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 | |
43 | #define dprintf(format, args...) printk(format , ## args) | |
44 | #else | |
45 | #define dprintf(format, args...) | |
46 | #endif | |
47 | ||
48 | #ifdef DEBUG_IP_FIREWALL_USER | |
49 | #define duprintf(format, args...) printk(format , ## args) | |
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 | |
7eb35586 | 200 | ip6t_error(struct sk_buff *skb, const struct xt_target_param *par) |
1da177e4 LT |
201 | { |
202 | if (net_ratelimit()) | |
7eb35586 JE |
203 | printk("ip6_tables: error: `%s'\n", |
204 | (const char *)par->targinfo); | |
1da177e4 LT |
205 | |
206 | return NF_DROP; | |
207 | } | |
208 | ||
022748a9 DV |
209 | /* Performance critical - called for every packet */ |
210 | static inline bool | |
d5d1baa1 | 211 | do_match(const struct ip6t_entry_match *m, const struct sk_buff *skb, |
f7108a20 | 212 | struct xt_match_param *par) |
1da177e4 | 213 | { |
f7108a20 JE |
214 | par->match = m->u.kernel.match; |
215 | par->matchinfo = m->data; | |
216 | ||
1da177e4 | 217 | /* Stop iteration if it doesn't match */ |
f7108a20 | 218 | if (!m->u.kernel.match->match(skb, par)) |
1d93a9cb | 219 | return true; |
1da177e4 | 220 | else |
1d93a9cb | 221 | return false; |
1da177e4 LT |
222 | } |
223 | ||
224 | static inline struct ip6t_entry * | |
d5d1baa1 | 225 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
226 | { |
227 | return (struct ip6t_entry *)(base + offset); | |
228 | } | |
229 | ||
ba9dda3a | 230 | /* All zeroes == unconditional rule. */ |
022748a9 | 231 | /* Mildly perf critical (only if packet tracing is on) */ |
47901dc2 | 232 | static inline bool unconditional(const struct ip6t_ip6 *ipv6) |
ba9dda3a | 233 | { |
47901dc2 | 234 | static const struct ip6t_ip6 uncond; |
ba9dda3a | 235 | |
47901dc2 | 236 | return memcmp(ipv6, &uncond, sizeof(uncond)) == 0; |
ba9dda3a JK |
237 | } |
238 | ||
d5d1baa1 JE |
239 | static inline const struct ip6t_entry_target * |
240 | ip6t_get_target_c(const struct ip6t_entry *e) | |
241 | { | |
242 | return ip6t_get_target((struct ip6t_entry *)e); | |
243 | } | |
244 | ||
ba9dda3a JK |
245 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
246 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
247 | /* This cries for unification! */ | |
022748a9 | 248 | static const char *const hooknames[] = { |
6e23ae2a PM |
249 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
250 | [NF_INET_LOCAL_IN] = "INPUT", | |
251 | [NF_INET_FORWARD] = "FORWARD", | |
252 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
253 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
254 | }; |
255 | ||
256 | enum nf_ip_trace_comments { | |
257 | NF_IP6_TRACE_COMMENT_RULE, | |
258 | NF_IP6_TRACE_COMMENT_RETURN, | |
259 | NF_IP6_TRACE_COMMENT_POLICY, | |
260 | }; | |
261 | ||
022748a9 | 262 | static const char *const comments[] = { |
ba9dda3a JK |
263 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
264 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
265 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
266 | }; | |
267 | ||
268 | static struct nf_loginfo trace_loginfo = { | |
269 | .type = NF_LOG_TYPE_LOG, | |
270 | .u = { | |
271 | .log = { | |
272 | .level = 4, | |
273 | .logflags = NF_LOG_MASK, | |
274 | }, | |
275 | }, | |
276 | }; | |
277 | ||
022748a9 | 278 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 279 | static inline int |
d5d1baa1 | 280 | get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e, |
4f2f6f23 JE |
281 | const char *hookname, const char **chainname, |
282 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 283 | { |
d5d1baa1 | 284 | const struct ip6t_standard_target *t = (void *)ip6t_get_target_c(s); |
ba9dda3a JK |
285 | |
286 | if (strcmp(t->target.u.kernel.target->name, IP6T_ERROR_TARGET) == 0) { | |
287 | /* Head of user chain: ERROR target with chainname */ | |
288 | *chainname = t->target.data; | |
289 | (*rulenum) = 0; | |
290 | } else if (s == e) { | |
291 | (*rulenum)++; | |
292 | ||
3666ed1c JP |
293 | if (s->target_offset == sizeof(struct ip6t_entry) && |
294 | strcmp(t->target.u.kernel.target->name, | |
295 | IP6T_STANDARD_TARGET) == 0 && | |
296 | t->verdict < 0 && | |
297 | unconditional(&s->ipv6)) { | |
ba9dda3a JK |
298 | /* Tail of chains: STANDARD target (return/policy) */ |
299 | *comment = *chainname == hookname | |
4f2f6f23 JE |
300 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
301 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
302 | } |
303 | return 1; | |
304 | } else | |
305 | (*rulenum)++; | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
d5d1baa1 | 310 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
311 | unsigned int hook, |
312 | const struct net_device *in, | |
313 | const struct net_device *out, | |
ecb6f85e | 314 | const char *tablename, |
d5d1baa1 JE |
315 | const struct xt_table_info *private, |
316 | const struct ip6t_entry *e) | |
ba9dda3a | 317 | { |
d5d1baa1 | 318 | const void *table_base; |
5452e425 | 319 | const struct ip6t_entry *root; |
4f2f6f23 | 320 | const char *hookname, *chainname, *comment; |
72b2b1dd | 321 | const struct ip6t_entry *iter; |
ba9dda3a JK |
322 | unsigned int rulenum = 0; |
323 | ||
ccf5bd8c | 324 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
325 | root = get_entry(table_base, private->hook_entry[hook]); |
326 | ||
4f2f6f23 JE |
327 | hookname = chainname = hooknames[hook]; |
328 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; | |
ba9dda3a | 329 | |
72b2b1dd JE |
330 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
331 | if (get_chainname_rulenum(iter, e, hookname, | |
332 | &chainname, &comment, &rulenum) != 0) | |
333 | break; | |
ba9dda3a JK |
334 | |
335 | nf_log_packet(AF_INET6, hook, skb, in, out, &trace_loginfo, | |
336 | "TRACE: %s:%s:%s:%u ", | |
337 | tablename, chainname, comment, rulenum); | |
338 | } | |
339 | #endif | |
340 | ||
98e86403 JE |
341 | static inline __pure struct ip6t_entry * |
342 | ip6t_next_entry(const struct ip6t_entry *entry) | |
343 | { | |
344 | return (void *)entry + entry->next_offset; | |
345 | } | |
346 | ||
1da177e4 LT |
347 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
348 | unsigned int | |
3db05fea | 349 | ip6t_do_table(struct sk_buff *skb, |
1da177e4 LT |
350 | unsigned int hook, |
351 | const struct net_device *in, | |
352 | const struct net_device *out, | |
fe1cb108 | 353 | struct xt_table *table) |
1da177e4 | 354 | { |
bb70dfa5 JE |
355 | #define tb_comefrom ((struct ip6t_entry *)table_base)->comefrom |
356 | ||
6b7d31fc | 357 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
cff533ac | 358 | bool hotdrop = false; |
1da177e4 LT |
359 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
360 | unsigned int verdict = NF_DROP; | |
361 | const char *indev, *outdev; | |
d5d1baa1 | 362 | const void *table_base; |
1da177e4 | 363 | struct ip6t_entry *e, *back; |
d5d1baa1 | 364 | const struct xt_table_info *private; |
f7108a20 | 365 | struct xt_match_param mtpar; |
7eb35586 | 366 | struct xt_target_param tgpar; |
1da177e4 LT |
367 | |
368 | /* Initialization */ | |
369 | indev = in ? in->name : nulldevname; | |
370 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
371 | /* We handle fragments by dealing with the first fragment as |
372 | * if it was a normal packet. All other fragments are treated | |
373 | * normally, except that they will NEVER match rules that ask | |
374 | * things we don't know, ie. tcp syn flag or ports). If the | |
375 | * rule is also a fragment-specific rule, non-fragments won't | |
376 | * match it. */ | |
f7108a20 | 377 | mtpar.hotdrop = &hotdrop; |
7eb35586 JE |
378 | mtpar.in = tgpar.in = in; |
379 | mtpar.out = tgpar.out = out; | |
916a917d | 380 | mtpar.family = tgpar.family = NFPROTO_IPV6; |
a5e78820 | 381 | mtpar.hooknum = tgpar.hooknum = hook; |
1da177e4 | 382 | |
1da177e4 | 383 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
78454473 | 384 | |
942e4a2b SH |
385 | xt_info_rdlock_bh(); |
386 | private = table->private; | |
387 | table_base = private->entries[smp_processor_id()]; | |
78454473 | 388 | |
2e4e6a17 | 389 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 390 | |
1da177e4 | 391 | /* For return from builtin chain */ |
2e4e6a17 | 392 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
393 | |
394 | do { | |
d5d1baa1 | 395 | const struct ip6t_entry_target *t; |
dcea992a | 396 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 397 | |
1da177e4 LT |
398 | IP_NF_ASSERT(e); |
399 | IP_NF_ASSERT(back); | |
a1ff4ac8 | 400 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
dcea992a JE |
401 | &mtpar.thoff, &mtpar.fragoff, &hotdrop)) { |
402 | no_match: | |
a1ff4ac8 JE |
403 | e = ip6t_next_entry(e); |
404 | continue; | |
405 | } | |
1da177e4 | 406 | |
dcea992a JE |
407 | xt_ematch_foreach(ematch, e) |
408 | if (do_match(ematch, skb, &mtpar) != 0) | |
409 | goto no_match; | |
410 | ||
a1ff4ac8 JE |
411 | ADD_COUNTER(e->counters, |
412 | ntohs(ipv6_hdr(skb)->payload_len) + | |
413 | sizeof(struct ipv6hdr), 1); | |
1da177e4 | 414 | |
d5d1baa1 | 415 | t = ip6t_get_target_c(e); |
a1ff4ac8 | 416 | IP_NF_ASSERT(t->u.kernel.target); |
ba9dda3a JK |
417 | |
418 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
419 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
a1ff4ac8 JE |
420 | /* The packet is traced: log it */ |
421 | if (unlikely(skb->nf_trace)) | |
422 | trace_packet(skb, hook, in, out, | |
423 | table->name, private, e); | |
ba9dda3a | 424 | #endif |
a1ff4ac8 JE |
425 | /* Standard target? */ |
426 | if (!t->u.kernel.target->target) { | |
427 | int v; | |
428 | ||
429 | v = ((struct ip6t_standard_target *)t)->verdict; | |
430 | if (v < 0) { | |
431 | /* Pop from stack? */ | |
432 | if (v != IP6T_RETURN) { | |
433 | verdict = (unsigned)(-v) - 1; | |
434 | break; | |
1da177e4 | 435 | } |
a1ff4ac8 JE |
436 | e = back; |
437 | back = get_entry(table_base, back->comefrom); | |
438 | continue; | |
439 | } | |
3666ed1c JP |
440 | if (table_base + v != ip6t_next_entry(e) && |
441 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
a1ff4ac8 JE |
442 | /* Save old back ptr in next entry */ |
443 | struct ip6t_entry *next = ip6t_next_entry(e); | |
444 | next->comefrom = (void *)back - table_base; | |
445 | /* set back pointer to next entry */ | |
446 | back = next; | |
447 | } | |
1da177e4 | 448 | |
a1ff4ac8 | 449 | e = get_entry(table_base, v); |
7a6b1c46 JE |
450 | continue; |
451 | } | |
452 | ||
453 | /* Targets which reenter must return | |
454 | abs. verdicts */ | |
455 | tgpar.target = t->u.kernel.target; | |
456 | tgpar.targinfo = t->data; | |
7eb35586 | 457 | |
1da177e4 | 458 | #ifdef CONFIG_NETFILTER_DEBUG |
bb70dfa5 | 459 | tb_comefrom = 0xeeeeeeec; |
1da177e4 | 460 | #endif |
7a6b1c46 | 461 | verdict = t->u.kernel.target->target(skb, &tgpar); |
1da177e4 LT |
462 | |
463 | #ifdef CONFIG_NETFILTER_DEBUG | |
bb70dfa5 | 464 | if (tb_comefrom != 0xeeeeeeec && verdict == IP6T_CONTINUE) { |
7a6b1c46 JE |
465 | printk("Target %s reentered!\n", |
466 | t->u.kernel.target->name); | |
467 | verdict = NF_DROP; | |
1da177e4 | 468 | } |
bb70dfa5 | 469 | tb_comefrom = 0x57acc001; |
7a6b1c46 JE |
470 | #endif |
471 | if (verdict == IP6T_CONTINUE) | |
472 | e = ip6t_next_entry(e); | |
473 | else | |
474 | /* Verdict */ | |
475 | break; | |
1da177e4 LT |
476 | } while (!hotdrop); |
477 | ||
478 | #ifdef CONFIG_NETFILTER_DEBUG | |
bb70dfa5 | 479 | tb_comefrom = NETFILTER_LINK_POISON; |
1da177e4 | 480 | #endif |
942e4a2b | 481 | xt_info_rdunlock_bh(); |
1da177e4 LT |
482 | |
483 | #ifdef DEBUG_ALLOW_ALL | |
484 | return NF_ACCEPT; | |
485 | #else | |
486 | if (hotdrop) | |
487 | return NF_DROP; | |
488 | else return verdict; | |
489 | #endif | |
bb70dfa5 JE |
490 | |
491 | #undef tb_comefrom | |
1da177e4 LT |
492 | } |
493 | ||
1da177e4 LT |
494 | /* Figures out from what hook each rule can be called: returns 0 if |
495 | there are loops. Puts hook bitmask in comefrom. */ | |
496 | static int | |
d5d1baa1 | 497 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 498 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
499 | { |
500 | unsigned int hook; | |
501 | ||
502 | /* No recursion; use packet counter to save back ptrs (reset | |
503 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 504 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 505 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 506 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
507 | |
508 | if (!(valid_hooks & (1 << hook))) | |
509 | continue; | |
510 | ||
511 | /* Set initial back pointer. */ | |
512 | e->counters.pcnt = pos; | |
513 | ||
514 | for (;;) { | |
d5d1baa1 JE |
515 | const struct ip6t_standard_target *t |
516 | = (void *)ip6t_get_target_c(e); | |
9c547959 | 517 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 518 | |
6e23ae2a | 519 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
520 | printk("iptables: loop hook %u pos %u %08X.\n", |
521 | hook, pos, e->comefrom); | |
522 | return 0; | |
523 | } | |
9c547959 | 524 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
525 | |
526 | /* Unconditional return/END. */ | |
3666ed1c JP |
527 | if ((e->target_offset == sizeof(struct ip6t_entry) && |
528 | (strcmp(t->target.u.user.name, | |
529 | IP6T_STANDARD_TARGET) == 0) && | |
530 | t->verdict < 0 && | |
531 | unconditional(&e->ipv6)) || visited) { | |
1da177e4 LT |
532 | unsigned int oldpos, size; |
533 | ||
1f9352ae PM |
534 | if ((strcmp(t->target.u.user.name, |
535 | IP6T_STANDARD_TARGET) == 0) && | |
536 | t->verdict < -NF_MAX_VERDICT - 1) { | |
74c9c0c1 DM |
537 | duprintf("mark_source_chains: bad " |
538 | "negative verdict (%i)\n", | |
539 | t->verdict); | |
540 | return 0; | |
541 | } | |
542 | ||
1da177e4 LT |
543 | /* Return: backtrack through the last |
544 | big jump. */ | |
545 | do { | |
6e23ae2a | 546 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
547 | #ifdef DEBUG_IP_FIREWALL_USER |
548 | if (e->comefrom | |
6e23ae2a | 549 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
550 | duprintf("Back unset " |
551 | "on hook %u " | |
552 | "rule %u\n", | |
553 | hook, pos); | |
554 | } | |
555 | #endif | |
556 | oldpos = pos; | |
557 | pos = e->counters.pcnt; | |
558 | e->counters.pcnt = 0; | |
559 | ||
560 | /* We're at the start. */ | |
561 | if (pos == oldpos) | |
562 | goto next; | |
563 | ||
564 | e = (struct ip6t_entry *) | |
31836064 | 565 | (entry0 + pos); |
1da177e4 LT |
566 | } while (oldpos == pos + e->next_offset); |
567 | ||
568 | /* Move along one */ | |
569 | size = e->next_offset; | |
570 | e = (struct ip6t_entry *) | |
31836064 | 571 | (entry0 + pos + size); |
1da177e4 LT |
572 | e->counters.pcnt = pos; |
573 | pos += size; | |
574 | } else { | |
575 | int newpos = t->verdict; | |
576 | ||
577 | if (strcmp(t->target.u.user.name, | |
3666ed1c JP |
578 | IP6T_STANDARD_TARGET) == 0 && |
579 | newpos >= 0) { | |
74c9c0c1 DM |
580 | if (newpos > newinfo->size - |
581 | sizeof(struct ip6t_entry)) { | |
582 | duprintf("mark_source_chains: " | |
583 | "bad verdict (%i)\n", | |
584 | newpos); | |
585 | return 0; | |
586 | } | |
1da177e4 LT |
587 | /* This a jump; chase it. */ |
588 | duprintf("Jump rule %u -> %u\n", | |
589 | pos, newpos); | |
590 | } else { | |
591 | /* ... this is a fallthru */ | |
592 | newpos = pos + e->next_offset; | |
593 | } | |
594 | e = (struct ip6t_entry *) | |
31836064 | 595 | (entry0 + newpos); |
1da177e4 LT |
596 | e->counters.pcnt = pos; |
597 | pos = newpos; | |
598 | } | |
599 | } | |
600 | next: | |
601 | duprintf("Finished chain %u\n", hook); | |
602 | } | |
603 | return 1; | |
604 | } | |
605 | ||
6bdb331b | 606 | static void cleanup_match(struct ip6t_entry_match *m, struct net *net) |
1da177e4 | 607 | { |
6be3d859 JE |
608 | struct xt_mtdtor_param par; |
609 | ||
f54e9367 | 610 | par.net = net; |
6be3d859 JE |
611 | par.match = m->u.kernel.match; |
612 | par.matchinfo = m->data; | |
916a917d | 613 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
614 | if (par.match->destroy != NULL) |
615 | par.match->destroy(&par); | |
616 | module_put(par.match->me); | |
1da177e4 LT |
617 | } |
618 | ||
022748a9 | 619 | static int |
d5d1baa1 | 620 | check_entry(const struct ip6t_entry *e, const char *name) |
f173c8a1 | 621 | { |
d5d1baa1 | 622 | const struct ip6t_entry_target *t; |
f173c8a1 PM |
623 | |
624 | if (!ip6_checkentry(&e->ipv6)) { | |
625 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
626 | return -EINVAL; | |
627 | } | |
628 | ||
629 | if (e->target_offset + sizeof(struct ip6t_entry_target) > | |
630 | e->next_offset) | |
631 | return -EINVAL; | |
632 | ||
d5d1baa1 | 633 | t = ip6t_get_target_c(e); |
f173c8a1 PM |
634 | if (e->target_offset + t->u.target_size > e->next_offset) |
635 | return -EINVAL; | |
636 | ||
637 | return 0; | |
638 | } | |
639 | ||
6bdb331b | 640 | static int check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par) |
f173c8a1 | 641 | { |
9b4fce7a | 642 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
643 | int ret; |
644 | ||
9b4fce7a JE |
645 | par->match = m->u.kernel.match; |
646 | par->matchinfo = m->data; | |
647 | ||
916a917d | 648 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 649 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
367c6790 | 650 | if (ret < 0) { |
f173c8a1 | 651 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 652 | par.match->name); |
367c6790 | 653 | return ret; |
f173c8a1 | 654 | } |
367c6790 | 655 | return 0; |
f173c8a1 PM |
656 | } |
657 | ||
022748a9 | 658 | static int |
6bdb331b | 659 | find_check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 660 | { |
6709dbbb | 661 | struct xt_match *match; |
3cdc7c95 | 662 | int ret; |
1da177e4 | 663 | |
2e4e6a17 | 664 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, |
9c547959 | 665 | m->u.user.revision), |
6b7d31fc HW |
666 | "ip6t_%s", m->u.user.name); |
667 | if (IS_ERR(match) || !match) { | |
f173c8a1 | 668 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
6b7d31fc | 669 | return match ? PTR_ERR(match) : -ENOENT; |
1da177e4 LT |
670 | } |
671 | m->u.kernel.match = match; | |
1da177e4 | 672 | |
6bdb331b | 673 | ret = check_match(m, par); |
3cdc7c95 PM |
674 | if (ret) |
675 | goto err; | |
676 | ||
1da177e4 | 677 | return 0; |
3cdc7c95 PM |
678 | err: |
679 | module_put(m->u.kernel.match->me); | |
680 | return ret; | |
1da177e4 LT |
681 | } |
682 | ||
add67461 | 683 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 684 | { |
af5d6dc2 JE |
685 | struct ip6t_entry_target *t = ip6t_get_target(e); |
686 | struct xt_tgchk_param par = { | |
add67461 | 687 | .net = net, |
af5d6dc2 JE |
688 | .table = name, |
689 | .entryinfo = e, | |
690 | .target = t->u.kernel.target, | |
691 | .targinfo = t->data, | |
692 | .hook_mask = e->comefrom, | |
916a917d | 693 | .family = NFPROTO_IPV6, |
af5d6dc2 | 694 | }; |
1da177e4 | 695 | int ret; |
1da177e4 | 696 | |
f173c8a1 | 697 | t = ip6t_get_target(e); |
916a917d | 698 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 699 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
367c6790 | 700 | if (ret < 0) { |
f173c8a1 PM |
701 | duprintf("ip_tables: check failed for `%s'.\n", |
702 | t->u.kernel.target->name); | |
367c6790 | 703 | return ret; |
1da177e4 | 704 | } |
367c6790 | 705 | return 0; |
f173c8a1 | 706 | } |
1da177e4 | 707 | |
022748a9 | 708 | static int |
a83d8e8d | 709 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
0559518b | 710 | unsigned int size) |
f173c8a1 PM |
711 | { |
712 | struct ip6t_entry_target *t; | |
713 | struct xt_target *target; | |
714 | int ret; | |
715 | unsigned int j; | |
9b4fce7a | 716 | struct xt_mtchk_param mtpar; |
dcea992a | 717 | struct xt_entry_match *ematch; |
f173c8a1 PM |
718 | |
719 | ret = check_entry(e, name); | |
720 | if (ret) | |
721 | return ret; | |
590bdf7f | 722 | |
1da177e4 | 723 | j = 0; |
a83d8e8d | 724 | mtpar.net = net; |
9b4fce7a JE |
725 | mtpar.table = name; |
726 | mtpar.entryinfo = &e->ipv6; | |
727 | mtpar.hook_mask = e->comefrom; | |
916a917d | 728 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 729 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 730 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 731 | if (ret != 0) |
6bdb331b JE |
732 | goto cleanup_matches; |
733 | ++j; | |
dcea992a | 734 | } |
1da177e4 LT |
735 | |
736 | t = ip6t_get_target(e); | |
2e4e6a17 HW |
737 | target = try_then_request_module(xt_find_target(AF_INET6, |
738 | t->u.user.name, | |
739 | t->u.user.revision), | |
6b7d31fc HW |
740 | "ip6t_%s", t->u.user.name); |
741 | if (IS_ERR(target) || !target) { | |
f173c8a1 | 742 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
6b7d31fc | 743 | ret = target ? PTR_ERR(target) : -ENOENT; |
1da177e4 LT |
744 | goto cleanup_matches; |
745 | } | |
746 | t->u.kernel.target = target; | |
6b7d31fc | 747 | |
add67461 | 748 | ret = check_target(e, net, name); |
3cdc7c95 PM |
749 | if (ret) |
750 | goto err; | |
1da177e4 | 751 | return 0; |
3cdc7c95 PM |
752 | err: |
753 | module_put(t->u.kernel.target->me); | |
1da177e4 | 754 | cleanup_matches: |
6bdb331b JE |
755 | xt_ematch_foreach(ematch, e) { |
756 | if (j-- == 0) | |
dcea992a | 757 | break; |
6bdb331b JE |
758 | cleanup_match(ematch, net); |
759 | } | |
1da177e4 LT |
760 | return ret; |
761 | } | |
762 | ||
d5d1baa1 | 763 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 JE |
764 | { |
765 | const struct ip6t_entry_target *t; | |
766 | unsigned int verdict; | |
767 | ||
768 | if (!unconditional(&e->ipv6)) | |
769 | return false; | |
d5d1baa1 | 770 | t = ip6t_get_target_c(e); |
e2fe35c1 JE |
771 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
772 | return false; | |
773 | verdict = ((struct ip6t_standard_target *)t)->verdict; | |
774 | verdict = -verdict - 1; | |
775 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
776 | } | |
777 | ||
022748a9 | 778 | static int |
1da177e4 | 779 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 780 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
781 | const unsigned char *base, |
782 | const unsigned char *limit, | |
1da177e4 LT |
783 | const unsigned int *hook_entries, |
784 | const unsigned int *underflows, | |
0559518b | 785 | unsigned int valid_hooks) |
1da177e4 LT |
786 | { |
787 | unsigned int h; | |
788 | ||
3666ed1c JP |
789 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
790 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
1da177e4 LT |
791 | duprintf("Bad offset %p\n", e); |
792 | return -EINVAL; | |
793 | } | |
794 | ||
795 | if (e->next_offset | |
796 | < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) { | |
797 | duprintf("checking: element %p size %u\n", | |
798 | e, e->next_offset); | |
799 | return -EINVAL; | |
800 | } | |
801 | ||
802 | /* Check hooks & underflows */ | |
6e23ae2a | 803 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
804 | if (!(valid_hooks & (1 << h))) |
805 | continue; | |
1da177e4 LT |
806 | if ((unsigned char *)e - base == hook_entries[h]) |
807 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 808 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
809 | if (!check_underflow(e)) { |
810 | pr_err("Underflows must be unconditional and " | |
811 | "use the STANDARD target with " | |
812 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
813 | return -EINVAL; |
814 | } | |
1da177e4 | 815 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 816 | } |
1da177e4 LT |
817 | } |
818 | ||
1da177e4 | 819 | /* Clear counters and comefrom */ |
2e4e6a17 | 820 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 821 | e->comefrom = 0; |
1da177e4 LT |
822 | return 0; |
823 | } | |
824 | ||
0559518b | 825 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
1da177e4 | 826 | { |
a2df1648 | 827 | struct xt_tgdtor_param par; |
1da177e4 | 828 | struct ip6t_entry_target *t; |
dcea992a | 829 | struct xt_entry_match *ematch; |
1da177e4 | 830 | |
1da177e4 | 831 | /* Cleanup all matches */ |
dcea992a | 832 | xt_ematch_foreach(ematch, e) |
6bdb331b | 833 | cleanup_match(ematch, net); |
1da177e4 | 834 | t = ip6t_get_target(e); |
a2df1648 | 835 | |
add67461 | 836 | par.net = net; |
a2df1648 JE |
837 | par.target = t->u.kernel.target; |
838 | par.targinfo = t->data; | |
916a917d | 839 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
840 | if (par.target->destroy != NULL) |
841 | par.target->destroy(&par); | |
842 | module_put(par.target->me); | |
1da177e4 LT |
843 | } |
844 | ||
845 | /* Checks and translates the user-supplied table segment (held in | |
846 | newinfo) */ | |
847 | static int | |
a83d8e8d AD |
848 | translate_table(struct net *net, |
849 | const char *name, | |
1da177e4 | 850 | unsigned int valid_hooks, |
2e4e6a17 | 851 | struct xt_table_info *newinfo, |
31836064 | 852 | void *entry0, |
1da177e4 LT |
853 | unsigned int size, |
854 | unsigned int number, | |
855 | const unsigned int *hook_entries, | |
856 | const unsigned int *underflows) | |
857 | { | |
72b2b1dd | 858 | struct ip6t_entry *iter; |
1da177e4 | 859 | unsigned int i; |
72b2b1dd | 860 | int ret = 0; |
1da177e4 LT |
861 | |
862 | newinfo->size = size; | |
863 | newinfo->number = number; | |
864 | ||
865 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 866 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
867 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
868 | newinfo->underflow[i] = 0xFFFFFFFF; | |
869 | } | |
870 | ||
871 | duprintf("translate_table: size %u\n", newinfo->size); | |
872 | i = 0; | |
873 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
874 | xt_entry_foreach(iter, entry0, newinfo->size) { |
875 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
0559518b | 876 | entry0 + size, hook_entries, underflows, valid_hooks); |
72b2b1dd | 877 | if (ret != 0) |
0559518b JE |
878 | return ret; |
879 | ++i; | |
72b2b1dd | 880 | } |
1da177e4 LT |
881 | |
882 | if (i != number) { | |
883 | duprintf("translate_table: %u not %u entries\n", | |
884 | i, number); | |
885 | return -EINVAL; | |
886 | } | |
887 | ||
888 | /* Check hooks all assigned */ | |
6e23ae2a | 889 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
890 | /* Only hooks which are valid */ |
891 | if (!(valid_hooks & (1 << i))) | |
892 | continue; | |
893 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
894 | duprintf("Invalid hook entry %u %u\n", | |
895 | i, hook_entries[i]); | |
896 | return -EINVAL; | |
897 | } | |
898 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
899 | duprintf("Invalid underflow %u %u\n", | |
900 | i, underflows[i]); | |
901 | return -EINVAL; | |
902 | } | |
903 | } | |
904 | ||
74c9c0c1 DM |
905 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
906 | return -ELOOP; | |
907 | ||
1da177e4 LT |
908 | /* Finally, each sanity check must pass */ |
909 | i = 0; | |
72b2b1dd | 910 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0559518b | 911 | ret = find_check_entry(iter, net, name, size); |
72b2b1dd JE |
912 | if (ret != 0) |
913 | break; | |
0559518b | 914 | ++i; |
72b2b1dd | 915 | } |
1da177e4 | 916 | |
74c9c0c1 | 917 | if (ret != 0) { |
0559518b JE |
918 | xt_entry_foreach(iter, entry0, newinfo->size) { |
919 | if (i-- == 0) | |
72b2b1dd | 920 | break; |
0559518b JE |
921 | cleanup_entry(iter, net); |
922 | } | |
74c9c0c1 DM |
923 | return ret; |
924 | } | |
1da177e4 LT |
925 | |
926 | /* And one copy for every other CPU */ | |
6f912042 | 927 | for_each_possible_cpu(i) { |
31836064 ED |
928 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
929 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
930 | } |
931 | ||
9c547959 | 932 | return ret; |
1da177e4 LT |
933 | } |
934 | ||
1da177e4 | 935 | static void |
2e4e6a17 HW |
936 | get_counters(const struct xt_table_info *t, |
937 | struct xt_counters counters[]) | |
1da177e4 | 938 | { |
72b2b1dd | 939 | struct ip6t_entry *iter; |
1da177e4 LT |
940 | unsigned int cpu; |
941 | unsigned int i; | |
31836064 ED |
942 | unsigned int curcpu; |
943 | ||
944 | /* Instead of clearing (by a previous call to memset()) | |
945 | * the counters and using adds, we set the counters | |
946 | * with data used by 'current' CPU | |
942e4a2b SH |
947 | * |
948 | * Bottom half has to be disabled to prevent deadlock | |
949 | * if new softirq were to run and call ipt_do_table | |
31836064 | 950 | */ |
942e4a2b SH |
951 | local_bh_disable(); |
952 | curcpu = smp_processor_id(); | |
31836064 ED |
953 | |
954 | i = 0; | |
0559518b JE |
955 | xt_entry_foreach(iter, t->entries[curcpu], t->size) { |
956 | SET_COUNTER(counters[i], iter->counters.bcnt, | |
957 | iter->counters.pcnt); | |
958 | ++i; | |
959 | } | |
1da177e4 | 960 | |
6f912042 | 961 | for_each_possible_cpu(cpu) { |
31836064 ED |
962 | if (cpu == curcpu) |
963 | continue; | |
1da177e4 | 964 | i = 0; |
942e4a2b | 965 | xt_info_wrlock(cpu); |
0559518b JE |
966 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
967 | ADD_COUNTER(counters[i], iter->counters.bcnt, | |
968 | iter->counters.pcnt); | |
969 | ++i; | |
970 | } | |
942e4a2b | 971 | xt_info_wrunlock(cpu); |
1da177e4 | 972 | } |
78454473 SH |
973 | local_bh_enable(); |
974 | } | |
975 | ||
d5d1baa1 | 976 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 977 | { |
ed1a6f5e | 978 | unsigned int countersize; |
2e4e6a17 | 979 | struct xt_counters *counters; |
d5d1baa1 | 980 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
981 | |
982 | /* We need atomic snapshot of counters: rest doesn't change | |
983 | (other than comefrom, which userspace doesn't care | |
984 | about). */ | |
2e4e6a17 | 985 | countersize = sizeof(struct xt_counters) * private->number; |
3b84e92b | 986 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
987 | |
988 | if (counters == NULL) | |
942e4a2b | 989 | return ERR_PTR(-ENOMEM); |
78454473 | 990 | |
942e4a2b | 991 | get_counters(private, counters); |
78454473 | 992 | |
49a88d18 | 993 | return counters; |
ed1a6f5e PM |
994 | } |
995 | ||
996 | static int | |
997 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 998 | const struct xt_table *table, |
ed1a6f5e PM |
999 | void __user *userptr) |
1000 | { | |
1001 | unsigned int off, num; | |
d5d1baa1 | 1002 | const struct ip6t_entry *e; |
ed1a6f5e | 1003 | struct xt_counters *counters; |
5452e425 | 1004 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 1005 | int ret = 0; |
5452e425 | 1006 | const void *loc_cpu_entry; |
ed1a6f5e PM |
1007 | |
1008 | counters = alloc_counters(table); | |
1009 | if (IS_ERR(counters)) | |
1010 | return PTR_ERR(counters); | |
1011 | ||
9c547959 PM |
1012 | /* choose the copy that is on our node/cpu, ... |
1013 | * This choice is lazy (because current thread is | |
1014 | * allowed to migrate to another cpu) | |
1015 | */ | |
2e4e6a17 | 1016 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 1017 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
1018 | ret = -EFAULT; |
1019 | goto free_counters; | |
1020 | } | |
1021 | ||
1022 | /* FIXME: use iterator macros --RR */ | |
1023 | /* ... then go back and fix counters and names */ | |
1024 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
1025 | unsigned int i; | |
5452e425 JE |
1026 | const struct ip6t_entry_match *m; |
1027 | const struct ip6t_entry_target *t; | |
1da177e4 | 1028 | |
31836064 | 1029 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
1030 | if (copy_to_user(userptr + off |
1031 | + offsetof(struct ip6t_entry, counters), | |
1032 | &counters[num], | |
1033 | sizeof(counters[num])) != 0) { | |
1034 | ret = -EFAULT; | |
1035 | goto free_counters; | |
1036 | } | |
1037 | ||
1038 | for (i = sizeof(struct ip6t_entry); | |
1039 | i < e->target_offset; | |
1040 | i += m->u.match_size) { | |
1041 | m = (void *)e + i; | |
1042 | ||
1043 | if (copy_to_user(userptr + off + i | |
1044 | + offsetof(struct ip6t_entry_match, | |
1045 | u.user.name), | |
1046 | m->u.kernel.match->name, | |
1047 | strlen(m->u.kernel.match->name)+1) | |
1048 | != 0) { | |
1049 | ret = -EFAULT; | |
1050 | goto free_counters; | |
1051 | } | |
1052 | } | |
1053 | ||
d5d1baa1 | 1054 | t = ip6t_get_target_c(e); |
1da177e4 LT |
1055 | if (copy_to_user(userptr + off + e->target_offset |
1056 | + offsetof(struct ip6t_entry_target, | |
1057 | u.user.name), | |
1058 | t->u.kernel.target->name, | |
1059 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1060 | ret = -EFAULT; | |
1061 | goto free_counters; | |
1062 | } | |
1063 | } | |
1064 | ||
1065 | free_counters: | |
1066 | vfree(counters); | |
1067 | return ret; | |
1068 | } | |
1069 | ||
3bc3fe5e | 1070 | #ifdef CONFIG_COMPAT |
739674fb | 1071 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
1072 | { |
1073 | int v = *(compat_int_t *)src; | |
1074 | ||
1075 | if (v > 0) | |
1076 | v += xt_compat_calc_jump(AF_INET6, v); | |
1077 | memcpy(dst, &v, sizeof(v)); | |
1078 | } | |
1079 | ||
739674fb | 1080 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
1081 | { |
1082 | compat_int_t cv = *(int *)src; | |
1083 | ||
1084 | if (cv > 0) | |
1085 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1086 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1087 | } | |
1088 | ||
d5d1baa1 | 1089 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 1090 | const struct xt_table_info *info, |
d5d1baa1 | 1091 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 1092 | { |
dcea992a | 1093 | const struct xt_entry_match *ematch; |
d5d1baa1 | 1094 | const struct ip6t_entry_target *t; |
3bc3fe5e PM |
1095 | unsigned int entry_offset; |
1096 | int off, i, ret; | |
1097 | ||
1098 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1099 | entry_offset = (void *)e - base; | |
dcea992a | 1100 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1101 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1102 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
1103 | off += xt_compat_target_offset(t->u.kernel.target); |
1104 | newinfo->size -= off; | |
1105 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1106 | if (ret) | |
1107 | return ret; | |
1108 | ||
1109 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1110 | if (info->hook_entry[i] && | |
1111 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1112 | newinfo->hook_entry[i] -= off; | |
1113 | if (info->underflow[i] && | |
1114 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1115 | newinfo->underflow[i] -= off; | |
1116 | } | |
1117 | return 0; | |
1118 | } | |
1119 | ||
1120 | static int compat_table_info(const struct xt_table_info *info, | |
1121 | struct xt_table_info *newinfo) | |
1122 | { | |
72b2b1dd | 1123 | struct ip6t_entry *iter; |
3bc3fe5e | 1124 | void *loc_cpu_entry; |
0559518b | 1125 | int ret; |
3bc3fe5e PM |
1126 | |
1127 | if (!newinfo || !info) | |
1128 | return -EINVAL; | |
1129 | ||
1130 | /* we dont care about newinfo->entries[] */ | |
1131 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1132 | newinfo->initial_entries = 0; | |
1133 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
72b2b1dd JE |
1134 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1135 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1136 | if (ret != 0) | |
0559518b | 1137 | return ret; |
72b2b1dd | 1138 | } |
0559518b | 1139 | return 0; |
3bc3fe5e PM |
1140 | } |
1141 | #endif | |
1142 | ||
d5d1baa1 JE |
1143 | static int get_info(struct net *net, void __user *user, |
1144 | const int *len, int compat) | |
433665c9 PM |
1145 | { |
1146 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1147 | struct xt_table *t; | |
1148 | int ret; | |
1149 | ||
1150 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1151 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1152 | sizeof(struct ip6t_getinfo)); |
1153 | return -EINVAL; | |
1154 | } | |
1155 | ||
1156 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1157 | return -EFAULT; | |
1158 | ||
1159 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; | |
3bc3fe5e PM |
1160 | #ifdef CONFIG_COMPAT |
1161 | if (compat) | |
1162 | xt_compat_lock(AF_INET6); | |
1163 | #endif | |
336b517f | 1164 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 PM |
1165 | "ip6table_%s", name); |
1166 | if (t && !IS_ERR(t)) { | |
1167 | struct ip6t_getinfo info; | |
5452e425 | 1168 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1169 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1170 | struct xt_table_info tmp; |
1171 | ||
3bc3fe5e | 1172 | if (compat) { |
3bc3fe5e PM |
1173 | ret = compat_table_info(private, &tmp); |
1174 | xt_compat_flush_offsets(AF_INET6); | |
1175 | private = &tmp; | |
1176 | } | |
1177 | #endif | |
433665c9 PM |
1178 | info.valid_hooks = t->valid_hooks; |
1179 | memcpy(info.hook_entry, private->hook_entry, | |
1180 | sizeof(info.hook_entry)); | |
1181 | memcpy(info.underflow, private->underflow, | |
1182 | sizeof(info.underflow)); | |
1183 | info.num_entries = private->number; | |
1184 | info.size = private->size; | |
b5dd674b | 1185 | strcpy(info.name, name); |
433665c9 PM |
1186 | |
1187 | if (copy_to_user(user, &info, *len) != 0) | |
1188 | ret = -EFAULT; | |
1189 | else | |
1190 | ret = 0; | |
1191 | ||
1192 | xt_table_unlock(t); | |
1193 | module_put(t->me); | |
1194 | } else | |
1195 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1196 | #ifdef CONFIG_COMPAT |
1197 | if (compat) | |
1198 | xt_compat_unlock(AF_INET6); | |
1199 | #endif | |
433665c9 PM |
1200 | return ret; |
1201 | } | |
1202 | ||
1da177e4 | 1203 | static int |
d5d1baa1 JE |
1204 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
1205 | const int *len) | |
1da177e4 LT |
1206 | { |
1207 | int ret; | |
d924357c | 1208 | struct ip6t_get_entries get; |
2e4e6a17 | 1209 | struct xt_table *t; |
1da177e4 | 1210 | |
d924357c | 1211 | if (*len < sizeof(get)) { |
c9d8fe13 | 1212 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1213 | return -EINVAL; |
1214 | } | |
1215 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1216 | return -EFAULT; | |
1217 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1218 | duprintf("get_entries: %u != %zu\n", |
1219 | *len, sizeof(get) + get.size); | |
d924357c PM |
1220 | return -EINVAL; |
1221 | } | |
1222 | ||
336b517f | 1223 | t = xt_find_table_lock(net, AF_INET6, get.name); |
6b7d31fc | 1224 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
1225 | struct xt_table_info *private = t->private; |
1226 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1227 | if (get.size == private->size) |
2e4e6a17 | 1228 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1229 | t, uptr->entrytable); |
1230 | else { | |
1231 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1232 | private->size, get.size); |
544473c1 | 1233 | ret = -EAGAIN; |
1da177e4 | 1234 | } |
6b7d31fc | 1235 | module_put(t->me); |
2e4e6a17 | 1236 | xt_table_unlock(t); |
1da177e4 | 1237 | } else |
6b7d31fc | 1238 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1239 | |
1240 | return ret; | |
1241 | } | |
1242 | ||
1243 | static int | |
336b517f | 1244 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1245 | struct xt_table_info *newinfo, unsigned int num_counters, |
1246 | void __user *counters_ptr) | |
1da177e4 LT |
1247 | { |
1248 | int ret; | |
2e4e6a17 | 1249 | struct xt_table *t; |
3bc3fe5e | 1250 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1251 | struct xt_counters *counters; |
5452e425 | 1252 | const void *loc_cpu_old_entry; |
72b2b1dd | 1253 | struct ip6t_entry *iter; |
1da177e4 | 1254 | |
3bc3fe5e PM |
1255 | ret = 0; |
1256 | counters = vmalloc_node(num_counters * sizeof(struct xt_counters), | |
3b84e92b | 1257 | numa_node_id()); |
1da177e4 LT |
1258 | if (!counters) { |
1259 | ret = -ENOMEM; | |
3bc3fe5e | 1260 | goto out; |
1da177e4 | 1261 | } |
1da177e4 | 1262 | |
336b517f | 1263 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1264 | "ip6table_%s", name); |
6b7d31fc HW |
1265 | if (!t || IS_ERR(t)) { |
1266 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1267 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1268 | } |
1da177e4 LT |
1269 | |
1270 | /* You lied! */ | |
3bc3fe5e | 1271 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1272 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1273 | valid_hooks, t->valid_hooks); |
1da177e4 | 1274 | ret = -EINVAL; |
6b7d31fc | 1275 | goto put_module; |
1da177e4 LT |
1276 | } |
1277 | ||
3bc3fe5e | 1278 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1279 | if (!oldinfo) |
1280 | goto put_module; | |
1281 | ||
1282 | /* Update module usage count based on number of rules */ | |
1283 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1284 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1285 | if ((oldinfo->number > oldinfo->initial_entries) || |
1286 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1287 | module_put(t->me); |
1288 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1289 | (newinfo->number <= oldinfo->initial_entries)) | |
1290 | module_put(t->me); | |
1291 | ||
942e4a2b | 1292 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1293 | get_counters(oldinfo, counters); |
942e4a2b | 1294 | |
1da177e4 | 1295 | /* Decrease module usage counts and free resource */ |
31836064 | 1296 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
72b2b1dd | 1297 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1298 | cleanup_entry(iter, net); |
72b2b1dd | 1299 | |
2e4e6a17 | 1300 | xt_free_table_info(oldinfo); |
3bc3fe5e PM |
1301 | if (copy_to_user(counters_ptr, counters, |
1302 | sizeof(struct xt_counters) * num_counters) != 0) | |
1da177e4 LT |
1303 | ret = -EFAULT; |
1304 | vfree(counters); | |
2e4e6a17 | 1305 | xt_table_unlock(t); |
1da177e4 LT |
1306 | return ret; |
1307 | ||
1308 | put_module: | |
1309 | module_put(t->me); | |
2e4e6a17 | 1310 | xt_table_unlock(t); |
1da177e4 | 1311 | free_newinfo_counters_untrans: |
1da177e4 | 1312 | vfree(counters); |
3bc3fe5e PM |
1313 | out: |
1314 | return ret; | |
1315 | } | |
1316 | ||
1317 | static int | |
d5d1baa1 | 1318 | do_replace(struct net *net, const void __user *user, unsigned int len) |
3bc3fe5e PM |
1319 | { |
1320 | int ret; | |
1321 | struct ip6t_replace tmp; | |
1322 | struct xt_table_info *newinfo; | |
1323 | void *loc_cpu_entry; | |
72b2b1dd | 1324 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1325 | |
1326 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1327 | return -EFAULT; | |
1328 | ||
1329 | /* overflow check */ | |
1330 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1331 | return -ENOMEM; | |
1332 | ||
1333 | newinfo = xt_alloc_table_info(tmp.size); | |
1334 | if (!newinfo) | |
1335 | return -ENOMEM; | |
1336 | ||
1337 | /* choose the copy that is on our node/cpu */ | |
1338 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1339 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1340 | tmp.size) != 0) { | |
1341 | ret = -EFAULT; | |
1342 | goto free_newinfo; | |
1343 | } | |
1344 | ||
a83d8e8d | 1345 | ret = translate_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1346 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, |
1347 | tmp.hook_entry, tmp.underflow); | |
1348 | if (ret != 0) | |
1349 | goto free_newinfo; | |
1350 | ||
1351 | duprintf("ip_tables: Translated table\n"); | |
1352 | ||
336b517f | 1353 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1354 | tmp.num_counters, tmp.counters); |
1355 | if (ret) | |
1356 | goto free_newinfo_untrans; | |
1357 | return 0; | |
1358 | ||
1359 | free_newinfo_untrans: | |
72b2b1dd | 1360 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1361 | cleanup_entry(iter, net); |
1da177e4 | 1362 | free_newinfo: |
2e4e6a17 | 1363 | xt_free_table_info(newinfo); |
1da177e4 LT |
1364 | return ret; |
1365 | } | |
1366 | ||
1da177e4 | 1367 | static int |
d5d1baa1 | 1368 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
336b517f | 1369 | int compat) |
1da177e4 | 1370 | { |
942e4a2b | 1371 | unsigned int i, curcpu; |
3bc3fe5e PM |
1372 | struct xt_counters_info tmp; |
1373 | struct xt_counters *paddc; | |
1374 | unsigned int num_counters; | |
1375 | char *name; | |
1376 | int size; | |
1377 | void *ptmp; | |
2e4e6a17 | 1378 | struct xt_table *t; |
5452e425 | 1379 | const struct xt_table_info *private; |
6b7d31fc | 1380 | int ret = 0; |
5452e425 | 1381 | const void *loc_cpu_entry; |
72b2b1dd | 1382 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1383 | #ifdef CONFIG_COMPAT |
1384 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1385 | |
3bc3fe5e PM |
1386 | if (compat) { |
1387 | ptmp = &compat_tmp; | |
1388 | size = sizeof(struct compat_xt_counters_info); | |
1389 | } else | |
1390 | #endif | |
1391 | { | |
1392 | ptmp = &tmp; | |
1393 | size = sizeof(struct xt_counters_info); | |
1394 | } | |
1395 | ||
1396 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1397 | return -EFAULT; |
1398 | ||
3bc3fe5e PM |
1399 | #ifdef CONFIG_COMPAT |
1400 | if (compat) { | |
1401 | num_counters = compat_tmp.num_counters; | |
1402 | name = compat_tmp.name; | |
1403 | } else | |
1404 | #endif | |
1405 | { | |
1406 | num_counters = tmp.num_counters; | |
1407 | name = tmp.name; | |
1408 | } | |
1409 | ||
1410 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1411 | return -EINVAL; |
1412 | ||
3bc3fe5e | 1413 | paddc = vmalloc_node(len - size, numa_node_id()); |
1da177e4 LT |
1414 | if (!paddc) |
1415 | return -ENOMEM; | |
1416 | ||
3bc3fe5e | 1417 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1418 | ret = -EFAULT; |
1419 | goto free; | |
1420 | } | |
1421 | ||
336b517f | 1422 | t = xt_find_table_lock(net, AF_INET6, name); |
6b7d31fc HW |
1423 | if (!t || IS_ERR(t)) { |
1424 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1425 | goto free; |
6b7d31fc | 1426 | } |
1da177e4 | 1427 | |
942e4a2b SH |
1428 | |
1429 | local_bh_disable(); | |
2e4e6a17 | 1430 | private = t->private; |
3bc3fe5e | 1431 | if (private->number != num_counters) { |
1da177e4 LT |
1432 | ret = -EINVAL; |
1433 | goto unlock_up_free; | |
1434 | } | |
1435 | ||
1436 | i = 0; | |
31836064 | 1437 | /* Choose the copy that is on our node */ |
942e4a2b SH |
1438 | curcpu = smp_processor_id(); |
1439 | xt_info_wrlock(curcpu); | |
1440 | loc_cpu_entry = private->entries[curcpu]; | |
0559518b JE |
1441 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1442 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1443 | ++i; | |
1444 | } | |
942e4a2b SH |
1445 | xt_info_wrunlock(curcpu); |
1446 | ||
1da177e4 | 1447 | unlock_up_free: |
942e4a2b | 1448 | local_bh_enable(); |
2e4e6a17 | 1449 | xt_table_unlock(t); |
6b7d31fc | 1450 | module_put(t->me); |
1da177e4 LT |
1451 | free: |
1452 | vfree(paddc); | |
1453 | ||
1454 | return ret; | |
1455 | } | |
1456 | ||
3bc3fe5e PM |
1457 | #ifdef CONFIG_COMPAT |
1458 | struct compat_ip6t_replace { | |
1459 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1460 | u32 valid_hooks; | |
1461 | u32 num_entries; | |
1462 | u32 size; | |
1463 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1464 | u32 underflow[NF_INET_NUMHOOKS]; | |
1465 | u32 num_counters; | |
1466 | compat_uptr_t counters; /* struct ip6t_counters * */ | |
1467 | struct compat_ip6t_entry entries[0]; | |
1468 | }; | |
1469 | ||
1470 | static int | |
1471 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1472 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1473 | unsigned int i) |
3bc3fe5e PM |
1474 | { |
1475 | struct ip6t_entry_target *t; | |
1476 | struct compat_ip6t_entry __user *ce; | |
1477 | u_int16_t target_offset, next_offset; | |
1478 | compat_uint_t origsize; | |
dcea992a JE |
1479 | const struct xt_entry_match *ematch; |
1480 | int ret = 0; | |
3bc3fe5e | 1481 | |
3bc3fe5e PM |
1482 | origsize = *size; |
1483 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
0559518b JE |
1484 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1485 | copy_to_user(&ce->counters, &counters[i], | |
1486 | sizeof(counters[i])) != 0) | |
1487 | return -EFAULT; | |
3bc3fe5e PM |
1488 | |
1489 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1490 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1491 | ||
dcea992a JE |
1492 | xt_ematch_foreach(ematch, e) { |
1493 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1494 | if (ret != 0) | |
6bdb331b | 1495 | return ret; |
dcea992a | 1496 | } |
3bc3fe5e | 1497 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1498 | t = ip6t_get_target(e); |
1499 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1500 | if (ret) | |
0559518b | 1501 | return ret; |
3bc3fe5e | 1502 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1503 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1504 | put_user(next_offset, &ce->next_offset) != 0) | |
1505 | return -EFAULT; | |
3bc3fe5e | 1506 | return 0; |
3bc3fe5e PM |
1507 | } |
1508 | ||
022748a9 | 1509 | static int |
3bc3fe5e PM |
1510 | compat_find_calc_match(struct ip6t_entry_match *m, |
1511 | const char *name, | |
1512 | const struct ip6t_ip6 *ipv6, | |
1513 | unsigned int hookmask, | |
6bdb331b | 1514 | int *size) |
3bc3fe5e PM |
1515 | { |
1516 | struct xt_match *match; | |
1517 | ||
1518 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, | |
1519 | m->u.user.revision), | |
1520 | "ip6t_%s", m->u.user.name); | |
1521 | if (IS_ERR(match) || !match) { | |
1522 | duprintf("compat_check_calc_match: `%s' not found\n", | |
1523 | m->u.user.name); | |
1524 | return match ? PTR_ERR(match) : -ENOENT; | |
1525 | } | |
1526 | m->u.kernel.match = match; | |
1527 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1528 | return 0; |
1529 | } | |
1530 | ||
0559518b | 1531 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e PM |
1532 | { |
1533 | struct ip6t_entry_target *t; | |
dcea992a | 1534 | struct xt_entry_match *ematch; |
3bc3fe5e | 1535 | |
3bc3fe5e | 1536 | /* Cleanup all matches */ |
dcea992a | 1537 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1538 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1539 | t = compat_ip6t_get_target(e); |
1540 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1541 | } |
1542 | ||
022748a9 | 1543 | static int |
3bc3fe5e PM |
1544 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1545 | struct xt_table_info *newinfo, | |
1546 | unsigned int *size, | |
d5d1baa1 JE |
1547 | const unsigned char *base, |
1548 | const unsigned char *limit, | |
1549 | const unsigned int *hook_entries, | |
1550 | const unsigned int *underflows, | |
3bc3fe5e PM |
1551 | const char *name) |
1552 | { | |
dcea992a | 1553 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1554 | struct ip6t_entry_target *t; |
1555 | struct xt_target *target; | |
1556 | unsigned int entry_offset; | |
b0a6363c PM |
1557 | unsigned int j; |
1558 | int ret, off, h; | |
3bc3fe5e PM |
1559 | |
1560 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1561 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
1562 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
3bc3fe5e PM |
1563 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1564 | return -EINVAL; | |
1565 | } | |
1566 | ||
1567 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1568 | sizeof(struct compat_xt_entry_target)) { | |
1569 | duprintf("checking: element %p size %u\n", | |
1570 | e, e->next_offset); | |
1571 | return -EINVAL; | |
1572 | } | |
1573 | ||
1574 | /* For purposes of check_entry casting the compat entry is fine */ | |
1575 | ret = check_entry((struct ip6t_entry *)e, name); | |
1576 | if (ret) | |
1577 | return ret; | |
1578 | ||
1579 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1580 | entry_offset = (void *)e - (void *)base; | |
1581 | j = 0; | |
dcea992a JE |
1582 | xt_ematch_foreach(ematch, e) { |
1583 | ret = compat_find_calc_match(ematch, name, | |
6bdb331b | 1584 | &e->ipv6, e->comefrom, &off); |
dcea992a | 1585 | if (ret != 0) |
6bdb331b JE |
1586 | goto release_matches; |
1587 | ++j; | |
dcea992a | 1588 | } |
3bc3fe5e PM |
1589 | |
1590 | t = compat_ip6t_get_target(e); | |
1591 | target = try_then_request_module(xt_find_target(AF_INET6, | |
1592 | t->u.user.name, | |
1593 | t->u.user.revision), | |
1594 | "ip6t_%s", t->u.user.name); | |
1595 | if (IS_ERR(target) || !target) { | |
1596 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", | |
1597 | t->u.user.name); | |
1598 | ret = target ? PTR_ERR(target) : -ENOENT; | |
1599 | goto release_matches; | |
1600 | } | |
1601 | t->u.kernel.target = target; | |
1602 | ||
1603 | off += xt_compat_target_offset(target); | |
1604 | *size += off; | |
1605 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1606 | if (ret) | |
1607 | goto out; | |
1608 | ||
1609 | /* Check hooks & underflows */ | |
1610 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1611 | if ((unsigned char *)e - base == hook_entries[h]) | |
1612 | newinfo->hook_entry[h] = hook_entries[h]; | |
1613 | if ((unsigned char *)e - base == underflows[h]) | |
1614 | newinfo->underflow[h] = underflows[h]; | |
1615 | } | |
1616 | ||
1617 | /* Clear counters and comefrom */ | |
1618 | memset(&e->counters, 0, sizeof(e->counters)); | |
1619 | e->comefrom = 0; | |
3bc3fe5e PM |
1620 | return 0; |
1621 | ||
1622 | out: | |
1623 | module_put(t->u.kernel.target->me); | |
1624 | release_matches: | |
6bdb331b JE |
1625 | xt_ematch_foreach(ematch, e) { |
1626 | if (j-- == 0) | |
dcea992a | 1627 | break; |
6bdb331b JE |
1628 | module_put(ematch->u.kernel.match->me); |
1629 | } | |
3bc3fe5e PM |
1630 | return ret; |
1631 | } | |
1632 | ||
1633 | static int | |
1634 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1635 | unsigned int *size, const char *name, | |
1636 | struct xt_table_info *newinfo, unsigned char *base) | |
1637 | { | |
1638 | struct ip6t_entry_target *t; | |
1639 | struct xt_target *target; | |
1640 | struct ip6t_entry *de; | |
1641 | unsigned int origsize; | |
1642 | int ret, h; | |
dcea992a | 1643 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1644 | |
1645 | ret = 0; | |
1646 | origsize = *size; | |
1647 | de = (struct ip6t_entry *)*dstptr; | |
1648 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1649 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1650 | ||
1651 | *dstptr += sizeof(struct ip6t_entry); | |
1652 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1653 | ||
dcea992a JE |
1654 | xt_ematch_foreach(ematch, e) { |
1655 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1656 | if (ret != 0) | |
6bdb331b | 1657 | return ret; |
dcea992a | 1658 | } |
3bc3fe5e PM |
1659 | de->target_offset = e->target_offset - (origsize - *size); |
1660 | t = compat_ip6t_get_target(e); | |
1661 | target = t->u.kernel.target; | |
1662 | xt_compat_target_from_user(t, dstptr, size); | |
1663 | ||
1664 | de->next_offset = e->next_offset - (origsize - *size); | |
1665 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1666 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1667 | newinfo->hook_entry[h] -= origsize - *size; | |
1668 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1669 | newinfo->underflow[h] -= origsize - *size; | |
1670 | } | |
1671 | return ret; | |
1672 | } | |
1673 | ||
f54e9367 | 1674 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
0559518b | 1675 | const char *name) |
3bc3fe5e | 1676 | { |
b0a6363c | 1677 | unsigned int j; |
dcea992a | 1678 | int ret = 0; |
9b4fce7a | 1679 | struct xt_mtchk_param mtpar; |
dcea992a | 1680 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1681 | |
1682 | j = 0; | |
f54e9367 | 1683 | mtpar.net = net; |
9b4fce7a JE |
1684 | mtpar.table = name; |
1685 | mtpar.entryinfo = &e->ipv6; | |
1686 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1687 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 1688 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1689 | ret = check_match(ematch, &mtpar); |
dcea992a | 1690 | if (ret != 0) |
6bdb331b JE |
1691 | goto cleanup_matches; |
1692 | ++j; | |
dcea992a | 1693 | } |
3bc3fe5e | 1694 | |
add67461 | 1695 | ret = check_target(e, net, name); |
3bc3fe5e PM |
1696 | if (ret) |
1697 | goto cleanup_matches; | |
3bc3fe5e PM |
1698 | return 0; |
1699 | ||
1700 | cleanup_matches: | |
6bdb331b JE |
1701 | xt_ematch_foreach(ematch, e) { |
1702 | if (j-- == 0) | |
dcea992a | 1703 | break; |
6bdb331b JE |
1704 | cleanup_match(ematch, net); |
1705 | } | |
3bc3fe5e PM |
1706 | return ret; |
1707 | } | |
1708 | ||
1709 | static int | |
f54e9367 AD |
1710 | translate_compat_table(struct net *net, |
1711 | const char *name, | |
3bc3fe5e PM |
1712 | unsigned int valid_hooks, |
1713 | struct xt_table_info **pinfo, | |
1714 | void **pentry0, | |
1715 | unsigned int total_size, | |
1716 | unsigned int number, | |
1717 | unsigned int *hook_entries, | |
1718 | unsigned int *underflows) | |
1719 | { | |
1720 | unsigned int i, j; | |
1721 | struct xt_table_info *newinfo, *info; | |
1722 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1723 | struct compat_ip6t_entry *iter0; |
1724 | struct ip6t_entry *iter1; | |
3bc3fe5e | 1725 | unsigned int size; |
72b2b1dd | 1726 | int ret = 0; |
3bc3fe5e PM |
1727 | |
1728 | info = *pinfo; | |
1729 | entry0 = *pentry0; | |
1730 | size = total_size; | |
1731 | info->number = number; | |
1732 | ||
1733 | /* Init all hooks to impossible value. */ | |
1734 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1735 | info->hook_entry[i] = 0xFFFFFFFF; | |
1736 | info->underflow[i] = 0xFFFFFFFF; | |
1737 | } | |
1738 | ||
1739 | duprintf("translate_compat_table: size %u\n", info->size); | |
1740 | j = 0; | |
1741 | xt_compat_lock(AF_INET6); | |
1742 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
1743 | xt_entry_foreach(iter0, entry0, total_size) { |
1744 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
1745 | entry0, entry0 + total_size, hook_entries, underflows, | |
0559518b | 1746 | name); |
72b2b1dd | 1747 | if (ret != 0) |
0559518b JE |
1748 | goto out_unlock; |
1749 | ++j; | |
72b2b1dd | 1750 | } |
3bc3fe5e PM |
1751 | |
1752 | ret = -EINVAL; | |
1753 | if (j != number) { | |
1754 | duprintf("translate_compat_table: %u not %u entries\n", | |
1755 | j, number); | |
1756 | goto out_unlock; | |
1757 | } | |
1758 | ||
1759 | /* Check hooks all assigned */ | |
1760 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1761 | /* Only hooks which are valid */ | |
1762 | if (!(valid_hooks & (1 << i))) | |
1763 | continue; | |
1764 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1765 | duprintf("Invalid hook entry %u %u\n", | |
1766 | i, hook_entries[i]); | |
1767 | goto out_unlock; | |
1768 | } | |
1769 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1770 | duprintf("Invalid underflow %u %u\n", | |
1771 | i, underflows[i]); | |
1772 | goto out_unlock; | |
1773 | } | |
1774 | } | |
1775 | ||
1776 | ret = -ENOMEM; | |
1777 | newinfo = xt_alloc_table_info(size); | |
1778 | if (!newinfo) | |
1779 | goto out_unlock; | |
1780 | ||
1781 | newinfo->number = number; | |
1782 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1783 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1784 | newinfo->underflow[i] = info->underflow[i]; | |
1785 | } | |
1786 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1787 | pos = entry1; | |
1788 | size = total_size; | |
72b2b1dd JE |
1789 | xt_entry_foreach(iter0, entry0, total_size) { |
1790 | ret = compat_copy_entry_from_user(iter0, &pos, | |
1791 | &size, name, newinfo, entry1); | |
1792 | if (ret != 0) | |
1793 | break; | |
1794 | } | |
3bc3fe5e PM |
1795 | xt_compat_flush_offsets(AF_INET6); |
1796 | xt_compat_unlock(AF_INET6); | |
1797 | if (ret) | |
1798 | goto free_newinfo; | |
1799 | ||
1800 | ret = -ELOOP; | |
1801 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1802 | goto free_newinfo; | |
1803 | ||
1804 | i = 0; | |
72b2b1dd | 1805 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1806 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1807 | if (ret != 0) |
1808 | break; | |
0559518b | 1809 | ++i; |
72b2b1dd | 1810 | } |
3bc3fe5e | 1811 | if (ret) { |
72b2b1dd JE |
1812 | /* |
1813 | * The first i matches need cleanup_entry (calls ->destroy) | |
1814 | * because they had called ->check already. The other j-i | |
1815 | * entries need only release. | |
1816 | */ | |
1817 | int skip = i; | |
3bc3fe5e | 1818 | j -= i; |
72b2b1dd JE |
1819 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1820 | if (skip-- > 0) | |
1821 | continue; | |
0559518b | 1822 | if (j-- == 0) |
72b2b1dd | 1823 | break; |
0559518b | 1824 | compat_release_entry(iter0); |
72b2b1dd | 1825 | } |
0559518b JE |
1826 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1827 | if (i-- == 0) | |
72b2b1dd | 1828 | break; |
0559518b JE |
1829 | cleanup_entry(iter1, net); |
1830 | } | |
3bc3fe5e PM |
1831 | xt_free_table_info(newinfo); |
1832 | return ret; | |
1833 | } | |
1834 | ||
1835 | /* And one copy for every other CPU */ | |
1836 | for_each_possible_cpu(i) | |
1837 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1838 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1839 | ||
1840 | *pinfo = newinfo; | |
1841 | *pentry0 = entry1; | |
1842 | xt_free_table_info(info); | |
1843 | return 0; | |
1844 | ||
1845 | free_newinfo: | |
1846 | xt_free_table_info(newinfo); | |
1847 | out: | |
0559518b JE |
1848 | xt_entry_foreach(iter0, entry0, total_size) { |
1849 | if (j-- == 0) | |
72b2b1dd | 1850 | break; |
0559518b JE |
1851 | compat_release_entry(iter0); |
1852 | } | |
3bc3fe5e PM |
1853 | return ret; |
1854 | out_unlock: | |
1855 | xt_compat_flush_offsets(AF_INET6); | |
1856 | xt_compat_unlock(AF_INET6); | |
1857 | goto out; | |
1858 | } | |
1859 | ||
1860 | static int | |
336b517f | 1861 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1862 | { |
1863 | int ret; | |
1864 | struct compat_ip6t_replace tmp; | |
1865 | struct xt_table_info *newinfo; | |
1866 | void *loc_cpu_entry; | |
72b2b1dd | 1867 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1868 | |
1869 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1870 | return -EFAULT; | |
1871 | ||
1872 | /* overflow check */ | |
1873 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1874 | return -ENOMEM; | |
1875 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1876 | return -ENOMEM; | |
1877 | ||
1878 | newinfo = xt_alloc_table_info(tmp.size); | |
1879 | if (!newinfo) | |
1880 | return -ENOMEM; | |
1881 | ||
9c547959 | 1882 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1883 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1884 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1885 | tmp.size) != 0) { | |
1886 | ret = -EFAULT; | |
1887 | goto free_newinfo; | |
1888 | } | |
1889 | ||
f54e9367 | 1890 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1891 | &newinfo, &loc_cpu_entry, tmp.size, |
1892 | tmp.num_entries, tmp.hook_entry, | |
1893 | tmp.underflow); | |
1894 | if (ret != 0) | |
1895 | goto free_newinfo; | |
1896 | ||
1897 | duprintf("compat_do_replace: Translated table\n"); | |
1898 | ||
336b517f | 1899 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1900 | tmp.num_counters, compat_ptr(tmp.counters)); |
1901 | if (ret) | |
1902 | goto free_newinfo_untrans; | |
1903 | return 0; | |
1904 | ||
1905 | free_newinfo_untrans: | |
72b2b1dd | 1906 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1907 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1908 | free_newinfo: |
1909 | xt_free_table_info(newinfo); | |
1910 | return ret; | |
1911 | } | |
1912 | ||
1913 | static int | |
1914 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1915 | unsigned int len) | |
1916 | { | |
1917 | int ret; | |
1918 | ||
1919 | if (!capable(CAP_NET_ADMIN)) | |
1920 | return -EPERM; | |
1921 | ||
1922 | switch (cmd) { | |
1923 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1924 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1925 | break; |
1926 | ||
1927 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1928 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1929 | break; |
1930 | ||
1931 | default: | |
1932 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1933 | ret = -EINVAL; | |
1934 | } | |
1935 | ||
1936 | return ret; | |
1937 | } | |
1938 | ||
1939 | struct compat_ip6t_get_entries { | |
1940 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1941 | compat_uint_t size; | |
1942 | struct compat_ip6t_entry entrytable[0]; | |
1943 | }; | |
1944 | ||
1945 | static int | |
1946 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1947 | void __user *userptr) | |
1948 | { | |
1949 | struct xt_counters *counters; | |
5452e425 | 1950 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1951 | void __user *pos; |
1952 | unsigned int size; | |
1953 | int ret = 0; | |
5452e425 | 1954 | const void *loc_cpu_entry; |
3bc3fe5e | 1955 | unsigned int i = 0; |
72b2b1dd | 1956 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1957 | |
1958 | counters = alloc_counters(table); | |
1959 | if (IS_ERR(counters)) | |
1960 | return PTR_ERR(counters); | |
1961 | ||
1962 | /* choose the copy that is on our node/cpu, ... | |
1963 | * This choice is lazy (because current thread is | |
1964 | * allowed to migrate to another cpu) | |
1965 | */ | |
1966 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1967 | pos = userptr; | |
1968 | size = total_size; | |
72b2b1dd JE |
1969 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1970 | ret = compat_copy_entry_to_user(iter, &pos, | |
0559518b | 1971 | &size, counters, i++); |
72b2b1dd JE |
1972 | if (ret != 0) |
1973 | break; | |
1974 | } | |
3bc3fe5e PM |
1975 | |
1976 | vfree(counters); | |
1977 | return ret; | |
1978 | } | |
1979 | ||
1980 | static int | |
336b517f AD |
1981 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1982 | int *len) | |
3bc3fe5e PM |
1983 | { |
1984 | int ret; | |
1985 | struct compat_ip6t_get_entries get; | |
1986 | struct xt_table *t; | |
1987 | ||
1988 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1989 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1990 | return -EINVAL; |
1991 | } | |
1992 | ||
1993 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1994 | return -EFAULT; | |
1995 | ||
1996 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1997 | duprintf("compat_get_entries: %u != %zu\n", |
1998 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1999 | return -EINVAL; |
2000 | } | |
2001 | ||
2002 | xt_compat_lock(AF_INET6); | |
336b517f | 2003 | t = xt_find_table_lock(net, AF_INET6, get.name); |
3bc3fe5e | 2004 | if (t && !IS_ERR(t)) { |
5452e425 | 2005 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 2006 | struct xt_table_info info; |
9c547959 | 2007 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
2008 | ret = compat_table_info(private, &info); |
2009 | if (!ret && get.size == info.size) { | |
2010 | ret = compat_copy_entries_to_user(private->size, | |
2011 | t, uptr->entrytable); | |
2012 | } else if (!ret) { | |
2013 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 2014 | private->size, get.size); |
544473c1 | 2015 | ret = -EAGAIN; |
3bc3fe5e PM |
2016 | } |
2017 | xt_compat_flush_offsets(AF_INET6); | |
2018 | module_put(t->me); | |
2019 | xt_table_unlock(t); | |
2020 | } else | |
2021 | ret = t ? PTR_ERR(t) : -ENOENT; | |
2022 | ||
2023 | xt_compat_unlock(AF_INET6); | |
2024 | return ret; | |
2025 | } | |
2026 | ||
2027 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
2028 | ||
2029 | static int | |
2030 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2031 | { | |
2032 | int ret; | |
2033 | ||
2034 | if (!capable(CAP_NET_ADMIN)) | |
2035 | return -EPERM; | |
2036 | ||
2037 | switch (cmd) { | |
2038 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 2039 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
2040 | break; |
2041 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 2042 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
2043 | break; |
2044 | default: | |
2045 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
2046 | } | |
2047 | return ret; | |
2048 | } | |
2049 | #endif | |
2050 | ||
1da177e4 LT |
2051 | static int |
2052 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2053 | { | |
2054 | int ret; | |
2055 | ||
2056 | if (!capable(CAP_NET_ADMIN)) | |
2057 | return -EPERM; | |
2058 | ||
2059 | switch (cmd) { | |
2060 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2061 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2062 | break; |
2063 | ||
2064 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2065 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2066 | break; |
2067 | ||
2068 | default: | |
2069 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2070 | ret = -EINVAL; | |
2071 | } | |
2072 | ||
2073 | return ret; | |
2074 | } | |
2075 | ||
2076 | static int | |
2077 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2078 | { | |
2079 | int ret; | |
2080 | ||
2081 | if (!capable(CAP_NET_ADMIN)) | |
2082 | return -EPERM; | |
2083 | ||
2084 | switch (cmd) { | |
433665c9 | 2085 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2086 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2087 | break; |
1da177e4 | 2088 | |
d924357c | 2089 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2090 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2091 | break; |
1da177e4 | 2092 | |
6b7d31fc HW |
2093 | case IP6T_SO_GET_REVISION_MATCH: |
2094 | case IP6T_SO_GET_REVISION_TARGET: { | |
2095 | struct ip6t_get_revision rev; | |
2e4e6a17 | 2096 | int target; |
6b7d31fc HW |
2097 | |
2098 | if (*len != sizeof(rev)) { | |
2099 | ret = -EINVAL; | |
2100 | break; | |
2101 | } | |
2102 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2103 | ret = -EFAULT; | |
2104 | break; | |
2105 | } | |
2106 | ||
2107 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2108 | target = 1; |
6b7d31fc | 2109 | else |
2e4e6a17 | 2110 | target = 0; |
6b7d31fc | 2111 | |
2e4e6a17 HW |
2112 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2113 | rev.revision, | |
2114 | target, &ret), | |
6b7d31fc HW |
2115 | "ip6t_%s", rev.name); |
2116 | break; | |
2117 | } | |
2118 | ||
1da177e4 LT |
2119 | default: |
2120 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2121 | ret = -EINVAL; | |
2122 | } | |
2123 | ||
2124 | return ret; | |
2125 | } | |
2126 | ||
35aad0ff JE |
2127 | struct xt_table *ip6t_register_table(struct net *net, |
2128 | const struct xt_table *table, | |
336b517f | 2129 | const struct ip6t_replace *repl) |
1da177e4 LT |
2130 | { |
2131 | int ret; | |
2e4e6a17 | 2132 | struct xt_table_info *newinfo; |
259d4e41 | 2133 | struct xt_table_info bootstrap |
1da177e4 | 2134 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2135 | void *loc_cpu_entry; |
a98da11d | 2136 | struct xt_table *new_table; |
1da177e4 | 2137 | |
2e4e6a17 | 2138 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2139 | if (!newinfo) { |
2140 | ret = -ENOMEM; | |
2141 | goto out; | |
2142 | } | |
1da177e4 | 2143 | |
9c547959 | 2144 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2145 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2146 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2147 | |
a83d8e8d | 2148 | ret = translate_table(net, table->name, table->valid_hooks, |
31836064 | 2149 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
2150 | repl->num_entries, |
2151 | repl->hook_entry, | |
2152 | repl->underflow); | |
44d34e72 AD |
2153 | if (ret != 0) |
2154 | goto out_free; | |
1da177e4 | 2155 | |
336b517f | 2156 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2157 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2158 | ret = PTR_ERR(new_table); |
2159 | goto out_free; | |
1da177e4 | 2160 | } |
44d34e72 | 2161 | return new_table; |
1da177e4 | 2162 | |
44d34e72 AD |
2163 | out_free: |
2164 | xt_free_table_info(newinfo); | |
2165 | out: | |
2166 | return ERR_PTR(ret); | |
1da177e4 LT |
2167 | } |
2168 | ||
f54e9367 | 2169 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2170 | { |
2e4e6a17 | 2171 | struct xt_table_info *private; |
31836064 | 2172 | void *loc_cpu_entry; |
df200969 | 2173 | struct module *table_owner = table->me; |
72b2b1dd | 2174 | struct ip6t_entry *iter; |
31836064 | 2175 | |
2e4e6a17 | 2176 | private = xt_unregister_table(table); |
1da177e4 LT |
2177 | |
2178 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2179 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2180 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2181 | cleanup_entry(iter, net); |
df200969 AD |
2182 | if (private->number > private->initial_entries) |
2183 | module_put(table_owner); | |
2e4e6a17 | 2184 | xt_free_table_info(private); |
1da177e4 LT |
2185 | } |
2186 | ||
2187 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2188 | static inline bool |
1da177e4 LT |
2189 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2190 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2191 | bool invert) |
1da177e4 LT |
2192 | { |
2193 | return (type == test_type && code >= min_code && code <= max_code) | |
2194 | ^ invert; | |
2195 | } | |
2196 | ||
1d93a9cb | 2197 | static bool |
f7108a20 | 2198 | icmp6_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2199 | { |
5452e425 JE |
2200 | const struct icmp6hdr *ic; |
2201 | struct icmp6hdr _icmph; | |
f7108a20 | 2202 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2203 | |
2204 | /* Must not be a fragment. */ | |
f7108a20 | 2205 | if (par->fragoff != 0) |
1d93a9cb | 2206 | return false; |
1da177e4 | 2207 | |
f7108a20 | 2208 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2209 | if (ic == NULL) { |
2210 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2211 | * can't. Hence, no choice but to drop. |
2212 | */ | |
1da177e4 | 2213 | duprintf("Dropping evil ICMP tinygram.\n"); |
f7108a20 | 2214 | *par->hotdrop = true; |
1d93a9cb | 2215 | return false; |
1da177e4 LT |
2216 | } |
2217 | ||
2218 | return icmp6_type_code_match(icmpinfo->type, | |
2219 | icmpinfo->code[0], | |
2220 | icmpinfo->code[1], | |
2221 | ic->icmp6_type, ic->icmp6_code, | |
2222 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2223 | } | |
2224 | ||
2225 | /* Called when user tries to insert an entry of this type. */ | |
9b4fce7a | 2226 | static bool icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2227 | { |
9b4fce7a | 2228 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2229 | |
7f939713 PM |
2230 | /* Must specify no unknown invflags */ |
2231 | return !(icmpinfo->invflags & ~IP6T_ICMP_INV); | |
1da177e4 LT |
2232 | } |
2233 | ||
2234 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2235 | static struct xt_target ip6t_standard_target __read_mostly = { |
1da177e4 | 2236 | .name = IP6T_STANDARD_TARGET, |
7f939713 | 2237 | .targetsize = sizeof(int), |
4ba351cf | 2238 | .family = NFPROTO_IPV6, |
3bc3fe5e PM |
2239 | #ifdef CONFIG_COMPAT |
2240 | .compatsize = sizeof(compat_int_t), | |
2241 | .compat_from_user = compat_standard_from_user, | |
2242 | .compat_to_user = compat_standard_to_user, | |
2243 | #endif | |
1da177e4 LT |
2244 | }; |
2245 | ||
9f15c530 | 2246 | static struct xt_target ip6t_error_target __read_mostly = { |
1da177e4 LT |
2247 | .name = IP6T_ERROR_TARGET, |
2248 | .target = ip6t_error, | |
7f939713 | 2249 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, |
4ba351cf | 2250 | .family = NFPROTO_IPV6, |
1da177e4 LT |
2251 | }; |
2252 | ||
2253 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2254 | .pf = PF_INET6, | |
2255 | .set_optmin = IP6T_BASE_CTL, | |
2256 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2257 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2258 | #ifdef CONFIG_COMPAT |
2259 | .compat_set = compat_do_ip6t_set_ctl, | |
2260 | #endif | |
1da177e4 LT |
2261 | .get_optmin = IP6T_BASE_CTL, |
2262 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2263 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2264 | #ifdef CONFIG_COMPAT |
2265 | .compat_get = compat_do_ip6t_get_ctl, | |
2266 | #endif | |
16fcec35 | 2267 | .owner = THIS_MODULE, |
1da177e4 LT |
2268 | }; |
2269 | ||
9f15c530 | 2270 | static struct xt_match icmp6_matchstruct __read_mostly = { |
1da177e4 | 2271 | .name = "icmp6", |
9c547959 | 2272 | .match = icmp6_match, |
7f939713 PM |
2273 | .matchsize = sizeof(struct ip6t_icmp), |
2274 | .checkentry = icmp6_checkentry, | |
2275 | .proto = IPPROTO_ICMPV6, | |
4ba351cf | 2276 | .family = NFPROTO_IPV6, |
1da177e4 LT |
2277 | }; |
2278 | ||
3cb609d5 AD |
2279 | static int __net_init ip6_tables_net_init(struct net *net) |
2280 | { | |
383ca5b8 | 2281 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2282 | } |
2283 | ||
2284 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2285 | { | |
383ca5b8 | 2286 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2287 | } |
2288 | ||
2289 | static struct pernet_operations ip6_tables_net_ops = { | |
2290 | .init = ip6_tables_net_init, | |
2291 | .exit = ip6_tables_net_exit, | |
2292 | }; | |
2293 | ||
65b4b4e8 | 2294 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2295 | { |
2296 | int ret; | |
2297 | ||
3cb609d5 | 2298 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2299 | if (ret < 0) |
2300 | goto err1; | |
2e4e6a17 | 2301 | |
1da177e4 | 2302 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2303 | ret = xt_register_target(&ip6t_standard_target); |
2304 | if (ret < 0) | |
2305 | goto err2; | |
2306 | ret = xt_register_target(&ip6t_error_target); | |
2307 | if (ret < 0) | |
2308 | goto err3; | |
2309 | ret = xt_register_match(&icmp6_matchstruct); | |
2310 | if (ret < 0) | |
2311 | goto err4; | |
1da177e4 LT |
2312 | |
2313 | /* Register setsockopt */ | |
2314 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2315 | if (ret < 0) |
2316 | goto err5; | |
1da177e4 | 2317 | |
a887c1c1 | 2318 | printk(KERN_INFO "ip6_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2319 | return 0; |
0eff66e6 PM |
2320 | |
2321 | err5: | |
2322 | xt_unregister_match(&icmp6_matchstruct); | |
2323 | err4: | |
2324 | xt_unregister_target(&ip6t_error_target); | |
2325 | err3: | |
2326 | xt_unregister_target(&ip6t_standard_target); | |
2327 | err2: | |
3cb609d5 | 2328 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2329 | err1: |
2330 | return ret; | |
1da177e4 LT |
2331 | } |
2332 | ||
65b4b4e8 | 2333 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2334 | { |
2335 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2336 | |
a45049c5 PNA |
2337 | xt_unregister_match(&icmp6_matchstruct); |
2338 | xt_unregister_target(&ip6t_error_target); | |
2339 | xt_unregister_target(&ip6t_standard_target); | |
3cb609d5 AD |
2340 | |
2341 | unregister_pernet_subsys(&ip6_tables_net_ops); | |
1da177e4 LT |
2342 | } |
2343 | ||
e674d0f3 | 2344 | /* |
b777e0ce PM |
2345 | * find the offset to specified header or the protocol number of last header |
2346 | * if target < 0. "last header" is transport protocol header, ESP, or | |
2347 | * "No next header". | |
2348 | * | |
2349 | * If target header is found, its offset is set in *offset and return protocol | |
2350 | * number. Otherwise, return -1. | |
2351 | * | |
6d381634 PM |
2352 | * If the first fragment doesn't contain the final protocol header or |
2353 | * NEXTHDR_NONE it is considered invalid. | |
2354 | * | |
b777e0ce PM |
2355 | * Note that non-1st fragment is special case that "the protocol number |
2356 | * of last header" is "next header" field in Fragment header. In this case, | |
2357 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
2358 | * isn't NULL. | |
e674d0f3 | 2359 | * |
e674d0f3 | 2360 | */ |
b777e0ce PM |
2361 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
2362 | int target, unsigned short *fragoff) | |
e674d0f3 | 2363 | { |
6b88dd96 | 2364 | unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); |
0660e03f | 2365 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
e674d0f3 YK |
2366 | unsigned int len = skb->len - start; |
2367 | ||
b777e0ce PM |
2368 | if (fragoff) |
2369 | *fragoff = 0; | |
2370 | ||
e674d0f3 YK |
2371 | while (nexthdr != target) { |
2372 | struct ipv6_opt_hdr _hdr, *hp; | |
2373 | unsigned int hdrlen; | |
2374 | ||
b777e0ce PM |
2375 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
2376 | if (target < 0) | |
2377 | break; | |
6d381634 | 2378 | return -ENOENT; |
b777e0ce PM |
2379 | } |
2380 | ||
e674d0f3 YK |
2381 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
2382 | if (hp == NULL) | |
6d381634 | 2383 | return -EBADMSG; |
e674d0f3 | 2384 | if (nexthdr == NEXTHDR_FRAGMENT) { |
e69a4adc AV |
2385 | unsigned short _frag_off; |
2386 | __be16 *fp; | |
e674d0f3 YK |
2387 | fp = skb_header_pointer(skb, |
2388 | start+offsetof(struct frag_hdr, | |
2389 | frag_off), | |
2390 | sizeof(_frag_off), | |
2391 | &_frag_off); | |
2392 | if (fp == NULL) | |
6d381634 | 2393 | return -EBADMSG; |
e674d0f3 | 2394 | |
b777e0ce PM |
2395 | _frag_off = ntohs(*fp) & ~0x7; |
2396 | if (_frag_off) { | |
2397 | if (target < 0 && | |
2398 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
337dde79 | 2399 | hp->nexthdr == NEXTHDR_NONE)) { |
b777e0ce PM |
2400 | if (fragoff) |
2401 | *fragoff = _frag_off; | |
2402 | return hp->nexthdr; | |
2403 | } | |
6d381634 | 2404 | return -ENOENT; |
b777e0ce | 2405 | } |
e674d0f3 YK |
2406 | hdrlen = 8; |
2407 | } else if (nexthdr == NEXTHDR_AUTH) | |
1ab1457c | 2408 | hdrlen = (hp->hdrlen + 2) << 2; |
e674d0f3 | 2409 | else |
1ab1457c | 2410 | hdrlen = ipv6_optlen(hp); |
e674d0f3 YK |
2411 | |
2412 | nexthdr = hp->nexthdr; | |
2413 | len -= hdrlen; | |
2414 | start += hdrlen; | |
2415 | } | |
2416 | ||
2417 | *offset = start; | |
b777e0ce | 2418 | return nexthdr; |
e674d0f3 YK |
2419 | } |
2420 | ||
1da177e4 LT |
2421 | EXPORT_SYMBOL(ip6t_register_table); |
2422 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2423 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2424 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 2425 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 2426 | |
65b4b4e8 AM |
2427 | module_init(ip6_tables_init); |
2428 | module_exit(ip6_tables_fini); |