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) */ |
4b9e9796 | 198 | static inline bool unconditional(const struct ip6t_entry *e) |
ba9dda3a | 199 | { |
47901dc2 | 200 | static const struct ip6t_ip6 uncond; |
ba9dda3a | 201 | |
4b9e9796 | 202 | return e->target_offset == sizeof(struct ip6t_entry) && |
1ee858dd | 203 | memcmp(&e->ipv6, &uncond, sizeof(uncond)) == 0; |
ba9dda3a JK |
204 | } |
205 | ||
4b9e9796 | 206 | |
87a2e70d | 207 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
208 | ip6t_get_target_c(const struct ip6t_entry *e) |
209 | { | |
210 | return ip6t_get_target((struct ip6t_entry *)e); | |
211 | } | |
212 | ||
07a93626 | 213 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
ba9dda3a | 214 | /* This cries for unification! */ |
022748a9 | 215 | static const char *const hooknames[] = { |
6e23ae2a PM |
216 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
217 | [NF_INET_LOCAL_IN] = "INPUT", | |
218 | [NF_INET_FORWARD] = "FORWARD", | |
219 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
220 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
221 | }; |
222 | ||
223 | enum nf_ip_trace_comments { | |
224 | NF_IP6_TRACE_COMMENT_RULE, | |
225 | NF_IP6_TRACE_COMMENT_RETURN, | |
226 | NF_IP6_TRACE_COMMENT_POLICY, | |
227 | }; | |
228 | ||
022748a9 | 229 | static const char *const comments[] = { |
ba9dda3a JK |
230 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
231 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
232 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
233 | }; | |
234 | ||
235 | static struct nf_loginfo trace_loginfo = { | |
236 | .type = NF_LOG_TYPE_LOG, | |
237 | .u = { | |
238 | .log = { | |
239 | .level = 4, | |
240 | .logflags = NF_LOG_MASK, | |
241 | }, | |
242 | }, | |
243 | }; | |
244 | ||
022748a9 | 245 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 246 | static inline int |
d5d1baa1 | 247 | get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e, |
4f2f6f23 JE |
248 | const char *hookname, const char **chainname, |
249 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 250 | { |
87a2e70d | 251 | const struct xt_standard_target *t = (void *)ip6t_get_target_c(s); |
ba9dda3a | 252 | |
243bf6e2 | 253 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
254 | /* Head of user chain: ERROR target with chainname */ |
255 | *chainname = t->target.data; | |
256 | (*rulenum) = 0; | |
257 | } else if (s == e) { | |
258 | (*rulenum)++; | |
259 | ||
4b9e9796 | 260 | if (unconditional(s) && |
3666ed1c | 261 | strcmp(t->target.u.kernel.target->name, |
243bf6e2 | 262 | XT_STANDARD_TARGET) == 0 && |
4b9e9796 | 263 | t->verdict < 0) { |
ba9dda3a JK |
264 | /* Tail of chains: STANDARD target (return/policy) */ |
265 | *comment = *chainname == hookname | |
4f2f6f23 JE |
266 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
267 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
268 | } |
269 | return 1; | |
270 | } else | |
271 | (*rulenum)++; | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
d5d1baa1 | 276 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
277 | unsigned int hook, |
278 | const struct net_device *in, | |
279 | const struct net_device *out, | |
ecb6f85e | 280 | const char *tablename, |
d5d1baa1 JE |
281 | const struct xt_table_info *private, |
282 | const struct ip6t_entry *e) | |
ba9dda3a | 283 | { |
d5d1baa1 | 284 | const void *table_base; |
5452e425 | 285 | const struct ip6t_entry *root; |
4f2f6f23 | 286 | const char *hookname, *chainname, *comment; |
72b2b1dd | 287 | const struct ip6t_entry *iter; |
ba9dda3a | 288 | unsigned int rulenum = 0; |
30e0c6a6 | 289 | struct net *net = dev_net(in ? in : out); |
ba9dda3a | 290 | |
ccf5bd8c | 291 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
292 | root = get_entry(table_base, private->hook_entry[hook]); |
293 | ||
4f2f6f23 JE |
294 | hookname = chainname = hooknames[hook]; |
295 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; | |
ba9dda3a | 296 | |
72b2b1dd JE |
297 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
298 | if (get_chainname_rulenum(iter, e, hookname, | |
299 | &chainname, &comment, &rulenum) != 0) | |
300 | break; | |
ba9dda3a | 301 | |
30e0c6a6 | 302 | nf_log_packet(net, AF_INET6, hook, skb, in, out, &trace_loginfo, |
ba9dda3a JK |
303 | "TRACE: %s:%s:%s:%u ", |
304 | tablename, chainname, comment, rulenum); | |
305 | } | |
306 | #endif | |
307 | ||
98e86403 JE |
308 | static inline __pure struct ip6t_entry * |
309 | ip6t_next_entry(const struct ip6t_entry *entry) | |
310 | { | |
311 | return (void *)entry + entry->next_offset; | |
312 | } | |
313 | ||
1da177e4 LT |
314 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
315 | unsigned int | |
3db05fea | 316 | ip6t_do_table(struct sk_buff *skb, |
1da177e4 LT |
317 | unsigned int hook, |
318 | const struct net_device *in, | |
319 | const struct net_device *out, | |
fe1cb108 | 320 | struct xt_table *table) |
1da177e4 | 321 | { |
6b7d31fc | 322 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
323 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
324 | unsigned int verdict = NF_DROP; | |
325 | const char *indev, *outdev; | |
d5d1baa1 | 326 | const void *table_base; |
f3c5c1bf JE |
327 | struct ip6t_entry *e, **jumpstack; |
328 | unsigned int *stackptr, origptr, cpu; | |
d5d1baa1 | 329 | const struct xt_table_info *private; |
de74c169 | 330 | struct xt_action_param acpar; |
7f5c6d4f | 331 | unsigned int addend; |
1da177e4 LT |
332 | |
333 | /* Initialization */ | |
334 | indev = in ? in->name : nulldevname; | |
335 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
336 | /* We handle fragments by dealing with the first fragment as |
337 | * if it was a normal packet. All other fragments are treated | |
338 | * normally, except that they will NEVER match rules that ask | |
339 | * things we don't know, ie. tcp syn flag or ports). If the | |
340 | * rule is also a fragment-specific rule, non-fragments won't | |
341 | * match it. */ | |
b4ba2611 | 342 | acpar.hotdrop = false; |
de74c169 JE |
343 | acpar.in = in; |
344 | acpar.out = out; | |
345 | acpar.family = NFPROTO_IPV6; | |
346 | acpar.hooknum = hook; | |
1da177e4 | 347 | |
1da177e4 | 348 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
78454473 | 349 | |
7f5c6d4f ED |
350 | local_bh_disable(); |
351 | addend = xt_write_recseq_begin(); | |
942e4a2b | 352 | private = table->private; |
f3c5c1bf JE |
353 | cpu = smp_processor_id(); |
354 | table_base = private->entries[cpu]; | |
355 | jumpstack = (struct ip6t_entry **)private->jumpstack[cpu]; | |
7489aec8 | 356 | stackptr = per_cpu_ptr(private->stackptr, cpu); |
f3c5c1bf | 357 | origptr = *stackptr; |
78454473 | 358 | |
2e4e6a17 | 359 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 360 | |
1da177e4 | 361 | do { |
87a2e70d | 362 | const struct xt_entry_target *t; |
dcea992a | 363 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 364 | |
1da177e4 | 365 | IP_NF_ASSERT(e); |
84018f55 | 366 | acpar.thoff = 0; |
a1ff4ac8 | 367 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
b4ba2611 | 368 | &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) { |
dcea992a | 369 | no_match: |
a1ff4ac8 JE |
370 | e = ip6t_next_entry(e); |
371 | continue; | |
372 | } | |
1da177e4 | 373 | |
ef53d702 | 374 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
375 | acpar.match = ematch->u.kernel.match; |
376 | acpar.matchinfo = ematch->data; | |
377 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 378 | goto no_match; |
ef53d702 | 379 | } |
dcea992a | 380 | |
261abc8c | 381 | ADD_COUNTER(e->counters, skb->len, 1); |
1da177e4 | 382 | |
d5d1baa1 | 383 | t = ip6t_get_target_c(e); |
a1ff4ac8 | 384 | IP_NF_ASSERT(t->u.kernel.target); |
ba9dda3a | 385 | |
07a93626 | 386 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
387 | /* The packet is traced: log it */ |
388 | if (unlikely(skb->nf_trace)) | |
389 | trace_packet(skb, hook, in, out, | |
390 | table->name, private, e); | |
ba9dda3a | 391 | #endif |
a1ff4ac8 JE |
392 | /* Standard target? */ |
393 | if (!t->u.kernel.target->target) { | |
394 | int v; | |
395 | ||
87a2e70d | 396 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
397 | if (v < 0) { |
398 | /* Pop from stack? */ | |
243bf6e2 | 399 | if (v != XT_RETURN) { |
95c96174 | 400 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 401 | break; |
1da177e4 | 402 | } |
db856674 | 403 | if (*stackptr <= origptr) |
f3c5c1bf JE |
404 | e = get_entry(table_base, |
405 | private->underflow[hook]); | |
406 | else | |
407 | e = ip6t_next_entry(jumpstack[--*stackptr]); | |
a1ff4ac8 JE |
408 | continue; |
409 | } | |
3666ed1c JP |
410 | if (table_base + v != ip6t_next_entry(e) && |
411 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
f3c5c1bf JE |
412 | if (*stackptr >= private->stacksize) { |
413 | verdict = NF_DROP; | |
414 | break; | |
415 | } | |
416 | jumpstack[(*stackptr)++] = e; | |
a1ff4ac8 | 417 | } |
1da177e4 | 418 | |
a1ff4ac8 | 419 | e = get_entry(table_base, v); |
7a6b1c46 JE |
420 | continue; |
421 | } | |
422 | ||
de74c169 JE |
423 | acpar.target = t->u.kernel.target; |
424 | acpar.targinfo = t->data; | |
7eb35586 | 425 | |
de74c169 | 426 | verdict = t->u.kernel.target->target(skb, &acpar); |
243bf6e2 | 427 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
428 | e = ip6t_next_entry(e); |
429 | else | |
430 | /* Verdict */ | |
431 | break; | |
b4ba2611 | 432 | } while (!acpar.hotdrop); |
1da177e4 | 433 | |
f3c5c1bf | 434 | *stackptr = origptr; |
7f5c6d4f ED |
435 | |
436 | xt_write_recseq_end(addend); | |
437 | local_bh_enable(); | |
1da177e4 LT |
438 | |
439 | #ifdef DEBUG_ALLOW_ALL | |
440 | return NF_ACCEPT; | |
441 | #else | |
b4ba2611 | 442 | if (acpar.hotdrop) |
1da177e4 LT |
443 | return NF_DROP; |
444 | else return verdict; | |
445 | #endif | |
446 | } | |
447 | ||
1da177e4 LT |
448 | /* Figures out from what hook each rule can be called: returns 0 if |
449 | there are loops. Puts hook bitmask in comefrom. */ | |
450 | static int | |
d5d1baa1 | 451 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 452 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
453 | { |
454 | unsigned int hook; | |
455 | ||
456 | /* No recursion; use packet counter to save back ptrs (reset | |
457 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 458 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 459 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 460 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
461 | |
462 | if (!(valid_hooks & (1 << hook))) | |
463 | continue; | |
464 | ||
465 | /* Set initial back pointer. */ | |
466 | e->counters.pcnt = pos; | |
467 | ||
468 | for (;;) { | |
87a2e70d | 469 | const struct xt_standard_target *t |
d5d1baa1 | 470 | = (void *)ip6t_get_target_c(e); |
9c547959 | 471 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 472 | |
6e23ae2a | 473 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
654d0fbd | 474 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
475 | hook, pos, e->comefrom); |
476 | return 0; | |
477 | } | |
9c547959 | 478 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
479 | |
480 | /* Unconditional return/END. */ | |
4b9e9796 | 481 | if ((unconditional(e) && |
3666ed1c | 482 | (strcmp(t->target.u.user.name, |
243bf6e2 | 483 | XT_STANDARD_TARGET) == 0) && |
4b9e9796 | 484 | t->verdict < 0) || visited) { |
1da177e4 LT |
485 | unsigned int oldpos, size; |
486 | ||
1f9352ae | 487 | if ((strcmp(t->target.u.user.name, |
243bf6e2 | 488 | XT_STANDARD_TARGET) == 0) && |
1f9352ae | 489 | t->verdict < -NF_MAX_VERDICT - 1) { |
74c9c0c1 DM |
490 | duprintf("mark_source_chains: bad " |
491 | "negative verdict (%i)\n", | |
492 | t->verdict); | |
493 | return 0; | |
494 | } | |
495 | ||
1da177e4 LT |
496 | /* Return: backtrack through the last |
497 | big jump. */ | |
498 | do { | |
6e23ae2a | 499 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
500 | #ifdef DEBUG_IP_FIREWALL_USER |
501 | if (e->comefrom | |
6e23ae2a | 502 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
503 | duprintf("Back unset " |
504 | "on hook %u " | |
505 | "rule %u\n", | |
506 | hook, pos); | |
507 | } | |
508 | #endif | |
509 | oldpos = pos; | |
510 | pos = e->counters.pcnt; | |
511 | e->counters.pcnt = 0; | |
512 | ||
513 | /* We're at the start. */ | |
514 | if (pos == oldpos) | |
515 | goto next; | |
516 | ||
517 | e = (struct ip6t_entry *) | |
31836064 | 518 | (entry0 + pos); |
1da177e4 LT |
519 | } while (oldpos == pos + e->next_offset); |
520 | ||
521 | /* Move along one */ | |
522 | size = e->next_offset; | |
523 | e = (struct ip6t_entry *) | |
31836064 | 524 | (entry0 + pos + size); |
82e2616a FW |
525 | if (pos + size >= newinfo->size) |
526 | return 0; | |
1da177e4 LT |
527 | e->counters.pcnt = pos; |
528 | pos += size; | |
529 | } else { | |
530 | int newpos = t->verdict; | |
531 | ||
532 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 533 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 534 | newpos >= 0) { |
74c9c0c1 DM |
535 | if (newpos > newinfo->size - |
536 | sizeof(struct ip6t_entry)) { | |
537 | duprintf("mark_source_chains: " | |
538 | "bad verdict (%i)\n", | |
539 | newpos); | |
540 | return 0; | |
541 | } | |
1da177e4 LT |
542 | /* This a jump; chase it. */ |
543 | duprintf("Jump rule %u -> %u\n", | |
544 | pos, newpos); | |
545 | } else { | |
546 | /* ... this is a fallthru */ | |
547 | newpos = pos + e->next_offset; | |
82e2616a FW |
548 | if (newpos >= newinfo->size) |
549 | return 0; | |
1da177e4 LT |
550 | } |
551 | e = (struct ip6t_entry *) | |
31836064 | 552 | (entry0 + newpos); |
1da177e4 LT |
553 | e->counters.pcnt = pos; |
554 | pos = newpos; | |
555 | } | |
556 | } | |
557 | next: | |
558 | duprintf("Finished chain %u\n", hook); | |
559 | } | |
560 | return 1; | |
561 | } | |
562 | ||
87a2e70d | 563 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 564 | { |
6be3d859 JE |
565 | struct xt_mtdtor_param par; |
566 | ||
f54e9367 | 567 | par.net = net; |
6be3d859 JE |
568 | par.match = m->u.kernel.match; |
569 | par.matchinfo = m->data; | |
916a917d | 570 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
571 | if (par.match->destroy != NULL) |
572 | par.match->destroy(&par); | |
573 | module_put(par.match->me); | |
1da177e4 LT |
574 | } |
575 | ||
022748a9 | 576 | static int |
4b9e9796 | 577 | check_entry(const struct ip6t_entry *e) |
f173c8a1 | 578 | { |
87a2e70d | 579 | const struct xt_entry_target *t; |
f173c8a1 | 580 | |
4b9e9796 | 581 | if (!ip6_checkentry(&e->ipv6)) |
f173c8a1 | 582 | return -EINVAL; |
f173c8a1 | 583 | |
87a2e70d | 584 | if (e->target_offset + sizeof(struct xt_entry_target) > |
f173c8a1 PM |
585 | e->next_offset) |
586 | return -EINVAL; | |
587 | ||
d5d1baa1 | 588 | t = ip6t_get_target_c(e); |
f173c8a1 PM |
589 | if (e->target_offset + t->u.target_size > e->next_offset) |
590 | return -EINVAL; | |
591 | ||
592 | return 0; | |
593 | } | |
594 | ||
87a2e70d | 595 | static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
f173c8a1 | 596 | { |
9b4fce7a | 597 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
598 | int ret; |
599 | ||
9b4fce7a JE |
600 | par->match = m->u.kernel.match; |
601 | par->matchinfo = m->data; | |
602 | ||
916a917d | 603 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 604 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
367c6790 | 605 | if (ret < 0) { |
f173c8a1 | 606 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 607 | par.match->name); |
367c6790 | 608 | return ret; |
f173c8a1 | 609 | } |
367c6790 | 610 | return 0; |
f173c8a1 PM |
611 | } |
612 | ||
022748a9 | 613 | static int |
87a2e70d | 614 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 615 | { |
6709dbbb | 616 | struct xt_match *match; |
3cdc7c95 | 617 | int ret; |
1da177e4 | 618 | |
fd0ec0e6 JE |
619 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
620 | m->u.user.revision); | |
621 | if (IS_ERR(match)) { | |
f173c8a1 | 622 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 623 | return PTR_ERR(match); |
1da177e4 LT |
624 | } |
625 | m->u.kernel.match = match; | |
1da177e4 | 626 | |
6bdb331b | 627 | ret = check_match(m, par); |
3cdc7c95 PM |
628 | if (ret) |
629 | goto err; | |
630 | ||
1da177e4 | 631 | return 0; |
3cdc7c95 PM |
632 | err: |
633 | module_put(m->u.kernel.match->me); | |
634 | return ret; | |
1da177e4 LT |
635 | } |
636 | ||
add67461 | 637 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 638 | { |
87a2e70d | 639 | struct xt_entry_target *t = ip6t_get_target(e); |
af5d6dc2 | 640 | struct xt_tgchk_param par = { |
add67461 | 641 | .net = net, |
af5d6dc2 JE |
642 | .table = name, |
643 | .entryinfo = e, | |
644 | .target = t->u.kernel.target, | |
645 | .targinfo = t->data, | |
646 | .hook_mask = e->comefrom, | |
916a917d | 647 | .family = NFPROTO_IPV6, |
af5d6dc2 | 648 | }; |
1da177e4 | 649 | int ret; |
1da177e4 | 650 | |
f173c8a1 | 651 | t = ip6t_get_target(e); |
916a917d | 652 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 653 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
367c6790 | 654 | if (ret < 0) { |
f173c8a1 PM |
655 | duprintf("ip_tables: check failed for `%s'.\n", |
656 | t->u.kernel.target->name); | |
367c6790 | 657 | return ret; |
1da177e4 | 658 | } |
367c6790 | 659 | return 0; |
f173c8a1 | 660 | } |
1da177e4 | 661 | |
022748a9 | 662 | static int |
a83d8e8d | 663 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
0559518b | 664 | unsigned int size) |
f173c8a1 | 665 | { |
87a2e70d | 666 | struct xt_entry_target *t; |
f173c8a1 PM |
667 | struct xt_target *target; |
668 | int ret; | |
669 | unsigned int j; | |
9b4fce7a | 670 | struct xt_mtchk_param mtpar; |
dcea992a | 671 | struct xt_entry_match *ematch; |
f173c8a1 | 672 | |
1da177e4 | 673 | j = 0; |
a83d8e8d | 674 | mtpar.net = net; |
9b4fce7a JE |
675 | mtpar.table = name; |
676 | mtpar.entryinfo = &e->ipv6; | |
677 | mtpar.hook_mask = e->comefrom; | |
916a917d | 678 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 679 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 680 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 681 | if (ret != 0) |
6bdb331b JE |
682 | goto cleanup_matches; |
683 | ++j; | |
dcea992a | 684 | } |
1da177e4 LT |
685 | |
686 | t = ip6t_get_target(e); | |
d2a7b6ba JE |
687 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
688 | t->u.user.revision); | |
689 | if (IS_ERR(target)) { | |
f173c8a1 | 690 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 691 | ret = PTR_ERR(target); |
1da177e4 LT |
692 | goto cleanup_matches; |
693 | } | |
694 | t->u.kernel.target = target; | |
6b7d31fc | 695 | |
add67461 | 696 | ret = check_target(e, net, name); |
3cdc7c95 PM |
697 | if (ret) |
698 | goto err; | |
1da177e4 | 699 | return 0; |
3cdc7c95 PM |
700 | err: |
701 | module_put(t->u.kernel.target->me); | |
1da177e4 | 702 | cleanup_matches: |
6bdb331b JE |
703 | xt_ematch_foreach(ematch, e) { |
704 | if (j-- == 0) | |
dcea992a | 705 | break; |
6bdb331b JE |
706 | cleanup_match(ematch, net); |
707 | } | |
1da177e4 LT |
708 | return ret; |
709 | } | |
710 | ||
d5d1baa1 | 711 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 | 712 | { |
87a2e70d | 713 | const struct xt_entry_target *t; |
e2fe35c1 JE |
714 | unsigned int verdict; |
715 | ||
4b9e9796 | 716 | if (!unconditional(e)) |
e2fe35c1 | 717 | return false; |
d5d1baa1 | 718 | t = ip6t_get_target_c(e); |
e2fe35c1 JE |
719 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
720 | return false; | |
87a2e70d | 721 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
722 | verdict = -verdict - 1; |
723 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
724 | } | |
725 | ||
022748a9 | 726 | static int |
1da177e4 | 727 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 728 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
729 | const unsigned char *base, |
730 | const unsigned char *limit, | |
1da177e4 LT |
731 | const unsigned int *hook_entries, |
732 | const unsigned int *underflows, | |
0559518b | 733 | unsigned int valid_hooks) |
1da177e4 LT |
734 | { |
735 | unsigned int h; | |
4b9e9796 | 736 | int err; |
1da177e4 | 737 | |
3666ed1c | 738 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
4b9e9796 S |
739 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit || |
740 | (unsigned char *)e + e->next_offset > limit) { | |
1da177e4 LT |
741 | duprintf("Bad offset %p\n", e); |
742 | return -EINVAL; | |
743 | } | |
744 | ||
745 | if (e->next_offset | |
87a2e70d | 746 | < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) { |
1da177e4 LT |
747 | duprintf("checking: element %p size %u\n", |
748 | e, e->next_offset); | |
749 | return -EINVAL; | |
750 | } | |
751 | ||
4b9e9796 | 752 | err = check_entry(e); |
ea878a44 | 753 | |
4b9e9796 S |
754 | if (err) |
755 | return err; | |
756 | ||
1da177e4 | 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 | 764 | if (!check_underflow(e)) { |
1ee858dd FW |
765 | pr_debug("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 | 1243 | if (copy_to_user(counters_ptr, counters, |
c5e4ef49 TG |
1244 | sizeof(struct xt_counters) * num_counters) != 0) { |
1245 | /* Silent error, can't fail, new table is already in place */ | |
1246 | net_warn_ratelimited("ip6tables: counters copy to user failed while replacing table\n"); | |
1247 | } | |
1da177e4 | 1248 | vfree(counters); |
2e4e6a17 | 1249 | xt_table_unlock(t); |
1da177e4 LT |
1250 | return ret; |
1251 | ||
1252 | put_module: | |
1253 | module_put(t->me); | |
2e4e6a17 | 1254 | xt_table_unlock(t); |
1da177e4 | 1255 | free_newinfo_counters_untrans: |
1da177e4 | 1256 | vfree(counters); |
3bc3fe5e PM |
1257 | out: |
1258 | return ret; | |
1259 | } | |
1260 | ||
1261 | static int | |
d5d1baa1 | 1262 | do_replace(struct net *net, const void __user *user, unsigned int len) |
3bc3fe5e PM |
1263 | { |
1264 | int ret; | |
1265 | struct ip6t_replace tmp; | |
1266 | struct xt_table_info *newinfo; | |
1267 | void *loc_cpu_entry; | |
72b2b1dd | 1268 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1269 | |
1270 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1271 | return -EFAULT; | |
1272 | ||
1273 | /* overflow check */ | |
1274 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1275 | return -ENOMEM; | |
bb560593 DJ |
1276 | if (tmp.num_counters == 0) |
1277 | return -EINVAL; | |
1278 | ||
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; | |
2e4e6a17 | 1320 | struct xt_table *t; |
5452e425 | 1321 | const struct xt_table_info *private; |
6b7d31fc | 1322 | int ret = 0; |
5452e425 | 1323 | const void *loc_cpu_entry; |
72b2b1dd | 1324 | struct ip6t_entry *iter; |
7f5c6d4f | 1325 | unsigned int addend; |
1da177e4 | 1326 | |
0a052338 FW |
1327 | paddc = xt_copy_counters_from_user(user, len, &tmp, compat); |
1328 | if (IS_ERR(paddc)) | |
1329 | return PTR_ERR(paddc); | |
1330 | t = xt_find_table_lock(net, AF_INET6, tmp.name); | |
0cc8d8df | 1331 | if (IS_ERR_OR_NULL(t)) { |
6b7d31fc | 1332 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1333 | goto free; |
6b7d31fc | 1334 | } |
1da177e4 | 1335 | |
942e4a2b SH |
1336 | |
1337 | local_bh_disable(); | |
2e4e6a17 | 1338 | private = t->private; |
0a052338 | 1339 | if (private->number != tmp.num_counters) { |
1da177e4 LT |
1340 | ret = -EINVAL; |
1341 | goto unlock_up_free; | |
1342 | } | |
1343 | ||
1344 | i = 0; | |
31836064 | 1345 | /* Choose the copy that is on our node */ |
942e4a2b | 1346 | curcpu = smp_processor_id(); |
7f5c6d4f | 1347 | addend = xt_write_recseq_begin(); |
942e4a2b | 1348 | loc_cpu_entry = private->entries[curcpu]; |
0559518b JE |
1349 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1350 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1351 | ++i; | |
1352 | } | |
7f5c6d4f | 1353 | xt_write_recseq_end(addend); |
942e4a2b | 1354 | |
1da177e4 | 1355 | unlock_up_free: |
942e4a2b | 1356 | local_bh_enable(); |
2e4e6a17 | 1357 | xt_table_unlock(t); |
6b7d31fc | 1358 | module_put(t->me); |
1da177e4 LT |
1359 | free: |
1360 | vfree(paddc); | |
1361 | ||
1362 | return ret; | |
1363 | } | |
1364 | ||
3bc3fe5e PM |
1365 | #ifdef CONFIG_COMPAT |
1366 | struct compat_ip6t_replace { | |
12b00c2c | 1367 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1368 | u32 valid_hooks; |
1369 | u32 num_entries; | |
1370 | u32 size; | |
1371 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1372 | u32 underflow[NF_INET_NUMHOOKS]; | |
1373 | u32 num_counters; | |
87a2e70d | 1374 | compat_uptr_t counters; /* struct xt_counters * */ |
3bc3fe5e PM |
1375 | struct compat_ip6t_entry entries[0]; |
1376 | }; | |
1377 | ||
1378 | static int | |
1379 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1380 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1381 | unsigned int i) |
3bc3fe5e | 1382 | { |
87a2e70d | 1383 | struct xt_entry_target *t; |
3bc3fe5e PM |
1384 | struct compat_ip6t_entry __user *ce; |
1385 | u_int16_t target_offset, next_offset; | |
1386 | compat_uint_t origsize; | |
dcea992a JE |
1387 | const struct xt_entry_match *ematch; |
1388 | int ret = 0; | |
3bc3fe5e | 1389 | |
3bc3fe5e PM |
1390 | origsize = *size; |
1391 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
0559518b JE |
1392 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1393 | copy_to_user(&ce->counters, &counters[i], | |
1394 | sizeof(counters[i])) != 0) | |
1395 | return -EFAULT; | |
3bc3fe5e PM |
1396 | |
1397 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1398 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1399 | ||
dcea992a JE |
1400 | xt_ematch_foreach(ematch, e) { |
1401 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1402 | if (ret != 0) | |
6bdb331b | 1403 | return ret; |
dcea992a | 1404 | } |
3bc3fe5e | 1405 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1406 | t = ip6t_get_target(e); |
1407 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1408 | if (ret) | |
0559518b | 1409 | return ret; |
3bc3fe5e | 1410 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1411 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1412 | put_user(next_offset, &ce->next_offset) != 0) | |
1413 | return -EFAULT; | |
3bc3fe5e | 1414 | return 0; |
3bc3fe5e PM |
1415 | } |
1416 | ||
022748a9 | 1417 | static int |
87a2e70d | 1418 | compat_find_calc_match(struct xt_entry_match *m, |
3bc3fe5e PM |
1419 | const struct ip6t_ip6 *ipv6, |
1420 | unsigned int hookmask, | |
6bdb331b | 1421 | int *size) |
3bc3fe5e PM |
1422 | { |
1423 | struct xt_match *match; | |
1424 | ||
fd0ec0e6 JE |
1425 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
1426 | m->u.user.revision); | |
1427 | if (IS_ERR(match)) { | |
3bc3fe5e PM |
1428 | duprintf("compat_check_calc_match: `%s' not found\n", |
1429 | m->u.user.name); | |
fd0ec0e6 | 1430 | return PTR_ERR(match); |
3bc3fe5e PM |
1431 | } |
1432 | m->u.kernel.match = match; | |
1433 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1434 | return 0; |
1435 | } | |
1436 | ||
0559518b | 1437 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e | 1438 | { |
87a2e70d | 1439 | struct xt_entry_target *t; |
dcea992a | 1440 | struct xt_entry_match *ematch; |
3bc3fe5e | 1441 | |
3bc3fe5e | 1442 | /* Cleanup all matches */ |
dcea992a | 1443 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1444 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1445 | t = compat_ip6t_get_target(e); |
1446 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1447 | } |
1448 | ||
022748a9 | 1449 | static int |
3bc3fe5e PM |
1450 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1451 | struct xt_table_info *newinfo, | |
1452 | unsigned int *size, | |
d5d1baa1 | 1453 | const unsigned char *base, |
151cc2f5 | 1454 | const unsigned char *limit) |
3bc3fe5e | 1455 | { |
dcea992a | 1456 | struct xt_entry_match *ematch; |
87a2e70d | 1457 | struct xt_entry_target *t; |
3bc3fe5e PM |
1458 | struct xt_target *target; |
1459 | unsigned int entry_offset; | |
b0a6363c | 1460 | unsigned int j; |
151cc2f5 | 1461 | int ret, off; |
3bc3fe5e PM |
1462 | |
1463 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c | 1464 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
4b9e9796 S |
1465 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit || |
1466 | (unsigned char *)e + e->next_offset > limit) { | |
3bc3fe5e PM |
1467 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1468 | return -EINVAL; | |
1469 | } | |
1470 | ||
1471 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1472 | sizeof(struct compat_xt_entry_target)) { | |
1473 | duprintf("checking: element %p size %u\n", | |
1474 | e, e->next_offset); | |
1475 | return -EINVAL; | |
1476 | } | |
1477 | ||
1478 | /* For purposes of check_entry casting the compat entry is fine */ | |
4b9e9796 | 1479 | ret = check_entry((struct ip6t_entry *)e); |
ea878a44 | 1480 | |
3bc3fe5e PM |
1481 | if (ret) |
1482 | return ret; | |
1483 | ||
1484 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1485 | entry_offset = (void *)e - (void *)base; | |
1486 | j = 0; | |
dcea992a | 1487 | xt_ematch_foreach(ematch, e) { |
b560137e FW |
1488 | ret = compat_find_calc_match(ematch, &e->ipv6, e->comefrom, |
1489 | &off); | |
dcea992a | 1490 | if (ret != 0) |
6bdb331b JE |
1491 | goto release_matches; |
1492 | ++j; | |
dcea992a | 1493 | } |
3bc3fe5e PM |
1494 | |
1495 | t = compat_ip6t_get_target(e); | |
d2a7b6ba JE |
1496 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
1497 | t->u.user.revision); | |
1498 | if (IS_ERR(target)) { | |
3bc3fe5e PM |
1499 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
1500 | t->u.user.name); | |
d2a7b6ba | 1501 | ret = PTR_ERR(target); |
3bc3fe5e PM |
1502 | goto release_matches; |
1503 | } | |
1504 | t->u.kernel.target = target; | |
1505 | ||
1506 | off += xt_compat_target_offset(target); | |
1507 | *size += off; | |
1508 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1509 | if (ret) | |
1510 | goto out; | |
1511 | ||
3bc3fe5e PM |
1512 | return 0; |
1513 | ||
1514 | out: | |
1515 | module_put(t->u.kernel.target->me); | |
1516 | release_matches: | |
6bdb331b JE |
1517 | xt_ematch_foreach(ematch, e) { |
1518 | if (j-- == 0) | |
dcea992a | 1519 | break; |
6bdb331b JE |
1520 | module_put(ematch->u.kernel.match->me); |
1521 | } | |
3bc3fe5e PM |
1522 | return ret; |
1523 | } | |
1524 | ||
fbe426f8 | 1525 | static void |
3bc3fe5e | 1526 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, |
b560137e | 1527 | unsigned int *size, |
3bc3fe5e PM |
1528 | struct xt_table_info *newinfo, unsigned char *base) |
1529 | { | |
87a2e70d | 1530 | struct xt_entry_target *t; |
3bc3fe5e PM |
1531 | struct ip6t_entry *de; |
1532 | unsigned int origsize; | |
fbe426f8 | 1533 | int h; |
dcea992a | 1534 | struct xt_entry_match *ematch; |
3bc3fe5e | 1535 | |
3bc3fe5e PM |
1536 | origsize = *size; |
1537 | de = (struct ip6t_entry *)*dstptr; | |
1538 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1539 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1540 | ||
1541 | *dstptr += sizeof(struct ip6t_entry); | |
1542 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1543 | ||
fbe426f8 FW |
1544 | xt_ematch_foreach(ematch, e) |
1545 | xt_compat_match_from_user(ematch, dstptr, size); | |
1546 | ||
3bc3fe5e PM |
1547 | de->target_offset = e->target_offset - (origsize - *size); |
1548 | t = compat_ip6t_get_target(e); | |
3bc3fe5e PM |
1549 | xt_compat_target_from_user(t, dstptr, size); |
1550 | ||
1551 | de->next_offset = e->next_offset - (origsize - *size); | |
1552 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1553 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1554 | newinfo->hook_entry[h] -= origsize - *size; | |
1555 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1556 | newinfo->underflow[h] -= origsize - *size; | |
1557 | } | |
3bc3fe5e PM |
1558 | } |
1559 | ||
1560 | static int | |
f54e9367 | 1561 | translate_compat_table(struct net *net, |
3bc3fe5e PM |
1562 | struct xt_table_info **pinfo, |
1563 | void **pentry0, | |
b560137e | 1564 | const struct compat_ip6t_replace *compatr) |
3bc3fe5e PM |
1565 | { |
1566 | unsigned int i, j; | |
1567 | struct xt_table_info *newinfo, *info; | |
1568 | void *pos, *entry0, *entry1; | |
72b2b1dd | 1569 | struct compat_ip6t_entry *iter0; |
151cc2f5 | 1570 | struct ip6t_replace repl; |
3bc3fe5e | 1571 | unsigned int size; |
72b2b1dd | 1572 | int ret = 0; |
3bc3fe5e PM |
1573 | |
1574 | info = *pinfo; | |
1575 | entry0 = *pentry0; | |
b560137e FW |
1576 | size = compatr->size; |
1577 | info->number = compatr->num_entries; | |
3bc3fe5e PM |
1578 | |
1579 | duprintf("translate_compat_table: size %u\n", info->size); | |
1580 | j = 0; | |
1581 | xt_compat_lock(AF_INET6); | |
b560137e | 1582 | xt_compat_init_offsets(AF_INET6, compatr->num_entries); |
3bc3fe5e | 1583 | /* Walk through entries, checking offsets. */ |
b560137e | 1584 | xt_entry_foreach(iter0, entry0, compatr->size) { |
72b2b1dd | 1585 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
6b4ff2d7 | 1586 | entry0, |
151cc2f5 | 1587 | entry0 + compatr->size); |
72b2b1dd | 1588 | if (ret != 0) |
0559518b JE |
1589 | goto out_unlock; |
1590 | ++j; | |
72b2b1dd | 1591 | } |
3bc3fe5e PM |
1592 | |
1593 | ret = -EINVAL; | |
b560137e | 1594 | if (j != compatr->num_entries) { |
3bc3fe5e | 1595 | duprintf("translate_compat_table: %u not %u entries\n", |
b560137e | 1596 | j, compatr->num_entries); |
3bc3fe5e PM |
1597 | goto out_unlock; |
1598 | } | |
1599 | ||
3bc3fe5e PM |
1600 | ret = -ENOMEM; |
1601 | newinfo = xt_alloc_table_info(size); | |
1602 | if (!newinfo) | |
1603 | goto out_unlock; | |
1604 | ||
b560137e | 1605 | newinfo->number = compatr->num_entries; |
3bc3fe5e | 1606 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
151cc2f5 FW |
1607 | newinfo->hook_entry[i] = compatr->hook_entry[i]; |
1608 | newinfo->underflow[i] = compatr->underflow[i]; | |
3bc3fe5e PM |
1609 | } |
1610 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1611 | pos = entry1; | |
151cc2f5 | 1612 | size = compatr->size; |
fbe426f8 FW |
1613 | xt_entry_foreach(iter0, entry0, compatr->size) |
1614 | compat_copy_entry_from_user(iter0, &pos, &size, | |
1615 | newinfo, entry1); | |
1616 | ||
151cc2f5 | 1617 | /* all module references in entry0 are now gone. */ |
3bc3fe5e PM |
1618 | xt_compat_flush_offsets(AF_INET6); |
1619 | xt_compat_unlock(AF_INET6); | |
3bc3fe5e | 1620 | |
151cc2f5 | 1621 | memcpy(&repl, compatr, sizeof(*compatr)); |
3bc3fe5e | 1622 | |
151cc2f5 FW |
1623 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1624 | repl.hook_entry[i] = newinfo->hook_entry[i]; | |
1625 | repl.underflow[i] = newinfo->underflow[i]; | |
3bc3fe5e PM |
1626 | } |
1627 | ||
151cc2f5 FW |
1628 | repl.num_counters = 0; |
1629 | repl.counters = NULL; | |
1630 | repl.size = newinfo->size; | |
1631 | ret = translate_table(net, newinfo, entry1, &repl); | |
1632 | if (ret) | |
1633 | goto free_newinfo; | |
3bc3fe5e PM |
1634 | |
1635 | *pinfo = newinfo; | |
1636 | *pentry0 = entry1; | |
1637 | xt_free_table_info(info); | |
1638 | return 0; | |
1639 | ||
1640 | free_newinfo: | |
1641 | xt_free_table_info(newinfo); | |
151cc2f5 FW |
1642 | return ret; |
1643 | out_unlock: | |
1644 | xt_compat_flush_offsets(AF_INET6); | |
1645 | xt_compat_unlock(AF_INET6); | |
b560137e | 1646 | xt_entry_foreach(iter0, entry0, compatr->size) { |
0559518b | 1647 | if (j-- == 0) |
72b2b1dd | 1648 | break; |
0559518b JE |
1649 | compat_release_entry(iter0); |
1650 | } | |
3bc3fe5e | 1651 | return ret; |
3bc3fe5e PM |
1652 | } |
1653 | ||
1654 | static int | |
336b517f | 1655 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1656 | { |
1657 | int ret; | |
1658 | struct compat_ip6t_replace tmp; | |
1659 | struct xt_table_info *newinfo; | |
1660 | void *loc_cpu_entry; | |
72b2b1dd | 1661 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1662 | |
1663 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1664 | return -EFAULT; | |
1665 | ||
1666 | /* overflow check */ | |
1667 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1668 | return -ENOMEM; | |
1669 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1670 | return -ENOMEM; | |
bb560593 DJ |
1671 | if (tmp.num_counters == 0) |
1672 | return -EINVAL; | |
1673 | ||
6a8ab060 | 1674 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1675 | |
1676 | newinfo = xt_alloc_table_info(tmp.size); | |
1677 | if (!newinfo) | |
1678 | return -ENOMEM; | |
1679 | ||
9c547959 | 1680 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1681 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1682 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1683 | tmp.size) != 0) { | |
1684 | ret = -EFAULT; | |
1685 | goto free_newinfo; | |
1686 | } | |
1687 | ||
b560137e | 1688 | ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1689 | if (ret != 0) |
1690 | goto free_newinfo; | |
1691 | ||
1692 | duprintf("compat_do_replace: Translated table\n"); | |
1693 | ||
336b517f | 1694 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1695 | tmp.num_counters, compat_ptr(tmp.counters)); |
1696 | if (ret) | |
1697 | goto free_newinfo_untrans; | |
1698 | return 0; | |
1699 | ||
1700 | free_newinfo_untrans: | |
72b2b1dd | 1701 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1702 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1703 | free_newinfo: |
1704 | xt_free_table_info(newinfo); | |
1705 | return ret; | |
1706 | } | |
1707 | ||
1708 | static int | |
1709 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1710 | unsigned int len) | |
1711 | { | |
1712 | int ret; | |
1713 | ||
af31f412 | 1714 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1715 | return -EPERM; |
1716 | ||
1717 | switch (cmd) { | |
1718 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1719 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1720 | break; |
1721 | ||
1722 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1723 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1724 | break; |
1725 | ||
1726 | default: | |
1727 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1728 | ret = -EINVAL; | |
1729 | } | |
1730 | ||
1731 | return ret; | |
1732 | } | |
1733 | ||
1734 | struct compat_ip6t_get_entries { | |
12b00c2c | 1735 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1736 | compat_uint_t size; |
1737 | struct compat_ip6t_entry entrytable[0]; | |
1738 | }; | |
1739 | ||
1740 | static int | |
1741 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1742 | void __user *userptr) | |
1743 | { | |
1744 | struct xt_counters *counters; | |
5452e425 | 1745 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1746 | void __user *pos; |
1747 | unsigned int size; | |
1748 | int ret = 0; | |
5452e425 | 1749 | const void *loc_cpu_entry; |
3bc3fe5e | 1750 | unsigned int i = 0; |
72b2b1dd | 1751 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1752 | |
1753 | counters = alloc_counters(table); | |
1754 | if (IS_ERR(counters)) | |
1755 | return PTR_ERR(counters); | |
1756 | ||
1757 | /* choose the copy that is on our node/cpu, ... | |
1758 | * This choice is lazy (because current thread is | |
1759 | * allowed to migrate to another cpu) | |
1760 | */ | |
1761 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1762 | pos = userptr; | |
1763 | size = total_size; | |
72b2b1dd JE |
1764 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1765 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1766 | &size, counters, i++); |
72b2b1dd JE |
1767 | if (ret != 0) |
1768 | break; | |
1769 | } | |
3bc3fe5e PM |
1770 | |
1771 | vfree(counters); | |
1772 | return ret; | |
1773 | } | |
1774 | ||
1775 | static int | |
336b517f AD |
1776 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1777 | int *len) | |
3bc3fe5e PM |
1778 | { |
1779 | int ret; | |
1780 | struct compat_ip6t_get_entries get; | |
1781 | struct xt_table *t; | |
1782 | ||
1783 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1784 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1785 | return -EINVAL; |
1786 | } | |
1787 | ||
1788 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1789 | return -EFAULT; | |
1790 | ||
1791 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1792 | duprintf("compat_get_entries: %u != %zu\n", |
1793 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1794 | return -EINVAL; |
1795 | } | |
1796 | ||
1797 | xt_compat_lock(AF_INET6); | |
336b517f | 1798 | t = xt_find_table_lock(net, AF_INET6, get.name); |
0cc8d8df | 1799 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1800 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1801 | struct xt_table_info info; |
9c547959 | 1802 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1803 | ret = compat_table_info(private, &info); |
1804 | if (!ret && get.size == info.size) { | |
1805 | ret = compat_copy_entries_to_user(private->size, | |
1806 | t, uptr->entrytable); | |
1807 | } else if (!ret) { | |
1808 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1809 | private->size, get.size); |
544473c1 | 1810 | ret = -EAGAIN; |
3bc3fe5e PM |
1811 | } |
1812 | xt_compat_flush_offsets(AF_INET6); | |
1813 | module_put(t->me); | |
1814 | xt_table_unlock(t); | |
1815 | } else | |
1816 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1817 | ||
1818 | xt_compat_unlock(AF_INET6); | |
1819 | return ret; | |
1820 | } | |
1821 | ||
1822 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
1823 | ||
1824 | static int | |
1825 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1826 | { | |
1827 | int ret; | |
1828 | ||
af31f412 | 1829 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1830 | return -EPERM; |
1831 | ||
1832 | switch (cmd) { | |
1833 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 1834 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1835 | break; |
1836 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 1837 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
1838 | break; |
1839 | default: | |
1840 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
1841 | } | |
1842 | return ret; | |
1843 | } | |
1844 | #endif | |
1845 | ||
1da177e4 LT |
1846 | static int |
1847 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
1848 | { | |
1849 | int ret; | |
1850 | ||
af31f412 | 1851 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1852 | return -EPERM; |
1853 | ||
1854 | switch (cmd) { | |
1855 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1856 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1857 | break; |
1858 | ||
1859 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1860 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
1861 | break; |
1862 | ||
1863 | default: | |
1864 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1865 | ret = -EINVAL; | |
1866 | } | |
1867 | ||
1868 | return ret; | |
1869 | } | |
1870 | ||
1871 | static int | |
1872 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1873 | { | |
1874 | int ret; | |
1875 | ||
af31f412 | 1876 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1877 | return -EPERM; |
1878 | ||
1879 | switch (cmd) { | |
433665c9 | 1880 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 1881 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 1882 | break; |
1da177e4 | 1883 | |
d924357c | 1884 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 1885 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 1886 | break; |
1da177e4 | 1887 | |
6b7d31fc HW |
1888 | case IP6T_SO_GET_REVISION_MATCH: |
1889 | case IP6T_SO_GET_REVISION_TARGET: { | |
12b00c2c | 1890 | struct xt_get_revision rev; |
2e4e6a17 | 1891 | int target; |
6b7d31fc HW |
1892 | |
1893 | if (*len != sizeof(rev)) { | |
1894 | ret = -EINVAL; | |
1895 | break; | |
1896 | } | |
1897 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1898 | ret = -EFAULT; | |
1899 | break; | |
1900 | } | |
6a8ab060 | 1901 | rev.name[sizeof(rev.name)-1] = 0; |
6b7d31fc HW |
1902 | |
1903 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 1904 | target = 1; |
6b7d31fc | 1905 | else |
2e4e6a17 | 1906 | target = 0; |
6b7d31fc | 1907 | |
2e4e6a17 HW |
1908 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
1909 | rev.revision, | |
1910 | target, &ret), | |
6b7d31fc HW |
1911 | "ip6t_%s", rev.name); |
1912 | break; | |
1913 | } | |
1914 | ||
1da177e4 LT |
1915 | default: |
1916 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
1917 | ret = -EINVAL; | |
1918 | } | |
1919 | ||
1920 | return ret; | |
1921 | } | |
1922 | ||
35aad0ff JE |
1923 | struct xt_table *ip6t_register_table(struct net *net, |
1924 | const struct xt_table *table, | |
336b517f | 1925 | const struct ip6t_replace *repl) |
1da177e4 LT |
1926 | { |
1927 | int ret; | |
2e4e6a17 | 1928 | struct xt_table_info *newinfo; |
f3c5c1bf | 1929 | struct xt_table_info bootstrap = {0}; |
31836064 | 1930 | void *loc_cpu_entry; |
a98da11d | 1931 | struct xt_table *new_table; |
1da177e4 | 1932 | |
2e4e6a17 | 1933 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
1934 | if (!newinfo) { |
1935 | ret = -ENOMEM; | |
1936 | goto out; | |
1937 | } | |
1da177e4 | 1938 | |
9c547959 | 1939 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
1940 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1941 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 1942 | |
0f234214 | 1943 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
1944 | if (ret != 0) |
1945 | goto out_free; | |
1da177e4 | 1946 | |
336b517f | 1947 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 1948 | if (IS_ERR(new_table)) { |
44d34e72 AD |
1949 | ret = PTR_ERR(new_table); |
1950 | goto out_free; | |
1da177e4 | 1951 | } |
44d34e72 | 1952 | return new_table; |
1da177e4 | 1953 | |
44d34e72 AD |
1954 | out_free: |
1955 | xt_free_table_info(newinfo); | |
1956 | out: | |
1957 | return ERR_PTR(ret); | |
1da177e4 LT |
1958 | } |
1959 | ||
f54e9367 | 1960 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 1961 | { |
2e4e6a17 | 1962 | struct xt_table_info *private; |
31836064 | 1963 | void *loc_cpu_entry; |
df200969 | 1964 | struct module *table_owner = table->me; |
72b2b1dd | 1965 | struct ip6t_entry *iter; |
31836064 | 1966 | |
2e4e6a17 | 1967 | private = xt_unregister_table(table); |
1da177e4 LT |
1968 | |
1969 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 1970 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 1971 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 1972 | cleanup_entry(iter, net); |
df200969 AD |
1973 | if (private->number > private->initial_entries) |
1974 | module_put(table_owner); | |
2e4e6a17 | 1975 | xt_free_table_info(private); |
1da177e4 LT |
1976 | } |
1977 | ||
1978 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 1979 | static inline bool |
1da177e4 LT |
1980 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
1981 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 1982 | bool invert) |
1da177e4 LT |
1983 | { |
1984 | return (type == test_type && code >= min_code && code <= max_code) | |
1985 | ^ invert; | |
1986 | } | |
1987 | ||
1d93a9cb | 1988 | static bool |
62fc8051 | 1989 | icmp6_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 1990 | { |
5452e425 JE |
1991 | const struct icmp6hdr *ic; |
1992 | struct icmp6hdr _icmph; | |
f7108a20 | 1993 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
1994 | |
1995 | /* Must not be a fragment. */ | |
f7108a20 | 1996 | if (par->fragoff != 0) |
1d93a9cb | 1997 | return false; |
1da177e4 | 1998 | |
f7108a20 | 1999 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2000 | if (ic == NULL) { |
2001 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2002 | * can't. Hence, no choice but to drop. |
2003 | */ | |
1da177e4 | 2004 | duprintf("Dropping evil ICMP tinygram.\n"); |
b4ba2611 | 2005 | par->hotdrop = true; |
1d93a9cb | 2006 | return false; |
1da177e4 LT |
2007 | } |
2008 | ||
2009 | return icmp6_type_code_match(icmpinfo->type, | |
2010 | icmpinfo->code[0], | |
2011 | icmpinfo->code[1], | |
2012 | ic->icmp6_type, ic->icmp6_code, | |
2013 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2014 | } | |
2015 | ||
2016 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 2017 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2018 | { |
9b4fce7a | 2019 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2020 | |
7f939713 | 2021 | /* Must specify no unknown invflags */ |
bd414ee6 | 2022 | return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2023 | } |
2024 | ||
2025 | /* The built-in targets: standard (NULL) and error. */ | |
4538506b JE |
2026 | static struct xt_target ip6t_builtin_tg[] __read_mostly = { |
2027 | { | |
243bf6e2 | 2028 | .name = XT_STANDARD_TARGET, |
4538506b JE |
2029 | .targetsize = sizeof(int), |
2030 | .family = NFPROTO_IPV6, | |
3bc3fe5e | 2031 | #ifdef CONFIG_COMPAT |
4538506b JE |
2032 | .compatsize = sizeof(compat_int_t), |
2033 | .compat_from_user = compat_standard_from_user, | |
2034 | .compat_to_user = compat_standard_to_user, | |
3bc3fe5e | 2035 | #endif |
4538506b JE |
2036 | }, |
2037 | { | |
243bf6e2 | 2038 | .name = XT_ERROR_TARGET, |
4538506b | 2039 | .target = ip6t_error, |
12b00c2c | 2040 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
2041 | .family = NFPROTO_IPV6, |
2042 | }, | |
1da177e4 LT |
2043 | }; |
2044 | ||
2045 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2046 | .pf = PF_INET6, | |
2047 | .set_optmin = IP6T_BASE_CTL, | |
2048 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2049 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2050 | #ifdef CONFIG_COMPAT |
2051 | .compat_set = compat_do_ip6t_set_ctl, | |
2052 | #endif | |
1da177e4 LT |
2053 | .get_optmin = IP6T_BASE_CTL, |
2054 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2055 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2056 | #ifdef CONFIG_COMPAT |
2057 | .compat_get = compat_do_ip6t_get_ctl, | |
2058 | #endif | |
16fcec35 | 2059 | .owner = THIS_MODULE, |
1da177e4 LT |
2060 | }; |
2061 | ||
4538506b JE |
2062 | static struct xt_match ip6t_builtin_mt[] __read_mostly = { |
2063 | { | |
2064 | .name = "icmp6", | |
2065 | .match = icmp6_match, | |
2066 | .matchsize = sizeof(struct ip6t_icmp), | |
2067 | .checkentry = icmp6_checkentry, | |
2068 | .proto = IPPROTO_ICMPV6, | |
2069 | .family = NFPROTO_IPV6, | |
2070 | }, | |
1da177e4 LT |
2071 | }; |
2072 | ||
3cb609d5 AD |
2073 | static int __net_init ip6_tables_net_init(struct net *net) |
2074 | { | |
383ca5b8 | 2075 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2076 | } |
2077 | ||
2078 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2079 | { | |
383ca5b8 | 2080 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2081 | } |
2082 | ||
2083 | static struct pernet_operations ip6_tables_net_ops = { | |
2084 | .init = ip6_tables_net_init, | |
2085 | .exit = ip6_tables_net_exit, | |
2086 | }; | |
2087 | ||
65b4b4e8 | 2088 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2089 | { |
2090 | int ret; | |
2091 | ||
3cb609d5 | 2092 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2093 | if (ret < 0) |
2094 | goto err1; | |
2e4e6a17 | 2095 | |
25985edc | 2096 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 2097 | ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 PM |
2098 | if (ret < 0) |
2099 | goto err2; | |
4538506b | 2100 | ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 PM |
2101 | if (ret < 0) |
2102 | goto err4; | |
1da177e4 LT |
2103 | |
2104 | /* Register setsockopt */ | |
2105 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2106 | if (ret < 0) |
2107 | goto err5; | |
1da177e4 | 2108 | |
ff67e4e4 | 2109 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2110 | return 0; |
0eff66e6 PM |
2111 | |
2112 | err5: | |
4538506b | 2113 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 | 2114 | err4: |
4538506b | 2115 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 | 2116 | err2: |
3cb609d5 | 2117 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2118 | err1: |
2119 | return ret; | |
1da177e4 LT |
2120 | } |
2121 | ||
65b4b4e8 | 2122 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2123 | { |
2124 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2125 | |
4538506b JE |
2126 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
2127 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); | |
3cb609d5 | 2128 | unregister_pernet_subsys(&ip6_tables_net_ops); |
1da177e4 LT |
2129 | } |
2130 | ||
2131 | EXPORT_SYMBOL(ip6t_register_table); | |
2132 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2133 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2134 | |
65b4b4e8 AM |
2135 | module_init(ip6_tables_init); |
2136 | module_exit(ip6_tables_fini); |