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 | 323 | { |
bb70dfa5 JE |
324 | #define tb_comefrom ((struct ipt_entry *)table_base)->comefrom |
325 | ||
1da177e4 | 326 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
5452e425 | 327 | const struct iphdr *ip; |
cff533ac | 328 | bool hotdrop = false; |
1da177e4 LT |
329 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
330 | unsigned int verdict = NF_DROP; | |
331 | const char *indev, *outdev; | |
d5d1baa1 | 332 | const void *table_base; |
1da177e4 | 333 | struct ipt_entry *e, *back; |
d5d1baa1 | 334 | const struct xt_table_info *private; |
f7108a20 | 335 | struct xt_match_param mtpar; |
7eb35586 | 336 | struct xt_target_param tgpar; |
1da177e4 LT |
337 | |
338 | /* Initialization */ | |
3db05fea | 339 | ip = ip_hdr(skb); |
1da177e4 LT |
340 | indev = in ? in->name : nulldevname; |
341 | outdev = out ? out->name : nulldevname; | |
342 | /* We handle fragments by dealing with the first fragment as | |
343 | * if it was a normal packet. All other fragments are treated | |
344 | * normally, except that they will NEVER match rules that ask | |
345 | * things we don't know, ie. tcp syn flag or ports). If the | |
346 | * rule is also a fragment-specific rule, non-fragments won't | |
347 | * match it. */ | |
f7108a20 JE |
348 | mtpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
349 | mtpar.thoff = ip_hdrlen(skb); | |
350 | mtpar.hotdrop = &hotdrop; | |
7eb35586 JE |
351 | mtpar.in = tgpar.in = in; |
352 | mtpar.out = tgpar.out = out; | |
916a917d | 353 | mtpar.family = tgpar.family = NFPROTO_IPV4; |
a5e78820 | 354 | mtpar.hooknum = tgpar.hooknum = hook; |
1da177e4 | 355 | |
1da177e4 | 356 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
942e4a2b SH |
357 | xt_info_rdlock_bh(); |
358 | private = table->private; | |
359 | table_base = private->entries[smp_processor_id()]; | |
78454473 | 360 | |
2e4e6a17 | 361 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 LT |
362 | |
363 | /* For return from builtin chain */ | |
2e4e6a17 | 364 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
365 | |
366 | do { | |
d5d1baa1 | 367 | const struct ipt_entry_target *t; |
dcea992a | 368 | const struct xt_entry_match *ematch; |
a1ff4ac8 | 369 | |
1da177e4 LT |
370 | IP_NF_ASSERT(e); |
371 | IP_NF_ASSERT(back); | |
a1ff4ac8 | 372 | if (!ip_packet_match(ip, indev, outdev, |
dcea992a JE |
373 | &e->ip, mtpar.fragoff)) { |
374 | no_match: | |
a1ff4ac8 JE |
375 | e = ipt_next_entry(e); |
376 | continue; | |
377 | } | |
1da177e4 | 378 | |
dcea992a JE |
379 | xt_ematch_foreach(ematch, e) |
380 | if (do_match(ematch, skb, &mtpar) != 0) | |
381 | goto no_match; | |
382 | ||
a1ff4ac8 | 383 | ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1); |
1da177e4 | 384 | |
a1ff4ac8 JE |
385 | t = ipt_get_target(e); |
386 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
387 | |
388 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
389 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
a1ff4ac8 JE |
390 | /* The packet is traced: log it */ |
391 | if (unlikely(skb->nf_trace)) | |
392 | trace_packet(skb, hook, in, out, | |
393 | table->name, private, e); | |
ba9dda3a | 394 | #endif |
a1ff4ac8 JE |
395 | /* Standard target? */ |
396 | if (!t->u.kernel.target->target) { | |
397 | int v; | |
398 | ||
399 | v = ((struct ipt_standard_target *)t)->verdict; | |
400 | if (v < 0) { | |
401 | /* Pop from stack? */ | |
402 | if (v != IPT_RETURN) { | |
403 | verdict = (unsigned)(-v) - 1; | |
404 | break; | |
1da177e4 | 405 | } |
a1ff4ac8 JE |
406 | e = back; |
407 | back = get_entry(table_base, back->comefrom); | |
408 | continue; | |
409 | } | |
3666ed1c JP |
410 | if (table_base + v != ipt_next_entry(e) && |
411 | !(e->ip.flags & IPT_F_GOTO)) { | |
a1ff4ac8 JE |
412 | /* Save old back ptr in next entry */ |
413 | struct ipt_entry *next = ipt_next_entry(e); | |
414 | next->comefrom = (void *)back - table_base; | |
415 | /* set back pointer to next entry */ | |
416 | back = next; | |
417 | } | |
1da177e4 | 418 | |
a1ff4ac8 | 419 | e = get_entry(table_base, v); |
7a6b1c46 JE |
420 | continue; |
421 | } | |
422 | ||
423 | /* Targets which reenter must return | |
424 | abs. verdicts */ | |
425 | tgpar.target = t->u.kernel.target; | |
426 | tgpar.targinfo = t->data; | |
bb70dfa5 JE |
427 | |
428 | ||
1da177e4 | 429 | #ifdef CONFIG_NETFILTER_DEBUG |
bb70dfa5 | 430 | tb_comefrom = 0xeeeeeeec; |
1da177e4 | 431 | #endif |
7a6b1c46 | 432 | verdict = t->u.kernel.target->target(skb, &tgpar); |
1da177e4 | 433 | #ifdef CONFIG_NETFILTER_DEBUG |
24992eac | 434 | if (tb_comefrom != 0xeeeeeeec && verdict == IPT_CONTINUE) { |
7a6b1c46 JE |
435 | printk("Target %s reentered!\n", |
436 | t->u.kernel.target->name); | |
437 | verdict = NF_DROP; | |
1da177e4 | 438 | } |
bb70dfa5 | 439 | tb_comefrom = 0x57acc001; |
7a6b1c46 JE |
440 | #endif |
441 | /* Target might have changed stuff. */ | |
442 | ip = ip_hdr(skb); | |
7a6b1c46 JE |
443 | if (verdict == IPT_CONTINUE) |
444 | e = ipt_next_entry(e); | |
445 | else | |
446 | /* Verdict */ | |
447 | break; | |
1da177e4 | 448 | } while (!hotdrop); |
942e4a2b | 449 | xt_info_rdunlock_bh(); |
1da177e4 LT |
450 | |
451 | #ifdef DEBUG_ALLOW_ALL | |
452 | return NF_ACCEPT; | |
453 | #else | |
454 | if (hotdrop) | |
455 | return NF_DROP; | |
456 | else return verdict; | |
457 | #endif | |
bb70dfa5 JE |
458 | |
459 | #undef tb_comefrom | |
1da177e4 LT |
460 | } |
461 | ||
1da177e4 LT |
462 | /* Figures out from what hook each rule can be called: returns 0 if |
463 | there are loops. Puts hook bitmask in comefrom. */ | |
464 | static int | |
d5d1baa1 | 465 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 466 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
467 | { |
468 | unsigned int hook; | |
469 | ||
470 | /* No recursion; use packet counter to save back ptrs (reset | |
471 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 472 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 473 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 474 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
475 | |
476 | if (!(valid_hooks & (1 << hook))) | |
477 | continue; | |
478 | ||
479 | /* Set initial back pointer. */ | |
480 | e->counters.pcnt = pos; | |
481 | ||
482 | for (;;) { | |
d5d1baa1 JE |
483 | const struct ipt_standard_target *t |
484 | = (void *)ipt_get_target_c(e); | |
e1b4b9f3 | 485 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 486 | |
6e23ae2a | 487 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
488 | printk("iptables: loop hook %u pos %u %08X.\n", |
489 | hook, pos, e->comefrom); | |
490 | return 0; | |
491 | } | |
9c547959 | 492 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
493 | |
494 | /* Unconditional return/END. */ | |
3666ed1c JP |
495 | if ((e->target_offset == sizeof(struct ipt_entry) && |
496 | (strcmp(t->target.u.user.name, | |
497 | IPT_STANDARD_TARGET) == 0) && | |
498 | t->verdict < 0 && unconditional(&e->ip)) || | |
499 | visited) { | |
1da177e4 LT |
500 | unsigned int oldpos, size; |
501 | ||
1f9352ae PM |
502 | if ((strcmp(t->target.u.user.name, |
503 | IPT_STANDARD_TARGET) == 0) && | |
504 | t->verdict < -NF_MAX_VERDICT - 1) { | |
74c9c0c1 DM |
505 | duprintf("mark_source_chains: bad " |
506 | "negative verdict (%i)\n", | |
507 | t->verdict); | |
508 | return 0; | |
509 | } | |
510 | ||
1da177e4 LT |
511 | /* Return: backtrack through the last |
512 | big jump. */ | |
513 | do { | |
6e23ae2a | 514 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
515 | #ifdef DEBUG_IP_FIREWALL_USER |
516 | if (e->comefrom | |
6e23ae2a | 517 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
518 | duprintf("Back unset " |
519 | "on hook %u " | |
520 | "rule %u\n", | |
521 | hook, pos); | |
522 | } | |
523 | #endif | |
524 | oldpos = pos; | |
525 | pos = e->counters.pcnt; | |
526 | e->counters.pcnt = 0; | |
527 | ||
528 | /* We're at the start. */ | |
529 | if (pos == oldpos) | |
530 | goto next; | |
531 | ||
532 | e = (struct ipt_entry *) | |
31836064 | 533 | (entry0 + pos); |
1da177e4 LT |
534 | } while (oldpos == pos + e->next_offset); |
535 | ||
536 | /* Move along one */ | |
537 | size = e->next_offset; | |
538 | e = (struct ipt_entry *) | |
31836064 | 539 | (entry0 + pos + size); |
1da177e4 LT |
540 | e->counters.pcnt = pos; |
541 | pos += size; | |
542 | } else { | |
543 | int newpos = t->verdict; | |
544 | ||
545 | if (strcmp(t->target.u.user.name, | |
3666ed1c JP |
546 | IPT_STANDARD_TARGET) == 0 && |
547 | newpos >= 0) { | |
74c9c0c1 DM |
548 | if (newpos > newinfo->size - |
549 | sizeof(struct ipt_entry)) { | |
550 | duprintf("mark_source_chains: " | |
551 | "bad verdict (%i)\n", | |
552 | newpos); | |
553 | return 0; | |
554 | } | |
1da177e4 LT |
555 | /* This a jump; chase it. */ |
556 | duprintf("Jump rule %u -> %u\n", | |
557 | pos, newpos); | |
558 | } else { | |
559 | /* ... this is a fallthru */ | |
560 | newpos = pos + e->next_offset; | |
561 | } | |
562 | e = (struct ipt_entry *) | |
31836064 | 563 | (entry0 + newpos); |
1da177e4 LT |
564 | e->counters.pcnt = pos; |
565 | pos = newpos; | |
566 | } | |
567 | } | |
568 | next: | |
569 | duprintf("Finished chain %u\n", hook); | |
570 | } | |
571 | return 1; | |
572 | } | |
573 | ||
6bdb331b | 574 | static void cleanup_match(struct ipt_entry_match *m, struct net *net) |
1da177e4 | 575 | { |
6be3d859 JE |
576 | struct xt_mtdtor_param par; |
577 | ||
f54e9367 | 578 | par.net = net; |
6be3d859 JE |
579 | par.match = m->u.kernel.match; |
580 | par.matchinfo = m->data; | |
916a917d | 581 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
582 | if (par.match->destroy != NULL) |
583 | par.match->destroy(&par); | |
584 | module_put(par.match->me); | |
1da177e4 LT |
585 | } |
586 | ||
022748a9 | 587 | static int |
d5d1baa1 | 588 | check_entry(const struct ipt_entry *e, const char *name) |
a96be246 | 589 | { |
d5d1baa1 | 590 | const struct ipt_entry_target *t; |
a96be246 DM |
591 | |
592 | if (!ip_checkentry(&e->ip)) { | |
ff67e4e4 | 593 | duprintf("ip check failed %p %s.\n", e, name); |
a96be246 DM |
594 | return -EINVAL; |
595 | } | |
596 | ||
9c547959 PM |
597 | if (e->target_offset + sizeof(struct ipt_entry_target) > |
598 | e->next_offset) | |
a96be246 DM |
599 | return -EINVAL; |
600 | ||
d5d1baa1 | 601 | t = ipt_get_target_c(e); |
a96be246 DM |
602 | if (e->target_offset + t->u.target_size > e->next_offset) |
603 | return -EINVAL; | |
604 | ||
605 | return 0; | |
606 | } | |
607 | ||
022748a9 | 608 | static int |
6bdb331b | 609 | check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par) |
a96be246 | 610 | { |
9b4fce7a | 611 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 DM |
612 | int ret; |
613 | ||
9b4fce7a JE |
614 | par->match = m->u.kernel.match; |
615 | par->matchinfo = m->data; | |
616 | ||
916a917d | 617 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 618 | ip->proto, ip->invflags & IPT_INV_PROTO); |
367c6790 | 619 | if (ret < 0) { |
ff67e4e4 | 620 | duprintf("check failed for `%s'.\n", par.match->name); |
367c6790 | 621 | return ret; |
a96be246 | 622 | } |
367c6790 | 623 | return 0; |
a96be246 DM |
624 | } |
625 | ||
022748a9 | 626 | static int |
6bdb331b | 627 | find_check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 628 | { |
6709dbbb | 629 | struct xt_match *match; |
3cdc7c95 | 630 | int ret; |
1da177e4 | 631 | |
2e4e6a17 | 632 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, |
9c547959 | 633 | m->u.user.revision), |
1da177e4 LT |
634 | "ipt_%s", m->u.user.name); |
635 | if (IS_ERR(match) || !match) { | |
a96be246 | 636 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
1da177e4 LT |
637 | return match ? PTR_ERR(match) : -ENOENT; |
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; | |
72b2b1dd | 842 | } |
1da177e4 | 843 | |
0f234214 | 844 | if (i != repl->num_entries) { |
1da177e4 | 845 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 846 | i, repl->num_entries); |
1da177e4 LT |
847 | return -EINVAL; |
848 | } | |
849 | ||
850 | /* Check hooks all assigned */ | |
6e23ae2a | 851 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 852 | /* Only hooks which are valid */ |
0f234214 | 853 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
854 | continue; |
855 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
856 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 857 | i, repl->hook_entry[i]); |
1da177e4 LT |
858 | return -EINVAL; |
859 | } | |
860 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
861 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 862 | i, repl->underflow[i]); |
1da177e4 LT |
863 | return -EINVAL; |
864 | } | |
865 | } | |
866 | ||
0f234214 | 867 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
868 | return -ELOOP; |
869 | ||
1da177e4 LT |
870 | /* Finally, each sanity check must pass */ |
871 | i = 0; | |
72b2b1dd | 872 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 873 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
874 | if (ret != 0) |
875 | break; | |
0559518b | 876 | ++i; |
72b2b1dd | 877 | } |
1da177e4 | 878 | |
74c9c0c1 | 879 | if (ret != 0) { |
0559518b JE |
880 | xt_entry_foreach(iter, entry0, newinfo->size) { |
881 | if (i-- == 0) | |
72b2b1dd | 882 | break; |
0559518b JE |
883 | cleanup_entry(iter, net); |
884 | } | |
74c9c0c1 DM |
885 | return ret; |
886 | } | |
1da177e4 LT |
887 | |
888 | /* And one copy for every other CPU */ | |
6f912042 | 889 | for_each_possible_cpu(i) { |
31836064 ED |
890 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
891 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
892 | } |
893 | ||
894 | return ret; | |
895 | } | |
896 | ||
1da177e4 | 897 | static void |
2e4e6a17 HW |
898 | get_counters(const struct xt_table_info *t, |
899 | struct xt_counters counters[]) | |
1da177e4 | 900 | { |
72b2b1dd | 901 | struct ipt_entry *iter; |
1da177e4 LT |
902 | unsigned int cpu; |
903 | unsigned int i; | |
31836064 ED |
904 | unsigned int curcpu; |
905 | ||
906 | /* Instead of clearing (by a previous call to memset()) | |
907 | * the counters and using adds, we set the counters | |
942e4a2b SH |
908 | * with data used by 'current' CPU. |
909 | * | |
910 | * Bottom half has to be disabled to prevent deadlock | |
911 | * if new softirq were to run and call ipt_do_table | |
31836064 | 912 | */ |
942e4a2b SH |
913 | local_bh_disable(); |
914 | curcpu = smp_processor_id(); | |
31836064 ED |
915 | |
916 | i = 0; | |
0559518b JE |
917 | xt_entry_foreach(iter, t->entries[curcpu], t->size) { |
918 | SET_COUNTER(counters[i], iter->counters.bcnt, | |
6b4ff2d7 | 919 | iter->counters.pcnt); |
0559518b JE |
920 | ++i; |
921 | } | |
1da177e4 | 922 | |
6f912042 | 923 | for_each_possible_cpu(cpu) { |
31836064 ED |
924 | if (cpu == curcpu) |
925 | continue; | |
1da177e4 | 926 | i = 0; |
942e4a2b | 927 | xt_info_wrlock(cpu); |
0559518b JE |
928 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
929 | ADD_COUNTER(counters[i], iter->counters.bcnt, | |
6b4ff2d7 | 930 | iter->counters.pcnt); |
0559518b JE |
931 | ++i; /* macro does multi eval of i */ |
932 | } | |
942e4a2b | 933 | xt_info_wrunlock(cpu); |
1da177e4 | 934 | } |
78454473 SH |
935 | local_bh_enable(); |
936 | } | |
937 | ||
d5d1baa1 | 938 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 939 | { |
2722971c | 940 | unsigned int countersize; |
2e4e6a17 | 941 | struct xt_counters *counters; |
d5d1baa1 | 942 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
943 | |
944 | /* We need atomic snapshot of counters: rest doesn't change | |
945 | (other than comefrom, which userspace doesn't care | |
946 | about). */ | |
2e4e6a17 | 947 | countersize = sizeof(struct xt_counters) * private->number; |
31836064 | 948 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
949 | |
950 | if (counters == NULL) | |
942e4a2b | 951 | return ERR_PTR(-ENOMEM); |
78454473 | 952 | |
942e4a2b | 953 | get_counters(private, counters); |
1da177e4 | 954 | |
2722971c DM |
955 | return counters; |
956 | } | |
957 | ||
958 | static int | |
959 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 960 | const struct xt_table *table, |
2722971c DM |
961 | void __user *userptr) |
962 | { | |
963 | unsigned int off, num; | |
d5d1baa1 | 964 | const struct ipt_entry *e; |
2722971c | 965 | struct xt_counters *counters; |
5452e425 | 966 | const struct xt_table_info *private = table->private; |
2722971c | 967 | int ret = 0; |
5452e425 | 968 | const void *loc_cpu_entry; |
2722971c DM |
969 | |
970 | counters = alloc_counters(table); | |
971 | if (IS_ERR(counters)) | |
972 | return PTR_ERR(counters); | |
973 | ||
31836064 ED |
974 | /* choose the copy that is on our node/cpu, ... |
975 | * This choice is lazy (because current thread is | |
976 | * allowed to migrate to another cpu) | |
977 | */ | |
2e4e6a17 | 978 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 979 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
980 | ret = -EFAULT; |
981 | goto free_counters; | |
982 | } | |
983 | ||
984 | /* FIXME: use iterator macros --RR */ | |
985 | /* ... then go back and fix counters and names */ | |
986 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
987 | unsigned int i; | |
5452e425 JE |
988 | const struct ipt_entry_match *m; |
989 | const struct ipt_entry_target *t; | |
1da177e4 | 990 | |
31836064 | 991 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
992 | if (copy_to_user(userptr + off |
993 | + offsetof(struct ipt_entry, counters), | |
994 | &counters[num], | |
995 | sizeof(counters[num])) != 0) { | |
996 | ret = -EFAULT; | |
997 | goto free_counters; | |
998 | } | |
999 | ||
1000 | for (i = sizeof(struct ipt_entry); | |
1001 | i < e->target_offset; | |
1002 | i += m->u.match_size) { | |
1003 | m = (void *)e + i; | |
1004 | ||
1005 | if (copy_to_user(userptr + off + i | |
1006 | + offsetof(struct ipt_entry_match, | |
1007 | u.user.name), | |
1008 | m->u.kernel.match->name, | |
1009 | strlen(m->u.kernel.match->name)+1) | |
1010 | != 0) { | |
1011 | ret = -EFAULT; | |
1012 | goto free_counters; | |
1013 | } | |
1014 | } | |
1015 | ||
d5d1baa1 | 1016 | t = ipt_get_target_c(e); |
1da177e4 LT |
1017 | if (copy_to_user(userptr + off + e->target_offset |
1018 | + offsetof(struct ipt_entry_target, | |
1019 | u.user.name), | |
1020 | t->u.kernel.target->name, | |
1021 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1022 | ret = -EFAULT; | |
1023 | goto free_counters; | |
1024 | } | |
1025 | } | |
1026 | ||
1027 | free_counters: | |
1028 | vfree(counters); | |
1029 | return ret; | |
1030 | } | |
1031 | ||
2722971c | 1032 | #ifdef CONFIG_COMPAT |
739674fb | 1033 | static void compat_standard_from_user(void *dst, const void *src) |
2722971c | 1034 | { |
9fa492cd | 1035 | int v = *(compat_int_t *)src; |
2722971c | 1036 | |
9fa492cd | 1037 | if (v > 0) |
b386d9f5 | 1038 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1039 | memcpy(dst, &v, sizeof(v)); |
1040 | } | |
46c5ea3c | 1041 | |
739674fb | 1042 | static int compat_standard_to_user(void __user *dst, const void *src) |
2722971c | 1043 | { |
9fa492cd | 1044 | compat_int_t cv = *(int *)src; |
2722971c | 1045 | |
9fa492cd | 1046 | if (cv > 0) |
b386d9f5 | 1047 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1048 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1049 | } |
1050 | ||
d5d1baa1 | 1051 | static int compat_calc_entry(const struct ipt_entry *e, |
4b478248 | 1052 | const struct xt_table_info *info, |
d5d1baa1 | 1053 | const void *base, struct xt_table_info *newinfo) |
2722971c | 1054 | { |
dcea992a | 1055 | const struct xt_entry_match *ematch; |
d5d1baa1 | 1056 | const struct ipt_entry_target *t; |
e5b5ef7d | 1057 | unsigned int entry_offset; |
2722971c DM |
1058 | int off, i, ret; |
1059 | ||
30c08c41 | 1060 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c | 1061 | entry_offset = (void *)e - base; |
dcea992a | 1062 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1063 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1064 | t = ipt_get_target_c(e); |
9fa492cd | 1065 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1066 | newinfo->size -= off; |
b386d9f5 | 1067 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1068 | if (ret) |
1069 | return ret; | |
1070 | ||
6e23ae2a | 1071 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1072 | if (info->hook_entry[i] && |
1073 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1074 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1075 | if (info->underflow[i] && |
1076 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1077 | newinfo->underflow[i] -= off; |
1078 | } | |
1079 | return 0; | |
1080 | } | |
1081 | ||
259d4e41 | 1082 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1083 | struct xt_table_info *newinfo) |
2722971c | 1084 | { |
72b2b1dd | 1085 | struct ipt_entry *iter; |
2722971c | 1086 | void *loc_cpu_entry; |
0559518b | 1087 | int ret; |
2722971c DM |
1088 | |
1089 | if (!newinfo || !info) | |
1090 | return -EINVAL; | |
1091 | ||
259d4e41 ED |
1092 | /* we dont care about newinfo->entries[] */ |
1093 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1094 | newinfo->initial_entries = 0; | |
2722971c | 1095 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
72b2b1dd JE |
1096 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1097 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1098 | if (ret != 0) | |
0559518b | 1099 | return ret; |
72b2b1dd | 1100 | } |
0559518b | 1101 | return 0; |
2722971c DM |
1102 | } |
1103 | #endif | |
1104 | ||
d5d1baa1 JE |
1105 | static int get_info(struct net *net, void __user *user, |
1106 | const int *len, int compat) | |
2722971c DM |
1107 | { |
1108 | char name[IPT_TABLE_MAXNAMELEN]; | |
e60a13e0 | 1109 | struct xt_table *t; |
2722971c DM |
1110 | int ret; |
1111 | ||
1112 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1113 | duprintf("length %u != %zu\n", *len, |
1114 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1115 | return -EINVAL; |
1116 | } | |
1117 | ||
1118 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1119 | return -EFAULT; | |
1120 | ||
1121 | name[IPT_TABLE_MAXNAMELEN-1] = '\0'; | |
1122 | #ifdef CONFIG_COMPAT | |
1123 | if (compat) | |
1124 | xt_compat_lock(AF_INET); | |
1125 | #endif | |
34bd137b | 1126 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1127 | "iptable_%s", name); |
2722971c DM |
1128 | if (t && !IS_ERR(t)) { |
1129 | struct ipt_getinfo info; | |
5452e425 | 1130 | const struct xt_table_info *private = t->private; |
2722971c | 1131 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1132 | struct xt_table_info tmp; |
1133 | ||
2722971c | 1134 | if (compat) { |
2722971c | 1135 | ret = compat_table_info(private, &tmp); |
b386d9f5 | 1136 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1137 | private = &tmp; |
2722971c DM |
1138 | } |
1139 | #endif | |
1140 | info.valid_hooks = t->valid_hooks; | |
1141 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1142 | sizeof(info.hook_entry)); |
2722971c | 1143 | memcpy(info.underflow, private->underflow, |
4b478248 | 1144 | sizeof(info.underflow)); |
2722971c DM |
1145 | info.num_entries = private->number; |
1146 | info.size = private->size; | |
1147 | strcpy(info.name, name); | |
1148 | ||
1149 | if (copy_to_user(user, &info, *len) != 0) | |
1150 | ret = -EFAULT; | |
1151 | else | |
1152 | ret = 0; | |
1153 | ||
1154 | xt_table_unlock(t); | |
1155 | module_put(t->me); | |
1156 | } else | |
1157 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1158 | #ifdef CONFIG_COMPAT | |
1159 | if (compat) | |
1160 | xt_compat_unlock(AF_INET); | |
1161 | #endif | |
1162 | return ret; | |
1163 | } | |
1164 | ||
1165 | static int | |
d5d1baa1 JE |
1166 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
1167 | const int *len) | |
2722971c DM |
1168 | { |
1169 | int ret; | |
1170 | struct ipt_get_entries get; | |
e60a13e0 | 1171 | struct xt_table *t; |
2722971c DM |
1172 | |
1173 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1174 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1175 | return -EINVAL; |
1176 | } | |
1177 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1178 | return -EFAULT; | |
1179 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1180 | duprintf("get_entries: %u != %zu\n", |
1181 | *len, sizeof(get) + get.size); | |
2722971c DM |
1182 | return -EINVAL; |
1183 | } | |
1184 | ||
34bd137b | 1185 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1186 | if (t && !IS_ERR(t)) { |
5452e425 | 1187 | const struct xt_table_info *private = t->private; |
9c547959 | 1188 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1189 | if (get.size == private->size) |
1190 | ret = copy_entries_to_user(private->size, | |
1191 | t, uptr->entrytable); | |
1192 | else { | |
1193 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1194 | private->size, get.size); |
544473c1 | 1195 | ret = -EAGAIN; |
2722971c DM |
1196 | } |
1197 | module_put(t->me); | |
1198 | xt_table_unlock(t); | |
1199 | } else | |
1200 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1201 | ||
1202 | return ret; | |
1203 | } | |
1204 | ||
1205 | static int | |
34bd137b | 1206 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1207 | struct xt_table_info *newinfo, unsigned int num_counters, |
1208 | void __user *counters_ptr) | |
2722971c DM |
1209 | { |
1210 | int ret; | |
e60a13e0 | 1211 | struct xt_table *t; |
2722971c DM |
1212 | struct xt_table_info *oldinfo; |
1213 | struct xt_counters *counters; | |
1214 | void *loc_cpu_old_entry; | |
72b2b1dd | 1215 | struct ipt_entry *iter; |
2722971c DM |
1216 | |
1217 | ret = 0; | |
1218 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); | |
1219 | if (!counters) { | |
1220 | ret = -ENOMEM; | |
1221 | goto out; | |
1222 | } | |
1223 | ||
34bd137b | 1224 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c DM |
1225 | "iptable_%s", name); |
1226 | if (!t || IS_ERR(t)) { | |
1227 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1228 | goto free_newinfo_counters_untrans; | |
1229 | } | |
1230 | ||
1231 | /* You lied! */ | |
1232 | if (valid_hooks != t->valid_hooks) { | |
1233 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1234 | valid_hooks, t->valid_hooks); | |
1235 | ret = -EINVAL; | |
1236 | goto put_module; | |
1237 | } | |
1238 | ||
1239 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1240 | if (!oldinfo) | |
1241 | goto put_module; | |
1242 | ||
1243 | /* Update module usage count based on number of rules */ | |
1244 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1245 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1246 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1247 | (newinfo->number <= oldinfo->initial_entries)) | |
1248 | module_put(t->me); | |
1249 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1250 | (newinfo->number <= oldinfo->initial_entries)) | |
1251 | module_put(t->me); | |
1252 | ||
942e4a2b | 1253 | /* Get the old counters, and synchronize with replace */ |
2722971c | 1254 | get_counters(oldinfo, counters); |
942e4a2b | 1255 | |
2722971c DM |
1256 | /* Decrease module usage counts and free resource */ |
1257 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
72b2b1dd | 1258 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1259 | cleanup_entry(iter, net); |
72b2b1dd | 1260 | |
2722971c DM |
1261 | xt_free_table_info(oldinfo); |
1262 | if (copy_to_user(counters_ptr, counters, | |
1263 | sizeof(struct xt_counters) * num_counters) != 0) | |
1264 | ret = -EFAULT; | |
1265 | vfree(counters); | |
1266 | xt_table_unlock(t); | |
1267 | return ret; | |
1268 | ||
1269 | put_module: | |
1270 | module_put(t->me); | |
1271 | xt_table_unlock(t); | |
1272 | free_newinfo_counters_untrans: | |
1273 | vfree(counters); | |
1274 | out: | |
1275 | return ret; | |
1276 | } | |
1277 | ||
1278 | static int | |
d5d1baa1 | 1279 | do_replace(struct net *net, const void __user *user, unsigned int len) |
2722971c DM |
1280 | { |
1281 | int ret; | |
1282 | struct ipt_replace tmp; | |
1283 | struct xt_table_info *newinfo; | |
1284 | void *loc_cpu_entry; | |
72b2b1dd | 1285 | struct ipt_entry *iter; |
2722971c DM |
1286 | |
1287 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1288 | return -EFAULT; | |
1289 | ||
2722971c | 1290 | /* overflow check */ |
2722971c DM |
1291 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1292 | return -ENOMEM; | |
1293 | ||
1294 | newinfo = xt_alloc_table_info(tmp.size); | |
1295 | if (!newinfo) | |
1296 | return -ENOMEM; | |
1297 | ||
9c547959 | 1298 | /* choose the copy that is on our node/cpu */ |
2722971c DM |
1299 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1300 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1301 | tmp.size) != 0) { | |
1302 | ret = -EFAULT; | |
1303 | goto free_newinfo; | |
1304 | } | |
1305 | ||
0f234214 | 1306 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
2722971c DM |
1307 | if (ret != 0) |
1308 | goto free_newinfo; | |
1309 | ||
ff67e4e4 | 1310 | duprintf("Translated table\n"); |
2722971c | 1311 | |
34bd137b | 1312 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1313 | tmp.num_counters, tmp.counters); |
2722971c DM |
1314 | if (ret) |
1315 | goto free_newinfo_untrans; | |
1316 | return 0; | |
1317 | ||
1318 | free_newinfo_untrans: | |
72b2b1dd | 1319 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1320 | cleanup_entry(iter, net); |
2722971c DM |
1321 | free_newinfo: |
1322 | xt_free_table_info(newinfo); | |
1323 | return ret; | |
1324 | } | |
1325 | ||
2722971c | 1326 | static int |
d5d1baa1 JE |
1327 | do_add_counters(struct net *net, const void __user *user, |
1328 | unsigned int len, int compat) | |
2722971c | 1329 | { |
942e4a2b | 1330 | unsigned int i, curcpu; |
2722971c DM |
1331 | struct xt_counters_info tmp; |
1332 | struct xt_counters *paddc; | |
1333 | unsigned int num_counters; | |
5452e425 | 1334 | const char *name; |
2722971c DM |
1335 | int size; |
1336 | void *ptmp; | |
e60a13e0 | 1337 | struct xt_table *t; |
5452e425 | 1338 | const struct xt_table_info *private; |
2722971c DM |
1339 | int ret = 0; |
1340 | void *loc_cpu_entry; | |
72b2b1dd | 1341 | struct ipt_entry *iter; |
2722971c DM |
1342 | #ifdef CONFIG_COMPAT |
1343 | struct compat_xt_counters_info compat_tmp; | |
1344 | ||
1345 | if (compat) { | |
1346 | ptmp = &compat_tmp; | |
1347 | size = sizeof(struct compat_xt_counters_info); | |
1348 | } else | |
1349 | #endif | |
1350 | { | |
1351 | ptmp = &tmp; | |
1352 | size = sizeof(struct xt_counters_info); | |
1353 | } | |
1354 | ||
1355 | if (copy_from_user(ptmp, user, size) != 0) | |
1356 | return -EFAULT; | |
1357 | ||
1358 | #ifdef CONFIG_COMPAT | |
1359 | if (compat) { | |
1360 | num_counters = compat_tmp.num_counters; | |
1361 | name = compat_tmp.name; | |
1362 | } else | |
1363 | #endif | |
1364 | { | |
1365 | num_counters = tmp.num_counters; | |
1366 | name = tmp.name; | |
1367 | } | |
1368 | ||
1369 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1370 | return -EINVAL; | |
1371 | ||
1372 | paddc = vmalloc_node(len - size, numa_node_id()); | |
1373 | if (!paddc) | |
1374 | return -ENOMEM; | |
1375 | ||
1376 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1377 | ret = -EFAULT; | |
1378 | goto free; | |
1379 | } | |
1380 | ||
34bd137b | 1381 | t = xt_find_table_lock(net, AF_INET, name); |
2722971c DM |
1382 | if (!t || IS_ERR(t)) { |
1383 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1384 | goto free; | |
1385 | } | |
1386 | ||
942e4a2b | 1387 | local_bh_disable(); |
2722971c DM |
1388 | private = t->private; |
1389 | if (private->number != num_counters) { | |
1390 | ret = -EINVAL; | |
1391 | goto unlock_up_free; | |
1392 | } | |
1393 | ||
1394 | i = 0; | |
1395 | /* Choose the copy that is on our node */ | |
942e4a2b SH |
1396 | curcpu = smp_processor_id(); |
1397 | loc_cpu_entry = private->entries[curcpu]; | |
1398 | xt_info_wrlock(curcpu); | |
0559518b JE |
1399 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
1400 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); | |
1401 | ++i; | |
1402 | } | |
942e4a2b | 1403 | xt_info_wrunlock(curcpu); |
2722971c | 1404 | unlock_up_free: |
942e4a2b | 1405 | local_bh_enable(); |
2722971c DM |
1406 | xt_table_unlock(t); |
1407 | module_put(t->me); | |
1408 | free: | |
1409 | vfree(paddc); | |
1410 | ||
1411 | return ret; | |
1412 | } | |
1413 | ||
1414 | #ifdef CONFIG_COMPAT | |
1415 | struct compat_ipt_replace { | |
1416 | char name[IPT_TABLE_MAXNAMELEN]; | |
1417 | u32 valid_hooks; | |
1418 | u32 num_entries; | |
1419 | u32 size; | |
6e23ae2a PM |
1420 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1421 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c DM |
1422 | u32 num_counters; |
1423 | compat_uptr_t counters; /* struct ipt_counters * */ | |
1424 | struct compat_ipt_entry entries[0]; | |
1425 | }; | |
1426 | ||
a18aa31b PM |
1427 | static int |
1428 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1429 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1430 | unsigned int i) |
2722971c | 1431 | { |
3e597c60 | 1432 | struct ipt_entry_target *t; |
2722971c DM |
1433 | struct compat_ipt_entry __user *ce; |
1434 | u_int16_t target_offset, next_offset; | |
1435 | compat_uint_t origsize; | |
dcea992a JE |
1436 | const struct xt_entry_match *ematch; |
1437 | int ret = 0; | |
2722971c | 1438 | |
2722971c DM |
1439 | origsize = *size; |
1440 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
0559518b JE |
1441 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
1442 | copy_to_user(&ce->counters, &counters[i], | |
1443 | sizeof(counters[i])) != 0) | |
1444 | return -EFAULT; | |
a18aa31b | 1445 | |
2722971c | 1446 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1447 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1448 | ||
dcea992a JE |
1449 | xt_ematch_foreach(ematch, e) { |
1450 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1451 | if (ret != 0) | |
6bdb331b | 1452 | return ret; |
dcea992a | 1453 | } |
2722971c | 1454 | target_offset = e->target_offset - (origsize - *size); |
2722971c | 1455 | t = ipt_get_target(e); |
9fa492cd | 1456 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c | 1457 | if (ret) |
0559518b | 1458 | return ret; |
2722971c | 1459 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1460 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1461 | put_user(next_offset, &ce->next_offset) != 0) | |
1462 | return -EFAULT; | |
2722971c | 1463 | return 0; |
2722971c DM |
1464 | } |
1465 | ||
022748a9 | 1466 | static int |
4c1b52bc | 1467 | compat_find_calc_match(struct ipt_entry_match *m, |
4b478248 PM |
1468 | const char *name, |
1469 | const struct ipt_ip *ip, | |
1470 | unsigned int hookmask, | |
6bdb331b | 1471 | int *size) |
2722971c | 1472 | { |
6709dbbb | 1473 | struct xt_match *match; |
2722971c DM |
1474 | |
1475 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, | |
4b478248 | 1476 | m->u.user.revision), |
2722971c DM |
1477 | "ipt_%s", m->u.user.name); |
1478 | if (IS_ERR(match) || !match) { | |
1479 | duprintf("compat_check_calc_match: `%s' not found\n", | |
4b478248 | 1480 | m->u.user.name); |
2722971c DM |
1481 | return match ? PTR_ERR(match) : -ENOENT; |
1482 | } | |
1483 | m->u.kernel.match = match; | |
9fa492cd | 1484 | *size += xt_compat_match_offset(match); |
4c1b52bc DM |
1485 | return 0; |
1486 | } | |
1487 | ||
0559518b | 1488 | static void compat_release_entry(struct compat_ipt_entry *e) |
4c1b52bc DM |
1489 | { |
1490 | struct ipt_entry_target *t; | |
dcea992a | 1491 | struct xt_entry_match *ematch; |
4c1b52bc | 1492 | |
4c1b52bc | 1493 | /* Cleanup all matches */ |
dcea992a | 1494 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1495 | module_put(ematch->u.kernel.match->me); |
73cd598d | 1496 | t = compat_ipt_get_target(e); |
4c1b52bc | 1497 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1498 | } |
1499 | ||
022748a9 | 1500 | static int |
73cd598d | 1501 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1502 | struct xt_table_info *newinfo, |
1503 | unsigned int *size, | |
d5d1baa1 JE |
1504 | const unsigned char *base, |
1505 | const unsigned char *limit, | |
1506 | const unsigned int *hook_entries, | |
1507 | const unsigned int *underflows, | |
4b478248 | 1508 | const char *name) |
2722971c | 1509 | { |
dcea992a | 1510 | struct xt_entry_match *ematch; |
2722971c | 1511 | struct ipt_entry_target *t; |
6709dbbb | 1512 | struct xt_target *target; |
e5b5ef7d | 1513 | unsigned int entry_offset; |
b0a6363c PM |
1514 | unsigned int j; |
1515 | int ret, off, h; | |
2722971c DM |
1516 | |
1517 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1518 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
1519 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { | |
2722971c DM |
1520 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1521 | return -EINVAL; | |
1522 | } | |
1523 | ||
1524 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1525 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1526 | duprintf("checking: element %p size %u\n", |
1527 | e, e->next_offset); | |
1528 | return -EINVAL; | |
1529 | } | |
1530 | ||
73cd598d PM |
1531 | /* For purposes of check_entry casting the compat entry is fine */ |
1532 | ret = check_entry((struct ipt_entry *)e, name); | |
a96be246 DM |
1533 | if (ret) |
1534 | return ret; | |
590bdf7f | 1535 | |
30c08c41 | 1536 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1537 | entry_offset = (void *)e - (void *)base; |
1538 | j = 0; | |
dcea992a JE |
1539 | xt_ematch_foreach(ematch, e) { |
1540 | ret = compat_find_calc_match(ematch, name, | |
6b4ff2d7 | 1541 | &e->ip, e->comefrom, &off); |
dcea992a | 1542 | if (ret != 0) |
6bdb331b JE |
1543 | goto release_matches; |
1544 | ++j; | |
dcea992a | 1545 | } |
2722971c | 1546 | |
73cd598d | 1547 | t = compat_ipt_get_target(e); |
d2a7b6ba JE |
1548 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
1549 | t->u.user.revision); | |
1550 | if (IS_ERR(target)) { | |
a96be246 | 1551 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1552 | t->u.user.name); |
d2a7b6ba | 1553 | ret = PTR_ERR(target); |
4c1b52bc | 1554 | goto release_matches; |
2722971c DM |
1555 | } |
1556 | t->u.kernel.target = target; | |
1557 | ||
9fa492cd | 1558 | off += xt_compat_target_offset(target); |
2722971c | 1559 | *size += off; |
b386d9f5 | 1560 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1561 | if (ret) |
1562 | goto out; | |
1563 | ||
1564 | /* Check hooks & underflows */ | |
6e23ae2a | 1565 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1566 | if ((unsigned char *)e - base == hook_entries[h]) |
1567 | newinfo->hook_entry[h] = hook_entries[h]; | |
1568 | if ((unsigned char *)e - base == underflows[h]) | |
1569 | newinfo->underflow[h] = underflows[h]; | |
1570 | } | |
1571 | ||
1572 | /* Clear counters and comefrom */ | |
73cd598d | 1573 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c | 1574 | e->comefrom = 0; |
2722971c | 1575 | return 0; |
bec71b16 | 1576 | |
2722971c | 1577 | out: |
bec71b16 | 1578 | module_put(t->u.kernel.target->me); |
4c1b52bc | 1579 | release_matches: |
6bdb331b JE |
1580 | xt_ematch_foreach(ematch, e) { |
1581 | if (j-- == 0) | |
dcea992a | 1582 | break; |
6bdb331b JE |
1583 | module_put(ematch->u.kernel.match->me); |
1584 | } | |
2722971c DM |
1585 | return ret; |
1586 | } | |
1587 | ||
4b478248 | 1588 | static int |
73cd598d | 1589 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1590 | unsigned int *size, const char *name, |
1591 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c DM |
1592 | { |
1593 | struct ipt_entry_target *t; | |
6709dbbb | 1594 | struct xt_target *target; |
2722971c DM |
1595 | struct ipt_entry *de; |
1596 | unsigned int origsize; | |
920b868a | 1597 | int ret, h; |
dcea992a | 1598 | struct xt_entry_match *ematch; |
2722971c DM |
1599 | |
1600 | ret = 0; | |
1601 | origsize = *size; | |
1602 | de = (struct ipt_entry *)*dstptr; | |
1603 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1604 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1605 | |
73cd598d | 1606 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1607 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1608 | ||
dcea992a JE |
1609 | xt_ematch_foreach(ematch, e) { |
1610 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1611 | if (ret != 0) | |
6bdb331b | 1612 | return ret; |
dcea992a | 1613 | } |
2722971c | 1614 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1615 | t = compat_ipt_get_target(e); |
2722971c | 1616 | target = t->u.kernel.target; |
9fa492cd | 1617 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1618 | |
1619 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1620 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1621 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1622 | newinfo->hook_entry[h] -= origsize - *size; | |
1623 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1624 | newinfo->underflow[h] -= origsize - *size; | |
1625 | } | |
f6677f43 DM |
1626 | return ret; |
1627 | } | |
1628 | ||
022748a9 | 1629 | static int |
0559518b | 1630 | compat_check_entry(struct ipt_entry *e, struct net *net, const char *name) |
f6677f43 | 1631 | { |
dcea992a | 1632 | struct xt_entry_match *ematch; |
9b4fce7a | 1633 | struct xt_mtchk_param mtpar; |
b0a6363c | 1634 | unsigned int j; |
dcea992a | 1635 | int ret = 0; |
f6677f43 | 1636 | |
4c1b52bc | 1637 | j = 0; |
a83d8e8d | 1638 | mtpar.net = net; |
9b4fce7a JE |
1639 | mtpar.table = name; |
1640 | mtpar.entryinfo = &e->ip; | |
1641 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1642 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 1643 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1644 | ret = check_match(ematch, &mtpar); |
dcea992a | 1645 | if (ret != 0) |
6bdb331b JE |
1646 | goto cleanup_matches; |
1647 | ++j; | |
dcea992a | 1648 | } |
4c1b52bc | 1649 | |
add67461 | 1650 | ret = check_target(e, net, name); |
4c1b52bc DM |
1651 | if (ret) |
1652 | goto cleanup_matches; | |
4c1b52bc DM |
1653 | return 0; |
1654 | ||
1655 | cleanup_matches: | |
6bdb331b JE |
1656 | xt_ematch_foreach(ematch, e) { |
1657 | if (j-- == 0) | |
dcea992a | 1658 | break; |
6bdb331b JE |
1659 | cleanup_match(ematch, net); |
1660 | } | |
4c1b52bc | 1661 | return ret; |
f6677f43 DM |
1662 | } |
1663 | ||
1da177e4 | 1664 | static int |
a83d8e8d AD |
1665 | translate_compat_table(struct net *net, |
1666 | const char *name, | |
4b478248 PM |
1667 | unsigned int valid_hooks, |
1668 | struct xt_table_info **pinfo, | |
1669 | void **pentry0, | |
1670 | unsigned int total_size, | |
1671 | unsigned int number, | |
1672 | unsigned int *hook_entries, | |
1673 | unsigned int *underflows) | |
1da177e4 | 1674 | { |
920b868a | 1675 | unsigned int i, j; |
2722971c DM |
1676 | struct xt_table_info *newinfo, *info; |
1677 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1678 | struct compat_ipt_entry *iter0; |
1679 | struct ipt_entry *iter1; | |
2722971c | 1680 | unsigned int size; |
0559518b | 1681 | int ret; |
1da177e4 | 1682 | |
2722971c DM |
1683 | info = *pinfo; |
1684 | entry0 = *pentry0; | |
1685 | size = total_size; | |
1686 | info->number = number; | |
1687 | ||
1688 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1689 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1690 | info->hook_entry[i] = 0xFFFFFFFF; |
1691 | info->underflow[i] = 0xFFFFFFFF; | |
1692 | } | |
1693 | ||
1694 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1695 | j = 0; |
2722971c DM |
1696 | xt_compat_lock(AF_INET); |
1697 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
1698 | xt_entry_foreach(iter0, entry0, total_size) { |
1699 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1700 | entry0, |
1701 | entry0 + total_size, | |
1702 | hook_entries, | |
1703 | underflows, | |
1704 | name); | |
72b2b1dd | 1705 | if (ret != 0) |
0559518b JE |
1706 | goto out_unlock; |
1707 | ++j; | |
72b2b1dd | 1708 | } |
2722971c DM |
1709 | |
1710 | ret = -EINVAL; | |
920b868a | 1711 | if (j != number) { |
2722971c | 1712 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1713 | j, number); |
2722971c DM |
1714 | goto out_unlock; |
1715 | } | |
1716 | ||
1717 | /* Check hooks all assigned */ | |
6e23ae2a | 1718 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1719 | /* Only hooks which are valid */ |
1720 | if (!(valid_hooks & (1 << i))) | |
1721 | continue; | |
1722 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1723 | duprintf("Invalid hook entry %u %u\n", | |
1724 | i, hook_entries[i]); | |
1725 | goto out_unlock; | |
1da177e4 | 1726 | } |
2722971c DM |
1727 | if (info->underflow[i] == 0xFFFFFFFF) { |
1728 | duprintf("Invalid underflow %u %u\n", | |
1729 | i, underflows[i]); | |
1730 | goto out_unlock; | |
1731 | } | |
1732 | } | |
1733 | ||
1734 | ret = -ENOMEM; | |
1735 | newinfo = xt_alloc_table_info(size); | |
1736 | if (!newinfo) | |
1737 | goto out_unlock; | |
1738 | ||
1739 | newinfo->number = number; | |
6e23ae2a | 1740 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1741 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1742 | newinfo->underflow[i] = info->underflow[i]; | |
1743 | } | |
1744 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1745 | pos = entry1; | |
4b478248 | 1746 | size = total_size; |
72b2b1dd | 1747 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1748 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1749 | name, newinfo, entry1); | |
72b2b1dd JE |
1750 | if (ret != 0) |
1751 | break; | |
1752 | } | |
b386d9f5 | 1753 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1754 | xt_compat_unlock(AF_INET); |
1755 | if (ret) | |
1756 | goto free_newinfo; | |
1757 | ||
1758 | ret = -ELOOP; | |
1759 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1760 | goto free_newinfo; | |
1761 | ||
4c1b52bc | 1762 | i = 0; |
72b2b1dd | 1763 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1764 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1765 | if (ret != 0) |
1766 | break; | |
0559518b | 1767 | ++i; |
72b2b1dd | 1768 | } |
4c1b52bc | 1769 | if (ret) { |
72b2b1dd JE |
1770 | /* |
1771 | * The first i matches need cleanup_entry (calls ->destroy) | |
1772 | * because they had called ->check already. The other j-i | |
1773 | * entries need only release. | |
1774 | */ | |
1775 | int skip = i; | |
4c1b52bc | 1776 | j -= i; |
72b2b1dd JE |
1777 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1778 | if (skip-- > 0) | |
1779 | continue; | |
0559518b | 1780 | if (j-- == 0) |
72b2b1dd | 1781 | break; |
0559518b | 1782 | compat_release_entry(iter0); |
72b2b1dd | 1783 | } |
0559518b JE |
1784 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1785 | if (i-- == 0) | |
72b2b1dd | 1786 | break; |
0559518b JE |
1787 | cleanup_entry(iter1, net); |
1788 | } | |
4c1b52bc DM |
1789 | xt_free_table_info(newinfo); |
1790 | return ret; | |
1791 | } | |
f6677f43 | 1792 | |
2722971c | 1793 | /* And one copy for every other CPU */ |
fb1bb34d | 1794 | for_each_possible_cpu(i) |
2722971c DM |
1795 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1796 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1797 | ||
1798 | *pinfo = newinfo; | |
1799 | *pentry0 = entry1; | |
1800 | xt_free_table_info(info); | |
1801 | return 0; | |
1da177e4 | 1802 | |
2722971c DM |
1803 | free_newinfo: |
1804 | xt_free_table_info(newinfo); | |
1805 | out: | |
0559518b JE |
1806 | xt_entry_foreach(iter0, entry0, total_size) { |
1807 | if (j-- == 0) | |
72b2b1dd | 1808 | break; |
0559518b JE |
1809 | compat_release_entry(iter0); |
1810 | } | |
1da177e4 | 1811 | return ret; |
2722971c | 1812 | out_unlock: |
b386d9f5 | 1813 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1814 | xt_compat_unlock(AF_INET); |
1815 | goto out; | |
1da177e4 LT |
1816 | } |
1817 | ||
1818 | static int | |
34bd137b | 1819 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1820 | { |
1821 | int ret; | |
2722971c DM |
1822 | struct compat_ipt_replace tmp; |
1823 | struct xt_table_info *newinfo; | |
1824 | void *loc_cpu_entry; | |
72b2b1dd | 1825 | struct ipt_entry *iter; |
1da177e4 LT |
1826 | |
1827 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1828 | return -EFAULT; | |
1829 | ||
ee4bb818 | 1830 | /* overflow check */ |
259d4e41 | 1831 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1832 | return -ENOMEM; |
1833 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1834 | return -ENOMEM; | |
1835 | ||
2e4e6a17 | 1836 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1837 | if (!newinfo) |
1838 | return -ENOMEM; | |
1839 | ||
9c547959 | 1840 | /* choose the copy that is on our node/cpu */ |
31836064 ED |
1841 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1842 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1843 | tmp.size) != 0) { |
1844 | ret = -EFAULT; | |
1845 | goto free_newinfo; | |
1846 | } | |
1847 | ||
a83d8e8d | 1848 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
4b478248 PM |
1849 | &newinfo, &loc_cpu_entry, tmp.size, |
1850 | tmp.num_entries, tmp.hook_entry, | |
1851 | tmp.underflow); | |
2722971c | 1852 | if (ret != 0) |
1da177e4 | 1853 | goto free_newinfo; |
1da177e4 | 1854 | |
2722971c | 1855 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1856 | |
34bd137b | 1857 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1858 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1859 | if (ret) |
1860 | goto free_newinfo_untrans; | |
1861 | return 0; | |
1da177e4 | 1862 | |
2722971c | 1863 | free_newinfo_untrans: |
72b2b1dd | 1864 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1865 | cleanup_entry(iter, net); |
2722971c DM |
1866 | free_newinfo: |
1867 | xt_free_table_info(newinfo); | |
1868 | return ret; | |
1869 | } | |
1da177e4 | 1870 | |
2722971c DM |
1871 | static int |
1872 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1873 | unsigned int len) |
2722971c DM |
1874 | { |
1875 | int ret; | |
1da177e4 | 1876 | |
2722971c DM |
1877 | if (!capable(CAP_NET_ADMIN)) |
1878 | return -EPERM; | |
1da177e4 | 1879 | |
2722971c DM |
1880 | switch (cmd) { |
1881 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1882 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1883 | break; |
1da177e4 | 1884 | |
2722971c | 1885 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1886 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1887 | break; |
1888 | ||
1889 | default: | |
1890 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1891 | ret = -EINVAL; | |
1892 | } | |
1da177e4 | 1893 | |
1da177e4 LT |
1894 | return ret; |
1895 | } | |
1896 | ||
4b478248 | 1897 | struct compat_ipt_get_entries { |
2722971c DM |
1898 | char name[IPT_TABLE_MAXNAMELEN]; |
1899 | compat_uint_t size; | |
1900 | struct compat_ipt_entry entrytable[0]; | |
1901 | }; | |
1da177e4 | 1902 | |
4b478248 PM |
1903 | static int |
1904 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1905 | void __user *userptr) | |
2722971c | 1906 | { |
2722971c | 1907 | struct xt_counters *counters; |
5452e425 | 1908 | const struct xt_table_info *private = table->private; |
2722971c DM |
1909 | void __user *pos; |
1910 | unsigned int size; | |
1911 | int ret = 0; | |
5452e425 | 1912 | const void *loc_cpu_entry; |
a18aa31b | 1913 | unsigned int i = 0; |
72b2b1dd | 1914 | struct ipt_entry *iter; |
1da177e4 | 1915 | |
2722971c DM |
1916 | counters = alloc_counters(table); |
1917 | if (IS_ERR(counters)) | |
1918 | return PTR_ERR(counters); | |
1919 | ||
1920 | /* choose the copy that is on our node/cpu, ... | |
1921 | * This choice is lazy (because current thread is | |
1922 | * allowed to migrate to another cpu) | |
1923 | */ | |
1924 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1925 | pos = userptr; | |
1926 | size = total_size; | |
72b2b1dd JE |
1927 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
1928 | ret = compat_copy_entry_to_user(iter, &pos, | |
6b4ff2d7 | 1929 | &size, counters, i++); |
72b2b1dd JE |
1930 | if (ret != 0) |
1931 | break; | |
1932 | } | |
2722971c | 1933 | |
2722971c DM |
1934 | vfree(counters); |
1935 | return ret; | |
1da177e4 LT |
1936 | } |
1937 | ||
1938 | static int | |
34bd137b AD |
1939 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1940 | int *len) | |
1da177e4 | 1941 | { |
2722971c DM |
1942 | int ret; |
1943 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1944 | struct xt_table *t; |
1da177e4 | 1945 | |
2722971c | 1946 | if (*len < sizeof(get)) { |
c9d8fe13 | 1947 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1948 | return -EINVAL; |
2722971c | 1949 | } |
1da177e4 | 1950 | |
2722971c DM |
1951 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1952 | return -EFAULT; | |
1da177e4 | 1953 | |
2722971c | 1954 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1955 | duprintf("compat_get_entries: %u != %zu\n", |
1956 | *len, sizeof(get) + get.size); | |
2722971c | 1957 | return -EINVAL; |
1da177e4 LT |
1958 | } |
1959 | ||
2722971c | 1960 | xt_compat_lock(AF_INET); |
34bd137b | 1961 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1962 | if (t && !IS_ERR(t)) { |
5452e425 | 1963 | const struct xt_table_info *private = t->private; |
2722971c | 1964 | struct xt_table_info info; |
9c547959 | 1965 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1966 | ret = compat_table_info(private, &info); |
1967 | if (!ret && get.size == info.size) { | |
1968 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 1969 | t, uptr->entrytable); |
2722971c DM |
1970 | } else if (!ret) { |
1971 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1972 | private->size, get.size); |
544473c1 | 1973 | ret = -EAGAIN; |
2722971c | 1974 | } |
b386d9f5 | 1975 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1976 | module_put(t->me); |
1977 | xt_table_unlock(t); | |
1978 | } else | |
1da177e4 | 1979 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1980 | |
2722971c DM |
1981 | xt_compat_unlock(AF_INET); |
1982 | return ret; | |
1983 | } | |
1da177e4 | 1984 | |
79030ed0 PM |
1985 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1986 | ||
2722971c DM |
1987 | static int |
1988 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1989 | { | |
1990 | int ret; | |
1da177e4 | 1991 | |
82fac054 BS |
1992 | if (!capable(CAP_NET_ADMIN)) |
1993 | return -EPERM; | |
1994 | ||
2722971c DM |
1995 | switch (cmd) { |
1996 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1997 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1998 | break; |
1999 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 2000 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
2001 | break; |
2002 | default: | |
79030ed0 | 2003 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 2004 | } |
1da177e4 LT |
2005 | return ret; |
2006 | } | |
2722971c | 2007 | #endif |
1da177e4 LT |
2008 | |
2009 | static int | |
9c547959 | 2010 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
2011 | { |
2012 | int ret; | |
2013 | ||
2014 | if (!capable(CAP_NET_ADMIN)) | |
2015 | return -EPERM; | |
2016 | ||
2017 | switch (cmd) { | |
2018 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 2019 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2020 | break; |
2021 | ||
2022 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2023 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2024 | break; |
2025 | ||
2026 | default: | |
2027 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
2028 | ret = -EINVAL; | |
2029 | } | |
2030 | ||
2031 | return ret; | |
2032 | } | |
2033 | ||
2034 | static int | |
2035 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2036 | { | |
2037 | int ret; | |
2038 | ||
2039 | if (!capable(CAP_NET_ADMIN)) | |
2040 | return -EPERM; | |
2041 | ||
2042 | switch (cmd) { | |
2722971c | 2043 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2044 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2045 | break; |
1da177e4 | 2046 | |
2722971c | 2047 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2048 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2049 | break; |
1da177e4 LT |
2050 | |
2051 | case IPT_SO_GET_REVISION_MATCH: | |
2052 | case IPT_SO_GET_REVISION_TARGET: { | |
2053 | struct ipt_get_revision rev; | |
2e4e6a17 | 2054 | int target; |
1da177e4 LT |
2055 | |
2056 | if (*len != sizeof(rev)) { | |
2057 | ret = -EINVAL; | |
2058 | break; | |
2059 | } | |
2060 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2061 | ret = -EFAULT; | |
2062 | break; | |
2063 | } | |
2064 | ||
2065 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2066 | target = 1; |
1da177e4 | 2067 | else |
2e4e6a17 | 2068 | target = 0; |
1da177e4 | 2069 | |
2e4e6a17 HW |
2070 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2071 | rev.revision, | |
2072 | target, &ret), | |
1da177e4 LT |
2073 | "ipt_%s", rev.name); |
2074 | break; | |
2075 | } | |
2076 | ||
2077 | default: | |
2078 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2079 | ret = -EINVAL; | |
2080 | } | |
2081 | ||
2082 | return ret; | |
2083 | } | |
2084 | ||
35aad0ff JE |
2085 | struct xt_table *ipt_register_table(struct net *net, |
2086 | const struct xt_table *table, | |
44d34e72 | 2087 | const struct ipt_replace *repl) |
1da177e4 LT |
2088 | { |
2089 | int ret; | |
2e4e6a17 | 2090 | struct xt_table_info *newinfo; |
259d4e41 | 2091 | struct xt_table_info bootstrap |
1da177e4 | 2092 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2093 | void *loc_cpu_entry; |
a98da11d | 2094 | struct xt_table *new_table; |
1da177e4 | 2095 | |
2e4e6a17 | 2096 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2097 | if (!newinfo) { |
2098 | ret = -ENOMEM; | |
2099 | goto out; | |
2100 | } | |
1da177e4 | 2101 | |
9c547959 | 2102 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2103 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2104 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 | 2105 | |
0f234214 | 2106 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2107 | if (ret != 0) |
2108 | goto out_free; | |
1da177e4 | 2109 | |
44d34e72 | 2110 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2111 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2112 | ret = PTR_ERR(new_table); |
2113 | goto out_free; | |
1da177e4 LT |
2114 | } |
2115 | ||
44d34e72 AD |
2116 | return new_table; |
2117 | ||
2118 | out_free: | |
2119 | xt_free_table_info(newinfo); | |
2120 | out: | |
2121 | return ERR_PTR(ret); | |
1da177e4 LT |
2122 | } |
2123 | ||
f54e9367 | 2124 | void ipt_unregister_table(struct net *net, struct xt_table *table) |
1da177e4 | 2125 | { |
2e4e6a17 | 2126 | struct xt_table_info *private; |
31836064 | 2127 | void *loc_cpu_entry; |
df200969 | 2128 | struct module *table_owner = table->me; |
72b2b1dd | 2129 | struct ipt_entry *iter; |
31836064 | 2130 | |
e905a9ed | 2131 | private = xt_unregister_table(table); |
1da177e4 LT |
2132 | |
2133 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 | 2134 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
72b2b1dd | 2135 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 2136 | cleanup_entry(iter, net); |
df200969 AD |
2137 | if (private->number > private->initial_entries) |
2138 | module_put(table_owner); | |
2e4e6a17 | 2139 | xt_free_table_info(private); |
1da177e4 LT |
2140 | } |
2141 | ||
2142 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2143 | static inline bool |
1da177e4 LT |
2144 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2145 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2146 | bool invert) |
1da177e4 | 2147 | { |
9c547959 PM |
2148 | return ((test_type == 0xFF) || |
2149 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2150 | ^ invert; |
2151 | } | |
2152 | ||
1d93a9cb | 2153 | static bool |
f7108a20 | 2154 | icmp_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2155 | { |
5452e425 JE |
2156 | const struct icmphdr *ic; |
2157 | struct icmphdr _icmph; | |
f7108a20 | 2158 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2159 | |
2160 | /* Must not be a fragment. */ | |
f7108a20 | 2161 | if (par->fragoff != 0) |
1d93a9cb | 2162 | return false; |
1da177e4 | 2163 | |
f7108a20 | 2164 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2165 | if (ic == NULL) { |
2166 | /* We've been asked to examine this packet, and we | |
2167 | * can't. Hence, no choice but to drop. | |
2168 | */ | |
2169 | duprintf("Dropping evil ICMP tinygram.\n"); | |
f7108a20 | 2170 | *par->hotdrop = true; |
1d93a9cb | 2171 | return false; |
1da177e4 LT |
2172 | } |
2173 | ||
2174 | return icmp_type_code_match(icmpinfo->type, | |
2175 | icmpinfo->code[0], | |
2176 | icmpinfo->code[1], | |
2177 | ic->type, ic->code, | |
2178 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2179 | } | |
2180 | ||
9b4fce7a | 2181 | static bool icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2182 | { |
9b4fce7a | 2183 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2184 | |
1d5cd909 PM |
2185 | /* Must specify no unknown invflags */ |
2186 | return !(icmpinfo->invflags & ~IPT_ICMP_INV); | |
1da177e4 LT |
2187 | } |
2188 | ||
2189 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2190 | static struct xt_target ipt_standard_target __read_mostly = { |
1da177e4 | 2191 | .name = IPT_STANDARD_TARGET, |
1d5cd909 | 2192 | .targetsize = sizeof(int), |
4ba351cf | 2193 | .family = NFPROTO_IPV4, |
2722971c | 2194 | #ifdef CONFIG_COMPAT |
9fa492cd PM |
2195 | .compatsize = sizeof(compat_int_t), |
2196 | .compat_from_user = compat_standard_from_user, | |
2197 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2198 | #endif |
1da177e4 LT |
2199 | }; |
2200 | ||
9f15c530 | 2201 | static struct xt_target ipt_error_target __read_mostly = { |
1da177e4 LT |
2202 | .name = IPT_ERROR_TARGET, |
2203 | .target = ipt_error, | |
1d5cd909 | 2204 | .targetsize = IPT_FUNCTION_MAXNAMELEN, |
4ba351cf | 2205 | .family = NFPROTO_IPV4, |
1da177e4 LT |
2206 | }; |
2207 | ||
2208 | static struct nf_sockopt_ops ipt_sockopts = { | |
2209 | .pf = PF_INET, | |
2210 | .set_optmin = IPT_BASE_CTL, | |
2211 | .set_optmax = IPT_SO_SET_MAX+1, | |
2212 | .set = do_ipt_set_ctl, | |
2722971c DM |
2213 | #ifdef CONFIG_COMPAT |
2214 | .compat_set = compat_do_ipt_set_ctl, | |
2215 | #endif | |
1da177e4 LT |
2216 | .get_optmin = IPT_BASE_CTL, |
2217 | .get_optmax = IPT_SO_GET_MAX+1, | |
2218 | .get = do_ipt_get_ctl, | |
2722971c DM |
2219 | #ifdef CONFIG_COMPAT |
2220 | .compat_get = compat_do_ipt_get_ctl, | |
2221 | #endif | |
16fcec35 | 2222 | .owner = THIS_MODULE, |
1da177e4 LT |
2223 | }; |
2224 | ||
9f15c530 | 2225 | static struct xt_match icmp_matchstruct __read_mostly = { |
1da177e4 | 2226 | .name = "icmp", |
1d5cd909 PM |
2227 | .match = icmp_match, |
2228 | .matchsize = sizeof(struct ipt_icmp), | |
9c547959 | 2229 | .checkentry = icmp_checkentry, |
1d5cd909 | 2230 | .proto = IPPROTO_ICMP, |
4ba351cf | 2231 | .family = NFPROTO_IPV4, |
1da177e4 LT |
2232 | }; |
2233 | ||
3cb609d5 AD |
2234 | static int __net_init ip_tables_net_init(struct net *net) |
2235 | { | |
383ca5b8 | 2236 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
2237 | } |
2238 | ||
2239 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2240 | { | |
383ca5b8 | 2241 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
2242 | } |
2243 | ||
2244 | static struct pernet_operations ip_tables_net_ops = { | |
2245 | .init = ip_tables_net_init, | |
2246 | .exit = ip_tables_net_exit, | |
2247 | }; | |
2248 | ||
65b4b4e8 | 2249 | static int __init ip_tables_init(void) |
1da177e4 LT |
2250 | { |
2251 | int ret; | |
2252 | ||
3cb609d5 | 2253 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2254 | if (ret < 0) |
2255 | goto err1; | |
2e4e6a17 | 2256 | |
1da177e4 | 2257 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2258 | ret = xt_register_target(&ipt_standard_target); |
2259 | if (ret < 0) | |
2260 | goto err2; | |
2261 | ret = xt_register_target(&ipt_error_target); | |
2262 | if (ret < 0) | |
2263 | goto err3; | |
2264 | ret = xt_register_match(&icmp_matchstruct); | |
2265 | if (ret < 0) | |
2266 | goto err4; | |
1da177e4 LT |
2267 | |
2268 | /* Register setsockopt */ | |
2269 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2270 | if (ret < 0) |
2271 | goto err5; | |
1da177e4 | 2272 | |
ff67e4e4 | 2273 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2274 | return 0; |
0eff66e6 PM |
2275 | |
2276 | err5: | |
2277 | xt_unregister_match(&icmp_matchstruct); | |
2278 | err4: | |
2279 | xt_unregister_target(&ipt_error_target); | |
2280 | err3: | |
2281 | xt_unregister_target(&ipt_standard_target); | |
2282 | err2: | |
3cb609d5 | 2283 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2284 | err1: |
2285 | return ret; | |
1da177e4 LT |
2286 | } |
2287 | ||
65b4b4e8 | 2288 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2289 | { |
2290 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2291 | |
a45049c5 PNA |
2292 | xt_unregister_match(&icmp_matchstruct); |
2293 | xt_unregister_target(&ipt_error_target); | |
2294 | xt_unregister_target(&ipt_standard_target); | |
2e4e6a17 | 2295 | |
3cb609d5 | 2296 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2297 | } |
2298 | ||
2299 | EXPORT_SYMBOL(ipt_register_table); | |
2300 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2301 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2302 | module_init(ip_tables_init); |
2303 | module_exit(ip_tables_fini); |