Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Packet matching code. | |
3 | * | |
4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
2e4e6a17 | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
f229f6ce | 6 | * Copyright (C) 2006-2010 Patrick McHardy <kaber@trash.net> |
1da177e4 LT |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
1da177e4 | 11 | */ |
90e7d4ab | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
1da177e4 | 13 | #include <linux/cache.h> |
4fc268d2 | 14 | #include <linux/capability.h> |
1da177e4 LT |
15 | #include <linux/skbuff.h> |
16 | #include <linux/kmod.h> | |
17 | #include <linux/vmalloc.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/module.h> | |
1da177e4 LT |
20 | #include <linux/icmp.h> |
21 | #include <net/ip.h> | |
2722971c | 22 | #include <net/compat.h> |
1da177e4 | 23 | #include <asm/uaccess.h> |
57b47a53 | 24 | #include <linux/mutex.h> |
1da177e4 LT |
25 | #include <linux/proc_fs.h> |
26 | #include <linux/err.h> | |
c8923c6b | 27 | #include <linux/cpumask.h> |
1da177e4 | 28 | |
2e4e6a17 | 29 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 30 | #include <linux/netfilter_ipv4/ip_tables.h> |
f01ffbd6 | 31 | #include <net/netfilter/nf_log.h> |
e3eaa991 | 32 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
33 | |
34 | MODULE_LICENSE("GPL"); | |
35 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
36 | MODULE_DESCRIPTION("IPv4 packet filter"); | |
37 | ||
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 | ||
e79ec50b | 61 | #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) |
1da177e4 LT |
62 | |
63 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, | |
3666ed1c JP |
64 | IPT_INV_SRCIP) || |
65 | FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, | |
d7cdf816 | 66 | IPT_INV_DSTIP)) |
9c547959 | 67 | return false; |
1da177e4 | 68 | |
b8dfe498 | 69 | ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask); |
1da177e4 | 70 | |
d7cdf816 | 71 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) |
9c547959 | 72 | return false; |
1da177e4 | 73 | |
b8dfe498 | 74 | ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
1da177e4 | 75 | |
d7cdf816 | 76 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) |
9c547959 | 77 | return false; |
1da177e4 LT |
78 | |
79 | /* Check specific protocol */ | |
3666ed1c | 80 | if (ipinfo->proto && |
d7cdf816 | 81 | FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) |
9c547959 | 82 | return false; |
1da177e4 LT |
83 | |
84 | /* If we have a fragment rule but the packet is not a fragment | |
85 | * then we return zero */ | |
d7cdf816 | 86 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) |
9c547959 | 87 | return false; |
1da177e4 | 88 | |
9c547959 | 89 | return true; |
1da177e4 LT |
90 | } |
91 | ||
022748a9 | 92 | static bool |
1da177e4 LT |
93 | ip_checkentry(const struct ipt_ip *ip) |
94 | { | |
d7cdf816 | 95 | if (ip->flags & ~IPT_F_MASK) |
ccb79bdc | 96 | return false; |
d7cdf816 | 97 | if (ip->invflags & ~IPT_INV_MASK) |
ccb79bdc | 98 | return false; |
ccb79bdc | 99 | return true; |
1da177e4 LT |
100 | } |
101 | ||
102 | static unsigned int | |
4b560b44 | 103 | ipt_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 104 | { |
e87cc472 | 105 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
1da177e4 LT |
106 | |
107 | return NF_DROP; | |
108 | } | |
109 | ||
022748a9 | 110 | /* Performance critical */ |
1da177e4 | 111 | static inline struct ipt_entry * |
d5d1baa1 | 112 | get_entry(const void *base, unsigned int offset) |
1da177e4 LT |
113 | { |
114 | return (struct ipt_entry *)(base + offset); | |
115 | } | |
116 | ||
ba9dda3a | 117 | /* All zeroes == unconditional rule. */ |
022748a9 | 118 | /* Mildly perf critical (only if packet tracing is on) */ |
54d83fc7 | 119 | static inline bool unconditional(const struct ipt_entry *e) |
ba9dda3a | 120 | { |
47901dc2 | 121 | static const struct ipt_ip uncond; |
ba9dda3a | 122 | |
54d83fc7 FW |
123 | return e->target_offset == sizeof(struct ipt_entry) && |
124 | memcmp(&e->ip, &uncond, sizeof(uncond)) == 0; | |
e79ec50b | 125 | #undef FWINV |
ba9dda3a JK |
126 | } |
127 | ||
d5d1baa1 | 128 | /* for const-correctness */ |
87a2e70d | 129 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
130 | ipt_get_target_c(const struct ipt_entry *e) |
131 | { | |
132 | return ipt_get_target((struct ipt_entry *)e); | |
133 | } | |
134 | ||
f0165888 | 135 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
022748a9 | 136 | static const char *const hooknames[] = { |
6e23ae2a PM |
137 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
138 | [NF_INET_LOCAL_IN] = "INPUT", | |
9c547959 | 139 | [NF_INET_FORWARD] = "FORWARD", |
6e23ae2a PM |
140 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
141 | [NF_INET_POST_ROUTING] = "POSTROUTING", | |
ba9dda3a JK |
142 | }; |
143 | ||
144 | enum nf_ip_trace_comments { | |
145 | NF_IP_TRACE_COMMENT_RULE, | |
146 | NF_IP_TRACE_COMMENT_RETURN, | |
147 | NF_IP_TRACE_COMMENT_POLICY, | |
148 | }; | |
149 | ||
022748a9 | 150 | static const char *const comments[] = { |
ba9dda3a JK |
151 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
152 | [NF_IP_TRACE_COMMENT_RETURN] = "return", | |
153 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", | |
154 | }; | |
155 | ||
156 | static struct nf_loginfo trace_loginfo = { | |
157 | .type = NF_LOG_TYPE_LOG, | |
158 | .u = { | |
159 | .log = { | |
160 | .level = 4, | |
161 | .logflags = NF_LOG_MASK, | |
162 | }, | |
163 | }, | |
164 | }; | |
165 | ||
022748a9 | 166 | /* Mildly perf critical (only if packet tracing is on) */ |
ba9dda3a | 167 | static inline int |
d5d1baa1 | 168 | get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e, |
4f2f6f23 JE |
169 | const char *hookname, const char **chainname, |
170 | const char **comment, unsigned int *rulenum) | |
ba9dda3a | 171 | { |
87a2e70d | 172 | const struct xt_standard_target *t = (void *)ipt_get_target_c(s); |
ba9dda3a | 173 | |
243bf6e2 | 174 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
ba9dda3a JK |
175 | /* Head of user chain: ERROR target with chainname */ |
176 | *chainname = t->target.data; | |
177 | (*rulenum) = 0; | |
178 | } else if (s == e) { | |
179 | (*rulenum)++; | |
180 | ||
54d83fc7 | 181 | if (unconditional(s) && |
3666ed1c | 182 | strcmp(t->target.u.kernel.target->name, |
243bf6e2 | 183 | XT_STANDARD_TARGET) == 0 && |
54d83fc7 | 184 | t->verdict < 0) { |
ba9dda3a JK |
185 | /* Tail of chains: STANDARD target (return/policy) */ |
186 | *comment = *chainname == hookname | |
4f2f6f23 JE |
187 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
188 | : comments[NF_IP_TRACE_COMMENT_RETURN]; | |
ba9dda3a JK |
189 | } |
190 | return 1; | |
191 | } else | |
192 | (*rulenum)++; | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
9dff2c96 EB |
197 | static void trace_packet(struct net *net, |
198 | const struct sk_buff *skb, | |
ba9dda3a JK |
199 | unsigned int hook, |
200 | const struct net_device *in, | |
201 | const struct net_device *out, | |
ecb6f85e | 202 | const char *tablename, |
d5d1baa1 JE |
203 | const struct xt_table_info *private, |
204 | const struct ipt_entry *e) | |
ba9dda3a | 205 | { |
5452e425 | 206 | const struct ipt_entry *root; |
4f2f6f23 | 207 | const char *hookname, *chainname, *comment; |
72b2b1dd | 208 | const struct ipt_entry *iter; |
ba9dda3a JK |
209 | unsigned int rulenum = 0; |
210 | ||
482cfc31 | 211 | root = get_entry(private->entries, private->hook_entry[hook]); |
ba9dda3a | 212 | |
4f2f6f23 JE |
213 | hookname = chainname = hooknames[hook]; |
214 | comment = comments[NF_IP_TRACE_COMMENT_RULE]; | |
ba9dda3a | 215 | |
72b2b1dd JE |
216 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
217 | if (get_chainname_rulenum(iter, e, hookname, | |
218 | &chainname, &comment, &rulenum) != 0) | |
219 | break; | |
ba9dda3a | 220 | |
4017a7ee PNA |
221 | nf_log_trace(net, AF_INET, hook, skb, in, out, &trace_loginfo, |
222 | "TRACE: %s:%s:%s:%u ", | |
223 | tablename, chainname, comment, rulenum); | |
ba9dda3a JK |
224 | } |
225 | #endif | |
226 | ||
6c7941de | 227 | static inline |
98e86403 JE |
228 | struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry) |
229 | { | |
230 | return (void *)entry + entry->next_offset; | |
231 | } | |
232 | ||
1da177e4 LT |
233 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
234 | unsigned int | |
3db05fea | 235 | ipt_do_table(struct sk_buff *skb, |
1c491ba2 | 236 | const struct nf_hook_state *state, |
e60a13e0 | 237 | struct xt_table *table) |
1da177e4 | 238 | { |
6cb8ff3f | 239 | unsigned int hook = state->hook; |
1da177e4 | 240 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
5452e425 | 241 | const struct iphdr *ip; |
1da177e4 LT |
242 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
243 | unsigned int verdict = NF_DROP; | |
244 | const char *indev, *outdev; | |
d5d1baa1 | 245 | const void *table_base; |
f3c5c1bf | 246 | struct ipt_entry *e, **jumpstack; |
7814b6ec | 247 | unsigned int stackidx, cpu; |
d5d1baa1 | 248 | const struct xt_table_info *private; |
de74c169 | 249 | struct xt_action_param acpar; |
7f5c6d4f | 250 | unsigned int addend; |
1da177e4 LT |
251 | |
252 | /* Initialization */ | |
7814b6ec | 253 | stackidx = 0; |
3db05fea | 254 | ip = ip_hdr(skb); |
1c491ba2 DM |
255 | indev = state->in ? state->in->name : nulldevname; |
256 | outdev = state->out ? state->out->name : nulldevname; | |
1da177e4 LT |
257 | /* We handle fragments by dealing with the first fragment as |
258 | * if it was a normal packet. All other fragments are treated | |
259 | * normally, except that they will NEVER match rules that ask | |
260 | * things we don't know, ie. tcp syn flag or ports). If the | |
261 | * rule is also a fragment-specific rule, non-fragments won't | |
262 | * match it. */ | |
de74c169 JE |
263 | acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
264 | acpar.thoff = ip_hdrlen(skb); | |
b4ba2611 | 265 | acpar.hotdrop = false; |
156c196f | 266 | acpar.net = state->net; |
1c491ba2 DM |
267 | acpar.in = state->in; |
268 | acpar.out = state->out; | |
de74c169 JE |
269 | acpar.family = NFPROTO_IPV4; |
270 | acpar.hooknum = hook; | |
1da177e4 | 271 | |
1da177e4 | 272 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
7f5c6d4f ED |
273 | local_bh_disable(); |
274 | addend = xt_write_recseq_begin(); | |
942e4a2b | 275 | private = table->private; |
f3c5c1bf | 276 | cpu = smp_processor_id(); |
b416c144 WD |
277 | /* |
278 | * Ensure we load private-> members after we've fetched the base | |
279 | * pointer. | |
280 | */ | |
281 | smp_read_barrier_depends(); | |
482cfc31 | 282 | table_base = private->entries; |
f3c5c1bf | 283 | jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; |
7814b6ec FW |
284 | |
285 | /* Switch to alternate jumpstack if we're being invoked via TEE. | |
286 | * TEE issues XT_CONTINUE verdict on original skb so we must not | |
287 | * clobber the jumpstack. | |
288 | * | |
289 | * For recursion via REJECT or SYNPROXY the stack will be clobbered | |
290 | * but it is no problem since absolute verdict is issued by these. | |
291 | */ | |
dcebd315 FW |
292 | if (static_key_false(&xt_tee_enabled)) |
293 | jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated); | |
78454473 | 294 | |
2e4e6a17 | 295 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 296 | |
1da177e4 | 297 | do { |
87a2e70d | 298 | const struct xt_entry_target *t; |
dcea992a | 299 | const struct xt_entry_match *ematch; |
71ae0dff | 300 | struct xt_counters *counter; |
a1ff4ac8 | 301 | |
1da177e4 | 302 | IP_NF_ASSERT(e); |
a1ff4ac8 | 303 | if (!ip_packet_match(ip, indev, outdev, |
de74c169 | 304 | &e->ip, acpar.fragoff)) { |
dcea992a | 305 | no_match: |
a1ff4ac8 JE |
306 | e = ipt_next_entry(e); |
307 | continue; | |
308 | } | |
1da177e4 | 309 | |
ef53d702 | 310 | xt_ematch_foreach(ematch, e) { |
de74c169 JE |
311 | acpar.match = ematch->u.kernel.match; |
312 | acpar.matchinfo = ematch->data; | |
313 | if (!acpar.match->match(skb, &acpar)) | |
dcea992a | 314 | goto no_match; |
ef53d702 | 315 | } |
dcea992a | 316 | |
71ae0dff FW |
317 | counter = xt_get_this_cpu_counter(&e->counters); |
318 | ADD_COUNTER(*counter, skb->len, 1); | |
1da177e4 | 319 | |
a1ff4ac8 JE |
320 | t = ipt_get_target(e); |
321 | IP_NF_ASSERT(t->u.kernel.target); | |
ba9dda3a | 322 | |
f0165888 | 323 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
a1ff4ac8 JE |
324 | /* The packet is traced: log it */ |
325 | if (unlikely(skb->nf_trace)) | |
9dff2c96 EB |
326 | trace_packet(state->net, skb, hook, state->in, |
327 | state->out, table->name, private, e); | |
ba9dda3a | 328 | #endif |
a1ff4ac8 JE |
329 | /* Standard target? */ |
330 | if (!t->u.kernel.target->target) { | |
331 | int v; | |
332 | ||
87a2e70d | 333 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
334 | if (v < 0) { |
335 | /* Pop from stack? */ | |
243bf6e2 | 336 | if (v != XT_RETURN) { |
95c96174 | 337 | verdict = (unsigned int)(-v) - 1; |
a1ff4ac8 | 338 | break; |
1da177e4 | 339 | } |
7814b6ec | 340 | if (stackidx == 0) { |
f3c5c1bf JE |
341 | e = get_entry(table_base, |
342 | private->underflow[hook]); | |
f3c5c1bf | 343 | } else { |
7814b6ec | 344 | e = jumpstack[--stackidx]; |
f3c5c1bf JE |
345 | e = ipt_next_entry(e); |
346 | } | |
a1ff4ac8 JE |
347 | continue; |
348 | } | |
3666ed1c | 349 | if (table_base + v != ipt_next_entry(e) && |
d7cdf816 | 350 | !(e->ip.flags & IPT_F_GOTO)) |
7814b6ec | 351 | jumpstack[stackidx++] = e; |
1da177e4 | 352 | |
a1ff4ac8 | 353 | e = get_entry(table_base, v); |
7a6b1c46 JE |
354 | continue; |
355 | } | |
356 | ||
de74c169 JE |
357 | acpar.target = t->u.kernel.target; |
358 | acpar.targinfo = t->data; | |
bb70dfa5 | 359 | |
de74c169 | 360 | verdict = t->u.kernel.target->target(skb, &acpar); |
7a6b1c46 JE |
361 | /* Target might have changed stuff. */ |
362 | ip = ip_hdr(skb); | |
243bf6e2 | 363 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
364 | e = ipt_next_entry(e); |
365 | else | |
366 | /* Verdict */ | |
367 | break; | |
b4ba2611 | 368 | } while (!acpar.hotdrop); |
7814b6ec | 369 | |
24cebe3f IM |
370 | xt_write_recseq_end(addend); |
371 | local_bh_enable(); | |
7f5c6d4f | 372 | |
b4ba2611 | 373 | if (acpar.hotdrop) |
1da177e4 LT |
374 | return NF_DROP; |
375 | else return verdict; | |
1da177e4 LT |
376 | } |
377 | ||
36472341 FW |
378 | static bool find_jump_target(const struct xt_table_info *t, |
379 | const struct ipt_entry *target) | |
380 | { | |
381 | struct ipt_entry *iter; | |
382 | ||
383 | xt_entry_foreach(iter, t->entries, t->size) { | |
384 | if (iter == target) | |
385 | return true; | |
386 | } | |
387 | return false; | |
388 | } | |
389 | ||
1da177e4 | 390 | /* Figures out from what hook each rule can be called: returns 0 if |
98dbbfc3 | 391 | there are loops. Puts hook bitmask in comefrom. */ |
1da177e4 | 392 | static int |
98dbbfc3 | 393 | mark_source_chains(const struct xt_table_info *newinfo, |
31836064 | 394 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
395 | { |
396 | unsigned int hook; | |
397 | ||
398 | /* No recursion; use packet counter to save back ptrs (reset | |
399 | to 0 as we leave), and comefrom to save source hook bitmask */ | |
6e23ae2a | 400 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
1da177e4 | 401 | unsigned int pos = newinfo->hook_entry[hook]; |
9c547959 | 402 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
1da177e4 LT |
403 | |
404 | if (!(valid_hooks & (1 << hook))) | |
405 | continue; | |
406 | ||
407 | /* Set initial back pointer. */ | |
408 | e->counters.pcnt = pos; | |
409 | ||
410 | for (;;) { | |
87a2e70d | 411 | const struct xt_standard_target *t |
d5d1baa1 | 412 | = (void *)ipt_get_target_c(e); |
e1b4b9f3 | 413 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 414 | |
d7cdf816 | 415 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) |
1da177e4 | 416 | return 0; |
d7cdf816 | 417 | |
9c547959 | 418 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
1da177e4 LT |
419 | |
420 | /* Unconditional return/END. */ | |
54d83fc7 | 421 | if ((unconditional(e) && |
3666ed1c | 422 | (strcmp(t->target.u.user.name, |
243bf6e2 | 423 | XT_STANDARD_TARGET) == 0) && |
54d83fc7 | 424 | t->verdict < 0) || visited) { |
1da177e4 LT |
425 | unsigned int oldpos, size; |
426 | ||
1f9352ae | 427 | if ((strcmp(t->target.u.user.name, |
24cebe3f | 428 | XT_STANDARD_TARGET) == 0) && |
d7cdf816 | 429 | t->verdict < -NF_MAX_VERDICT - 1) |
74c9c0c1 | 430 | return 0; |
74c9c0c1 | 431 | |
1da177e4 LT |
432 | /* Return: backtrack through the last |
433 | big jump. */ | |
434 | do { | |
6e23ae2a | 435 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
1da177e4 LT |
436 | oldpos = pos; |
437 | pos = e->counters.pcnt; | |
438 | e->counters.pcnt = 0; | |
439 | ||
440 | /* We're at the start. */ | |
441 | if (pos == oldpos) | |
442 | goto next; | |
443 | ||
444 | e = (struct ipt_entry *) | |
31836064 | 445 | (entry0 + pos); |
1da177e4 LT |
446 | } while (oldpos == pos + e->next_offset); |
447 | ||
448 | /* Move along one */ | |
449 | size = e->next_offset; | |
450 | e = (struct ipt_entry *) | |
31836064 | 451 | (entry0 + pos + size); |
f24e230d FW |
452 | if (pos + size >= newinfo->size) |
453 | return 0; | |
1da177e4 LT |
454 | e->counters.pcnt = pos; |
455 | pos += size; | |
456 | } else { | |
457 | int newpos = t->verdict; | |
458 | ||
459 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 460 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 461 | newpos >= 0) { |
1da177e4 | 462 | /* This a jump; chase it. */ |
36472341 FW |
463 | e = (struct ipt_entry *) |
464 | (entry0 + newpos); | |
465 | if (!find_jump_target(newinfo, e)) | |
466 | return 0; | |
1da177e4 LT |
467 | } else { |
468 | /* ... this is a fallthru */ | |
469 | newpos = pos + e->next_offset; | |
f24e230d FW |
470 | if (newpos >= newinfo->size) |
471 | return 0; | |
1da177e4 LT |
472 | } |
473 | e = (struct ipt_entry *) | |
31836064 | 474 | (entry0 + newpos); |
1da177e4 LT |
475 | e->counters.pcnt = pos; |
476 | pos = newpos; | |
477 | } | |
478 | } | |
d7cdf816 | 479 | next: ; |
1da177e4 LT |
480 | } |
481 | return 1; | |
482 | } | |
483 | ||
87a2e70d | 484 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
1da177e4 | 485 | { |
6be3d859 JE |
486 | struct xt_mtdtor_param par; |
487 | ||
f54e9367 | 488 | par.net = net; |
6be3d859 JE |
489 | par.match = m->u.kernel.match; |
490 | par.matchinfo = m->data; | |
916a917d | 491 | par.family = NFPROTO_IPV4; |
6be3d859 JE |
492 | if (par.match->destroy != NULL) |
493 | par.match->destroy(&par); | |
494 | module_put(par.match->me); | |
1da177e4 LT |
495 | } |
496 | ||
022748a9 | 497 | static int |
87a2e70d | 498 | check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
a96be246 | 499 | { |
9b4fce7a | 500 | const struct ipt_ip *ip = par->entryinfo; |
a96be246 | 501 | |
9b4fce7a JE |
502 | par->match = m->u.kernel.match; |
503 | par->matchinfo = m->data; | |
504 | ||
d7cdf816 PNA |
505 | return xt_check_match(par, m->u.match_size - sizeof(*m), |
506 | ip->proto, ip->invflags & IPT_INV_PROTO); | |
a96be246 DM |
507 | } |
508 | ||
022748a9 | 509 | static int |
87a2e70d | 510 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
1da177e4 | 511 | { |
6709dbbb | 512 | struct xt_match *match; |
3cdc7c95 | 513 | int ret; |
1da177e4 | 514 | |
fd0ec0e6 JE |
515 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
516 | m->u.user.revision); | |
d7cdf816 | 517 | if (IS_ERR(match)) |
fd0ec0e6 | 518 | return PTR_ERR(match); |
1da177e4 LT |
519 | m->u.kernel.match = match; |
520 | ||
6bdb331b | 521 | ret = check_match(m, par); |
3cdc7c95 PM |
522 | if (ret) |
523 | goto err; | |
524 | ||
1da177e4 | 525 | return 0; |
3cdc7c95 PM |
526 | err: |
527 | module_put(m->u.kernel.match->me); | |
528 | return ret; | |
1da177e4 LT |
529 | } |
530 | ||
add67461 | 531 | static int check_target(struct ipt_entry *e, struct net *net, const char *name) |
a96be246 | 532 | { |
87a2e70d | 533 | struct xt_entry_target *t = ipt_get_target(e); |
af5d6dc2 | 534 | struct xt_tgchk_param par = { |
add67461 | 535 | .net = net, |
af5d6dc2 JE |
536 | .table = name, |
537 | .entryinfo = e, | |
538 | .target = t->u.kernel.target, | |
539 | .targinfo = t->data, | |
540 | .hook_mask = e->comefrom, | |
916a917d | 541 | .family = NFPROTO_IPV4, |
af5d6dc2 | 542 | }; |
a96be246 | 543 | |
d7cdf816 PNA |
544 | return xt_check_target(&par, t->u.target_size - sizeof(*t), |
545 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); | |
a96be246 | 546 | } |
1da177e4 | 547 | |
022748a9 | 548 | static int |
a83d8e8d | 549 | find_check_entry(struct ipt_entry *e, struct net *net, const char *name, |
0559518b | 550 | unsigned int size) |
1da177e4 | 551 | { |
87a2e70d | 552 | struct xt_entry_target *t; |
6709dbbb | 553 | struct xt_target *target; |
1da177e4 LT |
554 | int ret; |
555 | unsigned int j; | |
9b4fce7a | 556 | struct xt_mtchk_param mtpar; |
dcea992a | 557 | struct xt_entry_match *ematch; |
92b4423e | 558 | unsigned long pcnt; |
1da177e4 | 559 | |
92b4423e PNA |
560 | pcnt = xt_percpu_counter_alloc(); |
561 | if (IS_ERR_VALUE(pcnt)) | |
71ae0dff | 562 | return -ENOMEM; |
92b4423e | 563 | e->counters.pcnt = pcnt; |
71ae0dff | 564 | |
1da177e4 | 565 | j = 0; |
a83d8e8d | 566 | mtpar.net = net; |
9b4fce7a JE |
567 | mtpar.table = name; |
568 | mtpar.entryinfo = &e->ip; | |
569 | mtpar.hook_mask = e->comefrom; | |
916a917d | 570 | mtpar.family = NFPROTO_IPV4; |
dcea992a | 571 | xt_ematch_foreach(ematch, e) { |
6bdb331b | 572 | ret = find_check_match(ematch, &mtpar); |
dcea992a | 573 | if (ret != 0) |
6bdb331b JE |
574 | goto cleanup_matches; |
575 | ++j; | |
dcea992a | 576 | } |
1da177e4 LT |
577 | |
578 | t = ipt_get_target(e); | |
d2a7b6ba JE |
579 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
580 | t->u.user.revision); | |
581 | if (IS_ERR(target)) { | |
d2a7b6ba | 582 | ret = PTR_ERR(target); |
1da177e4 LT |
583 | goto cleanup_matches; |
584 | } | |
585 | t->u.kernel.target = target; | |
586 | ||
add67461 | 587 | ret = check_target(e, net, name); |
3cdc7c95 PM |
588 | if (ret) |
589 | goto err; | |
71ae0dff | 590 | |
1da177e4 | 591 | return 0; |
3cdc7c95 PM |
592 | err: |
593 | module_put(t->u.kernel.target->me); | |
1da177e4 | 594 | cleanup_matches: |
6bdb331b JE |
595 | xt_ematch_foreach(ematch, e) { |
596 | if (j-- == 0) | |
dcea992a | 597 | break; |
6bdb331b JE |
598 | cleanup_match(ematch, net); |
599 | } | |
71ae0dff FW |
600 | |
601 | xt_percpu_counter_free(e->counters.pcnt); | |
602 | ||
1da177e4 LT |
603 | return ret; |
604 | } | |
605 | ||
d5d1baa1 | 606 | static bool check_underflow(const struct ipt_entry *e) |
e2fe35c1 | 607 | { |
87a2e70d | 608 | const struct xt_entry_target *t; |
e2fe35c1 JE |
609 | unsigned int verdict; |
610 | ||
54d83fc7 | 611 | if (!unconditional(e)) |
e2fe35c1 | 612 | return false; |
d5d1baa1 | 613 | t = ipt_get_target_c(e); |
e2fe35c1 JE |
614 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
615 | return false; | |
87a2e70d | 616 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
617 | verdict = -verdict - 1; |
618 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
619 | } | |
620 | ||
022748a9 | 621 | static int |
1da177e4 | 622 | check_entry_size_and_hooks(struct ipt_entry *e, |
2e4e6a17 | 623 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
624 | const unsigned char *base, |
625 | const unsigned char *limit, | |
1da177e4 LT |
626 | const unsigned int *hook_entries, |
627 | const unsigned int *underflows, | |
0559518b | 628 | unsigned int valid_hooks) |
1da177e4 LT |
629 | { |
630 | unsigned int h; | |
bdf533de | 631 | int err; |
1da177e4 | 632 | |
3666ed1c | 633 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 || |
6e94e0cf | 634 | (unsigned char *)e + sizeof(struct ipt_entry) >= limit || |
d7cdf816 | 635 | (unsigned char *)e + e->next_offset > limit) |
1da177e4 | 636 | return -EINVAL; |
1da177e4 LT |
637 | |
638 | if (e->next_offset | |
d7cdf816 | 639 | < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target)) |
1da177e4 | 640 | return -EINVAL; |
1da177e4 | 641 | |
aa412ba2 FW |
642 | if (!ip_checkentry(&e->ip)) |
643 | return -EINVAL; | |
644 | ||
ce683e5f FW |
645 | err = xt_check_entry_offsets(e, e->elems, e->target_offset, |
646 | e->next_offset); | |
bdf533de FW |
647 | if (err) |
648 | return err; | |
649 | ||
1da177e4 | 650 | /* Check hooks & underflows */ |
6e23ae2a | 651 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
a7d51738 JE |
652 | if (!(valid_hooks & (1 << h))) |
653 | continue; | |
1da177e4 LT |
654 | if ((unsigned char *)e - base == hook_entries[h]) |
655 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 656 | if ((unsigned char *)e - base == underflows[h]) { |
d7cdf816 | 657 | if (!check_underflow(e)) |
90e7d4ab | 658 | return -EINVAL; |
d7cdf816 | 659 | |
1da177e4 | 660 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 661 | } |
1da177e4 LT |
662 | } |
663 | ||
1da177e4 | 664 | /* Clear counters and comefrom */ |
2e4e6a17 | 665 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 666 | e->comefrom = 0; |
1da177e4 LT |
667 | return 0; |
668 | } | |
669 | ||
0559518b JE |
670 | static void |
671 | cleanup_entry(struct ipt_entry *e, struct net *net) | |
1da177e4 | 672 | { |
a2df1648 | 673 | struct xt_tgdtor_param par; |
87a2e70d | 674 | struct xt_entry_target *t; |
dcea992a | 675 | struct xt_entry_match *ematch; |
1da177e4 | 676 | |
1da177e4 | 677 | /* Cleanup all matches */ |
dcea992a | 678 | xt_ematch_foreach(ematch, e) |
6bdb331b | 679 | cleanup_match(ematch, net); |
1da177e4 | 680 | t = ipt_get_target(e); |
a2df1648 | 681 | |
add67461 | 682 | par.net = net; |
a2df1648 JE |
683 | par.target = t->u.kernel.target; |
684 | par.targinfo = t->data; | |
916a917d | 685 | par.family = NFPROTO_IPV4; |
a2df1648 JE |
686 | if (par.target->destroy != NULL) |
687 | par.target->destroy(&par); | |
688 | module_put(par.target->me); | |
71ae0dff | 689 | xt_percpu_counter_free(e->counters.pcnt); |
1da177e4 LT |
690 | } |
691 | ||
692 | /* Checks and translates the user-supplied table segment (held in | |
693 | newinfo) */ | |
694 | static int | |
0f234214 | 695 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
6c28255b | 696 | const struct ipt_replace *repl) |
1da177e4 | 697 | { |
72b2b1dd | 698 | struct ipt_entry *iter; |
1da177e4 | 699 | unsigned int i; |
72b2b1dd | 700 | int ret = 0; |
1da177e4 | 701 | |
0f234214 JE |
702 | newinfo->size = repl->size; |
703 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
704 | |
705 | /* Init all hooks to impossible value. */ | |
6e23ae2a | 706 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 LT |
707 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
708 | newinfo->underflow[i] = 0xFFFFFFFF; | |
709 | } | |
710 | ||
1da177e4 LT |
711 | i = 0; |
712 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
713 | xt_entry_foreach(iter, entry0, newinfo->size) { |
714 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
715 | entry0 + repl->size, |
716 | repl->hook_entry, | |
717 | repl->underflow, | |
718 | repl->valid_hooks); | |
72b2b1dd | 719 | if (ret != 0) |
0559518b JE |
720 | return ret; |
721 | ++i; | |
98dbbfc3 FW |
722 | if (strcmp(ipt_get_target(iter)->u.user.name, |
723 | XT_ERROR_TARGET) == 0) | |
724 | ++newinfo->stacksize; | |
72b2b1dd | 725 | } |
1da177e4 | 726 | |
d7cdf816 | 727 | if (i != repl->num_entries) |
1da177e4 | 728 | return -EINVAL; |
1da177e4 LT |
729 | |
730 | /* Check hooks all assigned */ | |
6e23ae2a | 731 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1da177e4 | 732 | /* Only hooks which are valid */ |
0f234214 | 733 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 | 734 | continue; |
d7cdf816 | 735 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) |
1da177e4 | 736 | return -EINVAL; |
d7cdf816 | 737 | if (newinfo->underflow[i] == 0xFFFFFFFF) |
1da177e4 | 738 | return -EINVAL; |
1da177e4 LT |
739 | } |
740 | ||
0f234214 | 741 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
74c9c0c1 DM |
742 | return -ELOOP; |
743 | ||
1da177e4 LT |
744 | /* Finally, each sanity check must pass */ |
745 | i = 0; | |
72b2b1dd | 746 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 747 | ret = find_check_entry(iter, net, repl->name, repl->size); |
72b2b1dd JE |
748 | if (ret != 0) |
749 | break; | |
0559518b | 750 | ++i; |
72b2b1dd | 751 | } |
1da177e4 | 752 | |
74c9c0c1 | 753 | if (ret != 0) { |
0559518b JE |
754 | xt_entry_foreach(iter, entry0, newinfo->size) { |
755 | if (i-- == 0) | |
72b2b1dd | 756 | break; |
0559518b JE |
757 | cleanup_entry(iter, net); |
758 | } | |
74c9c0c1 DM |
759 | return ret; |
760 | } | |
1da177e4 | 761 | |
1da177e4 LT |
762 | return ret; |
763 | } | |
764 | ||
1da177e4 | 765 | static void |
2e4e6a17 HW |
766 | get_counters(const struct xt_table_info *t, |
767 | struct xt_counters counters[]) | |
1da177e4 | 768 | { |
72b2b1dd | 769 | struct ipt_entry *iter; |
1da177e4 LT |
770 | unsigned int cpu; |
771 | unsigned int i; | |
772 | ||
6f912042 | 773 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 774 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 775 | |
1da177e4 | 776 | i = 0; |
482cfc31 | 777 | xt_entry_foreach(iter, t->entries, t->size) { |
71ae0dff | 778 | struct xt_counters *tmp; |
83723d60 ED |
779 | u64 bcnt, pcnt; |
780 | unsigned int start; | |
781 | ||
71ae0dff | 782 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
83723d60 | 783 | do { |
7f5c6d4f | 784 | start = read_seqcount_begin(s); |
71ae0dff FW |
785 | bcnt = tmp->bcnt; |
786 | pcnt = tmp->pcnt; | |
7f5c6d4f | 787 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
788 | |
789 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
790 | ++i; /* macro does multi eval of i */ |
791 | } | |
1da177e4 | 792 | } |
78454473 SH |
793 | } |
794 | ||
d5d1baa1 | 795 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 796 | { |
2722971c | 797 | unsigned int countersize; |
2e4e6a17 | 798 | struct xt_counters *counters; |
d5d1baa1 | 799 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
800 | |
801 | /* We need atomic snapshot of counters: rest doesn't change | |
802 | (other than comefrom, which userspace doesn't care | |
803 | about). */ | |
2e4e6a17 | 804 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 805 | counters = vzalloc(countersize); |
1da177e4 LT |
806 | |
807 | if (counters == NULL) | |
942e4a2b | 808 | return ERR_PTR(-ENOMEM); |
78454473 | 809 | |
942e4a2b | 810 | get_counters(private, counters); |
1da177e4 | 811 | |
2722971c DM |
812 | return counters; |
813 | } | |
814 | ||
815 | static int | |
816 | copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 817 | const struct xt_table *table, |
2722971c DM |
818 | void __user *userptr) |
819 | { | |
820 | unsigned int off, num; | |
d5d1baa1 | 821 | const struct ipt_entry *e; |
2722971c | 822 | struct xt_counters *counters; |
5452e425 | 823 | const struct xt_table_info *private = table->private; |
2722971c | 824 | int ret = 0; |
711bdde6 | 825 | const void *loc_cpu_entry; |
2722971c DM |
826 | |
827 | counters = alloc_counters(table); | |
828 | if (IS_ERR(counters)) | |
829 | return PTR_ERR(counters); | |
830 | ||
482cfc31 | 831 | loc_cpu_entry = private->entries; |
31836064 | 832 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
1da177e4 LT |
833 | ret = -EFAULT; |
834 | goto free_counters; | |
835 | } | |
836 | ||
837 | /* FIXME: use iterator macros --RR */ | |
838 | /* ... then go back and fix counters and names */ | |
839 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
840 | unsigned int i; | |
87a2e70d JE |
841 | const struct xt_entry_match *m; |
842 | const struct xt_entry_target *t; | |
1da177e4 | 843 | |
31836064 | 844 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
845 | if (copy_to_user(userptr + off |
846 | + offsetof(struct ipt_entry, counters), | |
847 | &counters[num], | |
848 | sizeof(counters[num])) != 0) { | |
849 | ret = -EFAULT; | |
850 | goto free_counters; | |
851 | } | |
852 | ||
853 | for (i = sizeof(struct ipt_entry); | |
854 | i < e->target_offset; | |
855 | i += m->u.match_size) { | |
856 | m = (void *)e + i; | |
857 | ||
858 | if (copy_to_user(userptr + off + i | |
87a2e70d | 859 | + offsetof(struct xt_entry_match, |
1da177e4 LT |
860 | u.user.name), |
861 | m->u.kernel.match->name, | |
862 | strlen(m->u.kernel.match->name)+1) | |
863 | != 0) { | |
864 | ret = -EFAULT; | |
865 | goto free_counters; | |
866 | } | |
867 | } | |
868 | ||
d5d1baa1 | 869 | t = ipt_get_target_c(e); |
1da177e4 | 870 | if (copy_to_user(userptr + off + e->target_offset |
87a2e70d | 871 | + offsetof(struct xt_entry_target, |
1da177e4 LT |
872 | u.user.name), |
873 | t->u.kernel.target->name, | |
874 | strlen(t->u.kernel.target->name)+1) != 0) { | |
875 | ret = -EFAULT; | |
876 | goto free_counters; | |
877 | } | |
878 | } | |
879 | ||
880 | free_counters: | |
881 | vfree(counters); | |
882 | return ret; | |
883 | } | |
884 | ||
2722971c | 885 | #ifdef CONFIG_COMPAT |
739674fb | 886 | static void compat_standard_from_user(void *dst, const void *src) |
2722971c | 887 | { |
9fa492cd | 888 | int v = *(compat_int_t *)src; |
2722971c | 889 | |
9fa492cd | 890 | if (v > 0) |
b386d9f5 | 891 | v += xt_compat_calc_jump(AF_INET, v); |
9fa492cd PM |
892 | memcpy(dst, &v, sizeof(v)); |
893 | } | |
46c5ea3c | 894 | |
739674fb | 895 | static int compat_standard_to_user(void __user *dst, const void *src) |
2722971c | 896 | { |
9fa492cd | 897 | compat_int_t cv = *(int *)src; |
2722971c | 898 | |
9fa492cd | 899 | if (cv > 0) |
b386d9f5 | 900 | cv -= xt_compat_calc_jump(AF_INET, cv); |
9fa492cd | 901 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
2722971c DM |
902 | } |
903 | ||
d5d1baa1 | 904 | static int compat_calc_entry(const struct ipt_entry *e, |
4b478248 | 905 | const struct xt_table_info *info, |
d5d1baa1 | 906 | const void *base, struct xt_table_info *newinfo) |
2722971c | 907 | { |
dcea992a | 908 | const struct xt_entry_match *ematch; |
87a2e70d | 909 | const struct xt_entry_target *t; |
e5b5ef7d | 910 | unsigned int entry_offset; |
2722971c DM |
911 | int off, i, ret; |
912 | ||
30c08c41 | 913 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c | 914 | entry_offset = (void *)e - base; |
dcea992a | 915 | xt_ematch_foreach(ematch, e) |
6bdb331b | 916 | off += xt_compat_match_offset(ematch->u.kernel.match); |
d5d1baa1 | 917 | t = ipt_get_target_c(e); |
9fa492cd | 918 | off += xt_compat_target_offset(t->u.kernel.target); |
2722971c | 919 | newinfo->size -= off; |
b386d9f5 | 920 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
921 | if (ret) |
922 | return ret; | |
923 | ||
6e23ae2a | 924 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
4b478248 PM |
925 | if (info->hook_entry[i] && |
926 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) | |
2722971c | 927 | newinfo->hook_entry[i] -= off; |
4b478248 PM |
928 | if (info->underflow[i] && |
929 | (e < (struct ipt_entry *)(base + info->underflow[i]))) | |
2722971c DM |
930 | newinfo->underflow[i] -= off; |
931 | } | |
932 | return 0; | |
933 | } | |
934 | ||
259d4e41 | 935 | static int compat_table_info(const struct xt_table_info *info, |
4b478248 | 936 | struct xt_table_info *newinfo) |
2722971c | 937 | { |
72b2b1dd | 938 | struct ipt_entry *iter; |
711bdde6 | 939 | const void *loc_cpu_entry; |
0559518b | 940 | int ret; |
2722971c DM |
941 | |
942 | if (!newinfo || !info) | |
943 | return -EINVAL; | |
944 | ||
482cfc31 | 945 | /* we dont care about newinfo->entries */ |
259d4e41 ED |
946 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
947 | newinfo->initial_entries = 0; | |
482cfc31 | 948 | loc_cpu_entry = info->entries; |
255d0dc3 | 949 | xt_compat_init_offsets(AF_INET, info->number); |
72b2b1dd JE |
950 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
951 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
952 | if (ret != 0) | |
0559518b | 953 | return ret; |
72b2b1dd | 954 | } |
0559518b | 955 | return 0; |
2722971c DM |
956 | } |
957 | #endif | |
958 | ||
d5d1baa1 | 959 | static int get_info(struct net *net, void __user *user, |
6c28255b | 960 | const int *len, int compat) |
2722971c | 961 | { |
12b00c2c | 962 | char name[XT_TABLE_MAXNAMELEN]; |
e60a13e0 | 963 | struct xt_table *t; |
2722971c DM |
964 | int ret; |
965 | ||
d7cdf816 | 966 | if (*len != sizeof(struct ipt_getinfo)) |
2722971c | 967 | return -EINVAL; |
2722971c DM |
968 | |
969 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
970 | return -EFAULT; | |
971 | ||
12b00c2c | 972 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
2722971c DM |
973 | #ifdef CONFIG_COMPAT |
974 | if (compat) | |
975 | xt_compat_lock(AF_INET); | |
976 | #endif | |
34bd137b | 977 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
4b478248 | 978 | "iptable_%s", name); |
0cc8d8df | 979 | if (!IS_ERR_OR_NULL(t)) { |
2722971c | 980 | struct ipt_getinfo info; |
5452e425 | 981 | const struct xt_table_info *private = t->private; |
2722971c | 982 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
983 | struct xt_table_info tmp; |
984 | ||
2722971c | 985 | if (compat) { |
2722971c | 986 | ret = compat_table_info(private, &tmp); |
b386d9f5 | 987 | xt_compat_flush_offsets(AF_INET); |
4b478248 | 988 | private = &tmp; |
2722971c DM |
989 | } |
990 | #endif | |
b5f15ac4 | 991 | memset(&info, 0, sizeof(info)); |
2722971c DM |
992 | info.valid_hooks = t->valid_hooks; |
993 | memcpy(info.hook_entry, private->hook_entry, | |
4b478248 | 994 | sizeof(info.hook_entry)); |
2722971c | 995 | memcpy(info.underflow, private->underflow, |
4b478248 | 996 | sizeof(info.underflow)); |
2722971c DM |
997 | info.num_entries = private->number; |
998 | info.size = private->size; | |
999 | strcpy(info.name, name); | |
1000 | ||
1001 | if (copy_to_user(user, &info, *len) != 0) | |
1002 | ret = -EFAULT; | |
1003 | else | |
1004 | ret = 0; | |
1005 | ||
1006 | xt_table_unlock(t); | |
1007 | module_put(t->me); | |
1008 | } else | |
1009 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1010 | #ifdef CONFIG_COMPAT | |
1011 | if (compat) | |
1012 | xt_compat_unlock(AF_INET); | |
1013 | #endif | |
1014 | return ret; | |
1015 | } | |
1016 | ||
1017 | static int | |
d5d1baa1 JE |
1018 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
1019 | const int *len) | |
2722971c DM |
1020 | { |
1021 | int ret; | |
1022 | struct ipt_get_entries get; | |
e60a13e0 | 1023 | struct xt_table *t; |
2722971c | 1024 | |
d7cdf816 | 1025 | if (*len < sizeof(get)) |
2722971c | 1026 | return -EINVAL; |
2722971c DM |
1027 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1028 | return -EFAULT; | |
d7cdf816 | 1029 | if (*len != sizeof(struct ipt_get_entries) + get.size) |
2722971c | 1030 | return -EINVAL; |
b301f253 | 1031 | get.name[sizeof(get.name) - 1] = '\0'; |
2722971c | 1032 | |
34bd137b | 1033 | t = xt_find_table_lock(net, AF_INET, get.name); |
0cc8d8df | 1034 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1035 | const struct xt_table_info *private = t->private; |
2722971c DM |
1036 | if (get.size == private->size) |
1037 | ret = copy_entries_to_user(private->size, | |
1038 | t, uptr->entrytable); | |
d7cdf816 | 1039 | else |
544473c1 | 1040 | ret = -EAGAIN; |
d7cdf816 | 1041 | |
2722971c DM |
1042 | module_put(t->me); |
1043 | xt_table_unlock(t); | |
1044 | } else | |
1045 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1046 | ||
1047 | return ret; | |
1048 | } | |
1049 | ||
1050 | static int | |
34bd137b | 1051 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
4b478248 PM |
1052 | struct xt_table_info *newinfo, unsigned int num_counters, |
1053 | void __user *counters_ptr) | |
2722971c DM |
1054 | { |
1055 | int ret; | |
e60a13e0 | 1056 | struct xt_table *t; |
2722971c DM |
1057 | struct xt_table_info *oldinfo; |
1058 | struct xt_counters *counters; | |
72b2b1dd | 1059 | struct ipt_entry *iter; |
2722971c DM |
1060 | |
1061 | ret = 0; | |
83723d60 | 1062 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
2722971c DM |
1063 | if (!counters) { |
1064 | ret = -ENOMEM; | |
1065 | goto out; | |
1066 | } | |
1067 | ||
34bd137b | 1068 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
2722971c | 1069 | "iptable_%s", name); |
0cc8d8df | 1070 | if (IS_ERR_OR_NULL(t)) { |
2722971c DM |
1071 | ret = t ? PTR_ERR(t) : -ENOENT; |
1072 | goto free_newinfo_counters_untrans; | |
1073 | } | |
1074 | ||
1075 | /* You lied! */ | |
1076 | if (valid_hooks != t->valid_hooks) { | |
2722971c DM |
1077 | ret = -EINVAL; |
1078 | goto put_module; | |
1079 | } | |
1080 | ||
1081 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); | |
1082 | if (!oldinfo) | |
1083 | goto put_module; | |
1084 | ||
1085 | /* Update module usage count based on number of rules */ | |
2722971c DM |
1086 | if ((oldinfo->number > oldinfo->initial_entries) || |
1087 | (newinfo->number <= oldinfo->initial_entries)) | |
1088 | module_put(t->me); | |
1089 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1090 | (newinfo->number <= oldinfo->initial_entries)) | |
1091 | module_put(t->me); | |
1092 | ||
942e4a2b | 1093 | /* Get the old counters, and synchronize with replace */ |
2722971c | 1094 | get_counters(oldinfo, counters); |
942e4a2b | 1095 | |
2722971c | 1096 | /* Decrease module usage counts and free resource */ |
482cfc31 | 1097 | xt_entry_foreach(iter, oldinfo->entries, oldinfo->size) |
0559518b | 1098 | cleanup_entry(iter, net); |
72b2b1dd | 1099 | |
2722971c DM |
1100 | xt_free_table_info(oldinfo); |
1101 | if (copy_to_user(counters_ptr, counters, | |
c58dd2dd TG |
1102 | sizeof(struct xt_counters) * num_counters) != 0) { |
1103 | /* Silent error, can't fail, new table is already in place */ | |
1104 | net_warn_ratelimited("iptables: counters copy to user failed while replacing table\n"); | |
1105 | } | |
2722971c DM |
1106 | vfree(counters); |
1107 | xt_table_unlock(t); | |
1108 | return ret; | |
1109 | ||
1110 | put_module: | |
1111 | module_put(t->me); | |
1112 | xt_table_unlock(t); | |
1113 | free_newinfo_counters_untrans: | |
1114 | vfree(counters); | |
1115 | out: | |
1116 | return ret; | |
1117 | } | |
1118 | ||
1119 | static int | |
d5d1baa1 | 1120 | do_replace(struct net *net, const void __user *user, unsigned int len) |
2722971c DM |
1121 | { |
1122 | int ret; | |
1123 | struct ipt_replace tmp; | |
1124 | struct xt_table_info *newinfo; | |
1125 | void *loc_cpu_entry; | |
72b2b1dd | 1126 | struct ipt_entry *iter; |
2722971c DM |
1127 | |
1128 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1129 | return -EFAULT; | |
1130 | ||
2722971c | 1131 | /* overflow check */ |
2722971c DM |
1132 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1133 | return -ENOMEM; | |
1086bbe9 DJ |
1134 | if (tmp.num_counters == 0) |
1135 | return -EINVAL; | |
1136 | ||
78b79876 | 1137 | tmp.name[sizeof(tmp.name)-1] = 0; |
2722971c DM |
1138 | |
1139 | newinfo = xt_alloc_table_info(tmp.size); | |
1140 | if (!newinfo) | |
1141 | return -ENOMEM; | |
1142 | ||
482cfc31 | 1143 | loc_cpu_entry = newinfo->entries; |
2722971c DM |
1144 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1145 | tmp.size) != 0) { | |
1146 | ret = -EFAULT; | |
1147 | goto free_newinfo; | |
1148 | } | |
1149 | ||
0f234214 | 1150 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
2722971c DM |
1151 | if (ret != 0) |
1152 | goto free_newinfo; | |
1153 | ||
34bd137b | 1154 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1155 | tmp.num_counters, tmp.counters); |
2722971c DM |
1156 | if (ret) |
1157 | goto free_newinfo_untrans; | |
1158 | return 0; | |
1159 | ||
1160 | free_newinfo_untrans: | |
72b2b1dd | 1161 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1162 | cleanup_entry(iter, net); |
2722971c DM |
1163 | free_newinfo: |
1164 | xt_free_table_info(newinfo); | |
1165 | return ret; | |
1166 | } | |
1167 | ||
2722971c | 1168 | static int |
d5d1baa1 | 1169 | do_add_counters(struct net *net, const void __user *user, |
6c28255b | 1170 | unsigned int len, int compat) |
2722971c | 1171 | { |
482cfc31 | 1172 | unsigned int i; |
2722971c DM |
1173 | struct xt_counters_info tmp; |
1174 | struct xt_counters *paddc; | |
e60a13e0 | 1175 | struct xt_table *t; |
5452e425 | 1176 | const struct xt_table_info *private; |
2722971c | 1177 | int ret = 0; |
72b2b1dd | 1178 | struct ipt_entry *iter; |
7f5c6d4f | 1179 | unsigned int addend; |
2722971c | 1180 | |
d7591f0c FW |
1181 | paddc = xt_copy_counters_from_user(user, len, &tmp, compat); |
1182 | if (IS_ERR(paddc)) | |
1183 | return PTR_ERR(paddc); | |
2722971c | 1184 | |
d7591f0c | 1185 | t = xt_find_table_lock(net, AF_INET, tmp.name); |
0cc8d8df | 1186 | if (IS_ERR_OR_NULL(t)) { |
2722971c DM |
1187 | ret = t ? PTR_ERR(t) : -ENOENT; |
1188 | goto free; | |
1189 | } | |
1190 | ||
942e4a2b | 1191 | local_bh_disable(); |
2722971c | 1192 | private = t->private; |
d7591f0c | 1193 | if (private->number != tmp.num_counters) { |
2722971c DM |
1194 | ret = -EINVAL; |
1195 | goto unlock_up_free; | |
1196 | } | |
1197 | ||
1198 | i = 0; | |
7f5c6d4f | 1199 | addend = xt_write_recseq_begin(); |
482cfc31 | 1200 | xt_entry_foreach(iter, private->entries, private->size) { |
71ae0dff FW |
1201 | struct xt_counters *tmp; |
1202 | ||
1203 | tmp = xt_get_this_cpu_counter(&iter->counters); | |
1204 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); | |
0559518b JE |
1205 | ++i; |
1206 | } | |
7f5c6d4f | 1207 | xt_write_recseq_end(addend); |
2722971c | 1208 | unlock_up_free: |
942e4a2b | 1209 | local_bh_enable(); |
2722971c DM |
1210 | xt_table_unlock(t); |
1211 | module_put(t->me); | |
1212 | free: | |
1213 | vfree(paddc); | |
1214 | ||
1215 | return ret; | |
1216 | } | |
1217 | ||
1218 | #ifdef CONFIG_COMPAT | |
1219 | struct compat_ipt_replace { | |
12b00c2c | 1220 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1221 | u32 valid_hooks; |
1222 | u32 num_entries; | |
1223 | u32 size; | |
6e23ae2a PM |
1224 | u32 hook_entry[NF_INET_NUMHOOKS]; |
1225 | u32 underflow[NF_INET_NUMHOOKS]; | |
2722971c | 1226 | u32 num_counters; |
87a2e70d | 1227 | compat_uptr_t counters; /* struct xt_counters * */ |
2722971c DM |
1228 | struct compat_ipt_entry entries[0]; |
1229 | }; | |
1230 | ||
a18aa31b PM |
1231 | static int |
1232 | compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, | |
b0a6363c | 1233 | unsigned int *size, struct xt_counters *counters, |
0559518b | 1234 | unsigned int i) |
2722971c | 1235 | { |
87a2e70d | 1236 | struct xt_entry_target *t; |
2722971c DM |
1237 | struct compat_ipt_entry __user *ce; |
1238 | u_int16_t target_offset, next_offset; | |
1239 | compat_uint_t origsize; | |
dcea992a JE |
1240 | const struct xt_entry_match *ematch; |
1241 | int ret = 0; | |
2722971c | 1242 | |
2722971c DM |
1243 | origsize = *size; |
1244 | ce = (struct compat_ipt_entry __user *)*dstptr; | |
0559518b JE |
1245 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
1246 | copy_to_user(&ce->counters, &counters[i], | |
1247 | sizeof(counters[i])) != 0) | |
1248 | return -EFAULT; | |
a18aa31b | 1249 | |
2722971c | 1250 | *dstptr += sizeof(struct compat_ipt_entry); |
30c08c41 PM |
1251 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1252 | ||
dcea992a JE |
1253 | xt_ematch_foreach(ematch, e) { |
1254 | ret = xt_compat_match_to_user(ematch, dstptr, size); | |
1255 | if (ret != 0) | |
6bdb331b | 1256 | return ret; |
dcea992a | 1257 | } |
2722971c | 1258 | target_offset = e->target_offset - (origsize - *size); |
2722971c | 1259 | t = ipt_get_target(e); |
9fa492cd | 1260 | ret = xt_compat_target_to_user(t, dstptr, size); |
2722971c | 1261 | if (ret) |
0559518b | 1262 | return ret; |
2722971c | 1263 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1264 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1265 | put_user(next_offset, &ce->next_offset) != 0) | |
1266 | return -EFAULT; | |
2722971c | 1267 | return 0; |
2722971c DM |
1268 | } |
1269 | ||
022748a9 | 1270 | static int |
87a2e70d | 1271 | compat_find_calc_match(struct xt_entry_match *m, |
4b478248 | 1272 | const struct ipt_ip *ip, |
6bdb331b | 1273 | int *size) |
2722971c | 1274 | { |
6709dbbb | 1275 | struct xt_match *match; |
2722971c | 1276 | |
fd0ec0e6 JE |
1277 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
1278 | m->u.user.revision); | |
d7cdf816 | 1279 | if (IS_ERR(match)) |
fd0ec0e6 | 1280 | return PTR_ERR(match); |
d7cdf816 | 1281 | |
2722971c | 1282 | m->u.kernel.match = match; |
9fa492cd | 1283 | *size += xt_compat_match_offset(match); |
4c1b52bc DM |
1284 | return 0; |
1285 | } | |
1286 | ||
0559518b | 1287 | static void compat_release_entry(struct compat_ipt_entry *e) |
4c1b52bc | 1288 | { |
87a2e70d | 1289 | struct xt_entry_target *t; |
dcea992a | 1290 | struct xt_entry_match *ematch; |
4c1b52bc | 1291 | |
4c1b52bc | 1292 | /* Cleanup all matches */ |
dcea992a | 1293 | xt_ematch_foreach(ematch, e) |
6bdb331b | 1294 | module_put(ematch->u.kernel.match->me); |
73cd598d | 1295 | t = compat_ipt_get_target(e); |
4c1b52bc | 1296 | module_put(t->u.kernel.target->me); |
4c1b52bc DM |
1297 | } |
1298 | ||
022748a9 | 1299 | static int |
73cd598d | 1300 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
4b478248 PM |
1301 | struct xt_table_info *newinfo, |
1302 | unsigned int *size, | |
d5d1baa1 | 1303 | const unsigned char *base, |
09d96860 | 1304 | const unsigned char *limit) |
2722971c | 1305 | { |
dcea992a | 1306 | struct xt_entry_match *ematch; |
87a2e70d | 1307 | struct xt_entry_target *t; |
6709dbbb | 1308 | struct xt_target *target; |
e5b5ef7d | 1309 | unsigned int entry_offset; |
b0a6363c | 1310 | unsigned int j; |
09d96860 | 1311 | int ret, off; |
2722971c | 1312 | |
3666ed1c | 1313 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
6e94e0cf | 1314 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit || |
d7cdf816 | 1315 | (unsigned char *)e + e->next_offset > limit) |
2722971c | 1316 | return -EINVAL; |
2722971c DM |
1317 | |
1318 | if (e->next_offset < sizeof(struct compat_ipt_entry) + | |
d7cdf816 | 1319 | sizeof(struct compat_xt_entry_target)) |
2722971c | 1320 | return -EINVAL; |
2722971c | 1321 | |
aa412ba2 FW |
1322 | if (!ip_checkentry(&e->ip)) |
1323 | return -EINVAL; | |
1324 | ||
ce683e5f | 1325 | ret = xt_compat_check_entry_offsets(e, e->elems, |
fc1221b3 | 1326 | e->target_offset, e->next_offset); |
a96be246 DM |
1327 | if (ret) |
1328 | return ret; | |
590bdf7f | 1329 | |
30c08c41 | 1330 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
2722971c DM |
1331 | entry_offset = (void *)e - (void *)base; |
1332 | j = 0; | |
dcea992a | 1333 | xt_ematch_foreach(ematch, e) { |
7d3f843e | 1334 | ret = compat_find_calc_match(ematch, &e->ip, &off); |
dcea992a | 1335 | if (ret != 0) |
6bdb331b JE |
1336 | goto release_matches; |
1337 | ++j; | |
dcea992a | 1338 | } |
2722971c | 1339 | |
73cd598d | 1340 | t = compat_ipt_get_target(e); |
d2a7b6ba JE |
1341 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
1342 | t->u.user.revision); | |
1343 | if (IS_ERR(target)) { | |
d2a7b6ba | 1344 | ret = PTR_ERR(target); |
4c1b52bc | 1345 | goto release_matches; |
2722971c DM |
1346 | } |
1347 | t->u.kernel.target = target; | |
1348 | ||
9fa492cd | 1349 | off += xt_compat_target_offset(target); |
2722971c | 1350 | *size += off; |
b386d9f5 | 1351 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
2722971c DM |
1352 | if (ret) |
1353 | goto out; | |
1354 | ||
2722971c | 1355 | return 0; |
bec71b16 | 1356 | |
2722971c | 1357 | out: |
bec71b16 | 1358 | module_put(t->u.kernel.target->me); |
4c1b52bc | 1359 | release_matches: |
6bdb331b JE |
1360 | xt_ematch_foreach(ematch, e) { |
1361 | if (j-- == 0) | |
dcea992a | 1362 | break; |
6bdb331b JE |
1363 | module_put(ematch->u.kernel.match->me); |
1364 | } | |
2722971c DM |
1365 | return ret; |
1366 | } | |
1367 | ||
0188346f | 1368 | static void |
73cd598d | 1369 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
7d3f843e | 1370 | unsigned int *size, |
4b478248 | 1371 | struct xt_table_info *newinfo, unsigned char *base) |
2722971c | 1372 | { |
87a2e70d | 1373 | struct xt_entry_target *t; |
6709dbbb | 1374 | struct xt_target *target; |
2722971c DM |
1375 | struct ipt_entry *de; |
1376 | unsigned int origsize; | |
0188346f | 1377 | int h; |
dcea992a | 1378 | struct xt_entry_match *ematch; |
2722971c | 1379 | |
2722971c DM |
1380 | origsize = *size; |
1381 | de = (struct ipt_entry *)*dstptr; | |
1382 | memcpy(de, e, sizeof(struct ipt_entry)); | |
73cd598d | 1383 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
2722971c | 1384 | |
73cd598d | 1385 | *dstptr += sizeof(struct ipt_entry); |
30c08c41 PM |
1386 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
1387 | ||
0188346f FW |
1388 | xt_ematch_foreach(ematch, e) |
1389 | xt_compat_match_from_user(ematch, dstptr, size); | |
1390 | ||
2722971c | 1391 | de->target_offset = e->target_offset - (origsize - *size); |
73cd598d | 1392 | t = compat_ipt_get_target(e); |
2722971c | 1393 | target = t->u.kernel.target; |
9fa492cd | 1394 | xt_compat_target_from_user(t, dstptr, size); |
2722971c DM |
1395 | |
1396 | de->next_offset = e->next_offset - (origsize - *size); | |
09d96860 | 1397 | |
6e23ae2a | 1398 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
2722971c DM |
1399 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
1400 | newinfo->hook_entry[h] -= origsize - *size; | |
1401 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1402 | newinfo->underflow[h] -= origsize - *size; | |
1403 | } | |
f6677f43 DM |
1404 | } |
1405 | ||
1da177e4 | 1406 | static int |
a83d8e8d | 1407 | translate_compat_table(struct net *net, |
4b478248 PM |
1408 | struct xt_table_info **pinfo, |
1409 | void **pentry0, | |
7d3f843e | 1410 | const struct compat_ipt_replace *compatr) |
1da177e4 | 1411 | { |
920b868a | 1412 | unsigned int i, j; |
2722971c DM |
1413 | struct xt_table_info *newinfo, *info; |
1414 | void *pos, *entry0, *entry1; | |
72b2b1dd | 1415 | struct compat_ipt_entry *iter0; |
09d96860 | 1416 | struct ipt_replace repl; |
2722971c | 1417 | unsigned int size; |
0559518b | 1418 | int ret; |
1da177e4 | 1419 | |
2722971c DM |
1420 | info = *pinfo; |
1421 | entry0 = *pentry0; | |
7d3f843e FW |
1422 | size = compatr->size; |
1423 | info->number = compatr->num_entries; | |
2722971c | 1424 | |
920b868a | 1425 | j = 0; |
2722971c | 1426 | xt_compat_lock(AF_INET); |
7d3f843e | 1427 | xt_compat_init_offsets(AF_INET, compatr->num_entries); |
2722971c | 1428 | /* Walk through entries, checking offsets. */ |
7d3f843e | 1429 | xt_entry_foreach(iter0, entry0, compatr->size) { |
72b2b1dd | 1430 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
6b4ff2d7 | 1431 | entry0, |
09d96860 | 1432 | entry0 + compatr->size); |
72b2b1dd | 1433 | if (ret != 0) |
0559518b JE |
1434 | goto out_unlock; |
1435 | ++j; | |
72b2b1dd | 1436 | } |
2722971c DM |
1437 | |
1438 | ret = -EINVAL; | |
d7cdf816 | 1439 | if (j != compatr->num_entries) |
2722971c | 1440 | goto out_unlock; |
2722971c | 1441 | |
2722971c DM |
1442 | ret = -ENOMEM; |
1443 | newinfo = xt_alloc_table_info(size); | |
1444 | if (!newinfo) | |
1445 | goto out_unlock; | |
1446 | ||
7d3f843e | 1447 | newinfo->number = compatr->num_entries; |
6e23ae2a | 1448 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
09d96860 FW |
1449 | newinfo->hook_entry[i] = compatr->hook_entry[i]; |
1450 | newinfo->underflow[i] = compatr->underflow[i]; | |
2722971c | 1451 | } |
482cfc31 | 1452 | entry1 = newinfo->entries; |
2722971c | 1453 | pos = entry1; |
7d3f843e | 1454 | size = compatr->size; |
0188346f FW |
1455 | xt_entry_foreach(iter0, entry0, compatr->size) |
1456 | compat_copy_entry_from_user(iter0, &pos, &size, | |
1457 | newinfo, entry1); | |
1458 | ||
09d96860 FW |
1459 | /* all module references in entry0 are now gone. |
1460 | * entry1/newinfo contains a 64bit ruleset that looks exactly as | |
1461 | * generated by 64bit userspace. | |
1462 | * | |
1463 | * Call standard translate_table() to validate all hook_entrys, | |
1464 | * underflows, check for loops, etc. | |
1465 | */ | |
b386d9f5 | 1466 | xt_compat_flush_offsets(AF_INET); |
2722971c | 1467 | xt_compat_unlock(AF_INET); |
2722971c | 1468 | |
09d96860 | 1469 | memcpy(&repl, compatr, sizeof(*compatr)); |
2722971c | 1470 | |
09d96860 FW |
1471 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
1472 | repl.hook_entry[i] = newinfo->hook_entry[i]; | |
1473 | repl.underflow[i] = newinfo->underflow[i]; | |
4c1b52bc | 1474 | } |
f6677f43 | 1475 | |
09d96860 FW |
1476 | repl.num_counters = 0; |
1477 | repl.counters = NULL; | |
1478 | repl.size = newinfo->size; | |
1479 | ret = translate_table(net, newinfo, entry1, &repl); | |
1480 | if (ret) | |
1481 | goto free_newinfo; | |
1482 | ||
2722971c DM |
1483 | *pinfo = newinfo; |
1484 | *pentry0 = entry1; | |
1485 | xt_free_table_info(info); | |
1486 | return 0; | |
1da177e4 | 1487 | |
2722971c DM |
1488 | free_newinfo: |
1489 | xt_free_table_info(newinfo); | |
09d96860 FW |
1490 | return ret; |
1491 | out_unlock: | |
1492 | xt_compat_flush_offsets(AF_INET); | |
1493 | xt_compat_unlock(AF_INET); | |
7d3f843e | 1494 | xt_entry_foreach(iter0, entry0, compatr->size) { |
0559518b | 1495 | if (j-- == 0) |
72b2b1dd | 1496 | break; |
0559518b JE |
1497 | compat_release_entry(iter0); |
1498 | } | |
1da177e4 LT |
1499 | return ret; |
1500 | } | |
1501 | ||
1502 | static int | |
34bd137b | 1503 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
1da177e4 LT |
1504 | { |
1505 | int ret; | |
2722971c DM |
1506 | struct compat_ipt_replace tmp; |
1507 | struct xt_table_info *newinfo; | |
1508 | void *loc_cpu_entry; | |
72b2b1dd | 1509 | struct ipt_entry *iter; |
1da177e4 LT |
1510 | |
1511 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1512 | return -EFAULT; | |
1513 | ||
ee4bb818 | 1514 | /* overflow check */ |
ee4bb818 KK |
1515 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1516 | return -ENOMEM; | |
1086bbe9 DJ |
1517 | if (tmp.num_counters == 0) |
1518 | return -EINVAL; | |
1519 | ||
78b79876 | 1520 | tmp.name[sizeof(tmp.name)-1] = 0; |
ee4bb818 | 1521 | |
2e4e6a17 | 1522 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
1523 | if (!newinfo) |
1524 | return -ENOMEM; | |
1525 | ||
482cfc31 | 1526 | loc_cpu_entry = newinfo->entries; |
31836064 | 1527 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1da177e4 LT |
1528 | tmp.size) != 0) { |
1529 | ret = -EFAULT; | |
1530 | goto free_newinfo; | |
1531 | } | |
1532 | ||
7d3f843e | 1533 | ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp); |
2722971c | 1534 | if (ret != 0) |
1da177e4 | 1535 | goto free_newinfo; |
1da177e4 | 1536 | |
34bd137b | 1537 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
4b478248 | 1538 | tmp.num_counters, compat_ptr(tmp.counters)); |
2722971c DM |
1539 | if (ret) |
1540 | goto free_newinfo_untrans; | |
1541 | return 0; | |
1da177e4 | 1542 | |
2722971c | 1543 | free_newinfo_untrans: |
72b2b1dd | 1544 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1545 | cleanup_entry(iter, net); |
2722971c DM |
1546 | free_newinfo: |
1547 | xt_free_table_info(newinfo); | |
1548 | return ret; | |
1549 | } | |
1da177e4 | 1550 | |
2722971c DM |
1551 | static int |
1552 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
4b478248 | 1553 | unsigned int len) |
2722971c DM |
1554 | { |
1555 | int ret; | |
1da177e4 | 1556 | |
52e804c6 | 1557 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
2722971c | 1558 | return -EPERM; |
1da177e4 | 1559 | |
2722971c DM |
1560 | switch (cmd) { |
1561 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1562 | ret = compat_do_replace(sock_net(sk), user, len); |
2722971c | 1563 | break; |
1da177e4 | 1564 | |
2722971c | 1565 | case IPT_SO_SET_ADD_COUNTERS: |
3b1e0a65 | 1566 | ret = do_add_counters(sock_net(sk), user, len, 1); |
2722971c DM |
1567 | break; |
1568 | ||
1569 | default: | |
2722971c DM |
1570 | ret = -EINVAL; |
1571 | } | |
1da177e4 | 1572 | |
1da177e4 LT |
1573 | return ret; |
1574 | } | |
1575 | ||
4b478248 | 1576 | struct compat_ipt_get_entries { |
12b00c2c | 1577 | char name[XT_TABLE_MAXNAMELEN]; |
2722971c DM |
1578 | compat_uint_t size; |
1579 | struct compat_ipt_entry entrytable[0]; | |
1580 | }; | |
1da177e4 | 1581 | |
4b478248 PM |
1582 | static int |
1583 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, | |
1584 | void __user *userptr) | |
2722971c | 1585 | { |
2722971c | 1586 | struct xt_counters *counters; |
5452e425 | 1587 | const struct xt_table_info *private = table->private; |
2722971c DM |
1588 | void __user *pos; |
1589 | unsigned int size; | |
1590 | int ret = 0; | |
a18aa31b | 1591 | unsigned int i = 0; |
72b2b1dd | 1592 | struct ipt_entry *iter; |
1da177e4 | 1593 | |
2722971c DM |
1594 | counters = alloc_counters(table); |
1595 | if (IS_ERR(counters)) | |
1596 | return PTR_ERR(counters); | |
1597 | ||
2722971c DM |
1598 | pos = userptr; |
1599 | size = total_size; | |
482cfc31 | 1600 | xt_entry_foreach(iter, private->entries, total_size) { |
72b2b1dd | 1601 | ret = compat_copy_entry_to_user(iter, &pos, |
6b4ff2d7 | 1602 | &size, counters, i++); |
72b2b1dd JE |
1603 | if (ret != 0) |
1604 | break; | |
1605 | } | |
2722971c | 1606 | |
2722971c DM |
1607 | vfree(counters); |
1608 | return ret; | |
1da177e4 LT |
1609 | } |
1610 | ||
1611 | static int | |
34bd137b AD |
1612 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
1613 | int *len) | |
1da177e4 | 1614 | { |
2722971c DM |
1615 | int ret; |
1616 | struct compat_ipt_get_entries get; | |
e60a13e0 | 1617 | struct xt_table *t; |
1da177e4 | 1618 | |
d7cdf816 | 1619 | if (*len < sizeof(get)) |
1da177e4 LT |
1620 | return -EINVAL; |
1621 | ||
2722971c DM |
1622 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1623 | return -EFAULT; | |
1da177e4 | 1624 | |
d7cdf816 | 1625 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) |
2722971c | 1626 | return -EINVAL; |
d7cdf816 | 1627 | |
b301f253 | 1628 | get.name[sizeof(get.name) - 1] = '\0'; |
1da177e4 | 1629 | |
2722971c | 1630 | xt_compat_lock(AF_INET); |
34bd137b | 1631 | t = xt_find_table_lock(net, AF_INET, get.name); |
0cc8d8df | 1632 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1633 | const struct xt_table_info *private = t->private; |
2722971c | 1634 | struct xt_table_info info; |
2722971c | 1635 | ret = compat_table_info(private, &info); |
d7cdf816 | 1636 | if (!ret && get.size == info.size) |
2722971c | 1637 | ret = compat_copy_entries_to_user(private->size, |
4b478248 | 1638 | t, uptr->entrytable); |
d7cdf816 | 1639 | else if (!ret) |
544473c1 | 1640 | ret = -EAGAIN; |
d7cdf816 | 1641 | |
b386d9f5 | 1642 | xt_compat_flush_offsets(AF_INET); |
2722971c DM |
1643 | module_put(t->me); |
1644 | xt_table_unlock(t); | |
1645 | } else | |
1da177e4 | 1646 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1647 | |
2722971c DM |
1648 | xt_compat_unlock(AF_INET); |
1649 | return ret; | |
1650 | } | |
1da177e4 | 1651 | |
79030ed0 PM |
1652 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
1653 | ||
2722971c DM |
1654 | static int |
1655 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1656 | { | |
1657 | int ret; | |
1da177e4 | 1658 | |
52e804c6 | 1659 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
82fac054 BS |
1660 | return -EPERM; |
1661 | ||
2722971c DM |
1662 | switch (cmd) { |
1663 | case IPT_SO_GET_INFO: | |
3b1e0a65 | 1664 | ret = get_info(sock_net(sk), user, len, 1); |
2722971c DM |
1665 | break; |
1666 | case IPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1667 | ret = compat_get_entries(sock_net(sk), user, len); |
2722971c DM |
1668 | break; |
1669 | default: | |
79030ed0 | 1670 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
2722971c | 1671 | } |
1da177e4 LT |
1672 | return ret; |
1673 | } | |
2722971c | 1674 | #endif |
1da177e4 LT |
1675 | |
1676 | static int | |
9c547959 | 1677 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1da177e4 LT |
1678 | { |
1679 | int ret; | |
1680 | ||
52e804c6 | 1681 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1682 | return -EPERM; |
1683 | ||
1684 | switch (cmd) { | |
1685 | case IPT_SO_SET_REPLACE: | |
3b1e0a65 | 1686 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1687 | break; |
1688 | ||
1689 | case IPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1690 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
1691 | break; |
1692 | ||
1693 | default: | |
1da177e4 LT |
1694 | ret = -EINVAL; |
1695 | } | |
1696 | ||
1697 | return ret; | |
1698 | } | |
1699 | ||
1700 | static int | |
1701 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1702 | { | |
1703 | int ret; | |
1704 | ||
52e804c6 | 1705 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1706 | return -EPERM; |
1707 | ||
1708 | switch (cmd) { | |
2722971c | 1709 | case IPT_SO_GET_INFO: |
3b1e0a65 | 1710 | ret = get_info(sock_net(sk), user, len, 0); |
2722971c | 1711 | break; |
1da177e4 | 1712 | |
2722971c | 1713 | case IPT_SO_GET_ENTRIES: |
3b1e0a65 | 1714 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 1715 | break; |
1da177e4 LT |
1716 | |
1717 | case IPT_SO_GET_REVISION_MATCH: | |
1718 | case IPT_SO_GET_REVISION_TARGET: { | |
12b00c2c | 1719 | struct xt_get_revision rev; |
2e4e6a17 | 1720 | int target; |
1da177e4 LT |
1721 | |
1722 | if (*len != sizeof(rev)) { | |
1723 | ret = -EINVAL; | |
1724 | break; | |
1725 | } | |
1726 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1727 | ret = -EFAULT; | |
1728 | break; | |
1729 | } | |
78b79876 | 1730 | rev.name[sizeof(rev.name)-1] = 0; |
1da177e4 LT |
1731 | |
1732 | if (cmd == IPT_SO_GET_REVISION_TARGET) | |
2e4e6a17 | 1733 | target = 1; |
1da177e4 | 1734 | else |
2e4e6a17 | 1735 | target = 0; |
1da177e4 | 1736 | |
2e4e6a17 HW |
1737 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
1738 | rev.revision, | |
1739 | target, &ret), | |
1da177e4 LT |
1740 | "ipt_%s", rev.name); |
1741 | break; | |
1742 | } | |
1743 | ||
1744 | default: | |
1da177e4 LT |
1745 | ret = -EINVAL; |
1746 | } | |
1747 | ||
1748 | return ret; | |
1749 | } | |
1750 | ||
b9e69e12 FW |
1751 | static void __ipt_unregister_table(struct net *net, struct xt_table *table) |
1752 | { | |
1753 | struct xt_table_info *private; | |
1754 | void *loc_cpu_entry; | |
1755 | struct module *table_owner = table->me; | |
1756 | struct ipt_entry *iter; | |
1757 | ||
1758 | private = xt_unregister_table(table); | |
1759 | ||
1760 | /* Decrease module usage counts and free resources */ | |
1761 | loc_cpu_entry = private->entries; | |
1762 | xt_entry_foreach(iter, loc_cpu_entry, private->size) | |
1763 | cleanup_entry(iter, net); | |
1764 | if (private->number > private->initial_entries) | |
1765 | module_put(table_owner); | |
1766 | xt_free_table_info(private); | |
1767 | } | |
1768 | ||
a67dd266 FW |
1769 | int ipt_register_table(struct net *net, const struct xt_table *table, |
1770 | const struct ipt_replace *repl, | |
1771 | const struct nf_hook_ops *ops, struct xt_table **res) | |
1da177e4 LT |
1772 | { |
1773 | int ret; | |
2e4e6a17 | 1774 | struct xt_table_info *newinfo; |
f3c5c1bf | 1775 | struct xt_table_info bootstrap = {0}; |
31836064 | 1776 | void *loc_cpu_entry; |
a98da11d | 1777 | struct xt_table *new_table; |
1da177e4 | 1778 | |
2e4e6a17 | 1779 | newinfo = xt_alloc_table_info(repl->size); |
a67dd266 FW |
1780 | if (!newinfo) |
1781 | return -ENOMEM; | |
1da177e4 | 1782 | |
482cfc31 | 1783 | loc_cpu_entry = newinfo->entries; |
31836064 | 1784 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
1da177e4 | 1785 | |
0f234214 | 1786 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
1787 | if (ret != 0) |
1788 | goto out_free; | |
1da177e4 | 1789 | |
44d34e72 | 1790 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 1791 | if (IS_ERR(new_table)) { |
44d34e72 AD |
1792 | ret = PTR_ERR(new_table); |
1793 | goto out_free; | |
1da177e4 LT |
1794 | } |
1795 | ||
b9e69e12 | 1796 | /* set res now, will see skbs right after nf_register_net_hooks */ |
a67dd266 | 1797 | WRITE_ONCE(*res, new_table); |
b9e69e12 FW |
1798 | |
1799 | ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks)); | |
1800 | if (ret != 0) { | |
1801 | __ipt_unregister_table(net, new_table); | |
1802 | *res = NULL; | |
1803 | } | |
1804 | ||
a67dd266 | 1805 | return ret; |
44d34e72 AD |
1806 | |
1807 | out_free: | |
1808 | xt_free_table_info(newinfo); | |
a67dd266 | 1809 | return ret; |
1da177e4 LT |
1810 | } |
1811 | ||
a67dd266 FW |
1812 | void ipt_unregister_table(struct net *net, struct xt_table *table, |
1813 | const struct nf_hook_ops *ops) | |
1da177e4 | 1814 | { |
b9e69e12 FW |
1815 | nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks)); |
1816 | __ipt_unregister_table(net, table); | |
1da177e4 LT |
1817 | } |
1818 | ||
1819 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ | |
1d93a9cb | 1820 | static inline bool |
1da177e4 LT |
1821 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
1822 | u_int8_t type, u_int8_t code, | |
1d93a9cb | 1823 | bool invert) |
1da177e4 | 1824 | { |
9c547959 PM |
1825 | return ((test_type == 0xFF) || |
1826 | (type == test_type && code >= min_code && code <= max_code)) | |
1da177e4 LT |
1827 | ^ invert; |
1828 | } | |
1829 | ||
1d93a9cb | 1830 | static bool |
62fc8051 | 1831 | icmp_match(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 1832 | { |
5452e425 JE |
1833 | const struct icmphdr *ic; |
1834 | struct icmphdr _icmph; | |
f7108a20 | 1835 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 LT |
1836 | |
1837 | /* Must not be a fragment. */ | |
f7108a20 | 1838 | if (par->fragoff != 0) |
1d93a9cb | 1839 | return false; |
1da177e4 | 1840 | |
f7108a20 | 1841 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
1da177e4 LT |
1842 | if (ic == NULL) { |
1843 | /* We've been asked to examine this packet, and we | |
1844 | * can't. Hence, no choice but to drop. | |
1845 | */ | |
b4ba2611 | 1846 | par->hotdrop = true; |
1d93a9cb | 1847 | return false; |
1da177e4 LT |
1848 | } |
1849 | ||
1850 | return icmp_type_code_match(icmpinfo->type, | |
1851 | icmpinfo->code[0], | |
1852 | icmpinfo->code[1], | |
1853 | ic->type, ic->code, | |
1854 | !!(icmpinfo->invflags&IPT_ICMP_INV)); | |
1855 | } | |
1856 | ||
b0f38452 | 1857 | static int icmp_checkentry(const struct xt_mtchk_param *par) |
1da177e4 | 1858 | { |
9b4fce7a | 1859 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
1da177e4 | 1860 | |
1d5cd909 | 1861 | /* Must specify no unknown invflags */ |
bd414ee6 | 1862 | return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0; |
1da177e4 LT |
1863 | } |
1864 | ||
4538506b JE |
1865 | static struct xt_target ipt_builtin_tg[] __read_mostly = { |
1866 | { | |
243bf6e2 | 1867 | .name = XT_STANDARD_TARGET, |
4538506b JE |
1868 | .targetsize = sizeof(int), |
1869 | .family = NFPROTO_IPV4, | |
2722971c | 1870 | #ifdef CONFIG_COMPAT |
4538506b JE |
1871 | .compatsize = sizeof(compat_int_t), |
1872 | .compat_from_user = compat_standard_from_user, | |
1873 | .compat_to_user = compat_standard_to_user, | |
2722971c | 1874 | #endif |
4538506b JE |
1875 | }, |
1876 | { | |
243bf6e2 | 1877 | .name = XT_ERROR_TARGET, |
4538506b | 1878 | .target = ipt_error, |
12b00c2c | 1879 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
1880 | .family = NFPROTO_IPV4, |
1881 | }, | |
1da177e4 LT |
1882 | }; |
1883 | ||
1884 | static struct nf_sockopt_ops ipt_sockopts = { | |
1885 | .pf = PF_INET, | |
1886 | .set_optmin = IPT_BASE_CTL, | |
1887 | .set_optmax = IPT_SO_SET_MAX+1, | |
1888 | .set = do_ipt_set_ctl, | |
2722971c DM |
1889 | #ifdef CONFIG_COMPAT |
1890 | .compat_set = compat_do_ipt_set_ctl, | |
1891 | #endif | |
1da177e4 LT |
1892 | .get_optmin = IPT_BASE_CTL, |
1893 | .get_optmax = IPT_SO_GET_MAX+1, | |
1894 | .get = do_ipt_get_ctl, | |
2722971c DM |
1895 | #ifdef CONFIG_COMPAT |
1896 | .compat_get = compat_do_ipt_get_ctl, | |
1897 | #endif | |
16fcec35 | 1898 | .owner = THIS_MODULE, |
1da177e4 LT |
1899 | }; |
1900 | ||
4538506b JE |
1901 | static struct xt_match ipt_builtin_mt[] __read_mostly = { |
1902 | { | |
1903 | .name = "icmp", | |
1904 | .match = icmp_match, | |
1905 | .matchsize = sizeof(struct ipt_icmp), | |
1906 | .checkentry = icmp_checkentry, | |
1907 | .proto = IPPROTO_ICMP, | |
1908 | .family = NFPROTO_IPV4, | |
1909 | }, | |
1da177e4 LT |
1910 | }; |
1911 | ||
3cb609d5 AD |
1912 | static int __net_init ip_tables_net_init(struct net *net) |
1913 | { | |
383ca5b8 | 1914 | return xt_proto_init(net, NFPROTO_IPV4); |
3cb609d5 AD |
1915 | } |
1916 | ||
1917 | static void __net_exit ip_tables_net_exit(struct net *net) | |
1918 | { | |
383ca5b8 | 1919 | xt_proto_fini(net, NFPROTO_IPV4); |
3cb609d5 AD |
1920 | } |
1921 | ||
1922 | static struct pernet_operations ip_tables_net_ops = { | |
1923 | .init = ip_tables_net_init, | |
1924 | .exit = ip_tables_net_exit, | |
1925 | }; | |
1926 | ||
65b4b4e8 | 1927 | static int __init ip_tables_init(void) |
1da177e4 LT |
1928 | { |
1929 | int ret; | |
1930 | ||
3cb609d5 | 1931 | ret = register_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
1932 | if (ret < 0) |
1933 | goto err1; | |
2e4e6a17 | 1934 | |
25985edc | 1935 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 1936 | ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 PM |
1937 | if (ret < 0) |
1938 | goto err2; | |
4538506b | 1939 | ret = xt_register_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 PM |
1940 | if (ret < 0) |
1941 | goto err4; | |
1da177e4 LT |
1942 | |
1943 | /* Register setsockopt */ | |
1944 | ret = nf_register_sockopt(&ipt_sockopts); | |
0eff66e6 PM |
1945 | if (ret < 0) |
1946 | goto err5; | |
1da177e4 | 1947 | |
ff67e4e4 | 1948 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
1da177e4 | 1949 | return 0; |
0eff66e6 PM |
1950 | |
1951 | err5: | |
4538506b | 1952 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
0eff66e6 | 1953 | err4: |
4538506b | 1954 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); |
0eff66e6 | 1955 | err2: |
3cb609d5 | 1956 | unregister_pernet_subsys(&ip_tables_net_ops); |
0eff66e6 PM |
1957 | err1: |
1958 | return ret; | |
1da177e4 LT |
1959 | } |
1960 | ||
65b4b4e8 | 1961 | static void __exit ip_tables_fini(void) |
1da177e4 LT |
1962 | { |
1963 | nf_unregister_sockopt(&ipt_sockopts); | |
2e4e6a17 | 1964 | |
4538506b JE |
1965 | xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt)); |
1966 | xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg)); | |
3cb609d5 | 1967 | unregister_pernet_subsys(&ip_tables_net_ops); |
1da177e4 LT |
1968 | } |
1969 | ||
1970 | EXPORT_SYMBOL(ipt_register_table); | |
1971 | EXPORT_SYMBOL(ipt_unregister_table); | |
1da177e4 | 1972 | EXPORT_SYMBOL(ipt_do_table); |
65b4b4e8 AM |
1973 | module_init(ip_tables_init); |
1974 | module_exit(ip_tables_fini); |