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Commit | Line | Data |
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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 | |
7eb35586 | 200 | ip6t_error(struct sk_buff *skb, const struct xt_target_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 | ||
022748a9 DV |
208 | /* Performance critical - called for every packet */ |
209 | static inline bool | |
d5d1baa1 | 210 | do_match(const struct ip6t_entry_match *m, const struct sk_buff *skb, |
f7108a20 | 211 | struct xt_match_param *par) |
1da177e4 | 212 | { |
f7108a20 JE |
213 | par->match = m->u.kernel.match; |
214 | par->matchinfo = m->data; | |
215 | ||
1da177e4 | 216 | /* Stop iteration if it doesn't match */ |
f7108a20 | 217 | if (!m->u.kernel.match->match(skb, par)) |
1d93a9cb | 218 | return true; |
1da177e4 | 219 | else |
1d93a9cb | 220 | return false; |
1da177e4 LT |
221 | } |
222 | ||
223 | static inline struct ip6t_entry * | |
d5d1baa1 | 224 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
225 | { |
226 | return (struct ip6t_entry *)(base + offset); | |
227 | } | |
228 | ||
ba9dda3a | 229 | /* All zeroes == unconditional rule. */ |
022748a9 | 230 | /* Mildly perf critical (only if packet tracing is on) */ |
47901dc2 | 231 | static inline bool unconditional(const struct ip6t_ip6 *ipv6) |
ba9dda3a | 232 | { |
47901dc2 | 233 | static const struct ip6t_ip6 uncond; |
ba9dda3a | 234 | |
47901dc2 | 235 | return memcmp(ipv6, &uncond, sizeof(uncond)) == 0; |
ba9dda3a JK |
236 | } |
237 | ||
d5d1baa1 JE |
238 | static inline const struct ip6t_entry_target * |
239 | ip6t_get_target_c(const struct ip6t_entry *e) | |
240 | { | |
241 | return ip6t_get_target((struct ip6t_entry *)e); | |
242 | } | |
243 | ||
ba9dda3a JK |
244 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
245 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
246 | /* This cries for unification! */ | |
022748a9 | 247 | static const char *const hooknames[] = { |
6e23ae2a PM |
248 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
249 | [NF_INET_LOCAL_IN] = "INPUT", | |
250 | [NF_INET_FORWARD] = "FORWARD", | |
251 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
252 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
253 | }; |
254 | ||
255 | enum nf_ip_trace_comments { | |
256 | NF_IP6_TRACE_COMMENT_RULE, | |
257 | NF_IP6_TRACE_COMMENT_RETURN, | |
258 | NF_IP6_TRACE_COMMENT_POLICY, | |
259 | }; | |
260 | ||
022748a9 | 261 | static const char *const comments[] = { |
ba9dda3a JK |
262 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
263 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
264 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
265 | }; | |
266 | ||
267 | static struct nf_loginfo trace_loginfo = { | |
268 | .type = NF_LOG_TYPE_LOG, | |
269 | .u = { | |
270 | .log = { | |
271 | .level = 4, | |
272 | .logflags = NF_LOG_MASK, | |
273 | }, | |
274 | }, | |
275 | }; | |
276 | ||
022748a9 | 277 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 278 | static inline int |
d5d1baa1 | 279 | get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e, |
4f2f6f23 JE |
280 | const char *hookname, const char **chainname, |
281 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 282 | { |
d5d1baa1 | 283 | const struct ip6t_standard_target *t = (void *)ip6t_get_target_c(s); |
ba9dda3a JK |
284 | |
285 | if (strcmp(t->target.u.kernel.target->name, IP6T_ERROR_TARGET) == 0) { | |
286 | /* Head of user chain: ERROR target with chainname */ | |
287 | *chainname = t->target.data; | |
288 | (*rulenum) = 0; | |
289 | } else if (s == e) { | |
290 | (*rulenum)++; | |
291 | ||
3666ed1c JP |
292 | if (s->target_offset == sizeof(struct ip6t_entry) && |
293 | strcmp(t->target.u.kernel.target->name, | |
294 | IP6T_STANDARD_TARGET) == 0 && | |
295 | t->verdict < 0 && | |
296 | unconditional(&s->ipv6)) { | |
ba9dda3a JK |
297 | /* Tail of chains: STANDARD target (return/policy) */ |
298 | *comment = *chainname == hookname | |
4f2f6f23 JE |
299 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
300 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
301 | } |
302 | return 1; | |
303 | } else | |
304 | (*rulenum)++; | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
d5d1baa1 | 309 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
310 | unsigned int hook, |
311 | const struct net_device *in, | |
312 | const struct net_device *out, | |
ecb6f85e | 313 | const char *tablename, |
d5d1baa1 JE |
314 | const struct xt_table_info *private, |
315 | const struct ip6t_entry *e) | |
ba9dda3a | 316 | { |
d5d1baa1 | 317 | const void *table_base; |
5452e425 | 318 | const struct ip6t_entry *root; |
4f2f6f23 | 319 | const char *hookname, *chainname, *comment; |
72b2b1dd | 320 | const struct ip6t_entry *iter; |
ba9dda3a JK |
321 | unsigned int rulenum = 0; |
322 | ||
ccf5bd8c | 323 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
324 | root = get_entry(table_base, private->hook_entry[hook]); |
325 | ||
4f2f6f23 JE |
326 | hookname = chainname = hooknames[hook]; |
327 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; | |
ba9dda3a | 328 | |
72b2b1dd JE |
329 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
330 | if (get_chainname_rulenum(iter, e, hookname, | |
331 | &chainname, &comment, &rulenum) != 0) | |
332 | break; | |
ba9dda3a JK |
333 | |
334 | nf_log_packet(AF_INET6, hook, skb, in, out, &trace_loginfo, | |
335 | "TRACE: %s:%s:%s:%u ", | |
336 | tablename, chainname, comment, rulenum); | |
337 | } | |
338 | #endif | |
339 | ||
98e86403 JE |
340 | static inline __pure struct ip6t_entry * |
341 | ip6t_next_entry(const struct ip6t_entry *entry) | |
342 | { | |
343 | return (void *)entry + entry->next_offset; | |
344 | } | |
345 | ||
1da177e4 LT |
346 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
347 | unsigned int | |
3db05fea | 348 | ip6t_do_table(struct sk_buff *skb, |
1da177e4 LT |
349 | unsigned int hook, |
350 | const struct net_device *in, | |
351 | const struct net_device *out, | |
fe1cb108 | 352 | struct xt_table *table) |
1da177e4 | 353 | { |
bb70dfa5 JE |
354 | #define tb_comefrom ((struct ip6t_entry *)table_base)->comefrom |
355 | ||
6b7d31fc | 356 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
cff533ac | 357 | bool hotdrop = false; |
1da177e4 LT |
358 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
359 | unsigned int verdict = NF_DROP; | |
360 | const char *indev, *outdev; | |
d5d1baa1 | 361 | const void *table_base; |
1da177e4 | 362 | struct ip6t_entry *e, *back; |
d5d1baa1 | 363 | const struct xt_table_info *private; |
f7108a20 | 364 | struct xt_match_param mtpar; |
7eb35586 | 365 | struct xt_target_param tgpar; |
1da177e4 LT |
366 | |
367 | /* Initialization */ | |
368 | indev = in ? in->name : nulldevname; | |
369 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
370 | /* We handle fragments by dealing with the first fragment as |
371 | * if it was a normal packet. All other fragments are treated | |
372 | * normally, except that they will NEVER match rules that ask | |
373 | * things we don't know, ie. tcp syn flag or ports). If the | |
374 | * rule is also a fragment-specific rule, non-fragments won't | |
375 | * match it. */ | |
f7108a20 | 376 | mtpar.hotdrop = &hotdrop; |
7eb35586 JE |
377 | mtpar.in = tgpar.in = in; |
378 | mtpar.out = tgpar.out = out; | |
916a917d | 379 | mtpar.family = tgpar.family = NFPROTO_IPV6; |
a5e78820 | 380 | mtpar.hooknum = tgpar.hooknum = hook; |
1da177e4 | 381 | |
1da177e4 | 382 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
78454473 | 383 | |
942e4a2b SH |
384 | xt_info_rdlock_bh(); |
385 | private = table->private; | |
386 | table_base = private->entries[smp_processor_id()]; | |
78454473 | 387 | |
2e4e6a17 | 388 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 389 | |
1da177e4 | 390 | /* For return from builtin chain */ |
2e4e6a17 | 391 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
392 | |
393 | do { | |
d5d1baa1 | 394 | const struct ip6t_entry_target *t; |
dcea992a | 395 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 396 | |
1da177e4 LT |
397 | IP_NF_ASSERT(e); |
398 | IP_NF_ASSERT(back); | |
a1ff4ac8 | 399 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
dcea992a JE |
400 | &mtpar.thoff, &mtpar.fragoff, &hotdrop)) { |
401 | no_match: | |
a1ff4ac8 JE |
402 | e = ip6t_next_entry(e); |
403 | continue; | |
404 | } | |
1da177e4 | 405 | |
dcea992a JE |
406 | xt_ematch_foreach(ematch, e) |
407 | if (do_match(ematch, skb, &mtpar) != 0) | |
408 | goto no_match; | |
409 | ||
a1ff4ac8 JE |
410 | ADD_COUNTER(e->counters, |
411 | ntohs(ipv6_hdr(skb)->payload_len) + | |
412 | sizeof(struct ipv6hdr), 1); | |
1da177e4 | 413 | |
d5d1baa1 | 414 | t = ip6t_get_target_c(e); |
a1ff4ac8 | 415 | IP_NF_ASSERT(t->u.kernel.target); |
ba9dda3a JK |
416 | |
417 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
418 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
a1ff4ac8 JE |
419 | /* The packet is traced: log it */ |
420 | if (unlikely(skb->nf_trace)) | |
421 | trace_packet(skb, hook, in, out, | |
422 | table->name, private, e); | |
ba9dda3a | 423 | #endif |
a1ff4ac8 JE |
424 | /* Standard target? */ |
425 | if (!t->u.kernel.target->target) { | |
426 | int v; | |
427 | ||
428 | v = ((struct ip6t_standard_target *)t)->verdict; | |
429 | if (v < 0) { | |
430 | /* Pop from stack? */ | |
431 | if (v != IP6T_RETURN) { | |
432 | verdict = (unsigned)(-v) - 1; | |
433 | break; | |
1da177e4 | 434 | } |
a1ff4ac8 JE |
435 | e = back; |
436 | back = get_entry(table_base, back->comefrom); | |
437 | continue; | |
438 | } | |
3666ed1c JP |
439 | if (table_base + v != ip6t_next_entry(e) && |
440 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
a1ff4ac8 JE |
441 | /* Save old back ptr in next entry */ |
442 | struct ip6t_entry *next = ip6t_next_entry(e); | |
443 | next->comefrom = (void *)back - table_base; | |
444 | /* set back pointer to next entry */ | |
445 | back = next; | |
446 | } | |
1da177e4 | 447 | |
a1ff4ac8 | 448 | e = get_entry(table_base, v); |
7a6b1c46 JE |
449 | continue; |
450 | } | |
451 | ||
452 | /* Targets which reenter must return | |
453 | abs. verdicts */ | |
454 | tgpar.target = t->u.kernel.target; | |
455 | tgpar.targinfo = t->data; | |
7eb35586 | 456 | |
1da177e4 | 457 | #ifdef CONFIG_NETFILTER_DEBUG |
bb70dfa5 | 458 | tb_comefrom = 0xeeeeeeec; |
1da177e4 | 459 | #endif |
7a6b1c46 | 460 | verdict = t->u.kernel.target->target(skb, &tgpar); |
1da177e4 LT |
461 | |
462 | #ifdef CONFIG_NETFILTER_DEBUG | |
bb70dfa5 | 463 | if (tb_comefrom != 0xeeeeeeec && verdict == IP6T_CONTINUE) { |
7a6b1c46 JE |
464 | printk("Target %s reentered!\n", |
465 | t->u.kernel.target->name); | |
466 | verdict = NF_DROP; | |
1da177e4 | 467 | } |
bb70dfa5 | 468 | tb_comefrom = 0x57acc001; |
7a6b1c46 JE |
469 | #endif |
470 | if (verdict == IP6T_CONTINUE) | |
471 | e = ip6t_next_entry(e); | |
472 | else | |
473 | /* Verdict */ | |
474 | break; | |
1da177e4 LT |
475 | } while (!hotdrop); |
476 | ||
477 | #ifdef CONFIG_NETFILTER_DEBUG | |
bb70dfa5 | 478 | tb_comefrom = NETFILTER_LINK_POISON; |
1da177e4 | 479 | #endif |
942e4a2b | 480 | xt_info_rdunlock_bh(); |
1da177e4 LT |
481 | |
482 | #ifdef DEBUG_ALLOW_ALL | |
483 | return NF_ACCEPT; | |
484 | #else | |
485 | if (hotdrop) | |
486 | return NF_DROP; | |
487 | else return verdict; | |
488 | #endif | |
bb70dfa5 JE |
489 | |
490 | #undef tb_comefrom | |
1da177e4 LT |
491 | } |
492 | ||
1da177e4 LT |
493 | /* Figures out from what hook each rule can be called: returns 0 if |
494 | there are loops. Puts hook bitmask in comefrom. */ | |
495 | static int | |
d5d1baa1 | 496 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 497 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
498 | { |
499 | unsigned int hook; | |
500 | ||
501 | /* No recursion; use packet counter to save back ptrs (reset | |
502 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 503 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 504 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 505 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
506 | |
507 | if (!(valid_hooks & (1 << hook))) | |
508 | continue; | |
509 | ||
510 | /* Set initial back pointer. */ | |
511 | e->counters.pcnt = pos; | |
512 | ||
513 | for (;;) { | |
d5d1baa1 JE |
514 | const struct ip6t_standard_target *t |
515 | = (void *)ip6t_get_target_c(e); | |
9c547959 | 516 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 517 | |
6e23ae2a | 518 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
519 | printk("iptables: loop hook %u pos %u %08X.\n", |
520 | hook, pos, e->comefrom); | |
521 | return 0; | |
522 | } | |
9c547959 | 523 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
524 | |
525 | /* Unconditional return/END. */ | |
3666ed1c JP |
526 | if ((e->target_offset == sizeof(struct ip6t_entry) && |
527 | (strcmp(t->target.u.user.name, | |
528 | IP6T_STANDARD_TARGET) == 0) && | |
529 | t->verdict < 0 && | |
530 | unconditional(&e->ipv6)) || visited) { | |
1da177e4 LT |
531 | unsigned int oldpos, size; |
532 | ||
1f9352ae PM |
533 | if ((strcmp(t->target.u.user.name, |
534 | IP6T_STANDARD_TARGET) == 0) && | |
535 | t->verdict < -NF_MAX_VERDICT - 1) { | |
74c9c0c1 DM |
536 | duprintf("mark_source_chains: bad " |
537 | "negative verdict (%i)\n", | |
538 | t->verdict); | |
539 | return 0; | |
540 | } | |
541 | ||
1da177e4 LT |
542 | /* Return: backtrack through the last |
543 | big jump. */ | |
544 | do { | |
6e23ae2a | 545 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
546 | #ifdef DEBUG_IP_FIREWALL_USER |
547 | if (e->comefrom | |
6e23ae2a | 548 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
549 | duprintf("Back unset " |
550 | "on hook %u " | |
551 | "rule %u\n", | |
552 | hook, pos); | |
553 | } | |
554 | #endif | |
555 | oldpos = pos; | |
556 | pos = e->counters.pcnt; | |
557 | e->counters.pcnt = 0; | |
558 | ||
559 | /* We're at the start. */ | |
560 | if (pos == oldpos) | |
561 | goto next; | |
562 | ||
563 | e = (struct ip6t_entry *) | |
31836064 | 564 | (entry0 + pos); |
1da177e4 LT |
565 | } while (oldpos == pos + e->next_offset); |
566 | ||
567 | /* Move along one */ | |
568 | size = e->next_offset; | |
569 | e = (struct ip6t_entry *) | |
31836064 | 570 | (entry0 + pos + size); |
1da177e4 LT |
571 | e->counters.pcnt = pos; |
572 | pos += size; | |
573 | } else { | |
574 | int newpos = t->verdict; | |
575 | ||
576 | if (strcmp(t->target.u.user.name, | |
3666ed1c JP |
577 | IP6T_STANDARD_TARGET) == 0 && |
578 | newpos >= 0) { | |
74c9c0c1 DM |
579 | if (newpos > newinfo->size - |
580 | sizeof(struct ip6t_entry)) { | |
581 | duprintf("mark_source_chains: " | |
582 | "bad verdict (%i)\n", | |
583 | newpos); | |
584 | return 0; | |
585 | } | |
1da177e4 LT |
586 | /* This a jump; chase it. */ |
587 | duprintf("Jump rule %u -> %u\n", | |
588 | pos, newpos); | |
589 | } else { | |
590 | /* ... this is a fallthru */ | |
591 | newpos = pos + e->next_offset; | |
592 | } | |
593 | e = (struct ip6t_entry *) | |
31836064 | 594 | (entry0 + newpos); |
1da177e4 LT |
595 | e->counters.pcnt = pos; |
596 | pos = newpos; | |
597 | } | |
598 | } | |
599 | next: | |
600 | duprintf("Finished chain %u\n", hook); | |
601 | } | |
602 | return 1; | |
603 | } | |
604 | ||
6bdb331b | 605 | static void cleanup_match(struct ip6t_entry_match *m, struct net *net) |
1da177e4 | 606 | { |
6be3d859 JE |
607 | struct xt_mtdtor_param par; |
608 | ||
f54e9367 | 609 | par.net = net; |
6be3d859 JE |
610 | par.match = m->u.kernel.match; |
611 | par.matchinfo = m->data; | |
916a917d | 612 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
613 | if (par.match->destroy != NULL) |
614 | par.match->destroy(&par); | |
615 | module_put(par.match->me); | |
1da177e4 LT |
616 | } |
617 | ||
022748a9 | 618 | static int |
d5d1baa1 | 619 | check_entry(const struct ip6t_entry *e, const char *name) |
f173c8a1 | 620 | { |
d5d1baa1 | 621 | const struct ip6t_entry_target *t; |
f173c8a1 PM |
622 | |
623 | if (!ip6_checkentry(&e->ipv6)) { | |
624 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
625 | return -EINVAL; | |
626 | } | |
627 | ||
628 | if (e->target_offset + sizeof(struct ip6t_entry_target) > | |
629 | e->next_offset) | |
630 | return -EINVAL; | |
631 | ||
d5d1baa1 | 632 | t = ip6t_get_target_c(e); |
f173c8a1 PM |
633 | if (e->target_offset + t->u.target_size > e->next_offset) |
634 | return -EINVAL; | |
635 | ||
636 | return 0; | |
637 | } | |
638 | ||
6bdb331b | 639 | static int check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par) |
f173c8a1 | 640 | { |
9b4fce7a | 641 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
642 | int ret; |
643 | ||
9b4fce7a JE |
644 | par->match = m->u.kernel.match; |
645 | par->matchinfo = m->data; | |
646 | ||
916a917d | 647 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 648 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
367c6790 | 649 | if (ret < 0) { |
f173c8a1 | 650 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 651 | par.match->name); |
367c6790 | 652 | return ret; |
f173c8a1 | 653 | } |
367c6790 | 654 | return 0; |
f173c8a1 PM |
655 | } |
656 | ||
022748a9 | 657 | static int |
6bdb331b | 658 | find_check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 659 | { |
6709dbbb | 660 | struct xt_match *match; |
3cdc7c95 | 661 | int ret; |
1da177e4 | 662 | |
fd0ec0e6 JE |
663 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
664 | m->u.user.revision); | |
665 | if (IS_ERR(match)) { | |
f173c8a1 | 666 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 667 | return PTR_ERR(match); |
1da177e4 LT |
668 | } |
669 | m->u.kernel.match = match; | |
1da177e4 | 670 | |
6bdb331b | 671 | ret = check_match(m, par); |
3cdc7c95 PM |
672 | if (ret) |
673 | goto err; | |
674 | ||
1da177e4 | 675 | return 0; |
3cdc7c95 PM |
676 | err: |
677 | module_put(m->u.kernel.match->me); | |
678 | return ret; | |
1da177e4 LT |
679 | } |
680 | ||
add67461 | 681 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 682 | { |
af5d6dc2 JE |
683 | struct ip6t_entry_target *t = ip6t_get_target(e); |
684 | struct xt_tgchk_param par = { | |
add67461 | 685 | .net = net, |
af5d6dc2 JE |
686 | .table = name, |
687 | .entryinfo = e, | |
688 | .target = t->u.kernel.target, | |
689 | .targinfo = t->data, | |
690 | .hook_mask = e->comefrom, | |
916a917d | 691 | .family = NFPROTO_IPV6, |
af5d6dc2 | 692 | }; |
1da177e4 | 693 | int ret; |
1da177e4 | 694 | |
f173c8a1 | 695 | t = ip6t_get_target(e); |
916a917d | 696 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 697 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
367c6790 | 698 | if (ret < 0) { |
f173c8a1 PM |
699 | duprintf("ip_tables: check failed for `%s'.\n", |
700 | t->u.kernel.target->name); | |
367c6790 | 701 | return ret; |
1da177e4 | 702 | } |
367c6790 | 703 | return 0; |
f173c8a1 | 704 | } |
1da177e4 | 705 | |
022748a9 | 706 | static int |
a83d8e8d | 707 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
0559518b | 708 | unsigned int size) |
f173c8a1 PM |
709 | { |
710 | struct ip6t_entry_target *t; | |
711 | struct xt_target *target; | |
712 | int ret; | |
713 | unsigned int j; | |
9b4fce7a | 714 | struct xt_mtchk_param mtpar; |
dcea992a | 715 | struct xt_entry_match *ematch; |
f173c8a1 PM |
716 | |
717 | ret = check_entry(e, name); | |
718 | if (ret) | |
719 | return ret; | |
590bdf7f | 720 | |
1da177e4 | 721 | j = 0; |
a83d8e8d | 722 | mtpar.net = net; |
9b4fce7a JE |
723 | mtpar.table = name; |
724 | mtpar.entryinfo = &e->ipv6; | |
725 | mtpar.hook_mask = e->comefrom; | |
916a917d | 726 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 727 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 728 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 729 | if (ret != 0) |
6bdb331b JE |
730 | goto cleanup_matches; |
731 | ++j; | |
dcea992a | 732 | } |
1da177e4 LT |
733 | |
734 | t = ip6t_get_target(e); | |
d2a7b6ba JE |
735 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
736 | t->u.user.revision); | |
737 | if (IS_ERR(target)) { | |
f173c8a1 | 738 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 739 | ret = PTR_ERR(target); |
1da177e4 LT |
740 | goto cleanup_matches; |
741 | } | |
742 | t->u.kernel.target = target; | |
6b7d31fc | 743 | |
add67461 | 744 | ret = check_target(e, net, name); |
3cdc7c95 PM |
745 | if (ret) |
746 | goto err; | |
1da177e4 | 747 | return 0; |
3cdc7c95 PM |
748 | err: |
749 | module_put(t->u.kernel.target->me); | |
1da177e4 | 750 | cleanup_matches: |
6bdb331b JE |
751 | xt_ematch_foreach(ematch, e) { |
752 | if (j-- == 0) | |
dcea992a | 753 | break; |
6bdb331b JE |
754 | cleanup_match(ematch, net); |
755 | } | |
1da177e4 LT |
756 | return ret; |
757 | } | |
758 | ||
d5d1baa1 | 759 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 JE |
760 | { |
761 | const struct ip6t_entry_target *t; | |
762 | unsigned int verdict; | |
763 | ||
764 | if (!unconditional(&e->ipv6)) | |
765 | return false; | |
d5d1baa1 | 766 | t = ip6t_get_target_c(e); |
e2fe35c1 JE |
767 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
768 | return false; | |
769 | verdict = ((struct ip6t_standard_target *)t)->verdict; | |
770 | verdict = -verdict - 1; | |
771 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
772 | } | |
773 | ||
022748a9 | 774 | static int |
1da177e4 | 775 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 776 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
777 | const unsigned char *base, |
778 | const unsigned char *limit, | |
1da177e4 LT |
779 | const unsigned int *hook_entries, |
780 | const unsigned int *underflows, | |
0559518b | 781 | unsigned int valid_hooks) |
1da177e4 LT |
782 | { |
783 | unsigned int h; | |
784 | ||
3666ed1c JP |
785 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
786 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
1da177e4 LT |
787 | duprintf("Bad offset %p\n", e); |
788 | return -EINVAL; | |
789 | } | |
790 | ||
791 | if (e->next_offset | |
792 | < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) { | |
793 | duprintf("checking: element %p size %u\n", | |
794 | e, e->next_offset); | |
795 | return -EINVAL; | |
796 | } | |
797 | ||
798 | /* Check hooks & underflows */ | |
6e23ae2a | 799 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
800 | if (!(valid_hooks & (1 << h))) |
801 | continue; | |
1da177e4 LT |
802 | if ((unsigned char *)e - base == hook_entries[h]) |
803 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 804 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
805 | if (!check_underflow(e)) { |
806 | pr_err("Underflows must be unconditional and " | |
807 | "use the STANDARD target with " | |
808 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
809 | return -EINVAL; |
810 | } | |
1da177e4 | 811 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 812 | } |
1da177e4 LT |
813 | } |
814 | ||
1da177e4 | 815 | /* Clear counters and comefrom */ |
2e4e6a17 | 816 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 817 | e->comefrom = 0; |
1da177e4 LT |
818 | return 0; |
819 | } | |
820 | ||
0559518b | 821 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
1da177e4 | 822 | { |
a2df1648 | 823 | struct xt_tgdtor_param par; |
1da177e4 | 824 | struct ip6t_entry_target *t; |
dcea992a | 825 | struct xt_entry_match *ematch; |
1da177e4 | 826 | |
1da177e4 | 827 | /* Cleanup all matches */ |
dcea992a | 828 | xt_ematch_foreach(ematch, e) |
6bdb331b | 829 | cleanup_match(ematch, net); |
1da177e4 | 830 | t = ip6t_get_target(e); |
a2df1648 | 831 | |
add67461 | 832 | par.net = net; |
a2df1648 JE |
833 | par.target = t->u.kernel.target; |
834 | par.targinfo = t->data; | |
916a917d | 835 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
836 | if (par.target->destroy != NULL) |
837 | par.target->destroy(&par); | |
838 | module_put(par.target->me); | |
1da177e4 LT |
839 | } |
840 | ||
841 | /* Checks and translates the user-supplied table segment (held in | |
842 | newinfo) */ | |
843 | static int | |
0f234214 JE |
844 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
845 | const struct ip6t_replace *repl) | |
1da177e4 | 846 | { |
72b2b1dd | 847 | struct ip6t_entry *iter; |
1da177e4 | 848 | unsigned int i; |
72b2b1dd | 849 | int ret = 0; |
1da177e4 | 850 | |
0f234214 JE |
851 | newinfo->size = repl->size; |
852 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
853 | |
854 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 855 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
856 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
857 | newinfo->underflow[i] = 0xFFFFFFFF; | |
858 | } | |
859 | ||
860 | duprintf("translate_table: size %u\n", newinfo->size); | |
861 | i = 0; | |
862 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
863 | xt_entry_foreach(iter, entry0, newinfo->size) { |
864 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
865 | entry0 + repl->size, |
866 | repl->hook_entry, | |
867 | repl->underflow, | |
868 | repl->valid_hooks); | |
72b2b1dd | 869 | if (ret != 0) |
0559518b JE |
870 | return ret; |
871 | ++i; | |
72b2b1dd | 872 | } |
1da177e4 | 873 | |
0f234214 | 874 | if (i != repl->num_entries) { |
1da177e4 | 875 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 876 | i, repl->num_entries); |
1da177e4 LT |
877 | return -EINVAL; |
878 | } | |
879 | ||
880 | /* Check hooks all assigned */ | |
6e23ae2a | 881 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 882 | /* Only hooks which are valid */ |
0f234214 | 883 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
884 | continue; |
885 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
886 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 887 | i, repl->hook_entry[i]); |
1da177e4 LT |
888 | return -EINVAL; |
889 | } | |
890 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
891 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 892 | i, repl->underflow[i]); |
1da177e4 LT |
893 | return -EINVAL; |
894 | } | |
895 | } | |
896 | ||
0f234214 | 897 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
898 | return -ELOOP; |
899 | ||
1da177e4 LT |
900 | /* Finally, each sanity check must pass */ |
901 | i = 0; | |
72b2b1dd | 902 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 903 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
904 | if (ret != 0) |
905 | break; | |
0559518b | 906 | ++i; |
72b2b1dd | 907 | } |
1da177e4 | 908 | |
74c9c0c1 | 909 | if (ret != 0) { |
0559518b JE |
910 | xt_entry_foreach(iter, entry0, newinfo->size) { |
911 | if (i-- == 0) | |
72b2b1dd | 912 | break; |
0559518b JE |
913 | cleanup_entry(iter, net); |
914 | } | |
74c9c0c1 DM |
915 | return ret; |
916 | } | |
1da177e4 LT |
917 | |
918 | /* And one copy for every other CPU */ | |
6f912042 | 919 | for_each_possible_cpu(i) { |
31836064 ED |
920 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
921 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
922 | } |
923 | ||
9c547959 | 924 | return ret; |
1da177e4 LT |
925 | } |
926 | ||
1da177e4 | 927 | static void |
2e4e6a17 HW |
928 | get_counters(const struct xt_table_info *t, |
929 | struct xt_counters counters[]) | |
1da177e4 | 930 | { |
72b2b1dd | 931 | struct ip6t_entry *iter; |
1da177e4 LT |
932 | unsigned int cpu; |
933 | unsigned int i; | |
31836064 ED |
934 | unsigned int curcpu; |
935 | ||
936 | /* Instead of clearing (by a previous call to memset()) | |
937 | * the counters and using adds, we set the counters | |
938 | * with data used by 'current' CPU | |
942e4a2b SH |
939 | * |
940 | * Bottom half has to be disabled to prevent deadlock | |
941 | * if new softirq were to run and call ipt_do_table | |
31836064 | 942 | */ |
942e4a2b SH |
943 | local_bh_disable(); |
944 | curcpu = smp_processor_id(); | |
31836064 ED |
945 | |
946 | i = 0; | |
0559518b JE |
947 | xt_entry_foreach(iter, t->entries[curcpu], t->size) { |
948 | SET_COUNTER(counters[i], iter->counters.bcnt, | |
6b4ff2d7 | 949 | iter->counters.pcnt); |
0559518b JE |
950 | ++i; |
951 | } | |
1da177e4 | 952 | |
6f912042 | 953 | for_each_possible_cpu(cpu) { |
31836064 ED |
954 | if (cpu == curcpu) |
955 | continue; | |
1da177e4 | 956 | i = 0; |
942e4a2b | 957 | xt_info_wrlock(cpu); |
0559518b JE |
958 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
959 | ADD_COUNTER(counters[i], iter->counters.bcnt, | |
6b4ff2d7 | 960 | iter->counters.pcnt); |
0559518b JE |
961 | ++i; |
962 | } | |
942e4a2b | 963 | xt_info_wrunlock(cpu); |
1da177e4 | 964 | } |
78454473 SH |
965 | local_bh_enable(); |
966 | } | |
967 | ||
d5d1baa1 | 968 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 969 | { |
ed1a6f5e | 970 | unsigned int countersize; |
2e4e6a17 | 971 | struct xt_counters *counters; |
d5d1baa1 | 972 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
973 | |
974 | /* We need atomic snapshot of counters: rest doesn't change | |
975 | (other than comefrom, which userspace doesn't care | |
976 | about). */ | |
2e4e6a17 | 977 | countersize = sizeof(struct xt_counters) * private->number; |
3b84e92b | 978 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
979 | |
980 | if (counters == NULL) | |
942e4a2b | 981 | return ERR_PTR(-ENOMEM); |
78454473 | 982 | |
942e4a2b | 983 | get_counters(private, counters); |
78454473 | 984 | |
49a88d18 | 985 | return counters; |
ed1a6f5e PM |
986 | } |
987 | ||
988 | static int | |
989 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 990 | const struct xt_table *table, |
ed1a6f5e PM |
991 | void __user *userptr) |
992 | { | |
993 | unsigned int off, num; | |
d5d1baa1 | 994 | const struct ip6t_entry *e; |
ed1a6f5e | 995 | struct xt_counters *counters; |
5452e425 | 996 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 997 | int ret = 0; |
5452e425 | 998 | const void *loc_cpu_entry; |
ed1a6f5e PM |
999 | |
1000 | counters = alloc_counters(table); | |
1001 | if (IS_ERR(counters)) | |
1002 | return PTR_ERR(counters); | |
1003 | ||
9c547959 PM |
1004 | /* choose the copy that is on our node/cpu, ... |
1005 | * This choice is lazy (because current thread is | |
1006 | * allowed to migrate to another cpu) | |
1007 | */ | |
2e4e6a17 | 1008 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 1009 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
1010 | ret = -EFAULT; |
1011 | goto free_counters; | |
1012 | } | |
1013 | ||
1014 | /* FIXME: use iterator macros --RR */ | |
1015 | /* ... then go back and fix counters and names */ | |
1016 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
1017 | unsigned int i; | |
5452e425 JE |
1018 | const struct ip6t_entry_match *m; |
1019 | const struct ip6t_entry_target *t; | |
1da177e4 | 1020 | |
31836064 | 1021 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
1022 | if (copy_to_user(userptr + off |
1023 | + offsetof(struct ip6t_entry, counters), | |
1024 | &counters[num], | |
1025 | sizeof(counters[num])) != 0) { | |
1026 | ret = -EFAULT; | |
1027 | goto free_counters; | |
1028 | } | |
1029 | ||
1030 | for (i = sizeof(struct ip6t_entry); | |
1031 | i < e->target_offset; | |
1032 | i += m->u.match_size) { | |
1033 | m = (void *)e + i; | |
1034 | ||
1035 | if (copy_to_user(userptr + off + i | |
1036 | + offsetof(struct ip6t_entry_match, | |
1037 | u.user.name), | |
1038 | m->u.kernel.match->name, | |
1039 | strlen(m->u.kernel.match->name)+1) | |
1040 | != 0) { | |
1041 | ret = -EFAULT; | |
1042 | goto free_counters; | |
1043 | } | |
1044 | } | |
1045 | ||
d5d1baa1 | 1046 | t = ip6t_get_target_c(e); |
1da177e4 LT |
1047 | if (copy_to_user(userptr + off + e->target_offset |
1048 | + offsetof(struct ip6t_entry_target, | |
1049 | u.user.name), | |
1050 | t->u.kernel.target->name, | |
1051 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1052 | ret = -EFAULT; | |
1053 | goto free_counters; | |
1054 | } | |
1055 | } | |
1056 | ||
1057 | free_counters: | |
1058 | vfree(counters); | |
1059 | return ret; | |
1060 | } | |
1061 | ||
3bc3fe5e | 1062 | #ifdef CONFIG_COMPAT |
739674fb | 1063 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
1064 | { |
1065 | int v = *(compat_int_t *)src; | |
1066 | ||
1067 | if (v > 0) | |
1068 | v += xt_compat_calc_jump(AF_INET6, v); | |
1069 | memcpy(dst, &v, sizeof(v)); | |
1070 | } | |
1071 | ||
739674fb | 1072 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
1073 | { |
1074 | compat_int_t cv = *(int *)src; | |
1075 | ||
1076 | if (cv > 0) | |
1077 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1078 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1079 | } | |
1080 | ||
d5d1baa1 | 1081 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 1082 | const struct xt_table_info *info, |
d5d1baa1 | 1083 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 1084 | { |
dcea992a | 1085 | const struct xt_entry_match *ematch; |
d5d1baa1 | 1086 | const struct ip6t_entry_target *t; |
3bc3fe5e PM |
1087 | unsigned int entry_offset; |
1088 | int off, i, ret; | |
1089 | ||
1090 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1091 | entry_offset = (void *)e - base; | |
dcea992a | 1092 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1093 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1094 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
1095 | off += xt_compat_target_offset(t->u.kernel.target); |
1096 | newinfo->size -= off; | |
1097 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1098 | if (ret) | |
1099 | return ret; | |
1100 | ||
1101 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1102 | if (info->hook_entry[i] && | |
1103 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1104 | newinfo->hook_entry[i] -= off; | |
1105 | if (info->underflow[i] && | |
1106 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1107 | newinfo->underflow[i] -= off; | |
1108 | } | |
1109 | return 0; | |
1110 | } | |
1111 | ||
1112 | static int compat_table_info(const struct xt_table_info *info, | |
1113 | struct xt_table_info *newinfo) | |
1114 | { | |
72b2b1dd | 1115 | struct ip6t_entry *iter; |
3bc3fe5e | 1116 | void *loc_cpu_entry; |
0559518b | 1117 | int ret; |
3bc3fe5e PM |
1118 | |
1119 | if (!newinfo || !info) | |
1120 | return -EINVAL; | |
1121 | ||
1122 | /* we dont care about newinfo->entries[] */ | |
1123 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1124 | newinfo->initial_entries = 0; | |
1125 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
72b2b1dd JE |
1126 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1127 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1128 | if (ret != 0) | |
0559518b | 1129 | return ret; |
72b2b1dd | 1130 | } |
0559518b | 1131 | return 0; |
3bc3fe5e PM |
1132 | } |
1133 | #endif | |
1134 | ||
d5d1baa1 JE |
1135 | static int get_info(struct net *net, void __user *user, |
1136 | const int *len, int compat) | |
433665c9 PM |
1137 | { |
1138 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1139 | struct xt_table *t; | |
1140 | int ret; | |
1141 | ||
1142 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1143 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1144 | sizeof(struct ip6t_getinfo)); |
1145 | return -EINVAL; | |
1146 | } | |
1147 | ||
1148 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1149 | return -EFAULT; | |
1150 | ||
1151 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; | |
3bc3fe5e PM |
1152 | #ifdef CONFIG_COMPAT |
1153 | if (compat) | |
1154 | xt_compat_lock(AF_INET6); | |
1155 | #endif | |
336b517f | 1156 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 PM |
1157 | "ip6table_%s", name); |
1158 | if (t && !IS_ERR(t)) { | |
1159 | struct ip6t_getinfo info; | |
5452e425 | 1160 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1161 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1162 | struct xt_table_info tmp; |
1163 | ||
3bc3fe5e | 1164 | if (compat) { |
3bc3fe5e PM |
1165 | ret = compat_table_info(private, &tmp); |
1166 | xt_compat_flush_offsets(AF_INET6); | |
1167 | private = &tmp; | |
1168 | } | |
1169 | #endif | |
433665c9 PM |
1170 | info.valid_hooks = t->valid_hooks; |
1171 | memcpy(info.hook_entry, private->hook_entry, | |
1172 | sizeof(info.hook_entry)); | |
1173 | memcpy(info.underflow, private->underflow, | |
1174 | sizeof(info.underflow)); | |
1175 | info.num_entries = private->number; | |
1176 | info.size = private->size; | |
b5dd674b | 1177 | strcpy(info.name, name); |
433665c9 PM |
1178 | |
1179 | if (copy_to_user(user, &info, *len) != 0) | |
1180 | ret = -EFAULT; | |
1181 | else | |
1182 | ret = 0; | |
1183 | ||
1184 | xt_table_unlock(t); | |
1185 | module_put(t->me); | |
1186 | } else | |
1187 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1188 | #ifdef CONFIG_COMPAT |
1189 | if (compat) | |
1190 | xt_compat_unlock(AF_INET6); | |
1191 | #endif | |
433665c9 PM |
1192 | return ret; |
1193 | } | |
1194 | ||
1da177e4 | 1195 | static int |
d5d1baa1 JE |
1196 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
1197 | const int *len) | |
1da177e4 LT |
1198 | { |
1199 | int ret; | |
d924357c | 1200 | struct ip6t_get_entries get; |
2e4e6a17 | 1201 | struct xt_table *t; |
1da177e4 | 1202 | |
d924357c | 1203 | if (*len < sizeof(get)) { |
c9d8fe13 | 1204 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1205 | return -EINVAL; |
1206 | } | |
1207 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1208 | return -EFAULT; | |
1209 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1210 | duprintf("get_entries: %u != %zu\n", |
1211 | *len, sizeof(get) + get.size); | |
d924357c PM |
1212 | return -EINVAL; |
1213 | } | |
1214 | ||
336b517f | 1215 | t = xt_find_table_lock(net, AF_INET6, get.name); |
6b7d31fc | 1216 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
1217 | struct xt_table_info *private = t->private; |
1218 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1219 | if (get.size == private->size) |
2e4e6a17 | 1220 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1221 | t, uptr->entrytable); |
1222 | else { | |
1223 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1224 | private->size, get.size); |
544473c1 | 1225 | ret = -EAGAIN; |
1da177e4 | 1226 | } |
6b7d31fc | 1227 | module_put(t->me); |
2e4e6a17 | 1228 | xt_table_unlock(t); |
1da177e4 | 1229 | } else |
6b7d31fc | 1230 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1231 | |
1232 | return ret; | |
1233 | } | |
1234 | ||
1235 | static int | |
336b517f | 1236 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1237 | struct xt_table_info *newinfo, unsigned int num_counters, |
1238 | void __user *counters_ptr) | |
1da177e4 LT |
1239 | { |
1240 | int ret; | |
2e4e6a17 | 1241 | struct xt_table *t; |
3bc3fe5e | 1242 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1243 | struct xt_counters *counters; |
5452e425 | 1244 | const void *loc_cpu_old_entry; |
72b2b1dd | 1245 | struct ip6t_entry *iter; |
1da177e4 | 1246 | |
3bc3fe5e PM |
1247 | ret = 0; |
1248 | counters = vmalloc_node(num_counters * sizeof(struct xt_counters), | |
3b84e92b | 1249 | numa_node_id()); |
1da177e4 LT |
1250 | if (!counters) { |
1251 | ret = -ENOMEM; | |
3bc3fe5e | 1252 | goto out; |
1da177e4 | 1253 | } |
1da177e4 | 1254 | |
336b517f | 1255 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1256 | "ip6table_%s", name); |
6b7d31fc HW |
1257 | if (!t || IS_ERR(t)) { |
1258 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1259 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1260 | } |
1da177e4 LT |
1261 | |
1262 | /* You lied! */ | |
3bc3fe5e | 1263 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1264 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1265 | valid_hooks, t->valid_hooks); |
1da177e4 | 1266 | ret = -EINVAL; |
6b7d31fc | 1267 | goto put_module; |
1da177e4 LT |
1268 | } |
1269 | ||
3bc3fe5e | 1270 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1271 | if (!oldinfo) |
1272 | goto put_module; | |
1273 | ||
1274 | /* Update module usage count based on number of rules */ | |
1275 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1276 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1277 | if ((oldinfo->number > oldinfo->initial_entries) || |
1278 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1279 | module_put(t->me); |
1280 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1281 | (newinfo->number <= oldinfo->initial_entries)) | |
1282 | module_put(t->me); | |
1283 | ||
942e4a2b | 1284 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1285 | get_counters(oldinfo, counters); |
942e4a2b | 1286 | |
1da177e4 | 1287 | /* Decrease module usage counts and free resource */ |
31836064 | 1288 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
72b2b1dd | 1289 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1290 | cleanup_entry(iter, net); |
72b2b1dd | 1291 | |
2e4e6a17 | 1292 | xt_free_table_info(oldinfo); |
3bc3fe5e PM |
1293 | if (copy_to_user(counters_ptr, counters, |
1294 | sizeof(struct xt_counters) * num_counters) != 0) | |
1da177e4 LT |
1295 | ret = -EFAULT; |
1296 | vfree(counters); | |
2e4e6a17 | 1297 | xt_table_unlock(t); |
1da177e4 LT |
1298 | return ret; |
1299 | ||
1300 | put_module: | |
1301 | module_put(t->me); | |
2e4e6a17 | 1302 | xt_table_unlock(t); |
1da177e4 | 1303 | free_newinfo_counters_untrans: |
1da177e4 | 1304 | vfree(counters); |
3bc3fe5e PM |
1305 | out: |
1306 | return ret; | |
1307 | } | |
1308 | ||
1309 | static int | |
d5d1baa1 | 1310 | do_replace(struct net *net, const void __user *user, unsigned int len) |
3bc3fe5e PM |
1311 | { |
1312 | int ret; | |
1313 | struct ip6t_replace tmp; | |
1314 | struct xt_table_info *newinfo; | |
1315 | void *loc_cpu_entry; | |
72b2b1dd | 1316 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1317 | |
1318 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1319 | return -EFAULT; | |
1320 | ||
1321 | /* overflow check */ | |
1322 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1323 | return -ENOMEM; | |
1324 | ||
1325 | newinfo = xt_alloc_table_info(tmp.size); | |
1326 | if (!newinfo) | |
1327 | return -ENOMEM; | |
1328 | ||
1329 | /* choose the copy that is on our node/cpu */ | |
1330 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1331 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1332 | tmp.size) != 0) { | |
1333 | ret = -EFAULT; | |
1334 | goto free_newinfo; | |
1335 | } | |
1336 | ||
0f234214 | 1337 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1338 | if (ret != 0) |
1339 | goto free_newinfo; | |
1340 | ||
1341 | duprintf("ip_tables: Translated table\n"); | |
1342 | ||
336b517f | 1343 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1344 | tmp.num_counters, tmp.counters); |
1345 | if (ret) | |
1346 | goto free_newinfo_untrans; | |
1347 | return 0; | |
1348 | ||
1349 | free_newinfo_untrans: | |
72b2b1dd | 1350 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1351 | cleanup_entry(iter, net); |
1da177e4 | 1352 | free_newinfo: |
2e4e6a17 | 1353 | xt_free_table_info(newinfo); |
1da177e4 LT |
1354 | return ret; |
1355 | } | |
1356 | ||
1da177e4 | 1357 | static int |
d5d1baa1 | 1358 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
336b517f | 1359 | int compat) |
1da177e4 | 1360 | { |
942e4a2b | 1361 | unsigned int i, curcpu; |
3bc3fe5e PM |
1362 | struct xt_counters_info tmp; |
1363 | struct xt_counters *paddc; | |
1364 | unsigned int num_counters; | |
1365 | char *name; | |
1366 | int size; | |
1367 | void *ptmp; | |
2e4e6a17 | 1368 | struct xt_table *t; |
5452e425 | 1369 | const struct xt_table_info *private; |
6b7d31fc | 1370 | int ret = 0; |
5452e425 | 1371 | const void *loc_cpu_entry; |
72b2b1dd | 1372 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1373 | #ifdef CONFIG_COMPAT |
1374 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1375 | |
3bc3fe5e PM |
1376 | if (compat) { |
1377 | ptmp = &compat_tmp; | |
1378 | size = sizeof(struct compat_xt_counters_info); | |
1379 | } else | |
1380 | #endif | |
1381 | { | |
1382 | ptmp = &tmp; | |
1383 | size = sizeof(struct xt_counters_info); | |
1384 | } | |
1385 | ||
1386 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1387 | return -EFAULT; |
1388 | ||
3bc3fe5e PM |
1389 | #ifdef CONFIG_COMPAT |
1390 | if (compat) { | |
1391 | num_counters = compat_tmp.num_counters; | |
1392 | name = compat_tmp.name; | |
1393 | } else | |
1394 | #endif | |
1395 | { | |
1396 | num_counters = tmp.num_counters; | |
1397 | name = tmp.name; | |
1398 | } | |
1399 | ||
1400 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1401 | return -EINVAL; |
1402 | ||
3bc3fe5e | 1403 | paddc = vmalloc_node(len - size, numa_node_id()); |
1da177e4 LT |
1404 | if (!paddc) |
1405 | return -ENOMEM; | |
1406 | ||
3bc3fe5e | 1407 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1408 | ret = -EFAULT; |
1409 | goto free; | |
1410 | } | |
1411 | ||
336b517f | 1412 | t = xt_find_table_lock(net, AF_INET6, name); |
6b7d31fc HW |
1413 | if (!t || IS_ERR(t)) { |
1414 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1415 | goto free; |
6b7d31fc | 1416 | } |
1da177e4 | 1417 | |
942e4a2b SH |
1418 | |
1419 | local_bh_disable(); | |
2e4e6a17 | 1420 | private = t->private; |
3bc3fe5e | 1421 | if (private->number != num_counters) { |
1da177e4 LT |
1422 | ret = -EINVAL; |
1423 | goto unlock_up_free; | |
1424 | } | |
1425 | ||
1426 | i = 0; | |
31836064 | 1427 | /* Choose the copy that is on our node */ |
942e4a2b SH |
1428 | curcpu = smp_processor_id(); |
1429 | xt_info_wrlock(curcpu); | |
1430 | loc_cpu_entry = private->entries[curcpu]; | |
0559518b JE |
1431 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1432 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1433 | ++i; | |
1434 | } | |
942e4a2b SH |
1435 | xt_info_wrunlock(curcpu); |
1436 | ||
1da177e4 | 1437 | unlock_up_free: |
942e4a2b | 1438 | local_bh_enable(); |
2e4e6a17 | 1439 | xt_table_unlock(t); |
6b7d31fc | 1440 | module_put(t->me); |
1da177e4 LT |
1441 | free: |
1442 | vfree(paddc); | |
1443 | ||
1444 | return ret; | |
1445 | } | |
1446 | ||
3bc3fe5e PM |
1447 | #ifdef CONFIG_COMPAT |
1448 | struct compat_ip6t_replace { | |
1449 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1450 | u32 valid_hooks; | |
1451 | u32 num_entries; | |
1452 | u32 size; | |
1453 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1454 | u32 underflow[NF_INET_NUMHOOKS]; | |
1455 | u32 num_counters; | |
1456 | compat_uptr_t counters; /* struct ip6t_counters * */ | |
1457 | struct compat_ip6t_entry entries[0]; | |
1458 | }; | |
1459 | ||
1460 | static int | |
1461 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1462 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1463 | unsigned int i) |
3bc3fe5e PM |
1464 | { |
1465 | struct ip6t_entry_target *t; | |
1466 | struct compat_ip6t_entry __user *ce; | |
1467 | u_int16_t target_offset, next_offset; | |
1468 | compat_uint_t origsize; | |
dcea992a JE |
1469 | const struct xt_entry_match *ematch; |
1470 | int ret = 0; | |
3bc3fe5e | 1471 | |
3bc3fe5e PM |
1472 | origsize = *size; |
1473 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
0559518b JE |
1474 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1475 | copy_to_user(&ce->counters, &counters[i], | |
1476 | sizeof(counters[i])) != 0) | |
1477 | return -EFAULT; | |
3bc3fe5e PM |
1478 | |
1479 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1480 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1481 | ||
dcea992a JE |
1482 | xt_ematch_foreach(ematch, e) { |
1483 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1484 | if (ret != 0) | |
6bdb331b | 1485 | return ret; |
dcea992a | 1486 | } |
3bc3fe5e | 1487 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1488 | t = ip6t_get_target(e); |
1489 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1490 | if (ret) | |
0559518b | 1491 | return ret; |
3bc3fe5e | 1492 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1493 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1494 | put_user(next_offset, &ce->next_offset) != 0) | |
1495 | return -EFAULT; | |
3bc3fe5e | 1496 | return 0; |
3bc3fe5e PM |
1497 | } |
1498 | ||
022748a9 | 1499 | static int |
3bc3fe5e PM |
1500 | compat_find_calc_match(struct ip6t_entry_match *m, |
1501 | const char *name, | |
1502 | const struct ip6t_ip6 *ipv6, | |
1503 | unsigned int hookmask, | |
6bdb331b | 1504 | int *size) |
3bc3fe5e PM |
1505 | { |
1506 | struct xt_match *match; | |
1507 | ||
fd0ec0e6 JE |
1508 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
1509 | m->u.user.revision); | |
1510 | if (IS_ERR(match)) { | |
3bc3fe5e PM |
1511 | duprintf("compat_check_calc_match: `%s' not found\n", |
1512 | m->u.user.name); | |
fd0ec0e6 | 1513 | return PTR_ERR(match); |
3bc3fe5e PM |
1514 | } |
1515 | m->u.kernel.match = match; | |
1516 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1517 | return 0; |
1518 | } | |
1519 | ||
0559518b | 1520 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e PM |
1521 | { |
1522 | struct ip6t_entry_target *t; | |
dcea992a | 1523 | struct xt_entry_match *ematch; |
3bc3fe5e | 1524 | |
3bc3fe5e | 1525 | /* Cleanup all matches */ |
dcea992a | 1526 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1527 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1528 | t = compat_ip6t_get_target(e); |
1529 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1530 | } |
1531 | ||
022748a9 | 1532 | static int |
3bc3fe5e PM |
1533 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1534 | struct xt_table_info *newinfo, | |
1535 | unsigned int *size, | |
d5d1baa1 JE |
1536 | const unsigned char *base, |
1537 | const unsigned char *limit, | |
1538 | const unsigned int *hook_entries, | |
1539 | const unsigned int *underflows, | |
3bc3fe5e PM |
1540 | const char *name) |
1541 | { | |
dcea992a | 1542 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1543 | struct ip6t_entry_target *t; |
1544 | struct xt_target *target; | |
1545 | unsigned int entry_offset; | |
b0a6363c PM |
1546 | unsigned int j; |
1547 | int ret, off, h; | |
3bc3fe5e PM |
1548 | |
1549 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1550 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
1551 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
3bc3fe5e PM |
1552 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1553 | return -EINVAL; | |
1554 | } | |
1555 | ||
1556 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1557 | sizeof(struct compat_xt_entry_target)) { | |
1558 | duprintf("checking: element %p size %u\n", | |
1559 | e, e->next_offset); | |
1560 | return -EINVAL; | |
1561 | } | |
1562 | ||
1563 | /* For purposes of check_entry casting the compat entry is fine */ | |
1564 | ret = check_entry((struct ip6t_entry *)e, name); | |
1565 | if (ret) | |
1566 | return ret; | |
1567 | ||
1568 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1569 | entry_offset = (void *)e - (void *)base; | |
1570 | j = 0; | |
dcea992a JE |
1571 | xt_ematch_foreach(ematch, e) { |
1572 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1573 | &e->ipv6, e->comefrom, &off); |
dcea992a | 1574 | if (ret != 0) |
6bdb331b JE |
1575 | goto release_matches; |
1576 | ++j; | |
dcea992a | 1577 | } |
3bc3fe5e PM |
1578 | |
1579 | t = compat_ip6t_get_target(e); | |
d2a7b6ba JE |
1580 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
1581 | t->u.user.revision); | |
1582 | if (IS_ERR(target)) { | |
3bc3fe5e PM |
1583 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
1584 | t->u.user.name); | |
d2a7b6ba | 1585 | ret = PTR_ERR(target); |
3bc3fe5e PM |
1586 | goto release_matches; |
1587 | } | |
1588 | t->u.kernel.target = target; | |
1589 | ||
1590 | off += xt_compat_target_offset(target); | |
1591 | *size += off; | |
1592 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1593 | if (ret) | |
1594 | goto out; | |
1595 | ||
1596 | /* Check hooks & underflows */ | |
1597 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1598 | if ((unsigned char *)e - base == hook_entries[h]) | |
1599 | newinfo->hook_entry[h] = hook_entries[h]; | |
1600 | if ((unsigned char *)e - base == underflows[h]) | |
1601 | newinfo->underflow[h] = underflows[h]; | |
1602 | } | |
1603 | ||
1604 | /* Clear counters and comefrom */ | |
1605 | memset(&e->counters, 0, sizeof(e->counters)); | |
1606 | e->comefrom = 0; | |
3bc3fe5e PM |
1607 | return 0; |
1608 | ||
1609 | out: | |
1610 | module_put(t->u.kernel.target->me); | |
1611 | release_matches: | |
6bdb331b JE |
1612 | xt_ematch_foreach(ematch, e) { |
1613 | if (j-- == 0) | |
dcea992a | 1614 | break; |
6bdb331b JE |
1615 | module_put(ematch->u.kernel.match->me); |
1616 | } | |
3bc3fe5e PM |
1617 | return ret; |
1618 | } | |
1619 | ||
1620 | static int | |
1621 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1622 | unsigned int *size, const char *name, | |
1623 | struct xt_table_info *newinfo, unsigned char *base) | |
1624 | { | |
1625 | struct ip6t_entry_target *t; | |
1626 | struct xt_target *target; | |
1627 | struct ip6t_entry *de; | |
1628 | unsigned int origsize; | |
1629 | int ret, h; | |
dcea992a | 1630 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1631 | |
1632 | ret = 0; | |
1633 | origsize = *size; | |
1634 | de = (struct ip6t_entry *)*dstptr; | |
1635 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1636 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1637 | ||
1638 | *dstptr += sizeof(struct ip6t_entry); | |
1639 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1640 | ||
dcea992a JE |
1641 | xt_ematch_foreach(ematch, e) { |
1642 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1643 | if (ret != 0) | |
6bdb331b | 1644 | return ret; |
dcea992a | 1645 | } |
3bc3fe5e PM |
1646 | de->target_offset = e->target_offset - (origsize - *size); |
1647 | t = compat_ip6t_get_target(e); | |
1648 | target = t->u.kernel.target; | |
1649 | xt_compat_target_from_user(t, dstptr, size); | |
1650 | ||
1651 | de->next_offset = e->next_offset - (origsize - *size); | |
1652 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1653 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1654 | newinfo->hook_entry[h] -= origsize - *size; | |
1655 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1656 | newinfo->underflow[h] -= origsize - *size; | |
1657 | } | |
1658 | return ret; | |
1659 | } | |
1660 | ||
f54e9367 | 1661 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
0559518b | 1662 | const char *name) |
3bc3fe5e | 1663 | { |
b0a6363c | 1664 | unsigned int j; |
dcea992a | 1665 | int ret = 0; |
9b4fce7a | 1666 | struct xt_mtchk_param mtpar; |
dcea992a | 1667 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1668 | |
1669 | j = 0; | |
f54e9367 | 1670 | mtpar.net = net; |
9b4fce7a JE |
1671 | mtpar.table = name; |
1672 | mtpar.entryinfo = &e->ipv6; | |
1673 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1674 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 1675 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1676 | ret = check_match(ematch, &mtpar); |
dcea992a | 1677 | if (ret != 0) |
6bdb331b JE |
1678 | goto cleanup_matches; |
1679 | ++j; | |
dcea992a | 1680 | } |
3bc3fe5e | 1681 | |
add67461 | 1682 | ret = check_target(e, net, name); |
3bc3fe5e PM |
1683 | if (ret) |
1684 | goto cleanup_matches; | |
3bc3fe5e PM |
1685 | return 0; |
1686 | ||
1687 | cleanup_matches: | |
6bdb331b JE |
1688 | xt_ematch_foreach(ematch, e) { |
1689 | if (j-- == 0) | |
dcea992a | 1690 | break; |
6bdb331b JE |
1691 | cleanup_match(ematch, net); |
1692 | } | |
3bc3fe5e PM |
1693 | return ret; |
1694 | } | |
1695 | ||
1696 | static int | |
f54e9367 AD |
1697 | translate_compat_table(struct net *net, |
1698 | const char *name, | |
3bc3fe5e PM |
1699 | unsigned int valid_hooks, |
1700 | struct xt_table_info **pinfo, | |
1701 | void **pentry0, | |
1702 | unsigned int total_size, | |
1703 | unsigned int number, | |
1704 | unsigned int *hook_entries, | |
1705 | unsigned int *underflows) | |
1706 | { | |
1707 | unsigned int i, j; | |
1708 | struct xt_table_info *newinfo, *info; | |
1709 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1710 | struct compat_ip6t_entry *iter0; |
1711 | struct ip6t_entry *iter1; | |
3bc3fe5e | 1712 | unsigned int size; |
72b2b1dd | 1713 | int ret = 0; |
3bc3fe5e PM |
1714 | |
1715 | info = *pinfo; | |
1716 | entry0 = *pentry0; | |
1717 | size = total_size; | |
1718 | info->number = number; | |
1719 | ||
1720 | /* Init all hooks to impossible value. */ | |
1721 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1722 | info->hook_entry[i] = 0xFFFFFFFF; | |
1723 | info->underflow[i] = 0xFFFFFFFF; | |
1724 | } | |
1725 | ||
1726 | duprintf("translate_compat_table: size %u\n", info->size); | |
1727 | j = 0; | |
1728 | xt_compat_lock(AF_INET6); | |
1729 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
1730 | xt_entry_foreach(iter0, entry0, total_size) { |
1731 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1732 | entry0, |
1733 | entry0 + total_size, | |
1734 | hook_entries, | |
1735 | underflows, | |
1736 | name); | |
72b2b1dd | 1737 | if (ret != 0) |
0559518b JE |
1738 | goto out_unlock; |
1739 | ++j; | |
72b2b1dd | 1740 | } |
3bc3fe5e PM |
1741 | |
1742 | ret = -EINVAL; | |
1743 | if (j != number) { | |
1744 | duprintf("translate_compat_table: %u not %u entries\n", | |
1745 | j, number); | |
1746 | goto out_unlock; | |
1747 | } | |
1748 | ||
1749 | /* Check hooks all assigned */ | |
1750 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1751 | /* Only hooks which are valid */ | |
1752 | if (!(valid_hooks & (1 << i))) | |
1753 | continue; | |
1754 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1755 | duprintf("Invalid hook entry %u %u\n", | |
1756 | i, hook_entries[i]); | |
1757 | goto out_unlock; | |
1758 | } | |
1759 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1760 | duprintf("Invalid underflow %u %u\n", | |
1761 | i, underflows[i]); | |
1762 | goto out_unlock; | |
1763 | } | |
1764 | } | |
1765 | ||
1766 | ret = -ENOMEM; | |
1767 | newinfo = xt_alloc_table_info(size); | |
1768 | if (!newinfo) | |
1769 | goto out_unlock; | |
1770 | ||
1771 | newinfo->number = number; | |
1772 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1773 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1774 | newinfo->underflow[i] = info->underflow[i]; | |
1775 | } | |
1776 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1777 | pos = entry1; | |
1778 | size = total_size; | |
72b2b1dd | 1779 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1780 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1781 | name, newinfo, entry1); | |
72b2b1dd JE |
1782 | if (ret != 0) |
1783 | break; | |
1784 | } | |
3bc3fe5e PM |
1785 | xt_compat_flush_offsets(AF_INET6); |
1786 | xt_compat_unlock(AF_INET6); | |
1787 | if (ret) | |
1788 | goto free_newinfo; | |
1789 | ||
1790 | ret = -ELOOP; | |
1791 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1792 | goto free_newinfo; | |
1793 | ||
1794 | i = 0; | |
72b2b1dd | 1795 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1796 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1797 | if (ret != 0) |
1798 | break; | |
0559518b | 1799 | ++i; |
72b2b1dd | 1800 | } |
3bc3fe5e | 1801 | if (ret) { |
72b2b1dd JE |
1802 | /* |
1803 | * The first i matches need cleanup_entry (calls ->destroy) | |
1804 | * because they had called ->check already. The other j-i | |
1805 | * entries need only release. | |
1806 | */ | |
1807 | int skip = i; | |
3bc3fe5e | 1808 | j -= i; |
72b2b1dd JE |
1809 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1810 | if (skip-- > 0) | |
1811 | continue; | |
0559518b | 1812 | if (j-- == 0) |
72b2b1dd | 1813 | break; |
0559518b | 1814 | compat_release_entry(iter0); |
72b2b1dd | 1815 | } |
0559518b JE |
1816 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1817 | if (i-- == 0) | |
72b2b1dd | 1818 | break; |
0559518b JE |
1819 | cleanup_entry(iter1, net); |
1820 | } | |
3bc3fe5e PM |
1821 | xt_free_table_info(newinfo); |
1822 | return ret; | |
1823 | } | |
1824 | ||
1825 | /* And one copy for every other CPU */ | |
1826 | for_each_possible_cpu(i) | |
1827 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1828 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1829 | ||
1830 | *pinfo = newinfo; | |
1831 | *pentry0 = entry1; | |
1832 | xt_free_table_info(info); | |
1833 | return 0; | |
1834 | ||
1835 | free_newinfo: | |
1836 | xt_free_table_info(newinfo); | |
1837 | out: | |
0559518b JE |
1838 | xt_entry_foreach(iter0, entry0, total_size) { |
1839 | if (j-- == 0) | |
72b2b1dd | 1840 | break; |
0559518b JE |
1841 | compat_release_entry(iter0); |
1842 | } | |
3bc3fe5e PM |
1843 | return ret; |
1844 | out_unlock: | |
1845 | xt_compat_flush_offsets(AF_INET6); | |
1846 | xt_compat_unlock(AF_INET6); | |
1847 | goto out; | |
1848 | } | |
1849 | ||
1850 | static int | |
336b517f | 1851 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1852 | { |
1853 | int ret; | |
1854 | struct compat_ip6t_replace tmp; | |
1855 | struct xt_table_info *newinfo; | |
1856 | void *loc_cpu_entry; | |
72b2b1dd | 1857 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1858 | |
1859 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1860 | return -EFAULT; | |
1861 | ||
1862 | /* overflow check */ | |
1863 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1864 | return -ENOMEM; | |
1865 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1866 | return -ENOMEM; | |
1867 | ||
1868 | newinfo = xt_alloc_table_info(tmp.size); | |
1869 | if (!newinfo) | |
1870 | return -ENOMEM; | |
1871 | ||
9c547959 | 1872 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1873 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1874 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1875 | tmp.size) != 0) { | |
1876 | ret = -EFAULT; | |
1877 | goto free_newinfo; | |
1878 | } | |
1879 | ||
f54e9367 | 1880 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1881 | &newinfo, &loc_cpu_entry, tmp.size, |
1882 | tmp.num_entries, tmp.hook_entry, | |
1883 | tmp.underflow); | |
1884 | if (ret != 0) | |
1885 | goto free_newinfo; | |
1886 | ||
1887 | duprintf("compat_do_replace: Translated table\n"); | |
1888 | ||
336b517f | 1889 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1890 | tmp.num_counters, compat_ptr(tmp.counters)); |
1891 | if (ret) | |
1892 | goto free_newinfo_untrans; | |
1893 | return 0; | |
1894 | ||
1895 | free_newinfo_untrans: | |
72b2b1dd | 1896 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1897 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1898 | free_newinfo: |
1899 | xt_free_table_info(newinfo); | |
1900 | return ret; | |
1901 | } | |
1902 | ||
1903 | static int | |
1904 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1905 | unsigned int len) | |
1906 | { | |
1907 | int ret; | |
1908 | ||
1909 | if (!capable(CAP_NET_ADMIN)) | |
1910 | return -EPERM; | |
1911 | ||
1912 | switch (cmd) { | |
1913 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1914 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1915 | break; |
1916 | ||
1917 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1918 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1919 | break; |
1920 | ||
1921 | default: | |
1922 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1923 | ret = -EINVAL; | |
1924 | } | |
1925 | ||
1926 | return ret; | |
1927 | } | |
1928 | ||
1929 | struct compat_ip6t_get_entries { | |
1930 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1931 | compat_uint_t size; | |
1932 | struct compat_ip6t_entry entrytable[0]; | |
1933 | }; | |
1934 | ||
1935 | static int | |
1936 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1937 | void __user *userptr) | |
1938 | { | |
1939 | struct xt_counters *counters; | |
5452e425 | 1940 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1941 | void __user *pos; |
1942 | unsigned int size; | |
1943 | int ret = 0; | |
5452e425 | 1944 | const void *loc_cpu_entry; |
3bc3fe5e | 1945 | unsigned int i = 0; |
72b2b1dd | 1946 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1947 | |
1948 | counters = alloc_counters(table); | |
1949 | if (IS_ERR(counters)) | |
1950 | return PTR_ERR(counters); | |
1951 | ||
1952 | /* choose the copy that is on our node/cpu, ... | |
1953 | * This choice is lazy (because current thread is | |
1954 | * allowed to migrate to another cpu) | |
1955 | */ | |
1956 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1957 | pos = userptr; | |
1958 | size = total_size; | |
72b2b1dd JE |
1959 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1960 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1961 | &size, counters, i++); |
72b2b1dd JE |
1962 | if (ret != 0) |
1963 | break; | |
1964 | } | |
3bc3fe5e PM |
1965 | |
1966 | vfree(counters); | |
1967 | return ret; | |
1968 | } | |
1969 | ||
1970 | static int | |
336b517f AD |
1971 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1972 | int *len) | |
3bc3fe5e PM |
1973 | { |
1974 | int ret; | |
1975 | struct compat_ip6t_get_entries get; | |
1976 | struct xt_table *t; | |
1977 | ||
1978 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1979 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1980 | return -EINVAL; |
1981 | } | |
1982 | ||
1983 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1984 | return -EFAULT; | |
1985 | ||
1986 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1987 | duprintf("compat_get_entries: %u != %zu\n", |
1988 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1989 | return -EINVAL; |
1990 | } | |
1991 | ||
1992 | xt_compat_lock(AF_INET6); | |
336b517f | 1993 | t = xt_find_table_lock(net, AF_INET6, get.name); |
3bc3fe5e | 1994 | if (t && !IS_ERR(t)) { |
5452e425 | 1995 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1996 | struct xt_table_info info; |
9c547959 | 1997 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1998 | ret = compat_table_info(private, &info); |
1999 | if (!ret && get.size == info.size) { | |
2000 | ret = compat_copy_entries_to_user(private->size, | |
2001 | t, uptr->entrytable); | |
2002 | } else if (!ret) { | |
2003 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 2004 | private->size, get.size); |
544473c1 | 2005 | ret = -EAGAIN; |
3bc3fe5e PM |
2006 | } |
2007 | xt_compat_flush_offsets(AF_INET6); | |
2008 | module_put(t->me); | |
2009 | xt_table_unlock(t); | |
2010 | } else | |
2011 | ret = t ? PTR_ERR(t) : -ENOENT; | |
2012 | ||
2013 | xt_compat_unlock(AF_INET6); | |
2014 | return ret; | |
2015 | } | |
2016 | ||
2017 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
2018 | ||
2019 | static int | |
2020 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2021 | { | |
2022 | int ret; | |
2023 | ||
2024 | if (!capable(CAP_NET_ADMIN)) | |
2025 | return -EPERM; | |
2026 | ||
2027 | switch (cmd) { | |
2028 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 2029 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
2030 | break; |
2031 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 2032 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
2033 | break; |
2034 | default: | |
2035 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
2036 | } | |
2037 | return ret; | |
2038 | } | |
2039 | #endif | |
2040 | ||
1da177e4 LT |
2041 | static int |
2042 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2043 | { | |
2044 | int ret; | |
2045 | ||
2046 | if (!capable(CAP_NET_ADMIN)) | |
2047 | return -EPERM; | |
2048 | ||
2049 | switch (cmd) { | |
2050 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2051 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2052 | break; |
2053 | ||
2054 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2055 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2056 | break; |
2057 | ||
2058 | default: | |
2059 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2060 | ret = -EINVAL; | |
2061 | } | |
2062 | ||
2063 | return ret; | |
2064 | } | |
2065 | ||
2066 | static int | |
2067 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2068 | { | |
2069 | int ret; | |
2070 | ||
2071 | if (!capable(CAP_NET_ADMIN)) | |
2072 | return -EPERM; | |
2073 | ||
2074 | switch (cmd) { | |
433665c9 | 2075 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2076 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2077 | break; |
1da177e4 | 2078 | |
d924357c | 2079 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2080 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2081 | break; |
1da177e4 | 2082 | |
6b7d31fc HW |
2083 | case IP6T_SO_GET_REVISION_MATCH: |
2084 | case IP6T_SO_GET_REVISION_TARGET: { | |
2085 | struct ip6t_get_revision rev; | |
2e4e6a17 | 2086 | int target; |
6b7d31fc HW |
2087 | |
2088 | if (*len != sizeof(rev)) { | |
2089 | ret = -EINVAL; | |
2090 | break; | |
2091 | } | |
2092 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2093 | ret = -EFAULT; | |
2094 | break; | |
2095 | } | |
2096 | ||
2097 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2098 | target = 1; |
6b7d31fc | 2099 | else |
2e4e6a17 | 2100 | target = 0; |
6b7d31fc | 2101 | |
2e4e6a17 HW |
2102 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2103 | rev.revision, | |
2104 | target, &ret), | |
6b7d31fc HW |
2105 | "ip6t_%s", rev.name); |
2106 | break; | |
2107 | } | |
2108 | ||
1da177e4 LT |
2109 | default: |
2110 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2111 | ret = -EINVAL; | |
2112 | } | |
2113 | ||
2114 | return ret; | |
2115 | } | |
2116 | ||
35aad0ff JE |
2117 | struct xt_table *ip6t_register_table(struct net *net, |
2118 | const struct xt_table *table, | |
336b517f | 2119 | const struct ip6t_replace *repl) |
1da177e4 LT |
2120 | { |
2121 | int ret; | |
2e4e6a17 | 2122 | struct xt_table_info *newinfo; |
259d4e41 | 2123 | struct xt_table_info bootstrap |
1da177e4 | 2124 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2125 | void *loc_cpu_entry; |
a98da11d | 2126 | struct xt_table *new_table; |
1da177e4 | 2127 | |
2e4e6a17 | 2128 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2129 | if (!newinfo) { |
2130 | ret = -ENOMEM; | |
2131 | goto out; | |
2132 | } | |
1da177e4 | 2133 | |
9c547959 | 2134 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2135 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2136 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2137 | |
0f234214 | 2138 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2139 | if (ret != 0) |
2140 | goto out_free; | |
1da177e4 | 2141 | |
336b517f | 2142 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2143 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2144 | ret = PTR_ERR(new_table); |
2145 | goto out_free; | |
1da177e4 | 2146 | } |
44d34e72 | 2147 | return new_table; |
1da177e4 | 2148 | |
44d34e72 AD |
2149 | out_free: |
2150 | xt_free_table_info(newinfo); | |
2151 | out: | |
2152 | return ERR_PTR(ret); | |
1da177e4 LT |
2153 | } |
2154 | ||
f54e9367 | 2155 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2156 | { |
2e4e6a17 | 2157 | struct xt_table_info *private; |
31836064 | 2158 | void *loc_cpu_entry; |
df200969 | 2159 | struct module *table_owner = table->me; |
72b2b1dd | 2160 | struct ip6t_entry *iter; |
31836064 | 2161 | |
2e4e6a17 | 2162 | private = xt_unregister_table(table); |
1da177e4 LT |
2163 | |
2164 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2165 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2166 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2167 | cleanup_entry(iter, net); |
df200969 AD |
2168 | if (private->number > private->initial_entries) |
2169 | module_put(table_owner); | |
2e4e6a17 | 2170 | xt_free_table_info(private); |
1da177e4 LT |
2171 | } |
2172 | ||
2173 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2174 | static inline bool |
1da177e4 LT |
2175 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2176 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2177 | bool invert) |
1da177e4 LT |
2178 | { |
2179 | return (type == test_type && code >= min_code && code <= max_code) | |
2180 | ^ invert; | |
2181 | } | |
2182 | ||
1d93a9cb | 2183 | static bool |
f7108a20 | 2184 | icmp6_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2185 | { |
5452e425 JE |
2186 | const struct icmp6hdr *ic; |
2187 | struct icmp6hdr _icmph; | |
f7108a20 | 2188 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2189 | |
2190 | /* Must not be a fragment. */ | |
f7108a20 | 2191 | if (par->fragoff != 0) |
1d93a9cb | 2192 | return false; |
1da177e4 | 2193 | |
f7108a20 | 2194 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2195 | if (ic == NULL) { |
2196 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2197 | * can't. Hence, no choice but to drop. |
2198 | */ | |
1da177e4 | 2199 | duprintf("Dropping evil ICMP tinygram.\n"); |
f7108a20 | 2200 | *par->hotdrop = true; |
1d93a9cb | 2201 | return false; |
1da177e4 LT |
2202 | } |
2203 | ||
2204 | return icmp6_type_code_match(icmpinfo->type, | |
2205 | icmpinfo->code[0], | |
2206 | icmpinfo->code[1], | |
2207 | ic->icmp6_type, ic->icmp6_code, | |
2208 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2209 | } | |
2210 | ||
2211 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 2212 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2213 | { |
9b4fce7a | 2214 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2215 | |
7f939713 PM |
2216 | /* Must specify no unknown invflags */ |
2217 | return !(icmpinfo->invflags & ~IP6T_ICMP_INV); | |
1da177e4 LT |
2218 | } |
2219 | ||
2220 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2221 | static struct xt_target ip6t_standard_target __read_mostly = { |
1da177e4 | 2222 | .name = IP6T_STANDARD_TARGET, |
7f939713 | 2223 | .targetsize = sizeof(int), |
4ba351cf | 2224 | .family = NFPROTO_IPV6, |
3bc3fe5e PM |
2225 | #ifdef CONFIG_COMPAT |
2226 | .compatsize = sizeof(compat_int_t), | |
2227 | .compat_from_user = compat_standard_from_user, | |
2228 | .compat_to_user = compat_standard_to_user, | |
2229 | #endif | |
1da177e4 LT |
2230 | }; |
2231 | ||
9f15c530 | 2232 | static struct xt_target ip6t_error_target __read_mostly = { |
1da177e4 LT |
2233 | .name = IP6T_ERROR_TARGET, |
2234 | .target = ip6t_error, | |
7f939713 | 2235 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, |
4ba351cf | 2236 | .family = NFPROTO_IPV6, |
1da177e4 LT |
2237 | }; |
2238 | ||
2239 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2240 | .pf = PF_INET6, | |
2241 | .set_optmin = IP6T_BASE_CTL, | |
2242 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2243 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2244 | #ifdef CONFIG_COMPAT |
2245 | .compat_set = compat_do_ip6t_set_ctl, | |
2246 | #endif | |
1da177e4 LT |
2247 | .get_optmin = IP6T_BASE_CTL, |
2248 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2249 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2250 | #ifdef CONFIG_COMPAT |
2251 | .compat_get = compat_do_ip6t_get_ctl, | |
2252 | #endif | |
16fcec35 | 2253 | .owner = THIS_MODULE, |
1da177e4 LT |
2254 | }; |
2255 | ||
9f15c530 | 2256 | static struct xt_match icmp6_matchstruct __read_mostly = { |
1da177e4 | 2257 | .name = "icmp6", |
9c547959 | 2258 | .match = icmp6_match, |
7f939713 PM |
2259 | .matchsize = sizeof(struct ip6t_icmp), |
2260 | .checkentry = icmp6_checkentry, | |
2261 | .proto = IPPROTO_ICMPV6, | |
4ba351cf | 2262 | .family = NFPROTO_IPV6, |
1da177e4 LT |
2263 | }; |
2264 | ||
3cb609d5 AD |
2265 | static int __net_init ip6_tables_net_init(struct net *net) |
2266 | { | |
383ca5b8 | 2267 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2268 | } |
2269 | ||
2270 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2271 | { | |
383ca5b8 | 2272 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2273 | } |
2274 | ||
2275 | static struct pernet_operations ip6_tables_net_ops = { | |
2276 | .init = ip6_tables_net_init, | |
2277 | .exit = ip6_tables_net_exit, | |
2278 | }; | |
2279 | ||
65b4b4e8 | 2280 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2281 | { |
2282 | int ret; | |
2283 | ||
3cb609d5 | 2284 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2285 | if (ret < 0) |
2286 | goto err1; | |
2e4e6a17 | 2287 | |
1da177e4 | 2288 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2289 | ret = xt_register_target(&ip6t_standard_target); |
2290 | if (ret < 0) | |
2291 | goto err2; | |
2292 | ret = xt_register_target(&ip6t_error_target); | |
2293 | if (ret < 0) | |
2294 | goto err3; | |
2295 | ret = xt_register_match(&icmp6_matchstruct); | |
2296 | if (ret < 0) | |
2297 | goto err4; | |
1da177e4 LT |
2298 | |
2299 | /* Register setsockopt */ | |
2300 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2301 | if (ret < 0) |
2302 | goto err5; | |
1da177e4 | 2303 | |
ff67e4e4 | 2304 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2305 | return 0; |
0eff66e6 PM |
2306 | |
2307 | err5: | |
2308 | xt_unregister_match(&icmp6_matchstruct); | |
2309 | err4: | |
2310 | xt_unregister_target(&ip6t_error_target); | |
2311 | err3: | |
2312 | xt_unregister_target(&ip6t_standard_target); | |
2313 | err2: | |
3cb609d5 | 2314 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2315 | err1: |
2316 | return ret; | |
1da177e4 LT |
2317 | } |
2318 | ||
65b4b4e8 | 2319 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2320 | { |
2321 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2322 | |
a45049c5 PNA |
2323 | xt_unregister_match(&icmp6_matchstruct); |
2324 | xt_unregister_target(&ip6t_error_target); | |
2325 | xt_unregister_target(&ip6t_standard_target); | |
3cb609d5 AD |
2326 | |
2327 | unregister_pernet_subsys(&ip6_tables_net_ops); | |
1da177e4 LT |
2328 | } |
2329 | ||
e674d0f3 | 2330 | /* |
b777e0ce PM |
2331 | * find the offset to specified header or the protocol number of last header |
2332 | * if target < 0. "last header" is transport protocol header, ESP, or | |
2333 | * "No next header". | |
2334 | * | |
2335 | * If target header is found, its offset is set in *offset and return protocol | |
2336 | * number. Otherwise, return -1. | |
2337 | * | |
6d381634 PM |
2338 | * If the first fragment doesn't contain the final protocol header or |
2339 | * NEXTHDR_NONE it is considered invalid. | |
2340 | * | |
b777e0ce PM |
2341 | * Note that non-1st fragment is special case that "the protocol number |
2342 | * of last header" is "next header" field in Fragment header. In this case, | |
2343 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
2344 | * isn't NULL. | |
e674d0f3 | 2345 | * |
e674d0f3 | 2346 | */ |
b777e0ce PM |
2347 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
2348 | int target, unsigned short *fragoff) | |
e674d0f3 | 2349 | { |
6b88dd96 | 2350 | unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); |
0660e03f | 2351 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
e674d0f3 YK |
2352 | unsigned int len = skb->len - start; |
2353 | ||
b777e0ce PM |
2354 | if (fragoff) |
2355 | *fragoff = 0; | |
2356 | ||
e674d0f3 YK |
2357 | while (nexthdr != target) { |
2358 | struct ipv6_opt_hdr _hdr, *hp; | |
2359 | unsigned int hdrlen; | |
2360 | ||
b777e0ce PM |
2361 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
2362 | if (target < 0) | |
2363 | break; | |
6d381634 | 2364 | return -ENOENT; |
b777e0ce PM |
2365 | } |
2366 | ||
e674d0f3 YK |
2367 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
2368 | if (hp == NULL) | |
6d381634 | 2369 | return -EBADMSG; |
e674d0f3 | 2370 | if (nexthdr == NEXTHDR_FRAGMENT) { |
e69a4adc AV |
2371 | unsigned short _frag_off; |
2372 | __be16 *fp; | |
e674d0f3 YK |
2373 | fp = skb_header_pointer(skb, |
2374 | start+offsetof(struct frag_hdr, | |
2375 | frag_off), | |
2376 | sizeof(_frag_off), | |
2377 | &_frag_off); | |
2378 | if (fp == NULL) | |
6d381634 | 2379 | return -EBADMSG; |
e674d0f3 | 2380 | |
b777e0ce PM |
2381 | _frag_off = ntohs(*fp) & ~0x7; |
2382 | if (_frag_off) { | |
2383 | if (target < 0 && | |
2384 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
337dde79 | 2385 | hp->nexthdr == NEXTHDR_NONE)) { |
b777e0ce PM |
2386 | if (fragoff) |
2387 | *fragoff = _frag_off; | |
2388 | return hp->nexthdr; | |
2389 | } | |
6d381634 | 2390 | return -ENOENT; |
b777e0ce | 2391 | } |
e674d0f3 YK |
2392 | hdrlen = 8; |
2393 | } else if (nexthdr == NEXTHDR_AUTH) | |
1ab1457c | 2394 | hdrlen = (hp->hdrlen + 2) << 2; |
e674d0f3 | 2395 | else |
1ab1457c | 2396 | hdrlen = ipv6_optlen(hp); |
e674d0f3 YK |
2397 | |
2398 | nexthdr = hp->nexthdr; | |
2399 | len -= hdrlen; | |
2400 | start += hdrlen; | |
2401 | } | |
2402 | ||
2403 | *offset = start; | |
b777e0ce | 2404 | return nexthdr; |
e674d0f3 YK |
2405 | } |
2406 | ||
1da177e4 LT |
2407 | EXPORT_SYMBOL(ip6t_register_table); |
2408 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2409 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2410 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 2411 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 2412 | |
65b4b4e8 AM |
2413 | module_init(ip6_tables_init); |
2414 | module_exit(ip6_tables_fini); |