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Commit | Line | Data |
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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> |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
1da177e4 | 10 | */ |
90e7d4ab | 11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
4fc268d2 | 12 | #include <linux/capability.h> |
14c85021 | 13 | #include <linux/in.h> |
1da177e4 LT |
14 | #include <linux/skbuff.h> |
15 | #include <linux/kmod.h> | |
16 | #include <linux/vmalloc.h> | |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/module.h> | |
4bdbf6c0 | 19 | #include <linux/poison.h> |
1da177e4 | 20 | #include <linux/icmpv6.h> |
1da177e4 | 21 | #include <net/ipv6.h> |
3bc3fe5e | 22 | #include <net/compat.h> |
1da177e4 | 23 | #include <asm/uaccess.h> |
57b47a53 | 24 | #include <linux/mutex.h> |
1da177e4 | 25 | #include <linux/proc_fs.h> |
3bc3fe5e | 26 | #include <linux/err.h> |
c8923c6b | 27 | #include <linux/cpumask.h> |
1da177e4 LT |
28 | |
29 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
2e4e6a17 | 30 | #include <linux/netfilter/x_tables.h> |
f01ffbd6 | 31 | #include <net/netfilter/nf_log.h> |
e3eaa991 | 32 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
33 | |
34 | MODULE_LICENSE("GPL"); | |
35 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
36 | MODULE_DESCRIPTION("IPv6 packet filter"); | |
37 | ||
1da177e4 LT |
38 | /*#define DEBUG_IP_FIREWALL*/ |
39 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
40 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
41 | ||
42 | #ifdef DEBUG_IP_FIREWALL | |
ff67e4e4 | 43 | #define dprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
44 | #else |
45 | #define dprintf(format, args...) | |
46 | #endif | |
47 | ||
48 | #ifdef DEBUG_IP_FIREWALL_USER | |
ff67e4e4 | 49 | #define duprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
50 | #else |
51 | #define duprintf(format, args...) | |
52 | #endif | |
53 | ||
54 | #ifdef CONFIG_NETFILTER_DEBUG | |
af567603 | 55 | #define IP_NF_ASSERT(x) WARN_ON(!(x)) |
1da177e4 LT |
56 | #else |
57 | #define IP_NF_ASSERT(x) | |
58 | #endif | |
1da177e4 | 59 | |
1da177e4 LT |
60 | #if 0 |
61 | /* All the better to debug you with... */ | |
62 | #define static | |
63 | #define inline | |
64 | #endif | |
65 | ||
e3eaa991 JE |
66 | void *ip6t_alloc_initial_table(const struct xt_table *info) |
67 | { | |
68 | return xt_alloc_initial_table(ip6t, IP6T); | |
69 | } | |
70 | EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table); | |
71 | ||
6b7d31fc | 72 | /* |
1da177e4 | 73 | We keep a set of rules for each CPU, so we can avoid write-locking |
6b7d31fc HW |
74 | them in the softirq when updating the counters and therefore |
75 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
76 | context stops packets coming through and allows user context to read | |
77 | the counters or update the rules. | |
1da177e4 | 78 | |
1da177e4 LT |
79 | Hence the start of any table is given by get_table() below. */ |
80 | ||
1da177e4 | 81 | /* Returns whether matches rule or not. */ |
022748a9 | 82 | /* Performance critical - called for every packet */ |
1d93a9cb | 83 | static inline bool |
1da177e4 LT |
84 | ip6_packet_match(const struct sk_buff *skb, |
85 | const char *indev, | |
86 | const char *outdev, | |
87 | const struct ip6t_ip6 *ip6info, | |
88 | unsigned int *protoff, | |
cff533ac | 89 | int *fragoff, bool *hotdrop) |
1da177e4 | 90 | { |
1da177e4 | 91 | unsigned long ret; |
0660e03f | 92 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
1da177e4 | 93 | |
e79ec50b | 94 | #define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg))) |
1da177e4 | 95 | |
f2ffd9ee | 96 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
3666ed1c JP |
97 | &ip6info->src), IP6T_INV_SRCIP) || |
98 | FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, | |
99 | &ip6info->dst), IP6T_INV_DSTIP)) { | |
1da177e4 LT |
100 | dprintf("Source or dest mismatch.\n"); |
101 | /* | |
102 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, | |
103 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, | |
104 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); | |
105 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, | |
106 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, | |
107 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ | |
1d93a9cb | 108 | return false; |
1da177e4 LT |
109 | } |
110 | ||
b8dfe498 | 111 | ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask); |
1da177e4 LT |
112 | |
113 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { | |
114 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
115 | indev, ip6info->iniface, | |
116 | ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":""); | |
1d93a9cb | 117 | return false; |
1da177e4 LT |
118 | } |
119 | ||
b8dfe498 | 120 | ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask); |
1da177e4 LT |
121 | |
122 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { | |
123 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
124 | outdev, ip6info->outiface, | |
125 | ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":""); | |
1d93a9cb | 126 | return false; |
1da177e4 LT |
127 | } |
128 | ||
129 | /* ... might want to do something with class and flowlabel here ... */ | |
130 | ||
131 | /* look for the desired protocol header */ | |
132 | if((ip6info->flags & IP6T_F_PROTO)) { | |
b777e0ce PM |
133 | int protohdr; |
134 | unsigned short _frag_off; | |
1da177e4 | 135 | |
84018f55 | 136 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off, NULL); |
51d8b1a6 PM |
137 | if (protohdr < 0) { |
138 | if (_frag_off == 0) | |
cff533ac | 139 | *hotdrop = true; |
1d93a9cb | 140 | return false; |
51d8b1a6 | 141 | } |
b777e0ce | 142 | *fragoff = _frag_off; |
1da177e4 LT |
143 | |
144 | dprintf("Packet protocol %hi ?= %s%hi.\n", | |
1ab1457c | 145 | protohdr, |
1da177e4 LT |
146 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
147 | ip6info->proto); | |
148 | ||
b777e0ce | 149 | if (ip6info->proto == protohdr) { |
1da177e4 | 150 | if(ip6info->invflags & IP6T_INV_PROTO) { |
1d93a9cb | 151 | return false; |
1da177e4 | 152 | } |
1d93a9cb | 153 | return true; |
1da177e4 LT |
154 | } |
155 | ||
156 | /* We need match for the '-p all', too! */ | |
157 | if ((ip6info->proto != 0) && | |
158 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
1d93a9cb | 159 | return false; |
1da177e4 | 160 | } |
1d93a9cb | 161 | return true; |
1da177e4 LT |
162 | } |
163 | ||
164 | /* should be ip6 safe */ | |
022748a9 | 165 | static bool |
1da177e4 LT |
166 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
167 | { | |
168 | if (ipv6->flags & ~IP6T_F_MASK) { | |
169 | duprintf("Unknown flag bits set: %08X\n", | |
170 | ipv6->flags & ~IP6T_F_MASK); | |
ccb79bdc | 171 | return false; |
1da177e4 LT |
172 | } |
173 | if (ipv6->invflags & ~IP6T_INV_MASK) { | |
174 | duprintf("Unknown invflag bits set: %08X\n", | |
175 | ipv6->invflags & ~IP6T_INV_MASK); | |
ccb79bdc | 176 | return false; |
1da177e4 | 177 | } |
ccb79bdc | 178 | return true; |
1da177e4 LT |
179 | } |
180 | ||
181 | static unsigned int | |
4b560b44 | 182 | ip6t_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 183 | { |
e87cc472 | 184 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
185 | |
186 | return NF_DROP; | |
187 | } | |
188 | ||
1da177e4 | 189 | static inline struct ip6t_entry * |
d5d1baa1 | 190 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
191 | { |
192 | return (struct ip6t_entry *)(base + offset); | |
193 | } | |
194 | ||
ba9dda3a | 195 | /* All zeroes == unconditional rule. */ |
022748a9 | 196 | /* Mildly perf critical (only if packet tracing is on) */ |
47901dc2 | 197 | static inline bool unconditional(const struct ip6t_ip6 *ipv6) |
ba9dda3a | 198 | { |
47901dc2 | 199 | static const struct ip6t_ip6 uncond; |
ba9dda3a | 200 | |
47901dc2 | 201 | return memcmp(ipv6, &uncond, sizeof(uncond)) == 0; |
ba9dda3a JK |
202 | } |
203 | ||
87a2e70d | 204 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
205 | ip6t_get_target_c(const struct ip6t_entry *e) |
206 | { | |
207 | return ip6t_get_target((struct ip6t_entry *)e); | |
208 | } | |
209 | ||
07a93626 | 210 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
ba9dda3a | 211 | /* This cries for unification! */ |
022748a9 | 212 | static const char *const hooknames[] = { |
6e23ae2a PM |
213 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
214 | [NF_INET_LOCAL_IN] = "INPUT", | |
215 | [NF_INET_FORWARD] = "FORWARD", | |
216 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
217 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
218 | }; |
219 | ||
220 | enum nf_ip_trace_comments { | |
221 | NF_IP6_TRACE_COMMENT_RULE, | |
222 | NF_IP6_TRACE_COMMENT_RETURN, | |
223 | NF_IP6_TRACE_COMMENT_POLICY, | |
224 | }; | |
225 | ||
022748a9 | 226 | static const char *const comments[] = { |
ba9dda3a JK |
227 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
228 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
229 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
230 | }; | |
231 | ||
232 | static struct nf_loginfo trace_loginfo = { | |
233 | .type = NF_LOG_TYPE_LOG, | |
234 | .u = { | |
235 | .log = { | |
236 | .level = 4, | |
237 | .logflags = NF_LOG_MASK, | |
238 | }, | |
239 | }, | |
240 | }; | |
241 | ||
022748a9 | 242 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 243 | static inline int |
d5d1baa1 | 244 | get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e, |
4f2f6f23 JE |
245 | const char *hookname, const char **chainname, |
246 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 247 | { |
87a2e70d | 248 | const struct xt_standard_target *t = (void *)ip6t_get_target_c(s); |
ba9dda3a | 249 | |
243bf6e2 | 250 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
251 | /* Head of user chain: ERROR target with chainname */ |
252 | *chainname = t->target.data; | |
253 | (*rulenum) = 0; | |
254 | } else if (s == e) { | |
255 | (*rulenum)++; | |
256 | ||
3666ed1c JP |
257 | if (s->target_offset == sizeof(struct ip6t_entry) && |
258 | strcmp(t->target.u.kernel.target->name, | |
243bf6e2 | 259 | XT_STANDARD_TARGET) == 0 && |
3666ed1c JP |
260 | t->verdict < 0 && |
261 | unconditional(&s->ipv6)) { | |
ba9dda3a JK |
262 | /* Tail of chains: STANDARD target (return/policy) */ |
263 | *comment = *chainname == hookname | |
4f2f6f23 JE |
264 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
265 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
266 | } |
267 | return 1; | |
268 | } else | |
269 | (*rulenum)++; | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
d5d1baa1 | 274 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
275 | unsigned int hook, |
276 | const struct net_device *in, | |
277 | const struct net_device *out, | |
ecb6f85e | 278 | const char *tablename, |
d5d1baa1 JE |
279 | const struct xt_table_info *private, |
280 | const struct ip6t_entry *e) | |
ba9dda3a | 281 | { |
d5d1baa1 | 282 | const void *table_base; |
5452e425 | 283 | const struct ip6t_entry *root; |
4f2f6f23 | 284 | const char *hookname, *chainname, *comment; |
72b2b1dd | 285 | const struct ip6t_entry *iter; |
ba9dda3a | 286 | unsigned int rulenum = 0; |
30e0c6a6 | 287 | struct net *net = dev_net(in ? in : out); |
ba9dda3a | 288 | |
ccf5bd8c | 289 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
290 | root = get_entry(table_base, private->hook_entry[hook]); |
291 | ||
4f2f6f23 JE |
292 | hookname = chainname = hooknames[hook]; |
293 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; | |
ba9dda3a | 294 | |
72b2b1dd JE |
295 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
296 | if (get_chainname_rulenum(iter, e, hookname, | |
297 | &chainname, &comment, &rulenum) != 0) | |
298 | break; | |
ba9dda3a | 299 | |
30e0c6a6 | 300 | nf_log_packet(net, AF_INET6, hook, skb, in, out, &trace_loginfo, |
ba9dda3a JK |
301 | "TRACE: %s:%s:%s:%u ", |
302 | tablename, chainname, comment, rulenum); | |
303 | } | |
304 | #endif | |
305 | ||
98e86403 JE |
306 | static inline __pure struct ip6t_entry * |
307 | ip6t_next_entry(const struct ip6t_entry *entry) | |
308 | { | |
309 | return (void *)entry + entry->next_offset; | |
310 | } | |
311 | ||
1da177e4 LT |
312 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
313 | unsigned int | |
3db05fea | 314 | ip6t_do_table(struct sk_buff *skb, |
1da177e4 LT |
315 | unsigned int hook, |
316 | const struct net_device *in, | |
317 | const struct net_device *out, | |
fe1cb108 | 318 | struct xt_table *table) |
1da177e4 | 319 | { |
6b7d31fc | 320 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
321 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
322 | unsigned int verdict = NF_DROP; | |
323 | const char *indev, *outdev; | |
d5d1baa1 | 324 | const void *table_base; |
f3c5c1bf JE |
325 | struct ip6t_entry *e, **jumpstack; |
326 | unsigned int *stackptr, origptr, cpu; | |
d5d1baa1 | 327 | const struct xt_table_info *private; |
de74c169 | 328 | struct xt_action_param acpar; |
7f5c6d4f | 329 | unsigned int addend; |
1da177e4 LT |
330 | |
331 | /* Initialization */ | |
332 | indev = in ? in->name : nulldevname; | |
333 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
334 | /* We handle fragments by dealing with the first fragment as |
335 | * if it was a normal packet. All other fragments are treated | |
336 | * normally, except that they will NEVER match rules that ask | |
337 | * things we don't know, ie. tcp syn flag or ports). If the | |
338 | * rule is also a fragment-specific rule, non-fragments won't | |
339 | * match it. */ | |
b4ba2611 | 340 | acpar.hotdrop = false; |
de74c169 JE |
341 | acpar.in = in; |
342 | acpar.out = out; | |
343 | acpar.family = NFPROTO_IPV6; | |
344 | acpar.hooknum = hook; | |
1da177e4 | 345 | |
1da177e4 | 346 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
78454473 | 347 | |
7f5c6d4f ED |
348 | local_bh_disable(); |
349 | addend = xt_write_recseq_begin(); | |
942e4a2b | 350 | private = table->private; |
f3c5c1bf JE |
351 | cpu = smp_processor_id(); |
352 | table_base = private->entries[cpu]; | |
353 | jumpstack = (struct ip6t_entry **)private->jumpstack[cpu]; | |
7489aec8 | 354 | stackptr = per_cpu_ptr(private->stackptr, cpu); |
f3c5c1bf | 355 | origptr = *stackptr; |
78454473 | 356 | |
2e4e6a17 | 357 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 358 | |
1da177e4 | 359 | do { |
87a2e70d | 360 | const struct xt_entry_target *t; |
dcea992a | 361 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 362 | |
1da177e4 | 363 | IP_NF_ASSERT(e); |
84018f55 | 364 | acpar.thoff = 0; |
a1ff4ac8 | 365 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
b4ba2611 | 366 | &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) { |
dcea992a | 367 | no_match: |
a1ff4ac8 JE |
368 | e = ip6t_next_entry(e); |
369 | continue; | |
370 | } | |
1da177e4 | 371 | |
ef53d702 | 372 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
373 | acpar.match = ematch->u.kernel.match; |
374 | acpar.matchinfo = ematch->data; | |
375 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 376 | goto no_match; |
ef53d702 | 377 | } |
dcea992a | 378 | |
261abc8c | 379 | ADD_COUNTER(e->counters, skb->len, 1); |
1da177e4 | 380 | |
d5d1baa1 | 381 | t = ip6t_get_target_c(e); |
a1ff4ac8 | 382 | IP_NF_ASSERT(t->u.kernel.target); |
ba9dda3a | 383 | |
07a93626 | 384 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
385 | /* The packet is traced: log it */ |
386 | if (unlikely(skb->nf_trace)) | |
387 | trace_packet(skb, hook, in, out, | |
388 | table->name, private, e); | |
ba9dda3a | 389 | #endif |
a1ff4ac8 JE |
390 | /* Standard target? */ |
391 | if (!t->u.kernel.target->target) { | |
392 | int v; | |
393 | ||
87a2e70d | 394 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
395 | if (v < 0) { |
396 | /* Pop from stack? */ | |
243bf6e2 | 397 | if (v != XT_RETURN) { |
95c96174 | 398 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 399 | break; |
1da177e4 | 400 | } |
db856674 | 401 | if (*stackptr <= origptr) |
f3c5c1bf JE |
402 | e = get_entry(table_base, |
403 | private->underflow[hook]); | |
404 | else | |
405 | e = ip6t_next_entry(jumpstack[--*stackptr]); | |
a1ff4ac8 JE |
406 | continue; |
407 | } | |
3666ed1c JP |
408 | if (table_base + v != ip6t_next_entry(e) && |
409 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
f3c5c1bf JE |
410 | if (*stackptr >= private->stacksize) { |
411 | verdict = NF_DROP; | |
412 | break; | |
413 | } | |
414 | jumpstack[(*stackptr)++] = e; | |
a1ff4ac8 | 415 | } |
1da177e4 | 416 | |
a1ff4ac8 | 417 | e = get_entry(table_base, v); |
7a6b1c46 JE |
418 | continue; |
419 | } | |
420 | ||
de74c169 JE |
421 | acpar.target = t->u.kernel.target; |
422 | acpar.targinfo = t->data; | |
7eb35586 | 423 | |
de74c169 | 424 | verdict = t->u.kernel.target->target(skb, &acpar); |
243bf6e2 | 425 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
426 | e = ip6t_next_entry(e); |
427 | else | |
428 | /* Verdict */ | |
429 | break; | |
b4ba2611 | 430 | } while (!acpar.hotdrop); |
1da177e4 | 431 | |
f3c5c1bf | 432 | *stackptr = origptr; |
7f5c6d4f ED |
433 | |
434 | xt_write_recseq_end(addend); | |
435 | local_bh_enable(); | |
1da177e4 LT |
436 | |
437 | #ifdef DEBUG_ALLOW_ALL | |
438 | return NF_ACCEPT; | |
439 | #else | |
b4ba2611 | 440 | if (acpar.hotdrop) |
1da177e4 LT |
441 | return NF_DROP; |
442 | else return verdict; | |
443 | #endif | |
444 | } | |
445 | ||
1da177e4 LT |
446 | /* Figures out from what hook each rule can be called: returns 0 if |
447 | there are loops. Puts hook bitmask in comefrom. */ | |
448 | static int | |
d5d1baa1 | 449 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 450 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
451 | { |
452 | unsigned int hook; | |
453 | ||
454 | /* No recursion; use packet counter to save back ptrs (reset | |
455 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 456 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 457 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 458 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
459 | |
460 | if (!(valid_hooks & (1 << hook))) | |
461 | continue; | |
462 | ||
463 | /* Set initial back pointer. */ | |
464 | e->counters.pcnt = pos; | |
465 | ||
466 | for (;;) { | |
87a2e70d | 467 | const struct xt_standard_target *t |
d5d1baa1 | 468 | = (void *)ip6t_get_target_c(e); |
9c547959 | 469 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 470 | |
6e23ae2a | 471 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
654d0fbd | 472 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
473 | hook, pos, e->comefrom); |
474 | return 0; | |
475 | } | |
9c547959 | 476 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
477 | |
478 | /* Unconditional return/END. */ | |
3666ed1c JP |
479 | if ((e->target_offset == sizeof(struct ip6t_entry) && |
480 | (strcmp(t->target.u.user.name, | |
243bf6e2 | 481 | XT_STANDARD_TARGET) == 0) && |
3666ed1c JP |
482 | t->verdict < 0 && |
483 | unconditional(&e->ipv6)) || visited) { | |
1da177e4 LT |
484 | unsigned int oldpos, size; |
485 | ||
1f9352ae | 486 | if ((strcmp(t->target.u.user.name, |
243bf6e2 | 487 | XT_STANDARD_TARGET) == 0) && |
1f9352ae | 488 | t->verdict < -NF_MAX_VERDICT - 1) { |
74c9c0c1 DM |
489 | duprintf("mark_source_chains: bad " |
490 | "negative verdict (%i)\n", | |
491 | t->verdict); | |
492 | return 0; | |
493 | } | |
494 | ||
1da177e4 LT |
495 | /* Return: backtrack through the last |
496 | big jump. */ | |
497 | do { | |
6e23ae2a | 498 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
499 | #ifdef DEBUG_IP_FIREWALL_USER |
500 | if (e->comefrom | |
6e23ae2a | 501 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
502 | duprintf("Back unset " |
503 | "on hook %u " | |
504 | "rule %u\n", | |
505 | hook, pos); | |
506 | } | |
507 | #endif | |
508 | oldpos = pos; | |
509 | pos = e->counters.pcnt; | |
510 | e->counters.pcnt = 0; | |
511 | ||
512 | /* We're at the start. */ | |
513 | if (pos == oldpos) | |
514 | goto next; | |
515 | ||
516 | e = (struct ip6t_entry *) | |
31836064 | 517 | (entry0 + pos); |
1da177e4 LT |
518 | } while (oldpos == pos + e->next_offset); |
519 | ||
520 | /* Move along one */ | |
521 | size = e->next_offset; | |
522 | e = (struct ip6t_entry *) | |
31836064 | 523 | (entry0 + pos + size); |
1da177e4 LT |
524 | e->counters.pcnt = pos; |
525 | pos += size; | |
526 | } else { | |
527 | int newpos = t->verdict; | |
528 | ||
529 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 530 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 531 | newpos >= 0) { |
74c9c0c1 DM |
532 | if (newpos > newinfo->size - |
533 | sizeof(struct ip6t_entry)) { | |
534 | duprintf("mark_source_chains: " | |
535 | "bad verdict (%i)\n", | |
536 | newpos); | |
537 | return 0; | |
538 | } | |
1da177e4 LT |
539 | /* This a jump; chase it. */ |
540 | duprintf("Jump rule %u -> %u\n", | |
541 | pos, newpos); | |
542 | } else { | |
543 | /* ... this is a fallthru */ | |
544 | newpos = pos + e->next_offset; | |
545 | } | |
546 | e = (struct ip6t_entry *) | |
31836064 | 547 | (entry0 + newpos); |
1da177e4 LT |
548 | e->counters.pcnt = pos; |
549 | pos = newpos; | |
550 | } | |
551 | } | |
552 | next: | |
553 | duprintf("Finished chain %u\n", hook); | |
554 | } | |
555 | return 1; | |
556 | } | |
557 | ||
87a2e70d | 558 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 559 | { |
6be3d859 JE |
560 | struct xt_mtdtor_param par; |
561 | ||
f54e9367 | 562 | par.net = net; |
6be3d859 JE |
563 | par.match = m->u.kernel.match; |
564 | par.matchinfo = m->data; | |
916a917d | 565 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
566 | if (par.match->destroy != NULL) |
567 | par.match->destroy(&par); | |
568 | module_put(par.match->me); | |
1da177e4 LT |
569 | } |
570 | ||
022748a9 | 571 | static int |
d5d1baa1 | 572 | check_entry(const struct ip6t_entry *e, const char *name) |
f173c8a1 | 573 | { |
87a2e70d | 574 | const struct xt_entry_target *t; |
f173c8a1 PM |
575 | |
576 | if (!ip6_checkentry(&e->ipv6)) { | |
577 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
578 | return -EINVAL; | |
579 | } | |
580 | ||
87a2e70d | 581 | if (e->target_offset + sizeof(struct xt_entry_target) > |
f173c8a1 PM |
582 | e->next_offset) |
583 | return -EINVAL; | |
584 | ||
d5d1baa1 | 585 | t = ip6t_get_target_c(e); |
f173c8a1 PM |
586 | if (e->target_offset + t->u.target_size > e->next_offset) |
587 | return -EINVAL; | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
87a2e70d | 592 | static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
f173c8a1 | 593 | { |
9b4fce7a | 594 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
595 | int ret; |
596 | ||
9b4fce7a JE |
597 | par->match = m->u.kernel.match; |
598 | par->matchinfo = m->data; | |
599 | ||
916a917d | 600 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 601 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
367c6790 | 602 | if (ret < 0) { |
f173c8a1 | 603 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 604 | par.match->name); |
367c6790 | 605 | return ret; |
f173c8a1 | 606 | } |
367c6790 | 607 | return 0; |
f173c8a1 PM |
608 | } |
609 | ||
022748a9 | 610 | static int |
87a2e70d | 611 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 612 | { |
6709dbbb | 613 | struct xt_match *match; |
3cdc7c95 | 614 | int ret; |
1da177e4 | 615 | |
fd0ec0e6 JE |
616 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
617 | m->u.user.revision); | |
618 | if (IS_ERR(match)) { | |
f173c8a1 | 619 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 620 | return PTR_ERR(match); |
1da177e4 LT |
621 | } |
622 | m->u.kernel.match = match; | |
1da177e4 | 623 | |
6bdb331b | 624 | ret = check_match(m, par); |
3cdc7c95 PM |
625 | if (ret) |
626 | goto err; | |
627 | ||
1da177e4 | 628 | return 0; |
3cdc7c95 PM |
629 | err: |
630 | module_put(m->u.kernel.match->me); | |
631 | return ret; | |
1da177e4 LT |
632 | } |
633 | ||
add67461 | 634 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 635 | { |
87a2e70d | 636 | struct xt_entry_target *t = ip6t_get_target(e); |
af5d6dc2 | 637 | struct xt_tgchk_param par = { |
add67461 | 638 | .net = net, |
af5d6dc2 JE |
639 | .table = name, |
640 | .entryinfo = e, | |
641 | .target = t->u.kernel.target, | |
642 | .targinfo = t->data, | |
643 | .hook_mask = e->comefrom, | |
916a917d | 644 | .family = NFPROTO_IPV6, |
af5d6dc2 | 645 | }; |
1da177e4 | 646 | int ret; |
1da177e4 | 647 | |
f173c8a1 | 648 | t = ip6t_get_target(e); |
916a917d | 649 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 650 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
367c6790 | 651 | if (ret < 0) { |
f173c8a1 PM |
652 | duprintf("ip_tables: check failed for `%s'.\n", |
653 | t->u.kernel.target->name); | |
367c6790 | 654 | return ret; |
1da177e4 | 655 | } |
367c6790 | 656 | return 0; |
f173c8a1 | 657 | } |
1da177e4 | 658 | |
022748a9 | 659 | static int |
a83d8e8d | 660 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
0559518b | 661 | unsigned int size) |
f173c8a1 | 662 | { |
87a2e70d | 663 | struct xt_entry_target *t; |
f173c8a1 PM |
664 | struct xt_target *target; |
665 | int ret; | |
666 | unsigned int j; | |
9b4fce7a | 667 | struct xt_mtchk_param mtpar; |
dcea992a | 668 | struct xt_entry_match *ematch; |
f173c8a1 PM |
669 | |
670 | ret = check_entry(e, name); | |
671 | if (ret) | |
672 | return ret; | |
590bdf7f | 673 | |
1da177e4 | 674 | j = 0; |
a83d8e8d | 675 | mtpar.net = net; |
9b4fce7a JE |
676 | mtpar.table = name; |
677 | mtpar.entryinfo = &e->ipv6; | |
678 | mtpar.hook_mask = e->comefrom; | |
916a917d | 679 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 680 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 681 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 682 | if (ret != 0) |
6bdb331b JE |
683 | goto cleanup_matches; |
684 | ++j; | |
dcea992a | 685 | } |
1da177e4 LT |
686 | |
687 | t = ip6t_get_target(e); | |
d2a7b6ba JE |
688 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
689 | t->u.user.revision); | |
690 | if (IS_ERR(target)) { | |
f173c8a1 | 691 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 692 | ret = PTR_ERR(target); |
1da177e4 LT |
693 | goto cleanup_matches; |
694 | } | |
695 | t->u.kernel.target = target; | |
6b7d31fc | 696 | |
add67461 | 697 | ret = check_target(e, net, name); |
3cdc7c95 PM |
698 | if (ret) |
699 | goto err; | |
1da177e4 | 700 | return 0; |
3cdc7c95 PM |
701 | err: |
702 | module_put(t->u.kernel.target->me); | |
1da177e4 | 703 | cleanup_matches: |
6bdb331b JE |
704 | xt_ematch_foreach(ematch, e) { |
705 | if (j-- == 0) | |
dcea992a | 706 | break; |
6bdb331b JE |
707 | cleanup_match(ematch, net); |
708 | } | |
1da177e4 LT |
709 | return ret; |
710 | } | |
711 | ||
d5d1baa1 | 712 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 | 713 | { |
87a2e70d | 714 | const struct xt_entry_target *t; |
e2fe35c1 JE |
715 | unsigned int verdict; |
716 | ||
717 | if (!unconditional(&e->ipv6)) | |
718 | return false; | |
d5d1baa1 | 719 | t = ip6t_get_target_c(e); |
e2fe35c1 JE |
720 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
721 | return false; | |
87a2e70d | 722 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
723 | verdict = -verdict - 1; |
724 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
725 | } | |
726 | ||
022748a9 | 727 | static int |
1da177e4 | 728 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 729 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
730 | const unsigned char *base, |
731 | const unsigned char *limit, | |
1da177e4 LT |
732 | const unsigned int *hook_entries, |
733 | const unsigned int *underflows, | |
0559518b | 734 | unsigned int valid_hooks) |
1da177e4 LT |
735 | { |
736 | unsigned int h; | |
737 | ||
3666ed1c JP |
738 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
739 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
1da177e4 LT |
740 | duprintf("Bad offset %p\n", e); |
741 | return -EINVAL; | |
742 | } | |
743 | ||
744 | if (e->next_offset | |
87a2e70d | 745 | < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) { |
1da177e4 LT |
746 | duprintf("checking: element %p size %u\n", |
747 | e, e->next_offset); | |
748 | return -EINVAL; | |
749 | } | |
750 | ||
751 | /* Check hooks & underflows */ | |
6e23ae2a | 752 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
753 | if (!(valid_hooks & (1 << h))) |
754 | continue; | |
1da177e4 LT |
755 | if ((unsigned char *)e - base == hook_entries[h]) |
756 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 757 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
758 | if (!check_underflow(e)) { |
759 | pr_err("Underflows must be unconditional and " | |
760 | "use the STANDARD target with " | |
761 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
762 | return -EINVAL; |
763 | } | |
1da177e4 | 764 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 765 | } |
1da177e4 LT |
766 | } |
767 | ||
1da177e4 | 768 | /* Clear counters and comefrom */ |
2e4e6a17 | 769 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 770 | e->comefrom = 0; |
1da177e4 LT |
771 | return 0; |
772 | } | |
773 | ||
0559518b | 774 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
1da177e4 | 775 | { |
a2df1648 | 776 | struct xt_tgdtor_param par; |
87a2e70d | 777 | struct xt_entry_target *t; |
dcea992a | 778 | struct xt_entry_match *ematch; |
1da177e4 | 779 | |
1da177e4 | 780 | /* Cleanup all matches */ |
dcea992a | 781 | xt_ematch_foreach(ematch, e) |
6bdb331b | 782 | cleanup_match(ematch, net); |
1da177e4 | 783 | t = ip6t_get_target(e); |
a2df1648 | 784 | |
add67461 | 785 | par.net = net; |
a2df1648 JE |
786 | par.target = t->u.kernel.target; |
787 | par.targinfo = t->data; | |
916a917d | 788 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
789 | if (par.target->destroy != NULL) |
790 | par.target->destroy(&par); | |
791 | module_put(par.target->me); | |
1da177e4 LT |
792 | } |
793 | ||
794 | /* Checks and translates the user-supplied table segment (held in | |
795 | newinfo) */ | |
796 | static int | |
0f234214 JE |
797 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
798 | const struct ip6t_replace *repl) | |
1da177e4 | 799 | { |
72b2b1dd | 800 | struct ip6t_entry *iter; |
1da177e4 | 801 | unsigned int i; |
72b2b1dd | 802 | int ret = 0; |
1da177e4 | 803 | |
0f234214 JE |
804 | newinfo->size = repl->size; |
805 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
806 | |
807 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 808 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
809 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
810 | newinfo->underflow[i] = 0xFFFFFFFF; | |
811 | } | |
812 | ||
813 | duprintf("translate_table: size %u\n", newinfo->size); | |
814 | i = 0; | |
815 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
816 | xt_entry_foreach(iter, entry0, newinfo->size) { |
817 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
818 | entry0 + repl->size, |
819 | repl->hook_entry, | |
820 | repl->underflow, | |
821 | repl->valid_hooks); | |
72b2b1dd | 822 | if (ret != 0) |
0559518b JE |
823 | return ret; |
824 | ++i; | |
f3c5c1bf JE |
825 | if (strcmp(ip6t_get_target(iter)->u.user.name, |
826 | XT_ERROR_TARGET) == 0) | |
827 | ++newinfo->stacksize; | |
72b2b1dd | 828 | } |
1da177e4 | 829 | |
0f234214 | 830 | if (i != repl->num_entries) { |
1da177e4 | 831 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 832 | i, repl->num_entries); |
1da177e4 LT |
833 | return -EINVAL; |
834 | } | |
835 | ||
836 | /* Check hooks all assigned */ | |
6e23ae2a | 837 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 838 | /* Only hooks which are valid */ |
0f234214 | 839 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
840 | continue; |
841 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
842 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 843 | i, repl->hook_entry[i]); |
1da177e4 LT |
844 | return -EINVAL; |
845 | } | |
846 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
847 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 848 | i, repl->underflow[i]); |
1da177e4 LT |
849 | return -EINVAL; |
850 | } | |
851 | } | |
852 | ||
0f234214 | 853 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
854 | return -ELOOP; |
855 | ||
1da177e4 LT |
856 | /* Finally, each sanity check must pass */ |
857 | i = 0; | |
72b2b1dd | 858 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 859 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
860 | if (ret != 0) |
861 | break; | |
0559518b | 862 | ++i; |
72b2b1dd | 863 | } |
1da177e4 | 864 | |
74c9c0c1 | 865 | if (ret != 0) { |
0559518b JE |
866 | xt_entry_foreach(iter, entry0, newinfo->size) { |
867 | if (i-- == 0) | |
72b2b1dd | 868 | break; |
0559518b JE |
869 | cleanup_entry(iter, net); |
870 | } | |
74c9c0c1 DM |
871 | return ret; |
872 | } | |
1da177e4 LT |
873 | |
874 | /* And one copy for every other CPU */ | |
6f912042 | 875 | for_each_possible_cpu(i) { |
31836064 ED |
876 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
877 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
878 | } |
879 | ||
9c547959 | 880 | return ret; |
1da177e4 LT |
881 | } |
882 | ||
1da177e4 | 883 | static void |
2e4e6a17 HW |
884 | get_counters(const struct xt_table_info *t, |
885 | struct xt_counters counters[]) | |
1da177e4 | 886 | { |
72b2b1dd | 887 | struct ip6t_entry *iter; |
1da177e4 LT |
888 | unsigned int cpu; |
889 | unsigned int i; | |
890 | ||
6f912042 | 891 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 892 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 893 | |
1da177e4 | 894 | i = 0; |
0559518b | 895 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
83723d60 ED |
896 | u64 bcnt, pcnt; |
897 | unsigned int start; | |
898 | ||
899 | do { | |
7f5c6d4f | 900 | start = read_seqcount_begin(s); |
83723d60 ED |
901 | bcnt = iter->counters.bcnt; |
902 | pcnt = iter->counters.pcnt; | |
7f5c6d4f | 903 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
904 | |
905 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
906 | ++i; |
907 | } | |
1da177e4 | 908 | } |
78454473 SH |
909 | } |
910 | ||
d5d1baa1 | 911 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 912 | { |
ed1a6f5e | 913 | unsigned int countersize; |
2e4e6a17 | 914 | struct xt_counters *counters; |
d5d1baa1 | 915 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
916 | |
917 | /* We need atomic snapshot of counters: rest doesn't change | |
918 | (other than comefrom, which userspace doesn't care | |
919 | about). */ | |
2e4e6a17 | 920 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 921 | counters = vzalloc(countersize); |
1da177e4 LT |
922 | |
923 | if (counters == NULL) | |
942e4a2b | 924 | return ERR_PTR(-ENOMEM); |
78454473 | 925 | |
942e4a2b | 926 | get_counters(private, counters); |
78454473 | 927 | |
49a88d18 | 928 | return counters; |
ed1a6f5e PM |
929 | } |
930 | ||
931 | static int | |
932 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 933 | const struct xt_table *table, |
ed1a6f5e PM |
934 | void __user *userptr) |
935 | { | |
936 | unsigned int off, num; | |
d5d1baa1 | 937 | const struct ip6t_entry *e; |
ed1a6f5e | 938 | struct xt_counters *counters; |
5452e425 | 939 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 940 | int ret = 0; |
5452e425 | 941 | const void *loc_cpu_entry; |
ed1a6f5e PM |
942 | |
943 | counters = alloc_counters(table); | |
944 | if (IS_ERR(counters)) | |
945 | return PTR_ERR(counters); | |
946 | ||
9c547959 PM |
947 | /* choose the copy that is on our node/cpu, ... |
948 | * This choice is lazy (because current thread is | |
949 | * allowed to migrate to another cpu) | |
950 | */ | |
2e4e6a17 | 951 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 952 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
953 | ret = -EFAULT; |
954 | goto free_counters; | |
955 | } | |
956 | ||
957 | /* FIXME: use iterator macros --RR */ | |
958 | /* ... then go back and fix counters and names */ | |
959 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
960 | unsigned int i; | |
87a2e70d JE |
961 | const struct xt_entry_match *m; |
962 | const struct xt_entry_target *t; | |
1da177e4 | 963 | |
31836064 | 964 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
965 | if (copy_to_user(userptr + off |
966 | + offsetof(struct ip6t_entry, counters), | |
967 | &counters[num], | |
968 | sizeof(counters[num])) != 0) { | |
969 | ret = -EFAULT; | |
970 | goto free_counters; | |
971 | } | |
972 | ||
973 | for (i = sizeof(struct ip6t_entry); | |
974 | i < e->target_offset; | |
975 | i += m->u.match_size) { | |
976 | m = (void *)e + i; | |
977 | ||
978 | if (copy_to_user(userptr + off + i | |
87a2e70d | 979 | + offsetof(struct xt_entry_match, |
1da177e4 LT |
980 | u.user.name), |
981 | m->u.kernel.match->name, | |
982 | strlen(m->u.kernel.match->name)+1) | |
983 | != 0) { | |
984 | ret = -EFAULT; | |
985 | goto free_counters; | |
986 | } | |
987 | } | |
988 | ||
d5d1baa1 | 989 | t = ip6t_get_target_c(e); |
1da177e4 | 990 | if (copy_to_user(userptr + off + e->target_offset |
87a2e70d | 991 | + offsetof(struct xt_entry_target, |
1da177e4 LT |
992 | u.user.name), |
993 | t->u.kernel.target->name, | |
994 | strlen(t->u.kernel.target->name)+1) != 0) { | |
995 | ret = -EFAULT; | |
996 | goto free_counters; | |
997 | } | |
998 | } | |
999 | ||
1000 | free_counters: | |
1001 | vfree(counters); | |
1002 | return ret; | |
1003 | } | |
1004 | ||
3bc3fe5e | 1005 | #ifdef CONFIG_COMPAT |
739674fb | 1006 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
1007 | { |
1008 | int v = *(compat_int_t *)src; | |
1009 | ||
1010 | if (v > 0) | |
1011 | v += xt_compat_calc_jump(AF_INET6, v); | |
1012 | memcpy(dst, &v, sizeof(v)); | |
1013 | } | |
1014 | ||
739674fb | 1015 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
1016 | { |
1017 | compat_int_t cv = *(int *)src; | |
1018 | ||
1019 | if (cv > 0) | |
1020 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1021 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1022 | } | |
1023 | ||
d5d1baa1 | 1024 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 1025 | const struct xt_table_info *info, |
d5d1baa1 | 1026 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 1027 | { |
dcea992a | 1028 | const struct xt_entry_match *ematch; |
87a2e70d | 1029 | const struct xt_entry_target *t; |
3bc3fe5e PM |
1030 | unsigned int entry_offset; |
1031 | int off, i, ret; | |
1032 | ||
1033 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1034 | entry_offset = (void *)e - base; | |
dcea992a | 1035 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1036 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1037 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
1038 | off += xt_compat_target_offset(t->u.kernel.target); |
1039 | newinfo->size -= off; | |
1040 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1041 | if (ret) | |
1042 | return ret; | |
1043 | ||
1044 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1045 | if (info->hook_entry[i] && | |
1046 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1047 | newinfo->hook_entry[i] -= off; | |
1048 | if (info->underflow[i] && | |
1049 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1050 | newinfo->underflow[i] -= off; | |
1051 | } | |
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | static int compat_table_info(const struct xt_table_info *info, | |
1056 | struct xt_table_info *newinfo) | |
1057 | { | |
72b2b1dd | 1058 | struct ip6t_entry *iter; |
3bc3fe5e | 1059 | void *loc_cpu_entry; |
0559518b | 1060 | int ret; |
3bc3fe5e PM |
1061 | |
1062 | if (!newinfo || !info) | |
1063 | return -EINVAL; | |
1064 | ||
1065 | /* we dont care about newinfo->entries[] */ | |
1066 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1067 | newinfo->initial_entries = 0; | |
1068 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
255d0dc3 | 1069 | xt_compat_init_offsets(AF_INET6, info->number); |
72b2b1dd JE |
1070 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1071 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1072 | if (ret != 0) | |
0559518b | 1073 | return ret; |
72b2b1dd | 1074 | } |
0559518b | 1075 | return 0; |
3bc3fe5e PM |
1076 | } |
1077 | #endif | |
1078 | ||
d5d1baa1 JE |
1079 | static int get_info(struct net *net, void __user *user, |
1080 | const int *len, int compat) | |
433665c9 | 1081 | { |
12b00c2c | 1082 | char name[XT_TABLE_MAXNAMELEN]; |
433665c9 PM |
1083 | struct xt_table *t; |
1084 | int ret; | |
1085 | ||
1086 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1087 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1088 | sizeof(struct ip6t_getinfo)); |
1089 | return -EINVAL; | |
1090 | } | |
1091 | ||
1092 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1093 | return -EFAULT; | |
1094 | ||
12b00c2c | 1095 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
3bc3fe5e PM |
1096 | #ifdef CONFIG_COMPAT |
1097 | if (compat) | |
1098 | xt_compat_lock(AF_INET6); | |
1099 | #endif | |
336b517f | 1100 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 | 1101 | "ip6table_%s", name); |
0cc8d8df | 1102 | if (!IS_ERR_OR_NULL(t)) { |
433665c9 | 1103 | struct ip6t_getinfo info; |
5452e425 | 1104 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1105 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1106 | struct xt_table_info tmp; |
1107 | ||
3bc3fe5e | 1108 | if (compat) { |
3bc3fe5e PM |
1109 | ret = compat_table_info(private, &tmp); |
1110 | xt_compat_flush_offsets(AF_INET6); | |
1111 | private = &tmp; | |
1112 | } | |
1113 | #endif | |
cccbe5ef | 1114 | memset(&info, 0, sizeof(info)); |
433665c9 PM |
1115 | info.valid_hooks = t->valid_hooks; |
1116 | memcpy(info.hook_entry, private->hook_entry, | |
1117 | sizeof(info.hook_entry)); | |
1118 | memcpy(info.underflow, private->underflow, | |
1119 | sizeof(info.underflow)); | |
1120 | info.num_entries = private->number; | |
1121 | info.size = private->size; | |
b5dd674b | 1122 | strcpy(info.name, name); |
433665c9 PM |
1123 | |
1124 | if (copy_to_user(user, &info, *len) != 0) | |
1125 | ret = -EFAULT; | |
1126 | else | |
1127 | ret = 0; | |
1128 | ||
1129 | xt_table_unlock(t); | |
1130 | module_put(t->me); | |
1131 | } else | |
1132 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1133 | #ifdef CONFIG_COMPAT |
1134 | if (compat) | |
1135 | xt_compat_unlock(AF_INET6); | |
1136 | #endif | |
433665c9 PM |
1137 | return ret; |
1138 | } | |
1139 | ||
1da177e4 | 1140 | static int |
d5d1baa1 JE |
1141 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
1142 | const int *len) | |
1da177e4 LT |
1143 | { |
1144 | int ret; | |
d924357c | 1145 | struct ip6t_get_entries get; |
2e4e6a17 | 1146 | struct xt_table *t; |
1da177e4 | 1147 | |
d924357c | 1148 | if (*len < sizeof(get)) { |
c9d8fe13 | 1149 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1150 | return -EINVAL; |
1151 | } | |
1152 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1153 | return -EFAULT; | |
1154 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1155 | duprintf("get_entries: %u != %zu\n", |
1156 | *len, sizeof(get) + get.size); | |
d924357c PM |
1157 | return -EINVAL; |
1158 | } | |
1159 | ||
336b517f | 1160 | t = xt_find_table_lock(net, AF_INET6, get.name); |
0cc8d8df | 1161 | if (!IS_ERR_OR_NULL(t)) { |
2e4e6a17 HW |
1162 | struct xt_table_info *private = t->private; |
1163 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1164 | if (get.size == private->size) |
2e4e6a17 | 1165 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1166 | t, uptr->entrytable); |
1167 | else { | |
1168 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1169 | private->size, get.size); |
544473c1 | 1170 | ret = -EAGAIN; |
1da177e4 | 1171 | } |
6b7d31fc | 1172 | module_put(t->me); |
2e4e6a17 | 1173 | xt_table_unlock(t); |
1da177e4 | 1174 | } else |
6b7d31fc | 1175 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1176 | |
1177 | return ret; | |
1178 | } | |
1179 | ||
1180 | static int | |
336b517f | 1181 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1182 | struct xt_table_info *newinfo, unsigned int num_counters, |
1183 | void __user *counters_ptr) | |
1da177e4 LT |
1184 | { |
1185 | int ret; | |
2e4e6a17 | 1186 | struct xt_table *t; |
3bc3fe5e | 1187 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1188 | struct xt_counters *counters; |
5452e425 | 1189 | const void *loc_cpu_old_entry; |
72b2b1dd | 1190 | struct ip6t_entry *iter; |
1da177e4 | 1191 | |
3bc3fe5e | 1192 | ret = 0; |
83723d60 | 1193 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
1da177e4 LT |
1194 | if (!counters) { |
1195 | ret = -ENOMEM; | |
3bc3fe5e | 1196 | goto out; |
1da177e4 | 1197 | } |
1da177e4 | 1198 | |
336b517f | 1199 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1200 | "ip6table_%s", name); |
0cc8d8df | 1201 | if (IS_ERR_OR_NULL(t)) { |
6b7d31fc | 1202 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1203 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1204 | } |
1da177e4 LT |
1205 | |
1206 | /* You lied! */ | |
3bc3fe5e | 1207 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1208 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1209 | valid_hooks, t->valid_hooks); |
1da177e4 | 1210 | ret = -EINVAL; |
6b7d31fc | 1211 | goto put_module; |
1da177e4 LT |
1212 | } |
1213 | ||
3bc3fe5e | 1214 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1215 | if (!oldinfo) |
1216 | goto put_module; | |
1217 | ||
1218 | /* Update module usage count based on number of rules */ | |
1219 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1220 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1221 | if ((oldinfo->number > oldinfo->initial_entries) || |
1222 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1223 | module_put(t->me); |
1224 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1225 | (newinfo->number <= oldinfo->initial_entries)) | |
1226 | module_put(t->me); | |
1227 | ||
942e4a2b | 1228 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1229 | get_counters(oldinfo, counters); |
942e4a2b | 1230 | |
1da177e4 | 1231 | /* Decrease module usage counts and free resource */ |
31836064 | 1232 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
72b2b1dd | 1233 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1234 | cleanup_entry(iter, net); |
72b2b1dd | 1235 | |
2e4e6a17 | 1236 | xt_free_table_info(oldinfo); |
3bc3fe5e PM |
1237 | if (copy_to_user(counters_ptr, counters, |
1238 | sizeof(struct xt_counters) * num_counters) != 0) | |
1da177e4 LT |
1239 | ret = -EFAULT; |
1240 | vfree(counters); | |
2e4e6a17 | 1241 | xt_table_unlock(t); |
1da177e4 LT |
1242 | return ret; |
1243 | ||
1244 | put_module: | |
1245 | module_put(t->me); | |
2e4e6a17 | 1246 | xt_table_unlock(t); |
1da177e4 | 1247 | free_newinfo_counters_untrans: |
1da177e4 | 1248 | vfree(counters); |
3bc3fe5e PM |
1249 | out: |
1250 | return ret; | |
1251 | } | |
1252 | ||
1253 | static int | |
d5d1baa1 | 1254 | do_replace(struct net *net, const void __user *user, unsigned int len) |
3bc3fe5e PM |
1255 | { |
1256 | int ret; | |
1257 | struct ip6t_replace tmp; | |
1258 | struct xt_table_info *newinfo; | |
1259 | void *loc_cpu_entry; | |
72b2b1dd | 1260 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1261 | |
1262 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1263 | return -EFAULT; | |
1264 | ||
1265 | /* overflow check */ | |
1266 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1267 | return -ENOMEM; | |
6a8ab060 | 1268 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1269 | |
1270 | newinfo = xt_alloc_table_info(tmp.size); | |
1271 | if (!newinfo) | |
1272 | return -ENOMEM; | |
1273 | ||
1274 | /* choose the copy that is on our node/cpu */ | |
1275 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1276 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1277 | tmp.size) != 0) { | |
1278 | ret = -EFAULT; | |
1279 | goto free_newinfo; | |
1280 | } | |
1281 | ||
0f234214 | 1282 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1283 | if (ret != 0) |
1284 | goto free_newinfo; | |
1285 | ||
1286 | duprintf("ip_tables: Translated table\n"); | |
1287 | ||
336b517f | 1288 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1289 | tmp.num_counters, tmp.counters); |
1290 | if (ret) | |
1291 | goto free_newinfo_untrans; | |
1292 | return 0; | |
1293 | ||
1294 | free_newinfo_untrans: | |
72b2b1dd | 1295 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1296 | cleanup_entry(iter, net); |
1da177e4 | 1297 | free_newinfo: |
2e4e6a17 | 1298 | xt_free_table_info(newinfo); |
1da177e4 LT |
1299 | return ret; |
1300 | } | |
1301 | ||
1da177e4 | 1302 | static int |
d5d1baa1 | 1303 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
336b517f | 1304 | int compat) |
1da177e4 | 1305 | { |
942e4a2b | 1306 | unsigned int i, curcpu; |
3bc3fe5e PM |
1307 | struct xt_counters_info tmp; |
1308 | struct xt_counters *paddc; | |
1309 | unsigned int num_counters; | |
1310 | char *name; | |
1311 | int size; | |
1312 | void *ptmp; | |
2e4e6a17 | 1313 | struct xt_table *t; |
5452e425 | 1314 | const struct xt_table_info *private; |
6b7d31fc | 1315 | int ret = 0; |
5452e425 | 1316 | const void *loc_cpu_entry; |
72b2b1dd | 1317 | struct ip6t_entry *iter; |
7f5c6d4f | 1318 | unsigned int addend; |
3bc3fe5e PM |
1319 | #ifdef CONFIG_COMPAT |
1320 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1321 | |
3bc3fe5e PM |
1322 | if (compat) { |
1323 | ptmp = &compat_tmp; | |
1324 | size = sizeof(struct compat_xt_counters_info); | |
1325 | } else | |
1326 | #endif | |
1327 | { | |
1328 | ptmp = &tmp; | |
1329 | size = sizeof(struct xt_counters_info); | |
1330 | } | |
1331 | ||
1332 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1333 | return -EFAULT; |
1334 | ||
3bc3fe5e PM |
1335 | #ifdef CONFIG_COMPAT |
1336 | if (compat) { | |
1337 | num_counters = compat_tmp.num_counters; | |
1338 | name = compat_tmp.name; | |
1339 | } else | |
1340 | #endif | |
1341 | { | |
1342 | num_counters = tmp.num_counters; | |
1343 | name = tmp.name; | |
1344 | } | |
1345 | ||
1346 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1347 | return -EINVAL; |
1348 | ||
e12f8e29 | 1349 | paddc = vmalloc(len - size); |
1da177e4 LT |
1350 | if (!paddc) |
1351 | return -ENOMEM; | |
1352 | ||
3bc3fe5e | 1353 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1354 | ret = -EFAULT; |
1355 | goto free; | |
1356 | } | |
1357 | ||
336b517f | 1358 | t = xt_find_table_lock(net, AF_INET6, name); |
0cc8d8df | 1359 | if (IS_ERR_OR_NULL(t)) { |
6b7d31fc | 1360 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1361 | goto free; |
6b7d31fc | 1362 | } |
1da177e4 | 1363 | |
942e4a2b SH |
1364 | |
1365 | local_bh_disable(); | |
2e4e6a17 | 1366 | private = t->private; |
3bc3fe5e | 1367 | if (private->number != num_counters) { |
1da177e4 LT |
1368 | ret = -EINVAL; |
1369 | goto unlock_up_free; | |
1370 | } | |
1371 | ||
1372 | i = 0; | |
31836064 | 1373 | /* Choose the copy that is on our node */ |
942e4a2b | 1374 | curcpu = smp_processor_id(); |
7f5c6d4f | 1375 | addend = xt_write_recseq_begin(); |
942e4a2b | 1376 | loc_cpu_entry = private->entries[curcpu]; |
0559518b JE |
1377 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1378 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1379 | ++i; | |
1380 | } | |
7f5c6d4f | 1381 | xt_write_recseq_end(addend); |
942e4a2b | 1382 | |
1da177e4 | 1383 | unlock_up_free: |
942e4a2b | 1384 | local_bh_enable(); |
2e4e6a17 | 1385 | xt_table_unlock(t); |
6b7d31fc | 1386 | module_put(t->me); |
1da177e4 LT |
1387 | free: |
1388 | vfree(paddc); | |
1389 | ||
1390 | return ret; | |
1391 | } | |
1392 | ||
3bc3fe5e PM |
1393 | #ifdef CONFIG_COMPAT |
1394 | struct compat_ip6t_replace { | |
12b00c2c | 1395 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1396 | u32 valid_hooks; |
1397 | u32 num_entries; | |
1398 | u32 size; | |
1399 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1400 | u32 underflow[NF_INET_NUMHOOKS]; | |
1401 | u32 num_counters; | |
87a2e70d | 1402 | compat_uptr_t counters; /* struct xt_counters * */ |
3bc3fe5e PM |
1403 | struct compat_ip6t_entry entries[0]; |
1404 | }; | |
1405 | ||
1406 | static int | |
1407 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1408 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1409 | unsigned int i) |
3bc3fe5e | 1410 | { |
87a2e70d | 1411 | struct xt_entry_target *t; |
3bc3fe5e PM |
1412 | struct compat_ip6t_entry __user *ce; |
1413 | u_int16_t target_offset, next_offset; | |
1414 | compat_uint_t origsize; | |
dcea992a JE |
1415 | const struct xt_entry_match *ematch; |
1416 | int ret = 0; | |
3bc3fe5e | 1417 | |
3bc3fe5e PM |
1418 | origsize = *size; |
1419 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
0559518b JE |
1420 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1421 | copy_to_user(&ce->counters, &counters[i], | |
1422 | sizeof(counters[i])) != 0) | |
1423 | return -EFAULT; | |
3bc3fe5e PM |
1424 | |
1425 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1426 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1427 | ||
dcea992a JE |
1428 | xt_ematch_foreach(ematch, e) { |
1429 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1430 | if (ret != 0) | |
6bdb331b | 1431 | return ret; |
dcea992a | 1432 | } |
3bc3fe5e | 1433 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1434 | t = ip6t_get_target(e); |
1435 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1436 | if (ret) | |
0559518b | 1437 | return ret; |
3bc3fe5e | 1438 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1439 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1440 | put_user(next_offset, &ce->next_offset) != 0) | |
1441 | return -EFAULT; | |
3bc3fe5e | 1442 | return 0; |
3bc3fe5e PM |
1443 | } |
1444 | ||
022748a9 | 1445 | static int |
87a2e70d | 1446 | compat_find_calc_match(struct xt_entry_match *m, |
3bc3fe5e PM |
1447 | const char *name, |
1448 | const struct ip6t_ip6 *ipv6, | |
1449 | unsigned int hookmask, | |
6bdb331b | 1450 | int *size) |
3bc3fe5e PM |
1451 | { |
1452 | struct xt_match *match; | |
1453 | ||
fd0ec0e6 JE |
1454 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
1455 | m->u.user.revision); | |
1456 | if (IS_ERR(match)) { | |
3bc3fe5e PM |
1457 | duprintf("compat_check_calc_match: `%s' not found\n", |
1458 | m->u.user.name); | |
fd0ec0e6 | 1459 | return PTR_ERR(match); |
3bc3fe5e PM |
1460 | } |
1461 | m->u.kernel.match = match; | |
1462 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1463 | return 0; |
1464 | } | |
1465 | ||
0559518b | 1466 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e | 1467 | { |
87a2e70d | 1468 | struct xt_entry_target *t; |
dcea992a | 1469 | struct xt_entry_match *ematch; |
3bc3fe5e | 1470 | |
3bc3fe5e | 1471 | /* Cleanup all matches */ |
dcea992a | 1472 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1473 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1474 | t = compat_ip6t_get_target(e); |
1475 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1476 | } |
1477 | ||
022748a9 | 1478 | static int |
3bc3fe5e PM |
1479 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1480 | struct xt_table_info *newinfo, | |
1481 | unsigned int *size, | |
d5d1baa1 JE |
1482 | const unsigned char *base, |
1483 | const unsigned char *limit, | |
1484 | const unsigned int *hook_entries, | |
1485 | const unsigned int *underflows, | |
3bc3fe5e PM |
1486 | const char *name) |
1487 | { | |
dcea992a | 1488 | struct xt_entry_match *ematch; |
87a2e70d | 1489 | struct xt_entry_target *t; |
3bc3fe5e PM |
1490 | struct xt_target *target; |
1491 | unsigned int entry_offset; | |
b0a6363c PM |
1492 | unsigned int j; |
1493 | int ret, off, h; | |
3bc3fe5e PM |
1494 | |
1495 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1496 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
1497 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
3bc3fe5e PM |
1498 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1499 | return -EINVAL; | |
1500 | } | |
1501 | ||
1502 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1503 | sizeof(struct compat_xt_entry_target)) { | |
1504 | duprintf("checking: element %p size %u\n", | |
1505 | e, e->next_offset); | |
1506 | return -EINVAL; | |
1507 | } | |
1508 | ||
1509 | /* For purposes of check_entry casting the compat entry is fine */ | |
1510 | ret = check_entry((struct ip6t_entry *)e, name); | |
1511 | if (ret) | |
1512 | return ret; | |
1513 | ||
1514 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1515 | entry_offset = (void *)e - (void *)base; | |
1516 | j = 0; | |
dcea992a JE |
1517 | xt_ematch_foreach(ematch, e) { |
1518 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1519 | &e->ipv6, e->comefrom, &off); |
dcea992a | 1520 | if (ret != 0) |
6bdb331b JE |
1521 | goto release_matches; |
1522 | ++j; | |
dcea992a | 1523 | } |
3bc3fe5e PM |
1524 | |
1525 | t = compat_ip6t_get_target(e); | |
d2a7b6ba JE |
1526 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
1527 | t->u.user.revision); | |
1528 | if (IS_ERR(target)) { | |
3bc3fe5e PM |
1529 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
1530 | t->u.user.name); | |
d2a7b6ba | 1531 | ret = PTR_ERR(target); |
3bc3fe5e PM |
1532 | goto release_matches; |
1533 | } | |
1534 | t->u.kernel.target = target; | |
1535 | ||
1536 | off += xt_compat_target_offset(target); | |
1537 | *size += off; | |
1538 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1539 | if (ret) | |
1540 | goto out; | |
1541 | ||
1542 | /* Check hooks & underflows */ | |
1543 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1544 | if ((unsigned char *)e - base == hook_entries[h]) | |
1545 | newinfo->hook_entry[h] = hook_entries[h]; | |
1546 | if ((unsigned char *)e - base == underflows[h]) | |
1547 | newinfo->underflow[h] = underflows[h]; | |
1548 | } | |
1549 | ||
1550 | /* Clear counters and comefrom */ | |
1551 | memset(&e->counters, 0, sizeof(e->counters)); | |
1552 | e->comefrom = 0; | |
3bc3fe5e PM |
1553 | return 0; |
1554 | ||
1555 | out: | |
1556 | module_put(t->u.kernel.target->me); | |
1557 | release_matches: | |
6bdb331b JE |
1558 | xt_ematch_foreach(ematch, e) { |
1559 | if (j-- == 0) | |
dcea992a | 1560 | break; |
6bdb331b JE |
1561 | module_put(ematch->u.kernel.match->me); |
1562 | } | |
3bc3fe5e PM |
1563 | return ret; |
1564 | } | |
1565 | ||
1566 | static int | |
1567 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1568 | unsigned int *size, const char *name, | |
1569 | struct xt_table_info *newinfo, unsigned char *base) | |
1570 | { | |
87a2e70d | 1571 | struct xt_entry_target *t; |
3bc3fe5e PM |
1572 | struct ip6t_entry *de; |
1573 | unsigned int origsize; | |
1574 | int ret, h; | |
dcea992a | 1575 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1576 | |
1577 | ret = 0; | |
1578 | origsize = *size; | |
1579 | de = (struct ip6t_entry *)*dstptr; | |
1580 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1581 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1582 | ||
1583 | *dstptr += sizeof(struct ip6t_entry); | |
1584 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1585 | ||
dcea992a JE |
1586 | xt_ematch_foreach(ematch, e) { |
1587 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1588 | if (ret != 0) | |
6bdb331b | 1589 | return ret; |
dcea992a | 1590 | } |
3bc3fe5e PM |
1591 | de->target_offset = e->target_offset - (origsize - *size); |
1592 | t = compat_ip6t_get_target(e); | |
3bc3fe5e PM |
1593 | xt_compat_target_from_user(t, dstptr, size); |
1594 | ||
1595 | de->next_offset = e->next_offset - (origsize - *size); | |
1596 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1597 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1598 | newinfo->hook_entry[h] -= origsize - *size; | |
1599 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1600 | newinfo->underflow[h] -= origsize - *size; | |
1601 | } | |
1602 | return ret; | |
1603 | } | |
1604 | ||
f54e9367 | 1605 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
0559518b | 1606 | const char *name) |
3bc3fe5e | 1607 | { |
b0a6363c | 1608 | unsigned int j; |
dcea992a | 1609 | int ret = 0; |
9b4fce7a | 1610 | struct xt_mtchk_param mtpar; |
dcea992a | 1611 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1612 | |
1613 | j = 0; | |
f54e9367 | 1614 | mtpar.net = net; |
9b4fce7a JE |
1615 | mtpar.table = name; |
1616 | mtpar.entryinfo = &e->ipv6; | |
1617 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1618 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 1619 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1620 | ret = check_match(ematch, &mtpar); |
dcea992a | 1621 | if (ret != 0) |
6bdb331b JE |
1622 | goto cleanup_matches; |
1623 | ++j; | |
dcea992a | 1624 | } |
3bc3fe5e | 1625 | |
add67461 | 1626 | ret = check_target(e, net, name); |
3bc3fe5e PM |
1627 | if (ret) |
1628 | goto cleanup_matches; | |
3bc3fe5e PM |
1629 | return 0; |
1630 | ||
1631 | cleanup_matches: | |
6bdb331b JE |
1632 | xt_ematch_foreach(ematch, e) { |
1633 | if (j-- == 0) | |
dcea992a | 1634 | break; |
6bdb331b JE |
1635 | cleanup_match(ematch, net); |
1636 | } | |
3bc3fe5e PM |
1637 | return ret; |
1638 | } | |
1639 | ||
1640 | static int | |
f54e9367 AD |
1641 | translate_compat_table(struct net *net, |
1642 | const char *name, | |
3bc3fe5e PM |
1643 | unsigned int valid_hooks, |
1644 | struct xt_table_info **pinfo, | |
1645 | void **pentry0, | |
1646 | unsigned int total_size, | |
1647 | unsigned int number, | |
1648 | unsigned int *hook_entries, | |
1649 | unsigned int *underflows) | |
1650 | { | |
1651 | unsigned int i, j; | |
1652 | struct xt_table_info *newinfo, *info; | |
1653 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1654 | struct compat_ip6t_entry *iter0; |
1655 | struct ip6t_entry *iter1; | |
3bc3fe5e | 1656 | unsigned int size; |
72b2b1dd | 1657 | int ret = 0; |
3bc3fe5e PM |
1658 | |
1659 | info = *pinfo; | |
1660 | entry0 = *pentry0; | |
1661 | size = total_size; | |
1662 | info->number = number; | |
1663 | ||
1664 | /* Init all hooks to impossible value. */ | |
1665 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1666 | info->hook_entry[i] = 0xFFFFFFFF; | |
1667 | info->underflow[i] = 0xFFFFFFFF; | |
1668 | } | |
1669 | ||
1670 | duprintf("translate_compat_table: size %u\n", info->size); | |
1671 | j = 0; | |
1672 | xt_compat_lock(AF_INET6); | |
255d0dc3 | 1673 | xt_compat_init_offsets(AF_INET6, number); |
3bc3fe5e | 1674 | /* Walk through entries, checking offsets. */ |
72b2b1dd JE |
1675 | xt_entry_foreach(iter0, entry0, total_size) { |
1676 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1677 | entry0, |
1678 | entry0 + total_size, | |
1679 | hook_entries, | |
1680 | underflows, | |
1681 | name); | |
72b2b1dd | 1682 | if (ret != 0) |
0559518b JE |
1683 | goto out_unlock; |
1684 | ++j; | |
72b2b1dd | 1685 | } |
3bc3fe5e PM |
1686 | |
1687 | ret = -EINVAL; | |
1688 | if (j != number) { | |
1689 | duprintf("translate_compat_table: %u not %u entries\n", | |
1690 | j, number); | |
1691 | goto out_unlock; | |
1692 | } | |
1693 | ||
1694 | /* Check hooks all assigned */ | |
1695 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1696 | /* Only hooks which are valid */ | |
1697 | if (!(valid_hooks & (1 << i))) | |
1698 | continue; | |
1699 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1700 | duprintf("Invalid hook entry %u %u\n", | |
1701 | i, hook_entries[i]); | |
1702 | goto out_unlock; | |
1703 | } | |
1704 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1705 | duprintf("Invalid underflow %u %u\n", | |
1706 | i, underflows[i]); | |
1707 | goto out_unlock; | |
1708 | } | |
1709 | } | |
1710 | ||
1711 | ret = -ENOMEM; | |
1712 | newinfo = xt_alloc_table_info(size); | |
1713 | if (!newinfo) | |
1714 | goto out_unlock; | |
1715 | ||
1716 | newinfo->number = number; | |
1717 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1718 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1719 | newinfo->underflow[i] = info->underflow[i]; | |
1720 | } | |
1721 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1722 | pos = entry1; | |
1723 | size = total_size; | |
72b2b1dd | 1724 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1725 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1726 | name, newinfo, entry1); | |
72b2b1dd JE |
1727 | if (ret != 0) |
1728 | break; | |
1729 | } | |
3bc3fe5e PM |
1730 | xt_compat_flush_offsets(AF_INET6); |
1731 | xt_compat_unlock(AF_INET6); | |
1732 | if (ret) | |
1733 | goto free_newinfo; | |
1734 | ||
1735 | ret = -ELOOP; | |
1736 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1737 | goto free_newinfo; | |
1738 | ||
1739 | i = 0; | |
72b2b1dd | 1740 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1741 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1742 | if (ret != 0) |
1743 | break; | |
0559518b | 1744 | ++i; |
cca77b7c FW |
1745 | if (strcmp(ip6t_get_target(iter1)->u.user.name, |
1746 | XT_ERROR_TARGET) == 0) | |
1747 | ++newinfo->stacksize; | |
72b2b1dd | 1748 | } |
3bc3fe5e | 1749 | if (ret) { |
72b2b1dd JE |
1750 | /* |
1751 | * The first i matches need cleanup_entry (calls ->destroy) | |
1752 | * because they had called ->check already. The other j-i | |
1753 | * entries need only release. | |
1754 | */ | |
1755 | int skip = i; | |
3bc3fe5e | 1756 | j -= i; |
72b2b1dd JE |
1757 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1758 | if (skip-- > 0) | |
1759 | continue; | |
0559518b | 1760 | if (j-- == 0) |
72b2b1dd | 1761 | break; |
0559518b | 1762 | compat_release_entry(iter0); |
72b2b1dd | 1763 | } |
0559518b JE |
1764 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1765 | if (i-- == 0) | |
72b2b1dd | 1766 | break; |
0559518b JE |
1767 | cleanup_entry(iter1, net); |
1768 | } | |
3bc3fe5e PM |
1769 | xt_free_table_info(newinfo); |
1770 | return ret; | |
1771 | } | |
1772 | ||
1773 | /* And one copy for every other CPU */ | |
1774 | for_each_possible_cpu(i) | |
1775 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1776 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1777 | ||
1778 | *pinfo = newinfo; | |
1779 | *pentry0 = entry1; | |
1780 | xt_free_table_info(info); | |
1781 | return 0; | |
1782 | ||
1783 | free_newinfo: | |
1784 | xt_free_table_info(newinfo); | |
1785 | out: | |
0559518b JE |
1786 | xt_entry_foreach(iter0, entry0, total_size) { |
1787 | if (j-- == 0) | |
72b2b1dd | 1788 | break; |
0559518b JE |
1789 | compat_release_entry(iter0); |
1790 | } | |
3bc3fe5e PM |
1791 | return ret; |
1792 | out_unlock: | |
1793 | xt_compat_flush_offsets(AF_INET6); | |
1794 | xt_compat_unlock(AF_INET6); | |
1795 | goto out; | |
1796 | } | |
1797 | ||
1798 | static int | |
336b517f | 1799 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1800 | { |
1801 | int ret; | |
1802 | struct compat_ip6t_replace tmp; | |
1803 | struct xt_table_info *newinfo; | |
1804 | void *loc_cpu_entry; | |
72b2b1dd | 1805 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1806 | |
1807 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1808 | return -EFAULT; | |
1809 | ||
1810 | /* overflow check */ | |
1811 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1812 | return -ENOMEM; | |
1813 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1814 | return -ENOMEM; | |
6a8ab060 | 1815 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1816 | |
1817 | newinfo = xt_alloc_table_info(tmp.size); | |
1818 | if (!newinfo) | |
1819 | return -ENOMEM; | |
1820 | ||
9c547959 | 1821 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1822 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1823 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1824 | tmp.size) != 0) { | |
1825 | ret = -EFAULT; | |
1826 | goto free_newinfo; | |
1827 | } | |
1828 | ||
f54e9367 | 1829 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1830 | &newinfo, &loc_cpu_entry, tmp.size, |
1831 | tmp.num_entries, tmp.hook_entry, | |
1832 | tmp.underflow); | |
1833 | if (ret != 0) | |
1834 | goto free_newinfo; | |
1835 | ||
1836 | duprintf("compat_do_replace: Translated table\n"); | |
1837 | ||
336b517f | 1838 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1839 | tmp.num_counters, compat_ptr(tmp.counters)); |
1840 | if (ret) | |
1841 | goto free_newinfo_untrans; | |
1842 | return 0; | |
1843 | ||
1844 | free_newinfo_untrans: | |
72b2b1dd | 1845 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1846 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1847 | free_newinfo: |
1848 | xt_free_table_info(newinfo); | |
1849 | return ret; | |
1850 | } | |
1851 | ||
1852 | static int | |
1853 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1854 | unsigned int len) | |
1855 | { | |
1856 | int ret; | |
1857 | ||
af31f412 | 1858 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1859 | return -EPERM; |
1860 | ||
1861 | switch (cmd) { | |
1862 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1863 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1864 | break; |
1865 | ||
1866 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1867 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1868 | break; |
1869 | ||
1870 | default: | |
1871 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1872 | ret = -EINVAL; | |
1873 | } | |
1874 | ||
1875 | return ret; | |
1876 | } | |
1877 | ||
1878 | struct compat_ip6t_get_entries { | |
12b00c2c | 1879 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1880 | compat_uint_t size; |
1881 | struct compat_ip6t_entry entrytable[0]; | |
1882 | }; | |
1883 | ||
1884 | static int | |
1885 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1886 | void __user *userptr) | |
1887 | { | |
1888 | struct xt_counters *counters; | |
5452e425 | 1889 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1890 | void __user *pos; |
1891 | unsigned int size; | |
1892 | int ret = 0; | |
5452e425 | 1893 | const void *loc_cpu_entry; |
3bc3fe5e | 1894 | unsigned int i = 0; |
72b2b1dd | 1895 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1896 | |
1897 | counters = alloc_counters(table); | |
1898 | if (IS_ERR(counters)) | |
1899 | return PTR_ERR(counters); | |
1900 | ||
1901 | /* choose the copy that is on our node/cpu, ... | |
1902 | * This choice is lazy (because current thread is | |
1903 | * allowed to migrate to another cpu) | |
1904 | */ | |
1905 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1906 | pos = userptr; | |
1907 | size = total_size; | |
72b2b1dd JE |
1908 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1909 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1910 | &size, counters, i++); |
72b2b1dd JE |
1911 | if (ret != 0) |
1912 | break; | |
1913 | } | |
3bc3fe5e PM |
1914 | |
1915 | vfree(counters); | |
1916 | return ret; | |
1917 | } | |
1918 | ||
1919 | static int | |
336b517f AD |
1920 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1921 | int *len) | |
3bc3fe5e PM |
1922 | { |
1923 | int ret; | |
1924 | struct compat_ip6t_get_entries get; | |
1925 | struct xt_table *t; | |
1926 | ||
1927 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1928 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1929 | return -EINVAL; |
1930 | } | |
1931 | ||
1932 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1933 | return -EFAULT; | |
1934 | ||
1935 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1936 | duprintf("compat_get_entries: %u != %zu\n", |
1937 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1938 | return -EINVAL; |
1939 | } | |
1940 | ||
1941 | xt_compat_lock(AF_INET6); | |
336b517f | 1942 | t = xt_find_table_lock(net, AF_INET6, get.name); |
0cc8d8df | 1943 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1944 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1945 | struct xt_table_info info; |
9c547959 | 1946 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1947 | ret = compat_table_info(private, &info); |
1948 | if (!ret && get.size == info.size) { | |
1949 | ret = compat_copy_entries_to_user(private->size, | |
1950 | t, uptr->entrytable); | |
1951 | } else if (!ret) { | |
1952 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1953 | private->size, get.size); |
544473c1 | 1954 | ret = -EAGAIN; |
3bc3fe5e PM |
1955 | } |
1956 | xt_compat_flush_offsets(AF_INET6); | |
1957 | module_put(t->me); | |
1958 | xt_table_unlock(t); | |
1959 | } else | |
1960 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1961 | ||
1962 | xt_compat_unlock(AF_INET6); | |
1963 | return ret; | |
1964 | } | |
1965 | ||
1966 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
1967 | ||
1968 | static int | |
1969 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1970 | { | |
1971 | int ret; | |
1972 | ||
af31f412 | 1973 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1974 | return -EPERM; |
1975 | ||
1976 | switch (cmd) { | |
1977 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 1978 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1979 | break; |
1980 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 1981 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
1982 | break; |
1983 | default: | |
1984 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
1985 | } | |
1986 | return ret; | |
1987 | } | |
1988 | #endif | |
1989 | ||
1da177e4 LT |
1990 | static int |
1991 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
1992 | { | |
1993 | int ret; | |
1994 | ||
af31f412 | 1995 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1996 | return -EPERM; |
1997 | ||
1998 | switch (cmd) { | |
1999 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2000 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2001 | break; |
2002 | ||
2003 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2004 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2005 | break; |
2006 | ||
2007 | default: | |
2008 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2009 | ret = -EINVAL; | |
2010 | } | |
2011 | ||
2012 | return ret; | |
2013 | } | |
2014 | ||
2015 | static int | |
2016 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2017 | { | |
2018 | int ret; | |
2019 | ||
af31f412 | 2020 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2021 | return -EPERM; |
2022 | ||
2023 | switch (cmd) { | |
433665c9 | 2024 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2025 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2026 | break; |
1da177e4 | 2027 | |
d924357c | 2028 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2029 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2030 | break; |
1da177e4 | 2031 | |
6b7d31fc HW |
2032 | case IP6T_SO_GET_REVISION_MATCH: |
2033 | case IP6T_SO_GET_REVISION_TARGET: { | |
12b00c2c | 2034 | struct xt_get_revision rev; |
2e4e6a17 | 2035 | int target; |
6b7d31fc HW |
2036 | |
2037 | if (*len != sizeof(rev)) { | |
2038 | ret = -EINVAL; | |
2039 | break; | |
2040 | } | |
2041 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2042 | ret = -EFAULT; | |
2043 | break; | |
2044 | } | |
6a8ab060 | 2045 | rev.name[sizeof(rev.name)-1] = 0; |
6b7d31fc HW |
2046 | |
2047 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2048 | target = 1; |
6b7d31fc | 2049 | else |
2e4e6a17 | 2050 | target = 0; |
6b7d31fc | 2051 | |
2e4e6a17 HW |
2052 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2053 | rev.revision, | |
2054 | target, &ret), | |
6b7d31fc HW |
2055 | "ip6t_%s", rev.name); |
2056 | break; | |
2057 | } | |
2058 | ||
1da177e4 LT |
2059 | default: |
2060 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2061 | ret = -EINVAL; | |
2062 | } | |
2063 | ||
2064 | return ret; | |
2065 | } | |
2066 | ||
35aad0ff JE |
2067 | struct xt_table *ip6t_register_table(struct net *net, |
2068 | const struct xt_table *table, | |
336b517f | 2069 | const struct ip6t_replace *repl) |
1da177e4 LT |
2070 | { |
2071 | int ret; | |
2e4e6a17 | 2072 | struct xt_table_info *newinfo; |
f3c5c1bf | 2073 | struct xt_table_info bootstrap = {0}; |
31836064 | 2074 | void *loc_cpu_entry; |
a98da11d | 2075 | struct xt_table *new_table; |
1da177e4 | 2076 | |
2e4e6a17 | 2077 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2078 | if (!newinfo) { |
2079 | ret = -ENOMEM; | |
2080 | goto out; | |
2081 | } | |
1da177e4 | 2082 | |
9c547959 | 2083 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2084 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2085 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2086 | |
0f234214 | 2087 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2088 | if (ret != 0) |
2089 | goto out_free; | |
1da177e4 | 2090 | |
336b517f | 2091 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2092 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2093 | ret = PTR_ERR(new_table); |
2094 | goto out_free; | |
1da177e4 | 2095 | } |
44d34e72 | 2096 | return new_table; |
1da177e4 | 2097 | |
44d34e72 AD |
2098 | out_free: |
2099 | xt_free_table_info(newinfo); | |
2100 | out: | |
2101 | return ERR_PTR(ret); | |
1da177e4 LT |
2102 | } |
2103 | ||
f54e9367 | 2104 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2105 | { |
2e4e6a17 | 2106 | struct xt_table_info *private; |
31836064 | 2107 | void *loc_cpu_entry; |
df200969 | 2108 | struct module *table_owner = table->me; |
72b2b1dd | 2109 | struct ip6t_entry *iter; |
31836064 | 2110 | |
2e4e6a17 | 2111 | private = xt_unregister_table(table); |
1da177e4 LT |
2112 | |
2113 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2114 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2115 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2116 | cleanup_entry(iter, net); |
df200969 AD |
2117 | if (private->number > private->initial_entries) |
2118 | module_put(table_owner); | |
2e4e6a17 | 2119 | xt_free_table_info(private); |
1da177e4 LT |
2120 | } |
2121 | ||
2122 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2123 | static inline bool |
1da177e4 LT |
2124 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2125 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2126 | bool invert) |
1da177e4 LT |
2127 | { |
2128 | return (type == test_type && code >= min_code && code <= max_code) | |
2129 | ^ invert; | |
2130 | } | |
2131 | ||
1d93a9cb | 2132 | static bool |
62fc8051 | 2133 | icmp6_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2134 | { |
5452e425 JE |
2135 | const struct icmp6hdr *ic; |
2136 | struct icmp6hdr _icmph; | |
f7108a20 | 2137 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2138 | |
2139 | /* Must not be a fragment. */ | |
f7108a20 | 2140 | if (par->fragoff != 0) |
1d93a9cb | 2141 | return false; |
1da177e4 | 2142 | |
f7108a20 | 2143 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2144 | if (ic == NULL) { |
2145 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2146 | * can't. Hence, no choice but to drop. |
2147 | */ | |
1da177e4 | 2148 | duprintf("Dropping evil ICMP tinygram.\n"); |
b4ba2611 | 2149 | par->hotdrop = true; |
1d93a9cb | 2150 | return false; |
1da177e4 LT |
2151 | } |
2152 | ||
2153 | return icmp6_type_code_match(icmpinfo->type, | |
2154 | icmpinfo->code[0], | |
2155 | icmpinfo->code[1], | |
2156 | ic->icmp6_type, ic->icmp6_code, | |
2157 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2158 | } | |
2159 | ||
2160 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 2161 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2162 | { |
9b4fce7a | 2163 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2164 | |
7f939713 | 2165 | /* Must specify no unknown invflags */ |
bd414ee6 | 2166 | return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2167 | } |
2168 | ||
2169 | /* The built-in targets: standard (NULL) and error. */ | |
4538506b JE |
2170 | static struct xt_target ip6t_builtin_tg[] __read_mostly = { |
2171 | { | |
243bf6e2 | 2172 | .name = XT_STANDARD_TARGET, |
4538506b JE |
2173 | .targetsize = sizeof(int), |
2174 | .family = NFPROTO_IPV6, | |
3bc3fe5e | 2175 | #ifdef CONFIG_COMPAT |
4538506b JE |
2176 | .compatsize = sizeof(compat_int_t), |
2177 | .compat_from_user = compat_standard_from_user, | |
2178 | .compat_to_user = compat_standard_to_user, | |
3bc3fe5e | 2179 | #endif |
4538506b JE |
2180 | }, |
2181 | { | |
243bf6e2 | 2182 | .name = XT_ERROR_TARGET, |
4538506b | 2183 | .target = ip6t_error, |
12b00c2c | 2184 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
2185 | .family = NFPROTO_IPV6, |
2186 | }, | |
1da177e4 LT |
2187 | }; |
2188 | ||
2189 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2190 | .pf = PF_INET6, | |
2191 | .set_optmin = IP6T_BASE_CTL, | |
2192 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2193 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2194 | #ifdef CONFIG_COMPAT |
2195 | .compat_set = compat_do_ip6t_set_ctl, | |
2196 | #endif | |
1da177e4 LT |
2197 | .get_optmin = IP6T_BASE_CTL, |
2198 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2199 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2200 | #ifdef CONFIG_COMPAT |
2201 | .compat_get = compat_do_ip6t_get_ctl, | |
2202 | #endif | |
16fcec35 | 2203 | .owner = THIS_MODULE, |
1da177e4 LT |
2204 | }; |
2205 | ||
4538506b JE |
2206 | static struct xt_match ip6t_builtin_mt[] __read_mostly = { |
2207 | { | |
2208 | .name = "icmp6", | |
2209 | .match = icmp6_match, | |
2210 | .matchsize = sizeof(struct ip6t_icmp), | |
2211 | .checkentry = icmp6_checkentry, | |
2212 | .proto = IPPROTO_ICMPV6, | |
2213 | .family = NFPROTO_IPV6, | |
2214 | }, | |
1da177e4 LT |
2215 | }; |
2216 | ||
3cb609d5 AD |
2217 | static int __net_init ip6_tables_net_init(struct net *net) |
2218 | { | |
383ca5b8 | 2219 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2220 | } |
2221 | ||
2222 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2223 | { | |
383ca5b8 | 2224 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2225 | } |
2226 | ||
2227 | static struct pernet_operations ip6_tables_net_ops = { | |
2228 | .init = ip6_tables_net_init, | |
2229 | .exit = ip6_tables_net_exit, | |
2230 | }; | |
2231 | ||
65b4b4e8 | 2232 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2233 | { |
2234 | int ret; | |
2235 | ||
3cb609d5 | 2236 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2237 | if (ret < 0) |
2238 | goto err1; | |
2e4e6a17 | 2239 | |
25985edc | 2240 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 2241 | ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 PM |
2242 | if (ret < 0) |
2243 | goto err2; | |
4538506b | 2244 | ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 PM |
2245 | if (ret < 0) |
2246 | goto err4; | |
1da177e4 LT |
2247 | |
2248 | /* Register setsockopt */ | |
2249 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2250 | if (ret < 0) |
2251 | goto err5; | |
1da177e4 | 2252 | |
ff67e4e4 | 2253 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2254 | return 0; |
0eff66e6 PM |
2255 | |
2256 | err5: | |
4538506b | 2257 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 | 2258 | err4: |
4538506b | 2259 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 | 2260 | err2: |
3cb609d5 | 2261 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2262 | err1: |
2263 | return ret; | |
1da177e4 LT |
2264 | } |
2265 | ||
65b4b4e8 | 2266 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2267 | { |
2268 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2269 | |
4538506b JE |
2270 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
2271 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); | |
3cb609d5 | 2272 | unregister_pernet_subsys(&ip6_tables_net_ops); |
1da177e4 LT |
2273 | } |
2274 | ||
2275 | EXPORT_SYMBOL(ip6t_register_table); | |
2276 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2277 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2278 | |
65b4b4e8 AM |
2279 | module_init(ip6_tables_init); |
2280 | module_exit(ip6_tables_fini); |