Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Packet matching code. | |
3 | * | |
4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
2e4e6a17 | 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 |
1da177e4 | 12 | #include <linux/cache.h> |
4fc268d2 | 13 | #include <linux/capability.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> | |
1da177e4 LT |
19 | #include <linux/icmp.h> |
20 | #include <net/ip.h> | |
2722971c | 21 | #include <net/compat.h> |
1da177e4 | 22 | #include <asm/uaccess.h> |
57b47a53 | 23 | #include <linux/mutex.h> |
1da177e4 LT |
24 | #include <linux/proc_fs.h> |
25 | #include <linux/err.h> | |
c8923c6b | 26 | #include <linux/cpumask.h> |
1da177e4 | 27 | |
2e4e6a17 | 28 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 29 | #include <linux/netfilter_ipv4/ip_tables.h> |
f01ffbd6 | 30 | #include <net/netfilter/nf_log.h> |
e3eaa991 | 31 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
32 | |
33 | MODULE_LICENSE("GPL"); | |
34 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
35 | MODULE_DESCRIPTION("IPv4 packet filter"); | |
36 | ||
37 | /*#define DEBUG_IP_FIREWALL*/ | |
38 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
39 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
40 | ||
41 | #ifdef DEBUG_IP_FIREWALL | |
ff67e4e4 | 42 | #define dprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
43 | #else |
44 | #define dprintf(format, args...) | |
45 | #endif | |
46 | ||
47 | #ifdef DEBUG_IP_FIREWALL_USER | |
ff67e4e4 | 48 | #define duprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
49 | #else |
50 | #define duprintf(format, args...) | |
51 | #endif | |
52 | ||
53 | #ifdef CONFIG_NETFILTER_DEBUG | |
54 | #define IP_NF_ASSERT(x) \ | |
55 | do { \ | |
56 | if (!(x)) \ | |
57 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ | |
0dc47877 | 58 | __func__, __FILE__, __LINE__); \ |
1da177e4 LT |
59 | } while(0) |
60 | #else | |
61 | #define IP_NF_ASSERT(x) | |
62 | #endif | |
1da177e4 LT |
63 | |
64 | #if 0 | |
65 | /* All the better to debug you with... */ | |
66 | #define static | |
67 | #define inline | |
68 | #endif | |
69 | ||
e3eaa991 JE |
70 | void *ipt_alloc_initial_table(const struct xt_table *info) |
71 | { | |
72 | return xt_alloc_initial_table(ipt, IPT); | |
73 | } | |
74 | EXPORT_SYMBOL_GPL(ipt_alloc_initial_table); | |
75 | ||
1da177e4 LT |
76 | /* |
77 | We keep a set of rules for each CPU, so we can avoid write-locking | |
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. | |
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 */ |
9c547959 | 87 | static inline bool |
1da177e4 LT |
88 | ip_packet_match(const struct iphdr *ip, |
89 | const char *indev, | |
90 | const char *outdev, | |
91 | const struct ipt_ip *ipinfo, | |
92 | int isfrag) | |
93 | { | |
1da177e4 LT |
94 | unsigned long ret; |
95 | ||
e79ec50b | 96 | #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) |
1da177e4 LT |
97 | |
98 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, | |
3666ed1c JP |
99 | IPT_INV_SRCIP) || |
100 | FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, | |
101 | IPT_INV_DSTIP)) { | |
1da177e4 LT |
102 | dprintf("Source or dest mismatch.\n"); |
103 | ||
cffee385 HH |
104 | dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n", |
105 | &ip->saddr, &ipinfo->smsk.s_addr, &ipinfo->src.s_addr, | |
1da177e4 | 106 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); |
cffee385 HH |
107 | dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n", |
108 | &ip->daddr, &ipinfo->dmsk.s_addr, &ipinfo->dst.s_addr, | |
1da177e4 | 109 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); |
9c547959 | 110 | return false; |
1da177e4 LT |
111 | } |
112 | ||
b8dfe498 | 113 | ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask); |
1da177e4 LT |
114 | |
115 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { | |
116 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
117 | indev, ipinfo->iniface, | |
118 | ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":""); | |
9c547959 | 119 | return false; |
1da177e4 LT |
120 | } |
121 | ||
b8dfe498 | 122 | ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
1da177e4 LT |
123 | |
124 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { | |
125 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
126 | outdev, ipinfo->outiface, | |
127 | ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":""); | |
9c547959 | 128 | return false; |
1da177e4 LT |
129 | } |
130 | ||
131 | /* Check specific protocol */ | |
3666ed1c JP |
132 | if (ipinfo->proto && |
133 | FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { | |
1da177e4 LT |
134 | dprintf("Packet protocol %hi does not match %hi.%s\n", |
135 | ip->protocol, ipinfo->proto, | |
136 | ipinfo->invflags&IPT_INV_PROTO ? " (INV)":""); | |
9c547959 | 137 | return false; |
1da177e4 LT |
138 | } |
139 | ||
140 | /* If we have a fragment rule but the packet is not a fragment | |
141 | * then we return zero */ | |
142 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { | |
143 | dprintf("Fragment rule but not fragment.%s\n", | |
144 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); | |
9c547959 | 145 | return false; |
1da177e4 LT |
146 | } |
147 | ||
9c547959 | 148 | return true; |
1da177e4 LT |
149 | } |
150 | ||
022748a9 | 151 | static bool |
1da177e4 LT |
152 | ip_checkentry(const struct ipt_ip *ip) |
153 | { | |
154 | if (ip->flags & ~IPT_F_MASK) { | |
155 | duprintf("Unknown flag bits set: %08X\n", | |
156 | ip->flags & ~IPT_F_MASK); | |
ccb79bdc | 157 | return false; |
1da177e4 LT |
158 | } |
159 | if (ip->invflags & ~IPT_INV_MASK) { | |
160 | duprintf("Unknown invflag bits set: %08X\n", | |
161 | ip->invflags & ~IPT_INV_MASK); | |
ccb79bdc | 162 | return false; |
1da177e4 | 163 | } |
ccb79bdc | 164 | return true; |
1da177e4 LT |
165 | } |
166 | ||
167 | static unsigned int | |
7eb35586 | 168 | ipt_error(struct sk_buff *skb, const struct xt_target_param *par) |
1da177e4 LT |
169 | { |
170 | if (net_ratelimit()) | |
ff67e4e4 | 171 | pr_info("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
172 | |
173 | return NF_DROP; | |
174 | } | |
175 | ||
022748a9 DV |
176 | /* Performance critical - called for every packet */ |
177 | static inline bool | |
d5d1baa1 | 178 | do_match(const struct ipt_entry_match *m, const struct sk_buff *skb, |
f7108a20 | 179 | struct xt_match_param *par) |
1da177e4 | 180 | { |
f7108a20 JE |
181 | par->match = m->u.kernel.match; |
182 | par->matchinfo = m->data; | |
183 | ||
1da177e4 | 184 | /* Stop iteration if it doesn't match */ |
f7108a20 | 185 | if (!m->u.kernel.match->match(skb, par)) |
1d93a9cb | 186 | return true; |
1da177e4 | 187 | else |
1d93a9cb | 188 | return false; |
1da177e4 LT |
189 | } |
190 | ||
022748a9 | 191 | /* Performance critical */ |
1da177e4 | 192 | static inline struct ipt_entry * |
d5d1baa1 | 193 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
194 | { |
195 | return (struct ipt_entry *)(base + offset); | |
196 | } | |
197 | ||
ba9dda3a | 198 | /* All zeroes == unconditional rule. */ |
022748a9 | 199 | /* Mildly perf critical (only if packet tracing is on) */ |
47901dc2 | 200 | static inline bool unconditional(const struct ipt_ip *ip) |
ba9dda3a | 201 | { |
47901dc2 | 202 | static const struct ipt_ip uncond; |
ba9dda3a | 203 | |
47901dc2 | 204 | return memcmp(ip, &uncond, sizeof(uncond)) == 0; |
e79ec50b | 205 | #undef FWINV |
ba9dda3a JK |
206 | } |
207 | ||
d5d1baa1 JE |
208 | /* for const-correctness */ |
209 | static inline const struct ipt_entry_target * | |
210 | ipt_get_target_c(const struct ipt_entry *e) | |
211 | { | |
212 | return ipt_get_target((struct ipt_entry *)e); | |
213 | } | |
214 | ||
ba9dda3a JK |
215 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
216 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
022748a9 | 217 | static const char *const hooknames[] = { |
6e23ae2a PM |
218 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
219 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 220 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
221 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
222 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
223 | }; |
224 | ||
225 | enum nf_ip_trace_comments { | |
226 | NF_IP_TRACE_COMMENT_RULE, | |
227 | NF_IP_TRACE_COMMENT_RETURN, | |
228 | NF_IP_TRACE_COMMENT_POLICY, | |
229 | }; | |
230 | ||
022748a9 | 231 | static const char *const comments[] = { |
ba9dda3a JK |
232 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
233 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
234 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
235 | }; | |
236 | ||
237 | static struct nf_loginfo trace_loginfo = { | |
238 | .type = NF_LOG_TYPE_LOG, | |
239 | .u = { | |
240 | .log = { | |
241 | .level = 4, | |
242 | .logflags = NF_LOG_MASK, | |
243 | }, | |
244 | }, | |
245 | }; | |
246 | ||
022748a9 | 247 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 248 | static inline int |
d5d1baa1 | 249 | get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e, |
4f2f6f23 JE |
250 | const char *hookname, const char **chainname, |
251 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 252 | { |
d5d1baa1 | 253 | const struct ipt_standard_target *t = (void *)ipt_get_target_c(s); |
ba9dda3a JK |
254 | |
255 | if (strcmp(t->target.u.kernel.target->name, IPT_ERROR_TARGET) == 0) { | |
256 | /* Head of user chain: ERROR target with chainname */ | |
257 | *chainname = t->target.data; | |
258 | (*rulenum) = 0; | |
259 | } else if (s == e) { | |
260 | (*rulenum)++; | |
261 | ||
3666ed1c JP |
262 | if (s->target_offset == sizeof(struct ipt_entry) && |
263 | strcmp(t->target.u.kernel.target->name, | |
264 | IPT_STANDARD_TARGET) == 0 && | |
265 | t->verdict < 0 && | |
266 | unconditional(&s->ip)) { | |
ba9dda3a JK |
267 | /* Tail of chains: STANDARD target (return/policy) */ |
268 | *comment = *chainname == hookname | |
4f2f6f23 JE |
269 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
270 | : comments[NF_IP_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
271 | } |
272 | return 1; | |
273 | } else | |
274 | (*rulenum)++; | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
d5d1baa1 | 279 | static void trace_packet(const struct sk_buff *skb, |
ba9dda3a JK |
280 | unsigned int hook, |
281 | const struct net_device *in, | |
282 | const struct net_device *out, | |
ecb6f85e | 283 | const char *tablename, |
d5d1baa1 JE |
284 | const struct xt_table_info *private, |
285 | const struct ipt_entry *e) | |
ba9dda3a | 286 | { |
d5d1baa1 | 287 | const void *table_base; |
5452e425 | 288 | const struct ipt_entry *root; |
4f2f6f23 | 289 | const char *hookname, *chainname, *comment; |
72b2b1dd | 290 | const struct ipt_entry *iter; |
ba9dda3a JK |
291 | unsigned int rulenum = 0; |
292 | ||
ccf5bd8c | 293 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
294 | root = get_entry(table_base, private->hook_entry[hook]); |
295 | ||
4f2f6f23 JE |
296 | hookname = chainname = hooknames[hook]; |
297 | comment = comments[NF_IP_TRACE_COMMENT_RULE]; | |
ba9dda3a | 298 | |
72b2b1dd JE |
299 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
300 | if (get_chainname_rulenum(iter, e, hookname, | |
301 | &chainname, &comment, &rulenum) != 0) | |
302 | break; | |
ba9dda3a JK |
303 | |
304 | nf_log_packet(AF_INET, hook, skb, in, out, &trace_loginfo, | |
305 | "TRACE: %s:%s:%s:%u ", | |
306 | tablename, chainname, comment, rulenum); | |
307 | } | |
308 | #endif | |
309 | ||
98e86403 JE |
310 | static inline __pure |
311 | struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry) | |
312 | { | |
313 | return (void *)entry + entry->next_offset; | |
314 | } | |
315 | ||
1da177e4 LT |
316 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
317 | unsigned int | |
3db05fea | 318 | ipt_do_table(struct sk_buff *skb, |
1da177e4 LT |
319 | unsigned int hook, |
320 | const struct net_device *in, | |
321 | const struct net_device *out, | |
e60a13e0 | 322 | struct xt_table *table) |
1da177e4 LT |
323 | { |
324 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); | |
5452e425 | 325 | const struct iphdr *ip; |
cff533ac | 326 | bool hotdrop = false; |
1da177e4 LT |
327 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
328 | unsigned int verdict = NF_DROP; | |
329 | const char *indev, *outdev; | |
d5d1baa1 | 330 | const void *table_base; |
f3c5c1bf JE |
331 | struct ipt_entry *e, **jumpstack; |
332 | unsigned int *stackptr, origptr, cpu; | |
d5d1baa1 | 333 | const struct xt_table_info *private; |
f7108a20 | 334 | struct xt_match_param mtpar; |
7eb35586 | 335 | struct xt_target_param tgpar; |
1da177e4 LT |
336 | |
337 | /* Initialization */ | |
3db05fea | 338 | ip = ip_hdr(skb); |
1da177e4 LT |
339 | indev = in ? in->name : nulldevname; |
340 | outdev = out ? out->name : nulldevname; | |
341 | /* We handle fragments by dealing with the first fragment as | |
342 | * if it was a normal packet. All other fragments are treated | |
343 | * normally, except that they will NEVER match rules that ask | |
344 | * things we don't know, ie. tcp syn flag or ports). If the | |
345 | * rule is also a fragment-specific rule, non-fragments won't | |
346 | * match it. */ | |
f7108a20 JE |
347 | mtpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
348 | mtpar.thoff = ip_hdrlen(skb); | |
349 | mtpar.hotdrop = &hotdrop; | |
7eb35586 JE |
350 | mtpar.in = tgpar.in = in; |
351 | mtpar.out = tgpar.out = out; | |
916a917d | 352 | mtpar.family = tgpar.family = NFPROTO_IPV4; |
a5e78820 | 353 | mtpar.hooknum = tgpar.hooknum = hook; |
1da177e4 | 354 | |
1da177e4 | 355 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
942e4a2b SH |
356 | xt_info_rdlock_bh(); |
357 | private = table->private; | |
f3c5c1bf JE |
358 | cpu = smp_processor_id(); |
359 | table_base = private->entries[cpu]; | |
360 | jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; | |
361 | stackptr = &private->stackptr[cpu]; | |
362 | origptr = *stackptr; | |
78454473 | 363 | |
2e4e6a17 | 364 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 365 | |
cecc74de | 366 | pr_debug("Entering %s(hook %u); sp at %u (UF %p)\n", |
f3c5c1bf JE |
367 | table->name, hook, origptr, |
368 | get_entry(table_base, private->underflow[hook])); | |
1da177e4 LT |
369 | |
370 | do { | |
d5d1baa1 | 371 | const struct ipt_entry_target *t; |
dcea992a | 372 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 373 | |
1da177e4 | 374 | IP_NF_ASSERT(e); |
a1ff4ac8 | 375 | if (!ip_packet_match(ip, indev, outdev, |
dcea992a JE |
376 | &e->ip, mtpar.fragoff)) { |
377 | no_match: | |
a1ff4ac8 JE |
378 | e = ipt_next_entry(e); |
379 | continue; | |
380 | } | |
1da177e4 | 381 | |
dcea992a JE |
382 | xt_ematch_foreach(ematch, e) |
383 | if (do_match(ematch, skb, &mtpar) != 0) | |
384 | goto no_match; | |
385 | ||
a1ff4ac8 | 386 | ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1); |
1da177e4 | 387 | |
a1ff4ac8 JE |
388 | t = ipt_get_target(e); |
389 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
390 | |
391 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
392 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
a1ff4ac8 JE |
393 | /* The packet is traced: log it */ |
394 | if (unlikely(skb->nf_trace)) | |
395 | trace_packet(skb, hook, in, out, | |
396 | table->name, private, e); | |
ba9dda3a | 397 | #endif |
a1ff4ac8 JE |
398 | /* Standard target? */ |
399 | if (!t->u.kernel.target->target) { | |
400 | int v; | |
401 | ||
402 | v = ((struct ipt_standard_target *)t)->verdict; | |
403 | if (v < 0) { | |
404 | /* Pop from stack? */ | |
405 | if (v != IPT_RETURN) { | |
406 | verdict = (unsigned)(-v) - 1; | |
407 | break; | |
1da177e4 | 408 | } |
f3c5c1bf JE |
409 | if (*stackptr == 0) { |
410 | e = get_entry(table_base, | |
411 | private->underflow[hook]); | |
cecc74de | 412 | pr_debug("Underflow (this is normal) " |
f3c5c1bf JE |
413 | "to %p\n", e); |
414 | } else { | |
415 | e = jumpstack[--*stackptr]; | |
cecc74de | 416 | pr_debug("Pulled %p out from pos %u\n", |
f3c5c1bf JE |
417 | e, *stackptr); |
418 | e = ipt_next_entry(e); | |
419 | } | |
a1ff4ac8 JE |
420 | continue; |
421 | } | |
3666ed1c JP |
422 | if (table_base + v != ipt_next_entry(e) && |
423 | !(e->ip.flags & IPT_F_GOTO)) { | |
f3c5c1bf JE |
424 | if (*stackptr >= private->stacksize) { |
425 | verdict = NF_DROP; | |
426 | break; | |
427 | } | |
428 | jumpstack[(*stackptr)++] = e; | |
cecc74de | 429 | pr_debug("Pushed %p into pos %u\n", |
f3c5c1bf | 430 | e, *stackptr - 1); |
a1ff4ac8 | 431 | } |
1da177e4 | 432 | |
a1ff4ac8 | 433 | e = get_entry(table_base, v); |
7a6b1c46 JE |
434 | continue; |
435 | } | |
436 | ||
7a6b1c46 JE |
437 | tgpar.target = t->u.kernel.target; |
438 | tgpar.targinfo = t->data; | |
bb70dfa5 JE |
439 | |
440 | ||
7a6b1c46 | 441 | verdict = t->u.kernel.target->target(skb, &tgpar); |
7a6b1c46 JE |
442 | /* Target might have changed stuff. */ |
443 | ip = ip_hdr(skb); | |
7a6b1c46 JE |
444 | if (verdict == IPT_CONTINUE) |
445 | e = ipt_next_entry(e); | |
446 | else | |
447 | /* Verdict */ | |
448 | break; | |
1da177e4 | 449 | } while (!hotdrop); |
942e4a2b | 450 | xt_info_rdunlock_bh(); |
cecc74de | 451 | pr_debug("Exiting %s; resetting sp from %u to %u\n", |
f3c5c1bf JE |
452 | __func__, *stackptr, origptr); |
453 | *stackptr = origptr; | |
1da177e4 LT |
454 | #ifdef DEBUG_ALLOW_ALL |
455 | return NF_ACCEPT; | |
456 | #else | |
457 | if (hotdrop) | |
458 | return NF_DROP; | |
459 | else return verdict; | |
460 | #endif | |
461 | } | |
462 | ||
1da177e4 LT |
463 | /* Figures out from what hook each rule can be called: returns 0 if |
464 | there are loops. Puts hook bitmask in comefrom. */ | |
465 | static int | |
d5d1baa1 | 466 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 467 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
468 | { |
469 | unsigned int hook; | |
470 | ||
471 | /* No recursion; use packet counter to save back ptrs (reset | |
472 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 473 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 474 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 475 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
476 | |
477 | if (!(valid_hooks & (1 << hook))) | |
478 | continue; | |
479 | ||
480 | /* Set initial back pointer. */ | |
481 | e->counters.pcnt = pos; | |
482 | ||
483 | for (;;) { | |
d5d1baa1 JE |
484 | const struct ipt_standard_target *t |
485 | = (void *)ipt_get_target_c(e); | |
e1b4b9f3 | 486 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 487 | |
6e23ae2a | 488 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
489 | printk("iptables: loop hook %u pos %u %08X.\n", |
490 | hook, pos, e->comefrom); | |
491 | return 0; | |
492 | } | |
9c547959 | 493 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
494 | |
495 | /* Unconditional return/END. */ | |
3666ed1c JP |
496 | if ((e->target_offset == sizeof(struct ipt_entry) && |
497 | (strcmp(t->target.u.user.name, | |
498 | IPT_STANDARD_TARGET) == 0) && | |
499 | t->verdict < 0 && unconditional(&e->ip)) || | |
500 | visited) { | |
1da177e4 LT |
501 | unsigned int oldpos, size; |
502 | ||
1f9352ae PM |
503 | if ((strcmp(t->target.u.user.name, |
504 | IPT_STANDARD_TARGET) == 0) && | |
505 | t->verdict < -NF_MAX_VERDICT - 1) { | |
74c9c0c1 DM |
506 | duprintf("mark_source_chains: bad " |
507 | "negative verdict (%i)\n", | |
508 | t->verdict); | |
509 | return 0; | |
510 | } | |
511 | ||
1da177e4 LT |
512 | /* Return: backtrack through the last |
513 | big jump. */ | |
514 | do { | |
6e23ae2a | 515 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
516 | #ifdef DEBUG_IP_FIREWALL_USER |
517 | if (e->comefrom | |
6e23ae2a | 518 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
519 | duprintf("Back unset " |
520 | "on hook %u " | |
521 | "rule %u\n", | |
522 | hook, pos); | |
523 | } | |
524 | #endif | |
525 | oldpos = pos; | |
526 | pos = e->counters.pcnt; | |
527 | e->counters.pcnt = 0; | |
528 | ||
529 | /* We're at the start. */ | |
530 | if (pos == oldpos) | |
531 | goto next; | |
532 | ||
533 | e = (struct ipt_entry *) | |
31836064 | 534 | (entry0 + pos); |
1da177e4 LT |
535 | } while (oldpos == pos + e->next_offset); |
536 | ||
537 | /* Move along one */ | |
538 | size = e->next_offset; | |
539 | e = (struct ipt_entry *) | |
31836064 | 540 | (entry0 + pos + size); |
1da177e4 LT |
541 | e->counters.pcnt = pos; |
542 | pos += size; | |
543 | } else { | |
544 | int newpos = t->verdict; | |
545 | ||
546 | if (strcmp(t->target.u.user.name, | |
3666ed1c JP |
547 | IPT_STANDARD_TARGET) == 0 && |
548 | newpos >= 0) { | |
74c9c0c1 DM |
549 | if (newpos > newinfo->size - |
550 | sizeof(struct ipt_entry)) { | |
551 | duprintf("mark_source_chains: " | |
552 | "bad verdict (%i)\n", | |
553 | newpos); | |
554 | return 0; | |
555 | } | |
1da177e4 LT |
556 | /* This a jump; chase it. */ |
557 | duprintf("Jump rule %u -> %u\n", | |
558 | pos, newpos); | |
559 | } else { | |
560 | /* ... this is a fallthru */ | |
561 | newpos = pos + e->next_offset; | |
562 | } | |
563 | e = (struct ipt_entry *) | |
31836064 | 564 | (entry0 + newpos); |
1da177e4 LT |
565 | e->counters.pcnt = pos; |
566 | pos = newpos; | |
567 | } | |
568 | } | |
569 | next: | |
570 | duprintf("Finished chain %u\n", hook); | |
571 | } | |
572 | return 1; | |
573 | } | |
574 | ||
6bdb331b | 575 | static void cleanup_match(struct ipt_entry_match *m, struct net *net) |
1da177e4 | 576 | { |
6be3d859 JE |
577 | struct xt_mtdtor_param par; |
578 | ||
f54e9367 | 579 | par.net = net; |
6be3d859 JE |
580 | par.match = m->u.kernel.match; |
581 | par.matchinfo = m->data; | |
916a917d | 582 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
583 | if (par.match->destroy != NULL) |
584 | par.match->destroy(&par); | |
585 | module_put(par.match->me); | |
1da177e4 LT |
586 | } |
587 | ||
022748a9 | 588 | static int |
d5d1baa1 | 589 | check_entry(const struct ipt_entry *e, const char *name) |
a96be246 | 590 | { |
d5d1baa1 | 591 | const struct ipt_entry_target *t; |
a96be246 DM |
592 | |
593 | if (!ip_checkentry(&e->ip)) { | |
b5cad0df | 594 | duprintf("ip check failed %p %s.\n", e, par->match->name); |
a96be246 DM |
595 | return -EINVAL; |
596 | } | |
597 | ||
9c547959 PM |
598 | if (e->target_offset + sizeof(struct ipt_entry_target) > |
599 | e->next_offset) | |
a96be246 DM |
600 | return -EINVAL; |
601 | ||
d5d1baa1 | 602 | t = ipt_get_target_c(e); |
a96be246 DM |
603 | if (e->target_offset + t->u.target_size > e->next_offset) |
604 | return -EINVAL; | |
605 | ||
606 | return 0; | |
607 | } | |
608 | ||
022748a9 | 609 | static int |
6bdb331b | 610 | check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par) |
a96be246 | 611 | { |
9b4fce7a | 612 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 DM |
613 | int ret; |
614 | ||
9b4fce7a JE |
615 | par->match = m->u.kernel.match; |
616 | par->matchinfo = m->data; | |
617 | ||
916a917d | 618 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 619 | ip->proto, ip->invflags & IPT_INV_PROTO); |
367c6790 | 620 | if (ret < 0) { |
b5cad0df | 621 | duprintf("check failed for `%s'.\n", par->match->name); |
367c6790 | 622 | return ret; |
a96be246 | 623 | } |
367c6790 | 624 | return 0; |
a96be246 DM |
625 | } |
626 | ||
022748a9 | 627 | static int |
6bdb331b | 628 | find_check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 629 | { |
6709dbbb | 630 | struct xt_match *match; |
3cdc7c95 | 631 | int ret; |
1da177e4 | 632 | |
fd0ec0e6 JE |
633 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
634 | m->u.user.revision); | |
635 | if (IS_ERR(match)) { | |
a96be246 | 636 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 637 | return PTR_ERR(match); |
1da177e4 LT |
638 | } |
639 | m->u.kernel.match = match; | |
640 | ||
6bdb331b | 641 | ret = check_match(m, par); |
3cdc7c95 PM |
642 | if (ret) |
643 | goto err; | |
644 | ||
1da177e4 | 645 | return 0; |
3cdc7c95 PM |
646 | err: |
647 | module_put(m->u.kernel.match->me); | |
648 | return ret; | |
1da177e4 LT |
649 | } |
650 | ||
add67461 | 651 | static int check_target(struct ipt_entry *e, struct net *net, const char *name) |
a96be246 | 652 | { |
af5d6dc2 JE |
653 | struct ipt_entry_target *t = ipt_get_target(e); |
654 | struct xt_tgchk_param par = { | |
add67461 | 655 | .net = net, |
af5d6dc2 JE |
656 | .table = name, |
657 | .entryinfo = e, | |
658 | .target = t->u.kernel.target, | |
659 | .targinfo = t->data, | |
660 | .hook_mask = e->comefrom, | |
916a917d | 661 | .family = NFPROTO_IPV4, |
af5d6dc2 | 662 | }; |
e905a9ed | 663 | int ret; |
a96be246 | 664 | |
916a917d | 665 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 666 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
367c6790 | 667 | if (ret < 0) { |
ff67e4e4 | 668 | duprintf("check failed for `%s'.\n", |
a96be246 | 669 | t->u.kernel.target->name); |
367c6790 | 670 | return ret; |
a96be246 | 671 | } |
367c6790 | 672 | return 0; |
a96be246 | 673 | } |
1da177e4 | 674 | |
022748a9 | 675 | static int |
a83d8e8d | 676 | find_check_entry(struct ipt_entry *e, struct net *net, const char *name, |
0559518b | 677 | unsigned int size) |
1da177e4 LT |
678 | { |
679 | struct ipt_entry_target *t; | |
6709dbbb | 680 | struct xt_target *target; |
1da177e4 LT |
681 | int ret; |
682 | unsigned int j; | |
9b4fce7a | 683 | struct xt_mtchk_param mtpar; |
dcea992a | 684 | struct xt_entry_match *ematch; |
1da177e4 | 685 | |
a96be246 DM |
686 | ret = check_entry(e, name); |
687 | if (ret) | |
688 | return ret; | |
590bdf7f | 689 | |
1da177e4 | 690 | j = 0; |
a83d8e8d | 691 | mtpar.net = net; |
9b4fce7a JE |
692 | mtpar.table = name; |
693 | mtpar.entryinfo = &e->ip; | |
694 | mtpar.hook_mask = e->comefrom; | |
916a917d | 695 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 696 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 697 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 698 | if (ret != 0) |
6bdb331b JE |
699 | goto cleanup_matches; |
700 | ++j; | |
dcea992a | 701 | } |
1da177e4 LT |
702 | |
703 | t = ipt_get_target(e); | |
d2a7b6ba JE |
704 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
705 | t->u.user.revision); | |
706 | if (IS_ERR(target)) { | |
a96be246 | 707 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 708 | ret = PTR_ERR(target); |
1da177e4 LT |
709 | goto cleanup_matches; |
710 | } | |
711 | t->u.kernel.target = target; | |
712 | ||
add67461 | 713 | ret = check_target(e, net, name); |
3cdc7c95 PM |
714 | if (ret) |
715 | goto err; | |
1da177e4 | 716 | return 0; |
3cdc7c95 PM |
717 | err: |
718 | module_put(t->u.kernel.target->me); | |
1da177e4 | 719 | cleanup_matches: |
6bdb331b JE |
720 | xt_ematch_foreach(ematch, e) { |
721 | if (j-- == 0) | |
dcea992a | 722 | break; |
6bdb331b JE |
723 | cleanup_match(ematch, net); |
724 | } | |
1da177e4 LT |
725 | return ret; |
726 | } | |
727 | ||
d5d1baa1 | 728 | static bool check_underflow(const struct ipt_entry *e) |
e2fe35c1 JE |
729 | { |
730 | const struct ipt_entry_target *t; | |
731 | unsigned int verdict; | |
732 | ||
733 | if (!unconditional(&e->ip)) | |
734 | return false; | |
d5d1baa1 | 735 | t = ipt_get_target_c(e); |
e2fe35c1 JE |
736 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
737 | return false; | |
738 | verdict = ((struct ipt_standard_target *)t)->verdict; | |
739 | verdict = -verdict - 1; | |
740 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
741 | } | |
742 | ||
022748a9 | 743 | static int |
1da177e4 | 744 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 745 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
746 | const unsigned char *base, |
747 | const unsigned char *limit, | |
1da177e4 LT |
748 | const unsigned int *hook_entries, |
749 | const unsigned int *underflows, | |
0559518b | 750 | unsigned int valid_hooks) |
1da177e4 LT |
751 | { |
752 | unsigned int h; | |
753 | ||
3666ed1c JP |
754 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 || |
755 | (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { | |
1da177e4 LT |
756 | duprintf("Bad offset %p\n", e); |
757 | return -EINVAL; | |
758 | } | |
759 | ||
760 | if (e->next_offset | |
761 | < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) { | |
762 | duprintf("checking: element %p size %u\n", | |
763 | e, e->next_offset); | |
764 | return -EINVAL; | |
765 | } | |
766 | ||
767 | /* Check hooks & underflows */ | |
6e23ae2a | 768 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
769 | if (!(valid_hooks & (1 << h))) |
770 | continue; | |
1da177e4 LT |
771 | if ((unsigned char *)e - base == hook_entries[h]) |
772 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 773 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
774 | if (!check_underflow(e)) { |
775 | pr_err("Underflows must be unconditional and " | |
776 | "use the STANDARD target with " | |
777 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
778 | return -EINVAL; |
779 | } | |
1da177e4 | 780 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 781 | } |
1da177e4 LT |
782 | } |
783 | ||
1da177e4 | 784 | /* Clear counters and comefrom */ |
2e4e6a17 | 785 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 786 | e->comefrom = 0; |
1da177e4 LT |
787 | return 0; |
788 | } | |
789 | ||
0559518b JE |
790 | static void |
791 | cleanup_entry(struct ipt_entry *e, struct net *net) | |
1da177e4 | 792 | { |
a2df1648 | 793 | struct xt_tgdtor_param par; |
1da177e4 | 794 | struct ipt_entry_target *t; |
dcea992a | 795 | struct xt_entry_match *ematch; |
1da177e4 | 796 | |
1da177e4 | 797 | /* Cleanup all matches */ |
dcea992a | 798 | xt_ematch_foreach(ematch, e) |
6bdb331b | 799 | cleanup_match(ematch, net); |
1da177e4 | 800 | t = ipt_get_target(e); |
a2df1648 | 801 | |
add67461 | 802 | par.net = net; |
a2df1648 JE |
803 | par.target = t->u.kernel.target; |
804 | par.targinfo = t->data; | |
916a917d | 805 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
806 | if (par.target->destroy != NULL) |
807 | par.target->destroy(&par); | |
808 | module_put(par.target->me); | |
1da177e4 LT |
809 | } |
810 | ||
811 | /* Checks and translates the user-supplied table segment (held in | |
812 | newinfo) */ | |
813 | static int | |
0f234214 JE |
814 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
815 | const struct ipt_replace *repl) | |
1da177e4 | 816 | { |
72b2b1dd | 817 | struct ipt_entry *iter; |
1da177e4 | 818 | unsigned int i; |
72b2b1dd | 819 | int ret = 0; |
1da177e4 | 820 | |
0f234214 JE |
821 | newinfo->size = repl->size; |
822 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
823 | |
824 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 825 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
826 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
827 | newinfo->underflow[i] = 0xFFFFFFFF; | |
828 | } | |
829 | ||
830 | duprintf("translate_table: size %u\n", newinfo->size); | |
831 | i = 0; | |
832 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
833 | xt_entry_foreach(iter, entry0, newinfo->size) { |
834 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
835 | entry0 + repl->size, |
836 | repl->hook_entry, | |
837 | repl->underflow, | |
838 | repl->valid_hooks); | |
72b2b1dd | 839 | if (ret != 0) |
0559518b JE |
840 | return ret; |
841 | ++i; | |
f3c5c1bf JE |
842 | if (strcmp(ipt_get_target(iter)->u.user.name, |
843 | XT_ERROR_TARGET) == 0) | |
844 | ++newinfo->stacksize; | |
72b2b1dd | 845 | } |
1da177e4 | 846 | |
0f234214 | 847 | if (i != repl->num_entries) { |
1da177e4 | 848 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 849 | i, repl->num_entries); |
1da177e4 LT |
850 | return -EINVAL; |
851 | } | |
852 | ||
853 | /* Check hooks all assigned */ | |
6e23ae2a | 854 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 855 | /* Only hooks which are valid */ |
0f234214 | 856 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
857 | continue; |
858 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
859 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 860 | i, repl->hook_entry[i]); |
1da177e4 LT |
861 | return -EINVAL; |
862 | } | |
863 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
864 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 865 | i, repl->underflow[i]); |
1da177e4 LT |
866 | return -EINVAL; |
867 | } | |
868 | } | |
869 | ||
0f234214 | 870 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
871 | return -ELOOP; |
872 | ||
1da177e4 LT |
873 | /* Finally, each sanity check must pass */ |
874 | i = 0; | |
72b2b1dd | 875 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 876 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
877 | if (ret != 0) |
878 | break; | |
0559518b | 879 | ++i; |
72b2b1dd | 880 | } |
1da177e4 | 881 | |
74c9c0c1 | 882 | if (ret != 0) { |
0559518b JE |
883 | xt_entry_foreach(iter, entry0, newinfo->size) { |
884 | if (i-- == 0) | |
72b2b1dd | 885 | break; |
0559518b JE |
886 | cleanup_entry(iter, net); |
887 | } | |
74c9c0c1 DM |
888 | return ret; |
889 | } | |
1da177e4 LT |
890 | |
891 | /* And one copy for every other CPU */ | |
6f912042 | 892 | for_each_possible_cpu(i) { |
31836064 ED |
893 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
894 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
895 | } |
896 | ||
897 | return ret; | |
898 | } | |
899 | ||
1da177e4 | 900 | static void |
2e4e6a17 HW |
901 | get_counters(const struct xt_table_info *t, |
902 | struct xt_counters counters[]) | |
1da177e4 | 903 | { |
72b2b1dd | 904 | struct ipt_entry *iter; |
1da177e4 LT |
905 | unsigned int cpu; |
906 | unsigned int i; | |
31836064 ED |
907 | unsigned int curcpu; |
908 | ||
909 | /* Instead of clearing (by a previous call to memset()) | |
910 | * the counters and using adds, we set the counters | |
942e4a2b SH |
911 | * with data used by 'current' CPU. |
912 | * | |
913 | * Bottom half has to be disabled to prevent deadlock | |
914 | * if new softirq were to run and call ipt_do_table | |
31836064 | 915 | */ |
942e4a2b SH |
916 | local_bh_disable(); |
917 | curcpu = smp_processor_id(); | |
31836064 ED |
918 | |
919 | i = 0; | |
0559518b JE |
920 | xt_entry_foreach(iter, t->entries[curcpu], t->size) { |
921 | SET_COUNTER(counters[i], iter->counters.bcnt, | |
6b4ff2d7 | 922 | iter->counters.pcnt); |
0559518b JE |
923 | ++i; |
924 | } | |
1da177e4 | 925 | |
6f912042 | 926 | for_each_possible_cpu(cpu) { |
31836064 ED |
927 | if (cpu == curcpu) |
928 | continue; | |
1da177e4 | 929 | i = 0; |
942e4a2b | 930 | xt_info_wrlock(cpu); |
0559518b JE |
931 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
932 | ADD_COUNTER(counters[i], iter->counters.bcnt, | |
6b4ff2d7 | 933 | iter->counters.pcnt); |
0559518b JE |
934 | ++i; /* macro does multi eval of i */ |
935 | } | |
942e4a2b | 936 | xt_info_wrunlock(cpu); |
1da177e4 | 937 | } |
78454473 SH |
938 | local_bh_enable(); |
939 | } | |
940 | ||
d5d1baa1 | 941 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 942 | { |
2722971c | 943 | unsigned int countersize; |
2e4e6a17 | 944 | struct xt_counters *counters; |
d5d1baa1 | 945 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
946 | |
947 | /* We need atomic snapshot of counters: rest doesn't change | |
948 | (other than comefrom, which userspace doesn't care | |
949 | about). */ | |
2e4e6a17 | 950 | countersize = sizeof(struct xt_counters) * private->number; |
31836064 | 951 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
952 | |
953 | if (counters == NULL) | |
942e4a2b | 954 | return ERR_PTR(-ENOMEM); |
78454473 | 955 | |
942e4a2b | 956 | get_counters(private, counters); |
1da177e4 | 957 | |
2722971c DM |
958 | return counters; |
959 | } | |
960 | ||
961 | static int | |
962 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 963 | const struct xt_table *table, |
2722971c DM |
964 | void __user *userptr) |
965 | { | |
966 | unsigned int off, num; | |
d5d1baa1 | 967 | const struct ipt_entry *e; |
2722971c | 968 | struct xt_counters *counters; |
5452e425 | 969 | const struct xt_table_info *private = table->private; |
2722971c | 970 | int ret = 0; |
5452e425 | 971 | const void *loc_cpu_entry; |
2722971c DM |
972 | |
973 | counters = alloc_counters(table); | |
974 | if (IS_ERR(counters)) | |
975 | return PTR_ERR(counters); | |
976 | ||
31836064 ED |
977 | /* choose the copy that is on our node/cpu, ... |
978 | * This choice is lazy (because current thread is | |
979 | * allowed to migrate to another cpu) | |
980 | */ | |
2e4e6a17 | 981 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 982 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
983 | ret = -EFAULT; |
984 | goto free_counters; | |
985 | } | |
986 | ||
987 | /* FIXME: use iterator macros --RR */ | |
988 | /* ... then go back and fix counters and names */ | |
989 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
990 | unsigned int i; | |
5452e425 JE |
991 | const struct ipt_entry_match *m; |
992 | const struct ipt_entry_target *t; | |
1da177e4 | 993 | |
31836064 | 994 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
995 | if (copy_to_user(userptr + off |
996 | + offsetof(struct ipt_entry, counters), | |
997 | &counters[num], | |
998 | sizeof(counters[num])) != 0) { | |
999 | ret = -EFAULT; | |
1000 | goto free_counters; | |
1001 | } | |
1002 | ||
1003 | for (i = sizeof(struct ipt_entry); | |
1004 | i < e->target_offset; | |
1005 | i += m->u.match_size) { | |
1006 | m = (void *)e + i; | |
1007 | ||
1008 | if (copy_to_user(userptr + off + i | |
1009 | + offsetof(struct ipt_entry_match, | |
1010 | u.user.name), | |
1011 | m->u.kernel.match->name, | |
1012 | strlen(m->u.kernel.match->name)+1) | |
1013 | != 0) { | |
1014 | ret = -EFAULT; | |
1015 | goto free_counters; | |
1016 | } | |
1017 | } | |
1018 | ||
d5d1baa1 | 1019 | t = ipt_get_target_c(e); |
1da177e4 LT |
1020 | if (copy_to_user(userptr + off + e->target_offset |
1021 | + offsetof(struct ipt_entry_target, | |
1022 | u.user.name), | |
1023 | t->u.kernel.target->name, | |
1024 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1025 | ret = -EFAULT; | |
1026 | goto free_counters; | |
1027 | } | |
1028 | } | |
1029 | ||
1030 | free_counters: | |
1031 | vfree(counters); | |
1032 | return ret; | |
1033 | } | |
1034 | ||
2722971c | 1035 | #ifdef CONFIG_COMPAT |
739674fb | 1036 | static void compat_standard_from_user(void *dst, const void *src) |
2722971c | 1037 | { |
9fa492cd | 1038 | int v = *(compat_int_t *)src; |
2722971c | 1039 | |
9fa492cd | 1040 | if (v > 0) |
b386d9f5 | 1041 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1042 | memcpy(dst, &v, sizeof(v)); |
1043 | } | |
46c5ea3c | 1044 | |
739674fb | 1045 | static int compat_standard_to_user(void __user *dst, const void *src) |
2722971c | 1046 | { |
9fa492cd | 1047 | compat_int_t cv = *(int *)src; |
2722971c | 1048 | |
9fa492cd | 1049 | if (cv > 0) |
b386d9f5 | 1050 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1051 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1052 | } |
1053 | ||
d5d1baa1 | 1054 | static int compat_calc_entry(const struct ipt_entry *e, |
4b478248 | 1055 | const struct xt_table_info *info, |
d5d1baa1 | 1056 | const void *base, struct xt_table_info *newinfo) |
2722971c | 1057 | { |
dcea992a | 1058 | const struct xt_entry_match *ematch; |
d5d1baa1 | 1059 | const struct ipt_entry_target *t; |
e5b5ef7d | 1060 | unsigned int entry_offset; |
2722971c DM |
1061 | int off, i, ret; |
1062 | ||
30c08c41 | 1063 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c | 1064 | entry_offset = (void *)e - base; |
dcea992a | 1065 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1066 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1067 | t = ipt_get_target_c(e); |
9fa492cd | 1068 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1069 | newinfo->size -= off; |
b386d9f5 | 1070 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1071 | if (ret) |
1072 | return ret; | |
1073 | ||
6e23ae2a | 1074 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1075 | if (info->hook_entry[i] && |
1076 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1077 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1078 | if (info->underflow[i] && |
1079 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1080 | newinfo->underflow[i] -= off; |
1081 | } | |
1082 | return 0; | |
1083 | } | |
1084 | ||
259d4e41 | 1085 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1086 | struct xt_table_info *newinfo) |
2722971c | 1087 | { |
72b2b1dd | 1088 | struct ipt_entry *iter; |
2722971c | 1089 | void *loc_cpu_entry; |
0559518b | 1090 | int ret; |
2722971c DM |
1091 | |
1092 | if (!newinfo || !info) | |
1093 | return -EINVAL; | |
1094 | ||
259d4e41 ED |
1095 | /* we dont care about newinfo->entries[] */ |
1096 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1097 | newinfo->initial_entries = 0; | |
2722971c | 1098 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
72b2b1dd JE |
1099 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1100 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1101 | if (ret != 0) | |
0559518b | 1102 | return ret; |
72b2b1dd | 1103 | } |
0559518b | 1104 | return 0; |
2722971c DM |
1105 | } |
1106 | #endif | |
1107 | ||
d5d1baa1 JE |
1108 | static int get_info(struct net *net, void __user *user, |
1109 | const int *len, int compat) | |
2722971c DM |
1110 | { |
1111 | char name[IPT_TABLE_MAXNAMELEN]; | |
e60a13e0 | 1112 | struct xt_table *t; |
2722971c DM |
1113 | int ret; |
1114 | ||
1115 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1116 | duprintf("length %u != %zu\n", *len, |
1117 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1118 | return -EINVAL; |
1119 | } | |
1120 | ||
1121 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1122 | return -EFAULT; | |
1123 | ||
1124 | name[IPT_TABLE_MAXNAMELEN-1] = '\0'; | |
1125 | #ifdef CONFIG_COMPAT | |
1126 | if (compat) | |
1127 | xt_compat_lock(AF_INET); | |
1128 | #endif | |
34bd137b | 1129 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1130 | "iptable_%s", name); |
2722971c DM |
1131 | if (t && !IS_ERR(t)) { |
1132 | struct ipt_getinfo info; | |
5452e425 | 1133 | const struct xt_table_info *private = t->private; |
2722971c | 1134 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1135 | struct xt_table_info tmp; |
1136 | ||
2722971c | 1137 | if (compat) { |
2722971c | 1138 | ret = compat_table_info(private, &tmp); |
b386d9f5 | 1139 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1140 | private = &tmp; |
2722971c DM |
1141 | } |
1142 | #endif | |
1143 | info.valid_hooks = t->valid_hooks; | |
1144 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1145 | sizeof(info.hook_entry)); |
2722971c | 1146 | memcpy(info.underflow, private->underflow, |
4b478248 | 1147 | sizeof(info.underflow)); |
2722971c DM |
1148 | info.num_entries = private->number; |
1149 | info.size = private->size; | |
1150 | strcpy(info.name, name); | |
1151 | ||
1152 | if (copy_to_user(user, &info, *len) != 0) | |
1153 | ret = -EFAULT; | |
1154 | else | |
1155 | ret = 0; | |
1156 | ||
1157 | xt_table_unlock(t); | |
1158 | module_put(t->me); | |
1159 | } else | |
1160 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1161 | #ifdef CONFIG_COMPAT | |
1162 | if (compat) | |
1163 | xt_compat_unlock(AF_INET); | |
1164 | #endif | |
1165 | return ret; | |
1166 | } | |
1167 | ||
1168 | static int | |
d5d1baa1 JE |
1169 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
1170 | const int *len) | |
2722971c DM |
1171 | { |
1172 | int ret; | |
1173 | struct ipt_get_entries get; | |
e60a13e0 | 1174 | struct xt_table *t; |
2722971c DM |
1175 | |
1176 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1177 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1178 | return -EINVAL; |
1179 | } | |
1180 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1181 | return -EFAULT; | |
1182 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1183 | duprintf("get_entries: %u != %zu\n", |
1184 | *len, sizeof(get) + get.size); | |
2722971c DM |
1185 | return -EINVAL; |
1186 | } | |
1187 | ||
34bd137b | 1188 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1189 | if (t && !IS_ERR(t)) { |
5452e425 | 1190 | const struct xt_table_info *private = t->private; |
9c547959 | 1191 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1192 | if (get.size == private->size) |
1193 | ret = copy_entries_to_user(private->size, | |
1194 | t, uptr->entrytable); | |
1195 | else { | |
1196 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1197 | private->size, get.size); |
544473c1 | 1198 | ret = -EAGAIN; |
2722971c DM |
1199 | } |
1200 | module_put(t->me); | |
1201 | xt_table_unlock(t); | |
1202 | } else | |
1203 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1204 | ||
1205 | return ret; | |
1206 | } | |
1207 | ||
1208 | static int | |
34bd137b | 1209 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1210 | struct xt_table_info *newinfo, unsigned int num_counters, |
1211 | void __user *counters_ptr) | |
2722971c DM |
1212 | { |
1213 | int ret; | |
e60a13e0 | 1214 | struct xt_table *t; |
2722971c DM |
1215 | struct xt_table_info *oldinfo; |
1216 | struct xt_counters *counters; | |
1217 | void *loc_cpu_old_entry; | |
72b2b1dd | 1218 | struct ipt_entry *iter; |
2722971c DM |
1219 | |
1220 | ret = 0; | |
1221 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); | |
1222 | if (!counters) { | |
1223 | ret = -ENOMEM; | |
1224 | goto out; | |
1225 | } | |
1226 | ||
34bd137b | 1227 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c DM |
1228 | "iptable_%s", name); |
1229 | if (!t || IS_ERR(t)) { | |
1230 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1231 | goto free_newinfo_counters_untrans; | |
1232 | } | |
1233 | ||
1234 | /* You lied! */ | |
1235 | if (valid_hooks != t->valid_hooks) { | |
1236 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1237 | valid_hooks, t->valid_hooks); | |
1238 | ret = -EINVAL; | |
1239 | goto put_module; | |
1240 | } | |
1241 | ||
1242 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1243 | if (!oldinfo) | |
1244 | goto put_module; | |
1245 | ||
1246 | /* Update module usage count based on number of rules */ | |
1247 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1248 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1249 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1250 | (newinfo->number <= oldinfo->initial_entries)) | |
1251 | module_put(t->me); | |
1252 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1253 | (newinfo->number <= oldinfo->initial_entries)) | |
1254 | module_put(t->me); | |
1255 | ||
942e4a2b | 1256 | /* Get the old counters, and synchronize with replace */ |
2722971c | 1257 | get_counters(oldinfo, counters); |
942e4a2b | 1258 | |
2722971c DM |
1259 | /* Decrease module usage counts and free resource */ |
1260 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
72b2b1dd | 1261 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1262 | cleanup_entry(iter, net); |
72b2b1dd | 1263 | |
2722971c DM |
1264 | xt_free_table_info(oldinfo); |
1265 | if (copy_to_user(counters_ptr, counters, | |
1266 | sizeof(struct xt_counters) * num_counters) != 0) | |
1267 | ret = -EFAULT; | |
1268 | vfree(counters); | |
1269 | xt_table_unlock(t); | |
1270 | return ret; | |
1271 | ||
1272 | put_module: | |
1273 | module_put(t->me); | |
1274 | xt_table_unlock(t); | |
1275 | free_newinfo_counters_untrans: | |
1276 | vfree(counters); | |
1277 | out: | |
1278 | return ret; | |
1279 | } | |
1280 | ||
1281 | static int | |
d5d1baa1 | 1282 | do_replace(struct net *net, const void __user *user, unsigned int len) |
2722971c DM |
1283 | { |
1284 | int ret; | |
1285 | struct ipt_replace tmp; | |
1286 | struct xt_table_info *newinfo; | |
1287 | void *loc_cpu_entry; | |
72b2b1dd | 1288 | struct ipt_entry *iter; |
2722971c DM |
1289 | |
1290 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1291 | return -EFAULT; | |
1292 | ||
2722971c | 1293 | /* overflow check */ |
2722971c DM |
1294 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1295 | return -ENOMEM; | |
1296 | ||
1297 | newinfo = xt_alloc_table_info(tmp.size); | |
1298 | if (!newinfo) | |
1299 | return -ENOMEM; | |
1300 | ||
9c547959 | 1301 | /* choose the copy that is on our node/cpu */ |
2722971c DM |
1302 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1303 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1304 | tmp.size) != 0) { | |
1305 | ret = -EFAULT; | |
1306 | goto free_newinfo; | |
1307 | } | |
1308 | ||
0f234214 | 1309 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
2722971c DM |
1310 | if (ret != 0) |
1311 | goto free_newinfo; | |
1312 | ||
ff67e4e4 | 1313 | duprintf("Translated table\n"); |
2722971c | 1314 | |
34bd137b | 1315 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1316 | tmp.num_counters, tmp.counters); |
2722971c DM |
1317 | if (ret) |
1318 | goto free_newinfo_untrans; | |
1319 | return 0; | |
1320 | ||
1321 | free_newinfo_untrans: | |
72b2b1dd | 1322 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1323 | cleanup_entry(iter, net); |
2722971c DM |
1324 | free_newinfo: |
1325 | xt_free_table_info(newinfo); | |
1326 | return ret; | |
1327 | } | |
1328 | ||
2722971c | 1329 | static int |
d5d1baa1 JE |
1330 | do_add_counters(struct net *net, const void __user *user, |
1331 | unsigned int len, int compat) | |
2722971c | 1332 | { |
942e4a2b | 1333 | unsigned int i, curcpu; |
2722971c DM |
1334 | struct xt_counters_info tmp; |
1335 | struct xt_counters *paddc; | |
1336 | unsigned int num_counters; | |
5452e425 | 1337 | const char *name; |
2722971c DM |
1338 | int size; |
1339 | void *ptmp; | |
e60a13e0 | 1340 | struct xt_table *t; |
5452e425 | 1341 | const struct xt_table_info *private; |
2722971c DM |
1342 | int ret = 0; |
1343 | void *loc_cpu_entry; | |
72b2b1dd | 1344 | struct ipt_entry *iter; |
2722971c DM |
1345 | #ifdef CONFIG_COMPAT |
1346 | struct compat_xt_counters_info compat_tmp; | |
1347 | ||
1348 | if (compat) { | |
1349 | ptmp = &compat_tmp; | |
1350 | size = sizeof(struct compat_xt_counters_info); | |
1351 | } else | |
1352 | #endif | |
1353 | { | |
1354 | ptmp = &tmp; | |
1355 | size = sizeof(struct xt_counters_info); | |
1356 | } | |
1357 | ||
1358 | if (copy_from_user(ptmp, user, size) != 0) | |
1359 | return -EFAULT; | |
1360 | ||
1361 | #ifdef CONFIG_COMPAT | |
1362 | if (compat) { | |
1363 | num_counters = compat_tmp.num_counters; | |
1364 | name = compat_tmp.name; | |
1365 | } else | |
1366 | #endif | |
1367 | { | |
1368 | num_counters = tmp.num_counters; | |
1369 | name = tmp.name; | |
1370 | } | |
1371 | ||
1372 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1373 | return -EINVAL; | |
1374 | ||
1375 | paddc = vmalloc_node(len - size, numa_node_id()); | |
1376 | if (!paddc) | |
1377 | return -ENOMEM; | |
1378 | ||
1379 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1380 | ret = -EFAULT; | |
1381 | goto free; | |
1382 | } | |
1383 | ||
34bd137b | 1384 | t = xt_find_table_lock(net, AF_INET, name); |
2722971c DM |
1385 | if (!t || IS_ERR(t)) { |
1386 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1387 | goto free; | |
1388 | } | |
1389 | ||
942e4a2b | 1390 | local_bh_disable(); |
2722971c DM |
1391 | private = t->private; |
1392 | if (private->number != num_counters) { | |
1393 | ret = -EINVAL; | |
1394 | goto unlock_up_free; | |
1395 | } | |
1396 | ||
1397 | i = 0; | |
1398 | /* Choose the copy that is on our node */ | |
942e4a2b SH |
1399 | curcpu = smp_processor_id(); |
1400 | loc_cpu_entry = private->entries[curcpu]; | |
1401 | xt_info_wrlock(curcpu); | |
0559518b JE |
1402 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1403 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1404 | ++i; | |
1405 | } | |
942e4a2b | 1406 | xt_info_wrunlock(curcpu); |
2722971c | 1407 | unlock_up_free: |
942e4a2b | 1408 | local_bh_enable(); |
2722971c DM |
1409 | xt_table_unlock(t); |
1410 | module_put(t->me); | |
1411 | free: | |
1412 | vfree(paddc); | |
1413 | ||
1414 | return ret; | |
1415 | } | |
1416 | ||
1417 | #ifdef CONFIG_COMPAT | |
1418 | struct compat_ipt_replace { | |
1419 | char name[IPT_TABLE_MAXNAMELEN]; | |
1420 | u32 valid_hooks; | |
1421 | u32 num_entries; | |
1422 | u32 size; | |
6e23ae2a PM |
1423 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1424 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c DM |
1425 | u32 num_counters; |
1426 | compat_uptr_t counters; /* struct ipt_counters * */ | |
1427 | struct compat_ipt_entry entries[0]; | |
1428 | }; | |
1429 | ||
a18aa31b PM |
1430 | static int |
1431 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1432 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1433 | unsigned int i) |
2722971c | 1434 | { |
3e597c60 | 1435 | struct ipt_entry_target *t; |
2722971c DM |
1436 | struct compat_ipt_entry __user *ce; |
1437 | u_int16_t target_offset, next_offset; | |
1438 | compat_uint_t origsize; | |
dcea992a JE |
1439 | const struct xt_entry_match *ematch; |
1440 | int ret = 0; | |
2722971c | 1441 | |
2722971c DM |
1442 | origsize = *size; |
1443 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
0559518b JE |
1444 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
1445 | copy_to_user(&ce->counters, &counters[i], | |
1446 | sizeof(counters[i])) != 0) | |
1447 | return -EFAULT; | |
a18aa31b | 1448 | |
2722971c | 1449 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1450 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1451 | ||
dcea992a JE |
1452 | xt_ematch_foreach(ematch, e) { |
1453 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1454 | if (ret != 0) | |
6bdb331b | 1455 | return ret; |
dcea992a | 1456 | } |
2722971c | 1457 | target_offset = e->target_offset - (origsize - *size); |
2722971c | 1458 | t = ipt_get_target(e); |
9fa492cd | 1459 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c | 1460 | if (ret) |
0559518b | 1461 | return ret; |
2722971c | 1462 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1463 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1464 | put_user(next_offset, &ce->next_offset) != 0) | |
1465 | return -EFAULT; | |
2722971c | 1466 | return 0; |
2722971c DM |
1467 | } |
1468 | ||
022748a9 | 1469 | static int |
4c1b52bc | 1470 | compat_find_calc_match(struct ipt_entry_match *m, |
4b478248 PM |
1471 | const char *name, |
1472 | const struct ipt_ip *ip, | |
1473 | unsigned int hookmask, | |
6bdb331b | 1474 | int *size) |
2722971c | 1475 | { |
6709dbbb | 1476 | struct xt_match *match; |
2722971c | 1477 | |
fd0ec0e6 JE |
1478 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
1479 | m->u.user.revision); | |
1480 | if (IS_ERR(match)) { | |
2722971c | 1481 | duprintf("compat_check_calc_match: `%s' not found\n", |
4b478248 | 1482 | m->u.user.name); |
fd0ec0e6 | 1483 | return PTR_ERR(match); |
2722971c DM |
1484 | } |
1485 | m->u.kernel.match = match; | |
9fa492cd | 1486 | *size += xt_compat_match_offset(match); |
4c1b52bc DM |
1487 | return 0; |
1488 | } | |
1489 | ||
0559518b | 1490 | static void compat_release_entry(struct compat_ipt_entry *e) |
4c1b52bc DM |
1491 | { |
1492 | struct ipt_entry_target *t; | |
dcea992a | 1493 | struct xt_entry_match *ematch; |
4c1b52bc | 1494 | |
4c1b52bc | 1495 | /* Cleanup all matches */ |
dcea992a | 1496 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1497 | module_put(ematch->u.kernel.match->me); |
73cd598d | 1498 | t = compat_ipt_get_target(e); |
4c1b52bc | 1499 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1500 | } |
1501 | ||
022748a9 | 1502 | static int |
73cd598d | 1503 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1504 | struct xt_table_info *newinfo, |
1505 | unsigned int *size, | |
d5d1baa1 JE |
1506 | const unsigned char *base, |
1507 | const unsigned char *limit, | |
1508 | const unsigned int *hook_entries, | |
1509 | const unsigned int *underflows, | |
4b478248 | 1510 | const char *name) |
2722971c | 1511 | { |
dcea992a | 1512 | struct xt_entry_match *ematch; |
2722971c | 1513 | struct ipt_entry_target *t; |
6709dbbb | 1514 | struct xt_target *target; |
e5b5ef7d | 1515 | unsigned int entry_offset; |
b0a6363c PM |
1516 | unsigned int j; |
1517 | int ret, off, h; | |
2722971c DM |
1518 | |
1519 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1520 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
1521 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { | |
2722971c DM |
1522 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1523 | return -EINVAL; | |
1524 | } | |
1525 | ||
1526 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1527 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1528 | duprintf("checking: element %p size %u\n", |
1529 | e, e->next_offset); | |
1530 | return -EINVAL; | |
1531 | } | |
1532 | ||
73cd598d PM |
1533 | /* For purposes of check_entry casting the compat entry is fine */ |
1534 | ret = check_entry((struct ipt_entry *)e, name); | |
a96be246 DM |
1535 | if (ret) |
1536 | return ret; | |
590bdf7f | 1537 | |
30c08c41 | 1538 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1539 | entry_offset = (void *)e - (void *)base; |
1540 | j = 0; | |
dcea992a JE |
1541 | xt_ematch_foreach(ematch, e) { |
1542 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1543 | &e->ip, e->comefrom, &off); |
dcea992a | 1544 | if (ret != 0) |
6bdb331b JE |
1545 | goto release_matches; |
1546 | ++j; | |
dcea992a | 1547 | } |
2722971c | 1548 | |
73cd598d | 1549 | t = compat_ipt_get_target(e); |
d2a7b6ba JE |
1550 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
1551 | t->u.user.revision); | |
1552 | if (IS_ERR(target)) { | |
a96be246 | 1553 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1554 | t->u.user.name); |
d2a7b6ba | 1555 | ret = PTR_ERR(target); |
4c1b52bc | 1556 | goto release_matches; |
2722971c DM |
1557 | } |
1558 | t->u.kernel.target = target; | |
1559 | ||
9fa492cd | 1560 | off += xt_compat_target_offset(target); |
2722971c | 1561 | *size += off; |
b386d9f5 | 1562 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1563 | if (ret) |
1564 | goto out; | |
1565 | ||
1566 | /* Check hooks & underflows */ | |
6e23ae2a | 1567 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1568 | if ((unsigned char *)e - base == hook_entries[h]) |
1569 | newinfo->hook_entry[h] = hook_entries[h]; | |
1570 | if ((unsigned char *)e - base == underflows[h]) | |
1571 | newinfo->underflow[h] = underflows[h]; | |
1572 | } | |
1573 | ||
1574 | /* Clear counters and comefrom */ | |
73cd598d | 1575 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c | 1576 | e->comefrom = 0; |
2722971c | 1577 | return 0; |
bec71b16 | 1578 | |
2722971c | 1579 | out: |
bec71b16 | 1580 | module_put(t->u.kernel.target->me); |
4c1b52bc | 1581 | release_matches: |
6bdb331b JE |
1582 | xt_ematch_foreach(ematch, e) { |
1583 | if (j-- == 0) | |
dcea992a | 1584 | break; |
6bdb331b JE |
1585 | module_put(ematch->u.kernel.match->me); |
1586 | } | |
2722971c DM |
1587 | return ret; |
1588 | } | |
1589 | ||
4b478248 | 1590 | static int |
73cd598d | 1591 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1592 | unsigned int *size, const char *name, |
1593 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c DM |
1594 | { |
1595 | struct ipt_entry_target *t; | |
6709dbbb | 1596 | struct xt_target *target; |
2722971c DM |
1597 | struct ipt_entry *de; |
1598 | unsigned int origsize; | |
920b868a | 1599 | int ret, h; |
dcea992a | 1600 | struct xt_entry_match *ematch; |
2722971c DM |
1601 | |
1602 | ret = 0; | |
1603 | origsize = *size; | |
1604 | de = (struct ipt_entry *)*dstptr; | |
1605 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1606 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1607 | |
73cd598d | 1608 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1609 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1610 | ||
dcea992a JE |
1611 | xt_ematch_foreach(ematch, e) { |
1612 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1613 | if (ret != 0) | |
6bdb331b | 1614 | return ret; |
dcea992a | 1615 | } |
2722971c | 1616 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1617 | t = compat_ipt_get_target(e); |
2722971c | 1618 | target = t->u.kernel.target; |
9fa492cd | 1619 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1620 | |
1621 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1622 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1623 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1624 | newinfo->hook_entry[h] -= origsize - *size; | |
1625 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1626 | newinfo->underflow[h] -= origsize - *size; | |
1627 | } | |
f6677f43 DM |
1628 | return ret; |
1629 | } | |
1630 | ||
022748a9 | 1631 | static int |
0559518b | 1632 | compat_check_entry(struct ipt_entry *e, struct net *net, const char *name) |
f6677f43 | 1633 | { |
dcea992a | 1634 | struct xt_entry_match *ematch; |
9b4fce7a | 1635 | struct xt_mtchk_param mtpar; |
b0a6363c | 1636 | unsigned int j; |
dcea992a | 1637 | int ret = 0; |
f6677f43 | 1638 | |
4c1b52bc | 1639 | j = 0; |
a83d8e8d | 1640 | mtpar.net = net; |
9b4fce7a JE |
1641 | mtpar.table = name; |
1642 | mtpar.entryinfo = &e->ip; | |
1643 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1644 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 1645 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1646 | ret = check_match(ematch, &mtpar); |
dcea992a | 1647 | if (ret != 0) |
6bdb331b JE |
1648 | goto cleanup_matches; |
1649 | ++j; | |
dcea992a | 1650 | } |
4c1b52bc | 1651 | |
add67461 | 1652 | ret = check_target(e, net, name); |
4c1b52bc DM |
1653 | if (ret) |
1654 | goto cleanup_matches; | |
4c1b52bc DM |
1655 | return 0; |
1656 | ||
1657 | cleanup_matches: | |
6bdb331b JE |
1658 | xt_ematch_foreach(ematch, e) { |
1659 | if (j-- == 0) | |
dcea992a | 1660 | break; |
6bdb331b JE |
1661 | cleanup_match(ematch, net); |
1662 | } | |
4c1b52bc | 1663 | return ret; |
f6677f43 DM |
1664 | } |
1665 | ||
1da177e4 | 1666 | static int |
a83d8e8d AD |
1667 | translate_compat_table(struct net *net, |
1668 | const char *name, | |
4b478248 PM |
1669 | unsigned int valid_hooks, |
1670 | struct xt_table_info **pinfo, | |
1671 | void **pentry0, | |
1672 | unsigned int total_size, | |
1673 | unsigned int number, | |
1674 | unsigned int *hook_entries, | |
1675 | unsigned int *underflows) | |
1da177e4 | 1676 | { |
920b868a | 1677 | unsigned int i, j; |
2722971c DM |
1678 | struct xt_table_info *newinfo, *info; |
1679 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1680 | struct compat_ipt_entry *iter0; |
1681 | struct ipt_entry *iter1; | |
2722971c | 1682 | unsigned int size; |
0559518b | 1683 | int ret; |
1da177e4 | 1684 | |
2722971c DM |
1685 | info = *pinfo; |
1686 | entry0 = *pentry0; | |
1687 | size = total_size; | |
1688 | info->number = number; | |
1689 | ||
1690 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1691 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1692 | info->hook_entry[i] = 0xFFFFFFFF; |
1693 | info->underflow[i] = 0xFFFFFFFF; | |
1694 | } | |
1695 | ||
1696 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1697 | j = 0; |
2722971c DM |
1698 | xt_compat_lock(AF_INET); |
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 | } |
2722971c DM |
1711 | |
1712 | ret = -EINVAL; | |
920b868a | 1713 | if (j != number) { |
2722971c | 1714 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1715 | j, number); |
2722971c DM |
1716 | goto out_unlock; |
1717 | } | |
1718 | ||
1719 | /* Check hooks all assigned */ | |
6e23ae2a | 1720 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
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; | |
1da177e4 | 1728 | } |
2722971c DM |
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; | |
6e23ae2a | 1742 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1743 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1744 | newinfo->underflow[i] = info->underflow[i]; | |
1745 | } | |
1746 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1747 | pos = entry1; | |
4b478248 | 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 | } | |
b386d9f5 | 1755 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1756 | xt_compat_unlock(AF_INET); |
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 | ||
4c1b52bc | 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 | } |
4c1b52bc | 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; | |
4c1b52bc | 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 | } | |
4c1b52bc DM |
1791 | xt_free_table_info(newinfo); |
1792 | return ret; | |
1793 | } | |
f6677f43 | 1794 | |
2722971c | 1795 | /* And one copy for every other CPU */ |
fb1bb34d | 1796 | for_each_possible_cpu(i) |
2722971c DM |
1797 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1798 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1799 | ||
1800 | *pinfo = newinfo; | |
1801 | *pentry0 = entry1; | |
1802 | xt_free_table_info(info); | |
1803 | return 0; | |
1da177e4 | 1804 | |
2722971c DM |
1805 | free_newinfo: |
1806 | xt_free_table_info(newinfo); | |
1807 | out: | |
0559518b JE |
1808 | xt_entry_foreach(iter0, entry0, total_size) { |
1809 | if (j-- == 0) | |
72b2b1dd | 1810 | break; |
0559518b JE |
1811 | compat_release_entry(iter0); |
1812 | } | |
1da177e4 | 1813 | return ret; |
2722971c | 1814 | out_unlock: |
b386d9f5 | 1815 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1816 | xt_compat_unlock(AF_INET); |
1817 | goto out; | |
1da177e4 LT |
1818 | } |
1819 | ||
1820 | static int | |
34bd137b | 1821 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1822 | { |
1823 | int ret; | |
2722971c DM |
1824 | struct compat_ipt_replace tmp; |
1825 | struct xt_table_info *newinfo; | |
1826 | void *loc_cpu_entry; | |
72b2b1dd | 1827 | struct ipt_entry *iter; |
1da177e4 LT |
1828 | |
1829 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1830 | return -EFAULT; | |
1831 | ||
ee4bb818 | 1832 | /* overflow check */ |
259d4e41 | 1833 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1834 | return -ENOMEM; |
1835 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1836 | return -ENOMEM; | |
1837 | ||
2e4e6a17 | 1838 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1839 | if (!newinfo) |
1840 | return -ENOMEM; | |
1841 | ||
9c547959 | 1842 | /* choose the copy that is on our node/cpu */ |
31836064 ED |
1843 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1844 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1845 | tmp.size) != 0) { |
1846 | ret = -EFAULT; | |
1847 | goto free_newinfo; | |
1848 | } | |
1849 | ||
a83d8e8d | 1850 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
4b478248 PM |
1851 | &newinfo, &loc_cpu_entry, tmp.size, |
1852 | tmp.num_entries, tmp.hook_entry, | |
1853 | tmp.underflow); | |
2722971c | 1854 | if (ret != 0) |
1da177e4 | 1855 | goto free_newinfo; |
1da177e4 | 1856 | |
2722971c | 1857 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1858 | |
34bd137b | 1859 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1860 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1861 | if (ret) |
1862 | goto free_newinfo_untrans; | |
1863 | return 0; | |
1da177e4 | 1864 | |
2722971c | 1865 | free_newinfo_untrans: |
72b2b1dd | 1866 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1867 | cleanup_entry(iter, net); |
2722971c DM |
1868 | free_newinfo: |
1869 | xt_free_table_info(newinfo); | |
1870 | return ret; | |
1871 | } | |
1da177e4 | 1872 | |
2722971c DM |
1873 | static int |
1874 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1875 | unsigned int len) |
2722971c DM |
1876 | { |
1877 | int ret; | |
1da177e4 | 1878 | |
2722971c DM |
1879 | if (!capable(CAP_NET_ADMIN)) |
1880 | return -EPERM; | |
1da177e4 | 1881 | |
2722971c DM |
1882 | switch (cmd) { |
1883 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1884 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1885 | break; |
1da177e4 | 1886 | |
2722971c | 1887 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1888 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1889 | break; |
1890 | ||
1891 | default: | |
1892 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1893 | ret = -EINVAL; | |
1894 | } | |
1da177e4 | 1895 | |
1da177e4 LT |
1896 | return ret; |
1897 | } | |
1898 | ||
4b478248 | 1899 | struct compat_ipt_get_entries { |
2722971c DM |
1900 | char name[IPT_TABLE_MAXNAMELEN]; |
1901 | compat_uint_t size; | |
1902 | struct compat_ipt_entry entrytable[0]; | |
1903 | }; | |
1da177e4 | 1904 | |
4b478248 PM |
1905 | static int |
1906 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1907 | void __user *userptr) | |
2722971c | 1908 | { |
2722971c | 1909 | struct xt_counters *counters; |
5452e425 | 1910 | const struct xt_table_info *private = table->private; |
2722971c DM |
1911 | void __user *pos; |
1912 | unsigned int size; | |
1913 | int ret = 0; | |
5452e425 | 1914 | const void *loc_cpu_entry; |
a18aa31b | 1915 | unsigned int i = 0; |
72b2b1dd | 1916 | struct ipt_entry *iter; |
1da177e4 | 1917 | |
2722971c DM |
1918 | counters = alloc_counters(table); |
1919 | if (IS_ERR(counters)) | |
1920 | return PTR_ERR(counters); | |
1921 | ||
1922 | /* choose the copy that is on our node/cpu, ... | |
1923 | * This choice is lazy (because current thread is | |
1924 | * allowed to migrate to another cpu) | |
1925 | */ | |
1926 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1927 | pos = userptr; | |
1928 | size = total_size; | |
72b2b1dd JE |
1929 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1930 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1931 | &size, counters, i++); |
72b2b1dd JE |
1932 | if (ret != 0) |
1933 | break; | |
1934 | } | |
2722971c | 1935 | |
2722971c DM |
1936 | vfree(counters); |
1937 | return ret; | |
1da177e4 LT |
1938 | } |
1939 | ||
1940 | static int | |
34bd137b AD |
1941 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1942 | int *len) | |
1da177e4 | 1943 | { |
2722971c DM |
1944 | int ret; |
1945 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1946 | struct xt_table *t; |
1da177e4 | 1947 | |
2722971c | 1948 | if (*len < sizeof(get)) { |
c9d8fe13 | 1949 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1950 | return -EINVAL; |
2722971c | 1951 | } |
1da177e4 | 1952 | |
2722971c DM |
1953 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1954 | return -EFAULT; | |
1da177e4 | 1955 | |
2722971c | 1956 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1957 | duprintf("compat_get_entries: %u != %zu\n", |
1958 | *len, sizeof(get) + get.size); | |
2722971c | 1959 | return -EINVAL; |
1da177e4 LT |
1960 | } |
1961 | ||
2722971c | 1962 | xt_compat_lock(AF_INET); |
34bd137b | 1963 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1964 | if (t && !IS_ERR(t)) { |
5452e425 | 1965 | const struct xt_table_info *private = t->private; |
2722971c | 1966 | struct xt_table_info info; |
9c547959 | 1967 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1968 | ret = compat_table_info(private, &info); |
1969 | if (!ret && get.size == info.size) { | |
1970 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 1971 | t, uptr->entrytable); |
2722971c DM |
1972 | } else if (!ret) { |
1973 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1974 | private->size, get.size); |
544473c1 | 1975 | ret = -EAGAIN; |
2722971c | 1976 | } |
b386d9f5 | 1977 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1978 | module_put(t->me); |
1979 | xt_table_unlock(t); | |
1980 | } else | |
1da177e4 | 1981 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1982 | |
2722971c DM |
1983 | xt_compat_unlock(AF_INET); |
1984 | return ret; | |
1985 | } | |
1da177e4 | 1986 | |
79030ed0 PM |
1987 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1988 | ||
2722971c DM |
1989 | static int |
1990 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1991 | { | |
1992 | int ret; | |
1da177e4 | 1993 | |
82fac054 BS |
1994 | if (!capable(CAP_NET_ADMIN)) |
1995 | return -EPERM; | |
1996 | ||
2722971c DM |
1997 | switch (cmd) { |
1998 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1999 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
2000 | break; |
2001 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 2002 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
2003 | break; |
2004 | default: | |
79030ed0 | 2005 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 2006 | } |
1da177e4 LT |
2007 | return ret; |
2008 | } | |
2722971c | 2009 | #endif |
1da177e4 LT |
2010 | |
2011 | static int | |
9c547959 | 2012 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
2013 | { |
2014 | int ret; | |
2015 | ||
2016 | if (!capable(CAP_NET_ADMIN)) | |
2017 | return -EPERM; | |
2018 | ||
2019 | switch (cmd) { | |
2020 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 2021 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2022 | break; |
2023 | ||
2024 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2025 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2026 | break; |
2027 | ||
2028 | default: | |
2029 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
2030 | ret = -EINVAL; | |
2031 | } | |
2032 | ||
2033 | return ret; | |
2034 | } | |
2035 | ||
2036 | static int | |
2037 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2038 | { | |
2039 | int ret; | |
2040 | ||
2041 | if (!capable(CAP_NET_ADMIN)) | |
2042 | return -EPERM; | |
2043 | ||
2044 | switch (cmd) { | |
2722971c | 2045 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2046 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2047 | break; |
1da177e4 | 2048 | |
2722971c | 2049 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2050 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2051 | break; |
1da177e4 LT |
2052 | |
2053 | case IPT_SO_GET_REVISION_MATCH: | |
2054 | case IPT_SO_GET_REVISION_TARGET: { | |
2055 | struct ipt_get_revision rev; | |
2e4e6a17 | 2056 | int target; |
1da177e4 LT |
2057 | |
2058 | if (*len != sizeof(rev)) { | |
2059 | ret = -EINVAL; | |
2060 | break; | |
2061 | } | |
2062 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2063 | ret = -EFAULT; | |
2064 | break; | |
2065 | } | |
2066 | ||
2067 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2068 | target = 1; |
1da177e4 | 2069 | else |
2e4e6a17 | 2070 | target = 0; |
1da177e4 | 2071 | |
2e4e6a17 HW |
2072 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2073 | rev.revision, | |
2074 | target, &ret), | |
1da177e4 LT |
2075 | "ipt_%s", rev.name); |
2076 | break; | |
2077 | } | |
2078 | ||
2079 | default: | |
2080 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2081 | ret = -EINVAL; | |
2082 | } | |
2083 | ||
2084 | return ret; | |
2085 | } | |
2086 | ||
35aad0ff JE |
2087 | struct xt_table *ipt_register_table(struct net *net, |
2088 | const struct xt_table *table, | |
44d34e72 | 2089 | const struct ipt_replace *repl) |
1da177e4 LT |
2090 | { |
2091 | int ret; | |
2e4e6a17 | 2092 | struct xt_table_info *newinfo; |
f3c5c1bf | 2093 | struct xt_table_info bootstrap = {0}; |
31836064 | 2094 | void *loc_cpu_entry; |
a98da11d | 2095 | struct xt_table *new_table; |
1da177e4 | 2096 | |
2e4e6a17 | 2097 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2098 | if (!newinfo) { |
2099 | ret = -ENOMEM; | |
2100 | goto out; | |
2101 | } | |
1da177e4 | 2102 | |
9c547959 | 2103 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2104 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2105 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2106 | |
0f234214 | 2107 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2108 | if (ret != 0) |
2109 | goto out_free; | |
1da177e4 | 2110 | |
44d34e72 | 2111 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2112 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2113 | ret = PTR_ERR(new_table); |
2114 | goto out_free; | |
1da177e4 LT |
2115 | } |
2116 | ||
44d34e72 AD |
2117 | return new_table; |
2118 | ||
2119 | out_free: | |
2120 | xt_free_table_info(newinfo); | |
2121 | out: | |
2122 | return ERR_PTR(ret); | |
1da177e4 LT |
2123 | } |
2124 | ||
f54e9367 | 2125 | void ipt_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2126 | { |
2e4e6a17 | 2127 | struct xt_table_info *private; |
31836064 | 2128 | void *loc_cpu_entry; |
df200969 | 2129 | struct module *table_owner = table->me; |
72b2b1dd | 2130 | struct ipt_entry *iter; |
31836064 | 2131 | |
e905a9ed | 2132 | private = xt_unregister_table(table); |
1da177e4 LT |
2133 | |
2134 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2135 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2136 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2137 | cleanup_entry(iter, net); |
df200969 AD |
2138 | if (private->number > private->initial_entries) |
2139 | module_put(table_owner); | |
2e4e6a17 | 2140 | xt_free_table_info(private); |
1da177e4 LT |
2141 | } |
2142 | ||
2143 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2144 | static inline bool |
1da177e4 LT |
2145 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2146 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2147 | bool invert) |
1da177e4 | 2148 | { |
9c547959 PM |
2149 | return ((test_type == 0xFF) || |
2150 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2151 | ^ invert; |
2152 | } | |
2153 | ||
1d93a9cb | 2154 | static bool |
f7108a20 | 2155 | icmp_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2156 | { |
5452e425 JE |
2157 | const struct icmphdr *ic; |
2158 | struct icmphdr _icmph; | |
f7108a20 | 2159 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2160 | |
2161 | /* Must not be a fragment. */ | |
f7108a20 | 2162 | if (par->fragoff != 0) |
1d93a9cb | 2163 | return false; |
1da177e4 | 2164 | |
f7108a20 | 2165 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2166 | if (ic == NULL) { |
2167 | /* We've been asked to examine this packet, and we | |
2168 | * can't. Hence, no choice but to drop. | |
2169 | */ | |
2170 | duprintf("Dropping evil ICMP tinygram.\n"); | |
f7108a20 | 2171 | *par->hotdrop = true; |
1d93a9cb | 2172 | return false; |
1da177e4 LT |
2173 | } |
2174 | ||
2175 | return icmp_type_code_match(icmpinfo->type, | |
2176 | icmpinfo->code[0], | |
2177 | icmpinfo->code[1], | |
2178 | ic->type, ic->code, | |
2179 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2180 | } | |
2181 | ||
b0f38452 | 2182 | static int icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2183 | { |
9b4fce7a | 2184 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2185 | |
1d5cd909 | 2186 | /* Must specify no unknown invflags */ |
bd414ee6 | 2187 | return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2188 | } |
2189 | ||
2190 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2191 | static struct xt_target ipt_standard_target __read_mostly = { |
1da177e4 | 2192 | .name = IPT_STANDARD_TARGET, |
1d5cd909 | 2193 | .targetsize = sizeof(int), |
4ba351cf | 2194 | .family = NFPROTO_IPV4, |
2722971c | 2195 | #ifdef CONFIG_COMPAT |
9fa492cd PM |
2196 | .compatsize = sizeof(compat_int_t), |
2197 | .compat_from_user = compat_standard_from_user, | |
2198 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2199 | #endif |
1da177e4 LT |
2200 | }; |
2201 | ||
9f15c530 | 2202 | static struct xt_target ipt_error_target __read_mostly = { |
1da177e4 LT |
2203 | .name = IPT_ERROR_TARGET, |
2204 | .target = ipt_error, | |
1d5cd909 | 2205 | .targetsize = IPT_FUNCTION_MAXNAMELEN, |
4ba351cf | 2206 | .family = NFPROTO_IPV4, |
1da177e4 LT |
2207 | }; |
2208 | ||
2209 | static struct nf_sockopt_ops ipt_sockopts = { | |
2210 | .pf = PF_INET, | |
2211 | .set_optmin = IPT_BASE_CTL, | |
2212 | .set_optmax = IPT_SO_SET_MAX+1, | |
2213 | .set = do_ipt_set_ctl, | |
2722971c DM |
2214 | #ifdef CONFIG_COMPAT |
2215 | .compat_set = compat_do_ipt_set_ctl, | |
2216 | #endif | |
1da177e4 LT |
2217 | .get_optmin = IPT_BASE_CTL, |
2218 | .get_optmax = IPT_SO_GET_MAX+1, | |
2219 | .get = do_ipt_get_ctl, | |
2722971c DM |
2220 | #ifdef CONFIG_COMPAT |
2221 | .compat_get = compat_do_ipt_get_ctl, | |
2222 | #endif | |
16fcec35 | 2223 | .owner = THIS_MODULE, |
1da177e4 LT |
2224 | }; |
2225 | ||
9f15c530 | 2226 | static struct xt_match icmp_matchstruct __read_mostly = { |
1da177e4 | 2227 | .name = "icmp", |
1d5cd909 PM |
2228 | .match = icmp_match, |
2229 | .matchsize = sizeof(struct ipt_icmp), | |
9c547959 | 2230 | .checkentry = icmp_checkentry, |
1d5cd909 | 2231 | .proto = IPPROTO_ICMP, |
4ba351cf | 2232 | .family = NFPROTO_IPV4, |
1da177e4 LT |
2233 | }; |
2234 | ||
3cb609d5 AD |
2235 | static int __net_init ip_tables_net_init(struct net *net) |
2236 | { | |
383ca5b8 | 2237 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
2238 | } |
2239 | ||
2240 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2241 | { | |
383ca5b8 | 2242 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
2243 | } |
2244 | ||
2245 | static struct pernet_operations ip_tables_net_ops = { | |
2246 | .init = ip_tables_net_init, | |
2247 | .exit = ip_tables_net_exit, | |
2248 | }; | |
2249 | ||
65b4b4e8 | 2250 | static int __init ip_tables_init(void) |
1da177e4 LT |
2251 | { |
2252 | int ret; | |
2253 | ||
3cb609d5 | 2254 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2255 | if (ret < 0) |
2256 | goto err1; | |
2e4e6a17 | 2257 | |
1da177e4 | 2258 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2259 | ret = xt_register_target(&ipt_standard_target); |
2260 | if (ret < 0) | |
2261 | goto err2; | |
2262 | ret = xt_register_target(&ipt_error_target); | |
2263 | if (ret < 0) | |
2264 | goto err3; | |
2265 | ret = xt_register_match(&icmp_matchstruct); | |
2266 | if (ret < 0) | |
2267 | goto err4; | |
1da177e4 LT |
2268 | |
2269 | /* Register setsockopt */ | |
2270 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2271 | if (ret < 0) |
2272 | goto err5; | |
1da177e4 | 2273 | |
ff67e4e4 | 2274 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2275 | return 0; |
0eff66e6 PM |
2276 | |
2277 | err5: | |
2278 | xt_unregister_match(&icmp_matchstruct); | |
2279 | err4: | |
2280 | xt_unregister_target(&ipt_error_target); | |
2281 | err3: | |
2282 | xt_unregister_target(&ipt_standard_target); | |
2283 | err2: | |
3cb609d5 | 2284 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2285 | err1: |
2286 | return ret; | |
1da177e4 LT |
2287 | } |
2288 | ||
65b4b4e8 | 2289 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2290 | { |
2291 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2292 | |
a45049c5 PNA |
2293 | xt_unregister_match(&icmp_matchstruct); |
2294 | xt_unregister_target(&ipt_error_target); | |
2295 | xt_unregister_target(&ipt_standard_target); | |
2e4e6a17 | 2296 | |
3cb609d5 | 2297 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2298 | } |
2299 | ||
2300 | EXPORT_SYMBOL(ipt_register_table); | |
2301 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2302 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2303 | module_init(ip_tables_init); |
2304 | module_exit(ip_tables_fini); |