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> |
1da177e4 | 27 | #include <asm/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 | ||
1da177e4 LT |
42 | /*#define DEBUG_IP_FIREWALL*/ |
43 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
44 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
45 | ||
46 | #ifdef DEBUG_IP_FIREWALL | |
ff67e4e4 | 47 | #define dprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
48 | #else |
49 | #define dprintf(format, args...) | |
50 | #endif | |
51 | ||
52 | #ifdef DEBUG_IP_FIREWALL_USER | |
ff67e4e4 | 53 | #define duprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
54 | #else |
55 | #define duprintf(format, args...) | |
56 | #endif | |
57 | ||
58 | #ifdef CONFIG_NETFILTER_DEBUG | |
af567603 | 59 | #define IP_NF_ASSERT(x) WARN_ON(!(x)) |
1da177e4 LT |
60 | #else |
61 | #define IP_NF_ASSERT(x) | |
62 | #endif | |
1da177e4 | 63 | |
1da177e4 LT |
64 | #if 0 |
65 | /* All the better to debug you with... */ | |
66 | #define static | |
67 | #define inline | |
68 | #endif | |
69 | ||
e3eaa991 JE |
70 | void *ip6t_alloc_initial_table(const struct xt_table *info) |
71 | { | |
72 | return xt_alloc_initial_table(ip6t, IP6T); | |
73 | } | |
74 | EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table); | |
75 | ||
6b7d31fc | 76 | /* |
1da177e4 | 77 | We keep a set of rules for each CPU, so we can avoid write-locking |
6b7d31fc HW |
78 | them in the softirq when updating the counters and therefore |
79 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
80 | context stops packets coming through and allows user context to read | |
81 | the counters or update the rules. | |
1da177e4 | 82 | |
1da177e4 LT |
83 | Hence the start of any table is given by get_table() below. */ |
84 | ||
1da177e4 | 85 | /* Returns whether matches rule or not. */ |
022748a9 | 86 | /* Performance critical - called for every packet */ |
1d93a9cb | 87 | static inline bool |
1da177e4 LT |
88 | ip6_packet_match(const struct sk_buff *skb, |
89 | const char *indev, | |
90 | const char *outdev, | |
91 | const struct ip6t_ip6 *ip6info, | |
92 | unsigned int *protoff, | |
cff533ac | 93 | int *fragoff, bool *hotdrop) |
1da177e4 | 94 | { |
1da177e4 | 95 | unsigned long ret; |
0660e03f | 96 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
1da177e4 | 97 | |
e79ec50b | 98 | #define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg))) |
1da177e4 | 99 | |
f2ffd9ee | 100 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
3666ed1c JP |
101 | &ip6info->src), IP6T_INV_SRCIP) || |
102 | FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, | |
103 | &ip6info->dst), IP6T_INV_DSTIP)) { | |
1da177e4 LT |
104 | dprintf("Source or dest mismatch.\n"); |
105 | /* | |
106 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, | |
107 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, | |
108 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); | |
109 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, | |
110 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, | |
111 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ | |
1d93a9cb | 112 | return false; |
1da177e4 LT |
113 | } |
114 | ||
b8dfe498 | 115 | ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask); |
1da177e4 LT |
116 | |
117 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { | |
118 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
119 | indev, ip6info->iniface, | |
544d9b17 | 120 | ip6info->invflags & IP6T_INV_VIA_IN ? " (INV)" : ""); |
1d93a9cb | 121 | return false; |
1da177e4 LT |
122 | } |
123 | ||
b8dfe498 | 124 | ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask); |
1da177e4 LT |
125 | |
126 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { | |
127 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
128 | outdev, ip6info->outiface, | |
544d9b17 | 129 | ip6info->invflags & IP6T_INV_VIA_OUT ? " (INV)" : ""); |
1d93a9cb | 130 | return false; |
1da177e4 LT |
131 | } |
132 | ||
133 | /* ... might want to do something with class and flowlabel here ... */ | |
134 | ||
135 | /* look for the desired protocol header */ | |
4305ae44 | 136 | if (ip6info->flags & IP6T_F_PROTO) { |
b777e0ce PM |
137 | int protohdr; |
138 | unsigned short _frag_off; | |
1da177e4 | 139 | |
84018f55 | 140 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off, NULL); |
51d8b1a6 PM |
141 | if (protohdr < 0) { |
142 | if (_frag_off == 0) | |
cff533ac | 143 | *hotdrop = true; |
1d93a9cb | 144 | return false; |
51d8b1a6 | 145 | } |
b777e0ce | 146 | *fragoff = _frag_off; |
1da177e4 LT |
147 | |
148 | dprintf("Packet protocol %hi ?= %s%hi.\n", | |
1ab1457c | 149 | protohdr, |
1da177e4 LT |
150 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
151 | ip6info->proto); | |
152 | ||
b777e0ce | 153 | if (ip6info->proto == protohdr) { |
4305ae44 | 154 | if (ip6info->invflags & IP6T_INV_PROTO) |
1d93a9cb | 155 | return false; |
4305ae44 | 156 | |
1d93a9cb | 157 | return true; |
1da177e4 LT |
158 | } |
159 | ||
160 | /* We need match for the '-p all', too! */ | |
161 | if ((ip6info->proto != 0) && | |
162 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
1d93a9cb | 163 | return false; |
1da177e4 | 164 | } |
1d93a9cb | 165 | return true; |
1da177e4 LT |
166 | } |
167 | ||
168 | /* should be ip6 safe */ | |
022748a9 | 169 | static bool |
1da177e4 LT |
170 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
171 | { | |
172 | if (ipv6->flags & ~IP6T_F_MASK) { | |
173 | duprintf("Unknown flag bits set: %08X\n", | |
174 | ipv6->flags & ~IP6T_F_MASK); | |
ccb79bdc | 175 | return false; |
1da177e4 LT |
176 | } |
177 | if (ipv6->invflags & ~IP6T_INV_MASK) { | |
178 | duprintf("Unknown invflag bits set: %08X\n", | |
179 | ipv6->invflags & ~IP6T_INV_MASK); | |
ccb79bdc | 180 | return false; |
1da177e4 | 181 | } |
ccb79bdc | 182 | return true; |
1da177e4 LT |
183 | } |
184 | ||
185 | static unsigned int | |
4b560b44 | 186 | ip6t_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 187 | { |
e87cc472 | 188 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
189 | |
190 | return NF_DROP; | |
191 | } | |
192 | ||
1da177e4 | 193 | static inline struct ip6t_entry * |
d5d1baa1 | 194 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
195 | { |
196 | return (struct ip6t_entry *)(base + offset); | |
197 | } | |
198 | ||
ba9dda3a | 199 | /* All zeroes == unconditional rule. */ |
022748a9 | 200 | /* Mildly perf critical (only if packet tracing is on) */ |
54d83fc7 | 201 | static inline bool unconditional(const struct ip6t_entry *e) |
ba9dda3a | 202 | { |
47901dc2 | 203 | static const struct ip6t_ip6 uncond; |
ba9dda3a | 204 | |
54d83fc7 FW |
205 | return e->target_offset == sizeof(struct ip6t_entry) && |
206 | memcmp(&e->ipv6, &uncond, sizeof(uncond)) == 0; | |
ba9dda3a JK |
207 | } |
208 | ||
87a2e70d | 209 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
210 | ip6t_get_target_c(const struct ip6t_entry *e) |
211 | { | |
212 | return ip6t_get_target((struct ip6t_entry *)e); | |
213 | } | |
214 | ||
07a93626 | 215 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
ba9dda3a | 216 | /* This cries for unification! */ |
022748a9 | 217 | static const char *const hooknames[] = { |
6e23ae2a PM |
218 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
219 | [NF_INET_LOCAL_IN] = "INPUT", | |
220 | [NF_INET_FORWARD] = "FORWARD", | |
221 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
222 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
223 | }; |
224 | ||
225 | enum nf_ip_trace_comments { | |
226 | NF_IP6_TRACE_COMMENT_RULE, | |
227 | NF_IP6_TRACE_COMMENT_RETURN, | |
228 | NF_IP6_TRACE_COMMENT_POLICY, | |
229 | }; | |
230 | ||
022748a9 | 231 | static const char *const comments[] = { |
ba9dda3a JK |
232 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
233 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
234 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
235 | }; | |
236 | ||
237 | static struct nf_loginfo trace_loginfo = { | |
238 | .type = NF_LOG_TYPE_LOG, | |
239 | .u = { | |
240 | .log = { | |
a81b2ce8 | 241 | .level = LOGLEVEL_WARNING, |
ba9dda3a JK |
242 | .logflags = NF_LOG_MASK, |
243 | }, | |
244 | }, | |
245 | }; | |
246 | ||
022748a9 | 247 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 248 | static inline int |
d5d1baa1 | 249 | get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e, |
4f2f6f23 JE |
250 | const char *hookname, const char **chainname, |
251 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 252 | { |
87a2e70d | 253 | const struct xt_standard_target *t = (void *)ip6t_get_target_c(s); |
ba9dda3a | 254 | |
243bf6e2 | 255 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
256 | /* Head of user chain: ERROR target with chainname */ |
257 | *chainname = t->target.data; | |
258 | (*rulenum) = 0; | |
259 | } else if (s == e) { | |
260 | (*rulenum)++; | |
261 | ||
54d83fc7 | 262 | if (unconditional(s) && |
3666ed1c | 263 | strcmp(t->target.u.kernel.target->name, |
243bf6e2 | 264 | XT_STANDARD_TARGET) == 0 && |
54d83fc7 | 265 | t->verdict < 0) { |
ba9dda3a JK |
266 | /* Tail of chains: STANDARD target (return/policy) */ |
267 | *comment = *chainname == hookname | |
4f2f6f23 JE |
268 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
269 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
270 | } |
271 | return 1; | |
272 | } else | |
273 | (*rulenum)++; | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
9dff2c96 EB |
278 | static void trace_packet(struct net *net, |
279 | const struct sk_buff *skb, | |
ba9dda3a JK |
280 | unsigned int hook, |
281 | const struct net_device *in, | |
282 | const struct net_device *out, | |
ecb6f85e | 283 | const char *tablename, |
d5d1baa1 JE |
284 | const struct xt_table_info *private, |
285 | const struct ip6t_entry *e) | |
ba9dda3a | 286 | { |
5452e425 | 287 | const struct ip6t_entry *root; |
4f2f6f23 | 288 | const char *hookname, *chainname, *comment; |
72b2b1dd | 289 | const struct ip6t_entry *iter; |
ba9dda3a JK |
290 | unsigned int rulenum = 0; |
291 | ||
482cfc31 | 292 | root = get_entry(private->entries, private->hook_entry[hook]); |
ba9dda3a | 293 | |
4f2f6f23 JE |
294 | hookname = chainname = hooknames[hook]; |
295 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; | |
ba9dda3a | 296 | |
72b2b1dd JE |
297 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
298 | if (get_chainname_rulenum(iter, e, hookname, | |
299 | &chainname, &comment, &rulenum) != 0) | |
300 | break; | |
ba9dda3a | 301 | |
4017a7ee PNA |
302 | nf_log_trace(net, AF_INET6, hook, skb, in, out, &trace_loginfo, |
303 | "TRACE: %s:%s:%s:%u ", | |
304 | tablename, chainname, comment, rulenum); | |
ba9dda3a JK |
305 | } |
306 | #endif | |
307 | ||
6c7941de | 308 | static inline struct ip6t_entry * |
98e86403 JE |
309 | ip6t_next_entry(const struct ip6t_entry *entry) |
310 | { | |
311 | return (void *)entry + entry->next_offset; | |
312 | } | |
313 | ||
1da177e4 LT |
314 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
315 | unsigned int | |
3db05fea | 316 | ip6t_do_table(struct sk_buff *skb, |
8f8a3715 | 317 | const struct nf_hook_state *state, |
fe1cb108 | 318 | struct xt_table *table) |
1da177e4 | 319 | { |
6cb8ff3f | 320 | unsigned int hook = state->hook; |
6b7d31fc | 321 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
322 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
323 | unsigned int verdict = NF_DROP; | |
324 | const char *indev, *outdev; | |
d5d1baa1 | 325 | const void *table_base; |
f3c5c1bf | 326 | struct ip6t_entry *e, **jumpstack; |
7814b6ec | 327 | unsigned int stackidx, cpu; |
d5d1baa1 | 328 | const struct xt_table_info *private; |
de74c169 | 329 | struct xt_action_param acpar; |
7f5c6d4f | 330 | unsigned int addend; |
1da177e4 LT |
331 | |
332 | /* Initialization */ | |
7814b6ec | 333 | stackidx = 0; |
8f8a3715 DM |
334 | indev = state->in ? state->in->name : nulldevname; |
335 | outdev = state->out ? state->out->name : nulldevname; | |
1da177e4 LT |
336 | /* We handle fragments by dealing with the first fragment as |
337 | * if it was a normal packet. All other fragments are treated | |
338 | * normally, except that they will NEVER match rules that ask | |
339 | * things we don't know, ie. tcp syn flag or ports). If the | |
340 | * rule is also a fragment-specific rule, non-fragments won't | |
341 | * match it. */ | |
b4ba2611 | 342 | acpar.hotdrop = false; |
156c196f | 343 | acpar.net = state->net; |
8f8a3715 DM |
344 | acpar.in = state->in; |
345 | acpar.out = state->out; | |
de74c169 JE |
346 | acpar.family = NFPROTO_IPV6; |
347 | acpar.hooknum = hook; | |
1da177e4 | 348 | |
1da177e4 | 349 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
78454473 | 350 | |
7f5c6d4f ED |
351 | local_bh_disable(); |
352 | addend = xt_write_recseq_begin(); | |
942e4a2b | 353 | private = table->private; |
b416c144 WD |
354 | /* |
355 | * Ensure we load private-> members after we've fetched the base | |
356 | * pointer. | |
357 | */ | |
358 | smp_read_barrier_depends(); | |
f3c5c1bf | 359 | cpu = smp_processor_id(); |
482cfc31 | 360 | table_base = private->entries; |
f3c5c1bf | 361 | jumpstack = (struct ip6t_entry **)private->jumpstack[cpu]; |
7814b6ec FW |
362 | |
363 | /* Switch to alternate jumpstack if we're being invoked via TEE. | |
364 | * TEE issues XT_CONTINUE verdict on original skb so we must not | |
365 | * clobber the jumpstack. | |
366 | * | |
367 | * For recursion via REJECT or SYNPROXY the stack will be clobbered | |
368 | * but it is no problem since absolute verdict is issued by these. | |
369 | */ | |
dcebd315 FW |
370 | if (static_key_false(&xt_tee_enabled)) |
371 | jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated); | |
78454473 | 372 | |
2e4e6a17 | 373 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 374 | |
1da177e4 | 375 | do { |
87a2e70d | 376 | const struct xt_entry_target *t; |
dcea992a | 377 | const struct xt_entry_match *ematch; |
71ae0dff | 378 | struct xt_counters *counter; |
a1ff4ac8 | 379 | |
1da177e4 | 380 | IP_NF_ASSERT(e); |
84018f55 | 381 | acpar.thoff = 0; |
a1ff4ac8 | 382 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
b4ba2611 | 383 | &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) { |
dcea992a | 384 | no_match: |
a1ff4ac8 JE |
385 | e = ip6t_next_entry(e); |
386 | continue; | |
387 | } | |
1da177e4 | 388 | |
ef53d702 | 389 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
390 | acpar.match = ematch->u.kernel.match; |
391 | acpar.matchinfo = ematch->data; | |
392 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 393 | goto no_match; |
ef53d702 | 394 | } |
dcea992a | 395 | |
71ae0dff FW |
396 | counter = xt_get_this_cpu_counter(&e->counters); |
397 | ADD_COUNTER(*counter, skb->len, 1); | |
1da177e4 | 398 | |
d5d1baa1 | 399 | t = ip6t_get_target_c(e); |
a1ff4ac8 | 400 | IP_NF_ASSERT(t->u.kernel.target); |
ba9dda3a | 401 | |
07a93626 | 402 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
403 | /* The packet is traced: log it */ |
404 | if (unlikely(skb->nf_trace)) | |
9dff2c96 EB |
405 | trace_packet(state->net, skb, hook, state->in, |
406 | state->out, table->name, private, e); | |
ba9dda3a | 407 | #endif |
a1ff4ac8 JE |
408 | /* Standard target? */ |
409 | if (!t->u.kernel.target->target) { | |
410 | int v; | |
411 | ||
87a2e70d | 412 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
413 | if (v < 0) { |
414 | /* Pop from stack? */ | |
243bf6e2 | 415 | if (v != XT_RETURN) { |
95c96174 | 416 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 417 | break; |
1da177e4 | 418 | } |
7814b6ec | 419 | if (stackidx == 0) |
f3c5c1bf JE |
420 | e = get_entry(table_base, |
421 | private->underflow[hook]); | |
422 | else | |
7814b6ec | 423 | e = ip6t_next_entry(jumpstack[--stackidx]); |
a1ff4ac8 JE |
424 | continue; |
425 | } | |
3666ed1c JP |
426 | if (table_base + v != ip6t_next_entry(e) && |
427 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
7814b6ec | 428 | jumpstack[stackidx++] = e; |
a1ff4ac8 | 429 | } |
1da177e4 | 430 | |
a1ff4ac8 | 431 | e = get_entry(table_base, v); |
7a6b1c46 JE |
432 | continue; |
433 | } | |
434 | ||
de74c169 JE |
435 | acpar.target = t->u.kernel.target; |
436 | acpar.targinfo = t->data; | |
7eb35586 | 437 | |
de74c169 | 438 | verdict = t->u.kernel.target->target(skb, &acpar); |
243bf6e2 | 439 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
440 | e = ip6t_next_entry(e); |
441 | else | |
442 | /* Verdict */ | |
443 | break; | |
b4ba2611 | 444 | } while (!acpar.hotdrop); |
1da177e4 | 445 | |
7695495d IM |
446 | xt_write_recseq_end(addend); |
447 | local_bh_enable(); | |
1da177e4 LT |
448 | |
449 | #ifdef DEBUG_ALLOW_ALL | |
450 | return NF_ACCEPT; | |
451 | #else | |
b4ba2611 | 452 | if (acpar.hotdrop) |
1da177e4 LT |
453 | return NF_DROP; |
454 | else return verdict; | |
455 | #endif | |
456 | } | |
457 | ||
36472341 FW |
458 | static bool find_jump_target(const struct xt_table_info *t, |
459 | const struct ip6t_entry *target) | |
460 | { | |
461 | struct ip6t_entry *iter; | |
462 | ||
463 | xt_entry_foreach(iter, t->entries, t->size) { | |
464 | if (iter == target) | |
465 | return true; | |
466 | } | |
467 | return false; | |
468 | } | |
469 | ||
1da177e4 | 470 | /* Figures out from what hook each rule can be called: returns 0 if |
98dbbfc3 | 471 | there are loops. Puts hook bitmask in comefrom. */ |
1da177e4 | 472 | static int |
98dbbfc3 | 473 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 474 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
475 | { |
476 | unsigned int hook; | |
477 | ||
478 | /* No recursion; use packet counter to save back ptrs (reset | |
479 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 480 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 481 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 482 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
483 | |
484 | if (!(valid_hooks & (1 << hook))) | |
485 | continue; | |
486 | ||
487 | /* Set initial back pointer. */ | |
488 | e->counters.pcnt = pos; | |
489 | ||
490 | for (;;) { | |
87a2e70d | 491 | const struct xt_standard_target *t |
d5d1baa1 | 492 | = (void *)ip6t_get_target_c(e); |
9c547959 | 493 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 494 | |
6e23ae2a | 495 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
654d0fbd | 496 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
497 | hook, pos, e->comefrom); |
498 | return 0; | |
499 | } | |
9c547959 | 500 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
501 | |
502 | /* Unconditional return/END. */ | |
54d83fc7 | 503 | if ((unconditional(e) && |
3666ed1c | 504 | (strcmp(t->target.u.user.name, |
243bf6e2 | 505 | XT_STANDARD_TARGET) == 0) && |
54d83fc7 | 506 | t->verdict < 0) || visited) { |
1da177e4 LT |
507 | unsigned int oldpos, size; |
508 | ||
1f9352ae | 509 | if ((strcmp(t->target.u.user.name, |
243bf6e2 | 510 | XT_STANDARD_TARGET) == 0) && |
1f9352ae | 511 | t->verdict < -NF_MAX_VERDICT - 1) { |
74c9c0c1 DM |
512 | duprintf("mark_source_chains: bad " |
513 | "negative verdict (%i)\n", | |
514 | t->verdict); | |
515 | return 0; | |
516 | } | |
517 | ||
1da177e4 LT |
518 | /* Return: backtrack through the last |
519 | big jump. */ | |
520 | do { | |
6e23ae2a | 521 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
522 | #ifdef DEBUG_IP_FIREWALL_USER |
523 | if (e->comefrom | |
6e23ae2a | 524 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
525 | duprintf("Back unset " |
526 | "on hook %u " | |
527 | "rule %u\n", | |
528 | hook, pos); | |
529 | } | |
530 | #endif | |
531 | oldpos = pos; | |
532 | pos = e->counters.pcnt; | |
533 | e->counters.pcnt = 0; | |
534 | ||
535 | /* We're at the start. */ | |
536 | if (pos == oldpos) | |
537 | goto next; | |
538 | ||
539 | e = (struct ip6t_entry *) | |
31836064 | 540 | (entry0 + pos); |
1da177e4 LT |
541 | } while (oldpos == pos + e->next_offset); |
542 | ||
543 | /* Move along one */ | |
544 | size = e->next_offset; | |
545 | e = (struct ip6t_entry *) | |
31836064 | 546 | (entry0 + pos + size); |
f24e230d FW |
547 | if (pos + size >= newinfo->size) |
548 | return 0; | |
1da177e4 LT |
549 | e->counters.pcnt = pos; |
550 | pos += size; | |
551 | } else { | |
552 | int newpos = t->verdict; | |
553 | ||
554 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 555 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 556 | newpos >= 0) { |
74c9c0c1 DM |
557 | if (newpos > newinfo->size - |
558 | sizeof(struct ip6t_entry)) { | |
559 | duprintf("mark_source_chains: " | |
560 | "bad verdict (%i)\n", | |
561 | newpos); | |
562 | return 0; | |
563 | } | |
1da177e4 LT |
564 | /* This a jump; chase it. */ |
565 | duprintf("Jump rule %u -> %u\n", | |
566 | pos, newpos); | |
36472341 FW |
567 | e = (struct ip6t_entry *) |
568 | (entry0 + newpos); | |
569 | if (!find_jump_target(newinfo, e)) | |
570 | return 0; | |
1da177e4 LT |
571 | } else { |
572 | /* ... this is a fallthru */ | |
573 | newpos = pos + e->next_offset; | |
f24e230d FW |
574 | if (newpos >= newinfo->size) |
575 | return 0; | |
1da177e4 LT |
576 | } |
577 | e = (struct ip6t_entry *) | |
31836064 | 578 | (entry0 + newpos); |
1da177e4 LT |
579 | e->counters.pcnt = pos; |
580 | pos = newpos; | |
581 | } | |
582 | } | |
6ac94619 | 583 | next: |
1da177e4 LT |
584 | duprintf("Finished chain %u\n", hook); |
585 | } | |
586 | return 1; | |
587 | } | |
588 | ||
87a2e70d | 589 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 590 | { |
6be3d859 JE |
591 | struct xt_mtdtor_param par; |
592 | ||
f54e9367 | 593 | par.net = net; |
6be3d859 JE |
594 | par.match = m->u.kernel.match; |
595 | par.matchinfo = m->data; | |
916a917d | 596 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
597 | if (par.match->destroy != NULL) |
598 | par.match->destroy(&par); | |
599 | module_put(par.match->me); | |
1da177e4 LT |
600 | } |
601 | ||
87a2e70d | 602 | static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
f173c8a1 | 603 | { |
9b4fce7a | 604 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
605 | int ret; |
606 | ||
9b4fce7a JE |
607 | par->match = m->u.kernel.match; |
608 | par->matchinfo = m->data; | |
609 | ||
916a917d | 610 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 611 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
367c6790 | 612 | if (ret < 0) { |
f173c8a1 | 613 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 614 | par.match->name); |
367c6790 | 615 | return ret; |
f173c8a1 | 616 | } |
367c6790 | 617 | return 0; |
f173c8a1 PM |
618 | } |
619 | ||
022748a9 | 620 | static int |
87a2e70d | 621 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 622 | { |
6709dbbb | 623 | struct xt_match *match; |
3cdc7c95 | 624 | int ret; |
1da177e4 | 625 | |
fd0ec0e6 JE |
626 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
627 | m->u.user.revision); | |
628 | if (IS_ERR(match)) { | |
f173c8a1 | 629 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 630 | return PTR_ERR(match); |
1da177e4 LT |
631 | } |
632 | m->u.kernel.match = match; | |
1da177e4 | 633 | |
6bdb331b | 634 | ret = check_match(m, par); |
3cdc7c95 PM |
635 | if (ret) |
636 | goto err; | |
637 | ||
1da177e4 | 638 | return 0; |
3cdc7c95 PM |
639 | err: |
640 | module_put(m->u.kernel.match->me); | |
641 | return ret; | |
1da177e4 LT |
642 | } |
643 | ||
add67461 | 644 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 645 | { |
87a2e70d | 646 | struct xt_entry_target *t = ip6t_get_target(e); |
af5d6dc2 | 647 | struct xt_tgchk_param par = { |
add67461 | 648 | .net = net, |
af5d6dc2 JE |
649 | .table = name, |
650 | .entryinfo = e, | |
651 | .target = t->u.kernel.target, | |
652 | .targinfo = t->data, | |
653 | .hook_mask = e->comefrom, | |
916a917d | 654 | .family = NFPROTO_IPV6, |
af5d6dc2 | 655 | }; |
1da177e4 | 656 | int ret; |
1da177e4 | 657 | |
f173c8a1 | 658 | t = ip6t_get_target(e); |
916a917d | 659 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 660 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
367c6790 | 661 | if (ret < 0) { |
f173c8a1 PM |
662 | duprintf("ip_tables: check failed for `%s'.\n", |
663 | t->u.kernel.target->name); | |
367c6790 | 664 | return ret; |
1da177e4 | 665 | } |
367c6790 | 666 | return 0; |
f173c8a1 | 667 | } |
1da177e4 | 668 | |
022748a9 | 669 | static int |
a83d8e8d | 670 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
0559518b | 671 | unsigned int size) |
f173c8a1 | 672 | { |
87a2e70d | 673 | struct xt_entry_target *t; |
f173c8a1 PM |
674 | struct xt_target *target; |
675 | int ret; | |
676 | unsigned int j; | |
9b4fce7a | 677 | struct xt_mtchk_param mtpar; |
dcea992a | 678 | struct xt_entry_match *ematch; |
f173c8a1 | 679 | |
71ae0dff FW |
680 | e->counters.pcnt = xt_percpu_counter_alloc(); |
681 | if (IS_ERR_VALUE(e->counters.pcnt)) | |
682 | return -ENOMEM; | |
683 | ||
1da177e4 | 684 | j = 0; |
a83d8e8d | 685 | mtpar.net = net; |
9b4fce7a JE |
686 | mtpar.table = name; |
687 | mtpar.entryinfo = &e->ipv6; | |
688 | mtpar.hook_mask = e->comefrom; | |
916a917d | 689 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 690 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 691 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 692 | if (ret != 0) |
6bdb331b JE |
693 | goto cleanup_matches; |
694 | ++j; | |
dcea992a | 695 | } |
1da177e4 LT |
696 | |
697 | t = ip6t_get_target(e); | |
d2a7b6ba JE |
698 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
699 | t->u.user.revision); | |
700 | if (IS_ERR(target)) { | |
f173c8a1 | 701 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 702 | ret = PTR_ERR(target); |
1da177e4 LT |
703 | goto cleanup_matches; |
704 | } | |
705 | t->u.kernel.target = target; | |
6b7d31fc | 706 | |
add67461 | 707 | ret = check_target(e, net, name); |
3cdc7c95 PM |
708 | if (ret) |
709 | goto err; | |
1da177e4 | 710 | return 0; |
3cdc7c95 PM |
711 | err: |
712 | module_put(t->u.kernel.target->me); | |
1da177e4 | 713 | cleanup_matches: |
6bdb331b JE |
714 | xt_ematch_foreach(ematch, e) { |
715 | if (j-- == 0) | |
dcea992a | 716 | break; |
6bdb331b JE |
717 | cleanup_match(ematch, net); |
718 | } | |
71ae0dff FW |
719 | |
720 | xt_percpu_counter_free(e->counters.pcnt); | |
721 | ||
1da177e4 LT |
722 | return ret; |
723 | } | |
724 | ||
d5d1baa1 | 725 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 | 726 | { |
87a2e70d | 727 | const struct xt_entry_target *t; |
e2fe35c1 JE |
728 | unsigned int verdict; |
729 | ||
54d83fc7 | 730 | if (!unconditional(e)) |
e2fe35c1 | 731 | return false; |
d5d1baa1 | 732 | t = ip6t_get_target_c(e); |
e2fe35c1 JE |
733 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
734 | return false; | |
87a2e70d | 735 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
736 | verdict = -verdict - 1; |
737 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
738 | } | |
739 | ||
022748a9 | 740 | static int |
1da177e4 | 741 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 742 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
743 | const unsigned char *base, |
744 | const unsigned char *limit, | |
1da177e4 LT |
745 | const unsigned int *hook_entries, |
746 | const unsigned int *underflows, | |
0559518b | 747 | unsigned int valid_hooks) |
1da177e4 LT |
748 | { |
749 | unsigned int h; | |
bdf533de | 750 | int err; |
1da177e4 | 751 | |
3666ed1c | 752 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
6e94e0cf FW |
753 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit || |
754 | (unsigned char *)e + e->next_offset > limit) { | |
1da177e4 LT |
755 | duprintf("Bad offset %p\n", e); |
756 | return -EINVAL; | |
757 | } | |
758 | ||
759 | if (e->next_offset | |
87a2e70d | 760 | < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) { |
1da177e4 LT |
761 | duprintf("checking: element %p size %u\n", |
762 | e, e->next_offset); | |
763 | return -EINVAL; | |
764 | } | |
765 | ||
aa412ba2 FW |
766 | if (!ip6_checkentry(&e->ipv6)) |
767 | return -EINVAL; | |
768 | ||
769 | err = xt_check_entry_offsets(e, e->target_offset, e->next_offset); | |
bdf533de FW |
770 | if (err) |
771 | return err; | |
772 | ||
1da177e4 | 773 | /* Check hooks & underflows */ |
6e23ae2a | 774 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
775 | if (!(valid_hooks & (1 << h))) |
776 | continue; | |
1da177e4 LT |
777 | if ((unsigned char *)e - base == hook_entries[h]) |
778 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 779 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 | 780 | if (!check_underflow(e)) { |
54d83fc7 FW |
781 | pr_debug("Underflows must be unconditional and " |
782 | "use the STANDARD target with " | |
783 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
784 | return -EINVAL; |
785 | } | |
1da177e4 | 786 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 787 | } |
1da177e4 LT |
788 | } |
789 | ||
1da177e4 | 790 | /* Clear counters and comefrom */ |
2e4e6a17 | 791 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 792 | e->comefrom = 0; |
1da177e4 LT |
793 | return 0; |
794 | } | |
795 | ||
0559518b | 796 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
1da177e4 | 797 | { |
a2df1648 | 798 | struct xt_tgdtor_param par; |
87a2e70d | 799 | struct xt_entry_target *t; |
dcea992a | 800 | struct xt_entry_match *ematch; |
1da177e4 | 801 | |
1da177e4 | 802 | /* Cleanup all matches */ |
dcea992a | 803 | xt_ematch_foreach(ematch, e) |
6bdb331b | 804 | cleanup_match(ematch, net); |
1da177e4 | 805 | t = ip6t_get_target(e); |
a2df1648 | 806 | |
add67461 | 807 | par.net = net; |
a2df1648 JE |
808 | par.target = t->u.kernel.target; |
809 | par.targinfo = t->data; | |
916a917d | 810 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
811 | if (par.target->destroy != NULL) |
812 | par.target->destroy(&par); | |
813 | module_put(par.target->me); | |
71ae0dff FW |
814 | |
815 | xt_percpu_counter_free(e->counters.pcnt); | |
1da177e4 LT |
816 | } |
817 | ||
818 | /* Checks and translates the user-supplied table segment (held in | |
819 | newinfo) */ | |
820 | static int | |
0f234214 | 821 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
cda219c6 | 822 | const struct ip6t_replace *repl) |
1da177e4 | 823 | { |
72b2b1dd | 824 | struct ip6t_entry *iter; |
1da177e4 | 825 | unsigned int i; |
72b2b1dd | 826 | int ret = 0; |
1da177e4 | 827 | |
0f234214 JE |
828 | newinfo->size = repl->size; |
829 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
830 | |
831 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 832 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
833 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
834 | newinfo->underflow[i] = 0xFFFFFFFF; | |
835 | } | |
836 | ||
837 | duprintf("translate_table: size %u\n", newinfo->size); | |
838 | i = 0; | |
839 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
840 | xt_entry_foreach(iter, entry0, newinfo->size) { |
841 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
842 | entry0 + repl->size, |
843 | repl->hook_entry, | |
844 | repl->underflow, | |
845 | repl->valid_hooks); | |
72b2b1dd | 846 | if (ret != 0) |
0559518b JE |
847 | return ret; |
848 | ++i; | |
98dbbfc3 FW |
849 | if (strcmp(ip6t_get_target(iter)->u.user.name, |
850 | XT_ERROR_TARGET) == 0) | |
851 | ++newinfo->stacksize; | |
72b2b1dd | 852 | } |
1da177e4 | 853 | |
0f234214 | 854 | if (i != repl->num_entries) { |
1da177e4 | 855 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 856 | i, repl->num_entries); |
1da177e4 LT |
857 | return -EINVAL; |
858 | } | |
859 | ||
860 | /* Check hooks all assigned */ | |
6e23ae2a | 861 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 862 | /* Only hooks which are valid */ |
0f234214 | 863 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
864 | continue; |
865 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
866 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 867 | i, repl->hook_entry[i]); |
1da177e4 LT |
868 | return -EINVAL; |
869 | } | |
870 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
871 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 872 | i, repl->underflow[i]); |
1da177e4 LT |
873 | return -EINVAL; |
874 | } | |
875 | } | |
876 | ||
0f234214 | 877 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
878 | return -ELOOP; |
879 | ||
1da177e4 LT |
880 | /* Finally, each sanity check must pass */ |
881 | i = 0; | |
72b2b1dd | 882 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 883 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
884 | if (ret != 0) |
885 | break; | |
0559518b | 886 | ++i; |
72b2b1dd | 887 | } |
1da177e4 | 888 | |
74c9c0c1 | 889 | if (ret != 0) { |
0559518b JE |
890 | xt_entry_foreach(iter, entry0, newinfo->size) { |
891 | if (i-- == 0) | |
72b2b1dd | 892 | break; |
0559518b JE |
893 | cleanup_entry(iter, net); |
894 | } | |
74c9c0c1 DM |
895 | return ret; |
896 | } | |
1da177e4 | 897 | |
9c547959 | 898 | return ret; |
1da177e4 LT |
899 | } |
900 | ||
1da177e4 | 901 | static void |
2e4e6a17 HW |
902 | get_counters(const struct xt_table_info *t, |
903 | struct xt_counters counters[]) | |
1da177e4 | 904 | { |
72b2b1dd | 905 | struct ip6t_entry *iter; |
1da177e4 LT |
906 | unsigned int cpu; |
907 | unsigned int i; | |
908 | ||
6f912042 | 909 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 910 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 911 | |
1da177e4 | 912 | i = 0; |
482cfc31 | 913 | xt_entry_foreach(iter, t->entries, t->size) { |
71ae0dff | 914 | struct xt_counters *tmp; |
83723d60 ED |
915 | u64 bcnt, pcnt; |
916 | unsigned int start; | |
917 | ||
71ae0dff | 918 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
83723d60 | 919 | do { |
7f5c6d4f | 920 | start = read_seqcount_begin(s); |
71ae0dff FW |
921 | bcnt = tmp->bcnt; |
922 | pcnt = tmp->pcnt; | |
7f5c6d4f | 923 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
924 | |
925 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
926 | ++i; |
927 | } | |
1da177e4 | 928 | } |
78454473 SH |
929 | } |
930 | ||
d5d1baa1 | 931 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 932 | { |
ed1a6f5e | 933 | unsigned int countersize; |
2e4e6a17 | 934 | struct xt_counters *counters; |
d5d1baa1 | 935 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
936 | |
937 | /* We need atomic snapshot of counters: rest doesn't change | |
938 | (other than comefrom, which userspace doesn't care | |
939 | about). */ | |
2e4e6a17 | 940 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 941 | counters = vzalloc(countersize); |
1da177e4 LT |
942 | |
943 | if (counters == NULL) | |
942e4a2b | 944 | return ERR_PTR(-ENOMEM); |
78454473 | 945 | |
942e4a2b | 946 | get_counters(private, counters); |
78454473 | 947 | |
49a88d18 | 948 | return counters; |
ed1a6f5e PM |
949 | } |
950 | ||
951 | static int | |
952 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 953 | const struct xt_table *table, |
ed1a6f5e PM |
954 | void __user *userptr) |
955 | { | |
956 | unsigned int off, num; | |
d5d1baa1 | 957 | const struct ip6t_entry *e; |
ed1a6f5e | 958 | struct xt_counters *counters; |
5452e425 | 959 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 960 | int ret = 0; |
711bdde6 | 961 | const void *loc_cpu_entry; |
ed1a6f5e PM |
962 | |
963 | counters = alloc_counters(table); | |
964 | if (IS_ERR(counters)) | |
965 | return PTR_ERR(counters); | |
966 | ||
482cfc31 | 967 | loc_cpu_entry = private->entries; |
31836064 | 968 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
969 | ret = -EFAULT; |
970 | goto free_counters; | |
971 | } | |
972 | ||
973 | /* FIXME: use iterator macros --RR */ | |
974 | /* ... then go back and fix counters and names */ | |
975 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
976 | unsigned int i; | |
87a2e70d JE |
977 | const struct xt_entry_match *m; |
978 | const struct xt_entry_target *t; | |
1da177e4 | 979 | |
31836064 | 980 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
981 | if (copy_to_user(userptr + off |
982 | + offsetof(struct ip6t_entry, counters), | |
983 | &counters[num], | |
984 | sizeof(counters[num])) != 0) { | |
985 | ret = -EFAULT; | |
986 | goto free_counters; | |
987 | } | |
988 | ||
989 | for (i = sizeof(struct ip6t_entry); | |
990 | i < e->target_offset; | |
991 | i += m->u.match_size) { | |
992 | m = (void *)e + i; | |
993 | ||
994 | if (copy_to_user(userptr + off + i | |
87a2e70d | 995 | + offsetof(struct xt_entry_match, |
1da177e4 LT |
996 | u.user.name), |
997 | m->u.kernel.match->name, | |
998 | strlen(m->u.kernel.match->name)+1) | |
999 | != 0) { | |
1000 | ret = -EFAULT; | |
1001 | goto free_counters; | |
1002 | } | |
1003 | } | |
1004 | ||
d5d1baa1 | 1005 | t = ip6t_get_target_c(e); |
1da177e4 | 1006 | if (copy_to_user(userptr + off + e->target_offset |
87a2e70d | 1007 | + offsetof(struct xt_entry_target, |
1da177e4 LT |
1008 | u.user.name), |
1009 | t->u.kernel.target->name, | |
1010 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1011 | ret = -EFAULT; | |
1012 | goto free_counters; | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | free_counters: | |
1017 | vfree(counters); | |
1018 | return ret; | |
1019 | } | |
1020 | ||
3bc3fe5e | 1021 | #ifdef CONFIG_COMPAT |
739674fb | 1022 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
1023 | { |
1024 | int v = *(compat_int_t *)src; | |
1025 | ||
1026 | if (v > 0) | |
1027 | v += xt_compat_calc_jump(AF_INET6, v); | |
1028 | memcpy(dst, &v, sizeof(v)); | |
1029 | } | |
1030 | ||
739674fb | 1031 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
1032 | { |
1033 | compat_int_t cv = *(int *)src; | |
1034 | ||
1035 | if (cv > 0) | |
1036 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1037 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1038 | } | |
1039 | ||
d5d1baa1 | 1040 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 1041 | const struct xt_table_info *info, |
d5d1baa1 | 1042 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 1043 | { |
dcea992a | 1044 | const struct xt_entry_match *ematch; |
87a2e70d | 1045 | const struct xt_entry_target *t; |
3bc3fe5e PM |
1046 | unsigned int entry_offset; |
1047 | int off, i, ret; | |
1048 | ||
1049 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1050 | entry_offset = (void *)e - base; | |
dcea992a | 1051 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1052 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1053 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
1054 | off += xt_compat_target_offset(t->u.kernel.target); |
1055 | newinfo->size -= off; | |
1056 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1057 | if (ret) | |
1058 | return ret; | |
1059 | ||
1060 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1061 | if (info->hook_entry[i] && | |
1062 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1063 | newinfo->hook_entry[i] -= off; | |
1064 | if (info->underflow[i] && | |
1065 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1066 | newinfo->underflow[i] -= off; | |
1067 | } | |
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | static int compat_table_info(const struct xt_table_info *info, | |
1072 | struct xt_table_info *newinfo) | |
1073 | { | |
72b2b1dd | 1074 | struct ip6t_entry *iter; |
711bdde6 | 1075 | const void *loc_cpu_entry; |
0559518b | 1076 | int ret; |
3bc3fe5e PM |
1077 | |
1078 | if (!newinfo || !info) | |
1079 | return -EINVAL; | |
1080 | ||
482cfc31 | 1081 | /* we dont care about newinfo->entries */ |
3bc3fe5e PM |
1082 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
1083 | newinfo->initial_entries = 0; | |
482cfc31 | 1084 | loc_cpu_entry = info->entries; |
255d0dc3 | 1085 | xt_compat_init_offsets(AF_INET6, info->number); |
72b2b1dd JE |
1086 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1087 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1088 | if (ret != 0) | |
0559518b | 1089 | return ret; |
72b2b1dd | 1090 | } |
0559518b | 1091 | return 0; |
3bc3fe5e PM |
1092 | } |
1093 | #endif | |
1094 | ||
d5d1baa1 | 1095 | static int get_info(struct net *net, void __user *user, |
cda219c6 | 1096 | const int *len, int compat) |
433665c9 | 1097 | { |
12b00c2c | 1098 | char name[XT_TABLE_MAXNAMELEN]; |
433665c9 PM |
1099 | struct xt_table *t; |
1100 | int ret; | |
1101 | ||
1102 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1103 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1104 | sizeof(struct ip6t_getinfo)); |
1105 | return -EINVAL; | |
1106 | } | |
1107 | ||
1108 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1109 | return -EFAULT; | |
1110 | ||
12b00c2c | 1111 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
3bc3fe5e PM |
1112 | #ifdef CONFIG_COMPAT |
1113 | if (compat) | |
1114 | xt_compat_lock(AF_INET6); | |
1115 | #endif | |
336b517f | 1116 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 | 1117 | "ip6table_%s", name); |
0cc8d8df | 1118 | if (!IS_ERR_OR_NULL(t)) { |
433665c9 | 1119 | struct ip6t_getinfo info; |
5452e425 | 1120 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1121 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1122 | struct xt_table_info tmp; |
1123 | ||
3bc3fe5e | 1124 | if (compat) { |
3bc3fe5e PM |
1125 | ret = compat_table_info(private, &tmp); |
1126 | xt_compat_flush_offsets(AF_INET6); | |
1127 | private = &tmp; | |
1128 | } | |
1129 | #endif | |
cccbe5ef | 1130 | memset(&info, 0, sizeof(info)); |
433665c9 PM |
1131 | info.valid_hooks = t->valid_hooks; |
1132 | memcpy(info.hook_entry, private->hook_entry, | |
1133 | sizeof(info.hook_entry)); | |
1134 | memcpy(info.underflow, private->underflow, | |
1135 | sizeof(info.underflow)); | |
1136 | info.num_entries = private->number; | |
1137 | info.size = private->size; | |
b5dd674b | 1138 | strcpy(info.name, name); |
433665c9 PM |
1139 | |
1140 | if (copy_to_user(user, &info, *len) != 0) | |
1141 | ret = -EFAULT; | |
1142 | else | |
1143 | ret = 0; | |
1144 | ||
1145 | xt_table_unlock(t); | |
1146 | module_put(t->me); | |
1147 | } else | |
1148 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1149 | #ifdef CONFIG_COMPAT |
1150 | if (compat) | |
1151 | xt_compat_unlock(AF_INET6); | |
1152 | #endif | |
433665c9 PM |
1153 | return ret; |
1154 | } | |
1155 | ||
1da177e4 | 1156 | static int |
d5d1baa1 | 1157 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
cda219c6 | 1158 | const int *len) |
1da177e4 LT |
1159 | { |
1160 | int ret; | |
d924357c | 1161 | struct ip6t_get_entries get; |
2e4e6a17 | 1162 | struct xt_table *t; |
1da177e4 | 1163 | |
d924357c | 1164 | if (*len < sizeof(get)) { |
c9d8fe13 | 1165 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1166 | return -EINVAL; |
1167 | } | |
1168 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1169 | return -EFAULT; | |
1170 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1171 | duprintf("get_entries: %u != %zu\n", |
1172 | *len, sizeof(get) + get.size); | |
d924357c PM |
1173 | return -EINVAL; |
1174 | } | |
b301f253 | 1175 | get.name[sizeof(get.name) - 1] = '\0'; |
d924357c | 1176 | |
336b517f | 1177 | t = xt_find_table_lock(net, AF_INET6, get.name); |
0cc8d8df | 1178 | if (!IS_ERR_OR_NULL(t)) { |
2e4e6a17 HW |
1179 | struct xt_table_info *private = t->private; |
1180 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1181 | if (get.size == private->size) |
2e4e6a17 | 1182 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1183 | t, uptr->entrytable); |
1184 | else { | |
1185 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1186 | private->size, get.size); |
544473c1 | 1187 | ret = -EAGAIN; |
1da177e4 | 1188 | } |
6b7d31fc | 1189 | module_put(t->me); |
2e4e6a17 | 1190 | xt_table_unlock(t); |
1da177e4 | 1191 | } else |
6b7d31fc | 1192 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1193 | |
1194 | return ret; | |
1195 | } | |
1196 | ||
1197 | static int | |
336b517f | 1198 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1199 | struct xt_table_info *newinfo, unsigned int num_counters, |
1200 | void __user *counters_ptr) | |
1da177e4 LT |
1201 | { |
1202 | int ret; | |
2e4e6a17 | 1203 | struct xt_table *t; |
3bc3fe5e | 1204 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1205 | struct xt_counters *counters; |
72b2b1dd | 1206 | struct ip6t_entry *iter; |
1da177e4 | 1207 | |
3bc3fe5e | 1208 | ret = 0; |
83723d60 | 1209 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
1da177e4 LT |
1210 | if (!counters) { |
1211 | ret = -ENOMEM; | |
3bc3fe5e | 1212 | goto out; |
1da177e4 | 1213 | } |
1da177e4 | 1214 | |
336b517f | 1215 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1216 | "ip6table_%s", name); |
0cc8d8df | 1217 | if (IS_ERR_OR_NULL(t)) { |
6b7d31fc | 1218 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1219 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1220 | } |
1da177e4 LT |
1221 | |
1222 | /* You lied! */ | |
3bc3fe5e | 1223 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1224 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1225 | valid_hooks, t->valid_hooks); |
1da177e4 | 1226 | ret = -EINVAL; |
6b7d31fc | 1227 | goto put_module; |
1da177e4 LT |
1228 | } |
1229 | ||
3bc3fe5e | 1230 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1231 | if (!oldinfo) |
1232 | goto put_module; | |
1233 | ||
1234 | /* Update module usage count based on number of rules */ | |
1235 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1236 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1237 | if ((oldinfo->number > oldinfo->initial_entries) || |
1238 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1239 | module_put(t->me); |
1240 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1241 | (newinfo->number <= oldinfo->initial_entries)) | |
1242 | module_put(t->me); | |
1243 | ||
942e4a2b | 1244 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1245 | get_counters(oldinfo, counters); |
942e4a2b | 1246 | |
1da177e4 | 1247 | /* Decrease module usage counts and free resource */ |
482cfc31 | 1248 | xt_entry_foreach(iter, oldinfo->entries, oldinfo->size) |
0559518b | 1249 | cleanup_entry(iter, net); |
72b2b1dd | 1250 | |
2e4e6a17 | 1251 | xt_free_table_info(oldinfo); |
3bc3fe5e | 1252 | if (copy_to_user(counters_ptr, counters, |
c58dd2dd TG |
1253 | sizeof(struct xt_counters) * num_counters) != 0) { |
1254 | /* Silent error, can't fail, new table is already in place */ | |
1255 | net_warn_ratelimited("ip6tables: counters copy to user failed while replacing table\n"); | |
1256 | } | |
1da177e4 | 1257 | vfree(counters); |
2e4e6a17 | 1258 | xt_table_unlock(t); |
1da177e4 LT |
1259 | return ret; |
1260 | ||
1261 | put_module: | |
1262 | module_put(t->me); | |
2e4e6a17 | 1263 | xt_table_unlock(t); |
1da177e4 | 1264 | free_newinfo_counters_untrans: |
1da177e4 | 1265 | vfree(counters); |
3bc3fe5e PM |
1266 | out: |
1267 | return ret; | |
1268 | } | |
1269 | ||
1270 | static int | |
d5d1baa1 | 1271 | do_replace(struct net *net, const void __user *user, unsigned int len) |
3bc3fe5e PM |
1272 | { |
1273 | int ret; | |
1274 | struct ip6t_replace tmp; | |
1275 | struct xt_table_info *newinfo; | |
1276 | void *loc_cpu_entry; | |
72b2b1dd | 1277 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1278 | |
1279 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1280 | return -EFAULT; | |
1281 | ||
1282 | /* overflow check */ | |
1283 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1284 | return -ENOMEM; | |
1086bbe9 DJ |
1285 | if (tmp.num_counters == 0) |
1286 | return -EINVAL; | |
1287 | ||
6a8ab060 | 1288 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1289 | |
1290 | newinfo = xt_alloc_table_info(tmp.size); | |
1291 | if (!newinfo) | |
1292 | return -ENOMEM; | |
1293 | ||
482cfc31 | 1294 | loc_cpu_entry = newinfo->entries; |
3bc3fe5e PM |
1295 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1296 | tmp.size) != 0) { | |
1297 | ret = -EFAULT; | |
1298 | goto free_newinfo; | |
1299 | } | |
1300 | ||
0f234214 | 1301 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1302 | if (ret != 0) |
1303 | goto free_newinfo; | |
1304 | ||
1305 | duprintf("ip_tables: Translated table\n"); | |
1306 | ||
336b517f | 1307 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1308 | tmp.num_counters, tmp.counters); |
1309 | if (ret) | |
1310 | goto free_newinfo_untrans; | |
1311 | return 0; | |
1312 | ||
1313 | free_newinfo_untrans: | |
72b2b1dd | 1314 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1315 | cleanup_entry(iter, net); |
1da177e4 | 1316 | free_newinfo: |
2e4e6a17 | 1317 | xt_free_table_info(newinfo); |
1da177e4 LT |
1318 | return ret; |
1319 | } | |
1320 | ||
1da177e4 | 1321 | static int |
d5d1baa1 | 1322 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
336b517f | 1323 | int compat) |
1da177e4 | 1324 | { |
482cfc31 | 1325 | unsigned int i; |
3bc3fe5e PM |
1326 | struct xt_counters_info tmp; |
1327 | struct xt_counters *paddc; | |
1328 | unsigned int num_counters; | |
1329 | char *name; | |
1330 | int size; | |
1331 | void *ptmp; | |
2e4e6a17 | 1332 | struct xt_table *t; |
5452e425 | 1333 | const struct xt_table_info *private; |
6b7d31fc | 1334 | int ret = 0; |
72b2b1dd | 1335 | struct ip6t_entry *iter; |
7f5c6d4f | 1336 | unsigned int addend; |
3bc3fe5e PM |
1337 | #ifdef CONFIG_COMPAT |
1338 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1339 | |
3bc3fe5e PM |
1340 | if (compat) { |
1341 | ptmp = &compat_tmp; | |
1342 | size = sizeof(struct compat_xt_counters_info); | |
1343 | } else | |
1344 | #endif | |
1345 | { | |
1346 | ptmp = &tmp; | |
1347 | size = sizeof(struct xt_counters_info); | |
1348 | } | |
1349 | ||
1350 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1351 | return -EFAULT; |
1352 | ||
3bc3fe5e PM |
1353 | #ifdef CONFIG_COMPAT |
1354 | if (compat) { | |
1355 | num_counters = compat_tmp.num_counters; | |
1356 | name = compat_tmp.name; | |
1357 | } else | |
1358 | #endif | |
1359 | { | |
1360 | num_counters = tmp.num_counters; | |
1361 | name = tmp.name; | |
1362 | } | |
1363 | ||
1364 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1365 | return -EINVAL; |
1366 | ||
e12f8e29 | 1367 | paddc = vmalloc(len - size); |
1da177e4 LT |
1368 | if (!paddc) |
1369 | return -ENOMEM; | |
1370 | ||
3bc3fe5e | 1371 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1372 | ret = -EFAULT; |
1373 | goto free; | |
1374 | } | |
1375 | ||
336b517f | 1376 | t = xt_find_table_lock(net, AF_INET6, name); |
0cc8d8df | 1377 | if (IS_ERR_OR_NULL(t)) { |
6b7d31fc | 1378 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1379 | goto free; |
6b7d31fc | 1380 | } |
1da177e4 | 1381 | |
942e4a2b | 1382 | local_bh_disable(); |
2e4e6a17 | 1383 | private = t->private; |
3bc3fe5e | 1384 | if (private->number != num_counters) { |
1da177e4 LT |
1385 | ret = -EINVAL; |
1386 | goto unlock_up_free; | |
1387 | } | |
1388 | ||
1389 | i = 0; | |
7f5c6d4f | 1390 | addend = xt_write_recseq_begin(); |
482cfc31 | 1391 | xt_entry_foreach(iter, private->entries, private->size) { |
71ae0dff FW |
1392 | struct xt_counters *tmp; |
1393 | ||
1394 | tmp = xt_get_this_cpu_counter(&iter->counters); | |
1395 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); | |
0559518b JE |
1396 | ++i; |
1397 | } | |
7f5c6d4f | 1398 | xt_write_recseq_end(addend); |
1da177e4 | 1399 | unlock_up_free: |
942e4a2b | 1400 | local_bh_enable(); |
2e4e6a17 | 1401 | xt_table_unlock(t); |
6b7d31fc | 1402 | module_put(t->me); |
1da177e4 LT |
1403 | free: |
1404 | vfree(paddc); | |
1405 | ||
1406 | return ret; | |
1407 | } | |
1408 | ||
3bc3fe5e PM |
1409 | #ifdef CONFIG_COMPAT |
1410 | struct compat_ip6t_replace { | |
12b00c2c | 1411 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1412 | u32 valid_hooks; |
1413 | u32 num_entries; | |
1414 | u32 size; | |
1415 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1416 | u32 underflow[NF_INET_NUMHOOKS]; | |
1417 | u32 num_counters; | |
87a2e70d | 1418 | compat_uptr_t counters; /* struct xt_counters * */ |
3bc3fe5e PM |
1419 | struct compat_ip6t_entry entries[0]; |
1420 | }; | |
1421 | ||
1422 | static int | |
1423 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1424 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1425 | unsigned int i) |
3bc3fe5e | 1426 | { |
87a2e70d | 1427 | struct xt_entry_target *t; |
3bc3fe5e PM |
1428 | struct compat_ip6t_entry __user *ce; |
1429 | u_int16_t target_offset, next_offset; | |
1430 | compat_uint_t origsize; | |
dcea992a JE |
1431 | const struct xt_entry_match *ematch; |
1432 | int ret = 0; | |
3bc3fe5e | 1433 | |
3bc3fe5e PM |
1434 | origsize = *size; |
1435 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
0559518b JE |
1436 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1437 | copy_to_user(&ce->counters, &counters[i], | |
1438 | sizeof(counters[i])) != 0) | |
1439 | return -EFAULT; | |
3bc3fe5e PM |
1440 | |
1441 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1442 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1443 | ||
dcea992a JE |
1444 | xt_ematch_foreach(ematch, e) { |
1445 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1446 | if (ret != 0) | |
6bdb331b | 1447 | return ret; |
dcea992a | 1448 | } |
3bc3fe5e | 1449 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1450 | t = ip6t_get_target(e); |
1451 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1452 | if (ret) | |
0559518b | 1453 | return ret; |
3bc3fe5e | 1454 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1455 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1456 | put_user(next_offset, &ce->next_offset) != 0) | |
1457 | return -EFAULT; | |
3bc3fe5e | 1458 | return 0; |
3bc3fe5e PM |
1459 | } |
1460 | ||
022748a9 | 1461 | static int |
87a2e70d | 1462 | compat_find_calc_match(struct xt_entry_match *m, |
3bc3fe5e PM |
1463 | const char *name, |
1464 | const struct ip6t_ip6 *ipv6, | |
6bdb331b | 1465 | int *size) |
3bc3fe5e PM |
1466 | { |
1467 | struct xt_match *match; | |
1468 | ||
fd0ec0e6 JE |
1469 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
1470 | m->u.user.revision); | |
1471 | if (IS_ERR(match)) { | |
3bc3fe5e PM |
1472 | duprintf("compat_check_calc_match: `%s' not found\n", |
1473 | m->u.user.name); | |
fd0ec0e6 | 1474 | return PTR_ERR(match); |
3bc3fe5e PM |
1475 | } |
1476 | m->u.kernel.match = match; | |
1477 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1478 | return 0; |
1479 | } | |
1480 | ||
0559518b | 1481 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e | 1482 | { |
87a2e70d | 1483 | struct xt_entry_target *t; |
dcea992a | 1484 | struct xt_entry_match *ematch; |
3bc3fe5e | 1485 | |
3bc3fe5e | 1486 | /* Cleanup all matches */ |
dcea992a | 1487 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1488 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1489 | t = compat_ip6t_get_target(e); |
1490 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1491 | } |
1492 | ||
022748a9 | 1493 | static int |
3bc3fe5e PM |
1494 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1495 | struct xt_table_info *newinfo, | |
1496 | unsigned int *size, | |
d5d1baa1 JE |
1497 | const unsigned char *base, |
1498 | const unsigned char *limit, | |
1499 | const unsigned int *hook_entries, | |
1500 | const unsigned int *underflows, | |
3bc3fe5e PM |
1501 | const char *name) |
1502 | { | |
dcea992a | 1503 | struct xt_entry_match *ematch; |
87a2e70d | 1504 | struct xt_entry_target *t; |
3bc3fe5e PM |
1505 | struct xt_target *target; |
1506 | unsigned int entry_offset; | |
b0a6363c PM |
1507 | unsigned int j; |
1508 | int ret, off, h; | |
3bc3fe5e PM |
1509 | |
1510 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c | 1511 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
6e94e0cf FW |
1512 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit || |
1513 | (unsigned char *)e + e->next_offset > limit) { | |
3bc3fe5e PM |
1514 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1515 | return -EINVAL; | |
1516 | } | |
1517 | ||
1518 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1519 | sizeof(struct compat_xt_entry_target)) { | |
1520 | duprintf("checking: element %p size %u\n", | |
1521 | e, e->next_offset); | |
1522 | return -EINVAL; | |
1523 | } | |
1524 | ||
aa412ba2 FW |
1525 | if (!ip6_checkentry(&e->ipv6)) |
1526 | return -EINVAL; | |
1527 | ||
1528 | ret = xt_check_entry_offsets(e, e->target_offset, e->next_offset); | |
3bc3fe5e PM |
1529 | if (ret) |
1530 | return ret; | |
1531 | ||
1532 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1533 | entry_offset = (void *)e - (void *)base; | |
1534 | j = 0; | |
dcea992a | 1535 | xt_ematch_foreach(ematch, e) { |
2f06550b | 1536 | ret = compat_find_calc_match(ematch, name, &e->ipv6, &off); |
dcea992a | 1537 | if (ret != 0) |
6bdb331b JE |
1538 | goto release_matches; |
1539 | ++j; | |
dcea992a | 1540 | } |
3bc3fe5e PM |
1541 | |
1542 | t = compat_ip6t_get_target(e); | |
d2a7b6ba JE |
1543 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
1544 | t->u.user.revision); | |
1545 | if (IS_ERR(target)) { | |
3bc3fe5e PM |
1546 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
1547 | t->u.user.name); | |
d2a7b6ba | 1548 | ret = PTR_ERR(target); |
3bc3fe5e PM |
1549 | goto release_matches; |
1550 | } | |
1551 | t->u.kernel.target = target; | |
1552 | ||
1553 | off += xt_compat_target_offset(target); | |
1554 | *size += off; | |
1555 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1556 | if (ret) | |
1557 | goto out; | |
1558 | ||
1559 | /* Check hooks & underflows */ | |
1560 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1561 | if ((unsigned char *)e - base == hook_entries[h]) | |
1562 | newinfo->hook_entry[h] = hook_entries[h]; | |
1563 | if ((unsigned char *)e - base == underflows[h]) | |
1564 | newinfo->underflow[h] = underflows[h]; | |
1565 | } | |
1566 | ||
1567 | /* Clear counters and comefrom */ | |
1568 | memset(&e->counters, 0, sizeof(e->counters)); | |
1569 | e->comefrom = 0; | |
3bc3fe5e PM |
1570 | return 0; |
1571 | ||
1572 | out: | |
1573 | module_put(t->u.kernel.target->me); | |
1574 | release_matches: | |
6bdb331b JE |
1575 | xt_ematch_foreach(ematch, e) { |
1576 | if (j-- == 0) | |
dcea992a | 1577 | break; |
6bdb331b JE |
1578 | module_put(ematch->u.kernel.match->me); |
1579 | } | |
3bc3fe5e PM |
1580 | return ret; |
1581 | } | |
1582 | ||
1583 | static int | |
1584 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1585 | unsigned int *size, const char *name, | |
1586 | struct xt_table_info *newinfo, unsigned char *base) | |
1587 | { | |
87a2e70d | 1588 | struct xt_entry_target *t; |
3bc3fe5e PM |
1589 | struct ip6t_entry *de; |
1590 | unsigned int origsize; | |
1591 | int ret, h; | |
dcea992a | 1592 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1593 | |
1594 | ret = 0; | |
1595 | origsize = *size; | |
1596 | de = (struct ip6t_entry *)*dstptr; | |
1597 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1598 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1599 | ||
1600 | *dstptr += sizeof(struct ip6t_entry); | |
1601 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1602 | ||
dcea992a JE |
1603 | xt_ematch_foreach(ematch, e) { |
1604 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1605 | if (ret != 0) | |
6bdb331b | 1606 | return ret; |
dcea992a | 1607 | } |
3bc3fe5e PM |
1608 | de->target_offset = e->target_offset - (origsize - *size); |
1609 | t = compat_ip6t_get_target(e); | |
3bc3fe5e PM |
1610 | xt_compat_target_from_user(t, dstptr, size); |
1611 | ||
1612 | de->next_offset = e->next_offset - (origsize - *size); | |
1613 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1614 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1615 | newinfo->hook_entry[h] -= origsize - *size; | |
1616 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1617 | newinfo->underflow[h] -= origsize - *size; | |
1618 | } | |
1619 | return ret; | |
1620 | } | |
1621 | ||
f54e9367 | 1622 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
0559518b | 1623 | const char *name) |
3bc3fe5e | 1624 | { |
b0a6363c | 1625 | unsigned int j; |
dcea992a | 1626 | int ret = 0; |
9b4fce7a | 1627 | struct xt_mtchk_param mtpar; |
dcea992a | 1628 | struct xt_entry_match *ematch; |
3bc3fe5e | 1629 | |
71ae0dff FW |
1630 | e->counters.pcnt = xt_percpu_counter_alloc(); |
1631 | if (IS_ERR_VALUE(e->counters.pcnt)) | |
1632 | return -ENOMEM; | |
3bc3fe5e | 1633 | j = 0; |
f54e9367 | 1634 | mtpar.net = net; |
9b4fce7a JE |
1635 | mtpar.table = name; |
1636 | mtpar.entryinfo = &e->ipv6; | |
1637 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1638 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 1639 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1640 | ret = check_match(ematch, &mtpar); |
dcea992a | 1641 | if (ret != 0) |
6bdb331b JE |
1642 | goto cleanup_matches; |
1643 | ++j; | |
dcea992a | 1644 | } |
3bc3fe5e | 1645 | |
add67461 | 1646 | ret = check_target(e, net, name); |
3bc3fe5e PM |
1647 | if (ret) |
1648 | goto cleanup_matches; | |
3bc3fe5e PM |
1649 | return 0; |
1650 | ||
1651 | cleanup_matches: | |
6bdb331b JE |
1652 | xt_ematch_foreach(ematch, e) { |
1653 | if (j-- == 0) | |
dcea992a | 1654 | break; |
6bdb331b JE |
1655 | cleanup_match(ematch, net); |
1656 | } | |
71ae0dff FW |
1657 | |
1658 | xt_percpu_counter_free(e->counters.pcnt); | |
1659 | ||
3bc3fe5e PM |
1660 | return ret; |
1661 | } | |
1662 | ||
1663 | static int | |
f54e9367 AD |
1664 | translate_compat_table(struct net *net, |
1665 | const char *name, | |
3bc3fe5e PM |
1666 | unsigned int valid_hooks, |
1667 | struct xt_table_info **pinfo, | |
1668 | void **pentry0, | |
1669 | unsigned int total_size, | |
1670 | unsigned int number, | |
1671 | unsigned int *hook_entries, | |
1672 | unsigned int *underflows) | |
1673 | { | |
1674 | unsigned int i, j; | |
1675 | struct xt_table_info *newinfo, *info; | |
1676 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1677 | struct compat_ip6t_entry *iter0; |
1678 | struct ip6t_entry *iter1; | |
3bc3fe5e | 1679 | unsigned int size; |
72b2b1dd | 1680 | int ret = 0; |
3bc3fe5e PM |
1681 | |
1682 | info = *pinfo; | |
1683 | entry0 = *pentry0; | |
1684 | size = total_size; | |
1685 | info->number = number; | |
1686 | ||
1687 | /* Init all hooks to impossible value. */ | |
1688 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1689 | info->hook_entry[i] = 0xFFFFFFFF; | |
1690 | info->underflow[i] = 0xFFFFFFFF; | |
1691 | } | |
1692 | ||
1693 | duprintf("translate_compat_table: size %u\n", info->size); | |
1694 | j = 0; | |
1695 | xt_compat_lock(AF_INET6); | |
255d0dc3 | 1696 | xt_compat_init_offsets(AF_INET6, number); |
3bc3fe5e | 1697 | /* Walk through entries, checking offsets. */ |
72b2b1dd JE |
1698 | xt_entry_foreach(iter0, entry0, total_size) { |
1699 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1700 | entry0, |
1701 | entry0 + total_size, | |
1702 | hook_entries, | |
1703 | underflows, | |
1704 | name); | |
72b2b1dd | 1705 | if (ret != 0) |
0559518b JE |
1706 | goto out_unlock; |
1707 | ++j; | |
72b2b1dd | 1708 | } |
3bc3fe5e PM |
1709 | |
1710 | ret = -EINVAL; | |
1711 | if (j != number) { | |
1712 | duprintf("translate_compat_table: %u not %u entries\n", | |
1713 | j, number); | |
1714 | goto out_unlock; | |
1715 | } | |
1716 | ||
1717 | /* Check hooks all assigned */ | |
1718 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1719 | /* Only hooks which are valid */ | |
1720 | if (!(valid_hooks & (1 << i))) | |
1721 | continue; | |
1722 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1723 | duprintf("Invalid hook entry %u %u\n", | |
1724 | i, hook_entries[i]); | |
1725 | goto out_unlock; | |
1726 | } | |
1727 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1728 | duprintf("Invalid underflow %u %u\n", | |
1729 | i, underflows[i]); | |
1730 | goto out_unlock; | |
1731 | } | |
1732 | } | |
1733 | ||
1734 | ret = -ENOMEM; | |
1735 | newinfo = xt_alloc_table_info(size); | |
1736 | if (!newinfo) | |
1737 | goto out_unlock; | |
1738 | ||
1739 | newinfo->number = number; | |
1740 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1741 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1742 | newinfo->underflow[i] = info->underflow[i]; | |
1743 | } | |
482cfc31 | 1744 | entry1 = newinfo->entries; |
3bc3fe5e PM |
1745 | pos = entry1; |
1746 | size = total_size; | |
72b2b1dd | 1747 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1748 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1749 | name, newinfo, entry1); | |
72b2b1dd JE |
1750 | if (ret != 0) |
1751 | break; | |
1752 | } | |
3bc3fe5e PM |
1753 | xt_compat_flush_offsets(AF_INET6); |
1754 | xt_compat_unlock(AF_INET6); | |
1755 | if (ret) | |
1756 | goto free_newinfo; | |
1757 | ||
1758 | ret = -ELOOP; | |
1759 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1760 | goto free_newinfo; | |
1761 | ||
1762 | i = 0; | |
72b2b1dd | 1763 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1764 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1765 | if (ret != 0) |
1766 | break; | |
0559518b | 1767 | ++i; |
98dbbfc3 FW |
1768 | if (strcmp(ip6t_get_target(iter1)->u.user.name, |
1769 | XT_ERROR_TARGET) == 0) | |
1770 | ++newinfo->stacksize; | |
72b2b1dd | 1771 | } |
3bc3fe5e | 1772 | if (ret) { |
72b2b1dd JE |
1773 | /* |
1774 | * The first i matches need cleanup_entry (calls ->destroy) | |
1775 | * because they had called ->check already. The other j-i | |
1776 | * entries need only release. | |
1777 | */ | |
1778 | int skip = i; | |
3bc3fe5e | 1779 | j -= i; |
72b2b1dd JE |
1780 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1781 | if (skip-- > 0) | |
1782 | continue; | |
0559518b | 1783 | if (j-- == 0) |
72b2b1dd | 1784 | break; |
0559518b | 1785 | compat_release_entry(iter0); |
72b2b1dd | 1786 | } |
0559518b JE |
1787 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1788 | if (i-- == 0) | |
72b2b1dd | 1789 | break; |
0559518b JE |
1790 | cleanup_entry(iter1, net); |
1791 | } | |
3bc3fe5e PM |
1792 | xt_free_table_info(newinfo); |
1793 | return ret; | |
1794 | } | |
1795 | ||
3bc3fe5e PM |
1796 | *pinfo = newinfo; |
1797 | *pentry0 = entry1; | |
1798 | xt_free_table_info(info); | |
1799 | return 0; | |
1800 | ||
1801 | free_newinfo: | |
1802 | xt_free_table_info(newinfo); | |
1803 | out: | |
0559518b JE |
1804 | xt_entry_foreach(iter0, entry0, total_size) { |
1805 | if (j-- == 0) | |
72b2b1dd | 1806 | break; |
0559518b JE |
1807 | compat_release_entry(iter0); |
1808 | } | |
3bc3fe5e PM |
1809 | return ret; |
1810 | out_unlock: | |
1811 | xt_compat_flush_offsets(AF_INET6); | |
1812 | xt_compat_unlock(AF_INET6); | |
1813 | goto out; | |
1814 | } | |
1815 | ||
1816 | static int | |
336b517f | 1817 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1818 | { |
1819 | int ret; | |
1820 | struct compat_ip6t_replace tmp; | |
1821 | struct xt_table_info *newinfo; | |
1822 | void *loc_cpu_entry; | |
72b2b1dd | 1823 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1824 | |
1825 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1826 | return -EFAULT; | |
1827 | ||
1828 | /* overflow check */ | |
1829 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1830 | return -ENOMEM; | |
1831 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1832 | return -ENOMEM; | |
1086bbe9 DJ |
1833 | if (tmp.num_counters == 0) |
1834 | return -EINVAL; | |
1835 | ||
6a8ab060 | 1836 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1837 | |
1838 | newinfo = xt_alloc_table_info(tmp.size); | |
1839 | if (!newinfo) | |
1840 | return -ENOMEM; | |
1841 | ||
482cfc31 | 1842 | loc_cpu_entry = newinfo->entries; |
3bc3fe5e PM |
1843 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1844 | tmp.size) != 0) { | |
1845 | ret = -EFAULT; | |
1846 | goto free_newinfo; | |
1847 | } | |
1848 | ||
f54e9367 | 1849 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1850 | &newinfo, &loc_cpu_entry, tmp.size, |
1851 | tmp.num_entries, tmp.hook_entry, | |
1852 | tmp.underflow); | |
1853 | if (ret != 0) | |
1854 | goto free_newinfo; | |
1855 | ||
1856 | duprintf("compat_do_replace: Translated table\n"); | |
1857 | ||
336b517f | 1858 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1859 | tmp.num_counters, compat_ptr(tmp.counters)); |
1860 | if (ret) | |
1861 | goto free_newinfo_untrans; | |
1862 | return 0; | |
1863 | ||
1864 | free_newinfo_untrans: | |
72b2b1dd | 1865 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1866 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1867 | free_newinfo: |
1868 | xt_free_table_info(newinfo); | |
1869 | return ret; | |
1870 | } | |
1871 | ||
1872 | static int | |
1873 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1874 | unsigned int len) | |
1875 | { | |
1876 | int ret; | |
1877 | ||
af31f412 | 1878 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1879 | return -EPERM; |
1880 | ||
1881 | switch (cmd) { | |
1882 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1883 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1884 | break; |
1885 | ||
1886 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1887 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1888 | break; |
1889 | ||
1890 | default: | |
1891 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1892 | ret = -EINVAL; | |
1893 | } | |
1894 | ||
1895 | return ret; | |
1896 | } | |
1897 | ||
1898 | struct compat_ip6t_get_entries { | |
12b00c2c | 1899 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1900 | compat_uint_t size; |
1901 | struct compat_ip6t_entry entrytable[0]; | |
1902 | }; | |
1903 | ||
1904 | static int | |
1905 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1906 | void __user *userptr) | |
1907 | { | |
1908 | struct xt_counters *counters; | |
5452e425 | 1909 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1910 | void __user *pos; |
1911 | unsigned int size; | |
1912 | int ret = 0; | |
3bc3fe5e | 1913 | unsigned int i = 0; |
72b2b1dd | 1914 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1915 | |
1916 | counters = alloc_counters(table); | |
1917 | if (IS_ERR(counters)) | |
1918 | return PTR_ERR(counters); | |
1919 | ||
3bc3fe5e PM |
1920 | pos = userptr; |
1921 | size = total_size; | |
482cfc31 | 1922 | xt_entry_foreach(iter, private->entries, total_size) { |
72b2b1dd | 1923 | ret = compat_copy_entry_to_user(iter, &pos, |
6b4ff2d7 | 1924 | &size, counters, i++); |
72b2b1dd JE |
1925 | if (ret != 0) |
1926 | break; | |
1927 | } | |
3bc3fe5e PM |
1928 | |
1929 | vfree(counters); | |
1930 | return ret; | |
1931 | } | |
1932 | ||
1933 | static int | |
336b517f AD |
1934 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1935 | int *len) | |
3bc3fe5e PM |
1936 | { |
1937 | int ret; | |
1938 | struct compat_ip6t_get_entries get; | |
1939 | struct xt_table *t; | |
1940 | ||
1941 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1942 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1943 | return -EINVAL; |
1944 | } | |
1945 | ||
1946 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1947 | return -EFAULT; | |
1948 | ||
1949 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1950 | duprintf("compat_get_entries: %u != %zu\n", |
1951 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1952 | return -EINVAL; |
1953 | } | |
b301f253 | 1954 | get.name[sizeof(get.name) - 1] = '\0'; |
3bc3fe5e PM |
1955 | |
1956 | xt_compat_lock(AF_INET6); | |
336b517f | 1957 | t = xt_find_table_lock(net, AF_INET6, get.name); |
0cc8d8df | 1958 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1959 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1960 | struct xt_table_info info; |
9c547959 | 1961 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1962 | ret = compat_table_info(private, &info); |
1963 | if (!ret && get.size == info.size) { | |
1964 | ret = compat_copy_entries_to_user(private->size, | |
1965 | t, uptr->entrytable); | |
1966 | } else if (!ret) { | |
1967 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1968 | private->size, get.size); |
544473c1 | 1969 | ret = -EAGAIN; |
3bc3fe5e PM |
1970 | } |
1971 | xt_compat_flush_offsets(AF_INET6); | |
1972 | module_put(t->me); | |
1973 | xt_table_unlock(t); | |
1974 | } else | |
1975 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1976 | ||
1977 | xt_compat_unlock(AF_INET6); | |
1978 | return ret; | |
1979 | } | |
1980 | ||
1981 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
1982 | ||
1983 | static int | |
1984 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1985 | { | |
1986 | int ret; | |
1987 | ||
af31f412 | 1988 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1989 | return -EPERM; |
1990 | ||
1991 | switch (cmd) { | |
1992 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 1993 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1994 | break; |
1995 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 1996 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
1997 | break; |
1998 | default: | |
1999 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
2000 | } | |
2001 | return ret; | |
2002 | } | |
2003 | #endif | |
2004 | ||
1da177e4 LT |
2005 | static int |
2006 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2007 | { | |
2008 | int ret; | |
2009 | ||
af31f412 | 2010 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2011 | return -EPERM; |
2012 | ||
2013 | switch (cmd) { | |
2014 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2015 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2016 | break; |
2017 | ||
2018 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2019 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2020 | break; |
2021 | ||
2022 | default: | |
2023 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2024 | ret = -EINVAL; | |
2025 | } | |
2026 | ||
2027 | return ret; | |
2028 | } | |
2029 | ||
2030 | static int | |
2031 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2032 | { | |
2033 | int ret; | |
2034 | ||
af31f412 | 2035 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2036 | return -EPERM; |
2037 | ||
2038 | switch (cmd) { | |
433665c9 | 2039 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2040 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2041 | break; |
1da177e4 | 2042 | |
d924357c | 2043 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2044 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2045 | break; |
1da177e4 | 2046 | |
6b7d31fc HW |
2047 | case IP6T_SO_GET_REVISION_MATCH: |
2048 | case IP6T_SO_GET_REVISION_TARGET: { | |
12b00c2c | 2049 | struct xt_get_revision rev; |
2e4e6a17 | 2050 | int target; |
6b7d31fc HW |
2051 | |
2052 | if (*len != sizeof(rev)) { | |
2053 | ret = -EINVAL; | |
2054 | break; | |
2055 | } | |
2056 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2057 | ret = -EFAULT; | |
2058 | break; | |
2059 | } | |
6a8ab060 | 2060 | rev.name[sizeof(rev.name)-1] = 0; |
6b7d31fc HW |
2061 | |
2062 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2063 | target = 1; |
6b7d31fc | 2064 | else |
2e4e6a17 | 2065 | target = 0; |
6b7d31fc | 2066 | |
2e4e6a17 HW |
2067 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2068 | rev.revision, | |
2069 | target, &ret), | |
6b7d31fc HW |
2070 | "ip6t_%s", rev.name); |
2071 | break; | |
2072 | } | |
2073 | ||
1da177e4 LT |
2074 | default: |
2075 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2076 | ret = -EINVAL; | |
2077 | } | |
2078 | ||
2079 | return ret; | |
2080 | } | |
2081 | ||
b9e69e12 FW |
2082 | static void __ip6t_unregister_table(struct net *net, struct xt_table *table) |
2083 | { | |
2084 | struct xt_table_info *private; | |
2085 | void *loc_cpu_entry; | |
2086 | struct module *table_owner = table->me; | |
2087 | struct ip6t_entry *iter; | |
2088 | ||
2089 | private = xt_unregister_table(table); | |
2090 | ||
2091 | /* Decrease module usage counts and free resources */ | |
2092 | loc_cpu_entry = private->entries; | |
2093 | xt_entry_foreach(iter, loc_cpu_entry, private->size) | |
2094 | cleanup_entry(iter, net); | |
2095 | if (private->number > private->initial_entries) | |
2096 | module_put(table_owner); | |
2097 | xt_free_table_info(private); | |
2098 | } | |
2099 | ||
a67dd266 FW |
2100 | int ip6t_register_table(struct net *net, const struct xt_table *table, |
2101 | const struct ip6t_replace *repl, | |
2102 | const struct nf_hook_ops *ops, | |
2103 | struct xt_table **res) | |
1da177e4 LT |
2104 | { |
2105 | int ret; | |
2e4e6a17 | 2106 | struct xt_table_info *newinfo; |
f3c5c1bf | 2107 | struct xt_table_info bootstrap = {0}; |
31836064 | 2108 | void *loc_cpu_entry; |
a98da11d | 2109 | struct xt_table *new_table; |
1da177e4 | 2110 | |
2e4e6a17 | 2111 | newinfo = xt_alloc_table_info(repl->size); |
a67dd266 FW |
2112 | if (!newinfo) |
2113 | return -ENOMEM; | |
1da177e4 | 2114 | |
482cfc31 | 2115 | loc_cpu_entry = newinfo->entries; |
31836064 | 2116 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
1da177e4 | 2117 | |
0f234214 | 2118 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2119 | if (ret != 0) |
2120 | goto out_free; | |
1da177e4 | 2121 | |
336b517f | 2122 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2123 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2124 | ret = PTR_ERR(new_table); |
2125 | goto out_free; | |
1da177e4 | 2126 | } |
a67dd266 | 2127 | |
b9e69e12 | 2128 | /* set res now, will see skbs right after nf_register_net_hooks */ |
a67dd266 | 2129 | WRITE_ONCE(*res, new_table); |
b9e69e12 FW |
2130 | |
2131 | ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks)); | |
2132 | if (ret != 0) { | |
2133 | __ip6t_unregister_table(net, new_table); | |
2134 | *res = NULL; | |
2135 | } | |
2136 | ||
a67dd266 | 2137 | return ret; |
1da177e4 | 2138 | |
44d34e72 AD |
2139 | out_free: |
2140 | xt_free_table_info(newinfo); | |
a67dd266 | 2141 | return ret; |
1da177e4 LT |
2142 | } |
2143 | ||
a67dd266 FW |
2144 | void ip6t_unregister_table(struct net *net, struct xt_table *table, |
2145 | const struct nf_hook_ops *ops) | |
1da177e4 | 2146 | { |
b9e69e12 FW |
2147 | nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks)); |
2148 | __ip6t_unregister_table(net, table); | |
1da177e4 LT |
2149 | } |
2150 | ||
2151 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2152 | static inline bool |
1da177e4 LT |
2153 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2154 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2155 | bool invert) |
1da177e4 LT |
2156 | { |
2157 | return (type == test_type && code >= min_code && code <= max_code) | |
2158 | ^ invert; | |
2159 | } | |
2160 | ||
1d93a9cb | 2161 | static bool |
62fc8051 | 2162 | icmp6_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2163 | { |
5452e425 JE |
2164 | const struct icmp6hdr *ic; |
2165 | struct icmp6hdr _icmph; | |
f7108a20 | 2166 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2167 | |
2168 | /* Must not be a fragment. */ | |
f7108a20 | 2169 | if (par->fragoff != 0) |
1d93a9cb | 2170 | return false; |
1da177e4 | 2171 | |
f7108a20 | 2172 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2173 | if (ic == NULL) { |
2174 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2175 | * can't. Hence, no choice but to drop. |
2176 | */ | |
1da177e4 | 2177 | duprintf("Dropping evil ICMP tinygram.\n"); |
b4ba2611 | 2178 | par->hotdrop = true; |
1d93a9cb | 2179 | return false; |
1da177e4 LT |
2180 | } |
2181 | ||
2182 | return icmp6_type_code_match(icmpinfo->type, | |
2183 | icmpinfo->code[0], | |
2184 | icmpinfo->code[1], | |
2185 | ic->icmp6_type, ic->icmp6_code, | |
2186 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2187 | } | |
2188 | ||
2189 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 2190 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2191 | { |
9b4fce7a | 2192 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2193 | |
7f939713 | 2194 | /* Must specify no unknown invflags */ |
bd414ee6 | 2195 | return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2196 | } |
2197 | ||
2198 | /* The built-in targets: standard (NULL) and error. */ | |
4538506b JE |
2199 | static struct xt_target ip6t_builtin_tg[] __read_mostly = { |
2200 | { | |
243bf6e2 | 2201 | .name = XT_STANDARD_TARGET, |
4538506b JE |
2202 | .targetsize = sizeof(int), |
2203 | .family = NFPROTO_IPV6, | |
3bc3fe5e | 2204 | #ifdef CONFIG_COMPAT |
4538506b JE |
2205 | .compatsize = sizeof(compat_int_t), |
2206 | .compat_from_user = compat_standard_from_user, | |
2207 | .compat_to_user = compat_standard_to_user, | |
3bc3fe5e | 2208 | #endif |
4538506b JE |
2209 | }, |
2210 | { | |
243bf6e2 | 2211 | .name = XT_ERROR_TARGET, |
4538506b | 2212 | .target = ip6t_error, |
12b00c2c | 2213 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
2214 | .family = NFPROTO_IPV6, |
2215 | }, | |
1da177e4 LT |
2216 | }; |
2217 | ||
2218 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2219 | .pf = PF_INET6, | |
2220 | .set_optmin = IP6T_BASE_CTL, | |
2221 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2222 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2223 | #ifdef CONFIG_COMPAT |
2224 | .compat_set = compat_do_ip6t_set_ctl, | |
2225 | #endif | |
1da177e4 LT |
2226 | .get_optmin = IP6T_BASE_CTL, |
2227 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2228 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2229 | #ifdef CONFIG_COMPAT |
2230 | .compat_get = compat_do_ip6t_get_ctl, | |
2231 | #endif | |
16fcec35 | 2232 | .owner = THIS_MODULE, |
1da177e4 LT |
2233 | }; |
2234 | ||
4538506b JE |
2235 | static struct xt_match ip6t_builtin_mt[] __read_mostly = { |
2236 | { | |
2237 | .name = "icmp6", | |
2238 | .match = icmp6_match, | |
2239 | .matchsize = sizeof(struct ip6t_icmp), | |
2240 | .checkentry = icmp6_checkentry, | |
2241 | .proto = IPPROTO_ICMPV6, | |
2242 | .family = NFPROTO_IPV6, | |
2243 | }, | |
1da177e4 LT |
2244 | }; |
2245 | ||
3cb609d5 AD |
2246 | static int __net_init ip6_tables_net_init(struct net *net) |
2247 | { | |
383ca5b8 | 2248 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2249 | } |
2250 | ||
2251 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2252 | { | |
383ca5b8 | 2253 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2254 | } |
2255 | ||
2256 | static struct pernet_operations ip6_tables_net_ops = { | |
2257 | .init = ip6_tables_net_init, | |
2258 | .exit = ip6_tables_net_exit, | |
2259 | }; | |
2260 | ||
65b4b4e8 | 2261 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2262 | { |
2263 | int ret; | |
2264 | ||
3cb609d5 | 2265 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2266 | if (ret < 0) |
2267 | goto err1; | |
2e4e6a17 | 2268 | |
25985edc | 2269 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 2270 | ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 PM |
2271 | if (ret < 0) |
2272 | goto err2; | |
4538506b | 2273 | ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 PM |
2274 | if (ret < 0) |
2275 | goto err4; | |
1da177e4 LT |
2276 | |
2277 | /* Register setsockopt */ | |
2278 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2279 | if (ret < 0) |
2280 | goto err5; | |
1da177e4 | 2281 | |
ff67e4e4 | 2282 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2283 | return 0; |
0eff66e6 PM |
2284 | |
2285 | err5: | |
4538506b | 2286 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 | 2287 | err4: |
4538506b | 2288 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 | 2289 | err2: |
3cb609d5 | 2290 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2291 | err1: |
2292 | return ret; | |
1da177e4 LT |
2293 | } |
2294 | ||
65b4b4e8 | 2295 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2296 | { |
2297 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2298 | |
4538506b JE |
2299 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
2300 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); | |
3cb609d5 | 2301 | unregister_pernet_subsys(&ip6_tables_net_ops); |
1da177e4 LT |
2302 | } |
2303 | ||
2304 | EXPORT_SYMBOL(ip6t_register_table); | |
2305 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2306 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2307 | |
65b4b4e8 AM |
2308 | module_init(ip6_tables_init); |
2309 | module_exit(ip6_tables_fini); |