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[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 nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)))
65 return -EMSGSIZE;
66
67 return 0;
68 }
69
70 /*
71 * Create one netlink message for one interface
72 * Contains port and master info as well as carrier and bridge state.
73 */
74 static int br_fill_ifinfo(struct sk_buff *skb,
75 const struct net_bridge_port *port,
76 u32 pid, u32 seq, int event, unsigned int flags,
77 u32 filter_mask, const struct net_device *dev)
78 {
79 const struct net_bridge *br;
80 struct ifinfomsg *hdr;
81 struct nlmsghdr *nlh;
82 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
83
84 if (port)
85 br = port->br;
86 else
87 br = netdev_priv(dev);
88
89 br_debug(br, "br_fill_info event %d port %s master %s\n",
90 event, dev->name, br->dev->name);
91
92 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
93 if (nlh == NULL)
94 return -EMSGSIZE;
95
96 hdr = nlmsg_data(nlh);
97 hdr->ifi_family = AF_BRIDGE;
98 hdr->__ifi_pad = 0;
99 hdr->ifi_type = dev->type;
100 hdr->ifi_index = dev->ifindex;
101 hdr->ifi_flags = dev_get_flags(dev);
102 hdr->ifi_change = 0;
103
104 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
105 nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
106 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
107 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
108 (dev->addr_len &&
109 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
110 (dev->ifindex != dev->iflink &&
111 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
112 goto nla_put_failure;
113
114 if (event == RTM_NEWLINK && port) {
115 struct nlattr *nest
116 = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
117
118 if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
119 goto nla_put_failure;
120 nla_nest_end(skb, nest);
121 }
122
123 /* Check if the VID information is requested */
124 if (filter_mask & RTEXT_FILTER_BRVLAN) {
125 struct nlattr *af;
126 const struct net_port_vlans *pv;
127 struct bridge_vlan_info vinfo;
128 u16 vid;
129 u16 pvid;
130
131 if (port)
132 pv = nbp_get_vlan_info(port);
133 else
134 pv = br_get_vlan_info(br);
135
136 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
137 goto done;
138
139 af = nla_nest_start(skb, IFLA_AF_SPEC);
140 if (!af)
141 goto nla_put_failure;
142
143 pvid = br_get_pvid(pv);
144 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
145 vinfo.vid = vid;
146 vinfo.flags = 0;
147 if (vid == pvid)
148 vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
149
150 if (test_bit(vid, pv->untagged_bitmap))
151 vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
152
153 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
154 sizeof(vinfo), &vinfo))
155 goto nla_put_failure;
156 }
157
158 nla_nest_end(skb, af);
159 }
160
161 done:
162 return nlmsg_end(skb, nlh);
163
164 nla_put_failure:
165 nlmsg_cancel(skb, nlh);
166 return -EMSGSIZE;
167 }
168
169 /*
170 * Notify listeners of a change in port information
171 */
172 void br_ifinfo_notify(int event, struct net_bridge_port *port)
173 {
174 struct net *net;
175 struct sk_buff *skb;
176 int err = -ENOBUFS;
177
178 if (!port)
179 return;
180
181 net = dev_net(port->dev);
182 br_debug(port->br, "port %u(%s) event %d\n",
183 (unsigned int)port->port_no, port->dev->name, event);
184
185 skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
186 if (skb == NULL)
187 goto errout;
188
189 err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
190 if (err < 0) {
191 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
192 WARN_ON(err == -EMSGSIZE);
193 kfree_skb(skb);
194 goto errout;
195 }
196 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
197 return;
198 errout:
199 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
200 }
201
202
203 /*
204 * Dump information about all ports, in response to GETLINK
205 */
206 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
207 struct net_device *dev, u32 filter_mask)
208 {
209 int err = 0;
210 struct net_bridge_port *port = br_port_get_rtnl(dev);
211
212 if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN))
213 goto out;
214
215 err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI,
216 filter_mask, dev);
217 out:
218 return err;
219 }
220
221 static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p,
222 int cmd, struct bridge_vlan_info *vinfo)
223 {
224 int err = 0;
225
226 switch (cmd) {
227 case RTM_SETLINK:
228 if (p) {
229 err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
230 if (err)
231 break;
232
233 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
234 err = br_vlan_add(p->br, vinfo->vid,
235 vinfo->flags);
236 } else {
237 err = br_vlan_add(br, vinfo->vid, vinfo->flags);
238 }
239 break;
240
241 case RTM_DELLINK:
242 if (p) {
243 nbp_vlan_delete(p, vinfo->vid);
244 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
245 br_vlan_delete(p->br, vinfo->vid);
246 } else {
247 br_vlan_delete(br, vinfo->vid);
248 }
249 break;
250 }
251
252 return err;
253 }
254
255 static int br_afspec(struct net_bridge *br,
256 struct net_bridge_port *p,
257 struct nlattr *af_spec,
258 int cmd)
259 {
260 struct bridge_vlan_info *vinfo_start = NULL;
261 struct bridge_vlan_info *vinfo = NULL;
262 struct nlattr *attr;
263 int err = 0;
264 int rem;
265
266 nla_for_each_nested(attr, af_spec, rem) {
267 if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
268 continue;
269 if (nla_len(attr) != sizeof(struct bridge_vlan_info))
270 return -EINVAL;
271 vinfo = nla_data(attr);
272 if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
273 if (vinfo_start)
274 return -EINVAL;
275 vinfo_start = vinfo;
276 continue;
277 }
278
279 if (vinfo_start) {
280 struct bridge_vlan_info tmp_vinfo;
281 int v;
282
283 if (!(vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END))
284 return -EINVAL;
285
286 if (vinfo->vid <= vinfo_start->vid)
287 return -EINVAL;
288
289 memcpy(&tmp_vinfo, vinfo_start,
290 sizeof(struct bridge_vlan_info));
291
292 for (v = vinfo_start->vid; v <= vinfo->vid; v++) {
293 tmp_vinfo.vid = v;
294 err = br_vlan_info(br, p, cmd, &tmp_vinfo);
295 if (err)
296 break;
297 }
298 vinfo_start = NULL;
299 } else {
300 err = br_vlan_info(br, p, cmd, vinfo);
301 }
302 if (err)
303 break;
304 }
305
306 return err;
307 }
308
309 static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
310 [IFLA_BRPORT_STATE] = { .type = NLA_U8 },
311 [IFLA_BRPORT_COST] = { .type = NLA_U32 },
312 [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
313 [IFLA_BRPORT_MODE] = { .type = NLA_U8 },
314 [IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
315 [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
316 [IFLA_BRPORT_FAST_LEAVE]= { .type = NLA_U8 },
317 [IFLA_BRPORT_LEARNING] = { .type = NLA_U8 },
318 [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
319 };
320
321 /* Change the state of the port and notify spanning tree */
322 static int br_set_port_state(struct net_bridge_port *p, u8 state)
323 {
324 if (state > BR_STATE_BLOCKING)
325 return -EINVAL;
326
327 /* if kernel STP is running, don't allow changes */
328 if (p->br->stp_enabled == BR_KERNEL_STP)
329 return -EBUSY;
330
331 /* if device is not up, change is not allowed
332 * if link is not present, only allowable state is disabled
333 */
334 if (!netif_running(p->dev) ||
335 (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
336 return -ENETDOWN;
337
338 br_set_state(p, state);
339 br_log_state(p);
340 br_port_state_selection(p->br);
341 return 0;
342 }
343
344 /* Set/clear or port flags based on attribute */
345 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
346 int attrtype, unsigned long mask)
347 {
348 if (tb[attrtype]) {
349 u8 flag = nla_get_u8(tb[attrtype]);
350 if (flag)
351 p->flags |= mask;
352 else
353 p->flags &= ~mask;
354 }
355 }
356
357 /* Process bridge protocol info on port */
358 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
359 {
360 int err;
361 unsigned long old_flags = p->flags;
362
363 br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
364 br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
365 br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
366 br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
367 br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
368 br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
369 br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
370
371 if (tb[IFLA_BRPORT_COST]) {
372 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
373 if (err)
374 return err;
375 }
376
377 if (tb[IFLA_BRPORT_PRIORITY]) {
378 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
379 if (err)
380 return err;
381 }
382
383 if (tb[IFLA_BRPORT_STATE]) {
384 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
385 if (err)
386 return err;
387 }
388
389 br_port_flags_change(p, old_flags ^ p->flags);
390 return 0;
391 }
392
393 /* Change state and parameters on port. */
394 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
395 {
396 struct nlattr *protinfo;
397 struct nlattr *afspec;
398 struct net_bridge_port *p;
399 struct nlattr *tb[IFLA_BRPORT_MAX + 1];
400 int err = 0;
401
402 protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
403 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
404 if (!protinfo && !afspec)
405 return 0;
406
407 p = br_port_get_rtnl(dev);
408 /* We want to accept dev as bridge itself if the AF_SPEC
409 * is set to see if someone is setting vlan info on the bridge
410 */
411 if (!p && !afspec)
412 return -EINVAL;
413
414 if (p && protinfo) {
415 if (protinfo->nla_type & NLA_F_NESTED) {
416 err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
417 protinfo, br_port_policy);
418 if (err)
419 return err;
420
421 spin_lock_bh(&p->br->lock);
422 err = br_setport(p, tb);
423 spin_unlock_bh(&p->br->lock);
424 } else {
425 /* Binary compatibility with old RSTP */
426 if (nla_len(protinfo) < sizeof(u8))
427 return -EINVAL;
428
429 spin_lock_bh(&p->br->lock);
430 err = br_set_port_state(p, nla_get_u8(protinfo));
431 spin_unlock_bh(&p->br->lock);
432 }
433 if (err)
434 goto out;
435 }
436
437 if (afspec) {
438 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
439 afspec, RTM_SETLINK);
440 }
441
442 if (err == 0)
443 br_ifinfo_notify(RTM_NEWLINK, p);
444
445 out:
446 return err;
447 }
448
449 /* Delete port information */
450 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh)
451 {
452 struct nlattr *afspec;
453 struct net_bridge_port *p;
454 int err;
455
456 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
457 if (!afspec)
458 return 0;
459
460 p = br_port_get_rtnl(dev);
461 /* We want to accept dev as bridge itself as well */
462 if (!p && !(dev->priv_flags & IFF_EBRIDGE))
463 return -EINVAL;
464
465 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
466 afspec, RTM_DELLINK);
467
468 return err;
469 }
470 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
471 {
472 if (tb[IFLA_ADDRESS]) {
473 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
474 return -EINVAL;
475 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
476 return -EADDRNOTAVAIL;
477 }
478
479 return 0;
480 }
481
482 static int br_dev_newlink(struct net *src_net, struct net_device *dev,
483 struct nlattr *tb[], struct nlattr *data[])
484 {
485 struct net_bridge *br = netdev_priv(dev);
486
487 if (tb[IFLA_ADDRESS]) {
488 spin_lock_bh(&br->lock);
489 br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
490 spin_unlock_bh(&br->lock);
491 }
492
493 return register_netdevice(dev);
494 }
495
496 static int br_port_slave_changelink(struct net_device *brdev,
497 struct net_device *dev,
498 struct nlattr *tb[],
499 struct nlattr *data[])
500 {
501 if (!data)
502 return 0;
503 return br_setport(br_port_get_rtnl(dev), data);
504 }
505
506 static int br_port_fill_slave_info(struct sk_buff *skb,
507 const struct net_device *brdev,
508 const struct net_device *dev)
509 {
510 return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
511 }
512
513 static size_t br_port_get_slave_size(const struct net_device *brdev,
514 const struct net_device *dev)
515 {
516 return br_port_info_size();
517 }
518
519 static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
520 [IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 },
521 [IFLA_BR_HELLO_TIME] = { .type = NLA_U32 },
522 [IFLA_BR_MAX_AGE] = { .type = NLA_U32 },
523 };
524
525 static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
526 struct nlattr *data[])
527 {
528 struct net_bridge *br = netdev_priv(brdev);
529 int err;
530
531 if (!data)
532 return 0;
533
534 if (data[IFLA_BR_FORWARD_DELAY]) {
535 err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
536 if (err)
537 return err;
538 }
539
540 if (data[IFLA_BR_HELLO_TIME]) {
541 err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
542 if (err)
543 return err;
544 }
545
546 if (data[IFLA_BR_MAX_AGE]) {
547 err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
548 if (err)
549 return err;
550 }
551
552 return 0;
553 }
554
555 static size_t br_get_size(const struct net_device *brdev)
556 {
557 return nla_total_size(sizeof(u32)) + /* IFLA_BR_FORWARD_DELAY */
558 nla_total_size(sizeof(u32)) + /* IFLA_BR_HELLO_TIME */
559 nla_total_size(sizeof(u32)) + /* IFLA_BR_MAX_AGE */
560 0;
561 }
562
563 static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
564 {
565 struct net_bridge *br = netdev_priv(brdev);
566 u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
567 u32 hello_time = jiffies_to_clock_t(br->hello_time);
568 u32 age_time = jiffies_to_clock_t(br->max_age);
569
570 if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) ||
571 nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) ||
572 nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time))
573 return -EMSGSIZE;
574
575 return 0;
576 }
577
578 static size_t br_get_link_af_size(const struct net_device *dev)
579 {
580 struct net_port_vlans *pv;
581
582 if (br_port_exists(dev))
583 pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
584 else if (dev->priv_flags & IFF_EBRIDGE)
585 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
586 else
587 return 0;
588
589 if (!pv)
590 return 0;
591
592 /* Each VLAN is returned in bridge_vlan_info along with flags */
593 return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
594 }
595
596 static struct rtnl_af_ops br_af_ops = {
597 .family = AF_BRIDGE,
598 .get_link_af_size = br_get_link_af_size,
599 };
600
601 struct rtnl_link_ops br_link_ops __read_mostly = {
602 .kind = "bridge",
603 .priv_size = sizeof(struct net_bridge),
604 .setup = br_dev_setup,
605 .maxtype = IFLA_BRPORT_MAX,
606 .policy = br_policy,
607 .validate = br_validate,
608 .newlink = br_dev_newlink,
609 .changelink = br_changelink,
610 .dellink = br_dev_delete,
611 .get_size = br_get_size,
612 .fill_info = br_fill_info,
613
614 .slave_maxtype = IFLA_BRPORT_MAX,
615 .slave_policy = br_port_policy,
616 .slave_changelink = br_port_slave_changelink,
617 .get_slave_size = br_port_get_slave_size,
618 .fill_slave_info = br_port_fill_slave_info,
619 };
620
621 int __init br_netlink_init(void)
622 {
623 int err;
624
625 br_mdb_init();
626 rtnl_af_register(&br_af_ops);
627
628 err = rtnl_link_register(&br_link_ops);
629 if (err)
630 goto out_af;
631
632 return 0;
633
634 out_af:
635 rtnl_af_unregister(&br_af_ops);
636 br_mdb_uninit();
637 return err;
638 }
639
640 void br_netlink_fini(void)
641 {
642 br_mdb_uninit();
643 rtnl_af_unregister(&br_af_ops);
644 rtnl_link_unregister(&br_link_ops);
645 }
Linux kernel - Deliverables
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