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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Packet matching code. | |
3 | * | |
4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
6b7d31fc | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
1da177e4 | 10 | */ |
90e7d4ab | 11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
4fc268d2 | 12 | #include <linux/capability.h> |
14c85021 | 13 | #include <linux/in.h> |
1da177e4 LT |
14 | #include <linux/skbuff.h> |
15 | #include <linux/kmod.h> | |
16 | #include <linux/vmalloc.h> | |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/module.h> | |
4bdbf6c0 | 19 | #include <linux/poison.h> |
1da177e4 | 20 | #include <linux/icmpv6.h> |
1da177e4 | 21 | #include <net/ipv6.h> |
3bc3fe5e | 22 | #include <net/compat.h> |
1da177e4 | 23 | #include <asm/uaccess.h> |
57b47a53 | 24 | #include <linux/mutex.h> |
1da177e4 | 25 | #include <linux/proc_fs.h> |
3bc3fe5e | 26 | #include <linux/err.h> |
c8923c6b | 27 | #include <linux/cpumask.h> |
1da177e4 LT |
28 | |
29 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
2e4e6a17 | 30 | #include <linux/netfilter/x_tables.h> |
f01ffbd6 | 31 | #include <net/netfilter/nf_log.h> |
1da177e4 LT |
32 | |
33 | MODULE_LICENSE("GPL"); | |
34 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
35 | MODULE_DESCRIPTION("IPv6 packet filter"); | |
36 | ||
1da177e4 LT |
37 | /*#define DEBUG_IP_FIREWALL*/ |
38 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
39 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
40 | ||
41 | #ifdef DEBUG_IP_FIREWALL | |
42 | #define dprintf(format, args...) printk(format , ## args) | |
43 | #else | |
44 | #define dprintf(format, args...) | |
45 | #endif | |
46 | ||
47 | #ifdef DEBUG_IP_FIREWALL_USER | |
48 | #define duprintf(format, args...) printk(format , ## args) | |
49 | #else | |
50 | #define duprintf(format, args...) | |
51 | #endif | |
52 | ||
53 | #ifdef CONFIG_NETFILTER_DEBUG | |
54 | #define IP_NF_ASSERT(x) \ | |
55 | do { \ | |
56 | if (!(x)) \ | |
57 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ | |
0dc47877 | 58 | __func__, __FILE__, __LINE__); \ |
1da177e4 LT |
59 | } while(0) |
60 | #else | |
61 | #define IP_NF_ASSERT(x) | |
62 | #endif | |
1da177e4 | 63 | |
1da177e4 LT |
64 | #if 0 |
65 | /* All the better to debug you with... */ | |
66 | #define static | |
67 | #define inline | |
68 | #endif | |
69 | ||
6b7d31fc | 70 | /* |
1da177e4 | 71 | We keep a set of rules for each CPU, so we can avoid write-locking |
6b7d31fc HW |
72 | them in the softirq when updating the counters and therefore |
73 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
74 | context stops packets coming through and allows user context to read | |
75 | the counters or update the rules. | |
1da177e4 | 76 | |
1da177e4 LT |
77 | Hence the start of any table is given by get_table() below. */ |
78 | ||
1da177e4 | 79 | /* Check for an extension */ |
1ab1457c | 80 | int |
1da177e4 LT |
81 | ip6t_ext_hdr(u8 nexthdr) |
82 | { | |
1ab1457c YH |
83 | return ( (nexthdr == IPPROTO_HOPOPTS) || |
84 | (nexthdr == IPPROTO_ROUTING) || | |
85 | (nexthdr == IPPROTO_FRAGMENT) || | |
86 | (nexthdr == IPPROTO_ESP) || | |
87 | (nexthdr == IPPROTO_AH) || | |
88 | (nexthdr == IPPROTO_NONE) || | |
89 | (nexthdr == IPPROTO_DSTOPTS) ); | |
1da177e4 LT |
90 | } |
91 | ||
92 | /* Returns whether matches rule or not. */ | |
022748a9 | 93 | /* Performance critical - called for every packet */ |
1d93a9cb | 94 | static inline bool |
1da177e4 LT |
95 | ip6_packet_match(const struct sk_buff *skb, |
96 | const char *indev, | |
97 | const char *outdev, | |
98 | const struct ip6t_ip6 *ip6info, | |
99 | unsigned int *protoff, | |
cff533ac | 100 | int *fragoff, bool *hotdrop) |
1da177e4 | 101 | { |
1da177e4 | 102 | unsigned long ret; |
0660e03f | 103 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
1da177e4 | 104 | |
e79ec50b | 105 | #define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg))) |
1da177e4 | 106 | |
f2ffd9ee | 107 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
3666ed1c JP |
108 | &ip6info->src), IP6T_INV_SRCIP) || |
109 | FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, | |
110 | &ip6info->dst), IP6T_INV_DSTIP)) { | |
1da177e4 LT |
111 | dprintf("Source or dest mismatch.\n"); |
112 | /* | |
113 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, | |
114 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, | |
115 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); | |
116 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, | |
117 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, | |
118 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ | |
1d93a9cb | 119 | return false; |
1da177e4 LT |
120 | } |
121 | ||
b8dfe498 | 122 | ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask); |
1da177e4 LT |
123 | |
124 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { | |
125 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
126 | indev, ip6info->iniface, | |
127 | ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":""); | |
1d93a9cb | 128 | return false; |
1da177e4 LT |
129 | } |
130 | ||
b8dfe498 | 131 | ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask); |
1da177e4 LT |
132 | |
133 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { | |
134 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
135 | outdev, ip6info->outiface, | |
136 | ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":""); | |
1d93a9cb | 137 | return false; |
1da177e4 LT |
138 | } |
139 | ||
140 | /* ... might want to do something with class and flowlabel here ... */ | |
141 | ||
142 | /* look for the desired protocol header */ | |
143 | if((ip6info->flags & IP6T_F_PROTO)) { | |
b777e0ce PM |
144 | int protohdr; |
145 | unsigned short _frag_off; | |
1da177e4 | 146 | |
b777e0ce | 147 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off); |
51d8b1a6 PM |
148 | if (protohdr < 0) { |
149 | if (_frag_off == 0) | |
cff533ac | 150 | *hotdrop = true; |
1d93a9cb | 151 | return false; |
51d8b1a6 | 152 | } |
b777e0ce | 153 | *fragoff = _frag_off; |
1da177e4 LT |
154 | |
155 | dprintf("Packet protocol %hi ?= %s%hi.\n", | |
1ab1457c | 156 | protohdr, |
1da177e4 LT |
157 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
158 | ip6info->proto); | |
159 | ||
b777e0ce | 160 | if (ip6info->proto == protohdr) { |
1da177e4 | 161 | if(ip6info->invflags & IP6T_INV_PROTO) { |
1d93a9cb | 162 | return false; |
1da177e4 | 163 | } |
1d93a9cb | 164 | return true; |
1da177e4 LT |
165 | } |
166 | ||
167 | /* We need match for the '-p all', too! */ | |
168 | if ((ip6info->proto != 0) && | |
169 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
1d93a9cb | 170 | return false; |
1da177e4 | 171 | } |
1d93a9cb | 172 | return true; |
1da177e4 LT |
173 | } |
174 | ||
175 | /* should be ip6 safe */ | |
022748a9 | 176 | static bool |
1da177e4 LT |
177 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
178 | { | |
179 | if (ipv6->flags & ~IP6T_F_MASK) { | |
180 | duprintf("Unknown flag bits set: %08X\n", | |
181 | ipv6->flags & ~IP6T_F_MASK); | |
ccb79bdc | 182 | return false; |
1da177e4 LT |
183 | } |
184 | if (ipv6->invflags & ~IP6T_INV_MASK) { | |
185 | duprintf("Unknown invflag bits set: %08X\n", | |
186 | ipv6->invflags & ~IP6T_INV_MASK); | |
ccb79bdc | 187 | return false; |
1da177e4 | 188 | } |
ccb79bdc | 189 | return true; |
1da177e4 LT |
190 | } |
191 | ||
192 | static unsigned int | |
7eb35586 | 193 | ip6t_error(struct sk_buff *skb, const struct xt_target_param *par) |
1da177e4 LT |
194 | { |
195 | if (net_ratelimit()) | |
7eb35586 JE |
196 | printk("ip6_tables: error: `%s'\n", |
197 | (const char *)par->targinfo); | |
1da177e4 LT |
198 | |
199 | return NF_DROP; | |
200 | } | |
201 | ||
022748a9 DV |
202 | /* Performance critical - called for every packet */ |
203 | static inline bool | |
f7108a20 JE |
204 | do_match(struct ip6t_entry_match *m, const struct sk_buff *skb, |
205 | struct xt_match_param *par) | |
1da177e4 | 206 | { |
f7108a20 JE |
207 | par->match = m->u.kernel.match; |
208 | par->matchinfo = m->data; | |
209 | ||
1da177e4 | 210 | /* Stop iteration if it doesn't match */ |
f7108a20 | 211 | if (!m->u.kernel.match->match(skb, par)) |
1d93a9cb | 212 | return true; |
1da177e4 | 213 | else |
1d93a9cb | 214 | return false; |
1da177e4 LT |
215 | } |
216 | ||
217 | static inline struct ip6t_entry * | |
218 | get_entry(void *base, unsigned int offset) | |
219 | { | |
220 | return (struct ip6t_entry *)(base + offset); | |
221 | } | |
222 | ||
ba9dda3a | 223 | /* All zeroes == unconditional rule. */ |
022748a9 | 224 | /* Mildly perf critical (only if packet tracing is on) */ |
47901dc2 | 225 | static inline bool unconditional(const struct ip6t_ip6 *ipv6) |
ba9dda3a | 226 | { |
47901dc2 | 227 | static const struct ip6t_ip6 uncond; |
ba9dda3a | 228 | |
47901dc2 | 229 | return memcmp(ipv6, &uncond, sizeof(uncond)) == 0; |
ba9dda3a JK |
230 | } |
231 | ||
232 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
233 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
234 | /* This cries for unification! */ | |
022748a9 | 235 | static const char *const hooknames[] = { |
6e23ae2a PM |
236 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
237 | [NF_INET_LOCAL_IN] = "INPUT", | |
238 | [NF_INET_FORWARD] = "FORWARD", | |
239 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
240 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
241 | }; |
242 | ||
243 | enum nf_ip_trace_comments { | |
244 | NF_IP6_TRACE_COMMENT_RULE, | |
245 | NF_IP6_TRACE_COMMENT_RETURN, | |
246 | NF_IP6_TRACE_COMMENT_POLICY, | |
247 | }; | |
248 | ||
022748a9 | 249 | static const char *const comments[] = { |
ba9dda3a JK |
250 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
251 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
252 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
253 | }; | |
254 | ||
255 | static struct nf_loginfo trace_loginfo = { | |
256 | .type = NF_LOG_TYPE_LOG, | |
257 | .u = { | |
258 | .log = { | |
259 | .level = 4, | |
260 | .logflags = NF_LOG_MASK, | |
261 | }, | |
262 | }, | |
263 | }; | |
264 | ||
022748a9 | 265 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
266 | static inline int |
267 | get_chainname_rulenum(struct ip6t_entry *s, struct ip6t_entry *e, | |
4f2f6f23 JE |
268 | const char *hookname, const char **chainname, |
269 | const char **comment, unsigned int *rulenum) | |
ba9dda3a JK |
270 | { |
271 | struct ip6t_standard_target *t = (void *)ip6t_get_target(s); | |
272 | ||
273 | if (strcmp(t->target.u.kernel.target->name, IP6T_ERROR_TARGET) == 0) { | |
274 | /* Head of user chain: ERROR target with chainname */ | |
275 | *chainname = t->target.data; | |
276 | (*rulenum) = 0; | |
277 | } else if (s == e) { | |
278 | (*rulenum)++; | |
279 | ||
3666ed1c JP |
280 | if (s->target_offset == sizeof(struct ip6t_entry) && |
281 | strcmp(t->target.u.kernel.target->name, | |
282 | IP6T_STANDARD_TARGET) == 0 && | |
283 | t->verdict < 0 && | |
284 | unconditional(&s->ipv6)) { | |
ba9dda3a JK |
285 | /* Tail of chains: STANDARD target (return/policy) */ |
286 | *comment = *chainname == hookname | |
4f2f6f23 JE |
287 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
288 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
289 | } |
290 | return 1; | |
291 | } else | |
292 | (*rulenum)++; | |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
297 | static void trace_packet(struct sk_buff *skb, | |
298 | unsigned int hook, | |
299 | const struct net_device *in, | |
300 | const struct net_device *out, | |
ecb6f85e | 301 | const char *tablename, |
ba9dda3a JK |
302 | struct xt_table_info *private, |
303 | struct ip6t_entry *e) | |
304 | { | |
305 | void *table_base; | |
5452e425 | 306 | const struct ip6t_entry *root; |
4f2f6f23 | 307 | const char *hookname, *chainname, *comment; |
ba9dda3a JK |
308 | unsigned int rulenum = 0; |
309 | ||
ccf5bd8c | 310 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
311 | root = get_entry(table_base, private->hook_entry[hook]); |
312 | ||
4f2f6f23 JE |
313 | hookname = chainname = hooknames[hook]; |
314 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; | |
ba9dda3a JK |
315 | |
316 | IP6T_ENTRY_ITERATE(root, | |
317 | private->size - private->hook_entry[hook], | |
318 | get_chainname_rulenum, | |
319 | e, hookname, &chainname, &comment, &rulenum); | |
320 | ||
321 | nf_log_packet(AF_INET6, hook, skb, in, out, &trace_loginfo, | |
322 | "TRACE: %s:%s:%s:%u ", | |
323 | tablename, chainname, comment, rulenum); | |
324 | } | |
325 | #endif | |
326 | ||
98e86403 JE |
327 | static inline __pure struct ip6t_entry * |
328 | ip6t_next_entry(const struct ip6t_entry *entry) | |
329 | { | |
330 | return (void *)entry + entry->next_offset; | |
331 | } | |
332 | ||
1da177e4 LT |
333 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
334 | unsigned int | |
3db05fea | 335 | ip6t_do_table(struct sk_buff *skb, |
1da177e4 LT |
336 | unsigned int hook, |
337 | const struct net_device *in, | |
338 | const struct net_device *out, | |
fe1cb108 | 339 | struct xt_table *table) |
1da177e4 | 340 | { |
bb70dfa5 JE |
341 | #define tb_comefrom ((struct ip6t_entry *)table_base)->comefrom |
342 | ||
6b7d31fc | 343 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
cff533ac | 344 | bool hotdrop = false; |
1da177e4 LT |
345 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
346 | unsigned int verdict = NF_DROP; | |
347 | const char *indev, *outdev; | |
348 | void *table_base; | |
349 | struct ip6t_entry *e, *back; | |
2e4e6a17 | 350 | struct xt_table_info *private; |
f7108a20 | 351 | struct xt_match_param mtpar; |
7eb35586 | 352 | struct xt_target_param tgpar; |
1da177e4 LT |
353 | |
354 | /* Initialization */ | |
355 | indev = in ? in->name : nulldevname; | |
356 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
357 | /* We handle fragments by dealing with the first fragment as |
358 | * if it was a normal packet. All other fragments are treated | |
359 | * normally, except that they will NEVER match rules that ask | |
360 | * things we don't know, ie. tcp syn flag or ports). If the | |
361 | * rule is also a fragment-specific rule, non-fragments won't | |
362 | * match it. */ | |
f7108a20 | 363 | mtpar.hotdrop = &hotdrop; |
7eb35586 JE |
364 | mtpar.in = tgpar.in = in; |
365 | mtpar.out = tgpar.out = out; | |
916a917d | 366 | mtpar.family = tgpar.family = NFPROTO_IPV6; |
a5e78820 | 367 | mtpar.hooknum = tgpar.hooknum = hook; |
1da177e4 | 368 | |
1da177e4 | 369 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
78454473 | 370 | |
942e4a2b SH |
371 | xt_info_rdlock_bh(); |
372 | private = table->private; | |
373 | table_base = private->entries[smp_processor_id()]; | |
78454473 | 374 | |
2e4e6a17 | 375 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 376 | |
1da177e4 | 377 | /* For return from builtin chain */ |
2e4e6a17 | 378 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
379 | |
380 | do { | |
a1ff4ac8 JE |
381 | struct ip6t_entry_target *t; |
382 | ||
1da177e4 LT |
383 | IP_NF_ASSERT(e); |
384 | IP_NF_ASSERT(back); | |
a1ff4ac8 | 385 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
9452258d JE |
386 | &mtpar.thoff, &mtpar.fragoff, &hotdrop) || |
387 | IP6T_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) { | |
a1ff4ac8 JE |
388 | e = ip6t_next_entry(e); |
389 | continue; | |
390 | } | |
1da177e4 | 391 | |
a1ff4ac8 JE |
392 | ADD_COUNTER(e->counters, |
393 | ntohs(ipv6_hdr(skb)->payload_len) + | |
394 | sizeof(struct ipv6hdr), 1); | |
1da177e4 | 395 | |
a1ff4ac8 JE |
396 | t = ip6t_get_target(e); |
397 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
398 | |
399 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
400 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
a1ff4ac8 JE |
401 | /* The packet is traced: log it */ |
402 | if (unlikely(skb->nf_trace)) | |
403 | trace_packet(skb, hook, in, out, | |
404 | table->name, private, e); | |
ba9dda3a | 405 | #endif |
a1ff4ac8 JE |
406 | /* Standard target? */ |
407 | if (!t->u.kernel.target->target) { | |
408 | int v; | |
409 | ||
410 | v = ((struct ip6t_standard_target *)t)->verdict; | |
411 | if (v < 0) { | |
412 | /* Pop from stack? */ | |
413 | if (v != IP6T_RETURN) { | |
414 | verdict = (unsigned)(-v) - 1; | |
415 | break; | |
1da177e4 | 416 | } |
a1ff4ac8 JE |
417 | e = back; |
418 | back = get_entry(table_base, back->comefrom); | |
419 | continue; | |
420 | } | |
3666ed1c JP |
421 | if (table_base + v != ip6t_next_entry(e) && |
422 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
a1ff4ac8 JE |
423 | /* Save old back ptr in next entry */ |
424 | struct ip6t_entry *next = ip6t_next_entry(e); | |
425 | next->comefrom = (void *)back - table_base; | |
426 | /* set back pointer to next entry */ | |
427 | back = next; | |
428 | } | |
1da177e4 | 429 | |
a1ff4ac8 | 430 | e = get_entry(table_base, v); |
7a6b1c46 JE |
431 | continue; |
432 | } | |
433 | ||
434 | /* Targets which reenter must return | |
435 | abs. verdicts */ | |
436 | tgpar.target = t->u.kernel.target; | |
437 | tgpar.targinfo = t->data; | |
7eb35586 | 438 | |
1da177e4 | 439 | #ifdef CONFIG_NETFILTER_DEBUG |
bb70dfa5 | 440 | tb_comefrom = 0xeeeeeeec; |
1da177e4 | 441 | #endif |
7a6b1c46 | 442 | verdict = t->u.kernel.target->target(skb, &tgpar); |
1da177e4 LT |
443 | |
444 | #ifdef CONFIG_NETFILTER_DEBUG | |
bb70dfa5 | 445 | if (tb_comefrom != 0xeeeeeeec && verdict == IP6T_CONTINUE) { |
7a6b1c46 JE |
446 | printk("Target %s reentered!\n", |
447 | t->u.kernel.target->name); | |
448 | verdict = NF_DROP; | |
1da177e4 | 449 | } |
bb70dfa5 | 450 | tb_comefrom = 0x57acc001; |
7a6b1c46 JE |
451 | #endif |
452 | if (verdict == IP6T_CONTINUE) | |
453 | e = ip6t_next_entry(e); | |
454 | else | |
455 | /* Verdict */ | |
456 | break; | |
1da177e4 LT |
457 | } while (!hotdrop); |
458 | ||
459 | #ifdef CONFIG_NETFILTER_DEBUG | |
bb70dfa5 | 460 | tb_comefrom = NETFILTER_LINK_POISON; |
1da177e4 | 461 | #endif |
942e4a2b | 462 | xt_info_rdunlock_bh(); |
1da177e4 LT |
463 | |
464 | #ifdef DEBUG_ALLOW_ALL | |
465 | return NF_ACCEPT; | |
466 | #else | |
467 | if (hotdrop) | |
468 | return NF_DROP; | |
469 | else return verdict; | |
470 | #endif | |
bb70dfa5 JE |
471 | |
472 | #undef tb_comefrom | |
1da177e4 LT |
473 | } |
474 | ||
1da177e4 LT |
475 | /* Figures out from what hook each rule can be called: returns 0 if |
476 | there are loops. Puts hook bitmask in comefrom. */ | |
477 | static int | |
2e4e6a17 | 478 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 479 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
480 | { |
481 | unsigned int hook; | |
482 | ||
483 | /* No recursion; use packet counter to save back ptrs (reset | |
484 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 485 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 486 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 487 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
488 | |
489 | if (!(valid_hooks & (1 << hook))) | |
490 | continue; | |
491 | ||
492 | /* Set initial back pointer. */ | |
493 | e->counters.pcnt = pos; | |
494 | ||
495 | for (;;) { | |
496 | struct ip6t_standard_target *t | |
497 | = (void *)ip6t_get_target(e); | |
9c547959 | 498 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 499 | |
6e23ae2a | 500 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
501 | printk("iptables: loop hook %u pos %u %08X.\n", |
502 | hook, pos, e->comefrom); | |
503 | return 0; | |
504 | } | |
9c547959 | 505 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
506 | |
507 | /* Unconditional return/END. */ | |
3666ed1c JP |
508 | if ((e->target_offset == sizeof(struct ip6t_entry) && |
509 | (strcmp(t->target.u.user.name, | |
510 | IP6T_STANDARD_TARGET) == 0) && | |
511 | t->verdict < 0 && | |
512 | unconditional(&e->ipv6)) || visited) { | |
1da177e4 LT |
513 | unsigned int oldpos, size; |
514 | ||
1f9352ae PM |
515 | if ((strcmp(t->target.u.user.name, |
516 | IP6T_STANDARD_TARGET) == 0) && | |
517 | t->verdict < -NF_MAX_VERDICT - 1) { | |
74c9c0c1 DM |
518 | duprintf("mark_source_chains: bad " |
519 | "negative verdict (%i)\n", | |
520 | t->verdict); | |
521 | return 0; | |
522 | } | |
523 | ||
1da177e4 LT |
524 | /* Return: backtrack through the last |
525 | big jump. */ | |
526 | do { | |
6e23ae2a | 527 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
528 | #ifdef DEBUG_IP_FIREWALL_USER |
529 | if (e->comefrom | |
6e23ae2a | 530 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
531 | duprintf("Back unset " |
532 | "on hook %u " | |
533 | "rule %u\n", | |
534 | hook, pos); | |
535 | } | |
536 | #endif | |
537 | oldpos = pos; | |
538 | pos = e->counters.pcnt; | |
539 | e->counters.pcnt = 0; | |
540 | ||
541 | /* We're at the start. */ | |
542 | if (pos == oldpos) | |
543 | goto next; | |
544 | ||
545 | e = (struct ip6t_entry *) | |
31836064 | 546 | (entry0 + pos); |
1da177e4 LT |
547 | } while (oldpos == pos + e->next_offset); |
548 | ||
549 | /* Move along one */ | |
550 | size = e->next_offset; | |
551 | e = (struct ip6t_entry *) | |
31836064 | 552 | (entry0 + pos + size); |
1da177e4 LT |
553 | e->counters.pcnt = pos; |
554 | pos += size; | |
555 | } else { | |
556 | int newpos = t->verdict; | |
557 | ||
558 | if (strcmp(t->target.u.user.name, | |
3666ed1c JP |
559 | IP6T_STANDARD_TARGET) == 0 && |
560 | newpos >= 0) { | |
74c9c0c1 DM |
561 | if (newpos > newinfo->size - |
562 | sizeof(struct ip6t_entry)) { | |
563 | duprintf("mark_source_chains: " | |
564 | "bad verdict (%i)\n", | |
565 | newpos); | |
566 | return 0; | |
567 | } | |
1da177e4 LT |
568 | /* This a jump; chase it. */ |
569 | duprintf("Jump rule %u -> %u\n", | |
570 | pos, newpos); | |
571 | } else { | |
572 | /* ... this is a fallthru */ | |
573 | newpos = pos + e->next_offset; | |
574 | } | |
575 | e = (struct ip6t_entry *) | |
31836064 | 576 | (entry0 + newpos); |
1da177e4 LT |
577 | e->counters.pcnt = pos; |
578 | pos = newpos; | |
579 | } | |
580 | } | |
581 | next: | |
582 | duprintf("Finished chain %u\n", hook); | |
583 | } | |
584 | return 1; | |
585 | } | |
586 | ||
022748a9 | 587 | static int |
1da177e4 LT |
588 | cleanup_match(struct ip6t_entry_match *m, unsigned int *i) |
589 | { | |
6be3d859 JE |
590 | struct xt_mtdtor_param par; |
591 | ||
1da177e4 LT |
592 | if (i && (*i)-- == 0) |
593 | return 1; | |
594 | ||
6be3d859 JE |
595 | par.match = m->u.kernel.match; |
596 | par.matchinfo = m->data; | |
916a917d | 597 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
598 | if (par.match->destroy != NULL) |
599 | par.match->destroy(&par); | |
600 | module_put(par.match->me); | |
1da177e4 LT |
601 | return 0; |
602 | } | |
603 | ||
022748a9 | 604 | static int |
f173c8a1 PM |
605 | check_entry(struct ip6t_entry *e, const char *name) |
606 | { | |
607 | struct ip6t_entry_target *t; | |
608 | ||
609 | if (!ip6_checkentry(&e->ipv6)) { | |
610 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
611 | return -EINVAL; | |
612 | } | |
613 | ||
614 | if (e->target_offset + sizeof(struct ip6t_entry_target) > | |
615 | e->next_offset) | |
616 | return -EINVAL; | |
617 | ||
618 | t = ip6t_get_target(e); | |
619 | if (e->target_offset + t->u.target_size > e->next_offset) | |
620 | return -EINVAL; | |
621 | ||
622 | return 0; | |
623 | } | |
624 | ||
9b4fce7a JE |
625 | static int check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par, |
626 | unsigned int *i) | |
f173c8a1 | 627 | { |
9b4fce7a | 628 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
629 | int ret; |
630 | ||
9b4fce7a JE |
631 | par->match = m->u.kernel.match; |
632 | par->matchinfo = m->data; | |
633 | ||
916a917d | 634 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 635 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
367c6790 | 636 | if (ret < 0) { |
f173c8a1 | 637 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 638 | par.match->name); |
367c6790 | 639 | return ret; |
f173c8a1 | 640 | } |
367c6790 JE |
641 | ++*i; |
642 | return 0; | |
f173c8a1 PM |
643 | } |
644 | ||
022748a9 | 645 | static int |
9b4fce7a | 646 | find_check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par, |
f173c8a1 | 647 | unsigned int *i) |
1da177e4 | 648 | { |
6709dbbb | 649 | struct xt_match *match; |
3cdc7c95 | 650 | int ret; |
1da177e4 | 651 | |
2e4e6a17 | 652 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, |
9c547959 | 653 | m->u.user.revision), |
6b7d31fc HW |
654 | "ip6t_%s", m->u.user.name); |
655 | if (IS_ERR(match) || !match) { | |
f173c8a1 | 656 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
6b7d31fc | 657 | return match ? PTR_ERR(match) : -ENOENT; |
1da177e4 LT |
658 | } |
659 | m->u.kernel.match = match; | |
1da177e4 | 660 | |
9b4fce7a | 661 | ret = check_match(m, par, i); |
3cdc7c95 PM |
662 | if (ret) |
663 | goto err; | |
664 | ||
1da177e4 | 665 | return 0; |
3cdc7c95 PM |
666 | err: |
667 | module_put(m->u.kernel.match->me); | |
668 | return ret; | |
1da177e4 LT |
669 | } |
670 | ||
022748a9 | 671 | static int check_target(struct ip6t_entry *e, const char *name) |
1da177e4 | 672 | { |
af5d6dc2 JE |
673 | struct ip6t_entry_target *t = ip6t_get_target(e); |
674 | struct xt_tgchk_param par = { | |
675 | .table = name, | |
676 | .entryinfo = e, | |
677 | .target = t->u.kernel.target, | |
678 | .targinfo = t->data, | |
679 | .hook_mask = e->comefrom, | |
916a917d | 680 | .family = NFPROTO_IPV6, |
af5d6dc2 | 681 | }; |
1da177e4 | 682 | int ret; |
1da177e4 | 683 | |
f173c8a1 | 684 | t = ip6t_get_target(e); |
916a917d | 685 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 686 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
367c6790 | 687 | if (ret < 0) { |
f173c8a1 PM |
688 | duprintf("ip_tables: check failed for `%s'.\n", |
689 | t->u.kernel.target->name); | |
367c6790 | 690 | return ret; |
1da177e4 | 691 | } |
367c6790 | 692 | return 0; |
f173c8a1 | 693 | } |
1da177e4 | 694 | |
022748a9 | 695 | static int |
f173c8a1 PM |
696 | find_check_entry(struct ip6t_entry *e, const char *name, unsigned int size, |
697 | unsigned int *i) | |
698 | { | |
699 | struct ip6t_entry_target *t; | |
700 | struct xt_target *target; | |
701 | int ret; | |
702 | unsigned int j; | |
9b4fce7a | 703 | struct xt_mtchk_param mtpar; |
f173c8a1 PM |
704 | |
705 | ret = check_entry(e, name); | |
706 | if (ret) | |
707 | return ret; | |
590bdf7f | 708 | |
1da177e4 | 709 | j = 0; |
9b4fce7a JE |
710 | mtpar.table = name; |
711 | mtpar.entryinfo = &e->ipv6; | |
712 | mtpar.hook_mask = e->comefrom; | |
916a917d | 713 | mtpar.family = NFPROTO_IPV6; |
9b4fce7a | 714 | ret = IP6T_MATCH_ITERATE(e, find_check_match, &mtpar, &j); |
1da177e4 LT |
715 | if (ret != 0) |
716 | goto cleanup_matches; | |
717 | ||
718 | t = ip6t_get_target(e); | |
2e4e6a17 HW |
719 | target = try_then_request_module(xt_find_target(AF_INET6, |
720 | t->u.user.name, | |
721 | t->u.user.revision), | |
6b7d31fc HW |
722 | "ip6t_%s", t->u.user.name); |
723 | if (IS_ERR(target) || !target) { | |
f173c8a1 | 724 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
6b7d31fc | 725 | ret = target ? PTR_ERR(target) : -ENOENT; |
1da177e4 LT |
726 | goto cleanup_matches; |
727 | } | |
728 | t->u.kernel.target = target; | |
6b7d31fc | 729 | |
f173c8a1 | 730 | ret = check_target(e, name); |
3cdc7c95 PM |
731 | if (ret) |
732 | goto err; | |
733 | ||
1da177e4 LT |
734 | (*i)++; |
735 | return 0; | |
3cdc7c95 PM |
736 | err: |
737 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
738 | cleanup_matches: |
739 | IP6T_MATCH_ITERATE(e, cleanup_match, &j); | |
740 | return ret; | |
741 | } | |
742 | ||
e2fe35c1 JE |
743 | static bool check_underflow(struct ip6t_entry *e) |
744 | { | |
745 | const struct ip6t_entry_target *t; | |
746 | unsigned int verdict; | |
747 | ||
748 | if (!unconditional(&e->ipv6)) | |
749 | return false; | |
750 | t = ip6t_get_target(e); | |
751 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) | |
752 | return false; | |
753 | verdict = ((struct ip6t_standard_target *)t)->verdict; | |
754 | verdict = -verdict - 1; | |
755 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
756 | } | |
757 | ||
022748a9 | 758 | static int |
1da177e4 | 759 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 760 | struct xt_table_info *newinfo, |
1da177e4 LT |
761 | unsigned char *base, |
762 | unsigned char *limit, | |
763 | const unsigned int *hook_entries, | |
764 | const unsigned int *underflows, | |
a7d51738 | 765 | unsigned int valid_hooks, |
1da177e4 LT |
766 | unsigned int *i) |
767 | { | |
768 | unsigned int h; | |
769 | ||
3666ed1c JP |
770 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
771 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
1da177e4 LT |
772 | duprintf("Bad offset %p\n", e); |
773 | return -EINVAL; | |
774 | } | |
775 | ||
776 | if (e->next_offset | |
777 | < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) { | |
778 | duprintf("checking: element %p size %u\n", | |
779 | e, e->next_offset); | |
780 | return -EINVAL; | |
781 | } | |
782 | ||
783 | /* Check hooks & underflows */ | |
6e23ae2a | 784 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
785 | if (!(valid_hooks & (1 << h))) |
786 | continue; | |
1da177e4 LT |
787 | if ((unsigned char *)e - base == hook_entries[h]) |
788 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 789 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
790 | if (!check_underflow(e)) { |
791 | pr_err("Underflows must be unconditional and " | |
792 | "use the STANDARD target with " | |
793 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
794 | return -EINVAL; |
795 | } | |
1da177e4 | 796 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 797 | } |
1da177e4 LT |
798 | } |
799 | ||
1da177e4 | 800 | /* Clear counters and comefrom */ |
2e4e6a17 | 801 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
802 | e->comefrom = 0; |
803 | ||
804 | (*i)++; | |
805 | return 0; | |
806 | } | |
807 | ||
022748a9 | 808 | static int |
1da177e4 LT |
809 | cleanup_entry(struct ip6t_entry *e, unsigned int *i) |
810 | { | |
a2df1648 | 811 | struct xt_tgdtor_param par; |
1da177e4 LT |
812 | struct ip6t_entry_target *t; |
813 | ||
814 | if (i && (*i)-- == 0) | |
815 | return 1; | |
816 | ||
817 | /* Cleanup all matches */ | |
818 | IP6T_MATCH_ITERATE(e, cleanup_match, NULL); | |
819 | t = ip6t_get_target(e); | |
a2df1648 JE |
820 | |
821 | par.target = t->u.kernel.target; | |
822 | par.targinfo = t->data; | |
916a917d | 823 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
824 | if (par.target->destroy != NULL) |
825 | par.target->destroy(&par); | |
826 | module_put(par.target->me); | |
1da177e4 LT |
827 | return 0; |
828 | } | |
829 | ||
830 | /* Checks and translates the user-supplied table segment (held in | |
831 | newinfo) */ | |
832 | static int | |
833 | translate_table(const char *name, | |
834 | unsigned int valid_hooks, | |
2e4e6a17 | 835 | struct xt_table_info *newinfo, |
31836064 | 836 | void *entry0, |
1da177e4 LT |
837 | unsigned int size, |
838 | unsigned int number, | |
839 | const unsigned int *hook_entries, | |
840 | const unsigned int *underflows) | |
841 | { | |
842 | unsigned int i; | |
843 | int ret; | |
844 | ||
845 | newinfo->size = size; | |
846 | newinfo->number = number; | |
847 | ||
848 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 849 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
850 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
851 | newinfo->underflow[i] = 0xFFFFFFFF; | |
852 | } | |
853 | ||
854 | duprintf("translate_table: size %u\n", newinfo->size); | |
855 | i = 0; | |
856 | /* Walk through entries, checking offsets. */ | |
31836064 | 857 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
858 | check_entry_size_and_hooks, |
859 | newinfo, | |
31836064 ED |
860 | entry0, |
861 | entry0 + size, | |
a7d51738 | 862 | hook_entries, underflows, valid_hooks, &i); |
1da177e4 LT |
863 | if (ret != 0) |
864 | return ret; | |
865 | ||
866 | if (i != number) { | |
867 | duprintf("translate_table: %u not %u entries\n", | |
868 | i, number); | |
869 | return -EINVAL; | |
870 | } | |
871 | ||
872 | /* Check hooks all assigned */ | |
6e23ae2a | 873 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
874 | /* Only hooks which are valid */ |
875 | if (!(valid_hooks & (1 << i))) | |
876 | continue; | |
877 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
878 | duprintf("Invalid hook entry %u %u\n", | |
879 | i, hook_entries[i]); | |
880 | return -EINVAL; | |
881 | } | |
882 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
883 | duprintf("Invalid underflow %u %u\n", | |
884 | i, underflows[i]); | |
885 | return -EINVAL; | |
886 | } | |
887 | } | |
888 | ||
74c9c0c1 DM |
889 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
890 | return -ELOOP; | |
891 | ||
1da177e4 LT |
892 | /* Finally, each sanity check must pass */ |
893 | i = 0; | |
31836064 | 894 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
f173c8a1 | 895 | find_check_entry, name, size, &i); |
1da177e4 | 896 | |
74c9c0c1 DM |
897 | if (ret != 0) { |
898 | IP6T_ENTRY_ITERATE(entry0, newinfo->size, | |
899 | cleanup_entry, &i); | |
900 | return ret; | |
901 | } | |
1da177e4 LT |
902 | |
903 | /* And one copy for every other CPU */ | |
6f912042 | 904 | for_each_possible_cpu(i) { |
31836064 ED |
905 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
906 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
907 | } |
908 | ||
9c547959 | 909 | return ret; |
1da177e4 LT |
910 | } |
911 | ||
1da177e4 LT |
912 | /* Gets counters. */ |
913 | static inline int | |
914 | add_entry_to_counter(const struct ip6t_entry *e, | |
2e4e6a17 | 915 | struct xt_counters total[], |
1da177e4 LT |
916 | unsigned int *i) |
917 | { | |
918 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
919 | ||
920 | (*i)++; | |
921 | return 0; | |
922 | } | |
923 | ||
31836064 ED |
924 | static inline int |
925 | set_entry_to_counter(const struct ip6t_entry *e, | |
926 | struct ip6t_counters total[], | |
927 | unsigned int *i) | |
928 | { | |
929 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
930 | ||
931 | (*i)++; | |
932 | return 0; | |
933 | } | |
934 | ||
1da177e4 | 935 | static void |
2e4e6a17 HW |
936 | get_counters(const struct xt_table_info *t, |
937 | struct xt_counters counters[]) | |
1da177e4 LT |
938 | { |
939 | unsigned int cpu; | |
940 | unsigned int i; | |
31836064 ED |
941 | unsigned int curcpu; |
942 | ||
943 | /* Instead of clearing (by a previous call to memset()) | |
944 | * the counters and using adds, we set the counters | |
945 | * with data used by 'current' CPU | |
942e4a2b SH |
946 | * |
947 | * Bottom half has to be disabled to prevent deadlock | |
948 | * if new softirq were to run and call ipt_do_table | |
31836064 | 949 | */ |
942e4a2b SH |
950 | local_bh_disable(); |
951 | curcpu = smp_processor_id(); | |
31836064 ED |
952 | |
953 | i = 0; | |
954 | IP6T_ENTRY_ITERATE(t->entries[curcpu], | |
955 | t->size, | |
956 | set_entry_to_counter, | |
957 | counters, | |
958 | &i); | |
1da177e4 | 959 | |
6f912042 | 960 | for_each_possible_cpu(cpu) { |
31836064 ED |
961 | if (cpu == curcpu) |
962 | continue; | |
1da177e4 | 963 | i = 0; |
942e4a2b | 964 | xt_info_wrlock(cpu); |
31836064 | 965 | IP6T_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
966 | t->size, |
967 | add_entry_to_counter, | |
968 | counters, | |
969 | &i); | |
942e4a2b | 970 | xt_info_wrunlock(cpu); |
1da177e4 | 971 | } |
78454473 SH |
972 | local_bh_enable(); |
973 | } | |
974 | ||
022748a9 | 975 | static struct xt_counters *alloc_counters(struct xt_table *table) |
1da177e4 | 976 | { |
ed1a6f5e | 977 | unsigned int countersize; |
2e4e6a17 | 978 | struct xt_counters *counters; |
78454473 | 979 | struct xt_table_info *private = table->private; |
1da177e4 LT |
980 | |
981 | /* We need atomic snapshot of counters: rest doesn't change | |
982 | (other than comefrom, which userspace doesn't care | |
983 | about). */ | |
2e4e6a17 | 984 | countersize = sizeof(struct xt_counters) * private->number; |
3b84e92b | 985 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
986 | |
987 | if (counters == NULL) | |
942e4a2b | 988 | return ERR_PTR(-ENOMEM); |
78454473 | 989 | |
942e4a2b | 990 | get_counters(private, counters); |
78454473 | 991 | |
49a88d18 | 992 | return counters; |
ed1a6f5e PM |
993 | } |
994 | ||
995 | static int | |
996 | copy_entries_to_user(unsigned int total_size, | |
997 | struct xt_table *table, | |
998 | void __user *userptr) | |
999 | { | |
1000 | unsigned int off, num; | |
1001 | struct ip6t_entry *e; | |
1002 | struct xt_counters *counters; | |
5452e425 | 1003 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 1004 | int ret = 0; |
5452e425 | 1005 | const void *loc_cpu_entry; |
ed1a6f5e PM |
1006 | |
1007 | counters = alloc_counters(table); | |
1008 | if (IS_ERR(counters)) | |
1009 | return PTR_ERR(counters); | |
1010 | ||
9c547959 PM |
1011 | /* choose the copy that is on our node/cpu, ... |
1012 | * This choice is lazy (because current thread is | |
1013 | * allowed to migrate to another cpu) | |
1014 | */ | |
2e4e6a17 | 1015 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 1016 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
1017 | ret = -EFAULT; |
1018 | goto free_counters; | |
1019 | } | |
1020 | ||
1021 | /* FIXME: use iterator macros --RR */ | |
1022 | /* ... then go back and fix counters and names */ | |
1023 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
1024 | unsigned int i; | |
5452e425 JE |
1025 | const struct ip6t_entry_match *m; |
1026 | const struct ip6t_entry_target *t; | |
1da177e4 | 1027 | |
31836064 | 1028 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
1029 | if (copy_to_user(userptr + off |
1030 | + offsetof(struct ip6t_entry, counters), | |
1031 | &counters[num], | |
1032 | sizeof(counters[num])) != 0) { | |
1033 | ret = -EFAULT; | |
1034 | goto free_counters; | |
1035 | } | |
1036 | ||
1037 | for (i = sizeof(struct ip6t_entry); | |
1038 | i < e->target_offset; | |
1039 | i += m->u.match_size) { | |
1040 | m = (void *)e + i; | |
1041 | ||
1042 | if (copy_to_user(userptr + off + i | |
1043 | + offsetof(struct ip6t_entry_match, | |
1044 | u.user.name), | |
1045 | m->u.kernel.match->name, | |
1046 | strlen(m->u.kernel.match->name)+1) | |
1047 | != 0) { | |
1048 | ret = -EFAULT; | |
1049 | goto free_counters; | |
1050 | } | |
1051 | } | |
1052 | ||
1053 | t = ip6t_get_target(e); | |
1054 | if (copy_to_user(userptr + off + e->target_offset | |
1055 | + offsetof(struct ip6t_entry_target, | |
1056 | u.user.name), | |
1057 | t->u.kernel.target->name, | |
1058 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1059 | ret = -EFAULT; | |
1060 | goto free_counters; | |
1061 | } | |
1062 | } | |
1063 | ||
1064 | free_counters: | |
1065 | vfree(counters); | |
1066 | return ret; | |
1067 | } | |
1068 | ||
3bc3fe5e PM |
1069 | #ifdef CONFIG_COMPAT |
1070 | static void compat_standard_from_user(void *dst, void *src) | |
1071 | { | |
1072 | int v = *(compat_int_t *)src; | |
1073 | ||
1074 | if (v > 0) | |
1075 | v += xt_compat_calc_jump(AF_INET6, v); | |
1076 | memcpy(dst, &v, sizeof(v)); | |
1077 | } | |
1078 | ||
1079 | static int compat_standard_to_user(void __user *dst, void *src) | |
1080 | { | |
1081 | compat_int_t cv = *(int *)src; | |
1082 | ||
1083 | if (cv > 0) | |
1084 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1085 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1086 | } | |
1087 | ||
1088 | static inline int | |
1089 | compat_calc_match(struct ip6t_entry_match *m, int *size) | |
1090 | { | |
1091 | *size += xt_compat_match_offset(m->u.kernel.match); | |
1092 | return 0; | |
1093 | } | |
1094 | ||
1095 | static int compat_calc_entry(struct ip6t_entry *e, | |
1096 | const struct xt_table_info *info, | |
1097 | void *base, struct xt_table_info *newinfo) | |
1098 | { | |
1099 | struct ip6t_entry_target *t; | |
1100 | unsigned int entry_offset; | |
1101 | int off, i, ret; | |
1102 | ||
1103 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1104 | entry_offset = (void *)e - base; | |
1105 | IP6T_MATCH_ITERATE(e, compat_calc_match, &off); | |
1106 | t = ip6t_get_target(e); | |
1107 | off += xt_compat_target_offset(t->u.kernel.target); | |
1108 | newinfo->size -= off; | |
1109 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1110 | if (ret) | |
1111 | return ret; | |
1112 | ||
1113 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1114 | if (info->hook_entry[i] && | |
1115 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1116 | newinfo->hook_entry[i] -= off; | |
1117 | if (info->underflow[i] && | |
1118 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1119 | newinfo->underflow[i] -= off; | |
1120 | } | |
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | static int compat_table_info(const struct xt_table_info *info, | |
1125 | struct xt_table_info *newinfo) | |
1126 | { | |
1127 | void *loc_cpu_entry; | |
1128 | ||
1129 | if (!newinfo || !info) | |
1130 | return -EINVAL; | |
1131 | ||
1132 | /* we dont care about newinfo->entries[] */ | |
1133 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1134 | newinfo->initial_entries = 0; | |
1135 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
1136 | return IP6T_ENTRY_ITERATE(loc_cpu_entry, info->size, | |
1137 | compat_calc_entry, info, loc_cpu_entry, | |
1138 | newinfo); | |
1139 | } | |
1140 | #endif | |
1141 | ||
336b517f | 1142 | static int get_info(struct net *net, void __user *user, 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; |
433665c9 | 1167 | |
3bc3fe5e PM |
1168 | #ifdef CONFIG_COMPAT |
1169 | if (compat) { | |
1170 | struct xt_table_info tmp; | |
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 |
336b517f | 1202 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, int *len) |
1da177e4 LT |
1203 | { |
1204 | int ret; | |
d924357c | 1205 | struct ip6t_get_entries get; |
2e4e6a17 | 1206 | struct xt_table *t; |
1da177e4 | 1207 | |
d924357c | 1208 | if (*len < sizeof(get)) { |
c9d8fe13 | 1209 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1210 | return -EINVAL; |
1211 | } | |
1212 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1213 | return -EFAULT; | |
1214 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1215 | duprintf("get_entries: %u != %zu\n", |
1216 | *len, sizeof(get) + get.size); | |
d924357c PM |
1217 | return -EINVAL; |
1218 | } | |
1219 | ||
336b517f | 1220 | t = xt_find_table_lock(net, AF_INET6, get.name); |
6b7d31fc | 1221 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
1222 | struct xt_table_info *private = t->private; |
1223 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1224 | if (get.size == private->size) |
2e4e6a17 | 1225 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1226 | t, uptr->entrytable); |
1227 | else { | |
1228 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1229 | private->size, get.size); |
544473c1 | 1230 | ret = -EAGAIN; |
1da177e4 | 1231 | } |
6b7d31fc | 1232 | module_put(t->me); |
2e4e6a17 | 1233 | xt_table_unlock(t); |
1da177e4 | 1234 | } else |
6b7d31fc | 1235 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1236 | |
1237 | return ret; | |
1238 | } | |
1239 | ||
1240 | static int | |
336b517f | 1241 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1242 | struct xt_table_info *newinfo, unsigned int num_counters, |
1243 | void __user *counters_ptr) | |
1da177e4 LT |
1244 | { |
1245 | int ret; | |
2e4e6a17 | 1246 | struct xt_table *t; |
3bc3fe5e | 1247 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1248 | struct xt_counters *counters; |
5452e425 | 1249 | const void *loc_cpu_old_entry; |
1da177e4 | 1250 | |
3bc3fe5e PM |
1251 | ret = 0; |
1252 | counters = vmalloc_node(num_counters * sizeof(struct xt_counters), | |
3b84e92b | 1253 | numa_node_id()); |
1da177e4 LT |
1254 | if (!counters) { |
1255 | ret = -ENOMEM; | |
3bc3fe5e | 1256 | goto out; |
1da177e4 | 1257 | } |
1da177e4 | 1258 | |
336b517f | 1259 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1260 | "ip6table_%s", name); |
6b7d31fc HW |
1261 | if (!t || IS_ERR(t)) { |
1262 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1263 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1264 | } |
1da177e4 LT |
1265 | |
1266 | /* You lied! */ | |
3bc3fe5e | 1267 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1268 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1269 | valid_hooks, t->valid_hooks); |
1da177e4 | 1270 | ret = -EINVAL; |
6b7d31fc | 1271 | goto put_module; |
1da177e4 LT |
1272 | } |
1273 | ||
3bc3fe5e | 1274 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1275 | if (!oldinfo) |
1276 | goto put_module; | |
1277 | ||
1278 | /* Update module usage count based on number of rules */ | |
1279 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1280 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1281 | if ((oldinfo->number > oldinfo->initial_entries) || |
1282 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1283 | module_put(t->me); |
1284 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1285 | (newinfo->number <= oldinfo->initial_entries)) | |
1286 | module_put(t->me); | |
1287 | ||
942e4a2b | 1288 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1289 | get_counters(oldinfo, counters); |
942e4a2b | 1290 | |
1da177e4 | 1291 | /* Decrease module usage counts and free resource */ |
31836064 | 1292 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
3bc3fe5e PM |
1293 | IP6T_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry, |
1294 | NULL); | |
2e4e6a17 | 1295 | xt_free_table_info(oldinfo); |
3bc3fe5e PM |
1296 | if (copy_to_user(counters_ptr, counters, |
1297 | sizeof(struct xt_counters) * num_counters) != 0) | |
1da177e4 LT |
1298 | ret = -EFAULT; |
1299 | vfree(counters); | |
2e4e6a17 | 1300 | xt_table_unlock(t); |
1da177e4 LT |
1301 | return ret; |
1302 | ||
1303 | put_module: | |
1304 | module_put(t->me); | |
2e4e6a17 | 1305 | xt_table_unlock(t); |
1da177e4 | 1306 | free_newinfo_counters_untrans: |
1da177e4 | 1307 | vfree(counters); |
3bc3fe5e PM |
1308 | out: |
1309 | return ret; | |
1310 | } | |
1311 | ||
1312 | static int | |
336b517f | 1313 | do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1314 | { |
1315 | int ret; | |
1316 | struct ip6t_replace tmp; | |
1317 | struct xt_table_info *newinfo; | |
1318 | void *loc_cpu_entry; | |
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 | ||
1339 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
1340 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, | |
1341 | tmp.hook_entry, tmp.underflow); | |
1342 | if (ret != 0) | |
1343 | goto free_newinfo; | |
1344 | ||
1345 | duprintf("ip_tables: Translated table\n"); | |
1346 | ||
336b517f | 1347 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1348 | tmp.num_counters, tmp.counters); |
1349 | if (ret) | |
1350 | goto free_newinfo_untrans; | |
1351 | return 0; | |
1352 | ||
1353 | free_newinfo_untrans: | |
1354 | IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); | |
1da177e4 | 1355 | free_newinfo: |
2e4e6a17 | 1356 | xt_free_table_info(newinfo); |
1da177e4 LT |
1357 | return ret; |
1358 | } | |
1359 | ||
942e4a2b SH |
1360 | /* We're lazy, and add to the first CPU; overflow works its fey magic |
1361 | * and everything is OK. */ | |
1362 | static int | |
1363 | add_counter_to_entry(struct ip6t_entry *e, | |
1364 | const struct xt_counters addme[], | |
1365 | unsigned int *i) | |
1366 | { | |
1367 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1368 | ||
1369 | (*i)++; | |
1370 | return 0; | |
1371 | } | |
1372 | ||
1da177e4 | 1373 | static int |
336b517f AD |
1374 | do_add_counters(struct net *net, void __user *user, unsigned int len, |
1375 | int compat) | |
1da177e4 | 1376 | { |
942e4a2b | 1377 | unsigned int i, curcpu; |
3bc3fe5e PM |
1378 | struct xt_counters_info tmp; |
1379 | struct xt_counters *paddc; | |
1380 | unsigned int num_counters; | |
1381 | char *name; | |
1382 | int size; | |
1383 | void *ptmp; | |
2e4e6a17 | 1384 | struct xt_table *t; |
5452e425 | 1385 | const struct xt_table_info *private; |
6b7d31fc | 1386 | int ret = 0; |
5452e425 | 1387 | const void *loc_cpu_entry; |
3bc3fe5e PM |
1388 | #ifdef CONFIG_COMPAT |
1389 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1390 | |
3bc3fe5e PM |
1391 | if (compat) { |
1392 | ptmp = &compat_tmp; | |
1393 | size = sizeof(struct compat_xt_counters_info); | |
1394 | } else | |
1395 | #endif | |
1396 | { | |
1397 | ptmp = &tmp; | |
1398 | size = sizeof(struct xt_counters_info); | |
1399 | } | |
1400 | ||
1401 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1402 | return -EFAULT; |
1403 | ||
3bc3fe5e PM |
1404 | #ifdef CONFIG_COMPAT |
1405 | if (compat) { | |
1406 | num_counters = compat_tmp.num_counters; | |
1407 | name = compat_tmp.name; | |
1408 | } else | |
1409 | #endif | |
1410 | { | |
1411 | num_counters = tmp.num_counters; | |
1412 | name = tmp.name; | |
1413 | } | |
1414 | ||
1415 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1416 | return -EINVAL; |
1417 | ||
3bc3fe5e | 1418 | paddc = vmalloc_node(len - size, numa_node_id()); |
1da177e4 LT |
1419 | if (!paddc) |
1420 | return -ENOMEM; | |
1421 | ||
3bc3fe5e | 1422 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1423 | ret = -EFAULT; |
1424 | goto free; | |
1425 | } | |
1426 | ||
336b517f | 1427 | t = xt_find_table_lock(net, AF_INET6, name); |
6b7d31fc HW |
1428 | if (!t || IS_ERR(t)) { |
1429 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1430 | goto free; |
6b7d31fc | 1431 | } |
1da177e4 | 1432 | |
942e4a2b SH |
1433 | |
1434 | local_bh_disable(); | |
2e4e6a17 | 1435 | private = t->private; |
3bc3fe5e | 1436 | if (private->number != num_counters) { |
1da177e4 LT |
1437 | ret = -EINVAL; |
1438 | goto unlock_up_free; | |
1439 | } | |
1440 | ||
1441 | i = 0; | |
31836064 | 1442 | /* Choose the copy that is on our node */ |
942e4a2b SH |
1443 | curcpu = smp_processor_id(); |
1444 | xt_info_wrlock(curcpu); | |
1445 | loc_cpu_entry = private->entries[curcpu]; | |
31836064 | 1446 | IP6T_ENTRY_ITERATE(loc_cpu_entry, |
2e4e6a17 | 1447 | private->size, |
1da177e4 | 1448 | add_counter_to_entry, |
3bc3fe5e | 1449 | paddc, |
1da177e4 | 1450 | &i); |
942e4a2b SH |
1451 | xt_info_wrunlock(curcpu); |
1452 | ||
1da177e4 | 1453 | unlock_up_free: |
942e4a2b | 1454 | local_bh_enable(); |
2e4e6a17 | 1455 | xt_table_unlock(t); |
6b7d31fc | 1456 | module_put(t->me); |
1da177e4 LT |
1457 | free: |
1458 | vfree(paddc); | |
1459 | ||
1460 | return ret; | |
1461 | } | |
1462 | ||
3bc3fe5e PM |
1463 | #ifdef CONFIG_COMPAT |
1464 | struct compat_ip6t_replace { | |
1465 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1466 | u32 valid_hooks; | |
1467 | u32 num_entries; | |
1468 | u32 size; | |
1469 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1470 | u32 underflow[NF_INET_NUMHOOKS]; | |
1471 | u32 num_counters; | |
1472 | compat_uptr_t counters; /* struct ip6t_counters * */ | |
1473 | struct compat_ip6t_entry entries[0]; | |
1474 | }; | |
1475 | ||
1476 | static int | |
1477 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1478 | unsigned int *size, struct xt_counters *counters, |
3bc3fe5e PM |
1479 | unsigned int *i) |
1480 | { | |
1481 | struct ip6t_entry_target *t; | |
1482 | struct compat_ip6t_entry __user *ce; | |
1483 | u_int16_t target_offset, next_offset; | |
1484 | compat_uint_t origsize; | |
1485 | int ret; | |
1486 | ||
1487 | ret = -EFAULT; | |
1488 | origsize = *size; | |
1489 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
1490 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry))) | |
1491 | goto out; | |
1492 | ||
1493 | if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i]))) | |
1494 | goto out; | |
1495 | ||
1496 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1497 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1498 | ||
1499 | ret = IP6T_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size); | |
1500 | target_offset = e->target_offset - (origsize - *size); | |
1501 | if (ret) | |
1502 | goto out; | |
1503 | t = ip6t_get_target(e); | |
1504 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1505 | if (ret) | |
1506 | goto out; | |
1507 | ret = -EFAULT; | |
1508 | next_offset = e->next_offset - (origsize - *size); | |
1509 | if (put_user(target_offset, &ce->target_offset)) | |
1510 | goto out; | |
1511 | if (put_user(next_offset, &ce->next_offset)) | |
1512 | goto out; | |
1513 | ||
1514 | (*i)++; | |
1515 | return 0; | |
1516 | out: | |
1517 | return ret; | |
1518 | } | |
1519 | ||
022748a9 | 1520 | static int |
3bc3fe5e PM |
1521 | compat_find_calc_match(struct ip6t_entry_match *m, |
1522 | const char *name, | |
1523 | const struct ip6t_ip6 *ipv6, | |
1524 | unsigned int hookmask, | |
b0a6363c | 1525 | int *size, unsigned int *i) |
3bc3fe5e PM |
1526 | { |
1527 | struct xt_match *match; | |
1528 | ||
1529 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, | |
1530 | m->u.user.revision), | |
1531 | "ip6t_%s", m->u.user.name); | |
1532 | if (IS_ERR(match) || !match) { | |
1533 | duprintf("compat_check_calc_match: `%s' not found\n", | |
1534 | m->u.user.name); | |
1535 | return match ? PTR_ERR(match) : -ENOENT; | |
1536 | } | |
1537 | m->u.kernel.match = match; | |
1538 | *size += xt_compat_match_offset(match); | |
1539 | ||
1540 | (*i)++; | |
1541 | return 0; | |
1542 | } | |
1543 | ||
022748a9 | 1544 | static int |
3bc3fe5e PM |
1545 | compat_release_match(struct ip6t_entry_match *m, unsigned int *i) |
1546 | { | |
1547 | if (i && (*i)-- == 0) | |
1548 | return 1; | |
1549 | ||
1550 | module_put(m->u.kernel.match->me); | |
1551 | return 0; | |
1552 | } | |
1553 | ||
022748a9 | 1554 | static int |
3bc3fe5e PM |
1555 | compat_release_entry(struct compat_ip6t_entry *e, unsigned int *i) |
1556 | { | |
1557 | struct ip6t_entry_target *t; | |
1558 | ||
1559 | if (i && (*i)-- == 0) | |
1560 | return 1; | |
1561 | ||
1562 | /* Cleanup all matches */ | |
1563 | COMPAT_IP6T_MATCH_ITERATE(e, compat_release_match, NULL); | |
1564 | t = compat_ip6t_get_target(e); | |
1565 | module_put(t->u.kernel.target->me); | |
1566 | return 0; | |
1567 | } | |
1568 | ||
022748a9 | 1569 | static int |
3bc3fe5e PM |
1570 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1571 | struct xt_table_info *newinfo, | |
1572 | unsigned int *size, | |
1573 | unsigned char *base, | |
1574 | unsigned char *limit, | |
1575 | unsigned int *hook_entries, | |
1576 | unsigned int *underflows, | |
1577 | unsigned int *i, | |
1578 | const char *name) | |
1579 | { | |
1580 | struct ip6t_entry_target *t; | |
1581 | struct xt_target *target; | |
1582 | unsigned int entry_offset; | |
b0a6363c PM |
1583 | unsigned int j; |
1584 | int ret, off, h; | |
3bc3fe5e PM |
1585 | |
1586 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1587 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
1588 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
3bc3fe5e PM |
1589 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1590 | return -EINVAL; | |
1591 | } | |
1592 | ||
1593 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1594 | sizeof(struct compat_xt_entry_target)) { | |
1595 | duprintf("checking: element %p size %u\n", | |
1596 | e, e->next_offset); | |
1597 | return -EINVAL; | |
1598 | } | |
1599 | ||
1600 | /* For purposes of check_entry casting the compat entry is fine */ | |
1601 | ret = check_entry((struct ip6t_entry *)e, name); | |
1602 | if (ret) | |
1603 | return ret; | |
1604 | ||
1605 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1606 | entry_offset = (void *)e - (void *)base; | |
1607 | j = 0; | |
1608 | ret = COMPAT_IP6T_MATCH_ITERATE(e, compat_find_calc_match, name, | |
1609 | &e->ipv6, e->comefrom, &off, &j); | |
1610 | if (ret != 0) | |
1611 | goto release_matches; | |
1612 | ||
1613 | t = compat_ip6t_get_target(e); | |
1614 | target = try_then_request_module(xt_find_target(AF_INET6, | |
1615 | t->u.user.name, | |
1616 | t->u.user.revision), | |
1617 | "ip6t_%s", t->u.user.name); | |
1618 | if (IS_ERR(target) || !target) { | |
1619 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", | |
1620 | t->u.user.name); | |
1621 | ret = target ? PTR_ERR(target) : -ENOENT; | |
1622 | goto release_matches; | |
1623 | } | |
1624 | t->u.kernel.target = target; | |
1625 | ||
1626 | off += xt_compat_target_offset(target); | |
1627 | *size += off; | |
1628 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1629 | if (ret) | |
1630 | goto out; | |
1631 | ||
1632 | /* Check hooks & underflows */ | |
1633 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1634 | if ((unsigned char *)e - base == hook_entries[h]) | |
1635 | newinfo->hook_entry[h] = hook_entries[h]; | |
1636 | if ((unsigned char *)e - base == underflows[h]) | |
1637 | newinfo->underflow[h] = underflows[h]; | |
1638 | } | |
1639 | ||
1640 | /* Clear counters and comefrom */ | |
1641 | memset(&e->counters, 0, sizeof(e->counters)); | |
1642 | e->comefrom = 0; | |
1643 | ||
1644 | (*i)++; | |
1645 | return 0; | |
1646 | ||
1647 | out: | |
1648 | module_put(t->u.kernel.target->me); | |
1649 | release_matches: | |
1650 | IP6T_MATCH_ITERATE(e, compat_release_match, &j); | |
1651 | return ret; | |
1652 | } | |
1653 | ||
1654 | static int | |
1655 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1656 | unsigned int *size, const char *name, | |
1657 | struct xt_table_info *newinfo, unsigned char *base) | |
1658 | { | |
1659 | struct ip6t_entry_target *t; | |
1660 | struct xt_target *target; | |
1661 | struct ip6t_entry *de; | |
1662 | unsigned int origsize; | |
1663 | int ret, h; | |
1664 | ||
1665 | ret = 0; | |
1666 | origsize = *size; | |
1667 | de = (struct ip6t_entry *)*dstptr; | |
1668 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1669 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1670 | ||
1671 | *dstptr += sizeof(struct ip6t_entry); | |
1672 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1673 | ||
1674 | ret = COMPAT_IP6T_MATCH_ITERATE(e, xt_compat_match_from_user, | |
1675 | dstptr, size); | |
1676 | if (ret) | |
1677 | return ret; | |
1678 | de->target_offset = e->target_offset - (origsize - *size); | |
1679 | t = compat_ip6t_get_target(e); | |
1680 | target = t->u.kernel.target; | |
1681 | xt_compat_target_from_user(t, dstptr, size); | |
1682 | ||
1683 | de->next_offset = e->next_offset - (origsize - *size); | |
1684 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1685 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1686 | newinfo->hook_entry[h] -= origsize - *size; | |
1687 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1688 | newinfo->underflow[h] -= origsize - *size; | |
1689 | } | |
1690 | return ret; | |
1691 | } | |
1692 | ||
022748a9 | 1693 | static int compat_check_entry(struct ip6t_entry *e, const char *name, |
3bc3fe5e PM |
1694 | unsigned int *i) |
1695 | { | |
b0a6363c PM |
1696 | unsigned int j; |
1697 | int ret; | |
9b4fce7a | 1698 | struct xt_mtchk_param mtpar; |
3bc3fe5e PM |
1699 | |
1700 | j = 0; | |
9b4fce7a JE |
1701 | mtpar.table = name; |
1702 | mtpar.entryinfo = &e->ipv6; | |
1703 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1704 | mtpar.family = NFPROTO_IPV6; |
9b4fce7a | 1705 | ret = IP6T_MATCH_ITERATE(e, check_match, &mtpar, &j); |
3bc3fe5e PM |
1706 | if (ret) |
1707 | goto cleanup_matches; | |
1708 | ||
1709 | ret = check_target(e, name); | |
1710 | if (ret) | |
1711 | goto cleanup_matches; | |
1712 | ||
1713 | (*i)++; | |
1714 | return 0; | |
1715 | ||
1716 | cleanup_matches: | |
1717 | IP6T_MATCH_ITERATE(e, cleanup_match, &j); | |
1718 | return ret; | |
1719 | } | |
1720 | ||
1721 | static int | |
1722 | translate_compat_table(const char *name, | |
1723 | unsigned int valid_hooks, | |
1724 | struct xt_table_info **pinfo, | |
1725 | void **pentry0, | |
1726 | unsigned int total_size, | |
1727 | unsigned int number, | |
1728 | unsigned int *hook_entries, | |
1729 | unsigned int *underflows) | |
1730 | { | |
1731 | unsigned int i, j; | |
1732 | struct xt_table_info *newinfo, *info; | |
1733 | void *pos, *entry0, *entry1; | |
1734 | unsigned int size; | |
1735 | int ret; | |
1736 | ||
1737 | info = *pinfo; | |
1738 | entry0 = *pentry0; | |
1739 | size = total_size; | |
1740 | info->number = number; | |
1741 | ||
1742 | /* Init all hooks to impossible value. */ | |
1743 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1744 | info->hook_entry[i] = 0xFFFFFFFF; | |
1745 | info->underflow[i] = 0xFFFFFFFF; | |
1746 | } | |
1747 | ||
1748 | duprintf("translate_compat_table: size %u\n", info->size); | |
1749 | j = 0; | |
1750 | xt_compat_lock(AF_INET6); | |
1751 | /* Walk through entries, checking offsets. */ | |
1752 | ret = COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size, | |
1753 | check_compat_entry_size_and_hooks, | |
1754 | info, &size, entry0, | |
1755 | entry0 + total_size, | |
1756 | hook_entries, underflows, &j, name); | |
1757 | if (ret != 0) | |
1758 | goto out_unlock; | |
1759 | ||
1760 | ret = -EINVAL; | |
1761 | if (j != number) { | |
1762 | duprintf("translate_compat_table: %u not %u entries\n", | |
1763 | j, number); | |
1764 | goto out_unlock; | |
1765 | } | |
1766 | ||
1767 | /* Check hooks all assigned */ | |
1768 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1769 | /* Only hooks which are valid */ | |
1770 | if (!(valid_hooks & (1 << i))) | |
1771 | continue; | |
1772 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1773 | duprintf("Invalid hook entry %u %u\n", | |
1774 | i, hook_entries[i]); | |
1775 | goto out_unlock; | |
1776 | } | |
1777 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1778 | duprintf("Invalid underflow %u %u\n", | |
1779 | i, underflows[i]); | |
1780 | goto out_unlock; | |
1781 | } | |
1782 | } | |
1783 | ||
1784 | ret = -ENOMEM; | |
1785 | newinfo = xt_alloc_table_info(size); | |
1786 | if (!newinfo) | |
1787 | goto out_unlock; | |
1788 | ||
1789 | newinfo->number = number; | |
1790 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1791 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1792 | newinfo->underflow[i] = info->underflow[i]; | |
1793 | } | |
1794 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1795 | pos = entry1; | |
1796 | size = total_size; | |
1797 | ret = COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size, | |
1798 | compat_copy_entry_from_user, | |
1799 | &pos, &size, name, newinfo, entry1); | |
1800 | xt_compat_flush_offsets(AF_INET6); | |
1801 | xt_compat_unlock(AF_INET6); | |
1802 | if (ret) | |
1803 | goto free_newinfo; | |
1804 | ||
1805 | ret = -ELOOP; | |
1806 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1807 | goto free_newinfo; | |
1808 | ||
1809 | i = 0; | |
1810 | ret = IP6T_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry, | |
1811 | name, &i); | |
1812 | if (ret) { | |
1813 | j -= i; | |
1814 | COMPAT_IP6T_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i, | |
1815 | compat_release_entry, &j); | |
1816 | IP6T_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i); | |
1817 | xt_free_table_info(newinfo); | |
1818 | return ret; | |
1819 | } | |
1820 | ||
1821 | /* And one copy for every other CPU */ | |
1822 | for_each_possible_cpu(i) | |
1823 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1824 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1825 | ||
1826 | *pinfo = newinfo; | |
1827 | *pentry0 = entry1; | |
1828 | xt_free_table_info(info); | |
1829 | return 0; | |
1830 | ||
1831 | free_newinfo: | |
1832 | xt_free_table_info(newinfo); | |
1833 | out: | |
1834 | COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j); | |
1835 | return ret; | |
1836 | out_unlock: | |
1837 | xt_compat_flush_offsets(AF_INET6); | |
1838 | xt_compat_unlock(AF_INET6); | |
1839 | goto out; | |
1840 | } | |
1841 | ||
1842 | static int | |
336b517f | 1843 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1844 | { |
1845 | int ret; | |
1846 | struct compat_ip6t_replace tmp; | |
1847 | struct xt_table_info *newinfo; | |
1848 | void *loc_cpu_entry; | |
1849 | ||
1850 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1851 | return -EFAULT; | |
1852 | ||
1853 | /* overflow check */ | |
1854 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1855 | return -ENOMEM; | |
1856 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1857 | return -ENOMEM; | |
1858 | ||
1859 | newinfo = xt_alloc_table_info(tmp.size); | |
1860 | if (!newinfo) | |
1861 | return -ENOMEM; | |
1862 | ||
9c547959 | 1863 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1864 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1865 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1866 | tmp.size) != 0) { | |
1867 | ret = -EFAULT; | |
1868 | goto free_newinfo; | |
1869 | } | |
1870 | ||
1871 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, | |
1872 | &newinfo, &loc_cpu_entry, tmp.size, | |
1873 | tmp.num_entries, tmp.hook_entry, | |
1874 | tmp.underflow); | |
1875 | if (ret != 0) | |
1876 | goto free_newinfo; | |
1877 | ||
1878 | duprintf("compat_do_replace: Translated table\n"); | |
1879 | ||
336b517f | 1880 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1881 | tmp.num_counters, compat_ptr(tmp.counters)); |
1882 | if (ret) | |
1883 | goto free_newinfo_untrans; | |
1884 | return 0; | |
1885 | ||
1886 | free_newinfo_untrans: | |
1887 | IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); | |
1888 | free_newinfo: | |
1889 | xt_free_table_info(newinfo); | |
1890 | return ret; | |
1891 | } | |
1892 | ||
1893 | static int | |
1894 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1895 | unsigned int len) | |
1896 | { | |
1897 | int ret; | |
1898 | ||
1899 | if (!capable(CAP_NET_ADMIN)) | |
1900 | return -EPERM; | |
1901 | ||
1902 | switch (cmd) { | |
1903 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1904 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1905 | break; |
1906 | ||
1907 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1908 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1909 | break; |
1910 | ||
1911 | default: | |
1912 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1913 | ret = -EINVAL; | |
1914 | } | |
1915 | ||
1916 | return ret; | |
1917 | } | |
1918 | ||
1919 | struct compat_ip6t_get_entries { | |
1920 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1921 | compat_uint_t size; | |
1922 | struct compat_ip6t_entry entrytable[0]; | |
1923 | }; | |
1924 | ||
1925 | static int | |
1926 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1927 | void __user *userptr) | |
1928 | { | |
1929 | struct xt_counters *counters; | |
5452e425 | 1930 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1931 | void __user *pos; |
1932 | unsigned int size; | |
1933 | int ret = 0; | |
5452e425 | 1934 | const void *loc_cpu_entry; |
3bc3fe5e PM |
1935 | unsigned int i = 0; |
1936 | ||
1937 | counters = alloc_counters(table); | |
1938 | if (IS_ERR(counters)) | |
1939 | return PTR_ERR(counters); | |
1940 | ||
1941 | /* choose the copy that is on our node/cpu, ... | |
1942 | * This choice is lazy (because current thread is | |
1943 | * allowed to migrate to another cpu) | |
1944 | */ | |
1945 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1946 | pos = userptr; | |
1947 | size = total_size; | |
1948 | ret = IP6T_ENTRY_ITERATE(loc_cpu_entry, total_size, | |
1949 | compat_copy_entry_to_user, | |
1950 | &pos, &size, counters, &i); | |
1951 | ||
1952 | vfree(counters); | |
1953 | return ret; | |
1954 | } | |
1955 | ||
1956 | static int | |
336b517f AD |
1957 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1958 | int *len) | |
3bc3fe5e PM |
1959 | { |
1960 | int ret; | |
1961 | struct compat_ip6t_get_entries get; | |
1962 | struct xt_table *t; | |
1963 | ||
1964 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1965 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1966 | return -EINVAL; |
1967 | } | |
1968 | ||
1969 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1970 | return -EFAULT; | |
1971 | ||
1972 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1973 | duprintf("compat_get_entries: %u != %zu\n", |
1974 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1975 | return -EINVAL; |
1976 | } | |
1977 | ||
1978 | xt_compat_lock(AF_INET6); | |
336b517f | 1979 | t = xt_find_table_lock(net, AF_INET6, get.name); |
3bc3fe5e | 1980 | if (t && !IS_ERR(t)) { |
5452e425 | 1981 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1982 | struct xt_table_info info; |
9c547959 | 1983 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1984 | ret = compat_table_info(private, &info); |
1985 | if (!ret && get.size == info.size) { | |
1986 | ret = compat_copy_entries_to_user(private->size, | |
1987 | t, uptr->entrytable); | |
1988 | } else if (!ret) { | |
1989 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1990 | private->size, get.size); |
544473c1 | 1991 | ret = -EAGAIN; |
3bc3fe5e PM |
1992 | } |
1993 | xt_compat_flush_offsets(AF_INET6); | |
1994 | module_put(t->me); | |
1995 | xt_table_unlock(t); | |
1996 | } else | |
1997 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1998 | ||
1999 | xt_compat_unlock(AF_INET6); | |
2000 | return ret; | |
2001 | } | |
2002 | ||
2003 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
2004 | ||
2005 | static int | |
2006 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2007 | { | |
2008 | int ret; | |
2009 | ||
2010 | if (!capable(CAP_NET_ADMIN)) | |
2011 | return -EPERM; | |
2012 | ||
2013 | switch (cmd) { | |
2014 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 2015 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
2016 | break; |
2017 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 2018 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
2019 | break; |
2020 | default: | |
2021 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
2022 | } | |
2023 | return ret; | |
2024 | } | |
2025 | #endif | |
2026 | ||
1da177e4 LT |
2027 | static int |
2028 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2029 | { | |
2030 | int ret; | |
2031 | ||
2032 | if (!capable(CAP_NET_ADMIN)) | |
2033 | return -EPERM; | |
2034 | ||
2035 | switch (cmd) { | |
2036 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2037 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2038 | break; |
2039 | ||
2040 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2041 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2042 | break; |
2043 | ||
2044 | default: | |
2045 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2046 | ret = -EINVAL; | |
2047 | } | |
2048 | ||
2049 | return ret; | |
2050 | } | |
2051 | ||
2052 | static int | |
2053 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2054 | { | |
2055 | int ret; | |
2056 | ||
2057 | if (!capable(CAP_NET_ADMIN)) | |
2058 | return -EPERM; | |
2059 | ||
2060 | switch (cmd) { | |
433665c9 | 2061 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2062 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2063 | break; |
1da177e4 | 2064 | |
d924357c | 2065 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2066 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2067 | break; |
1da177e4 | 2068 | |
6b7d31fc HW |
2069 | case IP6T_SO_GET_REVISION_MATCH: |
2070 | case IP6T_SO_GET_REVISION_TARGET: { | |
2071 | struct ip6t_get_revision rev; | |
2e4e6a17 | 2072 | int target; |
6b7d31fc HW |
2073 | |
2074 | if (*len != sizeof(rev)) { | |
2075 | ret = -EINVAL; | |
2076 | break; | |
2077 | } | |
2078 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2079 | ret = -EFAULT; | |
2080 | break; | |
2081 | } | |
2082 | ||
2083 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2084 | target = 1; |
6b7d31fc | 2085 | else |
2e4e6a17 | 2086 | target = 0; |
6b7d31fc | 2087 | |
2e4e6a17 HW |
2088 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2089 | rev.revision, | |
2090 | target, &ret), | |
6b7d31fc HW |
2091 | "ip6t_%s", rev.name); |
2092 | break; | |
2093 | } | |
2094 | ||
1da177e4 LT |
2095 | default: |
2096 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2097 | ret = -EINVAL; | |
2098 | } | |
2099 | ||
2100 | return ret; | |
2101 | } | |
2102 | ||
35aad0ff JE |
2103 | struct xt_table *ip6t_register_table(struct net *net, |
2104 | const struct xt_table *table, | |
336b517f | 2105 | const struct ip6t_replace *repl) |
1da177e4 LT |
2106 | { |
2107 | int ret; | |
2e4e6a17 | 2108 | struct xt_table_info *newinfo; |
259d4e41 | 2109 | struct xt_table_info bootstrap |
1da177e4 | 2110 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2111 | void *loc_cpu_entry; |
a98da11d | 2112 | struct xt_table *new_table; |
1da177e4 | 2113 | |
2e4e6a17 | 2114 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2115 | if (!newinfo) { |
2116 | ret = -ENOMEM; | |
2117 | goto out; | |
2118 | } | |
1da177e4 | 2119 | |
9c547959 | 2120 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2121 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2122 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
2123 | |
2124 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 2125 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
2126 | repl->num_entries, |
2127 | repl->hook_entry, | |
2128 | repl->underflow); | |
44d34e72 AD |
2129 | if (ret != 0) |
2130 | goto out_free; | |
1da177e4 | 2131 | |
336b517f | 2132 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2133 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2134 | ret = PTR_ERR(new_table); |
2135 | goto out_free; | |
1da177e4 | 2136 | } |
44d34e72 | 2137 | return new_table; |
1da177e4 | 2138 | |
44d34e72 AD |
2139 | out_free: |
2140 | xt_free_table_info(newinfo); | |
2141 | out: | |
2142 | return ERR_PTR(ret); | |
1da177e4 LT |
2143 | } |
2144 | ||
2e4e6a17 | 2145 | void ip6t_unregister_table(struct xt_table *table) |
1da177e4 | 2146 | { |
2e4e6a17 | 2147 | struct xt_table_info *private; |
31836064 | 2148 | void *loc_cpu_entry; |
df200969 | 2149 | struct module *table_owner = table->me; |
31836064 | 2150 | |
2e4e6a17 | 2151 | private = xt_unregister_table(table); |
1da177e4 LT |
2152 | |
2153 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
2154 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
2155 | IP6T_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
df200969 AD |
2156 | if (private->number > private->initial_entries) |
2157 | module_put(table_owner); | |
2e4e6a17 | 2158 | xt_free_table_info(private); |
1da177e4 LT |
2159 | } |
2160 | ||
2161 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2162 | static inline bool |
1da177e4 LT |
2163 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2164 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2165 | bool invert) |
1da177e4 LT |
2166 | { |
2167 | return (type == test_type && code >= min_code && code <= max_code) | |
2168 | ^ invert; | |
2169 | } | |
2170 | ||
1d93a9cb | 2171 | static bool |
f7108a20 | 2172 | icmp6_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2173 | { |
5452e425 JE |
2174 | const struct icmp6hdr *ic; |
2175 | struct icmp6hdr _icmph; | |
f7108a20 | 2176 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2177 | |
2178 | /* Must not be a fragment. */ | |
f7108a20 | 2179 | if (par->fragoff != 0) |
1d93a9cb | 2180 | return false; |
1da177e4 | 2181 | |
f7108a20 | 2182 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2183 | if (ic == NULL) { |
2184 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2185 | * can't. Hence, no choice but to drop. |
2186 | */ | |
1da177e4 | 2187 | duprintf("Dropping evil ICMP tinygram.\n"); |
f7108a20 | 2188 | *par->hotdrop = true; |
1d93a9cb | 2189 | return false; |
1da177e4 LT |
2190 | } |
2191 | ||
2192 | return icmp6_type_code_match(icmpinfo->type, | |
2193 | icmpinfo->code[0], | |
2194 | icmpinfo->code[1], | |
2195 | ic->icmp6_type, ic->icmp6_code, | |
2196 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2197 | } | |
2198 | ||
2199 | /* Called when user tries to insert an entry of this type. */ | |
9b4fce7a | 2200 | static bool icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2201 | { |
9b4fce7a | 2202 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2203 | |
7f939713 PM |
2204 | /* Must specify no unknown invflags */ |
2205 | return !(icmpinfo->invflags & ~IP6T_ICMP_INV); | |
1da177e4 LT |
2206 | } |
2207 | ||
2208 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2209 | static struct xt_target ip6t_standard_target __read_mostly = { |
1da177e4 | 2210 | .name = IP6T_STANDARD_TARGET, |
7f939713 | 2211 | .targetsize = sizeof(int), |
4ba351cf | 2212 | .family = NFPROTO_IPV6, |
3bc3fe5e PM |
2213 | #ifdef CONFIG_COMPAT |
2214 | .compatsize = sizeof(compat_int_t), | |
2215 | .compat_from_user = compat_standard_from_user, | |
2216 | .compat_to_user = compat_standard_to_user, | |
2217 | #endif | |
1da177e4 LT |
2218 | }; |
2219 | ||
9f15c530 | 2220 | static struct xt_target ip6t_error_target __read_mostly = { |
1da177e4 LT |
2221 | .name = IP6T_ERROR_TARGET, |
2222 | .target = ip6t_error, | |
7f939713 | 2223 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, |
4ba351cf | 2224 | .family = NFPROTO_IPV6, |
1da177e4 LT |
2225 | }; |
2226 | ||
2227 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2228 | .pf = PF_INET6, | |
2229 | .set_optmin = IP6T_BASE_CTL, | |
2230 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2231 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2232 | #ifdef CONFIG_COMPAT |
2233 | .compat_set = compat_do_ip6t_set_ctl, | |
2234 | #endif | |
1da177e4 LT |
2235 | .get_optmin = IP6T_BASE_CTL, |
2236 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2237 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2238 | #ifdef CONFIG_COMPAT |
2239 | .compat_get = compat_do_ip6t_get_ctl, | |
2240 | #endif | |
16fcec35 | 2241 | .owner = THIS_MODULE, |
1da177e4 LT |
2242 | }; |
2243 | ||
9f15c530 | 2244 | static struct xt_match icmp6_matchstruct __read_mostly = { |
1da177e4 | 2245 | .name = "icmp6", |
9c547959 | 2246 | .match = icmp6_match, |
7f939713 PM |
2247 | .matchsize = sizeof(struct ip6t_icmp), |
2248 | .checkentry = icmp6_checkentry, | |
2249 | .proto = IPPROTO_ICMPV6, | |
4ba351cf | 2250 | .family = NFPROTO_IPV6, |
1da177e4 LT |
2251 | }; |
2252 | ||
3cb609d5 AD |
2253 | static int __net_init ip6_tables_net_init(struct net *net) |
2254 | { | |
383ca5b8 | 2255 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2256 | } |
2257 | ||
2258 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2259 | { | |
383ca5b8 | 2260 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2261 | } |
2262 | ||
2263 | static struct pernet_operations ip6_tables_net_ops = { | |
2264 | .init = ip6_tables_net_init, | |
2265 | .exit = ip6_tables_net_exit, | |
2266 | }; | |
2267 | ||
65b4b4e8 | 2268 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2269 | { |
2270 | int ret; | |
2271 | ||
3cb609d5 | 2272 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2273 | if (ret < 0) |
2274 | goto err1; | |
2e4e6a17 | 2275 | |
1da177e4 | 2276 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2277 | ret = xt_register_target(&ip6t_standard_target); |
2278 | if (ret < 0) | |
2279 | goto err2; | |
2280 | ret = xt_register_target(&ip6t_error_target); | |
2281 | if (ret < 0) | |
2282 | goto err3; | |
2283 | ret = xt_register_match(&icmp6_matchstruct); | |
2284 | if (ret < 0) | |
2285 | goto err4; | |
1da177e4 LT |
2286 | |
2287 | /* Register setsockopt */ | |
2288 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2289 | if (ret < 0) |
2290 | goto err5; | |
1da177e4 | 2291 | |
a887c1c1 | 2292 | printk(KERN_INFO "ip6_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2293 | return 0; |
0eff66e6 PM |
2294 | |
2295 | err5: | |
2296 | xt_unregister_match(&icmp6_matchstruct); | |
2297 | err4: | |
2298 | xt_unregister_target(&ip6t_error_target); | |
2299 | err3: | |
2300 | xt_unregister_target(&ip6t_standard_target); | |
2301 | err2: | |
3cb609d5 | 2302 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2303 | err1: |
2304 | return ret; | |
1da177e4 LT |
2305 | } |
2306 | ||
65b4b4e8 | 2307 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2308 | { |
2309 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2310 | |
a45049c5 PNA |
2311 | xt_unregister_match(&icmp6_matchstruct); |
2312 | xt_unregister_target(&ip6t_error_target); | |
2313 | xt_unregister_target(&ip6t_standard_target); | |
3cb609d5 AD |
2314 | |
2315 | unregister_pernet_subsys(&ip6_tables_net_ops); | |
1da177e4 LT |
2316 | } |
2317 | ||
e674d0f3 | 2318 | /* |
b777e0ce PM |
2319 | * find the offset to specified header or the protocol number of last header |
2320 | * if target < 0. "last header" is transport protocol header, ESP, or | |
2321 | * "No next header". | |
2322 | * | |
2323 | * If target header is found, its offset is set in *offset and return protocol | |
2324 | * number. Otherwise, return -1. | |
2325 | * | |
6d381634 PM |
2326 | * If the first fragment doesn't contain the final protocol header or |
2327 | * NEXTHDR_NONE it is considered invalid. | |
2328 | * | |
b777e0ce PM |
2329 | * Note that non-1st fragment is special case that "the protocol number |
2330 | * of last header" is "next header" field in Fragment header. In this case, | |
2331 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
2332 | * isn't NULL. | |
e674d0f3 | 2333 | * |
e674d0f3 | 2334 | */ |
b777e0ce PM |
2335 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
2336 | int target, unsigned short *fragoff) | |
e674d0f3 | 2337 | { |
6b88dd96 | 2338 | unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); |
0660e03f | 2339 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
e674d0f3 YK |
2340 | unsigned int len = skb->len - start; |
2341 | ||
b777e0ce PM |
2342 | if (fragoff) |
2343 | *fragoff = 0; | |
2344 | ||
e674d0f3 YK |
2345 | while (nexthdr != target) { |
2346 | struct ipv6_opt_hdr _hdr, *hp; | |
2347 | unsigned int hdrlen; | |
2348 | ||
b777e0ce PM |
2349 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
2350 | if (target < 0) | |
2351 | break; | |
6d381634 | 2352 | return -ENOENT; |
b777e0ce PM |
2353 | } |
2354 | ||
e674d0f3 YK |
2355 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
2356 | if (hp == NULL) | |
6d381634 | 2357 | return -EBADMSG; |
e674d0f3 | 2358 | if (nexthdr == NEXTHDR_FRAGMENT) { |
e69a4adc AV |
2359 | unsigned short _frag_off; |
2360 | __be16 *fp; | |
e674d0f3 YK |
2361 | fp = skb_header_pointer(skb, |
2362 | start+offsetof(struct frag_hdr, | |
2363 | frag_off), | |
2364 | sizeof(_frag_off), | |
2365 | &_frag_off); | |
2366 | if (fp == NULL) | |
6d381634 | 2367 | return -EBADMSG; |
e674d0f3 | 2368 | |
b777e0ce PM |
2369 | _frag_off = ntohs(*fp) & ~0x7; |
2370 | if (_frag_off) { | |
2371 | if (target < 0 && | |
2372 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
337dde79 | 2373 | hp->nexthdr == NEXTHDR_NONE)) { |
b777e0ce PM |
2374 | if (fragoff) |
2375 | *fragoff = _frag_off; | |
2376 | return hp->nexthdr; | |
2377 | } | |
6d381634 | 2378 | return -ENOENT; |
b777e0ce | 2379 | } |
e674d0f3 YK |
2380 | hdrlen = 8; |
2381 | } else if (nexthdr == NEXTHDR_AUTH) | |
1ab1457c | 2382 | hdrlen = (hp->hdrlen + 2) << 2; |
e674d0f3 | 2383 | else |
1ab1457c | 2384 | hdrlen = ipv6_optlen(hp); |
e674d0f3 YK |
2385 | |
2386 | nexthdr = hp->nexthdr; | |
2387 | len -= hdrlen; | |
2388 | start += hdrlen; | |
2389 | } | |
2390 | ||
2391 | *offset = start; | |
b777e0ce | 2392 | return nexthdr; |
e674d0f3 YK |
2393 | } |
2394 | ||
1da177e4 LT |
2395 | EXPORT_SYMBOL(ip6t_register_table); |
2396 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2397 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2398 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 2399 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 2400 | |
65b4b4e8 AM |
2401 | module_init(ip6_tables_init); |
2402 | module_exit(ip6_tables_fini); |