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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Packet matching code. | |
3 | * | |
4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
2e4e6a17 | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
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> |
7c0f6ba6 | 23 | #include <linux/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 | ||
e3eaa991 JE |
38 | void *ipt_alloc_initial_table(const struct xt_table *info) |
39 | { | |
40 | return xt_alloc_initial_table(ipt, IPT); | |
41 | } | |
42 | EXPORT_SYMBOL_GPL(ipt_alloc_initial_table); | |
43 | ||
1da177e4 | 44 | /* Returns whether matches rule or not. */ |
022748a9 | 45 | /* Performance critical - called for every packet */ |
9c547959 | 46 | static inline bool |
1da177e4 LT |
47 | ip_packet_match(const struct iphdr *ip, |
48 | const char *indev, | |
49 | const char *outdev, | |
50 | const struct ipt_ip *ipinfo, | |
51 | int isfrag) | |
52 | { | |
1da177e4 LT |
53 | unsigned long ret; |
54 | ||
c37a2dfa JP |
55 | if (NF_INVF(ipinfo, IPT_INV_SRCIP, |
56 | (ip->saddr & ipinfo->smsk.s_addr) != ipinfo->src.s_addr) || | |
57 | NF_INVF(ipinfo, IPT_INV_DSTIP, | |
58 | (ip->daddr & ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr)) | |
9c547959 | 59 | return false; |
1da177e4 | 60 | |
b8dfe498 | 61 | ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask); |
1da177e4 | 62 | |
c37a2dfa | 63 | if (NF_INVF(ipinfo, IPT_INV_VIA_IN, ret != 0)) |
9c547959 | 64 | return false; |
1da177e4 | 65 | |
b8dfe498 | 66 | ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
1da177e4 | 67 | |
c37a2dfa | 68 | if (NF_INVF(ipinfo, IPT_INV_VIA_OUT, ret != 0)) |
9c547959 | 69 | return false; |
1da177e4 LT |
70 | |
71 | /* Check specific protocol */ | |
3666ed1c | 72 | if (ipinfo->proto && |
c37a2dfa | 73 | NF_INVF(ipinfo, IPT_INV_PROTO, ip->protocol != ipinfo->proto)) |
9c547959 | 74 | return false; |
1da177e4 LT |
75 | |
76 | /* If we have a fragment rule but the packet is not a fragment | |
77 | * then we return zero */ | |
c37a2dfa JP |
78 | if (NF_INVF(ipinfo, IPT_INV_FRAG, |
79 | (ipinfo->flags & IPT_F_FRAG) && !isfrag)) | |
9c547959 | 80 | return false; |
1da177e4 | 81 | |
9c547959 | 82 | return true; |
1da177e4 LT |
83 | } |
84 | ||
022748a9 | 85 | static bool |
1da177e4 LT |
86 | ip_checkentry(const struct ipt_ip *ip) |
87 | { | |
d7cdf816 | 88 | if (ip->flags & ~IPT_F_MASK) |
ccb79bdc | 89 | return false; |
d7cdf816 | 90 | if (ip->invflags & ~IPT_INV_MASK) |
ccb79bdc | 91 | return false; |
ccb79bdc | 92 | return true; |
1da177e4 LT |
93 | } |
94 | ||
95 | static unsigned int | |
4b560b44 | 96 | ipt_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 97 | { |
e87cc472 | 98 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
99 | |
100 | return NF_DROP; | |
101 | } | |
102 | ||
022748a9 | 103 | /* Performance critical */ |
1da177e4 | 104 | static inline struct ipt_entry * |
d5d1baa1 | 105 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
106 | { |
107 | return (struct ipt_entry *)(base + offset); | |
108 | } | |
109 | ||
ba9dda3a | 110 | /* All zeroes == unconditional rule. */ |
022748a9 | 111 | /* Mildly perf critical (only if packet tracing is on) */ |
54d83fc7 | 112 | static inline bool unconditional(const struct ipt_entry *e) |
ba9dda3a | 113 | { |
47901dc2 | 114 | static const struct ipt_ip uncond; |
ba9dda3a | 115 | |
54d83fc7 FW |
116 | return e->target_offset == sizeof(struct ipt_entry) && |
117 | memcmp(&e->ip, &uncond, sizeof(uncond)) == 0; | |
ba9dda3a JK |
118 | } |
119 | ||
d5d1baa1 | 120 | /* for const-correctness */ |
87a2e70d | 121 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
122 | ipt_get_target_c(const struct ipt_entry *e) |
123 | { | |
124 | return ipt_get_target((struct ipt_entry *)e); | |
125 | } | |
126 | ||
f0165888 | 127 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
022748a9 | 128 | static const char *const hooknames[] = { |
6e23ae2a PM |
129 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
130 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 131 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
132 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
133 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
134 | }; |
135 | ||
136 | enum nf_ip_trace_comments { | |
137 | NF_IP_TRACE_COMMENT_RULE, | |
138 | NF_IP_TRACE_COMMENT_RETURN, | |
139 | NF_IP_TRACE_COMMENT_POLICY, | |
140 | }; | |
141 | ||
022748a9 | 142 | static const char *const comments[] = { |
ba9dda3a JK |
143 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
144 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
145 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
146 | }; | |
147 | ||
549d2d41 | 148 | static const struct nf_loginfo trace_loginfo = { |
ba9dda3a JK |
149 | .type = NF_LOG_TYPE_LOG, |
150 | .u = { | |
151 | .log = { | |
152 | .level = 4, | |
ff107d27 | 153 | .logflags = NF_LOG_DEFAULT_MASK, |
ba9dda3a JK |
154 | }, |
155 | }, | |
156 | }; | |
157 | ||
022748a9 | 158 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 159 | static inline int |
d5d1baa1 | 160 | get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e, |
4f2f6f23 JE |
161 | const char *hookname, const char **chainname, |
162 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 163 | { |
87a2e70d | 164 | const struct xt_standard_target *t = (void *)ipt_get_target_c(s); |
ba9dda3a | 165 | |
243bf6e2 | 166 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
167 | /* Head of user chain: ERROR target with chainname */ |
168 | *chainname = t->target.data; | |
169 | (*rulenum) = 0; | |
170 | } else if (s == e) { | |
171 | (*rulenum)++; | |
172 | ||
54d83fc7 | 173 | if (unconditional(s) && |
3666ed1c | 174 | strcmp(t->target.u.kernel.target->name, |
243bf6e2 | 175 | XT_STANDARD_TARGET) == 0 && |
54d83fc7 | 176 | t->verdict < 0) { |
ba9dda3a JK |
177 | /* Tail of chains: STANDARD target (return/policy) */ |
178 | *comment = *chainname == hookname | |
4f2f6f23 JE |
179 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
180 | : comments[NF_IP_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
181 | } |
182 | return 1; | |
183 | } else | |
184 | (*rulenum)++; | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
9dff2c96 EB |
189 | static void trace_packet(struct net *net, |
190 | const struct sk_buff *skb, | |
ba9dda3a JK |
191 | unsigned int hook, |
192 | const struct net_device *in, | |
193 | const struct net_device *out, | |
ecb6f85e | 194 | const char *tablename, |
d5d1baa1 JE |
195 | const struct xt_table_info *private, |
196 | const struct ipt_entry *e) | |
ba9dda3a | 197 | { |
5452e425 | 198 | const struct ipt_entry *root; |
4f2f6f23 | 199 | const char *hookname, *chainname, *comment; |
72b2b1dd | 200 | const struct ipt_entry *iter; |
ba9dda3a JK |
201 | unsigned int rulenum = 0; |
202 | ||
482cfc31 | 203 | root = get_entry(private->entries, private->hook_entry[hook]); |
ba9dda3a | 204 | |
4f2f6f23 JE |
205 | hookname = chainname = hooknames[hook]; |
206 | comment = comments[NF_IP_TRACE_COMMENT_RULE]; | |
ba9dda3a | 207 | |
72b2b1dd JE |
208 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
209 | if (get_chainname_rulenum(iter, e, hookname, | |
210 | &chainname, &comment, &rulenum) != 0) | |
211 | break; | |
ba9dda3a | 212 | |
4017a7ee PNA |
213 | nf_log_trace(net, AF_INET, hook, skb, in, out, &trace_loginfo, |
214 | "TRACE: %s:%s:%s:%u ", | |
215 | tablename, chainname, comment, rulenum); | |
ba9dda3a JK |
216 | } |
217 | #endif | |
218 | ||
6c7941de | 219 | static inline |
98e86403 JE |
220 | struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry) |
221 | { | |
222 | return (void *)entry + entry->next_offset; | |
223 | } | |
224 | ||
1da177e4 LT |
225 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
226 | unsigned int | |
3db05fea | 227 | ipt_do_table(struct sk_buff *skb, |
1c491ba2 | 228 | const struct nf_hook_state *state, |
e60a13e0 | 229 | struct xt_table *table) |
1da177e4 | 230 | { |
6cb8ff3f | 231 | unsigned int hook = state->hook; |
1da177e4 | 232 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
5452e425 | 233 | const struct iphdr *ip; |
1da177e4 LT |
234 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
235 | unsigned int verdict = NF_DROP; | |
236 | const char *indev, *outdev; | |
d5d1baa1 | 237 | const void *table_base; |
f3c5c1bf | 238 | struct ipt_entry *e, **jumpstack; |
7814b6ec | 239 | unsigned int stackidx, cpu; |
d5d1baa1 | 240 | const struct xt_table_info *private; |
de74c169 | 241 | struct xt_action_param acpar; |
7f5c6d4f | 242 | unsigned int addend; |
1da177e4 LT |
243 | |
244 | /* Initialization */ | |
7814b6ec | 245 | stackidx = 0; |
3db05fea | 246 | ip = ip_hdr(skb); |
1c491ba2 DM |
247 | indev = state->in ? state->in->name : nulldevname; |
248 | outdev = state->out ? state->out->name : nulldevname; | |
1da177e4 LT |
249 | /* We handle fragments by dealing with the first fragment as |
250 | * if it was a normal packet. All other fragments are treated | |
251 | * normally, except that they will NEVER match rules that ask | |
252 | * things we don't know, ie. tcp syn flag or ports). If the | |
253 | * rule is also a fragment-specific rule, non-fragments won't | |
254 | * match it. */ | |
de74c169 JE |
255 | acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
256 | acpar.thoff = ip_hdrlen(skb); | |
b4ba2611 | 257 | acpar.hotdrop = false; |
613dbd95 | 258 | acpar.state = state; |
1da177e4 | 259 | |
9efdb14f | 260 | WARN_ON(!(table->valid_hooks & (1 << hook))); |
7f5c6d4f ED |
261 | local_bh_disable(); |
262 | addend = xt_write_recseq_begin(); | |
942e4a2b | 263 | private = table->private; |
f3c5c1bf | 264 | cpu = smp_processor_id(); |
b416c144 WD |
265 | /* |
266 | * Ensure we load private-> members after we've fetched the base | |
267 | * pointer. | |
268 | */ | |
269 | smp_read_barrier_depends(); | |
482cfc31 | 270 | table_base = private->entries; |
f3c5c1bf | 271 | jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; |
7814b6ec FW |
272 | |
273 | /* Switch to alternate jumpstack if we're being invoked via TEE. | |
274 | * TEE issues XT_CONTINUE verdict on original skb so we must not | |
275 | * clobber the jumpstack. | |
276 | * | |
277 | * For recursion via REJECT or SYNPROXY the stack will be clobbered | |
278 | * but it is no problem since absolute verdict is issued by these. | |
279 | */ | |
dcebd315 FW |
280 | if (static_key_false(&xt_tee_enabled)) |
281 | jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated); | |
78454473 | 282 | |
2e4e6a17 | 283 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 284 | |
1da177e4 | 285 | do { |
87a2e70d | 286 | const struct xt_entry_target *t; |
dcea992a | 287 | const struct xt_entry_match *ematch; |
71ae0dff | 288 | struct xt_counters *counter; |
a1ff4ac8 | 289 | |
9efdb14f | 290 | WARN_ON(!e); |
a1ff4ac8 | 291 | if (!ip_packet_match(ip, indev, outdev, |
de74c169 | 292 | &e->ip, acpar.fragoff)) { |
dcea992a | 293 | no_match: |
a1ff4ac8 JE |
294 | e = ipt_next_entry(e); |
295 | continue; | |
296 | } | |
1da177e4 | 297 | |
ef53d702 | 298 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
299 | acpar.match = ematch->u.kernel.match; |
300 | acpar.matchinfo = ematch->data; | |
301 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 302 | goto no_match; |
ef53d702 | 303 | } |
dcea992a | 304 | |
71ae0dff FW |
305 | counter = xt_get_this_cpu_counter(&e->counters); |
306 | ADD_COUNTER(*counter, skb->len, 1); | |
1da177e4 | 307 | |
a1ff4ac8 | 308 | t = ipt_get_target(e); |
9efdb14f | 309 | WARN_ON(!t->u.kernel.target); |
ba9dda3a | 310 | |
f0165888 | 311 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
312 | /* The packet is traced: log it */ |
313 | if (unlikely(skb->nf_trace)) | |
9dff2c96 EB |
314 | trace_packet(state->net, skb, hook, state->in, |
315 | state->out, table->name, private, e); | |
ba9dda3a | 316 | #endif |
a1ff4ac8 JE |
317 | /* Standard target? */ |
318 | if (!t->u.kernel.target->target) { | |
319 | int v; | |
320 | ||
87a2e70d | 321 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
322 | if (v < 0) { |
323 | /* Pop from stack? */ | |
243bf6e2 | 324 | if (v != XT_RETURN) { |
95c96174 | 325 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 326 | break; |
1da177e4 | 327 | } |
7814b6ec | 328 | if (stackidx == 0) { |
f3c5c1bf JE |
329 | e = get_entry(table_base, |
330 | private->underflow[hook]); | |
f3c5c1bf | 331 | } else { |
7814b6ec | 332 | e = jumpstack[--stackidx]; |
f3c5c1bf JE |
333 | e = ipt_next_entry(e); |
334 | } | |
a1ff4ac8 JE |
335 | continue; |
336 | } | |
3666ed1c | 337 | if (table_base + v != ipt_next_entry(e) && |
d7cdf816 | 338 | !(e->ip.flags & IPT_F_GOTO)) |
7814b6ec | 339 | jumpstack[stackidx++] = e; |
1da177e4 | 340 | |
a1ff4ac8 | 341 | e = get_entry(table_base, v); |
7a6b1c46 JE |
342 | continue; |
343 | } | |
344 | ||
de74c169 JE |
345 | acpar.target = t->u.kernel.target; |
346 | acpar.targinfo = t->data; | |
bb70dfa5 | 347 | |
de74c169 | 348 | verdict = t->u.kernel.target->target(skb, &acpar); |
9beceb54 TY |
349 | if (verdict == XT_CONTINUE) { |
350 | /* Target might have changed stuff. */ | |
351 | ip = ip_hdr(skb); | |
7a6b1c46 | 352 | e = ipt_next_entry(e); |
9beceb54 | 353 | } else { |
7a6b1c46 JE |
354 | /* Verdict */ |
355 | break; | |
9beceb54 | 356 | } |
b4ba2611 | 357 | } while (!acpar.hotdrop); |
7814b6ec | 358 | |
24cebe3f IM |
359 | xt_write_recseq_end(addend); |
360 | local_bh_enable(); | |
7f5c6d4f | 361 | |
b4ba2611 | 362 | if (acpar.hotdrop) |
1da177e4 LT |
363 | return NF_DROP; |
364 | else return verdict; | |
1da177e4 LT |
365 | } |
366 | ||
1da177e4 | 367 | /* Figures out from what hook each rule can be called: returns 0 if |
98dbbfc3 | 368 | there are loops. Puts hook bitmask in comefrom. */ |
1da177e4 | 369 | static int |
98dbbfc3 | 370 | mark_source_chains(const struct xt_table_info *newinfo, |
f4dc7771 FW |
371 | unsigned int valid_hooks, void *entry0, |
372 | unsigned int *offsets) | |
1da177e4 LT |
373 | { |
374 | unsigned int hook; | |
375 | ||
376 | /* No recursion; use packet counter to save back ptrs (reset | |
377 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 378 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 379 | unsigned int pos = newinfo->hook_entry[hook]; |
68ad546a | 380 | struct ipt_entry *e = entry0 + pos; |
1da177e4 LT |
381 | |
382 | if (!(valid_hooks & (1 << hook))) | |
383 | continue; | |
384 | ||
385 | /* Set initial back pointer. */ | |
386 | e->counters.pcnt = pos; | |
387 | ||
388 | for (;;) { | |
87a2e70d | 389 | const struct xt_standard_target *t |
d5d1baa1 | 390 | = (void *)ipt_get_target_c(e); |
e1b4b9f3 | 391 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 392 | |
d7cdf816 | 393 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) |
1da177e4 | 394 | return 0; |
d7cdf816 | 395 | |
9c547959 | 396 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
397 | |
398 | /* Unconditional return/END. */ | |
54d83fc7 | 399 | if ((unconditional(e) && |
3666ed1c | 400 | (strcmp(t->target.u.user.name, |
243bf6e2 | 401 | XT_STANDARD_TARGET) == 0) && |
54d83fc7 | 402 | t->verdict < 0) || visited) { |
1da177e4 LT |
403 | unsigned int oldpos, size; |
404 | ||
1f9352ae | 405 | if ((strcmp(t->target.u.user.name, |
24cebe3f | 406 | XT_STANDARD_TARGET) == 0) && |
d7cdf816 | 407 | t->verdict < -NF_MAX_VERDICT - 1) |
74c9c0c1 | 408 | return 0; |
74c9c0c1 | 409 | |
1da177e4 LT |
410 | /* Return: backtrack through the last |
411 | big jump. */ | |
412 | do { | |
6e23ae2a | 413 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
414 | oldpos = pos; |
415 | pos = e->counters.pcnt; | |
416 | e->counters.pcnt = 0; | |
417 | ||
418 | /* We're at the start. */ | |
419 | if (pos == oldpos) | |
420 | goto next; | |
421 | ||
68ad546a | 422 | e = entry0 + pos; |
1da177e4 LT |
423 | } while (oldpos == pos + e->next_offset); |
424 | ||
425 | /* Move along one */ | |
426 | size = e->next_offset; | |
68ad546a | 427 | e = entry0 + pos + size; |
f24e230d FW |
428 | if (pos + size >= newinfo->size) |
429 | return 0; | |
1da177e4 LT |
430 | e->counters.pcnt = pos; |
431 | pos += size; | |
432 | } else { | |
433 | int newpos = t->verdict; | |
434 | ||
435 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 436 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 437 | newpos >= 0) { |
1da177e4 | 438 | /* This a jump; chase it. */ |
f4dc7771 FW |
439 | if (!xt_find_jump_offset(offsets, newpos, |
440 | newinfo->number)) | |
441 | return 0; | |
68ad546a | 442 | e = entry0 + newpos; |
1da177e4 LT |
443 | } else { |
444 | /* ... this is a fallthru */ | |
445 | newpos = pos + e->next_offset; | |
f24e230d FW |
446 | if (newpos >= newinfo->size) |
447 | return 0; | |
1da177e4 | 448 | } |
68ad546a | 449 | e = entry0 + newpos; |
1da177e4 LT |
450 | e->counters.pcnt = pos; |
451 | pos = newpos; | |
452 | } | |
453 | } | |
d7cdf816 | 454 | next: ; |
1da177e4 LT |
455 | } |
456 | return 1; | |
457 | } | |
458 | ||
87a2e70d | 459 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 460 | { |
6be3d859 JE |
461 | struct xt_mtdtor_param par; |
462 | ||
f54e9367 | 463 | par.net = net; |
6be3d859 JE |
464 | par.match = m->u.kernel.match; |
465 | par.matchinfo = m->data; | |
916a917d | 466 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
467 | if (par.match->destroy != NULL) |
468 | par.match->destroy(&par); | |
469 | module_put(par.match->me); | |
1da177e4 LT |
470 | } |
471 | ||
022748a9 | 472 | static int |
87a2e70d | 473 | check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
a96be246 | 474 | { |
9b4fce7a | 475 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 | 476 | |
9b4fce7a JE |
477 | par->match = m->u.kernel.match; |
478 | par->matchinfo = m->data; | |
479 | ||
d7cdf816 PNA |
480 | return xt_check_match(par, m->u.match_size - sizeof(*m), |
481 | ip->proto, ip->invflags & IPT_INV_PROTO); | |
a96be246 DM |
482 | } |
483 | ||
022748a9 | 484 | static int |
87a2e70d | 485 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 486 | { |
6709dbbb | 487 | struct xt_match *match; |
3cdc7c95 | 488 | int ret; |
1da177e4 | 489 | |
fd0ec0e6 JE |
490 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
491 | m->u.user.revision); | |
d7cdf816 | 492 | if (IS_ERR(match)) |
fd0ec0e6 | 493 | return PTR_ERR(match); |
1da177e4 LT |
494 | m->u.kernel.match = match; |
495 | ||
6bdb331b | 496 | ret = check_match(m, par); |
3cdc7c95 PM |
497 | if (ret) |
498 | goto err; | |
499 | ||
1da177e4 | 500 | return 0; |
3cdc7c95 PM |
501 | err: |
502 | module_put(m->u.kernel.match->me); | |
503 | return ret; | |
1da177e4 LT |
504 | } |
505 | ||
add67461 | 506 | static int check_target(struct ipt_entry *e, struct net *net, const char *name) |
a96be246 | 507 | { |
87a2e70d | 508 | struct xt_entry_target *t = ipt_get_target(e); |
af5d6dc2 | 509 | struct xt_tgchk_param par = { |
add67461 | 510 | .net = net, |
af5d6dc2 JE |
511 | .table = name, |
512 | .entryinfo = e, | |
513 | .target = t->u.kernel.target, | |
514 | .targinfo = t->data, | |
515 | .hook_mask = e->comefrom, | |
916a917d | 516 | .family = NFPROTO_IPV4, |
af5d6dc2 | 517 | }; |
a96be246 | 518 | |
d7cdf816 PNA |
519 | return xt_check_target(&par, t->u.target_size - sizeof(*t), |
520 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); | |
a96be246 | 521 | } |
1da177e4 | 522 | |
022748a9 | 523 | static int |
a83d8e8d | 524 | find_check_entry(struct ipt_entry *e, struct net *net, const char *name, |
ae0ac0ed FW |
525 | unsigned int size, |
526 | struct xt_percpu_counter_alloc_state *alloc_state) | |
1da177e4 | 527 | { |
87a2e70d | 528 | struct xt_entry_target *t; |
6709dbbb | 529 | struct xt_target *target; |
1da177e4 LT |
530 | int ret; |
531 | unsigned int j; | |
9b4fce7a | 532 | struct xt_mtchk_param mtpar; |
dcea992a | 533 | struct xt_entry_match *ematch; |
1da177e4 | 534 | |
ae0ac0ed | 535 | if (!xt_percpu_counter_alloc(alloc_state, &e->counters)) |
71ae0dff FW |
536 | return -ENOMEM; |
537 | ||
1da177e4 | 538 | j = 0; |
a83d8e8d | 539 | mtpar.net = net; |
9b4fce7a JE |
540 | mtpar.table = name; |
541 | mtpar.entryinfo = &e->ip; | |
542 | mtpar.hook_mask = e->comefrom; | |
916a917d | 543 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 544 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 545 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 546 | if (ret != 0) |
6bdb331b JE |
547 | goto cleanup_matches; |
548 | ++j; | |
dcea992a | 549 | } |
1da177e4 LT |
550 | |
551 | t = ipt_get_target(e); | |
d2a7b6ba JE |
552 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
553 | t->u.user.revision); | |
554 | if (IS_ERR(target)) { | |
d2a7b6ba | 555 | ret = PTR_ERR(target); |
1da177e4 LT |
556 | goto cleanup_matches; |
557 | } | |
558 | t->u.kernel.target = target; | |
559 | ||
add67461 | 560 | ret = check_target(e, net, name); |
3cdc7c95 PM |
561 | if (ret) |
562 | goto err; | |
71ae0dff | 563 | |
1da177e4 | 564 | return 0; |
3cdc7c95 PM |
565 | err: |
566 | module_put(t->u.kernel.target->me); | |
1da177e4 | 567 | cleanup_matches: |
6bdb331b JE |
568 | xt_ematch_foreach(ematch, e) { |
569 | if (j-- == 0) | |
dcea992a | 570 | break; |
6bdb331b JE |
571 | cleanup_match(ematch, net); |
572 | } | |
71ae0dff | 573 | |
4d31eef5 | 574 | xt_percpu_counter_free(&e->counters); |
71ae0dff | 575 | |
1da177e4 LT |
576 | return ret; |
577 | } | |
578 | ||
d5d1baa1 | 579 | static bool check_underflow(const struct ipt_entry *e) |
e2fe35c1 | 580 | { |
87a2e70d | 581 | const struct xt_entry_target *t; |
e2fe35c1 JE |
582 | unsigned int verdict; |
583 | ||
54d83fc7 | 584 | if (!unconditional(e)) |
e2fe35c1 | 585 | return false; |
d5d1baa1 | 586 | t = ipt_get_target_c(e); |
e2fe35c1 JE |
587 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
588 | return false; | |
87a2e70d | 589 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
590 | verdict = -verdict - 1; |
591 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
592 | } | |
593 | ||
022748a9 | 594 | static int |
1da177e4 | 595 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 596 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
597 | const unsigned char *base, |
598 | const unsigned char *limit, | |
1da177e4 LT |
599 | const unsigned int *hook_entries, |
600 | const unsigned int *underflows, | |
0559518b | 601 | unsigned int valid_hooks) |
1da177e4 LT |
602 | { |
603 | unsigned int h; | |
bdf533de | 604 | int err; |
1da177e4 | 605 | |
3666ed1c | 606 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 || |
6e94e0cf | 607 | (unsigned char *)e + sizeof(struct ipt_entry) >= limit || |
d7cdf816 | 608 | (unsigned char *)e + e->next_offset > limit) |
1da177e4 | 609 | return -EINVAL; |
1da177e4 LT |
610 | |
611 | if (e->next_offset | |
d7cdf816 | 612 | < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target)) |
1da177e4 | 613 | return -EINVAL; |
1da177e4 | 614 | |
aa412ba2 FW |
615 | if (!ip_checkentry(&e->ip)) |
616 | return -EINVAL; | |
617 | ||
ce683e5f FW |
618 | err = xt_check_entry_offsets(e, e->elems, e->target_offset, |
619 | e->next_offset); | |
bdf533de FW |
620 | if (err) |
621 | return err; | |
622 | ||
1da177e4 | 623 | /* Check hooks & underflows */ |
6e23ae2a | 624 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
625 | if (!(valid_hooks & (1 << h))) |
626 | continue; | |
1da177e4 LT |
627 | if ((unsigned char *)e - base == hook_entries[h]) |
628 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 629 | if ((unsigned char *)e - base == underflows[h]) { |
d7cdf816 | 630 | if (!check_underflow(e)) |
90e7d4ab | 631 | return -EINVAL; |
d7cdf816 | 632 | |
1da177e4 | 633 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 634 | } |
1da177e4 LT |
635 | } |
636 | ||
1da177e4 | 637 | /* Clear counters and comefrom */ |
2e4e6a17 | 638 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 639 | e->comefrom = 0; |
1da177e4 LT |
640 | return 0; |
641 | } | |
642 | ||
0559518b JE |
643 | static void |
644 | cleanup_entry(struct ipt_entry *e, struct net *net) | |
1da177e4 | 645 | { |
a2df1648 | 646 | struct xt_tgdtor_param par; |
87a2e70d | 647 | struct xt_entry_target *t; |
dcea992a | 648 | struct xt_entry_match *ematch; |
1da177e4 | 649 | |
1da177e4 | 650 | /* Cleanup all matches */ |
dcea992a | 651 | xt_ematch_foreach(ematch, e) |
6bdb331b | 652 | cleanup_match(ematch, net); |
1da177e4 | 653 | t = ipt_get_target(e); |
a2df1648 | 654 | |
add67461 | 655 | par.net = net; |
a2df1648 JE |
656 | par.target = t->u.kernel.target; |
657 | par.targinfo = t->data; | |
916a917d | 658 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
659 | if (par.target->destroy != NULL) |
660 | par.target->destroy(&par); | |
661 | module_put(par.target->me); | |
4d31eef5 | 662 | xt_percpu_counter_free(&e->counters); |
1da177e4 LT |
663 | } |
664 | ||
665 | /* Checks and translates the user-supplied table segment (held in | |
666 | newinfo) */ | |
667 | static int | |
0f234214 | 668 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
6c28255b | 669 | const struct ipt_replace *repl) |
1da177e4 | 670 | { |
ae0ac0ed | 671 | struct xt_percpu_counter_alloc_state alloc_state = { 0 }; |
72b2b1dd | 672 | struct ipt_entry *iter; |
f4dc7771 | 673 | unsigned int *offsets; |
1da177e4 | 674 | unsigned int i; |
72b2b1dd | 675 | int ret = 0; |
1da177e4 | 676 | |
0f234214 JE |
677 | newinfo->size = repl->size; |
678 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
679 | |
680 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 681 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
682 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
683 | newinfo->underflow[i] = 0xFFFFFFFF; | |
684 | } | |
685 | ||
f4dc7771 FW |
686 | offsets = xt_alloc_entry_offsets(newinfo->number); |
687 | if (!offsets) | |
688 | return -ENOMEM; | |
1da177e4 LT |
689 | i = 0; |
690 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
691 | xt_entry_foreach(iter, entry0, newinfo->size) { |
692 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
693 | entry0 + repl->size, |
694 | repl->hook_entry, | |
695 | repl->underflow, | |
696 | repl->valid_hooks); | |
72b2b1dd | 697 | if (ret != 0) |
f4dc7771 FW |
698 | goto out_free; |
699 | if (i < repl->num_entries) | |
700 | offsets[i] = (void *)iter - entry0; | |
0559518b | 701 | ++i; |
98dbbfc3 FW |
702 | if (strcmp(ipt_get_target(iter)->u.user.name, |
703 | XT_ERROR_TARGET) == 0) | |
704 | ++newinfo->stacksize; | |
72b2b1dd | 705 | } |
1da177e4 | 706 | |
f4dc7771 | 707 | ret = -EINVAL; |
d7cdf816 | 708 | if (i != repl->num_entries) |
f4dc7771 | 709 | goto out_free; |
1da177e4 LT |
710 | |
711 | /* Check hooks all assigned */ | |
6e23ae2a | 712 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 713 | /* Only hooks which are valid */ |
0f234214 | 714 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 | 715 | continue; |
d7cdf816 | 716 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) |
f4dc7771 | 717 | goto out_free; |
d7cdf816 | 718 | if (newinfo->underflow[i] == 0xFFFFFFFF) |
f4dc7771 | 719 | goto out_free; |
1da177e4 LT |
720 | } |
721 | ||
f4dc7771 FW |
722 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) { |
723 | ret = -ELOOP; | |
724 | goto out_free; | |
725 | } | |
726 | kvfree(offsets); | |
74c9c0c1 | 727 | |
1da177e4 LT |
728 | /* Finally, each sanity check must pass */ |
729 | i = 0; | |
72b2b1dd | 730 | xt_entry_foreach(iter, entry0, newinfo->size) { |
ae0ac0ed FW |
731 | ret = find_check_entry(iter, net, repl->name, repl->size, |
732 | &alloc_state); | |
72b2b1dd JE |
733 | if (ret != 0) |
734 | break; | |
0559518b | 735 | ++i; |
72b2b1dd | 736 | } |
1da177e4 | 737 | |
74c9c0c1 | 738 | if (ret != 0) { |
0559518b JE |
739 | xt_entry_foreach(iter, entry0, newinfo->size) { |
740 | if (i-- == 0) | |
72b2b1dd | 741 | break; |
0559518b JE |
742 | cleanup_entry(iter, net); |
743 | } | |
74c9c0c1 DM |
744 | return ret; |
745 | } | |
1da177e4 | 746 | |
f4dc7771 FW |
747 | return ret; |
748 | out_free: | |
749 | kvfree(offsets); | |
1da177e4 LT |
750 | return ret; |
751 | } | |
752 | ||
1da177e4 | 753 | static void |
2e4e6a17 HW |
754 | get_counters(const struct xt_table_info *t, |
755 | struct xt_counters counters[]) | |
1da177e4 | 756 | { |
72b2b1dd | 757 | struct ipt_entry *iter; |
1da177e4 LT |
758 | unsigned int cpu; |
759 | unsigned int i; | |
760 | ||
6f912042 | 761 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 762 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 763 | |
1da177e4 | 764 | i = 0; |
482cfc31 | 765 | xt_entry_foreach(iter, t->entries, t->size) { |
71ae0dff | 766 | struct xt_counters *tmp; |
83723d60 ED |
767 | u64 bcnt, pcnt; |
768 | unsigned int start; | |
769 | ||
71ae0dff | 770 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
83723d60 | 771 | do { |
7f5c6d4f | 772 | start = read_seqcount_begin(s); |
71ae0dff FW |
773 | bcnt = tmp->bcnt; |
774 | pcnt = tmp->pcnt; | |
7f5c6d4f | 775 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
776 | |
777 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b | 778 | ++i; /* macro does multi eval of i */ |
a5d7a714 | 779 | cond_resched(); |
0559518b | 780 | } |
1da177e4 | 781 | } |
78454473 SH |
782 | } |
783 | ||
d13e7b2e FW |
784 | static void get_old_counters(const struct xt_table_info *t, |
785 | struct xt_counters counters[]) | |
786 | { | |
787 | struct ipt_entry *iter; | |
788 | unsigned int cpu, i; | |
789 | ||
790 | for_each_possible_cpu(cpu) { | |
791 | i = 0; | |
792 | xt_entry_foreach(iter, t->entries, t->size) { | |
793 | const struct xt_counters *tmp; | |
794 | ||
795 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); | |
796 | ADD_COUNTER(counters[i], tmp->bcnt, tmp->pcnt); | |
797 | ++i; /* macro does multi eval of i */ | |
798 | } | |
799 | ||
800 | cond_resched(); | |
801 | } | |
802 | } | |
803 | ||
d5d1baa1 | 804 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 805 | { |
2722971c | 806 | unsigned int countersize; |
2e4e6a17 | 807 | struct xt_counters *counters; |
d5d1baa1 | 808 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
809 | |
810 | /* We need atomic snapshot of counters: rest doesn't change | |
811 | (other than comefrom, which userspace doesn't care | |
812 | about). */ | |
2e4e6a17 | 813 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 814 | counters = vzalloc(countersize); |
1da177e4 LT |
815 | |
816 | if (counters == NULL) | |
942e4a2b | 817 | return ERR_PTR(-ENOMEM); |
78454473 | 818 | |
942e4a2b | 819 | get_counters(private, counters); |
1da177e4 | 820 | |
2722971c DM |
821 | return counters; |
822 | } | |
823 | ||
824 | static int | |
825 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 826 | const struct xt_table *table, |
2722971c DM |
827 | void __user *userptr) |
828 | { | |
829 | unsigned int off, num; | |
d5d1baa1 | 830 | const struct ipt_entry *e; |
2722971c | 831 | struct xt_counters *counters; |
5452e425 | 832 | const struct xt_table_info *private = table->private; |
2722971c | 833 | int ret = 0; |
711bdde6 | 834 | const void *loc_cpu_entry; |
2722971c DM |
835 | |
836 | counters = alloc_counters(table); | |
837 | if (IS_ERR(counters)) | |
838 | return PTR_ERR(counters); | |
839 | ||
482cfc31 | 840 | loc_cpu_entry = private->entries; |
1da177e4 LT |
841 | |
842 | /* FIXME: use iterator macros --RR */ | |
843 | /* ... then go back and fix counters and names */ | |
844 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
845 | unsigned int i; | |
87a2e70d JE |
846 | const struct xt_entry_match *m; |
847 | const struct xt_entry_target *t; | |
1da177e4 | 848 | |
68ad546a | 849 | e = loc_cpu_entry + off; |
f77bc5b2 WB |
850 | if (copy_to_user(userptr + off, e, sizeof(*e))) { |
851 | ret = -EFAULT; | |
852 | goto free_counters; | |
853 | } | |
1da177e4 LT |
854 | if (copy_to_user(userptr + off |
855 | + offsetof(struct ipt_entry, counters), | |
856 | &counters[num], | |
857 | sizeof(counters[num])) != 0) { | |
858 | ret = -EFAULT; | |
859 | goto free_counters; | |
860 | } | |
861 | ||
862 | for (i = sizeof(struct ipt_entry); | |
863 | i < e->target_offset; | |
864 | i += m->u.match_size) { | |
865 | m = (void *)e + i; | |
866 | ||
f77bc5b2 | 867 | if (xt_match_to_user(m, userptr + off + i)) { |
1da177e4 LT |
868 | ret = -EFAULT; |
869 | goto free_counters; | |
870 | } | |
871 | } | |
872 | ||
d5d1baa1 | 873 | t = ipt_get_target_c(e); |
f77bc5b2 | 874 | if (xt_target_to_user(t, userptr + off + e->target_offset)) { |
1da177e4 LT |
875 | ret = -EFAULT; |
876 | goto free_counters; | |
877 | } | |
878 | } | |
879 | ||
880 | free_counters: | |
881 | vfree(counters); | |
882 | return ret; | |
883 | } | |
884 | ||
2722971c | 885 | #ifdef CONFIG_COMPAT |
739674fb | 886 | static void compat_standard_from_user(void *dst, const void *src) |
2722971c | 887 | { |
9fa492cd | 888 | int v = *(compat_int_t *)src; |
2722971c | 889 | |
9fa492cd | 890 | if (v > 0) |
b386d9f5 | 891 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
892 | memcpy(dst, &v, sizeof(v)); |
893 | } | |
46c5ea3c | 894 | |
739674fb | 895 | static int compat_standard_to_user(void __user *dst, const void *src) |
2722971c | 896 | { |
9fa492cd | 897 | compat_int_t cv = *(int *)src; |
2722971c | 898 | |
9fa492cd | 899 | if (cv > 0) |
b386d9f5 | 900 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 901 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
902 | } |
903 | ||
d5d1baa1 | 904 | static int compat_calc_entry(const struct ipt_entry *e, |
4b478248 | 905 | const struct xt_table_info *info, |
d5d1baa1 | 906 | const void *base, struct xt_table_info *newinfo) |
2722971c | 907 | { |
dcea992a | 908 | const struct xt_entry_match *ematch; |
87a2e70d | 909 | const struct xt_entry_target *t; |
e5b5ef7d | 910 | unsigned int entry_offset; |
2722971c DM |
911 | int off, i, ret; |
912 | ||
30c08c41 | 913 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c | 914 | entry_offset = (void *)e - base; |
dcea992a | 915 | xt_ematch_foreach(ematch, e) |
6bdb331b | 916 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 917 | t = ipt_get_target_c(e); |
9fa492cd | 918 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 919 | newinfo->size -= off; |
b386d9f5 | 920 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
921 | if (ret) |
922 | return ret; | |
923 | ||
6e23ae2a | 924 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
925 | if (info->hook_entry[i] && |
926 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 927 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
928 | if (info->underflow[i] && |
929 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
930 | newinfo->underflow[i] -= off; |
931 | } | |
932 | return 0; | |
933 | } | |
934 | ||
259d4e41 | 935 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 936 | struct xt_table_info *newinfo) |
2722971c | 937 | { |
72b2b1dd | 938 | struct ipt_entry *iter; |
711bdde6 | 939 | const void *loc_cpu_entry; |
0559518b | 940 | int ret; |
2722971c DM |
941 | |
942 | if (!newinfo || !info) | |
943 | return -EINVAL; | |
944 | ||
482cfc31 | 945 | /* we dont care about newinfo->entries */ |
259d4e41 ED |
946 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
947 | newinfo->initial_entries = 0; | |
482cfc31 | 948 | loc_cpu_entry = info->entries; |
255d0dc3 | 949 | xt_compat_init_offsets(AF_INET, info->number); |
72b2b1dd JE |
950 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
951 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
952 | if (ret != 0) | |
0559518b | 953 | return ret; |
72b2b1dd | 954 | } |
0559518b | 955 | return 0; |
2722971c DM |
956 | } |
957 | #endif | |
958 | ||
d5d1baa1 | 959 | static int get_info(struct net *net, void __user *user, |
6c28255b | 960 | const int *len, int compat) |
2722971c | 961 | { |
12b00c2c | 962 | char name[XT_TABLE_MAXNAMELEN]; |
e60a13e0 | 963 | struct xt_table *t; |
2722971c DM |
964 | int ret; |
965 | ||
d7cdf816 | 966 | if (*len != sizeof(struct ipt_getinfo)) |
2722971c | 967 | return -EINVAL; |
2722971c DM |
968 | |
969 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
970 | return -EFAULT; | |
971 | ||
12b00c2c | 972 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
2722971c DM |
973 | #ifdef CONFIG_COMPAT |
974 | if (compat) | |
975 | xt_compat_lock(AF_INET); | |
976 | #endif | |
34bd137b | 977 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 978 | "iptable_%s", name); |
eb1a6bdc | 979 | if (t) { |
2722971c | 980 | struct ipt_getinfo info; |
5452e425 | 981 | const struct xt_table_info *private = t->private; |
2722971c | 982 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
983 | struct xt_table_info tmp; |
984 | ||
2722971c | 985 | if (compat) { |
2722971c | 986 | ret = compat_table_info(private, &tmp); |
b386d9f5 | 987 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 988 | private = &tmp; |
2722971c DM |
989 | } |
990 | #endif | |
b5f15ac4 | 991 | memset(&info, 0, sizeof(info)); |
2722971c DM |
992 | info.valid_hooks = t->valid_hooks; |
993 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 994 | sizeof(info.hook_entry)); |
2722971c | 995 | memcpy(info.underflow, private->underflow, |
4b478248 | 996 | sizeof(info.underflow)); |
2722971c DM |
997 | info.num_entries = private->number; |
998 | info.size = private->size; | |
999 | strcpy(info.name, name); | |
1000 | ||
1001 | if (copy_to_user(user, &info, *len) != 0) | |
1002 | ret = -EFAULT; | |
1003 | else | |
1004 | ret = 0; | |
1005 | ||
1006 | xt_table_unlock(t); | |
1007 | module_put(t->me); | |
1008 | } else | |
eb1a6bdc | 1009 | ret = -ENOENT; |
2722971c DM |
1010 | #ifdef CONFIG_COMPAT |
1011 | if (compat) | |
1012 | xt_compat_unlock(AF_INET); | |
1013 | #endif | |
1014 | return ret; | |
1015 | } | |
1016 | ||
1017 | static int | |
d5d1baa1 JE |
1018 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
1019 | const int *len) | |
2722971c DM |
1020 | { |
1021 | int ret; | |
1022 | struct ipt_get_entries get; | |
e60a13e0 | 1023 | struct xt_table *t; |
2722971c | 1024 | |
d7cdf816 | 1025 | if (*len < sizeof(get)) |
2722971c | 1026 | return -EINVAL; |
2722971c DM |
1027 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1028 | return -EFAULT; | |
d7cdf816 | 1029 | if (*len != sizeof(struct ipt_get_entries) + get.size) |
2722971c | 1030 | return -EINVAL; |
b301f253 | 1031 | get.name[sizeof(get.name) - 1] = '\0'; |
2722971c | 1032 | |
34bd137b | 1033 | t = xt_find_table_lock(net, AF_INET, get.name); |
eb1a6bdc | 1034 | if (t) { |
5452e425 | 1035 | const struct xt_table_info *private = t->private; |
2722971c DM |
1036 | if (get.size == private->size) |
1037 | ret = copy_entries_to_user(private->size, | |
1038 | t, uptr->entrytable); | |
d7cdf816 | 1039 | else |
544473c1 | 1040 | ret = -EAGAIN; |
d7cdf816 | 1041 | |
2722971c DM |
1042 | module_put(t->me); |
1043 | xt_table_unlock(t); | |
1044 | } else | |
eb1a6bdc | 1045 | ret = -ENOENT; |
2722971c DM |
1046 | |
1047 | return ret; | |
1048 | } | |
1049 | ||
1050 | static int | |
34bd137b | 1051 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1052 | struct xt_table_info *newinfo, unsigned int num_counters, |
1053 | void __user *counters_ptr) | |
2722971c DM |
1054 | { |
1055 | int ret; | |
e60a13e0 | 1056 | struct xt_table *t; |
2722971c DM |
1057 | struct xt_table_info *oldinfo; |
1058 | struct xt_counters *counters; | |
72b2b1dd | 1059 | struct ipt_entry *iter; |
2722971c DM |
1060 | |
1061 | ret = 0; | |
83723d60 | 1062 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
2722971c DM |
1063 | if (!counters) { |
1064 | ret = -ENOMEM; | |
1065 | goto out; | |
1066 | } | |
1067 | ||
34bd137b | 1068 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c | 1069 | "iptable_%s", name); |
eb1a6bdc JL |
1070 | if (!t) { |
1071 | ret = -ENOENT; | |
2722971c DM |
1072 | goto free_newinfo_counters_untrans; |
1073 | } | |
1074 | ||
1075 | /* You lied! */ | |
1076 | if (valid_hooks != t->valid_hooks) { | |
2722971c DM |
1077 | ret = -EINVAL; |
1078 | goto put_module; | |
1079 | } | |
1080 | ||
1081 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1082 | if (!oldinfo) | |
1083 | goto put_module; | |
1084 | ||
1085 | /* Update module usage count based on number of rules */ | |
2722971c DM |
1086 | if ((oldinfo->number > oldinfo->initial_entries) || |
1087 | (newinfo->number <= oldinfo->initial_entries)) | |
1088 | module_put(t->me); | |
1089 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1090 | (newinfo->number <= oldinfo->initial_entries)) | |
1091 | module_put(t->me); | |
1092 | ||
d13e7b2e | 1093 | get_old_counters(oldinfo, counters); |
942e4a2b | 1094 | |
2722971c | 1095 | /* Decrease module usage counts and free resource */ |
482cfc31 | 1096 | xt_entry_foreach(iter, oldinfo->entries, oldinfo->size) |
0559518b | 1097 | cleanup_entry(iter, net); |
72b2b1dd | 1098 | |
2722971c DM |
1099 | xt_free_table_info(oldinfo); |
1100 | if (copy_to_user(counters_ptr, counters, | |
c58dd2dd TG |
1101 | sizeof(struct xt_counters) * num_counters) != 0) { |
1102 | /* Silent error, can't fail, new table is already in place */ | |
1103 | net_warn_ratelimited("iptables: counters copy to user failed while replacing table\n"); | |
1104 | } | |
2722971c DM |
1105 | vfree(counters); |
1106 | xt_table_unlock(t); | |
1107 | return ret; | |
1108 | ||
1109 | put_module: | |
1110 | module_put(t->me); | |
1111 | xt_table_unlock(t); | |
1112 | free_newinfo_counters_untrans: | |
1113 | vfree(counters); | |
1114 | out: | |
1115 | return ret; | |
1116 | } | |
1117 | ||
1118 | static int | |
d5d1baa1 | 1119 | do_replace(struct net *net, const void __user *user, unsigned int len) |
2722971c DM |
1120 | { |
1121 | int ret; | |
1122 | struct ipt_replace tmp; | |
1123 | struct xt_table_info *newinfo; | |
1124 | void *loc_cpu_entry; | |
72b2b1dd | 1125 | struct ipt_entry *iter; |
2722971c DM |
1126 | |
1127 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1128 | return -EFAULT; | |
1129 | ||
2722971c | 1130 | /* overflow check */ |
2722971c DM |
1131 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1132 | return -ENOMEM; | |
1086bbe9 DJ |
1133 | if (tmp.num_counters == 0) |
1134 | return -EINVAL; | |
1135 | ||
78b79876 | 1136 | tmp.name[sizeof(tmp.name)-1] = 0; |
2722971c DM |
1137 | |
1138 | newinfo = xt_alloc_table_info(tmp.size); | |
1139 | if (!newinfo) | |
1140 | return -ENOMEM; | |
1141 | ||
482cfc31 | 1142 | loc_cpu_entry = newinfo->entries; |
2722971c DM |
1143 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1144 | tmp.size) != 0) { | |
1145 | ret = -EFAULT; | |
1146 | goto free_newinfo; | |
1147 | } | |
1148 | ||
0f234214 | 1149 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
2722971c DM |
1150 | if (ret != 0) |
1151 | goto free_newinfo; | |
1152 | ||
34bd137b | 1153 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1154 | tmp.num_counters, tmp.counters); |
2722971c DM |
1155 | if (ret) |
1156 | goto free_newinfo_untrans; | |
1157 | return 0; | |
1158 | ||
1159 | free_newinfo_untrans: | |
72b2b1dd | 1160 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1161 | cleanup_entry(iter, net); |
2722971c DM |
1162 | free_newinfo: |
1163 | xt_free_table_info(newinfo); | |
1164 | return ret; | |
1165 | } | |
1166 | ||
2722971c | 1167 | static int |
d5d1baa1 | 1168 | do_add_counters(struct net *net, const void __user *user, |
6c28255b | 1169 | unsigned int len, int compat) |
2722971c | 1170 | { |
482cfc31 | 1171 | unsigned int i; |
2722971c DM |
1172 | struct xt_counters_info tmp; |
1173 | struct xt_counters *paddc; | |
e60a13e0 | 1174 | struct xt_table *t; |
5452e425 | 1175 | const struct xt_table_info *private; |
2722971c | 1176 | int ret = 0; |
72b2b1dd | 1177 | struct ipt_entry *iter; |
7f5c6d4f | 1178 | unsigned int addend; |
2722971c | 1179 | |
d7591f0c FW |
1180 | paddc = xt_copy_counters_from_user(user, len, &tmp, compat); |
1181 | if (IS_ERR(paddc)) | |
1182 | return PTR_ERR(paddc); | |
2722971c | 1183 | |
d7591f0c | 1184 | t = xt_find_table_lock(net, AF_INET, tmp.name); |
eb1a6bdc JL |
1185 | if (!t) { |
1186 | ret = -ENOENT; | |
2722971c DM |
1187 | goto free; |
1188 | } | |
1189 | ||
942e4a2b | 1190 | local_bh_disable(); |
2722971c | 1191 | private = t->private; |
d7591f0c | 1192 | if (private->number != tmp.num_counters) { |
2722971c DM |
1193 | ret = -EINVAL; |
1194 | goto unlock_up_free; | |
1195 | } | |
1196 | ||
1197 | i = 0; | |
7f5c6d4f | 1198 | addend = xt_write_recseq_begin(); |
482cfc31 | 1199 | xt_entry_foreach(iter, private->entries, private->size) { |
71ae0dff FW |
1200 | struct xt_counters *tmp; |
1201 | ||
1202 | tmp = xt_get_this_cpu_counter(&iter->counters); | |
1203 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); | |
0559518b JE |
1204 | ++i; |
1205 | } | |
7f5c6d4f | 1206 | xt_write_recseq_end(addend); |
2722971c | 1207 | unlock_up_free: |
942e4a2b | 1208 | local_bh_enable(); |
2722971c DM |
1209 | xt_table_unlock(t); |
1210 | module_put(t->me); | |
1211 | free: | |
1212 | vfree(paddc); | |
1213 | ||
1214 | return ret; | |
1215 | } | |
1216 | ||
1217 | #ifdef CONFIG_COMPAT | |
1218 | struct compat_ipt_replace { | |
12b00c2c | 1219 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1220 | u32 valid_hooks; |
1221 | u32 num_entries; | |
1222 | u32 size; | |
6e23ae2a PM |
1223 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1224 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c | 1225 | u32 num_counters; |
87a2e70d | 1226 | compat_uptr_t counters; /* struct xt_counters * */ |
2722971c DM |
1227 | struct compat_ipt_entry entries[0]; |
1228 | }; | |
1229 | ||
a18aa31b PM |
1230 | static int |
1231 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1232 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1233 | unsigned int i) |
2722971c | 1234 | { |
87a2e70d | 1235 | struct xt_entry_target *t; |
2722971c DM |
1236 | struct compat_ipt_entry __user *ce; |
1237 | u_int16_t target_offset, next_offset; | |
1238 | compat_uint_t origsize; | |
dcea992a JE |
1239 | const struct xt_entry_match *ematch; |
1240 | int ret = 0; | |
2722971c | 1241 | |
2722971c | 1242 | origsize = *size; |
68ad546a | 1243 | ce = *dstptr; |
0559518b JE |
1244 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
1245 | copy_to_user(&ce->counters, &counters[i], | |
1246 | sizeof(counters[i])) != 0) | |
1247 | return -EFAULT; | |
a18aa31b | 1248 | |
2722971c | 1249 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1250 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1251 | ||
dcea992a JE |
1252 | xt_ematch_foreach(ematch, e) { |
1253 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1254 | if (ret != 0) | |
6bdb331b | 1255 | return ret; |
dcea992a | 1256 | } |
2722971c | 1257 | target_offset = e->target_offset - (origsize - *size); |
2722971c | 1258 | t = ipt_get_target(e); |
9fa492cd | 1259 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c | 1260 | if (ret) |
0559518b | 1261 | return ret; |
2722971c | 1262 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1263 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1264 | put_user(next_offset, &ce->next_offset) != 0) | |
1265 | return -EFAULT; | |
2722971c | 1266 | return 0; |
2722971c DM |
1267 | } |
1268 | ||
022748a9 | 1269 | static int |
87a2e70d | 1270 | compat_find_calc_match(struct xt_entry_match *m, |
4b478248 | 1271 | const struct ipt_ip *ip, |
6bdb331b | 1272 | int *size) |
2722971c | 1273 | { |
6709dbbb | 1274 | struct xt_match *match; |
2722971c | 1275 | |
fd0ec0e6 JE |
1276 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
1277 | m->u.user.revision); | |
d7cdf816 | 1278 | if (IS_ERR(match)) |
fd0ec0e6 | 1279 | return PTR_ERR(match); |
d7cdf816 | 1280 | |
2722971c | 1281 | m->u.kernel.match = match; |
9fa492cd | 1282 | *size += xt_compat_match_offset(match); |
4c1b52bc DM |
1283 | return 0; |
1284 | } | |
1285 | ||
0559518b | 1286 | static void compat_release_entry(struct compat_ipt_entry *e) |
4c1b52bc | 1287 | { |
87a2e70d | 1288 | struct xt_entry_target *t; |
dcea992a | 1289 | struct xt_entry_match *ematch; |
4c1b52bc | 1290 | |
4c1b52bc | 1291 | /* Cleanup all matches */ |
dcea992a | 1292 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1293 | module_put(ematch->u.kernel.match->me); |
73cd598d | 1294 | t = compat_ipt_get_target(e); |
4c1b52bc | 1295 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1296 | } |
1297 | ||
022748a9 | 1298 | static int |
73cd598d | 1299 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1300 | struct xt_table_info *newinfo, |
1301 | unsigned int *size, | |
d5d1baa1 | 1302 | const unsigned char *base, |
09d96860 | 1303 | const unsigned char *limit) |
2722971c | 1304 | { |
dcea992a | 1305 | struct xt_entry_match *ematch; |
87a2e70d | 1306 | struct xt_entry_target *t; |
6709dbbb | 1307 | struct xt_target *target; |
e5b5ef7d | 1308 | unsigned int entry_offset; |
b0a6363c | 1309 | unsigned int j; |
09d96860 | 1310 | int ret, off; |
2722971c | 1311 | |
3666ed1c | 1312 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
6e94e0cf | 1313 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit || |
d7cdf816 | 1314 | (unsigned char *)e + e->next_offset > limit) |
2722971c | 1315 | return -EINVAL; |
2722971c DM |
1316 | |
1317 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
d7cdf816 | 1318 | sizeof(struct compat_xt_entry_target)) |
2722971c | 1319 | return -EINVAL; |
2722971c | 1320 | |
aa412ba2 FW |
1321 | if (!ip_checkentry(&e->ip)) |
1322 | return -EINVAL; | |
1323 | ||
ce683e5f | 1324 | ret = xt_compat_check_entry_offsets(e, e->elems, |
fc1221b3 | 1325 | e->target_offset, e->next_offset); |
a96be246 DM |
1326 | if (ret) |
1327 | return ret; | |
590bdf7f | 1328 | |
30c08c41 | 1329 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1330 | entry_offset = (void *)e - (void *)base; |
1331 | j = 0; | |
dcea992a | 1332 | xt_ematch_foreach(ematch, e) { |
7d3f843e | 1333 | ret = compat_find_calc_match(ematch, &e->ip, &off); |
dcea992a | 1334 | if (ret != 0) |
6bdb331b JE |
1335 | goto release_matches; |
1336 | ++j; | |
dcea992a | 1337 | } |
2722971c | 1338 | |
73cd598d | 1339 | t = compat_ipt_get_target(e); |
d2a7b6ba JE |
1340 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
1341 | t->u.user.revision); | |
1342 | if (IS_ERR(target)) { | |
d2a7b6ba | 1343 | ret = PTR_ERR(target); |
4c1b52bc | 1344 | goto release_matches; |
2722971c DM |
1345 | } |
1346 | t->u.kernel.target = target; | |
1347 | ||
9fa492cd | 1348 | off += xt_compat_target_offset(target); |
2722971c | 1349 | *size += off; |
b386d9f5 | 1350 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1351 | if (ret) |
1352 | goto out; | |
1353 | ||
2722971c | 1354 | return 0; |
bec71b16 | 1355 | |
2722971c | 1356 | out: |
bec71b16 | 1357 | module_put(t->u.kernel.target->me); |
4c1b52bc | 1358 | release_matches: |
6bdb331b JE |
1359 | xt_ematch_foreach(ematch, e) { |
1360 | if (j-- == 0) | |
dcea992a | 1361 | break; |
6bdb331b JE |
1362 | module_put(ematch->u.kernel.match->me); |
1363 | } | |
2722971c DM |
1364 | return ret; |
1365 | } | |
1366 | ||
0188346f | 1367 | static void |
73cd598d | 1368 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
7d3f843e | 1369 | unsigned int *size, |
4b478248 | 1370 | struct xt_table_info *newinfo, unsigned char *base) |
2722971c | 1371 | { |
87a2e70d | 1372 | struct xt_entry_target *t; |
2722971c DM |
1373 | struct ipt_entry *de; |
1374 | unsigned int origsize; | |
0188346f | 1375 | int h; |
dcea992a | 1376 | struct xt_entry_match *ematch; |
2722971c | 1377 | |
2722971c | 1378 | origsize = *size; |
68ad546a | 1379 | de = *dstptr; |
2722971c | 1380 | memcpy(de, e, sizeof(struct ipt_entry)); |
73cd598d | 1381 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1382 | |
73cd598d | 1383 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1384 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1385 | ||
0188346f FW |
1386 | xt_ematch_foreach(ematch, e) |
1387 | xt_compat_match_from_user(ematch, dstptr, size); | |
1388 | ||
2722971c | 1389 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1390 | t = compat_ipt_get_target(e); |
9fa492cd | 1391 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1392 | |
1393 | de->next_offset = e->next_offset - (origsize - *size); | |
09d96860 | 1394 | |
6e23ae2a | 1395 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1396 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1397 | newinfo->hook_entry[h] -= origsize - *size; | |
1398 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1399 | newinfo->underflow[h] -= origsize - *size; | |
1400 | } | |
f6677f43 DM |
1401 | } |
1402 | ||
1da177e4 | 1403 | static int |
a83d8e8d | 1404 | translate_compat_table(struct net *net, |
4b478248 PM |
1405 | struct xt_table_info **pinfo, |
1406 | void **pentry0, | |
7d3f843e | 1407 | const struct compat_ipt_replace *compatr) |
1da177e4 | 1408 | { |
920b868a | 1409 | unsigned int i, j; |
2722971c DM |
1410 | struct xt_table_info *newinfo, *info; |
1411 | void *pos, *entry0, *entry1; | |
72b2b1dd | 1412 | struct compat_ipt_entry *iter0; |
09d96860 | 1413 | struct ipt_replace repl; |
2722971c | 1414 | unsigned int size; |
0559518b | 1415 | int ret; |
1da177e4 | 1416 | |
2722971c DM |
1417 | info = *pinfo; |
1418 | entry0 = *pentry0; | |
7d3f843e FW |
1419 | size = compatr->size; |
1420 | info->number = compatr->num_entries; | |
2722971c | 1421 | |
920b868a | 1422 | j = 0; |
2722971c | 1423 | xt_compat_lock(AF_INET); |
7d3f843e | 1424 | xt_compat_init_offsets(AF_INET, compatr->num_entries); |
2722971c | 1425 | /* Walk through entries, checking offsets. */ |
7d3f843e | 1426 | xt_entry_foreach(iter0, entry0, compatr->size) { |
72b2b1dd | 1427 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
6b4ff2d7 | 1428 | entry0, |
09d96860 | 1429 | entry0 + compatr->size); |
72b2b1dd | 1430 | if (ret != 0) |
0559518b JE |
1431 | goto out_unlock; |
1432 | ++j; | |
72b2b1dd | 1433 | } |
2722971c DM |
1434 | |
1435 | ret = -EINVAL; | |
d7cdf816 | 1436 | if (j != compatr->num_entries) |
2722971c | 1437 | goto out_unlock; |
2722971c | 1438 | |
2722971c DM |
1439 | ret = -ENOMEM; |
1440 | newinfo = xt_alloc_table_info(size); | |
1441 | if (!newinfo) | |
1442 | goto out_unlock; | |
1443 | ||
7d3f843e | 1444 | newinfo->number = compatr->num_entries; |
6e23ae2a | 1445 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
09d96860 FW |
1446 | newinfo->hook_entry[i] = compatr->hook_entry[i]; |
1447 | newinfo->underflow[i] = compatr->underflow[i]; | |
2722971c | 1448 | } |
482cfc31 | 1449 | entry1 = newinfo->entries; |
2722971c | 1450 | pos = entry1; |
7d3f843e | 1451 | size = compatr->size; |
0188346f FW |
1452 | xt_entry_foreach(iter0, entry0, compatr->size) |
1453 | compat_copy_entry_from_user(iter0, &pos, &size, | |
1454 | newinfo, entry1); | |
1455 | ||
09d96860 FW |
1456 | /* all module references in entry0 are now gone. |
1457 | * entry1/newinfo contains a 64bit ruleset that looks exactly as | |
1458 | * generated by 64bit userspace. | |
1459 | * | |
1460 | * Call standard translate_table() to validate all hook_entrys, | |
1461 | * underflows, check for loops, etc. | |
1462 | */ | |
b386d9f5 | 1463 | xt_compat_flush_offsets(AF_INET); |
2722971c | 1464 | xt_compat_unlock(AF_INET); |
2722971c | 1465 | |
09d96860 | 1466 | memcpy(&repl, compatr, sizeof(*compatr)); |
2722971c | 1467 | |
09d96860 FW |
1468 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1469 | repl.hook_entry[i] = newinfo->hook_entry[i]; | |
1470 | repl.underflow[i] = newinfo->underflow[i]; | |
4c1b52bc | 1471 | } |
f6677f43 | 1472 | |
09d96860 FW |
1473 | repl.num_counters = 0; |
1474 | repl.counters = NULL; | |
1475 | repl.size = newinfo->size; | |
1476 | ret = translate_table(net, newinfo, entry1, &repl); | |
1477 | if (ret) | |
1478 | goto free_newinfo; | |
1479 | ||
2722971c DM |
1480 | *pinfo = newinfo; |
1481 | *pentry0 = entry1; | |
1482 | xt_free_table_info(info); | |
1483 | return 0; | |
1da177e4 | 1484 | |
2722971c DM |
1485 | free_newinfo: |
1486 | xt_free_table_info(newinfo); | |
09d96860 FW |
1487 | return ret; |
1488 | out_unlock: | |
1489 | xt_compat_flush_offsets(AF_INET); | |
1490 | xt_compat_unlock(AF_INET); | |
7d3f843e | 1491 | xt_entry_foreach(iter0, entry0, compatr->size) { |
0559518b | 1492 | if (j-- == 0) |
72b2b1dd | 1493 | break; |
0559518b JE |
1494 | compat_release_entry(iter0); |
1495 | } | |
1da177e4 LT |
1496 | return ret; |
1497 | } | |
1498 | ||
1499 | static int | |
34bd137b | 1500 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1501 | { |
1502 | int ret; | |
2722971c DM |
1503 | struct compat_ipt_replace tmp; |
1504 | struct xt_table_info *newinfo; | |
1505 | void *loc_cpu_entry; | |
72b2b1dd | 1506 | struct ipt_entry *iter; |
1da177e4 LT |
1507 | |
1508 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1509 | return -EFAULT; | |
1510 | ||
ee4bb818 | 1511 | /* overflow check */ |
ee4bb818 KK |
1512 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1513 | return -ENOMEM; | |
1086bbe9 DJ |
1514 | if (tmp.num_counters == 0) |
1515 | return -EINVAL; | |
1516 | ||
78b79876 | 1517 | tmp.name[sizeof(tmp.name)-1] = 0; |
ee4bb818 | 1518 | |
2e4e6a17 | 1519 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1520 | if (!newinfo) |
1521 | return -ENOMEM; | |
1522 | ||
482cfc31 | 1523 | loc_cpu_entry = newinfo->entries; |
31836064 | 1524 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1da177e4 LT |
1525 | tmp.size) != 0) { |
1526 | ret = -EFAULT; | |
1527 | goto free_newinfo; | |
1528 | } | |
1529 | ||
7d3f843e | 1530 | ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp); |
2722971c | 1531 | if (ret != 0) |
1da177e4 | 1532 | goto free_newinfo; |
1da177e4 | 1533 | |
34bd137b | 1534 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1535 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1536 | if (ret) |
1537 | goto free_newinfo_untrans; | |
1538 | return 0; | |
1da177e4 | 1539 | |
2722971c | 1540 | free_newinfo_untrans: |
72b2b1dd | 1541 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1542 | cleanup_entry(iter, net); |
2722971c DM |
1543 | free_newinfo: |
1544 | xt_free_table_info(newinfo); | |
1545 | return ret; | |
1546 | } | |
1da177e4 | 1547 | |
2722971c DM |
1548 | static int |
1549 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1550 | unsigned int len) |
2722971c DM |
1551 | { |
1552 | int ret; | |
1da177e4 | 1553 | |
52e804c6 | 1554 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
2722971c | 1555 | return -EPERM; |
1da177e4 | 1556 | |
2722971c DM |
1557 | switch (cmd) { |
1558 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1559 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1560 | break; |
1da177e4 | 1561 | |
2722971c | 1562 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1563 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1564 | break; |
1565 | ||
1566 | default: | |
2722971c DM |
1567 | ret = -EINVAL; |
1568 | } | |
1da177e4 | 1569 | |
1da177e4 LT |
1570 | return ret; |
1571 | } | |
1572 | ||
4b478248 | 1573 | struct compat_ipt_get_entries { |
12b00c2c | 1574 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1575 | compat_uint_t size; |
1576 | struct compat_ipt_entry entrytable[0]; | |
1577 | }; | |
1da177e4 | 1578 | |
4b478248 PM |
1579 | static int |
1580 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1581 | void __user *userptr) | |
2722971c | 1582 | { |
2722971c | 1583 | struct xt_counters *counters; |
5452e425 | 1584 | const struct xt_table_info *private = table->private; |
2722971c DM |
1585 | void __user *pos; |
1586 | unsigned int size; | |
1587 | int ret = 0; | |
a18aa31b | 1588 | unsigned int i = 0; |
72b2b1dd | 1589 | struct ipt_entry *iter; |
1da177e4 | 1590 | |
2722971c DM |
1591 | counters = alloc_counters(table); |
1592 | if (IS_ERR(counters)) | |
1593 | return PTR_ERR(counters); | |
1594 | ||
2722971c DM |
1595 | pos = userptr; |
1596 | size = total_size; | |
482cfc31 | 1597 | xt_entry_foreach(iter, private->entries, total_size) { |
72b2b1dd | 1598 | ret = compat_copy_entry_to_user(iter, &pos, |
6b4ff2d7 | 1599 | &size, counters, i++); |
72b2b1dd JE |
1600 | if (ret != 0) |
1601 | break; | |
1602 | } | |
2722971c | 1603 | |
2722971c DM |
1604 | vfree(counters); |
1605 | return ret; | |
1da177e4 LT |
1606 | } |
1607 | ||
1608 | static int | |
34bd137b AD |
1609 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1610 | int *len) | |
1da177e4 | 1611 | { |
2722971c DM |
1612 | int ret; |
1613 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1614 | struct xt_table *t; |
1da177e4 | 1615 | |
d7cdf816 | 1616 | if (*len < sizeof(get)) |
1da177e4 LT |
1617 | return -EINVAL; |
1618 | ||
2722971c DM |
1619 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1620 | return -EFAULT; | |
1da177e4 | 1621 | |
d7cdf816 | 1622 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) |
2722971c | 1623 | return -EINVAL; |
d7cdf816 | 1624 | |
b301f253 | 1625 | get.name[sizeof(get.name) - 1] = '\0'; |
1da177e4 | 1626 | |
2722971c | 1627 | xt_compat_lock(AF_INET); |
34bd137b | 1628 | t = xt_find_table_lock(net, AF_INET, get.name); |
eb1a6bdc | 1629 | if (t) { |
5452e425 | 1630 | const struct xt_table_info *private = t->private; |
2722971c | 1631 | struct xt_table_info info; |
2722971c | 1632 | ret = compat_table_info(private, &info); |
d7cdf816 | 1633 | if (!ret && get.size == info.size) |
2722971c | 1634 | ret = compat_copy_entries_to_user(private->size, |
4b478248 | 1635 | t, uptr->entrytable); |
d7cdf816 | 1636 | else if (!ret) |
544473c1 | 1637 | ret = -EAGAIN; |
d7cdf816 | 1638 | |
b386d9f5 | 1639 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1640 | module_put(t->me); |
1641 | xt_table_unlock(t); | |
1642 | } else | |
eb1a6bdc | 1643 | ret = -ENOENT; |
1da177e4 | 1644 | |
2722971c DM |
1645 | xt_compat_unlock(AF_INET); |
1646 | return ret; | |
1647 | } | |
1da177e4 | 1648 | |
79030ed0 PM |
1649 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1650 | ||
2722971c DM |
1651 | static int |
1652 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1653 | { | |
1654 | int ret; | |
1da177e4 | 1655 | |
52e804c6 | 1656 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
82fac054 BS |
1657 | return -EPERM; |
1658 | ||
2722971c DM |
1659 | switch (cmd) { |
1660 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1661 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1662 | break; |
1663 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1664 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1665 | break; |
1666 | default: | |
79030ed0 | 1667 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1668 | } |
1da177e4 LT |
1669 | return ret; |
1670 | } | |
2722971c | 1671 | #endif |
1da177e4 LT |
1672 | |
1673 | static int | |
9c547959 | 1674 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
1675 | { |
1676 | int ret; | |
1677 | ||
52e804c6 | 1678 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1679 | return -EPERM; |
1680 | ||
1681 | switch (cmd) { | |
1682 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1683 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1684 | break; |
1685 | ||
1686 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1687 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
1688 | break; |
1689 | ||
1690 | default: | |
1da177e4 LT |
1691 | ret = -EINVAL; |
1692 | } | |
1693 | ||
1694 | return ret; | |
1695 | } | |
1696 | ||
1697 | static int | |
1698 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1699 | { | |
1700 | int ret; | |
1701 | ||
52e804c6 | 1702 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1703 | return -EPERM; |
1704 | ||
1705 | switch (cmd) { | |
2722971c | 1706 | case IPT_SO_GET_INFO: |
3b1e0a65 | 1707 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 1708 | break; |
1da177e4 | 1709 | |
2722971c | 1710 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 1711 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 1712 | break; |
1da177e4 LT |
1713 | |
1714 | case IPT_SO_GET_REVISION_MATCH: | |
1715 | case IPT_SO_GET_REVISION_TARGET: { | |
12b00c2c | 1716 | struct xt_get_revision rev; |
2e4e6a17 | 1717 | int target; |
1da177e4 LT |
1718 | |
1719 | if (*len != sizeof(rev)) { | |
1720 | ret = -EINVAL; | |
1721 | break; | |
1722 | } | |
1723 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1724 | ret = -EFAULT; | |
1725 | break; | |
1726 | } | |
78b79876 | 1727 | rev.name[sizeof(rev.name)-1] = 0; |
1da177e4 LT |
1728 | |
1729 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 1730 | target = 1; |
1da177e4 | 1731 | else |
2e4e6a17 | 1732 | target = 0; |
1da177e4 | 1733 | |
2e4e6a17 HW |
1734 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
1735 | rev.revision, | |
1736 | target, &ret), | |
1da177e4 LT |
1737 | "ipt_%s", rev.name); |
1738 | break; | |
1739 | } | |
1740 | ||
1741 | default: | |
1da177e4 LT |
1742 | ret = -EINVAL; |
1743 | } | |
1744 | ||
1745 | return ret; | |
1746 | } | |
1747 | ||
b9e69e12 FW |
1748 | static void __ipt_unregister_table(struct net *net, struct xt_table *table) |
1749 | { | |
1750 | struct xt_table_info *private; | |
1751 | void *loc_cpu_entry; | |
1752 | struct module *table_owner = table->me; | |
1753 | struct ipt_entry *iter; | |
1754 | ||
1755 | private = xt_unregister_table(table); | |
1756 | ||
1757 | /* Decrease module usage counts and free resources */ | |
1758 | loc_cpu_entry = private->entries; | |
1759 | xt_entry_foreach(iter, loc_cpu_entry, private->size) | |
1760 | cleanup_entry(iter, net); | |
1761 | if (private->number > private->initial_entries) | |
1762 | module_put(table_owner); | |
1763 | xt_free_table_info(private); | |
1764 | } | |
1765 | ||
a67dd266 FW |
1766 | int ipt_register_table(struct net *net, const struct xt_table *table, |
1767 | const struct ipt_replace *repl, | |
1768 | const struct nf_hook_ops *ops, struct xt_table **res) | |
1da177e4 LT |
1769 | { |
1770 | int ret; | |
2e4e6a17 | 1771 | struct xt_table_info *newinfo; |
f3c5c1bf | 1772 | struct xt_table_info bootstrap = {0}; |
31836064 | 1773 | void *loc_cpu_entry; |
a98da11d | 1774 | struct xt_table *new_table; |
1da177e4 | 1775 | |
2e4e6a17 | 1776 | newinfo = xt_alloc_table_info(repl->size); |
a67dd266 FW |
1777 | if (!newinfo) |
1778 | return -ENOMEM; | |
1da177e4 | 1779 | |
482cfc31 | 1780 | loc_cpu_entry = newinfo->entries; |
31836064 | 1781 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
1da177e4 | 1782 | |
0f234214 | 1783 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
1784 | if (ret != 0) |
1785 | goto out_free; | |
1da177e4 | 1786 | |
44d34e72 | 1787 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 1788 | if (IS_ERR(new_table)) { |
44d34e72 AD |
1789 | ret = PTR_ERR(new_table); |
1790 | goto out_free; | |
1da177e4 LT |
1791 | } |
1792 | ||
b9e69e12 | 1793 | /* set res now, will see skbs right after nf_register_net_hooks */ |
a67dd266 | 1794 | WRITE_ONCE(*res, new_table); |
b9e69e12 FW |
1795 | |
1796 | ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks)); | |
1797 | if (ret != 0) { | |
1798 | __ipt_unregister_table(net, new_table); | |
1799 | *res = NULL; | |
1800 | } | |
1801 | ||
a67dd266 | 1802 | return ret; |
44d34e72 AD |
1803 | |
1804 | out_free: | |
1805 | xt_free_table_info(newinfo); | |
a67dd266 | 1806 | return ret; |
1da177e4 LT |
1807 | } |
1808 | ||
a67dd266 FW |
1809 | void ipt_unregister_table(struct net *net, struct xt_table *table, |
1810 | const struct nf_hook_ops *ops) | |
1da177e4 | 1811 | { |
b9e69e12 FW |
1812 | nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks)); |
1813 | __ipt_unregister_table(net, table); | |
1da177e4 LT |
1814 | } |
1815 | ||
1816 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 1817 | static inline bool |
1da177e4 LT |
1818 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
1819 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 1820 | bool invert) |
1da177e4 | 1821 | { |
9c547959 PM |
1822 | return ((test_type == 0xFF) || |
1823 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
1824 | ^ invert; |
1825 | } | |
1826 | ||
1d93a9cb | 1827 | static bool |
62fc8051 | 1828 | icmp_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 1829 | { |
5452e425 JE |
1830 | const struct icmphdr *ic; |
1831 | struct icmphdr _icmph; | |
f7108a20 | 1832 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
1833 | |
1834 | /* Must not be a fragment. */ | |
f7108a20 | 1835 | if (par->fragoff != 0) |
1d93a9cb | 1836 | return false; |
1da177e4 | 1837 | |
f7108a20 | 1838 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
1839 | if (ic == NULL) { |
1840 | /* We've been asked to examine this packet, and we | |
1841 | * can't. Hence, no choice but to drop. | |
1842 | */ | |
b4ba2611 | 1843 | par->hotdrop = true; |
1d93a9cb | 1844 | return false; |
1da177e4 LT |
1845 | } |
1846 | ||
1847 | return icmp_type_code_match(icmpinfo->type, | |
1848 | icmpinfo->code[0], | |
1849 | icmpinfo->code[1], | |
1850 | ic->type, ic->code, | |
1851 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
1852 | } | |
1853 | ||
b0f38452 | 1854 | static int icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 1855 | { |
9b4fce7a | 1856 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 1857 | |
1d5cd909 | 1858 | /* Must specify no unknown invflags */ |
bd414ee6 | 1859 | return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
1860 | } |
1861 | ||
4538506b JE |
1862 | static struct xt_target ipt_builtin_tg[] __read_mostly = { |
1863 | { | |
243bf6e2 | 1864 | .name = XT_STANDARD_TARGET, |
4538506b JE |
1865 | .targetsize = sizeof(int), |
1866 | .family = NFPROTO_IPV4, | |
2722971c | 1867 | #ifdef CONFIG_COMPAT |
4538506b JE |
1868 | .compatsize = sizeof(compat_int_t), |
1869 | .compat_from_user = compat_standard_from_user, | |
1870 | .compat_to_user = compat_standard_to_user, | |
2722971c | 1871 | #endif |
4538506b JE |
1872 | }, |
1873 | { | |
243bf6e2 | 1874 | .name = XT_ERROR_TARGET, |
4538506b | 1875 | .target = ipt_error, |
12b00c2c | 1876 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
1877 | .family = NFPROTO_IPV4, |
1878 | }, | |
1da177e4 LT |
1879 | }; |
1880 | ||
1881 | static struct nf_sockopt_ops ipt_sockopts = { | |
1882 | .pf = PF_INET, | |
1883 | .set_optmin = IPT_BASE_CTL, | |
1884 | .set_optmax = IPT_SO_SET_MAX+1, | |
1885 | .set = do_ipt_set_ctl, | |
2722971c DM |
1886 | #ifdef CONFIG_COMPAT |
1887 | .compat_set = compat_do_ipt_set_ctl, | |
1888 | #endif | |
1da177e4 LT |
1889 | .get_optmin = IPT_BASE_CTL, |
1890 | .get_optmax = IPT_SO_GET_MAX+1, | |
1891 | .get = do_ipt_get_ctl, | |
2722971c DM |
1892 | #ifdef CONFIG_COMPAT |
1893 | .compat_get = compat_do_ipt_get_ctl, | |
1894 | #endif | |
16fcec35 | 1895 | .owner = THIS_MODULE, |
1da177e4 LT |
1896 | }; |
1897 | ||
4538506b JE |
1898 | static struct xt_match ipt_builtin_mt[] __read_mostly = { |
1899 | { | |
1900 | .name = "icmp", | |
1901 | .match = icmp_match, | |
1902 | .matchsize = sizeof(struct ipt_icmp), | |
1903 | .checkentry = icmp_checkentry, | |
1904 | .proto = IPPROTO_ICMP, | |
1905 | .family = NFPROTO_IPV4, | |
1906 | }, | |
1da177e4 LT |
1907 | }; |
1908 | ||
3cb609d5 AD |
1909 | static int __net_init ip_tables_net_init(struct net *net) |
1910 | { | |
383ca5b8 | 1911 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
1912 | } |
1913 | ||
1914 | static void __net_exit ip_tables_net_exit(struct net *net) | |
1915 | { | |
383ca5b8 | 1916 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
1917 | } |
1918 | ||
1919 | static struct pernet_operations ip_tables_net_ops = { | |
1920 | .init = ip_tables_net_init, | |
1921 | .exit = ip_tables_net_exit, | |
1922 | }; | |
1923 | ||
65b4b4e8 | 1924 | static int __init ip_tables_init(void) |
1da177e4 LT |
1925 | { |
1926 | int ret; | |
1927 | ||
3cb609d5 | 1928 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
1929 | if (ret < 0) |
1930 | goto err1; | |
2e4e6a17 | 1931 | |
25985edc | 1932 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 1933 | ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 PM |
1934 | if (ret < 0) |
1935 | goto err2; | |
4538506b | 1936 | ret = xt_register_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 PM |
1937 | if (ret < 0) |
1938 | goto err4; | |
1da177e4 LT |
1939 | |
1940 | /* Register setsockopt */ | |
1941 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
1942 | if (ret < 0) |
1943 | goto err5; | |
1da177e4 | 1944 | |
ff67e4e4 | 1945 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 1946 | return 0; |
0eff66e6 PM |
1947 | |
1948 | err5: | |
4538506b | 1949 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 | 1950 | err4: |
4538506b | 1951 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 | 1952 | err2: |
3cb609d5 | 1953 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
1954 | err1: |
1955 | return ret; | |
1da177e4 LT |
1956 | } |
1957 | ||
65b4b4e8 | 1958 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
1959 | { |
1960 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 1961 | |
4538506b JE |
1962 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
1963 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); | |
3cb609d5 | 1964 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
1965 | } |
1966 | ||
1967 | EXPORT_SYMBOL(ipt_register_table); | |
1968 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 1969 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
1970 | module_init(ip_tables_init); |
1971 | module_exit(ip_tables_fini); |