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, | |
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, | |
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 */ | |
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) { |
1da177e4 | 154 | if(ip6info->invflags & IP6T_INV_PROTO) { |
1d93a9cb | 155 | return false; |
1da177e4 | 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) */ |
47901dc2 | 201 | static inline bool unconditional(const struct ip6t_ip6 *ipv6) |
ba9dda3a | 202 | { |
47901dc2 | 203 | static const struct ip6t_ip6 uncond; |
ba9dda3a | 204 | |
47901dc2 | 205 | return memcmp(ipv6, &uncond, sizeof(uncond)) == 0; |
ba9dda3a JK |
206 | } |
207 | ||
87a2e70d | 208 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
209 | ip6t_get_target_c(const struct ip6t_entry *e) |
210 | { | |
211 | return ip6t_get_target((struct ip6t_entry *)e); | |
212 | } | |
213 | ||
07a93626 | 214 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
ba9dda3a | 215 | /* This cries for unification! */ |
022748a9 | 216 | static const char *const hooknames[] = { |
6e23ae2a PM |
217 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
218 | [NF_INET_LOCAL_IN] = "INPUT", | |
219 | [NF_INET_FORWARD] = "FORWARD", | |
220 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
221 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
222 | }; |
223 | ||
224 | enum nf_ip_trace_comments { | |
225 | NF_IP6_TRACE_COMMENT_RULE, | |
226 | NF_IP6_TRACE_COMMENT_RETURN, | |
227 | NF_IP6_TRACE_COMMENT_POLICY, | |
228 | }; | |
229 | ||
022748a9 | 230 | static const char *const comments[] = { |
ba9dda3a JK |
231 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
232 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
233 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
234 | }; | |
235 | ||
236 | static struct nf_loginfo trace_loginfo = { | |
237 | .type = NF_LOG_TYPE_LOG, | |
238 | .u = { | |
239 | .log = { | |
a81b2ce8 | 240 | .level = LOGLEVEL_WARNING, |
ba9dda3a JK |
241 | .logflags = NF_LOG_MASK, |
242 | }, | |
243 | }, | |
244 | }; | |
245 | ||
022748a9 | 246 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 247 | static inline int |
d5d1baa1 | 248 | get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e, |
4f2f6f23 JE |
249 | const char *hookname, const char **chainname, |
250 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 251 | { |
87a2e70d | 252 | const struct xt_standard_target *t = (void *)ip6t_get_target_c(s); |
ba9dda3a | 253 | |
243bf6e2 | 254 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
255 | /* Head of user chain: ERROR target with chainname */ |
256 | *chainname = t->target.data; | |
257 | (*rulenum) = 0; | |
258 | } else if (s == e) { | |
259 | (*rulenum)++; | |
260 | ||
3666ed1c JP |
261 | if (s->target_offset == sizeof(struct ip6t_entry) && |
262 | strcmp(t->target.u.kernel.target->name, | |
243bf6e2 | 263 | XT_STANDARD_TARGET) == 0 && |
3666ed1c JP |
264 | t->verdict < 0 && |
265 | unconditional(&s->ipv6)) { | |
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 | ||
d5d1baa1 | 278 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
279 | unsigned int hook, |
280 | const struct net_device *in, | |
281 | const struct net_device *out, | |
ecb6f85e | 282 | const char *tablename, |
d5d1baa1 JE |
283 | const struct xt_table_info *private, |
284 | const struct ip6t_entry *e) | |
ba9dda3a | 285 | { |
d5d1baa1 | 286 | const void *table_base; |
5452e425 | 287 | const struct ip6t_entry *root; |
4f2f6f23 | 288 | const char *hookname, *chainname, *comment; |
72b2b1dd | 289 | const struct ip6t_entry *iter; |
ba9dda3a | 290 | unsigned int rulenum = 0; |
30e0c6a6 | 291 | struct net *net = dev_net(in ? in : out); |
ba9dda3a | 292 | |
ccf5bd8c | 293 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
294 | root = get_entry(table_base, private->hook_entry[hook]); |
295 | ||
4f2f6f23 JE |
296 | hookname = chainname = hooknames[hook]; |
297 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; | |
ba9dda3a | 298 | |
72b2b1dd JE |
299 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
300 | if (get_chainname_rulenum(iter, e, hookname, | |
301 | &chainname, &comment, &rulenum) != 0) | |
302 | break; | |
ba9dda3a | 303 | |
4017a7ee PNA |
304 | nf_log_trace(net, AF_INET6, hook, skb, in, out, &trace_loginfo, |
305 | "TRACE: %s:%s:%s:%u ", | |
306 | tablename, chainname, comment, rulenum); | |
ba9dda3a JK |
307 | } |
308 | #endif | |
309 | ||
98e86403 JE |
310 | static inline __pure struct ip6t_entry * |
311 | ip6t_next_entry(const struct ip6t_entry *entry) | |
312 | { | |
313 | return (void *)entry + entry->next_offset; | |
314 | } | |
315 | ||
1da177e4 LT |
316 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
317 | unsigned int | |
3db05fea | 318 | ip6t_do_table(struct sk_buff *skb, |
1da177e4 | 319 | unsigned int hook, |
8f8a3715 | 320 | const struct nf_hook_state *state, |
fe1cb108 | 321 | struct xt_table *table) |
1da177e4 | 322 | { |
6b7d31fc | 323 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
324 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
325 | unsigned int verdict = NF_DROP; | |
326 | const char *indev, *outdev; | |
d5d1baa1 | 327 | const void *table_base; |
f3c5c1bf JE |
328 | struct ip6t_entry *e, **jumpstack; |
329 | unsigned int *stackptr, origptr, cpu; | |
d5d1baa1 | 330 | const struct xt_table_info *private; |
de74c169 | 331 | struct xt_action_param acpar; |
7f5c6d4f | 332 | unsigned int addend; |
1da177e4 LT |
333 | |
334 | /* Initialization */ | |
8f8a3715 DM |
335 | indev = state->in ? state->in->name : nulldevname; |
336 | outdev = state->out ? state->out->name : nulldevname; | |
1da177e4 LT |
337 | /* We handle fragments by dealing with the first fragment as |
338 | * if it was a normal packet. All other fragments are treated | |
339 | * normally, except that they will NEVER match rules that ask | |
340 | * things we don't know, ie. tcp syn flag or ports). If the | |
341 | * rule is also a fragment-specific rule, non-fragments won't | |
342 | * match it. */ | |
b4ba2611 | 343 | acpar.hotdrop = false; |
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 JE |
359 | cpu = smp_processor_id(); |
360 | table_base = private->entries[cpu]; | |
361 | jumpstack = (struct ip6t_entry **)private->jumpstack[cpu]; | |
7489aec8 | 362 | stackptr = per_cpu_ptr(private->stackptr, cpu); |
f3c5c1bf | 363 | origptr = *stackptr; |
78454473 | 364 | |
2e4e6a17 | 365 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 366 | |
1da177e4 | 367 | do { |
87a2e70d | 368 | const struct xt_entry_target *t; |
dcea992a | 369 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 370 | |
1da177e4 | 371 | IP_NF_ASSERT(e); |
84018f55 | 372 | acpar.thoff = 0; |
a1ff4ac8 | 373 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
b4ba2611 | 374 | &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) { |
dcea992a | 375 | no_match: |
a1ff4ac8 JE |
376 | e = ip6t_next_entry(e); |
377 | continue; | |
378 | } | |
1da177e4 | 379 | |
ef53d702 | 380 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
381 | acpar.match = ematch->u.kernel.match; |
382 | acpar.matchinfo = ematch->data; | |
383 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 384 | goto no_match; |
ef53d702 | 385 | } |
dcea992a | 386 | |
261abc8c | 387 | ADD_COUNTER(e->counters, skb->len, 1); |
1da177e4 | 388 | |
d5d1baa1 | 389 | t = ip6t_get_target_c(e); |
a1ff4ac8 | 390 | IP_NF_ASSERT(t->u.kernel.target); |
ba9dda3a | 391 | |
07a93626 | 392 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
393 | /* The packet is traced: log it */ |
394 | if (unlikely(skb->nf_trace)) | |
8f8a3715 | 395 | trace_packet(skb, hook, state->in, state->out, |
a1ff4ac8 | 396 | table->name, private, e); |
ba9dda3a | 397 | #endif |
a1ff4ac8 JE |
398 | /* Standard target? */ |
399 | if (!t->u.kernel.target->target) { | |
400 | int v; | |
401 | ||
87a2e70d | 402 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
403 | if (v < 0) { |
404 | /* Pop from stack? */ | |
243bf6e2 | 405 | if (v != XT_RETURN) { |
95c96174 | 406 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 407 | break; |
1da177e4 | 408 | } |
db856674 | 409 | if (*stackptr <= origptr) |
f3c5c1bf JE |
410 | e = get_entry(table_base, |
411 | private->underflow[hook]); | |
412 | else | |
413 | e = ip6t_next_entry(jumpstack[--*stackptr]); | |
a1ff4ac8 JE |
414 | continue; |
415 | } | |
3666ed1c JP |
416 | if (table_base + v != ip6t_next_entry(e) && |
417 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
f3c5c1bf JE |
418 | if (*stackptr >= private->stacksize) { |
419 | verdict = NF_DROP; | |
420 | break; | |
421 | } | |
422 | jumpstack[(*stackptr)++] = e; | |
a1ff4ac8 | 423 | } |
1da177e4 | 424 | |
a1ff4ac8 | 425 | e = get_entry(table_base, v); |
7a6b1c46 JE |
426 | continue; |
427 | } | |
428 | ||
de74c169 JE |
429 | acpar.target = t->u.kernel.target; |
430 | acpar.targinfo = t->data; | |
7eb35586 | 431 | |
de74c169 | 432 | verdict = t->u.kernel.target->target(skb, &acpar); |
243bf6e2 | 433 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
434 | e = ip6t_next_entry(e); |
435 | else | |
436 | /* Verdict */ | |
437 | break; | |
b4ba2611 | 438 | } while (!acpar.hotdrop); |
1da177e4 | 439 | |
f3c5c1bf | 440 | *stackptr = origptr; |
7f5c6d4f ED |
441 | |
442 | xt_write_recseq_end(addend); | |
443 | local_bh_enable(); | |
1da177e4 LT |
444 | |
445 | #ifdef DEBUG_ALLOW_ALL | |
446 | return NF_ACCEPT; | |
447 | #else | |
b4ba2611 | 448 | if (acpar.hotdrop) |
1da177e4 LT |
449 | return NF_DROP; |
450 | else return verdict; | |
451 | #endif | |
452 | } | |
453 | ||
1da177e4 LT |
454 | /* Figures out from what hook each rule can be called: returns 0 if |
455 | there are loops. Puts hook bitmask in comefrom. */ | |
456 | static int | |
d5d1baa1 | 457 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 458 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
459 | { |
460 | unsigned int hook; | |
461 | ||
462 | /* No recursion; use packet counter to save back ptrs (reset | |
463 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 464 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 465 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 466 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
467 | |
468 | if (!(valid_hooks & (1 << hook))) | |
469 | continue; | |
470 | ||
471 | /* Set initial back pointer. */ | |
472 | e->counters.pcnt = pos; | |
473 | ||
474 | for (;;) { | |
87a2e70d | 475 | const struct xt_standard_target *t |
d5d1baa1 | 476 | = (void *)ip6t_get_target_c(e); |
9c547959 | 477 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 478 | |
6e23ae2a | 479 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
654d0fbd | 480 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
481 | hook, pos, e->comefrom); |
482 | return 0; | |
483 | } | |
9c547959 | 484 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
485 | |
486 | /* Unconditional return/END. */ | |
3666ed1c JP |
487 | if ((e->target_offset == sizeof(struct ip6t_entry) && |
488 | (strcmp(t->target.u.user.name, | |
243bf6e2 | 489 | XT_STANDARD_TARGET) == 0) && |
3666ed1c JP |
490 | t->verdict < 0 && |
491 | unconditional(&e->ipv6)) || visited) { | |
1da177e4 LT |
492 | unsigned int oldpos, size; |
493 | ||
1f9352ae | 494 | if ((strcmp(t->target.u.user.name, |
243bf6e2 | 495 | XT_STANDARD_TARGET) == 0) && |
1f9352ae | 496 | t->verdict < -NF_MAX_VERDICT - 1) { |
74c9c0c1 DM |
497 | duprintf("mark_source_chains: bad " |
498 | "negative verdict (%i)\n", | |
499 | t->verdict); | |
500 | return 0; | |
501 | } | |
502 | ||
1da177e4 LT |
503 | /* Return: backtrack through the last |
504 | big jump. */ | |
505 | do { | |
6e23ae2a | 506 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
507 | #ifdef DEBUG_IP_FIREWALL_USER |
508 | if (e->comefrom | |
6e23ae2a | 509 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
510 | duprintf("Back unset " |
511 | "on hook %u " | |
512 | "rule %u\n", | |
513 | hook, pos); | |
514 | } | |
515 | #endif | |
516 | oldpos = pos; | |
517 | pos = e->counters.pcnt; | |
518 | e->counters.pcnt = 0; | |
519 | ||
520 | /* We're at the start. */ | |
521 | if (pos == oldpos) | |
522 | goto next; | |
523 | ||
524 | e = (struct ip6t_entry *) | |
31836064 | 525 | (entry0 + pos); |
1da177e4 LT |
526 | } while (oldpos == pos + e->next_offset); |
527 | ||
528 | /* Move along one */ | |
529 | size = e->next_offset; | |
530 | e = (struct ip6t_entry *) | |
31836064 | 531 | (entry0 + pos + size); |
1da177e4 LT |
532 | e->counters.pcnt = pos; |
533 | pos += size; | |
534 | } else { | |
535 | int newpos = t->verdict; | |
536 | ||
537 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 538 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 539 | newpos >= 0) { |
74c9c0c1 DM |
540 | if (newpos > newinfo->size - |
541 | sizeof(struct ip6t_entry)) { | |
542 | duprintf("mark_source_chains: " | |
543 | "bad verdict (%i)\n", | |
544 | newpos); | |
545 | return 0; | |
546 | } | |
1da177e4 LT |
547 | /* This a jump; chase it. */ |
548 | duprintf("Jump rule %u -> %u\n", | |
549 | pos, newpos); | |
550 | } else { | |
551 | /* ... this is a fallthru */ | |
552 | newpos = pos + e->next_offset; | |
553 | } | |
554 | e = (struct ip6t_entry *) | |
31836064 | 555 | (entry0 + newpos); |
1da177e4 LT |
556 | e->counters.pcnt = pos; |
557 | pos = newpos; | |
558 | } | |
559 | } | |
560 | next: | |
561 | duprintf("Finished chain %u\n", hook); | |
562 | } | |
563 | return 1; | |
564 | } | |
565 | ||
87a2e70d | 566 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 567 | { |
6be3d859 JE |
568 | struct xt_mtdtor_param par; |
569 | ||
f54e9367 | 570 | par.net = net; |
6be3d859 JE |
571 | par.match = m->u.kernel.match; |
572 | par.matchinfo = m->data; | |
916a917d | 573 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
574 | if (par.match->destroy != NULL) |
575 | par.match->destroy(&par); | |
576 | module_put(par.match->me); | |
1da177e4 LT |
577 | } |
578 | ||
022748a9 | 579 | static int |
d5d1baa1 | 580 | check_entry(const struct ip6t_entry *e, const char *name) |
f173c8a1 | 581 | { |
87a2e70d | 582 | const struct xt_entry_target *t; |
f173c8a1 PM |
583 | |
584 | if (!ip6_checkentry(&e->ipv6)) { | |
585 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
586 | return -EINVAL; | |
587 | } | |
588 | ||
87a2e70d | 589 | if (e->target_offset + sizeof(struct xt_entry_target) > |
f173c8a1 PM |
590 | e->next_offset) |
591 | return -EINVAL; | |
592 | ||
d5d1baa1 | 593 | t = ip6t_get_target_c(e); |
f173c8a1 PM |
594 | if (e->target_offset + t->u.target_size > e->next_offset) |
595 | return -EINVAL; | |
596 | ||
597 | return 0; | |
598 | } | |
599 | ||
87a2e70d | 600 | static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
f173c8a1 | 601 | { |
9b4fce7a | 602 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
603 | int ret; |
604 | ||
9b4fce7a JE |
605 | par->match = m->u.kernel.match; |
606 | par->matchinfo = m->data; | |
607 | ||
916a917d | 608 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 609 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
367c6790 | 610 | if (ret < 0) { |
f173c8a1 | 611 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 612 | par.match->name); |
367c6790 | 613 | return ret; |
f173c8a1 | 614 | } |
367c6790 | 615 | return 0; |
f173c8a1 PM |
616 | } |
617 | ||
022748a9 | 618 | static int |
87a2e70d | 619 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 620 | { |
6709dbbb | 621 | struct xt_match *match; |
3cdc7c95 | 622 | int ret; |
1da177e4 | 623 | |
fd0ec0e6 JE |
624 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
625 | m->u.user.revision); | |
626 | if (IS_ERR(match)) { | |
f173c8a1 | 627 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 628 | return PTR_ERR(match); |
1da177e4 LT |
629 | } |
630 | m->u.kernel.match = match; | |
1da177e4 | 631 | |
6bdb331b | 632 | ret = check_match(m, par); |
3cdc7c95 PM |
633 | if (ret) |
634 | goto err; | |
635 | ||
1da177e4 | 636 | return 0; |
3cdc7c95 PM |
637 | err: |
638 | module_put(m->u.kernel.match->me); | |
639 | return ret; | |
1da177e4 LT |
640 | } |
641 | ||
add67461 | 642 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 643 | { |
87a2e70d | 644 | struct xt_entry_target *t = ip6t_get_target(e); |
af5d6dc2 | 645 | struct xt_tgchk_param par = { |
add67461 | 646 | .net = net, |
af5d6dc2 JE |
647 | .table = name, |
648 | .entryinfo = e, | |
649 | .target = t->u.kernel.target, | |
650 | .targinfo = t->data, | |
651 | .hook_mask = e->comefrom, | |
916a917d | 652 | .family = NFPROTO_IPV6, |
af5d6dc2 | 653 | }; |
1da177e4 | 654 | int ret; |
1da177e4 | 655 | |
f173c8a1 | 656 | t = ip6t_get_target(e); |
916a917d | 657 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 658 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
367c6790 | 659 | if (ret < 0) { |
f173c8a1 PM |
660 | duprintf("ip_tables: check failed for `%s'.\n", |
661 | t->u.kernel.target->name); | |
367c6790 | 662 | return ret; |
1da177e4 | 663 | } |
367c6790 | 664 | return 0; |
f173c8a1 | 665 | } |
1da177e4 | 666 | |
022748a9 | 667 | static int |
a83d8e8d | 668 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
0559518b | 669 | unsigned int size) |
f173c8a1 | 670 | { |
87a2e70d | 671 | struct xt_entry_target *t; |
f173c8a1 PM |
672 | struct xt_target *target; |
673 | int ret; | |
674 | unsigned int j; | |
9b4fce7a | 675 | struct xt_mtchk_param mtpar; |
dcea992a | 676 | struct xt_entry_match *ematch; |
f173c8a1 PM |
677 | |
678 | ret = check_entry(e, name); | |
679 | if (ret) | |
680 | return ret; | |
590bdf7f | 681 | |
1da177e4 | 682 | j = 0; |
a83d8e8d | 683 | mtpar.net = net; |
9b4fce7a JE |
684 | mtpar.table = name; |
685 | mtpar.entryinfo = &e->ipv6; | |
686 | mtpar.hook_mask = e->comefrom; | |
916a917d | 687 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 688 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 689 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 690 | if (ret != 0) |
6bdb331b JE |
691 | goto cleanup_matches; |
692 | ++j; | |
dcea992a | 693 | } |
1da177e4 LT |
694 | |
695 | t = ip6t_get_target(e); | |
d2a7b6ba JE |
696 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
697 | t->u.user.revision); | |
698 | if (IS_ERR(target)) { | |
f173c8a1 | 699 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 700 | ret = PTR_ERR(target); |
1da177e4 LT |
701 | goto cleanup_matches; |
702 | } | |
703 | t->u.kernel.target = target; | |
6b7d31fc | 704 | |
add67461 | 705 | ret = check_target(e, net, name); |
3cdc7c95 PM |
706 | if (ret) |
707 | goto err; | |
1da177e4 | 708 | return 0; |
3cdc7c95 PM |
709 | err: |
710 | module_put(t->u.kernel.target->me); | |
1da177e4 | 711 | cleanup_matches: |
6bdb331b JE |
712 | xt_ematch_foreach(ematch, e) { |
713 | if (j-- == 0) | |
dcea992a | 714 | break; |
6bdb331b JE |
715 | cleanup_match(ematch, net); |
716 | } | |
1da177e4 LT |
717 | return ret; |
718 | } | |
719 | ||
d5d1baa1 | 720 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 | 721 | { |
87a2e70d | 722 | const struct xt_entry_target *t; |
e2fe35c1 JE |
723 | unsigned int verdict; |
724 | ||
725 | if (!unconditional(&e->ipv6)) | |
726 | return false; | |
d5d1baa1 | 727 | t = ip6t_get_target_c(e); |
e2fe35c1 JE |
728 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
729 | return false; | |
87a2e70d | 730 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
731 | verdict = -verdict - 1; |
732 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
733 | } | |
734 | ||
022748a9 | 735 | static int |
1da177e4 | 736 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 737 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
738 | const unsigned char *base, |
739 | const unsigned char *limit, | |
1da177e4 LT |
740 | const unsigned int *hook_entries, |
741 | const unsigned int *underflows, | |
0559518b | 742 | unsigned int valid_hooks) |
1da177e4 LT |
743 | { |
744 | unsigned int h; | |
745 | ||
3666ed1c JP |
746 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
747 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
1da177e4 LT |
748 | duprintf("Bad offset %p\n", e); |
749 | return -EINVAL; | |
750 | } | |
751 | ||
752 | if (e->next_offset | |
87a2e70d | 753 | < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) { |
1da177e4 LT |
754 | duprintf("checking: element %p size %u\n", |
755 | e, e->next_offset); | |
756 | return -EINVAL; | |
757 | } | |
758 | ||
759 | /* Check hooks & underflows */ | |
6e23ae2a | 760 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
761 | if (!(valid_hooks & (1 << h))) |
762 | continue; | |
1da177e4 LT |
763 | if ((unsigned char *)e - base == hook_entries[h]) |
764 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 765 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
766 | if (!check_underflow(e)) { |
767 | pr_err("Underflows must be unconditional and " | |
768 | "use the STANDARD target with " | |
769 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
770 | return -EINVAL; |
771 | } | |
1da177e4 | 772 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 773 | } |
1da177e4 LT |
774 | } |
775 | ||
1da177e4 | 776 | /* Clear counters and comefrom */ |
2e4e6a17 | 777 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 778 | e->comefrom = 0; |
1da177e4 LT |
779 | return 0; |
780 | } | |
781 | ||
0559518b | 782 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
1da177e4 | 783 | { |
a2df1648 | 784 | struct xt_tgdtor_param par; |
87a2e70d | 785 | struct xt_entry_target *t; |
dcea992a | 786 | struct xt_entry_match *ematch; |
1da177e4 | 787 | |
1da177e4 | 788 | /* Cleanup all matches */ |
dcea992a | 789 | xt_ematch_foreach(ematch, e) |
6bdb331b | 790 | cleanup_match(ematch, net); |
1da177e4 | 791 | t = ip6t_get_target(e); |
a2df1648 | 792 | |
add67461 | 793 | par.net = net; |
a2df1648 JE |
794 | par.target = t->u.kernel.target; |
795 | par.targinfo = t->data; | |
916a917d | 796 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
797 | if (par.target->destroy != NULL) |
798 | par.target->destroy(&par); | |
799 | module_put(par.target->me); | |
1da177e4 LT |
800 | } |
801 | ||
802 | /* Checks and translates the user-supplied table segment (held in | |
803 | newinfo) */ | |
804 | static int | |
0f234214 JE |
805 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
806 | const struct ip6t_replace *repl) | |
1da177e4 | 807 | { |
72b2b1dd | 808 | struct ip6t_entry *iter; |
1da177e4 | 809 | unsigned int i; |
72b2b1dd | 810 | int ret = 0; |
1da177e4 | 811 | |
0f234214 JE |
812 | newinfo->size = repl->size; |
813 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
814 | |
815 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 816 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
817 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
818 | newinfo->underflow[i] = 0xFFFFFFFF; | |
819 | } | |
820 | ||
821 | duprintf("translate_table: size %u\n", newinfo->size); | |
822 | i = 0; | |
823 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
824 | xt_entry_foreach(iter, entry0, newinfo->size) { |
825 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
826 | entry0 + repl->size, |
827 | repl->hook_entry, | |
828 | repl->underflow, | |
829 | repl->valid_hooks); | |
72b2b1dd | 830 | if (ret != 0) |
0559518b JE |
831 | return ret; |
832 | ++i; | |
f3c5c1bf JE |
833 | if (strcmp(ip6t_get_target(iter)->u.user.name, |
834 | XT_ERROR_TARGET) == 0) | |
835 | ++newinfo->stacksize; | |
72b2b1dd | 836 | } |
1da177e4 | 837 | |
0f234214 | 838 | if (i != repl->num_entries) { |
1da177e4 | 839 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 840 | i, repl->num_entries); |
1da177e4 LT |
841 | return -EINVAL; |
842 | } | |
843 | ||
844 | /* Check hooks all assigned */ | |
6e23ae2a | 845 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 846 | /* Only hooks which are valid */ |
0f234214 | 847 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
848 | continue; |
849 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
850 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 851 | i, repl->hook_entry[i]); |
1da177e4 LT |
852 | return -EINVAL; |
853 | } | |
854 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
855 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 856 | i, repl->underflow[i]); |
1da177e4 LT |
857 | return -EINVAL; |
858 | } | |
859 | } | |
860 | ||
0f234214 | 861 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
862 | return -ELOOP; |
863 | ||
1da177e4 LT |
864 | /* Finally, each sanity check must pass */ |
865 | i = 0; | |
72b2b1dd | 866 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 867 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
868 | if (ret != 0) |
869 | break; | |
0559518b | 870 | ++i; |
72b2b1dd | 871 | } |
1da177e4 | 872 | |
74c9c0c1 | 873 | if (ret != 0) { |
0559518b JE |
874 | xt_entry_foreach(iter, entry0, newinfo->size) { |
875 | if (i-- == 0) | |
72b2b1dd | 876 | break; |
0559518b JE |
877 | cleanup_entry(iter, net); |
878 | } | |
74c9c0c1 DM |
879 | return ret; |
880 | } | |
1da177e4 LT |
881 | |
882 | /* And one copy for every other CPU */ | |
6f912042 | 883 | for_each_possible_cpu(i) { |
31836064 ED |
884 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
885 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
886 | } |
887 | ||
9c547959 | 888 | return ret; |
1da177e4 LT |
889 | } |
890 | ||
1da177e4 | 891 | static void |
2e4e6a17 HW |
892 | get_counters(const struct xt_table_info *t, |
893 | struct xt_counters counters[]) | |
1da177e4 | 894 | { |
72b2b1dd | 895 | struct ip6t_entry *iter; |
1da177e4 LT |
896 | unsigned int cpu; |
897 | unsigned int i; | |
898 | ||
6f912042 | 899 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 900 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 901 | |
1da177e4 | 902 | i = 0; |
0559518b | 903 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
83723d60 ED |
904 | u64 bcnt, pcnt; |
905 | unsigned int start; | |
906 | ||
907 | do { | |
7f5c6d4f | 908 | start = read_seqcount_begin(s); |
83723d60 ED |
909 | bcnt = iter->counters.bcnt; |
910 | pcnt = iter->counters.pcnt; | |
7f5c6d4f | 911 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
912 | |
913 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
914 | ++i; |
915 | } | |
1da177e4 | 916 | } |
78454473 SH |
917 | } |
918 | ||
d5d1baa1 | 919 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 920 | { |
ed1a6f5e | 921 | unsigned int countersize; |
2e4e6a17 | 922 | struct xt_counters *counters; |
d5d1baa1 | 923 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
924 | |
925 | /* We need atomic snapshot of counters: rest doesn't change | |
926 | (other than comefrom, which userspace doesn't care | |
927 | about). */ | |
2e4e6a17 | 928 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 929 | counters = vzalloc(countersize); |
1da177e4 LT |
930 | |
931 | if (counters == NULL) | |
942e4a2b | 932 | return ERR_PTR(-ENOMEM); |
78454473 | 933 | |
942e4a2b | 934 | get_counters(private, counters); |
78454473 | 935 | |
49a88d18 | 936 | return counters; |
ed1a6f5e PM |
937 | } |
938 | ||
939 | static int | |
940 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 941 | const struct xt_table *table, |
ed1a6f5e PM |
942 | void __user *userptr) |
943 | { | |
944 | unsigned int off, num; | |
d5d1baa1 | 945 | const struct ip6t_entry *e; |
ed1a6f5e | 946 | struct xt_counters *counters; |
5452e425 | 947 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 948 | int ret = 0; |
5452e425 | 949 | const void *loc_cpu_entry; |
ed1a6f5e PM |
950 | |
951 | counters = alloc_counters(table); | |
952 | if (IS_ERR(counters)) | |
953 | return PTR_ERR(counters); | |
954 | ||
9c547959 PM |
955 | /* choose the copy that is on our node/cpu, ... |
956 | * This choice is lazy (because current thread is | |
957 | * allowed to migrate to another cpu) | |
958 | */ | |
2e4e6a17 | 959 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 960 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
961 | ret = -EFAULT; |
962 | goto free_counters; | |
963 | } | |
964 | ||
965 | /* FIXME: use iterator macros --RR */ | |
966 | /* ... then go back and fix counters and names */ | |
967 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
968 | unsigned int i; | |
87a2e70d JE |
969 | const struct xt_entry_match *m; |
970 | const struct xt_entry_target *t; | |
1da177e4 | 971 | |
31836064 | 972 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
973 | if (copy_to_user(userptr + off |
974 | + offsetof(struct ip6t_entry, counters), | |
975 | &counters[num], | |
976 | sizeof(counters[num])) != 0) { | |
977 | ret = -EFAULT; | |
978 | goto free_counters; | |
979 | } | |
980 | ||
981 | for (i = sizeof(struct ip6t_entry); | |
982 | i < e->target_offset; | |
983 | i += m->u.match_size) { | |
984 | m = (void *)e + i; | |
985 | ||
986 | if (copy_to_user(userptr + off + i | |
87a2e70d | 987 | + offsetof(struct xt_entry_match, |
1da177e4 LT |
988 | u.user.name), |
989 | m->u.kernel.match->name, | |
990 | strlen(m->u.kernel.match->name)+1) | |
991 | != 0) { | |
992 | ret = -EFAULT; | |
993 | goto free_counters; | |
994 | } | |
995 | } | |
996 | ||
d5d1baa1 | 997 | t = ip6t_get_target_c(e); |
1da177e4 | 998 | if (copy_to_user(userptr + off + e->target_offset |
87a2e70d | 999 | + offsetof(struct xt_entry_target, |
1da177e4 LT |
1000 | u.user.name), |
1001 | t->u.kernel.target->name, | |
1002 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1003 | ret = -EFAULT; | |
1004 | goto free_counters; | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | free_counters: | |
1009 | vfree(counters); | |
1010 | return ret; | |
1011 | } | |
1012 | ||
3bc3fe5e | 1013 | #ifdef CONFIG_COMPAT |
739674fb | 1014 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
1015 | { |
1016 | int v = *(compat_int_t *)src; | |
1017 | ||
1018 | if (v > 0) | |
1019 | v += xt_compat_calc_jump(AF_INET6, v); | |
1020 | memcpy(dst, &v, sizeof(v)); | |
1021 | } | |
1022 | ||
739674fb | 1023 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
1024 | { |
1025 | compat_int_t cv = *(int *)src; | |
1026 | ||
1027 | if (cv > 0) | |
1028 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1029 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1030 | } | |
1031 | ||
d5d1baa1 | 1032 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 1033 | const struct xt_table_info *info, |
d5d1baa1 | 1034 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 1035 | { |
dcea992a | 1036 | const struct xt_entry_match *ematch; |
87a2e70d | 1037 | const struct xt_entry_target *t; |
3bc3fe5e PM |
1038 | unsigned int entry_offset; |
1039 | int off, i, ret; | |
1040 | ||
1041 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1042 | entry_offset = (void *)e - base; | |
dcea992a | 1043 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1044 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1045 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
1046 | off += xt_compat_target_offset(t->u.kernel.target); |
1047 | newinfo->size -= off; | |
1048 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1049 | if (ret) | |
1050 | return ret; | |
1051 | ||
1052 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1053 | if (info->hook_entry[i] && | |
1054 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1055 | newinfo->hook_entry[i] -= off; | |
1056 | if (info->underflow[i] && | |
1057 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1058 | newinfo->underflow[i] -= off; | |
1059 | } | |
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | static int compat_table_info(const struct xt_table_info *info, | |
1064 | struct xt_table_info *newinfo) | |
1065 | { | |
72b2b1dd | 1066 | struct ip6t_entry *iter; |
3bc3fe5e | 1067 | void *loc_cpu_entry; |
0559518b | 1068 | int ret; |
3bc3fe5e PM |
1069 | |
1070 | if (!newinfo || !info) | |
1071 | return -EINVAL; | |
1072 | ||
1073 | /* we dont care about newinfo->entries[] */ | |
1074 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1075 | newinfo->initial_entries = 0; | |
1076 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
255d0dc3 | 1077 | xt_compat_init_offsets(AF_INET6, info->number); |
72b2b1dd JE |
1078 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1079 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1080 | if (ret != 0) | |
0559518b | 1081 | return ret; |
72b2b1dd | 1082 | } |
0559518b | 1083 | return 0; |
3bc3fe5e PM |
1084 | } |
1085 | #endif | |
1086 | ||
d5d1baa1 JE |
1087 | static int get_info(struct net *net, void __user *user, |
1088 | const int *len, int compat) | |
433665c9 | 1089 | { |
12b00c2c | 1090 | char name[XT_TABLE_MAXNAMELEN]; |
433665c9 PM |
1091 | struct xt_table *t; |
1092 | int ret; | |
1093 | ||
1094 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1095 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1096 | sizeof(struct ip6t_getinfo)); |
1097 | return -EINVAL; | |
1098 | } | |
1099 | ||
1100 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1101 | return -EFAULT; | |
1102 | ||
12b00c2c | 1103 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
3bc3fe5e PM |
1104 | #ifdef CONFIG_COMPAT |
1105 | if (compat) | |
1106 | xt_compat_lock(AF_INET6); | |
1107 | #endif | |
336b517f | 1108 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 | 1109 | "ip6table_%s", name); |
0cc8d8df | 1110 | if (!IS_ERR_OR_NULL(t)) { |
433665c9 | 1111 | struct ip6t_getinfo info; |
5452e425 | 1112 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1113 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1114 | struct xt_table_info tmp; |
1115 | ||
3bc3fe5e | 1116 | if (compat) { |
3bc3fe5e PM |
1117 | ret = compat_table_info(private, &tmp); |
1118 | xt_compat_flush_offsets(AF_INET6); | |
1119 | private = &tmp; | |
1120 | } | |
1121 | #endif | |
cccbe5ef | 1122 | memset(&info, 0, sizeof(info)); |
433665c9 PM |
1123 | info.valid_hooks = t->valid_hooks; |
1124 | memcpy(info.hook_entry, private->hook_entry, | |
1125 | sizeof(info.hook_entry)); | |
1126 | memcpy(info.underflow, private->underflow, | |
1127 | sizeof(info.underflow)); | |
1128 | info.num_entries = private->number; | |
1129 | info.size = private->size; | |
b5dd674b | 1130 | strcpy(info.name, name); |
433665c9 PM |
1131 | |
1132 | if (copy_to_user(user, &info, *len) != 0) | |
1133 | ret = -EFAULT; | |
1134 | else | |
1135 | ret = 0; | |
1136 | ||
1137 | xt_table_unlock(t); | |
1138 | module_put(t->me); | |
1139 | } else | |
1140 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1141 | #ifdef CONFIG_COMPAT |
1142 | if (compat) | |
1143 | xt_compat_unlock(AF_INET6); | |
1144 | #endif | |
433665c9 PM |
1145 | return ret; |
1146 | } | |
1147 | ||
1da177e4 | 1148 | static int |
d5d1baa1 JE |
1149 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
1150 | const int *len) | |
1da177e4 LT |
1151 | { |
1152 | int ret; | |
d924357c | 1153 | struct ip6t_get_entries get; |
2e4e6a17 | 1154 | struct xt_table *t; |
1da177e4 | 1155 | |
d924357c | 1156 | if (*len < sizeof(get)) { |
c9d8fe13 | 1157 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1158 | return -EINVAL; |
1159 | } | |
1160 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1161 | return -EFAULT; | |
1162 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1163 | duprintf("get_entries: %u != %zu\n", |
1164 | *len, sizeof(get) + get.size); | |
d924357c PM |
1165 | return -EINVAL; |
1166 | } | |
1167 | ||
336b517f | 1168 | t = xt_find_table_lock(net, AF_INET6, get.name); |
0cc8d8df | 1169 | if (!IS_ERR_OR_NULL(t)) { |
2e4e6a17 HW |
1170 | struct xt_table_info *private = t->private; |
1171 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1172 | if (get.size == private->size) |
2e4e6a17 | 1173 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1174 | t, uptr->entrytable); |
1175 | else { | |
1176 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1177 | private->size, get.size); |
544473c1 | 1178 | ret = -EAGAIN; |
1da177e4 | 1179 | } |
6b7d31fc | 1180 | module_put(t->me); |
2e4e6a17 | 1181 | xt_table_unlock(t); |
1da177e4 | 1182 | } else |
6b7d31fc | 1183 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1184 | |
1185 | return ret; | |
1186 | } | |
1187 | ||
1188 | static int | |
336b517f | 1189 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1190 | struct xt_table_info *newinfo, unsigned int num_counters, |
1191 | void __user *counters_ptr) | |
1da177e4 LT |
1192 | { |
1193 | int ret; | |
2e4e6a17 | 1194 | struct xt_table *t; |
3bc3fe5e | 1195 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1196 | struct xt_counters *counters; |
5452e425 | 1197 | const void *loc_cpu_old_entry; |
72b2b1dd | 1198 | struct ip6t_entry *iter; |
1da177e4 | 1199 | |
3bc3fe5e | 1200 | ret = 0; |
83723d60 | 1201 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
1da177e4 LT |
1202 | if (!counters) { |
1203 | ret = -ENOMEM; | |
3bc3fe5e | 1204 | goto out; |
1da177e4 | 1205 | } |
1da177e4 | 1206 | |
336b517f | 1207 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1208 | "ip6table_%s", name); |
0cc8d8df | 1209 | if (IS_ERR_OR_NULL(t)) { |
6b7d31fc | 1210 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1211 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1212 | } |
1da177e4 LT |
1213 | |
1214 | /* You lied! */ | |
3bc3fe5e | 1215 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1216 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1217 | valid_hooks, t->valid_hooks); |
1da177e4 | 1218 | ret = -EINVAL; |
6b7d31fc | 1219 | goto put_module; |
1da177e4 LT |
1220 | } |
1221 | ||
3bc3fe5e | 1222 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1223 | if (!oldinfo) |
1224 | goto put_module; | |
1225 | ||
1226 | /* Update module usage count based on number of rules */ | |
1227 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1228 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1229 | if ((oldinfo->number > oldinfo->initial_entries) || |
1230 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1231 | module_put(t->me); |
1232 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1233 | (newinfo->number <= oldinfo->initial_entries)) | |
1234 | module_put(t->me); | |
1235 | ||
942e4a2b | 1236 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1237 | get_counters(oldinfo, counters); |
942e4a2b | 1238 | |
1da177e4 | 1239 | /* Decrease module usage counts and free resource */ |
31836064 | 1240 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
72b2b1dd | 1241 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1242 | cleanup_entry(iter, net); |
72b2b1dd | 1243 | |
2e4e6a17 | 1244 | xt_free_table_info(oldinfo); |
3bc3fe5e | 1245 | if (copy_to_user(counters_ptr, counters, |
c58dd2dd TG |
1246 | sizeof(struct xt_counters) * num_counters) != 0) { |
1247 | /* Silent error, can't fail, new table is already in place */ | |
1248 | net_warn_ratelimited("ip6tables: counters copy to user failed while replacing table\n"); | |
1249 | } | |
1da177e4 | 1250 | vfree(counters); |
2e4e6a17 | 1251 | xt_table_unlock(t); |
1da177e4 LT |
1252 | return ret; |
1253 | ||
1254 | put_module: | |
1255 | module_put(t->me); | |
2e4e6a17 | 1256 | xt_table_unlock(t); |
1da177e4 | 1257 | free_newinfo_counters_untrans: |
1da177e4 | 1258 | vfree(counters); |
3bc3fe5e PM |
1259 | out: |
1260 | return ret; | |
1261 | } | |
1262 | ||
1263 | static int | |
d5d1baa1 | 1264 | do_replace(struct net *net, const void __user *user, unsigned int len) |
3bc3fe5e PM |
1265 | { |
1266 | int ret; | |
1267 | struct ip6t_replace tmp; | |
1268 | struct xt_table_info *newinfo; | |
1269 | void *loc_cpu_entry; | |
72b2b1dd | 1270 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1271 | |
1272 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1273 | return -EFAULT; | |
1274 | ||
1275 | /* overflow check */ | |
1276 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1277 | return -ENOMEM; | |
1086bbe9 DJ |
1278 | if (tmp.num_counters == 0) |
1279 | return -EINVAL; | |
1280 | ||
6a8ab060 | 1281 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1282 | |
1283 | newinfo = xt_alloc_table_info(tmp.size); | |
1284 | if (!newinfo) | |
1285 | return -ENOMEM; | |
1286 | ||
1287 | /* choose the copy that is on our node/cpu */ | |
1288 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1289 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1290 | tmp.size) != 0) { | |
1291 | ret = -EFAULT; | |
1292 | goto free_newinfo; | |
1293 | } | |
1294 | ||
0f234214 | 1295 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1296 | if (ret != 0) |
1297 | goto free_newinfo; | |
1298 | ||
1299 | duprintf("ip_tables: Translated table\n"); | |
1300 | ||
336b517f | 1301 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1302 | tmp.num_counters, tmp.counters); |
1303 | if (ret) | |
1304 | goto free_newinfo_untrans; | |
1305 | return 0; | |
1306 | ||
1307 | free_newinfo_untrans: | |
72b2b1dd | 1308 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1309 | cleanup_entry(iter, net); |
1da177e4 | 1310 | free_newinfo: |
2e4e6a17 | 1311 | xt_free_table_info(newinfo); |
1da177e4 LT |
1312 | return ret; |
1313 | } | |
1314 | ||
1da177e4 | 1315 | static int |
d5d1baa1 | 1316 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
336b517f | 1317 | int compat) |
1da177e4 | 1318 | { |
942e4a2b | 1319 | unsigned int i, curcpu; |
3bc3fe5e PM |
1320 | struct xt_counters_info tmp; |
1321 | struct xt_counters *paddc; | |
1322 | unsigned int num_counters; | |
1323 | char *name; | |
1324 | int size; | |
1325 | void *ptmp; | |
2e4e6a17 | 1326 | struct xt_table *t; |
5452e425 | 1327 | const struct xt_table_info *private; |
6b7d31fc | 1328 | int ret = 0; |
5452e425 | 1329 | const void *loc_cpu_entry; |
72b2b1dd | 1330 | struct ip6t_entry *iter; |
7f5c6d4f | 1331 | unsigned int addend; |
3bc3fe5e PM |
1332 | #ifdef CONFIG_COMPAT |
1333 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1334 | |
3bc3fe5e PM |
1335 | if (compat) { |
1336 | ptmp = &compat_tmp; | |
1337 | size = sizeof(struct compat_xt_counters_info); | |
1338 | } else | |
1339 | #endif | |
1340 | { | |
1341 | ptmp = &tmp; | |
1342 | size = sizeof(struct xt_counters_info); | |
1343 | } | |
1344 | ||
1345 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1346 | return -EFAULT; |
1347 | ||
3bc3fe5e PM |
1348 | #ifdef CONFIG_COMPAT |
1349 | if (compat) { | |
1350 | num_counters = compat_tmp.num_counters; | |
1351 | name = compat_tmp.name; | |
1352 | } else | |
1353 | #endif | |
1354 | { | |
1355 | num_counters = tmp.num_counters; | |
1356 | name = tmp.name; | |
1357 | } | |
1358 | ||
1359 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1360 | return -EINVAL; |
1361 | ||
e12f8e29 | 1362 | paddc = vmalloc(len - size); |
1da177e4 LT |
1363 | if (!paddc) |
1364 | return -ENOMEM; | |
1365 | ||
3bc3fe5e | 1366 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1367 | ret = -EFAULT; |
1368 | goto free; | |
1369 | } | |
1370 | ||
336b517f | 1371 | t = xt_find_table_lock(net, AF_INET6, name); |
0cc8d8df | 1372 | if (IS_ERR_OR_NULL(t)) { |
6b7d31fc | 1373 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1374 | goto free; |
6b7d31fc | 1375 | } |
1da177e4 | 1376 | |
942e4a2b SH |
1377 | |
1378 | local_bh_disable(); | |
2e4e6a17 | 1379 | private = t->private; |
3bc3fe5e | 1380 | if (private->number != num_counters) { |
1da177e4 LT |
1381 | ret = -EINVAL; |
1382 | goto unlock_up_free; | |
1383 | } | |
1384 | ||
1385 | i = 0; | |
31836064 | 1386 | /* Choose the copy that is on our node */ |
942e4a2b | 1387 | curcpu = smp_processor_id(); |
7f5c6d4f | 1388 | addend = xt_write_recseq_begin(); |
942e4a2b | 1389 | loc_cpu_entry = private->entries[curcpu]; |
0559518b JE |
1390 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1391 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1392 | ++i; | |
1393 | } | |
7f5c6d4f | 1394 | xt_write_recseq_end(addend); |
942e4a2b | 1395 | |
1da177e4 | 1396 | unlock_up_free: |
942e4a2b | 1397 | local_bh_enable(); |
2e4e6a17 | 1398 | xt_table_unlock(t); |
6b7d31fc | 1399 | module_put(t->me); |
1da177e4 LT |
1400 | free: |
1401 | vfree(paddc); | |
1402 | ||
1403 | return ret; | |
1404 | } | |
1405 | ||
3bc3fe5e PM |
1406 | #ifdef CONFIG_COMPAT |
1407 | struct compat_ip6t_replace { | |
12b00c2c | 1408 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1409 | u32 valid_hooks; |
1410 | u32 num_entries; | |
1411 | u32 size; | |
1412 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1413 | u32 underflow[NF_INET_NUMHOOKS]; | |
1414 | u32 num_counters; | |
87a2e70d | 1415 | compat_uptr_t counters; /* struct xt_counters * */ |
3bc3fe5e PM |
1416 | struct compat_ip6t_entry entries[0]; |
1417 | }; | |
1418 | ||
1419 | static int | |
1420 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1421 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1422 | unsigned int i) |
3bc3fe5e | 1423 | { |
87a2e70d | 1424 | struct xt_entry_target *t; |
3bc3fe5e PM |
1425 | struct compat_ip6t_entry __user *ce; |
1426 | u_int16_t target_offset, next_offset; | |
1427 | compat_uint_t origsize; | |
dcea992a JE |
1428 | const struct xt_entry_match *ematch; |
1429 | int ret = 0; | |
3bc3fe5e | 1430 | |
3bc3fe5e PM |
1431 | origsize = *size; |
1432 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
0559518b JE |
1433 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1434 | copy_to_user(&ce->counters, &counters[i], | |
1435 | sizeof(counters[i])) != 0) | |
1436 | return -EFAULT; | |
3bc3fe5e PM |
1437 | |
1438 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1439 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1440 | ||
dcea992a JE |
1441 | xt_ematch_foreach(ematch, e) { |
1442 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1443 | if (ret != 0) | |
6bdb331b | 1444 | return ret; |
dcea992a | 1445 | } |
3bc3fe5e | 1446 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1447 | t = ip6t_get_target(e); |
1448 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1449 | if (ret) | |
0559518b | 1450 | return ret; |
3bc3fe5e | 1451 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1452 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1453 | put_user(next_offset, &ce->next_offset) != 0) | |
1454 | return -EFAULT; | |
3bc3fe5e | 1455 | return 0; |
3bc3fe5e PM |
1456 | } |
1457 | ||
022748a9 | 1458 | static int |
87a2e70d | 1459 | compat_find_calc_match(struct xt_entry_match *m, |
3bc3fe5e PM |
1460 | const char *name, |
1461 | const struct ip6t_ip6 *ipv6, | |
1462 | unsigned int hookmask, | |
6bdb331b | 1463 | int *size) |
3bc3fe5e PM |
1464 | { |
1465 | struct xt_match *match; | |
1466 | ||
fd0ec0e6 JE |
1467 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
1468 | m->u.user.revision); | |
1469 | if (IS_ERR(match)) { | |
3bc3fe5e PM |
1470 | duprintf("compat_check_calc_match: `%s' not found\n", |
1471 | m->u.user.name); | |
fd0ec0e6 | 1472 | return PTR_ERR(match); |
3bc3fe5e PM |
1473 | } |
1474 | m->u.kernel.match = match; | |
1475 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1476 | return 0; |
1477 | } | |
1478 | ||
0559518b | 1479 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e | 1480 | { |
87a2e70d | 1481 | struct xt_entry_target *t; |
dcea992a | 1482 | struct xt_entry_match *ematch; |
3bc3fe5e | 1483 | |
3bc3fe5e | 1484 | /* Cleanup all matches */ |
dcea992a | 1485 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1486 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1487 | t = compat_ip6t_get_target(e); |
1488 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1489 | } |
1490 | ||
022748a9 | 1491 | static int |
3bc3fe5e PM |
1492 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1493 | struct xt_table_info *newinfo, | |
1494 | unsigned int *size, | |
d5d1baa1 JE |
1495 | const unsigned char *base, |
1496 | const unsigned char *limit, | |
1497 | const unsigned int *hook_entries, | |
1498 | const unsigned int *underflows, | |
3bc3fe5e PM |
1499 | const char *name) |
1500 | { | |
dcea992a | 1501 | struct xt_entry_match *ematch; |
87a2e70d | 1502 | struct xt_entry_target *t; |
3bc3fe5e PM |
1503 | struct xt_target *target; |
1504 | unsigned int entry_offset; | |
b0a6363c PM |
1505 | unsigned int j; |
1506 | int ret, off, h; | |
3bc3fe5e PM |
1507 | |
1508 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1509 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
1510 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
3bc3fe5e PM |
1511 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1512 | return -EINVAL; | |
1513 | } | |
1514 | ||
1515 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1516 | sizeof(struct compat_xt_entry_target)) { | |
1517 | duprintf("checking: element %p size %u\n", | |
1518 | e, e->next_offset); | |
1519 | return -EINVAL; | |
1520 | } | |
1521 | ||
1522 | /* For purposes of check_entry casting the compat entry is fine */ | |
1523 | ret = check_entry((struct ip6t_entry *)e, name); | |
1524 | if (ret) | |
1525 | return ret; | |
1526 | ||
1527 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1528 | entry_offset = (void *)e - (void *)base; | |
1529 | j = 0; | |
dcea992a JE |
1530 | xt_ematch_foreach(ematch, e) { |
1531 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1532 | &e->ipv6, e->comefrom, &off); |
dcea992a | 1533 | if (ret != 0) |
6bdb331b JE |
1534 | goto release_matches; |
1535 | ++j; | |
dcea992a | 1536 | } |
3bc3fe5e PM |
1537 | |
1538 | t = compat_ip6t_get_target(e); | |
d2a7b6ba JE |
1539 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
1540 | t->u.user.revision); | |
1541 | if (IS_ERR(target)) { | |
3bc3fe5e PM |
1542 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
1543 | t->u.user.name); | |
d2a7b6ba | 1544 | ret = PTR_ERR(target); |
3bc3fe5e PM |
1545 | goto release_matches; |
1546 | } | |
1547 | t->u.kernel.target = target; | |
1548 | ||
1549 | off += xt_compat_target_offset(target); | |
1550 | *size += off; | |
1551 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1552 | if (ret) | |
1553 | goto out; | |
1554 | ||
1555 | /* Check hooks & underflows */ | |
1556 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1557 | if ((unsigned char *)e - base == hook_entries[h]) | |
1558 | newinfo->hook_entry[h] = hook_entries[h]; | |
1559 | if ((unsigned char *)e - base == underflows[h]) | |
1560 | newinfo->underflow[h] = underflows[h]; | |
1561 | } | |
1562 | ||
1563 | /* Clear counters and comefrom */ | |
1564 | memset(&e->counters, 0, sizeof(e->counters)); | |
1565 | e->comefrom = 0; | |
3bc3fe5e PM |
1566 | return 0; |
1567 | ||
1568 | out: | |
1569 | module_put(t->u.kernel.target->me); | |
1570 | release_matches: | |
6bdb331b JE |
1571 | xt_ematch_foreach(ematch, e) { |
1572 | if (j-- == 0) | |
dcea992a | 1573 | break; |
6bdb331b JE |
1574 | module_put(ematch->u.kernel.match->me); |
1575 | } | |
3bc3fe5e PM |
1576 | return ret; |
1577 | } | |
1578 | ||
1579 | static int | |
1580 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1581 | unsigned int *size, const char *name, | |
1582 | struct xt_table_info *newinfo, unsigned char *base) | |
1583 | { | |
87a2e70d | 1584 | struct xt_entry_target *t; |
3bc3fe5e PM |
1585 | struct ip6t_entry *de; |
1586 | unsigned int origsize; | |
1587 | int ret, h; | |
dcea992a | 1588 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1589 | |
1590 | ret = 0; | |
1591 | origsize = *size; | |
1592 | de = (struct ip6t_entry *)*dstptr; | |
1593 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1594 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1595 | ||
1596 | *dstptr += sizeof(struct ip6t_entry); | |
1597 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1598 | ||
dcea992a JE |
1599 | xt_ematch_foreach(ematch, e) { |
1600 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1601 | if (ret != 0) | |
6bdb331b | 1602 | return ret; |
dcea992a | 1603 | } |
3bc3fe5e PM |
1604 | de->target_offset = e->target_offset - (origsize - *size); |
1605 | t = compat_ip6t_get_target(e); | |
3bc3fe5e PM |
1606 | xt_compat_target_from_user(t, dstptr, size); |
1607 | ||
1608 | de->next_offset = e->next_offset - (origsize - *size); | |
1609 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1610 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1611 | newinfo->hook_entry[h] -= origsize - *size; | |
1612 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1613 | newinfo->underflow[h] -= origsize - *size; | |
1614 | } | |
1615 | return ret; | |
1616 | } | |
1617 | ||
f54e9367 | 1618 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
0559518b | 1619 | const char *name) |
3bc3fe5e | 1620 | { |
b0a6363c | 1621 | unsigned int j; |
dcea992a | 1622 | int ret = 0; |
9b4fce7a | 1623 | struct xt_mtchk_param mtpar; |
dcea992a | 1624 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1625 | |
1626 | j = 0; | |
f54e9367 | 1627 | mtpar.net = net; |
9b4fce7a JE |
1628 | mtpar.table = name; |
1629 | mtpar.entryinfo = &e->ipv6; | |
1630 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1631 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 1632 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1633 | ret = check_match(ematch, &mtpar); |
dcea992a | 1634 | if (ret != 0) |
6bdb331b JE |
1635 | goto cleanup_matches; |
1636 | ++j; | |
dcea992a | 1637 | } |
3bc3fe5e | 1638 | |
add67461 | 1639 | ret = check_target(e, net, name); |
3bc3fe5e PM |
1640 | if (ret) |
1641 | goto cleanup_matches; | |
3bc3fe5e PM |
1642 | return 0; |
1643 | ||
1644 | cleanup_matches: | |
6bdb331b JE |
1645 | xt_ematch_foreach(ematch, e) { |
1646 | if (j-- == 0) | |
dcea992a | 1647 | break; |
6bdb331b JE |
1648 | cleanup_match(ematch, net); |
1649 | } | |
3bc3fe5e PM |
1650 | return ret; |
1651 | } | |
1652 | ||
1653 | static int | |
f54e9367 AD |
1654 | translate_compat_table(struct net *net, |
1655 | const char *name, | |
3bc3fe5e PM |
1656 | unsigned int valid_hooks, |
1657 | struct xt_table_info **pinfo, | |
1658 | void **pentry0, | |
1659 | unsigned int total_size, | |
1660 | unsigned int number, | |
1661 | unsigned int *hook_entries, | |
1662 | unsigned int *underflows) | |
1663 | { | |
1664 | unsigned int i, j; | |
1665 | struct xt_table_info *newinfo, *info; | |
1666 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1667 | struct compat_ip6t_entry *iter0; |
1668 | struct ip6t_entry *iter1; | |
3bc3fe5e | 1669 | unsigned int size; |
72b2b1dd | 1670 | int ret = 0; |
3bc3fe5e PM |
1671 | |
1672 | info = *pinfo; | |
1673 | entry0 = *pentry0; | |
1674 | size = total_size; | |
1675 | info->number = number; | |
1676 | ||
1677 | /* Init all hooks to impossible value. */ | |
1678 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1679 | info->hook_entry[i] = 0xFFFFFFFF; | |
1680 | info->underflow[i] = 0xFFFFFFFF; | |
1681 | } | |
1682 | ||
1683 | duprintf("translate_compat_table: size %u\n", info->size); | |
1684 | j = 0; | |
1685 | xt_compat_lock(AF_INET6); | |
255d0dc3 | 1686 | xt_compat_init_offsets(AF_INET6, number); |
3bc3fe5e | 1687 | /* Walk through entries, checking offsets. */ |
72b2b1dd JE |
1688 | xt_entry_foreach(iter0, entry0, total_size) { |
1689 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1690 | entry0, |
1691 | entry0 + total_size, | |
1692 | hook_entries, | |
1693 | underflows, | |
1694 | name); | |
72b2b1dd | 1695 | if (ret != 0) |
0559518b JE |
1696 | goto out_unlock; |
1697 | ++j; | |
72b2b1dd | 1698 | } |
3bc3fe5e PM |
1699 | |
1700 | ret = -EINVAL; | |
1701 | if (j != number) { | |
1702 | duprintf("translate_compat_table: %u not %u entries\n", | |
1703 | j, number); | |
1704 | goto out_unlock; | |
1705 | } | |
1706 | ||
1707 | /* Check hooks all assigned */ | |
1708 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1709 | /* Only hooks which are valid */ | |
1710 | if (!(valid_hooks & (1 << i))) | |
1711 | continue; | |
1712 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1713 | duprintf("Invalid hook entry %u %u\n", | |
1714 | i, hook_entries[i]); | |
1715 | goto out_unlock; | |
1716 | } | |
1717 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1718 | duprintf("Invalid underflow %u %u\n", | |
1719 | i, underflows[i]); | |
1720 | goto out_unlock; | |
1721 | } | |
1722 | } | |
1723 | ||
1724 | ret = -ENOMEM; | |
1725 | newinfo = xt_alloc_table_info(size); | |
1726 | if (!newinfo) | |
1727 | goto out_unlock; | |
1728 | ||
1729 | newinfo->number = number; | |
1730 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1731 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1732 | newinfo->underflow[i] = info->underflow[i]; | |
1733 | } | |
1734 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1735 | pos = entry1; | |
1736 | size = total_size; | |
72b2b1dd | 1737 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1738 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1739 | name, newinfo, entry1); | |
72b2b1dd JE |
1740 | if (ret != 0) |
1741 | break; | |
1742 | } | |
3bc3fe5e PM |
1743 | xt_compat_flush_offsets(AF_INET6); |
1744 | xt_compat_unlock(AF_INET6); | |
1745 | if (ret) | |
1746 | goto free_newinfo; | |
1747 | ||
1748 | ret = -ELOOP; | |
1749 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1750 | goto free_newinfo; | |
1751 | ||
1752 | i = 0; | |
72b2b1dd | 1753 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1754 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1755 | if (ret != 0) |
1756 | break; | |
0559518b | 1757 | ++i; |
cca77b7c FW |
1758 | if (strcmp(ip6t_get_target(iter1)->u.user.name, |
1759 | XT_ERROR_TARGET) == 0) | |
1760 | ++newinfo->stacksize; | |
72b2b1dd | 1761 | } |
3bc3fe5e | 1762 | if (ret) { |
72b2b1dd JE |
1763 | /* |
1764 | * The first i matches need cleanup_entry (calls ->destroy) | |
1765 | * because they had called ->check already. The other j-i | |
1766 | * entries need only release. | |
1767 | */ | |
1768 | int skip = i; | |
3bc3fe5e | 1769 | j -= i; |
72b2b1dd JE |
1770 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1771 | if (skip-- > 0) | |
1772 | continue; | |
0559518b | 1773 | if (j-- == 0) |
72b2b1dd | 1774 | break; |
0559518b | 1775 | compat_release_entry(iter0); |
72b2b1dd | 1776 | } |
0559518b JE |
1777 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1778 | if (i-- == 0) | |
72b2b1dd | 1779 | break; |
0559518b JE |
1780 | cleanup_entry(iter1, net); |
1781 | } | |
3bc3fe5e PM |
1782 | xt_free_table_info(newinfo); |
1783 | return ret; | |
1784 | } | |
1785 | ||
1786 | /* And one copy for every other CPU */ | |
1787 | for_each_possible_cpu(i) | |
1788 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1789 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1790 | ||
1791 | *pinfo = newinfo; | |
1792 | *pentry0 = entry1; | |
1793 | xt_free_table_info(info); | |
1794 | return 0; | |
1795 | ||
1796 | free_newinfo: | |
1797 | xt_free_table_info(newinfo); | |
1798 | out: | |
0559518b JE |
1799 | xt_entry_foreach(iter0, entry0, total_size) { |
1800 | if (j-- == 0) | |
72b2b1dd | 1801 | break; |
0559518b JE |
1802 | compat_release_entry(iter0); |
1803 | } | |
3bc3fe5e PM |
1804 | return ret; |
1805 | out_unlock: | |
1806 | xt_compat_flush_offsets(AF_INET6); | |
1807 | xt_compat_unlock(AF_INET6); | |
1808 | goto out; | |
1809 | } | |
1810 | ||
1811 | static int | |
336b517f | 1812 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1813 | { |
1814 | int ret; | |
1815 | struct compat_ip6t_replace tmp; | |
1816 | struct xt_table_info *newinfo; | |
1817 | void *loc_cpu_entry; | |
72b2b1dd | 1818 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1819 | |
1820 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1821 | return -EFAULT; | |
1822 | ||
1823 | /* overflow check */ | |
1824 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1825 | return -ENOMEM; | |
1826 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1827 | return -ENOMEM; | |
1086bbe9 DJ |
1828 | if (tmp.num_counters == 0) |
1829 | return -EINVAL; | |
1830 | ||
6a8ab060 | 1831 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1832 | |
1833 | newinfo = xt_alloc_table_info(tmp.size); | |
1834 | if (!newinfo) | |
1835 | return -ENOMEM; | |
1836 | ||
9c547959 | 1837 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1838 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1839 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1840 | tmp.size) != 0) { | |
1841 | ret = -EFAULT; | |
1842 | goto free_newinfo; | |
1843 | } | |
1844 | ||
f54e9367 | 1845 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1846 | &newinfo, &loc_cpu_entry, tmp.size, |
1847 | tmp.num_entries, tmp.hook_entry, | |
1848 | tmp.underflow); | |
1849 | if (ret != 0) | |
1850 | goto free_newinfo; | |
1851 | ||
1852 | duprintf("compat_do_replace: Translated table\n"); | |
1853 | ||
336b517f | 1854 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1855 | tmp.num_counters, compat_ptr(tmp.counters)); |
1856 | if (ret) | |
1857 | goto free_newinfo_untrans; | |
1858 | return 0; | |
1859 | ||
1860 | free_newinfo_untrans: | |
72b2b1dd | 1861 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1862 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1863 | free_newinfo: |
1864 | xt_free_table_info(newinfo); | |
1865 | return ret; | |
1866 | } | |
1867 | ||
1868 | static int | |
1869 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1870 | unsigned int len) | |
1871 | { | |
1872 | int ret; | |
1873 | ||
af31f412 | 1874 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1875 | return -EPERM; |
1876 | ||
1877 | switch (cmd) { | |
1878 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1879 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1880 | break; |
1881 | ||
1882 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1883 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1884 | break; |
1885 | ||
1886 | default: | |
1887 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1888 | ret = -EINVAL; | |
1889 | } | |
1890 | ||
1891 | return ret; | |
1892 | } | |
1893 | ||
1894 | struct compat_ip6t_get_entries { | |
12b00c2c | 1895 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1896 | compat_uint_t size; |
1897 | struct compat_ip6t_entry entrytable[0]; | |
1898 | }; | |
1899 | ||
1900 | static int | |
1901 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1902 | void __user *userptr) | |
1903 | { | |
1904 | struct xt_counters *counters; | |
5452e425 | 1905 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1906 | void __user *pos; |
1907 | unsigned int size; | |
1908 | int ret = 0; | |
5452e425 | 1909 | const void *loc_cpu_entry; |
3bc3fe5e | 1910 | unsigned int i = 0; |
72b2b1dd | 1911 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1912 | |
1913 | counters = alloc_counters(table); | |
1914 | if (IS_ERR(counters)) | |
1915 | return PTR_ERR(counters); | |
1916 | ||
1917 | /* choose the copy that is on our node/cpu, ... | |
1918 | * This choice is lazy (because current thread is | |
1919 | * allowed to migrate to another cpu) | |
1920 | */ | |
1921 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1922 | pos = userptr; | |
1923 | size = total_size; | |
72b2b1dd JE |
1924 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1925 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1926 | &size, counters, i++); |
72b2b1dd JE |
1927 | if (ret != 0) |
1928 | break; | |
1929 | } | |
3bc3fe5e PM |
1930 | |
1931 | vfree(counters); | |
1932 | return ret; | |
1933 | } | |
1934 | ||
1935 | static int | |
336b517f AD |
1936 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1937 | int *len) | |
3bc3fe5e PM |
1938 | { |
1939 | int ret; | |
1940 | struct compat_ip6t_get_entries get; | |
1941 | struct xt_table *t; | |
1942 | ||
1943 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1944 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1945 | return -EINVAL; |
1946 | } | |
1947 | ||
1948 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1949 | return -EFAULT; | |
1950 | ||
1951 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1952 | duprintf("compat_get_entries: %u != %zu\n", |
1953 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1954 | return -EINVAL; |
1955 | } | |
1956 | ||
1957 | xt_compat_lock(AF_INET6); | |
336b517f | 1958 | t = xt_find_table_lock(net, AF_INET6, get.name); |
0cc8d8df | 1959 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1960 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1961 | struct xt_table_info info; |
9c547959 | 1962 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1963 | ret = compat_table_info(private, &info); |
1964 | if (!ret && get.size == info.size) { | |
1965 | ret = compat_copy_entries_to_user(private->size, | |
1966 | t, uptr->entrytable); | |
1967 | } else if (!ret) { | |
1968 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1969 | private->size, get.size); |
544473c1 | 1970 | ret = -EAGAIN; |
3bc3fe5e PM |
1971 | } |
1972 | xt_compat_flush_offsets(AF_INET6); | |
1973 | module_put(t->me); | |
1974 | xt_table_unlock(t); | |
1975 | } else | |
1976 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1977 | ||
1978 | xt_compat_unlock(AF_INET6); | |
1979 | return ret; | |
1980 | } | |
1981 | ||
1982 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
1983 | ||
1984 | static int | |
1985 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1986 | { | |
1987 | int ret; | |
1988 | ||
af31f412 | 1989 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1990 | return -EPERM; |
1991 | ||
1992 | switch (cmd) { | |
1993 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 1994 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1995 | break; |
1996 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 1997 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
1998 | break; |
1999 | default: | |
2000 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
2001 | } | |
2002 | return ret; | |
2003 | } | |
2004 | #endif | |
2005 | ||
1da177e4 LT |
2006 | static int |
2007 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2008 | { | |
2009 | int ret; | |
2010 | ||
af31f412 | 2011 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2012 | return -EPERM; |
2013 | ||
2014 | switch (cmd) { | |
2015 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2016 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2017 | break; |
2018 | ||
2019 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2020 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2021 | break; |
2022 | ||
2023 | default: | |
2024 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2025 | ret = -EINVAL; | |
2026 | } | |
2027 | ||
2028 | return ret; | |
2029 | } | |
2030 | ||
2031 | static int | |
2032 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2033 | { | |
2034 | int ret; | |
2035 | ||
af31f412 | 2036 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2037 | return -EPERM; |
2038 | ||
2039 | switch (cmd) { | |
433665c9 | 2040 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2041 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2042 | break; |
1da177e4 | 2043 | |
d924357c | 2044 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2045 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2046 | break; |
1da177e4 | 2047 | |
6b7d31fc HW |
2048 | case IP6T_SO_GET_REVISION_MATCH: |
2049 | case IP6T_SO_GET_REVISION_TARGET: { | |
12b00c2c | 2050 | struct xt_get_revision rev; |
2e4e6a17 | 2051 | int target; |
6b7d31fc HW |
2052 | |
2053 | if (*len != sizeof(rev)) { | |
2054 | ret = -EINVAL; | |
2055 | break; | |
2056 | } | |
2057 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2058 | ret = -EFAULT; | |
2059 | break; | |
2060 | } | |
6a8ab060 | 2061 | rev.name[sizeof(rev.name)-1] = 0; |
6b7d31fc HW |
2062 | |
2063 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2064 | target = 1; |
6b7d31fc | 2065 | else |
2e4e6a17 | 2066 | target = 0; |
6b7d31fc | 2067 | |
2e4e6a17 HW |
2068 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2069 | rev.revision, | |
2070 | target, &ret), | |
6b7d31fc HW |
2071 | "ip6t_%s", rev.name); |
2072 | break; | |
2073 | } | |
2074 | ||
1da177e4 LT |
2075 | default: |
2076 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2077 | ret = -EINVAL; | |
2078 | } | |
2079 | ||
2080 | return ret; | |
2081 | } | |
2082 | ||
35aad0ff JE |
2083 | struct xt_table *ip6t_register_table(struct net *net, |
2084 | const struct xt_table *table, | |
336b517f | 2085 | const struct ip6t_replace *repl) |
1da177e4 LT |
2086 | { |
2087 | int ret; | |
2e4e6a17 | 2088 | struct xt_table_info *newinfo; |
f3c5c1bf | 2089 | struct xt_table_info bootstrap = {0}; |
31836064 | 2090 | void *loc_cpu_entry; |
a98da11d | 2091 | struct xt_table *new_table; |
1da177e4 | 2092 | |
2e4e6a17 | 2093 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2094 | if (!newinfo) { |
2095 | ret = -ENOMEM; | |
2096 | goto out; | |
2097 | } | |
1da177e4 | 2098 | |
9c547959 | 2099 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2100 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2101 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2102 | |
0f234214 | 2103 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2104 | if (ret != 0) |
2105 | goto out_free; | |
1da177e4 | 2106 | |
336b517f | 2107 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2108 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2109 | ret = PTR_ERR(new_table); |
2110 | goto out_free; | |
1da177e4 | 2111 | } |
44d34e72 | 2112 | return new_table; |
1da177e4 | 2113 | |
44d34e72 AD |
2114 | out_free: |
2115 | xt_free_table_info(newinfo); | |
2116 | out: | |
2117 | return ERR_PTR(ret); | |
1da177e4 LT |
2118 | } |
2119 | ||
f54e9367 | 2120 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2121 | { |
2e4e6a17 | 2122 | struct xt_table_info *private; |
31836064 | 2123 | void *loc_cpu_entry; |
df200969 | 2124 | struct module *table_owner = table->me; |
72b2b1dd | 2125 | struct ip6t_entry *iter; |
31836064 | 2126 | |
2e4e6a17 | 2127 | private = xt_unregister_table(table); |
1da177e4 LT |
2128 | |
2129 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2130 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2131 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2132 | cleanup_entry(iter, net); |
df200969 AD |
2133 | if (private->number > private->initial_entries) |
2134 | module_put(table_owner); | |
2e4e6a17 | 2135 | xt_free_table_info(private); |
1da177e4 LT |
2136 | } |
2137 | ||
2138 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2139 | static inline bool |
1da177e4 LT |
2140 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2141 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2142 | bool invert) |
1da177e4 LT |
2143 | { |
2144 | return (type == test_type && code >= min_code && code <= max_code) | |
2145 | ^ invert; | |
2146 | } | |
2147 | ||
1d93a9cb | 2148 | static bool |
62fc8051 | 2149 | icmp6_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2150 | { |
5452e425 JE |
2151 | const struct icmp6hdr *ic; |
2152 | struct icmp6hdr _icmph; | |
f7108a20 | 2153 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2154 | |
2155 | /* Must not be a fragment. */ | |
f7108a20 | 2156 | if (par->fragoff != 0) |
1d93a9cb | 2157 | return false; |
1da177e4 | 2158 | |
f7108a20 | 2159 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2160 | if (ic == NULL) { |
2161 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2162 | * can't. Hence, no choice but to drop. |
2163 | */ | |
1da177e4 | 2164 | duprintf("Dropping evil ICMP tinygram.\n"); |
b4ba2611 | 2165 | par->hotdrop = true; |
1d93a9cb | 2166 | return false; |
1da177e4 LT |
2167 | } |
2168 | ||
2169 | return icmp6_type_code_match(icmpinfo->type, | |
2170 | icmpinfo->code[0], | |
2171 | icmpinfo->code[1], | |
2172 | ic->icmp6_type, ic->icmp6_code, | |
2173 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2174 | } | |
2175 | ||
2176 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 2177 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2178 | { |
9b4fce7a | 2179 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2180 | |
7f939713 | 2181 | /* Must specify no unknown invflags */ |
bd414ee6 | 2182 | return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2183 | } |
2184 | ||
2185 | /* The built-in targets: standard (NULL) and error. */ | |
4538506b JE |
2186 | static struct xt_target ip6t_builtin_tg[] __read_mostly = { |
2187 | { | |
243bf6e2 | 2188 | .name = XT_STANDARD_TARGET, |
4538506b JE |
2189 | .targetsize = sizeof(int), |
2190 | .family = NFPROTO_IPV6, | |
3bc3fe5e | 2191 | #ifdef CONFIG_COMPAT |
4538506b JE |
2192 | .compatsize = sizeof(compat_int_t), |
2193 | .compat_from_user = compat_standard_from_user, | |
2194 | .compat_to_user = compat_standard_to_user, | |
3bc3fe5e | 2195 | #endif |
4538506b JE |
2196 | }, |
2197 | { | |
243bf6e2 | 2198 | .name = XT_ERROR_TARGET, |
4538506b | 2199 | .target = ip6t_error, |
12b00c2c | 2200 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
2201 | .family = NFPROTO_IPV6, |
2202 | }, | |
1da177e4 LT |
2203 | }; |
2204 | ||
2205 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2206 | .pf = PF_INET6, | |
2207 | .set_optmin = IP6T_BASE_CTL, | |
2208 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2209 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2210 | #ifdef CONFIG_COMPAT |
2211 | .compat_set = compat_do_ip6t_set_ctl, | |
2212 | #endif | |
1da177e4 LT |
2213 | .get_optmin = IP6T_BASE_CTL, |
2214 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2215 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2216 | #ifdef CONFIG_COMPAT |
2217 | .compat_get = compat_do_ip6t_get_ctl, | |
2218 | #endif | |
16fcec35 | 2219 | .owner = THIS_MODULE, |
1da177e4 LT |
2220 | }; |
2221 | ||
4538506b JE |
2222 | static struct xt_match ip6t_builtin_mt[] __read_mostly = { |
2223 | { | |
2224 | .name = "icmp6", | |
2225 | .match = icmp6_match, | |
2226 | .matchsize = sizeof(struct ip6t_icmp), | |
2227 | .checkentry = icmp6_checkentry, | |
2228 | .proto = IPPROTO_ICMPV6, | |
2229 | .family = NFPROTO_IPV6, | |
2230 | }, | |
1da177e4 LT |
2231 | }; |
2232 | ||
3cb609d5 AD |
2233 | static int __net_init ip6_tables_net_init(struct net *net) |
2234 | { | |
383ca5b8 | 2235 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2236 | } |
2237 | ||
2238 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2239 | { | |
383ca5b8 | 2240 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2241 | } |
2242 | ||
2243 | static struct pernet_operations ip6_tables_net_ops = { | |
2244 | .init = ip6_tables_net_init, | |
2245 | .exit = ip6_tables_net_exit, | |
2246 | }; | |
2247 | ||
65b4b4e8 | 2248 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2249 | { |
2250 | int ret; | |
2251 | ||
3cb609d5 | 2252 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2253 | if (ret < 0) |
2254 | goto err1; | |
2e4e6a17 | 2255 | |
25985edc | 2256 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 2257 | ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 PM |
2258 | if (ret < 0) |
2259 | goto err2; | |
4538506b | 2260 | ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 PM |
2261 | if (ret < 0) |
2262 | goto err4; | |
1da177e4 LT |
2263 | |
2264 | /* Register setsockopt */ | |
2265 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2266 | if (ret < 0) |
2267 | goto err5; | |
1da177e4 | 2268 | |
ff67e4e4 | 2269 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2270 | return 0; |
0eff66e6 PM |
2271 | |
2272 | err5: | |
4538506b | 2273 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 | 2274 | err4: |
4538506b | 2275 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 | 2276 | err2: |
3cb609d5 | 2277 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2278 | err1: |
2279 | return ret; | |
1da177e4 LT |
2280 | } |
2281 | ||
65b4b4e8 | 2282 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2283 | { |
2284 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2285 | |
4538506b JE |
2286 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
2287 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); | |
3cb609d5 | 2288 | unregister_pernet_subsys(&ip6_tables_net_ops); |
1da177e4 LT |
2289 | } |
2290 | ||
2291 | EXPORT_SYMBOL(ip6t_register_table); | |
2292 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2293 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2294 | |
65b4b4e8 AM |
2295 | module_init(ip6_tables_init); |
2296 | module_exit(ip6_tables_fini); |