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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Packet matching code. | |
4 | * | |
5 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
2e4e6a17 | 6 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
f229f6ce | 7 | * Copyright (C) 2006-2010 Patrick McHardy <kaber@trash.net> |
1da177e4 | 8 | */ |
90e7d4ab | 9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
1da177e4 | 10 | #include <linux/cache.h> |
4fc268d2 | 11 | #include <linux/capability.h> |
1da177e4 LT |
12 | #include <linux/skbuff.h> |
13 | #include <linux/kmod.h> | |
14 | #include <linux/vmalloc.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/module.h> | |
1da177e4 | 17 | #include <net/ip.h> |
2722971c | 18 | #include <net/compat.h> |
7c0f6ba6 | 19 | #include <linux/uaccess.h> |
57b47a53 | 20 | #include <linux/mutex.h> |
1da177e4 LT |
21 | #include <linux/proc_fs.h> |
22 | #include <linux/err.h> | |
c8923c6b | 23 | #include <linux/cpumask.h> |
1da177e4 | 24 | |
2e4e6a17 | 25 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 26 | #include <linux/netfilter_ipv4/ip_tables.h> |
f01ffbd6 | 27 | #include <net/netfilter/nf_log.h> |
e3eaa991 | 28 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
29 | |
30 | MODULE_LICENSE("GPL"); | |
31 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
32 | MODULE_DESCRIPTION("IPv4 packet filter"); | |
33 | ||
e3eaa991 JE |
34 | void *ipt_alloc_initial_table(const struct xt_table *info) |
35 | { | |
36 | return xt_alloc_initial_table(ipt, IPT); | |
37 | } | |
38 | EXPORT_SYMBOL_GPL(ipt_alloc_initial_table); | |
39 | ||
1da177e4 | 40 | /* Returns whether matches rule or not. */ |
022748a9 | 41 | /* Performance critical - called for every packet */ |
9c547959 | 42 | static inline bool |
1da177e4 LT |
43 | ip_packet_match(const struct iphdr *ip, |
44 | const char *indev, | |
45 | const char *outdev, | |
46 | const struct ipt_ip *ipinfo, | |
47 | int isfrag) | |
48 | { | |
1da177e4 LT |
49 | unsigned long ret; |
50 | ||
c37a2dfa JP |
51 | if (NF_INVF(ipinfo, IPT_INV_SRCIP, |
52 | (ip->saddr & ipinfo->smsk.s_addr) != ipinfo->src.s_addr) || | |
53 | NF_INVF(ipinfo, IPT_INV_DSTIP, | |
54 | (ip->daddr & ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr)) | |
9c547959 | 55 | return false; |
1da177e4 | 56 | |
b8dfe498 | 57 | ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask); |
1da177e4 | 58 | |
c37a2dfa | 59 | if (NF_INVF(ipinfo, IPT_INV_VIA_IN, ret != 0)) |
9c547959 | 60 | return false; |
1da177e4 | 61 | |
b8dfe498 | 62 | ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
1da177e4 | 63 | |
c37a2dfa | 64 | if (NF_INVF(ipinfo, IPT_INV_VIA_OUT, ret != 0)) |
9c547959 | 65 | return false; |
1da177e4 LT |
66 | |
67 | /* Check specific protocol */ | |
3666ed1c | 68 | if (ipinfo->proto && |
c37a2dfa | 69 | NF_INVF(ipinfo, IPT_INV_PROTO, ip->protocol != ipinfo->proto)) |
9c547959 | 70 | return false; |
1da177e4 LT |
71 | |
72 | /* If we have a fragment rule but the packet is not a fragment | |
73 | * then we return zero */ | |
c37a2dfa JP |
74 | if (NF_INVF(ipinfo, IPT_INV_FRAG, |
75 | (ipinfo->flags & IPT_F_FRAG) && !isfrag)) | |
9c547959 | 76 | return false; |
1da177e4 | 77 | |
9c547959 | 78 | return true; |
1da177e4 LT |
79 | } |
80 | ||
022748a9 | 81 | static bool |
1da177e4 LT |
82 | ip_checkentry(const struct ipt_ip *ip) |
83 | { | |
d7cdf816 | 84 | if (ip->flags & ~IPT_F_MASK) |
ccb79bdc | 85 | return false; |
d7cdf816 | 86 | if (ip->invflags & ~IPT_INV_MASK) |
ccb79bdc | 87 | return false; |
ccb79bdc | 88 | return true; |
1da177e4 LT |
89 | } |
90 | ||
91 | static unsigned int | |
4b560b44 | 92 | ipt_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 93 | { |
e87cc472 | 94 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
95 | |
96 | return NF_DROP; | |
97 | } | |
98 | ||
022748a9 | 99 | /* Performance critical */ |
1da177e4 | 100 | static inline struct ipt_entry * |
d5d1baa1 | 101 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
102 | { |
103 | return (struct ipt_entry *)(base + offset); | |
104 | } | |
105 | ||
ba9dda3a | 106 | /* All zeroes == unconditional rule. */ |
022748a9 | 107 | /* Mildly perf critical (only if packet tracing is on) */ |
54d83fc7 | 108 | static inline bool unconditional(const struct ipt_entry *e) |
ba9dda3a | 109 | { |
47901dc2 | 110 | static const struct ipt_ip uncond; |
ba9dda3a | 111 | |
54d83fc7 FW |
112 | return e->target_offset == sizeof(struct ipt_entry) && |
113 | memcmp(&e->ip, &uncond, sizeof(uncond)) == 0; | |
ba9dda3a JK |
114 | } |
115 | ||
d5d1baa1 | 116 | /* for const-correctness */ |
87a2e70d | 117 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
118 | ipt_get_target_c(const struct ipt_entry *e) |
119 | { | |
120 | return ipt_get_target((struct ipt_entry *)e); | |
121 | } | |
122 | ||
f0165888 | 123 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
022748a9 | 124 | static const char *const hooknames[] = { |
6e23ae2a PM |
125 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
126 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 127 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
128 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
129 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
130 | }; |
131 | ||
132 | enum nf_ip_trace_comments { | |
133 | NF_IP_TRACE_COMMENT_RULE, | |
134 | NF_IP_TRACE_COMMENT_RETURN, | |
135 | NF_IP_TRACE_COMMENT_POLICY, | |
136 | }; | |
137 | ||
022748a9 | 138 | static const char *const comments[] = { |
ba9dda3a JK |
139 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
140 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
141 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
142 | }; | |
143 | ||
549d2d41 | 144 | static const struct nf_loginfo trace_loginfo = { |
ba9dda3a JK |
145 | .type = NF_LOG_TYPE_LOG, |
146 | .u = { | |
147 | .log = { | |
148 | .level = 4, | |
ff107d27 | 149 | .logflags = NF_LOG_DEFAULT_MASK, |
ba9dda3a JK |
150 | }, |
151 | }, | |
152 | }; | |
153 | ||
022748a9 | 154 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 155 | static inline int |
d5d1baa1 | 156 | get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e, |
4f2f6f23 JE |
157 | const char *hookname, const char **chainname, |
158 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 159 | { |
87a2e70d | 160 | const struct xt_standard_target *t = (void *)ipt_get_target_c(s); |
ba9dda3a | 161 | |
243bf6e2 | 162 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
163 | /* Head of user chain: ERROR target with chainname */ |
164 | *chainname = t->target.data; | |
165 | (*rulenum) = 0; | |
166 | } else if (s == e) { | |
167 | (*rulenum)++; | |
168 | ||
54d83fc7 | 169 | if (unconditional(s) && |
3666ed1c | 170 | strcmp(t->target.u.kernel.target->name, |
243bf6e2 | 171 | XT_STANDARD_TARGET) == 0 && |
54d83fc7 | 172 | t->verdict < 0) { |
ba9dda3a JK |
173 | /* Tail of chains: STANDARD target (return/policy) */ |
174 | *comment = *chainname == hookname | |
4f2f6f23 JE |
175 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
176 | : comments[NF_IP_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
177 | } |
178 | return 1; | |
179 | } else | |
180 | (*rulenum)++; | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
9dff2c96 EB |
185 | static void trace_packet(struct net *net, |
186 | const struct sk_buff *skb, | |
ba9dda3a JK |
187 | unsigned int hook, |
188 | const struct net_device *in, | |
189 | const struct net_device *out, | |
ecb6f85e | 190 | const char *tablename, |
d5d1baa1 JE |
191 | const struct xt_table_info *private, |
192 | const struct ipt_entry *e) | |
ba9dda3a | 193 | { |
5452e425 | 194 | const struct ipt_entry *root; |
4f2f6f23 | 195 | const char *hookname, *chainname, *comment; |
72b2b1dd | 196 | const struct ipt_entry *iter; |
ba9dda3a JK |
197 | unsigned int rulenum = 0; |
198 | ||
482cfc31 | 199 | root = get_entry(private->entries, private->hook_entry[hook]); |
ba9dda3a | 200 | |
4f2f6f23 JE |
201 | hookname = chainname = hooknames[hook]; |
202 | comment = comments[NF_IP_TRACE_COMMENT_RULE]; | |
ba9dda3a | 203 | |
72b2b1dd JE |
204 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
205 | if (get_chainname_rulenum(iter, e, hookname, | |
206 | &chainname, &comment, &rulenum) != 0) | |
207 | break; | |
ba9dda3a | 208 | |
4017a7ee PNA |
209 | nf_log_trace(net, AF_INET, hook, skb, in, out, &trace_loginfo, |
210 | "TRACE: %s:%s:%s:%u ", | |
211 | tablename, chainname, comment, rulenum); | |
ba9dda3a JK |
212 | } |
213 | #endif | |
214 | ||
6c7941de | 215 | static inline |
98e86403 JE |
216 | struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry) |
217 | { | |
218 | return (void *)entry + entry->next_offset; | |
219 | } | |
220 | ||
1da177e4 LT |
221 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
222 | unsigned int | |
8844e010 FW |
223 | ipt_do_table(void *priv, |
224 | struct sk_buff *skb, | |
225 | const struct nf_hook_state *state) | |
1da177e4 | 226 | { |
8844e010 | 227 | const struct xt_table *table = priv; |
6cb8ff3f | 228 | unsigned int hook = state->hook; |
1da177e4 | 229 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
5452e425 | 230 | const struct iphdr *ip; |
1da177e4 LT |
231 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
232 | unsigned int verdict = NF_DROP; | |
233 | const char *indev, *outdev; | |
d5d1baa1 | 234 | const void *table_base; |
f3c5c1bf | 235 | struct ipt_entry *e, **jumpstack; |
7814b6ec | 236 | unsigned int stackidx, cpu; |
d5d1baa1 | 237 | const struct xt_table_info *private; |
de74c169 | 238 | struct xt_action_param acpar; |
7f5c6d4f | 239 | unsigned int addend; |
1da177e4 LT |
240 | |
241 | /* Initialization */ | |
7814b6ec | 242 | stackidx = 0; |
3db05fea | 243 | ip = ip_hdr(skb); |
1c491ba2 DM |
244 | indev = state->in ? state->in->name : nulldevname; |
245 | outdev = state->out ? state->out->name : nulldevname; | |
1da177e4 LT |
246 | /* We handle fragments by dealing with the first fragment as |
247 | * if it was a normal packet. All other fragments are treated | |
248 | * normally, except that they will NEVER match rules that ask | |
249 | * things we don't know, ie. tcp syn flag or ports). If the | |
250 | * rule is also a fragment-specific rule, non-fragments won't | |
251 | * match it. */ | |
de74c169 JE |
252 | acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
253 | acpar.thoff = ip_hdrlen(skb); | |
b4ba2611 | 254 | acpar.hotdrop = false; |
613dbd95 | 255 | acpar.state = state; |
1da177e4 | 256 | |
9efdb14f | 257 | WARN_ON(!(table->valid_hooks & (1 << hook))); |
7f5c6d4f ED |
258 | local_bh_disable(); |
259 | addend = xt_write_recseq_begin(); | |
d3d40f23 | 260 | private = READ_ONCE(table->private); /* Address dependency. */ |
f3c5c1bf | 261 | cpu = smp_processor_id(); |
482cfc31 | 262 | table_base = private->entries; |
f3c5c1bf | 263 | jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; |
7814b6ec FW |
264 | |
265 | /* Switch to alternate jumpstack if we're being invoked via TEE. | |
266 | * TEE issues XT_CONTINUE verdict on original skb so we must not | |
267 | * clobber the jumpstack. | |
268 | * | |
269 | * For recursion via REJECT or SYNPROXY the stack will be clobbered | |
270 | * but it is no problem since absolute verdict is issued by these. | |
271 | */ | |
dcebd315 FW |
272 | if (static_key_false(&xt_tee_enabled)) |
273 | jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated); | |
78454473 | 274 | |
2e4e6a17 | 275 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 276 | |
1da177e4 | 277 | do { |
87a2e70d | 278 | const struct xt_entry_target *t; |
dcea992a | 279 | const struct xt_entry_match *ematch; |
71ae0dff | 280 | struct xt_counters *counter; |
a1ff4ac8 | 281 | |
9efdb14f | 282 | WARN_ON(!e); |
a1ff4ac8 | 283 | if (!ip_packet_match(ip, indev, outdev, |
de74c169 | 284 | &e->ip, acpar.fragoff)) { |
dcea992a | 285 | no_match: |
a1ff4ac8 JE |
286 | e = ipt_next_entry(e); |
287 | continue; | |
288 | } | |
1da177e4 | 289 | |
ef53d702 | 290 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
291 | acpar.match = ematch->u.kernel.match; |
292 | acpar.matchinfo = ematch->data; | |
293 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 294 | goto no_match; |
ef53d702 | 295 | } |
dcea992a | 296 | |
71ae0dff FW |
297 | counter = xt_get_this_cpu_counter(&e->counters); |
298 | ADD_COUNTER(*counter, skb->len, 1); | |
1da177e4 | 299 | |
dc3c09d3 | 300 | t = ipt_get_target_c(e); |
9efdb14f | 301 | WARN_ON(!t->u.kernel.target); |
ba9dda3a | 302 | |
f0165888 | 303 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
304 | /* The packet is traced: log it */ |
305 | if (unlikely(skb->nf_trace)) | |
9dff2c96 EB |
306 | trace_packet(state->net, skb, hook, state->in, |
307 | state->out, table->name, private, e); | |
ba9dda3a | 308 | #endif |
a1ff4ac8 JE |
309 | /* Standard target? */ |
310 | if (!t->u.kernel.target->target) { | |
311 | int v; | |
312 | ||
87a2e70d | 313 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
314 | if (v < 0) { |
315 | /* Pop from stack? */ | |
243bf6e2 | 316 | if (v != XT_RETURN) { |
95c96174 | 317 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 318 | break; |
1da177e4 | 319 | } |
7814b6ec | 320 | if (stackidx == 0) { |
f3c5c1bf JE |
321 | e = get_entry(table_base, |
322 | private->underflow[hook]); | |
f3c5c1bf | 323 | } else { |
7814b6ec | 324 | e = jumpstack[--stackidx]; |
f3c5c1bf JE |
325 | e = ipt_next_entry(e); |
326 | } | |
a1ff4ac8 JE |
327 | continue; |
328 | } | |
3666ed1c | 329 | if (table_base + v != ipt_next_entry(e) && |
57ebd808 FW |
330 | !(e->ip.flags & IPT_F_GOTO)) { |
331 | if (unlikely(stackidx >= private->stacksize)) { | |
332 | verdict = NF_DROP; | |
333 | break; | |
334 | } | |
7814b6ec | 335 | jumpstack[stackidx++] = e; |
57ebd808 | 336 | } |
1da177e4 | 337 | |
a1ff4ac8 | 338 | e = get_entry(table_base, v); |
7a6b1c46 JE |
339 | continue; |
340 | } | |
341 | ||
de74c169 JE |
342 | acpar.target = t->u.kernel.target; |
343 | acpar.targinfo = t->data; | |
bb70dfa5 | 344 | |
de74c169 | 345 | verdict = t->u.kernel.target->target(skb, &acpar); |
9beceb54 TY |
346 | if (verdict == XT_CONTINUE) { |
347 | /* Target might have changed stuff. */ | |
348 | ip = ip_hdr(skb); | |
7a6b1c46 | 349 | e = ipt_next_entry(e); |
9beceb54 | 350 | } else { |
7a6b1c46 JE |
351 | /* Verdict */ |
352 | break; | |
9beceb54 | 353 | } |
b4ba2611 | 354 | } while (!acpar.hotdrop); |
7814b6ec | 355 | |
24cebe3f IM |
356 | xt_write_recseq_end(addend); |
357 | local_bh_enable(); | |
7f5c6d4f | 358 | |
b4ba2611 | 359 | if (acpar.hotdrop) |
1da177e4 LT |
360 | return NF_DROP; |
361 | else return verdict; | |
1da177e4 LT |
362 | } |
363 | ||
1da177e4 | 364 | /* Figures out from what hook each rule can be called: returns 0 if |
98dbbfc3 | 365 | there are loops. Puts hook bitmask in comefrom. */ |
1da177e4 | 366 | static int |
98dbbfc3 | 367 | mark_source_chains(const struct xt_table_info *newinfo, |
f4dc7771 FW |
368 | unsigned int valid_hooks, void *entry0, |
369 | unsigned int *offsets) | |
1da177e4 LT |
370 | { |
371 | unsigned int hook; | |
372 | ||
373 | /* No recursion; use packet counter to save back ptrs (reset | |
374 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 375 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 376 | unsigned int pos = newinfo->hook_entry[hook]; |
68ad546a | 377 | struct ipt_entry *e = entry0 + pos; |
1da177e4 LT |
378 | |
379 | if (!(valid_hooks & (1 << hook))) | |
380 | continue; | |
381 | ||
382 | /* Set initial back pointer. */ | |
383 | e->counters.pcnt = pos; | |
384 | ||
385 | for (;;) { | |
87a2e70d | 386 | const struct xt_standard_target *t |
d5d1baa1 | 387 | = (void *)ipt_get_target_c(e); |
e1b4b9f3 | 388 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 389 | |
d7cdf816 | 390 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) |
1da177e4 | 391 | return 0; |
d7cdf816 | 392 | |
9c547959 | 393 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
394 | |
395 | /* Unconditional return/END. */ | |
54d83fc7 | 396 | if ((unconditional(e) && |
3666ed1c | 397 | (strcmp(t->target.u.user.name, |
243bf6e2 | 398 | XT_STANDARD_TARGET) == 0) && |
54d83fc7 | 399 | t->verdict < 0) || visited) { |
1da177e4 LT |
400 | unsigned int oldpos, size; |
401 | ||
402 | /* Return: backtrack through the last | |
403 | big jump. */ | |
404 | do { | |
6e23ae2a | 405 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
406 | oldpos = pos; |
407 | pos = e->counters.pcnt; | |
408 | e->counters.pcnt = 0; | |
409 | ||
410 | /* We're at the start. */ | |
411 | if (pos == oldpos) | |
412 | goto next; | |
413 | ||
68ad546a | 414 | e = entry0 + pos; |
1da177e4 LT |
415 | } while (oldpos == pos + e->next_offset); |
416 | ||
417 | /* Move along one */ | |
418 | size = e->next_offset; | |
68ad546a | 419 | e = entry0 + pos + size; |
f24e230d FW |
420 | if (pos + size >= newinfo->size) |
421 | return 0; | |
1da177e4 LT |
422 | e->counters.pcnt = pos; |
423 | pos += size; | |
424 | } else { | |
425 | int newpos = t->verdict; | |
426 | ||
427 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 428 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 429 | newpos >= 0) { |
1da177e4 | 430 | /* This a jump; chase it. */ |
f4dc7771 FW |
431 | if (!xt_find_jump_offset(offsets, newpos, |
432 | newinfo->number)) | |
433 | return 0; | |
1da177e4 LT |
434 | } else { |
435 | /* ... this is a fallthru */ | |
436 | newpos = pos + e->next_offset; | |
f24e230d FW |
437 | if (newpos >= newinfo->size) |
438 | return 0; | |
1da177e4 | 439 | } |
68ad546a | 440 | e = entry0 + newpos; |
1da177e4 LT |
441 | e->counters.pcnt = pos; |
442 | pos = newpos; | |
443 | } | |
444 | } | |
d7cdf816 | 445 | next: ; |
1da177e4 LT |
446 | } |
447 | return 1; | |
448 | } | |
449 | ||
87a2e70d | 450 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 451 | { |
6be3d859 JE |
452 | struct xt_mtdtor_param par; |
453 | ||
f54e9367 | 454 | par.net = net; |
6be3d859 JE |
455 | par.match = m->u.kernel.match; |
456 | par.matchinfo = m->data; | |
916a917d | 457 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
458 | if (par.match->destroy != NULL) |
459 | par.match->destroy(&par); | |
460 | module_put(par.match->me); | |
1da177e4 LT |
461 | } |
462 | ||
022748a9 | 463 | static int |
87a2e70d | 464 | check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
a96be246 | 465 | { |
9b4fce7a | 466 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 | 467 | |
9b4fce7a JE |
468 | par->match = m->u.kernel.match; |
469 | par->matchinfo = m->data; | |
470 | ||
d7cdf816 PNA |
471 | return xt_check_match(par, m->u.match_size - sizeof(*m), |
472 | ip->proto, ip->invflags & IPT_INV_PROTO); | |
a96be246 DM |
473 | } |
474 | ||
022748a9 | 475 | static int |
87a2e70d | 476 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 477 | { |
6709dbbb | 478 | struct xt_match *match; |
3cdc7c95 | 479 | int ret; |
1da177e4 | 480 | |
fd0ec0e6 JE |
481 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
482 | m->u.user.revision); | |
d7cdf816 | 483 | if (IS_ERR(match)) |
fd0ec0e6 | 484 | return PTR_ERR(match); |
1da177e4 LT |
485 | m->u.kernel.match = match; |
486 | ||
6bdb331b | 487 | ret = check_match(m, par); |
3cdc7c95 PM |
488 | if (ret) |
489 | goto err; | |
490 | ||
1da177e4 | 491 | return 0; |
3cdc7c95 PM |
492 | err: |
493 | module_put(m->u.kernel.match->me); | |
494 | return ret; | |
1da177e4 LT |
495 | } |
496 | ||
add67461 | 497 | static int check_target(struct ipt_entry *e, struct net *net, const char *name) |
a96be246 | 498 | { |
87a2e70d | 499 | struct xt_entry_target *t = ipt_get_target(e); |
af5d6dc2 | 500 | struct xt_tgchk_param par = { |
add67461 | 501 | .net = net, |
af5d6dc2 JE |
502 | .table = name, |
503 | .entryinfo = e, | |
504 | .target = t->u.kernel.target, | |
505 | .targinfo = t->data, | |
506 | .hook_mask = e->comefrom, | |
916a917d | 507 | .family = NFPROTO_IPV4, |
af5d6dc2 | 508 | }; |
a96be246 | 509 | |
d7cdf816 PNA |
510 | return xt_check_target(&par, t->u.target_size - sizeof(*t), |
511 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); | |
a96be246 | 512 | } |
1da177e4 | 513 | |
022748a9 | 514 | static int |
a83d8e8d | 515 | find_check_entry(struct ipt_entry *e, struct net *net, const char *name, |
ae0ac0ed FW |
516 | unsigned int size, |
517 | struct xt_percpu_counter_alloc_state *alloc_state) | |
1da177e4 | 518 | { |
87a2e70d | 519 | struct xt_entry_target *t; |
6709dbbb | 520 | struct xt_target *target; |
1da177e4 LT |
521 | int ret; |
522 | unsigned int j; | |
9b4fce7a | 523 | struct xt_mtchk_param mtpar; |
dcea992a | 524 | struct xt_entry_match *ematch; |
1da177e4 | 525 | |
ae0ac0ed | 526 | if (!xt_percpu_counter_alloc(alloc_state, &e->counters)) |
71ae0dff FW |
527 | return -ENOMEM; |
528 | ||
1da177e4 | 529 | j = 0; |
c568503e | 530 | memset(&mtpar, 0, sizeof(mtpar)); |
a83d8e8d | 531 | mtpar.net = net; |
9b4fce7a JE |
532 | mtpar.table = name; |
533 | mtpar.entryinfo = &e->ip; | |
534 | mtpar.hook_mask = e->comefrom; | |
916a917d | 535 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 536 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 537 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 538 | if (ret != 0) |
6bdb331b JE |
539 | goto cleanup_matches; |
540 | ++j; | |
dcea992a | 541 | } |
1da177e4 LT |
542 | |
543 | t = ipt_get_target(e); | |
d2a7b6ba JE |
544 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
545 | t->u.user.revision); | |
546 | if (IS_ERR(target)) { | |
d2a7b6ba | 547 | ret = PTR_ERR(target); |
1da177e4 LT |
548 | goto cleanup_matches; |
549 | } | |
550 | t->u.kernel.target = target; | |
551 | ||
add67461 | 552 | ret = check_target(e, net, name); |
3cdc7c95 PM |
553 | if (ret) |
554 | goto err; | |
71ae0dff | 555 | |
1da177e4 | 556 | return 0; |
3cdc7c95 PM |
557 | err: |
558 | module_put(t->u.kernel.target->me); | |
1da177e4 | 559 | cleanup_matches: |
6bdb331b JE |
560 | xt_ematch_foreach(ematch, e) { |
561 | if (j-- == 0) | |
dcea992a | 562 | break; |
6bdb331b JE |
563 | cleanup_match(ematch, net); |
564 | } | |
71ae0dff | 565 | |
4d31eef5 | 566 | xt_percpu_counter_free(&e->counters); |
71ae0dff | 567 | |
1da177e4 LT |
568 | return ret; |
569 | } | |
570 | ||
d5d1baa1 | 571 | static bool check_underflow(const struct ipt_entry *e) |
e2fe35c1 | 572 | { |
87a2e70d | 573 | const struct xt_entry_target *t; |
e2fe35c1 JE |
574 | unsigned int verdict; |
575 | ||
54d83fc7 | 576 | if (!unconditional(e)) |
e2fe35c1 | 577 | return false; |
d5d1baa1 | 578 | t = ipt_get_target_c(e); |
e2fe35c1 JE |
579 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
580 | return false; | |
87a2e70d | 581 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
582 | verdict = -verdict - 1; |
583 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
584 | } | |
585 | ||
022748a9 | 586 | static int |
1da177e4 | 587 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 588 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
589 | const unsigned char *base, |
590 | const unsigned char *limit, | |
1da177e4 LT |
591 | const unsigned int *hook_entries, |
592 | const unsigned int *underflows, | |
0559518b | 593 | unsigned int valid_hooks) |
1da177e4 LT |
594 | { |
595 | unsigned int h; | |
bdf533de | 596 | int err; |
1da177e4 | 597 | |
3666ed1c | 598 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 || |
6e94e0cf | 599 | (unsigned char *)e + sizeof(struct ipt_entry) >= limit || |
d7cdf816 | 600 | (unsigned char *)e + e->next_offset > limit) |
1da177e4 | 601 | return -EINVAL; |
1da177e4 LT |
602 | |
603 | if (e->next_offset | |
d7cdf816 | 604 | < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target)) |
1da177e4 | 605 | return -EINVAL; |
1da177e4 | 606 | |
aa412ba2 FW |
607 | if (!ip_checkentry(&e->ip)) |
608 | return -EINVAL; | |
609 | ||
ce683e5f FW |
610 | err = xt_check_entry_offsets(e, e->elems, e->target_offset, |
611 | e->next_offset); | |
bdf533de FW |
612 | if (err) |
613 | return err; | |
614 | ||
1da177e4 | 615 | /* Check hooks & underflows */ |
6e23ae2a | 616 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
617 | if (!(valid_hooks & (1 << h))) |
618 | continue; | |
1da177e4 LT |
619 | if ((unsigned char *)e - base == hook_entries[h]) |
620 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 621 | if ((unsigned char *)e - base == underflows[h]) { |
d7cdf816 | 622 | if (!check_underflow(e)) |
90e7d4ab | 623 | return -EINVAL; |
d7cdf816 | 624 | |
1da177e4 | 625 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 626 | } |
1da177e4 LT |
627 | } |
628 | ||
1da177e4 | 629 | /* Clear counters and comefrom */ |
2e4e6a17 | 630 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 631 | e->comefrom = 0; |
1da177e4 LT |
632 | return 0; |
633 | } | |
634 | ||
0559518b JE |
635 | static void |
636 | cleanup_entry(struct ipt_entry *e, struct net *net) | |
1da177e4 | 637 | { |
a2df1648 | 638 | struct xt_tgdtor_param par; |
87a2e70d | 639 | struct xt_entry_target *t; |
dcea992a | 640 | struct xt_entry_match *ematch; |
1da177e4 | 641 | |
1da177e4 | 642 | /* Cleanup all matches */ |
dcea992a | 643 | xt_ematch_foreach(ematch, e) |
6bdb331b | 644 | cleanup_match(ematch, net); |
1da177e4 | 645 | t = ipt_get_target(e); |
a2df1648 | 646 | |
add67461 | 647 | par.net = net; |
a2df1648 JE |
648 | par.target = t->u.kernel.target; |
649 | par.targinfo = t->data; | |
916a917d | 650 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
651 | if (par.target->destroy != NULL) |
652 | par.target->destroy(&par); | |
653 | module_put(par.target->me); | |
4d31eef5 | 654 | xt_percpu_counter_free(&e->counters); |
1da177e4 LT |
655 | } |
656 | ||
657 | /* Checks and translates the user-supplied table segment (held in | |
658 | newinfo) */ | |
659 | static int | |
0f234214 | 660 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
6c28255b | 661 | const struct ipt_replace *repl) |
1da177e4 | 662 | { |
ae0ac0ed | 663 | struct xt_percpu_counter_alloc_state alloc_state = { 0 }; |
72b2b1dd | 664 | struct ipt_entry *iter; |
f4dc7771 | 665 | unsigned int *offsets; |
1da177e4 | 666 | unsigned int i; |
72b2b1dd | 667 | int ret = 0; |
1da177e4 | 668 | |
0f234214 JE |
669 | newinfo->size = repl->size; |
670 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
671 | |
672 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 673 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
674 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
675 | newinfo->underflow[i] = 0xFFFFFFFF; | |
676 | } | |
677 | ||
f4dc7771 FW |
678 | offsets = xt_alloc_entry_offsets(newinfo->number); |
679 | if (!offsets) | |
680 | return -ENOMEM; | |
1da177e4 LT |
681 | i = 0; |
682 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
683 | xt_entry_foreach(iter, entry0, newinfo->size) { |
684 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
685 | entry0 + repl->size, |
686 | repl->hook_entry, | |
687 | repl->underflow, | |
688 | repl->valid_hooks); | |
72b2b1dd | 689 | if (ret != 0) |
f4dc7771 FW |
690 | goto out_free; |
691 | if (i < repl->num_entries) | |
692 | offsets[i] = (void *)iter - entry0; | |
0559518b | 693 | ++i; |
98dbbfc3 FW |
694 | if (strcmp(ipt_get_target(iter)->u.user.name, |
695 | XT_ERROR_TARGET) == 0) | |
696 | ++newinfo->stacksize; | |
72b2b1dd | 697 | } |
1da177e4 | 698 | |
f4dc7771 | 699 | ret = -EINVAL; |
d7cdf816 | 700 | if (i != repl->num_entries) |
f4dc7771 | 701 | goto out_free; |
1da177e4 | 702 | |
1b293e30 FW |
703 | ret = xt_check_table_hooks(newinfo, repl->valid_hooks); |
704 | if (ret) | |
705 | goto out_free; | |
1da177e4 | 706 | |
f4dc7771 FW |
707 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) { |
708 | ret = -ELOOP; | |
709 | goto out_free; | |
710 | } | |
711 | kvfree(offsets); | |
74c9c0c1 | 712 | |
1da177e4 LT |
713 | /* Finally, each sanity check must pass */ |
714 | i = 0; | |
72b2b1dd | 715 | xt_entry_foreach(iter, entry0, newinfo->size) { |
ae0ac0ed FW |
716 | ret = find_check_entry(iter, net, repl->name, repl->size, |
717 | &alloc_state); | |
72b2b1dd JE |
718 | if (ret != 0) |
719 | break; | |
0559518b | 720 | ++i; |
72b2b1dd | 721 | } |
1da177e4 | 722 | |
74c9c0c1 | 723 | if (ret != 0) { |
0559518b JE |
724 | xt_entry_foreach(iter, entry0, newinfo->size) { |
725 | if (i-- == 0) | |
72b2b1dd | 726 | break; |
0559518b JE |
727 | cleanup_entry(iter, net); |
728 | } | |
74c9c0c1 DM |
729 | return ret; |
730 | } | |
1da177e4 | 731 | |
f4dc7771 FW |
732 | return ret; |
733 | out_free: | |
734 | kvfree(offsets); | |
1da177e4 LT |
735 | return ret; |
736 | } | |
737 | ||
1da177e4 | 738 | static void |
2e4e6a17 HW |
739 | get_counters(const struct xt_table_info *t, |
740 | struct xt_counters counters[]) | |
1da177e4 | 741 | { |
72b2b1dd | 742 | struct ipt_entry *iter; |
1da177e4 LT |
743 | unsigned int cpu; |
744 | unsigned int i; | |
745 | ||
6f912042 | 746 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 747 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 748 | |
1da177e4 | 749 | i = 0; |
482cfc31 | 750 | xt_entry_foreach(iter, t->entries, t->size) { |
71ae0dff | 751 | struct xt_counters *tmp; |
83723d60 ED |
752 | u64 bcnt, pcnt; |
753 | unsigned int start; | |
754 | ||
71ae0dff | 755 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
83723d60 | 756 | do { |
7f5c6d4f | 757 | start = read_seqcount_begin(s); |
71ae0dff FW |
758 | bcnt = tmp->bcnt; |
759 | pcnt = tmp->pcnt; | |
7f5c6d4f | 760 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
761 | |
762 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b | 763 | ++i; /* macro does multi eval of i */ |
a5d7a714 | 764 | cond_resched(); |
0559518b | 765 | } |
1da177e4 | 766 | } |
78454473 SH |
767 | } |
768 | ||
d13e7b2e FW |
769 | static void get_old_counters(const struct xt_table_info *t, |
770 | struct xt_counters counters[]) | |
771 | { | |
772 | struct ipt_entry *iter; | |
773 | unsigned int cpu, i; | |
774 | ||
775 | for_each_possible_cpu(cpu) { | |
776 | i = 0; | |
777 | xt_entry_foreach(iter, t->entries, t->size) { | |
778 | const struct xt_counters *tmp; | |
779 | ||
780 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); | |
781 | ADD_COUNTER(counters[i], tmp->bcnt, tmp->pcnt); | |
782 | ++i; /* macro does multi eval of i */ | |
783 | } | |
784 | ||
785 | cond_resched(); | |
786 | } | |
787 | } | |
788 | ||
d5d1baa1 | 789 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 790 | { |
2722971c | 791 | unsigned int countersize; |
2e4e6a17 | 792 | struct xt_counters *counters; |
d3d40f23 | 793 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
794 | |
795 | /* We need atomic snapshot of counters: rest doesn't change | |
796 | (other than comefrom, which userspace doesn't care | |
797 | about). */ | |
2e4e6a17 | 798 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 799 | counters = vzalloc(countersize); |
1da177e4 LT |
800 | |
801 | if (counters == NULL) | |
942e4a2b | 802 | return ERR_PTR(-ENOMEM); |
78454473 | 803 | |
942e4a2b | 804 | get_counters(private, counters); |
1da177e4 | 805 | |
2722971c DM |
806 | return counters; |
807 | } | |
808 | ||
809 | static int | |
810 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 811 | const struct xt_table *table, |
2722971c DM |
812 | void __user *userptr) |
813 | { | |
814 | unsigned int off, num; | |
d5d1baa1 | 815 | const struct ipt_entry *e; |
2722971c | 816 | struct xt_counters *counters; |
d3d40f23 | 817 | const struct xt_table_info *private = table->private; |
2722971c | 818 | int ret = 0; |
711bdde6 | 819 | const void *loc_cpu_entry; |
2722971c DM |
820 | |
821 | counters = alloc_counters(table); | |
822 | if (IS_ERR(counters)) | |
823 | return PTR_ERR(counters); | |
824 | ||
482cfc31 | 825 | loc_cpu_entry = private->entries; |
1da177e4 LT |
826 | |
827 | /* FIXME: use iterator macros --RR */ | |
828 | /* ... then go back and fix counters and names */ | |
829 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
830 | unsigned int i; | |
87a2e70d JE |
831 | const struct xt_entry_match *m; |
832 | const struct xt_entry_target *t; | |
1da177e4 | 833 | |
68ad546a | 834 | e = loc_cpu_entry + off; |
f77bc5b2 WB |
835 | if (copy_to_user(userptr + off, e, sizeof(*e))) { |
836 | ret = -EFAULT; | |
837 | goto free_counters; | |
838 | } | |
1da177e4 LT |
839 | if (copy_to_user(userptr + off |
840 | + offsetof(struct ipt_entry, counters), | |
841 | &counters[num], | |
842 | sizeof(counters[num])) != 0) { | |
843 | ret = -EFAULT; | |
844 | goto free_counters; | |
845 | } | |
846 | ||
847 | for (i = sizeof(struct ipt_entry); | |
848 | i < e->target_offset; | |
849 | i += m->u.match_size) { | |
850 | m = (void *)e + i; | |
851 | ||
f77bc5b2 | 852 | if (xt_match_to_user(m, userptr + off + i)) { |
1da177e4 LT |
853 | ret = -EFAULT; |
854 | goto free_counters; | |
855 | } | |
856 | } | |
857 | ||
d5d1baa1 | 858 | t = ipt_get_target_c(e); |
f77bc5b2 | 859 | if (xt_target_to_user(t, userptr + off + e->target_offset)) { |
1da177e4 LT |
860 | ret = -EFAULT; |
861 | goto free_counters; | |
862 | } | |
863 | } | |
864 | ||
865 | free_counters: | |
866 | vfree(counters); | |
867 | return ret; | |
868 | } | |
869 | ||
47a6959f | 870 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
739674fb | 871 | static void compat_standard_from_user(void *dst, const void *src) |
2722971c | 872 | { |
9fa492cd | 873 | int v = *(compat_int_t *)src; |
2722971c | 874 | |
9fa492cd | 875 | if (v > 0) |
b386d9f5 | 876 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
877 | memcpy(dst, &v, sizeof(v)); |
878 | } | |
46c5ea3c | 879 | |
739674fb | 880 | static int compat_standard_to_user(void __user *dst, const void *src) |
2722971c | 881 | { |
9fa492cd | 882 | compat_int_t cv = *(int *)src; |
2722971c | 883 | |
9fa492cd | 884 | if (cv > 0) |
b386d9f5 | 885 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 886 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
887 | } |
888 | ||
d5d1baa1 | 889 | static int compat_calc_entry(const struct ipt_entry *e, |
4b478248 | 890 | const struct xt_table_info *info, |
d5d1baa1 | 891 | const void *base, struct xt_table_info *newinfo) |
2722971c | 892 | { |
dcea992a | 893 | const struct xt_entry_match *ematch; |
87a2e70d | 894 | const struct xt_entry_target *t; |
e5b5ef7d | 895 | unsigned int entry_offset; |
2722971c DM |
896 | int off, i, ret; |
897 | ||
30c08c41 | 898 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c | 899 | entry_offset = (void *)e - base; |
dcea992a | 900 | xt_ematch_foreach(ematch, e) |
6bdb331b | 901 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 902 | t = ipt_get_target_c(e); |
9fa492cd | 903 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 904 | newinfo->size -= off; |
b386d9f5 | 905 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
906 | if (ret) |
907 | return ret; | |
908 | ||
6e23ae2a | 909 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
910 | if (info->hook_entry[i] && |
911 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 912 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
913 | if (info->underflow[i] && |
914 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
915 | newinfo->underflow[i] -= off; |
916 | } | |
917 | return 0; | |
918 | } | |
919 | ||
259d4e41 | 920 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 921 | struct xt_table_info *newinfo) |
2722971c | 922 | { |
72b2b1dd | 923 | struct ipt_entry *iter; |
711bdde6 | 924 | const void *loc_cpu_entry; |
0559518b | 925 | int ret; |
2722971c DM |
926 | |
927 | if (!newinfo || !info) | |
928 | return -EINVAL; | |
929 | ||
482cfc31 | 930 | /* we dont care about newinfo->entries */ |
259d4e41 ED |
931 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
932 | newinfo->initial_entries = 0; | |
482cfc31 | 933 | loc_cpu_entry = info->entries; |
9782a11e FW |
934 | ret = xt_compat_init_offsets(AF_INET, info->number); |
935 | if (ret) | |
936 | return ret; | |
72b2b1dd JE |
937 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
938 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
939 | if (ret != 0) | |
0559518b | 940 | return ret; |
72b2b1dd | 941 | } |
0559518b | 942 | return 0; |
2722971c DM |
943 | } |
944 | #endif | |
945 | ||
89c53c14 | 946 | static int get_info(struct net *net, void __user *user, const int *len) |
2722971c | 947 | { |
12b00c2c | 948 | char name[XT_TABLE_MAXNAMELEN]; |
e60a13e0 | 949 | struct xt_table *t; |
2722971c DM |
950 | int ret; |
951 | ||
d7cdf816 | 952 | if (*len != sizeof(struct ipt_getinfo)) |
2722971c | 953 | return -EINVAL; |
2722971c DM |
954 | |
955 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
956 | return -EFAULT; | |
957 | ||
12b00c2c | 958 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
47a6959f | 959 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
89c53c14 | 960 | if (in_compat_syscall()) |
2722971c DM |
961 | xt_compat_lock(AF_INET); |
962 | #endif | |
03d13b68 FW |
963 | t = xt_request_find_table_lock(net, AF_INET, name); |
964 | if (!IS_ERR(t)) { | |
2722971c | 965 | struct ipt_getinfo info; |
d3d40f23 | 966 | const struct xt_table_info *private = t->private; |
47a6959f | 967 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
14c7dbe0 AD |
968 | struct xt_table_info tmp; |
969 | ||
89c53c14 | 970 | if (in_compat_syscall()) { |
2722971c | 971 | ret = compat_table_info(private, &tmp); |
b386d9f5 | 972 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 973 | private = &tmp; |
2722971c DM |
974 | } |
975 | #endif | |
b5f15ac4 | 976 | memset(&info, 0, sizeof(info)); |
2722971c DM |
977 | info.valid_hooks = t->valid_hooks; |
978 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 979 | sizeof(info.hook_entry)); |
2722971c | 980 | memcpy(info.underflow, private->underflow, |
4b478248 | 981 | sizeof(info.underflow)); |
2722971c DM |
982 | info.num_entries = private->number; |
983 | info.size = private->size; | |
984 | strcpy(info.name, name); | |
985 | ||
986 | if (copy_to_user(user, &info, *len) != 0) | |
987 | ret = -EFAULT; | |
988 | else | |
989 | ret = 0; | |
990 | ||
991 | xt_table_unlock(t); | |
992 | module_put(t->me); | |
993 | } else | |
03d13b68 | 994 | ret = PTR_ERR(t); |
47a6959f | 995 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
89c53c14 | 996 | if (in_compat_syscall()) |
2722971c DM |
997 | xt_compat_unlock(AF_INET); |
998 | #endif | |
999 | return ret; | |
1000 | } | |
1001 | ||
1002 | static int | |
d5d1baa1 JE |
1003 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
1004 | const int *len) | |
2722971c DM |
1005 | { |
1006 | int ret; | |
1007 | struct ipt_get_entries get; | |
e60a13e0 | 1008 | struct xt_table *t; |
2722971c | 1009 | |
d7cdf816 | 1010 | if (*len < sizeof(get)) |
2722971c | 1011 | return -EINVAL; |
2722971c DM |
1012 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1013 | return -EFAULT; | |
d7cdf816 | 1014 | if (*len != sizeof(struct ipt_get_entries) + get.size) |
2722971c | 1015 | return -EINVAL; |
b301f253 | 1016 | get.name[sizeof(get.name) - 1] = '\0'; |
2722971c | 1017 | |
34bd137b | 1018 | t = xt_find_table_lock(net, AF_INET, get.name); |
03d13b68 | 1019 | if (!IS_ERR(t)) { |
d3d40f23 | 1020 | const struct xt_table_info *private = t->private; |
2722971c DM |
1021 | if (get.size == private->size) |
1022 | ret = copy_entries_to_user(private->size, | |
1023 | t, uptr->entrytable); | |
d7cdf816 | 1024 | else |
544473c1 | 1025 | ret = -EAGAIN; |
d7cdf816 | 1026 | |
2722971c DM |
1027 | module_put(t->me); |
1028 | xt_table_unlock(t); | |
1029 | } else | |
03d13b68 | 1030 | ret = PTR_ERR(t); |
2722971c DM |
1031 | |
1032 | return ret; | |
1033 | } | |
1034 | ||
1035 | static int | |
34bd137b | 1036 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1037 | struct xt_table_info *newinfo, unsigned int num_counters, |
1038 | void __user *counters_ptr) | |
2722971c DM |
1039 | { |
1040 | int ret; | |
e60a13e0 | 1041 | struct xt_table *t; |
2722971c DM |
1042 | struct xt_table_info *oldinfo; |
1043 | struct xt_counters *counters; | |
72b2b1dd | 1044 | struct ipt_entry *iter; |
2722971c | 1045 | |
c84ca954 | 1046 | counters = xt_counters_alloc(num_counters); |
2722971c DM |
1047 | if (!counters) { |
1048 | ret = -ENOMEM; | |
1049 | goto out; | |
1050 | } | |
1051 | ||
03d13b68 FW |
1052 | t = xt_request_find_table_lock(net, AF_INET, name); |
1053 | if (IS_ERR(t)) { | |
1054 | ret = PTR_ERR(t); | |
2722971c DM |
1055 | goto free_newinfo_counters_untrans; |
1056 | } | |
1057 | ||
1058 | /* You lied! */ | |
1059 | if (valid_hooks != t->valid_hooks) { | |
2722971c DM |
1060 | ret = -EINVAL; |
1061 | goto put_module; | |
1062 | } | |
1063 | ||
1064 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1065 | if (!oldinfo) | |
1066 | goto put_module; | |
1067 | ||
1068 | /* Update module usage count based on number of rules */ | |
2722971c DM |
1069 | if ((oldinfo->number > oldinfo->initial_entries) || |
1070 | (newinfo->number <= oldinfo->initial_entries)) | |
1071 | module_put(t->me); | |
1072 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1073 | (newinfo->number <= oldinfo->initial_entries)) | |
1074 | module_put(t->me); | |
1075 | ||
f31e5f1a XL |
1076 | xt_table_unlock(t); |
1077 | ||
d13e7b2e | 1078 | get_old_counters(oldinfo, counters); |
942e4a2b | 1079 | |
2722971c | 1080 | /* Decrease module usage counts and free resource */ |
482cfc31 | 1081 | xt_entry_foreach(iter, oldinfo->entries, oldinfo->size) |
0559518b | 1082 | cleanup_entry(iter, net); |
72b2b1dd | 1083 | |
2722971c DM |
1084 | xt_free_table_info(oldinfo); |
1085 | if (copy_to_user(counters_ptr, counters, | |
c58dd2dd TG |
1086 | sizeof(struct xt_counters) * num_counters) != 0) { |
1087 | /* Silent error, can't fail, new table is already in place */ | |
1088 | net_warn_ratelimited("iptables: counters copy to user failed while replacing table\n"); | |
1089 | } | |
2722971c | 1090 | vfree(counters); |
e58a171d | 1091 | return 0; |
2722971c DM |
1092 | |
1093 | put_module: | |
1094 | module_put(t->me); | |
1095 | xt_table_unlock(t); | |
1096 | free_newinfo_counters_untrans: | |
1097 | vfree(counters); | |
1098 | out: | |
1099 | return ret; | |
1100 | } | |
1101 | ||
1102 | static int | |
c2f12630 | 1103 | do_replace(struct net *net, sockptr_t arg, unsigned int len) |
2722971c DM |
1104 | { |
1105 | int ret; | |
1106 | struct ipt_replace tmp; | |
1107 | struct xt_table_info *newinfo; | |
1108 | void *loc_cpu_entry; | |
72b2b1dd | 1109 | struct ipt_entry *iter; |
2722971c | 1110 | |
0c83842d ED |
1111 | if (len < sizeof(tmp)) |
1112 | return -EINVAL; | |
c2f12630 | 1113 | if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0) |
2722971c DM |
1114 | return -EFAULT; |
1115 | ||
2722971c | 1116 | /* overflow check */ |
2722971c DM |
1117 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1118 | return -ENOMEM; | |
1086bbe9 DJ |
1119 | if (tmp.num_counters == 0) |
1120 | return -EINVAL; | |
65acf6e0 ED |
1121 | if ((u64)len < (u64)tmp.size + sizeof(tmp)) |
1122 | return -EINVAL; | |
1086bbe9 | 1123 | |
78b79876 | 1124 | tmp.name[sizeof(tmp.name)-1] = 0; |
2722971c DM |
1125 | |
1126 | newinfo = xt_alloc_table_info(tmp.size); | |
1127 | if (!newinfo) | |
1128 | return -ENOMEM; | |
1129 | ||
482cfc31 | 1130 | loc_cpu_entry = newinfo->entries; |
d3c48151 CH |
1131 | if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp), |
1132 | tmp.size) != 0) { | |
2722971c DM |
1133 | ret = -EFAULT; |
1134 | goto free_newinfo; | |
1135 | } | |
1136 | ||
0f234214 | 1137 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
2722971c DM |
1138 | if (ret != 0) |
1139 | goto free_newinfo; | |
1140 | ||
34bd137b | 1141 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1142 | tmp.num_counters, tmp.counters); |
2722971c DM |
1143 | if (ret) |
1144 | goto free_newinfo_untrans; | |
1145 | return 0; | |
1146 | ||
1147 | free_newinfo_untrans: | |
72b2b1dd | 1148 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1149 | cleanup_entry(iter, net); |
2722971c DM |
1150 | free_newinfo: |
1151 | xt_free_table_info(newinfo); | |
1152 | return ret; | |
1153 | } | |
1154 | ||
2722971c | 1155 | static int |
ab214d1b | 1156 | do_add_counters(struct net *net, sockptr_t arg, unsigned int len) |
2722971c | 1157 | { |
482cfc31 | 1158 | unsigned int i; |
2722971c DM |
1159 | struct xt_counters_info tmp; |
1160 | struct xt_counters *paddc; | |
e60a13e0 | 1161 | struct xt_table *t; |
5452e425 | 1162 | const struct xt_table_info *private; |
2722971c | 1163 | int ret = 0; |
72b2b1dd | 1164 | struct ipt_entry *iter; |
7f5c6d4f | 1165 | unsigned int addend; |
2722971c | 1166 | |
ab214d1b | 1167 | paddc = xt_copy_counters(arg, len, &tmp); |
d7591f0c FW |
1168 | if (IS_ERR(paddc)) |
1169 | return PTR_ERR(paddc); | |
2722971c | 1170 | |
d7591f0c | 1171 | t = xt_find_table_lock(net, AF_INET, tmp.name); |
03d13b68 FW |
1172 | if (IS_ERR(t)) { |
1173 | ret = PTR_ERR(t); | |
2722971c DM |
1174 | goto free; |
1175 | } | |
1176 | ||
942e4a2b | 1177 | local_bh_disable(); |
d3d40f23 | 1178 | private = t->private; |
d7591f0c | 1179 | if (private->number != tmp.num_counters) { |
2722971c DM |
1180 | ret = -EINVAL; |
1181 | goto unlock_up_free; | |
1182 | } | |
1183 | ||
1184 | i = 0; | |
7f5c6d4f | 1185 | addend = xt_write_recseq_begin(); |
482cfc31 | 1186 | xt_entry_foreach(iter, private->entries, private->size) { |
71ae0dff FW |
1187 | struct xt_counters *tmp; |
1188 | ||
1189 | tmp = xt_get_this_cpu_counter(&iter->counters); | |
1190 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); | |
0559518b JE |
1191 | ++i; |
1192 | } | |
7f5c6d4f | 1193 | xt_write_recseq_end(addend); |
2722971c | 1194 | unlock_up_free: |
942e4a2b | 1195 | local_bh_enable(); |
2722971c DM |
1196 | xt_table_unlock(t); |
1197 | module_put(t->me); | |
1198 | free: | |
1199 | vfree(paddc); | |
1200 | ||
1201 | return ret; | |
1202 | } | |
1203 | ||
47a6959f | 1204 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
2722971c | 1205 | struct compat_ipt_replace { |
12b00c2c | 1206 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1207 | u32 valid_hooks; |
1208 | u32 num_entries; | |
1209 | u32 size; | |
6e23ae2a PM |
1210 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1211 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c | 1212 | u32 num_counters; |
87a2e70d | 1213 | compat_uptr_t counters; /* struct xt_counters * */ |
6daf1414 | 1214 | struct compat_ipt_entry entries[]; |
2722971c DM |
1215 | }; |
1216 | ||
a18aa31b PM |
1217 | static int |
1218 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1219 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1220 | unsigned int i) |
2722971c | 1221 | { |
87a2e70d | 1222 | struct xt_entry_target *t; |
2722971c DM |
1223 | struct compat_ipt_entry __user *ce; |
1224 | u_int16_t target_offset, next_offset; | |
1225 | compat_uint_t origsize; | |
dcea992a JE |
1226 | const struct xt_entry_match *ematch; |
1227 | int ret = 0; | |
2722971c | 1228 | |
2722971c | 1229 | origsize = *size; |
68ad546a | 1230 | ce = *dstptr; |
0559518b JE |
1231 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
1232 | copy_to_user(&ce->counters, &counters[i], | |
1233 | sizeof(counters[i])) != 0) | |
1234 | return -EFAULT; | |
a18aa31b | 1235 | |
2722971c | 1236 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1237 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1238 | ||
dcea992a JE |
1239 | xt_ematch_foreach(ematch, e) { |
1240 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1241 | if (ret != 0) | |
6bdb331b | 1242 | return ret; |
dcea992a | 1243 | } |
2722971c | 1244 | target_offset = e->target_offset - (origsize - *size); |
2722971c | 1245 | t = ipt_get_target(e); |
9fa492cd | 1246 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c | 1247 | if (ret) |
0559518b | 1248 | return ret; |
2722971c | 1249 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1250 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1251 | put_user(next_offset, &ce->next_offset) != 0) | |
1252 | return -EFAULT; | |
2722971c | 1253 | return 0; |
2722971c DM |
1254 | } |
1255 | ||
022748a9 | 1256 | static int |
87a2e70d | 1257 | compat_find_calc_match(struct xt_entry_match *m, |
4b478248 | 1258 | const struct ipt_ip *ip, |
6bdb331b | 1259 | int *size) |
2722971c | 1260 | { |
6709dbbb | 1261 | struct xt_match *match; |
2722971c | 1262 | |
fd0ec0e6 JE |
1263 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
1264 | m->u.user.revision); | |
d7cdf816 | 1265 | if (IS_ERR(match)) |
fd0ec0e6 | 1266 | return PTR_ERR(match); |
d7cdf816 | 1267 | |
2722971c | 1268 | m->u.kernel.match = match; |
9fa492cd | 1269 | *size += xt_compat_match_offset(match); |
4c1b52bc DM |
1270 | return 0; |
1271 | } | |
1272 | ||
0559518b | 1273 | static void compat_release_entry(struct compat_ipt_entry *e) |
4c1b52bc | 1274 | { |
87a2e70d | 1275 | struct xt_entry_target *t; |
dcea992a | 1276 | struct xt_entry_match *ematch; |
4c1b52bc | 1277 | |
4c1b52bc | 1278 | /* Cleanup all matches */ |
dcea992a | 1279 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1280 | module_put(ematch->u.kernel.match->me); |
73cd598d | 1281 | t = compat_ipt_get_target(e); |
4c1b52bc | 1282 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1283 | } |
1284 | ||
022748a9 | 1285 | static int |
73cd598d | 1286 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1287 | struct xt_table_info *newinfo, |
1288 | unsigned int *size, | |
d5d1baa1 | 1289 | const unsigned char *base, |
09d96860 | 1290 | const unsigned char *limit) |
2722971c | 1291 | { |
dcea992a | 1292 | struct xt_entry_match *ematch; |
87a2e70d | 1293 | struct xt_entry_target *t; |
6709dbbb | 1294 | struct xt_target *target; |
e5b5ef7d | 1295 | unsigned int entry_offset; |
b0a6363c | 1296 | unsigned int j; |
09d96860 | 1297 | int ret, off; |
2722971c | 1298 | |
3666ed1c | 1299 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
6e94e0cf | 1300 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit || |
d7cdf816 | 1301 | (unsigned char *)e + e->next_offset > limit) |
2722971c | 1302 | return -EINVAL; |
2722971c DM |
1303 | |
1304 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
d7cdf816 | 1305 | sizeof(struct compat_xt_entry_target)) |
2722971c | 1306 | return -EINVAL; |
2722971c | 1307 | |
aa412ba2 FW |
1308 | if (!ip_checkentry(&e->ip)) |
1309 | return -EINVAL; | |
1310 | ||
ce683e5f | 1311 | ret = xt_compat_check_entry_offsets(e, e->elems, |
fc1221b3 | 1312 | e->target_offset, e->next_offset); |
a96be246 DM |
1313 | if (ret) |
1314 | return ret; | |
590bdf7f | 1315 | |
30c08c41 | 1316 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1317 | entry_offset = (void *)e - (void *)base; |
1318 | j = 0; | |
dcea992a | 1319 | xt_ematch_foreach(ematch, e) { |
7d3f843e | 1320 | ret = compat_find_calc_match(ematch, &e->ip, &off); |
dcea992a | 1321 | if (ret != 0) |
6bdb331b JE |
1322 | goto release_matches; |
1323 | ++j; | |
dcea992a | 1324 | } |
2722971c | 1325 | |
73cd598d | 1326 | t = compat_ipt_get_target(e); |
d2a7b6ba JE |
1327 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
1328 | t->u.user.revision); | |
1329 | if (IS_ERR(target)) { | |
d2a7b6ba | 1330 | ret = PTR_ERR(target); |
4c1b52bc | 1331 | goto release_matches; |
2722971c DM |
1332 | } |
1333 | t->u.kernel.target = target; | |
1334 | ||
9fa492cd | 1335 | off += xt_compat_target_offset(target); |
2722971c | 1336 | *size += off; |
b386d9f5 | 1337 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1338 | if (ret) |
1339 | goto out; | |
1340 | ||
2722971c | 1341 | return 0; |
bec71b16 | 1342 | |
2722971c | 1343 | out: |
bec71b16 | 1344 | module_put(t->u.kernel.target->me); |
4c1b52bc | 1345 | release_matches: |
6bdb331b JE |
1346 | xt_ematch_foreach(ematch, e) { |
1347 | if (j-- == 0) | |
dcea992a | 1348 | break; |
6bdb331b JE |
1349 | module_put(ematch->u.kernel.match->me); |
1350 | } | |
2722971c DM |
1351 | return ret; |
1352 | } | |
1353 | ||
0188346f | 1354 | static void |
73cd598d | 1355 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
7d3f843e | 1356 | unsigned int *size, |
4b478248 | 1357 | struct xt_table_info *newinfo, unsigned char *base) |
2722971c | 1358 | { |
87a2e70d | 1359 | struct xt_entry_target *t; |
2722971c DM |
1360 | struct ipt_entry *de; |
1361 | unsigned int origsize; | |
0188346f | 1362 | int h; |
dcea992a | 1363 | struct xt_entry_match *ematch; |
2722971c | 1364 | |
2722971c | 1365 | origsize = *size; |
68ad546a | 1366 | de = *dstptr; |
2722971c | 1367 | memcpy(de, e, sizeof(struct ipt_entry)); |
73cd598d | 1368 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1369 | |
73cd598d | 1370 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1371 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1372 | ||
0188346f FW |
1373 | xt_ematch_foreach(ematch, e) |
1374 | xt_compat_match_from_user(ematch, dstptr, size); | |
1375 | ||
2722971c | 1376 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1377 | t = compat_ipt_get_target(e); |
9fa492cd | 1378 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1379 | |
1380 | de->next_offset = e->next_offset - (origsize - *size); | |
09d96860 | 1381 | |
6e23ae2a | 1382 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1383 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1384 | newinfo->hook_entry[h] -= origsize - *size; | |
1385 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1386 | newinfo->underflow[h] -= origsize - *size; | |
1387 | } | |
f6677f43 DM |
1388 | } |
1389 | ||
1da177e4 | 1390 | static int |
a83d8e8d | 1391 | translate_compat_table(struct net *net, |
4b478248 PM |
1392 | struct xt_table_info **pinfo, |
1393 | void **pentry0, | |
7d3f843e | 1394 | const struct compat_ipt_replace *compatr) |
1da177e4 | 1395 | { |
920b868a | 1396 | unsigned int i, j; |
2722971c DM |
1397 | struct xt_table_info *newinfo, *info; |
1398 | void *pos, *entry0, *entry1; | |
72b2b1dd | 1399 | struct compat_ipt_entry *iter0; |
09d96860 | 1400 | struct ipt_replace repl; |
2722971c | 1401 | unsigned int size; |
0559518b | 1402 | int ret; |
1da177e4 | 1403 | |
2722971c DM |
1404 | info = *pinfo; |
1405 | entry0 = *pentry0; | |
7d3f843e FW |
1406 | size = compatr->size; |
1407 | info->number = compatr->num_entries; | |
2722971c | 1408 | |
920b868a | 1409 | j = 0; |
2722971c | 1410 | xt_compat_lock(AF_INET); |
9782a11e FW |
1411 | ret = xt_compat_init_offsets(AF_INET, compatr->num_entries); |
1412 | if (ret) | |
1413 | goto out_unlock; | |
2722971c | 1414 | /* Walk through entries, checking offsets. */ |
7d3f843e | 1415 | xt_entry_foreach(iter0, entry0, compatr->size) { |
72b2b1dd | 1416 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
6b4ff2d7 | 1417 | entry0, |
09d96860 | 1418 | entry0 + compatr->size); |
72b2b1dd | 1419 | if (ret != 0) |
0559518b JE |
1420 | goto out_unlock; |
1421 | ++j; | |
72b2b1dd | 1422 | } |
2722971c DM |
1423 | |
1424 | ret = -EINVAL; | |
d7cdf816 | 1425 | if (j != compatr->num_entries) |
2722971c | 1426 | goto out_unlock; |
2722971c | 1427 | |
2722971c DM |
1428 | ret = -ENOMEM; |
1429 | newinfo = xt_alloc_table_info(size); | |
1430 | if (!newinfo) | |
1431 | goto out_unlock; | |
1432 | ||
b29c457a FW |
1433 | memset(newinfo->entries, 0, size); |
1434 | ||
7d3f843e | 1435 | newinfo->number = compatr->num_entries; |
6e23ae2a | 1436 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
09d96860 FW |
1437 | newinfo->hook_entry[i] = compatr->hook_entry[i]; |
1438 | newinfo->underflow[i] = compatr->underflow[i]; | |
2722971c | 1439 | } |
482cfc31 | 1440 | entry1 = newinfo->entries; |
2722971c | 1441 | pos = entry1; |
7d3f843e | 1442 | size = compatr->size; |
0188346f FW |
1443 | xt_entry_foreach(iter0, entry0, compatr->size) |
1444 | compat_copy_entry_from_user(iter0, &pos, &size, | |
1445 | newinfo, entry1); | |
1446 | ||
09d96860 FW |
1447 | /* all module references in entry0 are now gone. |
1448 | * entry1/newinfo contains a 64bit ruleset that looks exactly as | |
1449 | * generated by 64bit userspace. | |
1450 | * | |
1451 | * Call standard translate_table() to validate all hook_entrys, | |
1452 | * underflows, check for loops, etc. | |
1453 | */ | |
b386d9f5 | 1454 | xt_compat_flush_offsets(AF_INET); |
2722971c | 1455 | xt_compat_unlock(AF_INET); |
2722971c | 1456 | |
09d96860 | 1457 | memcpy(&repl, compatr, sizeof(*compatr)); |
2722971c | 1458 | |
09d96860 FW |
1459 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1460 | repl.hook_entry[i] = newinfo->hook_entry[i]; | |
1461 | repl.underflow[i] = newinfo->underflow[i]; | |
4c1b52bc | 1462 | } |
f6677f43 | 1463 | |
09d96860 FW |
1464 | repl.num_counters = 0; |
1465 | repl.counters = NULL; | |
1466 | repl.size = newinfo->size; | |
1467 | ret = translate_table(net, newinfo, entry1, &repl); | |
1468 | if (ret) | |
1469 | goto free_newinfo; | |
1470 | ||
2722971c DM |
1471 | *pinfo = newinfo; |
1472 | *pentry0 = entry1; | |
1473 | xt_free_table_info(info); | |
1474 | return 0; | |
1da177e4 | 1475 | |
2722971c DM |
1476 | free_newinfo: |
1477 | xt_free_table_info(newinfo); | |
09d96860 FW |
1478 | return ret; |
1479 | out_unlock: | |
1480 | xt_compat_flush_offsets(AF_INET); | |
1481 | xt_compat_unlock(AF_INET); | |
7d3f843e | 1482 | xt_entry_foreach(iter0, entry0, compatr->size) { |
0559518b | 1483 | if (j-- == 0) |
72b2b1dd | 1484 | break; |
0559518b JE |
1485 | compat_release_entry(iter0); |
1486 | } | |
1da177e4 LT |
1487 | return ret; |
1488 | } | |
1489 | ||
1490 | static int | |
c2f12630 | 1491 | compat_do_replace(struct net *net, sockptr_t arg, unsigned int len) |
1da177e4 LT |
1492 | { |
1493 | int ret; | |
2722971c DM |
1494 | struct compat_ipt_replace tmp; |
1495 | struct xt_table_info *newinfo; | |
1496 | void *loc_cpu_entry; | |
72b2b1dd | 1497 | struct ipt_entry *iter; |
1da177e4 | 1498 | |
0c83842d ED |
1499 | if (len < sizeof(tmp)) |
1500 | return -EINVAL; | |
c2f12630 | 1501 | if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0) |
1da177e4 LT |
1502 | return -EFAULT; |
1503 | ||
ee4bb818 | 1504 | /* overflow check */ |
ee4bb818 KK |
1505 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1506 | return -ENOMEM; | |
1086bbe9 DJ |
1507 | if (tmp.num_counters == 0) |
1508 | return -EINVAL; | |
65acf6e0 ED |
1509 | if ((u64)len < (u64)tmp.size + sizeof(tmp)) |
1510 | return -EINVAL; | |
1086bbe9 | 1511 | |
78b79876 | 1512 | tmp.name[sizeof(tmp.name)-1] = 0; |
ee4bb818 | 1513 | |
2e4e6a17 | 1514 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1515 | if (!newinfo) |
1516 | return -ENOMEM; | |
1517 | ||
482cfc31 | 1518 | loc_cpu_entry = newinfo->entries; |
d3c48151 CH |
1519 | if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp), |
1520 | tmp.size) != 0) { | |
1da177e4 LT |
1521 | ret = -EFAULT; |
1522 | goto free_newinfo; | |
1523 | } | |
1524 | ||
7d3f843e | 1525 | ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp); |
2722971c | 1526 | if (ret != 0) |
1da177e4 | 1527 | goto free_newinfo; |
1da177e4 | 1528 | |
34bd137b | 1529 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1530 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1531 | if (ret) |
1532 | goto free_newinfo_untrans; | |
1533 | return 0; | |
1da177e4 | 1534 | |
2722971c | 1535 | free_newinfo_untrans: |
72b2b1dd | 1536 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1537 | cleanup_entry(iter, net); |
2722971c DM |
1538 | free_newinfo: |
1539 | xt_free_table_info(newinfo); | |
1540 | return ret; | |
1541 | } | |
1da177e4 | 1542 | |
4b478248 | 1543 | struct compat_ipt_get_entries { |
12b00c2c | 1544 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c | 1545 | compat_uint_t size; |
6daf1414 | 1546 | struct compat_ipt_entry entrytable[]; |
2722971c | 1547 | }; |
1da177e4 | 1548 | |
4b478248 PM |
1549 | static int |
1550 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1551 | void __user *userptr) | |
2722971c | 1552 | { |
2722971c | 1553 | struct xt_counters *counters; |
d3d40f23 | 1554 | const struct xt_table_info *private = table->private; |
2722971c DM |
1555 | void __user *pos; |
1556 | unsigned int size; | |
1557 | int ret = 0; | |
a18aa31b | 1558 | unsigned int i = 0; |
72b2b1dd | 1559 | struct ipt_entry *iter; |
1da177e4 | 1560 | |
2722971c DM |
1561 | counters = alloc_counters(table); |
1562 | if (IS_ERR(counters)) | |
1563 | return PTR_ERR(counters); | |
1564 | ||
2722971c DM |
1565 | pos = userptr; |
1566 | size = total_size; | |
482cfc31 | 1567 | xt_entry_foreach(iter, private->entries, total_size) { |
72b2b1dd | 1568 | ret = compat_copy_entry_to_user(iter, &pos, |
6b4ff2d7 | 1569 | &size, counters, i++); |
72b2b1dd JE |
1570 | if (ret != 0) |
1571 | break; | |
1572 | } | |
2722971c | 1573 | |
2722971c DM |
1574 | vfree(counters); |
1575 | return ret; | |
1da177e4 LT |
1576 | } |
1577 | ||
1578 | static int | |
34bd137b AD |
1579 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1580 | int *len) | |
1da177e4 | 1581 | { |
2722971c DM |
1582 | int ret; |
1583 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1584 | struct xt_table *t; |
1da177e4 | 1585 | |
d7cdf816 | 1586 | if (*len < sizeof(get)) |
1da177e4 LT |
1587 | return -EINVAL; |
1588 | ||
2722971c DM |
1589 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1590 | return -EFAULT; | |
1da177e4 | 1591 | |
d7cdf816 | 1592 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) |
2722971c | 1593 | return -EINVAL; |
d7cdf816 | 1594 | |
b301f253 | 1595 | get.name[sizeof(get.name) - 1] = '\0'; |
1da177e4 | 1596 | |
2722971c | 1597 | xt_compat_lock(AF_INET); |
34bd137b | 1598 | t = xt_find_table_lock(net, AF_INET, get.name); |
03d13b68 | 1599 | if (!IS_ERR(t)) { |
abe7034b | 1600 | const struct xt_table_info *private = t->private; |
2722971c | 1601 | struct xt_table_info info; |
2722971c | 1602 | ret = compat_table_info(private, &info); |
d7cdf816 | 1603 | if (!ret && get.size == info.size) |
2722971c | 1604 | ret = compat_copy_entries_to_user(private->size, |
4b478248 | 1605 | t, uptr->entrytable); |
d7cdf816 | 1606 | else if (!ret) |
544473c1 | 1607 | ret = -EAGAIN; |
d7cdf816 | 1608 | |
b386d9f5 | 1609 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1610 | module_put(t->me); |
1611 | xt_table_unlock(t); | |
1612 | } else | |
03d13b68 | 1613 | ret = PTR_ERR(t); |
1da177e4 | 1614 | |
2722971c DM |
1615 | xt_compat_unlock(AF_INET); |
1616 | return ret; | |
1617 | } | |
2722971c | 1618 | #endif |
1da177e4 LT |
1619 | |
1620 | static int | |
c2f12630 | 1621 | do_ipt_set_ctl(struct sock *sk, int cmd, sockptr_t arg, unsigned int len) |
1da177e4 LT |
1622 | { |
1623 | int ret; | |
1624 | ||
52e804c6 | 1625 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1626 | return -EPERM; |
1627 | ||
1628 | switch (cmd) { | |
1629 | case IPT_SO_SET_REPLACE: | |
47a6959f | 1630 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
89c53c14 | 1631 | if (in_compat_syscall()) |
c2f12630 | 1632 | ret = compat_do_replace(sock_net(sk), arg, len); |
89c53c14 CH |
1633 | else |
1634 | #endif | |
c2f12630 | 1635 | ret = do_replace(sock_net(sk), arg, len); |
1da177e4 LT |
1636 | break; |
1637 | ||
1638 | case IPT_SO_SET_ADD_COUNTERS: | |
c2f12630 | 1639 | ret = do_add_counters(sock_net(sk), arg, len); |
1da177e4 LT |
1640 | break; |
1641 | ||
1642 | default: | |
1da177e4 LT |
1643 | ret = -EINVAL; |
1644 | } | |
1645 | ||
1646 | return ret; | |
1647 | } | |
1648 | ||
1649 | static int | |
1650 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1651 | { | |
1652 | int ret; | |
1653 | ||
52e804c6 | 1654 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1655 | return -EPERM; |
1656 | ||
1657 | switch (cmd) { | |
2722971c | 1658 | case IPT_SO_GET_INFO: |
89c53c14 | 1659 | ret = get_info(sock_net(sk), user, len); |
2722971c | 1660 | break; |
1da177e4 | 1661 | |
2722971c | 1662 | case IPT_SO_GET_ENTRIES: |
47a6959f | 1663 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
89c53c14 CH |
1664 | if (in_compat_syscall()) |
1665 | ret = compat_get_entries(sock_net(sk), user, len); | |
1666 | else | |
1667 | #endif | |
1668 | ret = get_entries(sock_net(sk), user, len); | |
1da177e4 | 1669 | break; |
1da177e4 LT |
1670 | |
1671 | case IPT_SO_GET_REVISION_MATCH: | |
1672 | case IPT_SO_GET_REVISION_TARGET: { | |
12b00c2c | 1673 | struct xt_get_revision rev; |
2e4e6a17 | 1674 | int target; |
1da177e4 LT |
1675 | |
1676 | if (*len != sizeof(rev)) { | |
1677 | ret = -EINVAL; | |
1678 | break; | |
1679 | } | |
1680 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1681 | ret = -EFAULT; | |
1682 | break; | |
1683 | } | |
78b79876 | 1684 | rev.name[sizeof(rev.name)-1] = 0; |
1da177e4 LT |
1685 | |
1686 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 1687 | target = 1; |
1da177e4 | 1688 | else |
2e4e6a17 | 1689 | target = 0; |
1da177e4 | 1690 | |
2e4e6a17 HW |
1691 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
1692 | rev.revision, | |
1693 | target, &ret), | |
1da177e4 LT |
1694 | "ipt_%s", rev.name); |
1695 | break; | |
1696 | } | |
1697 | ||
1698 | default: | |
1da177e4 LT |
1699 | ret = -EINVAL; |
1700 | } | |
1701 | ||
1702 | return ret; | |
1703 | } | |
1704 | ||
b9e69e12 FW |
1705 | static void __ipt_unregister_table(struct net *net, struct xt_table *table) |
1706 | { | |
1707 | struct xt_table_info *private; | |
1708 | void *loc_cpu_entry; | |
1709 | struct module *table_owner = table->me; | |
1710 | struct ipt_entry *iter; | |
1711 | ||
1712 | private = xt_unregister_table(table); | |
1713 | ||
1714 | /* Decrease module usage counts and free resources */ | |
1715 | loc_cpu_entry = private->entries; | |
1716 | xt_entry_foreach(iter, loc_cpu_entry, private->size) | |
1717 | cleanup_entry(iter, net); | |
1718 | if (private->number > private->initial_entries) | |
1719 | module_put(table_owner); | |
1720 | xt_free_table_info(private); | |
1721 | } | |
1722 | ||
a67dd266 FW |
1723 | int ipt_register_table(struct net *net, const struct xt_table *table, |
1724 | const struct ipt_replace *repl, | |
ae689334 | 1725 | const struct nf_hook_ops *template_ops) |
1da177e4 | 1726 | { |
ae689334 FW |
1727 | struct nf_hook_ops *ops; |
1728 | unsigned int num_ops; | |
1729 | int ret, i; | |
2e4e6a17 | 1730 | struct xt_table_info *newinfo; |
f3c5c1bf | 1731 | struct xt_table_info bootstrap = {0}; |
31836064 | 1732 | void *loc_cpu_entry; |
a98da11d | 1733 | struct xt_table *new_table; |
1da177e4 | 1734 | |
2e4e6a17 | 1735 | newinfo = xt_alloc_table_info(repl->size); |
a67dd266 FW |
1736 | if (!newinfo) |
1737 | return -ENOMEM; | |
1da177e4 | 1738 | |
482cfc31 | 1739 | loc_cpu_entry = newinfo->entries; |
31836064 | 1740 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
1da177e4 | 1741 | |
0f234214 | 1742 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
ae689334 FW |
1743 | if (ret != 0) { |
1744 | xt_free_table_info(newinfo); | |
1745 | return ret; | |
1746 | } | |
1da177e4 | 1747 | |
44d34e72 | 1748 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 1749 | if (IS_ERR(new_table)) { |
0af8c09c PT |
1750 | struct ipt_entry *iter; |
1751 | ||
1752 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) | |
1753 | cleanup_entry(iter, net); | |
ae689334 FW |
1754 | xt_free_table_info(newinfo); |
1755 | return PTR_ERR(new_table); | |
1da177e4 LT |
1756 | } |
1757 | ||
ae689334 FW |
1758 | /* No template? No need to do anything. This is used by 'nat' table, it registers |
1759 | * with the nat core instead of the netfilter core. | |
1760 | */ | |
1761 | if (!template_ops) | |
ba7d284a | 1762 | return 0; |
b9e69e12 | 1763 | |
ae689334 FW |
1764 | num_ops = hweight32(table->valid_hooks); |
1765 | if (num_ops == 0) { | |
1766 | ret = -EINVAL; | |
1767 | goto out_free; | |
b9e69e12 FW |
1768 | } |
1769 | ||
ae689334 FW |
1770 | ops = kmemdup(template_ops, sizeof(*ops) * num_ops, GFP_KERNEL); |
1771 | if (!ops) { | |
1772 | ret = -ENOMEM; | |
1773 | goto out_free; | |
1774 | } | |
1775 | ||
1776 | for (i = 0; i < num_ops; i++) | |
1777 | ops[i].priv = new_table; | |
1778 | ||
1779 | new_table->ops = ops; | |
1780 | ||
1781 | ret = nf_register_net_hooks(net, ops, num_ops); | |
1782 | if (ret != 0) | |
1783 | goto out_free; | |
1784 | ||
a67dd266 | 1785 | return ret; |
44d34e72 AD |
1786 | |
1787 | out_free: | |
ae689334 | 1788 | __ipt_unregister_table(net, new_table); |
a67dd266 | 1789 | return ret; |
1da177e4 LT |
1790 | } |
1791 | ||
ae689334 | 1792 | void ipt_unregister_table_pre_exit(struct net *net, const char *name) |
1cbf9098 | 1793 | { |
20a9df33 FW |
1794 | struct xt_table *table = xt_find_table(net, NFPROTO_IPV4, name); |
1795 | ||
1796 | if (table) | |
ae689334 | 1797 | nf_unregister_net_hooks(net, table->ops, hweight32(table->valid_hooks)); |
1cbf9098 DW |
1798 | } |
1799 | ||
20a9df33 | 1800 | void ipt_unregister_table_exit(struct net *net, const char *name) |
1cbf9098 | 1801 | { |
20a9df33 FW |
1802 | struct xt_table *table = xt_find_table(net, NFPROTO_IPV4, name); |
1803 | ||
1804 | if (table) | |
1805 | __ipt_unregister_table(net, table); | |
1cbf9098 DW |
1806 | } |
1807 | ||
4538506b JE |
1808 | static struct xt_target ipt_builtin_tg[] __read_mostly = { |
1809 | { | |
243bf6e2 | 1810 | .name = XT_STANDARD_TARGET, |
4538506b JE |
1811 | .targetsize = sizeof(int), |
1812 | .family = NFPROTO_IPV4, | |
47a6959f | 1813 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
4538506b JE |
1814 | .compatsize = sizeof(compat_int_t), |
1815 | .compat_from_user = compat_standard_from_user, | |
1816 | .compat_to_user = compat_standard_to_user, | |
2722971c | 1817 | #endif |
4538506b JE |
1818 | }, |
1819 | { | |
243bf6e2 | 1820 | .name = XT_ERROR_TARGET, |
4538506b | 1821 | .target = ipt_error, |
12b00c2c | 1822 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
1823 | .family = NFPROTO_IPV4, |
1824 | }, | |
1da177e4 LT |
1825 | }; |
1826 | ||
1827 | static struct nf_sockopt_ops ipt_sockopts = { | |
1828 | .pf = PF_INET, | |
1829 | .set_optmin = IPT_BASE_CTL, | |
1830 | .set_optmax = IPT_SO_SET_MAX+1, | |
1831 | .set = do_ipt_set_ctl, | |
1832 | .get_optmin = IPT_BASE_CTL, | |
1833 | .get_optmax = IPT_SO_GET_MAX+1, | |
1834 | .get = do_ipt_get_ctl, | |
16fcec35 | 1835 | .owner = THIS_MODULE, |
1da177e4 LT |
1836 | }; |
1837 | ||
3cb609d5 AD |
1838 | static int __net_init ip_tables_net_init(struct net *net) |
1839 | { | |
383ca5b8 | 1840 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
1841 | } |
1842 | ||
1843 | static void __net_exit ip_tables_net_exit(struct net *net) | |
1844 | { | |
383ca5b8 | 1845 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
1846 | } |
1847 | ||
1848 | static struct pernet_operations ip_tables_net_ops = { | |
1849 | .init = ip_tables_net_init, | |
1850 | .exit = ip_tables_net_exit, | |
1851 | }; | |
1852 | ||
65b4b4e8 | 1853 | static int __init ip_tables_init(void) |
1da177e4 LT |
1854 | { |
1855 | int ret; | |
1856 | ||
3cb609d5 | 1857 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
1858 | if (ret < 0) |
1859 | goto err1; | |
2e4e6a17 | 1860 | |
25985edc | 1861 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 1862 | ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 PM |
1863 | if (ret < 0) |
1864 | goto err2; | |
1da177e4 LT |
1865 | |
1866 | /* Register setsockopt */ | |
1867 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 | 1868 | if (ret < 0) |
36ce9982 | 1869 | goto err4; |
1da177e4 | 1870 | |
1da177e4 | 1871 | return 0; |
0eff66e6 | 1872 | |
0eff66e6 | 1873 | err4: |
4538506b | 1874 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 | 1875 | err2: |
3cb609d5 | 1876 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
1877 | err1: |
1878 | return ret; | |
1da177e4 LT |
1879 | } |
1880 | ||
65b4b4e8 | 1881 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
1882 | { |
1883 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 1884 | |
4538506b | 1885 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
3cb609d5 | 1886 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
1887 | } |
1888 | ||
1889 | EXPORT_SYMBOL(ipt_register_table); | |
1cbf9098 DW |
1890 | EXPORT_SYMBOL(ipt_unregister_table_pre_exit); |
1891 | EXPORT_SYMBOL(ipt_unregister_table_exit); | |
1da177e4 | 1892 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
1893 | module_init(ip_tables_init); |
1894 | module_exit(ip_tables_fini); |