 ED |
901 | unsigned int curcpu; |
902 | ||
903 | /* Instead of clearing (by a previous call to memset()) | |
904 | * the counters and using adds, we set the counters | |
905 | * with data used by 'current' CPU | |
906 | * We dont care about preemption here. | |
907 | */ | |
908 | curcpu = raw_smp_processor_id(); | |
909 | ||
910 | i = 0; | |
911 | IPT_ENTRY_ITERATE(t->entries[curcpu], | |
912 | t->size, | |
913 | set_entry_to_counter, | |
914 | counters, | |
915 | &i); | |
1da177e4 | 916 | |
6f912042 | 917 | for_each_possible_cpu(cpu) { |
31836064 ED |
918 | if (cpu == curcpu) |
919 | continue; | |
1da177e4 | 920 | i = 0; |
31836064 | 921 | IPT_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
922 | t->size, |
923 | add_entry_to_counter, | |
924 | counters, | |
925 | &i); | |
926 | } | |
927 | } | |
928 | ||
022748a9 | 929 | static struct xt_counters * alloc_counters(struct xt_table *table) |
1da177e4 | 930 | { |
2722971c | 931 | unsigned int countersize; |
2e4e6a17 | 932 | struct xt_counters *counters; |
5452e425 | 933 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
934 | |
935 | /* We need atomic snapshot of counters: rest doesn't change | |
936 | (other than comefrom, which userspace doesn't care | |
937 | about). */ | |
2e4e6a17 | 938 | countersize = sizeof(struct xt_counters) * private->number; |
31836064 | 939 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
940 | |
941 | if (counters == NULL) | |
2722971c | 942 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
943 | |
944 | /* First, sum counters... */ | |
1da177e4 | 945 | write_lock_bh(&table->lock); |
2e4e6a17 | 946 | get_counters(private, counters); |
1da177e4 LT |
947 | write_unlock_bh(&table->lock); |
948 | ||
2722971c DM |
949 | return counters; |
950 | } | |
951 | ||
952 | static int | |
953 | copy_entries_to_user(unsigned int total_size, | |
e60a13e0 | 954 | struct xt_table *table, |
2722971c DM |
955 | void __user *userptr) |
956 | { | |
957 | unsigned int off, num; | |
958 | struct ipt_entry *e; | |
959 | struct xt_counters *counters; | |
5452e425 | 960 | const struct xt_table_info *private = table->private; |
2722971c | 961 | int ret = 0; |
5452e425 | 962 | const void *loc_cpu_entry; |
2722971c DM |
963 | |
964 | counters = alloc_counters(table); | |
965 | if (IS_ERR(counters)) | |
966 | return PTR_ERR(counters); | |
967 | ||
31836064 ED |
968 | /* choose the copy that is on our node/cpu, ... |
969 | * This choice is lazy (because current thread is | |
970 | * allowed to migrate to another cpu) | |
971 | */ | |
2e4e6a17 | 972 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 973 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
974 | ret = -EFAULT; |
975 | goto free_counters; | |
976 | } | |
977 | ||
978 | /* FIXME: use iterator macros --RR */ | |
979 | /* ... then go back and fix counters and names */ | |
980 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
981 | unsigned int i; | |
5452e425 JE |
982 | const struct ipt_entry_match *m; |
983 | const struct ipt_entry_target *t; | |
1da177e4 | 984 | |
31836064 | 985 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
986 | if (copy_to_user(userptr + off |
987 | + offsetof(struct ipt_entry, counters), | |
988 | &counters[num], | |
989 | sizeof(counters[num])) != 0) { | |
990 | ret = -EFAULT; | |
991 | goto free_counters; | |
992 | } | |
993 | ||
994 | for (i = sizeof(struct ipt_entry); | |
995 | i < e->target_offset; | |
996 | i += m->u.match_size) { | |
997 | m = (void *)e + i; | |
998 | ||
999 | if (copy_to_user(userptr + off + i | |
1000 | + offsetof(struct ipt_entry_match, | |
1001 | u.user.name), | |
1002 | m->u.kernel.match->name, | |
1003 | strlen(m->u.kernel.match->name)+1) | |
1004 | != 0) { | |
1005 | ret = -EFAULT; | |
1006 | goto free_counters; | |
1007 | } | |
1008 | } | |
1009 | ||
1010 | t = ipt_get_target(e); | |
1011 | if (copy_to_user(userptr + off + e->target_offset | |
1012 | + offsetof(struct ipt_entry_target, | |
1013 | u.user.name), | |
1014 | t->u.kernel.target->name, | |
1015 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1016 | ret = -EFAULT; | |
1017 | goto free_counters; | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | free_counters: | |
1022 | vfree(counters); | |
1023 | return ret; | |
1024 | } | |
1025 | ||
2722971c | 1026 | #ifdef CONFIG_COMPAT |
9fa492cd | 1027 | static void compat_standard_from_user(void *dst, void *src) |
2722971c | 1028 | { |
9fa492cd | 1029 | int v = *(compat_int_t *)src; |
2722971c | 1030 | |
9fa492cd | 1031 | if (v > 0) |
b386d9f5 | 1032 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1033 | memcpy(dst, &v, sizeof(v)); |
1034 | } | |
46c5ea3c | 1035 | |
9fa492cd | 1036 | static int compat_standard_to_user(void __user *dst, void *src) |
2722971c | 1037 | { |
9fa492cd | 1038 | compat_int_t cv = *(int *)src; |
2722971c | 1039 | |
9fa492cd | 1040 | if (cv > 0) |
b386d9f5 | 1041 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1042 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1043 | } |
1044 | ||
1045 | static inline int | |
4b478248 | 1046 | compat_calc_match(struct ipt_entry_match *m, int *size) |
2722971c | 1047 | { |
9fa492cd | 1048 | *size += xt_compat_match_offset(m->u.kernel.match); |
2722971c DM |
1049 | return 0; |
1050 | } | |
1051 | ||
259d4e41 | 1052 | static int compat_calc_entry(struct ipt_entry *e, |
4b478248 PM |
1053 | const struct xt_table_info *info, |
1054 | void *base, struct xt_table_info *newinfo) | |
2722971c DM |
1055 | { |
1056 | struct ipt_entry_target *t; | |
e5b5ef7d | 1057 | unsigned int entry_offset; |
2722971c DM |
1058 | int off, i, ret; |
1059 | ||
30c08c41 | 1060 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1061 | entry_offset = (void *)e - base; |
1062 | IPT_MATCH_ITERATE(e, compat_calc_match, &off); | |
1063 | t = ipt_get_target(e); | |
9fa492cd | 1064 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1065 | newinfo->size -= off; |
b386d9f5 | 1066 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1067 | if (ret) |
1068 | return ret; | |
1069 | ||
6e23ae2a | 1070 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1071 | if (info->hook_entry[i] && |
1072 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1073 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1074 | if (info->underflow[i] && |
1075 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1076 | newinfo->underflow[i] -= off; |
1077 | } | |
1078 | return 0; | |
1079 | } | |
1080 | ||
259d4e41 | 1081 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1082 | struct xt_table_info *newinfo) |
2722971c DM |
1083 | { |
1084 | void *loc_cpu_entry; | |
2722971c DM |
1085 | |
1086 | if (!newinfo || !info) | |
1087 | return -EINVAL; | |
1088 | ||
259d4e41 ED |
1089 | /* we dont care about newinfo->entries[] */ |
1090 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1091 | newinfo->initial_entries = 0; | |
2722971c DM |
1092 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
1093 | return IPT_ENTRY_ITERATE(loc_cpu_entry, info->size, | |
4b478248 PM |
1094 | compat_calc_entry, info, loc_cpu_entry, |
1095 | newinfo); | |
2722971c DM |
1096 | } |
1097 | #endif | |
1098 | ||
34bd137b | 1099 | static int get_info(struct net *net, void __user *user, int *len, int compat) |
2722971c DM |
1100 | { |
1101 | char name[IPT_TABLE_MAXNAMELEN]; | |
e60a13e0 | 1102 | struct xt_table *t; |
2722971c DM |
1103 | int ret; |
1104 | ||
1105 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1106 | duprintf("length %u != %zu\n", *len, |
1107 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1108 | return -EINVAL; |
1109 | } | |
1110 | ||
1111 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1112 | return -EFAULT; | |
1113 | ||
1114 | name[IPT_TABLE_MAXNAMELEN-1] = '\0'; | |
1115 | #ifdef CONFIG_COMPAT | |
1116 | if (compat) | |
1117 | xt_compat_lock(AF_INET); | |
1118 | #endif | |
34bd137b | 1119 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1120 | "iptable_%s", name); |
2722971c DM |
1121 | if (t && !IS_ERR(t)) { |
1122 | struct ipt_getinfo info; | |
5452e425 | 1123 | const struct xt_table_info *private = t->private; |
2722971c DM |
1124 | |
1125 | #ifdef CONFIG_COMPAT | |
1126 | if (compat) { | |
1127 | struct xt_table_info tmp; | |
1128 | ret = compat_table_info(private, &tmp); | |
b386d9f5 | 1129 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1130 | private = &tmp; |
2722971c DM |
1131 | } |
1132 | #endif | |
1133 | info.valid_hooks = t->valid_hooks; | |
1134 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1135 | sizeof(info.hook_entry)); |
2722971c | 1136 | memcpy(info.underflow, private->underflow, |
4b478248 | 1137 | sizeof(info.underflow)); |
2722971c DM |
1138 | info.num_entries = private->number; |
1139 | info.size = private->size; | |
1140 | strcpy(info.name, name); | |
1141 | ||
1142 | if (copy_to_user(user, &info, *len) != 0) | |
1143 | ret = -EFAULT; | |
1144 | else | |
1145 | ret = 0; | |
1146 | ||
1147 | xt_table_unlock(t); | |
1148 | module_put(t->me); | |
1149 | } else | |
1150 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1151 | #ifdef CONFIG_COMPAT | |
1152 | if (compat) | |
1153 | xt_compat_unlock(AF_INET); | |
1154 | #endif | |
1155 | return ret; | |
1156 | } | |
1157 | ||
1158 | static int | |
34bd137b | 1159 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, int *len) |
2722971c DM |
1160 | { |
1161 | int ret; | |
1162 | struct ipt_get_entries get; | |
e60a13e0 | 1163 | struct xt_table *t; |
2722971c DM |
1164 | |
1165 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1166 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1167 | return -EINVAL; |
1168 | } | |
1169 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1170 | return -EFAULT; | |
1171 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1172 | duprintf("get_entries: %u != %zu\n", |
1173 | *len, sizeof(get) + get.size); | |
2722971c DM |
1174 | return -EINVAL; |
1175 | } | |
1176 | ||
34bd137b | 1177 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1178 | if (t && !IS_ERR(t)) { |
5452e425 | 1179 | const struct xt_table_info *private = t->private; |
9c547959 | 1180 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1181 | if (get.size == private->size) |
1182 | ret = copy_entries_to_user(private->size, | |
1183 | t, uptr->entrytable); | |
1184 | else { | |
1185 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1186 | private->size, get.size); |
544473c1 | 1187 | ret = -EAGAIN; |
2722971c DM |
1188 | } |
1189 | module_put(t->me); | |
1190 | xt_table_unlock(t); | |
1191 | } else | |
1192 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1193 | ||
1194 | return ret; | |
1195 | } | |
1196 | ||
1197 | static int | |
34bd137b | 1198 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1199 | struct xt_table_info *newinfo, unsigned int num_counters, |
1200 | void __user *counters_ptr) | |
2722971c DM |
1201 | { |
1202 | int ret; | |
e60a13e0 | 1203 | struct xt_table *t; |
2722971c DM |
1204 | struct xt_table_info *oldinfo; |
1205 | struct xt_counters *counters; | |
1206 | void *loc_cpu_old_entry; | |
1207 | ||
1208 | ret = 0; | |
1209 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); | |
1210 | if (!counters) { | |
1211 | ret = -ENOMEM; | |
1212 | goto out; | |
1213 | } | |
1214 | ||
34bd137b | 1215 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c DM |
1216 | "iptable_%s", name); |
1217 | if (!t || IS_ERR(t)) { | |
1218 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1219 | goto free_newinfo_counters_untrans; | |
1220 | } | |
1221 | ||
1222 | /* You lied! */ | |
1223 | if (valid_hooks != t->valid_hooks) { | |
1224 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1225 | valid_hooks, t->valid_hooks); | |
1226 | ret = -EINVAL; | |
1227 | goto put_module; | |
1228 | } | |
1229 | ||
1230 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1231 | if (!oldinfo) | |
1232 | goto put_module; | |
1233 | ||
1234 | /* Update module usage count based on number of rules */ | |
1235 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1236 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1237 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1238 | (newinfo->number <= oldinfo->initial_entries)) | |
1239 | module_put(t->me); | |
1240 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1241 | (newinfo->number <= oldinfo->initial_entries)) | |
1242 | module_put(t->me); | |
1243 | ||
1244 | /* Get the old counters. */ | |
1245 | get_counters(oldinfo, counters); | |
1246 | /* Decrease module usage counts and free resource */ | |
1247 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
4b478248 PM |
1248 | IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry, |
1249 | NULL); | |
2722971c DM |
1250 | xt_free_table_info(oldinfo); |
1251 | if (copy_to_user(counters_ptr, counters, | |
1252 | sizeof(struct xt_counters) * num_counters) != 0) | |
1253 | ret = -EFAULT; | |
1254 | vfree(counters); | |
1255 | xt_table_unlock(t); | |
1256 | return ret; | |
1257 | ||
1258 | put_module: | |
1259 | module_put(t->me); | |
1260 | xt_table_unlock(t); | |
1261 | free_newinfo_counters_untrans: | |
1262 | vfree(counters); | |
1263 | out: | |
1264 | return ret; | |
1265 | } | |
1266 | ||
1267 | static int | |
34bd137b | 1268 | do_replace(struct net *net, void __user *user, unsigned int len) |
2722971c DM |
1269 | { |
1270 | int ret; | |
1271 | struct ipt_replace tmp; | |
1272 | struct xt_table_info *newinfo; | |
1273 | void *loc_cpu_entry; | |
1274 | ||
1275 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1276 | return -EFAULT; | |
1277 | ||
2722971c | 1278 | /* overflow check */ |
2722971c DM |
1279 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1280 | return -ENOMEM; | |
1281 | ||
1282 | newinfo = xt_alloc_table_info(tmp.size); | |
1283 | if (!newinfo) | |
1284 | return -ENOMEM; | |
1285 | ||
9c547959 | 1286 | /* choose the copy that is on our node/cpu */ |
2722971c DM |
1287 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1288 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1289 | tmp.size) != 0) { | |
1290 | ret = -EFAULT; | |
1291 | goto free_newinfo; | |
1292 | } | |
1293 | ||
1294 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
1295 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, | |
1296 | tmp.hook_entry, tmp.underflow); | |
1297 | if (ret != 0) | |
1298 | goto free_newinfo; | |
1299 | ||
1300 | duprintf("ip_tables: Translated table\n"); | |
1301 | ||
34bd137b | 1302 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1303 | tmp.num_counters, tmp.counters); |
2722971c DM |
1304 | if (ret) |
1305 | goto free_newinfo_untrans; | |
1306 | return 0; | |
1307 | ||
1308 | free_newinfo_untrans: | |
9c547959 | 1309 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
2722971c DM |
1310 | free_newinfo: |
1311 | xt_free_table_info(newinfo); | |
1312 | return ret; | |
1313 | } | |
1314 | ||
1315 | /* We're lazy, and add to the first CPU; overflow works its fey magic | |
1316 | * and everything is OK. */ | |
022748a9 | 1317 | static int |
2722971c DM |
1318 | add_counter_to_entry(struct ipt_entry *e, |
1319 | const struct xt_counters addme[], | |
1320 | unsigned int *i) | |
1321 | { | |
1322 | #if 0 | |
1323 | duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n", | |
1324 | *i, | |
1325 | (long unsigned int)e->counters.pcnt, | |
1326 | (long unsigned int)e->counters.bcnt, | |
1327 | (long unsigned int)addme[*i].pcnt, | |
1328 | (long unsigned int)addme[*i].bcnt); | |
1329 | #endif | |
1330 | ||
1331 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1332 | ||
1333 | (*i)++; | |
1334 | return 0; | |
1335 | } | |
1336 | ||
1337 | static int | |
34bd137b | 1338 | do_add_counters(struct net *net, void __user *user, unsigned int len, int compat) |
2722971c DM |
1339 | { |
1340 | unsigned int i; | |
1341 | struct xt_counters_info tmp; | |
1342 | struct xt_counters *paddc; | |
1343 | unsigned int num_counters; | |
5452e425 | 1344 | const char *name; |
2722971c DM |
1345 | int size; |
1346 | void *ptmp; | |
e60a13e0 | 1347 | struct xt_table *t; |
5452e425 | 1348 | const struct xt_table_info *private; |
2722971c DM |
1349 | int ret = 0; |
1350 | void *loc_cpu_entry; | |
1351 | #ifdef CONFIG_COMPAT | |
1352 | struct compat_xt_counters_info compat_tmp; | |
1353 | ||
1354 | if (compat) { | |
1355 | ptmp = &compat_tmp; | |
1356 | size = sizeof(struct compat_xt_counters_info); | |
1357 | } else | |
1358 | #endif | |
1359 | { | |
1360 | ptmp = &tmp; | |
1361 | size = sizeof(struct xt_counters_info); | |
1362 | } | |
1363 | ||
1364 | if (copy_from_user(ptmp, user, size) != 0) | |
1365 | return -EFAULT; | |
1366 | ||
1367 | #ifdef CONFIG_COMPAT | |
1368 | if (compat) { | |
1369 | num_counters = compat_tmp.num_counters; | |
1370 | name = compat_tmp.name; | |
1371 | } else | |
1372 | #endif | |
1373 | { | |
1374 | num_counters = tmp.num_counters; | |
1375 | name = tmp.name; | |
1376 | } | |
1377 | ||
1378 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1379 | return -EINVAL; | |
1380 | ||
1381 | paddc = vmalloc_node(len - size, numa_node_id()); | |
1382 | if (!paddc) | |
1383 | return -ENOMEM; | |
1384 | ||
1385 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1386 | ret = -EFAULT; | |
1387 | goto free; | |
1388 | } | |
1389 | ||
34bd137b | 1390 | t = xt_find_table_lock(net, AF_INET, name); |
2722971c DM |
1391 | if (!t || IS_ERR(t)) { |
1392 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1393 | goto free; | |
1394 | } | |
1395 | ||
1396 | write_lock_bh(&t->lock); | |
1397 | private = t->private; | |
1398 | if (private->number != num_counters) { | |
1399 | ret = -EINVAL; | |
1400 | goto unlock_up_free; | |
1401 | } | |
1402 | ||
1403 | i = 0; | |
1404 | /* Choose the copy that is on our node */ | |
1405 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1406 | IPT_ENTRY_ITERATE(loc_cpu_entry, | |
1407 | private->size, | |
1408 | add_counter_to_entry, | |
1409 | paddc, | |
1410 | &i); | |
1411 | unlock_up_free: | |
1412 | write_unlock_bh(&t->lock); | |
1413 | xt_table_unlock(t); | |
1414 | module_put(t->me); | |
1415 | free: | |
1416 | vfree(paddc); | |
1417 | ||
1418 | return ret; | |
1419 | } | |
1420 | ||
1421 | #ifdef CONFIG_COMPAT | |
1422 | struct compat_ipt_replace { | |
1423 | char name[IPT_TABLE_MAXNAMELEN]; | |
1424 | u32 valid_hooks; | |
1425 | u32 num_entries; | |
1426 | u32 size; | |
6e23ae2a PM |
1427 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1428 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c DM |
1429 | u32 num_counters; |
1430 | compat_uptr_t counters; /* struct ipt_counters * */ | |
1431 | struct compat_ipt_entry entries[0]; | |
1432 | }; | |
1433 | ||
a18aa31b PM |
1434 | static int |
1435 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1436 | unsigned int *size, struct xt_counters *counters, |
a18aa31b | 1437 | unsigned int *i) |
2722971c | 1438 | { |
3e597c60 | 1439 | struct ipt_entry_target *t; |
2722971c DM |
1440 | struct compat_ipt_entry __user *ce; |
1441 | u_int16_t target_offset, next_offset; | |
1442 | compat_uint_t origsize; | |
1443 | int ret; | |
1444 | ||
1445 | ret = -EFAULT; | |
1446 | origsize = *size; | |
1447 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
7800007c | 1448 | if (copy_to_user(ce, e, sizeof(struct ipt_entry))) |
2722971c DM |
1449 | goto out; |
1450 | ||
a18aa31b PM |
1451 | if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i]))) |
1452 | goto out; | |
1453 | ||
2722971c | 1454 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1455 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1456 | ||
ac8e27fd | 1457 | ret = IPT_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size); |
2722971c DM |
1458 | target_offset = e->target_offset - (origsize - *size); |
1459 | if (ret) | |
1460 | goto out; | |
1461 | t = ipt_get_target(e); | |
9fa492cd | 1462 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c DM |
1463 | if (ret) |
1464 | goto out; | |
1465 | ret = -EFAULT; | |
1466 | next_offset = e->next_offset - (origsize - *size); | |
7800007c | 1467 | if (put_user(target_offset, &ce->target_offset)) |
2722971c | 1468 | goto out; |
7800007c | 1469 | if (put_user(next_offset, &ce->next_offset)) |
2722971c | 1470 | goto out; |
a18aa31b PM |
1471 | |
1472 | (*i)++; | |
2722971c DM |
1473 | return 0; |
1474 | out: | |
1475 | return ret; | |
1476 | } | |
1477 | ||
022748a9 | 1478 | static int |
4c1b52bc | 1479 | compat_find_calc_match(struct ipt_entry_match *m, |
4b478248 PM |
1480 | const char *name, |
1481 | const struct ipt_ip *ip, | |
1482 | unsigned int hookmask, | |
b0a6363c | 1483 | int *size, unsigned int *i) |
2722971c | 1484 | { |
6709dbbb | 1485 | struct xt_match *match; |
2722971c DM |
1486 | |
1487 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, | |
4b478248 | 1488 | m->u.user.revision), |
2722971c DM |
1489 | "ipt_%s", m->u.user.name); |
1490 | if (IS_ERR(match) || !match) { | |
1491 | duprintf("compat_check_calc_match: `%s' not found\n", | |
4b478248 | 1492 | m->u.user.name); |
2722971c DM |
1493 | return match ? PTR_ERR(match) : -ENOENT; |
1494 | } | |
1495 | m->u.kernel.match = match; | |
9fa492cd | 1496 | *size += xt_compat_match_offset(match); |
2722971c DM |
1497 | |
1498 | (*i)++; | |
1499 | return 0; | |
1500 | } | |
1501 | ||
022748a9 | 1502 | static int |
4c1b52bc DM |
1503 | compat_release_match(struct ipt_entry_match *m, unsigned int *i) |
1504 | { | |
1505 | if (i && (*i)-- == 0) | |
1506 | return 1; | |
1507 | ||
1508 | module_put(m->u.kernel.match->me); | |
1509 | return 0; | |
1510 | } | |
1511 | ||
022748a9 | 1512 | static int |
73cd598d | 1513 | compat_release_entry(struct compat_ipt_entry *e, unsigned int *i) |
4c1b52bc DM |
1514 | { |
1515 | struct ipt_entry_target *t; | |
1516 | ||
1517 | if (i && (*i)-- == 0) | |
1518 | return 1; | |
1519 | ||
1520 | /* Cleanup all matches */ | |
73cd598d PM |
1521 | COMPAT_IPT_MATCH_ITERATE(e, compat_release_match, NULL); |
1522 | t = compat_ipt_get_target(e); | |
4c1b52bc DM |
1523 | module_put(t->u.kernel.target->me); |
1524 | return 0; | |
1525 | } | |
1526 | ||
022748a9 | 1527 | static int |
73cd598d | 1528 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1529 | struct xt_table_info *newinfo, |
1530 | unsigned int *size, | |
1531 | unsigned char *base, | |
1532 | unsigned char *limit, | |
1533 | unsigned int *hook_entries, | |
1534 | unsigned int *underflows, | |
1535 | unsigned int *i, | |
1536 | const char *name) | |
2722971c DM |
1537 | { |
1538 | struct ipt_entry_target *t; | |
6709dbbb | 1539 | struct xt_target *target; |
e5b5ef7d | 1540 | unsigned int entry_offset; |
b0a6363c PM |
1541 | unsigned int j; |
1542 | int ret, off, h; | |
2722971c DM |
1543 | |
1544 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
1545 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 | |
1546 | || (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { | |
1547 | duprintf("Bad offset %p, limit = %p\n", e, limit); | |
1548 | return -EINVAL; | |
1549 | } | |
1550 | ||
1551 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1552 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1553 | duprintf("checking: element %p size %u\n", |
1554 | e, e->next_offset); | |
1555 | return -EINVAL; | |
1556 | } | |
1557 | ||
73cd598d PM |
1558 | /* For purposes of check_entry casting the compat entry is fine */ |
1559 | ret = check_entry((struct ipt_entry *)e, name); | |
a96be246 DM |
1560 | if (ret) |
1561 | return ret; | |
590bdf7f | 1562 | |
30c08c41 | 1563 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1564 | entry_offset = (void *)e - (void *)base; |
1565 | j = 0; | |
73cd598d PM |
1566 | ret = COMPAT_IPT_MATCH_ITERATE(e, compat_find_calc_match, name, |
1567 | &e->ip, e->comefrom, &off, &j); | |
2722971c | 1568 | if (ret != 0) |
4c1b52bc | 1569 | goto release_matches; |
2722971c | 1570 | |
73cd598d | 1571 | t = compat_ipt_get_target(e); |
2722971c | 1572 | target = try_then_request_module(xt_find_target(AF_INET, |
4b478248 PM |
1573 | t->u.user.name, |
1574 | t->u.user.revision), | |
2722971c DM |
1575 | "ipt_%s", t->u.user.name); |
1576 | if (IS_ERR(target) || !target) { | |
a96be246 | 1577 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1578 | t->u.user.name); |
2722971c | 1579 | ret = target ? PTR_ERR(target) : -ENOENT; |
4c1b52bc | 1580 | goto release_matches; |
2722971c DM |
1581 | } |
1582 | t->u.kernel.target = target; | |
1583 | ||
9fa492cd | 1584 | off += xt_compat_target_offset(target); |
2722971c | 1585 | *size += off; |
b386d9f5 | 1586 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1587 | if (ret) |
1588 | goto out; | |
1589 | ||
1590 | /* Check hooks & underflows */ | |
6e23ae2a | 1591 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1592 | if ((unsigned char *)e - base == hook_entries[h]) |
1593 | newinfo->hook_entry[h] = hook_entries[h]; | |
1594 | if ((unsigned char *)e - base == underflows[h]) | |
1595 | newinfo->underflow[h] = underflows[h]; | |
1596 | } | |
1597 | ||
1598 | /* Clear counters and comefrom */ | |
73cd598d | 1599 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c DM |
1600 | e->comefrom = 0; |
1601 | ||
1602 | (*i)++; | |
1603 | return 0; | |
bec71b16 | 1604 | |
2722971c | 1605 | out: |
bec71b16 | 1606 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1607 | release_matches: |
1608 | IPT_MATCH_ITERATE(e, compat_release_match, &j); | |
2722971c DM |
1609 | return ret; |
1610 | } | |
1611 | ||
4b478248 | 1612 | static int |
73cd598d | 1613 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1614 | unsigned int *size, const char *name, |
1615 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c DM |
1616 | { |
1617 | struct ipt_entry_target *t; | |
6709dbbb | 1618 | struct xt_target *target; |
2722971c DM |
1619 | struct ipt_entry *de; |
1620 | unsigned int origsize; | |
920b868a | 1621 | int ret, h; |
2722971c DM |
1622 | |
1623 | ret = 0; | |
1624 | origsize = *size; | |
1625 | de = (struct ipt_entry *)*dstptr; | |
1626 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1627 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1628 | |
73cd598d | 1629 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1630 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1631 | ||
73cd598d PM |
1632 | ret = COMPAT_IPT_MATCH_ITERATE(e, xt_compat_match_from_user, |
1633 | dstptr, size); | |
2722971c | 1634 | if (ret) |
f6677f43 | 1635 | return ret; |
2722971c | 1636 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1637 | t = compat_ipt_get_target(e); |
2722971c | 1638 | target = t->u.kernel.target; |
9fa492cd | 1639 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1640 | |
1641 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1642 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1643 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1644 | newinfo->hook_entry[h] -= origsize - *size; | |
1645 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1646 | newinfo->underflow[h] -= origsize - *size; | |
1647 | } | |
f6677f43 DM |
1648 | return ret; |
1649 | } | |
1650 | ||
022748a9 DV |
1651 | static int |
1652 | compat_check_entry(struct ipt_entry *e, const char *name, | |
4b478248 | 1653 | unsigned int *i) |
f6677f43 | 1654 | { |
9b4fce7a | 1655 | struct xt_mtchk_param mtpar; |
b0a6363c PM |
1656 | unsigned int j; |
1657 | int ret; | |
f6677f43 | 1658 | |
4c1b52bc | 1659 | j = 0; |
9b4fce7a JE |
1660 | mtpar.table = name; |
1661 | mtpar.entryinfo = &e->ip; | |
1662 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1663 | mtpar.family = NFPROTO_IPV4; |
9b4fce7a | 1664 | ret = IPT_MATCH_ITERATE(e, check_match, &mtpar, &j); |
f6677f43 | 1665 | if (ret) |
4c1b52bc DM |
1666 | goto cleanup_matches; |
1667 | ||
1668 | ret = check_target(e, name); | |
1669 | if (ret) | |
1670 | goto cleanup_matches; | |
f6677f43 | 1671 | |
4c1b52bc DM |
1672 | (*i)++; |
1673 | return 0; | |
1674 | ||
1675 | cleanup_matches: | |
1676 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
1677 | return ret; | |
f6677f43 DM |
1678 | } |
1679 | ||
1da177e4 | 1680 | static int |
2722971c | 1681 | translate_compat_table(const char *name, |
4b478248 PM |
1682 | unsigned int valid_hooks, |
1683 | struct xt_table_info **pinfo, | |
1684 | void **pentry0, | |
1685 | unsigned int total_size, | |
1686 | unsigned int number, | |
1687 | unsigned int *hook_entries, | |
1688 | unsigned int *underflows) | |
1da177e4 | 1689 | { |
920b868a | 1690 | unsigned int i, j; |
2722971c DM |
1691 | struct xt_table_info *newinfo, *info; |
1692 | void *pos, *entry0, *entry1; | |
1693 | unsigned int size; | |
1da177e4 | 1694 | int ret; |
1da177e4 | 1695 | |
2722971c DM |
1696 | info = *pinfo; |
1697 | entry0 = *pentry0; | |
1698 | size = total_size; | |
1699 | info->number = number; | |
1700 | ||
1701 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1702 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1703 | info->hook_entry[i] = 0xFFFFFFFF; |
1704 | info->underflow[i] = 0xFFFFFFFF; | |
1705 | } | |
1706 | ||
1707 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1708 | j = 0; |
2722971c DM |
1709 | xt_compat_lock(AF_INET); |
1710 | /* Walk through entries, checking offsets. */ | |
73cd598d PM |
1711 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
1712 | check_compat_entry_size_and_hooks, | |
1713 | info, &size, entry0, | |
1714 | entry0 + total_size, | |
1715 | hook_entries, underflows, &j, name); | |
2722971c DM |
1716 | if (ret != 0) |
1717 | goto out_unlock; | |
1718 | ||
1719 | ret = -EINVAL; | |
920b868a | 1720 | if (j != number) { |
2722971c | 1721 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1722 | j, number); |
2722971c DM |
1723 | goto out_unlock; |
1724 | } | |
1725 | ||
1726 | /* Check hooks all assigned */ | |
6e23ae2a | 1727 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1728 | /* Only hooks which are valid */ |
1729 | if (!(valid_hooks & (1 << i))) | |
1730 | continue; | |
1731 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1732 | duprintf("Invalid hook entry %u %u\n", | |
1733 | i, hook_entries[i]); | |
1734 | goto out_unlock; | |
1da177e4 | 1735 | } |
2722971c DM |
1736 | if (info->underflow[i] == 0xFFFFFFFF) { |
1737 | duprintf("Invalid underflow %u %u\n", | |
1738 | i, underflows[i]); | |
1739 | goto out_unlock; | |
1740 | } | |
1741 | } | |
1742 | ||
1743 | ret = -ENOMEM; | |
1744 | newinfo = xt_alloc_table_info(size); | |
1745 | if (!newinfo) | |
1746 | goto out_unlock; | |
1747 | ||
1748 | newinfo->number = number; | |
6e23ae2a | 1749 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1750 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1751 | newinfo->underflow[i] = info->underflow[i]; | |
1752 | } | |
1753 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1754 | pos = entry1; | |
4b478248 | 1755 | size = total_size; |
73cd598d | 1756 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
9c547959 PM |
1757 | compat_copy_entry_from_user, |
1758 | &pos, &size, name, newinfo, entry1); | |
b386d9f5 | 1759 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1760 | xt_compat_unlock(AF_INET); |
1761 | if (ret) | |
1762 | goto free_newinfo; | |
1763 | ||
1764 | ret = -ELOOP; | |
1765 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1766 | goto free_newinfo; | |
1767 | ||
4c1b52bc | 1768 | i = 0; |
f6677f43 | 1769 | ret = IPT_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry, |
4b478248 | 1770 | name, &i); |
4c1b52bc DM |
1771 | if (ret) { |
1772 | j -= i; | |
73cd598d PM |
1773 | COMPAT_IPT_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i, |
1774 | compat_release_entry, &j); | |
4c1b52bc DM |
1775 | IPT_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i); |
1776 | xt_free_table_info(newinfo); | |
1777 | return ret; | |
1778 | } | |
f6677f43 | 1779 | |
2722971c | 1780 | /* And one copy for every other CPU */ |
fb1bb34d | 1781 | for_each_possible_cpu(i) |
2722971c DM |
1782 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1783 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1784 | ||
1785 | *pinfo = newinfo; | |
1786 | *pentry0 = entry1; | |
1787 | xt_free_table_info(info); | |
1788 | return 0; | |
1da177e4 | 1789 | |
2722971c DM |
1790 | free_newinfo: |
1791 | xt_free_table_info(newinfo); | |
1792 | out: | |
73cd598d | 1793 | COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j); |
1da177e4 | 1794 | return ret; |
2722971c | 1795 | out_unlock: |
b386d9f5 | 1796 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1797 | xt_compat_unlock(AF_INET); |
1798 | goto out; | |
1da177e4 LT |
1799 | } |
1800 | ||
1801 | static int | |
34bd137b | 1802 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1803 | { |
1804 | int ret; | |
2722971c DM |
1805 | struct compat_ipt_replace tmp; |
1806 | struct xt_table_info *newinfo; | |
1807 | void *loc_cpu_entry; | |
1da177e4 LT |
1808 | |
1809 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1810 | return -EFAULT; | |
1811 | ||
ee4bb818 | 1812 | /* overflow check */ |
259d4e41 | 1813 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1814 | return -ENOMEM; |
1815 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1816 | return -ENOMEM; | |
1817 | ||
2e4e6a17 | 1818 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1819 | if (!newinfo) |
1820 | return -ENOMEM; | |
1821 | ||
9c547959 | 1822 | /* choose the copy that is on our node/cpu */ |
31836064 ED |
1823 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1824 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1825 | tmp.size) != 0) { |
1826 | ret = -EFAULT; | |
1827 | goto free_newinfo; | |
1828 | } | |
1829 | ||
2722971c | 1830 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, |
4b478248 PM |
1831 | &newinfo, &loc_cpu_entry, tmp.size, |
1832 | tmp.num_entries, tmp.hook_entry, | |
1833 | tmp.underflow); | |
2722971c | 1834 | if (ret != 0) |
1da177e4 | 1835 | goto free_newinfo; |
1da177e4 | 1836 | |
2722971c | 1837 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1838 | |
34bd137b | 1839 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1840 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1841 | if (ret) |
1842 | goto free_newinfo_untrans; | |
1843 | return 0; | |
1da177e4 | 1844 | |
2722971c | 1845 | free_newinfo_untrans: |
4b478248 | 1846 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
2722971c DM |
1847 | free_newinfo: |
1848 | xt_free_table_info(newinfo); | |
1849 | return ret; | |
1850 | } | |
1da177e4 | 1851 | |
2722971c DM |
1852 | static int |
1853 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1854 | unsigned int len) |
2722971c DM |
1855 | { |
1856 | int ret; | |
1da177e4 | 1857 | |
2722971c DM |
1858 | if (!capable(CAP_NET_ADMIN)) |
1859 | return -EPERM; | |
1da177e4 | 1860 | |
2722971c DM |
1861 | switch (cmd) { |
1862 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1863 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1864 | break; |
1da177e4 | 1865 | |
2722971c | 1866 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1867 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1868 | break; |
1869 | ||
1870 | default: | |
1871 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1872 | ret = -EINVAL; | |
1873 | } | |
1da177e4 | 1874 | |
1da177e4 LT |
1875 | return ret; |
1876 | } | |
1877 | ||
4b478248 | 1878 | struct compat_ipt_get_entries { |
2722971c DM |
1879 | char name[IPT_TABLE_MAXNAMELEN]; |
1880 | compat_uint_t size; | |
1881 | struct compat_ipt_entry entrytable[0]; | |
1882 | }; | |
1da177e4 | 1883 | |
4b478248 PM |
1884 | static int |
1885 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1886 | void __user *userptr) | |
2722971c | 1887 | { |
2722971c | 1888 | struct xt_counters *counters; |
5452e425 | 1889 | const struct xt_table_info *private = table->private; |
2722971c DM |
1890 | void __user *pos; |
1891 | unsigned int size; | |
1892 | int ret = 0; | |
5452e425 | 1893 | const void *loc_cpu_entry; |
a18aa31b | 1894 | unsigned int i = 0; |
1da177e4 | 1895 | |
2722971c DM |
1896 | counters = alloc_counters(table); |
1897 | if (IS_ERR(counters)) | |
1898 | return PTR_ERR(counters); | |
1899 | ||
1900 | /* choose the copy that is on our node/cpu, ... | |
1901 | * This choice is lazy (because current thread is | |
1902 | * allowed to migrate to another cpu) | |
1903 | */ | |
1904 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1905 | pos = userptr; | |
1906 | size = total_size; | |
1907 | ret = IPT_ENTRY_ITERATE(loc_cpu_entry, total_size, | |
a18aa31b PM |
1908 | compat_copy_entry_to_user, |
1909 | &pos, &size, counters, &i); | |
2722971c | 1910 | |
2722971c DM |
1911 | vfree(counters); |
1912 | return ret; | |
1da177e4 LT |
1913 | } |
1914 | ||
1915 | static int | |
34bd137b AD |
1916 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1917 | int *len) | |
1da177e4 | 1918 | { |
2722971c DM |
1919 | int ret; |
1920 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1921 | struct xt_table *t; |
1da177e4 | 1922 | |
2722971c | 1923 | if (*len < sizeof(get)) { |
c9d8fe13 | 1924 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1925 | return -EINVAL; |
2722971c | 1926 | } |
1da177e4 | 1927 | |
2722971c DM |
1928 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1929 | return -EFAULT; | |
1da177e4 | 1930 | |
2722971c | 1931 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1932 | duprintf("compat_get_entries: %u != %zu\n", |
1933 | *len, sizeof(get) + get.size); | |
2722971c | 1934 | return -EINVAL; |
1da177e4 LT |
1935 | } |
1936 | ||
2722971c | 1937 | xt_compat_lock(AF_INET); |
34bd137b | 1938 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1939 | if (t && !IS_ERR(t)) { |
5452e425 | 1940 | const struct xt_table_info *private = t->private; |
2722971c | 1941 | struct xt_table_info info; |
9c547959 | 1942 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1943 | ret = compat_table_info(private, &info); |
1944 | if (!ret && get.size == info.size) { | |
1945 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 1946 | t, uptr->entrytable); |
2722971c DM |
1947 | } else if (!ret) { |
1948 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1949 | private->size, get.size); |
544473c1 | 1950 | ret = -EAGAIN; |
2722971c | 1951 | } |
b386d9f5 | 1952 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1953 | module_put(t->me); |
1954 | xt_table_unlock(t); | |
1955 | } else | |
1da177e4 | 1956 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1957 | |
2722971c DM |
1958 | xt_compat_unlock(AF_INET); |
1959 | return ret; | |
1960 | } | |
1da177e4 | 1961 | |
79030ed0 PM |
1962 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1963 | ||
2722971c DM |
1964 | static int |
1965 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1966 | { | |
1967 | int ret; | |
1da177e4 | 1968 | |
82fac054 BS |
1969 | if (!capable(CAP_NET_ADMIN)) |
1970 | return -EPERM; | |
1971 | ||
2722971c DM |
1972 | switch (cmd) { |
1973 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1974 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1975 | break; |
1976 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1977 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1978 | break; |
1979 | default: | |
79030ed0 | 1980 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1981 | } |
1da177e4 LT |
1982 | return ret; |
1983 | } | |
2722971c | 1984 | #endif |
1da177e4 LT |
1985 | |
1986 | static int | |
9c547959 | 1987 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
1988 | { |
1989 | int ret; | |
1990 | ||
1991 | if (!capable(CAP_NET_ADMIN)) | |
1992 | return -EPERM; | |
1993 | ||
1994 | switch (cmd) { | |
1995 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1996 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1997 | break; |
1998 | ||
1999 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2000 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2001 | break; |
2002 | ||
2003 | default: | |
2004 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
2005 | ret = -EINVAL; | |
2006 | } | |
2007 | ||
2008 | return ret; | |
2009 | } | |
2010 | ||
2011 | static int | |
2012 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2013 | { | |
2014 | int ret; | |
2015 | ||
2016 | if (!capable(CAP_NET_ADMIN)) | |
2017 | return -EPERM; | |
2018 | ||
2019 | switch (cmd) { | |
2722971c | 2020 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2021 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2022 | break; |
1da177e4 | 2023 | |
2722971c | 2024 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2025 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2026 | break; |
1da177e4 LT |
2027 | |
2028 | case IPT_SO_GET_REVISION_MATCH: | |
2029 | case IPT_SO_GET_REVISION_TARGET: { | |
2030 | struct ipt_get_revision rev; | |
2e4e6a17 | 2031 | int target; |
1da177e4 LT |
2032 | |
2033 | if (*len != sizeof(rev)) { | |
2034 | ret = -EINVAL; | |
2035 | break; | |
2036 | } | |
2037 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2038 | ret = -EFAULT; | |
2039 | break; | |
2040 | } | |
2041 | ||
2042 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2043 | target = 1; |
1da177e4 | 2044 | else |
2e4e6a17 | 2045 | target = 0; |
1da177e4 | 2046 | |
2e4e6a17 HW |
2047 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2048 | rev.revision, | |
2049 | target, &ret), | |
1da177e4 LT |
2050 | "ipt_%s", rev.name); |
2051 | break; | |
2052 | } | |
2053 | ||
2054 | default: | |
2055 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2056 | ret = -EINVAL; | |
2057 | } | |
2058 | ||
2059 | return ret; | |
2060 | } | |
2061 | ||
44d34e72 AD |
2062 | struct xt_table *ipt_register_table(struct net *net, struct xt_table *table, |
2063 | const struct ipt_replace *repl) | |
1da177e4 LT |
2064 | { |
2065 | int ret; | |
2e4e6a17 | 2066 | struct xt_table_info *newinfo; |
259d4e41 | 2067 | struct xt_table_info bootstrap |
1da177e4 | 2068 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2069 | void *loc_cpu_entry; |
a98da11d | 2070 | struct xt_table *new_table; |
1da177e4 | 2071 | |
2e4e6a17 | 2072 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2073 | if (!newinfo) { |
2074 | ret = -ENOMEM; | |
2075 | goto out; | |
2076 | } | |
1da177e4 | 2077 | |
9c547959 | 2078 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2079 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2080 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
2081 | |
2082 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 2083 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
2084 | repl->num_entries, |
2085 | repl->hook_entry, | |
2086 | repl->underflow); | |
44d34e72 AD |
2087 | if (ret != 0) |
2088 | goto out_free; | |
1da177e4 | 2089 | |
44d34e72 | 2090 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2091 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2092 | ret = PTR_ERR(new_table); |
2093 | goto out_free; | |
1da177e4 LT |
2094 | } |
2095 | ||
44d34e72 AD |
2096 | return new_table; |
2097 | ||
2098 | out_free: | |
2099 | xt_free_table_info(newinfo); | |
2100 | out: | |
2101 | return ERR_PTR(ret); | |
1da177e4 LT |
2102 | } |
2103 | ||
e60a13e0 | 2104 | void ipt_unregister_table(struct xt_table *table) |
1da177e4 | 2105 | { |
2e4e6a17 | 2106 | struct xt_table_info *private; |
31836064 | 2107 | void *loc_cpu_entry; |
df200969 | 2108 | struct module *table_owner = table->me; |
31836064 | 2109 | |
e905a9ed | 2110 | private = xt_unregister_table(table); |
1da177e4 LT |
2111 | |
2112 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
2113 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
2114 | IPT_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
df200969 AD |
2115 | if (private->number > private->initial_entries) |
2116 | module_put(table_owner); | |
2e4e6a17 | 2117 | xt_free_table_info(private); |
1da177e4 LT |
2118 | } |
2119 | ||
2120 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2121 | static inline bool |
1da177e4 LT |
2122 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2123 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2124 | bool invert) |
1da177e4 | 2125 | { |
9c547959 PM |
2126 | return ((test_type == 0xFF) || |
2127 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2128 | ^ invert; |
2129 | } | |
2130 | ||
1d93a9cb | 2131 | static bool |
f7108a20 | 2132 | icmp_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2133 | { |
5452e425 JE |
2134 | const struct icmphdr *ic; |
2135 | struct icmphdr _icmph; | |
f7108a20 | 2136 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2137 | |
2138 | /* Must not be a fragment. */ | |
f7108a20 | 2139 | if (par->fragoff != 0) |
1d93a9cb | 2140 | return false; |
1da177e4 | 2141 | |
f7108a20 | 2142 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2143 | if (ic == NULL) { |
2144 | /* We've been asked to examine this packet, and we | |
2145 | * can't. Hence, no choice but to drop. | |
2146 | */ | |
2147 | duprintf("Dropping evil ICMP tinygram.\n"); | |
f7108a20 | 2148 | *par->hotdrop = true; |
1d93a9cb | 2149 | return false; |
1da177e4 LT |
2150 | } |
2151 | ||
2152 | return icmp_type_code_match(icmpinfo->type, | |
2153 | icmpinfo->code[0], | |
2154 | icmpinfo->code[1], | |
2155 | ic->type, ic->code, | |
2156 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2157 | } | |
2158 | ||
9b4fce7a | 2159 | static bool icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2160 | { |
9b4fce7a | 2161 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2162 | |
1d5cd909 PM |
2163 | /* Must specify no unknown invflags */ |
2164 | return !(icmpinfo->invflags & ~IPT_ICMP_INV); | |
1da177e4 LT |
2165 | } |
2166 | ||
2167 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2168 | static struct xt_target ipt_standard_target __read_mostly = { |
1da177e4 | 2169 | .name = IPT_STANDARD_TARGET, |
1d5cd909 | 2170 | .targetsize = sizeof(int), |
a45049c5 | 2171 | .family = AF_INET, |
2722971c | 2172 | #ifdef CONFIG_COMPAT |
9fa492cd PM |
2173 | .compatsize = sizeof(compat_int_t), |
2174 | .compat_from_user = compat_standard_from_user, | |
2175 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2176 | #endif |
1da177e4 LT |
2177 | }; |
2178 | ||
9f15c530 | 2179 | static struct xt_target ipt_error_target __read_mostly = { |
1da177e4 LT |
2180 | .name = IPT_ERROR_TARGET, |
2181 | .target = ipt_error, | |
1d5cd909 | 2182 | .targetsize = IPT_FUNCTION_MAXNAMELEN, |
a45049c5 | 2183 | .family = AF_INET, |
1da177e4 LT |
2184 | }; |
2185 | ||
2186 | static struct nf_sockopt_ops ipt_sockopts = { | |
2187 | .pf = PF_INET, | |
2188 | .set_optmin = IPT_BASE_CTL, | |
2189 | .set_optmax = IPT_SO_SET_MAX+1, | |
2190 | .set = do_ipt_set_ctl, | |
2722971c DM |
2191 | #ifdef CONFIG_COMPAT |
2192 | .compat_set = compat_do_ipt_set_ctl, | |
2193 | #endif | |
1da177e4 LT |
2194 | .get_optmin = IPT_BASE_CTL, |
2195 | .get_optmax = IPT_SO_GET_MAX+1, | |
2196 | .get = do_ipt_get_ctl, | |
2722971c DM |
2197 | #ifdef CONFIG_COMPAT |
2198 | .compat_get = compat_do_ipt_get_ctl, | |
2199 | #endif | |
16fcec35 | 2200 | .owner = THIS_MODULE, |
1da177e4 LT |
2201 | }; |
2202 | ||
9f15c530 | 2203 | static struct xt_match icmp_matchstruct __read_mostly = { |
1da177e4 | 2204 | .name = "icmp", |
1d5cd909 PM |
2205 | .match = icmp_match, |
2206 | .matchsize = sizeof(struct ipt_icmp), | |
9c547959 | 2207 | .checkentry = icmp_checkentry, |
1d5cd909 | 2208 | .proto = IPPROTO_ICMP, |
a45049c5 | 2209 | .family = AF_INET, |
1da177e4 LT |
2210 | }; |
2211 | ||
3cb609d5 AD |
2212 | static int __net_init ip_tables_net_init(struct net *net) |
2213 | { | |
2214 | return xt_proto_init(net, AF_INET); | |
2215 | } | |
2216 | ||
2217 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2218 | { | |
2219 | xt_proto_fini(net, AF_INET); | |
2220 | } | |
2221 | ||
2222 | static struct pernet_operations ip_tables_net_ops = { | |
2223 | .init = ip_tables_net_init, | |
2224 | .exit = ip_tables_net_exit, | |
2225 | }; | |
2226 | ||
65b4b4e8 | 2227 | static int __init ip_tables_init(void) |
1da177e4 LT |
2228 | { |
2229 | int ret; | |
2230 | ||
3cb609d5 | 2231 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2232 | if (ret < 0) |
2233 | goto err1; | |
2e4e6a17 | 2234 | |
1da177e4 | 2235 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2236 | ret = xt_register_target(&ipt_standard_target); |
2237 | if (ret < 0) | |
2238 | goto err2; | |
2239 | ret = xt_register_target(&ipt_error_target); | |
2240 | if (ret < 0) | |
2241 | goto err3; | |
2242 | ret = xt_register_match(&icmp_matchstruct); | |
2243 | if (ret < 0) | |
2244 | goto err4; | |
1da177e4 LT |
2245 | |
2246 | /* Register setsockopt */ | |
2247 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2248 | if (ret < 0) |
2249 | goto err5; | |
1da177e4 | 2250 | |
0236e667 | 2251 | printk(KERN_INFO "ip_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2252 | return 0; |
0eff66e6 PM |
2253 | |
2254 | err5: | |
2255 | xt_unregister_match(&icmp_matchstruct); | |
2256 | err4: | |
2257 | xt_unregister_target(&ipt_error_target); | |
2258 | err3: | |
2259 | xt_unregister_target(&ipt_standard_target); | |
2260 | err2: | |
3cb609d5 | 2261 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2262 | err1: |
2263 | return ret; | |
1da177e4 LT |
2264 | } |
2265 | ||
65b4b4e8 | 2266 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2267 | { |
2268 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2269 | |
a45049c5 PNA |
2270 | xt_unregister_match(&icmp_matchstruct); |
2271 | xt_unregister_target(&ipt_error_target); | |
2272 | xt_unregister_target(&ipt_standard_target); | |
2e4e6a17 | 2273 | |
3cb609d5 | 2274 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2275 | } |
2276 | ||
2277 | EXPORT_SYMBOL(ipt_register_table); | |
2278 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2279 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2280 | module_init(ip_tables_init); |
2281 | module_exit(ip_tables_fini); |