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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 | ||
f0165888 | 185 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
022748a9 | 186 | static const char *const hooknames[] = { |
6e23ae2a PM |
187 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
188 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 189 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
190 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
191 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
192 | }; |
193 | ||
194 | enum nf_ip_trace_comments { | |
195 | NF_IP_TRACE_COMMENT_RULE, | |
196 | NF_IP_TRACE_COMMENT_RETURN, | |
197 | NF_IP_TRACE_COMMENT_POLICY, | |
198 | }; | |
199 | ||
022748a9 | 200 | static const char *const comments[] = { |
ba9dda3a JK |
201 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
202 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
203 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
204 | }; | |
205 | ||
206 | static struct nf_loginfo trace_loginfo = { | |
207 | .type = NF_LOG_TYPE_LOG, | |
208 | .u = { | |
209 | .log = { | |
210 | .level = 4, | |
211 | .logflags = NF_LOG_MASK, | |
212 | }, | |
213 | }, | |
214 | }; | |
215 | ||
022748a9 | 216 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 217 | static inline int |
d5d1baa1 | 218 | get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e, |
4f2f6f23 JE |
219 | const char *hookname, const char **chainname, |
220 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 221 | { |
87a2e70d | 222 | const struct xt_standard_target *t = (void *)ipt_get_target_c(s); |
ba9dda3a | 223 | |
243bf6e2 | 224 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
225 | /* Head of user chain: ERROR target with chainname */ |
226 | *chainname = t->target.data; | |
227 | (*rulenum) = 0; | |
228 | } else if (s == e) { | |
229 | (*rulenum)++; | |
230 | ||
3666ed1c JP |
231 | if (s->target_offset == sizeof(struct ipt_entry) && |
232 | strcmp(t->target.u.kernel.target->name, | |
243bf6e2 | 233 | XT_STANDARD_TARGET) == 0 && |
3666ed1c JP |
234 | t->verdict < 0 && |
235 | unconditional(&s->ip)) { | |
ba9dda3a JK |
236 | /* Tail of chains: STANDARD target (return/policy) */ |
237 | *comment = *chainname == hookname | |
4f2f6f23 JE |
238 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
239 | : comments[NF_IP_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
240 | } |
241 | return 1; | |
242 | } else | |
243 | (*rulenum)++; | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
d5d1baa1 | 248 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
249 | unsigned int hook, |
250 | const struct net_device *in, | |
251 | const struct net_device *out, | |
ecb6f85e | 252 | const char *tablename, |
d5d1baa1 JE |
253 | const struct xt_table_info *private, |
254 | const struct ipt_entry *e) | |
ba9dda3a | 255 | { |
d5d1baa1 | 256 | const void *table_base; |
5452e425 | 257 | const struct ipt_entry *root; |
4f2f6f23 | 258 | const char *hookname, *chainname, *comment; |
72b2b1dd | 259 | const struct ipt_entry *iter; |
ba9dda3a | 260 | unsigned int rulenum = 0; |
30e0c6a6 | 261 | struct net *net = dev_net(in ? in : out); |
ba9dda3a | 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 | 273 | |
30e0c6a6 | 274 | nf_log_packet(net, AF_INET, hook, skb, in, out, &trace_loginfo, |
ba9dda3a JK |
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 | 363 | |
f0165888 | 364 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
365 | /* The packet is traced: log it */ |
366 | if (unlikely(skb->nf_trace)) | |
367 | trace_packet(skb, hook, in, out, | |
368 | table->name, private, e); | |
ba9dda3a | 369 | #endif |
a1ff4ac8 JE |
370 | /* Standard target? */ |
371 | if (!t->u.kernel.target->target) { | |
372 | int v; | |
373 | ||
87a2e70d | 374 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
375 | if (v < 0) { |
376 | /* Pop from stack? */ | |
243bf6e2 | 377 | if (v != XT_RETURN) { |
95c96174 | 378 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 379 | break; |
1da177e4 | 380 | } |
db856674 | 381 | if (*stackptr <= origptr) { |
f3c5c1bf JE |
382 | e = get_entry(table_base, |
383 | private->underflow[hook]); | |
cecc74de | 384 | pr_debug("Underflow (this is normal) " |
f3c5c1bf JE |
385 | "to %p\n", e); |
386 | } else { | |
387 | e = jumpstack[--*stackptr]; | |
cecc74de | 388 | pr_debug("Pulled %p out from pos %u\n", |
f3c5c1bf JE |
389 | e, *stackptr); |
390 | e = ipt_next_entry(e); | |
391 | } | |
a1ff4ac8 JE |
392 | continue; |
393 | } | |
3666ed1c JP |
394 | if (table_base + v != ipt_next_entry(e) && |
395 | !(e->ip.flags & IPT_F_GOTO)) { | |
f3c5c1bf JE |
396 | if (*stackptr >= private->stacksize) { |
397 | verdict = NF_DROP; | |
398 | break; | |
399 | } | |
400 | jumpstack[(*stackptr)++] = e; | |
cecc74de | 401 | pr_debug("Pushed %p into pos %u\n", |
f3c5c1bf | 402 | e, *stackptr - 1); |
a1ff4ac8 | 403 | } |
1da177e4 | 404 | |
a1ff4ac8 | 405 | e = get_entry(table_base, v); |
7a6b1c46 JE |
406 | continue; |
407 | } | |
408 | ||
de74c169 JE |
409 | acpar.target = t->u.kernel.target; |
410 | acpar.targinfo = t->data; | |
bb70dfa5 | 411 | |
de74c169 | 412 | verdict = t->u.kernel.target->target(skb, &acpar); |
7a6b1c46 JE |
413 | /* Target might have changed stuff. */ |
414 | ip = ip_hdr(skb); | |
243bf6e2 | 415 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
416 | e = ipt_next_entry(e); |
417 | else | |
418 | /* Verdict */ | |
419 | break; | |
b4ba2611 | 420 | } while (!acpar.hotdrop); |
cecc74de | 421 | pr_debug("Exiting %s; resetting sp from %u to %u\n", |
f3c5c1bf JE |
422 | __func__, *stackptr, origptr); |
423 | *stackptr = origptr; | |
7f5c6d4f ED |
424 | xt_write_recseq_end(addend); |
425 | local_bh_enable(); | |
426 | ||
1da177e4 LT |
427 | #ifdef DEBUG_ALLOW_ALL |
428 | return NF_ACCEPT; | |
429 | #else | |
b4ba2611 | 430 | if (acpar.hotdrop) |
1da177e4 LT |
431 | return NF_DROP; |
432 | else return verdict; | |
433 | #endif | |
434 | } | |
435 | ||
1da177e4 LT |
436 | /* Figures out from what hook each rule can be called: returns 0 if |
437 | there are loops. Puts hook bitmask in comefrom. */ | |
438 | static int | |
d5d1baa1 | 439 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 440 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
441 | { |
442 | unsigned int hook; | |
443 | ||
444 | /* No recursion; use packet counter to save back ptrs (reset | |
445 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 446 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 447 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 448 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
449 | |
450 | if (!(valid_hooks & (1 << hook))) | |
451 | continue; | |
452 | ||
453 | /* Set initial back pointer. */ | |
454 | e->counters.pcnt = pos; | |
455 | ||
456 | for (;;) { | |
87a2e70d | 457 | const struct xt_standard_target *t |
d5d1baa1 | 458 | = (void *)ipt_get_target_c(e); |
e1b4b9f3 | 459 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 460 | |
6e23ae2a | 461 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
654d0fbd | 462 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
463 | hook, pos, e->comefrom); |
464 | return 0; | |
465 | } | |
9c547959 | 466 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
467 | |
468 | /* Unconditional return/END. */ | |
3666ed1c JP |
469 | if ((e->target_offset == sizeof(struct ipt_entry) && |
470 | (strcmp(t->target.u.user.name, | |
243bf6e2 | 471 | XT_STANDARD_TARGET) == 0) && |
3666ed1c JP |
472 | t->verdict < 0 && unconditional(&e->ip)) || |
473 | visited) { | |
1da177e4 LT |
474 | unsigned int oldpos, size; |
475 | ||
1f9352ae | 476 | if ((strcmp(t->target.u.user.name, |
243bf6e2 | 477 | XT_STANDARD_TARGET) == 0) && |
1f9352ae | 478 | t->verdict < -NF_MAX_VERDICT - 1) { |
74c9c0c1 DM |
479 | duprintf("mark_source_chains: bad " |
480 | "negative verdict (%i)\n", | |
481 | t->verdict); | |
482 | return 0; | |
483 | } | |
484 | ||
1da177e4 LT |
485 | /* Return: backtrack through the last |
486 | big jump. */ | |
487 | do { | |
6e23ae2a | 488 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
489 | #ifdef DEBUG_IP_FIREWALL_USER |
490 | if (e->comefrom | |
6e23ae2a | 491 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
492 | duprintf("Back unset " |
493 | "on hook %u " | |
494 | "rule %u\n", | |
495 | hook, pos); | |
496 | } | |
497 | #endif | |
498 | oldpos = pos; | |
499 | pos = e->counters.pcnt; | |
500 | e->counters.pcnt = 0; | |
501 | ||
502 | /* We're at the start. */ | |
503 | if (pos == oldpos) | |
504 | goto next; | |
505 | ||
506 | e = (struct ipt_entry *) | |
31836064 | 507 | (entry0 + pos); |
1da177e4 LT |
508 | } while (oldpos == pos + e->next_offset); |
509 | ||
510 | /* Move along one */ | |
511 | size = e->next_offset; | |
512 | e = (struct ipt_entry *) | |
31836064 | 513 | (entry0 + pos + size); |
1da177e4 LT |
514 | e->counters.pcnt = pos; |
515 | pos += size; | |
516 | } else { | |
517 | int newpos = t->verdict; | |
518 | ||
519 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 520 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 521 | newpos >= 0) { |
74c9c0c1 DM |
522 | if (newpos > newinfo->size - |
523 | sizeof(struct ipt_entry)) { | |
524 | duprintf("mark_source_chains: " | |
525 | "bad verdict (%i)\n", | |
526 | newpos); | |
527 | return 0; | |
528 | } | |
1da177e4 LT |
529 | /* This a jump; chase it. */ |
530 | duprintf("Jump rule %u -> %u\n", | |
531 | pos, newpos); | |
532 | } else { | |
533 | /* ... this is a fallthru */ | |
534 | newpos = pos + e->next_offset; | |
535 | } | |
536 | e = (struct ipt_entry *) | |
31836064 | 537 | (entry0 + newpos); |
1da177e4 LT |
538 | e->counters.pcnt = pos; |
539 | pos = newpos; | |
540 | } | |
541 | } | |
542 | next: | |
543 | duprintf("Finished chain %u\n", hook); | |
544 | } | |
545 | return 1; | |
546 | } | |
547 | ||
87a2e70d | 548 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 549 | { |
6be3d859 JE |
550 | struct xt_mtdtor_param par; |
551 | ||
f54e9367 | 552 | par.net = net; |
6be3d859 JE |
553 | par.match = m->u.kernel.match; |
554 | par.matchinfo = m->data; | |
916a917d | 555 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
556 | if (par.match->destroy != NULL) |
557 | par.match->destroy(&par); | |
558 | module_put(par.match->me); | |
1da177e4 LT |
559 | } |
560 | ||
022748a9 | 561 | static int |
d5d1baa1 | 562 | check_entry(const struct ipt_entry *e, const char *name) |
a96be246 | 563 | { |
87a2e70d | 564 | const struct xt_entry_target *t; |
a96be246 DM |
565 | |
566 | if (!ip_checkentry(&e->ip)) { | |
63f6fe92 | 567 | duprintf("ip check failed %p %s.\n", e, name); |
a96be246 DM |
568 | return -EINVAL; |
569 | } | |
570 | ||
87a2e70d | 571 | if (e->target_offset + sizeof(struct xt_entry_target) > |
9c547959 | 572 | e->next_offset) |
a96be246 DM |
573 | return -EINVAL; |
574 | ||
d5d1baa1 | 575 | t = ipt_get_target_c(e); |
a96be246 DM |
576 | if (e->target_offset + t->u.target_size > e->next_offset) |
577 | return -EINVAL; | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
022748a9 | 582 | static int |
87a2e70d | 583 | check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
a96be246 | 584 | { |
9b4fce7a | 585 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 DM |
586 | int ret; |
587 | ||
9b4fce7a JE |
588 | par->match = m->u.kernel.match; |
589 | par->matchinfo = m->data; | |
590 | ||
916a917d | 591 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 592 | ip->proto, ip->invflags & IPT_INV_PROTO); |
367c6790 | 593 | if (ret < 0) { |
b5cad0df | 594 | duprintf("check failed for `%s'.\n", par->match->name); |
367c6790 | 595 | return ret; |
a96be246 | 596 | } |
367c6790 | 597 | return 0; |
a96be246 DM |
598 | } |
599 | ||
022748a9 | 600 | static int |
87a2e70d | 601 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 602 | { |
6709dbbb | 603 | struct xt_match *match; |
3cdc7c95 | 604 | int ret; |
1da177e4 | 605 | |
fd0ec0e6 JE |
606 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
607 | m->u.user.revision); | |
608 | if (IS_ERR(match)) { | |
a96be246 | 609 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 610 | return PTR_ERR(match); |
1da177e4 LT |
611 | } |
612 | m->u.kernel.match = match; | |
613 | ||
6bdb331b | 614 | ret = check_match(m, par); |
3cdc7c95 PM |
615 | if (ret) |
616 | goto err; | |
617 | ||
1da177e4 | 618 | return 0; |
3cdc7c95 PM |
619 | err: |
620 | module_put(m->u.kernel.match->me); | |
621 | return ret; | |
1da177e4 LT |
622 | } |
623 | ||
add67461 | 624 | static int check_target(struct ipt_entry *e, struct net *net, const char *name) |
a96be246 | 625 | { |
87a2e70d | 626 | struct xt_entry_target *t = ipt_get_target(e); |
af5d6dc2 | 627 | struct xt_tgchk_param par = { |
add67461 | 628 | .net = net, |
af5d6dc2 JE |
629 | .table = name, |
630 | .entryinfo = e, | |
631 | .target = t->u.kernel.target, | |
632 | .targinfo = t->data, | |
633 | .hook_mask = e->comefrom, | |
916a917d | 634 | .family = NFPROTO_IPV4, |
af5d6dc2 | 635 | }; |
e905a9ed | 636 | int ret; |
a96be246 | 637 | |
916a917d | 638 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 639 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
367c6790 | 640 | if (ret < 0) { |
ff67e4e4 | 641 | duprintf("check failed for `%s'.\n", |
a96be246 | 642 | t->u.kernel.target->name); |
367c6790 | 643 | return ret; |
a96be246 | 644 | } |
367c6790 | 645 | return 0; |
a96be246 | 646 | } |
1da177e4 | 647 | |
022748a9 | 648 | static int |
a83d8e8d | 649 | find_check_entry(struct ipt_entry *e, struct net *net, const char *name, |
0559518b | 650 | unsigned int size) |
1da177e4 | 651 | { |
87a2e70d | 652 | struct xt_entry_target *t; |
6709dbbb | 653 | struct xt_target *target; |
1da177e4 LT |
654 | int ret; |
655 | unsigned int j; | |
9b4fce7a | 656 | struct xt_mtchk_param mtpar; |
dcea992a | 657 | struct xt_entry_match *ematch; |
1da177e4 | 658 | |
a96be246 DM |
659 | ret = check_entry(e, name); |
660 | if (ret) | |
661 | return ret; | |
590bdf7f | 662 | |
1da177e4 | 663 | j = 0; |
a83d8e8d | 664 | mtpar.net = net; |
9b4fce7a JE |
665 | mtpar.table = name; |
666 | mtpar.entryinfo = &e->ip; | |
667 | mtpar.hook_mask = e->comefrom; | |
916a917d | 668 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 669 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 670 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 671 | if (ret != 0) |
6bdb331b JE |
672 | goto cleanup_matches; |
673 | ++j; | |
dcea992a | 674 | } |
1da177e4 LT |
675 | |
676 | t = ipt_get_target(e); | |
d2a7b6ba JE |
677 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
678 | t->u.user.revision); | |
679 | if (IS_ERR(target)) { | |
a96be246 | 680 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 681 | ret = PTR_ERR(target); |
1da177e4 LT |
682 | goto cleanup_matches; |
683 | } | |
684 | t->u.kernel.target = target; | |
685 | ||
add67461 | 686 | ret = check_target(e, net, name); |
3cdc7c95 PM |
687 | if (ret) |
688 | goto err; | |
1da177e4 | 689 | return 0; |
3cdc7c95 PM |
690 | err: |
691 | module_put(t->u.kernel.target->me); | |
1da177e4 | 692 | cleanup_matches: |
6bdb331b JE |
693 | xt_ematch_foreach(ematch, e) { |
694 | if (j-- == 0) | |
dcea992a | 695 | break; |
6bdb331b JE |
696 | cleanup_match(ematch, net); |
697 | } | |
1da177e4 LT |
698 | return ret; |
699 | } | |
700 | ||
d5d1baa1 | 701 | static bool check_underflow(const struct ipt_entry *e) |
e2fe35c1 | 702 | { |
87a2e70d | 703 | const struct xt_entry_target *t; |
e2fe35c1 JE |
704 | unsigned int verdict; |
705 | ||
706 | if (!unconditional(&e->ip)) | |
707 | return false; | |
d5d1baa1 | 708 | t = ipt_get_target_c(e); |
e2fe35c1 JE |
709 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
710 | return false; | |
87a2e70d | 711 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
712 | verdict = -verdict - 1; |
713 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
714 | } | |
715 | ||
022748a9 | 716 | static int |
1da177e4 | 717 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 718 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
719 | const unsigned char *base, |
720 | const unsigned char *limit, | |
1da177e4 LT |
721 | const unsigned int *hook_entries, |
722 | const unsigned int *underflows, | |
0559518b | 723 | unsigned int valid_hooks) |
1da177e4 LT |
724 | { |
725 | unsigned int h; | |
726 | ||
3666ed1c JP |
727 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 || |
728 | (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { | |
1da177e4 LT |
729 | duprintf("Bad offset %p\n", e); |
730 | return -EINVAL; | |
731 | } | |
732 | ||
733 | if (e->next_offset | |
87a2e70d | 734 | < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target)) { |
1da177e4 LT |
735 | duprintf("checking: element %p size %u\n", |
736 | e, e->next_offset); | |
737 | return -EINVAL; | |
738 | } | |
739 | ||
740 | /* Check hooks & underflows */ | |
6e23ae2a | 741 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
742 | if (!(valid_hooks & (1 << h))) |
743 | continue; | |
1da177e4 LT |
744 | if ((unsigned char *)e - base == hook_entries[h]) |
745 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 746 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
747 | if (!check_underflow(e)) { |
748 | pr_err("Underflows must be unconditional and " | |
749 | "use the STANDARD target with " | |
750 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
751 | return -EINVAL; |
752 | } | |
1da177e4 | 753 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 754 | } |
1da177e4 LT |
755 | } |
756 | ||
1da177e4 | 757 | /* Clear counters and comefrom */ |
2e4e6a17 | 758 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 759 | e->comefrom = 0; |
1da177e4 LT |
760 | return 0; |
761 | } | |
762 | ||
0559518b JE |
763 | static void |
764 | cleanup_entry(struct ipt_entry *e, struct net *net) | |
1da177e4 | 765 | { |
a2df1648 | 766 | struct xt_tgdtor_param par; |
87a2e70d | 767 | struct xt_entry_target *t; |
dcea992a | 768 | struct xt_entry_match *ematch; |
1da177e4 | 769 | |
1da177e4 | 770 | /* Cleanup all matches */ |
dcea992a | 771 | xt_ematch_foreach(ematch, e) |
6bdb331b | 772 | cleanup_match(ematch, net); |
1da177e4 | 773 | t = ipt_get_target(e); |
a2df1648 | 774 | |
add67461 | 775 | par.net = net; |
a2df1648 JE |
776 | par.target = t->u.kernel.target; |
777 | par.targinfo = t->data; | |
916a917d | 778 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
779 | if (par.target->destroy != NULL) |
780 | par.target->destroy(&par); | |
781 | module_put(par.target->me); | |
1da177e4 LT |
782 | } |
783 | ||
784 | /* Checks and translates the user-supplied table segment (held in | |
785 | newinfo) */ | |
786 | static int | |
0f234214 JE |
787 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
788 | const struct ipt_replace *repl) | |
1da177e4 | 789 | { |
72b2b1dd | 790 | struct ipt_entry *iter; |
1da177e4 | 791 | unsigned int i; |
72b2b1dd | 792 | int ret = 0; |
1da177e4 | 793 | |
0f234214 JE |
794 | newinfo->size = repl->size; |
795 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
796 | |
797 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 798 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
799 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
800 | newinfo->underflow[i] = 0xFFFFFFFF; | |
801 | } | |
802 | ||
803 | duprintf("translate_table: size %u\n", newinfo->size); | |
804 | i = 0; | |
805 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
806 | xt_entry_foreach(iter, entry0, newinfo->size) { |
807 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
808 | entry0 + repl->size, |
809 | repl->hook_entry, | |
810 | repl->underflow, | |
811 | repl->valid_hooks); | |
72b2b1dd | 812 | if (ret != 0) |
0559518b JE |
813 | return ret; |
814 | ++i; | |
f3c5c1bf JE |
815 | if (strcmp(ipt_get_target(iter)->u.user.name, |
816 | XT_ERROR_TARGET) == 0) | |
817 | ++newinfo->stacksize; | |
72b2b1dd | 818 | } |
1da177e4 | 819 | |
0f234214 | 820 | if (i != repl->num_entries) { |
1da177e4 | 821 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 822 | i, repl->num_entries); |
1da177e4 LT |
823 | return -EINVAL; |
824 | } | |
825 | ||
826 | /* Check hooks all assigned */ | |
6e23ae2a | 827 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 828 | /* Only hooks which are valid */ |
0f234214 | 829 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
830 | continue; |
831 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
832 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 833 | i, repl->hook_entry[i]); |
1da177e4 LT |
834 | return -EINVAL; |
835 | } | |
836 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
837 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 838 | i, repl->underflow[i]); |
1da177e4 LT |
839 | return -EINVAL; |
840 | } | |
841 | } | |
842 | ||
0f234214 | 843 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
844 | return -ELOOP; |
845 | ||
1da177e4 LT |
846 | /* Finally, each sanity check must pass */ |
847 | i = 0; | |
72b2b1dd | 848 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 849 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
850 | if (ret != 0) |
851 | break; | |
0559518b | 852 | ++i; |
72b2b1dd | 853 | } |
1da177e4 | 854 | |
74c9c0c1 | 855 | if (ret != 0) { |
0559518b JE |
856 | xt_entry_foreach(iter, entry0, newinfo->size) { |
857 | if (i-- == 0) | |
72b2b1dd | 858 | break; |
0559518b JE |
859 | cleanup_entry(iter, net); |
860 | } | |
74c9c0c1 DM |
861 | return ret; |
862 | } | |
1da177e4 LT |
863 | |
864 | /* And one copy for every other CPU */ | |
6f912042 | 865 | for_each_possible_cpu(i) { |
31836064 ED |
866 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
867 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
868 | } |
869 | ||
870 | return ret; | |
871 | } | |
872 | ||
1da177e4 | 873 | static void |
2e4e6a17 HW |
874 | get_counters(const struct xt_table_info *t, |
875 | struct xt_counters counters[]) | |
1da177e4 | 876 | { |
72b2b1dd | 877 | struct ipt_entry *iter; |
1da177e4 LT |
878 | unsigned int cpu; |
879 | unsigned int i; | |
880 | ||
6f912042 | 881 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 882 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 883 | |
1da177e4 | 884 | i = 0; |
0559518b | 885 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
83723d60 ED |
886 | u64 bcnt, pcnt; |
887 | unsigned int start; | |
888 | ||
889 | do { | |
7f5c6d4f | 890 | start = read_seqcount_begin(s); |
83723d60 ED |
891 | bcnt = iter->counters.bcnt; |
892 | pcnt = iter->counters.pcnt; | |
7f5c6d4f | 893 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
894 | |
895 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
896 | ++i; /* macro does multi eval of i */ |
897 | } | |
1da177e4 | 898 | } |
78454473 SH |
899 | } |
900 | ||
d5d1baa1 | 901 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 902 | { |
2722971c | 903 | unsigned int countersize; |
2e4e6a17 | 904 | struct xt_counters *counters; |
d5d1baa1 | 905 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
906 | |
907 | /* We need atomic snapshot of counters: rest doesn't change | |
908 | (other than comefrom, which userspace doesn't care | |
909 | about). */ | |
2e4e6a17 | 910 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 911 | counters = vzalloc(countersize); |
1da177e4 LT |
912 | |
913 | if (counters == NULL) | |
942e4a2b | 914 | return ERR_PTR(-ENOMEM); |
78454473 | 915 | |
942e4a2b | 916 | get_counters(private, counters); |
1da177e4 | 917 | |
2722971c DM |
918 | return counters; |
919 | } | |
920 | ||
921 | static int | |
922 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 923 | const struct xt_table *table, |
2722971c DM |
924 | void __user *userptr) |
925 | { | |
926 | unsigned int off, num; | |
d5d1baa1 | 927 | const struct ipt_entry *e; |
2722971c | 928 | struct xt_counters *counters; |
5452e425 | 929 | const struct xt_table_info *private = table->private; |
2722971c | 930 | int ret = 0; |
5452e425 | 931 | const void *loc_cpu_entry; |
2722971c DM |
932 | |
933 | counters = alloc_counters(table); | |
934 | if (IS_ERR(counters)) | |
935 | return PTR_ERR(counters); | |
936 | ||
31836064 ED |
937 | /* choose the copy that is on our node/cpu, ... |
938 | * This choice is lazy (because current thread is | |
939 | * allowed to migrate to another cpu) | |
940 | */ | |
2e4e6a17 | 941 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 942 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
943 | ret = -EFAULT; |
944 | goto free_counters; | |
945 | } | |
946 | ||
947 | /* FIXME: use iterator macros --RR */ | |
948 | /* ... then go back and fix counters and names */ | |
949 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
950 | unsigned int i; | |
87a2e70d JE |
951 | const struct xt_entry_match *m; |
952 | const struct xt_entry_target *t; | |
1da177e4 | 953 | |
31836064 | 954 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
955 | if (copy_to_user(userptr + off |
956 | + offsetof(struct ipt_entry, counters), | |
957 | &counters[num], | |
958 | sizeof(counters[num])) != 0) { | |
959 | ret = -EFAULT; | |
960 | goto free_counters; | |
961 | } | |
962 | ||
963 | for (i = sizeof(struct ipt_entry); | |
964 | i < e->target_offset; | |
965 | i += m->u.match_size) { | |
966 | m = (void *)e + i; | |
967 | ||
968 | if (copy_to_user(userptr + off + i | |
87a2e70d | 969 | + offsetof(struct xt_entry_match, |
1da177e4 LT |
970 | u.user.name), |
971 | m->u.kernel.match->name, | |
972 | strlen(m->u.kernel.match->name)+1) | |
973 | != 0) { | |
974 | ret = -EFAULT; | |
975 | goto free_counters; | |
976 | } | |
977 | } | |
978 | ||
d5d1baa1 | 979 | t = ipt_get_target_c(e); |
1da177e4 | 980 | if (copy_to_user(userptr + off + e->target_offset |
87a2e70d | 981 | + offsetof(struct xt_entry_target, |
1da177e4 LT |
982 | u.user.name), |
983 | t->u.kernel.target->name, | |
984 | strlen(t->u.kernel.target->name)+1) != 0) { | |
985 | ret = -EFAULT; | |
986 | goto free_counters; | |
987 | } | |
988 | } | |
989 | ||
990 | free_counters: | |
991 | vfree(counters); | |
992 | return ret; | |
993 | } | |
994 | ||
2722971c | 995 | #ifdef CONFIG_COMPAT |
739674fb | 996 | static void compat_standard_from_user(void *dst, const void *src) |
2722971c | 997 | { |
9fa492cd | 998 | int v = *(compat_int_t *)src; |
2722971c | 999 | |
9fa492cd | 1000 | if (v > 0) |
b386d9f5 | 1001 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1002 | memcpy(dst, &v, sizeof(v)); |
1003 | } | |
46c5ea3c | 1004 | |
739674fb | 1005 | static int compat_standard_to_user(void __user *dst, const void *src) |
2722971c | 1006 | { |
9fa492cd | 1007 | compat_int_t cv = *(int *)src; |
2722971c | 1008 | |
9fa492cd | 1009 | if (cv > 0) |
b386d9f5 | 1010 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1011 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1012 | } |
1013 | ||
d5d1baa1 | 1014 | static int compat_calc_entry(const struct ipt_entry *e, |
4b478248 | 1015 | const struct xt_table_info *info, |
d5d1baa1 | 1016 | const void *base, struct xt_table_info *newinfo) |
2722971c | 1017 | { |
dcea992a | 1018 | const struct xt_entry_match *ematch; |
87a2e70d | 1019 | const struct xt_entry_target *t; |
e5b5ef7d | 1020 | unsigned int entry_offset; |
2722971c DM |
1021 | int off, i, ret; |
1022 | ||
30c08c41 | 1023 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c | 1024 | entry_offset = (void *)e - base; |
dcea992a | 1025 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1026 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1027 | t = ipt_get_target_c(e); |
9fa492cd | 1028 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1029 | newinfo->size -= off; |
b386d9f5 | 1030 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1031 | if (ret) |
1032 | return ret; | |
1033 | ||
6e23ae2a | 1034 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1035 | if (info->hook_entry[i] && |
1036 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1037 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1038 | if (info->underflow[i] && |
1039 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1040 | newinfo->underflow[i] -= off; |
1041 | } | |
1042 | return 0; | |
1043 | } | |
1044 | ||
259d4e41 | 1045 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1046 | struct xt_table_info *newinfo) |
2722971c | 1047 | { |
72b2b1dd | 1048 | struct ipt_entry *iter; |
2722971c | 1049 | void *loc_cpu_entry; |
0559518b | 1050 | int ret; |
2722971c DM |
1051 | |
1052 | if (!newinfo || !info) | |
1053 | return -EINVAL; | |
1054 | ||
259d4e41 ED |
1055 | /* we dont care about newinfo->entries[] */ |
1056 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1057 | newinfo->initial_entries = 0; | |
2722971c | 1058 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
255d0dc3 | 1059 | xt_compat_init_offsets(AF_INET, info->number); |
72b2b1dd JE |
1060 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1061 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1062 | if (ret != 0) | |
0559518b | 1063 | return ret; |
72b2b1dd | 1064 | } |
0559518b | 1065 | return 0; |
2722971c DM |
1066 | } |
1067 | #endif | |
1068 | ||
d5d1baa1 JE |
1069 | static int get_info(struct net *net, void __user *user, |
1070 | const int *len, int compat) | |
2722971c | 1071 | { |
12b00c2c | 1072 | char name[XT_TABLE_MAXNAMELEN]; |
e60a13e0 | 1073 | struct xt_table *t; |
2722971c DM |
1074 | int ret; |
1075 | ||
1076 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1077 | duprintf("length %u != %zu\n", *len, |
1078 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1079 | return -EINVAL; |
1080 | } | |
1081 | ||
1082 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1083 | return -EFAULT; | |
1084 | ||
12b00c2c | 1085 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
2722971c DM |
1086 | #ifdef CONFIG_COMPAT |
1087 | if (compat) | |
1088 | xt_compat_lock(AF_INET); | |
1089 | #endif | |
34bd137b | 1090 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1091 | "iptable_%s", name); |
0cc8d8df | 1092 | if (!IS_ERR_OR_NULL(t)) { |
2722971c | 1093 | struct ipt_getinfo info; |
5452e425 | 1094 | const struct xt_table_info *private = t->private; |
2722971c | 1095 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1096 | struct xt_table_info tmp; |
1097 | ||
2722971c | 1098 | if (compat) { |
2722971c | 1099 | ret = compat_table_info(private, &tmp); |
b386d9f5 | 1100 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1101 | private = &tmp; |
2722971c DM |
1102 | } |
1103 | #endif | |
b5f15ac4 | 1104 | memset(&info, 0, sizeof(info)); |
2722971c DM |
1105 | info.valid_hooks = t->valid_hooks; |
1106 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1107 | sizeof(info.hook_entry)); |
2722971c | 1108 | memcpy(info.underflow, private->underflow, |
4b478248 | 1109 | sizeof(info.underflow)); |
2722971c DM |
1110 | info.num_entries = private->number; |
1111 | info.size = private->size; | |
1112 | strcpy(info.name, name); | |
1113 | ||
1114 | if (copy_to_user(user, &info, *len) != 0) | |
1115 | ret = -EFAULT; | |
1116 | else | |
1117 | ret = 0; | |
1118 | ||
1119 | xt_table_unlock(t); | |
1120 | module_put(t->me); | |
1121 | } else | |
1122 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1123 | #ifdef CONFIG_COMPAT | |
1124 | if (compat) | |
1125 | xt_compat_unlock(AF_INET); | |
1126 | #endif | |
1127 | return ret; | |
1128 | } | |
1129 | ||
1130 | static int | |
d5d1baa1 JE |
1131 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
1132 | const int *len) | |
2722971c DM |
1133 | { |
1134 | int ret; | |
1135 | struct ipt_get_entries get; | |
e60a13e0 | 1136 | struct xt_table *t; |
2722971c DM |
1137 | |
1138 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1139 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1140 | return -EINVAL; |
1141 | } | |
1142 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1143 | return -EFAULT; | |
1144 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1145 | duprintf("get_entries: %u != %zu\n", |
1146 | *len, sizeof(get) + get.size); | |
2722971c DM |
1147 | return -EINVAL; |
1148 | } | |
1149 | ||
34bd137b | 1150 | t = xt_find_table_lock(net, AF_INET, get.name); |
0cc8d8df | 1151 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1152 | const struct xt_table_info *private = t->private; |
9c547959 | 1153 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1154 | if (get.size == private->size) |
1155 | ret = copy_entries_to_user(private->size, | |
1156 | t, uptr->entrytable); | |
1157 | else { | |
1158 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1159 | private->size, get.size); |
544473c1 | 1160 | ret = -EAGAIN; |
2722971c DM |
1161 | } |
1162 | module_put(t->me); | |
1163 | xt_table_unlock(t); | |
1164 | } else | |
1165 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1166 | ||
1167 | return ret; | |
1168 | } | |
1169 | ||
1170 | static int | |
34bd137b | 1171 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1172 | struct xt_table_info *newinfo, unsigned int num_counters, |
1173 | void __user *counters_ptr) | |
2722971c DM |
1174 | { |
1175 | int ret; | |
e60a13e0 | 1176 | struct xt_table *t; |
2722971c DM |
1177 | struct xt_table_info *oldinfo; |
1178 | struct xt_counters *counters; | |
1179 | void *loc_cpu_old_entry; | |
72b2b1dd | 1180 | struct ipt_entry *iter; |
2722971c DM |
1181 | |
1182 | ret = 0; | |
83723d60 | 1183 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
2722971c DM |
1184 | if (!counters) { |
1185 | ret = -ENOMEM; | |
1186 | goto out; | |
1187 | } | |
1188 | ||
34bd137b | 1189 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c | 1190 | "iptable_%s", name); |
0cc8d8df | 1191 | if (IS_ERR_OR_NULL(t)) { |
2722971c DM |
1192 | ret = t ? PTR_ERR(t) : -ENOENT; |
1193 | goto free_newinfo_counters_untrans; | |
1194 | } | |
1195 | ||
1196 | /* You lied! */ | |
1197 | if (valid_hooks != t->valid_hooks) { | |
1198 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1199 | valid_hooks, t->valid_hooks); | |
1200 | ret = -EINVAL; | |
1201 | goto put_module; | |
1202 | } | |
1203 | ||
1204 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1205 | if (!oldinfo) | |
1206 | goto put_module; | |
1207 | ||
1208 | /* Update module usage count based on number of rules */ | |
1209 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1210 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1211 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1212 | (newinfo->number <= oldinfo->initial_entries)) | |
1213 | module_put(t->me); | |
1214 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1215 | (newinfo->number <= oldinfo->initial_entries)) | |
1216 | module_put(t->me); | |
1217 | ||
942e4a2b | 1218 | /* Get the old counters, and synchronize with replace */ |
2722971c | 1219 | get_counters(oldinfo, counters); |
942e4a2b | 1220 | |
2722971c DM |
1221 | /* Decrease module usage counts and free resource */ |
1222 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
72b2b1dd | 1223 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1224 | cleanup_entry(iter, net); |
72b2b1dd | 1225 | |
2722971c DM |
1226 | xt_free_table_info(oldinfo); |
1227 | if (copy_to_user(counters_ptr, counters, | |
1228 | sizeof(struct xt_counters) * num_counters) != 0) | |
1229 | ret = -EFAULT; | |
1230 | vfree(counters); | |
1231 | xt_table_unlock(t); | |
1232 | return ret; | |
1233 | ||
1234 | put_module: | |
1235 | module_put(t->me); | |
1236 | xt_table_unlock(t); | |
1237 | free_newinfo_counters_untrans: | |
1238 | vfree(counters); | |
1239 | out: | |
1240 | return ret; | |
1241 | } | |
1242 | ||
1243 | static int | |
d5d1baa1 | 1244 | do_replace(struct net *net, const void __user *user, unsigned int len) |
2722971c DM |
1245 | { |
1246 | int ret; | |
1247 | struct ipt_replace tmp; | |
1248 | struct xt_table_info *newinfo; | |
1249 | void *loc_cpu_entry; | |
72b2b1dd | 1250 | struct ipt_entry *iter; |
2722971c DM |
1251 | |
1252 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1253 | return -EFAULT; | |
1254 | ||
2722971c | 1255 | /* overflow check */ |
2722971c DM |
1256 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1257 | return -ENOMEM; | |
78b79876 | 1258 | tmp.name[sizeof(tmp.name)-1] = 0; |
2722971c DM |
1259 | |
1260 | newinfo = xt_alloc_table_info(tmp.size); | |
1261 | if (!newinfo) | |
1262 | return -ENOMEM; | |
1263 | ||
9c547959 | 1264 | /* choose the copy that is on our node/cpu */ |
2722971c DM |
1265 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1266 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1267 | tmp.size) != 0) { | |
1268 | ret = -EFAULT; | |
1269 | goto free_newinfo; | |
1270 | } | |
1271 | ||
0f234214 | 1272 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
2722971c DM |
1273 | if (ret != 0) |
1274 | goto free_newinfo; | |
1275 | ||
ff67e4e4 | 1276 | duprintf("Translated table\n"); |
2722971c | 1277 | |
34bd137b | 1278 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1279 | tmp.num_counters, tmp.counters); |
2722971c DM |
1280 | if (ret) |
1281 | goto free_newinfo_untrans; | |
1282 | return 0; | |
1283 | ||
1284 | free_newinfo_untrans: | |
72b2b1dd | 1285 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1286 | cleanup_entry(iter, net); |
2722971c DM |
1287 | free_newinfo: |
1288 | xt_free_table_info(newinfo); | |
1289 | return ret; | |
1290 | } | |
1291 | ||
2722971c | 1292 | static int |
d5d1baa1 JE |
1293 | do_add_counters(struct net *net, const void __user *user, |
1294 | unsigned int len, int compat) | |
2722971c | 1295 | { |
942e4a2b | 1296 | unsigned int i, curcpu; |
2722971c DM |
1297 | struct xt_counters_info tmp; |
1298 | struct xt_counters *paddc; | |
1299 | unsigned int num_counters; | |
5452e425 | 1300 | const char *name; |
2722971c DM |
1301 | int size; |
1302 | void *ptmp; | |
e60a13e0 | 1303 | struct xt_table *t; |
5452e425 | 1304 | const struct xt_table_info *private; |
2722971c DM |
1305 | int ret = 0; |
1306 | void *loc_cpu_entry; | |
72b2b1dd | 1307 | struct ipt_entry *iter; |
7f5c6d4f | 1308 | unsigned int addend; |
2722971c DM |
1309 | #ifdef CONFIG_COMPAT |
1310 | struct compat_xt_counters_info compat_tmp; | |
1311 | ||
1312 | if (compat) { | |
1313 | ptmp = &compat_tmp; | |
1314 | size = sizeof(struct compat_xt_counters_info); | |
1315 | } else | |
1316 | #endif | |
1317 | { | |
1318 | ptmp = &tmp; | |
1319 | size = sizeof(struct xt_counters_info); | |
1320 | } | |
1321 | ||
1322 | if (copy_from_user(ptmp, user, size) != 0) | |
1323 | return -EFAULT; | |
1324 | ||
1325 | #ifdef CONFIG_COMPAT | |
1326 | if (compat) { | |
1327 | num_counters = compat_tmp.num_counters; | |
1328 | name = compat_tmp.name; | |
1329 | } else | |
1330 | #endif | |
1331 | { | |
1332 | num_counters = tmp.num_counters; | |
1333 | name = tmp.name; | |
1334 | } | |
1335 | ||
1336 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1337 | return -EINVAL; | |
1338 | ||
e12f8e29 | 1339 | paddc = vmalloc(len - size); |
2722971c DM |
1340 | if (!paddc) |
1341 | return -ENOMEM; | |
1342 | ||
1343 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1344 | ret = -EFAULT; | |
1345 | goto free; | |
1346 | } | |
1347 | ||
34bd137b | 1348 | t = xt_find_table_lock(net, AF_INET, name); |
0cc8d8df | 1349 | if (IS_ERR_OR_NULL(t)) { |
2722971c DM |
1350 | ret = t ? PTR_ERR(t) : -ENOENT; |
1351 | goto free; | |
1352 | } | |
1353 | ||
942e4a2b | 1354 | local_bh_disable(); |
2722971c DM |
1355 | private = t->private; |
1356 | if (private->number != num_counters) { | |
1357 | ret = -EINVAL; | |
1358 | goto unlock_up_free; | |
1359 | } | |
1360 | ||
1361 | i = 0; | |
1362 | /* Choose the copy that is on our node */ | |
942e4a2b SH |
1363 | curcpu = smp_processor_id(); |
1364 | loc_cpu_entry = private->entries[curcpu]; | |
7f5c6d4f | 1365 | addend = xt_write_recseq_begin(); |
0559518b JE |
1366 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1367 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1368 | ++i; | |
1369 | } | |
7f5c6d4f | 1370 | xt_write_recseq_end(addend); |
2722971c | 1371 | unlock_up_free: |
942e4a2b | 1372 | local_bh_enable(); |
2722971c DM |
1373 | xt_table_unlock(t); |
1374 | module_put(t->me); | |
1375 | free: | |
1376 | vfree(paddc); | |
1377 | ||
1378 | return ret; | |
1379 | } | |
1380 | ||
1381 | #ifdef CONFIG_COMPAT | |
1382 | struct compat_ipt_replace { | |
12b00c2c | 1383 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1384 | u32 valid_hooks; |
1385 | u32 num_entries; | |
1386 | u32 size; | |
6e23ae2a PM |
1387 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1388 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c | 1389 | u32 num_counters; |
87a2e70d | 1390 | compat_uptr_t counters; /* struct xt_counters * */ |
2722971c DM |
1391 | struct compat_ipt_entry entries[0]; |
1392 | }; | |
1393 | ||
a18aa31b PM |
1394 | static int |
1395 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1396 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1397 | unsigned int i) |
2722971c | 1398 | { |
87a2e70d | 1399 | struct xt_entry_target *t; |
2722971c DM |
1400 | struct compat_ipt_entry __user *ce; |
1401 | u_int16_t target_offset, next_offset; | |
1402 | compat_uint_t origsize; | |
dcea992a JE |
1403 | const struct xt_entry_match *ematch; |
1404 | int ret = 0; | |
2722971c | 1405 | |
2722971c DM |
1406 | origsize = *size; |
1407 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
0559518b JE |
1408 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
1409 | copy_to_user(&ce->counters, &counters[i], | |
1410 | sizeof(counters[i])) != 0) | |
1411 | return -EFAULT; | |
a18aa31b | 1412 | |
2722971c | 1413 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1414 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1415 | ||
dcea992a JE |
1416 | xt_ematch_foreach(ematch, e) { |
1417 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1418 | if (ret != 0) | |
6bdb331b | 1419 | return ret; |
dcea992a | 1420 | } |
2722971c | 1421 | target_offset = e->target_offset - (origsize - *size); |
2722971c | 1422 | t = ipt_get_target(e); |
9fa492cd | 1423 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c | 1424 | if (ret) |
0559518b | 1425 | return ret; |
2722971c | 1426 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1427 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1428 | put_user(next_offset, &ce->next_offset) != 0) | |
1429 | return -EFAULT; | |
2722971c | 1430 | return 0; |
2722971c DM |
1431 | } |
1432 | ||
022748a9 | 1433 | static int |
87a2e70d | 1434 | compat_find_calc_match(struct xt_entry_match *m, |
4b478248 PM |
1435 | const char *name, |
1436 | const struct ipt_ip *ip, | |
1437 | unsigned int hookmask, | |
6bdb331b | 1438 | int *size) |
2722971c | 1439 | { |
6709dbbb | 1440 | struct xt_match *match; |
2722971c | 1441 | |
fd0ec0e6 JE |
1442 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
1443 | m->u.user.revision); | |
1444 | if (IS_ERR(match)) { | |
2722971c | 1445 | duprintf("compat_check_calc_match: `%s' not found\n", |
4b478248 | 1446 | m->u.user.name); |
fd0ec0e6 | 1447 | return PTR_ERR(match); |
2722971c DM |
1448 | } |
1449 | m->u.kernel.match = match; | |
9fa492cd | 1450 | *size += xt_compat_match_offset(match); |
4c1b52bc DM |
1451 | return 0; |
1452 | } | |
1453 | ||
0559518b | 1454 | static void compat_release_entry(struct compat_ipt_entry *e) |
4c1b52bc | 1455 | { |
87a2e70d | 1456 | struct xt_entry_target *t; |
dcea992a | 1457 | struct xt_entry_match *ematch; |
4c1b52bc | 1458 | |
4c1b52bc | 1459 | /* Cleanup all matches */ |
dcea992a | 1460 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1461 | module_put(ematch->u.kernel.match->me); |
73cd598d | 1462 | t = compat_ipt_get_target(e); |
4c1b52bc | 1463 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1464 | } |
1465 | ||
022748a9 | 1466 | static int |
73cd598d | 1467 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1468 | struct xt_table_info *newinfo, |
1469 | unsigned int *size, | |
d5d1baa1 JE |
1470 | const unsigned char *base, |
1471 | const unsigned char *limit, | |
1472 | const unsigned int *hook_entries, | |
1473 | const unsigned int *underflows, | |
4b478248 | 1474 | const char *name) |
2722971c | 1475 | { |
dcea992a | 1476 | struct xt_entry_match *ematch; |
87a2e70d | 1477 | struct xt_entry_target *t; |
6709dbbb | 1478 | struct xt_target *target; |
e5b5ef7d | 1479 | unsigned int entry_offset; |
b0a6363c PM |
1480 | unsigned int j; |
1481 | int ret, off, h; | |
2722971c DM |
1482 | |
1483 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1484 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
1485 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { | |
2722971c DM |
1486 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1487 | return -EINVAL; | |
1488 | } | |
1489 | ||
1490 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1491 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1492 | duprintf("checking: element %p size %u\n", |
1493 | e, e->next_offset); | |
1494 | return -EINVAL; | |
1495 | } | |
1496 | ||
73cd598d PM |
1497 | /* For purposes of check_entry casting the compat entry is fine */ |
1498 | ret = check_entry((struct ipt_entry *)e, name); | |
a96be246 DM |
1499 | if (ret) |
1500 | return ret; | |
590bdf7f | 1501 | |
30c08c41 | 1502 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1503 | entry_offset = (void *)e - (void *)base; |
1504 | j = 0; | |
dcea992a JE |
1505 | xt_ematch_foreach(ematch, e) { |
1506 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1507 | &e->ip, e->comefrom, &off); |
dcea992a | 1508 | if (ret != 0) |
6bdb331b JE |
1509 | goto release_matches; |
1510 | ++j; | |
dcea992a | 1511 | } |
2722971c | 1512 | |
73cd598d | 1513 | t = compat_ipt_get_target(e); |
d2a7b6ba JE |
1514 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
1515 | t->u.user.revision); | |
1516 | if (IS_ERR(target)) { | |
a96be246 | 1517 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1518 | t->u.user.name); |
d2a7b6ba | 1519 | ret = PTR_ERR(target); |
4c1b52bc | 1520 | goto release_matches; |
2722971c DM |
1521 | } |
1522 | t->u.kernel.target = target; | |
1523 | ||
9fa492cd | 1524 | off += xt_compat_target_offset(target); |
2722971c | 1525 | *size += off; |
b386d9f5 | 1526 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1527 | if (ret) |
1528 | goto out; | |
1529 | ||
1530 | /* Check hooks & underflows */ | |
6e23ae2a | 1531 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1532 | if ((unsigned char *)e - base == hook_entries[h]) |
1533 | newinfo->hook_entry[h] = hook_entries[h]; | |
1534 | if ((unsigned char *)e - base == underflows[h]) | |
1535 | newinfo->underflow[h] = underflows[h]; | |
1536 | } | |
1537 | ||
1538 | /* Clear counters and comefrom */ | |
73cd598d | 1539 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c | 1540 | e->comefrom = 0; |
2722971c | 1541 | return 0; |
bec71b16 | 1542 | |
2722971c | 1543 | out: |
bec71b16 | 1544 | module_put(t->u.kernel.target->me); |
4c1b52bc | 1545 | release_matches: |
6bdb331b JE |
1546 | xt_ematch_foreach(ematch, e) { |
1547 | if (j-- == 0) | |
dcea992a | 1548 | break; |
6bdb331b JE |
1549 | module_put(ematch->u.kernel.match->me); |
1550 | } | |
2722971c DM |
1551 | return ret; |
1552 | } | |
1553 | ||
4b478248 | 1554 | static int |
73cd598d | 1555 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1556 | unsigned int *size, const char *name, |
1557 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c | 1558 | { |
87a2e70d | 1559 | struct xt_entry_target *t; |
6709dbbb | 1560 | struct xt_target *target; |
2722971c DM |
1561 | struct ipt_entry *de; |
1562 | unsigned int origsize; | |
920b868a | 1563 | int ret, h; |
dcea992a | 1564 | struct xt_entry_match *ematch; |
2722971c DM |
1565 | |
1566 | ret = 0; | |
1567 | origsize = *size; | |
1568 | de = (struct ipt_entry *)*dstptr; | |
1569 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1570 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1571 | |
73cd598d | 1572 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1573 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1574 | ||
dcea992a JE |
1575 | xt_ematch_foreach(ematch, e) { |
1576 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1577 | if (ret != 0) | |
6bdb331b | 1578 | return ret; |
dcea992a | 1579 | } |
2722971c | 1580 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1581 | t = compat_ipt_get_target(e); |
2722971c | 1582 | target = t->u.kernel.target; |
9fa492cd | 1583 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1584 | |
1585 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1586 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1587 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1588 | newinfo->hook_entry[h] -= origsize - *size; | |
1589 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1590 | newinfo->underflow[h] -= origsize - *size; | |
1591 | } | |
f6677f43 DM |
1592 | return ret; |
1593 | } | |
1594 | ||
022748a9 | 1595 | static int |
0559518b | 1596 | compat_check_entry(struct ipt_entry *e, struct net *net, const char *name) |
f6677f43 | 1597 | { |
dcea992a | 1598 | struct xt_entry_match *ematch; |
9b4fce7a | 1599 | struct xt_mtchk_param mtpar; |
b0a6363c | 1600 | unsigned int j; |
dcea992a | 1601 | int ret = 0; |
f6677f43 | 1602 | |
4c1b52bc | 1603 | j = 0; |
a83d8e8d | 1604 | mtpar.net = net; |
9b4fce7a JE |
1605 | mtpar.table = name; |
1606 | mtpar.entryinfo = &e->ip; | |
1607 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1608 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 1609 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1610 | ret = check_match(ematch, &mtpar); |
dcea992a | 1611 | if (ret != 0) |
6bdb331b JE |
1612 | goto cleanup_matches; |
1613 | ++j; | |
dcea992a | 1614 | } |
4c1b52bc | 1615 | |
add67461 | 1616 | ret = check_target(e, net, name); |
4c1b52bc DM |
1617 | if (ret) |
1618 | goto cleanup_matches; | |
4c1b52bc DM |
1619 | return 0; |
1620 | ||
1621 | cleanup_matches: | |
6bdb331b JE |
1622 | xt_ematch_foreach(ematch, e) { |
1623 | if (j-- == 0) | |
dcea992a | 1624 | break; |
6bdb331b JE |
1625 | cleanup_match(ematch, net); |
1626 | } | |
4c1b52bc | 1627 | return ret; |
f6677f43 DM |
1628 | } |
1629 | ||
1da177e4 | 1630 | static int |
a83d8e8d AD |
1631 | translate_compat_table(struct net *net, |
1632 | const char *name, | |
4b478248 PM |
1633 | unsigned int valid_hooks, |
1634 | struct xt_table_info **pinfo, | |
1635 | void **pentry0, | |
1636 | unsigned int total_size, | |
1637 | unsigned int number, | |
1638 | unsigned int *hook_entries, | |
1639 | unsigned int *underflows) | |
1da177e4 | 1640 | { |
920b868a | 1641 | unsigned int i, j; |
2722971c DM |
1642 | struct xt_table_info *newinfo, *info; |
1643 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1644 | struct compat_ipt_entry *iter0; |
1645 | struct ipt_entry *iter1; | |
2722971c | 1646 | unsigned int size; |
0559518b | 1647 | int ret; |
1da177e4 | 1648 | |
2722971c DM |
1649 | info = *pinfo; |
1650 | entry0 = *pentry0; | |
1651 | size = total_size; | |
1652 | info->number = number; | |
1653 | ||
1654 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1655 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1656 | info->hook_entry[i] = 0xFFFFFFFF; |
1657 | info->underflow[i] = 0xFFFFFFFF; | |
1658 | } | |
1659 | ||
1660 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1661 | j = 0; |
2722971c | 1662 | xt_compat_lock(AF_INET); |
255d0dc3 | 1663 | xt_compat_init_offsets(AF_INET, number); |
2722971c | 1664 | /* Walk through entries, checking offsets. */ |
72b2b1dd JE |
1665 | xt_entry_foreach(iter0, entry0, total_size) { |
1666 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1667 | entry0, |
1668 | entry0 + total_size, | |
1669 | hook_entries, | |
1670 | underflows, | |
1671 | name); | |
72b2b1dd | 1672 | if (ret != 0) |
0559518b JE |
1673 | goto out_unlock; |
1674 | ++j; | |
72b2b1dd | 1675 | } |
2722971c DM |
1676 | |
1677 | ret = -EINVAL; | |
920b868a | 1678 | if (j != number) { |
2722971c | 1679 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1680 | j, number); |
2722971c DM |
1681 | goto out_unlock; |
1682 | } | |
1683 | ||
1684 | /* Check hooks all assigned */ | |
6e23ae2a | 1685 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1686 | /* Only hooks which are valid */ |
1687 | if (!(valid_hooks & (1 << i))) | |
1688 | continue; | |
1689 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1690 | duprintf("Invalid hook entry %u %u\n", | |
1691 | i, hook_entries[i]); | |
1692 | goto out_unlock; | |
1da177e4 | 1693 | } |
2722971c DM |
1694 | if (info->underflow[i] == 0xFFFFFFFF) { |
1695 | duprintf("Invalid underflow %u %u\n", | |
1696 | i, underflows[i]); | |
1697 | goto out_unlock; | |
1698 | } | |
1699 | } | |
1700 | ||
1701 | ret = -ENOMEM; | |
1702 | newinfo = xt_alloc_table_info(size); | |
1703 | if (!newinfo) | |
1704 | goto out_unlock; | |
1705 | ||
1706 | newinfo->number = number; | |
6e23ae2a | 1707 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1708 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1709 | newinfo->underflow[i] = info->underflow[i]; | |
1710 | } | |
1711 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1712 | pos = entry1; | |
4b478248 | 1713 | size = total_size; |
72b2b1dd | 1714 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1715 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1716 | name, newinfo, entry1); | |
72b2b1dd JE |
1717 | if (ret != 0) |
1718 | break; | |
1719 | } | |
b386d9f5 | 1720 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1721 | xt_compat_unlock(AF_INET); |
1722 | if (ret) | |
1723 | goto free_newinfo; | |
1724 | ||
1725 | ret = -ELOOP; | |
1726 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1727 | goto free_newinfo; | |
1728 | ||
4c1b52bc | 1729 | i = 0; |
72b2b1dd | 1730 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1731 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1732 | if (ret != 0) |
1733 | break; | |
0559518b | 1734 | ++i; |
cca77b7c FW |
1735 | if (strcmp(ipt_get_target(iter1)->u.user.name, |
1736 | XT_ERROR_TARGET) == 0) | |
1737 | ++newinfo->stacksize; | |
72b2b1dd | 1738 | } |
4c1b52bc | 1739 | if (ret) { |
72b2b1dd JE |
1740 | /* |
1741 | * The first i matches need cleanup_entry (calls ->destroy) | |
1742 | * because they had called ->check already. The other j-i | |
1743 | * entries need only release. | |
1744 | */ | |
1745 | int skip = i; | |
4c1b52bc | 1746 | j -= i; |
72b2b1dd JE |
1747 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1748 | if (skip-- > 0) | |
1749 | continue; | |
0559518b | 1750 | if (j-- == 0) |
72b2b1dd | 1751 | break; |
0559518b | 1752 | compat_release_entry(iter0); |
72b2b1dd | 1753 | } |
0559518b JE |
1754 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1755 | if (i-- == 0) | |
72b2b1dd | 1756 | break; |
0559518b JE |
1757 | cleanup_entry(iter1, net); |
1758 | } | |
4c1b52bc DM |
1759 | xt_free_table_info(newinfo); |
1760 | return ret; | |
1761 | } | |
f6677f43 | 1762 | |
2722971c | 1763 | /* And one copy for every other CPU */ |
fb1bb34d | 1764 | for_each_possible_cpu(i) |
2722971c DM |
1765 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1766 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1767 | ||
1768 | *pinfo = newinfo; | |
1769 | *pentry0 = entry1; | |
1770 | xt_free_table_info(info); | |
1771 | return 0; | |
1da177e4 | 1772 | |
2722971c DM |
1773 | free_newinfo: |
1774 | xt_free_table_info(newinfo); | |
1775 | out: | |
0559518b JE |
1776 | xt_entry_foreach(iter0, entry0, total_size) { |
1777 | if (j-- == 0) | |
72b2b1dd | 1778 | break; |
0559518b JE |
1779 | compat_release_entry(iter0); |
1780 | } | |
1da177e4 | 1781 | return ret; |
2722971c | 1782 | out_unlock: |
b386d9f5 | 1783 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1784 | xt_compat_unlock(AF_INET); |
1785 | goto out; | |
1da177e4 LT |
1786 | } |
1787 | ||
1788 | static int | |
34bd137b | 1789 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1790 | { |
1791 | int ret; | |
2722971c DM |
1792 | struct compat_ipt_replace tmp; |
1793 | struct xt_table_info *newinfo; | |
1794 | void *loc_cpu_entry; | |
72b2b1dd | 1795 | struct ipt_entry *iter; |
1da177e4 LT |
1796 | |
1797 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1798 | return -EFAULT; | |
1799 | ||
ee4bb818 | 1800 | /* overflow check */ |
259d4e41 | 1801 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1802 | return -ENOMEM; |
1803 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1804 | return -ENOMEM; | |
78b79876 | 1805 | tmp.name[sizeof(tmp.name)-1] = 0; |
ee4bb818 | 1806 | |
2e4e6a17 | 1807 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1808 | if (!newinfo) |
1809 | return -ENOMEM; | |
1810 | ||
9c547959 | 1811 | /* choose the copy that is on our node/cpu */ |
31836064 ED |
1812 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1813 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1814 | tmp.size) != 0) { |
1815 | ret = -EFAULT; | |
1816 | goto free_newinfo; | |
1817 | } | |
1818 | ||
a83d8e8d | 1819 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
4b478248 PM |
1820 | &newinfo, &loc_cpu_entry, tmp.size, |
1821 | tmp.num_entries, tmp.hook_entry, | |
1822 | tmp.underflow); | |
2722971c | 1823 | if (ret != 0) |
1da177e4 | 1824 | goto free_newinfo; |
1da177e4 | 1825 | |
2722971c | 1826 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1827 | |
34bd137b | 1828 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1829 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1830 | if (ret) |
1831 | goto free_newinfo_untrans; | |
1832 | return 0; | |
1da177e4 | 1833 | |
2722971c | 1834 | free_newinfo_untrans: |
72b2b1dd | 1835 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1836 | cleanup_entry(iter, net); |
2722971c DM |
1837 | free_newinfo: |
1838 | xt_free_table_info(newinfo); | |
1839 | return ret; | |
1840 | } | |
1da177e4 | 1841 | |
2722971c DM |
1842 | static int |
1843 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1844 | unsigned int len) |
2722971c DM |
1845 | { |
1846 | int ret; | |
1da177e4 | 1847 | |
52e804c6 | 1848 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
2722971c | 1849 | return -EPERM; |
1da177e4 | 1850 | |
2722971c DM |
1851 | switch (cmd) { |
1852 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1853 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1854 | break; |
1da177e4 | 1855 | |
2722971c | 1856 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1857 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1858 | break; |
1859 | ||
1860 | default: | |
1861 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1862 | ret = -EINVAL; | |
1863 | } | |
1da177e4 | 1864 | |
1da177e4 LT |
1865 | return ret; |
1866 | } | |
1867 | ||
4b478248 | 1868 | struct compat_ipt_get_entries { |
12b00c2c | 1869 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1870 | compat_uint_t size; |
1871 | struct compat_ipt_entry entrytable[0]; | |
1872 | }; | |
1da177e4 | 1873 | |
4b478248 PM |
1874 | static int |
1875 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1876 | void __user *userptr) | |
2722971c | 1877 | { |
2722971c | 1878 | struct xt_counters *counters; |
5452e425 | 1879 | const struct xt_table_info *private = table->private; |
2722971c DM |
1880 | void __user *pos; |
1881 | unsigned int size; | |
1882 | int ret = 0; | |
5452e425 | 1883 | const void *loc_cpu_entry; |
a18aa31b | 1884 | unsigned int i = 0; |
72b2b1dd | 1885 | struct ipt_entry *iter; |
1da177e4 | 1886 | |
2722971c DM |
1887 | counters = alloc_counters(table); |
1888 | if (IS_ERR(counters)) | |
1889 | return PTR_ERR(counters); | |
1890 | ||
1891 | /* choose the copy that is on our node/cpu, ... | |
1892 | * This choice is lazy (because current thread is | |
1893 | * allowed to migrate to another cpu) | |
1894 | */ | |
1895 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1896 | pos = userptr; | |
1897 | size = total_size; | |
72b2b1dd JE |
1898 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1899 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1900 | &size, counters, i++); |
72b2b1dd JE |
1901 | if (ret != 0) |
1902 | break; | |
1903 | } | |
2722971c | 1904 | |
2722971c DM |
1905 | vfree(counters); |
1906 | return ret; | |
1da177e4 LT |
1907 | } |
1908 | ||
1909 | static int | |
34bd137b AD |
1910 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1911 | int *len) | |
1da177e4 | 1912 | { |
2722971c DM |
1913 | int ret; |
1914 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1915 | struct xt_table *t; |
1da177e4 | 1916 | |
2722971c | 1917 | if (*len < sizeof(get)) { |
c9d8fe13 | 1918 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1919 | return -EINVAL; |
2722971c | 1920 | } |
1da177e4 | 1921 | |
2722971c DM |
1922 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1923 | return -EFAULT; | |
1da177e4 | 1924 | |
2722971c | 1925 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1926 | duprintf("compat_get_entries: %u != %zu\n", |
1927 | *len, sizeof(get) + get.size); | |
2722971c | 1928 | return -EINVAL; |
1da177e4 LT |
1929 | } |
1930 | ||
2722971c | 1931 | xt_compat_lock(AF_INET); |
34bd137b | 1932 | t = xt_find_table_lock(net, AF_INET, get.name); |
0cc8d8df | 1933 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1934 | const struct xt_table_info *private = t->private; |
2722971c | 1935 | struct xt_table_info info; |
9c547959 | 1936 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1937 | ret = compat_table_info(private, &info); |
1938 | if (!ret && get.size == info.size) { | |
1939 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 1940 | t, uptr->entrytable); |
2722971c DM |
1941 | } else if (!ret) { |
1942 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1943 | private->size, get.size); |
544473c1 | 1944 | ret = -EAGAIN; |
2722971c | 1945 | } |
b386d9f5 | 1946 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1947 | module_put(t->me); |
1948 | xt_table_unlock(t); | |
1949 | } else | |
1da177e4 | 1950 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1951 | |
2722971c DM |
1952 | xt_compat_unlock(AF_INET); |
1953 | return ret; | |
1954 | } | |
1da177e4 | 1955 | |
79030ed0 PM |
1956 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1957 | ||
2722971c DM |
1958 | static int |
1959 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1960 | { | |
1961 | int ret; | |
1da177e4 | 1962 | |
52e804c6 | 1963 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
82fac054 BS |
1964 | return -EPERM; |
1965 | ||
2722971c DM |
1966 | switch (cmd) { |
1967 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1968 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1969 | break; |
1970 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1971 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1972 | break; |
1973 | default: | |
79030ed0 | 1974 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1975 | } |
1da177e4 LT |
1976 | return ret; |
1977 | } | |
2722971c | 1978 | #endif |
1da177e4 LT |
1979 | |
1980 | static int | |
9c547959 | 1981 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
1982 | { |
1983 | int ret; | |
1984 | ||
52e804c6 | 1985 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1986 | return -EPERM; |
1987 | ||
1988 | switch (cmd) { | |
1989 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1990 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1991 | break; |
1992 | ||
1993 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1994 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
1995 | break; |
1996 | ||
1997 | default: | |
1998 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1999 | ret = -EINVAL; | |
2000 | } | |
2001 | ||
2002 | return ret; | |
2003 | } | |
2004 | ||
2005 | static int | |
2006 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2007 | { | |
2008 | int ret; | |
2009 | ||
52e804c6 | 2010 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2011 | return -EPERM; |
2012 | ||
2013 | switch (cmd) { | |
2722971c | 2014 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2015 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2016 | break; |
1da177e4 | 2017 | |
2722971c | 2018 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2019 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2020 | break; |
1da177e4 LT |
2021 | |
2022 | case IPT_SO_GET_REVISION_MATCH: | |
2023 | case IPT_SO_GET_REVISION_TARGET: { | |
12b00c2c | 2024 | struct xt_get_revision rev; |
2e4e6a17 | 2025 | int target; |
1da177e4 LT |
2026 | |
2027 | if (*len != sizeof(rev)) { | |
2028 | ret = -EINVAL; | |
2029 | break; | |
2030 | } | |
2031 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2032 | ret = -EFAULT; | |
2033 | break; | |
2034 | } | |
78b79876 | 2035 | rev.name[sizeof(rev.name)-1] = 0; |
1da177e4 LT |
2036 | |
2037 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2038 | target = 1; |
1da177e4 | 2039 | else |
2e4e6a17 | 2040 | target = 0; |
1da177e4 | 2041 | |
2e4e6a17 HW |
2042 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2043 | rev.revision, | |
2044 | target, &ret), | |
1da177e4 LT |
2045 | "ipt_%s", rev.name); |
2046 | break; | |
2047 | } | |
2048 | ||
2049 | default: | |
2050 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2051 | ret = -EINVAL; | |
2052 | } | |
2053 | ||
2054 | return ret; | |
2055 | } | |
2056 | ||
35aad0ff JE |
2057 | struct xt_table *ipt_register_table(struct net *net, |
2058 | const struct xt_table *table, | |
44d34e72 | 2059 | const struct ipt_replace *repl) |
1da177e4 LT |
2060 | { |
2061 | int ret; | |
2e4e6a17 | 2062 | struct xt_table_info *newinfo; |
f3c5c1bf | 2063 | struct xt_table_info bootstrap = {0}; |
31836064 | 2064 | void *loc_cpu_entry; |
a98da11d | 2065 | struct xt_table *new_table; |
1da177e4 | 2066 | |
2e4e6a17 | 2067 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2068 | if (!newinfo) { |
2069 | ret = -ENOMEM; | |
2070 | goto out; | |
2071 | } | |
1da177e4 | 2072 | |
9c547959 | 2073 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2074 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2075 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2076 | |
0f234214 | 2077 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2078 | if (ret != 0) |
2079 | goto out_free; | |
1da177e4 | 2080 | |
44d34e72 | 2081 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2082 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2083 | ret = PTR_ERR(new_table); |
2084 | goto out_free; | |
1da177e4 LT |
2085 | } |
2086 | ||
44d34e72 AD |
2087 | return new_table; |
2088 | ||
2089 | out_free: | |
2090 | xt_free_table_info(newinfo); | |
2091 | out: | |
2092 | return ERR_PTR(ret); | |
1da177e4 LT |
2093 | } |
2094 | ||
f54e9367 | 2095 | void ipt_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2096 | { |
2e4e6a17 | 2097 | struct xt_table_info *private; |
31836064 | 2098 | void *loc_cpu_entry; |
df200969 | 2099 | struct module *table_owner = table->me; |
72b2b1dd | 2100 | struct ipt_entry *iter; |
31836064 | 2101 | |
e905a9ed | 2102 | private = xt_unregister_table(table); |
1da177e4 LT |
2103 | |
2104 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2105 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2106 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2107 | cleanup_entry(iter, net); |
df200969 AD |
2108 | if (private->number > private->initial_entries) |
2109 | module_put(table_owner); | |
2e4e6a17 | 2110 | xt_free_table_info(private); |
1da177e4 LT |
2111 | } |
2112 | ||
2113 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2114 | static inline bool |
1da177e4 LT |
2115 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2116 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2117 | bool invert) |
1da177e4 | 2118 | { |
9c547959 PM |
2119 | return ((test_type == 0xFF) || |
2120 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2121 | ^ invert; |
2122 | } | |
2123 | ||
1d93a9cb | 2124 | static bool |
62fc8051 | 2125 | icmp_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2126 | { |
5452e425 JE |
2127 | const struct icmphdr *ic; |
2128 | struct icmphdr _icmph; | |
f7108a20 | 2129 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2130 | |
2131 | /* Must not be a fragment. */ | |
f7108a20 | 2132 | if (par->fragoff != 0) |
1d93a9cb | 2133 | return false; |
1da177e4 | 2134 | |
f7108a20 | 2135 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2136 | if (ic == NULL) { |
2137 | /* We've been asked to examine this packet, and we | |
2138 | * can't. Hence, no choice but to drop. | |
2139 | */ | |
2140 | duprintf("Dropping evil ICMP tinygram.\n"); | |
b4ba2611 | 2141 | par->hotdrop = true; |
1d93a9cb | 2142 | return false; |
1da177e4 LT |
2143 | } |
2144 | ||
2145 | return icmp_type_code_match(icmpinfo->type, | |
2146 | icmpinfo->code[0], | |
2147 | icmpinfo->code[1], | |
2148 | ic->type, ic->code, | |
2149 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2150 | } | |
2151 | ||
b0f38452 | 2152 | static int icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2153 | { |
9b4fce7a | 2154 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2155 | |
1d5cd909 | 2156 | /* Must specify no unknown invflags */ |
bd414ee6 | 2157 | return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2158 | } |
2159 | ||
4538506b JE |
2160 | static struct xt_target ipt_builtin_tg[] __read_mostly = { |
2161 | { | |
243bf6e2 | 2162 | .name = XT_STANDARD_TARGET, |
4538506b JE |
2163 | .targetsize = sizeof(int), |
2164 | .family = NFPROTO_IPV4, | |
2722971c | 2165 | #ifdef CONFIG_COMPAT |
4538506b JE |
2166 | .compatsize = sizeof(compat_int_t), |
2167 | .compat_from_user = compat_standard_from_user, | |
2168 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2169 | #endif |
4538506b JE |
2170 | }, |
2171 | { | |
243bf6e2 | 2172 | .name = XT_ERROR_TARGET, |
4538506b | 2173 | .target = ipt_error, |
12b00c2c | 2174 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
2175 | .family = NFPROTO_IPV4, |
2176 | }, | |
1da177e4 LT |
2177 | }; |
2178 | ||
2179 | static struct nf_sockopt_ops ipt_sockopts = { | |
2180 | .pf = PF_INET, | |
2181 | .set_optmin = IPT_BASE_CTL, | |
2182 | .set_optmax = IPT_SO_SET_MAX+1, | |
2183 | .set = do_ipt_set_ctl, | |
2722971c DM |
2184 | #ifdef CONFIG_COMPAT |
2185 | .compat_set = compat_do_ipt_set_ctl, | |
2186 | #endif | |
1da177e4 LT |
2187 | .get_optmin = IPT_BASE_CTL, |
2188 | .get_optmax = IPT_SO_GET_MAX+1, | |
2189 | .get = do_ipt_get_ctl, | |
2722971c DM |
2190 | #ifdef CONFIG_COMPAT |
2191 | .compat_get = compat_do_ipt_get_ctl, | |
2192 | #endif | |
16fcec35 | 2193 | .owner = THIS_MODULE, |
1da177e4 LT |
2194 | }; |
2195 | ||
4538506b JE |
2196 | static struct xt_match ipt_builtin_mt[] __read_mostly = { |
2197 | { | |
2198 | .name = "icmp", | |
2199 | .match = icmp_match, | |
2200 | .matchsize = sizeof(struct ipt_icmp), | |
2201 | .checkentry = icmp_checkentry, | |
2202 | .proto = IPPROTO_ICMP, | |
2203 | .family = NFPROTO_IPV4, | |
2204 | }, | |
1da177e4 LT |
2205 | }; |
2206 | ||
3cb609d5 AD |
2207 | static int __net_init ip_tables_net_init(struct net *net) |
2208 | { | |
383ca5b8 | 2209 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
2210 | } |
2211 | ||
2212 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2213 | { | |
383ca5b8 | 2214 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
2215 | } |
2216 | ||
2217 | static struct pernet_operations ip_tables_net_ops = { | |
2218 | .init = ip_tables_net_init, | |
2219 | .exit = ip_tables_net_exit, | |
2220 | }; | |
2221 | ||
65b4b4e8 | 2222 | static int __init ip_tables_init(void) |
1da177e4 LT |
2223 | { |
2224 | int ret; | |
2225 | ||
3cb609d5 | 2226 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2227 | if (ret < 0) |
2228 | goto err1; | |
2e4e6a17 | 2229 | |
25985edc | 2230 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 2231 | ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 PM |
2232 | if (ret < 0) |
2233 | goto err2; | |
4538506b | 2234 | ret = xt_register_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 PM |
2235 | if (ret < 0) |
2236 | goto err4; | |
1da177e4 LT |
2237 | |
2238 | /* Register setsockopt */ | |
2239 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2240 | if (ret < 0) |
2241 | goto err5; | |
1da177e4 | 2242 | |
ff67e4e4 | 2243 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2244 | return 0; |
0eff66e6 PM |
2245 | |
2246 | err5: | |
4538506b | 2247 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 | 2248 | err4: |
4538506b | 2249 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 | 2250 | err2: |
3cb609d5 | 2251 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2252 | err1: |
2253 | return ret; | |
1da177e4 LT |
2254 | } |
2255 | ||
65b4b4e8 | 2256 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2257 | { |
2258 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2259 | |
4538506b JE |
2260 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
2261 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); | |
3cb609d5 | 2262 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2263 | } |
2264 | ||
2265 | EXPORT_SYMBOL(ipt_register_table); | |
2266 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2267 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2268 | module_init(ip_tables_init); |
2269 | module_exit(ip_tables_fini); |