Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Packet matching code. | |
3 | * | |
4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
6b7d31fc | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
f229f6ce | 6 | * Copyright (c) 2006-2010 Patrick McHardy <kaber@trash.net> |
1da177e4 LT |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
1da177e4 | 11 | */ |
a81b2ce8 | 12 | |
90e7d4ab | 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
a81b2ce8 JP |
14 | |
15 | #include <linux/kernel.h> | |
4fc268d2 | 16 | #include <linux/capability.h> |
14c85021 | 17 | #include <linux/in.h> |
1da177e4 LT |
18 | #include <linux/skbuff.h> |
19 | #include <linux/kmod.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/netdevice.h> | |
22 | #include <linux/module.h> | |
4bdbf6c0 | 23 | #include <linux/poison.h> |
1da177e4 | 24 | #include <linux/icmpv6.h> |
1da177e4 | 25 | #include <net/ipv6.h> |
3bc3fe5e | 26 | #include <net/compat.h> |
7c0f6ba6 | 27 | #include <linux/uaccess.h> |
57b47a53 | 28 | #include <linux/mutex.h> |
1da177e4 | 29 | #include <linux/proc_fs.h> |
3bc3fe5e | 30 | #include <linux/err.h> |
c8923c6b | 31 | #include <linux/cpumask.h> |
1da177e4 LT |
32 | |
33 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
2e4e6a17 | 34 | #include <linux/netfilter/x_tables.h> |
f01ffbd6 | 35 | #include <net/netfilter/nf_log.h> |
e3eaa991 | 36 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
37 | |
38 | MODULE_LICENSE("GPL"); | |
39 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
40 | MODULE_DESCRIPTION("IPv6 packet filter"); | |
41 | ||
e3eaa991 JE |
42 | void *ip6t_alloc_initial_table(const struct xt_table *info) |
43 | { | |
44 | return xt_alloc_initial_table(ip6t, IP6T); | |
45 | } | |
46 | EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table); | |
47 | ||
1da177e4 | 48 | /* Returns whether matches rule or not. */ |
022748a9 | 49 | /* Performance critical - called for every packet */ |
1d93a9cb | 50 | static inline bool |
1da177e4 LT |
51 | ip6_packet_match(const struct sk_buff *skb, |
52 | const char *indev, | |
53 | const char *outdev, | |
54 | const struct ip6t_ip6 *ip6info, | |
55 | unsigned int *protoff, | |
cff533ac | 56 | int *fragoff, bool *hotdrop) |
1da177e4 | 57 | { |
1da177e4 | 58 | unsigned long ret; |
0660e03f | 59 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
1da177e4 | 60 | |
c37a2dfa JP |
61 | if (NF_INVF(ip6info, IP6T_INV_SRCIP, |
62 | ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, | |
63 | &ip6info->src)) || | |
64 | NF_INVF(ip6info, IP6T_INV_DSTIP, | |
65 | ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, | |
66 | &ip6info->dst))) | |
1d93a9cb | 67 | return false; |
1da177e4 | 68 | |
b8dfe498 | 69 | ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask); |
1da177e4 | 70 | |
c37a2dfa | 71 | if (NF_INVF(ip6info, IP6T_INV_VIA_IN, ret != 0)) |
1d93a9cb | 72 | return false; |
1da177e4 | 73 | |
b8dfe498 | 74 | ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask); |
1da177e4 | 75 | |
c37a2dfa | 76 | if (NF_INVF(ip6info, IP6T_INV_VIA_OUT, ret != 0)) |
1d93a9cb | 77 | return false; |
1da177e4 LT |
78 | |
79 | /* ... might want to do something with class and flowlabel here ... */ | |
80 | ||
81 | /* look for the desired protocol header */ | |
4305ae44 | 82 | if (ip6info->flags & IP6T_F_PROTO) { |
b777e0ce PM |
83 | int protohdr; |
84 | unsigned short _frag_off; | |
1da177e4 | 85 | |
84018f55 | 86 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off, NULL); |
51d8b1a6 PM |
87 | if (protohdr < 0) { |
88 | if (_frag_off == 0) | |
cff533ac | 89 | *hotdrop = true; |
1d93a9cb | 90 | return false; |
51d8b1a6 | 91 | } |
b777e0ce | 92 | *fragoff = _frag_off; |
1da177e4 | 93 | |
b777e0ce | 94 | if (ip6info->proto == protohdr) { |
4305ae44 | 95 | if (ip6info->invflags & IP6T_INV_PROTO) |
1d93a9cb | 96 | return false; |
4305ae44 | 97 | |
1d93a9cb | 98 | return true; |
1da177e4 LT |
99 | } |
100 | ||
101 | /* We need match for the '-p all', too! */ | |
102 | if ((ip6info->proto != 0) && | |
103 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
1d93a9cb | 104 | return false; |
1da177e4 | 105 | } |
1d93a9cb | 106 | return true; |
1da177e4 LT |
107 | } |
108 | ||
109 | /* should be ip6 safe */ | |
022748a9 | 110 | static bool |
1da177e4 LT |
111 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
112 | { | |
d7cdf816 | 113 | if (ipv6->flags & ~IP6T_F_MASK) |
ccb79bdc | 114 | return false; |
d7cdf816 | 115 | if (ipv6->invflags & ~IP6T_INV_MASK) |
ccb79bdc | 116 | return false; |
d7cdf816 | 117 | |
ccb79bdc | 118 | return true; |
1da177e4 LT |
119 | } |
120 | ||
121 | static unsigned int | |
4b560b44 | 122 | ip6t_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 123 | { |
e87cc472 | 124 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
125 | |
126 | return NF_DROP; | |
127 | } | |
128 | ||
1da177e4 | 129 | static inline struct ip6t_entry * |
d5d1baa1 | 130 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
131 | { |
132 | return (struct ip6t_entry *)(base + offset); | |
133 | } | |
134 | ||
ba9dda3a | 135 | /* All zeroes == unconditional rule. */ |
022748a9 | 136 | /* Mildly perf critical (only if packet tracing is on) */ |
54d83fc7 | 137 | static inline bool unconditional(const struct ip6t_entry *e) |
ba9dda3a | 138 | { |
47901dc2 | 139 | static const struct ip6t_ip6 uncond; |
ba9dda3a | 140 | |
54d83fc7 FW |
141 | return e->target_offset == sizeof(struct ip6t_entry) && |
142 | memcmp(&e->ipv6, &uncond, sizeof(uncond)) == 0; | |
ba9dda3a JK |
143 | } |
144 | ||
87a2e70d | 145 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
146 | ip6t_get_target_c(const struct ip6t_entry *e) |
147 | { | |
148 | return ip6t_get_target((struct ip6t_entry *)e); | |
149 | } | |
150 | ||
07a93626 | 151 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
ba9dda3a | 152 | /* This cries for unification! */ |
022748a9 | 153 | static const char *const hooknames[] = { |
6e23ae2a PM |
154 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
155 | [NF_INET_LOCAL_IN] = "INPUT", | |
156 | [NF_INET_FORWARD] = "FORWARD", | |
157 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
158 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
159 | }; |
160 | ||
161 | enum nf_ip_trace_comments { | |
162 | NF_IP6_TRACE_COMMENT_RULE, | |
163 | NF_IP6_TRACE_COMMENT_RETURN, | |
164 | NF_IP6_TRACE_COMMENT_POLICY, | |
165 | }; | |
166 | ||
022748a9 | 167 | static const char *const comments[] = { |
ba9dda3a JK |
168 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
169 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
170 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
171 | }; | |
172 | ||
549d2d41 | 173 | static const struct nf_loginfo trace_loginfo = { |
ba9dda3a JK |
174 | .type = NF_LOG_TYPE_LOG, |
175 | .u = { | |
176 | .log = { | |
a81b2ce8 | 177 | .level = LOGLEVEL_WARNING, |
ff107d27 | 178 | .logflags = NF_LOG_DEFAULT_MASK, |
ba9dda3a JK |
179 | }, |
180 | }, | |
181 | }; | |
182 | ||
022748a9 | 183 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 184 | static inline int |
d5d1baa1 | 185 | get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e, |
4f2f6f23 JE |
186 | const char *hookname, const char **chainname, |
187 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 188 | { |
87a2e70d | 189 | const struct xt_standard_target *t = (void *)ip6t_get_target_c(s); |
ba9dda3a | 190 | |
243bf6e2 | 191 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
192 | /* Head of user chain: ERROR target with chainname */ |
193 | *chainname = t->target.data; | |
194 | (*rulenum) = 0; | |
195 | } else if (s == e) { | |
196 | (*rulenum)++; | |
197 | ||
54d83fc7 | 198 | if (unconditional(s) && |
3666ed1c | 199 | strcmp(t->target.u.kernel.target->name, |
243bf6e2 | 200 | XT_STANDARD_TARGET) == 0 && |
54d83fc7 | 201 | t->verdict < 0) { |
ba9dda3a JK |
202 | /* Tail of chains: STANDARD target (return/policy) */ |
203 | *comment = *chainname == hookname | |
4f2f6f23 JE |
204 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
205 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
206 | } |
207 | return 1; | |
208 | } else | |
209 | (*rulenum)++; | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
9dff2c96 EB |
214 | static void trace_packet(struct net *net, |
215 | const struct sk_buff *skb, | |
ba9dda3a JK |
216 | unsigned int hook, |
217 | const struct net_device *in, | |
218 | const struct net_device *out, | |
ecb6f85e | 219 | const char *tablename, |
d5d1baa1 JE |
220 | const struct xt_table_info *private, |
221 | const struct ip6t_entry *e) | |
ba9dda3a | 222 | { |
5452e425 | 223 | const struct ip6t_entry *root; |
4f2f6f23 | 224 | const char *hookname, *chainname, *comment; |
72b2b1dd | 225 | const struct ip6t_entry *iter; |
ba9dda3a JK |
226 | unsigned int rulenum = 0; |
227 | ||
482cfc31 | 228 | root = get_entry(private->entries, private->hook_entry[hook]); |
ba9dda3a | 229 | |
4f2f6f23 JE |
230 | hookname = chainname = hooknames[hook]; |
231 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; | |
ba9dda3a | 232 | |
72b2b1dd JE |
233 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
234 | if (get_chainname_rulenum(iter, e, hookname, | |
235 | &chainname, &comment, &rulenum) != 0) | |
236 | break; | |
ba9dda3a | 237 | |
4017a7ee PNA |
238 | nf_log_trace(net, AF_INET6, hook, skb, in, out, &trace_loginfo, |
239 | "TRACE: %s:%s:%s:%u ", | |
240 | tablename, chainname, comment, rulenum); | |
ba9dda3a JK |
241 | } |
242 | #endif | |
243 | ||
6c7941de | 244 | static inline struct ip6t_entry * |
98e86403 JE |
245 | ip6t_next_entry(const struct ip6t_entry *entry) |
246 | { | |
247 | return (void *)entry + entry->next_offset; | |
248 | } | |
249 | ||
1da177e4 LT |
250 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
251 | unsigned int | |
3db05fea | 252 | ip6t_do_table(struct sk_buff *skb, |
8f8a3715 | 253 | const struct nf_hook_state *state, |
fe1cb108 | 254 | struct xt_table *table) |
1da177e4 | 255 | { |
6cb8ff3f | 256 | unsigned int hook = state->hook; |
6b7d31fc | 257 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
258 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
259 | unsigned int verdict = NF_DROP; | |
260 | const char *indev, *outdev; | |
d5d1baa1 | 261 | const void *table_base; |
f3c5c1bf | 262 | struct ip6t_entry *e, **jumpstack; |
7814b6ec | 263 | unsigned int stackidx, cpu; |
d5d1baa1 | 264 | const struct xt_table_info *private; |
de74c169 | 265 | struct xt_action_param acpar; |
7f5c6d4f | 266 | unsigned int addend; |
1da177e4 LT |
267 | |
268 | /* Initialization */ | |
7814b6ec | 269 | stackidx = 0; |
8f8a3715 DM |
270 | indev = state->in ? state->in->name : nulldevname; |
271 | outdev = state->out ? state->out->name : nulldevname; | |
1da177e4 LT |
272 | /* We handle fragments by dealing with the first fragment as |
273 | * if it was a normal packet. All other fragments are treated | |
274 | * normally, except that they will NEVER match rules that ask | |
275 | * things we don't know, ie. tcp syn flag or ports). If the | |
276 | * rule is also a fragment-specific rule, non-fragments won't | |
277 | * match it. */ | |
b4ba2611 | 278 | acpar.hotdrop = false; |
613dbd95 | 279 | acpar.state = state; |
1da177e4 | 280 | |
9efdb14f | 281 | WARN_ON(!(table->valid_hooks & (1 << hook))); |
78454473 | 282 | |
7f5c6d4f ED |
283 | local_bh_disable(); |
284 | addend = xt_write_recseq_begin(); | |
942e4a2b | 285 | private = table->private; |
b416c144 WD |
286 | /* |
287 | * Ensure we load private-> members after we've fetched the base | |
288 | * pointer. | |
289 | */ | |
290 | smp_read_barrier_depends(); | |
f3c5c1bf | 291 | cpu = smp_processor_id(); |
482cfc31 | 292 | table_base = private->entries; |
f3c5c1bf | 293 | jumpstack = (struct ip6t_entry **)private->jumpstack[cpu]; |
7814b6ec FW |
294 | |
295 | /* Switch to alternate jumpstack if we're being invoked via TEE. | |
296 | * TEE issues XT_CONTINUE verdict on original skb so we must not | |
297 | * clobber the jumpstack. | |
298 | * | |
299 | * For recursion via REJECT or SYNPROXY the stack will be clobbered | |
300 | * but it is no problem since absolute verdict is issued by these. | |
301 | */ | |
dcebd315 FW |
302 | if (static_key_false(&xt_tee_enabled)) |
303 | jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated); | |
78454473 | 304 | |
2e4e6a17 | 305 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 306 | |
1da177e4 | 307 | do { |
87a2e70d | 308 | const struct xt_entry_target *t; |
dcea992a | 309 | const struct xt_entry_match *ematch; |
71ae0dff | 310 | struct xt_counters *counter; |
a1ff4ac8 | 311 | |
9efdb14f | 312 | WARN_ON(!e); |
84018f55 | 313 | acpar.thoff = 0; |
a1ff4ac8 | 314 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
b4ba2611 | 315 | &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) { |
dcea992a | 316 | no_match: |
a1ff4ac8 JE |
317 | e = ip6t_next_entry(e); |
318 | continue; | |
319 | } | |
1da177e4 | 320 | |
ef53d702 | 321 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
322 | acpar.match = ematch->u.kernel.match; |
323 | acpar.matchinfo = ematch->data; | |
324 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 325 | goto no_match; |
ef53d702 | 326 | } |
dcea992a | 327 | |
71ae0dff FW |
328 | counter = xt_get_this_cpu_counter(&e->counters); |
329 | ADD_COUNTER(*counter, skb->len, 1); | |
1da177e4 | 330 | |
d5d1baa1 | 331 | t = ip6t_get_target_c(e); |
9efdb14f | 332 | WARN_ON(!t->u.kernel.target); |
ba9dda3a | 333 | |
07a93626 | 334 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
335 | /* The packet is traced: log it */ |
336 | if (unlikely(skb->nf_trace)) | |
9dff2c96 EB |
337 | trace_packet(state->net, skb, hook, state->in, |
338 | state->out, table->name, private, e); | |
ba9dda3a | 339 | #endif |
a1ff4ac8 JE |
340 | /* Standard target? */ |
341 | if (!t->u.kernel.target->target) { | |
342 | int v; | |
343 | ||
87a2e70d | 344 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
345 | if (v < 0) { |
346 | /* Pop from stack? */ | |
243bf6e2 | 347 | if (v != XT_RETURN) { |
95c96174 | 348 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 349 | break; |
1da177e4 | 350 | } |
7814b6ec | 351 | if (stackidx == 0) |
f3c5c1bf JE |
352 | e = get_entry(table_base, |
353 | private->underflow[hook]); | |
354 | else | |
7814b6ec | 355 | e = ip6t_next_entry(jumpstack[--stackidx]); |
a1ff4ac8 JE |
356 | continue; |
357 | } | |
3666ed1c JP |
358 | if (table_base + v != ip6t_next_entry(e) && |
359 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
638c2e4e FW |
360 | if (unlikely(stackidx >= private->stacksize)) { |
361 | verdict = NF_DROP; | |
362 | break; | |
363 | } | |
7814b6ec | 364 | jumpstack[stackidx++] = e; |
a1ff4ac8 | 365 | } |
1da177e4 | 366 | |
a1ff4ac8 | 367 | e = get_entry(table_base, v); |
7a6b1c46 JE |
368 | continue; |
369 | } | |
370 | ||
de74c169 JE |
371 | acpar.target = t->u.kernel.target; |
372 | acpar.targinfo = t->data; | |
7eb35586 | 373 | |
de74c169 | 374 | verdict = t->u.kernel.target->target(skb, &acpar); |
243bf6e2 | 375 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
376 | e = ip6t_next_entry(e); |
377 | else | |
378 | /* Verdict */ | |
379 | break; | |
b4ba2611 | 380 | } while (!acpar.hotdrop); |
1da177e4 | 381 | |
7695495d IM |
382 | xt_write_recseq_end(addend); |
383 | local_bh_enable(); | |
1da177e4 | 384 | |
b4ba2611 | 385 | if (acpar.hotdrop) |
1da177e4 LT |
386 | return NF_DROP; |
387 | else return verdict; | |
1da177e4 LT |
388 | } |
389 | ||
1da177e4 | 390 | /* Figures out from what hook each rule can be called: returns 0 if |
98dbbfc3 | 391 | there are loops. Puts hook bitmask in comefrom. */ |
1da177e4 | 392 | static int |
98dbbfc3 | 393 | mark_source_chains(const struct xt_table_info *newinfo, |
f4dc7771 FW |
394 | unsigned int valid_hooks, void *entry0, |
395 | unsigned int *offsets) | |
1da177e4 LT |
396 | { |
397 | unsigned int hook; | |
398 | ||
399 | /* No recursion; use packet counter to save back ptrs (reset | |
400 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 401 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 402 | unsigned int pos = newinfo->hook_entry[hook]; |
68ad546a | 403 | struct ip6t_entry *e = entry0 + pos; |
1da177e4 LT |
404 | |
405 | if (!(valid_hooks & (1 << hook))) | |
406 | continue; | |
407 | ||
408 | /* Set initial back pointer. */ | |
409 | e->counters.pcnt = pos; | |
410 | ||
411 | for (;;) { | |
87a2e70d | 412 | const struct xt_standard_target *t |
d5d1baa1 | 413 | = (void *)ip6t_get_target_c(e); |
9c547959 | 414 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 415 | |
d7cdf816 | 416 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) |
1da177e4 | 417 | return 0; |
d7cdf816 | 418 | |
9c547959 | 419 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
420 | |
421 | /* Unconditional return/END. */ | |
54d83fc7 | 422 | if ((unconditional(e) && |
3666ed1c | 423 | (strcmp(t->target.u.user.name, |
243bf6e2 | 424 | XT_STANDARD_TARGET) == 0) && |
54d83fc7 | 425 | t->verdict < 0) || visited) { |
1da177e4 LT |
426 | unsigned int oldpos, size; |
427 | ||
1f9352ae | 428 | if ((strcmp(t->target.u.user.name, |
243bf6e2 | 429 | XT_STANDARD_TARGET) == 0) && |
d7cdf816 | 430 | t->verdict < -NF_MAX_VERDICT - 1) |
74c9c0c1 | 431 | return 0; |
74c9c0c1 | 432 | |
1da177e4 LT |
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; | |
68ad546a | 450 | e = entry0 + pos + size; |
f24e230d FW |
451 | if (pos + size >= newinfo->size) |
452 | return 0; | |
1da177e4 LT |
453 | e->counters.pcnt = pos; |
454 | pos += size; | |
455 | } else { | |
456 | int newpos = t->verdict; | |
457 | ||
458 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 459 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 460 | newpos >= 0) { |
1da177e4 | 461 | /* This a jump; chase it. */ |
f4dc7771 FW |
462 | if (!xt_find_jump_offset(offsets, newpos, |
463 | newinfo->number)) | |
464 | return 0; | |
68ad546a | 465 | e = entry0 + newpos; |
1da177e4 LT |
466 | } else { |
467 | /* ... this is a fallthru */ | |
468 | newpos = pos + e->next_offset; | |
f24e230d FW |
469 | if (newpos >= newinfo->size) |
470 | return 0; | |
1da177e4 | 471 | } |
68ad546a | 472 | e = entry0 + newpos; |
1da177e4 LT |
473 | e->counters.pcnt = pos; |
474 | pos = newpos; | |
475 | } | |
476 | } | |
d7cdf816 | 477 | next: ; |
1da177e4 LT |
478 | } |
479 | return 1; | |
480 | } | |
481 | ||
87a2e70d | 482 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 483 | { |
6be3d859 JE |
484 | struct xt_mtdtor_param par; |
485 | ||
f54e9367 | 486 | par.net = net; |
6be3d859 JE |
487 | par.match = m->u.kernel.match; |
488 | par.matchinfo = m->data; | |
916a917d | 489 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
490 | if (par.match->destroy != NULL) |
491 | par.match->destroy(&par); | |
492 | module_put(par.match->me); | |
1da177e4 LT |
493 | } |
494 | ||
87a2e70d | 495 | static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
f173c8a1 | 496 | { |
9b4fce7a | 497 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 | 498 | |
9b4fce7a JE |
499 | par->match = m->u.kernel.match; |
500 | par->matchinfo = m->data; | |
501 | ||
d7cdf816 PNA |
502 | return xt_check_match(par, m->u.match_size - sizeof(*m), |
503 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); | |
f173c8a1 PM |
504 | } |
505 | ||
022748a9 | 506 | static int |
87a2e70d | 507 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 508 | { |
6709dbbb | 509 | struct xt_match *match; |
3cdc7c95 | 510 | int ret; |
1da177e4 | 511 | |
fd0ec0e6 JE |
512 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
513 | m->u.user.revision); | |
d7cdf816 | 514 | if (IS_ERR(match)) |
fd0ec0e6 | 515 | return PTR_ERR(match); |
d7cdf816 | 516 | |
1da177e4 | 517 | m->u.kernel.match = match; |
1da177e4 | 518 | |
6bdb331b | 519 | ret = check_match(m, par); |
3cdc7c95 PM |
520 | if (ret) |
521 | goto err; | |
522 | ||
1da177e4 | 523 | return 0; |
3cdc7c95 PM |
524 | err: |
525 | module_put(m->u.kernel.match->me); | |
526 | return ret; | |
1da177e4 LT |
527 | } |
528 | ||
add67461 | 529 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 530 | { |
87a2e70d | 531 | struct xt_entry_target *t = ip6t_get_target(e); |
af5d6dc2 | 532 | struct xt_tgchk_param par = { |
add67461 | 533 | .net = net, |
af5d6dc2 JE |
534 | .table = name, |
535 | .entryinfo = e, | |
536 | .target = t->u.kernel.target, | |
537 | .targinfo = t->data, | |
538 | .hook_mask = e->comefrom, | |
916a917d | 539 | .family = NFPROTO_IPV6, |
af5d6dc2 | 540 | }; |
1da177e4 | 541 | |
f173c8a1 | 542 | t = ip6t_get_target(e); |
d7cdf816 PNA |
543 | return xt_check_target(&par, t->u.target_size - sizeof(*t), |
544 | e->ipv6.proto, | |
545 | e->ipv6.invflags & IP6T_INV_PROTO); | |
f173c8a1 | 546 | } |
1da177e4 | 547 | |
022748a9 | 548 | static int |
a83d8e8d | 549 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
ae0ac0ed FW |
550 | unsigned int size, |
551 | struct xt_percpu_counter_alloc_state *alloc_state) | |
f173c8a1 | 552 | { |
87a2e70d | 553 | struct xt_entry_target *t; |
f173c8a1 PM |
554 | struct xt_target *target; |
555 | int ret; | |
556 | unsigned int j; | |
9b4fce7a | 557 | struct xt_mtchk_param mtpar; |
dcea992a | 558 | struct xt_entry_match *ematch; |
f173c8a1 | 559 | |
ae0ac0ed | 560 | if (!xt_percpu_counter_alloc(alloc_state, &e->counters)) |
71ae0dff FW |
561 | return -ENOMEM; |
562 | ||
1da177e4 | 563 | j = 0; |
348b32aa | 564 | memset(&mtpar, 0, sizeof(mtpar)); |
a83d8e8d | 565 | mtpar.net = net; |
9b4fce7a JE |
566 | mtpar.table = name; |
567 | mtpar.entryinfo = &e->ipv6; | |
568 | mtpar.hook_mask = e->comefrom; | |
916a917d | 569 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 570 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 571 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 572 | if (ret != 0) |
6bdb331b JE |
573 | goto cleanup_matches; |
574 | ++j; | |
dcea992a | 575 | } |
1da177e4 LT |
576 | |
577 | t = ip6t_get_target(e); | |
d2a7b6ba JE |
578 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
579 | t->u.user.revision); | |
580 | if (IS_ERR(target)) { | |
d2a7b6ba | 581 | ret = PTR_ERR(target); |
1da177e4 LT |
582 | goto cleanup_matches; |
583 | } | |
584 | t->u.kernel.target = target; | |
6b7d31fc | 585 | |
add67461 | 586 | ret = check_target(e, net, name); |
3cdc7c95 PM |
587 | if (ret) |
588 | goto err; | |
1da177e4 | 589 | return 0; |
3cdc7c95 PM |
590 | err: |
591 | module_put(t->u.kernel.target->me); | |
1da177e4 | 592 | cleanup_matches: |
6bdb331b JE |
593 | xt_ematch_foreach(ematch, e) { |
594 | if (j-- == 0) | |
dcea992a | 595 | break; |
6bdb331b JE |
596 | cleanup_match(ematch, net); |
597 | } | |
71ae0dff | 598 | |
4d31eef5 | 599 | xt_percpu_counter_free(&e->counters); |
71ae0dff | 600 | |
1da177e4 LT |
601 | return ret; |
602 | } | |
603 | ||
d5d1baa1 | 604 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 | 605 | { |
87a2e70d | 606 | const struct xt_entry_target *t; |
e2fe35c1 JE |
607 | unsigned int verdict; |
608 | ||
54d83fc7 | 609 | if (!unconditional(e)) |
e2fe35c1 | 610 | return false; |
d5d1baa1 | 611 | t = ip6t_get_target_c(e); |
e2fe35c1 JE |
612 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
613 | return false; | |
87a2e70d | 614 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
615 | verdict = -verdict - 1; |
616 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
617 | } | |
618 | ||
022748a9 | 619 | static int |
1da177e4 | 620 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 621 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
622 | const unsigned char *base, |
623 | const unsigned char *limit, | |
1da177e4 LT |
624 | const unsigned int *hook_entries, |
625 | const unsigned int *underflows, | |
0559518b | 626 | unsigned int valid_hooks) |
1da177e4 LT |
627 | { |
628 | unsigned int h; | |
bdf533de | 629 | int err; |
1da177e4 | 630 | |
3666ed1c | 631 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
6e94e0cf | 632 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit || |
d7cdf816 | 633 | (unsigned char *)e + e->next_offset > limit) |
1da177e4 | 634 | return -EINVAL; |
1da177e4 LT |
635 | |
636 | if (e->next_offset | |
d7cdf816 | 637 | < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) |
1da177e4 | 638 | return -EINVAL; |
1da177e4 | 639 | |
aa412ba2 FW |
640 | if (!ip6_checkentry(&e->ipv6)) |
641 | return -EINVAL; | |
642 | ||
ce683e5f FW |
643 | err = xt_check_entry_offsets(e, e->elems, e->target_offset, |
644 | e->next_offset); | |
bdf533de FW |
645 | if (err) |
646 | return err; | |
647 | ||
1da177e4 | 648 | /* Check hooks & underflows */ |
6e23ae2a | 649 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
650 | if (!(valid_hooks & (1 << h))) |
651 | continue; | |
1da177e4 LT |
652 | if ((unsigned char *)e - base == hook_entries[h]) |
653 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 654 | if ((unsigned char *)e - base == underflows[h]) { |
d7cdf816 | 655 | if (!check_underflow(e)) |
90e7d4ab | 656 | return -EINVAL; |
d7cdf816 | 657 | |
1da177e4 | 658 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 659 | } |
1da177e4 LT |
660 | } |
661 | ||
1da177e4 | 662 | /* Clear counters and comefrom */ |
2e4e6a17 | 663 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 664 | e->comefrom = 0; |
1da177e4 LT |
665 | return 0; |
666 | } | |
667 | ||
0559518b | 668 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
1da177e4 | 669 | { |
a2df1648 | 670 | struct xt_tgdtor_param par; |
87a2e70d | 671 | struct xt_entry_target *t; |
dcea992a | 672 | struct xt_entry_match *ematch; |
1da177e4 | 673 | |
1da177e4 | 674 | /* Cleanup all matches */ |
dcea992a | 675 | xt_ematch_foreach(ematch, e) |
6bdb331b | 676 | cleanup_match(ematch, net); |
1da177e4 | 677 | t = ip6t_get_target(e); |
a2df1648 | 678 | |
add67461 | 679 | par.net = net; |
a2df1648 JE |
680 | par.target = t->u.kernel.target; |
681 | par.targinfo = t->data; | |
916a917d | 682 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
683 | if (par.target->destroy != NULL) |
684 | par.target->destroy(&par); | |
685 | module_put(par.target->me); | |
4d31eef5 | 686 | xt_percpu_counter_free(&e->counters); |
1da177e4 LT |
687 | } |
688 | ||
689 | /* Checks and translates the user-supplied table segment (held in | |
690 | newinfo) */ | |
691 | static int | |
0f234214 | 692 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
cda219c6 | 693 | const struct ip6t_replace *repl) |
1da177e4 | 694 | { |
ae0ac0ed | 695 | struct xt_percpu_counter_alloc_state alloc_state = { 0 }; |
72b2b1dd | 696 | struct ip6t_entry *iter; |
f4dc7771 | 697 | unsigned int *offsets; |
1da177e4 | 698 | unsigned int i; |
72b2b1dd | 699 | int ret = 0; |
1da177e4 | 700 | |
0f234214 JE |
701 | newinfo->size = repl->size; |
702 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
703 | |
704 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 705 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
706 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
707 | newinfo->underflow[i] = 0xFFFFFFFF; | |
708 | } | |
709 | ||
f4dc7771 FW |
710 | offsets = xt_alloc_entry_offsets(newinfo->number); |
711 | if (!offsets) | |
712 | return -ENOMEM; | |
1da177e4 LT |
713 | i = 0; |
714 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
715 | xt_entry_foreach(iter, entry0, newinfo->size) { |
716 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
717 | entry0 + repl->size, |
718 | repl->hook_entry, | |
719 | repl->underflow, | |
720 | repl->valid_hooks); | |
72b2b1dd | 721 | if (ret != 0) |
f4dc7771 FW |
722 | goto out_free; |
723 | if (i < repl->num_entries) | |
724 | offsets[i] = (void *)iter - entry0; | |
0559518b | 725 | ++i; |
98dbbfc3 FW |
726 | if (strcmp(ip6t_get_target(iter)->u.user.name, |
727 | XT_ERROR_TARGET) == 0) | |
728 | ++newinfo->stacksize; | |
72b2b1dd | 729 | } |
1da177e4 | 730 | |
f4dc7771 | 731 | ret = -EINVAL; |
d7cdf816 | 732 | if (i != repl->num_entries) |
f4dc7771 | 733 | goto out_free; |
1da177e4 LT |
734 | |
735 | /* Check hooks all assigned */ | |
6e23ae2a | 736 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 737 | /* Only hooks which are valid */ |
0f234214 | 738 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 | 739 | continue; |
d7cdf816 | 740 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) |
f4dc7771 | 741 | goto out_free; |
d7cdf816 | 742 | if (newinfo->underflow[i] == 0xFFFFFFFF) |
f4dc7771 | 743 | goto out_free; |
1da177e4 LT |
744 | } |
745 | ||
f4dc7771 FW |
746 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) { |
747 | ret = -ELOOP; | |
748 | goto out_free; | |
749 | } | |
750 | kvfree(offsets); | |
74c9c0c1 | 751 | |
1da177e4 LT |
752 | /* Finally, each sanity check must pass */ |
753 | i = 0; | |
72b2b1dd | 754 | xt_entry_foreach(iter, entry0, newinfo->size) { |
ae0ac0ed FW |
755 | ret = find_check_entry(iter, net, repl->name, repl->size, |
756 | &alloc_state); | |
72b2b1dd JE |
757 | if (ret != 0) |
758 | break; | |
0559518b | 759 | ++i; |
72b2b1dd | 760 | } |
1da177e4 | 761 | |
74c9c0c1 | 762 | if (ret != 0) { |
0559518b JE |
763 | xt_entry_foreach(iter, entry0, newinfo->size) { |
764 | if (i-- == 0) | |
72b2b1dd | 765 | break; |
0559518b JE |
766 | cleanup_entry(iter, net); |
767 | } | |
74c9c0c1 DM |
768 | return ret; |
769 | } | |
1da177e4 | 770 | |
f4dc7771 FW |
771 | return ret; |
772 | out_free: | |
773 | kvfree(offsets); | |
9c547959 | 774 | return ret; |
1da177e4 LT |
775 | } |
776 | ||
1da177e4 | 777 | static void |
2e4e6a17 HW |
778 | get_counters(const struct xt_table_info *t, |
779 | struct xt_counters counters[]) | |
1da177e4 | 780 | { |
72b2b1dd | 781 | struct ip6t_entry *iter; |
1da177e4 LT |
782 | unsigned int cpu; |
783 | unsigned int i; | |
784 | ||
6f912042 | 785 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 786 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 787 | |
1da177e4 | 788 | i = 0; |
482cfc31 | 789 | xt_entry_foreach(iter, t->entries, t->size) { |
71ae0dff | 790 | struct xt_counters *tmp; |
83723d60 ED |
791 | u64 bcnt, pcnt; |
792 | unsigned int start; | |
793 | ||
71ae0dff | 794 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
83723d60 | 795 | do { |
7f5c6d4f | 796 | start = read_seqcount_begin(s); |
71ae0dff FW |
797 | bcnt = tmp->bcnt; |
798 | pcnt = tmp->pcnt; | |
7f5c6d4f | 799 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
800 | |
801 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b | 802 | ++i; |
a5d7a714 | 803 | cond_resched(); |
0559518b | 804 | } |
1da177e4 | 805 | } |
78454473 SH |
806 | } |
807 | ||
d5d1baa1 | 808 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 809 | { |
ed1a6f5e | 810 | unsigned int countersize; |
2e4e6a17 | 811 | struct xt_counters *counters; |
d5d1baa1 | 812 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
813 | |
814 | /* We need atomic snapshot of counters: rest doesn't change | |
815 | (other than comefrom, which userspace doesn't care | |
816 | about). */ | |
2e4e6a17 | 817 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 818 | counters = vzalloc(countersize); |
1da177e4 LT |
819 | |
820 | if (counters == NULL) | |
942e4a2b | 821 | return ERR_PTR(-ENOMEM); |
78454473 | 822 | |
942e4a2b | 823 | get_counters(private, counters); |
78454473 | 824 | |
49a88d18 | 825 | return counters; |
ed1a6f5e PM |
826 | } |
827 | ||
828 | static int | |
829 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 830 | const struct xt_table *table, |
ed1a6f5e PM |
831 | void __user *userptr) |
832 | { | |
833 | unsigned int off, num; | |
d5d1baa1 | 834 | const struct ip6t_entry *e; |
ed1a6f5e | 835 | struct xt_counters *counters; |
5452e425 | 836 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 837 | int ret = 0; |
711bdde6 | 838 | const void *loc_cpu_entry; |
ed1a6f5e PM |
839 | |
840 | counters = alloc_counters(table); | |
841 | if (IS_ERR(counters)) | |
842 | return PTR_ERR(counters); | |
843 | ||
482cfc31 | 844 | loc_cpu_entry = private->entries; |
1da177e4 LT |
845 | |
846 | /* FIXME: use iterator macros --RR */ | |
847 | /* ... then go back and fix counters and names */ | |
848 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
849 | unsigned int i; | |
87a2e70d JE |
850 | const struct xt_entry_match *m; |
851 | const struct xt_entry_target *t; | |
1da177e4 | 852 | |
68ad546a | 853 | e = loc_cpu_entry + off; |
e47ddb2c WB |
854 | if (copy_to_user(userptr + off, e, sizeof(*e))) { |
855 | ret = -EFAULT; | |
856 | goto free_counters; | |
857 | } | |
1da177e4 LT |
858 | if (copy_to_user(userptr + off |
859 | + offsetof(struct ip6t_entry, counters), | |
860 | &counters[num], | |
861 | sizeof(counters[num])) != 0) { | |
862 | ret = -EFAULT; | |
863 | goto free_counters; | |
864 | } | |
865 | ||
866 | for (i = sizeof(struct ip6t_entry); | |
867 | i < e->target_offset; | |
868 | i += m->u.match_size) { | |
869 | m = (void *)e + i; | |
870 | ||
e47ddb2c | 871 | if (xt_match_to_user(m, userptr + off + i)) { |
1da177e4 LT |
872 | ret = -EFAULT; |
873 | goto free_counters; | |
874 | } | |
875 | } | |
876 | ||
d5d1baa1 | 877 | t = ip6t_get_target_c(e); |
e47ddb2c | 878 | if (xt_target_to_user(t, userptr + off + e->target_offset)) { |
1da177e4 LT |
879 | ret = -EFAULT; |
880 | goto free_counters; | |
881 | } | |
882 | } | |
883 | ||
884 | free_counters: | |
885 | vfree(counters); | |
886 | return ret; | |
887 | } | |
888 | ||
3bc3fe5e | 889 | #ifdef CONFIG_COMPAT |
739674fb | 890 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
891 | { |
892 | int v = *(compat_int_t *)src; | |
893 | ||
894 | if (v > 0) | |
895 | v += xt_compat_calc_jump(AF_INET6, v); | |
896 | memcpy(dst, &v, sizeof(v)); | |
897 | } | |
898 | ||
739674fb | 899 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
900 | { |
901 | compat_int_t cv = *(int *)src; | |
902 | ||
903 | if (cv > 0) | |
904 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
905 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
906 | } | |
907 | ||
d5d1baa1 | 908 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 909 | const struct xt_table_info *info, |
d5d1baa1 | 910 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 911 | { |
dcea992a | 912 | const struct xt_entry_match *ematch; |
87a2e70d | 913 | const struct xt_entry_target *t; |
3bc3fe5e PM |
914 | unsigned int entry_offset; |
915 | int off, i, ret; | |
916 | ||
917 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
918 | entry_offset = (void *)e - base; | |
dcea992a | 919 | xt_ematch_foreach(ematch, e) |
6bdb331b | 920 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 921 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
922 | off += xt_compat_target_offset(t->u.kernel.target); |
923 | newinfo->size -= off; | |
924 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
925 | if (ret) | |
926 | return ret; | |
927 | ||
928 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
929 | if (info->hook_entry[i] && | |
930 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
931 | newinfo->hook_entry[i] -= off; | |
932 | if (info->underflow[i] && | |
933 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
934 | newinfo->underflow[i] -= off; | |
935 | } | |
936 | return 0; | |
937 | } | |
938 | ||
939 | static int compat_table_info(const struct xt_table_info *info, | |
940 | struct xt_table_info *newinfo) | |
941 | { | |
72b2b1dd | 942 | struct ip6t_entry *iter; |
711bdde6 | 943 | const void *loc_cpu_entry; |
0559518b | 944 | int ret; |
3bc3fe5e PM |
945 | |
946 | if (!newinfo || !info) | |
947 | return -EINVAL; | |
948 | ||
482cfc31 | 949 | /* we dont care about newinfo->entries */ |
3bc3fe5e PM |
950 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
951 | newinfo->initial_entries = 0; | |
482cfc31 | 952 | loc_cpu_entry = info->entries; |
8d92d533 FW |
953 | ret = xt_compat_init_offsets(AF_INET6, info->number); |
954 | if (ret) | |
955 | return ret; | |
72b2b1dd JE |
956 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
957 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
958 | if (ret != 0) | |
0559518b | 959 | return ret; |
72b2b1dd | 960 | } |
0559518b | 961 | return 0; |
3bc3fe5e PM |
962 | } |
963 | #endif | |
964 | ||
d5d1baa1 | 965 | static int get_info(struct net *net, void __user *user, |
cda219c6 | 966 | const int *len, int compat) |
433665c9 | 967 | { |
12b00c2c | 968 | char name[XT_TABLE_MAXNAMELEN]; |
433665c9 PM |
969 | struct xt_table *t; |
970 | int ret; | |
971 | ||
d7cdf816 | 972 | if (*len != sizeof(struct ip6t_getinfo)) |
433665c9 | 973 | return -EINVAL; |
433665c9 PM |
974 | |
975 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
976 | return -EFAULT; | |
977 | ||
12b00c2c | 978 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
3bc3fe5e PM |
979 | #ifdef CONFIG_COMPAT |
980 | if (compat) | |
981 | xt_compat_lock(AF_INET6); | |
982 | #endif | |
336b517f | 983 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 | 984 | "ip6table_%s", name); |
eb1a6bdc | 985 | if (t) { |
433665c9 | 986 | struct ip6t_getinfo info; |
5452e425 | 987 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 988 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
989 | struct xt_table_info tmp; |
990 | ||
3bc3fe5e | 991 | if (compat) { |
3bc3fe5e PM |
992 | ret = compat_table_info(private, &tmp); |
993 | xt_compat_flush_offsets(AF_INET6); | |
994 | private = &tmp; | |
995 | } | |
996 | #endif | |
cccbe5ef | 997 | memset(&info, 0, sizeof(info)); |
433665c9 PM |
998 | info.valid_hooks = t->valid_hooks; |
999 | memcpy(info.hook_entry, private->hook_entry, | |
1000 | sizeof(info.hook_entry)); | |
1001 | memcpy(info.underflow, private->underflow, | |
1002 | sizeof(info.underflow)); | |
1003 | info.num_entries = private->number; | |
1004 | info.size = private->size; | |
b5dd674b | 1005 | strcpy(info.name, name); |
433665c9 PM |
1006 | |
1007 | if (copy_to_user(user, &info, *len) != 0) | |
1008 | ret = -EFAULT; | |
1009 | else | |
1010 | ret = 0; | |
1011 | ||
1012 | xt_table_unlock(t); | |
1013 | module_put(t->me); | |
1014 | } else | |
eb1a6bdc | 1015 | ret = -ENOENT; |
3bc3fe5e PM |
1016 | #ifdef CONFIG_COMPAT |
1017 | if (compat) | |
1018 | xt_compat_unlock(AF_INET6); | |
1019 | #endif | |
433665c9 PM |
1020 | return ret; |
1021 | } | |
1022 | ||
1da177e4 | 1023 | static int |
d5d1baa1 | 1024 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
cda219c6 | 1025 | const int *len) |
1da177e4 LT |
1026 | { |
1027 | int ret; | |
d924357c | 1028 | struct ip6t_get_entries get; |
2e4e6a17 | 1029 | struct xt_table *t; |
1da177e4 | 1030 | |
d7cdf816 | 1031 | if (*len < sizeof(get)) |
d924357c | 1032 | return -EINVAL; |
d924357c PM |
1033 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1034 | return -EFAULT; | |
d7cdf816 | 1035 | if (*len != sizeof(struct ip6t_get_entries) + get.size) |
d924357c | 1036 | return -EINVAL; |
d7cdf816 | 1037 | |
b301f253 | 1038 | get.name[sizeof(get.name) - 1] = '\0'; |
d924357c | 1039 | |
336b517f | 1040 | t = xt_find_table_lock(net, AF_INET6, get.name); |
eb1a6bdc | 1041 | if (t) { |
2e4e6a17 | 1042 | struct xt_table_info *private = t->private; |
d924357c | 1043 | if (get.size == private->size) |
2e4e6a17 | 1044 | ret = copy_entries_to_user(private->size, |
1da177e4 | 1045 | t, uptr->entrytable); |
d7cdf816 | 1046 | else |
544473c1 | 1047 | ret = -EAGAIN; |
d7cdf816 | 1048 | |
6b7d31fc | 1049 | module_put(t->me); |
2e4e6a17 | 1050 | xt_table_unlock(t); |
1da177e4 | 1051 | } else |
eb1a6bdc | 1052 | ret = -ENOENT; |
1da177e4 LT |
1053 | |
1054 | return ret; | |
1055 | } | |
1056 | ||
1057 | static int | |
336b517f | 1058 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1059 | struct xt_table_info *newinfo, unsigned int num_counters, |
1060 | void __user *counters_ptr) | |
1da177e4 LT |
1061 | { |
1062 | int ret; | |
2e4e6a17 | 1063 | struct xt_table *t; |
3bc3fe5e | 1064 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1065 | struct xt_counters *counters; |
72b2b1dd | 1066 | struct ip6t_entry *iter; |
1da177e4 | 1067 | |
3bc3fe5e | 1068 | ret = 0; |
82b68ecd | 1069 | counters = xt_counters_alloc(num_counters); |
1da177e4 LT |
1070 | if (!counters) { |
1071 | ret = -ENOMEM; | |
3bc3fe5e | 1072 | goto out; |
1da177e4 | 1073 | } |
1da177e4 | 1074 | |
336b517f | 1075 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1076 | "ip6table_%s", name); |
eb1a6bdc JL |
1077 | if (!t) { |
1078 | ret = -ENOENT; | |
1da177e4 | 1079 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1080 | } |
1da177e4 LT |
1081 | |
1082 | /* You lied! */ | |
3bc3fe5e | 1083 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1084 | ret = -EINVAL; |
6b7d31fc | 1085 | goto put_module; |
1da177e4 LT |
1086 | } |
1087 | ||
3bc3fe5e | 1088 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1089 | if (!oldinfo) |
1090 | goto put_module; | |
1091 | ||
1092 | /* Update module usage count based on number of rules */ | |
1ab1457c YH |
1093 | if ((oldinfo->number > oldinfo->initial_entries) || |
1094 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1095 | module_put(t->me); |
1096 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1097 | (newinfo->number <= oldinfo->initial_entries)) | |
1098 | module_put(t->me); | |
1099 | ||
942e4a2b | 1100 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1101 | get_counters(oldinfo, counters); |
942e4a2b | 1102 | |
1da177e4 | 1103 | /* Decrease module usage counts and free resource */ |
482cfc31 | 1104 | xt_entry_foreach(iter, oldinfo->entries, oldinfo->size) |
0559518b | 1105 | cleanup_entry(iter, net); |
72b2b1dd | 1106 | |
2e4e6a17 | 1107 | xt_free_table_info(oldinfo); |
3bc3fe5e | 1108 | if (copy_to_user(counters_ptr, counters, |
c58dd2dd TG |
1109 | sizeof(struct xt_counters) * num_counters) != 0) { |
1110 | /* Silent error, can't fail, new table is already in place */ | |
1111 | net_warn_ratelimited("ip6tables: counters copy to user failed while replacing table\n"); | |
1112 | } | |
1da177e4 | 1113 | vfree(counters); |
2e4e6a17 | 1114 | xt_table_unlock(t); |
1da177e4 LT |
1115 | return ret; |
1116 | ||
1117 | put_module: | |
1118 | module_put(t->me); | |
2e4e6a17 | 1119 | xt_table_unlock(t); |
1da177e4 | 1120 | free_newinfo_counters_untrans: |
1da177e4 | 1121 | vfree(counters); |
3bc3fe5e PM |
1122 | out: |
1123 | return ret; | |
1124 | } | |
1125 | ||
1126 | static int | |
d5d1baa1 | 1127 | do_replace(struct net *net, const void __user *user, unsigned int len) |
3bc3fe5e PM |
1128 | { |
1129 | int ret; | |
1130 | struct ip6t_replace tmp; | |
1131 | struct xt_table_info *newinfo; | |
1132 | void *loc_cpu_entry; | |
72b2b1dd | 1133 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1134 | |
1135 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1136 | return -EFAULT; | |
1137 | ||
1138 | /* overflow check */ | |
1139 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1140 | return -ENOMEM; | |
1086bbe9 DJ |
1141 | if (tmp.num_counters == 0) |
1142 | return -EINVAL; | |
1143 | ||
6a8ab060 | 1144 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1145 | |
1146 | newinfo = xt_alloc_table_info(tmp.size); | |
1147 | if (!newinfo) | |
1148 | return -ENOMEM; | |
1149 | ||
482cfc31 | 1150 | loc_cpu_entry = newinfo->entries; |
3bc3fe5e PM |
1151 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1152 | tmp.size) != 0) { | |
1153 | ret = -EFAULT; | |
1154 | goto free_newinfo; | |
1155 | } | |
1156 | ||
0f234214 | 1157 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1158 | if (ret != 0) |
1159 | goto free_newinfo; | |
1160 | ||
336b517f | 1161 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1162 | tmp.num_counters, tmp.counters); |
1163 | if (ret) | |
1164 | goto free_newinfo_untrans; | |
1165 | return 0; | |
1166 | ||
1167 | free_newinfo_untrans: | |
72b2b1dd | 1168 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1169 | cleanup_entry(iter, net); |
1da177e4 | 1170 | free_newinfo: |
2e4e6a17 | 1171 | xt_free_table_info(newinfo); |
1da177e4 LT |
1172 | return ret; |
1173 | } | |
1174 | ||
1da177e4 | 1175 | static int |
d5d1baa1 | 1176 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
336b517f | 1177 | int compat) |
1da177e4 | 1178 | { |
482cfc31 | 1179 | unsigned int i; |
3bc3fe5e PM |
1180 | struct xt_counters_info tmp; |
1181 | struct xt_counters *paddc; | |
2e4e6a17 | 1182 | struct xt_table *t; |
5452e425 | 1183 | const struct xt_table_info *private; |
6b7d31fc | 1184 | int ret = 0; |
72b2b1dd | 1185 | struct ip6t_entry *iter; |
7f5c6d4f | 1186 | unsigned int addend; |
1da177e4 | 1187 | |
d7591f0c FW |
1188 | paddc = xt_copy_counters_from_user(user, len, &tmp, compat); |
1189 | if (IS_ERR(paddc)) | |
1190 | return PTR_ERR(paddc); | |
1191 | t = xt_find_table_lock(net, AF_INET6, tmp.name); | |
eb1a6bdc JL |
1192 | if (!t) { |
1193 | ret = -ENOENT; | |
1da177e4 | 1194 | goto free; |
6b7d31fc | 1195 | } |
1da177e4 | 1196 | |
942e4a2b | 1197 | local_bh_disable(); |
2e4e6a17 | 1198 | private = t->private; |
d7591f0c | 1199 | if (private->number != tmp.num_counters) { |
1da177e4 LT |
1200 | ret = -EINVAL; |
1201 | goto unlock_up_free; | |
1202 | } | |
1203 | ||
1204 | i = 0; | |
7f5c6d4f | 1205 | addend = xt_write_recseq_begin(); |
482cfc31 | 1206 | xt_entry_foreach(iter, private->entries, private->size) { |
71ae0dff FW |
1207 | struct xt_counters *tmp; |
1208 | ||
1209 | tmp = xt_get_this_cpu_counter(&iter->counters); | |
1210 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); | |
0559518b JE |
1211 | ++i; |
1212 | } | |
7f5c6d4f | 1213 | xt_write_recseq_end(addend); |
1da177e4 | 1214 | unlock_up_free: |
942e4a2b | 1215 | local_bh_enable(); |
2e4e6a17 | 1216 | xt_table_unlock(t); |
6b7d31fc | 1217 | module_put(t->me); |
1da177e4 LT |
1218 | free: |
1219 | vfree(paddc); | |
1220 | ||
1221 | return ret; | |
1222 | } | |
1223 | ||
3bc3fe5e PM |
1224 | #ifdef CONFIG_COMPAT |
1225 | struct compat_ip6t_replace { | |
12b00c2c | 1226 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1227 | u32 valid_hooks; |
1228 | u32 num_entries; | |
1229 | u32 size; | |
1230 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1231 | u32 underflow[NF_INET_NUMHOOKS]; | |
1232 | u32 num_counters; | |
87a2e70d | 1233 | compat_uptr_t counters; /* struct xt_counters * */ |
3bc3fe5e PM |
1234 | struct compat_ip6t_entry entries[0]; |
1235 | }; | |
1236 | ||
1237 | static int | |
1238 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1239 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1240 | unsigned int i) |
3bc3fe5e | 1241 | { |
87a2e70d | 1242 | struct xt_entry_target *t; |
3bc3fe5e PM |
1243 | struct compat_ip6t_entry __user *ce; |
1244 | u_int16_t target_offset, next_offset; | |
1245 | compat_uint_t origsize; | |
dcea992a JE |
1246 | const struct xt_entry_match *ematch; |
1247 | int ret = 0; | |
3bc3fe5e | 1248 | |
3bc3fe5e | 1249 | origsize = *size; |
68ad546a | 1250 | ce = *dstptr; |
0559518b JE |
1251 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1252 | copy_to_user(&ce->counters, &counters[i], | |
1253 | sizeof(counters[i])) != 0) | |
1254 | return -EFAULT; | |
3bc3fe5e PM |
1255 | |
1256 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1257 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1258 | ||
dcea992a JE |
1259 | xt_ematch_foreach(ematch, e) { |
1260 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1261 | if (ret != 0) | |
6bdb331b | 1262 | return ret; |
dcea992a | 1263 | } |
3bc3fe5e | 1264 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1265 | t = ip6t_get_target(e); |
1266 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1267 | if (ret) | |
0559518b | 1268 | return ret; |
3bc3fe5e | 1269 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1270 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1271 | put_user(next_offset, &ce->next_offset) != 0) | |
1272 | return -EFAULT; | |
3bc3fe5e | 1273 | return 0; |
3bc3fe5e PM |
1274 | } |
1275 | ||
022748a9 | 1276 | static int |
87a2e70d | 1277 | compat_find_calc_match(struct xt_entry_match *m, |
3bc3fe5e | 1278 | const struct ip6t_ip6 *ipv6, |
6bdb331b | 1279 | int *size) |
3bc3fe5e PM |
1280 | { |
1281 | struct xt_match *match; | |
1282 | ||
fd0ec0e6 JE |
1283 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
1284 | m->u.user.revision); | |
d7cdf816 | 1285 | if (IS_ERR(match)) |
fd0ec0e6 | 1286 | return PTR_ERR(match); |
d7cdf816 | 1287 | |
3bc3fe5e PM |
1288 | m->u.kernel.match = match; |
1289 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1290 | return 0; |
1291 | } | |
1292 | ||
0559518b | 1293 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e | 1294 | { |
87a2e70d | 1295 | struct xt_entry_target *t; |
dcea992a | 1296 | struct xt_entry_match *ematch; |
3bc3fe5e | 1297 | |
3bc3fe5e | 1298 | /* Cleanup all matches */ |
dcea992a | 1299 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1300 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1301 | t = compat_ip6t_get_target(e); |
1302 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1303 | } |
1304 | ||
022748a9 | 1305 | static int |
3bc3fe5e PM |
1306 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1307 | struct xt_table_info *newinfo, | |
1308 | unsigned int *size, | |
d5d1baa1 | 1309 | const unsigned char *base, |
09d96860 | 1310 | const unsigned char *limit) |
3bc3fe5e | 1311 | { |
dcea992a | 1312 | struct xt_entry_match *ematch; |
87a2e70d | 1313 | struct xt_entry_target *t; |
3bc3fe5e PM |
1314 | struct xt_target *target; |
1315 | unsigned int entry_offset; | |
b0a6363c | 1316 | unsigned int j; |
09d96860 | 1317 | int ret, off; |
3bc3fe5e | 1318 | |
3666ed1c | 1319 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
6e94e0cf | 1320 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit || |
d7cdf816 | 1321 | (unsigned char *)e + e->next_offset > limit) |
3bc3fe5e | 1322 | return -EINVAL; |
3bc3fe5e PM |
1323 | |
1324 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
d7cdf816 | 1325 | sizeof(struct compat_xt_entry_target)) |
3bc3fe5e | 1326 | return -EINVAL; |
3bc3fe5e | 1327 | |
aa412ba2 FW |
1328 | if (!ip6_checkentry(&e->ipv6)) |
1329 | return -EINVAL; | |
1330 | ||
ce683e5f | 1331 | ret = xt_compat_check_entry_offsets(e, e->elems, |
fc1221b3 | 1332 | e->target_offset, e->next_offset); |
3bc3fe5e PM |
1333 | if (ret) |
1334 | return ret; | |
1335 | ||
1336 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1337 | entry_offset = (void *)e - (void *)base; | |
1338 | j = 0; | |
dcea992a | 1339 | xt_ematch_foreach(ematch, e) { |
329a0807 | 1340 | ret = compat_find_calc_match(ematch, &e->ipv6, &off); |
dcea992a | 1341 | if (ret != 0) |
6bdb331b JE |
1342 | goto release_matches; |
1343 | ++j; | |
dcea992a | 1344 | } |
3bc3fe5e PM |
1345 | |
1346 | t = compat_ip6t_get_target(e); | |
d2a7b6ba JE |
1347 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
1348 | t->u.user.revision); | |
1349 | if (IS_ERR(target)) { | |
d2a7b6ba | 1350 | ret = PTR_ERR(target); |
3bc3fe5e PM |
1351 | goto release_matches; |
1352 | } | |
1353 | t->u.kernel.target = target; | |
1354 | ||
1355 | off += xt_compat_target_offset(target); | |
1356 | *size += off; | |
1357 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1358 | if (ret) | |
1359 | goto out; | |
1360 | ||
3bc3fe5e PM |
1361 | return 0; |
1362 | ||
1363 | out: | |
1364 | module_put(t->u.kernel.target->me); | |
1365 | release_matches: | |
6bdb331b JE |
1366 | xt_ematch_foreach(ematch, e) { |
1367 | if (j-- == 0) | |
dcea992a | 1368 | break; |
6bdb331b JE |
1369 | module_put(ematch->u.kernel.match->me); |
1370 | } | |
3bc3fe5e PM |
1371 | return ret; |
1372 | } | |
1373 | ||
0188346f | 1374 | static void |
3bc3fe5e | 1375 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, |
329a0807 | 1376 | unsigned int *size, |
3bc3fe5e PM |
1377 | struct xt_table_info *newinfo, unsigned char *base) |
1378 | { | |
87a2e70d | 1379 | struct xt_entry_target *t; |
3bc3fe5e PM |
1380 | struct ip6t_entry *de; |
1381 | unsigned int origsize; | |
0188346f | 1382 | int h; |
dcea992a | 1383 | struct xt_entry_match *ematch; |
3bc3fe5e | 1384 | |
3bc3fe5e | 1385 | origsize = *size; |
68ad546a | 1386 | de = *dstptr; |
3bc3fe5e PM |
1387 | memcpy(de, e, sizeof(struct ip6t_entry)); |
1388 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1389 | ||
1390 | *dstptr += sizeof(struct ip6t_entry); | |
1391 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1392 | ||
0188346f FW |
1393 | xt_ematch_foreach(ematch, e) |
1394 | xt_compat_match_from_user(ematch, dstptr, size); | |
1395 | ||
3bc3fe5e PM |
1396 | de->target_offset = e->target_offset - (origsize - *size); |
1397 | t = compat_ip6t_get_target(e); | |
3bc3fe5e PM |
1398 | xt_compat_target_from_user(t, dstptr, size); |
1399 | ||
1400 | de->next_offset = e->next_offset - (origsize - *size); | |
1401 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1402 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1403 | newinfo->hook_entry[h] -= origsize - *size; | |
1404 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1405 | newinfo->underflow[h] -= origsize - *size; | |
1406 | } | |
3bc3fe5e PM |
1407 | } |
1408 | ||
3bc3fe5e | 1409 | static int |
f54e9367 | 1410 | translate_compat_table(struct net *net, |
3bc3fe5e PM |
1411 | struct xt_table_info **pinfo, |
1412 | void **pentry0, | |
329a0807 | 1413 | const struct compat_ip6t_replace *compatr) |
3bc3fe5e PM |
1414 | { |
1415 | unsigned int i, j; | |
1416 | struct xt_table_info *newinfo, *info; | |
1417 | void *pos, *entry0, *entry1; | |
72b2b1dd | 1418 | struct compat_ip6t_entry *iter0; |
09d96860 | 1419 | struct ip6t_replace repl; |
3bc3fe5e | 1420 | unsigned int size; |
8d92d533 | 1421 | int ret; |
3bc3fe5e PM |
1422 | |
1423 | info = *pinfo; | |
1424 | entry0 = *pentry0; | |
329a0807 FW |
1425 | size = compatr->size; |
1426 | info->number = compatr->num_entries; | |
3bc3fe5e | 1427 | |
3bc3fe5e PM |
1428 | j = 0; |
1429 | xt_compat_lock(AF_INET6); | |
8d92d533 FW |
1430 | ret = xt_compat_init_offsets(AF_INET6, compatr->num_entries); |
1431 | if (ret) | |
1432 | goto out_unlock; | |
3bc3fe5e | 1433 | /* Walk through entries, checking offsets. */ |
329a0807 | 1434 | xt_entry_foreach(iter0, entry0, compatr->size) { |
72b2b1dd | 1435 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
6b4ff2d7 | 1436 | entry0, |
09d96860 | 1437 | entry0 + compatr->size); |
72b2b1dd | 1438 | if (ret != 0) |
0559518b JE |
1439 | goto out_unlock; |
1440 | ++j; | |
72b2b1dd | 1441 | } |
3bc3fe5e PM |
1442 | |
1443 | ret = -EINVAL; | |
d7cdf816 | 1444 | if (j != compatr->num_entries) |
3bc3fe5e | 1445 | goto out_unlock; |
3bc3fe5e | 1446 | |
3bc3fe5e PM |
1447 | ret = -ENOMEM; |
1448 | newinfo = xt_alloc_table_info(size); | |
1449 | if (!newinfo) | |
1450 | goto out_unlock; | |
1451 | ||
329a0807 | 1452 | newinfo->number = compatr->num_entries; |
3bc3fe5e | 1453 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
09d96860 FW |
1454 | newinfo->hook_entry[i] = compatr->hook_entry[i]; |
1455 | newinfo->underflow[i] = compatr->underflow[i]; | |
3bc3fe5e | 1456 | } |
482cfc31 | 1457 | entry1 = newinfo->entries; |
3bc3fe5e | 1458 | pos = entry1; |
09d96860 | 1459 | size = compatr->size; |
0188346f FW |
1460 | xt_entry_foreach(iter0, entry0, compatr->size) |
1461 | compat_copy_entry_from_user(iter0, &pos, &size, | |
1462 | newinfo, entry1); | |
1463 | ||
09d96860 | 1464 | /* all module references in entry0 are now gone. */ |
3bc3fe5e PM |
1465 | xt_compat_flush_offsets(AF_INET6); |
1466 | xt_compat_unlock(AF_INET6); | |
3bc3fe5e | 1467 | |
09d96860 | 1468 | memcpy(&repl, compatr, sizeof(*compatr)); |
3bc3fe5e | 1469 | |
09d96860 FW |
1470 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1471 | repl.hook_entry[i] = newinfo->hook_entry[i]; | |
1472 | repl.underflow[i] = newinfo->underflow[i]; | |
3bc3fe5e PM |
1473 | } |
1474 | ||
09d96860 FW |
1475 | repl.num_counters = 0; |
1476 | repl.counters = NULL; | |
1477 | repl.size = newinfo->size; | |
1478 | ret = translate_table(net, newinfo, entry1, &repl); | |
1479 | if (ret) | |
1480 | goto free_newinfo; | |
1481 | ||
3bc3fe5e PM |
1482 | *pinfo = newinfo; |
1483 | *pentry0 = entry1; | |
1484 | xt_free_table_info(info); | |
1485 | return 0; | |
1486 | ||
1487 | free_newinfo: | |
1488 | xt_free_table_info(newinfo); | |
09d96860 FW |
1489 | return ret; |
1490 | out_unlock: | |
1491 | xt_compat_flush_offsets(AF_INET6); | |
1492 | xt_compat_unlock(AF_INET6); | |
329a0807 | 1493 | xt_entry_foreach(iter0, entry0, compatr->size) { |
0559518b | 1494 | if (j-- == 0) |
72b2b1dd | 1495 | break; |
0559518b JE |
1496 | compat_release_entry(iter0); |
1497 | } | |
3bc3fe5e | 1498 | return ret; |
3bc3fe5e PM |
1499 | } |
1500 | ||
1501 | static int | |
336b517f | 1502 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1503 | { |
1504 | int ret; | |
1505 | struct compat_ip6t_replace tmp; | |
1506 | struct xt_table_info *newinfo; | |
1507 | void *loc_cpu_entry; | |
72b2b1dd | 1508 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1509 | |
1510 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
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; | |
1518 | ||
6a8ab060 | 1519 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1520 | |
1521 | newinfo = xt_alloc_table_info(tmp.size); | |
1522 | if (!newinfo) | |
1523 | return -ENOMEM; | |
1524 | ||
482cfc31 | 1525 | loc_cpu_entry = newinfo->entries; |
3bc3fe5e PM |
1526 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1527 | tmp.size) != 0) { | |
1528 | ret = -EFAULT; | |
1529 | goto free_newinfo; | |
1530 | } | |
1531 | ||
329a0807 | 1532 | ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1533 | if (ret != 0) |
1534 | goto free_newinfo; | |
1535 | ||
336b517f | 1536 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1537 | tmp.num_counters, compat_ptr(tmp.counters)); |
1538 | if (ret) | |
1539 | goto free_newinfo_untrans; | |
1540 | return 0; | |
1541 | ||
1542 | free_newinfo_untrans: | |
72b2b1dd | 1543 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1544 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1545 | free_newinfo: |
1546 | xt_free_table_info(newinfo); | |
1547 | return ret; | |
1548 | } | |
1549 | ||
1550 | static int | |
1551 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1552 | unsigned int len) | |
1553 | { | |
1554 | int ret; | |
1555 | ||
af31f412 | 1556 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1557 | return -EPERM; |
1558 | ||
1559 | switch (cmd) { | |
1560 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1561 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1562 | break; |
1563 | ||
1564 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1565 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1566 | break; |
1567 | ||
1568 | default: | |
3bc3fe5e PM |
1569 | ret = -EINVAL; |
1570 | } | |
1571 | ||
1572 | return ret; | |
1573 | } | |
1574 | ||
1575 | struct compat_ip6t_get_entries { | |
12b00c2c | 1576 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1577 | compat_uint_t size; |
1578 | struct compat_ip6t_entry entrytable[0]; | |
1579 | }; | |
1580 | ||
1581 | static int | |
1582 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1583 | void __user *userptr) | |
1584 | { | |
1585 | struct xt_counters *counters; | |
5452e425 | 1586 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1587 | void __user *pos; |
1588 | unsigned int size; | |
1589 | int ret = 0; | |
3bc3fe5e | 1590 | unsigned int i = 0; |
72b2b1dd | 1591 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1592 | |
1593 | counters = alloc_counters(table); | |
1594 | if (IS_ERR(counters)) | |
1595 | return PTR_ERR(counters); | |
1596 | ||
3bc3fe5e PM |
1597 | pos = userptr; |
1598 | size = total_size; | |
482cfc31 | 1599 | xt_entry_foreach(iter, private->entries, total_size) { |
72b2b1dd | 1600 | ret = compat_copy_entry_to_user(iter, &pos, |
6b4ff2d7 | 1601 | &size, counters, i++); |
72b2b1dd JE |
1602 | if (ret != 0) |
1603 | break; | |
1604 | } | |
3bc3fe5e PM |
1605 | |
1606 | vfree(counters); | |
1607 | return ret; | |
1608 | } | |
1609 | ||
1610 | static int | |
336b517f AD |
1611 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1612 | int *len) | |
3bc3fe5e PM |
1613 | { |
1614 | int ret; | |
1615 | struct compat_ip6t_get_entries get; | |
1616 | struct xt_table *t; | |
1617 | ||
d7cdf816 | 1618 | if (*len < sizeof(get)) |
3bc3fe5e | 1619 | return -EINVAL; |
3bc3fe5e PM |
1620 | |
1621 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1622 | return -EFAULT; | |
1623 | ||
d7cdf816 | 1624 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) |
3bc3fe5e | 1625 | return -EINVAL; |
d7cdf816 | 1626 | |
b301f253 | 1627 | get.name[sizeof(get.name) - 1] = '\0'; |
3bc3fe5e PM |
1628 | |
1629 | xt_compat_lock(AF_INET6); | |
336b517f | 1630 | t = xt_find_table_lock(net, AF_INET6, get.name); |
eb1a6bdc | 1631 | if (t) { |
5452e425 | 1632 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1633 | struct xt_table_info info; |
3bc3fe5e | 1634 | ret = compat_table_info(private, &info); |
d7cdf816 | 1635 | if (!ret && get.size == info.size) |
3bc3fe5e PM |
1636 | ret = compat_copy_entries_to_user(private->size, |
1637 | t, uptr->entrytable); | |
d7cdf816 | 1638 | else if (!ret) |
544473c1 | 1639 | ret = -EAGAIN; |
d7cdf816 | 1640 | |
3bc3fe5e PM |
1641 | xt_compat_flush_offsets(AF_INET6); |
1642 | module_put(t->me); | |
1643 | xt_table_unlock(t); | |
1644 | } else | |
eb1a6bdc | 1645 | ret = -ENOENT; |
3bc3fe5e PM |
1646 | |
1647 | xt_compat_unlock(AF_INET6); | |
1648 | return ret; | |
1649 | } | |
1650 | ||
1651 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
1652 | ||
1653 | static int | |
1654 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1655 | { | |
1656 | int ret; | |
1657 | ||
af31f412 | 1658 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1659 | return -EPERM; |
1660 | ||
1661 | switch (cmd) { | |
1662 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 1663 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1664 | break; |
1665 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 1666 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
1667 | break; |
1668 | default: | |
1669 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
1670 | } | |
1671 | return ret; | |
1672 | } | |
1673 | #endif | |
1674 | ||
1da177e4 LT |
1675 | static int |
1676 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
1677 | { | |
1678 | int ret; | |
1679 | ||
af31f412 | 1680 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1681 | return -EPERM; |
1682 | ||
1683 | switch (cmd) { | |
1684 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1685 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1686 | break; |
1687 | ||
1688 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1689 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
1690 | break; |
1691 | ||
1692 | default: | |
1da177e4 LT |
1693 | ret = -EINVAL; |
1694 | } | |
1695 | ||
1696 | return ret; | |
1697 | } | |
1698 | ||
1699 | static int | |
1700 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1701 | { | |
1702 | int ret; | |
1703 | ||
af31f412 | 1704 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1705 | return -EPERM; |
1706 | ||
1707 | switch (cmd) { | |
433665c9 | 1708 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 1709 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 1710 | break; |
1da177e4 | 1711 | |
d924357c | 1712 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 1713 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 1714 | break; |
1da177e4 | 1715 | |
6b7d31fc HW |
1716 | case IP6T_SO_GET_REVISION_MATCH: |
1717 | case IP6T_SO_GET_REVISION_TARGET: { | |
12b00c2c | 1718 | struct xt_get_revision rev; |
2e4e6a17 | 1719 | int target; |
6b7d31fc HW |
1720 | |
1721 | if (*len != sizeof(rev)) { | |
1722 | ret = -EINVAL; | |
1723 | break; | |
1724 | } | |
1725 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1726 | ret = -EFAULT; | |
1727 | break; | |
1728 | } | |
6a8ab060 | 1729 | rev.name[sizeof(rev.name)-1] = 0; |
6b7d31fc HW |
1730 | |
1731 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 1732 | target = 1; |
6b7d31fc | 1733 | else |
2e4e6a17 | 1734 | target = 0; |
6b7d31fc | 1735 | |
2e4e6a17 HW |
1736 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
1737 | rev.revision, | |
1738 | target, &ret), | |
6b7d31fc HW |
1739 | "ip6t_%s", rev.name); |
1740 | break; | |
1741 | } | |
1742 | ||
1da177e4 | 1743 | default: |
1da177e4 LT |
1744 | ret = -EINVAL; |
1745 | } | |
1746 | ||
1747 | return ret; | |
1748 | } | |
1749 | ||
b9e69e12 FW |
1750 | static void __ip6t_unregister_table(struct net *net, struct xt_table *table) |
1751 | { | |
1752 | struct xt_table_info *private; | |
1753 | void *loc_cpu_entry; | |
1754 | struct module *table_owner = table->me; | |
1755 | struct ip6t_entry *iter; | |
1756 | ||
1757 | private = xt_unregister_table(table); | |
1758 | ||
1759 | /* Decrease module usage counts and free resources */ | |
1760 | loc_cpu_entry = private->entries; | |
1761 | xt_entry_foreach(iter, loc_cpu_entry, private->size) | |
1762 | cleanup_entry(iter, net); | |
1763 | if (private->number > private->initial_entries) | |
1764 | module_put(table_owner); | |
1765 | xt_free_table_info(private); | |
1766 | } | |
1767 | ||
a67dd266 FW |
1768 | int ip6t_register_table(struct net *net, const struct xt_table *table, |
1769 | const struct ip6t_replace *repl, | |
1770 | const struct nf_hook_ops *ops, | |
1771 | struct xt_table **res) | |
1da177e4 LT |
1772 | { |
1773 | int ret; | |
2e4e6a17 | 1774 | struct xt_table_info *newinfo; |
f3c5c1bf | 1775 | struct xt_table_info bootstrap = {0}; |
31836064 | 1776 | void *loc_cpu_entry; |
a98da11d | 1777 | struct xt_table *new_table; |
1da177e4 | 1778 | |
2e4e6a17 | 1779 | newinfo = xt_alloc_table_info(repl->size); |
a67dd266 FW |
1780 | if (!newinfo) |
1781 | return -ENOMEM; | |
1da177e4 | 1782 | |
482cfc31 | 1783 | loc_cpu_entry = newinfo->entries; |
31836064 | 1784 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
1da177e4 | 1785 | |
0f234214 | 1786 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
1787 | if (ret != 0) |
1788 | goto out_free; | |
1da177e4 | 1789 | |
336b517f | 1790 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 1791 | if (IS_ERR(new_table)) { |
44d34e72 AD |
1792 | ret = PTR_ERR(new_table); |
1793 | goto out_free; | |
1da177e4 | 1794 | } |
a67dd266 | 1795 | |
b9e69e12 | 1796 | /* set res now, will see skbs right after nf_register_net_hooks */ |
a67dd266 | 1797 | WRITE_ONCE(*res, new_table); |
b9e69e12 FW |
1798 | |
1799 | ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks)); | |
1800 | if (ret != 0) { | |
1801 | __ip6t_unregister_table(net, new_table); | |
1802 | *res = NULL; | |
1803 | } | |
1804 | ||
a67dd266 | 1805 | return ret; |
1da177e4 | 1806 | |
44d34e72 AD |
1807 | out_free: |
1808 | xt_free_table_info(newinfo); | |
a67dd266 | 1809 | return ret; |
1da177e4 LT |
1810 | } |
1811 | ||
a67dd266 FW |
1812 | void ip6t_unregister_table(struct net *net, struct xt_table *table, |
1813 | const struct nf_hook_ops *ops) | |
1da177e4 | 1814 | { |
b9e69e12 FW |
1815 | nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks)); |
1816 | __ip6t_unregister_table(net, table); | |
1da177e4 LT |
1817 | } |
1818 | ||
1819 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 1820 | static inline bool |
1da177e4 LT |
1821 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
1822 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 1823 | bool invert) |
1da177e4 LT |
1824 | { |
1825 | return (type == test_type && code >= min_code && code <= max_code) | |
1826 | ^ invert; | |
1827 | } | |
1828 | ||
1d93a9cb | 1829 | static bool |
62fc8051 | 1830 | icmp6_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 1831 | { |
5452e425 JE |
1832 | const struct icmp6hdr *ic; |
1833 | struct icmp6hdr _icmph; | |
f7108a20 | 1834 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
1835 | |
1836 | /* Must not be a fragment. */ | |
f7108a20 | 1837 | if (par->fragoff != 0) |
1d93a9cb | 1838 | return false; |
1da177e4 | 1839 | |
f7108a20 | 1840 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
1841 | if (ic == NULL) { |
1842 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
1843 | * can't. Hence, no choice but to drop. |
1844 | */ | |
b4ba2611 | 1845 | par->hotdrop = true; |
1d93a9cb | 1846 | return false; |
1da177e4 LT |
1847 | } |
1848 | ||
1849 | return icmp6_type_code_match(icmpinfo->type, | |
1850 | icmpinfo->code[0], | |
1851 | icmpinfo->code[1], | |
1852 | ic->icmp6_type, ic->icmp6_code, | |
1853 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
1854 | } | |
1855 | ||
1856 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 1857 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 1858 | { |
9b4fce7a | 1859 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 1860 | |
7f939713 | 1861 | /* Must specify no unknown invflags */ |
bd414ee6 | 1862 | return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
1863 | } |
1864 | ||
1865 | /* The built-in targets: standard (NULL) and error. */ | |
4538506b JE |
1866 | static struct xt_target ip6t_builtin_tg[] __read_mostly = { |
1867 | { | |
243bf6e2 | 1868 | .name = XT_STANDARD_TARGET, |
4538506b JE |
1869 | .targetsize = sizeof(int), |
1870 | .family = NFPROTO_IPV6, | |
3bc3fe5e | 1871 | #ifdef CONFIG_COMPAT |
4538506b JE |
1872 | .compatsize = sizeof(compat_int_t), |
1873 | .compat_from_user = compat_standard_from_user, | |
1874 | .compat_to_user = compat_standard_to_user, | |
3bc3fe5e | 1875 | #endif |
4538506b JE |
1876 | }, |
1877 | { | |
243bf6e2 | 1878 | .name = XT_ERROR_TARGET, |
4538506b | 1879 | .target = ip6t_error, |
12b00c2c | 1880 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
1881 | .family = NFPROTO_IPV6, |
1882 | }, | |
1da177e4 LT |
1883 | }; |
1884 | ||
1885 | static struct nf_sockopt_ops ip6t_sockopts = { | |
1886 | .pf = PF_INET6, | |
1887 | .set_optmin = IP6T_BASE_CTL, | |
1888 | .set_optmax = IP6T_SO_SET_MAX+1, | |
1889 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
1890 | #ifdef CONFIG_COMPAT |
1891 | .compat_set = compat_do_ip6t_set_ctl, | |
1892 | #endif | |
1da177e4 LT |
1893 | .get_optmin = IP6T_BASE_CTL, |
1894 | .get_optmax = IP6T_SO_GET_MAX+1, | |
1895 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
1896 | #ifdef CONFIG_COMPAT |
1897 | .compat_get = compat_do_ip6t_get_ctl, | |
1898 | #endif | |
16fcec35 | 1899 | .owner = THIS_MODULE, |
1da177e4 LT |
1900 | }; |
1901 | ||
4538506b JE |
1902 | static struct xt_match ip6t_builtin_mt[] __read_mostly = { |
1903 | { | |
1904 | .name = "icmp6", | |
1905 | .match = icmp6_match, | |
1906 | .matchsize = sizeof(struct ip6t_icmp), | |
1907 | .checkentry = icmp6_checkentry, | |
1908 | .proto = IPPROTO_ICMPV6, | |
1909 | .family = NFPROTO_IPV6, | |
365279b7 | 1910 | .me = THIS_MODULE, |
4538506b | 1911 | }, |
1da177e4 LT |
1912 | }; |
1913 | ||
3cb609d5 AD |
1914 | static int __net_init ip6_tables_net_init(struct net *net) |
1915 | { | |
383ca5b8 | 1916 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
1917 | } |
1918 | ||
1919 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
1920 | { | |
383ca5b8 | 1921 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
1922 | } |
1923 | ||
1924 | static struct pernet_operations ip6_tables_net_ops = { | |
1925 | .init = ip6_tables_net_init, | |
1926 | .exit = ip6_tables_net_exit, | |
1927 | }; | |
1928 | ||
65b4b4e8 | 1929 | static int __init ip6_tables_init(void) |
1da177e4 LT |
1930 | { |
1931 | int ret; | |
1932 | ||
3cb609d5 | 1933 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
1934 | if (ret < 0) |
1935 | goto err1; | |
2e4e6a17 | 1936 | |
25985edc | 1937 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 1938 | ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 PM |
1939 | if (ret < 0) |
1940 | goto err2; | |
4538506b | 1941 | ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 PM |
1942 | if (ret < 0) |
1943 | goto err4; | |
1da177e4 LT |
1944 | |
1945 | /* Register setsockopt */ | |
1946 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
1947 | if (ret < 0) |
1948 | goto err5; | |
1da177e4 | 1949 | |
ff67e4e4 | 1950 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 1951 | return 0; |
0eff66e6 PM |
1952 | |
1953 | err5: | |
4538506b | 1954 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 | 1955 | err4: |
4538506b | 1956 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 | 1957 | err2: |
3cb609d5 | 1958 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
1959 | err1: |
1960 | return ret; | |
1da177e4 LT |
1961 | } |
1962 | ||
65b4b4e8 | 1963 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
1964 | { |
1965 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 1966 | |
4538506b JE |
1967 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
1968 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); | |
3cb609d5 | 1969 | unregister_pernet_subsys(&ip6_tables_net_ops); |
1da177e4 LT |
1970 | } |
1971 | ||
1972 | EXPORT_SYMBOL(ip6t_register_table); | |
1973 | EXPORT_SYMBOL(ip6t_unregister_table); | |
1974 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 1975 | |
65b4b4e8 AM |
1976 | module_init(ip6_tables_init); |
1977 | module_exit(ip6_tables_fini); |