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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 LT |
71 | /* |
72 | We keep a set of rules for each CPU, so we can avoid write-locking | |
73 | them in the softirq when updating the counters and therefore | |
74 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
75 | context stops packets coming through and allows user context to read | |
76 | the counters or update the rules. | |
77 | ||
1da177e4 LT |
78 | Hence the start of any table is given by get_table() below. */ |
79 | ||
1da177e4 | 80 | /* Returns whether matches rule or not. */ |
022748a9 | 81 | /* Performance critical - called for every packet */ |
9c547959 | 82 | static inline bool |
1da177e4 LT |
83 | ip_packet_match(const struct iphdr *ip, |
84 | const char *indev, | |
85 | const char *outdev, | |
86 | const struct ipt_ip *ipinfo, | |
87 | int isfrag) | |
88 | { | |
1da177e4 LT |
89 | unsigned long ret; |
90 | ||
e79ec50b | 91 | #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) |
1da177e4 LT |
92 | |
93 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, | |
3666ed1c JP |
94 | IPT_INV_SRCIP) || |
95 | FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, | |
96 | IPT_INV_DSTIP)) { | |
1da177e4 LT |
97 | dprintf("Source or dest mismatch.\n"); |
98 | ||
cffee385 HH |
99 | dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n", |
100 | &ip->saddr, &ipinfo->smsk.s_addr, &ipinfo->src.s_addr, | |
1da177e4 | 101 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); |
cffee385 HH |
102 | dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n", |
103 | &ip->daddr, &ipinfo->dmsk.s_addr, &ipinfo->dst.s_addr, | |
1da177e4 | 104 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); |
9c547959 | 105 | return false; |
1da177e4 LT |
106 | } |
107 | ||
b8dfe498 | 108 | ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask); |
1da177e4 LT |
109 | |
110 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { | |
111 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
112 | indev, ipinfo->iniface, | |
113 | ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":""); | |
9c547959 | 114 | return false; |
1da177e4 LT |
115 | } |
116 | ||
b8dfe498 | 117 | ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
1da177e4 LT |
118 | |
119 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { | |
120 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
121 | outdev, ipinfo->outiface, | |
122 | ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":""); | |
9c547959 | 123 | return false; |
1da177e4 LT |
124 | } |
125 | ||
126 | /* Check specific protocol */ | |
3666ed1c JP |
127 | if (ipinfo->proto && |
128 | FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { | |
1da177e4 LT |
129 | dprintf("Packet protocol %hi does not match %hi.%s\n", |
130 | ip->protocol, ipinfo->proto, | |
131 | ipinfo->invflags&IPT_INV_PROTO ? " (INV)":""); | |
9c547959 | 132 | return false; |
1da177e4 LT |
133 | } |
134 | ||
135 | /* If we have a fragment rule but the packet is not a fragment | |
136 | * then we return zero */ | |
137 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { | |
138 | dprintf("Fragment rule but not fragment.%s\n", | |
139 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); | |
9c547959 | 140 | return false; |
1da177e4 LT |
141 | } |
142 | ||
9c547959 | 143 | return true; |
1da177e4 LT |
144 | } |
145 | ||
022748a9 | 146 | static bool |
1da177e4 LT |
147 | ip_checkentry(const struct ipt_ip *ip) |
148 | { | |
149 | if (ip->flags & ~IPT_F_MASK) { | |
150 | duprintf("Unknown flag bits set: %08X\n", | |
151 | ip->flags & ~IPT_F_MASK); | |
ccb79bdc | 152 | return false; |
1da177e4 LT |
153 | } |
154 | if (ip->invflags & ~IPT_INV_MASK) { | |
155 | duprintf("Unknown invflag bits set: %08X\n", | |
156 | ip->invflags & ~IPT_INV_MASK); | |
ccb79bdc | 157 | return false; |
1da177e4 | 158 | } |
ccb79bdc | 159 | return true; |
1da177e4 LT |
160 | } |
161 | ||
162 | static unsigned int | |
4b560b44 | 163 | ipt_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 LT |
164 | { |
165 | if (net_ratelimit()) | |
ff67e4e4 | 166 | pr_info("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
167 | |
168 | return NF_DROP; | |
169 | } | |
170 | ||
022748a9 | 171 | /* Performance critical */ |
1da177e4 | 172 | static inline struct ipt_entry * |
d5d1baa1 | 173 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
174 | { |
175 | return (struct ipt_entry *)(base + offset); | |
176 | } | |
177 | ||
ba9dda3a | 178 | /* All zeroes == unconditional rule. */ |
022748a9 | 179 | /* Mildly perf critical (only if packet tracing is on) */ |
47901dc2 | 180 | static inline bool unconditional(const struct ipt_ip *ip) |
ba9dda3a | 181 | { |
47901dc2 | 182 | static const struct ipt_ip uncond; |
ba9dda3a | 183 | |
47901dc2 | 184 | return memcmp(ip, &uncond, sizeof(uncond)) == 0; |
e79ec50b | 185 | #undef FWINV |
ba9dda3a JK |
186 | } |
187 | ||
d5d1baa1 JE |
188 | /* for const-correctness */ |
189 | static inline const struct ipt_entry_target * | |
190 | ipt_get_target_c(const struct ipt_entry *e) | |
191 | { | |
192 | return ipt_get_target((struct ipt_entry *)e); | |
193 | } | |
194 | ||
ba9dda3a JK |
195 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
196 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
022748a9 | 197 | static const char *const hooknames[] = { |
6e23ae2a PM |
198 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
199 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 200 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
201 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
202 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
203 | }; |
204 | ||
205 | enum nf_ip_trace_comments { | |
206 | NF_IP_TRACE_COMMENT_RULE, | |
207 | NF_IP_TRACE_COMMENT_RETURN, | |
208 | NF_IP_TRACE_COMMENT_POLICY, | |
209 | }; | |
210 | ||
022748a9 | 211 | static const char *const comments[] = { |
ba9dda3a JK |
212 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
213 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
214 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
215 | }; | |
216 | ||
217 | static struct nf_loginfo trace_loginfo = { | |
218 | .type = NF_LOG_TYPE_LOG, | |
219 | .u = { | |
220 | .log = { | |
221 | .level = 4, | |
222 | .logflags = NF_LOG_MASK, | |
223 | }, | |
224 | }, | |
225 | }; | |
226 | ||
022748a9 | 227 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 228 | static inline int |
d5d1baa1 | 229 | get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e, |
4f2f6f23 JE |
230 | const char *hookname, const char **chainname, |
231 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 232 | { |
d5d1baa1 | 233 | const struct ipt_standard_target *t = (void *)ipt_get_target_c(s); |
ba9dda3a JK |
234 | |
235 | if (strcmp(t->target.u.kernel.target->name, IPT_ERROR_TARGET) == 0) { | |
236 | /* Head of user chain: ERROR target with chainname */ | |
237 | *chainname = t->target.data; | |
238 | (*rulenum) = 0; | |
239 | } else if (s == e) { | |
240 | (*rulenum)++; | |
241 | ||
3666ed1c JP |
242 | if (s->target_offset == sizeof(struct ipt_entry) && |
243 | strcmp(t->target.u.kernel.target->name, | |
244 | IPT_STANDARD_TARGET) == 0 && | |
245 | t->verdict < 0 && | |
246 | unconditional(&s->ip)) { | |
ba9dda3a JK |
247 | /* Tail of chains: STANDARD target (return/policy) */ |
248 | *comment = *chainname == hookname | |
4f2f6f23 JE |
249 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
250 | : comments[NF_IP_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
251 | } |
252 | return 1; | |
253 | } else | |
254 | (*rulenum)++; | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
d5d1baa1 | 259 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
260 | unsigned int hook, |
261 | const struct net_device *in, | |
262 | const struct net_device *out, | |
ecb6f85e | 263 | const char *tablename, |
d5d1baa1 JE |
264 | const struct xt_table_info *private, |
265 | const struct ipt_entry *e) | |
ba9dda3a | 266 | { |
d5d1baa1 | 267 | const void *table_base; |
5452e425 | 268 | const struct ipt_entry *root; |
4f2f6f23 | 269 | const char *hookname, *chainname, *comment; |
72b2b1dd | 270 | const struct ipt_entry *iter; |
ba9dda3a JK |
271 | unsigned int rulenum = 0; |
272 | ||
ccf5bd8c | 273 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
274 | root = get_entry(table_base, private->hook_entry[hook]); |
275 | ||
4f2f6f23 JE |
276 | hookname = chainname = hooknames[hook]; |
277 | comment = comments[NF_IP_TRACE_COMMENT_RULE]; | |
ba9dda3a | 278 | |
72b2b1dd JE |
279 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
280 | if (get_chainname_rulenum(iter, e, hookname, | |
281 | &chainname, &comment, &rulenum) != 0) | |
282 | break; | |
ba9dda3a JK |
283 | |
284 | nf_log_packet(AF_INET, hook, skb, in, out, &trace_loginfo, | |
285 | "TRACE: %s:%s:%s:%u ", | |
286 | tablename, chainname, comment, rulenum); | |
287 | } | |
288 | #endif | |
289 | ||
98e86403 JE |
290 | static inline __pure |
291 | struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry) | |
292 | { | |
293 | return (void *)entry + entry->next_offset; | |
294 | } | |
295 | ||
1da177e4 LT |
296 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
297 | unsigned int | |
3db05fea | 298 | ipt_do_table(struct sk_buff *skb, |
1da177e4 LT |
299 | unsigned int hook, |
300 | const struct net_device *in, | |
301 | const struct net_device *out, | |
e60a13e0 | 302 | struct xt_table *table) |
1da177e4 LT |
303 | { |
304 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); | |
5452e425 | 305 | const struct iphdr *ip; |
1da177e4 LT |
306 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
307 | unsigned int verdict = NF_DROP; | |
308 | const char *indev, *outdev; | |
d5d1baa1 | 309 | const void *table_base; |
f3c5c1bf JE |
310 | struct ipt_entry *e, **jumpstack; |
311 | unsigned int *stackptr, origptr, cpu; | |
d5d1baa1 | 312 | const struct xt_table_info *private; |
de74c169 | 313 | struct xt_action_param acpar; |
1da177e4 LT |
314 | |
315 | /* Initialization */ | |
3db05fea | 316 | ip = ip_hdr(skb); |
1da177e4 LT |
317 | indev = in ? in->name : nulldevname; |
318 | outdev = out ? out->name : nulldevname; | |
319 | /* We handle fragments by dealing with the first fragment as | |
320 | * if it was a normal packet. All other fragments are treated | |
321 | * normally, except that they will NEVER match rules that ask | |
322 | * things we don't know, ie. tcp syn flag or ports). If the | |
323 | * rule is also a fragment-specific rule, non-fragments won't | |
324 | * match it. */ | |
de74c169 JE |
325 | acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
326 | acpar.thoff = ip_hdrlen(skb); | |
b4ba2611 | 327 | acpar.hotdrop = false; |
de74c169 JE |
328 | acpar.in = in; |
329 | acpar.out = out; | |
330 | acpar.family = NFPROTO_IPV4; | |
331 | acpar.hooknum = hook; | |
1da177e4 | 332 | |
1da177e4 | 333 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
942e4a2b SH |
334 | xt_info_rdlock_bh(); |
335 | private = table->private; | |
f3c5c1bf JE |
336 | cpu = smp_processor_id(); |
337 | table_base = private->entries[cpu]; | |
338 | jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; | |
7489aec8 | 339 | stackptr = per_cpu_ptr(private->stackptr, cpu); |
f3c5c1bf | 340 | origptr = *stackptr; |
78454473 | 341 | |
2e4e6a17 | 342 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 343 | |
cecc74de | 344 | pr_debug("Entering %s(hook %u); sp at %u (UF %p)\n", |
f3c5c1bf JE |
345 | table->name, hook, origptr, |
346 | get_entry(table_base, private->underflow[hook])); | |
1da177e4 LT |
347 | |
348 | do { | |
d5d1baa1 | 349 | const struct ipt_entry_target *t; |
dcea992a | 350 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 351 | |
1da177e4 | 352 | IP_NF_ASSERT(e); |
a1ff4ac8 | 353 | if (!ip_packet_match(ip, indev, outdev, |
de74c169 | 354 | &e->ip, acpar.fragoff)) { |
dcea992a | 355 | no_match: |
a1ff4ac8 JE |
356 | e = ipt_next_entry(e); |
357 | continue; | |
358 | } | |
1da177e4 | 359 | |
ef53d702 | 360 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
361 | acpar.match = ematch->u.kernel.match; |
362 | acpar.matchinfo = ematch->data; | |
363 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 364 | goto no_match; |
ef53d702 | 365 | } |
dcea992a | 366 | |
7df0884c | 367 | ADD_COUNTER(e->counters, skb->len, 1); |
1da177e4 | 368 | |
a1ff4ac8 JE |
369 | t = ipt_get_target(e); |
370 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
371 | |
372 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
373 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
a1ff4ac8 JE |
374 | /* The packet is traced: log it */ |
375 | if (unlikely(skb->nf_trace)) | |
376 | trace_packet(skb, hook, in, out, | |
377 | table->name, private, e); | |
ba9dda3a | 378 | #endif |
a1ff4ac8 JE |
379 | /* Standard target? */ |
380 | if (!t->u.kernel.target->target) { | |
381 | int v; | |
382 | ||
383 | v = ((struct ipt_standard_target *)t)->verdict; | |
384 | if (v < 0) { | |
385 | /* Pop from stack? */ | |
386 | if (v != IPT_RETURN) { | |
387 | verdict = (unsigned)(-v) - 1; | |
388 | break; | |
1da177e4 | 389 | } |
f3c5c1bf JE |
390 | if (*stackptr == 0) { |
391 | e = get_entry(table_base, | |
392 | private->underflow[hook]); | |
cecc74de | 393 | pr_debug("Underflow (this is normal) " |
f3c5c1bf JE |
394 | "to %p\n", e); |
395 | } else { | |
396 | e = jumpstack[--*stackptr]; | |
cecc74de | 397 | pr_debug("Pulled %p out from pos %u\n", |
f3c5c1bf JE |
398 | e, *stackptr); |
399 | e = ipt_next_entry(e); | |
400 | } | |
a1ff4ac8 JE |
401 | continue; |
402 | } | |
3666ed1c JP |
403 | if (table_base + v != ipt_next_entry(e) && |
404 | !(e->ip.flags & IPT_F_GOTO)) { | |
f3c5c1bf JE |
405 | if (*stackptr >= private->stacksize) { |
406 | verdict = NF_DROP; | |
407 | break; | |
408 | } | |
409 | jumpstack[(*stackptr)++] = e; | |
cecc74de | 410 | pr_debug("Pushed %p into pos %u\n", |
f3c5c1bf | 411 | e, *stackptr - 1); |
a1ff4ac8 | 412 | } |
1da177e4 | 413 | |
a1ff4ac8 | 414 | e = get_entry(table_base, v); |
7a6b1c46 JE |
415 | continue; |
416 | } | |
417 | ||
de74c169 JE |
418 | acpar.target = t->u.kernel.target; |
419 | acpar.targinfo = t->data; | |
bb70dfa5 | 420 | |
de74c169 | 421 | verdict = t->u.kernel.target->target(skb, &acpar); |
7a6b1c46 JE |
422 | /* Target might have changed stuff. */ |
423 | ip = ip_hdr(skb); | |
7a6b1c46 JE |
424 | if (verdict == IPT_CONTINUE) |
425 | e = ipt_next_entry(e); | |
426 | else | |
427 | /* Verdict */ | |
428 | break; | |
b4ba2611 | 429 | } while (!acpar.hotdrop); |
942e4a2b | 430 | xt_info_rdunlock_bh(); |
cecc74de | 431 | pr_debug("Exiting %s; resetting sp from %u to %u\n", |
f3c5c1bf JE |
432 | __func__, *stackptr, origptr); |
433 | *stackptr = origptr; | |
1da177e4 LT |
434 | #ifdef DEBUG_ALLOW_ALL |
435 | return NF_ACCEPT; | |
436 | #else | |
b4ba2611 | 437 | if (acpar.hotdrop) |
1da177e4 LT |
438 | return NF_DROP; |
439 | else return verdict; | |
440 | #endif | |
441 | } | |
442 | ||
1da177e4 LT |
443 | /* Figures out from what hook each rule can be called: returns 0 if |
444 | there are loops. Puts hook bitmask in comefrom. */ | |
445 | static int | |
d5d1baa1 | 446 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 447 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
448 | { |
449 | unsigned int hook; | |
450 | ||
451 | /* No recursion; use packet counter to save back ptrs (reset | |
452 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 453 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 454 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 455 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
456 | |
457 | if (!(valid_hooks & (1 << hook))) | |
458 | continue; | |
459 | ||
460 | /* Set initial back pointer. */ | |
461 | e->counters.pcnt = pos; | |
462 | ||
463 | for (;;) { | |
d5d1baa1 JE |
464 | const struct ipt_standard_target *t |
465 | = (void *)ipt_get_target_c(e); | |
e1b4b9f3 | 466 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 467 | |
6e23ae2a | 468 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
654d0fbd | 469 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
470 | hook, pos, e->comefrom); |
471 | return 0; | |
472 | } | |
9c547959 | 473 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
474 | |
475 | /* Unconditional return/END. */ | |
3666ed1c JP |
476 | if ((e->target_offset == sizeof(struct ipt_entry) && |
477 | (strcmp(t->target.u.user.name, | |
478 | IPT_STANDARD_TARGET) == 0) && | |
479 | t->verdict < 0 && unconditional(&e->ip)) || | |
480 | visited) { | |
1da177e4 LT |
481 | unsigned int oldpos, size; |
482 | ||
1f9352ae PM |
483 | if ((strcmp(t->target.u.user.name, |
484 | IPT_STANDARD_TARGET) == 0) && | |
485 | t->verdict < -NF_MAX_VERDICT - 1) { | |
74c9c0c1 DM |
486 | duprintf("mark_source_chains: bad " |
487 | "negative verdict (%i)\n", | |
488 | t->verdict); | |
489 | return 0; | |
490 | } | |
491 | ||
1da177e4 LT |
492 | /* Return: backtrack through the last |
493 | big jump. */ | |
494 | do { | |
6e23ae2a | 495 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
496 | #ifdef DEBUG_IP_FIREWALL_USER |
497 | if (e->comefrom | |
6e23ae2a | 498 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
499 | duprintf("Back unset " |
500 | "on hook %u " | |
501 | "rule %u\n", | |
502 | hook, pos); | |
503 | } | |
504 | #endif | |
505 | oldpos = pos; | |
506 | pos = e->counters.pcnt; | |
507 | e->counters.pcnt = 0; | |
508 | ||
509 | /* We're at the start. */ | |
510 | if (pos == oldpos) | |
511 | goto next; | |
512 | ||
513 | e = (struct ipt_entry *) | |
31836064 | 514 | (entry0 + pos); |
1da177e4 LT |
515 | } while (oldpos == pos + e->next_offset); |
516 | ||
517 | /* Move along one */ | |
518 | size = e->next_offset; | |
519 | e = (struct ipt_entry *) | |
31836064 | 520 | (entry0 + pos + size); |
1da177e4 LT |
521 | e->counters.pcnt = pos; |
522 | pos += size; | |
523 | } else { | |
524 | int newpos = t->verdict; | |
525 | ||
526 | if (strcmp(t->target.u.user.name, | |
3666ed1c JP |
527 | IPT_STANDARD_TARGET) == 0 && |
528 | newpos >= 0) { | |
74c9c0c1 DM |
529 | if (newpos > newinfo->size - |
530 | sizeof(struct ipt_entry)) { | |
531 | duprintf("mark_source_chains: " | |
532 | "bad verdict (%i)\n", | |
533 | newpos); | |
534 | return 0; | |
535 | } | |
1da177e4 LT |
536 | /* This a jump; chase it. */ |
537 | duprintf("Jump rule %u -> %u\n", | |
538 | pos, newpos); | |
539 | } else { | |
540 | /* ... this is a fallthru */ | |
541 | newpos = pos + e->next_offset; | |
542 | } | |
543 | e = (struct ipt_entry *) | |
31836064 | 544 | (entry0 + newpos); |
1da177e4 LT |
545 | e->counters.pcnt = pos; |
546 | pos = newpos; | |
547 | } | |
548 | } | |
549 | next: | |
550 | duprintf("Finished chain %u\n", hook); | |
551 | } | |
552 | return 1; | |
553 | } | |
554 | ||
6bdb331b | 555 | static void cleanup_match(struct ipt_entry_match *m, struct net *net) |
1da177e4 | 556 | { |
6be3d859 JE |
557 | struct xt_mtdtor_param par; |
558 | ||
f54e9367 | 559 | par.net = net; |
6be3d859 JE |
560 | par.match = m->u.kernel.match; |
561 | par.matchinfo = m->data; | |
916a917d | 562 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
563 | if (par.match->destroy != NULL) |
564 | par.match->destroy(&par); | |
565 | module_put(par.match->me); | |
1da177e4 LT |
566 | } |
567 | ||
022748a9 | 568 | static int |
d5d1baa1 | 569 | check_entry(const struct ipt_entry *e, const char *name) |
a96be246 | 570 | { |
d5d1baa1 | 571 | const struct ipt_entry_target *t; |
a96be246 DM |
572 | |
573 | if (!ip_checkentry(&e->ip)) { | |
b5cad0df | 574 | duprintf("ip check failed %p %s.\n", e, par->match->name); |
a96be246 DM |
575 | return -EINVAL; |
576 | } | |
577 | ||
9c547959 PM |
578 | if (e->target_offset + sizeof(struct ipt_entry_target) > |
579 | e->next_offset) | |
a96be246 DM |
580 | return -EINVAL; |
581 | ||
d5d1baa1 | 582 | t = ipt_get_target_c(e); |
a96be246 DM |
583 | if (e->target_offset + t->u.target_size > e->next_offset) |
584 | return -EINVAL; | |
585 | ||
586 | return 0; | |
587 | } | |
588 | ||
022748a9 | 589 | static int |
6bdb331b | 590 | check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par) |
a96be246 | 591 | { |
9b4fce7a | 592 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 DM |
593 | int ret; |
594 | ||
9b4fce7a JE |
595 | par->match = m->u.kernel.match; |
596 | par->matchinfo = m->data; | |
597 | ||
916a917d | 598 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 599 | ip->proto, ip->invflags & IPT_INV_PROTO); |
367c6790 | 600 | if (ret < 0) { |
b5cad0df | 601 | duprintf("check failed for `%s'.\n", par->match->name); |
367c6790 | 602 | return ret; |
a96be246 | 603 | } |
367c6790 | 604 | return 0; |
a96be246 DM |
605 | } |
606 | ||
022748a9 | 607 | static int |
6bdb331b | 608 | find_check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 609 | { |
6709dbbb | 610 | struct xt_match *match; |
3cdc7c95 | 611 | int ret; |
1da177e4 | 612 | |
fd0ec0e6 JE |
613 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
614 | m->u.user.revision); | |
615 | if (IS_ERR(match)) { | |
a96be246 | 616 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 617 | return PTR_ERR(match); |
1da177e4 LT |
618 | } |
619 | m->u.kernel.match = match; | |
620 | ||
6bdb331b | 621 | ret = check_match(m, par); |
3cdc7c95 PM |
622 | if (ret) |
623 | goto err; | |
624 | ||
1da177e4 | 625 | return 0; |
3cdc7c95 PM |
626 | err: |
627 | module_put(m->u.kernel.match->me); | |
628 | return ret; | |
1da177e4 LT |
629 | } |
630 | ||
add67461 | 631 | static int check_target(struct ipt_entry *e, struct net *net, const char *name) |
a96be246 | 632 | { |
af5d6dc2 JE |
633 | struct ipt_entry_target *t = ipt_get_target(e); |
634 | struct xt_tgchk_param par = { | |
add67461 | 635 | .net = net, |
af5d6dc2 JE |
636 | .table = name, |
637 | .entryinfo = e, | |
638 | .target = t->u.kernel.target, | |
639 | .targinfo = t->data, | |
640 | .hook_mask = e->comefrom, | |
916a917d | 641 | .family = NFPROTO_IPV4, |
af5d6dc2 | 642 | }; |
e905a9ed | 643 | int ret; |
a96be246 | 644 | |
916a917d | 645 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 646 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
367c6790 | 647 | if (ret < 0) { |
ff67e4e4 | 648 | duprintf("check failed for `%s'.\n", |
a96be246 | 649 | t->u.kernel.target->name); |
367c6790 | 650 | return ret; |
a96be246 | 651 | } |
367c6790 | 652 | return 0; |
a96be246 | 653 | } |
1da177e4 | 654 | |
022748a9 | 655 | static int |
a83d8e8d | 656 | find_check_entry(struct ipt_entry *e, struct net *net, const char *name, |
0559518b | 657 | unsigned int size) |
1da177e4 LT |
658 | { |
659 | struct ipt_entry_target *t; | |
6709dbbb | 660 | struct xt_target *target; |
1da177e4 LT |
661 | int ret; |
662 | unsigned int j; | |
9b4fce7a | 663 | struct xt_mtchk_param mtpar; |
dcea992a | 664 | struct xt_entry_match *ematch; |
1da177e4 | 665 | |
a96be246 DM |
666 | ret = check_entry(e, name); |
667 | if (ret) | |
668 | return ret; | |
590bdf7f | 669 | |
1da177e4 | 670 | j = 0; |
a83d8e8d | 671 | mtpar.net = net; |
9b4fce7a JE |
672 | mtpar.table = name; |
673 | mtpar.entryinfo = &e->ip; | |
674 | mtpar.hook_mask = e->comefrom; | |
916a917d | 675 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 676 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 677 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 678 | if (ret != 0) |
6bdb331b JE |
679 | goto cleanup_matches; |
680 | ++j; | |
dcea992a | 681 | } |
1da177e4 LT |
682 | |
683 | t = ipt_get_target(e); | |
d2a7b6ba JE |
684 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
685 | t->u.user.revision); | |
686 | if (IS_ERR(target)) { | |
a96be246 | 687 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 688 | ret = PTR_ERR(target); |
1da177e4 LT |
689 | goto cleanup_matches; |
690 | } | |
691 | t->u.kernel.target = target; | |
692 | ||
add67461 | 693 | ret = check_target(e, net, name); |
3cdc7c95 PM |
694 | if (ret) |
695 | goto err; | |
1da177e4 | 696 | return 0; |
3cdc7c95 PM |
697 | err: |
698 | module_put(t->u.kernel.target->me); | |
1da177e4 | 699 | cleanup_matches: |
6bdb331b JE |
700 | xt_ematch_foreach(ematch, e) { |
701 | if (j-- == 0) | |
dcea992a | 702 | break; |
6bdb331b JE |
703 | cleanup_match(ematch, net); |
704 | } | |
1da177e4 LT |
705 | return ret; |
706 | } | |
707 | ||
d5d1baa1 | 708 | static bool check_underflow(const struct ipt_entry *e) |
e2fe35c1 JE |
709 | { |
710 | const struct ipt_entry_target *t; | |
711 | unsigned int verdict; | |
712 | ||
713 | if (!unconditional(&e->ip)) | |
714 | return false; | |
d5d1baa1 | 715 | t = ipt_get_target_c(e); |
e2fe35c1 JE |
716 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
717 | return false; | |
718 | verdict = ((struct ipt_standard_target *)t)->verdict; | |
719 | verdict = -verdict - 1; | |
720 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
721 | } | |
722 | ||
022748a9 | 723 | static int |
1da177e4 | 724 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 725 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
726 | const unsigned char *base, |
727 | const unsigned char *limit, | |
1da177e4 LT |
728 | const unsigned int *hook_entries, |
729 | const unsigned int *underflows, | |
0559518b | 730 | unsigned int valid_hooks) |
1da177e4 LT |
731 | { |
732 | unsigned int h; | |
733 | ||
3666ed1c JP |
734 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 || |
735 | (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { | |
1da177e4 LT |
736 | duprintf("Bad offset %p\n", e); |
737 | return -EINVAL; | |
738 | } | |
739 | ||
740 | if (e->next_offset | |
741 | < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) { | |
742 | duprintf("checking: element %p size %u\n", | |
743 | e, e->next_offset); | |
744 | return -EINVAL; | |
745 | } | |
746 | ||
747 | /* Check hooks & underflows */ | |
6e23ae2a | 748 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
749 | if (!(valid_hooks & (1 << h))) |
750 | continue; | |
1da177e4 LT |
751 | if ((unsigned char *)e - base == hook_entries[h]) |
752 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 753 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
754 | if (!check_underflow(e)) { |
755 | pr_err("Underflows must be unconditional and " | |
756 | "use the STANDARD target with " | |
757 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
758 | return -EINVAL; |
759 | } | |
1da177e4 | 760 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 761 | } |
1da177e4 LT |
762 | } |
763 | ||
1da177e4 | 764 | /* Clear counters and comefrom */ |
2e4e6a17 | 765 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 766 | e->comefrom = 0; |
1da177e4 LT |
767 | return 0; |
768 | } | |
769 | ||
0559518b JE |
770 | static void |
771 | cleanup_entry(struct ipt_entry *e, struct net *net) | |
1da177e4 | 772 | { |
a2df1648 | 773 | struct xt_tgdtor_param par; |
1da177e4 | 774 | struct ipt_entry_target *t; |
dcea992a | 775 | struct xt_entry_match *ematch; |
1da177e4 | 776 | |
1da177e4 | 777 | /* Cleanup all matches */ |
dcea992a | 778 | xt_ematch_foreach(ematch, e) |
6bdb331b | 779 | cleanup_match(ematch, net); |
1da177e4 | 780 | t = ipt_get_target(e); |
a2df1648 | 781 | |
add67461 | 782 | par.net = net; |
a2df1648 JE |
783 | par.target = t->u.kernel.target; |
784 | par.targinfo = t->data; | |
916a917d | 785 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
786 | if (par.target->destroy != NULL) |
787 | par.target->destroy(&par); | |
788 | module_put(par.target->me); | |
1da177e4 LT |
789 | } |
790 | ||
791 | /* Checks and translates the user-supplied table segment (held in | |
792 | newinfo) */ | |
793 | static int | |
0f234214 JE |
794 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
795 | const struct ipt_replace *repl) | |
1da177e4 | 796 | { |
72b2b1dd | 797 | struct ipt_entry *iter; |
1da177e4 | 798 | unsigned int i; |
72b2b1dd | 799 | int ret = 0; |
1da177e4 | 800 | |
0f234214 JE |
801 | newinfo->size = repl->size; |
802 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
803 | |
804 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 805 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
806 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
807 | newinfo->underflow[i] = 0xFFFFFFFF; | |
808 | } | |
809 | ||
810 | duprintf("translate_table: size %u\n", newinfo->size); | |
811 | i = 0; | |
812 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
813 | xt_entry_foreach(iter, entry0, newinfo->size) { |
814 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
815 | entry0 + repl->size, |
816 | repl->hook_entry, | |
817 | repl->underflow, | |
818 | repl->valid_hooks); | |
72b2b1dd | 819 | if (ret != 0) |
0559518b JE |
820 | return ret; |
821 | ++i; | |
f3c5c1bf JE |
822 | if (strcmp(ipt_get_target(iter)->u.user.name, |
823 | XT_ERROR_TARGET) == 0) | |
824 | ++newinfo->stacksize; | |
72b2b1dd | 825 | } |
1da177e4 | 826 | |
0f234214 | 827 | if (i != repl->num_entries) { |
1da177e4 | 828 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 829 | i, repl->num_entries); |
1da177e4 LT |
830 | return -EINVAL; |
831 | } | |
832 | ||
833 | /* Check hooks all assigned */ | |
6e23ae2a | 834 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 835 | /* Only hooks which are valid */ |
0f234214 | 836 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
837 | continue; |
838 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
839 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 840 | i, repl->hook_entry[i]); |
1da177e4 LT |
841 | return -EINVAL; |
842 | } | |
843 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
844 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 845 | i, repl->underflow[i]); |
1da177e4 LT |
846 | return -EINVAL; |
847 | } | |
848 | } | |
849 | ||
0f234214 | 850 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
851 | return -ELOOP; |
852 | ||
1da177e4 LT |
853 | /* Finally, each sanity check must pass */ |
854 | i = 0; | |
72b2b1dd | 855 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 856 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
857 | if (ret != 0) |
858 | break; | |
0559518b | 859 | ++i; |
72b2b1dd | 860 | } |
1da177e4 | 861 | |
74c9c0c1 | 862 | if (ret != 0) { |
0559518b JE |
863 | xt_entry_foreach(iter, entry0, newinfo->size) { |
864 | if (i-- == 0) | |
72b2b1dd | 865 | break; |
0559518b JE |
866 | cleanup_entry(iter, net); |
867 | } | |
74c9c0c1 DM |
868 | return ret; |
869 | } | |
1da177e4 LT |
870 | |
871 | /* And one copy for every other CPU */ | |
6f912042 | 872 | for_each_possible_cpu(i) { |
31836064 ED |
873 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
874 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
875 | } |
876 | ||
877 | return ret; | |
878 | } | |
879 | ||
1da177e4 | 880 | static void |
2e4e6a17 HW |
881 | get_counters(const struct xt_table_info *t, |
882 | struct xt_counters counters[]) | |
1da177e4 | 883 | { |
72b2b1dd | 884 | struct ipt_entry *iter; |
1da177e4 LT |
885 | unsigned int cpu; |
886 | unsigned int i; | |
24b36f01 | 887 | unsigned int curcpu = get_cpu(); |
31836064 ED |
888 | |
889 | /* Instead of clearing (by a previous call to memset()) | |
890 | * the counters and using adds, we set the counters | |
942e4a2b SH |
891 | * with data used by 'current' CPU. |
892 | * | |
893 | * Bottom half has to be disabled to prevent deadlock | |
894 | * if new softirq were to run and call ipt_do_table | |
31836064 | 895 | */ |
942e4a2b | 896 | local_bh_disable(); |
31836064 | 897 | i = 0; |
0559518b JE |
898 | xt_entry_foreach(iter, t->entries[curcpu], t->size) { |
899 | SET_COUNTER(counters[i], iter->counters.bcnt, | |
6b4ff2d7 | 900 | iter->counters.pcnt); |
0559518b JE |
901 | ++i; |
902 | } | |
24b36f01 ED |
903 | local_bh_enable(); |
904 | /* Processing counters from other cpus, we can let bottom half enabled, | |
905 | * (preemption is disabled) | |
906 | */ | |
1da177e4 | 907 | |
6f912042 | 908 | for_each_possible_cpu(cpu) { |
31836064 ED |
909 | if (cpu == curcpu) |
910 | continue; | |
1da177e4 | 911 | i = 0; |
001389b9 | 912 | local_bh_disable(); |
942e4a2b | 913 | xt_info_wrlock(cpu); |
0559518b JE |
914 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
915 | ADD_COUNTER(counters[i], iter->counters.bcnt, | |
6b4ff2d7 | 916 | iter->counters.pcnt); |
0559518b JE |
917 | ++i; /* macro does multi eval of i */ |
918 | } | |
942e4a2b | 919 | xt_info_wrunlock(cpu); |
001389b9 | 920 | local_bh_enable(); |
1da177e4 | 921 | } |
24b36f01 | 922 | put_cpu(); |
78454473 SH |
923 | } |
924 | ||
d5d1baa1 | 925 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 926 | { |
2722971c | 927 | unsigned int countersize; |
2e4e6a17 | 928 | struct xt_counters *counters; |
d5d1baa1 | 929 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
930 | |
931 | /* We need atomic snapshot of counters: rest doesn't change | |
932 | (other than comefrom, which userspace doesn't care | |
933 | about). */ | |
2e4e6a17 | 934 | countersize = sizeof(struct xt_counters) * private->number; |
e12f8e29 | 935 | counters = vmalloc(countersize); |
1da177e4 LT |
936 | |
937 | if (counters == NULL) | |
942e4a2b | 938 | return ERR_PTR(-ENOMEM); |
78454473 | 939 | |
942e4a2b | 940 | get_counters(private, counters); |
1da177e4 | 941 | |
2722971c DM |
942 | return counters; |
943 | } | |
944 | ||
945 | static int | |
946 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 947 | const struct xt_table *table, |
2722971c DM |
948 | void __user *userptr) |
949 | { | |
950 | unsigned int off, num; | |
d5d1baa1 | 951 | const struct ipt_entry *e; |
2722971c | 952 | struct xt_counters *counters; |
5452e425 | 953 | const struct xt_table_info *private = table->private; |
2722971c | 954 | int ret = 0; |
5452e425 | 955 | const void *loc_cpu_entry; |
2722971c DM |
956 | |
957 | counters = alloc_counters(table); | |
958 | if (IS_ERR(counters)) | |
959 | return PTR_ERR(counters); | |
960 | ||
31836064 ED |
961 | /* choose the copy that is on our node/cpu, ... |
962 | * This choice is lazy (because current thread is | |
963 | * allowed to migrate to another cpu) | |
964 | */ | |
2e4e6a17 | 965 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 966 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
967 | ret = -EFAULT; |
968 | goto free_counters; | |
969 | } | |
970 | ||
971 | /* FIXME: use iterator macros --RR */ | |
972 | /* ... then go back and fix counters and names */ | |
973 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
974 | unsigned int i; | |
5452e425 JE |
975 | const struct ipt_entry_match *m; |
976 | const struct ipt_entry_target *t; | |
1da177e4 | 977 | |
31836064 | 978 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
979 | if (copy_to_user(userptr + off |
980 | + offsetof(struct ipt_entry, counters), | |
981 | &counters[num], | |
982 | sizeof(counters[num])) != 0) { | |
983 | ret = -EFAULT; | |
984 | goto free_counters; | |
985 | } | |
986 | ||
987 | for (i = sizeof(struct ipt_entry); | |
988 | i < e->target_offset; | |
989 | i += m->u.match_size) { | |
990 | m = (void *)e + i; | |
991 | ||
992 | if (copy_to_user(userptr + off + i | |
993 | + offsetof(struct ipt_entry_match, | |
994 | u.user.name), | |
995 | m->u.kernel.match->name, | |
996 | strlen(m->u.kernel.match->name)+1) | |
997 | != 0) { | |
998 | ret = -EFAULT; | |
999 | goto free_counters; | |
1000 | } | |
1001 | } | |
1002 | ||
d5d1baa1 | 1003 | t = ipt_get_target_c(e); |
1da177e4 LT |
1004 | if (copy_to_user(userptr + off + e->target_offset |
1005 | + offsetof(struct ipt_entry_target, | |
1006 | u.user.name), | |
1007 | t->u.kernel.target->name, | |
1008 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1009 | ret = -EFAULT; | |
1010 | goto free_counters; | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | free_counters: | |
1015 | vfree(counters); | |
1016 | return ret; | |
1017 | } | |
1018 | ||
2722971c | 1019 | #ifdef CONFIG_COMPAT |
739674fb | 1020 | static void compat_standard_from_user(void *dst, const void *src) |
2722971c | 1021 | { |
9fa492cd | 1022 | int v = *(compat_int_t *)src; |
2722971c | 1023 | |
9fa492cd | 1024 | if (v > 0) |
b386d9f5 | 1025 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1026 | memcpy(dst, &v, sizeof(v)); |
1027 | } | |
46c5ea3c | 1028 | |
739674fb | 1029 | static int compat_standard_to_user(void __user *dst, const void *src) |
2722971c | 1030 | { |
9fa492cd | 1031 | compat_int_t cv = *(int *)src; |
2722971c | 1032 | |
9fa492cd | 1033 | if (cv > 0) |
b386d9f5 | 1034 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1035 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1036 | } |
1037 | ||
d5d1baa1 | 1038 | static int compat_calc_entry(const struct ipt_entry *e, |
4b478248 | 1039 | const struct xt_table_info *info, |
d5d1baa1 | 1040 | const void *base, struct xt_table_info *newinfo) |
2722971c | 1041 | { |
dcea992a | 1042 | const struct xt_entry_match *ematch; |
d5d1baa1 | 1043 | const struct ipt_entry_target *t; |
e5b5ef7d | 1044 | unsigned int entry_offset; |
2722971c DM |
1045 | int off, i, ret; |
1046 | ||
30c08c41 | 1047 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c | 1048 | entry_offset = (void *)e - base; |
dcea992a | 1049 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1050 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1051 | t = ipt_get_target_c(e); |
9fa492cd | 1052 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1053 | newinfo->size -= off; |
b386d9f5 | 1054 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1055 | if (ret) |
1056 | return ret; | |
1057 | ||
6e23ae2a | 1058 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1059 | if (info->hook_entry[i] && |
1060 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1061 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1062 | if (info->underflow[i] && |
1063 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1064 | newinfo->underflow[i] -= off; |
1065 | } | |
1066 | return 0; | |
1067 | } | |
1068 | ||
259d4e41 | 1069 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1070 | struct xt_table_info *newinfo) |
2722971c | 1071 | { |
72b2b1dd | 1072 | struct ipt_entry *iter; |
2722971c | 1073 | void *loc_cpu_entry; |
0559518b | 1074 | int ret; |
2722971c DM |
1075 | |
1076 | if (!newinfo || !info) | |
1077 | return -EINVAL; | |
1078 | ||
259d4e41 ED |
1079 | /* we dont care about newinfo->entries[] */ |
1080 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1081 | newinfo->initial_entries = 0; | |
2722971c | 1082 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
72b2b1dd JE |
1083 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1084 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1085 | if (ret != 0) | |
0559518b | 1086 | return ret; |
72b2b1dd | 1087 | } |
0559518b | 1088 | return 0; |
2722971c DM |
1089 | } |
1090 | #endif | |
1091 | ||
d5d1baa1 JE |
1092 | static int get_info(struct net *net, void __user *user, |
1093 | const int *len, int compat) | |
2722971c DM |
1094 | { |
1095 | char name[IPT_TABLE_MAXNAMELEN]; | |
e60a13e0 | 1096 | struct xt_table *t; |
2722971c DM |
1097 | int ret; |
1098 | ||
1099 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1100 | duprintf("length %u != %zu\n", *len, |
1101 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1102 | return -EINVAL; |
1103 | } | |
1104 | ||
1105 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1106 | return -EFAULT; | |
1107 | ||
1108 | name[IPT_TABLE_MAXNAMELEN-1] = '\0'; | |
1109 | #ifdef CONFIG_COMPAT | |
1110 | if (compat) | |
1111 | xt_compat_lock(AF_INET); | |
1112 | #endif | |
34bd137b | 1113 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1114 | "iptable_%s", name); |
2722971c DM |
1115 | if (t && !IS_ERR(t)) { |
1116 | struct ipt_getinfo info; | |
5452e425 | 1117 | const struct xt_table_info *private = t->private; |
2722971c | 1118 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1119 | struct xt_table_info tmp; |
1120 | ||
2722971c | 1121 | if (compat) { |
2722971c | 1122 | ret = compat_table_info(private, &tmp); |
b386d9f5 | 1123 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1124 | private = &tmp; |
2722971c DM |
1125 | } |
1126 | #endif | |
1127 | info.valid_hooks = t->valid_hooks; | |
1128 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1129 | sizeof(info.hook_entry)); |
2722971c | 1130 | memcpy(info.underflow, private->underflow, |
4b478248 | 1131 | sizeof(info.underflow)); |
2722971c DM |
1132 | info.num_entries = private->number; |
1133 | info.size = private->size; | |
1134 | strcpy(info.name, name); | |
1135 | ||
1136 | if (copy_to_user(user, &info, *len) != 0) | |
1137 | ret = -EFAULT; | |
1138 | else | |
1139 | ret = 0; | |
1140 | ||
1141 | xt_table_unlock(t); | |
1142 | module_put(t->me); | |
1143 | } else | |
1144 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1145 | #ifdef CONFIG_COMPAT | |
1146 | if (compat) | |
1147 | xt_compat_unlock(AF_INET); | |
1148 | #endif | |
1149 | return ret; | |
1150 | } | |
1151 | ||
1152 | static int | |
d5d1baa1 JE |
1153 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
1154 | const int *len) | |
2722971c DM |
1155 | { |
1156 | int ret; | |
1157 | struct ipt_get_entries get; | |
e60a13e0 | 1158 | struct xt_table *t; |
2722971c DM |
1159 | |
1160 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1161 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1162 | return -EINVAL; |
1163 | } | |
1164 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1165 | return -EFAULT; | |
1166 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1167 | duprintf("get_entries: %u != %zu\n", |
1168 | *len, sizeof(get) + get.size); | |
2722971c DM |
1169 | return -EINVAL; |
1170 | } | |
1171 | ||
34bd137b | 1172 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1173 | if (t && !IS_ERR(t)) { |
5452e425 | 1174 | const struct xt_table_info *private = t->private; |
9c547959 | 1175 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1176 | if (get.size == private->size) |
1177 | ret = copy_entries_to_user(private->size, | |
1178 | t, uptr->entrytable); | |
1179 | else { | |
1180 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1181 | private->size, get.size); |
544473c1 | 1182 | ret = -EAGAIN; |
2722971c DM |
1183 | } |
1184 | module_put(t->me); | |
1185 | xt_table_unlock(t); | |
1186 | } else | |
1187 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1188 | ||
1189 | return ret; | |
1190 | } | |
1191 | ||
1192 | static int | |
34bd137b | 1193 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1194 | struct xt_table_info *newinfo, unsigned int num_counters, |
1195 | void __user *counters_ptr) | |
2722971c DM |
1196 | { |
1197 | int ret; | |
e60a13e0 | 1198 | struct xt_table *t; |
2722971c DM |
1199 | struct xt_table_info *oldinfo; |
1200 | struct xt_counters *counters; | |
1201 | void *loc_cpu_old_entry; | |
72b2b1dd | 1202 | struct ipt_entry *iter; |
2722971c DM |
1203 | |
1204 | ret = 0; | |
1205 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); | |
1206 | if (!counters) { | |
1207 | ret = -ENOMEM; | |
1208 | goto out; | |
1209 | } | |
1210 | ||
34bd137b | 1211 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c DM |
1212 | "iptable_%s", name); |
1213 | if (!t || IS_ERR(t)) { | |
1214 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1215 | goto free_newinfo_counters_untrans; | |
1216 | } | |
1217 | ||
1218 | /* You lied! */ | |
1219 | if (valid_hooks != t->valid_hooks) { | |
1220 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1221 | valid_hooks, t->valid_hooks); | |
1222 | ret = -EINVAL; | |
1223 | goto put_module; | |
1224 | } | |
1225 | ||
1226 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1227 | if (!oldinfo) | |
1228 | goto put_module; | |
1229 | ||
1230 | /* Update module usage count based on number of rules */ | |
1231 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1232 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1233 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1234 | (newinfo->number <= oldinfo->initial_entries)) | |
1235 | module_put(t->me); | |
1236 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1237 | (newinfo->number <= oldinfo->initial_entries)) | |
1238 | module_put(t->me); | |
1239 | ||
942e4a2b | 1240 | /* Get the old counters, and synchronize with replace */ |
2722971c | 1241 | get_counters(oldinfo, counters); |
942e4a2b | 1242 | |
2722971c DM |
1243 | /* Decrease module usage counts and free resource */ |
1244 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
72b2b1dd | 1245 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1246 | cleanup_entry(iter, net); |
72b2b1dd | 1247 | |
2722971c DM |
1248 | xt_free_table_info(oldinfo); |
1249 | if (copy_to_user(counters_ptr, counters, | |
1250 | sizeof(struct xt_counters) * num_counters) != 0) | |
1251 | ret = -EFAULT; | |
1252 | vfree(counters); | |
1253 | xt_table_unlock(t); | |
1254 | return ret; | |
1255 | ||
1256 | put_module: | |
1257 | module_put(t->me); | |
1258 | xt_table_unlock(t); | |
1259 | free_newinfo_counters_untrans: | |
1260 | vfree(counters); | |
1261 | out: | |
1262 | return ret; | |
1263 | } | |
1264 | ||
1265 | static int | |
d5d1baa1 | 1266 | do_replace(struct net *net, const void __user *user, unsigned int len) |
2722971c DM |
1267 | { |
1268 | int ret; | |
1269 | struct ipt_replace tmp; | |
1270 | struct xt_table_info *newinfo; | |
1271 | void *loc_cpu_entry; | |
72b2b1dd | 1272 | struct ipt_entry *iter; |
2722971c DM |
1273 | |
1274 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1275 | return -EFAULT; | |
1276 | ||
2722971c | 1277 | /* overflow check */ |
2722971c DM |
1278 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1279 | return -ENOMEM; | |
1280 | ||
1281 | newinfo = xt_alloc_table_info(tmp.size); | |
1282 | if (!newinfo) | |
1283 | return -ENOMEM; | |
1284 | ||
9c547959 | 1285 | /* choose the copy that is on our node/cpu */ |
2722971c DM |
1286 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1287 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1288 | tmp.size) != 0) { | |
1289 | ret = -EFAULT; | |
1290 | goto free_newinfo; | |
1291 | } | |
1292 | ||
0f234214 | 1293 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
2722971c DM |
1294 | if (ret != 0) |
1295 | goto free_newinfo; | |
1296 | ||
ff67e4e4 | 1297 | duprintf("Translated table\n"); |
2722971c | 1298 | |
34bd137b | 1299 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1300 | tmp.num_counters, tmp.counters); |
2722971c DM |
1301 | if (ret) |
1302 | goto free_newinfo_untrans; | |
1303 | return 0; | |
1304 | ||
1305 | free_newinfo_untrans: | |
72b2b1dd | 1306 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1307 | cleanup_entry(iter, net); |
2722971c DM |
1308 | free_newinfo: |
1309 | xt_free_table_info(newinfo); | |
1310 | return ret; | |
1311 | } | |
1312 | ||
2722971c | 1313 | static int |
d5d1baa1 JE |
1314 | do_add_counters(struct net *net, const void __user *user, |
1315 | unsigned int len, int compat) | |
2722971c | 1316 | { |
942e4a2b | 1317 | unsigned int i, curcpu; |
2722971c DM |
1318 | struct xt_counters_info tmp; |
1319 | struct xt_counters *paddc; | |
1320 | unsigned int num_counters; | |
5452e425 | 1321 | const char *name; |
2722971c DM |
1322 | int size; |
1323 | void *ptmp; | |
e60a13e0 | 1324 | struct xt_table *t; |
5452e425 | 1325 | const struct xt_table_info *private; |
2722971c DM |
1326 | int ret = 0; |
1327 | void *loc_cpu_entry; | |
72b2b1dd | 1328 | struct ipt_entry *iter; |
2722971c DM |
1329 | #ifdef CONFIG_COMPAT |
1330 | struct compat_xt_counters_info compat_tmp; | |
1331 | ||
1332 | if (compat) { | |
1333 | ptmp = &compat_tmp; | |
1334 | size = sizeof(struct compat_xt_counters_info); | |
1335 | } else | |
1336 | #endif | |
1337 | { | |
1338 | ptmp = &tmp; | |
1339 | size = sizeof(struct xt_counters_info); | |
1340 | } | |
1341 | ||
1342 | if (copy_from_user(ptmp, user, size) != 0) | |
1343 | return -EFAULT; | |
1344 | ||
1345 | #ifdef CONFIG_COMPAT | |
1346 | if (compat) { | |
1347 | num_counters = compat_tmp.num_counters; | |
1348 | name = compat_tmp.name; | |
1349 | } else | |
1350 | #endif | |
1351 | { | |
1352 | num_counters = tmp.num_counters; | |
1353 | name = tmp.name; | |
1354 | } | |
1355 | ||
1356 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1357 | return -EINVAL; | |
1358 | ||
e12f8e29 | 1359 | paddc = vmalloc(len - size); |
2722971c DM |
1360 | if (!paddc) |
1361 | return -ENOMEM; | |
1362 | ||
1363 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1364 | ret = -EFAULT; | |
1365 | goto free; | |
1366 | } | |
1367 | ||
34bd137b | 1368 | t = xt_find_table_lock(net, AF_INET, name); |
2722971c DM |
1369 | if (!t || IS_ERR(t)) { |
1370 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1371 | goto free; | |
1372 | } | |
1373 | ||
942e4a2b | 1374 | local_bh_disable(); |
2722971c DM |
1375 | private = t->private; |
1376 | if (private->number != num_counters) { | |
1377 | ret = -EINVAL; | |
1378 | goto unlock_up_free; | |
1379 | } | |
1380 | ||
1381 | i = 0; | |
1382 | /* Choose the copy that is on our node */ | |
942e4a2b SH |
1383 | curcpu = smp_processor_id(); |
1384 | loc_cpu_entry = private->entries[curcpu]; | |
1385 | xt_info_wrlock(curcpu); | |
0559518b JE |
1386 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1387 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1388 | ++i; | |
1389 | } | |
942e4a2b | 1390 | xt_info_wrunlock(curcpu); |
2722971c | 1391 | unlock_up_free: |
942e4a2b | 1392 | local_bh_enable(); |
2722971c DM |
1393 | xt_table_unlock(t); |
1394 | module_put(t->me); | |
1395 | free: | |
1396 | vfree(paddc); | |
1397 | ||
1398 | return ret; | |
1399 | } | |
1400 | ||
1401 | #ifdef CONFIG_COMPAT | |
1402 | struct compat_ipt_replace { | |
1403 | char name[IPT_TABLE_MAXNAMELEN]; | |
1404 | u32 valid_hooks; | |
1405 | u32 num_entries; | |
1406 | u32 size; | |
6e23ae2a PM |
1407 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1408 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c DM |
1409 | u32 num_counters; |
1410 | compat_uptr_t counters; /* struct ipt_counters * */ | |
1411 | struct compat_ipt_entry entries[0]; | |
1412 | }; | |
1413 | ||
a18aa31b PM |
1414 | static int |
1415 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1416 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1417 | unsigned int i) |
2722971c | 1418 | { |
3e597c60 | 1419 | struct ipt_entry_target *t; |
2722971c DM |
1420 | struct compat_ipt_entry __user *ce; |
1421 | u_int16_t target_offset, next_offset; | |
1422 | compat_uint_t origsize; | |
dcea992a JE |
1423 | const struct xt_entry_match *ematch; |
1424 | int ret = 0; | |
2722971c | 1425 | |
2722971c DM |
1426 | origsize = *size; |
1427 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
0559518b JE |
1428 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
1429 | copy_to_user(&ce->counters, &counters[i], | |
1430 | sizeof(counters[i])) != 0) | |
1431 | return -EFAULT; | |
a18aa31b | 1432 | |
2722971c | 1433 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1434 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1435 | ||
dcea992a JE |
1436 | xt_ematch_foreach(ematch, e) { |
1437 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1438 | if (ret != 0) | |
6bdb331b | 1439 | return ret; |
dcea992a | 1440 | } |
2722971c | 1441 | target_offset = e->target_offset - (origsize - *size); |
2722971c | 1442 | t = ipt_get_target(e); |
9fa492cd | 1443 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c | 1444 | if (ret) |
0559518b | 1445 | return ret; |
2722971c | 1446 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1447 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1448 | put_user(next_offset, &ce->next_offset) != 0) | |
1449 | return -EFAULT; | |
2722971c | 1450 | return 0; |
2722971c DM |
1451 | } |
1452 | ||
022748a9 | 1453 | static int |
4c1b52bc | 1454 | compat_find_calc_match(struct ipt_entry_match *m, |
4b478248 PM |
1455 | const char *name, |
1456 | const struct ipt_ip *ip, | |
1457 | unsigned int hookmask, | |
6bdb331b | 1458 | int *size) |
2722971c | 1459 | { |
6709dbbb | 1460 | struct xt_match *match; |
2722971c | 1461 | |
fd0ec0e6 JE |
1462 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
1463 | m->u.user.revision); | |
1464 | if (IS_ERR(match)) { | |
2722971c | 1465 | duprintf("compat_check_calc_match: `%s' not found\n", |
4b478248 | 1466 | m->u.user.name); |
fd0ec0e6 | 1467 | return PTR_ERR(match); |
2722971c DM |
1468 | } |
1469 | m->u.kernel.match = match; | |
9fa492cd | 1470 | *size += xt_compat_match_offset(match); |
4c1b52bc DM |
1471 | return 0; |
1472 | } | |
1473 | ||
0559518b | 1474 | static void compat_release_entry(struct compat_ipt_entry *e) |
4c1b52bc DM |
1475 | { |
1476 | struct ipt_entry_target *t; | |
dcea992a | 1477 | struct xt_entry_match *ematch; |
4c1b52bc | 1478 | |
4c1b52bc | 1479 | /* Cleanup all matches */ |
dcea992a | 1480 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1481 | module_put(ematch->u.kernel.match->me); |
73cd598d | 1482 | t = compat_ipt_get_target(e); |
4c1b52bc | 1483 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1484 | } |
1485 | ||
022748a9 | 1486 | static int |
73cd598d | 1487 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1488 | struct xt_table_info *newinfo, |
1489 | unsigned int *size, | |
d5d1baa1 JE |
1490 | const unsigned char *base, |
1491 | const unsigned char *limit, | |
1492 | const unsigned int *hook_entries, | |
1493 | const unsigned int *underflows, | |
4b478248 | 1494 | const char *name) |
2722971c | 1495 | { |
dcea992a | 1496 | struct xt_entry_match *ematch; |
2722971c | 1497 | struct ipt_entry_target *t; |
6709dbbb | 1498 | struct xt_target *target; |
e5b5ef7d | 1499 | unsigned int entry_offset; |
b0a6363c PM |
1500 | unsigned int j; |
1501 | int ret, off, h; | |
2722971c DM |
1502 | |
1503 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1504 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
1505 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { | |
2722971c DM |
1506 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1507 | return -EINVAL; | |
1508 | } | |
1509 | ||
1510 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1511 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1512 | duprintf("checking: element %p size %u\n", |
1513 | e, e->next_offset); | |
1514 | return -EINVAL; | |
1515 | } | |
1516 | ||
73cd598d PM |
1517 | /* For purposes of check_entry casting the compat entry is fine */ |
1518 | ret = check_entry((struct ipt_entry *)e, name); | |
a96be246 DM |
1519 | if (ret) |
1520 | return ret; | |
590bdf7f | 1521 | |
30c08c41 | 1522 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1523 | entry_offset = (void *)e - (void *)base; |
1524 | j = 0; | |
dcea992a JE |
1525 | xt_ematch_foreach(ematch, e) { |
1526 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1527 | &e->ip, e->comefrom, &off); |
dcea992a | 1528 | if (ret != 0) |
6bdb331b JE |
1529 | goto release_matches; |
1530 | ++j; | |
dcea992a | 1531 | } |
2722971c | 1532 | |
73cd598d | 1533 | t = compat_ipt_get_target(e); |
d2a7b6ba JE |
1534 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
1535 | t->u.user.revision); | |
1536 | if (IS_ERR(target)) { | |
a96be246 | 1537 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1538 | t->u.user.name); |
d2a7b6ba | 1539 | ret = PTR_ERR(target); |
4c1b52bc | 1540 | goto release_matches; |
2722971c DM |
1541 | } |
1542 | t->u.kernel.target = target; | |
1543 | ||
9fa492cd | 1544 | off += xt_compat_target_offset(target); |
2722971c | 1545 | *size += off; |
b386d9f5 | 1546 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1547 | if (ret) |
1548 | goto out; | |
1549 | ||
1550 | /* Check hooks & underflows */ | |
6e23ae2a | 1551 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1552 | if ((unsigned char *)e - base == hook_entries[h]) |
1553 | newinfo->hook_entry[h] = hook_entries[h]; | |
1554 | if ((unsigned char *)e - base == underflows[h]) | |
1555 | newinfo->underflow[h] = underflows[h]; | |
1556 | } | |
1557 | ||
1558 | /* Clear counters and comefrom */ | |
73cd598d | 1559 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c | 1560 | e->comefrom = 0; |
2722971c | 1561 | return 0; |
bec71b16 | 1562 | |
2722971c | 1563 | out: |
bec71b16 | 1564 | module_put(t->u.kernel.target->me); |
4c1b52bc | 1565 | release_matches: |
6bdb331b JE |
1566 | xt_ematch_foreach(ematch, e) { |
1567 | if (j-- == 0) | |
dcea992a | 1568 | break; |
6bdb331b JE |
1569 | module_put(ematch->u.kernel.match->me); |
1570 | } | |
2722971c DM |
1571 | return ret; |
1572 | } | |
1573 | ||
4b478248 | 1574 | static int |
73cd598d | 1575 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1576 | unsigned int *size, const char *name, |
1577 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c DM |
1578 | { |
1579 | struct ipt_entry_target *t; | |
6709dbbb | 1580 | struct xt_target *target; |
2722971c DM |
1581 | struct ipt_entry *de; |
1582 | unsigned int origsize; | |
920b868a | 1583 | int ret, h; |
dcea992a | 1584 | struct xt_entry_match *ematch; |
2722971c DM |
1585 | |
1586 | ret = 0; | |
1587 | origsize = *size; | |
1588 | de = (struct ipt_entry *)*dstptr; | |
1589 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1590 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1591 | |
73cd598d | 1592 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1593 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1594 | ||
dcea992a JE |
1595 | xt_ematch_foreach(ematch, e) { |
1596 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1597 | if (ret != 0) | |
6bdb331b | 1598 | return ret; |
dcea992a | 1599 | } |
2722971c | 1600 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1601 | t = compat_ipt_get_target(e); |
2722971c | 1602 | target = t->u.kernel.target; |
9fa492cd | 1603 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1604 | |
1605 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1606 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1607 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1608 | newinfo->hook_entry[h] -= origsize - *size; | |
1609 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1610 | newinfo->underflow[h] -= origsize - *size; | |
1611 | } | |
f6677f43 DM |
1612 | return ret; |
1613 | } | |
1614 | ||
022748a9 | 1615 | static int |
0559518b | 1616 | compat_check_entry(struct ipt_entry *e, struct net *net, const char *name) |
f6677f43 | 1617 | { |
dcea992a | 1618 | struct xt_entry_match *ematch; |
9b4fce7a | 1619 | struct xt_mtchk_param mtpar; |
b0a6363c | 1620 | unsigned int j; |
dcea992a | 1621 | int ret = 0; |
f6677f43 | 1622 | |
4c1b52bc | 1623 | j = 0; |
a83d8e8d | 1624 | mtpar.net = net; |
9b4fce7a JE |
1625 | mtpar.table = name; |
1626 | mtpar.entryinfo = &e->ip; | |
1627 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1628 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 1629 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1630 | ret = check_match(ematch, &mtpar); |
dcea992a | 1631 | if (ret != 0) |
6bdb331b JE |
1632 | goto cleanup_matches; |
1633 | ++j; | |
dcea992a | 1634 | } |
4c1b52bc | 1635 | |
add67461 | 1636 | ret = check_target(e, net, name); |
4c1b52bc DM |
1637 | if (ret) |
1638 | goto cleanup_matches; | |
4c1b52bc DM |
1639 | return 0; |
1640 | ||
1641 | cleanup_matches: | |
6bdb331b JE |
1642 | xt_ematch_foreach(ematch, e) { |
1643 | if (j-- == 0) | |
dcea992a | 1644 | break; |
6bdb331b JE |
1645 | cleanup_match(ematch, net); |
1646 | } | |
4c1b52bc | 1647 | return ret; |
f6677f43 DM |
1648 | } |
1649 | ||
1da177e4 | 1650 | static int |
a83d8e8d AD |
1651 | translate_compat_table(struct net *net, |
1652 | const char *name, | |
4b478248 PM |
1653 | unsigned int valid_hooks, |
1654 | struct xt_table_info **pinfo, | |
1655 | void **pentry0, | |
1656 | unsigned int total_size, | |
1657 | unsigned int number, | |
1658 | unsigned int *hook_entries, | |
1659 | unsigned int *underflows) | |
1da177e4 | 1660 | { |
920b868a | 1661 | unsigned int i, j; |
2722971c DM |
1662 | struct xt_table_info *newinfo, *info; |
1663 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1664 | struct compat_ipt_entry *iter0; |
1665 | struct ipt_entry *iter1; | |
2722971c | 1666 | unsigned int size; |
0559518b | 1667 | int ret; |
1da177e4 | 1668 | |
2722971c DM |
1669 | info = *pinfo; |
1670 | entry0 = *pentry0; | |
1671 | size = total_size; | |
1672 | info->number = number; | |
1673 | ||
1674 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1675 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1676 | info->hook_entry[i] = 0xFFFFFFFF; |
1677 | info->underflow[i] = 0xFFFFFFFF; | |
1678 | } | |
1679 | ||
1680 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1681 | j = 0; |
2722971c DM |
1682 | xt_compat_lock(AF_INET); |
1683 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
1684 | xt_entry_foreach(iter0, entry0, total_size) { |
1685 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1686 | entry0, |
1687 | entry0 + total_size, | |
1688 | hook_entries, | |
1689 | underflows, | |
1690 | name); | |
72b2b1dd | 1691 | if (ret != 0) |
0559518b JE |
1692 | goto out_unlock; |
1693 | ++j; | |
72b2b1dd | 1694 | } |
2722971c DM |
1695 | |
1696 | ret = -EINVAL; | |
920b868a | 1697 | if (j != number) { |
2722971c | 1698 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1699 | j, number); |
2722971c DM |
1700 | goto out_unlock; |
1701 | } | |
1702 | ||
1703 | /* Check hooks all assigned */ | |
6e23ae2a | 1704 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1705 | /* Only hooks which are valid */ |
1706 | if (!(valid_hooks & (1 << i))) | |
1707 | continue; | |
1708 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1709 | duprintf("Invalid hook entry %u %u\n", | |
1710 | i, hook_entries[i]); | |
1711 | goto out_unlock; | |
1da177e4 | 1712 | } |
2722971c DM |
1713 | if (info->underflow[i] == 0xFFFFFFFF) { |
1714 | duprintf("Invalid underflow %u %u\n", | |
1715 | i, underflows[i]); | |
1716 | goto out_unlock; | |
1717 | } | |
1718 | } | |
1719 | ||
1720 | ret = -ENOMEM; | |
1721 | newinfo = xt_alloc_table_info(size); | |
1722 | if (!newinfo) | |
1723 | goto out_unlock; | |
1724 | ||
1725 | newinfo->number = number; | |
6e23ae2a | 1726 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1727 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1728 | newinfo->underflow[i] = info->underflow[i]; | |
1729 | } | |
1730 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1731 | pos = entry1; | |
4b478248 | 1732 | size = total_size; |
72b2b1dd | 1733 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1734 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1735 | name, newinfo, entry1); | |
72b2b1dd JE |
1736 | if (ret != 0) |
1737 | break; | |
1738 | } | |
b386d9f5 | 1739 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1740 | xt_compat_unlock(AF_INET); |
1741 | if (ret) | |
1742 | goto free_newinfo; | |
1743 | ||
1744 | ret = -ELOOP; | |
1745 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1746 | goto free_newinfo; | |
1747 | ||
4c1b52bc | 1748 | i = 0; |
72b2b1dd | 1749 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1750 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1751 | if (ret != 0) |
1752 | break; | |
0559518b | 1753 | ++i; |
cca77b7c FW |
1754 | if (strcmp(ipt_get_target(iter1)->u.user.name, |
1755 | XT_ERROR_TARGET) == 0) | |
1756 | ++newinfo->stacksize; | |
72b2b1dd | 1757 | } |
4c1b52bc | 1758 | if (ret) { |
72b2b1dd JE |
1759 | /* |
1760 | * The first i matches need cleanup_entry (calls ->destroy) | |
1761 | * because they had called ->check already. The other j-i | |
1762 | * entries need only release. | |
1763 | */ | |
1764 | int skip = i; | |
4c1b52bc | 1765 | j -= i; |
72b2b1dd JE |
1766 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1767 | if (skip-- > 0) | |
1768 | continue; | |
0559518b | 1769 | if (j-- == 0) |
72b2b1dd | 1770 | break; |
0559518b | 1771 | compat_release_entry(iter0); |
72b2b1dd | 1772 | } |
0559518b JE |
1773 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1774 | if (i-- == 0) | |
72b2b1dd | 1775 | break; |
0559518b JE |
1776 | cleanup_entry(iter1, net); |
1777 | } | |
4c1b52bc DM |
1778 | xt_free_table_info(newinfo); |
1779 | return ret; | |
1780 | } | |
f6677f43 | 1781 | |
2722971c | 1782 | /* And one copy for every other CPU */ |
fb1bb34d | 1783 | for_each_possible_cpu(i) |
2722971c DM |
1784 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1785 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1786 | ||
1787 | *pinfo = newinfo; | |
1788 | *pentry0 = entry1; | |
1789 | xt_free_table_info(info); | |
1790 | return 0; | |
1da177e4 | 1791 | |
2722971c DM |
1792 | free_newinfo: |
1793 | xt_free_table_info(newinfo); | |
1794 | out: | |
0559518b JE |
1795 | xt_entry_foreach(iter0, entry0, total_size) { |
1796 | if (j-- == 0) | |
72b2b1dd | 1797 | break; |
0559518b JE |
1798 | compat_release_entry(iter0); |
1799 | } | |
1da177e4 | 1800 | return ret; |
2722971c | 1801 | out_unlock: |
b386d9f5 | 1802 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1803 | xt_compat_unlock(AF_INET); |
1804 | goto out; | |
1da177e4 LT |
1805 | } |
1806 | ||
1807 | static int | |
34bd137b | 1808 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1809 | { |
1810 | int ret; | |
2722971c DM |
1811 | struct compat_ipt_replace tmp; |
1812 | struct xt_table_info *newinfo; | |
1813 | void *loc_cpu_entry; | |
72b2b1dd | 1814 | struct ipt_entry *iter; |
1da177e4 LT |
1815 | |
1816 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1817 | return -EFAULT; | |
1818 | ||
ee4bb818 | 1819 | /* overflow check */ |
259d4e41 | 1820 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1821 | return -ENOMEM; |
1822 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1823 | return -ENOMEM; | |
1824 | ||
2e4e6a17 | 1825 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1826 | if (!newinfo) |
1827 | return -ENOMEM; | |
1828 | ||
9c547959 | 1829 | /* choose the copy that is on our node/cpu */ |
31836064 ED |
1830 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1831 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1832 | tmp.size) != 0) { |
1833 | ret = -EFAULT; | |
1834 | goto free_newinfo; | |
1835 | } | |
1836 | ||
a83d8e8d | 1837 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
4b478248 PM |
1838 | &newinfo, &loc_cpu_entry, tmp.size, |
1839 | tmp.num_entries, tmp.hook_entry, | |
1840 | tmp.underflow); | |
2722971c | 1841 | if (ret != 0) |
1da177e4 | 1842 | goto free_newinfo; |
1da177e4 | 1843 | |
2722971c | 1844 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1845 | |
34bd137b | 1846 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1847 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1848 | if (ret) |
1849 | goto free_newinfo_untrans; | |
1850 | return 0; | |
1da177e4 | 1851 | |
2722971c | 1852 | free_newinfo_untrans: |
72b2b1dd | 1853 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1854 | cleanup_entry(iter, net); |
2722971c DM |
1855 | free_newinfo: |
1856 | xt_free_table_info(newinfo); | |
1857 | return ret; | |
1858 | } | |
1da177e4 | 1859 | |
2722971c DM |
1860 | static int |
1861 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1862 | unsigned int len) |
2722971c DM |
1863 | { |
1864 | int ret; | |
1da177e4 | 1865 | |
2722971c DM |
1866 | if (!capable(CAP_NET_ADMIN)) |
1867 | return -EPERM; | |
1da177e4 | 1868 | |
2722971c DM |
1869 | switch (cmd) { |
1870 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1871 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1872 | break; |
1da177e4 | 1873 | |
2722971c | 1874 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1875 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1876 | break; |
1877 | ||
1878 | default: | |
1879 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1880 | ret = -EINVAL; | |
1881 | } | |
1da177e4 | 1882 | |
1da177e4 LT |
1883 | return ret; |
1884 | } | |
1885 | ||
4b478248 | 1886 | struct compat_ipt_get_entries { |
2722971c DM |
1887 | char name[IPT_TABLE_MAXNAMELEN]; |
1888 | compat_uint_t size; | |
1889 | struct compat_ipt_entry entrytable[0]; | |
1890 | }; | |
1da177e4 | 1891 | |
4b478248 PM |
1892 | static int |
1893 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1894 | void __user *userptr) | |
2722971c | 1895 | { |
2722971c | 1896 | struct xt_counters *counters; |
5452e425 | 1897 | const struct xt_table_info *private = table->private; |
2722971c DM |
1898 | void __user *pos; |
1899 | unsigned int size; | |
1900 | int ret = 0; | |
5452e425 | 1901 | const void *loc_cpu_entry; |
a18aa31b | 1902 | unsigned int i = 0; |
72b2b1dd | 1903 | struct ipt_entry *iter; |
1da177e4 | 1904 | |
2722971c DM |
1905 | counters = alloc_counters(table); |
1906 | if (IS_ERR(counters)) | |
1907 | return PTR_ERR(counters); | |
1908 | ||
1909 | /* choose the copy that is on our node/cpu, ... | |
1910 | * This choice is lazy (because current thread is | |
1911 | * allowed to migrate to another cpu) | |
1912 | */ | |
1913 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1914 | pos = userptr; | |
1915 | size = total_size; | |
72b2b1dd JE |
1916 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1917 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1918 | &size, counters, i++); |
72b2b1dd JE |
1919 | if (ret != 0) |
1920 | break; | |
1921 | } | |
2722971c | 1922 | |
2722971c DM |
1923 | vfree(counters); |
1924 | return ret; | |
1da177e4 LT |
1925 | } |
1926 | ||
1927 | static int | |
34bd137b AD |
1928 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1929 | int *len) | |
1da177e4 | 1930 | { |
2722971c DM |
1931 | int ret; |
1932 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1933 | struct xt_table *t; |
1da177e4 | 1934 | |
2722971c | 1935 | if (*len < sizeof(get)) { |
c9d8fe13 | 1936 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1937 | return -EINVAL; |
2722971c | 1938 | } |
1da177e4 | 1939 | |
2722971c DM |
1940 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1941 | return -EFAULT; | |
1da177e4 | 1942 | |
2722971c | 1943 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1944 | duprintf("compat_get_entries: %u != %zu\n", |
1945 | *len, sizeof(get) + get.size); | |
2722971c | 1946 | return -EINVAL; |
1da177e4 LT |
1947 | } |
1948 | ||
2722971c | 1949 | xt_compat_lock(AF_INET); |
34bd137b | 1950 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1951 | if (t && !IS_ERR(t)) { |
5452e425 | 1952 | const struct xt_table_info *private = t->private; |
2722971c | 1953 | struct xt_table_info info; |
9c547959 | 1954 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1955 | ret = compat_table_info(private, &info); |
1956 | if (!ret && get.size == info.size) { | |
1957 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 1958 | t, uptr->entrytable); |
2722971c DM |
1959 | } else if (!ret) { |
1960 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1961 | private->size, get.size); |
544473c1 | 1962 | ret = -EAGAIN; |
2722971c | 1963 | } |
b386d9f5 | 1964 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1965 | module_put(t->me); |
1966 | xt_table_unlock(t); | |
1967 | } else | |
1da177e4 | 1968 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1969 | |
2722971c DM |
1970 | xt_compat_unlock(AF_INET); |
1971 | return ret; | |
1972 | } | |
1da177e4 | 1973 | |
79030ed0 PM |
1974 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1975 | ||
2722971c DM |
1976 | static int |
1977 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1978 | { | |
1979 | int ret; | |
1da177e4 | 1980 | |
82fac054 BS |
1981 | if (!capable(CAP_NET_ADMIN)) |
1982 | return -EPERM; | |
1983 | ||
2722971c DM |
1984 | switch (cmd) { |
1985 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1986 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1987 | break; |
1988 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1989 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1990 | break; |
1991 | default: | |
79030ed0 | 1992 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1993 | } |
1da177e4 LT |
1994 | return ret; |
1995 | } | |
2722971c | 1996 | #endif |
1da177e4 LT |
1997 | |
1998 | static int | |
9c547959 | 1999 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
2000 | { |
2001 | int ret; | |
2002 | ||
2003 | if (!capable(CAP_NET_ADMIN)) | |
2004 | return -EPERM; | |
2005 | ||
2006 | switch (cmd) { | |
2007 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 2008 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2009 | break; |
2010 | ||
2011 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2012 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2013 | break; |
2014 | ||
2015 | default: | |
2016 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
2017 | ret = -EINVAL; | |
2018 | } | |
2019 | ||
2020 | return ret; | |
2021 | } | |
2022 | ||
2023 | static int | |
2024 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2025 | { | |
2026 | int ret; | |
2027 | ||
2028 | if (!capable(CAP_NET_ADMIN)) | |
2029 | return -EPERM; | |
2030 | ||
2031 | switch (cmd) { | |
2722971c | 2032 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2033 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2034 | break; |
1da177e4 | 2035 | |
2722971c | 2036 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2037 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2038 | break; |
1da177e4 LT |
2039 | |
2040 | case IPT_SO_GET_REVISION_MATCH: | |
2041 | case IPT_SO_GET_REVISION_TARGET: { | |
2042 | struct ipt_get_revision rev; | |
2e4e6a17 | 2043 | int target; |
1da177e4 LT |
2044 | |
2045 | if (*len != sizeof(rev)) { | |
2046 | ret = -EINVAL; | |
2047 | break; | |
2048 | } | |
2049 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2050 | ret = -EFAULT; | |
2051 | break; | |
2052 | } | |
2053 | ||
2054 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2055 | target = 1; |
1da177e4 | 2056 | else |
2e4e6a17 | 2057 | target = 0; |
1da177e4 | 2058 | |
2e4e6a17 HW |
2059 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2060 | rev.revision, | |
2061 | target, &ret), | |
1da177e4 LT |
2062 | "ipt_%s", rev.name); |
2063 | break; | |
2064 | } | |
2065 | ||
2066 | default: | |
2067 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2068 | ret = -EINVAL; | |
2069 | } | |
2070 | ||
2071 | return ret; | |
2072 | } | |
2073 | ||
35aad0ff JE |
2074 | struct xt_table *ipt_register_table(struct net *net, |
2075 | const struct xt_table *table, | |
44d34e72 | 2076 | const struct ipt_replace *repl) |
1da177e4 LT |
2077 | { |
2078 | int ret; | |
2e4e6a17 | 2079 | struct xt_table_info *newinfo; |
f3c5c1bf | 2080 | struct xt_table_info bootstrap = {0}; |
31836064 | 2081 | void *loc_cpu_entry; |
a98da11d | 2082 | struct xt_table *new_table; |
1da177e4 | 2083 | |
2e4e6a17 | 2084 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2085 | if (!newinfo) { |
2086 | ret = -ENOMEM; | |
2087 | goto out; | |
2088 | } | |
1da177e4 | 2089 | |
9c547959 | 2090 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2091 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2092 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2093 | |
0f234214 | 2094 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2095 | if (ret != 0) |
2096 | goto out_free; | |
1da177e4 | 2097 | |
44d34e72 | 2098 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2099 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2100 | ret = PTR_ERR(new_table); |
2101 | goto out_free; | |
1da177e4 LT |
2102 | } |
2103 | ||
44d34e72 AD |
2104 | return new_table; |
2105 | ||
2106 | out_free: | |
2107 | xt_free_table_info(newinfo); | |
2108 | out: | |
2109 | return ERR_PTR(ret); | |
1da177e4 LT |
2110 | } |
2111 | ||
f54e9367 | 2112 | void ipt_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2113 | { |
2e4e6a17 | 2114 | struct xt_table_info *private; |
31836064 | 2115 | void *loc_cpu_entry; |
df200969 | 2116 | struct module *table_owner = table->me; |
72b2b1dd | 2117 | struct ipt_entry *iter; |
31836064 | 2118 | |
e905a9ed | 2119 | private = xt_unregister_table(table); |
1da177e4 LT |
2120 | |
2121 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2122 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2123 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2124 | cleanup_entry(iter, net); |
df200969 AD |
2125 | if (private->number > private->initial_entries) |
2126 | module_put(table_owner); | |
2e4e6a17 | 2127 | xt_free_table_info(private); |
1da177e4 LT |
2128 | } |
2129 | ||
2130 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2131 | static inline bool |
1da177e4 LT |
2132 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2133 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2134 | bool invert) |
1da177e4 | 2135 | { |
9c547959 PM |
2136 | return ((test_type == 0xFF) || |
2137 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2138 | ^ invert; |
2139 | } | |
2140 | ||
1d93a9cb | 2141 | static bool |
62fc8051 | 2142 | icmp_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2143 | { |
5452e425 JE |
2144 | const struct icmphdr *ic; |
2145 | struct icmphdr _icmph; | |
f7108a20 | 2146 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2147 | |
2148 | /* Must not be a fragment. */ | |
f7108a20 | 2149 | if (par->fragoff != 0) |
1d93a9cb | 2150 | return false; |
1da177e4 | 2151 | |
f7108a20 | 2152 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2153 | if (ic == NULL) { |
2154 | /* We've been asked to examine this packet, and we | |
2155 | * can't. Hence, no choice but to drop. | |
2156 | */ | |
2157 | duprintf("Dropping evil ICMP tinygram.\n"); | |
b4ba2611 | 2158 | par->hotdrop = true; |
1d93a9cb | 2159 | return false; |
1da177e4 LT |
2160 | } |
2161 | ||
2162 | return icmp_type_code_match(icmpinfo->type, | |
2163 | icmpinfo->code[0], | |
2164 | icmpinfo->code[1], | |
2165 | ic->type, ic->code, | |
2166 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2167 | } | |
2168 | ||
b0f38452 | 2169 | static int icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2170 | { |
9b4fce7a | 2171 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2172 | |
1d5cd909 | 2173 | /* Must specify no unknown invflags */ |
bd414ee6 | 2174 | return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2175 | } |
2176 | ||
4538506b JE |
2177 | static struct xt_target ipt_builtin_tg[] __read_mostly = { |
2178 | { | |
2179 | .name = IPT_STANDARD_TARGET, | |
2180 | .targetsize = sizeof(int), | |
2181 | .family = NFPROTO_IPV4, | |
2722971c | 2182 | #ifdef CONFIG_COMPAT |
4538506b JE |
2183 | .compatsize = sizeof(compat_int_t), |
2184 | .compat_from_user = compat_standard_from_user, | |
2185 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2186 | #endif |
4538506b JE |
2187 | }, |
2188 | { | |
2189 | .name = IPT_ERROR_TARGET, | |
2190 | .target = ipt_error, | |
2191 | .targetsize = IPT_FUNCTION_MAXNAMELEN, | |
2192 | .family = NFPROTO_IPV4, | |
2193 | }, | |
1da177e4 LT |
2194 | }; |
2195 | ||
2196 | static struct nf_sockopt_ops ipt_sockopts = { | |
2197 | .pf = PF_INET, | |
2198 | .set_optmin = IPT_BASE_CTL, | |
2199 | .set_optmax = IPT_SO_SET_MAX+1, | |
2200 | .set = do_ipt_set_ctl, | |
2722971c DM |
2201 | #ifdef CONFIG_COMPAT |
2202 | .compat_set = compat_do_ipt_set_ctl, | |
2203 | #endif | |
1da177e4 LT |
2204 | .get_optmin = IPT_BASE_CTL, |
2205 | .get_optmax = IPT_SO_GET_MAX+1, | |
2206 | .get = do_ipt_get_ctl, | |
2722971c DM |
2207 | #ifdef CONFIG_COMPAT |
2208 | .compat_get = compat_do_ipt_get_ctl, | |
2209 | #endif | |
16fcec35 | 2210 | .owner = THIS_MODULE, |
1da177e4 LT |
2211 | }; |
2212 | ||
4538506b JE |
2213 | static struct xt_match ipt_builtin_mt[] __read_mostly = { |
2214 | { | |
2215 | .name = "icmp", | |
2216 | .match = icmp_match, | |
2217 | .matchsize = sizeof(struct ipt_icmp), | |
2218 | .checkentry = icmp_checkentry, | |
2219 | .proto = IPPROTO_ICMP, | |
2220 | .family = NFPROTO_IPV4, | |
2221 | }, | |
1da177e4 LT |
2222 | }; |
2223 | ||
3cb609d5 AD |
2224 | static int __net_init ip_tables_net_init(struct net *net) |
2225 | { | |
383ca5b8 | 2226 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
2227 | } |
2228 | ||
2229 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2230 | { | |
383ca5b8 | 2231 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
2232 | } |
2233 | ||
2234 | static struct pernet_operations ip_tables_net_ops = { | |
2235 | .init = ip_tables_net_init, | |
2236 | .exit = ip_tables_net_exit, | |
2237 | }; | |
2238 | ||
65b4b4e8 | 2239 | static int __init ip_tables_init(void) |
1da177e4 LT |
2240 | { |
2241 | int ret; | |
2242 | ||
3cb609d5 | 2243 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2244 | if (ret < 0) |
2245 | goto err1; | |
2e4e6a17 | 2246 | |
1da177e4 | 2247 | /* Noone else will be downing sem now, so we won't sleep */ |
4538506b | 2248 | ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 PM |
2249 | if (ret < 0) |
2250 | goto err2; | |
4538506b | 2251 | ret = xt_register_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 PM |
2252 | if (ret < 0) |
2253 | goto err4; | |
1da177e4 LT |
2254 | |
2255 | /* Register setsockopt */ | |
2256 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2257 | if (ret < 0) |
2258 | goto err5; | |
1da177e4 | 2259 | |
ff67e4e4 | 2260 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2261 | return 0; |
0eff66e6 PM |
2262 | |
2263 | err5: | |
4538506b | 2264 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 | 2265 | err4: |
4538506b | 2266 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 | 2267 | err2: |
3cb609d5 | 2268 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2269 | err1: |
2270 | return ret; | |
1da177e4 LT |
2271 | } |
2272 | ||
65b4b4e8 | 2273 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2274 | { |
2275 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2276 | |
4538506b JE |
2277 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
2278 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); | |
3cb609d5 | 2279 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2280 | } |
2281 | ||
2282 | EXPORT_SYMBOL(ipt_register_table); | |
2283 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2284 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2285 | module_init(ip_tables_init); |
2286 | module_exit(ip_tables_fini); |