Commit | Line | Data |
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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 <net/ipv6.h> |
3bc3fe5e | 22 | #include <net/compat.h> |
7c0f6ba6 | 23 | #include <linux/uaccess.h> |
57b47a53 | 24 | #include <linux/mutex.h> |
1da177e4 | 25 | #include <linux/proc_fs.h> |
3bc3fe5e | 26 | #include <linux/err.h> |
c8923c6b | 27 | #include <linux/cpumask.h> |
1da177e4 LT |
28 | |
29 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
2e4e6a17 | 30 | #include <linux/netfilter/x_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("IPv6 packet filter"); | |
37 | ||
e3eaa991 JE |
38 | void *ip6t_alloc_initial_table(const struct xt_table *info) |
39 | { | |
40 | return xt_alloc_initial_table(ip6t, IP6T); | |
41 | } | |
42 | EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table); | |
43 | ||
1da177e4 | 44 | /* Returns whether matches rule or not. */ |
022748a9 | 45 | /* Performance critical - called for every packet */ |
1d93a9cb | 46 | static inline bool |
1da177e4 LT |
47 | ip6_packet_match(const struct sk_buff *skb, |
48 | const char *indev, | |
49 | const char *outdev, | |
50 | const struct ip6t_ip6 *ip6info, | |
51 | unsigned int *protoff, | |
586d5a8b | 52 | u16 *fragoff, bool *hotdrop) |
1da177e4 | 53 | { |
1da177e4 | 54 | unsigned long ret; |
0660e03f | 55 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
1da177e4 | 56 | |
c37a2dfa JP |
57 | if (NF_INVF(ip6info, IP6T_INV_SRCIP, |
58 | ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, | |
59 | &ip6info->src)) || | |
60 | NF_INVF(ip6info, IP6T_INV_DSTIP, | |
61 | ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, | |
62 | &ip6info->dst))) | |
1d93a9cb | 63 | return false; |
1da177e4 | 64 | |
b8dfe498 | 65 | ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask); |
1da177e4 | 66 | |
c37a2dfa | 67 | if (NF_INVF(ip6info, IP6T_INV_VIA_IN, ret != 0)) |
1d93a9cb | 68 | return false; |
1da177e4 | 69 | |
b8dfe498 | 70 | ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask); |
1da177e4 | 71 | |
c37a2dfa | 72 | if (NF_INVF(ip6info, IP6T_INV_VIA_OUT, ret != 0)) |
1d93a9cb | 73 | return false; |
1da177e4 LT |
74 | |
75 | /* ... might want to do something with class and flowlabel here ... */ | |
76 | ||
77 | /* look for the desired protocol header */ | |
4305ae44 | 78 | if (ip6info->flags & IP6T_F_PROTO) { |
b777e0ce PM |
79 | int protohdr; |
80 | unsigned short _frag_off; | |
1da177e4 | 81 | |
84018f55 | 82 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off, NULL); |
51d8b1a6 PM |
83 | if (protohdr < 0) { |
84 | if (_frag_off == 0) | |
cff533ac | 85 | *hotdrop = true; |
1d93a9cb | 86 | return false; |
51d8b1a6 | 87 | } |
b777e0ce | 88 | *fragoff = _frag_off; |
1da177e4 | 89 | |
b777e0ce | 90 | if (ip6info->proto == protohdr) { |
4305ae44 | 91 | if (ip6info->invflags & IP6T_INV_PROTO) |
1d93a9cb | 92 | return false; |
4305ae44 | 93 | |
1d93a9cb | 94 | return true; |
1da177e4 LT |
95 | } |
96 | ||
97 | /* We need match for the '-p all', too! */ | |
98 | if ((ip6info->proto != 0) && | |
99 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
1d93a9cb | 100 | return false; |
1da177e4 | 101 | } |
1d93a9cb | 102 | return true; |
1da177e4 LT |
103 | } |
104 | ||
105 | /* should be ip6 safe */ | |
022748a9 | 106 | static bool |
1da177e4 LT |
107 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
108 | { | |
d7cdf816 | 109 | if (ipv6->flags & ~IP6T_F_MASK) |
ccb79bdc | 110 | return false; |
d7cdf816 | 111 | if (ipv6->invflags & ~IP6T_INV_MASK) |
ccb79bdc | 112 | return false; |
d7cdf816 | 113 | |
ccb79bdc | 114 | return true; |
1da177e4 LT |
115 | } |
116 | ||
117 | static unsigned int | |
4b560b44 | 118 | ip6t_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 119 | { |
e87cc472 | 120 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
121 | |
122 | return NF_DROP; | |
123 | } | |
124 | ||
1da177e4 | 125 | static inline struct ip6t_entry * |
d5d1baa1 | 126 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
127 | { |
128 | return (struct ip6t_entry *)(base + offset); | |
129 | } | |
130 | ||
ba9dda3a | 131 | /* All zeroes == unconditional rule. */ |
022748a9 | 132 | /* Mildly perf critical (only if packet tracing is on) */ |
54d83fc7 | 133 | static inline bool unconditional(const struct ip6t_entry *e) |
ba9dda3a | 134 | { |
47901dc2 | 135 | static const struct ip6t_ip6 uncond; |
ba9dda3a | 136 | |
54d83fc7 FW |
137 | return e->target_offset == sizeof(struct ip6t_entry) && |
138 | memcmp(&e->ipv6, &uncond, sizeof(uncond)) == 0; | |
ba9dda3a JK |
139 | } |
140 | ||
87a2e70d | 141 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
142 | ip6t_get_target_c(const struct ip6t_entry *e) |
143 | { | |
144 | return ip6t_get_target((struct ip6t_entry *)e); | |
145 | } | |
146 | ||
07a93626 | 147 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
ba9dda3a | 148 | /* This cries for unification! */ |
022748a9 | 149 | static const char *const hooknames[] = { |
6e23ae2a PM |
150 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
151 | [NF_INET_LOCAL_IN] = "INPUT", | |
152 | [NF_INET_FORWARD] = "FORWARD", | |
153 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
154 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
155 | }; |
156 | ||
157 | enum nf_ip_trace_comments { | |
158 | NF_IP6_TRACE_COMMENT_RULE, | |
159 | NF_IP6_TRACE_COMMENT_RETURN, | |
160 | NF_IP6_TRACE_COMMENT_POLICY, | |
161 | }; | |
162 | ||
022748a9 | 163 | static const char *const comments[] = { |
ba9dda3a JK |
164 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
165 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
166 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
167 | }; | |
168 | ||
549d2d41 | 169 | static const struct nf_loginfo trace_loginfo = { |
ba9dda3a JK |
170 | .type = NF_LOG_TYPE_LOG, |
171 | .u = { | |
172 | .log = { | |
a81b2ce8 | 173 | .level = LOGLEVEL_WARNING, |
ff107d27 | 174 | .logflags = NF_LOG_DEFAULT_MASK, |
ba9dda3a JK |
175 | }, |
176 | }, | |
177 | }; | |
178 | ||
022748a9 | 179 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 180 | static inline int |
d5d1baa1 | 181 | get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e, |
4f2f6f23 JE |
182 | const char *hookname, const char **chainname, |
183 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 184 | { |
87a2e70d | 185 | const struct xt_standard_target *t = (void *)ip6t_get_target_c(s); |
ba9dda3a | 186 | |
243bf6e2 | 187 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
188 | /* Head of user chain: ERROR target with chainname */ |
189 | *chainname = t->target.data; | |
190 | (*rulenum) = 0; | |
191 | } else if (s == e) { | |
192 | (*rulenum)++; | |
193 | ||
54d83fc7 | 194 | if (unconditional(s) && |
3666ed1c | 195 | strcmp(t->target.u.kernel.target->name, |
243bf6e2 | 196 | XT_STANDARD_TARGET) == 0 && |
54d83fc7 | 197 | t->verdict < 0) { |
ba9dda3a JK |
198 | /* Tail of chains: STANDARD target (return/policy) */ |
199 | *comment = *chainname == hookname | |
4f2f6f23 JE |
200 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
201 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
202 | } |
203 | return 1; | |
204 | } else | |
205 | (*rulenum)++; | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
9dff2c96 EB |
210 | static void trace_packet(struct net *net, |
211 | const struct sk_buff *skb, | |
ba9dda3a JK |
212 | unsigned int hook, |
213 | const struct net_device *in, | |
214 | const struct net_device *out, | |
ecb6f85e | 215 | const char *tablename, |
d5d1baa1 JE |
216 | const struct xt_table_info *private, |
217 | const struct ip6t_entry *e) | |
ba9dda3a | 218 | { |
5452e425 | 219 | const struct ip6t_entry *root; |
4f2f6f23 | 220 | const char *hookname, *chainname, *comment; |
72b2b1dd | 221 | const struct ip6t_entry *iter; |
ba9dda3a JK |
222 | unsigned int rulenum = 0; |
223 | ||
482cfc31 | 224 | root = get_entry(private->entries, private->hook_entry[hook]); |
ba9dda3a | 225 | |
4f2f6f23 JE |
226 | hookname = chainname = hooknames[hook]; |
227 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; | |
ba9dda3a | 228 | |
72b2b1dd JE |
229 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
230 | if (get_chainname_rulenum(iter, e, hookname, | |
231 | &chainname, &comment, &rulenum) != 0) | |
232 | break; | |
ba9dda3a | 233 | |
4017a7ee PNA |
234 | nf_log_trace(net, AF_INET6, hook, skb, in, out, &trace_loginfo, |
235 | "TRACE: %s:%s:%s:%u ", | |
236 | tablename, chainname, comment, rulenum); | |
ba9dda3a JK |
237 | } |
238 | #endif | |
239 | ||
6c7941de | 240 | static inline struct ip6t_entry * |
98e86403 JE |
241 | ip6t_next_entry(const struct ip6t_entry *entry) |
242 | { | |
243 | return (void *)entry + entry->next_offset; | |
244 | } | |
245 | ||
1da177e4 LT |
246 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
247 | unsigned int | |
44b5990e FW |
248 | ip6t_do_table(void *priv, struct sk_buff *skb, |
249 | const struct nf_hook_state *state) | |
1da177e4 | 250 | { |
44b5990e | 251 | const struct xt_table *table = priv; |
6cb8ff3f | 252 | unsigned int hook = state->hook; |
6b7d31fc | 253 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
254 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
255 | unsigned int verdict = NF_DROP; | |
256 | const char *indev, *outdev; | |
d5d1baa1 | 257 | const void *table_base; |
f3c5c1bf | 258 | struct ip6t_entry *e, **jumpstack; |
7814b6ec | 259 | unsigned int stackidx, cpu; |
d5d1baa1 | 260 | const struct xt_table_info *private; |
de74c169 | 261 | struct xt_action_param acpar; |
7f5c6d4f | 262 | unsigned int addend; |
1da177e4 LT |
263 | |
264 | /* Initialization */ | |
7814b6ec | 265 | stackidx = 0; |
8f8a3715 DM |
266 | indev = state->in ? state->in->name : nulldevname; |
267 | outdev = state->out ? state->out->name : nulldevname; | |
1da177e4 LT |
268 | /* We handle fragments by dealing with the first fragment as |
269 | * if it was a normal packet. All other fragments are treated | |
270 | * normally, except that they will NEVER match rules that ask | |
271 | * things we don't know, ie. tcp syn flag or ports). If the | |
272 | * rule is also a fragment-specific rule, non-fragments won't | |
273 | * match it. */ | |
310e2d43 | 274 | acpar.fragoff = 0; |
b4ba2611 | 275 | acpar.hotdrop = false; |
613dbd95 | 276 | acpar.state = state; |
1da177e4 | 277 | |
9efdb14f | 278 | WARN_ON(!(table->valid_hooks & (1 << hook))); |
78454473 | 279 | |
7f5c6d4f ED |
280 | local_bh_disable(); |
281 | addend = xt_write_recseq_begin(); | |
d3d40f23 | 282 | private = READ_ONCE(table->private); /* Address dependency. */ |
f3c5c1bf | 283 | cpu = smp_processor_id(); |
482cfc31 | 284 | table_base = private->entries; |
f3c5c1bf | 285 | jumpstack = (struct ip6t_entry **)private->jumpstack[cpu]; |
7814b6ec FW |
286 | |
287 | /* Switch to alternate jumpstack if we're being invoked via TEE. | |
288 | * TEE issues XT_CONTINUE verdict on original skb so we must not | |
289 | * clobber the jumpstack. | |
290 | * | |
291 | * For recursion via REJECT or SYNPROXY the stack will be clobbered | |
292 | * but it is no problem since absolute verdict is issued by these. | |
293 | */ | |
dcebd315 FW |
294 | if (static_key_false(&xt_tee_enabled)) |
295 | jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated); | |
78454473 | 296 | |
2e4e6a17 | 297 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 298 | |
1da177e4 | 299 | do { |
87a2e70d | 300 | const struct xt_entry_target *t; |
dcea992a | 301 | const struct xt_entry_match *ematch; |
71ae0dff | 302 | struct xt_counters *counter; |
a1ff4ac8 | 303 | |
9efdb14f | 304 | WARN_ON(!e); |
84018f55 | 305 | acpar.thoff = 0; |
a1ff4ac8 | 306 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
b4ba2611 | 307 | &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) { |
dcea992a | 308 | no_match: |
a1ff4ac8 JE |
309 | e = ip6t_next_entry(e); |
310 | continue; | |
311 | } | |
1da177e4 | 312 | |
ef53d702 | 313 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
314 | acpar.match = ematch->u.kernel.match; |
315 | acpar.matchinfo = ematch->data; | |
316 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 317 | goto no_match; |
ef53d702 | 318 | } |
dcea992a | 319 | |
71ae0dff FW |
320 | counter = xt_get_this_cpu_counter(&e->counters); |
321 | ADD_COUNTER(*counter, skb->len, 1); | |
1da177e4 | 322 | |
d5d1baa1 | 323 | t = ip6t_get_target_c(e); |
9efdb14f | 324 | WARN_ON(!t->u.kernel.target); |
ba9dda3a | 325 | |
07a93626 | 326 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
327 | /* The packet is traced: log it */ |
328 | if (unlikely(skb->nf_trace)) | |
9dff2c96 EB |
329 | trace_packet(state->net, skb, hook, state->in, |
330 | state->out, table->name, private, e); | |
ba9dda3a | 331 | #endif |
a1ff4ac8 JE |
332 | /* Standard target? */ |
333 | if (!t->u.kernel.target->target) { | |
334 | int v; | |
335 | ||
87a2e70d | 336 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
337 | if (v < 0) { |
338 | /* Pop from stack? */ | |
243bf6e2 | 339 | if (v != XT_RETURN) { |
95c96174 | 340 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 341 | break; |
1da177e4 | 342 | } |
7814b6ec | 343 | if (stackidx == 0) |
f3c5c1bf JE |
344 | e = get_entry(table_base, |
345 | private->underflow[hook]); | |
346 | else | |
7814b6ec | 347 | e = ip6t_next_entry(jumpstack[--stackidx]); |
a1ff4ac8 JE |
348 | continue; |
349 | } | |
3666ed1c JP |
350 | if (table_base + v != ip6t_next_entry(e) && |
351 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
57ebd808 FW |
352 | if (unlikely(stackidx >= private->stacksize)) { |
353 | verdict = NF_DROP; | |
354 | break; | |
355 | } | |
7814b6ec | 356 | jumpstack[stackidx++] = e; |
a1ff4ac8 | 357 | } |
1da177e4 | 358 | |
a1ff4ac8 | 359 | e = get_entry(table_base, v); |
7a6b1c46 JE |
360 | continue; |
361 | } | |
362 | ||
de74c169 JE |
363 | acpar.target = t->u.kernel.target; |
364 | acpar.targinfo = t->data; | |
7eb35586 | 365 | |
de74c169 | 366 | verdict = t->u.kernel.target->target(skb, &acpar); |
243bf6e2 | 367 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
368 | e = ip6t_next_entry(e); |
369 | else | |
370 | /* Verdict */ | |
371 | break; | |
b4ba2611 | 372 | } while (!acpar.hotdrop); |
1da177e4 | 373 | |
7695495d IM |
374 | xt_write_recseq_end(addend); |
375 | local_bh_enable(); | |
1da177e4 | 376 | |
b4ba2611 | 377 | if (acpar.hotdrop) |
1da177e4 LT |
378 | return NF_DROP; |
379 | else return verdict; | |
1da177e4 LT |
380 | } |
381 | ||
1da177e4 | 382 | /* Figures out from what hook each rule can be called: returns 0 if |
98dbbfc3 | 383 | there are loops. Puts hook bitmask in comefrom. */ |
1da177e4 | 384 | static int |
98dbbfc3 | 385 | mark_source_chains(const struct xt_table_info *newinfo, |
f4dc7771 FW |
386 | unsigned int valid_hooks, void *entry0, |
387 | unsigned int *offsets) | |
1da177e4 LT |
388 | { |
389 | unsigned int hook; | |
390 | ||
391 | /* No recursion; use packet counter to save back ptrs (reset | |
392 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 393 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 394 | unsigned int pos = newinfo->hook_entry[hook]; |
68ad546a | 395 | struct ip6t_entry *e = entry0 + pos; |
1da177e4 LT |
396 | |
397 | if (!(valid_hooks & (1 << hook))) | |
398 | continue; | |
399 | ||
400 | /* Set initial back pointer. */ | |
401 | e->counters.pcnt = pos; | |
402 | ||
403 | for (;;) { | |
87a2e70d | 404 | const struct xt_standard_target *t |
d5d1baa1 | 405 | = (void *)ip6t_get_target_c(e); |
9c547959 | 406 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 407 | |
d7cdf816 | 408 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) |
1da177e4 | 409 | return 0; |
d7cdf816 | 410 | |
9c547959 | 411 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
412 | |
413 | /* Unconditional return/END. */ | |
54d83fc7 | 414 | if ((unconditional(e) && |
3666ed1c | 415 | (strcmp(t->target.u.user.name, |
243bf6e2 | 416 | XT_STANDARD_TARGET) == 0) && |
54d83fc7 | 417 | t->verdict < 0) || visited) { |
1da177e4 LT |
418 | unsigned int oldpos, size; |
419 | ||
420 | /* Return: backtrack through the last | |
421 | big jump. */ | |
422 | do { | |
6e23ae2a | 423 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
424 | oldpos = pos; |
425 | pos = e->counters.pcnt; | |
426 | e->counters.pcnt = 0; | |
427 | ||
428 | /* We're at the start. */ | |
429 | if (pos == oldpos) | |
430 | goto next; | |
431 | ||
68ad546a | 432 | e = entry0 + pos; |
1da177e4 LT |
433 | } while (oldpos == pos + e->next_offset); |
434 | ||
435 | /* Move along one */ | |
436 | size = e->next_offset; | |
68ad546a | 437 | e = entry0 + pos + size; |
f24e230d FW |
438 | if (pos + size >= newinfo->size) |
439 | return 0; | |
1da177e4 LT |
440 | e->counters.pcnt = pos; |
441 | pos += size; | |
442 | } else { | |
443 | int newpos = t->verdict; | |
444 | ||
445 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 446 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 447 | newpos >= 0) { |
1da177e4 | 448 | /* This a jump; chase it. */ |
f4dc7771 FW |
449 | if (!xt_find_jump_offset(offsets, newpos, |
450 | newinfo->number)) | |
451 | return 0; | |
1da177e4 LT |
452 | } else { |
453 | /* ... this is a fallthru */ | |
454 | newpos = pos + e->next_offset; | |
f24e230d FW |
455 | if (newpos >= newinfo->size) |
456 | return 0; | |
1da177e4 | 457 | } |
68ad546a | 458 | e = entry0 + newpos; |
1da177e4 LT |
459 | e->counters.pcnt = pos; |
460 | pos = newpos; | |
461 | } | |
462 | } | |
d7cdf816 | 463 | next: ; |
1da177e4 LT |
464 | } |
465 | return 1; | |
466 | } | |
467 | ||
87a2e70d | 468 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 469 | { |
6be3d859 JE |
470 | struct xt_mtdtor_param par; |
471 | ||
f54e9367 | 472 | par.net = net; |
6be3d859 JE |
473 | par.match = m->u.kernel.match; |
474 | par.matchinfo = m->data; | |
916a917d | 475 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
476 | if (par.match->destroy != NULL) |
477 | par.match->destroy(&par); | |
478 | module_put(par.match->me); | |
1da177e4 LT |
479 | } |
480 | ||
87a2e70d | 481 | static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
f173c8a1 | 482 | { |
9b4fce7a | 483 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 | 484 | |
9b4fce7a JE |
485 | par->match = m->u.kernel.match; |
486 | par->matchinfo = m->data; | |
487 | ||
d7cdf816 PNA |
488 | return xt_check_match(par, m->u.match_size - sizeof(*m), |
489 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); | |
f173c8a1 PM |
490 | } |
491 | ||
022748a9 | 492 | static int |
87a2e70d | 493 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 494 | { |
6709dbbb | 495 | struct xt_match *match; |
3cdc7c95 | 496 | int ret; |
1da177e4 | 497 | |
fd0ec0e6 JE |
498 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
499 | m->u.user.revision); | |
d7cdf816 | 500 | if (IS_ERR(match)) |
fd0ec0e6 | 501 | return PTR_ERR(match); |
d7cdf816 | 502 | |
1da177e4 | 503 | m->u.kernel.match = match; |
1da177e4 | 504 | |
6bdb331b | 505 | ret = check_match(m, par); |
3cdc7c95 PM |
506 | if (ret) |
507 | goto err; | |
508 | ||
1da177e4 | 509 | return 0; |
3cdc7c95 PM |
510 | err: |
511 | module_put(m->u.kernel.match->me); | |
512 | return ret; | |
1da177e4 LT |
513 | } |
514 | ||
add67461 | 515 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 516 | { |
87a2e70d | 517 | struct xt_entry_target *t = ip6t_get_target(e); |
af5d6dc2 | 518 | struct xt_tgchk_param par = { |
add67461 | 519 | .net = net, |
af5d6dc2 JE |
520 | .table = name, |
521 | .entryinfo = e, | |
522 | .target = t->u.kernel.target, | |
523 | .targinfo = t->data, | |
524 | .hook_mask = e->comefrom, | |
916a917d | 525 | .family = NFPROTO_IPV6, |
af5d6dc2 | 526 | }; |
1da177e4 | 527 | |
d7cdf816 PNA |
528 | return xt_check_target(&par, t->u.target_size - sizeof(*t), |
529 | e->ipv6.proto, | |
530 | e->ipv6.invflags & IP6T_INV_PROTO); | |
f173c8a1 | 531 | } |
1da177e4 | 532 | |
022748a9 | 533 | static int |
a83d8e8d | 534 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
ae0ac0ed FW |
535 | unsigned int size, |
536 | struct xt_percpu_counter_alloc_state *alloc_state) | |
f173c8a1 | 537 | { |
87a2e70d | 538 | struct xt_entry_target *t; |
f173c8a1 PM |
539 | struct xt_target *target; |
540 | int ret; | |
541 | unsigned int j; | |
9b4fce7a | 542 | struct xt_mtchk_param mtpar; |
dcea992a | 543 | struct xt_entry_match *ematch; |
f173c8a1 | 544 | |
ae0ac0ed | 545 | if (!xt_percpu_counter_alloc(alloc_state, &e->counters)) |
71ae0dff FW |
546 | return -ENOMEM; |
547 | ||
1da177e4 | 548 | j = 0; |
c568503e | 549 | memset(&mtpar, 0, sizeof(mtpar)); |
a83d8e8d | 550 | mtpar.net = net; |
9b4fce7a JE |
551 | mtpar.table = name; |
552 | mtpar.entryinfo = &e->ipv6; | |
553 | mtpar.hook_mask = e->comefrom; | |
916a917d | 554 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 555 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 556 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 557 | if (ret != 0) |
6bdb331b JE |
558 | goto cleanup_matches; |
559 | ++j; | |
dcea992a | 560 | } |
1da177e4 LT |
561 | |
562 | t = ip6t_get_target(e); | |
d2a7b6ba JE |
563 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
564 | t->u.user.revision); | |
565 | if (IS_ERR(target)) { | |
d2a7b6ba | 566 | ret = PTR_ERR(target); |
1da177e4 LT |
567 | goto cleanup_matches; |
568 | } | |
569 | t->u.kernel.target = target; | |
6b7d31fc | 570 | |
add67461 | 571 | ret = check_target(e, net, name); |
3cdc7c95 PM |
572 | if (ret) |
573 | goto err; | |
1da177e4 | 574 | return 0; |
3cdc7c95 PM |
575 | err: |
576 | module_put(t->u.kernel.target->me); | |
1da177e4 | 577 | cleanup_matches: |
6bdb331b JE |
578 | xt_ematch_foreach(ematch, e) { |
579 | if (j-- == 0) | |
dcea992a | 580 | break; |
6bdb331b JE |
581 | cleanup_match(ematch, net); |
582 | } | |
71ae0dff | 583 | |
4d31eef5 | 584 | xt_percpu_counter_free(&e->counters); |
71ae0dff | 585 | |
1da177e4 LT |
586 | return ret; |
587 | } | |
588 | ||
d5d1baa1 | 589 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 | 590 | { |
87a2e70d | 591 | const struct xt_entry_target *t; |
e2fe35c1 JE |
592 | unsigned int verdict; |
593 | ||
54d83fc7 | 594 | if (!unconditional(e)) |
e2fe35c1 | 595 | return false; |
d5d1baa1 | 596 | t = ip6t_get_target_c(e); |
e2fe35c1 JE |
597 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
598 | return false; | |
87a2e70d | 599 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
600 | verdict = -verdict - 1; |
601 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
602 | } | |
603 | ||
022748a9 | 604 | static int |
1da177e4 | 605 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 606 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
607 | const unsigned char *base, |
608 | const unsigned char *limit, | |
1da177e4 LT |
609 | const unsigned int *hook_entries, |
610 | const unsigned int *underflows, | |
0559518b | 611 | unsigned int valid_hooks) |
1da177e4 LT |
612 | { |
613 | unsigned int h; | |
bdf533de | 614 | int err; |
1da177e4 | 615 | |
3666ed1c | 616 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
6e94e0cf | 617 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit || |
d7cdf816 | 618 | (unsigned char *)e + e->next_offset > limit) |
1da177e4 | 619 | return -EINVAL; |
1da177e4 LT |
620 | |
621 | if (e->next_offset | |
d7cdf816 | 622 | < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) |
1da177e4 | 623 | return -EINVAL; |
1da177e4 | 624 | |
aa412ba2 FW |
625 | if (!ip6_checkentry(&e->ipv6)) |
626 | return -EINVAL; | |
627 | ||
ce683e5f FW |
628 | err = xt_check_entry_offsets(e, e->elems, e->target_offset, |
629 | e->next_offset); | |
bdf533de FW |
630 | if (err) |
631 | return err; | |
632 | ||
1da177e4 | 633 | /* Check hooks & underflows */ |
6e23ae2a | 634 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
635 | if (!(valid_hooks & (1 << h))) |
636 | continue; | |
1da177e4 LT |
637 | if ((unsigned char *)e - base == hook_entries[h]) |
638 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 639 | if ((unsigned char *)e - base == underflows[h]) { |
d7cdf816 | 640 | if (!check_underflow(e)) |
90e7d4ab | 641 | return -EINVAL; |
d7cdf816 | 642 | |
1da177e4 | 643 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 644 | } |
1da177e4 LT |
645 | } |
646 | ||
1da177e4 | 647 | /* Clear counters and comefrom */ |
2e4e6a17 | 648 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 649 | e->comefrom = 0; |
1da177e4 LT |
650 | return 0; |
651 | } | |
652 | ||
0559518b | 653 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
1da177e4 | 654 | { |
a2df1648 | 655 | struct xt_tgdtor_param par; |
87a2e70d | 656 | struct xt_entry_target *t; |
dcea992a | 657 | struct xt_entry_match *ematch; |
1da177e4 | 658 | |
1da177e4 | 659 | /* Cleanup all matches */ |
dcea992a | 660 | xt_ematch_foreach(ematch, e) |
6bdb331b | 661 | cleanup_match(ematch, net); |
1da177e4 | 662 | t = ip6t_get_target(e); |
a2df1648 | 663 | |
add67461 | 664 | par.net = net; |
a2df1648 JE |
665 | par.target = t->u.kernel.target; |
666 | par.targinfo = t->data; | |
916a917d | 667 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
668 | if (par.target->destroy != NULL) |
669 | par.target->destroy(&par); | |
670 | module_put(par.target->me); | |
4d31eef5 | 671 | xt_percpu_counter_free(&e->counters); |
1da177e4 LT |
672 | } |
673 | ||
674 | /* Checks and translates the user-supplied table segment (held in | |
675 | newinfo) */ | |
676 | static int | |
0f234214 | 677 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
cda219c6 | 678 | const struct ip6t_replace *repl) |
1da177e4 | 679 | { |
ae0ac0ed | 680 | struct xt_percpu_counter_alloc_state alloc_state = { 0 }; |
72b2b1dd | 681 | struct ip6t_entry *iter; |
f4dc7771 | 682 | unsigned int *offsets; |
1da177e4 | 683 | unsigned int i; |
72b2b1dd | 684 | int ret = 0; |
1da177e4 | 685 | |
0f234214 JE |
686 | newinfo->size = repl->size; |
687 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
688 | |
689 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 690 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
691 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
692 | newinfo->underflow[i] = 0xFFFFFFFF; | |
693 | } | |
694 | ||
f4dc7771 FW |
695 | offsets = xt_alloc_entry_offsets(newinfo->number); |
696 | if (!offsets) | |
697 | return -ENOMEM; | |
1da177e4 LT |
698 | i = 0; |
699 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
700 | xt_entry_foreach(iter, entry0, newinfo->size) { |
701 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
702 | entry0 + repl->size, |
703 | repl->hook_entry, | |
704 | repl->underflow, | |
705 | repl->valid_hooks); | |
72b2b1dd | 706 | if (ret != 0) |
f4dc7771 FW |
707 | goto out_free; |
708 | if (i < repl->num_entries) | |
709 | offsets[i] = (void *)iter - entry0; | |
0559518b | 710 | ++i; |
98dbbfc3 FW |
711 | if (strcmp(ip6t_get_target(iter)->u.user.name, |
712 | XT_ERROR_TARGET) == 0) | |
713 | ++newinfo->stacksize; | |
72b2b1dd | 714 | } |
1da177e4 | 715 | |
f4dc7771 | 716 | ret = -EINVAL; |
d7cdf816 | 717 | if (i != repl->num_entries) |
f4dc7771 | 718 | goto out_free; |
1da177e4 | 719 | |
1b293e30 FW |
720 | ret = xt_check_table_hooks(newinfo, repl->valid_hooks); |
721 | if (ret) | |
722 | goto out_free; | |
1da177e4 | 723 | |
f4dc7771 FW |
724 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) { |
725 | ret = -ELOOP; | |
726 | goto out_free; | |
727 | } | |
728 | kvfree(offsets); | |
74c9c0c1 | 729 | |
1da177e4 LT |
730 | /* Finally, each sanity check must pass */ |
731 | i = 0; | |
72b2b1dd | 732 | xt_entry_foreach(iter, entry0, newinfo->size) { |
ae0ac0ed FW |
733 | ret = find_check_entry(iter, net, repl->name, repl->size, |
734 | &alloc_state); | |
72b2b1dd JE |
735 | if (ret != 0) |
736 | break; | |
0559518b | 737 | ++i; |
72b2b1dd | 738 | } |
1da177e4 | 739 | |
74c9c0c1 | 740 | if (ret != 0) { |
0559518b JE |
741 | xt_entry_foreach(iter, entry0, newinfo->size) { |
742 | if (i-- == 0) | |
72b2b1dd | 743 | break; |
0559518b JE |
744 | cleanup_entry(iter, net); |
745 | } | |
74c9c0c1 DM |
746 | return ret; |
747 | } | |
1da177e4 | 748 | |
f4dc7771 FW |
749 | return ret; |
750 | out_free: | |
751 | kvfree(offsets); | |
9c547959 | 752 | return ret; |
1da177e4 LT |
753 | } |
754 | ||
1da177e4 | 755 | static void |
2e4e6a17 HW |
756 | get_counters(const struct xt_table_info *t, |
757 | struct xt_counters counters[]) | |
1da177e4 | 758 | { |
72b2b1dd | 759 | struct ip6t_entry *iter; |
1da177e4 LT |
760 | unsigned int cpu; |
761 | unsigned int i; | |
762 | ||
6f912042 | 763 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 764 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 765 | |
1da177e4 | 766 | i = 0; |
482cfc31 | 767 | xt_entry_foreach(iter, t->entries, t->size) { |
71ae0dff | 768 | struct xt_counters *tmp; |
83723d60 ED |
769 | u64 bcnt, pcnt; |
770 | unsigned int start; | |
771 | ||
71ae0dff | 772 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
83723d60 | 773 | do { |
7f5c6d4f | 774 | start = read_seqcount_begin(s); |
71ae0dff FW |
775 | bcnt = tmp->bcnt; |
776 | pcnt = tmp->pcnt; | |
7f5c6d4f | 777 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
778 | |
779 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b | 780 | ++i; |
a5d7a714 | 781 | cond_resched(); |
0559518b | 782 | } |
1da177e4 | 783 | } |
78454473 SH |
784 | } |
785 | ||
d13e7b2e FW |
786 | static void get_old_counters(const struct xt_table_info *t, |
787 | struct xt_counters counters[]) | |
788 | { | |
789 | struct ip6t_entry *iter; | |
790 | unsigned int cpu, i; | |
791 | ||
792 | for_each_possible_cpu(cpu) { | |
793 | i = 0; | |
794 | xt_entry_foreach(iter, t->entries, t->size) { | |
795 | const struct xt_counters *tmp; | |
796 | ||
797 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); | |
798 | ADD_COUNTER(counters[i], tmp->bcnt, tmp->pcnt); | |
799 | ++i; | |
800 | } | |
801 | cond_resched(); | |
802 | } | |
803 | } | |
804 | ||
d5d1baa1 | 805 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 806 | { |
ed1a6f5e | 807 | unsigned int countersize; |
2e4e6a17 | 808 | struct xt_counters *counters; |
d3d40f23 | 809 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
810 | |
811 | /* We need atomic snapshot of counters: rest doesn't change | |
812 | (other than comefrom, which userspace doesn't care | |
813 | about). */ | |
2e4e6a17 | 814 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 815 | counters = vzalloc(countersize); |
1da177e4 LT |
816 | |
817 | if (counters == NULL) | |
942e4a2b | 818 | return ERR_PTR(-ENOMEM); |
78454473 | 819 | |
942e4a2b | 820 | get_counters(private, counters); |
78454473 | 821 | |
49a88d18 | 822 | return counters; |
ed1a6f5e PM |
823 | } |
824 | ||
825 | static int | |
826 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 827 | const struct xt_table *table, |
ed1a6f5e PM |
828 | void __user *userptr) |
829 | { | |
830 | unsigned int off, num; | |
d5d1baa1 | 831 | const struct ip6t_entry *e; |
ed1a6f5e | 832 | struct xt_counters *counters; |
d3d40f23 | 833 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 834 | int ret = 0; |
711bdde6 | 835 | const void *loc_cpu_entry; |
ed1a6f5e PM |
836 | |
837 | counters = alloc_counters(table); | |
838 | if (IS_ERR(counters)) | |
839 | return PTR_ERR(counters); | |
840 | ||
482cfc31 | 841 | loc_cpu_entry = private->entries; |
1da177e4 LT |
842 | |
843 | /* FIXME: use iterator macros --RR */ | |
844 | /* ... then go back and fix counters and names */ | |
845 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
846 | unsigned int i; | |
87a2e70d JE |
847 | const struct xt_entry_match *m; |
848 | const struct xt_entry_target *t; | |
1da177e4 | 849 | |
68ad546a | 850 | e = loc_cpu_entry + off; |
e47ddb2c WB |
851 | if (copy_to_user(userptr + off, e, sizeof(*e))) { |
852 | ret = -EFAULT; | |
853 | goto free_counters; | |
854 | } | |
1da177e4 LT |
855 | if (copy_to_user(userptr + off |
856 | + offsetof(struct ip6t_entry, counters), | |
857 | &counters[num], | |
858 | sizeof(counters[num])) != 0) { | |
859 | ret = -EFAULT; | |
860 | goto free_counters; | |
861 | } | |
862 | ||
863 | for (i = sizeof(struct ip6t_entry); | |
864 | i < e->target_offset; | |
865 | i += m->u.match_size) { | |
866 | m = (void *)e + i; | |
867 | ||
e47ddb2c | 868 | if (xt_match_to_user(m, userptr + off + i)) { |
1da177e4 LT |
869 | ret = -EFAULT; |
870 | goto free_counters; | |
871 | } | |
872 | } | |
873 | ||
d5d1baa1 | 874 | t = ip6t_get_target_c(e); |
e47ddb2c | 875 | if (xt_target_to_user(t, userptr + off + e->target_offset)) { |
1da177e4 LT |
876 | ret = -EFAULT; |
877 | goto free_counters; | |
878 | } | |
879 | } | |
880 | ||
881 | free_counters: | |
882 | vfree(counters); | |
883 | return ret; | |
884 | } | |
885 | ||
47a6959f | 886 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
739674fb | 887 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
888 | { |
889 | int v = *(compat_int_t *)src; | |
890 | ||
891 | if (v > 0) | |
892 | v += xt_compat_calc_jump(AF_INET6, v); | |
893 | memcpy(dst, &v, sizeof(v)); | |
894 | } | |
895 | ||
739674fb | 896 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
897 | { |
898 | compat_int_t cv = *(int *)src; | |
899 | ||
900 | if (cv > 0) | |
901 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
902 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
903 | } | |
904 | ||
d5d1baa1 | 905 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 906 | const struct xt_table_info *info, |
d5d1baa1 | 907 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 908 | { |
dcea992a | 909 | const struct xt_entry_match *ematch; |
87a2e70d | 910 | const struct xt_entry_target *t; |
3bc3fe5e PM |
911 | unsigned int entry_offset; |
912 | int off, i, ret; | |
913 | ||
914 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
915 | entry_offset = (void *)e - base; | |
dcea992a | 916 | xt_ematch_foreach(ematch, e) |
6bdb331b | 917 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 918 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
919 | off += xt_compat_target_offset(t->u.kernel.target); |
920 | newinfo->size -= off; | |
921 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
922 | if (ret) | |
923 | return ret; | |
924 | ||
925 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
926 | if (info->hook_entry[i] && | |
927 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
928 | newinfo->hook_entry[i] -= off; | |
929 | if (info->underflow[i] && | |
930 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
931 | newinfo->underflow[i] -= off; | |
932 | } | |
933 | return 0; | |
934 | } | |
935 | ||
936 | static int compat_table_info(const struct xt_table_info *info, | |
937 | struct xt_table_info *newinfo) | |
938 | { | |
72b2b1dd | 939 | struct ip6t_entry *iter; |
711bdde6 | 940 | const void *loc_cpu_entry; |
0559518b | 941 | int ret; |
3bc3fe5e PM |
942 | |
943 | if (!newinfo || !info) | |
944 | return -EINVAL; | |
945 | ||
482cfc31 | 946 | /* we dont care about newinfo->entries */ |
3bc3fe5e PM |
947 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
948 | newinfo->initial_entries = 0; | |
482cfc31 | 949 | loc_cpu_entry = info->entries; |
9782a11e FW |
950 | ret = xt_compat_init_offsets(AF_INET6, info->number); |
951 | if (ret) | |
952 | return ret; | |
72b2b1dd JE |
953 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
954 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
955 | if (ret != 0) | |
0559518b | 956 | return ret; |
72b2b1dd | 957 | } |
0559518b | 958 | return 0; |
3bc3fe5e PM |
959 | } |
960 | #endif | |
961 | ||
f415e76f | 962 | static int get_info(struct net *net, void __user *user, const int *len) |
433665c9 | 963 | { |
12b00c2c | 964 | char name[XT_TABLE_MAXNAMELEN]; |
433665c9 PM |
965 | struct xt_table *t; |
966 | int ret; | |
967 | ||
d7cdf816 | 968 | if (*len != sizeof(struct ip6t_getinfo)) |
433665c9 | 969 | return -EINVAL; |
433665c9 PM |
970 | |
971 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
972 | return -EFAULT; | |
973 | ||
12b00c2c | 974 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
47a6959f | 975 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
f415e76f | 976 | if (in_compat_syscall()) |
3bc3fe5e PM |
977 | xt_compat_lock(AF_INET6); |
978 | #endif | |
03d13b68 FW |
979 | t = xt_request_find_table_lock(net, AF_INET6, name); |
980 | if (!IS_ERR(t)) { | |
433665c9 | 981 | struct ip6t_getinfo info; |
d3d40f23 | 982 | const struct xt_table_info *private = t->private; |
47a6959f | 983 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
14c7dbe0 AD |
984 | struct xt_table_info tmp; |
985 | ||
f415e76f | 986 | if (in_compat_syscall()) { |
3bc3fe5e PM |
987 | ret = compat_table_info(private, &tmp); |
988 | xt_compat_flush_offsets(AF_INET6); | |
989 | private = &tmp; | |
990 | } | |
991 | #endif | |
cccbe5ef | 992 | memset(&info, 0, sizeof(info)); |
433665c9 PM |
993 | info.valid_hooks = t->valid_hooks; |
994 | memcpy(info.hook_entry, private->hook_entry, | |
995 | sizeof(info.hook_entry)); | |
996 | memcpy(info.underflow, private->underflow, | |
997 | sizeof(info.underflow)); | |
998 | info.num_entries = private->number; | |
999 | info.size = private->size; | |
b5dd674b | 1000 | strcpy(info.name, name); |
433665c9 PM |
1001 | |
1002 | if (copy_to_user(user, &info, *len) != 0) | |
1003 | ret = -EFAULT; | |
1004 | else | |
1005 | ret = 0; | |
1006 | ||
1007 | xt_table_unlock(t); | |
1008 | module_put(t->me); | |
1009 | } else | |
03d13b68 | 1010 | ret = PTR_ERR(t); |
47a6959f | 1011 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
f415e76f | 1012 | if (in_compat_syscall()) |
3bc3fe5e PM |
1013 | xt_compat_unlock(AF_INET6); |
1014 | #endif | |
433665c9 PM |
1015 | return ret; |
1016 | } | |
1017 | ||
1da177e4 | 1018 | static int |
d5d1baa1 | 1019 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
cda219c6 | 1020 | const int *len) |
1da177e4 LT |
1021 | { |
1022 | int ret; | |
d924357c | 1023 | struct ip6t_get_entries get; |
2e4e6a17 | 1024 | struct xt_table *t; |
1da177e4 | 1025 | |
d7cdf816 | 1026 | if (*len < sizeof(get)) |
d924357c | 1027 | return -EINVAL; |
d924357c PM |
1028 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1029 | return -EFAULT; | |
d7cdf816 | 1030 | if (*len != sizeof(struct ip6t_get_entries) + get.size) |
d924357c | 1031 | return -EINVAL; |
d7cdf816 | 1032 | |
b301f253 | 1033 | get.name[sizeof(get.name) - 1] = '\0'; |
d924357c | 1034 | |
336b517f | 1035 | t = xt_find_table_lock(net, AF_INET6, get.name); |
03d13b68 | 1036 | if (!IS_ERR(t)) { |
d3d40f23 | 1037 | struct xt_table_info *private = t->private; |
d924357c | 1038 | if (get.size == private->size) |
2e4e6a17 | 1039 | ret = copy_entries_to_user(private->size, |
1da177e4 | 1040 | t, uptr->entrytable); |
d7cdf816 | 1041 | else |
544473c1 | 1042 | ret = -EAGAIN; |
d7cdf816 | 1043 | |
6b7d31fc | 1044 | module_put(t->me); |
2e4e6a17 | 1045 | xt_table_unlock(t); |
1da177e4 | 1046 | } else |
03d13b68 | 1047 | ret = PTR_ERR(t); |
1da177e4 LT |
1048 | |
1049 | return ret; | |
1050 | } | |
1051 | ||
1052 | static int | |
336b517f | 1053 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1054 | struct xt_table_info *newinfo, unsigned int num_counters, |
1055 | void __user *counters_ptr) | |
1da177e4 LT |
1056 | { |
1057 | int ret; | |
2e4e6a17 | 1058 | struct xt_table *t; |
3bc3fe5e | 1059 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1060 | struct xt_counters *counters; |
72b2b1dd | 1061 | struct ip6t_entry *iter; |
1da177e4 | 1062 | |
c84ca954 | 1063 | counters = xt_counters_alloc(num_counters); |
1da177e4 LT |
1064 | if (!counters) { |
1065 | ret = -ENOMEM; | |
3bc3fe5e | 1066 | goto out; |
1da177e4 | 1067 | } |
1da177e4 | 1068 | |
03d13b68 FW |
1069 | t = xt_request_find_table_lock(net, AF_INET6, name); |
1070 | if (IS_ERR(t)) { | |
1071 | ret = PTR_ERR(t); | |
1da177e4 | 1072 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1073 | } |
1da177e4 LT |
1074 | |
1075 | /* You lied! */ | |
3bc3fe5e | 1076 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1077 | ret = -EINVAL; |
6b7d31fc | 1078 | goto put_module; |
1da177e4 LT |
1079 | } |
1080 | ||
3bc3fe5e | 1081 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1082 | if (!oldinfo) |
1083 | goto put_module; | |
1084 | ||
1085 | /* Update module usage count based on number of rules */ | |
1ab1457c YH |
1086 | if ((oldinfo->number > oldinfo->initial_entries) || |
1087 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1088 | module_put(t->me); |
1089 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1090 | (newinfo->number <= oldinfo->initial_entries)) | |
1091 | module_put(t->me); | |
1092 | ||
f31e5f1a XL |
1093 | xt_table_unlock(t); |
1094 | ||
d13e7b2e | 1095 | get_old_counters(oldinfo, counters); |
942e4a2b | 1096 | |
1da177e4 | 1097 | /* Decrease module usage counts and free resource */ |
482cfc31 | 1098 | xt_entry_foreach(iter, oldinfo->entries, oldinfo->size) |
0559518b | 1099 | cleanup_entry(iter, net); |
72b2b1dd | 1100 | |
2e4e6a17 | 1101 | xt_free_table_info(oldinfo); |
3bc3fe5e | 1102 | if (copy_to_user(counters_ptr, counters, |
c58dd2dd TG |
1103 | sizeof(struct xt_counters) * num_counters) != 0) { |
1104 | /* Silent error, can't fail, new table is already in place */ | |
1105 | net_warn_ratelimited("ip6tables: counters copy to user failed while replacing table\n"); | |
1106 | } | |
1da177e4 | 1107 | vfree(counters); |
e58a171d | 1108 | return 0; |
1da177e4 LT |
1109 | |
1110 | put_module: | |
1111 | module_put(t->me); | |
2e4e6a17 | 1112 | xt_table_unlock(t); |
1da177e4 | 1113 | free_newinfo_counters_untrans: |
1da177e4 | 1114 | vfree(counters); |
3bc3fe5e PM |
1115 | out: |
1116 | return ret; | |
1117 | } | |
1118 | ||
1119 | static int | |
c2f12630 | 1120 | do_replace(struct net *net, sockptr_t arg, unsigned int len) |
3bc3fe5e PM |
1121 | { |
1122 | int ret; | |
1123 | struct ip6t_replace tmp; | |
1124 | struct xt_table_info *newinfo; | |
1125 | void *loc_cpu_entry; | |
72b2b1dd | 1126 | struct ip6t_entry *iter; |
3bc3fe5e | 1127 | |
0c83842d ED |
1128 | if (len < sizeof(tmp)) |
1129 | return -EINVAL; | |
c2f12630 | 1130 | if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0) |
3bc3fe5e PM |
1131 | return -EFAULT; |
1132 | ||
1133 | /* overflow check */ | |
1134 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1135 | return -ENOMEM; | |
1086bbe9 DJ |
1136 | if (tmp.num_counters == 0) |
1137 | return -EINVAL; | |
65acf6e0 ED |
1138 | if ((u64)len < (u64)tmp.size + sizeof(tmp)) |
1139 | return -EINVAL; | |
1086bbe9 | 1140 | |
6a8ab060 | 1141 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1142 | |
1143 | newinfo = xt_alloc_table_info(tmp.size); | |
1144 | if (!newinfo) | |
1145 | return -ENOMEM; | |
1146 | ||
482cfc31 | 1147 | loc_cpu_entry = newinfo->entries; |
d3c48151 CH |
1148 | if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp), |
1149 | tmp.size) != 0) { | |
3bc3fe5e PM |
1150 | ret = -EFAULT; |
1151 | goto free_newinfo; | |
1152 | } | |
1153 | ||
0f234214 | 1154 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1155 | if (ret != 0) |
1156 | goto free_newinfo; | |
1157 | ||
336b517f | 1158 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1159 | tmp.num_counters, tmp.counters); |
1160 | if (ret) | |
1161 | goto free_newinfo_untrans; | |
1162 | return 0; | |
1163 | ||
1164 | free_newinfo_untrans: | |
72b2b1dd | 1165 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1166 | cleanup_entry(iter, net); |
1da177e4 | 1167 | free_newinfo: |
2e4e6a17 | 1168 | xt_free_table_info(newinfo); |
1da177e4 LT |
1169 | return ret; |
1170 | } | |
1171 | ||
1da177e4 | 1172 | static int |
ab214d1b | 1173 | do_add_counters(struct net *net, sockptr_t arg, unsigned int len) |
1da177e4 | 1174 | { |
482cfc31 | 1175 | unsigned int i; |
3bc3fe5e PM |
1176 | struct xt_counters_info tmp; |
1177 | struct xt_counters *paddc; | |
2e4e6a17 | 1178 | struct xt_table *t; |
5452e425 | 1179 | const struct xt_table_info *private; |
6b7d31fc | 1180 | int ret = 0; |
72b2b1dd | 1181 | struct ip6t_entry *iter; |
7f5c6d4f | 1182 | unsigned int addend; |
1da177e4 | 1183 | |
ab214d1b | 1184 | paddc = xt_copy_counters(arg, len, &tmp); |
d7591f0c FW |
1185 | if (IS_ERR(paddc)) |
1186 | return PTR_ERR(paddc); | |
1187 | t = xt_find_table_lock(net, AF_INET6, tmp.name); | |
03d13b68 FW |
1188 | if (IS_ERR(t)) { |
1189 | ret = PTR_ERR(t); | |
1da177e4 | 1190 | goto free; |
6b7d31fc | 1191 | } |
1da177e4 | 1192 | |
942e4a2b | 1193 | local_bh_disable(); |
d3d40f23 | 1194 | private = t->private; |
d7591f0c | 1195 | if (private->number != tmp.num_counters) { |
1da177e4 LT |
1196 | ret = -EINVAL; |
1197 | goto unlock_up_free; | |
1198 | } | |
1199 | ||
1200 | i = 0; | |
7f5c6d4f | 1201 | addend = xt_write_recseq_begin(); |
482cfc31 | 1202 | xt_entry_foreach(iter, private->entries, private->size) { |
71ae0dff FW |
1203 | struct xt_counters *tmp; |
1204 | ||
1205 | tmp = xt_get_this_cpu_counter(&iter->counters); | |
1206 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); | |
0559518b JE |
1207 | ++i; |
1208 | } | |
7f5c6d4f | 1209 | xt_write_recseq_end(addend); |
1da177e4 | 1210 | unlock_up_free: |
942e4a2b | 1211 | local_bh_enable(); |
2e4e6a17 | 1212 | xt_table_unlock(t); |
6b7d31fc | 1213 | module_put(t->me); |
1da177e4 LT |
1214 | free: |
1215 | vfree(paddc); | |
1216 | ||
1217 | return ret; | |
1218 | } | |
1219 | ||
47a6959f | 1220 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
3bc3fe5e | 1221 | struct compat_ip6t_replace { |
12b00c2c | 1222 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1223 | u32 valid_hooks; |
1224 | u32 num_entries; | |
1225 | u32 size; | |
1226 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1227 | u32 underflow[NF_INET_NUMHOOKS]; | |
1228 | u32 num_counters; | |
87a2e70d | 1229 | compat_uptr_t counters; /* struct xt_counters * */ |
6daf1414 | 1230 | struct compat_ip6t_entry entries[]; |
3bc3fe5e PM |
1231 | }; |
1232 | ||
1233 | static int | |
1234 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1235 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1236 | unsigned int i) |
3bc3fe5e | 1237 | { |
87a2e70d | 1238 | struct xt_entry_target *t; |
3bc3fe5e PM |
1239 | struct compat_ip6t_entry __user *ce; |
1240 | u_int16_t target_offset, next_offset; | |
1241 | compat_uint_t origsize; | |
dcea992a JE |
1242 | const struct xt_entry_match *ematch; |
1243 | int ret = 0; | |
3bc3fe5e | 1244 | |
3bc3fe5e | 1245 | origsize = *size; |
68ad546a | 1246 | ce = *dstptr; |
0559518b JE |
1247 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1248 | copy_to_user(&ce->counters, &counters[i], | |
1249 | sizeof(counters[i])) != 0) | |
1250 | return -EFAULT; | |
3bc3fe5e PM |
1251 | |
1252 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1253 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1254 | ||
dcea992a JE |
1255 | xt_ematch_foreach(ematch, e) { |
1256 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1257 | if (ret != 0) | |
6bdb331b | 1258 | return ret; |
dcea992a | 1259 | } |
3bc3fe5e | 1260 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1261 | t = ip6t_get_target(e); |
1262 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1263 | if (ret) | |
0559518b | 1264 | return ret; |
3bc3fe5e | 1265 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1266 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1267 | put_user(next_offset, &ce->next_offset) != 0) | |
1268 | return -EFAULT; | |
3bc3fe5e | 1269 | return 0; |
3bc3fe5e PM |
1270 | } |
1271 | ||
022748a9 | 1272 | static int |
87a2e70d | 1273 | compat_find_calc_match(struct xt_entry_match *m, |
3bc3fe5e | 1274 | const struct ip6t_ip6 *ipv6, |
6bdb331b | 1275 | int *size) |
3bc3fe5e PM |
1276 | { |
1277 | struct xt_match *match; | |
1278 | ||
fd0ec0e6 JE |
1279 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
1280 | m->u.user.revision); | |
d7cdf816 | 1281 | if (IS_ERR(match)) |
fd0ec0e6 | 1282 | return PTR_ERR(match); |
d7cdf816 | 1283 | |
3bc3fe5e PM |
1284 | m->u.kernel.match = match; |
1285 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1286 | return 0; |
1287 | } | |
1288 | ||
0559518b | 1289 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e | 1290 | { |
87a2e70d | 1291 | struct xt_entry_target *t; |
dcea992a | 1292 | struct xt_entry_match *ematch; |
3bc3fe5e | 1293 | |
3bc3fe5e | 1294 | /* Cleanup all matches */ |
dcea992a | 1295 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1296 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1297 | t = compat_ip6t_get_target(e); |
1298 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1299 | } |
1300 | ||
022748a9 | 1301 | static int |
3bc3fe5e PM |
1302 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1303 | struct xt_table_info *newinfo, | |
1304 | unsigned int *size, | |
d5d1baa1 | 1305 | const unsigned char *base, |
09d96860 | 1306 | const unsigned char *limit) |
3bc3fe5e | 1307 | { |
dcea992a | 1308 | struct xt_entry_match *ematch; |
87a2e70d | 1309 | struct xt_entry_target *t; |
3bc3fe5e PM |
1310 | struct xt_target *target; |
1311 | unsigned int entry_offset; | |
b0a6363c | 1312 | unsigned int j; |
09d96860 | 1313 | int ret, off; |
3bc3fe5e | 1314 | |
3666ed1c | 1315 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
6e94e0cf | 1316 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit || |
d7cdf816 | 1317 | (unsigned char *)e + e->next_offset > limit) |
3bc3fe5e | 1318 | return -EINVAL; |
3bc3fe5e PM |
1319 | |
1320 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
d7cdf816 | 1321 | sizeof(struct compat_xt_entry_target)) |
3bc3fe5e | 1322 | return -EINVAL; |
3bc3fe5e | 1323 | |
aa412ba2 FW |
1324 | if (!ip6_checkentry(&e->ipv6)) |
1325 | return -EINVAL; | |
1326 | ||
ce683e5f | 1327 | ret = xt_compat_check_entry_offsets(e, e->elems, |
fc1221b3 | 1328 | e->target_offset, e->next_offset); |
3bc3fe5e PM |
1329 | if (ret) |
1330 | return ret; | |
1331 | ||
1332 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1333 | entry_offset = (void *)e - (void *)base; | |
1334 | j = 0; | |
dcea992a | 1335 | xt_ematch_foreach(ematch, e) { |
329a0807 | 1336 | ret = compat_find_calc_match(ematch, &e->ipv6, &off); |
dcea992a | 1337 | if (ret != 0) |
6bdb331b JE |
1338 | goto release_matches; |
1339 | ++j; | |
dcea992a | 1340 | } |
3bc3fe5e PM |
1341 | |
1342 | t = compat_ip6t_get_target(e); | |
d2a7b6ba JE |
1343 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
1344 | t->u.user.revision); | |
1345 | if (IS_ERR(target)) { | |
d2a7b6ba | 1346 | ret = PTR_ERR(target); |
3bc3fe5e PM |
1347 | goto release_matches; |
1348 | } | |
1349 | t->u.kernel.target = target; | |
1350 | ||
1351 | off += xt_compat_target_offset(target); | |
1352 | *size += off; | |
1353 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1354 | if (ret) | |
1355 | goto out; | |
1356 | ||
3bc3fe5e PM |
1357 | return 0; |
1358 | ||
1359 | out: | |
1360 | module_put(t->u.kernel.target->me); | |
1361 | release_matches: | |
6bdb331b JE |
1362 | xt_ematch_foreach(ematch, e) { |
1363 | if (j-- == 0) | |
dcea992a | 1364 | break; |
6bdb331b JE |
1365 | module_put(ematch->u.kernel.match->me); |
1366 | } | |
3bc3fe5e PM |
1367 | return ret; |
1368 | } | |
1369 | ||
0188346f | 1370 | static void |
3bc3fe5e | 1371 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, |
329a0807 | 1372 | unsigned int *size, |
3bc3fe5e PM |
1373 | struct xt_table_info *newinfo, unsigned char *base) |
1374 | { | |
87a2e70d | 1375 | struct xt_entry_target *t; |
3bc3fe5e PM |
1376 | struct ip6t_entry *de; |
1377 | unsigned int origsize; | |
0188346f | 1378 | int h; |
dcea992a | 1379 | struct xt_entry_match *ematch; |
3bc3fe5e | 1380 | |
3bc3fe5e | 1381 | origsize = *size; |
68ad546a | 1382 | de = *dstptr; |
3bc3fe5e PM |
1383 | memcpy(de, e, sizeof(struct ip6t_entry)); |
1384 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1385 | ||
1386 | *dstptr += sizeof(struct ip6t_entry); | |
1387 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1388 | ||
0188346f FW |
1389 | xt_ematch_foreach(ematch, e) |
1390 | xt_compat_match_from_user(ematch, dstptr, size); | |
1391 | ||
3bc3fe5e PM |
1392 | de->target_offset = e->target_offset - (origsize - *size); |
1393 | t = compat_ip6t_get_target(e); | |
3bc3fe5e PM |
1394 | xt_compat_target_from_user(t, dstptr, size); |
1395 | ||
1396 | de->next_offset = e->next_offset - (origsize - *size); | |
1397 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1398 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1399 | newinfo->hook_entry[h] -= origsize - *size; | |
1400 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1401 | newinfo->underflow[h] -= origsize - *size; | |
1402 | } | |
3bc3fe5e PM |
1403 | } |
1404 | ||
3bc3fe5e | 1405 | static int |
f54e9367 | 1406 | translate_compat_table(struct net *net, |
3bc3fe5e PM |
1407 | struct xt_table_info **pinfo, |
1408 | void **pentry0, | |
329a0807 | 1409 | const struct compat_ip6t_replace *compatr) |
3bc3fe5e PM |
1410 | { |
1411 | unsigned int i, j; | |
1412 | struct xt_table_info *newinfo, *info; | |
1413 | void *pos, *entry0, *entry1; | |
72b2b1dd | 1414 | struct compat_ip6t_entry *iter0; |
09d96860 | 1415 | struct ip6t_replace repl; |
3bc3fe5e | 1416 | unsigned int size; |
9782a11e | 1417 | int ret; |
3bc3fe5e PM |
1418 | |
1419 | info = *pinfo; | |
1420 | entry0 = *pentry0; | |
329a0807 FW |
1421 | size = compatr->size; |
1422 | info->number = compatr->num_entries; | |
3bc3fe5e | 1423 | |
3bc3fe5e PM |
1424 | j = 0; |
1425 | xt_compat_lock(AF_INET6); | |
9782a11e FW |
1426 | ret = xt_compat_init_offsets(AF_INET6, compatr->num_entries); |
1427 | if (ret) | |
1428 | goto out_unlock; | |
3bc3fe5e | 1429 | /* Walk through entries, checking offsets. */ |
329a0807 | 1430 | xt_entry_foreach(iter0, entry0, compatr->size) { |
72b2b1dd | 1431 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
6b4ff2d7 | 1432 | entry0, |
09d96860 | 1433 | entry0 + compatr->size); |
72b2b1dd | 1434 | if (ret != 0) |
0559518b JE |
1435 | goto out_unlock; |
1436 | ++j; | |
72b2b1dd | 1437 | } |
3bc3fe5e PM |
1438 | |
1439 | ret = -EINVAL; | |
d7cdf816 | 1440 | if (j != compatr->num_entries) |
3bc3fe5e | 1441 | goto out_unlock; |
3bc3fe5e | 1442 | |
3bc3fe5e PM |
1443 | ret = -ENOMEM; |
1444 | newinfo = xt_alloc_table_info(size); | |
1445 | if (!newinfo) | |
1446 | goto out_unlock; | |
1447 | ||
b29c457a FW |
1448 | memset(newinfo->entries, 0, size); |
1449 | ||
329a0807 | 1450 | newinfo->number = compatr->num_entries; |
3bc3fe5e | 1451 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
09d96860 FW |
1452 | newinfo->hook_entry[i] = compatr->hook_entry[i]; |
1453 | newinfo->underflow[i] = compatr->underflow[i]; | |
3bc3fe5e | 1454 | } |
482cfc31 | 1455 | entry1 = newinfo->entries; |
3bc3fe5e | 1456 | pos = entry1; |
09d96860 | 1457 | size = compatr->size; |
0188346f FW |
1458 | xt_entry_foreach(iter0, entry0, compatr->size) |
1459 | compat_copy_entry_from_user(iter0, &pos, &size, | |
1460 | newinfo, entry1); | |
1461 | ||
09d96860 | 1462 | /* all module references in entry0 are now gone. */ |
3bc3fe5e PM |
1463 | xt_compat_flush_offsets(AF_INET6); |
1464 | xt_compat_unlock(AF_INET6); | |
3bc3fe5e | 1465 | |
09d96860 | 1466 | memcpy(&repl, compatr, sizeof(*compatr)); |
3bc3fe5e | 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]; | |
3bc3fe5e PM |
1471 | } |
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 | ||
3bc3fe5e PM |
1480 | *pinfo = newinfo; |
1481 | *pentry0 = entry1; | |
1482 | xt_free_table_info(info); | |
1483 | return 0; | |
1484 | ||
1485 | free_newinfo: | |
1486 | xt_free_table_info(newinfo); | |
09d96860 FW |
1487 | return ret; |
1488 | out_unlock: | |
1489 | xt_compat_flush_offsets(AF_INET6); | |
1490 | xt_compat_unlock(AF_INET6); | |
329a0807 | 1491 | xt_entry_foreach(iter0, entry0, compatr->size) { |
0559518b | 1492 | if (j-- == 0) |
72b2b1dd | 1493 | break; |
0559518b JE |
1494 | compat_release_entry(iter0); |
1495 | } | |
3bc3fe5e | 1496 | return ret; |
3bc3fe5e PM |
1497 | } |
1498 | ||
1499 | static int | |
c2f12630 | 1500 | compat_do_replace(struct net *net, sockptr_t arg, unsigned int len) |
3bc3fe5e PM |
1501 | { |
1502 | int ret; | |
1503 | struct compat_ip6t_replace tmp; | |
1504 | struct xt_table_info *newinfo; | |
1505 | void *loc_cpu_entry; | |
72b2b1dd | 1506 | struct ip6t_entry *iter; |
3bc3fe5e | 1507 | |
0c83842d ED |
1508 | if (len < sizeof(tmp)) |
1509 | return -EINVAL; | |
c2f12630 | 1510 | if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0) |
3bc3fe5e PM |
1511 | return -EFAULT; |
1512 | ||
1513 | /* overflow check */ | |
3bc3fe5e PM |
1514 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1515 | return -ENOMEM; | |
1086bbe9 DJ |
1516 | if (tmp.num_counters == 0) |
1517 | return -EINVAL; | |
65acf6e0 ED |
1518 | if ((u64)len < (u64)tmp.size + sizeof(tmp)) |
1519 | return -EINVAL; | |
1086bbe9 | 1520 | |
6a8ab060 | 1521 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1522 | |
1523 | newinfo = xt_alloc_table_info(tmp.size); | |
1524 | if (!newinfo) | |
1525 | return -ENOMEM; | |
1526 | ||
482cfc31 | 1527 | loc_cpu_entry = newinfo->entries; |
d3c48151 CH |
1528 | if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp), |
1529 | tmp.size) != 0) { | |
3bc3fe5e PM |
1530 | ret = -EFAULT; |
1531 | goto free_newinfo; | |
1532 | } | |
1533 | ||
329a0807 | 1534 | ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1535 | if (ret != 0) |
1536 | goto free_newinfo; | |
1537 | ||
336b517f | 1538 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1539 | tmp.num_counters, compat_ptr(tmp.counters)); |
1540 | if (ret) | |
1541 | goto free_newinfo_untrans; | |
1542 | return 0; | |
1543 | ||
1544 | free_newinfo_untrans: | |
72b2b1dd | 1545 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1546 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1547 | free_newinfo: |
1548 | xt_free_table_info(newinfo); | |
1549 | return ret; | |
1550 | } | |
1551 | ||
3bc3fe5e | 1552 | struct compat_ip6t_get_entries { |
12b00c2c | 1553 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e | 1554 | compat_uint_t size; |
6daf1414 | 1555 | struct compat_ip6t_entry entrytable[]; |
3bc3fe5e PM |
1556 | }; |
1557 | ||
1558 | static int | |
1559 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1560 | void __user *userptr) | |
1561 | { | |
1562 | struct xt_counters *counters; | |
d3d40f23 | 1563 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1564 | void __user *pos; |
1565 | unsigned int size; | |
1566 | int ret = 0; | |
3bc3fe5e | 1567 | unsigned int i = 0; |
72b2b1dd | 1568 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1569 | |
1570 | counters = alloc_counters(table); | |
1571 | if (IS_ERR(counters)) | |
1572 | return PTR_ERR(counters); | |
1573 | ||
3bc3fe5e PM |
1574 | pos = userptr; |
1575 | size = total_size; | |
482cfc31 | 1576 | xt_entry_foreach(iter, private->entries, total_size) { |
72b2b1dd | 1577 | ret = compat_copy_entry_to_user(iter, &pos, |
6b4ff2d7 | 1578 | &size, counters, i++); |
72b2b1dd JE |
1579 | if (ret != 0) |
1580 | break; | |
1581 | } | |
3bc3fe5e PM |
1582 | |
1583 | vfree(counters); | |
1584 | return ret; | |
1585 | } | |
1586 | ||
1587 | static int | |
336b517f AD |
1588 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1589 | int *len) | |
3bc3fe5e PM |
1590 | { |
1591 | int ret; | |
1592 | struct compat_ip6t_get_entries get; | |
1593 | struct xt_table *t; | |
1594 | ||
d7cdf816 | 1595 | if (*len < sizeof(get)) |
3bc3fe5e | 1596 | return -EINVAL; |
3bc3fe5e PM |
1597 | |
1598 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1599 | return -EFAULT; | |
1600 | ||
d7cdf816 | 1601 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) |
3bc3fe5e | 1602 | return -EINVAL; |
d7cdf816 | 1603 | |
b301f253 | 1604 | get.name[sizeof(get.name) - 1] = '\0'; |
3bc3fe5e PM |
1605 | |
1606 | xt_compat_lock(AF_INET6); | |
336b517f | 1607 | t = xt_find_table_lock(net, AF_INET6, get.name); |
03d13b68 | 1608 | if (!IS_ERR(t)) { |
abe7034b | 1609 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1610 | struct xt_table_info info; |
3bc3fe5e | 1611 | ret = compat_table_info(private, &info); |
d7cdf816 | 1612 | if (!ret && get.size == info.size) |
3bc3fe5e PM |
1613 | ret = compat_copy_entries_to_user(private->size, |
1614 | t, uptr->entrytable); | |
d7cdf816 | 1615 | else if (!ret) |
544473c1 | 1616 | ret = -EAGAIN; |
d7cdf816 | 1617 | |
3bc3fe5e PM |
1618 | xt_compat_flush_offsets(AF_INET6); |
1619 | module_put(t->me); | |
1620 | xt_table_unlock(t); | |
1621 | } else | |
03d13b68 | 1622 | ret = PTR_ERR(t); |
3bc3fe5e PM |
1623 | |
1624 | xt_compat_unlock(AF_INET6); | |
1625 | return ret; | |
1626 | } | |
3bc3fe5e PM |
1627 | #endif |
1628 | ||
1da177e4 | 1629 | static int |
c2f12630 | 1630 | do_ip6t_set_ctl(struct sock *sk, int cmd, sockptr_t arg, unsigned int len) |
1da177e4 LT |
1631 | { |
1632 | int ret; | |
1633 | ||
af31f412 | 1634 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1635 | return -EPERM; |
1636 | ||
1637 | switch (cmd) { | |
1638 | case IP6T_SO_SET_REPLACE: | |
47a6959f | 1639 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
f415e76f | 1640 | if (in_compat_syscall()) |
c2f12630 | 1641 | ret = compat_do_replace(sock_net(sk), arg, len); |
f415e76f CH |
1642 | else |
1643 | #endif | |
c2f12630 | 1644 | ret = do_replace(sock_net(sk), arg, len); |
1da177e4 LT |
1645 | break; |
1646 | ||
1647 | case IP6T_SO_SET_ADD_COUNTERS: | |
c2f12630 | 1648 | ret = do_add_counters(sock_net(sk), arg, len); |
1da177e4 LT |
1649 | break; |
1650 | ||
1651 | default: | |
1da177e4 LT |
1652 | ret = -EINVAL; |
1653 | } | |
1654 | ||
1655 | return ret; | |
1656 | } | |
1657 | ||
1658 | static int | |
1659 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1660 | { | |
1661 | int ret; | |
1662 | ||
af31f412 | 1663 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1664 | return -EPERM; |
1665 | ||
1666 | switch (cmd) { | |
433665c9 | 1667 | case IP6T_SO_GET_INFO: |
f415e76f | 1668 | ret = get_info(sock_net(sk), user, len); |
433665c9 | 1669 | break; |
1da177e4 | 1670 | |
d924357c | 1671 | case IP6T_SO_GET_ENTRIES: |
47a6959f | 1672 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
f415e76f CH |
1673 | if (in_compat_syscall()) |
1674 | ret = compat_get_entries(sock_net(sk), user, len); | |
1675 | else | |
1676 | #endif | |
1677 | ret = get_entries(sock_net(sk), user, len); | |
1da177e4 | 1678 | break; |
1da177e4 | 1679 | |
6b7d31fc HW |
1680 | case IP6T_SO_GET_REVISION_MATCH: |
1681 | case IP6T_SO_GET_REVISION_TARGET: { | |
12b00c2c | 1682 | struct xt_get_revision rev; |
2e4e6a17 | 1683 | int target; |
6b7d31fc HW |
1684 | |
1685 | if (*len != sizeof(rev)) { | |
1686 | ret = -EINVAL; | |
1687 | break; | |
1688 | } | |
1689 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1690 | ret = -EFAULT; | |
1691 | break; | |
1692 | } | |
6a8ab060 | 1693 | rev.name[sizeof(rev.name)-1] = 0; |
6b7d31fc HW |
1694 | |
1695 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 1696 | target = 1; |
6b7d31fc | 1697 | else |
2e4e6a17 | 1698 | target = 0; |
6b7d31fc | 1699 | |
2e4e6a17 HW |
1700 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
1701 | rev.revision, | |
1702 | target, &ret), | |
6b7d31fc HW |
1703 | "ip6t_%s", rev.name); |
1704 | break; | |
1705 | } | |
1706 | ||
1da177e4 | 1707 | default: |
1da177e4 LT |
1708 | ret = -EINVAL; |
1709 | } | |
1710 | ||
1711 | return ret; | |
1712 | } | |
1713 | ||
b9e69e12 FW |
1714 | static void __ip6t_unregister_table(struct net *net, struct xt_table *table) |
1715 | { | |
1716 | struct xt_table_info *private; | |
1717 | void *loc_cpu_entry; | |
1718 | struct module *table_owner = table->me; | |
1719 | struct ip6t_entry *iter; | |
1720 | ||
1721 | private = xt_unregister_table(table); | |
1722 | ||
1723 | /* Decrease module usage counts and free resources */ | |
1724 | loc_cpu_entry = private->entries; | |
1725 | xt_entry_foreach(iter, loc_cpu_entry, private->size) | |
1726 | cleanup_entry(iter, net); | |
1727 | if (private->number > private->initial_entries) | |
1728 | module_put(table_owner); | |
1729 | xt_free_table_info(private); | |
1730 | } | |
1731 | ||
a67dd266 FW |
1732 | int ip6t_register_table(struct net *net, const struct xt_table *table, |
1733 | const struct ip6t_replace *repl, | |
ee177a54 | 1734 | const struct nf_hook_ops *template_ops) |
1da177e4 | 1735 | { |
ee177a54 FW |
1736 | struct nf_hook_ops *ops; |
1737 | unsigned int num_ops; | |
1738 | int ret, i; | |
2e4e6a17 | 1739 | struct xt_table_info *newinfo; |
f3c5c1bf | 1740 | struct xt_table_info bootstrap = {0}; |
31836064 | 1741 | void *loc_cpu_entry; |
a98da11d | 1742 | struct xt_table *new_table; |
1da177e4 | 1743 | |
2e4e6a17 | 1744 | newinfo = xt_alloc_table_info(repl->size); |
a67dd266 FW |
1745 | if (!newinfo) |
1746 | return -ENOMEM; | |
1da177e4 | 1747 | |
482cfc31 | 1748 | loc_cpu_entry = newinfo->entries; |
31836064 | 1749 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
1da177e4 | 1750 | |
0f234214 | 1751 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
ee177a54 FW |
1752 | if (ret != 0) { |
1753 | xt_free_table_info(newinfo); | |
1754 | return ret; | |
1755 | } | |
1da177e4 | 1756 | |
336b517f | 1757 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 1758 | if (IS_ERR(new_table)) { |
0af8c09c PT |
1759 | struct ip6t_entry *iter; |
1760 | ||
1761 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) | |
1762 | cleanup_entry(iter, net); | |
ee177a54 FW |
1763 | xt_free_table_info(newinfo); |
1764 | return PTR_ERR(new_table); | |
1da177e4 | 1765 | } |
a67dd266 | 1766 | |
ee177a54 | 1767 | if (!template_ops) |
ba7d284a | 1768 | return 0; |
b9e69e12 | 1769 | |
ee177a54 FW |
1770 | num_ops = hweight32(table->valid_hooks); |
1771 | if (num_ops == 0) { | |
1772 | ret = -EINVAL; | |
1773 | goto out_free; | |
b9e69e12 FW |
1774 | } |
1775 | ||
ee177a54 FW |
1776 | ops = kmemdup(template_ops, sizeof(*ops) * num_ops, GFP_KERNEL); |
1777 | if (!ops) { | |
1778 | ret = -ENOMEM; | |
1779 | goto out_free; | |
1780 | } | |
1781 | ||
1782 | for (i = 0; i < num_ops; i++) | |
1783 | ops[i].priv = new_table; | |
1784 | ||
1785 | new_table->ops = ops; | |
1786 | ||
1787 | ret = nf_register_net_hooks(net, ops, num_ops); | |
1788 | if (ret != 0) | |
1789 | goto out_free; | |
1790 | ||
a67dd266 | 1791 | return ret; |
1da177e4 | 1792 | |
44d34e72 | 1793 | out_free: |
ee177a54 | 1794 | __ip6t_unregister_table(net, new_table); |
a67dd266 | 1795 | return ret; |
1da177e4 LT |
1796 | } |
1797 | ||
ee177a54 | 1798 | void ip6t_unregister_table_pre_exit(struct net *net, const char *name) |
57ea5f18 | 1799 | { |
6c071754 FW |
1800 | struct xt_table *table = xt_find_table(net, NFPROTO_IPV6, name); |
1801 | ||
1802 | if (table) | |
ee177a54 | 1803 | nf_unregister_net_hooks(net, table->ops, hweight32(table->valid_hooks)); |
57ea5f18 DW |
1804 | } |
1805 | ||
6c071754 | 1806 | void ip6t_unregister_table_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) | |
1811 | __ip6t_unregister_table(net, table); | |
57ea5f18 DW |
1812 | } |
1813 | ||
1da177e4 | 1814 | /* The built-in targets: standard (NULL) and error. */ |
4538506b JE |
1815 | static struct xt_target ip6t_builtin_tg[] __read_mostly = { |
1816 | { | |
243bf6e2 | 1817 | .name = XT_STANDARD_TARGET, |
4538506b JE |
1818 | .targetsize = sizeof(int), |
1819 | .family = NFPROTO_IPV6, | |
47a6959f | 1820 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
4538506b JE |
1821 | .compatsize = sizeof(compat_int_t), |
1822 | .compat_from_user = compat_standard_from_user, | |
1823 | .compat_to_user = compat_standard_to_user, | |
3bc3fe5e | 1824 | #endif |
4538506b JE |
1825 | }, |
1826 | { | |
243bf6e2 | 1827 | .name = XT_ERROR_TARGET, |
4538506b | 1828 | .target = ip6t_error, |
12b00c2c | 1829 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
1830 | .family = NFPROTO_IPV6, |
1831 | }, | |
1da177e4 LT |
1832 | }; |
1833 | ||
1834 | static struct nf_sockopt_ops ip6t_sockopts = { | |
1835 | .pf = PF_INET6, | |
1836 | .set_optmin = IP6T_BASE_CTL, | |
1837 | .set_optmax = IP6T_SO_SET_MAX+1, | |
1838 | .set = do_ip6t_set_ctl, | |
1839 | .get_optmin = IP6T_BASE_CTL, | |
1840 | .get_optmax = IP6T_SO_GET_MAX+1, | |
1841 | .get = do_ip6t_get_ctl, | |
16fcec35 | 1842 | .owner = THIS_MODULE, |
1da177e4 LT |
1843 | }; |
1844 | ||
3cb609d5 AD |
1845 | static int __net_init ip6_tables_net_init(struct net *net) |
1846 | { | |
383ca5b8 | 1847 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
1848 | } |
1849 | ||
1850 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
1851 | { | |
383ca5b8 | 1852 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
1853 | } |
1854 | ||
1855 | static struct pernet_operations ip6_tables_net_ops = { | |
1856 | .init = ip6_tables_net_init, | |
1857 | .exit = ip6_tables_net_exit, | |
1858 | }; | |
1859 | ||
65b4b4e8 | 1860 | static int __init ip6_tables_init(void) |
1da177e4 LT |
1861 | { |
1862 | int ret; | |
1863 | ||
3cb609d5 | 1864 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
1865 | if (ret < 0) |
1866 | goto err1; | |
2e4e6a17 | 1867 | |
25985edc | 1868 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 1869 | ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 PM |
1870 | if (ret < 0) |
1871 | goto err2; | |
1da177e4 LT |
1872 | |
1873 | /* Register setsockopt */ | |
1874 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 | 1875 | if (ret < 0) |
36ce9982 | 1876 | goto err4; |
1da177e4 | 1877 | |
1da177e4 | 1878 | return 0; |
0eff66e6 | 1879 | |
0eff66e6 | 1880 | err4: |
4538506b | 1881 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 | 1882 | err2: |
3cb609d5 | 1883 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
1884 | err1: |
1885 | return ret; | |
1da177e4 LT |
1886 | } |
1887 | ||
65b4b4e8 | 1888 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
1889 | { |
1890 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 1891 | |
4538506b | 1892 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
3cb609d5 | 1893 | unregister_pernet_subsys(&ip6_tables_net_ops); |
1da177e4 LT |
1894 | } |
1895 | ||
1896 | EXPORT_SYMBOL(ip6t_register_table); | |
57ea5f18 DW |
1897 | EXPORT_SYMBOL(ip6t_unregister_table_pre_exit); |
1898 | EXPORT_SYMBOL(ip6t_unregister_table_exit); | |
1da177e4 | 1899 | EXPORT_SYMBOL(ip6t_do_table); |
1da177e4 | 1900 | |
65b4b4e8 AM |
1901 | module_init(ip6_tables_init); |
1902 | module_exit(ip6_tables_fini); |