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) */ |
47901dc2 | 171 | static inline bool unconditional(const struct ipt_ip *ip) |
ba9dda3a | 172 | { |
47901dc2 | 173 | static const struct ipt_ip uncond; |
ba9dda3a | 174 | |
47901dc2 | 175 | return memcmp(ip, &uncond, sizeof(uncond)) == 0; |
e79ec50b | 176 | #undef FWINV |
ba9dda3a JK |
177 | } |
178 | ||
d5d1baa1 | 179 | /* for const-correctness */ |
87a2e70d | 180 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
181 | ipt_get_target_c(const struct ipt_entry *e) |
182 | { | |
183 | return ipt_get_target((struct ipt_entry *)e); | |
184 | } | |
185 | ||
f0165888 | 186 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
022748a9 | 187 | static const char *const hooknames[] = { |
6e23ae2a PM |
188 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
189 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 190 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
191 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
192 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
193 | }; |
194 | ||
195 | enum nf_ip_trace_comments { | |
196 | NF_IP_TRACE_COMMENT_RULE, | |
197 | NF_IP_TRACE_COMMENT_RETURN, | |
198 | NF_IP_TRACE_COMMENT_POLICY, | |
199 | }; | |
200 | ||
022748a9 | 201 | static const char *const comments[] = { |
ba9dda3a JK |
202 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
203 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
204 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
205 | }; | |
206 | ||
207 | static struct nf_loginfo trace_loginfo = { | |
208 | .type = NF_LOG_TYPE_LOG, | |
209 | .u = { | |
210 | .log = { | |
211 | .level = 4, | |
212 | .logflags = NF_LOG_MASK, | |
213 | }, | |
214 | }, | |
215 | }; | |
216 | ||
022748a9 | 217 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 218 | static inline int |
d5d1baa1 | 219 | get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e, |
4f2f6f23 JE |
220 | const char *hookname, const char **chainname, |
221 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 222 | { |
87a2e70d | 223 | const struct xt_standard_target *t = (void *)ipt_get_target_c(s); |
ba9dda3a | 224 | |
243bf6e2 | 225 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
226 | /* Head of user chain: ERROR target with chainname */ |
227 | *chainname = t->target.data; | |
228 | (*rulenum) = 0; | |
229 | } else if (s == e) { | |
230 | (*rulenum)++; | |
231 | ||
3666ed1c JP |
232 | if (s->target_offset == sizeof(struct ipt_entry) && |
233 | strcmp(t->target.u.kernel.target->name, | |
243bf6e2 | 234 | XT_STANDARD_TARGET) == 0 && |
3666ed1c JP |
235 | t->verdict < 0 && |
236 | unconditional(&s->ip)) { | |
ba9dda3a JK |
237 | /* Tail of chains: STANDARD target (return/policy) */ |
238 | *comment = *chainname == hookname | |
4f2f6f23 JE |
239 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
240 | : comments[NF_IP_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
241 | } |
242 | return 1; | |
243 | } else | |
244 | (*rulenum)++; | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
d5d1baa1 | 249 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
250 | unsigned int hook, |
251 | const struct net_device *in, | |
252 | const struct net_device *out, | |
ecb6f85e | 253 | const char *tablename, |
d5d1baa1 JE |
254 | const struct xt_table_info *private, |
255 | const struct ipt_entry *e) | |
ba9dda3a | 256 | { |
d5d1baa1 | 257 | const void *table_base; |
5452e425 | 258 | const struct ipt_entry *root; |
4f2f6f23 | 259 | const char *hookname, *chainname, *comment; |
72b2b1dd | 260 | const struct ipt_entry *iter; |
ba9dda3a | 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 | 329 | cpu = smp_processor_id(); |
b416c144 WD |
330 | /* |
331 | * Ensure we load private-> members after we've fetched the base | |
332 | * pointer. | |
333 | */ | |
334 | smp_read_barrier_depends(); | |
f3c5c1bf JE |
335 | table_base = private->entries[cpu]; |
336 | jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; | |
7489aec8 | 337 | stackptr = per_cpu_ptr(private->stackptr, cpu); |
f3c5c1bf | 338 | origptr = *stackptr; |
78454473 | 339 | |
2e4e6a17 | 340 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 341 | |
cecc74de | 342 | pr_debug("Entering %s(hook %u); sp at %u (UF %p)\n", |
f3c5c1bf JE |
343 | table->name, hook, origptr, |
344 | get_entry(table_base, private->underflow[hook])); | |
1da177e4 LT |
345 | |
346 | do { | |
87a2e70d | 347 | const struct xt_entry_target *t; |
dcea992a | 348 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 349 | |
1da177e4 | 350 | IP_NF_ASSERT(e); |
a1ff4ac8 | 351 | if (!ip_packet_match(ip, indev, outdev, |
de74c169 | 352 | &e->ip, acpar.fragoff)) { |
dcea992a | 353 | no_match: |
a1ff4ac8 JE |
354 | e = ipt_next_entry(e); |
355 | continue; | |
356 | } | |
1da177e4 | 357 | |
ef53d702 | 358 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
359 | acpar.match = ematch->u.kernel.match; |
360 | acpar.matchinfo = ematch->data; | |
361 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 362 | goto no_match; |
ef53d702 | 363 | } |
dcea992a | 364 | |
7df0884c | 365 | ADD_COUNTER(e->counters, skb->len, 1); |
1da177e4 | 366 | |
a1ff4ac8 JE |
367 | t = ipt_get_target(e); |
368 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a | 369 | |
f0165888 | 370 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
371 | /* The packet is traced: log it */ |
372 | if (unlikely(skb->nf_trace)) | |
373 | trace_packet(skb, hook, in, out, | |
374 | table->name, private, e); | |
ba9dda3a | 375 | #endif |
a1ff4ac8 JE |
376 | /* Standard target? */ |
377 | if (!t->u.kernel.target->target) { | |
378 | int v; | |
379 | ||
87a2e70d | 380 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
381 | if (v < 0) { |
382 | /* Pop from stack? */ | |
243bf6e2 | 383 | if (v != XT_RETURN) { |
95c96174 | 384 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 385 | break; |
1da177e4 | 386 | } |
db856674 | 387 | if (*stackptr <= origptr) { |
f3c5c1bf JE |
388 | e = get_entry(table_base, |
389 | private->underflow[hook]); | |
cecc74de | 390 | pr_debug("Underflow (this is normal) " |
f3c5c1bf JE |
391 | "to %p\n", e); |
392 | } else { | |
393 | e = jumpstack[--*stackptr]; | |
cecc74de | 394 | pr_debug("Pulled %p out from pos %u\n", |
f3c5c1bf JE |
395 | e, *stackptr); |
396 | e = ipt_next_entry(e); | |
397 | } | |
a1ff4ac8 JE |
398 | continue; |
399 | } | |
3666ed1c JP |
400 | if (table_base + v != ipt_next_entry(e) && |
401 | !(e->ip.flags & IPT_F_GOTO)) { | |
f3c5c1bf JE |
402 | if (*stackptr >= private->stacksize) { |
403 | verdict = NF_DROP; | |
404 | break; | |
405 | } | |
406 | jumpstack[(*stackptr)++] = e; | |
cecc74de | 407 | pr_debug("Pushed %p into pos %u\n", |
f3c5c1bf | 408 | e, *stackptr - 1); |
a1ff4ac8 | 409 | } |
1da177e4 | 410 | |
a1ff4ac8 | 411 | e = get_entry(table_base, v); |
7a6b1c46 JE |
412 | continue; |
413 | } | |
414 | ||
de74c169 JE |
415 | acpar.target = t->u.kernel.target; |
416 | acpar.targinfo = t->data; | |
bb70dfa5 | 417 | |
de74c169 | 418 | verdict = t->u.kernel.target->target(skb, &acpar); |
7a6b1c46 JE |
419 | /* Target might have changed stuff. */ |
420 | ip = ip_hdr(skb); | |
243bf6e2 | 421 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
422 | e = ipt_next_entry(e); |
423 | else | |
424 | /* Verdict */ | |
425 | break; | |
b4ba2611 | 426 | } while (!acpar.hotdrop); |
cecc74de | 427 | pr_debug("Exiting %s; resetting sp from %u to %u\n", |
f3c5c1bf JE |
428 | __func__, *stackptr, origptr); |
429 | *stackptr = origptr; | |
7f5c6d4f ED |
430 | xt_write_recseq_end(addend); |
431 | local_bh_enable(); | |
432 | ||
1da177e4 LT |
433 | #ifdef DEBUG_ALLOW_ALL |
434 | return NF_ACCEPT; | |
435 | #else | |
b4ba2611 | 436 | if (acpar.hotdrop) |
1da177e4 LT |
437 | return NF_DROP; |
438 | else return verdict; | |
439 | #endif | |
440 | } | |
441 | ||
1da177e4 LT |
442 | /* Figures out from what hook each rule can be called: returns 0 if |
443 | there are loops. Puts hook bitmask in comefrom. */ | |
444 | static int | |
d5d1baa1 | 445 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 446 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
447 | { |
448 | unsigned int hook; | |
449 | ||
450 | /* No recursion; use packet counter to save back ptrs (reset | |
451 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 452 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 453 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 454 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
455 | |
456 | if (!(valid_hooks & (1 << hook))) | |
457 | continue; | |
458 | ||
459 | /* Set initial back pointer. */ | |
460 | e->counters.pcnt = pos; | |
461 | ||
462 | for (;;) { | |
87a2e70d | 463 | const struct xt_standard_target *t |
d5d1baa1 | 464 | = (void *)ipt_get_target_c(e); |
e1b4b9f3 | 465 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 466 | |
6e23ae2a | 467 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
654d0fbd | 468 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
469 | hook, pos, e->comefrom); |
470 | return 0; | |
471 | } | |
9c547959 | 472 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
473 | |
474 | /* Unconditional return/END. */ | |
3666ed1c JP |
475 | if ((e->target_offset == sizeof(struct ipt_entry) && |
476 | (strcmp(t->target.u.user.name, | |
243bf6e2 | 477 | XT_STANDARD_TARGET) == 0) && |
3666ed1c JP |
478 | t->verdict < 0 && unconditional(&e->ip)) || |
479 | visited) { | |
1da177e4 LT |
480 | unsigned int oldpos, size; |
481 | ||
1f9352ae | 482 | if ((strcmp(t->target.u.user.name, |
243bf6e2 | 483 | XT_STANDARD_TARGET) == 0) && |
1f9352ae | 484 | t->verdict < -NF_MAX_VERDICT - 1) { |
74c9c0c1 DM |
485 | duprintf("mark_source_chains: bad " |
486 | "negative verdict (%i)\n", | |
487 | t->verdict); | |
488 | return 0; | |
489 | } | |
490 | ||
1da177e4 LT |
491 | /* Return: backtrack through the last |
492 | big jump. */ | |
493 | do { | |
6e23ae2a | 494 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
495 | #ifdef DEBUG_IP_FIREWALL_USER |
496 | if (e->comefrom | |
6e23ae2a | 497 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
498 | duprintf("Back unset " |
499 | "on hook %u " | |
500 | "rule %u\n", | |
501 | hook, pos); | |
502 | } | |
503 | #endif | |
504 | oldpos = pos; | |
505 | pos = e->counters.pcnt; | |
506 | e->counters.pcnt = 0; | |
507 | ||
508 | /* We're at the start. */ | |
509 | if (pos == oldpos) | |
510 | goto next; | |
511 | ||
512 | e = (struct ipt_entry *) | |
31836064 | 513 | (entry0 + pos); |
1da177e4 LT |
514 | } while (oldpos == pos + e->next_offset); |
515 | ||
516 | /* Move along one */ | |
517 | size = e->next_offset; | |
518 | e = (struct ipt_entry *) | |
31836064 | 519 | (entry0 + pos + size); |
1da177e4 LT |
520 | e->counters.pcnt = pos; |
521 | pos += size; | |
522 | } else { | |
523 | int newpos = t->verdict; | |
524 | ||
525 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 526 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 527 | newpos >= 0) { |
74c9c0c1 DM |
528 | if (newpos > newinfo->size - |
529 | sizeof(struct ipt_entry)) { | |
530 | duprintf("mark_source_chains: " | |
531 | "bad verdict (%i)\n", | |
532 | newpos); | |
533 | return 0; | |
534 | } | |
1da177e4 LT |
535 | /* This a jump; chase it. */ |
536 | duprintf("Jump rule %u -> %u\n", | |
537 | pos, newpos); | |
538 | } else { | |
539 | /* ... this is a fallthru */ | |
540 | newpos = pos + e->next_offset; | |
541 | } | |
542 | e = (struct ipt_entry *) | |
31836064 | 543 | (entry0 + newpos); |
1da177e4 LT |
544 | e->counters.pcnt = pos; |
545 | pos = newpos; | |
546 | } | |
547 | } | |
548 | next: | |
549 | duprintf("Finished chain %u\n", hook); | |
550 | } | |
551 | return 1; | |
552 | } | |
553 | ||
87a2e70d | 554 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 555 | { |
6be3d859 JE |
556 | struct xt_mtdtor_param par; |
557 | ||
f54e9367 | 558 | par.net = net; |
6be3d859 JE |
559 | par.match = m->u.kernel.match; |
560 | par.matchinfo = m->data; | |
916a917d | 561 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
562 | if (par.match->destroy != NULL) |
563 | par.match->destroy(&par); | |
564 | module_put(par.match->me); | |
1da177e4 LT |
565 | } |
566 | ||
022748a9 | 567 | static int |
d5d1baa1 | 568 | check_entry(const struct ipt_entry *e, const char *name) |
a96be246 | 569 | { |
87a2e70d | 570 | const struct xt_entry_target *t; |
a96be246 DM |
571 | |
572 | if (!ip_checkentry(&e->ip)) { | |
63f6fe92 | 573 | duprintf("ip check failed %p %s.\n", e, name); |
a96be246 DM |
574 | return -EINVAL; |
575 | } | |
576 | ||
87a2e70d | 577 | if (e->target_offset + sizeof(struct xt_entry_target) > |
9c547959 | 578 | e->next_offset) |
a96be246 DM |
579 | return -EINVAL; |
580 | ||
d5d1baa1 | 581 | t = ipt_get_target_c(e); |
a96be246 DM |
582 | if (e->target_offset + t->u.target_size > e->next_offset) |
583 | return -EINVAL; | |
584 | ||
585 | return 0; | |
586 | } | |
587 | ||
022748a9 | 588 | static int |
87a2e70d | 589 | check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
a96be246 | 590 | { |
9b4fce7a | 591 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 DM |
592 | int ret; |
593 | ||
9b4fce7a JE |
594 | par->match = m->u.kernel.match; |
595 | par->matchinfo = m->data; | |
596 | ||
916a917d | 597 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 598 | ip->proto, ip->invflags & IPT_INV_PROTO); |
367c6790 | 599 | if (ret < 0) { |
b5cad0df | 600 | duprintf("check failed for `%s'.\n", par->match->name); |
367c6790 | 601 | return ret; |
a96be246 | 602 | } |
367c6790 | 603 | return 0; |
a96be246 DM |
604 | } |
605 | ||
022748a9 | 606 | static int |
87a2e70d | 607 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 608 | { |
6709dbbb | 609 | struct xt_match *match; |
3cdc7c95 | 610 | int ret; |
1da177e4 | 611 | |
fd0ec0e6 JE |
612 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
613 | m->u.user.revision); | |
614 | if (IS_ERR(match)) { | |
a96be246 | 615 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 616 | return PTR_ERR(match); |
1da177e4 LT |
617 | } |
618 | m->u.kernel.match = match; | |
619 | ||
6bdb331b | 620 | ret = check_match(m, par); |
3cdc7c95 PM |
621 | if (ret) |
622 | goto err; | |
623 | ||
1da177e4 | 624 | return 0; |
3cdc7c95 PM |
625 | err: |
626 | module_put(m->u.kernel.match->me); | |
627 | return ret; | |
1da177e4 LT |
628 | } |
629 | ||
add67461 | 630 | static int check_target(struct ipt_entry *e, struct net *net, const char *name) |
a96be246 | 631 | { |
87a2e70d | 632 | struct xt_entry_target *t = ipt_get_target(e); |
af5d6dc2 | 633 | struct xt_tgchk_param par = { |
add67461 | 634 | .net = net, |
af5d6dc2 JE |
635 | .table = name, |
636 | .entryinfo = e, | |
637 | .target = t->u.kernel.target, | |
638 | .targinfo = t->data, | |
639 | .hook_mask = e->comefrom, | |
916a917d | 640 | .family = NFPROTO_IPV4, |
af5d6dc2 | 641 | }; |
e905a9ed | 642 | int ret; |
a96be246 | 643 | |
916a917d | 644 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 645 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
367c6790 | 646 | if (ret < 0) { |
ff67e4e4 | 647 | duprintf("check failed for `%s'.\n", |
a96be246 | 648 | t->u.kernel.target->name); |
367c6790 | 649 | return ret; |
a96be246 | 650 | } |
367c6790 | 651 | return 0; |
a96be246 | 652 | } |
1da177e4 | 653 | |
022748a9 | 654 | static int |
a83d8e8d | 655 | find_check_entry(struct ipt_entry *e, struct net *net, const char *name, |
0559518b | 656 | unsigned int size) |
1da177e4 | 657 | { |
87a2e70d | 658 | struct xt_entry_target *t; |
6709dbbb | 659 | struct xt_target *target; |
1da177e4 LT |
660 | int ret; |
661 | unsigned int j; | |
9b4fce7a | 662 | struct xt_mtchk_param mtpar; |
dcea992a | 663 | struct xt_entry_match *ematch; |
1da177e4 | 664 | |
a96be246 DM |
665 | ret = check_entry(e, name); |
666 | if (ret) | |
667 | return ret; | |
590bdf7f | 668 | |
1da177e4 | 669 | j = 0; |
a83d8e8d | 670 | mtpar.net = net; |
9b4fce7a JE |
671 | mtpar.table = name; |
672 | mtpar.entryinfo = &e->ip; | |
673 | mtpar.hook_mask = e->comefrom; | |
916a917d | 674 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 675 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 676 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 677 | if (ret != 0) |
6bdb331b JE |
678 | goto cleanup_matches; |
679 | ++j; | |
dcea992a | 680 | } |
1da177e4 LT |
681 | |
682 | t = ipt_get_target(e); | |
d2a7b6ba JE |
683 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
684 | t->u.user.revision); | |
685 | if (IS_ERR(target)) { | |
a96be246 | 686 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 687 | ret = PTR_ERR(target); |
1da177e4 LT |
688 | goto cleanup_matches; |
689 | } | |
690 | t->u.kernel.target = target; | |
691 | ||
add67461 | 692 | ret = check_target(e, net, name); |
3cdc7c95 PM |
693 | if (ret) |
694 | goto err; | |
1da177e4 | 695 | return 0; |
3cdc7c95 PM |
696 | err: |
697 | module_put(t->u.kernel.target->me); | |
1da177e4 | 698 | cleanup_matches: |
6bdb331b JE |
699 | xt_ematch_foreach(ematch, e) { |
700 | if (j-- == 0) | |
dcea992a | 701 | break; |
6bdb331b JE |
702 | cleanup_match(ematch, net); |
703 | } | |
1da177e4 LT |
704 | return ret; |
705 | } | |
706 | ||
d5d1baa1 | 707 | static bool check_underflow(const struct ipt_entry *e) |
e2fe35c1 | 708 | { |
87a2e70d | 709 | const struct xt_entry_target *t; |
e2fe35c1 JE |
710 | unsigned int verdict; |
711 | ||
712 | if (!unconditional(&e->ip)) | |
713 | return false; | |
d5d1baa1 | 714 | t = ipt_get_target_c(e); |
e2fe35c1 JE |
715 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
716 | return false; | |
87a2e70d | 717 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
718 | verdict = -verdict - 1; |
719 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
720 | } | |
721 | ||
022748a9 | 722 | static int |
1da177e4 | 723 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 724 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
725 | const unsigned char *base, |
726 | const unsigned char *limit, | |
1da177e4 LT |
727 | const unsigned int *hook_entries, |
728 | const unsigned int *underflows, | |
0559518b | 729 | unsigned int valid_hooks) |
1da177e4 LT |
730 | { |
731 | unsigned int h; | |
732 | ||
3666ed1c JP |
733 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 || |
734 | (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { | |
1da177e4 LT |
735 | duprintf("Bad offset %p\n", e); |
736 | return -EINVAL; | |
737 | } | |
738 | ||
739 | if (e->next_offset | |
87a2e70d | 740 | < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target)) { |
1da177e4 LT |
741 | duprintf("checking: element %p size %u\n", |
742 | e, e->next_offset); | |
743 | return -EINVAL; | |
744 | } | |
745 | ||
746 | /* Check hooks & underflows */ | |
6e23ae2a | 747 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
748 | if (!(valid_hooks & (1 << h))) |
749 | continue; | |
1da177e4 LT |
750 | if ((unsigned char *)e - base == hook_entries[h]) |
751 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 752 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
753 | if (!check_underflow(e)) { |
754 | pr_err("Underflows must be unconditional and " | |
755 | "use the STANDARD target with " | |
756 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
757 | return -EINVAL; |
758 | } | |
1da177e4 | 759 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 760 | } |
1da177e4 LT |
761 | } |
762 | ||
1da177e4 | 763 | /* Clear counters and comefrom */ |
2e4e6a17 | 764 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 765 | e->comefrom = 0; |
1da177e4 LT |
766 | return 0; |
767 | } | |
768 | ||
0559518b JE |
769 | static void |
770 | cleanup_entry(struct ipt_entry *e, struct net *net) | |
1da177e4 | 771 | { |
a2df1648 | 772 | struct xt_tgdtor_param par; |
87a2e70d | 773 | struct xt_entry_target *t; |
dcea992a | 774 | struct xt_entry_match *ematch; |
1da177e4 | 775 | |
1da177e4 | 776 | /* Cleanup all matches */ |
dcea992a | 777 | xt_ematch_foreach(ematch, e) |
6bdb331b | 778 | cleanup_match(ematch, net); |
1da177e4 | 779 | t = ipt_get_target(e); |
a2df1648 | 780 | |
add67461 | 781 | par.net = net; |
a2df1648 JE |
782 | par.target = t->u.kernel.target; |
783 | par.targinfo = t->data; | |
916a917d | 784 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
785 | if (par.target->destroy != NULL) |
786 | par.target->destroy(&par); | |
787 | module_put(par.target->me); | |
1da177e4 LT |
788 | } |
789 | ||
790 | /* Checks and translates the user-supplied table segment (held in | |
791 | newinfo) */ | |
792 | static int | |
0f234214 JE |
793 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
794 | const struct ipt_replace *repl) | |
1da177e4 | 795 | { |
72b2b1dd | 796 | struct ipt_entry *iter; |
1da177e4 | 797 | unsigned int i; |
72b2b1dd | 798 | int ret = 0; |
1da177e4 | 799 | |
0f234214 JE |
800 | newinfo->size = repl->size; |
801 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
802 | |
803 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 804 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
805 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
806 | newinfo->underflow[i] = 0xFFFFFFFF; | |
807 | } | |
808 | ||
809 | duprintf("translate_table: size %u\n", newinfo->size); | |
810 | i = 0; | |
811 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
812 | xt_entry_foreach(iter, entry0, newinfo->size) { |
813 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
814 | entry0 + repl->size, |
815 | repl->hook_entry, | |
816 | repl->underflow, | |
817 | repl->valid_hooks); | |
72b2b1dd | 818 | if (ret != 0) |
0559518b JE |
819 | return ret; |
820 | ++i; | |
f3c5c1bf JE |
821 | if (strcmp(ipt_get_target(iter)->u.user.name, |
822 | XT_ERROR_TARGET) == 0) | |
823 | ++newinfo->stacksize; | |
72b2b1dd | 824 | } |
1da177e4 | 825 | |
0f234214 | 826 | if (i != repl->num_entries) { |
1da177e4 | 827 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 828 | i, repl->num_entries); |
1da177e4 LT |
829 | return -EINVAL; |
830 | } | |
831 | ||
832 | /* Check hooks all assigned */ | |
6e23ae2a | 833 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 834 | /* Only hooks which are valid */ |
0f234214 | 835 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
836 | continue; |
837 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
838 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 839 | i, repl->hook_entry[i]); |
1da177e4 LT |
840 | return -EINVAL; |
841 | } | |
842 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
843 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 844 | i, repl->underflow[i]); |
1da177e4 LT |
845 | return -EINVAL; |
846 | } | |
847 | } | |
848 | ||
0f234214 | 849 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
850 | return -ELOOP; |
851 | ||
1da177e4 LT |
852 | /* Finally, each sanity check must pass */ |
853 | i = 0; | |
72b2b1dd | 854 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 855 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
856 | if (ret != 0) |
857 | break; | |
0559518b | 858 | ++i; |
72b2b1dd | 859 | } |
1da177e4 | 860 | |
74c9c0c1 | 861 | if (ret != 0) { |
0559518b JE |
862 | xt_entry_foreach(iter, entry0, newinfo->size) { |
863 | if (i-- == 0) | |
72b2b1dd | 864 | break; |
0559518b JE |
865 | cleanup_entry(iter, net); |
866 | } | |
74c9c0c1 DM |
867 | return ret; |
868 | } | |
1da177e4 LT |
869 | |
870 | /* And one copy for every other CPU */ | |
6f912042 | 871 | for_each_possible_cpu(i) { |
31836064 ED |
872 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
873 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
874 | } |
875 | ||
876 | return ret; | |
877 | } | |
878 | ||
1da177e4 | 879 | static void |
2e4e6a17 HW |
880 | get_counters(const struct xt_table_info *t, |
881 | struct xt_counters counters[]) | |
1da177e4 | 882 | { |
72b2b1dd | 883 | struct ipt_entry *iter; |
1da177e4 LT |
884 | unsigned int cpu; |
885 | unsigned int i; | |
886 | ||
6f912042 | 887 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 888 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 889 | |
1da177e4 | 890 | i = 0; |
0559518b | 891 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
83723d60 ED |
892 | u64 bcnt, pcnt; |
893 | unsigned int start; | |
894 | ||
895 | do { | |
7f5c6d4f | 896 | start = read_seqcount_begin(s); |
83723d60 ED |
897 | bcnt = iter->counters.bcnt; |
898 | pcnt = iter->counters.pcnt; | |
7f5c6d4f | 899 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
900 | |
901 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
902 | ++i; /* macro does multi eval of i */ |
903 | } | |
1da177e4 | 904 | } |
78454473 SH |
905 | } |
906 | ||
d5d1baa1 | 907 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 908 | { |
2722971c | 909 | unsigned int countersize; |
2e4e6a17 | 910 | struct xt_counters *counters; |
d5d1baa1 | 911 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
912 | |
913 | /* We need atomic snapshot of counters: rest doesn't change | |
914 | (other than comefrom, which userspace doesn't care | |
915 | about). */ | |
2e4e6a17 | 916 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 917 | counters = vzalloc(countersize); |
1da177e4 LT |
918 | |
919 | if (counters == NULL) | |
942e4a2b | 920 | return ERR_PTR(-ENOMEM); |
78454473 | 921 | |
942e4a2b | 922 | get_counters(private, counters); |
1da177e4 | 923 | |
2722971c DM |
924 | return counters; |
925 | } | |
926 | ||
927 | static int | |
928 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 929 | const struct xt_table *table, |
2722971c DM |
930 | void __user *userptr) |
931 | { | |
932 | unsigned int off, num; | |
d5d1baa1 | 933 | const struct ipt_entry *e; |
2722971c | 934 | struct xt_counters *counters; |
5452e425 | 935 | const struct xt_table_info *private = table->private; |
2722971c | 936 | int ret = 0; |
5452e425 | 937 | const void *loc_cpu_entry; |
2722971c DM |
938 | |
939 | counters = alloc_counters(table); | |
940 | if (IS_ERR(counters)) | |
941 | return PTR_ERR(counters); | |
942 | ||
31836064 ED |
943 | /* choose the copy that is on our node/cpu, ... |
944 | * This choice is lazy (because current thread is | |
945 | * allowed to migrate to another cpu) | |
946 | */ | |
2e4e6a17 | 947 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 948 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
949 | ret = -EFAULT; |
950 | goto free_counters; | |
951 | } | |
952 | ||
953 | /* FIXME: use iterator macros --RR */ | |
954 | /* ... then go back and fix counters and names */ | |
955 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
956 | unsigned int i; | |
87a2e70d JE |
957 | const struct xt_entry_match *m; |
958 | const struct xt_entry_target *t; | |
1da177e4 | 959 | |
31836064 | 960 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
961 | if (copy_to_user(userptr + off |
962 | + offsetof(struct ipt_entry, counters), | |
963 | &counters[num], | |
964 | sizeof(counters[num])) != 0) { | |
965 | ret = -EFAULT; | |
966 | goto free_counters; | |
967 | } | |
968 | ||
969 | for (i = sizeof(struct ipt_entry); | |
970 | i < e->target_offset; | |
971 | i += m->u.match_size) { | |
972 | m = (void *)e + i; | |
973 | ||
974 | if (copy_to_user(userptr + off + i | |
87a2e70d | 975 | + offsetof(struct xt_entry_match, |
1da177e4 LT |
976 | u.user.name), |
977 | m->u.kernel.match->name, | |
978 | strlen(m->u.kernel.match->name)+1) | |
979 | != 0) { | |
980 | ret = -EFAULT; | |
981 | goto free_counters; | |
982 | } | |
983 | } | |
984 | ||
d5d1baa1 | 985 | t = ipt_get_target_c(e); |
1da177e4 | 986 | if (copy_to_user(userptr + off + e->target_offset |
87a2e70d | 987 | + offsetof(struct xt_entry_target, |
1da177e4 LT |
988 | u.user.name), |
989 | t->u.kernel.target->name, | |
990 | strlen(t->u.kernel.target->name)+1) != 0) { | |
991 | ret = -EFAULT; | |
992 | goto free_counters; | |
993 | } | |
994 | } | |
995 | ||
996 | free_counters: | |
997 | vfree(counters); | |
998 | return ret; | |
999 | } | |
1000 | ||
2722971c | 1001 | #ifdef CONFIG_COMPAT |
739674fb | 1002 | static void compat_standard_from_user(void *dst, const void *src) |
2722971c | 1003 | { |
9fa492cd | 1004 | int v = *(compat_int_t *)src; |
2722971c | 1005 | |
9fa492cd | 1006 | if (v > 0) |
b386d9f5 | 1007 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1008 | memcpy(dst, &v, sizeof(v)); |
1009 | } | |
46c5ea3c | 1010 | |
739674fb | 1011 | static int compat_standard_to_user(void __user *dst, const void *src) |
2722971c | 1012 | { |
9fa492cd | 1013 | compat_int_t cv = *(int *)src; |
2722971c | 1014 | |
9fa492cd | 1015 | if (cv > 0) |
b386d9f5 | 1016 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1017 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1018 | } |
1019 | ||
d5d1baa1 | 1020 | static int compat_calc_entry(const struct ipt_entry *e, |
4b478248 | 1021 | const struct xt_table_info *info, |
d5d1baa1 | 1022 | const void *base, struct xt_table_info *newinfo) |
2722971c | 1023 | { |
dcea992a | 1024 | const struct xt_entry_match *ematch; |
87a2e70d | 1025 | const struct xt_entry_target *t; |
e5b5ef7d | 1026 | unsigned int entry_offset; |
2722971c DM |
1027 | int off, i, ret; |
1028 | ||
30c08c41 | 1029 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c | 1030 | entry_offset = (void *)e - base; |
dcea992a | 1031 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1032 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1033 | t = ipt_get_target_c(e); |
9fa492cd | 1034 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1035 | newinfo->size -= off; |
b386d9f5 | 1036 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1037 | if (ret) |
1038 | return ret; | |
1039 | ||
6e23ae2a | 1040 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1041 | if (info->hook_entry[i] && |
1042 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1043 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1044 | if (info->underflow[i] && |
1045 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1046 | newinfo->underflow[i] -= off; |
1047 | } | |
1048 | return 0; | |
1049 | } | |
1050 | ||
259d4e41 | 1051 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1052 | struct xt_table_info *newinfo) |
2722971c | 1053 | { |
72b2b1dd | 1054 | struct ipt_entry *iter; |
2722971c | 1055 | void *loc_cpu_entry; |
0559518b | 1056 | int ret; |
2722971c DM |
1057 | |
1058 | if (!newinfo || !info) | |
1059 | return -EINVAL; | |
1060 | ||
259d4e41 ED |
1061 | /* we dont care about newinfo->entries[] */ |
1062 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1063 | newinfo->initial_entries = 0; | |
2722971c | 1064 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
255d0dc3 | 1065 | xt_compat_init_offsets(AF_INET, info->number); |
72b2b1dd JE |
1066 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1067 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1068 | if (ret != 0) | |
0559518b | 1069 | return ret; |
72b2b1dd | 1070 | } |
0559518b | 1071 | return 0; |
2722971c DM |
1072 | } |
1073 | #endif | |
1074 | ||
d5d1baa1 JE |
1075 | static int get_info(struct net *net, void __user *user, |
1076 | const int *len, int compat) | |
2722971c | 1077 | { |
12b00c2c | 1078 | char name[XT_TABLE_MAXNAMELEN]; |
e60a13e0 | 1079 | struct xt_table *t; |
2722971c DM |
1080 | int ret; |
1081 | ||
1082 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1083 | duprintf("length %u != %zu\n", *len, |
1084 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1085 | return -EINVAL; |
1086 | } | |
1087 | ||
1088 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1089 | return -EFAULT; | |
1090 | ||
12b00c2c | 1091 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
2722971c DM |
1092 | #ifdef CONFIG_COMPAT |
1093 | if (compat) | |
1094 | xt_compat_lock(AF_INET); | |
1095 | #endif | |
34bd137b | 1096 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1097 | "iptable_%s", name); |
0cc8d8df | 1098 | if (!IS_ERR_OR_NULL(t)) { |
2722971c | 1099 | struct ipt_getinfo info; |
5452e425 | 1100 | const struct xt_table_info *private = t->private; |
2722971c | 1101 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1102 | struct xt_table_info tmp; |
1103 | ||
2722971c | 1104 | if (compat) { |
2722971c | 1105 | ret = compat_table_info(private, &tmp); |
b386d9f5 | 1106 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1107 | private = &tmp; |
2722971c DM |
1108 | } |
1109 | #endif | |
b5f15ac4 | 1110 | memset(&info, 0, sizeof(info)); |
2722971c DM |
1111 | info.valid_hooks = t->valid_hooks; |
1112 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1113 | sizeof(info.hook_entry)); |
2722971c | 1114 | memcpy(info.underflow, private->underflow, |
4b478248 | 1115 | sizeof(info.underflow)); |
2722971c DM |
1116 | info.num_entries = private->number; |
1117 | info.size = private->size; | |
1118 | strcpy(info.name, name); | |
1119 | ||
1120 | if (copy_to_user(user, &info, *len) != 0) | |
1121 | ret = -EFAULT; | |
1122 | else | |
1123 | ret = 0; | |
1124 | ||
1125 | xt_table_unlock(t); | |
1126 | module_put(t->me); | |
1127 | } else | |
1128 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1129 | #ifdef CONFIG_COMPAT | |
1130 | if (compat) | |
1131 | xt_compat_unlock(AF_INET); | |
1132 | #endif | |
1133 | return ret; | |
1134 | } | |
1135 | ||
1136 | static int | |
d5d1baa1 JE |
1137 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
1138 | const int *len) | |
2722971c DM |
1139 | { |
1140 | int ret; | |
1141 | struct ipt_get_entries get; | |
e60a13e0 | 1142 | struct xt_table *t; |
2722971c DM |
1143 | |
1144 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1145 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1146 | return -EINVAL; |
1147 | } | |
1148 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1149 | return -EFAULT; | |
1150 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1151 | duprintf("get_entries: %u != %zu\n", |
1152 | *len, sizeof(get) + get.size); | |
2722971c DM |
1153 | return -EINVAL; |
1154 | } | |
1155 | ||
34bd137b | 1156 | t = xt_find_table_lock(net, AF_INET, get.name); |
0cc8d8df | 1157 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1158 | const struct xt_table_info *private = t->private; |
9c547959 | 1159 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1160 | if (get.size == private->size) |
1161 | ret = copy_entries_to_user(private->size, | |
1162 | t, uptr->entrytable); | |
1163 | else { | |
1164 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1165 | private->size, get.size); |
544473c1 | 1166 | ret = -EAGAIN; |
2722971c DM |
1167 | } |
1168 | module_put(t->me); | |
1169 | xt_table_unlock(t); | |
1170 | } else | |
1171 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1172 | ||
1173 | return ret; | |
1174 | } | |
1175 | ||
1176 | static int | |
34bd137b | 1177 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1178 | struct xt_table_info *newinfo, unsigned int num_counters, |
1179 | void __user *counters_ptr) | |
2722971c DM |
1180 | { |
1181 | int ret; | |
e60a13e0 | 1182 | struct xt_table *t; |
2722971c DM |
1183 | struct xt_table_info *oldinfo; |
1184 | struct xt_counters *counters; | |
1185 | void *loc_cpu_old_entry; | |
72b2b1dd | 1186 | struct ipt_entry *iter; |
2722971c DM |
1187 | |
1188 | ret = 0; | |
83723d60 | 1189 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
2722971c DM |
1190 | if (!counters) { |
1191 | ret = -ENOMEM; | |
1192 | goto out; | |
1193 | } | |
1194 | ||
34bd137b | 1195 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c | 1196 | "iptable_%s", name); |
0cc8d8df | 1197 | if (IS_ERR_OR_NULL(t)) { |
2722971c DM |
1198 | ret = t ? PTR_ERR(t) : -ENOENT; |
1199 | goto free_newinfo_counters_untrans; | |
1200 | } | |
1201 | ||
1202 | /* You lied! */ | |
1203 | if (valid_hooks != t->valid_hooks) { | |
1204 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1205 | valid_hooks, t->valid_hooks); | |
1206 | ret = -EINVAL; | |
1207 | goto put_module; | |
1208 | } | |
1209 | ||
1210 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1211 | if (!oldinfo) | |
1212 | goto put_module; | |
1213 | ||
1214 | /* Update module usage count based on number of rules */ | |
1215 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1216 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1217 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1218 | (newinfo->number <= oldinfo->initial_entries)) | |
1219 | module_put(t->me); | |
1220 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1221 | (newinfo->number <= oldinfo->initial_entries)) | |
1222 | module_put(t->me); | |
1223 | ||
942e4a2b | 1224 | /* Get the old counters, and synchronize with replace */ |
2722971c | 1225 | get_counters(oldinfo, counters); |
942e4a2b | 1226 | |
2722971c DM |
1227 | /* Decrease module usage counts and free resource */ |
1228 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
72b2b1dd | 1229 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1230 | cleanup_entry(iter, net); |
72b2b1dd | 1231 | |
2722971c DM |
1232 | xt_free_table_info(oldinfo); |
1233 | if (copy_to_user(counters_ptr, counters, | |
1234 | sizeof(struct xt_counters) * num_counters) != 0) | |
1235 | ret = -EFAULT; | |
1236 | vfree(counters); | |
1237 | xt_table_unlock(t); | |
1238 | return ret; | |
1239 | ||
1240 | put_module: | |
1241 | module_put(t->me); | |
1242 | xt_table_unlock(t); | |
1243 | free_newinfo_counters_untrans: | |
1244 | vfree(counters); | |
1245 | out: | |
1246 | return ret; | |
1247 | } | |
1248 | ||
1249 | static int | |
d5d1baa1 | 1250 | do_replace(struct net *net, const void __user *user, unsigned int len) |
2722971c DM |
1251 | { |
1252 | int ret; | |
1253 | struct ipt_replace tmp; | |
1254 | struct xt_table_info *newinfo; | |
1255 | void *loc_cpu_entry; | |
72b2b1dd | 1256 | struct ipt_entry *iter; |
2722971c DM |
1257 | |
1258 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1259 | return -EFAULT; | |
1260 | ||
2722971c | 1261 | /* overflow check */ |
2722971c DM |
1262 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1263 | return -ENOMEM; | |
78b79876 | 1264 | tmp.name[sizeof(tmp.name)-1] = 0; |
2722971c DM |
1265 | |
1266 | newinfo = xt_alloc_table_info(tmp.size); | |
1267 | if (!newinfo) | |
1268 | return -ENOMEM; | |
1269 | ||
9c547959 | 1270 | /* choose the copy that is on our node/cpu */ |
2722971c DM |
1271 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1272 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1273 | tmp.size) != 0) { | |
1274 | ret = -EFAULT; | |
1275 | goto free_newinfo; | |
1276 | } | |
1277 | ||
0f234214 | 1278 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
2722971c DM |
1279 | if (ret != 0) |
1280 | goto free_newinfo; | |
1281 | ||
ff67e4e4 | 1282 | duprintf("Translated table\n"); |
2722971c | 1283 | |
34bd137b | 1284 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1285 | tmp.num_counters, tmp.counters); |
2722971c DM |
1286 | if (ret) |
1287 | goto free_newinfo_untrans; | |
1288 | return 0; | |
1289 | ||
1290 | free_newinfo_untrans: | |
72b2b1dd | 1291 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1292 | cleanup_entry(iter, net); |
2722971c DM |
1293 | free_newinfo: |
1294 | xt_free_table_info(newinfo); | |
1295 | return ret; | |
1296 | } | |
1297 | ||
2722971c | 1298 | static int |
d5d1baa1 JE |
1299 | do_add_counters(struct net *net, const void __user *user, |
1300 | unsigned int len, int compat) | |
2722971c | 1301 | { |
942e4a2b | 1302 | unsigned int i, curcpu; |
2722971c DM |
1303 | struct xt_counters_info tmp; |
1304 | struct xt_counters *paddc; | |
1305 | unsigned int num_counters; | |
5452e425 | 1306 | const char *name; |
2722971c DM |
1307 | int size; |
1308 | void *ptmp; | |
e60a13e0 | 1309 | struct xt_table *t; |
5452e425 | 1310 | const struct xt_table_info *private; |
2722971c DM |
1311 | int ret = 0; |
1312 | void *loc_cpu_entry; | |
72b2b1dd | 1313 | struct ipt_entry *iter; |
7f5c6d4f | 1314 | unsigned int addend; |
2722971c DM |
1315 | #ifdef CONFIG_COMPAT |
1316 | struct compat_xt_counters_info compat_tmp; | |
1317 | ||
1318 | if (compat) { | |
1319 | ptmp = &compat_tmp; | |
1320 | size = sizeof(struct compat_xt_counters_info); | |
1321 | } else | |
1322 | #endif | |
1323 | { | |
1324 | ptmp = &tmp; | |
1325 | size = sizeof(struct xt_counters_info); | |
1326 | } | |
1327 | ||
1328 | if (copy_from_user(ptmp, user, size) != 0) | |
1329 | return -EFAULT; | |
1330 | ||
1331 | #ifdef CONFIG_COMPAT | |
1332 | if (compat) { | |
1333 | num_counters = compat_tmp.num_counters; | |
1334 | name = compat_tmp.name; | |
1335 | } else | |
1336 | #endif | |
1337 | { | |
1338 | num_counters = tmp.num_counters; | |
1339 | name = tmp.name; | |
1340 | } | |
1341 | ||
1342 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1343 | return -EINVAL; | |
1344 | ||
e12f8e29 | 1345 | paddc = vmalloc(len - size); |
2722971c DM |
1346 | if (!paddc) |
1347 | return -ENOMEM; | |
1348 | ||
1349 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1350 | ret = -EFAULT; | |
1351 | goto free; | |
1352 | } | |
1353 | ||
34bd137b | 1354 | t = xt_find_table_lock(net, AF_INET, name); |
0cc8d8df | 1355 | if (IS_ERR_OR_NULL(t)) { |
2722971c DM |
1356 | ret = t ? PTR_ERR(t) : -ENOENT; |
1357 | goto free; | |
1358 | } | |
1359 | ||
942e4a2b | 1360 | local_bh_disable(); |
2722971c DM |
1361 | private = t->private; |
1362 | if (private->number != num_counters) { | |
1363 | ret = -EINVAL; | |
1364 | goto unlock_up_free; | |
1365 | } | |
1366 | ||
1367 | i = 0; | |
1368 | /* Choose the copy that is on our node */ | |
942e4a2b SH |
1369 | curcpu = smp_processor_id(); |
1370 | loc_cpu_entry = private->entries[curcpu]; | |
7f5c6d4f | 1371 | addend = xt_write_recseq_begin(); |
0559518b JE |
1372 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1373 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1374 | ++i; | |
1375 | } | |
7f5c6d4f | 1376 | xt_write_recseq_end(addend); |
2722971c | 1377 | unlock_up_free: |
942e4a2b | 1378 | local_bh_enable(); |
2722971c DM |
1379 | xt_table_unlock(t); |
1380 | module_put(t->me); | |
1381 | free: | |
1382 | vfree(paddc); | |
1383 | ||
1384 | return ret; | |
1385 | } | |
1386 | ||
1387 | #ifdef CONFIG_COMPAT | |
1388 | struct compat_ipt_replace { | |
12b00c2c | 1389 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1390 | u32 valid_hooks; |
1391 | u32 num_entries; | |
1392 | u32 size; | |
6e23ae2a PM |
1393 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1394 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c | 1395 | u32 num_counters; |
87a2e70d | 1396 | compat_uptr_t counters; /* struct xt_counters * */ |
2722971c DM |
1397 | struct compat_ipt_entry entries[0]; |
1398 | }; | |
1399 | ||
a18aa31b PM |
1400 | static int |
1401 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1402 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1403 | unsigned int i) |
2722971c | 1404 | { |
87a2e70d | 1405 | struct xt_entry_target *t; |
2722971c DM |
1406 | struct compat_ipt_entry __user *ce; |
1407 | u_int16_t target_offset, next_offset; | |
1408 | compat_uint_t origsize; | |
dcea992a JE |
1409 | const struct xt_entry_match *ematch; |
1410 | int ret = 0; | |
2722971c | 1411 | |
2722971c DM |
1412 | origsize = *size; |
1413 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
0559518b JE |
1414 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
1415 | copy_to_user(&ce->counters, &counters[i], | |
1416 | sizeof(counters[i])) != 0) | |
1417 | return -EFAULT; | |
a18aa31b | 1418 | |
2722971c | 1419 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1420 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1421 | ||
dcea992a JE |
1422 | xt_ematch_foreach(ematch, e) { |
1423 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1424 | if (ret != 0) | |
6bdb331b | 1425 | return ret; |
dcea992a | 1426 | } |
2722971c | 1427 | target_offset = e->target_offset - (origsize - *size); |
2722971c | 1428 | t = ipt_get_target(e); |
9fa492cd | 1429 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c | 1430 | if (ret) |
0559518b | 1431 | return ret; |
2722971c | 1432 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1433 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1434 | put_user(next_offset, &ce->next_offset) != 0) | |
1435 | return -EFAULT; | |
2722971c | 1436 | return 0; |
2722971c DM |
1437 | } |
1438 | ||
022748a9 | 1439 | static int |
87a2e70d | 1440 | compat_find_calc_match(struct xt_entry_match *m, |
4b478248 PM |
1441 | const char *name, |
1442 | const struct ipt_ip *ip, | |
1443 | unsigned int hookmask, | |
6bdb331b | 1444 | int *size) |
2722971c | 1445 | { |
6709dbbb | 1446 | struct xt_match *match; |
2722971c | 1447 | |
fd0ec0e6 JE |
1448 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
1449 | m->u.user.revision); | |
1450 | if (IS_ERR(match)) { | |
2722971c | 1451 | duprintf("compat_check_calc_match: `%s' not found\n", |
4b478248 | 1452 | m->u.user.name); |
fd0ec0e6 | 1453 | return PTR_ERR(match); |
2722971c DM |
1454 | } |
1455 | m->u.kernel.match = match; | |
9fa492cd | 1456 | *size += xt_compat_match_offset(match); |
4c1b52bc DM |
1457 | return 0; |
1458 | } | |
1459 | ||
0559518b | 1460 | static void compat_release_entry(struct compat_ipt_entry *e) |
4c1b52bc | 1461 | { |
87a2e70d | 1462 | struct xt_entry_target *t; |
dcea992a | 1463 | struct xt_entry_match *ematch; |
4c1b52bc | 1464 | |
4c1b52bc | 1465 | /* Cleanup all matches */ |
dcea992a | 1466 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1467 | module_put(ematch->u.kernel.match->me); |
73cd598d | 1468 | t = compat_ipt_get_target(e); |
4c1b52bc | 1469 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1470 | } |
1471 | ||
022748a9 | 1472 | static int |
73cd598d | 1473 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1474 | struct xt_table_info *newinfo, |
1475 | unsigned int *size, | |
d5d1baa1 JE |
1476 | const unsigned char *base, |
1477 | const unsigned char *limit, | |
1478 | const unsigned int *hook_entries, | |
1479 | const unsigned int *underflows, | |
4b478248 | 1480 | const char *name) |
2722971c | 1481 | { |
dcea992a | 1482 | struct xt_entry_match *ematch; |
87a2e70d | 1483 | struct xt_entry_target *t; |
6709dbbb | 1484 | struct xt_target *target; |
e5b5ef7d | 1485 | unsigned int entry_offset; |
b0a6363c PM |
1486 | unsigned int j; |
1487 | int ret, off, h; | |
2722971c DM |
1488 | |
1489 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1490 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
1491 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { | |
2722971c DM |
1492 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1493 | return -EINVAL; | |
1494 | } | |
1495 | ||
1496 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1497 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1498 | duprintf("checking: element %p size %u\n", |
1499 | e, e->next_offset); | |
1500 | return -EINVAL; | |
1501 | } | |
1502 | ||
73cd598d PM |
1503 | /* For purposes of check_entry casting the compat entry is fine */ |
1504 | ret = check_entry((struct ipt_entry *)e, name); | |
a96be246 DM |
1505 | if (ret) |
1506 | return ret; | |
590bdf7f | 1507 | |
30c08c41 | 1508 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1509 | entry_offset = (void *)e - (void *)base; |
1510 | j = 0; | |
dcea992a JE |
1511 | xt_ematch_foreach(ematch, e) { |
1512 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1513 | &e->ip, e->comefrom, &off); |
dcea992a | 1514 | if (ret != 0) |
6bdb331b JE |
1515 | goto release_matches; |
1516 | ++j; | |
dcea992a | 1517 | } |
2722971c | 1518 | |
73cd598d | 1519 | t = compat_ipt_get_target(e); |
d2a7b6ba JE |
1520 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
1521 | t->u.user.revision); | |
1522 | if (IS_ERR(target)) { | |
a96be246 | 1523 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1524 | t->u.user.name); |
d2a7b6ba | 1525 | ret = PTR_ERR(target); |
4c1b52bc | 1526 | goto release_matches; |
2722971c DM |
1527 | } |
1528 | t->u.kernel.target = target; | |
1529 | ||
9fa492cd | 1530 | off += xt_compat_target_offset(target); |
2722971c | 1531 | *size += off; |
b386d9f5 | 1532 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1533 | if (ret) |
1534 | goto out; | |
1535 | ||
1536 | /* Check hooks & underflows */ | |
6e23ae2a | 1537 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1538 | if ((unsigned char *)e - base == hook_entries[h]) |
1539 | newinfo->hook_entry[h] = hook_entries[h]; | |
1540 | if ((unsigned char *)e - base == underflows[h]) | |
1541 | newinfo->underflow[h] = underflows[h]; | |
1542 | } | |
1543 | ||
1544 | /* Clear counters and comefrom */ | |
73cd598d | 1545 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c | 1546 | e->comefrom = 0; |
2722971c | 1547 | return 0; |
bec71b16 | 1548 | |
2722971c | 1549 | out: |
bec71b16 | 1550 | module_put(t->u.kernel.target->me); |
4c1b52bc | 1551 | release_matches: |
6bdb331b JE |
1552 | xt_ematch_foreach(ematch, e) { |
1553 | if (j-- == 0) | |
dcea992a | 1554 | break; |
6bdb331b JE |
1555 | module_put(ematch->u.kernel.match->me); |
1556 | } | |
2722971c DM |
1557 | return ret; |
1558 | } | |
1559 | ||
4b478248 | 1560 | static int |
73cd598d | 1561 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1562 | unsigned int *size, const char *name, |
1563 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c | 1564 | { |
87a2e70d | 1565 | struct xt_entry_target *t; |
6709dbbb | 1566 | struct xt_target *target; |
2722971c DM |
1567 | struct ipt_entry *de; |
1568 | unsigned int origsize; | |
920b868a | 1569 | int ret, h; |
dcea992a | 1570 | struct xt_entry_match *ematch; |
2722971c DM |
1571 | |
1572 | ret = 0; | |
1573 | origsize = *size; | |
1574 | de = (struct ipt_entry *)*dstptr; | |
1575 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1576 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1577 | |
73cd598d | 1578 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1579 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1580 | ||
dcea992a JE |
1581 | xt_ematch_foreach(ematch, e) { |
1582 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1583 | if (ret != 0) | |
6bdb331b | 1584 | return ret; |
dcea992a | 1585 | } |
2722971c | 1586 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1587 | t = compat_ipt_get_target(e); |
2722971c | 1588 | target = t->u.kernel.target; |
9fa492cd | 1589 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1590 | |
1591 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1592 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1593 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1594 | newinfo->hook_entry[h] -= origsize - *size; | |
1595 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1596 | newinfo->underflow[h] -= origsize - *size; | |
1597 | } | |
f6677f43 DM |
1598 | return ret; |
1599 | } | |
1600 | ||
022748a9 | 1601 | static int |
0559518b | 1602 | compat_check_entry(struct ipt_entry *e, struct net *net, const char *name) |
f6677f43 | 1603 | { |
dcea992a | 1604 | struct xt_entry_match *ematch; |
9b4fce7a | 1605 | struct xt_mtchk_param mtpar; |
b0a6363c | 1606 | unsigned int j; |
dcea992a | 1607 | int ret = 0; |
f6677f43 | 1608 | |
4c1b52bc | 1609 | j = 0; |
a83d8e8d | 1610 | mtpar.net = net; |
9b4fce7a JE |
1611 | mtpar.table = name; |
1612 | mtpar.entryinfo = &e->ip; | |
1613 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1614 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 1615 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1616 | ret = check_match(ematch, &mtpar); |
dcea992a | 1617 | if (ret != 0) |
6bdb331b JE |
1618 | goto cleanup_matches; |
1619 | ++j; | |
dcea992a | 1620 | } |
4c1b52bc | 1621 | |
add67461 | 1622 | ret = check_target(e, net, name); |
4c1b52bc DM |
1623 | if (ret) |
1624 | goto cleanup_matches; | |
4c1b52bc DM |
1625 | return 0; |
1626 | ||
1627 | cleanup_matches: | |
6bdb331b JE |
1628 | xt_ematch_foreach(ematch, e) { |
1629 | if (j-- == 0) | |
dcea992a | 1630 | break; |
6bdb331b JE |
1631 | cleanup_match(ematch, net); |
1632 | } | |
4c1b52bc | 1633 | return ret; |
f6677f43 DM |
1634 | } |
1635 | ||
1da177e4 | 1636 | static int |
a83d8e8d AD |
1637 | translate_compat_table(struct net *net, |
1638 | const char *name, | |
4b478248 PM |
1639 | unsigned int valid_hooks, |
1640 | struct xt_table_info **pinfo, | |
1641 | void **pentry0, | |
1642 | unsigned int total_size, | |
1643 | unsigned int number, | |
1644 | unsigned int *hook_entries, | |
1645 | unsigned int *underflows) | |
1da177e4 | 1646 | { |
920b868a | 1647 | unsigned int i, j; |
2722971c DM |
1648 | struct xt_table_info *newinfo, *info; |
1649 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1650 | struct compat_ipt_entry *iter0; |
1651 | struct ipt_entry *iter1; | |
2722971c | 1652 | unsigned int size; |
0559518b | 1653 | int ret; |
1da177e4 | 1654 | |
2722971c DM |
1655 | info = *pinfo; |
1656 | entry0 = *pentry0; | |
1657 | size = total_size; | |
1658 | info->number = number; | |
1659 | ||
1660 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1661 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1662 | info->hook_entry[i] = 0xFFFFFFFF; |
1663 | info->underflow[i] = 0xFFFFFFFF; | |
1664 | } | |
1665 | ||
1666 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1667 | j = 0; |
2722971c | 1668 | xt_compat_lock(AF_INET); |
255d0dc3 | 1669 | xt_compat_init_offsets(AF_INET, number); |
2722971c | 1670 | /* Walk through entries, checking offsets. */ |
72b2b1dd JE |
1671 | xt_entry_foreach(iter0, entry0, total_size) { |
1672 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1673 | entry0, |
1674 | entry0 + total_size, | |
1675 | hook_entries, | |
1676 | underflows, | |
1677 | name); | |
72b2b1dd | 1678 | if (ret != 0) |
0559518b JE |
1679 | goto out_unlock; |
1680 | ++j; | |
72b2b1dd | 1681 | } |
2722971c DM |
1682 | |
1683 | ret = -EINVAL; | |
920b868a | 1684 | if (j != number) { |
2722971c | 1685 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1686 | j, number); |
2722971c DM |
1687 | goto out_unlock; |
1688 | } | |
1689 | ||
1690 | /* Check hooks all assigned */ | |
6e23ae2a | 1691 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1692 | /* Only hooks which are valid */ |
1693 | if (!(valid_hooks & (1 << i))) | |
1694 | continue; | |
1695 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1696 | duprintf("Invalid hook entry %u %u\n", | |
1697 | i, hook_entries[i]); | |
1698 | goto out_unlock; | |
1da177e4 | 1699 | } |
2722971c DM |
1700 | if (info->underflow[i] == 0xFFFFFFFF) { |
1701 | duprintf("Invalid underflow %u %u\n", | |
1702 | i, underflows[i]); | |
1703 | goto out_unlock; | |
1704 | } | |
1705 | } | |
1706 | ||
1707 | ret = -ENOMEM; | |
1708 | newinfo = xt_alloc_table_info(size); | |
1709 | if (!newinfo) | |
1710 | goto out_unlock; | |
1711 | ||
1712 | newinfo->number = number; | |
6e23ae2a | 1713 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1714 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1715 | newinfo->underflow[i] = info->underflow[i]; | |
1716 | } | |
1717 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1718 | pos = entry1; | |
4b478248 | 1719 | size = total_size; |
72b2b1dd | 1720 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1721 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1722 | name, newinfo, entry1); | |
72b2b1dd JE |
1723 | if (ret != 0) |
1724 | break; | |
1725 | } | |
b386d9f5 | 1726 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1727 | xt_compat_unlock(AF_INET); |
1728 | if (ret) | |
1729 | goto free_newinfo; | |
1730 | ||
1731 | ret = -ELOOP; | |
1732 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1733 | goto free_newinfo; | |
1734 | ||
4c1b52bc | 1735 | i = 0; |
72b2b1dd | 1736 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1737 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1738 | if (ret != 0) |
1739 | break; | |
0559518b | 1740 | ++i; |
cca77b7c FW |
1741 | if (strcmp(ipt_get_target(iter1)->u.user.name, |
1742 | XT_ERROR_TARGET) == 0) | |
1743 | ++newinfo->stacksize; | |
72b2b1dd | 1744 | } |
4c1b52bc | 1745 | if (ret) { |
72b2b1dd JE |
1746 | /* |
1747 | * The first i matches need cleanup_entry (calls ->destroy) | |
1748 | * because they had called ->check already. The other j-i | |
1749 | * entries need only release. | |
1750 | */ | |
1751 | int skip = i; | |
4c1b52bc | 1752 | j -= i; |
72b2b1dd JE |
1753 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1754 | if (skip-- > 0) | |
1755 | continue; | |
0559518b | 1756 | if (j-- == 0) |
72b2b1dd | 1757 | break; |
0559518b | 1758 | compat_release_entry(iter0); |
72b2b1dd | 1759 | } |
0559518b JE |
1760 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1761 | if (i-- == 0) | |
72b2b1dd | 1762 | break; |
0559518b JE |
1763 | cleanup_entry(iter1, net); |
1764 | } | |
4c1b52bc DM |
1765 | xt_free_table_info(newinfo); |
1766 | return ret; | |
1767 | } | |
f6677f43 | 1768 | |
2722971c | 1769 | /* And one copy for every other CPU */ |
fb1bb34d | 1770 | for_each_possible_cpu(i) |
2722971c DM |
1771 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1772 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1773 | ||
1774 | *pinfo = newinfo; | |
1775 | *pentry0 = entry1; | |
1776 | xt_free_table_info(info); | |
1777 | return 0; | |
1da177e4 | 1778 | |
2722971c DM |
1779 | free_newinfo: |
1780 | xt_free_table_info(newinfo); | |
1781 | out: | |
0559518b JE |
1782 | xt_entry_foreach(iter0, entry0, total_size) { |
1783 | if (j-- == 0) | |
72b2b1dd | 1784 | break; |
0559518b JE |
1785 | compat_release_entry(iter0); |
1786 | } | |
1da177e4 | 1787 | return ret; |
2722971c | 1788 | out_unlock: |
b386d9f5 | 1789 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1790 | xt_compat_unlock(AF_INET); |
1791 | goto out; | |
1da177e4 LT |
1792 | } |
1793 | ||
1794 | static int | |
34bd137b | 1795 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1796 | { |
1797 | int ret; | |
2722971c DM |
1798 | struct compat_ipt_replace tmp; |
1799 | struct xt_table_info *newinfo; | |
1800 | void *loc_cpu_entry; | |
72b2b1dd | 1801 | struct ipt_entry *iter; |
1da177e4 LT |
1802 | |
1803 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1804 | return -EFAULT; | |
1805 | ||
ee4bb818 | 1806 | /* overflow check */ |
259d4e41 | 1807 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1808 | return -ENOMEM; |
1809 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1810 | return -ENOMEM; | |
78b79876 | 1811 | tmp.name[sizeof(tmp.name)-1] = 0; |
ee4bb818 | 1812 | |
2e4e6a17 | 1813 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1814 | if (!newinfo) |
1815 | return -ENOMEM; | |
1816 | ||
9c547959 | 1817 | /* choose the copy that is on our node/cpu */ |
31836064 ED |
1818 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1819 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1820 | tmp.size) != 0) { |
1821 | ret = -EFAULT; | |
1822 | goto free_newinfo; | |
1823 | } | |
1824 | ||
a83d8e8d | 1825 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
4b478248 PM |
1826 | &newinfo, &loc_cpu_entry, tmp.size, |
1827 | tmp.num_entries, tmp.hook_entry, | |
1828 | tmp.underflow); | |
2722971c | 1829 | if (ret != 0) |
1da177e4 | 1830 | goto free_newinfo; |
1da177e4 | 1831 | |
2722971c | 1832 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1833 | |
34bd137b | 1834 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1835 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1836 | if (ret) |
1837 | goto free_newinfo_untrans; | |
1838 | return 0; | |
1da177e4 | 1839 | |
2722971c | 1840 | free_newinfo_untrans: |
72b2b1dd | 1841 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1842 | cleanup_entry(iter, net); |
2722971c DM |
1843 | free_newinfo: |
1844 | xt_free_table_info(newinfo); | |
1845 | return ret; | |
1846 | } | |
1da177e4 | 1847 | |
2722971c DM |
1848 | static int |
1849 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1850 | unsigned int len) |
2722971c DM |
1851 | { |
1852 | int ret; | |
1da177e4 | 1853 | |
52e804c6 | 1854 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
2722971c | 1855 | return -EPERM; |
1da177e4 | 1856 | |
2722971c DM |
1857 | switch (cmd) { |
1858 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1859 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1860 | break; |
1da177e4 | 1861 | |
2722971c | 1862 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1863 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1864 | break; |
1865 | ||
1866 | default: | |
1867 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1868 | ret = -EINVAL; | |
1869 | } | |
1da177e4 | 1870 | |
1da177e4 LT |
1871 | return ret; |
1872 | } | |
1873 | ||
4b478248 | 1874 | struct compat_ipt_get_entries { |
12b00c2c | 1875 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1876 | compat_uint_t size; |
1877 | struct compat_ipt_entry entrytable[0]; | |
1878 | }; | |
1da177e4 | 1879 | |
4b478248 PM |
1880 | static int |
1881 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1882 | void __user *userptr) | |
2722971c | 1883 | { |
2722971c | 1884 | struct xt_counters *counters; |
5452e425 | 1885 | const struct xt_table_info *private = table->private; |
2722971c DM |
1886 | void __user *pos; |
1887 | unsigned int size; | |
1888 | int ret = 0; | |
5452e425 | 1889 | const void *loc_cpu_entry; |
a18aa31b | 1890 | unsigned int i = 0; |
72b2b1dd | 1891 | struct ipt_entry *iter; |
1da177e4 | 1892 | |
2722971c DM |
1893 | counters = alloc_counters(table); |
1894 | if (IS_ERR(counters)) | |
1895 | return PTR_ERR(counters); | |
1896 | ||
1897 | /* choose the copy that is on our node/cpu, ... | |
1898 | * This choice is lazy (because current thread is | |
1899 | * allowed to migrate to another cpu) | |
1900 | */ | |
1901 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1902 | pos = userptr; | |
1903 | size = total_size; | |
72b2b1dd JE |
1904 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1905 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1906 | &size, counters, i++); |
72b2b1dd JE |
1907 | if (ret != 0) |
1908 | break; | |
1909 | } | |
2722971c | 1910 | |
2722971c DM |
1911 | vfree(counters); |
1912 | return ret; | |
1da177e4 LT |
1913 | } |
1914 | ||
1915 | static int | |
34bd137b AD |
1916 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1917 | int *len) | |
1da177e4 | 1918 | { |
2722971c DM |
1919 | int ret; |
1920 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1921 | struct xt_table *t; |
1da177e4 | 1922 | |
2722971c | 1923 | if (*len < sizeof(get)) { |
c9d8fe13 | 1924 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1925 | return -EINVAL; |
2722971c | 1926 | } |
1da177e4 | 1927 | |
2722971c DM |
1928 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1929 | return -EFAULT; | |
1da177e4 | 1930 | |
2722971c | 1931 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1932 | duprintf("compat_get_entries: %u != %zu\n", |
1933 | *len, sizeof(get) + get.size); | |
2722971c | 1934 | return -EINVAL; |
1da177e4 LT |
1935 | } |
1936 | ||
2722971c | 1937 | xt_compat_lock(AF_INET); |
34bd137b | 1938 | t = xt_find_table_lock(net, AF_INET, get.name); |
0cc8d8df | 1939 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1940 | const struct xt_table_info *private = t->private; |
2722971c | 1941 | struct xt_table_info info; |
9c547959 | 1942 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1943 | ret = compat_table_info(private, &info); |
1944 | if (!ret && get.size == info.size) { | |
1945 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 1946 | t, uptr->entrytable); |
2722971c DM |
1947 | } else if (!ret) { |
1948 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1949 | private->size, get.size); |
544473c1 | 1950 | ret = -EAGAIN; |
2722971c | 1951 | } |
b386d9f5 | 1952 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1953 | module_put(t->me); |
1954 | xt_table_unlock(t); | |
1955 | } else | |
1da177e4 | 1956 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1957 | |
2722971c DM |
1958 | xt_compat_unlock(AF_INET); |
1959 | return ret; | |
1960 | } | |
1da177e4 | 1961 | |
79030ed0 PM |
1962 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1963 | ||
2722971c DM |
1964 | static int |
1965 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1966 | { | |
1967 | int ret; | |
1da177e4 | 1968 | |
52e804c6 | 1969 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
82fac054 BS |
1970 | return -EPERM; |
1971 | ||
2722971c DM |
1972 | switch (cmd) { |
1973 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1974 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1975 | break; |
1976 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1977 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1978 | break; |
1979 | default: | |
79030ed0 | 1980 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1981 | } |
1da177e4 LT |
1982 | return ret; |
1983 | } | |
2722971c | 1984 | #endif |
1da177e4 LT |
1985 | |
1986 | static int | |
9c547959 | 1987 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
1988 | { |
1989 | int ret; | |
1990 | ||
52e804c6 | 1991 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1992 | return -EPERM; |
1993 | ||
1994 | switch (cmd) { | |
1995 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1996 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1997 | break; |
1998 | ||
1999 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2000 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2001 | break; |
2002 | ||
2003 | default: | |
2004 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
2005 | ret = -EINVAL; | |
2006 | } | |
2007 | ||
2008 | return ret; | |
2009 | } | |
2010 | ||
2011 | static int | |
2012 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2013 | { | |
2014 | int ret; | |
2015 | ||
52e804c6 | 2016 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2017 | return -EPERM; |
2018 | ||
2019 | switch (cmd) { | |
2722971c | 2020 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2021 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2022 | break; |
1da177e4 | 2023 | |
2722971c | 2024 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2025 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2026 | break; |
1da177e4 LT |
2027 | |
2028 | case IPT_SO_GET_REVISION_MATCH: | |
2029 | case IPT_SO_GET_REVISION_TARGET: { | |
12b00c2c | 2030 | struct xt_get_revision rev; |
2e4e6a17 | 2031 | int target; |
1da177e4 LT |
2032 | |
2033 | if (*len != sizeof(rev)) { | |
2034 | ret = -EINVAL; | |
2035 | break; | |
2036 | } | |
2037 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2038 | ret = -EFAULT; | |
2039 | break; | |
2040 | } | |
78b79876 | 2041 | rev.name[sizeof(rev.name)-1] = 0; |
1da177e4 LT |
2042 | |
2043 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2044 | target = 1; |
1da177e4 | 2045 | else |
2e4e6a17 | 2046 | target = 0; |
1da177e4 | 2047 | |
2e4e6a17 HW |
2048 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2049 | rev.revision, | |
2050 | target, &ret), | |
1da177e4 LT |
2051 | "ipt_%s", rev.name); |
2052 | break; | |
2053 | } | |
2054 | ||
2055 | default: | |
2056 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2057 | ret = -EINVAL; | |
2058 | } | |
2059 | ||
2060 | return ret; | |
2061 | } | |
2062 | ||
35aad0ff JE |
2063 | struct xt_table *ipt_register_table(struct net *net, |
2064 | const struct xt_table *table, | |
44d34e72 | 2065 | const struct ipt_replace *repl) |
1da177e4 LT |
2066 | { |
2067 | int ret; | |
2e4e6a17 | 2068 | struct xt_table_info *newinfo; |
f3c5c1bf | 2069 | struct xt_table_info bootstrap = {0}; |
31836064 | 2070 | void *loc_cpu_entry; |
a98da11d | 2071 | struct xt_table *new_table; |
1da177e4 | 2072 | |
2e4e6a17 | 2073 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2074 | if (!newinfo) { |
2075 | ret = -ENOMEM; | |
2076 | goto out; | |
2077 | } | |
1da177e4 | 2078 | |
9c547959 | 2079 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2080 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2081 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2082 | |
0f234214 | 2083 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2084 | if (ret != 0) |
2085 | goto out_free; | |
1da177e4 | 2086 | |
44d34e72 | 2087 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2088 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2089 | ret = PTR_ERR(new_table); |
2090 | goto out_free; | |
1da177e4 LT |
2091 | } |
2092 | ||
44d34e72 AD |
2093 | return new_table; |
2094 | ||
2095 | out_free: | |
2096 | xt_free_table_info(newinfo); | |
2097 | out: | |
2098 | return ERR_PTR(ret); | |
1da177e4 LT |
2099 | } |
2100 | ||
f54e9367 | 2101 | void ipt_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2102 | { |
2e4e6a17 | 2103 | struct xt_table_info *private; |
31836064 | 2104 | void *loc_cpu_entry; |
df200969 | 2105 | struct module *table_owner = table->me; |
72b2b1dd | 2106 | struct ipt_entry *iter; |
31836064 | 2107 | |
e905a9ed | 2108 | private = xt_unregister_table(table); |
1da177e4 LT |
2109 | |
2110 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2111 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2112 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2113 | cleanup_entry(iter, net); |
df200969 AD |
2114 | if (private->number > private->initial_entries) |
2115 | module_put(table_owner); | |
2e4e6a17 | 2116 | xt_free_table_info(private); |
1da177e4 LT |
2117 | } |
2118 | ||
2119 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2120 | static inline bool |
1da177e4 LT |
2121 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2122 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2123 | bool invert) |
1da177e4 | 2124 | { |
9c547959 PM |
2125 | return ((test_type == 0xFF) || |
2126 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2127 | ^ invert; |
2128 | } | |
2129 | ||
1d93a9cb | 2130 | static bool |
62fc8051 | 2131 | icmp_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2132 | { |
5452e425 JE |
2133 | const struct icmphdr *ic; |
2134 | struct icmphdr _icmph; | |
f7108a20 | 2135 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2136 | |
2137 | /* Must not be a fragment. */ | |
f7108a20 | 2138 | if (par->fragoff != 0) |
1d93a9cb | 2139 | return false; |
1da177e4 | 2140 | |
f7108a20 | 2141 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2142 | if (ic == NULL) { |
2143 | /* We've been asked to examine this packet, and we | |
2144 | * can't. Hence, no choice but to drop. | |
2145 | */ | |
2146 | duprintf("Dropping evil ICMP tinygram.\n"); | |
b4ba2611 | 2147 | par->hotdrop = true; |
1d93a9cb | 2148 | return false; |
1da177e4 LT |
2149 | } |
2150 | ||
2151 | return icmp_type_code_match(icmpinfo->type, | |
2152 | icmpinfo->code[0], | |
2153 | icmpinfo->code[1], | |
2154 | ic->type, ic->code, | |
2155 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2156 | } | |
2157 | ||
b0f38452 | 2158 | static int icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2159 | { |
9b4fce7a | 2160 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2161 | |
1d5cd909 | 2162 | /* Must specify no unknown invflags */ |
bd414ee6 | 2163 | return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2164 | } |
2165 | ||
4538506b JE |
2166 | static struct xt_target ipt_builtin_tg[] __read_mostly = { |
2167 | { | |
243bf6e2 | 2168 | .name = XT_STANDARD_TARGET, |
4538506b JE |
2169 | .targetsize = sizeof(int), |
2170 | .family = NFPROTO_IPV4, | |
2722971c | 2171 | #ifdef CONFIG_COMPAT |
4538506b JE |
2172 | .compatsize = sizeof(compat_int_t), |
2173 | .compat_from_user = compat_standard_from_user, | |
2174 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2175 | #endif |
4538506b JE |
2176 | }, |
2177 | { | |
243bf6e2 | 2178 | .name = XT_ERROR_TARGET, |
4538506b | 2179 | .target = ipt_error, |
12b00c2c | 2180 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
2181 | .family = NFPROTO_IPV4, |
2182 | }, | |
1da177e4 LT |
2183 | }; |
2184 | ||
2185 | static struct nf_sockopt_ops ipt_sockopts = { | |
2186 | .pf = PF_INET, | |
2187 | .set_optmin = IPT_BASE_CTL, | |
2188 | .set_optmax = IPT_SO_SET_MAX+1, | |
2189 | .set = do_ipt_set_ctl, | |
2722971c DM |
2190 | #ifdef CONFIG_COMPAT |
2191 | .compat_set = compat_do_ipt_set_ctl, | |
2192 | #endif | |
1da177e4 LT |
2193 | .get_optmin = IPT_BASE_CTL, |
2194 | .get_optmax = IPT_SO_GET_MAX+1, | |
2195 | .get = do_ipt_get_ctl, | |
2722971c DM |
2196 | #ifdef CONFIG_COMPAT |
2197 | .compat_get = compat_do_ipt_get_ctl, | |
2198 | #endif | |
16fcec35 | 2199 | .owner = THIS_MODULE, |
1da177e4 LT |
2200 | }; |
2201 | ||
4538506b JE |
2202 | static struct xt_match ipt_builtin_mt[] __read_mostly = { |
2203 | { | |
2204 | .name = "icmp", | |
2205 | .match = icmp_match, | |
2206 | .matchsize = sizeof(struct ipt_icmp), | |
2207 | .checkentry = icmp_checkentry, | |
2208 | .proto = IPPROTO_ICMP, | |
2209 | .family = NFPROTO_IPV4, | |
2210 | }, | |
1da177e4 LT |
2211 | }; |
2212 | ||
3cb609d5 AD |
2213 | static int __net_init ip_tables_net_init(struct net *net) |
2214 | { | |
383ca5b8 | 2215 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
2216 | } |
2217 | ||
2218 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2219 | { | |
383ca5b8 | 2220 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
2221 | } |
2222 | ||
2223 | static struct pernet_operations ip_tables_net_ops = { | |
2224 | .init = ip_tables_net_init, | |
2225 | .exit = ip_tables_net_exit, | |
2226 | }; | |
2227 | ||
65b4b4e8 | 2228 | static int __init ip_tables_init(void) |
1da177e4 LT |
2229 | { |
2230 | int ret; | |
2231 | ||
3cb609d5 | 2232 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2233 | if (ret < 0) |
2234 | goto err1; | |
2e4e6a17 | 2235 | |
25985edc | 2236 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 2237 | ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 PM |
2238 | if (ret < 0) |
2239 | goto err2; | |
4538506b | 2240 | ret = xt_register_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 PM |
2241 | if (ret < 0) |
2242 | goto err4; | |
1da177e4 LT |
2243 | |
2244 | /* Register setsockopt */ | |
2245 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2246 | if (ret < 0) |
2247 | goto err5; | |
1da177e4 | 2248 | |
ff67e4e4 | 2249 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2250 | return 0; |
0eff66e6 PM |
2251 | |
2252 | err5: | |
4538506b | 2253 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 | 2254 | err4: |
4538506b | 2255 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 | 2256 | err2: |
3cb609d5 | 2257 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2258 | err1: |
2259 | return ret; | |
1da177e4 LT |
2260 | } |
2261 | ||
65b4b4e8 | 2262 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2263 | { |
2264 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2265 | |
4538506b JE |
2266 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
2267 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); | |
3cb609d5 | 2268 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2269 | } |
2270 | ||
2271 | EXPORT_SYMBOL(ipt_register_table); | |
2272 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2273 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2274 | module_init(ip_tables_init); |
2275 | module_exit(ip_tables_fini); |