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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> |
7c0f6ba6 | 23 | #include <linux/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 | ||
1da177e4 | 38 | #ifdef CONFIG_NETFILTER_DEBUG |
af567603 | 39 | #define IP_NF_ASSERT(x) WARN_ON(!(x)) |
1da177e4 LT |
40 | #else |
41 | #define IP_NF_ASSERT(x) | |
42 | #endif | |
1da177e4 | 43 | |
e3eaa991 JE |
44 | void *ipt_alloc_initial_table(const struct xt_table *info) |
45 | { | |
46 | return xt_alloc_initial_table(ipt, IPT); | |
47 | } | |
48 | EXPORT_SYMBOL_GPL(ipt_alloc_initial_table); | |
49 | ||
1da177e4 | 50 | /* Returns whether matches rule or not. */ |
022748a9 | 51 | /* Performance critical - called for every packet */ |
9c547959 | 52 | static inline bool |
1da177e4 LT |
53 | ip_packet_match(const struct iphdr *ip, |
54 | const char *indev, | |
55 | const char *outdev, | |
56 | const struct ipt_ip *ipinfo, | |
57 | int isfrag) | |
58 | { | |
1da177e4 LT |
59 | unsigned long ret; |
60 | ||
c37a2dfa JP |
61 | if (NF_INVF(ipinfo, IPT_INV_SRCIP, |
62 | (ip->saddr & ipinfo->smsk.s_addr) != ipinfo->src.s_addr) || | |
63 | NF_INVF(ipinfo, IPT_INV_DSTIP, | |
64 | (ip->daddr & ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr)) | |
9c547959 | 65 | return false; |
1da177e4 | 66 | |
b8dfe498 | 67 | ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask); |
1da177e4 | 68 | |
c37a2dfa | 69 | if (NF_INVF(ipinfo, IPT_INV_VIA_IN, ret != 0)) |
9c547959 | 70 | return false; |
1da177e4 | 71 | |
b8dfe498 | 72 | ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
1da177e4 | 73 | |
c37a2dfa | 74 | if (NF_INVF(ipinfo, IPT_INV_VIA_OUT, ret != 0)) |
9c547959 | 75 | return false; |
1da177e4 LT |
76 | |
77 | /* Check specific protocol */ | |
3666ed1c | 78 | if (ipinfo->proto && |
c37a2dfa | 79 | NF_INVF(ipinfo, IPT_INV_PROTO, ip->protocol != ipinfo->proto)) |
9c547959 | 80 | return false; |
1da177e4 LT |
81 | |
82 | /* If we have a fragment rule but the packet is not a fragment | |
83 | * then we return zero */ | |
c37a2dfa JP |
84 | if (NF_INVF(ipinfo, IPT_INV_FRAG, |
85 | (ipinfo->flags & IPT_F_FRAG) && !isfrag)) | |
9c547959 | 86 | return false; |
1da177e4 | 87 | |
9c547959 | 88 | return true; |
1da177e4 LT |
89 | } |
90 | ||
022748a9 | 91 | static bool |
1da177e4 LT |
92 | ip_checkentry(const struct ipt_ip *ip) |
93 | { | |
d7cdf816 | 94 | if (ip->flags & ~IPT_F_MASK) |
ccb79bdc | 95 | return false; |
d7cdf816 | 96 | if (ip->invflags & ~IPT_INV_MASK) |
ccb79bdc | 97 | return false; |
ccb79bdc | 98 | return true; |
1da177e4 LT |
99 | } |
100 | ||
101 | static unsigned int | |
4b560b44 | 102 | ipt_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 103 | { |
e87cc472 | 104 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
105 | |
106 | return NF_DROP; | |
107 | } | |
108 | ||
022748a9 | 109 | /* Performance critical */ |
1da177e4 | 110 | static inline struct ipt_entry * |
d5d1baa1 | 111 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
112 | { |
113 | return (struct ipt_entry *)(base + offset); | |
114 | } | |
115 | ||
ba9dda3a | 116 | /* All zeroes == unconditional rule. */ |
022748a9 | 117 | /* Mildly perf critical (only if packet tracing is on) */ |
54d83fc7 | 118 | static inline bool unconditional(const struct ipt_entry *e) |
ba9dda3a | 119 | { |
47901dc2 | 120 | static const struct ipt_ip uncond; |
ba9dda3a | 121 | |
54d83fc7 FW |
122 | return e->target_offset == sizeof(struct ipt_entry) && |
123 | memcmp(&e->ip, &uncond, sizeof(uncond)) == 0; | |
ba9dda3a JK |
124 | } |
125 | ||
d5d1baa1 | 126 | /* for const-correctness */ |
87a2e70d | 127 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
128 | ipt_get_target_c(const struct ipt_entry *e) |
129 | { | |
130 | return ipt_get_target((struct ipt_entry *)e); | |
131 | } | |
132 | ||
f0165888 | 133 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
022748a9 | 134 | static const char *const hooknames[] = { |
6e23ae2a PM |
135 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
136 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 137 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
138 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
139 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
140 | }; |
141 | ||
142 | enum nf_ip_trace_comments { | |
143 | NF_IP_TRACE_COMMENT_RULE, | |
144 | NF_IP_TRACE_COMMENT_RETURN, | |
145 | NF_IP_TRACE_COMMENT_POLICY, | |
146 | }; | |
147 | ||
022748a9 | 148 | static const char *const comments[] = { |
ba9dda3a JK |
149 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
150 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
151 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
152 | }; | |
153 | ||
154 | static struct nf_loginfo trace_loginfo = { | |
155 | .type = NF_LOG_TYPE_LOG, | |
156 | .u = { | |
157 | .log = { | |
158 | .level = 4, | |
ff107d27 | 159 | .logflags = NF_LOG_DEFAULT_MASK, |
ba9dda3a JK |
160 | }, |
161 | }, | |
162 | }; | |
163 | ||
022748a9 | 164 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 165 | static inline int |
d5d1baa1 | 166 | get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e, |
4f2f6f23 JE |
167 | const char *hookname, const char **chainname, |
168 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 169 | { |
87a2e70d | 170 | const struct xt_standard_target *t = (void *)ipt_get_target_c(s); |
ba9dda3a | 171 | |
243bf6e2 | 172 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
173 | /* Head of user chain: ERROR target with chainname */ |
174 | *chainname = t->target.data; | |
175 | (*rulenum) = 0; | |
176 | } else if (s == e) { | |
177 | (*rulenum)++; | |
178 | ||
54d83fc7 | 179 | if (unconditional(s) && |
3666ed1c | 180 | strcmp(t->target.u.kernel.target->name, |
243bf6e2 | 181 | XT_STANDARD_TARGET) == 0 && |
54d83fc7 | 182 | t->verdict < 0) { |
ba9dda3a JK |
183 | /* Tail of chains: STANDARD target (return/policy) */ |
184 | *comment = *chainname == hookname | |
4f2f6f23 JE |
185 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
186 | : comments[NF_IP_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
187 | } |
188 | return 1; | |
189 | } else | |
190 | (*rulenum)++; | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
9dff2c96 EB |
195 | static void trace_packet(struct net *net, |
196 | const struct sk_buff *skb, | |
ba9dda3a JK |
197 | unsigned int hook, |
198 | const struct net_device *in, | |
199 | const struct net_device *out, | |
ecb6f85e | 200 | const char *tablename, |
d5d1baa1 JE |
201 | const struct xt_table_info *private, |
202 | const struct ipt_entry *e) | |
ba9dda3a | 203 | { |
5452e425 | 204 | const struct ipt_entry *root; |
4f2f6f23 | 205 | const char *hookname, *chainname, *comment; |
72b2b1dd | 206 | const struct ipt_entry *iter; |
ba9dda3a JK |
207 | unsigned int rulenum = 0; |
208 | ||
482cfc31 | 209 | root = get_entry(private->entries, private->hook_entry[hook]); |
ba9dda3a | 210 | |
4f2f6f23 JE |
211 | hookname = chainname = hooknames[hook]; |
212 | comment = comments[NF_IP_TRACE_COMMENT_RULE]; | |
ba9dda3a | 213 | |
72b2b1dd JE |
214 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
215 | if (get_chainname_rulenum(iter, e, hookname, | |
216 | &chainname, &comment, &rulenum) != 0) | |
217 | break; | |
ba9dda3a | 218 | |
4017a7ee PNA |
219 | nf_log_trace(net, AF_INET, hook, skb, in, out, &trace_loginfo, |
220 | "TRACE: %s:%s:%s:%u ", | |
221 | tablename, chainname, comment, rulenum); | |
ba9dda3a JK |
222 | } |
223 | #endif | |
224 | ||
6c7941de | 225 | static inline |
98e86403 JE |
226 | struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry) |
227 | { | |
228 | return (void *)entry + entry->next_offset; | |
229 | } | |
230 | ||
1da177e4 LT |
231 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
232 | unsigned int | |
3db05fea | 233 | ipt_do_table(struct sk_buff *skb, |
1c491ba2 | 234 | const struct nf_hook_state *state, |
e60a13e0 | 235 | struct xt_table *table) |
1da177e4 | 236 | { |
6cb8ff3f | 237 | unsigned int hook = state->hook; |
1da177e4 | 238 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
5452e425 | 239 | const struct iphdr *ip; |
1da177e4 LT |
240 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
241 | unsigned int verdict = NF_DROP; | |
242 | const char *indev, *outdev; | |
d5d1baa1 | 243 | const void *table_base; |
f3c5c1bf | 244 | struct ipt_entry *e, **jumpstack; |
7814b6ec | 245 | unsigned int stackidx, cpu; |
d5d1baa1 | 246 | const struct xt_table_info *private; |
de74c169 | 247 | struct xt_action_param acpar; |
7f5c6d4f | 248 | unsigned int addend; |
1da177e4 LT |
249 | |
250 | /* Initialization */ | |
7814b6ec | 251 | stackidx = 0; |
3db05fea | 252 | ip = ip_hdr(skb); |
1c491ba2 DM |
253 | indev = state->in ? state->in->name : nulldevname; |
254 | outdev = state->out ? state->out->name : nulldevname; | |
1da177e4 LT |
255 | /* We handle fragments by dealing with the first fragment as |
256 | * if it was a normal packet. All other fragments are treated | |
257 | * normally, except that they will NEVER match rules that ask | |
258 | * things we don't know, ie. tcp syn flag or ports). If the | |
259 | * rule is also a fragment-specific rule, non-fragments won't | |
260 | * match it. */ | |
de74c169 JE |
261 | acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
262 | acpar.thoff = ip_hdrlen(skb); | |
b4ba2611 | 263 | acpar.hotdrop = false; |
613dbd95 | 264 | acpar.state = state; |
1da177e4 | 265 | |
1da177e4 | 266 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
7f5c6d4f ED |
267 | local_bh_disable(); |
268 | addend = xt_write_recseq_begin(); | |
942e4a2b | 269 | private = table->private; |
f3c5c1bf | 270 | cpu = smp_processor_id(); |
b416c144 WD |
271 | /* |
272 | * Ensure we load private-> members after we've fetched the base | |
273 | * pointer. | |
274 | */ | |
275 | smp_read_barrier_depends(); | |
482cfc31 | 276 | table_base = private->entries; |
f3c5c1bf | 277 | jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; |
7814b6ec FW |
278 | |
279 | /* Switch to alternate jumpstack if we're being invoked via TEE. | |
280 | * TEE issues XT_CONTINUE verdict on original skb so we must not | |
281 | * clobber the jumpstack. | |
282 | * | |
283 | * For recursion via REJECT or SYNPROXY the stack will be clobbered | |
284 | * but it is no problem since absolute verdict is issued by these. | |
285 | */ | |
dcebd315 FW |
286 | if (static_key_false(&xt_tee_enabled)) |
287 | jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated); | |
78454473 | 288 | |
2e4e6a17 | 289 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 290 | |
1da177e4 | 291 | do { |
87a2e70d | 292 | const struct xt_entry_target *t; |
dcea992a | 293 | const struct xt_entry_match *ematch; |
71ae0dff | 294 | struct xt_counters *counter; |
a1ff4ac8 | 295 | |
1da177e4 | 296 | IP_NF_ASSERT(e); |
a1ff4ac8 | 297 | if (!ip_packet_match(ip, indev, outdev, |
de74c169 | 298 | &e->ip, acpar.fragoff)) { |
dcea992a | 299 | no_match: |
a1ff4ac8 JE |
300 | e = ipt_next_entry(e); |
301 | continue; | |
302 | } | |
1da177e4 | 303 | |
ef53d702 | 304 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
305 | acpar.match = ematch->u.kernel.match; |
306 | acpar.matchinfo = ematch->data; | |
307 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 308 | goto no_match; |
ef53d702 | 309 | } |
dcea992a | 310 | |
71ae0dff FW |
311 | counter = xt_get_this_cpu_counter(&e->counters); |
312 | ADD_COUNTER(*counter, skb->len, 1); | |
1da177e4 | 313 | |
a1ff4ac8 JE |
314 | t = ipt_get_target(e); |
315 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a | 316 | |
f0165888 | 317 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
318 | /* The packet is traced: log it */ |
319 | if (unlikely(skb->nf_trace)) | |
9dff2c96 EB |
320 | trace_packet(state->net, skb, hook, state->in, |
321 | state->out, table->name, private, e); | |
ba9dda3a | 322 | #endif |
a1ff4ac8 JE |
323 | /* Standard target? */ |
324 | if (!t->u.kernel.target->target) { | |
325 | int v; | |
326 | ||
87a2e70d | 327 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
328 | if (v < 0) { |
329 | /* Pop from stack? */ | |
243bf6e2 | 330 | if (v != XT_RETURN) { |
95c96174 | 331 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 332 | break; |
1da177e4 | 333 | } |
7814b6ec | 334 | if (stackidx == 0) { |
f3c5c1bf JE |
335 | e = get_entry(table_base, |
336 | private->underflow[hook]); | |
f3c5c1bf | 337 | } else { |
7814b6ec | 338 | e = jumpstack[--stackidx]; |
f3c5c1bf JE |
339 | e = ipt_next_entry(e); |
340 | } | |
a1ff4ac8 JE |
341 | continue; |
342 | } | |
3666ed1c | 343 | if (table_base + v != ipt_next_entry(e) && |
d7cdf816 | 344 | !(e->ip.flags & IPT_F_GOTO)) |
7814b6ec | 345 | jumpstack[stackidx++] = e; |
1da177e4 | 346 | |
a1ff4ac8 | 347 | e = get_entry(table_base, v); |
7a6b1c46 JE |
348 | continue; |
349 | } | |
350 | ||
de74c169 JE |
351 | acpar.target = t->u.kernel.target; |
352 | acpar.targinfo = t->data; | |
bb70dfa5 | 353 | |
de74c169 | 354 | verdict = t->u.kernel.target->target(skb, &acpar); |
7a6b1c46 JE |
355 | /* Target might have changed stuff. */ |
356 | ip = ip_hdr(skb); | |
243bf6e2 | 357 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
358 | e = ipt_next_entry(e); |
359 | else | |
360 | /* Verdict */ | |
361 | break; | |
b4ba2611 | 362 | } while (!acpar.hotdrop); |
7814b6ec | 363 | |
24cebe3f IM |
364 | xt_write_recseq_end(addend); |
365 | local_bh_enable(); | |
7f5c6d4f | 366 | |
b4ba2611 | 367 | if (acpar.hotdrop) |
1da177e4 LT |
368 | return NF_DROP; |
369 | else return verdict; | |
1da177e4 LT |
370 | } |
371 | ||
1da177e4 | 372 | /* Figures out from what hook each rule can be called: returns 0 if |
98dbbfc3 | 373 | there are loops. Puts hook bitmask in comefrom. */ |
1da177e4 | 374 | static int |
98dbbfc3 | 375 | mark_source_chains(const struct xt_table_info *newinfo, |
f4dc7771 FW |
376 | unsigned int valid_hooks, void *entry0, |
377 | unsigned int *offsets) | |
1da177e4 LT |
378 | { |
379 | unsigned int hook; | |
380 | ||
381 | /* No recursion; use packet counter to save back ptrs (reset | |
382 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 383 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 384 | unsigned int pos = newinfo->hook_entry[hook]; |
68ad546a | 385 | struct ipt_entry *e = entry0 + pos; |
1da177e4 LT |
386 | |
387 | if (!(valid_hooks & (1 << hook))) | |
388 | continue; | |
389 | ||
390 | /* Set initial back pointer. */ | |
391 | e->counters.pcnt = pos; | |
392 | ||
393 | for (;;) { | |
87a2e70d | 394 | const struct xt_standard_target *t |
d5d1baa1 | 395 | = (void *)ipt_get_target_c(e); |
e1b4b9f3 | 396 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 397 | |
d7cdf816 | 398 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) |
1da177e4 | 399 | return 0; |
d7cdf816 | 400 | |
9c547959 | 401 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
402 | |
403 | /* Unconditional return/END. */ | |
54d83fc7 | 404 | if ((unconditional(e) && |
3666ed1c | 405 | (strcmp(t->target.u.user.name, |
243bf6e2 | 406 | XT_STANDARD_TARGET) == 0) && |
54d83fc7 | 407 | t->verdict < 0) || visited) { |
1da177e4 LT |
408 | unsigned int oldpos, size; |
409 | ||
1f9352ae | 410 | if ((strcmp(t->target.u.user.name, |
24cebe3f | 411 | XT_STANDARD_TARGET) == 0) && |
d7cdf816 | 412 | t->verdict < -NF_MAX_VERDICT - 1) |
74c9c0c1 | 413 | return 0; |
74c9c0c1 | 414 | |
1da177e4 LT |
415 | /* Return: backtrack through the last |
416 | big jump. */ | |
417 | do { | |
6e23ae2a | 418 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
419 | oldpos = pos; |
420 | pos = e->counters.pcnt; | |
421 | e->counters.pcnt = 0; | |
422 | ||
423 | /* We're at the start. */ | |
424 | if (pos == oldpos) | |
425 | goto next; | |
426 | ||
68ad546a | 427 | e = entry0 + pos; |
1da177e4 LT |
428 | } while (oldpos == pos + e->next_offset); |
429 | ||
430 | /* Move along one */ | |
431 | size = e->next_offset; | |
68ad546a | 432 | e = entry0 + pos + size; |
f24e230d FW |
433 | if (pos + size >= newinfo->size) |
434 | return 0; | |
1da177e4 LT |
435 | e->counters.pcnt = pos; |
436 | pos += size; | |
437 | } else { | |
438 | int newpos = t->verdict; | |
439 | ||
440 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 441 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 442 | newpos >= 0) { |
1da177e4 | 443 | /* This a jump; chase it. */ |
f4dc7771 FW |
444 | if (!xt_find_jump_offset(offsets, newpos, |
445 | newinfo->number)) | |
446 | return 0; | |
68ad546a | 447 | e = entry0 + newpos; |
1da177e4 LT |
448 | } else { |
449 | /* ... this is a fallthru */ | |
450 | newpos = pos + e->next_offset; | |
f24e230d FW |
451 | if (newpos >= newinfo->size) |
452 | return 0; | |
1da177e4 | 453 | } |
68ad546a | 454 | e = entry0 + newpos; |
1da177e4 LT |
455 | e->counters.pcnt = pos; |
456 | pos = newpos; | |
457 | } | |
458 | } | |
d7cdf816 | 459 | next: ; |
1da177e4 LT |
460 | } |
461 | return 1; | |
462 | } | |
463 | ||
87a2e70d | 464 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 465 | { |
6be3d859 JE |
466 | struct xt_mtdtor_param par; |
467 | ||
f54e9367 | 468 | par.net = net; |
6be3d859 JE |
469 | par.match = m->u.kernel.match; |
470 | par.matchinfo = m->data; | |
916a917d | 471 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
472 | if (par.match->destroy != NULL) |
473 | par.match->destroy(&par); | |
474 | module_put(par.match->me); | |
1da177e4 LT |
475 | } |
476 | ||
022748a9 | 477 | static int |
87a2e70d | 478 | check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
a96be246 | 479 | { |
9b4fce7a | 480 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 | 481 | |
9b4fce7a JE |
482 | par->match = m->u.kernel.match; |
483 | par->matchinfo = m->data; | |
484 | ||
d7cdf816 PNA |
485 | return xt_check_match(par, m->u.match_size - sizeof(*m), |
486 | ip->proto, ip->invflags & IPT_INV_PROTO); | |
a96be246 DM |
487 | } |
488 | ||
022748a9 | 489 | static int |
87a2e70d | 490 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 491 | { |
6709dbbb | 492 | struct xt_match *match; |
3cdc7c95 | 493 | int ret; |
1da177e4 | 494 | |
fd0ec0e6 JE |
495 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
496 | m->u.user.revision); | |
d7cdf816 | 497 | if (IS_ERR(match)) |
fd0ec0e6 | 498 | return PTR_ERR(match); |
1da177e4 LT |
499 | m->u.kernel.match = match; |
500 | ||
6bdb331b | 501 | ret = check_match(m, par); |
3cdc7c95 PM |
502 | if (ret) |
503 | goto err; | |
504 | ||
1da177e4 | 505 | return 0; |
3cdc7c95 PM |
506 | err: |
507 | module_put(m->u.kernel.match->me); | |
508 | return ret; | |
1da177e4 LT |
509 | } |
510 | ||
add67461 | 511 | static int check_target(struct ipt_entry *e, struct net *net, const char *name) |
a96be246 | 512 | { |
87a2e70d | 513 | struct xt_entry_target *t = ipt_get_target(e); |
af5d6dc2 | 514 | struct xt_tgchk_param par = { |
add67461 | 515 | .net = net, |
af5d6dc2 JE |
516 | .table = name, |
517 | .entryinfo = e, | |
518 | .target = t->u.kernel.target, | |
519 | .targinfo = t->data, | |
520 | .hook_mask = e->comefrom, | |
916a917d | 521 | .family = NFPROTO_IPV4, |
af5d6dc2 | 522 | }; |
a96be246 | 523 | |
d7cdf816 PNA |
524 | return xt_check_target(&par, t->u.target_size - sizeof(*t), |
525 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); | |
a96be246 | 526 | } |
1da177e4 | 527 | |
022748a9 | 528 | static int |
a83d8e8d | 529 | find_check_entry(struct ipt_entry *e, struct net *net, const char *name, |
ae0ac0ed FW |
530 | unsigned int size, |
531 | struct xt_percpu_counter_alloc_state *alloc_state) | |
1da177e4 | 532 | { |
87a2e70d | 533 | struct xt_entry_target *t; |
6709dbbb | 534 | struct xt_target *target; |
1da177e4 LT |
535 | int ret; |
536 | unsigned int j; | |
9b4fce7a | 537 | struct xt_mtchk_param mtpar; |
dcea992a | 538 | struct xt_entry_match *ematch; |
1da177e4 | 539 | |
ae0ac0ed | 540 | if (!xt_percpu_counter_alloc(alloc_state, &e->counters)) |
71ae0dff FW |
541 | return -ENOMEM; |
542 | ||
1da177e4 | 543 | j = 0; |
a83d8e8d | 544 | mtpar.net = net; |
9b4fce7a JE |
545 | mtpar.table = name; |
546 | mtpar.entryinfo = &e->ip; | |
547 | mtpar.hook_mask = e->comefrom; | |
916a917d | 548 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 549 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 550 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 551 | if (ret != 0) |
6bdb331b JE |
552 | goto cleanup_matches; |
553 | ++j; | |
dcea992a | 554 | } |
1da177e4 LT |
555 | |
556 | t = ipt_get_target(e); | |
d2a7b6ba JE |
557 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
558 | t->u.user.revision); | |
559 | if (IS_ERR(target)) { | |
d2a7b6ba | 560 | ret = PTR_ERR(target); |
1da177e4 LT |
561 | goto cleanup_matches; |
562 | } | |
563 | t->u.kernel.target = target; | |
564 | ||
add67461 | 565 | ret = check_target(e, net, name); |
3cdc7c95 PM |
566 | if (ret) |
567 | goto err; | |
71ae0dff | 568 | |
1da177e4 | 569 | return 0; |
3cdc7c95 PM |
570 | err: |
571 | module_put(t->u.kernel.target->me); | |
1da177e4 | 572 | cleanup_matches: |
6bdb331b JE |
573 | xt_ematch_foreach(ematch, e) { |
574 | if (j-- == 0) | |
dcea992a | 575 | break; |
6bdb331b JE |
576 | cleanup_match(ematch, net); |
577 | } | |
71ae0dff | 578 | |
4d31eef5 | 579 | xt_percpu_counter_free(&e->counters); |
71ae0dff | 580 | |
1da177e4 LT |
581 | return ret; |
582 | } | |
583 | ||
d5d1baa1 | 584 | static bool check_underflow(const struct ipt_entry *e) |
e2fe35c1 | 585 | { |
87a2e70d | 586 | const struct xt_entry_target *t; |
e2fe35c1 JE |
587 | unsigned int verdict; |
588 | ||
54d83fc7 | 589 | if (!unconditional(e)) |
e2fe35c1 | 590 | return false; |
d5d1baa1 | 591 | t = ipt_get_target_c(e); |
e2fe35c1 JE |
592 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
593 | return false; | |
87a2e70d | 594 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
595 | verdict = -verdict - 1; |
596 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
597 | } | |
598 | ||
022748a9 | 599 | static int |
1da177e4 | 600 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 601 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
602 | const unsigned char *base, |
603 | const unsigned char *limit, | |
1da177e4 LT |
604 | const unsigned int *hook_entries, |
605 | const unsigned int *underflows, | |
0559518b | 606 | unsigned int valid_hooks) |
1da177e4 LT |
607 | { |
608 | unsigned int h; | |
bdf533de | 609 | int err; |
1da177e4 | 610 | |
3666ed1c | 611 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 || |
6e94e0cf | 612 | (unsigned char *)e + sizeof(struct ipt_entry) >= limit || |
d7cdf816 | 613 | (unsigned char *)e + e->next_offset > limit) |
1da177e4 | 614 | return -EINVAL; |
1da177e4 LT |
615 | |
616 | if (e->next_offset | |
d7cdf816 | 617 | < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target)) |
1da177e4 | 618 | return -EINVAL; |
1da177e4 | 619 | |
aa412ba2 FW |
620 | if (!ip_checkentry(&e->ip)) |
621 | return -EINVAL; | |
622 | ||
ce683e5f FW |
623 | err = xt_check_entry_offsets(e, e->elems, e->target_offset, |
624 | e->next_offset); | |
bdf533de FW |
625 | if (err) |
626 | return err; | |
627 | ||
1da177e4 | 628 | /* Check hooks & underflows */ |
6e23ae2a | 629 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
630 | if (!(valid_hooks & (1 << h))) |
631 | continue; | |
1da177e4 LT |
632 | if ((unsigned char *)e - base == hook_entries[h]) |
633 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 634 | if ((unsigned char *)e - base == underflows[h]) { |
d7cdf816 | 635 | if (!check_underflow(e)) |
90e7d4ab | 636 | return -EINVAL; |
d7cdf816 | 637 | |
1da177e4 | 638 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 639 | } |
1da177e4 LT |
640 | } |
641 | ||
1da177e4 | 642 | /* Clear counters and comefrom */ |
2e4e6a17 | 643 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 644 | e->comefrom = 0; |
1da177e4 LT |
645 | return 0; |
646 | } | |
647 | ||
0559518b JE |
648 | static void |
649 | cleanup_entry(struct ipt_entry *e, struct net *net) | |
1da177e4 | 650 | { |
a2df1648 | 651 | struct xt_tgdtor_param par; |
87a2e70d | 652 | struct xt_entry_target *t; |
dcea992a | 653 | struct xt_entry_match *ematch; |
1da177e4 | 654 | |
1da177e4 | 655 | /* Cleanup all matches */ |
dcea992a | 656 | xt_ematch_foreach(ematch, e) |
6bdb331b | 657 | cleanup_match(ematch, net); |
1da177e4 | 658 | t = ipt_get_target(e); |
a2df1648 | 659 | |
add67461 | 660 | par.net = net; |
a2df1648 JE |
661 | par.target = t->u.kernel.target; |
662 | par.targinfo = t->data; | |
916a917d | 663 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
664 | if (par.target->destroy != NULL) |
665 | par.target->destroy(&par); | |
666 | module_put(par.target->me); | |
4d31eef5 | 667 | xt_percpu_counter_free(&e->counters); |
1da177e4 LT |
668 | } |
669 | ||
670 | /* Checks and translates the user-supplied table segment (held in | |
671 | newinfo) */ | |
672 | static int | |
0f234214 | 673 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
6c28255b | 674 | const struct ipt_replace *repl) |
1da177e4 | 675 | { |
ae0ac0ed | 676 | struct xt_percpu_counter_alloc_state alloc_state = { 0 }; |
72b2b1dd | 677 | struct ipt_entry *iter; |
f4dc7771 | 678 | unsigned int *offsets; |
1da177e4 | 679 | unsigned int i; |
72b2b1dd | 680 | int ret = 0; |
1da177e4 | 681 | |
0f234214 JE |
682 | newinfo->size = repl->size; |
683 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
684 | |
685 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 686 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
687 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
688 | newinfo->underflow[i] = 0xFFFFFFFF; | |
689 | } | |
690 | ||
f4dc7771 FW |
691 | offsets = xt_alloc_entry_offsets(newinfo->number); |
692 | if (!offsets) | |
693 | return -ENOMEM; | |
1da177e4 LT |
694 | i = 0; |
695 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
696 | xt_entry_foreach(iter, entry0, newinfo->size) { |
697 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
698 | entry0 + repl->size, |
699 | repl->hook_entry, | |
700 | repl->underflow, | |
701 | repl->valid_hooks); | |
72b2b1dd | 702 | if (ret != 0) |
f4dc7771 FW |
703 | goto out_free; |
704 | if (i < repl->num_entries) | |
705 | offsets[i] = (void *)iter - entry0; | |
0559518b | 706 | ++i; |
98dbbfc3 FW |
707 | if (strcmp(ipt_get_target(iter)->u.user.name, |
708 | XT_ERROR_TARGET) == 0) | |
709 | ++newinfo->stacksize; | |
72b2b1dd | 710 | } |
1da177e4 | 711 | |
f4dc7771 | 712 | ret = -EINVAL; |
d7cdf816 | 713 | if (i != repl->num_entries) |
f4dc7771 | 714 | goto out_free; |
1da177e4 LT |
715 | |
716 | /* Check hooks all assigned */ | |
6e23ae2a | 717 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 718 | /* Only hooks which are valid */ |
0f234214 | 719 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 | 720 | continue; |
d7cdf816 | 721 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) |
f4dc7771 | 722 | goto out_free; |
d7cdf816 | 723 | if (newinfo->underflow[i] == 0xFFFFFFFF) |
f4dc7771 | 724 | goto out_free; |
1da177e4 LT |
725 | } |
726 | ||
f4dc7771 FW |
727 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) { |
728 | ret = -ELOOP; | |
729 | goto out_free; | |
730 | } | |
731 | kvfree(offsets); | |
74c9c0c1 | 732 | |
1da177e4 LT |
733 | /* Finally, each sanity check must pass */ |
734 | i = 0; | |
72b2b1dd | 735 | xt_entry_foreach(iter, entry0, newinfo->size) { |
ae0ac0ed FW |
736 | ret = find_check_entry(iter, net, repl->name, repl->size, |
737 | &alloc_state); | |
72b2b1dd JE |
738 | if (ret != 0) |
739 | break; | |
0559518b | 740 | ++i; |
72b2b1dd | 741 | } |
1da177e4 | 742 | |
74c9c0c1 | 743 | if (ret != 0) { |
0559518b JE |
744 | xt_entry_foreach(iter, entry0, newinfo->size) { |
745 | if (i-- == 0) | |
72b2b1dd | 746 | break; |
0559518b JE |
747 | cleanup_entry(iter, net); |
748 | } | |
74c9c0c1 DM |
749 | return ret; |
750 | } | |
1da177e4 | 751 | |
f4dc7771 FW |
752 | return ret; |
753 | out_free: | |
754 | kvfree(offsets); | |
1da177e4 LT |
755 | return ret; |
756 | } | |
757 | ||
1da177e4 | 758 | static void |
2e4e6a17 HW |
759 | get_counters(const struct xt_table_info *t, |
760 | struct xt_counters counters[]) | |
1da177e4 | 761 | { |
72b2b1dd | 762 | struct ipt_entry *iter; |
1da177e4 LT |
763 | unsigned int cpu; |
764 | unsigned int i; | |
765 | ||
6f912042 | 766 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 767 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 768 | |
1da177e4 | 769 | i = 0; |
482cfc31 | 770 | xt_entry_foreach(iter, t->entries, t->size) { |
71ae0dff | 771 | struct xt_counters *tmp; |
83723d60 ED |
772 | u64 bcnt, pcnt; |
773 | unsigned int start; | |
774 | ||
71ae0dff | 775 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
83723d60 | 776 | do { |
7f5c6d4f | 777 | start = read_seqcount_begin(s); |
71ae0dff FW |
778 | bcnt = tmp->bcnt; |
779 | pcnt = tmp->pcnt; | |
7f5c6d4f | 780 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
781 | |
782 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
783 | ++i; /* macro does multi eval of i */ |
784 | } | |
1da177e4 | 785 | } |
78454473 SH |
786 | } |
787 | ||
d5d1baa1 | 788 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 789 | { |
2722971c | 790 | unsigned int countersize; |
2e4e6a17 | 791 | struct xt_counters *counters; |
d5d1baa1 | 792 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
793 | |
794 | /* We need atomic snapshot of counters: rest doesn't change | |
795 | (other than comefrom, which userspace doesn't care | |
796 | about). */ | |
2e4e6a17 | 797 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 798 | counters = vzalloc(countersize); |
1da177e4 LT |
799 | |
800 | if (counters == NULL) | |
942e4a2b | 801 | return ERR_PTR(-ENOMEM); |
78454473 | 802 | |
942e4a2b | 803 | get_counters(private, counters); |
1da177e4 | 804 | |
2722971c DM |
805 | return counters; |
806 | } | |
807 | ||
808 | static int | |
809 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 810 | const struct xt_table *table, |
2722971c DM |
811 | void __user *userptr) |
812 | { | |
813 | unsigned int off, num; | |
d5d1baa1 | 814 | const struct ipt_entry *e; |
2722971c | 815 | struct xt_counters *counters; |
5452e425 | 816 | const struct xt_table_info *private = table->private; |
2722971c | 817 | int ret = 0; |
711bdde6 | 818 | const void *loc_cpu_entry; |
2722971c DM |
819 | |
820 | counters = alloc_counters(table); | |
821 | if (IS_ERR(counters)) | |
822 | return PTR_ERR(counters); | |
823 | ||
482cfc31 | 824 | loc_cpu_entry = private->entries; |
1da177e4 LT |
825 | |
826 | /* FIXME: use iterator macros --RR */ | |
827 | /* ... then go back and fix counters and names */ | |
828 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
829 | unsigned int i; | |
87a2e70d JE |
830 | const struct xt_entry_match *m; |
831 | const struct xt_entry_target *t; | |
1da177e4 | 832 | |
68ad546a | 833 | e = loc_cpu_entry + off; |
f77bc5b2 WB |
834 | if (copy_to_user(userptr + off, e, sizeof(*e))) { |
835 | ret = -EFAULT; | |
836 | goto free_counters; | |
837 | } | |
1da177e4 LT |
838 | if (copy_to_user(userptr + off |
839 | + offsetof(struct ipt_entry, counters), | |
840 | &counters[num], | |
841 | sizeof(counters[num])) != 0) { | |
842 | ret = -EFAULT; | |
843 | goto free_counters; | |
844 | } | |
845 | ||
846 | for (i = sizeof(struct ipt_entry); | |
847 | i < e->target_offset; | |
848 | i += m->u.match_size) { | |
849 | m = (void *)e + i; | |
850 | ||
f77bc5b2 | 851 | if (xt_match_to_user(m, userptr + off + i)) { |
1da177e4 LT |
852 | ret = -EFAULT; |
853 | goto free_counters; | |
854 | } | |
855 | } | |
856 | ||
d5d1baa1 | 857 | t = ipt_get_target_c(e); |
f77bc5b2 | 858 | if (xt_target_to_user(t, userptr + off + e->target_offset)) { |
1da177e4 LT |
859 | ret = -EFAULT; |
860 | goto free_counters; | |
861 | } | |
862 | } | |
863 | ||
864 | free_counters: | |
865 | vfree(counters); | |
866 | return ret; | |
867 | } | |
868 | ||
2722971c | 869 | #ifdef CONFIG_COMPAT |
739674fb | 870 | static void compat_standard_from_user(void *dst, const void *src) |
2722971c | 871 | { |
9fa492cd | 872 | int v = *(compat_int_t *)src; |
2722971c | 873 | |
9fa492cd | 874 | if (v > 0) |
b386d9f5 | 875 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
876 | memcpy(dst, &v, sizeof(v)); |
877 | } | |
46c5ea3c | 878 | |
739674fb | 879 | static int compat_standard_to_user(void __user *dst, const void *src) |
2722971c | 880 | { |
9fa492cd | 881 | compat_int_t cv = *(int *)src; |
2722971c | 882 | |
9fa492cd | 883 | if (cv > 0) |
b386d9f5 | 884 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 885 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
886 | } |
887 | ||
d5d1baa1 | 888 | static int compat_calc_entry(const struct ipt_entry *e, |
4b478248 | 889 | const struct xt_table_info *info, |
d5d1baa1 | 890 | const void *base, struct xt_table_info *newinfo) |
2722971c | 891 | { |
dcea992a | 892 | const struct xt_entry_match *ematch; |
87a2e70d | 893 | const struct xt_entry_target *t; |
e5b5ef7d | 894 | unsigned int entry_offset; |
2722971c DM |
895 | int off, i, ret; |
896 | ||
30c08c41 | 897 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c | 898 | entry_offset = (void *)e - base; |
dcea992a | 899 | xt_ematch_foreach(ematch, e) |
6bdb331b | 900 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 901 | t = ipt_get_target_c(e); |
9fa492cd | 902 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 903 | newinfo->size -= off; |
b386d9f5 | 904 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
905 | if (ret) |
906 | return ret; | |
907 | ||
6e23ae2a | 908 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
909 | if (info->hook_entry[i] && |
910 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 911 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
912 | if (info->underflow[i] && |
913 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
914 | newinfo->underflow[i] -= off; |
915 | } | |
916 | return 0; | |
917 | } | |
918 | ||
259d4e41 | 919 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 920 | struct xt_table_info *newinfo) |
2722971c | 921 | { |
72b2b1dd | 922 | struct ipt_entry *iter; |
711bdde6 | 923 | const void *loc_cpu_entry; |
0559518b | 924 | int ret; |
2722971c DM |
925 | |
926 | if (!newinfo || !info) | |
927 | return -EINVAL; | |
928 | ||
482cfc31 | 929 | /* we dont care about newinfo->entries */ |
259d4e41 ED |
930 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
931 | newinfo->initial_entries = 0; | |
482cfc31 | 932 | loc_cpu_entry = info->entries; |
255d0dc3 | 933 | xt_compat_init_offsets(AF_INET, info->number); |
72b2b1dd JE |
934 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
935 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
936 | if (ret != 0) | |
0559518b | 937 | return ret; |
72b2b1dd | 938 | } |
0559518b | 939 | return 0; |
2722971c DM |
940 | } |
941 | #endif | |
942 | ||
d5d1baa1 | 943 | static int get_info(struct net *net, void __user *user, |
6c28255b | 944 | const int *len, int compat) |
2722971c | 945 | { |
12b00c2c | 946 | char name[XT_TABLE_MAXNAMELEN]; |
e60a13e0 | 947 | struct xt_table *t; |
2722971c DM |
948 | int ret; |
949 | ||
d7cdf816 | 950 | if (*len != sizeof(struct ipt_getinfo)) |
2722971c | 951 | return -EINVAL; |
2722971c DM |
952 | |
953 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
954 | return -EFAULT; | |
955 | ||
12b00c2c | 956 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
2722971c DM |
957 | #ifdef CONFIG_COMPAT |
958 | if (compat) | |
959 | xt_compat_lock(AF_INET); | |
960 | #endif | |
34bd137b | 961 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 962 | "iptable_%s", name); |
eb1a6bdc | 963 | if (t) { |
2722971c | 964 | struct ipt_getinfo info; |
5452e425 | 965 | const struct xt_table_info *private = t->private; |
2722971c | 966 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
967 | struct xt_table_info tmp; |
968 | ||
2722971c | 969 | if (compat) { |
2722971c | 970 | ret = compat_table_info(private, &tmp); |
b386d9f5 | 971 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 972 | private = &tmp; |
2722971c DM |
973 | } |
974 | #endif | |
b5f15ac4 | 975 | memset(&info, 0, sizeof(info)); |
2722971c DM |
976 | info.valid_hooks = t->valid_hooks; |
977 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 978 | sizeof(info.hook_entry)); |
2722971c | 979 | memcpy(info.underflow, private->underflow, |
4b478248 | 980 | sizeof(info.underflow)); |
2722971c DM |
981 | info.num_entries = private->number; |
982 | info.size = private->size; | |
983 | strcpy(info.name, name); | |
984 | ||
985 | if (copy_to_user(user, &info, *len) != 0) | |
986 | ret = -EFAULT; | |
987 | else | |
988 | ret = 0; | |
989 | ||
990 | xt_table_unlock(t); | |
991 | module_put(t->me); | |
992 | } else | |
eb1a6bdc | 993 | ret = -ENOENT; |
2722971c DM |
994 | #ifdef CONFIG_COMPAT |
995 | if (compat) | |
996 | xt_compat_unlock(AF_INET); | |
997 | #endif | |
998 | return ret; | |
999 | } | |
1000 | ||
1001 | static int | |
d5d1baa1 JE |
1002 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
1003 | const int *len) | |
2722971c DM |
1004 | { |
1005 | int ret; | |
1006 | struct ipt_get_entries get; | |
e60a13e0 | 1007 | struct xt_table *t; |
2722971c | 1008 | |
d7cdf816 | 1009 | if (*len < sizeof(get)) |
2722971c | 1010 | return -EINVAL; |
2722971c DM |
1011 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1012 | return -EFAULT; | |
d7cdf816 | 1013 | if (*len != sizeof(struct ipt_get_entries) + get.size) |
2722971c | 1014 | return -EINVAL; |
b301f253 | 1015 | get.name[sizeof(get.name) - 1] = '\0'; |
2722971c | 1016 | |
34bd137b | 1017 | t = xt_find_table_lock(net, AF_INET, get.name); |
eb1a6bdc | 1018 | if (t) { |
5452e425 | 1019 | const struct xt_table_info *private = t->private; |
2722971c DM |
1020 | if (get.size == private->size) |
1021 | ret = copy_entries_to_user(private->size, | |
1022 | t, uptr->entrytable); | |
d7cdf816 | 1023 | else |
544473c1 | 1024 | ret = -EAGAIN; |
d7cdf816 | 1025 | |
2722971c DM |
1026 | module_put(t->me); |
1027 | xt_table_unlock(t); | |
1028 | } else | |
eb1a6bdc | 1029 | ret = -ENOENT; |
2722971c DM |
1030 | |
1031 | return ret; | |
1032 | } | |
1033 | ||
1034 | static int | |
34bd137b | 1035 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1036 | struct xt_table_info *newinfo, unsigned int num_counters, |
1037 | void __user *counters_ptr) | |
2722971c DM |
1038 | { |
1039 | int ret; | |
e60a13e0 | 1040 | struct xt_table *t; |
2722971c DM |
1041 | struct xt_table_info *oldinfo; |
1042 | struct xt_counters *counters; | |
72b2b1dd | 1043 | struct ipt_entry *iter; |
2722971c DM |
1044 | |
1045 | ret = 0; | |
83723d60 | 1046 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
2722971c DM |
1047 | if (!counters) { |
1048 | ret = -ENOMEM; | |
1049 | goto out; | |
1050 | } | |
1051 | ||
34bd137b | 1052 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c | 1053 | "iptable_%s", name); |
eb1a6bdc JL |
1054 | if (!t) { |
1055 | ret = -ENOENT; | |
2722971c DM |
1056 | goto free_newinfo_counters_untrans; |
1057 | } | |
1058 | ||
1059 | /* You lied! */ | |
1060 | if (valid_hooks != t->valid_hooks) { | |
2722971c DM |
1061 | ret = -EINVAL; |
1062 | goto put_module; | |
1063 | } | |
1064 | ||
1065 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1066 | if (!oldinfo) | |
1067 | goto put_module; | |
1068 | ||
1069 | /* Update module usage count based on number of rules */ | |
2722971c DM |
1070 | if ((oldinfo->number > oldinfo->initial_entries) || |
1071 | (newinfo->number <= oldinfo->initial_entries)) | |
1072 | module_put(t->me); | |
1073 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1074 | (newinfo->number <= oldinfo->initial_entries)) | |
1075 | module_put(t->me); | |
1076 | ||
942e4a2b | 1077 | /* Get the old counters, and synchronize with replace */ |
2722971c | 1078 | get_counters(oldinfo, counters); |
942e4a2b | 1079 | |
2722971c | 1080 | /* Decrease module usage counts and free resource */ |
482cfc31 | 1081 | xt_entry_foreach(iter, oldinfo->entries, oldinfo->size) |
0559518b | 1082 | cleanup_entry(iter, net); |
72b2b1dd | 1083 | |
2722971c DM |
1084 | xt_free_table_info(oldinfo); |
1085 | if (copy_to_user(counters_ptr, counters, | |
c58dd2dd TG |
1086 | sizeof(struct xt_counters) * num_counters) != 0) { |
1087 | /* Silent error, can't fail, new table is already in place */ | |
1088 | net_warn_ratelimited("iptables: counters copy to user failed while replacing table\n"); | |
1089 | } | |
2722971c DM |
1090 | vfree(counters); |
1091 | xt_table_unlock(t); | |
1092 | return ret; | |
1093 | ||
1094 | put_module: | |
1095 | module_put(t->me); | |
1096 | xt_table_unlock(t); | |
1097 | free_newinfo_counters_untrans: | |
1098 | vfree(counters); | |
1099 | out: | |
1100 | return ret; | |
1101 | } | |
1102 | ||
1103 | static int | |
d5d1baa1 | 1104 | do_replace(struct net *net, const void __user *user, unsigned int len) |
2722971c DM |
1105 | { |
1106 | int ret; | |
1107 | struct ipt_replace tmp; | |
1108 | struct xt_table_info *newinfo; | |
1109 | void *loc_cpu_entry; | |
72b2b1dd | 1110 | struct ipt_entry *iter; |
2722971c DM |
1111 | |
1112 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1113 | return -EFAULT; | |
1114 | ||
2722971c | 1115 | /* overflow check */ |
2722971c DM |
1116 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1117 | return -ENOMEM; | |
1086bbe9 DJ |
1118 | if (tmp.num_counters == 0) |
1119 | return -EINVAL; | |
1120 | ||
78b79876 | 1121 | tmp.name[sizeof(tmp.name)-1] = 0; |
2722971c DM |
1122 | |
1123 | newinfo = xt_alloc_table_info(tmp.size); | |
1124 | if (!newinfo) | |
1125 | return -ENOMEM; | |
1126 | ||
482cfc31 | 1127 | loc_cpu_entry = newinfo->entries; |
2722971c DM |
1128 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1129 | tmp.size) != 0) { | |
1130 | ret = -EFAULT; | |
1131 | goto free_newinfo; | |
1132 | } | |
1133 | ||
0f234214 | 1134 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
2722971c DM |
1135 | if (ret != 0) |
1136 | goto free_newinfo; | |
1137 | ||
34bd137b | 1138 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1139 | tmp.num_counters, tmp.counters); |
2722971c DM |
1140 | if (ret) |
1141 | goto free_newinfo_untrans; | |
1142 | return 0; | |
1143 | ||
1144 | free_newinfo_untrans: | |
72b2b1dd | 1145 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1146 | cleanup_entry(iter, net); |
2722971c DM |
1147 | free_newinfo: |
1148 | xt_free_table_info(newinfo); | |
1149 | return ret; | |
1150 | } | |
1151 | ||
2722971c | 1152 | static int |
d5d1baa1 | 1153 | do_add_counters(struct net *net, const void __user *user, |
6c28255b | 1154 | unsigned int len, int compat) |
2722971c | 1155 | { |
482cfc31 | 1156 | unsigned int i; |
2722971c DM |
1157 | struct xt_counters_info tmp; |
1158 | struct xt_counters *paddc; | |
e60a13e0 | 1159 | struct xt_table *t; |
5452e425 | 1160 | const struct xt_table_info *private; |
2722971c | 1161 | int ret = 0; |
72b2b1dd | 1162 | struct ipt_entry *iter; |
7f5c6d4f | 1163 | unsigned int addend; |
2722971c | 1164 | |
d7591f0c FW |
1165 | paddc = xt_copy_counters_from_user(user, len, &tmp, compat); |
1166 | if (IS_ERR(paddc)) | |
1167 | return PTR_ERR(paddc); | |
2722971c | 1168 | |
d7591f0c | 1169 | t = xt_find_table_lock(net, AF_INET, tmp.name); |
eb1a6bdc JL |
1170 | if (!t) { |
1171 | ret = -ENOENT; | |
2722971c DM |
1172 | goto free; |
1173 | } | |
1174 | ||
942e4a2b | 1175 | local_bh_disable(); |
2722971c | 1176 | private = t->private; |
d7591f0c | 1177 | if (private->number != tmp.num_counters) { |
2722971c DM |
1178 | ret = -EINVAL; |
1179 | goto unlock_up_free; | |
1180 | } | |
1181 | ||
1182 | i = 0; | |
7f5c6d4f | 1183 | addend = xt_write_recseq_begin(); |
482cfc31 | 1184 | xt_entry_foreach(iter, private->entries, private->size) { |
71ae0dff FW |
1185 | struct xt_counters *tmp; |
1186 | ||
1187 | tmp = xt_get_this_cpu_counter(&iter->counters); | |
1188 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); | |
0559518b JE |
1189 | ++i; |
1190 | } | |
7f5c6d4f | 1191 | xt_write_recseq_end(addend); |
2722971c | 1192 | unlock_up_free: |
942e4a2b | 1193 | local_bh_enable(); |
2722971c DM |
1194 | xt_table_unlock(t); |
1195 | module_put(t->me); | |
1196 | free: | |
1197 | vfree(paddc); | |
1198 | ||
1199 | return ret; | |
1200 | } | |
1201 | ||
1202 | #ifdef CONFIG_COMPAT | |
1203 | struct compat_ipt_replace { | |
12b00c2c | 1204 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1205 | u32 valid_hooks; |
1206 | u32 num_entries; | |
1207 | u32 size; | |
6e23ae2a PM |
1208 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1209 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c | 1210 | u32 num_counters; |
87a2e70d | 1211 | compat_uptr_t counters; /* struct xt_counters * */ |
2722971c DM |
1212 | struct compat_ipt_entry entries[0]; |
1213 | }; | |
1214 | ||
a18aa31b PM |
1215 | static int |
1216 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1217 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1218 | unsigned int i) |
2722971c | 1219 | { |
87a2e70d | 1220 | struct xt_entry_target *t; |
2722971c DM |
1221 | struct compat_ipt_entry __user *ce; |
1222 | u_int16_t target_offset, next_offset; | |
1223 | compat_uint_t origsize; | |
dcea992a JE |
1224 | const struct xt_entry_match *ematch; |
1225 | int ret = 0; | |
2722971c | 1226 | |
2722971c | 1227 | origsize = *size; |
68ad546a | 1228 | ce = *dstptr; |
0559518b JE |
1229 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
1230 | copy_to_user(&ce->counters, &counters[i], | |
1231 | sizeof(counters[i])) != 0) | |
1232 | return -EFAULT; | |
a18aa31b | 1233 | |
2722971c | 1234 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1235 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1236 | ||
dcea992a JE |
1237 | xt_ematch_foreach(ematch, e) { |
1238 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1239 | if (ret != 0) | |
6bdb331b | 1240 | return ret; |
dcea992a | 1241 | } |
2722971c | 1242 | target_offset = e->target_offset - (origsize - *size); |
2722971c | 1243 | t = ipt_get_target(e); |
9fa492cd | 1244 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c | 1245 | if (ret) |
0559518b | 1246 | return ret; |
2722971c | 1247 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1248 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1249 | put_user(next_offset, &ce->next_offset) != 0) | |
1250 | return -EFAULT; | |
2722971c | 1251 | return 0; |
2722971c DM |
1252 | } |
1253 | ||
022748a9 | 1254 | static int |
87a2e70d | 1255 | compat_find_calc_match(struct xt_entry_match *m, |
4b478248 | 1256 | const struct ipt_ip *ip, |
6bdb331b | 1257 | int *size) |
2722971c | 1258 | { |
6709dbbb | 1259 | struct xt_match *match; |
2722971c | 1260 | |
fd0ec0e6 JE |
1261 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
1262 | m->u.user.revision); | |
d7cdf816 | 1263 | if (IS_ERR(match)) |
fd0ec0e6 | 1264 | return PTR_ERR(match); |
d7cdf816 | 1265 | |
2722971c | 1266 | m->u.kernel.match = match; |
9fa492cd | 1267 | *size += xt_compat_match_offset(match); |
4c1b52bc DM |
1268 | return 0; |
1269 | } | |
1270 | ||
0559518b | 1271 | static void compat_release_entry(struct compat_ipt_entry *e) |
4c1b52bc | 1272 | { |
87a2e70d | 1273 | struct xt_entry_target *t; |
dcea992a | 1274 | struct xt_entry_match *ematch; |
4c1b52bc | 1275 | |
4c1b52bc | 1276 | /* Cleanup all matches */ |
dcea992a | 1277 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1278 | module_put(ematch->u.kernel.match->me); |
73cd598d | 1279 | t = compat_ipt_get_target(e); |
4c1b52bc | 1280 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1281 | } |
1282 | ||
022748a9 | 1283 | static int |
73cd598d | 1284 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1285 | struct xt_table_info *newinfo, |
1286 | unsigned int *size, | |
d5d1baa1 | 1287 | const unsigned char *base, |
09d96860 | 1288 | const unsigned char *limit) |
2722971c | 1289 | { |
dcea992a | 1290 | struct xt_entry_match *ematch; |
87a2e70d | 1291 | struct xt_entry_target *t; |
6709dbbb | 1292 | struct xt_target *target; |
e5b5ef7d | 1293 | unsigned int entry_offset; |
b0a6363c | 1294 | unsigned int j; |
09d96860 | 1295 | int ret, off; |
2722971c | 1296 | |
3666ed1c | 1297 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
6e94e0cf | 1298 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit || |
d7cdf816 | 1299 | (unsigned char *)e + e->next_offset > limit) |
2722971c | 1300 | return -EINVAL; |
2722971c DM |
1301 | |
1302 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
d7cdf816 | 1303 | sizeof(struct compat_xt_entry_target)) |
2722971c | 1304 | return -EINVAL; |
2722971c | 1305 | |
aa412ba2 FW |
1306 | if (!ip_checkentry(&e->ip)) |
1307 | return -EINVAL; | |
1308 | ||
ce683e5f | 1309 | ret = xt_compat_check_entry_offsets(e, e->elems, |
fc1221b3 | 1310 | e->target_offset, e->next_offset); |
a96be246 DM |
1311 | if (ret) |
1312 | return ret; | |
590bdf7f | 1313 | |
30c08c41 | 1314 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1315 | entry_offset = (void *)e - (void *)base; |
1316 | j = 0; | |
dcea992a | 1317 | xt_ematch_foreach(ematch, e) { |
7d3f843e | 1318 | ret = compat_find_calc_match(ematch, &e->ip, &off); |
dcea992a | 1319 | if (ret != 0) |
6bdb331b JE |
1320 | goto release_matches; |
1321 | ++j; | |
dcea992a | 1322 | } |
2722971c | 1323 | |
73cd598d | 1324 | t = compat_ipt_get_target(e); |
d2a7b6ba JE |
1325 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
1326 | t->u.user.revision); | |
1327 | if (IS_ERR(target)) { | |
d2a7b6ba | 1328 | ret = PTR_ERR(target); |
4c1b52bc | 1329 | goto release_matches; |
2722971c DM |
1330 | } |
1331 | t->u.kernel.target = target; | |
1332 | ||
9fa492cd | 1333 | off += xt_compat_target_offset(target); |
2722971c | 1334 | *size += off; |
b386d9f5 | 1335 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1336 | if (ret) |
1337 | goto out; | |
1338 | ||
2722971c | 1339 | return 0; |
bec71b16 | 1340 | |
2722971c | 1341 | out: |
bec71b16 | 1342 | module_put(t->u.kernel.target->me); |
4c1b52bc | 1343 | release_matches: |
6bdb331b JE |
1344 | xt_ematch_foreach(ematch, e) { |
1345 | if (j-- == 0) | |
dcea992a | 1346 | break; |
6bdb331b JE |
1347 | module_put(ematch->u.kernel.match->me); |
1348 | } | |
2722971c DM |
1349 | return ret; |
1350 | } | |
1351 | ||
0188346f | 1352 | static void |
73cd598d | 1353 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
7d3f843e | 1354 | unsigned int *size, |
4b478248 | 1355 | struct xt_table_info *newinfo, unsigned char *base) |
2722971c | 1356 | { |
87a2e70d | 1357 | struct xt_entry_target *t; |
6709dbbb | 1358 | struct xt_target *target; |
2722971c DM |
1359 | struct ipt_entry *de; |
1360 | unsigned int origsize; | |
0188346f | 1361 | int h; |
dcea992a | 1362 | struct xt_entry_match *ematch; |
2722971c | 1363 | |
2722971c | 1364 | origsize = *size; |
68ad546a | 1365 | de = *dstptr; |
2722971c | 1366 | memcpy(de, e, sizeof(struct ipt_entry)); |
73cd598d | 1367 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1368 | |
73cd598d | 1369 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1370 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1371 | ||
0188346f FW |
1372 | xt_ematch_foreach(ematch, e) |
1373 | xt_compat_match_from_user(ematch, dstptr, size); | |
1374 | ||
2722971c | 1375 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1376 | t = compat_ipt_get_target(e); |
2722971c | 1377 | target = t->u.kernel.target; |
9fa492cd | 1378 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1379 | |
1380 | de->next_offset = e->next_offset - (origsize - *size); | |
09d96860 | 1381 | |
6e23ae2a | 1382 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1383 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1384 | newinfo->hook_entry[h] -= origsize - *size; | |
1385 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1386 | newinfo->underflow[h] -= origsize - *size; | |
1387 | } | |
f6677f43 DM |
1388 | } |
1389 | ||
1da177e4 | 1390 | static int |
a83d8e8d | 1391 | translate_compat_table(struct net *net, |
4b478248 PM |
1392 | struct xt_table_info **pinfo, |
1393 | void **pentry0, | |
7d3f843e | 1394 | const struct compat_ipt_replace *compatr) |
1da177e4 | 1395 | { |
920b868a | 1396 | unsigned int i, j; |
2722971c DM |
1397 | struct xt_table_info *newinfo, *info; |
1398 | void *pos, *entry0, *entry1; | |
72b2b1dd | 1399 | struct compat_ipt_entry *iter0; |
09d96860 | 1400 | struct ipt_replace repl; |
2722971c | 1401 | unsigned int size; |
0559518b | 1402 | int ret; |
1da177e4 | 1403 | |
2722971c DM |
1404 | info = *pinfo; |
1405 | entry0 = *pentry0; | |
7d3f843e FW |
1406 | size = compatr->size; |
1407 | info->number = compatr->num_entries; | |
2722971c | 1408 | |
920b868a | 1409 | j = 0; |
2722971c | 1410 | xt_compat_lock(AF_INET); |
7d3f843e | 1411 | xt_compat_init_offsets(AF_INET, compatr->num_entries); |
2722971c | 1412 | /* Walk through entries, checking offsets. */ |
7d3f843e | 1413 | xt_entry_foreach(iter0, entry0, compatr->size) { |
72b2b1dd | 1414 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
6b4ff2d7 | 1415 | entry0, |
09d96860 | 1416 | entry0 + compatr->size); |
72b2b1dd | 1417 | if (ret != 0) |
0559518b JE |
1418 | goto out_unlock; |
1419 | ++j; | |
72b2b1dd | 1420 | } |
2722971c DM |
1421 | |
1422 | ret = -EINVAL; | |
d7cdf816 | 1423 | if (j != compatr->num_entries) |
2722971c | 1424 | goto out_unlock; |
2722971c | 1425 | |
2722971c DM |
1426 | ret = -ENOMEM; |
1427 | newinfo = xt_alloc_table_info(size); | |
1428 | if (!newinfo) | |
1429 | goto out_unlock; | |
1430 | ||
7d3f843e | 1431 | newinfo->number = compatr->num_entries; |
6e23ae2a | 1432 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
09d96860 FW |
1433 | newinfo->hook_entry[i] = compatr->hook_entry[i]; |
1434 | newinfo->underflow[i] = compatr->underflow[i]; | |
2722971c | 1435 | } |
482cfc31 | 1436 | entry1 = newinfo->entries; |
2722971c | 1437 | pos = entry1; |
7d3f843e | 1438 | size = compatr->size; |
0188346f FW |
1439 | xt_entry_foreach(iter0, entry0, compatr->size) |
1440 | compat_copy_entry_from_user(iter0, &pos, &size, | |
1441 | newinfo, entry1); | |
1442 | ||
09d96860 FW |
1443 | /* all module references in entry0 are now gone. |
1444 | * entry1/newinfo contains a 64bit ruleset that looks exactly as | |
1445 | * generated by 64bit userspace. | |
1446 | * | |
1447 | * Call standard translate_table() to validate all hook_entrys, | |
1448 | * underflows, check for loops, etc. | |
1449 | */ | |
b386d9f5 | 1450 | xt_compat_flush_offsets(AF_INET); |
2722971c | 1451 | xt_compat_unlock(AF_INET); |
2722971c | 1452 | |
09d96860 | 1453 | memcpy(&repl, compatr, sizeof(*compatr)); |
2722971c | 1454 | |
09d96860 FW |
1455 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1456 | repl.hook_entry[i] = newinfo->hook_entry[i]; | |
1457 | repl.underflow[i] = newinfo->underflow[i]; | |
4c1b52bc | 1458 | } |
f6677f43 | 1459 | |
09d96860 FW |
1460 | repl.num_counters = 0; |
1461 | repl.counters = NULL; | |
1462 | repl.size = newinfo->size; | |
1463 | ret = translate_table(net, newinfo, entry1, &repl); | |
1464 | if (ret) | |
1465 | goto free_newinfo; | |
1466 | ||
2722971c DM |
1467 | *pinfo = newinfo; |
1468 | *pentry0 = entry1; | |
1469 | xt_free_table_info(info); | |
1470 | return 0; | |
1da177e4 | 1471 | |
2722971c DM |
1472 | free_newinfo: |
1473 | xt_free_table_info(newinfo); | |
09d96860 FW |
1474 | return ret; |
1475 | out_unlock: | |
1476 | xt_compat_flush_offsets(AF_INET); | |
1477 | xt_compat_unlock(AF_INET); | |
7d3f843e | 1478 | xt_entry_foreach(iter0, entry0, compatr->size) { |
0559518b | 1479 | if (j-- == 0) |
72b2b1dd | 1480 | break; |
0559518b JE |
1481 | compat_release_entry(iter0); |
1482 | } | |
1da177e4 LT |
1483 | return ret; |
1484 | } | |
1485 | ||
1486 | static int | |
34bd137b | 1487 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1488 | { |
1489 | int ret; | |
2722971c DM |
1490 | struct compat_ipt_replace tmp; |
1491 | struct xt_table_info *newinfo; | |
1492 | void *loc_cpu_entry; | |
72b2b1dd | 1493 | struct ipt_entry *iter; |
1da177e4 LT |
1494 | |
1495 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1496 | return -EFAULT; | |
1497 | ||
ee4bb818 | 1498 | /* overflow check */ |
ee4bb818 KK |
1499 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1500 | return -ENOMEM; | |
1086bbe9 DJ |
1501 | if (tmp.num_counters == 0) |
1502 | return -EINVAL; | |
1503 | ||
78b79876 | 1504 | tmp.name[sizeof(tmp.name)-1] = 0; |
ee4bb818 | 1505 | |
2e4e6a17 | 1506 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1507 | if (!newinfo) |
1508 | return -ENOMEM; | |
1509 | ||
482cfc31 | 1510 | loc_cpu_entry = newinfo->entries; |
31836064 | 1511 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1da177e4 LT |
1512 | tmp.size) != 0) { |
1513 | ret = -EFAULT; | |
1514 | goto free_newinfo; | |
1515 | } | |
1516 | ||
7d3f843e | 1517 | ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp); |
2722971c | 1518 | if (ret != 0) |
1da177e4 | 1519 | goto free_newinfo; |
1da177e4 | 1520 | |
34bd137b | 1521 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1522 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1523 | if (ret) |
1524 | goto free_newinfo_untrans; | |
1525 | return 0; | |
1da177e4 | 1526 | |
2722971c | 1527 | free_newinfo_untrans: |
72b2b1dd | 1528 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1529 | cleanup_entry(iter, net); |
2722971c DM |
1530 | free_newinfo: |
1531 | xt_free_table_info(newinfo); | |
1532 | return ret; | |
1533 | } | |
1da177e4 | 1534 | |
2722971c DM |
1535 | static int |
1536 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1537 | unsigned int len) |
2722971c DM |
1538 | { |
1539 | int ret; | |
1da177e4 | 1540 | |
52e804c6 | 1541 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
2722971c | 1542 | return -EPERM; |
1da177e4 | 1543 | |
2722971c DM |
1544 | switch (cmd) { |
1545 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1546 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1547 | break; |
1da177e4 | 1548 | |
2722971c | 1549 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1550 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1551 | break; |
1552 | ||
1553 | default: | |
2722971c DM |
1554 | ret = -EINVAL; |
1555 | } | |
1da177e4 | 1556 | |
1da177e4 LT |
1557 | return ret; |
1558 | } | |
1559 | ||
4b478248 | 1560 | struct compat_ipt_get_entries { |
12b00c2c | 1561 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1562 | compat_uint_t size; |
1563 | struct compat_ipt_entry entrytable[0]; | |
1564 | }; | |
1da177e4 | 1565 | |
4b478248 PM |
1566 | static int |
1567 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1568 | void __user *userptr) | |
2722971c | 1569 | { |
2722971c | 1570 | struct xt_counters *counters; |
5452e425 | 1571 | const struct xt_table_info *private = table->private; |
2722971c DM |
1572 | void __user *pos; |
1573 | unsigned int size; | |
1574 | int ret = 0; | |
a18aa31b | 1575 | unsigned int i = 0; |
72b2b1dd | 1576 | struct ipt_entry *iter; |
1da177e4 | 1577 | |
2722971c DM |
1578 | counters = alloc_counters(table); |
1579 | if (IS_ERR(counters)) | |
1580 | return PTR_ERR(counters); | |
1581 | ||
2722971c DM |
1582 | pos = userptr; |
1583 | size = total_size; | |
482cfc31 | 1584 | xt_entry_foreach(iter, private->entries, total_size) { |
72b2b1dd | 1585 | ret = compat_copy_entry_to_user(iter, &pos, |
6b4ff2d7 | 1586 | &size, counters, i++); |
72b2b1dd JE |
1587 | if (ret != 0) |
1588 | break; | |
1589 | } | |
2722971c | 1590 | |
2722971c DM |
1591 | vfree(counters); |
1592 | return ret; | |
1da177e4 LT |
1593 | } |
1594 | ||
1595 | static int | |
34bd137b AD |
1596 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1597 | int *len) | |
1da177e4 | 1598 | { |
2722971c DM |
1599 | int ret; |
1600 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1601 | struct xt_table *t; |
1da177e4 | 1602 | |
d7cdf816 | 1603 | if (*len < sizeof(get)) |
1da177e4 LT |
1604 | return -EINVAL; |
1605 | ||
2722971c DM |
1606 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1607 | return -EFAULT; | |
1da177e4 | 1608 | |
d7cdf816 | 1609 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) |
2722971c | 1610 | return -EINVAL; |
d7cdf816 | 1611 | |
b301f253 | 1612 | get.name[sizeof(get.name) - 1] = '\0'; |
1da177e4 | 1613 | |
2722971c | 1614 | xt_compat_lock(AF_INET); |
34bd137b | 1615 | t = xt_find_table_lock(net, AF_INET, get.name); |
eb1a6bdc | 1616 | if (t) { |
5452e425 | 1617 | const struct xt_table_info *private = t->private; |
2722971c | 1618 | struct xt_table_info info; |
2722971c | 1619 | ret = compat_table_info(private, &info); |
d7cdf816 | 1620 | if (!ret && get.size == info.size) |
2722971c | 1621 | ret = compat_copy_entries_to_user(private->size, |
4b478248 | 1622 | t, uptr->entrytable); |
d7cdf816 | 1623 | else if (!ret) |
544473c1 | 1624 | ret = -EAGAIN; |
d7cdf816 | 1625 | |
b386d9f5 | 1626 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1627 | module_put(t->me); |
1628 | xt_table_unlock(t); | |
1629 | } else | |
eb1a6bdc | 1630 | ret = -ENOENT; |
1da177e4 | 1631 | |
2722971c DM |
1632 | xt_compat_unlock(AF_INET); |
1633 | return ret; | |
1634 | } | |
1da177e4 | 1635 | |
79030ed0 PM |
1636 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1637 | ||
2722971c DM |
1638 | static int |
1639 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1640 | { | |
1641 | int ret; | |
1da177e4 | 1642 | |
52e804c6 | 1643 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
82fac054 BS |
1644 | return -EPERM; |
1645 | ||
2722971c DM |
1646 | switch (cmd) { |
1647 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1648 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1649 | break; |
1650 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1651 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1652 | break; |
1653 | default: | |
79030ed0 | 1654 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1655 | } |
1da177e4 LT |
1656 | return ret; |
1657 | } | |
2722971c | 1658 | #endif |
1da177e4 LT |
1659 | |
1660 | static int | |
9c547959 | 1661 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
1662 | { |
1663 | int ret; | |
1664 | ||
52e804c6 | 1665 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1666 | return -EPERM; |
1667 | ||
1668 | switch (cmd) { | |
1669 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1670 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1671 | break; |
1672 | ||
1673 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1674 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
1675 | break; |
1676 | ||
1677 | default: | |
1da177e4 LT |
1678 | ret = -EINVAL; |
1679 | } | |
1680 | ||
1681 | return ret; | |
1682 | } | |
1683 | ||
1684 | static int | |
1685 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1686 | { | |
1687 | int ret; | |
1688 | ||
52e804c6 | 1689 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1690 | return -EPERM; |
1691 | ||
1692 | switch (cmd) { | |
2722971c | 1693 | case IPT_SO_GET_INFO: |
3b1e0a65 | 1694 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 1695 | break; |
1da177e4 | 1696 | |
2722971c | 1697 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 1698 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 1699 | break; |
1da177e4 LT |
1700 | |
1701 | case IPT_SO_GET_REVISION_MATCH: | |
1702 | case IPT_SO_GET_REVISION_TARGET: { | |
12b00c2c | 1703 | struct xt_get_revision rev; |
2e4e6a17 | 1704 | int target; |
1da177e4 LT |
1705 | |
1706 | if (*len != sizeof(rev)) { | |
1707 | ret = -EINVAL; | |
1708 | break; | |
1709 | } | |
1710 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1711 | ret = -EFAULT; | |
1712 | break; | |
1713 | } | |
78b79876 | 1714 | rev.name[sizeof(rev.name)-1] = 0; |
1da177e4 LT |
1715 | |
1716 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 1717 | target = 1; |
1da177e4 | 1718 | else |
2e4e6a17 | 1719 | target = 0; |
1da177e4 | 1720 | |
2e4e6a17 HW |
1721 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
1722 | rev.revision, | |
1723 | target, &ret), | |
1da177e4 LT |
1724 | "ipt_%s", rev.name); |
1725 | break; | |
1726 | } | |
1727 | ||
1728 | default: | |
1da177e4 LT |
1729 | ret = -EINVAL; |
1730 | } | |
1731 | ||
1732 | return ret; | |
1733 | } | |
1734 | ||
b9e69e12 FW |
1735 | static void __ipt_unregister_table(struct net *net, struct xt_table *table) |
1736 | { | |
1737 | struct xt_table_info *private; | |
1738 | void *loc_cpu_entry; | |
1739 | struct module *table_owner = table->me; | |
1740 | struct ipt_entry *iter; | |
1741 | ||
1742 | private = xt_unregister_table(table); | |
1743 | ||
1744 | /* Decrease module usage counts and free resources */ | |
1745 | loc_cpu_entry = private->entries; | |
1746 | xt_entry_foreach(iter, loc_cpu_entry, private->size) | |
1747 | cleanup_entry(iter, net); | |
1748 | if (private->number > private->initial_entries) | |
1749 | module_put(table_owner); | |
1750 | xt_free_table_info(private); | |
1751 | } | |
1752 | ||
a67dd266 FW |
1753 | int ipt_register_table(struct net *net, const struct xt_table *table, |
1754 | const struct ipt_replace *repl, | |
1755 | const struct nf_hook_ops *ops, struct xt_table **res) | |
1da177e4 LT |
1756 | { |
1757 | int ret; | |
2e4e6a17 | 1758 | struct xt_table_info *newinfo; |
f3c5c1bf | 1759 | struct xt_table_info bootstrap = {0}; |
31836064 | 1760 | void *loc_cpu_entry; |
a98da11d | 1761 | struct xt_table *new_table; |
1da177e4 | 1762 | |
2e4e6a17 | 1763 | newinfo = xt_alloc_table_info(repl->size); |
a67dd266 FW |
1764 | if (!newinfo) |
1765 | return -ENOMEM; | |
1da177e4 | 1766 | |
482cfc31 | 1767 | loc_cpu_entry = newinfo->entries; |
31836064 | 1768 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
1da177e4 | 1769 | |
0f234214 | 1770 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
1771 | if (ret != 0) |
1772 | goto out_free; | |
1da177e4 | 1773 | |
44d34e72 | 1774 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 1775 | if (IS_ERR(new_table)) { |
44d34e72 AD |
1776 | ret = PTR_ERR(new_table); |
1777 | goto out_free; | |
1da177e4 LT |
1778 | } |
1779 | ||
b9e69e12 | 1780 | /* set res now, will see skbs right after nf_register_net_hooks */ |
a67dd266 | 1781 | WRITE_ONCE(*res, new_table); |
b9e69e12 FW |
1782 | |
1783 | ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks)); | |
1784 | if (ret != 0) { | |
1785 | __ipt_unregister_table(net, new_table); | |
1786 | *res = NULL; | |
1787 | } | |
1788 | ||
a67dd266 | 1789 | return ret; |
44d34e72 AD |
1790 | |
1791 | out_free: | |
1792 | xt_free_table_info(newinfo); | |
a67dd266 | 1793 | return ret; |
1da177e4 LT |
1794 | } |
1795 | ||
a67dd266 FW |
1796 | void ipt_unregister_table(struct net *net, struct xt_table *table, |
1797 | const struct nf_hook_ops *ops) | |
1da177e4 | 1798 | { |
b9e69e12 FW |
1799 | nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks)); |
1800 | __ipt_unregister_table(net, table); | |
1da177e4 LT |
1801 | } |
1802 | ||
1803 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 1804 | static inline bool |
1da177e4 LT |
1805 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
1806 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 1807 | bool invert) |
1da177e4 | 1808 | { |
9c547959 PM |
1809 | return ((test_type == 0xFF) || |
1810 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
1811 | ^ invert; |
1812 | } | |
1813 | ||
1d93a9cb | 1814 | static bool |
62fc8051 | 1815 | icmp_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 1816 | { |
5452e425 JE |
1817 | const struct icmphdr *ic; |
1818 | struct icmphdr _icmph; | |
f7108a20 | 1819 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
1820 | |
1821 | /* Must not be a fragment. */ | |
f7108a20 | 1822 | if (par->fragoff != 0) |
1d93a9cb | 1823 | return false; |
1da177e4 | 1824 | |
f7108a20 | 1825 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
1826 | if (ic == NULL) { |
1827 | /* We've been asked to examine this packet, and we | |
1828 | * can't. Hence, no choice but to drop. | |
1829 | */ | |
b4ba2611 | 1830 | par->hotdrop = true; |
1d93a9cb | 1831 | return false; |
1da177e4 LT |
1832 | } |
1833 | ||
1834 | return icmp_type_code_match(icmpinfo->type, | |
1835 | icmpinfo->code[0], | |
1836 | icmpinfo->code[1], | |
1837 | ic->type, ic->code, | |
1838 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
1839 | } | |
1840 | ||
b0f38452 | 1841 | static int icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 1842 | { |
9b4fce7a | 1843 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 1844 | |
1d5cd909 | 1845 | /* Must specify no unknown invflags */ |
bd414ee6 | 1846 | return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
1847 | } |
1848 | ||
4538506b JE |
1849 | static struct xt_target ipt_builtin_tg[] __read_mostly = { |
1850 | { | |
243bf6e2 | 1851 | .name = XT_STANDARD_TARGET, |
4538506b JE |
1852 | .targetsize = sizeof(int), |
1853 | .family = NFPROTO_IPV4, | |
2722971c | 1854 | #ifdef CONFIG_COMPAT |
4538506b JE |
1855 | .compatsize = sizeof(compat_int_t), |
1856 | .compat_from_user = compat_standard_from_user, | |
1857 | .compat_to_user = compat_standard_to_user, | |
2722971c | 1858 | #endif |
4538506b JE |
1859 | }, |
1860 | { | |
243bf6e2 | 1861 | .name = XT_ERROR_TARGET, |
4538506b | 1862 | .target = ipt_error, |
12b00c2c | 1863 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
1864 | .family = NFPROTO_IPV4, |
1865 | }, | |
1da177e4 LT |
1866 | }; |
1867 | ||
1868 | static struct nf_sockopt_ops ipt_sockopts = { | |
1869 | .pf = PF_INET, | |
1870 | .set_optmin = IPT_BASE_CTL, | |
1871 | .set_optmax = IPT_SO_SET_MAX+1, | |
1872 | .set = do_ipt_set_ctl, | |
2722971c DM |
1873 | #ifdef CONFIG_COMPAT |
1874 | .compat_set = compat_do_ipt_set_ctl, | |
1875 | #endif | |
1da177e4 LT |
1876 | .get_optmin = IPT_BASE_CTL, |
1877 | .get_optmax = IPT_SO_GET_MAX+1, | |
1878 | .get = do_ipt_get_ctl, | |
2722971c DM |
1879 | #ifdef CONFIG_COMPAT |
1880 | .compat_get = compat_do_ipt_get_ctl, | |
1881 | #endif | |
16fcec35 | 1882 | .owner = THIS_MODULE, |
1da177e4 LT |
1883 | }; |
1884 | ||
4538506b JE |
1885 | static struct xt_match ipt_builtin_mt[] __read_mostly = { |
1886 | { | |
1887 | .name = "icmp", | |
1888 | .match = icmp_match, | |
1889 | .matchsize = sizeof(struct ipt_icmp), | |
1890 | .checkentry = icmp_checkentry, | |
1891 | .proto = IPPROTO_ICMP, | |
1892 | .family = NFPROTO_IPV4, | |
1893 | }, | |
1da177e4 LT |
1894 | }; |
1895 | ||
3cb609d5 AD |
1896 | static int __net_init ip_tables_net_init(struct net *net) |
1897 | { | |
383ca5b8 | 1898 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
1899 | } |
1900 | ||
1901 | static void __net_exit ip_tables_net_exit(struct net *net) | |
1902 | { | |
383ca5b8 | 1903 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
1904 | } |
1905 | ||
1906 | static struct pernet_operations ip_tables_net_ops = { | |
1907 | .init = ip_tables_net_init, | |
1908 | .exit = ip_tables_net_exit, | |
1909 | }; | |
1910 | ||
65b4b4e8 | 1911 | static int __init ip_tables_init(void) |
1da177e4 LT |
1912 | { |
1913 | int ret; | |
1914 | ||
3cb609d5 | 1915 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
1916 | if (ret < 0) |
1917 | goto err1; | |
2e4e6a17 | 1918 | |
25985edc | 1919 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 1920 | ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 PM |
1921 | if (ret < 0) |
1922 | goto err2; | |
4538506b | 1923 | ret = xt_register_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 PM |
1924 | if (ret < 0) |
1925 | goto err4; | |
1da177e4 LT |
1926 | |
1927 | /* Register setsockopt */ | |
1928 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
1929 | if (ret < 0) |
1930 | goto err5; | |
1da177e4 | 1931 | |
ff67e4e4 | 1932 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 1933 | return 0; |
0eff66e6 PM |
1934 | |
1935 | err5: | |
4538506b | 1936 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 | 1937 | err4: |
4538506b | 1938 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 | 1939 | err2: |
3cb609d5 | 1940 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
1941 | err1: |
1942 | return ret; | |
1da177e4 LT |
1943 | } |
1944 | ||
65b4b4e8 | 1945 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
1946 | { |
1947 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 1948 | |
4538506b JE |
1949 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
1950 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); | |
3cb609d5 | 1951 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
1952 | } |
1953 | ||
1954 | EXPORT_SYMBOL(ipt_register_table); | |
1955 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 1956 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
1957 | module_init(ip_tables_init); |
1958 | module_exit(ip_tables_fini); |