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 | */ |
1da177e4 | 11 | #include <linux/cache.h> |
4fc268d2 | 12 | #include <linux/capability.h> |
1da177e4 LT |
13 | #include <linux/skbuff.h> |
14 | #include <linux/kmod.h> | |
15 | #include <linux/vmalloc.h> | |
16 | #include <linux/netdevice.h> | |
17 | #include <linux/module.h> | |
1da177e4 LT |
18 | #include <linux/icmp.h> |
19 | #include <net/ip.h> | |
2722971c | 20 | #include <net/compat.h> |
1da177e4 | 21 | #include <asm/uaccess.h> |
57b47a53 | 22 | #include <linux/mutex.h> |
1da177e4 LT |
23 | #include <linux/proc_fs.h> |
24 | #include <linux/err.h> | |
c8923c6b | 25 | #include <linux/cpumask.h> |
1da177e4 | 26 | |
2e4e6a17 | 27 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 28 | #include <linux/netfilter_ipv4/ip_tables.h> |
f01ffbd6 | 29 | #include <net/netfilter/nf_log.h> |
1da177e4 LT |
30 | |
31 | MODULE_LICENSE("GPL"); | |
32 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
33 | MODULE_DESCRIPTION("IPv4 packet filter"); | |
34 | ||
35 | /*#define DEBUG_IP_FIREWALL*/ | |
36 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
37 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
38 | ||
39 | #ifdef DEBUG_IP_FIREWALL | |
40 | #define dprintf(format, args...) printk(format , ## args) | |
41 | #else | |
42 | #define dprintf(format, args...) | |
43 | #endif | |
44 | ||
45 | #ifdef DEBUG_IP_FIREWALL_USER | |
46 | #define duprintf(format, args...) printk(format , ## args) | |
47 | #else | |
48 | #define duprintf(format, args...) | |
49 | #endif | |
50 | ||
51 | #ifdef CONFIG_NETFILTER_DEBUG | |
52 | #define IP_NF_ASSERT(x) \ | |
53 | do { \ | |
54 | if (!(x)) \ | |
55 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ | |
0dc47877 | 56 | __func__, __FILE__, __LINE__); \ |
1da177e4 LT |
57 | } while(0) |
58 | #else | |
59 | #define IP_NF_ASSERT(x) | |
60 | #endif | |
1da177e4 LT |
61 | |
62 | #if 0 | |
63 | /* All the better to debug you with... */ | |
64 | #define static | |
65 | #define inline | |
66 | #endif | |
67 | ||
68 | /* | |
69 | We keep a set of rules for each CPU, so we can avoid write-locking | |
70 | them in the softirq when updating the counters and therefore | |
71 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
72 | context stops packets coming through and allows user context to read | |
73 | the counters or update the rules. | |
74 | ||
1da177e4 LT |
75 | Hence the start of any table is given by get_table() below. */ |
76 | ||
1da177e4 | 77 | /* Returns whether matches rule or not. */ |
022748a9 | 78 | /* Performance critical - called for every packet */ |
9c547959 | 79 | static inline bool |
1da177e4 LT |
80 | ip_packet_match(const struct iphdr *ip, |
81 | const char *indev, | |
82 | const char *outdev, | |
83 | const struct ipt_ip *ipinfo, | |
84 | int isfrag) | |
85 | { | |
1da177e4 LT |
86 | unsigned long ret; |
87 | ||
e79ec50b | 88 | #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) |
1da177e4 LT |
89 | |
90 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, | |
91 | IPT_INV_SRCIP) | |
92 | || FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, | |
93 | IPT_INV_DSTIP)) { | |
94 | dprintf("Source or dest mismatch.\n"); | |
95 | ||
cffee385 HH |
96 | dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n", |
97 | &ip->saddr, &ipinfo->smsk.s_addr, &ipinfo->src.s_addr, | |
1da177e4 | 98 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); |
cffee385 HH |
99 | dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n", |
100 | &ip->daddr, &ipinfo->dmsk.s_addr, &ipinfo->dst.s_addr, | |
1da177e4 | 101 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); |
9c547959 | 102 | return false; |
1da177e4 LT |
103 | } |
104 | ||
b8dfe498 | 105 | ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask); |
1da177e4 LT |
106 | |
107 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { | |
108 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
109 | indev, ipinfo->iniface, | |
110 | ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":""); | |
9c547959 | 111 | return false; |
1da177e4 LT |
112 | } |
113 | ||
b8dfe498 | 114 | ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
1da177e4 LT |
115 | |
116 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { | |
117 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
118 | outdev, ipinfo->outiface, | |
119 | ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":""); | |
9c547959 | 120 | return false; |
1da177e4 LT |
121 | } |
122 | ||
123 | /* Check specific protocol */ | |
124 | if (ipinfo->proto | |
125 | && FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { | |
126 | dprintf("Packet protocol %hi does not match %hi.%s\n", | |
127 | ip->protocol, ipinfo->proto, | |
128 | ipinfo->invflags&IPT_INV_PROTO ? " (INV)":""); | |
9c547959 | 129 | return false; |
1da177e4 LT |
130 | } |
131 | ||
132 | /* If we have a fragment rule but the packet is not a fragment | |
133 | * then we return zero */ | |
134 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { | |
135 | dprintf("Fragment rule but not fragment.%s\n", | |
136 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); | |
9c547959 | 137 | return false; |
1da177e4 LT |
138 | } |
139 | ||
9c547959 | 140 | return true; |
1da177e4 LT |
141 | } |
142 | ||
022748a9 | 143 | static bool |
1da177e4 LT |
144 | ip_checkentry(const struct ipt_ip *ip) |
145 | { | |
146 | if (ip->flags & ~IPT_F_MASK) { | |
147 | duprintf("Unknown flag bits set: %08X\n", | |
148 | ip->flags & ~IPT_F_MASK); | |
ccb79bdc | 149 | return false; |
1da177e4 LT |
150 | } |
151 | if (ip->invflags & ~IPT_INV_MASK) { | |
152 | duprintf("Unknown invflag bits set: %08X\n", | |
153 | ip->invflags & ~IPT_INV_MASK); | |
ccb79bdc | 154 | return false; |
1da177e4 | 155 | } |
ccb79bdc | 156 | return true; |
1da177e4 LT |
157 | } |
158 | ||
159 | static unsigned int | |
7eb35586 | 160 | ipt_error(struct sk_buff *skb, const struct xt_target_param *par) |
1da177e4 LT |
161 | { |
162 | if (net_ratelimit()) | |
7eb35586 JE |
163 | printk("ip_tables: error: `%s'\n", |
164 | (const char *)par->targinfo); | |
1da177e4 LT |
165 | |
166 | return NF_DROP; | |
167 | } | |
168 | ||
022748a9 DV |
169 | /* Performance critical - called for every packet */ |
170 | static inline bool | |
f7108a20 JE |
171 | do_match(struct ipt_entry_match *m, const struct sk_buff *skb, |
172 | struct xt_match_param *par) | |
1da177e4 | 173 | { |
f7108a20 JE |
174 | par->match = m->u.kernel.match; |
175 | par->matchinfo = m->data; | |
176 | ||
1da177e4 | 177 | /* Stop iteration if it doesn't match */ |
f7108a20 | 178 | if (!m->u.kernel.match->match(skb, par)) |
1d93a9cb | 179 | return true; |
1da177e4 | 180 | else |
1d93a9cb | 181 | return false; |
1da177e4 LT |
182 | } |
183 | ||
022748a9 | 184 | /* Performance critical */ |
1da177e4 LT |
185 | static inline struct ipt_entry * |
186 | get_entry(void *base, unsigned int offset) | |
187 | { | |
188 | return (struct ipt_entry *)(base + offset); | |
189 | } | |
190 | ||
ba9dda3a | 191 | /* All zeroes == unconditional rule. */ |
022748a9 | 192 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
193 | static inline int |
194 | unconditional(const struct ipt_ip *ip) | |
195 | { | |
196 | unsigned int i; | |
197 | ||
198 | for (i = 0; i < sizeof(*ip)/sizeof(__u32); i++) | |
199 | if (((__u32 *)ip)[i]) | |
200 | return 0; | |
201 | ||
202 | return 1; | |
e79ec50b | 203 | #undef FWINV |
ba9dda3a JK |
204 | } |
205 | ||
206 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
207 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
022748a9 | 208 | static const char *const hooknames[] = { |
6e23ae2a PM |
209 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
210 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 211 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
212 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
213 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
214 | }; |
215 | ||
216 | enum nf_ip_trace_comments { | |
217 | NF_IP_TRACE_COMMENT_RULE, | |
218 | NF_IP_TRACE_COMMENT_RETURN, | |
219 | NF_IP_TRACE_COMMENT_POLICY, | |
220 | }; | |
221 | ||
022748a9 | 222 | static const char *const comments[] = { |
ba9dda3a JK |
223 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
224 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
225 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
226 | }; | |
227 | ||
228 | static struct nf_loginfo trace_loginfo = { | |
229 | .type = NF_LOG_TYPE_LOG, | |
230 | .u = { | |
231 | .log = { | |
232 | .level = 4, | |
233 | .logflags = NF_LOG_MASK, | |
234 | }, | |
235 | }, | |
236 | }; | |
237 | ||
022748a9 | 238 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
239 | static inline int |
240 | get_chainname_rulenum(struct ipt_entry *s, struct ipt_entry *e, | |
4f2f6f23 JE |
241 | const char *hookname, const char **chainname, |
242 | const char **comment, unsigned int *rulenum) | |
ba9dda3a JK |
243 | { |
244 | struct ipt_standard_target *t = (void *)ipt_get_target(s); | |
245 | ||
246 | if (strcmp(t->target.u.kernel.target->name, IPT_ERROR_TARGET) == 0) { | |
247 | /* Head of user chain: ERROR target with chainname */ | |
248 | *chainname = t->target.data; | |
249 | (*rulenum) = 0; | |
250 | } else if (s == e) { | |
251 | (*rulenum)++; | |
252 | ||
253 | if (s->target_offset == sizeof(struct ipt_entry) | |
254 | && strcmp(t->target.u.kernel.target->name, | |
255 | IPT_STANDARD_TARGET) == 0 | |
256 | && t->verdict < 0 | |
257 | && unconditional(&s->ip)) { | |
258 | /* Tail of chains: STANDARD target (return/policy) */ | |
259 | *comment = *chainname == hookname | |
4f2f6f23 JE |
260 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
261 | : comments[NF_IP_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
262 | } |
263 | return 1; | |
264 | } else | |
265 | (*rulenum)++; | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | static void trace_packet(struct sk_buff *skb, | |
271 | unsigned int hook, | |
272 | const struct net_device *in, | |
273 | const struct net_device *out, | |
ecb6f85e | 274 | const char *tablename, |
ba9dda3a JK |
275 | struct xt_table_info *private, |
276 | struct ipt_entry *e) | |
277 | { | |
278 | void *table_base; | |
5452e425 | 279 | const struct ipt_entry *root; |
4f2f6f23 | 280 | const char *hookname, *chainname, *comment; |
ba9dda3a JK |
281 | unsigned int rulenum = 0; |
282 | ||
ccf5bd8c | 283 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
284 | root = get_entry(table_base, private->hook_entry[hook]); |
285 | ||
4f2f6f23 JE |
286 | hookname = chainname = hooknames[hook]; |
287 | comment = comments[NF_IP_TRACE_COMMENT_RULE]; | |
ba9dda3a JK |
288 | |
289 | IPT_ENTRY_ITERATE(root, | |
290 | private->size - private->hook_entry[hook], | |
291 | get_chainname_rulenum, | |
292 | e, hookname, &chainname, &comment, &rulenum); | |
293 | ||
294 | nf_log_packet(AF_INET, hook, skb, in, out, &trace_loginfo, | |
295 | "TRACE: %s:%s:%s:%u ", | |
296 | tablename, chainname, comment, rulenum); | |
297 | } | |
298 | #endif | |
299 | ||
98e86403 JE |
300 | static inline __pure |
301 | struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry) | |
302 | { | |
303 | return (void *)entry + entry->next_offset; | |
304 | } | |
305 | ||
1da177e4 LT |
306 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
307 | unsigned int | |
3db05fea | 308 | ipt_do_table(struct sk_buff *skb, |
1da177e4 LT |
309 | unsigned int hook, |
310 | const struct net_device *in, | |
311 | const struct net_device *out, | |
e60a13e0 | 312 | struct xt_table *table) |
1da177e4 | 313 | { |
bb70dfa5 JE |
314 | #define tb_comefrom ((struct ipt_entry *)table_base)->comefrom |
315 | ||
1da177e4 | 316 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
5452e425 | 317 | const struct iphdr *ip; |
1da177e4 | 318 | u_int16_t datalen; |
cff533ac | 319 | bool hotdrop = false; |
1da177e4 LT |
320 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
321 | unsigned int verdict = NF_DROP; | |
322 | const char *indev, *outdev; | |
323 | void *table_base; | |
324 | struct ipt_entry *e, *back; | |
8311731a | 325 | struct xt_table_info *private; |
f7108a20 | 326 | struct xt_match_param mtpar; |
7eb35586 | 327 | struct xt_target_param tgpar; |
1da177e4 LT |
328 | |
329 | /* Initialization */ | |
3db05fea HX |
330 | ip = ip_hdr(skb); |
331 | datalen = skb->len - ip->ihl * 4; | |
1da177e4 LT |
332 | indev = in ? in->name : nulldevname; |
333 | outdev = out ? out->name : nulldevname; | |
334 | /* We handle fragments by dealing with the first fragment as | |
335 | * if it was a normal packet. All other fragments are treated | |
336 | * normally, except that they will NEVER match rules that ask | |
337 | * things we don't know, ie. tcp syn flag or ports). If the | |
338 | * rule is also a fragment-specific rule, non-fragments won't | |
339 | * match it. */ | |
f7108a20 JE |
340 | mtpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
341 | mtpar.thoff = ip_hdrlen(skb); | |
342 | mtpar.hotdrop = &hotdrop; | |
7eb35586 JE |
343 | mtpar.in = tgpar.in = in; |
344 | mtpar.out = tgpar.out = out; | |
916a917d | 345 | mtpar.family = tgpar.family = NFPROTO_IPV4; |
a5e78820 | 346 | mtpar.hooknum = tgpar.hooknum = hook; |
1da177e4 | 347 | |
1da177e4 | 348 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
942e4a2b SH |
349 | xt_info_rdlock_bh(); |
350 | private = table->private; | |
351 | table_base = private->entries[smp_processor_id()]; | |
78454473 | 352 | |
2e4e6a17 | 353 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 LT |
354 | |
355 | /* For return from builtin chain */ | |
2e4e6a17 | 356 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
357 | |
358 | do { | |
a1ff4ac8 JE |
359 | struct ipt_entry_target *t; |
360 | ||
1da177e4 LT |
361 | IP_NF_ASSERT(e); |
362 | IP_NF_ASSERT(back); | |
a1ff4ac8 | 363 | if (!ip_packet_match(ip, indev, outdev, |
9452258d JE |
364 | &e->ip, mtpar.fragoff) || |
365 | IPT_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) { | |
a1ff4ac8 JE |
366 | e = ipt_next_entry(e); |
367 | continue; | |
368 | } | |
1da177e4 | 369 | |
a1ff4ac8 | 370 | ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1); |
1da177e4 | 371 | |
a1ff4ac8 JE |
372 | t = ipt_get_target(e); |
373 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
374 | |
375 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
376 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
a1ff4ac8 JE |
377 | /* The packet is traced: log it */ |
378 | if (unlikely(skb->nf_trace)) | |
379 | trace_packet(skb, hook, in, out, | |
380 | table->name, private, e); | |
ba9dda3a | 381 | #endif |
a1ff4ac8 JE |
382 | /* Standard target? */ |
383 | if (!t->u.kernel.target->target) { | |
384 | int v; | |
385 | ||
386 | v = ((struct ipt_standard_target *)t)->verdict; | |
387 | if (v < 0) { | |
388 | /* Pop from stack? */ | |
389 | if (v != IPT_RETURN) { | |
390 | verdict = (unsigned)(-v) - 1; | |
391 | break; | |
1da177e4 | 392 | } |
a1ff4ac8 JE |
393 | e = back; |
394 | back = get_entry(table_base, back->comefrom); | |
395 | continue; | |
396 | } | |
397 | if (table_base + v != ipt_next_entry(e) | |
398 | && !(e->ip.flags & IPT_F_GOTO)) { | |
399 | /* Save old back ptr in next entry */ | |
400 | struct ipt_entry *next = ipt_next_entry(e); | |
401 | next->comefrom = (void *)back - table_base; | |
402 | /* set back pointer to next entry */ | |
403 | back = next; | |
404 | } | |
1da177e4 | 405 | |
a1ff4ac8 | 406 | e = get_entry(table_base, v); |
7a6b1c46 JE |
407 | continue; |
408 | } | |
409 | ||
410 | /* Targets which reenter must return | |
411 | abs. verdicts */ | |
412 | tgpar.target = t->u.kernel.target; | |
413 | tgpar.targinfo = t->data; | |
bb70dfa5 JE |
414 | |
415 | ||
1da177e4 | 416 | #ifdef CONFIG_NETFILTER_DEBUG |
bb70dfa5 | 417 | tb_comefrom = 0xeeeeeeec; |
1da177e4 | 418 | #endif |
7a6b1c46 | 419 | verdict = t->u.kernel.target->target(skb, &tgpar); |
1da177e4 | 420 | #ifdef CONFIG_NETFILTER_DEBUG |
24992eac | 421 | if (tb_comefrom != 0xeeeeeeec && verdict == IPT_CONTINUE) { |
7a6b1c46 JE |
422 | printk("Target %s reentered!\n", |
423 | t->u.kernel.target->name); | |
424 | verdict = NF_DROP; | |
1da177e4 | 425 | } |
bb70dfa5 | 426 | tb_comefrom = 0x57acc001; |
7a6b1c46 JE |
427 | #endif |
428 | /* Target might have changed stuff. */ | |
429 | ip = ip_hdr(skb); | |
430 | datalen = skb->len - ip->ihl * 4; | |
431 | ||
432 | if (verdict == IPT_CONTINUE) | |
433 | e = ipt_next_entry(e); | |
434 | else | |
435 | /* Verdict */ | |
436 | break; | |
1da177e4 | 437 | } while (!hotdrop); |
942e4a2b | 438 | xt_info_rdunlock_bh(); |
1da177e4 LT |
439 | |
440 | #ifdef DEBUG_ALLOW_ALL | |
441 | return NF_ACCEPT; | |
442 | #else | |
443 | if (hotdrop) | |
444 | return NF_DROP; | |
445 | else return verdict; | |
446 | #endif | |
bb70dfa5 JE |
447 | |
448 | #undef tb_comefrom | |
1da177e4 LT |
449 | } |
450 | ||
1da177e4 LT |
451 | /* Figures out from what hook each rule can be called: returns 0 if |
452 | there are loops. Puts hook bitmask in comefrom. */ | |
453 | static int | |
2e4e6a17 | 454 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 455 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
456 | { |
457 | unsigned int hook; | |
458 | ||
459 | /* No recursion; use packet counter to save back ptrs (reset | |
460 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 461 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 462 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 463 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
464 | |
465 | if (!(valid_hooks & (1 << hook))) | |
466 | continue; | |
467 | ||
468 | /* Set initial back pointer. */ | |
469 | e->counters.pcnt = pos; | |
470 | ||
471 | for (;;) { | |
472 | struct ipt_standard_target *t | |
473 | = (void *)ipt_get_target(e); | |
e1b4b9f3 | 474 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 475 | |
6e23ae2a | 476 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
477 | printk("iptables: loop hook %u pos %u %08X.\n", |
478 | hook, pos, e->comefrom); | |
479 | return 0; | |
480 | } | |
9c547959 | 481 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
482 | |
483 | /* Unconditional return/END. */ | |
e1b4b9f3 | 484 | if ((e->target_offset == sizeof(struct ipt_entry) |
1da177e4 LT |
485 | && (strcmp(t->target.u.user.name, |
486 | IPT_STANDARD_TARGET) == 0) | |
487 | && t->verdict < 0 | |
e1b4b9f3 | 488 | && unconditional(&e->ip)) || visited) { |
1da177e4 LT |
489 | unsigned int oldpos, size; |
490 | ||
1f9352ae PM |
491 | if ((strcmp(t->target.u.user.name, |
492 | IPT_STANDARD_TARGET) == 0) && | |
493 | t->verdict < -NF_MAX_VERDICT - 1) { | |
74c9c0c1 DM |
494 | duprintf("mark_source_chains: bad " |
495 | "negative verdict (%i)\n", | |
496 | t->verdict); | |
497 | return 0; | |
498 | } | |
499 | ||
1da177e4 LT |
500 | /* Return: backtrack through the last |
501 | big jump. */ | |
502 | do { | |
6e23ae2a | 503 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
504 | #ifdef DEBUG_IP_FIREWALL_USER |
505 | if (e->comefrom | |
6e23ae2a | 506 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
507 | duprintf("Back unset " |
508 | "on hook %u " | |
509 | "rule %u\n", | |
510 | hook, pos); | |
511 | } | |
512 | #endif | |
513 | oldpos = pos; | |
514 | pos = e->counters.pcnt; | |
515 | e->counters.pcnt = 0; | |
516 | ||
517 | /* We're at the start. */ | |
518 | if (pos == oldpos) | |
519 | goto next; | |
520 | ||
521 | e = (struct ipt_entry *) | |
31836064 | 522 | (entry0 + pos); |
1da177e4 LT |
523 | } while (oldpos == pos + e->next_offset); |
524 | ||
525 | /* Move along one */ | |
526 | size = e->next_offset; | |
527 | e = (struct ipt_entry *) | |
31836064 | 528 | (entry0 + pos + size); |
1da177e4 LT |
529 | e->counters.pcnt = pos; |
530 | pos += size; | |
531 | } else { | |
532 | int newpos = t->verdict; | |
533 | ||
534 | if (strcmp(t->target.u.user.name, | |
535 | IPT_STANDARD_TARGET) == 0 | |
536 | && newpos >= 0) { | |
74c9c0c1 DM |
537 | if (newpos > newinfo->size - |
538 | sizeof(struct ipt_entry)) { | |
539 | duprintf("mark_source_chains: " | |
540 | "bad verdict (%i)\n", | |
541 | newpos); | |
542 | return 0; | |
543 | } | |
1da177e4 LT |
544 | /* This a jump; chase it. */ |
545 | duprintf("Jump rule %u -> %u\n", | |
546 | pos, newpos); | |
547 | } else { | |
548 | /* ... this is a fallthru */ | |
549 | newpos = pos + e->next_offset; | |
550 | } | |
551 | e = (struct ipt_entry *) | |
31836064 | 552 | (entry0 + newpos); |
1da177e4 LT |
553 | e->counters.pcnt = pos; |
554 | pos = newpos; | |
555 | } | |
556 | } | |
557 | next: | |
558 | duprintf("Finished chain %u\n", hook); | |
559 | } | |
560 | return 1; | |
561 | } | |
562 | ||
022748a9 | 563 | static int |
1da177e4 LT |
564 | cleanup_match(struct ipt_entry_match *m, unsigned int *i) |
565 | { | |
6be3d859 JE |
566 | struct xt_mtdtor_param par; |
567 | ||
1da177e4 LT |
568 | if (i && (*i)-- == 0) |
569 | return 1; | |
570 | ||
6be3d859 JE |
571 | par.match = m->u.kernel.match; |
572 | par.matchinfo = m->data; | |
916a917d | 573 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
574 | if (par.match->destroy != NULL) |
575 | par.match->destroy(&par); | |
576 | module_put(par.match->me); | |
1da177e4 LT |
577 | return 0; |
578 | } | |
579 | ||
022748a9 | 580 | static int |
a96be246 DM |
581 | check_entry(struct ipt_entry *e, const char *name) |
582 | { | |
583 | struct ipt_entry_target *t; | |
584 | ||
585 | if (!ip_checkentry(&e->ip)) { | |
586 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
587 | return -EINVAL; | |
588 | } | |
589 | ||
9c547959 PM |
590 | if (e->target_offset + sizeof(struct ipt_entry_target) > |
591 | e->next_offset) | |
a96be246 DM |
592 | return -EINVAL; |
593 | ||
594 | t = ipt_get_target(e); | |
595 | if (e->target_offset + t->u.target_size > e->next_offset) | |
596 | return -EINVAL; | |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
022748a9 | 601 | static int |
9b4fce7a JE |
602 | check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par, |
603 | unsigned int *i) | |
a96be246 | 604 | { |
9b4fce7a | 605 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 DM |
606 | int ret; |
607 | ||
9b4fce7a JE |
608 | par->match = m->u.kernel.match; |
609 | par->matchinfo = m->data; | |
610 | ||
916a917d | 611 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 612 | ip->proto, ip->invflags & IPT_INV_PROTO); |
367c6790 | 613 | if (ret < 0) { |
a96be246 | 614 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 615 | par.match->name); |
367c6790 | 616 | return ret; |
a96be246 | 617 | } |
367c6790 JE |
618 | ++*i; |
619 | return 0; | |
a96be246 DM |
620 | } |
621 | ||
022748a9 | 622 | static int |
9b4fce7a | 623 | find_check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par, |
4b478248 | 624 | unsigned int *i) |
1da177e4 | 625 | { |
6709dbbb | 626 | struct xt_match *match; |
3cdc7c95 | 627 | int ret; |
1da177e4 | 628 | |
2e4e6a17 | 629 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, |
9c547959 | 630 | m->u.user.revision), |
1da177e4 LT |
631 | "ipt_%s", m->u.user.name); |
632 | if (IS_ERR(match) || !match) { | |
a96be246 | 633 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
1da177e4 LT |
634 | return match ? PTR_ERR(match) : -ENOENT; |
635 | } | |
636 | m->u.kernel.match = match; | |
637 | ||
9b4fce7a | 638 | ret = check_match(m, par, i); |
3cdc7c95 PM |
639 | if (ret) |
640 | goto err; | |
641 | ||
1da177e4 | 642 | return 0; |
3cdc7c95 PM |
643 | err: |
644 | module_put(m->u.kernel.match->me); | |
645 | return ret; | |
1da177e4 LT |
646 | } |
647 | ||
022748a9 | 648 | static int check_target(struct ipt_entry *e, const char *name) |
a96be246 | 649 | { |
af5d6dc2 JE |
650 | struct ipt_entry_target *t = ipt_get_target(e); |
651 | struct xt_tgchk_param par = { | |
652 | .table = name, | |
653 | .entryinfo = e, | |
654 | .target = t->u.kernel.target, | |
655 | .targinfo = t->data, | |
656 | .hook_mask = e->comefrom, | |
916a917d | 657 | .family = NFPROTO_IPV4, |
af5d6dc2 | 658 | }; |
e905a9ed | 659 | int ret; |
a96be246 | 660 | |
916a917d | 661 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 662 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
367c6790 | 663 | if (ret < 0) { |
a96be246 DM |
664 | duprintf("ip_tables: check failed for `%s'.\n", |
665 | t->u.kernel.target->name); | |
367c6790 | 666 | return ret; |
a96be246 | 667 | } |
367c6790 | 668 | return 0; |
a96be246 | 669 | } |
1da177e4 | 670 | |
022748a9 | 671 | static int |
a96be246 | 672 | find_check_entry(struct ipt_entry *e, const char *name, unsigned int size, |
4b478248 | 673 | unsigned int *i) |
1da177e4 LT |
674 | { |
675 | struct ipt_entry_target *t; | |
6709dbbb | 676 | struct xt_target *target; |
1da177e4 LT |
677 | int ret; |
678 | unsigned int j; | |
9b4fce7a | 679 | struct xt_mtchk_param mtpar; |
1da177e4 | 680 | |
a96be246 DM |
681 | ret = check_entry(e, name); |
682 | if (ret) | |
683 | return ret; | |
590bdf7f | 684 | |
1da177e4 | 685 | j = 0; |
9b4fce7a JE |
686 | mtpar.table = name; |
687 | mtpar.entryinfo = &e->ip; | |
688 | mtpar.hook_mask = e->comefrom; | |
916a917d | 689 | mtpar.family = NFPROTO_IPV4; |
9b4fce7a | 690 | ret = IPT_MATCH_ITERATE(e, find_check_match, &mtpar, &j); |
1da177e4 LT |
691 | if (ret != 0) |
692 | goto cleanup_matches; | |
693 | ||
694 | t = ipt_get_target(e); | |
2e4e6a17 | 695 | target = try_then_request_module(xt_find_target(AF_INET, |
4b478248 PM |
696 | t->u.user.name, |
697 | t->u.user.revision), | |
1da177e4 LT |
698 | "ipt_%s", t->u.user.name); |
699 | if (IS_ERR(target) || !target) { | |
a96be246 | 700 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
1da177e4 LT |
701 | ret = target ? PTR_ERR(target) : -ENOENT; |
702 | goto cleanup_matches; | |
703 | } | |
704 | t->u.kernel.target = target; | |
705 | ||
a96be246 | 706 | ret = check_target(e, name); |
3cdc7c95 PM |
707 | if (ret) |
708 | goto err; | |
709 | ||
1da177e4 LT |
710 | (*i)++; |
711 | return 0; | |
3cdc7c95 PM |
712 | err: |
713 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
714 | cleanup_matches: |
715 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
716 | return ret; | |
717 | } | |
718 | ||
022748a9 | 719 | static int |
1da177e4 | 720 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 721 | struct xt_table_info *newinfo, |
1da177e4 LT |
722 | unsigned char *base, |
723 | unsigned char *limit, | |
724 | const unsigned int *hook_entries, | |
725 | const unsigned int *underflows, | |
726 | unsigned int *i) | |
727 | { | |
728 | unsigned int h; | |
729 | ||
730 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 | |
731 | || (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { | |
732 | duprintf("Bad offset %p\n", e); | |
733 | return -EINVAL; | |
734 | } | |
735 | ||
736 | if (e->next_offset | |
737 | < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) { | |
738 | duprintf("checking: element %p size %u\n", | |
739 | e, e->next_offset); | |
740 | return -EINVAL; | |
741 | } | |
742 | ||
743 | /* Check hooks & underflows */ | |
6e23ae2a | 744 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
1da177e4 LT |
745 | if ((unsigned char *)e - base == hook_entries[h]) |
746 | newinfo->hook_entry[h] = hook_entries[h]; | |
747 | if ((unsigned char *)e - base == underflows[h]) | |
748 | newinfo->underflow[h] = underflows[h]; | |
749 | } | |
750 | ||
751 | /* FIXME: underflows must be unconditional, standard verdicts | |
e905a9ed | 752 | < 0 (not IPT_RETURN). --RR */ |
1da177e4 LT |
753 | |
754 | /* Clear counters and comefrom */ | |
2e4e6a17 | 755 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
756 | e->comefrom = 0; |
757 | ||
758 | (*i)++; | |
759 | return 0; | |
760 | } | |
761 | ||
022748a9 | 762 | static int |
1da177e4 LT |
763 | cleanup_entry(struct ipt_entry *e, unsigned int *i) |
764 | { | |
a2df1648 | 765 | struct xt_tgdtor_param par; |
1da177e4 LT |
766 | struct ipt_entry_target *t; |
767 | ||
768 | if (i && (*i)-- == 0) | |
769 | return 1; | |
770 | ||
771 | /* Cleanup all matches */ | |
772 | IPT_MATCH_ITERATE(e, cleanup_match, NULL); | |
773 | t = ipt_get_target(e); | |
a2df1648 JE |
774 | |
775 | par.target = t->u.kernel.target; | |
776 | par.targinfo = t->data; | |
916a917d | 777 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
778 | if (par.target->destroy != NULL) |
779 | par.target->destroy(&par); | |
780 | module_put(par.target->me); | |
1da177e4 LT |
781 | return 0; |
782 | } | |
783 | ||
784 | /* Checks and translates the user-supplied table segment (held in | |
785 | newinfo) */ | |
786 | static int | |
787 | translate_table(const char *name, | |
788 | unsigned int valid_hooks, | |
2e4e6a17 | 789 | struct xt_table_info *newinfo, |
31836064 | 790 | void *entry0, |
1da177e4 LT |
791 | unsigned int size, |
792 | unsigned int number, | |
793 | const unsigned int *hook_entries, | |
794 | const unsigned int *underflows) | |
795 | { | |
796 | unsigned int i; | |
797 | int ret; | |
798 | ||
799 | newinfo->size = size; | |
800 | newinfo->number = number; | |
801 | ||
802 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 803 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
804 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
805 | newinfo->underflow[i] = 0xFFFFFFFF; | |
806 | } | |
807 | ||
808 | duprintf("translate_table: size %u\n", newinfo->size); | |
809 | i = 0; | |
810 | /* Walk through entries, checking offsets. */ | |
31836064 | 811 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
812 | check_entry_size_and_hooks, |
813 | newinfo, | |
31836064 ED |
814 | entry0, |
815 | entry0 + size, | |
1da177e4 LT |
816 | hook_entries, underflows, &i); |
817 | if (ret != 0) | |
818 | return ret; | |
819 | ||
820 | if (i != number) { | |
821 | duprintf("translate_table: %u not %u entries\n", | |
822 | i, number); | |
823 | return -EINVAL; | |
824 | } | |
825 | ||
826 | /* Check hooks all assigned */ | |
6e23ae2a | 827 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
828 | /* Only hooks which are valid */ |
829 | if (!(valid_hooks & (1 << i))) | |
830 | continue; | |
831 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
832 | duprintf("Invalid hook entry %u %u\n", | |
833 | i, hook_entries[i]); | |
834 | return -EINVAL; | |
835 | } | |
836 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
837 | duprintf("Invalid underflow %u %u\n", | |
838 | i, underflows[i]); | |
839 | return -EINVAL; | |
840 | } | |
841 | } | |
842 | ||
74c9c0c1 DM |
843 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
844 | return -ELOOP; | |
845 | ||
1da177e4 LT |
846 | /* Finally, each sanity check must pass */ |
847 | i = 0; | |
31836064 | 848 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
a96be246 | 849 | find_check_entry, name, size, &i); |
1da177e4 | 850 | |
74c9c0c1 DM |
851 | if (ret != 0) { |
852 | IPT_ENTRY_ITERATE(entry0, newinfo->size, | |
853 | cleanup_entry, &i); | |
854 | return ret; | |
855 | } | |
1da177e4 LT |
856 | |
857 | /* And one copy for every other CPU */ | |
6f912042 | 858 | for_each_possible_cpu(i) { |
31836064 ED |
859 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
860 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
861 | } |
862 | ||
863 | return ret; | |
864 | } | |
865 | ||
1da177e4 LT |
866 | /* Gets counters. */ |
867 | static inline int | |
868 | add_entry_to_counter(const struct ipt_entry *e, | |
2e4e6a17 | 869 | struct xt_counters total[], |
1da177e4 LT |
870 | unsigned int *i) |
871 | { | |
872 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
873 | ||
874 | (*i)++; | |
875 | return 0; | |
876 | } | |
877 | ||
31836064 ED |
878 | static inline int |
879 | set_entry_to_counter(const struct ipt_entry *e, | |
880 | struct ipt_counters total[], | |
881 | unsigned int *i) | |
882 | { | |
883 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
884 | ||
885 | (*i)++; | |
886 | return 0; | |
887 | } | |
888 | ||
1da177e4 | 889 | static void |
2e4e6a17 HW |
890 | get_counters(const struct xt_table_info *t, |
891 | struct xt_counters counters[]) | |
1da177e4 LT |
892 | { |
893 | unsigned int cpu; | |
894 | unsigned int i; | |
31836064 ED |
895 | unsigned int curcpu; |
896 | ||
897 | /* Instead of clearing (by a previous call to memset()) | |
898 | * the counters and using adds, we set the counters | |
942e4a2b SH |
899 | * with data used by 'current' CPU. |
900 | * | |
901 | * Bottom half has to be disabled to prevent deadlock | |
902 | * if new softirq were to run and call ipt_do_table | |
31836064 | 903 | */ |
942e4a2b SH |
904 | local_bh_disable(); |
905 | curcpu = smp_processor_id(); | |
31836064 ED |
906 | |
907 | i = 0; | |
908 | IPT_ENTRY_ITERATE(t->entries[curcpu], | |
909 | t->size, | |
910 | set_entry_to_counter, | |
911 | counters, | |
912 | &i); | |
1da177e4 | 913 | |
6f912042 | 914 | for_each_possible_cpu(cpu) { |
31836064 ED |
915 | if (cpu == curcpu) |
916 | continue; | |
1da177e4 | 917 | i = 0; |
942e4a2b | 918 | xt_info_wrlock(cpu); |
31836064 | 919 | IPT_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
920 | t->size, |
921 | add_entry_to_counter, | |
922 | counters, | |
923 | &i); | |
942e4a2b | 924 | xt_info_wrunlock(cpu); |
1da177e4 | 925 | } |
78454473 SH |
926 | local_bh_enable(); |
927 | } | |
928 | ||
022748a9 | 929 | static struct xt_counters * alloc_counters(struct xt_table *table) |
1da177e4 | 930 | { |
2722971c | 931 | unsigned int countersize; |
2e4e6a17 | 932 | struct xt_counters *counters; |
78454473 | 933 | struct xt_table_info *private = table->private; |
1da177e4 LT |
934 | |
935 | /* We need atomic snapshot of counters: rest doesn't change | |
936 | (other than comefrom, which userspace doesn't care | |
937 | about). */ | |
2e4e6a17 | 938 | countersize = sizeof(struct xt_counters) * private->number; |
31836064 | 939 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
940 | |
941 | if (counters == NULL) | |
942e4a2b | 942 | return ERR_PTR(-ENOMEM); |
78454473 | 943 | |
942e4a2b | 944 | get_counters(private, counters); |
1da177e4 | 945 | |
2722971c DM |
946 | return counters; |
947 | } | |
948 | ||
949 | static int | |
950 | copy_entries_to_user(unsigned int total_size, | |
e60a13e0 | 951 | struct xt_table *table, |
2722971c DM |
952 | void __user *userptr) |
953 | { | |
954 | unsigned int off, num; | |
955 | struct ipt_entry *e; | |
956 | struct xt_counters *counters; | |
5452e425 | 957 | const struct xt_table_info *private = table->private; |
2722971c | 958 | int ret = 0; |
5452e425 | 959 | const void *loc_cpu_entry; |
2722971c DM |
960 | |
961 | counters = alloc_counters(table); | |
962 | if (IS_ERR(counters)) | |
963 | return PTR_ERR(counters); | |
964 | ||
31836064 ED |
965 | /* choose the copy that is on our node/cpu, ... |
966 | * This choice is lazy (because current thread is | |
967 | * allowed to migrate to another cpu) | |
968 | */ | |
2e4e6a17 | 969 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 970 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
971 | ret = -EFAULT; |
972 | goto free_counters; | |
973 | } | |
974 | ||
975 | /* FIXME: use iterator macros --RR */ | |
976 | /* ... then go back and fix counters and names */ | |
977 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
978 | unsigned int i; | |
5452e425 JE |
979 | const struct ipt_entry_match *m; |
980 | const struct ipt_entry_target *t; | |
1da177e4 | 981 | |
31836064 | 982 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
983 | if (copy_to_user(userptr + off |
984 | + offsetof(struct ipt_entry, counters), | |
985 | &counters[num], | |
986 | sizeof(counters[num])) != 0) { | |
987 | ret = -EFAULT; | |
988 | goto free_counters; | |
989 | } | |
990 | ||
991 | for (i = sizeof(struct ipt_entry); | |
992 | i < e->target_offset; | |
993 | i += m->u.match_size) { | |
994 | m = (void *)e + i; | |
995 | ||
996 | if (copy_to_user(userptr + off + i | |
997 | + offsetof(struct ipt_entry_match, | |
998 | u.user.name), | |
999 | m->u.kernel.match->name, | |
1000 | strlen(m->u.kernel.match->name)+1) | |
1001 | != 0) { | |
1002 | ret = -EFAULT; | |
1003 | goto free_counters; | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | t = ipt_get_target(e); | |
1008 | if (copy_to_user(userptr + off + e->target_offset | |
1009 | + offsetof(struct ipt_entry_target, | |
1010 | u.user.name), | |
1011 | t->u.kernel.target->name, | |
1012 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1013 | ret = -EFAULT; | |
1014 | goto free_counters; | |
1015 | } | |
1016 | } | |
1017 | ||
1018 | free_counters: | |
1019 | vfree(counters); | |
1020 | return ret; | |
1021 | } | |
1022 | ||
2722971c | 1023 | #ifdef CONFIG_COMPAT |
9fa492cd | 1024 | static void compat_standard_from_user(void *dst, void *src) |
2722971c | 1025 | { |
9fa492cd | 1026 | int v = *(compat_int_t *)src; |
2722971c | 1027 | |
9fa492cd | 1028 | if (v > 0) |
b386d9f5 | 1029 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1030 | memcpy(dst, &v, sizeof(v)); |
1031 | } | |
46c5ea3c | 1032 | |
9fa492cd | 1033 | static int compat_standard_to_user(void __user *dst, void *src) |
2722971c | 1034 | { |
9fa492cd | 1035 | compat_int_t cv = *(int *)src; |
2722971c | 1036 | |
9fa492cd | 1037 | if (cv > 0) |
b386d9f5 | 1038 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1039 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1040 | } |
1041 | ||
1042 | static inline int | |
4b478248 | 1043 | compat_calc_match(struct ipt_entry_match *m, int *size) |
2722971c | 1044 | { |
9fa492cd | 1045 | *size += xt_compat_match_offset(m->u.kernel.match); |
2722971c DM |
1046 | return 0; |
1047 | } | |
1048 | ||
259d4e41 | 1049 | static int compat_calc_entry(struct ipt_entry *e, |
4b478248 PM |
1050 | const struct xt_table_info *info, |
1051 | void *base, struct xt_table_info *newinfo) | |
2722971c DM |
1052 | { |
1053 | struct ipt_entry_target *t; | |
e5b5ef7d | 1054 | unsigned int entry_offset; |
2722971c DM |
1055 | int off, i, ret; |
1056 | ||
30c08c41 | 1057 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1058 | entry_offset = (void *)e - base; |
1059 | IPT_MATCH_ITERATE(e, compat_calc_match, &off); | |
1060 | t = ipt_get_target(e); | |
9fa492cd | 1061 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1062 | newinfo->size -= off; |
b386d9f5 | 1063 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1064 | if (ret) |
1065 | return ret; | |
1066 | ||
6e23ae2a | 1067 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1068 | if (info->hook_entry[i] && |
1069 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1070 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1071 | if (info->underflow[i] && |
1072 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1073 | newinfo->underflow[i] -= off; |
1074 | } | |
1075 | return 0; | |
1076 | } | |
1077 | ||
259d4e41 | 1078 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1079 | struct xt_table_info *newinfo) |
2722971c DM |
1080 | { |
1081 | void *loc_cpu_entry; | |
2722971c DM |
1082 | |
1083 | if (!newinfo || !info) | |
1084 | return -EINVAL; | |
1085 | ||
259d4e41 ED |
1086 | /* we dont care about newinfo->entries[] */ |
1087 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1088 | newinfo->initial_entries = 0; | |
2722971c DM |
1089 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
1090 | return IPT_ENTRY_ITERATE(loc_cpu_entry, info->size, | |
4b478248 PM |
1091 | compat_calc_entry, info, loc_cpu_entry, |
1092 | newinfo); | |
2722971c DM |
1093 | } |
1094 | #endif | |
1095 | ||
34bd137b | 1096 | static int get_info(struct net *net, void __user *user, int *len, int compat) |
2722971c DM |
1097 | { |
1098 | char name[IPT_TABLE_MAXNAMELEN]; | |
e60a13e0 | 1099 | struct xt_table *t; |
2722971c DM |
1100 | int ret; |
1101 | ||
1102 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1103 | duprintf("length %u != %zu\n", *len, |
1104 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1105 | return -EINVAL; |
1106 | } | |
1107 | ||
1108 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1109 | return -EFAULT; | |
1110 | ||
1111 | name[IPT_TABLE_MAXNAMELEN-1] = '\0'; | |
1112 | #ifdef CONFIG_COMPAT | |
1113 | if (compat) | |
1114 | xt_compat_lock(AF_INET); | |
1115 | #endif | |
34bd137b | 1116 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1117 | "iptable_%s", name); |
2722971c DM |
1118 | if (t && !IS_ERR(t)) { |
1119 | struct ipt_getinfo info; | |
5452e425 | 1120 | const struct xt_table_info *private = t->private; |
2722971c DM |
1121 | |
1122 | #ifdef CONFIG_COMPAT | |
1123 | if (compat) { | |
1124 | struct xt_table_info tmp; | |
1125 | ret = compat_table_info(private, &tmp); | |
b386d9f5 | 1126 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1127 | private = &tmp; |
2722971c DM |
1128 | } |
1129 | #endif | |
1130 | info.valid_hooks = t->valid_hooks; | |
1131 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1132 | sizeof(info.hook_entry)); |
2722971c | 1133 | memcpy(info.underflow, private->underflow, |
4b478248 | 1134 | sizeof(info.underflow)); |
2722971c DM |
1135 | info.num_entries = private->number; |
1136 | info.size = private->size; | |
1137 | strcpy(info.name, name); | |
1138 | ||
1139 | if (copy_to_user(user, &info, *len) != 0) | |
1140 | ret = -EFAULT; | |
1141 | else | |
1142 | ret = 0; | |
1143 | ||
1144 | xt_table_unlock(t); | |
1145 | module_put(t->me); | |
1146 | } else | |
1147 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1148 | #ifdef CONFIG_COMPAT | |
1149 | if (compat) | |
1150 | xt_compat_unlock(AF_INET); | |
1151 | #endif | |
1152 | return ret; | |
1153 | } | |
1154 | ||
1155 | static int | |
34bd137b | 1156 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, int *len) |
2722971c DM |
1157 | { |
1158 | int ret; | |
1159 | struct ipt_get_entries get; | |
e60a13e0 | 1160 | struct xt_table *t; |
2722971c DM |
1161 | |
1162 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1163 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1164 | return -EINVAL; |
1165 | } | |
1166 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1167 | return -EFAULT; | |
1168 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1169 | duprintf("get_entries: %u != %zu\n", |
1170 | *len, sizeof(get) + get.size); | |
2722971c DM |
1171 | return -EINVAL; |
1172 | } | |
1173 | ||
34bd137b | 1174 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1175 | if (t && !IS_ERR(t)) { |
5452e425 | 1176 | const struct xt_table_info *private = t->private; |
9c547959 | 1177 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1178 | if (get.size == private->size) |
1179 | ret = copy_entries_to_user(private->size, | |
1180 | t, uptr->entrytable); | |
1181 | else { | |
1182 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1183 | private->size, get.size); |
544473c1 | 1184 | ret = -EAGAIN; |
2722971c DM |
1185 | } |
1186 | module_put(t->me); | |
1187 | xt_table_unlock(t); | |
1188 | } else | |
1189 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1190 | ||
1191 | return ret; | |
1192 | } | |
1193 | ||
1194 | static int | |
34bd137b | 1195 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1196 | struct xt_table_info *newinfo, unsigned int num_counters, |
1197 | void __user *counters_ptr) | |
2722971c DM |
1198 | { |
1199 | int ret; | |
e60a13e0 | 1200 | struct xt_table *t; |
2722971c DM |
1201 | struct xt_table_info *oldinfo; |
1202 | struct xt_counters *counters; | |
1203 | void *loc_cpu_old_entry; | |
1204 | ||
1205 | ret = 0; | |
1206 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); | |
1207 | if (!counters) { | |
1208 | ret = -ENOMEM; | |
1209 | goto out; | |
1210 | } | |
1211 | ||
34bd137b | 1212 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c DM |
1213 | "iptable_%s", name); |
1214 | if (!t || IS_ERR(t)) { | |
1215 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1216 | goto free_newinfo_counters_untrans; | |
1217 | } | |
1218 | ||
1219 | /* You lied! */ | |
1220 | if (valid_hooks != t->valid_hooks) { | |
1221 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1222 | valid_hooks, t->valid_hooks); | |
1223 | ret = -EINVAL; | |
1224 | goto put_module; | |
1225 | } | |
1226 | ||
1227 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1228 | if (!oldinfo) | |
1229 | goto put_module; | |
1230 | ||
1231 | /* Update module usage count based on number of rules */ | |
1232 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1233 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1234 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1235 | (newinfo->number <= oldinfo->initial_entries)) | |
1236 | module_put(t->me); | |
1237 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1238 | (newinfo->number <= oldinfo->initial_entries)) | |
1239 | module_put(t->me); | |
1240 | ||
942e4a2b | 1241 | /* Get the old counters, and synchronize with replace */ |
2722971c | 1242 | get_counters(oldinfo, counters); |
942e4a2b | 1243 | |
2722971c DM |
1244 | /* Decrease module usage counts and free resource */ |
1245 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
4b478248 PM |
1246 | IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry, |
1247 | NULL); | |
2722971c DM |
1248 | xt_free_table_info(oldinfo); |
1249 | if (copy_to_user(counters_ptr, counters, | |
1250 | sizeof(struct xt_counters) * num_counters) != 0) | |
1251 | ret = -EFAULT; | |
1252 | vfree(counters); | |
1253 | xt_table_unlock(t); | |
1254 | return ret; | |
1255 | ||
1256 | put_module: | |
1257 | module_put(t->me); | |
1258 | xt_table_unlock(t); | |
1259 | free_newinfo_counters_untrans: | |
1260 | vfree(counters); | |
1261 | out: | |
1262 | return ret; | |
1263 | } | |
1264 | ||
1265 | static int | |
34bd137b | 1266 | do_replace(struct net *net, void __user *user, unsigned int len) |
2722971c DM |
1267 | { |
1268 | int ret; | |
1269 | struct ipt_replace tmp; | |
1270 | struct xt_table_info *newinfo; | |
1271 | void *loc_cpu_entry; | |
1272 | ||
1273 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1274 | return -EFAULT; | |
1275 | ||
2722971c | 1276 | /* overflow check */ |
2722971c DM |
1277 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1278 | return -ENOMEM; | |
1279 | ||
1280 | newinfo = xt_alloc_table_info(tmp.size); | |
1281 | if (!newinfo) | |
1282 | return -ENOMEM; | |
1283 | ||
9c547959 | 1284 | /* choose the copy that is on our node/cpu */ |
2722971c DM |
1285 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1286 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1287 | tmp.size) != 0) { | |
1288 | ret = -EFAULT; | |
1289 | goto free_newinfo; | |
1290 | } | |
1291 | ||
1292 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
1293 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, | |
1294 | tmp.hook_entry, tmp.underflow); | |
1295 | if (ret != 0) | |
1296 | goto free_newinfo; | |
1297 | ||
1298 | duprintf("ip_tables: Translated table\n"); | |
1299 | ||
34bd137b | 1300 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1301 | tmp.num_counters, tmp.counters); |
2722971c DM |
1302 | if (ret) |
1303 | goto free_newinfo_untrans; | |
1304 | return 0; | |
1305 | ||
1306 | free_newinfo_untrans: | |
9c547959 | 1307 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
2722971c DM |
1308 | free_newinfo: |
1309 | xt_free_table_info(newinfo); | |
1310 | return ret; | |
1311 | } | |
1312 | ||
942e4a2b SH |
1313 | /* We're lazy, and add to the first CPU; overflow works its fey magic |
1314 | * and everything is OK. */ | |
1315 | static int | |
1316 | add_counter_to_entry(struct ipt_entry *e, | |
1317 | const struct xt_counters addme[], | |
1318 | unsigned int *i) | |
1319 | { | |
1320 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1321 | ||
1322 | (*i)++; | |
1323 | return 0; | |
1324 | } | |
2722971c DM |
1325 | |
1326 | static int | |
34bd137b | 1327 | do_add_counters(struct net *net, void __user *user, unsigned int len, int compat) |
2722971c | 1328 | { |
942e4a2b | 1329 | unsigned int i, curcpu; |
2722971c DM |
1330 | struct xt_counters_info tmp; |
1331 | struct xt_counters *paddc; | |
1332 | unsigned int num_counters; | |
5452e425 | 1333 | const char *name; |
2722971c DM |
1334 | int size; |
1335 | void *ptmp; | |
e60a13e0 | 1336 | struct xt_table *t; |
5452e425 | 1337 | const struct xt_table_info *private; |
2722971c DM |
1338 | int ret = 0; |
1339 | void *loc_cpu_entry; | |
1340 | #ifdef CONFIG_COMPAT | |
1341 | struct compat_xt_counters_info compat_tmp; | |
1342 | ||
1343 | if (compat) { | |
1344 | ptmp = &compat_tmp; | |
1345 | size = sizeof(struct compat_xt_counters_info); | |
1346 | } else | |
1347 | #endif | |
1348 | { | |
1349 | ptmp = &tmp; | |
1350 | size = sizeof(struct xt_counters_info); | |
1351 | } | |
1352 | ||
1353 | if (copy_from_user(ptmp, user, size) != 0) | |
1354 | return -EFAULT; | |
1355 | ||
1356 | #ifdef CONFIG_COMPAT | |
1357 | if (compat) { | |
1358 | num_counters = compat_tmp.num_counters; | |
1359 | name = compat_tmp.name; | |
1360 | } else | |
1361 | #endif | |
1362 | { | |
1363 | num_counters = tmp.num_counters; | |
1364 | name = tmp.name; | |
1365 | } | |
1366 | ||
1367 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1368 | return -EINVAL; | |
1369 | ||
1370 | paddc = vmalloc_node(len - size, numa_node_id()); | |
1371 | if (!paddc) | |
1372 | return -ENOMEM; | |
1373 | ||
1374 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1375 | ret = -EFAULT; | |
1376 | goto free; | |
1377 | } | |
1378 | ||
34bd137b | 1379 | t = xt_find_table_lock(net, AF_INET, name); |
2722971c DM |
1380 | if (!t || IS_ERR(t)) { |
1381 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1382 | goto free; | |
1383 | } | |
1384 | ||
942e4a2b | 1385 | local_bh_disable(); |
2722971c DM |
1386 | private = t->private; |
1387 | if (private->number != num_counters) { | |
1388 | ret = -EINVAL; | |
1389 | goto unlock_up_free; | |
1390 | } | |
1391 | ||
1392 | i = 0; | |
1393 | /* Choose the copy that is on our node */ | |
942e4a2b SH |
1394 | curcpu = smp_processor_id(); |
1395 | loc_cpu_entry = private->entries[curcpu]; | |
1396 | xt_info_wrlock(curcpu); | |
2722971c DM |
1397 | IPT_ENTRY_ITERATE(loc_cpu_entry, |
1398 | private->size, | |
1399 | add_counter_to_entry, | |
1400 | paddc, | |
1401 | &i); | |
942e4a2b | 1402 | xt_info_wrunlock(curcpu); |
2722971c | 1403 | unlock_up_free: |
942e4a2b | 1404 | local_bh_enable(); |
2722971c DM |
1405 | xt_table_unlock(t); |
1406 | module_put(t->me); | |
1407 | free: | |
1408 | vfree(paddc); | |
1409 | ||
1410 | return ret; | |
1411 | } | |
1412 | ||
1413 | #ifdef CONFIG_COMPAT | |
1414 | struct compat_ipt_replace { | |
1415 | char name[IPT_TABLE_MAXNAMELEN]; | |
1416 | u32 valid_hooks; | |
1417 | u32 num_entries; | |
1418 | u32 size; | |
6e23ae2a PM |
1419 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1420 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c DM |
1421 | u32 num_counters; |
1422 | compat_uptr_t counters; /* struct ipt_counters * */ | |
1423 | struct compat_ipt_entry entries[0]; | |
1424 | }; | |
1425 | ||
a18aa31b PM |
1426 | static int |
1427 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1428 | unsigned int *size, struct xt_counters *counters, |
a18aa31b | 1429 | unsigned int *i) |
2722971c | 1430 | { |
3e597c60 | 1431 | struct ipt_entry_target *t; |
2722971c DM |
1432 | struct compat_ipt_entry __user *ce; |
1433 | u_int16_t target_offset, next_offset; | |
1434 | compat_uint_t origsize; | |
1435 | int ret; | |
1436 | ||
1437 | ret = -EFAULT; | |
1438 | origsize = *size; | |
1439 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
7800007c | 1440 | if (copy_to_user(ce, e, sizeof(struct ipt_entry))) |
2722971c DM |
1441 | goto out; |
1442 | ||
a18aa31b PM |
1443 | if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i]))) |
1444 | goto out; | |
1445 | ||
2722971c | 1446 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1447 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1448 | ||
ac8e27fd | 1449 | ret = IPT_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size); |
2722971c DM |
1450 | target_offset = e->target_offset - (origsize - *size); |
1451 | if (ret) | |
1452 | goto out; | |
1453 | t = ipt_get_target(e); | |
9fa492cd | 1454 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c DM |
1455 | if (ret) |
1456 | goto out; | |
1457 | ret = -EFAULT; | |
1458 | next_offset = e->next_offset - (origsize - *size); | |
7800007c | 1459 | if (put_user(target_offset, &ce->target_offset)) |
2722971c | 1460 | goto out; |
7800007c | 1461 | if (put_user(next_offset, &ce->next_offset)) |
2722971c | 1462 | goto out; |
a18aa31b PM |
1463 | |
1464 | (*i)++; | |
2722971c DM |
1465 | return 0; |
1466 | out: | |
1467 | return ret; | |
1468 | } | |
1469 | ||
022748a9 | 1470 | static int |
4c1b52bc | 1471 | compat_find_calc_match(struct ipt_entry_match *m, |
4b478248 PM |
1472 | const char *name, |
1473 | const struct ipt_ip *ip, | |
1474 | unsigned int hookmask, | |
b0a6363c | 1475 | int *size, unsigned int *i) |
2722971c | 1476 | { |
6709dbbb | 1477 | struct xt_match *match; |
2722971c DM |
1478 | |
1479 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, | |
4b478248 | 1480 | m->u.user.revision), |
2722971c DM |
1481 | "ipt_%s", m->u.user.name); |
1482 | if (IS_ERR(match) || !match) { | |
1483 | duprintf("compat_check_calc_match: `%s' not found\n", | |
4b478248 | 1484 | m->u.user.name); |
2722971c DM |
1485 | return match ? PTR_ERR(match) : -ENOENT; |
1486 | } | |
1487 | m->u.kernel.match = match; | |
9fa492cd | 1488 | *size += xt_compat_match_offset(match); |
2722971c DM |
1489 | |
1490 | (*i)++; | |
1491 | return 0; | |
1492 | } | |
1493 | ||
022748a9 | 1494 | static int |
4c1b52bc DM |
1495 | compat_release_match(struct ipt_entry_match *m, unsigned int *i) |
1496 | { | |
1497 | if (i && (*i)-- == 0) | |
1498 | return 1; | |
1499 | ||
1500 | module_put(m->u.kernel.match->me); | |
1501 | return 0; | |
1502 | } | |
1503 | ||
022748a9 | 1504 | static int |
73cd598d | 1505 | compat_release_entry(struct compat_ipt_entry *e, unsigned int *i) |
4c1b52bc DM |
1506 | { |
1507 | struct ipt_entry_target *t; | |
1508 | ||
1509 | if (i && (*i)-- == 0) | |
1510 | return 1; | |
1511 | ||
1512 | /* Cleanup all matches */ | |
73cd598d PM |
1513 | COMPAT_IPT_MATCH_ITERATE(e, compat_release_match, NULL); |
1514 | t = compat_ipt_get_target(e); | |
4c1b52bc DM |
1515 | module_put(t->u.kernel.target->me); |
1516 | return 0; | |
1517 | } | |
1518 | ||
022748a9 | 1519 | static int |
73cd598d | 1520 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1521 | struct xt_table_info *newinfo, |
1522 | unsigned int *size, | |
1523 | unsigned char *base, | |
1524 | unsigned char *limit, | |
1525 | unsigned int *hook_entries, | |
1526 | unsigned int *underflows, | |
1527 | unsigned int *i, | |
1528 | const char *name) | |
2722971c DM |
1529 | { |
1530 | struct ipt_entry_target *t; | |
6709dbbb | 1531 | struct xt_target *target; |
e5b5ef7d | 1532 | unsigned int entry_offset; |
b0a6363c PM |
1533 | unsigned int j; |
1534 | int ret, off, h; | |
2722971c DM |
1535 | |
1536 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
1537 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 | |
1538 | || (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { | |
1539 | duprintf("Bad offset %p, limit = %p\n", e, limit); | |
1540 | return -EINVAL; | |
1541 | } | |
1542 | ||
1543 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1544 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1545 | duprintf("checking: element %p size %u\n", |
1546 | e, e->next_offset); | |
1547 | return -EINVAL; | |
1548 | } | |
1549 | ||
73cd598d PM |
1550 | /* For purposes of check_entry casting the compat entry is fine */ |
1551 | ret = check_entry((struct ipt_entry *)e, name); | |
a96be246 DM |
1552 | if (ret) |
1553 | return ret; | |
590bdf7f | 1554 | |
30c08c41 | 1555 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1556 | entry_offset = (void *)e - (void *)base; |
1557 | j = 0; | |
73cd598d PM |
1558 | ret = COMPAT_IPT_MATCH_ITERATE(e, compat_find_calc_match, name, |
1559 | &e->ip, e->comefrom, &off, &j); | |
2722971c | 1560 | if (ret != 0) |
4c1b52bc | 1561 | goto release_matches; |
2722971c | 1562 | |
73cd598d | 1563 | t = compat_ipt_get_target(e); |
2722971c | 1564 | target = try_then_request_module(xt_find_target(AF_INET, |
4b478248 PM |
1565 | t->u.user.name, |
1566 | t->u.user.revision), | |
2722971c DM |
1567 | "ipt_%s", t->u.user.name); |
1568 | if (IS_ERR(target) || !target) { | |
a96be246 | 1569 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1570 | t->u.user.name); |
2722971c | 1571 | ret = target ? PTR_ERR(target) : -ENOENT; |
4c1b52bc | 1572 | goto release_matches; |
2722971c DM |
1573 | } |
1574 | t->u.kernel.target = target; | |
1575 | ||
9fa492cd | 1576 | off += xt_compat_target_offset(target); |
2722971c | 1577 | *size += off; |
b386d9f5 | 1578 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1579 | if (ret) |
1580 | goto out; | |
1581 | ||
1582 | /* Check hooks & underflows */ | |
6e23ae2a | 1583 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1584 | if ((unsigned char *)e - base == hook_entries[h]) |
1585 | newinfo->hook_entry[h] = hook_entries[h]; | |
1586 | if ((unsigned char *)e - base == underflows[h]) | |
1587 | newinfo->underflow[h] = underflows[h]; | |
1588 | } | |
1589 | ||
1590 | /* Clear counters and comefrom */ | |
73cd598d | 1591 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c DM |
1592 | e->comefrom = 0; |
1593 | ||
1594 | (*i)++; | |
1595 | return 0; | |
bec71b16 | 1596 | |
2722971c | 1597 | out: |
bec71b16 | 1598 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1599 | release_matches: |
1600 | IPT_MATCH_ITERATE(e, compat_release_match, &j); | |
2722971c DM |
1601 | return ret; |
1602 | } | |
1603 | ||
4b478248 | 1604 | static int |
73cd598d | 1605 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1606 | unsigned int *size, const char *name, |
1607 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c DM |
1608 | { |
1609 | struct ipt_entry_target *t; | |
6709dbbb | 1610 | struct xt_target *target; |
2722971c DM |
1611 | struct ipt_entry *de; |
1612 | unsigned int origsize; | |
920b868a | 1613 | int ret, h; |
2722971c DM |
1614 | |
1615 | ret = 0; | |
1616 | origsize = *size; | |
1617 | de = (struct ipt_entry *)*dstptr; | |
1618 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1619 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1620 | |
73cd598d | 1621 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1622 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1623 | ||
73cd598d PM |
1624 | ret = COMPAT_IPT_MATCH_ITERATE(e, xt_compat_match_from_user, |
1625 | dstptr, size); | |
2722971c | 1626 | if (ret) |
f6677f43 | 1627 | return ret; |
2722971c | 1628 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1629 | t = compat_ipt_get_target(e); |
2722971c | 1630 | target = t->u.kernel.target; |
9fa492cd | 1631 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1632 | |
1633 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1634 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1635 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1636 | newinfo->hook_entry[h] -= origsize - *size; | |
1637 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1638 | newinfo->underflow[h] -= origsize - *size; | |
1639 | } | |
f6677f43 DM |
1640 | return ret; |
1641 | } | |
1642 | ||
022748a9 DV |
1643 | static int |
1644 | compat_check_entry(struct ipt_entry *e, const char *name, | |
4b478248 | 1645 | unsigned int *i) |
f6677f43 | 1646 | { |
9b4fce7a | 1647 | struct xt_mtchk_param mtpar; |
b0a6363c PM |
1648 | unsigned int j; |
1649 | int ret; | |
f6677f43 | 1650 | |
4c1b52bc | 1651 | j = 0; |
9b4fce7a JE |
1652 | mtpar.table = name; |
1653 | mtpar.entryinfo = &e->ip; | |
1654 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1655 | mtpar.family = NFPROTO_IPV4; |
9b4fce7a | 1656 | ret = IPT_MATCH_ITERATE(e, check_match, &mtpar, &j); |
f6677f43 | 1657 | if (ret) |
4c1b52bc DM |
1658 | goto cleanup_matches; |
1659 | ||
1660 | ret = check_target(e, name); | |
1661 | if (ret) | |
1662 | goto cleanup_matches; | |
f6677f43 | 1663 | |
4c1b52bc DM |
1664 | (*i)++; |
1665 | return 0; | |
1666 | ||
1667 | cleanup_matches: | |
1668 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
1669 | return ret; | |
f6677f43 DM |
1670 | } |
1671 | ||
1da177e4 | 1672 | static int |
2722971c | 1673 | translate_compat_table(const char *name, |
4b478248 PM |
1674 | unsigned int valid_hooks, |
1675 | struct xt_table_info **pinfo, | |
1676 | void **pentry0, | |
1677 | unsigned int total_size, | |
1678 | unsigned int number, | |
1679 | unsigned int *hook_entries, | |
1680 | unsigned int *underflows) | |
1da177e4 | 1681 | { |
920b868a | 1682 | unsigned int i, j; |
2722971c DM |
1683 | struct xt_table_info *newinfo, *info; |
1684 | void *pos, *entry0, *entry1; | |
1685 | unsigned int size; | |
1da177e4 | 1686 | int ret; |
1da177e4 | 1687 | |
2722971c DM |
1688 | info = *pinfo; |
1689 | entry0 = *pentry0; | |
1690 | size = total_size; | |
1691 | info->number = number; | |
1692 | ||
1693 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1694 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1695 | info->hook_entry[i] = 0xFFFFFFFF; |
1696 | info->underflow[i] = 0xFFFFFFFF; | |
1697 | } | |
1698 | ||
1699 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1700 | j = 0; |
2722971c DM |
1701 | xt_compat_lock(AF_INET); |
1702 | /* Walk through entries, checking offsets. */ | |
73cd598d PM |
1703 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
1704 | check_compat_entry_size_and_hooks, | |
1705 | info, &size, entry0, | |
1706 | entry0 + total_size, | |
1707 | hook_entries, underflows, &j, name); | |
2722971c DM |
1708 | if (ret != 0) |
1709 | goto out_unlock; | |
1710 | ||
1711 | ret = -EINVAL; | |
920b868a | 1712 | if (j != number) { |
2722971c | 1713 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1714 | j, number); |
2722971c DM |
1715 | goto out_unlock; |
1716 | } | |
1717 | ||
1718 | /* Check hooks all assigned */ | |
6e23ae2a | 1719 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1720 | /* Only hooks which are valid */ |
1721 | if (!(valid_hooks & (1 << i))) | |
1722 | continue; | |
1723 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1724 | duprintf("Invalid hook entry %u %u\n", | |
1725 | i, hook_entries[i]); | |
1726 | goto out_unlock; | |
1da177e4 | 1727 | } |
2722971c DM |
1728 | if (info->underflow[i] == 0xFFFFFFFF) { |
1729 | duprintf("Invalid underflow %u %u\n", | |
1730 | i, underflows[i]); | |
1731 | goto out_unlock; | |
1732 | } | |
1733 | } | |
1734 | ||
1735 | ret = -ENOMEM; | |
1736 | newinfo = xt_alloc_table_info(size); | |
1737 | if (!newinfo) | |
1738 | goto out_unlock; | |
1739 | ||
1740 | newinfo->number = number; | |
6e23ae2a | 1741 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1742 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1743 | newinfo->underflow[i] = info->underflow[i]; | |
1744 | } | |
1745 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1746 | pos = entry1; | |
4b478248 | 1747 | size = total_size; |
73cd598d | 1748 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
9c547959 PM |
1749 | compat_copy_entry_from_user, |
1750 | &pos, &size, name, newinfo, entry1); | |
b386d9f5 | 1751 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1752 | xt_compat_unlock(AF_INET); |
1753 | if (ret) | |
1754 | goto free_newinfo; | |
1755 | ||
1756 | ret = -ELOOP; | |
1757 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1758 | goto free_newinfo; | |
1759 | ||
4c1b52bc | 1760 | i = 0; |
f6677f43 | 1761 | ret = IPT_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry, |
4b478248 | 1762 | name, &i); |
4c1b52bc DM |
1763 | if (ret) { |
1764 | j -= i; | |
73cd598d PM |
1765 | COMPAT_IPT_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i, |
1766 | compat_release_entry, &j); | |
4c1b52bc DM |
1767 | IPT_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i); |
1768 | xt_free_table_info(newinfo); | |
1769 | return ret; | |
1770 | } | |
f6677f43 | 1771 | |
2722971c | 1772 | /* And one copy for every other CPU */ |
fb1bb34d | 1773 | for_each_possible_cpu(i) |
2722971c DM |
1774 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1775 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1776 | ||
1777 | *pinfo = newinfo; | |
1778 | *pentry0 = entry1; | |
1779 | xt_free_table_info(info); | |
1780 | return 0; | |
1da177e4 | 1781 | |
2722971c DM |
1782 | free_newinfo: |
1783 | xt_free_table_info(newinfo); | |
1784 | out: | |
73cd598d | 1785 | COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j); |
1da177e4 | 1786 | return ret; |
2722971c | 1787 | out_unlock: |
b386d9f5 | 1788 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1789 | xt_compat_unlock(AF_INET); |
1790 | goto out; | |
1da177e4 LT |
1791 | } |
1792 | ||
1793 | static int | |
34bd137b | 1794 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1795 | { |
1796 | int ret; | |
2722971c DM |
1797 | struct compat_ipt_replace tmp; |
1798 | struct xt_table_info *newinfo; | |
1799 | void *loc_cpu_entry; | |
1da177e4 LT |
1800 | |
1801 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1802 | return -EFAULT; | |
1803 | ||
ee4bb818 | 1804 | /* overflow check */ |
259d4e41 | 1805 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1806 | return -ENOMEM; |
1807 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1808 | return -ENOMEM; | |
1809 | ||
2e4e6a17 | 1810 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1811 | if (!newinfo) |
1812 | return -ENOMEM; | |
1813 | ||
9c547959 | 1814 | /* choose the copy that is on our node/cpu */ |
31836064 ED |
1815 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1816 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1817 | tmp.size) != 0) { |
1818 | ret = -EFAULT; | |
1819 | goto free_newinfo; | |
1820 | } | |
1821 | ||
2722971c | 1822 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, |
4b478248 PM |
1823 | &newinfo, &loc_cpu_entry, tmp.size, |
1824 | tmp.num_entries, tmp.hook_entry, | |
1825 | tmp.underflow); | |
2722971c | 1826 | if (ret != 0) |
1da177e4 | 1827 | goto free_newinfo; |
1da177e4 | 1828 | |
2722971c | 1829 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1830 | |
34bd137b | 1831 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1832 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1833 | if (ret) |
1834 | goto free_newinfo_untrans; | |
1835 | return 0; | |
1da177e4 | 1836 | |
2722971c | 1837 | free_newinfo_untrans: |
4b478248 | 1838 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
2722971c DM |
1839 | free_newinfo: |
1840 | xt_free_table_info(newinfo); | |
1841 | return ret; | |
1842 | } | |
1da177e4 | 1843 | |
2722971c DM |
1844 | static int |
1845 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1846 | unsigned int len) |
2722971c DM |
1847 | { |
1848 | int ret; | |
1da177e4 | 1849 | |
2722971c DM |
1850 | if (!capable(CAP_NET_ADMIN)) |
1851 | return -EPERM; | |
1da177e4 | 1852 | |
2722971c DM |
1853 | switch (cmd) { |
1854 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1855 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1856 | break; |
1da177e4 | 1857 | |
2722971c | 1858 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1859 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1860 | break; |
1861 | ||
1862 | default: | |
1863 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1864 | ret = -EINVAL; | |
1865 | } | |
1da177e4 | 1866 | |
1da177e4 LT |
1867 | return ret; |
1868 | } | |
1869 | ||
4b478248 | 1870 | struct compat_ipt_get_entries { |
2722971c DM |
1871 | char name[IPT_TABLE_MAXNAMELEN]; |
1872 | compat_uint_t size; | |
1873 | struct compat_ipt_entry entrytable[0]; | |
1874 | }; | |
1da177e4 | 1875 | |
4b478248 PM |
1876 | static int |
1877 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1878 | void __user *userptr) | |
2722971c | 1879 | { |
2722971c | 1880 | struct xt_counters *counters; |
5452e425 | 1881 | const struct xt_table_info *private = table->private; |
2722971c DM |
1882 | void __user *pos; |
1883 | unsigned int size; | |
1884 | int ret = 0; | |
5452e425 | 1885 | const void *loc_cpu_entry; |
a18aa31b | 1886 | unsigned int i = 0; |
1da177e4 | 1887 | |
2722971c DM |
1888 | counters = alloc_counters(table); |
1889 | if (IS_ERR(counters)) | |
1890 | return PTR_ERR(counters); | |
1891 | ||
1892 | /* choose the copy that is on our node/cpu, ... | |
1893 | * This choice is lazy (because current thread is | |
1894 | * allowed to migrate to another cpu) | |
1895 | */ | |
1896 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1897 | pos = userptr; | |
1898 | size = total_size; | |
1899 | ret = IPT_ENTRY_ITERATE(loc_cpu_entry, total_size, | |
a18aa31b PM |
1900 | compat_copy_entry_to_user, |
1901 | &pos, &size, counters, &i); | |
2722971c | 1902 | |
2722971c DM |
1903 | vfree(counters); |
1904 | return ret; | |
1da177e4 LT |
1905 | } |
1906 | ||
1907 | static int | |
34bd137b AD |
1908 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1909 | int *len) | |
1da177e4 | 1910 | { |
2722971c DM |
1911 | int ret; |
1912 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1913 | struct xt_table *t; |
1da177e4 | 1914 | |
2722971c | 1915 | if (*len < sizeof(get)) { |
c9d8fe13 | 1916 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1917 | return -EINVAL; |
2722971c | 1918 | } |
1da177e4 | 1919 | |
2722971c DM |
1920 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1921 | return -EFAULT; | |
1da177e4 | 1922 | |
2722971c | 1923 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1924 | duprintf("compat_get_entries: %u != %zu\n", |
1925 | *len, sizeof(get) + get.size); | |
2722971c | 1926 | return -EINVAL; |
1da177e4 LT |
1927 | } |
1928 | ||
2722971c | 1929 | xt_compat_lock(AF_INET); |
34bd137b | 1930 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1931 | if (t && !IS_ERR(t)) { |
5452e425 | 1932 | const struct xt_table_info *private = t->private; |
2722971c | 1933 | struct xt_table_info info; |
9c547959 | 1934 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1935 | ret = compat_table_info(private, &info); |
1936 | if (!ret && get.size == info.size) { | |
1937 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 1938 | t, uptr->entrytable); |
2722971c DM |
1939 | } else if (!ret) { |
1940 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1941 | private->size, get.size); |
544473c1 | 1942 | ret = -EAGAIN; |
2722971c | 1943 | } |
b386d9f5 | 1944 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1945 | module_put(t->me); |
1946 | xt_table_unlock(t); | |
1947 | } else | |
1da177e4 | 1948 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1949 | |
2722971c DM |
1950 | xt_compat_unlock(AF_INET); |
1951 | return ret; | |
1952 | } | |
1da177e4 | 1953 | |
79030ed0 PM |
1954 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1955 | ||
2722971c DM |
1956 | static int |
1957 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1958 | { | |
1959 | int ret; | |
1da177e4 | 1960 | |
82fac054 BS |
1961 | if (!capable(CAP_NET_ADMIN)) |
1962 | return -EPERM; | |
1963 | ||
2722971c DM |
1964 | switch (cmd) { |
1965 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1966 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1967 | break; |
1968 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1969 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1970 | break; |
1971 | default: | |
79030ed0 | 1972 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1973 | } |
1da177e4 LT |
1974 | return ret; |
1975 | } | |
2722971c | 1976 | #endif |
1da177e4 LT |
1977 | |
1978 | static int | |
9c547959 | 1979 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
1980 | { |
1981 | int ret; | |
1982 | ||
1983 | if (!capable(CAP_NET_ADMIN)) | |
1984 | return -EPERM; | |
1985 | ||
1986 | switch (cmd) { | |
1987 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1988 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1989 | break; |
1990 | ||
1991 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1992 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
1993 | break; |
1994 | ||
1995 | default: | |
1996 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1997 | ret = -EINVAL; | |
1998 | } | |
1999 | ||
2000 | return ret; | |
2001 | } | |
2002 | ||
2003 | static int | |
2004 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2005 | { | |
2006 | int ret; | |
2007 | ||
2008 | if (!capable(CAP_NET_ADMIN)) | |
2009 | return -EPERM; | |
2010 | ||
2011 | switch (cmd) { | |
2722971c | 2012 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2013 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2014 | break; |
1da177e4 | 2015 | |
2722971c | 2016 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2017 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2018 | break; |
1da177e4 LT |
2019 | |
2020 | case IPT_SO_GET_REVISION_MATCH: | |
2021 | case IPT_SO_GET_REVISION_TARGET: { | |
2022 | struct ipt_get_revision rev; | |
2e4e6a17 | 2023 | int target; |
1da177e4 LT |
2024 | |
2025 | if (*len != sizeof(rev)) { | |
2026 | ret = -EINVAL; | |
2027 | break; | |
2028 | } | |
2029 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2030 | ret = -EFAULT; | |
2031 | break; | |
2032 | } | |
2033 | ||
2034 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2035 | target = 1; |
1da177e4 | 2036 | else |
2e4e6a17 | 2037 | target = 0; |
1da177e4 | 2038 | |
2e4e6a17 HW |
2039 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2040 | rev.revision, | |
2041 | target, &ret), | |
1da177e4 LT |
2042 | "ipt_%s", rev.name); |
2043 | break; | |
2044 | } | |
2045 | ||
2046 | default: | |
2047 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2048 | ret = -EINVAL; | |
2049 | } | |
2050 | ||
2051 | return ret; | |
2052 | } | |
2053 | ||
44d34e72 AD |
2054 | struct xt_table *ipt_register_table(struct net *net, struct xt_table *table, |
2055 | const struct ipt_replace *repl) | |
1da177e4 LT |
2056 | { |
2057 | int ret; | |
2e4e6a17 | 2058 | struct xt_table_info *newinfo; |
259d4e41 | 2059 | struct xt_table_info bootstrap |
1da177e4 | 2060 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2061 | void *loc_cpu_entry; |
a98da11d | 2062 | struct xt_table *new_table; |
1da177e4 | 2063 | |
2e4e6a17 | 2064 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2065 | if (!newinfo) { |
2066 | ret = -ENOMEM; | |
2067 | goto out; | |
2068 | } | |
1da177e4 | 2069 | |
9c547959 | 2070 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2071 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2072 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
2073 | |
2074 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 2075 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
2076 | repl->num_entries, |
2077 | repl->hook_entry, | |
2078 | repl->underflow); | |
44d34e72 AD |
2079 | if (ret != 0) |
2080 | goto out_free; | |
1da177e4 | 2081 | |
44d34e72 | 2082 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2083 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2084 | ret = PTR_ERR(new_table); |
2085 | goto out_free; | |
1da177e4 LT |
2086 | } |
2087 | ||
44d34e72 AD |
2088 | return new_table; |
2089 | ||
2090 | out_free: | |
2091 | xt_free_table_info(newinfo); | |
2092 | out: | |
2093 | return ERR_PTR(ret); | |
1da177e4 LT |
2094 | } |
2095 | ||
e60a13e0 | 2096 | void ipt_unregister_table(struct xt_table *table) |
1da177e4 | 2097 | { |
2e4e6a17 | 2098 | struct xt_table_info *private; |
31836064 | 2099 | void *loc_cpu_entry; |
df200969 | 2100 | struct module *table_owner = table->me; |
31836064 | 2101 | |
e905a9ed | 2102 | private = xt_unregister_table(table); |
1da177e4 LT |
2103 | |
2104 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
2105 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
2106 | IPT_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
df200969 AD |
2107 | if (private->number > private->initial_entries) |
2108 | module_put(table_owner); | |
2e4e6a17 | 2109 | xt_free_table_info(private); |
1da177e4 LT |
2110 | } |
2111 | ||
2112 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2113 | static inline bool |
1da177e4 LT |
2114 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2115 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2116 | bool invert) |
1da177e4 | 2117 | { |
9c547959 PM |
2118 | return ((test_type == 0xFF) || |
2119 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2120 | ^ invert; |
2121 | } | |
2122 | ||
1d93a9cb | 2123 | static bool |
f7108a20 | 2124 | icmp_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2125 | { |
5452e425 JE |
2126 | const struct icmphdr *ic; |
2127 | struct icmphdr _icmph; | |
f7108a20 | 2128 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2129 | |
2130 | /* Must not be a fragment. */ | |
f7108a20 | 2131 | if (par->fragoff != 0) |
1d93a9cb | 2132 | return false; |
1da177e4 | 2133 | |
f7108a20 | 2134 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2135 | if (ic == NULL) { |
2136 | /* We've been asked to examine this packet, and we | |
2137 | * can't. Hence, no choice but to drop. | |
2138 | */ | |
2139 | duprintf("Dropping evil ICMP tinygram.\n"); | |
f7108a20 | 2140 | *par->hotdrop = true; |
1d93a9cb | 2141 | return false; |
1da177e4 LT |
2142 | } |
2143 | ||
2144 | return icmp_type_code_match(icmpinfo->type, | |
2145 | icmpinfo->code[0], | |
2146 | icmpinfo->code[1], | |
2147 | ic->type, ic->code, | |
2148 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2149 | } | |
2150 | ||
9b4fce7a | 2151 | static bool icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2152 | { |
9b4fce7a | 2153 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2154 | |
1d5cd909 PM |
2155 | /* Must specify no unknown invflags */ |
2156 | return !(icmpinfo->invflags & ~IPT_ICMP_INV); | |
1da177e4 LT |
2157 | } |
2158 | ||
2159 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2160 | static struct xt_target ipt_standard_target __read_mostly = { |
1da177e4 | 2161 | .name = IPT_STANDARD_TARGET, |
1d5cd909 | 2162 | .targetsize = sizeof(int), |
4ba351cf | 2163 | .family = NFPROTO_IPV4, |
2722971c | 2164 | #ifdef CONFIG_COMPAT |
9fa492cd PM |
2165 | .compatsize = sizeof(compat_int_t), |
2166 | .compat_from_user = compat_standard_from_user, | |
2167 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2168 | #endif |
1da177e4 LT |
2169 | }; |
2170 | ||
9f15c530 | 2171 | static struct xt_target ipt_error_target __read_mostly = { |
1da177e4 LT |
2172 | .name = IPT_ERROR_TARGET, |
2173 | .target = ipt_error, | |
1d5cd909 | 2174 | .targetsize = IPT_FUNCTION_MAXNAMELEN, |
4ba351cf | 2175 | .family = NFPROTO_IPV4, |
1da177e4 LT |
2176 | }; |
2177 | ||
2178 | static struct nf_sockopt_ops ipt_sockopts = { | |
2179 | .pf = PF_INET, | |
2180 | .set_optmin = IPT_BASE_CTL, | |
2181 | .set_optmax = IPT_SO_SET_MAX+1, | |
2182 | .set = do_ipt_set_ctl, | |
2722971c DM |
2183 | #ifdef CONFIG_COMPAT |
2184 | .compat_set = compat_do_ipt_set_ctl, | |
2185 | #endif | |
1da177e4 LT |
2186 | .get_optmin = IPT_BASE_CTL, |
2187 | .get_optmax = IPT_SO_GET_MAX+1, | |
2188 | .get = do_ipt_get_ctl, | |
2722971c DM |
2189 | #ifdef CONFIG_COMPAT |
2190 | .compat_get = compat_do_ipt_get_ctl, | |
2191 | #endif | |
16fcec35 | 2192 | .owner = THIS_MODULE, |
1da177e4 LT |
2193 | }; |
2194 | ||
9f15c530 | 2195 | static struct xt_match icmp_matchstruct __read_mostly = { |
1da177e4 | 2196 | .name = "icmp", |
1d5cd909 PM |
2197 | .match = icmp_match, |
2198 | .matchsize = sizeof(struct ipt_icmp), | |
9c547959 | 2199 | .checkentry = icmp_checkentry, |
1d5cd909 | 2200 | .proto = IPPROTO_ICMP, |
4ba351cf | 2201 | .family = NFPROTO_IPV4, |
1da177e4 LT |
2202 | }; |
2203 | ||
3cb609d5 AD |
2204 | static int __net_init ip_tables_net_init(struct net *net) |
2205 | { | |
383ca5b8 | 2206 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
2207 | } |
2208 | ||
2209 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2210 | { | |
383ca5b8 | 2211 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
2212 | } |
2213 | ||
2214 | static struct pernet_operations ip_tables_net_ops = { | |
2215 | .init = ip_tables_net_init, | |
2216 | .exit = ip_tables_net_exit, | |
2217 | }; | |
2218 | ||
65b4b4e8 | 2219 | static int __init ip_tables_init(void) |
1da177e4 LT |
2220 | { |
2221 | int ret; | |
2222 | ||
3cb609d5 | 2223 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2224 | if (ret < 0) |
2225 | goto err1; | |
2e4e6a17 | 2226 | |
1da177e4 | 2227 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2228 | ret = xt_register_target(&ipt_standard_target); |
2229 | if (ret < 0) | |
2230 | goto err2; | |
2231 | ret = xt_register_target(&ipt_error_target); | |
2232 | if (ret < 0) | |
2233 | goto err3; | |
2234 | ret = xt_register_match(&icmp_matchstruct); | |
2235 | if (ret < 0) | |
2236 | goto err4; | |
1da177e4 LT |
2237 | |
2238 | /* Register setsockopt */ | |
2239 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2240 | if (ret < 0) |
2241 | goto err5; | |
1da177e4 | 2242 | |
0236e667 | 2243 | printk(KERN_INFO "ip_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2244 | return 0; |
0eff66e6 PM |
2245 | |
2246 | err5: | |
2247 | xt_unregister_match(&icmp_matchstruct); | |
2248 | err4: | |
2249 | xt_unregister_target(&ipt_error_target); | |
2250 | err3: | |
2251 | xt_unregister_target(&ipt_standard_target); | |
2252 | err2: | |
3cb609d5 | 2253 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2254 | err1: |
2255 | return ret; | |
1da177e4 LT |
2256 | } |
2257 | ||
65b4b4e8 | 2258 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2259 | { |
2260 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2261 | |
a45049c5 PNA |
2262 | xt_unregister_match(&icmp_matchstruct); |
2263 | xt_unregister_target(&ipt_error_target); | |
2264 | xt_unregister_target(&ipt_standard_target); | |
2e4e6a17 | 2265 | |
3cb609d5 | 2266 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2267 | } |
2268 | ||
2269 | EXPORT_SYMBOL(ipt_register_table); | |
2270 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2271 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2272 | module_init(ip_tables_init); |
2273 | module_exit(ip_tables_fini); |