Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Packet matching code. | |
3 | * | |
4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
2e4e6a17 | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
f229f6ce | 6 | * Copyright (C) 2006-2010 Patrick McHardy <kaber@trash.net> |
1da177e4 LT |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
1da177e4 | 11 | */ |
90e7d4ab | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
1da177e4 | 13 | #include <linux/cache.h> |
4fc268d2 | 14 | #include <linux/capability.h> |
1da177e4 LT |
15 | #include <linux/skbuff.h> |
16 | #include <linux/kmod.h> | |
17 | #include <linux/vmalloc.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/module.h> | |
1da177e4 LT |
20 | #include <linux/icmp.h> |
21 | #include <net/ip.h> | |
2722971c | 22 | #include <net/compat.h> |
1da177e4 | 23 | #include <asm/uaccess.h> |
57b47a53 | 24 | #include <linux/mutex.h> |
1da177e4 LT |
25 | #include <linux/proc_fs.h> |
26 | #include <linux/err.h> | |
c8923c6b | 27 | #include <linux/cpumask.h> |
1da177e4 | 28 | |
2e4e6a17 | 29 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 30 | #include <linux/netfilter_ipv4/ip_tables.h> |
f01ffbd6 | 31 | #include <net/netfilter/nf_log.h> |
e3eaa991 | 32 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
33 | |
34 | MODULE_LICENSE("GPL"); | |
35 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
36 | MODULE_DESCRIPTION("IPv4 packet filter"); | |
37 | ||
38 | /*#define DEBUG_IP_FIREWALL*/ | |
39 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
40 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
41 | ||
42 | #ifdef DEBUG_IP_FIREWALL | |
ff67e4e4 | 43 | #define dprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
44 | #else |
45 | #define dprintf(format, args...) | |
46 | #endif | |
47 | ||
48 | #ifdef DEBUG_IP_FIREWALL_USER | |
ff67e4e4 | 49 | #define duprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
50 | #else |
51 | #define duprintf(format, args...) | |
52 | #endif | |
53 | ||
54 | #ifdef CONFIG_NETFILTER_DEBUG | |
af567603 | 55 | #define IP_NF_ASSERT(x) WARN_ON(!(x)) |
1da177e4 LT |
56 | #else |
57 | #define IP_NF_ASSERT(x) | |
58 | #endif | |
1da177e4 LT |
59 | |
60 | #if 0 | |
61 | /* All the better to debug you with... */ | |
62 | #define static | |
63 | #define inline | |
64 | #endif | |
65 | ||
e3eaa991 JE |
66 | void *ipt_alloc_initial_table(const struct xt_table *info) |
67 | { | |
68 | return xt_alloc_initial_table(ipt, IPT); | |
69 | } | |
70 | EXPORT_SYMBOL_GPL(ipt_alloc_initial_table); | |
71 | ||
1da177e4 | 72 | /* Returns whether matches rule or not. */ |
022748a9 | 73 | /* Performance critical - called for every packet */ |
9c547959 | 74 | static inline bool |
1da177e4 LT |
75 | ip_packet_match(const struct iphdr *ip, |
76 | const char *indev, | |
77 | const char *outdev, | |
78 | const struct ipt_ip *ipinfo, | |
79 | int isfrag) | |
80 | { | |
1da177e4 LT |
81 | unsigned long ret; |
82 | ||
e79ec50b | 83 | #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) |
1da177e4 LT |
84 | |
85 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, | |
3666ed1c JP |
86 | IPT_INV_SRCIP) || |
87 | FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, | |
88 | IPT_INV_DSTIP)) { | |
1da177e4 LT |
89 | dprintf("Source or dest mismatch.\n"); |
90 | ||
cffee385 HH |
91 | dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n", |
92 | &ip->saddr, &ipinfo->smsk.s_addr, &ipinfo->src.s_addr, | |
1da177e4 | 93 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); |
cffee385 HH |
94 | dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n", |
95 | &ip->daddr, &ipinfo->dmsk.s_addr, &ipinfo->dst.s_addr, | |
1da177e4 | 96 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); |
9c547959 | 97 | return false; |
1da177e4 LT |
98 | } |
99 | ||
b8dfe498 | 100 | ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask); |
1da177e4 LT |
101 | |
102 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { | |
103 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
104 | indev, ipinfo->iniface, | |
105 | ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":""); | |
9c547959 | 106 | return false; |
1da177e4 LT |
107 | } |
108 | ||
b8dfe498 | 109 | ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
1da177e4 LT |
110 | |
111 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { | |
112 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
113 | outdev, ipinfo->outiface, | |
114 | ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":""); | |
9c547959 | 115 | return false; |
1da177e4 LT |
116 | } |
117 | ||
118 | /* Check specific protocol */ | |
3666ed1c JP |
119 | if (ipinfo->proto && |
120 | FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { | |
1da177e4 LT |
121 | dprintf("Packet protocol %hi does not match %hi.%s\n", |
122 | ip->protocol, ipinfo->proto, | |
123 | ipinfo->invflags&IPT_INV_PROTO ? " (INV)":""); | |
9c547959 | 124 | return false; |
1da177e4 LT |
125 | } |
126 | ||
127 | /* If we have a fragment rule but the packet is not a fragment | |
128 | * then we return zero */ | |
129 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { | |
130 | dprintf("Fragment rule but not fragment.%s\n", | |
131 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); | |
9c547959 | 132 | return false; |
1da177e4 LT |
133 | } |
134 | ||
9c547959 | 135 | return true; |
1da177e4 LT |
136 | } |
137 | ||
022748a9 | 138 | static bool |
1da177e4 LT |
139 | ip_checkentry(const struct ipt_ip *ip) |
140 | { | |
141 | if (ip->flags & ~IPT_F_MASK) { | |
142 | duprintf("Unknown flag bits set: %08X\n", | |
143 | ip->flags & ~IPT_F_MASK); | |
ccb79bdc | 144 | return false; |
1da177e4 LT |
145 | } |
146 | if (ip->invflags & ~IPT_INV_MASK) { | |
147 | duprintf("Unknown invflag bits set: %08X\n", | |
148 | ip->invflags & ~IPT_INV_MASK); | |
ccb79bdc | 149 | return false; |
1da177e4 | 150 | } |
ccb79bdc | 151 | return true; |
1da177e4 LT |
152 | } |
153 | ||
154 | static unsigned int | |
4b560b44 | 155 | ipt_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 156 | { |
e87cc472 | 157 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
158 | |
159 | return NF_DROP; | |
160 | } | |
161 | ||
022748a9 | 162 | /* Performance critical */ |
1da177e4 | 163 | static inline struct ipt_entry * |
d5d1baa1 | 164 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
165 | { |
166 | return (struct ipt_entry *)(base + offset); | |
167 | } | |
168 | ||
ba9dda3a | 169 | /* All zeroes == unconditional rule. */ |
022748a9 | 170 | /* Mildly perf critical (only if packet tracing is on) */ |
4b9e9796 | 171 | static inline bool unconditional(const struct ipt_entry *e) |
ba9dda3a | 172 | { |
47901dc2 | 173 | static const struct ipt_ip uncond; |
ba9dda3a | 174 | |
4b9e9796 S |
175 | return e->target_offset == sizeof(struct ipt_entry) && |
176 | memcmp(&e->ip, &uncond, sizeof(uncond)) == 0; | |
e79ec50b | 177 | #undef FWINV |
ba9dda3a JK |
178 | } |
179 | ||
d5d1baa1 | 180 | /* for const-correctness */ |
87a2e70d | 181 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
182 | ipt_get_target_c(const struct ipt_entry *e) |
183 | { | |
184 | return ipt_get_target((struct ipt_entry *)e); | |
185 | } | |
186 | ||
f0165888 | 187 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
022748a9 | 188 | static const char *const hooknames[] = { |
6e23ae2a PM |
189 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
190 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 191 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
192 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
193 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
194 | }; |
195 | ||
196 | enum nf_ip_trace_comments { | |
197 | NF_IP_TRACE_COMMENT_RULE, | |
198 | NF_IP_TRACE_COMMENT_RETURN, | |
199 | NF_IP_TRACE_COMMENT_POLICY, | |
200 | }; | |
201 | ||
022748a9 | 202 | static const char *const comments[] = { |
ba9dda3a JK |
203 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
204 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
205 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
206 | }; | |
207 | ||
208 | static struct nf_loginfo trace_loginfo = { | |
209 | .type = NF_LOG_TYPE_LOG, | |
210 | .u = { | |
211 | .log = { | |
212 | .level = 4, | |
213 | .logflags = NF_LOG_MASK, | |
214 | }, | |
215 | }, | |
216 | }; | |
217 | ||
022748a9 | 218 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 219 | static inline int |
d5d1baa1 | 220 | get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e, |
4f2f6f23 JE |
221 | const char *hookname, const char **chainname, |
222 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 223 | { |
87a2e70d | 224 | const struct xt_standard_target *t = (void *)ipt_get_target_c(s); |
ba9dda3a | 225 | |
243bf6e2 | 226 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
227 | /* Head of user chain: ERROR target with chainname */ |
228 | *chainname = t->target.data; | |
229 | (*rulenum) = 0; | |
230 | } else if (s == e) { | |
231 | (*rulenum)++; | |
232 | ||
4b9e9796 | 233 | if (unconditional(s) && |
3666ed1c | 234 | strcmp(t->target.u.kernel.target->name, |
243bf6e2 | 235 | XT_STANDARD_TARGET) == 0 && |
4b9e9796 | 236 | t->verdict < 0) { |
ba9dda3a JK |
237 | /* Tail of chains: STANDARD target (return/policy) */ |
238 | *comment = *chainname == hookname | |
4f2f6f23 JE |
239 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
240 | : comments[NF_IP_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
241 | } |
242 | return 1; | |
243 | } else | |
244 | (*rulenum)++; | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
d5d1baa1 | 249 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
250 | unsigned int hook, |
251 | const struct net_device *in, | |
252 | const struct net_device *out, | |
ecb6f85e | 253 | const char *tablename, |
d5d1baa1 JE |
254 | const struct xt_table_info *private, |
255 | const struct ipt_entry *e) | |
ba9dda3a | 256 | { |
d5d1baa1 | 257 | const void *table_base; |
5452e425 | 258 | const struct ipt_entry *root; |
4f2f6f23 | 259 | const char *hookname, *chainname, *comment; |
72b2b1dd | 260 | const struct ipt_entry *iter; |
ba9dda3a | 261 | unsigned int rulenum = 0; |
30e0c6a6 | 262 | struct net *net = dev_net(in ? in : out); |
ba9dda3a | 263 | |
ccf5bd8c | 264 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
265 | root = get_entry(table_base, private->hook_entry[hook]); |
266 | ||
4f2f6f23 JE |
267 | hookname = chainname = hooknames[hook]; |
268 | comment = comments[NF_IP_TRACE_COMMENT_RULE]; | |
ba9dda3a | 269 | |
72b2b1dd JE |
270 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
271 | if (get_chainname_rulenum(iter, e, hookname, | |
272 | &chainname, &comment, &rulenum) != 0) | |
273 | break; | |
ba9dda3a | 274 | |
30e0c6a6 | 275 | nf_log_packet(net, AF_INET, hook, skb, in, out, &trace_loginfo, |
ba9dda3a JK |
276 | "TRACE: %s:%s:%s:%u ", |
277 | tablename, chainname, comment, rulenum); | |
278 | } | |
279 | #endif | |
280 | ||
98e86403 JE |
281 | static inline __pure |
282 | struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry) | |
283 | { | |
284 | return (void *)entry + entry->next_offset; | |
285 | } | |
286 | ||
1da177e4 LT |
287 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
288 | unsigned int | |
3db05fea | 289 | ipt_do_table(struct sk_buff *skb, |
1da177e4 LT |
290 | unsigned int hook, |
291 | const struct net_device *in, | |
292 | const struct net_device *out, | |
e60a13e0 | 293 | struct xt_table *table) |
1da177e4 LT |
294 | { |
295 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); | |
5452e425 | 296 | const struct iphdr *ip; |
1da177e4 LT |
297 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
298 | unsigned int verdict = NF_DROP; | |
299 | const char *indev, *outdev; | |
d5d1baa1 | 300 | const void *table_base; |
f3c5c1bf JE |
301 | struct ipt_entry *e, **jumpstack; |
302 | unsigned int *stackptr, origptr, cpu; | |
d5d1baa1 | 303 | const struct xt_table_info *private; |
de74c169 | 304 | struct xt_action_param acpar; |
7f5c6d4f | 305 | unsigned int addend; |
1da177e4 LT |
306 | |
307 | /* Initialization */ | |
3db05fea | 308 | ip = ip_hdr(skb); |
1da177e4 LT |
309 | indev = in ? in->name : nulldevname; |
310 | outdev = out ? out->name : nulldevname; | |
311 | /* We handle fragments by dealing with the first fragment as | |
312 | * if it was a normal packet. All other fragments are treated | |
313 | * normally, except that they will NEVER match rules that ask | |
314 | * things we don't know, ie. tcp syn flag or ports). If the | |
315 | * rule is also a fragment-specific rule, non-fragments won't | |
316 | * match it. */ | |
de74c169 JE |
317 | acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
318 | acpar.thoff = ip_hdrlen(skb); | |
b4ba2611 | 319 | acpar.hotdrop = false; |
de74c169 JE |
320 | acpar.in = in; |
321 | acpar.out = out; | |
322 | acpar.family = NFPROTO_IPV4; | |
323 | acpar.hooknum = hook; | |
1da177e4 | 324 | |
1da177e4 | 325 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
7f5c6d4f ED |
326 | local_bh_disable(); |
327 | addend = xt_write_recseq_begin(); | |
942e4a2b | 328 | private = table->private; |
f3c5c1bf JE |
329 | cpu = smp_processor_id(); |
330 | table_base = private->entries[cpu]; | |
331 | jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; | |
7489aec8 | 332 | stackptr = per_cpu_ptr(private->stackptr, cpu); |
f3c5c1bf | 333 | origptr = *stackptr; |
78454473 | 334 | |
2e4e6a17 | 335 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 336 | |
cecc74de | 337 | pr_debug("Entering %s(hook %u); sp at %u (UF %p)\n", |
f3c5c1bf JE |
338 | table->name, hook, origptr, |
339 | get_entry(table_base, private->underflow[hook])); | |
1da177e4 LT |
340 | |
341 | do { | |
87a2e70d | 342 | const struct xt_entry_target *t; |
dcea992a | 343 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 344 | |
1da177e4 | 345 | IP_NF_ASSERT(e); |
a1ff4ac8 | 346 | if (!ip_packet_match(ip, indev, outdev, |
de74c169 | 347 | &e->ip, acpar.fragoff)) { |
dcea992a | 348 | no_match: |
a1ff4ac8 JE |
349 | e = ipt_next_entry(e); |
350 | continue; | |
351 | } | |
1da177e4 | 352 | |
ef53d702 | 353 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
354 | acpar.match = ematch->u.kernel.match; |
355 | acpar.matchinfo = ematch->data; | |
356 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 357 | goto no_match; |
ef53d702 | 358 | } |
dcea992a | 359 | |
7df0884c | 360 | ADD_COUNTER(e->counters, skb->len, 1); |
1da177e4 | 361 | |
a1ff4ac8 JE |
362 | t = ipt_get_target(e); |
363 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a | 364 | |
f0165888 | 365 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
366 | /* The packet is traced: log it */ |
367 | if (unlikely(skb->nf_trace)) | |
368 | trace_packet(skb, hook, in, out, | |
369 | table->name, private, e); | |
ba9dda3a | 370 | #endif |
a1ff4ac8 JE |
371 | /* Standard target? */ |
372 | if (!t->u.kernel.target->target) { | |
373 | int v; | |
374 | ||
87a2e70d | 375 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
376 | if (v < 0) { |
377 | /* Pop from stack? */ | |
243bf6e2 | 378 | if (v != XT_RETURN) { |
95c96174 | 379 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 380 | break; |
1da177e4 | 381 | } |
db856674 | 382 | if (*stackptr <= origptr) { |
f3c5c1bf JE |
383 | e = get_entry(table_base, |
384 | private->underflow[hook]); | |
cecc74de | 385 | pr_debug("Underflow (this is normal) " |
f3c5c1bf JE |
386 | "to %p\n", e); |
387 | } else { | |
388 | e = jumpstack[--*stackptr]; | |
cecc74de | 389 | pr_debug("Pulled %p out from pos %u\n", |
f3c5c1bf JE |
390 | e, *stackptr); |
391 | e = ipt_next_entry(e); | |
392 | } | |
a1ff4ac8 JE |
393 | continue; |
394 | } | |
3666ed1c JP |
395 | if (table_base + v != ipt_next_entry(e) && |
396 | !(e->ip.flags & IPT_F_GOTO)) { | |
f3c5c1bf JE |
397 | if (*stackptr >= private->stacksize) { |
398 | verdict = NF_DROP; | |
399 | break; | |
400 | } | |
401 | jumpstack[(*stackptr)++] = e; | |
cecc74de | 402 | pr_debug("Pushed %p into pos %u\n", |
f3c5c1bf | 403 | e, *stackptr - 1); |
a1ff4ac8 | 404 | } |
1da177e4 | 405 | |
a1ff4ac8 | 406 | e = get_entry(table_base, v); |
7a6b1c46 JE |
407 | continue; |
408 | } | |
409 | ||
de74c169 JE |
410 | acpar.target = t->u.kernel.target; |
411 | acpar.targinfo = t->data; | |
bb70dfa5 | 412 | |
de74c169 | 413 | verdict = t->u.kernel.target->target(skb, &acpar); |
7a6b1c46 JE |
414 | /* Target might have changed stuff. */ |
415 | ip = ip_hdr(skb); | |
243bf6e2 | 416 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
417 | e = ipt_next_entry(e); |
418 | else | |
419 | /* Verdict */ | |
420 | break; | |
b4ba2611 | 421 | } while (!acpar.hotdrop); |
cecc74de | 422 | pr_debug("Exiting %s; resetting sp from %u to %u\n", |
f3c5c1bf JE |
423 | __func__, *stackptr, origptr); |
424 | *stackptr = origptr; | |
7f5c6d4f ED |
425 | xt_write_recseq_end(addend); |
426 | local_bh_enable(); | |
427 | ||
1da177e4 LT |
428 | #ifdef DEBUG_ALLOW_ALL |
429 | return NF_ACCEPT; | |
430 | #else | |
b4ba2611 | 431 | if (acpar.hotdrop) |
1da177e4 LT |
432 | return NF_DROP; |
433 | else return verdict; | |
434 | #endif | |
435 | } | |
436 | ||
1da177e4 LT |
437 | /* Figures out from what hook each rule can be called: returns 0 if |
438 | there are loops. Puts hook bitmask in comefrom. */ | |
439 | static int | |
d5d1baa1 | 440 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 441 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
442 | { |
443 | unsigned int hook; | |
444 | ||
445 | /* No recursion; use packet counter to save back ptrs (reset | |
446 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 447 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 448 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 449 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
450 | |
451 | if (!(valid_hooks & (1 << hook))) | |
452 | continue; | |
453 | ||
454 | /* Set initial back pointer. */ | |
455 | e->counters.pcnt = pos; | |
456 | ||
457 | for (;;) { | |
87a2e70d | 458 | const struct xt_standard_target *t |
d5d1baa1 | 459 | = (void *)ipt_get_target_c(e); |
e1b4b9f3 | 460 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 461 | |
6e23ae2a | 462 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
654d0fbd | 463 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
464 | hook, pos, e->comefrom); |
465 | return 0; | |
466 | } | |
9c547959 | 467 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
468 | |
469 | /* Unconditional return/END. */ | |
4b9e9796 | 470 | if ((unconditional(e) && |
3666ed1c | 471 | (strcmp(t->target.u.user.name, |
243bf6e2 | 472 | XT_STANDARD_TARGET) == 0) && |
4b9e9796 | 473 | t->verdict < 0) || 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 |
4b9e9796 | 562 | check_entry(const struct ipt_entry *e) |
a96be246 | 563 | { |
87a2e70d | 564 | const struct xt_entry_target *t; |
a96be246 | 565 | |
4b9e9796 | 566 | if (!ip_checkentry(&e->ip)) |
a96be246 | 567 | return -EINVAL; |
a96be246 | 568 | |
87a2e70d | 569 | if (e->target_offset + sizeof(struct xt_entry_target) > |
9c547959 | 570 | e->next_offset) |
a96be246 DM |
571 | return -EINVAL; |
572 | ||
d5d1baa1 | 573 | t = ipt_get_target_c(e); |
a96be246 DM |
574 | if (e->target_offset + t->u.target_size > e->next_offset) |
575 | return -EINVAL; | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
4b9e9796 | 580 | |
022748a9 | 581 | static int |
87a2e70d | 582 | check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
a96be246 | 583 | { |
9b4fce7a | 584 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 DM |
585 | int ret; |
586 | ||
9b4fce7a JE |
587 | par->match = m->u.kernel.match; |
588 | par->matchinfo = m->data; | |
589 | ||
916a917d | 590 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 591 | ip->proto, ip->invflags & IPT_INV_PROTO); |
367c6790 | 592 | if (ret < 0) { |
b5cad0df | 593 | duprintf("check failed for `%s'.\n", par->match->name); |
367c6790 | 594 | return ret; |
a96be246 | 595 | } |
367c6790 | 596 | return 0; |
a96be246 DM |
597 | } |
598 | ||
022748a9 | 599 | static int |
87a2e70d | 600 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 601 | { |
6709dbbb | 602 | struct xt_match *match; |
3cdc7c95 | 603 | int ret; |
1da177e4 | 604 | |
fd0ec0e6 JE |
605 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
606 | m->u.user.revision); | |
607 | if (IS_ERR(match)) { | |
a96be246 | 608 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 609 | return PTR_ERR(match); |
1da177e4 LT |
610 | } |
611 | m->u.kernel.match = match; | |
612 | ||
6bdb331b | 613 | ret = check_match(m, par); |
3cdc7c95 PM |
614 | if (ret) |
615 | goto err; | |
616 | ||
1da177e4 | 617 | return 0; |
3cdc7c95 PM |
618 | err: |
619 | module_put(m->u.kernel.match->me); | |
620 | return ret; | |
1da177e4 LT |
621 | } |
622 | ||
add67461 | 623 | static int check_target(struct ipt_entry *e, struct net *net, const char *name) |
a96be246 | 624 | { |
87a2e70d | 625 | struct xt_entry_target *t = ipt_get_target(e); |
af5d6dc2 | 626 | struct xt_tgchk_param par = { |
add67461 | 627 | .net = net, |
af5d6dc2 JE |
628 | .table = name, |
629 | .entryinfo = e, | |
630 | .target = t->u.kernel.target, | |
631 | .targinfo = t->data, | |
632 | .hook_mask = e->comefrom, | |
916a917d | 633 | .family = NFPROTO_IPV4, |
af5d6dc2 | 634 | }; |
e905a9ed | 635 | int ret; |
a96be246 | 636 | |
916a917d | 637 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 638 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
367c6790 | 639 | if (ret < 0) { |
ff67e4e4 | 640 | duprintf("check failed for `%s'.\n", |
a96be246 | 641 | t->u.kernel.target->name); |
367c6790 | 642 | return ret; |
a96be246 | 643 | } |
367c6790 | 644 | return 0; |
a96be246 | 645 | } |
1da177e4 | 646 | |
022748a9 | 647 | static int |
a83d8e8d | 648 | find_check_entry(struct ipt_entry *e, struct net *net, const char *name, |
0559518b | 649 | unsigned int size) |
1da177e4 | 650 | { |
87a2e70d | 651 | struct xt_entry_target *t; |
6709dbbb | 652 | struct xt_target *target; |
1da177e4 LT |
653 | int ret; |
654 | unsigned int j; | |
9b4fce7a | 655 | struct xt_mtchk_param mtpar; |
dcea992a | 656 | struct xt_entry_match *ematch; |
1da177e4 | 657 | |
1da177e4 | 658 | j = 0; |
a83d8e8d | 659 | mtpar.net = net; |
9b4fce7a JE |
660 | mtpar.table = name; |
661 | mtpar.entryinfo = &e->ip; | |
662 | mtpar.hook_mask = e->comefrom; | |
916a917d | 663 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 664 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 665 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 666 | if (ret != 0) |
6bdb331b JE |
667 | goto cleanup_matches; |
668 | ++j; | |
dcea992a | 669 | } |
1da177e4 LT |
670 | |
671 | t = ipt_get_target(e); | |
d2a7b6ba JE |
672 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
673 | t->u.user.revision); | |
674 | if (IS_ERR(target)) { | |
a96be246 | 675 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 676 | ret = PTR_ERR(target); |
1da177e4 LT |
677 | goto cleanup_matches; |
678 | } | |
679 | t->u.kernel.target = target; | |
680 | ||
add67461 | 681 | ret = check_target(e, net, name); |
3cdc7c95 PM |
682 | if (ret) |
683 | goto err; | |
1da177e4 | 684 | return 0; |
3cdc7c95 PM |
685 | err: |
686 | module_put(t->u.kernel.target->me); | |
1da177e4 | 687 | cleanup_matches: |
6bdb331b JE |
688 | xt_ematch_foreach(ematch, e) { |
689 | if (j-- == 0) | |
dcea992a | 690 | break; |
6bdb331b JE |
691 | cleanup_match(ematch, net); |
692 | } | |
1da177e4 LT |
693 | return ret; |
694 | } | |
695 | ||
d5d1baa1 | 696 | static bool check_underflow(const struct ipt_entry *e) |
e2fe35c1 | 697 | { |
87a2e70d | 698 | const struct xt_entry_target *t; |
e2fe35c1 JE |
699 | unsigned int verdict; |
700 | ||
4b9e9796 | 701 | if (!unconditional(e)) |
e2fe35c1 | 702 | return false; |
d5d1baa1 | 703 | t = ipt_get_target_c(e); |
e2fe35c1 JE |
704 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
705 | return false; | |
87a2e70d | 706 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
707 | verdict = -verdict - 1; |
708 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
709 | } | |
710 | ||
022748a9 | 711 | static int |
1da177e4 | 712 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 713 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
714 | const unsigned char *base, |
715 | const unsigned char *limit, | |
1da177e4 LT |
716 | const unsigned int *hook_entries, |
717 | const unsigned int *underflows, | |
0559518b | 718 | unsigned int valid_hooks) |
1da177e4 LT |
719 | { |
720 | unsigned int h; | |
4b9e9796 | 721 | int err; |
1da177e4 | 722 | |
3666ed1c | 723 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 || |
4b9e9796 S |
724 | (unsigned char *)e + sizeof(struct ipt_entry) >= limit || |
725 | (unsigned char *)e + e->next_offset > limit) { | |
1da177e4 LT |
726 | duprintf("Bad offset %p\n", e); |
727 | return -EINVAL; | |
728 | } | |
729 | ||
730 | if (e->next_offset | |
87a2e70d | 731 | < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target)) { |
1da177e4 LT |
732 | duprintf("checking: element %p size %u\n", |
733 | e, e->next_offset); | |
734 | return -EINVAL; | |
735 | } | |
736 | ||
4b9e9796 S |
737 | err = check_entry(e); |
738 | if (err) | |
739 | return err; | |
740 | ||
1da177e4 | 741 | /* Check hooks & underflows */ |
6e23ae2a | 742 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
743 | if (!(valid_hooks & (1 << h))) |
744 | continue; | |
1da177e4 LT |
745 | if ((unsigned char *)e - base == hook_entries[h]) |
746 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 747 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
748 | if (!check_underflow(e)) { |
749 | pr_err("Underflows must be unconditional and " | |
750 | "use the STANDARD target with " | |
751 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
752 | return -EINVAL; |
753 | } | |
1da177e4 | 754 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 755 | } |
1da177e4 LT |
756 | } |
757 | ||
1da177e4 | 758 | /* Clear counters and comefrom */ |
2e4e6a17 | 759 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 760 | e->comefrom = 0; |
1da177e4 LT |
761 | return 0; |
762 | } | |
763 | ||
0559518b JE |
764 | static void |
765 | cleanup_entry(struct ipt_entry *e, struct net *net) | |
1da177e4 | 766 | { |
a2df1648 | 767 | struct xt_tgdtor_param par; |
87a2e70d | 768 | struct xt_entry_target *t; |
dcea992a | 769 | struct xt_entry_match *ematch; |
1da177e4 | 770 | |
1da177e4 | 771 | /* Cleanup all matches */ |
dcea992a | 772 | xt_ematch_foreach(ematch, e) |
6bdb331b | 773 | cleanup_match(ematch, net); |
1da177e4 | 774 | t = ipt_get_target(e); |
a2df1648 | 775 | |
add67461 | 776 | par.net = net; |
a2df1648 JE |
777 | par.target = t->u.kernel.target; |
778 | par.targinfo = t->data; | |
916a917d | 779 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
780 | if (par.target->destroy != NULL) |
781 | par.target->destroy(&par); | |
782 | module_put(par.target->me); | |
1da177e4 LT |
783 | } |
784 | ||
785 | /* Checks and translates the user-supplied table segment (held in | |
786 | newinfo) */ | |
787 | static int | |
0f234214 JE |
788 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
789 | const struct ipt_replace *repl) | |
1da177e4 | 790 | { |
72b2b1dd | 791 | struct ipt_entry *iter; |
1da177e4 | 792 | unsigned int i; |
72b2b1dd | 793 | int ret = 0; |
1da177e4 | 794 | |
0f234214 JE |
795 | newinfo->size = repl->size; |
796 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
797 | |
798 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 799 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
800 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
801 | newinfo->underflow[i] = 0xFFFFFFFF; | |
802 | } | |
803 | ||
804 | duprintf("translate_table: size %u\n", newinfo->size); | |
805 | i = 0; | |
806 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
807 | xt_entry_foreach(iter, entry0, newinfo->size) { |
808 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
809 | entry0 + repl->size, |
810 | repl->hook_entry, | |
811 | repl->underflow, | |
812 | repl->valid_hooks); | |
72b2b1dd | 813 | if (ret != 0) |
0559518b JE |
814 | return ret; |
815 | ++i; | |
f3c5c1bf JE |
816 | if (strcmp(ipt_get_target(iter)->u.user.name, |
817 | XT_ERROR_TARGET) == 0) | |
818 | ++newinfo->stacksize; | |
72b2b1dd | 819 | } |
1da177e4 | 820 | |
0f234214 | 821 | if (i != repl->num_entries) { |
1da177e4 | 822 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 823 | i, repl->num_entries); |
1da177e4 LT |
824 | return -EINVAL; |
825 | } | |
826 | ||
827 | /* Check hooks all assigned */ | |
6e23ae2a | 828 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 829 | /* Only hooks which are valid */ |
0f234214 | 830 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
831 | continue; |
832 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
833 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 834 | i, repl->hook_entry[i]); |
1da177e4 LT |
835 | return -EINVAL; |
836 | } | |
837 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
838 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 839 | i, repl->underflow[i]); |
1da177e4 LT |
840 | return -EINVAL; |
841 | } | |
842 | } | |
843 | ||
0f234214 | 844 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
845 | return -ELOOP; |
846 | ||
1da177e4 LT |
847 | /* Finally, each sanity check must pass */ |
848 | i = 0; | |
72b2b1dd | 849 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 850 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
851 | if (ret != 0) |
852 | break; | |
0559518b | 853 | ++i; |
72b2b1dd | 854 | } |
1da177e4 | 855 | |
74c9c0c1 | 856 | if (ret != 0) { |
0559518b JE |
857 | xt_entry_foreach(iter, entry0, newinfo->size) { |
858 | if (i-- == 0) | |
72b2b1dd | 859 | break; |
0559518b JE |
860 | cleanup_entry(iter, net); |
861 | } | |
74c9c0c1 DM |
862 | return ret; |
863 | } | |
1da177e4 LT |
864 | |
865 | /* And one copy for every other CPU */ | |
6f912042 | 866 | for_each_possible_cpu(i) { |
31836064 ED |
867 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
868 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
869 | } |
870 | ||
871 | return ret; | |
872 | } | |
873 | ||
1da177e4 | 874 | static void |
2e4e6a17 HW |
875 | get_counters(const struct xt_table_info *t, |
876 | struct xt_counters counters[]) | |
1da177e4 | 877 | { |
72b2b1dd | 878 | struct ipt_entry *iter; |
1da177e4 LT |
879 | unsigned int cpu; |
880 | unsigned int i; | |
881 | ||
6f912042 | 882 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 883 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 884 | |
1da177e4 | 885 | i = 0; |
0559518b | 886 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
83723d60 ED |
887 | u64 bcnt, pcnt; |
888 | unsigned int start; | |
889 | ||
890 | do { | |
7f5c6d4f | 891 | start = read_seqcount_begin(s); |
83723d60 ED |
892 | bcnt = iter->counters.bcnt; |
893 | pcnt = iter->counters.pcnt; | |
7f5c6d4f | 894 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
895 | |
896 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
897 | ++i; /* macro does multi eval of i */ |
898 | } | |
1da177e4 | 899 | } |
78454473 SH |
900 | } |
901 | ||
d5d1baa1 | 902 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 903 | { |
2722971c | 904 | unsigned int countersize; |
2e4e6a17 | 905 | struct xt_counters *counters; |
d5d1baa1 | 906 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
907 | |
908 | /* We need atomic snapshot of counters: rest doesn't change | |
909 | (other than comefrom, which userspace doesn't care | |
910 | about). */ | |
2e4e6a17 | 911 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 912 | counters = vzalloc(countersize); |
1da177e4 LT |
913 | |
914 | if (counters == NULL) | |
942e4a2b | 915 | return ERR_PTR(-ENOMEM); |
78454473 | 916 | |
942e4a2b | 917 | get_counters(private, counters); |
1da177e4 | 918 | |
2722971c DM |
919 | return counters; |
920 | } | |
921 | ||
922 | static int | |
923 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 924 | const struct xt_table *table, |
2722971c DM |
925 | void __user *userptr) |
926 | { | |
927 | unsigned int off, num; | |
d5d1baa1 | 928 | const struct ipt_entry *e; |
2722971c | 929 | struct xt_counters *counters; |
5452e425 | 930 | const struct xt_table_info *private = table->private; |
2722971c | 931 | int ret = 0; |
5452e425 | 932 | const void *loc_cpu_entry; |
2722971c DM |
933 | |
934 | counters = alloc_counters(table); | |
935 | if (IS_ERR(counters)) | |
936 | return PTR_ERR(counters); | |
937 | ||
31836064 ED |
938 | /* choose the copy that is on our node/cpu, ... |
939 | * This choice is lazy (because current thread is | |
940 | * allowed to migrate to another cpu) | |
941 | */ | |
2e4e6a17 | 942 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 943 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
944 | ret = -EFAULT; |
945 | goto free_counters; | |
946 | } | |
947 | ||
948 | /* FIXME: use iterator macros --RR */ | |
949 | /* ... then go back and fix counters and names */ | |
950 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
951 | unsigned int i; | |
87a2e70d JE |
952 | const struct xt_entry_match *m; |
953 | const struct xt_entry_target *t; | |
1da177e4 | 954 | |
31836064 | 955 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
956 | if (copy_to_user(userptr + off |
957 | + offsetof(struct ipt_entry, counters), | |
958 | &counters[num], | |
959 | sizeof(counters[num])) != 0) { | |
960 | ret = -EFAULT; | |
961 | goto free_counters; | |
962 | } | |
963 | ||
964 | for (i = sizeof(struct ipt_entry); | |
965 | i < e->target_offset; | |
966 | i += m->u.match_size) { | |
967 | m = (void *)e + i; | |
968 | ||
969 | if (copy_to_user(userptr + off + i | |
87a2e70d | 970 | + offsetof(struct xt_entry_match, |
1da177e4 LT |
971 | u.user.name), |
972 | m->u.kernel.match->name, | |
973 | strlen(m->u.kernel.match->name)+1) | |
974 | != 0) { | |
975 | ret = -EFAULT; | |
976 | goto free_counters; | |
977 | } | |
978 | } | |
979 | ||
d5d1baa1 | 980 | t = ipt_get_target_c(e); |
1da177e4 | 981 | if (copy_to_user(userptr + off + e->target_offset |
87a2e70d | 982 | + offsetof(struct xt_entry_target, |
1da177e4 LT |
983 | u.user.name), |
984 | t->u.kernel.target->name, | |
985 | strlen(t->u.kernel.target->name)+1) != 0) { | |
986 | ret = -EFAULT; | |
987 | goto free_counters; | |
988 | } | |
989 | } | |
990 | ||
991 | free_counters: | |
992 | vfree(counters); | |
993 | return ret; | |
994 | } | |
995 | ||
2722971c | 996 | #ifdef CONFIG_COMPAT |
739674fb | 997 | static void compat_standard_from_user(void *dst, const void *src) |
2722971c | 998 | { |
9fa492cd | 999 | int v = *(compat_int_t *)src; |
2722971c | 1000 | |
9fa492cd | 1001 | if (v > 0) |
b386d9f5 | 1002 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1003 | memcpy(dst, &v, sizeof(v)); |
1004 | } | |
46c5ea3c | 1005 | |
739674fb | 1006 | static int compat_standard_to_user(void __user *dst, const void *src) |
2722971c | 1007 | { |
9fa492cd | 1008 | compat_int_t cv = *(int *)src; |
2722971c | 1009 | |
9fa492cd | 1010 | if (cv > 0) |
b386d9f5 | 1011 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1012 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1013 | } |
1014 | ||
d5d1baa1 | 1015 | static int compat_calc_entry(const struct ipt_entry *e, |
4b478248 | 1016 | const struct xt_table_info *info, |
d5d1baa1 | 1017 | const void *base, struct xt_table_info *newinfo) |
2722971c | 1018 | { |
dcea992a | 1019 | const struct xt_entry_match *ematch; |
87a2e70d | 1020 | const struct xt_entry_target *t; |
e5b5ef7d | 1021 | unsigned int entry_offset; |
2722971c DM |
1022 | int off, i, ret; |
1023 | ||
30c08c41 | 1024 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c | 1025 | entry_offset = (void *)e - base; |
dcea992a | 1026 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1027 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1028 | t = ipt_get_target_c(e); |
9fa492cd | 1029 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1030 | newinfo->size -= off; |
b386d9f5 | 1031 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1032 | if (ret) |
1033 | return ret; | |
1034 | ||
6e23ae2a | 1035 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1036 | if (info->hook_entry[i] && |
1037 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1038 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1039 | if (info->underflow[i] && |
1040 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1041 | newinfo->underflow[i] -= off; |
1042 | } | |
1043 | return 0; | |
1044 | } | |
1045 | ||
259d4e41 | 1046 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1047 | struct xt_table_info *newinfo) |
2722971c | 1048 | { |
72b2b1dd | 1049 | struct ipt_entry *iter; |
2722971c | 1050 | void *loc_cpu_entry; |
0559518b | 1051 | int ret; |
2722971c DM |
1052 | |
1053 | if (!newinfo || !info) | |
1054 | return -EINVAL; | |
1055 | ||
259d4e41 ED |
1056 | /* we dont care about newinfo->entries[] */ |
1057 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1058 | newinfo->initial_entries = 0; | |
2722971c | 1059 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
255d0dc3 | 1060 | xt_compat_init_offsets(AF_INET, info->number); |
72b2b1dd JE |
1061 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1062 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1063 | if (ret != 0) | |
0559518b | 1064 | return ret; |
72b2b1dd | 1065 | } |
0559518b | 1066 | return 0; |
2722971c DM |
1067 | } |
1068 | #endif | |
1069 | ||
d5d1baa1 JE |
1070 | static int get_info(struct net *net, void __user *user, |
1071 | const int *len, int compat) | |
2722971c | 1072 | { |
12b00c2c | 1073 | char name[XT_TABLE_MAXNAMELEN]; |
e60a13e0 | 1074 | struct xt_table *t; |
2722971c DM |
1075 | int ret; |
1076 | ||
1077 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1078 | duprintf("length %u != %zu\n", *len, |
1079 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1080 | return -EINVAL; |
1081 | } | |
1082 | ||
1083 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1084 | return -EFAULT; | |
1085 | ||
12b00c2c | 1086 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
2722971c DM |
1087 | #ifdef CONFIG_COMPAT |
1088 | if (compat) | |
1089 | xt_compat_lock(AF_INET); | |
1090 | #endif | |
34bd137b | 1091 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1092 | "iptable_%s", name); |
0cc8d8df | 1093 | if (!IS_ERR_OR_NULL(t)) { |
2722971c | 1094 | struct ipt_getinfo info; |
5452e425 | 1095 | const struct xt_table_info *private = t->private; |
2722971c | 1096 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1097 | struct xt_table_info tmp; |
1098 | ||
2722971c | 1099 | if (compat) { |
2722971c | 1100 | ret = compat_table_info(private, &tmp); |
b386d9f5 | 1101 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1102 | private = &tmp; |
2722971c DM |
1103 | } |
1104 | #endif | |
b5f15ac4 | 1105 | memset(&info, 0, sizeof(info)); |
2722971c DM |
1106 | info.valid_hooks = t->valid_hooks; |
1107 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1108 | sizeof(info.hook_entry)); |
2722971c | 1109 | memcpy(info.underflow, private->underflow, |
4b478248 | 1110 | sizeof(info.underflow)); |
2722971c DM |
1111 | info.num_entries = private->number; |
1112 | info.size = private->size; | |
1113 | strcpy(info.name, name); | |
1114 | ||
1115 | if (copy_to_user(user, &info, *len) != 0) | |
1116 | ret = -EFAULT; | |
1117 | else | |
1118 | ret = 0; | |
1119 | ||
1120 | xt_table_unlock(t); | |
1121 | module_put(t->me); | |
1122 | } else | |
1123 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1124 | #ifdef CONFIG_COMPAT | |
1125 | if (compat) | |
1126 | xt_compat_unlock(AF_INET); | |
1127 | #endif | |
1128 | return ret; | |
1129 | } | |
1130 | ||
1131 | static int | |
d5d1baa1 JE |
1132 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
1133 | const int *len) | |
2722971c DM |
1134 | { |
1135 | int ret; | |
1136 | struct ipt_get_entries get; | |
e60a13e0 | 1137 | struct xt_table *t; |
2722971c DM |
1138 | |
1139 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1140 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1141 | return -EINVAL; |
1142 | } | |
1143 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1144 | return -EFAULT; | |
1145 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1146 | duprintf("get_entries: %u != %zu\n", |
1147 | *len, sizeof(get) + get.size); | |
2722971c DM |
1148 | return -EINVAL; |
1149 | } | |
1150 | ||
34bd137b | 1151 | t = xt_find_table_lock(net, AF_INET, get.name); |
0cc8d8df | 1152 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1153 | const struct xt_table_info *private = t->private; |
9c547959 | 1154 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1155 | if (get.size == private->size) |
1156 | ret = copy_entries_to_user(private->size, | |
1157 | t, uptr->entrytable); | |
1158 | else { | |
1159 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1160 | private->size, get.size); |
544473c1 | 1161 | ret = -EAGAIN; |
2722971c DM |
1162 | } |
1163 | module_put(t->me); | |
1164 | xt_table_unlock(t); | |
1165 | } else | |
1166 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1167 | ||
1168 | return ret; | |
1169 | } | |
1170 | ||
1171 | static int | |
34bd137b | 1172 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1173 | struct xt_table_info *newinfo, unsigned int num_counters, |
1174 | void __user *counters_ptr) | |
2722971c DM |
1175 | { |
1176 | int ret; | |
e60a13e0 | 1177 | struct xt_table *t; |
2722971c DM |
1178 | struct xt_table_info *oldinfo; |
1179 | struct xt_counters *counters; | |
1180 | void *loc_cpu_old_entry; | |
72b2b1dd | 1181 | struct ipt_entry *iter; |
2722971c DM |
1182 | |
1183 | ret = 0; | |
83723d60 | 1184 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
2722971c DM |
1185 | if (!counters) { |
1186 | ret = -ENOMEM; | |
1187 | goto out; | |
1188 | } | |
1189 | ||
34bd137b | 1190 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c | 1191 | "iptable_%s", name); |
0cc8d8df | 1192 | if (IS_ERR_OR_NULL(t)) { |
2722971c DM |
1193 | ret = t ? PTR_ERR(t) : -ENOENT; |
1194 | goto free_newinfo_counters_untrans; | |
1195 | } | |
1196 | ||
1197 | /* You lied! */ | |
1198 | if (valid_hooks != t->valid_hooks) { | |
1199 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1200 | valid_hooks, t->valid_hooks); | |
1201 | ret = -EINVAL; | |
1202 | goto put_module; | |
1203 | } | |
1204 | ||
1205 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1206 | if (!oldinfo) | |
1207 | goto put_module; | |
1208 | ||
1209 | /* Update module usage count based on number of rules */ | |
1210 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1211 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1212 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1213 | (newinfo->number <= oldinfo->initial_entries)) | |
1214 | module_put(t->me); | |
1215 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1216 | (newinfo->number <= oldinfo->initial_entries)) | |
1217 | module_put(t->me); | |
1218 | ||
942e4a2b | 1219 | /* Get the old counters, and synchronize with replace */ |
2722971c | 1220 | get_counters(oldinfo, counters); |
942e4a2b | 1221 | |
2722971c DM |
1222 | /* Decrease module usage counts and free resource */ |
1223 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
72b2b1dd | 1224 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1225 | cleanup_entry(iter, net); |
72b2b1dd | 1226 | |
2722971c DM |
1227 | xt_free_table_info(oldinfo); |
1228 | if (copy_to_user(counters_ptr, counters, | |
c5e4ef49 TG |
1229 | sizeof(struct xt_counters) * num_counters) != 0) { |
1230 | /* Silent error, can't fail, new table is already in place */ | |
1231 | net_warn_ratelimited("iptables: counters copy to user failed while replacing table\n"); | |
1232 | } | |
2722971c DM |
1233 | vfree(counters); |
1234 | xt_table_unlock(t); | |
1235 | return ret; | |
1236 | ||
1237 | put_module: | |
1238 | module_put(t->me); | |
1239 | xt_table_unlock(t); | |
1240 | free_newinfo_counters_untrans: | |
1241 | vfree(counters); | |
1242 | out: | |
1243 | return ret; | |
1244 | } | |
1245 | ||
1246 | static int | |
d5d1baa1 | 1247 | do_replace(struct net *net, const void __user *user, unsigned int len) |
2722971c DM |
1248 | { |
1249 | int ret; | |
1250 | struct ipt_replace tmp; | |
1251 | struct xt_table_info *newinfo; | |
1252 | void *loc_cpu_entry; | |
72b2b1dd | 1253 | struct ipt_entry *iter; |
2722971c DM |
1254 | |
1255 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1256 | return -EFAULT; | |
1257 | ||
2722971c | 1258 | /* overflow check */ |
2722971c DM |
1259 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1260 | return -ENOMEM; | |
78b79876 | 1261 | tmp.name[sizeof(tmp.name)-1] = 0; |
2722971c DM |
1262 | |
1263 | newinfo = xt_alloc_table_info(tmp.size); | |
1264 | if (!newinfo) | |
1265 | return -ENOMEM; | |
1266 | ||
9c547959 | 1267 | /* choose the copy that is on our node/cpu */ |
2722971c DM |
1268 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1269 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1270 | tmp.size) != 0) { | |
1271 | ret = -EFAULT; | |
1272 | goto free_newinfo; | |
1273 | } | |
1274 | ||
0f234214 | 1275 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
2722971c DM |
1276 | if (ret != 0) |
1277 | goto free_newinfo; | |
1278 | ||
ff67e4e4 | 1279 | duprintf("Translated table\n"); |
2722971c | 1280 | |
34bd137b | 1281 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1282 | tmp.num_counters, tmp.counters); |
2722971c DM |
1283 | if (ret) |
1284 | goto free_newinfo_untrans; | |
1285 | return 0; | |
1286 | ||
1287 | free_newinfo_untrans: | |
72b2b1dd | 1288 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1289 | cleanup_entry(iter, net); |
2722971c DM |
1290 | free_newinfo: |
1291 | xt_free_table_info(newinfo); | |
1292 | return ret; | |
1293 | } | |
1294 | ||
2722971c | 1295 | static int |
d5d1baa1 JE |
1296 | do_add_counters(struct net *net, const void __user *user, |
1297 | unsigned int len, int compat) | |
2722971c | 1298 | { |
942e4a2b | 1299 | unsigned int i, curcpu; |
2722971c DM |
1300 | struct xt_counters_info tmp; |
1301 | struct xt_counters *paddc; | |
1302 | unsigned int num_counters; | |
5452e425 | 1303 | const char *name; |
2722971c DM |
1304 | int size; |
1305 | void *ptmp; | |
e60a13e0 | 1306 | struct xt_table *t; |
5452e425 | 1307 | const struct xt_table_info *private; |
2722971c DM |
1308 | int ret = 0; |
1309 | void *loc_cpu_entry; | |
72b2b1dd | 1310 | struct ipt_entry *iter; |
7f5c6d4f | 1311 | unsigned int addend; |
2722971c DM |
1312 | #ifdef CONFIG_COMPAT |
1313 | struct compat_xt_counters_info compat_tmp; | |
1314 | ||
1315 | if (compat) { | |
1316 | ptmp = &compat_tmp; | |
1317 | size = sizeof(struct compat_xt_counters_info); | |
1318 | } else | |
1319 | #endif | |
1320 | { | |
1321 | ptmp = &tmp; | |
1322 | size = sizeof(struct xt_counters_info); | |
1323 | } | |
1324 | ||
1325 | if (copy_from_user(ptmp, user, size) != 0) | |
1326 | return -EFAULT; | |
1327 | ||
1328 | #ifdef CONFIG_COMPAT | |
1329 | if (compat) { | |
1330 | num_counters = compat_tmp.num_counters; | |
1331 | name = compat_tmp.name; | |
1332 | } else | |
1333 | #endif | |
1334 | { | |
1335 | num_counters = tmp.num_counters; | |
1336 | name = tmp.name; | |
1337 | } | |
1338 | ||
1339 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1340 | return -EINVAL; | |
1341 | ||
e12f8e29 | 1342 | paddc = vmalloc(len - size); |
2722971c DM |
1343 | if (!paddc) |
1344 | return -ENOMEM; | |
1345 | ||
1346 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1347 | ret = -EFAULT; | |
1348 | goto free; | |
1349 | } | |
1350 | ||
34bd137b | 1351 | t = xt_find_table_lock(net, AF_INET, name); |
0cc8d8df | 1352 | if (IS_ERR_OR_NULL(t)) { |
2722971c DM |
1353 | ret = t ? PTR_ERR(t) : -ENOENT; |
1354 | goto free; | |
1355 | } | |
1356 | ||
942e4a2b | 1357 | local_bh_disable(); |
2722971c DM |
1358 | private = t->private; |
1359 | if (private->number != num_counters) { | |
1360 | ret = -EINVAL; | |
1361 | goto unlock_up_free; | |
1362 | } | |
1363 | ||
1364 | i = 0; | |
1365 | /* Choose the copy that is on our node */ | |
942e4a2b SH |
1366 | curcpu = smp_processor_id(); |
1367 | loc_cpu_entry = private->entries[curcpu]; | |
7f5c6d4f | 1368 | addend = xt_write_recseq_begin(); |
0559518b JE |
1369 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1370 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1371 | ++i; | |
1372 | } | |
7f5c6d4f | 1373 | xt_write_recseq_end(addend); |
2722971c | 1374 | unlock_up_free: |
942e4a2b | 1375 | local_bh_enable(); |
2722971c DM |
1376 | xt_table_unlock(t); |
1377 | module_put(t->me); | |
1378 | free: | |
1379 | vfree(paddc); | |
1380 | ||
1381 | return ret; | |
1382 | } | |
1383 | ||
1384 | #ifdef CONFIG_COMPAT | |
1385 | struct compat_ipt_replace { | |
12b00c2c | 1386 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1387 | u32 valid_hooks; |
1388 | u32 num_entries; | |
1389 | u32 size; | |
6e23ae2a PM |
1390 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1391 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c | 1392 | u32 num_counters; |
87a2e70d | 1393 | compat_uptr_t counters; /* struct xt_counters * */ |
2722971c DM |
1394 | struct compat_ipt_entry entries[0]; |
1395 | }; | |
1396 | ||
a18aa31b PM |
1397 | static int |
1398 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1399 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1400 | unsigned int i) |
2722971c | 1401 | { |
87a2e70d | 1402 | struct xt_entry_target *t; |
2722971c DM |
1403 | struct compat_ipt_entry __user *ce; |
1404 | u_int16_t target_offset, next_offset; | |
1405 | compat_uint_t origsize; | |
dcea992a JE |
1406 | const struct xt_entry_match *ematch; |
1407 | int ret = 0; | |
2722971c | 1408 | |
2722971c DM |
1409 | origsize = *size; |
1410 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
0559518b JE |
1411 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
1412 | copy_to_user(&ce->counters, &counters[i], | |
1413 | sizeof(counters[i])) != 0) | |
1414 | return -EFAULT; | |
a18aa31b | 1415 | |
2722971c | 1416 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1417 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1418 | ||
dcea992a JE |
1419 | xt_ematch_foreach(ematch, e) { |
1420 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1421 | if (ret != 0) | |
6bdb331b | 1422 | return ret; |
dcea992a | 1423 | } |
2722971c | 1424 | target_offset = e->target_offset - (origsize - *size); |
2722971c | 1425 | t = ipt_get_target(e); |
9fa492cd | 1426 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c | 1427 | if (ret) |
0559518b | 1428 | return ret; |
2722971c | 1429 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1430 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1431 | put_user(next_offset, &ce->next_offset) != 0) | |
1432 | return -EFAULT; | |
2722971c | 1433 | return 0; |
2722971c DM |
1434 | } |
1435 | ||
022748a9 | 1436 | static int |
87a2e70d | 1437 | compat_find_calc_match(struct xt_entry_match *m, |
4b478248 PM |
1438 | const char *name, |
1439 | const struct ipt_ip *ip, | |
1440 | unsigned int hookmask, | |
6bdb331b | 1441 | int *size) |
2722971c | 1442 | { |
6709dbbb | 1443 | struct xt_match *match; |
2722971c | 1444 | |
fd0ec0e6 JE |
1445 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
1446 | m->u.user.revision); | |
1447 | if (IS_ERR(match)) { | |
2722971c | 1448 | duprintf("compat_check_calc_match: `%s' not found\n", |
4b478248 | 1449 | m->u.user.name); |
fd0ec0e6 | 1450 | return PTR_ERR(match); |
2722971c DM |
1451 | } |
1452 | m->u.kernel.match = match; | |
9fa492cd | 1453 | *size += xt_compat_match_offset(match); |
4c1b52bc DM |
1454 | return 0; |
1455 | } | |
1456 | ||
0559518b | 1457 | static void compat_release_entry(struct compat_ipt_entry *e) |
4c1b52bc | 1458 | { |
87a2e70d | 1459 | struct xt_entry_target *t; |
dcea992a | 1460 | struct xt_entry_match *ematch; |
4c1b52bc | 1461 | |
4c1b52bc | 1462 | /* Cleanup all matches */ |
dcea992a | 1463 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1464 | module_put(ematch->u.kernel.match->me); |
73cd598d | 1465 | t = compat_ipt_get_target(e); |
4c1b52bc | 1466 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1467 | } |
1468 | ||
022748a9 | 1469 | static int |
73cd598d | 1470 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1471 | struct xt_table_info *newinfo, |
1472 | unsigned int *size, | |
d5d1baa1 JE |
1473 | const unsigned char *base, |
1474 | const unsigned char *limit, | |
1475 | const unsigned int *hook_entries, | |
1476 | const unsigned int *underflows, | |
4b478248 | 1477 | const char *name) |
2722971c | 1478 | { |
dcea992a | 1479 | struct xt_entry_match *ematch; |
87a2e70d | 1480 | struct xt_entry_target *t; |
6709dbbb | 1481 | struct xt_target *target; |
e5b5ef7d | 1482 | unsigned int entry_offset; |
b0a6363c PM |
1483 | unsigned int j; |
1484 | int ret, off, h; | |
2722971c DM |
1485 | |
1486 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c | 1487 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
4b9e9796 S |
1488 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit || |
1489 | (unsigned char *)e + e->next_offset > limit) { | |
2722971c DM |
1490 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1491 | return -EINVAL; | |
1492 | } | |
1493 | ||
1494 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1495 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1496 | duprintf("checking: element %p size %u\n", |
1497 | e, e->next_offset); | |
1498 | return -EINVAL; | |
1499 | } | |
1500 | ||
73cd598d | 1501 | /* For purposes of check_entry casting the compat entry is fine */ |
4b9e9796 | 1502 | ret = check_entry((struct ipt_entry *)e); |
a96be246 DM |
1503 | if (ret) |
1504 | return ret; | |
590bdf7f | 1505 | |
30c08c41 | 1506 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1507 | entry_offset = (void *)e - (void *)base; |
1508 | j = 0; | |
dcea992a JE |
1509 | xt_ematch_foreach(ematch, e) { |
1510 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1511 | &e->ip, e->comefrom, &off); |
dcea992a | 1512 | if (ret != 0) |
6bdb331b JE |
1513 | goto release_matches; |
1514 | ++j; | |
dcea992a | 1515 | } |
2722971c | 1516 | |
73cd598d | 1517 | t = compat_ipt_get_target(e); |
d2a7b6ba JE |
1518 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
1519 | t->u.user.revision); | |
1520 | if (IS_ERR(target)) { | |
a96be246 | 1521 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1522 | t->u.user.name); |
d2a7b6ba | 1523 | ret = PTR_ERR(target); |
4c1b52bc | 1524 | goto release_matches; |
2722971c DM |
1525 | } |
1526 | t->u.kernel.target = target; | |
1527 | ||
9fa492cd | 1528 | off += xt_compat_target_offset(target); |
2722971c | 1529 | *size += off; |
b386d9f5 | 1530 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1531 | if (ret) |
1532 | goto out; | |
1533 | ||
1534 | /* Check hooks & underflows */ | |
6e23ae2a | 1535 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1536 | if ((unsigned char *)e - base == hook_entries[h]) |
1537 | newinfo->hook_entry[h] = hook_entries[h]; | |
1538 | if ((unsigned char *)e - base == underflows[h]) | |
1539 | newinfo->underflow[h] = underflows[h]; | |
1540 | } | |
1541 | ||
1542 | /* Clear counters and comefrom */ | |
73cd598d | 1543 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c | 1544 | e->comefrom = 0; |
2722971c | 1545 | return 0; |
bec71b16 | 1546 | |
2722971c | 1547 | out: |
bec71b16 | 1548 | module_put(t->u.kernel.target->me); |
4c1b52bc | 1549 | release_matches: |
6bdb331b JE |
1550 | xt_ematch_foreach(ematch, e) { |
1551 | if (j-- == 0) | |
dcea992a | 1552 | break; |
6bdb331b JE |
1553 | module_put(ematch->u.kernel.match->me); |
1554 | } | |
2722971c DM |
1555 | return ret; |
1556 | } | |
1557 | ||
4b478248 | 1558 | static int |
73cd598d | 1559 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1560 | unsigned int *size, const char *name, |
1561 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c | 1562 | { |
87a2e70d | 1563 | struct xt_entry_target *t; |
6709dbbb | 1564 | struct xt_target *target; |
2722971c DM |
1565 | struct ipt_entry *de; |
1566 | unsigned int origsize; | |
920b868a | 1567 | int ret, h; |
dcea992a | 1568 | struct xt_entry_match *ematch; |
2722971c DM |
1569 | |
1570 | ret = 0; | |
1571 | origsize = *size; | |
1572 | de = (struct ipt_entry *)*dstptr; | |
1573 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1574 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1575 | |
73cd598d | 1576 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1577 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1578 | ||
dcea992a JE |
1579 | xt_ematch_foreach(ematch, e) { |
1580 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1581 | if (ret != 0) | |
6bdb331b | 1582 | return ret; |
dcea992a | 1583 | } |
2722971c | 1584 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1585 | t = compat_ipt_get_target(e); |
2722971c | 1586 | target = t->u.kernel.target; |
9fa492cd | 1587 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1588 | |
1589 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1590 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1591 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1592 | newinfo->hook_entry[h] -= origsize - *size; | |
1593 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1594 | newinfo->underflow[h] -= origsize - *size; | |
1595 | } | |
f6677f43 DM |
1596 | return ret; |
1597 | } | |
1598 | ||
022748a9 | 1599 | static int |
0559518b | 1600 | compat_check_entry(struct ipt_entry *e, struct net *net, const char *name) |
f6677f43 | 1601 | { |
dcea992a | 1602 | struct xt_entry_match *ematch; |
9b4fce7a | 1603 | struct xt_mtchk_param mtpar; |
b0a6363c | 1604 | unsigned int j; |
dcea992a | 1605 | int ret = 0; |
f6677f43 | 1606 | |
4c1b52bc | 1607 | j = 0; |
a83d8e8d | 1608 | mtpar.net = net; |
9b4fce7a JE |
1609 | mtpar.table = name; |
1610 | mtpar.entryinfo = &e->ip; | |
1611 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1612 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 1613 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1614 | ret = check_match(ematch, &mtpar); |
dcea992a | 1615 | if (ret != 0) |
6bdb331b JE |
1616 | goto cleanup_matches; |
1617 | ++j; | |
dcea992a | 1618 | } |
4c1b52bc | 1619 | |
add67461 | 1620 | ret = check_target(e, net, name); |
4c1b52bc DM |
1621 | if (ret) |
1622 | goto cleanup_matches; | |
4c1b52bc DM |
1623 | return 0; |
1624 | ||
1625 | cleanup_matches: | |
6bdb331b JE |
1626 | xt_ematch_foreach(ematch, e) { |
1627 | if (j-- == 0) | |
dcea992a | 1628 | break; |
6bdb331b JE |
1629 | cleanup_match(ematch, net); |
1630 | } | |
4c1b52bc | 1631 | return ret; |
f6677f43 DM |
1632 | } |
1633 | ||
1da177e4 | 1634 | static int |
a83d8e8d AD |
1635 | translate_compat_table(struct net *net, |
1636 | const char *name, | |
4b478248 PM |
1637 | unsigned int valid_hooks, |
1638 | struct xt_table_info **pinfo, | |
1639 | void **pentry0, | |
1640 | unsigned int total_size, | |
1641 | unsigned int number, | |
1642 | unsigned int *hook_entries, | |
1643 | unsigned int *underflows) | |
1da177e4 | 1644 | { |
920b868a | 1645 | unsigned int i, j; |
2722971c DM |
1646 | struct xt_table_info *newinfo, *info; |
1647 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1648 | struct compat_ipt_entry *iter0; |
1649 | struct ipt_entry *iter1; | |
2722971c | 1650 | unsigned int size; |
0559518b | 1651 | int ret; |
1da177e4 | 1652 | |
2722971c DM |
1653 | info = *pinfo; |
1654 | entry0 = *pentry0; | |
1655 | size = total_size; | |
1656 | info->number = number; | |
1657 | ||
1658 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1659 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1660 | info->hook_entry[i] = 0xFFFFFFFF; |
1661 | info->underflow[i] = 0xFFFFFFFF; | |
1662 | } | |
1663 | ||
1664 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1665 | j = 0; |
2722971c | 1666 | xt_compat_lock(AF_INET); |
255d0dc3 | 1667 | xt_compat_init_offsets(AF_INET, number); |
2722971c | 1668 | /* Walk through entries, checking offsets. */ |
72b2b1dd JE |
1669 | xt_entry_foreach(iter0, entry0, total_size) { |
1670 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1671 | entry0, |
1672 | entry0 + total_size, | |
1673 | hook_entries, | |
1674 | underflows, | |
1675 | name); | |
72b2b1dd | 1676 | if (ret != 0) |
0559518b JE |
1677 | goto out_unlock; |
1678 | ++j; | |
72b2b1dd | 1679 | } |
2722971c DM |
1680 | |
1681 | ret = -EINVAL; | |
920b868a | 1682 | if (j != number) { |
2722971c | 1683 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1684 | j, number); |
2722971c DM |
1685 | goto out_unlock; |
1686 | } | |
1687 | ||
1688 | /* Check hooks all assigned */ | |
6e23ae2a | 1689 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1690 | /* Only hooks which are valid */ |
1691 | if (!(valid_hooks & (1 << i))) | |
1692 | continue; | |
1693 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1694 | duprintf("Invalid hook entry %u %u\n", | |
1695 | i, hook_entries[i]); | |
1696 | goto out_unlock; | |
1da177e4 | 1697 | } |
2722971c DM |
1698 | if (info->underflow[i] == 0xFFFFFFFF) { |
1699 | duprintf("Invalid underflow %u %u\n", | |
1700 | i, underflows[i]); | |
1701 | goto out_unlock; | |
1702 | } | |
1703 | } | |
1704 | ||
1705 | ret = -ENOMEM; | |
1706 | newinfo = xt_alloc_table_info(size); | |
1707 | if (!newinfo) | |
1708 | goto out_unlock; | |
1709 | ||
1710 | newinfo->number = number; | |
6e23ae2a | 1711 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1712 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1713 | newinfo->underflow[i] = info->underflow[i]; | |
1714 | } | |
1715 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1716 | pos = entry1; | |
4b478248 | 1717 | size = total_size; |
72b2b1dd | 1718 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1719 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1720 | name, newinfo, entry1); | |
72b2b1dd JE |
1721 | if (ret != 0) |
1722 | break; | |
1723 | } | |
b386d9f5 | 1724 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1725 | xt_compat_unlock(AF_INET); |
1726 | if (ret) | |
1727 | goto free_newinfo; | |
1728 | ||
1729 | ret = -ELOOP; | |
1730 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1731 | goto free_newinfo; | |
1732 | ||
4c1b52bc | 1733 | i = 0; |
72b2b1dd | 1734 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1735 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1736 | if (ret != 0) |
1737 | break; | |
0559518b | 1738 | ++i; |
cca77b7c FW |
1739 | if (strcmp(ipt_get_target(iter1)->u.user.name, |
1740 | XT_ERROR_TARGET) == 0) | |
1741 | ++newinfo->stacksize; | |
72b2b1dd | 1742 | } |
4c1b52bc | 1743 | if (ret) { |
72b2b1dd JE |
1744 | /* |
1745 | * The first i matches need cleanup_entry (calls ->destroy) | |
1746 | * because they had called ->check already. The other j-i | |
1747 | * entries need only release. | |
1748 | */ | |
1749 | int skip = i; | |
4c1b52bc | 1750 | j -= i; |
72b2b1dd JE |
1751 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1752 | if (skip-- > 0) | |
1753 | continue; | |
0559518b | 1754 | if (j-- == 0) |
72b2b1dd | 1755 | break; |
0559518b | 1756 | compat_release_entry(iter0); |
72b2b1dd | 1757 | } |
0559518b JE |
1758 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1759 | if (i-- == 0) | |
72b2b1dd | 1760 | break; |
0559518b JE |
1761 | cleanup_entry(iter1, net); |
1762 | } | |
4c1b52bc DM |
1763 | xt_free_table_info(newinfo); |
1764 | return ret; | |
1765 | } | |
f6677f43 | 1766 | |
2722971c | 1767 | /* And one copy for every other CPU */ |
fb1bb34d | 1768 | for_each_possible_cpu(i) |
2722971c DM |
1769 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1770 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1771 | ||
1772 | *pinfo = newinfo; | |
1773 | *pentry0 = entry1; | |
1774 | xt_free_table_info(info); | |
1775 | return 0; | |
1da177e4 | 1776 | |
2722971c DM |
1777 | free_newinfo: |
1778 | xt_free_table_info(newinfo); | |
1779 | out: | |
0559518b JE |
1780 | xt_entry_foreach(iter0, entry0, total_size) { |
1781 | if (j-- == 0) | |
72b2b1dd | 1782 | break; |
0559518b JE |
1783 | compat_release_entry(iter0); |
1784 | } | |
1da177e4 | 1785 | return ret; |
2722971c | 1786 | out_unlock: |
b386d9f5 | 1787 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1788 | xt_compat_unlock(AF_INET); |
1789 | goto out; | |
1da177e4 LT |
1790 | } |
1791 | ||
1792 | static int | |
34bd137b | 1793 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1794 | { |
1795 | int ret; | |
2722971c DM |
1796 | struct compat_ipt_replace tmp; |
1797 | struct xt_table_info *newinfo; | |
1798 | void *loc_cpu_entry; | |
72b2b1dd | 1799 | struct ipt_entry *iter; |
1da177e4 LT |
1800 | |
1801 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1802 | return -EFAULT; | |
1803 | ||
ee4bb818 | 1804 | /* overflow check */ |
259d4e41 | 1805 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1806 | return -ENOMEM; |
1807 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1808 | return -ENOMEM; | |
78b79876 | 1809 | tmp.name[sizeof(tmp.name)-1] = 0; |
ee4bb818 | 1810 | |
2e4e6a17 | 1811 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1812 | if (!newinfo) |
1813 | return -ENOMEM; | |
1814 | ||
9c547959 | 1815 | /* choose the copy that is on our node/cpu */ |
31836064 ED |
1816 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1817 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1818 | tmp.size) != 0) { |
1819 | ret = -EFAULT; | |
1820 | goto free_newinfo; | |
1821 | } | |
1822 | ||
a83d8e8d | 1823 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
4b478248 PM |
1824 | &newinfo, &loc_cpu_entry, tmp.size, |
1825 | tmp.num_entries, tmp.hook_entry, | |
1826 | tmp.underflow); | |
2722971c | 1827 | if (ret != 0) |
1da177e4 | 1828 | goto free_newinfo; |
1da177e4 | 1829 | |
2722971c | 1830 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1831 | |
34bd137b | 1832 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1833 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1834 | if (ret) |
1835 | goto free_newinfo_untrans; | |
1836 | return 0; | |
1da177e4 | 1837 | |
2722971c | 1838 | free_newinfo_untrans: |
72b2b1dd | 1839 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1840 | cleanup_entry(iter, net); |
2722971c DM |
1841 | free_newinfo: |
1842 | xt_free_table_info(newinfo); | |
1843 | return ret; | |
1844 | } | |
1da177e4 | 1845 | |
2722971c DM |
1846 | static int |
1847 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1848 | unsigned int len) |
2722971c DM |
1849 | { |
1850 | int ret; | |
1da177e4 | 1851 | |
52e804c6 | 1852 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
2722971c | 1853 | return -EPERM; |
1da177e4 | 1854 | |
2722971c DM |
1855 | switch (cmd) { |
1856 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1857 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1858 | break; |
1da177e4 | 1859 | |
2722971c | 1860 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1861 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1862 | break; |
1863 | ||
1864 | default: | |
1865 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1866 | ret = -EINVAL; | |
1867 | } | |
1da177e4 | 1868 | |
1da177e4 LT |
1869 | return ret; |
1870 | } | |
1871 | ||
4b478248 | 1872 | struct compat_ipt_get_entries { |
12b00c2c | 1873 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1874 | compat_uint_t size; |
1875 | struct compat_ipt_entry entrytable[0]; | |
1876 | }; | |
1da177e4 | 1877 | |
4b478248 PM |
1878 | static int |
1879 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1880 | void __user *userptr) | |
2722971c | 1881 | { |
2722971c | 1882 | struct xt_counters *counters; |
5452e425 | 1883 | const struct xt_table_info *private = table->private; |
2722971c DM |
1884 | void __user *pos; |
1885 | unsigned int size; | |
1886 | int ret = 0; | |
5452e425 | 1887 | const void *loc_cpu_entry; |
a18aa31b | 1888 | unsigned int i = 0; |
72b2b1dd | 1889 | struct ipt_entry *iter; |
1da177e4 | 1890 | |
2722971c DM |
1891 | counters = alloc_counters(table); |
1892 | if (IS_ERR(counters)) | |
1893 | return PTR_ERR(counters); | |
1894 | ||
1895 | /* choose the copy that is on our node/cpu, ... | |
1896 | * This choice is lazy (because current thread is | |
1897 | * allowed to migrate to another cpu) | |
1898 | */ | |
1899 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1900 | pos = userptr; | |
1901 | size = total_size; | |
72b2b1dd JE |
1902 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1903 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1904 | &size, counters, i++); |
72b2b1dd JE |
1905 | if (ret != 0) |
1906 | break; | |
1907 | } | |
2722971c | 1908 | |
2722971c DM |
1909 | vfree(counters); |
1910 | return ret; | |
1da177e4 LT |
1911 | } |
1912 | ||
1913 | static int | |
34bd137b AD |
1914 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1915 | int *len) | |
1da177e4 | 1916 | { |
2722971c DM |
1917 | int ret; |
1918 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1919 | struct xt_table *t; |
1da177e4 | 1920 | |
2722971c | 1921 | if (*len < sizeof(get)) { |
c9d8fe13 | 1922 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1923 | return -EINVAL; |
2722971c | 1924 | } |
1da177e4 | 1925 | |
2722971c DM |
1926 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1927 | return -EFAULT; | |
1da177e4 | 1928 | |
2722971c | 1929 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1930 | duprintf("compat_get_entries: %u != %zu\n", |
1931 | *len, sizeof(get) + get.size); | |
2722971c | 1932 | return -EINVAL; |
1da177e4 LT |
1933 | } |
1934 | ||
2722971c | 1935 | xt_compat_lock(AF_INET); |
34bd137b | 1936 | t = xt_find_table_lock(net, AF_INET, get.name); |
0cc8d8df | 1937 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1938 | const struct xt_table_info *private = t->private; |
2722971c | 1939 | struct xt_table_info info; |
9c547959 | 1940 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1941 | ret = compat_table_info(private, &info); |
1942 | if (!ret && get.size == info.size) { | |
1943 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 1944 | t, uptr->entrytable); |
2722971c DM |
1945 | } else if (!ret) { |
1946 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1947 | private->size, get.size); |
544473c1 | 1948 | ret = -EAGAIN; |
2722971c | 1949 | } |
b386d9f5 | 1950 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1951 | module_put(t->me); |
1952 | xt_table_unlock(t); | |
1953 | } else | |
1da177e4 | 1954 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1955 | |
2722971c DM |
1956 | xt_compat_unlock(AF_INET); |
1957 | return ret; | |
1958 | } | |
1da177e4 | 1959 | |
79030ed0 PM |
1960 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1961 | ||
2722971c DM |
1962 | static int |
1963 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1964 | { | |
1965 | int ret; | |
1da177e4 | 1966 | |
52e804c6 | 1967 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
82fac054 BS |
1968 | return -EPERM; |
1969 | ||
2722971c DM |
1970 | switch (cmd) { |
1971 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1972 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1973 | break; |
1974 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1975 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1976 | break; |
1977 | default: | |
79030ed0 | 1978 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1979 | } |
1da177e4 LT |
1980 | return ret; |
1981 | } | |
2722971c | 1982 | #endif |
1da177e4 LT |
1983 | |
1984 | static int | |
9c547959 | 1985 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
1986 | { |
1987 | int ret; | |
1988 | ||
52e804c6 | 1989 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1990 | return -EPERM; |
1991 | ||
1992 | switch (cmd) { | |
1993 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1994 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1995 | break; |
1996 | ||
1997 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1998 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
1999 | break; |
2000 | ||
2001 | default: | |
2002 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
2003 | ret = -EINVAL; | |
2004 | } | |
2005 | ||
2006 | return ret; | |
2007 | } | |
2008 | ||
2009 | static int | |
2010 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2011 | { | |
2012 | int ret; | |
2013 | ||
52e804c6 | 2014 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2015 | return -EPERM; |
2016 | ||
2017 | switch (cmd) { | |
2722971c | 2018 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2019 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2020 | break; |
1da177e4 | 2021 | |
2722971c | 2022 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2023 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2024 | break; |
1da177e4 LT |
2025 | |
2026 | case IPT_SO_GET_REVISION_MATCH: | |
2027 | case IPT_SO_GET_REVISION_TARGET: { | |
12b00c2c | 2028 | struct xt_get_revision rev; |
2e4e6a17 | 2029 | int target; |
1da177e4 LT |
2030 | |
2031 | if (*len != sizeof(rev)) { | |
2032 | ret = -EINVAL; | |
2033 | break; | |
2034 | } | |
2035 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2036 | ret = -EFAULT; | |
2037 | break; | |
2038 | } | |
78b79876 | 2039 | rev.name[sizeof(rev.name)-1] = 0; |
1da177e4 LT |
2040 | |
2041 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2042 | target = 1; |
1da177e4 | 2043 | else |
2e4e6a17 | 2044 | target = 0; |
1da177e4 | 2045 | |
2e4e6a17 HW |
2046 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2047 | rev.revision, | |
2048 | target, &ret), | |
1da177e4 LT |
2049 | "ipt_%s", rev.name); |
2050 | break; | |
2051 | } | |
2052 | ||
2053 | default: | |
2054 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2055 | ret = -EINVAL; | |
2056 | } | |
2057 | ||
2058 | return ret; | |
2059 | } | |
2060 | ||
35aad0ff JE |
2061 | struct xt_table *ipt_register_table(struct net *net, |
2062 | const struct xt_table *table, | |
44d34e72 | 2063 | const struct ipt_replace *repl) |
1da177e4 LT |
2064 | { |
2065 | int ret; | |
2e4e6a17 | 2066 | struct xt_table_info *newinfo; |
f3c5c1bf | 2067 | struct xt_table_info bootstrap = {0}; |
31836064 | 2068 | void *loc_cpu_entry; |
a98da11d | 2069 | struct xt_table *new_table; |
1da177e4 | 2070 | |
2e4e6a17 | 2071 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2072 | if (!newinfo) { |
2073 | ret = -ENOMEM; | |
2074 | goto out; | |
2075 | } | |
1da177e4 | 2076 | |
9c547959 | 2077 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2078 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2079 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2080 | |
0f234214 | 2081 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2082 | if (ret != 0) |
2083 | goto out_free; | |
1da177e4 | 2084 | |
44d34e72 | 2085 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2086 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2087 | ret = PTR_ERR(new_table); |
2088 | goto out_free; | |
1da177e4 LT |
2089 | } |
2090 | ||
44d34e72 AD |
2091 | return new_table; |
2092 | ||
2093 | out_free: | |
2094 | xt_free_table_info(newinfo); | |
2095 | out: | |
2096 | return ERR_PTR(ret); | |
1da177e4 LT |
2097 | } |
2098 | ||
f54e9367 | 2099 | void ipt_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2100 | { |
2e4e6a17 | 2101 | struct xt_table_info *private; |
31836064 | 2102 | void *loc_cpu_entry; |
df200969 | 2103 | struct module *table_owner = table->me; |
72b2b1dd | 2104 | struct ipt_entry *iter; |
31836064 | 2105 | |
e905a9ed | 2106 | private = xt_unregister_table(table); |
1da177e4 LT |
2107 | |
2108 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2109 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2110 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2111 | cleanup_entry(iter, net); |
df200969 AD |
2112 | if (private->number > private->initial_entries) |
2113 | module_put(table_owner); | |
2e4e6a17 | 2114 | xt_free_table_info(private); |
1da177e4 LT |
2115 | } |
2116 | ||
2117 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2118 | static inline bool |
1da177e4 LT |
2119 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2120 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2121 | bool invert) |
1da177e4 | 2122 | { |
9c547959 PM |
2123 | return ((test_type == 0xFF) || |
2124 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2125 | ^ invert; |
2126 | } | |
2127 | ||
1d93a9cb | 2128 | static bool |
62fc8051 | 2129 | icmp_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2130 | { |
5452e425 JE |
2131 | const struct icmphdr *ic; |
2132 | struct icmphdr _icmph; | |
f7108a20 | 2133 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2134 | |
2135 | /* Must not be a fragment. */ | |
f7108a20 | 2136 | if (par->fragoff != 0) |
1d93a9cb | 2137 | return false; |
1da177e4 | 2138 | |
f7108a20 | 2139 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2140 | if (ic == NULL) { |
2141 | /* We've been asked to examine this packet, and we | |
2142 | * can't. Hence, no choice but to drop. | |
2143 | */ | |
2144 | duprintf("Dropping evil ICMP tinygram.\n"); | |
b4ba2611 | 2145 | par->hotdrop = true; |
1d93a9cb | 2146 | return false; |
1da177e4 LT |
2147 | } |
2148 | ||
2149 | return icmp_type_code_match(icmpinfo->type, | |
2150 | icmpinfo->code[0], | |
2151 | icmpinfo->code[1], | |
2152 | ic->type, ic->code, | |
2153 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2154 | } | |
2155 | ||
b0f38452 | 2156 | static int icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2157 | { |
9b4fce7a | 2158 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2159 | |
1d5cd909 | 2160 | /* Must specify no unknown invflags */ |
bd414ee6 | 2161 | return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2162 | } |
2163 | ||
4538506b JE |
2164 | static struct xt_target ipt_builtin_tg[] __read_mostly = { |
2165 | { | |
243bf6e2 | 2166 | .name = XT_STANDARD_TARGET, |
4538506b JE |
2167 | .targetsize = sizeof(int), |
2168 | .family = NFPROTO_IPV4, | |
2722971c | 2169 | #ifdef CONFIG_COMPAT |
4538506b JE |
2170 | .compatsize = sizeof(compat_int_t), |
2171 | .compat_from_user = compat_standard_from_user, | |
2172 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2173 | #endif |
4538506b JE |
2174 | }, |
2175 | { | |
243bf6e2 | 2176 | .name = XT_ERROR_TARGET, |
4538506b | 2177 | .target = ipt_error, |
12b00c2c | 2178 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
2179 | .family = NFPROTO_IPV4, |
2180 | }, | |
1da177e4 LT |
2181 | }; |
2182 | ||
2183 | static struct nf_sockopt_ops ipt_sockopts = { | |
2184 | .pf = PF_INET, | |
2185 | .set_optmin = IPT_BASE_CTL, | |
2186 | .set_optmax = IPT_SO_SET_MAX+1, | |
2187 | .set = do_ipt_set_ctl, | |
2722971c DM |
2188 | #ifdef CONFIG_COMPAT |
2189 | .compat_set = compat_do_ipt_set_ctl, | |
2190 | #endif | |
1da177e4 LT |
2191 | .get_optmin = IPT_BASE_CTL, |
2192 | .get_optmax = IPT_SO_GET_MAX+1, | |
2193 | .get = do_ipt_get_ctl, | |
2722971c DM |
2194 | #ifdef CONFIG_COMPAT |
2195 | .compat_get = compat_do_ipt_get_ctl, | |
2196 | #endif | |
16fcec35 | 2197 | .owner = THIS_MODULE, |
1da177e4 LT |
2198 | }; |
2199 | ||
4538506b JE |
2200 | static struct xt_match ipt_builtin_mt[] __read_mostly = { |
2201 | { | |
2202 | .name = "icmp", | |
2203 | .match = icmp_match, | |
2204 | .matchsize = sizeof(struct ipt_icmp), | |
2205 | .checkentry = icmp_checkentry, | |
2206 | .proto = IPPROTO_ICMP, | |
2207 | .family = NFPROTO_IPV4, | |
2208 | }, | |
1da177e4 LT |
2209 | }; |
2210 | ||
3cb609d5 AD |
2211 | static int __net_init ip_tables_net_init(struct net *net) |
2212 | { | |
383ca5b8 | 2213 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
2214 | } |
2215 | ||
2216 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2217 | { | |
383ca5b8 | 2218 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
2219 | } |
2220 | ||
2221 | static struct pernet_operations ip_tables_net_ops = { | |
2222 | .init = ip_tables_net_init, | |
2223 | .exit = ip_tables_net_exit, | |
2224 | }; | |
2225 | ||
65b4b4e8 | 2226 | static int __init ip_tables_init(void) |
1da177e4 LT |
2227 | { |
2228 | int ret; | |
2229 | ||
3cb609d5 | 2230 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2231 | if (ret < 0) |
2232 | goto err1; | |
2e4e6a17 | 2233 | |
25985edc | 2234 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 2235 | ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 PM |
2236 | if (ret < 0) |
2237 | goto err2; | |
4538506b | 2238 | ret = xt_register_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 PM |
2239 | if (ret < 0) |
2240 | goto err4; | |
1da177e4 LT |
2241 | |
2242 | /* Register setsockopt */ | |
2243 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2244 | if (ret < 0) |
2245 | goto err5; | |
1da177e4 | 2246 | |
ff67e4e4 | 2247 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2248 | return 0; |
0eff66e6 PM |
2249 | |
2250 | err5: | |
4538506b | 2251 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 | 2252 | err4: |
4538506b | 2253 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 | 2254 | err2: |
3cb609d5 | 2255 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2256 | err1: |
2257 | return ret; | |
1da177e4 LT |
2258 | } |
2259 | ||
65b4b4e8 | 2260 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2261 | { |
2262 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2263 | |
4538506b JE |
2264 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
2265 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); | |
3cb609d5 | 2266 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2267 | } |
2268 | ||
2269 | EXPORT_SYMBOL(ipt_register_table); | |
2270 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2271 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2272 | module_init(ip_tables_init); |
2273 | module_exit(ip_tables_fini); |