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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Packet matching code. | |
3 | * | |
4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
6b7d31fc | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
1da177e4 | 10 | */ |
90e7d4ab | 11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
4fc268d2 | 12 | #include <linux/capability.h> |
14c85021 | 13 | #include <linux/in.h> |
1da177e4 LT |
14 | #include <linux/skbuff.h> |
15 | #include <linux/kmod.h> | |
16 | #include <linux/vmalloc.h> | |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/module.h> | |
4bdbf6c0 | 19 | #include <linux/poison.h> |
1da177e4 | 20 | #include <linux/icmpv6.h> |
1da177e4 | 21 | #include <net/ipv6.h> |
3bc3fe5e | 22 | #include <net/compat.h> |
1da177e4 | 23 | #include <asm/uaccess.h> |
57b47a53 | 24 | #include <linux/mutex.h> |
1da177e4 | 25 | #include <linux/proc_fs.h> |
3bc3fe5e | 26 | #include <linux/err.h> |
c8923c6b | 27 | #include <linux/cpumask.h> |
1da177e4 LT |
28 | |
29 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
2e4e6a17 | 30 | #include <linux/netfilter/x_tables.h> |
f01ffbd6 | 31 | #include <net/netfilter/nf_log.h> |
e3eaa991 | 32 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
33 | |
34 | MODULE_LICENSE("GPL"); | |
35 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
36 | MODULE_DESCRIPTION("IPv6 packet filter"); | |
37 | ||
1da177e4 LT |
38 | /*#define DEBUG_IP_FIREWALL*/ |
39 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
40 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
41 | ||
42 | #ifdef DEBUG_IP_FIREWALL | |
ff67e4e4 | 43 | #define dprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
44 | #else |
45 | #define dprintf(format, args...) | |
46 | #endif | |
47 | ||
48 | #ifdef DEBUG_IP_FIREWALL_USER | |
ff67e4e4 | 49 | #define duprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
50 | #else |
51 | #define duprintf(format, args...) | |
52 | #endif | |
53 | ||
54 | #ifdef CONFIG_NETFILTER_DEBUG | |
55 | #define IP_NF_ASSERT(x) \ | |
56 | do { \ | |
57 | if (!(x)) \ | |
58 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ | |
0dc47877 | 59 | __func__, __FILE__, __LINE__); \ |
1da177e4 LT |
60 | } while(0) |
61 | #else | |
62 | #define IP_NF_ASSERT(x) | |
63 | #endif | |
1da177e4 | 64 | |
1da177e4 LT |
65 | #if 0 |
66 | /* All the better to debug you with... */ | |
67 | #define static | |
68 | #define inline | |
69 | #endif | |
70 | ||
e3eaa991 JE |
71 | void *ip6t_alloc_initial_table(const struct xt_table *info) |
72 | { | |
73 | return xt_alloc_initial_table(ip6t, IP6T); | |
74 | } | |
75 | EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table); | |
76 | ||
6b7d31fc | 77 | /* |
1da177e4 | 78 | We keep a set of rules for each CPU, so we can avoid write-locking |
6b7d31fc HW |
79 | them in the softirq when updating the counters and therefore |
80 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
81 | context stops packets coming through and allows user context to read | |
82 | the counters or update the rules. | |
1da177e4 | 83 | |
1da177e4 LT |
84 | Hence the start of any table is given by get_table() below. */ |
85 | ||
1da177e4 | 86 | /* Check for an extension */ |
1ab1457c | 87 | int |
1da177e4 LT |
88 | ip6t_ext_hdr(u8 nexthdr) |
89 | { | |
1ab1457c YH |
90 | return ( (nexthdr == IPPROTO_HOPOPTS) || |
91 | (nexthdr == IPPROTO_ROUTING) || | |
92 | (nexthdr == IPPROTO_FRAGMENT) || | |
93 | (nexthdr == IPPROTO_ESP) || | |
94 | (nexthdr == IPPROTO_AH) || | |
95 | (nexthdr == IPPROTO_NONE) || | |
96 | (nexthdr == IPPROTO_DSTOPTS) ); | |
1da177e4 LT |
97 | } |
98 | ||
99 | /* Returns whether matches rule or not. */ | |
022748a9 | 100 | /* Performance critical - called for every packet */ |
1d93a9cb | 101 | static inline bool |
1da177e4 LT |
102 | ip6_packet_match(const struct sk_buff *skb, |
103 | const char *indev, | |
104 | const char *outdev, | |
105 | const struct ip6t_ip6 *ip6info, | |
106 | unsigned int *protoff, | |
cff533ac | 107 | int *fragoff, bool *hotdrop) |
1da177e4 | 108 | { |
1da177e4 | 109 | unsigned long ret; |
0660e03f | 110 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
1da177e4 | 111 | |
e79ec50b | 112 | #define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg))) |
1da177e4 | 113 | |
f2ffd9ee | 114 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
3666ed1c JP |
115 | &ip6info->src), IP6T_INV_SRCIP) || |
116 | FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, | |
117 | &ip6info->dst), IP6T_INV_DSTIP)) { | |
1da177e4 LT |
118 | dprintf("Source or dest mismatch.\n"); |
119 | /* | |
120 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, | |
121 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, | |
122 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); | |
123 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, | |
124 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, | |
125 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ | |
1d93a9cb | 126 | return false; |
1da177e4 LT |
127 | } |
128 | ||
b8dfe498 | 129 | ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask); |
1da177e4 LT |
130 | |
131 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { | |
132 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
133 | indev, ip6info->iniface, | |
134 | ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":""); | |
1d93a9cb | 135 | return false; |
1da177e4 LT |
136 | } |
137 | ||
b8dfe498 | 138 | ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask); |
1da177e4 LT |
139 | |
140 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { | |
141 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
142 | outdev, ip6info->outiface, | |
143 | ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":""); | |
1d93a9cb | 144 | return false; |
1da177e4 LT |
145 | } |
146 | ||
147 | /* ... might want to do something with class and flowlabel here ... */ | |
148 | ||
149 | /* look for the desired protocol header */ | |
150 | if((ip6info->flags & IP6T_F_PROTO)) { | |
b777e0ce PM |
151 | int protohdr; |
152 | unsigned short _frag_off; | |
1da177e4 | 153 | |
b777e0ce | 154 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off); |
51d8b1a6 PM |
155 | if (protohdr < 0) { |
156 | if (_frag_off == 0) | |
cff533ac | 157 | *hotdrop = true; |
1d93a9cb | 158 | return false; |
51d8b1a6 | 159 | } |
b777e0ce | 160 | *fragoff = _frag_off; |
1da177e4 LT |
161 | |
162 | dprintf("Packet protocol %hi ?= %s%hi.\n", | |
1ab1457c | 163 | protohdr, |
1da177e4 LT |
164 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
165 | ip6info->proto); | |
166 | ||
b777e0ce | 167 | if (ip6info->proto == protohdr) { |
1da177e4 | 168 | if(ip6info->invflags & IP6T_INV_PROTO) { |
1d93a9cb | 169 | return false; |
1da177e4 | 170 | } |
1d93a9cb | 171 | return true; |
1da177e4 LT |
172 | } |
173 | ||
174 | /* We need match for the '-p all', too! */ | |
175 | if ((ip6info->proto != 0) && | |
176 | !(ip6info->invflags & IP6T_INV_PROTO)) | |
1d93a9cb | 177 | return false; |
1da177e4 | 178 | } |
1d93a9cb | 179 | return true; |
1da177e4 LT |
180 | } |
181 | ||
182 | /* should be ip6 safe */ | |
022748a9 | 183 | static bool |
1da177e4 LT |
184 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
185 | { | |
186 | if (ipv6->flags & ~IP6T_F_MASK) { | |
187 | duprintf("Unknown flag bits set: %08X\n", | |
188 | ipv6->flags & ~IP6T_F_MASK); | |
ccb79bdc | 189 | return false; |
1da177e4 LT |
190 | } |
191 | if (ipv6->invflags & ~IP6T_INV_MASK) { | |
192 | duprintf("Unknown invflag bits set: %08X\n", | |
193 | ipv6->invflags & ~IP6T_INV_MASK); | |
ccb79bdc | 194 | return false; |
1da177e4 | 195 | } |
ccb79bdc | 196 | return true; |
1da177e4 LT |
197 | } |
198 | ||
199 | static unsigned int | |
7eb35586 | 200 | ip6t_error(struct sk_buff *skb, const struct xt_target_param *par) |
1da177e4 LT |
201 | { |
202 | if (net_ratelimit()) | |
ff67e4e4 | 203 | pr_info("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
204 | |
205 | return NF_DROP; | |
206 | } | |
207 | ||
022748a9 DV |
208 | /* Performance critical - called for every packet */ |
209 | static inline bool | |
d5d1baa1 | 210 | do_match(const struct ip6t_entry_match *m, const struct sk_buff *skb, |
f7108a20 | 211 | struct xt_match_param *par) |
1da177e4 | 212 | { |
f7108a20 JE |
213 | par->match = m->u.kernel.match; |
214 | par->matchinfo = m->data; | |
215 | ||
1da177e4 | 216 | /* Stop iteration if it doesn't match */ |
f7108a20 | 217 | if (!m->u.kernel.match->match(skb, par)) |
1d93a9cb | 218 | return true; |
1da177e4 | 219 | else |
1d93a9cb | 220 | return false; |
1da177e4 LT |
221 | } |
222 | ||
223 | static inline struct ip6t_entry * | |
d5d1baa1 | 224 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
225 | { |
226 | return (struct ip6t_entry *)(base + offset); | |
227 | } | |
228 | ||
ba9dda3a | 229 | /* All zeroes == unconditional rule. */ |
022748a9 | 230 | /* Mildly perf critical (only if packet tracing is on) */ |
47901dc2 | 231 | static inline bool unconditional(const struct ip6t_ip6 *ipv6) |
ba9dda3a | 232 | { |
47901dc2 | 233 | static const struct ip6t_ip6 uncond; |
ba9dda3a | 234 | |
47901dc2 | 235 | return memcmp(ipv6, &uncond, sizeof(uncond)) == 0; |
ba9dda3a JK |
236 | } |
237 | ||
d5d1baa1 JE |
238 | static inline const struct ip6t_entry_target * |
239 | ip6t_get_target_c(const struct ip6t_entry *e) | |
240 | { | |
241 | return ip6t_get_target((struct ip6t_entry *)e); | |
242 | } | |
243 | ||
ba9dda3a JK |
244 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
245 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
246 | /* This cries for unification! */ | |
022748a9 | 247 | static const char *const hooknames[] = { |
6e23ae2a PM |
248 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
249 | [NF_INET_LOCAL_IN] = "INPUT", | |
250 | [NF_INET_FORWARD] = "FORWARD", | |
251 | [NF_INET_LOCAL_OUT] = "OUTPUT", | |
252 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
253 | }; |
254 | ||
255 | enum nf_ip_trace_comments { | |
256 | NF_IP6_TRACE_COMMENT_RULE, | |
257 | NF_IP6_TRACE_COMMENT_RETURN, | |
258 | NF_IP6_TRACE_COMMENT_POLICY, | |
259 | }; | |
260 | ||
022748a9 | 261 | static const char *const comments[] = { |
ba9dda3a JK |
262 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
263 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", | |
264 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", | |
265 | }; | |
266 | ||
267 | static struct nf_loginfo trace_loginfo = { | |
268 | .type = NF_LOG_TYPE_LOG, | |
269 | .u = { | |
270 | .log = { | |
271 | .level = 4, | |
272 | .logflags = NF_LOG_MASK, | |
273 | }, | |
274 | }, | |
275 | }; | |
276 | ||
022748a9 | 277 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 278 | static inline int |
d5d1baa1 | 279 | get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e, |
4f2f6f23 JE |
280 | const char *hookname, const char **chainname, |
281 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 282 | { |
d5d1baa1 | 283 | const struct ip6t_standard_target *t = (void *)ip6t_get_target_c(s); |
ba9dda3a JK |
284 | |
285 | if (strcmp(t->target.u.kernel.target->name, IP6T_ERROR_TARGET) == 0) { | |
286 | /* Head of user chain: ERROR target with chainname */ | |
287 | *chainname = t->target.data; | |
288 | (*rulenum) = 0; | |
289 | } else if (s == e) { | |
290 | (*rulenum)++; | |
291 | ||
3666ed1c JP |
292 | if (s->target_offset == sizeof(struct ip6t_entry) && |
293 | strcmp(t->target.u.kernel.target->name, | |
294 | IP6T_STANDARD_TARGET) == 0 && | |
295 | t->verdict < 0 && | |
296 | unconditional(&s->ipv6)) { | |
ba9dda3a JK |
297 | /* Tail of chains: STANDARD target (return/policy) */ |
298 | *comment = *chainname == hookname | |
4f2f6f23 JE |
299 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
300 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
301 | } |
302 | return 1; | |
303 | } else | |
304 | (*rulenum)++; | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
d5d1baa1 | 309 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
310 | unsigned int hook, |
311 | const struct net_device *in, | |
312 | const struct net_device *out, | |
ecb6f85e | 313 | const char *tablename, |
d5d1baa1 JE |
314 | const struct xt_table_info *private, |
315 | const struct ip6t_entry *e) | |
ba9dda3a | 316 | { |
d5d1baa1 | 317 | const void *table_base; |
5452e425 | 318 | const struct ip6t_entry *root; |
4f2f6f23 | 319 | const char *hookname, *chainname, *comment; |
72b2b1dd | 320 | const struct ip6t_entry *iter; |
ba9dda3a JK |
321 | unsigned int rulenum = 0; |
322 | ||
ccf5bd8c | 323 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
324 | root = get_entry(table_base, private->hook_entry[hook]); |
325 | ||
4f2f6f23 JE |
326 | hookname = chainname = hooknames[hook]; |
327 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; | |
ba9dda3a | 328 | |
72b2b1dd JE |
329 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
330 | if (get_chainname_rulenum(iter, e, hookname, | |
331 | &chainname, &comment, &rulenum) != 0) | |
332 | break; | |
ba9dda3a JK |
333 | |
334 | nf_log_packet(AF_INET6, hook, skb, in, out, &trace_loginfo, | |
335 | "TRACE: %s:%s:%s:%u ", | |
336 | tablename, chainname, comment, rulenum); | |
337 | } | |
338 | #endif | |
339 | ||
98e86403 JE |
340 | static inline __pure struct ip6t_entry * |
341 | ip6t_next_entry(const struct ip6t_entry *entry) | |
342 | { | |
343 | return (void *)entry + entry->next_offset; | |
344 | } | |
345 | ||
1da177e4 LT |
346 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
347 | unsigned int | |
3db05fea | 348 | ip6t_do_table(struct sk_buff *skb, |
1da177e4 LT |
349 | unsigned int hook, |
350 | const struct net_device *in, | |
351 | const struct net_device *out, | |
fe1cb108 | 352 | struct xt_table *table) |
1da177e4 | 353 | { |
6b7d31fc | 354 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
cff533ac | 355 | bool hotdrop = false; |
1da177e4 LT |
356 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
357 | unsigned int verdict = NF_DROP; | |
358 | const char *indev, *outdev; | |
d5d1baa1 | 359 | const void *table_base; |
f3c5c1bf JE |
360 | struct ip6t_entry *e, **jumpstack; |
361 | unsigned int *stackptr, origptr, cpu; | |
d5d1baa1 | 362 | const struct xt_table_info *private; |
f7108a20 | 363 | struct xt_match_param mtpar; |
7eb35586 | 364 | struct xt_target_param tgpar; |
1da177e4 LT |
365 | |
366 | /* Initialization */ | |
367 | indev = in ? in->name : nulldevname; | |
368 | outdev = out ? out->name : nulldevname; | |
1da177e4 LT |
369 | /* We handle fragments by dealing with the first fragment as |
370 | * if it was a normal packet. All other fragments are treated | |
371 | * normally, except that they will NEVER match rules that ask | |
372 | * things we don't know, ie. tcp syn flag or ports). If the | |
373 | * rule is also a fragment-specific rule, non-fragments won't | |
374 | * match it. */ | |
f7108a20 | 375 | mtpar.hotdrop = &hotdrop; |
7eb35586 JE |
376 | mtpar.in = tgpar.in = in; |
377 | mtpar.out = tgpar.out = out; | |
916a917d | 378 | mtpar.family = tgpar.family = NFPROTO_IPV6; |
a5e78820 | 379 | mtpar.hooknum = tgpar.hooknum = hook; |
1da177e4 | 380 | |
1da177e4 | 381 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
78454473 | 382 | |
942e4a2b SH |
383 | xt_info_rdlock_bh(); |
384 | private = table->private; | |
f3c5c1bf JE |
385 | cpu = smp_processor_id(); |
386 | table_base = private->entries[cpu]; | |
387 | jumpstack = (struct ip6t_entry **)private->jumpstack[cpu]; | |
388 | stackptr = &private->stackptr[cpu]; | |
389 | origptr = *stackptr; | |
78454473 | 390 | |
2e4e6a17 | 391 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 392 | |
1da177e4 | 393 | do { |
d5d1baa1 | 394 | const struct ip6t_entry_target *t; |
dcea992a | 395 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 396 | |
1da177e4 | 397 | IP_NF_ASSERT(e); |
a1ff4ac8 | 398 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
dcea992a JE |
399 | &mtpar.thoff, &mtpar.fragoff, &hotdrop)) { |
400 | no_match: | |
a1ff4ac8 JE |
401 | e = ip6t_next_entry(e); |
402 | continue; | |
403 | } | |
1da177e4 | 404 | |
dcea992a JE |
405 | xt_ematch_foreach(ematch, e) |
406 | if (do_match(ematch, skb, &mtpar) != 0) | |
407 | goto no_match; | |
408 | ||
a1ff4ac8 JE |
409 | ADD_COUNTER(e->counters, |
410 | ntohs(ipv6_hdr(skb)->payload_len) + | |
411 | sizeof(struct ipv6hdr), 1); | |
1da177e4 | 412 | |
d5d1baa1 | 413 | t = ip6t_get_target_c(e); |
a1ff4ac8 | 414 | IP_NF_ASSERT(t->u.kernel.target); |
ba9dda3a JK |
415 | |
416 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
417 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
a1ff4ac8 JE |
418 | /* The packet is traced: log it */ |
419 | if (unlikely(skb->nf_trace)) | |
420 | trace_packet(skb, hook, in, out, | |
421 | table->name, private, e); | |
ba9dda3a | 422 | #endif |
a1ff4ac8 JE |
423 | /* Standard target? */ |
424 | if (!t->u.kernel.target->target) { | |
425 | int v; | |
426 | ||
427 | v = ((struct ip6t_standard_target *)t)->verdict; | |
428 | if (v < 0) { | |
429 | /* Pop from stack? */ | |
430 | if (v != IP6T_RETURN) { | |
431 | verdict = (unsigned)(-v) - 1; | |
432 | break; | |
1da177e4 | 433 | } |
f3c5c1bf JE |
434 | if (*stackptr == 0) |
435 | e = get_entry(table_base, | |
436 | private->underflow[hook]); | |
437 | else | |
438 | e = ip6t_next_entry(jumpstack[--*stackptr]); | |
a1ff4ac8 JE |
439 | continue; |
440 | } | |
3666ed1c JP |
441 | if (table_base + v != ip6t_next_entry(e) && |
442 | !(e->ipv6.flags & IP6T_F_GOTO)) { | |
f3c5c1bf JE |
443 | if (*stackptr >= private->stacksize) { |
444 | verdict = NF_DROP; | |
445 | break; | |
446 | } | |
447 | jumpstack[(*stackptr)++] = e; | |
a1ff4ac8 | 448 | } |
1da177e4 | 449 | |
a1ff4ac8 | 450 | e = get_entry(table_base, v); |
7a6b1c46 JE |
451 | continue; |
452 | } | |
453 | ||
7a6b1c46 JE |
454 | tgpar.target = t->u.kernel.target; |
455 | tgpar.targinfo = t->data; | |
7eb35586 | 456 | |
7a6b1c46 | 457 | verdict = t->u.kernel.target->target(skb, &tgpar); |
7a6b1c46 JE |
458 | if (verdict == IP6T_CONTINUE) |
459 | e = ip6t_next_entry(e); | |
460 | else | |
461 | /* Verdict */ | |
462 | break; | |
1da177e4 LT |
463 | } while (!hotdrop); |
464 | ||
942e4a2b | 465 | xt_info_rdunlock_bh(); |
f3c5c1bf | 466 | *stackptr = origptr; |
1da177e4 LT |
467 | |
468 | #ifdef DEBUG_ALLOW_ALL | |
469 | return NF_ACCEPT; | |
470 | #else | |
471 | if (hotdrop) | |
472 | return NF_DROP; | |
473 | else return verdict; | |
474 | #endif | |
475 | } | |
476 | ||
1da177e4 LT |
477 | /* Figures out from what hook each rule can be called: returns 0 if |
478 | there are loops. Puts hook bitmask in comefrom. */ | |
479 | static int | |
d5d1baa1 | 480 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 481 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
482 | { |
483 | unsigned int hook; | |
484 | ||
485 | /* No recursion; use packet counter to save back ptrs (reset | |
486 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 487 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 488 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 489 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
1da177e4 LT |
490 | |
491 | if (!(valid_hooks & (1 << hook))) | |
492 | continue; | |
493 | ||
494 | /* Set initial back pointer. */ | |
495 | e->counters.pcnt = pos; | |
496 | ||
497 | for (;;) { | |
d5d1baa1 JE |
498 | const struct ip6t_standard_target *t |
499 | = (void *)ip6t_get_target_c(e); | |
9c547959 | 500 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 501 | |
6e23ae2a | 502 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
503 | printk("iptables: loop hook %u pos %u %08X.\n", |
504 | hook, pos, e->comefrom); | |
505 | return 0; | |
506 | } | |
9c547959 | 507 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
508 | |
509 | /* Unconditional return/END. */ | |
3666ed1c JP |
510 | if ((e->target_offset == sizeof(struct ip6t_entry) && |
511 | (strcmp(t->target.u.user.name, | |
512 | IP6T_STANDARD_TARGET) == 0) && | |
513 | t->verdict < 0 && | |
514 | unconditional(&e->ipv6)) || visited) { | |
1da177e4 LT |
515 | unsigned int oldpos, size; |
516 | ||
1f9352ae PM |
517 | if ((strcmp(t->target.u.user.name, |
518 | IP6T_STANDARD_TARGET) == 0) && | |
519 | t->verdict < -NF_MAX_VERDICT - 1) { | |
74c9c0c1 DM |
520 | duprintf("mark_source_chains: bad " |
521 | "negative verdict (%i)\n", | |
522 | t->verdict); | |
523 | return 0; | |
524 | } | |
525 | ||
1da177e4 LT |
526 | /* Return: backtrack through the last |
527 | big jump. */ | |
528 | do { | |
6e23ae2a | 529 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
530 | #ifdef DEBUG_IP_FIREWALL_USER |
531 | if (e->comefrom | |
6e23ae2a | 532 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
533 | duprintf("Back unset " |
534 | "on hook %u " | |
535 | "rule %u\n", | |
536 | hook, pos); | |
537 | } | |
538 | #endif | |
539 | oldpos = pos; | |
540 | pos = e->counters.pcnt; | |
541 | e->counters.pcnt = 0; | |
542 | ||
543 | /* We're at the start. */ | |
544 | if (pos == oldpos) | |
545 | goto next; | |
546 | ||
547 | e = (struct ip6t_entry *) | |
31836064 | 548 | (entry0 + pos); |
1da177e4 LT |
549 | } while (oldpos == pos + e->next_offset); |
550 | ||
551 | /* Move along one */ | |
552 | size = e->next_offset; | |
553 | e = (struct ip6t_entry *) | |
31836064 | 554 | (entry0 + pos + size); |
1da177e4 LT |
555 | e->counters.pcnt = pos; |
556 | pos += size; | |
557 | } else { | |
558 | int newpos = t->verdict; | |
559 | ||
560 | if (strcmp(t->target.u.user.name, | |
3666ed1c JP |
561 | IP6T_STANDARD_TARGET) == 0 && |
562 | newpos >= 0) { | |
74c9c0c1 DM |
563 | if (newpos > newinfo->size - |
564 | sizeof(struct ip6t_entry)) { | |
565 | duprintf("mark_source_chains: " | |
566 | "bad verdict (%i)\n", | |
567 | newpos); | |
568 | return 0; | |
569 | } | |
1da177e4 LT |
570 | /* This a jump; chase it. */ |
571 | duprintf("Jump rule %u -> %u\n", | |
572 | pos, newpos); | |
573 | } else { | |
574 | /* ... this is a fallthru */ | |
575 | newpos = pos + e->next_offset; | |
576 | } | |
577 | e = (struct ip6t_entry *) | |
31836064 | 578 | (entry0 + newpos); |
1da177e4 LT |
579 | e->counters.pcnt = pos; |
580 | pos = newpos; | |
581 | } | |
582 | } | |
583 | next: | |
584 | duprintf("Finished chain %u\n", hook); | |
585 | } | |
586 | return 1; | |
587 | } | |
588 | ||
6bdb331b | 589 | static void cleanup_match(struct ip6t_entry_match *m, struct net *net) |
1da177e4 | 590 | { |
6be3d859 JE |
591 | struct xt_mtdtor_param par; |
592 | ||
f54e9367 | 593 | par.net = net; |
6be3d859 JE |
594 | par.match = m->u.kernel.match; |
595 | par.matchinfo = m->data; | |
916a917d | 596 | par.family = NFPROTO_IPV6; |
6be3d859 JE |
597 | if (par.match->destroy != NULL) |
598 | par.match->destroy(&par); | |
599 | module_put(par.match->me); | |
1da177e4 LT |
600 | } |
601 | ||
022748a9 | 602 | static int |
d5d1baa1 | 603 | check_entry(const struct ip6t_entry *e, const char *name) |
f173c8a1 | 604 | { |
d5d1baa1 | 605 | const struct ip6t_entry_target *t; |
f173c8a1 PM |
606 | |
607 | if (!ip6_checkentry(&e->ipv6)) { | |
608 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
609 | return -EINVAL; | |
610 | } | |
611 | ||
612 | if (e->target_offset + sizeof(struct ip6t_entry_target) > | |
613 | e->next_offset) | |
614 | return -EINVAL; | |
615 | ||
d5d1baa1 | 616 | t = ip6t_get_target_c(e); |
f173c8a1 PM |
617 | if (e->target_offset + t->u.target_size > e->next_offset) |
618 | return -EINVAL; | |
619 | ||
620 | return 0; | |
621 | } | |
622 | ||
6bdb331b | 623 | static int check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par) |
f173c8a1 | 624 | { |
9b4fce7a | 625 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
f173c8a1 PM |
626 | int ret; |
627 | ||
9b4fce7a JE |
628 | par->match = m->u.kernel.match; |
629 | par->matchinfo = m->data; | |
630 | ||
916a917d | 631 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 632 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
367c6790 | 633 | if (ret < 0) { |
f173c8a1 | 634 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 635 | par.match->name); |
367c6790 | 636 | return ret; |
f173c8a1 | 637 | } |
367c6790 | 638 | return 0; |
f173c8a1 PM |
639 | } |
640 | ||
022748a9 | 641 | static int |
6bdb331b | 642 | find_check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 643 | { |
6709dbbb | 644 | struct xt_match *match; |
3cdc7c95 | 645 | int ret; |
1da177e4 | 646 | |
fd0ec0e6 JE |
647 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
648 | m->u.user.revision); | |
649 | if (IS_ERR(match)) { | |
f173c8a1 | 650 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 651 | return PTR_ERR(match); |
1da177e4 LT |
652 | } |
653 | m->u.kernel.match = match; | |
1da177e4 | 654 | |
6bdb331b | 655 | ret = check_match(m, par); |
3cdc7c95 PM |
656 | if (ret) |
657 | goto err; | |
658 | ||
1da177e4 | 659 | return 0; |
3cdc7c95 PM |
660 | err: |
661 | module_put(m->u.kernel.match->me); | |
662 | return ret; | |
1da177e4 LT |
663 | } |
664 | ||
add67461 | 665 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
1da177e4 | 666 | { |
af5d6dc2 JE |
667 | struct ip6t_entry_target *t = ip6t_get_target(e); |
668 | struct xt_tgchk_param par = { | |
add67461 | 669 | .net = net, |
af5d6dc2 JE |
670 | .table = name, |
671 | .entryinfo = e, | |
672 | .target = t->u.kernel.target, | |
673 | .targinfo = t->data, | |
674 | .hook_mask = e->comefrom, | |
916a917d | 675 | .family = NFPROTO_IPV6, |
af5d6dc2 | 676 | }; |
1da177e4 | 677 | int ret; |
1da177e4 | 678 | |
f173c8a1 | 679 | t = ip6t_get_target(e); |
916a917d | 680 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 681 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
367c6790 | 682 | if (ret < 0) { |
f173c8a1 PM |
683 | duprintf("ip_tables: check failed for `%s'.\n", |
684 | t->u.kernel.target->name); | |
367c6790 | 685 | return ret; |
1da177e4 | 686 | } |
367c6790 | 687 | return 0; |
f173c8a1 | 688 | } |
1da177e4 | 689 | |
022748a9 | 690 | static int |
a83d8e8d | 691 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
0559518b | 692 | unsigned int size) |
f173c8a1 PM |
693 | { |
694 | struct ip6t_entry_target *t; | |
695 | struct xt_target *target; | |
696 | int ret; | |
697 | unsigned int j; | |
9b4fce7a | 698 | struct xt_mtchk_param mtpar; |
dcea992a | 699 | struct xt_entry_match *ematch; |
f173c8a1 PM |
700 | |
701 | ret = check_entry(e, name); | |
702 | if (ret) | |
703 | return ret; | |
590bdf7f | 704 | |
1da177e4 | 705 | j = 0; |
a83d8e8d | 706 | mtpar.net = net; |
9b4fce7a JE |
707 | mtpar.table = name; |
708 | mtpar.entryinfo = &e->ipv6; | |
709 | mtpar.hook_mask = e->comefrom; | |
916a917d | 710 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 711 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 712 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 713 | if (ret != 0) |
6bdb331b JE |
714 | goto cleanup_matches; |
715 | ++j; | |
dcea992a | 716 | } |
1da177e4 LT |
717 | |
718 | t = ip6t_get_target(e); | |
d2a7b6ba JE |
719 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
720 | t->u.user.revision); | |
721 | if (IS_ERR(target)) { | |
f173c8a1 | 722 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 723 | ret = PTR_ERR(target); |
1da177e4 LT |
724 | goto cleanup_matches; |
725 | } | |
726 | t->u.kernel.target = target; | |
6b7d31fc | 727 | |
add67461 | 728 | ret = check_target(e, net, name); |
3cdc7c95 PM |
729 | if (ret) |
730 | goto err; | |
1da177e4 | 731 | return 0; |
3cdc7c95 PM |
732 | err: |
733 | module_put(t->u.kernel.target->me); | |
1da177e4 | 734 | cleanup_matches: |
6bdb331b JE |
735 | xt_ematch_foreach(ematch, e) { |
736 | if (j-- == 0) | |
dcea992a | 737 | break; |
6bdb331b JE |
738 | cleanup_match(ematch, net); |
739 | } | |
1da177e4 LT |
740 | return ret; |
741 | } | |
742 | ||
d5d1baa1 | 743 | static bool check_underflow(const struct ip6t_entry *e) |
e2fe35c1 JE |
744 | { |
745 | const struct ip6t_entry_target *t; | |
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; | |
753 | verdict = ((struct ip6t_standard_target *)t)->verdict; | |
754 | verdict = -verdict - 1; | |
755 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
756 | } | |
757 | ||
022748a9 | 758 | static int |
1da177e4 | 759 | check_entry_size_and_hooks(struct ip6t_entry *e, |
2e4e6a17 | 760 | struct xt_table_info *newinfo, |
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 | |
776 | < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) { | |
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; |
1da177e4 | 808 | struct ip6t_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); | |
1da177e4 LT |
823 | } |
824 | ||
825 | /* Checks and translates the user-supplied table segment (held in | |
826 | newinfo) */ | |
827 | static int | |
0f234214 JE |
828 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
829 | const struct ip6t_replace *repl) | |
1da177e4 | 830 | { |
72b2b1dd | 831 | struct ip6t_entry *iter; |
1da177e4 | 832 | unsigned int i; |
72b2b1dd | 833 | int ret = 0; |
1da177e4 | 834 | |
0f234214 JE |
835 | newinfo->size = repl->size; |
836 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
837 | |
838 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 839 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
840 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
841 | newinfo->underflow[i] = 0xFFFFFFFF; | |
842 | } | |
843 | ||
844 | duprintf("translate_table: size %u\n", newinfo->size); | |
845 | i = 0; | |
846 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
847 | xt_entry_foreach(iter, entry0, newinfo->size) { |
848 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
849 | entry0 + repl->size, |
850 | repl->hook_entry, | |
851 | repl->underflow, | |
852 | repl->valid_hooks); | |
72b2b1dd | 853 | if (ret != 0) |
0559518b JE |
854 | return ret; |
855 | ++i; | |
f3c5c1bf JE |
856 | if (strcmp(ip6t_get_target(iter)->u.user.name, |
857 | XT_ERROR_TARGET) == 0) | |
858 | ++newinfo->stacksize; | |
72b2b1dd | 859 | } |
1da177e4 | 860 | |
0f234214 | 861 | if (i != repl->num_entries) { |
1da177e4 | 862 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 863 | i, repl->num_entries); |
1da177e4 LT |
864 | return -EINVAL; |
865 | } | |
866 | ||
867 | /* Check hooks all assigned */ | |
6e23ae2a | 868 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 869 | /* Only hooks which are valid */ |
0f234214 | 870 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
871 | continue; |
872 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
873 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 874 | i, repl->hook_entry[i]); |
1da177e4 LT |
875 | return -EINVAL; |
876 | } | |
877 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
878 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 879 | i, repl->underflow[i]); |
1da177e4 LT |
880 | return -EINVAL; |
881 | } | |
882 | } | |
883 | ||
0f234214 | 884 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
885 | return -ELOOP; |
886 | ||
1da177e4 LT |
887 | /* Finally, each sanity check must pass */ |
888 | i = 0; | |
72b2b1dd | 889 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 890 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
891 | if (ret != 0) |
892 | break; | |
0559518b | 893 | ++i; |
72b2b1dd | 894 | } |
1da177e4 | 895 | |
74c9c0c1 | 896 | if (ret != 0) { |
0559518b JE |
897 | xt_entry_foreach(iter, entry0, newinfo->size) { |
898 | if (i-- == 0) | |
72b2b1dd | 899 | break; |
0559518b JE |
900 | cleanup_entry(iter, net); |
901 | } | |
74c9c0c1 DM |
902 | return ret; |
903 | } | |
1da177e4 LT |
904 | |
905 | /* And one copy for every other CPU */ | |
6f912042 | 906 | for_each_possible_cpu(i) { |
31836064 ED |
907 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
908 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
909 | } |
910 | ||
9c547959 | 911 | return ret; |
1da177e4 LT |
912 | } |
913 | ||
1da177e4 | 914 | static void |
2e4e6a17 HW |
915 | get_counters(const struct xt_table_info *t, |
916 | struct xt_counters counters[]) | |
1da177e4 | 917 | { |
72b2b1dd | 918 | struct ip6t_entry *iter; |
1da177e4 LT |
919 | unsigned int cpu; |
920 | unsigned int i; | |
31836064 ED |
921 | unsigned int curcpu; |
922 | ||
923 | /* Instead of clearing (by a previous call to memset()) | |
924 | * the counters and using adds, we set the counters | |
925 | * with data used by 'current' CPU | |
942e4a2b SH |
926 | * |
927 | * Bottom half has to be disabled to prevent deadlock | |
928 | * if new softirq were to run and call ipt_do_table | |
31836064 | 929 | */ |
942e4a2b SH |
930 | local_bh_disable(); |
931 | curcpu = smp_processor_id(); | |
31836064 ED |
932 | |
933 | i = 0; | |
0559518b JE |
934 | xt_entry_foreach(iter, t->entries[curcpu], t->size) { |
935 | SET_COUNTER(counters[i], iter->counters.bcnt, | |
6b4ff2d7 | 936 | iter->counters.pcnt); |
0559518b JE |
937 | ++i; |
938 | } | |
1da177e4 | 939 | |
6f912042 | 940 | for_each_possible_cpu(cpu) { |
31836064 ED |
941 | if (cpu == curcpu) |
942 | continue; | |
1da177e4 | 943 | i = 0; |
942e4a2b | 944 | xt_info_wrlock(cpu); |
0559518b JE |
945 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
946 | ADD_COUNTER(counters[i], iter->counters.bcnt, | |
6b4ff2d7 | 947 | iter->counters.pcnt); |
0559518b JE |
948 | ++i; |
949 | } | |
942e4a2b | 950 | xt_info_wrunlock(cpu); |
1da177e4 | 951 | } |
78454473 SH |
952 | local_bh_enable(); |
953 | } | |
954 | ||
d5d1baa1 | 955 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 956 | { |
ed1a6f5e | 957 | unsigned int countersize; |
2e4e6a17 | 958 | struct xt_counters *counters; |
d5d1baa1 | 959 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
960 | |
961 | /* We need atomic snapshot of counters: rest doesn't change | |
962 | (other than comefrom, which userspace doesn't care | |
963 | about). */ | |
2e4e6a17 | 964 | countersize = sizeof(struct xt_counters) * private->number; |
3b84e92b | 965 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
966 | |
967 | if (counters == NULL) | |
942e4a2b | 968 | return ERR_PTR(-ENOMEM); |
78454473 | 969 | |
942e4a2b | 970 | get_counters(private, counters); |
78454473 | 971 | |
49a88d18 | 972 | return counters; |
ed1a6f5e PM |
973 | } |
974 | ||
975 | static int | |
976 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 977 | const struct xt_table *table, |
ed1a6f5e PM |
978 | void __user *userptr) |
979 | { | |
980 | unsigned int off, num; | |
d5d1baa1 | 981 | const struct ip6t_entry *e; |
ed1a6f5e | 982 | struct xt_counters *counters; |
5452e425 | 983 | const struct xt_table_info *private = table->private; |
ed1a6f5e | 984 | int ret = 0; |
5452e425 | 985 | const void *loc_cpu_entry; |
ed1a6f5e PM |
986 | |
987 | counters = alloc_counters(table); | |
988 | if (IS_ERR(counters)) | |
989 | return PTR_ERR(counters); | |
990 | ||
9c547959 PM |
991 | /* choose the copy that is on our node/cpu, ... |
992 | * This choice is lazy (because current thread is | |
993 | * allowed to migrate to another cpu) | |
994 | */ | |
2e4e6a17 | 995 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 996 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
997 | ret = -EFAULT; |
998 | goto free_counters; | |
999 | } | |
1000 | ||
1001 | /* FIXME: use iterator macros --RR */ | |
1002 | /* ... then go back and fix counters and names */ | |
1003 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
1004 | unsigned int i; | |
5452e425 JE |
1005 | const struct ip6t_entry_match *m; |
1006 | const struct ip6t_entry_target *t; | |
1da177e4 | 1007 | |
31836064 | 1008 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
1009 | if (copy_to_user(userptr + off |
1010 | + offsetof(struct ip6t_entry, counters), | |
1011 | &counters[num], | |
1012 | sizeof(counters[num])) != 0) { | |
1013 | ret = -EFAULT; | |
1014 | goto free_counters; | |
1015 | } | |
1016 | ||
1017 | for (i = sizeof(struct ip6t_entry); | |
1018 | i < e->target_offset; | |
1019 | i += m->u.match_size) { | |
1020 | m = (void *)e + i; | |
1021 | ||
1022 | if (copy_to_user(userptr + off + i | |
1023 | + offsetof(struct ip6t_entry_match, | |
1024 | u.user.name), | |
1025 | m->u.kernel.match->name, | |
1026 | strlen(m->u.kernel.match->name)+1) | |
1027 | != 0) { | |
1028 | ret = -EFAULT; | |
1029 | goto free_counters; | |
1030 | } | |
1031 | } | |
1032 | ||
d5d1baa1 | 1033 | t = ip6t_get_target_c(e); |
1da177e4 LT |
1034 | if (copy_to_user(userptr + off + e->target_offset |
1035 | + offsetof(struct ip6t_entry_target, | |
1036 | u.user.name), | |
1037 | t->u.kernel.target->name, | |
1038 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1039 | ret = -EFAULT; | |
1040 | goto free_counters; | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | free_counters: | |
1045 | vfree(counters); | |
1046 | return ret; | |
1047 | } | |
1048 | ||
3bc3fe5e | 1049 | #ifdef CONFIG_COMPAT |
739674fb | 1050 | static void compat_standard_from_user(void *dst, const void *src) |
3bc3fe5e PM |
1051 | { |
1052 | int v = *(compat_int_t *)src; | |
1053 | ||
1054 | if (v > 0) | |
1055 | v += xt_compat_calc_jump(AF_INET6, v); | |
1056 | memcpy(dst, &v, sizeof(v)); | |
1057 | } | |
1058 | ||
739674fb | 1059 | static int compat_standard_to_user(void __user *dst, const void *src) |
3bc3fe5e PM |
1060 | { |
1061 | compat_int_t cv = *(int *)src; | |
1062 | ||
1063 | if (cv > 0) | |
1064 | cv -= xt_compat_calc_jump(AF_INET6, cv); | |
1065 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
1066 | } | |
1067 | ||
d5d1baa1 | 1068 | static int compat_calc_entry(const struct ip6t_entry *e, |
3bc3fe5e | 1069 | const struct xt_table_info *info, |
d5d1baa1 | 1070 | const void *base, struct xt_table_info *newinfo) |
3bc3fe5e | 1071 | { |
dcea992a | 1072 | const struct xt_entry_match *ematch; |
d5d1baa1 | 1073 | const struct ip6t_entry_target *t; |
3bc3fe5e PM |
1074 | unsigned int entry_offset; |
1075 | int off, i, ret; | |
1076 | ||
1077 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1078 | entry_offset = (void *)e - base; | |
dcea992a | 1079 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1080 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1081 | t = ip6t_get_target_c(e); |
3bc3fe5e PM |
1082 | off += xt_compat_target_offset(t->u.kernel.target); |
1083 | newinfo->size -= off; | |
1084 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1085 | if (ret) | |
1086 | return ret; | |
1087 | ||
1088 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1089 | if (info->hook_entry[i] && | |
1090 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) | |
1091 | newinfo->hook_entry[i] -= off; | |
1092 | if (info->underflow[i] && | |
1093 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) | |
1094 | newinfo->underflow[i] -= off; | |
1095 | } | |
1096 | return 0; | |
1097 | } | |
1098 | ||
1099 | static int compat_table_info(const struct xt_table_info *info, | |
1100 | struct xt_table_info *newinfo) | |
1101 | { | |
72b2b1dd | 1102 | struct ip6t_entry *iter; |
3bc3fe5e | 1103 | void *loc_cpu_entry; |
0559518b | 1104 | int ret; |
3bc3fe5e PM |
1105 | |
1106 | if (!newinfo || !info) | |
1107 | return -EINVAL; | |
1108 | ||
1109 | /* we dont care about newinfo->entries[] */ | |
1110 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1111 | newinfo->initial_entries = 0; | |
1112 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
72b2b1dd JE |
1113 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1114 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1115 | if (ret != 0) | |
0559518b | 1116 | return ret; |
72b2b1dd | 1117 | } |
0559518b | 1118 | return 0; |
3bc3fe5e PM |
1119 | } |
1120 | #endif | |
1121 | ||
d5d1baa1 JE |
1122 | static int get_info(struct net *net, void __user *user, |
1123 | const int *len, int compat) | |
433665c9 PM |
1124 | { |
1125 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1126 | struct xt_table *t; | |
1127 | int ret; | |
1128 | ||
1129 | if (*len != sizeof(struct ip6t_getinfo)) { | |
c9d8fe13 | 1130 | duprintf("length %u != %zu\n", *len, |
433665c9 PM |
1131 | sizeof(struct ip6t_getinfo)); |
1132 | return -EINVAL; | |
1133 | } | |
1134 | ||
1135 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1136 | return -EFAULT; | |
1137 | ||
1138 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; | |
3bc3fe5e PM |
1139 | #ifdef CONFIG_COMPAT |
1140 | if (compat) | |
1141 | xt_compat_lock(AF_INET6); | |
1142 | #endif | |
336b517f | 1143 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
433665c9 PM |
1144 | "ip6table_%s", name); |
1145 | if (t && !IS_ERR(t)) { | |
1146 | struct ip6t_getinfo info; | |
5452e425 | 1147 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1148 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1149 | struct xt_table_info tmp; |
1150 | ||
3bc3fe5e | 1151 | if (compat) { |
3bc3fe5e PM |
1152 | ret = compat_table_info(private, &tmp); |
1153 | xt_compat_flush_offsets(AF_INET6); | |
1154 | private = &tmp; | |
1155 | } | |
1156 | #endif | |
433665c9 PM |
1157 | info.valid_hooks = t->valid_hooks; |
1158 | memcpy(info.hook_entry, private->hook_entry, | |
1159 | sizeof(info.hook_entry)); | |
1160 | memcpy(info.underflow, private->underflow, | |
1161 | sizeof(info.underflow)); | |
1162 | info.num_entries = private->number; | |
1163 | info.size = private->size; | |
b5dd674b | 1164 | strcpy(info.name, name); |
433665c9 PM |
1165 | |
1166 | if (copy_to_user(user, &info, *len) != 0) | |
1167 | ret = -EFAULT; | |
1168 | else | |
1169 | ret = 0; | |
1170 | ||
1171 | xt_table_unlock(t); | |
1172 | module_put(t->me); | |
1173 | } else | |
1174 | ret = t ? PTR_ERR(t) : -ENOENT; | |
3bc3fe5e PM |
1175 | #ifdef CONFIG_COMPAT |
1176 | if (compat) | |
1177 | xt_compat_unlock(AF_INET6); | |
1178 | #endif | |
433665c9 PM |
1179 | return ret; |
1180 | } | |
1181 | ||
1da177e4 | 1182 | static int |
d5d1baa1 JE |
1183 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
1184 | const int *len) | |
1da177e4 LT |
1185 | { |
1186 | int ret; | |
d924357c | 1187 | struct ip6t_get_entries get; |
2e4e6a17 | 1188 | struct xt_table *t; |
1da177e4 | 1189 | |
d924357c | 1190 | if (*len < sizeof(get)) { |
c9d8fe13 | 1191 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
d924357c PM |
1192 | return -EINVAL; |
1193 | } | |
1194 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1195 | return -EFAULT; | |
1196 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1197 | duprintf("get_entries: %u != %zu\n", |
1198 | *len, sizeof(get) + get.size); | |
d924357c PM |
1199 | return -EINVAL; |
1200 | } | |
1201 | ||
336b517f | 1202 | t = xt_find_table_lock(net, AF_INET6, get.name); |
6b7d31fc | 1203 | if (t && !IS_ERR(t)) { |
2e4e6a17 HW |
1204 | struct xt_table_info *private = t->private; |
1205 | duprintf("t->private->number = %u\n", private->number); | |
d924357c | 1206 | if (get.size == private->size) |
2e4e6a17 | 1207 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
1208 | t, uptr->entrytable); |
1209 | else { | |
1210 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1211 | private->size, get.size); |
544473c1 | 1212 | ret = -EAGAIN; |
1da177e4 | 1213 | } |
6b7d31fc | 1214 | module_put(t->me); |
2e4e6a17 | 1215 | xt_table_unlock(t); |
1da177e4 | 1216 | } else |
6b7d31fc | 1217 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
1218 | |
1219 | return ret; | |
1220 | } | |
1221 | ||
1222 | static int | |
336b517f | 1223 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
3bc3fe5e PM |
1224 | struct xt_table_info *newinfo, unsigned int num_counters, |
1225 | void __user *counters_ptr) | |
1da177e4 LT |
1226 | { |
1227 | int ret; | |
2e4e6a17 | 1228 | struct xt_table *t; |
3bc3fe5e | 1229 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1230 | struct xt_counters *counters; |
5452e425 | 1231 | const void *loc_cpu_old_entry; |
72b2b1dd | 1232 | struct ip6t_entry *iter; |
1da177e4 | 1233 | |
3bc3fe5e PM |
1234 | ret = 0; |
1235 | counters = vmalloc_node(num_counters * sizeof(struct xt_counters), | |
3b84e92b | 1236 | numa_node_id()); |
1da177e4 LT |
1237 | if (!counters) { |
1238 | ret = -ENOMEM; | |
3bc3fe5e | 1239 | goto out; |
1da177e4 | 1240 | } |
1da177e4 | 1241 | |
336b517f | 1242 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
3bc3fe5e | 1243 | "ip6table_%s", name); |
6b7d31fc HW |
1244 | if (!t || IS_ERR(t)) { |
1245 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1246 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1247 | } |
1da177e4 LT |
1248 | |
1249 | /* You lied! */ | |
3bc3fe5e | 1250 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1251 | duprintf("Valid hook crap: %08X vs %08X\n", |
3bc3fe5e | 1252 | valid_hooks, t->valid_hooks); |
1da177e4 | 1253 | ret = -EINVAL; |
6b7d31fc | 1254 | goto put_module; |
1da177e4 LT |
1255 | } |
1256 | ||
3bc3fe5e | 1257 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1258 | if (!oldinfo) |
1259 | goto put_module; | |
1260 | ||
1261 | /* Update module usage count based on number of rules */ | |
1262 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1263 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1ab1457c YH |
1264 | if ((oldinfo->number > oldinfo->initial_entries) || |
1265 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1266 | module_put(t->me); |
1267 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1268 | (newinfo->number <= oldinfo->initial_entries)) | |
1269 | module_put(t->me); | |
1270 | ||
942e4a2b | 1271 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1272 | get_counters(oldinfo, counters); |
942e4a2b | 1273 | |
1da177e4 | 1274 | /* Decrease module usage counts and free resource */ |
31836064 | 1275 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
72b2b1dd | 1276 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1277 | cleanup_entry(iter, net); |
72b2b1dd | 1278 | |
2e4e6a17 | 1279 | xt_free_table_info(oldinfo); |
3bc3fe5e PM |
1280 | if (copy_to_user(counters_ptr, counters, |
1281 | sizeof(struct xt_counters) * num_counters) != 0) | |
1da177e4 LT |
1282 | ret = -EFAULT; |
1283 | vfree(counters); | |
2e4e6a17 | 1284 | xt_table_unlock(t); |
1da177e4 LT |
1285 | return ret; |
1286 | ||
1287 | put_module: | |
1288 | module_put(t->me); | |
2e4e6a17 | 1289 | xt_table_unlock(t); |
1da177e4 | 1290 | free_newinfo_counters_untrans: |
1da177e4 | 1291 | vfree(counters); |
3bc3fe5e PM |
1292 | out: |
1293 | return ret; | |
1294 | } | |
1295 | ||
1296 | static int | |
d5d1baa1 | 1297 | do_replace(struct net *net, const void __user *user, unsigned int len) |
3bc3fe5e PM |
1298 | { |
1299 | int ret; | |
1300 | struct ip6t_replace tmp; | |
1301 | struct xt_table_info *newinfo; | |
1302 | void *loc_cpu_entry; | |
72b2b1dd | 1303 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1304 | |
1305 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1306 | return -EFAULT; | |
1307 | ||
1308 | /* overflow check */ | |
1309 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1310 | return -ENOMEM; | |
1311 | ||
1312 | newinfo = xt_alloc_table_info(tmp.size); | |
1313 | if (!newinfo) | |
1314 | return -ENOMEM; | |
1315 | ||
1316 | /* choose the copy that is on our node/cpu */ | |
1317 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1318 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1319 | tmp.size) != 0) { | |
1320 | ret = -EFAULT; | |
1321 | goto free_newinfo; | |
1322 | } | |
1323 | ||
0f234214 | 1324 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
3bc3fe5e PM |
1325 | if (ret != 0) |
1326 | goto free_newinfo; | |
1327 | ||
1328 | duprintf("ip_tables: Translated table\n"); | |
1329 | ||
336b517f | 1330 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1331 | tmp.num_counters, tmp.counters); |
1332 | if (ret) | |
1333 | goto free_newinfo_untrans; | |
1334 | return 0; | |
1335 | ||
1336 | free_newinfo_untrans: | |
72b2b1dd | 1337 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1338 | cleanup_entry(iter, net); |
1da177e4 | 1339 | free_newinfo: |
2e4e6a17 | 1340 | xt_free_table_info(newinfo); |
1da177e4 LT |
1341 | return ret; |
1342 | } | |
1343 | ||
1da177e4 | 1344 | static int |
d5d1baa1 | 1345 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
336b517f | 1346 | int compat) |
1da177e4 | 1347 | { |
942e4a2b | 1348 | unsigned int i, curcpu; |
3bc3fe5e PM |
1349 | struct xt_counters_info tmp; |
1350 | struct xt_counters *paddc; | |
1351 | unsigned int num_counters; | |
1352 | char *name; | |
1353 | int size; | |
1354 | void *ptmp; | |
2e4e6a17 | 1355 | struct xt_table *t; |
5452e425 | 1356 | const struct xt_table_info *private; |
6b7d31fc | 1357 | int ret = 0; |
5452e425 | 1358 | const void *loc_cpu_entry; |
72b2b1dd | 1359 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1360 | #ifdef CONFIG_COMPAT |
1361 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1362 | |
3bc3fe5e PM |
1363 | if (compat) { |
1364 | ptmp = &compat_tmp; | |
1365 | size = sizeof(struct compat_xt_counters_info); | |
1366 | } else | |
1367 | #endif | |
1368 | { | |
1369 | ptmp = &tmp; | |
1370 | size = sizeof(struct xt_counters_info); | |
1371 | } | |
1372 | ||
1373 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1374 | return -EFAULT; |
1375 | ||
3bc3fe5e PM |
1376 | #ifdef CONFIG_COMPAT |
1377 | if (compat) { | |
1378 | num_counters = compat_tmp.num_counters; | |
1379 | name = compat_tmp.name; | |
1380 | } else | |
1381 | #endif | |
1382 | { | |
1383 | num_counters = tmp.num_counters; | |
1384 | name = tmp.name; | |
1385 | } | |
1386 | ||
1387 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1388 | return -EINVAL; |
1389 | ||
3bc3fe5e | 1390 | paddc = vmalloc_node(len - size, numa_node_id()); |
1da177e4 LT |
1391 | if (!paddc) |
1392 | return -ENOMEM; | |
1393 | ||
3bc3fe5e | 1394 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1395 | ret = -EFAULT; |
1396 | goto free; | |
1397 | } | |
1398 | ||
336b517f | 1399 | t = xt_find_table_lock(net, AF_INET6, name); |
6b7d31fc HW |
1400 | if (!t || IS_ERR(t)) { |
1401 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1402 | goto free; |
6b7d31fc | 1403 | } |
1da177e4 | 1404 | |
942e4a2b SH |
1405 | |
1406 | local_bh_disable(); | |
2e4e6a17 | 1407 | private = t->private; |
3bc3fe5e | 1408 | if (private->number != num_counters) { |
1da177e4 LT |
1409 | ret = -EINVAL; |
1410 | goto unlock_up_free; | |
1411 | } | |
1412 | ||
1413 | i = 0; | |
31836064 | 1414 | /* Choose the copy that is on our node */ |
942e4a2b SH |
1415 | curcpu = smp_processor_id(); |
1416 | xt_info_wrlock(curcpu); | |
1417 | loc_cpu_entry = private->entries[curcpu]; | |
0559518b JE |
1418 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1419 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1420 | ++i; | |
1421 | } | |
942e4a2b SH |
1422 | xt_info_wrunlock(curcpu); |
1423 | ||
1da177e4 | 1424 | unlock_up_free: |
942e4a2b | 1425 | local_bh_enable(); |
2e4e6a17 | 1426 | xt_table_unlock(t); |
6b7d31fc | 1427 | module_put(t->me); |
1da177e4 LT |
1428 | free: |
1429 | vfree(paddc); | |
1430 | ||
1431 | return ret; | |
1432 | } | |
1433 | ||
3bc3fe5e PM |
1434 | #ifdef CONFIG_COMPAT |
1435 | struct compat_ip6t_replace { | |
1436 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1437 | u32 valid_hooks; | |
1438 | u32 num_entries; | |
1439 | u32 size; | |
1440 | u32 hook_entry[NF_INET_NUMHOOKS]; | |
1441 | u32 underflow[NF_INET_NUMHOOKS]; | |
1442 | u32 num_counters; | |
1443 | compat_uptr_t counters; /* struct ip6t_counters * */ | |
1444 | struct compat_ip6t_entry entries[0]; | |
1445 | }; | |
1446 | ||
1447 | static int | |
1448 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, | |
b0a6363c | 1449 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1450 | unsigned int i) |
3bc3fe5e PM |
1451 | { |
1452 | struct ip6t_entry_target *t; | |
1453 | struct compat_ip6t_entry __user *ce; | |
1454 | u_int16_t target_offset, next_offset; | |
1455 | compat_uint_t origsize; | |
dcea992a JE |
1456 | const struct xt_entry_match *ematch; |
1457 | int ret = 0; | |
3bc3fe5e | 1458 | |
3bc3fe5e PM |
1459 | origsize = *size; |
1460 | ce = (struct compat_ip6t_entry __user *)*dstptr; | |
0559518b JE |
1461 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
1462 | copy_to_user(&ce->counters, &counters[i], | |
1463 | sizeof(counters[i])) != 0) | |
1464 | return -EFAULT; | |
3bc3fe5e PM |
1465 | |
1466 | *dstptr += sizeof(struct compat_ip6t_entry); | |
1467 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1468 | ||
dcea992a JE |
1469 | xt_ematch_foreach(ematch, e) { |
1470 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1471 | if (ret != 0) | |
6bdb331b | 1472 | return ret; |
dcea992a | 1473 | } |
3bc3fe5e | 1474 | target_offset = e->target_offset - (origsize - *size); |
3bc3fe5e PM |
1475 | t = ip6t_get_target(e); |
1476 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1477 | if (ret) | |
0559518b | 1478 | return ret; |
3bc3fe5e | 1479 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1480 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1481 | put_user(next_offset, &ce->next_offset) != 0) | |
1482 | return -EFAULT; | |
3bc3fe5e | 1483 | return 0; |
3bc3fe5e PM |
1484 | } |
1485 | ||
022748a9 | 1486 | static int |
3bc3fe5e PM |
1487 | compat_find_calc_match(struct ip6t_entry_match *m, |
1488 | const char *name, | |
1489 | const struct ip6t_ip6 *ipv6, | |
1490 | unsigned int hookmask, | |
6bdb331b | 1491 | int *size) |
3bc3fe5e PM |
1492 | { |
1493 | struct xt_match *match; | |
1494 | ||
fd0ec0e6 JE |
1495 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
1496 | m->u.user.revision); | |
1497 | if (IS_ERR(match)) { | |
3bc3fe5e PM |
1498 | duprintf("compat_check_calc_match: `%s' not found\n", |
1499 | m->u.user.name); | |
fd0ec0e6 | 1500 | return PTR_ERR(match); |
3bc3fe5e PM |
1501 | } |
1502 | m->u.kernel.match = match; | |
1503 | *size += xt_compat_match_offset(match); | |
3bc3fe5e PM |
1504 | return 0; |
1505 | } | |
1506 | ||
0559518b | 1507 | static void compat_release_entry(struct compat_ip6t_entry *e) |
3bc3fe5e PM |
1508 | { |
1509 | struct ip6t_entry_target *t; | |
dcea992a | 1510 | struct xt_entry_match *ematch; |
3bc3fe5e | 1511 | |
3bc3fe5e | 1512 | /* Cleanup all matches */ |
dcea992a | 1513 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1514 | module_put(ematch->u.kernel.match->me); |
3bc3fe5e PM |
1515 | t = compat_ip6t_get_target(e); |
1516 | module_put(t->u.kernel.target->me); | |
3bc3fe5e PM |
1517 | } |
1518 | ||
022748a9 | 1519 | static int |
3bc3fe5e PM |
1520 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
1521 | struct xt_table_info *newinfo, | |
1522 | unsigned int *size, | |
d5d1baa1 JE |
1523 | const unsigned char *base, |
1524 | const unsigned char *limit, | |
1525 | const unsigned int *hook_entries, | |
1526 | const unsigned int *underflows, | |
3bc3fe5e PM |
1527 | const char *name) |
1528 | { | |
dcea992a | 1529 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1530 | struct ip6t_entry_target *t; |
1531 | struct xt_target *target; | |
1532 | unsigned int entry_offset; | |
b0a6363c PM |
1533 | unsigned int j; |
1534 | int ret, off, h; | |
3bc3fe5e PM |
1535 | |
1536 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1537 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
1538 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { | |
3bc3fe5e PM |
1539 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1540 | return -EINVAL; | |
1541 | } | |
1542 | ||
1543 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + | |
1544 | sizeof(struct compat_xt_entry_target)) { | |
1545 | duprintf("checking: element %p size %u\n", | |
1546 | e, e->next_offset); | |
1547 | return -EINVAL; | |
1548 | } | |
1549 | ||
1550 | /* For purposes of check_entry casting the compat entry is fine */ | |
1551 | ret = check_entry((struct ip6t_entry *)e, name); | |
1552 | if (ret) | |
1553 | return ret; | |
1554 | ||
1555 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1556 | entry_offset = (void *)e - (void *)base; | |
1557 | j = 0; | |
dcea992a JE |
1558 | xt_ematch_foreach(ematch, e) { |
1559 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1560 | &e->ipv6, e->comefrom, &off); |
dcea992a | 1561 | if (ret != 0) |
6bdb331b JE |
1562 | goto release_matches; |
1563 | ++j; | |
dcea992a | 1564 | } |
3bc3fe5e PM |
1565 | |
1566 | t = compat_ip6t_get_target(e); | |
d2a7b6ba JE |
1567 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
1568 | t->u.user.revision); | |
1569 | if (IS_ERR(target)) { | |
3bc3fe5e PM |
1570 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
1571 | t->u.user.name); | |
d2a7b6ba | 1572 | ret = PTR_ERR(target); |
3bc3fe5e PM |
1573 | goto release_matches; |
1574 | } | |
1575 | t->u.kernel.target = target; | |
1576 | ||
1577 | off += xt_compat_target_offset(target); | |
1578 | *size += off; | |
1579 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); | |
1580 | if (ret) | |
1581 | goto out; | |
1582 | ||
1583 | /* Check hooks & underflows */ | |
1584 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1585 | if ((unsigned char *)e - base == hook_entries[h]) | |
1586 | newinfo->hook_entry[h] = hook_entries[h]; | |
1587 | if ((unsigned char *)e - base == underflows[h]) | |
1588 | newinfo->underflow[h] = underflows[h]; | |
1589 | } | |
1590 | ||
1591 | /* Clear counters and comefrom */ | |
1592 | memset(&e->counters, 0, sizeof(e->counters)); | |
1593 | e->comefrom = 0; | |
3bc3fe5e PM |
1594 | return 0; |
1595 | ||
1596 | out: | |
1597 | module_put(t->u.kernel.target->me); | |
1598 | release_matches: | |
6bdb331b JE |
1599 | xt_ematch_foreach(ematch, e) { |
1600 | if (j-- == 0) | |
dcea992a | 1601 | break; |
6bdb331b JE |
1602 | module_put(ematch->u.kernel.match->me); |
1603 | } | |
3bc3fe5e PM |
1604 | return ret; |
1605 | } | |
1606 | ||
1607 | static int | |
1608 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, | |
1609 | unsigned int *size, const char *name, | |
1610 | struct xt_table_info *newinfo, unsigned char *base) | |
1611 | { | |
1612 | struct ip6t_entry_target *t; | |
1613 | struct xt_target *target; | |
1614 | struct ip6t_entry *de; | |
1615 | unsigned int origsize; | |
1616 | int ret, h; | |
dcea992a | 1617 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1618 | |
1619 | ret = 0; | |
1620 | origsize = *size; | |
1621 | de = (struct ip6t_entry *)*dstptr; | |
1622 | memcpy(de, e, sizeof(struct ip6t_entry)); | |
1623 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1624 | ||
1625 | *dstptr += sizeof(struct ip6t_entry); | |
1626 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); | |
1627 | ||
dcea992a JE |
1628 | xt_ematch_foreach(ematch, e) { |
1629 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1630 | if (ret != 0) | |
6bdb331b | 1631 | return ret; |
dcea992a | 1632 | } |
3bc3fe5e PM |
1633 | de->target_offset = e->target_offset - (origsize - *size); |
1634 | t = compat_ip6t_get_target(e); | |
1635 | target = t->u.kernel.target; | |
1636 | xt_compat_target_from_user(t, dstptr, size); | |
1637 | ||
1638 | de->next_offset = e->next_offset - (origsize - *size); | |
1639 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { | |
1640 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1641 | newinfo->hook_entry[h] -= origsize - *size; | |
1642 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1643 | newinfo->underflow[h] -= origsize - *size; | |
1644 | } | |
1645 | return ret; | |
1646 | } | |
1647 | ||
f54e9367 | 1648 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
0559518b | 1649 | const char *name) |
3bc3fe5e | 1650 | { |
b0a6363c | 1651 | unsigned int j; |
dcea992a | 1652 | int ret = 0; |
9b4fce7a | 1653 | struct xt_mtchk_param mtpar; |
dcea992a | 1654 | struct xt_entry_match *ematch; |
3bc3fe5e PM |
1655 | |
1656 | j = 0; | |
f54e9367 | 1657 | mtpar.net = net; |
9b4fce7a JE |
1658 | mtpar.table = name; |
1659 | mtpar.entryinfo = &e->ipv6; | |
1660 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1661 | mtpar.family = NFPROTO_IPV6; |
dcea992a | 1662 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1663 | ret = check_match(ematch, &mtpar); |
dcea992a | 1664 | if (ret != 0) |
6bdb331b JE |
1665 | goto cleanup_matches; |
1666 | ++j; | |
dcea992a | 1667 | } |
3bc3fe5e | 1668 | |
add67461 | 1669 | ret = check_target(e, net, name); |
3bc3fe5e PM |
1670 | if (ret) |
1671 | goto cleanup_matches; | |
3bc3fe5e PM |
1672 | return 0; |
1673 | ||
1674 | cleanup_matches: | |
6bdb331b JE |
1675 | xt_ematch_foreach(ematch, e) { |
1676 | if (j-- == 0) | |
dcea992a | 1677 | break; |
6bdb331b JE |
1678 | cleanup_match(ematch, net); |
1679 | } | |
3bc3fe5e PM |
1680 | return ret; |
1681 | } | |
1682 | ||
1683 | static int | |
f54e9367 AD |
1684 | translate_compat_table(struct net *net, |
1685 | const char *name, | |
3bc3fe5e PM |
1686 | unsigned int valid_hooks, |
1687 | struct xt_table_info **pinfo, | |
1688 | void **pentry0, | |
1689 | unsigned int total_size, | |
1690 | unsigned int number, | |
1691 | unsigned int *hook_entries, | |
1692 | unsigned int *underflows) | |
1693 | { | |
1694 | unsigned int i, j; | |
1695 | struct xt_table_info *newinfo, *info; | |
1696 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1697 | struct compat_ip6t_entry *iter0; |
1698 | struct ip6t_entry *iter1; | |
3bc3fe5e | 1699 | unsigned int size; |
72b2b1dd | 1700 | int ret = 0; |
3bc3fe5e PM |
1701 | |
1702 | info = *pinfo; | |
1703 | entry0 = *pentry0; | |
1704 | size = total_size; | |
1705 | info->number = number; | |
1706 | ||
1707 | /* Init all hooks to impossible value. */ | |
1708 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1709 | info->hook_entry[i] = 0xFFFFFFFF; | |
1710 | info->underflow[i] = 0xFFFFFFFF; | |
1711 | } | |
1712 | ||
1713 | duprintf("translate_compat_table: size %u\n", info->size); | |
1714 | j = 0; | |
1715 | xt_compat_lock(AF_INET6); | |
1716 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
1717 | xt_entry_foreach(iter0, entry0, total_size) { |
1718 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1719 | entry0, |
1720 | entry0 + total_size, | |
1721 | hook_entries, | |
1722 | underflows, | |
1723 | name); | |
72b2b1dd | 1724 | if (ret != 0) |
0559518b JE |
1725 | goto out_unlock; |
1726 | ++j; | |
72b2b1dd | 1727 | } |
3bc3fe5e PM |
1728 | |
1729 | ret = -EINVAL; | |
1730 | if (j != number) { | |
1731 | duprintf("translate_compat_table: %u not %u entries\n", | |
1732 | j, number); | |
1733 | goto out_unlock; | |
1734 | } | |
1735 | ||
1736 | /* Check hooks all assigned */ | |
1737 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1738 | /* Only hooks which are valid */ | |
1739 | if (!(valid_hooks & (1 << i))) | |
1740 | continue; | |
1741 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1742 | duprintf("Invalid hook entry %u %u\n", | |
1743 | i, hook_entries[i]); | |
1744 | goto out_unlock; | |
1745 | } | |
1746 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1747 | duprintf("Invalid underflow %u %u\n", | |
1748 | i, underflows[i]); | |
1749 | goto out_unlock; | |
1750 | } | |
1751 | } | |
1752 | ||
1753 | ret = -ENOMEM; | |
1754 | newinfo = xt_alloc_table_info(size); | |
1755 | if (!newinfo) | |
1756 | goto out_unlock; | |
1757 | ||
1758 | newinfo->number = number; | |
1759 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { | |
1760 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1761 | newinfo->underflow[i] = info->underflow[i]; | |
1762 | } | |
1763 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1764 | pos = entry1; | |
1765 | size = total_size; | |
72b2b1dd | 1766 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1767 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1768 | name, newinfo, entry1); | |
72b2b1dd JE |
1769 | if (ret != 0) |
1770 | break; | |
1771 | } | |
3bc3fe5e PM |
1772 | xt_compat_flush_offsets(AF_INET6); |
1773 | xt_compat_unlock(AF_INET6); | |
1774 | if (ret) | |
1775 | goto free_newinfo; | |
1776 | ||
1777 | ret = -ELOOP; | |
1778 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1779 | goto free_newinfo; | |
1780 | ||
1781 | i = 0; | |
72b2b1dd | 1782 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1783 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1784 | if (ret != 0) |
1785 | break; | |
0559518b | 1786 | ++i; |
72b2b1dd | 1787 | } |
3bc3fe5e | 1788 | if (ret) { |
72b2b1dd JE |
1789 | /* |
1790 | * The first i matches need cleanup_entry (calls ->destroy) | |
1791 | * because they had called ->check already. The other j-i | |
1792 | * entries need only release. | |
1793 | */ | |
1794 | int skip = i; | |
3bc3fe5e | 1795 | j -= i; |
72b2b1dd JE |
1796 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1797 | if (skip-- > 0) | |
1798 | continue; | |
0559518b | 1799 | if (j-- == 0) |
72b2b1dd | 1800 | break; |
0559518b | 1801 | compat_release_entry(iter0); |
72b2b1dd | 1802 | } |
0559518b JE |
1803 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1804 | if (i-- == 0) | |
72b2b1dd | 1805 | break; |
0559518b JE |
1806 | cleanup_entry(iter1, net); |
1807 | } | |
3bc3fe5e PM |
1808 | xt_free_table_info(newinfo); |
1809 | return ret; | |
1810 | } | |
1811 | ||
1812 | /* And one copy for every other CPU */ | |
1813 | for_each_possible_cpu(i) | |
1814 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1815 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1816 | ||
1817 | *pinfo = newinfo; | |
1818 | *pentry0 = entry1; | |
1819 | xt_free_table_info(info); | |
1820 | return 0; | |
1821 | ||
1822 | free_newinfo: | |
1823 | xt_free_table_info(newinfo); | |
1824 | out: | |
0559518b JE |
1825 | xt_entry_foreach(iter0, entry0, total_size) { |
1826 | if (j-- == 0) | |
72b2b1dd | 1827 | break; |
0559518b JE |
1828 | compat_release_entry(iter0); |
1829 | } | |
3bc3fe5e PM |
1830 | return ret; |
1831 | out_unlock: | |
1832 | xt_compat_flush_offsets(AF_INET6); | |
1833 | xt_compat_unlock(AF_INET6); | |
1834 | goto out; | |
1835 | } | |
1836 | ||
1837 | static int | |
336b517f | 1838 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
3bc3fe5e PM |
1839 | { |
1840 | int ret; | |
1841 | struct compat_ip6t_replace tmp; | |
1842 | struct xt_table_info *newinfo; | |
1843 | void *loc_cpu_entry; | |
72b2b1dd | 1844 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1845 | |
1846 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1847 | return -EFAULT; | |
1848 | ||
1849 | /* overflow check */ | |
1850 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1851 | return -ENOMEM; | |
1852 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1853 | return -ENOMEM; | |
1854 | ||
1855 | newinfo = xt_alloc_table_info(tmp.size); | |
1856 | if (!newinfo) | |
1857 | return -ENOMEM; | |
1858 | ||
9c547959 | 1859 | /* choose the copy that is on our node/cpu */ |
3bc3fe5e PM |
1860 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1861 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1862 | tmp.size) != 0) { | |
1863 | ret = -EFAULT; | |
1864 | goto free_newinfo; | |
1865 | } | |
1866 | ||
f54e9367 | 1867 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
3bc3fe5e PM |
1868 | &newinfo, &loc_cpu_entry, tmp.size, |
1869 | tmp.num_entries, tmp.hook_entry, | |
1870 | tmp.underflow); | |
1871 | if (ret != 0) | |
1872 | goto free_newinfo; | |
1873 | ||
1874 | duprintf("compat_do_replace: Translated table\n"); | |
1875 | ||
336b517f | 1876 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
3bc3fe5e PM |
1877 | tmp.num_counters, compat_ptr(tmp.counters)); |
1878 | if (ret) | |
1879 | goto free_newinfo_untrans; | |
1880 | return 0; | |
1881 | ||
1882 | free_newinfo_untrans: | |
72b2b1dd | 1883 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1884 | cleanup_entry(iter, net); |
3bc3fe5e PM |
1885 | free_newinfo: |
1886 | xt_free_table_info(newinfo); | |
1887 | return ret; | |
1888 | } | |
1889 | ||
1890 | static int | |
1891 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1892 | unsigned int len) | |
1893 | { | |
1894 | int ret; | |
1895 | ||
1896 | if (!capable(CAP_NET_ADMIN)) | |
1897 | return -EPERM; | |
1898 | ||
1899 | switch (cmd) { | |
1900 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 1901 | ret = compat_do_replace(sock_net(sk), user, len); |
3bc3fe5e PM |
1902 | break; |
1903 | ||
1904 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1905 | ret = do_add_counters(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
1906 | break; |
1907 | ||
1908 | default: | |
1909 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
1910 | ret = -EINVAL; | |
1911 | } | |
1912 | ||
1913 | return ret; | |
1914 | } | |
1915 | ||
1916 | struct compat_ip6t_get_entries { | |
1917 | char name[IP6T_TABLE_MAXNAMELEN]; | |
1918 | compat_uint_t size; | |
1919 | struct compat_ip6t_entry entrytable[0]; | |
1920 | }; | |
1921 | ||
1922 | static int | |
1923 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1924 | void __user *userptr) | |
1925 | { | |
1926 | struct xt_counters *counters; | |
5452e425 | 1927 | const struct xt_table_info *private = table->private; |
3bc3fe5e PM |
1928 | void __user *pos; |
1929 | unsigned int size; | |
1930 | int ret = 0; | |
5452e425 | 1931 | const void *loc_cpu_entry; |
3bc3fe5e | 1932 | unsigned int i = 0; |
72b2b1dd | 1933 | struct ip6t_entry *iter; |
3bc3fe5e PM |
1934 | |
1935 | counters = alloc_counters(table); | |
1936 | if (IS_ERR(counters)) | |
1937 | return PTR_ERR(counters); | |
1938 | ||
1939 | /* choose the copy that is on our node/cpu, ... | |
1940 | * This choice is lazy (because current thread is | |
1941 | * allowed to migrate to another cpu) | |
1942 | */ | |
1943 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1944 | pos = userptr; | |
1945 | size = total_size; | |
72b2b1dd JE |
1946 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1947 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1948 | &size, counters, i++); |
72b2b1dd JE |
1949 | if (ret != 0) |
1950 | break; | |
1951 | } | |
3bc3fe5e PM |
1952 | |
1953 | vfree(counters); | |
1954 | return ret; | |
1955 | } | |
1956 | ||
1957 | static int | |
336b517f AD |
1958 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
1959 | int *len) | |
3bc3fe5e PM |
1960 | { |
1961 | int ret; | |
1962 | struct compat_ip6t_get_entries get; | |
1963 | struct xt_table *t; | |
1964 | ||
1965 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1966 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
3bc3fe5e PM |
1967 | return -EINVAL; |
1968 | } | |
1969 | ||
1970 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1971 | return -EFAULT; | |
1972 | ||
1973 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { | |
c9d8fe13 PM |
1974 | duprintf("compat_get_entries: %u != %zu\n", |
1975 | *len, sizeof(get) + get.size); | |
3bc3fe5e PM |
1976 | return -EINVAL; |
1977 | } | |
1978 | ||
1979 | xt_compat_lock(AF_INET6); | |
336b517f | 1980 | t = xt_find_table_lock(net, AF_INET6, get.name); |
3bc3fe5e | 1981 | if (t && !IS_ERR(t)) { |
5452e425 | 1982 | const struct xt_table_info *private = t->private; |
3bc3fe5e | 1983 | struct xt_table_info info; |
9c547959 | 1984 | duprintf("t->private->number = %u\n", private->number); |
3bc3fe5e PM |
1985 | ret = compat_table_info(private, &info); |
1986 | if (!ret && get.size == info.size) { | |
1987 | ret = compat_copy_entries_to_user(private->size, | |
1988 | t, uptr->entrytable); | |
1989 | } else if (!ret) { | |
1990 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1991 | private->size, get.size); |
544473c1 | 1992 | ret = -EAGAIN; |
3bc3fe5e PM |
1993 | } |
1994 | xt_compat_flush_offsets(AF_INET6); | |
1995 | module_put(t->me); | |
1996 | xt_table_unlock(t); | |
1997 | } else | |
1998 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1999 | ||
2000 | xt_compat_unlock(AF_INET6); | |
2001 | return ret; | |
2002 | } | |
2003 | ||
2004 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); | |
2005 | ||
2006 | static int | |
2007 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2008 | { | |
2009 | int ret; | |
2010 | ||
2011 | if (!capable(CAP_NET_ADMIN)) | |
2012 | return -EPERM; | |
2013 | ||
2014 | switch (cmd) { | |
2015 | case IP6T_SO_GET_INFO: | |
3b1e0a65 | 2016 | ret = get_info(sock_net(sk), user, len, 1); |
3bc3fe5e PM |
2017 | break; |
2018 | case IP6T_SO_GET_ENTRIES: | |
3b1e0a65 | 2019 | ret = compat_get_entries(sock_net(sk), user, len); |
3bc3fe5e PM |
2020 | break; |
2021 | default: | |
2022 | ret = do_ip6t_get_ctl(sk, cmd, user, len); | |
2023 | } | |
2024 | return ret; | |
2025 | } | |
2026 | #endif | |
2027 | ||
1da177e4 LT |
2028 | static int |
2029 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
2030 | { | |
2031 | int ret; | |
2032 | ||
2033 | if (!capable(CAP_NET_ADMIN)) | |
2034 | return -EPERM; | |
2035 | ||
2036 | switch (cmd) { | |
2037 | case IP6T_SO_SET_REPLACE: | |
3b1e0a65 | 2038 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2039 | break; |
2040 | ||
2041 | case IP6T_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2042 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2043 | break; |
2044 | ||
2045 | default: | |
2046 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); | |
2047 | ret = -EINVAL; | |
2048 | } | |
2049 | ||
2050 | return ret; | |
2051 | } | |
2052 | ||
2053 | static int | |
2054 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2055 | { | |
2056 | int ret; | |
2057 | ||
2058 | if (!capable(CAP_NET_ADMIN)) | |
2059 | return -EPERM; | |
2060 | ||
2061 | switch (cmd) { | |
433665c9 | 2062 | case IP6T_SO_GET_INFO: |
3b1e0a65 | 2063 | ret = get_info(sock_net(sk), user, len, 0); |
433665c9 | 2064 | break; |
1da177e4 | 2065 | |
d924357c | 2066 | case IP6T_SO_GET_ENTRIES: |
3b1e0a65 | 2067 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2068 | break; |
1da177e4 | 2069 | |
6b7d31fc HW |
2070 | case IP6T_SO_GET_REVISION_MATCH: |
2071 | case IP6T_SO_GET_REVISION_TARGET: { | |
2072 | struct ip6t_get_revision rev; | |
2e4e6a17 | 2073 | int target; |
6b7d31fc HW |
2074 | |
2075 | if (*len != sizeof(rev)) { | |
2076 | ret = -EINVAL; | |
2077 | break; | |
2078 | } | |
2079 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2080 | ret = -EFAULT; | |
2081 | break; | |
2082 | } | |
2083 | ||
2084 | if (cmd == IP6T_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2085 | target = 1; |
6b7d31fc | 2086 | else |
2e4e6a17 | 2087 | target = 0; |
6b7d31fc | 2088 | |
2e4e6a17 HW |
2089 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
2090 | rev.revision, | |
2091 | target, &ret), | |
6b7d31fc HW |
2092 | "ip6t_%s", rev.name); |
2093 | break; | |
2094 | } | |
2095 | ||
1da177e4 LT |
2096 | default: |
2097 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); | |
2098 | ret = -EINVAL; | |
2099 | } | |
2100 | ||
2101 | return ret; | |
2102 | } | |
2103 | ||
35aad0ff JE |
2104 | struct xt_table *ip6t_register_table(struct net *net, |
2105 | const struct xt_table *table, | |
336b517f | 2106 | const struct ip6t_replace *repl) |
1da177e4 LT |
2107 | { |
2108 | int ret; | |
2e4e6a17 | 2109 | struct xt_table_info *newinfo; |
f3c5c1bf | 2110 | struct xt_table_info bootstrap = {0}; |
31836064 | 2111 | void *loc_cpu_entry; |
a98da11d | 2112 | struct xt_table *new_table; |
1da177e4 | 2113 | |
2e4e6a17 | 2114 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2115 | if (!newinfo) { |
2116 | ret = -ENOMEM; | |
2117 | goto out; | |
2118 | } | |
1da177e4 | 2119 | |
9c547959 | 2120 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2121 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2122 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2123 | |
0f234214 | 2124 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2125 | if (ret != 0) |
2126 | goto out_free; | |
1da177e4 | 2127 | |
336b517f | 2128 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2129 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2130 | ret = PTR_ERR(new_table); |
2131 | goto out_free; | |
1da177e4 | 2132 | } |
44d34e72 | 2133 | return new_table; |
1da177e4 | 2134 | |
44d34e72 AD |
2135 | out_free: |
2136 | xt_free_table_info(newinfo); | |
2137 | out: | |
2138 | return ERR_PTR(ret); | |
1da177e4 LT |
2139 | } |
2140 | ||
f54e9367 | 2141 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2142 | { |
2e4e6a17 | 2143 | struct xt_table_info *private; |
31836064 | 2144 | void *loc_cpu_entry; |
df200969 | 2145 | struct module *table_owner = table->me; |
72b2b1dd | 2146 | struct ip6t_entry *iter; |
31836064 | 2147 | |
2e4e6a17 | 2148 | private = xt_unregister_table(table); |
1da177e4 LT |
2149 | |
2150 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2151 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2152 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2153 | cleanup_entry(iter, net); |
df200969 AD |
2154 | if (private->number > private->initial_entries) |
2155 | module_put(table_owner); | |
2e4e6a17 | 2156 | xt_free_table_info(private); |
1da177e4 LT |
2157 | } |
2158 | ||
2159 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
ccb79bdc | 2160 | static inline bool |
1da177e4 LT |
2161 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2162 | u_int8_t type, u_int8_t code, | |
ccb79bdc | 2163 | bool invert) |
1da177e4 LT |
2164 | { |
2165 | return (type == test_type && code >= min_code && code <= max_code) | |
2166 | ^ invert; | |
2167 | } | |
2168 | ||
1d93a9cb | 2169 | static bool |
f7108a20 | 2170 | icmp6_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2171 | { |
5452e425 JE |
2172 | const struct icmp6hdr *ic; |
2173 | struct icmp6hdr _icmph; | |
f7108a20 | 2174 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2175 | |
2176 | /* Must not be a fragment. */ | |
f7108a20 | 2177 | if (par->fragoff != 0) |
1d93a9cb | 2178 | return false; |
1da177e4 | 2179 | |
f7108a20 | 2180 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2181 | if (ic == NULL) { |
2182 | /* We've been asked to examine this packet, and we | |
9c547959 PM |
2183 | * can't. Hence, no choice but to drop. |
2184 | */ | |
1da177e4 | 2185 | duprintf("Dropping evil ICMP tinygram.\n"); |
f7108a20 | 2186 | *par->hotdrop = true; |
1d93a9cb | 2187 | return false; |
1da177e4 LT |
2188 | } |
2189 | ||
2190 | return icmp6_type_code_match(icmpinfo->type, | |
2191 | icmpinfo->code[0], | |
2192 | icmpinfo->code[1], | |
2193 | ic->icmp6_type, ic->icmp6_code, | |
2194 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); | |
2195 | } | |
2196 | ||
2197 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 2198 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2199 | { |
9b4fce7a | 2200 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2201 | |
7f939713 | 2202 | /* Must specify no unknown invflags */ |
bd414ee6 | 2203 | return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2204 | } |
2205 | ||
2206 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2207 | static struct xt_target ip6t_standard_target __read_mostly = { |
1da177e4 | 2208 | .name = IP6T_STANDARD_TARGET, |
7f939713 | 2209 | .targetsize = sizeof(int), |
4ba351cf | 2210 | .family = NFPROTO_IPV6, |
3bc3fe5e PM |
2211 | #ifdef CONFIG_COMPAT |
2212 | .compatsize = sizeof(compat_int_t), | |
2213 | .compat_from_user = compat_standard_from_user, | |
2214 | .compat_to_user = compat_standard_to_user, | |
2215 | #endif | |
1da177e4 LT |
2216 | }; |
2217 | ||
9f15c530 | 2218 | static struct xt_target ip6t_error_target __read_mostly = { |
1da177e4 LT |
2219 | .name = IP6T_ERROR_TARGET, |
2220 | .target = ip6t_error, | |
7f939713 | 2221 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, |
4ba351cf | 2222 | .family = NFPROTO_IPV6, |
1da177e4 LT |
2223 | }; |
2224 | ||
2225 | static struct nf_sockopt_ops ip6t_sockopts = { | |
2226 | .pf = PF_INET6, | |
2227 | .set_optmin = IP6T_BASE_CTL, | |
2228 | .set_optmax = IP6T_SO_SET_MAX+1, | |
2229 | .set = do_ip6t_set_ctl, | |
3bc3fe5e PM |
2230 | #ifdef CONFIG_COMPAT |
2231 | .compat_set = compat_do_ip6t_set_ctl, | |
2232 | #endif | |
1da177e4 LT |
2233 | .get_optmin = IP6T_BASE_CTL, |
2234 | .get_optmax = IP6T_SO_GET_MAX+1, | |
2235 | .get = do_ip6t_get_ctl, | |
3bc3fe5e PM |
2236 | #ifdef CONFIG_COMPAT |
2237 | .compat_get = compat_do_ip6t_get_ctl, | |
2238 | #endif | |
16fcec35 | 2239 | .owner = THIS_MODULE, |
1da177e4 LT |
2240 | }; |
2241 | ||
9f15c530 | 2242 | static struct xt_match icmp6_matchstruct __read_mostly = { |
1da177e4 | 2243 | .name = "icmp6", |
9c547959 | 2244 | .match = icmp6_match, |
7f939713 PM |
2245 | .matchsize = sizeof(struct ip6t_icmp), |
2246 | .checkentry = icmp6_checkentry, | |
2247 | .proto = IPPROTO_ICMPV6, | |
4ba351cf | 2248 | .family = NFPROTO_IPV6, |
1da177e4 LT |
2249 | }; |
2250 | ||
3cb609d5 AD |
2251 | static int __net_init ip6_tables_net_init(struct net *net) |
2252 | { | |
383ca5b8 | 2253 | return xt_proto_init(net, NFPROTO_IPV6); |
3cb609d5 AD |
2254 | } |
2255 | ||
2256 | static void __net_exit ip6_tables_net_exit(struct net *net) | |
2257 | { | |
383ca5b8 | 2258 | xt_proto_fini(net, NFPROTO_IPV6); |
3cb609d5 AD |
2259 | } |
2260 | ||
2261 | static struct pernet_operations ip6_tables_net_ops = { | |
2262 | .init = ip6_tables_net_init, | |
2263 | .exit = ip6_tables_net_exit, | |
2264 | }; | |
2265 | ||
65b4b4e8 | 2266 | static int __init ip6_tables_init(void) |
1da177e4 LT |
2267 | { |
2268 | int ret; | |
2269 | ||
3cb609d5 | 2270 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2271 | if (ret < 0) |
2272 | goto err1; | |
2e4e6a17 | 2273 | |
1da177e4 | 2274 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2275 | ret = xt_register_target(&ip6t_standard_target); |
2276 | if (ret < 0) | |
2277 | goto err2; | |
2278 | ret = xt_register_target(&ip6t_error_target); | |
2279 | if (ret < 0) | |
2280 | goto err3; | |
2281 | ret = xt_register_match(&icmp6_matchstruct); | |
2282 | if (ret < 0) | |
2283 | goto err4; | |
1da177e4 LT |
2284 | |
2285 | /* Register setsockopt */ | |
2286 | ret = nf_register_sockopt(&ip6t_sockopts); | |
0eff66e6 PM |
2287 | if (ret < 0) |
2288 | goto err5; | |
1da177e4 | 2289 | |
ff67e4e4 | 2290 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2291 | return 0; |
0eff66e6 PM |
2292 | |
2293 | err5: | |
2294 | xt_unregister_match(&icmp6_matchstruct); | |
2295 | err4: | |
2296 | xt_unregister_target(&ip6t_error_target); | |
2297 | err3: | |
2298 | xt_unregister_target(&ip6t_standard_target); | |
2299 | err2: | |
3cb609d5 | 2300 | unregister_pernet_subsys(&ip6_tables_net_ops); |
0eff66e6 PM |
2301 | err1: |
2302 | return ret; | |
1da177e4 LT |
2303 | } |
2304 | ||
65b4b4e8 | 2305 | static void __exit ip6_tables_fini(void) |
1da177e4 LT |
2306 | { |
2307 | nf_unregister_sockopt(&ip6t_sockopts); | |
9c547959 | 2308 | |
a45049c5 PNA |
2309 | xt_unregister_match(&icmp6_matchstruct); |
2310 | xt_unregister_target(&ip6t_error_target); | |
2311 | xt_unregister_target(&ip6t_standard_target); | |
3cb609d5 AD |
2312 | |
2313 | unregister_pernet_subsys(&ip6_tables_net_ops); | |
1da177e4 LT |
2314 | } |
2315 | ||
e674d0f3 | 2316 | /* |
b777e0ce PM |
2317 | * find the offset to specified header or the protocol number of last header |
2318 | * if target < 0. "last header" is transport protocol header, ESP, or | |
2319 | * "No next header". | |
2320 | * | |
2321 | * If target header is found, its offset is set in *offset and return protocol | |
2322 | * number. Otherwise, return -1. | |
2323 | * | |
6d381634 PM |
2324 | * If the first fragment doesn't contain the final protocol header or |
2325 | * NEXTHDR_NONE it is considered invalid. | |
2326 | * | |
b777e0ce PM |
2327 | * Note that non-1st fragment is special case that "the protocol number |
2328 | * of last header" is "next header" field in Fragment header. In this case, | |
2329 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff | |
2330 | * isn't NULL. | |
e674d0f3 | 2331 | * |
e674d0f3 | 2332 | */ |
b777e0ce PM |
2333 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
2334 | int target, unsigned short *fragoff) | |
e674d0f3 | 2335 | { |
6b88dd96 | 2336 | unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); |
0660e03f | 2337 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
e674d0f3 YK |
2338 | unsigned int len = skb->len - start; |
2339 | ||
b777e0ce PM |
2340 | if (fragoff) |
2341 | *fragoff = 0; | |
2342 | ||
e674d0f3 YK |
2343 | while (nexthdr != target) { |
2344 | struct ipv6_opt_hdr _hdr, *hp; | |
2345 | unsigned int hdrlen; | |
2346 | ||
b777e0ce PM |
2347 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
2348 | if (target < 0) | |
2349 | break; | |
6d381634 | 2350 | return -ENOENT; |
b777e0ce PM |
2351 | } |
2352 | ||
e674d0f3 YK |
2353 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
2354 | if (hp == NULL) | |
6d381634 | 2355 | return -EBADMSG; |
e674d0f3 | 2356 | if (nexthdr == NEXTHDR_FRAGMENT) { |
e69a4adc AV |
2357 | unsigned short _frag_off; |
2358 | __be16 *fp; | |
e674d0f3 YK |
2359 | fp = skb_header_pointer(skb, |
2360 | start+offsetof(struct frag_hdr, | |
2361 | frag_off), | |
2362 | sizeof(_frag_off), | |
2363 | &_frag_off); | |
2364 | if (fp == NULL) | |
6d381634 | 2365 | return -EBADMSG; |
e674d0f3 | 2366 | |
b777e0ce PM |
2367 | _frag_off = ntohs(*fp) & ~0x7; |
2368 | if (_frag_off) { | |
2369 | if (target < 0 && | |
2370 | ((!ipv6_ext_hdr(hp->nexthdr)) || | |
337dde79 | 2371 | hp->nexthdr == NEXTHDR_NONE)) { |
b777e0ce PM |
2372 | if (fragoff) |
2373 | *fragoff = _frag_off; | |
2374 | return hp->nexthdr; | |
2375 | } | |
6d381634 | 2376 | return -ENOENT; |
b777e0ce | 2377 | } |
e674d0f3 YK |
2378 | hdrlen = 8; |
2379 | } else if (nexthdr == NEXTHDR_AUTH) | |
1ab1457c | 2380 | hdrlen = (hp->hdrlen + 2) << 2; |
e674d0f3 | 2381 | else |
1ab1457c | 2382 | hdrlen = ipv6_optlen(hp); |
e674d0f3 YK |
2383 | |
2384 | nexthdr = hp->nexthdr; | |
2385 | len -= hdrlen; | |
2386 | start += hdrlen; | |
2387 | } | |
2388 | ||
2389 | *offset = start; | |
b777e0ce | 2390 | return nexthdr; |
e674d0f3 YK |
2391 | } |
2392 | ||
1da177e4 LT |
2393 | EXPORT_SYMBOL(ip6t_register_table); |
2394 | EXPORT_SYMBOL(ip6t_unregister_table); | |
2395 | EXPORT_SYMBOL(ip6t_do_table); | |
1da177e4 | 2396 | EXPORT_SYMBOL(ip6t_ext_hdr); |
e674d0f3 | 2397 | EXPORT_SYMBOL(ipv6_find_hdr); |
1da177e4 | 2398 | |
65b4b4e8 AM |
2399 | module_init(ip6_tables_init); |
2400 | module_exit(ip6_tables_fini); |