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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> |
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 | */ |
a81b2ce8 | 12 | |
90e7d4ab | 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
a81b2ce8 JP |
14 | |
15 | #include <linux/kernel.h> | |
4fc268d2 | 16 | #include <linux/capability.h> |
14c85021 | 17 | #include <linux/in.h> |
1da177e4 LT |
18 | #include <linux/skbuff.h> |
19 | #include <linux/kmod.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/netdevice.h> | |
22 | #include <linux/module.h> | |
4bdbf6c0 | 23 | #include <linux/poison.h> |
1da177e4 | 24 | #include <linux/icmpv6.h> |
1da177e4 | 25 | #include <net/ipv6.h> |
3bc3fe5e | 26 | #include <net/compat.h> |
1da177e4 | 27 | #include <asm/uaccess.h> |
57b47a53 | 28 | #include <linux/mutex.h> |
1da177e4 | 29 | #include <linux/proc_fs.h> |
3bc3fe5e | 30 | #include <linux/err.h> |
c8923c6b | 31 | #include <linux/cpumask.h> |
1da177e4 LT |
32 | |
33 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
2e4e6a17 | 34 | #include <linux/netfilter/x_tables.h> |
f01ffbd6 | 35 | #include <net/netfilter/nf_log.h> |
e3eaa991 | 36 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
37 | |
38 | MODULE_LICENSE("GPL"); | |
39 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
40 | MODULE_DESCRIPTION("IPv6 packet filter"); | |
41 | ||
1da177e4 LT |
42 | /*#define DEBUG_IP_FIREWALL*/ |
43 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
44 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
45 | ||
46 | #ifdef DEBUG_IP_FIREWALL | |
ff67e4e4 | 47 | #define dprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
48 | #else |
49 | #define dprintf(format, args...) | |
50 | #endif | |
51 | ||
52 | #ifdef DEBUG_IP_FIREWALL_USER | |
ff67e4e4 | 53 | #define duprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
54 | #else |
55 | #define duprintf(format, args...) | |
56 | #endif | |
57 | ||
58 | #ifdef CONFIG_NETFILTER_DEBUG | |
af567603 | 59 | #define IP_NF_ASSERT(x) WARN_ON(!(x)) |
1da177e4 LT |
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 | ||
e3eaa991 JE |
70 | void *ip6t_alloc_initial_table(const struct xt_table *info) |
71 | { | |
72 | return xt_alloc_initial_table(ip6t, IP6T); | |
73 | } | |
74 | EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table); | |
75 | ||
6b7d31fc | 76 | /* |
1da177e4 | 77 | We keep a set of rules for each CPU, so we can avoid write-locking |
6b7d31fc HW |
78 | them in the softirq when updating the counters and therefore |
79 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
80 | context stops packets coming through and allows user context to read | |
81 | the counters or update the rules. | |
1da177e4 | 82 | |
1da177e4 LT |
83 | Hence the start of any table is given by get_table() below. */ |
84 | ||
1da177e4 | 85 | /* Returns whether matches rule or not. */ |
022748a9 | 86 | /* Performance critical - called for every packet */ |
1d93a9cb | 87 | static inline bool |
1da177e4 LT |
88 | ip6_packet_match(const struct sk_buff *skb, |
89 | const char *indev, | |
90 | const char *outdev, | |
91 | const struct ip6t_ip6 *ip6info, | |
92 | unsigned int *protoff, | |
cff533ac | 93 | int *fragoff, bool *hotdrop) |
1da177e4 | 94 | { |
1da177e4 | 95 | unsigned long ret; |
0660e03f | 96 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
1da177e4 | 97 | |
e79ec50b | 98 | #define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg))) |
1da177e4 | 99 | |
f2ffd9ee | 100 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
3666ed1c JP |
101 | &ip6info->src), IP6T_INV_SRCIP) || |
102 | FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, | |
103 | &ip6info->dst), IP6T_INV_DSTIP)) { | |
1da177e4 LT |
104 | dprintf("Source or dest mismatch.\n"); |
105 | /* | |
106 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, | |
107 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, | |
108 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); | |
109 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, | |
110 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, | |
111 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ | |
1d93a9cb | 112 | return false; |
1da177e4 LT |
113 | } |
114 | ||
b8dfe498 | 115 | ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask); |
1da177e4 LT |
116 | |
117 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { | |
118 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
119 | indev, ip6info->iniface, | |
120 | ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":""); | |
1d93a9cb | 121 | return false; |
1da177e4 LT |
122 | } |
123 | ||
b8dfe498 | 124 | ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask); |
1da177e4 LT |
125 | |
126 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { | |
127 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
128 | outdev, ip6info->outiface, | |
129 | ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":""); | |
1d93a9cb | 130 | return false; |
1da177e4 LT |
131 | } |
132 | ||
133 | /* ... might want to do something with class and flowlabel here ... */ | |
134 | ||
135 | /* look for the desired protocol header */ | |
136 | if((ip6info->flags & IP6T_F_PROTO)) { | |
b777e0ce PM |
137 | int protohdr; |
138 | unsigned short _frag_off; | |
1da177e4 | 139 | |
84018f55 | 140 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off, NULL); |
51d8b1a6 PM |
141 | if (protohdr < 0) { |
142 | if (_frag_off == 0) | |
cff533ac | 143 | *hotdrop = true; |
1d93a9cb | 144 | return false; |
51d8b1a6 | 145 | } |
b777e0ce | 146 | *fragoff = _frag_off; |
1da177e4 LT |
147 | |
148 | dprintf("Packet protocol %hi ?= %s%hi.\n", | |
1ab1457c | 149 | protohdr, |
1da177e4 LT |
150 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
151 | ip6info->proto); | |
152 | ||
b777e0ce | 153 | if (ip6info->proto == protohdr) { |
1da177e4 | 154 | if(ip6info->invflags & IP6T_INV_PROTO) { |
1d93a9cb | 155 | return false; |
1da177e4 | 156 | } |
1d93a9cb | 157 | return true; |
1da177e4 LT |
158 | } |
159 | ||
160 | /* We need match for the '-p all', too! */ | |
161 | if ((ip6info->proto != 0) && | |
162 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
1d93a9cb | 163 | return false; |
1da177e4 | 164 | } |
1d93a9cb | 165 | return true; |
1da177e4 LT |
166 | } |
167 | ||
168 | /* should be ip6 safe */ | |
022748a9 | 169 | static bool |
1da177e4 LT |
170 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
171 | { | |
172 | if (ipv6->flags & ~IP6T_F_MASK) { | |
173 | duprintf("Unknown flag bits set: %08X\n", | |
174 | ipv6->flags & ~IP6T_F_MASK); | |
ccb79bdc | 175 | return false; |
1da177e4 LT |
176 | } |
177 | if (ipv6->invflags & ~IP6T_INV_MASK) { | |
178 | duprintf("Unknown invflag bits set: %08X\n", | |
179 | ipv6->invflags & ~IP6T_INV_MASK); | |
ccb79bdc | 180 | return false; |
1da177e4 | 181 | } |
ccb79bdc | 182 | return true; |
1da177e4 LT |
183 | } |
184 | ||
185 | static unsigned int | |
4b560b44 | 186 | ip6t_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 187 | { |
e87cc472 | 188 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
189 | |
190 | return NF_DROP; | |
191 | } | |
192 | ||
1da177e4 | 193 | static inline struct ip6t_entry * |
d5d1baa1 | 194 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
195 | { |
196 | return (struct ip6t_entry *)(base + offset); | |
197 | } | |
198 | ||
ba9dda3a | 199 | /* All zeroes == unconditional rule. */ |
022748a9 | 200 | /* Mildly perf critical (only if packet tracing is on) */ |
47901dc2 | 201 | static inline bool unconditional(const struct ip6t_ip6 *ipv6) |
ba9dda3a | 202 | { |
47901dc2 | 203 | static const struct ip6t_ip6 uncond; |
ba9dda3a | 204 | |
47901dc2 | 205 | return memcmp(ipv6, &uncond, sizeof(uncond)) == 0; |
ba9dda3a JK |
206 | } |
207 | ||
87a2e70d | 208 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
209 | ip6t_get_target_c(const struct ip6t_entry *e) |
210 | { | |
211 | return ip6t_get_target((struct ip6t_entry *)e); | |
212 | } | |
213 | ||
07a93626 | 214 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
ba9dda3a | 215 | /* This cries for unification! */ |
022748a9 | 216 | static const char *const hooknames[] = { |
6e23ae2a PM |
217 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
218 | [NF_INET_LOCAL_IN] = "INPUT", | |
219 | [NF_INET_FORWARD] = "FORWARD", | |
220 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
221 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
222 | }; |
223 | ||
224 | enum nf_ip_trace_comments { | |
225 | NF_IP6_TRACE_COMMENT_RULE, | |
226 | NF_IP6_TRACE_COMMENT_RETURN, | |
227 | NF_IP6_TRACE_COMMENT_POLICY, | |
228 | }; | |
229 | ||
022748a9 | 230 | static const char *const comments[] = { |
ba9dda3a JK |
231 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
232 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
233 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
234 | }; | |
235 | ||
236 | static struct nf_loginfo trace_loginfo = { | |
237 | .type = NF_LOG_TYPE_LOG, | |
238 | .u = { | |
239 | .log = { | |
a81b2ce8 | 240 | .level = LOGLEVEL_WARNING, |
ba9dda3a JK |
241 | .logflags = NF_LOG_MASK, |
242 | }, | |
243 | }, | |
244 | }; | |
245 | ||
022748a9 | 246 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 247 | static inline int |
d5d1baa1 | 248 | get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e, |
4f2f6f23 JE |
249 | const char *hookname, const char **chainname, |
250 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 251 | { |
87a2e70d | 252 | const struct xt_standard_target *t = (void *)ip6t_get_target_c(s); |
ba9dda3a | 253 | |
243bf6e2 | 254 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
255 | /* Head of user chain: ERROR target with chainname */ |
256 | *chainname = t->target.data; | |
257 | (*rulenum) = 0; | |
258 | } else if (s == e) { | |
259 | (*rulenum)++; | |
260 | ||
3666ed1c JP |
261 | if (s->target_offset == sizeof(struct ip6t_entry) && |
262 | strcmp(t->target.u.kernel.target->name, | |
243bf6e2 | 263 | XT_STANDARD_TARGET) == 0 && |
3666ed1c JP |
264 | t->verdict < 0 && |
265 | unconditional(&s->ipv6)) { | |
ba9dda3a JK |
266 | /* Tail of chains: STANDARD target (return/policy) */ |
267 | *comment = *chainname == hookname | |
4f2f6f23 JE |
268 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
269 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
270 | } |
271 | return 1; | |
272 | } else | |
273 | (*rulenum)++; | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
d5d1baa1 | 278 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
279 | unsigned int hook, |
280 | const struct net_device *in, | |
281 | const struct net_device *out, | |
ecb6f85e | 282 | const char *tablename, |
d5d1baa1 JE |
283 | const struct xt_table_info *private, |
284 | const struct ip6t_entry *e) | |
ba9dda3a | 285 | { |
d5d1baa1 | 286 | const void *table_base; |
5452e425 | 287 | const struct ip6t_entry *root; |
4f2f6f23 | 288 | const char *hookname, *chainname, *comment; |
72b2b1dd | 289 | const struct ip6t_entry *iter; |
ba9dda3a | 290 | unsigned int rulenum = 0; |
30e0c6a6 | 291 | struct net *net = dev_net(in ? in : out); |
ba9dda3a | 292 | |
ccf5bd8c | 293 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
294 | root = get_entry(table_base, private->hook_entry[hook]); |
295 | ||
4f2f6f23 JE |
296 | hookname = chainname = hooknames[hook]; |
297 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; | |
ba9dda3a | 298 | |
72b2b1dd JE |
299 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
300 | if (get_chainname_rulenum(iter, e, hookname, | |
301 | &chainname, &comment, &rulenum) != 0) | |
302 | break; | |
ba9dda3a | 303 | |
4017a7ee PNA |
304 | nf_log_trace(net, AF_INET6, hook, skb, in, out, &trace_loginfo, |
305 | "TRACE: %s:%s:%s:%u ", | |
306 | tablename, chainname, comment, rulenum); | |
ba9dda3a JK |
307 | } |
308 | #endif | |
309 | ||
98e86403 JE |
310 | static inline __pure struct ip6t_entry * |
311 | ip6t_next_entry(const struct ip6t_entry *entry) | |
312 | { | |
313 | return (void *)entry + entry->next_offset; | |
314 | } | |
315 | ||
1da177e4 LT |
316 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
317 | unsigned int | |
3db05fea | 318 | ip6t_do_table(struct sk_buff *skb, |
1da177e4 LT |
319 | unsigned int hook, |
320 | const struct net_device *in, | |
321 | const struct net_device *out, | |
fe1cb108 | 322 | struct xt_table *table) |
1da177e4 | 323 | { |
6b7d31fc | 324 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
325 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
326 | unsigned int verdict = NF_DROP; | |
327 | const char *indev, *outdev; | |
d5d1baa1 | 328 | const void *table_base; |
f3c5c1bf JE |
329 | struct ip6t_entry *e, **jumpstack; |
330 | unsigned int *stackptr, origptr, cpu; | |
d5d1baa1 | 331 | const struct xt_table_info *private; |
de74c169 | 332 | struct xt_action_param acpar; |
7f5c6d4f | 333 | unsigned int addend; |
1da177e4 LT |
334 | |
335 | /* Initialization */ | |
336 | indev = in ? in->name : nulldevname; | |
337 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
338 | /* We handle fragments by dealing with the first fragment as |
339 | * if it was a normal packet. All other fragments are treated | |
340 | * normally, except that they will NEVER match rules that ask | |
341 | * things we don't know, ie. tcp syn flag or ports). If the | |
342 | * rule is also a fragment-specific rule, non-fragments won't | |
343 | * match it. */ | |
b4ba2611 | 344 | acpar.hotdrop = false; |
de74c169 JE |
345 | acpar.in = in; |
346 | acpar.out = out; | |
347 | acpar.family = NFPROTO_IPV6; | |
348 | acpar.hooknum = hook; | |
1da177e4 | 349 | |
1da177e4 | 350 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
78454473 | 351 | |
7f5c6d4f ED |
352 | local_bh_disable(); |
353 | addend = xt_write_recseq_begin(); | |
942e4a2b | 354 | private = table->private; |
b416c144 WD |
355 | /* |
356 | * Ensure we load private-> members after we've fetched the base | |
357 | * pointer. | |
358 | */ | |
359 | smp_read_barrier_depends(); | |
f3c5c1bf JE |
360 | cpu = smp_processor_id(); |
361 | table_base = private->entries[cpu]; | |
362 | jumpstack = (struct ip6t_entry **)private->jumpstack[cpu]; | |
7489aec8 | 363 | stackptr = per_cpu_ptr(private->stackptr, cpu); |
f3c5c1bf | 364 | origptr = *stackptr; |
78454473 | 365 | |
2e4e6a17 | 366 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 367 | |
1da177e4 | 368 | do { |
87a2e70d | 369 | const struct xt_entry_target *t; |
dcea992a | 370 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 371 | |
1da177e4 | 372 | IP_NF_ASSERT(e); |
84018f55 | 373 | acpar.thoff = 0; |
a1ff4ac8 | 374 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
b4ba2611 | 375 | &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) { |
dcea992a | 376 | no_match: |
a1ff4ac8 JE |
377 | e = ip6t_next_entry(e); |
378 | continue; | |
379 | } | |
1da177e4 | 380 | |
ef53d702 | 381 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
382 | acpar.match = ematch->u.kernel.match; |
383 | acpar.matchinfo = ematch->data; | |
384 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 385 | goto no_match; |
ef53d702 | 386 | } |
dcea992a | 387 | |
261abc8c | 388 | ADD_COUNTER(e->counters, skb->len, 1); |
1da177e4 | 389 | |
d5d1baa1 | 390 | t = ip6t_get_target_c(e); |
a1ff4ac8 | 391 | IP_NF_ASSERT(t->u.kernel.target); |
ba9dda3a | 392 | |
07a93626 | 393 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
394 | /* The packet is traced: log it */ |
395 | if (unlikely(skb->nf_trace)) | |
396 | trace_packet(skb, hook, in, out, | |
397 | table->name, private, e); | |
ba9dda3a | 398 | #endif |
a1ff4ac8 JE |
399 | /* Standard target? */ |
400 | if (!t->u.kernel.target->target) { | |
401 | int v; | |
402 | ||
87a2e70d | 403 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
404 | if (v < 0) { |
405 | /* Pop from stack? */ | |
243bf6e2 | 406 | if (v != XT_RETURN) { |
95c96174 | 407 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 408 | break; |
1da177e4 | 409 | } |
db856674 | 410 | if (*stackptr <= origptr) |
f3c5c1bf JE |
411 | e = get_entry(table_base, |
412 | private->underflow[hook]); | |
413 | else | |
414 | e = ip6t_next_entry(jumpstack[--*stackptr]); | |
a1ff4ac8 JE |
415 | continue; |
416 | } | |
3666ed1c JP |
417 | if (table_base + v != ip6t_next_entry(e) && |
418 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
f3c5c1bf JE |
419 | if (*stackptr >= private->stacksize) { |
420 | verdict = NF_DROP; | |
421 | break; | |
422 | } | |
423 | jumpstack[(*stackptr)++] = e; | |
a1ff4ac8 | 424 | } |
1da177e4 | 425 | |
a1ff4ac8 | 426 | e = get_entry(table_base, v); |
7a6b1c46 JE |
427 | continue; |
428 | } | |
429 | ||
de74c169 JE |
430 | acpar.target = t->u.kernel.target; |
431 | acpar.targinfo = t->data; | |
7eb35586 | 432 | |
de74c169 | 433 | verdict = t->u.kernel.target->target(skb, &acpar); |
243bf6e2 | 434 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
435 | e = ip6t_next_entry(e); |
436 | else | |
437 | /* Verdict */ | |
438 | break; | |
b4ba2611 | 439 | } while (!acpar.hotdrop); |
1da177e4 | 440 | |
f3c5c1bf | 441 | *stackptr = origptr; |
7f5c6d4f ED |
442 | |
443 | xt_write_recseq_end(addend); | |
444 | local_bh_enable(); | |
1da177e4 LT |
445 | |
446 | #ifdef DEBUG_ALLOW_ALL | |
447 | return NF_ACCEPT; | |
448 | #else | |
b4ba2611 | 449 | if (acpar.hotdrop) |
1da177e4 LT |
450 | return NF_DROP; |
451 | else return verdict; | |
452 | #endif | |
453 | } | |
454 | ||
1da177e4 LT |
455 | /* Figures out from what hook each rule can be called: returns 0 if |
456 | there are loops. Puts hook bitmask in comefrom. */ | |
457 | static int | |
d5d1baa1 | 458 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 459 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
460 | { |
461 | unsigned int hook; | |
462 | ||
463 | /* No recursion; use packet counter to save back ptrs (reset | |
464 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 465 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 466 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 467 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
468 | |
469 | if (!(valid_hooks & (1 << hook))) | |
470 | continue; | |
471 | ||
472 | /* Set initial back pointer. */ | |
473 | e->counters.pcnt = pos; | |
474 | ||
475 | for (;;) { | |
87a2e70d | 476 | const struct xt_standard_target *t |
d5d1baa1 | 477 | = (void *)ip6t_get_target_c(e); |
9c547959 | 478 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 479 | |
6e23ae2a | 480 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
654d0fbd | 481 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
482 | hook, pos, e->comefrom); |
483 | return 0; | |
484 | } | |
9c547959 | 485 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
486 | |
487 | /* Unconditional return/END. */ | |
3666ed1c JP |
488 | if ((e->target_offset == sizeof(struct ip6t_entry) && |
489 | (strcmp(t->target.u.user.name, | |
243bf6e2 | 490 | XT_STANDARD_TARGET) == 0) && |
3666ed1c JP |
491 | t->verdict < 0 && |
492 | unconditional(&e->ipv6)) || visited) { | |
1da177e4 LT |
493 | unsigned int oldpos, size; |
494 | ||
1f9352ae | 495 | if ((strcmp(t->target.u.user.name, |
243bf6e2 | 496 | XT_STANDARD_TARGET) == 0) && |
1f9352ae | 497 | t->verdict < -NF_MAX_VERDICT - 1) { |
74c9c0c1 DM |
498 | duprintf("mark_source_chains: bad " |
499 | "negative verdict (%i)\n", | |
500 | t->verdict); | |
501 | return 0; | |
502 | } | |
503 | ||
1da177e4 LT |
504 | /* Return: backtrack through the last |
505 | big jump. */ | |
506 | do { | |
6e23ae2a | 507 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
508 | #ifdef DEBUG_IP_FIREWALL_USER |
509 | if (e->comefrom | |
6e23ae2a | 510 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
511 | duprintf("Back unset " |
512 | "on hook %u " | |
513 | "rule %u\n", | |
514 | hook, pos); | |
515 | } | |
516 | #endif | |
517 | oldpos = pos; | |
518 | pos = e->counters.pcnt; | |
519 | e->counters.pcnt = 0; | |
520 | ||
521 | /* We're at the start. */ | |
522 | if (pos == oldpos) | |
523 | goto next; | |
524 | ||
525 | e = (struct ip6t_entry *) | |
31836064 | 526 | (entry0 + pos); |
1da177e4 LT |
527 | } while (oldpos == pos + e->next_offset); |
528 | ||
529 | /* Move along one */ | |
530 | size = e->next_offset; | |
531 | e = (struct ip6t_entry *) | |
31836064 | 532 | (entry0 + pos + size); |
1da177e4 LT |
533 | e->counters.pcnt = pos; |
534 | pos += size; | |
535 | } else { | |
536 | int newpos = t->verdict; | |
537 | ||
538 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 539 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 540 | newpos >= 0) { |
74c9c0c1 DM |
541 | if (newpos > newinfo->size - |
542 | sizeof(struct ip6t_entry)) { | |
543 | duprintf("mark_source_chains: " | |
544 | "bad verdict (%i)\n", | |
545 | newpos); | |
546 | return 0; | |
547 | } | |
1da177e4 LT |
548 | /* This a jump; chase it. */ |
549 | duprintf("Jump rule %u -> %u\n", | |
550 | pos, newpos); | |
551 | } else { | |
552 | /* ... this is a fallthru */ | |
553 | newpos = pos + e->next_offset; | |
554 | } | |
555 | e = (struct ip6t_entry *) | |
31836064 | 556 | (entry0 + newpos); |
1da177e4 LT |
557 | e->counters.pcnt = pos; |
558 | pos = newpos; | |
559 | } | |
560 | } | |
561 | next: | |
562 | duprintf("Finished chain %u\n", hook); | |
563 | } | |
564 | return 1; | |
565 | } | |
566 | ||
87a2e70d | 567 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 568 | { |
6be3d859 JE |
569 | struct xt_mtdtor_param par; |
570 | ||
f54e9367 | 571 | par.net = net; |
6be3d859 JE |
572 | par.match = m->u.kernel.match; |
573 | par.matchinfo = m->data; | |
916a917d | 574 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
575 | if (par.match->destroy != NULL) |
576 | par.match->destroy(&par); | |
577 | module_put(par.match->me); | |
1da177e4 LT |
578 | } |
579 | ||
022748a9 | 580 | static int |
d5d1baa1 | 581 | check_entry(const struct ip6t_entry *e, const char *name) |
f173c8a1 | 582 | { |
87a2e70d | 583 | const struct xt_entry_target *t; |
f173c8a1 PM |
584 | |
585 | if (!ip6_checkentry(&e->ipv6)) { | |
586 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
587 | return -EINVAL; | |
588 | } | |
589 | ||
87a2e70d | 590 | if (e->target_offset + sizeof(struct xt_entry_target) > |
f173c8a1 PM |
591 | e->next_offset) |
592 | return -EINVAL; | |
593 | ||
d5d1baa1 | 594 | t = ip6t_get_target_c(e); |
f173c8a1 PM |
595 | if (e->target_offset + t->u.target_size > e->next_offset) |
596 | return -EINVAL; | |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
87a2e70d | 601 | static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
f173c8a1 | 602 | { |
9b4fce7a | 603 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
604 | int ret; |
605 | ||
9b4fce7a JE |
606 | par->match = m->u.kernel.match; |
607 | par->matchinfo = m->data; | |
608 | ||
916a917d | 609 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 610 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
367c6790 | 611 | if (ret < 0) { |
f173c8a1 | 612 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 613 | par.match->name); |
367c6790 | 614 | return ret; |
f173c8a1 | 615 | } |
367c6790 | 616 | return 0; |
f173c8a1 PM |
617 | } |
618 | ||
022748a9 | 619 | static int |
87a2e70d | 620 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 621 | { |
6709dbbb | 622 | struct xt_match *match; |
3cdc7c95 | 623 | int ret; |
1da177e4 | 624 | |
fd0ec0e6 JE |
625 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
626 | m->u.user.revision); | |
627 | if (IS_ERR(match)) { | |
f173c8a1 | 628 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 629 | return PTR_ERR(match); |
1da177e4 LT |
630 | } |
631 | m->u.kernel.match = match; | |
1da177e4 | 632 | |
6bdb331b | 633 | ret = check_match(m, par); |
3cdc7c95 PM |
634 | if (ret) |
635 | goto err; | |
636 | ||
1da177e4 | 637 | return 0; |
3cdc7c95 PM |
638 | err: |
639 | module_put(m->u.kernel.match->me); | |
640 | return ret; | |
1da177e4 LT |
641 | } |
642 | ||
add67461 | 643 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 644 | { |
87a2e70d | 645 | struct xt_entry_target *t = ip6t_get_target(e); |
af5d6dc2 | 646 | struct xt_tgchk_param par = { |
add67461 | 647 | .net = net, |
af5d6dc2 JE |
648 | .table = name, |
649 | .entryinfo = e, | |
650 | .target = t->u.kernel.target, | |
651 | .targinfo = t->data, | |
652 | .hook_mask = e->comefrom, | |
916a917d | 653 | .family = NFPROTO_IPV6, |
af5d6dc2 | 654 | }; |
1da177e4 | 655 | int ret; |
1da177e4 | 656 | |
f173c8a1 | 657 | t = ip6t_get_target(e); |
916a917d | 658 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 659 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
367c6790 | 660 | if (ret < 0) { |
f173c8a1 PM |
661 | duprintf("ip_tables: check failed for `%s'.\n", |
662 | t->u.kernel.target->name); | |
367c6790 | 663 | return ret; |
1da177e4 | 664 | } |
367c6790 | 665 | return 0; |
f173c8a1 | 666 | } |
1da177e4 | 667 | |
022748a9 | 668 | static int |
a83d8e8d | 669 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
0559518b | 670 | unsigned int size) |
f173c8a1 | 671 | { |
87a2e70d | 672 | struct xt_entry_target *t; |
f173c8a1 PM |
673 | struct xt_target *target; |
674 | int ret; | |
675 | unsigned int j; | |
9b4fce7a | 676 | struct xt_mtchk_param mtpar; |
dcea992a | 677 | struct xt_entry_match *ematch; |
f173c8a1 PM |
678 | |
679 | ret = check_entry(e, name); | |
680 | if (ret) | |
681 | return ret; | |
590bdf7f | 682 | |
1da177e4 | 683 | j = 0; |
a83d8e8d | 684 | mtpar.net = net; |
9b4fce7a JE |
685 | mtpar.table = name; |
686 | mtpar.entryinfo = &e->ipv6; | |
687 | mtpar.hook_mask = e->comefrom; | |
916a917d | 688 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 689 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 690 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 691 | if (ret != 0) |
6bdb331b JE |
692 | goto cleanup_matches; |
693 | ++j; | |
dcea992a | 694 | } |
1da177e4 LT |
695 | |
696 | t = ip6t_get_target(e); | |
d2a7b6ba JE |
697 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
698 | t->u.user.revision); | |
699 | if (IS_ERR(target)) { | |
f173c8a1 | 700 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 701 | ret = PTR_ERR(target); |
1da177e4 LT |
702 | goto cleanup_matches; |
703 | } | |
704 | t->u.kernel.target = target; | |
6b7d31fc | 705 | |
add67461 | 706 | ret = check_target(e, net, name); |
3cdc7c95 PM |
707 | if (ret) |
708 | goto err; | |
1da177e4 | 709 | return 0; |
3cdc7c95 PM |
710 | err: |
711 | module_put(t->u.kernel.target->me); | |
1da177e4 | 712 | cleanup_matches: |
6bdb331b JE |
713 | xt_ematch_foreach(ematch, e) { |
714 | if (j-- == 0) | |
dcea992a | 715 | break; |
6bdb331b JE |
716 | cleanup_match(ematch, net); |
717 | } | |
1da177e4 LT |
718 | return ret; |
719 | } | |
720 | ||
d5d1baa1 | 721 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 | 722 | { |
87a2e70d | 723 | const struct xt_entry_target *t; |
e2fe35c1 JE |
724 | unsigned int verdict; |
725 | ||
726 | if (!unconditional(&e->ipv6)) | |
727 | return false; | |
d5d1baa1 | 728 | t = ip6t_get_target_c(e); |
e2fe35c1 JE |
729 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
730 | return false; | |
87a2e70d | 731 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
732 | verdict = -verdict - 1; |
733 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
734 | } | |
735 | ||
022748a9 | 736 | static int |
1da177e4 | 737 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 738 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
739 | const unsigned char *base, |
740 | const unsigned char *limit, | |
1da177e4 LT |
741 | const unsigned int *hook_entries, |
742 | const unsigned int *underflows, | |
0559518b | 743 | unsigned int valid_hooks) |
1da177e4 LT |
744 | { |
745 | unsigned int h; | |
746 | ||
3666ed1c JP |
747 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
748 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
1da177e4 LT |
749 | duprintf("Bad offset %p\n", e); |
750 | return -EINVAL; | |
751 | } | |
752 | ||
753 | if (e->next_offset | |
87a2e70d | 754 | < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) { |
1da177e4 LT |
755 | duprintf("checking: element %p size %u\n", |
756 | e, e->next_offset); | |
757 | return -EINVAL; | |
758 | } | |
759 | ||
760 | /* Check hooks & underflows */ | |
6e23ae2a | 761 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
762 | if (!(valid_hooks & (1 << h))) |
763 | continue; | |
1da177e4 LT |
764 | if ((unsigned char *)e - base == hook_entries[h]) |
765 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 766 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
767 | if (!check_underflow(e)) { |
768 | pr_err("Underflows must be unconditional and " | |
769 | "use the STANDARD target with " | |
770 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
771 | return -EINVAL; |
772 | } | |
1da177e4 | 773 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 774 | } |
1da177e4 LT |
775 | } |
776 | ||
1da177e4 | 777 | /* Clear counters and comefrom */ |
2e4e6a17 | 778 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 779 | e->comefrom = 0; |
1da177e4 LT |
780 | return 0; |
781 | } | |
782 | ||
0559518b | 783 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
1da177e4 | 784 | { |
a2df1648 | 785 | struct xt_tgdtor_param par; |
87a2e70d | 786 | struct xt_entry_target *t; |
dcea992a | 787 | struct xt_entry_match *ematch; |
1da177e4 | 788 | |
1da177e4 | 789 | /* Cleanup all matches */ |
dcea992a | 790 | xt_ematch_foreach(ematch, e) |
6bdb331b | 791 | cleanup_match(ematch, net); |
1da177e4 | 792 | t = ip6t_get_target(e); |
a2df1648 | 793 | |
add67461 | 794 | par.net = net; |
a2df1648 JE |
795 | par.target = t->u.kernel.target; |
796 | par.targinfo = t->data; | |
916a917d | 797 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
798 | if (par.target->destroy != NULL) |
799 | par.target->destroy(&par); | |
800 | module_put(par.target->me); | |
1da177e4 LT |
801 | } |
802 | ||
803 | /* Checks and translates the user-supplied table segment (held in | |
804 | newinfo) */ | |
805 | static int | |
0f234214 JE |
806 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
807 | const struct ip6t_replace *repl) | |
1da177e4 | 808 | { |
72b2b1dd | 809 | struct ip6t_entry *iter; |
1da177e4 | 810 | unsigned int i; |
72b2b1dd | 811 | int ret = 0; |
1da177e4 | 812 | |
0f234214 JE |
813 | newinfo->size = repl->size; |
814 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
815 | |
816 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 817 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
818 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
819 | newinfo->underflow[i] = 0xFFFFFFFF; | |
820 | } | |
821 | ||
822 | duprintf("translate_table: size %u\n", newinfo->size); | |
823 | i = 0; | |
824 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
825 | xt_entry_foreach(iter, entry0, newinfo->size) { |
826 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
827 | entry0 + repl->size, |
828 | repl->hook_entry, | |
829 | repl->underflow, | |
830 | repl->valid_hooks); | |
72b2b1dd | 831 | if (ret != 0) |
0559518b JE |
832 | return ret; |
833 | ++i; | |
f3c5c1bf JE |
834 | if (strcmp(ip6t_get_target(iter)->u.user.name, |
835 | XT_ERROR_TARGET) == 0) | |
836 | ++newinfo->stacksize; | |
72b2b1dd | 837 | } |
1da177e4 | 838 | |
0f234214 | 839 | if (i != repl->num_entries) { |
1da177e4 | 840 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 841 | i, repl->num_entries); |
1da177e4 LT |
842 | return -EINVAL; |
843 | } | |
844 | ||
845 | /* Check hooks all assigned */ | |
6e23ae2a | 846 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 847 | /* Only hooks which are valid */ |
0f234214 | 848 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
849 | continue; |
850 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
851 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 852 | i, repl->hook_entry[i]); |
1da177e4 LT |
853 | return -EINVAL; |
854 | } | |
855 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
856 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 857 | i, repl->underflow[i]); |
1da177e4 LT |
858 | return -EINVAL; |
859 | } | |
860 | } | |
861 | ||
0f234214 | 862 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
863 | return -ELOOP; |
864 | ||
1da177e4 LT |
865 | /* Finally, each sanity check must pass */ |
866 | i = 0; | |
72b2b1dd | 867 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 868 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
869 | if (ret != 0) |
870 | break; | |
0559518b | 871 | ++i; |
72b2b1dd | 872 | } |
1da177e4 | 873 | |
74c9c0c1 | 874 | if (ret != 0) { |
0559518b JE |
875 | xt_entry_foreach(iter, entry0, newinfo->size) { |
876 | if (i-- == 0) | |
72b2b1dd | 877 | break; |
0559518b JE |
878 | cleanup_entry(iter, net); |
879 | } | |
74c9c0c1 DM |
880 | return ret; |
881 | } | |
1da177e4 LT |
882 | |
883 | /* And one copy for every other CPU */ | |
6f912042 | 884 | for_each_possible_cpu(i) { |
31836064 ED |
885 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
886 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
887 | } |
888 | ||
9c547959 | 889 | return ret; |
1da177e4 LT |
890 | } |
891 | ||
1da177e4 | 892 | static void |
2e4e6a17 HW |
893 | get_counters(const struct xt_table_info *t, |
894 | struct xt_counters counters[]) | |
1da177e4 | 895 | { |
72b2b1dd | 896 | struct ip6t_entry *iter; |
1da177e4 LT |
897 | unsigned int cpu; |
898 | unsigned int i; | |
899 | ||
6f912042 | 900 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 901 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 902 | |
1da177e4 | 903 | i = 0; |
0559518b | 904 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
83723d60 ED |
905 | u64 bcnt, pcnt; |
906 | unsigned int start; | |
907 | ||
908 | do { | |
7f5c6d4f | 909 | start = read_seqcount_begin(s); |
83723d60 ED |
910 | bcnt = iter->counters.bcnt; |
911 | pcnt = iter->counters.pcnt; | |
7f5c6d4f | 912 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
913 | |
914 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
915 | ++i; |
916 | } | |
1da177e4 | 917 | } |
78454473 SH |
918 | } |
919 | ||
d5d1baa1 | 920 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 921 | { |
ed1a6f5e | 922 | unsigned int countersize; |
2e4e6a17 | 923 | struct xt_counters *counters; |
d5d1baa1 | 924 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
925 | |
926 | /* We need atomic snapshot of counters: rest doesn't change | |
927 | (other than comefrom, which userspace doesn't care | |
928 | about). */ | |
2e4e6a17 | 929 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 930 | counters = vzalloc(countersize); |
1da177e4 LT |
931 | |
932 | if (counters == NULL) | |
942e4a2b | 933 | return ERR_PTR(-ENOMEM); |
78454473 | 934 | |
942e4a2b | 935 | get_counters(private, counters); |
78454473 | 936 | |
49a88d18 | 937 | return counters; |
ed1a6f5e PM |
938 | } |
939 | ||
940 | static int | |
941 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 942 | const struct xt_table *table, |
ed1a6f5e PM |
943 | void __user *userptr) |
944 | { | |
945 | unsigned int off, num; | |
d5d1baa1 | 946 | const struct ip6t_entry *e; |
ed1a6f5e | 947 | struct xt_counters *counters; |
5452e425 | 948 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 949 | int ret = 0; |
5452e425 | 950 | const void *loc_cpu_entry; |
ed1a6f5e PM |
951 | |
952 | counters = alloc_counters(table); | |
953 | if (IS_ERR(counters)) | |
954 | return PTR_ERR(counters); | |
955 | ||
9c547959 PM |
956 | /* choose the copy that is on our node/cpu, ... |
957 | * This choice is lazy (because current thread is | |
958 | * allowed to migrate to another cpu) | |
959 | */ | |
2e4e6a17 | 960 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 961 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
962 | ret = -EFAULT; |
963 | goto free_counters; | |
964 | } | |
965 | ||
966 | /* FIXME: use iterator macros --RR */ | |
967 | /* ... then go back and fix counters and names */ | |
968 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
969 | unsigned int i; | |
87a2e70d JE |
970 | const struct xt_entry_match *m; |
971 | const struct xt_entry_target *t; | |
1da177e4 | 972 | |
31836064 | 973 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
974 | if (copy_to_user(userptr + off |
975 | + offsetof(struct ip6t_entry, counters), | |
976 | &counters[num], | |
977 | sizeof(counters[num])) != 0) { | |
978 | ret = -EFAULT; | |
979 | goto free_counters; | |
980 | } | |
981 | ||
982 | for (i = sizeof(struct ip6t_entry); | |
983 | i < e->target_offset; | |
984 | i += m->u.match_size) { | |
985 | m = (void *)e + i; | |
986 | ||
987 | if (copy_to_user(userptr + off + i | |
87a2e70d | 988 | + offsetof(struct xt_entry_match, |
1da177e4 LT |
989 | u.user.name), |
990 | m->u.kernel.match->name, | |
991 | strlen(m->u.kernel.match->name)+1) | |
992 | != 0) { | |
993 | ret = -EFAULT; | |
994 | goto free_counters; | |
995 | } | |
996 | } | |
997 | ||
d5d1baa1 | 998 | t = ip6t_get_target_c(e); |
1da177e4 | 999 | if (copy_to_user(userptr + off + e->target_offset |
87a2e70d | 1000 | + offsetof(struct xt_entry_target, |
1da177e4 LT |
1001 | u.user.name), |
1002 | t->u.kernel.target->name, | |
1003 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1004 | ret = -EFAULT; | |
1005 | goto free_counters; | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | free_counters: | |
1010 | vfree(counters); | |
1011 | return ret; | |
1012 | } | |
1013 | ||
3bc3fe5e | 1014 | #ifdef CONFIG_COMPAT |
739674fb | 1015 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
1016 | { |
1017 | int v = *(compat_int_t *)src; | |
1018 | ||
1019 | if (v > 0) | |
1020 | v += xt_compat_calc_jump(AF_INET6, v); | |
1021 | memcpy(dst, &v, sizeof(v)); | |
1022 | } | |
1023 | ||
739674fb | 1024 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
1025 | { |
1026 | compat_int_t cv = *(int *)src; | |
1027 | ||
1028 | if (cv > 0) | |
1029 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1030 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1031 | } | |
1032 | ||
d5d1baa1 | 1033 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 1034 | const struct xt_table_info *info, |
d5d1baa1 | 1035 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 1036 | { |
dcea992a | 1037 | const struct xt_entry_match *ematch; |
87a2e70d | 1038 | const struct xt_entry_target *t; |
3bc3fe5e PM |
1039 | unsigned int entry_offset; |
1040 | int off, i, ret; | |
1041 | ||
1042 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1043 | entry_offset = (void *)e - base; | |
dcea992a | 1044 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1045 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1046 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
1047 | off += xt_compat_target_offset(t->u.kernel.target); |
1048 | newinfo->size -= off; | |
1049 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1050 | if (ret) | |
1051 | return ret; | |
1052 | ||
1053 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1054 | if (info->hook_entry[i] && | |
1055 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1056 | newinfo->hook_entry[i] -= off; | |
1057 | if (info->underflow[i] && | |
1058 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1059 | newinfo->underflow[i] -= off; | |
1060 | } | |
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | static int compat_table_info(const struct xt_table_info *info, | |
1065 | struct xt_table_info *newinfo) | |
1066 | { | |
72b2b1dd | 1067 | struct ip6t_entry *iter; |
3bc3fe5e | 1068 | void *loc_cpu_entry; |
0559518b | 1069 | int ret; |
3bc3fe5e PM |
1070 | |
1071 | if (!newinfo || !info) | |
1072 | return -EINVAL; | |
1073 | ||
1074 | /* we dont care about newinfo->entries[] */ | |
1075 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1076 | newinfo->initial_entries = 0; | |
1077 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
255d0dc3 | 1078 | xt_compat_init_offsets(AF_INET6, info->number); |
72b2b1dd JE |
1079 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1080 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1081 | if (ret != 0) | |
0559518b | 1082 | return ret; |
72b2b1dd | 1083 | } |
0559518b | 1084 | return 0; |
3bc3fe5e PM |
1085 | } |
1086 | #endif | |
1087 | ||
d5d1baa1 JE |
1088 | static int get_info(struct net *net, void __user *user, |
1089 | const int *len, int compat) | |
433665c9 | 1090 | { |
12b00c2c | 1091 | char name[XT_TABLE_MAXNAMELEN]; |
433665c9 PM |
1092 | struct xt_table *t; |
1093 | int ret; | |
1094 | ||
1095 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1096 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1097 | sizeof(struct ip6t_getinfo)); |
1098 | return -EINVAL; | |
1099 | } | |
1100 | ||
1101 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1102 | return -EFAULT; | |
1103 | ||
12b00c2c | 1104 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
3bc3fe5e PM |
1105 | #ifdef CONFIG_COMPAT |
1106 | if (compat) | |
1107 | xt_compat_lock(AF_INET6); | |
1108 | #endif | |
336b517f | 1109 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 | 1110 | "ip6table_%s", name); |
0cc8d8df | 1111 | if (!IS_ERR_OR_NULL(t)) { |
433665c9 | 1112 | struct ip6t_getinfo info; |
5452e425 | 1113 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1114 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1115 | struct xt_table_info tmp; |
1116 | ||
3bc3fe5e | 1117 | if (compat) { |
3bc3fe5e PM |
1118 | ret = compat_table_info(private, &tmp); |
1119 | xt_compat_flush_offsets(AF_INET6); | |
1120 | private = &tmp; | |
1121 | } | |
1122 | #endif | |
cccbe5ef | 1123 | memset(&info, 0, sizeof(info)); |
433665c9 PM |
1124 | info.valid_hooks = t->valid_hooks; |
1125 | memcpy(info.hook_entry, private->hook_entry, | |
1126 | sizeof(info.hook_entry)); | |
1127 | memcpy(info.underflow, private->underflow, | |
1128 | sizeof(info.underflow)); | |
1129 | info.num_entries = private->number; | |
1130 | info.size = private->size; | |
b5dd674b | 1131 | strcpy(info.name, name); |
433665c9 PM |
1132 | |
1133 | if (copy_to_user(user, &info, *len) != 0) | |
1134 | ret = -EFAULT; | |
1135 | else | |
1136 | ret = 0; | |
1137 | ||
1138 | xt_table_unlock(t); | |
1139 | module_put(t->me); | |
1140 | } else | |
1141 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1142 | #ifdef CONFIG_COMPAT |
1143 | if (compat) | |
1144 | xt_compat_unlock(AF_INET6); | |
1145 | #endif | |
433665c9 PM |
1146 | return ret; |
1147 | } | |
1148 | ||
1da177e4 | 1149 | static int |
d5d1baa1 JE |
1150 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
1151 | const int *len) | |
1da177e4 LT |
1152 | { |
1153 | int ret; | |
d924357c | 1154 | struct ip6t_get_entries get; |
2e4e6a17 | 1155 | struct xt_table *t; |
1da177e4 | 1156 | |
d924357c | 1157 | if (*len < sizeof(get)) { |
c9d8fe13 | 1158 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1159 | return -EINVAL; |
1160 | } | |
1161 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1162 | return -EFAULT; | |
1163 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1164 | duprintf("get_entries: %u != %zu\n", |
1165 | *len, sizeof(get) + get.size); | |
d924357c PM |
1166 | return -EINVAL; |
1167 | } | |
1168 | ||
336b517f | 1169 | t = xt_find_table_lock(net, AF_INET6, get.name); |
0cc8d8df | 1170 | if (!IS_ERR_OR_NULL(t)) { |
2e4e6a17 HW |
1171 | struct xt_table_info *private = t->private; |
1172 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1173 | if (get.size == private->size) |
2e4e6a17 | 1174 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1175 | t, uptr->entrytable); |
1176 | else { | |
1177 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1178 | private->size, get.size); |
544473c1 | 1179 | ret = -EAGAIN; |
1da177e4 | 1180 | } |
6b7d31fc | 1181 | module_put(t->me); |
2e4e6a17 | 1182 | xt_table_unlock(t); |
1da177e4 | 1183 | } else |
6b7d31fc | 1184 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1185 | |
1186 | return ret; | |
1187 | } | |
1188 | ||
1189 | static int | |
336b517f | 1190 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1191 | struct xt_table_info *newinfo, unsigned int num_counters, |
1192 | void __user *counters_ptr) | |
1da177e4 LT |
1193 | { |
1194 | int ret; | |
2e4e6a17 | 1195 | struct xt_table *t; |
3bc3fe5e | 1196 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1197 | struct xt_counters *counters; |
5452e425 | 1198 | const void *loc_cpu_old_entry; |
72b2b1dd | 1199 | struct ip6t_entry *iter; |
1da177e4 | 1200 | |
3bc3fe5e | 1201 | ret = 0; |
83723d60 | 1202 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
1da177e4 LT |
1203 | if (!counters) { |
1204 | ret = -ENOMEM; | |
3bc3fe5e | 1205 | goto out; |
1da177e4 | 1206 | } |
1da177e4 | 1207 | |
336b517f | 1208 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1209 | "ip6table_%s", name); |
0cc8d8df | 1210 | if (IS_ERR_OR_NULL(t)) { |
6b7d31fc | 1211 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1212 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1213 | } |
1da177e4 LT |
1214 | |
1215 | /* You lied! */ | |
3bc3fe5e | 1216 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1217 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1218 | valid_hooks, t->valid_hooks); |
1da177e4 | 1219 | ret = -EINVAL; |
6b7d31fc | 1220 | goto put_module; |
1da177e4 LT |
1221 | } |
1222 | ||
3bc3fe5e | 1223 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1224 | if (!oldinfo) |
1225 | goto put_module; | |
1226 | ||
1227 | /* Update module usage count based on number of rules */ | |
1228 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1229 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1230 | if ((oldinfo->number > oldinfo->initial_entries) || |
1231 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1232 | module_put(t->me); |
1233 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1234 | (newinfo->number <= oldinfo->initial_entries)) | |
1235 | module_put(t->me); | |
1236 | ||
942e4a2b | 1237 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1238 | get_counters(oldinfo, counters); |
942e4a2b | 1239 | |
1da177e4 | 1240 | /* Decrease module usage counts and free resource */ |
31836064 | 1241 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
72b2b1dd | 1242 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1243 | cleanup_entry(iter, net); |
72b2b1dd | 1244 | |
2e4e6a17 | 1245 | xt_free_table_info(oldinfo); |
3bc3fe5e | 1246 | if (copy_to_user(counters_ptr, counters, |
c58dd2dd TG |
1247 | sizeof(struct xt_counters) * num_counters) != 0) { |
1248 | /* Silent error, can't fail, new table is already in place */ | |
1249 | net_warn_ratelimited("ip6tables: counters copy to user failed while replacing table\n"); | |
1250 | } | |
1da177e4 | 1251 | vfree(counters); |
2e4e6a17 | 1252 | xt_table_unlock(t); |
1da177e4 LT |
1253 | return ret; |
1254 | ||
1255 | put_module: | |
1256 | module_put(t->me); | |
2e4e6a17 | 1257 | xt_table_unlock(t); |
1da177e4 | 1258 | free_newinfo_counters_untrans: |
1da177e4 | 1259 | vfree(counters); |
3bc3fe5e PM |
1260 | out: |
1261 | return ret; | |
1262 | } | |
1263 | ||
1264 | static int | |
d5d1baa1 | 1265 | do_replace(struct net *net, const void __user *user, unsigned int len) |
3bc3fe5e PM |
1266 | { |
1267 | int ret; | |
1268 | struct ip6t_replace tmp; | |
1269 | struct xt_table_info *newinfo; | |
1270 | void *loc_cpu_entry; | |
72b2b1dd | 1271 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1272 | |
1273 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1274 | return -EFAULT; | |
1275 | ||
1276 | /* overflow check */ | |
1277 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1278 | return -ENOMEM; | |
6a8ab060 | 1279 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1280 | |
1281 | newinfo = xt_alloc_table_info(tmp.size); | |
1282 | if (!newinfo) | |
1283 | return -ENOMEM; | |
1284 | ||
1285 | /* choose the copy that is on our node/cpu */ | |
1286 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1287 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1288 | tmp.size) != 0) { | |
1289 | ret = -EFAULT; | |
1290 | goto free_newinfo; | |
1291 | } | |
1292 | ||
0f234214 | 1293 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1294 | if (ret != 0) |
1295 | goto free_newinfo; | |
1296 | ||
1297 | duprintf("ip_tables: Translated table\n"); | |
1298 | ||
336b517f | 1299 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1300 | tmp.num_counters, tmp.counters); |
1301 | if (ret) | |
1302 | goto free_newinfo_untrans; | |
1303 | return 0; | |
1304 | ||
1305 | free_newinfo_untrans: | |
72b2b1dd | 1306 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1307 | cleanup_entry(iter, net); |
1da177e4 | 1308 | free_newinfo: |
2e4e6a17 | 1309 | xt_free_table_info(newinfo); |
1da177e4 LT |
1310 | return ret; |
1311 | } | |
1312 | ||
1da177e4 | 1313 | static int |
d5d1baa1 | 1314 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
336b517f | 1315 | int compat) |
1da177e4 | 1316 | { |
942e4a2b | 1317 | unsigned int i, curcpu; |
3bc3fe5e PM |
1318 | struct xt_counters_info tmp; |
1319 | struct xt_counters *paddc; | |
1320 | unsigned int num_counters; | |
1321 | char *name; | |
1322 | int size; | |
1323 | void *ptmp; | |
2e4e6a17 | 1324 | struct xt_table *t; |
5452e425 | 1325 | const struct xt_table_info *private; |
6b7d31fc | 1326 | int ret = 0; |
5452e425 | 1327 | const void *loc_cpu_entry; |
72b2b1dd | 1328 | struct ip6t_entry *iter; |
7f5c6d4f | 1329 | unsigned int addend; |
3bc3fe5e PM |
1330 | #ifdef CONFIG_COMPAT |
1331 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1332 | |
3bc3fe5e PM |
1333 | if (compat) { |
1334 | ptmp = &compat_tmp; | |
1335 | size = sizeof(struct compat_xt_counters_info); | |
1336 | } else | |
1337 | #endif | |
1338 | { | |
1339 | ptmp = &tmp; | |
1340 | size = sizeof(struct xt_counters_info); | |
1341 | } | |
1342 | ||
1343 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1344 | return -EFAULT; |
1345 | ||
3bc3fe5e PM |
1346 | #ifdef CONFIG_COMPAT |
1347 | if (compat) { | |
1348 | num_counters = compat_tmp.num_counters; | |
1349 | name = compat_tmp.name; | |
1350 | } else | |
1351 | #endif | |
1352 | { | |
1353 | num_counters = tmp.num_counters; | |
1354 | name = tmp.name; | |
1355 | } | |
1356 | ||
1357 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1358 | return -EINVAL; |
1359 | ||
e12f8e29 | 1360 | paddc = vmalloc(len - size); |
1da177e4 LT |
1361 | if (!paddc) |
1362 | return -ENOMEM; | |
1363 | ||
3bc3fe5e | 1364 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1365 | ret = -EFAULT; |
1366 | goto free; | |
1367 | } | |
1368 | ||
336b517f | 1369 | t = xt_find_table_lock(net, AF_INET6, name); |
0cc8d8df | 1370 | if (IS_ERR_OR_NULL(t)) { |
6b7d31fc | 1371 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1372 | goto free; |
6b7d31fc | 1373 | } |
1da177e4 | 1374 | |
942e4a2b SH |
1375 | |
1376 | local_bh_disable(); | |
2e4e6a17 | 1377 | private = t->private; |
3bc3fe5e | 1378 | if (private->number != num_counters) { |
1da177e4 LT |
1379 | ret = -EINVAL; |
1380 | goto unlock_up_free; | |
1381 | } | |
1382 | ||
1383 | i = 0; | |
31836064 | 1384 | /* Choose the copy that is on our node */ |
942e4a2b | 1385 | curcpu = smp_processor_id(); |
7f5c6d4f | 1386 | addend = xt_write_recseq_begin(); |
942e4a2b | 1387 | loc_cpu_entry = private->entries[curcpu]; |
0559518b JE |
1388 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1389 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1390 | ++i; | |
1391 | } | |
7f5c6d4f | 1392 | xt_write_recseq_end(addend); |
942e4a2b | 1393 | |
1da177e4 | 1394 | unlock_up_free: |
942e4a2b | 1395 | local_bh_enable(); |
2e4e6a17 | 1396 | xt_table_unlock(t); |
6b7d31fc | 1397 | module_put(t->me); |
1da177e4 LT |
1398 | free: |
1399 | vfree(paddc); | |
1400 | ||
1401 | return ret; | |
1402 | } | |
1403 | ||
3bc3fe5e PM |
1404 | #ifdef CONFIG_COMPAT |
1405 | struct compat_ip6t_replace { | |
12b00c2c | 1406 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1407 | u32 valid_hooks; |
1408 | u32 num_entries; | |
1409 | u32 size; | |
1410 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1411 | u32 underflow[NF_INET_NUMHOOKS]; | |
1412 | u32 num_counters; | |
87a2e70d | 1413 | compat_uptr_t counters; /* struct xt_counters * */ |
3bc3fe5e PM |
1414 | struct compat_ip6t_entry entries[0]; |
1415 | }; | |
1416 | ||
1417 | static int | |
1418 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1419 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1420 | unsigned int i) |
3bc3fe5e | 1421 | { |
87a2e70d | 1422 | struct xt_entry_target *t; |
3bc3fe5e PM |
1423 | struct compat_ip6t_entry __user *ce; |
1424 | u_int16_t target_offset, next_offset; | |
1425 | compat_uint_t origsize; | |
dcea992a JE |
1426 | const struct xt_entry_match *ematch; |
1427 | int ret = 0; | |
3bc3fe5e | 1428 | |
3bc3fe5e PM |
1429 | origsize = *size; |
1430 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
0559518b JE |
1431 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1432 | copy_to_user(&ce->counters, &counters[i], | |
1433 | sizeof(counters[i])) != 0) | |
1434 | return -EFAULT; | |
3bc3fe5e PM |
1435 | |
1436 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1437 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1438 | ||
dcea992a JE |
1439 | xt_ematch_foreach(ematch, e) { |
1440 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1441 | if (ret != 0) | |
6bdb331b | 1442 | return ret; |
dcea992a | 1443 | } |
3bc3fe5e | 1444 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1445 | t = ip6t_get_target(e); |
1446 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1447 | if (ret) | |
0559518b | 1448 | return ret; |
3bc3fe5e | 1449 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1450 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1451 | put_user(next_offset, &ce->next_offset) != 0) | |
1452 | return -EFAULT; | |
3bc3fe5e | 1453 | return 0; |
3bc3fe5e PM |
1454 | } |
1455 | ||
022748a9 | 1456 | static int |
87a2e70d | 1457 | compat_find_calc_match(struct xt_entry_match *m, |
3bc3fe5e PM |
1458 | const char *name, |
1459 | const struct ip6t_ip6 *ipv6, | |
1460 | unsigned int hookmask, | |
6bdb331b | 1461 | int *size) |
3bc3fe5e PM |
1462 | { |
1463 | struct xt_match *match; | |
1464 | ||
fd0ec0e6 JE |
1465 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
1466 | m->u.user.revision); | |
1467 | if (IS_ERR(match)) { | |
3bc3fe5e PM |
1468 | duprintf("compat_check_calc_match: `%s' not found\n", |
1469 | m->u.user.name); | |
fd0ec0e6 | 1470 | return PTR_ERR(match); |
3bc3fe5e PM |
1471 | } |
1472 | m->u.kernel.match = match; | |
1473 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1474 | return 0; |
1475 | } | |
1476 | ||
0559518b | 1477 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e | 1478 | { |
87a2e70d | 1479 | struct xt_entry_target *t; |
dcea992a | 1480 | struct xt_entry_match *ematch; |
3bc3fe5e | 1481 | |
3bc3fe5e | 1482 | /* Cleanup all matches */ |
dcea992a | 1483 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1484 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1485 | t = compat_ip6t_get_target(e); |
1486 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1487 | } |
1488 | ||
022748a9 | 1489 | static int |
3bc3fe5e PM |
1490 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1491 | struct xt_table_info *newinfo, | |
1492 | unsigned int *size, | |
d5d1baa1 JE |
1493 | const unsigned char *base, |
1494 | const unsigned char *limit, | |
1495 | const unsigned int *hook_entries, | |
1496 | const unsigned int *underflows, | |
3bc3fe5e PM |
1497 | const char *name) |
1498 | { | |
dcea992a | 1499 | struct xt_entry_match *ematch; |
87a2e70d | 1500 | struct xt_entry_target *t; |
3bc3fe5e PM |
1501 | struct xt_target *target; |
1502 | unsigned int entry_offset; | |
b0a6363c PM |
1503 | unsigned int j; |
1504 | int ret, off, h; | |
3bc3fe5e PM |
1505 | |
1506 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1507 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
1508 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
3bc3fe5e PM |
1509 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1510 | return -EINVAL; | |
1511 | } | |
1512 | ||
1513 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1514 | sizeof(struct compat_xt_entry_target)) { | |
1515 | duprintf("checking: element %p size %u\n", | |
1516 | e, e->next_offset); | |
1517 | return -EINVAL; | |
1518 | } | |
1519 | ||
1520 | /* For purposes of check_entry casting the compat entry is fine */ | |
1521 | ret = check_entry((struct ip6t_entry *)e, name); | |
1522 | if (ret) | |
1523 | return ret; | |
1524 | ||
1525 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1526 | entry_offset = (void *)e - (void *)base; | |
1527 | j = 0; | |
dcea992a JE |
1528 | xt_ematch_foreach(ematch, e) { |
1529 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1530 | &e->ipv6, e->comefrom, &off); |
dcea992a | 1531 | if (ret != 0) |
6bdb331b JE |
1532 | goto release_matches; |
1533 | ++j; | |
dcea992a | 1534 | } |
3bc3fe5e PM |
1535 | |
1536 | t = compat_ip6t_get_target(e); | |
d2a7b6ba JE |
1537 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
1538 | t->u.user.revision); | |
1539 | if (IS_ERR(target)) { | |
3bc3fe5e PM |
1540 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
1541 | t->u.user.name); | |
d2a7b6ba | 1542 | ret = PTR_ERR(target); |
3bc3fe5e PM |
1543 | goto release_matches; |
1544 | } | |
1545 | t->u.kernel.target = target; | |
1546 | ||
1547 | off += xt_compat_target_offset(target); | |
1548 | *size += off; | |
1549 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1550 | if (ret) | |
1551 | goto out; | |
1552 | ||
1553 | /* Check hooks & underflows */ | |
1554 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1555 | if ((unsigned char *)e - base == hook_entries[h]) | |
1556 | newinfo->hook_entry[h] = hook_entries[h]; | |
1557 | if ((unsigned char *)e - base == underflows[h]) | |
1558 | newinfo->underflow[h] = underflows[h]; | |
1559 | } | |
1560 | ||
1561 | /* Clear counters and comefrom */ | |
1562 | memset(&e->counters, 0, sizeof(e->counters)); | |
1563 | e->comefrom = 0; | |
3bc3fe5e PM |
1564 | return 0; |
1565 | ||
1566 | out: | |
1567 | module_put(t->u.kernel.target->me); | |
1568 | release_matches: | |
6bdb331b JE |
1569 | xt_ematch_foreach(ematch, e) { |
1570 | if (j-- == 0) | |
dcea992a | 1571 | break; |
6bdb331b JE |
1572 | module_put(ematch->u.kernel.match->me); |
1573 | } | |
3bc3fe5e PM |
1574 | return ret; |
1575 | } | |
1576 | ||
1577 | static int | |
1578 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1579 | unsigned int *size, const char *name, | |
1580 | struct xt_table_info *newinfo, unsigned char *base) | |
1581 | { | |
87a2e70d | 1582 | struct xt_entry_target *t; |
3bc3fe5e PM |
1583 | struct ip6t_entry *de; |
1584 | unsigned int origsize; | |
1585 | int ret, h; | |
dcea992a | 1586 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1587 | |
1588 | ret = 0; | |
1589 | origsize = *size; | |
1590 | de = (struct ip6t_entry *)*dstptr; | |
1591 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1592 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1593 | ||
1594 | *dstptr += sizeof(struct ip6t_entry); | |
1595 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1596 | ||
dcea992a JE |
1597 | xt_ematch_foreach(ematch, e) { |
1598 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1599 | if (ret != 0) | |
6bdb331b | 1600 | return ret; |
dcea992a | 1601 | } |
3bc3fe5e PM |
1602 | de->target_offset = e->target_offset - (origsize - *size); |
1603 | t = compat_ip6t_get_target(e); | |
3bc3fe5e PM |
1604 | xt_compat_target_from_user(t, dstptr, size); |
1605 | ||
1606 | de->next_offset = e->next_offset - (origsize - *size); | |
1607 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1608 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1609 | newinfo->hook_entry[h] -= origsize - *size; | |
1610 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1611 | newinfo->underflow[h] -= origsize - *size; | |
1612 | } | |
1613 | return ret; | |
1614 | } | |
1615 | ||
f54e9367 | 1616 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
0559518b | 1617 | const char *name) |
3bc3fe5e | 1618 | { |
b0a6363c | 1619 | unsigned int j; |
dcea992a | 1620 | int ret = 0; |
9b4fce7a | 1621 | struct xt_mtchk_param mtpar; |
dcea992a | 1622 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1623 | |
1624 | j = 0; | |
f54e9367 | 1625 | mtpar.net = net; |
9b4fce7a JE |
1626 | mtpar.table = name; |
1627 | mtpar.entryinfo = &e->ipv6; | |
1628 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1629 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 1630 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1631 | ret = check_match(ematch, &mtpar); |
dcea992a | 1632 | if (ret != 0) |
6bdb331b JE |
1633 | goto cleanup_matches; |
1634 | ++j; | |
dcea992a | 1635 | } |
3bc3fe5e | 1636 | |
add67461 | 1637 | ret = check_target(e, net, name); |
3bc3fe5e PM |
1638 | if (ret) |
1639 | goto cleanup_matches; | |
3bc3fe5e PM |
1640 | return 0; |
1641 | ||
1642 | cleanup_matches: | |
6bdb331b JE |
1643 | xt_ematch_foreach(ematch, e) { |
1644 | if (j-- == 0) | |
dcea992a | 1645 | break; |
6bdb331b JE |
1646 | cleanup_match(ematch, net); |
1647 | } | |
3bc3fe5e PM |
1648 | return ret; |
1649 | } | |
1650 | ||
1651 | static int | |
f54e9367 AD |
1652 | translate_compat_table(struct net *net, |
1653 | const char *name, | |
3bc3fe5e PM |
1654 | unsigned int valid_hooks, |
1655 | struct xt_table_info **pinfo, | |
1656 | void **pentry0, | |
1657 | unsigned int total_size, | |
1658 | unsigned int number, | |
1659 | unsigned int *hook_entries, | |
1660 | unsigned int *underflows) | |
1661 | { | |
1662 | unsigned int i, j; | |
1663 | struct xt_table_info *newinfo, *info; | |
1664 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1665 | struct compat_ip6t_entry *iter0; |
1666 | struct ip6t_entry *iter1; | |
3bc3fe5e | 1667 | unsigned int size; |
72b2b1dd | 1668 | int ret = 0; |
3bc3fe5e PM |
1669 | |
1670 | info = *pinfo; | |
1671 | entry0 = *pentry0; | |
1672 | size = total_size; | |
1673 | info->number = number; | |
1674 | ||
1675 | /* Init all hooks to impossible value. */ | |
1676 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1677 | info->hook_entry[i] = 0xFFFFFFFF; | |
1678 | info->underflow[i] = 0xFFFFFFFF; | |
1679 | } | |
1680 | ||
1681 | duprintf("translate_compat_table: size %u\n", info->size); | |
1682 | j = 0; | |
1683 | xt_compat_lock(AF_INET6); | |
255d0dc3 | 1684 | xt_compat_init_offsets(AF_INET6, number); |
3bc3fe5e | 1685 | /* Walk through entries, checking offsets. */ |
72b2b1dd JE |
1686 | xt_entry_foreach(iter0, entry0, total_size) { |
1687 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1688 | entry0, |
1689 | entry0 + total_size, | |
1690 | hook_entries, | |
1691 | underflows, | |
1692 | name); | |
72b2b1dd | 1693 | if (ret != 0) |
0559518b JE |
1694 | goto out_unlock; |
1695 | ++j; | |
72b2b1dd | 1696 | } |
3bc3fe5e PM |
1697 | |
1698 | ret = -EINVAL; | |
1699 | if (j != number) { | |
1700 | duprintf("translate_compat_table: %u not %u entries\n", | |
1701 | j, number); | |
1702 | goto out_unlock; | |
1703 | } | |
1704 | ||
1705 | /* Check hooks all assigned */ | |
1706 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1707 | /* Only hooks which are valid */ | |
1708 | if (!(valid_hooks & (1 << i))) | |
1709 | continue; | |
1710 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1711 | duprintf("Invalid hook entry %u %u\n", | |
1712 | i, hook_entries[i]); | |
1713 | goto out_unlock; | |
1714 | } | |
1715 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1716 | duprintf("Invalid underflow %u %u\n", | |
1717 | i, underflows[i]); | |
1718 | goto out_unlock; | |
1719 | } | |
1720 | } | |
1721 | ||
1722 | ret = -ENOMEM; | |
1723 | newinfo = xt_alloc_table_info(size); | |
1724 | if (!newinfo) | |
1725 | goto out_unlock; | |
1726 | ||
1727 | newinfo->number = number; | |
1728 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1729 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1730 | newinfo->underflow[i] = info->underflow[i]; | |
1731 | } | |
1732 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1733 | pos = entry1; | |
1734 | size = total_size; | |
72b2b1dd | 1735 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1736 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1737 | name, newinfo, entry1); | |
72b2b1dd JE |
1738 | if (ret != 0) |
1739 | break; | |
1740 | } | |
3bc3fe5e PM |
1741 | xt_compat_flush_offsets(AF_INET6); |
1742 | xt_compat_unlock(AF_INET6); | |
1743 | if (ret) | |
1744 | goto free_newinfo; | |
1745 | ||
1746 | ret = -ELOOP; | |
1747 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1748 | goto free_newinfo; | |
1749 | ||
1750 | i = 0; | |
72b2b1dd | 1751 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1752 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1753 | if (ret != 0) |
1754 | break; | |
0559518b | 1755 | ++i; |
cca77b7c FW |
1756 | if (strcmp(ip6t_get_target(iter1)->u.user.name, |
1757 | XT_ERROR_TARGET) == 0) | |
1758 | ++newinfo->stacksize; | |
72b2b1dd | 1759 | } |
3bc3fe5e | 1760 | if (ret) { |
72b2b1dd JE |
1761 | /* |
1762 | * The first i matches need cleanup_entry (calls ->destroy) | |
1763 | * because they had called ->check already. The other j-i | |
1764 | * entries need only release. | |
1765 | */ | |
1766 | int skip = i; | |
3bc3fe5e | 1767 | j -= i; |
72b2b1dd JE |
1768 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1769 | if (skip-- > 0) | |
1770 | continue; | |
0559518b | 1771 | if (j-- == 0) |
72b2b1dd | 1772 | break; |
0559518b | 1773 | compat_release_entry(iter0); |
72b2b1dd | 1774 | } |
0559518b JE |
1775 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1776 | if (i-- == 0) | |
72b2b1dd | 1777 | break; |
0559518b JE |
1778 | cleanup_entry(iter1, net); |
1779 | } | |
3bc3fe5e PM |
1780 | xt_free_table_info(newinfo); |
1781 | return ret; | |
1782 | } | |
1783 | ||
1784 | /* And one copy for every other CPU */ | |
1785 | for_each_possible_cpu(i) | |
1786 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1787 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1788 | ||
1789 | *pinfo = newinfo; | |
1790 | *pentry0 = entry1; | |
1791 | xt_free_table_info(info); | |
1792 | return 0; | |
1793 | ||
1794 | free_newinfo: | |
1795 | xt_free_table_info(newinfo); | |
1796 | out: | |
0559518b JE |
1797 | xt_entry_foreach(iter0, entry0, total_size) { |
1798 | if (j-- == 0) | |
72b2b1dd | 1799 | break; |
0559518b JE |
1800 | compat_release_entry(iter0); |
1801 | } | |
3bc3fe5e PM |
1802 | return ret; |
1803 | out_unlock: | |
1804 | xt_compat_flush_offsets(AF_INET6); | |
1805 | xt_compat_unlock(AF_INET6); | |
1806 | goto out; | |
1807 | } | |
1808 | ||
1809 | static int | |
336b517f | 1810 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1811 | { |
1812 | int ret; | |
1813 | struct compat_ip6t_replace tmp; | |
1814 | struct xt_table_info *newinfo; | |
1815 | void *loc_cpu_entry; | |
72b2b1dd | 1816 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1817 | |
1818 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1819 | return -EFAULT; | |
1820 | ||
1821 | /* overflow check */ | |
1822 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1823 | return -ENOMEM; | |
1824 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1825 | return -ENOMEM; | |
6a8ab060 | 1826 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1827 | |
1828 | newinfo = xt_alloc_table_info(tmp.size); | |
1829 | if (!newinfo) | |
1830 | return -ENOMEM; | |
1831 | ||
9c547959 | 1832 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1833 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1834 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1835 | tmp.size) != 0) { | |
1836 | ret = -EFAULT; | |
1837 | goto free_newinfo; | |
1838 | } | |
1839 | ||
f54e9367 | 1840 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1841 | &newinfo, &loc_cpu_entry, tmp.size, |
1842 | tmp.num_entries, tmp.hook_entry, | |
1843 | tmp.underflow); | |
1844 | if (ret != 0) | |
1845 | goto free_newinfo; | |
1846 | ||
1847 | duprintf("compat_do_replace: Translated table\n"); | |
1848 | ||
336b517f | 1849 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1850 | tmp.num_counters, compat_ptr(tmp.counters)); |
1851 | if (ret) | |
1852 | goto free_newinfo_untrans; | |
1853 | return 0; | |
1854 | ||
1855 | free_newinfo_untrans: | |
72b2b1dd | 1856 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1857 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1858 | free_newinfo: |
1859 | xt_free_table_info(newinfo); | |
1860 | return ret; | |
1861 | } | |
1862 | ||
1863 | static int | |
1864 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1865 | unsigned int len) | |
1866 | { | |
1867 | int ret; | |
1868 | ||
af31f412 | 1869 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1870 | return -EPERM; |
1871 | ||
1872 | switch (cmd) { | |
1873 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1874 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1875 | break; |
1876 | ||
1877 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1878 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1879 | break; |
1880 | ||
1881 | default: | |
1882 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1883 | ret = -EINVAL; | |
1884 | } | |
1885 | ||
1886 | return ret; | |
1887 | } | |
1888 | ||
1889 | struct compat_ip6t_get_entries { | |
12b00c2c | 1890 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1891 | compat_uint_t size; |
1892 | struct compat_ip6t_entry entrytable[0]; | |
1893 | }; | |
1894 | ||
1895 | static int | |
1896 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1897 | void __user *userptr) | |
1898 | { | |
1899 | struct xt_counters *counters; | |
5452e425 | 1900 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1901 | void __user *pos; |
1902 | unsigned int size; | |
1903 | int ret = 0; | |
5452e425 | 1904 | const void *loc_cpu_entry; |
3bc3fe5e | 1905 | unsigned int i = 0; |
72b2b1dd | 1906 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1907 | |
1908 | counters = alloc_counters(table); | |
1909 | if (IS_ERR(counters)) | |
1910 | return PTR_ERR(counters); | |
1911 | ||
1912 | /* choose the copy that is on our node/cpu, ... | |
1913 | * This choice is lazy (because current thread is | |
1914 | * allowed to migrate to another cpu) | |
1915 | */ | |
1916 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1917 | pos = userptr; | |
1918 | size = total_size; | |
72b2b1dd JE |
1919 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1920 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1921 | &size, counters, i++); |
72b2b1dd JE |
1922 | if (ret != 0) |
1923 | break; | |
1924 | } | |
3bc3fe5e PM |
1925 | |
1926 | vfree(counters); | |
1927 | return ret; | |
1928 | } | |
1929 | ||
1930 | static int | |
336b517f AD |
1931 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1932 | int *len) | |
3bc3fe5e PM |
1933 | { |
1934 | int ret; | |
1935 | struct compat_ip6t_get_entries get; | |
1936 | struct xt_table *t; | |
1937 | ||
1938 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1939 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1940 | return -EINVAL; |
1941 | } | |
1942 | ||
1943 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1944 | return -EFAULT; | |
1945 | ||
1946 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1947 | duprintf("compat_get_entries: %u != %zu\n", |
1948 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1949 | return -EINVAL; |
1950 | } | |
1951 | ||
1952 | xt_compat_lock(AF_INET6); | |
336b517f | 1953 | t = xt_find_table_lock(net, AF_INET6, get.name); |
0cc8d8df | 1954 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1955 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1956 | struct xt_table_info info; |
9c547959 | 1957 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1958 | ret = compat_table_info(private, &info); |
1959 | if (!ret && get.size == info.size) { | |
1960 | ret = compat_copy_entries_to_user(private->size, | |
1961 | t, uptr->entrytable); | |
1962 | } else if (!ret) { | |
1963 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1964 | private->size, get.size); |
544473c1 | 1965 | ret = -EAGAIN; |
3bc3fe5e PM |
1966 | } |
1967 | xt_compat_flush_offsets(AF_INET6); | |
1968 | module_put(t->me); | |
1969 | xt_table_unlock(t); | |
1970 | } else | |
1971 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1972 | ||
1973 | xt_compat_unlock(AF_INET6); | |
1974 | return ret; | |
1975 | } | |
1976 | ||
1977 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
1978 | ||
1979 | static int | |
1980 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1981 | { | |
1982 | int ret; | |
1983 | ||
af31f412 | 1984 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1985 | return -EPERM; |
1986 | ||
1987 | switch (cmd) { | |
1988 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 1989 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1990 | break; |
1991 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 1992 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
1993 | break; |
1994 | default: | |
1995 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
1996 | } | |
1997 | return ret; | |
1998 | } | |
1999 | #endif | |
2000 | ||
1da177e4 LT |
2001 | static int |
2002 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2003 | { | |
2004 | int ret; | |
2005 | ||
af31f412 | 2006 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2007 | return -EPERM; |
2008 | ||
2009 | switch (cmd) { | |
2010 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2011 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2012 | break; |
2013 | ||
2014 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2015 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2016 | break; |
2017 | ||
2018 | default: | |
2019 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2020 | ret = -EINVAL; | |
2021 | } | |
2022 | ||
2023 | return ret; | |
2024 | } | |
2025 | ||
2026 | static int | |
2027 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2028 | { | |
2029 | int ret; | |
2030 | ||
af31f412 | 2031 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2032 | return -EPERM; |
2033 | ||
2034 | switch (cmd) { | |
433665c9 | 2035 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2036 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2037 | break; |
1da177e4 | 2038 | |
d924357c | 2039 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2040 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2041 | break; |
1da177e4 | 2042 | |
6b7d31fc HW |
2043 | case IP6T_SO_GET_REVISION_MATCH: |
2044 | case IP6T_SO_GET_REVISION_TARGET: { | |
12b00c2c | 2045 | struct xt_get_revision rev; |
2e4e6a17 | 2046 | int target; |
6b7d31fc HW |
2047 | |
2048 | if (*len != sizeof(rev)) { | |
2049 | ret = -EINVAL; | |
2050 | break; | |
2051 | } | |
2052 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2053 | ret = -EFAULT; | |
2054 | break; | |
2055 | } | |
6a8ab060 | 2056 | rev.name[sizeof(rev.name)-1] = 0; |
6b7d31fc HW |
2057 | |
2058 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2059 | target = 1; |
6b7d31fc | 2060 | else |
2e4e6a17 | 2061 | target = 0; |
6b7d31fc | 2062 | |
2e4e6a17 HW |
2063 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2064 | rev.revision, | |
2065 | target, &ret), | |
6b7d31fc HW |
2066 | "ip6t_%s", rev.name); |
2067 | break; | |
2068 | } | |
2069 | ||
1da177e4 LT |
2070 | default: |
2071 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2072 | ret = -EINVAL; | |
2073 | } | |
2074 | ||
2075 | return ret; | |
2076 | } | |
2077 | ||
35aad0ff JE |
2078 | struct xt_table *ip6t_register_table(struct net *net, |
2079 | const struct xt_table *table, | |
336b517f | 2080 | const struct ip6t_replace *repl) |
1da177e4 LT |
2081 | { |
2082 | int ret; | |
2e4e6a17 | 2083 | struct xt_table_info *newinfo; |
f3c5c1bf | 2084 | struct xt_table_info bootstrap = {0}; |
31836064 | 2085 | void *loc_cpu_entry; |
a98da11d | 2086 | struct xt_table *new_table; |
1da177e4 | 2087 | |
2e4e6a17 | 2088 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2089 | if (!newinfo) { |
2090 | ret = -ENOMEM; | |
2091 | goto out; | |
2092 | } | |
1da177e4 | 2093 | |
9c547959 | 2094 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2095 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2096 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2097 | |
0f234214 | 2098 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2099 | if (ret != 0) |
2100 | goto out_free; | |
1da177e4 | 2101 | |
336b517f | 2102 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2103 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2104 | ret = PTR_ERR(new_table); |
2105 | goto out_free; | |
1da177e4 | 2106 | } |
44d34e72 | 2107 | return new_table; |
1da177e4 | 2108 | |
44d34e72 AD |
2109 | out_free: |
2110 | xt_free_table_info(newinfo); | |
2111 | out: | |
2112 | return ERR_PTR(ret); | |
1da177e4 LT |
2113 | } |
2114 | ||
f54e9367 | 2115 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2116 | { |
2e4e6a17 | 2117 | struct xt_table_info *private; |
31836064 | 2118 | void *loc_cpu_entry; |
df200969 | 2119 | struct module *table_owner = table->me; |
72b2b1dd | 2120 | struct ip6t_entry *iter; |
31836064 | 2121 | |
2e4e6a17 | 2122 | private = xt_unregister_table(table); |
1da177e4 LT |
2123 | |
2124 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2125 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2126 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2127 | cleanup_entry(iter, net); |
df200969 AD |
2128 | if (private->number > private->initial_entries) |
2129 | module_put(table_owner); | |
2e4e6a17 | 2130 | xt_free_table_info(private); |
1da177e4 LT |
2131 | } |
2132 | ||
2133 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2134 | static inline bool |
1da177e4 LT |
2135 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2136 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2137 | bool invert) |
1da177e4 LT |
2138 | { |
2139 | return (type == test_type && code >= min_code && code <= max_code) | |
2140 | ^ invert; | |
2141 | } | |
2142 | ||
1d93a9cb | 2143 | static bool |
62fc8051 | 2144 | icmp6_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2145 | { |
5452e425 JE |
2146 | const struct icmp6hdr *ic; |
2147 | struct icmp6hdr _icmph; | |
f7108a20 | 2148 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2149 | |
2150 | /* Must not be a fragment. */ | |
f7108a20 | 2151 | if (par->fragoff != 0) |
1d93a9cb | 2152 | return false; |
1da177e4 | 2153 | |
f7108a20 | 2154 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2155 | if (ic == NULL) { |
2156 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2157 | * can't. Hence, no choice but to drop. |
2158 | */ | |
1da177e4 | 2159 | duprintf("Dropping evil ICMP tinygram.\n"); |
b4ba2611 | 2160 | par->hotdrop = true; |
1d93a9cb | 2161 | return false; |
1da177e4 LT |
2162 | } |
2163 | ||
2164 | return icmp6_type_code_match(icmpinfo->type, | |
2165 | icmpinfo->code[0], | |
2166 | icmpinfo->code[1], | |
2167 | ic->icmp6_type, ic->icmp6_code, | |
2168 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2169 | } | |
2170 | ||
2171 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 2172 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2173 | { |
9b4fce7a | 2174 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2175 | |
7f939713 | 2176 | /* Must specify no unknown invflags */ |
bd414ee6 | 2177 | return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2178 | } |
2179 | ||
2180 | /* The built-in targets: standard (NULL) and error. */ | |
4538506b JE |
2181 | static struct xt_target ip6t_builtin_tg[] __read_mostly = { |
2182 | { | |
243bf6e2 | 2183 | .name = XT_STANDARD_TARGET, |
4538506b JE |
2184 | .targetsize = sizeof(int), |
2185 | .family = NFPROTO_IPV6, | |
3bc3fe5e | 2186 | #ifdef CONFIG_COMPAT |
4538506b JE |
2187 | .compatsize = sizeof(compat_int_t), |
2188 | .compat_from_user = compat_standard_from_user, | |
2189 | .compat_to_user = compat_standard_to_user, | |
3bc3fe5e | 2190 | #endif |
4538506b JE |
2191 | }, |
2192 | { | |
243bf6e2 | 2193 | .name = XT_ERROR_TARGET, |
4538506b | 2194 | .target = ip6t_error, |
12b00c2c | 2195 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
2196 | .family = NFPROTO_IPV6, |
2197 | }, | |
1da177e4 LT |
2198 | }; |
2199 | ||
2200 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2201 | .pf = PF_INET6, | |
2202 | .set_optmin = IP6T_BASE_CTL, | |
2203 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2204 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2205 | #ifdef CONFIG_COMPAT |
2206 | .compat_set = compat_do_ip6t_set_ctl, | |
2207 | #endif | |
1da177e4 LT |
2208 | .get_optmin = IP6T_BASE_CTL, |
2209 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2210 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2211 | #ifdef CONFIG_COMPAT |
2212 | .compat_get = compat_do_ip6t_get_ctl, | |
2213 | #endif | |
16fcec35 | 2214 | .owner = THIS_MODULE, |
1da177e4 LT |
2215 | }; |
2216 | ||
4538506b JE |
2217 | static struct xt_match ip6t_builtin_mt[] __read_mostly = { |
2218 | { | |
2219 | .name = "icmp6", | |
2220 | .match = icmp6_match, | |
2221 | .matchsize = sizeof(struct ip6t_icmp), | |
2222 | .checkentry = icmp6_checkentry, | |
2223 | .proto = IPPROTO_ICMPV6, | |
2224 | .family = NFPROTO_IPV6, | |
2225 | }, | |
1da177e4 LT |
2226 | }; |
2227 | ||
3cb609d5 AD |
2228 | static int __net_init ip6_tables_net_init(struct net *net) |
2229 | { | |
383ca5b8 | 2230 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2231 | } |
2232 | ||
2233 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2234 | { | |
383ca5b8 | 2235 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2236 | } |
2237 | ||
2238 | static struct pernet_operations ip6_tables_net_ops = { | |
2239 | .init = ip6_tables_net_init, | |
2240 | .exit = ip6_tables_net_exit, | |
2241 | }; | |
2242 | ||
65b4b4e8 | 2243 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2244 | { |
2245 | int ret; | |
2246 | ||
3cb609d5 | 2247 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2248 | if (ret < 0) |
2249 | goto err1; | |
2e4e6a17 | 2250 | |
25985edc | 2251 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 2252 | ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 PM |
2253 | if (ret < 0) |
2254 | goto err2; | |
4538506b | 2255 | ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 PM |
2256 | if (ret < 0) |
2257 | goto err4; | |
1da177e4 LT |
2258 | |
2259 | /* Register setsockopt */ | |
2260 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2261 | if (ret < 0) |
2262 | goto err5; | |
1da177e4 | 2263 | |
ff67e4e4 | 2264 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2265 | return 0; |
0eff66e6 PM |
2266 | |
2267 | err5: | |
4538506b | 2268 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 | 2269 | err4: |
4538506b | 2270 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 | 2271 | err2: |
3cb609d5 | 2272 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2273 | err1: |
2274 | return ret; | |
1da177e4 LT |
2275 | } |
2276 | ||
65b4b4e8 | 2277 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2278 | { |
2279 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2280 | |
4538506b JE |
2281 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
2282 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); | |
3cb609d5 | 2283 | unregister_pernet_subsys(&ip6_tables_net_ops); |
1da177e4 LT |
2284 | } |
2285 | ||
2286 | EXPORT_SYMBOL(ip6t_register_table); | |
2287 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2288 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2289 | |
65b4b4e8 AM |
2290 | module_init(ip6_tables_init); |
2291 | module_exit(ip6_tables_fini); |