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Commit | Line | Data |
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a3ad434a | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Packet matching code for ARP packets. | |
4 | * | |
5 | * Based heavily, if not almost entirely, upon ip_tables.c framework. | |
6 | * | |
7 | * Some ARP specific bits are: | |
8 | * | |
9 | * Copyright (C) 2002 David S. Miller (davem@redhat.com) | |
f229f6ce | 10 | * Copyright (C) 2006-2009 Patrick McHardy <kaber@trash.net> |
1da177e4 LT |
11 | * |
12 | */ | |
90e7d4ab | 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
1da177e4 LT |
14 | #include <linux/kernel.h> |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/netdevice.h> | |
4fc268d2 | 17 | #include <linux/capability.h> |
1da177e4 LT |
18 | #include <linux/if_arp.h> |
19 | #include <linux/kmod.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/proc_fs.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/init.h> | |
57b47a53 | 24 | #include <linux/mutex.h> |
d6a2ba07 PM |
25 | #include <linux/err.h> |
26 | #include <net/compat.h> | |
79df341a | 27 | #include <net/sock.h> |
7c0f6ba6 | 28 | #include <linux/uaccess.h> |
1da177e4 | 29 | |
2e4e6a17 | 30 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 31 | #include <linux/netfilter_arp/arp_tables.h> |
e3eaa991 | 32 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
33 | |
34 | MODULE_LICENSE("GPL"); | |
35 | MODULE_AUTHOR("David S. Miller <davem@redhat.com>"); | |
36 | MODULE_DESCRIPTION("arptables core"); | |
37 | ||
e3eaa991 JE |
38 | void *arpt_alloc_initial_table(const struct xt_table *info) |
39 | { | |
40 | return xt_alloc_initial_table(arpt, ARPT); | |
41 | } | |
42 | EXPORT_SYMBOL_GPL(arpt_alloc_initial_table); | |
43 | ||
1da177e4 | 44 | static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap, |
5452e425 | 45 | const char *hdr_addr, int len) |
1da177e4 LT |
46 | { |
47 | int i, ret; | |
48 | ||
49 | if (len > ARPT_DEV_ADDR_LEN_MAX) | |
50 | len = ARPT_DEV_ADDR_LEN_MAX; | |
51 | ||
52 | ret = 0; | |
53 | for (i = 0; i < len; i++) | |
54 | ret |= (hdr_addr[i] ^ ap->addr[i]) & ap->mask[i]; | |
55 | ||
a02cec21 | 56 | return ret != 0; |
1da177e4 LT |
57 | } |
58 | ||
ddc214c4 | 59 | /* |
25985edc | 60 | * Unfortunately, _b and _mask are not aligned to an int (or long int) |
ddc214c4 | 61 | * Some arches dont care, unrolling the loop is a win on them. |
35c7f6de | 62 | * For other arches, we only have a 16bit alignement. |
ddc214c4 ED |
63 | */ |
64 | static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask) | |
65 | { | |
66 | #ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS | |
b8dfe498 | 67 | unsigned long ret = ifname_compare_aligned(_a, _b, _mask); |
ddc214c4 ED |
68 | #else |
69 | unsigned long ret = 0; | |
35c7f6de ED |
70 | const u16 *a = (const u16 *)_a; |
71 | const u16 *b = (const u16 *)_b; | |
72 | const u16 *mask = (const u16 *)_mask; | |
ddc214c4 ED |
73 | int i; |
74 | ||
35c7f6de ED |
75 | for (i = 0; i < IFNAMSIZ/sizeof(u16); i++) |
76 | ret |= (a[i] ^ b[i]) & mask[i]; | |
ddc214c4 ED |
77 | #endif |
78 | return ret; | |
79 | } | |
80 | ||
1da177e4 LT |
81 | /* Returns whether packet matches rule or not. */ |
82 | static inline int arp_packet_match(const struct arphdr *arphdr, | |
83 | struct net_device *dev, | |
84 | const char *indev, | |
85 | const char *outdev, | |
86 | const struct arpt_arp *arpinfo) | |
87 | { | |
5452e425 JE |
88 | const char *arpptr = (char *)(arphdr + 1); |
89 | const char *src_devaddr, *tgt_devaddr; | |
59b8bfd8 | 90 | __be32 src_ipaddr, tgt_ipaddr; |
ddc214c4 | 91 | long ret; |
1da177e4 | 92 | |
c37a2dfa JP |
93 | if (NF_INVF(arpinfo, ARPT_INV_ARPOP, |
94 | (arphdr->ar_op & arpinfo->arpop_mask) != arpinfo->arpop)) | |
1da177e4 | 95 | return 0; |
1da177e4 | 96 | |
c37a2dfa JP |
97 | if (NF_INVF(arpinfo, ARPT_INV_ARPHRD, |
98 | (arphdr->ar_hrd & arpinfo->arhrd_mask) != arpinfo->arhrd)) | |
1da177e4 | 99 | return 0; |
1da177e4 | 100 | |
c37a2dfa JP |
101 | if (NF_INVF(arpinfo, ARPT_INV_ARPPRO, |
102 | (arphdr->ar_pro & arpinfo->arpro_mask) != arpinfo->arpro)) | |
1da177e4 | 103 | return 0; |
1da177e4 | 104 | |
c37a2dfa JP |
105 | if (NF_INVF(arpinfo, ARPT_INV_ARPHLN, |
106 | (arphdr->ar_hln & arpinfo->arhln_mask) != arpinfo->arhln)) | |
1da177e4 | 107 | return 0; |
1da177e4 LT |
108 | |
109 | src_devaddr = arpptr; | |
110 | arpptr += dev->addr_len; | |
111 | memcpy(&src_ipaddr, arpptr, sizeof(u32)); | |
112 | arpptr += sizeof(u32); | |
113 | tgt_devaddr = arpptr; | |
114 | arpptr += dev->addr_len; | |
115 | memcpy(&tgt_ipaddr, arpptr, sizeof(u32)); | |
116 | ||
c37a2dfa JP |
117 | if (NF_INVF(arpinfo, ARPT_INV_SRCDEVADDR, |
118 | arp_devaddr_compare(&arpinfo->src_devaddr, src_devaddr, | |
119 | dev->addr_len)) || | |
120 | NF_INVF(arpinfo, ARPT_INV_TGTDEVADDR, | |
121 | arp_devaddr_compare(&arpinfo->tgt_devaddr, tgt_devaddr, | |
122 | dev->addr_len))) | |
1da177e4 | 123 | return 0; |
1da177e4 | 124 | |
c37a2dfa JP |
125 | if (NF_INVF(arpinfo, ARPT_INV_SRCIP, |
126 | (src_ipaddr & arpinfo->smsk.s_addr) != arpinfo->src.s_addr) || | |
127 | NF_INVF(arpinfo, ARPT_INV_TGTIP, | |
128 | (tgt_ipaddr & arpinfo->tmsk.s_addr) != arpinfo->tgt.s_addr)) | |
1da177e4 | 129 | return 0; |
1da177e4 LT |
130 | |
131 | /* Look for ifname matches. */ | |
ddc214c4 | 132 | ret = ifname_compare(indev, arpinfo->iniface, arpinfo->iniface_mask); |
1da177e4 | 133 | |
c37a2dfa | 134 | if (NF_INVF(arpinfo, ARPT_INV_VIA_IN, ret != 0)) |
1da177e4 | 135 | return 0; |
1da177e4 | 136 | |
ddc214c4 | 137 | ret = ifname_compare(outdev, arpinfo->outiface, arpinfo->outiface_mask); |
1da177e4 | 138 | |
c37a2dfa | 139 | if (NF_INVF(arpinfo, ARPT_INV_VIA_OUT, ret != 0)) |
1da177e4 | 140 | return 0; |
1da177e4 LT |
141 | |
142 | return 1; | |
143 | } | |
144 | ||
145 | static inline int arp_checkentry(const struct arpt_arp *arp) | |
146 | { | |
d7cdf816 | 147 | if (arp->flags & ~ARPT_F_MASK) |
1da177e4 | 148 | return 0; |
d7cdf816 | 149 | if (arp->invflags & ~ARPT_INV_MASK) |
1da177e4 | 150 | return 0; |
1da177e4 LT |
151 | |
152 | return 1; | |
153 | } | |
154 | ||
7eb35586 | 155 | static unsigned int |
4b560b44 | 156 | arpt_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 157 | { |
e87cc472 JP |
158 | net_err_ratelimited("arp_tables: error: '%s'\n", |
159 | (const char *)par->targinfo); | |
1da177e4 LT |
160 | |
161 | return NF_DROP; | |
162 | } | |
163 | ||
87a2e70d | 164 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
165 | arpt_get_target_c(const struct arpt_entry *e) |
166 | { | |
167 | return arpt_get_target((struct arpt_entry *)e); | |
168 | } | |
169 | ||
170 | static inline struct arpt_entry * | |
171 | get_entry(const void *base, unsigned int offset) | |
1da177e4 LT |
172 | { |
173 | return (struct arpt_entry *)(base + offset); | |
174 | } | |
175 | ||
6c7941de | 176 | static inline |
98e86403 JE |
177 | struct arpt_entry *arpt_next_entry(const struct arpt_entry *entry) |
178 | { | |
179 | return (void *)entry + entry->next_offset; | |
180 | } | |
181 | ||
e8d225b6 FW |
182 | unsigned int arpt_do_table(void *priv, |
183 | struct sk_buff *skb, | |
184 | const struct nf_hook_state *state) | |
1da177e4 | 185 | { |
e8d225b6 | 186 | const struct xt_table *table = priv; |
6cb8ff3f | 187 | unsigned int hook = state->hook; |
ddc214c4 | 188 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 | 189 | unsigned int verdict = NF_DROP; |
5452e425 | 190 | const struct arphdr *arp; |
3bd22997 | 191 | struct arpt_entry *e, **jumpstack; |
1da177e4 | 192 | const char *indev, *outdev; |
711bdde6 | 193 | const void *table_base; |
3bd22997 | 194 | unsigned int cpu, stackidx = 0; |
5452e425 | 195 | const struct xt_table_info *private; |
de74c169 | 196 | struct xt_action_param acpar; |
7f5c6d4f | 197 | unsigned int addend; |
1da177e4 | 198 | |
988b7050 | 199 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
1da177e4 LT |
200 | return NF_DROP; |
201 | ||
b85c3dc9 DM |
202 | indev = state->in ? state->in->name : nulldevname; |
203 | outdev = state->out ? state->out->name : nulldevname; | |
1da177e4 | 204 | |
7f5c6d4f ED |
205 | local_bh_disable(); |
206 | addend = xt_write_recseq_begin(); | |
d3d40f23 | 207 | private = READ_ONCE(table->private); /* Address dependency. */ |
3bd22997 | 208 | cpu = smp_processor_id(); |
482cfc31 | 209 | table_base = private->entries; |
3bd22997 | 210 | jumpstack = (struct arpt_entry **)private->jumpstack[cpu]; |
78454473 | 211 | |
7814b6ec FW |
212 | /* No TEE support for arptables, so no need to switch to alternate |
213 | * stack. All targets that reenter must return absolute verdicts. | |
214 | */ | |
2e4e6a17 | 215 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 216 | |
613dbd95 | 217 | acpar.state = state; |
b4ba2611 | 218 | acpar.hotdrop = false; |
7eb35586 | 219 | |
3db05fea | 220 | arp = arp_hdr(skb); |
1da177e4 | 221 | do { |
87a2e70d | 222 | const struct xt_entry_target *t; |
71ae0dff | 223 | struct xt_counters *counter; |
a1ff4ac8 JE |
224 | |
225 | if (!arp_packet_match(arp, skb->dev, indev, outdev, &e->arp)) { | |
226 | e = arpt_next_entry(e); | |
227 | continue; | |
228 | } | |
229 | ||
71ae0dff FW |
230 | counter = xt_get_this_cpu_counter(&e->counters); |
231 | ADD_COUNTER(*counter, arp_hdr_len(skb->dev), 1); | |
1da177e4 | 232 | |
d5d1baa1 | 233 | t = arpt_get_target_c(e); |
a1ff4ac8 JE |
234 | |
235 | /* Standard target? */ | |
236 | if (!t->u.kernel.target->target) { | |
237 | int v; | |
238 | ||
87a2e70d | 239 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
240 | if (v < 0) { |
241 | /* Pop from stack? */ | |
243bf6e2 | 242 | if (v != XT_RETURN) { |
95c96174 | 243 | verdict = (unsigned int)(-v) - 1; |
1da177e4 | 244 | break; |
a1ff4ac8 | 245 | } |
3bd22997 FW |
246 | if (stackidx == 0) { |
247 | e = get_entry(table_base, | |
248 | private->underflow[hook]); | |
249 | } else { | |
250 | e = jumpstack[--stackidx]; | |
251 | e = arpt_next_entry(e); | |
252 | } | |
a1ff4ac8 | 253 | continue; |
1da177e4 | 254 | } |
a1ff4ac8 JE |
255 | if (table_base + v |
256 | != arpt_next_entry(e)) { | |
57ebd808 FW |
257 | if (unlikely(stackidx >= private->stacksize)) { |
258 | verdict = NF_DROP; | |
259 | break; | |
260 | } | |
3bd22997 | 261 | jumpstack[stackidx++] = e; |
a1ff4ac8 JE |
262 | } |
263 | ||
264 | e = get_entry(table_base, v); | |
7a6b1c46 | 265 | continue; |
1da177e4 | 266 | } |
7a6b1c46 | 267 | |
de74c169 JE |
268 | acpar.target = t->u.kernel.target; |
269 | acpar.targinfo = t->data; | |
270 | verdict = t->u.kernel.target->target(skb, &acpar); | |
7a6b1c46 | 271 | |
9beceb54 TY |
272 | if (verdict == XT_CONTINUE) { |
273 | /* Target might have changed stuff. */ | |
274 | arp = arp_hdr(skb); | |
7a6b1c46 | 275 | e = arpt_next_entry(e); |
9beceb54 | 276 | } else { |
7a6b1c46 JE |
277 | /* Verdict */ |
278 | break; | |
9beceb54 | 279 | } |
b4ba2611 | 280 | } while (!acpar.hotdrop); |
7f5c6d4f ED |
281 | xt_write_recseq_end(addend); |
282 | local_bh_enable(); | |
1da177e4 | 283 | |
b4ba2611 | 284 | if (acpar.hotdrop) |
1da177e4 LT |
285 | return NF_DROP; |
286 | else | |
287 | return verdict; | |
288 | } | |
289 | ||
1da177e4 | 290 | /* All zeroes == unconditional rule. */ |
54d83fc7 | 291 | static inline bool unconditional(const struct arpt_entry *e) |
1da177e4 | 292 | { |
47901dc2 | 293 | static const struct arpt_arp uncond; |
1da177e4 | 294 | |
54d83fc7 FW |
295 | return e->target_offset == sizeof(struct arpt_entry) && |
296 | memcmp(&e->arp, &uncond, sizeof(uncond)) == 0; | |
1da177e4 LT |
297 | } |
298 | ||
299 | /* Figures out from what hook each rule can be called: returns 0 if | |
300 | * there are loops. Puts hook bitmask in comefrom. | |
301 | */ | |
98dbbfc3 | 302 | static int mark_source_chains(const struct xt_table_info *newinfo, |
f4dc7771 FW |
303 | unsigned int valid_hooks, void *entry0, |
304 | unsigned int *offsets) | |
1da177e4 LT |
305 | { |
306 | unsigned int hook; | |
307 | ||
308 | /* No recursion; use packet counter to save back ptrs (reset | |
309 | * to 0 as we leave), and comefrom to save source hook bitmask. | |
310 | */ | |
311 | for (hook = 0; hook < NF_ARP_NUMHOOKS; hook++) { | |
312 | unsigned int pos = newinfo->hook_entry[hook]; | |
68ad546a | 313 | struct arpt_entry *e = entry0 + pos; |
1da177e4 LT |
314 | |
315 | if (!(valid_hooks & (1 << hook))) | |
316 | continue; | |
317 | ||
318 | /* Set initial back pointer. */ | |
319 | e->counters.pcnt = pos; | |
320 | ||
321 | for (;;) { | |
87a2e70d | 322 | const struct xt_standard_target *t |
d5d1baa1 | 323 | = (void *)arpt_get_target_c(e); |
e1b4b9f3 | 324 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 325 | |
d7cdf816 | 326 | if (e->comefrom & (1 << NF_ARP_NUMHOOKS)) |
1da177e4 | 327 | return 0; |
d7cdf816 | 328 | |
1da177e4 LT |
329 | e->comefrom |
330 | |= ((1 << hook) | (1 << NF_ARP_NUMHOOKS)); | |
331 | ||
332 | /* Unconditional return/END. */ | |
54d83fc7 | 333 | if ((unconditional(e) && |
3666ed1c | 334 | (strcmp(t->target.u.user.name, |
243bf6e2 | 335 | XT_STANDARD_TARGET) == 0) && |
54d83fc7 | 336 | t->verdict < 0) || visited) { |
1da177e4 LT |
337 | unsigned int oldpos, size; |
338 | ||
339 | /* Return: backtrack through the last | |
340 | * big jump. | |
341 | */ | |
342 | do { | |
343 | e->comefrom ^= (1<<NF_ARP_NUMHOOKS); | |
344 | oldpos = pos; | |
345 | pos = e->counters.pcnt; | |
346 | e->counters.pcnt = 0; | |
347 | ||
348 | /* We're at the start. */ | |
349 | if (pos == oldpos) | |
350 | goto next; | |
351 | ||
68ad546a | 352 | e = entry0 + pos; |
1da177e4 LT |
353 | } while (oldpos == pos + e->next_offset); |
354 | ||
355 | /* Move along one */ | |
356 | size = e->next_offset; | |
68ad546a | 357 | e = entry0 + pos + size; |
f24e230d FW |
358 | if (pos + size >= newinfo->size) |
359 | return 0; | |
1da177e4 LT |
360 | e->counters.pcnt = pos; |
361 | pos += size; | |
362 | } else { | |
363 | int newpos = t->verdict; | |
364 | ||
365 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 366 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 367 | newpos >= 0) { |
1da177e4 | 368 | /* This a jump; chase it. */ |
f4dc7771 FW |
369 | if (!xt_find_jump_offset(offsets, newpos, |
370 | newinfo->number)) | |
371 | return 0; | |
1da177e4 LT |
372 | } else { |
373 | /* ... this is a fallthru */ | |
374 | newpos = pos + e->next_offset; | |
f24e230d FW |
375 | if (newpos >= newinfo->size) |
376 | return 0; | |
1da177e4 | 377 | } |
68ad546a | 378 | e = entry0 + newpos; |
1da177e4 LT |
379 | e->counters.pcnt = pos; |
380 | pos = newpos; | |
381 | } | |
382 | } | |
d7cdf816 | 383 | next: ; |
1da177e4 LT |
384 | } |
385 | return 1; | |
386 | } | |
387 | ||
1b789577 | 388 | static int check_target(struct arpt_entry *e, struct net *net, const char *name) |
fb5b6095 | 389 | { |
87a2e70d | 390 | struct xt_entry_target *t = arpt_get_target(e); |
af5d6dc2 | 391 | struct xt_tgchk_param par = { |
1b789577 | 392 | .net = net, |
af5d6dc2 JE |
393 | .table = name, |
394 | .entryinfo = e, | |
395 | .target = t->u.kernel.target, | |
396 | .targinfo = t->data, | |
397 | .hook_mask = e->comefrom, | |
916a917d | 398 | .family = NFPROTO_ARP, |
af5d6dc2 JE |
399 | }; |
400 | ||
d7cdf816 | 401 | return xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false); |
fb5b6095 PM |
402 | } |
403 | ||
1b789577 FW |
404 | static int |
405 | find_check_entry(struct arpt_entry *e, struct net *net, const char *name, | |
406 | unsigned int size, | |
ae0ac0ed | 407 | struct xt_percpu_counter_alloc_state *alloc_state) |
fb5b6095 | 408 | { |
87a2e70d | 409 | struct xt_entry_target *t; |
95eea855 | 410 | struct xt_target *target; |
fb5b6095 PM |
411 | int ret; |
412 | ||
ae0ac0ed | 413 | if (!xt_percpu_counter_alloc(alloc_state, &e->counters)) |
71ae0dff FW |
414 | return -ENOMEM; |
415 | ||
fb5b6095 | 416 | t = arpt_get_target(e); |
d2a7b6ba JE |
417 | target = xt_request_find_target(NFPROTO_ARP, t->u.user.name, |
418 | t->u.user.revision); | |
419 | if (IS_ERR(target)) { | |
d2a7b6ba | 420 | ret = PTR_ERR(target); |
1da177e4 LT |
421 | goto out; |
422 | } | |
1da177e4 | 423 | t->u.kernel.target = target; |
1da177e4 | 424 | |
1b789577 | 425 | ret = check_target(e, net, name); |
3cdc7c95 PM |
426 | if (ret) |
427 | goto err; | |
1da177e4 | 428 | return 0; |
3cdc7c95 PM |
429 | err: |
430 | module_put(t->u.kernel.target->me); | |
1da177e4 | 431 | out: |
4d31eef5 | 432 | xt_percpu_counter_free(&e->counters); |
71ae0dff | 433 | |
1da177e4 LT |
434 | return ret; |
435 | } | |
436 | ||
d5d1baa1 | 437 | static bool check_underflow(const struct arpt_entry *e) |
e2fe35c1 | 438 | { |
87a2e70d | 439 | const struct xt_entry_target *t; |
e2fe35c1 JE |
440 | unsigned int verdict; |
441 | ||
54d83fc7 | 442 | if (!unconditional(e)) |
e2fe35c1 | 443 | return false; |
d5d1baa1 | 444 | t = arpt_get_target_c(e); |
e2fe35c1 JE |
445 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
446 | return false; | |
87a2e70d | 447 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
448 | verdict = -verdict - 1; |
449 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
450 | } | |
451 | ||
1da177e4 | 452 | static inline int check_entry_size_and_hooks(struct arpt_entry *e, |
2e4e6a17 | 453 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
454 | const unsigned char *base, |
455 | const unsigned char *limit, | |
1da177e4 LT |
456 | const unsigned int *hook_entries, |
457 | const unsigned int *underflows, | |
0559518b | 458 | unsigned int valid_hooks) |
1da177e4 LT |
459 | { |
460 | unsigned int h; | |
bdf533de | 461 | int err; |
1da177e4 | 462 | |
3666ed1c | 463 | if ((unsigned long)e % __alignof__(struct arpt_entry) != 0 || |
6e94e0cf | 464 | (unsigned char *)e + sizeof(struct arpt_entry) >= limit || |
d7cdf816 | 465 | (unsigned char *)e + e->next_offset > limit) |
1da177e4 | 466 | return -EINVAL; |
1da177e4 LT |
467 | |
468 | if (e->next_offset | |
d7cdf816 | 469 | < sizeof(struct arpt_entry) + sizeof(struct xt_entry_target)) |
1da177e4 | 470 | return -EINVAL; |
1da177e4 | 471 | |
aa412ba2 FW |
472 | if (!arp_checkentry(&e->arp)) |
473 | return -EINVAL; | |
474 | ||
ce683e5f FW |
475 | err = xt_check_entry_offsets(e, e->elems, e->target_offset, |
476 | e->next_offset); | |
bdf533de FW |
477 | if (err) |
478 | return err; | |
479 | ||
1da177e4 LT |
480 | /* Check hooks & underflows */ |
481 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { | |
a7d51738 JE |
482 | if (!(valid_hooks & (1 << h))) |
483 | continue; | |
1da177e4 LT |
484 | if ((unsigned char *)e - base == hook_entries[h]) |
485 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 486 | if ((unsigned char *)e - base == underflows[h]) { |
d7cdf816 | 487 | if (!check_underflow(e)) |
90e7d4ab | 488 | return -EINVAL; |
d7cdf816 | 489 | |
1da177e4 | 490 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 491 | } |
1da177e4 LT |
492 | } |
493 | ||
1da177e4 | 494 | /* Clear counters and comefrom */ |
2e4e6a17 | 495 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 496 | e->comefrom = 0; |
1da177e4 LT |
497 | return 0; |
498 | } | |
499 | ||
212e7f56 | 500 | static void cleanup_entry(struct arpt_entry *e, struct net *net) |
1da177e4 | 501 | { |
a2df1648 | 502 | struct xt_tgdtor_param par; |
87a2e70d | 503 | struct xt_entry_target *t; |
1da177e4 | 504 | |
1da177e4 | 505 | t = arpt_get_target(e); |
212e7f56 | 506 | par.net = net; |
a2df1648 JE |
507 | par.target = t->u.kernel.target; |
508 | par.targinfo = t->data; | |
916a917d | 509 | par.family = NFPROTO_ARP; |
a2df1648 JE |
510 | if (par.target->destroy != NULL) |
511 | par.target->destroy(&par); | |
512 | module_put(par.target->me); | |
4d31eef5 | 513 | xt_percpu_counter_free(&e->counters); |
1da177e4 LT |
514 | } |
515 | ||
516 | /* Checks and translates the user-supplied table segment (held in | |
517 | * newinfo). | |
518 | */ | |
1b789577 FW |
519 | static int translate_table(struct net *net, |
520 | struct xt_table_info *newinfo, | |
521 | void *entry0, | |
6c28255b | 522 | const struct arpt_replace *repl) |
1da177e4 | 523 | { |
ae0ac0ed | 524 | struct xt_percpu_counter_alloc_state alloc_state = { 0 }; |
72b2b1dd | 525 | struct arpt_entry *iter; |
f4dc7771 | 526 | unsigned int *offsets; |
1da177e4 | 527 | unsigned int i; |
72b2b1dd | 528 | int ret = 0; |
1da177e4 | 529 | |
0f234214 JE |
530 | newinfo->size = repl->size; |
531 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
532 | |
533 | /* Init all hooks to impossible value. */ | |
534 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
535 | newinfo->hook_entry[i] = 0xFFFFFFFF; | |
536 | newinfo->underflow[i] = 0xFFFFFFFF; | |
537 | } | |
538 | ||
f4dc7771 FW |
539 | offsets = xt_alloc_entry_offsets(newinfo->number); |
540 | if (!offsets) | |
541 | return -ENOMEM; | |
1da177e4 LT |
542 | i = 0; |
543 | ||
544 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
545 | xt_entry_foreach(iter, entry0, newinfo->size) { |
546 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
547 | entry0 + repl->size, |
548 | repl->hook_entry, | |
549 | repl->underflow, | |
550 | repl->valid_hooks); | |
72b2b1dd | 551 | if (ret != 0) |
f4dc7771 FW |
552 | goto out_free; |
553 | if (i < repl->num_entries) | |
554 | offsets[i] = (void *)iter - entry0; | |
0559518b | 555 | ++i; |
98dbbfc3 FW |
556 | if (strcmp(arpt_get_target(iter)->u.user.name, |
557 | XT_ERROR_TARGET) == 0) | |
558 | ++newinfo->stacksize; | |
72b2b1dd | 559 | } |
1da177e4 | 560 | |
f4dc7771 | 561 | ret = -EINVAL; |
d7cdf816 | 562 | if (i != repl->num_entries) |
f4dc7771 | 563 | goto out_free; |
1da177e4 | 564 | |
1b293e30 FW |
565 | ret = xt_check_table_hooks(newinfo, repl->valid_hooks); |
566 | if (ret) | |
567 | goto out_free; | |
1da177e4 | 568 | |
f4dc7771 FW |
569 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) { |
570 | ret = -ELOOP; | |
571 | goto out_free; | |
572 | } | |
573 | kvfree(offsets); | |
74c9c0c1 | 574 | |
1da177e4 LT |
575 | /* Finally, each sanity check must pass */ |
576 | i = 0; | |
72b2b1dd | 577 | xt_entry_foreach(iter, entry0, newinfo->size) { |
1b789577 | 578 | ret = find_check_entry(iter, net, repl->name, repl->size, |
ae0ac0ed | 579 | &alloc_state); |
72b2b1dd JE |
580 | if (ret != 0) |
581 | break; | |
0559518b | 582 | ++i; |
72b2b1dd | 583 | } |
1da177e4 | 584 | |
74c9c0c1 | 585 | if (ret != 0) { |
0559518b JE |
586 | xt_entry_foreach(iter, entry0, newinfo->size) { |
587 | if (i-- == 0) | |
72b2b1dd | 588 | break; |
212e7f56 | 589 | cleanup_entry(iter, net); |
0559518b | 590 | } |
74c9c0c1 | 591 | return ret; |
1da177e4 LT |
592 | } |
593 | ||
f4dc7771 FW |
594 | return ret; |
595 | out_free: | |
596 | kvfree(offsets); | |
1da177e4 LT |
597 | return ret; |
598 | } | |
599 | ||
2e4e6a17 HW |
600 | static void get_counters(const struct xt_table_info *t, |
601 | struct xt_counters counters[]) | |
1da177e4 | 602 | { |
72b2b1dd | 603 | struct arpt_entry *iter; |
1da177e4 LT |
604 | unsigned int cpu; |
605 | unsigned int i; | |
606 | ||
6f912042 | 607 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 608 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 609 | |
1da177e4 | 610 | i = 0; |
482cfc31 | 611 | xt_entry_foreach(iter, t->entries, t->size) { |
71ae0dff | 612 | struct xt_counters *tmp; |
83723d60 ED |
613 | u64 bcnt, pcnt; |
614 | unsigned int start; | |
615 | ||
71ae0dff | 616 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
83723d60 | 617 | do { |
7f5c6d4f | 618 | start = read_seqcount_begin(s); |
71ae0dff FW |
619 | bcnt = tmp->bcnt; |
620 | pcnt = tmp->pcnt; | |
7f5c6d4f | 621 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
622 | |
623 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b | 624 | ++i; |
a5d7a714 | 625 | cond_resched(); |
0559518b | 626 | } |
1da177e4 | 627 | } |
78454473 SH |
628 | } |
629 | ||
d13e7b2e FW |
630 | static void get_old_counters(const struct xt_table_info *t, |
631 | struct xt_counters counters[]) | |
632 | { | |
633 | struct arpt_entry *iter; | |
634 | unsigned int cpu, i; | |
635 | ||
636 | for_each_possible_cpu(cpu) { | |
637 | i = 0; | |
638 | xt_entry_foreach(iter, t->entries, t->size) { | |
639 | struct xt_counters *tmp; | |
640 | ||
641 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); | |
642 | ADD_COUNTER(counters[i], tmp->bcnt, tmp->pcnt); | |
643 | ++i; | |
644 | } | |
645 | cond_resched(); | |
646 | } | |
647 | } | |
648 | ||
d5d1baa1 | 649 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 650 | { |
27e2c26b | 651 | unsigned int countersize; |
2e4e6a17 | 652 | struct xt_counters *counters; |
d3d40f23 | 653 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
654 | |
655 | /* We need atomic snapshot of counters: rest doesn't change | |
656 | * (other than comefrom, which userspace doesn't care | |
657 | * about). | |
658 | */ | |
2e4e6a17 | 659 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 660 | counters = vzalloc(countersize); |
1da177e4 LT |
661 | |
662 | if (counters == NULL) | |
942e4a2b | 663 | return ERR_PTR(-ENOMEM); |
78454473 | 664 | |
942e4a2b | 665 | get_counters(private, counters); |
1da177e4 | 666 | |
27e2c26b PM |
667 | return counters; |
668 | } | |
669 | ||
670 | static int copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 671 | const struct xt_table *table, |
27e2c26b PM |
672 | void __user *userptr) |
673 | { | |
674 | unsigned int off, num; | |
d5d1baa1 | 675 | const struct arpt_entry *e; |
27e2c26b | 676 | struct xt_counters *counters; |
d3d40f23 | 677 | struct xt_table_info *private = table->private; |
27e2c26b PM |
678 | int ret = 0; |
679 | void *loc_cpu_entry; | |
680 | ||
681 | counters = alloc_counters(table); | |
682 | if (IS_ERR(counters)) | |
683 | return PTR_ERR(counters); | |
684 | ||
482cfc31 | 685 | loc_cpu_entry = private->entries; |
1da177e4 LT |
686 | |
687 | /* FIXME: use iterator macros --RR */ | |
688 | /* ... then go back and fix counters and names */ | |
689 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
87a2e70d | 690 | const struct xt_entry_target *t; |
1da177e4 | 691 | |
68ad546a | 692 | e = loc_cpu_entry + off; |
244b531b WB |
693 | if (copy_to_user(userptr + off, e, sizeof(*e))) { |
694 | ret = -EFAULT; | |
695 | goto free_counters; | |
696 | } | |
1da177e4 LT |
697 | if (copy_to_user(userptr + off |
698 | + offsetof(struct arpt_entry, counters), | |
699 | &counters[num], | |
700 | sizeof(counters[num])) != 0) { | |
701 | ret = -EFAULT; | |
702 | goto free_counters; | |
703 | } | |
704 | ||
d5d1baa1 | 705 | t = arpt_get_target_c(e); |
244b531b | 706 | if (xt_target_to_user(t, userptr + off + e->target_offset)) { |
1da177e4 LT |
707 | ret = -EFAULT; |
708 | goto free_counters; | |
709 | } | |
710 | } | |
711 | ||
712 | free_counters: | |
713 | vfree(counters); | |
714 | return ret; | |
715 | } | |
716 | ||
47a6959f | 717 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
739674fb | 718 | static void compat_standard_from_user(void *dst, const void *src) |
d6a2ba07 PM |
719 | { |
720 | int v = *(compat_int_t *)src; | |
721 | ||
722 | if (v > 0) | |
ee999d8b | 723 | v += xt_compat_calc_jump(NFPROTO_ARP, v); |
d6a2ba07 PM |
724 | memcpy(dst, &v, sizeof(v)); |
725 | } | |
726 | ||
739674fb | 727 | static int compat_standard_to_user(void __user *dst, const void *src) |
d6a2ba07 PM |
728 | { |
729 | compat_int_t cv = *(int *)src; | |
730 | ||
731 | if (cv > 0) | |
ee999d8b | 732 | cv -= xt_compat_calc_jump(NFPROTO_ARP, cv); |
d6a2ba07 PM |
733 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
734 | } | |
735 | ||
d5d1baa1 | 736 | static int compat_calc_entry(const struct arpt_entry *e, |
d6a2ba07 | 737 | const struct xt_table_info *info, |
d5d1baa1 | 738 | const void *base, struct xt_table_info *newinfo) |
d6a2ba07 | 739 | { |
87a2e70d | 740 | const struct xt_entry_target *t; |
d6a2ba07 PM |
741 | unsigned int entry_offset; |
742 | int off, i, ret; | |
743 | ||
744 | off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
745 | entry_offset = (void *)e - base; | |
746 | ||
d5d1baa1 | 747 | t = arpt_get_target_c(e); |
d6a2ba07 PM |
748 | off += xt_compat_target_offset(t->u.kernel.target); |
749 | newinfo->size -= off; | |
ee999d8b | 750 | ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off); |
d6a2ba07 PM |
751 | if (ret) |
752 | return ret; | |
753 | ||
754 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
755 | if (info->hook_entry[i] && | |
756 | (e < (struct arpt_entry *)(base + info->hook_entry[i]))) | |
757 | newinfo->hook_entry[i] -= off; | |
758 | if (info->underflow[i] && | |
759 | (e < (struct arpt_entry *)(base + info->underflow[i]))) | |
760 | newinfo->underflow[i] -= off; | |
761 | } | |
762 | return 0; | |
763 | } | |
764 | ||
765 | static int compat_table_info(const struct xt_table_info *info, | |
766 | struct xt_table_info *newinfo) | |
767 | { | |
72b2b1dd | 768 | struct arpt_entry *iter; |
711bdde6 | 769 | const void *loc_cpu_entry; |
0559518b | 770 | int ret; |
d6a2ba07 PM |
771 | |
772 | if (!newinfo || !info) | |
773 | return -EINVAL; | |
774 | ||
482cfc31 | 775 | /* we dont care about newinfo->entries */ |
d6a2ba07 PM |
776 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
777 | newinfo->initial_entries = 0; | |
482cfc31 | 778 | loc_cpu_entry = info->entries; |
9782a11e FW |
779 | ret = xt_compat_init_offsets(NFPROTO_ARP, info->number); |
780 | if (ret) | |
781 | return ret; | |
72b2b1dd JE |
782 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
783 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
784 | if (ret != 0) | |
0559518b | 785 | return ret; |
72b2b1dd | 786 | } |
0559518b | 787 | return 0; |
d6a2ba07 PM |
788 | } |
789 | #endif | |
790 | ||
983094b4 | 791 | static int get_info(struct net *net, void __user *user, const int *len) |
41acd975 | 792 | { |
12b00c2c | 793 | char name[XT_TABLE_MAXNAMELEN]; |
4abff077 | 794 | struct xt_table *t; |
41acd975 PM |
795 | int ret; |
796 | ||
d7cdf816 | 797 | if (*len != sizeof(struct arpt_getinfo)) |
41acd975 | 798 | return -EINVAL; |
41acd975 PM |
799 | |
800 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
801 | return -EFAULT; | |
802 | ||
12b00c2c | 803 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
47a6959f | 804 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
983094b4 | 805 | if (in_compat_syscall()) |
ee999d8b | 806 | xt_compat_lock(NFPROTO_ARP); |
d6a2ba07 | 807 | #endif |
03d13b68 FW |
808 | t = xt_request_find_table_lock(net, NFPROTO_ARP, name); |
809 | if (!IS_ERR(t)) { | |
41acd975 | 810 | struct arpt_getinfo info; |
d3d40f23 | 811 | const struct xt_table_info *private = t->private; |
47a6959f | 812 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
14c7dbe0 AD |
813 | struct xt_table_info tmp; |
814 | ||
983094b4 | 815 | if (in_compat_syscall()) { |
d6a2ba07 | 816 | ret = compat_table_info(private, &tmp); |
ee999d8b | 817 | xt_compat_flush_offsets(NFPROTO_ARP); |
d6a2ba07 PM |
818 | private = &tmp; |
819 | } | |
820 | #endif | |
1a8b7a67 | 821 | memset(&info, 0, sizeof(info)); |
41acd975 PM |
822 | info.valid_hooks = t->valid_hooks; |
823 | memcpy(info.hook_entry, private->hook_entry, | |
824 | sizeof(info.hook_entry)); | |
825 | memcpy(info.underflow, private->underflow, | |
826 | sizeof(info.underflow)); | |
827 | info.num_entries = private->number; | |
828 | info.size = private->size; | |
829 | strcpy(info.name, name); | |
830 | ||
831 | if (copy_to_user(user, &info, *len) != 0) | |
832 | ret = -EFAULT; | |
833 | else | |
834 | ret = 0; | |
835 | xt_table_unlock(t); | |
836 | module_put(t->me); | |
837 | } else | |
03d13b68 | 838 | ret = PTR_ERR(t); |
47a6959f | 839 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
983094b4 | 840 | if (in_compat_syscall()) |
ee999d8b | 841 | xt_compat_unlock(NFPROTO_ARP); |
d6a2ba07 | 842 | #endif |
41acd975 PM |
843 | return ret; |
844 | } | |
845 | ||
79df341a | 846 | static int get_entries(struct net *net, struct arpt_get_entries __user *uptr, |
d5d1baa1 | 847 | const int *len) |
1da177e4 LT |
848 | { |
849 | int ret; | |
11f6dff8 | 850 | struct arpt_get_entries get; |
4abff077 | 851 | struct xt_table *t; |
1da177e4 | 852 | |
d7cdf816 | 853 | if (*len < sizeof(get)) |
11f6dff8 | 854 | return -EINVAL; |
11f6dff8 PM |
855 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
856 | return -EFAULT; | |
d7cdf816 | 857 | if (*len != sizeof(struct arpt_get_entries) + get.size) |
11f6dff8 | 858 | return -EINVAL; |
d7cdf816 | 859 | |
b301f253 | 860 | get.name[sizeof(get.name) - 1] = '\0'; |
11f6dff8 | 861 | |
ee999d8b | 862 | t = xt_find_table_lock(net, NFPROTO_ARP, get.name); |
03d13b68 | 863 | if (!IS_ERR(t)) { |
d3d40f23 | 864 | const struct xt_table_info *private = t->private; |
5452e425 | 865 | |
11f6dff8 | 866 | if (get.size == private->size) |
2e4e6a17 | 867 | ret = copy_entries_to_user(private->size, |
1da177e4 | 868 | t, uptr->entrytable); |
d7cdf816 | 869 | else |
544473c1 | 870 | ret = -EAGAIN; |
d7cdf816 | 871 | |
6b7d31fc | 872 | module_put(t->me); |
2e4e6a17 | 873 | xt_table_unlock(t); |
1da177e4 | 874 | } else |
03d13b68 | 875 | ret = PTR_ERR(t); |
1da177e4 LT |
876 | |
877 | return ret; | |
878 | } | |
879 | ||
79df341a AD |
880 | static int __do_replace(struct net *net, const char *name, |
881 | unsigned int valid_hooks, | |
d6a2ba07 PM |
882 | struct xt_table_info *newinfo, |
883 | unsigned int num_counters, | |
884 | void __user *counters_ptr) | |
1da177e4 LT |
885 | { |
886 | int ret; | |
4abff077 | 887 | struct xt_table *t; |
d6a2ba07 | 888 | struct xt_table_info *oldinfo; |
2e4e6a17 | 889 | struct xt_counters *counters; |
d6a2ba07 | 890 | void *loc_cpu_old_entry; |
72b2b1dd | 891 | struct arpt_entry *iter; |
1da177e4 | 892 | |
d6a2ba07 | 893 | ret = 0; |
c84ca954 | 894 | counters = xt_counters_alloc(num_counters); |
1da177e4 LT |
895 | if (!counters) { |
896 | ret = -ENOMEM; | |
d6a2ba07 | 897 | goto out; |
1da177e4 | 898 | } |
1da177e4 | 899 | |
03d13b68 FW |
900 | t = xt_request_find_table_lock(net, NFPROTO_ARP, name); |
901 | if (IS_ERR(t)) { | |
902 | ret = PTR_ERR(t); | |
1da177e4 | 903 | goto free_newinfo_counters_untrans; |
6b7d31fc | 904 | } |
1da177e4 LT |
905 | |
906 | /* You lied! */ | |
d6a2ba07 | 907 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 908 | ret = -EINVAL; |
6b7d31fc | 909 | goto put_module; |
1da177e4 LT |
910 | } |
911 | ||
d6a2ba07 | 912 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
913 | if (!oldinfo) |
914 | goto put_module; | |
915 | ||
916 | /* Update module usage count based on number of rules */ | |
e905a9ed YH |
917 | if ((oldinfo->number > oldinfo->initial_entries) || |
918 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
919 | module_put(t->me); |
920 | if ((oldinfo->number > oldinfo->initial_entries) && | |
921 | (newinfo->number <= oldinfo->initial_entries)) | |
922 | module_put(t->me); | |
923 | ||
f31e5f1a XL |
924 | xt_table_unlock(t); |
925 | ||
d13e7b2e | 926 | get_old_counters(oldinfo, counters); |
942e4a2b | 927 | |
1da177e4 | 928 | /* Decrease module usage counts and free resource */ |
482cfc31 | 929 | loc_cpu_old_entry = oldinfo->entries; |
72b2b1dd | 930 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
212e7f56 | 931 | cleanup_entry(iter, net); |
31836064 | 932 | |
2e4e6a17 | 933 | xt_free_table_info(oldinfo); |
d6a2ba07 | 934 | if (copy_to_user(counters_ptr, counters, |
c58dd2dd TG |
935 | sizeof(struct xt_counters) * num_counters) != 0) { |
936 | /* Silent error, can't fail, new table is already in place */ | |
937 | net_warn_ratelimited("arptables: counters copy to user failed while replacing table\n"); | |
938 | } | |
1da177e4 | 939 | vfree(counters); |
1da177e4 LT |
940 | return ret; |
941 | ||
942 | put_module: | |
943 | module_put(t->me); | |
2e4e6a17 | 944 | xt_table_unlock(t); |
1da177e4 | 945 | free_newinfo_counters_untrans: |
1da177e4 | 946 | vfree(counters); |
d6a2ba07 PM |
947 | out: |
948 | return ret; | |
949 | } | |
950 | ||
c2f12630 | 951 | static int do_replace(struct net *net, sockptr_t arg, unsigned int len) |
d6a2ba07 PM |
952 | { |
953 | int ret; | |
954 | struct arpt_replace tmp; | |
955 | struct xt_table_info *newinfo; | |
956 | void *loc_cpu_entry; | |
72b2b1dd | 957 | struct arpt_entry *iter; |
d6a2ba07 | 958 | |
c2f12630 | 959 | if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0) |
d6a2ba07 PM |
960 | return -EFAULT; |
961 | ||
962 | /* overflow check */ | |
963 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
964 | return -ENOMEM; | |
1086bbe9 DJ |
965 | if (tmp.num_counters == 0) |
966 | return -EINVAL; | |
967 | ||
42eab94f | 968 | tmp.name[sizeof(tmp.name)-1] = 0; |
d6a2ba07 PM |
969 | |
970 | newinfo = xt_alloc_table_info(tmp.size); | |
971 | if (!newinfo) | |
972 | return -ENOMEM; | |
973 | ||
482cfc31 | 974 | loc_cpu_entry = newinfo->entries; |
d3c48151 CH |
975 | if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp), |
976 | tmp.size) != 0) { | |
d6a2ba07 PM |
977 | ret = -EFAULT; |
978 | goto free_newinfo; | |
979 | } | |
980 | ||
1b789577 | 981 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
d6a2ba07 PM |
982 | if (ret != 0) |
983 | goto free_newinfo; | |
984 | ||
79df341a | 985 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
d6a2ba07 PM |
986 | tmp.num_counters, tmp.counters); |
987 | if (ret) | |
988 | goto free_newinfo_untrans; | |
989 | return 0; | |
990 | ||
991 | free_newinfo_untrans: | |
72b2b1dd | 992 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
212e7f56 | 993 | cleanup_entry(iter, net); |
1da177e4 | 994 | free_newinfo: |
2e4e6a17 | 995 | xt_free_table_info(newinfo); |
1da177e4 LT |
996 | return ret; |
997 | } | |
998 | ||
ab214d1b | 999 | static int do_add_counters(struct net *net, sockptr_t arg, unsigned int len) |
1da177e4 | 1000 | { |
482cfc31 | 1001 | unsigned int i; |
d6a2ba07 PM |
1002 | struct xt_counters_info tmp; |
1003 | struct xt_counters *paddc; | |
4abff077 | 1004 | struct xt_table *t; |
5452e425 | 1005 | const struct xt_table_info *private; |
6b7d31fc | 1006 | int ret = 0; |
72b2b1dd | 1007 | struct arpt_entry *iter; |
7f5c6d4f | 1008 | unsigned int addend; |
d6a2ba07 | 1009 | |
ab214d1b | 1010 | paddc = xt_copy_counters(arg, len, &tmp); |
d7591f0c FW |
1011 | if (IS_ERR(paddc)) |
1012 | return PTR_ERR(paddc); | |
1da177e4 | 1013 | |
d7591f0c | 1014 | t = xt_find_table_lock(net, NFPROTO_ARP, tmp.name); |
03d13b68 FW |
1015 | if (IS_ERR(t)) { |
1016 | ret = PTR_ERR(t); | |
1da177e4 | 1017 | goto free; |
6b7d31fc | 1018 | } |
1da177e4 | 1019 | |
942e4a2b | 1020 | local_bh_disable(); |
d3d40f23 | 1021 | private = t->private; |
d7591f0c | 1022 | if (private->number != tmp.num_counters) { |
1da177e4 LT |
1023 | ret = -EINVAL; |
1024 | goto unlock_up_free; | |
1025 | } | |
1026 | ||
1027 | i = 0; | |
482cfc31 | 1028 | |
7f5c6d4f | 1029 | addend = xt_write_recseq_begin(); |
482cfc31 | 1030 | xt_entry_foreach(iter, private->entries, private->size) { |
71ae0dff FW |
1031 | struct xt_counters *tmp; |
1032 | ||
1033 | tmp = xt_get_this_cpu_counter(&iter->counters); | |
1034 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); | |
0559518b JE |
1035 | ++i; |
1036 | } | |
7f5c6d4f | 1037 | xt_write_recseq_end(addend); |
1da177e4 | 1038 | unlock_up_free: |
942e4a2b | 1039 | local_bh_enable(); |
2e4e6a17 | 1040 | xt_table_unlock(t); |
6b7d31fc | 1041 | module_put(t->me); |
1da177e4 LT |
1042 | free: |
1043 | vfree(paddc); | |
1044 | ||
1045 | return ret; | |
1046 | } | |
1047 | ||
47a6959f | 1048 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
8dddd327 FW |
1049 | struct compat_arpt_replace { |
1050 | char name[XT_TABLE_MAXNAMELEN]; | |
1051 | u32 valid_hooks; | |
1052 | u32 num_entries; | |
1053 | u32 size; | |
1054 | u32 hook_entry[NF_ARP_NUMHOOKS]; | |
1055 | u32 underflow[NF_ARP_NUMHOOKS]; | |
1056 | u32 num_counters; | |
1057 | compat_uptr_t counters; | |
6daf1414 | 1058 | struct compat_arpt_entry entries[]; |
8dddd327 FW |
1059 | }; |
1060 | ||
0559518b | 1061 | static inline void compat_release_entry(struct compat_arpt_entry *e) |
d6a2ba07 | 1062 | { |
87a2e70d | 1063 | struct xt_entry_target *t; |
d6a2ba07 | 1064 | |
d6a2ba07 PM |
1065 | t = compat_arpt_get_target(e); |
1066 | module_put(t->u.kernel.target->me); | |
d6a2ba07 PM |
1067 | } |
1068 | ||
09d96860 | 1069 | static int |
d6a2ba07 PM |
1070 | check_compat_entry_size_and_hooks(struct compat_arpt_entry *e, |
1071 | struct xt_table_info *newinfo, | |
1072 | unsigned int *size, | |
d5d1baa1 | 1073 | const unsigned char *base, |
09d96860 | 1074 | const unsigned char *limit) |
d6a2ba07 | 1075 | { |
87a2e70d | 1076 | struct xt_entry_target *t; |
d6a2ba07 PM |
1077 | struct xt_target *target; |
1078 | unsigned int entry_offset; | |
09d96860 | 1079 | int ret, off; |
d6a2ba07 | 1080 | |
3666ed1c | 1081 | if ((unsigned long)e % __alignof__(struct compat_arpt_entry) != 0 || |
6e94e0cf | 1082 | (unsigned char *)e + sizeof(struct compat_arpt_entry) >= limit || |
d7cdf816 | 1083 | (unsigned char *)e + e->next_offset > limit) |
d6a2ba07 | 1084 | return -EINVAL; |
d6a2ba07 PM |
1085 | |
1086 | if (e->next_offset < sizeof(struct compat_arpt_entry) + | |
d7cdf816 | 1087 | sizeof(struct compat_xt_entry_target)) |
d6a2ba07 | 1088 | return -EINVAL; |
d6a2ba07 | 1089 | |
aa412ba2 FW |
1090 | if (!arp_checkentry(&e->arp)) |
1091 | return -EINVAL; | |
1092 | ||
ce683e5f | 1093 | ret = xt_compat_check_entry_offsets(e, e->elems, e->target_offset, |
fc1221b3 | 1094 | e->next_offset); |
d6a2ba07 PM |
1095 | if (ret) |
1096 | return ret; | |
1097 | ||
1098 | off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
1099 | entry_offset = (void *)e - (void *)base; | |
1100 | ||
1101 | t = compat_arpt_get_target(e); | |
d2a7b6ba JE |
1102 | target = xt_request_find_target(NFPROTO_ARP, t->u.user.name, |
1103 | t->u.user.revision); | |
1104 | if (IS_ERR(target)) { | |
d2a7b6ba | 1105 | ret = PTR_ERR(target); |
d6a2ba07 PM |
1106 | goto out; |
1107 | } | |
1108 | t->u.kernel.target = target; | |
1109 | ||
1110 | off += xt_compat_target_offset(target); | |
1111 | *size += off; | |
ee999d8b | 1112 | ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off); |
d6a2ba07 PM |
1113 | if (ret) |
1114 | goto release_target; | |
1115 | ||
d6a2ba07 PM |
1116 | return 0; |
1117 | ||
1118 | release_target: | |
1119 | module_put(t->u.kernel.target->me); | |
1120 | out: | |
1121 | return ret; | |
1122 | } | |
1123 | ||
0188346f | 1124 | static void |
d6a2ba07 | 1125 | compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr, |
8dddd327 | 1126 | unsigned int *size, |
d6a2ba07 PM |
1127 | struct xt_table_info *newinfo, unsigned char *base) |
1128 | { | |
87a2e70d | 1129 | struct xt_entry_target *t; |
d6a2ba07 PM |
1130 | struct arpt_entry *de; |
1131 | unsigned int origsize; | |
0188346f | 1132 | int h; |
d6a2ba07 | 1133 | |
d6a2ba07 | 1134 | origsize = *size; |
68ad546a | 1135 | de = *dstptr; |
d6a2ba07 PM |
1136 | memcpy(de, e, sizeof(struct arpt_entry)); |
1137 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1138 | ||
1139 | *dstptr += sizeof(struct arpt_entry); | |
1140 | *size += sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
1141 | ||
1142 | de->target_offset = e->target_offset - (origsize - *size); | |
1143 | t = compat_arpt_get_target(e); | |
d6a2ba07 PM |
1144 | xt_compat_target_from_user(t, dstptr, size); |
1145 | ||
1146 | de->next_offset = e->next_offset - (origsize - *size); | |
1147 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { | |
1148 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1149 | newinfo->hook_entry[h] -= origsize - *size; | |
1150 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1151 | newinfo->underflow[h] -= origsize - *size; | |
1152 | } | |
d6a2ba07 PM |
1153 | } |
1154 | ||
1b789577 FW |
1155 | static int translate_compat_table(struct net *net, |
1156 | struct xt_table_info **pinfo, | |
d6a2ba07 | 1157 | void **pentry0, |
8dddd327 | 1158 | const struct compat_arpt_replace *compatr) |
d6a2ba07 PM |
1159 | { |
1160 | unsigned int i, j; | |
1161 | struct xt_table_info *newinfo, *info; | |
1162 | void *pos, *entry0, *entry1; | |
72b2b1dd | 1163 | struct compat_arpt_entry *iter0; |
09d96860 | 1164 | struct arpt_replace repl; |
d6a2ba07 | 1165 | unsigned int size; |
9782a11e | 1166 | int ret; |
d6a2ba07 PM |
1167 | |
1168 | info = *pinfo; | |
1169 | entry0 = *pentry0; | |
8dddd327 FW |
1170 | size = compatr->size; |
1171 | info->number = compatr->num_entries; | |
d6a2ba07 | 1172 | |
d6a2ba07 | 1173 | j = 0; |
ee999d8b | 1174 | xt_compat_lock(NFPROTO_ARP); |
9782a11e FW |
1175 | ret = xt_compat_init_offsets(NFPROTO_ARP, compatr->num_entries); |
1176 | if (ret) | |
1177 | goto out_unlock; | |
d6a2ba07 | 1178 | /* Walk through entries, checking offsets. */ |
8dddd327 | 1179 | xt_entry_foreach(iter0, entry0, compatr->size) { |
72b2b1dd | 1180 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
6b4ff2d7 | 1181 | entry0, |
09d96860 | 1182 | entry0 + compatr->size); |
72b2b1dd | 1183 | if (ret != 0) |
0559518b JE |
1184 | goto out_unlock; |
1185 | ++j; | |
72b2b1dd | 1186 | } |
d6a2ba07 PM |
1187 | |
1188 | ret = -EINVAL; | |
d7cdf816 | 1189 | if (j != compatr->num_entries) |
d6a2ba07 | 1190 | goto out_unlock; |
d6a2ba07 | 1191 | |
d6a2ba07 PM |
1192 | ret = -ENOMEM; |
1193 | newinfo = xt_alloc_table_info(size); | |
1194 | if (!newinfo) | |
1195 | goto out_unlock; | |
1196 | ||
b29c457a FW |
1197 | memset(newinfo->entries, 0, size); |
1198 | ||
8dddd327 | 1199 | newinfo->number = compatr->num_entries; |
d6a2ba07 | 1200 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { |
17a49cd5 HJ |
1201 | newinfo->hook_entry[i] = compatr->hook_entry[i]; |
1202 | newinfo->underflow[i] = compatr->underflow[i]; | |
d6a2ba07 | 1203 | } |
482cfc31 | 1204 | entry1 = newinfo->entries; |
d6a2ba07 | 1205 | pos = entry1; |
8dddd327 | 1206 | size = compatr->size; |
0188346f FW |
1207 | xt_entry_foreach(iter0, entry0, compatr->size) |
1208 | compat_copy_entry_from_user(iter0, &pos, &size, | |
1209 | newinfo, entry1); | |
09d96860 FW |
1210 | |
1211 | /* all module references in entry0 are now gone */ | |
1212 | ||
ee999d8b JE |
1213 | xt_compat_flush_offsets(NFPROTO_ARP); |
1214 | xt_compat_unlock(NFPROTO_ARP); | |
d6a2ba07 | 1215 | |
09d96860 | 1216 | memcpy(&repl, compatr, sizeof(*compatr)); |
71ae0dff | 1217 | |
09d96860 FW |
1218 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { |
1219 | repl.hook_entry[i] = newinfo->hook_entry[i]; | |
1220 | repl.underflow[i] = newinfo->underflow[i]; | |
d6a2ba07 PM |
1221 | } |
1222 | ||
09d96860 FW |
1223 | repl.num_counters = 0; |
1224 | repl.counters = NULL; | |
1225 | repl.size = newinfo->size; | |
1b789577 | 1226 | ret = translate_table(net, newinfo, entry1, &repl); |
09d96860 FW |
1227 | if (ret) |
1228 | goto free_newinfo; | |
1229 | ||
d6a2ba07 PM |
1230 | *pinfo = newinfo; |
1231 | *pentry0 = entry1; | |
1232 | xt_free_table_info(info); | |
1233 | return 0; | |
1234 | ||
1235 | free_newinfo: | |
1236 | xt_free_table_info(newinfo); | |
09d96860 FW |
1237 | return ret; |
1238 | out_unlock: | |
1239 | xt_compat_flush_offsets(NFPROTO_ARP); | |
1240 | xt_compat_unlock(NFPROTO_ARP); | |
8dddd327 | 1241 | xt_entry_foreach(iter0, entry0, compatr->size) { |
0559518b | 1242 | if (j-- == 0) |
72b2b1dd | 1243 | break; |
0559518b JE |
1244 | compat_release_entry(iter0); |
1245 | } | |
d6a2ba07 | 1246 | return ret; |
d6a2ba07 PM |
1247 | } |
1248 | ||
c2f12630 | 1249 | static int compat_do_replace(struct net *net, sockptr_t arg, unsigned int len) |
d6a2ba07 PM |
1250 | { |
1251 | int ret; | |
1252 | struct compat_arpt_replace tmp; | |
1253 | struct xt_table_info *newinfo; | |
1254 | void *loc_cpu_entry; | |
72b2b1dd | 1255 | struct arpt_entry *iter; |
d6a2ba07 | 1256 | |
c2f12630 | 1257 | if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0) |
d6a2ba07 PM |
1258 | return -EFAULT; |
1259 | ||
1260 | /* overflow check */ | |
d6a2ba07 PM |
1261 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1262 | return -ENOMEM; | |
1086bbe9 DJ |
1263 | if (tmp.num_counters == 0) |
1264 | return -EINVAL; | |
1265 | ||
42eab94f | 1266 | tmp.name[sizeof(tmp.name)-1] = 0; |
d6a2ba07 PM |
1267 | |
1268 | newinfo = xt_alloc_table_info(tmp.size); | |
1269 | if (!newinfo) | |
1270 | return -ENOMEM; | |
1271 | ||
482cfc31 | 1272 | loc_cpu_entry = newinfo->entries; |
d3c48151 CH |
1273 | if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp), |
1274 | tmp.size) != 0) { | |
d6a2ba07 PM |
1275 | ret = -EFAULT; |
1276 | goto free_newinfo; | |
1277 | } | |
1278 | ||
1b789577 | 1279 | ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp); |
d6a2ba07 PM |
1280 | if (ret != 0) |
1281 | goto free_newinfo; | |
1282 | ||
79df341a | 1283 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
d6a2ba07 PM |
1284 | tmp.num_counters, compat_ptr(tmp.counters)); |
1285 | if (ret) | |
1286 | goto free_newinfo_untrans; | |
1287 | return 0; | |
1288 | ||
1289 | free_newinfo_untrans: | |
72b2b1dd | 1290 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
212e7f56 | 1291 | cleanup_entry(iter, net); |
d6a2ba07 PM |
1292 | free_newinfo: |
1293 | xt_free_table_info(newinfo); | |
1294 | return ret; | |
1295 | } | |
1296 | ||
d6a2ba07 PM |
1297 | static int compat_copy_entry_to_user(struct arpt_entry *e, void __user **dstptr, |
1298 | compat_uint_t *size, | |
1299 | struct xt_counters *counters, | |
0559518b | 1300 | unsigned int i) |
d6a2ba07 | 1301 | { |
87a2e70d | 1302 | struct xt_entry_target *t; |
d6a2ba07 PM |
1303 | struct compat_arpt_entry __user *ce; |
1304 | u_int16_t target_offset, next_offset; | |
1305 | compat_uint_t origsize; | |
1306 | int ret; | |
1307 | ||
d6a2ba07 | 1308 | origsize = *size; |
68ad546a | 1309 | ce = *dstptr; |
0559518b JE |
1310 | if (copy_to_user(ce, e, sizeof(struct arpt_entry)) != 0 || |
1311 | copy_to_user(&ce->counters, &counters[i], | |
1312 | sizeof(counters[i])) != 0) | |
1313 | return -EFAULT; | |
d6a2ba07 PM |
1314 | |
1315 | *dstptr += sizeof(struct compat_arpt_entry); | |
1316 | *size -= sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
1317 | ||
1318 | target_offset = e->target_offset - (origsize - *size); | |
1319 | ||
1320 | t = arpt_get_target(e); | |
1321 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1322 | if (ret) | |
0559518b | 1323 | return ret; |
d6a2ba07 | 1324 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1325 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1326 | put_user(next_offset, &ce->next_offset) != 0) | |
1327 | return -EFAULT; | |
d6a2ba07 | 1328 | return 0; |
d6a2ba07 PM |
1329 | } |
1330 | ||
1331 | static int compat_copy_entries_to_user(unsigned int total_size, | |
4abff077 | 1332 | struct xt_table *table, |
d6a2ba07 PM |
1333 | void __user *userptr) |
1334 | { | |
1335 | struct xt_counters *counters; | |
d3d40f23 | 1336 | const struct xt_table_info *private = table->private; |
d6a2ba07 PM |
1337 | void __user *pos; |
1338 | unsigned int size; | |
1339 | int ret = 0; | |
d6a2ba07 | 1340 | unsigned int i = 0; |
72b2b1dd | 1341 | struct arpt_entry *iter; |
d6a2ba07 PM |
1342 | |
1343 | counters = alloc_counters(table); | |
1344 | if (IS_ERR(counters)) | |
1345 | return PTR_ERR(counters); | |
1346 | ||
d6a2ba07 PM |
1347 | pos = userptr; |
1348 | size = total_size; | |
482cfc31 | 1349 | xt_entry_foreach(iter, private->entries, total_size) { |
72b2b1dd | 1350 | ret = compat_copy_entry_to_user(iter, &pos, |
6b4ff2d7 | 1351 | &size, counters, i++); |
72b2b1dd JE |
1352 | if (ret != 0) |
1353 | break; | |
1354 | } | |
d6a2ba07 PM |
1355 | vfree(counters); |
1356 | return ret; | |
1357 | } | |
1358 | ||
1359 | struct compat_arpt_get_entries { | |
12b00c2c | 1360 | char name[XT_TABLE_MAXNAMELEN]; |
d6a2ba07 | 1361 | compat_uint_t size; |
6daf1414 | 1362 | struct compat_arpt_entry entrytable[]; |
d6a2ba07 PM |
1363 | }; |
1364 | ||
79df341a AD |
1365 | static int compat_get_entries(struct net *net, |
1366 | struct compat_arpt_get_entries __user *uptr, | |
d6a2ba07 PM |
1367 | int *len) |
1368 | { | |
1369 | int ret; | |
1370 | struct compat_arpt_get_entries get; | |
4abff077 | 1371 | struct xt_table *t; |
d6a2ba07 | 1372 | |
d7cdf816 | 1373 | if (*len < sizeof(get)) |
d6a2ba07 | 1374 | return -EINVAL; |
d6a2ba07 PM |
1375 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1376 | return -EFAULT; | |
d7cdf816 | 1377 | if (*len != sizeof(struct compat_arpt_get_entries) + get.size) |
d6a2ba07 | 1378 | return -EINVAL; |
d7cdf816 | 1379 | |
b301f253 | 1380 | get.name[sizeof(get.name) - 1] = '\0'; |
d6a2ba07 | 1381 | |
ee999d8b JE |
1382 | xt_compat_lock(NFPROTO_ARP); |
1383 | t = xt_find_table_lock(net, NFPROTO_ARP, get.name); | |
03d13b68 | 1384 | if (!IS_ERR(t)) { |
abe7034b | 1385 | const struct xt_table_info *private = t->private; |
d6a2ba07 PM |
1386 | struct xt_table_info info; |
1387 | ||
d6a2ba07 PM |
1388 | ret = compat_table_info(private, &info); |
1389 | if (!ret && get.size == info.size) { | |
1390 | ret = compat_copy_entries_to_user(private->size, | |
1391 | t, uptr->entrytable); | |
d7cdf816 | 1392 | } else if (!ret) |
544473c1 | 1393 | ret = -EAGAIN; |
d7cdf816 | 1394 | |
ee999d8b | 1395 | xt_compat_flush_offsets(NFPROTO_ARP); |
d6a2ba07 PM |
1396 | module_put(t->me); |
1397 | xt_table_unlock(t); | |
1398 | } else | |
03d13b68 | 1399 | ret = PTR_ERR(t); |
d6a2ba07 | 1400 | |
ee999d8b | 1401 | xt_compat_unlock(NFPROTO_ARP); |
d6a2ba07 PM |
1402 | return ret; |
1403 | } | |
d6a2ba07 PM |
1404 | #endif |
1405 | ||
c2f12630 CH |
1406 | static int do_arpt_set_ctl(struct sock *sk, int cmd, sockptr_t arg, |
1407 | unsigned int len) | |
1da177e4 LT |
1408 | { |
1409 | int ret; | |
1410 | ||
52e804c6 | 1411 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1412 | return -EPERM; |
1413 | ||
1414 | switch (cmd) { | |
1415 | case ARPT_SO_SET_REPLACE: | |
47a6959f | 1416 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
983094b4 | 1417 | if (in_compat_syscall()) |
c2f12630 | 1418 | ret = compat_do_replace(sock_net(sk), arg, len); |
983094b4 CH |
1419 | else |
1420 | #endif | |
c2f12630 | 1421 | ret = do_replace(sock_net(sk), arg, len); |
1da177e4 LT |
1422 | break; |
1423 | ||
1424 | case ARPT_SO_SET_ADD_COUNTERS: | |
c2f12630 | 1425 | ret = do_add_counters(sock_net(sk), arg, len); |
1da177e4 LT |
1426 | break; |
1427 | ||
1428 | default: | |
1da177e4 LT |
1429 | ret = -EINVAL; |
1430 | } | |
1431 | ||
1432 | return ret; | |
1433 | } | |
1434 | ||
1435 | static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1436 | { | |
1437 | int ret; | |
1438 | ||
52e804c6 | 1439 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1440 | return -EPERM; |
1441 | ||
1442 | switch (cmd) { | |
41acd975 | 1443 | case ARPT_SO_GET_INFO: |
983094b4 | 1444 | ret = get_info(sock_net(sk), user, len); |
41acd975 | 1445 | break; |
1da177e4 | 1446 | |
11f6dff8 | 1447 | case ARPT_SO_GET_ENTRIES: |
47a6959f | 1448 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
983094b4 CH |
1449 | if (in_compat_syscall()) |
1450 | ret = compat_get_entries(sock_net(sk), user, len); | |
1451 | else | |
1452 | #endif | |
1453 | ret = get_entries(sock_net(sk), user, len); | |
1da177e4 | 1454 | break; |
1da177e4 | 1455 | |
6b7d31fc | 1456 | case ARPT_SO_GET_REVISION_TARGET: { |
2e4e6a17 | 1457 | struct xt_get_revision rev; |
6b7d31fc HW |
1458 | |
1459 | if (*len != sizeof(rev)) { | |
1460 | ret = -EINVAL; | |
1461 | break; | |
1462 | } | |
1463 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1464 | ret = -EFAULT; | |
1465 | break; | |
1466 | } | |
42eab94f | 1467 | rev.name[sizeof(rev.name)-1] = 0; |
6b7d31fc | 1468 | |
ee999d8b | 1469 | try_then_request_module(xt_find_revision(NFPROTO_ARP, rev.name, |
2e4e6a17 | 1470 | rev.revision, 1, &ret), |
6b7d31fc HW |
1471 | "arpt_%s", rev.name); |
1472 | break; | |
1473 | } | |
1474 | ||
1da177e4 | 1475 | default: |
1da177e4 LT |
1476 | ret = -EINVAL; |
1477 | } | |
1478 | ||
1479 | return ret; | |
1480 | } | |
1481 | ||
212e7f56 | 1482 | static void __arpt_unregister_table(struct net *net, struct xt_table *table) |
b9e69e12 FW |
1483 | { |
1484 | struct xt_table_info *private; | |
1485 | void *loc_cpu_entry; | |
1486 | struct module *table_owner = table->me; | |
1487 | struct arpt_entry *iter; | |
1488 | ||
1489 | private = xt_unregister_table(table); | |
1490 | ||
1491 | /* Decrease module usage counts and free resources */ | |
1492 | loc_cpu_entry = private->entries; | |
1493 | xt_entry_foreach(iter, loc_cpu_entry, private->size) | |
212e7f56 | 1494 | cleanup_entry(iter, net); |
b9e69e12 FW |
1495 | if (private->number > private->initial_entries) |
1496 | module_put(table_owner); | |
1497 | xt_free_table_info(private); | |
1498 | } | |
1499 | ||
a67dd266 FW |
1500 | int arpt_register_table(struct net *net, |
1501 | const struct xt_table *table, | |
1502 | const struct arpt_replace *repl, | |
f9006acc | 1503 | const struct nf_hook_ops *template_ops) |
1da177e4 | 1504 | { |
f9006acc FW |
1505 | struct nf_hook_ops *ops; |
1506 | unsigned int num_ops; | |
1507 | int ret, i; | |
2e4e6a17 | 1508 | struct xt_table_info *newinfo; |
f3c5c1bf | 1509 | struct xt_table_info bootstrap = {0}; |
31836064 | 1510 | void *loc_cpu_entry; |
a98da11d | 1511 | struct xt_table *new_table; |
1da177e4 | 1512 | |
2e4e6a17 | 1513 | newinfo = xt_alloc_table_info(repl->size); |
a67dd266 FW |
1514 | if (!newinfo) |
1515 | return -ENOMEM; | |
31836064 | 1516 | |
482cfc31 | 1517 | loc_cpu_entry = newinfo->entries; |
31836064 | 1518 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
1da177e4 | 1519 | |
1b789577 | 1520 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
f9006acc FW |
1521 | if (ret != 0) { |
1522 | xt_free_table_info(newinfo); | |
1523 | return ret; | |
1524 | } | |
1da177e4 | 1525 | |
79df341a | 1526 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 1527 | if (IS_ERR(new_table)) { |
f9006acc FW |
1528 | xt_free_table_info(newinfo); |
1529 | return PTR_ERR(new_table); | |
1da177e4 | 1530 | } |
a67dd266 | 1531 | |
f9006acc FW |
1532 | num_ops = hweight32(table->valid_hooks); |
1533 | if (num_ops == 0) { | |
1534 | ret = -EINVAL; | |
1535 | goto out_free; | |
1536 | } | |
a67dd266 | 1537 | |
f9006acc FW |
1538 | ops = kmemdup(template_ops, sizeof(*ops) * num_ops, GFP_KERNEL); |
1539 | if (!ops) { | |
1540 | ret = -ENOMEM; | |
1541 | goto out_free; | |
b9e69e12 FW |
1542 | } |
1543 | ||
f9006acc FW |
1544 | for (i = 0; i < num_ops; i++) |
1545 | ops[i].priv = new_table; | |
1546 | ||
1547 | new_table->ops = ops; | |
1548 | ||
1549 | ret = nf_register_net_hooks(net, ops, num_ops); | |
1550 | if (ret != 0) | |
1551 | goto out_free; | |
1552 | ||
a67dd266 | 1553 | return ret; |
1da177e4 | 1554 | |
44d34e72 | 1555 | out_free: |
f9006acc | 1556 | __arpt_unregister_table(net, new_table); |
a67dd266 | 1557 | return ret; |
1da177e4 LT |
1558 | } |
1559 | ||
43016d02 | 1560 | void arpt_unregister_table_pre_exit(struct net *net, const char *name) |
1da177e4 | 1561 | { |
4d705399 FW |
1562 | struct xt_table *table = xt_find_table(net, NFPROTO_ARP, name); |
1563 | ||
1564 | if (table) | |
43016d02 | 1565 | nf_unregister_net_hooks(net, table->ops, hweight32(table->valid_hooks)); |
d163a925 FW |
1566 | } |
1567 | EXPORT_SYMBOL(arpt_unregister_table_pre_exit); | |
1568 | ||
4d705399 | 1569 | void arpt_unregister_table(struct net *net, const char *name) |
d163a925 | 1570 | { |
4d705399 FW |
1571 | struct xt_table *table = xt_find_table(net, NFPROTO_ARP, name); |
1572 | ||
1573 | if (table) | |
1574 | __arpt_unregister_table(net, table); | |
1da177e4 LT |
1575 | } |
1576 | ||
1577 | /* The built-in targets: standard (NULL) and error. */ | |
4538506b JE |
1578 | static struct xt_target arpt_builtin_tg[] __read_mostly = { |
1579 | { | |
243bf6e2 | 1580 | .name = XT_STANDARD_TARGET, |
4538506b JE |
1581 | .targetsize = sizeof(int), |
1582 | .family = NFPROTO_ARP, | |
47a6959f | 1583 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
4538506b JE |
1584 | .compatsize = sizeof(compat_int_t), |
1585 | .compat_from_user = compat_standard_from_user, | |
1586 | .compat_to_user = compat_standard_to_user, | |
d6a2ba07 | 1587 | #endif |
4538506b JE |
1588 | }, |
1589 | { | |
243bf6e2 | 1590 | .name = XT_ERROR_TARGET, |
4538506b | 1591 | .target = arpt_error, |
12b00c2c | 1592 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
1593 | .family = NFPROTO_ARP, |
1594 | }, | |
1da177e4 LT |
1595 | }; |
1596 | ||
1597 | static struct nf_sockopt_ops arpt_sockopts = { | |
1598 | .pf = PF_INET, | |
1599 | .set_optmin = ARPT_BASE_CTL, | |
1600 | .set_optmax = ARPT_SO_SET_MAX+1, | |
1601 | .set = do_arpt_set_ctl, | |
1602 | .get_optmin = ARPT_BASE_CTL, | |
1603 | .get_optmax = ARPT_SO_GET_MAX+1, | |
1604 | .get = do_arpt_get_ctl, | |
16fcec35 | 1605 | .owner = THIS_MODULE, |
1da177e4 LT |
1606 | }; |
1607 | ||
3cb609d5 AD |
1608 | static int __net_init arp_tables_net_init(struct net *net) |
1609 | { | |
ee999d8b | 1610 | return xt_proto_init(net, NFPROTO_ARP); |
3cb609d5 AD |
1611 | } |
1612 | ||
1613 | static void __net_exit arp_tables_net_exit(struct net *net) | |
1614 | { | |
ee999d8b | 1615 | xt_proto_fini(net, NFPROTO_ARP); |
3cb609d5 AD |
1616 | } |
1617 | ||
1618 | static struct pernet_operations arp_tables_net_ops = { | |
1619 | .init = arp_tables_net_init, | |
1620 | .exit = arp_tables_net_exit, | |
1621 | }; | |
1622 | ||
65b4b4e8 | 1623 | static int __init arp_tables_init(void) |
1da177e4 LT |
1624 | { |
1625 | int ret; | |
1626 | ||
3cb609d5 | 1627 | ret = register_pernet_subsys(&arp_tables_net_ops); |
0eff66e6 PM |
1628 | if (ret < 0) |
1629 | goto err1; | |
2e4e6a17 | 1630 | |
25985edc | 1631 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 1632 | ret = xt_register_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg)); |
0eff66e6 PM |
1633 | if (ret < 0) |
1634 | goto err2; | |
1da177e4 LT |
1635 | |
1636 | /* Register setsockopt */ | |
1637 | ret = nf_register_sockopt(&arpt_sockopts); | |
0eff66e6 PM |
1638 | if (ret < 0) |
1639 | goto err4; | |
1da177e4 | 1640 | |
1da177e4 | 1641 | return 0; |
0eff66e6 PM |
1642 | |
1643 | err4: | |
4538506b | 1644 | xt_unregister_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg)); |
0eff66e6 | 1645 | err2: |
3cb609d5 | 1646 | unregister_pernet_subsys(&arp_tables_net_ops); |
0eff66e6 PM |
1647 | err1: |
1648 | return ret; | |
1da177e4 LT |
1649 | } |
1650 | ||
65b4b4e8 | 1651 | static void __exit arp_tables_fini(void) |
1da177e4 LT |
1652 | { |
1653 | nf_unregister_sockopt(&arpt_sockopts); | |
4538506b | 1654 | xt_unregister_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg)); |
3cb609d5 | 1655 | unregister_pernet_subsys(&arp_tables_net_ops); |
1da177e4 LT |
1656 | } |
1657 | ||
1658 | EXPORT_SYMBOL(arpt_register_table); | |
1659 | EXPORT_SYMBOL(arpt_unregister_table); | |
1660 | EXPORT_SYMBOL(arpt_do_table); | |
1da177e4 | 1661 | |
65b4b4e8 AM |
1662 | module_init(arp_tables_init); |
1663 | module_exit(arp_tables_fini); |