Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Packet matching code. | |
3 | * | |
4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
2e4e6a17 | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
1da177e4 | 10 | */ |
90e7d4ab | 11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
1da177e4 | 12 | #include <linux/cache.h> |
4fc268d2 | 13 | #include <linux/capability.h> |
1da177e4 LT |
14 | #include <linux/skbuff.h> |
15 | #include <linux/kmod.h> | |
16 | #include <linux/vmalloc.h> | |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/module.h> | |
1da177e4 LT |
19 | #include <linux/icmp.h> |
20 | #include <net/ip.h> | |
2722971c | 21 | #include <net/compat.h> |
1da177e4 | 22 | #include <asm/uaccess.h> |
57b47a53 | 23 | #include <linux/mutex.h> |
1da177e4 LT |
24 | #include <linux/proc_fs.h> |
25 | #include <linux/err.h> | |
c8923c6b | 26 | #include <linux/cpumask.h> |
1da177e4 | 27 | |
2e4e6a17 | 28 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 29 | #include <linux/netfilter_ipv4/ip_tables.h> |
f01ffbd6 | 30 | #include <net/netfilter/nf_log.h> |
1da177e4 LT |
31 | |
32 | MODULE_LICENSE("GPL"); | |
33 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
34 | MODULE_DESCRIPTION("IPv4 packet filter"); | |
35 | ||
36 | /*#define DEBUG_IP_FIREWALL*/ | |
37 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
38 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
39 | ||
40 | #ifdef DEBUG_IP_FIREWALL | |
41 | #define dprintf(format, args...) printk(format , ## args) | |
42 | #else | |
43 | #define dprintf(format, args...) | |
44 | #endif | |
45 | ||
46 | #ifdef DEBUG_IP_FIREWALL_USER | |
47 | #define duprintf(format, args...) printk(format , ## args) | |
48 | #else | |
49 | #define duprintf(format, args...) | |
50 | #endif | |
51 | ||
52 | #ifdef CONFIG_NETFILTER_DEBUG | |
53 | #define IP_NF_ASSERT(x) \ | |
54 | do { \ | |
55 | if (!(x)) \ | |
56 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ | |
0dc47877 | 57 | __func__, __FILE__, __LINE__); \ |
1da177e4 LT |
58 | } while(0) |
59 | #else | |
60 | #define IP_NF_ASSERT(x) | |
61 | #endif | |
1da177e4 LT |
62 | |
63 | #if 0 | |
64 | /* All the better to debug you with... */ | |
65 | #define static | |
66 | #define inline | |
67 | #endif | |
68 | ||
69 | /* | |
70 | We keep a set of rules for each CPU, so we can avoid write-locking | |
71 | them in the softirq when updating the counters and therefore | |
72 | only need to read-lock in the softirq; doing a write_lock_bh() in user | |
73 | context stops packets coming through and allows user context to read | |
74 | the counters or update the rules. | |
75 | ||
1da177e4 LT |
76 | Hence the start of any table is given by get_table() below. */ |
77 | ||
1da177e4 | 78 | /* Returns whether matches rule or not. */ |
022748a9 | 79 | /* Performance critical - called for every packet */ |
9c547959 | 80 | static inline bool |
1da177e4 LT |
81 | ip_packet_match(const struct iphdr *ip, |
82 | const char *indev, | |
83 | const char *outdev, | |
84 | const struct ipt_ip *ipinfo, | |
85 | int isfrag) | |
86 | { | |
1da177e4 LT |
87 | unsigned long ret; |
88 | ||
e79ec50b | 89 | #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) |
1da177e4 LT |
90 | |
91 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, | |
92 | IPT_INV_SRCIP) | |
93 | || FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, | |
94 | IPT_INV_DSTIP)) { | |
95 | dprintf("Source or dest mismatch.\n"); | |
96 | ||
cffee385 HH |
97 | dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n", |
98 | &ip->saddr, &ipinfo->smsk.s_addr, &ipinfo->src.s_addr, | |
1da177e4 | 99 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); |
cffee385 HH |
100 | dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n", |
101 | &ip->daddr, &ipinfo->dmsk.s_addr, &ipinfo->dst.s_addr, | |
1da177e4 | 102 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); |
9c547959 | 103 | return false; |
1da177e4 LT |
104 | } |
105 | ||
b8dfe498 | 106 | ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask); |
1da177e4 LT |
107 | |
108 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { | |
109 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
110 | indev, ipinfo->iniface, | |
111 | ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":""); | |
9c547959 | 112 | return false; |
1da177e4 LT |
113 | } |
114 | ||
b8dfe498 | 115 | ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
1da177e4 LT |
116 | |
117 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { | |
118 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
119 | outdev, ipinfo->outiface, | |
120 | ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":""); | |
9c547959 | 121 | return false; |
1da177e4 LT |
122 | } |
123 | ||
124 | /* Check specific protocol */ | |
125 | if (ipinfo->proto | |
126 | && FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { | |
127 | dprintf("Packet protocol %hi does not match %hi.%s\n", | |
128 | ip->protocol, ipinfo->proto, | |
129 | ipinfo->invflags&IPT_INV_PROTO ? " (INV)":""); | |
9c547959 | 130 | return false; |
1da177e4 LT |
131 | } |
132 | ||
133 | /* If we have a fragment rule but the packet is not a fragment | |
134 | * then we return zero */ | |
135 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { | |
136 | dprintf("Fragment rule but not fragment.%s\n", | |
137 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); | |
9c547959 | 138 | return false; |
1da177e4 LT |
139 | } |
140 | ||
9c547959 | 141 | return true; |
1da177e4 LT |
142 | } |
143 | ||
022748a9 | 144 | static bool |
1da177e4 LT |
145 | ip_checkentry(const struct ipt_ip *ip) |
146 | { | |
147 | if (ip->flags & ~IPT_F_MASK) { | |
148 | duprintf("Unknown flag bits set: %08X\n", | |
149 | ip->flags & ~IPT_F_MASK); | |
ccb79bdc | 150 | return false; |
1da177e4 LT |
151 | } |
152 | if (ip->invflags & ~IPT_INV_MASK) { | |
153 | duprintf("Unknown invflag bits set: %08X\n", | |
154 | ip->invflags & ~IPT_INV_MASK); | |
ccb79bdc | 155 | return false; |
1da177e4 | 156 | } |
ccb79bdc | 157 | return true; |
1da177e4 LT |
158 | } |
159 | ||
160 | static unsigned int | |
7eb35586 | 161 | ipt_error(struct sk_buff *skb, const struct xt_target_param *par) |
1da177e4 LT |
162 | { |
163 | if (net_ratelimit()) | |
7eb35586 JE |
164 | printk("ip_tables: error: `%s'\n", |
165 | (const char *)par->targinfo); | |
1da177e4 LT |
166 | |
167 | return NF_DROP; | |
168 | } | |
169 | ||
022748a9 DV |
170 | /* Performance critical - called for every packet */ |
171 | static inline bool | |
f7108a20 JE |
172 | do_match(struct ipt_entry_match *m, const struct sk_buff *skb, |
173 | struct xt_match_param *par) | |
1da177e4 | 174 | { |
f7108a20 JE |
175 | par->match = m->u.kernel.match; |
176 | par->matchinfo = m->data; | |
177 | ||
1da177e4 | 178 | /* Stop iteration if it doesn't match */ |
f7108a20 | 179 | if (!m->u.kernel.match->match(skb, par)) |
1d93a9cb | 180 | return true; |
1da177e4 | 181 | else |
1d93a9cb | 182 | return false; |
1da177e4 LT |
183 | } |
184 | ||
022748a9 | 185 | /* Performance critical */ |
1da177e4 LT |
186 | static inline struct ipt_entry * |
187 | get_entry(void *base, unsigned int offset) | |
188 | { | |
189 | return (struct ipt_entry *)(base + offset); | |
190 | } | |
191 | ||
ba9dda3a | 192 | /* All zeroes == unconditional rule. */ |
022748a9 | 193 | /* Mildly perf critical (only if packet tracing is on) */ |
47901dc2 | 194 | static inline bool unconditional(const struct ipt_ip *ip) |
ba9dda3a | 195 | { |
47901dc2 | 196 | static const struct ipt_ip uncond; |
ba9dda3a | 197 | |
47901dc2 | 198 | return memcmp(ip, &uncond, sizeof(uncond)) == 0; |
e79ec50b | 199 | #undef FWINV |
ba9dda3a JK |
200 | } |
201 | ||
202 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
203 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
022748a9 | 204 | static const char *const hooknames[] = { |
6e23ae2a PM |
205 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
206 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 207 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
208 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
209 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
210 | }; |
211 | ||
212 | enum nf_ip_trace_comments { | |
213 | NF_IP_TRACE_COMMENT_RULE, | |
214 | NF_IP_TRACE_COMMENT_RETURN, | |
215 | NF_IP_TRACE_COMMENT_POLICY, | |
216 | }; | |
217 | ||
022748a9 | 218 | static const char *const comments[] = { |
ba9dda3a JK |
219 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
220 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
221 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
222 | }; | |
223 | ||
224 | static struct nf_loginfo trace_loginfo = { | |
225 | .type = NF_LOG_TYPE_LOG, | |
226 | .u = { | |
227 | .log = { | |
228 | .level = 4, | |
229 | .logflags = NF_LOG_MASK, | |
230 | }, | |
231 | }, | |
232 | }; | |
233 | ||
022748a9 | 234 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a JK |
235 | static inline int |
236 | get_chainname_rulenum(struct ipt_entry *s, struct ipt_entry *e, | |
4f2f6f23 JE |
237 | const char *hookname, const char **chainname, |
238 | const char **comment, unsigned int *rulenum) | |
ba9dda3a JK |
239 | { |
240 | struct ipt_standard_target *t = (void *)ipt_get_target(s); | |
241 | ||
242 | if (strcmp(t->target.u.kernel.target->name, IPT_ERROR_TARGET) == 0) { | |
243 | /* Head of user chain: ERROR target with chainname */ | |
244 | *chainname = t->target.data; | |
245 | (*rulenum) = 0; | |
246 | } else if (s == e) { | |
247 | (*rulenum)++; | |
248 | ||
249 | if (s->target_offset == sizeof(struct ipt_entry) | |
250 | && strcmp(t->target.u.kernel.target->name, | |
251 | IPT_STANDARD_TARGET) == 0 | |
252 | && t->verdict < 0 | |
253 | && unconditional(&s->ip)) { | |
254 | /* Tail of chains: STANDARD target (return/policy) */ | |
255 | *comment = *chainname == hookname | |
4f2f6f23 JE |
256 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
257 | : comments[NF_IP_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
258 | } |
259 | return 1; | |
260 | } else | |
261 | (*rulenum)++; | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | static void trace_packet(struct sk_buff *skb, | |
267 | unsigned int hook, | |
268 | const struct net_device *in, | |
269 | const struct net_device *out, | |
ecb6f85e | 270 | const char *tablename, |
ba9dda3a JK |
271 | struct xt_table_info *private, |
272 | struct ipt_entry *e) | |
273 | { | |
274 | void *table_base; | |
5452e425 | 275 | const struct ipt_entry *root; |
4f2f6f23 | 276 | const char *hookname, *chainname, *comment; |
ba9dda3a JK |
277 | unsigned int rulenum = 0; |
278 | ||
ccf5bd8c | 279 | table_base = private->entries[smp_processor_id()]; |
ba9dda3a JK |
280 | root = get_entry(table_base, private->hook_entry[hook]); |
281 | ||
4f2f6f23 JE |
282 | hookname = chainname = hooknames[hook]; |
283 | comment = comments[NF_IP_TRACE_COMMENT_RULE]; | |
ba9dda3a JK |
284 | |
285 | IPT_ENTRY_ITERATE(root, | |
286 | private->size - private->hook_entry[hook], | |
287 | get_chainname_rulenum, | |
288 | e, hookname, &chainname, &comment, &rulenum); | |
289 | ||
290 | nf_log_packet(AF_INET, hook, skb, in, out, &trace_loginfo, | |
291 | "TRACE: %s:%s:%s:%u ", | |
292 | tablename, chainname, comment, rulenum); | |
293 | } | |
294 | #endif | |
295 | ||
98e86403 JE |
296 | static inline __pure |
297 | struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry) | |
298 | { | |
299 | return (void *)entry + entry->next_offset; | |
300 | } | |
301 | ||
1da177e4 LT |
302 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
303 | unsigned int | |
3db05fea | 304 | ipt_do_table(struct sk_buff *skb, |
1da177e4 LT |
305 | unsigned int hook, |
306 | const struct net_device *in, | |
307 | const struct net_device *out, | |
e60a13e0 | 308 | struct xt_table *table) |
1da177e4 | 309 | { |
bb70dfa5 JE |
310 | #define tb_comefrom ((struct ipt_entry *)table_base)->comefrom |
311 | ||
1da177e4 | 312 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
5452e425 | 313 | const struct iphdr *ip; |
cff533ac | 314 | bool hotdrop = false; |
1da177e4 LT |
315 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
316 | unsigned int verdict = NF_DROP; | |
317 | const char *indev, *outdev; | |
318 | void *table_base; | |
319 | struct ipt_entry *e, *back; | |
8311731a | 320 | struct xt_table_info *private; |
f7108a20 | 321 | struct xt_match_param mtpar; |
7eb35586 | 322 | struct xt_target_param tgpar; |
1da177e4 LT |
323 | |
324 | /* Initialization */ | |
3db05fea | 325 | ip = ip_hdr(skb); |
1da177e4 LT |
326 | indev = in ? in->name : nulldevname; |
327 | outdev = out ? out->name : nulldevname; | |
328 | /* We handle fragments by dealing with the first fragment as | |
329 | * if it was a normal packet. All other fragments are treated | |
330 | * normally, except that they will NEVER match rules that ask | |
331 | * things we don't know, ie. tcp syn flag or ports). If the | |
332 | * rule is also a fragment-specific rule, non-fragments won't | |
333 | * match it. */ | |
f7108a20 JE |
334 | mtpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
335 | mtpar.thoff = ip_hdrlen(skb); | |
336 | mtpar.hotdrop = &hotdrop; | |
7eb35586 JE |
337 | mtpar.in = tgpar.in = in; |
338 | mtpar.out = tgpar.out = out; | |
916a917d | 339 | mtpar.family = tgpar.family = NFPROTO_IPV4; |
a5e78820 | 340 | mtpar.hooknum = tgpar.hooknum = hook; |
1da177e4 | 341 | |
1da177e4 | 342 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
942e4a2b SH |
343 | xt_info_rdlock_bh(); |
344 | private = table->private; | |
345 | table_base = private->entries[smp_processor_id()]; | |
78454473 | 346 | |
2e4e6a17 | 347 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 LT |
348 | |
349 | /* For return from builtin chain */ | |
2e4e6a17 | 350 | back = get_entry(table_base, private->underflow[hook]); |
1da177e4 LT |
351 | |
352 | do { | |
a1ff4ac8 JE |
353 | struct ipt_entry_target *t; |
354 | ||
1da177e4 LT |
355 | IP_NF_ASSERT(e); |
356 | IP_NF_ASSERT(back); | |
a1ff4ac8 | 357 | if (!ip_packet_match(ip, indev, outdev, |
9452258d JE |
358 | &e->ip, mtpar.fragoff) || |
359 | IPT_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) { | |
a1ff4ac8 JE |
360 | e = ipt_next_entry(e); |
361 | continue; | |
362 | } | |
1da177e4 | 363 | |
a1ff4ac8 | 364 | ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1); |
1da177e4 | 365 | |
a1ff4ac8 JE |
366 | t = ipt_get_target(e); |
367 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a JK |
368 | |
369 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ | |
370 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) | |
a1ff4ac8 JE |
371 | /* The packet is traced: log it */ |
372 | if (unlikely(skb->nf_trace)) | |
373 | trace_packet(skb, hook, in, out, | |
374 | table->name, private, e); | |
ba9dda3a | 375 | #endif |
a1ff4ac8 JE |
376 | /* Standard target? */ |
377 | if (!t->u.kernel.target->target) { | |
378 | int v; | |
379 | ||
380 | v = ((struct ipt_standard_target *)t)->verdict; | |
381 | if (v < 0) { | |
382 | /* Pop from stack? */ | |
383 | if (v != IPT_RETURN) { | |
384 | verdict = (unsigned)(-v) - 1; | |
385 | break; | |
1da177e4 | 386 | } |
a1ff4ac8 JE |
387 | e = back; |
388 | back = get_entry(table_base, back->comefrom); | |
389 | continue; | |
390 | } | |
391 | if (table_base + v != ipt_next_entry(e) | |
392 | && !(e->ip.flags & IPT_F_GOTO)) { | |
393 | /* Save old back ptr in next entry */ | |
394 | struct ipt_entry *next = ipt_next_entry(e); | |
395 | next->comefrom = (void *)back - table_base; | |
396 | /* set back pointer to next entry */ | |
397 | back = next; | |
398 | } | |
1da177e4 | 399 | |
a1ff4ac8 | 400 | e = get_entry(table_base, v); |
7a6b1c46 JE |
401 | continue; |
402 | } | |
403 | ||
404 | /* Targets which reenter must return | |
405 | abs. verdicts */ | |
406 | tgpar.target = t->u.kernel.target; | |
407 | tgpar.targinfo = t->data; | |
bb70dfa5 JE |
408 | |
409 | ||
1da177e4 | 410 | #ifdef CONFIG_NETFILTER_DEBUG |
bb70dfa5 | 411 | tb_comefrom = 0xeeeeeeec; |
1da177e4 | 412 | #endif |
7a6b1c46 | 413 | verdict = t->u.kernel.target->target(skb, &tgpar); |
1da177e4 | 414 | #ifdef CONFIG_NETFILTER_DEBUG |
24992eac | 415 | if (tb_comefrom != 0xeeeeeeec && verdict == IPT_CONTINUE) { |
7a6b1c46 JE |
416 | printk("Target %s reentered!\n", |
417 | t->u.kernel.target->name); | |
418 | verdict = NF_DROP; | |
1da177e4 | 419 | } |
bb70dfa5 | 420 | tb_comefrom = 0x57acc001; |
7a6b1c46 JE |
421 | #endif |
422 | /* Target might have changed stuff. */ | |
423 | ip = ip_hdr(skb); | |
7a6b1c46 JE |
424 | if (verdict == IPT_CONTINUE) |
425 | e = ipt_next_entry(e); | |
426 | else | |
427 | /* Verdict */ | |
428 | break; | |
1da177e4 | 429 | } while (!hotdrop); |
942e4a2b | 430 | xt_info_rdunlock_bh(); |
1da177e4 LT |
431 | |
432 | #ifdef DEBUG_ALLOW_ALL | |
433 | return NF_ACCEPT; | |
434 | #else | |
435 | if (hotdrop) | |
436 | return NF_DROP; | |
437 | else return verdict; | |
438 | #endif | |
bb70dfa5 JE |
439 | |
440 | #undef tb_comefrom | |
1da177e4 LT |
441 | } |
442 | ||
1da177e4 LT |
443 | /* Figures out from what hook each rule can be called: returns 0 if |
444 | there are loops. Puts hook bitmask in comefrom. */ | |
445 | static int | |
2e4e6a17 | 446 | mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 447 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
448 | { |
449 | unsigned int hook; | |
450 | ||
451 | /* No recursion; use packet counter to save back ptrs (reset | |
452 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 453 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 454 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 455 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
456 | |
457 | if (!(valid_hooks & (1 << hook))) | |
458 | continue; | |
459 | ||
460 | /* Set initial back pointer. */ | |
461 | e->counters.pcnt = pos; | |
462 | ||
463 | for (;;) { | |
464 | struct ipt_standard_target *t | |
465 | = (void *)ipt_get_target(e); | |
e1b4b9f3 | 466 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 467 | |
6e23ae2a | 468 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
469 | printk("iptables: loop hook %u pos %u %08X.\n", |
470 | hook, pos, e->comefrom); | |
471 | return 0; | |
472 | } | |
9c547959 | 473 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
474 | |
475 | /* Unconditional return/END. */ | |
e1b4b9f3 | 476 | if ((e->target_offset == sizeof(struct ipt_entry) |
1da177e4 LT |
477 | && (strcmp(t->target.u.user.name, |
478 | IPT_STANDARD_TARGET) == 0) | |
479 | && t->verdict < 0 | |
e1b4b9f3 | 480 | && unconditional(&e->ip)) || visited) { |
1da177e4 LT |
481 | unsigned int oldpos, size; |
482 | ||
1f9352ae PM |
483 | if ((strcmp(t->target.u.user.name, |
484 | IPT_STANDARD_TARGET) == 0) && | |
485 | t->verdict < -NF_MAX_VERDICT - 1) { | |
74c9c0c1 DM |
486 | duprintf("mark_source_chains: bad " |
487 | "negative verdict (%i)\n", | |
488 | t->verdict); | |
489 | return 0; | |
490 | } | |
491 | ||
1da177e4 LT |
492 | /* Return: backtrack through the last |
493 | big jump. */ | |
494 | do { | |
6e23ae2a | 495 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
496 | #ifdef DEBUG_IP_FIREWALL_USER |
497 | if (e->comefrom | |
6e23ae2a | 498 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
499 | duprintf("Back unset " |
500 | "on hook %u " | |
501 | "rule %u\n", | |
502 | hook, pos); | |
503 | } | |
504 | #endif | |
505 | oldpos = pos; | |
506 | pos = e->counters.pcnt; | |
507 | e->counters.pcnt = 0; | |
508 | ||
509 | /* We're at the start. */ | |
510 | if (pos == oldpos) | |
511 | goto next; | |
512 | ||
513 | e = (struct ipt_entry *) | |
31836064 | 514 | (entry0 + pos); |
1da177e4 LT |
515 | } while (oldpos == pos + e->next_offset); |
516 | ||
517 | /* Move along one */ | |
518 | size = e->next_offset; | |
519 | e = (struct ipt_entry *) | |
31836064 | 520 | (entry0 + pos + size); |
1da177e4 LT |
521 | e->counters.pcnt = pos; |
522 | pos += size; | |
523 | } else { | |
524 | int newpos = t->verdict; | |
525 | ||
526 | if (strcmp(t->target.u.user.name, | |
527 | IPT_STANDARD_TARGET) == 0 | |
528 | && newpos >= 0) { | |
74c9c0c1 DM |
529 | if (newpos > newinfo->size - |
530 | sizeof(struct ipt_entry)) { | |
531 | duprintf("mark_source_chains: " | |
532 | "bad verdict (%i)\n", | |
533 | newpos); | |
534 | return 0; | |
535 | } | |
1da177e4 LT |
536 | /* This a jump; chase it. */ |
537 | duprintf("Jump rule %u -> %u\n", | |
538 | pos, newpos); | |
539 | } else { | |
540 | /* ... this is a fallthru */ | |
541 | newpos = pos + e->next_offset; | |
542 | } | |
543 | e = (struct ipt_entry *) | |
31836064 | 544 | (entry0 + newpos); |
1da177e4 LT |
545 | e->counters.pcnt = pos; |
546 | pos = newpos; | |
547 | } | |
548 | } | |
549 | next: | |
550 | duprintf("Finished chain %u\n", hook); | |
551 | } | |
552 | return 1; | |
553 | } | |
554 | ||
022748a9 | 555 | static int |
1da177e4 LT |
556 | cleanup_match(struct ipt_entry_match *m, unsigned int *i) |
557 | { | |
6be3d859 JE |
558 | struct xt_mtdtor_param par; |
559 | ||
1da177e4 LT |
560 | if (i && (*i)-- == 0) |
561 | return 1; | |
562 | ||
6be3d859 JE |
563 | par.match = m->u.kernel.match; |
564 | par.matchinfo = m->data; | |
916a917d | 565 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
566 | if (par.match->destroy != NULL) |
567 | par.match->destroy(&par); | |
568 | module_put(par.match->me); | |
1da177e4 LT |
569 | return 0; |
570 | } | |
571 | ||
022748a9 | 572 | static int |
a96be246 DM |
573 | check_entry(struct ipt_entry *e, const char *name) |
574 | { | |
575 | struct ipt_entry_target *t; | |
576 | ||
577 | if (!ip_checkentry(&e->ip)) { | |
578 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); | |
579 | return -EINVAL; | |
580 | } | |
581 | ||
9c547959 PM |
582 | if (e->target_offset + sizeof(struct ipt_entry_target) > |
583 | e->next_offset) | |
a96be246 DM |
584 | return -EINVAL; |
585 | ||
586 | t = ipt_get_target(e); | |
587 | if (e->target_offset + t->u.target_size > e->next_offset) | |
588 | return -EINVAL; | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
022748a9 | 593 | static int |
9b4fce7a JE |
594 | check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par, |
595 | unsigned int *i) | |
a96be246 | 596 | { |
9b4fce7a | 597 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 DM |
598 | int ret; |
599 | ||
9b4fce7a JE |
600 | par->match = m->u.kernel.match; |
601 | par->matchinfo = m->data; | |
602 | ||
916a917d | 603 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 604 | ip->proto, ip->invflags & IPT_INV_PROTO); |
367c6790 | 605 | if (ret < 0) { |
a96be246 | 606 | duprintf("ip_tables: check failed for `%s'.\n", |
9b4fce7a | 607 | par.match->name); |
367c6790 | 608 | return ret; |
a96be246 | 609 | } |
367c6790 JE |
610 | ++*i; |
611 | return 0; | |
a96be246 DM |
612 | } |
613 | ||
022748a9 | 614 | static int |
9b4fce7a | 615 | find_check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par, |
4b478248 | 616 | unsigned int *i) |
1da177e4 | 617 | { |
6709dbbb | 618 | struct xt_match *match; |
3cdc7c95 | 619 | int ret; |
1da177e4 | 620 | |
2e4e6a17 | 621 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, |
9c547959 | 622 | m->u.user.revision), |
1da177e4 LT |
623 | "ipt_%s", m->u.user.name); |
624 | if (IS_ERR(match) || !match) { | |
a96be246 | 625 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
1da177e4 LT |
626 | return match ? PTR_ERR(match) : -ENOENT; |
627 | } | |
628 | m->u.kernel.match = match; | |
629 | ||
9b4fce7a | 630 | ret = check_match(m, par, i); |
3cdc7c95 PM |
631 | if (ret) |
632 | goto err; | |
633 | ||
1da177e4 | 634 | return 0; |
3cdc7c95 PM |
635 | err: |
636 | module_put(m->u.kernel.match->me); | |
637 | return ret; | |
1da177e4 LT |
638 | } |
639 | ||
022748a9 | 640 | static int check_target(struct ipt_entry *e, const char *name) |
a96be246 | 641 | { |
af5d6dc2 JE |
642 | struct ipt_entry_target *t = ipt_get_target(e); |
643 | struct xt_tgchk_param par = { | |
644 | .table = name, | |
645 | .entryinfo = e, | |
646 | .target = t->u.kernel.target, | |
647 | .targinfo = t->data, | |
648 | .hook_mask = e->comefrom, | |
916a917d | 649 | .family = NFPROTO_IPV4, |
af5d6dc2 | 650 | }; |
e905a9ed | 651 | int ret; |
a96be246 | 652 | |
916a917d | 653 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 654 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
367c6790 | 655 | if (ret < 0) { |
a96be246 DM |
656 | duprintf("ip_tables: check failed for `%s'.\n", |
657 | t->u.kernel.target->name); | |
367c6790 | 658 | return ret; |
a96be246 | 659 | } |
367c6790 | 660 | return 0; |
a96be246 | 661 | } |
1da177e4 | 662 | |
022748a9 | 663 | static int |
a96be246 | 664 | find_check_entry(struct ipt_entry *e, const char *name, unsigned int size, |
4b478248 | 665 | unsigned int *i) |
1da177e4 LT |
666 | { |
667 | struct ipt_entry_target *t; | |
6709dbbb | 668 | struct xt_target *target; |
1da177e4 LT |
669 | int ret; |
670 | unsigned int j; | |
9b4fce7a | 671 | struct xt_mtchk_param mtpar; |
1da177e4 | 672 | |
a96be246 DM |
673 | ret = check_entry(e, name); |
674 | if (ret) | |
675 | return ret; | |
590bdf7f | 676 | |
1da177e4 | 677 | j = 0; |
9b4fce7a JE |
678 | mtpar.table = name; |
679 | mtpar.entryinfo = &e->ip; | |
680 | mtpar.hook_mask = e->comefrom; | |
916a917d | 681 | mtpar.family = NFPROTO_IPV4; |
9b4fce7a | 682 | ret = IPT_MATCH_ITERATE(e, find_check_match, &mtpar, &j); |
1da177e4 LT |
683 | if (ret != 0) |
684 | goto cleanup_matches; | |
685 | ||
686 | t = ipt_get_target(e); | |
2e4e6a17 | 687 | target = try_then_request_module(xt_find_target(AF_INET, |
4b478248 PM |
688 | t->u.user.name, |
689 | t->u.user.revision), | |
1da177e4 LT |
690 | "ipt_%s", t->u.user.name); |
691 | if (IS_ERR(target) || !target) { | |
a96be246 | 692 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
1da177e4 LT |
693 | ret = target ? PTR_ERR(target) : -ENOENT; |
694 | goto cleanup_matches; | |
695 | } | |
696 | t->u.kernel.target = target; | |
697 | ||
a96be246 | 698 | ret = check_target(e, name); |
3cdc7c95 PM |
699 | if (ret) |
700 | goto err; | |
701 | ||
1da177e4 LT |
702 | (*i)++; |
703 | return 0; | |
3cdc7c95 PM |
704 | err: |
705 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
706 | cleanup_matches: |
707 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
708 | return ret; | |
709 | } | |
710 | ||
e2fe35c1 JE |
711 | static bool check_underflow(struct ipt_entry *e) |
712 | { | |
713 | const struct ipt_entry_target *t; | |
714 | unsigned int verdict; | |
715 | ||
716 | if (!unconditional(&e->ip)) | |
717 | return false; | |
718 | t = ipt_get_target(e); | |
719 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) | |
720 | return false; | |
721 | verdict = ((struct ipt_standard_target *)t)->verdict; | |
722 | verdict = -verdict - 1; | |
723 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
724 | } | |
725 | ||
022748a9 | 726 | static int |
1da177e4 | 727 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 728 | struct xt_table_info *newinfo, |
1da177e4 LT |
729 | unsigned char *base, |
730 | unsigned char *limit, | |
731 | const unsigned int *hook_entries, | |
732 | const unsigned int *underflows, | |
a7d51738 | 733 | unsigned int valid_hooks, |
1da177e4 LT |
734 | unsigned int *i) |
735 | { | |
736 | unsigned int h; | |
737 | ||
738 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 | |
739 | || (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { | |
740 | duprintf("Bad offset %p\n", e); | |
741 | return -EINVAL; | |
742 | } | |
743 | ||
744 | if (e->next_offset | |
745 | < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) { | |
746 | duprintf("checking: element %p size %u\n", | |
747 | e, e->next_offset); | |
748 | return -EINVAL; | |
749 | } | |
750 | ||
751 | /* Check hooks & underflows */ | |
6e23ae2a | 752 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
753 | if (!(valid_hooks & (1 << h))) |
754 | continue; | |
1da177e4 LT |
755 | if ((unsigned char *)e - base == hook_entries[h]) |
756 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 757 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
758 | if (!check_underflow(e)) { |
759 | pr_err("Underflows must be unconditional and " | |
760 | "use the STANDARD target with " | |
761 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
762 | return -EINVAL; |
763 | } | |
1da177e4 | 764 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 765 | } |
1da177e4 LT |
766 | } |
767 | ||
1da177e4 | 768 | /* Clear counters and comefrom */ |
2e4e6a17 | 769 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
770 | e->comefrom = 0; |
771 | ||
772 | (*i)++; | |
773 | return 0; | |
774 | } | |
775 | ||
022748a9 | 776 | static int |
1da177e4 LT |
777 | cleanup_entry(struct ipt_entry *e, unsigned int *i) |
778 | { | |
a2df1648 | 779 | struct xt_tgdtor_param par; |
1da177e4 LT |
780 | struct ipt_entry_target *t; |
781 | ||
782 | if (i && (*i)-- == 0) | |
783 | return 1; | |
784 | ||
785 | /* Cleanup all matches */ | |
786 | IPT_MATCH_ITERATE(e, cleanup_match, NULL); | |
787 | t = ipt_get_target(e); | |
a2df1648 JE |
788 | |
789 | par.target = t->u.kernel.target; | |
790 | par.targinfo = t->data; | |
916a917d | 791 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
792 | if (par.target->destroy != NULL) |
793 | par.target->destroy(&par); | |
794 | module_put(par.target->me); | |
1da177e4 LT |
795 | return 0; |
796 | } | |
797 | ||
798 | /* Checks and translates the user-supplied table segment (held in | |
799 | newinfo) */ | |
800 | static int | |
801 | translate_table(const char *name, | |
802 | unsigned int valid_hooks, | |
2e4e6a17 | 803 | struct xt_table_info *newinfo, |
31836064 | 804 | void *entry0, |
1da177e4 LT |
805 | unsigned int size, |
806 | unsigned int number, | |
807 | const unsigned int *hook_entries, | |
808 | const unsigned int *underflows) | |
809 | { | |
810 | unsigned int i; | |
811 | int ret; | |
812 | ||
813 | newinfo->size = size; | |
814 | newinfo->number = number; | |
815 | ||
816 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 817 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
818 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
819 | newinfo->underflow[i] = 0xFFFFFFFF; | |
820 | } | |
821 | ||
822 | duprintf("translate_table: size %u\n", newinfo->size); | |
823 | i = 0; | |
824 | /* Walk through entries, checking offsets. */ | |
31836064 | 825 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
826 | check_entry_size_and_hooks, |
827 | newinfo, | |
31836064 ED |
828 | entry0, |
829 | entry0 + size, | |
a7d51738 | 830 | hook_entries, underflows, valid_hooks, &i); |
1da177e4 LT |
831 | if (ret != 0) |
832 | return ret; | |
833 | ||
834 | if (i != number) { | |
835 | duprintf("translate_table: %u not %u entries\n", | |
836 | i, number); | |
837 | return -EINVAL; | |
838 | } | |
839 | ||
840 | /* Check hooks all assigned */ | |
6e23ae2a | 841 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
842 | /* Only hooks which are valid */ |
843 | if (!(valid_hooks & (1 << i))) | |
844 | continue; | |
845 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
846 | duprintf("Invalid hook entry %u %u\n", | |
847 | i, hook_entries[i]); | |
848 | return -EINVAL; | |
849 | } | |
850 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
851 | duprintf("Invalid underflow %u %u\n", | |
852 | i, underflows[i]); | |
853 | return -EINVAL; | |
854 | } | |
855 | } | |
856 | ||
74c9c0c1 DM |
857 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
858 | return -ELOOP; | |
859 | ||
1da177e4 LT |
860 | /* Finally, each sanity check must pass */ |
861 | i = 0; | |
31836064 | 862 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
a96be246 | 863 | find_check_entry, name, size, &i); |
1da177e4 | 864 | |
74c9c0c1 DM |
865 | if (ret != 0) { |
866 | IPT_ENTRY_ITERATE(entry0, newinfo->size, | |
867 | cleanup_entry, &i); | |
868 | return ret; | |
869 | } | |
1da177e4 LT |
870 | |
871 | /* And one copy for every other CPU */ | |
6f912042 | 872 | for_each_possible_cpu(i) { |
31836064 ED |
873 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
874 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
875 | } |
876 | ||
877 | return ret; | |
878 | } | |
879 | ||
1da177e4 LT |
880 | /* Gets counters. */ |
881 | static inline int | |
882 | add_entry_to_counter(const struct ipt_entry *e, | |
2e4e6a17 | 883 | struct xt_counters total[], |
1da177e4 LT |
884 | unsigned int *i) |
885 | { | |
886 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
887 | ||
888 | (*i)++; | |
889 | return 0; | |
890 | } | |
891 | ||
31836064 ED |
892 | static inline int |
893 | set_entry_to_counter(const struct ipt_entry *e, | |
894 | struct ipt_counters total[], | |
895 | unsigned int *i) | |
896 | { | |
897 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
898 | ||
899 | (*i)++; | |
900 | return 0; | |
901 | } | |
902 | ||
1da177e4 | 903 | static void |
2e4e6a17 HW |
904 | get_counters(const struct xt_table_info *t, |
905 | struct xt_counters counters[]) | |
1da177e4 LT |
906 | { |
907 | unsigned int cpu; | |
908 | unsigned int i; | |
31836064 ED |
909 | unsigned int curcpu; |
910 | ||
911 | /* Instead of clearing (by a previous call to memset()) | |
912 | * the counters and using adds, we set the counters | |
942e4a2b SH |
913 | * with data used by 'current' CPU. |
914 | * | |
915 | * Bottom half has to be disabled to prevent deadlock | |
916 | * if new softirq were to run and call ipt_do_table | |
31836064 | 917 | */ |
942e4a2b SH |
918 | local_bh_disable(); |
919 | curcpu = smp_processor_id(); | |
31836064 ED |
920 | |
921 | i = 0; | |
922 | IPT_ENTRY_ITERATE(t->entries[curcpu], | |
923 | t->size, | |
924 | set_entry_to_counter, | |
925 | counters, | |
926 | &i); | |
1da177e4 | 927 | |
6f912042 | 928 | for_each_possible_cpu(cpu) { |
31836064 ED |
929 | if (cpu == curcpu) |
930 | continue; | |
1da177e4 | 931 | i = 0; |
942e4a2b | 932 | xt_info_wrlock(cpu); |
31836064 | 933 | IPT_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
934 | t->size, |
935 | add_entry_to_counter, | |
936 | counters, | |
937 | &i); | |
942e4a2b | 938 | xt_info_wrunlock(cpu); |
1da177e4 | 939 | } |
78454473 SH |
940 | local_bh_enable(); |
941 | } | |
942 | ||
022748a9 | 943 | static struct xt_counters * alloc_counters(struct xt_table *table) |
1da177e4 | 944 | { |
2722971c | 945 | unsigned int countersize; |
2e4e6a17 | 946 | struct xt_counters *counters; |
78454473 | 947 | struct xt_table_info *private = table->private; |
1da177e4 LT |
948 | |
949 | /* We need atomic snapshot of counters: rest doesn't change | |
950 | (other than comefrom, which userspace doesn't care | |
951 | about). */ | |
2e4e6a17 | 952 | countersize = sizeof(struct xt_counters) * private->number; |
31836064 | 953 | counters = vmalloc_node(countersize, numa_node_id()); |
1da177e4 LT |
954 | |
955 | if (counters == NULL) | |
942e4a2b | 956 | return ERR_PTR(-ENOMEM); |
78454473 | 957 | |
942e4a2b | 958 | get_counters(private, counters); |
1da177e4 | 959 | |
2722971c DM |
960 | return counters; |
961 | } | |
962 | ||
963 | static int | |
964 | copy_entries_to_user(unsigned int total_size, | |
e60a13e0 | 965 | struct xt_table *table, |
2722971c DM |
966 | void __user *userptr) |
967 | { | |
968 | unsigned int off, num; | |
969 | struct ipt_entry *e; | |
970 | struct xt_counters *counters; | |
5452e425 | 971 | const struct xt_table_info *private = table->private; |
2722971c | 972 | int ret = 0; |
5452e425 | 973 | const void *loc_cpu_entry; |
2722971c DM |
974 | |
975 | counters = alloc_counters(table); | |
976 | if (IS_ERR(counters)) | |
977 | return PTR_ERR(counters); | |
978 | ||
31836064 ED |
979 | /* choose the copy that is on our node/cpu, ... |
980 | * This choice is lazy (because current thread is | |
981 | * allowed to migrate to another cpu) | |
982 | */ | |
2e4e6a17 | 983 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 | 984 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
985 | ret = -EFAULT; |
986 | goto free_counters; | |
987 | } | |
988 | ||
989 | /* FIXME: use iterator macros --RR */ | |
990 | /* ... then go back and fix counters and names */ | |
991 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
992 | unsigned int i; | |
5452e425 JE |
993 | const struct ipt_entry_match *m; |
994 | const struct ipt_entry_target *t; | |
1da177e4 | 995 | |
31836064 | 996 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
997 | if (copy_to_user(userptr + off |
998 | + offsetof(struct ipt_entry, counters), | |
999 | &counters[num], | |
1000 | sizeof(counters[num])) != 0) { | |
1001 | ret = -EFAULT; | |
1002 | goto free_counters; | |
1003 | } | |
1004 | ||
1005 | for (i = sizeof(struct ipt_entry); | |
1006 | i < e->target_offset; | |
1007 | i += m->u.match_size) { | |
1008 | m = (void *)e + i; | |
1009 | ||
1010 | if (copy_to_user(userptr + off + i | |
1011 | + offsetof(struct ipt_entry_match, | |
1012 | u.user.name), | |
1013 | m->u.kernel.match->name, | |
1014 | strlen(m->u.kernel.match->name)+1) | |
1015 | != 0) { | |
1016 | ret = -EFAULT; | |
1017 | goto free_counters; | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | t = ipt_get_target(e); | |
1022 | if (copy_to_user(userptr + off + e->target_offset | |
1023 | + offsetof(struct ipt_entry_target, | |
1024 | u.user.name), | |
1025 | t->u.kernel.target->name, | |
1026 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1027 | ret = -EFAULT; | |
1028 | goto free_counters; | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | free_counters: | |
1033 | vfree(counters); | |
1034 | return ret; | |
1035 | } | |
1036 | ||
2722971c | 1037 | #ifdef CONFIG_COMPAT |
9fa492cd | 1038 | static void compat_standard_from_user(void *dst, void *src) |
2722971c | 1039 | { |
9fa492cd | 1040 | int v = *(compat_int_t *)src; |
2722971c | 1041 | |
9fa492cd | 1042 | if (v > 0) |
b386d9f5 | 1043 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1044 | memcpy(dst, &v, sizeof(v)); |
1045 | } | |
46c5ea3c | 1046 | |
9fa492cd | 1047 | static int compat_standard_to_user(void __user *dst, void *src) |
2722971c | 1048 | { |
9fa492cd | 1049 | compat_int_t cv = *(int *)src; |
2722971c | 1050 | |
9fa492cd | 1051 | if (cv > 0) |
b386d9f5 | 1052 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1053 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1054 | } |
1055 | ||
1056 | static inline int | |
4b478248 | 1057 | compat_calc_match(struct ipt_entry_match *m, int *size) |
2722971c | 1058 | { |
9fa492cd | 1059 | *size += xt_compat_match_offset(m->u.kernel.match); |
2722971c DM |
1060 | return 0; |
1061 | } | |
1062 | ||
259d4e41 | 1063 | static int compat_calc_entry(struct ipt_entry *e, |
4b478248 PM |
1064 | const struct xt_table_info *info, |
1065 | void *base, struct xt_table_info *newinfo) | |
2722971c DM |
1066 | { |
1067 | struct ipt_entry_target *t; | |
e5b5ef7d | 1068 | unsigned int entry_offset; |
2722971c DM |
1069 | int off, i, ret; |
1070 | ||
30c08c41 | 1071 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1072 | entry_offset = (void *)e - base; |
1073 | IPT_MATCH_ITERATE(e, compat_calc_match, &off); | |
1074 | t = ipt_get_target(e); | |
9fa492cd | 1075 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1076 | newinfo->size -= off; |
b386d9f5 | 1077 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1078 | if (ret) |
1079 | return ret; | |
1080 | ||
6e23ae2a | 1081 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1082 | if (info->hook_entry[i] && |
1083 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1084 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1085 | if (info->underflow[i] && |
1086 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1087 | newinfo->underflow[i] -= off; |
1088 | } | |
1089 | return 0; | |
1090 | } | |
1091 | ||
259d4e41 | 1092 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1093 | struct xt_table_info *newinfo) |
2722971c DM |
1094 | { |
1095 | void *loc_cpu_entry; | |
2722971c DM |
1096 | |
1097 | if (!newinfo || !info) | |
1098 | return -EINVAL; | |
1099 | ||
259d4e41 ED |
1100 | /* we dont care about newinfo->entries[] */ |
1101 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
1102 | newinfo->initial_entries = 0; | |
2722971c DM |
1103 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
1104 | return IPT_ENTRY_ITERATE(loc_cpu_entry, info->size, | |
4b478248 PM |
1105 | compat_calc_entry, info, loc_cpu_entry, |
1106 | newinfo); | |
2722971c DM |
1107 | } |
1108 | #endif | |
1109 | ||
34bd137b | 1110 | static int get_info(struct net *net, void __user *user, int *len, int compat) |
2722971c DM |
1111 | { |
1112 | char name[IPT_TABLE_MAXNAMELEN]; | |
e60a13e0 | 1113 | struct xt_table *t; |
2722971c DM |
1114 | int ret; |
1115 | ||
1116 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1117 | duprintf("length %u != %zu\n", *len, |
1118 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1119 | return -EINVAL; |
1120 | } | |
1121 | ||
1122 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1123 | return -EFAULT; | |
1124 | ||
1125 | name[IPT_TABLE_MAXNAMELEN-1] = '\0'; | |
1126 | #ifdef CONFIG_COMPAT | |
1127 | if (compat) | |
1128 | xt_compat_lock(AF_INET); | |
1129 | #endif | |
34bd137b | 1130 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1131 | "iptable_%s", name); |
2722971c DM |
1132 | if (t && !IS_ERR(t)) { |
1133 | struct ipt_getinfo info; | |
5452e425 | 1134 | const struct xt_table_info *private = t->private; |
2722971c DM |
1135 | |
1136 | #ifdef CONFIG_COMPAT | |
1137 | if (compat) { | |
1138 | struct xt_table_info tmp; | |
1139 | ret = compat_table_info(private, &tmp); | |
b386d9f5 | 1140 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1141 | private = &tmp; |
2722971c DM |
1142 | } |
1143 | #endif | |
1144 | info.valid_hooks = t->valid_hooks; | |
1145 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1146 | sizeof(info.hook_entry)); |
2722971c | 1147 | memcpy(info.underflow, private->underflow, |
4b478248 | 1148 | sizeof(info.underflow)); |
2722971c DM |
1149 | info.num_entries = private->number; |
1150 | info.size = private->size; | |
1151 | strcpy(info.name, name); | |
1152 | ||
1153 | if (copy_to_user(user, &info, *len) != 0) | |
1154 | ret = -EFAULT; | |
1155 | else | |
1156 | ret = 0; | |
1157 | ||
1158 | xt_table_unlock(t); | |
1159 | module_put(t->me); | |
1160 | } else | |
1161 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1162 | #ifdef CONFIG_COMPAT | |
1163 | if (compat) | |
1164 | xt_compat_unlock(AF_INET); | |
1165 | #endif | |
1166 | return ret; | |
1167 | } | |
1168 | ||
1169 | static int | |
34bd137b | 1170 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, int *len) |
2722971c DM |
1171 | { |
1172 | int ret; | |
1173 | struct ipt_get_entries get; | |
e60a13e0 | 1174 | struct xt_table *t; |
2722971c DM |
1175 | |
1176 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1177 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1178 | return -EINVAL; |
1179 | } | |
1180 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1181 | return -EFAULT; | |
1182 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1183 | duprintf("get_entries: %u != %zu\n", |
1184 | *len, sizeof(get) + get.size); | |
2722971c DM |
1185 | return -EINVAL; |
1186 | } | |
1187 | ||
34bd137b | 1188 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1189 | if (t && !IS_ERR(t)) { |
5452e425 | 1190 | const struct xt_table_info *private = t->private; |
9c547959 | 1191 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1192 | if (get.size == private->size) |
1193 | ret = copy_entries_to_user(private->size, | |
1194 | t, uptr->entrytable); | |
1195 | else { | |
1196 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1197 | private->size, get.size); |
544473c1 | 1198 | ret = -EAGAIN; |
2722971c DM |
1199 | } |
1200 | module_put(t->me); | |
1201 | xt_table_unlock(t); | |
1202 | } else | |
1203 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1204 | ||
1205 | return ret; | |
1206 | } | |
1207 | ||
1208 | static int | |
34bd137b | 1209 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1210 | struct xt_table_info *newinfo, unsigned int num_counters, |
1211 | void __user *counters_ptr) | |
2722971c DM |
1212 | { |
1213 | int ret; | |
e60a13e0 | 1214 | struct xt_table *t; |
2722971c DM |
1215 | struct xt_table_info *oldinfo; |
1216 | struct xt_counters *counters; | |
1217 | void *loc_cpu_old_entry; | |
1218 | ||
1219 | ret = 0; | |
1220 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); | |
1221 | if (!counters) { | |
1222 | ret = -ENOMEM; | |
1223 | goto out; | |
1224 | } | |
1225 | ||
34bd137b | 1226 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c DM |
1227 | "iptable_%s", name); |
1228 | if (!t || IS_ERR(t)) { | |
1229 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1230 | goto free_newinfo_counters_untrans; | |
1231 | } | |
1232 | ||
1233 | /* You lied! */ | |
1234 | if (valid_hooks != t->valid_hooks) { | |
1235 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1236 | valid_hooks, t->valid_hooks); | |
1237 | ret = -EINVAL; | |
1238 | goto put_module; | |
1239 | } | |
1240 | ||
1241 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1242 | if (!oldinfo) | |
1243 | goto put_module; | |
1244 | ||
1245 | /* Update module usage count based on number of rules */ | |
1246 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1247 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1248 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1249 | (newinfo->number <= oldinfo->initial_entries)) | |
1250 | module_put(t->me); | |
1251 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1252 | (newinfo->number <= oldinfo->initial_entries)) | |
1253 | module_put(t->me); | |
1254 | ||
942e4a2b | 1255 | /* Get the old counters, and synchronize with replace */ |
2722971c | 1256 | get_counters(oldinfo, counters); |
942e4a2b | 1257 | |
2722971c DM |
1258 | /* Decrease module usage counts and free resource */ |
1259 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; | |
4b478248 PM |
1260 | IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry, |
1261 | NULL); | |
2722971c DM |
1262 | xt_free_table_info(oldinfo); |
1263 | if (copy_to_user(counters_ptr, counters, | |
1264 | sizeof(struct xt_counters) * num_counters) != 0) | |
1265 | ret = -EFAULT; | |
1266 | vfree(counters); | |
1267 | xt_table_unlock(t); | |
1268 | return ret; | |
1269 | ||
1270 | put_module: | |
1271 | module_put(t->me); | |
1272 | xt_table_unlock(t); | |
1273 | free_newinfo_counters_untrans: | |
1274 | vfree(counters); | |
1275 | out: | |
1276 | return ret; | |
1277 | } | |
1278 | ||
1279 | static int | |
34bd137b | 1280 | do_replace(struct net *net, void __user *user, unsigned int len) |
2722971c DM |
1281 | { |
1282 | int ret; | |
1283 | struct ipt_replace tmp; | |
1284 | struct xt_table_info *newinfo; | |
1285 | void *loc_cpu_entry; | |
1286 | ||
1287 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1288 | return -EFAULT; | |
1289 | ||
2722971c | 1290 | /* overflow check */ |
2722971c DM |
1291 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1292 | return -ENOMEM; | |
1293 | ||
1294 | newinfo = xt_alloc_table_info(tmp.size); | |
1295 | if (!newinfo) | |
1296 | return -ENOMEM; | |
1297 | ||
9c547959 | 1298 | /* choose the copy that is on our node/cpu */ |
2722971c DM |
1299 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1300 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1301 | tmp.size) != 0) { | |
1302 | ret = -EFAULT; | |
1303 | goto free_newinfo; | |
1304 | } | |
1305 | ||
1306 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
1307 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, | |
1308 | tmp.hook_entry, tmp.underflow); | |
1309 | if (ret != 0) | |
1310 | goto free_newinfo; | |
1311 | ||
1312 | duprintf("ip_tables: Translated table\n"); | |
1313 | ||
34bd137b | 1314 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1315 | tmp.num_counters, tmp.counters); |
2722971c DM |
1316 | if (ret) |
1317 | goto free_newinfo_untrans; | |
1318 | return 0; | |
1319 | ||
1320 | free_newinfo_untrans: | |
9c547959 | 1321 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
2722971c DM |
1322 | free_newinfo: |
1323 | xt_free_table_info(newinfo); | |
1324 | return ret; | |
1325 | } | |
1326 | ||
942e4a2b SH |
1327 | /* We're lazy, and add to the first CPU; overflow works its fey magic |
1328 | * and everything is OK. */ | |
1329 | static int | |
1330 | add_counter_to_entry(struct ipt_entry *e, | |
1331 | const struct xt_counters addme[], | |
1332 | unsigned int *i) | |
1333 | { | |
1334 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1335 | ||
1336 | (*i)++; | |
1337 | return 0; | |
1338 | } | |
2722971c DM |
1339 | |
1340 | static int | |
34bd137b | 1341 | do_add_counters(struct net *net, void __user *user, unsigned int len, int compat) |
2722971c | 1342 | { |
942e4a2b | 1343 | unsigned int i, curcpu; |
2722971c DM |
1344 | struct xt_counters_info tmp; |
1345 | struct xt_counters *paddc; | |
1346 | unsigned int num_counters; | |
5452e425 | 1347 | const char *name; |
2722971c DM |
1348 | int size; |
1349 | void *ptmp; | |
e60a13e0 | 1350 | struct xt_table *t; |
5452e425 | 1351 | const struct xt_table_info *private; |
2722971c DM |
1352 | int ret = 0; |
1353 | void *loc_cpu_entry; | |
1354 | #ifdef CONFIG_COMPAT | |
1355 | struct compat_xt_counters_info compat_tmp; | |
1356 | ||
1357 | if (compat) { | |
1358 | ptmp = &compat_tmp; | |
1359 | size = sizeof(struct compat_xt_counters_info); | |
1360 | } else | |
1361 | #endif | |
1362 | { | |
1363 | ptmp = &tmp; | |
1364 | size = sizeof(struct xt_counters_info); | |
1365 | } | |
1366 | ||
1367 | if (copy_from_user(ptmp, user, size) != 0) | |
1368 | return -EFAULT; | |
1369 | ||
1370 | #ifdef CONFIG_COMPAT | |
1371 | if (compat) { | |
1372 | num_counters = compat_tmp.num_counters; | |
1373 | name = compat_tmp.name; | |
1374 | } else | |
1375 | #endif | |
1376 | { | |
1377 | num_counters = tmp.num_counters; | |
1378 | name = tmp.name; | |
1379 | } | |
1380 | ||
1381 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1382 | return -EINVAL; | |
1383 | ||
1384 | paddc = vmalloc_node(len - size, numa_node_id()); | |
1385 | if (!paddc) | |
1386 | return -ENOMEM; | |
1387 | ||
1388 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1389 | ret = -EFAULT; | |
1390 | goto free; | |
1391 | } | |
1392 | ||
34bd137b | 1393 | t = xt_find_table_lock(net, AF_INET, name); |
2722971c DM |
1394 | if (!t || IS_ERR(t)) { |
1395 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1396 | goto free; | |
1397 | } | |
1398 | ||
942e4a2b | 1399 | local_bh_disable(); |
2722971c DM |
1400 | private = t->private; |
1401 | if (private->number != num_counters) { | |
1402 | ret = -EINVAL; | |
1403 | goto unlock_up_free; | |
1404 | } | |
1405 | ||
1406 | i = 0; | |
1407 | /* Choose the copy that is on our node */ | |
942e4a2b SH |
1408 | curcpu = smp_processor_id(); |
1409 | loc_cpu_entry = private->entries[curcpu]; | |
1410 | xt_info_wrlock(curcpu); | |
2722971c DM |
1411 | IPT_ENTRY_ITERATE(loc_cpu_entry, |
1412 | private->size, | |
1413 | add_counter_to_entry, | |
1414 | paddc, | |
1415 | &i); | |
942e4a2b | 1416 | xt_info_wrunlock(curcpu); |
2722971c | 1417 | unlock_up_free: |
942e4a2b | 1418 | local_bh_enable(); |
2722971c DM |
1419 | xt_table_unlock(t); |
1420 | module_put(t->me); | |
1421 | free: | |
1422 | vfree(paddc); | |
1423 | ||
1424 | return ret; | |
1425 | } | |
1426 | ||
1427 | #ifdef CONFIG_COMPAT | |
1428 | struct compat_ipt_replace { | |
1429 | char name[IPT_TABLE_MAXNAMELEN]; | |
1430 | u32 valid_hooks; | |
1431 | u32 num_entries; | |
1432 | u32 size; | |
6e23ae2a PM |
1433 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1434 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c DM |
1435 | u32 num_counters; |
1436 | compat_uptr_t counters; /* struct ipt_counters * */ | |
1437 | struct compat_ipt_entry entries[0]; | |
1438 | }; | |
1439 | ||
a18aa31b PM |
1440 | static int |
1441 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1442 | unsigned int *size, struct xt_counters *counters, |
a18aa31b | 1443 | unsigned int *i) |
2722971c | 1444 | { |
3e597c60 | 1445 | struct ipt_entry_target *t; |
2722971c DM |
1446 | struct compat_ipt_entry __user *ce; |
1447 | u_int16_t target_offset, next_offset; | |
1448 | compat_uint_t origsize; | |
1449 | int ret; | |
1450 | ||
1451 | ret = -EFAULT; | |
1452 | origsize = *size; | |
1453 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
7800007c | 1454 | if (copy_to_user(ce, e, sizeof(struct ipt_entry))) |
2722971c DM |
1455 | goto out; |
1456 | ||
a18aa31b PM |
1457 | if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i]))) |
1458 | goto out; | |
1459 | ||
2722971c | 1460 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1461 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1462 | ||
ac8e27fd | 1463 | ret = IPT_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size); |
2722971c DM |
1464 | target_offset = e->target_offset - (origsize - *size); |
1465 | if (ret) | |
1466 | goto out; | |
1467 | t = ipt_get_target(e); | |
9fa492cd | 1468 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c DM |
1469 | if (ret) |
1470 | goto out; | |
1471 | ret = -EFAULT; | |
1472 | next_offset = e->next_offset - (origsize - *size); | |
7800007c | 1473 | if (put_user(target_offset, &ce->target_offset)) |
2722971c | 1474 | goto out; |
7800007c | 1475 | if (put_user(next_offset, &ce->next_offset)) |
2722971c | 1476 | goto out; |
a18aa31b PM |
1477 | |
1478 | (*i)++; | |
2722971c DM |
1479 | return 0; |
1480 | out: | |
1481 | return ret; | |
1482 | } | |
1483 | ||
022748a9 | 1484 | static int |
4c1b52bc | 1485 | compat_find_calc_match(struct ipt_entry_match *m, |
4b478248 PM |
1486 | const char *name, |
1487 | const struct ipt_ip *ip, | |
1488 | unsigned int hookmask, | |
b0a6363c | 1489 | int *size, unsigned int *i) |
2722971c | 1490 | { |
6709dbbb | 1491 | struct xt_match *match; |
2722971c DM |
1492 | |
1493 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, | |
4b478248 | 1494 | m->u.user.revision), |
2722971c DM |
1495 | "ipt_%s", m->u.user.name); |
1496 | if (IS_ERR(match) || !match) { | |
1497 | duprintf("compat_check_calc_match: `%s' not found\n", | |
4b478248 | 1498 | m->u.user.name); |
2722971c DM |
1499 | return match ? PTR_ERR(match) : -ENOENT; |
1500 | } | |
1501 | m->u.kernel.match = match; | |
9fa492cd | 1502 | *size += xt_compat_match_offset(match); |
2722971c DM |
1503 | |
1504 | (*i)++; | |
1505 | return 0; | |
1506 | } | |
1507 | ||
022748a9 | 1508 | static int |
4c1b52bc DM |
1509 | compat_release_match(struct ipt_entry_match *m, unsigned int *i) |
1510 | { | |
1511 | if (i && (*i)-- == 0) | |
1512 | return 1; | |
1513 | ||
1514 | module_put(m->u.kernel.match->me); | |
1515 | return 0; | |
1516 | } | |
1517 | ||
022748a9 | 1518 | static int |
73cd598d | 1519 | compat_release_entry(struct compat_ipt_entry *e, unsigned int *i) |
4c1b52bc DM |
1520 | { |
1521 | struct ipt_entry_target *t; | |
1522 | ||
1523 | if (i && (*i)-- == 0) | |
1524 | return 1; | |
1525 | ||
1526 | /* Cleanup all matches */ | |
73cd598d PM |
1527 | COMPAT_IPT_MATCH_ITERATE(e, compat_release_match, NULL); |
1528 | t = compat_ipt_get_target(e); | |
4c1b52bc DM |
1529 | module_put(t->u.kernel.target->me); |
1530 | return 0; | |
1531 | } | |
1532 | ||
022748a9 | 1533 | static int |
73cd598d | 1534 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1535 | struct xt_table_info *newinfo, |
1536 | unsigned int *size, | |
1537 | unsigned char *base, | |
1538 | unsigned char *limit, | |
1539 | unsigned int *hook_entries, | |
1540 | unsigned int *underflows, | |
1541 | unsigned int *i, | |
1542 | const char *name) | |
2722971c DM |
1543 | { |
1544 | struct ipt_entry_target *t; | |
6709dbbb | 1545 | struct xt_target *target; |
e5b5ef7d | 1546 | unsigned int entry_offset; |
b0a6363c PM |
1547 | unsigned int j; |
1548 | int ret, off, h; | |
2722971c DM |
1549 | |
1550 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
1551 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 | |
1552 | || (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { | |
1553 | duprintf("Bad offset %p, limit = %p\n", e, limit); | |
1554 | return -EINVAL; | |
1555 | } | |
1556 | ||
1557 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1558 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1559 | duprintf("checking: element %p size %u\n", |
1560 | e, e->next_offset); | |
1561 | return -EINVAL; | |
1562 | } | |
1563 | ||
73cd598d PM |
1564 | /* For purposes of check_entry casting the compat entry is fine */ |
1565 | ret = check_entry((struct ipt_entry *)e, name); | |
a96be246 DM |
1566 | if (ret) |
1567 | return ret; | |
590bdf7f | 1568 | |
30c08c41 | 1569 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1570 | entry_offset = (void *)e - (void *)base; |
1571 | j = 0; | |
73cd598d PM |
1572 | ret = COMPAT_IPT_MATCH_ITERATE(e, compat_find_calc_match, name, |
1573 | &e->ip, e->comefrom, &off, &j); | |
2722971c | 1574 | if (ret != 0) |
4c1b52bc | 1575 | goto release_matches; |
2722971c | 1576 | |
73cd598d | 1577 | t = compat_ipt_get_target(e); |
2722971c | 1578 | target = try_then_request_module(xt_find_target(AF_INET, |
4b478248 PM |
1579 | t->u.user.name, |
1580 | t->u.user.revision), | |
2722971c DM |
1581 | "ipt_%s", t->u.user.name); |
1582 | if (IS_ERR(target) || !target) { | |
a96be246 | 1583 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1584 | t->u.user.name); |
2722971c | 1585 | ret = target ? PTR_ERR(target) : -ENOENT; |
4c1b52bc | 1586 | goto release_matches; |
2722971c DM |
1587 | } |
1588 | t->u.kernel.target = target; | |
1589 | ||
9fa492cd | 1590 | off += xt_compat_target_offset(target); |
2722971c | 1591 | *size += off; |
b386d9f5 | 1592 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1593 | if (ret) |
1594 | goto out; | |
1595 | ||
1596 | /* Check hooks & underflows */ | |
6e23ae2a | 1597 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1598 | if ((unsigned char *)e - base == hook_entries[h]) |
1599 | newinfo->hook_entry[h] = hook_entries[h]; | |
1600 | if ((unsigned char *)e - base == underflows[h]) | |
1601 | newinfo->underflow[h] = underflows[h]; | |
1602 | } | |
1603 | ||
1604 | /* Clear counters and comefrom */ | |
73cd598d | 1605 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c DM |
1606 | e->comefrom = 0; |
1607 | ||
1608 | (*i)++; | |
1609 | return 0; | |
bec71b16 | 1610 | |
2722971c | 1611 | out: |
bec71b16 | 1612 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1613 | release_matches: |
1614 | IPT_MATCH_ITERATE(e, compat_release_match, &j); | |
2722971c DM |
1615 | return ret; |
1616 | } | |
1617 | ||
4b478248 | 1618 | static int |
73cd598d | 1619 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1620 | unsigned int *size, const char *name, |
1621 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c DM |
1622 | { |
1623 | struct ipt_entry_target *t; | |
6709dbbb | 1624 | struct xt_target *target; |
2722971c DM |
1625 | struct ipt_entry *de; |
1626 | unsigned int origsize; | |
920b868a | 1627 | int ret, h; |
2722971c DM |
1628 | |
1629 | ret = 0; | |
1630 | origsize = *size; | |
1631 | de = (struct ipt_entry *)*dstptr; | |
1632 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1633 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1634 | |
73cd598d | 1635 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1636 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1637 | ||
73cd598d PM |
1638 | ret = COMPAT_IPT_MATCH_ITERATE(e, xt_compat_match_from_user, |
1639 | dstptr, size); | |
2722971c | 1640 | if (ret) |
f6677f43 | 1641 | return ret; |
2722971c | 1642 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1643 | t = compat_ipt_get_target(e); |
2722971c | 1644 | target = t->u.kernel.target; |
9fa492cd | 1645 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1646 | |
1647 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1648 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1649 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1650 | newinfo->hook_entry[h] -= origsize - *size; | |
1651 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1652 | newinfo->underflow[h] -= origsize - *size; | |
1653 | } | |
f6677f43 DM |
1654 | return ret; |
1655 | } | |
1656 | ||
022748a9 DV |
1657 | static int |
1658 | compat_check_entry(struct ipt_entry *e, const char *name, | |
4b478248 | 1659 | unsigned int *i) |
f6677f43 | 1660 | { |
9b4fce7a | 1661 | struct xt_mtchk_param mtpar; |
b0a6363c PM |
1662 | unsigned int j; |
1663 | int ret; | |
f6677f43 | 1664 | |
4c1b52bc | 1665 | j = 0; |
9b4fce7a JE |
1666 | mtpar.table = name; |
1667 | mtpar.entryinfo = &e->ip; | |
1668 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1669 | mtpar.family = NFPROTO_IPV4; |
9b4fce7a | 1670 | ret = IPT_MATCH_ITERATE(e, check_match, &mtpar, &j); |
f6677f43 | 1671 | if (ret) |
4c1b52bc DM |
1672 | goto cleanup_matches; |
1673 | ||
1674 | ret = check_target(e, name); | |
1675 | if (ret) | |
1676 | goto cleanup_matches; | |
f6677f43 | 1677 | |
4c1b52bc DM |
1678 | (*i)++; |
1679 | return 0; | |
1680 | ||
1681 | cleanup_matches: | |
1682 | IPT_MATCH_ITERATE(e, cleanup_match, &j); | |
1683 | return ret; | |
f6677f43 DM |
1684 | } |
1685 | ||
1da177e4 | 1686 | static int |
2722971c | 1687 | translate_compat_table(const char *name, |
4b478248 PM |
1688 | unsigned int valid_hooks, |
1689 | struct xt_table_info **pinfo, | |
1690 | void **pentry0, | |
1691 | unsigned int total_size, | |
1692 | unsigned int number, | |
1693 | unsigned int *hook_entries, | |
1694 | unsigned int *underflows) | |
1da177e4 | 1695 | { |
920b868a | 1696 | unsigned int i, j; |
2722971c DM |
1697 | struct xt_table_info *newinfo, *info; |
1698 | void *pos, *entry0, *entry1; | |
1699 | unsigned int size; | |
1da177e4 | 1700 | int ret; |
1da177e4 | 1701 | |
2722971c DM |
1702 | info = *pinfo; |
1703 | entry0 = *pentry0; | |
1704 | size = total_size; | |
1705 | info->number = number; | |
1706 | ||
1707 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1708 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1709 | info->hook_entry[i] = 0xFFFFFFFF; |
1710 | info->underflow[i] = 0xFFFFFFFF; | |
1711 | } | |
1712 | ||
1713 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1714 | j = 0; |
2722971c DM |
1715 | xt_compat_lock(AF_INET); |
1716 | /* Walk through entries, checking offsets. */ | |
73cd598d PM |
1717 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
1718 | check_compat_entry_size_and_hooks, | |
1719 | info, &size, entry0, | |
1720 | entry0 + total_size, | |
1721 | hook_entries, underflows, &j, name); | |
2722971c DM |
1722 | if (ret != 0) |
1723 | goto out_unlock; | |
1724 | ||
1725 | ret = -EINVAL; | |
920b868a | 1726 | if (j != number) { |
2722971c | 1727 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1728 | j, number); |
2722971c DM |
1729 | goto out_unlock; |
1730 | } | |
1731 | ||
1732 | /* Check hooks all assigned */ | |
6e23ae2a | 1733 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1734 | /* Only hooks which are valid */ |
1735 | if (!(valid_hooks & (1 << i))) | |
1736 | continue; | |
1737 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1738 | duprintf("Invalid hook entry %u %u\n", | |
1739 | i, hook_entries[i]); | |
1740 | goto out_unlock; | |
1da177e4 | 1741 | } |
2722971c DM |
1742 | if (info->underflow[i] == 0xFFFFFFFF) { |
1743 | duprintf("Invalid underflow %u %u\n", | |
1744 | i, underflows[i]); | |
1745 | goto out_unlock; | |
1746 | } | |
1747 | } | |
1748 | ||
1749 | ret = -ENOMEM; | |
1750 | newinfo = xt_alloc_table_info(size); | |
1751 | if (!newinfo) | |
1752 | goto out_unlock; | |
1753 | ||
1754 | newinfo->number = number; | |
6e23ae2a | 1755 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1756 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1757 | newinfo->underflow[i] = info->underflow[i]; | |
1758 | } | |
1759 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1760 | pos = entry1; | |
4b478248 | 1761 | size = total_size; |
73cd598d | 1762 | ret = COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, |
9c547959 PM |
1763 | compat_copy_entry_from_user, |
1764 | &pos, &size, name, newinfo, entry1); | |
b386d9f5 | 1765 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1766 | xt_compat_unlock(AF_INET); |
1767 | if (ret) | |
1768 | goto free_newinfo; | |
1769 | ||
1770 | ret = -ELOOP; | |
1771 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1772 | goto free_newinfo; | |
1773 | ||
4c1b52bc | 1774 | i = 0; |
f6677f43 | 1775 | ret = IPT_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry, |
4b478248 | 1776 | name, &i); |
4c1b52bc DM |
1777 | if (ret) { |
1778 | j -= i; | |
73cd598d PM |
1779 | COMPAT_IPT_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i, |
1780 | compat_release_entry, &j); | |
4c1b52bc DM |
1781 | IPT_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i); |
1782 | xt_free_table_info(newinfo); | |
1783 | return ret; | |
1784 | } | |
f6677f43 | 1785 | |
2722971c | 1786 | /* And one copy for every other CPU */ |
fb1bb34d | 1787 | for_each_possible_cpu(i) |
2722971c DM |
1788 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
1789 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1790 | ||
1791 | *pinfo = newinfo; | |
1792 | *pentry0 = entry1; | |
1793 | xt_free_table_info(info); | |
1794 | return 0; | |
1da177e4 | 1795 | |
2722971c DM |
1796 | free_newinfo: |
1797 | xt_free_table_info(newinfo); | |
1798 | out: | |
73cd598d | 1799 | COMPAT_IPT_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j); |
1da177e4 | 1800 | return ret; |
2722971c | 1801 | out_unlock: |
b386d9f5 | 1802 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1803 | xt_compat_unlock(AF_INET); |
1804 | goto out; | |
1da177e4 LT |
1805 | } |
1806 | ||
1807 | static int | |
34bd137b | 1808 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1809 | { |
1810 | int ret; | |
2722971c DM |
1811 | struct compat_ipt_replace tmp; |
1812 | struct xt_table_info *newinfo; | |
1813 | void *loc_cpu_entry; | |
1da177e4 LT |
1814 | |
1815 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1816 | return -EFAULT; | |
1817 | ||
ee4bb818 | 1818 | /* overflow check */ |
259d4e41 | 1819 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1820 | return -ENOMEM; |
1821 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1822 | return -ENOMEM; | |
1823 | ||
2e4e6a17 | 1824 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1825 | if (!newinfo) |
1826 | return -ENOMEM; | |
1827 | ||
9c547959 | 1828 | /* choose the copy that is on our node/cpu */ |
31836064 ED |
1829 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
1830 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
1831 | tmp.size) != 0) { |
1832 | ret = -EFAULT; | |
1833 | goto free_newinfo; | |
1834 | } | |
1835 | ||
2722971c | 1836 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, |
4b478248 PM |
1837 | &newinfo, &loc_cpu_entry, tmp.size, |
1838 | tmp.num_entries, tmp.hook_entry, | |
1839 | tmp.underflow); | |
2722971c | 1840 | if (ret != 0) |
1da177e4 | 1841 | goto free_newinfo; |
1da177e4 | 1842 | |
2722971c | 1843 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1844 | |
34bd137b | 1845 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1846 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1847 | if (ret) |
1848 | goto free_newinfo_untrans; | |
1849 | return 0; | |
1da177e4 | 1850 | |
2722971c | 1851 | free_newinfo_untrans: |
4b478248 | 1852 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
2722971c DM |
1853 | free_newinfo: |
1854 | xt_free_table_info(newinfo); | |
1855 | return ret; | |
1856 | } | |
1da177e4 | 1857 | |
2722971c DM |
1858 | static int |
1859 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1860 | unsigned int len) |
2722971c DM |
1861 | { |
1862 | int ret; | |
1da177e4 | 1863 | |
2722971c DM |
1864 | if (!capable(CAP_NET_ADMIN)) |
1865 | return -EPERM; | |
1da177e4 | 1866 | |
2722971c DM |
1867 | switch (cmd) { |
1868 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1869 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1870 | break; |
1da177e4 | 1871 | |
2722971c | 1872 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1873 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1874 | break; |
1875 | ||
1876 | default: | |
1877 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1878 | ret = -EINVAL; | |
1879 | } | |
1da177e4 | 1880 | |
1da177e4 LT |
1881 | return ret; |
1882 | } | |
1883 | ||
4b478248 | 1884 | struct compat_ipt_get_entries { |
2722971c DM |
1885 | char name[IPT_TABLE_MAXNAMELEN]; |
1886 | compat_uint_t size; | |
1887 | struct compat_ipt_entry entrytable[0]; | |
1888 | }; | |
1da177e4 | 1889 | |
4b478248 PM |
1890 | static int |
1891 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1892 | void __user *userptr) | |
2722971c | 1893 | { |
2722971c | 1894 | struct xt_counters *counters; |
5452e425 | 1895 | const struct xt_table_info *private = table->private; |
2722971c DM |
1896 | void __user *pos; |
1897 | unsigned int size; | |
1898 | int ret = 0; | |
5452e425 | 1899 | const void *loc_cpu_entry; |
a18aa31b | 1900 | unsigned int i = 0; |
1da177e4 | 1901 | |
2722971c DM |
1902 | counters = alloc_counters(table); |
1903 | if (IS_ERR(counters)) | |
1904 | return PTR_ERR(counters); | |
1905 | ||
1906 | /* choose the copy that is on our node/cpu, ... | |
1907 | * This choice is lazy (because current thread is | |
1908 | * allowed to migrate to another cpu) | |
1909 | */ | |
1910 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1911 | pos = userptr; | |
1912 | size = total_size; | |
1913 | ret = IPT_ENTRY_ITERATE(loc_cpu_entry, total_size, | |
a18aa31b PM |
1914 | compat_copy_entry_to_user, |
1915 | &pos, &size, counters, &i); | |
2722971c | 1916 | |
2722971c DM |
1917 | vfree(counters); |
1918 | return ret; | |
1da177e4 LT |
1919 | } |
1920 | ||
1921 | static int | |
34bd137b AD |
1922 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1923 | int *len) | |
1da177e4 | 1924 | { |
2722971c DM |
1925 | int ret; |
1926 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1927 | struct xt_table *t; |
1da177e4 | 1928 | |
2722971c | 1929 | if (*len < sizeof(get)) { |
c9d8fe13 | 1930 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1931 | return -EINVAL; |
2722971c | 1932 | } |
1da177e4 | 1933 | |
2722971c DM |
1934 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1935 | return -EFAULT; | |
1da177e4 | 1936 | |
2722971c | 1937 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1938 | duprintf("compat_get_entries: %u != %zu\n", |
1939 | *len, sizeof(get) + get.size); | |
2722971c | 1940 | return -EINVAL; |
1da177e4 LT |
1941 | } |
1942 | ||
2722971c | 1943 | xt_compat_lock(AF_INET); |
34bd137b | 1944 | t = xt_find_table_lock(net, AF_INET, get.name); |
2722971c | 1945 | if (t && !IS_ERR(t)) { |
5452e425 | 1946 | const struct xt_table_info *private = t->private; |
2722971c | 1947 | struct xt_table_info info; |
9c547959 | 1948 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1949 | ret = compat_table_info(private, &info); |
1950 | if (!ret && get.size == info.size) { | |
1951 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 1952 | t, uptr->entrytable); |
2722971c DM |
1953 | } else if (!ret) { |
1954 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1955 | private->size, get.size); |
544473c1 | 1956 | ret = -EAGAIN; |
2722971c | 1957 | } |
b386d9f5 | 1958 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1959 | module_put(t->me); |
1960 | xt_table_unlock(t); | |
1961 | } else | |
1da177e4 | 1962 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1963 | |
2722971c DM |
1964 | xt_compat_unlock(AF_INET); |
1965 | return ret; | |
1966 | } | |
1da177e4 | 1967 | |
79030ed0 PM |
1968 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1969 | ||
2722971c DM |
1970 | static int |
1971 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1972 | { | |
1973 | int ret; | |
1da177e4 | 1974 | |
82fac054 BS |
1975 | if (!capable(CAP_NET_ADMIN)) |
1976 | return -EPERM; | |
1977 | ||
2722971c DM |
1978 | switch (cmd) { |
1979 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1980 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1981 | break; |
1982 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1983 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1984 | break; |
1985 | default: | |
79030ed0 | 1986 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1987 | } |
1da177e4 LT |
1988 | return ret; |
1989 | } | |
2722971c | 1990 | #endif |
1da177e4 LT |
1991 | |
1992 | static int | |
9c547959 | 1993 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
1994 | { |
1995 | int ret; | |
1996 | ||
1997 | if (!capable(CAP_NET_ADMIN)) | |
1998 | return -EPERM; | |
1999 | ||
2000 | switch (cmd) { | |
2001 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 2002 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2003 | break; |
2004 | ||
2005 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2006 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2007 | break; |
2008 | ||
2009 | default: | |
2010 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
2011 | ret = -EINVAL; | |
2012 | } | |
2013 | ||
2014 | return ret; | |
2015 | } | |
2016 | ||
2017 | static int | |
2018 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2019 | { | |
2020 | int ret; | |
2021 | ||
2022 | if (!capable(CAP_NET_ADMIN)) | |
2023 | return -EPERM; | |
2024 | ||
2025 | switch (cmd) { | |
2722971c | 2026 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2027 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2028 | break; |
1da177e4 | 2029 | |
2722971c | 2030 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2031 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2032 | break; |
1da177e4 LT |
2033 | |
2034 | case IPT_SO_GET_REVISION_MATCH: | |
2035 | case IPT_SO_GET_REVISION_TARGET: { | |
2036 | struct ipt_get_revision rev; | |
2e4e6a17 | 2037 | int target; |
1da177e4 LT |
2038 | |
2039 | if (*len != sizeof(rev)) { | |
2040 | ret = -EINVAL; | |
2041 | break; | |
2042 | } | |
2043 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2044 | ret = -EFAULT; | |
2045 | break; | |
2046 | } | |
2047 | ||
2048 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2049 | target = 1; |
1da177e4 | 2050 | else |
2e4e6a17 | 2051 | target = 0; |
1da177e4 | 2052 | |
2e4e6a17 HW |
2053 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2054 | rev.revision, | |
2055 | target, &ret), | |
1da177e4 LT |
2056 | "ipt_%s", rev.name); |
2057 | break; | |
2058 | } | |
2059 | ||
2060 | default: | |
2061 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2062 | ret = -EINVAL; | |
2063 | } | |
2064 | ||
2065 | return ret; | |
2066 | } | |
2067 | ||
35aad0ff JE |
2068 | struct xt_table *ipt_register_table(struct net *net, |
2069 | const struct xt_table *table, | |
44d34e72 | 2070 | const struct ipt_replace *repl) |
1da177e4 LT |
2071 | { |
2072 | int ret; | |
2e4e6a17 | 2073 | struct xt_table_info *newinfo; |
259d4e41 | 2074 | struct xt_table_info bootstrap |
1da177e4 | 2075 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 2076 | void *loc_cpu_entry; |
a98da11d | 2077 | struct xt_table *new_table; |
1da177e4 | 2078 | |
2e4e6a17 | 2079 | newinfo = xt_alloc_table_info(repl->size); |
44d34e72 AD |
2080 | if (!newinfo) { |
2081 | ret = -ENOMEM; | |
2082 | goto out; | |
2083 | } | |
1da177e4 | 2084 | |
9c547959 | 2085 | /* choose the copy on our node/cpu, but dont care about preemption */ |
31836064 ED |
2086 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
2087 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
2088 | |
2089 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 2090 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
2091 | repl->num_entries, |
2092 | repl->hook_entry, | |
2093 | repl->underflow); | |
44d34e72 AD |
2094 | if (ret != 0) |
2095 | goto out_free; | |
1da177e4 | 2096 | |
44d34e72 | 2097 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2098 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2099 | ret = PTR_ERR(new_table); |
2100 | goto out_free; | |
1da177e4 LT |
2101 | } |
2102 | ||
44d34e72 AD |
2103 | return new_table; |
2104 | ||
2105 | out_free: | |
2106 | xt_free_table_info(newinfo); | |
2107 | out: | |
2108 | return ERR_PTR(ret); | |
1da177e4 LT |
2109 | } |
2110 | ||
e60a13e0 | 2111 | void ipt_unregister_table(struct xt_table *table) |
1da177e4 | 2112 | { |
2e4e6a17 | 2113 | struct xt_table_info *private; |
31836064 | 2114 | void *loc_cpu_entry; |
df200969 | 2115 | struct module *table_owner = table->me; |
31836064 | 2116 | |
e905a9ed | 2117 | private = xt_unregister_table(table); |
1da177e4 LT |
2118 | |
2119 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
2120 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
2121 | IPT_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); | |
df200969 AD |
2122 | if (private->number > private->initial_entries) |
2123 | module_put(table_owner); | |
2e4e6a17 | 2124 | xt_free_table_info(private); |
1da177e4 LT |
2125 | } |
2126 | ||
2127 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2128 | static inline bool |
1da177e4 LT |
2129 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2130 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2131 | bool invert) |
1da177e4 | 2132 | { |
9c547959 PM |
2133 | return ((test_type == 0xFF) || |
2134 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2135 | ^ invert; |
2136 | } | |
2137 | ||
1d93a9cb | 2138 | static bool |
f7108a20 | 2139 | icmp_match(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 2140 | { |
5452e425 JE |
2141 | const struct icmphdr *ic; |
2142 | struct icmphdr _icmph; | |
f7108a20 | 2143 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2144 | |
2145 | /* Must not be a fragment. */ | |
f7108a20 | 2146 | if (par->fragoff != 0) |
1d93a9cb | 2147 | return false; |
1da177e4 | 2148 | |
f7108a20 | 2149 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2150 | if (ic == NULL) { |
2151 | /* We've been asked to examine this packet, and we | |
2152 | * can't. Hence, no choice but to drop. | |
2153 | */ | |
2154 | duprintf("Dropping evil ICMP tinygram.\n"); | |
f7108a20 | 2155 | *par->hotdrop = true; |
1d93a9cb | 2156 | return false; |
1da177e4 LT |
2157 | } |
2158 | ||
2159 | return icmp_type_code_match(icmpinfo->type, | |
2160 | icmpinfo->code[0], | |
2161 | icmpinfo->code[1], | |
2162 | ic->type, ic->code, | |
2163 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2164 | } | |
2165 | ||
9b4fce7a | 2166 | static bool icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2167 | { |
9b4fce7a | 2168 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2169 | |
1d5cd909 PM |
2170 | /* Must specify no unknown invflags */ |
2171 | return !(icmpinfo->invflags & ~IPT_ICMP_INV); | |
1da177e4 LT |
2172 | } |
2173 | ||
2174 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 2175 | static struct xt_target ipt_standard_target __read_mostly = { |
1da177e4 | 2176 | .name = IPT_STANDARD_TARGET, |
1d5cd909 | 2177 | .targetsize = sizeof(int), |
4ba351cf | 2178 | .family = NFPROTO_IPV4, |
2722971c | 2179 | #ifdef CONFIG_COMPAT |
9fa492cd PM |
2180 | .compatsize = sizeof(compat_int_t), |
2181 | .compat_from_user = compat_standard_from_user, | |
2182 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2183 | #endif |
1da177e4 LT |
2184 | }; |
2185 | ||
9f15c530 | 2186 | static struct xt_target ipt_error_target __read_mostly = { |
1da177e4 LT |
2187 | .name = IPT_ERROR_TARGET, |
2188 | .target = ipt_error, | |
1d5cd909 | 2189 | .targetsize = IPT_FUNCTION_MAXNAMELEN, |
4ba351cf | 2190 | .family = NFPROTO_IPV4, |
1da177e4 LT |
2191 | }; |
2192 | ||
2193 | static struct nf_sockopt_ops ipt_sockopts = { | |
2194 | .pf = PF_INET, | |
2195 | .set_optmin = IPT_BASE_CTL, | |
2196 | .set_optmax = IPT_SO_SET_MAX+1, | |
2197 | .set = do_ipt_set_ctl, | |
2722971c DM |
2198 | #ifdef CONFIG_COMPAT |
2199 | .compat_set = compat_do_ipt_set_ctl, | |
2200 | #endif | |
1da177e4 LT |
2201 | .get_optmin = IPT_BASE_CTL, |
2202 | .get_optmax = IPT_SO_GET_MAX+1, | |
2203 | .get = do_ipt_get_ctl, | |
2722971c DM |
2204 | #ifdef CONFIG_COMPAT |
2205 | .compat_get = compat_do_ipt_get_ctl, | |
2206 | #endif | |
16fcec35 | 2207 | .owner = THIS_MODULE, |
1da177e4 LT |
2208 | }; |
2209 | ||
9f15c530 | 2210 | static struct xt_match icmp_matchstruct __read_mostly = { |
1da177e4 | 2211 | .name = "icmp", |
1d5cd909 PM |
2212 | .match = icmp_match, |
2213 | .matchsize = sizeof(struct ipt_icmp), | |
9c547959 | 2214 | .checkentry = icmp_checkentry, |
1d5cd909 | 2215 | .proto = IPPROTO_ICMP, |
4ba351cf | 2216 | .family = NFPROTO_IPV4, |
1da177e4 LT |
2217 | }; |
2218 | ||
3cb609d5 AD |
2219 | static int __net_init ip_tables_net_init(struct net *net) |
2220 | { | |
383ca5b8 | 2221 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
2222 | } |
2223 | ||
2224 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2225 | { | |
383ca5b8 | 2226 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
2227 | } |
2228 | ||
2229 | static struct pernet_operations ip_tables_net_ops = { | |
2230 | .init = ip_tables_net_init, | |
2231 | .exit = ip_tables_net_exit, | |
2232 | }; | |
2233 | ||
65b4b4e8 | 2234 | static int __init ip_tables_init(void) |
1da177e4 LT |
2235 | { |
2236 | int ret; | |
2237 | ||
3cb609d5 | 2238 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2239 | if (ret < 0) |
2240 | goto err1; | |
2e4e6a17 | 2241 | |
1da177e4 | 2242 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
2243 | ret = xt_register_target(&ipt_standard_target); |
2244 | if (ret < 0) | |
2245 | goto err2; | |
2246 | ret = xt_register_target(&ipt_error_target); | |
2247 | if (ret < 0) | |
2248 | goto err3; | |
2249 | ret = xt_register_match(&icmp_matchstruct); | |
2250 | if (ret < 0) | |
2251 | goto err4; | |
1da177e4 LT |
2252 | |
2253 | /* Register setsockopt */ | |
2254 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2255 | if (ret < 0) |
2256 | goto err5; | |
1da177e4 | 2257 | |
0236e667 | 2258 | printk(KERN_INFO "ip_tables: (C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2259 | return 0; |
0eff66e6 PM |
2260 | |
2261 | err5: | |
2262 | xt_unregister_match(&icmp_matchstruct); | |
2263 | err4: | |
2264 | xt_unregister_target(&ipt_error_target); | |
2265 | err3: | |
2266 | xt_unregister_target(&ipt_standard_target); | |
2267 | err2: | |
3cb609d5 | 2268 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2269 | err1: |
2270 | return ret; | |
1da177e4 LT |
2271 | } |
2272 | ||
65b4b4e8 | 2273 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2274 | { |
2275 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2276 | |
a45049c5 PNA |
2277 | xt_unregister_match(&icmp_matchstruct); |
2278 | xt_unregister_target(&ipt_error_target); | |
2279 | xt_unregister_target(&ipt_standard_target); | |
2e4e6a17 | 2280 | |
3cb609d5 | 2281 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2282 | } |
2283 | ||
2284 | EXPORT_SYMBOL(ipt_register_table); | |
2285 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2286 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2287 | module_init(ip_tables_init); |
2288 | module_exit(ip_tables_fini); |