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 | */ |
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 | { |
5452e425 | 286 | const struct ip6t_entry *root; |
4f2f6f23 | 287 | const char *hookname, *chainname, *comment; |
72b2b1dd | 288 | const struct ip6t_entry *iter; |
ba9dda3a | 289 | unsigned int rulenum = 0; |
30e0c6a6 | 290 | struct net *net = dev_net(in ? in : out); |
ba9dda3a | 291 | |
482cfc31 | 292 | root = get_entry(private->entries, private->hook_entry[hook]); |
ba9dda3a | 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 | |
4017a7ee PNA |
302 | nf_log_trace(net, AF_INET6, hook, skb, in, out, &trace_loginfo, |
303 | "TRACE: %s:%s:%s:%u ", | |
304 | tablename, chainname, comment, rulenum); | |
ba9dda3a JK |
305 | } |
306 | #endif | |
307 | ||
6c7941de | 308 | static inline struct ip6t_entry * |
98e86403 JE |
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 | 317 | unsigned int hook, |
8f8a3715 | 318 | const struct nf_hook_state *state, |
fe1cb108 | 319 | struct xt_table *table) |
1da177e4 | 320 | { |
6b7d31fc | 321 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 LT |
322 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
323 | unsigned int verdict = NF_DROP; | |
324 | const char *indev, *outdev; | |
d5d1baa1 | 325 | const void *table_base; |
f3c5c1bf | 326 | struct ip6t_entry *e, **jumpstack; |
7814b6ec | 327 | unsigned int stackidx, cpu; |
d5d1baa1 | 328 | const struct xt_table_info *private; |
de74c169 | 329 | struct xt_action_param acpar; |
7f5c6d4f | 330 | unsigned int addend; |
1da177e4 LT |
331 | |
332 | /* Initialization */ | |
7814b6ec | 333 | stackidx = 0; |
8f8a3715 DM |
334 | indev = state->in ? state->in->name : nulldevname; |
335 | outdev = state->out ? state->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; |
8f8a3715 DM |
343 | acpar.in = state->in; |
344 | acpar.out = state->out; | |
de74c169 JE |
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; |
b416c144 WD |
353 | /* |
354 | * Ensure we load private-> members after we've fetched the base | |
355 | * pointer. | |
356 | */ | |
357 | smp_read_barrier_depends(); | |
f3c5c1bf | 358 | cpu = smp_processor_id(); |
482cfc31 | 359 | table_base = private->entries; |
f3c5c1bf | 360 | jumpstack = (struct ip6t_entry **)private->jumpstack[cpu]; |
7814b6ec FW |
361 | |
362 | /* Switch to alternate jumpstack if we're being invoked via TEE. | |
363 | * TEE issues XT_CONTINUE verdict on original skb so we must not | |
364 | * clobber the jumpstack. | |
365 | * | |
366 | * For recursion via REJECT or SYNPROXY the stack will be clobbered | |
367 | * but it is no problem since absolute verdict is issued by these. | |
368 | */ | |
dcebd315 FW |
369 | if (static_key_false(&xt_tee_enabled)) |
370 | jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated); | |
78454473 | 371 | |
2e4e6a17 | 372 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 373 | |
1da177e4 | 374 | do { |
87a2e70d | 375 | const struct xt_entry_target *t; |
dcea992a | 376 | const struct xt_entry_match *ematch; |
71ae0dff | 377 | struct xt_counters *counter; |
a1ff4ac8 | 378 | |
1da177e4 | 379 | IP_NF_ASSERT(e); |
84018f55 | 380 | acpar.thoff = 0; |
a1ff4ac8 | 381 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
b4ba2611 | 382 | &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) { |
dcea992a | 383 | no_match: |
a1ff4ac8 JE |
384 | e = ip6t_next_entry(e); |
385 | continue; | |
386 | } | |
1da177e4 | 387 | |
ef53d702 | 388 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
389 | acpar.match = ematch->u.kernel.match; |
390 | acpar.matchinfo = ematch->data; | |
391 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 392 | goto no_match; |
ef53d702 | 393 | } |
dcea992a | 394 | |
71ae0dff FW |
395 | counter = xt_get_this_cpu_counter(&e->counters); |
396 | ADD_COUNTER(*counter, skb->len, 1); | |
1da177e4 | 397 | |
d5d1baa1 | 398 | t = ip6t_get_target_c(e); |
a1ff4ac8 | 399 | IP_NF_ASSERT(t->u.kernel.target); |
ba9dda3a | 400 | |
07a93626 | 401 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
402 | /* The packet is traced: log it */ |
403 | if (unlikely(skb->nf_trace)) | |
8f8a3715 | 404 | trace_packet(skb, hook, state->in, state->out, |
a1ff4ac8 | 405 | table->name, private, e); |
ba9dda3a | 406 | #endif |
a1ff4ac8 JE |
407 | /* Standard target? */ |
408 | if (!t->u.kernel.target->target) { | |
409 | int v; | |
410 | ||
87a2e70d | 411 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
412 | if (v < 0) { |
413 | /* Pop from stack? */ | |
243bf6e2 | 414 | if (v != XT_RETURN) { |
95c96174 | 415 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 416 | break; |
1da177e4 | 417 | } |
7814b6ec | 418 | if (stackidx == 0) |
f3c5c1bf JE |
419 | e = get_entry(table_base, |
420 | private->underflow[hook]); | |
421 | else | |
7814b6ec | 422 | e = ip6t_next_entry(jumpstack[--stackidx]); |
a1ff4ac8 JE |
423 | continue; |
424 | } | |
3666ed1c JP |
425 | if (table_base + v != ip6t_next_entry(e) && |
426 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
7814b6ec | 427 | jumpstack[stackidx++] = e; |
a1ff4ac8 | 428 | } |
1da177e4 | 429 | |
a1ff4ac8 | 430 | e = get_entry(table_base, v); |
7a6b1c46 JE |
431 | continue; |
432 | } | |
433 | ||
de74c169 JE |
434 | acpar.target = t->u.kernel.target; |
435 | acpar.targinfo = t->data; | |
7eb35586 | 436 | |
de74c169 | 437 | verdict = t->u.kernel.target->target(skb, &acpar); |
243bf6e2 | 438 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
439 | e = ip6t_next_entry(e); |
440 | else | |
441 | /* Verdict */ | |
442 | break; | |
b4ba2611 | 443 | } while (!acpar.hotdrop); |
1da177e4 | 444 | |
7f5c6d4f ED |
445 | xt_write_recseq_end(addend); |
446 | local_bh_enable(); | |
1da177e4 LT |
447 | |
448 | #ifdef DEBUG_ALLOW_ALL | |
449 | return NF_ACCEPT; | |
450 | #else | |
b4ba2611 | 451 | if (acpar.hotdrop) |
1da177e4 LT |
452 | return NF_DROP; |
453 | else return verdict; | |
454 | #endif | |
455 | } | |
456 | ||
1da177e4 | 457 | /* Figures out from what hook each rule can be called: returns 0 if |
98d1bd80 FW |
458 | * there are loops. Puts hook bitmask in comefrom. |
459 | * | |
460 | * Keeps track of largest call depth seen and stores it in newinfo->stacksize. | |
461 | */ | |
1da177e4 | 462 | static int |
98d1bd80 | 463 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 464 | unsigned int valid_hooks, void *entry0) |
1da177e4 | 465 | { |
98d1bd80 | 466 | unsigned int calldepth, max_calldepth = 0; |
1da177e4 LT |
467 | unsigned int hook; |
468 | ||
469 | /* No recursion; use packet counter to save back ptrs (reset | |
470 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 471 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 472 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 473 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
474 | |
475 | if (!(valid_hooks & (1 << hook))) | |
476 | continue; | |
477 | ||
478 | /* Set initial back pointer. */ | |
479 | e->counters.pcnt = pos; | |
98d1bd80 | 480 | calldepth = 0; |
1da177e4 LT |
481 | |
482 | for (;;) { | |
87a2e70d | 483 | const struct xt_standard_target *t |
d5d1baa1 | 484 | = (void *)ip6t_get_target_c(e); |
9c547959 | 485 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 486 | |
6e23ae2a | 487 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
654d0fbd | 488 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
489 | hook, pos, e->comefrom); |
490 | return 0; | |
491 | } | |
9c547959 | 492 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
493 | |
494 | /* Unconditional return/END. */ | |
3666ed1c JP |
495 | if ((e->target_offset == sizeof(struct ip6t_entry) && |
496 | (strcmp(t->target.u.user.name, | |
243bf6e2 | 497 | XT_STANDARD_TARGET) == 0) && |
3666ed1c JP |
498 | t->verdict < 0 && |
499 | unconditional(&e->ipv6)) || visited) { | |
1da177e4 LT |
500 | unsigned int oldpos, size; |
501 | ||
1f9352ae | 502 | if ((strcmp(t->target.u.user.name, |
243bf6e2 | 503 | XT_STANDARD_TARGET) == 0) && |
1f9352ae | 504 | t->verdict < -NF_MAX_VERDICT - 1) { |
74c9c0c1 DM |
505 | duprintf("mark_source_chains: bad " |
506 | "negative verdict (%i)\n", | |
507 | t->verdict); | |
508 | return 0; | |
509 | } | |
510 | ||
1da177e4 LT |
511 | /* Return: backtrack through the last |
512 | big jump. */ | |
513 | do { | |
6e23ae2a | 514 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
515 | #ifdef DEBUG_IP_FIREWALL_USER |
516 | if (e->comefrom | |
6e23ae2a | 517 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
518 | duprintf("Back unset " |
519 | "on hook %u " | |
520 | "rule %u\n", | |
521 | hook, pos); | |
522 | } | |
523 | #endif | |
524 | oldpos = pos; | |
525 | pos = e->counters.pcnt; | |
526 | e->counters.pcnt = 0; | |
527 | ||
528 | /* We're at the start. */ | |
529 | if (pos == oldpos) | |
530 | goto next; | |
531 | ||
532 | e = (struct ip6t_entry *) | |
31836064 | 533 | (entry0 + pos); |
1da177e4 LT |
534 | } while (oldpos == pos + e->next_offset); |
535 | ||
536 | /* Move along one */ | |
537 | size = e->next_offset; | |
538 | e = (struct ip6t_entry *) | |
31836064 | 539 | (entry0 + pos + size); |
1da177e4 LT |
540 | e->counters.pcnt = pos; |
541 | pos += size; | |
98d1bd80 FW |
542 | if (calldepth > 0) |
543 | --calldepth; | |
1da177e4 LT |
544 | } else { |
545 | int newpos = t->verdict; | |
546 | ||
547 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 548 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 549 | newpos >= 0) { |
74c9c0c1 DM |
550 | if (newpos > newinfo->size - |
551 | sizeof(struct ip6t_entry)) { | |
552 | duprintf("mark_source_chains: " | |
553 | "bad verdict (%i)\n", | |
554 | newpos); | |
555 | return 0; | |
556 | } | |
98d1bd80 FW |
557 | if (entry0 + newpos != ip6t_next_entry(e) && |
558 | !(e->ipv6.flags & IP6T_F_GOTO) && | |
559 | ++calldepth > max_calldepth) | |
560 | max_calldepth = calldepth; | |
561 | ||
1da177e4 LT |
562 | /* This a jump; chase it. */ |
563 | duprintf("Jump rule %u -> %u\n", | |
564 | pos, newpos); | |
565 | } else { | |
566 | /* ... this is a fallthru */ | |
567 | newpos = pos + e->next_offset; | |
568 | } | |
569 | e = (struct ip6t_entry *) | |
31836064 | 570 | (entry0 + newpos); |
1da177e4 LT |
571 | e->counters.pcnt = pos; |
572 | pos = newpos; | |
573 | } | |
574 | } | |
575 | next: | |
576 | duprintf("Finished chain %u\n", hook); | |
577 | } | |
98d1bd80 | 578 | newinfo->stacksize = max_calldepth; |
1da177e4 LT |
579 | return 1; |
580 | } | |
581 | ||
87a2e70d | 582 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 583 | { |
6be3d859 JE |
584 | struct xt_mtdtor_param par; |
585 | ||
f54e9367 | 586 | par.net = net; |
6be3d859 JE |
587 | par.match = m->u.kernel.match; |
588 | par.matchinfo = m->data; | |
916a917d | 589 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
590 | if (par.match->destroy != NULL) |
591 | par.match->destroy(&par); | |
592 | module_put(par.match->me); | |
1da177e4 LT |
593 | } |
594 | ||
022748a9 | 595 | static int |
d5d1baa1 | 596 | check_entry(const struct ip6t_entry *e, const char *name) |
f173c8a1 | 597 | { |
87a2e70d | 598 | const struct xt_entry_target *t; |
f173c8a1 PM |
599 | |
600 | if (!ip6_checkentry(&e->ipv6)) { | |
601 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
602 | return -EINVAL; | |
603 | } | |
604 | ||
87a2e70d | 605 | if (e->target_offset + sizeof(struct xt_entry_target) > |
f173c8a1 PM |
606 | e->next_offset) |
607 | return -EINVAL; | |
608 | ||
d5d1baa1 | 609 | t = ip6t_get_target_c(e); |
f173c8a1 PM |
610 | if (e->target_offset + t->u.target_size > e->next_offset) |
611 | return -EINVAL; | |
612 | ||
613 | return 0; | |
614 | } | |
615 | ||
87a2e70d | 616 | static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
f173c8a1 | 617 | { |
9b4fce7a | 618 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
619 | int ret; |
620 | ||
9b4fce7a JE |
621 | par->match = m->u.kernel.match; |
622 | par->matchinfo = m->data; | |
623 | ||
916a917d | 624 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 625 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
367c6790 | 626 | if (ret < 0) { |
f173c8a1 | 627 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 628 | par.match->name); |
367c6790 | 629 | return ret; |
f173c8a1 | 630 | } |
367c6790 | 631 | return 0; |
f173c8a1 PM |
632 | } |
633 | ||
022748a9 | 634 | static int |
87a2e70d | 635 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 636 | { |
6709dbbb | 637 | struct xt_match *match; |
3cdc7c95 | 638 | int ret; |
1da177e4 | 639 | |
fd0ec0e6 JE |
640 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
641 | m->u.user.revision); | |
642 | if (IS_ERR(match)) { | |
f173c8a1 | 643 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 644 | return PTR_ERR(match); |
1da177e4 LT |
645 | } |
646 | m->u.kernel.match = match; | |
1da177e4 | 647 | |
6bdb331b | 648 | ret = check_match(m, par); |
3cdc7c95 PM |
649 | if (ret) |
650 | goto err; | |
651 | ||
1da177e4 | 652 | return 0; |
3cdc7c95 PM |
653 | err: |
654 | module_put(m->u.kernel.match->me); | |
655 | return ret; | |
1da177e4 LT |
656 | } |
657 | ||
add67461 | 658 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 659 | { |
87a2e70d | 660 | struct xt_entry_target *t = ip6t_get_target(e); |
af5d6dc2 | 661 | struct xt_tgchk_param par = { |
add67461 | 662 | .net = net, |
af5d6dc2 JE |
663 | .table = name, |
664 | .entryinfo = e, | |
665 | .target = t->u.kernel.target, | |
666 | .targinfo = t->data, | |
667 | .hook_mask = e->comefrom, | |
916a917d | 668 | .family = NFPROTO_IPV6, |
af5d6dc2 | 669 | }; |
1da177e4 | 670 | int ret; |
1da177e4 | 671 | |
f173c8a1 | 672 | t = ip6t_get_target(e); |
916a917d | 673 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 674 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
367c6790 | 675 | if (ret < 0) { |
f173c8a1 PM |
676 | duprintf("ip_tables: check failed for `%s'.\n", |
677 | t->u.kernel.target->name); | |
367c6790 | 678 | return ret; |
1da177e4 | 679 | } |
367c6790 | 680 | return 0; |
f173c8a1 | 681 | } |
1da177e4 | 682 | |
022748a9 | 683 | static int |
a83d8e8d | 684 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
0559518b | 685 | unsigned int size) |
f173c8a1 | 686 | { |
87a2e70d | 687 | struct xt_entry_target *t; |
f173c8a1 PM |
688 | struct xt_target *target; |
689 | int ret; | |
690 | unsigned int j; | |
9b4fce7a | 691 | struct xt_mtchk_param mtpar; |
dcea992a | 692 | struct xt_entry_match *ematch; |
f173c8a1 PM |
693 | |
694 | ret = check_entry(e, name); | |
695 | if (ret) | |
696 | return ret; | |
590bdf7f | 697 | |
71ae0dff FW |
698 | e->counters.pcnt = xt_percpu_counter_alloc(); |
699 | if (IS_ERR_VALUE(e->counters.pcnt)) | |
700 | return -ENOMEM; | |
701 | ||
1da177e4 | 702 | j = 0; |
a83d8e8d | 703 | mtpar.net = net; |
9b4fce7a JE |
704 | mtpar.table = name; |
705 | mtpar.entryinfo = &e->ipv6; | |
706 | mtpar.hook_mask = e->comefrom; | |
916a917d | 707 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 708 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 709 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 710 | if (ret != 0) |
6bdb331b JE |
711 | goto cleanup_matches; |
712 | ++j; | |
dcea992a | 713 | } |
1da177e4 LT |
714 | |
715 | t = ip6t_get_target(e); | |
d2a7b6ba JE |
716 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
717 | t->u.user.revision); | |
718 | if (IS_ERR(target)) { | |
f173c8a1 | 719 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 720 | ret = PTR_ERR(target); |
1da177e4 LT |
721 | goto cleanup_matches; |
722 | } | |
723 | t->u.kernel.target = target; | |
6b7d31fc | 724 | |
add67461 | 725 | ret = check_target(e, net, name); |
3cdc7c95 PM |
726 | if (ret) |
727 | goto err; | |
1da177e4 | 728 | return 0; |
3cdc7c95 PM |
729 | err: |
730 | module_put(t->u.kernel.target->me); | |
1da177e4 | 731 | cleanup_matches: |
6bdb331b JE |
732 | xt_ematch_foreach(ematch, e) { |
733 | if (j-- == 0) | |
dcea992a | 734 | break; |
6bdb331b JE |
735 | cleanup_match(ematch, net); |
736 | } | |
71ae0dff FW |
737 | |
738 | xt_percpu_counter_free(e->counters.pcnt); | |
739 | ||
1da177e4 LT |
740 | return ret; |
741 | } | |
742 | ||
d5d1baa1 | 743 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 | 744 | { |
87a2e70d | 745 | const struct xt_entry_target *t; |
e2fe35c1 JE |
746 | unsigned int verdict; |
747 | ||
748 | if (!unconditional(&e->ipv6)) | |
749 | return false; | |
d5d1baa1 | 750 | t = ip6t_get_target_c(e); |
e2fe35c1 JE |
751 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
752 | return false; | |
87a2e70d | 753 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
754 | verdict = -verdict - 1; |
755 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
756 | } | |
757 | ||
022748a9 | 758 | static int |
1da177e4 | 759 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 760 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
761 | const unsigned char *base, |
762 | const unsigned char *limit, | |
1da177e4 LT |
763 | const unsigned int *hook_entries, |
764 | const unsigned int *underflows, | |
0559518b | 765 | unsigned int valid_hooks) |
1da177e4 LT |
766 | { |
767 | unsigned int h; | |
768 | ||
3666ed1c JP |
769 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
770 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { | |
1da177e4 LT |
771 | duprintf("Bad offset %p\n", e); |
772 | return -EINVAL; | |
773 | } | |
774 | ||
775 | if (e->next_offset | |
87a2e70d | 776 | < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) { |
1da177e4 LT |
777 | duprintf("checking: element %p size %u\n", |
778 | e, e->next_offset); | |
779 | return -EINVAL; | |
780 | } | |
781 | ||
782 | /* Check hooks & underflows */ | |
6e23ae2a | 783 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
784 | if (!(valid_hooks & (1 << h))) |
785 | continue; | |
1da177e4 LT |
786 | if ((unsigned char *)e - base == hook_entries[h]) |
787 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 788 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
789 | if (!check_underflow(e)) { |
790 | pr_err("Underflows must be unconditional and " | |
791 | "use the STANDARD target with " | |
792 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
793 | return -EINVAL; |
794 | } | |
1da177e4 | 795 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 796 | } |
1da177e4 LT |
797 | } |
798 | ||
1da177e4 | 799 | /* Clear counters and comefrom */ |
2e4e6a17 | 800 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 801 | e->comefrom = 0; |
1da177e4 LT |
802 | return 0; |
803 | } | |
804 | ||
0559518b | 805 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
1da177e4 | 806 | { |
a2df1648 | 807 | struct xt_tgdtor_param par; |
87a2e70d | 808 | struct xt_entry_target *t; |
dcea992a | 809 | struct xt_entry_match *ematch; |
1da177e4 | 810 | |
1da177e4 | 811 | /* Cleanup all matches */ |
dcea992a | 812 | xt_ematch_foreach(ematch, e) |
6bdb331b | 813 | cleanup_match(ematch, net); |
1da177e4 | 814 | t = ip6t_get_target(e); |
a2df1648 | 815 | |
add67461 | 816 | par.net = net; |
a2df1648 JE |
817 | par.target = t->u.kernel.target; |
818 | par.targinfo = t->data; | |
916a917d | 819 | par.family = NFPROTO_IPV6; |
a2df1648 JE |
820 | if (par.target->destroy != NULL) |
821 | par.target->destroy(&par); | |
822 | module_put(par.target->me); | |
71ae0dff FW |
823 | |
824 | xt_percpu_counter_free(e->counters.pcnt); | |
1da177e4 LT |
825 | } |
826 | ||
827 | /* Checks and translates the user-supplied table segment (held in | |
828 | newinfo) */ | |
829 | static int | |
0f234214 JE |
830 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
831 | const struct ip6t_replace *repl) | |
1da177e4 | 832 | { |
72b2b1dd | 833 | struct ip6t_entry *iter; |
1da177e4 | 834 | unsigned int i; |
72b2b1dd | 835 | int ret = 0; |
1da177e4 | 836 | |
0f234214 JE |
837 | newinfo->size = repl->size; |
838 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
839 | |
840 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 841 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
842 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
843 | newinfo->underflow[i] = 0xFFFFFFFF; | |
844 | } | |
845 | ||
846 | duprintf("translate_table: size %u\n", newinfo->size); | |
847 | i = 0; | |
848 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
849 | xt_entry_foreach(iter, entry0, newinfo->size) { |
850 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
851 | entry0 + repl->size, |
852 | repl->hook_entry, | |
853 | repl->underflow, | |
854 | repl->valid_hooks); | |
72b2b1dd | 855 | if (ret != 0) |
0559518b JE |
856 | return ret; |
857 | ++i; | |
72b2b1dd | 858 | } |
1da177e4 | 859 | |
0f234214 | 860 | if (i != repl->num_entries) { |
1da177e4 | 861 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 862 | i, repl->num_entries); |
1da177e4 LT |
863 | return -EINVAL; |
864 | } | |
865 | ||
866 | /* Check hooks all assigned */ | |
6e23ae2a | 867 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 868 | /* Only hooks which are valid */ |
0f234214 | 869 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
870 | continue; |
871 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
872 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 873 | i, repl->hook_entry[i]); |
1da177e4 LT |
874 | return -EINVAL; |
875 | } | |
876 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
877 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 878 | i, repl->underflow[i]); |
1da177e4 LT |
879 | return -EINVAL; |
880 | } | |
881 | } | |
882 | ||
0f234214 | 883 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
884 | return -ELOOP; |
885 | ||
1da177e4 LT |
886 | /* Finally, each sanity check must pass */ |
887 | i = 0; | |
72b2b1dd | 888 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 889 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
890 | if (ret != 0) |
891 | break; | |
0559518b | 892 | ++i; |
72b2b1dd | 893 | } |
1da177e4 | 894 | |
74c9c0c1 | 895 | if (ret != 0) { |
0559518b JE |
896 | xt_entry_foreach(iter, entry0, newinfo->size) { |
897 | if (i-- == 0) | |
72b2b1dd | 898 | break; |
0559518b JE |
899 | cleanup_entry(iter, net); |
900 | } | |
74c9c0c1 DM |
901 | return ret; |
902 | } | |
1da177e4 | 903 | |
9c547959 | 904 | return ret; |
1da177e4 LT |
905 | } |
906 | ||
1da177e4 | 907 | static void |
2e4e6a17 HW |
908 | get_counters(const struct xt_table_info *t, |
909 | struct xt_counters counters[]) | |
1da177e4 | 910 | { |
72b2b1dd | 911 | struct ip6t_entry *iter; |
1da177e4 LT |
912 | unsigned int cpu; |
913 | unsigned int i; | |
914 | ||
6f912042 | 915 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 916 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 917 | |
1da177e4 | 918 | i = 0; |
482cfc31 | 919 | xt_entry_foreach(iter, t->entries, t->size) { |
71ae0dff | 920 | struct xt_counters *tmp; |
83723d60 ED |
921 | u64 bcnt, pcnt; |
922 | unsigned int start; | |
923 | ||
71ae0dff | 924 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
83723d60 | 925 | do { |
7f5c6d4f | 926 | start = read_seqcount_begin(s); |
71ae0dff FW |
927 | bcnt = tmp->bcnt; |
928 | pcnt = tmp->pcnt; | |
7f5c6d4f | 929 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
930 | |
931 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
932 | ++i; |
933 | } | |
1da177e4 | 934 | } |
78454473 SH |
935 | } |
936 | ||
d5d1baa1 | 937 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 938 | { |
ed1a6f5e | 939 | unsigned int countersize; |
2e4e6a17 | 940 | struct xt_counters *counters; |
d5d1baa1 | 941 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
942 | |
943 | /* We need atomic snapshot of counters: rest doesn't change | |
944 | (other than comefrom, which userspace doesn't care | |
945 | about). */ | |
2e4e6a17 | 946 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 947 | counters = vzalloc(countersize); |
1da177e4 LT |
948 | |
949 | if (counters == NULL) | |
942e4a2b | 950 | return ERR_PTR(-ENOMEM); |
78454473 | 951 | |
942e4a2b | 952 | get_counters(private, counters); |
78454473 | 953 | |
49a88d18 | 954 | return counters; |
ed1a6f5e PM |
955 | } |
956 | ||
957 | static int | |
958 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 959 | const struct xt_table *table, |
ed1a6f5e PM |
960 | void __user *userptr) |
961 | { | |
962 | unsigned int off, num; | |
d5d1baa1 | 963 | const struct ip6t_entry *e; |
ed1a6f5e | 964 | struct xt_counters *counters; |
5452e425 | 965 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 966 | int ret = 0; |
711bdde6 | 967 | const void *loc_cpu_entry; |
ed1a6f5e PM |
968 | |
969 | counters = alloc_counters(table); | |
970 | if (IS_ERR(counters)) | |
971 | return PTR_ERR(counters); | |
972 | ||
482cfc31 | 973 | loc_cpu_entry = private->entries; |
31836064 | 974 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
975 | ret = -EFAULT; |
976 | goto free_counters; | |
977 | } | |
978 | ||
979 | /* FIXME: use iterator macros --RR */ | |
980 | /* ... then go back and fix counters and names */ | |
981 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
982 | unsigned int i; | |
87a2e70d JE |
983 | const struct xt_entry_match *m; |
984 | const struct xt_entry_target *t; | |
1da177e4 | 985 | |
31836064 | 986 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
987 | if (copy_to_user(userptr + off |
988 | + offsetof(struct ip6t_entry, counters), | |
989 | &counters[num], | |
990 | sizeof(counters[num])) != 0) { | |
991 | ret = -EFAULT; | |
992 | goto free_counters; | |
993 | } | |
994 | ||
995 | for (i = sizeof(struct ip6t_entry); | |
996 | i < e->target_offset; | |
997 | i += m->u.match_size) { | |
998 | m = (void *)e + i; | |
999 | ||
1000 | if (copy_to_user(userptr + off + i | |
87a2e70d | 1001 | + offsetof(struct xt_entry_match, |
1da177e4 LT |
1002 | u.user.name), |
1003 | m->u.kernel.match->name, | |
1004 | strlen(m->u.kernel.match->name)+1) | |
1005 | != 0) { | |
1006 | ret = -EFAULT; | |
1007 | goto free_counters; | |
1008 | } | |
1009 | } | |
1010 | ||
d5d1baa1 | 1011 | t = ip6t_get_target_c(e); |
1da177e4 | 1012 | if (copy_to_user(userptr + off + e->target_offset |
87a2e70d | 1013 | + offsetof(struct xt_entry_target, |
1da177e4 LT |
1014 | u.user.name), |
1015 | t->u.kernel.target->name, | |
1016 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1017 | ret = -EFAULT; | |
1018 | goto free_counters; | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | free_counters: | |
1023 | vfree(counters); | |
1024 | return ret; | |
1025 | } | |
1026 | ||
3bc3fe5e | 1027 | #ifdef CONFIG_COMPAT |
739674fb | 1028 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
1029 | { |
1030 | int v = *(compat_int_t *)src; | |
1031 | ||
1032 | if (v > 0) | |
1033 | v += xt_compat_calc_jump(AF_INET6, v); | |
1034 | memcpy(dst, &v, sizeof(v)); | |
1035 | } | |
1036 | ||
739674fb | 1037 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
1038 | { |
1039 | compat_int_t cv = *(int *)src; | |
1040 | ||
1041 | if (cv > 0) | |
1042 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1043 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1044 | } | |
1045 | ||
d5d1baa1 | 1046 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 1047 | const struct xt_table_info *info, |
d5d1baa1 | 1048 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 1049 | { |
dcea992a | 1050 | const struct xt_entry_match *ematch; |
87a2e70d | 1051 | const struct xt_entry_target *t; |
3bc3fe5e PM |
1052 | unsigned int entry_offset; |
1053 | int off, i, ret; | |
1054 | ||
1055 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1056 | entry_offset = (void *)e - base; | |
dcea992a | 1057 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1058 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1059 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
1060 | off += xt_compat_target_offset(t->u.kernel.target); |
1061 | newinfo->size -= off; | |
1062 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1063 | if (ret) | |
1064 | return ret; | |
1065 | ||
1066 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1067 | if (info->hook_entry[i] && | |
1068 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1069 | newinfo->hook_entry[i] -= off; | |
1070 | if (info->underflow[i] && | |
1071 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1072 | newinfo->underflow[i] -= off; | |
1073 | } | |
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | static int compat_table_info(const struct xt_table_info *info, | |
1078 | struct xt_table_info *newinfo) | |
1079 | { | |
72b2b1dd | 1080 | struct ip6t_entry *iter; |
711bdde6 | 1081 | const void *loc_cpu_entry; |
0559518b | 1082 | int ret; |
3bc3fe5e PM |
1083 | |
1084 | if (!newinfo || !info) | |
1085 | return -EINVAL; | |
1086 | ||
482cfc31 | 1087 | /* we dont care about newinfo->entries */ |
3bc3fe5e PM |
1088 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
1089 | newinfo->initial_entries = 0; | |
482cfc31 | 1090 | loc_cpu_entry = info->entries; |
255d0dc3 | 1091 | xt_compat_init_offsets(AF_INET6, info->number); |
72b2b1dd JE |
1092 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1093 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1094 | if (ret != 0) | |
0559518b | 1095 | return ret; |
72b2b1dd | 1096 | } |
0559518b | 1097 | return 0; |
3bc3fe5e PM |
1098 | } |
1099 | #endif | |
1100 | ||
d5d1baa1 JE |
1101 | static int get_info(struct net *net, void __user *user, |
1102 | const int *len, int compat) | |
433665c9 | 1103 | { |
12b00c2c | 1104 | char name[XT_TABLE_MAXNAMELEN]; |
433665c9 PM |
1105 | struct xt_table *t; |
1106 | int ret; | |
1107 | ||
1108 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1109 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1110 | sizeof(struct ip6t_getinfo)); |
1111 | return -EINVAL; | |
1112 | } | |
1113 | ||
1114 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1115 | return -EFAULT; | |
1116 | ||
12b00c2c | 1117 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
3bc3fe5e PM |
1118 | #ifdef CONFIG_COMPAT |
1119 | if (compat) | |
1120 | xt_compat_lock(AF_INET6); | |
1121 | #endif | |
336b517f | 1122 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 | 1123 | "ip6table_%s", name); |
0cc8d8df | 1124 | if (!IS_ERR_OR_NULL(t)) { |
433665c9 | 1125 | struct ip6t_getinfo info; |
5452e425 | 1126 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1127 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1128 | struct xt_table_info tmp; |
1129 | ||
3bc3fe5e | 1130 | if (compat) { |
3bc3fe5e PM |
1131 | ret = compat_table_info(private, &tmp); |
1132 | xt_compat_flush_offsets(AF_INET6); | |
1133 | private = &tmp; | |
1134 | } | |
1135 | #endif | |
cccbe5ef | 1136 | memset(&info, 0, sizeof(info)); |
433665c9 PM |
1137 | info.valid_hooks = t->valid_hooks; |
1138 | memcpy(info.hook_entry, private->hook_entry, | |
1139 | sizeof(info.hook_entry)); | |
1140 | memcpy(info.underflow, private->underflow, | |
1141 | sizeof(info.underflow)); | |
1142 | info.num_entries = private->number; | |
1143 | info.size = private->size; | |
b5dd674b | 1144 | strcpy(info.name, name); |
433665c9 PM |
1145 | |
1146 | if (copy_to_user(user, &info, *len) != 0) | |
1147 | ret = -EFAULT; | |
1148 | else | |
1149 | ret = 0; | |
1150 | ||
1151 | xt_table_unlock(t); | |
1152 | module_put(t->me); | |
1153 | } else | |
1154 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1155 | #ifdef CONFIG_COMPAT |
1156 | if (compat) | |
1157 | xt_compat_unlock(AF_INET6); | |
1158 | #endif | |
433665c9 PM |
1159 | return ret; |
1160 | } | |
1161 | ||
1da177e4 | 1162 | static int |
d5d1baa1 JE |
1163 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
1164 | const int *len) | |
1da177e4 LT |
1165 | { |
1166 | int ret; | |
d924357c | 1167 | struct ip6t_get_entries get; |
2e4e6a17 | 1168 | struct xt_table *t; |
1da177e4 | 1169 | |
d924357c | 1170 | if (*len < sizeof(get)) { |
c9d8fe13 | 1171 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1172 | return -EINVAL; |
1173 | } | |
1174 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1175 | return -EFAULT; | |
1176 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1177 | duprintf("get_entries: %u != %zu\n", |
1178 | *len, sizeof(get) + get.size); | |
d924357c PM |
1179 | return -EINVAL; |
1180 | } | |
1181 | ||
336b517f | 1182 | t = xt_find_table_lock(net, AF_INET6, get.name); |
0cc8d8df | 1183 | if (!IS_ERR_OR_NULL(t)) { |
2e4e6a17 HW |
1184 | struct xt_table_info *private = t->private; |
1185 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1186 | if (get.size == private->size) |
2e4e6a17 | 1187 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1188 | t, uptr->entrytable); |
1189 | else { | |
1190 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1191 | private->size, get.size); |
544473c1 | 1192 | ret = -EAGAIN; |
1da177e4 | 1193 | } |
6b7d31fc | 1194 | module_put(t->me); |
2e4e6a17 | 1195 | xt_table_unlock(t); |
1da177e4 | 1196 | } else |
6b7d31fc | 1197 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1198 | |
1199 | return ret; | |
1200 | } | |
1201 | ||
1202 | static int | |
336b517f | 1203 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1204 | struct xt_table_info *newinfo, unsigned int num_counters, |
1205 | void __user *counters_ptr) | |
1da177e4 LT |
1206 | { |
1207 | int ret; | |
2e4e6a17 | 1208 | struct xt_table *t; |
3bc3fe5e | 1209 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1210 | struct xt_counters *counters; |
72b2b1dd | 1211 | struct ip6t_entry *iter; |
1da177e4 | 1212 | |
3bc3fe5e | 1213 | ret = 0; |
83723d60 | 1214 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
1da177e4 LT |
1215 | if (!counters) { |
1216 | ret = -ENOMEM; | |
3bc3fe5e | 1217 | goto out; |
1da177e4 | 1218 | } |
1da177e4 | 1219 | |
336b517f | 1220 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1221 | "ip6table_%s", name); |
0cc8d8df | 1222 | if (IS_ERR_OR_NULL(t)) { |
6b7d31fc | 1223 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1224 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1225 | } |
1da177e4 LT |
1226 | |
1227 | /* You lied! */ | |
3bc3fe5e | 1228 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1229 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1230 | valid_hooks, t->valid_hooks); |
1da177e4 | 1231 | ret = -EINVAL; |
6b7d31fc | 1232 | goto put_module; |
1da177e4 LT |
1233 | } |
1234 | ||
3bc3fe5e | 1235 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1236 | if (!oldinfo) |
1237 | goto put_module; | |
1238 | ||
1239 | /* Update module usage count based on number of rules */ | |
1240 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1241 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1242 | if ((oldinfo->number > oldinfo->initial_entries) || |
1243 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1244 | module_put(t->me); |
1245 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1246 | (newinfo->number <= oldinfo->initial_entries)) | |
1247 | module_put(t->me); | |
1248 | ||
942e4a2b | 1249 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1250 | get_counters(oldinfo, counters); |
942e4a2b | 1251 | |
1da177e4 | 1252 | /* Decrease module usage counts and free resource */ |
482cfc31 | 1253 | xt_entry_foreach(iter, oldinfo->entries, oldinfo->size) |
0559518b | 1254 | cleanup_entry(iter, net); |
72b2b1dd | 1255 | |
2e4e6a17 | 1256 | xt_free_table_info(oldinfo); |
3bc3fe5e | 1257 | if (copy_to_user(counters_ptr, counters, |
c58dd2dd TG |
1258 | sizeof(struct xt_counters) * num_counters) != 0) { |
1259 | /* Silent error, can't fail, new table is already in place */ | |
1260 | net_warn_ratelimited("ip6tables: counters copy to user failed while replacing table\n"); | |
1261 | } | |
1da177e4 | 1262 | vfree(counters); |
2e4e6a17 | 1263 | xt_table_unlock(t); |
1da177e4 LT |
1264 | return ret; |
1265 | ||
1266 | put_module: | |
1267 | module_put(t->me); | |
2e4e6a17 | 1268 | xt_table_unlock(t); |
1da177e4 | 1269 | free_newinfo_counters_untrans: |
1da177e4 | 1270 | vfree(counters); |
3bc3fe5e PM |
1271 | out: |
1272 | return ret; | |
1273 | } | |
1274 | ||
1275 | static int | |
d5d1baa1 | 1276 | do_replace(struct net *net, const void __user *user, unsigned int len) |
3bc3fe5e PM |
1277 | { |
1278 | int ret; | |
1279 | struct ip6t_replace tmp; | |
1280 | struct xt_table_info *newinfo; | |
1281 | void *loc_cpu_entry; | |
72b2b1dd | 1282 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1283 | |
1284 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1285 | return -EFAULT; | |
1286 | ||
1287 | /* overflow check */ | |
1288 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1289 | return -ENOMEM; | |
1086bbe9 DJ |
1290 | if (tmp.num_counters == 0) |
1291 | return -EINVAL; | |
1292 | ||
6a8ab060 | 1293 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1294 | |
1295 | newinfo = xt_alloc_table_info(tmp.size); | |
1296 | if (!newinfo) | |
1297 | return -ENOMEM; | |
1298 | ||
482cfc31 | 1299 | loc_cpu_entry = newinfo->entries; |
3bc3fe5e PM |
1300 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1301 | tmp.size) != 0) { | |
1302 | ret = -EFAULT; | |
1303 | goto free_newinfo; | |
1304 | } | |
1305 | ||
0f234214 | 1306 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1307 | if (ret != 0) |
1308 | goto free_newinfo; | |
1309 | ||
1310 | duprintf("ip_tables: Translated table\n"); | |
1311 | ||
336b517f | 1312 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1313 | tmp.num_counters, tmp.counters); |
1314 | if (ret) | |
1315 | goto free_newinfo_untrans; | |
1316 | return 0; | |
1317 | ||
1318 | free_newinfo_untrans: | |
72b2b1dd | 1319 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1320 | cleanup_entry(iter, net); |
1da177e4 | 1321 | free_newinfo: |
2e4e6a17 | 1322 | xt_free_table_info(newinfo); |
1da177e4 LT |
1323 | return ret; |
1324 | } | |
1325 | ||
1da177e4 | 1326 | static int |
d5d1baa1 | 1327 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
336b517f | 1328 | int compat) |
1da177e4 | 1329 | { |
482cfc31 | 1330 | unsigned int i; |
3bc3fe5e PM |
1331 | struct xt_counters_info tmp; |
1332 | struct xt_counters *paddc; | |
1333 | unsigned int num_counters; | |
1334 | char *name; | |
1335 | int size; | |
1336 | void *ptmp; | |
2e4e6a17 | 1337 | struct xt_table *t; |
5452e425 | 1338 | const struct xt_table_info *private; |
6b7d31fc | 1339 | int ret = 0; |
72b2b1dd | 1340 | struct ip6t_entry *iter; |
7f5c6d4f | 1341 | unsigned int addend; |
3bc3fe5e PM |
1342 | #ifdef CONFIG_COMPAT |
1343 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1344 | |
3bc3fe5e PM |
1345 | if (compat) { |
1346 | ptmp = &compat_tmp; | |
1347 | size = sizeof(struct compat_xt_counters_info); | |
1348 | } else | |
1349 | #endif | |
1350 | { | |
1351 | ptmp = &tmp; | |
1352 | size = sizeof(struct xt_counters_info); | |
1353 | } | |
1354 | ||
1355 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1356 | return -EFAULT; |
1357 | ||
3bc3fe5e PM |
1358 | #ifdef CONFIG_COMPAT |
1359 | if (compat) { | |
1360 | num_counters = compat_tmp.num_counters; | |
1361 | name = compat_tmp.name; | |
1362 | } else | |
1363 | #endif | |
1364 | { | |
1365 | num_counters = tmp.num_counters; | |
1366 | name = tmp.name; | |
1367 | } | |
1368 | ||
1369 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1370 | return -EINVAL; |
1371 | ||
e12f8e29 | 1372 | paddc = vmalloc(len - size); |
1da177e4 LT |
1373 | if (!paddc) |
1374 | return -ENOMEM; | |
1375 | ||
3bc3fe5e | 1376 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1377 | ret = -EFAULT; |
1378 | goto free; | |
1379 | } | |
1380 | ||
336b517f | 1381 | t = xt_find_table_lock(net, AF_INET6, name); |
0cc8d8df | 1382 | if (IS_ERR_OR_NULL(t)) { |
6b7d31fc | 1383 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1384 | goto free; |
6b7d31fc | 1385 | } |
1da177e4 | 1386 | |
942e4a2b | 1387 | local_bh_disable(); |
2e4e6a17 | 1388 | private = t->private; |
3bc3fe5e | 1389 | if (private->number != num_counters) { |
1da177e4 LT |
1390 | ret = -EINVAL; |
1391 | goto unlock_up_free; | |
1392 | } | |
1393 | ||
1394 | i = 0; | |
7f5c6d4f | 1395 | addend = xt_write_recseq_begin(); |
482cfc31 | 1396 | xt_entry_foreach(iter, private->entries, private->size) { |
71ae0dff FW |
1397 | struct xt_counters *tmp; |
1398 | ||
1399 | tmp = xt_get_this_cpu_counter(&iter->counters); | |
1400 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); | |
0559518b JE |
1401 | ++i; |
1402 | } | |
7f5c6d4f | 1403 | xt_write_recseq_end(addend); |
1da177e4 | 1404 | unlock_up_free: |
942e4a2b | 1405 | local_bh_enable(); |
2e4e6a17 | 1406 | xt_table_unlock(t); |
6b7d31fc | 1407 | module_put(t->me); |
1da177e4 LT |
1408 | free: |
1409 | vfree(paddc); | |
1410 | ||
1411 | return ret; | |
1412 | } | |
1413 | ||
3bc3fe5e PM |
1414 | #ifdef CONFIG_COMPAT |
1415 | struct compat_ip6t_replace { | |
12b00c2c | 1416 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1417 | u32 valid_hooks; |
1418 | u32 num_entries; | |
1419 | u32 size; | |
1420 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1421 | u32 underflow[NF_INET_NUMHOOKS]; | |
1422 | u32 num_counters; | |
87a2e70d | 1423 | compat_uptr_t counters; /* struct xt_counters * */ |
3bc3fe5e PM |
1424 | struct compat_ip6t_entry entries[0]; |
1425 | }; | |
1426 | ||
1427 | static int | |
1428 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1429 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1430 | unsigned int i) |
3bc3fe5e | 1431 | { |
87a2e70d | 1432 | struct xt_entry_target *t; |
3bc3fe5e PM |
1433 | struct compat_ip6t_entry __user *ce; |
1434 | u_int16_t target_offset, next_offset; | |
1435 | compat_uint_t origsize; | |
dcea992a JE |
1436 | const struct xt_entry_match *ematch; |
1437 | int ret = 0; | |
3bc3fe5e | 1438 | |
3bc3fe5e PM |
1439 | origsize = *size; |
1440 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
0559518b JE |
1441 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1442 | copy_to_user(&ce->counters, &counters[i], | |
1443 | sizeof(counters[i])) != 0) | |
1444 | return -EFAULT; | |
3bc3fe5e PM |
1445 | |
1446 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1447 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1448 | ||
dcea992a JE |
1449 | xt_ematch_foreach(ematch, e) { |
1450 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1451 | if (ret != 0) | |
6bdb331b | 1452 | return ret; |
dcea992a | 1453 | } |
3bc3fe5e | 1454 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1455 | t = ip6t_get_target(e); |
1456 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1457 | if (ret) | |
0559518b | 1458 | return ret; |
3bc3fe5e | 1459 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1460 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1461 | put_user(next_offset, &ce->next_offset) != 0) | |
1462 | return -EFAULT; | |
3bc3fe5e | 1463 | return 0; |
3bc3fe5e PM |
1464 | } |
1465 | ||
022748a9 | 1466 | static int |
87a2e70d | 1467 | compat_find_calc_match(struct xt_entry_match *m, |
3bc3fe5e PM |
1468 | const char *name, |
1469 | const struct ip6t_ip6 *ipv6, | |
6bdb331b | 1470 | int *size) |
3bc3fe5e PM |
1471 | { |
1472 | struct xt_match *match; | |
1473 | ||
fd0ec0e6 JE |
1474 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
1475 | m->u.user.revision); | |
1476 | if (IS_ERR(match)) { | |
3bc3fe5e PM |
1477 | duprintf("compat_check_calc_match: `%s' not found\n", |
1478 | m->u.user.name); | |
fd0ec0e6 | 1479 | return PTR_ERR(match); |
3bc3fe5e PM |
1480 | } |
1481 | m->u.kernel.match = match; | |
1482 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1483 | return 0; |
1484 | } | |
1485 | ||
0559518b | 1486 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e | 1487 | { |
87a2e70d | 1488 | struct xt_entry_target *t; |
dcea992a | 1489 | struct xt_entry_match *ematch; |
3bc3fe5e | 1490 | |
3bc3fe5e | 1491 | /* Cleanup all matches */ |
dcea992a | 1492 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1493 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1494 | t = compat_ip6t_get_target(e); |
1495 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1496 | } |
1497 | ||
022748a9 | 1498 | static int |
3bc3fe5e PM |
1499 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1500 | struct xt_table_info *newinfo, | |
1501 | unsigned int *size, | |
d5d1baa1 JE |
1502 | const unsigned char *base, |
1503 | const unsigned char *limit, | |
1504 | const unsigned int *hook_entries, | |
1505 | const unsigned int *underflows, | |
3bc3fe5e PM |
1506 | const char *name) |
1507 | { | |
dcea992a | 1508 | struct xt_entry_match *ematch; |
87a2e70d | 1509 | struct xt_entry_target *t; |
3bc3fe5e PM |
1510 | struct xt_target *target; |
1511 | unsigned int entry_offset; | |
b0a6363c PM |
1512 | unsigned int j; |
1513 | int ret, off, h; | |
3bc3fe5e PM |
1514 | |
1515 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1516 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
1517 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
3bc3fe5e PM |
1518 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1519 | return -EINVAL; | |
1520 | } | |
1521 | ||
1522 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1523 | sizeof(struct compat_xt_entry_target)) { | |
1524 | duprintf("checking: element %p size %u\n", | |
1525 | e, e->next_offset); | |
1526 | return -EINVAL; | |
1527 | } | |
1528 | ||
1529 | /* For purposes of check_entry casting the compat entry is fine */ | |
1530 | ret = check_entry((struct ip6t_entry *)e, name); | |
1531 | if (ret) | |
1532 | return ret; | |
1533 | ||
1534 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1535 | entry_offset = (void *)e - (void *)base; | |
1536 | j = 0; | |
dcea992a | 1537 | xt_ematch_foreach(ematch, e) { |
2f06550b | 1538 | ret = compat_find_calc_match(ematch, name, &e->ipv6, &off); |
dcea992a | 1539 | if (ret != 0) |
6bdb331b JE |
1540 | goto release_matches; |
1541 | ++j; | |
dcea992a | 1542 | } |
3bc3fe5e PM |
1543 | |
1544 | t = compat_ip6t_get_target(e); | |
d2a7b6ba JE |
1545 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
1546 | t->u.user.revision); | |
1547 | if (IS_ERR(target)) { | |
3bc3fe5e PM |
1548 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
1549 | t->u.user.name); | |
d2a7b6ba | 1550 | ret = PTR_ERR(target); |
3bc3fe5e PM |
1551 | goto release_matches; |
1552 | } | |
1553 | t->u.kernel.target = target; | |
1554 | ||
1555 | off += xt_compat_target_offset(target); | |
1556 | *size += off; | |
1557 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1558 | if (ret) | |
1559 | goto out; | |
1560 | ||
1561 | /* Check hooks & underflows */ | |
1562 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1563 | if ((unsigned char *)e - base == hook_entries[h]) | |
1564 | newinfo->hook_entry[h] = hook_entries[h]; | |
1565 | if ((unsigned char *)e - base == underflows[h]) | |
1566 | newinfo->underflow[h] = underflows[h]; | |
1567 | } | |
1568 | ||
1569 | /* Clear counters and comefrom */ | |
1570 | memset(&e->counters, 0, sizeof(e->counters)); | |
1571 | e->comefrom = 0; | |
3bc3fe5e PM |
1572 | return 0; |
1573 | ||
1574 | out: | |
1575 | module_put(t->u.kernel.target->me); | |
1576 | release_matches: | |
6bdb331b JE |
1577 | xt_ematch_foreach(ematch, e) { |
1578 | if (j-- == 0) | |
dcea992a | 1579 | break; |
6bdb331b JE |
1580 | module_put(ematch->u.kernel.match->me); |
1581 | } | |
3bc3fe5e PM |
1582 | return ret; |
1583 | } | |
1584 | ||
1585 | static int | |
1586 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1587 | unsigned int *size, const char *name, | |
1588 | struct xt_table_info *newinfo, unsigned char *base) | |
1589 | { | |
87a2e70d | 1590 | struct xt_entry_target *t; |
3bc3fe5e PM |
1591 | struct ip6t_entry *de; |
1592 | unsigned int origsize; | |
1593 | int ret, h; | |
dcea992a | 1594 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1595 | |
1596 | ret = 0; | |
1597 | origsize = *size; | |
1598 | de = (struct ip6t_entry *)*dstptr; | |
1599 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1600 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1601 | ||
1602 | *dstptr += sizeof(struct ip6t_entry); | |
1603 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1604 | ||
dcea992a JE |
1605 | xt_ematch_foreach(ematch, e) { |
1606 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1607 | if (ret != 0) | |
6bdb331b | 1608 | return ret; |
dcea992a | 1609 | } |
3bc3fe5e PM |
1610 | de->target_offset = e->target_offset - (origsize - *size); |
1611 | t = compat_ip6t_get_target(e); | |
3bc3fe5e PM |
1612 | xt_compat_target_from_user(t, dstptr, size); |
1613 | ||
1614 | de->next_offset = e->next_offset - (origsize - *size); | |
1615 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1616 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1617 | newinfo->hook_entry[h] -= origsize - *size; | |
1618 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1619 | newinfo->underflow[h] -= origsize - *size; | |
1620 | } | |
1621 | return ret; | |
1622 | } | |
1623 | ||
f54e9367 | 1624 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
0559518b | 1625 | const char *name) |
3bc3fe5e | 1626 | { |
b0a6363c | 1627 | unsigned int j; |
dcea992a | 1628 | int ret = 0; |
9b4fce7a | 1629 | struct xt_mtchk_param mtpar; |
dcea992a | 1630 | struct xt_entry_match *ematch; |
3bc3fe5e | 1631 | |
71ae0dff FW |
1632 | e->counters.pcnt = xt_percpu_counter_alloc(); |
1633 | if (IS_ERR_VALUE(e->counters.pcnt)) | |
1634 | return -ENOMEM; | |
3bc3fe5e | 1635 | j = 0; |
f54e9367 | 1636 | mtpar.net = net; |
9b4fce7a JE |
1637 | mtpar.table = name; |
1638 | mtpar.entryinfo = &e->ipv6; | |
1639 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1640 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 1641 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1642 | ret = check_match(ematch, &mtpar); |
dcea992a | 1643 | if (ret != 0) |
6bdb331b JE |
1644 | goto cleanup_matches; |
1645 | ++j; | |
dcea992a | 1646 | } |
3bc3fe5e | 1647 | |
add67461 | 1648 | ret = check_target(e, net, name); |
3bc3fe5e PM |
1649 | if (ret) |
1650 | goto cleanup_matches; | |
3bc3fe5e PM |
1651 | return 0; |
1652 | ||
1653 | cleanup_matches: | |
6bdb331b JE |
1654 | xt_ematch_foreach(ematch, e) { |
1655 | if (j-- == 0) | |
dcea992a | 1656 | break; |
6bdb331b JE |
1657 | cleanup_match(ematch, net); |
1658 | } | |
71ae0dff FW |
1659 | |
1660 | xt_percpu_counter_free(e->counters.pcnt); | |
1661 | ||
3bc3fe5e PM |
1662 | return ret; |
1663 | } | |
1664 | ||
1665 | static int | |
f54e9367 AD |
1666 | translate_compat_table(struct net *net, |
1667 | const char *name, | |
3bc3fe5e PM |
1668 | unsigned int valid_hooks, |
1669 | struct xt_table_info **pinfo, | |
1670 | void **pentry0, | |
1671 | unsigned int total_size, | |
1672 | unsigned int number, | |
1673 | unsigned int *hook_entries, | |
1674 | unsigned int *underflows) | |
1675 | { | |
1676 | unsigned int i, j; | |
1677 | struct xt_table_info *newinfo, *info; | |
1678 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1679 | struct compat_ip6t_entry *iter0; |
1680 | struct ip6t_entry *iter1; | |
3bc3fe5e | 1681 | unsigned int size; |
72b2b1dd | 1682 | int ret = 0; |
3bc3fe5e PM |
1683 | |
1684 | info = *pinfo; | |
1685 | entry0 = *pentry0; | |
1686 | size = total_size; | |
1687 | info->number = number; | |
1688 | ||
1689 | /* Init all hooks to impossible value. */ | |
1690 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1691 | info->hook_entry[i] = 0xFFFFFFFF; | |
1692 | info->underflow[i] = 0xFFFFFFFF; | |
1693 | } | |
1694 | ||
1695 | duprintf("translate_compat_table: size %u\n", info->size); | |
1696 | j = 0; | |
1697 | xt_compat_lock(AF_INET6); | |
255d0dc3 | 1698 | xt_compat_init_offsets(AF_INET6, number); |
3bc3fe5e | 1699 | /* Walk through entries, checking offsets. */ |
72b2b1dd JE |
1700 | xt_entry_foreach(iter0, entry0, total_size) { |
1701 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1702 | entry0, |
1703 | entry0 + total_size, | |
1704 | hook_entries, | |
1705 | underflows, | |
1706 | name); | |
72b2b1dd | 1707 | if (ret != 0) |
0559518b JE |
1708 | goto out_unlock; |
1709 | ++j; | |
72b2b1dd | 1710 | } |
3bc3fe5e PM |
1711 | |
1712 | ret = -EINVAL; | |
1713 | if (j != number) { | |
1714 | duprintf("translate_compat_table: %u not %u entries\n", | |
1715 | j, number); | |
1716 | goto out_unlock; | |
1717 | } | |
1718 | ||
1719 | /* Check hooks all assigned */ | |
1720 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1721 | /* Only hooks which are valid */ | |
1722 | if (!(valid_hooks & (1 << i))) | |
1723 | continue; | |
1724 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1725 | duprintf("Invalid hook entry %u %u\n", | |
1726 | i, hook_entries[i]); | |
1727 | goto out_unlock; | |
1728 | } | |
1729 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1730 | duprintf("Invalid underflow %u %u\n", | |
1731 | i, underflows[i]); | |
1732 | goto out_unlock; | |
1733 | } | |
1734 | } | |
1735 | ||
1736 | ret = -ENOMEM; | |
1737 | newinfo = xt_alloc_table_info(size); | |
1738 | if (!newinfo) | |
1739 | goto out_unlock; | |
1740 | ||
1741 | newinfo->number = number; | |
1742 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1743 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1744 | newinfo->underflow[i] = info->underflow[i]; | |
1745 | } | |
482cfc31 | 1746 | entry1 = newinfo->entries; |
3bc3fe5e PM |
1747 | pos = entry1; |
1748 | size = total_size; | |
72b2b1dd | 1749 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1750 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1751 | name, newinfo, entry1); | |
72b2b1dd JE |
1752 | if (ret != 0) |
1753 | break; | |
1754 | } | |
3bc3fe5e PM |
1755 | xt_compat_flush_offsets(AF_INET6); |
1756 | xt_compat_unlock(AF_INET6); | |
1757 | if (ret) | |
1758 | goto free_newinfo; | |
1759 | ||
1760 | ret = -ELOOP; | |
1761 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1762 | goto free_newinfo; | |
1763 | ||
1764 | i = 0; | |
72b2b1dd | 1765 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1766 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1767 | if (ret != 0) |
1768 | break; | |
0559518b | 1769 | ++i; |
72b2b1dd | 1770 | } |
3bc3fe5e | 1771 | if (ret) { |
72b2b1dd JE |
1772 | /* |
1773 | * The first i matches need cleanup_entry (calls ->destroy) | |
1774 | * because they had called ->check already. The other j-i | |
1775 | * entries need only release. | |
1776 | */ | |
1777 | int skip = i; | |
3bc3fe5e | 1778 | j -= i; |
72b2b1dd JE |
1779 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1780 | if (skip-- > 0) | |
1781 | continue; | |
0559518b | 1782 | if (j-- == 0) |
72b2b1dd | 1783 | break; |
0559518b | 1784 | compat_release_entry(iter0); |
72b2b1dd | 1785 | } |
0559518b JE |
1786 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1787 | if (i-- == 0) | |
72b2b1dd | 1788 | break; |
0559518b JE |
1789 | cleanup_entry(iter1, net); |
1790 | } | |
3bc3fe5e PM |
1791 | xt_free_table_info(newinfo); |
1792 | return ret; | |
1793 | } | |
1794 | ||
3bc3fe5e PM |
1795 | *pinfo = newinfo; |
1796 | *pentry0 = entry1; | |
1797 | xt_free_table_info(info); | |
1798 | return 0; | |
1799 | ||
1800 | free_newinfo: | |
1801 | xt_free_table_info(newinfo); | |
1802 | out: | |
0559518b JE |
1803 | xt_entry_foreach(iter0, entry0, total_size) { |
1804 | if (j-- == 0) | |
72b2b1dd | 1805 | break; |
0559518b JE |
1806 | compat_release_entry(iter0); |
1807 | } | |
3bc3fe5e PM |
1808 | return ret; |
1809 | out_unlock: | |
1810 | xt_compat_flush_offsets(AF_INET6); | |
1811 | xt_compat_unlock(AF_INET6); | |
1812 | goto out; | |
1813 | } | |
1814 | ||
1815 | static int | |
336b517f | 1816 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1817 | { |
1818 | int ret; | |
1819 | struct compat_ip6t_replace tmp; | |
1820 | struct xt_table_info *newinfo; | |
1821 | void *loc_cpu_entry; | |
72b2b1dd | 1822 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1823 | |
1824 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1825 | return -EFAULT; | |
1826 | ||
1827 | /* overflow check */ | |
1828 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1829 | return -ENOMEM; | |
1830 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1831 | return -ENOMEM; | |
1086bbe9 DJ |
1832 | if (tmp.num_counters == 0) |
1833 | return -EINVAL; | |
1834 | ||
6a8ab060 | 1835 | tmp.name[sizeof(tmp.name)-1] = 0; |
3bc3fe5e PM |
1836 | |
1837 | newinfo = xt_alloc_table_info(tmp.size); | |
1838 | if (!newinfo) | |
1839 | return -ENOMEM; | |
1840 | ||
482cfc31 | 1841 | loc_cpu_entry = newinfo->entries; |
3bc3fe5e PM |
1842 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1843 | tmp.size) != 0) { | |
1844 | ret = -EFAULT; | |
1845 | goto free_newinfo; | |
1846 | } | |
1847 | ||
f54e9367 | 1848 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1849 | &newinfo, &loc_cpu_entry, tmp.size, |
1850 | tmp.num_entries, tmp.hook_entry, | |
1851 | tmp.underflow); | |
1852 | if (ret != 0) | |
1853 | goto free_newinfo; | |
1854 | ||
1855 | duprintf("compat_do_replace: Translated table\n"); | |
1856 | ||
336b517f | 1857 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1858 | tmp.num_counters, compat_ptr(tmp.counters)); |
1859 | if (ret) | |
1860 | goto free_newinfo_untrans; | |
1861 | return 0; | |
1862 | ||
1863 | free_newinfo_untrans: | |
72b2b1dd | 1864 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1865 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1866 | free_newinfo: |
1867 | xt_free_table_info(newinfo); | |
1868 | return ret; | |
1869 | } | |
1870 | ||
1871 | static int | |
1872 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1873 | unsigned int len) | |
1874 | { | |
1875 | int ret; | |
1876 | ||
af31f412 | 1877 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1878 | return -EPERM; |
1879 | ||
1880 | switch (cmd) { | |
1881 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1882 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1883 | break; |
1884 | ||
1885 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1886 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1887 | break; |
1888 | ||
1889 | default: | |
1890 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1891 | ret = -EINVAL; | |
1892 | } | |
1893 | ||
1894 | return ret; | |
1895 | } | |
1896 | ||
1897 | struct compat_ip6t_get_entries { | |
12b00c2c | 1898 | char name[XT_TABLE_MAXNAMELEN]; |
3bc3fe5e PM |
1899 | compat_uint_t size; |
1900 | struct compat_ip6t_entry entrytable[0]; | |
1901 | }; | |
1902 | ||
1903 | static int | |
1904 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1905 | void __user *userptr) | |
1906 | { | |
1907 | struct xt_counters *counters; | |
5452e425 | 1908 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1909 | void __user *pos; |
1910 | unsigned int size; | |
1911 | int ret = 0; | |
3bc3fe5e | 1912 | unsigned int i = 0; |
72b2b1dd | 1913 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1914 | |
1915 | counters = alloc_counters(table); | |
1916 | if (IS_ERR(counters)) | |
1917 | return PTR_ERR(counters); | |
1918 | ||
3bc3fe5e PM |
1919 | pos = userptr; |
1920 | size = total_size; | |
482cfc31 | 1921 | xt_entry_foreach(iter, private->entries, total_size) { |
72b2b1dd | 1922 | ret = compat_copy_entry_to_user(iter, &pos, |
6b4ff2d7 | 1923 | &size, counters, i++); |
72b2b1dd JE |
1924 | if (ret != 0) |
1925 | break; | |
1926 | } | |
3bc3fe5e PM |
1927 | |
1928 | vfree(counters); | |
1929 | return ret; | |
1930 | } | |
1931 | ||
1932 | static int | |
336b517f AD |
1933 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1934 | int *len) | |
3bc3fe5e PM |
1935 | { |
1936 | int ret; | |
1937 | struct compat_ip6t_get_entries get; | |
1938 | struct xt_table *t; | |
1939 | ||
1940 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1941 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1942 | return -EINVAL; |
1943 | } | |
1944 | ||
1945 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1946 | return -EFAULT; | |
1947 | ||
1948 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1949 | duprintf("compat_get_entries: %u != %zu\n", |
1950 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1951 | return -EINVAL; |
1952 | } | |
1953 | ||
1954 | xt_compat_lock(AF_INET6); | |
336b517f | 1955 | t = xt_find_table_lock(net, AF_INET6, get.name); |
0cc8d8df | 1956 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1957 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1958 | struct xt_table_info info; |
9c547959 | 1959 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1960 | ret = compat_table_info(private, &info); |
1961 | if (!ret && get.size == info.size) { | |
1962 | ret = compat_copy_entries_to_user(private->size, | |
1963 | t, uptr->entrytable); | |
1964 | } else if (!ret) { | |
1965 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1966 | private->size, get.size); |
544473c1 | 1967 | ret = -EAGAIN; |
3bc3fe5e PM |
1968 | } |
1969 | xt_compat_flush_offsets(AF_INET6); | |
1970 | module_put(t->me); | |
1971 | xt_table_unlock(t); | |
1972 | } else | |
1973 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1974 | ||
1975 | xt_compat_unlock(AF_INET6); | |
1976 | return ret; | |
1977 | } | |
1978 | ||
1979 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
1980 | ||
1981 | static int | |
1982 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1983 | { | |
1984 | int ret; | |
1985 | ||
af31f412 | 1986 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
3bc3fe5e PM |
1987 | return -EPERM; |
1988 | ||
1989 | switch (cmd) { | |
1990 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 1991 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1992 | break; |
1993 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 1994 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
1995 | break; |
1996 | default: | |
1997 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
1998 | } | |
1999 | return ret; | |
2000 | } | |
2001 | #endif | |
2002 | ||
1da177e4 LT |
2003 | static int |
2004 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2005 | { | |
2006 | int ret; | |
2007 | ||
af31f412 | 2008 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2009 | return -EPERM; |
2010 | ||
2011 | switch (cmd) { | |
2012 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2013 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2014 | break; |
2015 | ||
2016 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2017 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2018 | break; |
2019 | ||
2020 | default: | |
2021 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2022 | ret = -EINVAL; | |
2023 | } | |
2024 | ||
2025 | return ret; | |
2026 | } | |
2027 | ||
2028 | static int | |
2029 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2030 | { | |
2031 | int ret; | |
2032 | ||
af31f412 | 2033 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2034 | return -EPERM; |
2035 | ||
2036 | switch (cmd) { | |
433665c9 | 2037 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2038 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2039 | break; |
1da177e4 | 2040 | |
d924357c | 2041 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2042 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2043 | break; |
1da177e4 | 2044 | |
6b7d31fc HW |
2045 | case IP6T_SO_GET_REVISION_MATCH: |
2046 | case IP6T_SO_GET_REVISION_TARGET: { | |
12b00c2c | 2047 | struct xt_get_revision rev; |
2e4e6a17 | 2048 | int target; |
6b7d31fc HW |
2049 | |
2050 | if (*len != sizeof(rev)) { | |
2051 | ret = -EINVAL; | |
2052 | break; | |
2053 | } | |
2054 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2055 | ret = -EFAULT; | |
2056 | break; | |
2057 | } | |
6a8ab060 | 2058 | rev.name[sizeof(rev.name)-1] = 0; |
6b7d31fc HW |
2059 | |
2060 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2061 | target = 1; |
6b7d31fc | 2062 | else |
2e4e6a17 | 2063 | target = 0; |
6b7d31fc | 2064 | |
2e4e6a17 HW |
2065 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2066 | rev.revision, | |
2067 | target, &ret), | |
6b7d31fc HW |
2068 | "ip6t_%s", rev.name); |
2069 | break; | |
2070 | } | |
2071 | ||
1da177e4 LT |
2072 | default: |
2073 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2074 | ret = -EINVAL; | |
2075 | } | |
2076 | ||
2077 | return ret; | |
2078 | } | |
2079 | ||
35aad0ff JE |
2080 | struct xt_table *ip6t_register_table(struct net *net, |
2081 | const struct xt_table *table, | |
336b517f | 2082 | const struct ip6t_replace *repl) |
1da177e4 LT |
2083 | { |
2084 | int ret; | |
2e4e6a17 | 2085 | struct xt_table_info *newinfo; |
f3c5c1bf | 2086 | struct xt_table_info bootstrap = {0}; |
31836064 | 2087 | void *loc_cpu_entry; |
a98da11d | 2088 | struct xt_table *new_table; |
1da177e4 | 2089 | |
2e4e6a17 | 2090 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2091 | if (!newinfo) { |
2092 | ret = -ENOMEM; | |
2093 | goto out; | |
2094 | } | |
1da177e4 | 2095 | |
482cfc31 | 2096 | loc_cpu_entry = newinfo->entries; |
31836064 | 2097 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
1da177e4 | 2098 | |
0f234214 | 2099 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2100 | if (ret != 0) |
2101 | goto out_free; | |
1da177e4 | 2102 | |
336b517f | 2103 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2104 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2105 | ret = PTR_ERR(new_table); |
2106 | goto out_free; | |
1da177e4 | 2107 | } |
44d34e72 | 2108 | return new_table; |
1da177e4 | 2109 | |
44d34e72 AD |
2110 | out_free: |
2111 | xt_free_table_info(newinfo); | |
2112 | out: | |
2113 | return ERR_PTR(ret); | |
1da177e4 LT |
2114 | } |
2115 | ||
f54e9367 | 2116 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2117 | { |
2e4e6a17 | 2118 | struct xt_table_info *private; |
31836064 | 2119 | void *loc_cpu_entry; |
df200969 | 2120 | struct module *table_owner = table->me; |
72b2b1dd | 2121 | struct ip6t_entry *iter; |
31836064 | 2122 | |
2e4e6a17 | 2123 | private = xt_unregister_table(table); |
1da177e4 LT |
2124 | |
2125 | /* Decrease module usage counts and free resources */ | |
482cfc31 | 2126 | loc_cpu_entry = private->entries; |
72b2b1dd | 2127 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2128 | cleanup_entry(iter, net); |
df200969 AD |
2129 | if (private->number > private->initial_entries) |
2130 | module_put(table_owner); | |
2e4e6a17 | 2131 | xt_free_table_info(private); |
1da177e4 LT |
2132 | } |
2133 | ||
2134 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2135 | static inline bool |
1da177e4 LT |
2136 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2137 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2138 | bool invert) |
1da177e4 LT |
2139 | { |
2140 | return (type == test_type && code >= min_code && code <= max_code) | |
2141 | ^ invert; | |
2142 | } | |
2143 | ||
1d93a9cb | 2144 | static bool |
62fc8051 | 2145 | icmp6_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2146 | { |
5452e425 JE |
2147 | const struct icmp6hdr *ic; |
2148 | struct icmp6hdr _icmph; | |
f7108a20 | 2149 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2150 | |
2151 | /* Must not be a fragment. */ | |
f7108a20 | 2152 | if (par->fragoff != 0) |
1d93a9cb | 2153 | return false; |
1da177e4 | 2154 | |
f7108a20 | 2155 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2156 | if (ic == NULL) { |
2157 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2158 | * can't. Hence, no choice but to drop. |
2159 | */ | |
1da177e4 | 2160 | duprintf("Dropping evil ICMP tinygram.\n"); |
b4ba2611 | 2161 | par->hotdrop = true; |
1d93a9cb | 2162 | return false; |
1da177e4 LT |
2163 | } |
2164 | ||
2165 | return icmp6_type_code_match(icmpinfo->type, | |
2166 | icmpinfo->code[0], | |
2167 | icmpinfo->code[1], | |
2168 | ic->icmp6_type, ic->icmp6_code, | |
2169 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2170 | } | |
2171 | ||
2172 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 2173 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2174 | { |
9b4fce7a | 2175 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2176 | |
7f939713 | 2177 | /* Must specify no unknown invflags */ |
bd414ee6 | 2178 | return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2179 | } |
2180 | ||
2181 | /* The built-in targets: standard (NULL) and error. */ | |
4538506b JE |
2182 | static struct xt_target ip6t_builtin_tg[] __read_mostly = { |
2183 | { | |
243bf6e2 | 2184 | .name = XT_STANDARD_TARGET, |
4538506b JE |
2185 | .targetsize = sizeof(int), |
2186 | .family = NFPROTO_IPV6, | |
3bc3fe5e | 2187 | #ifdef CONFIG_COMPAT |
4538506b JE |
2188 | .compatsize = sizeof(compat_int_t), |
2189 | .compat_from_user = compat_standard_from_user, | |
2190 | .compat_to_user = compat_standard_to_user, | |
3bc3fe5e | 2191 | #endif |
4538506b JE |
2192 | }, |
2193 | { | |
243bf6e2 | 2194 | .name = XT_ERROR_TARGET, |
4538506b | 2195 | .target = ip6t_error, |
12b00c2c | 2196 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
2197 | .family = NFPROTO_IPV6, |
2198 | }, | |
1da177e4 LT |
2199 | }; |
2200 | ||
2201 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2202 | .pf = PF_INET6, | |
2203 | .set_optmin = IP6T_BASE_CTL, | |
2204 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2205 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2206 | #ifdef CONFIG_COMPAT |
2207 | .compat_set = compat_do_ip6t_set_ctl, | |
2208 | #endif | |
1da177e4 LT |
2209 | .get_optmin = IP6T_BASE_CTL, |
2210 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2211 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2212 | #ifdef CONFIG_COMPAT |
2213 | .compat_get = compat_do_ip6t_get_ctl, | |
2214 | #endif | |
16fcec35 | 2215 | .owner = THIS_MODULE, |
1da177e4 LT |
2216 | }; |
2217 | ||
4538506b JE |
2218 | static struct xt_match ip6t_builtin_mt[] __read_mostly = { |
2219 | { | |
2220 | .name = "icmp6", | |
2221 | .match = icmp6_match, | |
2222 | .matchsize = sizeof(struct ip6t_icmp), | |
2223 | .checkentry = icmp6_checkentry, | |
2224 | .proto = IPPROTO_ICMPV6, | |
2225 | .family = NFPROTO_IPV6, | |
2226 | }, | |
1da177e4 LT |
2227 | }; |
2228 | ||
3cb609d5 AD |
2229 | static int __net_init ip6_tables_net_init(struct net *net) |
2230 | { | |
383ca5b8 | 2231 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2232 | } |
2233 | ||
2234 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2235 | { | |
383ca5b8 | 2236 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2237 | } |
2238 | ||
2239 | static struct pernet_operations ip6_tables_net_ops = { | |
2240 | .init = ip6_tables_net_init, | |
2241 | .exit = ip6_tables_net_exit, | |
2242 | }; | |
2243 | ||
65b4b4e8 | 2244 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2245 | { |
2246 | int ret; | |
2247 | ||
3cb609d5 | 2248 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2249 | if (ret < 0) |
2250 | goto err1; | |
2e4e6a17 | 2251 | |
25985edc | 2252 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 2253 | ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 PM |
2254 | if (ret < 0) |
2255 | goto err2; | |
4538506b | 2256 | ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 PM |
2257 | if (ret < 0) |
2258 | goto err4; | |
1da177e4 LT |
2259 | |
2260 | /* Register setsockopt */ | |
2261 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2262 | if (ret < 0) |
2263 | goto err5; | |
1da177e4 | 2264 | |
ff67e4e4 | 2265 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2266 | return 0; |
0eff66e6 PM |
2267 | |
2268 | err5: | |
4538506b | 2269 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
0eff66e6 | 2270 | err4: |
4538506b | 2271 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
0eff66e6 | 2272 | err2: |
3cb609d5 | 2273 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2274 | err1: |
2275 | return ret; | |
1da177e4 LT |
2276 | } |
2277 | ||
65b4b4e8 | 2278 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2279 | { |
2280 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2281 | |
4538506b JE |
2282 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
2283 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); | |
3cb609d5 | 2284 | unregister_pernet_subsys(&ip6_tables_net_ops); |
1da177e4 LT |
2285 | } |
2286 | ||
2287 | EXPORT_SYMBOL(ip6t_register_table); | |
2288 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2289 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2290 | |
65b4b4e8 AM |
2291 | module_init(ip6_tables_init); |
2292 | module_exit(ip6_tables_fini); |