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; |
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, |
9452258d JE |
400 | &mtpar.thoff, &mtpar.fragoff, &hotdrop) || |
401 | IP6T_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) { | |
a1ff4ac8 JE |
402 | e = ip6t_next_entry(e); |
403 | continue; | |
404 | } | |
1da177e4 | 405 | |
a1ff4ac8 JE |
406 | ADD_COUNTER(e->counters, |
407 | ntohs(ipv6_hdr(skb)->payload_len) + | |
408 | sizeof(struct ipv6hdr), 1); | |
1da177e4 | 409 | |
d5d1baa1 | 410 | t = ip6t_get_target_c(e); |
a1ff4ac8 | 411 | IP_NF_ASSERT(t->u.kernel.target); |
ba9dda3a JK |
412 | |
413 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
414 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
a1ff4ac8 JE |
415 | /* The packet is traced: log it */ |
416 | if (unlikely(skb->nf_trace)) | |
417 | trace_packet(skb, hook, in, out, | |
418 | table->name, private, e); | |
ba9dda3a | 419 | #endif |
a1ff4ac8 JE |
420 | /* Standard target? */ |
421 | if (!t->u.kernel.target->target) { | |
422 | int v; | |
423 | ||
424 | v = ((struct ip6t_standard_target *)t)->verdict; | |
425 | if (v < 0) { | |
426 | /* Pop from stack? */ | |
427 | if (v != IP6T_RETURN) { | |
428 | verdict = (unsigned)(-v) - 1; | |
429 | break; | |
1da177e4 | 430 | } |
a1ff4ac8 JE |
431 | e = back; |
432 | back = get_entry(table_base, back->comefrom); | |
433 | continue; | |
434 | } | |
3666ed1c JP |
435 | if (table_base + v != ip6t_next_entry(e) && |
436 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
a1ff4ac8 JE |
437 | /* Save old back ptr in next entry */ |
438 | struct ip6t_entry *next = ip6t_next_entry(e); | |
439 | next->comefrom = (void *)back - table_base; | |
440 | /* set back pointer to next entry */ | |
441 | back = next; | |
442 | } | |
1da177e4 | 443 | |
a1ff4ac8 | 444 | e = get_entry(table_base, v); |
7a6b1c46 JE |
445 | continue; |
446 | } | |
447 | ||
448 | /* Targets which reenter must return | |
449 | abs. verdicts */ | |
450 | tgpar.target = t->u.kernel.target; | |
451 | tgpar.targinfo = t->data; | |
7eb35586 | 452 | |
1da177e4 | 453 | #ifdef CONFIG_NETFILTER_DEBUG |
bb70dfa5 | 454 | tb_comefrom = 0xeeeeeeec; |
1da177e4 | 455 | #endif |
7a6b1c46 | 456 | verdict = t->u.kernel.target->target(skb, &tgpar); |
1da177e4 LT |
457 | |
458 | #ifdef CONFIG_NETFILTER_DEBUG | |
bb70dfa5 | 459 | if (tb_comefrom != 0xeeeeeeec && verdict == IP6T_CONTINUE) { |
7a6b1c46 JE |
460 | printk("Target %s reentered!\n", |
461 | t->u.kernel.target->name); | |
462 | verdict = NF_DROP; | |
1da177e4 | 463 | } |
bb70dfa5 | 464 | tb_comefrom = 0x57acc001; |
7a6b1c46 JE |
465 | #endif |
466 | if (verdict == IP6T_CONTINUE) | |
467 | e = ip6t_next_entry(e); | |
468 | else | |
469 | /* Verdict */ | |
470 | break; | |
1da177e4 LT |
471 | } while (!hotdrop); |
472 | ||
473 | #ifdef CONFIG_NETFILTER_DEBUG | |
bb70dfa5 | 474 | tb_comefrom = NETFILTER_LINK_POISON; |
1da177e4 | 475 | #endif |
942e4a2b | 476 | xt_info_rdunlock_bh(); |
1da177e4 LT |
477 | |
478 | #ifdef DEBUG_ALLOW_ALL | |
479 | return NF_ACCEPT; | |
480 | #else | |
481 | if (hotdrop) | |
482 | return NF_DROP; | |
483 | else return verdict; | |
484 | #endif | |
bb70dfa5 JE |
485 | |
486 | #undef tb_comefrom | |
1da177e4 LT |
487 | } |
488 | ||
1da177e4 LT |
489 | /* Figures out from what hook each rule can be called: returns 0 if |
490 | there are loops. Puts hook bitmask in comefrom. */ | |
491 | static int | |
d5d1baa1 | 492 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 493 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
494 | { |
495 | unsigned int hook; | |
496 | ||
497 | /* No recursion; use packet counter to save back ptrs (reset | |
498 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 499 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 500 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 501 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
502 | |
503 | if (!(valid_hooks & (1 << hook))) | |
504 | continue; | |
505 | ||
506 | /* Set initial back pointer. */ | |
507 | e->counters.pcnt = pos; | |
508 | ||
509 | for (;;) { | |
d5d1baa1 JE |
510 | const struct ip6t_standard_target *t |
511 | = (void *)ip6t_get_target_c(e); | |
9c547959 | 512 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 513 | |
6e23ae2a | 514 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
515 | printk("iptables: loop hook %u pos %u %08X.\n", |
516 | hook, pos, e->comefrom); | |
517 | return 0; | |
518 | } | |
9c547959 | 519 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
520 | |
521 | /* Unconditional return/END. */ | |
3666ed1c JP |
522 | if ((e->target_offset == sizeof(struct ip6t_entry) && |
523 | (strcmp(t->target.u.user.name, | |
524 | IP6T_STANDARD_TARGET) == 0) && | |
525 | t->verdict < 0 && | |
526 | unconditional(&e->ipv6)) || visited) { | |
1da177e4 LT |
527 | unsigned int oldpos, size; |
528 | ||
1f9352ae PM |
529 | if ((strcmp(t->target.u.user.name, |
530 | IP6T_STANDARD_TARGET) == 0) && | |
531 | t->verdict < -NF_MAX_VERDICT - 1) { | |
74c9c0c1 DM |
532 | duprintf("mark_source_chains: bad " |
533 | "negative verdict (%i)\n", | |
534 | t->verdict); | |
535 | return 0; | |
536 | } | |
537 | ||
1da177e4 LT |
538 | /* Return: backtrack through the last |
539 | big jump. */ | |
540 | do { | |
6e23ae2a | 541 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
542 | #ifdef DEBUG_IP_FIREWALL_USER |
543 | if (e->comefrom | |
6e23ae2a | 544 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
545 | duprintf("Back unset " |
546 | "on hook %u " | |
547 | "rule %u\n", | |
548 | hook, pos); | |
549 | } | |
550 | #endif | |
551 | oldpos = pos; | |
552 | pos = e->counters.pcnt; | |
553 | e->counters.pcnt = 0; | |
554 | ||
555 | /* We're at the start. */ | |
556 | if (pos == oldpos) | |
557 | goto next; | |
558 | ||
559 | e = (struct ip6t_entry *) | |
31836064 | 560 | (entry0 + pos); |
1da177e4 LT |
561 | } while (oldpos == pos + e->next_offset); |
562 | ||
563 | /* Move along one */ | |
564 | size = e->next_offset; | |
565 | e = (struct ip6t_entry *) | |
31836064 | 566 | (entry0 + pos + size); |
1da177e4 LT |
567 | e->counters.pcnt = pos; |
568 | pos += size; | |
569 | } else { | |
570 | int newpos = t->verdict; | |
571 | ||
572 | if (strcmp(t->target.u.user.name, | |
3666ed1c JP |
573 | IP6T_STANDARD_TARGET) == 0 && |
574 | newpos >= 0) { | |
74c9c0c1 DM |
575 | if (newpos > newinfo->size - |
576 | sizeof(struct ip6t_entry)) { | |
577 | duprintf("mark_source_chains: " | |
578 | "bad verdict (%i)\n", | |
579 | newpos); | |
580 | return 0; | |
581 | } | |
1da177e4 LT |
582 | /* This a jump; chase it. */ |
583 | duprintf("Jump rule %u -> %u\n", | |
584 | pos, newpos); | |
585 | } else { | |
586 | /* ... this is a fallthru */ | |
587 | newpos = pos + e->next_offset; | |
588 | } | |
589 | e = (struct ip6t_entry *) | |
31836064 | 590 | (entry0 + newpos); |
1da177e4 LT |
591 | e->counters.pcnt = pos; |
592 | pos = newpos; | |
593 | } | |
594 | } | |
595 | next: | |
596 | duprintf("Finished chain %u\n", hook); | |
597 | } | |
598 | return 1; | |
599 | } | |
600 | ||
022748a9 | 601 | static int |
f54e9367 | 602 | cleanup_match(struct ip6t_entry_match *m, struct net *net, unsigned int *i) |
1da177e4 | 603 | { |
6be3d859 JE |
604 | struct xt_mtdtor_param par; |
605 | ||
1da177e4 LT |
606 | if (i && (*i)-- == 0) |
607 | return 1; | |
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 | return 0; |
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 | ||
9b4fce7a JE |
640 | static int check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par, |
641 | unsigned int *i) | |
f173c8a1 | 642 | { |
9b4fce7a | 643 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
644 | int ret; |
645 | ||
9b4fce7a JE |
646 | par->match = m->u.kernel.match; |
647 | par->matchinfo = m->data; | |
648 | ||
916a917d | 649 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 650 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
367c6790 | 651 | if (ret < 0) { |
f173c8a1 | 652 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 653 | par.match->name); |
367c6790 | 654 | return ret; |
f173c8a1 | 655 | } |
367c6790 JE |
656 | ++*i; |
657 | return 0; | |
f173c8a1 PM |
658 | } |
659 | ||
022748a9 | 660 | static int |
9b4fce7a | 661 | find_check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par, |
f173c8a1 | 662 | unsigned int *i) |
1da177e4 | 663 | { |
6709dbbb | 664 | struct xt_match *match; |
3cdc7c95 | 665 | int ret; |
1da177e4 | 666 | |
2e4e6a17 | 667 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, |
9c547959 | 668 | m->u.user.revision), |
6b7d31fc HW |
669 | "ip6t_%s", m->u.user.name); |
670 | if (IS_ERR(match) || !match) { | |
f173c8a1 | 671 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
6b7d31fc | 672 | return match ? PTR_ERR(match) : -ENOENT; |
1da177e4 LT |
673 | } |
674 | m->u.kernel.match = match; | |
1da177e4 | 675 | |
9b4fce7a | 676 | ret = check_match(m, par, i); |
3cdc7c95 PM |
677 | if (ret) |
678 | goto err; | |
679 | ||
1da177e4 | 680 | return 0; |
3cdc7c95 PM |
681 | err: |
682 | module_put(m->u.kernel.match->me); | |
683 | return ret; | |
1da177e4 LT |
684 | } |
685 | ||
add67461 | 686 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 687 | { |
af5d6dc2 JE |
688 | struct ip6t_entry_target *t = ip6t_get_target(e); |
689 | struct xt_tgchk_param par = { | |
add67461 | 690 | .net = net, |
af5d6dc2 JE |
691 | .table = name, |
692 | .entryinfo = e, | |
693 | .target = t->u.kernel.target, | |
694 | .targinfo = t->data, | |
695 | .hook_mask = e->comefrom, | |
916a917d | 696 | .family = NFPROTO_IPV6, |
af5d6dc2 | 697 | }; |
1da177e4 | 698 | int ret; |
1da177e4 | 699 | |
f173c8a1 | 700 | t = ip6t_get_target(e); |
916a917d | 701 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 702 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
367c6790 | 703 | if (ret < 0) { |
f173c8a1 PM |
704 | duprintf("ip_tables: check failed for `%s'.\n", |
705 | t->u.kernel.target->name); | |
367c6790 | 706 | return ret; |
1da177e4 | 707 | } |
367c6790 | 708 | return 0; |
f173c8a1 | 709 | } |
1da177e4 | 710 | |
022748a9 | 711 | static int |
a83d8e8d | 712 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
0559518b | 713 | unsigned int size) |
f173c8a1 PM |
714 | { |
715 | struct ip6t_entry_target *t; | |
716 | struct xt_target *target; | |
717 | int ret; | |
718 | unsigned int j; | |
9b4fce7a | 719 | struct xt_mtchk_param mtpar; |
f173c8a1 PM |
720 | |
721 | ret = check_entry(e, name); | |
722 | if (ret) | |
723 | return ret; | |
590bdf7f | 724 | |
1da177e4 | 725 | j = 0; |
a83d8e8d | 726 | mtpar.net = net; |
9b4fce7a JE |
727 | mtpar.table = name; |
728 | mtpar.entryinfo = &e->ipv6; | |
729 | mtpar.hook_mask = e->comefrom; | |
916a917d | 730 | mtpar.family = NFPROTO_IPV6; |
9b4fce7a | 731 | ret = IP6T_MATCH_ITERATE(e, find_check_match, &mtpar, &j); |
1da177e4 LT |
732 | if (ret != 0) |
733 | goto cleanup_matches; | |
734 | ||
735 | t = ip6t_get_target(e); | |
2e4e6a17 HW |
736 | target = try_then_request_module(xt_find_target(AF_INET6, |
737 | t->u.user.name, | |
738 | t->u.user.revision), | |
6b7d31fc HW |
739 | "ip6t_%s", t->u.user.name); |
740 | if (IS_ERR(target) || !target) { | |
f173c8a1 | 741 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
6b7d31fc | 742 | ret = target ? PTR_ERR(target) : -ENOENT; |
1da177e4 LT |
743 | goto cleanup_matches; |
744 | } | |
745 | t->u.kernel.target = target; | |
6b7d31fc | 746 | |
add67461 | 747 | ret = check_target(e, net, name); |
3cdc7c95 PM |
748 | if (ret) |
749 | goto err; | |
1da177e4 | 750 | return 0; |
3cdc7c95 PM |
751 | err: |
752 | module_put(t->u.kernel.target->me); | |
1da177e4 | 753 | cleanup_matches: |
f54e9367 | 754 | IP6T_MATCH_ITERATE(e, cleanup_match, net, &j); |
1da177e4 LT |
755 | return ret; |
756 | } | |
757 | ||
d5d1baa1 | 758 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 JE |
759 | { |
760 | const struct ip6t_entry_target *t; | |
761 | unsigned int verdict; | |
762 | ||
763 | if (!unconditional(&e->ipv6)) | |
764 | return false; | |
d5d1baa1 | 765 | t = ip6t_get_target_c(e); |
e2fe35c1 JE |
766 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
767 | return false; | |
768 | verdict = ((struct ip6t_standard_target *)t)->verdict; | |
769 | verdict = -verdict - 1; | |
770 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
771 | } | |
772 | ||
022748a9 | 773 | static int |
1da177e4 | 774 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 775 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
776 | const unsigned char *base, |
777 | const unsigned char *limit, | |
1da177e4 LT |
778 | const unsigned int *hook_entries, |
779 | const unsigned int *underflows, | |
0559518b | 780 | unsigned int valid_hooks) |
1da177e4 LT |
781 | { |
782 | unsigned int h; | |
783 | ||
3666ed1c JP |
784 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
785 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
1da177e4 LT |
786 | duprintf("Bad offset %p\n", e); |
787 | return -EINVAL; | |
788 | } | |
789 | ||
790 | if (e->next_offset | |
791 | < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) { | |
792 | duprintf("checking: element %p size %u\n", | |
793 | e, e->next_offset); | |
794 | return -EINVAL; | |
795 | } | |
796 | ||
797 | /* Check hooks & underflows */ | |
6e23ae2a | 798 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
799 | if (!(valid_hooks & (1 << h))) |
800 | continue; | |
1da177e4 LT |
801 | if ((unsigned char *)e - base == hook_entries[h]) |
802 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 803 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
804 | if (!check_underflow(e)) { |
805 | pr_err("Underflows must be unconditional and " | |
806 | "use the STANDARD target with " | |
807 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
808 | return -EINVAL; |
809 | } | |
1da177e4 | 810 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 811 | } |
1da177e4 LT |
812 | } |
813 | ||
1da177e4 | 814 | /* Clear counters and comefrom */ |
2e4e6a17 | 815 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 816 | e->comefrom = 0; |
1da177e4 LT |
817 | return 0; |
818 | } | |
819 | ||
0559518b | 820 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
1da177e4 | 821 | { |
a2df1648 | 822 | struct xt_tgdtor_param par; |
1da177e4 LT |
823 | struct ip6t_entry_target *t; |
824 | ||
1da177e4 | 825 | /* Cleanup all matches */ |
f54e9367 | 826 | IP6T_MATCH_ITERATE(e, cleanup_match, net, NULL); |
1da177e4 | 827 | t = ip6t_get_target(e); |
a2df1648 | 828 | |
add67461 | 829 | par.net = net; |
a2df1648 JE |
830 | par.target = t->u.kernel.target; |
831 | par.targinfo = t->data; | |
916a917d | 832 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
833 | if (par.target->destroy != NULL) |
834 | par.target->destroy(&par); | |
835 | module_put(par.target->me); | |
1da177e4 LT |
836 | } |
837 | ||
838 | /* Checks and translates the user-supplied table segment (held in | |
839 | newinfo) */ | |
840 | static int | |
a83d8e8d AD |
841 | translate_table(struct net *net, |
842 | const char *name, | |
1da177e4 | 843 | unsigned int valid_hooks, |
2e4e6a17 | 844 | struct xt_table_info *newinfo, |
31836064 | 845 | void *entry0, |
1da177e4 LT |
846 | unsigned int size, |
847 | unsigned int number, | |
848 | const unsigned int *hook_entries, | |
849 | const unsigned int *underflows) | |
850 | { | |
72b2b1dd | 851 | struct ip6t_entry *iter; |
1da177e4 | 852 | unsigned int i; |
72b2b1dd | 853 | int ret = 0; |
1da177e4 LT |
854 | |
855 | newinfo->size = size; | |
856 | newinfo->number = number; | |
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, | |
0559518b | 869 | entry0 + size, hook_entries, underflows, valid_hooks); |
72b2b1dd | 870 | if (ret != 0) |
0559518b JE |
871 | return ret; |
872 | ++i; | |
72b2b1dd | 873 | } |
1da177e4 LT |
874 | |
875 | if (i != number) { | |
876 | duprintf("translate_table: %u not %u entries\n", | |
877 | i, number); | |
878 | return -EINVAL; | |
879 | } | |
880 | ||
881 | /* Check hooks all assigned */ | |
6e23ae2a | 882 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
883 | /* Only hooks which are valid */ |
884 | if (!(valid_hooks & (1 << i))) | |
885 | continue; | |
886 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
887 | duprintf("Invalid hook entry %u %u\n", | |
888 | i, hook_entries[i]); | |
889 | return -EINVAL; | |
890 | } | |
891 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
892 | duprintf("Invalid underflow %u %u\n", | |
893 | i, underflows[i]); | |
894 | return -EINVAL; | |
895 | } | |
896 | } | |
897 | ||
74c9c0c1 DM |
898 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
899 | return -ELOOP; | |
900 | ||
1da177e4 LT |
901 | /* Finally, each sanity check must pass */ |
902 | i = 0; | |
72b2b1dd | 903 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0559518b | 904 | ret = find_check_entry(iter, net, name, size); |
72b2b1dd JE |
905 | if (ret != 0) |
906 | break; | |
0559518b | 907 | ++i; |
72b2b1dd | 908 | } |
1da177e4 | 909 | |
74c9c0c1 | 910 | if (ret != 0) { |
0559518b JE |
911 | xt_entry_foreach(iter, entry0, newinfo->size) { |
912 | if (i-- == 0) | |
72b2b1dd | 913 | break; |
0559518b JE |
914 | cleanup_entry(iter, net); |
915 | } | |
74c9c0c1 DM |
916 | return ret; |
917 | } | |
1da177e4 LT |
918 | |
919 | /* And one copy for every other CPU */ | |
6f912042 | 920 | for_each_possible_cpu(i) { |
31836064 ED |
921 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
922 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
923 | } |
924 | ||
9c547959 | 925 | return ret; |
1da177e4 LT |
926 | } |
927 | ||
1da177e4 | 928 | static void |
2e4e6a17 HW |
929 | get_counters(const struct xt_table_info *t, |
930 | struct xt_counters counters[]) | |
1da177e4 | 931 | { |
72b2b1dd | 932 | struct ip6t_entry *iter; |
1da177e4 LT |
933 | unsigned int cpu; |
934 | unsigned int i; | |
31836064 ED |
935 | unsigned int curcpu; |
936 | ||
937 | /* Instead of clearing (by a previous call to memset()) | |
938 | * the counters and using adds, we set the counters | |
939 | * with data used by 'current' CPU | |
942e4a2b SH |
940 | * |
941 | * Bottom half has to be disabled to prevent deadlock | |
942 | * if new softirq were to run and call ipt_do_table | |
31836064 | 943 | */ |
942e4a2b SH |
944 | local_bh_disable(); |
945 | curcpu = smp_processor_id(); | |
31836064 ED |
946 | |
947 | i = 0; | |
0559518b JE |
948 | xt_entry_foreach(iter, t->entries[curcpu], t->size) { |
949 | SET_COUNTER(counters[i], iter->counters.bcnt, | |
950 | iter->counters.pcnt); | |
951 | ++i; | |
952 | } | |
1da177e4 | 953 | |
6f912042 | 954 | for_each_possible_cpu(cpu) { |
31836064 ED |
955 | if (cpu == curcpu) |
956 | continue; | |
1da177e4 | 957 | i = 0; |
942e4a2b | 958 | xt_info_wrlock(cpu); |
0559518b JE |
959 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
960 | ADD_COUNTER(counters[i], iter->counters.bcnt, | |
961 | iter->counters.pcnt); | |
962 | ++i; | |
963 | } | |
942e4a2b | 964 | xt_info_wrunlock(cpu); |
1da177e4 | 965 | } |
78454473 SH |
966 | local_bh_enable(); |
967 | } | |
968 | ||
d5d1baa1 | 969 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 970 | { |
ed1a6f5e | 971 | unsigned int countersize; |
2e4e6a17 | 972 | struct xt_counters *counters; |
d5d1baa1 | 973 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
974 | |
975 | /* We need atomic snapshot of counters: rest doesn't change | |
976 | (other than comefrom, which userspace doesn't care | |
977 | about). */ | |
2e4e6a17 | 978 | countersize = sizeof(struct xt_counters) * private->number; |
3b84e92b | 979 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
980 | |
981 | if (counters == NULL) | |
942e4a2b | 982 | return ERR_PTR(-ENOMEM); |
78454473 | 983 | |
942e4a2b | 984 | get_counters(private, counters); |
78454473 | 985 | |
49a88d18 | 986 | return counters; |
ed1a6f5e PM |
987 | } |
988 | ||
989 | static int | |
990 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 991 | const struct xt_table *table, |
ed1a6f5e PM |
992 | void __user *userptr) |
993 | { | |
994 | unsigned int off, num; | |
d5d1baa1 | 995 | const struct ip6t_entry *e; |
ed1a6f5e | 996 | struct xt_counters *counters; |
5452e425 | 997 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 998 | int ret = 0; |
5452e425 | 999 | const void *loc_cpu_entry; |
ed1a6f5e PM |
1000 | |
1001 | counters = alloc_counters(table); | |
1002 | if (IS_ERR(counters)) | |
1003 | return PTR_ERR(counters); | |
1004 | ||
9c547959 PM |
1005 | /* choose the copy that is on our node/cpu, ... |
1006 | * This choice is lazy (because current thread is | |
1007 | * allowed to migrate to another cpu) | |
1008 | */ | |
2e4e6a17 | 1009 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 1010 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
1011 | ret = -EFAULT; |
1012 | goto free_counters; | |
1013 | } | |
1014 | ||
1015 | /* FIXME: use iterator macros --RR */ | |
1016 | /* ... then go back and fix counters and names */ | |
1017 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
1018 | unsigned int i; | |
5452e425 JE |
1019 | const struct ip6t_entry_match *m; |
1020 | const struct ip6t_entry_target *t; | |
1da177e4 | 1021 | |
31836064 | 1022 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
1023 | if (copy_to_user(userptr + off |
1024 | + offsetof(struct ip6t_entry, counters), | |
1025 | &counters[num], | |
1026 | sizeof(counters[num])) != 0) { | |
1027 | ret = -EFAULT; | |
1028 | goto free_counters; | |
1029 | } | |
1030 | ||
1031 | for (i = sizeof(struct ip6t_entry); | |
1032 | i < e->target_offset; | |
1033 | i += m->u.match_size) { | |
1034 | m = (void *)e + i; | |
1035 | ||
1036 | if (copy_to_user(userptr + off + i | |
1037 | + offsetof(struct ip6t_entry_match, | |
1038 | u.user.name), | |
1039 | m->u.kernel.match->name, | |
1040 | strlen(m->u.kernel.match->name)+1) | |
1041 | != 0) { | |
1042 | ret = -EFAULT; | |
1043 | goto free_counters; | |
1044 | } | |
1045 | } | |
1046 | ||
d5d1baa1 | 1047 | t = ip6t_get_target_c(e); |
1da177e4 LT |
1048 | if (copy_to_user(userptr + off + e->target_offset |
1049 | + offsetof(struct ip6t_entry_target, | |
1050 | u.user.name), | |
1051 | t->u.kernel.target->name, | |
1052 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1053 | ret = -EFAULT; | |
1054 | goto free_counters; | |
1055 | } | |
1056 | } | |
1057 | ||
1058 | free_counters: | |
1059 | vfree(counters); | |
1060 | return ret; | |
1061 | } | |
1062 | ||
3bc3fe5e | 1063 | #ifdef CONFIG_COMPAT |
739674fb | 1064 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
1065 | { |
1066 | int v = *(compat_int_t *)src; | |
1067 | ||
1068 | if (v > 0) | |
1069 | v += xt_compat_calc_jump(AF_INET6, v); | |
1070 | memcpy(dst, &v, sizeof(v)); | |
1071 | } | |
1072 | ||
739674fb | 1073 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
1074 | { |
1075 | compat_int_t cv = *(int *)src; | |
1076 | ||
1077 | if (cv > 0) | |
1078 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1079 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1080 | } | |
1081 | ||
1082 | static inline int | |
d5d1baa1 | 1083 | compat_calc_match(const struct ip6t_entry_match *m, int *size) |
3bc3fe5e PM |
1084 | { |
1085 | *size += xt_compat_match_offset(m->u.kernel.match); | |
1086 | return 0; | |
1087 | } | |
1088 | ||
d5d1baa1 | 1089 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 1090 | const struct xt_table_info *info, |
d5d1baa1 | 1091 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 1092 | { |
d5d1baa1 | 1093 | const struct ip6t_entry_target *t; |
3bc3fe5e PM |
1094 | unsigned int entry_offset; |
1095 | int off, i, ret; | |
1096 | ||
1097 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1098 | entry_offset = (void *)e - base; | |
1099 | IP6T_MATCH_ITERATE(e, compat_calc_match, &off); | |
d5d1baa1 | 1100 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
1101 | off += xt_compat_target_offset(t->u.kernel.target); |
1102 | newinfo->size -= off; | |
1103 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1104 | if (ret) | |
1105 | return ret; | |
1106 | ||
1107 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1108 | if (info->hook_entry[i] && | |
1109 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1110 | newinfo->hook_entry[i] -= off; | |
1111 | if (info->underflow[i] && | |
1112 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1113 | newinfo->underflow[i] -= off; | |
1114 | } | |
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | static int compat_table_info(const struct xt_table_info *info, | |
1119 | struct xt_table_info *newinfo) | |
1120 | { | |
72b2b1dd | 1121 | struct ip6t_entry *iter; |
3bc3fe5e | 1122 | void *loc_cpu_entry; |
0559518b | 1123 | int ret; |
3bc3fe5e PM |
1124 | |
1125 | if (!newinfo || !info) | |
1126 | return -EINVAL; | |
1127 | ||
1128 | /* we dont care about newinfo->entries[] */ | |
1129 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1130 | newinfo->initial_entries = 0; | |
1131 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
72b2b1dd JE |
1132 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1133 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1134 | if (ret != 0) | |
0559518b | 1135 | return ret; |
72b2b1dd | 1136 | } |
0559518b | 1137 | return 0; |
3bc3fe5e PM |
1138 | } |
1139 | #endif | |
1140 | ||
d5d1baa1 JE |
1141 | static int get_info(struct net *net, void __user *user, |
1142 | const int *len, int compat) | |
433665c9 PM |
1143 | { |
1144 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1145 | struct xt_table *t; | |
1146 | int ret; | |
1147 | ||
1148 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1149 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1150 | sizeof(struct ip6t_getinfo)); |
1151 | return -EINVAL; | |
1152 | } | |
1153 | ||
1154 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1155 | return -EFAULT; | |
1156 | ||
1157 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; | |
3bc3fe5e PM |
1158 | #ifdef CONFIG_COMPAT |
1159 | if (compat) | |
1160 | xt_compat_lock(AF_INET6); | |
1161 | #endif | |
336b517f | 1162 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 PM |
1163 | "ip6table_%s", name); |
1164 | if (t && !IS_ERR(t)) { | |
1165 | struct ip6t_getinfo info; | |
5452e425 | 1166 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1167 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1168 | struct xt_table_info tmp; |
1169 | ||
3bc3fe5e | 1170 | if (compat) { |
3bc3fe5e PM |
1171 | ret = compat_table_info(private, &tmp); |
1172 | xt_compat_flush_offsets(AF_INET6); | |
1173 | private = &tmp; | |
1174 | } | |
1175 | #endif | |
433665c9 PM |
1176 | info.valid_hooks = t->valid_hooks; |
1177 | memcpy(info.hook_entry, private->hook_entry, | |
1178 | sizeof(info.hook_entry)); | |
1179 | memcpy(info.underflow, private->underflow, | |
1180 | sizeof(info.underflow)); | |
1181 | info.num_entries = private->number; | |
1182 | info.size = private->size; | |
b5dd674b | 1183 | strcpy(info.name, name); |
433665c9 PM |
1184 | |
1185 | if (copy_to_user(user, &info, *len) != 0) | |
1186 | ret = -EFAULT; | |
1187 | else | |
1188 | ret = 0; | |
1189 | ||
1190 | xt_table_unlock(t); | |
1191 | module_put(t->me); | |
1192 | } else | |
1193 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1194 | #ifdef CONFIG_COMPAT |
1195 | if (compat) | |
1196 | xt_compat_unlock(AF_INET6); | |
1197 | #endif | |
433665c9 PM |
1198 | return ret; |
1199 | } | |
1200 | ||
1da177e4 | 1201 | static int |
d5d1baa1 JE |
1202 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
1203 | const int *len) | |
1da177e4 LT |
1204 | { |
1205 | int ret; | |
d924357c | 1206 | struct ip6t_get_entries get; |
2e4e6a17 | 1207 | struct xt_table *t; |
1da177e4 | 1208 | |
d924357c | 1209 | if (*len < sizeof(get)) { |
c9d8fe13 | 1210 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1211 | return -EINVAL; |
1212 | } | |
1213 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1214 | return -EFAULT; | |
1215 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1216 | duprintf("get_entries: %u != %zu\n", |
1217 | *len, sizeof(get) + get.size); | |
d924357c PM |
1218 | return -EINVAL; |
1219 | } | |
1220 | ||
336b517f | 1221 | t = xt_find_table_lock(net, AF_INET6, get.name); |
6b7d31fc | 1222 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
1223 | struct xt_table_info *private = t->private; |
1224 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1225 | if (get.size == private->size) |
2e4e6a17 | 1226 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1227 | t, uptr->entrytable); |
1228 | else { | |
1229 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1230 | private->size, get.size); |
544473c1 | 1231 | ret = -EAGAIN; |
1da177e4 | 1232 | } |
6b7d31fc | 1233 | module_put(t->me); |
2e4e6a17 | 1234 | xt_table_unlock(t); |
1da177e4 | 1235 | } else |
6b7d31fc | 1236 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1237 | |
1238 | return ret; | |
1239 | } | |
1240 | ||
1241 | static int | |
336b517f | 1242 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1243 | struct xt_table_info *newinfo, unsigned int num_counters, |
1244 | void __user *counters_ptr) | |
1da177e4 LT |
1245 | { |
1246 | int ret; | |
2e4e6a17 | 1247 | struct xt_table *t; |
3bc3fe5e | 1248 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1249 | struct xt_counters *counters; |
5452e425 | 1250 | const void *loc_cpu_old_entry; |
72b2b1dd | 1251 | struct ip6t_entry *iter; |
1da177e4 | 1252 | |
3bc3fe5e PM |
1253 | ret = 0; |
1254 | counters = vmalloc_node(num_counters * sizeof(struct xt_counters), | |
3b84e92b | 1255 | numa_node_id()); |
1da177e4 LT |
1256 | if (!counters) { |
1257 | ret = -ENOMEM; | |
3bc3fe5e | 1258 | goto out; |
1da177e4 | 1259 | } |
1da177e4 | 1260 | |
336b517f | 1261 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1262 | "ip6table_%s", name); |
6b7d31fc HW |
1263 | if (!t || IS_ERR(t)) { |
1264 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1265 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1266 | } |
1da177e4 LT |
1267 | |
1268 | /* You lied! */ | |
3bc3fe5e | 1269 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1270 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1271 | valid_hooks, t->valid_hooks); |
1da177e4 | 1272 | ret = -EINVAL; |
6b7d31fc | 1273 | goto put_module; |
1da177e4 LT |
1274 | } |
1275 | ||
3bc3fe5e | 1276 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1277 | if (!oldinfo) |
1278 | goto put_module; | |
1279 | ||
1280 | /* Update module usage count based on number of rules */ | |
1281 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1282 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1283 | if ((oldinfo->number > oldinfo->initial_entries) || |
1284 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1285 | module_put(t->me); |
1286 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1287 | (newinfo->number <= oldinfo->initial_entries)) | |
1288 | module_put(t->me); | |
1289 | ||
942e4a2b | 1290 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1291 | get_counters(oldinfo, counters); |
942e4a2b | 1292 | |
1da177e4 | 1293 | /* Decrease module usage counts and free resource */ |
31836064 | 1294 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
72b2b1dd | 1295 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1296 | cleanup_entry(iter, net); |
72b2b1dd | 1297 | |
2e4e6a17 | 1298 | xt_free_table_info(oldinfo); |
3bc3fe5e PM |
1299 | if (copy_to_user(counters_ptr, counters, |
1300 | sizeof(struct xt_counters) * num_counters) != 0) | |
1da177e4 LT |
1301 | ret = -EFAULT; |
1302 | vfree(counters); | |
2e4e6a17 | 1303 | xt_table_unlock(t); |
1da177e4 LT |
1304 | return ret; |
1305 | ||
1306 | put_module: | |
1307 | module_put(t->me); | |
2e4e6a17 | 1308 | xt_table_unlock(t); |
1da177e4 | 1309 | free_newinfo_counters_untrans: |
1da177e4 | 1310 | vfree(counters); |
3bc3fe5e PM |
1311 | out: |
1312 | return ret; | |
1313 | } | |
1314 | ||
1315 | static int | |
d5d1baa1 | 1316 | do_replace(struct net *net, const void __user *user, unsigned int len) |
3bc3fe5e PM |
1317 | { |
1318 | int ret; | |
1319 | struct ip6t_replace tmp; | |
1320 | struct xt_table_info *newinfo; | |
1321 | void *loc_cpu_entry; | |
72b2b1dd | 1322 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1323 | |
1324 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1325 | return -EFAULT; | |
1326 | ||
1327 | /* overflow check */ | |
1328 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1329 | return -ENOMEM; | |
1330 | ||
1331 | newinfo = xt_alloc_table_info(tmp.size); | |
1332 | if (!newinfo) | |
1333 | return -ENOMEM; | |
1334 | ||
1335 | /* choose the copy that is on our node/cpu */ | |
1336 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1337 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1338 | tmp.size) != 0) { | |
1339 | ret = -EFAULT; | |
1340 | goto free_newinfo; | |
1341 | } | |
1342 | ||
a83d8e8d | 1343 | ret = translate_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1344 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, |
1345 | tmp.hook_entry, tmp.underflow); | |
1346 | if (ret != 0) | |
1347 | goto free_newinfo; | |
1348 | ||
1349 | duprintf("ip_tables: Translated table\n"); | |
1350 | ||
336b517f | 1351 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1352 | tmp.num_counters, tmp.counters); |
1353 | if (ret) | |
1354 | goto free_newinfo_untrans; | |
1355 | return 0; | |
1356 | ||
1357 | free_newinfo_untrans: | |
72b2b1dd | 1358 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1359 | cleanup_entry(iter, net); |
1da177e4 | 1360 | free_newinfo: |
2e4e6a17 | 1361 | xt_free_table_info(newinfo); |
1da177e4 LT |
1362 | return ret; |
1363 | } | |
1364 | ||
1da177e4 | 1365 | static int |
d5d1baa1 | 1366 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
336b517f | 1367 | int compat) |
1da177e4 | 1368 | { |
942e4a2b | 1369 | unsigned int i, curcpu; |
3bc3fe5e PM |
1370 | struct xt_counters_info tmp; |
1371 | struct xt_counters *paddc; | |
1372 | unsigned int num_counters; | |
1373 | char *name; | |
1374 | int size; | |
1375 | void *ptmp; | |
2e4e6a17 | 1376 | struct xt_table *t; |
5452e425 | 1377 | const struct xt_table_info *private; |
6b7d31fc | 1378 | int ret = 0; |
5452e425 | 1379 | const void *loc_cpu_entry; |
72b2b1dd | 1380 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1381 | #ifdef CONFIG_COMPAT |
1382 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1383 | |
3bc3fe5e PM |
1384 | if (compat) { |
1385 | ptmp = &compat_tmp; | |
1386 | size = sizeof(struct compat_xt_counters_info); | |
1387 | } else | |
1388 | #endif | |
1389 | { | |
1390 | ptmp = &tmp; | |
1391 | size = sizeof(struct xt_counters_info); | |
1392 | } | |
1393 | ||
1394 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1395 | return -EFAULT; |
1396 | ||
3bc3fe5e PM |
1397 | #ifdef CONFIG_COMPAT |
1398 | if (compat) { | |
1399 | num_counters = compat_tmp.num_counters; | |
1400 | name = compat_tmp.name; | |
1401 | } else | |
1402 | #endif | |
1403 | { | |
1404 | num_counters = tmp.num_counters; | |
1405 | name = tmp.name; | |
1406 | } | |
1407 | ||
1408 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1409 | return -EINVAL; |
1410 | ||
3bc3fe5e | 1411 | paddc = vmalloc_node(len - size, numa_node_id()); |
1da177e4 LT |
1412 | if (!paddc) |
1413 | return -ENOMEM; | |
1414 | ||
3bc3fe5e | 1415 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1416 | ret = -EFAULT; |
1417 | goto free; | |
1418 | } | |
1419 | ||
336b517f | 1420 | t = xt_find_table_lock(net, AF_INET6, name); |
6b7d31fc HW |
1421 | if (!t || IS_ERR(t)) { |
1422 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1423 | goto free; |
6b7d31fc | 1424 | } |
1da177e4 | 1425 | |
942e4a2b SH |
1426 | |
1427 | local_bh_disable(); | |
2e4e6a17 | 1428 | private = t->private; |
3bc3fe5e | 1429 | if (private->number != num_counters) { |
1da177e4 LT |
1430 | ret = -EINVAL; |
1431 | goto unlock_up_free; | |
1432 | } | |
1433 | ||
1434 | i = 0; | |
31836064 | 1435 | /* Choose the copy that is on our node */ |
942e4a2b SH |
1436 | curcpu = smp_processor_id(); |
1437 | xt_info_wrlock(curcpu); | |
1438 | loc_cpu_entry = private->entries[curcpu]; | |
0559518b JE |
1439 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1440 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1441 | ++i; | |
1442 | } | |
942e4a2b SH |
1443 | xt_info_wrunlock(curcpu); |
1444 | ||
1da177e4 | 1445 | unlock_up_free: |
942e4a2b | 1446 | local_bh_enable(); |
2e4e6a17 | 1447 | xt_table_unlock(t); |
6b7d31fc | 1448 | module_put(t->me); |
1da177e4 LT |
1449 | free: |
1450 | vfree(paddc); | |
1451 | ||
1452 | return ret; | |
1453 | } | |
1454 | ||
3bc3fe5e PM |
1455 | #ifdef CONFIG_COMPAT |
1456 | struct compat_ip6t_replace { | |
1457 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1458 | u32 valid_hooks; | |
1459 | u32 num_entries; | |
1460 | u32 size; | |
1461 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1462 | u32 underflow[NF_INET_NUMHOOKS]; | |
1463 | u32 num_counters; | |
1464 | compat_uptr_t counters; /* struct ip6t_counters * */ | |
1465 | struct compat_ip6t_entry entries[0]; | |
1466 | }; | |
1467 | ||
1468 | static int | |
1469 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1470 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1471 | unsigned int i) |
3bc3fe5e PM |
1472 | { |
1473 | struct ip6t_entry_target *t; | |
1474 | struct compat_ip6t_entry __user *ce; | |
1475 | u_int16_t target_offset, next_offset; | |
1476 | compat_uint_t origsize; | |
1477 | int ret; | |
1478 | ||
3bc3fe5e PM |
1479 | origsize = *size; |
1480 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
0559518b JE |
1481 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1482 | copy_to_user(&ce->counters, &counters[i], | |
1483 | sizeof(counters[i])) != 0) | |
1484 | return -EFAULT; | |
3bc3fe5e PM |
1485 | |
1486 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1487 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1488 | ||
1489 | ret = IP6T_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size); | |
1490 | target_offset = e->target_offset - (origsize - *size); | |
1491 | if (ret) | |
0559518b | 1492 | return ret; |
3bc3fe5e PM |
1493 | t = ip6t_get_target(e); |
1494 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1495 | if (ret) | |
0559518b | 1496 | return ret; |
3bc3fe5e | 1497 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1498 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1499 | put_user(next_offset, &ce->next_offset) != 0) | |
1500 | return -EFAULT; | |
3bc3fe5e | 1501 | return 0; |
3bc3fe5e PM |
1502 | } |
1503 | ||
022748a9 | 1504 | static int |
3bc3fe5e PM |
1505 | compat_find_calc_match(struct ip6t_entry_match *m, |
1506 | const char *name, | |
1507 | const struct ip6t_ip6 *ipv6, | |
1508 | unsigned int hookmask, | |
b0a6363c | 1509 | int *size, unsigned int *i) |
3bc3fe5e PM |
1510 | { |
1511 | struct xt_match *match; | |
1512 | ||
1513 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, | |
1514 | m->u.user.revision), | |
1515 | "ip6t_%s", m->u.user.name); | |
1516 | if (IS_ERR(match) || !match) { | |
1517 | duprintf("compat_check_calc_match: `%s' not found\n", | |
1518 | m->u.user.name); | |
1519 | return match ? PTR_ERR(match) : -ENOENT; | |
1520 | } | |
1521 | m->u.kernel.match = match; | |
1522 | *size += xt_compat_match_offset(match); | |
1523 | ||
1524 | (*i)++; | |
1525 | return 0; | |
1526 | } | |
1527 | ||
022748a9 | 1528 | static int |
3bc3fe5e PM |
1529 | compat_release_match(struct ip6t_entry_match *m, unsigned int *i) |
1530 | { | |
1531 | if (i && (*i)-- == 0) | |
1532 | return 1; | |
1533 | ||
1534 | module_put(m->u.kernel.match->me); | |
1535 | return 0; | |
1536 | } | |
1537 | ||
0559518b | 1538 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e PM |
1539 | { |
1540 | struct ip6t_entry_target *t; | |
1541 | ||
3bc3fe5e PM |
1542 | /* Cleanup all matches */ |
1543 | COMPAT_IP6T_MATCH_ITERATE(e, compat_release_match, NULL); | |
1544 | t = compat_ip6t_get_target(e); | |
1545 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1546 | } |
1547 | ||
022748a9 | 1548 | static int |
3bc3fe5e PM |
1549 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1550 | struct xt_table_info *newinfo, | |
1551 | unsigned int *size, | |
d5d1baa1 JE |
1552 | const unsigned char *base, |
1553 | const unsigned char *limit, | |
1554 | const unsigned int *hook_entries, | |
1555 | const unsigned int *underflows, | |
3bc3fe5e PM |
1556 | const char *name) |
1557 | { | |
1558 | struct ip6t_entry_target *t; | |
1559 | struct xt_target *target; | |
1560 | unsigned int entry_offset; | |
b0a6363c PM |
1561 | unsigned int j; |
1562 | int ret, off, h; | |
3bc3fe5e PM |
1563 | |
1564 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1565 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
1566 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
3bc3fe5e PM |
1567 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1568 | return -EINVAL; | |
1569 | } | |
1570 | ||
1571 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1572 | sizeof(struct compat_xt_entry_target)) { | |
1573 | duprintf("checking: element %p size %u\n", | |
1574 | e, e->next_offset); | |
1575 | return -EINVAL; | |
1576 | } | |
1577 | ||
1578 | /* For purposes of check_entry casting the compat entry is fine */ | |
1579 | ret = check_entry((struct ip6t_entry *)e, name); | |
1580 | if (ret) | |
1581 | return ret; | |
1582 | ||
1583 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1584 | entry_offset = (void *)e - (void *)base; | |
1585 | j = 0; | |
1586 | ret = COMPAT_IP6T_MATCH_ITERATE(e, compat_find_calc_match, name, | |
1587 | &e->ipv6, e->comefrom, &off, &j); | |
1588 | if (ret != 0) | |
1589 | goto release_matches; | |
1590 | ||
1591 | t = compat_ip6t_get_target(e); | |
1592 | target = try_then_request_module(xt_find_target(AF_INET6, | |
1593 | t->u.user.name, | |
1594 | t->u.user.revision), | |
1595 | "ip6t_%s", t->u.user.name); | |
1596 | if (IS_ERR(target) || !target) { | |
1597 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", | |
1598 | t->u.user.name); | |
1599 | ret = target ? PTR_ERR(target) : -ENOENT; | |
1600 | goto release_matches; | |
1601 | } | |
1602 | t->u.kernel.target = target; | |
1603 | ||
1604 | off += xt_compat_target_offset(target); | |
1605 | *size += off; | |
1606 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1607 | if (ret) | |
1608 | goto out; | |
1609 | ||
1610 | /* Check hooks & underflows */ | |
1611 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1612 | if ((unsigned char *)e - base == hook_entries[h]) | |
1613 | newinfo->hook_entry[h] = hook_entries[h]; | |
1614 | if ((unsigned char *)e - base == underflows[h]) | |
1615 | newinfo->underflow[h] = underflows[h]; | |
1616 | } | |
1617 | ||
1618 | /* Clear counters and comefrom */ | |
1619 | memset(&e->counters, 0, sizeof(e->counters)); | |
1620 | e->comefrom = 0; | |
3bc3fe5e PM |
1621 | return 0; |
1622 | ||
1623 | out: | |
1624 | module_put(t->u.kernel.target->me); | |
1625 | release_matches: | |
1626 | IP6T_MATCH_ITERATE(e, compat_release_match, &j); | |
1627 | return ret; | |
1628 | } | |
1629 | ||
1630 | static int | |
1631 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1632 | unsigned int *size, const char *name, | |
1633 | struct xt_table_info *newinfo, unsigned char *base) | |
1634 | { | |
1635 | struct ip6t_entry_target *t; | |
1636 | struct xt_target *target; | |
1637 | struct ip6t_entry *de; | |
1638 | unsigned int origsize; | |
1639 | int ret, h; | |
1640 | ||
1641 | ret = 0; | |
1642 | origsize = *size; | |
1643 | de = (struct ip6t_entry *)*dstptr; | |
1644 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1645 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1646 | ||
1647 | *dstptr += sizeof(struct ip6t_entry); | |
1648 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1649 | ||
1650 | ret = COMPAT_IP6T_MATCH_ITERATE(e, xt_compat_match_from_user, | |
1651 | dstptr, size); | |
1652 | if (ret) | |
1653 | return ret; | |
1654 | de->target_offset = e->target_offset - (origsize - *size); | |
1655 | t = compat_ip6t_get_target(e); | |
1656 | target = t->u.kernel.target; | |
1657 | xt_compat_target_from_user(t, dstptr, size); | |
1658 | ||
1659 | de->next_offset = e->next_offset - (origsize - *size); | |
1660 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1661 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1662 | newinfo->hook_entry[h] -= origsize - *size; | |
1663 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1664 | newinfo->underflow[h] -= origsize - *size; | |
1665 | } | |
1666 | return ret; | |
1667 | } | |
1668 | ||
f54e9367 | 1669 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
0559518b | 1670 | const char *name) |
3bc3fe5e | 1671 | { |
b0a6363c PM |
1672 | unsigned int j; |
1673 | int ret; | |
9b4fce7a | 1674 | struct xt_mtchk_param mtpar; |
3bc3fe5e PM |
1675 | |
1676 | j = 0; | |
f54e9367 | 1677 | mtpar.net = net; |
9b4fce7a JE |
1678 | mtpar.table = name; |
1679 | mtpar.entryinfo = &e->ipv6; | |
1680 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1681 | mtpar.family = NFPROTO_IPV6; |
9b4fce7a | 1682 | ret = IP6T_MATCH_ITERATE(e, check_match, &mtpar, &j); |
3bc3fe5e PM |
1683 | if (ret) |
1684 | goto cleanup_matches; | |
1685 | ||
add67461 | 1686 | ret = check_target(e, net, name); |
3bc3fe5e PM |
1687 | if (ret) |
1688 | goto cleanup_matches; | |
3bc3fe5e PM |
1689 | return 0; |
1690 | ||
1691 | cleanup_matches: | |
f54e9367 | 1692 | IP6T_MATCH_ITERATE(e, cleanup_match, net, &j); |
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, | |
1732 | entry0, entry0 + total_size, hook_entries, underflows, | |
0559518b | 1733 | name); |
72b2b1dd | 1734 | if (ret != 0) |
0559518b JE |
1735 | goto out_unlock; |
1736 | ++j; | |
72b2b1dd | 1737 | } |
3bc3fe5e PM |
1738 | |
1739 | ret = -EINVAL; | |
1740 | if (j != number) { | |
1741 | duprintf("translate_compat_table: %u not %u entries\n", | |
1742 | j, number); | |
1743 | goto out_unlock; | |
1744 | } | |
1745 | ||
1746 | /* Check hooks all assigned */ | |
1747 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1748 | /* Only hooks which are valid */ | |
1749 | if (!(valid_hooks & (1 << i))) | |
1750 | continue; | |
1751 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1752 | duprintf("Invalid hook entry %u %u\n", | |
1753 | i, hook_entries[i]); | |
1754 | goto out_unlock; | |
1755 | } | |
1756 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1757 | duprintf("Invalid underflow %u %u\n", | |
1758 | i, underflows[i]); | |
1759 | goto out_unlock; | |
1760 | } | |
1761 | } | |
1762 | ||
1763 | ret = -ENOMEM; | |
1764 | newinfo = xt_alloc_table_info(size); | |
1765 | if (!newinfo) | |
1766 | goto out_unlock; | |
1767 | ||
1768 | newinfo->number = number; | |
1769 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1770 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1771 | newinfo->underflow[i] = info->underflow[i]; | |
1772 | } | |
1773 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1774 | pos = entry1; | |
1775 | size = total_size; | |
72b2b1dd JE |
1776 | xt_entry_foreach(iter0, entry0, total_size) { |
1777 | ret = compat_copy_entry_from_user(iter0, &pos, | |
1778 | &size, name, newinfo, entry1); | |
1779 | if (ret != 0) | |
1780 | break; | |
1781 | } | |
3bc3fe5e PM |
1782 | xt_compat_flush_offsets(AF_INET6); |
1783 | xt_compat_unlock(AF_INET6); | |
1784 | if (ret) | |
1785 | goto free_newinfo; | |
1786 | ||
1787 | ret = -ELOOP; | |
1788 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1789 | goto free_newinfo; | |
1790 | ||
1791 | i = 0; | |
72b2b1dd | 1792 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1793 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1794 | if (ret != 0) |
1795 | break; | |
0559518b | 1796 | ++i; |
72b2b1dd | 1797 | } |
3bc3fe5e | 1798 | if (ret) { |
72b2b1dd JE |
1799 | /* |
1800 | * The first i matches need cleanup_entry (calls ->destroy) | |
1801 | * because they had called ->check already. The other j-i | |
1802 | * entries need only release. | |
1803 | */ | |
1804 | int skip = i; | |
3bc3fe5e | 1805 | j -= i; |
72b2b1dd JE |
1806 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1807 | if (skip-- > 0) | |
1808 | continue; | |
0559518b | 1809 | if (j-- == 0) |
72b2b1dd | 1810 | break; |
0559518b | 1811 | compat_release_entry(iter0); |
72b2b1dd | 1812 | } |
0559518b JE |
1813 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1814 | if (i-- == 0) | |
72b2b1dd | 1815 | break; |
0559518b JE |
1816 | cleanup_entry(iter1, net); |
1817 | } | |
3bc3fe5e PM |
1818 | xt_free_table_info(newinfo); |
1819 | return ret; | |
1820 | } | |
1821 | ||
1822 | /* And one copy for every other CPU */ | |
1823 | for_each_possible_cpu(i) | |
1824 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1825 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1826 | ||
1827 | *pinfo = newinfo; | |
1828 | *pentry0 = entry1; | |
1829 | xt_free_table_info(info); | |
1830 | return 0; | |
1831 | ||
1832 | free_newinfo: | |
1833 | xt_free_table_info(newinfo); | |
1834 | out: | |
0559518b JE |
1835 | xt_entry_foreach(iter0, entry0, total_size) { |
1836 | if (j-- == 0) | |
72b2b1dd | 1837 | break; |
0559518b JE |
1838 | compat_release_entry(iter0); |
1839 | } | |
3bc3fe5e PM |
1840 | return ret; |
1841 | out_unlock: | |
1842 | xt_compat_flush_offsets(AF_INET6); | |
1843 | xt_compat_unlock(AF_INET6); | |
1844 | goto out; | |
1845 | } | |
1846 | ||
1847 | static int | |
336b517f | 1848 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1849 | { |
1850 | int ret; | |
1851 | struct compat_ip6t_replace tmp; | |
1852 | struct xt_table_info *newinfo; | |
1853 | void *loc_cpu_entry; | |
72b2b1dd | 1854 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1855 | |
1856 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1857 | return -EFAULT; | |
1858 | ||
1859 | /* overflow check */ | |
1860 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1861 | return -ENOMEM; | |
1862 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1863 | return -ENOMEM; | |
1864 | ||
1865 | newinfo = xt_alloc_table_info(tmp.size); | |
1866 | if (!newinfo) | |
1867 | return -ENOMEM; | |
1868 | ||
9c547959 | 1869 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1870 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1871 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1872 | tmp.size) != 0) { | |
1873 | ret = -EFAULT; | |
1874 | goto free_newinfo; | |
1875 | } | |
1876 | ||
f54e9367 | 1877 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1878 | &newinfo, &loc_cpu_entry, tmp.size, |
1879 | tmp.num_entries, tmp.hook_entry, | |
1880 | tmp.underflow); | |
1881 | if (ret != 0) | |
1882 | goto free_newinfo; | |
1883 | ||
1884 | duprintf("compat_do_replace: Translated table\n"); | |
1885 | ||
336b517f | 1886 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1887 | tmp.num_counters, compat_ptr(tmp.counters)); |
1888 | if (ret) | |
1889 | goto free_newinfo_untrans; | |
1890 | return 0; | |
1891 | ||
1892 | free_newinfo_untrans: | |
72b2b1dd | 1893 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1894 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1895 | free_newinfo: |
1896 | xt_free_table_info(newinfo); | |
1897 | return ret; | |
1898 | } | |
1899 | ||
1900 | static int | |
1901 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1902 | unsigned int len) | |
1903 | { | |
1904 | int ret; | |
1905 | ||
1906 | if (!capable(CAP_NET_ADMIN)) | |
1907 | return -EPERM; | |
1908 | ||
1909 | switch (cmd) { | |
1910 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1911 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1912 | break; |
1913 | ||
1914 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1915 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1916 | break; |
1917 | ||
1918 | default: | |
1919 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1920 | ret = -EINVAL; | |
1921 | } | |
1922 | ||
1923 | return ret; | |
1924 | } | |
1925 | ||
1926 | struct compat_ip6t_get_entries { | |
1927 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1928 | compat_uint_t size; | |
1929 | struct compat_ip6t_entry entrytable[0]; | |
1930 | }; | |
1931 | ||
1932 | static int | |
1933 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1934 | void __user *userptr) | |
1935 | { | |
1936 | struct xt_counters *counters; | |
5452e425 | 1937 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1938 | void __user *pos; |
1939 | unsigned int size; | |
1940 | int ret = 0; | |
5452e425 | 1941 | const void *loc_cpu_entry; |
3bc3fe5e | 1942 | unsigned int i = 0; |
72b2b1dd | 1943 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1944 | |
1945 | counters = alloc_counters(table); | |
1946 | if (IS_ERR(counters)) | |
1947 | return PTR_ERR(counters); | |
1948 | ||
1949 | /* choose the copy that is on our node/cpu, ... | |
1950 | * This choice is lazy (because current thread is | |
1951 | * allowed to migrate to another cpu) | |
1952 | */ | |
1953 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1954 | pos = userptr; | |
1955 | size = total_size; | |
72b2b1dd JE |
1956 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1957 | ret = compat_copy_entry_to_user(iter, &pos, | |
0559518b | 1958 | &size, counters, i++); |
72b2b1dd JE |
1959 | if (ret != 0) |
1960 | break; | |
1961 | } | |
3bc3fe5e PM |
1962 | |
1963 | vfree(counters); | |
1964 | return ret; | |
1965 | } | |
1966 | ||
1967 | static int | |
336b517f AD |
1968 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1969 | int *len) | |
3bc3fe5e PM |
1970 | { |
1971 | int ret; | |
1972 | struct compat_ip6t_get_entries get; | |
1973 | struct xt_table *t; | |
1974 | ||
1975 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1976 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1977 | return -EINVAL; |
1978 | } | |
1979 | ||
1980 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1981 | return -EFAULT; | |
1982 | ||
1983 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1984 | duprintf("compat_get_entries: %u != %zu\n", |
1985 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1986 | return -EINVAL; |
1987 | } | |
1988 | ||
1989 | xt_compat_lock(AF_INET6); | |
336b517f | 1990 | t = xt_find_table_lock(net, AF_INET6, get.name); |
3bc3fe5e | 1991 | if (t && !IS_ERR(t)) { |
5452e425 | 1992 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1993 | struct xt_table_info info; |
9c547959 | 1994 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1995 | ret = compat_table_info(private, &info); |
1996 | if (!ret && get.size == info.size) { | |
1997 | ret = compat_copy_entries_to_user(private->size, | |
1998 | t, uptr->entrytable); | |
1999 | } else if (!ret) { | |
2000 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 2001 | private->size, get.size); |
544473c1 | 2002 | ret = -EAGAIN; |
3bc3fe5e PM |
2003 | } |
2004 | xt_compat_flush_offsets(AF_INET6); | |
2005 | module_put(t->me); | |
2006 | xt_table_unlock(t); | |
2007 | } else | |
2008 | ret = t ? PTR_ERR(t) : -ENOENT; | |
2009 | ||
2010 | xt_compat_unlock(AF_INET6); | |
2011 | return ret; | |
2012 | } | |
2013 | ||
2014 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
2015 | ||
2016 | static int | |
2017 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2018 | { | |
2019 | int ret; | |
2020 | ||
2021 | if (!capable(CAP_NET_ADMIN)) | |
2022 | return -EPERM; | |
2023 | ||
2024 | switch (cmd) { | |
2025 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 2026 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
2027 | break; |
2028 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 2029 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
2030 | break; |
2031 | default: | |
2032 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
2033 | } | |
2034 | return ret; | |
2035 | } | |
2036 | #endif | |
2037 | ||
1da177e4 LT |
2038 | static int |
2039 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2040 | { | |
2041 | int ret; | |
2042 | ||
2043 | if (!capable(CAP_NET_ADMIN)) | |
2044 | return -EPERM; | |
2045 | ||
2046 | switch (cmd) { | |
2047 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2048 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2049 | break; |
2050 | ||
2051 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2052 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2053 | break; |
2054 | ||
2055 | default: | |
2056 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2057 | ret = -EINVAL; | |
2058 | } | |
2059 | ||
2060 | return ret; | |
2061 | } | |
2062 | ||
2063 | static int | |
2064 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2065 | { | |
2066 | int ret; | |
2067 | ||
2068 | if (!capable(CAP_NET_ADMIN)) | |
2069 | return -EPERM; | |
2070 | ||
2071 | switch (cmd) { | |
433665c9 | 2072 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2073 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2074 | break; |
1da177e4 | 2075 | |
d924357c | 2076 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2077 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2078 | break; |
1da177e4 | 2079 | |
6b7d31fc HW |
2080 | case IP6T_SO_GET_REVISION_MATCH: |
2081 | case IP6T_SO_GET_REVISION_TARGET: { | |
2082 | struct ip6t_get_revision rev; | |
2e4e6a17 | 2083 | int target; |
6b7d31fc HW |
2084 | |
2085 | if (*len != sizeof(rev)) { | |
2086 | ret = -EINVAL; | |
2087 | break; | |
2088 | } | |
2089 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2090 | ret = -EFAULT; | |
2091 | break; | |
2092 | } | |
2093 | ||
2094 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2095 | target = 1; |
6b7d31fc | 2096 | else |
2e4e6a17 | 2097 | target = 0; |
6b7d31fc | 2098 | |
2e4e6a17 HW |
2099 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2100 | rev.revision, | |
2101 | target, &ret), | |
6b7d31fc HW |
2102 | "ip6t_%s", rev.name); |
2103 | break; | |
2104 | } | |
2105 | ||
1da177e4 LT |
2106 | default: |
2107 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2108 | ret = -EINVAL; | |
2109 | } | |
2110 | ||
2111 | return ret; | |
2112 | } | |
2113 | ||
35aad0ff JE |
2114 | struct xt_table *ip6t_register_table(struct net *net, |
2115 | const struct xt_table *table, | |
336b517f | 2116 | const struct ip6t_replace *repl) |
1da177e4 LT |
2117 | { |
2118 | int ret; | |
2e4e6a17 | 2119 | struct xt_table_info *newinfo; |
259d4e41 | 2120 | struct xt_table_info bootstrap |
1da177e4 | 2121 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2122 | void *loc_cpu_entry; |
a98da11d | 2123 | struct xt_table *new_table; |
1da177e4 | 2124 | |
2e4e6a17 | 2125 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2126 | if (!newinfo) { |
2127 | ret = -ENOMEM; | |
2128 | goto out; | |
2129 | } | |
1da177e4 | 2130 | |
9c547959 | 2131 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2132 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2133 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2134 | |
a83d8e8d | 2135 | ret = translate_table(net, table->name, table->valid_hooks, |
31836064 | 2136 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
2137 | repl->num_entries, |
2138 | repl->hook_entry, | |
2139 | repl->underflow); | |
44d34e72 AD |
2140 | if (ret != 0) |
2141 | goto out_free; | |
1da177e4 | 2142 | |
336b517f | 2143 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2144 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2145 | ret = PTR_ERR(new_table); |
2146 | goto out_free; | |
1da177e4 | 2147 | } |
44d34e72 | 2148 | return new_table; |
1da177e4 | 2149 | |
44d34e72 AD |
2150 | out_free: |
2151 | xt_free_table_info(newinfo); | |
2152 | out: | |
2153 | return ERR_PTR(ret); | |
1da177e4 LT |
2154 | } |
2155 | ||
f54e9367 | 2156 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2157 | { |
2e4e6a17 | 2158 | struct xt_table_info *private; |
31836064 | 2159 | void *loc_cpu_entry; |
df200969 | 2160 | struct module *table_owner = table->me; |
72b2b1dd | 2161 | struct ip6t_entry *iter; |
31836064 | 2162 | |
2e4e6a17 | 2163 | private = xt_unregister_table(table); |
1da177e4 LT |
2164 | |
2165 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2166 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2167 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2168 | cleanup_entry(iter, net); |
df200969 AD |
2169 | if (private->number > private->initial_entries) |
2170 | module_put(table_owner); | |
2e4e6a17 | 2171 | xt_free_table_info(private); |
1da177e4 LT |
2172 | } |
2173 | ||
2174 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2175 | static inline bool |
1da177e4 LT |
2176 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2177 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2178 | bool invert) |
1da177e4 LT |
2179 | { |
2180 | return (type == test_type && code >= min_code && code <= max_code) | |
2181 | ^ invert; | |
2182 | } | |
2183 | ||
1d93a9cb | 2184 | static bool |
f7108a20 | 2185 | icmp6_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2186 | { |
5452e425 JE |
2187 | const struct icmp6hdr *ic; |
2188 | struct icmp6hdr _icmph; | |
f7108a20 | 2189 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2190 | |
2191 | /* Must not be a fragment. */ | |
f7108a20 | 2192 | if (par->fragoff != 0) |
1d93a9cb | 2193 | return false; |
1da177e4 | 2194 | |
f7108a20 | 2195 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2196 | if (ic == NULL) { |
2197 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2198 | * can't. Hence, no choice but to drop. |
2199 | */ | |
1da177e4 | 2200 | duprintf("Dropping evil ICMP tinygram.\n"); |
f7108a20 | 2201 | *par->hotdrop = true; |
1d93a9cb | 2202 | return false; |
1da177e4 LT |
2203 | } |
2204 | ||
2205 | return icmp6_type_code_match(icmpinfo->type, | |
2206 | icmpinfo->code[0], | |
2207 | icmpinfo->code[1], | |
2208 | ic->icmp6_type, ic->icmp6_code, | |
2209 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2210 | } | |
2211 | ||
2212 | /* Called when user tries to insert an entry of this type. */ | |
9b4fce7a | 2213 | static bool icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2214 | { |
9b4fce7a | 2215 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2216 | |
7f939713 PM |
2217 | /* Must specify no unknown invflags */ |
2218 | return !(icmpinfo->invflags & ~IP6T_ICMP_INV); | |
1da177e4 LT |
2219 | } |
2220 | ||
2221 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2222 | static struct xt_target ip6t_standard_target __read_mostly = { |
1da177e4 | 2223 | .name = IP6T_STANDARD_TARGET, |
7f939713 | 2224 | .targetsize = sizeof(int), |
4ba351cf | 2225 | .family = NFPROTO_IPV6, |
3bc3fe5e PM |
2226 | #ifdef CONFIG_COMPAT |
2227 | .compatsize = sizeof(compat_int_t), | |
2228 | .compat_from_user = compat_standard_from_user, | |
2229 | .compat_to_user = compat_standard_to_user, | |
2230 | #endif | |
1da177e4 LT |
2231 | }; |
2232 | ||
9f15c530 | 2233 | static struct xt_target ip6t_error_target __read_mostly = { |
1da177e4 LT |
2234 | .name = IP6T_ERROR_TARGET, |
2235 | .target = ip6t_error, | |
7f939713 | 2236 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, |
4ba351cf | 2237 | .family = NFPROTO_IPV6, |
1da177e4 LT |
2238 | }; |
2239 | ||
2240 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2241 | .pf = PF_INET6, | |
2242 | .set_optmin = IP6T_BASE_CTL, | |
2243 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2244 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2245 | #ifdef CONFIG_COMPAT |
2246 | .compat_set = compat_do_ip6t_set_ctl, | |
2247 | #endif | |
1da177e4 LT |
2248 | .get_optmin = IP6T_BASE_CTL, |
2249 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2250 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2251 | #ifdef CONFIG_COMPAT |
2252 | .compat_get = compat_do_ip6t_get_ctl, | |
2253 | #endif | |
16fcec35 | 2254 | .owner = THIS_MODULE, |
1da177e4 LT |
2255 | }; |
2256 | ||
9f15c530 | 2257 | static struct xt_match icmp6_matchstruct __read_mostly = { |
1da177e4 | 2258 | .name = "icmp6", |
9c547959 | 2259 | .match = icmp6_match, |
7f939713 PM |
2260 | .matchsize = sizeof(struct ip6t_icmp), |
2261 | .checkentry = icmp6_checkentry, | |
2262 | .proto = IPPROTO_ICMPV6, | |
4ba351cf | 2263 | .family = NFPROTO_IPV6, |
1da177e4 LT |
2264 | }; |
2265 | ||
3cb609d5 AD |
2266 | static int __net_init ip6_tables_net_init(struct net *net) |
2267 | { | |
383ca5b8 | 2268 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2269 | } |
2270 | ||
2271 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2272 | { | |
383ca5b8 | 2273 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2274 | } |
2275 | ||
2276 | static struct pernet_operations ip6_tables_net_ops = { | |
2277 | .init = ip6_tables_net_init, | |
2278 | .exit = ip6_tables_net_exit, | |
2279 | }; | |
2280 | ||
65b4b4e8 | 2281 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2282 | { |
2283 | int ret; | |
2284 | ||
3cb609d5 | 2285 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2286 | if (ret < 0) |
2287 | goto err1; | |
2e4e6a17 | 2288 | |
1da177e4 | 2289 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2290 | ret = xt_register_target(&ip6t_standard_target); |
2291 | if (ret < 0) | |
2292 | goto err2; | |
2293 | ret = xt_register_target(&ip6t_error_target); | |
2294 | if (ret < 0) | |
2295 | goto err3; | |
2296 | ret = xt_register_match(&icmp6_matchstruct); | |
2297 | if (ret < 0) | |
2298 | goto err4; | |
1da177e4 LT |
2299 | |
2300 | /* Register setsockopt */ | |
2301 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2302 | if (ret < 0) |
2303 | goto err5; | |
1da177e4 | 2304 | |
a887c1c1 | 2305 | printk(KERN_INFO "ip6_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2306 | return 0; |
0eff66e6 PM |
2307 | |
2308 | err5: | |
2309 | xt_unregister_match(&icmp6_matchstruct); | |
2310 | err4: | |
2311 | xt_unregister_target(&ip6t_error_target); | |
2312 | err3: | |
2313 | xt_unregister_target(&ip6t_standard_target); | |
2314 | err2: | |
3cb609d5 | 2315 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2316 | err1: |
2317 | return ret; | |
1da177e4 LT |
2318 | } |
2319 | ||
65b4b4e8 | 2320 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2321 | { |
2322 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2323 | |
a45049c5 PNA |
2324 | xt_unregister_match(&icmp6_matchstruct); |
2325 | xt_unregister_target(&ip6t_error_target); | |
2326 | xt_unregister_target(&ip6t_standard_target); | |
3cb609d5 AD |
2327 | |
2328 | unregister_pernet_subsys(&ip6_tables_net_ops); | |
1da177e4 LT |
2329 | } |
2330 | ||
e674d0f3 | 2331 | /* |
b777e0ce PM |
2332 | * find the offset to specified header or the protocol number of last header |
2333 | * if target < 0. "last header" is transport protocol header, ESP, or | |
2334 | * "No next header". | |
2335 | * | |
2336 | * If target header is found, its offset is set in *offset and return protocol | |
2337 | * number. Otherwise, return -1. | |
2338 | * | |
6d381634 PM |
2339 | * If the first fragment doesn't contain the final protocol header or |
2340 | * NEXTHDR_NONE it is considered invalid. | |
2341 | * | |
b777e0ce PM |
2342 | * Note that non-1st fragment is special case that "the protocol number |
2343 | * of last header" is "next header" field in Fragment header. In this case, | |
2344 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
2345 | * isn't NULL. | |
e674d0f3 | 2346 | * |
e674d0f3 | 2347 | */ |
b777e0ce PM |
2348 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
2349 | int target, unsigned short *fragoff) | |
e674d0f3 | 2350 | { |
6b88dd96 | 2351 | unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); |
0660e03f | 2352 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
e674d0f3 YK |
2353 | unsigned int len = skb->len - start; |
2354 | ||
b777e0ce PM |
2355 | if (fragoff) |
2356 | *fragoff = 0; | |
2357 | ||
e674d0f3 YK |
2358 | while (nexthdr != target) { |
2359 | struct ipv6_opt_hdr _hdr, *hp; | |
2360 | unsigned int hdrlen; | |
2361 | ||
b777e0ce PM |
2362 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
2363 | if (target < 0) | |
2364 | break; | |
6d381634 | 2365 | return -ENOENT; |
b777e0ce PM |
2366 | } |
2367 | ||
e674d0f3 YK |
2368 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
2369 | if (hp == NULL) | |
6d381634 | 2370 | return -EBADMSG; |
e674d0f3 | 2371 | if (nexthdr == NEXTHDR_FRAGMENT) { |
e69a4adc AV |
2372 | unsigned short _frag_off; |
2373 | __be16 *fp; | |
e674d0f3 YK |
2374 | fp = skb_header_pointer(skb, |
2375 | start+offsetof(struct frag_hdr, | |
2376 | frag_off), | |
2377 | sizeof(_frag_off), | |
2378 | &_frag_off); | |
2379 | if (fp == NULL) | |
6d381634 | 2380 | return -EBADMSG; |
e674d0f3 | 2381 | |
b777e0ce PM |
2382 | _frag_off = ntohs(*fp) & ~0x7; |
2383 | if (_frag_off) { | |
2384 | if (target < 0 && | |
2385 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
337dde79 | 2386 | hp->nexthdr == NEXTHDR_NONE)) { |
b777e0ce PM |
2387 | if (fragoff) |
2388 | *fragoff = _frag_off; | |
2389 | return hp->nexthdr; | |
2390 | } | |
6d381634 | 2391 | return -ENOENT; |
b777e0ce | 2392 | } |
e674d0f3 YK |
2393 | hdrlen = 8; |
2394 | } else if (nexthdr == NEXTHDR_AUTH) | |
1ab1457c | 2395 | hdrlen = (hp->hdrlen + 2) << 2; |
e674d0f3 | 2396 | else |
1ab1457c | 2397 | hdrlen = ipv6_optlen(hp); |
e674d0f3 YK |
2398 | |
2399 | nexthdr = hp->nexthdr; | |
2400 | len -= hdrlen; | |
2401 | start += hdrlen; | |
2402 | } | |
2403 | ||
2404 | *offset = start; | |
b777e0ce | 2405 | return nexthdr; |
e674d0f3 YK |
2406 | } |
2407 | ||
1da177e4 LT |
2408 | EXPORT_SYMBOL(ip6t_register_table); |
2409 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2410 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2411 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 2412 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 2413 | |
65b4b4e8 AM |
2414 | module_init(ip6_tables_init); |
2415 | module_exit(ip6_tables_fini); |