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> | |
22 | ||
23 | #include <asm/uaccess.h> | |
57b47a53 | 24 | #include <linux/mutex.h> |
1da177e4 | 25 | |
2e4e6a17 | 26 | #include <linux/netfilter/x_tables.h> |
1da177e4 LT |
27 | #include <linux/netfilter_arp/arp_tables.h> |
28 | ||
29 | MODULE_LICENSE("GPL"); | |
30 | MODULE_AUTHOR("David S. Miller <davem@redhat.com>"); | |
31 | MODULE_DESCRIPTION("arptables core"); | |
32 | ||
33 | /*#define DEBUG_ARP_TABLES*/ | |
34 | /*#define DEBUG_ARP_TABLES_USER*/ | |
35 | ||
36 | #ifdef DEBUG_ARP_TABLES | |
37 | #define dprintf(format, args...) printk(format , ## args) | |
38 | #else | |
39 | #define dprintf(format, args...) | |
40 | #endif | |
41 | ||
42 | #ifdef DEBUG_ARP_TABLES_USER | |
43 | #define duprintf(format, args...) printk(format , ## args) | |
44 | #else | |
45 | #define duprintf(format, args...) | |
46 | #endif | |
47 | ||
48 | #ifdef CONFIG_NETFILTER_DEBUG | |
49 | #define ARP_NF_ASSERT(x) \ | |
50 | do { \ | |
51 | if (!(x)) \ | |
52 | printk("ARP_NF_ASSERT: %s:%s:%u\n", \ | |
53 | __FUNCTION__, __FILE__, __LINE__); \ | |
54 | } while(0) | |
55 | #else | |
56 | #define ARP_NF_ASSERT(x) | |
57 | #endif | |
1da177e4 | 58 | |
1da177e4 LT |
59 | #include <linux/netfilter_ipv4/listhelp.h> |
60 | ||
1da177e4 LT |
61 | static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap, |
62 | char *hdr_addr, int len) | |
63 | { | |
64 | int i, ret; | |
65 | ||
66 | if (len > ARPT_DEV_ADDR_LEN_MAX) | |
67 | len = ARPT_DEV_ADDR_LEN_MAX; | |
68 | ||
69 | ret = 0; | |
70 | for (i = 0; i < len; i++) | |
71 | ret |= (hdr_addr[i] ^ ap->addr[i]) & ap->mask[i]; | |
72 | ||
73 | return (ret != 0); | |
74 | } | |
75 | ||
76 | /* Returns whether packet matches rule or not. */ | |
77 | static inline int arp_packet_match(const struct arphdr *arphdr, | |
78 | struct net_device *dev, | |
79 | const char *indev, | |
80 | const char *outdev, | |
81 | const struct arpt_arp *arpinfo) | |
82 | { | |
83 | char *arpptr = (char *)(arphdr + 1); | |
84 | char *src_devaddr, *tgt_devaddr; | |
85 | u32 src_ipaddr, tgt_ipaddr; | |
86 | int i, ret; | |
87 | ||
88 | #define FWINV(bool,invflg) ((bool) ^ !!(arpinfo->invflags & invflg)) | |
89 | ||
90 | if (FWINV((arphdr->ar_op & arpinfo->arpop_mask) != arpinfo->arpop, | |
91 | ARPT_INV_ARPOP)) { | |
92 | dprintf("ARP operation field mismatch.\n"); | |
93 | dprintf("ar_op: %04x info->arpop: %04x info->arpop_mask: %04x\n", | |
94 | arphdr->ar_op, arpinfo->arpop, arpinfo->arpop_mask); | |
95 | return 0; | |
96 | } | |
97 | ||
98 | if (FWINV((arphdr->ar_hrd & arpinfo->arhrd_mask) != arpinfo->arhrd, | |
99 | ARPT_INV_ARPHRD)) { | |
100 | dprintf("ARP hardware address format mismatch.\n"); | |
101 | dprintf("ar_hrd: %04x info->arhrd: %04x info->arhrd_mask: %04x\n", | |
102 | arphdr->ar_hrd, arpinfo->arhrd, arpinfo->arhrd_mask); | |
103 | return 0; | |
104 | } | |
105 | ||
106 | if (FWINV((arphdr->ar_pro & arpinfo->arpro_mask) != arpinfo->arpro, | |
107 | ARPT_INV_ARPPRO)) { | |
108 | dprintf("ARP protocol address format mismatch.\n"); | |
109 | dprintf("ar_pro: %04x info->arpro: %04x info->arpro_mask: %04x\n", | |
110 | arphdr->ar_pro, arpinfo->arpro, arpinfo->arpro_mask); | |
111 | return 0; | |
112 | } | |
113 | ||
114 | if (FWINV((arphdr->ar_hln & arpinfo->arhln_mask) != arpinfo->arhln, | |
115 | ARPT_INV_ARPHLN)) { | |
116 | dprintf("ARP hardware address length mismatch.\n"); | |
117 | dprintf("ar_hln: %02x info->arhln: %02x info->arhln_mask: %02x\n", | |
118 | arphdr->ar_hln, arpinfo->arhln, arpinfo->arhln_mask); | |
119 | return 0; | |
120 | } | |
121 | ||
122 | src_devaddr = arpptr; | |
123 | arpptr += dev->addr_len; | |
124 | memcpy(&src_ipaddr, arpptr, sizeof(u32)); | |
125 | arpptr += sizeof(u32); | |
126 | tgt_devaddr = arpptr; | |
127 | arpptr += dev->addr_len; | |
128 | memcpy(&tgt_ipaddr, arpptr, sizeof(u32)); | |
129 | ||
130 | if (FWINV(arp_devaddr_compare(&arpinfo->src_devaddr, src_devaddr, dev->addr_len), | |
131 | ARPT_INV_SRCDEVADDR) || | |
132 | FWINV(arp_devaddr_compare(&arpinfo->tgt_devaddr, tgt_devaddr, dev->addr_len), | |
133 | ARPT_INV_TGTDEVADDR)) { | |
134 | dprintf("Source or target device address mismatch.\n"); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | if (FWINV((src_ipaddr & arpinfo->smsk.s_addr) != arpinfo->src.s_addr, | |
140 | ARPT_INV_SRCIP) || | |
141 | FWINV(((tgt_ipaddr & arpinfo->tmsk.s_addr) != arpinfo->tgt.s_addr), | |
142 | ARPT_INV_TGTIP)) { | |
143 | dprintf("Source or target IP address mismatch.\n"); | |
144 | ||
145 | dprintf("SRC: %u.%u.%u.%u. Mask: %u.%u.%u.%u. Target: %u.%u.%u.%u.%s\n", | |
146 | NIPQUAD(src_ipaddr), | |
147 | NIPQUAD(arpinfo->smsk.s_addr), | |
148 | NIPQUAD(arpinfo->src.s_addr), | |
149 | arpinfo->invflags & ARPT_INV_SRCIP ? " (INV)" : ""); | |
150 | dprintf("TGT: %u.%u.%u.%u Mask: %u.%u.%u.%u Target: %u.%u.%u.%u.%s\n", | |
151 | NIPQUAD(tgt_ipaddr), | |
152 | NIPQUAD(arpinfo->tmsk.s_addr), | |
153 | NIPQUAD(arpinfo->tgt.s_addr), | |
154 | arpinfo->invflags & ARPT_INV_TGTIP ? " (INV)" : ""); | |
155 | return 0; | |
156 | } | |
157 | ||
158 | /* Look for ifname matches. */ | |
159 | for (i = 0, ret = 0; i < IFNAMSIZ; i++) { | |
160 | ret |= (indev[i] ^ arpinfo->iniface[i]) | |
161 | & arpinfo->iniface_mask[i]; | |
162 | } | |
163 | ||
164 | if (FWINV(ret != 0, ARPT_INV_VIA_IN)) { | |
165 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
166 | indev, arpinfo->iniface, | |
167 | arpinfo->invflags&ARPT_INV_VIA_IN ?" (INV)":""); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
172 | unsigned long odev; | |
173 | memcpy(&odev, outdev + i*sizeof(unsigned long), | |
174 | sizeof(unsigned long)); | |
175 | ret |= (odev | |
176 | ^ ((const unsigned long *)arpinfo->outiface)[i]) | |
177 | & ((const unsigned long *)arpinfo->outiface_mask)[i]; | |
178 | } | |
179 | ||
180 | if (FWINV(ret != 0, ARPT_INV_VIA_OUT)) { | |
181 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
182 | outdev, arpinfo->outiface, | |
183 | arpinfo->invflags&ARPT_INV_VIA_OUT ?" (INV)":""); | |
184 | return 0; | |
185 | } | |
186 | ||
187 | return 1; | |
188 | } | |
189 | ||
190 | static inline int arp_checkentry(const struct arpt_arp *arp) | |
191 | { | |
192 | if (arp->flags & ~ARPT_F_MASK) { | |
193 | duprintf("Unknown flag bits set: %08X\n", | |
194 | arp->flags & ~ARPT_F_MASK); | |
195 | return 0; | |
196 | } | |
197 | if (arp->invflags & ~ARPT_INV_MASK) { | |
198 | duprintf("Unknown invflag bits set: %08X\n", | |
199 | arp->invflags & ~ARPT_INV_MASK); | |
200 | return 0; | |
201 | } | |
202 | ||
203 | return 1; | |
204 | } | |
205 | ||
206 | static unsigned int arpt_error(struct sk_buff **pskb, | |
1da177e4 LT |
207 | const struct net_device *in, |
208 | const struct net_device *out, | |
2e4e6a17 | 209 | unsigned int hooknum, |
c4986734 | 210 | const struct xt_target *target, |
1da177e4 LT |
211 | const void *targinfo, |
212 | void *userinfo) | |
213 | { | |
214 | if (net_ratelimit()) | |
215 | printk("arp_tables: error: '%s'\n", (char *)targinfo); | |
216 | ||
217 | return NF_DROP; | |
218 | } | |
219 | ||
220 | static inline struct arpt_entry *get_entry(void *base, unsigned int offset) | |
221 | { | |
222 | return (struct arpt_entry *)(base + offset); | |
223 | } | |
224 | ||
225 | unsigned int arpt_do_table(struct sk_buff **pskb, | |
226 | unsigned int hook, | |
227 | const struct net_device *in, | |
228 | const struct net_device *out, | |
229 | struct arpt_table *table, | |
230 | void *userdata) | |
231 | { | |
232 | static const char nulldevname[IFNAMSIZ]; | |
233 | unsigned int verdict = NF_DROP; | |
234 | struct arphdr *arp; | |
235 | int hotdrop = 0; | |
236 | struct arpt_entry *e, *back; | |
237 | const char *indev, *outdev; | |
238 | void *table_base; | |
e0b7cde9 | 239 | struct xt_table_info *private; |
1da177e4 LT |
240 | |
241 | /* ARP header, plus 2 device addresses, plus 2 IP addresses. */ | |
242 | if (!pskb_may_pull((*pskb), (sizeof(struct arphdr) + | |
243 | (2 * (*pskb)->dev->addr_len) + | |
244 | (2 * sizeof(u32))))) | |
245 | return NF_DROP; | |
246 | ||
247 | indev = in ? in->name : nulldevname; | |
248 | outdev = out ? out->name : nulldevname; | |
249 | ||
250 | read_lock_bh(&table->lock); | |
e0b7cde9 | 251 | private = table->private; |
2e4e6a17 HW |
252 | table_base = (void *)private->entries[smp_processor_id()]; |
253 | e = get_entry(table_base, private->hook_entry[hook]); | |
254 | back = get_entry(table_base, private->underflow[hook]); | |
1da177e4 LT |
255 | |
256 | arp = (*pskb)->nh.arph; | |
257 | do { | |
258 | if (arp_packet_match(arp, (*pskb)->dev, indev, outdev, &e->arp)) { | |
259 | struct arpt_entry_target *t; | |
260 | int hdr_len; | |
261 | ||
262 | hdr_len = sizeof(*arp) + (2 * sizeof(struct in_addr)) + | |
263 | (2 * (*pskb)->dev->addr_len); | |
264 | ADD_COUNTER(e->counters, hdr_len, 1); | |
265 | ||
266 | t = arpt_get_target(e); | |
267 | ||
268 | /* Standard target? */ | |
269 | if (!t->u.kernel.target->target) { | |
270 | int v; | |
271 | ||
272 | v = ((struct arpt_standard_target *)t)->verdict; | |
273 | if (v < 0) { | |
274 | /* Pop from stack? */ | |
275 | if (v != ARPT_RETURN) { | |
276 | verdict = (unsigned)(-v) - 1; | |
277 | break; | |
278 | } | |
279 | e = back; | |
280 | back = get_entry(table_base, | |
281 | back->comefrom); | |
282 | continue; | |
283 | } | |
284 | if (table_base + v | |
285 | != (void *)e + e->next_offset) { | |
286 | /* Save old back ptr in next entry */ | |
287 | struct arpt_entry *next | |
288 | = (void *)e + e->next_offset; | |
289 | next->comefrom = | |
290 | (void *)back - table_base; | |
291 | ||
292 | /* set back pointer to next entry */ | |
293 | back = next; | |
294 | } | |
295 | ||
296 | e = get_entry(table_base, v); | |
297 | } else { | |
298 | /* Targets which reenter must return | |
299 | * abs. verdicts | |
300 | */ | |
301 | verdict = t->u.kernel.target->target(pskb, | |
1da177e4 | 302 | in, out, |
2e4e6a17 | 303 | hook, |
1c524830 | 304 | t->u.kernel.target, |
1da177e4 LT |
305 | t->data, |
306 | userdata); | |
307 | ||
308 | /* Target might have changed stuff. */ | |
309 | arp = (*pskb)->nh.arph; | |
310 | ||
311 | if (verdict == ARPT_CONTINUE) | |
312 | e = (void *)e + e->next_offset; | |
313 | else | |
314 | /* Verdict */ | |
315 | break; | |
316 | } | |
317 | } else { | |
318 | e = (void *)e + e->next_offset; | |
319 | } | |
320 | } while (!hotdrop); | |
321 | read_unlock_bh(&table->lock); | |
322 | ||
323 | if (hotdrop) | |
324 | return NF_DROP; | |
325 | else | |
326 | return verdict; | |
327 | } | |
328 | ||
1da177e4 LT |
329 | /* All zeroes == unconditional rule. */ |
330 | static inline int unconditional(const struct arpt_arp *arp) | |
331 | { | |
332 | unsigned int i; | |
333 | ||
334 | for (i = 0; i < sizeof(*arp)/sizeof(__u32); i++) | |
335 | if (((__u32 *)arp)[i]) | |
336 | return 0; | |
337 | ||
338 | return 1; | |
339 | } | |
340 | ||
341 | /* Figures out from what hook each rule can be called: returns 0 if | |
342 | * there are loops. Puts hook bitmask in comefrom. | |
343 | */ | |
2e4e6a17 | 344 | static int mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 345 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
346 | { |
347 | unsigned int hook; | |
348 | ||
349 | /* No recursion; use packet counter to save back ptrs (reset | |
350 | * to 0 as we leave), and comefrom to save source hook bitmask. | |
351 | */ | |
352 | for (hook = 0; hook < NF_ARP_NUMHOOKS; hook++) { | |
353 | unsigned int pos = newinfo->hook_entry[hook]; | |
354 | struct arpt_entry *e | |
31836064 | 355 | = (struct arpt_entry *)(entry0 + pos); |
1da177e4 LT |
356 | |
357 | if (!(valid_hooks & (1 << hook))) | |
358 | continue; | |
359 | ||
360 | /* Set initial back pointer. */ | |
361 | e->counters.pcnt = pos; | |
362 | ||
363 | for (;;) { | |
364 | struct arpt_standard_target *t | |
365 | = (void *)arpt_get_target(e); | |
366 | ||
367 | if (e->comefrom & (1 << NF_ARP_NUMHOOKS)) { | |
368 | printk("arptables: loop hook %u pos %u %08X.\n", | |
369 | hook, pos, e->comefrom); | |
370 | return 0; | |
371 | } | |
372 | e->comefrom | |
373 | |= ((1 << hook) | (1 << NF_ARP_NUMHOOKS)); | |
374 | ||
375 | /* Unconditional return/END. */ | |
376 | if (e->target_offset == sizeof(struct arpt_entry) | |
377 | && (strcmp(t->target.u.user.name, | |
378 | ARPT_STANDARD_TARGET) == 0) | |
379 | && t->verdict < 0 | |
380 | && unconditional(&e->arp)) { | |
381 | unsigned int oldpos, size; | |
382 | ||
383 | /* Return: backtrack through the last | |
384 | * big jump. | |
385 | */ | |
386 | do { | |
387 | e->comefrom ^= (1<<NF_ARP_NUMHOOKS); | |
388 | oldpos = pos; | |
389 | pos = e->counters.pcnt; | |
390 | e->counters.pcnt = 0; | |
391 | ||
392 | /* We're at the start. */ | |
393 | if (pos == oldpos) | |
394 | goto next; | |
395 | ||
396 | e = (struct arpt_entry *) | |
31836064 | 397 | (entry0 + pos); |
1da177e4 LT |
398 | } while (oldpos == pos + e->next_offset); |
399 | ||
400 | /* Move along one */ | |
401 | size = e->next_offset; | |
402 | e = (struct arpt_entry *) | |
31836064 | 403 | (entry0 + pos + size); |
1da177e4 LT |
404 | e->counters.pcnt = pos; |
405 | pos += size; | |
406 | } else { | |
407 | int newpos = t->verdict; | |
408 | ||
409 | if (strcmp(t->target.u.user.name, | |
410 | ARPT_STANDARD_TARGET) == 0 | |
411 | && newpos >= 0) { | |
412 | /* This a jump; chase it. */ | |
413 | duprintf("Jump rule %u -> %u\n", | |
414 | pos, newpos); | |
415 | } else { | |
416 | /* ... this is a fallthru */ | |
417 | newpos = pos + e->next_offset; | |
418 | } | |
419 | e = (struct arpt_entry *) | |
31836064 | 420 | (entry0 + newpos); |
1da177e4 LT |
421 | e->counters.pcnt = pos; |
422 | pos = newpos; | |
423 | } | |
424 | } | |
425 | next: | |
426 | duprintf("Finished chain %u\n", hook); | |
427 | } | |
428 | return 1; | |
429 | } | |
430 | ||
431 | static inline int standard_check(const struct arpt_entry_target *t, | |
432 | unsigned int max_offset) | |
433 | { | |
434 | struct arpt_standard_target *targ = (void *)t; | |
435 | ||
436 | /* Check standard info. */ | |
437 | if (t->u.target_size | |
438 | != ARPT_ALIGN(sizeof(struct arpt_standard_target))) { | |
439 | duprintf("arpt_standard_check: target size %u != %Zu\n", | |
440 | t->u.target_size, | |
441 | ARPT_ALIGN(sizeof(struct arpt_standard_target))); | |
442 | return 0; | |
443 | } | |
444 | ||
445 | if (targ->verdict >= 0 | |
446 | && targ->verdict > max_offset - sizeof(struct arpt_entry)) { | |
447 | duprintf("arpt_standard_check: bad verdict (%i)\n", | |
448 | targ->verdict); | |
449 | return 0; | |
450 | } | |
451 | ||
452 | if (targ->verdict < -NF_MAX_VERDICT - 1) { | |
453 | duprintf("arpt_standard_check: bad negative verdict (%i)\n", | |
454 | targ->verdict); | |
455 | return 0; | |
456 | } | |
457 | return 1; | |
458 | } | |
459 | ||
460 | static struct arpt_target arpt_standard_target; | |
461 | ||
462 | static inline int check_entry(struct arpt_entry *e, const char *name, unsigned int size, | |
463 | unsigned int *i) | |
464 | { | |
465 | struct arpt_entry_target *t; | |
466 | struct arpt_target *target; | |
467 | int ret; | |
468 | ||
469 | if (!arp_checkentry(&e->arp)) { | |
470 | duprintf("arp_tables: arp check failed %p %s.\n", e, name); | |
471 | return -EINVAL; | |
472 | } | |
473 | ||
474 | t = arpt_get_target(e); | |
2e4e6a17 HW |
475 | target = try_then_request_module(xt_find_target(NF_ARP, t->u.user.name, |
476 | t->u.user.revision), | |
6b7d31fc HW |
477 | "arpt_%s", t->u.user.name); |
478 | if (IS_ERR(target) || !target) { | |
1da177e4 | 479 | duprintf("check_entry: `%s' not found\n", t->u.user.name); |
6b7d31fc | 480 | ret = target ? PTR_ERR(target) : -ENOENT; |
1da177e4 LT |
481 | goto out; |
482 | } | |
1da177e4 | 483 | t->u.kernel.target = target; |
1da177e4 | 484 | |
3cdc7c95 PM |
485 | ret = xt_check_target(target, NF_ARP, t->u.target_size - sizeof(*t), |
486 | name, e->comefrom, 0, 0); | |
487 | if (ret) | |
488 | goto err; | |
489 | ||
1da177e4 LT |
490 | if (t->u.kernel.target == &arpt_standard_target) { |
491 | if (!standard_check(t, size)) { | |
492 | ret = -EINVAL; | |
493 | goto out; | |
494 | } | |
495 | } else if (t->u.kernel.target->checkentry | |
1c524830 | 496 | && !t->u.kernel.target->checkentry(name, e, target, t->data, |
1da177e4 LT |
497 | t->u.target_size |
498 | - sizeof(*t), | |
499 | e->comefrom)) { | |
1da177e4 LT |
500 | duprintf("arp_tables: check failed for `%s'.\n", |
501 | t->u.kernel.target->name); | |
502 | ret = -EINVAL; | |
3cdc7c95 | 503 | goto err; |
1da177e4 LT |
504 | } |
505 | ||
506 | (*i)++; | |
507 | return 0; | |
3cdc7c95 PM |
508 | err: |
509 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
510 | out: |
511 | return ret; | |
512 | } | |
513 | ||
514 | static inline int check_entry_size_and_hooks(struct arpt_entry *e, | |
2e4e6a17 | 515 | struct xt_table_info *newinfo, |
1da177e4 LT |
516 | unsigned char *base, |
517 | unsigned char *limit, | |
518 | const unsigned int *hook_entries, | |
519 | const unsigned int *underflows, | |
520 | unsigned int *i) | |
521 | { | |
522 | unsigned int h; | |
523 | ||
524 | if ((unsigned long)e % __alignof__(struct arpt_entry) != 0 | |
525 | || (unsigned char *)e + sizeof(struct arpt_entry) >= limit) { | |
526 | duprintf("Bad offset %p\n", e); | |
527 | return -EINVAL; | |
528 | } | |
529 | ||
530 | if (e->next_offset | |
531 | < sizeof(struct arpt_entry) + sizeof(struct arpt_entry_target)) { | |
532 | duprintf("checking: element %p size %u\n", | |
533 | e, e->next_offset); | |
534 | return -EINVAL; | |
535 | } | |
536 | ||
537 | /* Check hooks & underflows */ | |
538 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { | |
539 | if ((unsigned char *)e - base == hook_entries[h]) | |
540 | newinfo->hook_entry[h] = hook_entries[h]; | |
541 | if ((unsigned char *)e - base == underflows[h]) | |
542 | newinfo->underflow[h] = underflows[h]; | |
543 | } | |
544 | ||
545 | /* FIXME: underflows must be unconditional, standard verdicts | |
546 | < 0 (not ARPT_RETURN). --RR */ | |
547 | ||
548 | /* Clear counters and comefrom */ | |
2e4e6a17 | 549 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
550 | e->comefrom = 0; |
551 | ||
552 | (*i)++; | |
553 | return 0; | |
554 | } | |
555 | ||
556 | static inline int cleanup_entry(struct arpt_entry *e, unsigned int *i) | |
557 | { | |
558 | struct arpt_entry_target *t; | |
559 | ||
560 | if (i && (*i)-- == 0) | |
561 | return 1; | |
562 | ||
563 | t = arpt_get_target(e); | |
564 | if (t->u.kernel.target->destroy) | |
1c524830 | 565 | t->u.kernel.target->destroy(t->u.kernel.target, t->data, |
1da177e4 LT |
566 | t->u.target_size - sizeof(*t)); |
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 | ||
31836064 | 632 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) { |
1da177e4 LT |
633 | duprintf("Looping hook\n"); |
634 | return -ELOOP; | |
635 | } | |
636 | ||
637 | /* Finally, each sanity check must pass */ | |
638 | i = 0; | |
31836064 | 639 | ret = ARPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
640 | check_entry, name, size, &i); |
641 | ||
642 | if (ret != 0) { | |
31836064 | 643 | ARPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
644 | cleanup_entry, &i); |
645 | return ret; | |
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 | ||
711 | static int copy_entries_to_user(unsigned int total_size, | |
712 | struct arpt_table *table, | |
713 | void __user *userptr) | |
714 | { | |
715 | unsigned int off, num, countersize; | |
716 | struct arpt_entry *e; | |
2e4e6a17 HW |
717 | struct xt_counters *counters; |
718 | struct xt_table_info *private = table->private; | |
1da177e4 | 719 | int ret = 0; |
31836064 | 720 | void *loc_cpu_entry; |
1da177e4 LT |
721 | |
722 | /* We need atomic snapshot of counters: rest doesn't change | |
723 | * (other than comefrom, which userspace doesn't care | |
724 | * about). | |
725 | */ | |
2e4e6a17 HW |
726 | countersize = sizeof(struct xt_counters) * private->number; |
727 | counters = vmalloc_node(countersize, numa_node_id()); | |
1da177e4 LT |
728 | |
729 | if (counters == NULL) | |
730 | return -ENOMEM; | |
731 | ||
732 | /* First, sum counters... */ | |
1da177e4 | 733 | write_lock_bh(&table->lock); |
2e4e6a17 | 734 | get_counters(private, counters); |
1da177e4 LT |
735 | write_unlock_bh(&table->lock); |
736 | ||
2e4e6a17 | 737 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 ED |
738 | /* ... then copy entire thing ... */ |
739 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { | |
1da177e4 LT |
740 | ret = -EFAULT; |
741 | goto free_counters; | |
742 | } | |
743 | ||
744 | /* FIXME: use iterator macros --RR */ | |
745 | /* ... then go back and fix counters and names */ | |
746 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
747 | struct arpt_entry_target *t; | |
748 | ||
31836064 | 749 | e = (struct arpt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
750 | if (copy_to_user(userptr + off |
751 | + offsetof(struct arpt_entry, counters), | |
752 | &counters[num], | |
753 | sizeof(counters[num])) != 0) { | |
754 | ret = -EFAULT; | |
755 | goto free_counters; | |
756 | } | |
757 | ||
758 | t = arpt_get_target(e); | |
759 | if (copy_to_user(userptr + off + e->target_offset | |
760 | + offsetof(struct arpt_entry_target, | |
761 | u.user.name), | |
762 | t->u.kernel.target->name, | |
763 | strlen(t->u.kernel.target->name)+1) != 0) { | |
764 | ret = -EFAULT; | |
765 | goto free_counters; | |
766 | } | |
767 | } | |
768 | ||
769 | free_counters: | |
770 | vfree(counters); | |
771 | return ret; | |
772 | } | |
773 | ||
774 | static int get_entries(const struct arpt_get_entries *entries, | |
775 | struct arpt_get_entries __user *uptr) | |
776 | { | |
777 | int ret; | |
778 | struct arpt_table *t; | |
779 | ||
2e4e6a17 | 780 | t = xt_find_table_lock(NF_ARP, entries->name); |
31fe4d33 | 781 | if (t && !IS_ERR(t)) { |
2e4e6a17 | 782 | struct xt_table_info *private = t->private; |
1da177e4 | 783 | duprintf("t->private->number = %u\n", |
2e4e6a17 HW |
784 | private->number); |
785 | if (entries->size == private->size) | |
786 | ret = copy_entries_to_user(private->size, | |
1da177e4 LT |
787 | t, uptr->entrytable); |
788 | else { | |
789 | duprintf("get_entries: I've got %u not %u!\n", | |
2e4e6a17 | 790 | private->size, entries->size); |
1da177e4 LT |
791 | ret = -EINVAL; |
792 | } | |
6b7d31fc | 793 | module_put(t->me); |
2e4e6a17 | 794 | xt_table_unlock(t); |
1da177e4 | 795 | } else |
6b7d31fc | 796 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
797 | |
798 | return ret; | |
799 | } | |
800 | ||
801 | static int do_replace(void __user *user, unsigned int len) | |
802 | { | |
803 | int ret; | |
804 | struct arpt_replace tmp; | |
805 | struct arpt_table *t; | |
2e4e6a17 HW |
806 | struct xt_table_info *newinfo, *oldinfo; |
807 | struct xt_counters *counters; | |
31836064 | 808 | void *loc_cpu_entry, *loc_cpu_old_entry; |
1da177e4 LT |
809 | |
810 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
811 | return -EFAULT; | |
812 | ||
813 | /* Hack: Causes ipchains to give correct error msg --RR */ | |
814 | if (len != sizeof(tmp) + tmp.size) | |
815 | return -ENOPROTOOPT; | |
816 | ||
ee4bb818 KK |
817 | /* overflow check */ |
818 | if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS - | |
819 | SMP_CACHE_BYTES) | |
820 | return -ENOMEM; | |
821 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
822 | return -ENOMEM; | |
823 | ||
2e4e6a17 | 824 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
825 | if (!newinfo) |
826 | return -ENOMEM; | |
827 | ||
31836064 ED |
828 | /* choose the copy that is on our node/cpu */ |
829 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
830 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
831 | tmp.size) != 0) { |
832 | ret = -EFAULT; | |
833 | goto free_newinfo; | |
834 | } | |
835 | ||
2e4e6a17 | 836 | counters = vmalloc(tmp.num_counters * sizeof(struct xt_counters)); |
1da177e4 LT |
837 | if (!counters) { |
838 | ret = -ENOMEM; | |
839 | goto free_newinfo; | |
840 | } | |
1da177e4 LT |
841 | |
842 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
31836064 | 843 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, |
1da177e4 LT |
844 | tmp.hook_entry, tmp.underflow); |
845 | if (ret != 0) | |
846 | goto free_newinfo_counters; | |
847 | ||
848 | duprintf("arp_tables: Translated table\n"); | |
849 | ||
2e4e6a17 | 850 | t = try_then_request_module(xt_find_table_lock(NF_ARP, tmp.name), |
6b7d31fc HW |
851 | "arptable_%s", tmp.name); |
852 | if (!t || IS_ERR(t)) { | |
853 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 854 | goto free_newinfo_counters_untrans; |
6b7d31fc | 855 | } |
1da177e4 LT |
856 | |
857 | /* You lied! */ | |
858 | if (tmp.valid_hooks != t->valid_hooks) { | |
859 | duprintf("Valid hook crap: %08X vs %08X\n", | |
860 | tmp.valid_hooks, t->valid_hooks); | |
861 | ret = -EINVAL; | |
6b7d31fc | 862 | goto put_module; |
1da177e4 LT |
863 | } |
864 | ||
2e4e6a17 | 865 | oldinfo = xt_replace_table(t, tmp.num_counters, newinfo, &ret); |
1da177e4 LT |
866 | if (!oldinfo) |
867 | goto put_module; | |
868 | ||
869 | /* Update module usage count based on number of rules */ | |
870 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
871 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
872 | if ((oldinfo->number > oldinfo->initial_entries) || | |
873 | (newinfo->number <= oldinfo->initial_entries)) | |
874 | module_put(t->me); | |
875 | if ((oldinfo->number > oldinfo->initial_entries) && | |
876 | (newinfo->number <= oldinfo->initial_entries)) | |
877 | module_put(t->me); | |
878 | ||
879 | /* Get the old counters. */ | |
880 | get_counters(oldinfo, counters); | |
881 | /* Decrease module usage counts and free resource */ | |
31836064 ED |
882 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
883 | ARPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL); | |
884 | ||
2e4e6a17 | 885 | xt_free_table_info(oldinfo); |
1da177e4 | 886 | if (copy_to_user(tmp.counters, counters, |
2e4e6a17 | 887 | sizeof(struct xt_counters) * tmp.num_counters) != 0) |
1da177e4 LT |
888 | ret = -EFAULT; |
889 | vfree(counters); | |
2e4e6a17 | 890 | xt_table_unlock(t); |
1da177e4 LT |
891 | return ret; |
892 | ||
893 | put_module: | |
894 | module_put(t->me); | |
2e4e6a17 | 895 | xt_table_unlock(t); |
1da177e4 | 896 | free_newinfo_counters_untrans: |
31836064 | 897 | ARPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
1da177e4 LT |
898 | free_newinfo_counters: |
899 | vfree(counters); | |
900 | free_newinfo: | |
2e4e6a17 | 901 | xt_free_table_info(newinfo); |
1da177e4 LT |
902 | return ret; |
903 | } | |
904 | ||
905 | /* We're lazy, and add to the first CPU; overflow works its fey magic | |
906 | * and everything is OK. | |
907 | */ | |
908 | static inline int add_counter_to_entry(struct arpt_entry *e, | |
2e4e6a17 | 909 | const struct xt_counters addme[], |
1da177e4 LT |
910 | unsigned int *i) |
911 | { | |
912 | ||
913 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
914 | ||
915 | (*i)++; | |
916 | return 0; | |
917 | } | |
918 | ||
919 | static int do_add_counters(void __user *user, unsigned int len) | |
920 | { | |
921 | unsigned int i; | |
2e4e6a17 | 922 | struct xt_counters_info tmp, *paddc; |
1da177e4 | 923 | struct arpt_table *t; |
2e4e6a17 | 924 | struct xt_table_info *private; |
6b7d31fc | 925 | int ret = 0; |
31836064 | 926 | void *loc_cpu_entry; |
1da177e4 LT |
927 | |
928 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
929 | return -EFAULT; | |
930 | ||
2e4e6a17 | 931 | if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct xt_counters)) |
1da177e4 LT |
932 | return -EINVAL; |
933 | ||
934 | paddc = vmalloc(len); | |
935 | if (!paddc) | |
936 | return -ENOMEM; | |
937 | ||
938 | if (copy_from_user(paddc, user, len) != 0) { | |
939 | ret = -EFAULT; | |
940 | goto free; | |
941 | } | |
942 | ||
2e4e6a17 | 943 | t = xt_find_table_lock(NF_ARP, tmp.name); |
6b7d31fc HW |
944 | if (!t || IS_ERR(t)) { |
945 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 946 | goto free; |
6b7d31fc | 947 | } |
1da177e4 LT |
948 | |
949 | write_lock_bh(&t->lock); | |
2e4e6a17 | 950 | private = t->private; |
2c8ac66b | 951 | if (private->number != tmp.num_counters) { |
1da177e4 LT |
952 | ret = -EINVAL; |
953 | goto unlock_up_free; | |
954 | } | |
955 | ||
956 | i = 0; | |
31836064 | 957 | /* Choose the copy that is on our node */ |
2e4e6a17 | 958 | loc_cpu_entry = private->entries[smp_processor_id()]; |
31836064 | 959 | ARPT_ENTRY_ITERATE(loc_cpu_entry, |
2e4e6a17 | 960 | private->size, |
1da177e4 LT |
961 | add_counter_to_entry, |
962 | paddc->counters, | |
963 | &i); | |
964 | unlock_up_free: | |
965 | write_unlock_bh(&t->lock); | |
2e4e6a17 | 966 | xt_table_unlock(t); |
6b7d31fc | 967 | module_put(t->me); |
1da177e4 LT |
968 | free: |
969 | vfree(paddc); | |
970 | ||
971 | return ret; | |
972 | } | |
973 | ||
974 | static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
975 | { | |
976 | int ret; | |
977 | ||
978 | if (!capable(CAP_NET_ADMIN)) | |
979 | return -EPERM; | |
980 | ||
981 | switch (cmd) { | |
982 | case ARPT_SO_SET_REPLACE: | |
983 | ret = do_replace(user, len); | |
984 | break; | |
985 | ||
986 | case ARPT_SO_SET_ADD_COUNTERS: | |
987 | ret = do_add_counters(user, len); | |
988 | break; | |
989 | ||
990 | default: | |
991 | duprintf("do_arpt_set_ctl: unknown request %i\n", cmd); | |
992 | ret = -EINVAL; | |
993 | } | |
994 | ||
995 | return ret; | |
996 | } | |
997 | ||
998 | static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
999 | { | |
1000 | int ret; | |
1001 | ||
1002 | if (!capable(CAP_NET_ADMIN)) | |
1003 | return -EPERM; | |
1004 | ||
1005 | switch (cmd) { | |
1006 | case ARPT_SO_GET_INFO: { | |
1007 | char name[ARPT_TABLE_MAXNAMELEN]; | |
1008 | struct arpt_table *t; | |
1009 | ||
1010 | if (*len != sizeof(struct arpt_getinfo)) { | |
1011 | duprintf("length %u != %Zu\n", *len, | |
1012 | sizeof(struct arpt_getinfo)); | |
1013 | ret = -EINVAL; | |
1014 | break; | |
1015 | } | |
1016 | ||
1017 | if (copy_from_user(name, user, sizeof(name)) != 0) { | |
1018 | ret = -EFAULT; | |
1019 | break; | |
1020 | } | |
1021 | name[ARPT_TABLE_MAXNAMELEN-1] = '\0'; | |
6b7d31fc | 1022 | |
2e4e6a17 | 1023 | t = try_then_request_module(xt_find_table_lock(NF_ARP, name), |
6b7d31fc HW |
1024 | "arptable_%s", name); |
1025 | if (t && !IS_ERR(t)) { | |
1da177e4 | 1026 | struct arpt_getinfo info; |
2e4e6a17 | 1027 | struct xt_table_info *private = t->private; |
1da177e4 LT |
1028 | |
1029 | info.valid_hooks = t->valid_hooks; | |
2e4e6a17 | 1030 | memcpy(info.hook_entry, private->hook_entry, |
1da177e4 | 1031 | sizeof(info.hook_entry)); |
2e4e6a17 | 1032 | memcpy(info.underflow, private->underflow, |
1da177e4 | 1033 | sizeof(info.underflow)); |
2e4e6a17 HW |
1034 | info.num_entries = private->number; |
1035 | info.size = private->size; | |
1da177e4 LT |
1036 | strcpy(info.name, name); |
1037 | ||
1038 | if (copy_to_user(user, &info, *len) != 0) | |
1039 | ret = -EFAULT; | |
1040 | else | |
1041 | ret = 0; | |
2e4e6a17 | 1042 | xt_table_unlock(t); |
6b7d31fc HW |
1043 | module_put(t->me); |
1044 | } else | |
1045 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 LT |
1046 | } |
1047 | break; | |
1048 | ||
1049 | case ARPT_SO_GET_ENTRIES: { | |
1050 | struct arpt_get_entries get; | |
1051 | ||
1052 | if (*len < sizeof(get)) { | |
1053 | duprintf("get_entries: %u < %Zu\n", *len, sizeof(get)); | |
1054 | ret = -EINVAL; | |
1055 | } else if (copy_from_user(&get, user, sizeof(get)) != 0) { | |
1056 | ret = -EFAULT; | |
1057 | } else if (*len != sizeof(struct arpt_get_entries) + get.size) { | |
1058 | duprintf("get_entries: %u != %Zu\n", *len, | |
1059 | sizeof(struct arpt_get_entries) + get.size); | |
1060 | ret = -EINVAL; | |
1061 | } else | |
1062 | ret = get_entries(&get, user); | |
1063 | break; | |
1064 | } | |
1065 | ||
6b7d31fc | 1066 | case ARPT_SO_GET_REVISION_TARGET: { |
2e4e6a17 | 1067 | struct xt_get_revision rev; |
6b7d31fc HW |
1068 | |
1069 | if (*len != sizeof(rev)) { | |
1070 | ret = -EINVAL; | |
1071 | break; | |
1072 | } | |
1073 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1074 | ret = -EFAULT; | |
1075 | break; | |
1076 | } | |
1077 | ||
2e4e6a17 HW |
1078 | try_then_request_module(xt_find_revision(NF_ARP, rev.name, |
1079 | rev.revision, 1, &ret), | |
6b7d31fc HW |
1080 | "arpt_%s", rev.name); |
1081 | break; | |
1082 | } | |
1083 | ||
1da177e4 LT |
1084 | default: |
1085 | duprintf("do_arpt_get_ctl: unknown request %i\n", cmd); | |
1086 | ret = -EINVAL; | |
1087 | } | |
1088 | ||
1089 | return ret; | |
1090 | } | |
1091 | ||
1da177e4 LT |
1092 | int arpt_register_table(struct arpt_table *table, |
1093 | const struct arpt_replace *repl) | |
1094 | { | |
1095 | int ret; | |
2e4e6a17 HW |
1096 | struct xt_table_info *newinfo; |
1097 | static struct xt_table_info bootstrap | |
1da177e4 | 1098 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 1099 | void *loc_cpu_entry; |
1da177e4 | 1100 | |
2e4e6a17 | 1101 | newinfo = xt_alloc_table_info(repl->size); |
1da177e4 LT |
1102 | if (!newinfo) { |
1103 | ret = -ENOMEM; | |
1104 | return ret; | |
1105 | } | |
31836064 ED |
1106 | |
1107 | /* choose the copy on our node/cpu */ | |
1108 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1109 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
1110 | |
1111 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 1112 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
1113 | repl->num_entries, |
1114 | repl->hook_entry, | |
1115 | repl->underflow); | |
2e4e6a17 | 1116 | |
1da177e4 LT |
1117 | duprintf("arpt_register_table: translate table gives %d\n", ret); |
1118 | if (ret != 0) { | |
2e4e6a17 | 1119 | xt_free_table_info(newinfo); |
1da177e4 LT |
1120 | return ret; |
1121 | } | |
1122 | ||
da298d3a PM |
1123 | ret = xt_register_table(table, &bootstrap, newinfo); |
1124 | if (ret != 0) { | |
2e4e6a17 | 1125 | xt_free_table_info(newinfo); |
1da177e4 LT |
1126 | return ret; |
1127 | } | |
1128 | ||
2e4e6a17 | 1129 | return 0; |
1da177e4 LT |
1130 | } |
1131 | ||
1132 | void arpt_unregister_table(struct arpt_table *table) | |
1133 | { | |
2e4e6a17 | 1134 | struct xt_table_info *private; |
31836064 ED |
1135 | void *loc_cpu_entry; |
1136 | ||
2e4e6a17 | 1137 | private = xt_unregister_table(table); |
1da177e4 LT |
1138 | |
1139 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
1140 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
1141 | ARPT_ENTRY_ITERATE(loc_cpu_entry, private->size, | |
1da177e4 | 1142 | cleanup_entry, NULL); |
2e4e6a17 | 1143 | xt_free_table_info(private); |
1da177e4 LT |
1144 | } |
1145 | ||
1146 | /* The built-in targets: standard (NULL) and error. */ | |
1147 | static struct arpt_target arpt_standard_target = { | |
1148 | .name = ARPT_STANDARD_TARGET, | |
aa83c1ab | 1149 | .targetsize = sizeof(int), |
a45049c5 | 1150 | .family = NF_ARP, |
1da177e4 LT |
1151 | }; |
1152 | ||
1153 | static struct arpt_target arpt_error_target = { | |
1154 | .name = ARPT_ERROR_TARGET, | |
1155 | .target = arpt_error, | |
aa83c1ab | 1156 | .targetsize = ARPT_FUNCTION_MAXNAMELEN, |
a45049c5 | 1157 | .family = NF_ARP, |
1da177e4 LT |
1158 | }; |
1159 | ||
1160 | static struct nf_sockopt_ops arpt_sockopts = { | |
1161 | .pf = PF_INET, | |
1162 | .set_optmin = ARPT_BASE_CTL, | |
1163 | .set_optmax = ARPT_SO_SET_MAX+1, | |
1164 | .set = do_arpt_set_ctl, | |
1165 | .get_optmin = ARPT_BASE_CTL, | |
1166 | .get_optmax = ARPT_SO_GET_MAX+1, | |
1167 | .get = do_arpt_get_ctl, | |
1168 | }; | |
1169 | ||
65b4b4e8 | 1170 | static int __init arp_tables_init(void) |
1da177e4 LT |
1171 | { |
1172 | int ret; | |
1173 | ||
0eff66e6 PM |
1174 | ret = xt_proto_init(NF_ARP); |
1175 | if (ret < 0) | |
1176 | goto err1; | |
2e4e6a17 | 1177 | |
1da177e4 | 1178 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
1179 | ret = xt_register_target(&arpt_standard_target); |
1180 | if (ret < 0) | |
1181 | goto err2; | |
1182 | ret = xt_register_target(&arpt_error_target); | |
1183 | if (ret < 0) | |
1184 | goto err3; | |
1da177e4 LT |
1185 | |
1186 | /* Register setsockopt */ | |
1187 | ret = nf_register_sockopt(&arpt_sockopts); | |
0eff66e6 PM |
1188 | if (ret < 0) |
1189 | goto err4; | |
1da177e4 | 1190 | |
1da177e4 LT |
1191 | printk("arp_tables: (C) 2002 David S. Miller\n"); |
1192 | return 0; | |
0eff66e6 PM |
1193 | |
1194 | err4: | |
1195 | xt_unregister_target(&arpt_error_target); | |
1196 | err3: | |
1197 | xt_unregister_target(&arpt_standard_target); | |
1198 | err2: | |
1199 | xt_proto_fini(NF_ARP); | |
1200 | err1: | |
1201 | return ret; | |
1da177e4 LT |
1202 | } |
1203 | ||
65b4b4e8 | 1204 | static void __exit arp_tables_fini(void) |
1da177e4 LT |
1205 | { |
1206 | nf_unregister_sockopt(&arpt_sockopts); | |
2e4e6a17 | 1207 | xt_proto_fini(NF_ARP); |
1da177e4 LT |
1208 | } |
1209 | ||
1210 | EXPORT_SYMBOL(arpt_register_table); | |
1211 | EXPORT_SYMBOL(arpt_unregister_table); | |
1212 | EXPORT_SYMBOL(arpt_do_table); | |
1da177e4 | 1213 | |
65b4b4e8 AM |
1214 | module_init(arp_tables_init); |
1215 | module_exit(arp_tables_fini); |