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 | |
0f234214 JE |
848 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
849 | const struct ip6t_replace *repl) | |
1da177e4 | 850 | { |
72b2b1dd | 851 | struct ip6t_entry *iter; |
1da177e4 | 852 | unsigned int i; |
72b2b1dd | 853 | int ret = 0; |
1da177e4 | 854 | |
0f234214 JE |
855 | newinfo->size = repl->size; |
856 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
857 | |
858 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 859 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
860 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
861 | newinfo->underflow[i] = 0xFFFFFFFF; | |
862 | } | |
863 | ||
864 | duprintf("translate_table: size %u\n", newinfo->size); | |
865 | i = 0; | |
866 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
867 | xt_entry_foreach(iter, entry0, newinfo->size) { |
868 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
0f234214 JE |
869 | entry0 + repl->size, repl->hook_entry, repl->underflow, |
870 | repl->valid_hooks); | |
72b2b1dd | 871 | if (ret != 0) |
0559518b JE |
872 | return ret; |
873 | ++i; | |
72b2b1dd | 874 | } |
1da177e4 | 875 | |
0f234214 | 876 | if (i != repl->num_entries) { |
1da177e4 | 877 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 878 | i, repl->num_entries); |
1da177e4 LT |
879 | return -EINVAL; |
880 | } | |
881 | ||
882 | /* Check hooks all assigned */ | |
6e23ae2a | 883 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 884 | /* Only hooks which are valid */ |
0f234214 | 885 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
886 | continue; |
887 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
888 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 889 | i, repl->hook_entry[i]); |
1da177e4 LT |
890 | return -EINVAL; |
891 | } | |
892 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
893 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 894 | i, repl->underflow[i]); |
1da177e4 LT |
895 | return -EINVAL; |
896 | } | |
897 | } | |
898 | ||
0f234214 | 899 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
900 | return -ELOOP; |
901 | ||
1da177e4 LT |
902 | /* Finally, each sanity check must pass */ |
903 | i = 0; | |
72b2b1dd | 904 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 905 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
906 | if (ret != 0) |
907 | break; | |
0559518b | 908 | ++i; |
72b2b1dd | 909 | } |
1da177e4 | 910 | |
74c9c0c1 | 911 | if (ret != 0) { |
0559518b JE |
912 | xt_entry_foreach(iter, entry0, newinfo->size) { |
913 | if (i-- == 0) | |
72b2b1dd | 914 | break; |
0559518b JE |
915 | cleanup_entry(iter, net); |
916 | } | |
74c9c0c1 DM |
917 | return ret; |
918 | } | |
1da177e4 LT |
919 | |
920 | /* And one copy for every other CPU */ | |
6f912042 | 921 | for_each_possible_cpu(i) { |
31836064 ED |
922 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
923 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
924 | } |
925 | ||
9c547959 | 926 | return ret; |
1da177e4 LT |
927 | } |
928 | ||
1da177e4 | 929 | static void |
2e4e6a17 HW |
930 | get_counters(const struct xt_table_info *t, |
931 | struct xt_counters counters[]) | |
1da177e4 | 932 | { |
72b2b1dd | 933 | struct ip6t_entry *iter; |
1da177e4 LT |
934 | unsigned int cpu; |
935 | unsigned int i; | |
31836064 ED |
936 | unsigned int curcpu; |
937 | ||
938 | /* Instead of clearing (by a previous call to memset()) | |
939 | * the counters and using adds, we set the counters | |
940 | * with data used by 'current' CPU | |
942e4a2b SH |
941 | * |
942 | * Bottom half has to be disabled to prevent deadlock | |
943 | * if new softirq were to run and call ipt_do_table | |
31836064 | 944 | */ |
942e4a2b SH |
945 | local_bh_disable(); |
946 | curcpu = smp_processor_id(); | |
31836064 ED |
947 | |
948 | i = 0; | |
0559518b JE |
949 | xt_entry_foreach(iter, t->entries[curcpu], t->size) { |
950 | SET_COUNTER(counters[i], iter->counters.bcnt, | |
951 | iter->counters.pcnt); | |
952 | ++i; | |
953 | } | |
1da177e4 | 954 | |
6f912042 | 955 | for_each_possible_cpu(cpu) { |
31836064 ED |
956 | if (cpu == curcpu) |
957 | continue; | |
1da177e4 | 958 | i = 0; |
942e4a2b | 959 | xt_info_wrlock(cpu); |
0559518b JE |
960 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
961 | ADD_COUNTER(counters[i], iter->counters.bcnt, | |
962 | iter->counters.pcnt); | |
963 | ++i; | |
964 | } | |
942e4a2b | 965 | xt_info_wrunlock(cpu); |
1da177e4 | 966 | } |
78454473 SH |
967 | local_bh_enable(); |
968 | } | |
969 | ||
d5d1baa1 | 970 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 971 | { |
ed1a6f5e | 972 | unsigned int countersize; |
2e4e6a17 | 973 | struct xt_counters *counters; |
d5d1baa1 | 974 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
975 | |
976 | /* We need atomic snapshot of counters: rest doesn't change | |
977 | (other than comefrom, which userspace doesn't care | |
978 | about). */ | |
2e4e6a17 | 979 | countersize = sizeof(struct xt_counters) * private->number; |
3b84e92b | 980 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
981 | |
982 | if (counters == NULL) | |
942e4a2b | 983 | return ERR_PTR(-ENOMEM); |
78454473 | 984 | |
942e4a2b | 985 | get_counters(private, counters); |
78454473 | 986 | |
49a88d18 | 987 | return counters; |
ed1a6f5e PM |
988 | } |
989 | ||
990 | static int | |
991 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 992 | const struct xt_table *table, |
ed1a6f5e PM |
993 | void __user *userptr) |
994 | { | |
995 | unsigned int off, num; | |
d5d1baa1 | 996 | const struct ip6t_entry *e; |
ed1a6f5e | 997 | struct xt_counters *counters; |
5452e425 | 998 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 999 | int ret = 0; |
5452e425 | 1000 | const void *loc_cpu_entry; |
ed1a6f5e PM |
1001 | |
1002 | counters = alloc_counters(table); | |
1003 | if (IS_ERR(counters)) | |
1004 | return PTR_ERR(counters); | |
1005 | ||
9c547959 PM |
1006 | /* choose the copy that is on our node/cpu, ... |
1007 | * This choice is lazy (because current thread is | |
1008 | * allowed to migrate to another cpu) | |
1009 | */ | |
2e4e6a17 | 1010 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 1011 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
1012 | ret = -EFAULT; |
1013 | goto free_counters; | |
1014 | } | |
1015 | ||
1016 | /* FIXME: use iterator macros --RR */ | |
1017 | /* ... then go back and fix counters and names */ | |
1018 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
1019 | unsigned int i; | |
5452e425 JE |
1020 | const struct ip6t_entry_match *m; |
1021 | const struct ip6t_entry_target *t; | |
1da177e4 | 1022 | |
31836064 | 1023 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
1024 | if (copy_to_user(userptr + off |
1025 | + offsetof(struct ip6t_entry, counters), | |
1026 | &counters[num], | |
1027 | sizeof(counters[num])) != 0) { | |
1028 | ret = -EFAULT; | |
1029 | goto free_counters; | |
1030 | } | |
1031 | ||
1032 | for (i = sizeof(struct ip6t_entry); | |
1033 | i < e->target_offset; | |
1034 | i += m->u.match_size) { | |
1035 | m = (void *)e + i; | |
1036 | ||
1037 | if (copy_to_user(userptr + off + i | |
1038 | + offsetof(struct ip6t_entry_match, | |
1039 | u.user.name), | |
1040 | m->u.kernel.match->name, | |
1041 | strlen(m->u.kernel.match->name)+1) | |
1042 | != 0) { | |
1043 | ret = -EFAULT; | |
1044 | goto free_counters; | |
1045 | } | |
1046 | } | |
1047 | ||
d5d1baa1 | 1048 | t = ip6t_get_target_c(e); |
1da177e4 LT |
1049 | if (copy_to_user(userptr + off + e->target_offset |
1050 | + offsetof(struct ip6t_entry_target, | |
1051 | u.user.name), | |
1052 | t->u.kernel.target->name, | |
1053 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1054 | ret = -EFAULT; | |
1055 | goto free_counters; | |
1056 | } | |
1057 | } | |
1058 | ||
1059 | free_counters: | |
1060 | vfree(counters); | |
1061 | return ret; | |
1062 | } | |
1063 | ||
3bc3fe5e | 1064 | #ifdef CONFIG_COMPAT |
739674fb | 1065 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
1066 | { |
1067 | int v = *(compat_int_t *)src; | |
1068 | ||
1069 | if (v > 0) | |
1070 | v += xt_compat_calc_jump(AF_INET6, v); | |
1071 | memcpy(dst, &v, sizeof(v)); | |
1072 | } | |
1073 | ||
739674fb | 1074 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
1075 | { |
1076 | compat_int_t cv = *(int *)src; | |
1077 | ||
1078 | if (cv > 0) | |
1079 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1080 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1081 | } | |
1082 | ||
d5d1baa1 | 1083 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 1084 | const struct xt_table_info *info, |
d5d1baa1 | 1085 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 1086 | { |
dcea992a | 1087 | const struct xt_entry_match *ematch; |
d5d1baa1 | 1088 | const struct ip6t_entry_target *t; |
3bc3fe5e PM |
1089 | unsigned int entry_offset; |
1090 | int off, i, ret; | |
1091 | ||
1092 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1093 | entry_offset = (void *)e - base; | |
dcea992a | 1094 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1095 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1096 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
1097 | off += xt_compat_target_offset(t->u.kernel.target); |
1098 | newinfo->size -= off; | |
1099 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1100 | if (ret) | |
1101 | return ret; | |
1102 | ||
1103 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1104 | if (info->hook_entry[i] && | |
1105 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1106 | newinfo->hook_entry[i] -= off; | |
1107 | if (info->underflow[i] && | |
1108 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1109 | newinfo->underflow[i] -= off; | |
1110 | } | |
1111 | return 0; | |
1112 | } | |
1113 | ||
1114 | static int compat_table_info(const struct xt_table_info *info, | |
1115 | struct xt_table_info *newinfo) | |
1116 | { | |
72b2b1dd | 1117 | struct ip6t_entry *iter; |
3bc3fe5e | 1118 | void *loc_cpu_entry; |
0559518b | 1119 | int ret; |
3bc3fe5e PM |
1120 | |
1121 | if (!newinfo || !info) | |
1122 | return -EINVAL; | |
1123 | ||
1124 | /* we dont care about newinfo->entries[] */ | |
1125 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1126 | newinfo->initial_entries = 0; | |
1127 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
72b2b1dd JE |
1128 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1129 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1130 | if (ret != 0) | |
0559518b | 1131 | return ret; |
72b2b1dd | 1132 | } |
0559518b | 1133 | return 0; |
3bc3fe5e PM |
1134 | } |
1135 | #endif | |
1136 | ||
d5d1baa1 JE |
1137 | static int get_info(struct net *net, void __user *user, |
1138 | const int *len, int compat) | |
433665c9 PM |
1139 | { |
1140 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1141 | struct xt_table *t; | |
1142 | int ret; | |
1143 | ||
1144 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1145 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1146 | sizeof(struct ip6t_getinfo)); |
1147 | return -EINVAL; | |
1148 | } | |
1149 | ||
1150 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1151 | return -EFAULT; | |
1152 | ||
1153 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; | |
3bc3fe5e PM |
1154 | #ifdef CONFIG_COMPAT |
1155 | if (compat) | |
1156 | xt_compat_lock(AF_INET6); | |
1157 | #endif | |
336b517f | 1158 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 PM |
1159 | "ip6table_%s", name); |
1160 | if (t && !IS_ERR(t)) { | |
1161 | struct ip6t_getinfo info; | |
5452e425 | 1162 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1163 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1164 | struct xt_table_info tmp; |
1165 | ||
3bc3fe5e | 1166 | if (compat) { |
3bc3fe5e PM |
1167 | ret = compat_table_info(private, &tmp); |
1168 | xt_compat_flush_offsets(AF_INET6); | |
1169 | private = &tmp; | |
1170 | } | |
1171 | #endif | |
433665c9 PM |
1172 | info.valid_hooks = t->valid_hooks; |
1173 | memcpy(info.hook_entry, private->hook_entry, | |
1174 | sizeof(info.hook_entry)); | |
1175 | memcpy(info.underflow, private->underflow, | |
1176 | sizeof(info.underflow)); | |
1177 | info.num_entries = private->number; | |
1178 | info.size = private->size; | |
b5dd674b | 1179 | strcpy(info.name, name); |
433665c9 PM |
1180 | |
1181 | if (copy_to_user(user, &info, *len) != 0) | |
1182 | ret = -EFAULT; | |
1183 | else | |
1184 | ret = 0; | |
1185 | ||
1186 | xt_table_unlock(t); | |
1187 | module_put(t->me); | |
1188 | } else | |
1189 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1190 | #ifdef CONFIG_COMPAT |
1191 | if (compat) | |
1192 | xt_compat_unlock(AF_INET6); | |
1193 | #endif | |
433665c9 PM |
1194 | return ret; |
1195 | } | |
1196 | ||
1da177e4 | 1197 | static int |
d5d1baa1 JE |
1198 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
1199 | const int *len) | |
1da177e4 LT |
1200 | { |
1201 | int ret; | |
d924357c | 1202 | struct ip6t_get_entries get; |
2e4e6a17 | 1203 | struct xt_table *t; |
1da177e4 | 1204 | |
d924357c | 1205 | if (*len < sizeof(get)) { |
c9d8fe13 | 1206 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1207 | return -EINVAL; |
1208 | } | |
1209 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1210 | return -EFAULT; | |
1211 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1212 | duprintf("get_entries: %u != %zu\n", |
1213 | *len, sizeof(get) + get.size); | |
d924357c PM |
1214 | return -EINVAL; |
1215 | } | |
1216 | ||
336b517f | 1217 | t = xt_find_table_lock(net, AF_INET6, get.name); |
6b7d31fc | 1218 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
1219 | struct xt_table_info *private = t->private; |
1220 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1221 | if (get.size == private->size) |
2e4e6a17 | 1222 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1223 | t, uptr->entrytable); |
1224 | else { | |
1225 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1226 | private->size, get.size); |
544473c1 | 1227 | ret = -EAGAIN; |
1da177e4 | 1228 | } |
6b7d31fc | 1229 | module_put(t->me); |
2e4e6a17 | 1230 | xt_table_unlock(t); |
1da177e4 | 1231 | } else |
6b7d31fc | 1232 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1233 | |
1234 | return ret; | |
1235 | } | |
1236 | ||
1237 | static int | |
336b517f | 1238 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1239 | struct xt_table_info *newinfo, unsigned int num_counters, |
1240 | void __user *counters_ptr) | |
1da177e4 LT |
1241 | { |
1242 | int ret; | |
2e4e6a17 | 1243 | struct xt_table *t; |
3bc3fe5e | 1244 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1245 | struct xt_counters *counters; |
5452e425 | 1246 | const void *loc_cpu_old_entry; |
72b2b1dd | 1247 | struct ip6t_entry *iter; |
1da177e4 | 1248 | |
3bc3fe5e PM |
1249 | ret = 0; |
1250 | counters = vmalloc_node(num_counters * sizeof(struct xt_counters), | |
3b84e92b | 1251 | numa_node_id()); |
1da177e4 LT |
1252 | if (!counters) { |
1253 | ret = -ENOMEM; | |
3bc3fe5e | 1254 | goto out; |
1da177e4 | 1255 | } |
1da177e4 | 1256 | |
336b517f | 1257 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1258 | "ip6table_%s", name); |
6b7d31fc HW |
1259 | if (!t || IS_ERR(t)) { |
1260 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1261 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1262 | } |
1da177e4 LT |
1263 | |
1264 | /* You lied! */ | |
3bc3fe5e | 1265 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1266 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1267 | valid_hooks, t->valid_hooks); |
1da177e4 | 1268 | ret = -EINVAL; |
6b7d31fc | 1269 | goto put_module; |
1da177e4 LT |
1270 | } |
1271 | ||
3bc3fe5e | 1272 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1273 | if (!oldinfo) |
1274 | goto put_module; | |
1275 | ||
1276 | /* Update module usage count based on number of rules */ | |
1277 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1278 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1279 | if ((oldinfo->number > oldinfo->initial_entries) || |
1280 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1281 | module_put(t->me); |
1282 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1283 | (newinfo->number <= oldinfo->initial_entries)) | |
1284 | module_put(t->me); | |
1285 | ||
942e4a2b | 1286 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1287 | get_counters(oldinfo, counters); |
942e4a2b | 1288 | |
1da177e4 | 1289 | /* Decrease module usage counts and free resource */ |
31836064 | 1290 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
72b2b1dd | 1291 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1292 | cleanup_entry(iter, net); |
72b2b1dd | 1293 | |
2e4e6a17 | 1294 | xt_free_table_info(oldinfo); |
3bc3fe5e PM |
1295 | if (copy_to_user(counters_ptr, counters, |
1296 | sizeof(struct xt_counters) * num_counters) != 0) | |
1da177e4 LT |
1297 | ret = -EFAULT; |
1298 | vfree(counters); | |
2e4e6a17 | 1299 | xt_table_unlock(t); |
1da177e4 LT |
1300 | return ret; |
1301 | ||
1302 | put_module: | |
1303 | module_put(t->me); | |
2e4e6a17 | 1304 | xt_table_unlock(t); |
1da177e4 | 1305 | free_newinfo_counters_untrans: |
1da177e4 | 1306 | vfree(counters); |
3bc3fe5e PM |
1307 | out: |
1308 | return ret; | |
1309 | } | |
1310 | ||
1311 | static int | |
d5d1baa1 | 1312 | do_replace(struct net *net, const void __user *user, unsigned int len) |
3bc3fe5e PM |
1313 | { |
1314 | int ret; | |
1315 | struct ip6t_replace tmp; | |
1316 | struct xt_table_info *newinfo; | |
1317 | void *loc_cpu_entry; | |
72b2b1dd | 1318 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1319 | |
1320 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1321 | return -EFAULT; | |
1322 | ||
1323 | /* overflow check */ | |
1324 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1325 | return -ENOMEM; | |
1326 | ||
1327 | newinfo = xt_alloc_table_info(tmp.size); | |
1328 | if (!newinfo) | |
1329 | return -ENOMEM; | |
1330 | ||
1331 | /* choose the copy that is on our node/cpu */ | |
1332 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1333 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1334 | tmp.size) != 0) { | |
1335 | ret = -EFAULT; | |
1336 | goto free_newinfo; | |
1337 | } | |
1338 | ||
0f234214 | 1339 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1340 | if (ret != 0) |
1341 | goto free_newinfo; | |
1342 | ||
1343 | duprintf("ip_tables: Translated table\n"); | |
1344 | ||
336b517f | 1345 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1346 | tmp.num_counters, tmp.counters); |
1347 | if (ret) | |
1348 | goto free_newinfo_untrans; | |
1349 | return 0; | |
1350 | ||
1351 | free_newinfo_untrans: | |
72b2b1dd | 1352 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1353 | cleanup_entry(iter, net); |
1da177e4 | 1354 | free_newinfo: |
2e4e6a17 | 1355 | xt_free_table_info(newinfo); |
1da177e4 LT |
1356 | return ret; |
1357 | } | |
1358 | ||
1da177e4 | 1359 | static int |
d5d1baa1 | 1360 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
336b517f | 1361 | int compat) |
1da177e4 | 1362 | { |
942e4a2b | 1363 | unsigned int i, curcpu; |
3bc3fe5e PM |
1364 | struct xt_counters_info tmp; |
1365 | struct xt_counters *paddc; | |
1366 | unsigned int num_counters; | |
1367 | char *name; | |
1368 | int size; | |
1369 | void *ptmp; | |
2e4e6a17 | 1370 | struct xt_table *t; |
5452e425 | 1371 | const struct xt_table_info *private; |
6b7d31fc | 1372 | int ret = 0; |
5452e425 | 1373 | const void *loc_cpu_entry; |
72b2b1dd | 1374 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1375 | #ifdef CONFIG_COMPAT |
1376 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1377 | |
3bc3fe5e PM |
1378 | if (compat) { |
1379 | ptmp = &compat_tmp; | |
1380 | size = sizeof(struct compat_xt_counters_info); | |
1381 | } else | |
1382 | #endif | |
1383 | { | |
1384 | ptmp = &tmp; | |
1385 | size = sizeof(struct xt_counters_info); | |
1386 | } | |
1387 | ||
1388 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1389 | return -EFAULT; |
1390 | ||
3bc3fe5e PM |
1391 | #ifdef CONFIG_COMPAT |
1392 | if (compat) { | |
1393 | num_counters = compat_tmp.num_counters; | |
1394 | name = compat_tmp.name; | |
1395 | } else | |
1396 | #endif | |
1397 | { | |
1398 | num_counters = tmp.num_counters; | |
1399 | name = tmp.name; | |
1400 | } | |
1401 | ||
1402 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1403 | return -EINVAL; |
1404 | ||
3bc3fe5e | 1405 | paddc = vmalloc_node(len - size, numa_node_id()); |
1da177e4 LT |
1406 | if (!paddc) |
1407 | return -ENOMEM; | |
1408 | ||
3bc3fe5e | 1409 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1410 | ret = -EFAULT; |
1411 | goto free; | |
1412 | } | |
1413 | ||
336b517f | 1414 | t = xt_find_table_lock(net, AF_INET6, name); |
6b7d31fc HW |
1415 | if (!t || IS_ERR(t)) { |
1416 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1417 | goto free; |
6b7d31fc | 1418 | } |
1da177e4 | 1419 | |
942e4a2b SH |
1420 | |
1421 | local_bh_disable(); | |
2e4e6a17 | 1422 | private = t->private; |
3bc3fe5e | 1423 | if (private->number != num_counters) { |
1da177e4 LT |
1424 | ret = -EINVAL; |
1425 | goto unlock_up_free; | |
1426 | } | |
1427 | ||
1428 | i = 0; | |
31836064 | 1429 | /* Choose the copy that is on our node */ |
942e4a2b SH |
1430 | curcpu = smp_processor_id(); |
1431 | xt_info_wrlock(curcpu); | |
1432 | loc_cpu_entry = private->entries[curcpu]; | |
0559518b JE |
1433 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1434 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1435 | ++i; | |
1436 | } | |
942e4a2b SH |
1437 | xt_info_wrunlock(curcpu); |
1438 | ||
1da177e4 | 1439 | unlock_up_free: |
942e4a2b | 1440 | local_bh_enable(); |
2e4e6a17 | 1441 | xt_table_unlock(t); |
6b7d31fc | 1442 | module_put(t->me); |
1da177e4 LT |
1443 | free: |
1444 | vfree(paddc); | |
1445 | ||
1446 | return ret; | |
1447 | } | |
1448 | ||
3bc3fe5e PM |
1449 | #ifdef CONFIG_COMPAT |
1450 | struct compat_ip6t_replace { | |
1451 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1452 | u32 valid_hooks; | |
1453 | u32 num_entries; | |
1454 | u32 size; | |
1455 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1456 | u32 underflow[NF_INET_NUMHOOKS]; | |
1457 | u32 num_counters; | |
1458 | compat_uptr_t counters; /* struct ip6t_counters * */ | |
1459 | struct compat_ip6t_entry entries[0]; | |
1460 | }; | |
1461 | ||
1462 | static int | |
1463 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1464 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1465 | unsigned int i) |
3bc3fe5e PM |
1466 | { |
1467 | struct ip6t_entry_target *t; | |
1468 | struct compat_ip6t_entry __user *ce; | |
1469 | u_int16_t target_offset, next_offset; | |
1470 | compat_uint_t origsize; | |
dcea992a JE |
1471 | const struct xt_entry_match *ematch; |
1472 | int ret = 0; | |
3bc3fe5e | 1473 | |
3bc3fe5e PM |
1474 | origsize = *size; |
1475 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
0559518b JE |
1476 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1477 | copy_to_user(&ce->counters, &counters[i], | |
1478 | sizeof(counters[i])) != 0) | |
1479 | return -EFAULT; | |
3bc3fe5e PM |
1480 | |
1481 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1482 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1483 | ||
dcea992a JE |
1484 | xt_ematch_foreach(ematch, e) { |
1485 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1486 | if (ret != 0) | |
6bdb331b | 1487 | return ret; |
dcea992a | 1488 | } |
3bc3fe5e | 1489 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1490 | t = ip6t_get_target(e); |
1491 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1492 | if (ret) | |
0559518b | 1493 | return ret; |
3bc3fe5e | 1494 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1495 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1496 | put_user(next_offset, &ce->next_offset) != 0) | |
1497 | return -EFAULT; | |
3bc3fe5e | 1498 | return 0; |
3bc3fe5e PM |
1499 | } |
1500 | ||
022748a9 | 1501 | static int |
3bc3fe5e PM |
1502 | compat_find_calc_match(struct ip6t_entry_match *m, |
1503 | const char *name, | |
1504 | const struct ip6t_ip6 *ipv6, | |
1505 | unsigned int hookmask, | |
6bdb331b | 1506 | int *size) |
3bc3fe5e PM |
1507 | { |
1508 | struct xt_match *match; | |
1509 | ||
1510 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, | |
1511 | m->u.user.revision), | |
1512 | "ip6t_%s", m->u.user.name); | |
1513 | if (IS_ERR(match) || !match) { | |
1514 | duprintf("compat_check_calc_match: `%s' not found\n", | |
1515 | m->u.user.name); | |
1516 | return match ? PTR_ERR(match) : -ENOENT; | |
1517 | } | |
1518 | m->u.kernel.match = match; | |
1519 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1520 | return 0; |
1521 | } | |
1522 | ||
0559518b | 1523 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e PM |
1524 | { |
1525 | struct ip6t_entry_target *t; | |
dcea992a | 1526 | struct xt_entry_match *ematch; |
3bc3fe5e | 1527 | |
3bc3fe5e | 1528 | /* Cleanup all matches */ |
dcea992a | 1529 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1530 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1531 | t = compat_ip6t_get_target(e); |
1532 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1533 | } |
1534 | ||
022748a9 | 1535 | static int |
3bc3fe5e PM |
1536 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1537 | struct xt_table_info *newinfo, | |
1538 | unsigned int *size, | |
d5d1baa1 JE |
1539 | const unsigned char *base, |
1540 | const unsigned char *limit, | |
1541 | const unsigned int *hook_entries, | |
1542 | const unsigned int *underflows, | |
3bc3fe5e PM |
1543 | const char *name) |
1544 | { | |
dcea992a | 1545 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1546 | struct ip6t_entry_target *t; |
1547 | struct xt_target *target; | |
1548 | unsigned int entry_offset; | |
b0a6363c PM |
1549 | unsigned int j; |
1550 | int ret, off, h; | |
3bc3fe5e PM |
1551 | |
1552 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1553 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
1554 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
3bc3fe5e PM |
1555 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1556 | return -EINVAL; | |
1557 | } | |
1558 | ||
1559 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1560 | sizeof(struct compat_xt_entry_target)) { | |
1561 | duprintf("checking: element %p size %u\n", | |
1562 | e, e->next_offset); | |
1563 | return -EINVAL; | |
1564 | } | |
1565 | ||
1566 | /* For purposes of check_entry casting the compat entry is fine */ | |
1567 | ret = check_entry((struct ip6t_entry *)e, name); | |
1568 | if (ret) | |
1569 | return ret; | |
1570 | ||
1571 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1572 | entry_offset = (void *)e - (void *)base; | |
1573 | j = 0; | |
dcea992a JE |
1574 | xt_ematch_foreach(ematch, e) { |
1575 | ret = compat_find_calc_match(ematch, name, | |
6bdb331b | 1576 | &e->ipv6, e->comefrom, &off); |
dcea992a | 1577 | if (ret != 0) |
6bdb331b JE |
1578 | goto release_matches; |
1579 | ++j; | |
dcea992a | 1580 | } |
3bc3fe5e PM |
1581 | |
1582 | t = compat_ip6t_get_target(e); | |
1583 | target = try_then_request_module(xt_find_target(AF_INET6, | |
1584 | t->u.user.name, | |
1585 | t->u.user.revision), | |
1586 | "ip6t_%s", t->u.user.name); | |
1587 | if (IS_ERR(target) || !target) { | |
1588 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", | |
1589 | t->u.user.name); | |
1590 | ret = target ? PTR_ERR(target) : -ENOENT; | |
1591 | goto release_matches; | |
1592 | } | |
1593 | t->u.kernel.target = target; | |
1594 | ||
1595 | off += xt_compat_target_offset(target); | |
1596 | *size += off; | |
1597 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1598 | if (ret) | |
1599 | goto out; | |
1600 | ||
1601 | /* Check hooks & underflows */ | |
1602 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1603 | if ((unsigned char *)e - base == hook_entries[h]) | |
1604 | newinfo->hook_entry[h] = hook_entries[h]; | |
1605 | if ((unsigned char *)e - base == underflows[h]) | |
1606 | newinfo->underflow[h] = underflows[h]; | |
1607 | } | |
1608 | ||
1609 | /* Clear counters and comefrom */ | |
1610 | memset(&e->counters, 0, sizeof(e->counters)); | |
1611 | e->comefrom = 0; | |
3bc3fe5e PM |
1612 | return 0; |
1613 | ||
1614 | out: | |
1615 | module_put(t->u.kernel.target->me); | |
1616 | release_matches: | |
6bdb331b JE |
1617 | xt_ematch_foreach(ematch, e) { |
1618 | if (j-- == 0) | |
dcea992a | 1619 | break; |
6bdb331b JE |
1620 | module_put(ematch->u.kernel.match->me); |
1621 | } | |
3bc3fe5e PM |
1622 | return ret; |
1623 | } | |
1624 | ||
1625 | static int | |
1626 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1627 | unsigned int *size, const char *name, | |
1628 | struct xt_table_info *newinfo, unsigned char *base) | |
1629 | { | |
1630 | struct ip6t_entry_target *t; | |
1631 | struct xt_target *target; | |
1632 | struct ip6t_entry *de; | |
1633 | unsigned int origsize; | |
1634 | int ret, h; | |
dcea992a | 1635 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1636 | |
1637 | ret = 0; | |
1638 | origsize = *size; | |
1639 | de = (struct ip6t_entry *)*dstptr; | |
1640 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1641 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1642 | ||
1643 | *dstptr += sizeof(struct ip6t_entry); | |
1644 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1645 | ||
dcea992a JE |
1646 | xt_ematch_foreach(ematch, e) { |
1647 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1648 | if (ret != 0) | |
6bdb331b | 1649 | return ret; |
dcea992a | 1650 | } |
3bc3fe5e PM |
1651 | de->target_offset = e->target_offset - (origsize - *size); |
1652 | t = compat_ip6t_get_target(e); | |
1653 | target = t->u.kernel.target; | |
1654 | xt_compat_target_from_user(t, dstptr, size); | |
1655 | ||
1656 | de->next_offset = e->next_offset - (origsize - *size); | |
1657 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1658 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1659 | newinfo->hook_entry[h] -= origsize - *size; | |
1660 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1661 | newinfo->underflow[h] -= origsize - *size; | |
1662 | } | |
1663 | return ret; | |
1664 | } | |
1665 | ||
f54e9367 | 1666 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
0559518b | 1667 | const char *name) |
3bc3fe5e | 1668 | { |
b0a6363c | 1669 | unsigned int j; |
dcea992a | 1670 | int ret = 0; |
9b4fce7a | 1671 | struct xt_mtchk_param mtpar; |
dcea992a | 1672 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1673 | |
1674 | j = 0; | |
f54e9367 | 1675 | mtpar.net = net; |
9b4fce7a JE |
1676 | mtpar.table = name; |
1677 | mtpar.entryinfo = &e->ipv6; | |
1678 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1679 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 1680 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1681 | ret = check_match(ematch, &mtpar); |
dcea992a | 1682 | if (ret != 0) |
6bdb331b JE |
1683 | goto cleanup_matches; |
1684 | ++j; | |
dcea992a | 1685 | } |
3bc3fe5e | 1686 | |
add67461 | 1687 | ret = check_target(e, net, name); |
3bc3fe5e PM |
1688 | if (ret) |
1689 | goto cleanup_matches; | |
3bc3fe5e PM |
1690 | return 0; |
1691 | ||
1692 | cleanup_matches: | |
6bdb331b JE |
1693 | xt_ematch_foreach(ematch, e) { |
1694 | if (j-- == 0) | |
dcea992a | 1695 | break; |
6bdb331b JE |
1696 | cleanup_match(ematch, net); |
1697 | } | |
3bc3fe5e PM |
1698 | return ret; |
1699 | } | |
1700 | ||
1701 | static int | |
f54e9367 AD |
1702 | translate_compat_table(struct net *net, |
1703 | const char *name, | |
3bc3fe5e PM |
1704 | unsigned int valid_hooks, |
1705 | struct xt_table_info **pinfo, | |
1706 | void **pentry0, | |
1707 | unsigned int total_size, | |
1708 | unsigned int number, | |
1709 | unsigned int *hook_entries, | |
1710 | unsigned int *underflows) | |
1711 | { | |
1712 | unsigned int i, j; | |
1713 | struct xt_table_info *newinfo, *info; | |
1714 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1715 | struct compat_ip6t_entry *iter0; |
1716 | struct ip6t_entry *iter1; | |
3bc3fe5e | 1717 | unsigned int size; |
72b2b1dd | 1718 | int ret = 0; |
3bc3fe5e PM |
1719 | |
1720 | info = *pinfo; | |
1721 | entry0 = *pentry0; | |
1722 | size = total_size; | |
1723 | info->number = number; | |
1724 | ||
1725 | /* Init all hooks to impossible value. */ | |
1726 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1727 | info->hook_entry[i] = 0xFFFFFFFF; | |
1728 | info->underflow[i] = 0xFFFFFFFF; | |
1729 | } | |
1730 | ||
1731 | duprintf("translate_compat_table: size %u\n", info->size); | |
1732 | j = 0; | |
1733 | xt_compat_lock(AF_INET6); | |
1734 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
1735 | xt_entry_foreach(iter0, entry0, total_size) { |
1736 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
1737 | entry0, entry0 + total_size, hook_entries, underflows, | |
0559518b | 1738 | name); |
72b2b1dd | 1739 | if (ret != 0) |
0559518b JE |
1740 | goto out_unlock; |
1741 | ++j; | |
72b2b1dd | 1742 | } |
3bc3fe5e PM |
1743 | |
1744 | ret = -EINVAL; | |
1745 | if (j != number) { | |
1746 | duprintf("translate_compat_table: %u not %u entries\n", | |
1747 | j, number); | |
1748 | goto out_unlock; | |
1749 | } | |
1750 | ||
1751 | /* Check hooks all assigned */ | |
1752 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1753 | /* Only hooks which are valid */ | |
1754 | if (!(valid_hooks & (1 << i))) | |
1755 | continue; | |
1756 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1757 | duprintf("Invalid hook entry %u %u\n", | |
1758 | i, hook_entries[i]); | |
1759 | goto out_unlock; | |
1760 | } | |
1761 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1762 | duprintf("Invalid underflow %u %u\n", | |
1763 | i, underflows[i]); | |
1764 | goto out_unlock; | |
1765 | } | |
1766 | } | |
1767 | ||
1768 | ret = -ENOMEM; | |
1769 | newinfo = xt_alloc_table_info(size); | |
1770 | if (!newinfo) | |
1771 | goto out_unlock; | |
1772 | ||
1773 | newinfo->number = number; | |
1774 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1775 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1776 | newinfo->underflow[i] = info->underflow[i]; | |
1777 | } | |
1778 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1779 | pos = entry1; | |
1780 | size = total_size; | |
72b2b1dd JE |
1781 | xt_entry_foreach(iter0, entry0, total_size) { |
1782 | ret = compat_copy_entry_from_user(iter0, &pos, | |
1783 | &size, name, newinfo, entry1); | |
1784 | if (ret != 0) | |
1785 | break; | |
1786 | } | |
3bc3fe5e PM |
1787 | xt_compat_flush_offsets(AF_INET6); |
1788 | xt_compat_unlock(AF_INET6); | |
1789 | if (ret) | |
1790 | goto free_newinfo; | |
1791 | ||
1792 | ret = -ELOOP; | |
1793 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1794 | goto free_newinfo; | |
1795 | ||
1796 | i = 0; | |
72b2b1dd | 1797 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1798 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1799 | if (ret != 0) |
1800 | break; | |
0559518b | 1801 | ++i; |
72b2b1dd | 1802 | } |
3bc3fe5e | 1803 | if (ret) { |
72b2b1dd JE |
1804 | /* |
1805 | * The first i matches need cleanup_entry (calls ->destroy) | |
1806 | * because they had called ->check already. The other j-i | |
1807 | * entries need only release. | |
1808 | */ | |
1809 | int skip = i; | |
3bc3fe5e | 1810 | j -= i; |
72b2b1dd JE |
1811 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1812 | if (skip-- > 0) | |
1813 | continue; | |
0559518b | 1814 | if (j-- == 0) |
72b2b1dd | 1815 | break; |
0559518b | 1816 | compat_release_entry(iter0); |
72b2b1dd | 1817 | } |
0559518b JE |
1818 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1819 | if (i-- == 0) | |
72b2b1dd | 1820 | break; |
0559518b JE |
1821 | cleanup_entry(iter1, net); |
1822 | } | |
3bc3fe5e PM |
1823 | xt_free_table_info(newinfo); |
1824 | return ret; | |
1825 | } | |
1826 | ||
1827 | /* And one copy for every other CPU */ | |
1828 | for_each_possible_cpu(i) | |
1829 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1830 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1831 | ||
1832 | *pinfo = newinfo; | |
1833 | *pentry0 = entry1; | |
1834 | xt_free_table_info(info); | |
1835 | return 0; | |
1836 | ||
1837 | free_newinfo: | |
1838 | xt_free_table_info(newinfo); | |
1839 | out: | |
0559518b JE |
1840 | xt_entry_foreach(iter0, entry0, total_size) { |
1841 | if (j-- == 0) | |
72b2b1dd | 1842 | break; |
0559518b JE |
1843 | compat_release_entry(iter0); |
1844 | } | |
3bc3fe5e PM |
1845 | return ret; |
1846 | out_unlock: | |
1847 | xt_compat_flush_offsets(AF_INET6); | |
1848 | xt_compat_unlock(AF_INET6); | |
1849 | goto out; | |
1850 | } | |
1851 | ||
1852 | static int | |
336b517f | 1853 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1854 | { |
1855 | int ret; | |
1856 | struct compat_ip6t_replace tmp; | |
1857 | struct xt_table_info *newinfo; | |
1858 | void *loc_cpu_entry; | |
72b2b1dd | 1859 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1860 | |
1861 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1862 | return -EFAULT; | |
1863 | ||
1864 | /* overflow check */ | |
1865 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1866 | return -ENOMEM; | |
1867 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1868 | return -ENOMEM; | |
1869 | ||
1870 | newinfo = xt_alloc_table_info(tmp.size); | |
1871 | if (!newinfo) | |
1872 | return -ENOMEM; | |
1873 | ||
9c547959 | 1874 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1875 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1876 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1877 | tmp.size) != 0) { | |
1878 | ret = -EFAULT; | |
1879 | goto free_newinfo; | |
1880 | } | |
1881 | ||
f54e9367 | 1882 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1883 | &newinfo, &loc_cpu_entry, tmp.size, |
1884 | tmp.num_entries, tmp.hook_entry, | |
1885 | tmp.underflow); | |
1886 | if (ret != 0) | |
1887 | goto free_newinfo; | |
1888 | ||
1889 | duprintf("compat_do_replace: Translated table\n"); | |
1890 | ||
336b517f | 1891 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1892 | tmp.num_counters, compat_ptr(tmp.counters)); |
1893 | if (ret) | |
1894 | goto free_newinfo_untrans; | |
1895 | return 0; | |
1896 | ||
1897 | free_newinfo_untrans: | |
72b2b1dd | 1898 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1899 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1900 | free_newinfo: |
1901 | xt_free_table_info(newinfo); | |
1902 | return ret; | |
1903 | } | |
1904 | ||
1905 | static int | |
1906 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1907 | unsigned int len) | |
1908 | { | |
1909 | int ret; | |
1910 | ||
1911 | if (!capable(CAP_NET_ADMIN)) | |
1912 | return -EPERM; | |
1913 | ||
1914 | switch (cmd) { | |
1915 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1916 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1917 | break; |
1918 | ||
1919 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1920 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1921 | break; |
1922 | ||
1923 | default: | |
1924 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1925 | ret = -EINVAL; | |
1926 | } | |
1927 | ||
1928 | return ret; | |
1929 | } | |
1930 | ||
1931 | struct compat_ip6t_get_entries { | |
1932 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1933 | compat_uint_t size; | |
1934 | struct compat_ip6t_entry entrytable[0]; | |
1935 | }; | |
1936 | ||
1937 | static int | |
1938 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1939 | void __user *userptr) | |
1940 | { | |
1941 | struct xt_counters *counters; | |
5452e425 | 1942 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1943 | void __user *pos; |
1944 | unsigned int size; | |
1945 | int ret = 0; | |
5452e425 | 1946 | const void *loc_cpu_entry; |
3bc3fe5e | 1947 | unsigned int i = 0; |
72b2b1dd | 1948 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1949 | |
1950 | counters = alloc_counters(table); | |
1951 | if (IS_ERR(counters)) | |
1952 | return PTR_ERR(counters); | |
1953 | ||
1954 | /* choose the copy that is on our node/cpu, ... | |
1955 | * This choice is lazy (because current thread is | |
1956 | * allowed to migrate to another cpu) | |
1957 | */ | |
1958 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1959 | pos = userptr; | |
1960 | size = total_size; | |
72b2b1dd JE |
1961 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1962 | ret = compat_copy_entry_to_user(iter, &pos, | |
0559518b | 1963 | &size, counters, i++); |
72b2b1dd JE |
1964 | if (ret != 0) |
1965 | break; | |
1966 | } | |
3bc3fe5e PM |
1967 | |
1968 | vfree(counters); | |
1969 | return ret; | |
1970 | } | |
1971 | ||
1972 | static int | |
336b517f AD |
1973 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1974 | int *len) | |
3bc3fe5e PM |
1975 | { |
1976 | int ret; | |
1977 | struct compat_ip6t_get_entries get; | |
1978 | struct xt_table *t; | |
1979 | ||
1980 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1981 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1982 | return -EINVAL; |
1983 | } | |
1984 | ||
1985 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1986 | return -EFAULT; | |
1987 | ||
1988 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1989 | duprintf("compat_get_entries: %u != %zu\n", |
1990 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1991 | return -EINVAL; |
1992 | } | |
1993 | ||
1994 | xt_compat_lock(AF_INET6); | |
336b517f | 1995 | t = xt_find_table_lock(net, AF_INET6, get.name); |
3bc3fe5e | 1996 | if (t && !IS_ERR(t)) { |
5452e425 | 1997 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1998 | struct xt_table_info info; |
9c547959 | 1999 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
2000 | ret = compat_table_info(private, &info); |
2001 | if (!ret && get.size == info.size) { | |
2002 | ret = compat_copy_entries_to_user(private->size, | |
2003 | t, uptr->entrytable); | |
2004 | } else if (!ret) { | |
2005 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 2006 | private->size, get.size); |
544473c1 | 2007 | ret = -EAGAIN; |
3bc3fe5e PM |
2008 | } |
2009 | xt_compat_flush_offsets(AF_INET6); | |
2010 | module_put(t->me); | |
2011 | xt_table_unlock(t); | |
2012 | } else | |
2013 | ret = t ? PTR_ERR(t) : -ENOENT; | |
2014 | ||
2015 | xt_compat_unlock(AF_INET6); | |
2016 | return ret; | |
2017 | } | |
2018 | ||
2019 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
2020 | ||
2021 | static int | |
2022 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2023 | { | |
2024 | int ret; | |
2025 | ||
2026 | if (!capable(CAP_NET_ADMIN)) | |
2027 | return -EPERM; | |
2028 | ||
2029 | switch (cmd) { | |
2030 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 2031 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
2032 | break; |
2033 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 2034 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
2035 | break; |
2036 | default: | |
2037 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
2038 | } | |
2039 | return ret; | |
2040 | } | |
2041 | #endif | |
2042 | ||
1da177e4 LT |
2043 | static int |
2044 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2045 | { | |
2046 | int ret; | |
2047 | ||
2048 | if (!capable(CAP_NET_ADMIN)) | |
2049 | return -EPERM; | |
2050 | ||
2051 | switch (cmd) { | |
2052 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2053 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2054 | break; |
2055 | ||
2056 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2057 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2058 | break; |
2059 | ||
2060 | default: | |
2061 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2062 | ret = -EINVAL; | |
2063 | } | |
2064 | ||
2065 | return ret; | |
2066 | } | |
2067 | ||
2068 | static int | |
2069 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2070 | { | |
2071 | int ret; | |
2072 | ||
2073 | if (!capable(CAP_NET_ADMIN)) | |
2074 | return -EPERM; | |
2075 | ||
2076 | switch (cmd) { | |
433665c9 | 2077 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2078 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2079 | break; |
1da177e4 | 2080 | |
d924357c | 2081 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2082 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2083 | break; |
1da177e4 | 2084 | |
6b7d31fc HW |
2085 | case IP6T_SO_GET_REVISION_MATCH: |
2086 | case IP6T_SO_GET_REVISION_TARGET: { | |
2087 | struct ip6t_get_revision rev; | |
2e4e6a17 | 2088 | int target; |
6b7d31fc HW |
2089 | |
2090 | if (*len != sizeof(rev)) { | |
2091 | ret = -EINVAL; | |
2092 | break; | |
2093 | } | |
2094 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2095 | ret = -EFAULT; | |
2096 | break; | |
2097 | } | |
2098 | ||
2099 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2100 | target = 1; |
6b7d31fc | 2101 | else |
2e4e6a17 | 2102 | target = 0; |
6b7d31fc | 2103 | |
2e4e6a17 HW |
2104 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2105 | rev.revision, | |
2106 | target, &ret), | |
6b7d31fc HW |
2107 | "ip6t_%s", rev.name); |
2108 | break; | |
2109 | } | |
2110 | ||
1da177e4 LT |
2111 | default: |
2112 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2113 | ret = -EINVAL; | |
2114 | } | |
2115 | ||
2116 | return ret; | |
2117 | } | |
2118 | ||
35aad0ff JE |
2119 | struct xt_table *ip6t_register_table(struct net *net, |
2120 | const struct xt_table *table, | |
336b517f | 2121 | const struct ip6t_replace *repl) |
1da177e4 LT |
2122 | { |
2123 | int ret; | |
2e4e6a17 | 2124 | struct xt_table_info *newinfo; |
259d4e41 | 2125 | struct xt_table_info bootstrap |
1da177e4 | 2126 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2127 | void *loc_cpu_entry; |
a98da11d | 2128 | struct xt_table *new_table; |
1da177e4 | 2129 | |
2e4e6a17 | 2130 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2131 | if (!newinfo) { |
2132 | ret = -ENOMEM; | |
2133 | goto out; | |
2134 | } | |
1da177e4 | 2135 | |
9c547959 | 2136 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2137 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2138 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2139 | |
0f234214 | 2140 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2141 | if (ret != 0) |
2142 | goto out_free; | |
1da177e4 | 2143 | |
336b517f | 2144 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2145 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2146 | ret = PTR_ERR(new_table); |
2147 | goto out_free; | |
1da177e4 | 2148 | } |
44d34e72 | 2149 | return new_table; |
1da177e4 | 2150 | |
44d34e72 AD |
2151 | out_free: |
2152 | xt_free_table_info(newinfo); | |
2153 | out: | |
2154 | return ERR_PTR(ret); | |
1da177e4 LT |
2155 | } |
2156 | ||
f54e9367 | 2157 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2158 | { |
2e4e6a17 | 2159 | struct xt_table_info *private; |
31836064 | 2160 | void *loc_cpu_entry; |
df200969 | 2161 | struct module *table_owner = table->me; |
72b2b1dd | 2162 | struct ip6t_entry *iter; |
31836064 | 2163 | |
2e4e6a17 | 2164 | private = xt_unregister_table(table); |
1da177e4 LT |
2165 | |
2166 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2167 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2168 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2169 | cleanup_entry(iter, net); |
df200969 AD |
2170 | if (private->number > private->initial_entries) |
2171 | module_put(table_owner); | |
2e4e6a17 | 2172 | xt_free_table_info(private); |
1da177e4 LT |
2173 | } |
2174 | ||
2175 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2176 | static inline bool |
1da177e4 LT |
2177 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2178 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2179 | bool invert) |
1da177e4 LT |
2180 | { |
2181 | return (type == test_type && code >= min_code && code <= max_code) | |
2182 | ^ invert; | |
2183 | } | |
2184 | ||
1d93a9cb | 2185 | static bool |
f7108a20 | 2186 | icmp6_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2187 | { |
5452e425 JE |
2188 | const struct icmp6hdr *ic; |
2189 | struct icmp6hdr _icmph; | |
f7108a20 | 2190 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2191 | |
2192 | /* Must not be a fragment. */ | |
f7108a20 | 2193 | if (par->fragoff != 0) |
1d93a9cb | 2194 | return false; |
1da177e4 | 2195 | |
f7108a20 | 2196 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2197 | if (ic == NULL) { |
2198 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2199 | * can't. Hence, no choice but to drop. |
2200 | */ | |
1da177e4 | 2201 | duprintf("Dropping evil ICMP tinygram.\n"); |
f7108a20 | 2202 | *par->hotdrop = true; |
1d93a9cb | 2203 | return false; |
1da177e4 LT |
2204 | } |
2205 | ||
2206 | return icmp6_type_code_match(icmpinfo->type, | |
2207 | icmpinfo->code[0], | |
2208 | icmpinfo->code[1], | |
2209 | ic->icmp6_type, ic->icmp6_code, | |
2210 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2211 | } | |
2212 | ||
2213 | /* Called when user tries to insert an entry of this type. */ | |
9b4fce7a | 2214 | static bool icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2215 | { |
9b4fce7a | 2216 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2217 | |
7f939713 PM |
2218 | /* Must specify no unknown invflags */ |
2219 | return !(icmpinfo->invflags & ~IP6T_ICMP_INV); | |
1da177e4 LT |
2220 | } |
2221 | ||
2222 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2223 | static struct xt_target ip6t_standard_target __read_mostly = { |
1da177e4 | 2224 | .name = IP6T_STANDARD_TARGET, |
7f939713 | 2225 | .targetsize = sizeof(int), |
4ba351cf | 2226 | .family = NFPROTO_IPV6, |
3bc3fe5e PM |
2227 | #ifdef CONFIG_COMPAT |
2228 | .compatsize = sizeof(compat_int_t), | |
2229 | .compat_from_user = compat_standard_from_user, | |
2230 | .compat_to_user = compat_standard_to_user, | |
2231 | #endif | |
1da177e4 LT |
2232 | }; |
2233 | ||
9f15c530 | 2234 | static struct xt_target ip6t_error_target __read_mostly = { |
1da177e4 LT |
2235 | .name = IP6T_ERROR_TARGET, |
2236 | .target = ip6t_error, | |
7f939713 | 2237 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, |
4ba351cf | 2238 | .family = NFPROTO_IPV6, |
1da177e4 LT |
2239 | }; |
2240 | ||
2241 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2242 | .pf = PF_INET6, | |
2243 | .set_optmin = IP6T_BASE_CTL, | |
2244 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2245 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2246 | #ifdef CONFIG_COMPAT |
2247 | .compat_set = compat_do_ip6t_set_ctl, | |
2248 | #endif | |
1da177e4 LT |
2249 | .get_optmin = IP6T_BASE_CTL, |
2250 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2251 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2252 | #ifdef CONFIG_COMPAT |
2253 | .compat_get = compat_do_ip6t_get_ctl, | |
2254 | #endif | |
16fcec35 | 2255 | .owner = THIS_MODULE, |
1da177e4 LT |
2256 | }; |
2257 | ||
9f15c530 | 2258 | static struct xt_match icmp6_matchstruct __read_mostly = { |
1da177e4 | 2259 | .name = "icmp6", |
9c547959 | 2260 | .match = icmp6_match, |
7f939713 PM |
2261 | .matchsize = sizeof(struct ip6t_icmp), |
2262 | .checkentry = icmp6_checkentry, | |
2263 | .proto = IPPROTO_ICMPV6, | |
4ba351cf | 2264 | .family = NFPROTO_IPV6, |
1da177e4 LT |
2265 | }; |
2266 | ||
3cb609d5 AD |
2267 | static int __net_init ip6_tables_net_init(struct net *net) |
2268 | { | |
383ca5b8 | 2269 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2270 | } |
2271 | ||
2272 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2273 | { | |
383ca5b8 | 2274 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2275 | } |
2276 | ||
2277 | static struct pernet_operations ip6_tables_net_ops = { | |
2278 | .init = ip6_tables_net_init, | |
2279 | .exit = ip6_tables_net_exit, | |
2280 | }; | |
2281 | ||
65b4b4e8 | 2282 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2283 | { |
2284 | int ret; | |
2285 | ||
3cb609d5 | 2286 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2287 | if (ret < 0) |
2288 | goto err1; | |
2e4e6a17 | 2289 | |
1da177e4 | 2290 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2291 | ret = xt_register_target(&ip6t_standard_target); |
2292 | if (ret < 0) | |
2293 | goto err2; | |
2294 | ret = xt_register_target(&ip6t_error_target); | |
2295 | if (ret < 0) | |
2296 | goto err3; | |
2297 | ret = xt_register_match(&icmp6_matchstruct); | |
2298 | if (ret < 0) | |
2299 | goto err4; | |
1da177e4 LT |
2300 | |
2301 | /* Register setsockopt */ | |
2302 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2303 | if (ret < 0) |
2304 | goto err5; | |
1da177e4 | 2305 | |
a887c1c1 | 2306 | printk(KERN_INFO "ip6_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2307 | return 0; |
0eff66e6 PM |
2308 | |
2309 | err5: | |
2310 | xt_unregister_match(&icmp6_matchstruct); | |
2311 | err4: | |
2312 | xt_unregister_target(&ip6t_error_target); | |
2313 | err3: | |
2314 | xt_unregister_target(&ip6t_standard_target); | |
2315 | err2: | |
3cb609d5 | 2316 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2317 | err1: |
2318 | return ret; | |
1da177e4 LT |
2319 | } |
2320 | ||
65b4b4e8 | 2321 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2322 | { |
2323 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2324 | |
a45049c5 PNA |
2325 | xt_unregister_match(&icmp6_matchstruct); |
2326 | xt_unregister_target(&ip6t_error_target); | |
2327 | xt_unregister_target(&ip6t_standard_target); | |
3cb609d5 AD |
2328 | |
2329 | unregister_pernet_subsys(&ip6_tables_net_ops); | |
1da177e4 LT |
2330 | } |
2331 | ||
e674d0f3 | 2332 | /* |
b777e0ce PM |
2333 | * find the offset to specified header or the protocol number of last header |
2334 | * if target < 0. "last header" is transport protocol header, ESP, or | |
2335 | * "No next header". | |
2336 | * | |
2337 | * If target header is found, its offset is set in *offset and return protocol | |
2338 | * number. Otherwise, return -1. | |
2339 | * | |
6d381634 PM |
2340 | * If the first fragment doesn't contain the final protocol header or |
2341 | * NEXTHDR_NONE it is considered invalid. | |
2342 | * | |
b777e0ce PM |
2343 | * Note that non-1st fragment is special case that "the protocol number |
2344 | * of last header" is "next header" field in Fragment header. In this case, | |
2345 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
2346 | * isn't NULL. | |
e674d0f3 | 2347 | * |
e674d0f3 | 2348 | */ |
b777e0ce PM |
2349 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
2350 | int target, unsigned short *fragoff) | |
e674d0f3 | 2351 | { |
6b88dd96 | 2352 | unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); |
0660e03f | 2353 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
e674d0f3 YK |
2354 | unsigned int len = skb->len - start; |
2355 | ||
b777e0ce PM |
2356 | if (fragoff) |
2357 | *fragoff = 0; | |
2358 | ||
e674d0f3 YK |
2359 | while (nexthdr != target) { |
2360 | struct ipv6_opt_hdr _hdr, *hp; | |
2361 | unsigned int hdrlen; | |
2362 | ||
b777e0ce PM |
2363 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
2364 | if (target < 0) | |
2365 | break; | |
6d381634 | 2366 | return -ENOENT; |
b777e0ce PM |
2367 | } |
2368 | ||
e674d0f3 YK |
2369 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
2370 | if (hp == NULL) | |
6d381634 | 2371 | return -EBADMSG; |
e674d0f3 | 2372 | if (nexthdr == NEXTHDR_FRAGMENT) { |
e69a4adc AV |
2373 | unsigned short _frag_off; |
2374 | __be16 *fp; | |
e674d0f3 YK |
2375 | fp = skb_header_pointer(skb, |
2376 | start+offsetof(struct frag_hdr, | |
2377 | frag_off), | |
2378 | sizeof(_frag_off), | |
2379 | &_frag_off); | |
2380 | if (fp == NULL) | |
6d381634 | 2381 | return -EBADMSG; |
e674d0f3 | 2382 | |
b777e0ce PM |
2383 | _frag_off = ntohs(*fp) & ~0x7; |
2384 | if (_frag_off) { | |
2385 | if (target < 0 && | |
2386 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
337dde79 | 2387 | hp->nexthdr == NEXTHDR_NONE)) { |
b777e0ce PM |
2388 | if (fragoff) |
2389 | *fragoff = _frag_off; | |
2390 | return hp->nexthdr; | |
2391 | } | |
6d381634 | 2392 | return -ENOENT; |
b777e0ce | 2393 | } |
e674d0f3 YK |
2394 | hdrlen = 8; |
2395 | } else if (nexthdr == NEXTHDR_AUTH) | |
1ab1457c | 2396 | hdrlen = (hp->hdrlen + 2) << 2; |
e674d0f3 | 2397 | else |
1ab1457c | 2398 | hdrlen = ipv6_optlen(hp); |
e674d0f3 YK |
2399 | |
2400 | nexthdr = hp->nexthdr; | |
2401 | len -= hdrlen; | |
2402 | start += hdrlen; | |
2403 | } | |
2404 | ||
2405 | *offset = start; | |
b777e0ce | 2406 | return nexthdr; |
e674d0f3 YK |
2407 | } |
2408 | ||
1da177e4 LT |
2409 | EXPORT_SYMBOL(ip6t_register_table); |
2410 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2411 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2412 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 2413 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 2414 | |
65b4b4e8 AM |
2415 | module_init(ip6_tables_init); |
2416 | module_exit(ip6_tables_fini); |