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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Packet matching code for ARP packets. | |
3 | * | |
4 | * Based heavily, if not almost entirely, upon ip_tables.c framework. | |
5 | * | |
6 | * Some ARP specific bits are: | |
7 | * | |
8 | * Copyright (C) 2002 David S. Miller (davem@redhat.com) | |
f229f6ce | 9 | * Copyright (C) 2006-2009 Patrick McHardy <kaber@trash.net> |
1da177e4 LT |
10 | * |
11 | */ | |
90e7d4ab | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
1da177e4 LT |
13 | #include <linux/kernel.h> |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
4fc268d2 | 16 | #include <linux/capability.h> |
1da177e4 LT |
17 | #include <linux/if_arp.h> |
18 | #include <linux/kmod.h> | |
19 | #include <linux/vmalloc.h> | |
20 | #include <linux/proc_fs.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/init.h> | |
57b47a53 | 23 | #include <linux/mutex.h> |
d6a2ba07 PM |
24 | #include <linux/err.h> |
25 | #include <net/compat.h> | |
79df341a | 26 | #include <net/sock.h> |
7c0f6ba6 | 27 | #include <linux/uaccess.h> |
1da177e4 | 28 | |
2e4e6a17 | 29 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 30 | #include <linux/netfilter_arp/arp_tables.h> |
e3eaa991 | 31 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
32 | |
33 | MODULE_LICENSE("GPL"); | |
34 | MODULE_AUTHOR("David S. Miller <davem@redhat.com>"); | |
35 | MODULE_DESCRIPTION("arptables core"); | |
36 | ||
e3eaa991 JE |
37 | void *arpt_alloc_initial_table(const struct xt_table *info) |
38 | { | |
39 | return xt_alloc_initial_table(arpt, ARPT); | |
40 | } | |
41 | EXPORT_SYMBOL_GPL(arpt_alloc_initial_table); | |
42 | ||
1da177e4 | 43 | static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap, |
5452e425 | 44 | const char *hdr_addr, int len) |
1da177e4 LT |
45 | { |
46 | int i, ret; | |
47 | ||
48 | if (len > ARPT_DEV_ADDR_LEN_MAX) | |
49 | len = ARPT_DEV_ADDR_LEN_MAX; | |
50 | ||
51 | ret = 0; | |
52 | for (i = 0; i < len; i++) | |
53 | ret |= (hdr_addr[i] ^ ap->addr[i]) & ap->mask[i]; | |
54 | ||
a02cec21 | 55 | return ret != 0; |
1da177e4 LT |
56 | } |
57 | ||
ddc214c4 | 58 | /* |
25985edc | 59 | * Unfortunately, _b and _mask are not aligned to an int (or long int) |
ddc214c4 | 60 | * Some arches dont care, unrolling the loop is a win on them. |
35c7f6de | 61 | * For other arches, we only have a 16bit alignement. |
ddc214c4 ED |
62 | */ |
63 | static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask) | |
64 | { | |
65 | #ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS | |
b8dfe498 | 66 | unsigned long ret = ifname_compare_aligned(_a, _b, _mask); |
ddc214c4 ED |
67 | #else |
68 | unsigned long ret = 0; | |
35c7f6de ED |
69 | const u16 *a = (const u16 *)_a; |
70 | const u16 *b = (const u16 *)_b; | |
71 | const u16 *mask = (const u16 *)_mask; | |
ddc214c4 ED |
72 | int i; |
73 | ||
35c7f6de ED |
74 | for (i = 0; i < IFNAMSIZ/sizeof(u16); i++) |
75 | ret |= (a[i] ^ b[i]) & mask[i]; | |
ddc214c4 ED |
76 | #endif |
77 | return ret; | |
78 | } | |
79 | ||
1da177e4 LT |
80 | /* Returns whether packet matches rule or not. */ |
81 | static inline int arp_packet_match(const struct arphdr *arphdr, | |
82 | struct net_device *dev, | |
83 | const char *indev, | |
84 | const char *outdev, | |
85 | const struct arpt_arp *arpinfo) | |
86 | { | |
5452e425 JE |
87 | const char *arpptr = (char *)(arphdr + 1); |
88 | const char *src_devaddr, *tgt_devaddr; | |
59b8bfd8 | 89 | __be32 src_ipaddr, tgt_ipaddr; |
ddc214c4 | 90 | long ret; |
1da177e4 | 91 | |
c37a2dfa JP |
92 | if (NF_INVF(arpinfo, ARPT_INV_ARPOP, |
93 | (arphdr->ar_op & arpinfo->arpop_mask) != arpinfo->arpop)) | |
1da177e4 | 94 | return 0; |
1da177e4 | 95 | |
c37a2dfa JP |
96 | if (NF_INVF(arpinfo, ARPT_INV_ARPHRD, |
97 | (arphdr->ar_hrd & arpinfo->arhrd_mask) != arpinfo->arhrd)) | |
1da177e4 | 98 | return 0; |
1da177e4 | 99 | |
c37a2dfa JP |
100 | if (NF_INVF(arpinfo, ARPT_INV_ARPPRO, |
101 | (arphdr->ar_pro & arpinfo->arpro_mask) != arpinfo->arpro)) | |
1da177e4 | 102 | return 0; |
1da177e4 | 103 | |
c37a2dfa JP |
104 | if (NF_INVF(arpinfo, ARPT_INV_ARPHLN, |
105 | (arphdr->ar_hln & arpinfo->arhln_mask) != arpinfo->arhln)) | |
1da177e4 | 106 | return 0; |
1da177e4 LT |
107 | |
108 | src_devaddr = arpptr; | |
109 | arpptr += dev->addr_len; | |
110 | memcpy(&src_ipaddr, arpptr, sizeof(u32)); | |
111 | arpptr += sizeof(u32); | |
112 | tgt_devaddr = arpptr; | |
113 | arpptr += dev->addr_len; | |
114 | memcpy(&tgt_ipaddr, arpptr, sizeof(u32)); | |
115 | ||
c37a2dfa JP |
116 | if (NF_INVF(arpinfo, ARPT_INV_SRCDEVADDR, |
117 | arp_devaddr_compare(&arpinfo->src_devaddr, src_devaddr, | |
118 | dev->addr_len)) || | |
119 | NF_INVF(arpinfo, ARPT_INV_TGTDEVADDR, | |
120 | arp_devaddr_compare(&arpinfo->tgt_devaddr, tgt_devaddr, | |
121 | dev->addr_len))) | |
1da177e4 | 122 | return 0; |
1da177e4 | 123 | |
c37a2dfa JP |
124 | if (NF_INVF(arpinfo, ARPT_INV_SRCIP, |
125 | (src_ipaddr & arpinfo->smsk.s_addr) != arpinfo->src.s_addr) || | |
126 | NF_INVF(arpinfo, ARPT_INV_TGTIP, | |
127 | (tgt_ipaddr & arpinfo->tmsk.s_addr) != arpinfo->tgt.s_addr)) | |
1da177e4 | 128 | return 0; |
1da177e4 LT |
129 | |
130 | /* Look for ifname matches. */ | |
ddc214c4 | 131 | ret = ifname_compare(indev, arpinfo->iniface, arpinfo->iniface_mask); |
1da177e4 | 132 | |
c37a2dfa | 133 | if (NF_INVF(arpinfo, ARPT_INV_VIA_IN, ret != 0)) |
1da177e4 | 134 | return 0; |
1da177e4 | 135 | |
ddc214c4 | 136 | ret = ifname_compare(outdev, arpinfo->outiface, arpinfo->outiface_mask); |
1da177e4 | 137 | |
c37a2dfa | 138 | if (NF_INVF(arpinfo, ARPT_INV_VIA_OUT, ret != 0)) |
1da177e4 | 139 | return 0; |
1da177e4 LT |
140 | |
141 | return 1; | |
142 | } | |
143 | ||
144 | static inline int arp_checkentry(const struct arpt_arp *arp) | |
145 | { | |
d7cdf816 | 146 | if (arp->flags & ~ARPT_F_MASK) |
1da177e4 | 147 | return 0; |
d7cdf816 | 148 | if (arp->invflags & ~ARPT_INV_MASK) |
1da177e4 | 149 | return 0; |
1da177e4 LT |
150 | |
151 | return 1; | |
152 | } | |
153 | ||
7eb35586 | 154 | static unsigned int |
4b560b44 | 155 | arpt_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 156 | { |
e87cc472 JP |
157 | net_err_ratelimited("arp_tables: error: '%s'\n", |
158 | (const char *)par->targinfo); | |
1da177e4 LT |
159 | |
160 | return NF_DROP; | |
161 | } | |
162 | ||
87a2e70d | 163 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
164 | arpt_get_target_c(const struct arpt_entry *e) |
165 | { | |
166 | return arpt_get_target((struct arpt_entry *)e); | |
167 | } | |
168 | ||
169 | static inline struct arpt_entry * | |
170 | get_entry(const void *base, unsigned int offset) | |
1da177e4 LT |
171 | { |
172 | return (struct arpt_entry *)(base + offset); | |
173 | } | |
174 | ||
6c7941de | 175 | static inline |
98e86403 JE |
176 | struct arpt_entry *arpt_next_entry(const struct arpt_entry *entry) |
177 | { | |
178 | return (void *)entry + entry->next_offset; | |
179 | } | |
180 | ||
3db05fea | 181 | unsigned int arpt_do_table(struct sk_buff *skb, |
b85c3dc9 | 182 | const struct nf_hook_state *state, |
4abff077 | 183 | struct xt_table *table) |
1da177e4 | 184 | { |
6cb8ff3f | 185 | unsigned int hook = state->hook; |
ddc214c4 | 186 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 | 187 | unsigned int verdict = NF_DROP; |
5452e425 | 188 | const struct arphdr *arp; |
3bd22997 | 189 | struct arpt_entry *e, **jumpstack; |
1da177e4 | 190 | const char *indev, *outdev; |
711bdde6 | 191 | const void *table_base; |
3bd22997 | 192 | unsigned int cpu, stackidx = 0; |
5452e425 | 193 | const struct xt_table_info *private; |
de74c169 | 194 | struct xt_action_param acpar; |
7f5c6d4f | 195 | unsigned int addend; |
1da177e4 | 196 | |
988b7050 | 197 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
1da177e4 LT |
198 | return NF_DROP; |
199 | ||
b85c3dc9 DM |
200 | indev = state->in ? state->in->name : nulldevname; |
201 | outdev = state->out ? state->out->name : nulldevname; | |
1da177e4 | 202 | |
7f5c6d4f ED |
203 | local_bh_disable(); |
204 | addend = xt_write_recseq_begin(); | |
942e4a2b | 205 | private = table->private; |
3bd22997 | 206 | cpu = smp_processor_id(); |
b416c144 WD |
207 | /* |
208 | * Ensure we load private-> members after we've fetched the base | |
209 | * pointer. | |
210 | */ | |
211 | smp_read_barrier_depends(); | |
482cfc31 | 212 | table_base = private->entries; |
3bd22997 | 213 | jumpstack = (struct arpt_entry **)private->jumpstack[cpu]; |
78454473 | 214 | |
7814b6ec FW |
215 | /* No TEE support for arptables, so no need to switch to alternate |
216 | * stack. All targets that reenter must return absolute verdicts. | |
217 | */ | |
2e4e6a17 | 218 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 219 | |
613dbd95 | 220 | acpar.state = state; |
b4ba2611 | 221 | acpar.hotdrop = false; |
7eb35586 | 222 | |
3db05fea | 223 | arp = arp_hdr(skb); |
1da177e4 | 224 | do { |
87a2e70d | 225 | const struct xt_entry_target *t; |
71ae0dff | 226 | struct xt_counters *counter; |
a1ff4ac8 JE |
227 | |
228 | if (!arp_packet_match(arp, skb->dev, indev, outdev, &e->arp)) { | |
229 | e = arpt_next_entry(e); | |
230 | continue; | |
231 | } | |
232 | ||
71ae0dff FW |
233 | counter = xt_get_this_cpu_counter(&e->counters); |
234 | ADD_COUNTER(*counter, arp_hdr_len(skb->dev), 1); | |
1da177e4 | 235 | |
d5d1baa1 | 236 | t = arpt_get_target_c(e); |
a1ff4ac8 JE |
237 | |
238 | /* Standard target? */ | |
239 | if (!t->u.kernel.target->target) { | |
240 | int v; | |
241 | ||
87a2e70d | 242 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
243 | if (v < 0) { |
244 | /* Pop from stack? */ | |
243bf6e2 | 245 | if (v != XT_RETURN) { |
95c96174 | 246 | verdict = (unsigned int)(-v) - 1; |
1da177e4 | 247 | break; |
a1ff4ac8 | 248 | } |
3bd22997 FW |
249 | if (stackidx == 0) { |
250 | e = get_entry(table_base, | |
251 | private->underflow[hook]); | |
252 | } else { | |
253 | e = jumpstack[--stackidx]; | |
254 | e = arpt_next_entry(e); | |
255 | } | |
a1ff4ac8 | 256 | continue; |
1da177e4 | 257 | } |
a1ff4ac8 JE |
258 | if (table_base + v |
259 | != arpt_next_entry(e)) { | |
3bd22997 | 260 | jumpstack[stackidx++] = e; |
a1ff4ac8 JE |
261 | } |
262 | ||
263 | e = get_entry(table_base, v); | |
7a6b1c46 | 264 | continue; |
1da177e4 | 265 | } |
7a6b1c46 | 266 | |
de74c169 JE |
267 | acpar.target = t->u.kernel.target; |
268 | acpar.targinfo = t->data; | |
269 | verdict = t->u.kernel.target->target(skb, &acpar); | |
7a6b1c46 | 270 | |
9beceb54 TY |
271 | if (verdict == XT_CONTINUE) { |
272 | /* Target might have changed stuff. */ | |
273 | arp = arp_hdr(skb); | |
7a6b1c46 | 274 | e = arpt_next_entry(e); |
9beceb54 | 275 | } else { |
7a6b1c46 JE |
276 | /* Verdict */ |
277 | break; | |
9beceb54 | 278 | } |
b4ba2611 | 279 | } while (!acpar.hotdrop); |
7f5c6d4f ED |
280 | xt_write_recseq_end(addend); |
281 | local_bh_enable(); | |
1da177e4 | 282 | |
b4ba2611 | 283 | if (acpar.hotdrop) |
1da177e4 LT |
284 | return NF_DROP; |
285 | else | |
286 | return verdict; | |
287 | } | |
288 | ||
1da177e4 | 289 | /* All zeroes == unconditional rule. */ |
54d83fc7 | 290 | static inline bool unconditional(const struct arpt_entry *e) |
1da177e4 | 291 | { |
47901dc2 | 292 | static const struct arpt_arp uncond; |
1da177e4 | 293 | |
54d83fc7 FW |
294 | return e->target_offset == sizeof(struct arpt_entry) && |
295 | memcmp(&e->arp, &uncond, sizeof(uncond)) == 0; | |
1da177e4 LT |
296 | } |
297 | ||
298 | /* Figures out from what hook each rule can be called: returns 0 if | |
299 | * there are loops. Puts hook bitmask in comefrom. | |
300 | */ | |
98dbbfc3 | 301 | static int mark_source_chains(const struct xt_table_info *newinfo, |
f4dc7771 FW |
302 | unsigned int valid_hooks, void *entry0, |
303 | unsigned int *offsets) | |
1da177e4 LT |
304 | { |
305 | unsigned int hook; | |
306 | ||
307 | /* No recursion; use packet counter to save back ptrs (reset | |
308 | * to 0 as we leave), and comefrom to save source hook bitmask. | |
309 | */ | |
310 | for (hook = 0; hook < NF_ARP_NUMHOOKS; hook++) { | |
311 | unsigned int pos = newinfo->hook_entry[hook]; | |
68ad546a | 312 | struct arpt_entry *e = entry0 + pos; |
1da177e4 LT |
313 | |
314 | if (!(valid_hooks & (1 << hook))) | |
315 | continue; | |
316 | ||
317 | /* Set initial back pointer. */ | |
318 | e->counters.pcnt = pos; | |
319 | ||
320 | for (;;) { | |
87a2e70d | 321 | const struct xt_standard_target *t |
d5d1baa1 | 322 | = (void *)arpt_get_target_c(e); |
e1b4b9f3 | 323 | int visited = e->comefrom & (1 << hook); |
1da177e4 | 324 | |
d7cdf816 | 325 | if (e->comefrom & (1 << NF_ARP_NUMHOOKS)) |
1da177e4 | 326 | return 0; |
d7cdf816 | 327 | |
1da177e4 LT |
328 | e->comefrom |
329 | |= ((1 << hook) | (1 << NF_ARP_NUMHOOKS)); | |
330 | ||
331 | /* Unconditional return/END. */ | |
54d83fc7 | 332 | if ((unconditional(e) && |
3666ed1c | 333 | (strcmp(t->target.u.user.name, |
243bf6e2 | 334 | XT_STANDARD_TARGET) == 0) && |
54d83fc7 | 335 | t->verdict < 0) || visited) { |
1da177e4 LT |
336 | unsigned int oldpos, size; |
337 | ||
1f9352ae | 338 | if ((strcmp(t->target.u.user.name, |
243bf6e2 | 339 | XT_STANDARD_TARGET) == 0) && |
d7cdf816 | 340 | t->verdict < -NF_MAX_VERDICT - 1) |
74c9c0c1 | 341 | return 0; |
74c9c0c1 | 342 | |
1da177e4 LT |
343 | /* Return: backtrack through the last |
344 | * big jump. | |
345 | */ | |
346 | do { | |
347 | e->comefrom ^= (1<<NF_ARP_NUMHOOKS); | |
348 | oldpos = pos; | |
349 | pos = e->counters.pcnt; | |
350 | e->counters.pcnt = 0; | |
351 | ||
352 | /* We're at the start. */ | |
353 | if (pos == oldpos) | |
354 | goto next; | |
355 | ||
68ad546a | 356 | e = entry0 + pos; |
1da177e4 LT |
357 | } while (oldpos == pos + e->next_offset); |
358 | ||
359 | /* Move along one */ | |
360 | size = e->next_offset; | |
68ad546a | 361 | e = entry0 + pos + size; |
f24e230d FW |
362 | if (pos + size >= newinfo->size) |
363 | return 0; | |
1da177e4 LT |
364 | e->counters.pcnt = pos; |
365 | pos += size; | |
366 | } else { | |
367 | int newpos = t->verdict; | |
368 | ||
369 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 370 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 371 | newpos >= 0) { |
1da177e4 | 372 | /* This a jump; chase it. */ |
f4dc7771 FW |
373 | if (!xt_find_jump_offset(offsets, newpos, |
374 | newinfo->number)) | |
375 | return 0; | |
1da177e4 LT |
376 | } else { |
377 | /* ... this is a fallthru */ | |
378 | newpos = pos + e->next_offset; | |
f24e230d FW |
379 | if (newpos >= newinfo->size) |
380 | return 0; | |
1da177e4 | 381 | } |
68ad546a | 382 | e = entry0 + newpos; |
1da177e4 LT |
383 | e->counters.pcnt = pos; |
384 | pos = newpos; | |
385 | } | |
386 | } | |
d7cdf816 | 387 | next: ; |
1da177e4 LT |
388 | } |
389 | return 1; | |
390 | } | |
391 | ||
fb5b6095 PM |
392 | static inline int check_target(struct arpt_entry *e, const char *name) |
393 | { | |
87a2e70d | 394 | struct xt_entry_target *t = arpt_get_target(e); |
af5d6dc2 JE |
395 | struct xt_tgchk_param par = { |
396 | .table = name, | |
397 | .entryinfo = e, | |
398 | .target = t->u.kernel.target, | |
399 | .targinfo = t->data, | |
400 | .hook_mask = e->comefrom, | |
916a917d | 401 | .family = NFPROTO_ARP, |
af5d6dc2 JE |
402 | }; |
403 | ||
d7cdf816 | 404 | return xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false); |
fb5b6095 PM |
405 | } |
406 | ||
407 | static inline int | |
ae0ac0ed FW |
408 | find_check_entry(struct arpt_entry *e, const char *name, unsigned int size, |
409 | struct xt_percpu_counter_alloc_state *alloc_state) | |
fb5b6095 | 410 | { |
87a2e70d | 411 | struct xt_entry_target *t; |
95eea855 | 412 | struct xt_target *target; |
fb5b6095 PM |
413 | int ret; |
414 | ||
ae0ac0ed | 415 | if (!xt_percpu_counter_alloc(alloc_state, &e->counters)) |
71ae0dff FW |
416 | return -ENOMEM; |
417 | ||
fb5b6095 | 418 | t = arpt_get_target(e); |
d2a7b6ba JE |
419 | target = xt_request_find_target(NFPROTO_ARP, t->u.user.name, |
420 | t->u.user.revision); | |
421 | if (IS_ERR(target)) { | |
d2a7b6ba | 422 | ret = PTR_ERR(target); |
1da177e4 LT |
423 | goto out; |
424 | } | |
1da177e4 | 425 | t->u.kernel.target = target; |
1da177e4 | 426 | |
fb5b6095 | 427 | ret = check_target(e, name); |
3cdc7c95 PM |
428 | if (ret) |
429 | goto err; | |
1da177e4 | 430 | return 0; |
3cdc7c95 PM |
431 | err: |
432 | module_put(t->u.kernel.target->me); | |
1da177e4 | 433 | out: |
4d31eef5 | 434 | xt_percpu_counter_free(&e->counters); |
71ae0dff | 435 | |
1da177e4 LT |
436 | return ret; |
437 | } | |
438 | ||
d5d1baa1 | 439 | static bool check_underflow(const struct arpt_entry *e) |
e2fe35c1 | 440 | { |
87a2e70d | 441 | const struct xt_entry_target *t; |
e2fe35c1 JE |
442 | unsigned int verdict; |
443 | ||
54d83fc7 | 444 | if (!unconditional(e)) |
e2fe35c1 | 445 | return false; |
d5d1baa1 | 446 | t = arpt_get_target_c(e); |
e2fe35c1 JE |
447 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
448 | return false; | |
87a2e70d | 449 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
450 | verdict = -verdict - 1; |
451 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
452 | } | |
453 | ||
1da177e4 | 454 | static inline int check_entry_size_and_hooks(struct arpt_entry *e, |
2e4e6a17 | 455 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
456 | const unsigned char *base, |
457 | const unsigned char *limit, | |
1da177e4 LT |
458 | const unsigned int *hook_entries, |
459 | const unsigned int *underflows, | |
0559518b | 460 | unsigned int valid_hooks) |
1da177e4 LT |
461 | { |
462 | unsigned int h; | |
bdf533de | 463 | int err; |
1da177e4 | 464 | |
3666ed1c | 465 | if ((unsigned long)e % __alignof__(struct arpt_entry) != 0 || |
6e94e0cf | 466 | (unsigned char *)e + sizeof(struct arpt_entry) >= limit || |
d7cdf816 | 467 | (unsigned char *)e + e->next_offset > limit) |
1da177e4 | 468 | return -EINVAL; |
1da177e4 LT |
469 | |
470 | if (e->next_offset | |
d7cdf816 | 471 | < sizeof(struct arpt_entry) + sizeof(struct xt_entry_target)) |
1da177e4 | 472 | return -EINVAL; |
1da177e4 | 473 | |
aa412ba2 FW |
474 | if (!arp_checkentry(&e->arp)) |
475 | return -EINVAL; | |
476 | ||
ce683e5f FW |
477 | err = xt_check_entry_offsets(e, e->elems, e->target_offset, |
478 | e->next_offset); | |
bdf533de FW |
479 | if (err) |
480 | return err; | |
481 | ||
1da177e4 LT |
482 | /* Check hooks & underflows */ |
483 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { | |
a7d51738 JE |
484 | if (!(valid_hooks & (1 << h))) |
485 | continue; | |
1da177e4 LT |
486 | if ((unsigned char *)e - base == hook_entries[h]) |
487 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 488 | if ((unsigned char *)e - base == underflows[h]) { |
d7cdf816 | 489 | if (!check_underflow(e)) |
90e7d4ab | 490 | return -EINVAL; |
d7cdf816 | 491 | |
1da177e4 | 492 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 493 | } |
1da177e4 LT |
494 | } |
495 | ||
1da177e4 | 496 | /* Clear counters and comefrom */ |
2e4e6a17 | 497 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 498 | e->comefrom = 0; |
1da177e4 LT |
499 | return 0; |
500 | } | |
501 | ||
0559518b | 502 | static inline void cleanup_entry(struct arpt_entry *e) |
1da177e4 | 503 | { |
a2df1648 | 504 | struct xt_tgdtor_param par; |
87a2e70d | 505 | struct xt_entry_target *t; |
1da177e4 | 506 | |
1da177e4 | 507 | t = arpt_get_target(e); |
a2df1648 JE |
508 | par.target = t->u.kernel.target; |
509 | par.targinfo = t->data; | |
916a917d | 510 | par.family = NFPROTO_ARP; |
a2df1648 JE |
511 | if (par.target->destroy != NULL) |
512 | par.target->destroy(&par); | |
513 | module_put(par.target->me); | |
4d31eef5 | 514 | xt_percpu_counter_free(&e->counters); |
1da177e4 LT |
515 | } |
516 | ||
517 | /* Checks and translates the user-supplied table segment (held in | |
518 | * newinfo). | |
519 | */ | |
0f234214 | 520 | static int translate_table(struct xt_table_info *newinfo, void *entry0, |
6c28255b | 521 | const struct arpt_replace *repl) |
1da177e4 | 522 | { |
ae0ac0ed | 523 | struct xt_percpu_counter_alloc_state alloc_state = { 0 }; |
72b2b1dd | 524 | struct arpt_entry *iter; |
f4dc7771 | 525 | unsigned int *offsets; |
1da177e4 | 526 | unsigned int i; |
72b2b1dd | 527 | int ret = 0; |
1da177e4 | 528 | |
0f234214 JE |
529 | newinfo->size = repl->size; |
530 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
531 | |
532 | /* Init all hooks to impossible value. */ | |
533 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
534 | newinfo->hook_entry[i] = 0xFFFFFFFF; | |
535 | newinfo->underflow[i] = 0xFFFFFFFF; | |
536 | } | |
537 | ||
f4dc7771 FW |
538 | offsets = xt_alloc_entry_offsets(newinfo->number); |
539 | if (!offsets) | |
540 | return -ENOMEM; | |
1da177e4 LT |
541 | i = 0; |
542 | ||
543 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
544 | xt_entry_foreach(iter, entry0, newinfo->size) { |
545 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
546 | entry0 + repl->size, |
547 | repl->hook_entry, | |
548 | repl->underflow, | |
549 | repl->valid_hooks); | |
72b2b1dd | 550 | if (ret != 0) |
f4dc7771 FW |
551 | goto out_free; |
552 | if (i < repl->num_entries) | |
553 | offsets[i] = (void *)iter - entry0; | |
0559518b | 554 | ++i; |
98dbbfc3 FW |
555 | if (strcmp(arpt_get_target(iter)->u.user.name, |
556 | XT_ERROR_TARGET) == 0) | |
557 | ++newinfo->stacksize; | |
72b2b1dd | 558 | } |
1da177e4 | 559 | |
f4dc7771 | 560 | ret = -EINVAL; |
d7cdf816 | 561 | if (i != repl->num_entries) |
f4dc7771 | 562 | goto out_free; |
1da177e4 LT |
563 | |
564 | /* Check hooks all assigned */ | |
565 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
566 | /* Only hooks which are valid */ | |
0f234214 | 567 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 | 568 | continue; |
d7cdf816 | 569 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) |
f4dc7771 | 570 | goto out_free; |
d7cdf816 | 571 | if (newinfo->underflow[i] == 0xFFFFFFFF) |
f4dc7771 | 572 | goto out_free; |
1da177e4 LT |
573 | } |
574 | ||
f4dc7771 FW |
575 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) { |
576 | ret = -ELOOP; | |
577 | goto out_free; | |
578 | } | |
579 | kvfree(offsets); | |
74c9c0c1 | 580 | |
1da177e4 LT |
581 | /* Finally, each sanity check must pass */ |
582 | i = 0; | |
72b2b1dd | 583 | xt_entry_foreach(iter, entry0, newinfo->size) { |
ae0ac0ed FW |
584 | ret = find_check_entry(iter, repl->name, repl->size, |
585 | &alloc_state); | |
72b2b1dd JE |
586 | if (ret != 0) |
587 | break; | |
0559518b | 588 | ++i; |
72b2b1dd | 589 | } |
1da177e4 | 590 | |
74c9c0c1 | 591 | if (ret != 0) { |
0559518b JE |
592 | xt_entry_foreach(iter, entry0, newinfo->size) { |
593 | if (i-- == 0) | |
72b2b1dd | 594 | break; |
0559518b JE |
595 | cleanup_entry(iter); |
596 | } | |
74c9c0c1 | 597 | return ret; |
1da177e4 LT |
598 | } |
599 | ||
f4dc7771 FW |
600 | return ret; |
601 | out_free: | |
602 | kvfree(offsets); | |
1da177e4 LT |
603 | return ret; |
604 | } | |
605 | ||
2e4e6a17 HW |
606 | static void get_counters(const struct xt_table_info *t, |
607 | struct xt_counters counters[]) | |
1da177e4 | 608 | { |
72b2b1dd | 609 | struct arpt_entry *iter; |
1da177e4 LT |
610 | unsigned int cpu; |
611 | unsigned int i; | |
612 | ||
6f912042 | 613 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 614 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 615 | |
1da177e4 | 616 | i = 0; |
482cfc31 | 617 | xt_entry_foreach(iter, t->entries, t->size) { |
71ae0dff | 618 | struct xt_counters *tmp; |
83723d60 ED |
619 | u64 bcnt, pcnt; |
620 | unsigned int start; | |
621 | ||
71ae0dff | 622 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
83723d60 | 623 | do { |
7f5c6d4f | 624 | start = read_seqcount_begin(s); |
71ae0dff FW |
625 | bcnt = tmp->bcnt; |
626 | pcnt = tmp->pcnt; | |
7f5c6d4f | 627 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
628 | |
629 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b | 630 | ++i; |
a5d7a714 | 631 | cond_resched(); |
0559518b | 632 | } |
1da177e4 | 633 | } |
78454473 SH |
634 | } |
635 | ||
d13e7b2e FW |
636 | static void get_old_counters(const struct xt_table_info *t, |
637 | struct xt_counters counters[]) | |
638 | { | |
639 | struct arpt_entry *iter; | |
640 | unsigned int cpu, i; | |
641 | ||
642 | for_each_possible_cpu(cpu) { | |
643 | i = 0; | |
644 | xt_entry_foreach(iter, t->entries, t->size) { | |
645 | struct xt_counters *tmp; | |
646 | ||
647 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); | |
648 | ADD_COUNTER(counters[i], tmp->bcnt, tmp->pcnt); | |
649 | ++i; | |
650 | } | |
651 | cond_resched(); | |
652 | } | |
653 | } | |
654 | ||
d5d1baa1 | 655 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 656 | { |
27e2c26b | 657 | unsigned int countersize; |
2e4e6a17 | 658 | struct xt_counters *counters; |
d5d1baa1 | 659 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
660 | |
661 | /* We need atomic snapshot of counters: rest doesn't change | |
662 | * (other than comefrom, which userspace doesn't care | |
663 | * about). | |
664 | */ | |
2e4e6a17 | 665 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 666 | counters = vzalloc(countersize); |
1da177e4 LT |
667 | |
668 | if (counters == NULL) | |
942e4a2b | 669 | return ERR_PTR(-ENOMEM); |
78454473 | 670 | |
942e4a2b | 671 | get_counters(private, counters); |
1da177e4 | 672 | |
27e2c26b PM |
673 | return counters; |
674 | } | |
675 | ||
676 | static int copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 677 | const struct xt_table *table, |
27e2c26b PM |
678 | void __user *userptr) |
679 | { | |
680 | unsigned int off, num; | |
d5d1baa1 | 681 | const struct arpt_entry *e; |
27e2c26b | 682 | struct xt_counters *counters; |
4abff077 | 683 | struct xt_table_info *private = table->private; |
27e2c26b PM |
684 | int ret = 0; |
685 | void *loc_cpu_entry; | |
686 | ||
687 | counters = alloc_counters(table); | |
688 | if (IS_ERR(counters)) | |
689 | return PTR_ERR(counters); | |
690 | ||
482cfc31 | 691 | loc_cpu_entry = private->entries; |
1da177e4 LT |
692 | |
693 | /* FIXME: use iterator macros --RR */ | |
694 | /* ... then go back and fix counters and names */ | |
695 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
87a2e70d | 696 | const struct xt_entry_target *t; |
1da177e4 | 697 | |
68ad546a | 698 | e = loc_cpu_entry + off; |
244b531b WB |
699 | if (copy_to_user(userptr + off, e, sizeof(*e))) { |
700 | ret = -EFAULT; | |
701 | goto free_counters; | |
702 | } | |
1da177e4 LT |
703 | if (copy_to_user(userptr + off |
704 | + offsetof(struct arpt_entry, counters), | |
705 | &counters[num], | |
706 | sizeof(counters[num])) != 0) { | |
707 | ret = -EFAULT; | |
708 | goto free_counters; | |
709 | } | |
710 | ||
d5d1baa1 | 711 | t = arpt_get_target_c(e); |
244b531b | 712 | if (xt_target_to_user(t, userptr + off + e->target_offset)) { |
1da177e4 LT |
713 | ret = -EFAULT; |
714 | goto free_counters; | |
715 | } | |
716 | } | |
717 | ||
718 | free_counters: | |
719 | vfree(counters); | |
720 | return ret; | |
721 | } | |
722 | ||
d6a2ba07 | 723 | #ifdef CONFIG_COMPAT |
739674fb | 724 | static void compat_standard_from_user(void *dst, const void *src) |
d6a2ba07 PM |
725 | { |
726 | int v = *(compat_int_t *)src; | |
727 | ||
728 | if (v > 0) | |
ee999d8b | 729 | v += xt_compat_calc_jump(NFPROTO_ARP, v); |
d6a2ba07 PM |
730 | memcpy(dst, &v, sizeof(v)); |
731 | } | |
732 | ||
739674fb | 733 | static int compat_standard_to_user(void __user *dst, const void *src) |
d6a2ba07 PM |
734 | { |
735 | compat_int_t cv = *(int *)src; | |
736 | ||
737 | if (cv > 0) | |
ee999d8b | 738 | cv -= xt_compat_calc_jump(NFPROTO_ARP, cv); |
d6a2ba07 PM |
739 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
740 | } | |
741 | ||
d5d1baa1 | 742 | static int compat_calc_entry(const struct arpt_entry *e, |
d6a2ba07 | 743 | const struct xt_table_info *info, |
d5d1baa1 | 744 | const void *base, struct xt_table_info *newinfo) |
d6a2ba07 | 745 | { |
87a2e70d | 746 | const struct xt_entry_target *t; |
d6a2ba07 PM |
747 | unsigned int entry_offset; |
748 | int off, i, ret; | |
749 | ||
750 | off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
751 | entry_offset = (void *)e - base; | |
752 | ||
d5d1baa1 | 753 | t = arpt_get_target_c(e); |
d6a2ba07 PM |
754 | off += xt_compat_target_offset(t->u.kernel.target); |
755 | newinfo->size -= off; | |
ee999d8b | 756 | ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off); |
d6a2ba07 PM |
757 | if (ret) |
758 | return ret; | |
759 | ||
760 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
761 | if (info->hook_entry[i] && | |
762 | (e < (struct arpt_entry *)(base + info->hook_entry[i]))) | |
763 | newinfo->hook_entry[i] -= off; | |
764 | if (info->underflow[i] && | |
765 | (e < (struct arpt_entry *)(base + info->underflow[i]))) | |
766 | newinfo->underflow[i] -= off; | |
767 | } | |
768 | return 0; | |
769 | } | |
770 | ||
771 | static int compat_table_info(const struct xt_table_info *info, | |
772 | struct xt_table_info *newinfo) | |
773 | { | |
72b2b1dd | 774 | struct arpt_entry *iter; |
711bdde6 | 775 | const void *loc_cpu_entry; |
0559518b | 776 | int ret; |
d6a2ba07 PM |
777 | |
778 | if (!newinfo || !info) | |
779 | return -EINVAL; | |
780 | ||
482cfc31 | 781 | /* we dont care about newinfo->entries */ |
d6a2ba07 PM |
782 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
783 | newinfo->initial_entries = 0; | |
482cfc31 | 784 | loc_cpu_entry = info->entries; |
255d0dc3 | 785 | xt_compat_init_offsets(NFPROTO_ARP, info->number); |
72b2b1dd JE |
786 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
787 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
788 | if (ret != 0) | |
0559518b | 789 | return ret; |
72b2b1dd | 790 | } |
0559518b | 791 | return 0; |
d6a2ba07 PM |
792 | } |
793 | #endif | |
794 | ||
d5d1baa1 | 795 | static int get_info(struct net *net, void __user *user, |
6c28255b | 796 | const int *len, int compat) |
41acd975 | 797 | { |
12b00c2c | 798 | char name[XT_TABLE_MAXNAMELEN]; |
4abff077 | 799 | struct xt_table *t; |
41acd975 PM |
800 | int ret; |
801 | ||
d7cdf816 | 802 | if (*len != sizeof(struct arpt_getinfo)) |
41acd975 | 803 | return -EINVAL; |
41acd975 PM |
804 | |
805 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
806 | return -EFAULT; | |
807 | ||
12b00c2c | 808 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
d6a2ba07 PM |
809 | #ifdef CONFIG_COMPAT |
810 | if (compat) | |
ee999d8b | 811 | xt_compat_lock(NFPROTO_ARP); |
d6a2ba07 | 812 | #endif |
ee999d8b | 813 | t = try_then_request_module(xt_find_table_lock(net, NFPROTO_ARP, name), |
41acd975 | 814 | "arptable_%s", name); |
eb1a6bdc | 815 | if (t) { |
41acd975 | 816 | struct arpt_getinfo info; |
5452e425 | 817 | const struct xt_table_info *private = t->private; |
d6a2ba07 | 818 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
819 | struct xt_table_info tmp; |
820 | ||
d6a2ba07 | 821 | if (compat) { |
d6a2ba07 | 822 | ret = compat_table_info(private, &tmp); |
ee999d8b | 823 | xt_compat_flush_offsets(NFPROTO_ARP); |
d6a2ba07 PM |
824 | private = &tmp; |
825 | } | |
826 | #endif | |
1a8b7a67 | 827 | memset(&info, 0, sizeof(info)); |
41acd975 PM |
828 | info.valid_hooks = t->valid_hooks; |
829 | memcpy(info.hook_entry, private->hook_entry, | |
830 | sizeof(info.hook_entry)); | |
831 | memcpy(info.underflow, private->underflow, | |
832 | sizeof(info.underflow)); | |
833 | info.num_entries = private->number; | |
834 | info.size = private->size; | |
835 | strcpy(info.name, name); | |
836 | ||
837 | if (copy_to_user(user, &info, *len) != 0) | |
838 | ret = -EFAULT; | |
839 | else | |
840 | ret = 0; | |
841 | xt_table_unlock(t); | |
842 | module_put(t->me); | |
843 | } else | |
eb1a6bdc | 844 | ret = -ENOENT; |
d6a2ba07 PM |
845 | #ifdef CONFIG_COMPAT |
846 | if (compat) | |
ee999d8b | 847 | xt_compat_unlock(NFPROTO_ARP); |
d6a2ba07 | 848 | #endif |
41acd975 PM |
849 | return ret; |
850 | } | |
851 | ||
79df341a | 852 | static int get_entries(struct net *net, struct arpt_get_entries __user *uptr, |
d5d1baa1 | 853 | const int *len) |
1da177e4 LT |
854 | { |
855 | int ret; | |
11f6dff8 | 856 | struct arpt_get_entries get; |
4abff077 | 857 | struct xt_table *t; |
1da177e4 | 858 | |
d7cdf816 | 859 | if (*len < sizeof(get)) |
11f6dff8 | 860 | return -EINVAL; |
11f6dff8 PM |
861 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
862 | return -EFAULT; | |
d7cdf816 | 863 | if (*len != sizeof(struct arpt_get_entries) + get.size) |
11f6dff8 | 864 | return -EINVAL; |
d7cdf816 | 865 | |
b301f253 | 866 | get.name[sizeof(get.name) - 1] = '\0'; |
11f6dff8 | 867 | |
ee999d8b | 868 | t = xt_find_table_lock(net, NFPROTO_ARP, get.name); |
eb1a6bdc | 869 | if (t) { |
5452e425 JE |
870 | const struct xt_table_info *private = t->private; |
871 | ||
11f6dff8 | 872 | if (get.size == private->size) |
2e4e6a17 | 873 | ret = copy_entries_to_user(private->size, |
1da177e4 | 874 | t, uptr->entrytable); |
d7cdf816 | 875 | else |
544473c1 | 876 | ret = -EAGAIN; |
d7cdf816 | 877 | |
6b7d31fc | 878 | module_put(t->me); |
2e4e6a17 | 879 | xt_table_unlock(t); |
1da177e4 | 880 | } else |
eb1a6bdc | 881 | ret = -ENOENT; |
1da177e4 LT |
882 | |
883 | return ret; | |
884 | } | |
885 | ||
79df341a AD |
886 | static int __do_replace(struct net *net, const char *name, |
887 | unsigned int valid_hooks, | |
d6a2ba07 PM |
888 | struct xt_table_info *newinfo, |
889 | unsigned int num_counters, | |
890 | void __user *counters_ptr) | |
1da177e4 LT |
891 | { |
892 | int ret; | |
4abff077 | 893 | struct xt_table *t; |
d6a2ba07 | 894 | struct xt_table_info *oldinfo; |
2e4e6a17 | 895 | struct xt_counters *counters; |
d6a2ba07 | 896 | void *loc_cpu_old_entry; |
72b2b1dd | 897 | struct arpt_entry *iter; |
1da177e4 | 898 | |
d6a2ba07 | 899 | ret = 0; |
83723d60 | 900 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
1da177e4 LT |
901 | if (!counters) { |
902 | ret = -ENOMEM; | |
d6a2ba07 | 903 | goto out; |
1da177e4 | 904 | } |
1da177e4 | 905 | |
ee999d8b | 906 | t = try_then_request_module(xt_find_table_lock(net, NFPROTO_ARP, name), |
d6a2ba07 | 907 | "arptable_%s", name); |
eb1a6bdc JL |
908 | if (!t) { |
909 | ret = -ENOENT; | |
1da177e4 | 910 | goto free_newinfo_counters_untrans; |
6b7d31fc | 911 | } |
1da177e4 LT |
912 | |
913 | /* You lied! */ | |
d6a2ba07 | 914 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 915 | ret = -EINVAL; |
6b7d31fc | 916 | goto put_module; |
1da177e4 LT |
917 | } |
918 | ||
d6a2ba07 | 919 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
920 | if (!oldinfo) |
921 | goto put_module; | |
922 | ||
923 | /* Update module usage count based on number of rules */ | |
e905a9ed YH |
924 | if ((oldinfo->number > oldinfo->initial_entries) || |
925 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
926 | module_put(t->me); |
927 | if ((oldinfo->number > oldinfo->initial_entries) && | |
928 | (newinfo->number <= oldinfo->initial_entries)) | |
929 | module_put(t->me); | |
930 | ||
d13e7b2e | 931 | get_old_counters(oldinfo, counters); |
942e4a2b | 932 | |
1da177e4 | 933 | /* Decrease module usage counts and free resource */ |
482cfc31 | 934 | loc_cpu_old_entry = oldinfo->entries; |
72b2b1dd | 935 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 936 | cleanup_entry(iter); |
31836064 | 937 | |
2e4e6a17 | 938 | xt_free_table_info(oldinfo); |
d6a2ba07 | 939 | if (copy_to_user(counters_ptr, counters, |
c58dd2dd TG |
940 | sizeof(struct xt_counters) * num_counters) != 0) { |
941 | /* Silent error, can't fail, new table is already in place */ | |
942 | net_warn_ratelimited("arptables: counters copy to user failed while replacing table\n"); | |
943 | } | |
1da177e4 | 944 | vfree(counters); |
2e4e6a17 | 945 | xt_table_unlock(t); |
1da177e4 LT |
946 | return ret; |
947 | ||
948 | put_module: | |
949 | module_put(t->me); | |
2e4e6a17 | 950 | xt_table_unlock(t); |
1da177e4 | 951 | free_newinfo_counters_untrans: |
1da177e4 | 952 | vfree(counters); |
d6a2ba07 PM |
953 | out: |
954 | return ret; | |
955 | } | |
956 | ||
d5d1baa1 | 957 | static int do_replace(struct net *net, const void __user *user, |
6c28255b | 958 | unsigned int len) |
d6a2ba07 PM |
959 | { |
960 | int ret; | |
961 | struct arpt_replace tmp; | |
962 | struct xt_table_info *newinfo; | |
963 | void *loc_cpu_entry; | |
72b2b1dd | 964 | struct arpt_entry *iter; |
d6a2ba07 PM |
965 | |
966 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
967 | return -EFAULT; | |
968 | ||
969 | /* overflow check */ | |
970 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
971 | return -ENOMEM; | |
1086bbe9 DJ |
972 | if (tmp.num_counters == 0) |
973 | return -EINVAL; | |
974 | ||
42eab94f | 975 | tmp.name[sizeof(tmp.name)-1] = 0; |
d6a2ba07 PM |
976 | |
977 | newinfo = xt_alloc_table_info(tmp.size); | |
978 | if (!newinfo) | |
979 | return -ENOMEM; | |
980 | ||
482cfc31 | 981 | loc_cpu_entry = newinfo->entries; |
d6a2ba07 PM |
982 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
983 | tmp.size) != 0) { | |
984 | ret = -EFAULT; | |
985 | goto free_newinfo; | |
986 | } | |
987 | ||
0f234214 | 988 | ret = translate_table(newinfo, loc_cpu_entry, &tmp); |
d6a2ba07 PM |
989 | if (ret != 0) |
990 | goto free_newinfo; | |
991 | ||
79df341a | 992 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
d6a2ba07 PM |
993 | tmp.num_counters, tmp.counters); |
994 | if (ret) | |
995 | goto free_newinfo_untrans; | |
996 | return 0; | |
997 | ||
998 | free_newinfo_untrans: | |
72b2b1dd | 999 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1000 | cleanup_entry(iter); |
1da177e4 | 1001 | free_newinfo: |
2e4e6a17 | 1002 | xt_free_table_info(newinfo); |
1da177e4 LT |
1003 | return ret; |
1004 | } | |
1005 | ||
d5d1baa1 JE |
1006 | static int do_add_counters(struct net *net, const void __user *user, |
1007 | unsigned int len, int compat) | |
1da177e4 | 1008 | { |
482cfc31 | 1009 | unsigned int i; |
d6a2ba07 PM |
1010 | struct xt_counters_info tmp; |
1011 | struct xt_counters *paddc; | |
4abff077 | 1012 | struct xt_table *t; |
5452e425 | 1013 | const struct xt_table_info *private; |
6b7d31fc | 1014 | int ret = 0; |
72b2b1dd | 1015 | struct arpt_entry *iter; |
7f5c6d4f | 1016 | unsigned int addend; |
d6a2ba07 | 1017 | |
d7591f0c FW |
1018 | paddc = xt_copy_counters_from_user(user, len, &tmp, compat); |
1019 | if (IS_ERR(paddc)) | |
1020 | return PTR_ERR(paddc); | |
1da177e4 | 1021 | |
d7591f0c | 1022 | t = xt_find_table_lock(net, NFPROTO_ARP, tmp.name); |
eb1a6bdc JL |
1023 | if (!t) { |
1024 | ret = -ENOENT; | |
1da177e4 | 1025 | goto free; |
6b7d31fc | 1026 | } |
1da177e4 | 1027 | |
942e4a2b | 1028 | local_bh_disable(); |
2e4e6a17 | 1029 | private = t->private; |
d7591f0c | 1030 | if (private->number != tmp.num_counters) { |
1da177e4 LT |
1031 | ret = -EINVAL; |
1032 | goto unlock_up_free; | |
1033 | } | |
1034 | ||
1035 | i = 0; | |
482cfc31 | 1036 | |
7f5c6d4f | 1037 | addend = xt_write_recseq_begin(); |
482cfc31 | 1038 | xt_entry_foreach(iter, private->entries, private->size) { |
71ae0dff FW |
1039 | struct xt_counters *tmp; |
1040 | ||
1041 | tmp = xt_get_this_cpu_counter(&iter->counters); | |
1042 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); | |
0559518b JE |
1043 | ++i; |
1044 | } | |
7f5c6d4f | 1045 | xt_write_recseq_end(addend); |
1da177e4 | 1046 | unlock_up_free: |
942e4a2b | 1047 | local_bh_enable(); |
2e4e6a17 | 1048 | xt_table_unlock(t); |
6b7d31fc | 1049 | module_put(t->me); |
1da177e4 LT |
1050 | free: |
1051 | vfree(paddc); | |
1052 | ||
1053 | return ret; | |
1054 | } | |
1055 | ||
d6a2ba07 | 1056 | #ifdef CONFIG_COMPAT |
8dddd327 FW |
1057 | struct compat_arpt_replace { |
1058 | char name[XT_TABLE_MAXNAMELEN]; | |
1059 | u32 valid_hooks; | |
1060 | u32 num_entries; | |
1061 | u32 size; | |
1062 | u32 hook_entry[NF_ARP_NUMHOOKS]; | |
1063 | u32 underflow[NF_ARP_NUMHOOKS]; | |
1064 | u32 num_counters; | |
1065 | compat_uptr_t counters; | |
1066 | struct compat_arpt_entry entries[0]; | |
1067 | }; | |
1068 | ||
0559518b | 1069 | static inline void compat_release_entry(struct compat_arpt_entry *e) |
d6a2ba07 | 1070 | { |
87a2e70d | 1071 | struct xt_entry_target *t; |
d6a2ba07 | 1072 | |
d6a2ba07 PM |
1073 | t = compat_arpt_get_target(e); |
1074 | module_put(t->u.kernel.target->me); | |
d6a2ba07 PM |
1075 | } |
1076 | ||
09d96860 | 1077 | static int |
d6a2ba07 PM |
1078 | check_compat_entry_size_and_hooks(struct compat_arpt_entry *e, |
1079 | struct xt_table_info *newinfo, | |
1080 | unsigned int *size, | |
d5d1baa1 | 1081 | const unsigned char *base, |
09d96860 | 1082 | const unsigned char *limit) |
d6a2ba07 | 1083 | { |
87a2e70d | 1084 | struct xt_entry_target *t; |
d6a2ba07 PM |
1085 | struct xt_target *target; |
1086 | unsigned int entry_offset; | |
09d96860 | 1087 | int ret, off; |
d6a2ba07 | 1088 | |
3666ed1c | 1089 | if ((unsigned long)e % __alignof__(struct compat_arpt_entry) != 0 || |
6e94e0cf | 1090 | (unsigned char *)e + sizeof(struct compat_arpt_entry) >= limit || |
d7cdf816 | 1091 | (unsigned char *)e + e->next_offset > limit) |
d6a2ba07 | 1092 | return -EINVAL; |
d6a2ba07 PM |
1093 | |
1094 | if (e->next_offset < sizeof(struct compat_arpt_entry) + | |
d7cdf816 | 1095 | sizeof(struct compat_xt_entry_target)) |
d6a2ba07 | 1096 | return -EINVAL; |
d6a2ba07 | 1097 | |
aa412ba2 FW |
1098 | if (!arp_checkentry(&e->arp)) |
1099 | return -EINVAL; | |
1100 | ||
ce683e5f | 1101 | ret = xt_compat_check_entry_offsets(e, e->elems, e->target_offset, |
fc1221b3 | 1102 | e->next_offset); |
d6a2ba07 PM |
1103 | if (ret) |
1104 | return ret; | |
1105 | ||
1106 | off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
1107 | entry_offset = (void *)e - (void *)base; | |
1108 | ||
1109 | t = compat_arpt_get_target(e); | |
d2a7b6ba JE |
1110 | target = xt_request_find_target(NFPROTO_ARP, t->u.user.name, |
1111 | t->u.user.revision); | |
1112 | if (IS_ERR(target)) { | |
d2a7b6ba | 1113 | ret = PTR_ERR(target); |
d6a2ba07 PM |
1114 | goto out; |
1115 | } | |
1116 | t->u.kernel.target = target; | |
1117 | ||
1118 | off += xt_compat_target_offset(target); | |
1119 | *size += off; | |
ee999d8b | 1120 | ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off); |
d6a2ba07 PM |
1121 | if (ret) |
1122 | goto release_target; | |
1123 | ||
d6a2ba07 PM |
1124 | return 0; |
1125 | ||
1126 | release_target: | |
1127 | module_put(t->u.kernel.target->me); | |
1128 | out: | |
1129 | return ret; | |
1130 | } | |
1131 | ||
0188346f | 1132 | static void |
d6a2ba07 | 1133 | compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr, |
8dddd327 | 1134 | unsigned int *size, |
d6a2ba07 PM |
1135 | struct xt_table_info *newinfo, unsigned char *base) |
1136 | { | |
87a2e70d | 1137 | struct xt_entry_target *t; |
d6a2ba07 PM |
1138 | struct arpt_entry *de; |
1139 | unsigned int origsize; | |
0188346f | 1140 | int h; |
d6a2ba07 | 1141 | |
d6a2ba07 | 1142 | origsize = *size; |
68ad546a | 1143 | de = *dstptr; |
d6a2ba07 PM |
1144 | memcpy(de, e, sizeof(struct arpt_entry)); |
1145 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1146 | ||
1147 | *dstptr += sizeof(struct arpt_entry); | |
1148 | *size += sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
1149 | ||
1150 | de->target_offset = e->target_offset - (origsize - *size); | |
1151 | t = compat_arpt_get_target(e); | |
d6a2ba07 PM |
1152 | xt_compat_target_from_user(t, dstptr, size); |
1153 | ||
1154 | de->next_offset = e->next_offset - (origsize - *size); | |
1155 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { | |
1156 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1157 | newinfo->hook_entry[h] -= origsize - *size; | |
1158 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1159 | newinfo->underflow[h] -= origsize - *size; | |
1160 | } | |
d6a2ba07 PM |
1161 | } |
1162 | ||
8dddd327 | 1163 | static int translate_compat_table(struct xt_table_info **pinfo, |
d6a2ba07 | 1164 | void **pentry0, |
8dddd327 | 1165 | const struct compat_arpt_replace *compatr) |
d6a2ba07 PM |
1166 | { |
1167 | unsigned int i, j; | |
1168 | struct xt_table_info *newinfo, *info; | |
1169 | void *pos, *entry0, *entry1; | |
72b2b1dd | 1170 | struct compat_arpt_entry *iter0; |
09d96860 | 1171 | struct arpt_replace repl; |
d6a2ba07 | 1172 | unsigned int size; |
72b2b1dd | 1173 | int ret = 0; |
d6a2ba07 PM |
1174 | |
1175 | info = *pinfo; | |
1176 | entry0 = *pentry0; | |
8dddd327 FW |
1177 | size = compatr->size; |
1178 | info->number = compatr->num_entries; | |
d6a2ba07 | 1179 | |
d6a2ba07 | 1180 | j = 0; |
ee999d8b | 1181 | xt_compat_lock(NFPROTO_ARP); |
8dddd327 | 1182 | xt_compat_init_offsets(NFPROTO_ARP, compatr->num_entries); |
d6a2ba07 | 1183 | /* Walk through entries, checking offsets. */ |
8dddd327 | 1184 | xt_entry_foreach(iter0, entry0, compatr->size) { |
72b2b1dd | 1185 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
6b4ff2d7 | 1186 | entry0, |
09d96860 | 1187 | entry0 + compatr->size); |
72b2b1dd | 1188 | if (ret != 0) |
0559518b JE |
1189 | goto out_unlock; |
1190 | ++j; | |
72b2b1dd | 1191 | } |
d6a2ba07 PM |
1192 | |
1193 | ret = -EINVAL; | |
d7cdf816 | 1194 | if (j != compatr->num_entries) |
d6a2ba07 | 1195 | goto out_unlock; |
d6a2ba07 | 1196 | |
d6a2ba07 PM |
1197 | ret = -ENOMEM; |
1198 | newinfo = xt_alloc_table_info(size); | |
1199 | if (!newinfo) | |
1200 | goto out_unlock; | |
1201 | ||
8dddd327 | 1202 | newinfo->number = compatr->num_entries; |
d6a2ba07 | 1203 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { |
17a49cd5 HJ |
1204 | newinfo->hook_entry[i] = compatr->hook_entry[i]; |
1205 | newinfo->underflow[i] = compatr->underflow[i]; | |
d6a2ba07 | 1206 | } |
482cfc31 | 1207 | entry1 = newinfo->entries; |
d6a2ba07 | 1208 | pos = entry1; |
8dddd327 | 1209 | size = compatr->size; |
0188346f FW |
1210 | xt_entry_foreach(iter0, entry0, compatr->size) |
1211 | compat_copy_entry_from_user(iter0, &pos, &size, | |
1212 | newinfo, entry1); | |
09d96860 FW |
1213 | |
1214 | /* all module references in entry0 are now gone */ | |
1215 | ||
ee999d8b JE |
1216 | xt_compat_flush_offsets(NFPROTO_ARP); |
1217 | xt_compat_unlock(NFPROTO_ARP); | |
d6a2ba07 | 1218 | |
09d96860 | 1219 | memcpy(&repl, compatr, sizeof(*compatr)); |
71ae0dff | 1220 | |
09d96860 FW |
1221 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { |
1222 | repl.hook_entry[i] = newinfo->hook_entry[i]; | |
1223 | repl.underflow[i] = newinfo->underflow[i]; | |
d6a2ba07 PM |
1224 | } |
1225 | ||
09d96860 FW |
1226 | repl.num_counters = 0; |
1227 | repl.counters = NULL; | |
1228 | repl.size = newinfo->size; | |
1229 | ret = translate_table(newinfo, entry1, &repl); | |
1230 | if (ret) | |
1231 | goto free_newinfo; | |
1232 | ||
d6a2ba07 PM |
1233 | *pinfo = newinfo; |
1234 | *pentry0 = entry1; | |
1235 | xt_free_table_info(info); | |
1236 | return 0; | |
1237 | ||
1238 | free_newinfo: | |
1239 | xt_free_table_info(newinfo); | |
09d96860 FW |
1240 | return ret; |
1241 | out_unlock: | |
1242 | xt_compat_flush_offsets(NFPROTO_ARP); | |
1243 | xt_compat_unlock(NFPROTO_ARP); | |
8dddd327 | 1244 | xt_entry_foreach(iter0, entry0, compatr->size) { |
0559518b | 1245 | if (j-- == 0) |
72b2b1dd | 1246 | break; |
0559518b JE |
1247 | compat_release_entry(iter0); |
1248 | } | |
d6a2ba07 | 1249 | return ret; |
d6a2ba07 PM |
1250 | } |
1251 | ||
79df341a AD |
1252 | static int compat_do_replace(struct net *net, void __user *user, |
1253 | unsigned int len) | |
d6a2ba07 PM |
1254 | { |
1255 | int ret; | |
1256 | struct compat_arpt_replace tmp; | |
1257 | struct xt_table_info *newinfo; | |
1258 | void *loc_cpu_entry; | |
72b2b1dd | 1259 | struct arpt_entry *iter; |
d6a2ba07 PM |
1260 | |
1261 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1262 | return -EFAULT; | |
1263 | ||
1264 | /* overflow check */ | |
d6a2ba07 PM |
1265 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
1266 | return -ENOMEM; | |
1086bbe9 DJ |
1267 | if (tmp.num_counters == 0) |
1268 | return -EINVAL; | |
1269 | ||
42eab94f | 1270 | tmp.name[sizeof(tmp.name)-1] = 0; |
d6a2ba07 PM |
1271 | |
1272 | newinfo = xt_alloc_table_info(tmp.size); | |
1273 | if (!newinfo) | |
1274 | return -ENOMEM; | |
1275 | ||
482cfc31 | 1276 | loc_cpu_entry = newinfo->entries; |
d6a2ba07 PM |
1277 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), tmp.size) != 0) { |
1278 | ret = -EFAULT; | |
1279 | goto free_newinfo; | |
1280 | } | |
1281 | ||
8dddd327 | 1282 | ret = translate_compat_table(&newinfo, &loc_cpu_entry, &tmp); |
d6a2ba07 PM |
1283 | if (ret != 0) |
1284 | goto free_newinfo; | |
1285 | ||
79df341a | 1286 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
d6a2ba07 PM |
1287 | tmp.num_counters, compat_ptr(tmp.counters)); |
1288 | if (ret) | |
1289 | goto free_newinfo_untrans; | |
1290 | return 0; | |
1291 | ||
1292 | free_newinfo_untrans: | |
72b2b1dd | 1293 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1294 | cleanup_entry(iter); |
d6a2ba07 PM |
1295 | free_newinfo: |
1296 | xt_free_table_info(newinfo); | |
1297 | return ret; | |
1298 | } | |
1299 | ||
1300 | static int compat_do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1301 | unsigned int len) | |
1302 | { | |
1303 | int ret; | |
1304 | ||
52e804c6 | 1305 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
d6a2ba07 PM |
1306 | return -EPERM; |
1307 | ||
1308 | switch (cmd) { | |
1309 | case ARPT_SO_SET_REPLACE: | |
3b1e0a65 | 1310 | ret = compat_do_replace(sock_net(sk), user, len); |
d6a2ba07 PM |
1311 | break; |
1312 | ||
1313 | case ARPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1314 | ret = do_add_counters(sock_net(sk), user, len, 1); |
d6a2ba07 PM |
1315 | break; |
1316 | ||
1317 | default: | |
d6a2ba07 PM |
1318 | ret = -EINVAL; |
1319 | } | |
1320 | ||
1321 | return ret; | |
1322 | } | |
1323 | ||
1324 | static int compat_copy_entry_to_user(struct arpt_entry *e, void __user **dstptr, | |
1325 | compat_uint_t *size, | |
1326 | struct xt_counters *counters, | |
0559518b | 1327 | unsigned int i) |
d6a2ba07 | 1328 | { |
87a2e70d | 1329 | struct xt_entry_target *t; |
d6a2ba07 PM |
1330 | struct compat_arpt_entry __user *ce; |
1331 | u_int16_t target_offset, next_offset; | |
1332 | compat_uint_t origsize; | |
1333 | int ret; | |
1334 | ||
d6a2ba07 | 1335 | origsize = *size; |
68ad546a | 1336 | ce = *dstptr; |
0559518b JE |
1337 | if (copy_to_user(ce, e, sizeof(struct arpt_entry)) != 0 || |
1338 | copy_to_user(&ce->counters, &counters[i], | |
1339 | sizeof(counters[i])) != 0) | |
1340 | return -EFAULT; | |
d6a2ba07 PM |
1341 | |
1342 | *dstptr += sizeof(struct compat_arpt_entry); | |
1343 | *size -= sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
1344 | ||
1345 | target_offset = e->target_offset - (origsize - *size); | |
1346 | ||
1347 | t = arpt_get_target(e); | |
1348 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1349 | if (ret) | |
0559518b | 1350 | return ret; |
d6a2ba07 | 1351 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1352 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1353 | put_user(next_offset, &ce->next_offset) != 0) | |
1354 | return -EFAULT; | |
d6a2ba07 | 1355 | return 0; |
d6a2ba07 PM |
1356 | } |
1357 | ||
1358 | static int compat_copy_entries_to_user(unsigned int total_size, | |
4abff077 | 1359 | struct xt_table *table, |
d6a2ba07 PM |
1360 | void __user *userptr) |
1361 | { | |
1362 | struct xt_counters *counters; | |
5452e425 | 1363 | const struct xt_table_info *private = table->private; |
d6a2ba07 PM |
1364 | void __user *pos; |
1365 | unsigned int size; | |
1366 | int ret = 0; | |
d6a2ba07 | 1367 | unsigned int i = 0; |
72b2b1dd | 1368 | struct arpt_entry *iter; |
d6a2ba07 PM |
1369 | |
1370 | counters = alloc_counters(table); | |
1371 | if (IS_ERR(counters)) | |
1372 | return PTR_ERR(counters); | |
1373 | ||
d6a2ba07 PM |
1374 | pos = userptr; |
1375 | size = total_size; | |
482cfc31 | 1376 | xt_entry_foreach(iter, private->entries, total_size) { |
72b2b1dd | 1377 | ret = compat_copy_entry_to_user(iter, &pos, |
6b4ff2d7 | 1378 | &size, counters, i++); |
72b2b1dd JE |
1379 | if (ret != 0) |
1380 | break; | |
1381 | } | |
d6a2ba07 PM |
1382 | vfree(counters); |
1383 | return ret; | |
1384 | } | |
1385 | ||
1386 | struct compat_arpt_get_entries { | |
12b00c2c | 1387 | char name[XT_TABLE_MAXNAMELEN]; |
d6a2ba07 PM |
1388 | compat_uint_t size; |
1389 | struct compat_arpt_entry entrytable[0]; | |
1390 | }; | |
1391 | ||
79df341a AD |
1392 | static int compat_get_entries(struct net *net, |
1393 | struct compat_arpt_get_entries __user *uptr, | |
d6a2ba07 PM |
1394 | int *len) |
1395 | { | |
1396 | int ret; | |
1397 | struct compat_arpt_get_entries get; | |
4abff077 | 1398 | struct xt_table *t; |
d6a2ba07 | 1399 | |
d7cdf816 | 1400 | if (*len < sizeof(get)) |
d6a2ba07 | 1401 | return -EINVAL; |
d6a2ba07 PM |
1402 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
1403 | return -EFAULT; | |
d7cdf816 | 1404 | if (*len != sizeof(struct compat_arpt_get_entries) + get.size) |
d6a2ba07 | 1405 | return -EINVAL; |
d7cdf816 | 1406 | |
b301f253 | 1407 | get.name[sizeof(get.name) - 1] = '\0'; |
d6a2ba07 | 1408 | |
ee999d8b JE |
1409 | xt_compat_lock(NFPROTO_ARP); |
1410 | t = xt_find_table_lock(net, NFPROTO_ARP, get.name); | |
eb1a6bdc | 1411 | if (t) { |
5452e425 | 1412 | const struct xt_table_info *private = t->private; |
d6a2ba07 PM |
1413 | struct xt_table_info info; |
1414 | ||
d6a2ba07 PM |
1415 | ret = compat_table_info(private, &info); |
1416 | if (!ret && get.size == info.size) { | |
1417 | ret = compat_copy_entries_to_user(private->size, | |
1418 | t, uptr->entrytable); | |
d7cdf816 | 1419 | } else if (!ret) |
544473c1 | 1420 | ret = -EAGAIN; |
d7cdf816 | 1421 | |
ee999d8b | 1422 | xt_compat_flush_offsets(NFPROTO_ARP); |
d6a2ba07 PM |
1423 | module_put(t->me); |
1424 | xt_table_unlock(t); | |
1425 | } else | |
eb1a6bdc | 1426 | ret = -ENOENT; |
d6a2ba07 | 1427 | |
ee999d8b | 1428 | xt_compat_unlock(NFPROTO_ARP); |
d6a2ba07 PM |
1429 | return ret; |
1430 | } | |
1431 | ||
1432 | static int do_arpt_get_ctl(struct sock *, int, void __user *, int *); | |
1433 | ||
1434 | static int compat_do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, | |
1435 | int *len) | |
1436 | { | |
1437 | int ret; | |
1438 | ||
52e804c6 | 1439 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
d6a2ba07 PM |
1440 | return -EPERM; |
1441 | ||
1442 | switch (cmd) { | |
1443 | case ARPT_SO_GET_INFO: | |
3b1e0a65 | 1444 | ret = get_info(sock_net(sk), user, len, 1); |
d6a2ba07 PM |
1445 | break; |
1446 | case ARPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1447 | ret = compat_get_entries(sock_net(sk), user, len); |
d6a2ba07 PM |
1448 | break; |
1449 | default: | |
1450 | ret = do_arpt_get_ctl(sk, cmd, user, len); | |
1451 | } | |
1452 | return ret; | |
1453 | } | |
1454 | #endif | |
1455 | ||
1da177e4 LT |
1456 | static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1457 | { | |
1458 | int ret; | |
1459 | ||
52e804c6 | 1460 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1461 | return -EPERM; |
1462 | ||
1463 | switch (cmd) { | |
1464 | case ARPT_SO_SET_REPLACE: | |
3b1e0a65 | 1465 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1466 | break; |
1467 | ||
1468 | case ARPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1469 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
1470 | break; |
1471 | ||
1472 | default: | |
1da177e4 LT |
1473 | ret = -EINVAL; |
1474 | } | |
1475 | ||
1476 | return ret; | |
1477 | } | |
1478 | ||
1479 | static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1480 | { | |
1481 | int ret; | |
1482 | ||
52e804c6 | 1483 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1484 | return -EPERM; |
1485 | ||
1486 | switch (cmd) { | |
41acd975 | 1487 | case ARPT_SO_GET_INFO: |
3b1e0a65 | 1488 | ret = get_info(sock_net(sk), user, len, 0); |
41acd975 | 1489 | break; |
1da177e4 | 1490 | |
11f6dff8 | 1491 | case ARPT_SO_GET_ENTRIES: |
3b1e0a65 | 1492 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 1493 | break; |
1da177e4 | 1494 | |
6b7d31fc | 1495 | case ARPT_SO_GET_REVISION_TARGET: { |
2e4e6a17 | 1496 | struct xt_get_revision rev; |
6b7d31fc HW |
1497 | |
1498 | if (*len != sizeof(rev)) { | |
1499 | ret = -EINVAL; | |
1500 | break; | |
1501 | } | |
1502 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1503 | ret = -EFAULT; | |
1504 | break; | |
1505 | } | |
42eab94f | 1506 | rev.name[sizeof(rev.name)-1] = 0; |
6b7d31fc | 1507 | |
ee999d8b | 1508 | try_then_request_module(xt_find_revision(NFPROTO_ARP, rev.name, |
2e4e6a17 | 1509 | rev.revision, 1, &ret), |
6b7d31fc HW |
1510 | "arpt_%s", rev.name); |
1511 | break; | |
1512 | } | |
1513 | ||
1da177e4 | 1514 | default: |
1da177e4 LT |
1515 | ret = -EINVAL; |
1516 | } | |
1517 | ||
1518 | return ret; | |
1519 | } | |
1520 | ||
b9e69e12 FW |
1521 | static void __arpt_unregister_table(struct xt_table *table) |
1522 | { | |
1523 | struct xt_table_info *private; | |
1524 | void *loc_cpu_entry; | |
1525 | struct module *table_owner = table->me; | |
1526 | struct arpt_entry *iter; | |
1527 | ||
1528 | private = xt_unregister_table(table); | |
1529 | ||
1530 | /* Decrease module usage counts and free resources */ | |
1531 | loc_cpu_entry = private->entries; | |
1532 | xt_entry_foreach(iter, loc_cpu_entry, private->size) | |
1533 | cleanup_entry(iter); | |
1534 | if (private->number > private->initial_entries) | |
1535 | module_put(table_owner); | |
1536 | xt_free_table_info(private); | |
1537 | } | |
1538 | ||
a67dd266 FW |
1539 | int arpt_register_table(struct net *net, |
1540 | const struct xt_table *table, | |
1541 | const struct arpt_replace *repl, | |
1542 | const struct nf_hook_ops *ops, | |
1543 | struct xt_table **res) | |
1da177e4 LT |
1544 | { |
1545 | int ret; | |
2e4e6a17 | 1546 | struct xt_table_info *newinfo; |
f3c5c1bf | 1547 | struct xt_table_info bootstrap = {0}; |
31836064 | 1548 | void *loc_cpu_entry; |
a98da11d | 1549 | struct xt_table *new_table; |
1da177e4 | 1550 | |
2e4e6a17 | 1551 | newinfo = xt_alloc_table_info(repl->size); |
a67dd266 FW |
1552 | if (!newinfo) |
1553 | return -ENOMEM; | |
31836064 | 1554 | |
482cfc31 | 1555 | loc_cpu_entry = newinfo->entries; |
31836064 | 1556 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
1da177e4 | 1557 | |
0f234214 | 1558 | ret = translate_table(newinfo, loc_cpu_entry, repl); |
44d34e72 AD |
1559 | if (ret != 0) |
1560 | goto out_free; | |
1da177e4 | 1561 | |
79df341a | 1562 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 1563 | if (IS_ERR(new_table)) { |
44d34e72 AD |
1564 | ret = PTR_ERR(new_table); |
1565 | goto out_free; | |
1da177e4 | 1566 | } |
a67dd266 | 1567 | |
b9e69e12 | 1568 | /* set res now, will see skbs right after nf_register_net_hooks */ |
a67dd266 FW |
1569 | WRITE_ONCE(*res, new_table); |
1570 | ||
b9e69e12 FW |
1571 | ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks)); |
1572 | if (ret != 0) { | |
1573 | __arpt_unregister_table(new_table); | |
1574 | *res = NULL; | |
1575 | } | |
1576 | ||
a67dd266 | 1577 | return ret; |
1da177e4 | 1578 | |
44d34e72 AD |
1579 | out_free: |
1580 | xt_free_table_info(newinfo); | |
a67dd266 | 1581 | return ret; |
1da177e4 LT |
1582 | } |
1583 | ||
a67dd266 FW |
1584 | void arpt_unregister_table(struct net *net, struct xt_table *table, |
1585 | const struct nf_hook_ops *ops) | |
1da177e4 | 1586 | { |
b9e69e12 FW |
1587 | nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks)); |
1588 | __arpt_unregister_table(table); | |
1da177e4 LT |
1589 | } |
1590 | ||
1591 | /* The built-in targets: standard (NULL) and error. */ | |
4538506b JE |
1592 | static struct xt_target arpt_builtin_tg[] __read_mostly = { |
1593 | { | |
243bf6e2 | 1594 | .name = XT_STANDARD_TARGET, |
4538506b JE |
1595 | .targetsize = sizeof(int), |
1596 | .family = NFPROTO_ARP, | |
d6a2ba07 | 1597 | #ifdef CONFIG_COMPAT |
4538506b JE |
1598 | .compatsize = sizeof(compat_int_t), |
1599 | .compat_from_user = compat_standard_from_user, | |
1600 | .compat_to_user = compat_standard_to_user, | |
d6a2ba07 | 1601 | #endif |
4538506b JE |
1602 | }, |
1603 | { | |
243bf6e2 | 1604 | .name = XT_ERROR_TARGET, |
4538506b | 1605 | .target = arpt_error, |
12b00c2c | 1606 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
1607 | .family = NFPROTO_ARP, |
1608 | }, | |
1da177e4 LT |
1609 | }; |
1610 | ||
1611 | static struct nf_sockopt_ops arpt_sockopts = { | |
1612 | .pf = PF_INET, | |
1613 | .set_optmin = ARPT_BASE_CTL, | |
1614 | .set_optmax = ARPT_SO_SET_MAX+1, | |
1615 | .set = do_arpt_set_ctl, | |
d6a2ba07 PM |
1616 | #ifdef CONFIG_COMPAT |
1617 | .compat_set = compat_do_arpt_set_ctl, | |
1618 | #endif | |
1da177e4 LT |
1619 | .get_optmin = ARPT_BASE_CTL, |
1620 | .get_optmax = ARPT_SO_GET_MAX+1, | |
1621 | .get = do_arpt_get_ctl, | |
d6a2ba07 PM |
1622 | #ifdef CONFIG_COMPAT |
1623 | .compat_get = compat_do_arpt_get_ctl, | |
1624 | #endif | |
16fcec35 | 1625 | .owner = THIS_MODULE, |
1da177e4 LT |
1626 | }; |
1627 | ||
3cb609d5 AD |
1628 | static int __net_init arp_tables_net_init(struct net *net) |
1629 | { | |
ee999d8b | 1630 | return xt_proto_init(net, NFPROTO_ARP); |
3cb609d5 AD |
1631 | } |
1632 | ||
1633 | static void __net_exit arp_tables_net_exit(struct net *net) | |
1634 | { | |
ee999d8b | 1635 | xt_proto_fini(net, NFPROTO_ARP); |
3cb609d5 AD |
1636 | } |
1637 | ||
1638 | static struct pernet_operations arp_tables_net_ops = { | |
1639 | .init = arp_tables_net_init, | |
1640 | .exit = arp_tables_net_exit, | |
1641 | }; | |
1642 | ||
65b4b4e8 | 1643 | static int __init arp_tables_init(void) |
1da177e4 LT |
1644 | { |
1645 | int ret; | |
1646 | ||
3cb609d5 | 1647 | ret = register_pernet_subsys(&arp_tables_net_ops); |
0eff66e6 PM |
1648 | if (ret < 0) |
1649 | goto err1; | |
2e4e6a17 | 1650 | |
25985edc | 1651 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 1652 | ret = xt_register_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg)); |
0eff66e6 PM |
1653 | if (ret < 0) |
1654 | goto err2; | |
1da177e4 LT |
1655 | |
1656 | /* Register setsockopt */ | |
1657 | ret = nf_register_sockopt(&arpt_sockopts); | |
0eff66e6 PM |
1658 | if (ret < 0) |
1659 | goto err4; | |
1da177e4 | 1660 | |
09605cc1 | 1661 | pr_info("arp_tables: (C) 2002 David S. Miller\n"); |
1da177e4 | 1662 | return 0; |
0eff66e6 PM |
1663 | |
1664 | err4: | |
4538506b | 1665 | xt_unregister_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg)); |
0eff66e6 | 1666 | err2: |
3cb609d5 | 1667 | unregister_pernet_subsys(&arp_tables_net_ops); |
0eff66e6 PM |
1668 | err1: |
1669 | return ret; | |
1da177e4 LT |
1670 | } |
1671 | ||
65b4b4e8 | 1672 | static void __exit arp_tables_fini(void) |
1da177e4 LT |
1673 | { |
1674 | nf_unregister_sockopt(&arpt_sockopts); | |
4538506b | 1675 | xt_unregister_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg)); |
3cb609d5 | 1676 | unregister_pernet_subsys(&arp_tables_net_ops); |
1da177e4 LT |
1677 | } |
1678 | ||
1679 | EXPORT_SYMBOL(arpt_register_table); | |
1680 | EXPORT_SYMBOL(arpt_unregister_table); | |
1681 | EXPORT_SYMBOL(arpt_do_table); | |
1da177e4 | 1682 | |
65b4b4e8 AM |
1683 | module_init(arp_tables_init); |
1684 | module_exit(arp_tables_fini); |