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Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm
[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 <net/switchdev.h>
20 #include <uapi/linux/if_bridge.h>
21
22 #include "br_private.h"
23 #include "br_private_stp.h"
24
25 static int br_get_num_vlan_infos(const struct net_port_vlans *pv,
26 u32 filter_mask)
27 {
28 u16 vid_range_start = 0, vid_range_end = 0;
29 u16 vid_range_flags = 0;
30 u16 pvid, vid, flags;
31 int num_vlans = 0;
32
33 if (filter_mask & RTEXT_FILTER_BRVLAN)
34 return pv->num_vlans;
35
36 if (!(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
37 return 0;
38
39 /* Count number of vlan info's
40 */
41 pvid = br_get_pvid(pv);
42 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
43 flags = 0;
44 if (vid == pvid)
45 flags |= BRIDGE_VLAN_INFO_PVID;
46
47 if (test_bit(vid, pv->untagged_bitmap))
48 flags |= BRIDGE_VLAN_INFO_UNTAGGED;
49
50 if (vid_range_start == 0) {
51 goto initvars;
52 } else if ((vid - vid_range_end) == 1 &&
53 flags == vid_range_flags) {
54 vid_range_end = vid;
55 continue;
56 } else {
57 if ((vid_range_end - vid_range_start) > 0)
58 num_vlans += 2;
59 else
60 num_vlans += 1;
61 }
62 initvars:
63 vid_range_start = vid;
64 vid_range_end = vid;
65 vid_range_flags = flags;
66 }
67
68 if (vid_range_start != 0) {
69 if ((vid_range_end - vid_range_start) > 0)
70 num_vlans += 2;
71 else
72 num_vlans += 1;
73 }
74
75 return num_vlans;
76 }
77
78 static size_t br_get_link_af_size_filtered(const struct net_device *dev,
79 u32 filter_mask)
80 {
81 struct net_port_vlans *pv;
82 int num_vlan_infos;
83
84 rcu_read_lock();
85 if (br_port_exists(dev))
86 pv = nbp_get_vlan_info(br_port_get_rcu(dev));
87 else if (dev->priv_flags & IFF_EBRIDGE)
88 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
89 else
90 pv = NULL;
91 if (pv)
92 num_vlan_infos = br_get_num_vlan_infos(pv, filter_mask);
93 else
94 num_vlan_infos = 0;
95 rcu_read_unlock();
96
97 if (!num_vlan_infos)
98 return 0;
99
100 /* Each VLAN is returned in bridge_vlan_info along with flags */
101 return num_vlan_infos * nla_total_size(sizeof(struct bridge_vlan_info));
102 }
103
104 static inline size_t br_port_info_size(void)
105 {
106 return nla_total_size(1) /* IFLA_BRPORT_STATE */
107 + nla_total_size(2) /* IFLA_BRPORT_PRIORITY */
108 + nla_total_size(4) /* IFLA_BRPORT_COST */
109 + nla_total_size(1) /* IFLA_BRPORT_MODE */
110 + nla_total_size(1) /* IFLA_BRPORT_GUARD */
111 + nla_total_size(1) /* IFLA_BRPORT_PROTECT */
112 + nla_total_size(1) /* IFLA_BRPORT_FAST_LEAVE */
113 + nla_total_size(1) /* IFLA_BRPORT_LEARNING */
114 + nla_total_size(1) /* IFLA_BRPORT_UNICAST_FLOOD */
115 + 0;
116 }
117
118 static inline size_t br_nlmsg_size(struct net_device *dev, u32 filter_mask)
119 {
120 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
121 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
122 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
123 + nla_total_size(4) /* IFLA_MASTER */
124 + nla_total_size(4) /* IFLA_MTU */
125 + nla_total_size(4) /* IFLA_LINK */
126 + nla_total_size(1) /* IFLA_OPERSTATE */
127 + nla_total_size(br_port_info_size()) /* IFLA_PROTINFO */
128 + nla_total_size(br_get_link_af_size_filtered(dev,
129 filter_mask)); /* IFLA_AF_SPEC */
130 }
131
132 static int br_port_fill_attrs(struct sk_buff *skb,
133 const struct net_bridge_port *p)
134 {
135 u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
136
137 if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
138 nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
139 nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
140 nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
141 nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
142 nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
143 nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
144 nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
145 nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)) ||
146 nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)) ||
147 nla_put_u8(skb, IFLA_BRPORT_PROXYARP_WIFI,
148 !!(p->flags & BR_PROXYARP_WIFI)))
149 return -EMSGSIZE;
150
151 return 0;
152 }
153
154 static int br_fill_ifvlaninfo_range(struct sk_buff *skb, u16 vid_start,
155 u16 vid_end, u16 flags)
156 {
157 struct bridge_vlan_info vinfo;
158
159 if ((vid_end - vid_start) > 0) {
160 /* add range to skb */
161 vinfo.vid = vid_start;
162 vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_BEGIN;
163 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
164 sizeof(vinfo), &vinfo))
165 goto nla_put_failure;
166
167 vinfo.flags &= ~BRIDGE_VLAN_INFO_RANGE_BEGIN;
168
169 vinfo.vid = vid_end;
170 vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_END;
171 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
172 sizeof(vinfo), &vinfo))
173 goto nla_put_failure;
174 } else {
175 vinfo.vid = vid_start;
176 vinfo.flags = flags;
177 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
178 sizeof(vinfo), &vinfo))
179 goto nla_put_failure;
180 }
181
182 return 0;
183
184 nla_put_failure:
185 return -EMSGSIZE;
186 }
187
188 static int br_fill_ifvlaninfo_compressed(struct sk_buff *skb,
189 const struct net_port_vlans *pv)
190 {
191 u16 vid_range_start = 0, vid_range_end = 0;
192 u16 vid_range_flags = 0;
193 u16 pvid, vid, flags;
194 int err = 0;
195
196 /* Pack IFLA_BRIDGE_VLAN_INFO's for every vlan
197 * and mark vlan info with begin and end flags
198 * if vlaninfo represents a range
199 */
200 pvid = br_get_pvid(pv);
201 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
202 flags = 0;
203 if (vid == pvid)
204 flags |= BRIDGE_VLAN_INFO_PVID;
205
206 if (test_bit(vid, pv->untagged_bitmap))
207 flags |= BRIDGE_VLAN_INFO_UNTAGGED;
208
209 if (vid_range_start == 0) {
210 goto initvars;
211 } else if ((vid - vid_range_end) == 1 &&
212 flags == vid_range_flags) {
213 vid_range_end = vid;
214 continue;
215 } else {
216 err = br_fill_ifvlaninfo_range(skb, vid_range_start,
217 vid_range_end,
218 vid_range_flags);
219 if (err)
220 return err;
221 }
222
223 initvars:
224 vid_range_start = vid;
225 vid_range_end = vid;
226 vid_range_flags = flags;
227 }
228
229 if (vid_range_start != 0) {
230 /* Call it once more to send any left over vlans */
231 err = br_fill_ifvlaninfo_range(skb, vid_range_start,
232 vid_range_end,
233 vid_range_flags);
234 if (err)
235 return err;
236 }
237
238 return 0;
239 }
240
241 static int br_fill_ifvlaninfo(struct sk_buff *skb,
242 const struct net_port_vlans *pv)
243 {
244 struct bridge_vlan_info vinfo;
245 u16 pvid, vid;
246
247 pvid = br_get_pvid(pv);
248 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
249 vinfo.vid = vid;
250 vinfo.flags = 0;
251 if (vid == pvid)
252 vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
253
254 if (test_bit(vid, pv->untagged_bitmap))
255 vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
256
257 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
258 sizeof(vinfo), &vinfo))
259 goto nla_put_failure;
260 }
261
262 return 0;
263
264 nla_put_failure:
265 return -EMSGSIZE;
266 }
267
268 /*
269 * Create one netlink message for one interface
270 * Contains port and master info as well as carrier and bridge state.
271 */
272 static int br_fill_ifinfo(struct sk_buff *skb,
273 const struct net_bridge_port *port,
274 u32 pid, u32 seq, int event, unsigned int flags,
275 u32 filter_mask, const struct net_device *dev)
276 {
277 const struct net_bridge *br;
278 struct ifinfomsg *hdr;
279 struct nlmsghdr *nlh;
280 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
281
282 if (port)
283 br = port->br;
284 else
285 br = netdev_priv(dev);
286
287 br_debug(br, "br_fill_info event %d port %s master %s\n",
288 event, dev->name, br->dev->name);
289
290 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
291 if (nlh == NULL)
292 return -EMSGSIZE;
293
294 hdr = nlmsg_data(nlh);
295 hdr->ifi_family = AF_BRIDGE;
296 hdr->__ifi_pad = 0;
297 hdr->ifi_type = dev->type;
298 hdr->ifi_index = dev->ifindex;
299 hdr->ifi_flags = dev_get_flags(dev);
300 hdr->ifi_change = 0;
301
302 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
303 nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
304 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
305 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
306 (dev->addr_len &&
307 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
308 (dev->ifindex != dev_get_iflink(dev) &&
309 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
310 goto nla_put_failure;
311
312 if (event == RTM_NEWLINK && port) {
313 struct nlattr *nest
314 = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
315
316 if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
317 goto nla_put_failure;
318 nla_nest_end(skb, nest);
319 }
320
321 /* Check if the VID information is requested */
322 if ((filter_mask & RTEXT_FILTER_BRVLAN) ||
323 (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) {
324 const struct net_port_vlans *pv;
325 struct nlattr *af;
326 int err;
327
328 if (port)
329 pv = nbp_get_vlan_info(port);
330 else
331 pv = br_get_vlan_info(br);
332
333 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
334 goto done;
335
336 af = nla_nest_start(skb, IFLA_AF_SPEC);
337 if (!af)
338 goto nla_put_failure;
339
340 if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
341 err = br_fill_ifvlaninfo_compressed(skb, pv);
342 else
343 err = br_fill_ifvlaninfo(skb, pv);
344 if (err)
345 goto nla_put_failure;
346 nla_nest_end(skb, af);
347 }
348
349 done:
350 nlmsg_end(skb, nlh);
351 return 0;
352
353 nla_put_failure:
354 nlmsg_cancel(skb, nlh);
355 return -EMSGSIZE;
356 }
357
358 /*
359 * Notify listeners of a change in port information
360 */
361 void br_ifinfo_notify(int event, struct net_bridge_port *port)
362 {
363 struct net *net;
364 struct sk_buff *skb;
365 int err = -ENOBUFS;
366 u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED;
367
368 if (!port)
369 return;
370
371 net = dev_net(port->dev);
372 br_debug(port->br, "port %u(%s) event %d\n",
373 (unsigned int)port->port_no, port->dev->name, event);
374
375 skb = nlmsg_new(br_nlmsg_size(port->dev, filter), GFP_ATOMIC);
376 if (skb == NULL)
377 goto errout;
378
379 err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, port->dev);
380 if (err < 0) {
381 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
382 WARN_ON(err == -EMSGSIZE);
383 kfree_skb(skb);
384 goto errout;
385 }
386 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
387 return;
388 errout:
389 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
390 }
391
392
393 /*
394 * Dump information about all ports, in response to GETLINK
395 */
396 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
397 struct net_device *dev, u32 filter_mask, int nlflags)
398 {
399 struct net_bridge_port *port = br_port_get_rtnl(dev);
400
401 if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) &&
402 !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
403 return 0;
404
405 return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags,
406 filter_mask, dev);
407 }
408
409 static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p,
410 int cmd, struct bridge_vlan_info *vinfo)
411 {
412 int err = 0;
413
414 switch (cmd) {
415 case RTM_SETLINK:
416 if (p) {
417 err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
418 if (err)
419 break;
420
421 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
422 err = br_vlan_add(p->br, vinfo->vid,
423 vinfo->flags);
424 } else {
425 err = br_vlan_add(br, vinfo->vid, vinfo->flags);
426 }
427 break;
428
429 case RTM_DELLINK:
430 if (p) {
431 nbp_vlan_delete(p, vinfo->vid);
432 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
433 br_vlan_delete(p->br, vinfo->vid);
434 } else {
435 br_vlan_delete(br, vinfo->vid);
436 }
437 break;
438 }
439
440 return err;
441 }
442
443 static int br_afspec(struct net_bridge *br,
444 struct net_bridge_port *p,
445 struct nlattr *af_spec,
446 int cmd)
447 {
448 struct bridge_vlan_info *vinfo_start = NULL;
449 struct bridge_vlan_info *vinfo = NULL;
450 struct nlattr *attr;
451 int err = 0;
452 int rem;
453
454 nla_for_each_nested(attr, af_spec, rem) {
455 if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
456 continue;
457 if (nla_len(attr) != sizeof(struct bridge_vlan_info))
458 return -EINVAL;
459 vinfo = nla_data(attr);
460 if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
461 if (vinfo_start)
462 return -EINVAL;
463 vinfo_start = vinfo;
464 continue;
465 }
466
467 if (vinfo_start) {
468 struct bridge_vlan_info tmp_vinfo;
469 int v;
470
471 if (!(vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END))
472 return -EINVAL;
473
474 if (vinfo->vid <= vinfo_start->vid)
475 return -EINVAL;
476
477 memcpy(&tmp_vinfo, vinfo_start,
478 sizeof(struct bridge_vlan_info));
479
480 for (v = vinfo_start->vid; v <= vinfo->vid; v++) {
481 tmp_vinfo.vid = v;
482 err = br_vlan_info(br, p, cmd, &tmp_vinfo);
483 if (err)
484 break;
485 }
486 vinfo_start = NULL;
487 } else {
488 err = br_vlan_info(br, p, cmd, vinfo);
489 }
490 if (err)
491 break;
492 }
493
494 return err;
495 }
496
497 static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
498 [IFLA_BRPORT_STATE] = { .type = NLA_U8 },
499 [IFLA_BRPORT_COST] = { .type = NLA_U32 },
500 [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
501 [IFLA_BRPORT_MODE] = { .type = NLA_U8 },
502 [IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
503 [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
504 [IFLA_BRPORT_FAST_LEAVE]= { .type = NLA_U8 },
505 [IFLA_BRPORT_LEARNING] = { .type = NLA_U8 },
506 [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
507 };
508
509 /* Change the state of the port and notify spanning tree */
510 static int br_set_port_state(struct net_bridge_port *p, u8 state)
511 {
512 if (state > BR_STATE_BLOCKING)
513 return -EINVAL;
514
515 /* if kernel STP is running, don't allow changes */
516 if (p->br->stp_enabled == BR_KERNEL_STP)
517 return -EBUSY;
518
519 /* if device is not up, change is not allowed
520 * if link is not present, only allowable state is disabled
521 */
522 if (!netif_running(p->dev) ||
523 (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
524 return -ENETDOWN;
525
526 br_set_state(p, state);
527 br_log_state(p);
528 br_port_state_selection(p->br);
529 return 0;
530 }
531
532 /* Set/clear or port flags based on attribute */
533 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
534 int attrtype, unsigned long mask)
535 {
536 if (tb[attrtype]) {
537 u8 flag = nla_get_u8(tb[attrtype]);
538 if (flag)
539 p->flags |= mask;
540 else
541 p->flags &= ~mask;
542 }
543 }
544
545 /* Process bridge protocol info on port */
546 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
547 {
548 int err;
549 unsigned long old_flags = p->flags;
550
551 br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
552 br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
553 br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
554 br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
555 br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
556 br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
557 br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
558 br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI);
559
560 if (tb[IFLA_BRPORT_COST]) {
561 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
562 if (err)
563 return err;
564 }
565
566 if (tb[IFLA_BRPORT_PRIORITY]) {
567 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
568 if (err)
569 return err;
570 }
571
572 if (tb[IFLA_BRPORT_STATE]) {
573 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
574 if (err)
575 return err;
576 }
577
578 br_port_flags_change(p, old_flags ^ p->flags);
579 return 0;
580 }
581
582 /* Change state and parameters on port. */
583 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
584 {
585 struct nlattr *protinfo;
586 struct nlattr *afspec;
587 struct net_bridge_port *p;
588 struct nlattr *tb[IFLA_BRPORT_MAX + 1];
589 int err = 0;
590
591 protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
592 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
593 if (!protinfo && !afspec)
594 return 0;
595
596 p = br_port_get_rtnl(dev);
597 /* We want to accept dev as bridge itself if the AF_SPEC
598 * is set to see if someone is setting vlan info on the bridge
599 */
600 if (!p && !afspec)
601 return -EINVAL;
602
603 if (p && protinfo) {
604 if (protinfo->nla_type & NLA_F_NESTED) {
605 err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
606 protinfo, br_port_policy);
607 if (err)
608 return err;
609
610 spin_lock_bh(&p->br->lock);
611 err = br_setport(p, tb);
612 spin_unlock_bh(&p->br->lock);
613 } else {
614 /* Binary compatibility with old RSTP */
615 if (nla_len(protinfo) < sizeof(u8))
616 return -EINVAL;
617
618 spin_lock_bh(&p->br->lock);
619 err = br_set_port_state(p, nla_get_u8(protinfo));
620 spin_unlock_bh(&p->br->lock);
621 }
622 if (err)
623 goto out;
624 }
625
626 if (afspec) {
627 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
628 afspec, RTM_SETLINK);
629 }
630
631 if (err == 0)
632 br_ifinfo_notify(RTM_NEWLINK, p);
633 out:
634 return err;
635 }
636
637 /* Delete port information */
638 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
639 {
640 struct nlattr *afspec;
641 struct net_bridge_port *p;
642 int err = 0;
643
644 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
645 if (!afspec)
646 return 0;
647
648 p = br_port_get_rtnl(dev);
649 /* We want to accept dev as bridge itself as well */
650 if (!p && !(dev->priv_flags & IFF_EBRIDGE))
651 return -EINVAL;
652
653 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
654 afspec, RTM_DELLINK);
655 if (err == 0)
656 /* Send RTM_NEWLINK because userspace
657 * expects RTM_NEWLINK for vlan dels
658 */
659 br_ifinfo_notify(RTM_NEWLINK, p);
660
661 return err;
662 }
663 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
664 {
665 if (tb[IFLA_ADDRESS]) {
666 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
667 return -EINVAL;
668 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
669 return -EADDRNOTAVAIL;
670 }
671
672 return 0;
673 }
674
675 static int br_dev_newlink(struct net *src_net, struct net_device *dev,
676 struct nlattr *tb[], struct nlattr *data[])
677 {
678 struct net_bridge *br = netdev_priv(dev);
679
680 if (tb[IFLA_ADDRESS]) {
681 spin_lock_bh(&br->lock);
682 br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
683 spin_unlock_bh(&br->lock);
684 }
685
686 return register_netdevice(dev);
687 }
688
689 static int br_port_slave_changelink(struct net_device *brdev,
690 struct net_device *dev,
691 struct nlattr *tb[],
692 struct nlattr *data[])
693 {
694 if (!data)
695 return 0;
696 return br_setport(br_port_get_rtnl(dev), data);
697 }
698
699 static int br_port_fill_slave_info(struct sk_buff *skb,
700 const struct net_device *brdev,
701 const struct net_device *dev)
702 {
703 return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
704 }
705
706 static size_t br_port_get_slave_size(const struct net_device *brdev,
707 const struct net_device *dev)
708 {
709 return br_port_info_size();
710 }
711
712 static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
713 [IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 },
714 [IFLA_BR_HELLO_TIME] = { .type = NLA_U32 },
715 [IFLA_BR_MAX_AGE] = { .type = NLA_U32 },
716 [IFLA_BR_AGEING_TIME] = { .type = NLA_U32 },
717 [IFLA_BR_STP_STATE] = { .type = NLA_U32 },
718 [IFLA_BR_PRIORITY] = { .type = NLA_U16 },
719 };
720
721 static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
722 struct nlattr *data[])
723 {
724 struct net_bridge *br = netdev_priv(brdev);
725 int err;
726
727 if (!data)
728 return 0;
729
730 if (data[IFLA_BR_FORWARD_DELAY]) {
731 err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
732 if (err)
733 return err;
734 }
735
736 if (data[IFLA_BR_HELLO_TIME]) {
737 err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
738 if (err)
739 return err;
740 }
741
742 if (data[IFLA_BR_MAX_AGE]) {
743 err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
744 if (err)
745 return err;
746 }
747
748 if (data[IFLA_BR_AGEING_TIME]) {
749 u32 ageing_time = nla_get_u32(data[IFLA_BR_AGEING_TIME]);
750
751 br->ageing_time = clock_t_to_jiffies(ageing_time);
752 }
753
754 if (data[IFLA_BR_STP_STATE]) {
755 u32 stp_enabled = nla_get_u32(data[IFLA_BR_STP_STATE]);
756
757 br_stp_set_enabled(br, stp_enabled);
758 }
759
760 if (data[IFLA_BR_PRIORITY]) {
761 u32 priority = nla_get_u16(data[IFLA_BR_PRIORITY]);
762
763 br_stp_set_bridge_priority(br, priority);
764 }
765
766 return 0;
767 }
768
769 static size_t br_get_size(const struct net_device *brdev)
770 {
771 return nla_total_size(sizeof(u32)) + /* IFLA_BR_FORWARD_DELAY */
772 nla_total_size(sizeof(u32)) + /* IFLA_BR_HELLO_TIME */
773 nla_total_size(sizeof(u32)) + /* IFLA_BR_MAX_AGE */
774 nla_total_size(sizeof(u32)) + /* IFLA_BR_AGEING_TIME */
775 nla_total_size(sizeof(u32)) + /* IFLA_BR_STP_STATE */
776 nla_total_size(sizeof(u16)) + /* IFLA_BR_PRIORITY */
777 0;
778 }
779
780 static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
781 {
782 struct net_bridge *br = netdev_priv(brdev);
783 u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
784 u32 hello_time = jiffies_to_clock_t(br->hello_time);
785 u32 age_time = jiffies_to_clock_t(br->max_age);
786 u32 ageing_time = jiffies_to_clock_t(br->ageing_time);
787 u32 stp_enabled = br->stp_enabled;
788 u16 priority = (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1];
789
790 if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) ||
791 nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) ||
792 nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time) ||
793 nla_put_u32(skb, IFLA_BR_AGEING_TIME, ageing_time) ||
794 nla_put_u32(skb, IFLA_BR_STP_STATE, stp_enabled) ||
795 nla_put_u16(skb, IFLA_BR_PRIORITY, priority))
796 return -EMSGSIZE;
797
798 return 0;
799 }
800
801 static size_t br_get_link_af_size(const struct net_device *dev)
802 {
803 struct net_port_vlans *pv;
804
805 if (br_port_exists(dev))
806 pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
807 else if (dev->priv_flags & IFF_EBRIDGE)
808 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
809 else
810 return 0;
811
812 if (!pv)
813 return 0;
814
815 /* Each VLAN is returned in bridge_vlan_info along with flags */
816 return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
817 }
818
819 static struct rtnl_af_ops br_af_ops __read_mostly = {
820 .family = AF_BRIDGE,
821 .get_link_af_size = br_get_link_af_size,
822 };
823
824 struct rtnl_link_ops br_link_ops __read_mostly = {
825 .kind = "bridge",
826 .priv_size = sizeof(struct net_bridge),
827 .setup = br_dev_setup,
828 .maxtype = IFLA_BRPORT_MAX,
829 .policy = br_policy,
830 .validate = br_validate,
831 .newlink = br_dev_newlink,
832 .changelink = br_changelink,
833 .dellink = br_dev_delete,
834 .get_size = br_get_size,
835 .fill_info = br_fill_info,
836
837 .slave_maxtype = IFLA_BRPORT_MAX,
838 .slave_policy = br_port_policy,
839 .slave_changelink = br_port_slave_changelink,
840 .get_slave_size = br_port_get_slave_size,
841 .fill_slave_info = br_port_fill_slave_info,
842 };
843
844 int __init br_netlink_init(void)
845 {
846 int err;
847
848 br_mdb_init();
849 rtnl_af_register(&br_af_ops);
850
851 err = rtnl_link_register(&br_link_ops);
852 if (err)
853 goto out_af;
854
855 return 0;
856
857 out_af:
858 rtnl_af_unregister(&br_af_ops);
859 br_mdb_uninit();
860 return err;
861 }
862
863 void br_netlink_fini(void)
864 {
865 br_mdb_uninit();
866 rtnl_af_unregister(&br_af_ops);
867 rtnl_link_unregister(&br_link_ops);
868 }
Linux kernel - Deliverables
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