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spi: core: Do not mangle error code from kthread_run()
[deliverable/linux.git] / net / bridge / br_netlink.c
1 /*
2 * Bridge netlink control interface
3 *
4 * Authors:
5 * Stephen Hemminger <shemminger@osdl.org>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/etherdevice.h>
16 #include <net/rtnetlink.h>
17 #include <net/net_namespace.h>
18 #include <net/sock.h>
19 #include <uapi/linux/if_bridge.h>
20
21 #include "br_private.h"
22 #include "br_private_stp.h"
23
24 static inline size_t br_port_info_size(void)
25 {
26 return nla_total_size(1) /* IFLA_BRPORT_STATE */
27 + nla_total_size(2) /* IFLA_BRPORT_PRIORITY */
28 + nla_total_size(4) /* IFLA_BRPORT_COST */
29 + nla_total_size(1) /* IFLA_BRPORT_MODE */
30 + nla_total_size(1) /* IFLA_BRPORT_GUARD */
31 + nla_total_size(1) /* IFLA_BRPORT_PROTECT */
32 + nla_total_size(1) /* IFLA_BRPORT_FAST_LEAVE */
33 + nla_total_size(1) /* IFLA_BRPORT_LEARNING */
34 + nla_total_size(1) /* IFLA_BRPORT_UNICAST_FLOOD */
35 + 0;
36 }
37
38 static inline size_t br_nlmsg_size(void)
39 {
40 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
41 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
42 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
43 + nla_total_size(4) /* IFLA_MASTER */
44 + nla_total_size(4) /* IFLA_MTU */
45 + nla_total_size(4) /* IFLA_LINK */
46 + nla_total_size(1) /* IFLA_OPERSTATE */
47 + nla_total_size(br_port_info_size()); /* IFLA_PROTINFO */
48 }
49
50 static int br_port_fill_attrs(struct sk_buff *skb,
51 const struct net_bridge_port *p)
52 {
53 u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
54
55 if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
56 nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
57 nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
58 nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
59 nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
60 nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
61 nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
62 nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
63 nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)))
64 return -EMSGSIZE;
65
66 return 0;
67 }
68
69 /*
70 * Create one netlink message for one interface
71 * Contains port and master info as well as carrier and bridge state.
72 */
73 static int br_fill_ifinfo(struct sk_buff *skb,
74 const struct net_bridge_port *port,
75 u32 pid, u32 seq, int event, unsigned int flags,
76 u32 filter_mask, const struct net_device *dev)
77 {
78 const struct net_bridge *br;
79 struct ifinfomsg *hdr;
80 struct nlmsghdr *nlh;
81 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
82
83 if (port)
84 br = port->br;
85 else
86 br = netdev_priv(dev);
87
88 br_debug(br, "br_fill_info event %d port %s master %s\n",
89 event, dev->name, br->dev->name);
90
91 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
92 if (nlh == NULL)
93 return -EMSGSIZE;
94
95 hdr = nlmsg_data(nlh);
96 hdr->ifi_family = AF_BRIDGE;
97 hdr->__ifi_pad = 0;
98 hdr->ifi_type = dev->type;
99 hdr->ifi_index = dev->ifindex;
100 hdr->ifi_flags = dev_get_flags(dev);
101 hdr->ifi_change = 0;
102
103 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
104 nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
105 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
106 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
107 (dev->addr_len &&
108 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
109 (dev->ifindex != dev->iflink &&
110 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
111 goto nla_put_failure;
112
113 if (event == RTM_NEWLINK && port) {
114 struct nlattr *nest
115 = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
116
117 if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
118 goto nla_put_failure;
119 nla_nest_end(skb, nest);
120 }
121
122 /* Check if the VID information is requested */
123 if (filter_mask & RTEXT_FILTER_BRVLAN) {
124 struct nlattr *af;
125 const struct net_port_vlans *pv;
126 struct bridge_vlan_info vinfo;
127 u16 vid;
128 u16 pvid;
129
130 if (port)
131 pv = nbp_get_vlan_info(port);
132 else
133 pv = br_get_vlan_info(br);
134
135 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
136 goto done;
137
138 af = nla_nest_start(skb, IFLA_AF_SPEC);
139 if (!af)
140 goto nla_put_failure;
141
142 pvid = br_get_pvid(pv);
143 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
144 vinfo.vid = vid;
145 vinfo.flags = 0;
146 if (vid == pvid)
147 vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
148
149 if (test_bit(vid, pv->untagged_bitmap))
150 vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
151
152 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
153 sizeof(vinfo), &vinfo))
154 goto nla_put_failure;
155 }
156
157 nla_nest_end(skb, af);
158 }
159
160 done:
161 return nlmsg_end(skb, nlh);
162
163 nla_put_failure:
164 nlmsg_cancel(skb, nlh);
165 return -EMSGSIZE;
166 }
167
168 /*
169 * Notify listeners of a change in port information
170 */
171 void br_ifinfo_notify(int event, struct net_bridge_port *port)
172 {
173 struct net *net;
174 struct sk_buff *skb;
175 int err = -ENOBUFS;
176
177 if (!port)
178 return;
179
180 net = dev_net(port->dev);
181 br_debug(port->br, "port %u(%s) event %d\n",
182 (unsigned int)port->port_no, port->dev->name, event);
183
184 skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
185 if (skb == NULL)
186 goto errout;
187
188 err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
189 if (err < 0) {
190 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
191 WARN_ON(err == -EMSGSIZE);
192 kfree_skb(skb);
193 goto errout;
194 }
195 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
196 return;
197 errout:
198 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
199 }
200
201
202 /*
203 * Dump information about all ports, in response to GETLINK
204 */
205 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
206 struct net_device *dev, u32 filter_mask)
207 {
208 int err = 0;
209 struct net_bridge_port *port = br_port_get_rtnl(dev);
210
211 if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN))
212 goto out;
213
214 err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI,
215 filter_mask, dev);
216 out:
217 return err;
218 }
219
220 static const struct nla_policy ifla_br_policy[IFLA_MAX+1] = {
221 [IFLA_BRIDGE_FLAGS] = { .type = NLA_U16 },
222 [IFLA_BRIDGE_MODE] = { .type = NLA_U16 },
223 [IFLA_BRIDGE_VLAN_INFO] = { .type = NLA_BINARY,
224 .len = sizeof(struct bridge_vlan_info), },
225 };
226
227 static int br_afspec(struct net_bridge *br,
228 struct net_bridge_port *p,
229 struct nlattr *af_spec,
230 int cmd)
231 {
232 struct nlattr *tb[IFLA_BRIDGE_MAX+1];
233 int err = 0;
234
235 err = nla_parse_nested(tb, IFLA_BRIDGE_MAX, af_spec, ifla_br_policy);
236 if (err)
237 return err;
238
239 if (tb[IFLA_BRIDGE_VLAN_INFO]) {
240 struct bridge_vlan_info *vinfo;
241
242 vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]);
243
244 if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
245 return -EINVAL;
246
247 switch (cmd) {
248 case RTM_SETLINK:
249 if (p) {
250 err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
251 if (err)
252 break;
253
254 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
255 err = br_vlan_add(p->br, vinfo->vid,
256 vinfo->flags);
257 } else
258 err = br_vlan_add(br, vinfo->vid, vinfo->flags);
259
260 break;
261
262 case RTM_DELLINK:
263 if (p) {
264 nbp_vlan_delete(p, vinfo->vid);
265 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
266 br_vlan_delete(p->br, vinfo->vid);
267 } else
268 br_vlan_delete(br, vinfo->vid);
269 break;
270 }
271 }
272
273 return err;
274 }
275
276 static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
277 [IFLA_BRPORT_STATE] = { .type = NLA_U8 },
278 [IFLA_BRPORT_COST] = { .type = NLA_U32 },
279 [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
280 [IFLA_BRPORT_MODE] = { .type = NLA_U8 },
281 [IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
282 [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
283 [IFLA_BRPORT_LEARNING] = { .type = NLA_U8 },
284 [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
285 };
286
287 /* Change the state of the port and notify spanning tree */
288 static int br_set_port_state(struct net_bridge_port *p, u8 state)
289 {
290 if (state > BR_STATE_BLOCKING)
291 return -EINVAL;
292
293 /* if kernel STP is running, don't allow changes */
294 if (p->br->stp_enabled == BR_KERNEL_STP)
295 return -EBUSY;
296
297 /* if device is not up, change is not allowed
298 * if link is not present, only allowable state is disabled
299 */
300 if (!netif_running(p->dev) ||
301 (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
302 return -ENETDOWN;
303
304 br_set_state(p, state);
305 br_log_state(p);
306 br_port_state_selection(p->br);
307 return 0;
308 }
309
310 /* Set/clear or port flags based on attribute */
311 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
312 int attrtype, unsigned long mask)
313 {
314 if (tb[attrtype]) {
315 u8 flag = nla_get_u8(tb[attrtype]);
316 if (flag)
317 p->flags |= mask;
318 else
319 p->flags &= ~mask;
320 }
321 }
322
323 /* Process bridge protocol info on port */
324 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
325 {
326 int err;
327 unsigned long old_flags = p->flags;
328
329 br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
330 br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
331 br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
332 br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
333 br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
334 br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
335
336 if (tb[IFLA_BRPORT_COST]) {
337 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
338 if (err)
339 return err;
340 }
341
342 if (tb[IFLA_BRPORT_PRIORITY]) {
343 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
344 if (err)
345 return err;
346 }
347
348 if (tb[IFLA_BRPORT_STATE]) {
349 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
350 if (err)
351 return err;
352 }
353
354 br_port_flags_change(p, old_flags ^ p->flags);
355 return 0;
356 }
357
358 /* Change state and parameters on port. */
359 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
360 {
361 struct nlattr *protinfo;
362 struct nlattr *afspec;
363 struct net_bridge_port *p;
364 struct nlattr *tb[IFLA_BRPORT_MAX + 1];
365 int err = 0;
366
367 protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
368 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
369 if (!protinfo && !afspec)
370 return 0;
371
372 p = br_port_get_rtnl(dev);
373 /* We want to accept dev as bridge itself if the AF_SPEC
374 * is set to see if someone is setting vlan info on the bridge
375 */
376 if (!p && !afspec)
377 return -EINVAL;
378
379 if (p && protinfo) {
380 if (protinfo->nla_type & NLA_F_NESTED) {
381 err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
382 protinfo, br_port_policy);
383 if (err)
384 return err;
385
386 spin_lock_bh(&p->br->lock);
387 err = br_setport(p, tb);
388 spin_unlock_bh(&p->br->lock);
389 } else {
390 /* Binary compatibility with old RSTP */
391 if (nla_len(protinfo) < sizeof(u8))
392 return -EINVAL;
393
394 spin_lock_bh(&p->br->lock);
395 err = br_set_port_state(p, nla_get_u8(protinfo));
396 spin_unlock_bh(&p->br->lock);
397 }
398 if (err)
399 goto out;
400 }
401
402 if (afspec) {
403 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
404 afspec, RTM_SETLINK);
405 }
406
407 if (err == 0)
408 br_ifinfo_notify(RTM_NEWLINK, p);
409
410 out:
411 return err;
412 }
413
414 /* Delete port information */
415 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh)
416 {
417 struct nlattr *afspec;
418 struct net_bridge_port *p;
419 int err;
420
421 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
422 if (!afspec)
423 return 0;
424
425 p = br_port_get_rtnl(dev);
426 /* We want to accept dev as bridge itself as well */
427 if (!p && !(dev->priv_flags & IFF_EBRIDGE))
428 return -EINVAL;
429
430 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
431 afspec, RTM_DELLINK);
432
433 return err;
434 }
435 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
436 {
437 if (tb[IFLA_ADDRESS]) {
438 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
439 return -EINVAL;
440 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
441 return -EADDRNOTAVAIL;
442 }
443
444 return 0;
445 }
446
447 static int br_dev_newlink(struct net *src_net, struct net_device *dev,
448 struct nlattr *tb[], struct nlattr *data[])
449 {
450 struct net_bridge *br = netdev_priv(dev);
451
452 if (tb[IFLA_ADDRESS]) {
453 spin_lock_bh(&br->lock);
454 br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
455 spin_unlock_bh(&br->lock);
456 }
457
458 return register_netdevice(dev);
459 }
460
461 static int br_port_slave_changelink(struct net_device *brdev,
462 struct net_device *dev,
463 struct nlattr *tb[],
464 struct nlattr *data[])
465 {
466 if (!data)
467 return 0;
468 return br_setport(br_port_get_rtnl(dev), data);
469 }
470
471 static int br_port_fill_slave_info(struct sk_buff *skb,
472 const struct net_device *brdev,
473 const struct net_device *dev)
474 {
475 return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
476 }
477
478 static size_t br_port_get_slave_size(const struct net_device *brdev,
479 const struct net_device *dev)
480 {
481 return br_port_info_size();
482 }
483
484 static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
485 [IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 },
486 [IFLA_BR_HELLO_TIME] = { .type = NLA_U32 },
487 [IFLA_BR_MAX_AGE] = { .type = NLA_U32 },
488 };
489
490 static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
491 struct nlattr *data[])
492 {
493 struct net_bridge *br = netdev_priv(brdev);
494 int err;
495
496 if (!data)
497 return 0;
498
499 if (data[IFLA_BR_FORWARD_DELAY]) {
500 err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
501 if (err)
502 return err;
503 }
504
505 if (data[IFLA_BR_HELLO_TIME]) {
506 err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
507 if (err)
508 return err;
509 }
510
511 if (data[IFLA_BR_MAX_AGE]) {
512 err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
513 if (err)
514 return err;
515 }
516
517 return 0;
518 }
519
520 static size_t br_get_size(const struct net_device *brdev)
521 {
522 return nla_total_size(sizeof(u32)) + /* IFLA_BR_FORWARD_DELAY */
523 nla_total_size(sizeof(u32)) + /* IFLA_BR_HELLO_TIME */
524 nla_total_size(sizeof(u32)) + /* IFLA_BR_MAX_AGE */
525 0;
526 }
527
528 static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
529 {
530 struct net_bridge *br = netdev_priv(brdev);
531 u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
532 u32 hello_time = jiffies_to_clock_t(br->hello_time);
533 u32 age_time = jiffies_to_clock_t(br->max_age);
534
535 if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) ||
536 nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) ||
537 nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time))
538 return -EMSGSIZE;
539
540 return 0;
541 }
542
543 static size_t br_get_link_af_size(const struct net_device *dev)
544 {
545 struct net_port_vlans *pv;
546
547 if (br_port_exists(dev))
548 pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
549 else if (dev->priv_flags & IFF_EBRIDGE)
550 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
551 else
552 return 0;
553
554 if (!pv)
555 return 0;
556
557 /* Each VLAN is returned in bridge_vlan_info along with flags */
558 return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
559 }
560
561 static struct rtnl_af_ops br_af_ops = {
562 .family = AF_BRIDGE,
563 .get_link_af_size = br_get_link_af_size,
564 };
565
566 struct rtnl_link_ops br_link_ops __read_mostly = {
567 .kind = "bridge",
568 .priv_size = sizeof(struct net_bridge),
569 .setup = br_dev_setup,
570 .maxtype = IFLA_BRPORT_MAX,
571 .policy = br_policy,
572 .validate = br_validate,
573 .newlink = br_dev_newlink,
574 .changelink = br_changelink,
575 .dellink = br_dev_delete,
576 .get_size = br_get_size,
577 .fill_info = br_fill_info,
578
579 .slave_maxtype = IFLA_BRPORT_MAX,
580 .slave_policy = br_port_policy,
581 .slave_changelink = br_port_slave_changelink,
582 .get_slave_size = br_port_get_slave_size,
583 .fill_slave_info = br_port_fill_slave_info,
584 };
585
586 int __init br_netlink_init(void)
587 {
588 int err;
589
590 br_mdb_init();
591 rtnl_af_register(&br_af_ops);
592
593 err = rtnl_link_register(&br_link_ops);
594 if (err)
595 goto out_af;
596
597 return 0;
598
599 out_af:
600 rtnl_af_unregister(&br_af_ops);
601 br_mdb_uninit();
602 return err;
603 }
604
605 void br_netlink_fini(void)
606 {
607 br_mdb_uninit();
608 rtnl_af_unregister(&br_af_ops);
609 rtnl_link_unregister(&br_link_ops);
610 }
Linux kernel - Deliverables
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