Commit | Line | Data |
---|---|---|
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) | |
9 | * | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/skbuff.h> | |
14 | #include <linux/netdevice.h> | |
4fc268d2 | 15 | #include <linux/capability.h> |
1da177e4 LT |
16 | #include <linux/if_arp.h> |
17 | #include <linux/kmod.h> | |
18 | #include <linux/vmalloc.h> | |
19 | #include <linux/proc_fs.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/init.h> | |
57b47a53 | 22 | #include <linux/mutex.h> |
d6a2ba07 PM |
23 | #include <linux/err.h> |
24 | #include <net/compat.h> | |
25 | #include <asm/uaccess.h> | |
1da177e4 | 26 | |
2e4e6a17 | 27 | #include <linux/netfilter/x_tables.h> |
1da177e4 LT |
28 | #include <linux/netfilter_arp/arp_tables.h> |
29 | ||
30 | MODULE_LICENSE("GPL"); | |
31 | MODULE_AUTHOR("David S. Miller <davem@redhat.com>"); | |
32 | MODULE_DESCRIPTION("arptables core"); | |
33 | ||
34 | /*#define DEBUG_ARP_TABLES*/ | |
35 | /*#define DEBUG_ARP_TABLES_USER*/ | |
36 | ||
37 | #ifdef DEBUG_ARP_TABLES | |
38 | #define dprintf(format, args...) printk(format , ## args) | |
39 | #else | |
40 | #define dprintf(format, args...) | |
41 | #endif | |
42 | ||
43 | #ifdef DEBUG_ARP_TABLES_USER | |
44 | #define duprintf(format, args...) printk(format , ## args) | |
45 | #else | |
46 | #define duprintf(format, args...) | |
47 | #endif | |
48 | ||
49 | #ifdef CONFIG_NETFILTER_DEBUG | |
50 | #define ARP_NF_ASSERT(x) \ | |
51 | do { \ | |
52 | if (!(x)) \ | |
53 | printk("ARP_NF_ASSERT: %s:%s:%u\n", \ | |
54 | __FUNCTION__, __FILE__, __LINE__); \ | |
55 | } while(0) | |
56 | #else | |
57 | #define ARP_NF_ASSERT(x) | |
58 | #endif | |
1da177e4 | 59 | |
1da177e4 LT |
60 | static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap, |
61 | char *hdr_addr, int len) | |
62 | { | |
63 | int i, ret; | |
64 | ||
65 | if (len > ARPT_DEV_ADDR_LEN_MAX) | |
66 | len = ARPT_DEV_ADDR_LEN_MAX; | |
67 | ||
68 | ret = 0; | |
69 | for (i = 0; i < len; i++) | |
70 | ret |= (hdr_addr[i] ^ ap->addr[i]) & ap->mask[i]; | |
71 | ||
72 | return (ret != 0); | |
73 | } | |
74 | ||
75 | /* Returns whether packet matches rule or not. */ | |
76 | static inline int arp_packet_match(const struct arphdr *arphdr, | |
77 | struct net_device *dev, | |
78 | const char *indev, | |
79 | const char *outdev, | |
80 | const struct arpt_arp *arpinfo) | |
81 | { | |
82 | char *arpptr = (char *)(arphdr + 1); | |
83 | char *src_devaddr, *tgt_devaddr; | |
59b8bfd8 | 84 | __be32 src_ipaddr, tgt_ipaddr; |
1da177e4 LT |
85 | int i, ret; |
86 | ||
e79ec50b | 87 | #define FWINV(bool, invflg) ((bool) ^ !!(arpinfo->invflags & (invflg))) |
1da177e4 LT |
88 | |
89 | if (FWINV((arphdr->ar_op & arpinfo->arpop_mask) != arpinfo->arpop, | |
90 | ARPT_INV_ARPOP)) { | |
91 | dprintf("ARP operation field mismatch.\n"); | |
92 | dprintf("ar_op: %04x info->arpop: %04x info->arpop_mask: %04x\n", | |
93 | arphdr->ar_op, arpinfo->arpop, arpinfo->arpop_mask); | |
94 | return 0; | |
95 | } | |
96 | ||
97 | if (FWINV((arphdr->ar_hrd & arpinfo->arhrd_mask) != arpinfo->arhrd, | |
98 | ARPT_INV_ARPHRD)) { | |
99 | dprintf("ARP hardware address format mismatch.\n"); | |
100 | dprintf("ar_hrd: %04x info->arhrd: %04x info->arhrd_mask: %04x\n", | |
101 | arphdr->ar_hrd, arpinfo->arhrd, arpinfo->arhrd_mask); | |
102 | return 0; | |
103 | } | |
104 | ||
105 | if (FWINV((arphdr->ar_pro & arpinfo->arpro_mask) != arpinfo->arpro, | |
106 | ARPT_INV_ARPPRO)) { | |
107 | dprintf("ARP protocol address format mismatch.\n"); | |
108 | dprintf("ar_pro: %04x info->arpro: %04x info->arpro_mask: %04x\n", | |
109 | arphdr->ar_pro, arpinfo->arpro, arpinfo->arpro_mask); | |
110 | return 0; | |
111 | } | |
112 | ||
113 | if (FWINV((arphdr->ar_hln & arpinfo->arhln_mask) != arpinfo->arhln, | |
114 | ARPT_INV_ARPHLN)) { | |
115 | dprintf("ARP hardware address length mismatch.\n"); | |
116 | dprintf("ar_hln: %02x info->arhln: %02x info->arhln_mask: %02x\n", | |
117 | arphdr->ar_hln, arpinfo->arhln, arpinfo->arhln_mask); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | src_devaddr = arpptr; | |
122 | arpptr += dev->addr_len; | |
123 | memcpy(&src_ipaddr, arpptr, sizeof(u32)); | |
124 | arpptr += sizeof(u32); | |
125 | tgt_devaddr = arpptr; | |
126 | arpptr += dev->addr_len; | |
127 | memcpy(&tgt_ipaddr, arpptr, sizeof(u32)); | |
128 | ||
129 | if (FWINV(arp_devaddr_compare(&arpinfo->src_devaddr, src_devaddr, dev->addr_len), | |
130 | ARPT_INV_SRCDEVADDR) || | |
131 | FWINV(arp_devaddr_compare(&arpinfo->tgt_devaddr, tgt_devaddr, dev->addr_len), | |
132 | ARPT_INV_TGTDEVADDR)) { | |
133 | dprintf("Source or target device address mismatch.\n"); | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | if (FWINV((src_ipaddr & arpinfo->smsk.s_addr) != arpinfo->src.s_addr, | |
139 | ARPT_INV_SRCIP) || | |
140 | FWINV(((tgt_ipaddr & arpinfo->tmsk.s_addr) != arpinfo->tgt.s_addr), | |
141 | ARPT_INV_TGTIP)) { | |
142 | dprintf("Source or target IP address mismatch.\n"); | |
143 | ||
144 | dprintf("SRC: %u.%u.%u.%u. Mask: %u.%u.%u.%u. Target: %u.%u.%u.%u.%s\n", | |
145 | NIPQUAD(src_ipaddr), | |
146 | NIPQUAD(arpinfo->smsk.s_addr), | |
147 | NIPQUAD(arpinfo->src.s_addr), | |
148 | arpinfo->invflags & ARPT_INV_SRCIP ? " (INV)" : ""); | |
149 | dprintf("TGT: %u.%u.%u.%u Mask: %u.%u.%u.%u Target: %u.%u.%u.%u.%s\n", | |
150 | NIPQUAD(tgt_ipaddr), | |
151 | NIPQUAD(arpinfo->tmsk.s_addr), | |
152 | NIPQUAD(arpinfo->tgt.s_addr), | |
153 | arpinfo->invflags & ARPT_INV_TGTIP ? " (INV)" : ""); | |
154 | return 0; | |
155 | } | |
156 | ||
157 | /* Look for ifname matches. */ | |
158 | for (i = 0, ret = 0; i < IFNAMSIZ; i++) { | |
159 | ret |= (indev[i] ^ arpinfo->iniface[i]) | |
160 | & arpinfo->iniface_mask[i]; | |
161 | } | |
162 | ||
163 | if (FWINV(ret != 0, ARPT_INV_VIA_IN)) { | |
164 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
165 | indev, arpinfo->iniface, | |
166 | arpinfo->invflags&ARPT_INV_VIA_IN ?" (INV)":""); | |
167 | return 0; | |
168 | } | |
169 | ||
49688c84 DM |
170 | for (i = 0, ret = 0; i < IFNAMSIZ; i++) { |
171 | ret |= (outdev[i] ^ arpinfo->outiface[i]) | |
172 | & arpinfo->outiface_mask[i]; | |
1da177e4 LT |
173 | } |
174 | ||
175 | if (FWINV(ret != 0, ARPT_INV_VIA_OUT)) { | |
176 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
177 | outdev, arpinfo->outiface, | |
178 | arpinfo->invflags&ARPT_INV_VIA_OUT ?" (INV)":""); | |
179 | return 0; | |
180 | } | |
181 | ||
182 | return 1; | |
e79ec50b | 183 | #undef FWINV |
1da177e4 LT |
184 | } |
185 | ||
186 | static inline int arp_checkentry(const struct arpt_arp *arp) | |
187 | { | |
188 | if (arp->flags & ~ARPT_F_MASK) { | |
189 | duprintf("Unknown flag bits set: %08X\n", | |
190 | arp->flags & ~ARPT_F_MASK); | |
191 | return 0; | |
192 | } | |
193 | if (arp->invflags & ~ARPT_INV_MASK) { | |
194 | duprintf("Unknown invflag bits set: %08X\n", | |
195 | arp->invflags & ~ARPT_INV_MASK); | |
196 | return 0; | |
197 | } | |
198 | ||
199 | return 1; | |
200 | } | |
201 | ||
3db05fea | 202 | static unsigned int arpt_error(struct sk_buff *skb, |
1da177e4 LT |
203 | const struct net_device *in, |
204 | const struct net_device *out, | |
2e4e6a17 | 205 | unsigned int hooknum, |
c4986734 | 206 | const struct xt_target *target, |
fe1cb108 | 207 | const void *targinfo) |
1da177e4 LT |
208 | { |
209 | if (net_ratelimit()) | |
210 | printk("arp_tables: error: '%s'\n", (char *)targinfo); | |
211 | ||
212 | return NF_DROP; | |
213 | } | |
214 | ||
215 | static inline struct arpt_entry *get_entry(void *base, unsigned int offset) | |
216 | { | |
217 | return (struct arpt_entry *)(base + offset); | |
218 | } | |
219 | ||
3db05fea | 220 | unsigned int arpt_do_table(struct sk_buff *skb, |
1da177e4 LT |
221 | unsigned int hook, |
222 | const struct net_device *in, | |
223 | const struct net_device *out, | |
fe1cb108 | 224 | struct arpt_table *table) |
1da177e4 LT |
225 | { |
226 | static const char nulldevname[IFNAMSIZ]; | |
227 | unsigned int verdict = NF_DROP; | |
228 | struct arphdr *arp; | |
cff533ac | 229 | bool hotdrop = false; |
1da177e4 LT |
230 | struct arpt_entry *e, *back; |
231 | const char *indev, *outdev; | |
232 | void *table_base; | |
e0b7cde9 | 233 | struct xt_table_info *private; |
1da177e4 LT |
234 | |
235 | /* ARP header, plus 2 device addresses, plus 2 IP addresses. */ | |
3db05fea HX |
236 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + |
237 | (2 * skb->dev->addr_len) + | |
238 | (2 * sizeof(u32))))) | |
1da177e4 LT |
239 | return NF_DROP; |
240 | ||
241 | indev = in ? in->name : nulldevname; | |
242 | outdev = out ? out->name : nulldevname; | |
243 | ||
244 | read_lock_bh(&table->lock); | |
e0b7cde9 | 245 | private = table->private; |
2e4e6a17 HW |
246 | table_base = (void *)private->entries[smp_processor_id()]; |
247 | e = get_entry(table_base, private->hook_entry[hook]); | |
248 | back = get_entry(table_base, private->underflow[hook]); | |
1da177e4 | 249 | |
3db05fea | 250 | arp = arp_hdr(skb); |
1da177e4 | 251 | do { |
3db05fea | 252 | if (arp_packet_match(arp, skb->dev, indev, outdev, &e->arp)) { |
1da177e4 LT |
253 | struct arpt_entry_target *t; |
254 | int hdr_len; | |
255 | ||
256 | hdr_len = sizeof(*arp) + (2 * sizeof(struct in_addr)) + | |
3db05fea | 257 | (2 * skb->dev->addr_len); |
1da177e4 LT |
258 | ADD_COUNTER(e->counters, hdr_len, 1); |
259 | ||
260 | t = arpt_get_target(e); | |
261 | ||
262 | /* Standard target? */ | |
263 | if (!t->u.kernel.target->target) { | |
264 | int v; | |
265 | ||
266 | v = ((struct arpt_standard_target *)t)->verdict; | |
267 | if (v < 0) { | |
268 | /* Pop from stack? */ | |
269 | if (v != ARPT_RETURN) { | |
270 | verdict = (unsigned)(-v) - 1; | |
271 | break; | |
272 | } | |
273 | e = back; | |
274 | back = get_entry(table_base, | |
275 | back->comefrom); | |
276 | continue; | |
277 | } | |
278 | if (table_base + v | |
279 | != (void *)e + e->next_offset) { | |
280 | /* Save old back ptr in next entry */ | |
281 | struct arpt_entry *next | |
282 | = (void *)e + e->next_offset; | |
283 | next->comefrom = | |
284 | (void *)back - table_base; | |
285 | ||
286 | /* set back pointer to next entry */ | |
287 | back = next; | |
288 | } | |
289 | ||
290 | e = get_entry(table_base, v); | |
291 | } else { | |
292 | /* Targets which reenter must return | |
293 | * abs. verdicts | |
294 | */ | |
3db05fea | 295 | verdict = t->u.kernel.target->target(skb, |
1da177e4 | 296 | in, out, |
2e4e6a17 | 297 | hook, |
1c524830 | 298 | t->u.kernel.target, |
fe1cb108 | 299 | t->data); |
1da177e4 LT |
300 | |
301 | /* Target might have changed stuff. */ | |
3db05fea | 302 | arp = arp_hdr(skb); |
1da177e4 LT |
303 | |
304 | if (verdict == ARPT_CONTINUE) | |
305 | e = (void *)e + e->next_offset; | |
306 | else | |
307 | /* Verdict */ | |
308 | break; | |
309 | } | |
310 | } else { | |
311 | e = (void *)e + e->next_offset; | |
312 | } | |
313 | } while (!hotdrop); | |
314 | read_unlock_bh(&table->lock); | |
315 | ||
316 | if (hotdrop) | |
317 | return NF_DROP; | |
318 | else | |
319 | return verdict; | |
320 | } | |
321 | ||
1da177e4 LT |
322 | /* All zeroes == unconditional rule. */ |
323 | static inline int unconditional(const struct arpt_arp *arp) | |
324 | { | |
325 | unsigned int i; | |
326 | ||
327 | for (i = 0; i < sizeof(*arp)/sizeof(__u32); i++) | |
328 | if (((__u32 *)arp)[i]) | |
329 | return 0; | |
330 | ||
331 | return 1; | |
332 | } | |
333 | ||
334 | /* Figures out from what hook each rule can be called: returns 0 if | |
335 | * there are loops. Puts hook bitmask in comefrom. | |
336 | */ | |
2e4e6a17 | 337 | static int mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 338 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
339 | { |
340 | unsigned int hook; | |
341 | ||
342 | /* No recursion; use packet counter to save back ptrs (reset | |
343 | * to 0 as we leave), and comefrom to save source hook bitmask. | |
344 | */ | |
345 | for (hook = 0; hook < NF_ARP_NUMHOOKS; hook++) { | |
346 | unsigned int pos = newinfo->hook_entry[hook]; | |
347 | struct arpt_entry *e | |
31836064 | 348 | = (struct arpt_entry *)(entry0 + pos); |
1da177e4 LT |
349 | |
350 | if (!(valid_hooks & (1 << hook))) | |
351 | continue; | |
352 | ||
353 | /* Set initial back pointer. */ | |
354 | e->counters.pcnt = pos; | |
355 | ||
356 | for (;;) { | |
357 | struct arpt_standard_target *t | |
358 | = (void *)arpt_get_target(e); | |
e1b4b9f3 | 359 | int visited = e->comefrom & (1 << hook); |
1da177e4 LT |
360 | |
361 | if (e->comefrom & (1 << NF_ARP_NUMHOOKS)) { | |
362 | printk("arptables: loop hook %u pos %u %08X.\n", | |
363 | hook, pos, e->comefrom); | |
364 | return 0; | |
365 | } | |
366 | e->comefrom | |
367 | |= ((1 << hook) | (1 << NF_ARP_NUMHOOKS)); | |
368 | ||
369 | /* Unconditional return/END. */ | |
e1b4b9f3 | 370 | if ((e->target_offset == sizeof(struct arpt_entry) |
1da177e4 LT |
371 | && (strcmp(t->target.u.user.name, |
372 | ARPT_STANDARD_TARGET) == 0) | |
373 | && t->verdict < 0 | |
e1b4b9f3 | 374 | && unconditional(&e->arp)) || visited) { |
1da177e4 LT |
375 | unsigned int oldpos, size; |
376 | ||
74c9c0c1 DM |
377 | if (t->verdict < -NF_MAX_VERDICT - 1) { |
378 | duprintf("mark_source_chains: bad " | |
379 | "negative verdict (%i)\n", | |
380 | t->verdict); | |
381 | return 0; | |
382 | } | |
383 | ||
1da177e4 LT |
384 | /* Return: backtrack through the last |
385 | * big jump. | |
386 | */ | |
387 | do { | |
388 | e->comefrom ^= (1<<NF_ARP_NUMHOOKS); | |
389 | oldpos = pos; | |
390 | pos = e->counters.pcnt; | |
391 | e->counters.pcnt = 0; | |
392 | ||
393 | /* We're at the start. */ | |
394 | if (pos == oldpos) | |
395 | goto next; | |
396 | ||
397 | e = (struct arpt_entry *) | |
31836064 | 398 | (entry0 + pos); |
1da177e4 LT |
399 | } while (oldpos == pos + e->next_offset); |
400 | ||
401 | /* Move along one */ | |
402 | size = e->next_offset; | |
403 | e = (struct arpt_entry *) | |
31836064 | 404 | (entry0 + pos + size); |
1da177e4 LT |
405 | e->counters.pcnt = pos; |
406 | pos += size; | |
407 | } else { | |
408 | int newpos = t->verdict; | |
409 | ||
410 | if (strcmp(t->target.u.user.name, | |
411 | ARPT_STANDARD_TARGET) == 0 | |
412 | && newpos >= 0) { | |
74c9c0c1 DM |
413 | if (newpos > newinfo->size - |
414 | sizeof(struct arpt_entry)) { | |
415 | duprintf("mark_source_chains: " | |
416 | "bad verdict (%i)\n", | |
417 | newpos); | |
418 | return 0; | |
419 | } | |
420 | ||
1da177e4 LT |
421 | /* This a jump; chase it. */ |
422 | duprintf("Jump rule %u -> %u\n", | |
423 | pos, newpos); | |
424 | } else { | |
425 | /* ... this is a fallthru */ | |
426 | newpos = pos + e->next_offset; | |
427 | } | |
428 | e = (struct arpt_entry *) | |
31836064 | 429 | (entry0 + newpos); |
1da177e4 LT |
430 | e->counters.pcnt = pos; |
431 | pos = newpos; | |
432 | } | |
433 | } | |
434 | next: | |
435 | duprintf("Finished chain %u\n", hook); | |
436 | } | |
437 | return 1; | |
438 | } | |
439 | ||
fb5b6095 | 440 | static inline int check_entry(struct arpt_entry *e, const char *name) |
1da177e4 LT |
441 | { |
442 | struct arpt_entry_target *t; | |
1da177e4 LT |
443 | |
444 | if (!arp_checkentry(&e->arp)) { | |
445 | duprintf("arp_tables: arp check failed %p %s.\n", e, name); | |
446 | return -EINVAL; | |
447 | } | |
448 | ||
590bdf7f DM |
449 | if (e->target_offset + sizeof(struct arpt_entry_target) > e->next_offset) |
450 | return -EINVAL; | |
451 | ||
1da177e4 | 452 | t = arpt_get_target(e); |
590bdf7f DM |
453 | if (e->target_offset + t->u.target_size > e->next_offset) |
454 | return -EINVAL; | |
455 | ||
fb5b6095 PM |
456 | return 0; |
457 | } | |
458 | ||
459 | static inline int check_target(struct arpt_entry *e, const char *name) | |
460 | { | |
461 | struct arpt_entry_target *t; | |
462 | struct arpt_target *target; | |
463 | int ret; | |
464 | ||
465 | t = arpt_get_target(e); | |
466 | target = t->u.kernel.target; | |
467 | ||
468 | ret = xt_check_target(target, NF_ARP, t->u.target_size - sizeof(*t), | |
469 | name, e->comefrom, 0, 0); | |
470 | if (!ret && t->u.kernel.target->checkentry | |
471 | && !t->u.kernel.target->checkentry(name, e, target, t->data, | |
472 | e->comefrom)) { | |
473 | duprintf("arp_tables: check failed for `%s'.\n", | |
474 | t->u.kernel.target->name); | |
475 | ret = -EINVAL; | |
476 | } | |
477 | return ret; | |
478 | } | |
479 | ||
480 | static inline int | |
481 | find_check_entry(struct arpt_entry *e, const char *name, unsigned int size, | |
482 | unsigned int *i) | |
483 | { | |
484 | struct arpt_entry_target *t; | |
485 | struct arpt_target *target; | |
486 | int ret; | |
487 | ||
488 | ret = check_entry(e, name); | |
489 | if (ret) | |
490 | return ret; | |
491 | ||
492 | t = arpt_get_target(e); | |
2e4e6a17 HW |
493 | target = try_then_request_module(xt_find_target(NF_ARP, t->u.user.name, |
494 | t->u.user.revision), | |
6b7d31fc HW |
495 | "arpt_%s", t->u.user.name); |
496 | if (IS_ERR(target) || !target) { | |
fb5b6095 | 497 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
6b7d31fc | 498 | ret = target ? PTR_ERR(target) : -ENOENT; |
1da177e4 LT |
499 | goto out; |
500 | } | |
1da177e4 | 501 | t->u.kernel.target = target; |
1da177e4 | 502 | |
fb5b6095 | 503 | ret = check_target(e, name); |
3cdc7c95 PM |
504 | if (ret) |
505 | goto err; | |
506 | ||
1da177e4 LT |
507 | (*i)++; |
508 | return 0; | |
3cdc7c95 PM |
509 | err: |
510 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
511 | out: |
512 | return ret; | |
513 | } | |
514 | ||
515 | static inline int check_entry_size_and_hooks(struct arpt_entry *e, | |
2e4e6a17 | 516 | struct xt_table_info *newinfo, |
1da177e4 LT |
517 | unsigned char *base, |
518 | unsigned char *limit, | |
519 | const unsigned int *hook_entries, | |
520 | const unsigned int *underflows, | |
521 | unsigned int *i) | |
522 | { | |
523 | unsigned int h; | |
524 | ||
525 | if ((unsigned long)e % __alignof__(struct arpt_entry) != 0 | |
526 | || (unsigned char *)e + sizeof(struct arpt_entry) >= limit) { | |
527 | duprintf("Bad offset %p\n", e); | |
528 | return -EINVAL; | |
529 | } | |
530 | ||
531 | if (e->next_offset | |
532 | < sizeof(struct arpt_entry) + sizeof(struct arpt_entry_target)) { | |
533 | duprintf("checking: element %p size %u\n", | |
534 | e, e->next_offset); | |
535 | return -EINVAL; | |
536 | } | |
537 | ||
538 | /* Check hooks & underflows */ | |
539 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { | |
540 | if ((unsigned char *)e - base == hook_entries[h]) | |
541 | newinfo->hook_entry[h] = hook_entries[h]; | |
542 | if ((unsigned char *)e - base == underflows[h]) | |
543 | newinfo->underflow[h] = underflows[h]; | |
544 | } | |
545 | ||
546 | /* FIXME: underflows must be unconditional, standard verdicts | |
e905a9ed | 547 | < 0 (not ARPT_RETURN). --RR */ |
1da177e4 LT |
548 | |
549 | /* Clear counters and comefrom */ | |
2e4e6a17 | 550 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
551 | e->comefrom = 0; |
552 | ||
553 | (*i)++; | |
554 | return 0; | |
555 | } | |
556 | ||
557 | static inline int cleanup_entry(struct arpt_entry *e, unsigned int *i) | |
558 | { | |
559 | struct arpt_entry_target *t; | |
560 | ||
561 | if (i && (*i)-- == 0) | |
562 | return 1; | |
563 | ||
564 | t = arpt_get_target(e); | |
565 | if (t->u.kernel.target->destroy) | |
efa74165 | 566 | t->u.kernel.target->destroy(t->u.kernel.target, t->data); |
1da177e4 LT |
567 | module_put(t->u.kernel.target->me); |
568 | return 0; | |
569 | } | |
570 | ||
571 | /* Checks and translates the user-supplied table segment (held in | |
572 | * newinfo). | |
573 | */ | |
574 | static int translate_table(const char *name, | |
575 | unsigned int valid_hooks, | |
2e4e6a17 | 576 | struct xt_table_info *newinfo, |
31836064 | 577 | void *entry0, |
1da177e4 LT |
578 | unsigned int size, |
579 | unsigned int number, | |
580 | const unsigned int *hook_entries, | |
581 | const unsigned int *underflows) | |
582 | { | |
583 | unsigned int i; | |
584 | int ret; | |
585 | ||
586 | newinfo->size = size; | |
587 | newinfo->number = number; | |
588 | ||
589 | /* Init all hooks to impossible value. */ | |
590 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
591 | newinfo->hook_entry[i] = 0xFFFFFFFF; | |
592 | newinfo->underflow[i] = 0xFFFFFFFF; | |
593 | } | |
594 | ||
595 | duprintf("translate_table: size %u\n", newinfo->size); | |
596 | i = 0; | |
597 | ||
598 | /* Walk through entries, checking offsets. */ | |
31836064 | 599 | ret = ARPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
600 | check_entry_size_and_hooks, |
601 | newinfo, | |
31836064 ED |
602 | entry0, |
603 | entry0 + size, | |
1da177e4 LT |
604 | hook_entries, underflows, &i); |
605 | duprintf("translate_table: ARPT_ENTRY_ITERATE gives %d\n", ret); | |
606 | if (ret != 0) | |
607 | return ret; | |
608 | ||
609 | if (i != number) { | |
610 | duprintf("translate_table: %u not %u entries\n", | |
611 | i, number); | |
612 | return -EINVAL; | |
613 | } | |
614 | ||
615 | /* Check hooks all assigned */ | |
616 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
617 | /* Only hooks which are valid */ | |
618 | if (!(valid_hooks & (1 << i))) | |
619 | continue; | |
620 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
621 | duprintf("Invalid hook entry %u %u\n", | |
622 | i, hook_entries[i]); | |
623 | return -EINVAL; | |
624 | } | |
625 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
626 | duprintf("Invalid underflow %u %u\n", | |
627 | i, underflows[i]); | |
628 | return -EINVAL; | |
629 | } | |
630 | } | |
631 | ||
74c9c0c1 DM |
632 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) { |
633 | duprintf("Looping hook\n"); | |
634 | return -ELOOP; | |
635 | } | |
636 | ||
1da177e4 LT |
637 | /* Finally, each sanity check must pass */ |
638 | i = 0; | |
31836064 | 639 | ret = ARPT_ENTRY_ITERATE(entry0, newinfo->size, |
fb5b6095 | 640 | find_check_entry, name, size, &i); |
1da177e4 | 641 | |
74c9c0c1 DM |
642 | if (ret != 0) { |
643 | ARPT_ENTRY_ITERATE(entry0, newinfo->size, | |
644 | cleanup_entry, &i); | |
645 | return ret; | |
1da177e4 LT |
646 | } |
647 | ||
648 | /* And one copy for every other CPU */ | |
6f912042 | 649 | for_each_possible_cpu(i) { |
31836064 ED |
650 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
651 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
652 | } |
653 | ||
654 | return ret; | |
655 | } | |
656 | ||
1da177e4 LT |
657 | /* Gets counters. */ |
658 | static inline int add_entry_to_counter(const struct arpt_entry *e, | |
2e4e6a17 | 659 | struct xt_counters total[], |
1da177e4 LT |
660 | unsigned int *i) |
661 | { | |
662 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
663 | ||
664 | (*i)++; | |
665 | return 0; | |
666 | } | |
667 | ||
31836064 | 668 | static inline int set_entry_to_counter(const struct arpt_entry *e, |
2e4e6a17 | 669 | struct xt_counters total[], |
31836064 ED |
670 | unsigned int *i) |
671 | { | |
672 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
673 | ||
674 | (*i)++; | |
675 | return 0; | |
676 | } | |
677 | ||
2e4e6a17 HW |
678 | static void get_counters(const struct xt_table_info *t, |
679 | struct xt_counters counters[]) | |
1da177e4 LT |
680 | { |
681 | unsigned int cpu; | |
682 | unsigned int i; | |
31836064 ED |
683 | unsigned int curcpu; |
684 | ||
685 | /* Instead of clearing (by a previous call to memset()) | |
686 | * the counters and using adds, we set the counters | |
687 | * with data used by 'current' CPU | |
688 | * We dont care about preemption here. | |
689 | */ | |
690 | curcpu = raw_smp_processor_id(); | |
691 | ||
692 | i = 0; | |
693 | ARPT_ENTRY_ITERATE(t->entries[curcpu], | |
694 | t->size, | |
695 | set_entry_to_counter, | |
696 | counters, | |
697 | &i); | |
1da177e4 | 698 | |
6f912042 | 699 | for_each_possible_cpu(cpu) { |
31836064 ED |
700 | if (cpu == curcpu) |
701 | continue; | |
1da177e4 | 702 | i = 0; |
31836064 | 703 | ARPT_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
704 | t->size, |
705 | add_entry_to_counter, | |
706 | counters, | |
707 | &i); | |
708 | } | |
709 | } | |
710 | ||
27e2c26b | 711 | static inline struct xt_counters *alloc_counters(struct arpt_table *table) |
1da177e4 | 712 | { |
27e2c26b | 713 | unsigned int countersize; |
2e4e6a17 HW |
714 | struct xt_counters *counters; |
715 | struct xt_table_info *private = table->private; | |
1da177e4 LT |
716 | |
717 | /* We need atomic snapshot of counters: rest doesn't change | |
718 | * (other than comefrom, which userspace doesn't care | |
719 | * about). | |
720 | */ | |
2e4e6a17 HW |
721 | countersize = sizeof(struct xt_counters) * private->number; |
722 | counters = vmalloc_node(countersize, numa_node_id()); | |
1da177e4 LT |
723 | |
724 | if (counters == NULL) | |
27e2c26b | 725 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
726 | |
727 | /* First, sum counters... */ | |
1da177e4 | 728 | write_lock_bh(&table->lock); |
2e4e6a17 | 729 | get_counters(private, counters); |
1da177e4 LT |
730 | write_unlock_bh(&table->lock); |
731 | ||
27e2c26b PM |
732 | return counters; |
733 | } | |
734 | ||
735 | static int copy_entries_to_user(unsigned int total_size, | |
736 | struct arpt_table *table, | |
737 | void __user *userptr) | |
738 | { | |
739 | unsigned int off, num; | |
740 | struct arpt_entry *e; | |
741 | struct xt_counters *counters; | |
742 | struct xt_table_info *private = table->private; | |
743 | int ret = 0; | |
744 | void *loc_cpu_entry; | |
745 | ||
746 | counters = alloc_counters(table); | |
747 | if (IS_ERR(counters)) | |
748 | return PTR_ERR(counters); | |
749 | ||
2e4e6a17 | 750 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 ED |
751 | /* ... then copy entire thing ... */ |
752 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { | |
1da177e4 LT |
753 | ret = -EFAULT; |
754 | goto free_counters; | |
755 | } | |
756 | ||
757 | /* FIXME: use iterator macros --RR */ | |
758 | /* ... then go back and fix counters and names */ | |
759 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
760 | struct arpt_entry_target *t; | |
761 | ||
31836064 | 762 | e = (struct arpt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
763 | if (copy_to_user(userptr + off |
764 | + offsetof(struct arpt_entry, counters), | |
765 | &counters[num], | |
766 | sizeof(counters[num])) != 0) { | |
767 | ret = -EFAULT; | |
768 | goto free_counters; | |
769 | } | |
770 | ||
771 | t = arpt_get_target(e); | |
772 | if (copy_to_user(userptr + off + e->target_offset | |
773 | + offsetof(struct arpt_entry_target, | |
774 | u.user.name), | |
775 | t->u.kernel.target->name, | |
776 | strlen(t->u.kernel.target->name)+1) != 0) { | |
777 | ret = -EFAULT; | |
778 | goto free_counters; | |
779 | } | |
780 | } | |
781 | ||
782 | free_counters: | |
783 | vfree(counters); | |
784 | return ret; | |
785 | } | |
786 | ||
d6a2ba07 PM |
787 | #ifdef CONFIG_COMPAT |
788 | static void compat_standard_from_user(void *dst, void *src) | |
789 | { | |
790 | int v = *(compat_int_t *)src; | |
791 | ||
792 | if (v > 0) | |
793 | v += xt_compat_calc_jump(NF_ARP, v); | |
794 | memcpy(dst, &v, sizeof(v)); | |
795 | } | |
796 | ||
797 | static int compat_standard_to_user(void __user *dst, void *src) | |
798 | { | |
799 | compat_int_t cv = *(int *)src; | |
800 | ||
801 | if (cv > 0) | |
802 | cv -= xt_compat_calc_jump(NF_ARP, cv); | |
803 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; | |
804 | } | |
805 | ||
806 | static int compat_calc_entry(struct arpt_entry *e, | |
807 | const struct xt_table_info *info, | |
808 | void *base, struct xt_table_info *newinfo) | |
809 | { | |
810 | struct arpt_entry_target *t; | |
811 | unsigned int entry_offset; | |
812 | int off, i, ret; | |
813 | ||
814 | off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
815 | entry_offset = (void *)e - base; | |
816 | ||
817 | t = arpt_get_target(e); | |
818 | off += xt_compat_target_offset(t->u.kernel.target); | |
819 | newinfo->size -= off; | |
820 | ret = xt_compat_add_offset(NF_ARP, entry_offset, off); | |
821 | if (ret) | |
822 | return ret; | |
823 | ||
824 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
825 | if (info->hook_entry[i] && | |
826 | (e < (struct arpt_entry *)(base + info->hook_entry[i]))) | |
827 | newinfo->hook_entry[i] -= off; | |
828 | if (info->underflow[i] && | |
829 | (e < (struct arpt_entry *)(base + info->underflow[i]))) | |
830 | newinfo->underflow[i] -= off; | |
831 | } | |
832 | return 0; | |
833 | } | |
834 | ||
835 | static int compat_table_info(const struct xt_table_info *info, | |
836 | struct xt_table_info *newinfo) | |
837 | { | |
838 | void *loc_cpu_entry; | |
839 | ||
840 | if (!newinfo || !info) | |
841 | return -EINVAL; | |
842 | ||
843 | /* we dont care about newinfo->entries[] */ | |
844 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
845 | newinfo->initial_entries = 0; | |
846 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
847 | return ARPT_ENTRY_ITERATE(loc_cpu_entry, info->size, | |
848 | compat_calc_entry, info, loc_cpu_entry, | |
849 | newinfo); | |
850 | } | |
851 | #endif | |
852 | ||
853 | static int get_info(void __user *user, int *len, int compat) | |
41acd975 PM |
854 | { |
855 | char name[ARPT_TABLE_MAXNAMELEN]; | |
856 | struct arpt_table *t; | |
857 | int ret; | |
858 | ||
859 | if (*len != sizeof(struct arpt_getinfo)) { | |
860 | duprintf("length %u != %Zu\n", *len, | |
861 | sizeof(struct arpt_getinfo)); | |
862 | return -EINVAL; | |
863 | } | |
864 | ||
865 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
866 | return -EFAULT; | |
867 | ||
868 | name[ARPT_TABLE_MAXNAMELEN-1] = '\0'; | |
d6a2ba07 PM |
869 | #ifdef CONFIG_COMPAT |
870 | if (compat) | |
871 | xt_compat_lock(NF_ARP); | |
872 | #endif | |
8d870052 | 873 | t = try_then_request_module(xt_find_table_lock(&init_net, NF_ARP, name), |
41acd975 PM |
874 | "arptable_%s", name); |
875 | if (t && !IS_ERR(t)) { | |
876 | struct arpt_getinfo info; | |
877 | struct xt_table_info *private = t->private; | |
878 | ||
d6a2ba07 PM |
879 | #ifdef CONFIG_COMPAT |
880 | if (compat) { | |
881 | struct xt_table_info tmp; | |
882 | ret = compat_table_info(private, &tmp); | |
883 | xt_compat_flush_offsets(NF_ARP); | |
884 | private = &tmp; | |
885 | } | |
886 | #endif | |
41acd975 PM |
887 | info.valid_hooks = t->valid_hooks; |
888 | memcpy(info.hook_entry, private->hook_entry, | |
889 | sizeof(info.hook_entry)); | |
890 | memcpy(info.underflow, private->underflow, | |
891 | sizeof(info.underflow)); | |
892 | info.num_entries = private->number; | |
893 | info.size = private->size; | |
894 | strcpy(info.name, name); | |
895 | ||
896 | if (copy_to_user(user, &info, *len) != 0) | |
897 | ret = -EFAULT; | |
898 | else | |
899 | ret = 0; | |
900 | xt_table_unlock(t); | |
901 | module_put(t->me); | |
902 | } else | |
903 | ret = t ? PTR_ERR(t) : -ENOENT; | |
d6a2ba07 PM |
904 | #ifdef CONFIG_COMPAT |
905 | if (compat) | |
906 | xt_compat_unlock(NF_ARP); | |
907 | #endif | |
41acd975 PM |
908 | return ret; |
909 | } | |
910 | ||
11f6dff8 | 911 | static int get_entries(struct arpt_get_entries __user *uptr, int *len) |
1da177e4 LT |
912 | { |
913 | int ret; | |
11f6dff8 | 914 | struct arpt_get_entries get; |
1da177e4 LT |
915 | struct arpt_table *t; |
916 | ||
11f6dff8 PM |
917 | if (*len < sizeof(get)) { |
918 | duprintf("get_entries: %u < %Zu\n", *len, sizeof(get)); | |
919 | return -EINVAL; | |
920 | } | |
921 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
922 | return -EFAULT; | |
923 | if (*len != sizeof(struct arpt_get_entries) + get.size) { | |
924 | duprintf("get_entries: %u != %Zu\n", *len, | |
925 | sizeof(struct arpt_get_entries) + get.size); | |
926 | return -EINVAL; | |
927 | } | |
928 | ||
8d870052 | 929 | t = xt_find_table_lock(&init_net, NF_ARP, get.name); |
31fe4d33 | 930 | if (t && !IS_ERR(t)) { |
2e4e6a17 | 931 | struct xt_table_info *private = t->private; |
1da177e4 | 932 | duprintf("t->private->number = %u\n", |
2e4e6a17 | 933 | private->number); |
11f6dff8 | 934 | if (get.size == private->size) |
2e4e6a17 | 935 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
936 | t, uptr->entrytable); |
937 | else { | |
938 | duprintf("get_entries: I've got %u not %u!\n", | |
11f6dff8 | 939 | private->size, get.size); |
1da177e4 LT |
940 | ret = -EINVAL; |
941 | } | |
6b7d31fc | 942 | module_put(t->me); |
2e4e6a17 | 943 | xt_table_unlock(t); |
1da177e4 | 944 | } else |
6b7d31fc | 945 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
946 | |
947 | return ret; | |
948 | } | |
949 | ||
d6a2ba07 PM |
950 | static int __do_replace(const char *name, unsigned int valid_hooks, |
951 | struct xt_table_info *newinfo, | |
952 | unsigned int num_counters, | |
953 | void __user *counters_ptr) | |
1da177e4 LT |
954 | { |
955 | int ret; | |
1da177e4 | 956 | struct arpt_table *t; |
d6a2ba07 | 957 | struct xt_table_info *oldinfo; |
2e4e6a17 | 958 | struct xt_counters *counters; |
d6a2ba07 | 959 | void *loc_cpu_old_entry; |
1da177e4 | 960 | |
d6a2ba07 PM |
961 | ret = 0; |
962 | counters = vmalloc_node(num_counters * sizeof(struct xt_counters), | |
19763120 | 963 | numa_node_id()); |
1da177e4 LT |
964 | if (!counters) { |
965 | ret = -ENOMEM; | |
d6a2ba07 | 966 | goto out; |
1da177e4 | 967 | } |
1da177e4 | 968 | |
8d870052 | 969 | t = try_then_request_module(xt_find_table_lock(&init_net, NF_ARP, name), |
d6a2ba07 | 970 | "arptable_%s", name); |
6b7d31fc HW |
971 | if (!t || IS_ERR(t)) { |
972 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 973 | goto free_newinfo_counters_untrans; |
6b7d31fc | 974 | } |
1da177e4 LT |
975 | |
976 | /* You lied! */ | |
d6a2ba07 | 977 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 978 | duprintf("Valid hook crap: %08X vs %08X\n", |
d6a2ba07 | 979 | valid_hooks, t->valid_hooks); |
1da177e4 | 980 | ret = -EINVAL; |
6b7d31fc | 981 | goto put_module; |
1da177e4 LT |
982 | } |
983 | ||
d6a2ba07 | 984 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
985 | if (!oldinfo) |
986 | goto put_module; | |
987 | ||
988 | /* Update module usage count based on number of rules */ | |
989 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
990 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
e905a9ed YH |
991 | if ((oldinfo->number > oldinfo->initial_entries) || |
992 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
993 | module_put(t->me); |
994 | if ((oldinfo->number > oldinfo->initial_entries) && | |
995 | (newinfo->number <= oldinfo->initial_entries)) | |
996 | module_put(t->me); | |
997 | ||
998 | /* Get the old counters. */ | |
999 | get_counters(oldinfo, counters); | |
1000 | /* Decrease module usage counts and free resource */ | |
31836064 | 1001 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
d6a2ba07 PM |
1002 | ARPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry, |
1003 | NULL); | |
31836064 | 1004 | |
2e4e6a17 | 1005 | xt_free_table_info(oldinfo); |
d6a2ba07 PM |
1006 | if (copy_to_user(counters_ptr, counters, |
1007 | sizeof(struct xt_counters) * num_counters) != 0) | |
1da177e4 LT |
1008 | ret = -EFAULT; |
1009 | vfree(counters); | |
2e4e6a17 | 1010 | xt_table_unlock(t); |
1da177e4 LT |
1011 | return ret; |
1012 | ||
1013 | put_module: | |
1014 | module_put(t->me); | |
2e4e6a17 | 1015 | xt_table_unlock(t); |
1da177e4 | 1016 | free_newinfo_counters_untrans: |
1da177e4 | 1017 | vfree(counters); |
d6a2ba07 PM |
1018 | out: |
1019 | return ret; | |
1020 | } | |
1021 | ||
1022 | static int do_replace(void __user *user, unsigned int len) | |
1023 | { | |
1024 | int ret; | |
1025 | struct arpt_replace tmp; | |
1026 | struct xt_table_info *newinfo; | |
1027 | void *loc_cpu_entry; | |
1028 | ||
1029 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1030 | return -EFAULT; | |
1031 | ||
1032 | /* overflow check */ | |
1033 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1034 | return -ENOMEM; | |
1035 | ||
1036 | newinfo = xt_alloc_table_info(tmp.size); | |
1037 | if (!newinfo) | |
1038 | return -ENOMEM; | |
1039 | ||
1040 | /* choose the copy that is on our node/cpu */ | |
1041 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1042 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1043 | tmp.size) != 0) { | |
1044 | ret = -EFAULT; | |
1045 | goto free_newinfo; | |
1046 | } | |
1047 | ||
1048 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
1049 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, | |
1050 | tmp.hook_entry, tmp.underflow); | |
1051 | if (ret != 0) | |
1052 | goto free_newinfo; | |
1053 | ||
1054 | duprintf("arp_tables: Translated table\n"); | |
1055 | ||
1056 | ret = __do_replace(tmp.name, tmp.valid_hooks, newinfo, | |
1057 | tmp.num_counters, tmp.counters); | |
1058 | if (ret) | |
1059 | goto free_newinfo_untrans; | |
1060 | return 0; | |
1061 | ||
1062 | free_newinfo_untrans: | |
1063 | ARPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); | |
1da177e4 | 1064 | free_newinfo: |
2e4e6a17 | 1065 | xt_free_table_info(newinfo); |
1da177e4 LT |
1066 | return ret; |
1067 | } | |
1068 | ||
1069 | /* We're lazy, and add to the first CPU; overflow works its fey magic | |
1070 | * and everything is OK. | |
1071 | */ | |
1072 | static inline int add_counter_to_entry(struct arpt_entry *e, | |
2e4e6a17 | 1073 | const struct xt_counters addme[], |
1da177e4 LT |
1074 | unsigned int *i) |
1075 | { | |
1076 | ||
1077 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1078 | ||
1079 | (*i)++; | |
1080 | return 0; | |
1081 | } | |
1082 | ||
d6a2ba07 | 1083 | static int do_add_counters(void __user *user, unsigned int len, int compat) |
1da177e4 LT |
1084 | { |
1085 | unsigned int i; | |
d6a2ba07 PM |
1086 | struct xt_counters_info tmp; |
1087 | struct xt_counters *paddc; | |
1088 | unsigned int num_counters; | |
1089 | char *name; | |
1090 | int size; | |
1091 | void *ptmp; | |
1da177e4 | 1092 | struct arpt_table *t; |
2e4e6a17 | 1093 | struct xt_table_info *private; |
6b7d31fc | 1094 | int ret = 0; |
31836064 | 1095 | void *loc_cpu_entry; |
d6a2ba07 PM |
1096 | #ifdef CONFIG_COMPAT |
1097 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1098 | |
d6a2ba07 PM |
1099 | if (compat) { |
1100 | ptmp = &compat_tmp; | |
1101 | size = sizeof(struct compat_xt_counters_info); | |
1102 | } else | |
1103 | #endif | |
1104 | { | |
1105 | ptmp = &tmp; | |
1106 | size = sizeof(struct xt_counters_info); | |
1107 | } | |
1108 | ||
1109 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1110 | return -EFAULT; |
1111 | ||
d6a2ba07 PM |
1112 | #ifdef CONFIG_COMPAT |
1113 | if (compat) { | |
1114 | num_counters = compat_tmp.num_counters; | |
1115 | name = compat_tmp.name; | |
1116 | } else | |
1117 | #endif | |
1118 | { | |
1119 | num_counters = tmp.num_counters; | |
1120 | name = tmp.name; | |
1121 | } | |
1122 | ||
1123 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1124 | return -EINVAL; |
1125 | ||
d6a2ba07 | 1126 | paddc = vmalloc_node(len - size, numa_node_id()); |
1da177e4 LT |
1127 | if (!paddc) |
1128 | return -ENOMEM; | |
1129 | ||
d6a2ba07 | 1130 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1131 | ret = -EFAULT; |
1132 | goto free; | |
1133 | } | |
1134 | ||
8d870052 | 1135 | t = xt_find_table_lock(&init_net, NF_ARP, name); |
6b7d31fc HW |
1136 | if (!t || IS_ERR(t)) { |
1137 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1138 | goto free; |
6b7d31fc | 1139 | } |
1da177e4 LT |
1140 | |
1141 | write_lock_bh(&t->lock); | |
2e4e6a17 | 1142 | private = t->private; |
d6a2ba07 | 1143 | if (private->number != num_counters) { |
1da177e4 LT |
1144 | ret = -EINVAL; |
1145 | goto unlock_up_free; | |
1146 | } | |
1147 | ||
1148 | i = 0; | |
31836064 | 1149 | /* Choose the copy that is on our node */ |
2e4e6a17 | 1150 | loc_cpu_entry = private->entries[smp_processor_id()]; |
31836064 | 1151 | ARPT_ENTRY_ITERATE(loc_cpu_entry, |
2e4e6a17 | 1152 | private->size, |
1da177e4 | 1153 | add_counter_to_entry, |
d6a2ba07 | 1154 | paddc, |
1da177e4 LT |
1155 | &i); |
1156 | unlock_up_free: | |
1157 | write_unlock_bh(&t->lock); | |
2e4e6a17 | 1158 | xt_table_unlock(t); |
6b7d31fc | 1159 | module_put(t->me); |
1da177e4 LT |
1160 | free: |
1161 | vfree(paddc); | |
1162 | ||
1163 | return ret; | |
1164 | } | |
1165 | ||
d6a2ba07 PM |
1166 | #ifdef CONFIG_COMPAT |
1167 | static inline int | |
1168 | compat_release_entry(struct compat_arpt_entry *e, unsigned int *i) | |
1169 | { | |
1170 | struct arpt_entry_target *t; | |
1171 | ||
1172 | if (i && (*i)-- == 0) | |
1173 | return 1; | |
1174 | ||
1175 | t = compat_arpt_get_target(e); | |
1176 | module_put(t->u.kernel.target->me); | |
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | static inline int | |
1181 | check_compat_entry_size_and_hooks(struct compat_arpt_entry *e, | |
1182 | struct xt_table_info *newinfo, | |
1183 | unsigned int *size, | |
1184 | unsigned char *base, | |
1185 | unsigned char *limit, | |
1186 | unsigned int *hook_entries, | |
1187 | unsigned int *underflows, | |
1188 | unsigned int *i, | |
1189 | const char *name) | |
1190 | { | |
1191 | struct arpt_entry_target *t; | |
1192 | struct xt_target *target; | |
1193 | unsigned int entry_offset; | |
1194 | int ret, off, h; | |
1195 | ||
1196 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
1197 | if ((unsigned long)e % __alignof__(struct compat_arpt_entry) != 0 | |
1198 | || (unsigned char *)e + sizeof(struct compat_arpt_entry) >= limit) { | |
1199 | duprintf("Bad offset %p, limit = %p\n", e, limit); | |
1200 | return -EINVAL; | |
1201 | } | |
1202 | ||
1203 | if (e->next_offset < sizeof(struct compat_arpt_entry) + | |
1204 | sizeof(struct compat_xt_entry_target)) { | |
1205 | duprintf("checking: element %p size %u\n", | |
1206 | e, e->next_offset); | |
1207 | return -EINVAL; | |
1208 | } | |
1209 | ||
1210 | /* For purposes of check_entry casting the compat entry is fine */ | |
1211 | ret = check_entry((struct arpt_entry *)e, name); | |
1212 | if (ret) | |
1213 | return ret; | |
1214 | ||
1215 | off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
1216 | entry_offset = (void *)e - (void *)base; | |
1217 | ||
1218 | t = compat_arpt_get_target(e); | |
1219 | target = try_then_request_module(xt_find_target(NF_ARP, | |
1220 | t->u.user.name, | |
1221 | t->u.user.revision), | |
1222 | "arpt_%s", t->u.user.name); | |
1223 | if (IS_ERR(target) || !target) { | |
1224 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", | |
1225 | t->u.user.name); | |
1226 | ret = target ? PTR_ERR(target) : -ENOENT; | |
1227 | goto out; | |
1228 | } | |
1229 | t->u.kernel.target = target; | |
1230 | ||
1231 | off += xt_compat_target_offset(target); | |
1232 | *size += off; | |
1233 | ret = xt_compat_add_offset(NF_ARP, entry_offset, off); | |
1234 | if (ret) | |
1235 | goto release_target; | |
1236 | ||
1237 | /* Check hooks & underflows */ | |
1238 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { | |
1239 | if ((unsigned char *)e - base == hook_entries[h]) | |
1240 | newinfo->hook_entry[h] = hook_entries[h]; | |
1241 | if ((unsigned char *)e - base == underflows[h]) | |
1242 | newinfo->underflow[h] = underflows[h]; | |
1243 | } | |
1244 | ||
1245 | /* Clear counters and comefrom */ | |
1246 | memset(&e->counters, 0, sizeof(e->counters)); | |
1247 | e->comefrom = 0; | |
1248 | ||
1249 | (*i)++; | |
1250 | return 0; | |
1251 | ||
1252 | release_target: | |
1253 | module_put(t->u.kernel.target->me); | |
1254 | out: | |
1255 | return ret; | |
1256 | } | |
1257 | ||
1258 | static int | |
1259 | compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr, | |
1260 | unsigned int *size, const char *name, | |
1261 | struct xt_table_info *newinfo, unsigned char *base) | |
1262 | { | |
1263 | struct arpt_entry_target *t; | |
1264 | struct xt_target *target; | |
1265 | struct arpt_entry *de; | |
1266 | unsigned int origsize; | |
1267 | int ret, h; | |
1268 | ||
1269 | ret = 0; | |
1270 | origsize = *size; | |
1271 | de = (struct arpt_entry *)*dstptr; | |
1272 | memcpy(de, e, sizeof(struct arpt_entry)); | |
1273 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1274 | ||
1275 | *dstptr += sizeof(struct arpt_entry); | |
1276 | *size += sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
1277 | ||
1278 | de->target_offset = e->target_offset - (origsize - *size); | |
1279 | t = compat_arpt_get_target(e); | |
1280 | target = t->u.kernel.target; | |
1281 | xt_compat_target_from_user(t, dstptr, size); | |
1282 | ||
1283 | de->next_offset = e->next_offset - (origsize - *size); | |
1284 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { | |
1285 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1286 | newinfo->hook_entry[h] -= origsize - *size; | |
1287 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1288 | newinfo->underflow[h] -= origsize - *size; | |
1289 | } | |
1290 | return ret; | |
1291 | } | |
1292 | ||
1293 | static inline int compat_check_entry(struct arpt_entry *e, const char *name, | |
1294 | unsigned int *i) | |
1295 | { | |
1296 | int ret; | |
1297 | ||
1298 | ret = check_target(e, name); | |
1299 | if (ret) | |
1300 | return ret; | |
1301 | ||
1302 | (*i)++; | |
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | static int translate_compat_table(const char *name, | |
1307 | unsigned int valid_hooks, | |
1308 | struct xt_table_info **pinfo, | |
1309 | void **pentry0, | |
1310 | unsigned int total_size, | |
1311 | unsigned int number, | |
1312 | unsigned int *hook_entries, | |
1313 | unsigned int *underflows) | |
1314 | { | |
1315 | unsigned int i, j; | |
1316 | struct xt_table_info *newinfo, *info; | |
1317 | void *pos, *entry0, *entry1; | |
1318 | unsigned int size; | |
1319 | int ret; | |
1320 | ||
1321 | info = *pinfo; | |
1322 | entry0 = *pentry0; | |
1323 | size = total_size; | |
1324 | info->number = number; | |
1325 | ||
1326 | /* Init all hooks to impossible value. */ | |
1327 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
1328 | info->hook_entry[i] = 0xFFFFFFFF; | |
1329 | info->underflow[i] = 0xFFFFFFFF; | |
1330 | } | |
1331 | ||
1332 | duprintf("translate_compat_table: size %u\n", info->size); | |
1333 | j = 0; | |
1334 | xt_compat_lock(NF_ARP); | |
1335 | /* Walk through entries, checking offsets. */ | |
1336 | ret = COMPAT_ARPT_ENTRY_ITERATE(entry0, total_size, | |
1337 | check_compat_entry_size_and_hooks, | |
1338 | info, &size, entry0, | |
1339 | entry0 + total_size, | |
1340 | hook_entries, underflows, &j, name); | |
1341 | if (ret != 0) | |
1342 | goto out_unlock; | |
1343 | ||
1344 | ret = -EINVAL; | |
1345 | if (j != number) { | |
1346 | duprintf("translate_compat_table: %u not %u entries\n", | |
1347 | j, number); | |
1348 | goto out_unlock; | |
1349 | } | |
1350 | ||
1351 | /* Check hooks all assigned */ | |
1352 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
1353 | /* Only hooks which are valid */ | |
1354 | if (!(valid_hooks & (1 << i))) | |
1355 | continue; | |
1356 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1357 | duprintf("Invalid hook entry %u %u\n", | |
1358 | i, hook_entries[i]); | |
1359 | goto out_unlock; | |
1360 | } | |
1361 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1362 | duprintf("Invalid underflow %u %u\n", | |
1363 | i, underflows[i]); | |
1364 | goto out_unlock; | |
1365 | } | |
1366 | } | |
1367 | ||
1368 | ret = -ENOMEM; | |
1369 | newinfo = xt_alloc_table_info(size); | |
1370 | if (!newinfo) | |
1371 | goto out_unlock; | |
1372 | ||
1373 | newinfo->number = number; | |
1374 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
1375 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1376 | newinfo->underflow[i] = info->underflow[i]; | |
1377 | } | |
1378 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1379 | pos = entry1; | |
1380 | size = total_size; | |
1381 | ret = COMPAT_ARPT_ENTRY_ITERATE(entry0, total_size, | |
1382 | compat_copy_entry_from_user, | |
1383 | &pos, &size, name, newinfo, entry1); | |
1384 | xt_compat_flush_offsets(NF_ARP); | |
1385 | xt_compat_unlock(NF_ARP); | |
1386 | if (ret) | |
1387 | goto free_newinfo; | |
1388 | ||
1389 | ret = -ELOOP; | |
1390 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1391 | goto free_newinfo; | |
1392 | ||
1393 | i = 0; | |
1394 | ret = ARPT_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry, | |
1395 | name, &i); | |
1396 | if (ret) { | |
1397 | j -= i; | |
1398 | COMPAT_ARPT_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i, | |
1399 | compat_release_entry, &j); | |
1400 | ARPT_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i); | |
1401 | xt_free_table_info(newinfo); | |
1402 | return ret; | |
1403 | } | |
1404 | ||
1405 | /* And one copy for every other CPU */ | |
1406 | for_each_possible_cpu(i) | |
1407 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1408 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1409 | ||
1410 | *pinfo = newinfo; | |
1411 | *pentry0 = entry1; | |
1412 | xt_free_table_info(info); | |
1413 | return 0; | |
1414 | ||
1415 | free_newinfo: | |
1416 | xt_free_table_info(newinfo); | |
1417 | out: | |
1418 | COMPAT_ARPT_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j); | |
1419 | return ret; | |
1420 | out_unlock: | |
1421 | xt_compat_flush_offsets(NF_ARP); | |
1422 | xt_compat_unlock(NF_ARP); | |
1423 | goto out; | |
1424 | } | |
1425 | ||
1426 | struct compat_arpt_replace { | |
1427 | char name[ARPT_TABLE_MAXNAMELEN]; | |
1428 | u32 valid_hooks; | |
1429 | u32 num_entries; | |
1430 | u32 size; | |
1431 | u32 hook_entry[NF_ARP_NUMHOOKS]; | |
1432 | u32 underflow[NF_ARP_NUMHOOKS]; | |
1433 | u32 num_counters; | |
1434 | compat_uptr_t counters; | |
1435 | struct compat_arpt_entry entries[0]; | |
1436 | }; | |
1437 | ||
1438 | static int compat_do_replace(void __user *user, unsigned int len) | |
1439 | { | |
1440 | int ret; | |
1441 | struct compat_arpt_replace tmp; | |
1442 | struct xt_table_info *newinfo; | |
1443 | void *loc_cpu_entry; | |
1444 | ||
1445 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1446 | return -EFAULT; | |
1447 | ||
1448 | /* overflow check */ | |
1449 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1450 | return -ENOMEM; | |
1451 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1452 | return -ENOMEM; | |
1453 | ||
1454 | newinfo = xt_alloc_table_info(tmp.size); | |
1455 | if (!newinfo) | |
1456 | return -ENOMEM; | |
1457 | ||
1458 | /* choose the copy that is on our node/cpu */ | |
1459 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1460 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), tmp.size) != 0) { | |
1461 | ret = -EFAULT; | |
1462 | goto free_newinfo; | |
1463 | } | |
1464 | ||
1465 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, | |
1466 | &newinfo, &loc_cpu_entry, tmp.size, | |
1467 | tmp.num_entries, tmp.hook_entry, | |
1468 | tmp.underflow); | |
1469 | if (ret != 0) | |
1470 | goto free_newinfo; | |
1471 | ||
1472 | duprintf("compat_do_replace: Translated table\n"); | |
1473 | ||
1474 | ret = __do_replace(tmp.name, tmp.valid_hooks, newinfo, | |
1475 | tmp.num_counters, compat_ptr(tmp.counters)); | |
1476 | if (ret) | |
1477 | goto free_newinfo_untrans; | |
1478 | return 0; | |
1479 | ||
1480 | free_newinfo_untrans: | |
1481 | ARPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); | |
1482 | free_newinfo: | |
1483 | xt_free_table_info(newinfo); | |
1484 | return ret; | |
1485 | } | |
1486 | ||
1487 | static int compat_do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1488 | unsigned int len) | |
1489 | { | |
1490 | int ret; | |
1491 | ||
1492 | if (!capable(CAP_NET_ADMIN)) | |
1493 | return -EPERM; | |
1494 | ||
1495 | switch (cmd) { | |
1496 | case ARPT_SO_SET_REPLACE: | |
1497 | ret = compat_do_replace(user, len); | |
1498 | break; | |
1499 | ||
1500 | case ARPT_SO_SET_ADD_COUNTERS: | |
1501 | ret = do_add_counters(user, len, 1); | |
1502 | break; | |
1503 | ||
1504 | default: | |
1505 | duprintf("do_arpt_set_ctl: unknown request %i\n", cmd); | |
1506 | ret = -EINVAL; | |
1507 | } | |
1508 | ||
1509 | return ret; | |
1510 | } | |
1511 | ||
1512 | static int compat_copy_entry_to_user(struct arpt_entry *e, void __user **dstptr, | |
1513 | compat_uint_t *size, | |
1514 | struct xt_counters *counters, | |
1515 | unsigned int *i) | |
1516 | { | |
1517 | struct arpt_entry_target *t; | |
1518 | struct compat_arpt_entry __user *ce; | |
1519 | u_int16_t target_offset, next_offset; | |
1520 | compat_uint_t origsize; | |
1521 | int ret; | |
1522 | ||
1523 | ret = -EFAULT; | |
1524 | origsize = *size; | |
1525 | ce = (struct compat_arpt_entry __user *)*dstptr; | |
1526 | if (copy_to_user(ce, e, sizeof(struct arpt_entry))) | |
1527 | goto out; | |
1528 | ||
1529 | if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i]))) | |
1530 | goto out; | |
1531 | ||
1532 | *dstptr += sizeof(struct compat_arpt_entry); | |
1533 | *size -= sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
1534 | ||
1535 | target_offset = e->target_offset - (origsize - *size); | |
1536 | ||
1537 | t = arpt_get_target(e); | |
1538 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1539 | if (ret) | |
1540 | goto out; | |
1541 | ret = -EFAULT; | |
1542 | next_offset = e->next_offset - (origsize - *size); | |
1543 | if (put_user(target_offset, &ce->target_offset)) | |
1544 | goto out; | |
1545 | if (put_user(next_offset, &ce->next_offset)) | |
1546 | goto out; | |
1547 | ||
1548 | (*i)++; | |
1549 | return 0; | |
1550 | out: | |
1551 | return ret; | |
1552 | } | |
1553 | ||
1554 | static int compat_copy_entries_to_user(unsigned int total_size, | |
1555 | struct arpt_table *table, | |
1556 | void __user *userptr) | |
1557 | { | |
1558 | struct xt_counters *counters; | |
1559 | struct xt_table_info *private = table->private; | |
1560 | void __user *pos; | |
1561 | unsigned int size; | |
1562 | int ret = 0; | |
1563 | void *loc_cpu_entry; | |
1564 | unsigned int i = 0; | |
1565 | ||
1566 | counters = alloc_counters(table); | |
1567 | if (IS_ERR(counters)) | |
1568 | return PTR_ERR(counters); | |
1569 | ||
1570 | /* choose the copy on our node/cpu */ | |
1571 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1572 | pos = userptr; | |
1573 | size = total_size; | |
1574 | ret = ARPT_ENTRY_ITERATE(loc_cpu_entry, total_size, | |
1575 | compat_copy_entry_to_user, | |
1576 | &pos, &size, counters, &i); | |
1577 | vfree(counters); | |
1578 | return ret; | |
1579 | } | |
1580 | ||
1581 | struct compat_arpt_get_entries { | |
1582 | char name[ARPT_TABLE_MAXNAMELEN]; | |
1583 | compat_uint_t size; | |
1584 | struct compat_arpt_entry entrytable[0]; | |
1585 | }; | |
1586 | ||
1587 | static int compat_get_entries(struct compat_arpt_get_entries __user *uptr, | |
1588 | int *len) | |
1589 | { | |
1590 | int ret; | |
1591 | struct compat_arpt_get_entries get; | |
1592 | struct arpt_table *t; | |
1593 | ||
1594 | if (*len < sizeof(get)) { | |
1595 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); | |
1596 | return -EINVAL; | |
1597 | } | |
1598 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1599 | return -EFAULT; | |
1600 | if (*len != sizeof(struct compat_arpt_get_entries) + get.size) { | |
1601 | duprintf("compat_get_entries: %u != %zu\n", | |
1602 | *len, sizeof(get) + get.size); | |
1603 | return -EINVAL; | |
1604 | } | |
1605 | ||
1606 | xt_compat_lock(NF_ARP); | |
8d870052 | 1607 | t = xt_find_table_lock(&init_net, NF_ARP, get.name); |
d6a2ba07 PM |
1608 | if (t && !IS_ERR(t)) { |
1609 | struct xt_table_info *private = t->private; | |
1610 | struct xt_table_info info; | |
1611 | ||
1612 | duprintf("t->private->number = %u\n", private->number); | |
1613 | ret = compat_table_info(private, &info); | |
1614 | if (!ret && get.size == info.size) { | |
1615 | ret = compat_copy_entries_to_user(private->size, | |
1616 | t, uptr->entrytable); | |
1617 | } else if (!ret) { | |
1618 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
1619 | private->size, get.size); | |
1620 | ret = -EINVAL; | |
1621 | } | |
1622 | xt_compat_flush_offsets(NF_ARP); | |
1623 | module_put(t->me); | |
1624 | xt_table_unlock(t); | |
1625 | } else | |
1626 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1627 | ||
1628 | xt_compat_unlock(NF_ARP); | |
1629 | return ret; | |
1630 | } | |
1631 | ||
1632 | static int do_arpt_get_ctl(struct sock *, int, void __user *, int *); | |
1633 | ||
1634 | static int compat_do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, | |
1635 | int *len) | |
1636 | { | |
1637 | int ret; | |
1638 | ||
1639 | if (!capable(CAP_NET_ADMIN)) | |
1640 | return -EPERM; | |
1641 | ||
1642 | switch (cmd) { | |
1643 | case ARPT_SO_GET_INFO: | |
1644 | ret = get_info(user, len, 1); | |
1645 | break; | |
1646 | case ARPT_SO_GET_ENTRIES: | |
1647 | ret = compat_get_entries(user, len); | |
1648 | break; | |
1649 | default: | |
1650 | ret = do_arpt_get_ctl(sk, cmd, user, len); | |
1651 | } | |
1652 | return ret; | |
1653 | } | |
1654 | #endif | |
1655 | ||
1da177e4 LT |
1656 | static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1657 | { | |
1658 | int ret; | |
1659 | ||
1660 | if (!capable(CAP_NET_ADMIN)) | |
1661 | return -EPERM; | |
1662 | ||
1663 | switch (cmd) { | |
1664 | case ARPT_SO_SET_REPLACE: | |
1665 | ret = do_replace(user, len); | |
1666 | break; | |
1667 | ||
1668 | case ARPT_SO_SET_ADD_COUNTERS: | |
d6a2ba07 | 1669 | ret = do_add_counters(user, len, 0); |
1da177e4 LT |
1670 | break; |
1671 | ||
1672 | default: | |
1673 | duprintf("do_arpt_set_ctl: unknown request %i\n", cmd); | |
1674 | ret = -EINVAL; | |
1675 | } | |
1676 | ||
1677 | return ret; | |
1678 | } | |
1679 | ||
1680 | static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1681 | { | |
1682 | int ret; | |
1683 | ||
1684 | if (!capable(CAP_NET_ADMIN)) | |
1685 | return -EPERM; | |
1686 | ||
1687 | switch (cmd) { | |
41acd975 | 1688 | case ARPT_SO_GET_INFO: |
d6a2ba07 | 1689 | ret = get_info(user, len, 0); |
41acd975 | 1690 | break; |
1da177e4 | 1691 | |
11f6dff8 PM |
1692 | case ARPT_SO_GET_ENTRIES: |
1693 | ret = get_entries(user, len); | |
1da177e4 | 1694 | break; |
1da177e4 | 1695 | |
6b7d31fc | 1696 | case ARPT_SO_GET_REVISION_TARGET: { |
2e4e6a17 | 1697 | struct xt_get_revision rev; |
6b7d31fc HW |
1698 | |
1699 | if (*len != sizeof(rev)) { | |
1700 | ret = -EINVAL; | |
1701 | break; | |
1702 | } | |
1703 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1704 | ret = -EFAULT; | |
1705 | break; | |
1706 | } | |
1707 | ||
2e4e6a17 HW |
1708 | try_then_request_module(xt_find_revision(NF_ARP, rev.name, |
1709 | rev.revision, 1, &ret), | |
6b7d31fc HW |
1710 | "arpt_%s", rev.name); |
1711 | break; | |
1712 | } | |
1713 | ||
1da177e4 LT |
1714 | default: |
1715 | duprintf("do_arpt_get_ctl: unknown request %i\n", cmd); | |
1716 | ret = -EINVAL; | |
1717 | } | |
1718 | ||
1719 | return ret; | |
1720 | } | |
1721 | ||
1da177e4 LT |
1722 | int arpt_register_table(struct arpt_table *table, |
1723 | const struct arpt_replace *repl) | |
1724 | { | |
1725 | int ret; | |
2e4e6a17 | 1726 | struct xt_table_info *newinfo; |
259d4e41 | 1727 | struct xt_table_info bootstrap |
1da177e4 | 1728 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 1729 | void *loc_cpu_entry; |
a98da11d | 1730 | struct xt_table *new_table; |
1da177e4 | 1731 | |
2e4e6a17 | 1732 | newinfo = xt_alloc_table_info(repl->size); |
1da177e4 LT |
1733 | if (!newinfo) { |
1734 | ret = -ENOMEM; | |
1735 | return ret; | |
1736 | } | |
31836064 ED |
1737 | |
1738 | /* choose the copy on our node/cpu */ | |
1739 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1740 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
1741 | |
1742 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 1743 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
1744 | repl->num_entries, |
1745 | repl->hook_entry, | |
1746 | repl->underflow); | |
2e4e6a17 | 1747 | |
1da177e4 LT |
1748 | duprintf("arpt_register_table: translate table gives %d\n", ret); |
1749 | if (ret != 0) { | |
2e4e6a17 | 1750 | xt_free_table_info(newinfo); |
1da177e4 LT |
1751 | return ret; |
1752 | } | |
1753 | ||
8d870052 | 1754 | new_table = xt_register_table(&init_net, table, &bootstrap, newinfo); |
a98da11d | 1755 | if (IS_ERR(new_table)) { |
2e4e6a17 | 1756 | xt_free_table_info(newinfo); |
a98da11d | 1757 | return PTR_ERR(new_table); |
1da177e4 LT |
1758 | } |
1759 | ||
2e4e6a17 | 1760 | return 0; |
1da177e4 LT |
1761 | } |
1762 | ||
1763 | void arpt_unregister_table(struct arpt_table *table) | |
1764 | { | |
2e4e6a17 | 1765 | struct xt_table_info *private; |
31836064 ED |
1766 | void *loc_cpu_entry; |
1767 | ||
2e4e6a17 | 1768 | private = xt_unregister_table(table); |
1da177e4 LT |
1769 | |
1770 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
1771 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
1772 | ARPT_ENTRY_ITERATE(loc_cpu_entry, private->size, | |
1da177e4 | 1773 | cleanup_entry, NULL); |
2e4e6a17 | 1774 | xt_free_table_info(private); |
1da177e4 LT |
1775 | } |
1776 | ||
1777 | /* The built-in targets: standard (NULL) and error. */ | |
9f15c530 | 1778 | static struct arpt_target arpt_standard_target __read_mostly = { |
1da177e4 | 1779 | .name = ARPT_STANDARD_TARGET, |
aa83c1ab | 1780 | .targetsize = sizeof(int), |
a45049c5 | 1781 | .family = NF_ARP, |
d6a2ba07 PM |
1782 | #ifdef CONFIG_COMPAT |
1783 | .compatsize = sizeof(compat_int_t), | |
1784 | .compat_from_user = compat_standard_from_user, | |
1785 | .compat_to_user = compat_standard_to_user, | |
1786 | #endif | |
1da177e4 LT |
1787 | }; |
1788 | ||
9f15c530 | 1789 | static struct arpt_target arpt_error_target __read_mostly = { |
1da177e4 LT |
1790 | .name = ARPT_ERROR_TARGET, |
1791 | .target = arpt_error, | |
aa83c1ab | 1792 | .targetsize = ARPT_FUNCTION_MAXNAMELEN, |
a45049c5 | 1793 | .family = NF_ARP, |
1da177e4 LT |
1794 | }; |
1795 | ||
1796 | static struct nf_sockopt_ops arpt_sockopts = { | |
1797 | .pf = PF_INET, | |
1798 | .set_optmin = ARPT_BASE_CTL, | |
1799 | .set_optmax = ARPT_SO_SET_MAX+1, | |
1800 | .set = do_arpt_set_ctl, | |
d6a2ba07 PM |
1801 | #ifdef CONFIG_COMPAT |
1802 | .compat_set = compat_do_arpt_set_ctl, | |
1803 | #endif | |
1da177e4 LT |
1804 | .get_optmin = ARPT_BASE_CTL, |
1805 | .get_optmax = ARPT_SO_GET_MAX+1, | |
1806 | .get = do_arpt_get_ctl, | |
d6a2ba07 PM |
1807 | #ifdef CONFIG_COMPAT |
1808 | .compat_get = compat_do_arpt_get_ctl, | |
1809 | #endif | |
16fcec35 | 1810 | .owner = THIS_MODULE, |
1da177e4 LT |
1811 | }; |
1812 | ||
65b4b4e8 | 1813 | static int __init arp_tables_init(void) |
1da177e4 LT |
1814 | { |
1815 | int ret; | |
1816 | ||
0eff66e6 PM |
1817 | ret = xt_proto_init(NF_ARP); |
1818 | if (ret < 0) | |
1819 | goto err1; | |
2e4e6a17 | 1820 | |
1da177e4 | 1821 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
1822 | ret = xt_register_target(&arpt_standard_target); |
1823 | if (ret < 0) | |
1824 | goto err2; | |
1825 | ret = xt_register_target(&arpt_error_target); | |
1826 | if (ret < 0) | |
1827 | goto err3; | |
1da177e4 LT |
1828 | |
1829 | /* Register setsockopt */ | |
1830 | ret = nf_register_sockopt(&arpt_sockopts); | |
0eff66e6 PM |
1831 | if (ret < 0) |
1832 | goto err4; | |
1da177e4 | 1833 | |
a887c1c1 | 1834 | printk(KERN_INFO "arp_tables: (C) 2002 David S. Miller\n"); |
1da177e4 | 1835 | return 0; |
0eff66e6 PM |
1836 | |
1837 | err4: | |
1838 | xt_unregister_target(&arpt_error_target); | |
1839 | err3: | |
1840 | xt_unregister_target(&arpt_standard_target); | |
1841 | err2: | |
1842 | xt_proto_fini(NF_ARP); | |
1843 | err1: | |
1844 | return ret; | |
1da177e4 LT |
1845 | } |
1846 | ||
65b4b4e8 | 1847 | static void __exit arp_tables_fini(void) |
1da177e4 LT |
1848 | { |
1849 | nf_unregister_sockopt(&arpt_sockopts); | |
f603b6ec PM |
1850 | xt_unregister_target(&arpt_error_target); |
1851 | xt_unregister_target(&arpt_standard_target); | |
2e4e6a17 | 1852 | xt_proto_fini(NF_ARP); |
1da177e4 LT |
1853 | } |
1854 | ||
1855 | EXPORT_SYMBOL(arpt_register_table); | |
1856 | EXPORT_SYMBOL(arpt_unregister_table); | |
1857 | EXPORT_SYMBOL(arpt_do_table); | |
1da177e4 | 1858 | |
65b4b4e8 AM |
1859 | module_init(arp_tables_init); |
1860 | module_exit(arp_tables_fini); |