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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 | |
6b7d31fc | 6 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
f229f6ce | 7 | * Copyright (c) 2006-2010 Patrick McHardy <kaber@trash.net> |
1da177e4 | 8 | */ |
a81b2ce8 | 9 | |
90e7d4ab | 10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
a81b2ce8 JP |
11 | |
12 | #include <linux/kernel.h> | |
4fc268d2 | 13 | #include <linux/capability.h> |
14c85021 | 14 | #include <linux/in.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> | |
4bdbf6c0 | 20 | #include <linux/poison.h> |
1da177e4 | 21 | #include <linux/icmpv6.h> |
1da177e4 | 22 | #include <net/ipv6.h> |
3bc3fe5e | 23 | #include <net/compat.h> |
7c0f6ba6 | 24 | #include <linux/uaccess.h> |
57b47a53 | 25 | #include <linux/mutex.h> |
1da177e4 | 26 | #include <linux/proc_fs.h> |
3bc3fe5e | 27 | #include <linux/err.h> |
c8923c6b | 28 | #include <linux/cpumask.h> |
1da177e4 LT |
29 | |
30 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
2e4e6a17 | 31 | #include <linux/netfilter/x_tables.h> |
f01ffbd6 | 32 | #include <net/netfilter/nf_log.h> |
e3eaa991 | 33 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
34 | |
35 | MODULE_LICENSE("GPL"); | |
36 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
37 | MODULE_DESCRIPTION("IPv6 packet filter"); | |
a44f6d82 | 38 | MODULE_ALIAS("ip6t_icmp6"); |
1da177e4 | 39 | |
e3eaa991 JE |
40 | void *ip6t_alloc_initial_table(const struct xt_table *info) |
41 | { | |
42 | return xt_alloc_initial_table(ip6t, IP6T); | |
43 | } | |
44 | EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table); | |
45 | ||
1da177e4 | 46 | /* Returns whether matches rule or not. */ |
022748a9 | 47 | /* Performance critical - called for every packet */ |
1d93a9cb | 48 | static inline bool |
1da177e4 LT |
49 | ip6_packet_match(const struct sk_buff *skb, |
50 | const char *indev, | |
51 | const char *outdev, | |
52 | const struct ip6t_ip6 *ip6info, | |
53 | unsigned int *protoff, | |
586d5a8b | 54 | u16 *fragoff, bool *hotdrop) |
1da177e4 | 55 | { |
1da177e4 | 56 | unsigned long ret; |
0660e03f | 57 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
1da177e4 | 58 | |
c37a2dfa JP |
59 | if (NF_INVF(ip6info, IP6T_INV_SRCIP, |
60 | ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, | |
61 | &ip6info->src)) || | |
62 | NF_INVF(ip6info, IP6T_INV_DSTIP, | |
63 | ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, | |
64 | &ip6info->dst))) | |
1d93a9cb | 65 | return false; |
1da177e4 | 66 | |
b8dfe498 | 67 | ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask); |
1da177e4 | 68 | |
c37a2dfa | 69 | if (NF_INVF(ip6info, IP6T_INV_VIA_IN, ret != 0)) |
1d93a9cb | 70 | return false; |
1da177e4 | 71 | |
b8dfe498 | 72 | ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask); |
1da177e4 | 73 | |
c37a2dfa | 74 | if (NF_INVF(ip6info, IP6T_INV_VIA_OUT, ret != 0)) |
1d93a9cb | 75 | return false; |
1da177e4 LT |
76 | |
77 | /* ... might want to do something with class and flowlabel here ... */ | |
78 | ||
79 | /* look for the desired protocol header */ | |
4305ae44 | 80 | if (ip6info->flags & IP6T_F_PROTO) { |
b777e0ce PM |
81 | int protohdr; |
82 | unsigned short _frag_off; | |
1da177e4 | 83 | |
84018f55 | 84 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off, NULL); |
51d8b1a6 PM |
85 | if (protohdr < 0) { |
86 | if (_frag_off == 0) | |
cff533ac | 87 | *hotdrop = true; |
1d93a9cb | 88 | return false; |
51d8b1a6 | 89 | } |
b777e0ce | 90 | *fragoff = _frag_off; |
1da177e4 | 91 | |
b777e0ce | 92 | if (ip6info->proto == protohdr) { |
4305ae44 | 93 | if (ip6info->invflags & IP6T_INV_PROTO) |
1d93a9cb | 94 | return false; |
4305ae44 | 95 | |
1d93a9cb | 96 | return true; |
1da177e4 LT |
97 | } |
98 | ||
99 | /* We need match for the '-p all', too! */ | |
100 | if ((ip6info->proto != 0) && | |
101 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
1d93a9cb | 102 | return false; |
1da177e4 | 103 | } |
1d93a9cb | 104 | return true; |
1da177e4 LT |
105 | } |
106 | ||
107 | /* should be ip6 safe */ | |
022748a9 | 108 | static bool |
1da177e4 LT |
109 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
110 | { | |
d7cdf816 | 111 | if (ipv6->flags & ~IP6T_F_MASK) |
ccb79bdc | 112 | return false; |
d7cdf816 | 113 | if (ipv6->invflags & ~IP6T_INV_MASK) |
ccb79bdc | 114 | return false; |
d7cdf816 | 115 | |
ccb79bdc | 116 | return true; |
1da177e4 LT |
117 | } |
118 | ||
119 | static unsigned int | |
4b560b44 | 120 | ip6t_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 121 | { |
e87cc472 | 122 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
123 | |
124 | return NF_DROP; | |
125 | } | |
126 | ||
1da177e4 | 127 | static inline struct ip6t_entry * |
d5d1baa1 | 128 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
129 | { |
130 | return (struct ip6t_entry *)(base + offset); | |
131 | } | |
132 | ||
ba9dda3a | 133 | /* All zeroes == unconditional rule. */ |
022748a9 | 134 | /* Mildly perf critical (only if packet tracing is on) */ |
54d83fc7 | 135 | static inline bool unconditional(const struct ip6t_entry *e) |
ba9dda3a | 136 | { |
47901dc2 | 137 | static const struct ip6t_ip6 uncond; |
ba9dda3a | 138 | |
54d83fc7 FW |
139 | return e->target_offset == sizeof(struct ip6t_entry) && |
140 | memcmp(&e->ipv6, &uncond, sizeof(uncond)) == 0; | |
ba9dda3a JK |
141 | } |
142 | ||
87a2e70d | 143 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
144 | ip6t_get_target_c(const struct ip6t_entry *e) |
145 | { | |
146 | return ip6t_get_target((struct ip6t_entry *)e); | |
147 | } | |
148 | ||
07a93626 | 149 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
ba9dda3a | 150 | /* This cries for unification! */ |
022748a9 | 151 | static const char *const hooknames[] = { |
6e23ae2a PM |
152 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
153 | [NF_INET_LOCAL_IN] = "INPUT", | |
154 | [NF_INET_FORWARD] = "FORWARD", | |
155 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
156 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
157 | }; |
158 | ||
159 | enum nf_ip_trace_comments { | |
160 | NF_IP6_TRACE_COMMENT_RULE, | |
161 | NF_IP6_TRACE_COMMENT_RETURN, | |
162 | NF_IP6_TRACE_COMMENT_POLICY, | |
163 | }; | |
164 | ||
022748a9 | 165 | static const char *const comments[] = { |
ba9dda3a JK |
166 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
167 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
168 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
169 | }; | |
170 | ||
549d2d41 | 171 | static const struct nf_loginfo trace_loginfo = { |
ba9dda3a JK |
172 | .type = NF_LOG_TYPE_LOG, |
173 | .u = { | |
174 | .log = { | |
a81b2ce8 | 175 | .level = LOGLEVEL_WARNING, |
ff107d27 | 176 | .logflags = NF_LOG_DEFAULT_MASK, |
ba9dda3a JK |
177 | }, |
178 | }, | |
179 | }; | |
180 | ||
022748a9 | 181 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 182 | static inline int |
d5d1baa1 | 183 | get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e, |
4f2f6f23 JE |
184 | const char *hookname, const char **chainname, |
185 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 186 | { |
87a2e70d | 187 | const struct xt_standard_target *t = (void *)ip6t_get_target_c(s); |
ba9dda3a | 188 | |
243bf6e2 | 189 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
190 | /* Head of user chain: ERROR target with chainname */ |
191 | *chainname = t->target.data; | |
192 | (*rulenum) = 0; | |
193 | } else if (s == e) { | |
194 | (*rulenum)++; | |
195 | ||
54d83fc7 | 196 | if (unconditional(s) && |
3666ed1c | 197 | strcmp(t->target.u.kernel.target->name, |
243bf6e2 | 198 | XT_STANDARD_TARGET) == 0 && |
54d83fc7 | 199 | t->verdict < 0) { |
ba9dda3a JK |
200 | /* Tail of chains: STANDARD target (return/policy) */ |
201 | *comment = *chainname == hookname | |
4f2f6f23 JE |
202 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
203 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
204 | } |
205 | return 1; | |
206 | } else | |
207 | (*rulenum)++; | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
9dff2c96 EB |
212 | static void trace_packet(struct net *net, |
213 | const struct sk_buff *skb, | |
ba9dda3a JK |
214 | unsigned int hook, |
215 | const struct net_device *in, | |
216 | const struct net_device *out, | |
ecb6f85e | 217 | const char *tablename, |
d5d1baa1 JE |
218 | const struct xt_table_info *private, |
219 | const struct ip6t_entry *e) | |
ba9dda3a | 220 | { |
5452e425 | 221 | const struct ip6t_entry *root; |
4f2f6f23 | 222 | const char *hookname, *chainname, *comment; |
72b2b1dd | 223 | const struct ip6t_entry *iter; |
ba9dda3a JK |
224 | unsigned int rulenum = 0; |
225 | ||
482cfc31 | 226 | root = get_entry(private->entries, private->hook_entry[hook]); |
ba9dda3a | 227 | |
4f2f6f23 JE |
228 | hookname = chainname = hooknames[hook]; |
229 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; | |
ba9dda3a | 230 | |
72b2b1dd JE |
231 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
232 | if (get_chainname_rulenum(iter, e, hookname, | |
233 | &chainname, &comment, &rulenum) != 0) | |
234 | break; | |
ba9dda3a | 235 | |
4017a7ee PNA |
236 | nf_log_trace(net, AF_INET6, hook, skb, in, out, &trace_loginfo, |
237 | "TRACE: %s:%s:%s:%u ", | |
238 | tablename, chainname, comment, rulenum); | |
ba9dda3a JK |
239 | } |
240 | #endif | |
241 | ||
6c7941de | 242 | static inline struct ip6t_entry * |
98e86403 JE |
243 | ip6t_next_entry(const struct ip6t_entry *entry) |
244 | { | |
245 | return (void *)entry + entry->next_offset; | |
246 | } | |
247 | ||
1da177e4 LT |
248 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
249 | unsigned int | |
3db05fea | 250 | ip6t_do_table(struct sk_buff *skb, |
8f8a3715 | 251 | const struct nf_hook_state *state, |
fe1cb108 | 252 | struct xt_table *table) |
1da177e4 | 253 | { |
6cb8ff3f | 254 | unsigned int hook = state->hook; |
6b7d31fc | 255 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
256 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
257 | unsigned int verdict = NF_DROP; | |
258 | const char *indev, *outdev; | |
d5d1baa1 | 259 | const void *table_base; |
f3c5c1bf | 260 | struct ip6t_entry *e, **jumpstack; |
7814b6ec | 261 | unsigned int stackidx, cpu; |
d5d1baa1 | 262 | const struct xt_table_info *private; |
de74c169 | 263 | struct xt_action_param acpar; |
7f5c6d4f | 264 | unsigned int addend; |
1da177e4 LT |
265 | |
266 | /* Initialization */ | |
7814b6ec | 267 | stackidx = 0; |
8f8a3715 DM |
268 | indev = state->in ? state->in->name : nulldevname; |
269 | outdev = state->out ? state->out->name : nulldevname; | |
1da177e4 LT |
270 | /* We handle fragments by dealing with the first fragment as |
271 | * if it was a normal packet. All other fragments are treated | |
272 | * normally, except that they will NEVER match rules that ask | |
273 | * things we don't know, ie. tcp syn flag or ports). If the | |
274 | * rule is also a fragment-specific rule, non-fragments won't | |
275 | * match it. */ | |
310e2d43 | 276 | acpar.fragoff = 0; |
b4ba2611 | 277 | acpar.hotdrop = false; |
613dbd95 | 278 | acpar.state = state; |
1da177e4 | 279 | |
9efdb14f | 280 | WARN_ON(!(table->valid_hooks & (1 << hook))); |
78454473 | 281 | |
7f5c6d4f ED |
282 | local_bh_disable(); |
283 | addend = xt_write_recseq_begin(); | |
d3d40f23 | 284 | private = READ_ONCE(table->private); /* Address dependency. */ |
f3c5c1bf | 285 | cpu = smp_processor_id(); |
482cfc31 | 286 | table_base = private->entries; |
f3c5c1bf | 287 | jumpstack = (struct ip6t_entry **)private->jumpstack[cpu]; |
7814b6ec FW |
288 | |
289 | /* Switch to alternate jumpstack if we're being invoked via TEE. | |
290 | * TEE issues XT_CONTINUE verdict on original skb so we must not | |
291 | * clobber the jumpstack. | |
292 | * | |
293 | * For recursion via REJECT or SYNPROXY the stack will be clobbered | |
294 | * but it is no problem since absolute verdict is issued by these. | |
295 | */ | |
dcebd315 FW |
296 | if (static_key_false(&xt_tee_enabled)) |
297 | jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated); | |
78454473 | 298 | |
2e4e6a17 | 299 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 300 | |
1da177e4 | 301 | do { |
87a2e70d | 302 | const struct xt_entry_target *t; |
dcea992a | 303 | const struct xt_entry_match *ematch; |
71ae0dff | 304 | struct xt_counters *counter; |
a1ff4ac8 | 305 | |
9efdb14f | 306 | WARN_ON(!e); |
84018f55 | 307 | acpar.thoff = 0; |
a1ff4ac8 | 308 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
b4ba2611 | 309 | &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) { |
dcea992a | 310 | no_match: |
a1ff4ac8 JE |
311 | e = ip6t_next_entry(e); |
312 | continue; | |
313 | } | |
1da177e4 | 314 | |
ef53d702 | 315 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
316 | acpar.match = ematch->u.kernel.match; |
317 | acpar.matchinfo = ematch->data; | |
318 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 319 | goto no_match; |
ef53d702 | 320 | } |
dcea992a | 321 | |
71ae0dff FW |
322 | counter = xt_get_this_cpu_counter(&e->counters); |
323 | ADD_COUNTER(*counter, skb->len, 1); | |
1da177e4 | 324 | |
d5d1baa1 | 325 | t = ip6t_get_target_c(e); |
9efdb14f | 326 | WARN_ON(!t->u.kernel.target); |
ba9dda3a | 327 | |
07a93626 | 328 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
329 | /* The packet is traced: log it */ |
330 | if (unlikely(skb->nf_trace)) | |
9dff2c96 EB |
331 | trace_packet(state->net, skb, hook, state->in, |
332 | state->out, table->name, private, e); | |
ba9dda3a | 333 | #endif |
a1ff4ac8 JE |
334 | /* Standard target? */ |
335 | if (!t->u.kernel.target->target) { | |
336 | int v; | |
337 | ||
87a2e70d | 338 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
339 | if (v < 0) { |
340 | /* Pop from stack? */ | |
243bf6e2 | 341 | if (v != XT_RETURN) { |
95c96174 | 342 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 343 | break; |
1da177e4 | 344 | } |
7814b6ec | 345 | if (stackidx == 0) |
f3c5c1bf JE |
346 | e = get_entry(table_base, |
347 | private->underflow[hook]); | |
348 | else | |
7814b6ec | 349 | e = ip6t_next_entry(jumpstack[--stackidx]); |
a1ff4ac8 JE |
350 | continue; |
351 | } | |
3666ed1c JP |
352 | if (table_base + v != ip6t_next_entry(e) && |
353 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
57ebd808 FW |
354 | if (unlikely(stackidx >= private->stacksize)) { |
355 | verdict = NF_DROP; | |
356 | break; | |
357 | } | |
7814b6ec | 358 | jumpstack[stackidx++] = e; |
a1ff4ac8 | 359 | } |
1da177e4 | 360 | |
a1ff4ac8 | 361 | e = get_entry(table_base, v); |
7a6b1c46 JE |
362 | continue; |
363 | } | |
364 | ||
de74c169 JE |
365 | acpar.target = t->u.kernel.target; |
366 | acpar.targinfo = t->data; | |
7eb35586 | 367 | |
de74c169 | 368 | verdict = t->u.kernel.target->target(skb, &acpar); |
243bf6e2 | 369 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
370 | e = ip6t_next_entry(e); |
371 | else | |
372 | /* Verdict */ | |
373 | break; | |
b4ba2611 | 374 | } while (!acpar.hotdrop); |
1da177e4 | 375 | |
7695495d IM |
376 | xt_write_recseq_end(addend); |
377 | local_bh_enable(); | |
1da177e4 | 378 | |
b4ba2611 | 379 | if (acpar.hotdrop) |
1da177e4 LT |
380 | return NF_DROP; |
381 | else return verdict; | |
1da177e4 LT |
382 | } |
383 | ||
2dbb6413 FW |
384 | static bool next_offset_ok(const struct xt_table_info *t, unsigned int newpos) |
385 | { | |
386 | if (newpos > t->size - sizeof(struct ip6t_entry)) | |
387 | return false; | |
388 | ||
389 | if (newpos % __alignof__(struct ip6t_entry) != 0) | |
390 | return false; | |
391 | ||
392 | return true; | |
393 | } | |
394 | ||
1da177e4 | 395 | /* Figures out from what hook each rule can be called: returns 0 if |
98dbbfc3 | 396 | there are loops. Puts hook bitmask in comefrom. */ |
1da177e4 | 397 | static int |
98dbbfc3 | 398 | mark_source_chains(const struct xt_table_info *newinfo, |
f4dc7771 FW |
399 | unsigned int valid_hooks, void *entry0, |
400 | unsigned int *offsets) | |
1da177e4 LT |
401 | { |
402 | unsigned int hook; | |
403 | ||
404 | /* No recursion; use packet counter to save back ptrs (reset | |
405 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 406 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 407 | unsigned int pos = newinfo->hook_entry[hook]; |
68ad546a | 408 | struct ip6t_entry *e = entry0 + pos; |
1da177e4 LT |
409 | |
410 | if (!(valid_hooks & (1 << hook))) | |
411 | continue; | |
412 | ||
413 | /* Set initial back pointer. */ | |
414 | e->counters.pcnt = pos; | |
415 | ||
416 | for (;;) { | |
87a2e70d | 417 | const struct xt_standard_target *t |
d5d1baa1 | 418 | = (void *)ip6t_get_target_c(e); |
9c547959 | 419 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 420 | |
d7cdf816 | 421 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) |
1da177e4 | 422 | return 0; |
d7cdf816 | 423 | |
9c547959 | 424 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
425 | |
426 | /* Unconditional return/END. */ | |
54d83fc7 | 427 | if ((unconditional(e) && |
3666ed1c | 428 | (strcmp(t->target.u.user.name, |
243bf6e2 | 429 | XT_STANDARD_TARGET) == 0) && |
54d83fc7 | 430 | t->verdict < 0) || visited) { |
1da177e4 LT |
431 | unsigned int oldpos, size; |
432 | ||
433 | /* Return: backtrack through the last | |
434 | big jump. */ | |
435 | do { | |
6e23ae2a | 436 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
437 | oldpos = pos; |
438 | pos = e->counters.pcnt; | |
439 | e->counters.pcnt = 0; | |
440 | ||
441 | /* We're at the start. */ | |
442 | if (pos == oldpos) | |
443 | goto next; | |
444 | ||
68ad546a | 445 | e = entry0 + pos; |
1da177e4 LT |
446 | } while (oldpos == pos + e->next_offset); |
447 | ||
448 | /* Move along one */ | |
449 | size = e->next_offset; | |
2dbb6413 FW |
450 | if (!next_offset_ok(newinfo, pos + size)) |
451 | return 0; | |
68ad546a | 452 | e = entry0 + pos + size; |
f24e230d FW |
453 | if (pos + size >= newinfo->size) |
454 | return 0; | |
1da177e4 LT |
455 | e->counters.pcnt = pos; |
456 | pos += size; | |
457 | } else { | |
458 | int newpos = t->verdict; | |
459 | ||
460 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 461 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 462 | newpos >= 0) { |
1da177e4 | 463 | /* This a jump; chase it. */ |
f4dc7771 FW |
464 | if (!xt_find_jump_offset(offsets, newpos, |
465 | newinfo->number)) | |
466 | return 0; | |
1da177e4 LT |
467 | } else { |
468 | /* ... this is a fallthru */ | |
469 | newpos = pos + e->next_offset; | |
f24e230d FW |
470 | if (newpos >= newinfo->size) |
471 | return 0; | |
1da177e4 | 472 | } |
2dbb6413 FW |
473 | |
474 | if (!next_offset_ok(newinfo, newpos)) | |
475 | return 0; | |
476 | ||
68ad546a | 477 | e = entry0 + newpos; |
1da177e4 LT |
478 | e->counters.pcnt = pos; |
479 | pos = newpos; | |
480 | } | |
481 | } | |
d7cdf816 | 482 | next: ; |
1da177e4 LT |
483 | } |
484 | return 1; | |
485 | } | |
486 | ||
87a2e70d | 487 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 488 | { |
6be3d859 JE |
489 | struct xt_mtdtor_param par; |
490 | ||
f54e9367 | 491 | par.net = net; |
6be3d859 JE |
492 | par.match = m->u.kernel.match; |
493 | par.matchinfo = m->data; | |
916a917d | 494 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
495 | if (par.match->destroy != NULL) |
496 | par.match->destroy(&par); | |
497 | module_put(par.match->me); | |
1da177e4 LT |
498 | } |
499 | ||
87a2e70d | 500 | static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
f173c8a1 | 501 | { |
9b4fce7a | 502 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 | 503 | |
9b4fce7a JE |
504 | par->match = m->u.kernel.match; |
505 | par->matchinfo = m->data; | |
506 | ||
d7cdf816 PNA |
507 | return xt_check_match(par, m->u.match_size - sizeof(*m), |
508 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); | |
f173c8a1 PM |
509 | } |
510 | ||
022748a9 | 511 | static int |
87a2e70d | 512 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 513 | { |
6709dbbb | 514 | struct xt_match *match; |
3cdc7c95 | 515 | int ret; |
1da177e4 | 516 | |
fd0ec0e6 JE |
517 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
518 | m->u.user.revision); | |
d7cdf816 | 519 | if (IS_ERR(match)) |
fd0ec0e6 | 520 | return PTR_ERR(match); |
d7cdf816 | 521 | |
1da177e4 | 522 | m->u.kernel.match = match; |
1da177e4 | 523 | |
6bdb331b | 524 | ret = check_match(m, par); |
3cdc7c95 PM |
525 | if (ret) |
526 | goto err; | |
527 | ||
1da177e4 | 528 | return 0; |
3cdc7c95 PM |
529 | err: |
530 | module_put(m->u.kernel.match->me); | |
531 | return ret; | |
1da177e4 LT |
532 | } |
533 | ||
add67461 | 534 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 535 | { |
87a2e70d | 536 | struct xt_entry_target *t = ip6t_get_target(e); |
af5d6dc2 | 537 | struct xt_tgchk_param par = { |
add67461 | 538 | .net = net, |
af5d6dc2 JE |
539 | .table = name, |
540 | .entryinfo = e, | |
541 | .target = t->u.kernel.target, | |
542 | .targinfo = t->data, | |
543 | .hook_mask = e->comefrom, | |
916a917d | 544 | .family = NFPROTO_IPV6, |
af5d6dc2 | 545 | }; |
1da177e4 | 546 | |
d7cdf816 PNA |
547 | return xt_check_target(&par, t->u.target_size - sizeof(*t), |
548 | e->ipv6.proto, | |
549 | e->ipv6.invflags & IP6T_INV_PROTO); | |
f173c8a1 | 550 | } |
1da177e4 | 551 | |
022748a9 | 552 | static int |
a83d8e8d | 553 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
ae0ac0ed FW |
554 | unsigned int size, |
555 | struct xt_percpu_counter_alloc_state *alloc_state) | |
f173c8a1 | 556 | { |
87a2e70d | 557 | struct xt_entry_target *t; |
f173c8a1 PM |
558 | struct xt_target *target; |
559 | int ret; | |
560 | unsigned int j; | |
9b4fce7a | 561 | struct xt_mtchk_param mtpar; |
dcea992a | 562 | struct xt_entry_match *ematch; |
f173c8a1 | 563 | |
ae0ac0ed | 564 | if (!xt_percpu_counter_alloc(alloc_state, &e->counters)) |
71ae0dff FW |
565 | return -ENOMEM; |
566 | ||
1da177e4 | 567 | j = 0; |
c568503e | 568 | memset(&mtpar, 0, sizeof(mtpar)); |
a83d8e8d | 569 | mtpar.net = net; |
9b4fce7a JE |
570 | mtpar.table = name; |
571 | mtpar.entryinfo = &e->ipv6; | |
572 | mtpar.hook_mask = e->comefrom; | |
916a917d | 573 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 574 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 575 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 576 | if (ret != 0) |
6bdb331b JE |
577 | goto cleanup_matches; |
578 | ++j; | |
dcea992a | 579 | } |
1da177e4 LT |
580 | |
581 | t = ip6t_get_target(e); | |
d2a7b6ba JE |
582 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
583 | t->u.user.revision); | |
584 | if (IS_ERR(target)) { | |
d2a7b6ba | 585 | ret = PTR_ERR(target); |
1da177e4 LT |
586 | goto cleanup_matches; |
587 | } | |
588 | t->u.kernel.target = target; | |
6b7d31fc | 589 | |
add67461 | 590 | ret = check_target(e, net, name); |
3cdc7c95 PM |
591 | if (ret) |
592 | goto err; | |
1da177e4 | 593 | return 0; |
3cdc7c95 PM |
594 | err: |
595 | module_put(t->u.kernel.target->me); | |
1da177e4 | 596 | cleanup_matches: |
6bdb331b JE |
597 | xt_ematch_foreach(ematch, e) { |
598 | if (j-- == 0) | |
dcea992a | 599 | break; |
6bdb331b JE |
600 | cleanup_match(ematch, net); |
601 | } | |
71ae0dff | 602 | |
4d31eef5 | 603 | xt_percpu_counter_free(&e->counters); |
71ae0dff | 604 | |
1da177e4 LT |
605 | return ret; |
606 | } | |
607 | ||
d5d1baa1 | 608 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 | 609 | { |
87a2e70d | 610 | const struct xt_entry_target *t; |
e2fe35c1 JE |
611 | unsigned int verdict; |
612 | ||
54d83fc7 | 613 | if (!unconditional(e)) |
e2fe35c1 | 614 | return false; |
d5d1baa1 | 615 | t = ip6t_get_target_c(e); |
e2fe35c1 JE |
616 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
617 | return false; | |
87a2e70d | 618 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
619 | verdict = -verdict - 1; |
620 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
621 | } | |
622 | ||
022748a9 | 623 | static int |
1da177e4 | 624 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 625 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
626 | const unsigned char *base, |
627 | const unsigned char *limit, | |
1da177e4 LT |
628 | const unsigned int *hook_entries, |
629 | const unsigned int *underflows, | |
0559518b | 630 | unsigned int valid_hooks) |
1da177e4 LT |
631 | { |
632 | unsigned int h; | |
bdf533de | 633 | int err; |
1da177e4 | 634 | |
3666ed1c | 635 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
6e94e0cf | 636 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit || |
d7cdf816 | 637 | (unsigned char *)e + e->next_offset > limit) |
1da177e4 | 638 | return -EINVAL; |
1da177e4 LT |
639 | |
640 | if (e->next_offset | |
d7cdf816 | 641 | < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) |
1da177e4 | 642 | return -EINVAL; |
1da177e4 | 643 | |
aa412ba2 FW |
644 | if (!ip6_checkentry(&e->ipv6)) |
645 | return -EINVAL; | |
646 | ||
ce683e5f FW |
647 | err = xt_check_entry_offsets(e, e->elems, e->target_offset, |
648 | e->next_offset); | |
bdf533de FW |
649 | if (err) |
650 | return err; | |
651 | ||
1da177e4 | 652 | /* Check hooks & underflows */ |
6e23ae2a | 653 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
654 | if (!(valid_hooks & (1 << h))) |
655 | continue; | |
1da177e4 LT |
656 | if ((unsigned char *)e - base == hook_entries[h]) |
657 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 658 | if ((unsigned char *)e - base == underflows[h]) { |
d7cdf816 | 659 | if (!check_underflow(e)) |
90e7d4ab | 660 | return -EINVAL; |
d7cdf816 | 661 | |
1da177e4 | 662 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 663 | } |
1da177e4 LT |
664 | } |
665 | ||
1da177e4 | 666 | /* Clear counters and comefrom */ |
2e4e6a17 | 667 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 668 | e->comefrom = 0; |
1da177e4 LT |
669 | return 0; |
670 | } | |
671 | ||
0559518b | 672 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
1da177e4 | 673 | { |
a2df1648 | 674 | struct xt_tgdtor_param par; |
87a2e70d | 675 | struct xt_entry_target *t; |
dcea992a | 676 | struct xt_entry_match *ematch; |
1da177e4 | 677 | |
1da177e4 | 678 | /* Cleanup all matches */ |
dcea992a | 679 | xt_ematch_foreach(ematch, e) |
6bdb331b | 680 | cleanup_match(ematch, net); |
1da177e4 | 681 | t = ip6t_get_target(e); |
a2df1648 | 682 | |
add67461 | 683 | par.net = net; |
a2df1648 JE |
684 | par.target = t->u.kernel.target; |
685 | par.targinfo = t->data; | |
916a917d | 686 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
687 | if (par.target->destroy != NULL) |
688 | par.target->destroy(&par); | |
689 | module_put(par.target->me); | |
4d31eef5 | 690 | xt_percpu_counter_free(&e->counters); |
1da177e4 LT |
691 | } |
692 | ||
693 | /* Checks and translates the user-supplied table segment (held in | |
694 | newinfo) */ | |
695 | static int | |
0f234214 | 696 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
cda219c6 | 697 | const struct ip6t_replace *repl) |
1da177e4 | 698 | { |
ae0ac0ed | 699 | struct xt_percpu_counter_alloc_state alloc_state = { 0 }; |
72b2b1dd | 700 | struct ip6t_entry *iter; |
f4dc7771 | 701 | unsigned int *offsets; |
1da177e4 | 702 | unsigned int i; |
72b2b1dd | 703 | int ret = 0; |
1da177e4 | 704 | |
0f234214 JE |
705 | newinfo->size = repl->size; |
706 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
707 | |
708 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 709 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
710 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
711 | newinfo->underflow[i] = 0xFFFFFFFF; | |
712 | } | |
713 | ||
f4dc7771 FW |
714 | offsets = xt_alloc_entry_offsets(newinfo->number); |
715 | if (!offsets) | |
716 | return -ENOMEM; | |
1da177e4 LT |
717 | i = 0; |
718 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
719 | xt_entry_foreach(iter, entry0, newinfo->size) { |
720 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
721 | entry0 + repl->size, |
722 | repl->hook_entry, | |
723 | repl->underflow, | |
724 | repl->valid_hooks); | |
72b2b1dd | 725 | if (ret != 0) |
f4dc7771 FW |
726 | goto out_free; |
727 | if (i < repl->num_entries) | |
728 | offsets[i] = (void *)iter - entry0; | |
0559518b | 729 | ++i; |
98dbbfc3 FW |
730 | if (strcmp(ip6t_get_target(iter)->u.user.name, |
731 | XT_ERROR_TARGET) == 0) | |
732 | ++newinfo->stacksize; | |
72b2b1dd | 733 | } |
1da177e4 | 734 | |
f4dc7771 | 735 | ret = -EINVAL; |
d7cdf816 | 736 | if (i != repl->num_entries) |
f4dc7771 | 737 | goto out_free; |
1da177e4 | 738 | |
1b293e30 FW |
739 | ret = xt_check_table_hooks(newinfo, repl->valid_hooks); |
740 | if (ret) | |
741 | goto out_free; | |
1da177e4 | 742 | |
f4dc7771 FW |
743 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) { |
744 | ret = -ELOOP; | |
745 | goto out_free; | |
746 | } | |
747 | kvfree(offsets); | |
74c9c0c1 | 748 | |
1da177e4 LT |
749 | /* Finally, each sanity check must pass */ |
750 | i = 0; | |
72b2b1dd | 751 | xt_entry_foreach(iter, entry0, newinfo->size) { |
ae0ac0ed FW |
752 | ret = find_check_entry(iter, net, repl->name, repl->size, |
753 | &alloc_state); | |
72b2b1dd JE |
754 | if (ret != 0) |
755 | break; | |
0559518b | 756 | ++i; |
72b2b1dd | 757 | } |
1da177e4 | 758 | |
74c9c0c1 | 759 | if (ret != 0) { |
0559518b JE |
760 | xt_entry_foreach(iter, entry0, newinfo->size) { |
761 | if (i-- == 0) | |
72b2b1dd | 762 | break; |
0559518b JE |
763 | cleanup_entry(iter, net); |
764 | } | |
74c9c0c1 DM |
765 | return ret; |
766 | } | |
1da177e4 | 767 | |
f4dc7771 FW |
768 | return ret; |
769 | out_free: | |
770 | kvfree(offsets); | |
9c547959 | 771 | return ret; |
1da177e4 LT |
772 | } |
773 | ||
1da177e4 | 774 | static void |
2e4e6a17 HW |
775 | get_counters(const struct xt_table_info *t, |
776 | struct xt_counters counters[]) | |
1da177e4 | 777 | { |
72b2b1dd | 778 | struct ip6t_entry *iter; |
1da177e4 LT |
779 | unsigned int cpu; |
780 | unsigned int i; | |
781 | ||
6f912042 | 782 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 783 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 784 | |
1da177e4 | 785 | i = 0; |
482cfc31 | 786 | xt_entry_foreach(iter, t->entries, t->size) { |
71ae0dff | 787 | struct xt_counters *tmp; |
83723d60 ED |
788 | u64 bcnt, pcnt; |
789 | unsigned int start; | |
790 | ||
71ae0dff | 791 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
83723d60 | 792 | do { |
7f5c6d4f | 793 | start = read_seqcount_begin(s); |
71ae0dff FW |
794 | bcnt = tmp->bcnt; |
795 | pcnt = tmp->pcnt; | |
7f5c6d4f | 796 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
797 | |
798 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b | 799 | ++i; |
a5d7a714 | 800 | cond_resched(); |
0559518b | 801 | } |
1da177e4 | 802 | } |
78454473 SH |
803 | } |
804 | ||
d13e7b2e FW |
805 | static void get_old_counters(const struct xt_table_info *t, |
806 | struct xt_counters counters[]) | |
807 | { | |
808 | struct ip6t_entry *iter; | |
809 | unsigned int cpu, i; | |
810 | ||
811 | for_each_possible_cpu(cpu) { | |
812 | i = 0; | |
813 | xt_entry_foreach(iter, t->entries, t->size) { | |
814 | const struct xt_counters *tmp; | |
815 | ||
816 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); | |
817 | ADD_COUNTER(counters[i], tmp->bcnt, tmp->pcnt); | |
818 | ++i; | |
819 | } | |
820 | cond_resched(); | |
821 | } | |
822 | } | |
823 | ||
d5d1baa1 | 824 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 825 | { |
ed1a6f5e | 826 | unsigned int countersize; |
2e4e6a17 | 827 | struct xt_counters *counters; |
d3d40f23 | 828 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
829 | |
830 | /* We need atomic snapshot of counters: rest doesn't change | |
831 | (other than comefrom, which userspace doesn't care | |
832 | about). */ | |
2e4e6a17 | 833 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 834 | counters = vzalloc(countersize); |
1da177e4 LT |
835 | |
836 | if (counters == NULL) | |
942e4a2b | 837 | return ERR_PTR(-ENOMEM); |
78454473 | 838 | |
942e4a2b | 839 | get_counters(private, counters); |
78454473 | 840 | |
49a88d18 | 841 | return counters; |
ed1a6f5e PM |
842 | } |
843 | ||
844 | static int | |
845 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 846 | const struct xt_table *table, |
ed1a6f5e PM |
847 | void __user *userptr) |
848 | { | |
849 | unsigned int off, num; | |
d5d1baa1 | 850 | const struct ip6t_entry *e; |
ed1a6f5e | 851 | struct xt_counters *counters; |
d3d40f23 | 852 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 853 | int ret = 0; |
711bdde6 | 854 | const void *loc_cpu_entry; |
ed1a6f5e PM |
855 | |
856 | counters = alloc_counters(table); | |
857 | if (IS_ERR(counters)) | |
858 | return PTR_ERR(counters); | |
859 | ||
482cfc31 | 860 | loc_cpu_entry = private->entries; |
1da177e4 LT |
861 | |
862 | /* FIXME: use iterator macros --RR */ | |
863 | /* ... then go back and fix counters and names */ | |
864 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
865 | unsigned int i; | |
87a2e70d JE |
866 | const struct xt_entry_match *m; |
867 | const struct xt_entry_target *t; | |
1da177e4 | 868 | |
68ad546a | 869 | e = loc_cpu_entry + off; |
e47ddb2c WB |
870 | if (copy_to_user(userptr + off, e, sizeof(*e))) { |
871 | ret = -EFAULT; | |
872 | goto free_counters; | |
873 | } | |
1da177e4 LT |
874 | if (copy_to_user(userptr + off |
875 | + offsetof(struct ip6t_entry, counters), | |
876 | &counters[num], | |
877 | sizeof(counters[num])) != 0) { | |
878 | ret = -EFAULT; | |
879 | goto free_counters; | |
880 | } | |
881 | ||
882 | for (i = sizeof(struct ip6t_entry); | |
883 | i < e->target_offset; | |
884 | i += m->u.match_size) { | |
885 | m = (void *)e + i; | |
886 | ||
e47ddb2c | 887 | if (xt_match_to_user(m, userptr + off + i)) { |
1da177e4 LT |
888 | ret = -EFAULT; |
889 | goto free_counters; | |
890 | } | |
891 | } | |
892 | ||
d5d1baa1 | 893 | t = ip6t_get_target_c(e); |
e47ddb2c | 894 | if (xt_target_to_user(t, userptr + off + e->target_offset)) { |
1da177e4 LT |
895 | ret = -EFAULT; |
896 | goto free_counters; | |
897 | } | |
898 | } | |
899 | ||
900 | free_counters: | |
901 | vfree(counters); | |
902 | return ret; | |
903 | } | |
904 | ||
47a6959f | 905 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
739674fb | 906 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
907 | { |
908 | int v = *(compat_int_t *)src; | |
909 | ||
910 | if (v > 0) | |
911 | v += xt_compat_calc_jump(AF_INET6, v); | |
912 | memcpy(dst, &v, sizeof(v)); | |
913 | } | |
914 | ||
739674fb | 915 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
916 | { |
917 | compat_int_t cv = *(int *)src; | |
918 | ||
919 | if (cv > 0) | |
920 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
921 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
922 | } | |
923 | ||
d5d1baa1 | 924 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 925 | const struct xt_table_info *info, |
d5d1baa1 | 926 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 927 | { |
dcea992a | 928 | const struct xt_entry_match *ematch; |
87a2e70d | 929 | const struct xt_entry_target *t; |
3bc3fe5e PM |
930 | unsigned int entry_offset; |
931 | int off, i, ret; | |
932 | ||
933 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
934 | entry_offset = (void *)e - base; | |
dcea992a | 935 | xt_ematch_foreach(ematch, e) |
6bdb331b | 936 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 937 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
938 | off += xt_compat_target_offset(t->u.kernel.target); |
939 | newinfo->size -= off; | |
940 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
941 | if (ret) | |
942 | return ret; | |
943 | ||
944 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
945 | if (info->hook_entry[i] && | |
946 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
947 | newinfo->hook_entry[i] -= off; | |
948 | if (info->underflow[i] && | |
949 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
950 | newinfo->underflow[i] -= off; | |
951 | } | |
952 | return 0; | |
953 | } | |
954 | ||
955 | static int compat_table_info(const struct xt_table_info *info, | |
956 | struct xt_table_info *newinfo) | |
957 | { | |
72b2b1dd | 958 | struct ip6t_entry *iter; |
711bdde6 | 959 | const void *loc_cpu_entry; |
0559518b | 960 | int ret; |
3bc3fe5e PM |
961 | |
962 | if (!newinfo || !info) | |
963 | return -EINVAL; | |
964 | ||
482cfc31 | 965 | /* we dont care about newinfo->entries */ |
3bc3fe5e PM |
966 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
967 | newinfo->initial_entries = 0; | |
482cfc31 | 968 | loc_cpu_entry = info->entries; |
9782a11e FW |
969 | ret = xt_compat_init_offsets(AF_INET6, info->number); |
970 | if (ret) | |
971 | return ret; | |
72b2b1dd JE |
972 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
973 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
974 | if (ret != 0) | |
0559518b | 975 | return ret; |
72b2b1dd | 976 | } |
0559518b | 977 | return 0; |
3bc3fe5e PM |
978 | } |
979 | #endif | |
980 | ||
f415e76f | 981 | static int get_info(struct net *net, void __user *user, const int *len) |
433665c9 | 982 | { |
12b00c2c | 983 | char name[XT_TABLE_MAXNAMELEN]; |
433665c9 PM |
984 | struct xt_table *t; |
985 | int ret; | |
986 | ||
d7cdf816 | 987 | if (*len != sizeof(struct ip6t_getinfo)) |
433665c9 | 988 | return -EINVAL; |
433665c9 PM |
989 | |
990 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
991 | return -EFAULT; | |
992 | ||
12b00c2c | 993 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
47a6959f | 994 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
f415e76f | 995 | if (in_compat_syscall()) |
3bc3fe5e PM |
996 | xt_compat_lock(AF_INET6); |
997 | #endif | |
03d13b68 FW |
998 | t = xt_request_find_table_lock(net, AF_INET6, name); |
999 | if (!IS_ERR(t)) { | |
433665c9 | 1000 | struct ip6t_getinfo info; |
d3d40f23 | 1001 | const struct xt_table_info *private = t->private; |
47a6959f | 1002 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
14c7dbe0 AD |
1003 | struct xt_table_info tmp; |
1004 | ||
f415e76f | 1005 | if (in_compat_syscall()) { |
3bc3fe5e PM |
1006 | ret = compat_table_info(private, &tmp); |
1007 | xt_compat_flush_offsets(AF_INET6); | |
1008 | private = &tmp; | |
1009 | } | |
1010 | #endif | |
cccbe5ef | 1011 | memset(&info, 0, sizeof(info)); |
433665c9 PM |
1012 | info.valid_hooks = t->valid_hooks; |
1013 | memcpy(info.hook_entry, private->hook_entry, | |
1014 | sizeof(info.hook_entry)); | |
1015 | memcpy(info.underflow, private->underflow, | |
1016 | sizeof(info.underflow)); | |
1017 | info.num_entries = private->number; | |
1018 | info.size = private->size; | |
b5dd674b | 1019 | strcpy(info.name, name); |
433665c9 PM |
1020 | |
1021 | if (copy_to_user(user, &info, *len) != 0) | |
1022 | ret = -EFAULT; | |
1023 | else | |
1024 | ret = 0; | |
1025 | ||
1026 | xt_table_unlock(t); | |
1027 | module_put(t->me); | |
1028 | } else | |
03d13b68 | 1029 | ret = PTR_ERR(t); |
47a6959f | 1030 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
f415e76f | 1031 | if (in_compat_syscall()) |
3bc3fe5e PM |
1032 | xt_compat_unlock(AF_INET6); |
1033 | #endif | |
433665c9 PM |
1034 | return ret; |
1035 | } | |
1036 | ||
1da177e4 | 1037 | static int |
d5d1baa1 | 1038 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
cda219c6 | 1039 | const int *len) |
1da177e4 LT |
1040 | { |
1041 | int ret; | |
d924357c | 1042 | struct ip6t_get_entries get; |
2e4e6a17 | 1043 | struct xt_table *t; |
1da177e4 | 1044 | |
d7cdf816 | 1045 | if (*len < sizeof(get)) |
d924357c | 1046 | return -EINVAL; |
d924357c PM |
1047 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1048 | return -EFAULT; | |
d7cdf816 | 1049 | if (*len != sizeof(struct ip6t_get_entries) + get.size) |
d924357c | 1050 | return -EINVAL; |
d7cdf816 | 1051 | |
b301f253 | 1052 | get.name[sizeof(get.name) - 1] = '\0'; |
d924357c | 1053 | |
336b517f | 1054 | t = xt_find_table_lock(net, AF_INET6, get.name); |
03d13b68 | 1055 | if (!IS_ERR(t)) { |
d3d40f23 | 1056 | struct xt_table_info *private = t->private; |
d924357c | 1057 | if (get.size == private->size) |
2e4e6a17 | 1058 | ret = copy_entries_to_user(private->size, |
1da177e4 | 1059 | t, uptr->entrytable); |
d7cdf816 | 1060 | else |
544473c1 | 1061 | ret = -EAGAIN; |
d7cdf816 | 1062 | |
6b7d31fc | 1063 | module_put(t->me); |
2e4e6a17 | 1064 | xt_table_unlock(t); |
1da177e4 | 1065 | } else |
03d13b68 | 1066 | ret = PTR_ERR(t); |
1da177e4 LT |
1067 | |
1068 | return ret; | |
1069 | } | |
1070 | ||
1071 | static int | |
336b517f | 1072 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1073 | struct xt_table_info *newinfo, unsigned int num_counters, |
1074 | void __user *counters_ptr) | |
1da177e4 LT |
1075 | { |
1076 | int ret; | |
2e4e6a17 | 1077 | struct xt_table *t; |
3bc3fe5e | 1078 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1079 | struct xt_counters *counters; |
72b2b1dd | 1080 | struct ip6t_entry *iter; |
1da177e4 | 1081 | |
3bc3fe5e | 1082 | ret = 0; |
c84ca954 | 1083 | counters = xt_counters_alloc(num_counters); |
1da177e4 LT |
1084 | if (!counters) { |
1085 | ret = -ENOMEM; | |
3bc3fe5e | 1086 | goto out; |
1da177e4 | 1087 | } |
1da177e4 | 1088 | |
03d13b68 FW |
1089 | t = xt_request_find_table_lock(net, AF_INET6, name); |
1090 | if (IS_ERR(t)) { | |
1091 | ret = PTR_ERR(t); | |
1da177e4 | 1092 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1093 | } |
1da177e4 LT |
1094 | |
1095 | /* You lied! */ | |
3bc3fe5e | 1096 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1097 | ret = -EINVAL; |
6b7d31fc | 1098 | goto put_module; |
1da177e4 LT |
1099 | } |
1100 | ||
3bc3fe5e | 1101 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1102 | if (!oldinfo) |
1103 | goto put_module; | |
1104 | ||
1105 | /* Update module usage count based on number of rules */ | |
1ab1457c YH |
1106 | if ((oldinfo->number > oldinfo->initial_entries) || |
1107 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1108 | module_put(t->me); |
1109 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1110 | (newinfo->number <= oldinfo->initial_entries)) | |
1111 | module_put(t->me); | |
1112 | ||
f31e5f1a XL |
1113 | xt_table_unlock(t); |
1114 | ||
d13e7b2e | 1115 | get_old_counters(oldinfo, counters); |
942e4a2b | 1116 | |
1da177e4 | 1117 | /* Decrease module usage counts and free resource */ |
482cfc31 | 1118 | xt_entry_foreach(iter, oldinfo->entries, oldinfo->size) |
0559518b | 1119 | cleanup_entry(iter, net); |
72b2b1dd | 1120 | |
2e4e6a17 | 1121 | xt_free_table_info(oldinfo); |
3bc3fe5e | 1122 | if (copy_to_user(counters_ptr, counters, |
c58dd2dd TG |
1123 | sizeof(struct xt_counters) * num_counters) != 0) { |
1124 | /* Silent error, can't fail, new table is already in place */ | |
1125 | net_warn_ratelimited("ip6tables: counters copy to user failed while replacing table\n"); | |
1126 | } | |
1da177e4 | 1127 | vfree(counters); |
1da177e4 LT |
1128 | return ret; |
1129 | ||
1130 | put_module: | |
1131 | module_put(t->me); | |
2e4e6a17 | 1132 | xt_table_unlock(t); |
1da177e4 | 1133 | free_newinfo_counters_untrans: |
1da177e4 | 1134 | vfree(counters); |
3bc3fe5e PM |
1135 | out: |
1136 | return ret; | |
1137 | } | |
1138 | ||
1139 | static int | |
c2f12630 | 1140 | do_replace(struct net *net, sockptr_t arg, unsigned int len) |
3bc3fe5e PM |
1141 | { |
1142 | int ret; | |
1143 | struct ip6t_replace tmp; | |
1144 | struct xt_table_info *newinfo; | |
1145 | void *loc_cpu_entry; | |
72b2b1dd | 1146 | struct ip6t_entry *iter; |
3bc3fe5e | 1147 | |
c2f12630 | 1148 | if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0) |
3bc3fe5e PM |
1149 | return -EFAULT; |
1150 | ||
1151 | /* overflow check */ | |
1152 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1153 | return -ENOMEM; | |
1086bbe9 DJ |
1154 | if (tmp.num_counters == 0) |
1155 | return -EINVAL; | |
1156 | ||
6a8ab060 | 1157 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1158 | |
1159 | newinfo = xt_alloc_table_info(tmp.size); | |
1160 | if (!newinfo) | |
1161 | return -ENOMEM; | |
1162 | ||
482cfc31 | 1163 | loc_cpu_entry = newinfo->entries; |
d3c48151 CH |
1164 | if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp), |
1165 | tmp.size) != 0) { | |
3bc3fe5e PM |
1166 | ret = -EFAULT; |
1167 | goto free_newinfo; | |
1168 | } | |
1169 | ||
0f234214 | 1170 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1171 | if (ret != 0) |
1172 | goto free_newinfo; | |
1173 | ||
336b517f | 1174 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1175 | tmp.num_counters, tmp.counters); |
1176 | if (ret) | |
1177 | goto free_newinfo_untrans; | |
1178 | return 0; | |
1179 | ||
1180 | free_newinfo_untrans: | |
72b2b1dd | 1181 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1182 | cleanup_entry(iter, net); |
1da177e4 | 1183 | free_newinfo: |
2e4e6a17 | 1184 | xt_free_table_info(newinfo); |
1da177e4 LT |
1185 | return ret; |
1186 | } | |
1187 | ||
1da177e4 | 1188 | static int |
ab214d1b | 1189 | do_add_counters(struct net *net, sockptr_t arg, unsigned int len) |
1da177e4 | 1190 | { |
482cfc31 | 1191 | unsigned int i; |
3bc3fe5e PM |
1192 | struct xt_counters_info tmp; |
1193 | struct xt_counters *paddc; | |
2e4e6a17 | 1194 | struct xt_table *t; |
5452e425 | 1195 | const struct xt_table_info *private; |
6b7d31fc | 1196 | int ret = 0; |
72b2b1dd | 1197 | struct ip6t_entry *iter; |
7f5c6d4f | 1198 | unsigned int addend; |
1da177e4 | 1199 | |
ab214d1b | 1200 | paddc = xt_copy_counters(arg, len, &tmp); |
d7591f0c FW |
1201 | if (IS_ERR(paddc)) |
1202 | return PTR_ERR(paddc); | |
1203 | t = xt_find_table_lock(net, AF_INET6, tmp.name); | |
03d13b68 FW |
1204 | if (IS_ERR(t)) { |
1205 | ret = PTR_ERR(t); | |
1da177e4 | 1206 | goto free; |
6b7d31fc | 1207 | } |
1da177e4 | 1208 | |
942e4a2b | 1209 | local_bh_disable(); |
d3d40f23 | 1210 | private = t->private; |
d7591f0c | 1211 | if (private->number != tmp.num_counters) { |
1da177e4 LT |
1212 | ret = -EINVAL; |
1213 | goto unlock_up_free; | |
1214 | } | |
1215 | ||
1216 | i = 0; | |
7f5c6d4f | 1217 | addend = xt_write_recseq_begin(); |
482cfc31 | 1218 | xt_entry_foreach(iter, private->entries, private->size) { |
71ae0dff FW |
1219 | struct xt_counters *tmp; |
1220 | ||
1221 | tmp = xt_get_this_cpu_counter(&iter->counters); | |
1222 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); | |
0559518b JE |
1223 | ++i; |
1224 | } | |
7f5c6d4f | 1225 | xt_write_recseq_end(addend); |
1da177e4 | 1226 | unlock_up_free: |
942e4a2b | 1227 | local_bh_enable(); |
2e4e6a17 | 1228 | xt_table_unlock(t); |
6b7d31fc | 1229 | module_put(t->me); |
1da177e4 LT |
1230 | free: |
1231 | vfree(paddc); | |
1232 | ||
1233 | return ret; | |
1234 | } | |
1235 | ||
47a6959f | 1236 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
3bc3fe5e | 1237 | struct compat_ip6t_replace { |
12b00c2c | 1238 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1239 | u32 valid_hooks; |
1240 | u32 num_entries; | |
1241 | u32 size; | |
1242 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1243 | u32 underflow[NF_INET_NUMHOOKS]; | |
1244 | u32 num_counters; | |
87a2e70d | 1245 | compat_uptr_t counters; /* struct xt_counters * */ |
6daf1414 | 1246 | struct compat_ip6t_entry entries[]; |
3bc3fe5e PM |
1247 | }; |
1248 | ||
1249 | static int | |
1250 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1251 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1252 | unsigned int i) |
3bc3fe5e | 1253 | { |
87a2e70d | 1254 | struct xt_entry_target *t; |
3bc3fe5e PM |
1255 | struct compat_ip6t_entry __user *ce; |
1256 | u_int16_t target_offset, next_offset; | |
1257 | compat_uint_t origsize; | |
dcea992a JE |
1258 | const struct xt_entry_match *ematch; |
1259 | int ret = 0; | |
3bc3fe5e | 1260 | |
3bc3fe5e | 1261 | origsize = *size; |
68ad546a | 1262 | ce = *dstptr; |
0559518b JE |
1263 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1264 | copy_to_user(&ce->counters, &counters[i], | |
1265 | sizeof(counters[i])) != 0) | |
1266 | return -EFAULT; | |
3bc3fe5e PM |
1267 | |
1268 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1269 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1270 | ||
dcea992a JE |
1271 | xt_ematch_foreach(ematch, e) { |
1272 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1273 | if (ret != 0) | |
6bdb331b | 1274 | return ret; |
dcea992a | 1275 | } |
3bc3fe5e | 1276 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1277 | t = ip6t_get_target(e); |
1278 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1279 | if (ret) | |
0559518b | 1280 | return ret; |
3bc3fe5e | 1281 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1282 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1283 | put_user(next_offset, &ce->next_offset) != 0) | |
1284 | return -EFAULT; | |
3bc3fe5e | 1285 | return 0; |
3bc3fe5e PM |
1286 | } |
1287 | ||
022748a9 | 1288 | static int |
87a2e70d | 1289 | compat_find_calc_match(struct xt_entry_match *m, |
3bc3fe5e | 1290 | const struct ip6t_ip6 *ipv6, |
6bdb331b | 1291 | int *size) |
3bc3fe5e PM |
1292 | { |
1293 | struct xt_match *match; | |
1294 | ||
fd0ec0e6 JE |
1295 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
1296 | m->u.user.revision); | |
d7cdf816 | 1297 | if (IS_ERR(match)) |
fd0ec0e6 | 1298 | return PTR_ERR(match); |
d7cdf816 | 1299 | |
3bc3fe5e PM |
1300 | m->u.kernel.match = match; |
1301 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1302 | return 0; |
1303 | } | |
1304 | ||
0559518b | 1305 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e | 1306 | { |
87a2e70d | 1307 | struct xt_entry_target *t; |
dcea992a | 1308 | struct xt_entry_match *ematch; |
3bc3fe5e | 1309 | |
3bc3fe5e | 1310 | /* Cleanup all matches */ |
dcea992a | 1311 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1312 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1313 | t = compat_ip6t_get_target(e); |
1314 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1315 | } |
1316 | ||
022748a9 | 1317 | static int |
3bc3fe5e PM |
1318 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1319 | struct xt_table_info *newinfo, | |
1320 | unsigned int *size, | |
d5d1baa1 | 1321 | const unsigned char *base, |
09d96860 | 1322 | const unsigned char *limit) |
3bc3fe5e | 1323 | { |
dcea992a | 1324 | struct xt_entry_match *ematch; |
87a2e70d | 1325 | struct xt_entry_target *t; |
3bc3fe5e PM |
1326 | struct xt_target *target; |
1327 | unsigned int entry_offset; | |
b0a6363c | 1328 | unsigned int j; |
09d96860 | 1329 | int ret, off; |
3bc3fe5e | 1330 | |
3666ed1c | 1331 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
6e94e0cf | 1332 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit || |
d7cdf816 | 1333 | (unsigned char *)e + e->next_offset > limit) |
3bc3fe5e | 1334 | return -EINVAL; |
3bc3fe5e PM |
1335 | |
1336 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
d7cdf816 | 1337 | sizeof(struct compat_xt_entry_target)) |
3bc3fe5e | 1338 | return -EINVAL; |
3bc3fe5e | 1339 | |
aa412ba2 FW |
1340 | if (!ip6_checkentry(&e->ipv6)) |
1341 | return -EINVAL; | |
1342 | ||
ce683e5f | 1343 | ret = xt_compat_check_entry_offsets(e, e->elems, |
fc1221b3 | 1344 | e->target_offset, e->next_offset); |
3bc3fe5e PM |
1345 | if (ret) |
1346 | return ret; | |
1347 | ||
1348 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1349 | entry_offset = (void *)e - (void *)base; | |
1350 | j = 0; | |
dcea992a | 1351 | xt_ematch_foreach(ematch, e) { |
329a0807 | 1352 | ret = compat_find_calc_match(ematch, &e->ipv6, &off); |
dcea992a | 1353 | if (ret != 0) |
6bdb331b JE |
1354 | goto release_matches; |
1355 | ++j; | |
dcea992a | 1356 | } |
3bc3fe5e PM |
1357 | |
1358 | t = compat_ip6t_get_target(e); | |
d2a7b6ba JE |
1359 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
1360 | t->u.user.revision); | |
1361 | if (IS_ERR(target)) { | |
d2a7b6ba | 1362 | ret = PTR_ERR(target); |
3bc3fe5e PM |
1363 | goto release_matches; |
1364 | } | |
1365 | t->u.kernel.target = target; | |
1366 | ||
1367 | off += xt_compat_target_offset(target); | |
1368 | *size += off; | |
1369 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1370 | if (ret) | |
1371 | goto out; | |
1372 | ||
3bc3fe5e PM |
1373 | return 0; |
1374 | ||
1375 | out: | |
1376 | module_put(t->u.kernel.target->me); | |
1377 | release_matches: | |
6bdb331b JE |
1378 | xt_ematch_foreach(ematch, e) { |
1379 | if (j-- == 0) | |
dcea992a | 1380 | break; |
6bdb331b JE |
1381 | module_put(ematch->u.kernel.match->me); |
1382 | } | |
3bc3fe5e PM |
1383 | return ret; |
1384 | } | |
1385 | ||
0188346f | 1386 | static void |
3bc3fe5e | 1387 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, |
329a0807 | 1388 | unsigned int *size, |
3bc3fe5e PM |
1389 | struct xt_table_info *newinfo, unsigned char *base) |
1390 | { | |
87a2e70d | 1391 | struct xt_entry_target *t; |
3bc3fe5e PM |
1392 | struct ip6t_entry *de; |
1393 | unsigned int origsize; | |
0188346f | 1394 | int h; |
dcea992a | 1395 | struct xt_entry_match *ematch; |
3bc3fe5e | 1396 | |
3bc3fe5e | 1397 | origsize = *size; |
68ad546a | 1398 | de = *dstptr; |
3bc3fe5e PM |
1399 | memcpy(de, e, sizeof(struct ip6t_entry)); |
1400 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1401 | ||
1402 | *dstptr += sizeof(struct ip6t_entry); | |
1403 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1404 | ||
0188346f FW |
1405 | xt_ematch_foreach(ematch, e) |
1406 | xt_compat_match_from_user(ematch, dstptr, size); | |
1407 | ||
3bc3fe5e PM |
1408 | de->target_offset = e->target_offset - (origsize - *size); |
1409 | t = compat_ip6t_get_target(e); | |
3bc3fe5e PM |
1410 | xt_compat_target_from_user(t, dstptr, size); |
1411 | ||
1412 | de->next_offset = e->next_offset - (origsize - *size); | |
1413 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1414 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1415 | newinfo->hook_entry[h] -= origsize - *size; | |
1416 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1417 | newinfo->underflow[h] -= origsize - *size; | |
1418 | } | |
3bc3fe5e PM |
1419 | } |
1420 | ||
3bc3fe5e | 1421 | static int |
f54e9367 | 1422 | translate_compat_table(struct net *net, |
3bc3fe5e PM |
1423 | struct xt_table_info **pinfo, |
1424 | void **pentry0, | |
329a0807 | 1425 | const struct compat_ip6t_replace *compatr) |
3bc3fe5e PM |
1426 | { |
1427 | unsigned int i, j; | |
1428 | struct xt_table_info *newinfo, *info; | |
1429 | void *pos, *entry0, *entry1; | |
72b2b1dd | 1430 | struct compat_ip6t_entry *iter0; |
09d96860 | 1431 | struct ip6t_replace repl; |
3bc3fe5e | 1432 | unsigned int size; |
9782a11e | 1433 | int ret; |
3bc3fe5e PM |
1434 | |
1435 | info = *pinfo; | |
1436 | entry0 = *pentry0; | |
329a0807 FW |
1437 | size = compatr->size; |
1438 | info->number = compatr->num_entries; | |
3bc3fe5e | 1439 | |
3bc3fe5e PM |
1440 | j = 0; |
1441 | xt_compat_lock(AF_INET6); | |
9782a11e FW |
1442 | ret = xt_compat_init_offsets(AF_INET6, compatr->num_entries); |
1443 | if (ret) | |
1444 | goto out_unlock; | |
3bc3fe5e | 1445 | /* Walk through entries, checking offsets. */ |
329a0807 | 1446 | xt_entry_foreach(iter0, entry0, compatr->size) { |
72b2b1dd | 1447 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
6b4ff2d7 | 1448 | entry0, |
09d96860 | 1449 | entry0 + compatr->size); |
72b2b1dd | 1450 | if (ret != 0) |
0559518b JE |
1451 | goto out_unlock; |
1452 | ++j; | |
72b2b1dd | 1453 | } |
3bc3fe5e PM |
1454 | |
1455 | ret = -EINVAL; | |
d7cdf816 | 1456 | if (j != compatr->num_entries) |
3bc3fe5e | 1457 | goto out_unlock; |
3bc3fe5e | 1458 | |
3bc3fe5e PM |
1459 | ret = -ENOMEM; |
1460 | newinfo = xt_alloc_table_info(size); | |
1461 | if (!newinfo) | |
1462 | goto out_unlock; | |
1463 | ||
b29c457a FW |
1464 | memset(newinfo->entries, 0, size); |
1465 | ||
329a0807 | 1466 | newinfo->number = compatr->num_entries; |
3bc3fe5e | 1467 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
09d96860 FW |
1468 | newinfo->hook_entry[i] = compatr->hook_entry[i]; |
1469 | newinfo->underflow[i] = compatr->underflow[i]; | |
3bc3fe5e | 1470 | } |
482cfc31 | 1471 | entry1 = newinfo->entries; |
3bc3fe5e | 1472 | pos = entry1; |
09d96860 | 1473 | size = compatr->size; |
0188346f FW |
1474 | xt_entry_foreach(iter0, entry0, compatr->size) |
1475 | compat_copy_entry_from_user(iter0, &pos, &size, | |
1476 | newinfo, entry1); | |
1477 | ||
09d96860 | 1478 | /* all module references in entry0 are now gone. */ |
3bc3fe5e PM |
1479 | xt_compat_flush_offsets(AF_INET6); |
1480 | xt_compat_unlock(AF_INET6); | |
3bc3fe5e | 1481 | |
09d96860 | 1482 | memcpy(&repl, compatr, sizeof(*compatr)); |
3bc3fe5e | 1483 | |
09d96860 FW |
1484 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1485 | repl.hook_entry[i] = newinfo->hook_entry[i]; | |
1486 | repl.underflow[i] = newinfo->underflow[i]; | |
3bc3fe5e PM |
1487 | } |
1488 | ||
09d96860 FW |
1489 | repl.num_counters = 0; |
1490 | repl.counters = NULL; | |
1491 | repl.size = newinfo->size; | |
1492 | ret = translate_table(net, newinfo, entry1, &repl); | |
1493 | if (ret) | |
1494 | goto free_newinfo; | |
1495 | ||
3bc3fe5e PM |
1496 | *pinfo = newinfo; |
1497 | *pentry0 = entry1; | |
1498 | xt_free_table_info(info); | |
1499 | return 0; | |
1500 | ||
1501 | free_newinfo: | |
1502 | xt_free_table_info(newinfo); | |
09d96860 FW |
1503 | return ret; |
1504 | out_unlock: | |
1505 | xt_compat_flush_offsets(AF_INET6); | |
1506 | xt_compat_unlock(AF_INET6); | |
329a0807 | 1507 | xt_entry_foreach(iter0, entry0, compatr->size) { |
0559518b | 1508 | if (j-- == 0) |
72b2b1dd | 1509 | break; |
0559518b JE |
1510 | compat_release_entry(iter0); |
1511 | } | |
3bc3fe5e | 1512 | return ret; |
3bc3fe5e PM |
1513 | } |
1514 | ||
1515 | static int | |
c2f12630 | 1516 | compat_do_replace(struct net *net, sockptr_t arg, unsigned int len) |
3bc3fe5e PM |
1517 | { |
1518 | int ret; | |
1519 | struct compat_ip6t_replace tmp; | |
1520 | struct xt_table_info *newinfo; | |
1521 | void *loc_cpu_entry; | |
72b2b1dd | 1522 | struct ip6t_entry *iter; |
3bc3fe5e | 1523 | |
c2f12630 | 1524 | if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0) |
3bc3fe5e PM |
1525 | return -EFAULT; |
1526 | ||
1527 | /* overflow check */ | |
3bc3fe5e PM |
1528 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1529 | return -ENOMEM; | |
1086bbe9 DJ |
1530 | if (tmp.num_counters == 0) |
1531 | return -EINVAL; | |
1532 | ||
6a8ab060 | 1533 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1534 | |
1535 | newinfo = xt_alloc_table_info(tmp.size); | |
1536 | if (!newinfo) | |
1537 | return -ENOMEM; | |
1538 | ||
482cfc31 | 1539 | loc_cpu_entry = newinfo->entries; |
d3c48151 CH |
1540 | if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp), |
1541 | tmp.size) != 0) { | |
3bc3fe5e PM |
1542 | ret = -EFAULT; |
1543 | goto free_newinfo; | |
1544 | } | |
1545 | ||
329a0807 | 1546 | ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1547 | if (ret != 0) |
1548 | goto free_newinfo; | |
1549 | ||
336b517f | 1550 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1551 | tmp.num_counters, compat_ptr(tmp.counters)); |
1552 | if (ret) | |
1553 | goto free_newinfo_untrans; | |
1554 | return 0; | |
1555 | ||
1556 | free_newinfo_untrans: | |
72b2b1dd | 1557 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1558 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1559 | free_newinfo: |
1560 | xt_free_table_info(newinfo); | |
1561 | return ret; | |
1562 | } | |
1563 | ||
3bc3fe5e | 1564 | struct compat_ip6t_get_entries { |
12b00c2c | 1565 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e | 1566 | compat_uint_t size; |
6daf1414 | 1567 | struct compat_ip6t_entry entrytable[]; |
3bc3fe5e PM |
1568 | }; |
1569 | ||
1570 | static int | |
1571 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1572 | void __user *userptr) | |
1573 | { | |
1574 | struct xt_counters *counters; | |
d3d40f23 | 1575 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1576 | void __user *pos; |
1577 | unsigned int size; | |
1578 | int ret = 0; | |
3bc3fe5e | 1579 | unsigned int i = 0; |
72b2b1dd | 1580 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1581 | |
1582 | counters = alloc_counters(table); | |
1583 | if (IS_ERR(counters)) | |
1584 | return PTR_ERR(counters); | |
1585 | ||
3bc3fe5e PM |
1586 | pos = userptr; |
1587 | size = total_size; | |
482cfc31 | 1588 | xt_entry_foreach(iter, private->entries, total_size) { |
72b2b1dd | 1589 | ret = compat_copy_entry_to_user(iter, &pos, |
6b4ff2d7 | 1590 | &size, counters, i++); |
72b2b1dd JE |
1591 | if (ret != 0) |
1592 | break; | |
1593 | } | |
3bc3fe5e PM |
1594 | |
1595 | vfree(counters); | |
1596 | return ret; | |
1597 | } | |
1598 | ||
1599 | static int | |
336b517f AD |
1600 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1601 | int *len) | |
3bc3fe5e PM |
1602 | { |
1603 | int ret; | |
1604 | struct compat_ip6t_get_entries get; | |
1605 | struct xt_table *t; | |
1606 | ||
d7cdf816 | 1607 | if (*len < sizeof(get)) |
3bc3fe5e | 1608 | return -EINVAL; |
3bc3fe5e PM |
1609 | |
1610 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1611 | return -EFAULT; | |
1612 | ||
d7cdf816 | 1613 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) |
3bc3fe5e | 1614 | return -EINVAL; |
d7cdf816 | 1615 | |
b301f253 | 1616 | get.name[sizeof(get.name) - 1] = '\0'; |
3bc3fe5e PM |
1617 | |
1618 | xt_compat_lock(AF_INET6); | |
336b517f | 1619 | t = xt_find_table_lock(net, AF_INET6, get.name); |
03d13b68 | 1620 | if (!IS_ERR(t)) { |
abe7034b | 1621 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1622 | struct xt_table_info info; |
3bc3fe5e | 1623 | ret = compat_table_info(private, &info); |
d7cdf816 | 1624 | if (!ret && get.size == info.size) |
3bc3fe5e PM |
1625 | ret = compat_copy_entries_to_user(private->size, |
1626 | t, uptr->entrytable); | |
d7cdf816 | 1627 | else if (!ret) |
544473c1 | 1628 | ret = -EAGAIN; |
d7cdf816 | 1629 | |
3bc3fe5e PM |
1630 | xt_compat_flush_offsets(AF_INET6); |
1631 | module_put(t->me); | |
1632 | xt_table_unlock(t); | |
1633 | } else | |
03d13b68 | 1634 | ret = PTR_ERR(t); |
3bc3fe5e PM |
1635 | |
1636 | xt_compat_unlock(AF_INET6); | |
1637 | return ret; | |
1638 | } | |
3bc3fe5e PM |
1639 | #endif |
1640 | ||
1da177e4 | 1641 | static int |
c2f12630 | 1642 | do_ip6t_set_ctl(struct sock *sk, int cmd, sockptr_t arg, unsigned int len) |
1da177e4 LT |
1643 | { |
1644 | int ret; | |
1645 | ||
af31f412 | 1646 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1647 | return -EPERM; |
1648 | ||
1649 | switch (cmd) { | |
1650 | case IP6T_SO_SET_REPLACE: | |
47a6959f | 1651 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
f415e76f | 1652 | if (in_compat_syscall()) |
c2f12630 | 1653 | ret = compat_do_replace(sock_net(sk), arg, len); |
f415e76f CH |
1654 | else |
1655 | #endif | |
c2f12630 | 1656 | ret = do_replace(sock_net(sk), arg, len); |
1da177e4 LT |
1657 | break; |
1658 | ||
1659 | case IP6T_SO_SET_ADD_COUNTERS: | |
c2f12630 | 1660 | ret = do_add_counters(sock_net(sk), arg, len); |
1da177e4 LT |
1661 | break; |
1662 | ||
1663 | default: | |
1da177e4 LT |
1664 | ret = -EINVAL; |
1665 | } | |
1666 | ||
1667 | return ret; | |
1668 | } | |
1669 | ||
1670 | static int | |
1671 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1672 | { | |
1673 | int ret; | |
1674 | ||
af31f412 | 1675 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1676 | return -EPERM; |
1677 | ||
1678 | switch (cmd) { | |
433665c9 | 1679 | case IP6T_SO_GET_INFO: |
f415e76f | 1680 | ret = get_info(sock_net(sk), user, len); |
433665c9 | 1681 | break; |
1da177e4 | 1682 | |
d924357c | 1683 | case IP6T_SO_GET_ENTRIES: |
47a6959f | 1684 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
f415e76f CH |
1685 | if (in_compat_syscall()) |
1686 | ret = compat_get_entries(sock_net(sk), user, len); | |
1687 | else | |
1688 | #endif | |
1689 | ret = get_entries(sock_net(sk), user, len); | |
1da177e4 | 1690 | break; |
1da177e4 | 1691 | |
6b7d31fc HW |
1692 | case IP6T_SO_GET_REVISION_MATCH: |
1693 | case IP6T_SO_GET_REVISION_TARGET: { | |
12b00c2c | 1694 | struct xt_get_revision rev; |
2e4e6a17 | 1695 | int target; |
6b7d31fc HW |
1696 | |
1697 | if (*len != sizeof(rev)) { | |
1698 | ret = -EINVAL; | |
1699 | break; | |
1700 | } | |
1701 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1702 | ret = -EFAULT; | |
1703 | break; | |
1704 | } | |
6a8ab060 | 1705 | rev.name[sizeof(rev.name)-1] = 0; |
6b7d31fc HW |
1706 | |
1707 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 1708 | target = 1; |
6b7d31fc | 1709 | else |
2e4e6a17 | 1710 | target = 0; |
6b7d31fc | 1711 | |
2e4e6a17 HW |
1712 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
1713 | rev.revision, | |
1714 | target, &ret), | |
6b7d31fc HW |
1715 | "ip6t_%s", rev.name); |
1716 | break; | |
1717 | } | |
1718 | ||
1da177e4 | 1719 | default: |
1da177e4 LT |
1720 | ret = -EINVAL; |
1721 | } | |
1722 | ||
1723 | return ret; | |
1724 | } | |
1725 | ||
b9e69e12 FW |
1726 | static void __ip6t_unregister_table(struct net *net, struct xt_table *table) |
1727 | { | |
1728 | struct xt_table_info *private; | |
1729 | void *loc_cpu_entry; | |
1730 | struct module *table_owner = table->me; | |
1731 | struct ip6t_entry *iter; | |
1732 | ||
1733 | private = xt_unregister_table(table); | |
1734 | ||
1735 | /* Decrease module usage counts and free resources */ | |
1736 | loc_cpu_entry = private->entries; | |
1737 | xt_entry_foreach(iter, loc_cpu_entry, private->size) | |
1738 | cleanup_entry(iter, net); | |
1739 | if (private->number > private->initial_entries) | |
1740 | module_put(table_owner); | |
1741 | xt_free_table_info(private); | |
1742 | } | |
1743 | ||
a67dd266 FW |
1744 | int ip6t_register_table(struct net *net, const struct xt_table *table, |
1745 | const struct ip6t_replace *repl, | |
ee177a54 | 1746 | const struct nf_hook_ops *template_ops) |
1da177e4 | 1747 | { |
ee177a54 FW |
1748 | struct nf_hook_ops *ops; |
1749 | unsigned int num_ops; | |
1750 | int ret, i; | |
2e4e6a17 | 1751 | struct xt_table_info *newinfo; |
f3c5c1bf | 1752 | struct xt_table_info bootstrap = {0}; |
31836064 | 1753 | void *loc_cpu_entry; |
a98da11d | 1754 | struct xt_table *new_table; |
1da177e4 | 1755 | |
2e4e6a17 | 1756 | newinfo = xt_alloc_table_info(repl->size); |
a67dd266 FW |
1757 | if (!newinfo) |
1758 | return -ENOMEM; | |
1da177e4 | 1759 | |
482cfc31 | 1760 | loc_cpu_entry = newinfo->entries; |
31836064 | 1761 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
1da177e4 | 1762 | |
0f234214 | 1763 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
ee177a54 FW |
1764 | if (ret != 0) { |
1765 | xt_free_table_info(newinfo); | |
1766 | return ret; | |
1767 | } | |
1da177e4 | 1768 | |
336b517f | 1769 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 1770 | if (IS_ERR(new_table)) { |
ee177a54 FW |
1771 | xt_free_table_info(newinfo); |
1772 | return PTR_ERR(new_table); | |
1da177e4 | 1773 | } |
a67dd266 | 1774 | |
ee177a54 | 1775 | if (!template_ops) |
ba7d284a | 1776 | return 0; |
b9e69e12 | 1777 | |
ee177a54 FW |
1778 | num_ops = hweight32(table->valid_hooks); |
1779 | if (num_ops == 0) { | |
1780 | ret = -EINVAL; | |
1781 | goto out_free; | |
b9e69e12 FW |
1782 | } |
1783 | ||
ee177a54 FW |
1784 | ops = kmemdup(template_ops, sizeof(*ops) * num_ops, GFP_KERNEL); |
1785 | if (!ops) { | |
1786 | ret = -ENOMEM; | |
1787 | goto out_free; | |
1788 | } | |
1789 | ||
1790 | for (i = 0; i < num_ops; i++) | |
1791 | ops[i].priv = new_table; | |
1792 | ||
1793 | new_table->ops = ops; | |
1794 | ||
1795 | ret = nf_register_net_hooks(net, ops, num_ops); | |
1796 | if (ret != 0) | |
1797 | goto out_free; | |
1798 | ||
a67dd266 | 1799 | return ret; |
1da177e4 | 1800 | |
44d34e72 | 1801 | out_free: |
ee177a54 | 1802 | __ip6t_unregister_table(net, new_table); |
a67dd266 | 1803 | return ret; |
1da177e4 LT |
1804 | } |
1805 | ||
ee177a54 | 1806 | void ip6t_unregister_table_pre_exit(struct net *net, const char *name) |
57ea5f18 | 1807 | { |
6c071754 FW |
1808 | struct xt_table *table = xt_find_table(net, NFPROTO_IPV6, name); |
1809 | ||
1810 | if (table) | |
ee177a54 | 1811 | nf_unregister_net_hooks(net, table->ops, hweight32(table->valid_hooks)); |
57ea5f18 DW |
1812 | } |
1813 | ||
6c071754 | 1814 | void ip6t_unregister_table_exit(struct net *net, const char *name) |
57ea5f18 | 1815 | { |
6c071754 FW |
1816 | struct xt_table *table = xt_find_table(net, NFPROTO_IPV6, name); |
1817 | ||
1818 | if (table) | |
1819 | __ip6t_unregister_table(net, table); | |
57ea5f18 DW |
1820 | } |
1821 | ||
1da177e4 | 1822 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ |
ccb79bdc | 1823 | static inline bool |
1da177e4 LT |
1824 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
1825 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 1826 | bool invert) |
1da177e4 LT |
1827 | { |
1828 | return (type == test_type && code >= min_code && code <= max_code) | |
1829 | ^ invert; | |
1830 | } | |
1831 | ||
1d93a9cb | 1832 | static bool |
62fc8051 | 1833 | icmp6_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 1834 | { |
5452e425 JE |
1835 | const struct icmp6hdr *ic; |
1836 | struct icmp6hdr _icmph; | |
f7108a20 | 1837 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
1838 | |
1839 | /* Must not be a fragment. */ | |
f7108a20 | 1840 | if (par->fragoff != 0) |
1d93a9cb | 1841 | return false; |
1da177e4 | 1842 | |
f7108a20 | 1843 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
1844 | if (ic == NULL) { |
1845 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
1846 | * can't. Hence, no choice but to drop. |
1847 | */ | |
b4ba2611 | 1848 | par->hotdrop = true; |
1d93a9cb | 1849 | return false; |
1da177e4 LT |
1850 | } |
1851 | ||
1852 | return icmp6_type_code_match(icmpinfo->type, | |
1853 | icmpinfo->code[0], | |
1854 | icmpinfo->code[1], | |
1855 | ic->icmp6_type, ic->icmp6_code, | |
1856 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
1857 | } | |
1858 | ||
1859 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 1860 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 1861 | { |
9b4fce7a | 1862 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 1863 | |
7f939713 | 1864 | /* Must specify no unknown invflags */ |
bd414ee6 | 1865 | return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
1866 | } |
1867 | ||
1868 | /* The built-in targets: standard (NULL) and error. */ | |
4538506b JE |
1869 | static struct xt_target ip6t_builtin_tg[] __read_mostly = { |
1870 | { | |
243bf6e2 | 1871 | .name = XT_STANDARD_TARGET, |
4538506b JE |
1872 | .targetsize = sizeof(int), |
1873 | .family = NFPROTO_IPV6, | |
47a6959f | 1874 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
4538506b JE |
1875 | .compatsize = sizeof(compat_int_t), |
1876 | .compat_from_user = compat_standard_from_user, | |
1877 | .compat_to_user = compat_standard_to_user, | |
3bc3fe5e | 1878 | #endif |
4538506b JE |
1879 | }, |
1880 | { | |
243bf6e2 | 1881 | .name = XT_ERROR_TARGET, |
4538506b | 1882 | .target = ip6t_error, |
12b00c2c | 1883 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
1884 | .family = NFPROTO_IPV6, |
1885 | }, | |
1da177e4 LT |
1886 | }; |
1887 | ||
1888 | static struct nf_sockopt_ops ip6t_sockopts = { | |
1889 | .pf = PF_INET6, | |
1890 | .set_optmin = IP6T_BASE_CTL, | |
1891 | .set_optmax = IP6T_SO_SET_MAX+1, | |
1892 | .set = do_ip6t_set_ctl, | |
1893 | .get_optmin = IP6T_BASE_CTL, | |
1894 | .get_optmax = IP6T_SO_GET_MAX+1, | |
1895 | .get = do_ip6t_get_ctl, | |
16fcec35 | 1896 | .owner = THIS_MODULE, |
1da177e4 LT |
1897 | }; |
1898 | ||
4538506b JE |
1899 | static struct xt_match ip6t_builtin_mt[] __read_mostly = { |
1900 | { | |
1901 | .name = "icmp6", | |
1902 | .match = icmp6_match, | |
1903 | .matchsize = sizeof(struct ip6t_icmp), | |
1904 | .checkentry = icmp6_checkentry, | |
1905 | .proto = IPPROTO_ICMPV6, | |
1906 | .family = NFPROTO_IPV6, | |
d376bef9 | 1907 | .me = THIS_MODULE, |
4538506b | 1908 | }, |
1da177e4 LT |
1909 | }; |
1910 | ||
3cb609d5 AD |
1911 | static int __net_init ip6_tables_net_init(struct net *net) |
1912 | { | |
383ca5b8 | 1913 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
1914 | } |
1915 | ||
1916 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
1917 | { | |
383ca5b8 | 1918 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
1919 | } |
1920 | ||
1921 | static struct pernet_operations ip6_tables_net_ops = { | |
1922 | .init = ip6_tables_net_init, | |
1923 | .exit = ip6_tables_net_exit, | |
1924 | }; | |
1925 | ||
65b4b4e8 | 1926 | static int __init ip6_tables_init(void) |
1da177e4 LT |
1927 | { |
1928 | int ret; | |
1929 | ||
3cb609d5 | 1930 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
1931 | if (ret < 0) |
1932 | goto err1; | |
2e4e6a17 | 1933 | |
25985edc | 1934 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 1935 | ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 PM |
1936 | if (ret < 0) |
1937 | goto err2; | |
4538506b | 1938 | ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 PM |
1939 | if (ret < 0) |
1940 | goto err4; | |
1da177e4 LT |
1941 | |
1942 | /* Register setsockopt */ | |
1943 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
1944 | if (ret < 0) |
1945 | goto err5; | |
1da177e4 | 1946 | |
1da177e4 | 1947 | return 0; |
0eff66e6 PM |
1948 | |
1949 | err5: | |
4538506b | 1950 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 | 1951 | err4: |
4538506b | 1952 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 | 1953 | err2: |
3cb609d5 | 1954 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
1955 | err1: |
1956 | return ret; | |
1da177e4 LT |
1957 | } |
1958 | ||
65b4b4e8 | 1959 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
1960 | { |
1961 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 1962 | |
4538506b JE |
1963 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
1964 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); | |
3cb609d5 | 1965 | unregister_pernet_subsys(&ip6_tables_net_ops); |
1da177e4 LT |
1966 | } |
1967 | ||
1968 | EXPORT_SYMBOL(ip6t_register_table); | |
57ea5f18 DW |
1969 | EXPORT_SYMBOL(ip6t_unregister_table_pre_exit); |
1970 | EXPORT_SYMBOL(ip6t_unregister_table_exit); | |
1da177e4 | 1971 | EXPORT_SYMBOL(ip6t_do_table); |
1da177e4 | 1972 | |
65b4b4e8 AM |
1973 | module_init(ip6_tables_init); |
1974 | module_exit(ip6_tables_fini); |