]>
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> |
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 | /* Check for an extension */ |
1ab1457c | 82 | int |
1da177e4 LT |
83 | ip6t_ext_hdr(u8 nexthdr) |
84 | { | |
a02cec21 ED |
85 | return (nexthdr == IPPROTO_HOPOPTS) || |
86 | (nexthdr == IPPROTO_ROUTING) || | |
87 | (nexthdr == IPPROTO_FRAGMENT) || | |
88 | (nexthdr == IPPROTO_ESP) || | |
89 | (nexthdr == IPPROTO_AH) || | |
90 | (nexthdr == IPPROTO_NONE) || | |
91 | (nexthdr == IPPROTO_DSTOPTS); | |
1da177e4 LT |
92 | } |
93 | ||
94 | /* Returns whether matches rule or not. */ | |
022748a9 | 95 | /* Performance critical - called for every packet */ |
1d93a9cb | 96 | static inline bool |
1da177e4 LT |
97 | ip6_packet_match(const struct sk_buff *skb, |
98 | const char *indev, | |
99 | const char *outdev, | |
100 | const struct ip6t_ip6 *ip6info, | |
101 | unsigned int *protoff, | |
cff533ac | 102 | int *fragoff, bool *hotdrop) |
1da177e4 | 103 | { |
1da177e4 | 104 | unsigned long ret; |
0660e03f | 105 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
1da177e4 | 106 | |
e79ec50b | 107 | #define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg))) |
1da177e4 | 108 | |
f2ffd9ee | 109 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
3666ed1c JP |
110 | &ip6info->src), IP6T_INV_SRCIP) || |
111 | FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, | |
112 | &ip6info->dst), IP6T_INV_DSTIP)) { | |
1da177e4 LT |
113 | dprintf("Source or dest mismatch.\n"); |
114 | /* | |
115 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, | |
116 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, | |
117 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); | |
118 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, | |
119 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, | |
120 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ | |
1d93a9cb | 121 | return false; |
1da177e4 LT |
122 | } |
123 | ||
b8dfe498 | 124 | ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask); |
1da177e4 LT |
125 | |
126 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { | |
127 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
128 | indev, ip6info->iniface, | |
129 | ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":""); | |
1d93a9cb | 130 | return false; |
1da177e4 LT |
131 | } |
132 | ||
b8dfe498 | 133 | ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask); |
1da177e4 LT |
134 | |
135 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { | |
136 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
137 | outdev, ip6info->outiface, | |
138 | ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":""); | |
1d93a9cb | 139 | return false; |
1da177e4 LT |
140 | } |
141 | ||
142 | /* ... might want to do something with class and flowlabel here ... */ | |
143 | ||
144 | /* look for the desired protocol header */ | |
145 | if((ip6info->flags & IP6T_F_PROTO)) { | |
b777e0ce PM |
146 | int protohdr; |
147 | unsigned short _frag_off; | |
1da177e4 | 148 | |
b777e0ce | 149 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off); |
51d8b1a6 PM |
150 | if (protohdr < 0) { |
151 | if (_frag_off == 0) | |
cff533ac | 152 | *hotdrop = true; |
1d93a9cb | 153 | return false; |
51d8b1a6 | 154 | } |
b777e0ce | 155 | *fragoff = _frag_off; |
1da177e4 LT |
156 | |
157 | dprintf("Packet protocol %hi ?= %s%hi.\n", | |
1ab1457c | 158 | protohdr, |
1da177e4 LT |
159 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
160 | ip6info->proto); | |
161 | ||
b777e0ce | 162 | if (ip6info->proto == protohdr) { |
1da177e4 | 163 | if(ip6info->invflags & IP6T_INV_PROTO) { |
1d93a9cb | 164 | return false; |
1da177e4 | 165 | } |
1d93a9cb | 166 | return true; |
1da177e4 LT |
167 | } |
168 | ||
169 | /* We need match for the '-p all', too! */ | |
170 | if ((ip6info->proto != 0) && | |
171 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
1d93a9cb | 172 | return false; |
1da177e4 | 173 | } |
1d93a9cb | 174 | return true; |
1da177e4 LT |
175 | } |
176 | ||
177 | /* should be ip6 safe */ | |
022748a9 | 178 | static bool |
1da177e4 LT |
179 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
180 | { | |
181 | if (ipv6->flags & ~IP6T_F_MASK) { | |
182 | duprintf("Unknown flag bits set: %08X\n", | |
183 | ipv6->flags & ~IP6T_F_MASK); | |
ccb79bdc | 184 | return false; |
1da177e4 LT |
185 | } |
186 | if (ipv6->invflags & ~IP6T_INV_MASK) { | |
187 | duprintf("Unknown invflag bits set: %08X\n", | |
188 | ipv6->invflags & ~IP6T_INV_MASK); | |
ccb79bdc | 189 | return false; |
1da177e4 | 190 | } |
ccb79bdc | 191 | return true; |
1da177e4 LT |
192 | } |
193 | ||
194 | static unsigned int | |
4b560b44 | 195 | ip6t_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 LT |
196 | { |
197 | if (net_ratelimit()) | |
ff67e4e4 | 198 | pr_info("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
199 | |
200 | return NF_DROP; | |
201 | } | |
202 | ||
1da177e4 | 203 | static inline struct ip6t_entry * |
d5d1baa1 | 204 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
205 | { |
206 | return (struct ip6t_entry *)(base + offset); | |
207 | } | |
208 | ||
ba9dda3a | 209 | /* All zeroes == unconditional rule. */ |
022748a9 | 210 | /* Mildly perf critical (only if packet tracing is on) */ |
47901dc2 | 211 | static inline bool unconditional(const struct ip6t_ip6 *ipv6) |
ba9dda3a | 212 | { |
47901dc2 | 213 | static const struct ip6t_ip6 uncond; |
ba9dda3a | 214 | |
47901dc2 | 215 | return memcmp(ipv6, &uncond, sizeof(uncond)) == 0; |
ba9dda3a JK |
216 | } |
217 | ||
87a2e70d | 218 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
219 | ip6t_get_target_c(const struct ip6t_entry *e) |
220 | { | |
221 | return ip6t_get_target((struct ip6t_entry *)e); | |
222 | } | |
223 | ||
ba9dda3a JK |
224 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
225 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
226 | /* This cries for unification! */ | |
022748a9 | 227 | static const char *const hooknames[] = { |
6e23ae2a PM |
228 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
229 | [NF_INET_LOCAL_IN] = "INPUT", | |
230 | [NF_INET_FORWARD] = "FORWARD", | |
231 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
232 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
233 | }; |
234 | ||
235 | enum nf_ip_trace_comments { | |
236 | NF_IP6_TRACE_COMMENT_RULE, | |
237 | NF_IP6_TRACE_COMMENT_RETURN, | |
238 | NF_IP6_TRACE_COMMENT_POLICY, | |
239 | }; | |
240 | ||
022748a9 | 241 | static const char *const comments[] = { |
ba9dda3a JK |
242 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
243 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
244 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
245 | }; | |
246 | ||
247 | static struct nf_loginfo trace_loginfo = { | |
248 | .type = NF_LOG_TYPE_LOG, | |
249 | .u = { | |
250 | .log = { | |
251 | .level = 4, | |
252 | .logflags = NF_LOG_MASK, | |
253 | }, | |
254 | }, | |
255 | }; | |
256 | ||
022748a9 | 257 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 258 | static inline int |
d5d1baa1 | 259 | get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e, |
4f2f6f23 JE |
260 | const char *hookname, const char **chainname, |
261 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 262 | { |
87a2e70d | 263 | const struct xt_standard_target *t = (void *)ip6t_get_target_c(s); |
ba9dda3a | 264 | |
243bf6e2 | 265 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
266 | /* Head of user chain: ERROR target with chainname */ |
267 | *chainname = t->target.data; | |
268 | (*rulenum) = 0; | |
269 | } else if (s == e) { | |
270 | (*rulenum)++; | |
271 | ||
3666ed1c JP |
272 | if (s->target_offset == sizeof(struct ip6t_entry) && |
273 | strcmp(t->target.u.kernel.target->name, | |
243bf6e2 | 274 | XT_STANDARD_TARGET) == 0 && |
3666ed1c JP |
275 | t->verdict < 0 && |
276 | unconditional(&s->ipv6)) { | |
ba9dda3a JK |
277 | /* Tail of chains: STANDARD target (return/policy) */ |
278 | *comment = *chainname == hookname | |
4f2f6f23 JE |
279 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
280 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
281 | } |
282 | return 1; | |
283 | } else | |
284 | (*rulenum)++; | |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
d5d1baa1 | 289 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
290 | unsigned int hook, |
291 | const struct net_device *in, | |
292 | const struct net_device *out, | |
ecb6f85e | 293 | const char *tablename, |
d5d1baa1 JE |
294 | const struct xt_table_info *private, |
295 | const struct ip6t_entry *e) | |
ba9dda3a | 296 | { |
d5d1baa1 | 297 | const void *table_base; |
5452e425 | 298 | const struct ip6t_entry *root; |
4f2f6f23 | 299 | const char *hookname, *chainname, *comment; |
72b2b1dd | 300 | const struct ip6t_entry *iter; |
ba9dda3a JK |
301 | unsigned int rulenum = 0; |
302 | ||
ccf5bd8c | 303 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
304 | root = get_entry(table_base, private->hook_entry[hook]); |
305 | ||
4f2f6f23 JE |
306 | hookname = chainname = hooknames[hook]; |
307 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; | |
ba9dda3a | 308 | |
72b2b1dd JE |
309 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
310 | if (get_chainname_rulenum(iter, e, hookname, | |
311 | &chainname, &comment, &rulenum) != 0) | |
312 | break; | |
ba9dda3a JK |
313 | |
314 | nf_log_packet(AF_INET6, hook, skb, in, out, &trace_loginfo, | |
315 | "TRACE: %s:%s:%s:%u ", | |
316 | tablename, chainname, comment, rulenum); | |
317 | } | |
318 | #endif | |
319 | ||
98e86403 JE |
320 | static inline __pure struct ip6t_entry * |
321 | ip6t_next_entry(const struct ip6t_entry *entry) | |
322 | { | |
323 | return (void *)entry + entry->next_offset; | |
324 | } | |
325 | ||
1da177e4 LT |
326 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
327 | unsigned int | |
3db05fea | 328 | ip6t_do_table(struct sk_buff *skb, |
1da177e4 LT |
329 | unsigned int hook, |
330 | const struct net_device *in, | |
331 | const struct net_device *out, | |
fe1cb108 | 332 | struct xt_table *table) |
1da177e4 | 333 | { |
6b7d31fc | 334 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
335 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
336 | unsigned int verdict = NF_DROP; | |
337 | const char *indev, *outdev; | |
d5d1baa1 | 338 | const void *table_base; |
f3c5c1bf JE |
339 | struct ip6t_entry *e, **jumpstack; |
340 | unsigned int *stackptr, origptr, cpu; | |
d5d1baa1 | 341 | const struct xt_table_info *private; |
de74c169 | 342 | struct xt_action_param acpar; |
1da177e4 LT |
343 | |
344 | /* Initialization */ | |
345 | indev = in ? in->name : nulldevname; | |
346 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
347 | /* We handle fragments by dealing with the first fragment as |
348 | * if it was a normal packet. All other fragments are treated | |
349 | * normally, except that they will NEVER match rules that ask | |
350 | * things we don't know, ie. tcp syn flag or ports). If the | |
351 | * rule is also a fragment-specific rule, non-fragments won't | |
352 | * match it. */ | |
b4ba2611 | 353 | acpar.hotdrop = false; |
de74c169 JE |
354 | acpar.in = in; |
355 | acpar.out = out; | |
356 | acpar.family = NFPROTO_IPV6; | |
357 | acpar.hooknum = hook; | |
1da177e4 | 358 | |
1da177e4 | 359 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
78454473 | 360 | |
942e4a2b SH |
361 | xt_info_rdlock_bh(); |
362 | private = table->private; | |
f3c5c1bf JE |
363 | cpu = smp_processor_id(); |
364 | table_base = private->entries[cpu]; | |
365 | jumpstack = (struct ip6t_entry **)private->jumpstack[cpu]; | |
7489aec8 | 366 | stackptr = per_cpu_ptr(private->stackptr, cpu); |
f3c5c1bf | 367 | origptr = *stackptr; |
78454473 | 368 | |
2e4e6a17 | 369 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 370 | |
1da177e4 | 371 | do { |
87a2e70d | 372 | const struct xt_entry_target *t; |
dcea992a | 373 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 374 | |
1da177e4 | 375 | IP_NF_ASSERT(e); |
a1ff4ac8 | 376 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
b4ba2611 | 377 | &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) { |
dcea992a | 378 | no_match: |
a1ff4ac8 JE |
379 | e = ip6t_next_entry(e); |
380 | continue; | |
381 | } | |
1da177e4 | 382 | |
ef53d702 | 383 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
384 | acpar.match = ematch->u.kernel.match; |
385 | acpar.matchinfo = ematch->data; | |
386 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 387 | goto no_match; |
ef53d702 | 388 | } |
dcea992a | 389 | |
261abc8c | 390 | ADD_COUNTER(e->counters, skb->len, 1); |
1da177e4 | 391 | |
d5d1baa1 | 392 | t = ip6t_get_target_c(e); |
a1ff4ac8 | 393 | IP_NF_ASSERT(t->u.kernel.target); |
ba9dda3a JK |
394 | |
395 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
396 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
a1ff4ac8 JE |
397 | /* The packet is traced: log it */ |
398 | if (unlikely(skb->nf_trace)) | |
399 | trace_packet(skb, hook, in, out, | |
400 | table->name, private, e); | |
ba9dda3a | 401 | #endif |
a1ff4ac8 JE |
402 | /* Standard target? */ |
403 | if (!t->u.kernel.target->target) { | |
404 | int v; | |
405 | ||
87a2e70d | 406 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
407 | if (v < 0) { |
408 | /* Pop from stack? */ | |
243bf6e2 | 409 | if (v != XT_RETURN) { |
a1ff4ac8 JE |
410 | verdict = (unsigned)(-v) - 1; |
411 | break; | |
1da177e4 | 412 | } |
db856674 | 413 | if (*stackptr <= origptr) |
f3c5c1bf JE |
414 | e = get_entry(table_base, |
415 | private->underflow[hook]); | |
416 | else | |
417 | e = ip6t_next_entry(jumpstack[--*stackptr]); | |
a1ff4ac8 JE |
418 | continue; |
419 | } | |
3666ed1c JP |
420 | if (table_base + v != ip6t_next_entry(e) && |
421 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
f3c5c1bf JE |
422 | if (*stackptr >= private->stacksize) { |
423 | verdict = NF_DROP; | |
424 | break; | |
425 | } | |
426 | jumpstack[(*stackptr)++] = e; | |
a1ff4ac8 | 427 | } |
1da177e4 | 428 | |
a1ff4ac8 | 429 | e = get_entry(table_base, v); |
7a6b1c46 JE |
430 | continue; |
431 | } | |
432 | ||
de74c169 JE |
433 | acpar.target = t->u.kernel.target; |
434 | acpar.targinfo = t->data; | |
7eb35586 | 435 | |
de74c169 | 436 | verdict = t->u.kernel.target->target(skb, &acpar); |
243bf6e2 | 437 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
438 | e = ip6t_next_entry(e); |
439 | else | |
440 | /* Verdict */ | |
441 | break; | |
b4ba2611 | 442 | } while (!acpar.hotdrop); |
1da177e4 | 443 | |
f3c5c1bf | 444 | *stackptr = origptr; |
db856674 | 445 | xt_info_rdunlock_bh(); |
1da177e4 LT |
446 | |
447 | #ifdef DEBUG_ALLOW_ALL | |
448 | return NF_ACCEPT; | |
449 | #else | |
b4ba2611 | 450 | if (acpar.hotdrop) |
1da177e4 LT |
451 | return NF_DROP; |
452 | else return verdict; | |
453 | #endif | |
454 | } | |
455 | ||
1da177e4 LT |
456 | /* Figures out from what hook each rule can be called: returns 0 if |
457 | there are loops. Puts hook bitmask in comefrom. */ | |
458 | static int | |
d5d1baa1 | 459 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 460 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
461 | { |
462 | unsigned int hook; | |
463 | ||
464 | /* No recursion; use packet counter to save back ptrs (reset | |
465 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 466 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 467 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 468 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
469 | |
470 | if (!(valid_hooks & (1 << hook))) | |
471 | continue; | |
472 | ||
473 | /* Set initial back pointer. */ | |
474 | e->counters.pcnt = pos; | |
475 | ||
476 | for (;;) { | |
87a2e70d | 477 | const struct xt_standard_target *t |
d5d1baa1 | 478 | = (void *)ip6t_get_target_c(e); |
9c547959 | 479 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 480 | |
6e23ae2a | 481 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
654d0fbd | 482 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
483 | hook, pos, e->comefrom); |
484 | return 0; | |
485 | } | |
9c547959 | 486 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
487 | |
488 | /* Unconditional return/END. */ | |
3666ed1c JP |
489 | if ((e->target_offset == sizeof(struct ip6t_entry) && |
490 | (strcmp(t->target.u.user.name, | |
243bf6e2 | 491 | XT_STANDARD_TARGET) == 0) && |
3666ed1c JP |
492 | t->verdict < 0 && |
493 | unconditional(&e->ipv6)) || visited) { | |
1da177e4 LT |
494 | unsigned int oldpos, size; |
495 | ||
1f9352ae | 496 | if ((strcmp(t->target.u.user.name, |
243bf6e2 | 497 | XT_STANDARD_TARGET) == 0) && |
1f9352ae | 498 | t->verdict < -NF_MAX_VERDICT - 1) { |
74c9c0c1 DM |
499 | duprintf("mark_source_chains: bad " |
500 | "negative verdict (%i)\n", | |
501 | t->verdict); | |
502 | return 0; | |
503 | } | |
504 | ||
1da177e4 LT |
505 | /* Return: backtrack through the last |
506 | big jump. */ | |
507 | do { | |
6e23ae2a | 508 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
509 | #ifdef DEBUG_IP_FIREWALL_USER |
510 | if (e->comefrom | |
6e23ae2a | 511 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
512 | duprintf("Back unset " |
513 | "on hook %u " | |
514 | "rule %u\n", | |
515 | hook, pos); | |
516 | } | |
517 | #endif | |
518 | oldpos = pos; | |
519 | pos = e->counters.pcnt; | |
520 | e->counters.pcnt = 0; | |
521 | ||
522 | /* We're at the start. */ | |
523 | if (pos == oldpos) | |
524 | goto next; | |
525 | ||
526 | e = (struct ip6t_entry *) | |
31836064 | 527 | (entry0 + pos); |
1da177e4 LT |
528 | } while (oldpos == pos + e->next_offset); |
529 | ||
530 | /* Move along one */ | |
531 | size = e->next_offset; | |
532 | e = (struct ip6t_entry *) | |
31836064 | 533 | (entry0 + pos + size); |
1da177e4 LT |
534 | e->counters.pcnt = pos; |
535 | pos += size; | |
536 | } else { | |
537 | int newpos = t->verdict; | |
538 | ||
539 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 540 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 541 | newpos >= 0) { |
74c9c0c1 DM |
542 | if (newpos > newinfo->size - |
543 | sizeof(struct ip6t_entry)) { | |
544 | duprintf("mark_source_chains: " | |
545 | "bad verdict (%i)\n", | |
546 | newpos); | |
547 | return 0; | |
548 | } | |
1da177e4 LT |
549 | /* This a jump; chase it. */ |
550 | duprintf("Jump rule %u -> %u\n", | |
551 | pos, newpos); | |
552 | } else { | |
553 | /* ... this is a fallthru */ | |
554 | newpos = pos + e->next_offset; | |
555 | } | |
556 | e = (struct ip6t_entry *) | |
31836064 | 557 | (entry0 + newpos); |
1da177e4 LT |
558 | e->counters.pcnt = pos; |
559 | pos = newpos; | |
560 | } | |
561 | } | |
562 | next: | |
563 | duprintf("Finished chain %u\n", hook); | |
564 | } | |
565 | return 1; | |
566 | } | |
567 | ||
87a2e70d | 568 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 569 | { |
6be3d859 JE |
570 | struct xt_mtdtor_param par; |
571 | ||
f54e9367 | 572 | par.net = net; |
6be3d859 JE |
573 | par.match = m->u.kernel.match; |
574 | par.matchinfo = m->data; | |
916a917d | 575 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
576 | if (par.match->destroy != NULL) |
577 | par.match->destroy(&par); | |
578 | module_put(par.match->me); | |
1da177e4 LT |
579 | } |
580 | ||
022748a9 | 581 | static int |
d5d1baa1 | 582 | check_entry(const struct ip6t_entry *e, const char *name) |
f173c8a1 | 583 | { |
87a2e70d | 584 | const struct xt_entry_target *t; |
f173c8a1 PM |
585 | |
586 | if (!ip6_checkentry(&e->ipv6)) { | |
587 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
588 | return -EINVAL; | |
589 | } | |
590 | ||
87a2e70d | 591 | if (e->target_offset + sizeof(struct xt_entry_target) > |
f173c8a1 PM |
592 | e->next_offset) |
593 | return -EINVAL; | |
594 | ||
d5d1baa1 | 595 | t = ip6t_get_target_c(e); |
f173c8a1 PM |
596 | if (e->target_offset + t->u.target_size > e->next_offset) |
597 | return -EINVAL; | |
598 | ||
599 | return 0; | |
600 | } | |
601 | ||
87a2e70d | 602 | static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
f173c8a1 | 603 | { |
9b4fce7a | 604 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
605 | int ret; |
606 | ||
9b4fce7a JE |
607 | par->match = m->u.kernel.match; |
608 | par->matchinfo = m->data; | |
609 | ||
916a917d | 610 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 611 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
367c6790 | 612 | if (ret < 0) { |
f173c8a1 | 613 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 614 | par.match->name); |
367c6790 | 615 | return ret; |
f173c8a1 | 616 | } |
367c6790 | 617 | return 0; |
f173c8a1 PM |
618 | } |
619 | ||
022748a9 | 620 | static int |
87a2e70d | 621 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 622 | { |
6709dbbb | 623 | struct xt_match *match; |
3cdc7c95 | 624 | int ret; |
1da177e4 | 625 | |
fd0ec0e6 JE |
626 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
627 | m->u.user.revision); | |
628 | if (IS_ERR(match)) { | |
f173c8a1 | 629 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 630 | return PTR_ERR(match); |
1da177e4 LT |
631 | } |
632 | m->u.kernel.match = match; | |
1da177e4 | 633 | |
6bdb331b | 634 | ret = check_match(m, par); |
3cdc7c95 PM |
635 | if (ret) |
636 | goto err; | |
637 | ||
1da177e4 | 638 | return 0; |
3cdc7c95 PM |
639 | err: |
640 | module_put(m->u.kernel.match->me); | |
641 | return ret; | |
1da177e4 LT |
642 | } |
643 | ||
add67461 | 644 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 645 | { |
87a2e70d | 646 | struct xt_entry_target *t = ip6t_get_target(e); |
af5d6dc2 | 647 | struct xt_tgchk_param par = { |
add67461 | 648 | .net = net, |
af5d6dc2 JE |
649 | .table = name, |
650 | .entryinfo = e, | |
651 | .target = t->u.kernel.target, | |
652 | .targinfo = t->data, | |
653 | .hook_mask = e->comefrom, | |
916a917d | 654 | .family = NFPROTO_IPV6, |
af5d6dc2 | 655 | }; |
1da177e4 | 656 | int ret; |
1da177e4 | 657 | |
f173c8a1 | 658 | t = ip6t_get_target(e); |
916a917d | 659 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 660 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
367c6790 | 661 | if (ret < 0) { |
f173c8a1 PM |
662 | duprintf("ip_tables: check failed for `%s'.\n", |
663 | t->u.kernel.target->name); | |
367c6790 | 664 | return ret; |
1da177e4 | 665 | } |
367c6790 | 666 | return 0; |
f173c8a1 | 667 | } |
1da177e4 | 668 | |
022748a9 | 669 | static int |
a83d8e8d | 670 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
0559518b | 671 | unsigned int size) |
f173c8a1 | 672 | { |
87a2e70d | 673 | struct xt_entry_target *t; |
f173c8a1 PM |
674 | struct xt_target *target; |
675 | int ret; | |
676 | unsigned int j; | |
9b4fce7a | 677 | struct xt_mtchk_param mtpar; |
dcea992a | 678 | struct xt_entry_match *ematch; |
f173c8a1 PM |
679 | |
680 | ret = check_entry(e, name); | |
681 | if (ret) | |
682 | return ret; | |
590bdf7f | 683 | |
1da177e4 | 684 | j = 0; |
a83d8e8d | 685 | mtpar.net = net; |
9b4fce7a JE |
686 | mtpar.table = name; |
687 | mtpar.entryinfo = &e->ipv6; | |
688 | mtpar.hook_mask = e->comefrom; | |
916a917d | 689 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 690 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 691 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 692 | if (ret != 0) |
6bdb331b JE |
693 | goto cleanup_matches; |
694 | ++j; | |
dcea992a | 695 | } |
1da177e4 LT |
696 | |
697 | t = ip6t_get_target(e); | |
d2a7b6ba JE |
698 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
699 | t->u.user.revision); | |
700 | if (IS_ERR(target)) { | |
f173c8a1 | 701 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 702 | ret = PTR_ERR(target); |
1da177e4 LT |
703 | goto cleanup_matches; |
704 | } | |
705 | t->u.kernel.target = target; | |
6b7d31fc | 706 | |
add67461 | 707 | ret = check_target(e, net, name); |
3cdc7c95 PM |
708 | if (ret) |
709 | goto err; | |
1da177e4 | 710 | return 0; |
3cdc7c95 PM |
711 | err: |
712 | module_put(t->u.kernel.target->me); | |
1da177e4 | 713 | cleanup_matches: |
6bdb331b JE |
714 | xt_ematch_foreach(ematch, e) { |
715 | if (j-- == 0) | |
dcea992a | 716 | break; |
6bdb331b JE |
717 | cleanup_match(ematch, net); |
718 | } | |
1da177e4 LT |
719 | return ret; |
720 | } | |
721 | ||
d5d1baa1 | 722 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 | 723 | { |
87a2e70d | 724 | const struct xt_entry_target *t; |
e2fe35c1 JE |
725 | unsigned int verdict; |
726 | ||
727 | if (!unconditional(&e->ipv6)) | |
728 | return false; | |
d5d1baa1 | 729 | t = ip6t_get_target_c(e); |
e2fe35c1 JE |
730 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
731 | return false; | |
87a2e70d | 732 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
733 | verdict = -verdict - 1; |
734 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
735 | } | |
736 | ||
022748a9 | 737 | static int |
1da177e4 | 738 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 739 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
740 | const unsigned char *base, |
741 | const unsigned char *limit, | |
1da177e4 LT |
742 | const unsigned int *hook_entries, |
743 | const unsigned int *underflows, | |
0559518b | 744 | unsigned int valid_hooks) |
1da177e4 LT |
745 | { |
746 | unsigned int h; | |
747 | ||
3666ed1c JP |
748 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
749 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
1da177e4 LT |
750 | duprintf("Bad offset %p\n", e); |
751 | return -EINVAL; | |
752 | } | |
753 | ||
754 | if (e->next_offset | |
87a2e70d | 755 | < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) { |
1da177e4 LT |
756 | duprintf("checking: element %p size %u\n", |
757 | e, e->next_offset); | |
758 | return -EINVAL; | |
759 | } | |
760 | ||
761 | /* Check hooks & underflows */ | |
6e23ae2a | 762 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
763 | if (!(valid_hooks & (1 << h))) |
764 | continue; | |
1da177e4 LT |
765 | if ((unsigned char *)e - base == hook_entries[h]) |
766 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 767 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
768 | if (!check_underflow(e)) { |
769 | pr_err("Underflows must be unconditional and " | |
770 | "use the STANDARD target with " | |
771 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
772 | return -EINVAL; |
773 | } | |
1da177e4 | 774 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 775 | } |
1da177e4 LT |
776 | } |
777 | ||
1da177e4 | 778 | /* Clear counters and comefrom */ |
2e4e6a17 | 779 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 780 | e->comefrom = 0; |
1da177e4 LT |
781 | return 0; |
782 | } | |
783 | ||
0559518b | 784 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
1da177e4 | 785 | { |
a2df1648 | 786 | struct xt_tgdtor_param par; |
87a2e70d | 787 | struct xt_entry_target *t; |
dcea992a | 788 | struct xt_entry_match *ematch; |
1da177e4 | 789 | |
1da177e4 | 790 | /* Cleanup all matches */ |
dcea992a | 791 | xt_ematch_foreach(ematch, e) |
6bdb331b | 792 | cleanup_match(ematch, net); |
1da177e4 | 793 | t = ip6t_get_target(e); |
a2df1648 | 794 | |
add67461 | 795 | par.net = net; |
a2df1648 JE |
796 | par.target = t->u.kernel.target; |
797 | par.targinfo = t->data; | |
916a917d | 798 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
799 | if (par.target->destroy != NULL) |
800 | par.target->destroy(&par); | |
801 | module_put(par.target->me); | |
1da177e4 LT |
802 | } |
803 | ||
804 | /* Checks and translates the user-supplied table segment (held in | |
805 | newinfo) */ | |
806 | static int | |
0f234214 JE |
807 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
808 | const struct ip6t_replace *repl) | |
1da177e4 | 809 | { |
72b2b1dd | 810 | struct ip6t_entry *iter; |
1da177e4 | 811 | unsigned int i; |
72b2b1dd | 812 | int ret = 0; |
1da177e4 | 813 | |
0f234214 JE |
814 | newinfo->size = repl->size; |
815 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
816 | |
817 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 818 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
819 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
820 | newinfo->underflow[i] = 0xFFFFFFFF; | |
821 | } | |
822 | ||
823 | duprintf("translate_table: size %u\n", newinfo->size); | |
824 | i = 0; | |
825 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
826 | xt_entry_foreach(iter, entry0, newinfo->size) { |
827 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
828 | entry0 + repl->size, |
829 | repl->hook_entry, | |
830 | repl->underflow, | |
831 | repl->valid_hooks); | |
72b2b1dd | 832 | if (ret != 0) |
0559518b JE |
833 | return ret; |
834 | ++i; | |
f3c5c1bf JE |
835 | if (strcmp(ip6t_get_target(iter)->u.user.name, |
836 | XT_ERROR_TARGET) == 0) | |
837 | ++newinfo->stacksize; | |
72b2b1dd | 838 | } |
1da177e4 | 839 | |
0f234214 | 840 | if (i != repl->num_entries) { |
1da177e4 | 841 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 842 | i, repl->num_entries); |
1da177e4 LT |
843 | return -EINVAL; |
844 | } | |
845 | ||
846 | /* Check hooks all assigned */ | |
6e23ae2a | 847 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 848 | /* Only hooks which are valid */ |
0f234214 | 849 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
850 | continue; |
851 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
852 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 853 | i, repl->hook_entry[i]); |
1da177e4 LT |
854 | return -EINVAL; |
855 | } | |
856 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
857 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 858 | i, repl->underflow[i]); |
1da177e4 LT |
859 | return -EINVAL; |
860 | } | |
861 | } | |
862 | ||
0f234214 | 863 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
864 | return -ELOOP; |
865 | ||
1da177e4 LT |
866 | /* Finally, each sanity check must pass */ |
867 | i = 0; | |
72b2b1dd | 868 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 869 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
870 | if (ret != 0) |
871 | break; | |
0559518b | 872 | ++i; |
72b2b1dd | 873 | } |
1da177e4 | 874 | |
74c9c0c1 | 875 | if (ret != 0) { |
0559518b JE |
876 | xt_entry_foreach(iter, entry0, newinfo->size) { |
877 | if (i-- == 0) | |
72b2b1dd | 878 | break; |
0559518b JE |
879 | cleanup_entry(iter, net); |
880 | } | |
74c9c0c1 DM |
881 | return ret; |
882 | } | |
1da177e4 LT |
883 | |
884 | /* And one copy for every other CPU */ | |
6f912042 | 885 | for_each_possible_cpu(i) { |
31836064 ED |
886 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
887 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
888 | } |
889 | ||
9c547959 | 890 | return ret; |
1da177e4 LT |
891 | } |
892 | ||
1da177e4 | 893 | static void |
2e4e6a17 HW |
894 | get_counters(const struct xt_table_info *t, |
895 | struct xt_counters counters[]) | |
1da177e4 | 896 | { |
72b2b1dd | 897 | struct ip6t_entry *iter; |
1da177e4 LT |
898 | unsigned int cpu; |
899 | unsigned int i; | |
900 | ||
6f912042 | 901 | for_each_possible_cpu(cpu) { |
83723d60 ED |
902 | seqlock_t *lock = &per_cpu(xt_info_locks, cpu).lock; |
903 | ||
1da177e4 | 904 | i = 0; |
0559518b | 905 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
83723d60 ED |
906 | u64 bcnt, pcnt; |
907 | unsigned int start; | |
908 | ||
909 | do { | |
910 | start = read_seqbegin(lock); | |
911 | bcnt = iter->counters.bcnt; | |
912 | pcnt = iter->counters.pcnt; | |
913 | } while (read_seqretry(lock, start)); | |
914 | ||
915 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
916 | ++i; |
917 | } | |
1da177e4 | 918 | } |
78454473 SH |
919 | } |
920 | ||
d5d1baa1 | 921 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 922 | { |
ed1a6f5e | 923 | unsigned int countersize; |
2e4e6a17 | 924 | struct xt_counters *counters; |
d5d1baa1 | 925 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
926 | |
927 | /* We need atomic snapshot of counters: rest doesn't change | |
928 | (other than comefrom, which userspace doesn't care | |
929 | about). */ | |
2e4e6a17 | 930 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 931 | counters = vzalloc(countersize); |
1da177e4 LT |
932 | |
933 | if (counters == NULL) | |
942e4a2b | 934 | return ERR_PTR(-ENOMEM); |
78454473 | 935 | |
942e4a2b | 936 | get_counters(private, counters); |
78454473 | 937 | |
49a88d18 | 938 | return counters; |
ed1a6f5e PM |
939 | } |
940 | ||
941 | static int | |
942 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 943 | const struct xt_table *table, |
ed1a6f5e PM |
944 | void __user *userptr) |
945 | { | |
946 | unsigned int off, num; | |
d5d1baa1 | 947 | const struct ip6t_entry *e; |
ed1a6f5e | 948 | struct xt_counters *counters; |
5452e425 | 949 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 950 | int ret = 0; |
5452e425 | 951 | const void *loc_cpu_entry; |
ed1a6f5e PM |
952 | |
953 | counters = alloc_counters(table); | |
954 | if (IS_ERR(counters)) | |
955 | return PTR_ERR(counters); | |
956 | ||
9c547959 PM |
957 | /* choose the copy that is on our node/cpu, ... |
958 | * This choice is lazy (because current thread is | |
959 | * allowed to migrate to another cpu) | |
960 | */ | |
2e4e6a17 | 961 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 962 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
963 | ret = -EFAULT; |
964 | goto free_counters; | |
965 | } | |
966 | ||
967 | /* FIXME: use iterator macros --RR */ | |
968 | /* ... then go back and fix counters and names */ | |
969 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
970 | unsigned int i; | |
87a2e70d JE |
971 | const struct xt_entry_match *m; |
972 | const struct xt_entry_target *t; | |
1da177e4 | 973 | |
31836064 | 974 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
975 | if (copy_to_user(userptr + off |
976 | + offsetof(struct ip6t_entry, counters), | |
977 | &counters[num], | |
978 | sizeof(counters[num])) != 0) { | |
979 | ret = -EFAULT; | |
980 | goto free_counters; | |
981 | } | |
982 | ||
983 | for (i = sizeof(struct ip6t_entry); | |
984 | i < e->target_offset; | |
985 | i += m->u.match_size) { | |
986 | m = (void *)e + i; | |
987 | ||
988 | if (copy_to_user(userptr + off + i | |
87a2e70d | 989 | + offsetof(struct xt_entry_match, |
1da177e4 LT |
990 | u.user.name), |
991 | m->u.kernel.match->name, | |
992 | strlen(m->u.kernel.match->name)+1) | |
993 | != 0) { | |
994 | ret = -EFAULT; | |
995 | goto free_counters; | |
996 | } | |
997 | } | |
998 | ||
d5d1baa1 | 999 | t = ip6t_get_target_c(e); |
1da177e4 | 1000 | if (copy_to_user(userptr + off + e->target_offset |
87a2e70d | 1001 | + offsetof(struct xt_entry_target, |
1da177e4 LT |
1002 | u.user.name), |
1003 | t->u.kernel.target->name, | |
1004 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1005 | ret = -EFAULT; | |
1006 | goto free_counters; | |
1007 | } | |
1008 | } | |
1009 | ||
1010 | free_counters: | |
1011 | vfree(counters); | |
1012 | return ret; | |
1013 | } | |
1014 | ||
3bc3fe5e | 1015 | #ifdef CONFIG_COMPAT |
739674fb | 1016 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
1017 | { |
1018 | int v = *(compat_int_t *)src; | |
1019 | ||
1020 | if (v > 0) | |
1021 | v += xt_compat_calc_jump(AF_INET6, v); | |
1022 | memcpy(dst, &v, sizeof(v)); | |
1023 | } | |
1024 | ||
739674fb | 1025 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
1026 | { |
1027 | compat_int_t cv = *(int *)src; | |
1028 | ||
1029 | if (cv > 0) | |
1030 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1031 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1032 | } | |
1033 | ||
d5d1baa1 | 1034 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 1035 | const struct xt_table_info *info, |
d5d1baa1 | 1036 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 1037 | { |
dcea992a | 1038 | const struct xt_entry_match *ematch; |
87a2e70d | 1039 | const struct xt_entry_target *t; |
3bc3fe5e PM |
1040 | unsigned int entry_offset; |
1041 | int off, i, ret; | |
1042 | ||
1043 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1044 | entry_offset = (void *)e - base; | |
dcea992a | 1045 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1046 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1047 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
1048 | off += xt_compat_target_offset(t->u.kernel.target); |
1049 | newinfo->size -= off; | |
1050 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1051 | if (ret) | |
1052 | return ret; | |
1053 | ||
1054 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1055 | if (info->hook_entry[i] && | |
1056 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1057 | newinfo->hook_entry[i] -= off; | |
1058 | if (info->underflow[i] && | |
1059 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1060 | newinfo->underflow[i] -= off; | |
1061 | } | |
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | static int compat_table_info(const struct xt_table_info *info, | |
1066 | struct xt_table_info *newinfo) | |
1067 | { | |
72b2b1dd | 1068 | struct ip6t_entry *iter; |
3bc3fe5e | 1069 | void *loc_cpu_entry; |
0559518b | 1070 | int ret; |
3bc3fe5e PM |
1071 | |
1072 | if (!newinfo || !info) | |
1073 | return -EINVAL; | |
1074 | ||
1075 | /* we dont care about newinfo->entries[] */ | |
1076 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1077 | newinfo->initial_entries = 0; | |
1078 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
255d0dc3 | 1079 | xt_compat_init_offsets(AF_INET6, info->number); |
72b2b1dd JE |
1080 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1081 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1082 | if (ret != 0) | |
0559518b | 1083 | return ret; |
72b2b1dd | 1084 | } |
0559518b | 1085 | return 0; |
3bc3fe5e PM |
1086 | } |
1087 | #endif | |
1088 | ||
d5d1baa1 JE |
1089 | static int get_info(struct net *net, void __user *user, |
1090 | const int *len, int compat) | |
433665c9 | 1091 | { |
12b00c2c | 1092 | char name[XT_TABLE_MAXNAMELEN]; |
433665c9 PM |
1093 | struct xt_table *t; |
1094 | int ret; | |
1095 | ||
1096 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1097 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1098 | sizeof(struct ip6t_getinfo)); |
1099 | return -EINVAL; | |
1100 | } | |
1101 | ||
1102 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1103 | return -EFAULT; | |
1104 | ||
12b00c2c | 1105 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
3bc3fe5e PM |
1106 | #ifdef CONFIG_COMPAT |
1107 | if (compat) | |
1108 | xt_compat_lock(AF_INET6); | |
1109 | #endif | |
336b517f | 1110 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 PM |
1111 | "ip6table_%s", name); |
1112 | if (t && !IS_ERR(t)) { | |
1113 | struct ip6t_getinfo info; | |
5452e425 | 1114 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1115 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1116 | struct xt_table_info tmp; |
1117 | ||
3bc3fe5e | 1118 | if (compat) { |
3bc3fe5e PM |
1119 | ret = compat_table_info(private, &tmp); |
1120 | xt_compat_flush_offsets(AF_INET6); | |
1121 | private = &tmp; | |
1122 | } | |
1123 | #endif | |
cccbe5ef | 1124 | memset(&info, 0, sizeof(info)); |
433665c9 PM |
1125 | info.valid_hooks = t->valid_hooks; |
1126 | memcpy(info.hook_entry, private->hook_entry, | |
1127 | sizeof(info.hook_entry)); | |
1128 | memcpy(info.underflow, private->underflow, | |
1129 | sizeof(info.underflow)); | |
1130 | info.num_entries = private->number; | |
1131 | info.size = private->size; | |
b5dd674b | 1132 | strcpy(info.name, name); |
433665c9 PM |
1133 | |
1134 | if (copy_to_user(user, &info, *len) != 0) | |
1135 | ret = -EFAULT; | |
1136 | else | |
1137 | ret = 0; | |
1138 | ||
1139 | xt_table_unlock(t); | |
1140 | module_put(t->me); | |
1141 | } else | |
1142 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1143 | #ifdef CONFIG_COMPAT |
1144 | if (compat) | |
1145 | xt_compat_unlock(AF_INET6); | |
1146 | #endif | |
433665c9 PM |
1147 | return ret; |
1148 | } | |
1149 | ||
1da177e4 | 1150 | static int |
d5d1baa1 JE |
1151 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
1152 | const int *len) | |
1da177e4 LT |
1153 | { |
1154 | int ret; | |
d924357c | 1155 | struct ip6t_get_entries get; |
2e4e6a17 | 1156 | struct xt_table *t; |
1da177e4 | 1157 | |
d924357c | 1158 | if (*len < sizeof(get)) { |
c9d8fe13 | 1159 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1160 | return -EINVAL; |
1161 | } | |
1162 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1163 | return -EFAULT; | |
1164 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1165 | duprintf("get_entries: %u != %zu\n", |
1166 | *len, sizeof(get) + get.size); | |
d924357c PM |
1167 | return -EINVAL; |
1168 | } | |
1169 | ||
336b517f | 1170 | t = xt_find_table_lock(net, AF_INET6, get.name); |
6b7d31fc | 1171 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
1172 | struct xt_table_info *private = t->private; |
1173 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1174 | if (get.size == private->size) |
2e4e6a17 | 1175 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1176 | t, uptr->entrytable); |
1177 | else { | |
1178 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1179 | private->size, get.size); |
544473c1 | 1180 | ret = -EAGAIN; |
1da177e4 | 1181 | } |
6b7d31fc | 1182 | module_put(t->me); |
2e4e6a17 | 1183 | xt_table_unlock(t); |
1da177e4 | 1184 | } else |
6b7d31fc | 1185 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1186 | |
1187 | return ret; | |
1188 | } | |
1189 | ||
1190 | static int | |
336b517f | 1191 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1192 | struct xt_table_info *newinfo, unsigned int num_counters, |
1193 | void __user *counters_ptr) | |
1da177e4 LT |
1194 | { |
1195 | int ret; | |
2e4e6a17 | 1196 | struct xt_table *t; |
3bc3fe5e | 1197 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1198 | struct xt_counters *counters; |
5452e425 | 1199 | const void *loc_cpu_old_entry; |
72b2b1dd | 1200 | struct ip6t_entry *iter; |
1da177e4 | 1201 | |
3bc3fe5e | 1202 | ret = 0; |
83723d60 | 1203 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
1da177e4 LT |
1204 | if (!counters) { |
1205 | ret = -ENOMEM; | |
3bc3fe5e | 1206 | goto out; |
1da177e4 | 1207 | } |
1da177e4 | 1208 | |
336b517f | 1209 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1210 | "ip6table_%s", name); |
6b7d31fc HW |
1211 | if (!t || IS_ERR(t)) { |
1212 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1213 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1214 | } |
1da177e4 LT |
1215 | |
1216 | /* You lied! */ | |
3bc3fe5e | 1217 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1218 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1219 | valid_hooks, t->valid_hooks); |
1da177e4 | 1220 | ret = -EINVAL; |
6b7d31fc | 1221 | goto put_module; |
1da177e4 LT |
1222 | } |
1223 | ||
3bc3fe5e | 1224 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1225 | if (!oldinfo) |
1226 | goto put_module; | |
1227 | ||
1228 | /* Update module usage count based on number of rules */ | |
1229 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1230 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1231 | if ((oldinfo->number > oldinfo->initial_entries) || |
1232 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1233 | module_put(t->me); |
1234 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1235 | (newinfo->number <= oldinfo->initial_entries)) | |
1236 | module_put(t->me); | |
1237 | ||
942e4a2b | 1238 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1239 | get_counters(oldinfo, counters); |
942e4a2b | 1240 | |
1da177e4 | 1241 | /* Decrease module usage counts and free resource */ |
31836064 | 1242 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
72b2b1dd | 1243 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1244 | cleanup_entry(iter, net); |
72b2b1dd | 1245 | |
2e4e6a17 | 1246 | xt_free_table_info(oldinfo); |
3bc3fe5e PM |
1247 | if (copy_to_user(counters_ptr, counters, |
1248 | sizeof(struct xt_counters) * num_counters) != 0) | |
1da177e4 LT |
1249 | ret = -EFAULT; |
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; | |
6a8ab060 | 1278 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1279 | |
1280 | newinfo = xt_alloc_table_info(tmp.size); | |
1281 | if (!newinfo) | |
1282 | return -ENOMEM; | |
1283 | ||
1284 | /* choose the copy that is on our node/cpu */ | |
1285 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1286 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1287 | tmp.size) != 0) { | |
1288 | ret = -EFAULT; | |
1289 | goto free_newinfo; | |
1290 | } | |
1291 | ||
0f234214 | 1292 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1293 | if (ret != 0) |
1294 | goto free_newinfo; | |
1295 | ||
1296 | duprintf("ip_tables: Translated table\n"); | |
1297 | ||
336b517f | 1298 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1299 | tmp.num_counters, tmp.counters); |
1300 | if (ret) | |
1301 | goto free_newinfo_untrans; | |
1302 | return 0; | |
1303 | ||
1304 | free_newinfo_untrans: | |
72b2b1dd | 1305 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1306 | cleanup_entry(iter, net); |
1da177e4 | 1307 | free_newinfo: |
2e4e6a17 | 1308 | xt_free_table_info(newinfo); |
1da177e4 LT |
1309 | return ret; |
1310 | } | |
1311 | ||
1da177e4 | 1312 | static int |
d5d1baa1 | 1313 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
336b517f | 1314 | int compat) |
1da177e4 | 1315 | { |
942e4a2b | 1316 | unsigned int i, curcpu; |
3bc3fe5e PM |
1317 | struct xt_counters_info tmp; |
1318 | struct xt_counters *paddc; | |
1319 | unsigned int num_counters; | |
1320 | char *name; | |
1321 | int size; | |
1322 | void *ptmp; | |
2e4e6a17 | 1323 | struct xt_table *t; |
5452e425 | 1324 | const struct xt_table_info *private; |
6b7d31fc | 1325 | int ret = 0; |
5452e425 | 1326 | const void *loc_cpu_entry; |
72b2b1dd | 1327 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1328 | #ifdef CONFIG_COMPAT |
1329 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1330 | |
3bc3fe5e PM |
1331 | if (compat) { |
1332 | ptmp = &compat_tmp; | |
1333 | size = sizeof(struct compat_xt_counters_info); | |
1334 | } else | |
1335 | #endif | |
1336 | { | |
1337 | ptmp = &tmp; | |
1338 | size = sizeof(struct xt_counters_info); | |
1339 | } | |
1340 | ||
1341 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1342 | return -EFAULT; |
1343 | ||
3bc3fe5e PM |
1344 | #ifdef CONFIG_COMPAT |
1345 | if (compat) { | |
1346 | num_counters = compat_tmp.num_counters; | |
1347 | name = compat_tmp.name; | |
1348 | } else | |
1349 | #endif | |
1350 | { | |
1351 | num_counters = tmp.num_counters; | |
1352 | name = tmp.name; | |
1353 | } | |
1354 | ||
1355 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1356 | return -EINVAL; |
1357 | ||
e12f8e29 | 1358 | paddc = vmalloc(len - size); |
1da177e4 LT |
1359 | if (!paddc) |
1360 | return -ENOMEM; | |
1361 | ||
3bc3fe5e | 1362 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1363 | ret = -EFAULT; |
1364 | goto free; | |
1365 | } | |
1366 | ||
336b517f | 1367 | t = xt_find_table_lock(net, AF_INET6, name); |
6b7d31fc HW |
1368 | if (!t || IS_ERR(t)) { |
1369 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1370 | goto free; |
6b7d31fc | 1371 | } |
1da177e4 | 1372 | |
942e4a2b SH |
1373 | |
1374 | local_bh_disable(); | |
2e4e6a17 | 1375 | private = t->private; |
3bc3fe5e | 1376 | if (private->number != num_counters) { |
1da177e4 LT |
1377 | ret = -EINVAL; |
1378 | goto unlock_up_free; | |
1379 | } | |
1380 | ||
1381 | i = 0; | |
31836064 | 1382 | /* Choose the copy that is on our node */ |
942e4a2b SH |
1383 | curcpu = smp_processor_id(); |
1384 | xt_info_wrlock(curcpu); | |
1385 | loc_cpu_entry = private->entries[curcpu]; | |
0559518b JE |
1386 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1387 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1388 | ++i; | |
1389 | } | |
942e4a2b SH |
1390 | xt_info_wrunlock(curcpu); |
1391 | ||
1da177e4 | 1392 | unlock_up_free: |
942e4a2b | 1393 | local_bh_enable(); |
2e4e6a17 | 1394 | xt_table_unlock(t); |
6b7d31fc | 1395 | module_put(t->me); |
1da177e4 LT |
1396 | free: |
1397 | vfree(paddc); | |
1398 | ||
1399 | return ret; | |
1400 | } | |
1401 | ||
3bc3fe5e PM |
1402 | #ifdef CONFIG_COMPAT |
1403 | struct compat_ip6t_replace { | |
12b00c2c | 1404 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1405 | u32 valid_hooks; |
1406 | u32 num_entries; | |
1407 | u32 size; | |
1408 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1409 | u32 underflow[NF_INET_NUMHOOKS]; | |
1410 | u32 num_counters; | |
87a2e70d | 1411 | compat_uptr_t counters; /* struct xt_counters * */ |
3bc3fe5e PM |
1412 | struct compat_ip6t_entry entries[0]; |
1413 | }; | |
1414 | ||
1415 | static int | |
1416 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1417 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1418 | unsigned int i) |
3bc3fe5e | 1419 | { |
87a2e70d | 1420 | struct xt_entry_target *t; |
3bc3fe5e PM |
1421 | struct compat_ip6t_entry __user *ce; |
1422 | u_int16_t target_offset, next_offset; | |
1423 | compat_uint_t origsize; | |
dcea992a JE |
1424 | const struct xt_entry_match *ematch; |
1425 | int ret = 0; | |
3bc3fe5e | 1426 | |
3bc3fe5e PM |
1427 | origsize = *size; |
1428 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
0559518b JE |
1429 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1430 | copy_to_user(&ce->counters, &counters[i], | |
1431 | sizeof(counters[i])) != 0) | |
1432 | return -EFAULT; | |
3bc3fe5e PM |
1433 | |
1434 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1435 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1436 | ||
dcea992a JE |
1437 | xt_ematch_foreach(ematch, e) { |
1438 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1439 | if (ret != 0) | |
6bdb331b | 1440 | return ret; |
dcea992a | 1441 | } |
3bc3fe5e | 1442 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1443 | t = ip6t_get_target(e); |
1444 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1445 | if (ret) | |
0559518b | 1446 | return ret; |
3bc3fe5e | 1447 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1448 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1449 | put_user(next_offset, &ce->next_offset) != 0) | |
1450 | return -EFAULT; | |
3bc3fe5e | 1451 | return 0; |
3bc3fe5e PM |
1452 | } |
1453 | ||
022748a9 | 1454 | static int |
87a2e70d | 1455 | compat_find_calc_match(struct xt_entry_match *m, |
3bc3fe5e PM |
1456 | const char *name, |
1457 | const struct ip6t_ip6 *ipv6, | |
1458 | unsigned int hookmask, | |
6bdb331b | 1459 | int *size) |
3bc3fe5e PM |
1460 | { |
1461 | struct xt_match *match; | |
1462 | ||
fd0ec0e6 JE |
1463 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
1464 | m->u.user.revision); | |
1465 | if (IS_ERR(match)) { | |
3bc3fe5e PM |
1466 | duprintf("compat_check_calc_match: `%s' not found\n", |
1467 | m->u.user.name); | |
fd0ec0e6 | 1468 | return PTR_ERR(match); |
3bc3fe5e PM |
1469 | } |
1470 | m->u.kernel.match = match; | |
1471 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1472 | return 0; |
1473 | } | |
1474 | ||
0559518b | 1475 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e | 1476 | { |
87a2e70d | 1477 | struct xt_entry_target *t; |
dcea992a | 1478 | struct xt_entry_match *ematch; |
3bc3fe5e | 1479 | |
3bc3fe5e | 1480 | /* Cleanup all matches */ |
dcea992a | 1481 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1482 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1483 | t = compat_ip6t_get_target(e); |
1484 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1485 | } |
1486 | ||
022748a9 | 1487 | static int |
3bc3fe5e PM |
1488 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1489 | struct xt_table_info *newinfo, | |
1490 | unsigned int *size, | |
d5d1baa1 JE |
1491 | const unsigned char *base, |
1492 | const unsigned char *limit, | |
1493 | const unsigned int *hook_entries, | |
1494 | const unsigned int *underflows, | |
3bc3fe5e PM |
1495 | const char *name) |
1496 | { | |
dcea992a | 1497 | struct xt_entry_match *ematch; |
87a2e70d | 1498 | struct xt_entry_target *t; |
3bc3fe5e PM |
1499 | struct xt_target *target; |
1500 | unsigned int entry_offset; | |
b0a6363c PM |
1501 | unsigned int j; |
1502 | int ret, off, h; | |
3bc3fe5e PM |
1503 | |
1504 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1505 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
1506 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
3bc3fe5e PM |
1507 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1508 | return -EINVAL; | |
1509 | } | |
1510 | ||
1511 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1512 | sizeof(struct compat_xt_entry_target)) { | |
1513 | duprintf("checking: element %p size %u\n", | |
1514 | e, e->next_offset); | |
1515 | return -EINVAL; | |
1516 | } | |
1517 | ||
1518 | /* For purposes of check_entry casting the compat entry is fine */ | |
1519 | ret = check_entry((struct ip6t_entry *)e, name); | |
1520 | if (ret) | |
1521 | return ret; | |
1522 | ||
1523 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1524 | entry_offset = (void *)e - (void *)base; | |
1525 | j = 0; | |
dcea992a JE |
1526 | xt_ematch_foreach(ematch, e) { |
1527 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1528 | &e->ipv6, e->comefrom, &off); |
dcea992a | 1529 | if (ret != 0) |
6bdb331b JE |
1530 | goto release_matches; |
1531 | ++j; | |
dcea992a | 1532 | } |
3bc3fe5e PM |
1533 | |
1534 | t = compat_ip6t_get_target(e); | |
d2a7b6ba JE |
1535 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
1536 | t->u.user.revision); | |
1537 | if (IS_ERR(target)) { | |
3bc3fe5e PM |
1538 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
1539 | t->u.user.name); | |
d2a7b6ba | 1540 | ret = PTR_ERR(target); |
3bc3fe5e PM |
1541 | goto release_matches; |
1542 | } | |
1543 | t->u.kernel.target = target; | |
1544 | ||
1545 | off += xt_compat_target_offset(target); | |
1546 | *size += off; | |
1547 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1548 | if (ret) | |
1549 | goto out; | |
1550 | ||
1551 | /* Check hooks & underflows */ | |
1552 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1553 | if ((unsigned char *)e - base == hook_entries[h]) | |
1554 | newinfo->hook_entry[h] = hook_entries[h]; | |
1555 | if ((unsigned char *)e - base == underflows[h]) | |
1556 | newinfo->underflow[h] = underflows[h]; | |
1557 | } | |
1558 | ||
1559 | /* Clear counters and comefrom */ | |
1560 | memset(&e->counters, 0, sizeof(e->counters)); | |
1561 | e->comefrom = 0; | |
3bc3fe5e PM |
1562 | return 0; |
1563 | ||
1564 | out: | |
1565 | module_put(t->u.kernel.target->me); | |
1566 | release_matches: | |
6bdb331b JE |
1567 | xt_ematch_foreach(ematch, e) { |
1568 | if (j-- == 0) | |
dcea992a | 1569 | break; |
6bdb331b JE |
1570 | module_put(ematch->u.kernel.match->me); |
1571 | } | |
3bc3fe5e PM |
1572 | return ret; |
1573 | } | |
1574 | ||
1575 | static int | |
1576 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1577 | unsigned int *size, const char *name, | |
1578 | struct xt_table_info *newinfo, unsigned char *base) | |
1579 | { | |
87a2e70d | 1580 | struct xt_entry_target *t; |
3bc3fe5e PM |
1581 | struct xt_target *target; |
1582 | struct ip6t_entry *de; | |
1583 | unsigned int origsize; | |
1584 | int ret, h; | |
dcea992a | 1585 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1586 | |
1587 | ret = 0; | |
1588 | origsize = *size; | |
1589 | de = (struct ip6t_entry *)*dstptr; | |
1590 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1591 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1592 | ||
1593 | *dstptr += sizeof(struct ip6t_entry); | |
1594 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1595 | ||
dcea992a JE |
1596 | xt_ematch_foreach(ematch, e) { |
1597 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1598 | if (ret != 0) | |
6bdb331b | 1599 | return ret; |
dcea992a | 1600 | } |
3bc3fe5e PM |
1601 | de->target_offset = e->target_offset - (origsize - *size); |
1602 | t = compat_ip6t_get_target(e); | |
1603 | target = t->u.kernel.target; | |
1604 | xt_compat_target_from_user(t, dstptr, size); | |
1605 | ||
1606 | de->next_offset = e->next_offset - (origsize - *size); | |
1607 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1608 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1609 | newinfo->hook_entry[h] -= origsize - *size; | |
1610 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1611 | newinfo->underflow[h] -= origsize - *size; | |
1612 | } | |
1613 | return ret; | |
1614 | } | |
1615 | ||
f54e9367 | 1616 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
0559518b | 1617 | const char *name) |
3bc3fe5e | 1618 | { |
b0a6363c | 1619 | unsigned int j; |
dcea992a | 1620 | int ret = 0; |
9b4fce7a | 1621 | struct xt_mtchk_param mtpar; |
dcea992a | 1622 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1623 | |
1624 | j = 0; | |
f54e9367 | 1625 | mtpar.net = net; |
9b4fce7a JE |
1626 | mtpar.table = name; |
1627 | mtpar.entryinfo = &e->ipv6; | |
1628 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1629 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 1630 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1631 | ret = check_match(ematch, &mtpar); |
dcea992a | 1632 | if (ret != 0) |
6bdb331b JE |
1633 | goto cleanup_matches; |
1634 | ++j; | |
dcea992a | 1635 | } |
3bc3fe5e | 1636 | |
add67461 | 1637 | ret = check_target(e, net, name); |
3bc3fe5e PM |
1638 | if (ret) |
1639 | goto cleanup_matches; | |
3bc3fe5e PM |
1640 | return 0; |
1641 | ||
1642 | cleanup_matches: | |
6bdb331b JE |
1643 | xt_ematch_foreach(ematch, e) { |
1644 | if (j-- == 0) | |
dcea992a | 1645 | break; |
6bdb331b JE |
1646 | cleanup_match(ematch, net); |
1647 | } | |
3bc3fe5e PM |
1648 | return ret; |
1649 | } | |
1650 | ||
1651 | static int | |
f54e9367 AD |
1652 | translate_compat_table(struct net *net, |
1653 | const char *name, | |
3bc3fe5e PM |
1654 | unsigned int valid_hooks, |
1655 | struct xt_table_info **pinfo, | |
1656 | void **pentry0, | |
1657 | unsigned int total_size, | |
1658 | unsigned int number, | |
1659 | unsigned int *hook_entries, | |
1660 | unsigned int *underflows) | |
1661 | { | |
1662 | unsigned int i, j; | |
1663 | struct xt_table_info *newinfo, *info; | |
1664 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1665 | struct compat_ip6t_entry *iter0; |
1666 | struct ip6t_entry *iter1; | |
3bc3fe5e | 1667 | unsigned int size; |
72b2b1dd | 1668 | int ret = 0; |
3bc3fe5e PM |
1669 | |
1670 | info = *pinfo; | |
1671 | entry0 = *pentry0; | |
1672 | size = total_size; | |
1673 | info->number = number; | |
1674 | ||
1675 | /* Init all hooks to impossible value. */ | |
1676 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1677 | info->hook_entry[i] = 0xFFFFFFFF; | |
1678 | info->underflow[i] = 0xFFFFFFFF; | |
1679 | } | |
1680 | ||
1681 | duprintf("translate_compat_table: size %u\n", info->size); | |
1682 | j = 0; | |
1683 | xt_compat_lock(AF_INET6); | |
255d0dc3 | 1684 | xt_compat_init_offsets(AF_INET6, number); |
3bc3fe5e | 1685 | /* Walk through entries, checking offsets. */ |
72b2b1dd JE |
1686 | xt_entry_foreach(iter0, entry0, total_size) { |
1687 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1688 | entry0, |
1689 | entry0 + total_size, | |
1690 | hook_entries, | |
1691 | underflows, | |
1692 | name); | |
72b2b1dd | 1693 | if (ret != 0) |
0559518b JE |
1694 | goto out_unlock; |
1695 | ++j; | |
72b2b1dd | 1696 | } |
3bc3fe5e PM |
1697 | |
1698 | ret = -EINVAL; | |
1699 | if (j != number) { | |
1700 | duprintf("translate_compat_table: %u not %u entries\n", | |
1701 | j, number); | |
1702 | goto out_unlock; | |
1703 | } | |
1704 | ||
1705 | /* Check hooks all assigned */ | |
1706 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1707 | /* Only hooks which are valid */ | |
1708 | if (!(valid_hooks & (1 << i))) | |
1709 | continue; | |
1710 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1711 | duprintf("Invalid hook entry %u %u\n", | |
1712 | i, hook_entries[i]); | |
1713 | goto out_unlock; | |
1714 | } | |
1715 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1716 | duprintf("Invalid underflow %u %u\n", | |
1717 | i, underflows[i]); | |
1718 | goto out_unlock; | |
1719 | } | |
1720 | } | |
1721 | ||
1722 | ret = -ENOMEM; | |
1723 | newinfo = xt_alloc_table_info(size); | |
1724 | if (!newinfo) | |
1725 | goto out_unlock; | |
1726 | ||
1727 | newinfo->number = number; | |
1728 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1729 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1730 | newinfo->underflow[i] = info->underflow[i]; | |
1731 | } | |
1732 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1733 | pos = entry1; | |
1734 | size = total_size; | |
72b2b1dd | 1735 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1736 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1737 | name, newinfo, entry1); | |
72b2b1dd JE |
1738 | if (ret != 0) |
1739 | break; | |
1740 | } | |
3bc3fe5e PM |
1741 | xt_compat_flush_offsets(AF_INET6); |
1742 | xt_compat_unlock(AF_INET6); | |
1743 | if (ret) | |
1744 | goto free_newinfo; | |
1745 | ||
1746 | ret = -ELOOP; | |
1747 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1748 | goto free_newinfo; | |
1749 | ||
1750 | i = 0; | |
72b2b1dd | 1751 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1752 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1753 | if (ret != 0) |
1754 | break; | |
0559518b | 1755 | ++i; |
cca77b7c FW |
1756 | if (strcmp(ip6t_get_target(iter1)->u.user.name, |
1757 | XT_ERROR_TARGET) == 0) | |
1758 | ++newinfo->stacksize; | |
72b2b1dd | 1759 | } |
3bc3fe5e | 1760 | if (ret) { |
72b2b1dd JE |
1761 | /* |
1762 | * The first i matches need cleanup_entry (calls ->destroy) | |
1763 | * because they had called ->check already. The other j-i | |
1764 | * entries need only release. | |
1765 | */ | |
1766 | int skip = i; | |
3bc3fe5e | 1767 | j -= i; |
72b2b1dd JE |
1768 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1769 | if (skip-- > 0) | |
1770 | continue; | |
0559518b | 1771 | if (j-- == 0) |
72b2b1dd | 1772 | break; |
0559518b | 1773 | compat_release_entry(iter0); |
72b2b1dd | 1774 | } |
0559518b JE |
1775 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1776 | if (i-- == 0) | |
72b2b1dd | 1777 | break; |
0559518b JE |
1778 | cleanup_entry(iter1, net); |
1779 | } | |
3bc3fe5e PM |
1780 | xt_free_table_info(newinfo); |
1781 | return ret; | |
1782 | } | |
1783 | ||
1784 | /* And one copy for every other CPU */ | |
1785 | for_each_possible_cpu(i) | |
1786 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1787 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1788 | ||
1789 | *pinfo = newinfo; | |
1790 | *pentry0 = entry1; | |
1791 | xt_free_table_info(info); | |
1792 | return 0; | |
1793 | ||
1794 | free_newinfo: | |
1795 | xt_free_table_info(newinfo); | |
1796 | out: | |
0559518b JE |
1797 | xt_entry_foreach(iter0, entry0, total_size) { |
1798 | if (j-- == 0) | |
72b2b1dd | 1799 | break; |
0559518b JE |
1800 | compat_release_entry(iter0); |
1801 | } | |
3bc3fe5e PM |
1802 | return ret; |
1803 | out_unlock: | |
1804 | xt_compat_flush_offsets(AF_INET6); | |
1805 | xt_compat_unlock(AF_INET6); | |
1806 | goto out; | |
1807 | } | |
1808 | ||
1809 | static int | |
336b517f | 1810 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1811 | { |
1812 | int ret; | |
1813 | struct compat_ip6t_replace tmp; | |
1814 | struct xt_table_info *newinfo; | |
1815 | void *loc_cpu_entry; | |
72b2b1dd | 1816 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1817 | |
1818 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1819 | return -EFAULT; | |
1820 | ||
1821 | /* overflow check */ | |
1822 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1823 | return -ENOMEM; | |
1824 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1825 | return -ENOMEM; | |
6a8ab060 | 1826 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1827 | |
1828 | newinfo = xt_alloc_table_info(tmp.size); | |
1829 | if (!newinfo) | |
1830 | return -ENOMEM; | |
1831 | ||
9c547959 | 1832 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1833 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1834 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1835 | tmp.size) != 0) { | |
1836 | ret = -EFAULT; | |
1837 | goto free_newinfo; | |
1838 | } | |
1839 | ||
f54e9367 | 1840 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1841 | &newinfo, &loc_cpu_entry, tmp.size, |
1842 | tmp.num_entries, tmp.hook_entry, | |
1843 | tmp.underflow); | |
1844 | if (ret != 0) | |
1845 | goto free_newinfo; | |
1846 | ||
1847 | duprintf("compat_do_replace: Translated table\n"); | |
1848 | ||
336b517f | 1849 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1850 | tmp.num_counters, compat_ptr(tmp.counters)); |
1851 | if (ret) | |
1852 | goto free_newinfo_untrans; | |
1853 | return 0; | |
1854 | ||
1855 | free_newinfo_untrans: | |
72b2b1dd | 1856 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1857 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1858 | free_newinfo: |
1859 | xt_free_table_info(newinfo); | |
1860 | return ret; | |
1861 | } | |
1862 | ||
1863 | static int | |
1864 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1865 | unsigned int len) | |
1866 | { | |
1867 | int ret; | |
1868 | ||
1869 | if (!capable(CAP_NET_ADMIN)) | |
1870 | return -EPERM; | |
1871 | ||
1872 | switch (cmd) { | |
1873 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1874 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1875 | break; |
1876 | ||
1877 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1878 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1879 | break; |
1880 | ||
1881 | default: | |
1882 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1883 | ret = -EINVAL; | |
1884 | } | |
1885 | ||
1886 | return ret; | |
1887 | } | |
1888 | ||
1889 | struct compat_ip6t_get_entries { | |
12b00c2c | 1890 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1891 | compat_uint_t size; |
1892 | struct compat_ip6t_entry entrytable[0]; | |
1893 | }; | |
1894 | ||
1895 | static int | |
1896 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1897 | void __user *userptr) | |
1898 | { | |
1899 | struct xt_counters *counters; | |
5452e425 | 1900 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1901 | void __user *pos; |
1902 | unsigned int size; | |
1903 | int ret = 0; | |
5452e425 | 1904 | const void *loc_cpu_entry; |
3bc3fe5e | 1905 | unsigned int i = 0; |
72b2b1dd | 1906 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1907 | |
1908 | counters = alloc_counters(table); | |
1909 | if (IS_ERR(counters)) | |
1910 | return PTR_ERR(counters); | |
1911 | ||
1912 | /* choose the copy that is on our node/cpu, ... | |
1913 | * This choice is lazy (because current thread is | |
1914 | * allowed to migrate to another cpu) | |
1915 | */ | |
1916 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1917 | pos = userptr; | |
1918 | size = total_size; | |
72b2b1dd JE |
1919 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1920 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1921 | &size, counters, i++); |
72b2b1dd JE |
1922 | if (ret != 0) |
1923 | break; | |
1924 | } | |
3bc3fe5e PM |
1925 | |
1926 | vfree(counters); | |
1927 | return ret; | |
1928 | } | |
1929 | ||
1930 | static int | |
336b517f AD |
1931 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1932 | int *len) | |
3bc3fe5e PM |
1933 | { |
1934 | int ret; | |
1935 | struct compat_ip6t_get_entries get; | |
1936 | struct xt_table *t; | |
1937 | ||
1938 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1939 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1940 | return -EINVAL; |
1941 | } | |
1942 | ||
1943 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1944 | return -EFAULT; | |
1945 | ||
1946 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1947 | duprintf("compat_get_entries: %u != %zu\n", |
1948 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1949 | return -EINVAL; |
1950 | } | |
1951 | ||
1952 | xt_compat_lock(AF_INET6); | |
336b517f | 1953 | t = xt_find_table_lock(net, AF_INET6, get.name); |
3bc3fe5e | 1954 | if (t && !IS_ERR(t)) { |
5452e425 | 1955 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1956 | struct xt_table_info info; |
9c547959 | 1957 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1958 | ret = compat_table_info(private, &info); |
1959 | if (!ret && get.size == info.size) { | |
1960 | ret = compat_copy_entries_to_user(private->size, | |
1961 | t, uptr->entrytable); | |
1962 | } else if (!ret) { | |
1963 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1964 | private->size, get.size); |
544473c1 | 1965 | ret = -EAGAIN; |
3bc3fe5e PM |
1966 | } |
1967 | xt_compat_flush_offsets(AF_INET6); | |
1968 | module_put(t->me); | |
1969 | xt_table_unlock(t); | |
1970 | } else | |
1971 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1972 | ||
1973 | xt_compat_unlock(AF_INET6); | |
1974 | return ret; | |
1975 | } | |
1976 | ||
1977 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
1978 | ||
1979 | static int | |
1980 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1981 | { | |
1982 | int ret; | |
1983 | ||
1984 | if (!capable(CAP_NET_ADMIN)) | |
1985 | return -EPERM; | |
1986 | ||
1987 | switch (cmd) { | |
1988 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 1989 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1990 | break; |
1991 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 1992 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
1993 | break; |
1994 | default: | |
1995 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
1996 | } | |
1997 | return ret; | |
1998 | } | |
1999 | #endif | |
2000 | ||
1da177e4 LT |
2001 | static int |
2002 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2003 | { | |
2004 | int ret; | |
2005 | ||
2006 | if (!capable(CAP_NET_ADMIN)) | |
2007 | return -EPERM; | |
2008 | ||
2009 | switch (cmd) { | |
2010 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2011 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2012 | break; |
2013 | ||
2014 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2015 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2016 | break; |
2017 | ||
2018 | default: | |
2019 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2020 | ret = -EINVAL; | |
2021 | } | |
2022 | ||
2023 | return ret; | |
2024 | } | |
2025 | ||
2026 | static int | |
2027 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2028 | { | |
2029 | int ret; | |
2030 | ||
2031 | if (!capable(CAP_NET_ADMIN)) | |
2032 | return -EPERM; | |
2033 | ||
2034 | switch (cmd) { | |
433665c9 | 2035 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2036 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2037 | break; |
1da177e4 | 2038 | |
d924357c | 2039 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2040 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2041 | break; |
1da177e4 | 2042 | |
6b7d31fc HW |
2043 | case IP6T_SO_GET_REVISION_MATCH: |
2044 | case IP6T_SO_GET_REVISION_TARGET: { | |
12b00c2c | 2045 | struct xt_get_revision rev; |
2e4e6a17 | 2046 | int target; |
6b7d31fc HW |
2047 | |
2048 | if (*len != sizeof(rev)) { | |
2049 | ret = -EINVAL; | |
2050 | break; | |
2051 | } | |
2052 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2053 | ret = -EFAULT; | |
2054 | break; | |
2055 | } | |
6a8ab060 | 2056 | rev.name[sizeof(rev.name)-1] = 0; |
6b7d31fc HW |
2057 | |
2058 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2059 | target = 1; |
6b7d31fc | 2060 | else |
2e4e6a17 | 2061 | target = 0; |
6b7d31fc | 2062 | |
2e4e6a17 HW |
2063 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2064 | rev.revision, | |
2065 | target, &ret), | |
6b7d31fc HW |
2066 | "ip6t_%s", rev.name); |
2067 | break; | |
2068 | } | |
2069 | ||
1da177e4 LT |
2070 | default: |
2071 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2072 | ret = -EINVAL; | |
2073 | } | |
2074 | ||
2075 | return ret; | |
2076 | } | |
2077 | ||
35aad0ff JE |
2078 | struct xt_table *ip6t_register_table(struct net *net, |
2079 | const struct xt_table *table, | |
336b517f | 2080 | const struct ip6t_replace *repl) |
1da177e4 LT |
2081 | { |
2082 | int ret; | |
2e4e6a17 | 2083 | struct xt_table_info *newinfo; |
f3c5c1bf | 2084 | struct xt_table_info bootstrap = {0}; |
31836064 | 2085 | void *loc_cpu_entry; |
a98da11d | 2086 | struct xt_table *new_table; |
1da177e4 | 2087 | |
2e4e6a17 | 2088 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2089 | if (!newinfo) { |
2090 | ret = -ENOMEM; | |
2091 | goto out; | |
2092 | } | |
1da177e4 | 2093 | |
9c547959 | 2094 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2095 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2096 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2097 | |
0f234214 | 2098 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2099 | if (ret != 0) |
2100 | goto out_free; | |
1da177e4 | 2101 | |
336b517f | 2102 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2103 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2104 | ret = PTR_ERR(new_table); |
2105 | goto out_free; | |
1da177e4 | 2106 | } |
44d34e72 | 2107 | return new_table; |
1da177e4 | 2108 | |
44d34e72 AD |
2109 | out_free: |
2110 | xt_free_table_info(newinfo); | |
2111 | out: | |
2112 | return ERR_PTR(ret); | |
1da177e4 LT |
2113 | } |
2114 | ||
f54e9367 | 2115 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2116 | { |
2e4e6a17 | 2117 | struct xt_table_info *private; |
31836064 | 2118 | void *loc_cpu_entry; |
df200969 | 2119 | struct module *table_owner = table->me; |
72b2b1dd | 2120 | struct ip6t_entry *iter; |
31836064 | 2121 | |
2e4e6a17 | 2122 | private = xt_unregister_table(table); |
1da177e4 LT |
2123 | |
2124 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2125 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2126 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2127 | cleanup_entry(iter, net); |
df200969 AD |
2128 | if (private->number > private->initial_entries) |
2129 | module_put(table_owner); | |
2e4e6a17 | 2130 | xt_free_table_info(private); |
1da177e4 LT |
2131 | } |
2132 | ||
2133 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2134 | static inline bool |
1da177e4 LT |
2135 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2136 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2137 | bool invert) |
1da177e4 LT |
2138 | { |
2139 | return (type == test_type && code >= min_code && code <= max_code) | |
2140 | ^ invert; | |
2141 | } | |
2142 | ||
1d93a9cb | 2143 | static bool |
62fc8051 | 2144 | icmp6_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2145 | { |
5452e425 JE |
2146 | const struct icmp6hdr *ic; |
2147 | struct icmp6hdr _icmph; | |
f7108a20 | 2148 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2149 | |
2150 | /* Must not be a fragment. */ | |
f7108a20 | 2151 | if (par->fragoff != 0) |
1d93a9cb | 2152 | return false; |
1da177e4 | 2153 | |
f7108a20 | 2154 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2155 | if (ic == NULL) { |
2156 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2157 | * can't. Hence, no choice but to drop. |
2158 | */ | |
1da177e4 | 2159 | duprintf("Dropping evil ICMP tinygram.\n"); |
b4ba2611 | 2160 | par->hotdrop = true; |
1d93a9cb | 2161 | return false; |
1da177e4 LT |
2162 | } |
2163 | ||
2164 | return icmp6_type_code_match(icmpinfo->type, | |
2165 | icmpinfo->code[0], | |
2166 | icmpinfo->code[1], | |
2167 | ic->icmp6_type, ic->icmp6_code, | |
2168 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2169 | } | |
2170 | ||
2171 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 2172 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2173 | { |
9b4fce7a | 2174 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2175 | |
7f939713 | 2176 | /* Must specify no unknown invflags */ |
bd414ee6 | 2177 | return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2178 | } |
2179 | ||
2180 | /* The built-in targets: standard (NULL) and error. */ | |
4538506b JE |
2181 | static struct xt_target ip6t_builtin_tg[] __read_mostly = { |
2182 | { | |
243bf6e2 | 2183 | .name = XT_STANDARD_TARGET, |
4538506b JE |
2184 | .targetsize = sizeof(int), |
2185 | .family = NFPROTO_IPV6, | |
3bc3fe5e | 2186 | #ifdef CONFIG_COMPAT |
4538506b JE |
2187 | .compatsize = sizeof(compat_int_t), |
2188 | .compat_from_user = compat_standard_from_user, | |
2189 | .compat_to_user = compat_standard_to_user, | |
3bc3fe5e | 2190 | #endif |
4538506b JE |
2191 | }, |
2192 | { | |
243bf6e2 | 2193 | .name = XT_ERROR_TARGET, |
4538506b | 2194 | .target = ip6t_error, |
12b00c2c | 2195 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
2196 | .family = NFPROTO_IPV6, |
2197 | }, | |
1da177e4 LT |
2198 | }; |
2199 | ||
2200 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2201 | .pf = PF_INET6, | |
2202 | .set_optmin = IP6T_BASE_CTL, | |
2203 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2204 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2205 | #ifdef CONFIG_COMPAT |
2206 | .compat_set = compat_do_ip6t_set_ctl, | |
2207 | #endif | |
1da177e4 LT |
2208 | .get_optmin = IP6T_BASE_CTL, |
2209 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2210 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2211 | #ifdef CONFIG_COMPAT |
2212 | .compat_get = compat_do_ip6t_get_ctl, | |
2213 | #endif | |
16fcec35 | 2214 | .owner = THIS_MODULE, |
1da177e4 LT |
2215 | }; |
2216 | ||
4538506b JE |
2217 | static struct xt_match ip6t_builtin_mt[] __read_mostly = { |
2218 | { | |
2219 | .name = "icmp6", | |
2220 | .match = icmp6_match, | |
2221 | .matchsize = sizeof(struct ip6t_icmp), | |
2222 | .checkentry = icmp6_checkentry, | |
2223 | .proto = IPPROTO_ICMPV6, | |
2224 | .family = NFPROTO_IPV6, | |
2225 | }, | |
1da177e4 LT |
2226 | }; |
2227 | ||
3cb609d5 AD |
2228 | static int __net_init ip6_tables_net_init(struct net *net) |
2229 | { | |
383ca5b8 | 2230 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2231 | } |
2232 | ||
2233 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2234 | { | |
383ca5b8 | 2235 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2236 | } |
2237 | ||
2238 | static struct pernet_operations ip6_tables_net_ops = { | |
2239 | .init = ip6_tables_net_init, | |
2240 | .exit = ip6_tables_net_exit, | |
2241 | }; | |
2242 | ||
65b4b4e8 | 2243 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2244 | { |
2245 | int ret; | |
2246 | ||
3cb609d5 | 2247 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2248 | if (ret < 0) |
2249 | goto err1; | |
2e4e6a17 | 2250 | |
25985edc | 2251 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 2252 | ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 PM |
2253 | if (ret < 0) |
2254 | goto err2; | |
4538506b | 2255 | ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 PM |
2256 | if (ret < 0) |
2257 | goto err4; | |
1da177e4 LT |
2258 | |
2259 | /* Register setsockopt */ | |
2260 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2261 | if (ret < 0) |
2262 | goto err5; | |
1da177e4 | 2263 | |
ff67e4e4 | 2264 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2265 | return 0; |
0eff66e6 PM |
2266 | |
2267 | err5: | |
4538506b | 2268 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 | 2269 | err4: |
4538506b | 2270 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 | 2271 | err2: |
3cb609d5 | 2272 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2273 | err1: |
2274 | return ret; | |
1da177e4 LT |
2275 | } |
2276 | ||
65b4b4e8 | 2277 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2278 | { |
2279 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2280 | |
4538506b JE |
2281 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
2282 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); | |
3cb609d5 | 2283 | unregister_pernet_subsys(&ip6_tables_net_ops); |
1da177e4 LT |
2284 | } |
2285 | ||
e674d0f3 | 2286 | /* |
b777e0ce PM |
2287 | * find the offset to specified header or the protocol number of last header |
2288 | * if target < 0. "last header" is transport protocol header, ESP, or | |
2289 | * "No next header". | |
2290 | * | |
2291 | * If target header is found, its offset is set in *offset and return protocol | |
2292 | * number. Otherwise, return -1. | |
2293 | * | |
6d381634 PM |
2294 | * If the first fragment doesn't contain the final protocol header or |
2295 | * NEXTHDR_NONE it is considered invalid. | |
2296 | * | |
b777e0ce PM |
2297 | * Note that non-1st fragment is special case that "the protocol number |
2298 | * of last header" is "next header" field in Fragment header. In this case, | |
2299 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
2300 | * isn't NULL. | |
e674d0f3 | 2301 | * |
e674d0f3 | 2302 | */ |
b777e0ce PM |
2303 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
2304 | int target, unsigned short *fragoff) | |
e674d0f3 | 2305 | { |
6b88dd96 | 2306 | unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); |
0660e03f | 2307 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
e674d0f3 YK |
2308 | unsigned int len = skb->len - start; |
2309 | ||
b777e0ce PM |
2310 | if (fragoff) |
2311 | *fragoff = 0; | |
2312 | ||
e674d0f3 YK |
2313 | while (nexthdr != target) { |
2314 | struct ipv6_opt_hdr _hdr, *hp; | |
2315 | unsigned int hdrlen; | |
2316 | ||
b777e0ce PM |
2317 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
2318 | if (target < 0) | |
2319 | break; | |
6d381634 | 2320 | return -ENOENT; |
b777e0ce PM |
2321 | } |
2322 | ||
e674d0f3 YK |
2323 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
2324 | if (hp == NULL) | |
6d381634 | 2325 | return -EBADMSG; |
e674d0f3 | 2326 | if (nexthdr == NEXTHDR_FRAGMENT) { |
e69a4adc AV |
2327 | unsigned short _frag_off; |
2328 | __be16 *fp; | |
e674d0f3 YK |
2329 | fp = skb_header_pointer(skb, |
2330 | start+offsetof(struct frag_hdr, | |
2331 | frag_off), | |
2332 | sizeof(_frag_off), | |
2333 | &_frag_off); | |
2334 | if (fp == NULL) | |
6d381634 | 2335 | return -EBADMSG; |
e674d0f3 | 2336 | |
b777e0ce PM |
2337 | _frag_off = ntohs(*fp) & ~0x7; |
2338 | if (_frag_off) { | |
2339 | if (target < 0 && | |
2340 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
337dde79 | 2341 | hp->nexthdr == NEXTHDR_NONE)) { |
b777e0ce PM |
2342 | if (fragoff) |
2343 | *fragoff = _frag_off; | |
2344 | return hp->nexthdr; | |
2345 | } | |
6d381634 | 2346 | return -ENOENT; |
b777e0ce | 2347 | } |
e674d0f3 YK |
2348 | hdrlen = 8; |
2349 | } else if (nexthdr == NEXTHDR_AUTH) | |
1ab1457c | 2350 | hdrlen = (hp->hdrlen + 2) << 2; |
e674d0f3 | 2351 | else |
1ab1457c | 2352 | hdrlen = ipv6_optlen(hp); |
e674d0f3 YK |
2353 | |
2354 | nexthdr = hp->nexthdr; | |
2355 | len -= hdrlen; | |
2356 | start += hdrlen; | |
2357 | } | |
2358 | ||
2359 | *offset = start; | |
b777e0ce | 2360 | return nexthdr; |
e674d0f3 YK |
2361 | } |
2362 | ||
1da177e4 LT |
2363 | EXPORT_SYMBOL(ip6t_register_table); |
2364 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2365 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2366 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 2367 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 2368 | |
65b4b4e8 AM |
2369 | module_init(ip6_tables_init); |
2370 | module_exit(ip6_tables_fini); |