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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 | /* Check for an extension */ |
1ab1457c | 82 | int |
1da177e4 LT |
83 | ip6t_ext_hdr(u8 nexthdr) |
84 | { | |
1ab1457c YH |
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 | ||
d5d1baa1 JE |
218 | static inline const struct ip6t_entry_target * |
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 | { |
d5d1baa1 | 263 | const struct ip6t_standard_target *t = (void *)ip6t_get_target_c(s); |
ba9dda3a JK |
264 | |
265 | if (strcmp(t->target.u.kernel.target->name, IP6T_ERROR_TARGET) == 0) { | |
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, | |
274 | IP6T_STANDARD_TARGET) == 0 && | |
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 { |
d5d1baa1 | 372 | const struct ip6t_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 | ||
406 | v = ((struct ip6t_standard_target *)t)->verdict; | |
407 | if (v < 0) { | |
408 | /* Pop from stack? */ | |
409 | if (v != IP6T_RETURN) { | |
410 | verdict = (unsigned)(-v) - 1; | |
411 | break; | |
1da177e4 | 412 | } |
f3c5c1bf JE |
413 | if (*stackptr == 0) |
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); |
7a6b1c46 JE |
437 | if (verdict == IP6T_CONTINUE) |
438 | e = ip6t_next_entry(e); | |
439 | else | |
440 | /* Verdict */ | |
441 | break; | |
b4ba2611 | 442 | } while (!acpar.hotdrop); |
1da177e4 | 443 | |
942e4a2b | 444 | xt_info_rdunlock_bh(); |
f3c5c1bf | 445 | *stackptr = origptr; |
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 (;;) { | |
d5d1baa1 JE |
477 | const struct ip6t_standard_target *t |
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, | |
491 | IP6T_STANDARD_TARGET) == 0) && | |
492 | t->verdict < 0 && | |
493 | unconditional(&e->ipv6)) || visited) { | |
1da177e4 LT |
494 | unsigned int oldpos, size; |
495 | ||
1f9352ae PM |
496 | if ((strcmp(t->target.u.user.name, |
497 | IP6T_STANDARD_TARGET) == 0) && | |
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, | |
3666ed1c JP |
540 | IP6T_STANDARD_TARGET) == 0 && |
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 | ||
6bdb331b | 568 | static void cleanup_match(struct ip6t_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 | { |
d5d1baa1 | 584 | const struct ip6t_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 | ||
591 | if (e->target_offset + sizeof(struct ip6t_entry_target) > | |
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 | ||
6bdb331b | 602 | static int check_match(struct ip6t_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 |
6bdb331b | 621 | find_check_match(struct ip6t_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 | { |
af5d6dc2 JE |
646 | struct ip6t_entry_target *t = ip6t_get_target(e); |
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 PM |
672 | { |
673 | struct ip6t_entry_target *t; | |
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 JE |
723 | { |
724 | const struct ip6t_entry_target *t; | |
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; | |
732 | verdict = ((struct ip6t_standard_target *)t)->verdict; | |
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 | |
755 | < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) { | |
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; |
1da177e4 | 787 | struct ip6t_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; | |
24b36f01 | 900 | unsigned int curcpu = get_cpu(); |
31836064 ED |
901 | |
902 | /* Instead of clearing (by a previous call to memset()) | |
903 | * the counters and using adds, we set the counters | |
904 | * with data used by 'current' CPU | |
942e4a2b SH |
905 | * |
906 | * Bottom half has to be disabled to prevent deadlock | |
907 | * if new softirq were to run and call ipt_do_table | |
31836064 | 908 | */ |
942e4a2b | 909 | local_bh_disable(); |
31836064 | 910 | i = 0; |
0559518b JE |
911 | xt_entry_foreach(iter, t->entries[curcpu], t->size) { |
912 | SET_COUNTER(counters[i], iter->counters.bcnt, | |
6b4ff2d7 | 913 | iter->counters.pcnt); |
0559518b JE |
914 | ++i; |
915 | } | |
24b36f01 ED |
916 | local_bh_enable(); |
917 | /* Processing counters from other cpus, we can let bottom half enabled, | |
918 | * (preemption is disabled) | |
919 | */ | |
1da177e4 | 920 | |
6f912042 | 921 | for_each_possible_cpu(cpu) { |
31836064 ED |
922 | if (cpu == curcpu) |
923 | continue; | |
1da177e4 | 924 | i = 0; |
001389b9 | 925 | local_bh_disable(); |
942e4a2b | 926 | xt_info_wrlock(cpu); |
0559518b JE |
927 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
928 | ADD_COUNTER(counters[i], iter->counters.bcnt, | |
6b4ff2d7 | 929 | iter->counters.pcnt); |
0559518b JE |
930 | ++i; |
931 | } | |
942e4a2b | 932 | xt_info_wrunlock(cpu); |
001389b9 | 933 | local_bh_enable(); |
1da177e4 | 934 | } |
24b36f01 | 935 | put_cpu(); |
78454473 SH |
936 | } |
937 | ||
d5d1baa1 | 938 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 939 | { |
ed1a6f5e | 940 | unsigned int countersize; |
2e4e6a17 | 941 | struct xt_counters *counters; |
d5d1baa1 | 942 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
943 | |
944 | /* We need atomic snapshot of counters: rest doesn't change | |
945 | (other than comefrom, which userspace doesn't care | |
946 | about). */ | |
2e4e6a17 | 947 | countersize = sizeof(struct xt_counters) * private->number; |
e12f8e29 | 948 | counters = vmalloc(countersize); |
1da177e4 LT |
949 | |
950 | if (counters == NULL) | |
942e4a2b | 951 | return ERR_PTR(-ENOMEM); |
78454473 | 952 | |
942e4a2b | 953 | get_counters(private, counters); |
78454473 | 954 | |
49a88d18 | 955 | return counters; |
ed1a6f5e PM |
956 | } |
957 | ||
958 | static int | |
959 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 960 | const struct xt_table *table, |
ed1a6f5e PM |
961 | void __user *userptr) |
962 | { | |
963 | unsigned int off, num; | |
d5d1baa1 | 964 | const struct ip6t_entry *e; |
ed1a6f5e | 965 | struct xt_counters *counters; |
5452e425 | 966 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 967 | int ret = 0; |
5452e425 | 968 | const void *loc_cpu_entry; |
ed1a6f5e PM |
969 | |
970 | counters = alloc_counters(table); | |
971 | if (IS_ERR(counters)) | |
972 | return PTR_ERR(counters); | |
973 | ||
9c547959 PM |
974 | /* choose the copy that is on our node/cpu, ... |
975 | * This choice is lazy (because current thread is | |
976 | * allowed to migrate to another cpu) | |
977 | */ | |
2e4e6a17 | 978 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 979 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
980 | ret = -EFAULT; |
981 | goto free_counters; | |
982 | } | |
983 | ||
984 | /* FIXME: use iterator macros --RR */ | |
985 | /* ... then go back and fix counters and names */ | |
986 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
987 | unsigned int i; | |
5452e425 JE |
988 | const struct ip6t_entry_match *m; |
989 | const struct ip6t_entry_target *t; | |
1da177e4 | 990 | |
31836064 | 991 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
992 | if (copy_to_user(userptr + off |
993 | + offsetof(struct ip6t_entry, counters), | |
994 | &counters[num], | |
995 | sizeof(counters[num])) != 0) { | |
996 | ret = -EFAULT; | |
997 | goto free_counters; | |
998 | } | |
999 | ||
1000 | for (i = sizeof(struct ip6t_entry); | |
1001 | i < e->target_offset; | |
1002 | i += m->u.match_size) { | |
1003 | m = (void *)e + i; | |
1004 | ||
1005 | if (copy_to_user(userptr + off + i | |
1006 | + offsetof(struct ip6t_entry_match, | |
1007 | u.user.name), | |
1008 | m->u.kernel.match->name, | |
1009 | strlen(m->u.kernel.match->name)+1) | |
1010 | != 0) { | |
1011 | ret = -EFAULT; | |
1012 | goto free_counters; | |
1013 | } | |
1014 | } | |
1015 | ||
d5d1baa1 | 1016 | t = ip6t_get_target_c(e); |
1da177e4 LT |
1017 | if (copy_to_user(userptr + off + e->target_offset |
1018 | + offsetof(struct ip6t_entry_target, | |
1019 | u.user.name), | |
1020 | t->u.kernel.target->name, | |
1021 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1022 | ret = -EFAULT; | |
1023 | goto free_counters; | |
1024 | } | |
1025 | } | |
1026 | ||
1027 | free_counters: | |
1028 | vfree(counters); | |
1029 | return ret; | |
1030 | } | |
1031 | ||
3bc3fe5e | 1032 | #ifdef CONFIG_COMPAT |
739674fb | 1033 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
1034 | { |
1035 | int v = *(compat_int_t *)src; | |
1036 | ||
1037 | if (v > 0) | |
1038 | v += xt_compat_calc_jump(AF_INET6, v); | |
1039 | memcpy(dst, &v, sizeof(v)); | |
1040 | } | |
1041 | ||
739674fb | 1042 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
1043 | { |
1044 | compat_int_t cv = *(int *)src; | |
1045 | ||
1046 | if (cv > 0) | |
1047 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1048 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1049 | } | |
1050 | ||
d5d1baa1 | 1051 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 1052 | const struct xt_table_info *info, |
d5d1baa1 | 1053 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 1054 | { |
dcea992a | 1055 | const struct xt_entry_match *ematch; |
d5d1baa1 | 1056 | const struct ip6t_entry_target *t; |
3bc3fe5e PM |
1057 | unsigned int entry_offset; |
1058 | int off, i, ret; | |
1059 | ||
1060 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1061 | entry_offset = (void *)e - base; | |
dcea992a | 1062 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1063 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1064 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
1065 | off += xt_compat_target_offset(t->u.kernel.target); |
1066 | newinfo->size -= off; | |
1067 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1068 | if (ret) | |
1069 | return ret; | |
1070 | ||
1071 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1072 | if (info->hook_entry[i] && | |
1073 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1074 | newinfo->hook_entry[i] -= off; | |
1075 | if (info->underflow[i] && | |
1076 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1077 | newinfo->underflow[i] -= off; | |
1078 | } | |
1079 | return 0; | |
1080 | } | |
1081 | ||
1082 | static int compat_table_info(const struct xt_table_info *info, | |
1083 | struct xt_table_info *newinfo) | |
1084 | { | |
72b2b1dd | 1085 | struct ip6t_entry *iter; |
3bc3fe5e | 1086 | void *loc_cpu_entry; |
0559518b | 1087 | int ret; |
3bc3fe5e PM |
1088 | |
1089 | if (!newinfo || !info) | |
1090 | return -EINVAL; | |
1091 | ||
1092 | /* we dont care about newinfo->entries[] */ | |
1093 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1094 | newinfo->initial_entries = 0; | |
1095 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
72b2b1dd JE |
1096 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1097 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1098 | if (ret != 0) | |
0559518b | 1099 | return ret; |
72b2b1dd | 1100 | } |
0559518b | 1101 | return 0; |
3bc3fe5e PM |
1102 | } |
1103 | #endif | |
1104 | ||
d5d1baa1 JE |
1105 | static int get_info(struct net *net, void __user *user, |
1106 | const int *len, int compat) | |
433665c9 PM |
1107 | { |
1108 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1109 | struct xt_table *t; | |
1110 | int ret; | |
1111 | ||
1112 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1113 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1114 | sizeof(struct ip6t_getinfo)); |
1115 | return -EINVAL; | |
1116 | } | |
1117 | ||
1118 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1119 | return -EFAULT; | |
1120 | ||
1121 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; | |
3bc3fe5e PM |
1122 | #ifdef CONFIG_COMPAT |
1123 | if (compat) | |
1124 | xt_compat_lock(AF_INET6); | |
1125 | #endif | |
336b517f | 1126 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 PM |
1127 | "ip6table_%s", name); |
1128 | if (t && !IS_ERR(t)) { | |
1129 | struct ip6t_getinfo info; | |
5452e425 | 1130 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1131 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1132 | struct xt_table_info tmp; |
1133 | ||
3bc3fe5e | 1134 | if (compat) { |
3bc3fe5e PM |
1135 | ret = compat_table_info(private, &tmp); |
1136 | xt_compat_flush_offsets(AF_INET6); | |
1137 | private = &tmp; | |
1138 | } | |
1139 | #endif | |
433665c9 PM |
1140 | info.valid_hooks = t->valid_hooks; |
1141 | memcpy(info.hook_entry, private->hook_entry, | |
1142 | sizeof(info.hook_entry)); | |
1143 | memcpy(info.underflow, private->underflow, | |
1144 | sizeof(info.underflow)); | |
1145 | info.num_entries = private->number; | |
1146 | info.size = private->size; | |
b5dd674b | 1147 | strcpy(info.name, name); |
433665c9 PM |
1148 | |
1149 | if (copy_to_user(user, &info, *len) != 0) | |
1150 | ret = -EFAULT; | |
1151 | else | |
1152 | ret = 0; | |
1153 | ||
1154 | xt_table_unlock(t); | |
1155 | module_put(t->me); | |
1156 | } else | |
1157 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1158 | #ifdef CONFIG_COMPAT |
1159 | if (compat) | |
1160 | xt_compat_unlock(AF_INET6); | |
1161 | #endif | |
433665c9 PM |
1162 | return ret; |
1163 | } | |
1164 | ||
1da177e4 | 1165 | static int |
d5d1baa1 JE |
1166 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
1167 | const int *len) | |
1da177e4 LT |
1168 | { |
1169 | int ret; | |
d924357c | 1170 | struct ip6t_get_entries get; |
2e4e6a17 | 1171 | struct xt_table *t; |
1da177e4 | 1172 | |
d924357c | 1173 | if (*len < sizeof(get)) { |
c9d8fe13 | 1174 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1175 | return -EINVAL; |
1176 | } | |
1177 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1178 | return -EFAULT; | |
1179 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1180 | duprintf("get_entries: %u != %zu\n", |
1181 | *len, sizeof(get) + get.size); | |
d924357c PM |
1182 | return -EINVAL; |
1183 | } | |
1184 | ||
336b517f | 1185 | t = xt_find_table_lock(net, AF_INET6, get.name); |
6b7d31fc | 1186 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
1187 | struct xt_table_info *private = t->private; |
1188 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1189 | if (get.size == private->size) |
2e4e6a17 | 1190 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1191 | t, uptr->entrytable); |
1192 | else { | |
1193 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1194 | private->size, get.size); |
544473c1 | 1195 | ret = -EAGAIN; |
1da177e4 | 1196 | } |
6b7d31fc | 1197 | module_put(t->me); |
2e4e6a17 | 1198 | xt_table_unlock(t); |
1da177e4 | 1199 | } else |
6b7d31fc | 1200 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1201 | |
1202 | return ret; | |
1203 | } | |
1204 | ||
1205 | static int | |
336b517f | 1206 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1207 | struct xt_table_info *newinfo, unsigned int num_counters, |
1208 | void __user *counters_ptr) | |
1da177e4 LT |
1209 | { |
1210 | int ret; | |
2e4e6a17 | 1211 | struct xt_table *t; |
3bc3fe5e | 1212 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1213 | struct xt_counters *counters; |
5452e425 | 1214 | const void *loc_cpu_old_entry; |
72b2b1dd | 1215 | struct ip6t_entry *iter; |
1da177e4 | 1216 | |
3bc3fe5e | 1217 | ret = 0; |
e12f8e29 | 1218 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); |
1da177e4 LT |
1219 | if (!counters) { |
1220 | ret = -ENOMEM; | |
3bc3fe5e | 1221 | goto out; |
1da177e4 | 1222 | } |
1da177e4 | 1223 | |
336b517f | 1224 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1225 | "ip6table_%s", name); |
6b7d31fc HW |
1226 | if (!t || IS_ERR(t)) { |
1227 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1228 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1229 | } |
1da177e4 LT |
1230 | |
1231 | /* You lied! */ | |
3bc3fe5e | 1232 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1233 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1234 | valid_hooks, t->valid_hooks); |
1da177e4 | 1235 | ret = -EINVAL; |
6b7d31fc | 1236 | goto put_module; |
1da177e4 LT |
1237 | } |
1238 | ||
3bc3fe5e | 1239 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1240 | if (!oldinfo) |
1241 | goto put_module; | |
1242 | ||
1243 | /* Update module usage count based on number of rules */ | |
1244 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1245 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1246 | if ((oldinfo->number > oldinfo->initial_entries) || |
1247 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1248 | module_put(t->me); |
1249 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1250 | (newinfo->number <= oldinfo->initial_entries)) | |
1251 | module_put(t->me); | |
1252 | ||
942e4a2b | 1253 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1254 | get_counters(oldinfo, counters); |
942e4a2b | 1255 | |
1da177e4 | 1256 | /* Decrease module usage counts and free resource */ |
31836064 | 1257 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
72b2b1dd | 1258 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1259 | cleanup_entry(iter, net); |
72b2b1dd | 1260 | |
2e4e6a17 | 1261 | xt_free_table_info(oldinfo); |
3bc3fe5e PM |
1262 | if (copy_to_user(counters_ptr, counters, |
1263 | sizeof(struct xt_counters) * num_counters) != 0) | |
1da177e4 LT |
1264 | ret = -EFAULT; |
1265 | vfree(counters); | |
2e4e6a17 | 1266 | xt_table_unlock(t); |
1da177e4 LT |
1267 | return ret; |
1268 | ||
1269 | put_module: | |
1270 | module_put(t->me); | |
2e4e6a17 | 1271 | xt_table_unlock(t); |
1da177e4 | 1272 | free_newinfo_counters_untrans: |
1da177e4 | 1273 | vfree(counters); |
3bc3fe5e PM |
1274 | out: |
1275 | return ret; | |
1276 | } | |
1277 | ||
1278 | static int | |
d5d1baa1 | 1279 | do_replace(struct net *net, const void __user *user, unsigned int len) |
3bc3fe5e PM |
1280 | { |
1281 | int ret; | |
1282 | struct ip6t_replace tmp; | |
1283 | struct xt_table_info *newinfo; | |
1284 | void *loc_cpu_entry; | |
72b2b1dd | 1285 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1286 | |
1287 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1288 | return -EFAULT; | |
1289 | ||
1290 | /* overflow check */ | |
1291 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1292 | return -ENOMEM; | |
1293 | ||
1294 | newinfo = xt_alloc_table_info(tmp.size); | |
1295 | if (!newinfo) | |
1296 | return -ENOMEM; | |
1297 | ||
1298 | /* choose the copy that is on our node/cpu */ | |
1299 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1300 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1301 | tmp.size) != 0) { | |
1302 | ret = -EFAULT; | |
1303 | goto free_newinfo; | |
1304 | } | |
1305 | ||
0f234214 | 1306 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1307 | if (ret != 0) |
1308 | goto free_newinfo; | |
1309 | ||
1310 | duprintf("ip_tables: Translated table\n"); | |
1311 | ||
336b517f | 1312 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1313 | tmp.num_counters, tmp.counters); |
1314 | if (ret) | |
1315 | goto free_newinfo_untrans; | |
1316 | return 0; | |
1317 | ||
1318 | free_newinfo_untrans: | |
72b2b1dd | 1319 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1320 | cleanup_entry(iter, net); |
1da177e4 | 1321 | free_newinfo: |
2e4e6a17 | 1322 | xt_free_table_info(newinfo); |
1da177e4 LT |
1323 | return ret; |
1324 | } | |
1325 | ||
1da177e4 | 1326 | static int |
d5d1baa1 | 1327 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
336b517f | 1328 | int compat) |
1da177e4 | 1329 | { |
942e4a2b | 1330 | unsigned int i, curcpu; |
3bc3fe5e PM |
1331 | struct xt_counters_info tmp; |
1332 | struct xt_counters *paddc; | |
1333 | unsigned int num_counters; | |
1334 | char *name; | |
1335 | int size; | |
1336 | void *ptmp; | |
2e4e6a17 | 1337 | struct xt_table *t; |
5452e425 | 1338 | const struct xt_table_info *private; |
6b7d31fc | 1339 | int ret = 0; |
5452e425 | 1340 | const void *loc_cpu_entry; |
72b2b1dd | 1341 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1342 | #ifdef CONFIG_COMPAT |
1343 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1344 | |
3bc3fe5e PM |
1345 | if (compat) { |
1346 | ptmp = &compat_tmp; | |
1347 | size = sizeof(struct compat_xt_counters_info); | |
1348 | } else | |
1349 | #endif | |
1350 | { | |
1351 | ptmp = &tmp; | |
1352 | size = sizeof(struct xt_counters_info); | |
1353 | } | |
1354 | ||
1355 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1356 | return -EFAULT; |
1357 | ||
3bc3fe5e PM |
1358 | #ifdef CONFIG_COMPAT |
1359 | if (compat) { | |
1360 | num_counters = compat_tmp.num_counters; | |
1361 | name = compat_tmp.name; | |
1362 | } else | |
1363 | #endif | |
1364 | { | |
1365 | num_counters = tmp.num_counters; | |
1366 | name = tmp.name; | |
1367 | } | |
1368 | ||
1369 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1370 | return -EINVAL; |
1371 | ||
e12f8e29 | 1372 | paddc = vmalloc(len - size); |
1da177e4 LT |
1373 | if (!paddc) |
1374 | return -ENOMEM; | |
1375 | ||
3bc3fe5e | 1376 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1377 | ret = -EFAULT; |
1378 | goto free; | |
1379 | } | |
1380 | ||
336b517f | 1381 | t = xt_find_table_lock(net, AF_INET6, name); |
6b7d31fc HW |
1382 | if (!t || IS_ERR(t)) { |
1383 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1384 | goto free; |
6b7d31fc | 1385 | } |
1da177e4 | 1386 | |
942e4a2b SH |
1387 | |
1388 | local_bh_disable(); | |
2e4e6a17 | 1389 | private = t->private; |
3bc3fe5e | 1390 | if (private->number != num_counters) { |
1da177e4 LT |
1391 | ret = -EINVAL; |
1392 | goto unlock_up_free; | |
1393 | } | |
1394 | ||
1395 | i = 0; | |
31836064 | 1396 | /* Choose the copy that is on our node */ |
942e4a2b SH |
1397 | curcpu = smp_processor_id(); |
1398 | xt_info_wrlock(curcpu); | |
1399 | loc_cpu_entry = private->entries[curcpu]; | |
0559518b JE |
1400 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1401 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1402 | ++i; | |
1403 | } | |
942e4a2b SH |
1404 | xt_info_wrunlock(curcpu); |
1405 | ||
1da177e4 | 1406 | unlock_up_free: |
942e4a2b | 1407 | local_bh_enable(); |
2e4e6a17 | 1408 | xt_table_unlock(t); |
6b7d31fc | 1409 | module_put(t->me); |
1da177e4 LT |
1410 | free: |
1411 | vfree(paddc); | |
1412 | ||
1413 | return ret; | |
1414 | } | |
1415 | ||
3bc3fe5e PM |
1416 | #ifdef CONFIG_COMPAT |
1417 | struct compat_ip6t_replace { | |
1418 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1419 | u32 valid_hooks; | |
1420 | u32 num_entries; | |
1421 | u32 size; | |
1422 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1423 | u32 underflow[NF_INET_NUMHOOKS]; | |
1424 | u32 num_counters; | |
1425 | compat_uptr_t counters; /* struct ip6t_counters * */ | |
1426 | struct compat_ip6t_entry entries[0]; | |
1427 | }; | |
1428 | ||
1429 | static int | |
1430 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1431 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1432 | unsigned int i) |
3bc3fe5e PM |
1433 | { |
1434 | struct ip6t_entry_target *t; | |
1435 | struct compat_ip6t_entry __user *ce; | |
1436 | u_int16_t target_offset, next_offset; | |
1437 | compat_uint_t origsize; | |
dcea992a JE |
1438 | const struct xt_entry_match *ematch; |
1439 | int ret = 0; | |
3bc3fe5e | 1440 | |
3bc3fe5e PM |
1441 | origsize = *size; |
1442 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
0559518b JE |
1443 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1444 | copy_to_user(&ce->counters, &counters[i], | |
1445 | sizeof(counters[i])) != 0) | |
1446 | return -EFAULT; | |
3bc3fe5e PM |
1447 | |
1448 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1449 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1450 | ||
dcea992a JE |
1451 | xt_ematch_foreach(ematch, e) { |
1452 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1453 | if (ret != 0) | |
6bdb331b | 1454 | return ret; |
dcea992a | 1455 | } |
3bc3fe5e | 1456 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1457 | t = ip6t_get_target(e); |
1458 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1459 | if (ret) | |
0559518b | 1460 | return ret; |
3bc3fe5e | 1461 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1462 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1463 | put_user(next_offset, &ce->next_offset) != 0) | |
1464 | return -EFAULT; | |
3bc3fe5e | 1465 | return 0; |
3bc3fe5e PM |
1466 | } |
1467 | ||
022748a9 | 1468 | static int |
3bc3fe5e PM |
1469 | compat_find_calc_match(struct ip6t_entry_match *m, |
1470 | const char *name, | |
1471 | const struct ip6t_ip6 *ipv6, | |
1472 | unsigned int hookmask, | |
6bdb331b | 1473 | int *size) |
3bc3fe5e PM |
1474 | { |
1475 | struct xt_match *match; | |
1476 | ||
fd0ec0e6 JE |
1477 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
1478 | m->u.user.revision); | |
1479 | if (IS_ERR(match)) { | |
3bc3fe5e PM |
1480 | duprintf("compat_check_calc_match: `%s' not found\n", |
1481 | m->u.user.name); | |
fd0ec0e6 | 1482 | return PTR_ERR(match); |
3bc3fe5e PM |
1483 | } |
1484 | m->u.kernel.match = match; | |
1485 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1486 | return 0; |
1487 | } | |
1488 | ||
0559518b | 1489 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e PM |
1490 | { |
1491 | struct ip6t_entry_target *t; | |
dcea992a | 1492 | struct xt_entry_match *ematch; |
3bc3fe5e | 1493 | |
3bc3fe5e | 1494 | /* Cleanup all matches */ |
dcea992a | 1495 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1496 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1497 | t = compat_ip6t_get_target(e); |
1498 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1499 | } |
1500 | ||
022748a9 | 1501 | static int |
3bc3fe5e PM |
1502 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1503 | struct xt_table_info *newinfo, | |
1504 | unsigned int *size, | |
d5d1baa1 JE |
1505 | const unsigned char *base, |
1506 | const unsigned char *limit, | |
1507 | const unsigned int *hook_entries, | |
1508 | const unsigned int *underflows, | |
3bc3fe5e PM |
1509 | const char *name) |
1510 | { | |
dcea992a | 1511 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1512 | struct ip6t_entry_target *t; |
1513 | struct xt_target *target; | |
1514 | unsigned int entry_offset; | |
b0a6363c PM |
1515 | unsigned int j; |
1516 | int ret, off, h; | |
3bc3fe5e PM |
1517 | |
1518 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1519 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
1520 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
3bc3fe5e PM |
1521 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1522 | return -EINVAL; | |
1523 | } | |
1524 | ||
1525 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1526 | sizeof(struct compat_xt_entry_target)) { | |
1527 | duprintf("checking: element %p size %u\n", | |
1528 | e, e->next_offset); | |
1529 | return -EINVAL; | |
1530 | } | |
1531 | ||
1532 | /* For purposes of check_entry casting the compat entry is fine */ | |
1533 | ret = check_entry((struct ip6t_entry *)e, name); | |
1534 | if (ret) | |
1535 | return ret; | |
1536 | ||
1537 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1538 | entry_offset = (void *)e - (void *)base; | |
1539 | j = 0; | |
dcea992a JE |
1540 | xt_ematch_foreach(ematch, e) { |
1541 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1542 | &e->ipv6, e->comefrom, &off); |
dcea992a | 1543 | if (ret != 0) |
6bdb331b JE |
1544 | goto release_matches; |
1545 | ++j; | |
dcea992a | 1546 | } |
3bc3fe5e PM |
1547 | |
1548 | t = compat_ip6t_get_target(e); | |
d2a7b6ba JE |
1549 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
1550 | t->u.user.revision); | |
1551 | if (IS_ERR(target)) { | |
3bc3fe5e PM |
1552 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
1553 | t->u.user.name); | |
d2a7b6ba | 1554 | ret = PTR_ERR(target); |
3bc3fe5e PM |
1555 | goto release_matches; |
1556 | } | |
1557 | t->u.kernel.target = target; | |
1558 | ||
1559 | off += xt_compat_target_offset(target); | |
1560 | *size += off; | |
1561 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1562 | if (ret) | |
1563 | goto out; | |
1564 | ||
1565 | /* Check hooks & underflows */ | |
1566 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1567 | if ((unsigned char *)e - base == hook_entries[h]) | |
1568 | newinfo->hook_entry[h] = hook_entries[h]; | |
1569 | if ((unsigned char *)e - base == underflows[h]) | |
1570 | newinfo->underflow[h] = underflows[h]; | |
1571 | } | |
1572 | ||
1573 | /* Clear counters and comefrom */ | |
1574 | memset(&e->counters, 0, sizeof(e->counters)); | |
1575 | e->comefrom = 0; | |
3bc3fe5e PM |
1576 | return 0; |
1577 | ||
1578 | out: | |
1579 | module_put(t->u.kernel.target->me); | |
1580 | release_matches: | |
6bdb331b JE |
1581 | xt_ematch_foreach(ematch, e) { |
1582 | if (j-- == 0) | |
dcea992a | 1583 | break; |
6bdb331b JE |
1584 | module_put(ematch->u.kernel.match->me); |
1585 | } | |
3bc3fe5e PM |
1586 | return ret; |
1587 | } | |
1588 | ||
1589 | static int | |
1590 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1591 | unsigned int *size, const char *name, | |
1592 | struct xt_table_info *newinfo, unsigned char *base) | |
1593 | { | |
1594 | struct ip6t_entry_target *t; | |
1595 | struct xt_target *target; | |
1596 | struct ip6t_entry *de; | |
1597 | unsigned int origsize; | |
1598 | int ret, h; | |
dcea992a | 1599 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1600 | |
1601 | ret = 0; | |
1602 | origsize = *size; | |
1603 | de = (struct ip6t_entry *)*dstptr; | |
1604 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1605 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1606 | ||
1607 | *dstptr += sizeof(struct ip6t_entry); | |
1608 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1609 | ||
dcea992a JE |
1610 | xt_ematch_foreach(ematch, e) { |
1611 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1612 | if (ret != 0) | |
6bdb331b | 1613 | return ret; |
dcea992a | 1614 | } |
3bc3fe5e PM |
1615 | de->target_offset = e->target_offset - (origsize - *size); |
1616 | t = compat_ip6t_get_target(e); | |
1617 | target = t->u.kernel.target; | |
1618 | xt_compat_target_from_user(t, dstptr, size); | |
1619 | ||
1620 | de->next_offset = e->next_offset - (origsize - *size); | |
1621 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1622 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1623 | newinfo->hook_entry[h] -= origsize - *size; | |
1624 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1625 | newinfo->underflow[h] -= origsize - *size; | |
1626 | } | |
1627 | return ret; | |
1628 | } | |
1629 | ||
f54e9367 | 1630 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
0559518b | 1631 | const char *name) |
3bc3fe5e | 1632 | { |
b0a6363c | 1633 | unsigned int j; |
dcea992a | 1634 | int ret = 0; |
9b4fce7a | 1635 | struct xt_mtchk_param mtpar; |
dcea992a | 1636 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1637 | |
1638 | j = 0; | |
f54e9367 | 1639 | mtpar.net = net; |
9b4fce7a JE |
1640 | mtpar.table = name; |
1641 | mtpar.entryinfo = &e->ipv6; | |
1642 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1643 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 1644 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1645 | ret = check_match(ematch, &mtpar); |
dcea992a | 1646 | if (ret != 0) |
6bdb331b JE |
1647 | goto cleanup_matches; |
1648 | ++j; | |
dcea992a | 1649 | } |
3bc3fe5e | 1650 | |
add67461 | 1651 | ret = check_target(e, net, name); |
3bc3fe5e PM |
1652 | if (ret) |
1653 | goto cleanup_matches; | |
3bc3fe5e PM |
1654 | return 0; |
1655 | ||
1656 | cleanup_matches: | |
6bdb331b JE |
1657 | xt_ematch_foreach(ematch, e) { |
1658 | if (j-- == 0) | |
dcea992a | 1659 | break; |
6bdb331b JE |
1660 | cleanup_match(ematch, net); |
1661 | } | |
3bc3fe5e PM |
1662 | return ret; |
1663 | } | |
1664 | ||
1665 | static int | |
f54e9367 AD |
1666 | translate_compat_table(struct net *net, |
1667 | const char *name, | |
3bc3fe5e PM |
1668 | unsigned int valid_hooks, |
1669 | struct xt_table_info **pinfo, | |
1670 | void **pentry0, | |
1671 | unsigned int total_size, | |
1672 | unsigned int number, | |
1673 | unsigned int *hook_entries, | |
1674 | unsigned int *underflows) | |
1675 | { | |
1676 | unsigned int i, j; | |
1677 | struct xt_table_info *newinfo, *info; | |
1678 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1679 | struct compat_ip6t_entry *iter0; |
1680 | struct ip6t_entry *iter1; | |
3bc3fe5e | 1681 | unsigned int size; |
72b2b1dd | 1682 | int ret = 0; |
3bc3fe5e PM |
1683 | |
1684 | info = *pinfo; | |
1685 | entry0 = *pentry0; | |
1686 | size = total_size; | |
1687 | info->number = number; | |
1688 | ||
1689 | /* Init all hooks to impossible value. */ | |
1690 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1691 | info->hook_entry[i] = 0xFFFFFFFF; | |
1692 | info->underflow[i] = 0xFFFFFFFF; | |
1693 | } | |
1694 | ||
1695 | duprintf("translate_compat_table: size %u\n", info->size); | |
1696 | j = 0; | |
1697 | xt_compat_lock(AF_INET6); | |
1698 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
1699 | xt_entry_foreach(iter0, entry0, total_size) { |
1700 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1701 | entry0, |
1702 | entry0 + total_size, | |
1703 | hook_entries, | |
1704 | underflows, | |
1705 | name); | |
72b2b1dd | 1706 | if (ret != 0) |
0559518b JE |
1707 | goto out_unlock; |
1708 | ++j; | |
72b2b1dd | 1709 | } |
3bc3fe5e PM |
1710 | |
1711 | ret = -EINVAL; | |
1712 | if (j != number) { | |
1713 | duprintf("translate_compat_table: %u not %u entries\n", | |
1714 | j, number); | |
1715 | goto out_unlock; | |
1716 | } | |
1717 | ||
1718 | /* Check hooks all assigned */ | |
1719 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1720 | /* Only hooks which are valid */ | |
1721 | if (!(valid_hooks & (1 << i))) | |
1722 | continue; | |
1723 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1724 | duprintf("Invalid hook entry %u %u\n", | |
1725 | i, hook_entries[i]); | |
1726 | goto out_unlock; | |
1727 | } | |
1728 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1729 | duprintf("Invalid underflow %u %u\n", | |
1730 | i, underflows[i]); | |
1731 | goto out_unlock; | |
1732 | } | |
1733 | } | |
1734 | ||
1735 | ret = -ENOMEM; | |
1736 | newinfo = xt_alloc_table_info(size); | |
1737 | if (!newinfo) | |
1738 | goto out_unlock; | |
1739 | ||
1740 | newinfo->number = number; | |
1741 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1742 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1743 | newinfo->underflow[i] = info->underflow[i]; | |
1744 | } | |
1745 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1746 | pos = entry1; | |
1747 | size = total_size; | |
72b2b1dd | 1748 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1749 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1750 | name, newinfo, entry1); | |
72b2b1dd JE |
1751 | if (ret != 0) |
1752 | break; | |
1753 | } | |
3bc3fe5e PM |
1754 | xt_compat_flush_offsets(AF_INET6); |
1755 | xt_compat_unlock(AF_INET6); | |
1756 | if (ret) | |
1757 | goto free_newinfo; | |
1758 | ||
1759 | ret = -ELOOP; | |
1760 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1761 | goto free_newinfo; | |
1762 | ||
1763 | i = 0; | |
72b2b1dd | 1764 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1765 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1766 | if (ret != 0) |
1767 | break; | |
0559518b | 1768 | ++i; |
cca77b7c FW |
1769 | if (strcmp(ip6t_get_target(iter1)->u.user.name, |
1770 | XT_ERROR_TARGET) == 0) | |
1771 | ++newinfo->stacksize; | |
72b2b1dd | 1772 | } |
3bc3fe5e | 1773 | if (ret) { |
72b2b1dd JE |
1774 | /* |
1775 | * The first i matches need cleanup_entry (calls ->destroy) | |
1776 | * because they had called ->check already. The other j-i | |
1777 | * entries need only release. | |
1778 | */ | |
1779 | int skip = i; | |
3bc3fe5e | 1780 | j -= i; |
72b2b1dd JE |
1781 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1782 | if (skip-- > 0) | |
1783 | continue; | |
0559518b | 1784 | if (j-- == 0) |
72b2b1dd | 1785 | break; |
0559518b | 1786 | compat_release_entry(iter0); |
72b2b1dd | 1787 | } |
0559518b JE |
1788 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1789 | if (i-- == 0) | |
72b2b1dd | 1790 | break; |
0559518b JE |
1791 | cleanup_entry(iter1, net); |
1792 | } | |
3bc3fe5e PM |
1793 | xt_free_table_info(newinfo); |
1794 | return ret; | |
1795 | } | |
1796 | ||
1797 | /* And one copy for every other CPU */ | |
1798 | for_each_possible_cpu(i) | |
1799 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1800 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1801 | ||
1802 | *pinfo = newinfo; | |
1803 | *pentry0 = entry1; | |
1804 | xt_free_table_info(info); | |
1805 | return 0; | |
1806 | ||
1807 | free_newinfo: | |
1808 | xt_free_table_info(newinfo); | |
1809 | out: | |
0559518b JE |
1810 | xt_entry_foreach(iter0, entry0, total_size) { |
1811 | if (j-- == 0) | |
72b2b1dd | 1812 | break; |
0559518b JE |
1813 | compat_release_entry(iter0); |
1814 | } | |
3bc3fe5e PM |
1815 | return ret; |
1816 | out_unlock: | |
1817 | xt_compat_flush_offsets(AF_INET6); | |
1818 | xt_compat_unlock(AF_INET6); | |
1819 | goto out; | |
1820 | } | |
1821 | ||
1822 | static int | |
336b517f | 1823 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1824 | { |
1825 | int ret; | |
1826 | struct compat_ip6t_replace tmp; | |
1827 | struct xt_table_info *newinfo; | |
1828 | void *loc_cpu_entry; | |
72b2b1dd | 1829 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1830 | |
1831 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1832 | return -EFAULT; | |
1833 | ||
1834 | /* overflow check */ | |
1835 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1836 | return -ENOMEM; | |
1837 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1838 | return -ENOMEM; | |
1839 | ||
1840 | newinfo = xt_alloc_table_info(tmp.size); | |
1841 | if (!newinfo) | |
1842 | return -ENOMEM; | |
1843 | ||
9c547959 | 1844 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1845 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1846 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1847 | tmp.size) != 0) { | |
1848 | ret = -EFAULT; | |
1849 | goto free_newinfo; | |
1850 | } | |
1851 | ||
f54e9367 | 1852 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1853 | &newinfo, &loc_cpu_entry, tmp.size, |
1854 | tmp.num_entries, tmp.hook_entry, | |
1855 | tmp.underflow); | |
1856 | if (ret != 0) | |
1857 | goto free_newinfo; | |
1858 | ||
1859 | duprintf("compat_do_replace: Translated table\n"); | |
1860 | ||
336b517f | 1861 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1862 | tmp.num_counters, compat_ptr(tmp.counters)); |
1863 | if (ret) | |
1864 | goto free_newinfo_untrans; | |
1865 | return 0; | |
1866 | ||
1867 | free_newinfo_untrans: | |
72b2b1dd | 1868 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1869 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1870 | free_newinfo: |
1871 | xt_free_table_info(newinfo); | |
1872 | return ret; | |
1873 | } | |
1874 | ||
1875 | static int | |
1876 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1877 | unsigned int len) | |
1878 | { | |
1879 | int ret; | |
1880 | ||
1881 | if (!capable(CAP_NET_ADMIN)) | |
1882 | return -EPERM; | |
1883 | ||
1884 | switch (cmd) { | |
1885 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1886 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1887 | break; |
1888 | ||
1889 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1890 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1891 | break; |
1892 | ||
1893 | default: | |
1894 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1895 | ret = -EINVAL; | |
1896 | } | |
1897 | ||
1898 | return ret; | |
1899 | } | |
1900 | ||
1901 | struct compat_ip6t_get_entries { | |
1902 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1903 | compat_uint_t size; | |
1904 | struct compat_ip6t_entry entrytable[0]; | |
1905 | }; | |
1906 | ||
1907 | static int | |
1908 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1909 | void __user *userptr) | |
1910 | { | |
1911 | struct xt_counters *counters; | |
5452e425 | 1912 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1913 | void __user *pos; |
1914 | unsigned int size; | |
1915 | int ret = 0; | |
5452e425 | 1916 | const void *loc_cpu_entry; |
3bc3fe5e | 1917 | unsigned int i = 0; |
72b2b1dd | 1918 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1919 | |
1920 | counters = alloc_counters(table); | |
1921 | if (IS_ERR(counters)) | |
1922 | return PTR_ERR(counters); | |
1923 | ||
1924 | /* choose the copy that is on our node/cpu, ... | |
1925 | * This choice is lazy (because current thread is | |
1926 | * allowed to migrate to another cpu) | |
1927 | */ | |
1928 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1929 | pos = userptr; | |
1930 | size = total_size; | |
72b2b1dd JE |
1931 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1932 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1933 | &size, counters, i++); |
72b2b1dd JE |
1934 | if (ret != 0) |
1935 | break; | |
1936 | } | |
3bc3fe5e PM |
1937 | |
1938 | vfree(counters); | |
1939 | return ret; | |
1940 | } | |
1941 | ||
1942 | static int | |
336b517f AD |
1943 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1944 | int *len) | |
3bc3fe5e PM |
1945 | { |
1946 | int ret; | |
1947 | struct compat_ip6t_get_entries get; | |
1948 | struct xt_table *t; | |
1949 | ||
1950 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1951 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1952 | return -EINVAL; |
1953 | } | |
1954 | ||
1955 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1956 | return -EFAULT; | |
1957 | ||
1958 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1959 | duprintf("compat_get_entries: %u != %zu\n", |
1960 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1961 | return -EINVAL; |
1962 | } | |
1963 | ||
1964 | xt_compat_lock(AF_INET6); | |
336b517f | 1965 | t = xt_find_table_lock(net, AF_INET6, get.name); |
3bc3fe5e | 1966 | if (t && !IS_ERR(t)) { |
5452e425 | 1967 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1968 | struct xt_table_info info; |
9c547959 | 1969 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1970 | ret = compat_table_info(private, &info); |
1971 | if (!ret && get.size == info.size) { | |
1972 | ret = compat_copy_entries_to_user(private->size, | |
1973 | t, uptr->entrytable); | |
1974 | } else if (!ret) { | |
1975 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1976 | private->size, get.size); |
544473c1 | 1977 | ret = -EAGAIN; |
3bc3fe5e PM |
1978 | } |
1979 | xt_compat_flush_offsets(AF_INET6); | |
1980 | module_put(t->me); | |
1981 | xt_table_unlock(t); | |
1982 | } else | |
1983 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1984 | ||
1985 | xt_compat_unlock(AF_INET6); | |
1986 | return ret; | |
1987 | } | |
1988 | ||
1989 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
1990 | ||
1991 | static int | |
1992 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1993 | { | |
1994 | int ret; | |
1995 | ||
1996 | if (!capable(CAP_NET_ADMIN)) | |
1997 | return -EPERM; | |
1998 | ||
1999 | switch (cmd) { | |
2000 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 2001 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
2002 | break; |
2003 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 2004 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
2005 | break; |
2006 | default: | |
2007 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
2008 | } | |
2009 | return ret; | |
2010 | } | |
2011 | #endif | |
2012 | ||
1da177e4 LT |
2013 | static int |
2014 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2015 | { | |
2016 | int ret; | |
2017 | ||
2018 | if (!capable(CAP_NET_ADMIN)) | |
2019 | return -EPERM; | |
2020 | ||
2021 | switch (cmd) { | |
2022 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2023 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2024 | break; |
2025 | ||
2026 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2027 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2028 | break; |
2029 | ||
2030 | default: | |
2031 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2032 | ret = -EINVAL; | |
2033 | } | |
2034 | ||
2035 | return ret; | |
2036 | } | |
2037 | ||
2038 | static int | |
2039 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2040 | { | |
2041 | int ret; | |
2042 | ||
2043 | if (!capable(CAP_NET_ADMIN)) | |
2044 | return -EPERM; | |
2045 | ||
2046 | switch (cmd) { | |
433665c9 | 2047 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2048 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2049 | break; |
1da177e4 | 2050 | |
d924357c | 2051 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2052 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2053 | break; |
1da177e4 | 2054 | |
6b7d31fc HW |
2055 | case IP6T_SO_GET_REVISION_MATCH: |
2056 | case IP6T_SO_GET_REVISION_TARGET: { | |
2057 | struct ip6t_get_revision rev; | |
2e4e6a17 | 2058 | int target; |
6b7d31fc HW |
2059 | |
2060 | if (*len != sizeof(rev)) { | |
2061 | ret = -EINVAL; | |
2062 | break; | |
2063 | } | |
2064 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2065 | ret = -EFAULT; | |
2066 | break; | |
2067 | } | |
2068 | ||
2069 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2070 | target = 1; |
6b7d31fc | 2071 | else |
2e4e6a17 | 2072 | target = 0; |
6b7d31fc | 2073 | |
2e4e6a17 HW |
2074 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2075 | rev.revision, | |
2076 | target, &ret), | |
6b7d31fc HW |
2077 | "ip6t_%s", rev.name); |
2078 | break; | |
2079 | } | |
2080 | ||
1da177e4 LT |
2081 | default: |
2082 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2083 | ret = -EINVAL; | |
2084 | } | |
2085 | ||
2086 | return ret; | |
2087 | } | |
2088 | ||
35aad0ff JE |
2089 | struct xt_table *ip6t_register_table(struct net *net, |
2090 | const struct xt_table *table, | |
336b517f | 2091 | const struct ip6t_replace *repl) |
1da177e4 LT |
2092 | { |
2093 | int ret; | |
2e4e6a17 | 2094 | struct xt_table_info *newinfo; |
f3c5c1bf | 2095 | struct xt_table_info bootstrap = {0}; |
31836064 | 2096 | void *loc_cpu_entry; |
a98da11d | 2097 | struct xt_table *new_table; |
1da177e4 | 2098 | |
2e4e6a17 | 2099 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2100 | if (!newinfo) { |
2101 | ret = -ENOMEM; | |
2102 | goto out; | |
2103 | } | |
1da177e4 | 2104 | |
9c547959 | 2105 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2106 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2107 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2108 | |
0f234214 | 2109 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2110 | if (ret != 0) |
2111 | goto out_free; | |
1da177e4 | 2112 | |
336b517f | 2113 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2114 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2115 | ret = PTR_ERR(new_table); |
2116 | goto out_free; | |
1da177e4 | 2117 | } |
44d34e72 | 2118 | return new_table; |
1da177e4 | 2119 | |
44d34e72 AD |
2120 | out_free: |
2121 | xt_free_table_info(newinfo); | |
2122 | out: | |
2123 | return ERR_PTR(ret); | |
1da177e4 LT |
2124 | } |
2125 | ||
f54e9367 | 2126 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2127 | { |
2e4e6a17 | 2128 | struct xt_table_info *private; |
31836064 | 2129 | void *loc_cpu_entry; |
df200969 | 2130 | struct module *table_owner = table->me; |
72b2b1dd | 2131 | struct ip6t_entry *iter; |
31836064 | 2132 | |
2e4e6a17 | 2133 | private = xt_unregister_table(table); |
1da177e4 LT |
2134 | |
2135 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2136 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2137 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2138 | cleanup_entry(iter, net); |
df200969 AD |
2139 | if (private->number > private->initial_entries) |
2140 | module_put(table_owner); | |
2e4e6a17 | 2141 | xt_free_table_info(private); |
1da177e4 LT |
2142 | } |
2143 | ||
2144 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2145 | static inline bool |
1da177e4 LT |
2146 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2147 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2148 | bool invert) |
1da177e4 LT |
2149 | { |
2150 | return (type == test_type && code >= min_code && code <= max_code) | |
2151 | ^ invert; | |
2152 | } | |
2153 | ||
1d93a9cb | 2154 | static bool |
62fc8051 | 2155 | icmp6_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2156 | { |
5452e425 JE |
2157 | const struct icmp6hdr *ic; |
2158 | struct icmp6hdr _icmph; | |
f7108a20 | 2159 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2160 | |
2161 | /* Must not be a fragment. */ | |
f7108a20 | 2162 | if (par->fragoff != 0) |
1d93a9cb | 2163 | return false; |
1da177e4 | 2164 | |
f7108a20 | 2165 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2166 | if (ic == NULL) { |
2167 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2168 | * can't. Hence, no choice but to drop. |
2169 | */ | |
1da177e4 | 2170 | duprintf("Dropping evil ICMP tinygram.\n"); |
b4ba2611 | 2171 | par->hotdrop = true; |
1d93a9cb | 2172 | return false; |
1da177e4 LT |
2173 | } |
2174 | ||
2175 | return icmp6_type_code_match(icmpinfo->type, | |
2176 | icmpinfo->code[0], | |
2177 | icmpinfo->code[1], | |
2178 | ic->icmp6_type, ic->icmp6_code, | |
2179 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2180 | } | |
2181 | ||
2182 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 2183 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2184 | { |
9b4fce7a | 2185 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2186 | |
7f939713 | 2187 | /* Must specify no unknown invflags */ |
bd414ee6 | 2188 | return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2189 | } |
2190 | ||
2191 | /* The built-in targets: standard (NULL) and error. */ | |
4538506b JE |
2192 | static struct xt_target ip6t_builtin_tg[] __read_mostly = { |
2193 | { | |
2194 | .name = IP6T_STANDARD_TARGET, | |
2195 | .targetsize = sizeof(int), | |
2196 | .family = NFPROTO_IPV6, | |
3bc3fe5e | 2197 | #ifdef CONFIG_COMPAT |
4538506b JE |
2198 | .compatsize = sizeof(compat_int_t), |
2199 | .compat_from_user = compat_standard_from_user, | |
2200 | .compat_to_user = compat_standard_to_user, | |
3bc3fe5e | 2201 | #endif |
4538506b JE |
2202 | }, |
2203 | { | |
2204 | .name = IP6T_ERROR_TARGET, | |
2205 | .target = ip6t_error, | |
2206 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, | |
2207 | .family = NFPROTO_IPV6, | |
2208 | }, | |
1da177e4 LT |
2209 | }; |
2210 | ||
2211 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2212 | .pf = PF_INET6, | |
2213 | .set_optmin = IP6T_BASE_CTL, | |
2214 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2215 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2216 | #ifdef CONFIG_COMPAT |
2217 | .compat_set = compat_do_ip6t_set_ctl, | |
2218 | #endif | |
1da177e4 LT |
2219 | .get_optmin = IP6T_BASE_CTL, |
2220 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2221 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2222 | #ifdef CONFIG_COMPAT |
2223 | .compat_get = compat_do_ip6t_get_ctl, | |
2224 | #endif | |
16fcec35 | 2225 | .owner = THIS_MODULE, |
1da177e4 LT |
2226 | }; |
2227 | ||
4538506b JE |
2228 | static struct xt_match ip6t_builtin_mt[] __read_mostly = { |
2229 | { | |
2230 | .name = "icmp6", | |
2231 | .match = icmp6_match, | |
2232 | .matchsize = sizeof(struct ip6t_icmp), | |
2233 | .checkentry = icmp6_checkentry, | |
2234 | .proto = IPPROTO_ICMPV6, | |
2235 | .family = NFPROTO_IPV6, | |
2236 | }, | |
1da177e4 LT |
2237 | }; |
2238 | ||
3cb609d5 AD |
2239 | static int __net_init ip6_tables_net_init(struct net *net) |
2240 | { | |
383ca5b8 | 2241 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2242 | } |
2243 | ||
2244 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2245 | { | |
383ca5b8 | 2246 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2247 | } |
2248 | ||
2249 | static struct pernet_operations ip6_tables_net_ops = { | |
2250 | .init = ip6_tables_net_init, | |
2251 | .exit = ip6_tables_net_exit, | |
2252 | }; | |
2253 | ||
65b4b4e8 | 2254 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2255 | { |
2256 | int ret; | |
2257 | ||
3cb609d5 | 2258 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2259 | if (ret < 0) |
2260 | goto err1; | |
2e4e6a17 | 2261 | |
1da177e4 | 2262 | /* Noone else will be downing sem now, so we won't sleep */ |
4538506b | 2263 | ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 PM |
2264 | if (ret < 0) |
2265 | goto err2; | |
4538506b | 2266 | ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 PM |
2267 | if (ret < 0) |
2268 | goto err4; | |
1da177e4 LT |
2269 | |
2270 | /* Register setsockopt */ | |
2271 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2272 | if (ret < 0) |
2273 | goto err5; | |
1da177e4 | 2274 | |
ff67e4e4 | 2275 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2276 | return 0; |
0eff66e6 PM |
2277 | |
2278 | err5: | |
4538506b | 2279 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 | 2280 | err4: |
4538506b | 2281 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 | 2282 | err2: |
3cb609d5 | 2283 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2284 | err1: |
2285 | return ret; | |
1da177e4 LT |
2286 | } |
2287 | ||
65b4b4e8 | 2288 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2289 | { |
2290 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2291 | |
4538506b JE |
2292 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
2293 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); | |
3cb609d5 | 2294 | unregister_pernet_subsys(&ip6_tables_net_ops); |
1da177e4 LT |
2295 | } |
2296 | ||
e674d0f3 | 2297 | /* |
b777e0ce PM |
2298 | * find the offset to specified header or the protocol number of last header |
2299 | * if target < 0. "last header" is transport protocol header, ESP, or | |
2300 | * "No next header". | |
2301 | * | |
2302 | * If target header is found, its offset is set in *offset and return protocol | |
2303 | * number. Otherwise, return -1. | |
2304 | * | |
6d381634 PM |
2305 | * If the first fragment doesn't contain the final protocol header or |
2306 | * NEXTHDR_NONE it is considered invalid. | |
2307 | * | |
b777e0ce PM |
2308 | * Note that non-1st fragment is special case that "the protocol number |
2309 | * of last header" is "next header" field in Fragment header. In this case, | |
2310 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
2311 | * isn't NULL. | |
e674d0f3 | 2312 | * |
e674d0f3 | 2313 | */ |
b777e0ce PM |
2314 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
2315 | int target, unsigned short *fragoff) | |
e674d0f3 | 2316 | { |
6b88dd96 | 2317 | unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); |
0660e03f | 2318 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
e674d0f3 YK |
2319 | unsigned int len = skb->len - start; |
2320 | ||
b777e0ce PM |
2321 | if (fragoff) |
2322 | *fragoff = 0; | |
2323 | ||
e674d0f3 YK |
2324 | while (nexthdr != target) { |
2325 | struct ipv6_opt_hdr _hdr, *hp; | |
2326 | unsigned int hdrlen; | |
2327 | ||
b777e0ce PM |
2328 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
2329 | if (target < 0) | |
2330 | break; | |
6d381634 | 2331 | return -ENOENT; |
b777e0ce PM |
2332 | } |
2333 | ||
e674d0f3 YK |
2334 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
2335 | if (hp == NULL) | |
6d381634 | 2336 | return -EBADMSG; |
e674d0f3 | 2337 | if (nexthdr == NEXTHDR_FRAGMENT) { |
e69a4adc AV |
2338 | unsigned short _frag_off; |
2339 | __be16 *fp; | |
e674d0f3 YK |
2340 | fp = skb_header_pointer(skb, |
2341 | start+offsetof(struct frag_hdr, | |
2342 | frag_off), | |
2343 | sizeof(_frag_off), | |
2344 | &_frag_off); | |
2345 | if (fp == NULL) | |
6d381634 | 2346 | return -EBADMSG; |
e674d0f3 | 2347 | |
b777e0ce PM |
2348 | _frag_off = ntohs(*fp) & ~0x7; |
2349 | if (_frag_off) { | |
2350 | if (target < 0 && | |
2351 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
337dde79 | 2352 | hp->nexthdr == NEXTHDR_NONE)) { |
b777e0ce PM |
2353 | if (fragoff) |
2354 | *fragoff = _frag_off; | |
2355 | return hp->nexthdr; | |
2356 | } | |
6d381634 | 2357 | return -ENOENT; |
b777e0ce | 2358 | } |
e674d0f3 YK |
2359 | hdrlen = 8; |
2360 | } else if (nexthdr == NEXTHDR_AUTH) | |
1ab1457c | 2361 | hdrlen = (hp->hdrlen + 2) << 2; |
e674d0f3 | 2362 | else |
1ab1457c | 2363 | hdrlen = ipv6_optlen(hp); |
e674d0f3 YK |
2364 | |
2365 | nexthdr = hp->nexthdr; | |
2366 | len -= hdrlen; | |
2367 | start += hdrlen; | |
2368 | } | |
2369 | ||
2370 | *offset = start; | |
b777e0ce | 2371 | return nexthdr; |
e674d0f3 YK |
2372 | } |
2373 | ||
1da177e4 LT |
2374 | EXPORT_SYMBOL(ip6t_register_table); |
2375 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2376 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2377 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 2378 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 2379 | |
65b4b4e8 AM |
2380 | module_init(ip6_tables_init); |
2381 | module_exit(ip6_tables_fini); |