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 | |
3db05fea | 203 | ip6t_error(struct sk_buff *skb, |
1da177e4 LT |
204 | const struct net_device *in, |
205 | const struct net_device *out, | |
206 | unsigned int hooknum, | |
c4986734 | 207 | const struct xt_target *target, |
fe1cb108 | 208 | const void *targinfo) |
1da177e4 LT |
209 | { |
210 | if (net_ratelimit()) | |
211 | printk("ip6_tables: error: `%s'\n", (char *)targinfo); | |
212 | ||
213 | return NF_DROP; | |
214 | } | |
215 | ||
022748a9 DV |
216 | /* Performance critical - called for every packet */ |
217 | static inline bool | |
f7108a20 JE |
218 | do_match(struct ip6t_entry_match *m, const struct sk_buff *skb, |
219 | struct xt_match_param *par) | |
1da177e4 | 220 | { |
f7108a20 JE |
221 | par->match = m->u.kernel.match; |
222 | par->matchinfo = m->data; | |
223 | ||
1da177e4 | 224 | /* Stop iteration if it doesn't match */ |
f7108a20 | 225 | if (!m->u.kernel.match->match(skb, par)) |
1d93a9cb | 226 | return true; |
1da177e4 | 227 | else |
1d93a9cb | 228 | return false; |
1da177e4 LT |
229 | } |
230 | ||
231 | static inline struct ip6t_entry * | |
232 | get_entry(void *base, unsigned int offset) | |
233 | { | |
234 | return (struct ip6t_entry *)(base + offset); | |
235 | } | |
236 | ||
ba9dda3a | 237 | /* All zeroes == unconditional rule. */ |
022748a9 | 238 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
239 | static inline int |
240 | unconditional(const struct ip6t_ip6 *ipv6) | |
241 | { | |
242 | unsigned int i; | |
243 | ||
244 | for (i = 0; i < sizeof(*ipv6); i++) | |
245 | if (((char *)ipv6)[i]) | |
246 | break; | |
247 | ||
248 | return (i == sizeof(*ipv6)); | |
249 | } | |
250 | ||
251 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
252 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
253 | /* This cries for unification! */ | |
022748a9 | 254 | static const char *const hooknames[] = { |
6e23ae2a PM |
255 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
256 | [NF_INET_LOCAL_IN] = "INPUT", | |
257 | [NF_INET_FORWARD] = "FORWARD", | |
258 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
259 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
260 | }; |
261 | ||
262 | enum nf_ip_trace_comments { | |
263 | NF_IP6_TRACE_COMMENT_RULE, | |
264 | NF_IP6_TRACE_COMMENT_RETURN, | |
265 | NF_IP6_TRACE_COMMENT_POLICY, | |
266 | }; | |
267 | ||
022748a9 | 268 | static const char *const comments[] = { |
ba9dda3a JK |
269 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
270 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
271 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
272 | }; | |
273 | ||
274 | static struct nf_loginfo trace_loginfo = { | |
275 | .type = NF_LOG_TYPE_LOG, | |
276 | .u = { | |
277 | .log = { | |
278 | .level = 4, | |
279 | .logflags = NF_LOG_MASK, | |
280 | }, | |
281 | }, | |
282 | }; | |
283 | ||
022748a9 | 284 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
285 | static inline int |
286 | get_chainname_rulenum(struct ip6t_entry *s, struct ip6t_entry *e, | |
287 | char *hookname, char **chainname, | |
288 | char **comment, unsigned int *rulenum) | |
289 | { | |
290 | struct ip6t_standard_target *t = (void *)ip6t_get_target(s); | |
291 | ||
292 | if (strcmp(t->target.u.kernel.target->name, IP6T_ERROR_TARGET) == 0) { | |
293 | /* Head of user chain: ERROR target with chainname */ | |
294 | *chainname = t->target.data; | |
295 | (*rulenum) = 0; | |
296 | } else if (s == e) { | |
297 | (*rulenum)++; | |
298 | ||
299 | if (s->target_offset == sizeof(struct ip6t_entry) | |
300 | && strcmp(t->target.u.kernel.target->name, | |
301 | IP6T_STANDARD_TARGET) == 0 | |
302 | && t->verdict < 0 | |
303 | && unconditional(&s->ipv6)) { | |
304 | /* Tail of chains: STANDARD target (return/policy) */ | |
305 | *comment = *chainname == hookname | |
306 | ? (char *)comments[NF_IP6_TRACE_COMMENT_POLICY] | |
307 | : (char *)comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
308 | } | |
309 | return 1; | |
310 | } else | |
311 | (*rulenum)++; | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | static void trace_packet(struct sk_buff *skb, | |
317 | unsigned int hook, | |
318 | const struct net_device *in, | |
319 | const struct net_device *out, | |
ecb6f85e | 320 | const char *tablename, |
ba9dda3a JK |
321 | struct xt_table_info *private, |
322 | struct ip6t_entry *e) | |
323 | { | |
324 | void *table_base; | |
5452e425 | 325 | const struct ip6t_entry *root; |
ba9dda3a JK |
326 | char *hookname, *chainname, *comment; |
327 | unsigned int rulenum = 0; | |
328 | ||
329 | table_base = (void *)private->entries[smp_processor_id()]; | |
330 | root = get_entry(table_base, private->hook_entry[hook]); | |
331 | ||
332 | hookname = chainname = (char *)hooknames[hook]; | |
333 | comment = (char *)comments[NF_IP6_TRACE_COMMENT_RULE]; | |
334 | ||
335 | IP6T_ENTRY_ITERATE(root, | |
336 | private->size - private->hook_entry[hook], | |
337 | get_chainname_rulenum, | |
338 | e, hookname, &chainname, &comment, &rulenum); | |
339 | ||
340 | nf_log_packet(AF_INET6, hook, skb, in, out, &trace_loginfo, | |
341 | "TRACE: %s:%s:%s:%u ", | |
342 | tablename, chainname, comment, rulenum); | |
343 | } | |
344 | #endif | |
345 | ||
1da177e4 LT |
346 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
347 | unsigned int | |
3db05fea | 348 | ip6t_do_table(struct sk_buff *skb, |
1da177e4 LT |
349 | unsigned int hook, |
350 | const struct net_device *in, | |
351 | const struct net_device *out, | |
fe1cb108 | 352 | struct xt_table *table) |
1da177e4 | 353 | { |
6b7d31fc | 354 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
cff533ac | 355 | bool hotdrop = false; |
1da177e4 LT |
356 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
357 | unsigned int verdict = NF_DROP; | |
358 | const char *indev, *outdev; | |
359 | void *table_base; | |
360 | struct ip6t_entry *e, *back; | |
2e4e6a17 | 361 | struct xt_table_info *private; |
f7108a20 | 362 | struct xt_match_param mtpar; |
1da177e4 LT |
363 | |
364 | /* Initialization */ | |
365 | indev = in ? in->name : nulldevname; | |
366 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
367 | /* We handle fragments by dealing with the first fragment as |
368 | * if it was a normal packet. All other fragments are treated | |
369 | * normally, except that they will NEVER match rules that ask | |
370 | * things we don't know, ie. tcp syn flag or ports). If the | |
371 | * rule is also a fragment-specific rule, non-fragments won't | |
372 | * match it. */ | |
f7108a20 JE |
373 | mtpar.hotdrop = &hotdrop; |
374 | mtpar.in = in; | |
375 | mtpar.out = out; | |
1da177e4 LT |
376 | |
377 | read_lock_bh(&table->lock); | |
378 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); | |
9c547959 | 379 | private = table->private; |
2e4e6a17 HW |
380 | table_base = (void *)private->entries[smp_processor_id()]; |
381 | e = get_entry(table_base, private->hook_entry[hook]); | |
1da177e4 | 382 | |
1da177e4 | 383 | /* For return from builtin chain */ |
2e4e6a17 | 384 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
385 | |
386 | do { | |
387 | IP_NF_ASSERT(e); | |
388 | IP_NF_ASSERT(back); | |
3db05fea | 389 | if (ip6_packet_match(skb, indev, outdev, &e->ipv6, |
f7108a20 | 390 | &mtpar.thoff, &mtpar.fragoff, &hotdrop)) { |
1da177e4 LT |
391 | struct ip6t_entry_target *t; |
392 | ||
f7108a20 | 393 | if (IP6T_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) |
1da177e4 LT |
394 | goto no_match; |
395 | ||
396 | ADD_COUNTER(e->counters, | |
72f36ec1 PM |
397 | ntohs(ipv6_hdr(skb)->payload_len) + |
398 | sizeof(struct ipv6hdr), 1); | |
1da177e4 LT |
399 | |
400 | t = ip6t_get_target(e); | |
401 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
402 | |
403 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
404 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
405 | /* The packet is traced: log it */ | |
3db05fea HX |
406 | if (unlikely(skb->nf_trace)) |
407 | trace_packet(skb, hook, in, out, | |
ba9dda3a JK |
408 | table->name, private, e); |
409 | #endif | |
1da177e4 LT |
410 | /* Standard target? */ |
411 | if (!t->u.kernel.target->target) { | |
412 | int v; | |
413 | ||
414 | v = ((struct ip6t_standard_target *)t)->verdict; | |
415 | if (v < 0) { | |
416 | /* Pop from stack? */ | |
417 | if (v != IP6T_RETURN) { | |
418 | verdict = (unsigned)(-v) - 1; | |
419 | break; | |
420 | } | |
421 | e = back; | |
422 | back = get_entry(table_base, | |
423 | back->comefrom); | |
424 | continue; | |
425 | } | |
05465343 PM |
426 | if (table_base + v != (void *)e + e->next_offset |
427 | && !(e->ipv6.flags & IP6T_F_GOTO)) { | |
1da177e4 LT |
428 | /* Save old back ptr in next entry */ |
429 | struct ip6t_entry *next | |
430 | = (void *)e + e->next_offset; | |
431 | next->comefrom | |
432 | = (void *)back - table_base; | |
433 | /* set back pointer to next entry */ | |
434 | back = next; | |
435 | } | |
436 | ||
437 | e = get_entry(table_base, v); | |
438 | } else { | |
439 | /* Targets which reenter must return | |
1ab1457c | 440 | abs. verdicts */ |
1da177e4 LT |
441 | #ifdef CONFIG_NETFILTER_DEBUG |
442 | ((struct ip6t_entry *)table_base)->comefrom | |
443 | = 0xeeeeeeec; | |
444 | #endif | |
3db05fea | 445 | verdict = t->u.kernel.target->target(skb, |
1da177e4 LT |
446 | in, out, |
447 | hook, | |
1c524830 | 448 | t->u.kernel.target, |
fe1cb108 | 449 | t->data); |
1da177e4 LT |
450 | |
451 | #ifdef CONFIG_NETFILTER_DEBUG | |
452 | if (((struct ip6t_entry *)table_base)->comefrom | |
453 | != 0xeeeeeeec | |
454 | && verdict == IP6T_CONTINUE) { | |
455 | printk("Target %s reentered!\n", | |
456 | t->u.kernel.target->name); | |
457 | verdict = NF_DROP; | |
458 | } | |
459 | ((struct ip6t_entry *)table_base)->comefrom | |
460 | = 0x57acc001; | |
461 | #endif | |
462 | if (verdict == IP6T_CONTINUE) | |
463 | e = (void *)e + e->next_offset; | |
464 | else | |
465 | /* Verdict */ | |
466 | break; | |
467 | } | |
468 | } else { | |
469 | ||
470 | no_match: | |
471 | e = (void *)e + e->next_offset; | |
472 | } | |
473 | } while (!hotdrop); | |
474 | ||
475 | #ifdef CONFIG_NETFILTER_DEBUG | |
4bdbf6c0 | 476 | ((struct ip6t_entry *)table_base)->comefrom = NETFILTER_LINK_POISON; |
1da177e4 LT |
477 | #endif |
478 | read_unlock_bh(&table->lock); | |
479 | ||
480 | #ifdef DEBUG_ALLOW_ALL | |
481 | return NF_ACCEPT; | |
482 | #else | |
483 | if (hotdrop) | |
484 | return NF_DROP; | |
485 | else return verdict; | |
486 | #endif | |
487 | } | |
488 | ||
1da177e4 LT |
489 | /* Figures out from what hook each rule can be called: returns 0 if |
490 | there are loops. Puts hook bitmask in comefrom. */ | |
491 | static int | |
2e4e6a17 | 492 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 493 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
494 | { |
495 | unsigned int hook; | |
496 | ||
497 | /* No recursion; use packet counter to save back ptrs (reset | |
498 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 499 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 500 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 501 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
502 | |
503 | if (!(valid_hooks & (1 << hook))) | |
504 | continue; | |
505 | ||
506 | /* Set initial back pointer. */ | |
507 | e->counters.pcnt = pos; | |
508 | ||
509 | for (;;) { | |
510 | struct ip6t_standard_target *t | |
511 | = (void *)ip6t_get_target(e); | |
9c547959 | 512 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 513 | |
6e23ae2a | 514 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
515 | printk("iptables: loop hook %u pos %u %08X.\n", |
516 | hook, pos, e->comefrom); | |
517 | return 0; | |
518 | } | |
9c547959 | 519 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
520 | |
521 | /* Unconditional return/END. */ | |
e1b4b9f3 | 522 | if ((e->target_offset == sizeof(struct ip6t_entry) |
1da177e4 LT |
523 | && (strcmp(t->target.u.user.name, |
524 | IP6T_STANDARD_TARGET) == 0) | |
525 | && t->verdict < 0 | |
e1b4b9f3 | 526 | && unconditional(&e->ipv6)) || visited) { |
1da177e4 LT |
527 | unsigned int oldpos, size; |
528 | ||
74c9c0c1 DM |
529 | if (t->verdict < -NF_MAX_VERDICT - 1) { |
530 | duprintf("mark_source_chains: bad " | |
531 | "negative verdict (%i)\n", | |
532 | t->verdict); | |
533 | return 0; | |
534 | } | |
535 | ||
1da177e4 LT |
536 | /* Return: backtrack through the last |
537 | big jump. */ | |
538 | do { | |
6e23ae2a | 539 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
540 | #ifdef DEBUG_IP_FIREWALL_USER |
541 | if (e->comefrom | |
6e23ae2a | 542 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
543 | duprintf("Back unset " |
544 | "on hook %u " | |
545 | "rule %u\n", | |
546 | hook, pos); | |
547 | } | |
548 | #endif | |
549 | oldpos = pos; | |
550 | pos = e->counters.pcnt; | |
551 | e->counters.pcnt = 0; | |
552 | ||
553 | /* We're at the start. */ | |
554 | if (pos == oldpos) | |
555 | goto next; | |
556 | ||
557 | e = (struct ip6t_entry *) | |
31836064 | 558 | (entry0 + pos); |
1da177e4 LT |
559 | } while (oldpos == pos + e->next_offset); |
560 | ||
561 | /* Move along one */ | |
562 | size = e->next_offset; | |
563 | e = (struct ip6t_entry *) | |
31836064 | 564 | (entry0 + pos + size); |
1da177e4 LT |
565 | e->counters.pcnt = pos; |
566 | pos += size; | |
567 | } else { | |
568 | int newpos = t->verdict; | |
569 | ||
570 | if (strcmp(t->target.u.user.name, | |
571 | IP6T_STANDARD_TARGET) == 0 | |
572 | && newpos >= 0) { | |
74c9c0c1 DM |
573 | if (newpos > newinfo->size - |
574 | sizeof(struct ip6t_entry)) { | |
575 | duprintf("mark_source_chains: " | |
576 | "bad verdict (%i)\n", | |
577 | newpos); | |
578 | return 0; | |
579 | } | |
1da177e4 LT |
580 | /* This a jump; chase it. */ |
581 | duprintf("Jump rule %u -> %u\n", | |
582 | pos, newpos); | |
583 | } else { | |
584 | /* ... this is a fallthru */ | |
585 | newpos = pos + e->next_offset; | |
586 | } | |
587 | e = (struct ip6t_entry *) | |
31836064 | 588 | (entry0 + newpos); |
1da177e4 LT |
589 | e->counters.pcnt = pos; |
590 | pos = newpos; | |
591 | } | |
592 | } | |
593 | next: | |
594 | duprintf("Finished chain %u\n", hook); | |
595 | } | |
596 | return 1; | |
597 | } | |
598 | ||
022748a9 | 599 | static int |
1da177e4 LT |
600 | cleanup_match(struct ip6t_entry_match *m, unsigned int *i) |
601 | { | |
602 | if (i && (*i)-- == 0) | |
603 | return 1; | |
604 | ||
605 | if (m->u.kernel.match->destroy) | |
efa74165 | 606 | m->u.kernel.match->destroy(m->u.kernel.match, m->data); |
1da177e4 LT |
607 | module_put(m->u.kernel.match->me); |
608 | return 0; | |
609 | } | |
610 | ||
022748a9 | 611 | static int |
f173c8a1 PM |
612 | check_entry(struct ip6t_entry *e, const char *name) |
613 | { | |
614 | struct ip6t_entry_target *t; | |
615 | ||
616 | if (!ip6_checkentry(&e->ipv6)) { | |
617 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
618 | return -EINVAL; | |
619 | } | |
620 | ||
621 | if (e->target_offset + sizeof(struct ip6t_entry_target) > | |
622 | e->next_offset) | |
623 | return -EINVAL; | |
624 | ||
625 | t = ip6t_get_target(e); | |
626 | if (e->target_offset + t->u.target_size > e->next_offset) | |
627 | return -EINVAL; | |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
022748a9 | 632 | static int check_match(struct ip6t_entry_match *m, const char *name, |
f173c8a1 PM |
633 | const struct ip6t_ip6 *ipv6, |
634 | unsigned int hookmask, unsigned int *i) | |
635 | { | |
636 | struct xt_match *match; | |
637 | int ret; | |
638 | ||
639 | match = m->u.kernel.match; | |
640 | ret = xt_check_match(match, AF_INET6, m->u.match_size - sizeof(*m), | |
641 | name, hookmask, ipv6->proto, | |
367c6790 JE |
642 | ipv6->invflags & IP6T_INV_PROTO, ipv6, m->data); |
643 | if (ret < 0) { | |
f173c8a1 PM |
644 | duprintf("ip_tables: check failed for `%s'.\n", |
645 | m->u.kernel.match->name); | |
367c6790 | 646 | return ret; |
f173c8a1 | 647 | } |
367c6790 JE |
648 | ++*i; |
649 | return 0; | |
f173c8a1 PM |
650 | } |
651 | ||
022748a9 | 652 | static int |
f173c8a1 PM |
653 | find_check_match(struct ip6t_entry_match *m, |
654 | const char *name, | |
655 | const struct ip6t_ip6 *ipv6, | |
656 | unsigned int hookmask, | |
657 | unsigned int *i) | |
1da177e4 | 658 | { |
6709dbbb | 659 | struct xt_match *match; |
3cdc7c95 | 660 | int ret; |
1da177e4 | 661 | |
2e4e6a17 | 662 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, |
9c547959 | 663 | m->u.user.revision), |
6b7d31fc HW |
664 | "ip6t_%s", m->u.user.name); |
665 | if (IS_ERR(match) || !match) { | |
f173c8a1 | 666 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
6b7d31fc | 667 | return match ? PTR_ERR(match) : -ENOENT; |
1da177e4 LT |
668 | } |
669 | m->u.kernel.match = match; | |
1da177e4 | 670 | |
f173c8a1 | 671 | ret = check_match(m, name, ipv6, hookmask, i); |
3cdc7c95 PM |
672 | if (ret) |
673 | goto err; | |
674 | ||
1da177e4 | 675 | return 0; |
3cdc7c95 PM |
676 | err: |
677 | module_put(m->u.kernel.match->me); | |
678 | return ret; | |
1da177e4 LT |
679 | } |
680 | ||
022748a9 | 681 | static int check_target(struct ip6t_entry *e, const char *name) |
1da177e4 LT |
682 | { |
683 | struct ip6t_entry_target *t; | |
6709dbbb | 684 | struct xt_target *target; |
1da177e4 | 685 | int ret; |
1da177e4 | 686 | |
f173c8a1 PM |
687 | t = ip6t_get_target(e); |
688 | target = t->u.kernel.target; | |
689 | ret = xt_check_target(target, AF_INET6, t->u.target_size - sizeof(*t), | |
690 | name, e->comefrom, e->ipv6.proto, | |
367c6790 JE |
691 | e->ipv6.invflags & IP6T_INV_PROTO, e, t->data); |
692 | if (ret < 0) { | |
f173c8a1 PM |
693 | duprintf("ip_tables: check failed for `%s'.\n", |
694 | t->u.kernel.target->name); | |
367c6790 | 695 | return ret; |
1da177e4 | 696 | } |
367c6790 | 697 | return 0; |
f173c8a1 | 698 | } |
1da177e4 | 699 | |
022748a9 | 700 | static int |
f173c8a1 PM |
701 | find_check_entry(struct ip6t_entry *e, const char *name, unsigned int size, |
702 | unsigned int *i) | |
703 | { | |
704 | struct ip6t_entry_target *t; | |
705 | struct xt_target *target; | |
706 | int ret; | |
707 | unsigned int j; | |
708 | ||
709 | ret = check_entry(e, name); | |
710 | if (ret) | |
711 | return ret; | |
590bdf7f | 712 | |
1da177e4 | 713 | j = 0; |
f173c8a1 PM |
714 | ret = IP6T_MATCH_ITERATE(e, find_check_match, name, &e->ipv6, |
715 | e->comefrom, &j); | |
1da177e4 LT |
716 | if (ret != 0) |
717 | goto cleanup_matches; | |
718 | ||
719 | t = ip6t_get_target(e); | |
2e4e6a17 HW |
720 | target = try_then_request_module(xt_find_target(AF_INET6, |
721 | t->u.user.name, | |
722 | t->u.user.revision), | |
6b7d31fc HW |
723 | "ip6t_%s", t->u.user.name); |
724 | if (IS_ERR(target) || !target) { | |
f173c8a1 | 725 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
6b7d31fc | 726 | ret = target ? PTR_ERR(target) : -ENOENT; |
1da177e4 LT |
727 | goto cleanup_matches; |
728 | } | |
729 | t->u.kernel.target = target; | |
6b7d31fc | 730 | |
f173c8a1 | 731 | ret = check_target(e, name); |
3cdc7c95 PM |
732 | if (ret) |
733 | goto err; | |
734 | ||
1da177e4 LT |
735 | (*i)++; |
736 | return 0; | |
3cdc7c95 PM |
737 | err: |
738 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
739 | cleanup_matches: |
740 | IP6T_MATCH_ITERATE(e, cleanup_match, &j); | |
741 | return ret; | |
742 | } | |
743 | ||
022748a9 | 744 | static int |
1da177e4 | 745 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 746 | struct xt_table_info *newinfo, |
1da177e4 LT |
747 | unsigned char *base, |
748 | unsigned char *limit, | |
749 | const unsigned int *hook_entries, | |
750 | const unsigned int *underflows, | |
751 | unsigned int *i) | |
752 | { | |
753 | unsigned int h; | |
754 | ||
755 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 | |
756 | || (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
757 | duprintf("Bad offset %p\n", e); | |
758 | return -EINVAL; | |
759 | } | |
760 | ||
761 | if (e->next_offset | |
762 | < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) { | |
763 | duprintf("checking: element %p size %u\n", | |
764 | e, e->next_offset); | |
765 | return -EINVAL; | |
766 | } | |
767 | ||
768 | /* Check hooks & underflows */ | |
6e23ae2a | 769 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
1da177e4 LT |
770 | if ((unsigned char *)e - base == hook_entries[h]) |
771 | newinfo->hook_entry[h] = hook_entries[h]; | |
772 | if ((unsigned char *)e - base == underflows[h]) | |
773 | newinfo->underflow[h] = underflows[h]; | |
774 | } | |
775 | ||
776 | /* FIXME: underflows must be unconditional, standard verdicts | |
1ab1457c | 777 | < 0 (not IP6T_RETURN). --RR */ |
1da177e4 LT |
778 | |
779 | /* Clear counters and comefrom */ | |
2e4e6a17 | 780 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
781 | e->comefrom = 0; |
782 | ||
783 | (*i)++; | |
784 | return 0; | |
785 | } | |
786 | ||
022748a9 | 787 | static int |
1da177e4 LT |
788 | cleanup_entry(struct ip6t_entry *e, unsigned int *i) |
789 | { | |
790 | struct ip6t_entry_target *t; | |
791 | ||
792 | if (i && (*i)-- == 0) | |
793 | return 1; | |
794 | ||
795 | /* Cleanup all matches */ | |
796 | IP6T_MATCH_ITERATE(e, cleanup_match, NULL); | |
797 | t = ip6t_get_target(e); | |
798 | if (t->u.kernel.target->destroy) | |
efa74165 | 799 | t->u.kernel.target->destroy(t->u.kernel.target, t->data); |
1da177e4 LT |
800 | module_put(t->u.kernel.target->me); |
801 | return 0; | |
802 | } | |
803 | ||
804 | /* Checks and translates the user-supplied table segment (held in | |
805 | newinfo) */ | |
806 | static int | |
807 | translate_table(const char *name, | |
808 | unsigned int valid_hooks, | |
2e4e6a17 | 809 | struct xt_table_info *newinfo, |
31836064 | 810 | void *entry0, |
1da177e4 LT |
811 | unsigned int size, |
812 | unsigned int number, | |
813 | const unsigned int *hook_entries, | |
814 | const unsigned int *underflows) | |
815 | { | |
816 | unsigned int i; | |
817 | int ret; | |
818 | ||
819 | newinfo->size = size; | |
820 | newinfo->number = number; | |
821 | ||
822 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 823 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
824 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
825 | newinfo->underflow[i] = 0xFFFFFFFF; | |
826 | } | |
827 | ||
828 | duprintf("translate_table: size %u\n", newinfo->size); | |
829 | i = 0; | |
830 | /* Walk through entries, checking offsets. */ | |
31836064 | 831 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
832 | check_entry_size_and_hooks, |
833 | newinfo, | |
31836064 ED |
834 | entry0, |
835 | entry0 + size, | |
1da177e4 LT |
836 | hook_entries, underflows, &i); |
837 | if (ret != 0) | |
838 | return ret; | |
839 | ||
840 | if (i != number) { | |
841 | duprintf("translate_table: %u not %u entries\n", | |
842 | i, number); | |
843 | return -EINVAL; | |
844 | } | |
845 | ||
846 | /* Check hooks all assigned */ | |
6e23ae2a | 847 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
848 | /* Only hooks which are valid */ |
849 | if (!(valid_hooks & (1 << i))) | |
850 | continue; | |
851 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
852 | duprintf("Invalid hook entry %u %u\n", | |
853 | i, hook_entries[i]); | |
854 | return -EINVAL; | |
855 | } | |
856 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
857 | duprintf("Invalid underflow %u %u\n", | |
858 | i, underflows[i]); | |
859 | return -EINVAL; | |
860 | } | |
861 | } | |
862 | ||
74c9c0c1 DM |
863 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
864 | return -ELOOP; | |
865 | ||
1da177e4 LT |
866 | /* Finally, each sanity check must pass */ |
867 | i = 0; | |
31836064 | 868 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
f173c8a1 | 869 | find_check_entry, name, size, &i); |
1da177e4 | 870 | |
74c9c0c1 DM |
871 | if (ret != 0) { |
872 | IP6T_ENTRY_ITERATE(entry0, newinfo->size, | |
873 | cleanup_entry, &i); | |
874 | return ret; | |
875 | } | |
1da177e4 LT |
876 | |
877 | /* And one copy for every other CPU */ | |
6f912042 | 878 | for_each_possible_cpu(i) { |
31836064 ED |
879 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
880 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
881 | } |
882 | ||
9c547959 | 883 | return ret; |
1da177e4 LT |
884 | } |
885 | ||
1da177e4 LT |
886 | /* Gets counters. */ |
887 | static inline int | |
888 | add_entry_to_counter(const struct ip6t_entry *e, | |
2e4e6a17 | 889 | struct xt_counters total[], |
1da177e4 LT |
890 | unsigned int *i) |
891 | { | |
892 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
893 | ||
894 | (*i)++; | |
895 | return 0; | |
896 | } | |
897 | ||
31836064 ED |
898 | static inline int |
899 | set_entry_to_counter(const struct ip6t_entry *e, | |
900 | struct ip6t_counters total[], | |
901 | unsigned int *i) | |
902 | { | |
903 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
904 | ||
905 | (*i)++; | |
906 | return 0; | |
907 | } | |
908 | ||
1da177e4 | 909 | static void |
2e4e6a17 HW |
910 | get_counters(const struct xt_table_info *t, |
911 | struct xt_counters counters[]) | |
1da177e4 LT |
912 | { |
913 | unsigned int cpu; | |
914 | unsigned int i; | |
31836064 ED |
915 | unsigned int curcpu; |
916 | ||
917 | /* Instead of clearing (by a previous call to memset()) | |
918 | * the counters and using adds, we set the counters | |
919 | * with data used by 'current' CPU | |
920 | * We dont care about preemption here. | |
921 | */ | |
922 | curcpu = raw_smp_processor_id(); | |
923 | ||
924 | i = 0; | |
925 | IP6T_ENTRY_ITERATE(t->entries[curcpu], | |
926 | t->size, | |
927 | set_entry_to_counter, | |
928 | counters, | |
929 | &i); | |
1da177e4 | 930 | |
6f912042 | 931 | for_each_possible_cpu(cpu) { |
31836064 ED |
932 | if (cpu == curcpu) |
933 | continue; | |
1da177e4 | 934 | i = 0; |
31836064 | 935 | IP6T_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
936 | t->size, |
937 | add_entry_to_counter, | |
938 | counters, | |
939 | &i); | |
940 | } | |
941 | } | |
942 | ||
022748a9 | 943 | static struct xt_counters *alloc_counters(struct xt_table *table) |
1da177e4 | 944 | { |
ed1a6f5e | 945 | unsigned int countersize; |
2e4e6a17 | 946 | struct xt_counters *counters; |
5452e425 | 947 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
948 | |
949 | /* We need atomic snapshot of counters: rest doesn't change | |
950 | (other than comefrom, which userspace doesn't care | |
951 | about). */ | |
2e4e6a17 | 952 | countersize = sizeof(struct xt_counters) * private->number; |
3b84e92b | 953 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
954 | |
955 | if (counters == NULL) | |
ed1a6f5e | 956 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
957 | |
958 | /* First, sum counters... */ | |
1da177e4 | 959 | write_lock_bh(&table->lock); |
2e4e6a17 | 960 | get_counters(private, counters); |
1da177e4 LT |
961 | write_unlock_bh(&table->lock); |
962 | ||
ed1a6f5e PM |
963 | return counters; |
964 | } | |
965 | ||
966 | static int | |
967 | copy_entries_to_user(unsigned int total_size, | |
968 | struct xt_table *table, | |
969 | void __user *userptr) | |
970 | { | |
971 | unsigned int off, num; | |
972 | struct ip6t_entry *e; | |
973 | struct xt_counters *counters; | |
5452e425 | 974 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 975 | int ret = 0; |
5452e425 | 976 | const void *loc_cpu_entry; |
ed1a6f5e PM |
977 | |
978 | counters = alloc_counters(table); | |
979 | if (IS_ERR(counters)) | |
980 | return PTR_ERR(counters); | |
981 | ||
9c547959 PM |
982 | /* choose the copy that is on our node/cpu, ... |
983 | * This choice is lazy (because current thread is | |
984 | * allowed to migrate to another cpu) | |
985 | */ | |
2e4e6a17 | 986 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 987 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
988 | ret = -EFAULT; |
989 | goto free_counters; | |
990 | } | |
991 | ||
992 | /* FIXME: use iterator macros --RR */ | |
993 | /* ... then go back and fix counters and names */ | |
994 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
995 | unsigned int i; | |
5452e425 JE |
996 | const struct ip6t_entry_match *m; |
997 | const struct ip6t_entry_target *t; | |
1da177e4 | 998 | |
31836064 | 999 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
1000 | if (copy_to_user(userptr + off |
1001 | + offsetof(struct ip6t_entry, counters), | |
1002 | &counters[num], | |
1003 | sizeof(counters[num])) != 0) { | |
1004 | ret = -EFAULT; | |
1005 | goto free_counters; | |
1006 | } | |
1007 | ||
1008 | for (i = sizeof(struct ip6t_entry); | |
1009 | i < e->target_offset; | |
1010 | i += m->u.match_size) { | |
1011 | m = (void *)e + i; | |
1012 | ||
1013 | if (copy_to_user(userptr + off + i | |
1014 | + offsetof(struct ip6t_entry_match, | |
1015 | u.user.name), | |
1016 | m->u.kernel.match->name, | |
1017 | strlen(m->u.kernel.match->name)+1) | |
1018 | != 0) { | |
1019 | ret = -EFAULT; | |
1020 | goto free_counters; | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | t = ip6t_get_target(e); | |
1025 | if (copy_to_user(userptr + off + e->target_offset | |
1026 | + offsetof(struct ip6t_entry_target, | |
1027 | u.user.name), | |
1028 | t->u.kernel.target->name, | |
1029 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1030 | ret = -EFAULT; | |
1031 | goto free_counters; | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | free_counters: | |
1036 | vfree(counters); | |
1037 | return ret; | |
1038 | } | |
1039 | ||
3bc3fe5e PM |
1040 | #ifdef CONFIG_COMPAT |
1041 | static void compat_standard_from_user(void *dst, void *src) | |
1042 | { | |
1043 | int v = *(compat_int_t *)src; | |
1044 | ||
1045 | if (v > 0) | |
1046 | v += xt_compat_calc_jump(AF_INET6, v); | |
1047 | memcpy(dst, &v, sizeof(v)); | |
1048 | } | |
1049 | ||
1050 | static int compat_standard_to_user(void __user *dst, void *src) | |
1051 | { | |
1052 | compat_int_t cv = *(int *)src; | |
1053 | ||
1054 | if (cv > 0) | |
1055 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1056 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1057 | } | |
1058 | ||
1059 | static inline int | |
1060 | compat_calc_match(struct ip6t_entry_match *m, int *size) | |
1061 | { | |
1062 | *size += xt_compat_match_offset(m->u.kernel.match); | |
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | static int compat_calc_entry(struct ip6t_entry *e, | |
1067 | const struct xt_table_info *info, | |
1068 | void *base, struct xt_table_info *newinfo) | |
1069 | { | |
1070 | struct ip6t_entry_target *t; | |
1071 | unsigned int entry_offset; | |
1072 | int off, i, ret; | |
1073 | ||
1074 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1075 | entry_offset = (void *)e - base; | |
1076 | IP6T_MATCH_ITERATE(e, compat_calc_match, &off); | |
1077 | t = ip6t_get_target(e); | |
1078 | off += xt_compat_target_offset(t->u.kernel.target); | |
1079 | newinfo->size -= off; | |
1080 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1081 | if (ret) | |
1082 | return ret; | |
1083 | ||
1084 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1085 | if (info->hook_entry[i] && | |
1086 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1087 | newinfo->hook_entry[i] -= off; | |
1088 | if (info->underflow[i] && | |
1089 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1090 | newinfo->underflow[i] -= off; | |
1091 | } | |
1092 | return 0; | |
1093 | } | |
1094 | ||
1095 | static int compat_table_info(const struct xt_table_info *info, | |
1096 | struct xt_table_info *newinfo) | |
1097 | { | |
1098 | void *loc_cpu_entry; | |
1099 | ||
1100 | if (!newinfo || !info) | |
1101 | return -EINVAL; | |
1102 | ||
1103 | /* we dont care about newinfo->entries[] */ | |
1104 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1105 | newinfo->initial_entries = 0; | |
1106 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
1107 | return IP6T_ENTRY_ITERATE(loc_cpu_entry, info->size, | |
1108 | compat_calc_entry, info, loc_cpu_entry, | |
1109 | newinfo); | |
1110 | } | |
1111 | #endif | |
1112 | ||
336b517f | 1113 | static int get_info(struct net *net, void __user *user, int *len, int compat) |
433665c9 PM |
1114 | { |
1115 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1116 | struct xt_table *t; | |
1117 | int ret; | |
1118 | ||
1119 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1120 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1121 | sizeof(struct ip6t_getinfo)); |
1122 | return -EINVAL; | |
1123 | } | |
1124 | ||
1125 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1126 | return -EFAULT; | |
1127 | ||
1128 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; | |
3bc3fe5e PM |
1129 | #ifdef CONFIG_COMPAT |
1130 | if (compat) | |
1131 | xt_compat_lock(AF_INET6); | |
1132 | #endif | |
336b517f | 1133 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 PM |
1134 | "ip6table_%s", name); |
1135 | if (t && !IS_ERR(t)) { | |
1136 | struct ip6t_getinfo info; | |
5452e425 | 1137 | const struct xt_table_info *private = t->private; |
433665c9 | 1138 | |
3bc3fe5e PM |
1139 | #ifdef CONFIG_COMPAT |
1140 | if (compat) { | |
1141 | struct xt_table_info tmp; | |
1142 | ret = compat_table_info(private, &tmp); | |
1143 | xt_compat_flush_offsets(AF_INET6); | |
1144 | private = &tmp; | |
1145 | } | |
1146 | #endif | |
433665c9 PM |
1147 | info.valid_hooks = t->valid_hooks; |
1148 | memcpy(info.hook_entry, private->hook_entry, | |
1149 | sizeof(info.hook_entry)); | |
1150 | memcpy(info.underflow, private->underflow, | |
1151 | sizeof(info.underflow)); | |
1152 | info.num_entries = private->number; | |
1153 | info.size = private->size; | |
b5dd674b | 1154 | strcpy(info.name, name); |
433665c9 PM |
1155 | |
1156 | if (copy_to_user(user, &info, *len) != 0) | |
1157 | ret = -EFAULT; | |
1158 | else | |
1159 | ret = 0; | |
1160 | ||
1161 | xt_table_unlock(t); | |
1162 | module_put(t->me); | |
1163 | } else | |
1164 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1165 | #ifdef CONFIG_COMPAT |
1166 | if (compat) | |
1167 | xt_compat_unlock(AF_INET6); | |
1168 | #endif | |
433665c9 PM |
1169 | return ret; |
1170 | } | |
1171 | ||
1da177e4 | 1172 | static int |
336b517f | 1173 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, int *len) |
1da177e4 LT |
1174 | { |
1175 | int ret; | |
d924357c | 1176 | struct ip6t_get_entries get; |
2e4e6a17 | 1177 | struct xt_table *t; |
1da177e4 | 1178 | |
d924357c | 1179 | if (*len < sizeof(get)) { |
c9d8fe13 | 1180 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1181 | return -EINVAL; |
1182 | } | |
1183 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1184 | return -EFAULT; | |
1185 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1186 | duprintf("get_entries: %u != %zu\n", |
1187 | *len, sizeof(get) + get.size); | |
d924357c PM |
1188 | return -EINVAL; |
1189 | } | |
1190 | ||
336b517f | 1191 | t = xt_find_table_lock(net, AF_INET6, get.name); |
6b7d31fc | 1192 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
1193 | struct xt_table_info *private = t->private; |
1194 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1195 | if (get.size == private->size) |
2e4e6a17 | 1196 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1197 | t, uptr->entrytable); |
1198 | else { | |
1199 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1200 | private->size, get.size); |
544473c1 | 1201 | ret = -EAGAIN; |
1da177e4 | 1202 | } |
6b7d31fc | 1203 | module_put(t->me); |
2e4e6a17 | 1204 | xt_table_unlock(t); |
1da177e4 | 1205 | } else |
6b7d31fc | 1206 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1207 | |
1208 | return ret; | |
1209 | } | |
1210 | ||
1211 | static int | |
336b517f | 1212 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1213 | struct xt_table_info *newinfo, unsigned int num_counters, |
1214 | void __user *counters_ptr) | |
1da177e4 LT |
1215 | { |
1216 | int ret; | |
2e4e6a17 | 1217 | struct xt_table *t; |
3bc3fe5e | 1218 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1219 | struct xt_counters *counters; |
5452e425 | 1220 | const void *loc_cpu_old_entry; |
1da177e4 | 1221 | |
3bc3fe5e PM |
1222 | ret = 0; |
1223 | counters = vmalloc_node(num_counters * sizeof(struct xt_counters), | |
3b84e92b | 1224 | numa_node_id()); |
1da177e4 LT |
1225 | if (!counters) { |
1226 | ret = -ENOMEM; | |
3bc3fe5e | 1227 | goto out; |
1da177e4 | 1228 | } |
1da177e4 | 1229 | |
336b517f | 1230 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1231 | "ip6table_%s", name); |
6b7d31fc HW |
1232 | if (!t || IS_ERR(t)) { |
1233 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1234 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1235 | } |
1da177e4 LT |
1236 | |
1237 | /* You lied! */ | |
3bc3fe5e | 1238 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1239 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1240 | valid_hooks, t->valid_hooks); |
1da177e4 | 1241 | ret = -EINVAL; |
6b7d31fc | 1242 | goto put_module; |
1da177e4 LT |
1243 | } |
1244 | ||
3bc3fe5e | 1245 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1246 | if (!oldinfo) |
1247 | goto put_module; | |
1248 | ||
1249 | /* Update module usage count based on number of rules */ | |
1250 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1251 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1252 | if ((oldinfo->number > oldinfo->initial_entries) || |
1253 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1254 | module_put(t->me); |
1255 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1256 | (newinfo->number <= oldinfo->initial_entries)) | |
1257 | module_put(t->me); | |
1258 | ||
1259 | /* Get the old counters. */ | |
1260 | get_counters(oldinfo, counters); | |
1261 | /* Decrease module usage counts and free resource */ | |
31836064 | 1262 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
3bc3fe5e PM |
1263 | IP6T_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry, |
1264 | NULL); | |
2e4e6a17 | 1265 | xt_free_table_info(oldinfo); |
3bc3fe5e PM |
1266 | if (copy_to_user(counters_ptr, counters, |
1267 | sizeof(struct xt_counters) * num_counters) != 0) | |
1da177e4 LT |
1268 | ret = -EFAULT; |
1269 | vfree(counters); | |
2e4e6a17 | 1270 | xt_table_unlock(t); |
1da177e4 LT |
1271 | return ret; |
1272 | ||
1273 | put_module: | |
1274 | module_put(t->me); | |
2e4e6a17 | 1275 | xt_table_unlock(t); |
1da177e4 | 1276 | free_newinfo_counters_untrans: |
1da177e4 | 1277 | vfree(counters); |
3bc3fe5e PM |
1278 | out: |
1279 | return ret; | |
1280 | } | |
1281 | ||
1282 | static int | |
336b517f | 1283 | do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1284 | { |
1285 | int ret; | |
1286 | struct ip6t_replace tmp; | |
1287 | struct xt_table_info *newinfo; | |
1288 | void *loc_cpu_entry; | |
1289 | ||
1290 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1291 | return -EFAULT; | |
1292 | ||
1293 | /* overflow check */ | |
1294 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1295 | return -ENOMEM; | |
1296 | ||
1297 | newinfo = xt_alloc_table_info(tmp.size); | |
1298 | if (!newinfo) | |
1299 | return -ENOMEM; | |
1300 | ||
1301 | /* choose the copy that is on our node/cpu */ | |
1302 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1303 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1304 | tmp.size) != 0) { | |
1305 | ret = -EFAULT; | |
1306 | goto free_newinfo; | |
1307 | } | |
1308 | ||
1309 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
1310 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, | |
1311 | tmp.hook_entry, tmp.underflow); | |
1312 | if (ret != 0) | |
1313 | goto free_newinfo; | |
1314 | ||
1315 | duprintf("ip_tables: Translated table\n"); | |
1316 | ||
336b517f | 1317 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1318 | tmp.num_counters, tmp.counters); |
1319 | if (ret) | |
1320 | goto free_newinfo_untrans; | |
1321 | return 0; | |
1322 | ||
1323 | free_newinfo_untrans: | |
1324 | IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); | |
1da177e4 | 1325 | free_newinfo: |
2e4e6a17 | 1326 | xt_free_table_info(newinfo); |
1da177e4 LT |
1327 | return ret; |
1328 | } | |
1329 | ||
1330 | /* We're lazy, and add to the first CPU; overflow works its fey magic | |
1331 | * and everything is OK. */ | |
1332 | static inline int | |
1333 | add_counter_to_entry(struct ip6t_entry *e, | |
2e4e6a17 | 1334 | const struct xt_counters addme[], |
1da177e4 LT |
1335 | unsigned int *i) |
1336 | { | |
1337 | #if 0 | |
1338 | duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n", | |
1339 | *i, | |
1340 | (long unsigned int)e->counters.pcnt, | |
1341 | (long unsigned int)e->counters.bcnt, | |
1342 | (long unsigned int)addme[*i].pcnt, | |
1343 | (long unsigned int)addme[*i].bcnt); | |
1344 | #endif | |
1345 | ||
1346 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1347 | ||
1348 | (*i)++; | |
1349 | return 0; | |
1350 | } | |
1351 | ||
1352 | static int | |
336b517f AD |
1353 | do_add_counters(struct net *net, void __user *user, unsigned int len, |
1354 | int compat) | |
1da177e4 LT |
1355 | { |
1356 | unsigned int i; | |
3bc3fe5e PM |
1357 | struct xt_counters_info tmp; |
1358 | struct xt_counters *paddc; | |
1359 | unsigned int num_counters; | |
1360 | char *name; | |
1361 | int size; | |
1362 | void *ptmp; | |
2e4e6a17 | 1363 | struct xt_table *t; |
5452e425 | 1364 | const struct xt_table_info *private; |
6b7d31fc | 1365 | int ret = 0; |
5452e425 | 1366 | const void *loc_cpu_entry; |
3bc3fe5e PM |
1367 | #ifdef CONFIG_COMPAT |
1368 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1369 | |
3bc3fe5e PM |
1370 | if (compat) { |
1371 | ptmp = &compat_tmp; | |
1372 | size = sizeof(struct compat_xt_counters_info); | |
1373 | } else | |
1374 | #endif | |
1375 | { | |
1376 | ptmp = &tmp; | |
1377 | size = sizeof(struct xt_counters_info); | |
1378 | } | |
1379 | ||
1380 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1381 | return -EFAULT; |
1382 | ||
3bc3fe5e PM |
1383 | #ifdef CONFIG_COMPAT |
1384 | if (compat) { | |
1385 | num_counters = compat_tmp.num_counters; | |
1386 | name = compat_tmp.name; | |
1387 | } else | |
1388 | #endif | |
1389 | { | |
1390 | num_counters = tmp.num_counters; | |
1391 | name = tmp.name; | |
1392 | } | |
1393 | ||
1394 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1395 | return -EINVAL; |
1396 | ||
3bc3fe5e | 1397 | paddc = vmalloc_node(len - size, numa_node_id()); |
1da177e4 LT |
1398 | if (!paddc) |
1399 | return -ENOMEM; | |
1400 | ||
3bc3fe5e | 1401 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1402 | ret = -EFAULT; |
1403 | goto free; | |
1404 | } | |
1405 | ||
336b517f | 1406 | t = xt_find_table_lock(net, AF_INET6, name); |
6b7d31fc HW |
1407 | if (!t || IS_ERR(t)) { |
1408 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1409 | goto free; |
6b7d31fc | 1410 | } |
1da177e4 LT |
1411 | |
1412 | write_lock_bh(&t->lock); | |
2e4e6a17 | 1413 | private = t->private; |
3bc3fe5e | 1414 | if (private->number != num_counters) { |
1da177e4 LT |
1415 | ret = -EINVAL; |
1416 | goto unlock_up_free; | |
1417 | } | |
1418 | ||
1419 | i = 0; | |
31836064 | 1420 | /* Choose the copy that is on our node */ |
da4d0f6b | 1421 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 1422 | IP6T_ENTRY_ITERATE(loc_cpu_entry, |
2e4e6a17 | 1423 | private->size, |
1da177e4 | 1424 | add_counter_to_entry, |
3bc3fe5e | 1425 | paddc, |
1da177e4 LT |
1426 | &i); |
1427 | unlock_up_free: | |
1428 | write_unlock_bh(&t->lock); | |
2e4e6a17 | 1429 | xt_table_unlock(t); |
6b7d31fc | 1430 | module_put(t->me); |
1da177e4 LT |
1431 | free: |
1432 | vfree(paddc); | |
1433 | ||
1434 | return ret; | |
1435 | } | |
1436 | ||
3bc3fe5e PM |
1437 | #ifdef CONFIG_COMPAT |
1438 | struct compat_ip6t_replace { | |
1439 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1440 | u32 valid_hooks; | |
1441 | u32 num_entries; | |
1442 | u32 size; | |
1443 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1444 | u32 underflow[NF_INET_NUMHOOKS]; | |
1445 | u32 num_counters; | |
1446 | compat_uptr_t counters; /* struct ip6t_counters * */ | |
1447 | struct compat_ip6t_entry entries[0]; | |
1448 | }; | |
1449 | ||
1450 | static int | |
1451 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1452 | unsigned int *size, struct xt_counters *counters, |
3bc3fe5e PM |
1453 | unsigned int *i) |
1454 | { | |
1455 | struct ip6t_entry_target *t; | |
1456 | struct compat_ip6t_entry __user *ce; | |
1457 | u_int16_t target_offset, next_offset; | |
1458 | compat_uint_t origsize; | |
1459 | int ret; | |
1460 | ||
1461 | ret = -EFAULT; | |
1462 | origsize = *size; | |
1463 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
1464 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry))) | |
1465 | goto out; | |
1466 | ||
1467 | if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i]))) | |
1468 | goto out; | |
1469 | ||
1470 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1471 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1472 | ||
1473 | ret = IP6T_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size); | |
1474 | target_offset = e->target_offset - (origsize - *size); | |
1475 | if (ret) | |
1476 | goto out; | |
1477 | t = ip6t_get_target(e); | |
1478 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1479 | if (ret) | |
1480 | goto out; | |
1481 | ret = -EFAULT; | |
1482 | next_offset = e->next_offset - (origsize - *size); | |
1483 | if (put_user(target_offset, &ce->target_offset)) | |
1484 | goto out; | |
1485 | if (put_user(next_offset, &ce->next_offset)) | |
1486 | goto out; | |
1487 | ||
1488 | (*i)++; | |
1489 | return 0; | |
1490 | out: | |
1491 | return ret; | |
1492 | } | |
1493 | ||
022748a9 | 1494 | static int |
3bc3fe5e PM |
1495 | compat_find_calc_match(struct ip6t_entry_match *m, |
1496 | const char *name, | |
1497 | const struct ip6t_ip6 *ipv6, | |
1498 | unsigned int hookmask, | |
b0a6363c | 1499 | int *size, unsigned int *i) |
3bc3fe5e PM |
1500 | { |
1501 | struct xt_match *match; | |
1502 | ||
1503 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, | |
1504 | m->u.user.revision), | |
1505 | "ip6t_%s", m->u.user.name); | |
1506 | if (IS_ERR(match) || !match) { | |
1507 | duprintf("compat_check_calc_match: `%s' not found\n", | |
1508 | m->u.user.name); | |
1509 | return match ? PTR_ERR(match) : -ENOENT; | |
1510 | } | |
1511 | m->u.kernel.match = match; | |
1512 | *size += xt_compat_match_offset(match); | |
1513 | ||
1514 | (*i)++; | |
1515 | return 0; | |
1516 | } | |
1517 | ||
022748a9 | 1518 | static int |
3bc3fe5e PM |
1519 | compat_release_match(struct ip6t_entry_match *m, unsigned int *i) |
1520 | { | |
1521 | if (i && (*i)-- == 0) | |
1522 | return 1; | |
1523 | ||
1524 | module_put(m->u.kernel.match->me); | |
1525 | return 0; | |
1526 | } | |
1527 | ||
022748a9 | 1528 | static int |
3bc3fe5e PM |
1529 | compat_release_entry(struct compat_ip6t_entry *e, unsigned int *i) |
1530 | { | |
1531 | struct ip6t_entry_target *t; | |
1532 | ||
1533 | if (i && (*i)-- == 0) | |
1534 | return 1; | |
1535 | ||
1536 | /* Cleanup all matches */ | |
1537 | COMPAT_IP6T_MATCH_ITERATE(e, compat_release_match, NULL); | |
1538 | t = compat_ip6t_get_target(e); | |
1539 | module_put(t->u.kernel.target->me); | |
1540 | return 0; | |
1541 | } | |
1542 | ||
022748a9 | 1543 | static int |
3bc3fe5e PM |
1544 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1545 | struct xt_table_info *newinfo, | |
1546 | unsigned int *size, | |
1547 | unsigned char *base, | |
1548 | unsigned char *limit, | |
1549 | unsigned int *hook_entries, | |
1550 | unsigned int *underflows, | |
1551 | unsigned int *i, | |
1552 | const char *name) | |
1553 | { | |
1554 | struct ip6t_entry_target *t; | |
1555 | struct xt_target *target; | |
1556 | unsigned int entry_offset; | |
b0a6363c PM |
1557 | unsigned int j; |
1558 | int ret, off, h; | |
3bc3fe5e PM |
1559 | |
1560 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
1561 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 | |
1562 | || (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
1563 | duprintf("Bad offset %p, limit = %p\n", e, limit); | |
1564 | return -EINVAL; | |
1565 | } | |
1566 | ||
1567 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1568 | sizeof(struct compat_xt_entry_target)) { | |
1569 | duprintf("checking: element %p size %u\n", | |
1570 | e, e->next_offset); | |
1571 | return -EINVAL; | |
1572 | } | |
1573 | ||
1574 | /* For purposes of check_entry casting the compat entry is fine */ | |
1575 | ret = check_entry((struct ip6t_entry *)e, name); | |
1576 | if (ret) | |
1577 | return ret; | |
1578 | ||
1579 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1580 | entry_offset = (void *)e - (void *)base; | |
1581 | j = 0; | |
1582 | ret = COMPAT_IP6T_MATCH_ITERATE(e, compat_find_calc_match, name, | |
1583 | &e->ipv6, e->comefrom, &off, &j); | |
1584 | if (ret != 0) | |
1585 | goto release_matches; | |
1586 | ||
1587 | t = compat_ip6t_get_target(e); | |
1588 | target = try_then_request_module(xt_find_target(AF_INET6, | |
1589 | t->u.user.name, | |
1590 | t->u.user.revision), | |
1591 | "ip6t_%s", t->u.user.name); | |
1592 | if (IS_ERR(target) || !target) { | |
1593 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", | |
1594 | t->u.user.name); | |
1595 | ret = target ? PTR_ERR(target) : -ENOENT; | |
1596 | goto release_matches; | |
1597 | } | |
1598 | t->u.kernel.target = target; | |
1599 | ||
1600 | off += xt_compat_target_offset(target); | |
1601 | *size += off; | |
1602 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1603 | if (ret) | |
1604 | goto out; | |
1605 | ||
1606 | /* Check hooks & underflows */ | |
1607 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1608 | if ((unsigned char *)e - base == hook_entries[h]) | |
1609 | newinfo->hook_entry[h] = hook_entries[h]; | |
1610 | if ((unsigned char *)e - base == underflows[h]) | |
1611 | newinfo->underflow[h] = underflows[h]; | |
1612 | } | |
1613 | ||
1614 | /* Clear counters and comefrom */ | |
1615 | memset(&e->counters, 0, sizeof(e->counters)); | |
1616 | e->comefrom = 0; | |
1617 | ||
1618 | (*i)++; | |
1619 | return 0; | |
1620 | ||
1621 | out: | |
1622 | module_put(t->u.kernel.target->me); | |
1623 | release_matches: | |
1624 | IP6T_MATCH_ITERATE(e, compat_release_match, &j); | |
1625 | return ret; | |
1626 | } | |
1627 | ||
1628 | static int | |
1629 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1630 | unsigned int *size, const char *name, | |
1631 | struct xt_table_info *newinfo, unsigned char *base) | |
1632 | { | |
1633 | struct ip6t_entry_target *t; | |
1634 | struct xt_target *target; | |
1635 | struct ip6t_entry *de; | |
1636 | unsigned int origsize; | |
1637 | int ret, h; | |
1638 | ||
1639 | ret = 0; | |
1640 | origsize = *size; | |
1641 | de = (struct ip6t_entry *)*dstptr; | |
1642 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1643 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1644 | ||
1645 | *dstptr += sizeof(struct ip6t_entry); | |
1646 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1647 | ||
1648 | ret = COMPAT_IP6T_MATCH_ITERATE(e, xt_compat_match_from_user, | |
1649 | dstptr, size); | |
1650 | if (ret) | |
1651 | return ret; | |
1652 | de->target_offset = e->target_offset - (origsize - *size); | |
1653 | t = compat_ip6t_get_target(e); | |
1654 | target = t->u.kernel.target; | |
1655 | xt_compat_target_from_user(t, dstptr, size); | |
1656 | ||
1657 | de->next_offset = e->next_offset - (origsize - *size); | |
1658 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1659 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1660 | newinfo->hook_entry[h] -= origsize - *size; | |
1661 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1662 | newinfo->underflow[h] -= origsize - *size; | |
1663 | } | |
1664 | return ret; | |
1665 | } | |
1666 | ||
022748a9 | 1667 | static int compat_check_entry(struct ip6t_entry *e, const char *name, |
3bc3fe5e PM |
1668 | unsigned int *i) |
1669 | { | |
b0a6363c PM |
1670 | unsigned int j; |
1671 | int ret; | |
3bc3fe5e PM |
1672 | |
1673 | j = 0; | |
1674 | ret = IP6T_MATCH_ITERATE(e, check_match, name, &e->ipv6, | |
1675 | e->comefrom, &j); | |
1676 | if (ret) | |
1677 | goto cleanup_matches; | |
1678 | ||
1679 | ret = check_target(e, name); | |
1680 | if (ret) | |
1681 | goto cleanup_matches; | |
1682 | ||
1683 | (*i)++; | |
1684 | return 0; | |
1685 | ||
1686 | cleanup_matches: | |
1687 | IP6T_MATCH_ITERATE(e, cleanup_match, &j); | |
1688 | return ret; | |
1689 | } | |
1690 | ||
1691 | static int | |
1692 | translate_compat_table(const char *name, | |
1693 | unsigned int valid_hooks, | |
1694 | struct xt_table_info **pinfo, | |
1695 | void **pentry0, | |
1696 | unsigned int total_size, | |
1697 | unsigned int number, | |
1698 | unsigned int *hook_entries, | |
1699 | unsigned int *underflows) | |
1700 | { | |
1701 | unsigned int i, j; | |
1702 | struct xt_table_info *newinfo, *info; | |
1703 | void *pos, *entry0, *entry1; | |
1704 | unsigned int size; | |
1705 | int ret; | |
1706 | ||
1707 | info = *pinfo; | |
1708 | entry0 = *pentry0; | |
1709 | size = total_size; | |
1710 | info->number = number; | |
1711 | ||
1712 | /* Init all hooks to impossible value. */ | |
1713 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1714 | info->hook_entry[i] = 0xFFFFFFFF; | |
1715 | info->underflow[i] = 0xFFFFFFFF; | |
1716 | } | |
1717 | ||
1718 | duprintf("translate_compat_table: size %u\n", info->size); | |
1719 | j = 0; | |
1720 | xt_compat_lock(AF_INET6); | |
1721 | /* Walk through entries, checking offsets. */ | |
1722 | ret = COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size, | |
1723 | check_compat_entry_size_and_hooks, | |
1724 | info, &size, entry0, | |
1725 | entry0 + total_size, | |
1726 | hook_entries, underflows, &j, name); | |
1727 | if (ret != 0) | |
1728 | goto out_unlock; | |
1729 | ||
1730 | ret = -EINVAL; | |
1731 | if (j != number) { | |
1732 | duprintf("translate_compat_table: %u not %u entries\n", | |
1733 | j, number); | |
1734 | goto out_unlock; | |
1735 | } | |
1736 | ||
1737 | /* Check hooks all assigned */ | |
1738 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1739 | /* Only hooks which are valid */ | |
1740 | if (!(valid_hooks & (1 << i))) | |
1741 | continue; | |
1742 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1743 | duprintf("Invalid hook entry %u %u\n", | |
1744 | i, hook_entries[i]); | |
1745 | goto out_unlock; | |
1746 | } | |
1747 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1748 | duprintf("Invalid underflow %u %u\n", | |
1749 | i, underflows[i]); | |
1750 | goto out_unlock; | |
1751 | } | |
1752 | } | |
1753 | ||
1754 | ret = -ENOMEM; | |
1755 | newinfo = xt_alloc_table_info(size); | |
1756 | if (!newinfo) | |
1757 | goto out_unlock; | |
1758 | ||
1759 | newinfo->number = number; | |
1760 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1761 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1762 | newinfo->underflow[i] = info->underflow[i]; | |
1763 | } | |
1764 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1765 | pos = entry1; | |
1766 | size = total_size; | |
1767 | ret = COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size, | |
1768 | compat_copy_entry_from_user, | |
1769 | &pos, &size, name, newinfo, entry1); | |
1770 | xt_compat_flush_offsets(AF_INET6); | |
1771 | xt_compat_unlock(AF_INET6); | |
1772 | if (ret) | |
1773 | goto free_newinfo; | |
1774 | ||
1775 | ret = -ELOOP; | |
1776 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1777 | goto free_newinfo; | |
1778 | ||
1779 | i = 0; | |
1780 | ret = IP6T_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry, | |
1781 | name, &i); | |
1782 | if (ret) { | |
1783 | j -= i; | |
1784 | COMPAT_IP6T_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i, | |
1785 | compat_release_entry, &j); | |
1786 | IP6T_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i); | |
1787 | xt_free_table_info(newinfo); | |
1788 | return ret; | |
1789 | } | |
1790 | ||
1791 | /* And one copy for every other CPU */ | |
1792 | for_each_possible_cpu(i) | |
1793 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1794 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1795 | ||
1796 | *pinfo = newinfo; | |
1797 | *pentry0 = entry1; | |
1798 | xt_free_table_info(info); | |
1799 | return 0; | |
1800 | ||
1801 | free_newinfo: | |
1802 | xt_free_table_info(newinfo); | |
1803 | out: | |
1804 | COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j); | |
1805 | return ret; | |
1806 | out_unlock: | |
1807 | xt_compat_flush_offsets(AF_INET6); | |
1808 | xt_compat_unlock(AF_INET6); | |
1809 | goto out; | |
1810 | } | |
1811 | ||
1812 | static int | |
336b517f | 1813 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1814 | { |
1815 | int ret; | |
1816 | struct compat_ip6t_replace tmp; | |
1817 | struct xt_table_info *newinfo; | |
1818 | void *loc_cpu_entry; | |
1819 | ||
1820 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1821 | return -EFAULT; | |
1822 | ||
1823 | /* overflow check */ | |
1824 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1825 | return -ENOMEM; | |
1826 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1827 | return -ENOMEM; | |
1828 | ||
1829 | newinfo = xt_alloc_table_info(tmp.size); | |
1830 | if (!newinfo) | |
1831 | return -ENOMEM; | |
1832 | ||
9c547959 | 1833 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1834 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1835 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1836 | tmp.size) != 0) { | |
1837 | ret = -EFAULT; | |
1838 | goto free_newinfo; | |
1839 | } | |
1840 | ||
1841 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, | |
1842 | &newinfo, &loc_cpu_entry, tmp.size, | |
1843 | tmp.num_entries, tmp.hook_entry, | |
1844 | tmp.underflow); | |
1845 | if (ret != 0) | |
1846 | goto free_newinfo; | |
1847 | ||
1848 | duprintf("compat_do_replace: Translated table\n"); | |
1849 | ||
336b517f | 1850 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1851 | tmp.num_counters, compat_ptr(tmp.counters)); |
1852 | if (ret) | |
1853 | goto free_newinfo_untrans; | |
1854 | return 0; | |
1855 | ||
1856 | free_newinfo_untrans: | |
1857 | IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); | |
1858 | free_newinfo: | |
1859 | xt_free_table_info(newinfo); | |
1860 | return ret; | |
1861 | } | |
1862 | ||
1863 | static int | |
1864 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1865 | unsigned int len) | |
1866 | { | |
1867 | int ret; | |
1868 | ||
1869 | if (!capable(CAP_NET_ADMIN)) | |
1870 | return -EPERM; | |
1871 | ||
1872 | switch (cmd) { | |
1873 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1874 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1875 | break; |
1876 | ||
1877 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1878 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1879 | break; |
1880 | ||
1881 | default: | |
1882 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1883 | ret = -EINVAL; | |
1884 | } | |
1885 | ||
1886 | return ret; | |
1887 | } | |
1888 | ||
1889 | struct compat_ip6t_get_entries { | |
1890 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1891 | compat_uint_t size; | |
1892 | struct compat_ip6t_entry entrytable[0]; | |
1893 | }; | |
1894 | ||
1895 | static int | |
1896 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1897 | void __user *userptr) | |
1898 | { | |
1899 | struct xt_counters *counters; | |
5452e425 | 1900 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1901 | void __user *pos; |
1902 | unsigned int size; | |
1903 | int ret = 0; | |
5452e425 | 1904 | const void *loc_cpu_entry; |
3bc3fe5e PM |
1905 | unsigned int i = 0; |
1906 | ||
1907 | counters = alloc_counters(table); | |
1908 | if (IS_ERR(counters)) | |
1909 | return PTR_ERR(counters); | |
1910 | ||
1911 | /* choose the copy that is on our node/cpu, ... | |
1912 | * This choice is lazy (because current thread is | |
1913 | * allowed to migrate to another cpu) | |
1914 | */ | |
1915 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1916 | pos = userptr; | |
1917 | size = total_size; | |
1918 | ret = IP6T_ENTRY_ITERATE(loc_cpu_entry, total_size, | |
1919 | compat_copy_entry_to_user, | |
1920 | &pos, &size, counters, &i); | |
1921 | ||
1922 | vfree(counters); | |
1923 | return ret; | |
1924 | } | |
1925 | ||
1926 | static int | |
336b517f AD |
1927 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1928 | int *len) | |
3bc3fe5e PM |
1929 | { |
1930 | int ret; | |
1931 | struct compat_ip6t_get_entries get; | |
1932 | struct xt_table *t; | |
1933 | ||
1934 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1935 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1936 | return -EINVAL; |
1937 | } | |
1938 | ||
1939 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1940 | return -EFAULT; | |
1941 | ||
1942 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1943 | duprintf("compat_get_entries: %u != %zu\n", |
1944 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1945 | return -EINVAL; |
1946 | } | |
1947 | ||
1948 | xt_compat_lock(AF_INET6); | |
336b517f | 1949 | t = xt_find_table_lock(net, AF_INET6, get.name); |
3bc3fe5e | 1950 | if (t && !IS_ERR(t)) { |
5452e425 | 1951 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1952 | struct xt_table_info info; |
9c547959 | 1953 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1954 | ret = compat_table_info(private, &info); |
1955 | if (!ret && get.size == info.size) { | |
1956 | ret = compat_copy_entries_to_user(private->size, | |
1957 | t, uptr->entrytable); | |
1958 | } else if (!ret) { | |
1959 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1960 | private->size, get.size); |
544473c1 | 1961 | ret = -EAGAIN; |
3bc3fe5e PM |
1962 | } |
1963 | xt_compat_flush_offsets(AF_INET6); | |
1964 | module_put(t->me); | |
1965 | xt_table_unlock(t); | |
1966 | } else | |
1967 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1968 | ||
1969 | xt_compat_unlock(AF_INET6); | |
1970 | return ret; | |
1971 | } | |
1972 | ||
1973 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
1974 | ||
1975 | static int | |
1976 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1977 | { | |
1978 | int ret; | |
1979 | ||
1980 | if (!capable(CAP_NET_ADMIN)) | |
1981 | return -EPERM; | |
1982 | ||
1983 | switch (cmd) { | |
1984 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 1985 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1986 | break; |
1987 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 1988 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
1989 | break; |
1990 | default: | |
1991 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
1992 | } | |
1993 | return ret; | |
1994 | } | |
1995 | #endif | |
1996 | ||
1da177e4 LT |
1997 | static int |
1998 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
1999 | { | |
2000 | int ret; | |
2001 | ||
2002 | if (!capable(CAP_NET_ADMIN)) | |
2003 | return -EPERM; | |
2004 | ||
2005 | switch (cmd) { | |
2006 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2007 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2008 | break; |
2009 | ||
2010 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2011 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2012 | break; |
2013 | ||
2014 | default: | |
2015 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2016 | ret = -EINVAL; | |
2017 | } | |
2018 | ||
2019 | return ret; | |
2020 | } | |
2021 | ||
2022 | static int | |
2023 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2024 | { | |
2025 | int ret; | |
2026 | ||
2027 | if (!capable(CAP_NET_ADMIN)) | |
2028 | return -EPERM; | |
2029 | ||
2030 | switch (cmd) { | |
433665c9 | 2031 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2032 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2033 | break; |
1da177e4 | 2034 | |
d924357c | 2035 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2036 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2037 | break; |
1da177e4 | 2038 | |
6b7d31fc HW |
2039 | case IP6T_SO_GET_REVISION_MATCH: |
2040 | case IP6T_SO_GET_REVISION_TARGET: { | |
2041 | struct ip6t_get_revision rev; | |
2e4e6a17 | 2042 | int target; |
6b7d31fc HW |
2043 | |
2044 | if (*len != sizeof(rev)) { | |
2045 | ret = -EINVAL; | |
2046 | break; | |
2047 | } | |
2048 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2049 | ret = -EFAULT; | |
2050 | break; | |
2051 | } | |
2052 | ||
2053 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2054 | target = 1; |
6b7d31fc | 2055 | else |
2e4e6a17 | 2056 | target = 0; |
6b7d31fc | 2057 | |
2e4e6a17 HW |
2058 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2059 | rev.revision, | |
2060 | target, &ret), | |
6b7d31fc HW |
2061 | "ip6t_%s", rev.name); |
2062 | break; | |
2063 | } | |
2064 | ||
1da177e4 LT |
2065 | default: |
2066 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2067 | ret = -EINVAL; | |
2068 | } | |
2069 | ||
2070 | return ret; | |
2071 | } | |
2072 | ||
336b517f AD |
2073 | struct xt_table *ip6t_register_table(struct net *net, struct xt_table *table, |
2074 | const struct ip6t_replace *repl) | |
1da177e4 LT |
2075 | { |
2076 | int ret; | |
2e4e6a17 | 2077 | struct xt_table_info *newinfo; |
259d4e41 | 2078 | struct xt_table_info bootstrap |
1da177e4 | 2079 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2080 | void *loc_cpu_entry; |
a98da11d | 2081 | struct xt_table *new_table; |
1da177e4 | 2082 | |
2e4e6a17 | 2083 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2084 | if (!newinfo) { |
2085 | ret = -ENOMEM; | |
2086 | goto out; | |
2087 | } | |
1da177e4 | 2088 | |
9c547959 | 2089 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2090 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2091 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
2092 | |
2093 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 2094 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
2095 | repl->num_entries, |
2096 | repl->hook_entry, | |
2097 | repl->underflow); | |
44d34e72 AD |
2098 | if (ret != 0) |
2099 | goto out_free; | |
1da177e4 | 2100 | |
336b517f | 2101 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2102 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2103 | ret = PTR_ERR(new_table); |
2104 | goto out_free; | |
1da177e4 | 2105 | } |
44d34e72 | 2106 | return new_table; |
1da177e4 | 2107 | |
44d34e72 AD |
2108 | out_free: |
2109 | xt_free_table_info(newinfo); | |
2110 | out: | |
2111 | return ERR_PTR(ret); | |
1da177e4 LT |
2112 | } |
2113 | ||
2e4e6a17 | 2114 | void ip6t_unregister_table(struct xt_table *table) |
1da177e4 | 2115 | { |
2e4e6a17 | 2116 | struct xt_table_info *private; |
31836064 | 2117 | void *loc_cpu_entry; |
df200969 | 2118 | struct module *table_owner = table->me; |
31836064 | 2119 | |
2e4e6a17 | 2120 | private = xt_unregister_table(table); |
1da177e4 LT |
2121 | |
2122 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
2123 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
2124 | IP6T_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
df200969 AD |
2125 | if (private->number > private->initial_entries) |
2126 | module_put(table_owner); | |
2e4e6a17 | 2127 | xt_free_table_info(private); |
1da177e4 LT |
2128 | } |
2129 | ||
2130 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2131 | static inline bool |
1da177e4 LT |
2132 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2133 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2134 | bool invert) |
1da177e4 LT |
2135 | { |
2136 | return (type == test_type && code >= min_code && code <= max_code) | |
2137 | ^ invert; | |
2138 | } | |
2139 | ||
1d93a9cb | 2140 | static bool |
f7108a20 | 2141 | icmp6_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2142 | { |
5452e425 JE |
2143 | const struct icmp6hdr *ic; |
2144 | struct icmp6hdr _icmph; | |
f7108a20 | 2145 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2146 | |
2147 | /* Must not be a fragment. */ | |
f7108a20 | 2148 | if (par->fragoff != 0) |
1d93a9cb | 2149 | return false; |
1da177e4 | 2150 | |
f7108a20 | 2151 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2152 | if (ic == NULL) { |
2153 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2154 | * can't. Hence, no choice but to drop. |
2155 | */ | |
1da177e4 | 2156 | duprintf("Dropping evil ICMP tinygram.\n"); |
f7108a20 | 2157 | *par->hotdrop = true; |
1d93a9cb | 2158 | return false; |
1da177e4 LT |
2159 | } |
2160 | ||
2161 | return icmp6_type_code_match(icmpinfo->type, | |
2162 | icmpinfo->code[0], | |
2163 | icmpinfo->code[1], | |
2164 | ic->icmp6_type, ic->icmp6_code, | |
2165 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2166 | } | |
2167 | ||
2168 | /* Called when user tries to insert an entry of this type. */ | |
ccb79bdc | 2169 | static bool |
1da177e4 | 2170 | icmp6_checkentry(const char *tablename, |
2e4e6a17 | 2171 | const void *entry, |
c4986734 | 2172 | const struct xt_match *match, |
1da177e4 | 2173 | void *matchinfo, |
1da177e4 LT |
2174 | unsigned int hook_mask) |
2175 | { | |
2176 | const struct ip6t_icmp *icmpinfo = matchinfo; | |
2177 | ||
7f939713 PM |
2178 | /* Must specify no unknown invflags */ |
2179 | return !(icmpinfo->invflags & ~IP6T_ICMP_INV); | |
1da177e4 LT |
2180 | } |
2181 | ||
2182 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2183 | static struct xt_target ip6t_standard_target __read_mostly = { |
1da177e4 | 2184 | .name = IP6T_STANDARD_TARGET, |
7f939713 | 2185 | .targetsize = sizeof(int), |
a45049c5 | 2186 | .family = AF_INET6, |
3bc3fe5e PM |
2187 | #ifdef CONFIG_COMPAT |
2188 | .compatsize = sizeof(compat_int_t), | |
2189 | .compat_from_user = compat_standard_from_user, | |
2190 | .compat_to_user = compat_standard_to_user, | |
2191 | #endif | |
1da177e4 LT |
2192 | }; |
2193 | ||
9f15c530 | 2194 | static struct xt_target ip6t_error_target __read_mostly = { |
1da177e4 LT |
2195 | .name = IP6T_ERROR_TARGET, |
2196 | .target = ip6t_error, | |
7f939713 | 2197 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, |
a45049c5 | 2198 | .family = AF_INET6, |
1da177e4 LT |
2199 | }; |
2200 | ||
2201 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2202 | .pf = PF_INET6, | |
2203 | .set_optmin = IP6T_BASE_CTL, | |
2204 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2205 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2206 | #ifdef CONFIG_COMPAT |
2207 | .compat_set = compat_do_ip6t_set_ctl, | |
2208 | #endif | |
1da177e4 LT |
2209 | .get_optmin = IP6T_BASE_CTL, |
2210 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2211 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2212 | #ifdef CONFIG_COMPAT |
2213 | .compat_get = compat_do_ip6t_get_ctl, | |
2214 | #endif | |
16fcec35 | 2215 | .owner = THIS_MODULE, |
1da177e4 LT |
2216 | }; |
2217 | ||
9f15c530 | 2218 | static struct xt_match icmp6_matchstruct __read_mostly = { |
1da177e4 | 2219 | .name = "icmp6", |
9c547959 | 2220 | .match = icmp6_match, |
7f939713 PM |
2221 | .matchsize = sizeof(struct ip6t_icmp), |
2222 | .checkentry = icmp6_checkentry, | |
2223 | .proto = IPPROTO_ICMPV6, | |
a45049c5 | 2224 | .family = AF_INET6, |
1da177e4 LT |
2225 | }; |
2226 | ||
3cb609d5 AD |
2227 | static int __net_init ip6_tables_net_init(struct net *net) |
2228 | { | |
2229 | return xt_proto_init(net, AF_INET6); | |
2230 | } | |
2231 | ||
2232 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2233 | { | |
2234 | xt_proto_fini(net, AF_INET6); | |
2235 | } | |
2236 | ||
2237 | static struct pernet_operations ip6_tables_net_ops = { | |
2238 | .init = ip6_tables_net_init, | |
2239 | .exit = ip6_tables_net_exit, | |
2240 | }; | |
2241 | ||
65b4b4e8 | 2242 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2243 | { |
2244 | int ret; | |
2245 | ||
3cb609d5 | 2246 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2247 | if (ret < 0) |
2248 | goto err1; | |
2e4e6a17 | 2249 | |
1da177e4 | 2250 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2251 | ret = xt_register_target(&ip6t_standard_target); |
2252 | if (ret < 0) | |
2253 | goto err2; | |
2254 | ret = xt_register_target(&ip6t_error_target); | |
2255 | if (ret < 0) | |
2256 | goto err3; | |
2257 | ret = xt_register_match(&icmp6_matchstruct); | |
2258 | if (ret < 0) | |
2259 | goto err4; | |
1da177e4 LT |
2260 | |
2261 | /* Register setsockopt */ | |
2262 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2263 | if (ret < 0) |
2264 | goto err5; | |
1da177e4 | 2265 | |
a887c1c1 | 2266 | printk(KERN_INFO "ip6_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2267 | return 0; |
0eff66e6 PM |
2268 | |
2269 | err5: | |
2270 | xt_unregister_match(&icmp6_matchstruct); | |
2271 | err4: | |
2272 | xt_unregister_target(&ip6t_error_target); | |
2273 | err3: | |
2274 | xt_unregister_target(&ip6t_standard_target); | |
2275 | err2: | |
3cb609d5 | 2276 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2277 | err1: |
2278 | return ret; | |
1da177e4 LT |
2279 | } |
2280 | ||
65b4b4e8 | 2281 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2282 | { |
2283 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2284 | |
a45049c5 PNA |
2285 | xt_unregister_match(&icmp6_matchstruct); |
2286 | xt_unregister_target(&ip6t_error_target); | |
2287 | xt_unregister_target(&ip6t_standard_target); | |
3cb609d5 AD |
2288 | |
2289 | unregister_pernet_subsys(&ip6_tables_net_ops); | |
1da177e4 LT |
2290 | } |
2291 | ||
e674d0f3 | 2292 | /* |
b777e0ce PM |
2293 | * find the offset to specified header or the protocol number of last header |
2294 | * if target < 0. "last header" is transport protocol header, ESP, or | |
2295 | * "No next header". | |
2296 | * | |
2297 | * If target header is found, its offset is set in *offset and return protocol | |
2298 | * number. Otherwise, return -1. | |
2299 | * | |
6d381634 PM |
2300 | * If the first fragment doesn't contain the final protocol header or |
2301 | * NEXTHDR_NONE it is considered invalid. | |
2302 | * | |
b777e0ce PM |
2303 | * Note that non-1st fragment is special case that "the protocol number |
2304 | * of last header" is "next header" field in Fragment header. In this case, | |
2305 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
2306 | * isn't NULL. | |
e674d0f3 | 2307 | * |
e674d0f3 | 2308 | */ |
b777e0ce PM |
2309 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
2310 | int target, unsigned short *fragoff) | |
e674d0f3 | 2311 | { |
6b88dd96 | 2312 | unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); |
0660e03f | 2313 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
e674d0f3 YK |
2314 | unsigned int len = skb->len - start; |
2315 | ||
b777e0ce PM |
2316 | if (fragoff) |
2317 | *fragoff = 0; | |
2318 | ||
e674d0f3 YK |
2319 | while (nexthdr != target) { |
2320 | struct ipv6_opt_hdr _hdr, *hp; | |
2321 | unsigned int hdrlen; | |
2322 | ||
b777e0ce PM |
2323 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
2324 | if (target < 0) | |
2325 | break; | |
6d381634 | 2326 | return -ENOENT; |
b777e0ce PM |
2327 | } |
2328 | ||
e674d0f3 YK |
2329 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
2330 | if (hp == NULL) | |
6d381634 | 2331 | return -EBADMSG; |
e674d0f3 | 2332 | if (nexthdr == NEXTHDR_FRAGMENT) { |
e69a4adc AV |
2333 | unsigned short _frag_off; |
2334 | __be16 *fp; | |
e674d0f3 YK |
2335 | fp = skb_header_pointer(skb, |
2336 | start+offsetof(struct frag_hdr, | |
2337 | frag_off), | |
2338 | sizeof(_frag_off), | |
2339 | &_frag_off); | |
2340 | if (fp == NULL) | |
6d381634 | 2341 | return -EBADMSG; |
e674d0f3 | 2342 | |
b777e0ce PM |
2343 | _frag_off = ntohs(*fp) & ~0x7; |
2344 | if (_frag_off) { | |
2345 | if (target < 0 && | |
2346 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
337dde79 | 2347 | hp->nexthdr == NEXTHDR_NONE)) { |
b777e0ce PM |
2348 | if (fragoff) |
2349 | *fragoff = _frag_off; | |
2350 | return hp->nexthdr; | |
2351 | } | |
6d381634 | 2352 | return -ENOENT; |
b777e0ce | 2353 | } |
e674d0f3 YK |
2354 | hdrlen = 8; |
2355 | } else if (nexthdr == NEXTHDR_AUTH) | |
1ab1457c | 2356 | hdrlen = (hp->hdrlen + 2) << 2; |
e674d0f3 | 2357 | else |
1ab1457c | 2358 | hdrlen = ipv6_optlen(hp); |
e674d0f3 YK |
2359 | |
2360 | nexthdr = hp->nexthdr; | |
2361 | len -= hdrlen; | |
2362 | start += hdrlen; | |
2363 | } | |
2364 | ||
2365 | *offset = start; | |
b777e0ce | 2366 | return nexthdr; |
e674d0f3 YK |
2367 | } |
2368 | ||
1da177e4 LT |
2369 | EXPORT_SYMBOL(ip6t_register_table); |
2370 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2371 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2372 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 2373 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 2374 | |
65b4b4e8 AM |
2375 | module_init(ip6_tables_init); |
2376 | module_exit(ip6_tables_fini); |