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