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 | */ |
4fc268d2 RD |
11 | |
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> |
1da177e4 LT |
32 | |
33 | MODULE_LICENSE("GPL"); | |
34 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
35 | MODULE_DESCRIPTION("IPv6 packet filter"); | |
36 | ||
1da177e4 LT |
37 | /*#define DEBUG_IP_FIREWALL*/ |
38 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
39 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
40 | ||
41 | #ifdef DEBUG_IP_FIREWALL | |
42 | #define dprintf(format, args...) printk(format , ## args) | |
43 | #else | |
44 | #define dprintf(format, args...) | |
45 | #endif | |
46 | ||
47 | #ifdef DEBUG_IP_FIREWALL_USER | |
48 | #define duprintf(format, args...) printk(format , ## args) | |
49 | #else | |
50 | #define duprintf(format, args...) | |
51 | #endif | |
52 | ||
53 | #ifdef CONFIG_NETFILTER_DEBUG | |
54 | #define IP_NF_ASSERT(x) \ | |
55 | do { \ | |
56 | if (!(x)) \ | |
57 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ | |
0dc47877 | 58 | __func__, __FILE__, __LINE__); \ |
1da177e4 LT |
59 | } while(0) |
60 | #else | |
61 | #define IP_NF_ASSERT(x) | |
62 | #endif | |
1da177e4 | 63 | |
1da177e4 LT |
64 | #if 0 |
65 | /* All the better to debug you with... */ | |
66 | #define static | |
67 | #define inline | |
68 | #endif | |
69 | ||
6b7d31fc | 70 | /* |
1da177e4 | 71 | We keep a set of rules for each CPU, so we can avoid write-locking |
6b7d31fc HW |
72 | them in the softirq when updating the counters and therefore |
73 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
74 | context stops packets coming through and allows user context to read | |
75 | the counters or update the rules. | |
1da177e4 | 76 | |
1da177e4 LT |
77 | Hence the start of any table is given by get_table() below. */ |
78 | ||
1da177e4 | 79 | /* Check for an extension */ |
1ab1457c | 80 | int |
1da177e4 LT |
81 | ip6t_ext_hdr(u8 nexthdr) |
82 | { | |
1ab1457c YH |
83 | return ( (nexthdr == IPPROTO_HOPOPTS) || |
84 | (nexthdr == IPPROTO_ROUTING) || | |
85 | (nexthdr == IPPROTO_FRAGMENT) || | |
86 | (nexthdr == IPPROTO_ESP) || | |
87 | (nexthdr == IPPROTO_AH) || | |
88 | (nexthdr == IPPROTO_NONE) || | |
89 | (nexthdr == IPPROTO_DSTOPTS) ); | |
1da177e4 LT |
90 | } |
91 | ||
92 | /* Returns whether matches rule or not. */ | |
022748a9 | 93 | /* Performance critical - called for every packet */ |
1d93a9cb | 94 | static inline bool |
1da177e4 LT |
95 | ip6_packet_match(const struct sk_buff *skb, |
96 | const char *indev, | |
97 | const char *outdev, | |
98 | const struct ip6t_ip6 *ip6info, | |
99 | unsigned int *protoff, | |
cff533ac | 100 | int *fragoff, bool *hotdrop) |
1da177e4 LT |
101 | { |
102 | size_t i; | |
103 | unsigned long ret; | |
0660e03f | 104 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
1da177e4 | 105 | |
e79ec50b | 106 | #define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg))) |
1da177e4 | 107 | |
f2ffd9ee | 108 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
1ab1457c | 109 | &ip6info->src), IP6T_INV_SRCIP) |
f2ffd9ee | 110 | || FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, |
1ab1457c | 111 | &ip6info->dst), IP6T_INV_DSTIP)) { |
1da177e4 LT |
112 | dprintf("Source or dest mismatch.\n"); |
113 | /* | |
114 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, | |
115 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, | |
116 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); | |
117 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, | |
118 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, | |
119 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ | |
1d93a9cb | 120 | return false; |
1da177e4 LT |
121 | } |
122 | ||
123 | /* Look for ifname matches; this should unroll nicely. */ | |
124 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
125 | ret |= (((const unsigned long *)indev)[i] | |
126 | ^ ((const unsigned long *)ip6info->iniface)[i]) | |
127 | & ((const unsigned long *)ip6info->iniface_mask)[i]; | |
128 | } | |
129 | ||
130 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { | |
131 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
132 | indev, ip6info->iniface, | |
133 | ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":""); | |
1d93a9cb | 134 | return false; |
1da177e4 LT |
135 | } |
136 | ||
137 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
138 | ret |= (((const unsigned long *)outdev)[i] | |
139 | ^ ((const unsigned long *)ip6info->outiface)[i]) | |
140 | & ((const unsigned long *)ip6info->outiface_mask)[i]; | |
141 | } | |
142 | ||
143 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { | |
144 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
145 | outdev, ip6info->outiface, | |
146 | ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":""); | |
1d93a9cb | 147 | return false; |
1da177e4 LT |
148 | } |
149 | ||
150 | /* ... might want to do something with class and flowlabel here ... */ | |
151 | ||
152 | /* look for the desired protocol header */ | |
153 | if((ip6info->flags & IP6T_F_PROTO)) { | |
b777e0ce PM |
154 | int protohdr; |
155 | unsigned short _frag_off; | |
1da177e4 | 156 | |
b777e0ce | 157 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off); |
51d8b1a6 PM |
158 | if (protohdr < 0) { |
159 | if (_frag_off == 0) | |
cff533ac | 160 | *hotdrop = true; |
1d93a9cb | 161 | return false; |
51d8b1a6 | 162 | } |
b777e0ce | 163 | *fragoff = _frag_off; |
1da177e4 LT |
164 | |
165 | dprintf("Packet protocol %hi ?= %s%hi.\n", | |
1ab1457c | 166 | protohdr, |
1da177e4 LT |
167 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
168 | ip6info->proto); | |
169 | ||
b777e0ce | 170 | if (ip6info->proto == protohdr) { |
1da177e4 | 171 | if(ip6info->invflags & IP6T_INV_PROTO) { |
1d93a9cb | 172 | return false; |
1da177e4 | 173 | } |
1d93a9cb | 174 | return true; |
1da177e4 LT |
175 | } |
176 | ||
177 | /* We need match for the '-p all', too! */ | |
178 | if ((ip6info->proto != 0) && | |
179 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
1d93a9cb | 180 | return false; |
1da177e4 | 181 | } |
1d93a9cb | 182 | return true; |
1da177e4 LT |
183 | } |
184 | ||
185 | /* should be ip6 safe */ | |
022748a9 | 186 | static bool |
1da177e4 LT |
187 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
188 | { | |
189 | if (ipv6->flags & ~IP6T_F_MASK) { | |
190 | duprintf("Unknown flag bits set: %08X\n", | |
191 | ipv6->flags & ~IP6T_F_MASK); | |
ccb79bdc | 192 | return false; |
1da177e4 LT |
193 | } |
194 | if (ipv6->invflags & ~IP6T_INV_MASK) { | |
195 | duprintf("Unknown invflag bits set: %08X\n", | |
196 | ipv6->invflags & ~IP6T_INV_MASK); | |
ccb79bdc | 197 | return false; |
1da177e4 | 198 | } |
ccb79bdc | 199 | return true; |
1da177e4 LT |
200 | } |
201 | ||
202 | static unsigned int | |
7eb35586 | 203 | ip6t_error(struct sk_buff *skb, const struct xt_target_param *par) |
1da177e4 LT |
204 | { |
205 | if (net_ratelimit()) | |
7eb35586 JE |
206 | printk("ip6_tables: error: `%s'\n", |
207 | (const char *)par->targinfo); | |
1da177e4 LT |
208 | |
209 | return NF_DROP; | |
210 | } | |
211 | ||
022748a9 DV |
212 | /* Performance critical - called for every packet */ |
213 | static inline bool | |
f7108a20 JE |
214 | do_match(struct ip6t_entry_match *m, const struct sk_buff *skb, |
215 | struct xt_match_param *par) | |
1da177e4 | 216 | { |
f7108a20 JE |
217 | par->match = m->u.kernel.match; |
218 | par->matchinfo = m->data; | |
219 | ||
1da177e4 | 220 | /* Stop iteration if it doesn't match */ |
f7108a20 | 221 | if (!m->u.kernel.match->match(skb, par)) |
1d93a9cb | 222 | return true; |
1da177e4 | 223 | else |
1d93a9cb | 224 | return false; |
1da177e4 LT |
225 | } |
226 | ||
227 | static inline struct ip6t_entry * | |
228 | get_entry(void *base, unsigned int offset) | |
229 | { | |
230 | return (struct ip6t_entry *)(base + offset); | |
231 | } | |
232 | ||
ba9dda3a | 233 | /* All zeroes == unconditional rule. */ |
022748a9 | 234 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
235 | static inline int |
236 | unconditional(const struct ip6t_ip6 *ipv6) | |
237 | { | |
238 | unsigned int i; | |
239 | ||
240 | for (i = 0; i < sizeof(*ipv6); i++) | |
241 | if (((char *)ipv6)[i]) | |
242 | break; | |
243 | ||
244 | return (i == sizeof(*ipv6)); | |
245 | } | |
246 | ||
247 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
248 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
249 | /* This cries for unification! */ | |
022748a9 | 250 | static const char *const hooknames[] = { |
6e23ae2a PM |
251 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
252 | [NF_INET_LOCAL_IN] = "INPUT", | |
253 | [NF_INET_FORWARD] = "FORWARD", | |
254 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
255 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
256 | }; |
257 | ||
258 | enum nf_ip_trace_comments { | |
259 | NF_IP6_TRACE_COMMENT_RULE, | |
260 | NF_IP6_TRACE_COMMENT_RETURN, | |
261 | NF_IP6_TRACE_COMMENT_POLICY, | |
262 | }; | |
263 | ||
022748a9 | 264 | static const char *const comments[] = { |
ba9dda3a JK |
265 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
266 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
267 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
268 | }; | |
269 | ||
270 | static struct nf_loginfo trace_loginfo = { | |
271 | .type = NF_LOG_TYPE_LOG, | |
272 | .u = { | |
273 | .log = { | |
274 | .level = 4, | |
275 | .logflags = NF_LOG_MASK, | |
276 | }, | |
277 | }, | |
278 | }; | |
279 | ||
022748a9 | 280 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
281 | static inline int |
282 | get_chainname_rulenum(struct ip6t_entry *s, struct ip6t_entry *e, | |
283 | char *hookname, char **chainname, | |
284 | char **comment, unsigned int *rulenum) | |
285 | { | |
286 | struct ip6t_standard_target *t = (void *)ip6t_get_target(s); | |
287 | ||
288 | if (strcmp(t->target.u.kernel.target->name, IP6T_ERROR_TARGET) == 0) { | |
289 | /* Head of user chain: ERROR target with chainname */ | |
290 | *chainname = t->target.data; | |
291 | (*rulenum) = 0; | |
292 | } else if (s == e) { | |
293 | (*rulenum)++; | |
294 | ||
295 | if (s->target_offset == sizeof(struct ip6t_entry) | |
296 | && strcmp(t->target.u.kernel.target->name, | |
297 | IP6T_STANDARD_TARGET) == 0 | |
298 | && t->verdict < 0 | |
299 | && unconditional(&s->ipv6)) { | |
300 | /* Tail of chains: STANDARD target (return/policy) */ | |
301 | *comment = *chainname == hookname | |
302 | ? (char *)comments[NF_IP6_TRACE_COMMENT_POLICY] | |
303 | : (char *)comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
304 | } | |
305 | return 1; | |
306 | } else | |
307 | (*rulenum)++; | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | static void trace_packet(struct sk_buff *skb, | |
313 | unsigned int hook, | |
314 | const struct net_device *in, | |
315 | const struct net_device *out, | |
ecb6f85e | 316 | const char *tablename, |
ba9dda3a JK |
317 | struct xt_table_info *private, |
318 | struct ip6t_entry *e) | |
319 | { | |
320 | void *table_base; | |
5452e425 | 321 | const struct ip6t_entry *root; |
ba9dda3a JK |
322 | char *hookname, *chainname, *comment; |
323 | unsigned int rulenum = 0; | |
324 | ||
325 | table_base = (void *)private->entries[smp_processor_id()]; | |
326 | root = get_entry(table_base, private->hook_entry[hook]); | |
327 | ||
328 | hookname = chainname = (char *)hooknames[hook]; | |
329 | comment = (char *)comments[NF_IP6_TRACE_COMMENT_RULE]; | |
330 | ||
331 | IP6T_ENTRY_ITERATE(root, | |
332 | private->size - private->hook_entry[hook], | |
333 | get_chainname_rulenum, | |
334 | e, hookname, &chainname, &comment, &rulenum); | |
335 | ||
336 | nf_log_packet(AF_INET6, hook, skb, in, out, &trace_loginfo, | |
337 | "TRACE: %s:%s:%s:%u ", | |
338 | tablename, chainname, comment, rulenum); | |
339 | } | |
340 | #endif | |
341 | ||
1da177e4 LT |
342 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
343 | unsigned int | |
3db05fea | 344 | ip6t_do_table(struct sk_buff *skb, |
1da177e4 LT |
345 | unsigned int hook, |
346 | const struct net_device *in, | |
347 | const struct net_device *out, | |
fe1cb108 | 348 | struct xt_table *table) |
1da177e4 | 349 | { |
6b7d31fc | 350 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
cff533ac | 351 | bool hotdrop = false; |
1da177e4 LT |
352 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
353 | unsigned int verdict = NF_DROP; | |
354 | const char *indev, *outdev; | |
355 | void *table_base; | |
356 | struct ip6t_entry *e, *back; | |
2e4e6a17 | 357 | struct xt_table_info *private; |
f7108a20 | 358 | struct xt_match_param mtpar; |
7eb35586 | 359 | struct xt_target_param tgpar; |
1da177e4 LT |
360 | |
361 | /* Initialization */ | |
362 | indev = in ? in->name : nulldevname; | |
363 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
364 | /* We handle fragments by dealing with the first fragment as |
365 | * if it was a normal packet. All other fragments are treated | |
366 | * normally, except that they will NEVER match rules that ask | |
367 | * things we don't know, ie. tcp syn flag or ports). If the | |
368 | * rule is also a fragment-specific rule, non-fragments won't | |
369 | * match it. */ | |
f7108a20 | 370 | mtpar.hotdrop = &hotdrop; |
7eb35586 JE |
371 | mtpar.in = tgpar.in = in; |
372 | mtpar.out = tgpar.out = out; | |
373 | tgpar.hooknum = hook; | |
1da177e4 LT |
374 | |
375 | read_lock_bh(&table->lock); | |
376 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); | |
9c547959 | 377 | private = table->private; |
2e4e6a17 HW |
378 | table_base = (void *)private->entries[smp_processor_id()]; |
379 | e = get_entry(table_base, private->hook_entry[hook]); | |
1da177e4 | 380 | |
1da177e4 | 381 | /* For return from builtin chain */ |
2e4e6a17 | 382 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
383 | |
384 | do { | |
385 | IP_NF_ASSERT(e); | |
386 | IP_NF_ASSERT(back); | |
3db05fea | 387 | if (ip6_packet_match(skb, indev, outdev, &e->ipv6, |
f7108a20 | 388 | &mtpar.thoff, &mtpar.fragoff, &hotdrop)) { |
1da177e4 LT |
389 | struct ip6t_entry_target *t; |
390 | ||
f7108a20 | 391 | if (IP6T_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) |
1da177e4 LT |
392 | goto no_match; |
393 | ||
394 | ADD_COUNTER(e->counters, | |
72f36ec1 PM |
395 | ntohs(ipv6_hdr(skb)->payload_len) + |
396 | sizeof(struct ipv6hdr), 1); | |
1da177e4 LT |
397 | |
398 | t = ip6t_get_target(e); | |
399 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
400 | |
401 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
402 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
403 | /* The packet is traced: log it */ | |
3db05fea HX |
404 | if (unlikely(skb->nf_trace)) |
405 | trace_packet(skb, hook, in, out, | |
ba9dda3a JK |
406 | table->name, private, e); |
407 | #endif | |
1da177e4 LT |
408 | /* Standard target? */ |
409 | if (!t->u.kernel.target->target) { | |
410 | int v; | |
411 | ||
412 | v = ((struct ip6t_standard_target *)t)->verdict; | |
413 | if (v < 0) { | |
414 | /* Pop from stack? */ | |
415 | if (v != IP6T_RETURN) { | |
416 | verdict = (unsigned)(-v) - 1; | |
417 | break; | |
418 | } | |
419 | e = back; | |
420 | back = get_entry(table_base, | |
421 | back->comefrom); | |
422 | continue; | |
423 | } | |
05465343 PM |
424 | if (table_base + v != (void *)e + e->next_offset |
425 | && !(e->ipv6.flags & IP6T_F_GOTO)) { | |
1da177e4 LT |
426 | /* Save old back ptr in next entry */ |
427 | struct ip6t_entry *next | |
428 | = (void *)e + e->next_offset; | |
429 | next->comefrom | |
430 | = (void *)back - table_base; | |
431 | /* set back pointer to next entry */ | |
432 | back = next; | |
433 | } | |
434 | ||
435 | e = get_entry(table_base, v); | |
436 | } else { | |
437 | /* Targets which reenter must return | |
1ab1457c | 438 | abs. verdicts */ |
7eb35586 JE |
439 | tgpar.target = t->u.kernel.target; |
440 | tgpar.targinfo = t->data; | |
441 | ||
1da177e4 LT |
442 | #ifdef CONFIG_NETFILTER_DEBUG |
443 | ((struct ip6t_entry *)table_base)->comefrom | |
444 | = 0xeeeeeeec; | |
445 | #endif | |
3db05fea | 446 | verdict = t->u.kernel.target->target(skb, |
7eb35586 | 447 | &tgpar); |
1da177e4 LT |
448 | |
449 | #ifdef CONFIG_NETFILTER_DEBUG | |
450 | if (((struct ip6t_entry *)table_base)->comefrom | |
451 | != 0xeeeeeeec | |
452 | && verdict == IP6T_CONTINUE) { | |
453 | printk("Target %s reentered!\n", | |
454 | t->u.kernel.target->name); | |
455 | verdict = NF_DROP; | |
456 | } | |
457 | ((struct ip6t_entry *)table_base)->comefrom | |
458 | = 0x57acc001; | |
459 | #endif | |
460 | if (verdict == IP6T_CONTINUE) | |
461 | e = (void *)e + e->next_offset; | |
462 | else | |
463 | /* Verdict */ | |
464 | break; | |
465 | } | |
466 | } else { | |
467 | ||
468 | no_match: | |
469 | e = (void *)e + e->next_offset; | |
470 | } | |
471 | } while (!hotdrop); | |
472 | ||
473 | #ifdef CONFIG_NETFILTER_DEBUG | |
4bdbf6c0 | 474 | ((struct ip6t_entry *)table_base)->comefrom = NETFILTER_LINK_POISON; |
1da177e4 LT |
475 | #endif |
476 | read_unlock_bh(&table->lock); | |
477 | ||
478 | #ifdef DEBUG_ALLOW_ALL | |
479 | return NF_ACCEPT; | |
480 | #else | |
481 | if (hotdrop) | |
482 | return NF_DROP; | |
483 | else return verdict; | |
484 | #endif | |
485 | } | |
486 | ||
1da177e4 LT |
487 | /* Figures out from what hook each rule can be called: returns 0 if |
488 | there are loops. Puts hook bitmask in comefrom. */ | |
489 | static int | |
2e4e6a17 | 490 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 491 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
492 | { |
493 | unsigned int hook; | |
494 | ||
495 | /* No recursion; use packet counter to save back ptrs (reset | |
496 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 497 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 498 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 499 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
500 | |
501 | if (!(valid_hooks & (1 << hook))) | |
502 | continue; | |
503 | ||
504 | /* Set initial back pointer. */ | |
505 | e->counters.pcnt = pos; | |
506 | ||
507 | for (;;) { | |
508 | struct ip6t_standard_target *t | |
509 | = (void *)ip6t_get_target(e); | |
9c547959 | 510 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 511 | |
6e23ae2a | 512 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
513 | printk("iptables: loop hook %u pos %u %08X.\n", |
514 | hook, pos, e->comefrom); | |
515 | return 0; | |
516 | } | |
9c547959 | 517 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
518 | |
519 | /* Unconditional return/END. */ | |
e1b4b9f3 | 520 | if ((e->target_offset == sizeof(struct ip6t_entry) |
1da177e4 LT |
521 | && (strcmp(t->target.u.user.name, |
522 | IP6T_STANDARD_TARGET) == 0) | |
523 | && t->verdict < 0 | |
e1b4b9f3 | 524 | && unconditional(&e->ipv6)) || visited) { |
1da177e4 LT |
525 | unsigned int oldpos, size; |
526 | ||
74c9c0c1 DM |
527 | if (t->verdict < -NF_MAX_VERDICT - 1) { |
528 | duprintf("mark_source_chains: bad " | |
529 | "negative verdict (%i)\n", | |
530 | t->verdict); | |
531 | return 0; | |
532 | } | |
533 | ||
1da177e4 LT |
534 | /* Return: backtrack through the last |
535 | big jump. */ | |
536 | do { | |
6e23ae2a | 537 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
538 | #ifdef DEBUG_IP_FIREWALL_USER |
539 | if (e->comefrom | |
6e23ae2a | 540 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
541 | duprintf("Back unset " |
542 | "on hook %u " | |
543 | "rule %u\n", | |
544 | hook, pos); | |
545 | } | |
546 | #endif | |
547 | oldpos = pos; | |
548 | pos = e->counters.pcnt; | |
549 | e->counters.pcnt = 0; | |
550 | ||
551 | /* We're at the start. */ | |
552 | if (pos == oldpos) | |
553 | goto next; | |
554 | ||
555 | e = (struct ip6t_entry *) | |
31836064 | 556 | (entry0 + pos); |
1da177e4 LT |
557 | } while (oldpos == pos + e->next_offset); |
558 | ||
559 | /* Move along one */ | |
560 | size = e->next_offset; | |
561 | e = (struct ip6t_entry *) | |
31836064 | 562 | (entry0 + pos + size); |
1da177e4 LT |
563 | e->counters.pcnt = pos; |
564 | pos += size; | |
565 | } else { | |
566 | int newpos = t->verdict; | |
567 | ||
568 | if (strcmp(t->target.u.user.name, | |
569 | IP6T_STANDARD_TARGET) == 0 | |
570 | && newpos >= 0) { | |
74c9c0c1 DM |
571 | if (newpos > newinfo->size - |
572 | sizeof(struct ip6t_entry)) { | |
573 | duprintf("mark_source_chains: " | |
574 | "bad verdict (%i)\n", | |
575 | newpos); | |
576 | return 0; | |
577 | } | |
1da177e4 LT |
578 | /* This a jump; chase it. */ |
579 | duprintf("Jump rule %u -> %u\n", | |
580 | pos, newpos); | |
581 | } else { | |
582 | /* ... this is a fallthru */ | |
583 | newpos = pos + e->next_offset; | |
584 | } | |
585 | e = (struct ip6t_entry *) | |
31836064 | 586 | (entry0 + newpos); |
1da177e4 LT |
587 | e->counters.pcnt = pos; |
588 | pos = newpos; | |
589 | } | |
590 | } | |
591 | next: | |
592 | duprintf("Finished chain %u\n", hook); | |
593 | } | |
594 | return 1; | |
595 | } | |
596 | ||
022748a9 | 597 | static int |
1da177e4 LT |
598 | cleanup_match(struct ip6t_entry_match *m, unsigned int *i) |
599 | { | |
6be3d859 JE |
600 | struct xt_mtdtor_param par; |
601 | ||
1da177e4 LT |
602 | if (i && (*i)-- == 0) |
603 | return 1; | |
604 | ||
6be3d859 JE |
605 | par.match = m->u.kernel.match; |
606 | par.matchinfo = m->data; | |
607 | if (par.match->destroy != NULL) | |
608 | par.match->destroy(&par); | |
609 | module_put(par.match->me); | |
1da177e4 LT |
610 | return 0; |
611 | } | |
612 | ||
022748a9 | 613 | static int |
f173c8a1 PM |
614 | check_entry(struct ip6t_entry *e, const char *name) |
615 | { | |
616 | struct ip6t_entry_target *t; | |
617 | ||
618 | if (!ip6_checkentry(&e->ipv6)) { | |
619 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
620 | return -EINVAL; | |
621 | } | |
622 | ||
623 | if (e->target_offset + sizeof(struct ip6t_entry_target) > | |
624 | e->next_offset) | |
625 | return -EINVAL; | |
626 | ||
627 | t = ip6t_get_target(e); | |
628 | if (e->target_offset + t->u.target_size > e->next_offset) | |
629 | return -EINVAL; | |
630 | ||
631 | return 0; | |
632 | } | |
633 | ||
9b4fce7a JE |
634 | static int check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par, |
635 | unsigned int *i) | |
f173c8a1 | 636 | { |
9b4fce7a | 637 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
638 | int ret; |
639 | ||
9b4fce7a JE |
640 | par->match = m->u.kernel.match; |
641 | par->matchinfo = m->data; | |
642 | ||
643 | ret = xt_check_match(par, NFPROTO_IPV6, m->u.match_size - sizeof(*m), | |
644 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); | |
367c6790 | 645 | if (ret < 0) { |
f173c8a1 | 646 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 647 | par.match->name); |
367c6790 | 648 | return ret; |
f173c8a1 | 649 | } |
367c6790 JE |
650 | ++*i; |
651 | return 0; | |
f173c8a1 PM |
652 | } |
653 | ||
022748a9 | 654 | static int |
9b4fce7a | 655 | find_check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par, |
f173c8a1 | 656 | unsigned int *i) |
1da177e4 | 657 | { |
6709dbbb | 658 | struct xt_match *match; |
3cdc7c95 | 659 | int ret; |
1da177e4 | 660 | |
2e4e6a17 | 661 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, |
9c547959 | 662 | m->u.user.revision), |
6b7d31fc HW |
663 | "ip6t_%s", m->u.user.name); |
664 | if (IS_ERR(match) || !match) { | |
f173c8a1 | 665 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
6b7d31fc | 666 | return match ? PTR_ERR(match) : -ENOENT; |
1da177e4 LT |
667 | } |
668 | m->u.kernel.match = match; | |
1da177e4 | 669 | |
9b4fce7a | 670 | ret = check_match(m, par, i); |
3cdc7c95 PM |
671 | if (ret) |
672 | goto err; | |
673 | ||
1da177e4 | 674 | return 0; |
3cdc7c95 PM |
675 | err: |
676 | module_put(m->u.kernel.match->me); | |
677 | return ret; | |
1da177e4 LT |
678 | } |
679 | ||
022748a9 | 680 | static int check_target(struct ip6t_entry *e, const char *name) |
1da177e4 | 681 | { |
af5d6dc2 JE |
682 | struct ip6t_entry_target *t = ip6t_get_target(e); |
683 | struct xt_tgchk_param par = { | |
684 | .table = name, | |
685 | .entryinfo = e, | |
686 | .target = t->u.kernel.target, | |
687 | .targinfo = t->data, | |
688 | .hook_mask = e->comefrom, | |
689 | }; | |
1da177e4 | 690 | int ret; |
1da177e4 | 691 | |
f173c8a1 | 692 | t = ip6t_get_target(e); |
af5d6dc2 JE |
693 | ret = xt_check_target(&par, NFPROTO_IPV6, t->u.target_size - sizeof(*t), |
694 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); | |
367c6790 | 695 | if (ret < 0) { |
f173c8a1 PM |
696 | duprintf("ip_tables: check failed for `%s'.\n", |
697 | t->u.kernel.target->name); | |
367c6790 | 698 | return ret; |
1da177e4 | 699 | } |
367c6790 | 700 | return 0; |
f173c8a1 | 701 | } |
1da177e4 | 702 | |
022748a9 | 703 | static int |
f173c8a1 PM |
704 | find_check_entry(struct ip6t_entry *e, const char *name, unsigned int size, |
705 | unsigned int *i) | |
706 | { | |
707 | struct ip6t_entry_target *t; | |
708 | struct xt_target *target; | |
709 | int ret; | |
710 | unsigned int j; | |
9b4fce7a | 711 | struct xt_mtchk_param mtpar; |
f173c8a1 PM |
712 | |
713 | ret = check_entry(e, name); | |
714 | if (ret) | |
715 | return ret; | |
590bdf7f | 716 | |
1da177e4 | 717 | j = 0; |
9b4fce7a JE |
718 | mtpar.table = name; |
719 | mtpar.entryinfo = &e->ipv6; | |
720 | mtpar.hook_mask = e->comefrom; | |
721 | ret = IP6T_MATCH_ITERATE(e, find_check_match, &mtpar, &j); | |
1da177e4 LT |
722 | if (ret != 0) |
723 | goto cleanup_matches; | |
724 | ||
725 | t = ip6t_get_target(e); | |
2e4e6a17 HW |
726 | target = try_then_request_module(xt_find_target(AF_INET6, |
727 | t->u.user.name, | |
728 | t->u.user.revision), | |
6b7d31fc HW |
729 | "ip6t_%s", t->u.user.name); |
730 | if (IS_ERR(target) || !target) { | |
f173c8a1 | 731 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
6b7d31fc | 732 | ret = target ? PTR_ERR(target) : -ENOENT; |
1da177e4 LT |
733 | goto cleanup_matches; |
734 | } | |
735 | t->u.kernel.target = target; | |
6b7d31fc | 736 | |
f173c8a1 | 737 | ret = check_target(e, name); |
3cdc7c95 PM |
738 | if (ret) |
739 | goto err; | |
740 | ||
1da177e4 LT |
741 | (*i)++; |
742 | return 0; | |
3cdc7c95 PM |
743 | err: |
744 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
745 | cleanup_matches: |
746 | IP6T_MATCH_ITERATE(e, cleanup_match, &j); | |
747 | return ret; | |
748 | } | |
749 | ||
022748a9 | 750 | static int |
1da177e4 | 751 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 752 | struct xt_table_info *newinfo, |
1da177e4 LT |
753 | unsigned char *base, |
754 | unsigned char *limit, | |
755 | const unsigned int *hook_entries, | |
756 | const unsigned int *underflows, | |
757 | unsigned int *i) | |
758 | { | |
759 | unsigned int h; | |
760 | ||
761 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 | |
762 | || (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
763 | duprintf("Bad offset %p\n", e); | |
764 | return -EINVAL; | |
765 | } | |
766 | ||
767 | if (e->next_offset | |
768 | < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) { | |
769 | duprintf("checking: element %p size %u\n", | |
770 | e, e->next_offset); | |
771 | return -EINVAL; | |
772 | } | |
773 | ||
774 | /* Check hooks & underflows */ | |
6e23ae2a | 775 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
1da177e4 LT |
776 | if ((unsigned char *)e - base == hook_entries[h]) |
777 | newinfo->hook_entry[h] = hook_entries[h]; | |
778 | if ((unsigned char *)e - base == underflows[h]) | |
779 | newinfo->underflow[h] = underflows[h]; | |
780 | } | |
781 | ||
782 | /* FIXME: underflows must be unconditional, standard verdicts | |
1ab1457c | 783 | < 0 (not IP6T_RETURN). --RR */ |
1da177e4 LT |
784 | |
785 | /* Clear counters and comefrom */ | |
2e4e6a17 | 786 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
787 | e->comefrom = 0; |
788 | ||
789 | (*i)++; | |
790 | return 0; | |
791 | } | |
792 | ||
022748a9 | 793 | static int |
1da177e4 LT |
794 | cleanup_entry(struct ip6t_entry *e, unsigned int *i) |
795 | { | |
a2df1648 | 796 | struct xt_tgdtor_param par; |
1da177e4 LT |
797 | struct ip6t_entry_target *t; |
798 | ||
799 | if (i && (*i)-- == 0) | |
800 | return 1; | |
801 | ||
802 | /* Cleanup all matches */ | |
803 | IP6T_MATCH_ITERATE(e, cleanup_match, NULL); | |
804 | t = ip6t_get_target(e); | |
a2df1648 JE |
805 | |
806 | par.target = t->u.kernel.target; | |
807 | par.targinfo = t->data; | |
808 | if (par.target->destroy != NULL) | |
809 | par.target->destroy(&par); | |
810 | module_put(par.target->me); | |
1da177e4 LT |
811 | return 0; |
812 | } | |
813 | ||
814 | /* Checks and translates the user-supplied table segment (held in | |
815 | newinfo) */ | |
816 | static int | |
817 | translate_table(const char *name, | |
818 | unsigned int valid_hooks, | |
2e4e6a17 | 819 | struct xt_table_info *newinfo, |
31836064 | 820 | void *entry0, |
1da177e4 LT |
821 | unsigned int size, |
822 | unsigned int number, | |
823 | const unsigned int *hook_entries, | |
824 | const unsigned int *underflows) | |
825 | { | |
826 | unsigned int i; | |
827 | int ret; | |
828 | ||
829 | newinfo->size = size; | |
830 | newinfo->number = number; | |
831 | ||
832 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 833 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
834 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
835 | newinfo->underflow[i] = 0xFFFFFFFF; | |
836 | } | |
837 | ||
838 | duprintf("translate_table: size %u\n", newinfo->size); | |
839 | i = 0; | |
840 | /* Walk through entries, checking offsets. */ | |
31836064 | 841 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
842 | check_entry_size_and_hooks, |
843 | newinfo, | |
31836064 ED |
844 | entry0, |
845 | entry0 + size, | |
1da177e4 LT |
846 | hook_entries, underflows, &i); |
847 | if (ret != 0) | |
848 | return ret; | |
849 | ||
850 | if (i != number) { | |
851 | duprintf("translate_table: %u not %u entries\n", | |
852 | i, number); | |
853 | return -EINVAL; | |
854 | } | |
855 | ||
856 | /* Check hooks all assigned */ | |
6e23ae2a | 857 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
858 | /* Only hooks which are valid */ |
859 | if (!(valid_hooks & (1 << i))) | |
860 | continue; | |
861 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
862 | duprintf("Invalid hook entry %u %u\n", | |
863 | i, hook_entries[i]); | |
864 | return -EINVAL; | |
865 | } | |
866 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
867 | duprintf("Invalid underflow %u %u\n", | |
868 | i, underflows[i]); | |
869 | return -EINVAL; | |
870 | } | |
871 | } | |
872 | ||
74c9c0c1 DM |
873 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
874 | return -ELOOP; | |
875 | ||
1da177e4 LT |
876 | /* Finally, each sanity check must pass */ |
877 | i = 0; | |
31836064 | 878 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
f173c8a1 | 879 | find_check_entry, name, size, &i); |
1da177e4 | 880 | |
74c9c0c1 DM |
881 | if (ret != 0) { |
882 | IP6T_ENTRY_ITERATE(entry0, newinfo->size, | |
883 | cleanup_entry, &i); | |
884 | return ret; | |
885 | } | |
1da177e4 LT |
886 | |
887 | /* And one copy for every other CPU */ | |
6f912042 | 888 | for_each_possible_cpu(i) { |
31836064 ED |
889 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
890 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
891 | } |
892 | ||
9c547959 | 893 | return ret; |
1da177e4 LT |
894 | } |
895 | ||
1da177e4 LT |
896 | /* Gets counters. */ |
897 | static inline int | |
898 | add_entry_to_counter(const struct ip6t_entry *e, | |
2e4e6a17 | 899 | struct xt_counters total[], |
1da177e4 LT |
900 | unsigned int *i) |
901 | { | |
902 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
903 | ||
904 | (*i)++; | |
905 | return 0; | |
906 | } | |
907 | ||
31836064 ED |
908 | static inline int |
909 | set_entry_to_counter(const struct ip6t_entry *e, | |
910 | struct ip6t_counters total[], | |
911 | unsigned int *i) | |
912 | { | |
913 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
914 | ||
915 | (*i)++; | |
916 | return 0; | |
917 | } | |
918 | ||
1da177e4 | 919 | static void |
2e4e6a17 HW |
920 | get_counters(const struct xt_table_info *t, |
921 | struct xt_counters counters[]) | |
1da177e4 LT |
922 | { |
923 | unsigned int cpu; | |
924 | unsigned int i; | |
31836064 ED |
925 | unsigned int curcpu; |
926 | ||
927 | /* Instead of clearing (by a previous call to memset()) | |
928 | * the counters and using adds, we set the counters | |
929 | * with data used by 'current' CPU | |
930 | * We dont care about preemption here. | |
931 | */ | |
932 | curcpu = raw_smp_processor_id(); | |
933 | ||
934 | i = 0; | |
935 | IP6T_ENTRY_ITERATE(t->entries[curcpu], | |
936 | t->size, | |
937 | set_entry_to_counter, | |
938 | counters, | |
939 | &i); | |
1da177e4 | 940 | |
6f912042 | 941 | for_each_possible_cpu(cpu) { |
31836064 ED |
942 | if (cpu == curcpu) |
943 | continue; | |
1da177e4 | 944 | i = 0; |
31836064 | 945 | IP6T_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
946 | t->size, |
947 | add_entry_to_counter, | |
948 | counters, | |
949 | &i); | |
950 | } | |
951 | } | |
952 | ||
022748a9 | 953 | static struct xt_counters *alloc_counters(struct xt_table *table) |
1da177e4 | 954 | { |
ed1a6f5e | 955 | unsigned int countersize; |
2e4e6a17 | 956 | struct xt_counters *counters; |
5452e425 | 957 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
958 | |
959 | /* We need atomic snapshot of counters: rest doesn't change | |
960 | (other than comefrom, which userspace doesn't care | |
961 | about). */ | |
2e4e6a17 | 962 | countersize = sizeof(struct xt_counters) * private->number; |
3b84e92b | 963 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
964 | |
965 | if (counters == NULL) | |
ed1a6f5e | 966 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
967 | |
968 | /* First, sum counters... */ | |
1da177e4 | 969 | write_lock_bh(&table->lock); |
2e4e6a17 | 970 | get_counters(private, counters); |
1da177e4 LT |
971 | write_unlock_bh(&table->lock); |
972 | ||
ed1a6f5e PM |
973 | return counters; |
974 | } | |
975 | ||
976 | static int | |
977 | copy_entries_to_user(unsigned int total_size, | |
978 | struct xt_table *table, | |
979 | void __user *userptr) | |
980 | { | |
981 | unsigned int off, num; | |
982 | struct ip6t_entry *e; | |
983 | struct xt_counters *counters; | |
5452e425 | 984 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 985 | int ret = 0; |
5452e425 | 986 | const void *loc_cpu_entry; |
ed1a6f5e PM |
987 | |
988 | counters = alloc_counters(table); | |
989 | if (IS_ERR(counters)) | |
990 | return PTR_ERR(counters); | |
991 | ||
9c547959 PM |
992 | /* choose the copy that is on our node/cpu, ... |
993 | * This choice is lazy (because current thread is | |
994 | * allowed to migrate to another cpu) | |
995 | */ | |
2e4e6a17 | 996 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 997 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
998 | ret = -EFAULT; |
999 | goto free_counters; | |
1000 | } | |
1001 | ||
1002 | /* FIXME: use iterator macros --RR */ | |
1003 | /* ... then go back and fix counters and names */ | |
1004 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
1005 | unsigned int i; | |
5452e425 JE |
1006 | const struct ip6t_entry_match *m; |
1007 | const struct ip6t_entry_target *t; | |
1da177e4 | 1008 | |
31836064 | 1009 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
1010 | if (copy_to_user(userptr + off |
1011 | + offsetof(struct ip6t_entry, counters), | |
1012 | &counters[num], | |
1013 | sizeof(counters[num])) != 0) { | |
1014 | ret = -EFAULT; | |
1015 | goto free_counters; | |
1016 | } | |
1017 | ||
1018 | for (i = sizeof(struct ip6t_entry); | |
1019 | i < e->target_offset; | |
1020 | i += m->u.match_size) { | |
1021 | m = (void *)e + i; | |
1022 | ||
1023 | if (copy_to_user(userptr + off + i | |
1024 | + offsetof(struct ip6t_entry_match, | |
1025 | u.user.name), | |
1026 | m->u.kernel.match->name, | |
1027 | strlen(m->u.kernel.match->name)+1) | |
1028 | != 0) { | |
1029 | ret = -EFAULT; | |
1030 | goto free_counters; | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | t = ip6t_get_target(e); | |
1035 | if (copy_to_user(userptr + off + e->target_offset | |
1036 | + offsetof(struct ip6t_entry_target, | |
1037 | u.user.name), | |
1038 | t->u.kernel.target->name, | |
1039 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1040 | ret = -EFAULT; | |
1041 | goto free_counters; | |
1042 | } | |
1043 | } | |
1044 | ||
1045 | free_counters: | |
1046 | vfree(counters); | |
1047 | return ret; | |
1048 | } | |
1049 | ||
3bc3fe5e PM |
1050 | #ifdef CONFIG_COMPAT |
1051 | static void compat_standard_from_user(void *dst, void *src) | |
1052 | { | |
1053 | int v = *(compat_int_t *)src; | |
1054 | ||
1055 | if (v > 0) | |
1056 | v += xt_compat_calc_jump(AF_INET6, v); | |
1057 | memcpy(dst, &v, sizeof(v)); | |
1058 | } | |
1059 | ||
1060 | static int compat_standard_to_user(void __user *dst, void *src) | |
1061 | { | |
1062 | compat_int_t cv = *(int *)src; | |
1063 | ||
1064 | if (cv > 0) | |
1065 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1066 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1067 | } | |
1068 | ||
1069 | static inline int | |
1070 | compat_calc_match(struct ip6t_entry_match *m, int *size) | |
1071 | { | |
1072 | *size += xt_compat_match_offset(m->u.kernel.match); | |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | static int compat_calc_entry(struct ip6t_entry *e, | |
1077 | const struct xt_table_info *info, | |
1078 | void *base, struct xt_table_info *newinfo) | |
1079 | { | |
1080 | struct ip6t_entry_target *t; | |
1081 | unsigned int entry_offset; | |
1082 | int off, i, ret; | |
1083 | ||
1084 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1085 | entry_offset = (void *)e - base; | |
1086 | IP6T_MATCH_ITERATE(e, compat_calc_match, &off); | |
1087 | t = ip6t_get_target(e); | |
1088 | off += xt_compat_target_offset(t->u.kernel.target); | |
1089 | newinfo->size -= off; | |
1090 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1091 | if (ret) | |
1092 | return ret; | |
1093 | ||
1094 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1095 | if (info->hook_entry[i] && | |
1096 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1097 | newinfo->hook_entry[i] -= off; | |
1098 | if (info->underflow[i] && | |
1099 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1100 | newinfo->underflow[i] -= off; | |
1101 | } | |
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | static int compat_table_info(const struct xt_table_info *info, | |
1106 | struct xt_table_info *newinfo) | |
1107 | { | |
1108 | void *loc_cpu_entry; | |
1109 | ||
1110 | if (!newinfo || !info) | |
1111 | return -EINVAL; | |
1112 | ||
1113 | /* we dont care about newinfo->entries[] */ | |
1114 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1115 | newinfo->initial_entries = 0; | |
1116 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
1117 | return IP6T_ENTRY_ITERATE(loc_cpu_entry, info->size, | |
1118 | compat_calc_entry, info, loc_cpu_entry, | |
1119 | newinfo); | |
1120 | } | |
1121 | #endif | |
1122 | ||
336b517f | 1123 | static int get_info(struct net *net, void __user *user, int *len, int compat) |
433665c9 PM |
1124 | { |
1125 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1126 | struct xt_table *t; | |
1127 | int ret; | |
1128 | ||
1129 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1130 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1131 | sizeof(struct ip6t_getinfo)); |
1132 | return -EINVAL; | |
1133 | } | |
1134 | ||
1135 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1136 | return -EFAULT; | |
1137 | ||
1138 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; | |
3bc3fe5e PM |
1139 | #ifdef CONFIG_COMPAT |
1140 | if (compat) | |
1141 | xt_compat_lock(AF_INET6); | |
1142 | #endif | |
336b517f | 1143 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 PM |
1144 | "ip6table_%s", name); |
1145 | if (t && !IS_ERR(t)) { | |
1146 | struct ip6t_getinfo info; | |
5452e425 | 1147 | const struct xt_table_info *private = t->private; |
433665c9 | 1148 | |
3bc3fe5e PM |
1149 | #ifdef CONFIG_COMPAT |
1150 | if (compat) { | |
1151 | struct xt_table_info tmp; | |
1152 | ret = compat_table_info(private, &tmp); | |
1153 | xt_compat_flush_offsets(AF_INET6); | |
1154 | private = &tmp; | |
1155 | } | |
1156 | #endif | |
433665c9 PM |
1157 | info.valid_hooks = t->valid_hooks; |
1158 | memcpy(info.hook_entry, private->hook_entry, | |
1159 | sizeof(info.hook_entry)); | |
1160 | memcpy(info.underflow, private->underflow, | |
1161 | sizeof(info.underflow)); | |
1162 | info.num_entries = private->number; | |
1163 | info.size = private->size; | |
b5dd674b | 1164 | strcpy(info.name, name); |
433665c9 PM |
1165 | |
1166 | if (copy_to_user(user, &info, *len) != 0) | |
1167 | ret = -EFAULT; | |
1168 | else | |
1169 | ret = 0; | |
1170 | ||
1171 | xt_table_unlock(t); | |
1172 | module_put(t->me); | |
1173 | } else | |
1174 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1175 | #ifdef CONFIG_COMPAT |
1176 | if (compat) | |
1177 | xt_compat_unlock(AF_INET6); | |
1178 | #endif | |
433665c9 PM |
1179 | return ret; |
1180 | } | |
1181 | ||
1da177e4 | 1182 | static int |
336b517f | 1183 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, int *len) |
1da177e4 LT |
1184 | { |
1185 | int ret; | |
d924357c | 1186 | struct ip6t_get_entries get; |
2e4e6a17 | 1187 | struct xt_table *t; |
1da177e4 | 1188 | |
d924357c | 1189 | if (*len < sizeof(get)) { |
c9d8fe13 | 1190 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1191 | return -EINVAL; |
1192 | } | |
1193 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1194 | return -EFAULT; | |
1195 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1196 | duprintf("get_entries: %u != %zu\n", |
1197 | *len, sizeof(get) + get.size); | |
d924357c PM |
1198 | return -EINVAL; |
1199 | } | |
1200 | ||
336b517f | 1201 | t = xt_find_table_lock(net, AF_INET6, get.name); |
6b7d31fc | 1202 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
1203 | struct xt_table_info *private = t->private; |
1204 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1205 | if (get.size == private->size) |
2e4e6a17 | 1206 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1207 | t, uptr->entrytable); |
1208 | else { | |
1209 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1210 | private->size, get.size); |
544473c1 | 1211 | ret = -EAGAIN; |
1da177e4 | 1212 | } |
6b7d31fc | 1213 | module_put(t->me); |
2e4e6a17 | 1214 | xt_table_unlock(t); |
1da177e4 | 1215 | } else |
6b7d31fc | 1216 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1217 | |
1218 | return ret; | |
1219 | } | |
1220 | ||
1221 | static int | |
336b517f | 1222 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1223 | struct xt_table_info *newinfo, unsigned int num_counters, |
1224 | void __user *counters_ptr) | |
1da177e4 LT |
1225 | { |
1226 | int ret; | |
2e4e6a17 | 1227 | struct xt_table *t; |
3bc3fe5e | 1228 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1229 | struct xt_counters *counters; |
5452e425 | 1230 | const void *loc_cpu_old_entry; |
1da177e4 | 1231 | |
3bc3fe5e PM |
1232 | ret = 0; |
1233 | counters = vmalloc_node(num_counters * sizeof(struct xt_counters), | |
3b84e92b | 1234 | numa_node_id()); |
1da177e4 LT |
1235 | if (!counters) { |
1236 | ret = -ENOMEM; | |
3bc3fe5e | 1237 | goto out; |
1da177e4 | 1238 | } |
1da177e4 | 1239 | |
336b517f | 1240 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1241 | "ip6table_%s", name); |
6b7d31fc HW |
1242 | if (!t || IS_ERR(t)) { |
1243 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1244 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1245 | } |
1da177e4 LT |
1246 | |
1247 | /* You lied! */ | |
3bc3fe5e | 1248 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1249 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1250 | valid_hooks, t->valid_hooks); |
1da177e4 | 1251 | ret = -EINVAL; |
6b7d31fc | 1252 | goto put_module; |
1da177e4 LT |
1253 | } |
1254 | ||
3bc3fe5e | 1255 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1256 | if (!oldinfo) |
1257 | goto put_module; | |
1258 | ||
1259 | /* Update module usage count based on number of rules */ | |
1260 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1261 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1262 | if ((oldinfo->number > oldinfo->initial_entries) || |
1263 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1264 | module_put(t->me); |
1265 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1266 | (newinfo->number <= oldinfo->initial_entries)) | |
1267 | module_put(t->me); | |
1268 | ||
1269 | /* Get the old counters. */ | |
1270 | get_counters(oldinfo, counters); | |
1271 | /* Decrease module usage counts and free resource */ | |
31836064 | 1272 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
3bc3fe5e PM |
1273 | IP6T_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry, |
1274 | NULL); | |
2e4e6a17 | 1275 | xt_free_table_info(oldinfo); |
3bc3fe5e PM |
1276 | if (copy_to_user(counters_ptr, counters, |
1277 | sizeof(struct xt_counters) * num_counters) != 0) | |
1da177e4 LT |
1278 | ret = -EFAULT; |
1279 | vfree(counters); | |
2e4e6a17 | 1280 | xt_table_unlock(t); |
1da177e4 LT |
1281 | return ret; |
1282 | ||
1283 | put_module: | |
1284 | module_put(t->me); | |
2e4e6a17 | 1285 | xt_table_unlock(t); |
1da177e4 | 1286 | free_newinfo_counters_untrans: |
1da177e4 | 1287 | vfree(counters); |
3bc3fe5e PM |
1288 | out: |
1289 | return ret; | |
1290 | } | |
1291 | ||
1292 | static int | |
336b517f | 1293 | do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1294 | { |
1295 | int ret; | |
1296 | struct ip6t_replace tmp; | |
1297 | struct xt_table_info *newinfo; | |
1298 | void *loc_cpu_entry; | |
1299 | ||
1300 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1301 | return -EFAULT; | |
1302 | ||
1303 | /* overflow check */ | |
1304 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1305 | return -ENOMEM; | |
1306 | ||
1307 | newinfo = xt_alloc_table_info(tmp.size); | |
1308 | if (!newinfo) | |
1309 | return -ENOMEM; | |
1310 | ||
1311 | /* choose the copy that is on our node/cpu */ | |
1312 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1313 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1314 | tmp.size) != 0) { | |
1315 | ret = -EFAULT; | |
1316 | goto free_newinfo; | |
1317 | } | |
1318 | ||
1319 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
1320 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, | |
1321 | tmp.hook_entry, tmp.underflow); | |
1322 | if (ret != 0) | |
1323 | goto free_newinfo; | |
1324 | ||
1325 | duprintf("ip_tables: Translated table\n"); | |
1326 | ||
336b517f | 1327 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1328 | tmp.num_counters, tmp.counters); |
1329 | if (ret) | |
1330 | goto free_newinfo_untrans; | |
1331 | return 0; | |
1332 | ||
1333 | free_newinfo_untrans: | |
1334 | IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); | |
1da177e4 | 1335 | free_newinfo: |
2e4e6a17 | 1336 | xt_free_table_info(newinfo); |
1da177e4 LT |
1337 | return ret; |
1338 | } | |
1339 | ||
1340 | /* We're lazy, and add to the first CPU; overflow works its fey magic | |
1341 | * and everything is OK. */ | |
1342 | static inline int | |
1343 | add_counter_to_entry(struct ip6t_entry *e, | |
2e4e6a17 | 1344 | const struct xt_counters addme[], |
1da177e4 LT |
1345 | unsigned int *i) |
1346 | { | |
1347 | #if 0 | |
1348 | duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n", | |
1349 | *i, | |
1350 | (long unsigned int)e->counters.pcnt, | |
1351 | (long unsigned int)e->counters.bcnt, | |
1352 | (long unsigned int)addme[*i].pcnt, | |
1353 | (long unsigned int)addme[*i].bcnt); | |
1354 | #endif | |
1355 | ||
1356 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1357 | ||
1358 | (*i)++; | |
1359 | return 0; | |
1360 | } | |
1361 | ||
1362 | static int | |
336b517f AD |
1363 | do_add_counters(struct net *net, void __user *user, unsigned int len, |
1364 | int compat) | |
1da177e4 LT |
1365 | { |
1366 | unsigned int i; | |
3bc3fe5e PM |
1367 | struct xt_counters_info tmp; |
1368 | struct xt_counters *paddc; | |
1369 | unsigned int num_counters; | |
1370 | char *name; | |
1371 | int size; | |
1372 | void *ptmp; | |
2e4e6a17 | 1373 | struct xt_table *t; |
5452e425 | 1374 | const struct xt_table_info *private; |
6b7d31fc | 1375 | int ret = 0; |
5452e425 | 1376 | const void *loc_cpu_entry; |
3bc3fe5e PM |
1377 | #ifdef CONFIG_COMPAT |
1378 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1379 | |
3bc3fe5e PM |
1380 | if (compat) { |
1381 | ptmp = &compat_tmp; | |
1382 | size = sizeof(struct compat_xt_counters_info); | |
1383 | } else | |
1384 | #endif | |
1385 | { | |
1386 | ptmp = &tmp; | |
1387 | size = sizeof(struct xt_counters_info); | |
1388 | } | |
1389 | ||
1390 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1391 | return -EFAULT; |
1392 | ||
3bc3fe5e PM |
1393 | #ifdef CONFIG_COMPAT |
1394 | if (compat) { | |
1395 | num_counters = compat_tmp.num_counters; | |
1396 | name = compat_tmp.name; | |
1397 | } else | |
1398 | #endif | |
1399 | { | |
1400 | num_counters = tmp.num_counters; | |
1401 | name = tmp.name; | |
1402 | } | |
1403 | ||
1404 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1405 | return -EINVAL; |
1406 | ||
3bc3fe5e | 1407 | paddc = vmalloc_node(len - size, numa_node_id()); |
1da177e4 LT |
1408 | if (!paddc) |
1409 | return -ENOMEM; | |
1410 | ||
3bc3fe5e | 1411 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1412 | ret = -EFAULT; |
1413 | goto free; | |
1414 | } | |
1415 | ||
336b517f | 1416 | t = xt_find_table_lock(net, AF_INET6, name); |
6b7d31fc HW |
1417 | if (!t || IS_ERR(t)) { |
1418 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1419 | goto free; |
6b7d31fc | 1420 | } |
1da177e4 LT |
1421 | |
1422 | write_lock_bh(&t->lock); | |
2e4e6a17 | 1423 | private = t->private; |
3bc3fe5e | 1424 | if (private->number != num_counters) { |
1da177e4 LT |
1425 | ret = -EINVAL; |
1426 | goto unlock_up_free; | |
1427 | } | |
1428 | ||
1429 | i = 0; | |
31836064 | 1430 | /* Choose the copy that is on our node */ |
da4d0f6b | 1431 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 1432 | IP6T_ENTRY_ITERATE(loc_cpu_entry, |
2e4e6a17 | 1433 | private->size, |
1da177e4 | 1434 | add_counter_to_entry, |
3bc3fe5e | 1435 | paddc, |
1da177e4 LT |
1436 | &i); |
1437 | unlock_up_free: | |
1438 | write_unlock_bh(&t->lock); | |
2e4e6a17 | 1439 | xt_table_unlock(t); |
6b7d31fc | 1440 | module_put(t->me); |
1da177e4 LT |
1441 | free: |
1442 | vfree(paddc); | |
1443 | ||
1444 | return ret; | |
1445 | } | |
1446 | ||
3bc3fe5e PM |
1447 | #ifdef CONFIG_COMPAT |
1448 | struct compat_ip6t_replace { | |
1449 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1450 | u32 valid_hooks; | |
1451 | u32 num_entries; | |
1452 | u32 size; | |
1453 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1454 | u32 underflow[NF_INET_NUMHOOKS]; | |
1455 | u32 num_counters; | |
1456 | compat_uptr_t counters; /* struct ip6t_counters * */ | |
1457 | struct compat_ip6t_entry entries[0]; | |
1458 | }; | |
1459 | ||
1460 | static int | |
1461 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1462 | unsigned int *size, struct xt_counters *counters, |
3bc3fe5e PM |
1463 | unsigned int *i) |
1464 | { | |
1465 | struct ip6t_entry_target *t; | |
1466 | struct compat_ip6t_entry __user *ce; | |
1467 | u_int16_t target_offset, next_offset; | |
1468 | compat_uint_t origsize; | |
1469 | int ret; | |
1470 | ||
1471 | ret = -EFAULT; | |
1472 | origsize = *size; | |
1473 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
1474 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry))) | |
1475 | goto out; | |
1476 | ||
1477 | if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i]))) | |
1478 | goto out; | |
1479 | ||
1480 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1481 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1482 | ||
1483 | ret = IP6T_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size); | |
1484 | target_offset = e->target_offset - (origsize - *size); | |
1485 | if (ret) | |
1486 | goto out; | |
1487 | t = ip6t_get_target(e); | |
1488 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1489 | if (ret) | |
1490 | goto out; | |
1491 | ret = -EFAULT; | |
1492 | next_offset = e->next_offset - (origsize - *size); | |
1493 | if (put_user(target_offset, &ce->target_offset)) | |
1494 | goto out; | |
1495 | if (put_user(next_offset, &ce->next_offset)) | |
1496 | goto out; | |
1497 | ||
1498 | (*i)++; | |
1499 | return 0; | |
1500 | out: | |
1501 | return ret; | |
1502 | } | |
1503 | ||
022748a9 | 1504 | static int |
3bc3fe5e PM |
1505 | compat_find_calc_match(struct ip6t_entry_match *m, |
1506 | const char *name, | |
1507 | const struct ip6t_ip6 *ipv6, | |
1508 | unsigned int hookmask, | |
b0a6363c | 1509 | int *size, unsigned int *i) |
3bc3fe5e PM |
1510 | { |
1511 | struct xt_match *match; | |
1512 | ||
1513 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, | |
1514 | m->u.user.revision), | |
1515 | "ip6t_%s", m->u.user.name); | |
1516 | if (IS_ERR(match) || !match) { | |
1517 | duprintf("compat_check_calc_match: `%s' not found\n", | |
1518 | m->u.user.name); | |
1519 | return match ? PTR_ERR(match) : -ENOENT; | |
1520 | } | |
1521 | m->u.kernel.match = match; | |
1522 | *size += xt_compat_match_offset(match); | |
1523 | ||
1524 | (*i)++; | |
1525 | return 0; | |
1526 | } | |
1527 | ||
022748a9 | 1528 | static int |
3bc3fe5e PM |
1529 | compat_release_match(struct ip6t_entry_match *m, unsigned int *i) |
1530 | { | |
1531 | if (i && (*i)-- == 0) | |
1532 | return 1; | |
1533 | ||
1534 | module_put(m->u.kernel.match->me); | |
1535 | return 0; | |
1536 | } | |
1537 | ||
022748a9 | 1538 | static int |
3bc3fe5e PM |
1539 | compat_release_entry(struct compat_ip6t_entry *e, unsigned int *i) |
1540 | { | |
1541 | struct ip6t_entry_target *t; | |
1542 | ||
1543 | if (i && (*i)-- == 0) | |
1544 | return 1; | |
1545 | ||
1546 | /* Cleanup all matches */ | |
1547 | COMPAT_IP6T_MATCH_ITERATE(e, compat_release_match, NULL); | |
1548 | t = compat_ip6t_get_target(e); | |
1549 | module_put(t->u.kernel.target->me); | |
1550 | return 0; | |
1551 | } | |
1552 | ||
022748a9 | 1553 | static int |
3bc3fe5e PM |
1554 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1555 | struct xt_table_info *newinfo, | |
1556 | unsigned int *size, | |
1557 | unsigned char *base, | |
1558 | unsigned char *limit, | |
1559 | unsigned int *hook_entries, | |
1560 | unsigned int *underflows, | |
1561 | unsigned int *i, | |
1562 | const char *name) | |
1563 | { | |
1564 | struct ip6t_entry_target *t; | |
1565 | struct xt_target *target; | |
1566 | unsigned int entry_offset; | |
b0a6363c PM |
1567 | unsigned int j; |
1568 | int ret, off, h; | |
3bc3fe5e PM |
1569 | |
1570 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
1571 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 | |
1572 | || (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
1573 | duprintf("Bad offset %p, limit = %p\n", e, limit); | |
1574 | return -EINVAL; | |
1575 | } | |
1576 | ||
1577 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1578 | sizeof(struct compat_xt_entry_target)) { | |
1579 | duprintf("checking: element %p size %u\n", | |
1580 | e, e->next_offset); | |
1581 | return -EINVAL; | |
1582 | } | |
1583 | ||
1584 | /* For purposes of check_entry casting the compat entry is fine */ | |
1585 | ret = check_entry((struct ip6t_entry *)e, name); | |
1586 | if (ret) | |
1587 | return ret; | |
1588 | ||
1589 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1590 | entry_offset = (void *)e - (void *)base; | |
1591 | j = 0; | |
1592 | ret = COMPAT_IP6T_MATCH_ITERATE(e, compat_find_calc_match, name, | |
1593 | &e->ipv6, e->comefrom, &off, &j); | |
1594 | if (ret != 0) | |
1595 | goto release_matches; | |
1596 | ||
1597 | t = compat_ip6t_get_target(e); | |
1598 | target = try_then_request_module(xt_find_target(AF_INET6, | |
1599 | t->u.user.name, | |
1600 | t->u.user.revision), | |
1601 | "ip6t_%s", t->u.user.name); | |
1602 | if (IS_ERR(target) || !target) { | |
1603 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", | |
1604 | t->u.user.name); | |
1605 | ret = target ? PTR_ERR(target) : -ENOENT; | |
1606 | goto release_matches; | |
1607 | } | |
1608 | t->u.kernel.target = target; | |
1609 | ||
1610 | off += xt_compat_target_offset(target); | |
1611 | *size += off; | |
1612 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1613 | if (ret) | |
1614 | goto out; | |
1615 | ||
1616 | /* Check hooks & underflows */ | |
1617 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1618 | if ((unsigned char *)e - base == hook_entries[h]) | |
1619 | newinfo->hook_entry[h] = hook_entries[h]; | |
1620 | if ((unsigned char *)e - base == underflows[h]) | |
1621 | newinfo->underflow[h] = underflows[h]; | |
1622 | } | |
1623 | ||
1624 | /* Clear counters and comefrom */ | |
1625 | memset(&e->counters, 0, sizeof(e->counters)); | |
1626 | e->comefrom = 0; | |
1627 | ||
1628 | (*i)++; | |
1629 | return 0; | |
1630 | ||
1631 | out: | |
1632 | module_put(t->u.kernel.target->me); | |
1633 | release_matches: | |
1634 | IP6T_MATCH_ITERATE(e, compat_release_match, &j); | |
1635 | return ret; | |
1636 | } | |
1637 | ||
1638 | static int | |
1639 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1640 | unsigned int *size, const char *name, | |
1641 | struct xt_table_info *newinfo, unsigned char *base) | |
1642 | { | |
1643 | struct ip6t_entry_target *t; | |
1644 | struct xt_target *target; | |
1645 | struct ip6t_entry *de; | |
1646 | unsigned int origsize; | |
1647 | int ret, h; | |
1648 | ||
1649 | ret = 0; | |
1650 | origsize = *size; | |
1651 | de = (struct ip6t_entry *)*dstptr; | |
1652 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1653 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1654 | ||
1655 | *dstptr += sizeof(struct ip6t_entry); | |
1656 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1657 | ||
1658 | ret = COMPAT_IP6T_MATCH_ITERATE(e, xt_compat_match_from_user, | |
1659 | dstptr, size); | |
1660 | if (ret) | |
1661 | return ret; | |
1662 | de->target_offset = e->target_offset - (origsize - *size); | |
1663 | t = compat_ip6t_get_target(e); | |
1664 | target = t->u.kernel.target; | |
1665 | xt_compat_target_from_user(t, dstptr, size); | |
1666 | ||
1667 | de->next_offset = e->next_offset - (origsize - *size); | |
1668 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1669 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1670 | newinfo->hook_entry[h] -= origsize - *size; | |
1671 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1672 | newinfo->underflow[h] -= origsize - *size; | |
1673 | } | |
1674 | return ret; | |
1675 | } | |
1676 | ||
022748a9 | 1677 | static int compat_check_entry(struct ip6t_entry *e, const char *name, |
3bc3fe5e PM |
1678 | unsigned int *i) |
1679 | { | |
b0a6363c PM |
1680 | unsigned int j; |
1681 | int ret; | |
9b4fce7a | 1682 | struct xt_mtchk_param mtpar; |
3bc3fe5e PM |
1683 | |
1684 | j = 0; | |
9b4fce7a JE |
1685 | mtpar.table = name; |
1686 | mtpar.entryinfo = &e->ipv6; | |
1687 | mtpar.hook_mask = e->comefrom; | |
1688 | ret = IP6T_MATCH_ITERATE(e, check_match, &mtpar, &j); | |
3bc3fe5e PM |
1689 | if (ret) |
1690 | goto cleanup_matches; | |
1691 | ||
1692 | ret = check_target(e, name); | |
1693 | if (ret) | |
1694 | goto cleanup_matches; | |
1695 | ||
1696 | (*i)++; | |
1697 | return 0; | |
1698 | ||
1699 | cleanup_matches: | |
1700 | IP6T_MATCH_ITERATE(e, cleanup_match, &j); | |
1701 | return ret; | |
1702 | } | |
1703 | ||
1704 | static int | |
1705 | translate_compat_table(const char *name, | |
1706 | unsigned int valid_hooks, | |
1707 | struct xt_table_info **pinfo, | |
1708 | void **pentry0, | |
1709 | unsigned int total_size, | |
1710 | unsigned int number, | |
1711 | unsigned int *hook_entries, | |
1712 | unsigned int *underflows) | |
1713 | { | |
1714 | unsigned int i, j; | |
1715 | struct xt_table_info *newinfo, *info; | |
1716 | void *pos, *entry0, *entry1; | |
1717 | unsigned int size; | |
1718 | int ret; | |
1719 | ||
1720 | info = *pinfo; | |
1721 | entry0 = *pentry0; | |
1722 | size = total_size; | |
1723 | info->number = number; | |
1724 | ||
1725 | /* Init all hooks to impossible value. */ | |
1726 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1727 | info->hook_entry[i] = 0xFFFFFFFF; | |
1728 | info->underflow[i] = 0xFFFFFFFF; | |
1729 | } | |
1730 | ||
1731 | duprintf("translate_compat_table: size %u\n", info->size); | |
1732 | j = 0; | |
1733 | xt_compat_lock(AF_INET6); | |
1734 | /* Walk through entries, checking offsets. */ | |
1735 | ret = COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size, | |
1736 | check_compat_entry_size_and_hooks, | |
1737 | info, &size, entry0, | |
1738 | entry0 + total_size, | |
1739 | hook_entries, underflows, &j, name); | |
1740 | if (ret != 0) | |
1741 | goto out_unlock; | |
1742 | ||
1743 | ret = -EINVAL; | |
1744 | if (j != number) { | |
1745 | duprintf("translate_compat_table: %u not %u entries\n", | |
1746 | j, number); | |
1747 | goto out_unlock; | |
1748 | } | |
1749 | ||
1750 | /* Check hooks all assigned */ | |
1751 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1752 | /* Only hooks which are valid */ | |
1753 | if (!(valid_hooks & (1 << i))) | |
1754 | continue; | |
1755 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1756 | duprintf("Invalid hook entry %u %u\n", | |
1757 | i, hook_entries[i]); | |
1758 | goto out_unlock; | |
1759 | } | |
1760 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1761 | duprintf("Invalid underflow %u %u\n", | |
1762 | i, underflows[i]); | |
1763 | goto out_unlock; | |
1764 | } | |
1765 | } | |
1766 | ||
1767 | ret = -ENOMEM; | |
1768 | newinfo = xt_alloc_table_info(size); | |
1769 | if (!newinfo) | |
1770 | goto out_unlock; | |
1771 | ||
1772 | newinfo->number = number; | |
1773 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1774 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1775 | newinfo->underflow[i] = info->underflow[i]; | |
1776 | } | |
1777 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1778 | pos = entry1; | |
1779 | size = total_size; | |
1780 | ret = COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size, | |
1781 | compat_copy_entry_from_user, | |
1782 | &pos, &size, name, newinfo, entry1); | |
1783 | xt_compat_flush_offsets(AF_INET6); | |
1784 | xt_compat_unlock(AF_INET6); | |
1785 | if (ret) | |
1786 | goto free_newinfo; | |
1787 | ||
1788 | ret = -ELOOP; | |
1789 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1790 | goto free_newinfo; | |
1791 | ||
1792 | i = 0; | |
1793 | ret = IP6T_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry, | |
1794 | name, &i); | |
1795 | if (ret) { | |
1796 | j -= i; | |
1797 | COMPAT_IP6T_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i, | |
1798 | compat_release_entry, &j); | |
1799 | IP6T_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i); | |
1800 | xt_free_table_info(newinfo); | |
1801 | return ret; | |
1802 | } | |
1803 | ||
1804 | /* And one copy for every other CPU */ | |
1805 | for_each_possible_cpu(i) | |
1806 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1807 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1808 | ||
1809 | *pinfo = newinfo; | |
1810 | *pentry0 = entry1; | |
1811 | xt_free_table_info(info); | |
1812 | return 0; | |
1813 | ||
1814 | free_newinfo: | |
1815 | xt_free_table_info(newinfo); | |
1816 | out: | |
1817 | COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j); | |
1818 | return ret; | |
1819 | out_unlock: | |
1820 | xt_compat_flush_offsets(AF_INET6); | |
1821 | xt_compat_unlock(AF_INET6); | |
1822 | goto out; | |
1823 | } | |
1824 | ||
1825 | static int | |
336b517f | 1826 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1827 | { |
1828 | int ret; | |
1829 | struct compat_ip6t_replace tmp; | |
1830 | struct xt_table_info *newinfo; | |
1831 | void *loc_cpu_entry; | |
1832 | ||
1833 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1834 | return -EFAULT; | |
1835 | ||
1836 | /* overflow check */ | |
1837 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1838 | return -ENOMEM; | |
1839 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1840 | return -ENOMEM; | |
1841 | ||
1842 | newinfo = xt_alloc_table_info(tmp.size); | |
1843 | if (!newinfo) | |
1844 | return -ENOMEM; | |
1845 | ||
9c547959 | 1846 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1847 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1848 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1849 | tmp.size) != 0) { | |
1850 | ret = -EFAULT; | |
1851 | goto free_newinfo; | |
1852 | } | |
1853 | ||
1854 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, | |
1855 | &newinfo, &loc_cpu_entry, tmp.size, | |
1856 | tmp.num_entries, tmp.hook_entry, | |
1857 | tmp.underflow); | |
1858 | if (ret != 0) | |
1859 | goto free_newinfo; | |
1860 | ||
1861 | duprintf("compat_do_replace: Translated table\n"); | |
1862 | ||
336b517f | 1863 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1864 | tmp.num_counters, compat_ptr(tmp.counters)); |
1865 | if (ret) | |
1866 | goto free_newinfo_untrans; | |
1867 | return 0; | |
1868 | ||
1869 | free_newinfo_untrans: | |
1870 | IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); | |
1871 | free_newinfo: | |
1872 | xt_free_table_info(newinfo); | |
1873 | return ret; | |
1874 | } | |
1875 | ||
1876 | static int | |
1877 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1878 | unsigned int len) | |
1879 | { | |
1880 | int ret; | |
1881 | ||
1882 | if (!capable(CAP_NET_ADMIN)) | |
1883 | return -EPERM; | |
1884 | ||
1885 | switch (cmd) { | |
1886 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1887 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1888 | break; |
1889 | ||
1890 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1891 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1892 | break; |
1893 | ||
1894 | default: | |
1895 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1896 | ret = -EINVAL; | |
1897 | } | |
1898 | ||
1899 | return ret; | |
1900 | } | |
1901 | ||
1902 | struct compat_ip6t_get_entries { | |
1903 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1904 | compat_uint_t size; | |
1905 | struct compat_ip6t_entry entrytable[0]; | |
1906 | }; | |
1907 | ||
1908 | static int | |
1909 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1910 | void __user *userptr) | |
1911 | { | |
1912 | struct xt_counters *counters; | |
5452e425 | 1913 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1914 | void __user *pos; |
1915 | unsigned int size; | |
1916 | int ret = 0; | |
5452e425 | 1917 | const void *loc_cpu_entry; |
3bc3fe5e PM |
1918 | unsigned int i = 0; |
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; | |
1931 | ret = IP6T_ENTRY_ITERATE(loc_cpu_entry, total_size, | |
1932 | compat_copy_entry_to_user, | |
1933 | &pos, &size, counters, &i); | |
1934 | ||
1935 | vfree(counters); | |
1936 | return ret; | |
1937 | } | |
1938 | ||
1939 | static int | |
336b517f AD |
1940 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1941 | int *len) | |
3bc3fe5e PM |
1942 | { |
1943 | int ret; | |
1944 | struct compat_ip6t_get_entries get; | |
1945 | struct xt_table *t; | |
1946 | ||
1947 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1948 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1949 | return -EINVAL; |
1950 | } | |
1951 | ||
1952 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1953 | return -EFAULT; | |
1954 | ||
1955 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1956 | duprintf("compat_get_entries: %u != %zu\n", |
1957 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1958 | return -EINVAL; |
1959 | } | |
1960 | ||
1961 | xt_compat_lock(AF_INET6); | |
336b517f | 1962 | t = xt_find_table_lock(net, AF_INET6, get.name); |
3bc3fe5e | 1963 | if (t && !IS_ERR(t)) { |
5452e425 | 1964 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1965 | struct xt_table_info info; |
9c547959 | 1966 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1967 | ret = compat_table_info(private, &info); |
1968 | if (!ret && get.size == info.size) { | |
1969 | ret = compat_copy_entries_to_user(private->size, | |
1970 | t, uptr->entrytable); | |
1971 | } else if (!ret) { | |
1972 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1973 | private->size, get.size); |
544473c1 | 1974 | ret = -EAGAIN; |
3bc3fe5e PM |
1975 | } |
1976 | xt_compat_flush_offsets(AF_INET6); | |
1977 | module_put(t->me); | |
1978 | xt_table_unlock(t); | |
1979 | } else | |
1980 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1981 | ||
1982 | xt_compat_unlock(AF_INET6); | |
1983 | return ret; | |
1984 | } | |
1985 | ||
1986 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
1987 | ||
1988 | static int | |
1989 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1990 | { | |
1991 | int ret; | |
1992 | ||
1993 | if (!capable(CAP_NET_ADMIN)) | |
1994 | return -EPERM; | |
1995 | ||
1996 | switch (cmd) { | |
1997 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 1998 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1999 | break; |
2000 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 2001 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
2002 | break; |
2003 | default: | |
2004 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
2005 | } | |
2006 | return ret; | |
2007 | } | |
2008 | #endif | |
2009 | ||
1da177e4 LT |
2010 | static int |
2011 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2012 | { | |
2013 | int ret; | |
2014 | ||
2015 | if (!capable(CAP_NET_ADMIN)) | |
2016 | return -EPERM; | |
2017 | ||
2018 | switch (cmd) { | |
2019 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2020 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2021 | break; |
2022 | ||
2023 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2024 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2025 | break; |
2026 | ||
2027 | default: | |
2028 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2029 | ret = -EINVAL; | |
2030 | } | |
2031 | ||
2032 | return ret; | |
2033 | } | |
2034 | ||
2035 | static int | |
2036 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2037 | { | |
2038 | int ret; | |
2039 | ||
2040 | if (!capable(CAP_NET_ADMIN)) | |
2041 | return -EPERM; | |
2042 | ||
2043 | switch (cmd) { | |
433665c9 | 2044 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2045 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2046 | break; |
1da177e4 | 2047 | |
d924357c | 2048 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2049 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2050 | break; |
1da177e4 | 2051 | |
6b7d31fc HW |
2052 | case IP6T_SO_GET_REVISION_MATCH: |
2053 | case IP6T_SO_GET_REVISION_TARGET: { | |
2054 | struct ip6t_get_revision rev; | |
2e4e6a17 | 2055 | int target; |
6b7d31fc HW |
2056 | |
2057 | if (*len != sizeof(rev)) { | |
2058 | ret = -EINVAL; | |
2059 | break; | |
2060 | } | |
2061 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2062 | ret = -EFAULT; | |
2063 | break; | |
2064 | } | |
2065 | ||
2066 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2067 | target = 1; |
6b7d31fc | 2068 | else |
2e4e6a17 | 2069 | target = 0; |
6b7d31fc | 2070 | |
2e4e6a17 HW |
2071 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2072 | rev.revision, | |
2073 | target, &ret), | |
6b7d31fc HW |
2074 | "ip6t_%s", rev.name); |
2075 | break; | |
2076 | } | |
2077 | ||
1da177e4 LT |
2078 | default: |
2079 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2080 | ret = -EINVAL; | |
2081 | } | |
2082 | ||
2083 | return ret; | |
2084 | } | |
2085 | ||
336b517f AD |
2086 | struct xt_table *ip6t_register_table(struct net *net, struct xt_table *table, |
2087 | const struct ip6t_replace *repl) | |
1da177e4 LT |
2088 | { |
2089 | int ret; | |
2e4e6a17 | 2090 | struct xt_table_info *newinfo; |
259d4e41 | 2091 | struct xt_table_info bootstrap |
1da177e4 | 2092 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2093 | void *loc_cpu_entry; |
a98da11d | 2094 | struct xt_table *new_table; |
1da177e4 | 2095 | |
2e4e6a17 | 2096 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2097 | if (!newinfo) { |
2098 | ret = -ENOMEM; | |
2099 | goto out; | |
2100 | } | |
1da177e4 | 2101 | |
9c547959 | 2102 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2103 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2104 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
2105 | |
2106 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 2107 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
2108 | repl->num_entries, |
2109 | repl->hook_entry, | |
2110 | repl->underflow); | |
44d34e72 AD |
2111 | if (ret != 0) |
2112 | goto out_free; | |
1da177e4 | 2113 | |
336b517f | 2114 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2115 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2116 | ret = PTR_ERR(new_table); |
2117 | goto out_free; | |
1da177e4 | 2118 | } |
44d34e72 | 2119 | return new_table; |
1da177e4 | 2120 | |
44d34e72 AD |
2121 | out_free: |
2122 | xt_free_table_info(newinfo); | |
2123 | out: | |
2124 | return ERR_PTR(ret); | |
1da177e4 LT |
2125 | } |
2126 | ||
2e4e6a17 | 2127 | void ip6t_unregister_table(struct xt_table *table) |
1da177e4 | 2128 | { |
2e4e6a17 | 2129 | struct xt_table_info *private; |
31836064 | 2130 | void *loc_cpu_entry; |
df200969 | 2131 | struct module *table_owner = table->me; |
31836064 | 2132 | |
2e4e6a17 | 2133 | private = xt_unregister_table(table); |
1da177e4 LT |
2134 | |
2135 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
2136 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
2137 | IP6T_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
df200969 AD |
2138 | if (private->number > private->initial_entries) |
2139 | module_put(table_owner); | |
2e4e6a17 | 2140 | xt_free_table_info(private); |
1da177e4 LT |
2141 | } |
2142 | ||
2143 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2144 | static inline bool |
1da177e4 LT |
2145 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2146 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2147 | bool invert) |
1da177e4 LT |
2148 | { |
2149 | return (type == test_type && code >= min_code && code <= max_code) | |
2150 | ^ invert; | |
2151 | } | |
2152 | ||
1d93a9cb | 2153 | static bool |
f7108a20 | 2154 | icmp6_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2155 | { |
5452e425 JE |
2156 | const struct icmp6hdr *ic; |
2157 | struct icmp6hdr _icmph; | |
f7108a20 | 2158 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2159 | |
2160 | /* Must not be a fragment. */ | |
f7108a20 | 2161 | if (par->fragoff != 0) |
1d93a9cb | 2162 | return false; |
1da177e4 | 2163 | |
f7108a20 | 2164 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2165 | if (ic == NULL) { |
2166 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2167 | * can't. Hence, no choice but to drop. |
2168 | */ | |
1da177e4 | 2169 | duprintf("Dropping evil ICMP tinygram.\n"); |
f7108a20 | 2170 | *par->hotdrop = true; |
1d93a9cb | 2171 | return false; |
1da177e4 LT |
2172 | } |
2173 | ||
2174 | return icmp6_type_code_match(icmpinfo->type, | |
2175 | icmpinfo->code[0], | |
2176 | icmpinfo->code[1], | |
2177 | ic->icmp6_type, ic->icmp6_code, | |
2178 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2179 | } | |
2180 | ||
2181 | /* Called when user tries to insert an entry of this type. */ | |
9b4fce7a | 2182 | static bool icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2183 | { |
9b4fce7a | 2184 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2185 | |
7f939713 PM |
2186 | /* Must specify no unknown invflags */ |
2187 | return !(icmpinfo->invflags & ~IP6T_ICMP_INV); | |
1da177e4 LT |
2188 | } |
2189 | ||
2190 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2191 | static struct xt_target ip6t_standard_target __read_mostly = { |
1da177e4 | 2192 | .name = IP6T_STANDARD_TARGET, |
7f939713 | 2193 | .targetsize = sizeof(int), |
a45049c5 | 2194 | .family = AF_INET6, |
3bc3fe5e PM |
2195 | #ifdef CONFIG_COMPAT |
2196 | .compatsize = sizeof(compat_int_t), | |
2197 | .compat_from_user = compat_standard_from_user, | |
2198 | .compat_to_user = compat_standard_to_user, | |
2199 | #endif | |
1da177e4 LT |
2200 | }; |
2201 | ||
9f15c530 | 2202 | static struct xt_target ip6t_error_target __read_mostly = { |
1da177e4 LT |
2203 | .name = IP6T_ERROR_TARGET, |
2204 | .target = ip6t_error, | |
7f939713 | 2205 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, |
a45049c5 | 2206 | .family = AF_INET6, |
1da177e4 LT |
2207 | }; |
2208 | ||
2209 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2210 | .pf = PF_INET6, | |
2211 | .set_optmin = IP6T_BASE_CTL, | |
2212 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2213 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2214 | #ifdef CONFIG_COMPAT |
2215 | .compat_set = compat_do_ip6t_set_ctl, | |
2216 | #endif | |
1da177e4 LT |
2217 | .get_optmin = IP6T_BASE_CTL, |
2218 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2219 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2220 | #ifdef CONFIG_COMPAT |
2221 | .compat_get = compat_do_ip6t_get_ctl, | |
2222 | #endif | |
16fcec35 | 2223 | .owner = THIS_MODULE, |
1da177e4 LT |
2224 | }; |
2225 | ||
9f15c530 | 2226 | static struct xt_match icmp6_matchstruct __read_mostly = { |
1da177e4 | 2227 | .name = "icmp6", |
9c547959 | 2228 | .match = icmp6_match, |
7f939713 PM |
2229 | .matchsize = sizeof(struct ip6t_icmp), |
2230 | .checkentry = icmp6_checkentry, | |
2231 | .proto = IPPROTO_ICMPV6, | |
a45049c5 | 2232 | .family = AF_INET6, |
1da177e4 LT |
2233 | }; |
2234 | ||
3cb609d5 AD |
2235 | static int __net_init ip6_tables_net_init(struct net *net) |
2236 | { | |
2237 | return xt_proto_init(net, AF_INET6); | |
2238 | } | |
2239 | ||
2240 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2241 | { | |
2242 | xt_proto_fini(net, AF_INET6); | |
2243 | } | |
2244 | ||
2245 | static struct pernet_operations ip6_tables_net_ops = { | |
2246 | .init = ip6_tables_net_init, | |
2247 | .exit = ip6_tables_net_exit, | |
2248 | }; | |
2249 | ||
65b4b4e8 | 2250 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2251 | { |
2252 | int ret; | |
2253 | ||
3cb609d5 | 2254 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2255 | if (ret < 0) |
2256 | goto err1; | |
2e4e6a17 | 2257 | |
1da177e4 | 2258 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2259 | ret = xt_register_target(&ip6t_standard_target); |
2260 | if (ret < 0) | |
2261 | goto err2; | |
2262 | ret = xt_register_target(&ip6t_error_target); | |
2263 | if (ret < 0) | |
2264 | goto err3; | |
2265 | ret = xt_register_match(&icmp6_matchstruct); | |
2266 | if (ret < 0) | |
2267 | goto err4; | |
1da177e4 LT |
2268 | |
2269 | /* Register setsockopt */ | |
2270 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2271 | if (ret < 0) |
2272 | goto err5; | |
1da177e4 | 2273 | |
a887c1c1 | 2274 | printk(KERN_INFO "ip6_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2275 | return 0; |
0eff66e6 PM |
2276 | |
2277 | err5: | |
2278 | xt_unregister_match(&icmp6_matchstruct); | |
2279 | err4: | |
2280 | xt_unregister_target(&ip6t_error_target); | |
2281 | err3: | |
2282 | xt_unregister_target(&ip6t_standard_target); | |
2283 | err2: | |
3cb609d5 | 2284 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2285 | err1: |
2286 | return ret; | |
1da177e4 LT |
2287 | } |
2288 | ||
65b4b4e8 | 2289 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2290 | { |
2291 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2292 | |
a45049c5 PNA |
2293 | xt_unregister_match(&icmp6_matchstruct); |
2294 | xt_unregister_target(&ip6t_error_target); | |
2295 | xt_unregister_target(&ip6t_standard_target); | |
3cb609d5 AD |
2296 | |
2297 | unregister_pernet_subsys(&ip6_tables_net_ops); | |
1da177e4 LT |
2298 | } |
2299 | ||
e674d0f3 | 2300 | /* |
b777e0ce PM |
2301 | * find the offset to specified header or the protocol number of last header |
2302 | * if target < 0. "last header" is transport protocol header, ESP, or | |
2303 | * "No next header". | |
2304 | * | |
2305 | * If target header is found, its offset is set in *offset and return protocol | |
2306 | * number. Otherwise, return -1. | |
2307 | * | |
6d381634 PM |
2308 | * If the first fragment doesn't contain the final protocol header or |
2309 | * NEXTHDR_NONE it is considered invalid. | |
2310 | * | |
b777e0ce PM |
2311 | * Note that non-1st fragment is special case that "the protocol number |
2312 | * of last header" is "next header" field in Fragment header. In this case, | |
2313 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
2314 | * isn't NULL. | |
e674d0f3 | 2315 | * |
e674d0f3 | 2316 | */ |
b777e0ce PM |
2317 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
2318 | int target, unsigned short *fragoff) | |
e674d0f3 | 2319 | { |
6b88dd96 | 2320 | unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); |
0660e03f | 2321 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
e674d0f3 YK |
2322 | unsigned int len = skb->len - start; |
2323 | ||
b777e0ce PM |
2324 | if (fragoff) |
2325 | *fragoff = 0; | |
2326 | ||
e674d0f3 YK |
2327 | while (nexthdr != target) { |
2328 | struct ipv6_opt_hdr _hdr, *hp; | |
2329 | unsigned int hdrlen; | |
2330 | ||
b777e0ce PM |
2331 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
2332 | if (target < 0) | |
2333 | break; | |
6d381634 | 2334 | return -ENOENT; |
b777e0ce PM |
2335 | } |
2336 | ||
e674d0f3 YK |
2337 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
2338 | if (hp == NULL) | |
6d381634 | 2339 | return -EBADMSG; |
e674d0f3 | 2340 | if (nexthdr == NEXTHDR_FRAGMENT) { |
e69a4adc AV |
2341 | unsigned short _frag_off; |
2342 | __be16 *fp; | |
e674d0f3 YK |
2343 | fp = skb_header_pointer(skb, |
2344 | start+offsetof(struct frag_hdr, | |
2345 | frag_off), | |
2346 | sizeof(_frag_off), | |
2347 | &_frag_off); | |
2348 | if (fp == NULL) | |
6d381634 | 2349 | return -EBADMSG; |
e674d0f3 | 2350 | |
b777e0ce PM |
2351 | _frag_off = ntohs(*fp) & ~0x7; |
2352 | if (_frag_off) { | |
2353 | if (target < 0 && | |
2354 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
337dde79 | 2355 | hp->nexthdr == NEXTHDR_NONE)) { |
b777e0ce PM |
2356 | if (fragoff) |
2357 | *fragoff = _frag_off; | |
2358 | return hp->nexthdr; | |
2359 | } | |
6d381634 | 2360 | return -ENOENT; |
b777e0ce | 2361 | } |
e674d0f3 YK |
2362 | hdrlen = 8; |
2363 | } else if (nexthdr == NEXTHDR_AUTH) | |
1ab1457c | 2364 | hdrlen = (hp->hdrlen + 2) << 2; |
e674d0f3 | 2365 | else |
1ab1457c | 2366 | hdrlen = ipv6_optlen(hp); |
e674d0f3 YK |
2367 | |
2368 | nexthdr = hp->nexthdr; | |
2369 | len -= hdrlen; | |
2370 | start += hdrlen; | |
2371 | } | |
2372 | ||
2373 | *offset = start; | |
b777e0ce | 2374 | return nexthdr; |
e674d0f3 YK |
2375 | } |
2376 | ||
1da177e4 LT |
2377 | EXPORT_SYMBOL(ip6t_register_table); |
2378 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2379 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2380 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 2381 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 2382 | |
65b4b4e8 AM |
2383 | module_init(ip6_tables_init); |
2384 | module_exit(ip6_tables_fini); |