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Commit | Line | Data |
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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 | ||
36472341 FW |
446 | static bool find_jump_target(const struct xt_table_info *t, |
447 | const struct ipt_entry *target) | |
448 | { | |
449 | struct ipt_entry *iter; | |
450 | ||
451 | xt_entry_foreach(iter, t->entries, t->size) { | |
452 | if (iter == target) | |
453 | return true; | |
454 | } | |
455 | return false; | |
456 | } | |
457 | ||
1da177e4 | 458 | /* Figures out from what hook each rule can be called: returns 0 if |
98dbbfc3 | 459 | there are loops. Puts hook bitmask in comefrom. */ |
1da177e4 | 460 | static int |
98dbbfc3 | 461 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 462 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
463 | { |
464 | unsigned int hook; | |
465 | ||
466 | /* No recursion; use packet counter to save back ptrs (reset | |
467 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 468 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 469 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 470 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
471 | |
472 | if (!(valid_hooks & (1 << hook))) | |
473 | continue; | |
474 | ||
475 | /* Set initial back pointer. */ | |
476 | e->counters.pcnt = pos; | |
477 | ||
478 | for (;;) { | |
87a2e70d | 479 | const struct xt_standard_target *t |
d5d1baa1 | 480 | = (void *)ipt_get_target_c(e); |
e1b4b9f3 | 481 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 482 | |
6e23ae2a | 483 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
654d0fbd | 484 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
485 | hook, pos, e->comefrom); |
486 | return 0; | |
487 | } | |
9c547959 | 488 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
489 | |
490 | /* Unconditional return/END. */ | |
54d83fc7 | 491 | if ((unconditional(e) && |
3666ed1c | 492 | (strcmp(t->target.u.user.name, |
243bf6e2 | 493 | XT_STANDARD_TARGET) == 0) && |
54d83fc7 | 494 | t->verdict < 0) || visited) { |
1da177e4 LT |
495 | unsigned int oldpos, size; |
496 | ||
1f9352ae | 497 | if ((strcmp(t->target.u.user.name, |
24cebe3f | 498 | XT_STANDARD_TARGET) == 0) && |
1f9352ae | 499 | t->verdict < -NF_MAX_VERDICT - 1) { |
74c9c0c1 DM |
500 | duprintf("mark_source_chains: bad " |
501 | "negative verdict (%i)\n", | |
502 | t->verdict); | |
503 | return 0; | |
504 | } | |
505 | ||
1da177e4 LT |
506 | /* Return: backtrack through the last |
507 | big jump. */ | |
508 | do { | |
6e23ae2a | 509 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
510 | #ifdef DEBUG_IP_FIREWALL_USER |
511 | if (e->comefrom | |
6e23ae2a | 512 | & (1 << NF_INET_NUMHOOKS)) { |
1da177e4 LT |
513 | duprintf("Back unset " |
514 | "on hook %u " | |
515 | "rule %u\n", | |
516 | hook, pos); | |
517 | } | |
518 | #endif | |
519 | oldpos = pos; | |
520 | pos = e->counters.pcnt; | |
521 | e->counters.pcnt = 0; | |
522 | ||
523 | /* We're at the start. */ | |
524 | if (pos == oldpos) | |
525 | goto next; | |
526 | ||
527 | e = (struct ipt_entry *) | |
31836064 | 528 | (entry0 + pos); |
1da177e4 LT |
529 | } while (oldpos == pos + e->next_offset); |
530 | ||
531 | /* Move along one */ | |
532 | size = e->next_offset; | |
533 | e = (struct ipt_entry *) | |
31836064 | 534 | (entry0 + pos + size); |
f24e230d FW |
535 | if (pos + size >= newinfo->size) |
536 | return 0; | |
1da177e4 LT |
537 | e->counters.pcnt = pos; |
538 | pos += size; | |
539 | } else { | |
540 | int newpos = t->verdict; | |
541 | ||
542 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 543 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 544 | newpos >= 0) { |
74c9c0c1 DM |
545 | if (newpos > newinfo->size - |
546 | sizeof(struct ipt_entry)) { | |
547 | duprintf("mark_source_chains: " | |
548 | "bad verdict (%i)\n", | |
549 | newpos); | |
550 | return 0; | |
551 | } | |
1da177e4 | 552 | /* This a jump; chase it. */ |
98dbbfc3 FW |
553 | duprintf("Jump rule %u -> %u\n", |
554 | pos, newpos); | |
36472341 FW |
555 | e = (struct ipt_entry *) |
556 | (entry0 + newpos); | |
557 | if (!find_jump_target(newinfo, e)) | |
558 | return 0; | |
1da177e4 LT |
559 | } else { |
560 | /* ... this is a fallthru */ | |
561 | newpos = pos + e->next_offset; | |
f24e230d FW |
562 | if (newpos >= newinfo->size) |
563 | return 0; | |
1da177e4 LT |
564 | } |
565 | e = (struct ipt_entry *) | |
31836064 | 566 | (entry0 + newpos); |
1da177e4 LT |
567 | e->counters.pcnt = pos; |
568 | pos = newpos; | |
569 | } | |
570 | } | |
19f0a602 | 571 | next: |
1da177e4 LT |
572 | duprintf("Finished chain %u\n", hook); |
573 | } | |
574 | return 1; | |
575 | } | |
576 | ||
87a2e70d | 577 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 578 | { |
6be3d859 JE |
579 | struct xt_mtdtor_param par; |
580 | ||
f54e9367 | 581 | par.net = net; |
6be3d859 JE |
582 | par.match = m->u.kernel.match; |
583 | par.matchinfo = m->data; | |
916a917d | 584 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
585 | if (par.match->destroy != NULL) |
586 | par.match->destroy(&par); | |
587 | module_put(par.match->me); | |
1da177e4 LT |
588 | } |
589 | ||
022748a9 | 590 | static int |
87a2e70d | 591 | check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
a96be246 | 592 | { |
9b4fce7a | 593 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 DM |
594 | int ret; |
595 | ||
9b4fce7a JE |
596 | par->match = m->u.kernel.match; |
597 | par->matchinfo = m->data; | |
598 | ||
916a917d | 599 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
9b4fce7a | 600 | ip->proto, ip->invflags & IPT_INV_PROTO); |
367c6790 | 601 | if (ret < 0) { |
b5cad0df | 602 | duprintf("check failed for `%s'.\n", par->match->name); |
367c6790 | 603 | return ret; |
a96be246 | 604 | } |
367c6790 | 605 | return 0; |
a96be246 DM |
606 | } |
607 | ||
022748a9 | 608 | static int |
87a2e70d | 609 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 610 | { |
6709dbbb | 611 | struct xt_match *match; |
3cdc7c95 | 612 | int ret; |
1da177e4 | 613 | |
fd0ec0e6 JE |
614 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
615 | m->u.user.revision); | |
616 | if (IS_ERR(match)) { | |
a96be246 | 617 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
fd0ec0e6 | 618 | return PTR_ERR(match); |
1da177e4 LT |
619 | } |
620 | m->u.kernel.match = match; | |
621 | ||
6bdb331b | 622 | ret = check_match(m, par); |
3cdc7c95 PM |
623 | if (ret) |
624 | goto err; | |
625 | ||
1da177e4 | 626 | return 0; |
3cdc7c95 PM |
627 | err: |
628 | module_put(m->u.kernel.match->me); | |
629 | return ret; | |
1da177e4 LT |
630 | } |
631 | ||
add67461 | 632 | static int check_target(struct ipt_entry *e, struct net *net, const char *name) |
a96be246 | 633 | { |
87a2e70d | 634 | struct xt_entry_target *t = ipt_get_target(e); |
af5d6dc2 | 635 | struct xt_tgchk_param par = { |
add67461 | 636 | .net = net, |
af5d6dc2 JE |
637 | .table = name, |
638 | .entryinfo = e, | |
639 | .target = t->u.kernel.target, | |
640 | .targinfo = t->data, | |
641 | .hook_mask = e->comefrom, | |
916a917d | 642 | .family = NFPROTO_IPV4, |
af5d6dc2 | 643 | }; |
e905a9ed | 644 | int ret; |
a96be246 | 645 | |
916a917d | 646 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
af5d6dc2 | 647 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
367c6790 | 648 | if (ret < 0) { |
ff67e4e4 | 649 | duprintf("check failed for `%s'.\n", |
a96be246 | 650 | t->u.kernel.target->name); |
367c6790 | 651 | return ret; |
a96be246 | 652 | } |
367c6790 | 653 | return 0; |
a96be246 | 654 | } |
1da177e4 | 655 | |
022748a9 | 656 | static int |
a83d8e8d | 657 | find_check_entry(struct ipt_entry *e, struct net *net, const char *name, |
0559518b | 658 | unsigned int size) |
1da177e4 | 659 | { |
87a2e70d | 660 | struct xt_entry_target *t; |
6709dbbb | 661 | struct xt_target *target; |
1da177e4 LT |
662 | int ret; |
663 | unsigned int j; | |
9b4fce7a | 664 | struct xt_mtchk_param mtpar; |
dcea992a | 665 | struct xt_entry_match *ematch; |
1da177e4 | 666 | |
71ae0dff FW |
667 | e->counters.pcnt = xt_percpu_counter_alloc(); |
668 | if (IS_ERR_VALUE(e->counters.pcnt)) | |
669 | return -ENOMEM; | |
670 | ||
1da177e4 | 671 | j = 0; |
a83d8e8d | 672 | mtpar.net = net; |
9b4fce7a JE |
673 | mtpar.table = name; |
674 | mtpar.entryinfo = &e->ip; | |
675 | mtpar.hook_mask = e->comefrom; | |
916a917d | 676 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 677 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 678 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 679 | if (ret != 0) |
6bdb331b JE |
680 | goto cleanup_matches; |
681 | ++j; | |
dcea992a | 682 | } |
1da177e4 LT |
683 | |
684 | t = ipt_get_target(e); | |
d2a7b6ba JE |
685 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
686 | t->u.user.revision); | |
687 | if (IS_ERR(target)) { | |
a96be246 | 688 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 689 | ret = PTR_ERR(target); |
1da177e4 LT |
690 | goto cleanup_matches; |
691 | } | |
692 | t->u.kernel.target = target; | |
693 | ||
add67461 | 694 | ret = check_target(e, net, name); |
3cdc7c95 PM |
695 | if (ret) |
696 | goto err; | |
71ae0dff | 697 | |
1da177e4 | 698 | return 0; |
3cdc7c95 PM |
699 | err: |
700 | module_put(t->u.kernel.target->me); | |
1da177e4 | 701 | cleanup_matches: |
6bdb331b JE |
702 | xt_ematch_foreach(ematch, e) { |
703 | if (j-- == 0) | |
dcea992a | 704 | break; |
6bdb331b JE |
705 | cleanup_match(ematch, net); |
706 | } | |
71ae0dff FW |
707 | |
708 | xt_percpu_counter_free(e->counters.pcnt); | |
709 | ||
1da177e4 LT |
710 | return ret; |
711 | } | |
712 | ||
d5d1baa1 | 713 | static bool check_underflow(const struct ipt_entry *e) |
e2fe35c1 | 714 | { |
87a2e70d | 715 | const struct xt_entry_target *t; |
e2fe35c1 JE |
716 | unsigned int verdict; |
717 | ||
54d83fc7 | 718 | if (!unconditional(e)) |
e2fe35c1 | 719 | return false; |
d5d1baa1 | 720 | t = ipt_get_target_c(e); |
e2fe35c1 JE |
721 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
722 | return false; | |
87a2e70d | 723 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
724 | verdict = -verdict - 1; |
725 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
726 | } | |
727 | ||
022748a9 | 728 | static int |
1da177e4 | 729 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 730 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
731 | const unsigned char *base, |
732 | const unsigned char *limit, | |
1da177e4 LT |
733 | const unsigned int *hook_entries, |
734 | const unsigned int *underflows, | |
0559518b | 735 | unsigned int valid_hooks) |
1da177e4 LT |
736 | { |
737 | unsigned int h; | |
bdf533de | 738 | int err; |
1da177e4 | 739 | |
3666ed1c | 740 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 || |
6e94e0cf FW |
741 | (unsigned char *)e + sizeof(struct ipt_entry) >= limit || |
742 | (unsigned char *)e + e->next_offset > limit) { | |
1da177e4 LT |
743 | duprintf("Bad offset %p\n", e); |
744 | return -EINVAL; | |
745 | } | |
746 | ||
747 | if (e->next_offset | |
87a2e70d | 748 | < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target)) { |
1da177e4 LT |
749 | duprintf("checking: element %p size %u\n", |
750 | e, e->next_offset); | |
751 | return -EINVAL; | |
752 | } | |
753 | ||
aa412ba2 FW |
754 | if (!ip_checkentry(&e->ip)) |
755 | return -EINVAL; | |
756 | ||
ce683e5f FW |
757 | err = xt_check_entry_offsets(e, e->elems, e->target_offset, |
758 | e->next_offset); | |
bdf533de FW |
759 | if (err) |
760 | return err; | |
761 | ||
1da177e4 | 762 | /* Check hooks & underflows */ |
6e23ae2a | 763 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
764 | if (!(valid_hooks & (1 << h))) |
765 | continue; | |
1da177e4 LT |
766 | if ((unsigned char *)e - base == hook_entries[h]) |
767 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 768 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 | 769 | if (!check_underflow(e)) { |
54d83fc7 FW |
770 | pr_debug("Underflows must be unconditional and " |
771 | "use the STANDARD target with " | |
772 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
773 | return -EINVAL; |
774 | } | |
1da177e4 | 775 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 776 | } |
1da177e4 LT |
777 | } |
778 | ||
1da177e4 | 779 | /* Clear counters and comefrom */ |
2e4e6a17 | 780 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 781 | e->comefrom = 0; |
1da177e4 LT |
782 | return 0; |
783 | } | |
784 | ||
0559518b JE |
785 | static void |
786 | cleanup_entry(struct ipt_entry *e, struct net *net) | |
1da177e4 | 787 | { |
a2df1648 | 788 | struct xt_tgdtor_param par; |
87a2e70d | 789 | struct xt_entry_target *t; |
dcea992a | 790 | struct xt_entry_match *ematch; |
1da177e4 | 791 | |
1da177e4 | 792 | /* Cleanup all matches */ |
dcea992a | 793 | xt_ematch_foreach(ematch, e) |
6bdb331b | 794 | cleanup_match(ematch, net); |
1da177e4 | 795 | t = ipt_get_target(e); |
a2df1648 | 796 | |
add67461 | 797 | par.net = net; |
a2df1648 JE |
798 | par.target = t->u.kernel.target; |
799 | par.targinfo = t->data; | |
916a917d | 800 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
801 | if (par.target->destroy != NULL) |
802 | par.target->destroy(&par); | |
803 | module_put(par.target->me); | |
71ae0dff | 804 | xt_percpu_counter_free(e->counters.pcnt); |
1da177e4 LT |
805 | } |
806 | ||
807 | /* Checks and translates the user-supplied table segment (held in | |
808 | newinfo) */ | |
809 | static int | |
0f234214 | 810 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
6c28255b | 811 | const struct ipt_replace *repl) |
1da177e4 | 812 | { |
72b2b1dd | 813 | struct ipt_entry *iter; |
1da177e4 | 814 | unsigned int i; |
72b2b1dd | 815 | int ret = 0; |
1da177e4 | 816 | |
0f234214 JE |
817 | newinfo->size = repl->size; |
818 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
819 | |
820 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 821 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
822 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
823 | newinfo->underflow[i] = 0xFFFFFFFF; | |
824 | } | |
825 | ||
826 | duprintf("translate_table: size %u\n", newinfo->size); | |
827 | i = 0; | |
828 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
829 | xt_entry_foreach(iter, entry0, newinfo->size) { |
830 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
831 | entry0 + repl->size, |
832 | repl->hook_entry, | |
833 | repl->underflow, | |
834 | repl->valid_hooks); | |
72b2b1dd | 835 | if (ret != 0) |
0559518b JE |
836 | return ret; |
837 | ++i; | |
98dbbfc3 FW |
838 | if (strcmp(ipt_get_target(iter)->u.user.name, |
839 | XT_ERROR_TARGET) == 0) | |
840 | ++newinfo->stacksize; | |
72b2b1dd | 841 | } |
1da177e4 | 842 | |
0f234214 | 843 | if (i != repl->num_entries) { |
1da177e4 | 844 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 845 | i, repl->num_entries); |
1da177e4 LT |
846 | return -EINVAL; |
847 | } | |
848 | ||
849 | /* Check hooks all assigned */ | |
6e23ae2a | 850 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 851 | /* Only hooks which are valid */ |
0f234214 | 852 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
853 | continue; |
854 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
855 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 856 | i, repl->hook_entry[i]); |
1da177e4 LT |
857 | return -EINVAL; |
858 | } | |
859 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
860 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 861 | i, repl->underflow[i]); |
1da177e4 LT |
862 | return -EINVAL; |
863 | } | |
864 | } | |
865 | ||
0f234214 | 866 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
867 | return -ELOOP; |
868 | ||
1da177e4 LT |
869 | /* Finally, each sanity check must pass */ |
870 | i = 0; | |
72b2b1dd | 871 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 872 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
873 | if (ret != 0) |
874 | break; | |
0559518b | 875 | ++i; |
72b2b1dd | 876 | } |
1da177e4 | 877 | |
74c9c0c1 | 878 | if (ret != 0) { |
0559518b JE |
879 | xt_entry_foreach(iter, entry0, newinfo->size) { |
880 | if (i-- == 0) | |
72b2b1dd | 881 | break; |
0559518b JE |
882 | cleanup_entry(iter, net); |
883 | } | |
74c9c0c1 DM |
884 | return ret; |
885 | } | |
1da177e4 | 886 | |
1da177e4 LT |
887 | return ret; |
888 | } | |
889 | ||
1da177e4 | 890 | static void |
2e4e6a17 HW |
891 | get_counters(const struct xt_table_info *t, |
892 | struct xt_counters counters[]) | |
1da177e4 | 893 | { |
72b2b1dd | 894 | struct ipt_entry *iter; |
1da177e4 LT |
895 | unsigned int cpu; |
896 | unsigned int i; | |
897 | ||
6f912042 | 898 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 899 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 900 | |
1da177e4 | 901 | i = 0; |
482cfc31 | 902 | xt_entry_foreach(iter, t->entries, t->size) { |
71ae0dff | 903 | struct xt_counters *tmp; |
83723d60 ED |
904 | u64 bcnt, pcnt; |
905 | unsigned int start; | |
906 | ||
71ae0dff | 907 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
83723d60 | 908 | do { |
7f5c6d4f | 909 | start = read_seqcount_begin(s); |
71ae0dff FW |
910 | bcnt = tmp->bcnt; |
911 | pcnt = tmp->pcnt; | |
7f5c6d4f | 912 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
913 | |
914 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
915 | ++i; /* macro does multi eval of i */ |
916 | } | |
1da177e4 | 917 | } |
78454473 SH |
918 | } |
919 | ||
d5d1baa1 | 920 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 921 | { |
2722971c | 922 | unsigned int countersize; |
2e4e6a17 | 923 | struct xt_counters *counters; |
d5d1baa1 | 924 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
925 | |
926 | /* We need atomic snapshot of counters: rest doesn't change | |
927 | (other than comefrom, which userspace doesn't care | |
928 | about). */ | |
2e4e6a17 | 929 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 930 | counters = vzalloc(countersize); |
1da177e4 LT |
931 | |
932 | if (counters == NULL) | |
942e4a2b | 933 | return ERR_PTR(-ENOMEM); |
78454473 | 934 | |
942e4a2b | 935 | get_counters(private, counters); |
1da177e4 | 936 | |
2722971c DM |
937 | return counters; |
938 | } | |
939 | ||
940 | static int | |
941 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 942 | const struct xt_table *table, |
2722971c DM |
943 | void __user *userptr) |
944 | { | |
945 | unsigned int off, num; | |
d5d1baa1 | 946 | const struct ipt_entry *e; |
2722971c | 947 | struct xt_counters *counters; |
5452e425 | 948 | const struct xt_table_info *private = table->private; |
2722971c | 949 | int ret = 0; |
711bdde6 | 950 | const void *loc_cpu_entry; |
2722971c DM |
951 | |
952 | counters = alloc_counters(table); | |
953 | if (IS_ERR(counters)) | |
954 | return PTR_ERR(counters); | |
955 | ||
482cfc31 | 956 | loc_cpu_entry = private->entries; |
31836064 | 957 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
958 | ret = -EFAULT; |
959 | goto free_counters; | |
960 | } | |
961 | ||
962 | /* FIXME: use iterator macros --RR */ | |
963 | /* ... then go back and fix counters and names */ | |
964 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
965 | unsigned int i; | |
87a2e70d JE |
966 | const struct xt_entry_match *m; |
967 | const struct xt_entry_target *t; | |
1da177e4 | 968 | |
31836064 | 969 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
970 | if (copy_to_user(userptr + off |
971 | + offsetof(struct ipt_entry, counters), | |
972 | &counters[num], | |
973 | sizeof(counters[num])) != 0) { | |
974 | ret = -EFAULT; | |
975 | goto free_counters; | |
976 | } | |
977 | ||
978 | for (i = sizeof(struct ipt_entry); | |
979 | i < e->target_offset; | |
980 | i += m->u.match_size) { | |
981 | m = (void *)e + i; | |
982 | ||
983 | if (copy_to_user(userptr + off + i | |
87a2e70d | 984 | + offsetof(struct xt_entry_match, |
1da177e4 LT |
985 | u.user.name), |
986 | m->u.kernel.match->name, | |
987 | strlen(m->u.kernel.match->name)+1) | |
988 | != 0) { | |
989 | ret = -EFAULT; | |
990 | goto free_counters; | |
991 | } | |
992 | } | |
993 | ||
d5d1baa1 | 994 | t = ipt_get_target_c(e); |
1da177e4 | 995 | if (copy_to_user(userptr + off + e->target_offset |
87a2e70d | 996 | + offsetof(struct xt_entry_target, |
1da177e4 LT |
997 | u.user.name), |
998 | t->u.kernel.target->name, | |
999 | strlen(t->u.kernel.target->name)+1) != 0) { | |
1000 | ret = -EFAULT; | |
1001 | goto free_counters; | |
1002 | } | |
1003 | } | |
1004 | ||
1005 | free_counters: | |
1006 | vfree(counters); | |
1007 | return ret; | |
1008 | } | |
1009 | ||
2722971c | 1010 | #ifdef CONFIG_COMPAT |
739674fb | 1011 | static void compat_standard_from_user(void *dst, const void *src) |
2722971c | 1012 | { |
9fa492cd | 1013 | int v = *(compat_int_t *)src; |
2722971c | 1014 | |
9fa492cd | 1015 | if (v > 0) |
b386d9f5 | 1016 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
1017 | memcpy(dst, &v, sizeof(v)); |
1018 | } | |
46c5ea3c | 1019 | |
739674fb | 1020 | static int compat_standard_to_user(void __user *dst, const void *src) |
2722971c | 1021 | { |
9fa492cd | 1022 | compat_int_t cv = *(int *)src; |
2722971c | 1023 | |
9fa492cd | 1024 | if (cv > 0) |
b386d9f5 | 1025 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 1026 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
1027 | } |
1028 | ||
d5d1baa1 | 1029 | static int compat_calc_entry(const struct ipt_entry *e, |
4b478248 | 1030 | const struct xt_table_info *info, |
d5d1baa1 | 1031 | const void *base, struct xt_table_info *newinfo) |
2722971c | 1032 | { |
dcea992a | 1033 | const struct xt_entry_match *ematch; |
87a2e70d | 1034 | const struct xt_entry_target *t; |
e5b5ef7d | 1035 | unsigned int entry_offset; |
2722971c DM |
1036 | int off, i, ret; |
1037 | ||
30c08c41 | 1038 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c | 1039 | entry_offset = (void *)e - base; |
dcea992a | 1040 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1041 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 1042 | t = ipt_get_target_c(e); |
9fa492cd | 1043 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 1044 | newinfo->size -= off; |
b386d9f5 | 1045 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1046 | if (ret) |
1047 | return ret; | |
1048 | ||
6e23ae2a | 1049 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
1050 | if (info->hook_entry[i] && |
1051 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 1052 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
1053 | if (info->underflow[i] && |
1054 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
1055 | newinfo->underflow[i] -= off; |
1056 | } | |
1057 | return 0; | |
1058 | } | |
1059 | ||
259d4e41 | 1060 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 1061 | struct xt_table_info *newinfo) |
2722971c | 1062 | { |
72b2b1dd | 1063 | struct ipt_entry *iter; |
711bdde6 | 1064 | const void *loc_cpu_entry; |
0559518b | 1065 | int ret; |
2722971c DM |
1066 | |
1067 | if (!newinfo || !info) | |
1068 | return -EINVAL; | |
1069 | ||
482cfc31 | 1070 | /* we dont care about newinfo->entries */ |
259d4e41 ED |
1071 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
1072 | newinfo->initial_entries = 0; | |
482cfc31 | 1073 | loc_cpu_entry = info->entries; |
255d0dc3 | 1074 | xt_compat_init_offsets(AF_INET, info->number); |
72b2b1dd JE |
1075 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
1076 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
1077 | if (ret != 0) | |
0559518b | 1078 | return ret; |
72b2b1dd | 1079 | } |
0559518b | 1080 | return 0; |
2722971c DM |
1081 | } |
1082 | #endif | |
1083 | ||
d5d1baa1 | 1084 | static int get_info(struct net *net, void __user *user, |
6c28255b | 1085 | const int *len, int compat) |
2722971c | 1086 | { |
12b00c2c | 1087 | char name[XT_TABLE_MAXNAMELEN]; |
e60a13e0 | 1088 | struct xt_table *t; |
2722971c DM |
1089 | int ret; |
1090 | ||
1091 | if (*len != sizeof(struct ipt_getinfo)) { | |
c9d8fe13 PM |
1092 | duprintf("length %u != %zu\n", *len, |
1093 | sizeof(struct ipt_getinfo)); | |
2722971c DM |
1094 | return -EINVAL; |
1095 | } | |
1096 | ||
1097 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
1098 | return -EFAULT; | |
1099 | ||
12b00c2c | 1100 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
2722971c DM |
1101 | #ifdef CONFIG_COMPAT |
1102 | if (compat) | |
1103 | xt_compat_lock(AF_INET); | |
1104 | #endif | |
34bd137b | 1105 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 1106 | "iptable_%s", name); |
0cc8d8df | 1107 | if (!IS_ERR_OR_NULL(t)) { |
2722971c | 1108 | struct ipt_getinfo info; |
5452e425 | 1109 | const struct xt_table_info *private = t->private; |
2722971c | 1110 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
1111 | struct xt_table_info tmp; |
1112 | ||
2722971c | 1113 | if (compat) { |
2722971c | 1114 | ret = compat_table_info(private, &tmp); |
b386d9f5 | 1115 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 1116 | private = &tmp; |
2722971c DM |
1117 | } |
1118 | #endif | |
b5f15ac4 | 1119 | memset(&info, 0, sizeof(info)); |
2722971c DM |
1120 | info.valid_hooks = t->valid_hooks; |
1121 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 1122 | sizeof(info.hook_entry)); |
2722971c | 1123 | memcpy(info.underflow, private->underflow, |
4b478248 | 1124 | sizeof(info.underflow)); |
2722971c DM |
1125 | info.num_entries = private->number; |
1126 | info.size = private->size; | |
1127 | strcpy(info.name, name); | |
1128 | ||
1129 | if (copy_to_user(user, &info, *len) != 0) | |
1130 | ret = -EFAULT; | |
1131 | else | |
1132 | ret = 0; | |
1133 | ||
1134 | xt_table_unlock(t); | |
1135 | module_put(t->me); | |
1136 | } else | |
1137 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1138 | #ifdef CONFIG_COMPAT | |
1139 | if (compat) | |
1140 | xt_compat_unlock(AF_INET); | |
1141 | #endif | |
1142 | return ret; | |
1143 | } | |
1144 | ||
1145 | static int | |
d5d1baa1 JE |
1146 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
1147 | const int *len) | |
2722971c DM |
1148 | { |
1149 | int ret; | |
1150 | struct ipt_get_entries get; | |
e60a13e0 | 1151 | struct xt_table *t; |
2722971c DM |
1152 | |
1153 | if (*len < sizeof(get)) { | |
c9d8fe13 | 1154 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
2722971c DM |
1155 | return -EINVAL; |
1156 | } | |
1157 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1158 | return -EFAULT; | |
1159 | if (*len != sizeof(struct ipt_get_entries) + get.size) { | |
c9d8fe13 PM |
1160 | duprintf("get_entries: %u != %zu\n", |
1161 | *len, sizeof(get) + get.size); | |
2722971c DM |
1162 | return -EINVAL; |
1163 | } | |
b301f253 | 1164 | get.name[sizeof(get.name) - 1] = '\0'; |
2722971c | 1165 | |
34bd137b | 1166 | t = xt_find_table_lock(net, AF_INET, get.name); |
0cc8d8df | 1167 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1168 | const struct xt_table_info *private = t->private; |
9c547959 | 1169 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1170 | if (get.size == private->size) |
1171 | ret = copy_entries_to_user(private->size, | |
1172 | t, uptr->entrytable); | |
1173 | else { | |
1174 | duprintf("get_entries: I've got %u not %u!\n", | |
9c547959 | 1175 | private->size, get.size); |
544473c1 | 1176 | ret = -EAGAIN; |
2722971c DM |
1177 | } |
1178 | module_put(t->me); | |
1179 | xt_table_unlock(t); | |
1180 | } else | |
1181 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1182 | ||
1183 | return ret; | |
1184 | } | |
1185 | ||
1186 | static int | |
34bd137b | 1187 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1188 | struct xt_table_info *newinfo, unsigned int num_counters, |
1189 | void __user *counters_ptr) | |
2722971c DM |
1190 | { |
1191 | int ret; | |
e60a13e0 | 1192 | struct xt_table *t; |
2722971c DM |
1193 | struct xt_table_info *oldinfo; |
1194 | struct xt_counters *counters; | |
72b2b1dd | 1195 | struct ipt_entry *iter; |
2722971c DM |
1196 | |
1197 | ret = 0; | |
83723d60 | 1198 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
2722971c DM |
1199 | if (!counters) { |
1200 | ret = -ENOMEM; | |
1201 | goto out; | |
1202 | } | |
1203 | ||
34bd137b | 1204 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c | 1205 | "iptable_%s", name); |
0cc8d8df | 1206 | if (IS_ERR_OR_NULL(t)) { |
2722971c DM |
1207 | ret = t ? PTR_ERR(t) : -ENOENT; |
1208 | goto free_newinfo_counters_untrans; | |
1209 | } | |
1210 | ||
1211 | /* You lied! */ | |
1212 | if (valid_hooks != t->valid_hooks) { | |
1213 | duprintf("Valid hook crap: %08X vs %08X\n", | |
1214 | valid_hooks, t->valid_hooks); | |
1215 | ret = -EINVAL; | |
1216 | goto put_module; | |
1217 | } | |
1218 | ||
1219 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1220 | if (!oldinfo) | |
1221 | goto put_module; | |
1222 | ||
1223 | /* Update module usage count based on number of rules */ | |
1224 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1225 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
1226 | if ((oldinfo->number > oldinfo->initial_entries) || | |
1227 | (newinfo->number <= oldinfo->initial_entries)) | |
1228 | module_put(t->me); | |
1229 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1230 | (newinfo->number <= oldinfo->initial_entries)) | |
1231 | module_put(t->me); | |
1232 | ||
942e4a2b | 1233 | /* Get the old counters, and synchronize with replace */ |
2722971c | 1234 | get_counters(oldinfo, counters); |
942e4a2b | 1235 | |
2722971c | 1236 | /* Decrease module usage counts and free resource */ |
482cfc31 | 1237 | xt_entry_foreach(iter, oldinfo->entries, oldinfo->size) |
0559518b | 1238 | cleanup_entry(iter, net); |
72b2b1dd | 1239 | |
2722971c DM |
1240 | xt_free_table_info(oldinfo); |
1241 | if (copy_to_user(counters_ptr, counters, | |
c58dd2dd TG |
1242 | sizeof(struct xt_counters) * num_counters) != 0) { |
1243 | /* Silent error, can't fail, new table is already in place */ | |
1244 | net_warn_ratelimited("iptables: counters copy to user failed while replacing table\n"); | |
1245 | } | |
2722971c DM |
1246 | vfree(counters); |
1247 | xt_table_unlock(t); | |
1248 | return ret; | |
1249 | ||
1250 | put_module: | |
1251 | module_put(t->me); | |
1252 | xt_table_unlock(t); | |
1253 | free_newinfo_counters_untrans: | |
1254 | vfree(counters); | |
1255 | out: | |
1256 | return ret; | |
1257 | } | |
1258 | ||
1259 | static int | |
d5d1baa1 | 1260 | do_replace(struct net *net, const void __user *user, unsigned int len) |
2722971c DM |
1261 | { |
1262 | int ret; | |
1263 | struct ipt_replace tmp; | |
1264 | struct xt_table_info *newinfo; | |
1265 | void *loc_cpu_entry; | |
72b2b1dd | 1266 | struct ipt_entry *iter; |
2722971c DM |
1267 | |
1268 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1269 | return -EFAULT; | |
1270 | ||
2722971c | 1271 | /* overflow check */ |
2722971c DM |
1272 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1273 | return -ENOMEM; | |
1086bbe9 DJ |
1274 | if (tmp.num_counters == 0) |
1275 | return -EINVAL; | |
1276 | ||
78b79876 | 1277 | tmp.name[sizeof(tmp.name)-1] = 0; |
2722971c DM |
1278 | |
1279 | newinfo = xt_alloc_table_info(tmp.size); | |
1280 | if (!newinfo) | |
1281 | return -ENOMEM; | |
1282 | ||
482cfc31 | 1283 | loc_cpu_entry = newinfo->entries; |
2722971c DM |
1284 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1285 | tmp.size) != 0) { | |
1286 | ret = -EFAULT; | |
1287 | goto free_newinfo; | |
1288 | } | |
1289 | ||
0f234214 | 1290 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
2722971c DM |
1291 | if (ret != 0) |
1292 | goto free_newinfo; | |
1293 | ||
ff67e4e4 | 1294 | duprintf("Translated table\n"); |
2722971c | 1295 | |
34bd137b | 1296 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1297 | tmp.num_counters, tmp.counters); |
2722971c DM |
1298 | if (ret) |
1299 | goto free_newinfo_untrans; | |
1300 | return 0; | |
1301 | ||
1302 | free_newinfo_untrans: | |
72b2b1dd | 1303 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1304 | cleanup_entry(iter, net); |
2722971c DM |
1305 | free_newinfo: |
1306 | xt_free_table_info(newinfo); | |
1307 | return ret; | |
1308 | } | |
1309 | ||
2722971c | 1310 | static int |
d5d1baa1 | 1311 | do_add_counters(struct net *net, const void __user *user, |
6c28255b | 1312 | unsigned int len, int compat) |
2722971c | 1313 | { |
482cfc31 | 1314 | unsigned int i; |
2722971c DM |
1315 | struct xt_counters_info tmp; |
1316 | struct xt_counters *paddc; | |
1317 | unsigned int num_counters; | |
5452e425 | 1318 | const char *name; |
2722971c DM |
1319 | int size; |
1320 | void *ptmp; | |
e60a13e0 | 1321 | struct xt_table *t; |
5452e425 | 1322 | const struct xt_table_info *private; |
2722971c | 1323 | int ret = 0; |
72b2b1dd | 1324 | struct ipt_entry *iter; |
7f5c6d4f | 1325 | unsigned int addend; |
2722971c DM |
1326 | #ifdef CONFIG_COMPAT |
1327 | struct compat_xt_counters_info compat_tmp; | |
1328 | ||
1329 | if (compat) { | |
1330 | ptmp = &compat_tmp; | |
1331 | size = sizeof(struct compat_xt_counters_info); | |
1332 | } else | |
1333 | #endif | |
1334 | { | |
1335 | ptmp = &tmp; | |
1336 | size = sizeof(struct xt_counters_info); | |
1337 | } | |
1338 | ||
1339 | if (copy_from_user(ptmp, user, size) != 0) | |
1340 | return -EFAULT; | |
1341 | ||
1342 | #ifdef CONFIG_COMPAT | |
1343 | if (compat) { | |
1344 | num_counters = compat_tmp.num_counters; | |
1345 | name = compat_tmp.name; | |
1346 | } else | |
1347 | #endif | |
1348 | { | |
1349 | num_counters = tmp.num_counters; | |
1350 | name = tmp.name; | |
1351 | } | |
1352 | ||
1353 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1354 | return -EINVAL; | |
1355 | ||
e12f8e29 | 1356 | paddc = vmalloc(len - size); |
2722971c DM |
1357 | if (!paddc) |
1358 | return -ENOMEM; | |
1359 | ||
1360 | if (copy_from_user(paddc, user + size, len - size) != 0) { | |
1361 | ret = -EFAULT; | |
1362 | goto free; | |
1363 | } | |
1364 | ||
34bd137b | 1365 | t = xt_find_table_lock(net, AF_INET, name); |
0cc8d8df | 1366 | if (IS_ERR_OR_NULL(t)) { |
2722971c DM |
1367 | ret = t ? PTR_ERR(t) : -ENOENT; |
1368 | goto free; | |
1369 | } | |
1370 | ||
942e4a2b | 1371 | local_bh_disable(); |
2722971c DM |
1372 | private = t->private; |
1373 | if (private->number != num_counters) { | |
1374 | ret = -EINVAL; | |
1375 | goto unlock_up_free; | |
1376 | } | |
1377 | ||
1378 | i = 0; | |
7f5c6d4f | 1379 | addend = xt_write_recseq_begin(); |
482cfc31 | 1380 | xt_entry_foreach(iter, private->entries, private->size) { |
71ae0dff FW |
1381 | struct xt_counters *tmp; |
1382 | ||
1383 | tmp = xt_get_this_cpu_counter(&iter->counters); | |
1384 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); | |
0559518b JE |
1385 | ++i; |
1386 | } | |
7f5c6d4f | 1387 | xt_write_recseq_end(addend); |
2722971c | 1388 | unlock_up_free: |
942e4a2b | 1389 | local_bh_enable(); |
2722971c DM |
1390 | xt_table_unlock(t); |
1391 | module_put(t->me); | |
1392 | free: | |
1393 | vfree(paddc); | |
1394 | ||
1395 | return ret; | |
1396 | } | |
1397 | ||
1398 | #ifdef CONFIG_COMPAT | |
1399 | struct compat_ipt_replace { | |
12b00c2c | 1400 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1401 | u32 valid_hooks; |
1402 | u32 num_entries; | |
1403 | u32 size; | |
6e23ae2a PM |
1404 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1405 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c | 1406 | u32 num_counters; |
87a2e70d | 1407 | compat_uptr_t counters; /* struct xt_counters * */ |
2722971c DM |
1408 | struct compat_ipt_entry entries[0]; |
1409 | }; | |
1410 | ||
a18aa31b PM |
1411 | static int |
1412 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1413 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1414 | unsigned int i) |
2722971c | 1415 | { |
87a2e70d | 1416 | struct xt_entry_target *t; |
2722971c DM |
1417 | struct compat_ipt_entry __user *ce; |
1418 | u_int16_t target_offset, next_offset; | |
1419 | compat_uint_t origsize; | |
dcea992a JE |
1420 | const struct xt_entry_match *ematch; |
1421 | int ret = 0; | |
2722971c | 1422 | |
2722971c DM |
1423 | origsize = *size; |
1424 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
0559518b JE |
1425 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
1426 | copy_to_user(&ce->counters, &counters[i], | |
1427 | sizeof(counters[i])) != 0) | |
1428 | return -EFAULT; | |
a18aa31b | 1429 | |
2722971c | 1430 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1431 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1432 | ||
dcea992a JE |
1433 | xt_ematch_foreach(ematch, e) { |
1434 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1435 | if (ret != 0) | |
6bdb331b | 1436 | return ret; |
dcea992a | 1437 | } |
2722971c | 1438 | target_offset = e->target_offset - (origsize - *size); |
2722971c | 1439 | t = ipt_get_target(e); |
9fa492cd | 1440 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c | 1441 | if (ret) |
0559518b | 1442 | return ret; |
2722971c | 1443 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1444 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1445 | put_user(next_offset, &ce->next_offset) != 0) | |
1446 | return -EFAULT; | |
2722971c | 1447 | return 0; |
2722971c DM |
1448 | } |
1449 | ||
022748a9 | 1450 | static int |
87a2e70d | 1451 | compat_find_calc_match(struct xt_entry_match *m, |
4b478248 PM |
1452 | const char *name, |
1453 | const struct ipt_ip *ip, | |
6bdb331b | 1454 | int *size) |
2722971c | 1455 | { |
6709dbbb | 1456 | struct xt_match *match; |
2722971c | 1457 | |
fd0ec0e6 JE |
1458 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
1459 | m->u.user.revision); | |
1460 | if (IS_ERR(match)) { | |
2722971c | 1461 | duprintf("compat_check_calc_match: `%s' not found\n", |
4b478248 | 1462 | m->u.user.name); |
fd0ec0e6 | 1463 | return PTR_ERR(match); |
2722971c DM |
1464 | } |
1465 | m->u.kernel.match = match; | |
9fa492cd | 1466 | *size += xt_compat_match_offset(match); |
4c1b52bc DM |
1467 | return 0; |
1468 | } | |
1469 | ||
0559518b | 1470 | static void compat_release_entry(struct compat_ipt_entry *e) |
4c1b52bc | 1471 | { |
87a2e70d | 1472 | struct xt_entry_target *t; |
dcea992a | 1473 | struct xt_entry_match *ematch; |
4c1b52bc | 1474 | |
4c1b52bc | 1475 | /* Cleanup all matches */ |
dcea992a | 1476 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1477 | module_put(ematch->u.kernel.match->me); |
73cd598d | 1478 | t = compat_ipt_get_target(e); |
4c1b52bc | 1479 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1480 | } |
1481 | ||
022748a9 | 1482 | static int |
73cd598d | 1483 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1484 | struct xt_table_info *newinfo, |
1485 | unsigned int *size, | |
d5d1baa1 JE |
1486 | const unsigned char *base, |
1487 | const unsigned char *limit, | |
1488 | const unsigned int *hook_entries, | |
1489 | const unsigned int *underflows, | |
4b478248 | 1490 | const char *name) |
2722971c | 1491 | { |
dcea992a | 1492 | struct xt_entry_match *ematch; |
87a2e70d | 1493 | struct xt_entry_target *t; |
6709dbbb | 1494 | struct xt_target *target; |
e5b5ef7d | 1495 | unsigned int entry_offset; |
b0a6363c PM |
1496 | unsigned int j; |
1497 | int ret, off, h; | |
2722971c DM |
1498 | |
1499 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c | 1500 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
6e94e0cf FW |
1501 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit || |
1502 | (unsigned char *)e + e->next_offset > limit) { | |
2722971c DM |
1503 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1504 | return -EINVAL; | |
1505 | } | |
1506 | ||
1507 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
4b478248 | 1508 | sizeof(struct compat_xt_entry_target)) { |
2722971c DM |
1509 | duprintf("checking: element %p size %u\n", |
1510 | e, e->next_offset); | |
1511 | return -EINVAL; | |
1512 | } | |
1513 | ||
aa412ba2 FW |
1514 | if (!ip_checkentry(&e->ip)) |
1515 | return -EINVAL; | |
1516 | ||
ce683e5f | 1517 | ret = xt_compat_check_entry_offsets(e, e->elems, |
fc1221b3 | 1518 | e->target_offset, e->next_offset); |
a96be246 DM |
1519 | if (ret) |
1520 | return ret; | |
590bdf7f | 1521 | |
30c08c41 | 1522 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1523 | entry_offset = (void *)e - (void *)base; |
1524 | j = 0; | |
dcea992a | 1525 | xt_ematch_foreach(ematch, e) { |
2f06550b | 1526 | ret = compat_find_calc_match(ematch, name, &e->ip, &off); |
dcea992a | 1527 | if (ret != 0) |
6bdb331b JE |
1528 | goto release_matches; |
1529 | ++j; | |
dcea992a | 1530 | } |
2722971c | 1531 | |
73cd598d | 1532 | t = compat_ipt_get_target(e); |
d2a7b6ba JE |
1533 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
1534 | t->u.user.revision); | |
1535 | if (IS_ERR(target)) { | |
a96be246 | 1536 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
4b478248 | 1537 | t->u.user.name); |
d2a7b6ba | 1538 | ret = PTR_ERR(target); |
4c1b52bc | 1539 | goto release_matches; |
2722971c DM |
1540 | } |
1541 | t->u.kernel.target = target; | |
1542 | ||
9fa492cd | 1543 | off += xt_compat_target_offset(target); |
2722971c | 1544 | *size += off; |
b386d9f5 | 1545 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1546 | if (ret) |
1547 | goto out; | |
1548 | ||
1549 | /* Check hooks & underflows */ | |
6e23ae2a | 1550 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1551 | if ((unsigned char *)e - base == hook_entries[h]) |
1552 | newinfo->hook_entry[h] = hook_entries[h]; | |
1553 | if ((unsigned char *)e - base == underflows[h]) | |
1554 | newinfo->underflow[h] = underflows[h]; | |
1555 | } | |
1556 | ||
1557 | /* Clear counters and comefrom */ | |
73cd598d | 1558 | memset(&e->counters, 0, sizeof(e->counters)); |
2722971c | 1559 | e->comefrom = 0; |
2722971c | 1560 | return 0; |
bec71b16 | 1561 | |
2722971c | 1562 | out: |
bec71b16 | 1563 | module_put(t->u.kernel.target->me); |
4c1b52bc | 1564 | release_matches: |
6bdb331b JE |
1565 | xt_ematch_foreach(ematch, e) { |
1566 | if (j-- == 0) | |
dcea992a | 1567 | break; |
6bdb331b JE |
1568 | module_put(ematch->u.kernel.match->me); |
1569 | } | |
2722971c DM |
1570 | return ret; |
1571 | } | |
1572 | ||
4b478248 | 1573 | static int |
73cd598d | 1574 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
4b478248 PM |
1575 | unsigned int *size, const char *name, |
1576 | struct xt_table_info *newinfo, unsigned char *base) | |
2722971c | 1577 | { |
87a2e70d | 1578 | struct xt_entry_target *t; |
6709dbbb | 1579 | struct xt_target *target; |
2722971c DM |
1580 | struct ipt_entry *de; |
1581 | unsigned int origsize; | |
920b868a | 1582 | int ret, h; |
dcea992a | 1583 | struct xt_entry_match *ematch; |
2722971c DM |
1584 | |
1585 | ret = 0; | |
1586 | origsize = *size; | |
1587 | de = (struct ipt_entry *)*dstptr; | |
1588 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1589 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1590 | |
73cd598d | 1591 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1592 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1593 | ||
dcea992a JE |
1594 | xt_ematch_foreach(ematch, e) { |
1595 | ret = xt_compat_match_from_user(ematch, dstptr, size); | |
1596 | if (ret != 0) | |
6bdb331b | 1597 | return ret; |
dcea992a | 1598 | } |
2722971c | 1599 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1600 | t = compat_ipt_get_target(e); |
2722971c | 1601 | target = t->u.kernel.target; |
9fa492cd | 1602 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1603 | |
1604 | de->next_offset = e->next_offset - (origsize - *size); | |
6e23ae2a | 1605 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1606 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1607 | newinfo->hook_entry[h] -= origsize - *size; | |
1608 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1609 | newinfo->underflow[h] -= origsize - *size; | |
1610 | } | |
f6677f43 DM |
1611 | return ret; |
1612 | } | |
1613 | ||
022748a9 | 1614 | static int |
0559518b | 1615 | compat_check_entry(struct ipt_entry *e, struct net *net, const char *name) |
f6677f43 | 1616 | { |
dcea992a | 1617 | struct xt_entry_match *ematch; |
9b4fce7a | 1618 | struct xt_mtchk_param mtpar; |
b0a6363c | 1619 | unsigned int j; |
dcea992a | 1620 | int ret = 0; |
f6677f43 | 1621 | |
71ae0dff FW |
1622 | e->counters.pcnt = xt_percpu_counter_alloc(); |
1623 | if (IS_ERR_VALUE(e->counters.pcnt)) | |
1624 | return -ENOMEM; | |
1625 | ||
4c1b52bc | 1626 | j = 0; |
a83d8e8d | 1627 | mtpar.net = net; |
9b4fce7a JE |
1628 | mtpar.table = name; |
1629 | mtpar.entryinfo = &e->ip; | |
1630 | mtpar.hook_mask = e->comefrom; | |
916a917d | 1631 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 1632 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 1633 | ret = check_match(ematch, &mtpar); |
dcea992a | 1634 | if (ret != 0) |
6bdb331b JE |
1635 | goto cleanup_matches; |
1636 | ++j; | |
dcea992a | 1637 | } |
4c1b52bc | 1638 | |
add67461 | 1639 | ret = check_target(e, net, name); |
4c1b52bc DM |
1640 | if (ret) |
1641 | goto cleanup_matches; | |
4c1b52bc DM |
1642 | return 0; |
1643 | ||
1644 | cleanup_matches: | |
6bdb331b JE |
1645 | xt_ematch_foreach(ematch, e) { |
1646 | if (j-- == 0) | |
dcea992a | 1647 | break; |
6bdb331b JE |
1648 | cleanup_match(ematch, net); |
1649 | } | |
71ae0dff FW |
1650 | |
1651 | xt_percpu_counter_free(e->counters.pcnt); | |
1652 | ||
4c1b52bc | 1653 | return ret; |
f6677f43 DM |
1654 | } |
1655 | ||
1da177e4 | 1656 | static int |
a83d8e8d AD |
1657 | translate_compat_table(struct net *net, |
1658 | const char *name, | |
4b478248 PM |
1659 | unsigned int valid_hooks, |
1660 | struct xt_table_info **pinfo, | |
1661 | void **pentry0, | |
1662 | unsigned int total_size, | |
1663 | unsigned int number, | |
1664 | unsigned int *hook_entries, | |
1665 | unsigned int *underflows) | |
1da177e4 | 1666 | { |
920b868a | 1667 | unsigned int i, j; |
2722971c DM |
1668 | struct xt_table_info *newinfo, *info; |
1669 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1670 | struct compat_ipt_entry *iter0; |
1671 | struct ipt_entry *iter1; | |
2722971c | 1672 | unsigned int size; |
0559518b | 1673 | int ret; |
1da177e4 | 1674 | |
2722971c DM |
1675 | info = *pinfo; |
1676 | entry0 = *pentry0; | |
1677 | size = total_size; | |
1678 | info->number = number; | |
1679 | ||
1680 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 1681 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1682 | info->hook_entry[i] = 0xFFFFFFFF; |
1683 | info->underflow[i] = 0xFFFFFFFF; | |
1684 | } | |
1685 | ||
1686 | duprintf("translate_compat_table: size %u\n", info->size); | |
920b868a | 1687 | j = 0; |
2722971c | 1688 | xt_compat_lock(AF_INET); |
255d0dc3 | 1689 | xt_compat_init_offsets(AF_INET, number); |
2722971c | 1690 | /* Walk through entries, checking offsets. */ |
72b2b1dd JE |
1691 | xt_entry_foreach(iter0, entry0, total_size) { |
1692 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1693 | entry0, |
1694 | entry0 + total_size, | |
1695 | hook_entries, | |
1696 | underflows, | |
1697 | name); | |
72b2b1dd | 1698 | if (ret != 0) |
0559518b JE |
1699 | goto out_unlock; |
1700 | ++j; | |
72b2b1dd | 1701 | } |
2722971c DM |
1702 | |
1703 | ret = -EINVAL; | |
920b868a | 1704 | if (j != number) { |
2722971c | 1705 | duprintf("translate_compat_table: %u not %u entries\n", |
920b868a | 1706 | j, number); |
2722971c DM |
1707 | goto out_unlock; |
1708 | } | |
1709 | ||
1710 | /* Check hooks all assigned */ | |
6e23ae2a | 1711 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1712 | /* Only hooks which are valid */ |
1713 | if (!(valid_hooks & (1 << i))) | |
1714 | continue; | |
1715 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1716 | duprintf("Invalid hook entry %u %u\n", | |
1717 | i, hook_entries[i]); | |
1718 | goto out_unlock; | |
1da177e4 | 1719 | } |
2722971c DM |
1720 | if (info->underflow[i] == 0xFFFFFFFF) { |
1721 | duprintf("Invalid underflow %u %u\n", | |
1722 | i, underflows[i]); | |
1723 | goto out_unlock; | |
1724 | } | |
1725 | } | |
1726 | ||
1727 | ret = -ENOMEM; | |
1728 | newinfo = xt_alloc_table_info(size); | |
1729 | if (!newinfo) | |
1730 | goto out_unlock; | |
1731 | ||
1732 | newinfo->number = number; | |
6e23ae2a | 1733 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
2722971c DM |
1734 | newinfo->hook_entry[i] = info->hook_entry[i]; |
1735 | newinfo->underflow[i] = info->underflow[i]; | |
1736 | } | |
482cfc31 | 1737 | entry1 = newinfo->entries; |
2722971c | 1738 | pos = entry1; |
4b478248 | 1739 | size = total_size; |
72b2b1dd | 1740 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1741 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1742 | name, newinfo, entry1); | |
72b2b1dd JE |
1743 | if (ret != 0) |
1744 | break; | |
1745 | } | |
b386d9f5 | 1746 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1747 | xt_compat_unlock(AF_INET); |
1748 | if (ret) | |
1749 | goto free_newinfo; | |
1750 | ||
1751 | ret = -ELOOP; | |
1752 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1753 | goto free_newinfo; | |
1754 | ||
4c1b52bc | 1755 | i = 0; |
72b2b1dd | 1756 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
0559518b | 1757 | ret = compat_check_entry(iter1, net, name); |
72b2b1dd JE |
1758 | if (ret != 0) |
1759 | break; | |
0559518b | 1760 | ++i; |
98dbbfc3 FW |
1761 | if (strcmp(ipt_get_target(iter1)->u.user.name, |
1762 | XT_ERROR_TARGET) == 0) | |
1763 | ++newinfo->stacksize; | |
72b2b1dd | 1764 | } |
4c1b52bc | 1765 | if (ret) { |
72b2b1dd JE |
1766 | /* |
1767 | * The first i matches need cleanup_entry (calls ->destroy) | |
1768 | * because they had called ->check already. The other j-i | |
1769 | * entries need only release. | |
1770 | */ | |
1771 | int skip = i; | |
4c1b52bc | 1772 | j -= i; |
72b2b1dd JE |
1773 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1774 | if (skip-- > 0) | |
1775 | continue; | |
0559518b | 1776 | if (j-- == 0) |
72b2b1dd | 1777 | break; |
0559518b | 1778 | compat_release_entry(iter0); |
72b2b1dd | 1779 | } |
0559518b JE |
1780 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1781 | if (i-- == 0) | |
72b2b1dd | 1782 | break; |
0559518b JE |
1783 | cleanup_entry(iter1, net); |
1784 | } | |
4c1b52bc DM |
1785 | xt_free_table_info(newinfo); |
1786 | return ret; | |
1787 | } | |
f6677f43 | 1788 | |
2722971c DM |
1789 | *pinfo = newinfo; |
1790 | *pentry0 = entry1; | |
1791 | xt_free_table_info(info); | |
1792 | return 0; | |
1da177e4 | 1793 | |
2722971c DM |
1794 | free_newinfo: |
1795 | xt_free_table_info(newinfo); | |
1796 | out: | |
0559518b JE |
1797 | xt_entry_foreach(iter0, entry0, total_size) { |
1798 | if (j-- == 0) | |
72b2b1dd | 1799 | break; |
0559518b JE |
1800 | compat_release_entry(iter0); |
1801 | } | |
1da177e4 | 1802 | return ret; |
2722971c | 1803 | out_unlock: |
b386d9f5 | 1804 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1805 | xt_compat_unlock(AF_INET); |
1806 | goto out; | |
1da177e4 LT |
1807 | } |
1808 | ||
1809 | static int | |
34bd137b | 1810 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1811 | { |
1812 | int ret; | |
2722971c DM |
1813 | struct compat_ipt_replace tmp; |
1814 | struct xt_table_info *newinfo; | |
1815 | void *loc_cpu_entry; | |
72b2b1dd | 1816 | struct ipt_entry *iter; |
1da177e4 LT |
1817 | |
1818 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1819 | return -EFAULT; | |
1820 | ||
ee4bb818 | 1821 | /* overflow check */ |
259d4e41 | 1822 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
ee4bb818 KK |
1823 | return -ENOMEM; |
1824 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1825 | return -ENOMEM; | |
1086bbe9 DJ |
1826 | if (tmp.num_counters == 0) |
1827 | return -EINVAL; | |
1828 | ||
78b79876 | 1829 | tmp.name[sizeof(tmp.name)-1] = 0; |
ee4bb818 | 1830 | |
2e4e6a17 | 1831 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1832 | if (!newinfo) |
1833 | return -ENOMEM; | |
1834 | ||
482cfc31 | 1835 | loc_cpu_entry = newinfo->entries; |
31836064 | 1836 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1da177e4 LT |
1837 | tmp.size) != 0) { |
1838 | ret = -EFAULT; | |
1839 | goto free_newinfo; | |
1840 | } | |
1841 | ||
a83d8e8d | 1842 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
4b478248 PM |
1843 | &newinfo, &loc_cpu_entry, tmp.size, |
1844 | tmp.num_entries, tmp.hook_entry, | |
1845 | tmp.underflow); | |
2722971c | 1846 | if (ret != 0) |
1da177e4 | 1847 | goto free_newinfo; |
1da177e4 | 1848 | |
2722971c | 1849 | duprintf("compat_do_replace: Translated table\n"); |
1da177e4 | 1850 | |
34bd137b | 1851 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1852 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1853 | if (ret) |
1854 | goto free_newinfo_untrans; | |
1855 | return 0; | |
1da177e4 | 1856 | |
2722971c | 1857 | free_newinfo_untrans: |
72b2b1dd | 1858 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1859 | cleanup_entry(iter, net); |
2722971c DM |
1860 | free_newinfo: |
1861 | xt_free_table_info(newinfo); | |
1862 | return ret; | |
1863 | } | |
1da177e4 | 1864 | |
2722971c DM |
1865 | static int |
1866 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1867 | unsigned int len) |
2722971c DM |
1868 | { |
1869 | int ret; | |
1da177e4 | 1870 | |
52e804c6 | 1871 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
2722971c | 1872 | return -EPERM; |
1da177e4 | 1873 | |
2722971c DM |
1874 | switch (cmd) { |
1875 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1876 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1877 | break; |
1da177e4 | 1878 | |
2722971c | 1879 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1880 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1881 | break; |
1882 | ||
1883 | default: | |
1884 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
1885 | ret = -EINVAL; | |
1886 | } | |
1da177e4 | 1887 | |
1da177e4 LT |
1888 | return ret; |
1889 | } | |
1890 | ||
4b478248 | 1891 | struct compat_ipt_get_entries { |
12b00c2c | 1892 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1893 | compat_uint_t size; |
1894 | struct compat_ipt_entry entrytable[0]; | |
1895 | }; | |
1da177e4 | 1896 | |
4b478248 PM |
1897 | static int |
1898 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1899 | void __user *userptr) | |
2722971c | 1900 | { |
2722971c | 1901 | struct xt_counters *counters; |
5452e425 | 1902 | const struct xt_table_info *private = table->private; |
2722971c DM |
1903 | void __user *pos; |
1904 | unsigned int size; | |
1905 | int ret = 0; | |
a18aa31b | 1906 | unsigned int i = 0; |
72b2b1dd | 1907 | struct ipt_entry *iter; |
1da177e4 | 1908 | |
2722971c DM |
1909 | counters = alloc_counters(table); |
1910 | if (IS_ERR(counters)) | |
1911 | return PTR_ERR(counters); | |
1912 | ||
2722971c DM |
1913 | pos = userptr; |
1914 | size = total_size; | |
482cfc31 | 1915 | xt_entry_foreach(iter, private->entries, total_size) { |
72b2b1dd | 1916 | ret = compat_copy_entry_to_user(iter, &pos, |
6b4ff2d7 | 1917 | &size, counters, i++); |
72b2b1dd JE |
1918 | if (ret != 0) |
1919 | break; | |
1920 | } | |
2722971c | 1921 | |
2722971c DM |
1922 | vfree(counters); |
1923 | return ret; | |
1da177e4 LT |
1924 | } |
1925 | ||
1926 | static int | |
34bd137b AD |
1927 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1928 | int *len) | |
1da177e4 | 1929 | { |
2722971c DM |
1930 | int ret; |
1931 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1932 | struct xt_table *t; |
1da177e4 | 1933 | |
2722971c | 1934 | if (*len < sizeof(get)) { |
c9d8fe13 | 1935 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
1da177e4 | 1936 | return -EINVAL; |
2722971c | 1937 | } |
1da177e4 | 1938 | |
2722971c DM |
1939 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1940 | return -EFAULT; | |
1da177e4 | 1941 | |
2722971c | 1942 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
c9d8fe13 PM |
1943 | duprintf("compat_get_entries: %u != %zu\n", |
1944 | *len, sizeof(get) + get.size); | |
2722971c | 1945 | return -EINVAL; |
1da177e4 | 1946 | } |
b301f253 | 1947 | get.name[sizeof(get.name) - 1] = '\0'; |
1da177e4 | 1948 | |
2722971c | 1949 | xt_compat_lock(AF_INET); |
34bd137b | 1950 | t = xt_find_table_lock(net, AF_INET, get.name); |
0cc8d8df | 1951 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1952 | const struct xt_table_info *private = t->private; |
2722971c | 1953 | struct xt_table_info info; |
9c547959 | 1954 | duprintf("t->private->number = %u\n", private->number); |
2722971c DM |
1955 | ret = compat_table_info(private, &info); |
1956 | if (!ret && get.size == info.size) { | |
1957 | ret = compat_copy_entries_to_user(private->size, | |
4b478248 | 1958 | t, uptr->entrytable); |
2722971c DM |
1959 | } else if (!ret) { |
1960 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
9c547959 | 1961 | private->size, get.size); |
544473c1 | 1962 | ret = -EAGAIN; |
2722971c | 1963 | } |
b386d9f5 | 1964 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1965 | module_put(t->me); |
1966 | xt_table_unlock(t); | |
1967 | } else | |
1da177e4 | 1968 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1969 | |
2722971c DM |
1970 | xt_compat_unlock(AF_INET); |
1971 | return ret; | |
1972 | } | |
1da177e4 | 1973 | |
79030ed0 PM |
1974 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1975 | ||
2722971c DM |
1976 | static int |
1977 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1978 | { | |
1979 | int ret; | |
1da177e4 | 1980 | |
52e804c6 | 1981 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
82fac054 BS |
1982 | return -EPERM; |
1983 | ||
2722971c DM |
1984 | switch (cmd) { |
1985 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1986 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1987 | break; |
1988 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1989 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1990 | break; |
1991 | default: | |
79030ed0 | 1992 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1993 | } |
1da177e4 LT |
1994 | return ret; |
1995 | } | |
2722971c | 1996 | #endif |
1da177e4 LT |
1997 | |
1998 | static int | |
9c547959 | 1999 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
2000 | { |
2001 | int ret; | |
2002 | ||
52e804c6 | 2003 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2004 | return -EPERM; |
2005 | ||
2006 | switch (cmd) { | |
2007 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 2008 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
2009 | break; |
2010 | ||
2011 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 2012 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
2013 | break; |
2014 | ||
2015 | default: | |
2016 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); | |
2017 | ret = -EINVAL; | |
2018 | } | |
2019 | ||
2020 | return ret; | |
2021 | } | |
2022 | ||
2023 | static int | |
2024 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
2025 | { | |
2026 | int ret; | |
2027 | ||
52e804c6 | 2028 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2029 | return -EPERM; |
2030 | ||
2031 | switch (cmd) { | |
2722971c | 2032 | case IPT_SO_GET_INFO: |
3b1e0a65 | 2033 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 2034 | break; |
1da177e4 | 2035 | |
2722971c | 2036 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 2037 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 2038 | break; |
1da177e4 LT |
2039 | |
2040 | case IPT_SO_GET_REVISION_MATCH: | |
2041 | case IPT_SO_GET_REVISION_TARGET: { | |
12b00c2c | 2042 | struct xt_get_revision rev; |
2e4e6a17 | 2043 | int target; |
1da177e4 LT |
2044 | |
2045 | if (*len != sizeof(rev)) { | |
2046 | ret = -EINVAL; | |
2047 | break; | |
2048 | } | |
2049 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
2050 | ret = -EFAULT; | |
2051 | break; | |
2052 | } | |
78b79876 | 2053 | rev.name[sizeof(rev.name)-1] = 0; |
1da177e4 LT |
2054 | |
2055 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 2056 | target = 1; |
1da177e4 | 2057 | else |
2e4e6a17 | 2058 | target = 0; |
1da177e4 | 2059 | |
2e4e6a17 HW |
2060 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
2061 | rev.revision, | |
2062 | target, &ret), | |
1da177e4 LT |
2063 | "ipt_%s", rev.name); |
2064 | break; | |
2065 | } | |
2066 | ||
2067 | default: | |
2068 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); | |
2069 | ret = -EINVAL; | |
2070 | } | |
2071 | ||
2072 | return ret; | |
2073 | } | |
2074 | ||
b9e69e12 FW |
2075 | static void __ipt_unregister_table(struct net *net, struct xt_table *table) |
2076 | { | |
2077 | struct xt_table_info *private; | |
2078 | void *loc_cpu_entry; | |
2079 | struct module *table_owner = table->me; | |
2080 | struct ipt_entry *iter; | |
2081 | ||
2082 | private = xt_unregister_table(table); | |
2083 | ||
2084 | /* Decrease module usage counts and free resources */ | |
2085 | loc_cpu_entry = private->entries; | |
2086 | xt_entry_foreach(iter, loc_cpu_entry, private->size) | |
2087 | cleanup_entry(iter, net); | |
2088 | if (private->number > private->initial_entries) | |
2089 | module_put(table_owner); | |
2090 | xt_free_table_info(private); | |
2091 | } | |
2092 | ||
a67dd266 FW |
2093 | int ipt_register_table(struct net *net, const struct xt_table *table, |
2094 | const struct ipt_replace *repl, | |
2095 | const struct nf_hook_ops *ops, struct xt_table **res) | |
1da177e4 LT |
2096 | { |
2097 | int ret; | |
2e4e6a17 | 2098 | struct xt_table_info *newinfo; |
f3c5c1bf | 2099 | struct xt_table_info bootstrap = {0}; |
31836064 | 2100 | void *loc_cpu_entry; |
a98da11d | 2101 | struct xt_table *new_table; |
1da177e4 | 2102 | |
2e4e6a17 | 2103 | newinfo = xt_alloc_table_info(repl->size); |
a67dd266 FW |
2104 | if (!newinfo) |
2105 | return -ENOMEM; | |
1da177e4 | 2106 | |
482cfc31 | 2107 | loc_cpu_entry = newinfo->entries; |
31836064 | 2108 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
1da177e4 | 2109 | |
0f234214 | 2110 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
2111 | if (ret != 0) |
2112 | goto out_free; | |
1da177e4 | 2113 | |
44d34e72 | 2114 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 2115 | if (IS_ERR(new_table)) { |
44d34e72 AD |
2116 | ret = PTR_ERR(new_table); |
2117 | goto out_free; | |
1da177e4 LT |
2118 | } |
2119 | ||
b9e69e12 | 2120 | /* set res now, will see skbs right after nf_register_net_hooks */ |
a67dd266 | 2121 | WRITE_ONCE(*res, new_table); |
b9e69e12 FW |
2122 | |
2123 | ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks)); | |
2124 | if (ret != 0) { | |
2125 | __ipt_unregister_table(net, new_table); | |
2126 | *res = NULL; | |
2127 | } | |
2128 | ||
a67dd266 | 2129 | return ret; |
44d34e72 AD |
2130 | |
2131 | out_free: | |
2132 | xt_free_table_info(newinfo); | |
a67dd266 | 2133 | return ret; |
1da177e4 LT |
2134 | } |
2135 | ||
a67dd266 FW |
2136 | void ipt_unregister_table(struct net *net, struct xt_table *table, |
2137 | const struct nf_hook_ops *ops) | |
1da177e4 | 2138 | { |
b9e69e12 FW |
2139 | nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks)); |
2140 | __ipt_unregister_table(net, table); | |
1da177e4 LT |
2141 | } |
2142 | ||
2143 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 2144 | static inline bool |
1da177e4 LT |
2145 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
2146 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 2147 | bool invert) |
1da177e4 | 2148 | { |
9c547959 PM |
2149 | return ((test_type == 0xFF) || |
2150 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
2151 | ^ invert; |
2152 | } | |
2153 | ||
1d93a9cb | 2154 | static bool |
62fc8051 | 2155 | icmp_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 2156 | { |
5452e425 JE |
2157 | const struct icmphdr *ic; |
2158 | struct icmphdr _icmph; | |
f7108a20 | 2159 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
2160 | |
2161 | /* Must not be a fragment. */ | |
f7108a20 | 2162 | if (par->fragoff != 0) |
1d93a9cb | 2163 | return false; |
1da177e4 | 2164 | |
f7108a20 | 2165 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
2166 | if (ic == NULL) { |
2167 | /* We've been asked to examine this packet, and we | |
2168 | * can't. Hence, no choice but to drop. | |
2169 | */ | |
2170 | duprintf("Dropping evil ICMP tinygram.\n"); | |
b4ba2611 | 2171 | par->hotdrop = true; |
1d93a9cb | 2172 | return false; |
1da177e4 LT |
2173 | } |
2174 | ||
2175 | return icmp_type_code_match(icmpinfo->type, | |
2176 | icmpinfo->code[0], | |
2177 | icmpinfo->code[1], | |
2178 | ic->type, ic->code, | |
2179 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
2180 | } | |
2181 | ||
b0f38452 | 2182 | static int icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 2183 | { |
9b4fce7a | 2184 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 2185 | |
1d5cd909 | 2186 | /* Must specify no unknown invflags */ |
bd414ee6 | 2187 | return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
2188 | } |
2189 | ||
4538506b JE |
2190 | static struct xt_target ipt_builtin_tg[] __read_mostly = { |
2191 | { | |
243bf6e2 | 2192 | .name = XT_STANDARD_TARGET, |
4538506b JE |
2193 | .targetsize = sizeof(int), |
2194 | .family = NFPROTO_IPV4, | |
2722971c | 2195 | #ifdef CONFIG_COMPAT |
4538506b JE |
2196 | .compatsize = sizeof(compat_int_t), |
2197 | .compat_from_user = compat_standard_from_user, | |
2198 | .compat_to_user = compat_standard_to_user, | |
2722971c | 2199 | #endif |
4538506b JE |
2200 | }, |
2201 | { | |
243bf6e2 | 2202 | .name = XT_ERROR_TARGET, |
4538506b | 2203 | .target = ipt_error, |
12b00c2c | 2204 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
2205 | .family = NFPROTO_IPV4, |
2206 | }, | |
1da177e4 LT |
2207 | }; |
2208 | ||
2209 | static struct nf_sockopt_ops ipt_sockopts = { | |
2210 | .pf = PF_INET, | |
2211 | .set_optmin = IPT_BASE_CTL, | |
2212 | .set_optmax = IPT_SO_SET_MAX+1, | |
2213 | .set = do_ipt_set_ctl, | |
2722971c DM |
2214 | #ifdef CONFIG_COMPAT |
2215 | .compat_set = compat_do_ipt_set_ctl, | |
2216 | #endif | |
1da177e4 LT |
2217 | .get_optmin = IPT_BASE_CTL, |
2218 | .get_optmax = IPT_SO_GET_MAX+1, | |
2219 | .get = do_ipt_get_ctl, | |
2722971c DM |
2220 | #ifdef CONFIG_COMPAT |
2221 | .compat_get = compat_do_ipt_get_ctl, | |
2222 | #endif | |
16fcec35 | 2223 | .owner = THIS_MODULE, |
1da177e4 LT |
2224 | }; |
2225 | ||
4538506b JE |
2226 | static struct xt_match ipt_builtin_mt[] __read_mostly = { |
2227 | { | |
2228 | .name = "icmp", | |
2229 | .match = icmp_match, | |
2230 | .matchsize = sizeof(struct ipt_icmp), | |
2231 | .checkentry = icmp_checkentry, | |
2232 | .proto = IPPROTO_ICMP, | |
2233 | .family = NFPROTO_IPV4, | |
2234 | }, | |
1da177e4 LT |
2235 | }; |
2236 | ||
3cb609d5 AD |
2237 | static int __net_init ip_tables_net_init(struct net *net) |
2238 | { | |
383ca5b8 | 2239 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
2240 | } |
2241 | ||
2242 | static void __net_exit ip_tables_net_exit(struct net *net) | |
2243 | { | |
383ca5b8 | 2244 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
2245 | } |
2246 | ||
2247 | static struct pernet_operations ip_tables_net_ops = { | |
2248 | .init = ip_tables_net_init, | |
2249 | .exit = ip_tables_net_exit, | |
2250 | }; | |
2251 | ||
65b4b4e8 | 2252 | static int __init ip_tables_init(void) |
1da177e4 LT |
2253 | { |
2254 | int ret; | |
2255 | ||
3cb609d5 | 2256 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2257 | if (ret < 0) |
2258 | goto err1; | |
2e4e6a17 | 2259 | |
25985edc | 2260 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 2261 | ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 PM |
2262 | if (ret < 0) |
2263 | goto err2; | |
4538506b | 2264 | ret = xt_register_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 PM |
2265 | if (ret < 0) |
2266 | goto err4; | |
1da177e4 LT |
2267 | |
2268 | /* Register setsockopt */ | |
2269 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
2270 | if (ret < 0) |
2271 | goto err5; | |
1da177e4 | 2272 | |
ff67e4e4 | 2273 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 2274 | return 0; |
0eff66e6 PM |
2275 | |
2276 | err5: | |
4538506b | 2277 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 | 2278 | err4: |
4538506b | 2279 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 | 2280 | err2: |
3cb609d5 | 2281 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
2282 | err1: |
2283 | return ret; | |
1da177e4 LT |
2284 | } |
2285 | ||
65b4b4e8 | 2286 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
2287 | { |
2288 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 2289 | |
4538506b JE |
2290 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
2291 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); | |
3cb609d5 | 2292 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
2293 | } |
2294 | ||
2295 | EXPORT_SYMBOL(ipt_register_table); | |
2296 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 2297 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
2298 | module_init(ip_tables_init); |
2299 | module_exit(ip_tables_fini); |