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[mirror_ubuntu-zesty-kernel.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->vid || vinfo->vid >= VLAN_VID_MASK)
461 return -EINVAL;
462 if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
463 if (vinfo_start)
464 return -EINVAL;
465 vinfo_start = vinfo;
466 continue;
467 }
468
469 if (vinfo_start) {
470 struct bridge_vlan_info tmp_vinfo;
471 int v;
472
473 if (!(vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END))
474 return -EINVAL;
475
476 if (vinfo->vid <= vinfo_start->vid)
477 return -EINVAL;
478
479 memcpy(&tmp_vinfo, vinfo_start,
480 sizeof(struct bridge_vlan_info));
481
482 for (v = vinfo_start->vid; v <= vinfo->vid; v++) {
483 tmp_vinfo.vid = v;
484 err = br_vlan_info(br, p, cmd, &tmp_vinfo);
485 if (err)
486 break;
487 }
488 vinfo_start = NULL;
489 } else {
490 err = br_vlan_info(br, p, cmd, vinfo);
491 }
492 if (err)
493 break;
494 }
495
496 return err;
497 }
498
499 static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
500 [IFLA_BRPORT_STATE] = { .type = NLA_U8 },
501 [IFLA_BRPORT_COST] = { .type = NLA_U32 },
502 [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
503 [IFLA_BRPORT_MODE] = { .type = NLA_U8 },
504 [IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
505 [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
506 [IFLA_BRPORT_FAST_LEAVE]= { .type = NLA_U8 },
507 [IFLA_BRPORT_LEARNING] = { .type = NLA_U8 },
508 [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
509 };
510
511 /* Change the state of the port and notify spanning tree */
512 static int br_set_port_state(struct net_bridge_port *p, u8 state)
513 {
514 if (state > BR_STATE_BLOCKING)
515 return -EINVAL;
516
517 /* if kernel STP is running, don't allow changes */
518 if (p->br->stp_enabled == BR_KERNEL_STP)
519 return -EBUSY;
520
521 /* if device is not up, change is not allowed
522 * if link is not present, only allowable state is disabled
523 */
524 if (!netif_running(p->dev) ||
525 (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
526 return -ENETDOWN;
527
528 br_set_state(p, state);
529 br_log_state(p);
530 br_port_state_selection(p->br);
531 return 0;
532 }
533
534 /* Set/clear or port flags based on attribute */
535 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
536 int attrtype, unsigned long mask)
537 {
538 if (tb[attrtype]) {
539 u8 flag = nla_get_u8(tb[attrtype]);
540 if (flag)
541 p->flags |= mask;
542 else
543 p->flags &= ~mask;
544 }
545 }
546
547 /* Process bridge protocol info on port */
548 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
549 {
550 int err;
551 unsigned long old_flags = p->flags;
552
553 br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
554 br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
555 br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
556 br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
557 br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
558 br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
559 br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
560 br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI);
561
562 if (tb[IFLA_BRPORT_COST]) {
563 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
564 if (err)
565 return err;
566 }
567
568 if (tb[IFLA_BRPORT_PRIORITY]) {
569 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
570 if (err)
571 return err;
572 }
573
574 if (tb[IFLA_BRPORT_STATE]) {
575 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
576 if (err)
577 return err;
578 }
579
580 br_port_flags_change(p, old_flags ^ p->flags);
581 return 0;
582 }
583
584 /* Change state and parameters on port. */
585 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
586 {
587 struct nlattr *protinfo;
588 struct nlattr *afspec;
589 struct net_bridge_port *p;
590 struct nlattr *tb[IFLA_BRPORT_MAX + 1];
591 int err = 0;
592
593 protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
594 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
595 if (!protinfo && !afspec)
596 return 0;
597
598 p = br_port_get_rtnl(dev);
599 /* We want to accept dev as bridge itself if the AF_SPEC
600 * is set to see if someone is setting vlan info on the bridge
601 */
602 if (!p && !afspec)
603 return -EINVAL;
604
605 if (p && protinfo) {
606 if (protinfo->nla_type & NLA_F_NESTED) {
607 err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
608 protinfo, br_port_policy);
609 if (err)
610 return err;
611
612 spin_lock_bh(&p->br->lock);
613 err = br_setport(p, tb);
614 spin_unlock_bh(&p->br->lock);
615 } else {
616 /* Binary compatibility with old RSTP */
617 if (nla_len(protinfo) < sizeof(u8))
618 return -EINVAL;
619
620 spin_lock_bh(&p->br->lock);
621 err = br_set_port_state(p, nla_get_u8(protinfo));
622 spin_unlock_bh(&p->br->lock);
623 }
624 if (err)
625 goto out;
626 }
627
628 if (afspec) {
629 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
630 afspec, RTM_SETLINK);
631 }
632
633 if (err == 0)
634 br_ifinfo_notify(RTM_NEWLINK, p);
635 out:
636 return err;
637 }
638
639 /* Delete port information */
640 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
641 {
642 struct nlattr *afspec;
643 struct net_bridge_port *p;
644 int err = 0;
645
646 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
647 if (!afspec)
648 return 0;
649
650 p = br_port_get_rtnl(dev);
651 /* We want to accept dev as bridge itself as well */
652 if (!p && !(dev->priv_flags & IFF_EBRIDGE))
653 return -EINVAL;
654
655 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
656 afspec, RTM_DELLINK);
657 if (err == 0)
658 /* Send RTM_NEWLINK because userspace
659 * expects RTM_NEWLINK for vlan dels
660 */
661 br_ifinfo_notify(RTM_NEWLINK, p);
662
663 return err;
664 }
665 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
666 {
667 if (tb[IFLA_ADDRESS]) {
668 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
669 return -EINVAL;
670 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
671 return -EADDRNOTAVAIL;
672 }
673
674 return 0;
675 }
676
677 static int br_dev_newlink(struct net *src_net, struct net_device *dev,
678 struct nlattr *tb[], struct nlattr *data[])
679 {
680 struct net_bridge *br = netdev_priv(dev);
681
682 if (tb[IFLA_ADDRESS]) {
683 spin_lock_bh(&br->lock);
684 br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
685 spin_unlock_bh(&br->lock);
686 }
687
688 return register_netdevice(dev);
689 }
690
691 static int br_port_slave_changelink(struct net_device *brdev,
692 struct net_device *dev,
693 struct nlattr *tb[],
694 struct nlattr *data[])
695 {
696 if (!data)
697 return 0;
698 return br_setport(br_port_get_rtnl(dev), data);
699 }
700
701 static int br_port_fill_slave_info(struct sk_buff *skb,
702 const struct net_device *brdev,
703 const struct net_device *dev)
704 {
705 return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
706 }
707
708 static size_t br_port_get_slave_size(const struct net_device *brdev,
709 const struct net_device *dev)
710 {
711 return br_port_info_size();
712 }
713
714 static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
715 [IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 },
716 [IFLA_BR_HELLO_TIME] = { .type = NLA_U32 },
717 [IFLA_BR_MAX_AGE] = { .type = NLA_U32 },
718 [IFLA_BR_AGEING_TIME] = { .type = NLA_U32 },
719 [IFLA_BR_STP_STATE] = { .type = NLA_U32 },
720 [IFLA_BR_PRIORITY] = { .type = NLA_U16 },
721 };
722
723 static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
724 struct nlattr *data[])
725 {
726 struct net_bridge *br = netdev_priv(brdev);
727 int err;
728
729 if (!data)
730 return 0;
731
732 if (data[IFLA_BR_FORWARD_DELAY]) {
733 err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
734 if (err)
735 return err;
736 }
737
738 if (data[IFLA_BR_HELLO_TIME]) {
739 err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
740 if (err)
741 return err;
742 }
743
744 if (data[IFLA_BR_MAX_AGE]) {
745 err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
746 if (err)
747 return err;
748 }
749
750 if (data[IFLA_BR_AGEING_TIME]) {
751 u32 ageing_time = nla_get_u32(data[IFLA_BR_AGEING_TIME]);
752
753 br->ageing_time = clock_t_to_jiffies(ageing_time);
754 }
755
756 if (data[IFLA_BR_STP_STATE]) {
757 u32 stp_enabled = nla_get_u32(data[IFLA_BR_STP_STATE]);
758
759 br_stp_set_enabled(br, stp_enabled);
760 }
761
762 if (data[IFLA_BR_PRIORITY]) {
763 u32 priority = nla_get_u16(data[IFLA_BR_PRIORITY]);
764
765 br_stp_set_bridge_priority(br, priority);
766 }
767
768 return 0;
769 }
770
771 static size_t br_get_size(const struct net_device *brdev)
772 {
773 return nla_total_size(sizeof(u32)) + /* IFLA_BR_FORWARD_DELAY */
774 nla_total_size(sizeof(u32)) + /* IFLA_BR_HELLO_TIME */
775 nla_total_size(sizeof(u32)) + /* IFLA_BR_MAX_AGE */
776 nla_total_size(sizeof(u32)) + /* IFLA_BR_AGEING_TIME */
777 nla_total_size(sizeof(u32)) + /* IFLA_BR_STP_STATE */
778 nla_total_size(sizeof(u16)) + /* IFLA_BR_PRIORITY */
779 0;
780 }
781
782 static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
783 {
784 struct net_bridge *br = netdev_priv(brdev);
785 u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
786 u32 hello_time = jiffies_to_clock_t(br->hello_time);
787 u32 age_time = jiffies_to_clock_t(br->max_age);
788 u32 ageing_time = jiffies_to_clock_t(br->ageing_time);
789 u32 stp_enabled = br->stp_enabled;
790 u16 priority = (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1];
791
792 if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) ||
793 nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) ||
794 nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time) ||
795 nla_put_u32(skb, IFLA_BR_AGEING_TIME, ageing_time) ||
796 nla_put_u32(skb, IFLA_BR_STP_STATE, stp_enabled) ||
797 nla_put_u16(skb, IFLA_BR_PRIORITY, priority))
798 return -EMSGSIZE;
799
800 return 0;
801 }
802
803 static size_t br_get_link_af_size(const struct net_device *dev)
804 {
805 struct net_port_vlans *pv;
806
807 if (br_port_exists(dev))
808 pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
809 else if (dev->priv_flags & IFF_EBRIDGE)
810 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
811 else
812 return 0;
813
814 if (!pv)
815 return 0;
816
817 /* Each VLAN is returned in bridge_vlan_info along with flags */
818 return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
819 }
820
821 static struct rtnl_af_ops br_af_ops __read_mostly = {
822 .family = AF_BRIDGE,
823 .get_link_af_size = br_get_link_af_size,
824 };
825
826 struct rtnl_link_ops br_link_ops __read_mostly = {
827 .kind = "bridge",
828 .priv_size = sizeof(struct net_bridge),
829 .setup = br_dev_setup,
830 .maxtype = IFLA_BRPORT_MAX,
831 .policy = br_policy,
832 .validate = br_validate,
833 .newlink = br_dev_newlink,
834 .changelink = br_changelink,
835 .dellink = br_dev_delete,
836 .get_size = br_get_size,
837 .fill_info = br_fill_info,
838
839 .slave_maxtype = IFLA_BRPORT_MAX,
840 .slave_policy = br_port_policy,
841 .slave_changelink = br_port_slave_changelink,
842 .get_slave_size = br_port_get_slave_size,
843 .fill_slave_info = br_port_fill_slave_info,
844 };
845
846 int __init br_netlink_init(void)
847 {
848 int err;
849
850 br_mdb_init();
851 rtnl_af_register(&br_af_ops);
852
853 err = rtnl_link_register(&br_link_ops);
854 if (err)
855 goto out_af;
856
857 return 0;
858
859 out_af:
860 rtnl_af_unregister(&br_af_ops);
861 br_mdb_uninit();
862 return err;
863 }
864
865 void br_netlink_fini(void)
866 {
867 br_mdb_uninit();
868 rtnl_af_unregister(&br_af_ops);
869 rtnl_link_unregister(&br_link_ops);
870 }
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