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 | 101 | { |
1da177e4 | 102 | unsigned long ret; |
0660e03f | 103 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
1da177e4 | 104 | |
e79ec50b | 105 | #define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg))) |
1da177e4 | 106 | |
f2ffd9ee | 107 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
1ab1457c | 108 | &ip6info->src), IP6T_INV_SRCIP) |
f2ffd9ee | 109 | || FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, |
1ab1457c | 110 | &ip6info->dst), IP6T_INV_DSTIP)) { |
1da177e4 LT |
111 | dprintf("Source or dest mismatch.\n"); |
112 | /* | |
113 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, | |
114 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, | |
115 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); | |
116 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, | |
117 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, | |
118 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ | |
1d93a9cb | 119 | return false; |
1da177e4 LT |
120 | } |
121 | ||
b8dfe498 | 122 | ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask); |
1da177e4 LT |
123 | |
124 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { | |
125 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
126 | indev, ip6info->iniface, | |
127 | ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":""); | |
1d93a9cb | 128 | return false; |
1da177e4 LT |
129 | } |
130 | ||
b8dfe498 | 131 | ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask); |
1da177e4 LT |
132 | |
133 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { | |
134 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
135 | outdev, ip6info->outiface, | |
136 | ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":""); | |
1d93a9cb | 137 | return false; |
1da177e4 LT |
138 | } |
139 | ||
140 | /* ... might want to do something with class and flowlabel here ... */ | |
141 | ||
142 | /* look for the desired protocol header */ | |
143 | if((ip6info->flags & IP6T_F_PROTO)) { | |
b777e0ce PM |
144 | int protohdr; |
145 | unsigned short _frag_off; | |
1da177e4 | 146 | |
b777e0ce | 147 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off); |
51d8b1a6 PM |
148 | if (protohdr < 0) { |
149 | if (_frag_off == 0) | |
cff533ac | 150 | *hotdrop = true; |
1d93a9cb | 151 | return false; |
51d8b1a6 | 152 | } |
b777e0ce | 153 | *fragoff = _frag_off; |
1da177e4 LT |
154 | |
155 | dprintf("Packet protocol %hi ?= %s%hi.\n", | |
1ab1457c | 156 | protohdr, |
1da177e4 LT |
157 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
158 | ip6info->proto); | |
159 | ||
b777e0ce | 160 | if (ip6info->proto == protohdr) { |
1da177e4 | 161 | if(ip6info->invflags & IP6T_INV_PROTO) { |
1d93a9cb | 162 | return false; |
1da177e4 | 163 | } |
1d93a9cb | 164 | return true; |
1da177e4 LT |
165 | } |
166 | ||
167 | /* We need match for the '-p all', too! */ | |
168 | if ((ip6info->proto != 0) && | |
169 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
1d93a9cb | 170 | return false; |
1da177e4 | 171 | } |
1d93a9cb | 172 | return true; |
1da177e4 LT |
173 | } |
174 | ||
175 | /* should be ip6 safe */ | |
022748a9 | 176 | static bool |
1da177e4 LT |
177 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
178 | { | |
179 | if (ipv6->flags & ~IP6T_F_MASK) { | |
180 | duprintf("Unknown flag bits set: %08X\n", | |
181 | ipv6->flags & ~IP6T_F_MASK); | |
ccb79bdc | 182 | return false; |
1da177e4 LT |
183 | } |
184 | if (ipv6->invflags & ~IP6T_INV_MASK) { | |
185 | duprintf("Unknown invflag bits set: %08X\n", | |
186 | ipv6->invflags & ~IP6T_INV_MASK); | |
ccb79bdc | 187 | return false; |
1da177e4 | 188 | } |
ccb79bdc | 189 | return true; |
1da177e4 LT |
190 | } |
191 | ||
192 | static unsigned int | |
7eb35586 | 193 | ip6t_error(struct sk_buff *skb, const struct xt_target_param *par) |
1da177e4 LT |
194 | { |
195 | if (net_ratelimit()) | |
7eb35586 JE |
196 | printk("ip6_tables: error: `%s'\n", |
197 | (const char *)par->targinfo); | |
1da177e4 LT |
198 | |
199 | return NF_DROP; | |
200 | } | |
201 | ||
022748a9 DV |
202 | /* Performance critical - called for every packet */ |
203 | static inline bool | |
f7108a20 JE |
204 | do_match(struct ip6t_entry_match *m, const struct sk_buff *skb, |
205 | struct xt_match_param *par) | |
1da177e4 | 206 | { |
f7108a20 JE |
207 | par->match = m->u.kernel.match; |
208 | par->matchinfo = m->data; | |
209 | ||
1da177e4 | 210 | /* Stop iteration if it doesn't match */ |
f7108a20 | 211 | if (!m->u.kernel.match->match(skb, par)) |
1d93a9cb | 212 | return true; |
1da177e4 | 213 | else |
1d93a9cb | 214 | return false; |
1da177e4 LT |
215 | } |
216 | ||
217 | static inline struct ip6t_entry * | |
218 | get_entry(void *base, unsigned int offset) | |
219 | { | |
220 | return (struct ip6t_entry *)(base + offset); | |
221 | } | |
222 | ||
ba9dda3a | 223 | /* All zeroes == unconditional rule. */ |
022748a9 | 224 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
225 | static inline int |
226 | unconditional(const struct ip6t_ip6 *ipv6) | |
227 | { | |
228 | unsigned int i; | |
229 | ||
230 | for (i = 0; i < sizeof(*ipv6); i++) | |
231 | if (((char *)ipv6)[i]) | |
232 | break; | |
233 | ||
234 | return (i == sizeof(*ipv6)); | |
235 | } | |
236 | ||
237 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
238 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
239 | /* This cries for unification! */ | |
022748a9 | 240 | static const char *const hooknames[] = { |
6e23ae2a PM |
241 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
242 | [NF_INET_LOCAL_IN] = "INPUT", | |
243 | [NF_INET_FORWARD] = "FORWARD", | |
244 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
245 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
246 | }; |
247 | ||
248 | enum nf_ip_trace_comments { | |
249 | NF_IP6_TRACE_COMMENT_RULE, | |
250 | NF_IP6_TRACE_COMMENT_RETURN, | |
251 | NF_IP6_TRACE_COMMENT_POLICY, | |
252 | }; | |
253 | ||
022748a9 | 254 | static const char *const comments[] = { |
ba9dda3a JK |
255 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
256 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
257 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
258 | }; | |
259 | ||
260 | static struct nf_loginfo trace_loginfo = { | |
261 | .type = NF_LOG_TYPE_LOG, | |
262 | .u = { | |
263 | .log = { | |
264 | .level = 4, | |
265 | .logflags = NF_LOG_MASK, | |
266 | }, | |
267 | }, | |
268 | }; | |
269 | ||
022748a9 | 270 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
271 | static inline int |
272 | get_chainname_rulenum(struct ip6t_entry *s, struct ip6t_entry *e, | |
273 | char *hookname, char **chainname, | |
274 | char **comment, unsigned int *rulenum) | |
275 | { | |
276 | struct ip6t_standard_target *t = (void *)ip6t_get_target(s); | |
277 | ||
278 | if (strcmp(t->target.u.kernel.target->name, IP6T_ERROR_TARGET) == 0) { | |
279 | /* Head of user chain: ERROR target with chainname */ | |
280 | *chainname = t->target.data; | |
281 | (*rulenum) = 0; | |
282 | } else if (s == e) { | |
283 | (*rulenum)++; | |
284 | ||
285 | if (s->target_offset == sizeof(struct ip6t_entry) | |
286 | && strcmp(t->target.u.kernel.target->name, | |
287 | IP6T_STANDARD_TARGET) == 0 | |
288 | && t->verdict < 0 | |
289 | && unconditional(&s->ipv6)) { | |
290 | /* Tail of chains: STANDARD target (return/policy) */ | |
291 | *comment = *chainname == hookname | |
292 | ? (char *)comments[NF_IP6_TRACE_COMMENT_POLICY] | |
293 | : (char *)comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
294 | } | |
295 | return 1; | |
296 | } else | |
297 | (*rulenum)++; | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
302 | static void trace_packet(struct sk_buff *skb, | |
303 | unsigned int hook, | |
304 | const struct net_device *in, | |
305 | const struct net_device *out, | |
ecb6f85e | 306 | const char *tablename, |
ba9dda3a JK |
307 | struct xt_table_info *private, |
308 | struct ip6t_entry *e) | |
309 | { | |
310 | void *table_base; | |
5452e425 | 311 | const struct ip6t_entry *root; |
ba9dda3a JK |
312 | char *hookname, *chainname, *comment; |
313 | unsigned int rulenum = 0; | |
314 | ||
315 | table_base = (void *)private->entries[smp_processor_id()]; | |
316 | root = get_entry(table_base, private->hook_entry[hook]); | |
317 | ||
318 | hookname = chainname = (char *)hooknames[hook]; | |
319 | comment = (char *)comments[NF_IP6_TRACE_COMMENT_RULE]; | |
320 | ||
321 | IP6T_ENTRY_ITERATE(root, | |
322 | private->size - private->hook_entry[hook], | |
323 | get_chainname_rulenum, | |
324 | e, hookname, &chainname, &comment, &rulenum); | |
325 | ||
326 | nf_log_packet(AF_INET6, hook, skb, in, out, &trace_loginfo, | |
327 | "TRACE: %s:%s:%s:%u ", | |
328 | tablename, chainname, comment, rulenum); | |
329 | } | |
330 | #endif | |
331 | ||
1da177e4 LT |
332 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
333 | unsigned int | |
3db05fea | 334 | ip6t_do_table(struct sk_buff *skb, |
1da177e4 LT |
335 | unsigned int hook, |
336 | const struct net_device *in, | |
337 | const struct net_device *out, | |
fe1cb108 | 338 | struct xt_table *table) |
1da177e4 | 339 | { |
6b7d31fc | 340 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
cff533ac | 341 | bool hotdrop = false; |
1da177e4 LT |
342 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
343 | unsigned int verdict = NF_DROP; | |
344 | const char *indev, *outdev; | |
345 | void *table_base; | |
346 | struct ip6t_entry *e, *back; | |
2e4e6a17 | 347 | struct xt_table_info *private; |
f7108a20 | 348 | struct xt_match_param mtpar; |
7eb35586 | 349 | struct xt_target_param tgpar; |
1da177e4 LT |
350 | |
351 | /* Initialization */ | |
352 | indev = in ? in->name : nulldevname; | |
353 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
354 | /* We handle fragments by dealing with the first fragment as |
355 | * if it was a normal packet. All other fragments are treated | |
356 | * normally, except that they will NEVER match rules that ask | |
357 | * things we don't know, ie. tcp syn flag or ports). If the | |
358 | * rule is also a fragment-specific rule, non-fragments won't | |
359 | * match it. */ | |
f7108a20 | 360 | mtpar.hotdrop = &hotdrop; |
7eb35586 JE |
361 | mtpar.in = tgpar.in = in; |
362 | mtpar.out = tgpar.out = out; | |
916a917d | 363 | mtpar.family = tgpar.family = NFPROTO_IPV6; |
7eb35586 | 364 | tgpar.hooknum = hook; |
1da177e4 | 365 | |
1da177e4 | 366 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
78454473 | 367 | |
fa9a86dd | 368 | rcu_read_lock_bh(); |
78454473 SH |
369 | private = rcu_dereference(table->private); |
370 | table_base = rcu_dereference(private->entries[smp_processor_id()]); | |
371 | ||
2e4e6a17 | 372 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 373 | |
1da177e4 | 374 | /* For return from builtin chain */ |
2e4e6a17 | 375 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
376 | |
377 | do { | |
378 | IP_NF_ASSERT(e); | |
379 | IP_NF_ASSERT(back); | |
3db05fea | 380 | if (ip6_packet_match(skb, indev, outdev, &e->ipv6, |
f7108a20 | 381 | &mtpar.thoff, &mtpar.fragoff, &hotdrop)) { |
1da177e4 LT |
382 | struct ip6t_entry_target *t; |
383 | ||
f7108a20 | 384 | if (IP6T_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) |
1da177e4 LT |
385 | goto no_match; |
386 | ||
387 | ADD_COUNTER(e->counters, | |
72f36ec1 PM |
388 | ntohs(ipv6_hdr(skb)->payload_len) + |
389 | sizeof(struct ipv6hdr), 1); | |
1da177e4 LT |
390 | |
391 | t = ip6t_get_target(e); | |
392 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
393 | |
394 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
395 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
396 | /* The packet is traced: log it */ | |
3db05fea HX |
397 | if (unlikely(skb->nf_trace)) |
398 | trace_packet(skb, hook, in, out, | |
ba9dda3a JK |
399 | table->name, private, e); |
400 | #endif | |
1da177e4 LT |
401 | /* Standard target? */ |
402 | if (!t->u.kernel.target->target) { | |
403 | int v; | |
404 | ||
405 | v = ((struct ip6t_standard_target *)t)->verdict; | |
406 | if (v < 0) { | |
407 | /* Pop from stack? */ | |
408 | if (v != IP6T_RETURN) { | |
409 | verdict = (unsigned)(-v) - 1; | |
410 | break; | |
411 | } | |
412 | e = back; | |
413 | back = get_entry(table_base, | |
414 | back->comefrom); | |
415 | continue; | |
416 | } | |
05465343 PM |
417 | if (table_base + v != (void *)e + e->next_offset |
418 | && !(e->ipv6.flags & IP6T_F_GOTO)) { | |
1da177e4 LT |
419 | /* Save old back ptr in next entry */ |
420 | struct ip6t_entry *next | |
421 | = (void *)e + e->next_offset; | |
422 | next->comefrom | |
423 | = (void *)back - table_base; | |
424 | /* set back pointer to next entry */ | |
425 | back = next; | |
426 | } | |
427 | ||
428 | e = get_entry(table_base, v); | |
429 | } else { | |
430 | /* Targets which reenter must return | |
1ab1457c | 431 | abs. verdicts */ |
7eb35586 JE |
432 | tgpar.target = t->u.kernel.target; |
433 | tgpar.targinfo = t->data; | |
434 | ||
1da177e4 LT |
435 | #ifdef CONFIG_NETFILTER_DEBUG |
436 | ((struct ip6t_entry *)table_base)->comefrom | |
437 | = 0xeeeeeeec; | |
438 | #endif | |
3db05fea | 439 | verdict = t->u.kernel.target->target(skb, |
7eb35586 | 440 | &tgpar); |
1da177e4 LT |
441 | |
442 | #ifdef CONFIG_NETFILTER_DEBUG | |
443 | if (((struct ip6t_entry *)table_base)->comefrom | |
444 | != 0xeeeeeeec | |
445 | && verdict == IP6T_CONTINUE) { | |
446 | printk("Target %s reentered!\n", | |
447 | t->u.kernel.target->name); | |
448 | verdict = NF_DROP; | |
449 | } | |
450 | ((struct ip6t_entry *)table_base)->comefrom | |
451 | = 0x57acc001; | |
452 | #endif | |
453 | if (verdict == IP6T_CONTINUE) | |
454 | e = (void *)e + e->next_offset; | |
455 | else | |
456 | /* Verdict */ | |
457 | break; | |
458 | } | |
459 | } else { | |
460 | ||
461 | no_match: | |
462 | e = (void *)e + e->next_offset; | |
463 | } | |
464 | } while (!hotdrop); | |
465 | ||
466 | #ifdef CONFIG_NETFILTER_DEBUG | |
4bdbf6c0 | 467 | ((struct ip6t_entry *)table_base)->comefrom = NETFILTER_LINK_POISON; |
1da177e4 | 468 | #endif |
fa9a86dd | 469 | rcu_read_unlock_bh(); |
1da177e4 LT |
470 | |
471 | #ifdef DEBUG_ALLOW_ALL | |
472 | return NF_ACCEPT; | |
473 | #else | |
474 | if (hotdrop) | |
475 | return NF_DROP; | |
476 | else return verdict; | |
477 | #endif | |
478 | } | |
479 | ||
1da177e4 LT |
480 | /* Figures out from what hook each rule can be called: returns 0 if |
481 | there are loops. Puts hook bitmask in comefrom. */ | |
482 | static int | |
2e4e6a17 | 483 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 484 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
485 | { |
486 | unsigned int hook; | |
487 | ||
488 | /* No recursion; use packet counter to save back ptrs (reset | |
489 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 490 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 491 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 492 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
493 | |
494 | if (!(valid_hooks & (1 << hook))) | |
495 | continue; | |
496 | ||
497 | /* Set initial back pointer. */ | |
498 | e->counters.pcnt = pos; | |
499 | ||
500 | for (;;) { | |
501 | struct ip6t_standard_target *t | |
502 | = (void *)ip6t_get_target(e); | |
9c547959 | 503 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 504 | |
6e23ae2a | 505 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
506 | printk("iptables: loop hook %u pos %u %08X.\n", |
507 | hook, pos, e->comefrom); | |
508 | return 0; | |
509 | } | |
9c547959 | 510 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
511 | |
512 | /* Unconditional return/END. */ | |
e1b4b9f3 | 513 | if ((e->target_offset == sizeof(struct ip6t_entry) |
1da177e4 LT |
514 | && (strcmp(t->target.u.user.name, |
515 | IP6T_STANDARD_TARGET) == 0) | |
516 | && t->verdict < 0 | |
e1b4b9f3 | 517 | && unconditional(&e->ipv6)) || visited) { |
1da177e4 LT |
518 | unsigned int oldpos, size; |
519 | ||
1f9352ae PM |
520 | if ((strcmp(t->target.u.user.name, |
521 | IP6T_STANDARD_TARGET) == 0) && | |
522 | t->verdict < -NF_MAX_VERDICT - 1) { | |
74c9c0c1 DM |
523 | duprintf("mark_source_chains: bad " |
524 | "negative verdict (%i)\n", | |
525 | t->verdict); | |
526 | return 0; | |
527 | } | |
528 | ||
1da177e4 LT |
529 | /* Return: backtrack through the last |
530 | big jump. */ | |
531 | do { | |
6e23ae2a | 532 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
533 | #ifdef DEBUG_IP_FIREWALL_USER |
534 | if (e->comefrom | |
6e23ae2a | 535 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
536 | duprintf("Back unset " |
537 | "on hook %u " | |
538 | "rule %u\n", | |
539 | hook, pos); | |
540 | } | |
541 | #endif | |
542 | oldpos = pos; | |
543 | pos = e->counters.pcnt; | |
544 | e->counters.pcnt = 0; | |
545 | ||
546 | /* We're at the start. */ | |
547 | if (pos == oldpos) | |
548 | goto next; | |
549 | ||
550 | e = (struct ip6t_entry *) | |
31836064 | 551 | (entry0 + pos); |
1da177e4 LT |
552 | } while (oldpos == pos + e->next_offset); |
553 | ||
554 | /* Move along one */ | |
555 | size = e->next_offset; | |
556 | e = (struct ip6t_entry *) | |
31836064 | 557 | (entry0 + pos + size); |
1da177e4 LT |
558 | e->counters.pcnt = pos; |
559 | pos += size; | |
560 | } else { | |
561 | int newpos = t->verdict; | |
562 | ||
563 | if (strcmp(t->target.u.user.name, | |
564 | IP6T_STANDARD_TARGET) == 0 | |
565 | && newpos >= 0) { | |
74c9c0c1 DM |
566 | if (newpos > newinfo->size - |
567 | sizeof(struct ip6t_entry)) { | |
568 | duprintf("mark_source_chains: " | |
569 | "bad verdict (%i)\n", | |
570 | newpos); | |
571 | return 0; | |
572 | } | |
1da177e4 LT |
573 | /* This a jump; chase it. */ |
574 | duprintf("Jump rule %u -> %u\n", | |
575 | pos, newpos); | |
576 | } else { | |
577 | /* ... this is a fallthru */ | |
578 | newpos = pos + e->next_offset; | |
579 | } | |
580 | e = (struct ip6t_entry *) | |
31836064 | 581 | (entry0 + newpos); |
1da177e4 LT |
582 | e->counters.pcnt = pos; |
583 | pos = newpos; | |
584 | } | |
585 | } | |
586 | next: | |
587 | duprintf("Finished chain %u\n", hook); | |
588 | } | |
589 | return 1; | |
590 | } | |
591 | ||
022748a9 | 592 | static int |
1da177e4 LT |
593 | cleanup_match(struct ip6t_entry_match *m, unsigned int *i) |
594 | { | |
6be3d859 JE |
595 | struct xt_mtdtor_param par; |
596 | ||
1da177e4 LT |
597 | if (i && (*i)-- == 0) |
598 | return 1; | |
599 | ||
6be3d859 JE |
600 | par.match = m->u.kernel.match; |
601 | par.matchinfo = m->data; | |
916a917d | 602 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
603 | if (par.match->destroy != NULL) |
604 | par.match->destroy(&par); | |
605 | module_put(par.match->me); | |
1da177e4 LT |
606 | return 0; |
607 | } | |
608 | ||
022748a9 | 609 | static int |
f173c8a1 PM |
610 | check_entry(struct ip6t_entry *e, const char *name) |
611 | { | |
612 | struct ip6t_entry_target *t; | |
613 | ||
614 | if (!ip6_checkentry(&e->ipv6)) { | |
615 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
616 | return -EINVAL; | |
617 | } | |
618 | ||
619 | if (e->target_offset + sizeof(struct ip6t_entry_target) > | |
620 | e->next_offset) | |
621 | return -EINVAL; | |
622 | ||
623 | t = ip6t_get_target(e); | |
624 | if (e->target_offset + t->u.target_size > e->next_offset) | |
625 | return -EINVAL; | |
626 | ||
627 | return 0; | |
628 | } | |
629 | ||
9b4fce7a JE |
630 | static int check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par, |
631 | unsigned int *i) | |
f173c8a1 | 632 | { |
9b4fce7a | 633 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
634 | int ret; |
635 | ||
9b4fce7a JE |
636 | par->match = m->u.kernel.match; |
637 | par->matchinfo = m->data; | |
638 | ||
916a917d | 639 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 640 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
367c6790 | 641 | if (ret < 0) { |
f173c8a1 | 642 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 643 | par.match->name); |
367c6790 | 644 | return ret; |
f173c8a1 | 645 | } |
367c6790 JE |
646 | ++*i; |
647 | return 0; | |
f173c8a1 PM |
648 | } |
649 | ||
022748a9 | 650 | static int |
9b4fce7a | 651 | find_check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par, |
f173c8a1 | 652 | unsigned int *i) |
1da177e4 | 653 | { |
6709dbbb | 654 | struct xt_match *match; |
3cdc7c95 | 655 | int ret; |
1da177e4 | 656 | |
2e4e6a17 | 657 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, |
9c547959 | 658 | m->u.user.revision), |
6b7d31fc HW |
659 | "ip6t_%s", m->u.user.name); |
660 | if (IS_ERR(match) || !match) { | |
f173c8a1 | 661 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
6b7d31fc | 662 | return match ? PTR_ERR(match) : -ENOENT; |
1da177e4 LT |
663 | } |
664 | m->u.kernel.match = match; | |
1da177e4 | 665 | |
9b4fce7a | 666 | ret = check_match(m, par, i); |
3cdc7c95 PM |
667 | if (ret) |
668 | goto err; | |
669 | ||
1da177e4 | 670 | return 0; |
3cdc7c95 PM |
671 | err: |
672 | module_put(m->u.kernel.match->me); | |
673 | return ret; | |
1da177e4 LT |
674 | } |
675 | ||
022748a9 | 676 | static int check_target(struct ip6t_entry *e, const char *name) |
1da177e4 | 677 | { |
af5d6dc2 JE |
678 | struct ip6t_entry_target *t = ip6t_get_target(e); |
679 | struct xt_tgchk_param par = { | |
680 | .table = name, | |
681 | .entryinfo = e, | |
682 | .target = t->u.kernel.target, | |
683 | .targinfo = t->data, | |
684 | .hook_mask = e->comefrom, | |
916a917d | 685 | .family = NFPROTO_IPV6, |
af5d6dc2 | 686 | }; |
1da177e4 | 687 | int ret; |
1da177e4 | 688 | |
f173c8a1 | 689 | t = ip6t_get_target(e); |
916a917d | 690 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 691 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
367c6790 | 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; | |
9b4fce7a | 708 | struct xt_mtchk_param mtpar; |
f173c8a1 PM |
709 | |
710 | ret = check_entry(e, name); | |
711 | if (ret) | |
712 | return ret; | |
590bdf7f | 713 | |
1da177e4 | 714 | j = 0; |
9b4fce7a JE |
715 | mtpar.table = name; |
716 | mtpar.entryinfo = &e->ipv6; | |
717 | mtpar.hook_mask = e->comefrom; | |
916a917d | 718 | mtpar.family = NFPROTO_IPV6; |
9b4fce7a | 719 | ret = IP6T_MATCH_ITERATE(e, find_check_match, &mtpar, &j); |
1da177e4 LT |
720 | if (ret != 0) |
721 | goto cleanup_matches; | |
722 | ||
723 | t = ip6t_get_target(e); | |
2e4e6a17 HW |
724 | target = try_then_request_module(xt_find_target(AF_INET6, |
725 | t->u.user.name, | |
726 | t->u.user.revision), | |
6b7d31fc HW |
727 | "ip6t_%s", t->u.user.name); |
728 | if (IS_ERR(target) || !target) { | |
f173c8a1 | 729 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
6b7d31fc | 730 | ret = target ? PTR_ERR(target) : -ENOENT; |
1da177e4 LT |
731 | goto cleanup_matches; |
732 | } | |
733 | t->u.kernel.target = target; | |
6b7d31fc | 734 | |
f173c8a1 | 735 | ret = check_target(e, name); |
3cdc7c95 PM |
736 | if (ret) |
737 | goto err; | |
738 | ||
1da177e4 LT |
739 | (*i)++; |
740 | return 0; | |
3cdc7c95 PM |
741 | err: |
742 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
743 | cleanup_matches: |
744 | IP6T_MATCH_ITERATE(e, cleanup_match, &j); | |
745 | return ret; | |
746 | } | |
747 | ||
022748a9 | 748 | static int |
1da177e4 | 749 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 750 | struct xt_table_info *newinfo, |
1da177e4 LT |
751 | unsigned char *base, |
752 | unsigned char *limit, | |
753 | const unsigned int *hook_entries, | |
754 | const unsigned int *underflows, | |
755 | unsigned int *i) | |
756 | { | |
757 | unsigned int h; | |
758 | ||
759 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 | |
760 | || (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
761 | duprintf("Bad offset %p\n", e); | |
762 | return -EINVAL; | |
763 | } | |
764 | ||
765 | if (e->next_offset | |
766 | < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) { | |
767 | duprintf("checking: element %p size %u\n", | |
768 | e, e->next_offset); | |
769 | return -EINVAL; | |
770 | } | |
771 | ||
772 | /* Check hooks & underflows */ | |
6e23ae2a | 773 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
1da177e4 LT |
774 | if ((unsigned char *)e - base == hook_entries[h]) |
775 | newinfo->hook_entry[h] = hook_entries[h]; | |
776 | if ((unsigned char *)e - base == underflows[h]) | |
777 | newinfo->underflow[h] = underflows[h]; | |
778 | } | |
779 | ||
780 | /* FIXME: underflows must be unconditional, standard verdicts | |
1ab1457c | 781 | < 0 (not IP6T_RETURN). --RR */ |
1da177e4 LT |
782 | |
783 | /* Clear counters and comefrom */ | |
2e4e6a17 | 784 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
785 | e->comefrom = 0; |
786 | ||
787 | (*i)++; | |
788 | return 0; | |
789 | } | |
790 | ||
022748a9 | 791 | static int |
1da177e4 LT |
792 | cleanup_entry(struct ip6t_entry *e, unsigned int *i) |
793 | { | |
a2df1648 | 794 | struct xt_tgdtor_param par; |
1da177e4 LT |
795 | struct ip6t_entry_target *t; |
796 | ||
797 | if (i && (*i)-- == 0) | |
798 | return 1; | |
799 | ||
800 | /* Cleanup all matches */ | |
801 | IP6T_MATCH_ITERATE(e, cleanup_match, NULL); | |
802 | t = ip6t_get_target(e); | |
a2df1648 JE |
803 | |
804 | par.target = t->u.kernel.target; | |
805 | par.targinfo = t->data; | |
916a917d | 806 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
807 | if (par.target->destroy != NULL) |
808 | par.target->destroy(&par); | |
809 | module_put(par.target->me); | |
1da177e4 LT |
810 | return 0; |
811 | } | |
812 | ||
813 | /* Checks and translates the user-supplied table segment (held in | |
814 | newinfo) */ | |
815 | static int | |
816 | translate_table(const char *name, | |
817 | unsigned int valid_hooks, | |
2e4e6a17 | 818 | struct xt_table_info *newinfo, |
31836064 | 819 | void *entry0, |
1da177e4 LT |
820 | unsigned int size, |
821 | unsigned int number, | |
822 | const unsigned int *hook_entries, | |
823 | const unsigned int *underflows) | |
824 | { | |
825 | unsigned int i; | |
826 | int ret; | |
827 | ||
828 | newinfo->size = size; | |
829 | newinfo->number = number; | |
830 | ||
831 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 832 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
833 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
834 | newinfo->underflow[i] = 0xFFFFFFFF; | |
835 | } | |
836 | ||
837 | duprintf("translate_table: size %u\n", newinfo->size); | |
838 | i = 0; | |
839 | /* Walk through entries, checking offsets. */ | |
31836064 | 840 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
841 | check_entry_size_and_hooks, |
842 | newinfo, | |
31836064 ED |
843 | entry0, |
844 | entry0 + size, | |
1da177e4 LT |
845 | hook_entries, underflows, &i); |
846 | if (ret != 0) | |
847 | return ret; | |
848 | ||
849 | if (i != number) { | |
850 | duprintf("translate_table: %u not %u entries\n", | |
851 | i, number); | |
852 | return -EINVAL; | |
853 | } | |
854 | ||
855 | /* Check hooks all assigned */ | |
6e23ae2a | 856 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
857 | /* Only hooks which are valid */ |
858 | if (!(valid_hooks & (1 << i))) | |
859 | continue; | |
860 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
861 | duprintf("Invalid hook entry %u %u\n", | |
862 | i, hook_entries[i]); | |
863 | return -EINVAL; | |
864 | } | |
865 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
866 | duprintf("Invalid underflow %u %u\n", | |
867 | i, underflows[i]); | |
868 | return -EINVAL; | |
869 | } | |
870 | } | |
871 | ||
74c9c0c1 DM |
872 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
873 | return -ELOOP; | |
874 | ||
1da177e4 LT |
875 | /* Finally, each sanity check must pass */ |
876 | i = 0; | |
31836064 | 877 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
f173c8a1 | 878 | find_check_entry, name, size, &i); |
1da177e4 | 879 | |
74c9c0c1 DM |
880 | if (ret != 0) { |
881 | IP6T_ENTRY_ITERATE(entry0, newinfo->size, | |
882 | cleanup_entry, &i); | |
883 | return ret; | |
884 | } | |
1da177e4 LT |
885 | |
886 | /* And one copy for every other CPU */ | |
6f912042 | 887 | for_each_possible_cpu(i) { |
31836064 ED |
888 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
889 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
890 | } |
891 | ||
9c547959 | 892 | return ret; |
1da177e4 LT |
893 | } |
894 | ||
1da177e4 LT |
895 | /* Gets counters. */ |
896 | static inline int | |
897 | add_entry_to_counter(const struct ip6t_entry *e, | |
2e4e6a17 | 898 | struct xt_counters total[], |
1da177e4 LT |
899 | unsigned int *i) |
900 | { | |
901 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
902 | ||
903 | (*i)++; | |
904 | return 0; | |
905 | } | |
906 | ||
31836064 ED |
907 | static inline int |
908 | set_entry_to_counter(const struct ip6t_entry *e, | |
909 | struct ip6t_counters total[], | |
910 | unsigned int *i) | |
911 | { | |
912 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
913 | ||
914 | (*i)++; | |
915 | return 0; | |
916 | } | |
917 | ||
1da177e4 | 918 | static void |
2e4e6a17 HW |
919 | get_counters(const struct xt_table_info *t, |
920 | struct xt_counters counters[]) | |
1da177e4 LT |
921 | { |
922 | unsigned int cpu; | |
923 | unsigned int i; | |
31836064 ED |
924 | unsigned int curcpu; |
925 | ||
926 | /* Instead of clearing (by a previous call to memset()) | |
927 | * the counters and using adds, we set the counters | |
928 | * with data used by 'current' CPU | |
929 | * We dont care about preemption here. | |
930 | */ | |
931 | curcpu = raw_smp_processor_id(); | |
932 | ||
933 | i = 0; | |
934 | IP6T_ENTRY_ITERATE(t->entries[curcpu], | |
935 | t->size, | |
936 | set_entry_to_counter, | |
937 | counters, | |
938 | &i); | |
1da177e4 | 939 | |
6f912042 | 940 | for_each_possible_cpu(cpu) { |
31836064 ED |
941 | if (cpu == curcpu) |
942 | continue; | |
1da177e4 | 943 | i = 0; |
31836064 | 944 | IP6T_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
945 | t->size, |
946 | add_entry_to_counter, | |
947 | counters, | |
948 | &i); | |
949 | } | |
950 | } | |
951 | ||
78454473 SH |
952 | /* We're lazy, and add to the first CPU; overflow works its fey magic |
953 | * and everything is OK. */ | |
954 | static int | |
955 | add_counter_to_entry(struct ip6t_entry *e, | |
956 | const struct xt_counters addme[], | |
957 | unsigned int *i) | |
958 | { | |
959 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
960 | ||
961 | (*i)++; | |
962 | return 0; | |
963 | } | |
964 | ||
965 | /* Take values from counters and add them back onto the current cpu */ | |
966 | static void put_counters(struct xt_table_info *t, | |
967 | const struct xt_counters counters[]) | |
968 | { | |
969 | unsigned int i, cpu; | |
970 | ||
971 | local_bh_disable(); | |
972 | cpu = smp_processor_id(); | |
973 | i = 0; | |
974 | IP6T_ENTRY_ITERATE(t->entries[cpu], | |
975 | t->size, | |
976 | add_counter_to_entry, | |
977 | counters, | |
978 | &i); | |
979 | local_bh_enable(); | |
980 | } | |
981 | ||
982 | static inline int | |
983 | zero_entry_counter(struct ip6t_entry *e, void *arg) | |
984 | { | |
985 | e->counters.bcnt = 0; | |
986 | e->counters.pcnt = 0; | |
987 | return 0; | |
988 | } | |
989 | ||
990 | static void | |
991 | clone_counters(struct xt_table_info *newinfo, const struct xt_table_info *info) | |
992 | { | |
993 | unsigned int cpu; | |
994 | const void *loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
995 | ||
996 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
997 | for_each_possible_cpu(cpu) { | |
998 | memcpy(newinfo->entries[cpu], loc_cpu_entry, info->size); | |
999 | IP6T_ENTRY_ITERATE(newinfo->entries[cpu], newinfo->size, | |
1000 | zero_entry_counter, NULL); | |
1001 | } | |
1002 | } | |
1003 | ||
022748a9 | 1004 | static struct xt_counters *alloc_counters(struct xt_table *table) |
1da177e4 | 1005 | { |
ed1a6f5e | 1006 | unsigned int countersize; |
2e4e6a17 | 1007 | struct xt_counters *counters; |
78454473 SH |
1008 | struct xt_table_info *private = table->private; |
1009 | struct xt_table_info *info; | |
1da177e4 LT |
1010 | |
1011 | /* We need atomic snapshot of counters: rest doesn't change | |
1012 | (other than comefrom, which userspace doesn't care | |
1013 | about). */ | |
2e4e6a17 | 1014 | countersize = sizeof(struct xt_counters) * private->number; |
3b84e92b | 1015 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
1016 | |
1017 | if (counters == NULL) | |
78454473 | 1018 | goto nomem; |
1da177e4 | 1019 | |
78454473 SH |
1020 | info = xt_alloc_table_info(private->size); |
1021 | if (!info) | |
1022 | goto free_counters; | |
1023 | ||
1024 | clone_counters(info, private); | |
1025 | ||
1026 | mutex_lock(&table->lock); | |
1027 | xt_table_entry_swap_rcu(private, info); | |
1028 | synchronize_net(); /* Wait until smoke has cleared */ | |
1029 | ||
1030 | get_counters(info, counters); | |
1031 | put_counters(private, counters); | |
1032 | mutex_unlock(&table->lock); | |
1da177e4 | 1033 | |
78454473 SH |
1034 | xt_free_table_info(info); |
1035 | ||
49a88d18 ED |
1036 | return counters; |
1037 | ||
78454473 SH |
1038 | free_counters: |
1039 | vfree(counters); | |
1040 | nomem: | |
1041 | return ERR_PTR(-ENOMEM); | |
ed1a6f5e PM |
1042 | } |
1043 | ||
1044 | static int | |
1045 | copy_entries_to_user(unsigned int total_size, | |
1046 | struct xt_table *table, | |
1047 | void __user *userptr) | |
1048 | { | |
1049 | unsigned int off, num; | |
1050 | struct ip6t_entry *e; | |
1051 | struct xt_counters *counters; | |
5452e425 | 1052 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 1053 | int ret = 0; |
5452e425 | 1054 | const void *loc_cpu_entry; |
ed1a6f5e PM |
1055 | |
1056 | counters = alloc_counters(table); | |
1057 | if (IS_ERR(counters)) | |
1058 | return PTR_ERR(counters); | |
1059 | ||
9c547959 PM |
1060 | /* choose the copy that is on our node/cpu, ... |
1061 | * This choice is lazy (because current thread is | |
1062 | * allowed to migrate to another cpu) | |
1063 | */ | |
2e4e6a17 | 1064 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 1065 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
1066 | ret = -EFAULT; |
1067 | goto free_counters; | |
1068 | } | |
1069 | ||
1070 | /* FIXME: use iterator macros --RR */ | |
1071 | /* ... then go back and fix counters and names */ | |
1072 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
1073 | unsigned int i; | |
5452e425 JE |
1074 | const struct ip6t_entry_match *m; |
1075 | const struct ip6t_entry_target *t; | |
1da177e4 | 1076 | |
31836064 | 1077 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
1078 | if (copy_to_user(userptr + off |
1079 | + offsetof(struct ip6t_entry, counters), | |
1080 | &counters[num], | |
1081 | sizeof(counters[num])) != 0) { | |
1082 | ret = -EFAULT; | |
1083 | goto free_counters; | |
1084 | } | |
1085 | ||
1086 | for (i = sizeof(struct ip6t_entry); | |
1087 | i < e->target_offset; | |
1088 | i += m->u.match_size) { | |
1089 | m = (void *)e + i; | |
1090 | ||
1091 | if (copy_to_user(userptr + off + i | |
1092 | + offsetof(struct ip6t_entry_match, | |
1093 | u.user.name), | |
1094 | m->u.kernel.match->name, | |
1095 | strlen(m->u.kernel.match->name)+1) | |
1096 | != 0) { | |
1097 | ret = -EFAULT; | |
1098 | goto free_counters; | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | t = ip6t_get_target(e); | |
1103 | if (copy_to_user(userptr + off + e->target_offset | |
1104 | + offsetof(struct ip6t_entry_target, | |
1105 | u.user.name), | |
1106 | t->u.kernel.target->name, | |
1107 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1108 | ret = -EFAULT; | |
1109 | goto free_counters; | |
1110 | } | |
1111 | } | |
1112 | ||
1113 | free_counters: | |
1114 | vfree(counters); | |
1115 | return ret; | |
1116 | } | |
1117 | ||
3bc3fe5e PM |
1118 | #ifdef CONFIG_COMPAT |
1119 | static void compat_standard_from_user(void *dst, void *src) | |
1120 | { | |
1121 | int v = *(compat_int_t *)src; | |
1122 | ||
1123 | if (v > 0) | |
1124 | v += xt_compat_calc_jump(AF_INET6, v); | |
1125 | memcpy(dst, &v, sizeof(v)); | |
1126 | } | |
1127 | ||
1128 | static int compat_standard_to_user(void __user *dst, void *src) | |
1129 | { | |
1130 | compat_int_t cv = *(int *)src; | |
1131 | ||
1132 | if (cv > 0) | |
1133 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1134 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1135 | } | |
1136 | ||
1137 | static inline int | |
1138 | compat_calc_match(struct ip6t_entry_match *m, int *size) | |
1139 | { | |
1140 | *size += xt_compat_match_offset(m->u.kernel.match); | |
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | static int compat_calc_entry(struct ip6t_entry *e, | |
1145 | const struct xt_table_info *info, | |
1146 | void *base, struct xt_table_info *newinfo) | |
1147 | { | |
1148 | struct ip6t_entry_target *t; | |
1149 | unsigned int entry_offset; | |
1150 | int off, i, ret; | |
1151 | ||
1152 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1153 | entry_offset = (void *)e - base; | |
1154 | IP6T_MATCH_ITERATE(e, compat_calc_match, &off); | |
1155 | t = ip6t_get_target(e); | |
1156 | off += xt_compat_target_offset(t->u.kernel.target); | |
1157 | newinfo->size -= off; | |
1158 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1159 | if (ret) | |
1160 | return ret; | |
1161 | ||
1162 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1163 | if (info->hook_entry[i] && | |
1164 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1165 | newinfo->hook_entry[i] -= off; | |
1166 | if (info->underflow[i] && | |
1167 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1168 | newinfo->underflow[i] -= off; | |
1169 | } | |
1170 | return 0; | |
1171 | } | |
1172 | ||
1173 | static int compat_table_info(const struct xt_table_info *info, | |
1174 | struct xt_table_info *newinfo) | |
1175 | { | |
1176 | void *loc_cpu_entry; | |
1177 | ||
1178 | if (!newinfo || !info) | |
1179 | return -EINVAL; | |
1180 | ||
1181 | /* we dont care about newinfo->entries[] */ | |
1182 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1183 | newinfo->initial_entries = 0; | |
1184 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
1185 | return IP6T_ENTRY_ITERATE(loc_cpu_entry, info->size, | |
1186 | compat_calc_entry, info, loc_cpu_entry, | |
1187 | newinfo); | |
1188 | } | |
1189 | #endif | |
1190 | ||
336b517f | 1191 | static int get_info(struct net *net, void __user *user, int *len, int compat) |
433665c9 PM |
1192 | { |
1193 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1194 | struct xt_table *t; | |
1195 | int ret; | |
1196 | ||
1197 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1198 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1199 | sizeof(struct ip6t_getinfo)); |
1200 | return -EINVAL; | |
1201 | } | |
1202 | ||
1203 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1204 | return -EFAULT; | |
1205 | ||
1206 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; | |
3bc3fe5e PM |
1207 | #ifdef CONFIG_COMPAT |
1208 | if (compat) | |
1209 | xt_compat_lock(AF_INET6); | |
1210 | #endif | |
336b517f | 1211 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 PM |
1212 | "ip6table_%s", name); |
1213 | if (t && !IS_ERR(t)) { | |
1214 | struct ip6t_getinfo info; | |
5452e425 | 1215 | const struct xt_table_info *private = t->private; |
433665c9 | 1216 | |
3bc3fe5e PM |
1217 | #ifdef CONFIG_COMPAT |
1218 | if (compat) { | |
1219 | struct xt_table_info tmp; | |
1220 | ret = compat_table_info(private, &tmp); | |
1221 | xt_compat_flush_offsets(AF_INET6); | |
1222 | private = &tmp; | |
1223 | } | |
1224 | #endif | |
433665c9 PM |
1225 | info.valid_hooks = t->valid_hooks; |
1226 | memcpy(info.hook_entry, private->hook_entry, | |
1227 | sizeof(info.hook_entry)); | |
1228 | memcpy(info.underflow, private->underflow, | |
1229 | sizeof(info.underflow)); | |
1230 | info.num_entries = private->number; | |
1231 | info.size = private->size; | |
b5dd674b | 1232 | strcpy(info.name, name); |
433665c9 PM |
1233 | |
1234 | if (copy_to_user(user, &info, *len) != 0) | |
1235 | ret = -EFAULT; | |
1236 | else | |
1237 | ret = 0; | |
1238 | ||
1239 | xt_table_unlock(t); | |
1240 | module_put(t->me); | |
1241 | } else | |
1242 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1243 | #ifdef CONFIG_COMPAT |
1244 | if (compat) | |
1245 | xt_compat_unlock(AF_INET6); | |
1246 | #endif | |
433665c9 PM |
1247 | return ret; |
1248 | } | |
1249 | ||
1da177e4 | 1250 | static int |
336b517f | 1251 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, int *len) |
1da177e4 LT |
1252 | { |
1253 | int ret; | |
d924357c | 1254 | struct ip6t_get_entries get; |
2e4e6a17 | 1255 | struct xt_table *t; |
1da177e4 | 1256 | |
d924357c | 1257 | if (*len < sizeof(get)) { |
c9d8fe13 | 1258 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1259 | return -EINVAL; |
1260 | } | |
1261 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1262 | return -EFAULT; | |
1263 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1264 | duprintf("get_entries: %u != %zu\n", |
1265 | *len, sizeof(get) + get.size); | |
d924357c PM |
1266 | return -EINVAL; |
1267 | } | |
1268 | ||
336b517f | 1269 | t = xt_find_table_lock(net, AF_INET6, get.name); |
6b7d31fc | 1270 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
1271 | struct xt_table_info *private = t->private; |
1272 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1273 | if (get.size == private->size) |
2e4e6a17 | 1274 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1275 | t, uptr->entrytable); |
1276 | else { | |
1277 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1278 | private->size, get.size); |
544473c1 | 1279 | ret = -EAGAIN; |
1da177e4 | 1280 | } |
6b7d31fc | 1281 | module_put(t->me); |
2e4e6a17 | 1282 | xt_table_unlock(t); |
1da177e4 | 1283 | } else |
6b7d31fc | 1284 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1285 | |
1286 | return ret; | |
1287 | } | |
1288 | ||
1289 | static int | |
336b517f | 1290 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1291 | struct xt_table_info *newinfo, unsigned int num_counters, |
1292 | void __user *counters_ptr) | |
1da177e4 LT |
1293 | { |
1294 | int ret; | |
2e4e6a17 | 1295 | struct xt_table *t; |
3bc3fe5e | 1296 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1297 | struct xt_counters *counters; |
5452e425 | 1298 | const void *loc_cpu_old_entry; |
1da177e4 | 1299 | |
3bc3fe5e PM |
1300 | ret = 0; |
1301 | counters = vmalloc_node(num_counters * sizeof(struct xt_counters), | |
3b84e92b | 1302 | numa_node_id()); |
1da177e4 LT |
1303 | if (!counters) { |
1304 | ret = -ENOMEM; | |
3bc3fe5e | 1305 | goto out; |
1da177e4 | 1306 | } |
1da177e4 | 1307 | |
336b517f | 1308 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1309 | "ip6table_%s", name); |
6b7d31fc HW |
1310 | if (!t || IS_ERR(t)) { |
1311 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1312 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1313 | } |
1da177e4 LT |
1314 | |
1315 | /* You lied! */ | |
3bc3fe5e | 1316 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1317 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1318 | valid_hooks, t->valid_hooks); |
1da177e4 | 1319 | ret = -EINVAL; |
6b7d31fc | 1320 | goto put_module; |
1da177e4 LT |
1321 | } |
1322 | ||
3bc3fe5e | 1323 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1324 | if (!oldinfo) |
1325 | goto put_module; | |
1326 | ||
1327 | /* Update module usage count based on number of rules */ | |
1328 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1329 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1330 | if ((oldinfo->number > oldinfo->initial_entries) || |
1331 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1332 | module_put(t->me); |
1333 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1334 | (newinfo->number <= oldinfo->initial_entries)) | |
1335 | module_put(t->me); | |
1336 | ||
1337 | /* Get the old counters. */ | |
1338 | get_counters(oldinfo, counters); | |
1339 | /* Decrease module usage counts and free resource */ | |
31836064 | 1340 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
3bc3fe5e PM |
1341 | IP6T_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry, |
1342 | NULL); | |
2e4e6a17 | 1343 | xt_free_table_info(oldinfo); |
3bc3fe5e PM |
1344 | if (copy_to_user(counters_ptr, counters, |
1345 | sizeof(struct xt_counters) * num_counters) != 0) | |
1da177e4 LT |
1346 | ret = -EFAULT; |
1347 | vfree(counters); | |
2e4e6a17 | 1348 | xt_table_unlock(t); |
1da177e4 LT |
1349 | return ret; |
1350 | ||
1351 | put_module: | |
1352 | module_put(t->me); | |
2e4e6a17 | 1353 | xt_table_unlock(t); |
1da177e4 | 1354 | free_newinfo_counters_untrans: |
1da177e4 | 1355 | vfree(counters); |
3bc3fe5e PM |
1356 | out: |
1357 | return ret; | |
1358 | } | |
1359 | ||
1360 | static int | |
336b517f | 1361 | do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1362 | { |
1363 | int ret; | |
1364 | struct ip6t_replace tmp; | |
1365 | struct xt_table_info *newinfo; | |
1366 | void *loc_cpu_entry; | |
1367 | ||
1368 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1369 | return -EFAULT; | |
1370 | ||
1371 | /* overflow check */ | |
1372 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1373 | return -ENOMEM; | |
1374 | ||
1375 | newinfo = xt_alloc_table_info(tmp.size); | |
1376 | if (!newinfo) | |
1377 | return -ENOMEM; | |
1378 | ||
1379 | /* choose the copy that is on our node/cpu */ | |
1380 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1381 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1382 | tmp.size) != 0) { | |
1383 | ret = -EFAULT; | |
1384 | goto free_newinfo; | |
1385 | } | |
1386 | ||
1387 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
1388 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, | |
1389 | tmp.hook_entry, tmp.underflow); | |
1390 | if (ret != 0) | |
1391 | goto free_newinfo; | |
1392 | ||
1393 | duprintf("ip_tables: Translated table\n"); | |
1394 | ||
336b517f | 1395 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1396 | tmp.num_counters, tmp.counters); |
1397 | if (ret) | |
1398 | goto free_newinfo_untrans; | |
1399 | return 0; | |
1400 | ||
1401 | free_newinfo_untrans: | |
1402 | IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); | |
1da177e4 | 1403 | free_newinfo: |
2e4e6a17 | 1404 | xt_free_table_info(newinfo); |
1da177e4 LT |
1405 | return ret; |
1406 | } | |
1407 | ||
1da177e4 | 1408 | static int |
336b517f AD |
1409 | do_add_counters(struct net *net, void __user *user, unsigned int len, |
1410 | int compat) | |
1da177e4 LT |
1411 | { |
1412 | unsigned int i; | |
3bc3fe5e PM |
1413 | struct xt_counters_info tmp; |
1414 | struct xt_counters *paddc; | |
1415 | unsigned int num_counters; | |
1416 | char *name; | |
1417 | int size; | |
1418 | void *ptmp; | |
2e4e6a17 | 1419 | struct xt_table *t; |
5452e425 | 1420 | const struct xt_table_info *private; |
6b7d31fc | 1421 | int ret = 0; |
5452e425 | 1422 | const void *loc_cpu_entry; |
3bc3fe5e PM |
1423 | #ifdef CONFIG_COMPAT |
1424 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1425 | |
3bc3fe5e PM |
1426 | if (compat) { |
1427 | ptmp = &compat_tmp; | |
1428 | size = sizeof(struct compat_xt_counters_info); | |
1429 | } else | |
1430 | #endif | |
1431 | { | |
1432 | ptmp = &tmp; | |
1433 | size = sizeof(struct xt_counters_info); | |
1434 | } | |
1435 | ||
1436 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1437 | return -EFAULT; |
1438 | ||
3bc3fe5e PM |
1439 | #ifdef CONFIG_COMPAT |
1440 | if (compat) { | |
1441 | num_counters = compat_tmp.num_counters; | |
1442 | name = compat_tmp.name; | |
1443 | } else | |
1444 | #endif | |
1445 | { | |
1446 | num_counters = tmp.num_counters; | |
1447 | name = tmp.name; | |
1448 | } | |
1449 | ||
1450 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1451 | return -EINVAL; |
1452 | ||
3bc3fe5e | 1453 | paddc = vmalloc_node(len - size, numa_node_id()); |
1da177e4 LT |
1454 | if (!paddc) |
1455 | return -ENOMEM; | |
1456 | ||
3bc3fe5e | 1457 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1458 | ret = -EFAULT; |
1459 | goto free; | |
1460 | } | |
1461 | ||
336b517f | 1462 | t = xt_find_table_lock(net, AF_INET6, name); |
6b7d31fc HW |
1463 | if (!t || IS_ERR(t)) { |
1464 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1465 | goto free; |
6b7d31fc | 1466 | } |
1da177e4 | 1467 | |
78454473 | 1468 | mutex_lock(&t->lock); |
2e4e6a17 | 1469 | private = t->private; |
3bc3fe5e | 1470 | if (private->number != num_counters) { |
1da177e4 LT |
1471 | ret = -EINVAL; |
1472 | goto unlock_up_free; | |
1473 | } | |
1474 | ||
78454473 | 1475 | preempt_disable(); |
1da177e4 | 1476 | i = 0; |
31836064 | 1477 | /* Choose the copy that is on our node */ |
da4d0f6b | 1478 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 1479 | IP6T_ENTRY_ITERATE(loc_cpu_entry, |
2e4e6a17 | 1480 | private->size, |
1da177e4 | 1481 | add_counter_to_entry, |
3bc3fe5e | 1482 | paddc, |
1da177e4 | 1483 | &i); |
78454473 | 1484 | preempt_enable(); |
1da177e4 | 1485 | unlock_up_free: |
78454473 | 1486 | mutex_unlock(&t->lock); |
2e4e6a17 | 1487 | xt_table_unlock(t); |
6b7d31fc | 1488 | module_put(t->me); |
1da177e4 LT |
1489 | free: |
1490 | vfree(paddc); | |
1491 | ||
1492 | return ret; | |
1493 | } | |
1494 | ||
3bc3fe5e PM |
1495 | #ifdef CONFIG_COMPAT |
1496 | struct compat_ip6t_replace { | |
1497 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1498 | u32 valid_hooks; | |
1499 | u32 num_entries; | |
1500 | u32 size; | |
1501 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1502 | u32 underflow[NF_INET_NUMHOOKS]; | |
1503 | u32 num_counters; | |
1504 | compat_uptr_t counters; /* struct ip6t_counters * */ | |
1505 | struct compat_ip6t_entry entries[0]; | |
1506 | }; | |
1507 | ||
1508 | static int | |
1509 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1510 | unsigned int *size, struct xt_counters *counters, |
3bc3fe5e PM |
1511 | unsigned int *i) |
1512 | { | |
1513 | struct ip6t_entry_target *t; | |
1514 | struct compat_ip6t_entry __user *ce; | |
1515 | u_int16_t target_offset, next_offset; | |
1516 | compat_uint_t origsize; | |
1517 | int ret; | |
1518 | ||
1519 | ret = -EFAULT; | |
1520 | origsize = *size; | |
1521 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
1522 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry))) | |
1523 | goto out; | |
1524 | ||
1525 | if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i]))) | |
1526 | goto out; | |
1527 | ||
1528 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1529 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1530 | ||
1531 | ret = IP6T_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size); | |
1532 | target_offset = e->target_offset - (origsize - *size); | |
1533 | if (ret) | |
1534 | goto out; | |
1535 | t = ip6t_get_target(e); | |
1536 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1537 | if (ret) | |
1538 | goto out; | |
1539 | ret = -EFAULT; | |
1540 | next_offset = e->next_offset - (origsize - *size); | |
1541 | if (put_user(target_offset, &ce->target_offset)) | |
1542 | goto out; | |
1543 | if (put_user(next_offset, &ce->next_offset)) | |
1544 | goto out; | |
1545 | ||
1546 | (*i)++; | |
1547 | return 0; | |
1548 | out: | |
1549 | return ret; | |
1550 | } | |
1551 | ||
022748a9 | 1552 | static int |
3bc3fe5e PM |
1553 | compat_find_calc_match(struct ip6t_entry_match *m, |
1554 | const char *name, | |
1555 | const struct ip6t_ip6 *ipv6, | |
1556 | unsigned int hookmask, | |
b0a6363c | 1557 | int *size, unsigned int *i) |
3bc3fe5e PM |
1558 | { |
1559 | struct xt_match *match; | |
1560 | ||
1561 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, | |
1562 | m->u.user.revision), | |
1563 | "ip6t_%s", m->u.user.name); | |
1564 | if (IS_ERR(match) || !match) { | |
1565 | duprintf("compat_check_calc_match: `%s' not found\n", | |
1566 | m->u.user.name); | |
1567 | return match ? PTR_ERR(match) : -ENOENT; | |
1568 | } | |
1569 | m->u.kernel.match = match; | |
1570 | *size += xt_compat_match_offset(match); | |
1571 | ||
1572 | (*i)++; | |
1573 | return 0; | |
1574 | } | |
1575 | ||
022748a9 | 1576 | static int |
3bc3fe5e PM |
1577 | compat_release_match(struct ip6t_entry_match *m, unsigned int *i) |
1578 | { | |
1579 | if (i && (*i)-- == 0) | |
1580 | return 1; | |
1581 | ||
1582 | module_put(m->u.kernel.match->me); | |
1583 | return 0; | |
1584 | } | |
1585 | ||
022748a9 | 1586 | static int |
3bc3fe5e PM |
1587 | compat_release_entry(struct compat_ip6t_entry *e, unsigned int *i) |
1588 | { | |
1589 | struct ip6t_entry_target *t; | |
1590 | ||
1591 | if (i && (*i)-- == 0) | |
1592 | return 1; | |
1593 | ||
1594 | /* Cleanup all matches */ | |
1595 | COMPAT_IP6T_MATCH_ITERATE(e, compat_release_match, NULL); | |
1596 | t = compat_ip6t_get_target(e); | |
1597 | module_put(t->u.kernel.target->me); | |
1598 | return 0; | |
1599 | } | |
1600 | ||
022748a9 | 1601 | static int |
3bc3fe5e PM |
1602 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1603 | struct xt_table_info *newinfo, | |
1604 | unsigned int *size, | |
1605 | unsigned char *base, | |
1606 | unsigned char *limit, | |
1607 | unsigned int *hook_entries, | |
1608 | unsigned int *underflows, | |
1609 | unsigned int *i, | |
1610 | const char *name) | |
1611 | { | |
1612 | struct ip6t_entry_target *t; | |
1613 | struct xt_target *target; | |
1614 | unsigned int entry_offset; | |
b0a6363c PM |
1615 | unsigned int j; |
1616 | int ret, off, h; | |
3bc3fe5e PM |
1617 | |
1618 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
1619 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 | |
1620 | || (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
1621 | duprintf("Bad offset %p, limit = %p\n", e, limit); | |
1622 | return -EINVAL; | |
1623 | } | |
1624 | ||
1625 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1626 | sizeof(struct compat_xt_entry_target)) { | |
1627 | duprintf("checking: element %p size %u\n", | |
1628 | e, e->next_offset); | |
1629 | return -EINVAL; | |
1630 | } | |
1631 | ||
1632 | /* For purposes of check_entry casting the compat entry is fine */ | |
1633 | ret = check_entry((struct ip6t_entry *)e, name); | |
1634 | if (ret) | |
1635 | return ret; | |
1636 | ||
1637 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1638 | entry_offset = (void *)e - (void *)base; | |
1639 | j = 0; | |
1640 | ret = COMPAT_IP6T_MATCH_ITERATE(e, compat_find_calc_match, name, | |
1641 | &e->ipv6, e->comefrom, &off, &j); | |
1642 | if (ret != 0) | |
1643 | goto release_matches; | |
1644 | ||
1645 | t = compat_ip6t_get_target(e); | |
1646 | target = try_then_request_module(xt_find_target(AF_INET6, | |
1647 | t->u.user.name, | |
1648 | t->u.user.revision), | |
1649 | "ip6t_%s", t->u.user.name); | |
1650 | if (IS_ERR(target) || !target) { | |
1651 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", | |
1652 | t->u.user.name); | |
1653 | ret = target ? PTR_ERR(target) : -ENOENT; | |
1654 | goto release_matches; | |
1655 | } | |
1656 | t->u.kernel.target = target; | |
1657 | ||
1658 | off += xt_compat_target_offset(target); | |
1659 | *size += off; | |
1660 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1661 | if (ret) | |
1662 | goto out; | |
1663 | ||
1664 | /* Check hooks & underflows */ | |
1665 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1666 | if ((unsigned char *)e - base == hook_entries[h]) | |
1667 | newinfo->hook_entry[h] = hook_entries[h]; | |
1668 | if ((unsigned char *)e - base == underflows[h]) | |
1669 | newinfo->underflow[h] = underflows[h]; | |
1670 | } | |
1671 | ||
1672 | /* Clear counters and comefrom */ | |
1673 | memset(&e->counters, 0, sizeof(e->counters)); | |
1674 | e->comefrom = 0; | |
1675 | ||
1676 | (*i)++; | |
1677 | return 0; | |
1678 | ||
1679 | out: | |
1680 | module_put(t->u.kernel.target->me); | |
1681 | release_matches: | |
1682 | IP6T_MATCH_ITERATE(e, compat_release_match, &j); | |
1683 | return ret; | |
1684 | } | |
1685 | ||
1686 | static int | |
1687 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1688 | unsigned int *size, const char *name, | |
1689 | struct xt_table_info *newinfo, unsigned char *base) | |
1690 | { | |
1691 | struct ip6t_entry_target *t; | |
1692 | struct xt_target *target; | |
1693 | struct ip6t_entry *de; | |
1694 | unsigned int origsize; | |
1695 | int ret, h; | |
1696 | ||
1697 | ret = 0; | |
1698 | origsize = *size; | |
1699 | de = (struct ip6t_entry *)*dstptr; | |
1700 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1701 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1702 | ||
1703 | *dstptr += sizeof(struct ip6t_entry); | |
1704 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1705 | ||
1706 | ret = COMPAT_IP6T_MATCH_ITERATE(e, xt_compat_match_from_user, | |
1707 | dstptr, size); | |
1708 | if (ret) | |
1709 | return ret; | |
1710 | de->target_offset = e->target_offset - (origsize - *size); | |
1711 | t = compat_ip6t_get_target(e); | |
1712 | target = t->u.kernel.target; | |
1713 | xt_compat_target_from_user(t, dstptr, size); | |
1714 | ||
1715 | de->next_offset = e->next_offset - (origsize - *size); | |
1716 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1717 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1718 | newinfo->hook_entry[h] -= origsize - *size; | |
1719 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1720 | newinfo->underflow[h] -= origsize - *size; | |
1721 | } | |
1722 | return ret; | |
1723 | } | |
1724 | ||
022748a9 | 1725 | static int compat_check_entry(struct ip6t_entry *e, const char *name, |
3bc3fe5e PM |
1726 | unsigned int *i) |
1727 | { | |
b0a6363c PM |
1728 | unsigned int j; |
1729 | int ret; | |
9b4fce7a | 1730 | struct xt_mtchk_param mtpar; |
3bc3fe5e PM |
1731 | |
1732 | j = 0; | |
9b4fce7a JE |
1733 | mtpar.table = name; |
1734 | mtpar.entryinfo = &e->ipv6; | |
1735 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1736 | mtpar.family = NFPROTO_IPV6; |
9b4fce7a | 1737 | ret = IP6T_MATCH_ITERATE(e, check_match, &mtpar, &j); |
3bc3fe5e PM |
1738 | if (ret) |
1739 | goto cleanup_matches; | |
1740 | ||
1741 | ret = check_target(e, name); | |
1742 | if (ret) | |
1743 | goto cleanup_matches; | |
1744 | ||
1745 | (*i)++; | |
1746 | return 0; | |
1747 | ||
1748 | cleanup_matches: | |
1749 | IP6T_MATCH_ITERATE(e, cleanup_match, &j); | |
1750 | return ret; | |
1751 | } | |
1752 | ||
1753 | static int | |
1754 | translate_compat_table(const char *name, | |
1755 | unsigned int valid_hooks, | |
1756 | struct xt_table_info **pinfo, | |
1757 | void **pentry0, | |
1758 | unsigned int total_size, | |
1759 | unsigned int number, | |
1760 | unsigned int *hook_entries, | |
1761 | unsigned int *underflows) | |
1762 | { | |
1763 | unsigned int i, j; | |
1764 | struct xt_table_info *newinfo, *info; | |
1765 | void *pos, *entry0, *entry1; | |
1766 | unsigned int size; | |
1767 | int ret; | |
1768 | ||
1769 | info = *pinfo; | |
1770 | entry0 = *pentry0; | |
1771 | size = total_size; | |
1772 | info->number = number; | |
1773 | ||
1774 | /* Init all hooks to impossible value. */ | |
1775 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1776 | info->hook_entry[i] = 0xFFFFFFFF; | |
1777 | info->underflow[i] = 0xFFFFFFFF; | |
1778 | } | |
1779 | ||
1780 | duprintf("translate_compat_table: size %u\n", info->size); | |
1781 | j = 0; | |
1782 | xt_compat_lock(AF_INET6); | |
1783 | /* Walk through entries, checking offsets. */ | |
1784 | ret = COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size, | |
1785 | check_compat_entry_size_and_hooks, | |
1786 | info, &size, entry0, | |
1787 | entry0 + total_size, | |
1788 | hook_entries, underflows, &j, name); | |
1789 | if (ret != 0) | |
1790 | goto out_unlock; | |
1791 | ||
1792 | ret = -EINVAL; | |
1793 | if (j != number) { | |
1794 | duprintf("translate_compat_table: %u not %u entries\n", | |
1795 | j, number); | |
1796 | goto out_unlock; | |
1797 | } | |
1798 | ||
1799 | /* Check hooks all assigned */ | |
1800 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1801 | /* Only hooks which are valid */ | |
1802 | if (!(valid_hooks & (1 << i))) | |
1803 | continue; | |
1804 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1805 | duprintf("Invalid hook entry %u %u\n", | |
1806 | i, hook_entries[i]); | |
1807 | goto out_unlock; | |
1808 | } | |
1809 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1810 | duprintf("Invalid underflow %u %u\n", | |
1811 | i, underflows[i]); | |
1812 | goto out_unlock; | |
1813 | } | |
1814 | } | |
1815 | ||
1816 | ret = -ENOMEM; | |
1817 | newinfo = xt_alloc_table_info(size); | |
1818 | if (!newinfo) | |
1819 | goto out_unlock; | |
1820 | ||
1821 | newinfo->number = number; | |
1822 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1823 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1824 | newinfo->underflow[i] = info->underflow[i]; | |
1825 | } | |
1826 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1827 | pos = entry1; | |
1828 | size = total_size; | |
1829 | ret = COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size, | |
1830 | compat_copy_entry_from_user, | |
1831 | &pos, &size, name, newinfo, entry1); | |
1832 | xt_compat_flush_offsets(AF_INET6); | |
1833 | xt_compat_unlock(AF_INET6); | |
1834 | if (ret) | |
1835 | goto free_newinfo; | |
1836 | ||
1837 | ret = -ELOOP; | |
1838 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1839 | goto free_newinfo; | |
1840 | ||
1841 | i = 0; | |
1842 | ret = IP6T_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry, | |
1843 | name, &i); | |
1844 | if (ret) { | |
1845 | j -= i; | |
1846 | COMPAT_IP6T_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i, | |
1847 | compat_release_entry, &j); | |
1848 | IP6T_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i); | |
1849 | xt_free_table_info(newinfo); | |
1850 | return ret; | |
1851 | } | |
1852 | ||
1853 | /* And one copy for every other CPU */ | |
1854 | for_each_possible_cpu(i) | |
1855 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1856 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1857 | ||
1858 | *pinfo = newinfo; | |
1859 | *pentry0 = entry1; | |
1860 | xt_free_table_info(info); | |
1861 | return 0; | |
1862 | ||
1863 | free_newinfo: | |
1864 | xt_free_table_info(newinfo); | |
1865 | out: | |
1866 | COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j); | |
1867 | return ret; | |
1868 | out_unlock: | |
1869 | xt_compat_flush_offsets(AF_INET6); | |
1870 | xt_compat_unlock(AF_INET6); | |
1871 | goto out; | |
1872 | } | |
1873 | ||
1874 | static int | |
336b517f | 1875 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1876 | { |
1877 | int ret; | |
1878 | struct compat_ip6t_replace tmp; | |
1879 | struct xt_table_info *newinfo; | |
1880 | void *loc_cpu_entry; | |
1881 | ||
1882 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1883 | return -EFAULT; | |
1884 | ||
1885 | /* overflow check */ | |
1886 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1887 | return -ENOMEM; | |
1888 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1889 | return -ENOMEM; | |
1890 | ||
1891 | newinfo = xt_alloc_table_info(tmp.size); | |
1892 | if (!newinfo) | |
1893 | return -ENOMEM; | |
1894 | ||
9c547959 | 1895 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1896 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1897 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1898 | tmp.size) != 0) { | |
1899 | ret = -EFAULT; | |
1900 | goto free_newinfo; | |
1901 | } | |
1902 | ||
1903 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, | |
1904 | &newinfo, &loc_cpu_entry, tmp.size, | |
1905 | tmp.num_entries, tmp.hook_entry, | |
1906 | tmp.underflow); | |
1907 | if (ret != 0) | |
1908 | goto free_newinfo; | |
1909 | ||
1910 | duprintf("compat_do_replace: Translated table\n"); | |
1911 | ||
336b517f | 1912 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1913 | tmp.num_counters, compat_ptr(tmp.counters)); |
1914 | if (ret) | |
1915 | goto free_newinfo_untrans; | |
1916 | return 0; | |
1917 | ||
1918 | free_newinfo_untrans: | |
1919 | IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); | |
1920 | free_newinfo: | |
1921 | xt_free_table_info(newinfo); | |
1922 | return ret; | |
1923 | } | |
1924 | ||
1925 | static int | |
1926 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1927 | unsigned int len) | |
1928 | { | |
1929 | int ret; | |
1930 | ||
1931 | if (!capable(CAP_NET_ADMIN)) | |
1932 | return -EPERM; | |
1933 | ||
1934 | switch (cmd) { | |
1935 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1936 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1937 | break; |
1938 | ||
1939 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1940 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1941 | break; |
1942 | ||
1943 | default: | |
1944 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1945 | ret = -EINVAL; | |
1946 | } | |
1947 | ||
1948 | return ret; | |
1949 | } | |
1950 | ||
1951 | struct compat_ip6t_get_entries { | |
1952 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1953 | compat_uint_t size; | |
1954 | struct compat_ip6t_entry entrytable[0]; | |
1955 | }; | |
1956 | ||
1957 | static int | |
1958 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1959 | void __user *userptr) | |
1960 | { | |
1961 | struct xt_counters *counters; | |
5452e425 | 1962 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1963 | void __user *pos; |
1964 | unsigned int size; | |
1965 | int ret = 0; | |
5452e425 | 1966 | const void *loc_cpu_entry; |
3bc3fe5e PM |
1967 | unsigned int i = 0; |
1968 | ||
1969 | counters = alloc_counters(table); | |
1970 | if (IS_ERR(counters)) | |
1971 | return PTR_ERR(counters); | |
1972 | ||
1973 | /* choose the copy that is on our node/cpu, ... | |
1974 | * This choice is lazy (because current thread is | |
1975 | * allowed to migrate to another cpu) | |
1976 | */ | |
1977 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1978 | pos = userptr; | |
1979 | size = total_size; | |
1980 | ret = IP6T_ENTRY_ITERATE(loc_cpu_entry, total_size, | |
1981 | compat_copy_entry_to_user, | |
1982 | &pos, &size, counters, &i); | |
1983 | ||
1984 | vfree(counters); | |
1985 | return ret; | |
1986 | } | |
1987 | ||
1988 | static int | |
336b517f AD |
1989 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1990 | int *len) | |
3bc3fe5e PM |
1991 | { |
1992 | int ret; | |
1993 | struct compat_ip6t_get_entries get; | |
1994 | struct xt_table *t; | |
1995 | ||
1996 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1997 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1998 | return -EINVAL; |
1999 | } | |
2000 | ||
2001 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
2002 | return -EFAULT; | |
2003 | ||
2004 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
2005 | duprintf("compat_get_entries: %u != %zu\n", |
2006 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
2007 | return -EINVAL; |
2008 | } | |
2009 | ||
2010 | xt_compat_lock(AF_INET6); | |
336b517f | 2011 | t = xt_find_table_lock(net, AF_INET6, get.name); |
3bc3fe5e | 2012 | if (t && !IS_ERR(t)) { |
5452e425 | 2013 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 2014 | struct xt_table_info info; |
9c547959 | 2015 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
2016 | ret = compat_table_info(private, &info); |
2017 | if (!ret && get.size == info.size) { | |
2018 | ret = compat_copy_entries_to_user(private->size, | |
2019 | t, uptr->entrytable); | |
2020 | } else if (!ret) { | |
2021 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 2022 | private->size, get.size); |
544473c1 | 2023 | ret = -EAGAIN; |
3bc3fe5e PM |
2024 | } |
2025 | xt_compat_flush_offsets(AF_INET6); | |
2026 | module_put(t->me); | |
2027 | xt_table_unlock(t); | |
2028 | } else | |
2029 | ret = t ? PTR_ERR(t) : -ENOENT; | |
2030 | ||
2031 | xt_compat_unlock(AF_INET6); | |
2032 | return ret; | |
2033 | } | |
2034 | ||
2035 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
2036 | ||
2037 | static int | |
2038 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2039 | { | |
2040 | int ret; | |
2041 | ||
2042 | if (!capable(CAP_NET_ADMIN)) | |
2043 | return -EPERM; | |
2044 | ||
2045 | switch (cmd) { | |
2046 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 2047 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
2048 | break; |
2049 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 2050 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
2051 | break; |
2052 | default: | |
2053 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
2054 | } | |
2055 | return ret; | |
2056 | } | |
2057 | #endif | |
2058 | ||
1da177e4 LT |
2059 | static int |
2060 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2061 | { | |
2062 | int ret; | |
2063 | ||
2064 | if (!capable(CAP_NET_ADMIN)) | |
2065 | return -EPERM; | |
2066 | ||
2067 | switch (cmd) { | |
2068 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2069 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2070 | break; |
2071 | ||
2072 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2073 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2074 | break; |
2075 | ||
2076 | default: | |
2077 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2078 | ret = -EINVAL; | |
2079 | } | |
2080 | ||
2081 | return ret; | |
2082 | } | |
2083 | ||
2084 | static int | |
2085 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2086 | { | |
2087 | int ret; | |
2088 | ||
2089 | if (!capable(CAP_NET_ADMIN)) | |
2090 | return -EPERM; | |
2091 | ||
2092 | switch (cmd) { | |
433665c9 | 2093 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2094 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2095 | break; |
1da177e4 | 2096 | |
d924357c | 2097 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2098 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2099 | break; |
1da177e4 | 2100 | |
6b7d31fc HW |
2101 | case IP6T_SO_GET_REVISION_MATCH: |
2102 | case IP6T_SO_GET_REVISION_TARGET: { | |
2103 | struct ip6t_get_revision rev; | |
2e4e6a17 | 2104 | int target; |
6b7d31fc HW |
2105 | |
2106 | if (*len != sizeof(rev)) { | |
2107 | ret = -EINVAL; | |
2108 | break; | |
2109 | } | |
2110 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2111 | ret = -EFAULT; | |
2112 | break; | |
2113 | } | |
2114 | ||
2115 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2116 | target = 1; |
6b7d31fc | 2117 | else |
2e4e6a17 | 2118 | target = 0; |
6b7d31fc | 2119 | |
2e4e6a17 HW |
2120 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2121 | rev.revision, | |
2122 | target, &ret), | |
6b7d31fc HW |
2123 | "ip6t_%s", rev.name); |
2124 | break; | |
2125 | } | |
2126 | ||
1da177e4 LT |
2127 | default: |
2128 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2129 | ret = -EINVAL; | |
2130 | } | |
2131 | ||
2132 | return ret; | |
2133 | } | |
2134 | ||
336b517f AD |
2135 | struct xt_table *ip6t_register_table(struct net *net, struct xt_table *table, |
2136 | const struct ip6t_replace *repl) | |
1da177e4 LT |
2137 | { |
2138 | int ret; | |
2e4e6a17 | 2139 | struct xt_table_info *newinfo; |
259d4e41 | 2140 | struct xt_table_info bootstrap |
1da177e4 | 2141 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2142 | void *loc_cpu_entry; |
a98da11d | 2143 | struct xt_table *new_table; |
1da177e4 | 2144 | |
2e4e6a17 | 2145 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2146 | if (!newinfo) { |
2147 | ret = -ENOMEM; | |
2148 | goto out; | |
2149 | } | |
1da177e4 | 2150 | |
9c547959 | 2151 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2152 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2153 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
2154 | |
2155 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 2156 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
2157 | repl->num_entries, |
2158 | repl->hook_entry, | |
2159 | repl->underflow); | |
44d34e72 AD |
2160 | if (ret != 0) |
2161 | goto out_free; | |
1da177e4 | 2162 | |
336b517f | 2163 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2164 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2165 | ret = PTR_ERR(new_table); |
2166 | goto out_free; | |
1da177e4 | 2167 | } |
44d34e72 | 2168 | return new_table; |
1da177e4 | 2169 | |
44d34e72 AD |
2170 | out_free: |
2171 | xt_free_table_info(newinfo); | |
2172 | out: | |
2173 | return ERR_PTR(ret); | |
1da177e4 LT |
2174 | } |
2175 | ||
2e4e6a17 | 2176 | void ip6t_unregister_table(struct xt_table *table) |
1da177e4 | 2177 | { |
2e4e6a17 | 2178 | struct xt_table_info *private; |
31836064 | 2179 | void *loc_cpu_entry; |
df200969 | 2180 | struct module *table_owner = table->me; |
31836064 | 2181 | |
2e4e6a17 | 2182 | private = xt_unregister_table(table); |
1da177e4 LT |
2183 | |
2184 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
2185 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
2186 | IP6T_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
df200969 AD |
2187 | if (private->number > private->initial_entries) |
2188 | module_put(table_owner); | |
2e4e6a17 | 2189 | xt_free_table_info(private); |
1da177e4 LT |
2190 | } |
2191 | ||
2192 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2193 | static inline bool |
1da177e4 LT |
2194 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2195 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2196 | bool invert) |
1da177e4 LT |
2197 | { |
2198 | return (type == test_type && code >= min_code && code <= max_code) | |
2199 | ^ invert; | |
2200 | } | |
2201 | ||
1d93a9cb | 2202 | static bool |
f7108a20 | 2203 | icmp6_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2204 | { |
5452e425 JE |
2205 | const struct icmp6hdr *ic; |
2206 | struct icmp6hdr _icmph; | |
f7108a20 | 2207 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2208 | |
2209 | /* Must not be a fragment. */ | |
f7108a20 | 2210 | if (par->fragoff != 0) |
1d93a9cb | 2211 | return false; |
1da177e4 | 2212 | |
f7108a20 | 2213 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2214 | if (ic == NULL) { |
2215 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2216 | * can't. Hence, no choice but to drop. |
2217 | */ | |
1da177e4 | 2218 | duprintf("Dropping evil ICMP tinygram.\n"); |
f7108a20 | 2219 | *par->hotdrop = true; |
1d93a9cb | 2220 | return false; |
1da177e4 LT |
2221 | } |
2222 | ||
2223 | return icmp6_type_code_match(icmpinfo->type, | |
2224 | icmpinfo->code[0], | |
2225 | icmpinfo->code[1], | |
2226 | ic->icmp6_type, ic->icmp6_code, | |
2227 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2228 | } | |
2229 | ||
2230 | /* Called when user tries to insert an entry of this type. */ | |
9b4fce7a | 2231 | static bool icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2232 | { |
9b4fce7a | 2233 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2234 | |
7f939713 PM |
2235 | /* Must specify no unknown invflags */ |
2236 | return !(icmpinfo->invflags & ~IP6T_ICMP_INV); | |
1da177e4 LT |
2237 | } |
2238 | ||
2239 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2240 | static struct xt_target ip6t_standard_target __read_mostly = { |
1da177e4 | 2241 | .name = IP6T_STANDARD_TARGET, |
7f939713 | 2242 | .targetsize = sizeof(int), |
a45049c5 | 2243 | .family = AF_INET6, |
3bc3fe5e PM |
2244 | #ifdef CONFIG_COMPAT |
2245 | .compatsize = sizeof(compat_int_t), | |
2246 | .compat_from_user = compat_standard_from_user, | |
2247 | .compat_to_user = compat_standard_to_user, | |
2248 | #endif | |
1da177e4 LT |
2249 | }; |
2250 | ||
9f15c530 | 2251 | static struct xt_target ip6t_error_target __read_mostly = { |
1da177e4 LT |
2252 | .name = IP6T_ERROR_TARGET, |
2253 | .target = ip6t_error, | |
7f939713 | 2254 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, |
a45049c5 | 2255 | .family = AF_INET6, |
1da177e4 LT |
2256 | }; |
2257 | ||
2258 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2259 | .pf = PF_INET6, | |
2260 | .set_optmin = IP6T_BASE_CTL, | |
2261 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2262 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2263 | #ifdef CONFIG_COMPAT |
2264 | .compat_set = compat_do_ip6t_set_ctl, | |
2265 | #endif | |
1da177e4 LT |
2266 | .get_optmin = IP6T_BASE_CTL, |
2267 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2268 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2269 | #ifdef CONFIG_COMPAT |
2270 | .compat_get = compat_do_ip6t_get_ctl, | |
2271 | #endif | |
16fcec35 | 2272 | .owner = THIS_MODULE, |
1da177e4 LT |
2273 | }; |
2274 | ||
9f15c530 | 2275 | static struct xt_match icmp6_matchstruct __read_mostly = { |
1da177e4 | 2276 | .name = "icmp6", |
9c547959 | 2277 | .match = icmp6_match, |
7f939713 PM |
2278 | .matchsize = sizeof(struct ip6t_icmp), |
2279 | .checkentry = icmp6_checkentry, | |
2280 | .proto = IPPROTO_ICMPV6, | |
a45049c5 | 2281 | .family = AF_INET6, |
1da177e4 LT |
2282 | }; |
2283 | ||
3cb609d5 AD |
2284 | static int __net_init ip6_tables_net_init(struct net *net) |
2285 | { | |
2286 | return xt_proto_init(net, AF_INET6); | |
2287 | } | |
2288 | ||
2289 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2290 | { | |
2291 | xt_proto_fini(net, AF_INET6); | |
2292 | } | |
2293 | ||
2294 | static struct pernet_operations ip6_tables_net_ops = { | |
2295 | .init = ip6_tables_net_init, | |
2296 | .exit = ip6_tables_net_exit, | |
2297 | }; | |
2298 | ||
65b4b4e8 | 2299 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2300 | { |
2301 | int ret; | |
2302 | ||
3cb609d5 | 2303 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2304 | if (ret < 0) |
2305 | goto err1; | |
2e4e6a17 | 2306 | |
1da177e4 | 2307 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2308 | ret = xt_register_target(&ip6t_standard_target); |
2309 | if (ret < 0) | |
2310 | goto err2; | |
2311 | ret = xt_register_target(&ip6t_error_target); | |
2312 | if (ret < 0) | |
2313 | goto err3; | |
2314 | ret = xt_register_match(&icmp6_matchstruct); | |
2315 | if (ret < 0) | |
2316 | goto err4; | |
1da177e4 LT |
2317 | |
2318 | /* Register setsockopt */ | |
2319 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2320 | if (ret < 0) |
2321 | goto err5; | |
1da177e4 | 2322 | |
a887c1c1 | 2323 | printk(KERN_INFO "ip6_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2324 | return 0; |
0eff66e6 PM |
2325 | |
2326 | err5: | |
2327 | xt_unregister_match(&icmp6_matchstruct); | |
2328 | err4: | |
2329 | xt_unregister_target(&ip6t_error_target); | |
2330 | err3: | |
2331 | xt_unregister_target(&ip6t_standard_target); | |
2332 | err2: | |
3cb609d5 | 2333 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2334 | err1: |
2335 | return ret; | |
1da177e4 LT |
2336 | } |
2337 | ||
65b4b4e8 | 2338 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2339 | { |
2340 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2341 | |
a45049c5 PNA |
2342 | xt_unregister_match(&icmp6_matchstruct); |
2343 | xt_unregister_target(&ip6t_error_target); | |
2344 | xt_unregister_target(&ip6t_standard_target); | |
3cb609d5 AD |
2345 | |
2346 | unregister_pernet_subsys(&ip6_tables_net_ops); | |
1da177e4 LT |
2347 | } |
2348 | ||
e674d0f3 | 2349 | /* |
b777e0ce PM |
2350 | * find the offset to specified header or the protocol number of last header |
2351 | * if target < 0. "last header" is transport protocol header, ESP, or | |
2352 | * "No next header". | |
2353 | * | |
2354 | * If target header is found, its offset is set in *offset and return protocol | |
2355 | * number. Otherwise, return -1. | |
2356 | * | |
6d381634 PM |
2357 | * If the first fragment doesn't contain the final protocol header or |
2358 | * NEXTHDR_NONE it is considered invalid. | |
2359 | * | |
b777e0ce PM |
2360 | * Note that non-1st fragment is special case that "the protocol number |
2361 | * of last header" is "next header" field in Fragment header. In this case, | |
2362 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
2363 | * isn't NULL. | |
e674d0f3 | 2364 | * |
e674d0f3 | 2365 | */ |
b777e0ce PM |
2366 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
2367 | int target, unsigned short *fragoff) | |
e674d0f3 | 2368 | { |
6b88dd96 | 2369 | unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); |
0660e03f | 2370 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
e674d0f3 YK |
2371 | unsigned int len = skb->len - start; |
2372 | ||
b777e0ce PM |
2373 | if (fragoff) |
2374 | *fragoff = 0; | |
2375 | ||
e674d0f3 YK |
2376 | while (nexthdr != target) { |
2377 | struct ipv6_opt_hdr _hdr, *hp; | |
2378 | unsigned int hdrlen; | |
2379 | ||
b777e0ce PM |
2380 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
2381 | if (target < 0) | |
2382 | break; | |
6d381634 | 2383 | return -ENOENT; |
b777e0ce PM |
2384 | } |
2385 | ||
e674d0f3 YK |
2386 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
2387 | if (hp == NULL) | |
6d381634 | 2388 | return -EBADMSG; |
e674d0f3 | 2389 | if (nexthdr == NEXTHDR_FRAGMENT) { |
e69a4adc AV |
2390 | unsigned short _frag_off; |
2391 | __be16 *fp; | |
e674d0f3 YK |
2392 | fp = skb_header_pointer(skb, |
2393 | start+offsetof(struct frag_hdr, | |
2394 | frag_off), | |
2395 | sizeof(_frag_off), | |
2396 | &_frag_off); | |
2397 | if (fp == NULL) | |
6d381634 | 2398 | return -EBADMSG; |
e674d0f3 | 2399 | |
b777e0ce PM |
2400 | _frag_off = ntohs(*fp) & ~0x7; |
2401 | if (_frag_off) { | |
2402 | if (target < 0 && | |
2403 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
337dde79 | 2404 | hp->nexthdr == NEXTHDR_NONE)) { |
b777e0ce PM |
2405 | if (fragoff) |
2406 | *fragoff = _frag_off; | |
2407 | return hp->nexthdr; | |
2408 | } | |
6d381634 | 2409 | return -ENOENT; |
b777e0ce | 2410 | } |
e674d0f3 YK |
2411 | hdrlen = 8; |
2412 | } else if (nexthdr == NEXTHDR_AUTH) | |
1ab1457c | 2413 | hdrlen = (hp->hdrlen + 2) << 2; |
e674d0f3 | 2414 | else |
1ab1457c | 2415 | hdrlen = ipv6_optlen(hp); |
e674d0f3 YK |
2416 | |
2417 | nexthdr = hp->nexthdr; | |
2418 | len -= hdrlen; | |
2419 | start += hdrlen; | |
2420 | } | |
2421 | ||
2422 | *offset = start; | |
b777e0ce | 2423 | return nexthdr; |
e674d0f3 YK |
2424 | } |
2425 | ||
1da177e4 LT |
2426 | EXPORT_SYMBOL(ip6t_register_table); |
2427 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2428 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2429 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 2430 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 2431 | |
65b4b4e8 AM |
2432 | module_init(ip6_tables_init); |
2433 | module_exit(ip6_tables_fini); |