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1da177e4 LT |
1 | /* |
2 | * NET3 IP device support routines. | |
3 | * | |
4 | * Version: $Id: devinet.c,v 1.44 2001/10/31 21:55:54 davem Exp $ | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * Derived from the IP parts of dev.c 1.0.19 | |
02c30a84 | 12 | * Authors: Ross Biro |
1da177e4 LT |
13 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
14 | * Mark Evans, <evansmp@uhura.aston.ac.uk> | |
15 | * | |
16 | * Additional Authors: | |
17 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
18 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
19 | * | |
20 | * Changes: | |
21 | * Alexey Kuznetsov: pa_* fields are replaced with ifaddr | |
22 | * lists. | |
23 | * Cyrus Durgin: updated for kmod | |
24 | * Matthias Andree: in devinet_ioctl, compare label and | |
25 | * address (4.4BSD alias style support), | |
26 | * fall back to comparing just the label | |
27 | * if no match found. | |
28 | */ | |
29 | ||
30 | #include <linux/config.h> | |
31 | ||
32 | #include <asm/uaccess.h> | |
33 | #include <asm/system.h> | |
34 | #include <linux/bitops.h> | |
35 | #include <linux/module.h> | |
36 | #include <linux/types.h> | |
37 | #include <linux/kernel.h> | |
38 | #include <linux/sched.h> | |
39 | #include <linux/string.h> | |
40 | #include <linux/mm.h> | |
41 | #include <linux/socket.h> | |
42 | #include <linux/sockios.h> | |
43 | #include <linux/in.h> | |
44 | #include <linux/errno.h> | |
45 | #include <linux/interrupt.h> | |
46 | #include <linux/if_ether.h> | |
47 | #include <linux/inet.h> | |
48 | #include <linux/netdevice.h> | |
49 | #include <linux/etherdevice.h> | |
50 | #include <linux/skbuff.h> | |
51 | #include <linux/rtnetlink.h> | |
52 | #include <linux/init.h> | |
53 | #include <linux/notifier.h> | |
54 | #include <linux/inetdevice.h> | |
55 | #include <linux/igmp.h> | |
56 | #ifdef CONFIG_SYSCTL | |
57 | #include <linux/sysctl.h> | |
58 | #endif | |
59 | #include <linux/kmod.h> | |
60 | ||
61 | #include <net/ip.h> | |
62 | #include <net/route.h> | |
63 | #include <net/ip_fib.h> | |
64 | ||
65 | struct ipv4_devconf ipv4_devconf = { | |
66 | .accept_redirects = 1, | |
67 | .send_redirects = 1, | |
68 | .secure_redirects = 1, | |
69 | .shared_media = 1, | |
70 | }; | |
71 | ||
72 | static struct ipv4_devconf ipv4_devconf_dflt = { | |
73 | .accept_redirects = 1, | |
74 | .send_redirects = 1, | |
75 | .secure_redirects = 1, | |
76 | .shared_media = 1, | |
77 | .accept_source_route = 1, | |
78 | }; | |
79 | ||
80 | static void rtmsg_ifa(int event, struct in_ifaddr *); | |
81 | ||
82 | static struct notifier_block *inetaddr_chain; | |
83 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, | |
84 | int destroy); | |
85 | #ifdef CONFIG_SYSCTL | |
86 | static void devinet_sysctl_register(struct in_device *in_dev, | |
87 | struct ipv4_devconf *p); | |
88 | static void devinet_sysctl_unregister(struct ipv4_devconf *p); | |
89 | #endif | |
90 | ||
91 | /* Locks all the inet devices. */ | |
92 | ||
93 | static struct in_ifaddr *inet_alloc_ifa(void) | |
94 | { | |
95 | struct in_ifaddr *ifa = kmalloc(sizeof(*ifa), GFP_KERNEL); | |
96 | ||
97 | if (ifa) { | |
98 | memset(ifa, 0, sizeof(*ifa)); | |
99 | INIT_RCU_HEAD(&ifa->rcu_head); | |
100 | } | |
101 | ||
102 | return ifa; | |
103 | } | |
104 | ||
105 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
106 | { | |
107 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
108 | if (ifa->ifa_dev) | |
109 | in_dev_put(ifa->ifa_dev); | |
110 | kfree(ifa); | |
111 | } | |
112 | ||
113 | static inline void inet_free_ifa(struct in_ifaddr *ifa) | |
114 | { | |
115 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
116 | } | |
117 | ||
118 | void in_dev_finish_destroy(struct in_device *idev) | |
119 | { | |
120 | struct net_device *dev = idev->dev; | |
121 | ||
122 | BUG_TRAP(!idev->ifa_list); | |
123 | BUG_TRAP(!idev->mc_list); | |
124 | #ifdef NET_REFCNT_DEBUG | |
125 | printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", | |
126 | idev, dev ? dev->name : "NIL"); | |
127 | #endif | |
128 | dev_put(dev); | |
129 | if (!idev->dead) | |
130 | printk("Freeing alive in_device %p\n", idev); | |
131 | else { | |
132 | kfree(idev); | |
133 | } | |
134 | } | |
135 | ||
136 | struct in_device *inetdev_init(struct net_device *dev) | |
137 | { | |
138 | struct in_device *in_dev; | |
139 | ||
140 | ASSERT_RTNL(); | |
141 | ||
142 | in_dev = kmalloc(sizeof(*in_dev), GFP_KERNEL); | |
143 | if (!in_dev) | |
144 | goto out; | |
145 | memset(in_dev, 0, sizeof(*in_dev)); | |
146 | INIT_RCU_HEAD(&in_dev->rcu_head); | |
147 | memcpy(&in_dev->cnf, &ipv4_devconf_dflt, sizeof(in_dev->cnf)); | |
148 | in_dev->cnf.sysctl = NULL; | |
149 | in_dev->dev = dev; | |
150 | if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL) | |
151 | goto out_kfree; | |
152 | /* Reference in_dev->dev */ | |
153 | dev_hold(dev); | |
154 | #ifdef CONFIG_SYSCTL | |
155 | neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4, | |
156 | NET_IPV4_NEIGH, "ipv4", NULL, NULL); | |
157 | #endif | |
158 | ||
159 | /* Account for reference dev->ip_ptr */ | |
160 | in_dev_hold(in_dev); | |
161 | rcu_assign_pointer(dev->ip_ptr, in_dev); | |
162 | ||
163 | #ifdef CONFIG_SYSCTL | |
164 | devinet_sysctl_register(in_dev, &in_dev->cnf); | |
165 | #endif | |
166 | ip_mc_init_dev(in_dev); | |
167 | if (dev->flags & IFF_UP) | |
168 | ip_mc_up(in_dev); | |
169 | out: | |
170 | return in_dev; | |
171 | out_kfree: | |
172 | kfree(in_dev); | |
173 | in_dev = NULL; | |
174 | goto out; | |
175 | } | |
176 | ||
177 | static void in_dev_rcu_put(struct rcu_head *head) | |
178 | { | |
179 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
180 | in_dev_put(idev); | |
181 | } | |
182 | ||
183 | static void inetdev_destroy(struct in_device *in_dev) | |
184 | { | |
185 | struct in_ifaddr *ifa; | |
186 | struct net_device *dev; | |
187 | ||
188 | ASSERT_RTNL(); | |
189 | ||
190 | dev = in_dev->dev; | |
191 | if (dev == &loopback_dev) | |
192 | return; | |
193 | ||
194 | in_dev->dead = 1; | |
195 | ||
196 | ip_mc_destroy_dev(in_dev); | |
197 | ||
198 | while ((ifa = in_dev->ifa_list) != NULL) { | |
199 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
200 | inet_free_ifa(ifa); | |
201 | } | |
202 | ||
203 | #ifdef CONFIG_SYSCTL | |
204 | devinet_sysctl_unregister(&in_dev->cnf); | |
205 | #endif | |
206 | ||
207 | dev->ip_ptr = NULL; | |
208 | ||
209 | #ifdef CONFIG_SYSCTL | |
210 | neigh_sysctl_unregister(in_dev->arp_parms); | |
211 | #endif | |
212 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); | |
213 | arp_ifdown(dev); | |
214 | ||
215 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
216 | } | |
217 | ||
218 | int inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b) | |
219 | { | |
220 | rcu_read_lock(); | |
221 | for_primary_ifa(in_dev) { | |
222 | if (inet_ifa_match(a, ifa)) { | |
223 | if (!b || inet_ifa_match(b, ifa)) { | |
224 | rcu_read_unlock(); | |
225 | return 1; | |
226 | } | |
227 | } | |
228 | } endfor_ifa(in_dev); | |
229 | rcu_read_unlock(); | |
230 | return 0; | |
231 | } | |
232 | ||
233 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, | |
234 | int destroy) | |
235 | { | |
8f937c60 | 236 | struct in_ifaddr *promote = NULL; |
1da177e4 LT |
237 | struct in_ifaddr *ifa1 = *ifap; |
238 | ||
239 | ASSERT_RTNL(); | |
240 | ||
8f937c60 HW |
241 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
242 | * unless alias promotion is set | |
243 | **/ | |
1da177e4 LT |
244 | |
245 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
246 | struct in_ifaddr *ifa; | |
247 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; | |
248 | ||
249 | while ((ifa = *ifap1) != NULL) { | |
250 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || | |
251 | ifa1->ifa_mask != ifa->ifa_mask || | |
252 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
253 | ifap1 = &ifa->ifa_next; | |
254 | continue; | |
255 | } | |
256 | ||
8f937c60 HW |
257 | if (!IN_DEV_PROMOTE_SECONDARIES(in_dev)) { |
258 | *ifap1 = ifa->ifa_next; | |
1da177e4 | 259 | |
8f937c60 HW |
260 | rtmsg_ifa(RTM_DELADDR, ifa); |
261 | notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa); | |
262 | inet_free_ifa(ifa); | |
263 | } else { | |
264 | promote = ifa; | |
265 | break; | |
266 | } | |
1da177e4 LT |
267 | } |
268 | } | |
269 | ||
270 | /* 2. Unlink it */ | |
271 | ||
272 | *ifap = ifa1->ifa_next; | |
273 | ||
274 | /* 3. Announce address deletion */ | |
275 | ||
276 | /* Send message first, then call notifier. | |
277 | At first sight, FIB update triggered by notifier | |
278 | will refer to already deleted ifaddr, that could confuse | |
279 | netlink listeners. It is not true: look, gated sees | |
280 | that route deleted and if it still thinks that ifaddr | |
281 | is valid, it will try to restore deleted routes... Grr. | |
282 | So that, this order is correct. | |
283 | */ | |
284 | rtmsg_ifa(RTM_DELADDR, ifa1); | |
285 | notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); | |
286 | if (destroy) { | |
287 | inet_free_ifa(ifa1); | |
288 | ||
289 | if (!in_dev->ifa_list) | |
290 | inetdev_destroy(in_dev); | |
291 | } | |
8f937c60 HW |
292 | |
293 | if (promote && IN_DEV_PROMOTE_SECONDARIES(in_dev)) { | |
294 | /* not sure if we should send a delete notify first? */ | |
295 | promote->ifa_flags &= ~IFA_F_SECONDARY; | |
296 | rtmsg_ifa(RTM_NEWADDR, promote); | |
297 | notifier_call_chain(&inetaddr_chain, NETDEV_UP, promote); | |
298 | } | |
1da177e4 LT |
299 | } |
300 | ||
301 | static int inet_insert_ifa(struct in_ifaddr *ifa) | |
302 | { | |
303 | struct in_device *in_dev = ifa->ifa_dev; | |
304 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
305 | ||
306 | ASSERT_RTNL(); | |
307 | ||
308 | if (!ifa->ifa_local) { | |
309 | inet_free_ifa(ifa); | |
310 | return 0; | |
311 | } | |
312 | ||
313 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
314 | last_primary = &in_dev->ifa_list; | |
315 | ||
316 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
317 | ifap = &ifa1->ifa_next) { | |
318 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
319 | ifa->ifa_scope <= ifa1->ifa_scope) | |
320 | last_primary = &ifa1->ifa_next; | |
321 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
322 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
323 | if (ifa1->ifa_local == ifa->ifa_local) { | |
324 | inet_free_ifa(ifa); | |
325 | return -EEXIST; | |
326 | } | |
327 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
328 | inet_free_ifa(ifa); | |
329 | return -EINVAL; | |
330 | } | |
331 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
332 | } | |
333 | } | |
334 | ||
335 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { | |
336 | net_srandom(ifa->ifa_local); | |
337 | ifap = last_primary; | |
338 | } | |
339 | ||
340 | ifa->ifa_next = *ifap; | |
341 | *ifap = ifa; | |
342 | ||
343 | /* Send message first, then call notifier. | |
344 | Notifier will trigger FIB update, so that | |
345 | listeners of netlink will know about new ifaddr */ | |
346 | rtmsg_ifa(RTM_NEWADDR, ifa); | |
347 | notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
352 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) | |
353 | { | |
354 | struct in_device *in_dev = __in_dev_get(dev); | |
355 | ||
356 | ASSERT_RTNL(); | |
357 | ||
358 | if (!in_dev) { | |
359 | in_dev = inetdev_init(dev); | |
360 | if (!in_dev) { | |
361 | inet_free_ifa(ifa); | |
362 | return -ENOBUFS; | |
363 | } | |
364 | } | |
365 | if (ifa->ifa_dev != in_dev) { | |
366 | BUG_TRAP(!ifa->ifa_dev); | |
367 | in_dev_hold(in_dev); | |
368 | ifa->ifa_dev = in_dev; | |
369 | } | |
370 | if (LOOPBACK(ifa->ifa_local)) | |
371 | ifa->ifa_scope = RT_SCOPE_HOST; | |
372 | return inet_insert_ifa(ifa); | |
373 | } | |
374 | ||
375 | struct in_device *inetdev_by_index(int ifindex) | |
376 | { | |
377 | struct net_device *dev; | |
378 | struct in_device *in_dev = NULL; | |
379 | read_lock(&dev_base_lock); | |
380 | dev = __dev_get_by_index(ifindex); | |
381 | if (dev) | |
382 | in_dev = in_dev_get(dev); | |
383 | read_unlock(&dev_base_lock); | |
384 | return in_dev; | |
385 | } | |
386 | ||
387 | /* Called only from RTNL semaphored context. No locks. */ | |
388 | ||
389 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, u32 prefix, | |
390 | u32 mask) | |
391 | { | |
392 | ASSERT_RTNL(); | |
393 | ||
394 | for_primary_ifa(in_dev) { | |
395 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
396 | return ifa; | |
397 | } endfor_ifa(in_dev); | |
398 | return NULL; | |
399 | } | |
400 | ||
401 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
402 | { | |
403 | struct rtattr **rta = arg; | |
404 | struct in_device *in_dev; | |
405 | struct ifaddrmsg *ifm = NLMSG_DATA(nlh); | |
406 | struct in_ifaddr *ifa, **ifap; | |
407 | ||
408 | ASSERT_RTNL(); | |
409 | ||
410 | if ((in_dev = inetdev_by_index(ifm->ifa_index)) == NULL) | |
411 | goto out; | |
412 | __in_dev_put(in_dev); | |
413 | ||
414 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
415 | ifap = &ifa->ifa_next) { | |
416 | if ((rta[IFA_LOCAL - 1] && | |
417 | memcmp(RTA_DATA(rta[IFA_LOCAL - 1]), | |
418 | &ifa->ifa_local, 4)) || | |
419 | (rta[IFA_LABEL - 1] && | |
420 | rtattr_strcmp(rta[IFA_LABEL - 1], ifa->ifa_label)) || | |
421 | (rta[IFA_ADDRESS - 1] && | |
422 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
423 | !inet_ifa_match(*(u32*)RTA_DATA(rta[IFA_ADDRESS - 1]), | |
424 | ifa)))) | |
425 | continue; | |
426 | inet_del_ifa(in_dev, ifap, 1); | |
427 | return 0; | |
428 | } | |
429 | out: | |
430 | return -EADDRNOTAVAIL; | |
431 | } | |
432 | ||
433 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
434 | { | |
435 | struct rtattr **rta = arg; | |
436 | struct net_device *dev; | |
437 | struct in_device *in_dev; | |
438 | struct ifaddrmsg *ifm = NLMSG_DATA(nlh); | |
439 | struct in_ifaddr *ifa; | |
440 | int rc = -EINVAL; | |
441 | ||
442 | ASSERT_RTNL(); | |
443 | ||
444 | if (ifm->ifa_prefixlen > 32 || !rta[IFA_LOCAL - 1]) | |
445 | goto out; | |
446 | ||
447 | rc = -ENODEV; | |
448 | if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL) | |
449 | goto out; | |
450 | ||
451 | rc = -ENOBUFS; | |
452 | if ((in_dev = __in_dev_get(dev)) == NULL) { | |
453 | in_dev = inetdev_init(dev); | |
454 | if (!in_dev) | |
455 | goto out; | |
456 | } | |
457 | ||
458 | if ((ifa = inet_alloc_ifa()) == NULL) | |
459 | goto out; | |
460 | ||
461 | if (!rta[IFA_ADDRESS - 1]) | |
462 | rta[IFA_ADDRESS - 1] = rta[IFA_LOCAL - 1]; | |
463 | memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL - 1]), 4); | |
464 | memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS - 1]), 4); | |
465 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; | |
466 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
467 | if (rta[IFA_BROADCAST - 1]) | |
468 | memcpy(&ifa->ifa_broadcast, | |
469 | RTA_DATA(rta[IFA_BROADCAST - 1]), 4); | |
470 | if (rta[IFA_ANYCAST - 1]) | |
471 | memcpy(&ifa->ifa_anycast, RTA_DATA(rta[IFA_ANYCAST - 1]), 4); | |
472 | ifa->ifa_flags = ifm->ifa_flags; | |
473 | ifa->ifa_scope = ifm->ifa_scope; | |
474 | in_dev_hold(in_dev); | |
475 | ifa->ifa_dev = in_dev; | |
476 | if (rta[IFA_LABEL - 1]) | |
477 | rtattr_strlcpy(ifa->ifa_label, rta[IFA_LABEL - 1], IFNAMSIZ); | |
478 | else | |
479 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
480 | ||
481 | rc = inet_insert_ifa(ifa); | |
482 | out: | |
483 | return rc; | |
484 | } | |
485 | ||
486 | /* | |
487 | * Determine a default network mask, based on the IP address. | |
488 | */ | |
489 | ||
490 | static __inline__ int inet_abc_len(u32 addr) | |
491 | { | |
492 | int rc = -1; /* Something else, probably a multicast. */ | |
493 | ||
494 | if (ZERONET(addr)) | |
495 | rc = 0; | |
496 | else { | |
497 | addr = ntohl(addr); | |
498 | ||
499 | if (IN_CLASSA(addr)) | |
500 | rc = 8; | |
501 | else if (IN_CLASSB(addr)) | |
502 | rc = 16; | |
503 | else if (IN_CLASSC(addr)) | |
504 | rc = 24; | |
505 | } | |
506 | ||
507 | return rc; | |
508 | } | |
509 | ||
510 | ||
511 | int devinet_ioctl(unsigned int cmd, void __user *arg) | |
512 | { | |
513 | struct ifreq ifr; | |
514 | struct sockaddr_in sin_orig; | |
515 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
516 | struct in_device *in_dev; | |
517 | struct in_ifaddr **ifap = NULL; | |
518 | struct in_ifaddr *ifa = NULL; | |
519 | struct net_device *dev; | |
520 | char *colon; | |
521 | int ret = -EFAULT; | |
522 | int tryaddrmatch = 0; | |
523 | ||
524 | /* | |
525 | * Fetch the caller's info block into kernel space | |
526 | */ | |
527 | ||
528 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
529 | goto out; | |
530 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
531 | ||
532 | /* save original address for comparison */ | |
533 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
534 | ||
535 | colon = strchr(ifr.ifr_name, ':'); | |
536 | if (colon) | |
537 | *colon = 0; | |
538 | ||
539 | #ifdef CONFIG_KMOD | |
540 | dev_load(ifr.ifr_name); | |
541 | #endif | |
542 | ||
543 | switch(cmd) { | |
544 | case SIOCGIFADDR: /* Get interface address */ | |
545 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
546 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
547 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
548 | /* Note that these ioctls will not sleep, | |
549 | so that we do not impose a lock. | |
550 | One day we will be forced to put shlock here (I mean SMP) | |
551 | */ | |
552 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
553 | memset(sin, 0, sizeof(*sin)); | |
554 | sin->sin_family = AF_INET; | |
555 | break; | |
556 | ||
557 | case SIOCSIFFLAGS: | |
558 | ret = -EACCES; | |
559 | if (!capable(CAP_NET_ADMIN)) | |
560 | goto out; | |
561 | break; | |
562 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
563 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
564 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
565 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
566 | ret = -EACCES; | |
567 | if (!capable(CAP_NET_ADMIN)) | |
568 | goto out; | |
569 | ret = -EINVAL; | |
570 | if (sin->sin_family != AF_INET) | |
571 | goto out; | |
572 | break; | |
573 | default: | |
574 | ret = -EINVAL; | |
575 | goto out; | |
576 | } | |
577 | ||
578 | rtnl_lock(); | |
579 | ||
580 | ret = -ENODEV; | |
581 | if ((dev = __dev_get_by_name(ifr.ifr_name)) == NULL) | |
582 | goto done; | |
583 | ||
584 | if (colon) | |
585 | *colon = ':'; | |
586 | ||
587 | if ((in_dev = __in_dev_get(dev)) != NULL) { | |
588 | if (tryaddrmatch) { | |
589 | /* Matthias Andree */ | |
590 | /* compare label and address (4.4BSD style) */ | |
591 | /* note: we only do this for a limited set of ioctls | |
592 | and only if the original address family was AF_INET. | |
593 | This is checked above. */ | |
594 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
595 | ifap = &ifa->ifa_next) { | |
596 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
597 | sin_orig.sin_addr.s_addr == | |
598 | ifa->ifa_address) { | |
599 | break; /* found */ | |
600 | } | |
601 | } | |
602 | } | |
603 | /* we didn't get a match, maybe the application is | |
604 | 4.3BSD-style and passed in junk so we fall back to | |
605 | comparing just the label */ | |
606 | if (!ifa) { | |
607 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
608 | ifap = &ifa->ifa_next) | |
609 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
610 | break; | |
611 | } | |
612 | } | |
613 | ||
614 | ret = -EADDRNOTAVAIL; | |
615 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
616 | goto done; | |
617 | ||
618 | switch(cmd) { | |
619 | case SIOCGIFADDR: /* Get interface address */ | |
620 | sin->sin_addr.s_addr = ifa->ifa_local; | |
621 | goto rarok; | |
622 | ||
623 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
624 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
625 | goto rarok; | |
626 | ||
627 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
628 | sin->sin_addr.s_addr = ifa->ifa_address; | |
629 | goto rarok; | |
630 | ||
631 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
632 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
633 | goto rarok; | |
634 | ||
635 | case SIOCSIFFLAGS: | |
636 | if (colon) { | |
637 | ret = -EADDRNOTAVAIL; | |
638 | if (!ifa) | |
639 | break; | |
640 | ret = 0; | |
641 | if (!(ifr.ifr_flags & IFF_UP)) | |
642 | inet_del_ifa(in_dev, ifap, 1); | |
643 | break; | |
644 | } | |
645 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
646 | break; | |
647 | ||
648 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
649 | ret = -EINVAL; | |
650 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
651 | break; | |
652 | ||
653 | if (!ifa) { | |
654 | ret = -ENOBUFS; | |
655 | if ((ifa = inet_alloc_ifa()) == NULL) | |
656 | break; | |
657 | if (colon) | |
658 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
659 | else | |
660 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
661 | } else { | |
662 | ret = 0; | |
663 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
664 | break; | |
665 | inet_del_ifa(in_dev, ifap, 0); | |
666 | ifa->ifa_broadcast = 0; | |
667 | ifa->ifa_anycast = 0; | |
668 | } | |
669 | ||
670 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
671 | ||
672 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
673 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
674 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
675 | if ((dev->flags & IFF_BROADCAST) && | |
676 | ifa->ifa_prefixlen < 31) | |
677 | ifa->ifa_broadcast = ifa->ifa_address | | |
678 | ~ifa->ifa_mask; | |
679 | } else { | |
680 | ifa->ifa_prefixlen = 32; | |
681 | ifa->ifa_mask = inet_make_mask(32); | |
682 | } | |
683 | ret = inet_set_ifa(dev, ifa); | |
684 | break; | |
685 | ||
686 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
687 | ret = 0; | |
688 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
689 | inet_del_ifa(in_dev, ifap, 0); | |
690 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
691 | inet_insert_ifa(ifa); | |
692 | } | |
693 | break; | |
694 | ||
695 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
696 | ret = 0; | |
697 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
698 | break; | |
699 | ret = -EINVAL; | |
700 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
701 | break; | |
702 | ret = 0; | |
703 | inet_del_ifa(in_dev, ifap, 0); | |
704 | ifa->ifa_address = sin->sin_addr.s_addr; | |
705 | inet_insert_ifa(ifa); | |
706 | break; | |
707 | ||
708 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
709 | ||
710 | /* | |
711 | * The mask we set must be legal. | |
712 | */ | |
713 | ret = -EINVAL; | |
714 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
715 | break; | |
716 | ret = 0; | |
717 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
718 | inet_del_ifa(in_dev, ifap, 0); | |
719 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
720 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
721 | ||
722 | /* See if current broadcast address matches | |
723 | * with current netmask, then recalculate | |
724 | * the broadcast address. Otherwise it's a | |
725 | * funny address, so don't touch it since | |
726 | * the user seems to know what (s)he's doing... | |
727 | */ | |
728 | if ((dev->flags & IFF_BROADCAST) && | |
729 | (ifa->ifa_prefixlen < 31) && | |
730 | (ifa->ifa_broadcast == | |
731 | (ifa->ifa_local|~ifa->ifa_mask))) { | |
732 | ifa->ifa_broadcast = (ifa->ifa_local | | |
733 | ~sin->sin_addr.s_addr); | |
734 | } | |
735 | inet_insert_ifa(ifa); | |
736 | } | |
737 | break; | |
738 | } | |
739 | done: | |
740 | rtnl_unlock(); | |
741 | out: | |
742 | return ret; | |
743 | rarok: | |
744 | rtnl_unlock(); | |
745 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
746 | goto out; | |
747 | } | |
748 | ||
749 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
750 | { | |
751 | struct in_device *in_dev = __in_dev_get(dev); | |
752 | struct in_ifaddr *ifa; | |
753 | struct ifreq ifr; | |
754 | int done = 0; | |
755 | ||
756 | if (!in_dev || (ifa = in_dev->ifa_list) == NULL) | |
757 | goto out; | |
758 | ||
759 | for (; ifa; ifa = ifa->ifa_next) { | |
760 | if (!buf) { | |
761 | done += sizeof(ifr); | |
762 | continue; | |
763 | } | |
764 | if (len < (int) sizeof(ifr)) | |
765 | break; | |
766 | memset(&ifr, 0, sizeof(struct ifreq)); | |
767 | if (ifa->ifa_label) | |
768 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
769 | else | |
770 | strcpy(ifr.ifr_name, dev->name); | |
771 | ||
772 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
773 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
774 | ifa->ifa_local; | |
775 | ||
776 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
777 | done = -EFAULT; | |
778 | break; | |
779 | } | |
780 | buf += sizeof(struct ifreq); | |
781 | len -= sizeof(struct ifreq); | |
782 | done += sizeof(struct ifreq); | |
783 | } | |
784 | out: | |
785 | return done; | |
786 | } | |
787 | ||
788 | u32 inet_select_addr(const struct net_device *dev, u32 dst, int scope) | |
789 | { | |
790 | u32 addr = 0; | |
791 | struct in_device *in_dev; | |
792 | ||
793 | rcu_read_lock(); | |
794 | in_dev = __in_dev_get(dev); | |
795 | if (!in_dev) | |
796 | goto no_in_dev; | |
797 | ||
798 | for_primary_ifa(in_dev) { | |
799 | if (ifa->ifa_scope > scope) | |
800 | continue; | |
801 | if (!dst || inet_ifa_match(dst, ifa)) { | |
802 | addr = ifa->ifa_local; | |
803 | break; | |
804 | } | |
805 | if (!addr) | |
806 | addr = ifa->ifa_local; | |
807 | } endfor_ifa(in_dev); | |
808 | no_in_dev: | |
809 | rcu_read_unlock(); | |
810 | ||
811 | if (addr) | |
812 | goto out; | |
813 | ||
814 | /* Not loopback addresses on loopback should be preferred | |
815 | in this case. It is importnat that lo is the first interface | |
816 | in dev_base list. | |
817 | */ | |
818 | read_lock(&dev_base_lock); | |
819 | rcu_read_lock(); | |
820 | for (dev = dev_base; dev; dev = dev->next) { | |
821 | if ((in_dev = __in_dev_get(dev)) == NULL) | |
822 | continue; | |
823 | ||
824 | for_primary_ifa(in_dev) { | |
825 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
826 | ifa->ifa_scope <= scope) { | |
827 | addr = ifa->ifa_local; | |
828 | goto out_unlock_both; | |
829 | } | |
830 | } endfor_ifa(in_dev); | |
831 | } | |
832 | out_unlock_both: | |
833 | read_unlock(&dev_base_lock); | |
834 | rcu_read_unlock(); | |
835 | out: | |
836 | return addr; | |
837 | } | |
838 | ||
839 | static u32 confirm_addr_indev(struct in_device *in_dev, u32 dst, | |
840 | u32 local, int scope) | |
841 | { | |
842 | int same = 0; | |
843 | u32 addr = 0; | |
844 | ||
845 | for_ifa(in_dev) { | |
846 | if (!addr && | |
847 | (local == ifa->ifa_local || !local) && | |
848 | ifa->ifa_scope <= scope) { | |
849 | addr = ifa->ifa_local; | |
850 | if (same) | |
851 | break; | |
852 | } | |
853 | if (!same) { | |
854 | same = (!local || inet_ifa_match(local, ifa)) && | |
855 | (!dst || inet_ifa_match(dst, ifa)); | |
856 | if (same && addr) { | |
857 | if (local || !dst) | |
858 | break; | |
859 | /* Is the selected addr into dst subnet? */ | |
860 | if (inet_ifa_match(addr, ifa)) | |
861 | break; | |
862 | /* No, then can we use new local src? */ | |
863 | if (ifa->ifa_scope <= scope) { | |
864 | addr = ifa->ifa_local; | |
865 | break; | |
866 | } | |
867 | /* search for large dst subnet for addr */ | |
868 | same = 0; | |
869 | } | |
870 | } | |
871 | } endfor_ifa(in_dev); | |
872 | ||
873 | return same? addr : 0; | |
874 | } | |
875 | ||
876 | /* | |
877 | * Confirm that local IP address exists using wildcards: | |
878 | * - dev: only on this interface, 0=any interface | |
879 | * - dst: only in the same subnet as dst, 0=any dst | |
880 | * - local: address, 0=autoselect the local address | |
881 | * - scope: maximum allowed scope value for the local address | |
882 | */ | |
883 | u32 inet_confirm_addr(const struct net_device *dev, u32 dst, u32 local, int scope) | |
884 | { | |
885 | u32 addr = 0; | |
886 | struct in_device *in_dev; | |
887 | ||
888 | if (dev) { | |
889 | rcu_read_lock(); | |
890 | if ((in_dev = __in_dev_get(dev))) | |
891 | addr = confirm_addr_indev(in_dev, dst, local, scope); | |
892 | rcu_read_unlock(); | |
893 | ||
894 | return addr; | |
895 | } | |
896 | ||
897 | read_lock(&dev_base_lock); | |
898 | rcu_read_lock(); | |
899 | for (dev = dev_base; dev; dev = dev->next) { | |
900 | if ((in_dev = __in_dev_get(dev))) { | |
901 | addr = confirm_addr_indev(in_dev, dst, local, scope); | |
902 | if (addr) | |
903 | break; | |
904 | } | |
905 | } | |
906 | rcu_read_unlock(); | |
907 | read_unlock(&dev_base_lock); | |
908 | ||
909 | return addr; | |
910 | } | |
911 | ||
912 | /* | |
913 | * Device notifier | |
914 | */ | |
915 | ||
916 | int register_inetaddr_notifier(struct notifier_block *nb) | |
917 | { | |
918 | return notifier_chain_register(&inetaddr_chain, nb); | |
919 | } | |
920 | ||
921 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
922 | { | |
923 | return notifier_chain_unregister(&inetaddr_chain, nb); | |
924 | } | |
925 | ||
926 | /* Rename ifa_labels for a device name change. Make some effort to preserve existing | |
927 | * alias numbering and to create unique labels if possible. | |
928 | */ | |
929 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
930 | { | |
931 | struct in_ifaddr *ifa; | |
932 | int named = 0; | |
933 | ||
934 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { | |
935 | char old[IFNAMSIZ], *dot; | |
936 | ||
937 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
938 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
939 | if (named++ == 0) | |
940 | continue; | |
941 | dot = strchr(ifa->ifa_label, ':'); | |
942 | if (dot == NULL) { | |
943 | sprintf(old, ":%d", named); | |
944 | dot = old; | |
945 | } | |
946 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) { | |
947 | strcat(ifa->ifa_label, dot); | |
948 | } else { | |
949 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); | |
950 | } | |
951 | } | |
952 | } | |
953 | ||
954 | /* Called only under RTNL semaphore */ | |
955 | ||
956 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
957 | void *ptr) | |
958 | { | |
959 | struct net_device *dev = ptr; | |
960 | struct in_device *in_dev = __in_dev_get(dev); | |
961 | ||
962 | ASSERT_RTNL(); | |
963 | ||
964 | if (!in_dev) { | |
965 | if (event == NETDEV_REGISTER && dev == &loopback_dev) { | |
966 | in_dev = inetdev_init(dev); | |
967 | if (!in_dev) | |
968 | panic("devinet: Failed to create loopback\n"); | |
969 | in_dev->cnf.no_xfrm = 1; | |
970 | in_dev->cnf.no_policy = 1; | |
971 | } | |
972 | goto out; | |
973 | } | |
974 | ||
975 | switch (event) { | |
976 | case NETDEV_REGISTER: | |
977 | printk(KERN_DEBUG "inetdev_event: bug\n"); | |
978 | dev->ip_ptr = NULL; | |
979 | break; | |
980 | case NETDEV_UP: | |
981 | if (dev->mtu < 68) | |
982 | break; | |
983 | if (dev == &loopback_dev) { | |
984 | struct in_ifaddr *ifa; | |
985 | if ((ifa = inet_alloc_ifa()) != NULL) { | |
986 | ifa->ifa_local = | |
987 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
988 | ifa->ifa_prefixlen = 8; | |
989 | ifa->ifa_mask = inet_make_mask(8); | |
990 | in_dev_hold(in_dev); | |
991 | ifa->ifa_dev = in_dev; | |
992 | ifa->ifa_scope = RT_SCOPE_HOST; | |
993 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
994 | inet_insert_ifa(ifa); | |
995 | } | |
996 | } | |
997 | ip_mc_up(in_dev); | |
998 | break; | |
999 | case NETDEV_DOWN: | |
1000 | ip_mc_down(in_dev); | |
1001 | break; | |
1002 | case NETDEV_CHANGEMTU: | |
1003 | if (dev->mtu >= 68) | |
1004 | break; | |
1005 | /* MTU falled under 68, disable IP */ | |
1006 | case NETDEV_UNREGISTER: | |
1007 | inetdev_destroy(in_dev); | |
1008 | break; | |
1009 | case NETDEV_CHANGENAME: | |
1010 | /* Do not notify about label change, this event is | |
1011 | * not interesting to applications using netlink. | |
1012 | */ | |
1013 | inetdev_changename(dev, in_dev); | |
1014 | ||
1015 | #ifdef CONFIG_SYSCTL | |
1016 | devinet_sysctl_unregister(&in_dev->cnf); | |
1017 | neigh_sysctl_unregister(in_dev->arp_parms); | |
1018 | neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4, | |
1019 | NET_IPV4_NEIGH, "ipv4", NULL, NULL); | |
1020 | devinet_sysctl_register(in_dev, &in_dev->cnf); | |
1021 | #endif | |
1022 | break; | |
1023 | } | |
1024 | out: | |
1025 | return NOTIFY_DONE; | |
1026 | } | |
1027 | ||
1028 | static struct notifier_block ip_netdev_notifier = { | |
1029 | .notifier_call =inetdev_event, | |
1030 | }; | |
1031 | ||
1032 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, | |
b6544c0b | 1033 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1034 | { |
1035 | struct ifaddrmsg *ifm; | |
1036 | struct nlmsghdr *nlh; | |
1037 | unsigned char *b = skb->tail; | |
1038 | ||
b6544c0b | 1039 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags); |
1da177e4 LT |
1040 | ifm = NLMSG_DATA(nlh); |
1041 | ifm->ifa_family = AF_INET; | |
1042 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1043 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1044 | ifm->ifa_scope = ifa->ifa_scope; | |
1045 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
1046 | if (ifa->ifa_address) | |
1047 | RTA_PUT(skb, IFA_ADDRESS, 4, &ifa->ifa_address); | |
1048 | if (ifa->ifa_local) | |
1049 | RTA_PUT(skb, IFA_LOCAL, 4, &ifa->ifa_local); | |
1050 | if (ifa->ifa_broadcast) | |
1051 | RTA_PUT(skb, IFA_BROADCAST, 4, &ifa->ifa_broadcast); | |
1052 | if (ifa->ifa_anycast) | |
1053 | RTA_PUT(skb, IFA_ANYCAST, 4, &ifa->ifa_anycast); | |
1054 | if (ifa->ifa_label[0]) | |
1055 | RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label); | |
1056 | nlh->nlmsg_len = skb->tail - b; | |
1057 | return skb->len; | |
1058 | ||
1059 | nlmsg_failure: | |
1060 | rtattr_failure: | |
1061 | skb_trim(skb, b - skb->data); | |
1062 | return -1; | |
1063 | } | |
1064 | ||
1065 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1066 | { | |
1067 | int idx, ip_idx; | |
1068 | struct net_device *dev; | |
1069 | struct in_device *in_dev; | |
1070 | struct in_ifaddr *ifa; | |
1071 | int s_ip_idx, s_idx = cb->args[0]; | |
1072 | ||
1073 | s_ip_idx = ip_idx = cb->args[1]; | |
1074 | read_lock(&dev_base_lock); | |
1075 | for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { | |
1076 | if (idx < s_idx) | |
1077 | continue; | |
1078 | if (idx > s_idx) | |
1079 | s_ip_idx = 0; | |
1080 | rcu_read_lock(); | |
1081 | if ((in_dev = __in_dev_get(dev)) == NULL) { | |
1082 | rcu_read_unlock(); | |
1083 | continue; | |
1084 | } | |
1085 | ||
1086 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; | |
1087 | ifa = ifa->ifa_next, ip_idx++) { | |
1088 | if (ip_idx < s_ip_idx) | |
1089 | continue; | |
1090 | if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, | |
1091 | cb->nlh->nlmsg_seq, | |
b6544c0b | 1092 | RTM_NEWADDR, NLM_F_MULTI) <= 0) { |
1da177e4 LT |
1093 | rcu_read_unlock(); |
1094 | goto done; | |
1095 | } | |
1096 | } | |
1097 | rcu_read_unlock(); | |
1098 | } | |
1099 | ||
1100 | done: | |
1101 | read_unlock(&dev_base_lock); | |
1102 | cb->args[0] = idx; | |
1103 | cb->args[1] = ip_idx; | |
1104 | ||
1105 | return skb->len; | |
1106 | } | |
1107 | ||
1108 | static void rtmsg_ifa(int event, struct in_ifaddr* ifa) | |
1109 | { | |
1110 | int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + 128); | |
1111 | struct sk_buff *skb = alloc_skb(size, GFP_KERNEL); | |
1112 | ||
1113 | if (!skb) | |
ac6d439d | 1114 | netlink_set_err(rtnl, 0, RTNLGRP_IPV4_IFADDR, ENOBUFS); |
9ed19f33 | 1115 | else if (inet_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) { |
1da177e4 | 1116 | kfree_skb(skb); |
ac6d439d | 1117 | netlink_set_err(rtnl, 0, RTNLGRP_IPV4_IFADDR, EINVAL); |
1da177e4 | 1118 | } else { |
ac6d439d | 1119 | netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV4_IFADDR, GFP_KERNEL); |
1da177e4 LT |
1120 | } |
1121 | } | |
1122 | ||
db46edc6 TG |
1123 | static struct rtnetlink_link inet_rtnetlink_table[RTM_NR_MSGTYPES] = { |
1124 | [RTM_NEWADDR - RTM_BASE] = { .doit = inet_rtm_newaddr, }, | |
1125 | [RTM_DELADDR - RTM_BASE] = { .doit = inet_rtm_deladdr, }, | |
1126 | [RTM_GETADDR - RTM_BASE] = { .dumpit = inet_dump_ifaddr, }, | |
1127 | [RTM_NEWROUTE - RTM_BASE] = { .doit = inet_rtm_newroute, }, | |
1128 | [RTM_DELROUTE - RTM_BASE] = { .doit = inet_rtm_delroute, }, | |
1129 | [RTM_GETROUTE - RTM_BASE] = { .doit = inet_rtm_getroute, | |
1130 | .dumpit = inet_dump_fib, }, | |
1da177e4 | 1131 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
db46edc6 TG |
1132 | [RTM_NEWRULE - RTM_BASE] = { .doit = inet_rtm_newrule, }, |
1133 | [RTM_DELRULE - RTM_BASE] = { .doit = inet_rtm_delrule, }, | |
1134 | [RTM_GETRULE - RTM_BASE] = { .dumpit = inet_dump_rules, }, | |
1da177e4 LT |
1135 | #endif |
1136 | }; | |
1137 | ||
1138 | #ifdef CONFIG_SYSCTL | |
1139 | ||
1140 | void inet_forward_change(void) | |
1141 | { | |
1142 | struct net_device *dev; | |
1143 | int on = ipv4_devconf.forwarding; | |
1144 | ||
1145 | ipv4_devconf.accept_redirects = !on; | |
1146 | ipv4_devconf_dflt.forwarding = on; | |
1147 | ||
1148 | read_lock(&dev_base_lock); | |
1149 | for (dev = dev_base; dev; dev = dev->next) { | |
1150 | struct in_device *in_dev; | |
1151 | rcu_read_lock(); | |
1152 | in_dev = __in_dev_get(dev); | |
1153 | if (in_dev) | |
1154 | in_dev->cnf.forwarding = on; | |
1155 | rcu_read_unlock(); | |
1156 | } | |
1157 | read_unlock(&dev_base_lock); | |
1158 | ||
1159 | rt_cache_flush(0); | |
1160 | } | |
1161 | ||
1162 | static int devinet_sysctl_forward(ctl_table *ctl, int write, | |
1163 | struct file* filp, void __user *buffer, | |
1164 | size_t *lenp, loff_t *ppos) | |
1165 | { | |
1166 | int *valp = ctl->data; | |
1167 | int val = *valp; | |
1168 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1169 | ||
1170 | if (write && *valp != val) { | |
1171 | if (valp == &ipv4_devconf.forwarding) | |
1172 | inet_forward_change(); | |
1173 | else if (valp != &ipv4_devconf_dflt.forwarding) | |
1174 | rt_cache_flush(0); | |
1175 | } | |
1176 | ||
1177 | return ret; | |
1178 | } | |
1179 | ||
1180 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
1181 | struct file* filp, void __user *buffer, | |
1182 | size_t *lenp, loff_t *ppos) | |
1183 | { | |
1184 | int *valp = ctl->data; | |
1185 | int val = *valp; | |
1186 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1187 | ||
1188 | if (write && *valp != val) | |
1189 | rt_cache_flush(0); | |
1190 | ||
1191 | return ret; | |
1192 | } | |
1193 | ||
1194 | int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, | |
1195 | void __user *oldval, size_t __user *oldlenp, | |
1196 | void __user *newval, size_t newlen, | |
1197 | void **context) | |
1198 | { | |
1199 | int *valp = table->data; | |
1200 | int new; | |
1201 | ||
1202 | if (!newval || !newlen) | |
1203 | return 0; | |
1204 | ||
1205 | if (newlen != sizeof(int)) | |
1206 | return -EINVAL; | |
1207 | ||
1208 | if (get_user(new, (int __user *)newval)) | |
1209 | return -EFAULT; | |
1210 | ||
1211 | if (new == *valp) | |
1212 | return 0; | |
1213 | ||
1214 | if (oldval && oldlenp) { | |
1215 | size_t len; | |
1216 | ||
1217 | if (get_user(len, oldlenp)) | |
1218 | return -EFAULT; | |
1219 | ||
1220 | if (len) { | |
1221 | if (len > table->maxlen) | |
1222 | len = table->maxlen; | |
1223 | if (copy_to_user(oldval, valp, len)) | |
1224 | return -EFAULT; | |
1225 | if (put_user(len, oldlenp)) | |
1226 | return -EFAULT; | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | *valp = new; | |
1231 | rt_cache_flush(0); | |
1232 | return 1; | |
1233 | } | |
1234 | ||
1235 | ||
1236 | static struct devinet_sysctl_table { | |
1237 | struct ctl_table_header *sysctl_header; | |
1238 | ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; | |
1239 | ctl_table devinet_dev[2]; | |
1240 | ctl_table devinet_conf_dir[2]; | |
1241 | ctl_table devinet_proto_dir[2]; | |
1242 | ctl_table devinet_root_dir[2]; | |
1243 | } devinet_sysctl = { | |
1244 | .devinet_vars = { | |
1245 | { | |
1246 | .ctl_name = NET_IPV4_CONF_FORWARDING, | |
1247 | .procname = "forwarding", | |
1248 | .data = &ipv4_devconf.forwarding, | |
1249 | .maxlen = sizeof(int), | |
1250 | .mode = 0644, | |
1251 | .proc_handler = &devinet_sysctl_forward, | |
1252 | }, | |
1253 | { | |
1254 | .ctl_name = NET_IPV4_CONF_MC_FORWARDING, | |
1255 | .procname = "mc_forwarding", | |
1256 | .data = &ipv4_devconf.mc_forwarding, | |
1257 | .maxlen = sizeof(int), | |
1258 | .mode = 0444, | |
1259 | .proc_handler = &proc_dointvec, | |
1260 | }, | |
1261 | { | |
1262 | .ctl_name = NET_IPV4_CONF_ACCEPT_REDIRECTS, | |
1263 | .procname = "accept_redirects", | |
1264 | .data = &ipv4_devconf.accept_redirects, | |
1265 | .maxlen = sizeof(int), | |
1266 | .mode = 0644, | |
1267 | .proc_handler = &proc_dointvec, | |
1268 | }, | |
1269 | { | |
1270 | .ctl_name = NET_IPV4_CONF_SECURE_REDIRECTS, | |
1271 | .procname = "secure_redirects", | |
1272 | .data = &ipv4_devconf.secure_redirects, | |
1273 | .maxlen = sizeof(int), | |
1274 | .mode = 0644, | |
1275 | .proc_handler = &proc_dointvec, | |
1276 | }, | |
1277 | { | |
1278 | .ctl_name = NET_IPV4_CONF_SHARED_MEDIA, | |
1279 | .procname = "shared_media", | |
1280 | .data = &ipv4_devconf.shared_media, | |
1281 | .maxlen = sizeof(int), | |
1282 | .mode = 0644, | |
1283 | .proc_handler = &proc_dointvec, | |
1284 | }, | |
1285 | { | |
1286 | .ctl_name = NET_IPV4_CONF_RP_FILTER, | |
1287 | .procname = "rp_filter", | |
1288 | .data = &ipv4_devconf.rp_filter, | |
1289 | .maxlen = sizeof(int), | |
1290 | .mode = 0644, | |
1291 | .proc_handler = &proc_dointvec, | |
1292 | }, | |
1293 | { | |
1294 | .ctl_name = NET_IPV4_CONF_SEND_REDIRECTS, | |
1295 | .procname = "send_redirects", | |
1296 | .data = &ipv4_devconf.send_redirects, | |
1297 | .maxlen = sizeof(int), | |
1298 | .mode = 0644, | |
1299 | .proc_handler = &proc_dointvec, | |
1300 | }, | |
1301 | { | |
1302 | .ctl_name = NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE, | |
1303 | .procname = "accept_source_route", | |
1304 | .data = &ipv4_devconf.accept_source_route, | |
1305 | .maxlen = sizeof(int), | |
1306 | .mode = 0644, | |
1307 | .proc_handler = &proc_dointvec, | |
1308 | }, | |
1309 | { | |
1310 | .ctl_name = NET_IPV4_CONF_PROXY_ARP, | |
1311 | .procname = "proxy_arp", | |
1312 | .data = &ipv4_devconf.proxy_arp, | |
1313 | .maxlen = sizeof(int), | |
1314 | .mode = 0644, | |
1315 | .proc_handler = &proc_dointvec, | |
1316 | }, | |
1317 | { | |
1318 | .ctl_name = NET_IPV4_CONF_MEDIUM_ID, | |
1319 | .procname = "medium_id", | |
1320 | .data = &ipv4_devconf.medium_id, | |
1321 | .maxlen = sizeof(int), | |
1322 | .mode = 0644, | |
1323 | .proc_handler = &proc_dointvec, | |
1324 | }, | |
1325 | { | |
1326 | .ctl_name = NET_IPV4_CONF_BOOTP_RELAY, | |
1327 | .procname = "bootp_relay", | |
1328 | .data = &ipv4_devconf.bootp_relay, | |
1329 | .maxlen = sizeof(int), | |
1330 | .mode = 0644, | |
1331 | .proc_handler = &proc_dointvec, | |
1332 | }, | |
1333 | { | |
1334 | .ctl_name = NET_IPV4_CONF_LOG_MARTIANS, | |
1335 | .procname = "log_martians", | |
1336 | .data = &ipv4_devconf.log_martians, | |
1337 | .maxlen = sizeof(int), | |
1338 | .mode = 0644, | |
1339 | .proc_handler = &proc_dointvec, | |
1340 | }, | |
1341 | { | |
1342 | .ctl_name = NET_IPV4_CONF_TAG, | |
1343 | .procname = "tag", | |
1344 | .data = &ipv4_devconf.tag, | |
1345 | .maxlen = sizeof(int), | |
1346 | .mode = 0644, | |
1347 | .proc_handler = &proc_dointvec, | |
1348 | }, | |
1349 | { | |
1350 | .ctl_name = NET_IPV4_CONF_ARPFILTER, | |
1351 | .procname = "arp_filter", | |
1352 | .data = &ipv4_devconf.arp_filter, | |
1353 | .maxlen = sizeof(int), | |
1354 | .mode = 0644, | |
1355 | .proc_handler = &proc_dointvec, | |
1356 | }, | |
1357 | { | |
1358 | .ctl_name = NET_IPV4_CONF_ARP_ANNOUNCE, | |
1359 | .procname = "arp_announce", | |
1360 | .data = &ipv4_devconf.arp_announce, | |
1361 | .maxlen = sizeof(int), | |
1362 | .mode = 0644, | |
1363 | .proc_handler = &proc_dointvec, | |
1364 | }, | |
1365 | { | |
1366 | .ctl_name = NET_IPV4_CONF_ARP_IGNORE, | |
1367 | .procname = "arp_ignore", | |
1368 | .data = &ipv4_devconf.arp_ignore, | |
1369 | .maxlen = sizeof(int), | |
1370 | .mode = 0644, | |
1371 | .proc_handler = &proc_dointvec, | |
1372 | }, | |
1373 | { | |
1374 | .ctl_name = NET_IPV4_CONF_NOXFRM, | |
1375 | .procname = "disable_xfrm", | |
1376 | .data = &ipv4_devconf.no_xfrm, | |
1377 | .maxlen = sizeof(int), | |
1378 | .mode = 0644, | |
1379 | .proc_handler = &ipv4_doint_and_flush, | |
1380 | .strategy = &ipv4_doint_and_flush_strategy, | |
1381 | }, | |
1382 | { | |
1383 | .ctl_name = NET_IPV4_CONF_NOPOLICY, | |
1384 | .procname = "disable_policy", | |
1385 | .data = &ipv4_devconf.no_policy, | |
1386 | .maxlen = sizeof(int), | |
1387 | .mode = 0644, | |
1388 | .proc_handler = &ipv4_doint_and_flush, | |
1389 | .strategy = &ipv4_doint_and_flush_strategy, | |
1390 | }, | |
1391 | { | |
1392 | .ctl_name = NET_IPV4_CONF_FORCE_IGMP_VERSION, | |
1393 | .procname = "force_igmp_version", | |
1394 | .data = &ipv4_devconf.force_igmp_version, | |
1395 | .maxlen = sizeof(int), | |
1396 | .mode = 0644, | |
8f937c60 HW |
1397 | .proc_handler = &ipv4_doint_and_flush, |
1398 | .strategy = &ipv4_doint_and_flush_strategy, | |
1399 | }, | |
1400 | { | |
1401 | .ctl_name = NET_IPV4_CONF_PROMOTE_SECONDARIES, | |
1402 | .procname = "promote_secondaries", | |
1403 | .data = &ipv4_devconf.promote_secondaries, | |
1404 | .maxlen = sizeof(int), | |
1405 | .mode = 0644, | |
1da177e4 LT |
1406 | .proc_handler = &ipv4_doint_and_flush, |
1407 | .strategy = &ipv4_doint_and_flush_strategy, | |
1408 | }, | |
1409 | }, | |
1410 | .devinet_dev = { | |
1411 | { | |
1412 | .ctl_name = NET_PROTO_CONF_ALL, | |
1413 | .procname = "all", | |
1414 | .mode = 0555, | |
1415 | .child = devinet_sysctl.devinet_vars, | |
1416 | }, | |
1417 | }, | |
1418 | .devinet_conf_dir = { | |
1419 | { | |
1420 | .ctl_name = NET_IPV4_CONF, | |
1421 | .procname = "conf", | |
1422 | .mode = 0555, | |
1423 | .child = devinet_sysctl.devinet_dev, | |
1424 | }, | |
1425 | }, | |
1426 | .devinet_proto_dir = { | |
1427 | { | |
1428 | .ctl_name = NET_IPV4, | |
1429 | .procname = "ipv4", | |
1430 | .mode = 0555, | |
1431 | .child = devinet_sysctl.devinet_conf_dir, | |
1432 | }, | |
1433 | }, | |
1434 | .devinet_root_dir = { | |
1435 | { | |
1436 | .ctl_name = CTL_NET, | |
1437 | .procname = "net", | |
1438 | .mode = 0555, | |
1439 | .child = devinet_sysctl.devinet_proto_dir, | |
1440 | }, | |
1441 | }, | |
1442 | }; | |
1443 | ||
1444 | static void devinet_sysctl_register(struct in_device *in_dev, | |
1445 | struct ipv4_devconf *p) | |
1446 | { | |
1447 | int i; | |
1448 | struct net_device *dev = in_dev ? in_dev->dev : NULL; | |
1449 | struct devinet_sysctl_table *t = kmalloc(sizeof(*t), GFP_KERNEL); | |
1450 | char *dev_name = NULL; | |
1451 | ||
1452 | if (!t) | |
1453 | return; | |
1454 | memcpy(t, &devinet_sysctl, sizeof(*t)); | |
1455 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { | |
1456 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
1457 | t->devinet_vars[i].de = NULL; | |
1458 | } | |
1459 | ||
1460 | if (dev) { | |
1461 | dev_name = dev->name; | |
1462 | t->devinet_dev[0].ctl_name = dev->ifindex; | |
1463 | } else { | |
1464 | dev_name = "default"; | |
1465 | t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; | |
1466 | } | |
1467 | ||
1468 | /* | |
1469 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1470 | * by sysctl and we wouldn't want anyone to change it under our feet | |
1471 | * (see SIOCSIFNAME). | |
1472 | */ | |
543537bd | 1473 | dev_name = kstrdup(dev_name, GFP_KERNEL); |
1da177e4 LT |
1474 | if (!dev_name) |
1475 | goto free; | |
1476 | ||
1477 | t->devinet_dev[0].procname = dev_name; | |
1478 | t->devinet_dev[0].child = t->devinet_vars; | |
1479 | t->devinet_dev[0].de = NULL; | |
1480 | t->devinet_conf_dir[0].child = t->devinet_dev; | |
1481 | t->devinet_conf_dir[0].de = NULL; | |
1482 | t->devinet_proto_dir[0].child = t->devinet_conf_dir; | |
1483 | t->devinet_proto_dir[0].de = NULL; | |
1484 | t->devinet_root_dir[0].child = t->devinet_proto_dir; | |
1485 | t->devinet_root_dir[0].de = NULL; | |
1486 | ||
1487 | t->sysctl_header = register_sysctl_table(t->devinet_root_dir, 0); | |
1488 | if (!t->sysctl_header) | |
1489 | goto free_procname; | |
1490 | ||
1491 | p->sysctl = t; | |
1492 | return; | |
1493 | ||
1494 | /* error path */ | |
1495 | free_procname: | |
1496 | kfree(dev_name); | |
1497 | free: | |
1498 | kfree(t); | |
1499 | return; | |
1500 | } | |
1501 | ||
1502 | static void devinet_sysctl_unregister(struct ipv4_devconf *p) | |
1503 | { | |
1504 | if (p->sysctl) { | |
1505 | struct devinet_sysctl_table *t = p->sysctl; | |
1506 | p->sysctl = NULL; | |
1507 | unregister_sysctl_table(t->sysctl_header); | |
1508 | kfree(t->devinet_dev[0].procname); | |
1509 | kfree(t); | |
1510 | } | |
1511 | } | |
1512 | #endif | |
1513 | ||
1514 | void __init devinet_init(void) | |
1515 | { | |
1516 | register_gifconf(PF_INET, inet_gifconf); | |
1517 | register_netdevice_notifier(&ip_netdev_notifier); | |
1518 | rtnetlink_links[PF_INET] = inet_rtnetlink_table; | |
1519 | #ifdef CONFIG_SYSCTL | |
1520 | devinet_sysctl.sysctl_header = | |
1521 | register_sysctl_table(devinet_sysctl.devinet_root_dir, 0); | |
1522 | devinet_sysctl_register(NULL, &ipv4_devconf_dflt); | |
1523 | #endif | |
1524 | } | |
1525 | ||
1526 | EXPORT_SYMBOL(devinet_ioctl); | |
1527 | EXPORT_SYMBOL(in_dev_finish_destroy); | |
1528 | EXPORT_SYMBOL(inet_select_addr); | |
1529 | EXPORT_SYMBOL(inetdev_by_index); | |
1530 | EXPORT_SYMBOL(register_inetaddr_notifier); | |
1531 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |