Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Packet matching code. | |
3 | * | |
4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
6b7d31fc | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
1da177e4 | 10 | */ |
90e7d4ab | 11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
4fc268d2 | 12 | #include <linux/capability.h> |
14c85021 | 13 | #include <linux/in.h> |
1da177e4 LT |
14 | #include <linux/skbuff.h> |
15 | #include <linux/kmod.h> | |
16 | #include <linux/vmalloc.h> | |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/module.h> | |
4bdbf6c0 | 19 | #include <linux/poison.h> |
1da177e4 | 20 | #include <linux/icmpv6.h> |
1da177e4 | 21 | #include <net/ipv6.h> |
3bc3fe5e | 22 | #include <net/compat.h> |
1da177e4 | 23 | #include <asm/uaccess.h> |
57b47a53 | 24 | #include <linux/mutex.h> |
1da177e4 | 25 | #include <linux/proc_fs.h> |
3bc3fe5e | 26 | #include <linux/err.h> |
c8923c6b | 27 | #include <linux/cpumask.h> |
1da177e4 LT |
28 | |
29 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
2e4e6a17 | 30 | #include <linux/netfilter/x_tables.h> |
f01ffbd6 | 31 | #include <net/netfilter/nf_log.h> |
e3eaa991 | 32 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
33 | |
34 | MODULE_LICENSE("GPL"); | |
35 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
36 | MODULE_DESCRIPTION("IPv6 packet filter"); | |
37 | ||
1da177e4 LT |
38 | /*#define DEBUG_IP_FIREWALL*/ |
39 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
40 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
41 | ||
42 | #ifdef DEBUG_IP_FIREWALL | |
ff67e4e4 | 43 | #define dprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
44 | #else |
45 | #define dprintf(format, args...) | |
46 | #endif | |
47 | ||
48 | #ifdef DEBUG_IP_FIREWALL_USER | |
ff67e4e4 | 49 | #define duprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
50 | #else |
51 | #define duprintf(format, args...) | |
52 | #endif | |
53 | ||
54 | #ifdef CONFIG_NETFILTER_DEBUG | |
55 | #define IP_NF_ASSERT(x) \ | |
56 | do { \ | |
57 | if (!(x)) \ | |
58 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ | |
0dc47877 | 59 | __func__, __FILE__, __LINE__); \ |
1da177e4 LT |
60 | } while(0) |
61 | #else | |
62 | #define IP_NF_ASSERT(x) | |
63 | #endif | |
1da177e4 | 64 | |
1da177e4 LT |
65 | #if 0 |
66 | /* All the better to debug you with... */ | |
67 | #define static | |
68 | #define inline | |
69 | #endif | |
70 | ||
e3eaa991 JE |
71 | void *ip6t_alloc_initial_table(const struct xt_table *info) |
72 | { | |
73 | return xt_alloc_initial_table(ip6t, IP6T); | |
74 | } | |
75 | EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table); | |
76 | ||
6b7d31fc | 77 | /* |
1da177e4 | 78 | We keep a set of rules for each CPU, so we can avoid write-locking |
6b7d31fc HW |
79 | them in the softirq when updating the counters and therefore |
80 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
81 | context stops packets coming through and allows user context to read | |
82 | the counters or update the rules. | |
1da177e4 | 83 | |
1da177e4 LT |
84 | Hence the start of any table is given by get_table() below. */ |
85 | ||
1da177e4 | 86 | /* Check for an extension */ |
1ab1457c | 87 | int |
1da177e4 LT |
88 | ip6t_ext_hdr(u8 nexthdr) |
89 | { | |
1ab1457c YH |
90 | return ( (nexthdr == IPPROTO_HOPOPTS) || |
91 | (nexthdr == IPPROTO_ROUTING) || | |
92 | (nexthdr == IPPROTO_FRAGMENT) || | |
93 | (nexthdr == IPPROTO_ESP) || | |
94 | (nexthdr == IPPROTO_AH) || | |
95 | (nexthdr == IPPROTO_NONE) || | |
96 | (nexthdr == IPPROTO_DSTOPTS) ); | |
1da177e4 LT |
97 | } |
98 | ||
99 | /* Returns whether matches rule or not. */ | |
022748a9 | 100 | /* Performance critical - called for every packet */ |
1d93a9cb | 101 | static inline bool |
1da177e4 LT |
102 | ip6_packet_match(const struct sk_buff *skb, |
103 | const char *indev, | |
104 | const char *outdev, | |
105 | const struct ip6t_ip6 *ip6info, | |
106 | unsigned int *protoff, | |
cff533ac | 107 | int *fragoff, bool *hotdrop) |
1da177e4 | 108 | { |
1da177e4 | 109 | unsigned long ret; |
0660e03f | 110 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
1da177e4 | 111 | |
e79ec50b | 112 | #define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg))) |
1da177e4 | 113 | |
f2ffd9ee | 114 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
3666ed1c JP |
115 | &ip6info->src), IP6T_INV_SRCIP) || |
116 | FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, | |
117 | &ip6info->dst), IP6T_INV_DSTIP)) { | |
1da177e4 LT |
118 | dprintf("Source or dest mismatch.\n"); |
119 | /* | |
120 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, | |
121 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, | |
122 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); | |
123 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, | |
124 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, | |
125 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ | |
1d93a9cb | 126 | return false; |
1da177e4 LT |
127 | } |
128 | ||
b8dfe498 | 129 | ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask); |
1da177e4 LT |
130 | |
131 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { | |
132 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
133 | indev, ip6info->iniface, | |
134 | ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":""); | |
1d93a9cb | 135 | return false; |
1da177e4 LT |
136 | } |
137 | ||
b8dfe498 | 138 | ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask); |
1da177e4 LT |
139 | |
140 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { | |
141 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
142 | outdev, ip6info->outiface, | |
143 | ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":""); | |
1d93a9cb | 144 | return false; |
1da177e4 LT |
145 | } |
146 | ||
147 | /* ... might want to do something with class and flowlabel here ... */ | |
148 | ||
149 | /* look for the desired protocol header */ | |
150 | if((ip6info->flags & IP6T_F_PROTO)) { | |
b777e0ce PM |
151 | int protohdr; |
152 | unsigned short _frag_off; | |
1da177e4 | 153 | |
b777e0ce | 154 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off); |
51d8b1a6 PM |
155 | if (protohdr < 0) { |
156 | if (_frag_off == 0) | |
cff533ac | 157 | *hotdrop = true; |
1d93a9cb | 158 | return false; |
51d8b1a6 | 159 | } |
b777e0ce | 160 | *fragoff = _frag_off; |
1da177e4 LT |
161 | |
162 | dprintf("Packet protocol %hi ?= %s%hi.\n", | |
1ab1457c | 163 | protohdr, |
1da177e4 LT |
164 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
165 | ip6info->proto); | |
166 | ||
b777e0ce | 167 | if (ip6info->proto == protohdr) { |
1da177e4 | 168 | if(ip6info->invflags & IP6T_INV_PROTO) { |
1d93a9cb | 169 | return false; |
1da177e4 | 170 | } |
1d93a9cb | 171 | return true; |
1da177e4 LT |
172 | } |
173 | ||
174 | /* We need match for the '-p all', too! */ | |
175 | if ((ip6info->proto != 0) && | |
176 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
1d93a9cb | 177 | return false; |
1da177e4 | 178 | } |
1d93a9cb | 179 | return true; |
1da177e4 LT |
180 | } |
181 | ||
182 | /* should be ip6 safe */ | |
022748a9 | 183 | static bool |
1da177e4 LT |
184 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
185 | { | |
186 | if (ipv6->flags & ~IP6T_F_MASK) { | |
187 | duprintf("Unknown flag bits set: %08X\n", | |
188 | ipv6->flags & ~IP6T_F_MASK); | |
ccb79bdc | 189 | return false; |
1da177e4 LT |
190 | } |
191 | if (ipv6->invflags & ~IP6T_INV_MASK) { | |
192 | duprintf("Unknown invflag bits set: %08X\n", | |
193 | ipv6->invflags & ~IP6T_INV_MASK); | |
ccb79bdc | 194 | return false; |
1da177e4 | 195 | } |
ccb79bdc | 196 | return true; |
1da177e4 LT |
197 | } |
198 | ||
199 | static unsigned int | |
4b560b44 | 200 | ip6t_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 LT |
201 | { |
202 | if (net_ratelimit()) | |
ff67e4e4 | 203 | pr_info("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
204 | |
205 | return NF_DROP; | |
206 | } | |
207 | ||
1da177e4 | 208 | static inline struct ip6t_entry * |
d5d1baa1 | 209 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
210 | { |
211 | return (struct ip6t_entry *)(base + offset); | |
212 | } | |
213 | ||
ba9dda3a | 214 | /* All zeroes == unconditional rule. */ |
022748a9 | 215 | /* Mildly perf critical (only if packet tracing is on) */ |
47901dc2 | 216 | static inline bool unconditional(const struct ip6t_ip6 *ipv6) |
ba9dda3a | 217 | { |
47901dc2 | 218 | static const struct ip6t_ip6 uncond; |
ba9dda3a | 219 | |
47901dc2 | 220 | return memcmp(ipv6, &uncond, sizeof(uncond)) == 0; |
ba9dda3a JK |
221 | } |
222 | ||
d5d1baa1 JE |
223 | static inline const struct ip6t_entry_target * |
224 | ip6t_get_target_c(const struct ip6t_entry *e) | |
225 | { | |
226 | return ip6t_get_target((struct ip6t_entry *)e); | |
227 | } | |
228 | ||
ba9dda3a JK |
229 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
230 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
231 | /* This cries for unification! */ | |
022748a9 | 232 | static const char *const hooknames[] = { |
6e23ae2a PM |
233 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
234 | [NF_INET_LOCAL_IN] = "INPUT", | |
235 | [NF_INET_FORWARD] = "FORWARD", | |
236 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
237 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
238 | }; |
239 | ||
240 | enum nf_ip_trace_comments { | |
241 | NF_IP6_TRACE_COMMENT_RULE, | |
242 | NF_IP6_TRACE_COMMENT_RETURN, | |
243 | NF_IP6_TRACE_COMMENT_POLICY, | |
244 | }; | |
245 | ||
022748a9 | 246 | static const char *const comments[] = { |
ba9dda3a JK |
247 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
248 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
249 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
250 | }; | |
251 | ||
252 | static struct nf_loginfo trace_loginfo = { | |
253 | .type = NF_LOG_TYPE_LOG, | |
254 | .u = { | |
255 | .log = { | |
256 | .level = 4, | |
257 | .logflags = NF_LOG_MASK, | |
258 | }, | |
259 | }, | |
260 | }; | |
261 | ||
022748a9 | 262 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 263 | static inline int |
d5d1baa1 | 264 | get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e, |
4f2f6f23 JE |
265 | const char *hookname, const char **chainname, |
266 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 267 | { |
d5d1baa1 | 268 | const struct ip6t_standard_target *t = (void *)ip6t_get_target_c(s); |
ba9dda3a JK |
269 | |
270 | if (strcmp(t->target.u.kernel.target->name, IP6T_ERROR_TARGET) == 0) { | |
271 | /* Head of user chain: ERROR target with chainname */ | |
272 | *chainname = t->target.data; | |
273 | (*rulenum) = 0; | |
274 | } else if (s == e) { | |
275 | (*rulenum)++; | |
276 | ||
3666ed1c JP |
277 | if (s->target_offset == sizeof(struct ip6t_entry) && |
278 | strcmp(t->target.u.kernel.target->name, | |
279 | IP6T_STANDARD_TARGET) == 0 && | |
280 | t->verdict < 0 && | |
281 | unconditional(&s->ipv6)) { | |
ba9dda3a JK |
282 | /* Tail of chains: STANDARD target (return/policy) */ |
283 | *comment = *chainname == hookname | |
4f2f6f23 JE |
284 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
285 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
286 | } |
287 | return 1; | |
288 | } else | |
289 | (*rulenum)++; | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
d5d1baa1 | 294 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
295 | unsigned int hook, |
296 | const struct net_device *in, | |
297 | const struct net_device *out, | |
ecb6f85e | 298 | const char *tablename, |
d5d1baa1 JE |
299 | const struct xt_table_info *private, |
300 | const struct ip6t_entry *e) | |
ba9dda3a | 301 | { |
d5d1baa1 | 302 | const void *table_base; |
5452e425 | 303 | const struct ip6t_entry *root; |
4f2f6f23 | 304 | const char *hookname, *chainname, *comment; |
72b2b1dd | 305 | const struct ip6t_entry *iter; |
ba9dda3a JK |
306 | unsigned int rulenum = 0; |
307 | ||
ccf5bd8c | 308 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
309 | root = get_entry(table_base, private->hook_entry[hook]); |
310 | ||
4f2f6f23 JE |
311 | hookname = chainname = hooknames[hook]; |
312 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; | |
ba9dda3a | 313 | |
72b2b1dd JE |
314 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
315 | if (get_chainname_rulenum(iter, e, hookname, | |
316 | &chainname, &comment, &rulenum) != 0) | |
317 | break; | |
ba9dda3a JK |
318 | |
319 | nf_log_packet(AF_INET6, hook, skb, in, out, &trace_loginfo, | |
320 | "TRACE: %s:%s:%s:%u ", | |
321 | tablename, chainname, comment, rulenum); | |
322 | } | |
323 | #endif | |
324 | ||
98e86403 JE |
325 | static inline __pure struct ip6t_entry * |
326 | ip6t_next_entry(const struct ip6t_entry *entry) | |
327 | { | |
328 | return (void *)entry + entry->next_offset; | |
329 | } | |
330 | ||
1da177e4 LT |
331 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
332 | unsigned int | |
3db05fea | 333 | ip6t_do_table(struct sk_buff *skb, |
1da177e4 LT |
334 | unsigned int hook, |
335 | const struct net_device *in, | |
336 | const struct net_device *out, | |
fe1cb108 | 337 | struct xt_table *table) |
1da177e4 | 338 | { |
6b7d31fc | 339 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
340 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
341 | unsigned int verdict = NF_DROP; | |
342 | const char *indev, *outdev; | |
d5d1baa1 | 343 | const void *table_base; |
f3c5c1bf JE |
344 | struct ip6t_entry *e, **jumpstack; |
345 | unsigned int *stackptr, origptr, cpu; | |
d5d1baa1 | 346 | const struct xt_table_info *private; |
de74c169 | 347 | struct xt_action_param acpar; |
1da177e4 LT |
348 | |
349 | /* Initialization */ | |
350 | indev = in ? in->name : nulldevname; | |
351 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
352 | /* We handle fragments by dealing with the first fragment as |
353 | * if it was a normal packet. All other fragments are treated | |
354 | * normally, except that they will NEVER match rules that ask | |
355 | * things we don't know, ie. tcp syn flag or ports). If the | |
356 | * rule is also a fragment-specific rule, non-fragments won't | |
357 | * match it. */ | |
b4ba2611 | 358 | acpar.hotdrop = false; |
de74c169 JE |
359 | acpar.in = in; |
360 | acpar.out = out; | |
361 | acpar.family = NFPROTO_IPV6; | |
362 | acpar.hooknum = hook; | |
1da177e4 | 363 | |
1da177e4 | 364 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
78454473 | 365 | |
942e4a2b SH |
366 | xt_info_rdlock_bh(); |
367 | private = table->private; | |
f3c5c1bf JE |
368 | cpu = smp_processor_id(); |
369 | table_base = private->entries[cpu]; | |
370 | jumpstack = (struct ip6t_entry **)private->jumpstack[cpu]; | |
371 | stackptr = &private->stackptr[cpu]; | |
372 | origptr = *stackptr; | |
78454473 | 373 | |
2e4e6a17 | 374 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 375 | |
1da177e4 | 376 | do { |
d5d1baa1 | 377 | const struct ip6t_entry_target *t; |
dcea992a | 378 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 379 | |
1da177e4 | 380 | IP_NF_ASSERT(e); |
a1ff4ac8 | 381 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
b4ba2611 | 382 | &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) { |
dcea992a | 383 | no_match: |
a1ff4ac8 JE |
384 | e = ip6t_next_entry(e); |
385 | continue; | |
386 | } | |
1da177e4 | 387 | |
ef53d702 | 388 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
389 | acpar.match = ematch->u.kernel.match; |
390 | acpar.matchinfo = ematch->data; | |
391 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 392 | goto no_match; |
ef53d702 | 393 | } |
dcea992a | 394 | |
a1ff4ac8 JE |
395 | ADD_COUNTER(e->counters, |
396 | ntohs(ipv6_hdr(skb)->payload_len) + | |
397 | sizeof(struct ipv6hdr), 1); | |
1da177e4 | 398 | |
d5d1baa1 | 399 | t = ip6t_get_target_c(e); |
a1ff4ac8 | 400 | IP_NF_ASSERT(t->u.kernel.target); |
ba9dda3a JK |
401 | |
402 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
403 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
a1ff4ac8 JE |
404 | /* The packet is traced: log it */ |
405 | if (unlikely(skb->nf_trace)) | |
406 | trace_packet(skb, hook, in, out, | |
407 | table->name, private, e); | |
ba9dda3a | 408 | #endif |
a1ff4ac8 JE |
409 | /* Standard target? */ |
410 | if (!t->u.kernel.target->target) { | |
411 | int v; | |
412 | ||
413 | v = ((struct ip6t_standard_target *)t)->verdict; | |
414 | if (v < 0) { | |
415 | /* Pop from stack? */ | |
416 | if (v != IP6T_RETURN) { | |
417 | verdict = (unsigned)(-v) - 1; | |
418 | break; | |
1da177e4 | 419 | } |
f3c5c1bf JE |
420 | if (*stackptr == 0) |
421 | e = get_entry(table_base, | |
422 | private->underflow[hook]); | |
423 | else | |
424 | e = ip6t_next_entry(jumpstack[--*stackptr]); | |
a1ff4ac8 JE |
425 | continue; |
426 | } | |
3666ed1c JP |
427 | if (table_base + v != ip6t_next_entry(e) && |
428 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
f3c5c1bf JE |
429 | if (*stackptr >= private->stacksize) { |
430 | verdict = NF_DROP; | |
431 | break; | |
432 | } | |
433 | jumpstack[(*stackptr)++] = e; | |
a1ff4ac8 | 434 | } |
1da177e4 | 435 | |
a1ff4ac8 | 436 | e = get_entry(table_base, v); |
7a6b1c46 JE |
437 | continue; |
438 | } | |
439 | ||
de74c169 JE |
440 | acpar.target = t->u.kernel.target; |
441 | acpar.targinfo = t->data; | |
7eb35586 | 442 | |
de74c169 | 443 | verdict = t->u.kernel.target->target(skb, &acpar); |
7a6b1c46 JE |
444 | if (verdict == IP6T_CONTINUE) |
445 | e = ip6t_next_entry(e); | |
446 | else | |
447 | /* Verdict */ | |
448 | break; | |
b4ba2611 | 449 | } while (!acpar.hotdrop); |
1da177e4 | 450 | |
942e4a2b | 451 | xt_info_rdunlock_bh(); |
f3c5c1bf | 452 | *stackptr = origptr; |
1da177e4 LT |
453 | |
454 | #ifdef DEBUG_ALLOW_ALL | |
455 | return NF_ACCEPT; | |
456 | #else | |
b4ba2611 | 457 | if (acpar.hotdrop) |
1da177e4 LT |
458 | return NF_DROP; |
459 | else return verdict; | |
460 | #endif | |
461 | } | |
462 | ||
1da177e4 LT |
463 | /* Figures out from what hook each rule can be called: returns 0 if |
464 | there are loops. Puts hook bitmask in comefrom. */ | |
465 | static int | |
d5d1baa1 | 466 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 467 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
468 | { |
469 | unsigned int hook; | |
470 | ||
471 | /* No recursion; use packet counter to save back ptrs (reset | |
472 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 473 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 474 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 475 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
476 | |
477 | if (!(valid_hooks & (1 << hook))) | |
478 | continue; | |
479 | ||
480 | /* Set initial back pointer. */ | |
481 | e->counters.pcnt = pos; | |
482 | ||
483 | for (;;) { | |
d5d1baa1 JE |
484 | const struct ip6t_standard_target *t |
485 | = (void *)ip6t_get_target_c(e); | |
9c547959 | 486 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 487 | |
6e23ae2a | 488 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
489 | printk("iptables: loop hook %u pos %u %08X.\n", |
490 | hook, pos, e->comefrom); | |
491 | return 0; | |
492 | } | |
9c547959 | 493 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
494 | |
495 | /* Unconditional return/END. */ | |
3666ed1c JP |
496 | if ((e->target_offset == sizeof(struct ip6t_entry) && |
497 | (strcmp(t->target.u.user.name, | |
498 | IP6T_STANDARD_TARGET) == 0) && | |
499 | t->verdict < 0 && | |
500 | unconditional(&e->ipv6)) || visited) { | |
1da177e4 LT |
501 | unsigned int oldpos, size; |
502 | ||
1f9352ae PM |
503 | if ((strcmp(t->target.u.user.name, |
504 | IP6T_STANDARD_TARGET) == 0) && | |
505 | t->verdict < -NF_MAX_VERDICT - 1) { | |
74c9c0c1 DM |
506 | duprintf("mark_source_chains: bad " |
507 | "negative verdict (%i)\n", | |
508 | t->verdict); | |
509 | return 0; | |
510 | } | |
511 | ||
1da177e4 LT |
512 | /* Return: backtrack through the last |
513 | big jump. */ | |
514 | do { | |
6e23ae2a | 515 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
516 | #ifdef DEBUG_IP_FIREWALL_USER |
517 | if (e->comefrom | |
6e23ae2a | 518 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
519 | duprintf("Back unset " |
520 | "on hook %u " | |
521 | "rule %u\n", | |
522 | hook, pos); | |
523 | } | |
524 | #endif | |
525 | oldpos = pos; | |
526 | pos = e->counters.pcnt; | |
527 | e->counters.pcnt = 0; | |
528 | ||
529 | /* We're at the start. */ | |
530 | if (pos == oldpos) | |
531 | goto next; | |
532 | ||
533 | e = (struct ip6t_entry *) | |
31836064 | 534 | (entry0 + pos); |
1da177e4 LT |
535 | } while (oldpos == pos + e->next_offset); |
536 | ||
537 | /* Move along one */ | |
538 | size = e->next_offset; | |
539 | e = (struct ip6t_entry *) | |
31836064 | 540 | (entry0 + pos + size); |
1da177e4 LT |
541 | e->counters.pcnt = pos; |
542 | pos += size; | |
543 | } else { | |
544 | int newpos = t->verdict; | |
545 | ||
546 | if (strcmp(t->target.u.user.name, | |
3666ed1c JP |
547 | IP6T_STANDARD_TARGET) == 0 && |
548 | newpos >= 0) { | |
74c9c0c1 DM |
549 | if (newpos > newinfo->size - |
550 | sizeof(struct ip6t_entry)) { | |
551 | duprintf("mark_source_chains: " | |
552 | "bad verdict (%i)\n", | |
553 | newpos); | |
554 | return 0; | |
555 | } | |
1da177e4 LT |
556 | /* This a jump; chase it. */ |
557 | duprintf("Jump rule %u -> %u\n", | |
558 | pos, newpos); | |
559 | } else { | |
560 | /* ... this is a fallthru */ | |
561 | newpos = pos + e->next_offset; | |
562 | } | |
563 | e = (struct ip6t_entry *) | |
31836064 | 564 | (entry0 + newpos); |
1da177e4 LT |
565 | e->counters.pcnt = pos; |
566 | pos = newpos; | |
567 | } | |
568 | } | |
569 | next: | |
570 | duprintf("Finished chain %u\n", hook); | |
571 | } | |
572 | return 1; | |
573 | } | |
574 | ||
6bdb331b | 575 | static void cleanup_match(struct ip6t_entry_match *m, struct net *net) |
1da177e4 | 576 | { |
6be3d859 JE |
577 | struct xt_mtdtor_param par; |
578 | ||
f54e9367 | 579 | par.net = net; |
6be3d859 JE |
580 | par.match = m->u.kernel.match; |
581 | par.matchinfo = m->data; | |
916a917d | 582 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
583 | if (par.match->destroy != NULL) |
584 | par.match->destroy(&par); | |
585 | module_put(par.match->me); | |
1da177e4 LT |
586 | } |
587 | ||
022748a9 | 588 | static int |
d5d1baa1 | 589 | check_entry(const struct ip6t_entry *e, const char *name) |
f173c8a1 | 590 | { |
d5d1baa1 | 591 | const struct ip6t_entry_target *t; |
f173c8a1 PM |
592 | |
593 | if (!ip6_checkentry(&e->ipv6)) { | |
594 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
595 | return -EINVAL; | |
596 | } | |
597 | ||
598 | if (e->target_offset + sizeof(struct ip6t_entry_target) > | |
599 | e->next_offset) | |
600 | return -EINVAL; | |
601 | ||
d5d1baa1 | 602 | t = ip6t_get_target_c(e); |
f173c8a1 PM |
603 | if (e->target_offset + t->u.target_size > e->next_offset) |
604 | return -EINVAL; | |
605 | ||
606 | return 0; | |
607 | } | |
608 | ||
6bdb331b | 609 | static int check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par) |
f173c8a1 | 610 | { |
9b4fce7a | 611 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
612 | int ret; |
613 | ||
9b4fce7a JE |
614 | par->match = m->u.kernel.match; |
615 | par->matchinfo = m->data; | |
616 | ||
916a917d | 617 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 618 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
367c6790 | 619 | if (ret < 0) { |
f173c8a1 | 620 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 621 | par.match->name); |
367c6790 | 622 | return ret; |
f173c8a1 | 623 | } |
367c6790 | 624 | return 0; |
f173c8a1 PM |
625 | } |
626 | ||
022748a9 | 627 | static int |
6bdb331b | 628 | find_check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 629 | { |
6709dbbb | 630 | struct xt_match *match; |
3cdc7c95 | 631 | int ret; |
1da177e4 | 632 | |
fd0ec0e6 JE |
633 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
634 | m->u.user.revision); | |
635 | if (IS_ERR(match)) { | |
f173c8a1 | 636 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 637 | return PTR_ERR(match); |
1da177e4 LT |
638 | } |
639 | m->u.kernel.match = match; | |
1da177e4 | 640 | |
6bdb331b | 641 | ret = check_match(m, par); |
3cdc7c95 PM |
642 | if (ret) |
643 | goto err; | |
644 | ||
1da177e4 | 645 | return 0; |
3cdc7c95 PM |
646 | err: |
647 | module_put(m->u.kernel.match->me); | |
648 | return ret; | |
1da177e4 LT |
649 | } |
650 | ||
add67461 | 651 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 652 | { |
af5d6dc2 JE |
653 | struct ip6t_entry_target *t = ip6t_get_target(e); |
654 | struct xt_tgchk_param par = { | |
add67461 | 655 | .net = net, |
af5d6dc2 JE |
656 | .table = name, |
657 | .entryinfo = e, | |
658 | .target = t->u.kernel.target, | |
659 | .targinfo = t->data, | |
660 | .hook_mask = e->comefrom, | |
916a917d | 661 | .family = NFPROTO_IPV6, |
af5d6dc2 | 662 | }; |
1da177e4 | 663 | int ret; |
1da177e4 | 664 | |
f173c8a1 | 665 | t = ip6t_get_target(e); |
916a917d | 666 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 667 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
367c6790 | 668 | if (ret < 0) { |
f173c8a1 PM |
669 | duprintf("ip_tables: check failed for `%s'.\n", |
670 | t->u.kernel.target->name); | |
367c6790 | 671 | return ret; |
1da177e4 | 672 | } |
367c6790 | 673 | return 0; |
f173c8a1 | 674 | } |
1da177e4 | 675 | |
022748a9 | 676 | static int |
a83d8e8d | 677 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
0559518b | 678 | unsigned int size) |
f173c8a1 PM |
679 | { |
680 | struct ip6t_entry_target *t; | |
681 | struct xt_target *target; | |
682 | int ret; | |
683 | unsigned int j; | |
9b4fce7a | 684 | struct xt_mtchk_param mtpar; |
dcea992a | 685 | struct xt_entry_match *ematch; |
f173c8a1 PM |
686 | |
687 | ret = check_entry(e, name); | |
688 | if (ret) | |
689 | return ret; | |
590bdf7f | 690 | |
1da177e4 | 691 | j = 0; |
a83d8e8d | 692 | mtpar.net = net; |
9b4fce7a JE |
693 | mtpar.table = name; |
694 | mtpar.entryinfo = &e->ipv6; | |
695 | mtpar.hook_mask = e->comefrom; | |
916a917d | 696 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 697 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 698 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 699 | if (ret != 0) |
6bdb331b JE |
700 | goto cleanup_matches; |
701 | ++j; | |
dcea992a | 702 | } |
1da177e4 LT |
703 | |
704 | t = ip6t_get_target(e); | |
d2a7b6ba JE |
705 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
706 | t->u.user.revision); | |
707 | if (IS_ERR(target)) { | |
f173c8a1 | 708 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 709 | ret = PTR_ERR(target); |
1da177e4 LT |
710 | goto cleanup_matches; |
711 | } | |
712 | t->u.kernel.target = target; | |
6b7d31fc | 713 | |
add67461 | 714 | ret = check_target(e, net, name); |
3cdc7c95 PM |
715 | if (ret) |
716 | goto err; | |
1da177e4 | 717 | return 0; |
3cdc7c95 PM |
718 | err: |
719 | module_put(t->u.kernel.target->me); | |
1da177e4 | 720 | cleanup_matches: |
6bdb331b JE |
721 | xt_ematch_foreach(ematch, e) { |
722 | if (j-- == 0) | |
dcea992a | 723 | break; |
6bdb331b JE |
724 | cleanup_match(ematch, net); |
725 | } | |
1da177e4 LT |
726 | return ret; |
727 | } | |
728 | ||
d5d1baa1 | 729 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 JE |
730 | { |
731 | const struct ip6t_entry_target *t; | |
732 | unsigned int verdict; | |
733 | ||
734 | if (!unconditional(&e->ipv6)) | |
735 | return false; | |
d5d1baa1 | 736 | t = ip6t_get_target_c(e); |
e2fe35c1 JE |
737 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
738 | return false; | |
739 | verdict = ((struct ip6t_standard_target *)t)->verdict; | |
740 | verdict = -verdict - 1; | |
741 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
742 | } | |
743 | ||
022748a9 | 744 | static int |
1da177e4 | 745 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 746 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
747 | const unsigned char *base, |
748 | const unsigned char *limit, | |
1da177e4 LT |
749 | const unsigned int *hook_entries, |
750 | const unsigned int *underflows, | |
0559518b | 751 | unsigned int valid_hooks) |
1da177e4 LT |
752 | { |
753 | unsigned int h; | |
754 | ||
3666ed1c JP |
755 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
756 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
1da177e4 LT |
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++) { |
a7d51738 JE |
770 | if (!(valid_hooks & (1 << h))) |
771 | continue; | |
1da177e4 LT |
772 | if ((unsigned char *)e - base == hook_entries[h]) |
773 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 774 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
775 | if (!check_underflow(e)) { |
776 | pr_err("Underflows must be unconditional and " | |
777 | "use the STANDARD target with " | |
778 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
779 | return -EINVAL; |
780 | } | |
1da177e4 | 781 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 782 | } |
1da177e4 LT |
783 | } |
784 | ||
1da177e4 | 785 | /* Clear counters and comefrom */ |
2e4e6a17 | 786 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 787 | e->comefrom = 0; |
1da177e4 LT |
788 | return 0; |
789 | } | |
790 | ||
0559518b | 791 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
1da177e4 | 792 | { |
a2df1648 | 793 | struct xt_tgdtor_param par; |
1da177e4 | 794 | struct ip6t_entry_target *t; |
dcea992a | 795 | struct xt_entry_match *ematch; |
1da177e4 | 796 | |
1da177e4 | 797 | /* Cleanup all matches */ |
dcea992a | 798 | xt_ematch_foreach(ematch, e) |
6bdb331b | 799 | cleanup_match(ematch, net); |
1da177e4 | 800 | t = ip6t_get_target(e); |
a2df1648 | 801 | |
add67461 | 802 | par.net = net; |
a2df1648 JE |
803 | par.target = t->u.kernel.target; |
804 | par.targinfo = t->data; | |
916a917d | 805 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
806 | if (par.target->destroy != NULL) |
807 | par.target->destroy(&par); | |
808 | module_put(par.target->me); | |
1da177e4 LT |
809 | } |
810 | ||
811 | /* Checks and translates the user-supplied table segment (held in | |
812 | newinfo) */ | |
813 | static int | |
0f234214 JE |
814 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
815 | const struct ip6t_replace *repl) | |
1da177e4 | 816 | { |
72b2b1dd | 817 | struct ip6t_entry *iter; |
1da177e4 | 818 | unsigned int i; |
72b2b1dd | 819 | int ret = 0; |
1da177e4 | 820 | |
0f234214 JE |
821 | newinfo->size = repl->size; |
822 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
823 | |
824 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 825 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
826 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
827 | newinfo->underflow[i] = 0xFFFFFFFF; | |
828 | } | |
829 | ||
830 | duprintf("translate_table: size %u\n", newinfo->size); | |
831 | i = 0; | |
832 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
833 | xt_entry_foreach(iter, entry0, newinfo->size) { |
834 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
835 | entry0 + repl->size, |
836 | repl->hook_entry, | |
837 | repl->underflow, | |
838 | repl->valid_hooks); | |
72b2b1dd | 839 | if (ret != 0) |
0559518b JE |
840 | return ret; |
841 | ++i; | |
f3c5c1bf JE |
842 | if (strcmp(ip6t_get_target(iter)->u.user.name, |
843 | XT_ERROR_TARGET) == 0) | |
844 | ++newinfo->stacksize; | |
72b2b1dd | 845 | } |
1da177e4 | 846 | |
0f234214 | 847 | if (i != repl->num_entries) { |
1da177e4 | 848 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 849 | i, repl->num_entries); |
1da177e4 LT |
850 | return -EINVAL; |
851 | } | |
852 | ||
853 | /* Check hooks all assigned */ | |
6e23ae2a | 854 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 855 | /* Only hooks which are valid */ |
0f234214 | 856 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
857 | continue; |
858 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
859 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 860 | i, repl->hook_entry[i]); |
1da177e4 LT |
861 | return -EINVAL; |
862 | } | |
863 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
864 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 865 | i, repl->underflow[i]); |
1da177e4 LT |
866 | return -EINVAL; |
867 | } | |
868 | } | |
869 | ||
0f234214 | 870 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
871 | return -ELOOP; |
872 | ||
1da177e4 LT |
873 | /* Finally, each sanity check must pass */ |
874 | i = 0; | |
72b2b1dd | 875 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 876 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
877 | if (ret != 0) |
878 | break; | |
0559518b | 879 | ++i; |
72b2b1dd | 880 | } |
1da177e4 | 881 | |
74c9c0c1 | 882 | if (ret != 0) { |
0559518b JE |
883 | xt_entry_foreach(iter, entry0, newinfo->size) { |
884 | if (i-- == 0) | |
72b2b1dd | 885 | break; |
0559518b JE |
886 | cleanup_entry(iter, net); |
887 | } | |
74c9c0c1 DM |
888 | return ret; |
889 | } | |
1da177e4 LT |
890 | |
891 | /* And one copy for every other CPU */ | |
6f912042 | 892 | for_each_possible_cpu(i) { |
31836064 ED |
893 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
894 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
895 | } |
896 | ||
9c547959 | 897 | return ret; |
1da177e4 LT |
898 | } |
899 | ||
1da177e4 | 900 | static void |
2e4e6a17 HW |
901 | get_counters(const struct xt_table_info *t, |
902 | struct xt_counters counters[]) | |
1da177e4 | 903 | { |
72b2b1dd | 904 | struct ip6t_entry *iter; |
1da177e4 LT |
905 | unsigned int cpu; |
906 | unsigned int i; | |
31836064 ED |
907 | unsigned int curcpu; |
908 | ||
909 | /* Instead of clearing (by a previous call to memset()) | |
910 | * the counters and using adds, we set the counters | |
911 | * with data used by 'current' CPU | |
942e4a2b SH |
912 | * |
913 | * Bottom half has to be disabled to prevent deadlock | |
914 | * if new softirq were to run and call ipt_do_table | |
31836064 | 915 | */ |
942e4a2b SH |
916 | local_bh_disable(); |
917 | curcpu = smp_processor_id(); | |
31836064 ED |
918 | |
919 | i = 0; | |
0559518b JE |
920 | xt_entry_foreach(iter, t->entries[curcpu], t->size) { |
921 | SET_COUNTER(counters[i], iter->counters.bcnt, | |
6b4ff2d7 | 922 | iter->counters.pcnt); |
0559518b JE |
923 | ++i; |
924 | } | |
1da177e4 | 925 | |
6f912042 | 926 | for_each_possible_cpu(cpu) { |
31836064 ED |
927 | if (cpu == curcpu) |
928 | continue; | |
1da177e4 | 929 | i = 0; |
942e4a2b | 930 | xt_info_wrlock(cpu); |
0559518b JE |
931 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
932 | ADD_COUNTER(counters[i], iter->counters.bcnt, | |
6b4ff2d7 | 933 | iter->counters.pcnt); |
0559518b JE |
934 | ++i; |
935 | } | |
942e4a2b | 936 | xt_info_wrunlock(cpu); |
1da177e4 | 937 | } |
78454473 SH |
938 | local_bh_enable(); |
939 | } | |
940 | ||
d5d1baa1 | 941 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 942 | { |
ed1a6f5e | 943 | unsigned int countersize; |
2e4e6a17 | 944 | struct xt_counters *counters; |
d5d1baa1 | 945 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
946 | |
947 | /* We need atomic snapshot of counters: rest doesn't change | |
948 | (other than comefrom, which userspace doesn't care | |
949 | about). */ | |
2e4e6a17 | 950 | countersize = sizeof(struct xt_counters) * private->number; |
3b84e92b | 951 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
952 | |
953 | if (counters == NULL) | |
942e4a2b | 954 | return ERR_PTR(-ENOMEM); |
78454473 | 955 | |
942e4a2b | 956 | get_counters(private, counters); |
78454473 | 957 | |
49a88d18 | 958 | return counters; |
ed1a6f5e PM |
959 | } |
960 | ||
961 | static int | |
962 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 963 | const struct xt_table *table, |
ed1a6f5e PM |
964 | void __user *userptr) |
965 | { | |
966 | unsigned int off, num; | |
d5d1baa1 | 967 | const struct ip6t_entry *e; |
ed1a6f5e | 968 | struct xt_counters *counters; |
5452e425 | 969 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 970 | int ret = 0; |
5452e425 | 971 | const void *loc_cpu_entry; |
ed1a6f5e PM |
972 | |
973 | counters = alloc_counters(table); | |
974 | if (IS_ERR(counters)) | |
975 | return PTR_ERR(counters); | |
976 | ||
9c547959 PM |
977 | /* choose the copy that is on our node/cpu, ... |
978 | * This choice is lazy (because current thread is | |
979 | * allowed to migrate to another cpu) | |
980 | */ | |
2e4e6a17 | 981 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 982 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
983 | ret = -EFAULT; |
984 | goto free_counters; | |
985 | } | |
986 | ||
987 | /* FIXME: use iterator macros --RR */ | |
988 | /* ... then go back and fix counters and names */ | |
989 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
990 | unsigned int i; | |
5452e425 JE |
991 | const struct ip6t_entry_match *m; |
992 | const struct ip6t_entry_target *t; | |
1da177e4 | 993 | |
31836064 | 994 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
995 | if (copy_to_user(userptr + off |
996 | + offsetof(struct ip6t_entry, counters), | |
997 | &counters[num], | |
998 | sizeof(counters[num])) != 0) { | |
999 | ret = -EFAULT; | |
1000 | goto free_counters; | |
1001 | } | |
1002 | ||
1003 | for (i = sizeof(struct ip6t_entry); | |
1004 | i < e->target_offset; | |
1005 | i += m->u.match_size) { | |
1006 | m = (void *)e + i; | |
1007 | ||
1008 | if (copy_to_user(userptr + off + i | |
1009 | + offsetof(struct ip6t_entry_match, | |
1010 | u.user.name), | |
1011 | m->u.kernel.match->name, | |
1012 | strlen(m->u.kernel.match->name)+1) | |
1013 | != 0) { | |
1014 | ret = -EFAULT; | |
1015 | goto free_counters; | |
1016 | } | |
1017 | } | |
1018 | ||
d5d1baa1 | 1019 | t = ip6t_get_target_c(e); |
1da177e4 LT |
1020 | if (copy_to_user(userptr + off + e->target_offset |
1021 | + offsetof(struct ip6t_entry_target, | |
1022 | u.user.name), | |
1023 | t->u.kernel.target->name, | |
1024 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1025 | ret = -EFAULT; | |
1026 | goto free_counters; | |
1027 | } | |
1028 | } | |
1029 | ||
1030 | free_counters: | |
1031 | vfree(counters); | |
1032 | return ret; | |
1033 | } | |
1034 | ||
3bc3fe5e | 1035 | #ifdef CONFIG_COMPAT |
739674fb | 1036 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
1037 | { |
1038 | int v = *(compat_int_t *)src; | |
1039 | ||
1040 | if (v > 0) | |
1041 | v += xt_compat_calc_jump(AF_INET6, v); | |
1042 | memcpy(dst, &v, sizeof(v)); | |
1043 | } | |
1044 | ||
739674fb | 1045 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
1046 | { |
1047 | compat_int_t cv = *(int *)src; | |
1048 | ||
1049 | if (cv > 0) | |
1050 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1051 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1052 | } | |
1053 | ||
d5d1baa1 | 1054 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 1055 | const struct xt_table_info *info, |
d5d1baa1 | 1056 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 1057 | { |
dcea992a | 1058 | const struct xt_entry_match *ematch; |
d5d1baa1 | 1059 | const struct ip6t_entry_target *t; |
3bc3fe5e PM |
1060 | unsigned int entry_offset; |
1061 | int off, i, ret; | |
1062 | ||
1063 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1064 | entry_offset = (void *)e - base; | |
dcea992a | 1065 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1066 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1067 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
1068 | off += xt_compat_target_offset(t->u.kernel.target); |
1069 | newinfo->size -= off; | |
1070 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1071 | if (ret) | |
1072 | return ret; | |
1073 | ||
1074 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1075 | if (info->hook_entry[i] && | |
1076 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1077 | newinfo->hook_entry[i] -= off; | |
1078 | if (info->underflow[i] && | |
1079 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1080 | newinfo->underflow[i] -= off; | |
1081 | } | |
1082 | return 0; | |
1083 | } | |
1084 | ||
1085 | static int compat_table_info(const struct xt_table_info *info, | |
1086 | struct xt_table_info *newinfo) | |
1087 | { | |
72b2b1dd | 1088 | struct ip6t_entry *iter; |
3bc3fe5e | 1089 | void *loc_cpu_entry; |
0559518b | 1090 | int ret; |
3bc3fe5e PM |
1091 | |
1092 | if (!newinfo || !info) | |
1093 | return -EINVAL; | |
1094 | ||
1095 | /* we dont care about newinfo->entries[] */ | |
1096 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1097 | newinfo->initial_entries = 0; | |
1098 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
72b2b1dd JE |
1099 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1100 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1101 | if (ret != 0) | |
0559518b | 1102 | return ret; |
72b2b1dd | 1103 | } |
0559518b | 1104 | return 0; |
3bc3fe5e PM |
1105 | } |
1106 | #endif | |
1107 | ||
d5d1baa1 JE |
1108 | static int get_info(struct net *net, void __user *user, |
1109 | const int *len, int compat) | |
433665c9 PM |
1110 | { |
1111 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1112 | struct xt_table *t; | |
1113 | int ret; | |
1114 | ||
1115 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1116 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1117 | sizeof(struct ip6t_getinfo)); |
1118 | return -EINVAL; | |
1119 | } | |
1120 | ||
1121 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1122 | return -EFAULT; | |
1123 | ||
1124 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; | |
3bc3fe5e PM |
1125 | #ifdef CONFIG_COMPAT |
1126 | if (compat) | |
1127 | xt_compat_lock(AF_INET6); | |
1128 | #endif | |
336b517f | 1129 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 PM |
1130 | "ip6table_%s", name); |
1131 | if (t && !IS_ERR(t)) { | |
1132 | struct ip6t_getinfo info; | |
5452e425 | 1133 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1134 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1135 | struct xt_table_info tmp; |
1136 | ||
3bc3fe5e | 1137 | if (compat) { |
3bc3fe5e PM |
1138 | ret = compat_table_info(private, &tmp); |
1139 | xt_compat_flush_offsets(AF_INET6); | |
1140 | private = &tmp; | |
1141 | } | |
1142 | #endif | |
433665c9 PM |
1143 | info.valid_hooks = t->valid_hooks; |
1144 | memcpy(info.hook_entry, private->hook_entry, | |
1145 | sizeof(info.hook_entry)); | |
1146 | memcpy(info.underflow, private->underflow, | |
1147 | sizeof(info.underflow)); | |
1148 | info.num_entries = private->number; | |
1149 | info.size = private->size; | |
b5dd674b | 1150 | strcpy(info.name, name); |
433665c9 PM |
1151 | |
1152 | if (copy_to_user(user, &info, *len) != 0) | |
1153 | ret = -EFAULT; | |
1154 | else | |
1155 | ret = 0; | |
1156 | ||
1157 | xt_table_unlock(t); | |
1158 | module_put(t->me); | |
1159 | } else | |
1160 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1161 | #ifdef CONFIG_COMPAT |
1162 | if (compat) | |
1163 | xt_compat_unlock(AF_INET6); | |
1164 | #endif | |
433665c9 PM |
1165 | return ret; |
1166 | } | |
1167 | ||
1da177e4 | 1168 | static int |
d5d1baa1 JE |
1169 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
1170 | const int *len) | |
1da177e4 LT |
1171 | { |
1172 | int ret; | |
d924357c | 1173 | struct ip6t_get_entries get; |
2e4e6a17 | 1174 | struct xt_table *t; |
1da177e4 | 1175 | |
d924357c | 1176 | if (*len < sizeof(get)) { |
c9d8fe13 | 1177 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1178 | return -EINVAL; |
1179 | } | |
1180 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1181 | return -EFAULT; | |
1182 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1183 | duprintf("get_entries: %u != %zu\n", |
1184 | *len, sizeof(get) + get.size); | |
d924357c PM |
1185 | return -EINVAL; |
1186 | } | |
1187 | ||
336b517f | 1188 | t = xt_find_table_lock(net, AF_INET6, get.name); |
6b7d31fc | 1189 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
1190 | struct xt_table_info *private = t->private; |
1191 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1192 | if (get.size == private->size) |
2e4e6a17 | 1193 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1194 | t, uptr->entrytable); |
1195 | else { | |
1196 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1197 | private->size, get.size); |
544473c1 | 1198 | ret = -EAGAIN; |
1da177e4 | 1199 | } |
6b7d31fc | 1200 | module_put(t->me); |
2e4e6a17 | 1201 | xt_table_unlock(t); |
1da177e4 | 1202 | } else |
6b7d31fc | 1203 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1204 | |
1205 | return ret; | |
1206 | } | |
1207 | ||
1208 | static int | |
336b517f | 1209 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1210 | struct xt_table_info *newinfo, unsigned int num_counters, |
1211 | void __user *counters_ptr) | |
1da177e4 LT |
1212 | { |
1213 | int ret; | |
2e4e6a17 | 1214 | struct xt_table *t; |
3bc3fe5e | 1215 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1216 | struct xt_counters *counters; |
5452e425 | 1217 | const void *loc_cpu_old_entry; |
72b2b1dd | 1218 | struct ip6t_entry *iter; |
1da177e4 | 1219 | |
3bc3fe5e PM |
1220 | ret = 0; |
1221 | counters = vmalloc_node(num_counters * sizeof(struct xt_counters), | |
3b84e92b | 1222 | numa_node_id()); |
1da177e4 LT |
1223 | if (!counters) { |
1224 | ret = -ENOMEM; | |
3bc3fe5e | 1225 | goto out; |
1da177e4 | 1226 | } |
1da177e4 | 1227 | |
336b517f | 1228 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1229 | "ip6table_%s", name); |
6b7d31fc HW |
1230 | if (!t || IS_ERR(t)) { |
1231 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1232 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1233 | } |
1da177e4 LT |
1234 | |
1235 | /* You lied! */ | |
3bc3fe5e | 1236 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1237 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1238 | valid_hooks, t->valid_hooks); |
1da177e4 | 1239 | ret = -EINVAL; |
6b7d31fc | 1240 | goto put_module; |
1da177e4 LT |
1241 | } |
1242 | ||
3bc3fe5e | 1243 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1244 | if (!oldinfo) |
1245 | goto put_module; | |
1246 | ||
1247 | /* Update module usage count based on number of rules */ | |
1248 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1249 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1250 | if ((oldinfo->number > oldinfo->initial_entries) || |
1251 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1252 | module_put(t->me); |
1253 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1254 | (newinfo->number <= oldinfo->initial_entries)) | |
1255 | module_put(t->me); | |
1256 | ||
942e4a2b | 1257 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1258 | get_counters(oldinfo, counters); |
942e4a2b | 1259 | |
1da177e4 | 1260 | /* Decrease module usage counts and free resource */ |
31836064 | 1261 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
72b2b1dd | 1262 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1263 | cleanup_entry(iter, net); |
72b2b1dd | 1264 | |
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 | |
d5d1baa1 | 1283 | do_replace(struct net *net, const 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; | |
72b2b1dd | 1289 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1290 | |
1291 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1292 | return -EFAULT; | |
1293 | ||
1294 | /* overflow check */ | |
1295 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1296 | return -ENOMEM; | |
1297 | ||
1298 | newinfo = xt_alloc_table_info(tmp.size); | |
1299 | if (!newinfo) | |
1300 | return -ENOMEM; | |
1301 | ||
1302 | /* choose the copy that is on our node/cpu */ | |
1303 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1304 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1305 | tmp.size) != 0) { | |
1306 | ret = -EFAULT; | |
1307 | goto free_newinfo; | |
1308 | } | |
1309 | ||
0f234214 | 1310 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1311 | if (ret != 0) |
1312 | goto free_newinfo; | |
1313 | ||
1314 | duprintf("ip_tables: Translated table\n"); | |
1315 | ||
336b517f | 1316 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1317 | tmp.num_counters, tmp.counters); |
1318 | if (ret) | |
1319 | goto free_newinfo_untrans; | |
1320 | return 0; | |
1321 | ||
1322 | free_newinfo_untrans: | |
72b2b1dd | 1323 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1324 | cleanup_entry(iter, net); |
1da177e4 | 1325 | free_newinfo: |
2e4e6a17 | 1326 | xt_free_table_info(newinfo); |
1da177e4 LT |
1327 | return ret; |
1328 | } | |
1329 | ||
1da177e4 | 1330 | static int |
d5d1baa1 | 1331 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
336b517f | 1332 | int compat) |
1da177e4 | 1333 | { |
942e4a2b | 1334 | unsigned int i, curcpu; |
3bc3fe5e PM |
1335 | struct xt_counters_info tmp; |
1336 | struct xt_counters *paddc; | |
1337 | unsigned int num_counters; | |
1338 | char *name; | |
1339 | int size; | |
1340 | void *ptmp; | |
2e4e6a17 | 1341 | struct xt_table *t; |
5452e425 | 1342 | const struct xt_table_info *private; |
6b7d31fc | 1343 | int ret = 0; |
5452e425 | 1344 | const void *loc_cpu_entry; |
72b2b1dd | 1345 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1346 | #ifdef CONFIG_COMPAT |
1347 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1348 | |
3bc3fe5e PM |
1349 | if (compat) { |
1350 | ptmp = &compat_tmp; | |
1351 | size = sizeof(struct compat_xt_counters_info); | |
1352 | } else | |
1353 | #endif | |
1354 | { | |
1355 | ptmp = &tmp; | |
1356 | size = sizeof(struct xt_counters_info); | |
1357 | } | |
1358 | ||
1359 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1360 | return -EFAULT; |
1361 | ||
3bc3fe5e PM |
1362 | #ifdef CONFIG_COMPAT |
1363 | if (compat) { | |
1364 | num_counters = compat_tmp.num_counters; | |
1365 | name = compat_tmp.name; | |
1366 | } else | |
1367 | #endif | |
1368 | { | |
1369 | num_counters = tmp.num_counters; | |
1370 | name = tmp.name; | |
1371 | } | |
1372 | ||
1373 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1374 | return -EINVAL; |
1375 | ||
3bc3fe5e | 1376 | paddc = vmalloc_node(len - size, numa_node_id()); |
1da177e4 LT |
1377 | if (!paddc) |
1378 | return -ENOMEM; | |
1379 | ||
3bc3fe5e | 1380 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1381 | ret = -EFAULT; |
1382 | goto free; | |
1383 | } | |
1384 | ||
336b517f | 1385 | t = xt_find_table_lock(net, AF_INET6, name); |
6b7d31fc HW |
1386 | if (!t || IS_ERR(t)) { |
1387 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1388 | goto free; |
6b7d31fc | 1389 | } |
1da177e4 | 1390 | |
942e4a2b SH |
1391 | |
1392 | local_bh_disable(); | |
2e4e6a17 | 1393 | private = t->private; |
3bc3fe5e | 1394 | if (private->number != num_counters) { |
1da177e4 LT |
1395 | ret = -EINVAL; |
1396 | goto unlock_up_free; | |
1397 | } | |
1398 | ||
1399 | i = 0; | |
31836064 | 1400 | /* Choose the copy that is on our node */ |
942e4a2b SH |
1401 | curcpu = smp_processor_id(); |
1402 | xt_info_wrlock(curcpu); | |
1403 | loc_cpu_entry = private->entries[curcpu]; | |
0559518b JE |
1404 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1405 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1406 | ++i; | |
1407 | } | |
942e4a2b SH |
1408 | xt_info_wrunlock(curcpu); |
1409 | ||
1da177e4 | 1410 | unlock_up_free: |
942e4a2b | 1411 | local_bh_enable(); |
2e4e6a17 | 1412 | xt_table_unlock(t); |
6b7d31fc | 1413 | module_put(t->me); |
1da177e4 LT |
1414 | free: |
1415 | vfree(paddc); | |
1416 | ||
1417 | return ret; | |
1418 | } | |
1419 | ||
3bc3fe5e PM |
1420 | #ifdef CONFIG_COMPAT |
1421 | struct compat_ip6t_replace { | |
1422 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1423 | u32 valid_hooks; | |
1424 | u32 num_entries; | |
1425 | u32 size; | |
1426 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1427 | u32 underflow[NF_INET_NUMHOOKS]; | |
1428 | u32 num_counters; | |
1429 | compat_uptr_t counters; /* struct ip6t_counters * */ | |
1430 | struct compat_ip6t_entry entries[0]; | |
1431 | }; | |
1432 | ||
1433 | static int | |
1434 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1435 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1436 | unsigned int i) |
3bc3fe5e PM |
1437 | { |
1438 | struct ip6t_entry_target *t; | |
1439 | struct compat_ip6t_entry __user *ce; | |
1440 | u_int16_t target_offset, next_offset; | |
1441 | compat_uint_t origsize; | |
dcea992a JE |
1442 | const struct xt_entry_match *ematch; |
1443 | int ret = 0; | |
3bc3fe5e | 1444 | |
3bc3fe5e PM |
1445 | origsize = *size; |
1446 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
0559518b JE |
1447 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1448 | copy_to_user(&ce->counters, &counters[i], | |
1449 | sizeof(counters[i])) != 0) | |
1450 | return -EFAULT; | |
3bc3fe5e PM |
1451 | |
1452 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1453 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1454 | ||
dcea992a JE |
1455 | xt_ematch_foreach(ematch, e) { |
1456 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1457 | if (ret != 0) | |
6bdb331b | 1458 | return ret; |
dcea992a | 1459 | } |
3bc3fe5e | 1460 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1461 | t = ip6t_get_target(e); |
1462 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1463 | if (ret) | |
0559518b | 1464 | return ret; |
3bc3fe5e | 1465 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1466 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1467 | put_user(next_offset, &ce->next_offset) != 0) | |
1468 | return -EFAULT; | |
3bc3fe5e | 1469 | return 0; |
3bc3fe5e PM |
1470 | } |
1471 | ||
022748a9 | 1472 | static int |
3bc3fe5e PM |
1473 | compat_find_calc_match(struct ip6t_entry_match *m, |
1474 | const char *name, | |
1475 | const struct ip6t_ip6 *ipv6, | |
1476 | unsigned int hookmask, | |
6bdb331b | 1477 | int *size) |
3bc3fe5e PM |
1478 | { |
1479 | struct xt_match *match; | |
1480 | ||
fd0ec0e6 JE |
1481 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
1482 | m->u.user.revision); | |
1483 | if (IS_ERR(match)) { | |
3bc3fe5e PM |
1484 | duprintf("compat_check_calc_match: `%s' not found\n", |
1485 | m->u.user.name); | |
fd0ec0e6 | 1486 | return PTR_ERR(match); |
3bc3fe5e PM |
1487 | } |
1488 | m->u.kernel.match = match; | |
1489 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1490 | return 0; |
1491 | } | |
1492 | ||
0559518b | 1493 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e PM |
1494 | { |
1495 | struct ip6t_entry_target *t; | |
dcea992a | 1496 | struct xt_entry_match *ematch; |
3bc3fe5e | 1497 | |
3bc3fe5e | 1498 | /* Cleanup all matches */ |
dcea992a | 1499 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1500 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1501 | t = compat_ip6t_get_target(e); |
1502 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1503 | } |
1504 | ||
022748a9 | 1505 | static int |
3bc3fe5e PM |
1506 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1507 | struct xt_table_info *newinfo, | |
1508 | unsigned int *size, | |
d5d1baa1 JE |
1509 | const unsigned char *base, |
1510 | const unsigned char *limit, | |
1511 | const unsigned int *hook_entries, | |
1512 | const unsigned int *underflows, | |
3bc3fe5e PM |
1513 | const char *name) |
1514 | { | |
dcea992a | 1515 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1516 | struct ip6t_entry_target *t; |
1517 | struct xt_target *target; | |
1518 | unsigned int entry_offset; | |
b0a6363c PM |
1519 | unsigned int j; |
1520 | int ret, off, h; | |
3bc3fe5e PM |
1521 | |
1522 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1523 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
1524 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
3bc3fe5e PM |
1525 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1526 | return -EINVAL; | |
1527 | } | |
1528 | ||
1529 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1530 | sizeof(struct compat_xt_entry_target)) { | |
1531 | duprintf("checking: element %p size %u\n", | |
1532 | e, e->next_offset); | |
1533 | return -EINVAL; | |
1534 | } | |
1535 | ||
1536 | /* For purposes of check_entry casting the compat entry is fine */ | |
1537 | ret = check_entry((struct ip6t_entry *)e, name); | |
1538 | if (ret) | |
1539 | return ret; | |
1540 | ||
1541 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1542 | entry_offset = (void *)e - (void *)base; | |
1543 | j = 0; | |
dcea992a JE |
1544 | xt_ematch_foreach(ematch, e) { |
1545 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1546 | &e->ipv6, e->comefrom, &off); |
dcea992a | 1547 | if (ret != 0) |
6bdb331b JE |
1548 | goto release_matches; |
1549 | ++j; | |
dcea992a | 1550 | } |
3bc3fe5e PM |
1551 | |
1552 | t = compat_ip6t_get_target(e); | |
d2a7b6ba JE |
1553 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
1554 | t->u.user.revision); | |
1555 | if (IS_ERR(target)) { | |
3bc3fe5e PM |
1556 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
1557 | t->u.user.name); | |
d2a7b6ba | 1558 | ret = PTR_ERR(target); |
3bc3fe5e PM |
1559 | goto release_matches; |
1560 | } | |
1561 | t->u.kernel.target = target; | |
1562 | ||
1563 | off += xt_compat_target_offset(target); | |
1564 | *size += off; | |
1565 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1566 | if (ret) | |
1567 | goto out; | |
1568 | ||
1569 | /* Check hooks & underflows */ | |
1570 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1571 | if ((unsigned char *)e - base == hook_entries[h]) | |
1572 | newinfo->hook_entry[h] = hook_entries[h]; | |
1573 | if ((unsigned char *)e - base == underflows[h]) | |
1574 | newinfo->underflow[h] = underflows[h]; | |
1575 | } | |
1576 | ||
1577 | /* Clear counters and comefrom */ | |
1578 | memset(&e->counters, 0, sizeof(e->counters)); | |
1579 | e->comefrom = 0; | |
3bc3fe5e PM |
1580 | return 0; |
1581 | ||
1582 | out: | |
1583 | module_put(t->u.kernel.target->me); | |
1584 | release_matches: | |
6bdb331b JE |
1585 | xt_ematch_foreach(ematch, e) { |
1586 | if (j-- == 0) | |
dcea992a | 1587 | break; |
6bdb331b JE |
1588 | module_put(ematch->u.kernel.match->me); |
1589 | } | |
3bc3fe5e PM |
1590 | return ret; |
1591 | } | |
1592 | ||
1593 | static int | |
1594 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1595 | unsigned int *size, const char *name, | |
1596 | struct xt_table_info *newinfo, unsigned char *base) | |
1597 | { | |
1598 | struct ip6t_entry_target *t; | |
1599 | struct xt_target *target; | |
1600 | struct ip6t_entry *de; | |
1601 | unsigned int origsize; | |
1602 | int ret, h; | |
dcea992a | 1603 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1604 | |
1605 | ret = 0; | |
1606 | origsize = *size; | |
1607 | de = (struct ip6t_entry *)*dstptr; | |
1608 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1609 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1610 | ||
1611 | *dstptr += sizeof(struct ip6t_entry); | |
1612 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1613 | ||
dcea992a JE |
1614 | xt_ematch_foreach(ematch, e) { |
1615 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1616 | if (ret != 0) | |
6bdb331b | 1617 | return ret; |
dcea992a | 1618 | } |
3bc3fe5e PM |
1619 | de->target_offset = e->target_offset - (origsize - *size); |
1620 | t = compat_ip6t_get_target(e); | |
1621 | target = t->u.kernel.target; | |
1622 | xt_compat_target_from_user(t, dstptr, size); | |
1623 | ||
1624 | de->next_offset = e->next_offset - (origsize - *size); | |
1625 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1626 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1627 | newinfo->hook_entry[h] -= origsize - *size; | |
1628 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1629 | newinfo->underflow[h] -= origsize - *size; | |
1630 | } | |
1631 | return ret; | |
1632 | } | |
1633 | ||
f54e9367 | 1634 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
0559518b | 1635 | const char *name) |
3bc3fe5e | 1636 | { |
b0a6363c | 1637 | unsigned int j; |
dcea992a | 1638 | int ret = 0; |
9b4fce7a | 1639 | struct xt_mtchk_param mtpar; |
dcea992a | 1640 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1641 | |
1642 | j = 0; | |
f54e9367 | 1643 | mtpar.net = net; |
9b4fce7a JE |
1644 | mtpar.table = name; |
1645 | mtpar.entryinfo = &e->ipv6; | |
1646 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1647 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 1648 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1649 | ret = check_match(ematch, &mtpar); |
dcea992a | 1650 | if (ret != 0) |
6bdb331b JE |
1651 | goto cleanup_matches; |
1652 | ++j; | |
dcea992a | 1653 | } |
3bc3fe5e | 1654 | |
add67461 | 1655 | ret = check_target(e, net, name); |
3bc3fe5e PM |
1656 | if (ret) |
1657 | goto cleanup_matches; | |
3bc3fe5e PM |
1658 | return 0; |
1659 | ||
1660 | cleanup_matches: | |
6bdb331b JE |
1661 | xt_ematch_foreach(ematch, e) { |
1662 | if (j-- == 0) | |
dcea992a | 1663 | break; |
6bdb331b JE |
1664 | cleanup_match(ematch, net); |
1665 | } | |
3bc3fe5e PM |
1666 | return ret; |
1667 | } | |
1668 | ||
1669 | static int | |
f54e9367 AD |
1670 | translate_compat_table(struct net *net, |
1671 | const char *name, | |
3bc3fe5e PM |
1672 | unsigned int valid_hooks, |
1673 | struct xt_table_info **pinfo, | |
1674 | void **pentry0, | |
1675 | unsigned int total_size, | |
1676 | unsigned int number, | |
1677 | unsigned int *hook_entries, | |
1678 | unsigned int *underflows) | |
1679 | { | |
1680 | unsigned int i, j; | |
1681 | struct xt_table_info *newinfo, *info; | |
1682 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1683 | struct compat_ip6t_entry *iter0; |
1684 | struct ip6t_entry *iter1; | |
3bc3fe5e | 1685 | unsigned int size; |
72b2b1dd | 1686 | int ret = 0; |
3bc3fe5e PM |
1687 | |
1688 | info = *pinfo; | |
1689 | entry0 = *pentry0; | |
1690 | size = total_size; | |
1691 | info->number = number; | |
1692 | ||
1693 | /* Init all hooks to impossible value. */ | |
1694 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1695 | info->hook_entry[i] = 0xFFFFFFFF; | |
1696 | info->underflow[i] = 0xFFFFFFFF; | |
1697 | } | |
1698 | ||
1699 | duprintf("translate_compat_table: size %u\n", info->size); | |
1700 | j = 0; | |
1701 | xt_compat_lock(AF_INET6); | |
1702 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
1703 | xt_entry_foreach(iter0, entry0, total_size) { |
1704 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1705 | entry0, |
1706 | entry0 + total_size, | |
1707 | hook_entries, | |
1708 | underflows, | |
1709 | name); | |
72b2b1dd | 1710 | if (ret != 0) |
0559518b JE |
1711 | goto out_unlock; |
1712 | ++j; | |
72b2b1dd | 1713 | } |
3bc3fe5e PM |
1714 | |
1715 | ret = -EINVAL; | |
1716 | if (j != number) { | |
1717 | duprintf("translate_compat_table: %u not %u entries\n", | |
1718 | j, number); | |
1719 | goto out_unlock; | |
1720 | } | |
1721 | ||
1722 | /* Check hooks all assigned */ | |
1723 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1724 | /* Only hooks which are valid */ | |
1725 | if (!(valid_hooks & (1 << i))) | |
1726 | continue; | |
1727 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1728 | duprintf("Invalid hook entry %u %u\n", | |
1729 | i, hook_entries[i]); | |
1730 | goto out_unlock; | |
1731 | } | |
1732 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1733 | duprintf("Invalid underflow %u %u\n", | |
1734 | i, underflows[i]); | |
1735 | goto out_unlock; | |
1736 | } | |
1737 | } | |
1738 | ||
1739 | ret = -ENOMEM; | |
1740 | newinfo = xt_alloc_table_info(size); | |
1741 | if (!newinfo) | |
1742 | goto out_unlock; | |
1743 | ||
1744 | newinfo->number = number; | |
1745 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1746 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1747 | newinfo->underflow[i] = info->underflow[i]; | |
1748 | } | |
1749 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1750 | pos = entry1; | |
1751 | size = total_size; | |
72b2b1dd | 1752 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1753 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1754 | name, newinfo, entry1); | |
72b2b1dd JE |
1755 | if (ret != 0) |
1756 | break; | |
1757 | } | |
3bc3fe5e PM |
1758 | xt_compat_flush_offsets(AF_INET6); |
1759 | xt_compat_unlock(AF_INET6); | |
1760 | if (ret) | |
1761 | goto free_newinfo; | |
1762 | ||
1763 | ret = -ELOOP; | |
1764 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1765 | goto free_newinfo; | |
1766 | ||
1767 | i = 0; | |
72b2b1dd | 1768 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1769 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1770 | if (ret != 0) |
1771 | break; | |
0559518b | 1772 | ++i; |
72b2b1dd | 1773 | } |
3bc3fe5e | 1774 | if (ret) { |
72b2b1dd JE |
1775 | /* |
1776 | * The first i matches need cleanup_entry (calls ->destroy) | |
1777 | * because they had called ->check already. The other j-i | |
1778 | * entries need only release. | |
1779 | */ | |
1780 | int skip = i; | |
3bc3fe5e | 1781 | j -= i; |
72b2b1dd JE |
1782 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1783 | if (skip-- > 0) | |
1784 | continue; | |
0559518b | 1785 | if (j-- == 0) |
72b2b1dd | 1786 | break; |
0559518b | 1787 | compat_release_entry(iter0); |
72b2b1dd | 1788 | } |
0559518b JE |
1789 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1790 | if (i-- == 0) | |
72b2b1dd | 1791 | break; |
0559518b JE |
1792 | cleanup_entry(iter1, net); |
1793 | } | |
3bc3fe5e PM |
1794 | xt_free_table_info(newinfo); |
1795 | return ret; | |
1796 | } | |
1797 | ||
1798 | /* And one copy for every other CPU */ | |
1799 | for_each_possible_cpu(i) | |
1800 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1801 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1802 | ||
1803 | *pinfo = newinfo; | |
1804 | *pentry0 = entry1; | |
1805 | xt_free_table_info(info); | |
1806 | return 0; | |
1807 | ||
1808 | free_newinfo: | |
1809 | xt_free_table_info(newinfo); | |
1810 | out: | |
0559518b JE |
1811 | xt_entry_foreach(iter0, entry0, total_size) { |
1812 | if (j-- == 0) | |
72b2b1dd | 1813 | break; |
0559518b JE |
1814 | compat_release_entry(iter0); |
1815 | } | |
3bc3fe5e PM |
1816 | return ret; |
1817 | out_unlock: | |
1818 | xt_compat_flush_offsets(AF_INET6); | |
1819 | xt_compat_unlock(AF_INET6); | |
1820 | goto out; | |
1821 | } | |
1822 | ||
1823 | static int | |
336b517f | 1824 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1825 | { |
1826 | int ret; | |
1827 | struct compat_ip6t_replace tmp; | |
1828 | struct xt_table_info *newinfo; | |
1829 | void *loc_cpu_entry; | |
72b2b1dd | 1830 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1831 | |
1832 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1833 | return -EFAULT; | |
1834 | ||
1835 | /* overflow check */ | |
1836 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1837 | return -ENOMEM; | |
1838 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1839 | return -ENOMEM; | |
1840 | ||
1841 | newinfo = xt_alloc_table_info(tmp.size); | |
1842 | if (!newinfo) | |
1843 | return -ENOMEM; | |
1844 | ||
9c547959 | 1845 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1846 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1847 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1848 | tmp.size) != 0) { | |
1849 | ret = -EFAULT; | |
1850 | goto free_newinfo; | |
1851 | } | |
1852 | ||
f54e9367 | 1853 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1854 | &newinfo, &loc_cpu_entry, tmp.size, |
1855 | tmp.num_entries, tmp.hook_entry, | |
1856 | tmp.underflow); | |
1857 | if (ret != 0) | |
1858 | goto free_newinfo; | |
1859 | ||
1860 | duprintf("compat_do_replace: Translated table\n"); | |
1861 | ||
336b517f | 1862 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1863 | tmp.num_counters, compat_ptr(tmp.counters)); |
1864 | if (ret) | |
1865 | goto free_newinfo_untrans; | |
1866 | return 0; | |
1867 | ||
1868 | free_newinfo_untrans: | |
72b2b1dd | 1869 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1870 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1871 | free_newinfo: |
1872 | xt_free_table_info(newinfo); | |
1873 | return ret; | |
1874 | } | |
1875 | ||
1876 | static int | |
1877 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1878 | unsigned int len) | |
1879 | { | |
1880 | int ret; | |
1881 | ||
1882 | if (!capable(CAP_NET_ADMIN)) | |
1883 | return -EPERM; | |
1884 | ||
1885 | switch (cmd) { | |
1886 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1887 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1888 | break; |
1889 | ||
1890 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1891 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1892 | break; |
1893 | ||
1894 | default: | |
1895 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1896 | ret = -EINVAL; | |
1897 | } | |
1898 | ||
1899 | return ret; | |
1900 | } | |
1901 | ||
1902 | struct compat_ip6t_get_entries { | |
1903 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1904 | compat_uint_t size; | |
1905 | struct compat_ip6t_entry entrytable[0]; | |
1906 | }; | |
1907 | ||
1908 | static int | |
1909 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1910 | void __user *userptr) | |
1911 | { | |
1912 | struct xt_counters *counters; | |
5452e425 | 1913 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1914 | void __user *pos; |
1915 | unsigned int size; | |
1916 | int ret = 0; | |
5452e425 | 1917 | const void *loc_cpu_entry; |
3bc3fe5e | 1918 | unsigned int i = 0; |
72b2b1dd | 1919 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1920 | |
1921 | counters = alloc_counters(table); | |
1922 | if (IS_ERR(counters)) | |
1923 | return PTR_ERR(counters); | |
1924 | ||
1925 | /* choose the copy that is on our node/cpu, ... | |
1926 | * This choice is lazy (because current thread is | |
1927 | * allowed to migrate to another cpu) | |
1928 | */ | |
1929 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1930 | pos = userptr; | |
1931 | size = total_size; | |
72b2b1dd JE |
1932 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1933 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1934 | &size, counters, i++); |
72b2b1dd JE |
1935 | if (ret != 0) |
1936 | break; | |
1937 | } | |
3bc3fe5e PM |
1938 | |
1939 | vfree(counters); | |
1940 | return ret; | |
1941 | } | |
1942 | ||
1943 | static int | |
336b517f AD |
1944 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1945 | int *len) | |
3bc3fe5e PM |
1946 | { |
1947 | int ret; | |
1948 | struct compat_ip6t_get_entries get; | |
1949 | struct xt_table *t; | |
1950 | ||
1951 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1952 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1953 | return -EINVAL; |
1954 | } | |
1955 | ||
1956 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1957 | return -EFAULT; | |
1958 | ||
1959 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1960 | duprintf("compat_get_entries: %u != %zu\n", |
1961 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1962 | return -EINVAL; |
1963 | } | |
1964 | ||
1965 | xt_compat_lock(AF_INET6); | |
336b517f | 1966 | t = xt_find_table_lock(net, AF_INET6, get.name); |
3bc3fe5e | 1967 | if (t && !IS_ERR(t)) { |
5452e425 | 1968 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1969 | struct xt_table_info info; |
9c547959 | 1970 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1971 | ret = compat_table_info(private, &info); |
1972 | if (!ret && get.size == info.size) { | |
1973 | ret = compat_copy_entries_to_user(private->size, | |
1974 | t, uptr->entrytable); | |
1975 | } else if (!ret) { | |
1976 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1977 | private->size, get.size); |
544473c1 | 1978 | ret = -EAGAIN; |
3bc3fe5e PM |
1979 | } |
1980 | xt_compat_flush_offsets(AF_INET6); | |
1981 | module_put(t->me); | |
1982 | xt_table_unlock(t); | |
1983 | } else | |
1984 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1985 | ||
1986 | xt_compat_unlock(AF_INET6); | |
1987 | return ret; | |
1988 | } | |
1989 | ||
1990 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
1991 | ||
1992 | static int | |
1993 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1994 | { | |
1995 | int ret; | |
1996 | ||
1997 | if (!capable(CAP_NET_ADMIN)) | |
1998 | return -EPERM; | |
1999 | ||
2000 | switch (cmd) { | |
2001 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 2002 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
2003 | break; |
2004 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 2005 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
2006 | break; |
2007 | default: | |
2008 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
2009 | } | |
2010 | return ret; | |
2011 | } | |
2012 | #endif | |
2013 | ||
1da177e4 LT |
2014 | static int |
2015 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2016 | { | |
2017 | int ret; | |
2018 | ||
2019 | if (!capable(CAP_NET_ADMIN)) | |
2020 | return -EPERM; | |
2021 | ||
2022 | switch (cmd) { | |
2023 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2024 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2025 | break; |
2026 | ||
2027 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2028 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2029 | break; |
2030 | ||
2031 | default: | |
2032 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2033 | ret = -EINVAL; | |
2034 | } | |
2035 | ||
2036 | return ret; | |
2037 | } | |
2038 | ||
2039 | static int | |
2040 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2041 | { | |
2042 | int ret; | |
2043 | ||
2044 | if (!capable(CAP_NET_ADMIN)) | |
2045 | return -EPERM; | |
2046 | ||
2047 | switch (cmd) { | |
433665c9 | 2048 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2049 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2050 | break; |
1da177e4 | 2051 | |
d924357c | 2052 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2053 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2054 | break; |
1da177e4 | 2055 | |
6b7d31fc HW |
2056 | case IP6T_SO_GET_REVISION_MATCH: |
2057 | case IP6T_SO_GET_REVISION_TARGET: { | |
2058 | struct ip6t_get_revision rev; | |
2e4e6a17 | 2059 | int target; |
6b7d31fc HW |
2060 | |
2061 | if (*len != sizeof(rev)) { | |
2062 | ret = -EINVAL; | |
2063 | break; | |
2064 | } | |
2065 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2066 | ret = -EFAULT; | |
2067 | break; | |
2068 | } | |
2069 | ||
2070 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2071 | target = 1; |
6b7d31fc | 2072 | else |
2e4e6a17 | 2073 | target = 0; |
6b7d31fc | 2074 | |
2e4e6a17 HW |
2075 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2076 | rev.revision, | |
2077 | target, &ret), | |
6b7d31fc HW |
2078 | "ip6t_%s", rev.name); |
2079 | break; | |
2080 | } | |
2081 | ||
1da177e4 LT |
2082 | default: |
2083 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2084 | ret = -EINVAL; | |
2085 | } | |
2086 | ||
2087 | return ret; | |
2088 | } | |
2089 | ||
35aad0ff JE |
2090 | struct xt_table *ip6t_register_table(struct net *net, |
2091 | const struct xt_table *table, | |
336b517f | 2092 | const struct ip6t_replace *repl) |
1da177e4 LT |
2093 | { |
2094 | int ret; | |
2e4e6a17 | 2095 | struct xt_table_info *newinfo; |
f3c5c1bf | 2096 | struct xt_table_info bootstrap = {0}; |
31836064 | 2097 | void *loc_cpu_entry; |
a98da11d | 2098 | struct xt_table *new_table; |
1da177e4 | 2099 | |
2e4e6a17 | 2100 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2101 | if (!newinfo) { |
2102 | ret = -ENOMEM; | |
2103 | goto out; | |
2104 | } | |
1da177e4 | 2105 | |
9c547959 | 2106 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2107 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2108 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2109 | |
0f234214 | 2110 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2111 | if (ret != 0) |
2112 | goto out_free; | |
1da177e4 | 2113 | |
336b517f | 2114 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2115 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2116 | ret = PTR_ERR(new_table); |
2117 | goto out_free; | |
1da177e4 | 2118 | } |
44d34e72 | 2119 | return new_table; |
1da177e4 | 2120 | |
44d34e72 AD |
2121 | out_free: |
2122 | xt_free_table_info(newinfo); | |
2123 | out: | |
2124 | return ERR_PTR(ret); | |
1da177e4 LT |
2125 | } |
2126 | ||
f54e9367 | 2127 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2128 | { |
2e4e6a17 | 2129 | struct xt_table_info *private; |
31836064 | 2130 | void *loc_cpu_entry; |
df200969 | 2131 | struct module *table_owner = table->me; |
72b2b1dd | 2132 | struct ip6t_entry *iter; |
31836064 | 2133 | |
2e4e6a17 | 2134 | private = xt_unregister_table(table); |
1da177e4 LT |
2135 | |
2136 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2137 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2138 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2139 | cleanup_entry(iter, net); |
df200969 AD |
2140 | if (private->number > private->initial_entries) |
2141 | module_put(table_owner); | |
2e4e6a17 | 2142 | xt_free_table_info(private); |
1da177e4 LT |
2143 | } |
2144 | ||
2145 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2146 | static inline bool |
1da177e4 LT |
2147 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2148 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2149 | bool invert) |
1da177e4 LT |
2150 | { |
2151 | return (type == test_type && code >= min_code && code <= max_code) | |
2152 | ^ invert; | |
2153 | } | |
2154 | ||
1d93a9cb | 2155 | static bool |
62fc8051 | 2156 | icmp6_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2157 | { |
5452e425 JE |
2158 | const struct icmp6hdr *ic; |
2159 | struct icmp6hdr _icmph; | |
f7108a20 | 2160 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2161 | |
2162 | /* Must not be a fragment. */ | |
f7108a20 | 2163 | if (par->fragoff != 0) |
1d93a9cb | 2164 | return false; |
1da177e4 | 2165 | |
f7108a20 | 2166 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2167 | if (ic == NULL) { |
2168 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2169 | * can't. Hence, no choice but to drop. |
2170 | */ | |
1da177e4 | 2171 | duprintf("Dropping evil ICMP tinygram.\n"); |
b4ba2611 | 2172 | par->hotdrop = true; |
1d93a9cb | 2173 | return false; |
1da177e4 LT |
2174 | } |
2175 | ||
2176 | return icmp6_type_code_match(icmpinfo->type, | |
2177 | icmpinfo->code[0], | |
2178 | icmpinfo->code[1], | |
2179 | ic->icmp6_type, ic->icmp6_code, | |
2180 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2181 | } | |
2182 | ||
2183 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 2184 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2185 | { |
9b4fce7a | 2186 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2187 | |
7f939713 | 2188 | /* Must specify no unknown invflags */ |
bd414ee6 | 2189 | return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2190 | } |
2191 | ||
2192 | /* The built-in targets: standard (NULL) and error. */ | |
4538506b JE |
2193 | static struct xt_target ip6t_builtin_tg[] __read_mostly = { |
2194 | { | |
2195 | .name = IP6T_STANDARD_TARGET, | |
2196 | .targetsize = sizeof(int), | |
2197 | .family = NFPROTO_IPV6, | |
3bc3fe5e | 2198 | #ifdef CONFIG_COMPAT |
4538506b JE |
2199 | .compatsize = sizeof(compat_int_t), |
2200 | .compat_from_user = compat_standard_from_user, | |
2201 | .compat_to_user = compat_standard_to_user, | |
3bc3fe5e | 2202 | #endif |
4538506b JE |
2203 | }, |
2204 | { | |
2205 | .name = IP6T_ERROR_TARGET, | |
2206 | .target = ip6t_error, | |
2207 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, | |
2208 | .family = NFPROTO_IPV6, | |
2209 | }, | |
1da177e4 LT |
2210 | }; |
2211 | ||
2212 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2213 | .pf = PF_INET6, | |
2214 | .set_optmin = IP6T_BASE_CTL, | |
2215 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2216 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2217 | #ifdef CONFIG_COMPAT |
2218 | .compat_set = compat_do_ip6t_set_ctl, | |
2219 | #endif | |
1da177e4 LT |
2220 | .get_optmin = IP6T_BASE_CTL, |
2221 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2222 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2223 | #ifdef CONFIG_COMPAT |
2224 | .compat_get = compat_do_ip6t_get_ctl, | |
2225 | #endif | |
16fcec35 | 2226 | .owner = THIS_MODULE, |
1da177e4 LT |
2227 | }; |
2228 | ||
4538506b JE |
2229 | static struct xt_match ip6t_builtin_mt[] __read_mostly = { |
2230 | { | |
2231 | .name = "icmp6", | |
2232 | .match = icmp6_match, | |
2233 | .matchsize = sizeof(struct ip6t_icmp), | |
2234 | .checkentry = icmp6_checkentry, | |
2235 | .proto = IPPROTO_ICMPV6, | |
2236 | .family = NFPROTO_IPV6, | |
2237 | }, | |
1da177e4 LT |
2238 | }; |
2239 | ||
3cb609d5 AD |
2240 | static int __net_init ip6_tables_net_init(struct net *net) |
2241 | { | |
383ca5b8 | 2242 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2243 | } |
2244 | ||
2245 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2246 | { | |
383ca5b8 | 2247 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2248 | } |
2249 | ||
2250 | static struct pernet_operations ip6_tables_net_ops = { | |
2251 | .init = ip6_tables_net_init, | |
2252 | .exit = ip6_tables_net_exit, | |
2253 | }; | |
2254 | ||
65b4b4e8 | 2255 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2256 | { |
2257 | int ret; | |
2258 | ||
3cb609d5 | 2259 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2260 | if (ret < 0) |
2261 | goto err1; | |
2e4e6a17 | 2262 | |
1da177e4 | 2263 | /* Noone else will be downing sem now, so we won't sleep */ |
4538506b | 2264 | ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 PM |
2265 | if (ret < 0) |
2266 | goto err2; | |
4538506b | 2267 | ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 PM |
2268 | if (ret < 0) |
2269 | goto err4; | |
1da177e4 LT |
2270 | |
2271 | /* Register setsockopt */ | |
2272 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2273 | if (ret < 0) |
2274 | goto err5; | |
1da177e4 | 2275 | |
ff67e4e4 | 2276 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2277 | return 0; |
0eff66e6 PM |
2278 | |
2279 | err5: | |
4538506b | 2280 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 | 2281 | err4: |
4538506b | 2282 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 | 2283 | err2: |
3cb609d5 | 2284 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2285 | err1: |
2286 | return ret; | |
1da177e4 LT |
2287 | } |
2288 | ||
65b4b4e8 | 2289 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2290 | { |
2291 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2292 | |
4538506b JE |
2293 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
2294 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); | |
3cb609d5 | 2295 | unregister_pernet_subsys(&ip6_tables_net_ops); |
1da177e4 LT |
2296 | } |
2297 | ||
e674d0f3 | 2298 | /* |
b777e0ce PM |
2299 | * find the offset to specified header or the protocol number of last header |
2300 | * if target < 0. "last header" is transport protocol header, ESP, or | |
2301 | * "No next header". | |
2302 | * | |
2303 | * If target header is found, its offset is set in *offset and return protocol | |
2304 | * number. Otherwise, return -1. | |
2305 | * | |
6d381634 PM |
2306 | * If the first fragment doesn't contain the final protocol header or |
2307 | * NEXTHDR_NONE it is considered invalid. | |
2308 | * | |
b777e0ce PM |
2309 | * Note that non-1st fragment is special case that "the protocol number |
2310 | * of last header" is "next header" field in Fragment header. In this case, | |
2311 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
2312 | * isn't NULL. | |
e674d0f3 | 2313 | * |
e674d0f3 | 2314 | */ |
b777e0ce PM |
2315 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
2316 | int target, unsigned short *fragoff) | |
e674d0f3 | 2317 | { |
6b88dd96 | 2318 | unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); |
0660e03f | 2319 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
e674d0f3 YK |
2320 | unsigned int len = skb->len - start; |
2321 | ||
b777e0ce PM |
2322 | if (fragoff) |
2323 | *fragoff = 0; | |
2324 | ||
e674d0f3 YK |
2325 | while (nexthdr != target) { |
2326 | struct ipv6_opt_hdr _hdr, *hp; | |
2327 | unsigned int hdrlen; | |
2328 | ||
b777e0ce PM |
2329 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
2330 | if (target < 0) | |
2331 | break; | |
6d381634 | 2332 | return -ENOENT; |
b777e0ce PM |
2333 | } |
2334 | ||
e674d0f3 YK |
2335 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
2336 | if (hp == NULL) | |
6d381634 | 2337 | return -EBADMSG; |
e674d0f3 | 2338 | if (nexthdr == NEXTHDR_FRAGMENT) { |
e69a4adc AV |
2339 | unsigned short _frag_off; |
2340 | __be16 *fp; | |
e674d0f3 YK |
2341 | fp = skb_header_pointer(skb, |
2342 | start+offsetof(struct frag_hdr, | |
2343 | frag_off), | |
2344 | sizeof(_frag_off), | |
2345 | &_frag_off); | |
2346 | if (fp == NULL) | |
6d381634 | 2347 | return -EBADMSG; |
e674d0f3 | 2348 | |
b777e0ce PM |
2349 | _frag_off = ntohs(*fp) & ~0x7; |
2350 | if (_frag_off) { | |
2351 | if (target < 0 && | |
2352 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
337dde79 | 2353 | hp->nexthdr == NEXTHDR_NONE)) { |
b777e0ce PM |
2354 | if (fragoff) |
2355 | *fragoff = _frag_off; | |
2356 | return hp->nexthdr; | |
2357 | } | |
6d381634 | 2358 | return -ENOENT; |
b777e0ce | 2359 | } |
e674d0f3 YK |
2360 | hdrlen = 8; |
2361 | } else if (nexthdr == NEXTHDR_AUTH) | |
1ab1457c | 2362 | hdrlen = (hp->hdrlen + 2) << 2; |
e674d0f3 | 2363 | else |
1ab1457c | 2364 | hdrlen = ipv6_optlen(hp); |
e674d0f3 YK |
2365 | |
2366 | nexthdr = hp->nexthdr; | |
2367 | len -= hdrlen; | |
2368 | start += hdrlen; | |
2369 | } | |
2370 | ||
2371 | *offset = start; | |
b777e0ce | 2372 | return nexthdr; |
e674d0f3 YK |
2373 | } |
2374 | ||
1da177e4 LT |
2375 | EXPORT_SYMBOL(ip6t_register_table); |
2376 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2377 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2378 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 2379 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 2380 | |
65b4b4e8 AM |
2381 | module_init(ip6_tables_init); |
2382 | module_exit(ip6_tables_fini); |