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> |
f229f6ce | 6 | * Copyright (C) 2006-2010 Patrick McHardy <kaber@trash.net> |
1da177e4 LT |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
1da177e4 | 11 | */ |
90e7d4ab | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
1da177e4 | 13 | #include <linux/cache.h> |
4fc268d2 | 14 | #include <linux/capability.h> |
1da177e4 LT |
15 | #include <linux/skbuff.h> |
16 | #include <linux/kmod.h> | |
17 | #include <linux/vmalloc.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/module.h> | |
1da177e4 LT |
20 | #include <linux/icmp.h> |
21 | #include <net/ip.h> | |
2722971c | 22 | #include <net/compat.h> |
1da177e4 | 23 | #include <asm/uaccess.h> |
57b47a53 | 24 | #include <linux/mutex.h> |
1da177e4 LT |
25 | #include <linux/proc_fs.h> |
26 | #include <linux/err.h> | |
c8923c6b | 27 | #include <linux/cpumask.h> |
1da177e4 | 28 | |
2e4e6a17 | 29 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 30 | #include <linux/netfilter_ipv4/ip_tables.h> |
f01ffbd6 | 31 | #include <net/netfilter/nf_log.h> |
e3eaa991 | 32 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
33 | |
34 | MODULE_LICENSE("GPL"); | |
35 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
36 | MODULE_DESCRIPTION("IPv4 packet filter"); | |
37 | ||
38 | /*#define DEBUG_IP_FIREWALL*/ | |
39 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ | |
40 | /*#define DEBUG_IP_FIREWALL_USER*/ | |
41 | ||
42 | #ifdef DEBUG_IP_FIREWALL | |
ff67e4e4 | 43 | #define dprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
44 | #else |
45 | #define dprintf(format, args...) | |
46 | #endif | |
47 | ||
48 | #ifdef DEBUG_IP_FIREWALL_USER | |
ff67e4e4 | 49 | #define duprintf(format, args...) pr_info(format , ## args) |
1da177e4 LT |
50 | #else |
51 | #define duprintf(format, args...) | |
52 | #endif | |
53 | ||
54 | #ifdef CONFIG_NETFILTER_DEBUG | |
af567603 | 55 | #define IP_NF_ASSERT(x) WARN_ON(!(x)) |
1da177e4 LT |
56 | #else |
57 | #define IP_NF_ASSERT(x) | |
58 | #endif | |
1da177e4 LT |
59 | |
60 | #if 0 | |
61 | /* All the better to debug you with... */ | |
62 | #define static | |
63 | #define inline | |
64 | #endif | |
65 | ||
e3eaa991 JE |
66 | void *ipt_alloc_initial_table(const struct xt_table *info) |
67 | { | |
68 | return xt_alloc_initial_table(ipt, IPT); | |
69 | } | |
70 | EXPORT_SYMBOL_GPL(ipt_alloc_initial_table); | |
71 | ||
1da177e4 | 72 | /* Returns whether matches rule or not. */ |
022748a9 | 73 | /* Performance critical - called for every packet */ |
9c547959 | 74 | static inline bool |
1da177e4 LT |
75 | ip_packet_match(const struct iphdr *ip, |
76 | const char *indev, | |
77 | const char *outdev, | |
78 | const struct ipt_ip *ipinfo, | |
79 | int isfrag) | |
80 | { | |
1da177e4 LT |
81 | unsigned long ret; |
82 | ||
e79ec50b | 83 | #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) |
1da177e4 LT |
84 | |
85 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, | |
3666ed1c JP |
86 | IPT_INV_SRCIP) || |
87 | FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, | |
88 | IPT_INV_DSTIP)) { | |
1da177e4 LT |
89 | dprintf("Source or dest mismatch.\n"); |
90 | ||
cffee385 HH |
91 | dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n", |
92 | &ip->saddr, &ipinfo->smsk.s_addr, &ipinfo->src.s_addr, | |
1da177e4 | 93 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); |
cffee385 HH |
94 | dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n", |
95 | &ip->daddr, &ipinfo->dmsk.s_addr, &ipinfo->dst.s_addr, | |
1da177e4 | 96 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); |
9c547959 | 97 | return false; |
1da177e4 LT |
98 | } |
99 | ||
b8dfe498 | 100 | ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask); |
1da177e4 LT |
101 | |
102 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { | |
103 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
104 | indev, ipinfo->iniface, | |
27951a01 | 105 | ipinfo->invflags & IPT_INV_VIA_IN ? " (INV)" : ""); |
9c547959 | 106 | return false; |
1da177e4 LT |
107 | } |
108 | ||
b8dfe498 | 109 | ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
1da177e4 LT |
110 | |
111 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { | |
112 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
113 | outdev, ipinfo->outiface, | |
27951a01 | 114 | ipinfo->invflags & IPT_INV_VIA_OUT ? " (INV)" : ""); |
9c547959 | 115 | return false; |
1da177e4 LT |
116 | } |
117 | ||
118 | /* Check specific protocol */ | |
3666ed1c JP |
119 | if (ipinfo->proto && |
120 | FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { | |
1da177e4 LT |
121 | dprintf("Packet protocol %hi does not match %hi.%s\n", |
122 | ip->protocol, ipinfo->proto, | |
27951a01 | 123 | ipinfo->invflags & IPT_INV_PROTO ? " (INV)" : ""); |
9c547959 | 124 | return false; |
1da177e4 LT |
125 | } |
126 | ||
127 | /* If we have a fragment rule but the packet is not a fragment | |
128 | * then we return zero */ | |
129 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { | |
130 | dprintf("Fragment rule but not fragment.%s\n", | |
131 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); | |
9c547959 | 132 | return false; |
1da177e4 LT |
133 | } |
134 | ||
9c547959 | 135 | return true; |
1da177e4 LT |
136 | } |
137 | ||
022748a9 | 138 | static bool |
1da177e4 LT |
139 | ip_checkentry(const struct ipt_ip *ip) |
140 | { | |
141 | if (ip->flags & ~IPT_F_MASK) { | |
142 | duprintf("Unknown flag bits set: %08X\n", | |
143 | ip->flags & ~IPT_F_MASK); | |
ccb79bdc | 144 | return false; |
1da177e4 LT |
145 | } |
146 | if (ip->invflags & ~IPT_INV_MASK) { | |
147 | duprintf("Unknown invflag bits set: %08X\n", | |
148 | ip->invflags & ~IPT_INV_MASK); | |
ccb79bdc | 149 | return false; |
1da177e4 | 150 | } |
ccb79bdc | 151 | return true; |
1da177e4 LT |
152 | } |
153 | ||
154 | static unsigned int | |
4b560b44 | 155 | ipt_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 156 | { |
e87cc472 | 157 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
158 | |
159 | return NF_DROP; | |
160 | } | |
161 | ||
022748a9 | 162 | /* Performance critical */ |
1da177e4 | 163 | static inline struct ipt_entry * |
d5d1baa1 | 164 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
165 | { |
166 | return (struct ipt_entry *)(base + offset); | |
167 | } | |
168 | ||
ba9dda3a | 169 | /* All zeroes == unconditional rule. */ |
022748a9 | 170 | /* Mildly perf critical (only if packet tracing is on) */ |
54d83fc7 | 171 | static inline bool unconditional(const struct ipt_entry *e) |
ba9dda3a | 172 | { |
47901dc2 | 173 | static const struct ipt_ip uncond; |
ba9dda3a | 174 | |
54d83fc7 FW |
175 | return e->target_offset == sizeof(struct ipt_entry) && |
176 | memcmp(&e->ip, &uncond, sizeof(uncond)) == 0; | |
e79ec50b | 177 | #undef FWINV |
ba9dda3a JK |
178 | } |
179 | ||
d5d1baa1 | 180 | /* for const-correctness */ |
87a2e70d | 181 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
182 | ipt_get_target_c(const struct ipt_entry *e) |
183 | { | |
184 | return ipt_get_target((struct ipt_entry *)e); | |
185 | } | |
186 | ||
f0165888 | 187 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
022748a9 | 188 | static const char *const hooknames[] = { |
6e23ae2a PM |
189 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
190 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 191 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
192 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
193 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
194 | }; |
195 | ||
196 | enum nf_ip_trace_comments { | |
197 | NF_IP_TRACE_COMMENT_RULE, | |
198 | NF_IP_TRACE_COMMENT_RETURN, | |
199 | NF_IP_TRACE_COMMENT_POLICY, | |
200 | }; | |
201 | ||
022748a9 | 202 | static const char *const comments[] = { |
ba9dda3a JK |
203 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
204 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
205 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
206 | }; | |
207 | ||
208 | static struct nf_loginfo trace_loginfo = { | |
209 | .type = NF_LOG_TYPE_LOG, | |
210 | .u = { | |
211 | .log = { | |
212 | .level = 4, | |
213 | .logflags = NF_LOG_MASK, | |
214 | }, | |
215 | }, | |
216 | }; | |
217 | ||
022748a9 | 218 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 219 | static inline int |
d5d1baa1 | 220 | get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e, |
4f2f6f23 JE |
221 | const char *hookname, const char **chainname, |
222 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 223 | { |
87a2e70d | 224 | const struct xt_standard_target *t = (void *)ipt_get_target_c(s); |
ba9dda3a | 225 | |
243bf6e2 | 226 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
227 | /* Head of user chain: ERROR target with chainname */ |
228 | *chainname = t->target.data; | |
229 | (*rulenum) = 0; | |
230 | } else if (s == e) { | |
231 | (*rulenum)++; | |
232 | ||
54d83fc7 | 233 | if (unconditional(s) && |
3666ed1c | 234 | strcmp(t->target.u.kernel.target->name, |
243bf6e2 | 235 | XT_STANDARD_TARGET) == 0 && |
54d83fc7 | 236 | t->verdict < 0) { |
ba9dda3a JK |
237 | /* Tail of chains: STANDARD target (return/policy) */ |
238 | *comment = *chainname == hookname | |
4f2f6f23 JE |
239 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
240 | : comments[NF_IP_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
241 | } |
242 | return 1; | |
243 | } else | |
244 | (*rulenum)++; | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
9dff2c96 EB |
249 | static void trace_packet(struct net *net, |
250 | const struct sk_buff *skb, | |
ba9dda3a JK |
251 | unsigned int hook, |
252 | const struct net_device *in, | |
253 | const struct net_device *out, | |
ecb6f85e | 254 | const char *tablename, |
d5d1baa1 JE |
255 | const struct xt_table_info *private, |
256 | const struct ipt_entry *e) | |
ba9dda3a | 257 | { |
5452e425 | 258 | const struct ipt_entry *root; |
4f2f6f23 | 259 | const char *hookname, *chainname, *comment; |
72b2b1dd | 260 | const struct ipt_entry *iter; |
ba9dda3a JK |
261 | unsigned int rulenum = 0; |
262 | ||
482cfc31 | 263 | root = get_entry(private->entries, private->hook_entry[hook]); |
ba9dda3a | 264 | |
4f2f6f23 JE |
265 | hookname = chainname = hooknames[hook]; |
266 | comment = comments[NF_IP_TRACE_COMMENT_RULE]; | |
ba9dda3a | 267 | |
72b2b1dd JE |
268 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
269 | if (get_chainname_rulenum(iter, e, hookname, | |
270 | &chainname, &comment, &rulenum) != 0) | |
271 | break; | |
ba9dda3a | 272 | |
4017a7ee PNA |
273 | nf_log_trace(net, AF_INET, hook, skb, in, out, &trace_loginfo, |
274 | "TRACE: %s:%s:%s:%u ", | |
275 | tablename, chainname, comment, rulenum); | |
ba9dda3a JK |
276 | } |
277 | #endif | |
278 | ||
6c7941de | 279 | static inline |
98e86403 JE |
280 | struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry) |
281 | { | |
282 | return (void *)entry + entry->next_offset; | |
283 | } | |
284 | ||
1da177e4 LT |
285 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
286 | unsigned int | |
3db05fea | 287 | ipt_do_table(struct sk_buff *skb, |
1c491ba2 | 288 | const struct nf_hook_state *state, |
e60a13e0 | 289 | struct xt_table *table) |
1da177e4 | 290 | { |
6cb8ff3f | 291 | unsigned int hook = state->hook; |
1da177e4 | 292 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
5452e425 | 293 | const struct iphdr *ip; |
1da177e4 LT |
294 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
295 | unsigned int verdict = NF_DROP; | |
296 | const char *indev, *outdev; | |
d5d1baa1 | 297 | const void *table_base; |
f3c5c1bf | 298 | struct ipt_entry *e, **jumpstack; |
7814b6ec | 299 | unsigned int stackidx, cpu; |
d5d1baa1 | 300 | const struct xt_table_info *private; |
de74c169 | 301 | struct xt_action_param acpar; |
7f5c6d4f | 302 | unsigned int addend; |
1da177e4 LT |
303 | |
304 | /* Initialization */ | |
7814b6ec | 305 | stackidx = 0; |
3db05fea | 306 | ip = ip_hdr(skb); |
1c491ba2 DM |
307 | indev = state->in ? state->in->name : nulldevname; |
308 | outdev = state->out ? state->out->name : nulldevname; | |
1da177e4 LT |
309 | /* We handle fragments by dealing with the first fragment as |
310 | * if it was a normal packet. All other fragments are treated | |
311 | * normally, except that they will NEVER match rules that ask | |
312 | * things we don't know, ie. tcp syn flag or ports). If the | |
313 | * rule is also a fragment-specific rule, non-fragments won't | |
314 | * match it. */ | |
de74c169 JE |
315 | acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
316 | acpar.thoff = ip_hdrlen(skb); | |
b4ba2611 | 317 | acpar.hotdrop = false; |
156c196f | 318 | acpar.net = state->net; |
1c491ba2 DM |
319 | acpar.in = state->in; |
320 | acpar.out = state->out; | |
de74c169 JE |
321 | acpar.family = NFPROTO_IPV4; |
322 | acpar.hooknum = hook; | |
1da177e4 | 323 | |
1da177e4 | 324 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
7f5c6d4f ED |
325 | local_bh_disable(); |
326 | addend = xt_write_recseq_begin(); | |
942e4a2b | 327 | private = table->private; |
f3c5c1bf | 328 | cpu = smp_processor_id(); |
b416c144 WD |
329 | /* |
330 | * Ensure we load private-> members after we've fetched the base | |
331 | * pointer. | |
332 | */ | |
333 | smp_read_barrier_depends(); | |
482cfc31 | 334 | table_base = private->entries; |
f3c5c1bf | 335 | jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; |
7814b6ec FW |
336 | |
337 | /* Switch to alternate jumpstack if we're being invoked via TEE. | |
338 | * TEE issues XT_CONTINUE verdict on original skb so we must not | |
339 | * clobber the jumpstack. | |
340 | * | |
341 | * For recursion via REJECT or SYNPROXY the stack will be clobbered | |
342 | * but it is no problem since absolute verdict is issued by these. | |
343 | */ | |
dcebd315 FW |
344 | if (static_key_false(&xt_tee_enabled)) |
345 | jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated); | |
78454473 | 346 | |
2e4e6a17 | 347 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 348 | |
7814b6ec FW |
349 | pr_debug("Entering %s(hook %u), UF %p\n", |
350 | table->name, hook, | |
f3c5c1bf | 351 | get_entry(table_base, private->underflow[hook])); |
1da177e4 LT |
352 | |
353 | do { | |
87a2e70d | 354 | const struct xt_entry_target *t; |
dcea992a | 355 | const struct xt_entry_match *ematch; |
71ae0dff | 356 | struct xt_counters *counter; |
a1ff4ac8 | 357 | |
1da177e4 | 358 | IP_NF_ASSERT(e); |
a1ff4ac8 | 359 | if (!ip_packet_match(ip, indev, outdev, |
de74c169 | 360 | &e->ip, acpar.fragoff)) { |
dcea992a | 361 | no_match: |
a1ff4ac8 JE |
362 | e = ipt_next_entry(e); |
363 | continue; | |
364 | } | |
1da177e4 | 365 | |
ef53d702 | 366 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
367 | acpar.match = ematch->u.kernel.match; |
368 | acpar.matchinfo = ematch->data; | |
369 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 370 | goto no_match; |
ef53d702 | 371 | } |
dcea992a | 372 | |
71ae0dff FW |
373 | counter = xt_get_this_cpu_counter(&e->counters); |
374 | ADD_COUNTER(*counter, skb->len, 1); | |
1da177e4 | 375 | |
a1ff4ac8 JE |
376 | t = ipt_get_target(e); |
377 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a | 378 | |
f0165888 | 379 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
380 | /* The packet is traced: log it */ |
381 | if (unlikely(skb->nf_trace)) | |
9dff2c96 EB |
382 | trace_packet(state->net, skb, hook, state->in, |
383 | state->out, table->name, private, e); | |
ba9dda3a | 384 | #endif |
a1ff4ac8 JE |
385 | /* Standard target? */ |
386 | if (!t->u.kernel.target->target) { | |
387 | int v; | |
388 | ||
87a2e70d | 389 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
390 | if (v < 0) { |
391 | /* Pop from stack? */ | |
243bf6e2 | 392 | if (v != XT_RETURN) { |
95c96174 | 393 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 394 | break; |
1da177e4 | 395 | } |
7814b6ec | 396 | if (stackidx == 0) { |
f3c5c1bf JE |
397 | e = get_entry(table_base, |
398 | private->underflow[hook]); | |
cecc74de | 399 | pr_debug("Underflow (this is normal) " |
f3c5c1bf JE |
400 | "to %p\n", e); |
401 | } else { | |
7814b6ec | 402 | e = jumpstack[--stackidx]; |
cecc74de | 403 | pr_debug("Pulled %p out from pos %u\n", |
7814b6ec | 404 | e, stackidx); |
f3c5c1bf JE |
405 | e = ipt_next_entry(e); |
406 | } | |
a1ff4ac8 JE |
407 | continue; |
408 | } | |
3666ed1c JP |
409 | if (table_base + v != ipt_next_entry(e) && |
410 | !(e->ip.flags & IPT_F_GOTO)) { | |
7814b6ec | 411 | jumpstack[stackidx++] = e; |
cecc74de | 412 | pr_debug("Pushed %p into pos %u\n", |
7814b6ec | 413 | e, stackidx - 1); |
a1ff4ac8 | 414 | } |
1da177e4 | 415 | |
a1ff4ac8 | 416 | e = get_entry(table_base, v); |
7a6b1c46 JE |
417 | continue; |
418 | } | |
419 | ||
de74c169 JE |
420 | acpar.target = t->u.kernel.target; |
421 | acpar.targinfo = t->data; | |
bb70dfa5 | 422 | |
de74c169 | 423 | verdict = t->u.kernel.target->target(skb, &acpar); |
7a6b1c46 JE |
424 | /* Target might have changed stuff. */ |
425 | ip = ip_hdr(skb); | |
243bf6e2 | 426 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
427 | e = ipt_next_entry(e); |
428 | else | |
429 | /* Verdict */ | |
430 | break; | |
b4ba2611 | 431 | } while (!acpar.hotdrop); |
7814b6ec FW |
432 | pr_debug("Exiting %s; sp at %u\n", __func__, stackidx); |
433 | ||
24cebe3f IM |
434 | xt_write_recseq_end(addend); |
435 | local_bh_enable(); | |
7f5c6d4f | 436 | |
1da177e4 LT |
437 | #ifdef DEBUG_ALLOW_ALL |
438 | return NF_ACCEPT; | |
439 | #else | |
b4ba2611 | 440 | if (acpar.hotdrop) |
1da177e4 LT |
441 | return NF_DROP; |
442 | else return verdict; | |
443 | #endif | |
444 | } | |
445 | ||
1da177e4 | 446 | /* Figures out from what hook each rule can be called: returns 0 if |
98dbbfc3 | 447 | there are loops. Puts hook bitmask in comefrom. */ |
1da177e4 | 448 | static int |
98dbbfc3 | 449 | mark_source_chains(const 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 (;;) { | |
87a2e70d | 467 | const struct xt_standard_target *t |
d5d1baa1 | 468 | = (void *)ipt_get_target_c(e); |
e1b4b9f3 | 469 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 470 | |
6e23ae2a | 471 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
654d0fbd | 472 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
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. */ | |
54d83fc7 | 479 | if ((unconditional(e) && |
3666ed1c | 480 | (strcmp(t->target.u.user.name, |
243bf6e2 | 481 | XT_STANDARD_TARGET) == 0) && |
54d83fc7 | 482 | t->verdict < 0) || visited) { |
1da177e4 LT |
483 | unsigned int oldpos, size; |
484 | ||
1f9352ae | 485 | if ((strcmp(t->target.u.user.name, |
24cebe3f | 486 | XT_STANDARD_TARGET) == 0) && |
1f9352ae | 487 | t->verdict < -NF_MAX_VERDICT - 1) { |
74c9c0c1 DM |
488 | duprintf("mark_source_chains: bad " |
489 | "negative verdict (%i)\n", | |
490 | t->verdict); | |
491 | return 0; | |
492 | } | |
493 | ||
1da177e4 LT |
494 | /* Return: backtrack through the last |
495 | big jump. */ | |
496 | do { | |
6e23ae2a | 497 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
498 | #ifdef DEBUG_IP_FIREWALL_USER |
499 | if (e->comefrom | |
6e23ae2a | 500 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
501 | duprintf("Back unset " |
502 | "on hook %u " | |
503 | "rule %u\n", | |
504 | hook, pos); | |
505 | } | |
506 | #endif | |
507 | oldpos = pos; | |
508 | pos = e->counters.pcnt; | |
509 | e->counters.pcnt = 0; | |
510 | ||
511 | /* We're at the start. */ | |
512 | if (pos == oldpos) | |
513 | goto next; | |
514 | ||
515 | e = (struct ipt_entry *) | |
31836064 | 516 | (entry0 + pos); |
1da177e4 LT |
517 | } while (oldpos == pos + e->next_offset); |
518 | ||
519 | /* Move along one */ | |
520 | size = e->next_offset; | |
521 | e = (struct ipt_entry *) | |
31836064 | 522 | (entry0 + pos + size); |
1da177e4 LT |
523 | e->counters.pcnt = pos; |
524 | pos += size; | |
525 | } else { | |
526 | int newpos = t->verdict; | |
527 | ||
528 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 529 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 530 | newpos >= 0) { |
74c9c0c1 DM |
531 | if (newpos > newinfo->size - |
532 | sizeof(struct ipt_entry)) { | |
533 | duprintf("mark_source_chains: " | |
534 | "bad verdict (%i)\n", | |
535 | newpos); | |
536 | return 0; | |
537 | } | |
1da177e4 | 538 | /* This a jump; chase it. */ |
98dbbfc3 FW |
539 | duprintf("Jump rule %u -> %u\n", |
540 | pos, newpos); | |
1da177e4 LT |
541 | } else { |
542 | /* ... this is a fallthru */ | |
543 | newpos = pos + e->next_offset; | |
544 | } | |
545 | e = (struct ipt_entry *) | |
31836064 | 546 | (entry0 + newpos); |
1da177e4 LT |
547 | e->counters.pcnt = pos; |
548 | pos = newpos; | |
549 | } | |
550 | } | |
19f0a602 | 551 | next: |
1da177e4 LT |
552 | duprintf("Finished chain %u\n", hook); |
553 | } | |
554 | return 1; | |
555 | } | |
556 | ||
87a2e70d | 557 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 558 | { |
6be3d859 JE |
559 | struct xt_mtdtor_param par; |
560 | ||
f54e9367 | 561 | par.net = net; |
6be3d859 JE |
562 | par.match = m->u.kernel.match; |
563 | par.matchinfo = m->data; | |
916a917d | 564 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
565 | if (par.match->destroy != NULL) |
566 | par.match->destroy(&par); | |
567 | module_put(par.match->me); | |
1da177e4 LT |
568 | } |
569 | ||
022748a9 | 570 | static int |
bdf533de | 571 | check_entry(const struct ipt_entry *e) |
a96be246 | 572 | { |
87a2e70d | 573 | const struct xt_entry_target *t; |
a96be246 | 574 | |
bdf533de | 575 | if (!ip_checkentry(&e->ip)) |
a96be246 | 576 | return -EINVAL; |
a96be246 | 577 | |
87a2e70d | 578 | if (e->target_offset + sizeof(struct xt_entry_target) > |
9c547959 | 579 | e->next_offset) |
a96be246 DM |
580 | return -EINVAL; |
581 | ||
d5d1baa1 | 582 | t = ipt_get_target_c(e); |
a96be246 DM |
583 | if (e->target_offset + t->u.target_size > e->next_offset) |
584 | return -EINVAL; | |
585 | ||
586 | return 0; | |
587 | } | |
588 | ||
022748a9 | 589 | static int |
87a2e70d | 590 | check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
a96be246 | 591 | { |
9b4fce7a | 592 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 DM |
593 | int ret; |
594 | ||
9b4fce7a JE |
595 | par->match = m->u.kernel.match; |
596 | par->matchinfo = m->data; | |
597 | ||
916a917d | 598 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 599 | ip->proto, ip->invflags & IPT_INV_PROTO); |
367c6790 | 600 | if (ret < 0) { |
b5cad0df | 601 | duprintf("check failed for `%s'.\n", par->match->name); |
367c6790 | 602 | return ret; |
a96be246 | 603 | } |
367c6790 | 604 | return 0; |
a96be246 DM |
605 | } |
606 | ||
022748a9 | 607 | static int |
87a2e70d | 608 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 609 | { |
6709dbbb | 610 | struct xt_match *match; |
3cdc7c95 | 611 | int ret; |
1da177e4 | 612 | |
fd0ec0e6 JE |
613 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
614 | m->u.user.revision); | |
615 | if (IS_ERR(match)) { | |
a96be246 | 616 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 617 | return PTR_ERR(match); |
1da177e4 LT |
618 | } |
619 | m->u.kernel.match = match; | |
620 | ||
6bdb331b | 621 | ret = check_match(m, par); |
3cdc7c95 PM |
622 | if (ret) |
623 | goto err; | |
624 | ||
1da177e4 | 625 | return 0; |
3cdc7c95 PM |
626 | err: |
627 | module_put(m->u.kernel.match->me); | |
628 | return ret; | |
1da177e4 LT |
629 | } |
630 | ||
add67461 | 631 | static int check_target(struct ipt_entry *e, struct net *net, const char *name) |
a96be246 | 632 | { |
87a2e70d | 633 | struct xt_entry_target *t = ipt_get_target(e); |
af5d6dc2 | 634 | struct xt_tgchk_param par = { |
add67461 | 635 | .net = net, |
af5d6dc2 JE |
636 | .table = name, |
637 | .entryinfo = e, | |
638 | .target = t->u.kernel.target, | |
639 | .targinfo = t->data, | |
640 | .hook_mask = e->comefrom, | |
916a917d | 641 | .family = NFPROTO_IPV4, |
af5d6dc2 | 642 | }; |
e905a9ed | 643 | int ret; |
a96be246 | 644 | |
916a917d | 645 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 646 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
367c6790 | 647 | if (ret < 0) { |
ff67e4e4 | 648 | duprintf("check failed for `%s'.\n", |
a96be246 | 649 | t->u.kernel.target->name); |
367c6790 | 650 | return ret; |
a96be246 | 651 | } |
367c6790 | 652 | return 0; |
a96be246 | 653 | } |
1da177e4 | 654 | |
022748a9 | 655 | static int |
a83d8e8d | 656 | find_check_entry(struct ipt_entry *e, struct net *net, const char *name, |
0559518b | 657 | unsigned int size) |
1da177e4 | 658 | { |
87a2e70d | 659 | struct xt_entry_target *t; |
6709dbbb | 660 | struct xt_target *target; |
1da177e4 LT |
661 | int ret; |
662 | unsigned int j; | |
9b4fce7a | 663 | struct xt_mtchk_param mtpar; |
dcea992a | 664 | struct xt_entry_match *ematch; |
1da177e4 | 665 | |
71ae0dff FW |
666 | e->counters.pcnt = xt_percpu_counter_alloc(); |
667 | if (IS_ERR_VALUE(e->counters.pcnt)) | |
668 | return -ENOMEM; | |
669 | ||
1da177e4 | 670 | j = 0; |
a83d8e8d | 671 | mtpar.net = net; |
9b4fce7a JE |
672 | mtpar.table = name; |
673 | mtpar.entryinfo = &e->ip; | |
674 | mtpar.hook_mask = e->comefrom; | |
916a917d | 675 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 676 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 677 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 678 | if (ret != 0) |
6bdb331b JE |
679 | goto cleanup_matches; |
680 | ++j; | |
dcea992a | 681 | } |
1da177e4 LT |
682 | |
683 | t = ipt_get_target(e); | |
d2a7b6ba JE |
684 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
685 | t->u.user.revision); | |
686 | if (IS_ERR(target)) { | |
a96be246 | 687 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 688 | ret = PTR_ERR(target); |
1da177e4 LT |
689 | goto cleanup_matches; |
690 | } | |
691 | t->u.kernel.target = target; | |
692 | ||
add67461 | 693 | ret = check_target(e, net, name); |
3cdc7c95 PM |
694 | if (ret) |
695 | goto err; | |
71ae0dff | 696 | |
1da177e4 | 697 | return 0; |
3cdc7c95 PM |
698 | err: |
699 | module_put(t->u.kernel.target->me); | |
1da177e4 | 700 | cleanup_matches: |
6bdb331b JE |
701 | xt_ematch_foreach(ematch, e) { |
702 | if (j-- == 0) | |
dcea992a | 703 | break; |
6bdb331b JE |
704 | cleanup_match(ematch, net); |
705 | } | |
71ae0dff FW |
706 | |
707 | xt_percpu_counter_free(e->counters.pcnt); | |
708 | ||
1da177e4 LT |
709 | return ret; |
710 | } | |
711 | ||
d5d1baa1 | 712 | static bool check_underflow(const struct ipt_entry *e) |
e2fe35c1 | 713 | { |
87a2e70d | 714 | const struct xt_entry_target *t; |
e2fe35c1 JE |
715 | unsigned int verdict; |
716 | ||
54d83fc7 | 717 | if (!unconditional(e)) |
e2fe35c1 | 718 | return false; |
d5d1baa1 | 719 | t = ipt_get_target_c(e); |
e2fe35c1 JE |
720 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
721 | return false; | |
87a2e70d | 722 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
723 | verdict = -verdict - 1; |
724 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
725 | } | |
726 | ||
022748a9 | 727 | static int |
1da177e4 | 728 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 729 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
730 | const unsigned char *base, |
731 | const unsigned char *limit, | |
1da177e4 LT |
732 | const unsigned int *hook_entries, |
733 | const unsigned int *underflows, | |
0559518b | 734 | unsigned int valid_hooks) |
1da177e4 LT |
735 | { |
736 | unsigned int h; | |
bdf533de | 737 | int err; |
1da177e4 | 738 | |
3666ed1c | 739 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 || |
6e94e0cf FW |
740 | (unsigned char *)e + sizeof(struct ipt_entry) >= limit || |
741 | (unsigned char *)e + e->next_offset > limit) { | |
1da177e4 LT |
742 | duprintf("Bad offset %p\n", e); |
743 | return -EINVAL; | |
744 | } | |
745 | ||
746 | if (e->next_offset | |
87a2e70d | 747 | < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target)) { |
1da177e4 LT |
748 | duprintf("checking: element %p size %u\n", |
749 | e, e->next_offset); | |
750 | return -EINVAL; | |
751 | } | |
752 | ||
bdf533de FW |
753 | err = check_entry(e); |
754 | if (err) | |
755 | return err; | |
756 | ||
1da177e4 | 757 | /* Check hooks & underflows */ |
6e23ae2a | 758 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
759 | if (!(valid_hooks & (1 << h))) |
760 | continue; | |
1da177e4 LT |
761 | if ((unsigned char *)e - base == hook_entries[h]) |
762 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 763 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 | 764 | if (!check_underflow(e)) { |
54d83fc7 FW |
765 | pr_debug("Underflows must be unconditional and " |
766 | "use the STANDARD target with " | |
767 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
768 | return -EINVAL; |
769 | } | |
1da177e4 | 770 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 771 | } |
1da177e4 LT |
772 | } |
773 | ||
1da177e4 | 774 | /* Clear counters and comefrom */ |
2e4e6a17 | 775 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 776 | e->comefrom = 0; |
1da177e4 LT |
777 | return 0; |
778 | } | |
779 | ||
0559518b JE |
780 | static void |
781 | cleanup_entry(struct ipt_entry *e, struct net *net) | |
1da177e4 | 782 | { |
a2df1648 | 783 | struct xt_tgdtor_param par; |
87a2e70d | 784 | struct xt_entry_target *t; |
dcea992a | 785 | struct xt_entry_match *ematch; |
1da177e4 | 786 | |
1da177e4 | 787 | /* Cleanup all matches */ |
dcea992a | 788 | xt_ematch_foreach(ematch, e) |
6bdb331b | 789 | cleanup_match(ematch, net); |
1da177e4 | 790 | t = ipt_get_target(e); |
a2df1648 | 791 | |
add67461 | 792 | par.net = net; |
a2df1648 JE |
793 | par.target = t->u.kernel.target; |
794 | par.targinfo = t->data; | |
916a917d | 795 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
796 | if (par.target->destroy != NULL) |
797 | par.target->destroy(&par); | |
798 | module_put(par.target->me); | |
71ae0dff | 799 | xt_percpu_counter_free(e->counters.pcnt); |
1da177e4 LT |
800 | } |
801 | ||
802 | /* Checks and translates the user-supplied table segment (held in | |
803 | newinfo) */ | |
804 | static int | |
0f234214 | 805 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
6c28255b | 806 | const struct ipt_replace *repl) |
1da177e4 | 807 | { |
72b2b1dd | 808 | struct ipt_entry *iter; |
1da177e4 | 809 | unsigned int i; |
72b2b1dd | 810 | int ret = 0; |
1da177e4 | 811 | |
0f234214 JE |
812 | newinfo->size = repl->size; |
813 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
814 | |
815 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 816 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
817 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
818 | newinfo->underflow[i] = 0xFFFFFFFF; | |
819 | } | |
820 | ||
821 | duprintf("translate_table: size %u\n", newinfo->size); | |
822 | i = 0; | |
823 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
824 | xt_entry_foreach(iter, entry0, newinfo->size) { |
825 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
826 | entry0 + repl->size, |
827 | repl->hook_entry, | |
828 | repl->underflow, | |
829 | repl->valid_hooks); | |
72b2b1dd | 830 | if (ret != 0) |
0559518b JE |
831 | return ret; |
832 | ++i; | |
98dbbfc3 FW |
833 | if (strcmp(ipt_get_target(iter)->u.user.name, |
834 | XT_ERROR_TARGET) == 0) | |
835 | ++newinfo->stacksize; | |
72b2b1dd | 836 | } |
1da177e4 | 837 | |
0f234214 | 838 | if (i != repl->num_entries) { |
1da177e4 | 839 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 840 | i, repl->num_entries); |
1da177e4 LT |
841 | return -EINVAL; |
842 | } | |
843 | ||
844 | /* Check hooks all assigned */ | |
6e23ae2a | 845 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 846 | /* Only hooks which are valid */ |
0f234214 | 847 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
848 | continue; |
849 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
850 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 851 | i, repl->hook_entry[i]); |
1da177e4 LT |
852 | return -EINVAL; |
853 | } | |
854 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
855 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 856 | i, repl->underflow[i]); |
1da177e4 LT |
857 | return -EINVAL; |
858 | } | |
859 | } | |
860 | ||
0f234214 | 861 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
862 | return -ELOOP; |
863 | ||
1da177e4 LT |
864 | /* Finally, each sanity check must pass */ |
865 | i = 0; | |
72b2b1dd | 866 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 867 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
868 | if (ret != 0) |
869 | break; | |
0559518b | 870 | ++i; |
72b2b1dd | 871 | } |
1da177e4 | 872 | |
74c9c0c1 | 873 | if (ret != 0) { |
0559518b JE |
874 | xt_entry_foreach(iter, entry0, newinfo->size) { |
875 | if (i-- == 0) | |
72b2b1dd | 876 | break; |
0559518b JE |
877 | cleanup_entry(iter, net); |
878 | } | |
74c9c0c1 DM |
879 | return ret; |
880 | } | |
1da177e4 | 881 | |
1da177e4 LT |
882 | return ret; |
883 | } | |
884 | ||
1da177e4 | 885 | static void |
2e4e6a17 HW |
886 | get_counters(const struct xt_table_info *t, |
887 | struct xt_counters counters[]) | |
1da177e4 | 888 | { |
72b2b1dd | 889 | struct ipt_entry *iter; |
1da177e4 LT |
890 | unsigned int cpu; |
891 | unsigned int i; | |
892 | ||
6f912042 | 893 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 894 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 895 | |
1da177e4 | 896 | i = 0; |
482cfc31 | 897 | xt_entry_foreach(iter, t->entries, t->size) { |
71ae0dff | 898 | struct xt_counters *tmp; |
83723d60 ED |
899 | u64 bcnt, pcnt; |
900 | unsigned int start; | |
901 | ||
71ae0dff | 902 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
83723d60 | 903 | do { |
7f5c6d4f | 904 | start = read_seqcount_begin(s); |
71ae0dff FW |
905 | bcnt = tmp->bcnt; |
906 | pcnt = tmp->pcnt; | |
7f5c6d4f | 907 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
908 | |
909 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
910 | ++i; /* macro does multi eval of i */ |
911 | } | |
1da177e4 | 912 | } |
78454473 SH |
913 | } |
914 | ||
d5d1baa1 | 915 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 916 | { |
2722971c | 917 | unsigned int countersize; |
2e4e6a17 | 918 | struct xt_counters *counters; |
d5d1baa1 | 919 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
920 | |
921 | /* We need atomic snapshot of counters: rest doesn't change | |
922 | (other than comefrom, which userspace doesn't care | |
923 | about). */ | |
2e4e6a17 | 924 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 925 | counters = vzalloc(countersize); |
1da177e4 LT |
926 | |
927 | if (counters == NULL) | |
942e4a2b | 928 | return ERR_PTR(-ENOMEM); |
78454473 | 929 | |
942e4a2b | 930 | get_counters(private, counters); |
1da177e4 | 931 | |
2722971c DM |
932 | return counters; |
933 | } | |
934 | ||
935 | static int | |
936 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 937 | const struct xt_table *table, |
2722971c DM |
938 | void __user *userptr) |
939 | { | |
940 | unsigned int off, num; | |
d5d1baa1 | 941 | const struct ipt_entry *e; |
2722971c | 942 | struct xt_counters *counters; |
5452e425 | 943 | const struct xt_table_info *private = table->private; |
2722971c | 944 | int ret = 0; |
711bdde6 | 945 | const void *loc_cpu_entry; |
2722971c DM |
946 | |
947 | counters = alloc_counters(table); | |
948 | if (IS_ERR(counters)) | |
949 | return PTR_ERR(counters); | |
950 | ||
482cfc31 | 951 | loc_cpu_entry = private->entries; |
31836064 | 952 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
953 | ret = -EFAULT; |
954 | goto free_counters; | |
955 | } | |
956 | ||
957 | /* FIXME: use iterator macros --RR */ | |
958 | /* ... then go back and fix counters and names */ | |
959 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
960 | unsigned int i; | |
87a2e70d JE |
961 | const struct xt_entry_match *m; |
962 | const struct xt_entry_target *t; | |
1da177e4 | 963 | |
31836064 | 964 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
965 | if (copy_to_user(userptr + off |
966 | + offsetof(struct ipt_entry, counters), | |
967 | &counters[num], | |
968 | sizeof(counters[num])) != 0) { | |
969 | ret = -EFAULT; | |
970 | goto free_counters; | |
971 | } | |
972 | ||
973 | for (i = sizeof(struct ipt_entry); | |
974 | i < e->target_offset; | |
975 | i += m->u.match_size) { | |
976 | m = (void *)e + i; | |
977 | ||
978 | if (copy_to_user(userptr + off + i | |
87a2e70d | 979 | + offsetof(struct xt_entry_match, |
1da177e4 LT |
980 | u.user.name), |
981 | m->u.kernel.match->name, | |
982 | strlen(m->u.kernel.match->name)+1) | |
983 | != 0) { | |
984 | ret = -EFAULT; | |
985 | goto free_counters; | |
986 | } | |
987 | } | |
988 | ||
d5d1baa1 | 989 | t = ipt_get_target_c(e); |
1da177e4 | 990 | if (copy_to_user(userptr + off + e->target_offset |
87a2e70d | 991 | + offsetof(struct xt_entry_target, |
1da177e4 LT |
992 | u.user.name), |
993 | t->u.kernel.target->name, | |
994 | strlen(t->u.kernel.target->name)+1) != 0) { | |
995 | ret = -EFAULT; | |
996 | goto free_counters; | |
997 | } | |
998 | } | |
999 | ||
1000 | free_counters: | |
1001 | vfree(counters); | |
1002 | return ret; | |
1003 | } | |
1004 | ||
2722971c | 1005 | #ifdef CONFIG_COMPAT |
739674fb | 1006 | static void compat_standard_from_user(void *dst, const void *src) |
2722971c | 1007 | { |
9fa492cd | 1008 | int v = *(compat_int_t *)src; |
2722971c | 1009 | |
9fa492cd | 1010 | if (v > 0) |
b386d9f5 | 1011 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1012 | memcpy(dst, &v, sizeof(v)); |
1013 | } | |
46c5ea3c | 1014 | |
739674fb | 1015 | static int compat_standard_to_user(void __user *dst, const void *src) |
2722971c | 1016 | { |
9fa492cd | 1017 | compat_int_t cv = *(int *)src; |
2722971c | 1018 | |
9fa492cd | 1019 | if (cv > 0) |
b386d9f5 | 1020 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1021 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1022 | } |
1023 | ||
d5d1baa1 | 1024 | static int compat_calc_entry(const struct ipt_entry *e, |
4b478248 | 1025 | const struct xt_table_info *info, |
d5d1baa1 | 1026 | const void *base, struct xt_table_info *newinfo) |
2722971c | 1027 | { |
dcea992a | 1028 | const struct xt_entry_match *ematch; |
87a2e70d | 1029 | const struct xt_entry_target *t; |
e5b5ef7d | 1030 | unsigned int entry_offset; |
2722971c DM |
1031 | int off, i, ret; |
1032 | ||
30c08c41 | 1033 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c | 1034 | entry_offset = (void *)e - base; |
dcea992a | 1035 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1036 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1037 | t = ipt_get_target_c(e); |
9fa492cd | 1038 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1039 | newinfo->size -= off; |
b386d9f5 | 1040 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1041 | if (ret) |
1042 | return ret; | |
1043 | ||
6e23ae2a | 1044 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1045 | if (info->hook_entry[i] && |
1046 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1047 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1048 | if (info->underflow[i] && |
1049 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1050 | newinfo->underflow[i] -= off; |
1051 | } | |
1052 | return 0; | |
1053 | } | |
1054 | ||
259d4e41 | 1055 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1056 | struct xt_table_info *newinfo) |
2722971c | 1057 | { |
72b2b1dd | 1058 | struct ipt_entry *iter; |
711bdde6 | 1059 | const void *loc_cpu_entry; |
0559518b | 1060 | int ret; |
2722971c DM |
1061 | |
1062 | if (!newinfo || !info) | |
1063 | return -EINVAL; | |
1064 | ||
482cfc31 | 1065 | /* we dont care about newinfo->entries */ |
259d4e41 ED |
1066 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
1067 | newinfo->initial_entries = 0; | |
482cfc31 | 1068 | loc_cpu_entry = info->entries; |
255d0dc3 | 1069 | xt_compat_init_offsets(AF_INET, info->number); |
72b2b1dd JE |
1070 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1071 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1072 | if (ret != 0) | |
0559518b | 1073 | return ret; |
72b2b1dd | 1074 | } |
0559518b | 1075 | return 0; |
2722971c DM |
1076 | } |
1077 | #endif | |
1078 | ||
d5d1baa1 | 1079 | static int get_info(struct net *net, void __user *user, |
6c28255b | 1080 | const int *len, int compat) |
2722971c | 1081 | { |
12b00c2c | 1082 | char name[XT_TABLE_MAXNAMELEN]; |
e60a13e0 | 1083 | struct xt_table *t; |
2722971c DM |
1084 | int ret; |
1085 | ||
1086 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1087 | duprintf("length %u != %zu\n", *len, |
1088 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1089 | return -EINVAL; |
1090 | } | |
1091 | ||
1092 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1093 | return -EFAULT; | |
1094 | ||
12b00c2c | 1095 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
2722971c DM |
1096 | #ifdef CONFIG_COMPAT |
1097 | if (compat) | |
1098 | xt_compat_lock(AF_INET); | |
1099 | #endif | |
34bd137b | 1100 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1101 | "iptable_%s", name); |
0cc8d8df | 1102 | if (!IS_ERR_OR_NULL(t)) { |
2722971c | 1103 | struct ipt_getinfo info; |
5452e425 | 1104 | const struct xt_table_info *private = t->private; |
2722971c | 1105 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1106 | struct xt_table_info tmp; |
1107 | ||
2722971c | 1108 | if (compat) { |
2722971c | 1109 | ret = compat_table_info(private, &tmp); |
b386d9f5 | 1110 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1111 | private = &tmp; |
2722971c DM |
1112 | } |
1113 | #endif | |
b5f15ac4 | 1114 | memset(&info, 0, sizeof(info)); |
2722971c DM |
1115 | info.valid_hooks = t->valid_hooks; |
1116 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1117 | sizeof(info.hook_entry)); |
2722971c | 1118 | memcpy(info.underflow, private->underflow, |
4b478248 | 1119 | sizeof(info.underflow)); |
2722971c DM |
1120 | info.num_entries = private->number; |
1121 | info.size = private->size; | |
1122 | strcpy(info.name, name); | |
1123 | ||
1124 | if (copy_to_user(user, &info, *len) != 0) | |
1125 | ret = -EFAULT; | |
1126 | else | |
1127 | ret = 0; | |
1128 | ||
1129 | xt_table_unlock(t); | |
1130 | module_put(t->me); | |
1131 | } else | |
1132 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1133 | #ifdef CONFIG_COMPAT | |
1134 | if (compat) | |
1135 | xt_compat_unlock(AF_INET); | |
1136 | #endif | |
1137 | return ret; | |
1138 | } | |
1139 | ||
1140 | static int | |
d5d1baa1 JE |
1141 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
1142 | const int *len) | |
2722971c DM |
1143 | { |
1144 | int ret; | |
1145 | struct ipt_get_entries get; | |
e60a13e0 | 1146 | struct xt_table *t; |
2722971c DM |
1147 | |
1148 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1149 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1150 | return -EINVAL; |
1151 | } | |
1152 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1153 | return -EFAULT; | |
1154 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1155 | duprintf("get_entries: %u != %zu\n", |
1156 | *len, sizeof(get) + get.size); | |
2722971c DM |
1157 | return -EINVAL; |
1158 | } | |
b301f253 | 1159 | get.name[sizeof(get.name) - 1] = '\0'; |
2722971c | 1160 | |
34bd137b | 1161 | t = xt_find_table_lock(net, AF_INET, get.name); |
0cc8d8df | 1162 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1163 | const struct xt_table_info *private = t->private; |
9c547959 | 1164 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1165 | if (get.size == private->size) |
1166 | ret = copy_entries_to_user(private->size, | |
1167 | t, uptr->entrytable); | |
1168 | else { | |
1169 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1170 | private->size, get.size); |
544473c1 | 1171 | ret = -EAGAIN; |
2722971c DM |
1172 | } |
1173 | module_put(t->me); | |
1174 | xt_table_unlock(t); | |
1175 | } else | |
1176 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1177 | ||
1178 | return ret; | |
1179 | } | |
1180 | ||
1181 | static int | |
34bd137b | 1182 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1183 | struct xt_table_info *newinfo, unsigned int num_counters, |
1184 | void __user *counters_ptr) | |
2722971c DM |
1185 | { |
1186 | int ret; | |
e60a13e0 | 1187 | struct xt_table *t; |
2722971c DM |
1188 | struct xt_table_info *oldinfo; |
1189 | struct xt_counters *counters; | |
72b2b1dd | 1190 | struct ipt_entry *iter; |
2722971c DM |
1191 | |
1192 | ret = 0; | |
83723d60 | 1193 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
2722971c DM |
1194 | if (!counters) { |
1195 | ret = -ENOMEM; | |
1196 | goto out; | |
1197 | } | |
1198 | ||
34bd137b | 1199 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c | 1200 | "iptable_%s", name); |
0cc8d8df | 1201 | if (IS_ERR_OR_NULL(t)) { |
2722971c DM |
1202 | ret = t ? PTR_ERR(t) : -ENOENT; |
1203 | goto free_newinfo_counters_untrans; | |
1204 | } | |
1205 | ||
1206 | /* You lied! */ | |
1207 | if (valid_hooks != t->valid_hooks) { | |
1208 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1209 | valid_hooks, t->valid_hooks); | |
1210 | ret = -EINVAL; | |
1211 | goto put_module; | |
1212 | } | |
1213 | ||
1214 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1215 | if (!oldinfo) | |
1216 | goto put_module; | |
1217 | ||
1218 | /* Update module usage count based on number of rules */ | |
1219 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1220 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1221 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1222 | (newinfo->number <= oldinfo->initial_entries)) | |
1223 | module_put(t->me); | |
1224 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1225 | (newinfo->number <= oldinfo->initial_entries)) | |
1226 | module_put(t->me); | |
1227 | ||
942e4a2b | 1228 | /* Get the old counters, and synchronize with replace */ |
2722971c | 1229 | get_counters(oldinfo, counters); |
942e4a2b | 1230 | |
2722971c | 1231 | /* Decrease module usage counts and free resource */ |
482cfc31 | 1232 | xt_entry_foreach(iter, oldinfo->entries, oldinfo->size) |
0559518b | 1233 | cleanup_entry(iter, net); |
72b2b1dd | 1234 | |
2722971c DM |
1235 | xt_free_table_info(oldinfo); |
1236 | if (copy_to_user(counters_ptr, counters, | |
c58dd2dd TG |
1237 | sizeof(struct xt_counters) * num_counters) != 0) { |
1238 | /* Silent error, can't fail, new table is already in place */ | |
1239 | net_warn_ratelimited("iptables: counters copy to user failed while replacing table\n"); | |
1240 | } | |
2722971c DM |
1241 | vfree(counters); |
1242 | xt_table_unlock(t); | |
1243 | return ret; | |
1244 | ||
1245 | put_module: | |
1246 | module_put(t->me); | |
1247 | xt_table_unlock(t); | |
1248 | free_newinfo_counters_untrans: | |
1249 | vfree(counters); | |
1250 | out: | |
1251 | return ret; | |
1252 | } | |
1253 | ||
1254 | static int | |
d5d1baa1 | 1255 | do_replace(struct net *net, const void __user *user, unsigned int len) |
2722971c DM |
1256 | { |
1257 | int ret; | |
1258 | struct ipt_replace tmp; | |
1259 | struct xt_table_info *newinfo; | |
1260 | void *loc_cpu_entry; | |
72b2b1dd | 1261 | struct ipt_entry *iter; |
2722971c DM |
1262 | |
1263 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1264 | return -EFAULT; | |
1265 | ||
2722971c | 1266 | /* overflow check */ |
2722971c DM |
1267 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1268 | return -ENOMEM; | |
1086bbe9 DJ |
1269 | if (tmp.num_counters == 0) |
1270 | return -EINVAL; | |
1271 | ||
78b79876 | 1272 | tmp.name[sizeof(tmp.name)-1] = 0; |
2722971c DM |
1273 | |
1274 | newinfo = xt_alloc_table_info(tmp.size); | |
1275 | if (!newinfo) | |
1276 | return -ENOMEM; | |
1277 | ||
482cfc31 | 1278 | loc_cpu_entry = newinfo->entries; |
2722971c DM |
1279 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1280 | tmp.size) != 0) { | |
1281 | ret = -EFAULT; | |
1282 | goto free_newinfo; | |
1283 | } | |
1284 | ||
0f234214 | 1285 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
2722971c DM |
1286 | if (ret != 0) |
1287 | goto free_newinfo; | |
1288 | ||
ff67e4e4 | 1289 | duprintf("Translated table\n"); |
2722971c | 1290 | |
34bd137b | 1291 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1292 | tmp.num_counters, tmp.counters); |
2722971c DM |
1293 | if (ret) |
1294 | goto free_newinfo_untrans; | |
1295 | return 0; | |
1296 | ||
1297 | free_newinfo_untrans: | |
72b2b1dd | 1298 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1299 | cleanup_entry(iter, net); |
2722971c DM |
1300 | free_newinfo: |
1301 | xt_free_table_info(newinfo); | |
1302 | return ret; | |
1303 | } | |
1304 | ||
2722971c | 1305 | static int |
d5d1baa1 | 1306 | do_add_counters(struct net *net, const void __user *user, |
6c28255b | 1307 | unsigned int len, int compat) |
2722971c | 1308 | { |
482cfc31 | 1309 | unsigned int i; |
2722971c DM |
1310 | struct xt_counters_info tmp; |
1311 | struct xt_counters *paddc; | |
1312 | unsigned int num_counters; | |
5452e425 | 1313 | const char *name; |
2722971c DM |
1314 | int size; |
1315 | void *ptmp; | |
e60a13e0 | 1316 | struct xt_table *t; |
5452e425 | 1317 | const struct xt_table_info *private; |
2722971c | 1318 | int ret = 0; |
72b2b1dd | 1319 | struct ipt_entry *iter; |
7f5c6d4f | 1320 | unsigned int addend; |
2722971c DM |
1321 | #ifdef CONFIG_COMPAT |
1322 | struct compat_xt_counters_info compat_tmp; | |
1323 | ||
1324 | if (compat) { | |
1325 | ptmp = &compat_tmp; | |
1326 | size = sizeof(struct compat_xt_counters_info); | |
1327 | } else | |
1328 | #endif | |
1329 | { | |
1330 | ptmp = &tmp; | |
1331 | size = sizeof(struct xt_counters_info); | |
1332 | } | |
1333 | ||
1334 | if (copy_from_user(ptmp, user, size) != 0) | |
1335 | return -EFAULT; | |
1336 | ||
1337 | #ifdef CONFIG_COMPAT | |
1338 | if (compat) { | |
1339 | num_counters = compat_tmp.num_counters; | |
1340 | name = compat_tmp.name; | |
1341 | } else | |
1342 | #endif | |
1343 | { | |
1344 | num_counters = tmp.num_counters; | |
1345 | name = tmp.name; | |
1346 | } | |
1347 | ||
1348 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1349 | return -EINVAL; | |
1350 | ||
e12f8e29 | 1351 | paddc = vmalloc(len - size); |
2722971c DM |
1352 | if (!paddc) |
1353 | return -ENOMEM; | |
1354 | ||
1355 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1356 | ret = -EFAULT; | |
1357 | goto free; | |
1358 | } | |
1359 | ||
34bd137b | 1360 | t = xt_find_table_lock(net, AF_INET, name); |
0cc8d8df | 1361 | if (IS_ERR_OR_NULL(t)) { |
2722971c DM |
1362 | ret = t ? PTR_ERR(t) : -ENOENT; |
1363 | goto free; | |
1364 | } | |
1365 | ||
942e4a2b | 1366 | local_bh_disable(); |
2722971c DM |
1367 | private = t->private; |
1368 | if (private->number != num_counters) { | |
1369 | ret = -EINVAL; | |
1370 | goto unlock_up_free; | |
1371 | } | |
1372 | ||
1373 | i = 0; | |
7f5c6d4f | 1374 | addend = xt_write_recseq_begin(); |
482cfc31 | 1375 | xt_entry_foreach(iter, private->entries, private->size) { |
71ae0dff FW |
1376 | struct xt_counters *tmp; |
1377 | ||
1378 | tmp = xt_get_this_cpu_counter(&iter->counters); | |
1379 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); | |
0559518b JE |
1380 | ++i; |
1381 | } | |
7f5c6d4f | 1382 | xt_write_recseq_end(addend); |
2722971c | 1383 | unlock_up_free: |
942e4a2b | 1384 | local_bh_enable(); |
2722971c DM |
1385 | xt_table_unlock(t); |
1386 | module_put(t->me); | |
1387 | free: | |
1388 | vfree(paddc); | |
1389 | ||
1390 | return ret; | |
1391 | } | |
1392 | ||
1393 | #ifdef CONFIG_COMPAT | |
1394 | struct compat_ipt_replace { | |
12b00c2c | 1395 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1396 | u32 valid_hooks; |
1397 | u32 num_entries; | |
1398 | u32 size; | |
6e23ae2a PM |
1399 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1400 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c | 1401 | u32 num_counters; |
87a2e70d | 1402 | compat_uptr_t counters; /* struct xt_counters * */ |
2722971c DM |
1403 | struct compat_ipt_entry entries[0]; |
1404 | }; | |
1405 | ||
a18aa31b PM |
1406 | static int |
1407 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1408 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1409 | unsigned int i) |
2722971c | 1410 | { |
87a2e70d | 1411 | struct xt_entry_target *t; |
2722971c DM |
1412 | struct compat_ipt_entry __user *ce; |
1413 | u_int16_t target_offset, next_offset; | |
1414 | compat_uint_t origsize; | |
dcea992a JE |
1415 | const struct xt_entry_match *ematch; |
1416 | int ret = 0; | |
2722971c | 1417 | |
2722971c DM |
1418 | origsize = *size; |
1419 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
0559518b JE |
1420 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
1421 | copy_to_user(&ce->counters, &counters[i], | |
1422 | sizeof(counters[i])) != 0) | |
1423 | return -EFAULT; | |
a18aa31b | 1424 | |
2722971c | 1425 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1426 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1427 | ||
dcea992a JE |
1428 | xt_ematch_foreach(ematch, e) { |
1429 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1430 | if (ret != 0) | |
6bdb331b | 1431 | return ret; |
dcea992a | 1432 | } |
2722971c | 1433 | target_offset = e->target_offset - (origsize - *size); |
2722971c | 1434 | t = ipt_get_target(e); |
9fa492cd | 1435 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c | 1436 | if (ret) |
0559518b | 1437 | return ret; |
2722971c | 1438 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1439 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1440 | put_user(next_offset, &ce->next_offset) != 0) | |
1441 | return -EFAULT; | |
2722971c | 1442 | return 0; |
2722971c DM |
1443 | } |
1444 | ||
022748a9 | 1445 | static int |
87a2e70d | 1446 | compat_find_calc_match(struct xt_entry_match *m, |
4b478248 PM |
1447 | const char *name, |
1448 | const struct ipt_ip *ip, | |
6bdb331b | 1449 | int *size) |
2722971c | 1450 | { |
6709dbbb | 1451 | struct xt_match *match; |
2722971c | 1452 | |
fd0ec0e6 JE |
1453 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
1454 | m->u.user.revision); | |
1455 | if (IS_ERR(match)) { | |
2722971c | 1456 | duprintf("compat_check_calc_match: `%s' not found\n", |
4b478248 | 1457 | m->u.user.name); |
fd0ec0e6 | 1458 | return PTR_ERR(match); |
2722971c DM |
1459 | } |
1460 | m->u.kernel.match = match; | |
9fa492cd | 1461 | *size += xt_compat_match_offset(match); |
4c1b52bc DM |
1462 | return 0; |
1463 | } | |
1464 | ||
0559518b | 1465 | static void compat_release_entry(struct compat_ipt_entry *e) |
4c1b52bc | 1466 | { |
87a2e70d | 1467 | struct xt_entry_target *t; |
dcea992a | 1468 | struct xt_entry_match *ematch; |
4c1b52bc | 1469 | |
4c1b52bc | 1470 | /* Cleanup all matches */ |
dcea992a | 1471 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1472 | module_put(ematch->u.kernel.match->me); |
73cd598d | 1473 | t = compat_ipt_get_target(e); |
4c1b52bc | 1474 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1475 | } |
1476 | ||
022748a9 | 1477 | static int |
73cd598d | 1478 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1479 | struct xt_table_info *newinfo, |
1480 | unsigned int *size, | |
d5d1baa1 JE |
1481 | const unsigned char *base, |
1482 | const unsigned char *limit, | |
1483 | const unsigned int *hook_entries, | |
1484 | const unsigned int *underflows, | |
4b478248 | 1485 | const char *name) |
2722971c | 1486 | { |
dcea992a | 1487 | struct xt_entry_match *ematch; |
87a2e70d | 1488 | struct xt_entry_target *t; |
6709dbbb | 1489 | struct xt_target *target; |
e5b5ef7d | 1490 | unsigned int entry_offset; |
b0a6363c PM |
1491 | unsigned int j; |
1492 | int ret, off, h; | |
2722971c DM |
1493 | |
1494 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c | 1495 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
6e94e0cf FW |
1496 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit || |
1497 | (unsigned char *)e + e->next_offset > limit) { | |
2722971c DM |
1498 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1499 | return -EINVAL; | |
1500 | } | |
1501 | ||
1502 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1503 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1504 | duprintf("checking: element %p size %u\n", |
1505 | e, e->next_offset); | |
1506 | return -EINVAL; | |
1507 | } | |
1508 | ||
73cd598d | 1509 | /* For purposes of check_entry casting the compat entry is fine */ |
bdf533de | 1510 | ret = check_entry((struct ipt_entry *)e); |
a96be246 DM |
1511 | if (ret) |
1512 | return ret; | |
590bdf7f | 1513 | |
30c08c41 | 1514 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1515 | entry_offset = (void *)e - (void *)base; |
1516 | j = 0; | |
dcea992a | 1517 | xt_ematch_foreach(ematch, e) { |
2f06550b | 1518 | ret = compat_find_calc_match(ematch, name, &e->ip, &off); |
dcea992a | 1519 | if (ret != 0) |
6bdb331b JE |
1520 | goto release_matches; |
1521 | ++j; | |
dcea992a | 1522 | } |
2722971c | 1523 | |
73cd598d | 1524 | t = compat_ipt_get_target(e); |
d2a7b6ba JE |
1525 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
1526 | t->u.user.revision); | |
1527 | if (IS_ERR(target)) { | |
a96be246 | 1528 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1529 | t->u.user.name); |
d2a7b6ba | 1530 | ret = PTR_ERR(target); |
4c1b52bc | 1531 | goto release_matches; |
2722971c DM |
1532 | } |
1533 | t->u.kernel.target = target; | |
1534 | ||
9fa492cd | 1535 | off += xt_compat_target_offset(target); |
2722971c | 1536 | *size += off; |
b386d9f5 | 1537 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1538 | if (ret) |
1539 | goto out; | |
1540 | ||
1541 | /* Check hooks & underflows */ | |
6e23ae2a | 1542 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1543 | if ((unsigned char *)e - base == hook_entries[h]) |
1544 | newinfo->hook_entry[h] = hook_entries[h]; | |
1545 | if ((unsigned char *)e - base == underflows[h]) | |
1546 | newinfo->underflow[h] = underflows[h]; | |
1547 | } | |
1548 | ||
1549 | /* Clear counters and comefrom */ | |
73cd598d | 1550 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c | 1551 | e->comefrom = 0; |
2722971c | 1552 | return 0; |
bec71b16 | 1553 | |
2722971c | 1554 | out: |
bec71b16 | 1555 | module_put(t->u.kernel.target->me); |
4c1b52bc | 1556 | release_matches: |
6bdb331b JE |
1557 | xt_ematch_foreach(ematch, e) { |
1558 | if (j-- == 0) | |
dcea992a | 1559 | break; |
6bdb331b JE |
1560 | module_put(ematch->u.kernel.match->me); |
1561 | } | |
2722971c DM |
1562 | return ret; |
1563 | } | |
1564 | ||
4b478248 | 1565 | static int |
73cd598d | 1566 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1567 | unsigned int *size, const char *name, |
1568 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c | 1569 | { |
87a2e70d | 1570 | struct xt_entry_target *t; |
6709dbbb | 1571 | struct xt_target *target; |
2722971c DM |
1572 | struct ipt_entry *de; |
1573 | unsigned int origsize; | |
920b868a | 1574 | int ret, h; |
dcea992a | 1575 | struct xt_entry_match *ematch; |
2722971c DM |
1576 | |
1577 | ret = 0; | |
1578 | origsize = *size; | |
1579 | de = (struct ipt_entry *)*dstptr; | |
1580 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1581 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1582 | |
73cd598d | 1583 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1584 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1585 | ||
dcea992a JE |
1586 | xt_ematch_foreach(ematch, e) { |
1587 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1588 | if (ret != 0) | |
6bdb331b | 1589 | return ret; |
dcea992a | 1590 | } |
2722971c | 1591 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1592 | t = compat_ipt_get_target(e); |
2722971c | 1593 | target = t->u.kernel.target; |
9fa492cd | 1594 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1595 | |
1596 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1597 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1598 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1599 | newinfo->hook_entry[h] -= origsize - *size; | |
1600 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1601 | newinfo->underflow[h] -= origsize - *size; | |
1602 | } | |
f6677f43 DM |
1603 | return ret; |
1604 | } | |
1605 | ||
022748a9 | 1606 | static int |
0559518b | 1607 | compat_check_entry(struct ipt_entry *e, struct net *net, const char *name) |
f6677f43 | 1608 | { |
dcea992a | 1609 | struct xt_entry_match *ematch; |
9b4fce7a | 1610 | struct xt_mtchk_param mtpar; |
b0a6363c | 1611 | unsigned int j; |
dcea992a | 1612 | int ret = 0; |
f6677f43 | 1613 | |
71ae0dff FW |
1614 | e->counters.pcnt = xt_percpu_counter_alloc(); |
1615 | if (IS_ERR_VALUE(e->counters.pcnt)) | |
1616 | return -ENOMEM; | |
1617 | ||
4c1b52bc | 1618 | j = 0; |
a83d8e8d | 1619 | mtpar.net = net; |
9b4fce7a JE |
1620 | mtpar.table = name; |
1621 | mtpar.entryinfo = &e->ip; | |
1622 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1623 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 1624 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1625 | ret = check_match(ematch, &mtpar); |
dcea992a | 1626 | if (ret != 0) |
6bdb331b JE |
1627 | goto cleanup_matches; |
1628 | ++j; | |
dcea992a | 1629 | } |
4c1b52bc | 1630 | |
add67461 | 1631 | ret = check_target(e, net, name); |
4c1b52bc DM |
1632 | if (ret) |
1633 | goto cleanup_matches; | |
4c1b52bc DM |
1634 | return 0; |
1635 | ||
1636 | cleanup_matches: | |
6bdb331b JE |
1637 | xt_ematch_foreach(ematch, e) { |
1638 | if (j-- == 0) | |
dcea992a | 1639 | break; |
6bdb331b JE |
1640 | cleanup_match(ematch, net); |
1641 | } | |
71ae0dff FW |
1642 | |
1643 | xt_percpu_counter_free(e->counters.pcnt); | |
1644 | ||
4c1b52bc | 1645 | return ret; |
f6677f43 DM |
1646 | } |
1647 | ||
1da177e4 | 1648 | static int |
a83d8e8d AD |
1649 | translate_compat_table(struct net *net, |
1650 | const char *name, | |
4b478248 PM |
1651 | unsigned int valid_hooks, |
1652 | struct xt_table_info **pinfo, | |
1653 | void **pentry0, | |
1654 | unsigned int total_size, | |
1655 | unsigned int number, | |
1656 | unsigned int *hook_entries, | |
1657 | unsigned int *underflows) | |
1da177e4 | 1658 | { |
920b868a | 1659 | unsigned int i, j; |
2722971c DM |
1660 | struct xt_table_info *newinfo, *info; |
1661 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1662 | struct compat_ipt_entry *iter0; |
1663 | struct ipt_entry *iter1; | |
2722971c | 1664 | unsigned int size; |
0559518b | 1665 | int ret; |
1da177e4 | 1666 | |
2722971c DM |
1667 | info = *pinfo; |
1668 | entry0 = *pentry0; | |
1669 | size = total_size; | |
1670 | info->number = number; | |
1671 | ||
1672 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1673 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1674 | info->hook_entry[i] = 0xFFFFFFFF; |
1675 | info->underflow[i] = 0xFFFFFFFF; | |
1676 | } | |
1677 | ||
1678 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1679 | j = 0; |
2722971c | 1680 | xt_compat_lock(AF_INET); |
255d0dc3 | 1681 | xt_compat_init_offsets(AF_INET, number); |
2722971c | 1682 | /* Walk through entries, checking offsets. */ |
72b2b1dd JE |
1683 | xt_entry_foreach(iter0, entry0, total_size) { |
1684 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1685 | entry0, |
1686 | entry0 + total_size, | |
1687 | hook_entries, | |
1688 | underflows, | |
1689 | name); | |
72b2b1dd | 1690 | if (ret != 0) |
0559518b JE |
1691 | goto out_unlock; |
1692 | ++j; | |
72b2b1dd | 1693 | } |
2722971c DM |
1694 | |
1695 | ret = -EINVAL; | |
920b868a | 1696 | if (j != number) { |
2722971c | 1697 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1698 | j, number); |
2722971c DM |
1699 | goto out_unlock; |
1700 | } | |
1701 | ||
1702 | /* Check hooks all assigned */ | |
6e23ae2a | 1703 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1704 | /* Only hooks which are valid */ |
1705 | if (!(valid_hooks & (1 << i))) | |
1706 | continue; | |
1707 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1708 | duprintf("Invalid hook entry %u %u\n", | |
1709 | i, hook_entries[i]); | |
1710 | goto out_unlock; | |
1da177e4 | 1711 | } |
2722971c DM |
1712 | if (info->underflow[i] == 0xFFFFFFFF) { |
1713 | duprintf("Invalid underflow %u %u\n", | |
1714 | i, underflows[i]); | |
1715 | goto out_unlock; | |
1716 | } | |
1717 | } | |
1718 | ||
1719 | ret = -ENOMEM; | |
1720 | newinfo = xt_alloc_table_info(size); | |
1721 | if (!newinfo) | |
1722 | goto out_unlock; | |
1723 | ||
1724 | newinfo->number = number; | |
6e23ae2a | 1725 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1726 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1727 | newinfo->underflow[i] = info->underflow[i]; | |
1728 | } | |
482cfc31 | 1729 | entry1 = newinfo->entries; |
2722971c | 1730 | pos = entry1; |
4b478248 | 1731 | size = total_size; |
72b2b1dd | 1732 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1733 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1734 | name, newinfo, entry1); | |
72b2b1dd JE |
1735 | if (ret != 0) |
1736 | break; | |
1737 | } | |
b386d9f5 | 1738 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1739 | xt_compat_unlock(AF_INET); |
1740 | if (ret) | |
1741 | goto free_newinfo; | |
1742 | ||
1743 | ret = -ELOOP; | |
1744 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1745 | goto free_newinfo; | |
1746 | ||
4c1b52bc | 1747 | i = 0; |
72b2b1dd | 1748 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1749 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1750 | if (ret != 0) |
1751 | break; | |
0559518b | 1752 | ++i; |
98dbbfc3 FW |
1753 | if (strcmp(ipt_get_target(iter1)->u.user.name, |
1754 | XT_ERROR_TARGET) == 0) | |
1755 | ++newinfo->stacksize; | |
72b2b1dd | 1756 | } |
4c1b52bc | 1757 | if (ret) { |
72b2b1dd JE |
1758 | /* |
1759 | * The first i matches need cleanup_entry (calls ->destroy) | |
1760 | * because they had called ->check already. The other j-i | |
1761 | * entries need only release. | |
1762 | */ | |
1763 | int skip = i; | |
4c1b52bc | 1764 | j -= i; |
72b2b1dd JE |
1765 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1766 | if (skip-- > 0) | |
1767 | continue; | |
0559518b | 1768 | if (j-- == 0) |
72b2b1dd | 1769 | break; |
0559518b | 1770 | compat_release_entry(iter0); |
72b2b1dd | 1771 | } |
0559518b JE |
1772 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1773 | if (i-- == 0) | |
72b2b1dd | 1774 | break; |
0559518b JE |
1775 | cleanup_entry(iter1, net); |
1776 | } | |
4c1b52bc DM |
1777 | xt_free_table_info(newinfo); |
1778 | return ret; | |
1779 | } | |
f6677f43 | 1780 | |
2722971c DM |
1781 | *pinfo = newinfo; |
1782 | *pentry0 = entry1; | |
1783 | xt_free_table_info(info); | |
1784 | return 0; | |
1da177e4 | 1785 | |
2722971c DM |
1786 | free_newinfo: |
1787 | xt_free_table_info(newinfo); | |
1788 | out: | |
0559518b JE |
1789 | xt_entry_foreach(iter0, entry0, total_size) { |
1790 | if (j-- == 0) | |
72b2b1dd | 1791 | break; |
0559518b JE |
1792 | compat_release_entry(iter0); |
1793 | } | |
1da177e4 | 1794 | return ret; |
2722971c | 1795 | out_unlock: |
b386d9f5 | 1796 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1797 | xt_compat_unlock(AF_INET); |
1798 | goto out; | |
1da177e4 LT |
1799 | } |
1800 | ||
1801 | static int | |
34bd137b | 1802 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1803 | { |
1804 | int ret; | |
2722971c DM |
1805 | struct compat_ipt_replace tmp; |
1806 | struct xt_table_info *newinfo; | |
1807 | void *loc_cpu_entry; | |
72b2b1dd | 1808 | struct ipt_entry *iter; |
1da177e4 LT |
1809 | |
1810 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1811 | return -EFAULT; | |
1812 | ||
ee4bb818 | 1813 | /* overflow check */ |
259d4e41 | 1814 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1815 | return -ENOMEM; |
1816 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1817 | return -ENOMEM; | |
1086bbe9 DJ |
1818 | if (tmp.num_counters == 0) |
1819 | return -EINVAL; | |
1820 | ||
78b79876 | 1821 | tmp.name[sizeof(tmp.name)-1] = 0; |
ee4bb818 | 1822 | |
2e4e6a17 | 1823 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1824 | if (!newinfo) |
1825 | return -ENOMEM; | |
1826 | ||
482cfc31 | 1827 | loc_cpu_entry = newinfo->entries; |
31836064 | 1828 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1da177e4 LT |
1829 | tmp.size) != 0) { |
1830 | ret = -EFAULT; | |
1831 | goto free_newinfo; | |
1832 | } | |
1833 | ||
a83d8e8d | 1834 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
4b478248 PM |
1835 | &newinfo, &loc_cpu_entry, tmp.size, |
1836 | tmp.num_entries, tmp.hook_entry, | |
1837 | tmp.underflow); | |
2722971c | 1838 | if (ret != 0) |
1da177e4 | 1839 | goto free_newinfo; |
1da177e4 | 1840 | |
2722971c | 1841 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1842 | |
34bd137b | 1843 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1844 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1845 | if (ret) |
1846 | goto free_newinfo_untrans; | |
1847 | return 0; | |
1da177e4 | 1848 | |
2722971c | 1849 | free_newinfo_untrans: |
72b2b1dd | 1850 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1851 | cleanup_entry(iter, net); |
2722971c DM |
1852 | free_newinfo: |
1853 | xt_free_table_info(newinfo); | |
1854 | return ret; | |
1855 | } | |
1da177e4 | 1856 | |
2722971c DM |
1857 | static int |
1858 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1859 | unsigned int len) |
2722971c DM |
1860 | { |
1861 | int ret; | |
1da177e4 | 1862 | |
52e804c6 | 1863 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
2722971c | 1864 | return -EPERM; |
1da177e4 | 1865 | |
2722971c DM |
1866 | switch (cmd) { |
1867 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1868 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1869 | break; |
1da177e4 | 1870 | |
2722971c | 1871 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1872 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1873 | break; |
1874 | ||
1875 | default: | |
1876 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1877 | ret = -EINVAL; | |
1878 | } | |
1da177e4 | 1879 | |
1da177e4 LT |
1880 | return ret; |
1881 | } | |
1882 | ||
4b478248 | 1883 | struct compat_ipt_get_entries { |
12b00c2c | 1884 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1885 | compat_uint_t size; |
1886 | struct compat_ipt_entry entrytable[0]; | |
1887 | }; | |
1da177e4 | 1888 | |
4b478248 PM |
1889 | static int |
1890 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1891 | void __user *userptr) | |
2722971c | 1892 | { |
2722971c | 1893 | struct xt_counters *counters; |
5452e425 | 1894 | const struct xt_table_info *private = table->private; |
2722971c DM |
1895 | void __user *pos; |
1896 | unsigned int size; | |
1897 | int ret = 0; | |
a18aa31b | 1898 | unsigned int i = 0; |
72b2b1dd | 1899 | struct ipt_entry *iter; |
1da177e4 | 1900 | |
2722971c DM |
1901 | counters = alloc_counters(table); |
1902 | if (IS_ERR(counters)) | |
1903 | return PTR_ERR(counters); | |
1904 | ||
2722971c DM |
1905 | pos = userptr; |
1906 | size = total_size; | |
482cfc31 | 1907 | xt_entry_foreach(iter, private->entries, total_size) { |
72b2b1dd | 1908 | ret = compat_copy_entry_to_user(iter, &pos, |
6b4ff2d7 | 1909 | &size, counters, i++); |
72b2b1dd JE |
1910 | if (ret != 0) |
1911 | break; | |
1912 | } | |
2722971c | 1913 | |
2722971c DM |
1914 | vfree(counters); |
1915 | return ret; | |
1da177e4 LT |
1916 | } |
1917 | ||
1918 | static int | |
34bd137b AD |
1919 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1920 | int *len) | |
1da177e4 | 1921 | { |
2722971c DM |
1922 | int ret; |
1923 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1924 | struct xt_table *t; |
1da177e4 | 1925 | |
2722971c | 1926 | if (*len < sizeof(get)) { |
c9d8fe13 | 1927 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1928 | return -EINVAL; |
2722971c | 1929 | } |
1da177e4 | 1930 | |
2722971c DM |
1931 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1932 | return -EFAULT; | |
1da177e4 | 1933 | |
2722971c | 1934 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1935 | duprintf("compat_get_entries: %u != %zu\n", |
1936 | *len, sizeof(get) + get.size); | |
2722971c | 1937 | return -EINVAL; |
1da177e4 | 1938 | } |
b301f253 | 1939 | get.name[sizeof(get.name) - 1] = '\0'; |
1da177e4 | 1940 | |
2722971c | 1941 | xt_compat_lock(AF_INET); |
34bd137b | 1942 | t = xt_find_table_lock(net, AF_INET, get.name); |
0cc8d8df | 1943 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1944 | const struct xt_table_info *private = t->private; |
2722971c | 1945 | struct xt_table_info info; |
9c547959 | 1946 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1947 | ret = compat_table_info(private, &info); |
1948 | if (!ret && get.size == info.size) { | |
1949 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 1950 | t, uptr->entrytable); |
2722971c DM |
1951 | } else if (!ret) { |
1952 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1953 | private->size, get.size); |
544473c1 | 1954 | ret = -EAGAIN; |
2722971c | 1955 | } |
b386d9f5 | 1956 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1957 | module_put(t->me); |
1958 | xt_table_unlock(t); | |
1959 | } else | |
1da177e4 | 1960 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1961 | |
2722971c DM |
1962 | xt_compat_unlock(AF_INET); |
1963 | return ret; | |
1964 | } | |
1da177e4 | 1965 | |
79030ed0 PM |
1966 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1967 | ||
2722971c DM |
1968 | static int |
1969 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1970 | { | |
1971 | int ret; | |
1da177e4 | 1972 | |
52e804c6 | 1973 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
82fac054 BS |
1974 | return -EPERM; |
1975 | ||
2722971c DM |
1976 | switch (cmd) { |
1977 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1978 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1979 | break; |
1980 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1981 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1982 | break; |
1983 | default: | |
79030ed0 | 1984 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1985 | } |
1da177e4 LT |
1986 | return ret; |
1987 | } | |
2722971c | 1988 | #endif |
1da177e4 LT |
1989 | |
1990 | static int | |
9c547959 | 1991 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
1992 | { |
1993 | int ret; | |
1994 | ||
52e804c6 | 1995 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1996 | return -EPERM; |
1997 | ||
1998 | switch (cmd) { | |
1999 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 2000 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2001 | break; |
2002 | ||
2003 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2004 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2005 | break; |
2006 | ||
2007 | default: | |
2008 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
2009 | ret = -EINVAL; | |
2010 | } | |
2011 | ||
2012 | return ret; | |
2013 | } | |
2014 | ||
2015 | static int | |
2016 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2017 | { | |
2018 | int ret; | |
2019 | ||
52e804c6 | 2020 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2021 | return -EPERM; |
2022 | ||
2023 | switch (cmd) { | |
2722971c | 2024 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2025 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2026 | break; |
1da177e4 | 2027 | |
2722971c | 2028 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2029 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2030 | break; |
1da177e4 LT |
2031 | |
2032 | case IPT_SO_GET_REVISION_MATCH: | |
2033 | case IPT_SO_GET_REVISION_TARGET: { | |
12b00c2c | 2034 | struct xt_get_revision rev; |
2e4e6a17 | 2035 | int target; |
1da177e4 LT |
2036 | |
2037 | if (*len != sizeof(rev)) { | |
2038 | ret = -EINVAL; | |
2039 | break; | |
2040 | } | |
2041 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2042 | ret = -EFAULT; | |
2043 | break; | |
2044 | } | |
78b79876 | 2045 | rev.name[sizeof(rev.name)-1] = 0; |
1da177e4 LT |
2046 | |
2047 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2048 | target = 1; |
1da177e4 | 2049 | else |
2e4e6a17 | 2050 | target = 0; |
1da177e4 | 2051 | |
2e4e6a17 HW |
2052 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2053 | rev.revision, | |
2054 | target, &ret), | |
1da177e4 LT |
2055 | "ipt_%s", rev.name); |
2056 | break; | |
2057 | } | |
2058 | ||
2059 | default: | |
2060 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2061 | ret = -EINVAL; | |
2062 | } | |
2063 | ||
2064 | return ret; | |
2065 | } | |
2066 | ||
b9e69e12 FW |
2067 | static void __ipt_unregister_table(struct net *net, struct xt_table *table) |
2068 | { | |
2069 | struct xt_table_info *private; | |
2070 | void *loc_cpu_entry; | |
2071 | struct module *table_owner = table->me; | |
2072 | struct ipt_entry *iter; | |
2073 | ||
2074 | private = xt_unregister_table(table); | |
2075 | ||
2076 | /* Decrease module usage counts and free resources */ | |
2077 | loc_cpu_entry = private->entries; | |
2078 | xt_entry_foreach(iter, loc_cpu_entry, private->size) | |
2079 | cleanup_entry(iter, net); | |
2080 | if (private->number > private->initial_entries) | |
2081 | module_put(table_owner); | |
2082 | xt_free_table_info(private); | |
2083 | } | |
2084 | ||
a67dd266 FW |
2085 | int ipt_register_table(struct net *net, const struct xt_table *table, |
2086 | const struct ipt_replace *repl, | |
2087 | const struct nf_hook_ops *ops, struct xt_table **res) | |
1da177e4 LT |
2088 | { |
2089 | int ret; | |
2e4e6a17 | 2090 | struct xt_table_info *newinfo; |
f3c5c1bf | 2091 | struct xt_table_info bootstrap = {0}; |
31836064 | 2092 | void *loc_cpu_entry; |
a98da11d | 2093 | struct xt_table *new_table; |
1da177e4 | 2094 | |
2e4e6a17 | 2095 | newinfo = xt_alloc_table_info(repl->size); |
a67dd266 FW |
2096 | if (!newinfo) |
2097 | return -ENOMEM; | |
1da177e4 | 2098 | |
482cfc31 | 2099 | loc_cpu_entry = newinfo->entries; |
31836064 | 2100 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
1da177e4 | 2101 | |
0f234214 | 2102 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2103 | if (ret != 0) |
2104 | goto out_free; | |
1da177e4 | 2105 | |
44d34e72 | 2106 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2107 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2108 | ret = PTR_ERR(new_table); |
2109 | goto out_free; | |
1da177e4 LT |
2110 | } |
2111 | ||
b9e69e12 | 2112 | /* set res now, will see skbs right after nf_register_net_hooks */ |
a67dd266 | 2113 | WRITE_ONCE(*res, new_table); |
b9e69e12 FW |
2114 | |
2115 | ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks)); | |
2116 | if (ret != 0) { | |
2117 | __ipt_unregister_table(net, new_table); | |
2118 | *res = NULL; | |
2119 | } | |
2120 | ||
a67dd266 | 2121 | return ret; |
44d34e72 AD |
2122 | |
2123 | out_free: | |
2124 | xt_free_table_info(newinfo); | |
a67dd266 | 2125 | return ret; |
1da177e4 LT |
2126 | } |
2127 | ||
a67dd266 FW |
2128 | void ipt_unregister_table(struct net *net, struct xt_table *table, |
2129 | const struct nf_hook_ops *ops) | |
1da177e4 | 2130 | { |
b9e69e12 FW |
2131 | nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks)); |
2132 | __ipt_unregister_table(net, table); | |
1da177e4 LT |
2133 | } |
2134 | ||
2135 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2136 | static inline bool |
1da177e4 LT |
2137 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2138 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2139 | bool invert) |
1da177e4 | 2140 | { |
9c547959 PM |
2141 | return ((test_type == 0xFF) || |
2142 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2143 | ^ invert; |
2144 | } | |
2145 | ||
1d93a9cb | 2146 | static bool |
62fc8051 | 2147 | icmp_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2148 | { |
5452e425 JE |
2149 | const struct icmphdr *ic; |
2150 | struct icmphdr _icmph; | |
f7108a20 | 2151 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2152 | |
2153 | /* Must not be a fragment. */ | |
f7108a20 | 2154 | if (par->fragoff != 0) |
1d93a9cb | 2155 | return false; |
1da177e4 | 2156 | |
f7108a20 | 2157 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2158 | if (ic == NULL) { |
2159 | /* We've been asked to examine this packet, and we | |
2160 | * can't. Hence, no choice but to drop. | |
2161 | */ | |
2162 | duprintf("Dropping evil ICMP tinygram.\n"); | |
b4ba2611 | 2163 | par->hotdrop = true; |
1d93a9cb | 2164 | return false; |
1da177e4 LT |
2165 | } |
2166 | ||
2167 | return icmp_type_code_match(icmpinfo->type, | |
2168 | icmpinfo->code[0], | |
2169 | icmpinfo->code[1], | |
2170 | ic->type, ic->code, | |
2171 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2172 | } | |
2173 | ||
b0f38452 | 2174 | static int icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2175 | { |
9b4fce7a | 2176 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2177 | |
1d5cd909 | 2178 | /* Must specify no unknown invflags */ |
bd414ee6 | 2179 | return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2180 | } |
2181 | ||
4538506b JE |
2182 | static struct xt_target ipt_builtin_tg[] __read_mostly = { |
2183 | { | |
243bf6e2 | 2184 | .name = XT_STANDARD_TARGET, |
4538506b JE |
2185 | .targetsize = sizeof(int), |
2186 | .family = NFPROTO_IPV4, | |
2722971c | 2187 | #ifdef CONFIG_COMPAT |
4538506b JE |
2188 | .compatsize = sizeof(compat_int_t), |
2189 | .compat_from_user = compat_standard_from_user, | |
2190 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2191 | #endif |
4538506b JE |
2192 | }, |
2193 | { | |
243bf6e2 | 2194 | .name = XT_ERROR_TARGET, |
4538506b | 2195 | .target = ipt_error, |
12b00c2c | 2196 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
2197 | .family = NFPROTO_IPV4, |
2198 | }, | |
1da177e4 LT |
2199 | }; |
2200 | ||
2201 | static struct nf_sockopt_ops ipt_sockopts = { | |
2202 | .pf = PF_INET, | |
2203 | .set_optmin = IPT_BASE_CTL, | |
2204 | .set_optmax = IPT_SO_SET_MAX+1, | |
2205 | .set = do_ipt_set_ctl, | |
2722971c DM |
2206 | #ifdef CONFIG_COMPAT |
2207 | .compat_set = compat_do_ipt_set_ctl, | |
2208 | #endif | |
1da177e4 LT |
2209 | .get_optmin = IPT_BASE_CTL, |
2210 | .get_optmax = IPT_SO_GET_MAX+1, | |
2211 | .get = do_ipt_get_ctl, | |
2722971c DM |
2212 | #ifdef CONFIG_COMPAT |
2213 | .compat_get = compat_do_ipt_get_ctl, | |
2214 | #endif | |
16fcec35 | 2215 | .owner = THIS_MODULE, |
1da177e4 LT |
2216 | }; |
2217 | ||
4538506b JE |
2218 | static struct xt_match ipt_builtin_mt[] __read_mostly = { |
2219 | { | |
2220 | .name = "icmp", | |
2221 | .match = icmp_match, | |
2222 | .matchsize = sizeof(struct ipt_icmp), | |
2223 | .checkentry = icmp_checkentry, | |
2224 | .proto = IPPROTO_ICMP, | |
2225 | .family = NFPROTO_IPV4, | |
2226 | }, | |
1da177e4 LT |
2227 | }; |
2228 | ||
3cb609d5 AD |
2229 | static int __net_init ip_tables_net_init(struct net *net) |
2230 | { | |
383ca5b8 | 2231 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
2232 | } |
2233 | ||
2234 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2235 | { | |
383ca5b8 | 2236 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
2237 | } |
2238 | ||
2239 | static struct pernet_operations ip_tables_net_ops = { | |
2240 | .init = ip_tables_net_init, | |
2241 | .exit = ip_tables_net_exit, | |
2242 | }; | |
2243 | ||
65b4b4e8 | 2244 | static int __init ip_tables_init(void) |
1da177e4 LT |
2245 | { |
2246 | int ret; | |
2247 | ||
3cb609d5 | 2248 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2249 | if (ret < 0) |
2250 | goto err1; | |
2e4e6a17 | 2251 | |
25985edc | 2252 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 2253 | ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 PM |
2254 | if (ret < 0) |
2255 | goto err2; | |
4538506b | 2256 | ret = xt_register_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 PM |
2257 | if (ret < 0) |
2258 | goto err4; | |
1da177e4 LT |
2259 | |
2260 | /* Register setsockopt */ | |
2261 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2262 | if (ret < 0) |
2263 | goto err5; | |
1da177e4 | 2264 | |
ff67e4e4 | 2265 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2266 | return 0; |
0eff66e6 PM |
2267 | |
2268 | err5: | |
4538506b | 2269 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 | 2270 | err4: |
4538506b | 2271 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 | 2272 | err2: |
3cb609d5 | 2273 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2274 | err1: |
2275 | return ret; | |
1da177e4 LT |
2276 | } |
2277 | ||
65b4b4e8 | 2278 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2279 | { |
2280 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2281 | |
4538506b JE |
2282 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
2283 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); | |
3cb609d5 | 2284 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2285 | } |
2286 | ||
2287 | EXPORT_SYMBOL(ipt_register_table); | |
2288 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2289 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2290 | module_init(ip_tables_init); |
2291 | module_exit(ip_tables_fini); |