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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 | */ |
90e7d4ab | 11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
1da177e4 | 12 | #include <linux/cache.h> |
4fc268d2 | 13 | #include <linux/capability.h> |
1da177e4 LT |
14 | #include <linux/skbuff.h> |
15 | #include <linux/kmod.h> | |
16 | #include <linux/vmalloc.h> | |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/module.h> | |
1da177e4 LT |
19 | #include <linux/icmp.h> |
20 | #include <net/ip.h> | |
2722971c | 21 | #include <net/compat.h> |
1da177e4 | 22 | #include <asm/uaccess.h> |
57b47a53 | 23 | #include <linux/mutex.h> |
1da177e4 LT |
24 | #include <linux/proc_fs.h> |
25 | #include <linux/err.h> | |
c8923c6b | 26 | #include <linux/cpumask.h> |
1da177e4 | 27 | |
2e4e6a17 | 28 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 29 | #include <linux/netfilter_ipv4/ip_tables.h> |
f01ffbd6 | 30 | #include <net/netfilter/nf_log.h> |
e3eaa991 | 31 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
32 | |
33 | MODULE_LICENSE("GPL"); | |
34 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
35 | MODULE_DESCRIPTION("IPv4 packet filter"); | |
36 | ||
37 | /*#define DEBUG_IP_FIREWALL*/ | |
38 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
39 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
40 | ||
41 | #ifdef DEBUG_IP_FIREWALL | |
ff67e4e4 | 42 | #define dprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
43 | #else |
44 | #define dprintf(format, args...) | |
45 | #endif | |
46 | ||
47 | #ifdef DEBUG_IP_FIREWALL_USER | |
ff67e4e4 | 48 | #define duprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
49 | #else |
50 | #define duprintf(format, args...) | |
51 | #endif | |
52 | ||
53 | #ifdef CONFIG_NETFILTER_DEBUG | |
af567603 | 54 | #define IP_NF_ASSERT(x) WARN_ON(!(x)) |
1da177e4 LT |
55 | #else |
56 | #define IP_NF_ASSERT(x) | |
57 | #endif | |
1da177e4 LT |
58 | |
59 | #if 0 | |
60 | /* All the better to debug you with... */ | |
61 | #define static | |
62 | #define inline | |
63 | #endif | |
64 | ||
e3eaa991 JE |
65 | void *ipt_alloc_initial_table(const struct xt_table *info) |
66 | { | |
67 | return xt_alloc_initial_table(ipt, IPT); | |
68 | } | |
69 | EXPORT_SYMBOL_GPL(ipt_alloc_initial_table); | |
70 | ||
1da177e4 | 71 | /* Returns whether matches rule or not. */ |
022748a9 | 72 | /* Performance critical - called for every packet */ |
9c547959 | 73 | static inline bool |
1da177e4 LT |
74 | ip_packet_match(const struct iphdr *ip, |
75 | const char *indev, | |
76 | const char *outdev, | |
77 | const struct ipt_ip *ipinfo, | |
78 | int isfrag) | |
79 | { | |
1da177e4 LT |
80 | unsigned long ret; |
81 | ||
e79ec50b | 82 | #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) |
1da177e4 LT |
83 | |
84 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, | |
3666ed1c JP |
85 | IPT_INV_SRCIP) || |
86 | FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, | |
87 | IPT_INV_DSTIP)) { | |
1da177e4 LT |
88 | dprintf("Source or dest mismatch.\n"); |
89 | ||
cffee385 HH |
90 | dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n", |
91 | &ip->saddr, &ipinfo->smsk.s_addr, &ipinfo->src.s_addr, | |
1da177e4 | 92 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); |
cffee385 HH |
93 | dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n", |
94 | &ip->daddr, &ipinfo->dmsk.s_addr, &ipinfo->dst.s_addr, | |
1da177e4 | 95 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); |
9c547959 | 96 | return false; |
1da177e4 LT |
97 | } |
98 | ||
b8dfe498 | 99 | ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask); |
1da177e4 LT |
100 | |
101 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { | |
102 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
103 | indev, ipinfo->iniface, | |
104 | ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":""); | |
9c547959 | 105 | return false; |
1da177e4 LT |
106 | } |
107 | ||
b8dfe498 | 108 | ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
1da177e4 LT |
109 | |
110 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { | |
111 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
112 | outdev, ipinfo->outiface, | |
113 | ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":""); | |
9c547959 | 114 | return false; |
1da177e4 LT |
115 | } |
116 | ||
117 | /* Check specific protocol */ | |
3666ed1c JP |
118 | if (ipinfo->proto && |
119 | FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { | |
1da177e4 LT |
120 | dprintf("Packet protocol %hi does not match %hi.%s\n", |
121 | ip->protocol, ipinfo->proto, | |
122 | ipinfo->invflags&IPT_INV_PROTO ? " (INV)":""); | |
9c547959 | 123 | return false; |
1da177e4 LT |
124 | } |
125 | ||
126 | /* If we have a fragment rule but the packet is not a fragment | |
127 | * then we return zero */ | |
128 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { | |
129 | dprintf("Fragment rule but not fragment.%s\n", | |
130 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); | |
9c547959 | 131 | return false; |
1da177e4 LT |
132 | } |
133 | ||
9c547959 | 134 | return true; |
1da177e4 LT |
135 | } |
136 | ||
022748a9 | 137 | static bool |
1da177e4 LT |
138 | ip_checkentry(const struct ipt_ip *ip) |
139 | { | |
140 | if (ip->flags & ~IPT_F_MASK) { | |
141 | duprintf("Unknown flag bits set: %08X\n", | |
142 | ip->flags & ~IPT_F_MASK); | |
ccb79bdc | 143 | return false; |
1da177e4 LT |
144 | } |
145 | if (ip->invflags & ~IPT_INV_MASK) { | |
146 | duprintf("Unknown invflag bits set: %08X\n", | |
147 | ip->invflags & ~IPT_INV_MASK); | |
ccb79bdc | 148 | return false; |
1da177e4 | 149 | } |
ccb79bdc | 150 | return true; |
1da177e4 LT |
151 | } |
152 | ||
153 | static unsigned int | |
4b560b44 | 154 | ipt_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 155 | { |
e87cc472 | 156 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
157 | |
158 | return NF_DROP; | |
159 | } | |
160 | ||
022748a9 | 161 | /* Performance critical */ |
1da177e4 | 162 | static inline struct ipt_entry * |
d5d1baa1 | 163 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
164 | { |
165 | return (struct ipt_entry *)(base + offset); | |
166 | } | |
167 | ||
ba9dda3a | 168 | /* All zeroes == unconditional rule. */ |
022748a9 | 169 | /* Mildly perf critical (only if packet tracing is on) */ |
47901dc2 | 170 | static inline bool unconditional(const struct ipt_ip *ip) |
ba9dda3a | 171 | { |
47901dc2 | 172 | static const struct ipt_ip uncond; |
ba9dda3a | 173 | |
47901dc2 | 174 | return memcmp(ip, &uncond, sizeof(uncond)) == 0; |
e79ec50b | 175 | #undef FWINV |
ba9dda3a JK |
176 | } |
177 | ||
d5d1baa1 | 178 | /* for const-correctness */ |
87a2e70d | 179 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
180 | ipt_get_target_c(const struct ipt_entry *e) |
181 | { | |
182 | return ipt_get_target((struct ipt_entry *)e); | |
183 | } | |
184 | ||
ba9dda3a JK |
185 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
186 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
022748a9 | 187 | static const char *const hooknames[] = { |
6e23ae2a PM |
188 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
189 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 190 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
191 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
192 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
193 | }; |
194 | ||
195 | enum nf_ip_trace_comments { | |
196 | NF_IP_TRACE_COMMENT_RULE, | |
197 | NF_IP_TRACE_COMMENT_RETURN, | |
198 | NF_IP_TRACE_COMMENT_POLICY, | |
199 | }; | |
200 | ||
022748a9 | 201 | static const char *const comments[] = { |
ba9dda3a JK |
202 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
203 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
204 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
205 | }; | |
206 | ||
207 | static struct nf_loginfo trace_loginfo = { | |
208 | .type = NF_LOG_TYPE_LOG, | |
209 | .u = { | |
210 | .log = { | |
211 | .level = 4, | |
212 | .logflags = NF_LOG_MASK, | |
213 | }, | |
214 | }, | |
215 | }; | |
216 | ||
022748a9 | 217 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 218 | static inline int |
d5d1baa1 | 219 | get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e, |
4f2f6f23 JE |
220 | const char *hookname, const char **chainname, |
221 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 222 | { |
87a2e70d | 223 | const struct xt_standard_target *t = (void *)ipt_get_target_c(s); |
ba9dda3a | 224 | |
243bf6e2 | 225 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
226 | /* Head of user chain: ERROR target with chainname */ |
227 | *chainname = t->target.data; | |
228 | (*rulenum) = 0; | |
229 | } else if (s == e) { | |
230 | (*rulenum)++; | |
231 | ||
3666ed1c JP |
232 | if (s->target_offset == sizeof(struct ipt_entry) && |
233 | strcmp(t->target.u.kernel.target->name, | |
243bf6e2 | 234 | XT_STANDARD_TARGET) == 0 && |
3666ed1c JP |
235 | t->verdict < 0 && |
236 | unconditional(&s->ip)) { | |
ba9dda3a JK |
237 | /* Tail of chains: STANDARD target (return/policy) */ |
238 | *comment = *chainname == hookname | |
4f2f6f23 JE |
239 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
240 | : comments[NF_IP_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
241 | } |
242 | return 1; | |
243 | } else | |
244 | (*rulenum)++; | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
d5d1baa1 | 249 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
250 | unsigned int hook, |
251 | const struct net_device *in, | |
252 | const struct net_device *out, | |
ecb6f85e | 253 | const char *tablename, |
d5d1baa1 JE |
254 | const struct xt_table_info *private, |
255 | const struct ipt_entry *e) | |
ba9dda3a | 256 | { |
d5d1baa1 | 257 | const void *table_base; |
5452e425 | 258 | const struct ipt_entry *root; |
4f2f6f23 | 259 | const char *hookname, *chainname, *comment; |
72b2b1dd | 260 | const struct ipt_entry *iter; |
ba9dda3a JK |
261 | unsigned int rulenum = 0; |
262 | ||
ccf5bd8c | 263 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
264 | root = get_entry(table_base, private->hook_entry[hook]); |
265 | ||
4f2f6f23 JE |
266 | hookname = chainname = hooknames[hook]; |
267 | comment = comments[NF_IP_TRACE_COMMENT_RULE]; | |
ba9dda3a | 268 | |
72b2b1dd JE |
269 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
270 | if (get_chainname_rulenum(iter, e, hookname, | |
271 | &chainname, &comment, &rulenum) != 0) | |
272 | break; | |
ba9dda3a JK |
273 | |
274 | nf_log_packet(AF_INET, hook, skb, in, out, &trace_loginfo, | |
275 | "TRACE: %s:%s:%s:%u ", | |
276 | tablename, chainname, comment, rulenum); | |
277 | } | |
278 | #endif | |
279 | ||
98e86403 JE |
280 | static inline __pure |
281 | struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry) | |
282 | { | |
283 | return (void *)entry + entry->next_offset; | |
284 | } | |
285 | ||
1da177e4 LT |
286 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
287 | unsigned int | |
3db05fea | 288 | ipt_do_table(struct sk_buff *skb, |
1da177e4 LT |
289 | unsigned int hook, |
290 | const struct net_device *in, | |
291 | const struct net_device *out, | |
e60a13e0 | 292 | struct xt_table *table) |
1da177e4 LT |
293 | { |
294 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); | |
5452e425 | 295 | const struct iphdr *ip; |
1da177e4 LT |
296 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
297 | unsigned int verdict = NF_DROP; | |
298 | const char *indev, *outdev; | |
d5d1baa1 | 299 | const void *table_base; |
f3c5c1bf JE |
300 | struct ipt_entry *e, **jumpstack; |
301 | unsigned int *stackptr, origptr, cpu; | |
d5d1baa1 | 302 | const struct xt_table_info *private; |
de74c169 | 303 | struct xt_action_param acpar; |
7f5c6d4f | 304 | unsigned int addend; |
1da177e4 LT |
305 | |
306 | /* Initialization */ | |
3db05fea | 307 | ip = ip_hdr(skb); |
1da177e4 LT |
308 | indev = in ? in->name : nulldevname; |
309 | outdev = out ? out->name : nulldevname; | |
310 | /* We handle fragments by dealing with the first fragment as | |
311 | * if it was a normal packet. All other fragments are treated | |
312 | * normally, except that they will NEVER match rules that ask | |
313 | * things we don't know, ie. tcp syn flag or ports). If the | |
314 | * rule is also a fragment-specific rule, non-fragments won't | |
315 | * match it. */ | |
de74c169 JE |
316 | acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
317 | acpar.thoff = ip_hdrlen(skb); | |
b4ba2611 | 318 | acpar.hotdrop = false; |
de74c169 JE |
319 | acpar.in = in; |
320 | acpar.out = out; | |
321 | acpar.family = NFPROTO_IPV4; | |
322 | acpar.hooknum = hook; | |
1da177e4 | 323 | |
1da177e4 | 324 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
7f5c6d4f ED |
325 | local_bh_disable(); |
326 | addend = xt_write_recseq_begin(); | |
942e4a2b | 327 | private = table->private; |
f3c5c1bf JE |
328 | cpu = smp_processor_id(); |
329 | table_base = private->entries[cpu]; | |
330 | jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; | |
7489aec8 | 331 | stackptr = per_cpu_ptr(private->stackptr, cpu); |
f3c5c1bf | 332 | origptr = *stackptr; |
78454473 | 333 | |
2e4e6a17 | 334 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 335 | |
cecc74de | 336 | pr_debug("Entering %s(hook %u); sp at %u (UF %p)\n", |
f3c5c1bf JE |
337 | table->name, hook, origptr, |
338 | get_entry(table_base, private->underflow[hook])); | |
1da177e4 LT |
339 | |
340 | do { | |
87a2e70d | 341 | const struct xt_entry_target *t; |
dcea992a | 342 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 343 | |
1da177e4 | 344 | IP_NF_ASSERT(e); |
a1ff4ac8 | 345 | if (!ip_packet_match(ip, indev, outdev, |
de74c169 | 346 | &e->ip, acpar.fragoff)) { |
dcea992a | 347 | no_match: |
a1ff4ac8 JE |
348 | e = ipt_next_entry(e); |
349 | continue; | |
350 | } | |
1da177e4 | 351 | |
ef53d702 | 352 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
353 | acpar.match = ematch->u.kernel.match; |
354 | acpar.matchinfo = ematch->data; | |
355 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 356 | goto no_match; |
ef53d702 | 357 | } |
dcea992a | 358 | |
7df0884c | 359 | ADD_COUNTER(e->counters, skb->len, 1); |
1da177e4 | 360 | |
a1ff4ac8 JE |
361 | t = ipt_get_target(e); |
362 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
363 | |
364 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
365 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
a1ff4ac8 JE |
366 | /* The packet is traced: log it */ |
367 | if (unlikely(skb->nf_trace)) | |
368 | trace_packet(skb, hook, in, out, | |
369 | table->name, private, e); | |
ba9dda3a | 370 | #endif |
a1ff4ac8 JE |
371 | /* Standard target? */ |
372 | if (!t->u.kernel.target->target) { | |
373 | int v; | |
374 | ||
87a2e70d | 375 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
376 | if (v < 0) { |
377 | /* Pop from stack? */ | |
243bf6e2 | 378 | if (v != XT_RETURN) { |
95c96174 | 379 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 380 | break; |
1da177e4 | 381 | } |
db856674 | 382 | if (*stackptr <= origptr) { |
f3c5c1bf JE |
383 | e = get_entry(table_base, |
384 | private->underflow[hook]); | |
cecc74de | 385 | pr_debug("Underflow (this is normal) " |
f3c5c1bf JE |
386 | "to %p\n", e); |
387 | } else { | |
388 | e = jumpstack[--*stackptr]; | |
cecc74de | 389 | pr_debug("Pulled %p out from pos %u\n", |
f3c5c1bf JE |
390 | e, *stackptr); |
391 | e = ipt_next_entry(e); | |
392 | } | |
a1ff4ac8 JE |
393 | continue; |
394 | } | |
3666ed1c JP |
395 | if (table_base + v != ipt_next_entry(e) && |
396 | !(e->ip.flags & IPT_F_GOTO)) { | |
f3c5c1bf JE |
397 | if (*stackptr >= private->stacksize) { |
398 | verdict = NF_DROP; | |
399 | break; | |
400 | } | |
401 | jumpstack[(*stackptr)++] = e; | |
cecc74de | 402 | pr_debug("Pushed %p into pos %u\n", |
f3c5c1bf | 403 | e, *stackptr - 1); |
a1ff4ac8 | 404 | } |
1da177e4 | 405 | |
a1ff4ac8 | 406 | e = get_entry(table_base, v); |
7a6b1c46 JE |
407 | continue; |
408 | } | |
409 | ||
de74c169 JE |
410 | acpar.target = t->u.kernel.target; |
411 | acpar.targinfo = t->data; | |
bb70dfa5 | 412 | |
de74c169 | 413 | verdict = t->u.kernel.target->target(skb, &acpar); |
7a6b1c46 JE |
414 | /* Target might have changed stuff. */ |
415 | ip = ip_hdr(skb); | |
243bf6e2 | 416 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
417 | e = ipt_next_entry(e); |
418 | else | |
419 | /* Verdict */ | |
420 | break; | |
b4ba2611 | 421 | } while (!acpar.hotdrop); |
cecc74de | 422 | pr_debug("Exiting %s; resetting sp from %u to %u\n", |
f3c5c1bf JE |
423 | __func__, *stackptr, origptr); |
424 | *stackptr = origptr; | |
7f5c6d4f ED |
425 | xt_write_recseq_end(addend); |
426 | local_bh_enable(); | |
427 | ||
1da177e4 LT |
428 | #ifdef DEBUG_ALLOW_ALL |
429 | return NF_ACCEPT; | |
430 | #else | |
b4ba2611 | 431 | if (acpar.hotdrop) |
1da177e4 LT |
432 | return NF_DROP; |
433 | else return verdict; | |
434 | #endif | |
435 | } | |
436 | ||
1da177e4 LT |
437 | /* Figures out from what hook each rule can be called: returns 0 if |
438 | there are loops. Puts hook bitmask in comefrom. */ | |
439 | static int | |
d5d1baa1 | 440 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 441 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
442 | { |
443 | unsigned int hook; | |
444 | ||
445 | /* No recursion; use packet counter to save back ptrs (reset | |
446 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 447 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 448 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 449 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
450 | |
451 | if (!(valid_hooks & (1 << hook))) | |
452 | continue; | |
453 | ||
454 | /* Set initial back pointer. */ | |
455 | e->counters.pcnt = pos; | |
456 | ||
457 | for (;;) { | |
87a2e70d | 458 | const struct xt_standard_target *t |
d5d1baa1 | 459 | = (void *)ipt_get_target_c(e); |
e1b4b9f3 | 460 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 461 | |
6e23ae2a | 462 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
654d0fbd | 463 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
464 | hook, pos, e->comefrom); |
465 | return 0; | |
466 | } | |
9c547959 | 467 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
468 | |
469 | /* Unconditional return/END. */ | |
3666ed1c JP |
470 | if ((e->target_offset == sizeof(struct ipt_entry) && |
471 | (strcmp(t->target.u.user.name, | |
243bf6e2 | 472 | XT_STANDARD_TARGET) == 0) && |
3666ed1c JP |
473 | t->verdict < 0 && unconditional(&e->ip)) || |
474 | visited) { | |
1da177e4 LT |
475 | unsigned int oldpos, size; |
476 | ||
1f9352ae | 477 | if ((strcmp(t->target.u.user.name, |
243bf6e2 | 478 | XT_STANDARD_TARGET) == 0) && |
1f9352ae | 479 | t->verdict < -NF_MAX_VERDICT - 1) { |
74c9c0c1 DM |
480 | duprintf("mark_source_chains: bad " |
481 | "negative verdict (%i)\n", | |
482 | t->verdict); | |
483 | return 0; | |
484 | } | |
485 | ||
1da177e4 LT |
486 | /* Return: backtrack through the last |
487 | big jump. */ | |
488 | do { | |
6e23ae2a | 489 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
490 | #ifdef DEBUG_IP_FIREWALL_USER |
491 | if (e->comefrom | |
6e23ae2a | 492 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
493 | duprintf("Back unset " |
494 | "on hook %u " | |
495 | "rule %u\n", | |
496 | hook, pos); | |
497 | } | |
498 | #endif | |
499 | oldpos = pos; | |
500 | pos = e->counters.pcnt; | |
501 | e->counters.pcnt = 0; | |
502 | ||
503 | /* We're at the start. */ | |
504 | if (pos == oldpos) | |
505 | goto next; | |
506 | ||
507 | e = (struct ipt_entry *) | |
31836064 | 508 | (entry0 + pos); |
1da177e4 LT |
509 | } while (oldpos == pos + e->next_offset); |
510 | ||
511 | /* Move along one */ | |
512 | size = e->next_offset; | |
513 | e = (struct ipt_entry *) | |
31836064 | 514 | (entry0 + pos + size); |
1da177e4 LT |
515 | e->counters.pcnt = pos; |
516 | pos += size; | |
517 | } else { | |
518 | int newpos = t->verdict; | |
519 | ||
520 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 521 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 522 | newpos >= 0) { |
74c9c0c1 DM |
523 | if (newpos > newinfo->size - |
524 | sizeof(struct ipt_entry)) { | |
525 | duprintf("mark_source_chains: " | |
526 | "bad verdict (%i)\n", | |
527 | newpos); | |
528 | return 0; | |
529 | } | |
1da177e4 LT |
530 | /* This a jump; chase it. */ |
531 | duprintf("Jump rule %u -> %u\n", | |
532 | pos, newpos); | |
533 | } else { | |
534 | /* ... this is a fallthru */ | |
535 | newpos = pos + e->next_offset; | |
536 | } | |
537 | e = (struct ipt_entry *) | |
31836064 | 538 | (entry0 + newpos); |
1da177e4 LT |
539 | e->counters.pcnt = pos; |
540 | pos = newpos; | |
541 | } | |
542 | } | |
543 | next: | |
544 | duprintf("Finished chain %u\n", hook); | |
545 | } | |
546 | return 1; | |
547 | } | |
548 | ||
87a2e70d | 549 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 550 | { |
6be3d859 JE |
551 | struct xt_mtdtor_param par; |
552 | ||
f54e9367 | 553 | par.net = net; |
6be3d859 JE |
554 | par.match = m->u.kernel.match; |
555 | par.matchinfo = m->data; | |
916a917d | 556 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
557 | if (par.match->destroy != NULL) |
558 | par.match->destroy(&par); | |
559 | module_put(par.match->me); | |
1da177e4 LT |
560 | } |
561 | ||
022748a9 | 562 | static int |
d5d1baa1 | 563 | check_entry(const struct ipt_entry *e, const char *name) |
a96be246 | 564 | { |
87a2e70d | 565 | const struct xt_entry_target *t; |
a96be246 DM |
566 | |
567 | if (!ip_checkentry(&e->ip)) { | |
63f6fe92 | 568 | duprintf("ip check failed %p %s.\n", e, name); |
a96be246 DM |
569 | return -EINVAL; |
570 | } | |
571 | ||
87a2e70d | 572 | if (e->target_offset + sizeof(struct xt_entry_target) > |
9c547959 | 573 | e->next_offset) |
a96be246 DM |
574 | return -EINVAL; |
575 | ||
d5d1baa1 | 576 | t = ipt_get_target_c(e); |
a96be246 DM |
577 | if (e->target_offset + t->u.target_size > e->next_offset) |
578 | return -EINVAL; | |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
022748a9 | 583 | static int |
87a2e70d | 584 | check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
a96be246 | 585 | { |
9b4fce7a | 586 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 DM |
587 | int ret; |
588 | ||
9b4fce7a JE |
589 | par->match = m->u.kernel.match; |
590 | par->matchinfo = m->data; | |
591 | ||
916a917d | 592 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 593 | ip->proto, ip->invflags & IPT_INV_PROTO); |
367c6790 | 594 | if (ret < 0) { |
b5cad0df | 595 | duprintf("check failed for `%s'.\n", par->match->name); |
367c6790 | 596 | return ret; |
a96be246 | 597 | } |
367c6790 | 598 | return 0; |
a96be246 DM |
599 | } |
600 | ||
022748a9 | 601 | static int |
87a2e70d | 602 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 603 | { |
6709dbbb | 604 | struct xt_match *match; |
3cdc7c95 | 605 | int ret; |
1da177e4 | 606 | |
fd0ec0e6 JE |
607 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
608 | m->u.user.revision); | |
609 | if (IS_ERR(match)) { | |
a96be246 | 610 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 611 | return PTR_ERR(match); |
1da177e4 LT |
612 | } |
613 | m->u.kernel.match = match; | |
614 | ||
6bdb331b | 615 | ret = check_match(m, par); |
3cdc7c95 PM |
616 | if (ret) |
617 | goto err; | |
618 | ||
1da177e4 | 619 | return 0; |
3cdc7c95 PM |
620 | err: |
621 | module_put(m->u.kernel.match->me); | |
622 | return ret; | |
1da177e4 LT |
623 | } |
624 | ||
add67461 | 625 | static int check_target(struct ipt_entry *e, struct net *net, const char *name) |
a96be246 | 626 | { |
87a2e70d | 627 | struct xt_entry_target *t = ipt_get_target(e); |
af5d6dc2 | 628 | struct xt_tgchk_param par = { |
add67461 | 629 | .net = net, |
af5d6dc2 JE |
630 | .table = name, |
631 | .entryinfo = e, | |
632 | .target = t->u.kernel.target, | |
633 | .targinfo = t->data, | |
634 | .hook_mask = e->comefrom, | |
916a917d | 635 | .family = NFPROTO_IPV4, |
af5d6dc2 | 636 | }; |
e905a9ed | 637 | int ret; |
a96be246 | 638 | |
916a917d | 639 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 640 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
367c6790 | 641 | if (ret < 0) { |
ff67e4e4 | 642 | duprintf("check failed for `%s'.\n", |
a96be246 | 643 | t->u.kernel.target->name); |
367c6790 | 644 | return ret; |
a96be246 | 645 | } |
367c6790 | 646 | return 0; |
a96be246 | 647 | } |
1da177e4 | 648 | |
022748a9 | 649 | static int |
a83d8e8d | 650 | find_check_entry(struct ipt_entry *e, struct net *net, const char *name, |
0559518b | 651 | unsigned int size) |
1da177e4 | 652 | { |
87a2e70d | 653 | struct xt_entry_target *t; |
6709dbbb | 654 | struct xt_target *target; |
1da177e4 LT |
655 | int ret; |
656 | unsigned int j; | |
9b4fce7a | 657 | struct xt_mtchk_param mtpar; |
dcea992a | 658 | struct xt_entry_match *ematch; |
1da177e4 | 659 | |
a96be246 DM |
660 | ret = check_entry(e, name); |
661 | if (ret) | |
662 | return ret; | |
590bdf7f | 663 | |
1da177e4 | 664 | j = 0; |
a83d8e8d | 665 | mtpar.net = net; |
9b4fce7a JE |
666 | mtpar.table = name; |
667 | mtpar.entryinfo = &e->ip; | |
668 | mtpar.hook_mask = e->comefrom; | |
916a917d | 669 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 670 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 671 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 672 | if (ret != 0) |
6bdb331b JE |
673 | goto cleanup_matches; |
674 | ++j; | |
dcea992a | 675 | } |
1da177e4 LT |
676 | |
677 | t = ipt_get_target(e); | |
d2a7b6ba JE |
678 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
679 | t->u.user.revision); | |
680 | if (IS_ERR(target)) { | |
a96be246 | 681 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 682 | ret = PTR_ERR(target); |
1da177e4 LT |
683 | goto cleanup_matches; |
684 | } | |
685 | t->u.kernel.target = target; | |
686 | ||
add67461 | 687 | ret = check_target(e, net, name); |
3cdc7c95 PM |
688 | if (ret) |
689 | goto err; | |
1da177e4 | 690 | return 0; |
3cdc7c95 PM |
691 | err: |
692 | module_put(t->u.kernel.target->me); | |
1da177e4 | 693 | cleanup_matches: |
6bdb331b JE |
694 | xt_ematch_foreach(ematch, e) { |
695 | if (j-- == 0) | |
dcea992a | 696 | break; |
6bdb331b JE |
697 | cleanup_match(ematch, net); |
698 | } | |
1da177e4 LT |
699 | return ret; |
700 | } | |
701 | ||
d5d1baa1 | 702 | static bool check_underflow(const struct ipt_entry *e) |
e2fe35c1 | 703 | { |
87a2e70d | 704 | const struct xt_entry_target *t; |
e2fe35c1 JE |
705 | unsigned int verdict; |
706 | ||
707 | if (!unconditional(&e->ip)) | |
708 | return false; | |
d5d1baa1 | 709 | t = ipt_get_target_c(e); |
e2fe35c1 JE |
710 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
711 | return false; | |
87a2e70d | 712 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
713 | verdict = -verdict - 1; |
714 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
715 | } | |
716 | ||
022748a9 | 717 | static int |
1da177e4 | 718 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 719 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
720 | const unsigned char *base, |
721 | const unsigned char *limit, | |
1da177e4 LT |
722 | const unsigned int *hook_entries, |
723 | const unsigned int *underflows, | |
0559518b | 724 | unsigned int valid_hooks) |
1da177e4 LT |
725 | { |
726 | unsigned int h; | |
727 | ||
3666ed1c JP |
728 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 || |
729 | (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { | |
1da177e4 LT |
730 | duprintf("Bad offset %p\n", e); |
731 | return -EINVAL; | |
732 | } | |
733 | ||
734 | if (e->next_offset | |
87a2e70d | 735 | < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target)) { |
1da177e4 LT |
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++) { |
a7d51738 JE |
743 | if (!(valid_hooks & (1 << h))) |
744 | continue; | |
1da177e4 LT |
745 | if ((unsigned char *)e - base == hook_entries[h]) |
746 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 747 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
748 | if (!check_underflow(e)) { |
749 | pr_err("Underflows must be unconditional and " | |
750 | "use the STANDARD target with " | |
751 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
752 | return -EINVAL; |
753 | } | |
1da177e4 | 754 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 755 | } |
1da177e4 LT |
756 | } |
757 | ||
1da177e4 | 758 | /* Clear counters and comefrom */ |
2e4e6a17 | 759 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 760 | e->comefrom = 0; |
1da177e4 LT |
761 | return 0; |
762 | } | |
763 | ||
0559518b JE |
764 | static void |
765 | cleanup_entry(struct ipt_entry *e, struct net *net) | |
1da177e4 | 766 | { |
a2df1648 | 767 | struct xt_tgdtor_param par; |
87a2e70d | 768 | struct xt_entry_target *t; |
dcea992a | 769 | struct xt_entry_match *ematch; |
1da177e4 | 770 | |
1da177e4 | 771 | /* Cleanup all matches */ |
dcea992a | 772 | xt_ematch_foreach(ematch, e) |
6bdb331b | 773 | cleanup_match(ematch, net); |
1da177e4 | 774 | t = ipt_get_target(e); |
a2df1648 | 775 | |
add67461 | 776 | par.net = net; |
a2df1648 JE |
777 | par.target = t->u.kernel.target; |
778 | par.targinfo = t->data; | |
916a917d | 779 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
780 | if (par.target->destroy != NULL) |
781 | par.target->destroy(&par); | |
782 | module_put(par.target->me); | |
1da177e4 LT |
783 | } |
784 | ||
785 | /* Checks and translates the user-supplied table segment (held in | |
786 | newinfo) */ | |
787 | static int | |
0f234214 JE |
788 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
789 | const struct ipt_replace *repl) | |
1da177e4 | 790 | { |
72b2b1dd | 791 | struct ipt_entry *iter; |
1da177e4 | 792 | unsigned int i; |
72b2b1dd | 793 | int ret = 0; |
1da177e4 | 794 | |
0f234214 JE |
795 | newinfo->size = repl->size; |
796 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
797 | |
798 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 799 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
800 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
801 | newinfo->underflow[i] = 0xFFFFFFFF; | |
802 | } | |
803 | ||
804 | duprintf("translate_table: size %u\n", newinfo->size); | |
805 | i = 0; | |
806 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
807 | xt_entry_foreach(iter, entry0, newinfo->size) { |
808 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
809 | entry0 + repl->size, |
810 | repl->hook_entry, | |
811 | repl->underflow, | |
812 | repl->valid_hooks); | |
72b2b1dd | 813 | if (ret != 0) |
0559518b JE |
814 | return ret; |
815 | ++i; | |
f3c5c1bf JE |
816 | if (strcmp(ipt_get_target(iter)->u.user.name, |
817 | XT_ERROR_TARGET) == 0) | |
818 | ++newinfo->stacksize; | |
72b2b1dd | 819 | } |
1da177e4 | 820 | |
0f234214 | 821 | if (i != repl->num_entries) { |
1da177e4 | 822 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 823 | i, repl->num_entries); |
1da177e4 LT |
824 | return -EINVAL; |
825 | } | |
826 | ||
827 | /* Check hooks all assigned */ | |
6e23ae2a | 828 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 829 | /* Only hooks which are valid */ |
0f234214 | 830 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
831 | continue; |
832 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
833 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 834 | i, repl->hook_entry[i]); |
1da177e4 LT |
835 | return -EINVAL; |
836 | } | |
837 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
838 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 839 | i, repl->underflow[i]); |
1da177e4 LT |
840 | return -EINVAL; |
841 | } | |
842 | } | |
843 | ||
0f234214 | 844 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
845 | return -ELOOP; |
846 | ||
1da177e4 LT |
847 | /* Finally, each sanity check must pass */ |
848 | i = 0; | |
72b2b1dd | 849 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 850 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
851 | if (ret != 0) |
852 | break; | |
0559518b | 853 | ++i; |
72b2b1dd | 854 | } |
1da177e4 | 855 | |
74c9c0c1 | 856 | if (ret != 0) { |
0559518b JE |
857 | xt_entry_foreach(iter, entry0, newinfo->size) { |
858 | if (i-- == 0) | |
72b2b1dd | 859 | break; |
0559518b JE |
860 | cleanup_entry(iter, net); |
861 | } | |
74c9c0c1 DM |
862 | return ret; |
863 | } | |
1da177e4 LT |
864 | |
865 | /* And one copy for every other CPU */ | |
6f912042 | 866 | for_each_possible_cpu(i) { |
31836064 ED |
867 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
868 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
869 | } |
870 | ||
871 | return ret; | |
872 | } | |
873 | ||
1da177e4 | 874 | static void |
2e4e6a17 HW |
875 | get_counters(const struct xt_table_info *t, |
876 | struct xt_counters counters[]) | |
1da177e4 | 877 | { |
72b2b1dd | 878 | struct ipt_entry *iter; |
1da177e4 LT |
879 | unsigned int cpu; |
880 | unsigned int i; | |
881 | ||
6f912042 | 882 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 883 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 884 | |
1da177e4 | 885 | i = 0; |
0559518b | 886 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
83723d60 ED |
887 | u64 bcnt, pcnt; |
888 | unsigned int start; | |
889 | ||
890 | do { | |
7f5c6d4f | 891 | start = read_seqcount_begin(s); |
83723d60 ED |
892 | bcnt = iter->counters.bcnt; |
893 | pcnt = iter->counters.pcnt; | |
7f5c6d4f | 894 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
895 | |
896 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
897 | ++i; /* macro does multi eval of i */ |
898 | } | |
1da177e4 | 899 | } |
78454473 SH |
900 | } |
901 | ||
d5d1baa1 | 902 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 903 | { |
2722971c | 904 | unsigned int countersize; |
2e4e6a17 | 905 | struct xt_counters *counters; |
d5d1baa1 | 906 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
907 | |
908 | /* We need atomic snapshot of counters: rest doesn't change | |
909 | (other than comefrom, which userspace doesn't care | |
910 | about). */ | |
2e4e6a17 | 911 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 912 | counters = vzalloc(countersize); |
1da177e4 LT |
913 | |
914 | if (counters == NULL) | |
942e4a2b | 915 | return ERR_PTR(-ENOMEM); |
78454473 | 916 | |
942e4a2b | 917 | get_counters(private, counters); |
1da177e4 | 918 | |
2722971c DM |
919 | return counters; |
920 | } | |
921 | ||
922 | static int | |
923 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 924 | const struct xt_table *table, |
2722971c DM |
925 | void __user *userptr) |
926 | { | |
927 | unsigned int off, num; | |
d5d1baa1 | 928 | const struct ipt_entry *e; |
2722971c | 929 | struct xt_counters *counters; |
5452e425 | 930 | const struct xt_table_info *private = table->private; |
2722971c | 931 | int ret = 0; |
5452e425 | 932 | const void *loc_cpu_entry; |
2722971c DM |
933 | |
934 | counters = alloc_counters(table); | |
935 | if (IS_ERR(counters)) | |
936 | return PTR_ERR(counters); | |
937 | ||
31836064 ED |
938 | /* choose the copy that is on our node/cpu, ... |
939 | * This choice is lazy (because current thread is | |
940 | * allowed to migrate to another cpu) | |
941 | */ | |
2e4e6a17 | 942 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 943 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
944 | ret = -EFAULT; |
945 | goto free_counters; | |
946 | } | |
947 | ||
948 | /* FIXME: use iterator macros --RR */ | |
949 | /* ... then go back and fix counters and names */ | |
950 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
951 | unsigned int i; | |
87a2e70d JE |
952 | const struct xt_entry_match *m; |
953 | const struct xt_entry_target *t; | |
1da177e4 | 954 | |
31836064 | 955 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
956 | if (copy_to_user(userptr + off |
957 | + offsetof(struct ipt_entry, counters), | |
958 | &counters[num], | |
959 | sizeof(counters[num])) != 0) { | |
960 | ret = -EFAULT; | |
961 | goto free_counters; | |
962 | } | |
963 | ||
964 | for (i = sizeof(struct ipt_entry); | |
965 | i < e->target_offset; | |
966 | i += m->u.match_size) { | |
967 | m = (void *)e + i; | |
968 | ||
969 | if (copy_to_user(userptr + off + i | |
87a2e70d | 970 | + offsetof(struct xt_entry_match, |
1da177e4 LT |
971 | u.user.name), |
972 | m->u.kernel.match->name, | |
973 | strlen(m->u.kernel.match->name)+1) | |
974 | != 0) { | |
975 | ret = -EFAULT; | |
976 | goto free_counters; | |
977 | } | |
978 | } | |
979 | ||
d5d1baa1 | 980 | t = ipt_get_target_c(e); |
1da177e4 | 981 | if (copy_to_user(userptr + off + e->target_offset |
87a2e70d | 982 | + offsetof(struct xt_entry_target, |
1da177e4 LT |
983 | u.user.name), |
984 | t->u.kernel.target->name, | |
985 | strlen(t->u.kernel.target->name)+1) != 0) { | |
986 | ret = -EFAULT; | |
987 | goto free_counters; | |
988 | } | |
989 | } | |
990 | ||
991 | free_counters: | |
992 | vfree(counters); | |
993 | return ret; | |
994 | } | |
995 | ||
2722971c | 996 | #ifdef CONFIG_COMPAT |
739674fb | 997 | static void compat_standard_from_user(void *dst, const void *src) |
2722971c | 998 | { |
9fa492cd | 999 | int v = *(compat_int_t *)src; |
2722971c | 1000 | |
9fa492cd | 1001 | if (v > 0) |
b386d9f5 | 1002 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1003 | memcpy(dst, &v, sizeof(v)); |
1004 | } | |
46c5ea3c | 1005 | |
739674fb | 1006 | static int compat_standard_to_user(void __user *dst, const void *src) |
2722971c | 1007 | { |
9fa492cd | 1008 | compat_int_t cv = *(int *)src; |
2722971c | 1009 | |
9fa492cd | 1010 | if (cv > 0) |
b386d9f5 | 1011 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1012 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1013 | } |
1014 | ||
d5d1baa1 | 1015 | static int compat_calc_entry(const struct ipt_entry *e, |
4b478248 | 1016 | const struct xt_table_info *info, |
d5d1baa1 | 1017 | const void *base, struct xt_table_info *newinfo) |
2722971c | 1018 | { |
dcea992a | 1019 | const struct xt_entry_match *ematch; |
87a2e70d | 1020 | const struct xt_entry_target *t; |
e5b5ef7d | 1021 | unsigned int entry_offset; |
2722971c DM |
1022 | int off, i, ret; |
1023 | ||
30c08c41 | 1024 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c | 1025 | entry_offset = (void *)e - base; |
dcea992a | 1026 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1027 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1028 | t = ipt_get_target_c(e); |
9fa492cd | 1029 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1030 | newinfo->size -= off; |
b386d9f5 | 1031 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1032 | if (ret) |
1033 | return ret; | |
1034 | ||
6e23ae2a | 1035 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1036 | if (info->hook_entry[i] && |
1037 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1038 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1039 | if (info->underflow[i] && |
1040 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1041 | newinfo->underflow[i] -= off; |
1042 | } | |
1043 | return 0; | |
1044 | } | |
1045 | ||
259d4e41 | 1046 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1047 | struct xt_table_info *newinfo) |
2722971c | 1048 | { |
72b2b1dd | 1049 | struct ipt_entry *iter; |
2722971c | 1050 | void *loc_cpu_entry; |
0559518b | 1051 | int ret; |
2722971c DM |
1052 | |
1053 | if (!newinfo || !info) | |
1054 | return -EINVAL; | |
1055 | ||
259d4e41 ED |
1056 | /* we dont care about newinfo->entries[] */ |
1057 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1058 | newinfo->initial_entries = 0; | |
2722971c | 1059 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
255d0dc3 | 1060 | xt_compat_init_offsets(AF_INET, info->number); |
72b2b1dd JE |
1061 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1062 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1063 | if (ret != 0) | |
0559518b | 1064 | return ret; |
72b2b1dd | 1065 | } |
0559518b | 1066 | return 0; |
2722971c DM |
1067 | } |
1068 | #endif | |
1069 | ||
d5d1baa1 JE |
1070 | static int get_info(struct net *net, void __user *user, |
1071 | const int *len, int compat) | |
2722971c | 1072 | { |
12b00c2c | 1073 | char name[XT_TABLE_MAXNAMELEN]; |
e60a13e0 | 1074 | struct xt_table *t; |
2722971c DM |
1075 | int ret; |
1076 | ||
1077 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1078 | duprintf("length %u != %zu\n", *len, |
1079 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1080 | return -EINVAL; |
1081 | } | |
1082 | ||
1083 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1084 | return -EFAULT; | |
1085 | ||
12b00c2c | 1086 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
2722971c DM |
1087 | #ifdef CONFIG_COMPAT |
1088 | if (compat) | |
1089 | xt_compat_lock(AF_INET); | |
1090 | #endif | |
34bd137b | 1091 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1092 | "iptable_%s", name); |
2722971c DM |
1093 | if (t && !IS_ERR(t)) { |
1094 | struct ipt_getinfo info; | |
5452e425 | 1095 | const struct xt_table_info *private = t->private; |
2722971c | 1096 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1097 | struct xt_table_info tmp; |
1098 | ||
2722971c | 1099 | if (compat) { |
2722971c | 1100 | ret = compat_table_info(private, &tmp); |
b386d9f5 | 1101 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1102 | private = &tmp; |
2722971c DM |
1103 | } |
1104 | #endif | |
b5f15ac4 | 1105 | memset(&info, 0, sizeof(info)); |
2722971c DM |
1106 | info.valid_hooks = t->valid_hooks; |
1107 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1108 | sizeof(info.hook_entry)); |
2722971c | 1109 | memcpy(info.underflow, private->underflow, |
4b478248 | 1110 | sizeof(info.underflow)); |
2722971c DM |
1111 | info.num_entries = private->number; |
1112 | info.size = private->size; | |
1113 | strcpy(info.name, name); | |
1114 | ||
1115 | if (copy_to_user(user, &info, *len) != 0) | |
1116 | ret = -EFAULT; | |
1117 | else | |
1118 | ret = 0; | |
1119 | ||
1120 | xt_table_unlock(t); | |
1121 | module_put(t->me); | |
1122 | } else | |
1123 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1124 | #ifdef CONFIG_COMPAT | |
1125 | if (compat) | |
1126 | xt_compat_unlock(AF_INET); | |
1127 | #endif | |
1128 | return ret; | |
1129 | } | |
1130 | ||
1131 | static int | |
d5d1baa1 JE |
1132 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
1133 | const int *len) | |
2722971c DM |
1134 | { |
1135 | int ret; | |
1136 | struct ipt_get_entries get; | |
e60a13e0 | 1137 | struct xt_table *t; |
2722971c DM |
1138 | |
1139 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1140 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1141 | return -EINVAL; |
1142 | } | |
1143 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1144 | return -EFAULT; | |
1145 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1146 | duprintf("get_entries: %u != %zu\n", |
1147 | *len, sizeof(get) + get.size); | |
2722971c DM |
1148 | return -EINVAL; |
1149 | } | |
1150 | ||
34bd137b | 1151 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1152 | if (t && !IS_ERR(t)) { |
5452e425 | 1153 | const struct xt_table_info *private = t->private; |
9c547959 | 1154 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1155 | if (get.size == private->size) |
1156 | ret = copy_entries_to_user(private->size, | |
1157 | t, uptr->entrytable); | |
1158 | else { | |
1159 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1160 | private->size, get.size); |
544473c1 | 1161 | ret = -EAGAIN; |
2722971c DM |
1162 | } |
1163 | module_put(t->me); | |
1164 | xt_table_unlock(t); | |
1165 | } else | |
1166 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1167 | ||
1168 | return ret; | |
1169 | } | |
1170 | ||
1171 | static int | |
34bd137b | 1172 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1173 | struct xt_table_info *newinfo, unsigned int num_counters, |
1174 | void __user *counters_ptr) | |
2722971c DM |
1175 | { |
1176 | int ret; | |
e60a13e0 | 1177 | struct xt_table *t; |
2722971c DM |
1178 | struct xt_table_info *oldinfo; |
1179 | struct xt_counters *counters; | |
1180 | void *loc_cpu_old_entry; | |
72b2b1dd | 1181 | struct ipt_entry *iter; |
2722971c DM |
1182 | |
1183 | ret = 0; | |
83723d60 | 1184 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
2722971c DM |
1185 | if (!counters) { |
1186 | ret = -ENOMEM; | |
1187 | goto out; | |
1188 | } | |
1189 | ||
34bd137b | 1190 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c DM |
1191 | "iptable_%s", name); |
1192 | if (!t || IS_ERR(t)) { | |
1193 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1194 | goto free_newinfo_counters_untrans; | |
1195 | } | |
1196 | ||
1197 | /* You lied! */ | |
1198 | if (valid_hooks != t->valid_hooks) { | |
1199 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1200 | valid_hooks, t->valid_hooks); | |
1201 | ret = -EINVAL; | |
1202 | goto put_module; | |
1203 | } | |
1204 | ||
1205 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1206 | if (!oldinfo) | |
1207 | goto put_module; | |
1208 | ||
1209 | /* Update module usage count based on number of rules */ | |
1210 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1211 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1212 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1213 | (newinfo->number <= oldinfo->initial_entries)) | |
1214 | module_put(t->me); | |
1215 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1216 | (newinfo->number <= oldinfo->initial_entries)) | |
1217 | module_put(t->me); | |
1218 | ||
942e4a2b | 1219 | /* Get the old counters, and synchronize with replace */ |
2722971c | 1220 | get_counters(oldinfo, counters); |
942e4a2b | 1221 | |
2722971c DM |
1222 | /* Decrease module usage counts and free resource */ |
1223 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
72b2b1dd | 1224 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1225 | cleanup_entry(iter, net); |
72b2b1dd | 1226 | |
2722971c DM |
1227 | xt_free_table_info(oldinfo); |
1228 | if (copy_to_user(counters_ptr, counters, | |
1229 | sizeof(struct xt_counters) * num_counters) != 0) | |
1230 | ret = -EFAULT; | |
1231 | vfree(counters); | |
1232 | xt_table_unlock(t); | |
1233 | return ret; | |
1234 | ||
1235 | put_module: | |
1236 | module_put(t->me); | |
1237 | xt_table_unlock(t); | |
1238 | free_newinfo_counters_untrans: | |
1239 | vfree(counters); | |
1240 | out: | |
1241 | return ret; | |
1242 | } | |
1243 | ||
1244 | static int | |
d5d1baa1 | 1245 | do_replace(struct net *net, const void __user *user, unsigned int len) |
2722971c DM |
1246 | { |
1247 | int ret; | |
1248 | struct ipt_replace tmp; | |
1249 | struct xt_table_info *newinfo; | |
1250 | void *loc_cpu_entry; | |
72b2b1dd | 1251 | struct ipt_entry *iter; |
2722971c DM |
1252 | |
1253 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1254 | return -EFAULT; | |
1255 | ||
2722971c | 1256 | /* overflow check */ |
2722971c DM |
1257 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1258 | return -ENOMEM; | |
78b79876 | 1259 | tmp.name[sizeof(tmp.name)-1] = 0; |
2722971c DM |
1260 | |
1261 | newinfo = xt_alloc_table_info(tmp.size); | |
1262 | if (!newinfo) | |
1263 | return -ENOMEM; | |
1264 | ||
9c547959 | 1265 | /* choose the copy that is on our node/cpu */ |
2722971c DM |
1266 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1267 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1268 | tmp.size) != 0) { | |
1269 | ret = -EFAULT; | |
1270 | goto free_newinfo; | |
1271 | } | |
1272 | ||
0f234214 | 1273 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
2722971c DM |
1274 | if (ret != 0) |
1275 | goto free_newinfo; | |
1276 | ||
ff67e4e4 | 1277 | duprintf("Translated table\n"); |
2722971c | 1278 | |
34bd137b | 1279 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1280 | tmp.num_counters, tmp.counters); |
2722971c DM |
1281 | if (ret) |
1282 | goto free_newinfo_untrans; | |
1283 | return 0; | |
1284 | ||
1285 | free_newinfo_untrans: | |
72b2b1dd | 1286 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1287 | cleanup_entry(iter, net); |
2722971c DM |
1288 | free_newinfo: |
1289 | xt_free_table_info(newinfo); | |
1290 | return ret; | |
1291 | } | |
1292 | ||
2722971c | 1293 | static int |
d5d1baa1 JE |
1294 | do_add_counters(struct net *net, const void __user *user, |
1295 | unsigned int len, int compat) | |
2722971c | 1296 | { |
942e4a2b | 1297 | unsigned int i, curcpu; |
2722971c DM |
1298 | struct xt_counters_info tmp; |
1299 | struct xt_counters *paddc; | |
1300 | unsigned int num_counters; | |
5452e425 | 1301 | const char *name; |
2722971c DM |
1302 | int size; |
1303 | void *ptmp; | |
e60a13e0 | 1304 | struct xt_table *t; |
5452e425 | 1305 | const struct xt_table_info *private; |
2722971c DM |
1306 | int ret = 0; |
1307 | void *loc_cpu_entry; | |
72b2b1dd | 1308 | struct ipt_entry *iter; |
7f5c6d4f | 1309 | unsigned int addend; |
2722971c DM |
1310 | #ifdef CONFIG_COMPAT |
1311 | struct compat_xt_counters_info compat_tmp; | |
1312 | ||
1313 | if (compat) { | |
1314 | ptmp = &compat_tmp; | |
1315 | size = sizeof(struct compat_xt_counters_info); | |
1316 | } else | |
1317 | #endif | |
1318 | { | |
1319 | ptmp = &tmp; | |
1320 | size = sizeof(struct xt_counters_info); | |
1321 | } | |
1322 | ||
1323 | if (copy_from_user(ptmp, user, size) != 0) | |
1324 | return -EFAULT; | |
1325 | ||
1326 | #ifdef CONFIG_COMPAT | |
1327 | if (compat) { | |
1328 | num_counters = compat_tmp.num_counters; | |
1329 | name = compat_tmp.name; | |
1330 | } else | |
1331 | #endif | |
1332 | { | |
1333 | num_counters = tmp.num_counters; | |
1334 | name = tmp.name; | |
1335 | } | |
1336 | ||
1337 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1338 | return -EINVAL; | |
1339 | ||
e12f8e29 | 1340 | paddc = vmalloc(len - size); |
2722971c DM |
1341 | if (!paddc) |
1342 | return -ENOMEM; | |
1343 | ||
1344 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1345 | ret = -EFAULT; | |
1346 | goto free; | |
1347 | } | |
1348 | ||
34bd137b | 1349 | t = xt_find_table_lock(net, AF_INET, name); |
2722971c DM |
1350 | if (!t || IS_ERR(t)) { |
1351 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1352 | goto free; | |
1353 | } | |
1354 | ||
942e4a2b | 1355 | local_bh_disable(); |
2722971c DM |
1356 | private = t->private; |
1357 | if (private->number != num_counters) { | |
1358 | ret = -EINVAL; | |
1359 | goto unlock_up_free; | |
1360 | } | |
1361 | ||
1362 | i = 0; | |
1363 | /* Choose the copy that is on our node */ | |
942e4a2b SH |
1364 | curcpu = smp_processor_id(); |
1365 | loc_cpu_entry = private->entries[curcpu]; | |
7f5c6d4f | 1366 | addend = xt_write_recseq_begin(); |
0559518b JE |
1367 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1368 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1369 | ++i; | |
1370 | } | |
7f5c6d4f | 1371 | xt_write_recseq_end(addend); |
2722971c | 1372 | unlock_up_free: |
942e4a2b | 1373 | local_bh_enable(); |
2722971c DM |
1374 | xt_table_unlock(t); |
1375 | module_put(t->me); | |
1376 | free: | |
1377 | vfree(paddc); | |
1378 | ||
1379 | return ret; | |
1380 | } | |
1381 | ||
1382 | #ifdef CONFIG_COMPAT | |
1383 | struct compat_ipt_replace { | |
12b00c2c | 1384 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1385 | u32 valid_hooks; |
1386 | u32 num_entries; | |
1387 | u32 size; | |
6e23ae2a PM |
1388 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1389 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c | 1390 | u32 num_counters; |
87a2e70d | 1391 | compat_uptr_t counters; /* struct xt_counters * */ |
2722971c DM |
1392 | struct compat_ipt_entry entries[0]; |
1393 | }; | |
1394 | ||
a18aa31b PM |
1395 | static int |
1396 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1397 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1398 | unsigned int i) |
2722971c | 1399 | { |
87a2e70d | 1400 | struct xt_entry_target *t; |
2722971c DM |
1401 | struct compat_ipt_entry __user *ce; |
1402 | u_int16_t target_offset, next_offset; | |
1403 | compat_uint_t origsize; | |
dcea992a JE |
1404 | const struct xt_entry_match *ematch; |
1405 | int ret = 0; | |
2722971c | 1406 | |
2722971c DM |
1407 | origsize = *size; |
1408 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
0559518b JE |
1409 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
1410 | copy_to_user(&ce->counters, &counters[i], | |
1411 | sizeof(counters[i])) != 0) | |
1412 | return -EFAULT; | |
a18aa31b | 1413 | |
2722971c | 1414 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1415 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1416 | ||
dcea992a JE |
1417 | xt_ematch_foreach(ematch, e) { |
1418 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1419 | if (ret != 0) | |
6bdb331b | 1420 | return ret; |
dcea992a | 1421 | } |
2722971c | 1422 | target_offset = e->target_offset - (origsize - *size); |
2722971c | 1423 | t = ipt_get_target(e); |
9fa492cd | 1424 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c | 1425 | if (ret) |
0559518b | 1426 | return ret; |
2722971c | 1427 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1428 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1429 | put_user(next_offset, &ce->next_offset) != 0) | |
1430 | return -EFAULT; | |
2722971c | 1431 | return 0; |
2722971c DM |
1432 | } |
1433 | ||
022748a9 | 1434 | static int |
87a2e70d | 1435 | compat_find_calc_match(struct xt_entry_match *m, |
4b478248 PM |
1436 | const char *name, |
1437 | const struct ipt_ip *ip, | |
1438 | unsigned int hookmask, | |
6bdb331b | 1439 | int *size) |
2722971c | 1440 | { |
6709dbbb | 1441 | struct xt_match *match; |
2722971c | 1442 | |
fd0ec0e6 JE |
1443 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
1444 | m->u.user.revision); | |
1445 | if (IS_ERR(match)) { | |
2722971c | 1446 | duprintf("compat_check_calc_match: `%s' not found\n", |
4b478248 | 1447 | m->u.user.name); |
fd0ec0e6 | 1448 | return PTR_ERR(match); |
2722971c DM |
1449 | } |
1450 | m->u.kernel.match = match; | |
9fa492cd | 1451 | *size += xt_compat_match_offset(match); |
4c1b52bc DM |
1452 | return 0; |
1453 | } | |
1454 | ||
0559518b | 1455 | static void compat_release_entry(struct compat_ipt_entry *e) |
4c1b52bc | 1456 | { |
87a2e70d | 1457 | struct xt_entry_target *t; |
dcea992a | 1458 | struct xt_entry_match *ematch; |
4c1b52bc | 1459 | |
4c1b52bc | 1460 | /* Cleanup all matches */ |
dcea992a | 1461 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1462 | module_put(ematch->u.kernel.match->me); |
73cd598d | 1463 | t = compat_ipt_get_target(e); |
4c1b52bc | 1464 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1465 | } |
1466 | ||
022748a9 | 1467 | static int |
73cd598d | 1468 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1469 | struct xt_table_info *newinfo, |
1470 | unsigned int *size, | |
d5d1baa1 JE |
1471 | const unsigned char *base, |
1472 | const unsigned char *limit, | |
1473 | const unsigned int *hook_entries, | |
1474 | const unsigned int *underflows, | |
4b478248 | 1475 | const char *name) |
2722971c | 1476 | { |
dcea992a | 1477 | struct xt_entry_match *ematch; |
87a2e70d | 1478 | struct xt_entry_target *t; |
6709dbbb | 1479 | struct xt_target *target; |
e5b5ef7d | 1480 | unsigned int entry_offset; |
b0a6363c PM |
1481 | unsigned int j; |
1482 | int ret, off, h; | |
2722971c DM |
1483 | |
1484 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1485 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
1486 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { | |
2722971c DM |
1487 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1488 | return -EINVAL; | |
1489 | } | |
1490 | ||
1491 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1492 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1493 | duprintf("checking: element %p size %u\n", |
1494 | e, e->next_offset); | |
1495 | return -EINVAL; | |
1496 | } | |
1497 | ||
73cd598d PM |
1498 | /* For purposes of check_entry casting the compat entry is fine */ |
1499 | ret = check_entry((struct ipt_entry *)e, name); | |
a96be246 DM |
1500 | if (ret) |
1501 | return ret; | |
590bdf7f | 1502 | |
30c08c41 | 1503 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1504 | entry_offset = (void *)e - (void *)base; |
1505 | j = 0; | |
dcea992a JE |
1506 | xt_ematch_foreach(ematch, e) { |
1507 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1508 | &e->ip, e->comefrom, &off); |
dcea992a | 1509 | if (ret != 0) |
6bdb331b JE |
1510 | goto release_matches; |
1511 | ++j; | |
dcea992a | 1512 | } |
2722971c | 1513 | |
73cd598d | 1514 | t = compat_ipt_get_target(e); |
d2a7b6ba JE |
1515 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
1516 | t->u.user.revision); | |
1517 | if (IS_ERR(target)) { | |
a96be246 | 1518 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1519 | t->u.user.name); |
d2a7b6ba | 1520 | ret = PTR_ERR(target); |
4c1b52bc | 1521 | goto release_matches; |
2722971c DM |
1522 | } |
1523 | t->u.kernel.target = target; | |
1524 | ||
9fa492cd | 1525 | off += xt_compat_target_offset(target); |
2722971c | 1526 | *size += off; |
b386d9f5 | 1527 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1528 | if (ret) |
1529 | goto out; | |
1530 | ||
1531 | /* Check hooks & underflows */ | |
6e23ae2a | 1532 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1533 | if ((unsigned char *)e - base == hook_entries[h]) |
1534 | newinfo->hook_entry[h] = hook_entries[h]; | |
1535 | if ((unsigned char *)e - base == underflows[h]) | |
1536 | newinfo->underflow[h] = underflows[h]; | |
1537 | } | |
1538 | ||
1539 | /* Clear counters and comefrom */ | |
73cd598d | 1540 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c | 1541 | e->comefrom = 0; |
2722971c | 1542 | return 0; |
bec71b16 | 1543 | |
2722971c | 1544 | out: |
bec71b16 | 1545 | module_put(t->u.kernel.target->me); |
4c1b52bc | 1546 | release_matches: |
6bdb331b JE |
1547 | xt_ematch_foreach(ematch, e) { |
1548 | if (j-- == 0) | |
dcea992a | 1549 | break; |
6bdb331b JE |
1550 | module_put(ematch->u.kernel.match->me); |
1551 | } | |
2722971c DM |
1552 | return ret; |
1553 | } | |
1554 | ||
4b478248 | 1555 | static int |
73cd598d | 1556 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1557 | unsigned int *size, const char *name, |
1558 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c | 1559 | { |
87a2e70d | 1560 | struct xt_entry_target *t; |
6709dbbb | 1561 | struct xt_target *target; |
2722971c DM |
1562 | struct ipt_entry *de; |
1563 | unsigned int origsize; | |
920b868a | 1564 | int ret, h; |
dcea992a | 1565 | struct xt_entry_match *ematch; |
2722971c DM |
1566 | |
1567 | ret = 0; | |
1568 | origsize = *size; | |
1569 | de = (struct ipt_entry *)*dstptr; | |
1570 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1571 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1572 | |
73cd598d | 1573 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1574 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1575 | ||
dcea992a JE |
1576 | xt_ematch_foreach(ematch, e) { |
1577 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1578 | if (ret != 0) | |
6bdb331b | 1579 | return ret; |
dcea992a | 1580 | } |
2722971c | 1581 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1582 | t = compat_ipt_get_target(e); |
2722971c | 1583 | target = t->u.kernel.target; |
9fa492cd | 1584 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1585 | |
1586 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1587 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1588 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1589 | newinfo->hook_entry[h] -= origsize - *size; | |
1590 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1591 | newinfo->underflow[h] -= origsize - *size; | |
1592 | } | |
f6677f43 DM |
1593 | return ret; |
1594 | } | |
1595 | ||
022748a9 | 1596 | static int |
0559518b | 1597 | compat_check_entry(struct ipt_entry *e, struct net *net, const char *name) |
f6677f43 | 1598 | { |
dcea992a | 1599 | struct xt_entry_match *ematch; |
9b4fce7a | 1600 | struct xt_mtchk_param mtpar; |
b0a6363c | 1601 | unsigned int j; |
dcea992a | 1602 | int ret = 0; |
f6677f43 | 1603 | |
4c1b52bc | 1604 | j = 0; |
a83d8e8d | 1605 | mtpar.net = net; |
9b4fce7a JE |
1606 | mtpar.table = name; |
1607 | mtpar.entryinfo = &e->ip; | |
1608 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1609 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 1610 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1611 | ret = check_match(ematch, &mtpar); |
dcea992a | 1612 | if (ret != 0) |
6bdb331b JE |
1613 | goto cleanup_matches; |
1614 | ++j; | |
dcea992a | 1615 | } |
4c1b52bc | 1616 | |
add67461 | 1617 | ret = check_target(e, net, name); |
4c1b52bc DM |
1618 | if (ret) |
1619 | goto cleanup_matches; | |
4c1b52bc DM |
1620 | return 0; |
1621 | ||
1622 | cleanup_matches: | |
6bdb331b JE |
1623 | xt_ematch_foreach(ematch, e) { |
1624 | if (j-- == 0) | |
dcea992a | 1625 | break; |
6bdb331b JE |
1626 | cleanup_match(ematch, net); |
1627 | } | |
4c1b52bc | 1628 | return ret; |
f6677f43 DM |
1629 | } |
1630 | ||
1da177e4 | 1631 | static int |
a83d8e8d AD |
1632 | translate_compat_table(struct net *net, |
1633 | const char *name, | |
4b478248 PM |
1634 | unsigned int valid_hooks, |
1635 | struct xt_table_info **pinfo, | |
1636 | void **pentry0, | |
1637 | unsigned int total_size, | |
1638 | unsigned int number, | |
1639 | unsigned int *hook_entries, | |
1640 | unsigned int *underflows) | |
1da177e4 | 1641 | { |
920b868a | 1642 | unsigned int i, j; |
2722971c DM |
1643 | struct xt_table_info *newinfo, *info; |
1644 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1645 | struct compat_ipt_entry *iter0; |
1646 | struct ipt_entry *iter1; | |
2722971c | 1647 | unsigned int size; |
0559518b | 1648 | int ret; |
1da177e4 | 1649 | |
2722971c DM |
1650 | info = *pinfo; |
1651 | entry0 = *pentry0; | |
1652 | size = total_size; | |
1653 | info->number = number; | |
1654 | ||
1655 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1656 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1657 | info->hook_entry[i] = 0xFFFFFFFF; |
1658 | info->underflow[i] = 0xFFFFFFFF; | |
1659 | } | |
1660 | ||
1661 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1662 | j = 0; |
2722971c | 1663 | xt_compat_lock(AF_INET); |
255d0dc3 | 1664 | xt_compat_init_offsets(AF_INET, number); |
2722971c | 1665 | /* Walk through entries, checking offsets. */ |
72b2b1dd JE |
1666 | xt_entry_foreach(iter0, entry0, total_size) { |
1667 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1668 | entry0, |
1669 | entry0 + total_size, | |
1670 | hook_entries, | |
1671 | underflows, | |
1672 | name); | |
72b2b1dd | 1673 | if (ret != 0) |
0559518b JE |
1674 | goto out_unlock; |
1675 | ++j; | |
72b2b1dd | 1676 | } |
2722971c DM |
1677 | |
1678 | ret = -EINVAL; | |
920b868a | 1679 | if (j != number) { |
2722971c | 1680 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1681 | j, number); |
2722971c DM |
1682 | goto out_unlock; |
1683 | } | |
1684 | ||
1685 | /* Check hooks all assigned */ | |
6e23ae2a | 1686 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1687 | /* Only hooks which are valid */ |
1688 | if (!(valid_hooks & (1 << i))) | |
1689 | continue; | |
1690 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1691 | duprintf("Invalid hook entry %u %u\n", | |
1692 | i, hook_entries[i]); | |
1693 | goto out_unlock; | |
1da177e4 | 1694 | } |
2722971c DM |
1695 | if (info->underflow[i] == 0xFFFFFFFF) { |
1696 | duprintf("Invalid underflow %u %u\n", | |
1697 | i, underflows[i]); | |
1698 | goto out_unlock; | |
1699 | } | |
1700 | } | |
1701 | ||
1702 | ret = -ENOMEM; | |
1703 | newinfo = xt_alloc_table_info(size); | |
1704 | if (!newinfo) | |
1705 | goto out_unlock; | |
1706 | ||
1707 | newinfo->number = number; | |
6e23ae2a | 1708 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1709 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1710 | newinfo->underflow[i] = info->underflow[i]; | |
1711 | } | |
1712 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1713 | pos = entry1; | |
4b478248 | 1714 | size = total_size; |
72b2b1dd | 1715 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1716 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1717 | name, newinfo, entry1); | |
72b2b1dd JE |
1718 | if (ret != 0) |
1719 | break; | |
1720 | } | |
b386d9f5 | 1721 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1722 | xt_compat_unlock(AF_INET); |
1723 | if (ret) | |
1724 | goto free_newinfo; | |
1725 | ||
1726 | ret = -ELOOP; | |
1727 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1728 | goto free_newinfo; | |
1729 | ||
4c1b52bc | 1730 | i = 0; |
72b2b1dd | 1731 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1732 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1733 | if (ret != 0) |
1734 | break; | |
0559518b | 1735 | ++i; |
cca77b7c FW |
1736 | if (strcmp(ipt_get_target(iter1)->u.user.name, |
1737 | XT_ERROR_TARGET) == 0) | |
1738 | ++newinfo->stacksize; | |
72b2b1dd | 1739 | } |
4c1b52bc | 1740 | if (ret) { |
72b2b1dd JE |
1741 | /* |
1742 | * The first i matches need cleanup_entry (calls ->destroy) | |
1743 | * because they had called ->check already. The other j-i | |
1744 | * entries need only release. | |
1745 | */ | |
1746 | int skip = i; | |
4c1b52bc | 1747 | j -= i; |
72b2b1dd JE |
1748 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1749 | if (skip-- > 0) | |
1750 | continue; | |
0559518b | 1751 | if (j-- == 0) |
72b2b1dd | 1752 | break; |
0559518b | 1753 | compat_release_entry(iter0); |
72b2b1dd | 1754 | } |
0559518b JE |
1755 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1756 | if (i-- == 0) | |
72b2b1dd | 1757 | break; |
0559518b JE |
1758 | cleanup_entry(iter1, net); |
1759 | } | |
4c1b52bc DM |
1760 | xt_free_table_info(newinfo); |
1761 | return ret; | |
1762 | } | |
f6677f43 | 1763 | |
2722971c | 1764 | /* And one copy for every other CPU */ |
fb1bb34d | 1765 | for_each_possible_cpu(i) |
2722971c DM |
1766 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1767 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1768 | ||
1769 | *pinfo = newinfo; | |
1770 | *pentry0 = entry1; | |
1771 | xt_free_table_info(info); | |
1772 | return 0; | |
1da177e4 | 1773 | |
2722971c DM |
1774 | free_newinfo: |
1775 | xt_free_table_info(newinfo); | |
1776 | out: | |
0559518b JE |
1777 | xt_entry_foreach(iter0, entry0, total_size) { |
1778 | if (j-- == 0) | |
72b2b1dd | 1779 | break; |
0559518b JE |
1780 | compat_release_entry(iter0); |
1781 | } | |
1da177e4 | 1782 | return ret; |
2722971c | 1783 | out_unlock: |
b386d9f5 | 1784 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1785 | xt_compat_unlock(AF_INET); |
1786 | goto out; | |
1da177e4 LT |
1787 | } |
1788 | ||
1789 | static int | |
34bd137b | 1790 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1791 | { |
1792 | int ret; | |
2722971c DM |
1793 | struct compat_ipt_replace tmp; |
1794 | struct xt_table_info *newinfo; | |
1795 | void *loc_cpu_entry; | |
72b2b1dd | 1796 | struct ipt_entry *iter; |
1da177e4 LT |
1797 | |
1798 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1799 | return -EFAULT; | |
1800 | ||
ee4bb818 | 1801 | /* overflow check */ |
259d4e41 | 1802 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1803 | return -ENOMEM; |
1804 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1805 | return -ENOMEM; | |
78b79876 | 1806 | tmp.name[sizeof(tmp.name)-1] = 0; |
ee4bb818 | 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 | ||
a83d8e8d | 1820 | ret = translate_compat_table(net, 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: |
72b2b1dd | 1836 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1837 | cleanup_entry(iter, net); |
2722971c DM |
1838 | free_newinfo: |
1839 | xt_free_table_info(newinfo); | |
1840 | return ret; | |
1841 | } | |
1da177e4 | 1842 | |
2722971c DM |
1843 | static int |
1844 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1845 | unsigned int len) |
2722971c DM |
1846 | { |
1847 | int ret; | |
1da177e4 | 1848 | |
2722971c DM |
1849 | if (!capable(CAP_NET_ADMIN)) |
1850 | return -EPERM; | |
1da177e4 | 1851 | |
2722971c DM |
1852 | switch (cmd) { |
1853 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1854 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1855 | break; |
1da177e4 | 1856 | |
2722971c | 1857 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1858 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1859 | break; |
1860 | ||
1861 | default: | |
1862 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1863 | ret = -EINVAL; | |
1864 | } | |
1da177e4 | 1865 | |
1da177e4 LT |
1866 | return ret; |
1867 | } | |
1868 | ||
4b478248 | 1869 | struct compat_ipt_get_entries { |
12b00c2c | 1870 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1871 | compat_uint_t size; |
1872 | struct compat_ipt_entry entrytable[0]; | |
1873 | }; | |
1da177e4 | 1874 | |
4b478248 PM |
1875 | static int |
1876 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1877 | void __user *userptr) | |
2722971c | 1878 | { |
2722971c | 1879 | struct xt_counters *counters; |
5452e425 | 1880 | const struct xt_table_info *private = table->private; |
2722971c DM |
1881 | void __user *pos; |
1882 | unsigned int size; | |
1883 | int ret = 0; | |
5452e425 | 1884 | const void *loc_cpu_entry; |
a18aa31b | 1885 | unsigned int i = 0; |
72b2b1dd | 1886 | struct ipt_entry *iter; |
1da177e4 | 1887 | |
2722971c DM |
1888 | counters = alloc_counters(table); |
1889 | if (IS_ERR(counters)) | |
1890 | return PTR_ERR(counters); | |
1891 | ||
1892 | /* choose the copy that is on our node/cpu, ... | |
1893 | * This choice is lazy (because current thread is | |
1894 | * allowed to migrate to another cpu) | |
1895 | */ | |
1896 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1897 | pos = userptr; | |
1898 | size = total_size; | |
72b2b1dd JE |
1899 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1900 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1901 | &size, counters, i++); |
72b2b1dd JE |
1902 | if (ret != 0) |
1903 | break; | |
1904 | } | |
2722971c | 1905 | |
2722971c DM |
1906 | vfree(counters); |
1907 | return ret; | |
1da177e4 LT |
1908 | } |
1909 | ||
1910 | static int | |
34bd137b AD |
1911 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1912 | int *len) | |
1da177e4 | 1913 | { |
2722971c DM |
1914 | int ret; |
1915 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1916 | struct xt_table *t; |
1da177e4 | 1917 | |
2722971c | 1918 | if (*len < sizeof(get)) { |
c9d8fe13 | 1919 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1920 | return -EINVAL; |
2722971c | 1921 | } |
1da177e4 | 1922 | |
2722971c DM |
1923 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1924 | return -EFAULT; | |
1da177e4 | 1925 | |
2722971c | 1926 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1927 | duprintf("compat_get_entries: %u != %zu\n", |
1928 | *len, sizeof(get) + get.size); | |
2722971c | 1929 | return -EINVAL; |
1da177e4 LT |
1930 | } |
1931 | ||
2722971c | 1932 | xt_compat_lock(AF_INET); |
34bd137b | 1933 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1934 | if (t && !IS_ERR(t)) { |
5452e425 | 1935 | const struct xt_table_info *private = t->private; |
2722971c | 1936 | struct xt_table_info info; |
9c547959 | 1937 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1938 | ret = compat_table_info(private, &info); |
1939 | if (!ret && get.size == info.size) { | |
1940 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 1941 | t, uptr->entrytable); |
2722971c DM |
1942 | } else if (!ret) { |
1943 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1944 | private->size, get.size); |
544473c1 | 1945 | ret = -EAGAIN; |
2722971c | 1946 | } |
b386d9f5 | 1947 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1948 | module_put(t->me); |
1949 | xt_table_unlock(t); | |
1950 | } else | |
1da177e4 | 1951 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1952 | |
2722971c DM |
1953 | xt_compat_unlock(AF_INET); |
1954 | return ret; | |
1955 | } | |
1da177e4 | 1956 | |
79030ed0 PM |
1957 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1958 | ||
2722971c DM |
1959 | static int |
1960 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1961 | { | |
1962 | int ret; | |
1da177e4 | 1963 | |
82fac054 BS |
1964 | if (!capable(CAP_NET_ADMIN)) |
1965 | return -EPERM; | |
1966 | ||
2722971c DM |
1967 | switch (cmd) { |
1968 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1969 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1970 | break; |
1971 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1972 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1973 | break; |
1974 | default: | |
79030ed0 | 1975 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1976 | } |
1da177e4 LT |
1977 | return ret; |
1978 | } | |
2722971c | 1979 | #endif |
1da177e4 LT |
1980 | |
1981 | static int | |
9c547959 | 1982 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
1983 | { |
1984 | int ret; | |
1985 | ||
1986 | if (!capable(CAP_NET_ADMIN)) | |
1987 | return -EPERM; | |
1988 | ||
1989 | switch (cmd) { | |
1990 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1991 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1992 | break; |
1993 | ||
1994 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1995 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
1996 | break; |
1997 | ||
1998 | default: | |
1999 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
2000 | ret = -EINVAL; | |
2001 | } | |
2002 | ||
2003 | return ret; | |
2004 | } | |
2005 | ||
2006 | static int | |
2007 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2008 | { | |
2009 | int ret; | |
2010 | ||
2011 | if (!capable(CAP_NET_ADMIN)) | |
2012 | return -EPERM; | |
2013 | ||
2014 | switch (cmd) { | |
2722971c | 2015 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2016 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2017 | break; |
1da177e4 | 2018 | |
2722971c | 2019 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2020 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2021 | break; |
1da177e4 LT |
2022 | |
2023 | case IPT_SO_GET_REVISION_MATCH: | |
2024 | case IPT_SO_GET_REVISION_TARGET: { | |
12b00c2c | 2025 | struct xt_get_revision rev; |
2e4e6a17 | 2026 | int target; |
1da177e4 LT |
2027 | |
2028 | if (*len != sizeof(rev)) { | |
2029 | ret = -EINVAL; | |
2030 | break; | |
2031 | } | |
2032 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2033 | ret = -EFAULT; | |
2034 | break; | |
2035 | } | |
78b79876 | 2036 | rev.name[sizeof(rev.name)-1] = 0; |
1da177e4 LT |
2037 | |
2038 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2039 | target = 1; |
1da177e4 | 2040 | else |
2e4e6a17 | 2041 | target = 0; |
1da177e4 | 2042 | |
2e4e6a17 HW |
2043 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2044 | rev.revision, | |
2045 | target, &ret), | |
1da177e4 LT |
2046 | "ipt_%s", rev.name); |
2047 | break; | |
2048 | } | |
2049 | ||
2050 | default: | |
2051 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2052 | ret = -EINVAL; | |
2053 | } | |
2054 | ||
2055 | return ret; | |
2056 | } | |
2057 | ||
35aad0ff JE |
2058 | struct xt_table *ipt_register_table(struct net *net, |
2059 | const struct xt_table *table, | |
44d34e72 | 2060 | const struct ipt_replace *repl) |
1da177e4 LT |
2061 | { |
2062 | int ret; | |
2e4e6a17 | 2063 | struct xt_table_info *newinfo; |
f3c5c1bf | 2064 | struct xt_table_info bootstrap = {0}; |
31836064 | 2065 | void *loc_cpu_entry; |
a98da11d | 2066 | struct xt_table *new_table; |
1da177e4 | 2067 | |
2e4e6a17 | 2068 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2069 | if (!newinfo) { |
2070 | ret = -ENOMEM; | |
2071 | goto out; | |
2072 | } | |
1da177e4 | 2073 | |
9c547959 | 2074 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2075 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2076 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2077 | |
0f234214 | 2078 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2079 | if (ret != 0) |
2080 | goto out_free; | |
1da177e4 | 2081 | |
44d34e72 | 2082 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2083 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2084 | ret = PTR_ERR(new_table); |
2085 | goto out_free; | |
1da177e4 LT |
2086 | } |
2087 | ||
44d34e72 AD |
2088 | return new_table; |
2089 | ||
2090 | out_free: | |
2091 | xt_free_table_info(newinfo); | |
2092 | out: | |
2093 | return ERR_PTR(ret); | |
1da177e4 LT |
2094 | } |
2095 | ||
f54e9367 | 2096 | void ipt_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2097 | { |
2e4e6a17 | 2098 | struct xt_table_info *private; |
31836064 | 2099 | void *loc_cpu_entry; |
df200969 | 2100 | struct module *table_owner = table->me; |
72b2b1dd | 2101 | struct ipt_entry *iter; |
31836064 | 2102 | |
e905a9ed | 2103 | private = xt_unregister_table(table); |
1da177e4 LT |
2104 | |
2105 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2106 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2107 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2108 | cleanup_entry(iter, net); |
df200969 AD |
2109 | if (private->number > private->initial_entries) |
2110 | module_put(table_owner); | |
2e4e6a17 | 2111 | xt_free_table_info(private); |
1da177e4 LT |
2112 | } |
2113 | ||
2114 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2115 | static inline bool |
1da177e4 LT |
2116 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2117 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2118 | bool invert) |
1da177e4 | 2119 | { |
9c547959 PM |
2120 | return ((test_type == 0xFF) || |
2121 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2122 | ^ invert; |
2123 | } | |
2124 | ||
1d93a9cb | 2125 | static bool |
62fc8051 | 2126 | icmp_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2127 | { |
5452e425 JE |
2128 | const struct icmphdr *ic; |
2129 | struct icmphdr _icmph; | |
f7108a20 | 2130 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2131 | |
2132 | /* Must not be a fragment. */ | |
f7108a20 | 2133 | if (par->fragoff != 0) |
1d93a9cb | 2134 | return false; |
1da177e4 | 2135 | |
f7108a20 | 2136 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2137 | if (ic == NULL) { |
2138 | /* We've been asked to examine this packet, and we | |
2139 | * can't. Hence, no choice but to drop. | |
2140 | */ | |
2141 | duprintf("Dropping evil ICMP tinygram.\n"); | |
b4ba2611 | 2142 | par->hotdrop = true; |
1d93a9cb | 2143 | return false; |
1da177e4 LT |
2144 | } |
2145 | ||
2146 | return icmp_type_code_match(icmpinfo->type, | |
2147 | icmpinfo->code[0], | |
2148 | icmpinfo->code[1], | |
2149 | ic->type, ic->code, | |
2150 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2151 | } | |
2152 | ||
b0f38452 | 2153 | static int icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2154 | { |
9b4fce7a | 2155 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2156 | |
1d5cd909 | 2157 | /* Must specify no unknown invflags */ |
bd414ee6 | 2158 | return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2159 | } |
2160 | ||
4538506b JE |
2161 | static struct xt_target ipt_builtin_tg[] __read_mostly = { |
2162 | { | |
243bf6e2 | 2163 | .name = XT_STANDARD_TARGET, |
4538506b JE |
2164 | .targetsize = sizeof(int), |
2165 | .family = NFPROTO_IPV4, | |
2722971c | 2166 | #ifdef CONFIG_COMPAT |
4538506b JE |
2167 | .compatsize = sizeof(compat_int_t), |
2168 | .compat_from_user = compat_standard_from_user, | |
2169 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2170 | #endif |
4538506b JE |
2171 | }, |
2172 | { | |
243bf6e2 | 2173 | .name = XT_ERROR_TARGET, |
4538506b | 2174 | .target = ipt_error, |
12b00c2c | 2175 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
2176 | .family = NFPROTO_IPV4, |
2177 | }, | |
1da177e4 LT |
2178 | }; |
2179 | ||
2180 | static struct nf_sockopt_ops ipt_sockopts = { | |
2181 | .pf = PF_INET, | |
2182 | .set_optmin = IPT_BASE_CTL, | |
2183 | .set_optmax = IPT_SO_SET_MAX+1, | |
2184 | .set = do_ipt_set_ctl, | |
2722971c DM |
2185 | #ifdef CONFIG_COMPAT |
2186 | .compat_set = compat_do_ipt_set_ctl, | |
2187 | #endif | |
1da177e4 LT |
2188 | .get_optmin = IPT_BASE_CTL, |
2189 | .get_optmax = IPT_SO_GET_MAX+1, | |
2190 | .get = do_ipt_get_ctl, | |
2722971c DM |
2191 | #ifdef CONFIG_COMPAT |
2192 | .compat_get = compat_do_ipt_get_ctl, | |
2193 | #endif | |
16fcec35 | 2194 | .owner = THIS_MODULE, |
1da177e4 LT |
2195 | }; |
2196 | ||
4538506b JE |
2197 | static struct xt_match ipt_builtin_mt[] __read_mostly = { |
2198 | { | |
2199 | .name = "icmp", | |
2200 | .match = icmp_match, | |
2201 | .matchsize = sizeof(struct ipt_icmp), | |
2202 | .checkentry = icmp_checkentry, | |
2203 | .proto = IPPROTO_ICMP, | |
2204 | .family = NFPROTO_IPV4, | |
2205 | }, | |
1da177e4 LT |
2206 | }; |
2207 | ||
3cb609d5 AD |
2208 | static int __net_init ip_tables_net_init(struct net *net) |
2209 | { | |
383ca5b8 | 2210 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
2211 | } |
2212 | ||
2213 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2214 | { | |
383ca5b8 | 2215 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
2216 | } |
2217 | ||
2218 | static struct pernet_operations ip_tables_net_ops = { | |
2219 | .init = ip_tables_net_init, | |
2220 | .exit = ip_tables_net_exit, | |
2221 | }; | |
2222 | ||
65b4b4e8 | 2223 | static int __init ip_tables_init(void) |
1da177e4 LT |
2224 | { |
2225 | int ret; | |
2226 | ||
3cb609d5 | 2227 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2228 | if (ret < 0) |
2229 | goto err1; | |
2e4e6a17 | 2230 | |
25985edc | 2231 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 2232 | ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 PM |
2233 | if (ret < 0) |
2234 | goto err2; | |
4538506b | 2235 | ret = xt_register_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 PM |
2236 | if (ret < 0) |
2237 | goto err4; | |
1da177e4 LT |
2238 | |
2239 | /* Register setsockopt */ | |
2240 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2241 | if (ret < 0) |
2242 | goto err5; | |
1da177e4 | 2243 | |
ff67e4e4 | 2244 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2245 | return 0; |
0eff66e6 PM |
2246 | |
2247 | err5: | |
4538506b | 2248 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 | 2249 | err4: |
4538506b | 2250 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 | 2251 | err2: |
3cb609d5 | 2252 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2253 | err1: |
2254 | return ret; | |
1da177e4 LT |
2255 | } |
2256 | ||
65b4b4e8 | 2257 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2258 | { |
2259 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2260 | |
4538506b JE |
2261 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
2262 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); | |
3cb609d5 | 2263 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2264 | } |
2265 | ||
2266 | EXPORT_SYMBOL(ipt_register_table); | |
2267 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2268 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2269 | module_init(ip_tables_init); |
2270 | module_exit(ip_tables_fini); |