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 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
4fc268d2 | 16 | #include <linux/capability.h> |
1da177e4 LT |
17 | #include <linux/if_arp.h> |
18 | #include <linux/kmod.h> | |
19 | #include <linux/vmalloc.h> | |
20 | #include <linux/proc_fs.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/init.h> | |
23 | ||
24 | #include <asm/uaccess.h> | |
25 | #include <asm/semaphore.h> | |
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 | #include <linux/netfilter_ipv4/listhelp.h> |
61 | ||
1da177e4 LT |
62 | static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap, |
63 | char *hdr_addr, int len) | |
64 | { | |
65 | int i, ret; | |
66 | ||
67 | if (len > ARPT_DEV_ADDR_LEN_MAX) | |
68 | len = ARPT_DEV_ADDR_LEN_MAX; | |
69 | ||
70 | ret = 0; | |
71 | for (i = 0; i < len; i++) | |
72 | ret |= (hdr_addr[i] ^ ap->addr[i]) & ap->mask[i]; | |
73 | ||
74 | return (ret != 0); | |
75 | } | |
76 | ||
77 | /* Returns whether packet matches rule or not. */ | |
78 | static inline int arp_packet_match(const struct arphdr *arphdr, | |
79 | struct net_device *dev, | |
80 | const char *indev, | |
81 | const char *outdev, | |
82 | const struct arpt_arp *arpinfo) | |
83 | { | |
84 | char *arpptr = (char *)(arphdr + 1); | |
85 | char *src_devaddr, *tgt_devaddr; | |
86 | u32 src_ipaddr, tgt_ipaddr; | |
87 | int i, ret; | |
88 | ||
89 | #define FWINV(bool,invflg) ((bool) ^ !!(arpinfo->invflags & invflg)) | |
90 | ||
91 | if (FWINV((arphdr->ar_op & arpinfo->arpop_mask) != arpinfo->arpop, | |
92 | ARPT_INV_ARPOP)) { | |
93 | dprintf("ARP operation field mismatch.\n"); | |
94 | dprintf("ar_op: %04x info->arpop: %04x info->arpop_mask: %04x\n", | |
95 | arphdr->ar_op, arpinfo->arpop, arpinfo->arpop_mask); | |
96 | return 0; | |
97 | } | |
98 | ||
99 | if (FWINV((arphdr->ar_hrd & arpinfo->arhrd_mask) != arpinfo->arhrd, | |
100 | ARPT_INV_ARPHRD)) { | |
101 | dprintf("ARP hardware address format mismatch.\n"); | |
102 | dprintf("ar_hrd: %04x info->arhrd: %04x info->arhrd_mask: %04x\n", | |
103 | arphdr->ar_hrd, arpinfo->arhrd, arpinfo->arhrd_mask); | |
104 | return 0; | |
105 | } | |
106 | ||
107 | if (FWINV((arphdr->ar_pro & arpinfo->arpro_mask) != arpinfo->arpro, | |
108 | ARPT_INV_ARPPRO)) { | |
109 | dprintf("ARP protocol address format mismatch.\n"); | |
110 | dprintf("ar_pro: %04x info->arpro: %04x info->arpro_mask: %04x\n", | |
111 | arphdr->ar_pro, arpinfo->arpro, arpinfo->arpro_mask); | |
112 | return 0; | |
113 | } | |
114 | ||
115 | if (FWINV((arphdr->ar_hln & arpinfo->arhln_mask) != arpinfo->arhln, | |
116 | ARPT_INV_ARPHLN)) { | |
117 | dprintf("ARP hardware address length mismatch.\n"); | |
118 | dprintf("ar_hln: %02x info->arhln: %02x info->arhln_mask: %02x\n", | |
119 | arphdr->ar_hln, arpinfo->arhln, arpinfo->arhln_mask); | |
120 | return 0; | |
121 | } | |
122 | ||
123 | src_devaddr = arpptr; | |
124 | arpptr += dev->addr_len; | |
125 | memcpy(&src_ipaddr, arpptr, sizeof(u32)); | |
126 | arpptr += sizeof(u32); | |
127 | tgt_devaddr = arpptr; | |
128 | arpptr += dev->addr_len; | |
129 | memcpy(&tgt_ipaddr, arpptr, sizeof(u32)); | |
130 | ||
131 | if (FWINV(arp_devaddr_compare(&arpinfo->src_devaddr, src_devaddr, dev->addr_len), | |
132 | ARPT_INV_SRCDEVADDR) || | |
133 | FWINV(arp_devaddr_compare(&arpinfo->tgt_devaddr, tgt_devaddr, dev->addr_len), | |
134 | ARPT_INV_TGTDEVADDR)) { | |
135 | dprintf("Source or target device address mismatch.\n"); | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | if (FWINV((src_ipaddr & arpinfo->smsk.s_addr) != arpinfo->src.s_addr, | |
141 | ARPT_INV_SRCIP) || | |
142 | FWINV(((tgt_ipaddr & arpinfo->tmsk.s_addr) != arpinfo->tgt.s_addr), | |
143 | ARPT_INV_TGTIP)) { | |
144 | dprintf("Source or target IP address mismatch.\n"); | |
145 | ||
146 | dprintf("SRC: %u.%u.%u.%u. Mask: %u.%u.%u.%u. Target: %u.%u.%u.%u.%s\n", | |
147 | NIPQUAD(src_ipaddr), | |
148 | NIPQUAD(arpinfo->smsk.s_addr), | |
149 | NIPQUAD(arpinfo->src.s_addr), | |
150 | arpinfo->invflags & ARPT_INV_SRCIP ? " (INV)" : ""); | |
151 | dprintf("TGT: %u.%u.%u.%u Mask: %u.%u.%u.%u Target: %u.%u.%u.%u.%s\n", | |
152 | NIPQUAD(tgt_ipaddr), | |
153 | NIPQUAD(arpinfo->tmsk.s_addr), | |
154 | NIPQUAD(arpinfo->tgt.s_addr), | |
155 | arpinfo->invflags & ARPT_INV_TGTIP ? " (INV)" : ""); | |
156 | return 0; | |
157 | } | |
158 | ||
159 | /* Look for ifname matches. */ | |
160 | for (i = 0, ret = 0; i < IFNAMSIZ; i++) { | |
161 | ret |= (indev[i] ^ arpinfo->iniface[i]) | |
162 | & arpinfo->iniface_mask[i]; | |
163 | } | |
164 | ||
165 | if (FWINV(ret != 0, ARPT_INV_VIA_IN)) { | |
166 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
167 | indev, arpinfo->iniface, | |
168 | arpinfo->invflags&ARPT_INV_VIA_IN ?" (INV)":""); | |
169 | return 0; | |
170 | } | |
171 | ||
172 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { | |
173 | unsigned long odev; | |
174 | memcpy(&odev, outdev + i*sizeof(unsigned long), | |
175 | sizeof(unsigned long)); | |
176 | ret |= (odev | |
177 | ^ ((const unsigned long *)arpinfo->outiface)[i]) | |
178 | & ((const unsigned long *)arpinfo->outiface_mask)[i]; | |
179 | } | |
180 | ||
181 | if (FWINV(ret != 0, ARPT_INV_VIA_OUT)) { | |
182 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
183 | outdev, arpinfo->outiface, | |
184 | arpinfo->invflags&ARPT_INV_VIA_OUT ?" (INV)":""); | |
185 | return 0; | |
186 | } | |
187 | ||
188 | return 1; | |
189 | } | |
190 | ||
191 | static inline int arp_checkentry(const struct arpt_arp *arp) | |
192 | { | |
193 | if (arp->flags & ~ARPT_F_MASK) { | |
194 | duprintf("Unknown flag bits set: %08X\n", | |
195 | arp->flags & ~ARPT_F_MASK); | |
196 | return 0; | |
197 | } | |
198 | if (arp->invflags & ~ARPT_INV_MASK) { | |
199 | duprintf("Unknown invflag bits set: %08X\n", | |
200 | arp->invflags & ~ARPT_INV_MASK); | |
201 | return 0; | |
202 | } | |
203 | ||
204 | return 1; | |
205 | } | |
206 | ||
207 | static unsigned int arpt_error(struct sk_buff **pskb, | |
1da177e4 LT |
208 | const struct net_device *in, |
209 | const struct net_device *out, | |
2e4e6a17 | 210 | unsigned int hooknum, |
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; | |
2e4e6a17 | 239 | struct xt_table_info *private = table->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); | |
2e4e6a17 HW |
251 | table_base = (void *)private->entries[smp_processor_id()]; |
252 | e = get_entry(table_base, private->hook_entry[hook]); | |
253 | back = get_entry(table_base, private->underflow[hook]); | |
1da177e4 LT |
254 | |
255 | arp = (*pskb)->nh.arph; | |
256 | do { | |
257 | if (arp_packet_match(arp, (*pskb)->dev, indev, outdev, &e->arp)) { | |
258 | struct arpt_entry_target *t; | |
259 | int hdr_len; | |
260 | ||
261 | hdr_len = sizeof(*arp) + (2 * sizeof(struct in_addr)) + | |
262 | (2 * (*pskb)->dev->addr_len); | |
263 | ADD_COUNTER(e->counters, hdr_len, 1); | |
264 | ||
265 | t = arpt_get_target(e); | |
266 | ||
267 | /* Standard target? */ | |
268 | if (!t->u.kernel.target->target) { | |
269 | int v; | |
270 | ||
271 | v = ((struct arpt_standard_target *)t)->verdict; | |
272 | if (v < 0) { | |
273 | /* Pop from stack? */ | |
274 | if (v != ARPT_RETURN) { | |
275 | verdict = (unsigned)(-v) - 1; | |
276 | break; | |
277 | } | |
278 | e = back; | |
279 | back = get_entry(table_base, | |
280 | back->comefrom); | |
281 | continue; | |
282 | } | |
283 | if (table_base + v | |
284 | != (void *)e + e->next_offset) { | |
285 | /* Save old back ptr in next entry */ | |
286 | struct arpt_entry *next | |
287 | = (void *)e + e->next_offset; | |
288 | next->comefrom = | |
289 | (void *)back - table_base; | |
290 | ||
291 | /* set back pointer to next entry */ | |
292 | back = next; | |
293 | } | |
294 | ||
295 | e = get_entry(table_base, v); | |
296 | } else { | |
297 | /* Targets which reenter must return | |
298 | * abs. verdicts | |
299 | */ | |
300 | verdict = t->u.kernel.target->target(pskb, | |
1da177e4 | 301 | in, out, |
2e4e6a17 | 302 | hook, |
1c524830 | 303 | t->u.kernel.target, |
1da177e4 LT |
304 | t->data, |
305 | userdata); | |
306 | ||
307 | /* Target might have changed stuff. */ | |
308 | arp = (*pskb)->nh.arph; | |
309 | ||
310 | if (verdict == ARPT_CONTINUE) | |
311 | e = (void *)e + e->next_offset; | |
312 | else | |
313 | /* Verdict */ | |
314 | break; | |
315 | } | |
316 | } else { | |
317 | e = (void *)e + e->next_offset; | |
318 | } | |
319 | } while (!hotdrop); | |
320 | read_unlock_bh(&table->lock); | |
321 | ||
322 | if (hotdrop) | |
323 | return NF_DROP; | |
324 | else | |
325 | return verdict; | |
326 | } | |
327 | ||
1da177e4 LT |
328 | /* All zeroes == unconditional rule. */ |
329 | static inline int unconditional(const struct arpt_arp *arp) | |
330 | { | |
331 | unsigned int i; | |
332 | ||
333 | for (i = 0; i < sizeof(*arp)/sizeof(__u32); i++) | |
334 | if (((__u32 *)arp)[i]) | |
335 | return 0; | |
336 | ||
337 | return 1; | |
338 | } | |
339 | ||
340 | /* Figures out from what hook each rule can be called: returns 0 if | |
341 | * there are loops. Puts hook bitmask in comefrom. | |
342 | */ | |
2e4e6a17 | 343 | static int mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 344 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
345 | { |
346 | unsigned int hook; | |
347 | ||
348 | /* No recursion; use packet counter to save back ptrs (reset | |
349 | * to 0 as we leave), and comefrom to save source hook bitmask. | |
350 | */ | |
351 | for (hook = 0; hook < NF_ARP_NUMHOOKS; hook++) { | |
352 | unsigned int pos = newinfo->hook_entry[hook]; | |
353 | struct arpt_entry *e | |
31836064 | 354 | = (struct arpt_entry *)(entry0 + pos); |
1da177e4 LT |
355 | |
356 | if (!(valid_hooks & (1 << hook))) | |
357 | continue; | |
358 | ||
359 | /* Set initial back pointer. */ | |
360 | e->counters.pcnt = pos; | |
361 | ||
362 | for (;;) { | |
363 | struct arpt_standard_target *t | |
364 | = (void *)arpt_get_target(e); | |
365 | ||
366 | if (e->comefrom & (1 << NF_ARP_NUMHOOKS)) { | |
367 | printk("arptables: loop hook %u pos %u %08X.\n", | |
368 | hook, pos, e->comefrom); | |
369 | return 0; | |
370 | } | |
371 | e->comefrom | |
372 | |= ((1 << hook) | (1 << NF_ARP_NUMHOOKS)); | |
373 | ||
374 | /* Unconditional return/END. */ | |
375 | if (e->target_offset == sizeof(struct arpt_entry) | |
376 | && (strcmp(t->target.u.user.name, | |
377 | ARPT_STANDARD_TARGET) == 0) | |
378 | && t->verdict < 0 | |
379 | && unconditional(&e->arp)) { | |
380 | unsigned int oldpos, size; | |
381 | ||
382 | /* Return: backtrack through the last | |
383 | * big jump. | |
384 | */ | |
385 | do { | |
386 | e->comefrom ^= (1<<NF_ARP_NUMHOOKS); | |
387 | oldpos = pos; | |
388 | pos = e->counters.pcnt; | |
389 | e->counters.pcnt = 0; | |
390 | ||
391 | /* We're at the start. */ | |
392 | if (pos == oldpos) | |
393 | goto next; | |
394 | ||
395 | e = (struct arpt_entry *) | |
31836064 | 396 | (entry0 + pos); |
1da177e4 LT |
397 | } while (oldpos == pos + e->next_offset); |
398 | ||
399 | /* Move along one */ | |
400 | size = e->next_offset; | |
401 | e = (struct arpt_entry *) | |
31836064 | 402 | (entry0 + pos + size); |
1da177e4 LT |
403 | e->counters.pcnt = pos; |
404 | pos += size; | |
405 | } else { | |
406 | int newpos = t->verdict; | |
407 | ||
408 | if (strcmp(t->target.u.user.name, | |
409 | ARPT_STANDARD_TARGET) == 0 | |
410 | && newpos >= 0) { | |
411 | /* This a jump; chase it. */ | |
412 | duprintf("Jump rule %u -> %u\n", | |
413 | pos, newpos); | |
414 | } else { | |
415 | /* ... this is a fallthru */ | |
416 | newpos = pos + e->next_offset; | |
417 | } | |
418 | e = (struct arpt_entry *) | |
31836064 | 419 | (entry0 + newpos); |
1da177e4 LT |
420 | e->counters.pcnt = pos; |
421 | pos = newpos; | |
422 | } | |
423 | } | |
424 | next: | |
425 | duprintf("Finished chain %u\n", hook); | |
426 | } | |
427 | return 1; | |
428 | } | |
429 | ||
430 | static inline int standard_check(const struct arpt_entry_target *t, | |
431 | unsigned int max_offset) | |
432 | { | |
433 | struct arpt_standard_target *targ = (void *)t; | |
434 | ||
435 | /* Check standard info. */ | |
436 | if (t->u.target_size | |
437 | != ARPT_ALIGN(sizeof(struct arpt_standard_target))) { | |
438 | duprintf("arpt_standard_check: target size %u != %Zu\n", | |
439 | t->u.target_size, | |
440 | ARPT_ALIGN(sizeof(struct arpt_standard_target))); | |
441 | return 0; | |
442 | } | |
443 | ||
444 | if (targ->verdict >= 0 | |
445 | && targ->verdict > max_offset - sizeof(struct arpt_entry)) { | |
446 | duprintf("arpt_standard_check: bad verdict (%i)\n", | |
447 | targ->verdict); | |
448 | return 0; | |
449 | } | |
450 | ||
451 | if (targ->verdict < -NF_MAX_VERDICT - 1) { | |
452 | duprintf("arpt_standard_check: bad negative verdict (%i)\n", | |
453 | targ->verdict); | |
454 | return 0; | |
455 | } | |
456 | return 1; | |
457 | } | |
458 | ||
459 | static struct arpt_target arpt_standard_target; | |
460 | ||
461 | static inline int check_entry(struct arpt_entry *e, const char *name, unsigned int size, | |
462 | unsigned int *i) | |
463 | { | |
464 | struct arpt_entry_target *t; | |
465 | struct arpt_target *target; | |
466 | int ret; | |
467 | ||
468 | if (!arp_checkentry(&e->arp)) { | |
469 | duprintf("arp_tables: arp check failed %p %s.\n", e, name); | |
470 | return -EINVAL; | |
471 | } | |
472 | ||
473 | t = arpt_get_target(e); | |
2e4e6a17 HW |
474 | target = try_then_request_module(xt_find_target(NF_ARP, t->u.user.name, |
475 | t->u.user.revision), | |
6b7d31fc HW |
476 | "arpt_%s", t->u.user.name); |
477 | if (IS_ERR(target) || !target) { | |
1da177e4 | 478 | duprintf("check_entry: `%s' not found\n", t->u.user.name); |
6b7d31fc | 479 | ret = target ? PTR_ERR(target) : -ENOENT; |
1da177e4 LT |
480 | goto out; |
481 | } | |
1da177e4 | 482 | t->u.kernel.target = target; |
1da177e4 | 483 | |
3cdc7c95 PM |
484 | ret = xt_check_target(target, NF_ARP, t->u.target_size - sizeof(*t), |
485 | name, e->comefrom, 0, 0); | |
486 | if (ret) | |
487 | goto err; | |
488 | ||
1da177e4 LT |
489 | if (t->u.kernel.target == &arpt_standard_target) { |
490 | if (!standard_check(t, size)) { | |
491 | ret = -EINVAL; | |
492 | goto out; | |
493 | } | |
494 | } else if (t->u.kernel.target->checkentry | |
1c524830 | 495 | && !t->u.kernel.target->checkentry(name, e, target, t->data, |
1da177e4 LT |
496 | t->u.target_size |
497 | - sizeof(*t), | |
498 | e->comefrom)) { | |
1da177e4 LT |
499 | duprintf("arp_tables: check failed for `%s'.\n", |
500 | t->u.kernel.target->name); | |
501 | ret = -EINVAL; | |
3cdc7c95 | 502 | goto err; |
1da177e4 LT |
503 | } |
504 | ||
505 | (*i)++; | |
506 | return 0; | |
3cdc7c95 PM |
507 | err: |
508 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
509 | out: |
510 | return ret; | |
511 | } | |
512 | ||
513 | static inline int check_entry_size_and_hooks(struct arpt_entry *e, | |
2e4e6a17 | 514 | struct xt_table_info *newinfo, |
1da177e4 LT |
515 | unsigned char *base, |
516 | unsigned char *limit, | |
517 | const unsigned int *hook_entries, | |
518 | const unsigned int *underflows, | |
519 | unsigned int *i) | |
520 | { | |
521 | unsigned int h; | |
522 | ||
523 | if ((unsigned long)e % __alignof__(struct arpt_entry) != 0 | |
524 | || (unsigned char *)e + sizeof(struct arpt_entry) >= limit) { | |
525 | duprintf("Bad offset %p\n", e); | |
526 | return -EINVAL; | |
527 | } | |
528 | ||
529 | if (e->next_offset | |
530 | < sizeof(struct arpt_entry) + sizeof(struct arpt_entry_target)) { | |
531 | duprintf("checking: element %p size %u\n", | |
532 | e, e->next_offset); | |
533 | return -EINVAL; | |
534 | } | |
535 | ||
536 | /* Check hooks & underflows */ | |
537 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { | |
538 | if ((unsigned char *)e - base == hook_entries[h]) | |
539 | newinfo->hook_entry[h] = hook_entries[h]; | |
540 | if ((unsigned char *)e - base == underflows[h]) | |
541 | newinfo->underflow[h] = underflows[h]; | |
542 | } | |
543 | ||
544 | /* FIXME: underflows must be unconditional, standard verdicts | |
545 | < 0 (not ARPT_RETURN). --RR */ | |
546 | ||
547 | /* Clear counters and comefrom */ | |
2e4e6a17 | 548 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
549 | e->comefrom = 0; |
550 | ||
551 | (*i)++; | |
552 | return 0; | |
553 | } | |
554 | ||
555 | static inline int cleanup_entry(struct arpt_entry *e, unsigned int *i) | |
556 | { | |
557 | struct arpt_entry_target *t; | |
558 | ||
559 | if (i && (*i)-- == 0) | |
560 | return 1; | |
561 | ||
562 | t = arpt_get_target(e); | |
563 | if (t->u.kernel.target->destroy) | |
1c524830 | 564 | t->u.kernel.target->destroy(t->u.kernel.target, t->data, |
1da177e4 LT |
565 | t->u.target_size - sizeof(*t)); |
566 | module_put(t->u.kernel.target->me); | |
567 | return 0; | |
568 | } | |
569 | ||
570 | /* Checks and translates the user-supplied table segment (held in | |
571 | * newinfo). | |
572 | */ | |
573 | static int translate_table(const char *name, | |
574 | unsigned int valid_hooks, | |
2e4e6a17 | 575 | struct xt_table_info *newinfo, |
31836064 | 576 | void *entry0, |
1da177e4 LT |
577 | unsigned int size, |
578 | unsigned int number, | |
579 | const unsigned int *hook_entries, | |
580 | const unsigned int *underflows) | |
581 | { | |
582 | unsigned int i; | |
583 | int ret; | |
584 | ||
585 | newinfo->size = size; | |
586 | newinfo->number = number; | |
587 | ||
588 | /* Init all hooks to impossible value. */ | |
589 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
590 | newinfo->hook_entry[i] = 0xFFFFFFFF; | |
591 | newinfo->underflow[i] = 0xFFFFFFFF; | |
592 | } | |
593 | ||
594 | duprintf("translate_table: size %u\n", newinfo->size); | |
595 | i = 0; | |
596 | ||
597 | /* Walk through entries, checking offsets. */ | |
31836064 | 598 | ret = ARPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
599 | check_entry_size_and_hooks, |
600 | newinfo, | |
31836064 ED |
601 | entry0, |
602 | entry0 + size, | |
1da177e4 LT |
603 | hook_entries, underflows, &i); |
604 | duprintf("translate_table: ARPT_ENTRY_ITERATE gives %d\n", ret); | |
605 | if (ret != 0) | |
606 | return ret; | |
607 | ||
608 | if (i != number) { | |
609 | duprintf("translate_table: %u not %u entries\n", | |
610 | i, number); | |
611 | return -EINVAL; | |
612 | } | |
613 | ||
614 | /* Check hooks all assigned */ | |
615 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
616 | /* Only hooks which are valid */ | |
617 | if (!(valid_hooks & (1 << i))) | |
618 | continue; | |
619 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
620 | duprintf("Invalid hook entry %u %u\n", | |
621 | i, hook_entries[i]); | |
622 | return -EINVAL; | |
623 | } | |
624 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
625 | duprintf("Invalid underflow %u %u\n", | |
626 | i, underflows[i]); | |
627 | return -EINVAL; | |
628 | } | |
629 | } | |
630 | ||
31836064 | 631 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) { |
1da177e4 LT |
632 | duprintf("Looping hook\n"); |
633 | return -ELOOP; | |
634 | } | |
635 | ||
636 | /* Finally, each sanity check must pass */ | |
637 | i = 0; | |
31836064 | 638 | ret = ARPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
639 | check_entry, name, size, &i); |
640 | ||
641 | if (ret != 0) { | |
31836064 | 642 | ARPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
643 | cleanup_entry, &i); |
644 | return ret; | |
645 | } | |
646 | ||
647 | /* And one copy for every other CPU */ | |
c8923c6b | 648 | for_each_cpu(i) { |
31836064 ED |
649 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
650 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
651 | } |
652 | ||
653 | return ret; | |
654 | } | |
655 | ||
1da177e4 LT |
656 | /* Gets counters. */ |
657 | static inline int add_entry_to_counter(const struct arpt_entry *e, | |
2e4e6a17 | 658 | struct xt_counters total[], |
1da177e4 LT |
659 | unsigned int *i) |
660 | { | |
661 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
662 | ||
663 | (*i)++; | |
664 | return 0; | |
665 | } | |
666 | ||
31836064 | 667 | static inline int set_entry_to_counter(const struct arpt_entry *e, |
2e4e6a17 | 668 | struct xt_counters total[], |
31836064 ED |
669 | unsigned int *i) |
670 | { | |
671 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
672 | ||
673 | (*i)++; | |
674 | return 0; | |
675 | } | |
676 | ||
2e4e6a17 HW |
677 | static void get_counters(const struct xt_table_info *t, |
678 | struct xt_counters counters[]) | |
1da177e4 LT |
679 | { |
680 | unsigned int cpu; | |
681 | unsigned int i; | |
31836064 ED |
682 | unsigned int curcpu; |
683 | ||
684 | /* Instead of clearing (by a previous call to memset()) | |
685 | * the counters and using adds, we set the counters | |
686 | * with data used by 'current' CPU | |
687 | * We dont care about preemption here. | |
688 | */ | |
689 | curcpu = raw_smp_processor_id(); | |
690 | ||
691 | i = 0; | |
692 | ARPT_ENTRY_ITERATE(t->entries[curcpu], | |
693 | t->size, | |
694 | set_entry_to_counter, | |
695 | counters, | |
696 | &i); | |
1da177e4 | 697 | |
c8923c6b | 698 | for_each_cpu(cpu) { |
31836064 ED |
699 | if (cpu == curcpu) |
700 | continue; | |
1da177e4 | 701 | i = 0; |
31836064 | 702 | ARPT_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
703 | t->size, |
704 | add_entry_to_counter, | |
705 | counters, | |
706 | &i); | |
707 | } | |
708 | } | |
709 | ||
710 | static int copy_entries_to_user(unsigned int total_size, | |
711 | struct arpt_table *table, | |
712 | void __user *userptr) | |
713 | { | |
714 | unsigned int off, num, countersize; | |
715 | struct arpt_entry *e; | |
2e4e6a17 HW |
716 | struct xt_counters *counters; |
717 | struct xt_table_info *private = table->private; | |
1da177e4 | 718 | int ret = 0; |
31836064 | 719 | void *loc_cpu_entry; |
1da177e4 LT |
720 | |
721 | /* We need atomic snapshot of counters: rest doesn't change | |
722 | * (other than comefrom, which userspace doesn't care | |
723 | * about). | |
724 | */ | |
2e4e6a17 HW |
725 | countersize = sizeof(struct xt_counters) * private->number; |
726 | counters = vmalloc_node(countersize, numa_node_id()); | |
1da177e4 LT |
727 | |
728 | if (counters == NULL) | |
729 | return -ENOMEM; | |
730 | ||
731 | /* First, sum counters... */ | |
1da177e4 | 732 | write_lock_bh(&table->lock); |
2e4e6a17 | 733 | get_counters(private, counters); |
1da177e4 LT |
734 | write_unlock_bh(&table->lock); |
735 | ||
2e4e6a17 | 736 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 ED |
737 | /* ... then copy entire thing ... */ |
738 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { | |
1da177e4 LT |
739 | ret = -EFAULT; |
740 | goto free_counters; | |
741 | } | |
742 | ||
743 | /* FIXME: use iterator macros --RR */ | |
744 | /* ... then go back and fix counters and names */ | |
745 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
746 | struct arpt_entry_target *t; | |
747 | ||
31836064 | 748 | e = (struct arpt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
749 | if (copy_to_user(userptr + off |
750 | + offsetof(struct arpt_entry, counters), | |
751 | &counters[num], | |
752 | sizeof(counters[num])) != 0) { | |
753 | ret = -EFAULT; | |
754 | goto free_counters; | |
755 | } | |
756 | ||
757 | t = arpt_get_target(e); | |
758 | if (copy_to_user(userptr + off + e->target_offset | |
759 | + offsetof(struct arpt_entry_target, | |
760 | u.user.name), | |
761 | t->u.kernel.target->name, | |
762 | strlen(t->u.kernel.target->name)+1) != 0) { | |
763 | ret = -EFAULT; | |
764 | goto free_counters; | |
765 | } | |
766 | } | |
767 | ||
768 | free_counters: | |
769 | vfree(counters); | |
770 | return ret; | |
771 | } | |
772 | ||
773 | static int get_entries(const struct arpt_get_entries *entries, | |
774 | struct arpt_get_entries __user *uptr) | |
775 | { | |
776 | int ret; | |
777 | struct arpt_table *t; | |
778 | ||
2e4e6a17 | 779 | t = xt_find_table_lock(NF_ARP, entries->name); |
31fe4d33 | 780 | if (t && !IS_ERR(t)) { |
2e4e6a17 | 781 | struct xt_table_info *private = t->private; |
1da177e4 | 782 | duprintf("t->private->number = %u\n", |
2e4e6a17 HW |
783 | private->number); |
784 | if (entries->size == private->size) | |
785 | ret = copy_entries_to_user(private->size, | |
1da177e4 LT |
786 | t, uptr->entrytable); |
787 | else { | |
788 | duprintf("get_entries: I've got %u not %u!\n", | |
2e4e6a17 | 789 | private->size, entries->size); |
1da177e4 LT |
790 | ret = -EINVAL; |
791 | } | |
6b7d31fc | 792 | module_put(t->me); |
2e4e6a17 | 793 | xt_table_unlock(t); |
1da177e4 | 794 | } else |
6b7d31fc | 795 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
796 | |
797 | return ret; | |
798 | } | |
799 | ||
800 | static int do_replace(void __user *user, unsigned int len) | |
801 | { | |
802 | int ret; | |
803 | struct arpt_replace tmp; | |
804 | struct arpt_table *t; | |
2e4e6a17 HW |
805 | struct xt_table_info *newinfo, *oldinfo; |
806 | struct xt_counters *counters; | |
31836064 | 807 | void *loc_cpu_entry, *loc_cpu_old_entry; |
1da177e4 LT |
808 | |
809 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
810 | return -EFAULT; | |
811 | ||
812 | /* Hack: Causes ipchains to give correct error msg --RR */ | |
813 | if (len != sizeof(tmp) + tmp.size) | |
814 | return -ENOPROTOOPT; | |
815 | ||
ee4bb818 KK |
816 | /* overflow check */ |
817 | if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS - | |
818 | SMP_CACHE_BYTES) | |
819 | return -ENOMEM; | |
820 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
821 | return -ENOMEM; | |
822 | ||
2e4e6a17 | 823 | newinfo = xt_alloc_table_info(tmp.size); |
1da177e4 LT |
824 | if (!newinfo) |
825 | return -ENOMEM; | |
826 | ||
31836064 ED |
827 | /* choose the copy that is on our node/cpu */ |
828 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
829 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1da177e4 LT |
830 | tmp.size) != 0) { |
831 | ret = -EFAULT; | |
832 | goto free_newinfo; | |
833 | } | |
834 | ||
2e4e6a17 | 835 | counters = vmalloc(tmp.num_counters * sizeof(struct xt_counters)); |
1da177e4 LT |
836 | if (!counters) { |
837 | ret = -ENOMEM; | |
838 | goto free_newinfo; | |
839 | } | |
1da177e4 LT |
840 | |
841 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
31836064 | 842 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, |
1da177e4 LT |
843 | tmp.hook_entry, tmp.underflow); |
844 | if (ret != 0) | |
845 | goto free_newinfo_counters; | |
846 | ||
847 | duprintf("arp_tables: Translated table\n"); | |
848 | ||
2e4e6a17 | 849 | t = try_then_request_module(xt_find_table_lock(NF_ARP, tmp.name), |
6b7d31fc HW |
850 | "arptable_%s", tmp.name); |
851 | if (!t || IS_ERR(t)) { | |
852 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 853 | goto free_newinfo_counters_untrans; |
6b7d31fc | 854 | } |
1da177e4 LT |
855 | |
856 | /* You lied! */ | |
857 | if (tmp.valid_hooks != t->valid_hooks) { | |
858 | duprintf("Valid hook crap: %08X vs %08X\n", | |
859 | tmp.valid_hooks, t->valid_hooks); | |
860 | ret = -EINVAL; | |
6b7d31fc | 861 | goto put_module; |
1da177e4 LT |
862 | } |
863 | ||
2e4e6a17 | 864 | oldinfo = xt_replace_table(t, tmp.num_counters, newinfo, &ret); |
1da177e4 LT |
865 | if (!oldinfo) |
866 | goto put_module; | |
867 | ||
868 | /* Update module usage count based on number of rules */ | |
869 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
870 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
871 | if ((oldinfo->number > oldinfo->initial_entries) || | |
872 | (newinfo->number <= oldinfo->initial_entries)) | |
873 | module_put(t->me); | |
874 | if ((oldinfo->number > oldinfo->initial_entries) && | |
875 | (newinfo->number <= oldinfo->initial_entries)) | |
876 | module_put(t->me); | |
877 | ||
878 | /* Get the old counters. */ | |
879 | get_counters(oldinfo, counters); | |
880 | /* Decrease module usage counts and free resource */ | |
31836064 ED |
881 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
882 | ARPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL); | |
883 | ||
2e4e6a17 | 884 | xt_free_table_info(oldinfo); |
1da177e4 | 885 | if (copy_to_user(tmp.counters, counters, |
2e4e6a17 | 886 | sizeof(struct xt_counters) * tmp.num_counters) != 0) |
1da177e4 LT |
887 | ret = -EFAULT; |
888 | vfree(counters); | |
2e4e6a17 | 889 | xt_table_unlock(t); |
1da177e4 LT |
890 | return ret; |
891 | ||
892 | put_module: | |
893 | module_put(t->me); | |
2e4e6a17 | 894 | xt_table_unlock(t); |
1da177e4 | 895 | free_newinfo_counters_untrans: |
31836064 | 896 | ARPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); |
1da177e4 LT |
897 | free_newinfo_counters: |
898 | vfree(counters); | |
899 | free_newinfo: | |
2e4e6a17 | 900 | xt_free_table_info(newinfo); |
1da177e4 LT |
901 | return ret; |
902 | } | |
903 | ||
904 | /* We're lazy, and add to the first CPU; overflow works its fey magic | |
905 | * and everything is OK. | |
906 | */ | |
907 | static inline int add_counter_to_entry(struct arpt_entry *e, | |
2e4e6a17 | 908 | const struct xt_counters addme[], |
1da177e4 LT |
909 | unsigned int *i) |
910 | { | |
911 | ||
912 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
913 | ||
914 | (*i)++; | |
915 | return 0; | |
916 | } | |
917 | ||
918 | static int do_add_counters(void __user *user, unsigned int len) | |
919 | { | |
920 | unsigned int i; | |
2e4e6a17 | 921 | struct xt_counters_info tmp, *paddc; |
1da177e4 | 922 | struct arpt_table *t; |
2e4e6a17 | 923 | struct xt_table_info *private; |
6b7d31fc | 924 | int ret = 0; |
31836064 | 925 | void *loc_cpu_entry; |
1da177e4 LT |
926 | |
927 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
928 | return -EFAULT; | |
929 | ||
2e4e6a17 | 930 | if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct xt_counters)) |
1da177e4 LT |
931 | return -EINVAL; |
932 | ||
933 | paddc = vmalloc(len); | |
934 | if (!paddc) | |
935 | return -ENOMEM; | |
936 | ||
937 | if (copy_from_user(paddc, user, len) != 0) { | |
938 | ret = -EFAULT; | |
939 | goto free; | |
940 | } | |
941 | ||
2e4e6a17 | 942 | t = xt_find_table_lock(NF_ARP, tmp.name); |
6b7d31fc HW |
943 | if (!t || IS_ERR(t)) { |
944 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 945 | goto free; |
6b7d31fc | 946 | } |
1da177e4 LT |
947 | |
948 | write_lock_bh(&t->lock); | |
2e4e6a17 HW |
949 | private = t->private; |
950 | if (private->number != paddc->num_counters) { | |
1da177e4 LT |
951 | ret = -EINVAL; |
952 | goto unlock_up_free; | |
953 | } | |
954 | ||
955 | i = 0; | |
31836064 | 956 | /* Choose the copy that is on our node */ |
2e4e6a17 | 957 | loc_cpu_entry = private->entries[smp_processor_id()]; |
31836064 | 958 | ARPT_ENTRY_ITERATE(loc_cpu_entry, |
2e4e6a17 | 959 | private->size, |
1da177e4 LT |
960 | add_counter_to_entry, |
961 | paddc->counters, | |
962 | &i); | |
963 | unlock_up_free: | |
964 | write_unlock_bh(&t->lock); | |
2e4e6a17 | 965 | xt_table_unlock(t); |
6b7d31fc | 966 | module_put(t->me); |
1da177e4 LT |
967 | free: |
968 | vfree(paddc); | |
969 | ||
970 | return ret; | |
971 | } | |
972 | ||
973 | static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) | |
974 | { | |
975 | int ret; | |
976 | ||
977 | if (!capable(CAP_NET_ADMIN)) | |
978 | return -EPERM; | |
979 | ||
980 | switch (cmd) { | |
981 | case ARPT_SO_SET_REPLACE: | |
982 | ret = do_replace(user, len); | |
983 | break; | |
984 | ||
985 | case ARPT_SO_SET_ADD_COUNTERS: | |
986 | ret = do_add_counters(user, len); | |
987 | break; | |
988 | ||
989 | default: | |
990 | duprintf("do_arpt_set_ctl: unknown request %i\n", cmd); | |
991 | ret = -EINVAL; | |
992 | } | |
993 | ||
994 | return ret; | |
995 | } | |
996 | ||
997 | static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
998 | { | |
999 | int ret; | |
1000 | ||
1001 | if (!capable(CAP_NET_ADMIN)) | |
1002 | return -EPERM; | |
1003 | ||
1004 | switch (cmd) { | |
1005 | case ARPT_SO_GET_INFO: { | |
1006 | char name[ARPT_TABLE_MAXNAMELEN]; | |
1007 | struct arpt_table *t; | |
1008 | ||
1009 | if (*len != sizeof(struct arpt_getinfo)) { | |
1010 | duprintf("length %u != %Zu\n", *len, | |
1011 | sizeof(struct arpt_getinfo)); | |
1012 | ret = -EINVAL; | |
1013 | break; | |
1014 | } | |
1015 | ||
1016 | if (copy_from_user(name, user, sizeof(name)) != 0) { | |
1017 | ret = -EFAULT; | |
1018 | break; | |
1019 | } | |
1020 | name[ARPT_TABLE_MAXNAMELEN-1] = '\0'; | |
6b7d31fc | 1021 | |
2e4e6a17 | 1022 | t = try_then_request_module(xt_find_table_lock(NF_ARP, name), |
6b7d31fc HW |
1023 | "arptable_%s", name); |
1024 | if (t && !IS_ERR(t)) { | |
1da177e4 | 1025 | struct arpt_getinfo info; |
2e4e6a17 | 1026 | struct xt_table_info *private = t->private; |
1da177e4 LT |
1027 | |
1028 | info.valid_hooks = t->valid_hooks; | |
2e4e6a17 | 1029 | memcpy(info.hook_entry, private->hook_entry, |
1da177e4 | 1030 | sizeof(info.hook_entry)); |
2e4e6a17 | 1031 | memcpy(info.underflow, private->underflow, |
1da177e4 | 1032 | sizeof(info.underflow)); |
2e4e6a17 HW |
1033 | info.num_entries = private->number; |
1034 | info.size = private->size; | |
1da177e4 LT |
1035 | strcpy(info.name, name); |
1036 | ||
1037 | if (copy_to_user(user, &info, *len) != 0) | |
1038 | ret = -EFAULT; | |
1039 | else | |
1040 | ret = 0; | |
2e4e6a17 | 1041 | xt_table_unlock(t); |
6b7d31fc HW |
1042 | module_put(t->me); |
1043 | } else | |
1044 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 LT |
1045 | } |
1046 | break; | |
1047 | ||
1048 | case ARPT_SO_GET_ENTRIES: { | |
1049 | struct arpt_get_entries get; | |
1050 | ||
1051 | if (*len < sizeof(get)) { | |
1052 | duprintf("get_entries: %u < %Zu\n", *len, sizeof(get)); | |
1053 | ret = -EINVAL; | |
1054 | } else if (copy_from_user(&get, user, sizeof(get)) != 0) { | |
1055 | ret = -EFAULT; | |
1056 | } else if (*len != sizeof(struct arpt_get_entries) + get.size) { | |
1057 | duprintf("get_entries: %u != %Zu\n", *len, | |
1058 | sizeof(struct arpt_get_entries) + get.size); | |
1059 | ret = -EINVAL; | |
1060 | } else | |
1061 | ret = get_entries(&get, user); | |
1062 | break; | |
1063 | } | |
1064 | ||
6b7d31fc | 1065 | case ARPT_SO_GET_REVISION_TARGET: { |
2e4e6a17 | 1066 | struct xt_get_revision rev; |
6b7d31fc HW |
1067 | |
1068 | if (*len != sizeof(rev)) { | |
1069 | ret = -EINVAL; | |
1070 | break; | |
1071 | } | |
1072 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1073 | ret = -EFAULT; | |
1074 | break; | |
1075 | } | |
1076 | ||
2e4e6a17 HW |
1077 | try_then_request_module(xt_find_revision(NF_ARP, rev.name, |
1078 | rev.revision, 1, &ret), | |
6b7d31fc HW |
1079 | "arpt_%s", rev.name); |
1080 | break; | |
1081 | } | |
1082 | ||
1da177e4 LT |
1083 | default: |
1084 | duprintf("do_arpt_get_ctl: unknown request %i\n", cmd); | |
1085 | ret = -EINVAL; | |
1086 | } | |
1087 | ||
1088 | return ret; | |
1089 | } | |
1090 | ||
1da177e4 LT |
1091 | int arpt_register_table(struct arpt_table *table, |
1092 | const struct arpt_replace *repl) | |
1093 | { | |
1094 | int ret; | |
2e4e6a17 HW |
1095 | struct xt_table_info *newinfo; |
1096 | static struct xt_table_info bootstrap | |
1da177e4 | 1097 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 1098 | void *loc_cpu_entry; |
1da177e4 | 1099 | |
2e4e6a17 | 1100 | newinfo = xt_alloc_table_info(repl->size); |
1da177e4 LT |
1101 | if (!newinfo) { |
1102 | ret = -ENOMEM; | |
1103 | return ret; | |
1104 | } | |
31836064 ED |
1105 | |
1106 | /* choose the copy on our node/cpu */ | |
1107 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1108 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
1109 | |
1110 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 1111 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
1112 | repl->num_entries, |
1113 | repl->hook_entry, | |
1114 | repl->underflow); | |
2e4e6a17 | 1115 | |
1da177e4 LT |
1116 | duprintf("arpt_register_table: translate table gives %d\n", ret); |
1117 | if (ret != 0) { | |
2e4e6a17 | 1118 | xt_free_table_info(newinfo); |
1da177e4 LT |
1119 | return ret; |
1120 | } | |
1121 | ||
2e4e6a17 HW |
1122 | if (xt_register_table(table, &bootstrap, newinfo) != 0) { |
1123 | xt_free_table_info(newinfo); | |
1da177e4 LT |
1124 | return ret; |
1125 | } | |
1126 | ||
2e4e6a17 | 1127 | return 0; |
1da177e4 LT |
1128 | } |
1129 | ||
1130 | void arpt_unregister_table(struct arpt_table *table) | |
1131 | { | |
2e4e6a17 | 1132 | struct xt_table_info *private; |
31836064 ED |
1133 | void *loc_cpu_entry; |
1134 | ||
2e4e6a17 | 1135 | private = xt_unregister_table(table); |
1da177e4 LT |
1136 | |
1137 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
1138 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
1139 | ARPT_ENTRY_ITERATE(loc_cpu_entry, private->size, | |
1da177e4 | 1140 | cleanup_entry, NULL); |
2e4e6a17 | 1141 | xt_free_table_info(private); |
1da177e4 LT |
1142 | } |
1143 | ||
1144 | /* The built-in targets: standard (NULL) and error. */ | |
1145 | static struct arpt_target arpt_standard_target = { | |
1146 | .name = ARPT_STANDARD_TARGET, | |
aa83c1ab | 1147 | .targetsize = sizeof(int), |
1da177e4 LT |
1148 | }; |
1149 | ||
1150 | static struct arpt_target arpt_error_target = { | |
1151 | .name = ARPT_ERROR_TARGET, | |
1152 | .target = arpt_error, | |
aa83c1ab | 1153 | .targetsize = ARPT_FUNCTION_MAXNAMELEN, |
1da177e4 LT |
1154 | }; |
1155 | ||
1156 | static struct nf_sockopt_ops arpt_sockopts = { | |
1157 | .pf = PF_INET, | |
1158 | .set_optmin = ARPT_BASE_CTL, | |
1159 | .set_optmax = ARPT_SO_SET_MAX+1, | |
1160 | .set = do_arpt_set_ctl, | |
1161 | .get_optmin = ARPT_BASE_CTL, | |
1162 | .get_optmax = ARPT_SO_GET_MAX+1, | |
1163 | .get = do_arpt_get_ctl, | |
1164 | }; | |
1165 | ||
1da177e4 LT |
1166 | static int __init init(void) |
1167 | { | |
1168 | int ret; | |
1169 | ||
2e4e6a17 HW |
1170 | xt_proto_init(NF_ARP); |
1171 | ||
1da177e4 | 1172 | /* Noone else will be downing sem now, so we won't sleep */ |
2e4e6a17 HW |
1173 | xt_register_target(NF_ARP, &arpt_standard_target); |
1174 | xt_register_target(NF_ARP, &arpt_error_target); | |
1da177e4 LT |
1175 | |
1176 | /* Register setsockopt */ | |
1177 | ret = nf_register_sockopt(&arpt_sockopts); | |
1178 | if (ret < 0) { | |
1179 | duprintf("Unable to register sockopts.\n"); | |
1180 | return ret; | |
1181 | } | |
1182 | ||
1da177e4 LT |
1183 | printk("arp_tables: (C) 2002 David S. Miller\n"); |
1184 | return 0; | |
1185 | } | |
1186 | ||
1187 | static void __exit fini(void) | |
1188 | { | |
1189 | nf_unregister_sockopt(&arpt_sockopts); | |
2e4e6a17 | 1190 | xt_proto_fini(NF_ARP); |
1da177e4 LT |
1191 | } |
1192 | ||
1193 | EXPORT_SYMBOL(arpt_register_table); | |
1194 | EXPORT_SYMBOL(arpt_unregister_table); | |
1195 | EXPORT_SYMBOL(arpt_do_table); | |
1da177e4 LT |
1196 | |
1197 | module_init(init); | |
1198 | module_exit(fini); |