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> |
f229f6ce | 6 | * Copyright (c) 2006-2010 Patrick McHardy <kaber@trash.net> |
1da177e4 LT |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
1da177e4 | 11 | */ |
90e7d4ab | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
4fc268d2 | 13 | #include <linux/capability.h> |
14c85021 | 14 | #include <linux/in.h> |
1da177e4 LT |
15 | #include <linux/skbuff.h> |
16 | #include <linux/kmod.h> | |
17 | #include <linux/vmalloc.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/module.h> | |
4bdbf6c0 | 20 | #include <linux/poison.h> |
1da177e4 | 21 | #include <linux/icmpv6.h> |
1da177e4 | 22 | #include <net/ipv6.h> |
3bc3fe5e | 23 | #include <net/compat.h> |
1da177e4 | 24 | #include <asm/uaccess.h> |
57b47a53 | 25 | #include <linux/mutex.h> |
1da177e4 | 26 | #include <linux/proc_fs.h> |
3bc3fe5e | 27 | #include <linux/err.h> |
c8923c6b | 28 | #include <linux/cpumask.h> |
1da177e4 LT |
29 | |
30 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
2e4e6a17 | 31 | #include <linux/netfilter/x_tables.h> |
f01ffbd6 | 32 | #include <net/netfilter/nf_log.h> |
e3eaa991 | 33 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
34 | |
35 | MODULE_LICENSE("GPL"); | |
36 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
37 | MODULE_DESCRIPTION("IPv6 packet filter"); | |
38 | ||
1da177e4 LT |
39 | /*#define DEBUG_IP_FIREWALL*/ |
40 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
41 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
42 | ||
43 | #ifdef DEBUG_IP_FIREWALL | |
ff67e4e4 | 44 | #define dprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
45 | #else |
46 | #define dprintf(format, args...) | |
47 | #endif | |
48 | ||
49 | #ifdef DEBUG_IP_FIREWALL_USER | |
ff67e4e4 | 50 | #define duprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
51 | #else |
52 | #define duprintf(format, args...) | |
53 | #endif | |
54 | ||
55 | #ifdef CONFIG_NETFILTER_DEBUG | |
af567603 | 56 | #define IP_NF_ASSERT(x) WARN_ON(!(x)) |
1da177e4 LT |
57 | #else |
58 | #define IP_NF_ASSERT(x) | |
59 | #endif | |
1da177e4 | 60 | |
1da177e4 LT |
61 | #if 0 |
62 | /* All the better to debug you with... */ | |
63 | #define static | |
64 | #define inline | |
65 | #endif | |
66 | ||
e3eaa991 JE |
67 | void *ip6t_alloc_initial_table(const struct xt_table *info) |
68 | { | |
69 | return xt_alloc_initial_table(ip6t, IP6T); | |
70 | } | |
71 | EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table); | |
72 | ||
6b7d31fc | 73 | /* |
1da177e4 | 74 | We keep a set of rules for each CPU, so we can avoid write-locking |
6b7d31fc HW |
75 | them in the softirq when updating the counters and therefore |
76 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
77 | context stops packets coming through and allows user context to read | |
78 | the counters or update the rules. | |
1da177e4 | 79 | |
1da177e4 LT |
80 | Hence the start of any table is given by get_table() below. */ |
81 | ||
1da177e4 | 82 | /* Returns whether matches rule or not. */ |
022748a9 | 83 | /* Performance critical - called for every packet */ |
1d93a9cb | 84 | static inline bool |
1da177e4 LT |
85 | ip6_packet_match(const struct sk_buff *skb, |
86 | const char *indev, | |
87 | const char *outdev, | |
88 | const struct ip6t_ip6 *ip6info, | |
89 | unsigned int *protoff, | |
cff533ac | 90 | int *fragoff, bool *hotdrop) |
1da177e4 | 91 | { |
1da177e4 | 92 | unsigned long ret; |
0660e03f | 93 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
1da177e4 | 94 | |
e79ec50b | 95 | #define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg))) |
1da177e4 | 96 | |
f2ffd9ee | 97 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
3666ed1c JP |
98 | &ip6info->src), IP6T_INV_SRCIP) || |
99 | FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, | |
100 | &ip6info->dst), IP6T_INV_DSTIP)) { | |
1da177e4 LT |
101 | dprintf("Source or dest mismatch.\n"); |
102 | /* | |
103 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, | |
104 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, | |
105 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); | |
106 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, | |
107 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, | |
108 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ | |
1d93a9cb | 109 | return false; |
1da177e4 LT |
110 | } |
111 | ||
b8dfe498 | 112 | ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask); |
1da177e4 LT |
113 | |
114 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { | |
115 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
116 | indev, ip6info->iniface, | |
117 | ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":""); | |
1d93a9cb | 118 | return false; |
1da177e4 LT |
119 | } |
120 | ||
b8dfe498 | 121 | ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask); |
1da177e4 LT |
122 | |
123 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { | |
124 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
125 | outdev, ip6info->outiface, | |
126 | ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":""); | |
1d93a9cb | 127 | return false; |
1da177e4 LT |
128 | } |
129 | ||
130 | /* ... might want to do something with class and flowlabel here ... */ | |
131 | ||
132 | /* look for the desired protocol header */ | |
133 | if((ip6info->flags & IP6T_F_PROTO)) { | |
b777e0ce PM |
134 | int protohdr; |
135 | unsigned short _frag_off; | |
1da177e4 | 136 | |
84018f55 | 137 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off, NULL); |
51d8b1a6 PM |
138 | if (protohdr < 0) { |
139 | if (_frag_off == 0) | |
cff533ac | 140 | *hotdrop = true; |
1d93a9cb | 141 | return false; |
51d8b1a6 | 142 | } |
b777e0ce | 143 | *fragoff = _frag_off; |
1da177e4 LT |
144 | |
145 | dprintf("Packet protocol %hi ?= %s%hi.\n", | |
1ab1457c | 146 | protohdr, |
1da177e4 LT |
147 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
148 | ip6info->proto); | |
149 | ||
b777e0ce | 150 | if (ip6info->proto == protohdr) { |
1da177e4 | 151 | if(ip6info->invflags & IP6T_INV_PROTO) { |
1d93a9cb | 152 | return false; |
1da177e4 | 153 | } |
1d93a9cb | 154 | return true; |
1da177e4 LT |
155 | } |
156 | ||
157 | /* We need match for the '-p all', too! */ | |
158 | if ((ip6info->proto != 0) && | |
159 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
1d93a9cb | 160 | return false; |
1da177e4 | 161 | } |
1d93a9cb | 162 | return true; |
1da177e4 LT |
163 | } |
164 | ||
165 | /* should be ip6 safe */ | |
022748a9 | 166 | static bool |
1da177e4 LT |
167 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
168 | { | |
169 | if (ipv6->flags & ~IP6T_F_MASK) { | |
170 | duprintf("Unknown flag bits set: %08X\n", | |
171 | ipv6->flags & ~IP6T_F_MASK); | |
ccb79bdc | 172 | return false; |
1da177e4 LT |
173 | } |
174 | if (ipv6->invflags & ~IP6T_INV_MASK) { | |
175 | duprintf("Unknown invflag bits set: %08X\n", | |
176 | ipv6->invflags & ~IP6T_INV_MASK); | |
ccb79bdc | 177 | return false; |
1da177e4 | 178 | } |
ccb79bdc | 179 | return true; |
1da177e4 LT |
180 | } |
181 | ||
182 | static unsigned int | |
4b560b44 | 183 | ip6t_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 184 | { |
e87cc472 | 185 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
186 | |
187 | return NF_DROP; | |
188 | } | |
189 | ||
1da177e4 | 190 | static inline struct ip6t_entry * |
d5d1baa1 | 191 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
192 | { |
193 | return (struct ip6t_entry *)(base + offset); | |
194 | } | |
195 | ||
ba9dda3a | 196 | /* All zeroes == unconditional rule. */ |
022748a9 | 197 | /* Mildly perf critical (only if packet tracing is on) */ |
47901dc2 | 198 | static inline bool unconditional(const struct ip6t_ip6 *ipv6) |
ba9dda3a | 199 | { |
47901dc2 | 200 | static const struct ip6t_ip6 uncond; |
ba9dda3a | 201 | |
47901dc2 | 202 | return memcmp(ipv6, &uncond, sizeof(uncond)) == 0; |
ba9dda3a JK |
203 | } |
204 | ||
87a2e70d | 205 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
206 | ip6t_get_target_c(const struct ip6t_entry *e) |
207 | { | |
208 | return ip6t_get_target((struct ip6t_entry *)e); | |
209 | } | |
210 | ||
07a93626 | 211 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
ba9dda3a | 212 | /* This cries for unification! */ |
022748a9 | 213 | static const char *const hooknames[] = { |
6e23ae2a PM |
214 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
215 | [NF_INET_LOCAL_IN] = "INPUT", | |
216 | [NF_INET_FORWARD] = "FORWARD", | |
217 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
218 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
219 | }; |
220 | ||
221 | enum nf_ip_trace_comments { | |
222 | NF_IP6_TRACE_COMMENT_RULE, | |
223 | NF_IP6_TRACE_COMMENT_RETURN, | |
224 | NF_IP6_TRACE_COMMENT_POLICY, | |
225 | }; | |
226 | ||
022748a9 | 227 | static const char *const comments[] = { |
ba9dda3a JK |
228 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
229 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
230 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
231 | }; | |
232 | ||
233 | static struct nf_loginfo trace_loginfo = { | |
234 | .type = NF_LOG_TYPE_LOG, | |
235 | .u = { | |
236 | .log = { | |
237 | .level = 4, | |
238 | .logflags = NF_LOG_MASK, | |
239 | }, | |
240 | }, | |
241 | }; | |
242 | ||
022748a9 | 243 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 244 | static inline int |
d5d1baa1 | 245 | get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e, |
4f2f6f23 JE |
246 | const char *hookname, const char **chainname, |
247 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 248 | { |
87a2e70d | 249 | const struct xt_standard_target *t = (void *)ip6t_get_target_c(s); |
ba9dda3a | 250 | |
243bf6e2 | 251 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
252 | /* Head of user chain: ERROR target with chainname */ |
253 | *chainname = t->target.data; | |
254 | (*rulenum) = 0; | |
255 | } else if (s == e) { | |
256 | (*rulenum)++; | |
257 | ||
3666ed1c JP |
258 | if (s->target_offset == sizeof(struct ip6t_entry) && |
259 | strcmp(t->target.u.kernel.target->name, | |
243bf6e2 | 260 | XT_STANDARD_TARGET) == 0 && |
3666ed1c JP |
261 | t->verdict < 0 && |
262 | unconditional(&s->ipv6)) { | |
ba9dda3a JK |
263 | /* Tail of chains: STANDARD target (return/policy) */ |
264 | *comment = *chainname == hookname | |
4f2f6f23 JE |
265 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
266 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
267 | } |
268 | return 1; | |
269 | } else | |
270 | (*rulenum)++; | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
d5d1baa1 | 275 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
276 | unsigned int hook, |
277 | const struct net_device *in, | |
278 | const struct net_device *out, | |
ecb6f85e | 279 | const char *tablename, |
d5d1baa1 JE |
280 | const struct xt_table_info *private, |
281 | const struct ip6t_entry *e) | |
ba9dda3a | 282 | { |
d5d1baa1 | 283 | const void *table_base; |
5452e425 | 284 | const struct ip6t_entry *root; |
4f2f6f23 | 285 | const char *hookname, *chainname, *comment; |
72b2b1dd | 286 | const struct ip6t_entry *iter; |
ba9dda3a | 287 | unsigned int rulenum = 0; |
30e0c6a6 | 288 | struct net *net = dev_net(in ? in : out); |
ba9dda3a | 289 | |
ccf5bd8c | 290 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
291 | root = get_entry(table_base, private->hook_entry[hook]); |
292 | ||
4f2f6f23 JE |
293 | hookname = chainname = hooknames[hook]; |
294 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; | |
ba9dda3a | 295 | |
72b2b1dd JE |
296 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
297 | if (get_chainname_rulenum(iter, e, hookname, | |
298 | &chainname, &comment, &rulenum) != 0) | |
299 | break; | |
ba9dda3a | 300 | |
30e0c6a6 | 301 | nf_log_packet(net, AF_INET6, hook, skb, in, out, &trace_loginfo, |
ba9dda3a JK |
302 | "TRACE: %s:%s:%s:%u ", |
303 | tablename, chainname, comment, rulenum); | |
304 | } | |
305 | #endif | |
306 | ||
98e86403 JE |
307 | static inline __pure struct ip6t_entry * |
308 | ip6t_next_entry(const struct ip6t_entry *entry) | |
309 | { | |
310 | return (void *)entry + entry->next_offset; | |
311 | } | |
312 | ||
1da177e4 LT |
313 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
314 | unsigned int | |
3db05fea | 315 | ip6t_do_table(struct sk_buff *skb, |
1da177e4 LT |
316 | unsigned int hook, |
317 | const struct net_device *in, | |
318 | const struct net_device *out, | |
fe1cb108 | 319 | struct xt_table *table) |
1da177e4 | 320 | { |
6b7d31fc | 321 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
322 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
323 | unsigned int verdict = NF_DROP; | |
324 | const char *indev, *outdev; | |
d5d1baa1 | 325 | const void *table_base; |
f3c5c1bf JE |
326 | struct ip6t_entry *e, **jumpstack; |
327 | unsigned int *stackptr, origptr, cpu; | |
d5d1baa1 | 328 | const struct xt_table_info *private; |
de74c169 | 329 | struct xt_action_param acpar; |
7f5c6d4f | 330 | unsigned int addend; |
1da177e4 LT |
331 | |
332 | /* Initialization */ | |
333 | indev = in ? in->name : nulldevname; | |
334 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
335 | /* We handle fragments by dealing with the first fragment as |
336 | * if it was a normal packet. All other fragments are treated | |
337 | * normally, except that they will NEVER match rules that ask | |
338 | * things we don't know, ie. tcp syn flag or ports). If the | |
339 | * rule is also a fragment-specific rule, non-fragments won't | |
340 | * match it. */ | |
b4ba2611 | 341 | acpar.hotdrop = false; |
de74c169 JE |
342 | acpar.in = in; |
343 | acpar.out = out; | |
344 | acpar.family = NFPROTO_IPV6; | |
345 | acpar.hooknum = hook; | |
1da177e4 | 346 | |
1da177e4 | 347 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
78454473 | 348 | |
7f5c6d4f ED |
349 | local_bh_disable(); |
350 | addend = xt_write_recseq_begin(); | |
942e4a2b | 351 | private = table->private; |
b416c144 WD |
352 | /* |
353 | * Ensure we load private-> members after we've fetched the base | |
354 | * pointer. | |
355 | */ | |
356 | smp_read_barrier_depends(); | |
f3c5c1bf JE |
357 | cpu = smp_processor_id(); |
358 | table_base = private->entries[cpu]; | |
359 | jumpstack = (struct ip6t_entry **)private->jumpstack[cpu]; | |
7489aec8 | 360 | stackptr = per_cpu_ptr(private->stackptr, cpu); |
f3c5c1bf | 361 | origptr = *stackptr; |
78454473 | 362 | |
2e4e6a17 | 363 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 364 | |
1da177e4 | 365 | do { |
87a2e70d | 366 | const struct xt_entry_target *t; |
dcea992a | 367 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 368 | |
1da177e4 | 369 | IP_NF_ASSERT(e); |
84018f55 | 370 | acpar.thoff = 0; |
a1ff4ac8 | 371 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
b4ba2611 | 372 | &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) { |
dcea992a | 373 | no_match: |
a1ff4ac8 JE |
374 | e = ip6t_next_entry(e); |
375 | continue; | |
376 | } | |
1da177e4 | 377 | |
ef53d702 | 378 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
379 | acpar.match = ematch->u.kernel.match; |
380 | acpar.matchinfo = ematch->data; | |
381 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 382 | goto no_match; |
ef53d702 | 383 | } |
dcea992a | 384 | |
261abc8c | 385 | ADD_COUNTER(e->counters, skb->len, 1); |
1da177e4 | 386 | |
d5d1baa1 | 387 | t = ip6t_get_target_c(e); |
a1ff4ac8 | 388 | IP_NF_ASSERT(t->u.kernel.target); |
ba9dda3a | 389 | |
07a93626 | 390 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
391 | /* The packet is traced: log it */ |
392 | if (unlikely(skb->nf_trace)) | |
393 | trace_packet(skb, hook, in, out, | |
394 | table->name, private, e); | |
ba9dda3a | 395 | #endif |
a1ff4ac8 JE |
396 | /* Standard target? */ |
397 | if (!t->u.kernel.target->target) { | |
398 | int v; | |
399 | ||
87a2e70d | 400 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
401 | if (v < 0) { |
402 | /* Pop from stack? */ | |
243bf6e2 | 403 | if (v != XT_RETURN) { |
95c96174 | 404 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 405 | break; |
1da177e4 | 406 | } |
db856674 | 407 | if (*stackptr <= origptr) |
f3c5c1bf JE |
408 | e = get_entry(table_base, |
409 | private->underflow[hook]); | |
410 | else | |
411 | e = ip6t_next_entry(jumpstack[--*stackptr]); | |
a1ff4ac8 JE |
412 | continue; |
413 | } | |
3666ed1c JP |
414 | if (table_base + v != ip6t_next_entry(e) && |
415 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
f3c5c1bf JE |
416 | if (*stackptr >= private->stacksize) { |
417 | verdict = NF_DROP; | |
418 | break; | |
419 | } | |
420 | jumpstack[(*stackptr)++] = e; | |
a1ff4ac8 | 421 | } |
1da177e4 | 422 | |
a1ff4ac8 | 423 | e = get_entry(table_base, v); |
7a6b1c46 JE |
424 | continue; |
425 | } | |
426 | ||
de74c169 JE |
427 | acpar.target = t->u.kernel.target; |
428 | acpar.targinfo = t->data; | |
7eb35586 | 429 | |
de74c169 | 430 | verdict = t->u.kernel.target->target(skb, &acpar); |
243bf6e2 | 431 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
432 | e = ip6t_next_entry(e); |
433 | else | |
434 | /* Verdict */ | |
435 | break; | |
b4ba2611 | 436 | } while (!acpar.hotdrop); |
1da177e4 | 437 | |
f3c5c1bf | 438 | *stackptr = origptr; |
7f5c6d4f ED |
439 | |
440 | xt_write_recseq_end(addend); | |
441 | local_bh_enable(); | |
1da177e4 LT |
442 | |
443 | #ifdef DEBUG_ALLOW_ALL | |
444 | return NF_ACCEPT; | |
445 | #else | |
b4ba2611 | 446 | if (acpar.hotdrop) |
1da177e4 LT |
447 | return NF_DROP; |
448 | else return verdict; | |
449 | #endif | |
450 | } | |
451 | ||
1da177e4 LT |
452 | /* Figures out from what hook each rule can be called: returns 0 if |
453 | there are loops. Puts hook bitmask in comefrom. */ | |
454 | static int | |
d5d1baa1 | 455 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 456 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
457 | { |
458 | unsigned int hook; | |
459 | ||
460 | /* No recursion; use packet counter to save back ptrs (reset | |
461 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 462 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 463 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 464 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
465 | |
466 | if (!(valid_hooks & (1 << hook))) | |
467 | continue; | |
468 | ||
469 | /* Set initial back pointer. */ | |
470 | e->counters.pcnt = pos; | |
471 | ||
472 | for (;;) { | |
87a2e70d | 473 | const struct xt_standard_target *t |
d5d1baa1 | 474 | = (void *)ip6t_get_target_c(e); |
9c547959 | 475 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 476 | |
6e23ae2a | 477 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
654d0fbd | 478 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
479 | hook, pos, e->comefrom); |
480 | return 0; | |
481 | } | |
9c547959 | 482 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
483 | |
484 | /* Unconditional return/END. */ | |
3666ed1c JP |
485 | if ((e->target_offset == sizeof(struct ip6t_entry) && |
486 | (strcmp(t->target.u.user.name, | |
243bf6e2 | 487 | XT_STANDARD_TARGET) == 0) && |
3666ed1c JP |
488 | t->verdict < 0 && |
489 | unconditional(&e->ipv6)) || visited) { | |
1da177e4 LT |
490 | unsigned int oldpos, size; |
491 | ||
1f9352ae | 492 | if ((strcmp(t->target.u.user.name, |
243bf6e2 | 493 | XT_STANDARD_TARGET) == 0) && |
1f9352ae | 494 | t->verdict < -NF_MAX_VERDICT - 1) { |
74c9c0c1 DM |
495 | duprintf("mark_source_chains: bad " |
496 | "negative verdict (%i)\n", | |
497 | t->verdict); | |
498 | return 0; | |
499 | } | |
500 | ||
1da177e4 LT |
501 | /* Return: backtrack through the last |
502 | big jump. */ | |
503 | do { | |
6e23ae2a | 504 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
505 | #ifdef DEBUG_IP_FIREWALL_USER |
506 | if (e->comefrom | |
6e23ae2a | 507 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
508 | duprintf("Back unset " |
509 | "on hook %u " | |
510 | "rule %u\n", | |
511 | hook, pos); | |
512 | } | |
513 | #endif | |
514 | oldpos = pos; | |
515 | pos = e->counters.pcnt; | |
516 | e->counters.pcnt = 0; | |
517 | ||
518 | /* We're at the start. */ | |
519 | if (pos == oldpos) | |
520 | goto next; | |
521 | ||
522 | e = (struct ip6t_entry *) | |
31836064 | 523 | (entry0 + pos); |
1da177e4 LT |
524 | } while (oldpos == pos + e->next_offset); |
525 | ||
526 | /* Move along one */ | |
527 | size = e->next_offset; | |
528 | e = (struct ip6t_entry *) | |
31836064 | 529 | (entry0 + pos + size); |
1da177e4 LT |
530 | e->counters.pcnt = pos; |
531 | pos += size; | |
532 | } else { | |
533 | int newpos = t->verdict; | |
534 | ||
535 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 536 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 537 | newpos >= 0) { |
74c9c0c1 DM |
538 | if (newpos > newinfo->size - |
539 | sizeof(struct ip6t_entry)) { | |
540 | duprintf("mark_source_chains: " | |
541 | "bad verdict (%i)\n", | |
542 | newpos); | |
543 | return 0; | |
544 | } | |
1da177e4 LT |
545 | /* This a jump; chase it. */ |
546 | duprintf("Jump rule %u -> %u\n", | |
547 | pos, newpos); | |
548 | } else { | |
549 | /* ... this is a fallthru */ | |
550 | newpos = pos + e->next_offset; | |
551 | } | |
552 | e = (struct ip6t_entry *) | |
31836064 | 553 | (entry0 + newpos); |
1da177e4 LT |
554 | e->counters.pcnt = pos; |
555 | pos = newpos; | |
556 | } | |
557 | } | |
558 | next: | |
559 | duprintf("Finished chain %u\n", hook); | |
560 | } | |
561 | return 1; | |
562 | } | |
563 | ||
87a2e70d | 564 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 565 | { |
6be3d859 JE |
566 | struct xt_mtdtor_param par; |
567 | ||
f54e9367 | 568 | par.net = net; |
6be3d859 JE |
569 | par.match = m->u.kernel.match; |
570 | par.matchinfo = m->data; | |
916a917d | 571 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
572 | if (par.match->destroy != NULL) |
573 | par.match->destroy(&par); | |
574 | module_put(par.match->me); | |
1da177e4 LT |
575 | } |
576 | ||
022748a9 | 577 | static int |
d5d1baa1 | 578 | check_entry(const struct ip6t_entry *e, const char *name) |
f173c8a1 | 579 | { |
87a2e70d | 580 | const struct xt_entry_target *t; |
f173c8a1 PM |
581 | |
582 | if (!ip6_checkentry(&e->ipv6)) { | |
583 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
584 | return -EINVAL; | |
585 | } | |
586 | ||
87a2e70d | 587 | if (e->target_offset + sizeof(struct xt_entry_target) > |
f173c8a1 PM |
588 | e->next_offset) |
589 | return -EINVAL; | |
590 | ||
d5d1baa1 | 591 | t = ip6t_get_target_c(e); |
f173c8a1 PM |
592 | if (e->target_offset + t->u.target_size > e->next_offset) |
593 | return -EINVAL; | |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
87a2e70d | 598 | static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
f173c8a1 | 599 | { |
9b4fce7a | 600 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
601 | int ret; |
602 | ||
9b4fce7a JE |
603 | par->match = m->u.kernel.match; |
604 | par->matchinfo = m->data; | |
605 | ||
916a917d | 606 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 607 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
367c6790 | 608 | if (ret < 0) { |
f173c8a1 | 609 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 610 | par.match->name); |
367c6790 | 611 | return ret; |
f173c8a1 | 612 | } |
367c6790 | 613 | return 0; |
f173c8a1 PM |
614 | } |
615 | ||
022748a9 | 616 | static int |
87a2e70d | 617 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 618 | { |
6709dbbb | 619 | struct xt_match *match; |
3cdc7c95 | 620 | int ret; |
1da177e4 | 621 | |
fd0ec0e6 JE |
622 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
623 | m->u.user.revision); | |
624 | if (IS_ERR(match)) { | |
f173c8a1 | 625 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 626 | return PTR_ERR(match); |
1da177e4 LT |
627 | } |
628 | m->u.kernel.match = match; | |
1da177e4 | 629 | |
6bdb331b | 630 | ret = check_match(m, par); |
3cdc7c95 PM |
631 | if (ret) |
632 | goto err; | |
633 | ||
1da177e4 | 634 | return 0; |
3cdc7c95 PM |
635 | err: |
636 | module_put(m->u.kernel.match->me); | |
637 | return ret; | |
1da177e4 LT |
638 | } |
639 | ||
add67461 | 640 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 641 | { |
87a2e70d | 642 | struct xt_entry_target *t = ip6t_get_target(e); |
af5d6dc2 | 643 | struct xt_tgchk_param par = { |
add67461 | 644 | .net = net, |
af5d6dc2 JE |
645 | .table = name, |
646 | .entryinfo = e, | |
647 | .target = t->u.kernel.target, | |
648 | .targinfo = t->data, | |
649 | .hook_mask = e->comefrom, | |
916a917d | 650 | .family = NFPROTO_IPV6, |
af5d6dc2 | 651 | }; |
1da177e4 | 652 | int ret; |
1da177e4 | 653 | |
f173c8a1 | 654 | t = ip6t_get_target(e); |
916a917d | 655 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 656 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
367c6790 | 657 | if (ret < 0) { |
f173c8a1 PM |
658 | duprintf("ip_tables: check failed for `%s'.\n", |
659 | t->u.kernel.target->name); | |
367c6790 | 660 | return ret; |
1da177e4 | 661 | } |
367c6790 | 662 | return 0; |
f173c8a1 | 663 | } |
1da177e4 | 664 | |
022748a9 | 665 | static int |
a83d8e8d | 666 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
0559518b | 667 | unsigned int size) |
f173c8a1 | 668 | { |
87a2e70d | 669 | struct xt_entry_target *t; |
f173c8a1 PM |
670 | struct xt_target *target; |
671 | int ret; | |
672 | unsigned int j; | |
9b4fce7a | 673 | struct xt_mtchk_param mtpar; |
dcea992a | 674 | struct xt_entry_match *ematch; |
f173c8a1 PM |
675 | |
676 | ret = check_entry(e, name); | |
677 | if (ret) | |
678 | return ret; | |
590bdf7f | 679 | |
1da177e4 | 680 | j = 0; |
a83d8e8d | 681 | mtpar.net = net; |
9b4fce7a JE |
682 | mtpar.table = name; |
683 | mtpar.entryinfo = &e->ipv6; | |
684 | mtpar.hook_mask = e->comefrom; | |
916a917d | 685 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 686 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 687 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 688 | if (ret != 0) |
6bdb331b JE |
689 | goto cleanup_matches; |
690 | ++j; | |
dcea992a | 691 | } |
1da177e4 LT |
692 | |
693 | t = ip6t_get_target(e); | |
d2a7b6ba JE |
694 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
695 | t->u.user.revision); | |
696 | if (IS_ERR(target)) { | |
f173c8a1 | 697 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 698 | ret = PTR_ERR(target); |
1da177e4 LT |
699 | goto cleanup_matches; |
700 | } | |
701 | t->u.kernel.target = target; | |
6b7d31fc | 702 | |
add67461 | 703 | ret = check_target(e, net, name); |
3cdc7c95 PM |
704 | if (ret) |
705 | goto err; | |
1da177e4 | 706 | return 0; |
3cdc7c95 PM |
707 | err: |
708 | module_put(t->u.kernel.target->me); | |
1da177e4 | 709 | cleanup_matches: |
6bdb331b JE |
710 | xt_ematch_foreach(ematch, e) { |
711 | if (j-- == 0) | |
dcea992a | 712 | break; |
6bdb331b JE |
713 | cleanup_match(ematch, net); |
714 | } | |
1da177e4 LT |
715 | return ret; |
716 | } | |
717 | ||
d5d1baa1 | 718 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 | 719 | { |
87a2e70d | 720 | const struct xt_entry_target *t; |
e2fe35c1 JE |
721 | unsigned int verdict; |
722 | ||
723 | if (!unconditional(&e->ipv6)) | |
724 | return false; | |
d5d1baa1 | 725 | t = ip6t_get_target_c(e); |
e2fe35c1 JE |
726 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
727 | return false; | |
87a2e70d | 728 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
729 | verdict = -verdict - 1; |
730 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
731 | } | |
732 | ||
022748a9 | 733 | static int |
1da177e4 | 734 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 735 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
736 | const unsigned char *base, |
737 | const unsigned char *limit, | |
1da177e4 LT |
738 | const unsigned int *hook_entries, |
739 | const unsigned int *underflows, | |
0559518b | 740 | unsigned int valid_hooks) |
1da177e4 LT |
741 | { |
742 | unsigned int h; | |
743 | ||
3666ed1c JP |
744 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
745 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
1da177e4 LT |
746 | duprintf("Bad offset %p\n", e); |
747 | return -EINVAL; | |
748 | } | |
749 | ||
750 | if (e->next_offset | |
87a2e70d | 751 | < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) { |
1da177e4 LT |
752 | duprintf("checking: element %p size %u\n", |
753 | e, e->next_offset); | |
754 | return -EINVAL; | |
755 | } | |
756 | ||
757 | /* Check hooks & underflows */ | |
6e23ae2a | 758 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
759 | if (!(valid_hooks & (1 << h))) |
760 | continue; | |
1da177e4 LT |
761 | if ((unsigned char *)e - base == hook_entries[h]) |
762 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 763 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
764 | if (!check_underflow(e)) { |
765 | pr_err("Underflows must be unconditional and " | |
766 | "use the STANDARD target with " | |
767 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
768 | return -EINVAL; |
769 | } | |
1da177e4 | 770 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 771 | } |
1da177e4 LT |
772 | } |
773 | ||
1da177e4 | 774 | /* Clear counters and comefrom */ |
2e4e6a17 | 775 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 776 | e->comefrom = 0; |
1da177e4 LT |
777 | return 0; |
778 | } | |
779 | ||
0559518b | 780 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
1da177e4 | 781 | { |
a2df1648 | 782 | struct xt_tgdtor_param par; |
87a2e70d | 783 | struct xt_entry_target *t; |
dcea992a | 784 | struct xt_entry_match *ematch; |
1da177e4 | 785 | |
1da177e4 | 786 | /* Cleanup all matches */ |
dcea992a | 787 | xt_ematch_foreach(ematch, e) |
6bdb331b | 788 | cleanup_match(ematch, net); |
1da177e4 | 789 | t = ip6t_get_target(e); |
a2df1648 | 790 | |
add67461 | 791 | par.net = net; |
a2df1648 JE |
792 | par.target = t->u.kernel.target; |
793 | par.targinfo = t->data; | |
916a917d | 794 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
795 | if (par.target->destroy != NULL) |
796 | par.target->destroy(&par); | |
797 | module_put(par.target->me); | |
1da177e4 LT |
798 | } |
799 | ||
800 | /* Checks and translates the user-supplied table segment (held in | |
801 | newinfo) */ | |
802 | static int | |
0f234214 JE |
803 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
804 | const struct ip6t_replace *repl) | |
1da177e4 | 805 | { |
72b2b1dd | 806 | struct ip6t_entry *iter; |
1da177e4 | 807 | unsigned int i; |
72b2b1dd | 808 | int ret = 0; |
1da177e4 | 809 | |
0f234214 JE |
810 | newinfo->size = repl->size; |
811 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
812 | |
813 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 814 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
815 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
816 | newinfo->underflow[i] = 0xFFFFFFFF; | |
817 | } | |
818 | ||
819 | duprintf("translate_table: size %u\n", newinfo->size); | |
820 | i = 0; | |
821 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
822 | xt_entry_foreach(iter, entry0, newinfo->size) { |
823 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
824 | entry0 + repl->size, |
825 | repl->hook_entry, | |
826 | repl->underflow, | |
827 | repl->valid_hooks); | |
72b2b1dd | 828 | if (ret != 0) |
0559518b JE |
829 | return ret; |
830 | ++i; | |
f3c5c1bf JE |
831 | if (strcmp(ip6t_get_target(iter)->u.user.name, |
832 | XT_ERROR_TARGET) == 0) | |
833 | ++newinfo->stacksize; | |
72b2b1dd | 834 | } |
1da177e4 | 835 | |
0f234214 | 836 | if (i != repl->num_entries) { |
1da177e4 | 837 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 838 | i, repl->num_entries); |
1da177e4 LT |
839 | return -EINVAL; |
840 | } | |
841 | ||
842 | /* Check hooks all assigned */ | |
6e23ae2a | 843 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 844 | /* Only hooks which are valid */ |
0f234214 | 845 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
846 | continue; |
847 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
848 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 849 | i, repl->hook_entry[i]); |
1da177e4 LT |
850 | return -EINVAL; |
851 | } | |
852 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
853 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 854 | i, repl->underflow[i]); |
1da177e4 LT |
855 | return -EINVAL; |
856 | } | |
857 | } | |
858 | ||
0f234214 | 859 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
860 | return -ELOOP; |
861 | ||
1da177e4 LT |
862 | /* Finally, each sanity check must pass */ |
863 | i = 0; | |
72b2b1dd | 864 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 865 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
866 | if (ret != 0) |
867 | break; | |
0559518b | 868 | ++i; |
72b2b1dd | 869 | } |
1da177e4 | 870 | |
74c9c0c1 | 871 | if (ret != 0) { |
0559518b JE |
872 | xt_entry_foreach(iter, entry0, newinfo->size) { |
873 | if (i-- == 0) | |
72b2b1dd | 874 | break; |
0559518b JE |
875 | cleanup_entry(iter, net); |
876 | } | |
74c9c0c1 DM |
877 | return ret; |
878 | } | |
1da177e4 LT |
879 | |
880 | /* And one copy for every other CPU */ | |
6f912042 | 881 | for_each_possible_cpu(i) { |
31836064 ED |
882 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
883 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
884 | } |
885 | ||
9c547959 | 886 | return ret; |
1da177e4 LT |
887 | } |
888 | ||
1da177e4 | 889 | static void |
2e4e6a17 HW |
890 | get_counters(const struct xt_table_info *t, |
891 | struct xt_counters counters[]) | |
1da177e4 | 892 | { |
72b2b1dd | 893 | struct ip6t_entry *iter; |
1da177e4 LT |
894 | unsigned int cpu; |
895 | unsigned int i; | |
896 | ||
6f912042 | 897 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 898 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 899 | |
1da177e4 | 900 | i = 0; |
0559518b | 901 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
83723d60 ED |
902 | u64 bcnt, pcnt; |
903 | unsigned int start; | |
904 | ||
905 | do { | |
7f5c6d4f | 906 | start = read_seqcount_begin(s); |
83723d60 ED |
907 | bcnt = iter->counters.bcnt; |
908 | pcnt = iter->counters.pcnt; | |
7f5c6d4f | 909 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
910 | |
911 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
912 | ++i; |
913 | } | |
1da177e4 | 914 | } |
78454473 SH |
915 | } |
916 | ||
d5d1baa1 | 917 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 918 | { |
ed1a6f5e | 919 | unsigned int countersize; |
2e4e6a17 | 920 | struct xt_counters *counters; |
d5d1baa1 | 921 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
922 | |
923 | /* We need atomic snapshot of counters: rest doesn't change | |
924 | (other than comefrom, which userspace doesn't care | |
925 | about). */ | |
2e4e6a17 | 926 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 927 | counters = vzalloc(countersize); |
1da177e4 LT |
928 | |
929 | if (counters == NULL) | |
942e4a2b | 930 | return ERR_PTR(-ENOMEM); |
78454473 | 931 | |
942e4a2b | 932 | get_counters(private, counters); |
78454473 | 933 | |
49a88d18 | 934 | return counters; |
ed1a6f5e PM |
935 | } |
936 | ||
937 | static int | |
938 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 939 | const struct xt_table *table, |
ed1a6f5e PM |
940 | void __user *userptr) |
941 | { | |
942 | unsigned int off, num; | |
d5d1baa1 | 943 | const struct ip6t_entry *e; |
ed1a6f5e | 944 | struct xt_counters *counters; |
5452e425 | 945 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 946 | int ret = 0; |
5452e425 | 947 | const void *loc_cpu_entry; |
ed1a6f5e PM |
948 | |
949 | counters = alloc_counters(table); | |
950 | if (IS_ERR(counters)) | |
951 | return PTR_ERR(counters); | |
952 | ||
9c547959 PM |
953 | /* choose the copy that is on our node/cpu, ... |
954 | * This choice is lazy (because current thread is | |
955 | * allowed to migrate to another cpu) | |
956 | */ | |
2e4e6a17 | 957 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 958 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
959 | ret = -EFAULT; |
960 | goto free_counters; | |
961 | } | |
962 | ||
963 | /* FIXME: use iterator macros --RR */ | |
964 | /* ... then go back and fix counters and names */ | |
965 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
966 | unsigned int i; | |
87a2e70d JE |
967 | const struct xt_entry_match *m; |
968 | const struct xt_entry_target *t; | |
1da177e4 | 969 | |
31836064 | 970 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
971 | if (copy_to_user(userptr + off |
972 | + offsetof(struct ip6t_entry, counters), | |
973 | &counters[num], | |
974 | sizeof(counters[num])) != 0) { | |
975 | ret = -EFAULT; | |
976 | goto free_counters; | |
977 | } | |
978 | ||
979 | for (i = sizeof(struct ip6t_entry); | |
980 | i < e->target_offset; | |
981 | i += m->u.match_size) { | |
982 | m = (void *)e + i; | |
983 | ||
984 | if (copy_to_user(userptr + off + i | |
87a2e70d | 985 | + offsetof(struct xt_entry_match, |
1da177e4 LT |
986 | u.user.name), |
987 | m->u.kernel.match->name, | |
988 | strlen(m->u.kernel.match->name)+1) | |
989 | != 0) { | |
990 | ret = -EFAULT; | |
991 | goto free_counters; | |
992 | } | |
993 | } | |
994 | ||
d5d1baa1 | 995 | t = ip6t_get_target_c(e); |
1da177e4 | 996 | if (copy_to_user(userptr + off + e->target_offset |
87a2e70d | 997 | + offsetof(struct xt_entry_target, |
1da177e4 LT |
998 | u.user.name), |
999 | t->u.kernel.target->name, | |
1000 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1001 | ret = -EFAULT; | |
1002 | goto free_counters; | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | free_counters: | |
1007 | vfree(counters); | |
1008 | return ret; | |
1009 | } | |
1010 | ||
3bc3fe5e | 1011 | #ifdef CONFIG_COMPAT |
739674fb | 1012 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
1013 | { |
1014 | int v = *(compat_int_t *)src; | |
1015 | ||
1016 | if (v > 0) | |
1017 | v += xt_compat_calc_jump(AF_INET6, v); | |
1018 | memcpy(dst, &v, sizeof(v)); | |
1019 | } | |
1020 | ||
739674fb | 1021 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
1022 | { |
1023 | compat_int_t cv = *(int *)src; | |
1024 | ||
1025 | if (cv > 0) | |
1026 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1027 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1028 | } | |
1029 | ||
d5d1baa1 | 1030 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 1031 | const struct xt_table_info *info, |
d5d1baa1 | 1032 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 1033 | { |
dcea992a | 1034 | const struct xt_entry_match *ematch; |
87a2e70d | 1035 | const struct xt_entry_target *t; |
3bc3fe5e PM |
1036 | unsigned int entry_offset; |
1037 | int off, i, ret; | |
1038 | ||
1039 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1040 | entry_offset = (void *)e - base; | |
dcea992a | 1041 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1042 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1043 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
1044 | off += xt_compat_target_offset(t->u.kernel.target); |
1045 | newinfo->size -= off; | |
1046 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1047 | if (ret) | |
1048 | return ret; | |
1049 | ||
1050 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1051 | if (info->hook_entry[i] && | |
1052 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1053 | newinfo->hook_entry[i] -= off; | |
1054 | if (info->underflow[i] && | |
1055 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1056 | newinfo->underflow[i] -= off; | |
1057 | } | |
1058 | return 0; | |
1059 | } | |
1060 | ||
1061 | static int compat_table_info(const struct xt_table_info *info, | |
1062 | struct xt_table_info *newinfo) | |
1063 | { | |
72b2b1dd | 1064 | struct ip6t_entry *iter; |
3bc3fe5e | 1065 | void *loc_cpu_entry; |
0559518b | 1066 | int ret; |
3bc3fe5e PM |
1067 | |
1068 | if (!newinfo || !info) | |
1069 | return -EINVAL; | |
1070 | ||
1071 | /* we dont care about newinfo->entries[] */ | |
1072 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1073 | newinfo->initial_entries = 0; | |
1074 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
255d0dc3 | 1075 | xt_compat_init_offsets(AF_INET6, info->number); |
72b2b1dd JE |
1076 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1077 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1078 | if (ret != 0) | |
0559518b | 1079 | return ret; |
72b2b1dd | 1080 | } |
0559518b | 1081 | return 0; |
3bc3fe5e PM |
1082 | } |
1083 | #endif | |
1084 | ||
d5d1baa1 JE |
1085 | static int get_info(struct net *net, void __user *user, |
1086 | const int *len, int compat) | |
433665c9 | 1087 | { |
12b00c2c | 1088 | char name[XT_TABLE_MAXNAMELEN]; |
433665c9 PM |
1089 | struct xt_table *t; |
1090 | int ret; | |
1091 | ||
1092 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1093 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1094 | sizeof(struct ip6t_getinfo)); |
1095 | return -EINVAL; | |
1096 | } | |
1097 | ||
1098 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1099 | return -EFAULT; | |
1100 | ||
12b00c2c | 1101 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
3bc3fe5e PM |
1102 | #ifdef CONFIG_COMPAT |
1103 | if (compat) | |
1104 | xt_compat_lock(AF_INET6); | |
1105 | #endif | |
336b517f | 1106 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 | 1107 | "ip6table_%s", name); |
0cc8d8df | 1108 | if (!IS_ERR_OR_NULL(t)) { |
433665c9 | 1109 | struct ip6t_getinfo info; |
5452e425 | 1110 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1111 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1112 | struct xt_table_info tmp; |
1113 | ||
3bc3fe5e | 1114 | if (compat) { |
3bc3fe5e PM |
1115 | ret = compat_table_info(private, &tmp); |
1116 | xt_compat_flush_offsets(AF_INET6); | |
1117 | private = &tmp; | |
1118 | } | |
1119 | #endif | |
cccbe5ef | 1120 | memset(&info, 0, sizeof(info)); |
433665c9 PM |
1121 | info.valid_hooks = t->valid_hooks; |
1122 | memcpy(info.hook_entry, private->hook_entry, | |
1123 | sizeof(info.hook_entry)); | |
1124 | memcpy(info.underflow, private->underflow, | |
1125 | sizeof(info.underflow)); | |
1126 | info.num_entries = private->number; | |
1127 | info.size = private->size; | |
b5dd674b | 1128 | strcpy(info.name, name); |
433665c9 PM |
1129 | |
1130 | if (copy_to_user(user, &info, *len) != 0) | |
1131 | ret = -EFAULT; | |
1132 | else | |
1133 | ret = 0; | |
1134 | ||
1135 | xt_table_unlock(t); | |
1136 | module_put(t->me); | |
1137 | } else | |
1138 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1139 | #ifdef CONFIG_COMPAT |
1140 | if (compat) | |
1141 | xt_compat_unlock(AF_INET6); | |
1142 | #endif | |
433665c9 PM |
1143 | return ret; |
1144 | } | |
1145 | ||
1da177e4 | 1146 | static int |
d5d1baa1 JE |
1147 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
1148 | const int *len) | |
1da177e4 LT |
1149 | { |
1150 | int ret; | |
d924357c | 1151 | struct ip6t_get_entries get; |
2e4e6a17 | 1152 | struct xt_table *t; |
1da177e4 | 1153 | |
d924357c | 1154 | if (*len < sizeof(get)) { |
c9d8fe13 | 1155 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1156 | return -EINVAL; |
1157 | } | |
1158 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1159 | return -EFAULT; | |
1160 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1161 | duprintf("get_entries: %u != %zu\n", |
1162 | *len, sizeof(get) + get.size); | |
d924357c PM |
1163 | return -EINVAL; |
1164 | } | |
1165 | ||
336b517f | 1166 | t = xt_find_table_lock(net, AF_INET6, get.name); |
0cc8d8df | 1167 | if (!IS_ERR_OR_NULL(t)) { |
2e4e6a17 HW |
1168 | struct xt_table_info *private = t->private; |
1169 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1170 | if (get.size == private->size) |
2e4e6a17 | 1171 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1172 | t, uptr->entrytable); |
1173 | else { | |
1174 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1175 | private->size, get.size); |
544473c1 | 1176 | ret = -EAGAIN; |
1da177e4 | 1177 | } |
6b7d31fc | 1178 | module_put(t->me); |
2e4e6a17 | 1179 | xt_table_unlock(t); |
1da177e4 | 1180 | } else |
6b7d31fc | 1181 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1182 | |
1183 | return ret; | |
1184 | } | |
1185 | ||
1186 | static int | |
336b517f | 1187 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1188 | struct xt_table_info *newinfo, unsigned int num_counters, |
1189 | void __user *counters_ptr) | |
1da177e4 LT |
1190 | { |
1191 | int ret; | |
2e4e6a17 | 1192 | struct xt_table *t; |
3bc3fe5e | 1193 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1194 | struct xt_counters *counters; |
5452e425 | 1195 | const void *loc_cpu_old_entry; |
72b2b1dd | 1196 | struct ip6t_entry *iter; |
1da177e4 | 1197 | |
3bc3fe5e | 1198 | ret = 0; |
83723d60 | 1199 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
1da177e4 LT |
1200 | if (!counters) { |
1201 | ret = -ENOMEM; | |
3bc3fe5e | 1202 | goto out; |
1da177e4 | 1203 | } |
1da177e4 | 1204 | |
336b517f | 1205 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1206 | "ip6table_%s", name); |
0cc8d8df | 1207 | if (IS_ERR_OR_NULL(t)) { |
6b7d31fc | 1208 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1209 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1210 | } |
1da177e4 LT |
1211 | |
1212 | /* You lied! */ | |
3bc3fe5e | 1213 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1214 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1215 | valid_hooks, t->valid_hooks); |
1da177e4 | 1216 | ret = -EINVAL; |
6b7d31fc | 1217 | goto put_module; |
1da177e4 LT |
1218 | } |
1219 | ||
3bc3fe5e | 1220 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1221 | if (!oldinfo) |
1222 | goto put_module; | |
1223 | ||
1224 | /* Update module usage count based on number of rules */ | |
1225 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1226 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1227 | if ((oldinfo->number > oldinfo->initial_entries) || |
1228 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1229 | module_put(t->me); |
1230 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1231 | (newinfo->number <= oldinfo->initial_entries)) | |
1232 | module_put(t->me); | |
1233 | ||
942e4a2b | 1234 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1235 | get_counters(oldinfo, counters); |
942e4a2b | 1236 | |
1da177e4 | 1237 | /* Decrease module usage counts and free resource */ |
31836064 | 1238 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
72b2b1dd | 1239 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1240 | cleanup_entry(iter, net); |
72b2b1dd | 1241 | |
2e4e6a17 | 1242 | xt_free_table_info(oldinfo); |
3bc3fe5e PM |
1243 | if (copy_to_user(counters_ptr, counters, |
1244 | sizeof(struct xt_counters) * num_counters) != 0) | |
1da177e4 LT |
1245 | ret = -EFAULT; |
1246 | vfree(counters); | |
2e4e6a17 | 1247 | xt_table_unlock(t); |
1da177e4 LT |
1248 | return ret; |
1249 | ||
1250 | put_module: | |
1251 | module_put(t->me); | |
2e4e6a17 | 1252 | xt_table_unlock(t); |
1da177e4 | 1253 | free_newinfo_counters_untrans: |
1da177e4 | 1254 | vfree(counters); |
3bc3fe5e PM |
1255 | out: |
1256 | return ret; | |
1257 | } | |
1258 | ||
1259 | static int | |
d5d1baa1 | 1260 | do_replace(struct net *net, const void __user *user, unsigned int len) |
3bc3fe5e PM |
1261 | { |
1262 | int ret; | |
1263 | struct ip6t_replace tmp; | |
1264 | struct xt_table_info *newinfo; | |
1265 | void *loc_cpu_entry; | |
72b2b1dd | 1266 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1267 | |
1268 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1269 | return -EFAULT; | |
1270 | ||
1271 | /* overflow check */ | |
1272 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1273 | return -ENOMEM; | |
6a8ab060 | 1274 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1275 | |
1276 | newinfo = xt_alloc_table_info(tmp.size); | |
1277 | if (!newinfo) | |
1278 | return -ENOMEM; | |
1279 | ||
1280 | /* choose the copy that is on our node/cpu */ | |
1281 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1282 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1283 | tmp.size) != 0) { | |
1284 | ret = -EFAULT; | |
1285 | goto free_newinfo; | |
1286 | } | |
1287 | ||
0f234214 | 1288 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1289 | if (ret != 0) |
1290 | goto free_newinfo; | |
1291 | ||
1292 | duprintf("ip_tables: Translated table\n"); | |
1293 | ||
336b517f | 1294 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1295 | tmp.num_counters, tmp.counters); |
1296 | if (ret) | |
1297 | goto free_newinfo_untrans; | |
1298 | return 0; | |
1299 | ||
1300 | free_newinfo_untrans: | |
72b2b1dd | 1301 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1302 | cleanup_entry(iter, net); |
1da177e4 | 1303 | free_newinfo: |
2e4e6a17 | 1304 | xt_free_table_info(newinfo); |
1da177e4 LT |
1305 | return ret; |
1306 | } | |
1307 | ||
1da177e4 | 1308 | static int |
d5d1baa1 | 1309 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
336b517f | 1310 | int compat) |
1da177e4 | 1311 | { |
942e4a2b | 1312 | unsigned int i, curcpu; |
3bc3fe5e PM |
1313 | struct xt_counters_info tmp; |
1314 | struct xt_counters *paddc; | |
1315 | unsigned int num_counters; | |
1316 | char *name; | |
1317 | int size; | |
1318 | void *ptmp; | |
2e4e6a17 | 1319 | struct xt_table *t; |
5452e425 | 1320 | const struct xt_table_info *private; |
6b7d31fc | 1321 | int ret = 0; |
5452e425 | 1322 | const void *loc_cpu_entry; |
72b2b1dd | 1323 | struct ip6t_entry *iter; |
7f5c6d4f | 1324 | unsigned int addend; |
3bc3fe5e PM |
1325 | #ifdef CONFIG_COMPAT |
1326 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1327 | |
3bc3fe5e PM |
1328 | if (compat) { |
1329 | ptmp = &compat_tmp; | |
1330 | size = sizeof(struct compat_xt_counters_info); | |
1331 | } else | |
1332 | #endif | |
1333 | { | |
1334 | ptmp = &tmp; | |
1335 | size = sizeof(struct xt_counters_info); | |
1336 | } | |
1337 | ||
1338 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1339 | return -EFAULT; |
1340 | ||
3bc3fe5e PM |
1341 | #ifdef CONFIG_COMPAT |
1342 | if (compat) { | |
1343 | num_counters = compat_tmp.num_counters; | |
1344 | name = compat_tmp.name; | |
1345 | } else | |
1346 | #endif | |
1347 | { | |
1348 | num_counters = tmp.num_counters; | |
1349 | name = tmp.name; | |
1350 | } | |
1351 | ||
1352 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1353 | return -EINVAL; |
1354 | ||
e12f8e29 | 1355 | paddc = vmalloc(len - size); |
1da177e4 LT |
1356 | if (!paddc) |
1357 | return -ENOMEM; | |
1358 | ||
3bc3fe5e | 1359 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1360 | ret = -EFAULT; |
1361 | goto free; | |
1362 | } | |
1363 | ||
336b517f | 1364 | t = xt_find_table_lock(net, AF_INET6, name); |
0cc8d8df | 1365 | if (IS_ERR_OR_NULL(t)) { |
6b7d31fc | 1366 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1367 | goto free; |
6b7d31fc | 1368 | } |
1da177e4 | 1369 | |
942e4a2b SH |
1370 | |
1371 | local_bh_disable(); | |
2e4e6a17 | 1372 | private = t->private; |
3bc3fe5e | 1373 | if (private->number != num_counters) { |
1da177e4 LT |
1374 | ret = -EINVAL; |
1375 | goto unlock_up_free; | |
1376 | } | |
1377 | ||
1378 | i = 0; | |
31836064 | 1379 | /* Choose the copy that is on our node */ |
942e4a2b | 1380 | curcpu = smp_processor_id(); |
7f5c6d4f | 1381 | addend = xt_write_recseq_begin(); |
942e4a2b | 1382 | loc_cpu_entry = private->entries[curcpu]; |
0559518b JE |
1383 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1384 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1385 | ++i; | |
1386 | } | |
7f5c6d4f | 1387 | xt_write_recseq_end(addend); |
942e4a2b | 1388 | |
1da177e4 | 1389 | unlock_up_free: |
942e4a2b | 1390 | local_bh_enable(); |
2e4e6a17 | 1391 | xt_table_unlock(t); |
6b7d31fc | 1392 | module_put(t->me); |
1da177e4 LT |
1393 | free: |
1394 | vfree(paddc); | |
1395 | ||
1396 | return ret; | |
1397 | } | |
1398 | ||
3bc3fe5e PM |
1399 | #ifdef CONFIG_COMPAT |
1400 | struct compat_ip6t_replace { | |
12b00c2c | 1401 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1402 | u32 valid_hooks; |
1403 | u32 num_entries; | |
1404 | u32 size; | |
1405 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1406 | u32 underflow[NF_INET_NUMHOOKS]; | |
1407 | u32 num_counters; | |
87a2e70d | 1408 | compat_uptr_t counters; /* struct xt_counters * */ |
3bc3fe5e PM |
1409 | struct compat_ip6t_entry entries[0]; |
1410 | }; | |
1411 | ||
1412 | static int | |
1413 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1414 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1415 | unsigned int i) |
3bc3fe5e | 1416 | { |
87a2e70d | 1417 | struct xt_entry_target *t; |
3bc3fe5e PM |
1418 | struct compat_ip6t_entry __user *ce; |
1419 | u_int16_t target_offset, next_offset; | |
1420 | compat_uint_t origsize; | |
dcea992a JE |
1421 | const struct xt_entry_match *ematch; |
1422 | int ret = 0; | |
3bc3fe5e | 1423 | |
3bc3fe5e PM |
1424 | origsize = *size; |
1425 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
0559518b JE |
1426 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1427 | copy_to_user(&ce->counters, &counters[i], | |
1428 | sizeof(counters[i])) != 0) | |
1429 | return -EFAULT; | |
3bc3fe5e PM |
1430 | |
1431 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1432 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1433 | ||
dcea992a JE |
1434 | xt_ematch_foreach(ematch, e) { |
1435 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1436 | if (ret != 0) | |
6bdb331b | 1437 | return ret; |
dcea992a | 1438 | } |
3bc3fe5e | 1439 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1440 | t = ip6t_get_target(e); |
1441 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1442 | if (ret) | |
0559518b | 1443 | return ret; |
3bc3fe5e | 1444 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1445 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1446 | put_user(next_offset, &ce->next_offset) != 0) | |
1447 | return -EFAULT; | |
3bc3fe5e | 1448 | return 0; |
3bc3fe5e PM |
1449 | } |
1450 | ||
022748a9 | 1451 | static int |
87a2e70d | 1452 | compat_find_calc_match(struct xt_entry_match *m, |
3bc3fe5e PM |
1453 | const char *name, |
1454 | const struct ip6t_ip6 *ipv6, | |
1455 | unsigned int hookmask, | |
6bdb331b | 1456 | int *size) |
3bc3fe5e PM |
1457 | { |
1458 | struct xt_match *match; | |
1459 | ||
fd0ec0e6 JE |
1460 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
1461 | m->u.user.revision); | |
1462 | if (IS_ERR(match)) { | |
3bc3fe5e PM |
1463 | duprintf("compat_check_calc_match: `%s' not found\n", |
1464 | m->u.user.name); | |
fd0ec0e6 | 1465 | return PTR_ERR(match); |
3bc3fe5e PM |
1466 | } |
1467 | m->u.kernel.match = match; | |
1468 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1469 | return 0; |
1470 | } | |
1471 | ||
0559518b | 1472 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e | 1473 | { |
87a2e70d | 1474 | struct xt_entry_target *t; |
dcea992a | 1475 | struct xt_entry_match *ematch; |
3bc3fe5e | 1476 | |
3bc3fe5e | 1477 | /* Cleanup all matches */ |
dcea992a | 1478 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1479 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1480 | t = compat_ip6t_get_target(e); |
1481 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1482 | } |
1483 | ||
022748a9 | 1484 | static int |
3bc3fe5e PM |
1485 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1486 | struct xt_table_info *newinfo, | |
1487 | unsigned int *size, | |
d5d1baa1 JE |
1488 | const unsigned char *base, |
1489 | const unsigned char *limit, | |
1490 | const unsigned int *hook_entries, | |
1491 | const unsigned int *underflows, | |
3bc3fe5e PM |
1492 | const char *name) |
1493 | { | |
dcea992a | 1494 | struct xt_entry_match *ematch; |
87a2e70d | 1495 | struct xt_entry_target *t; |
3bc3fe5e PM |
1496 | struct xt_target *target; |
1497 | unsigned int entry_offset; | |
b0a6363c PM |
1498 | unsigned int j; |
1499 | int ret, off, h; | |
3bc3fe5e PM |
1500 | |
1501 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1502 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
1503 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
3bc3fe5e PM |
1504 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1505 | return -EINVAL; | |
1506 | } | |
1507 | ||
1508 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1509 | sizeof(struct compat_xt_entry_target)) { | |
1510 | duprintf("checking: element %p size %u\n", | |
1511 | e, e->next_offset); | |
1512 | return -EINVAL; | |
1513 | } | |
1514 | ||
1515 | /* For purposes of check_entry casting the compat entry is fine */ | |
1516 | ret = check_entry((struct ip6t_entry *)e, name); | |
1517 | if (ret) | |
1518 | return ret; | |
1519 | ||
1520 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1521 | entry_offset = (void *)e - (void *)base; | |
1522 | j = 0; | |
dcea992a JE |
1523 | xt_ematch_foreach(ematch, e) { |
1524 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1525 | &e->ipv6, e->comefrom, &off); |
dcea992a | 1526 | if (ret != 0) |
6bdb331b JE |
1527 | goto release_matches; |
1528 | ++j; | |
dcea992a | 1529 | } |
3bc3fe5e PM |
1530 | |
1531 | t = compat_ip6t_get_target(e); | |
d2a7b6ba JE |
1532 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
1533 | t->u.user.revision); | |
1534 | if (IS_ERR(target)) { | |
3bc3fe5e PM |
1535 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
1536 | t->u.user.name); | |
d2a7b6ba | 1537 | ret = PTR_ERR(target); |
3bc3fe5e PM |
1538 | goto release_matches; |
1539 | } | |
1540 | t->u.kernel.target = target; | |
1541 | ||
1542 | off += xt_compat_target_offset(target); | |
1543 | *size += off; | |
1544 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1545 | if (ret) | |
1546 | goto out; | |
1547 | ||
1548 | /* Check hooks & underflows */ | |
1549 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1550 | if ((unsigned char *)e - base == hook_entries[h]) | |
1551 | newinfo->hook_entry[h] = hook_entries[h]; | |
1552 | if ((unsigned char *)e - base == underflows[h]) | |
1553 | newinfo->underflow[h] = underflows[h]; | |
1554 | } | |
1555 | ||
1556 | /* Clear counters and comefrom */ | |
1557 | memset(&e->counters, 0, sizeof(e->counters)); | |
1558 | e->comefrom = 0; | |
3bc3fe5e PM |
1559 | return 0; |
1560 | ||
1561 | out: | |
1562 | module_put(t->u.kernel.target->me); | |
1563 | release_matches: | |
6bdb331b JE |
1564 | xt_ematch_foreach(ematch, e) { |
1565 | if (j-- == 0) | |
dcea992a | 1566 | break; |
6bdb331b JE |
1567 | module_put(ematch->u.kernel.match->me); |
1568 | } | |
3bc3fe5e PM |
1569 | return ret; |
1570 | } | |
1571 | ||
1572 | static int | |
1573 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1574 | unsigned int *size, const char *name, | |
1575 | struct xt_table_info *newinfo, unsigned char *base) | |
1576 | { | |
87a2e70d | 1577 | struct xt_entry_target *t; |
3bc3fe5e PM |
1578 | struct ip6t_entry *de; |
1579 | unsigned int origsize; | |
1580 | int ret, h; | |
dcea992a | 1581 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1582 | |
1583 | ret = 0; | |
1584 | origsize = *size; | |
1585 | de = (struct ip6t_entry *)*dstptr; | |
1586 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1587 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1588 | ||
1589 | *dstptr += sizeof(struct ip6t_entry); | |
1590 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1591 | ||
dcea992a JE |
1592 | xt_ematch_foreach(ematch, e) { |
1593 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1594 | if (ret != 0) | |
6bdb331b | 1595 | return ret; |
dcea992a | 1596 | } |
3bc3fe5e PM |
1597 | de->target_offset = e->target_offset - (origsize - *size); |
1598 | t = compat_ip6t_get_target(e); | |
3bc3fe5e PM |
1599 | xt_compat_target_from_user(t, dstptr, size); |
1600 | ||
1601 | de->next_offset = e->next_offset - (origsize - *size); | |
1602 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1603 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1604 | newinfo->hook_entry[h] -= origsize - *size; | |
1605 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1606 | newinfo->underflow[h] -= origsize - *size; | |
1607 | } | |
1608 | return ret; | |
1609 | } | |
1610 | ||
f54e9367 | 1611 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
0559518b | 1612 | const char *name) |
3bc3fe5e | 1613 | { |
b0a6363c | 1614 | unsigned int j; |
dcea992a | 1615 | int ret = 0; |
9b4fce7a | 1616 | struct xt_mtchk_param mtpar; |
dcea992a | 1617 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1618 | |
1619 | j = 0; | |
f54e9367 | 1620 | mtpar.net = net; |
9b4fce7a JE |
1621 | mtpar.table = name; |
1622 | mtpar.entryinfo = &e->ipv6; | |
1623 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1624 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 1625 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1626 | ret = check_match(ematch, &mtpar); |
dcea992a | 1627 | if (ret != 0) |
6bdb331b JE |
1628 | goto cleanup_matches; |
1629 | ++j; | |
dcea992a | 1630 | } |
3bc3fe5e | 1631 | |
add67461 | 1632 | ret = check_target(e, net, name); |
3bc3fe5e PM |
1633 | if (ret) |
1634 | goto cleanup_matches; | |
3bc3fe5e PM |
1635 | return 0; |
1636 | ||
1637 | cleanup_matches: | |
6bdb331b JE |
1638 | xt_ematch_foreach(ematch, e) { |
1639 | if (j-- == 0) | |
dcea992a | 1640 | break; |
6bdb331b JE |
1641 | cleanup_match(ematch, net); |
1642 | } | |
3bc3fe5e PM |
1643 | return ret; |
1644 | } | |
1645 | ||
1646 | static int | |
f54e9367 AD |
1647 | translate_compat_table(struct net *net, |
1648 | const char *name, | |
3bc3fe5e PM |
1649 | unsigned int valid_hooks, |
1650 | struct xt_table_info **pinfo, | |
1651 | void **pentry0, | |
1652 | unsigned int total_size, | |
1653 | unsigned int number, | |
1654 | unsigned int *hook_entries, | |
1655 | unsigned int *underflows) | |
1656 | { | |
1657 | unsigned int i, j; | |
1658 | struct xt_table_info *newinfo, *info; | |
1659 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1660 | struct compat_ip6t_entry *iter0; |
1661 | struct ip6t_entry *iter1; | |
3bc3fe5e | 1662 | unsigned int size; |
72b2b1dd | 1663 | int ret = 0; |
3bc3fe5e PM |
1664 | |
1665 | info = *pinfo; | |
1666 | entry0 = *pentry0; | |
1667 | size = total_size; | |
1668 | info->number = number; | |
1669 | ||
1670 | /* Init all hooks to impossible value. */ | |
1671 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1672 | info->hook_entry[i] = 0xFFFFFFFF; | |
1673 | info->underflow[i] = 0xFFFFFFFF; | |
1674 | } | |
1675 | ||
1676 | duprintf("translate_compat_table: size %u\n", info->size); | |
1677 | j = 0; | |
1678 | xt_compat_lock(AF_INET6); | |
255d0dc3 | 1679 | xt_compat_init_offsets(AF_INET6, number); |
3bc3fe5e | 1680 | /* Walk through entries, checking offsets. */ |
72b2b1dd JE |
1681 | xt_entry_foreach(iter0, entry0, total_size) { |
1682 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1683 | entry0, |
1684 | entry0 + total_size, | |
1685 | hook_entries, | |
1686 | underflows, | |
1687 | name); | |
72b2b1dd | 1688 | if (ret != 0) |
0559518b JE |
1689 | goto out_unlock; |
1690 | ++j; | |
72b2b1dd | 1691 | } |
3bc3fe5e PM |
1692 | |
1693 | ret = -EINVAL; | |
1694 | if (j != number) { | |
1695 | duprintf("translate_compat_table: %u not %u entries\n", | |
1696 | j, number); | |
1697 | goto out_unlock; | |
1698 | } | |
1699 | ||
1700 | /* Check hooks all assigned */ | |
1701 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1702 | /* Only hooks which are valid */ | |
1703 | if (!(valid_hooks & (1 << i))) | |
1704 | continue; | |
1705 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1706 | duprintf("Invalid hook entry %u %u\n", | |
1707 | i, hook_entries[i]); | |
1708 | goto out_unlock; | |
1709 | } | |
1710 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1711 | duprintf("Invalid underflow %u %u\n", | |
1712 | i, underflows[i]); | |
1713 | goto out_unlock; | |
1714 | } | |
1715 | } | |
1716 | ||
1717 | ret = -ENOMEM; | |
1718 | newinfo = xt_alloc_table_info(size); | |
1719 | if (!newinfo) | |
1720 | goto out_unlock; | |
1721 | ||
1722 | newinfo->number = number; | |
1723 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1724 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1725 | newinfo->underflow[i] = info->underflow[i]; | |
1726 | } | |
1727 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1728 | pos = entry1; | |
1729 | size = total_size; | |
72b2b1dd | 1730 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1731 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1732 | name, newinfo, entry1); | |
72b2b1dd JE |
1733 | if (ret != 0) |
1734 | break; | |
1735 | } | |
3bc3fe5e PM |
1736 | xt_compat_flush_offsets(AF_INET6); |
1737 | xt_compat_unlock(AF_INET6); | |
1738 | if (ret) | |
1739 | goto free_newinfo; | |
1740 | ||
1741 | ret = -ELOOP; | |
1742 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1743 | goto free_newinfo; | |
1744 | ||
1745 | i = 0; | |
72b2b1dd | 1746 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1747 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1748 | if (ret != 0) |
1749 | break; | |
0559518b | 1750 | ++i; |
cca77b7c FW |
1751 | if (strcmp(ip6t_get_target(iter1)->u.user.name, |
1752 | XT_ERROR_TARGET) == 0) | |
1753 | ++newinfo->stacksize; | |
72b2b1dd | 1754 | } |
3bc3fe5e | 1755 | if (ret) { |
72b2b1dd JE |
1756 | /* |
1757 | * The first i matches need cleanup_entry (calls ->destroy) | |
1758 | * because they had called ->check already. The other j-i | |
1759 | * entries need only release. | |
1760 | */ | |
1761 | int skip = i; | |
3bc3fe5e | 1762 | j -= i; |
72b2b1dd JE |
1763 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1764 | if (skip-- > 0) | |
1765 | continue; | |
0559518b | 1766 | if (j-- == 0) |
72b2b1dd | 1767 | break; |
0559518b | 1768 | compat_release_entry(iter0); |
72b2b1dd | 1769 | } |
0559518b JE |
1770 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1771 | if (i-- == 0) | |
72b2b1dd | 1772 | break; |
0559518b JE |
1773 | cleanup_entry(iter1, net); |
1774 | } | |
3bc3fe5e PM |
1775 | xt_free_table_info(newinfo); |
1776 | return ret; | |
1777 | } | |
1778 | ||
1779 | /* And one copy for every other CPU */ | |
1780 | for_each_possible_cpu(i) | |
1781 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1782 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1783 | ||
1784 | *pinfo = newinfo; | |
1785 | *pentry0 = entry1; | |
1786 | xt_free_table_info(info); | |
1787 | return 0; | |
1788 | ||
1789 | free_newinfo: | |
1790 | xt_free_table_info(newinfo); | |
1791 | out: | |
0559518b JE |
1792 | xt_entry_foreach(iter0, entry0, total_size) { |
1793 | if (j-- == 0) | |
72b2b1dd | 1794 | break; |
0559518b JE |
1795 | compat_release_entry(iter0); |
1796 | } | |
3bc3fe5e PM |
1797 | return ret; |
1798 | out_unlock: | |
1799 | xt_compat_flush_offsets(AF_INET6); | |
1800 | xt_compat_unlock(AF_INET6); | |
1801 | goto out; | |
1802 | } | |
1803 | ||
1804 | static int | |
336b517f | 1805 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1806 | { |
1807 | int ret; | |
1808 | struct compat_ip6t_replace tmp; | |
1809 | struct xt_table_info *newinfo; | |
1810 | void *loc_cpu_entry; | |
72b2b1dd | 1811 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1812 | |
1813 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1814 | return -EFAULT; | |
1815 | ||
1816 | /* overflow check */ | |
1817 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1818 | return -ENOMEM; | |
1819 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1820 | return -ENOMEM; | |
6a8ab060 | 1821 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1822 | |
1823 | newinfo = xt_alloc_table_info(tmp.size); | |
1824 | if (!newinfo) | |
1825 | return -ENOMEM; | |
1826 | ||
9c547959 | 1827 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1828 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1829 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1830 | tmp.size) != 0) { | |
1831 | ret = -EFAULT; | |
1832 | goto free_newinfo; | |
1833 | } | |
1834 | ||
f54e9367 | 1835 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1836 | &newinfo, &loc_cpu_entry, tmp.size, |
1837 | tmp.num_entries, tmp.hook_entry, | |
1838 | tmp.underflow); | |
1839 | if (ret != 0) | |
1840 | goto free_newinfo; | |
1841 | ||
1842 | duprintf("compat_do_replace: Translated table\n"); | |
1843 | ||
336b517f | 1844 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1845 | tmp.num_counters, compat_ptr(tmp.counters)); |
1846 | if (ret) | |
1847 | goto free_newinfo_untrans; | |
1848 | return 0; | |
1849 | ||
1850 | free_newinfo_untrans: | |
72b2b1dd | 1851 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1852 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1853 | free_newinfo: |
1854 | xt_free_table_info(newinfo); | |
1855 | return ret; | |
1856 | } | |
1857 | ||
1858 | static int | |
1859 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1860 | unsigned int len) | |
1861 | { | |
1862 | int ret; | |
1863 | ||
af31f412 | 1864 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1865 | return -EPERM; |
1866 | ||
1867 | switch (cmd) { | |
1868 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1869 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1870 | break; |
1871 | ||
1872 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1873 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1874 | break; |
1875 | ||
1876 | default: | |
1877 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1878 | ret = -EINVAL; | |
1879 | } | |
1880 | ||
1881 | return ret; | |
1882 | } | |
1883 | ||
1884 | struct compat_ip6t_get_entries { | |
12b00c2c | 1885 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1886 | compat_uint_t size; |
1887 | struct compat_ip6t_entry entrytable[0]; | |
1888 | }; | |
1889 | ||
1890 | static int | |
1891 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1892 | void __user *userptr) | |
1893 | { | |
1894 | struct xt_counters *counters; | |
5452e425 | 1895 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1896 | void __user *pos; |
1897 | unsigned int size; | |
1898 | int ret = 0; | |
5452e425 | 1899 | const void *loc_cpu_entry; |
3bc3fe5e | 1900 | unsigned int i = 0; |
72b2b1dd | 1901 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1902 | |
1903 | counters = alloc_counters(table); | |
1904 | if (IS_ERR(counters)) | |
1905 | return PTR_ERR(counters); | |
1906 | ||
1907 | /* choose the copy that is on our node/cpu, ... | |
1908 | * This choice is lazy (because current thread is | |
1909 | * allowed to migrate to another cpu) | |
1910 | */ | |
1911 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1912 | pos = userptr; | |
1913 | size = total_size; | |
72b2b1dd JE |
1914 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1915 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1916 | &size, counters, i++); |
72b2b1dd JE |
1917 | if (ret != 0) |
1918 | break; | |
1919 | } | |
3bc3fe5e PM |
1920 | |
1921 | vfree(counters); | |
1922 | return ret; | |
1923 | } | |
1924 | ||
1925 | static int | |
336b517f AD |
1926 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1927 | int *len) | |
3bc3fe5e PM |
1928 | { |
1929 | int ret; | |
1930 | struct compat_ip6t_get_entries get; | |
1931 | struct xt_table *t; | |
1932 | ||
1933 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1934 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1935 | return -EINVAL; |
1936 | } | |
1937 | ||
1938 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1939 | return -EFAULT; | |
1940 | ||
1941 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1942 | duprintf("compat_get_entries: %u != %zu\n", |
1943 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1944 | return -EINVAL; |
1945 | } | |
1946 | ||
1947 | xt_compat_lock(AF_INET6); | |
336b517f | 1948 | t = xt_find_table_lock(net, AF_INET6, get.name); |
0cc8d8df | 1949 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1950 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1951 | struct xt_table_info info; |
9c547959 | 1952 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1953 | ret = compat_table_info(private, &info); |
1954 | if (!ret && get.size == info.size) { | |
1955 | ret = compat_copy_entries_to_user(private->size, | |
1956 | t, uptr->entrytable); | |
1957 | } else if (!ret) { | |
1958 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1959 | private->size, get.size); |
544473c1 | 1960 | ret = -EAGAIN; |
3bc3fe5e PM |
1961 | } |
1962 | xt_compat_flush_offsets(AF_INET6); | |
1963 | module_put(t->me); | |
1964 | xt_table_unlock(t); | |
1965 | } else | |
1966 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1967 | ||
1968 | xt_compat_unlock(AF_INET6); | |
1969 | return ret; | |
1970 | } | |
1971 | ||
1972 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
1973 | ||
1974 | static int | |
1975 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1976 | { | |
1977 | int ret; | |
1978 | ||
af31f412 | 1979 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1980 | return -EPERM; |
1981 | ||
1982 | switch (cmd) { | |
1983 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 1984 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1985 | break; |
1986 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 1987 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
1988 | break; |
1989 | default: | |
1990 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
1991 | } | |
1992 | return ret; | |
1993 | } | |
1994 | #endif | |
1995 | ||
1da177e4 LT |
1996 | static int |
1997 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
1998 | { | |
1999 | int ret; | |
2000 | ||
af31f412 | 2001 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2002 | return -EPERM; |
2003 | ||
2004 | switch (cmd) { | |
2005 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2006 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2007 | break; |
2008 | ||
2009 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2010 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2011 | break; |
2012 | ||
2013 | default: | |
2014 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2015 | ret = -EINVAL; | |
2016 | } | |
2017 | ||
2018 | return ret; | |
2019 | } | |
2020 | ||
2021 | static int | |
2022 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2023 | { | |
2024 | int ret; | |
2025 | ||
af31f412 | 2026 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2027 | return -EPERM; |
2028 | ||
2029 | switch (cmd) { | |
433665c9 | 2030 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2031 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2032 | break; |
1da177e4 | 2033 | |
d924357c | 2034 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2035 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2036 | break; |
1da177e4 | 2037 | |
6b7d31fc HW |
2038 | case IP6T_SO_GET_REVISION_MATCH: |
2039 | case IP6T_SO_GET_REVISION_TARGET: { | |
12b00c2c | 2040 | struct xt_get_revision rev; |
2e4e6a17 | 2041 | int target; |
6b7d31fc HW |
2042 | |
2043 | if (*len != sizeof(rev)) { | |
2044 | ret = -EINVAL; | |
2045 | break; | |
2046 | } | |
2047 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2048 | ret = -EFAULT; | |
2049 | break; | |
2050 | } | |
6a8ab060 | 2051 | rev.name[sizeof(rev.name)-1] = 0; |
6b7d31fc HW |
2052 | |
2053 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2054 | target = 1; |
6b7d31fc | 2055 | else |
2e4e6a17 | 2056 | target = 0; |
6b7d31fc | 2057 | |
2e4e6a17 HW |
2058 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2059 | rev.revision, | |
2060 | target, &ret), | |
6b7d31fc HW |
2061 | "ip6t_%s", rev.name); |
2062 | break; | |
2063 | } | |
2064 | ||
1da177e4 LT |
2065 | default: |
2066 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2067 | ret = -EINVAL; | |
2068 | } | |
2069 | ||
2070 | return ret; | |
2071 | } | |
2072 | ||
35aad0ff JE |
2073 | struct xt_table *ip6t_register_table(struct net *net, |
2074 | const struct xt_table *table, | |
336b517f | 2075 | const struct ip6t_replace *repl) |
1da177e4 LT |
2076 | { |
2077 | int ret; | |
2e4e6a17 | 2078 | struct xt_table_info *newinfo; |
f3c5c1bf | 2079 | struct xt_table_info bootstrap = {0}; |
31836064 | 2080 | void *loc_cpu_entry; |
a98da11d | 2081 | struct xt_table *new_table; |
1da177e4 | 2082 | |
2e4e6a17 | 2083 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2084 | if (!newinfo) { |
2085 | ret = -ENOMEM; | |
2086 | goto out; | |
2087 | } | |
1da177e4 | 2088 | |
9c547959 | 2089 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2090 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2091 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2092 | |
0f234214 | 2093 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2094 | if (ret != 0) |
2095 | goto out_free; | |
1da177e4 | 2096 | |
336b517f | 2097 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2098 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2099 | ret = PTR_ERR(new_table); |
2100 | goto out_free; | |
1da177e4 | 2101 | } |
44d34e72 | 2102 | return new_table; |
1da177e4 | 2103 | |
44d34e72 AD |
2104 | out_free: |
2105 | xt_free_table_info(newinfo); | |
2106 | out: | |
2107 | return ERR_PTR(ret); | |
1da177e4 LT |
2108 | } |
2109 | ||
f54e9367 | 2110 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2111 | { |
2e4e6a17 | 2112 | struct xt_table_info *private; |
31836064 | 2113 | void *loc_cpu_entry; |
df200969 | 2114 | struct module *table_owner = table->me; |
72b2b1dd | 2115 | struct ip6t_entry *iter; |
31836064 | 2116 | |
2e4e6a17 | 2117 | private = xt_unregister_table(table); |
1da177e4 LT |
2118 | |
2119 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2120 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2121 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2122 | cleanup_entry(iter, net); |
df200969 AD |
2123 | if (private->number > private->initial_entries) |
2124 | module_put(table_owner); | |
2e4e6a17 | 2125 | xt_free_table_info(private); |
1da177e4 LT |
2126 | } |
2127 | ||
2128 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2129 | static inline bool |
1da177e4 LT |
2130 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2131 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2132 | bool invert) |
1da177e4 LT |
2133 | { |
2134 | return (type == test_type && code >= min_code && code <= max_code) | |
2135 | ^ invert; | |
2136 | } | |
2137 | ||
1d93a9cb | 2138 | static bool |
62fc8051 | 2139 | icmp6_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2140 | { |
5452e425 JE |
2141 | const struct icmp6hdr *ic; |
2142 | struct icmp6hdr _icmph; | |
f7108a20 | 2143 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2144 | |
2145 | /* Must not be a fragment. */ | |
f7108a20 | 2146 | if (par->fragoff != 0) |
1d93a9cb | 2147 | return false; |
1da177e4 | 2148 | |
f7108a20 | 2149 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2150 | if (ic == NULL) { |
2151 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2152 | * can't. Hence, no choice but to drop. |
2153 | */ | |
1da177e4 | 2154 | duprintf("Dropping evil ICMP tinygram.\n"); |
b4ba2611 | 2155 | par->hotdrop = true; |
1d93a9cb | 2156 | return false; |
1da177e4 LT |
2157 | } |
2158 | ||
2159 | return icmp6_type_code_match(icmpinfo->type, | |
2160 | icmpinfo->code[0], | |
2161 | icmpinfo->code[1], | |
2162 | ic->icmp6_type, ic->icmp6_code, | |
2163 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2164 | } | |
2165 | ||
2166 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 2167 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2168 | { |
9b4fce7a | 2169 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2170 | |
7f939713 | 2171 | /* Must specify no unknown invflags */ |
bd414ee6 | 2172 | return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2173 | } |
2174 | ||
2175 | /* The built-in targets: standard (NULL) and error. */ | |
4538506b JE |
2176 | static struct xt_target ip6t_builtin_tg[] __read_mostly = { |
2177 | { | |
243bf6e2 | 2178 | .name = XT_STANDARD_TARGET, |
4538506b JE |
2179 | .targetsize = sizeof(int), |
2180 | .family = NFPROTO_IPV6, | |
3bc3fe5e | 2181 | #ifdef CONFIG_COMPAT |
4538506b JE |
2182 | .compatsize = sizeof(compat_int_t), |
2183 | .compat_from_user = compat_standard_from_user, | |
2184 | .compat_to_user = compat_standard_to_user, | |
3bc3fe5e | 2185 | #endif |
4538506b JE |
2186 | }, |
2187 | { | |
243bf6e2 | 2188 | .name = XT_ERROR_TARGET, |
4538506b | 2189 | .target = ip6t_error, |
12b00c2c | 2190 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
2191 | .family = NFPROTO_IPV6, |
2192 | }, | |
1da177e4 LT |
2193 | }; |
2194 | ||
2195 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2196 | .pf = PF_INET6, | |
2197 | .set_optmin = IP6T_BASE_CTL, | |
2198 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2199 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2200 | #ifdef CONFIG_COMPAT |
2201 | .compat_set = compat_do_ip6t_set_ctl, | |
2202 | #endif | |
1da177e4 LT |
2203 | .get_optmin = IP6T_BASE_CTL, |
2204 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2205 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2206 | #ifdef CONFIG_COMPAT |
2207 | .compat_get = compat_do_ip6t_get_ctl, | |
2208 | #endif | |
16fcec35 | 2209 | .owner = THIS_MODULE, |
1da177e4 LT |
2210 | }; |
2211 | ||
4538506b JE |
2212 | static struct xt_match ip6t_builtin_mt[] __read_mostly = { |
2213 | { | |
2214 | .name = "icmp6", | |
2215 | .match = icmp6_match, | |
2216 | .matchsize = sizeof(struct ip6t_icmp), | |
2217 | .checkentry = icmp6_checkentry, | |
2218 | .proto = IPPROTO_ICMPV6, | |
2219 | .family = NFPROTO_IPV6, | |
2220 | }, | |
1da177e4 LT |
2221 | }; |
2222 | ||
3cb609d5 AD |
2223 | static int __net_init ip6_tables_net_init(struct net *net) |
2224 | { | |
383ca5b8 | 2225 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2226 | } |
2227 | ||
2228 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2229 | { | |
383ca5b8 | 2230 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2231 | } |
2232 | ||
2233 | static struct pernet_operations ip6_tables_net_ops = { | |
2234 | .init = ip6_tables_net_init, | |
2235 | .exit = ip6_tables_net_exit, | |
2236 | }; | |
2237 | ||
65b4b4e8 | 2238 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2239 | { |
2240 | int ret; | |
2241 | ||
3cb609d5 | 2242 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2243 | if (ret < 0) |
2244 | goto err1; | |
2e4e6a17 | 2245 | |
25985edc | 2246 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 2247 | ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 PM |
2248 | if (ret < 0) |
2249 | goto err2; | |
4538506b | 2250 | ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 PM |
2251 | if (ret < 0) |
2252 | goto err4; | |
1da177e4 LT |
2253 | |
2254 | /* Register setsockopt */ | |
2255 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2256 | if (ret < 0) |
2257 | goto err5; | |
1da177e4 | 2258 | |
ff67e4e4 | 2259 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2260 | return 0; |
0eff66e6 PM |
2261 | |
2262 | err5: | |
4538506b | 2263 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 | 2264 | err4: |
4538506b | 2265 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 | 2266 | err2: |
3cb609d5 | 2267 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2268 | err1: |
2269 | return ret; | |
1da177e4 LT |
2270 | } |
2271 | ||
65b4b4e8 | 2272 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2273 | { |
2274 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2275 | |
4538506b JE |
2276 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
2277 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); | |
3cb609d5 | 2278 | unregister_pernet_subsys(&ip6_tables_net_ops); |
1da177e4 LT |
2279 | } |
2280 | ||
2281 | EXPORT_SYMBOL(ip6t_register_table); | |
2282 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2283 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2284 | |
65b4b4e8 AM |
2285 | module_init(ip6_tables_init); |
2286 | module_exit(ip6_tables_fini); |