]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/bridge/br_netlink.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:


5390536d500c6fee9970226bf2e584475f2daa5f
[mirror_ubuntu-bionic-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 + nla_total_size(1) /* IFLA_BRPORT_PROXYARP */
116 + 0;
117 }
118
119 static inline size_t br_nlmsg_size(struct net_device *dev, u32 filter_mask)
120 {
121 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
122 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
123 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
124 + nla_total_size(4) /* IFLA_MASTER */
125 + nla_total_size(4) /* IFLA_MTU */
126 + nla_total_size(4) /* IFLA_LINK */
127 + nla_total_size(1) /* IFLA_OPERSTATE */
128 + nla_total_size(br_port_info_size()) /* IFLA_PROTINFO */
129 + nla_total_size(br_get_link_af_size_filtered(dev,
130 filter_mask)); /* IFLA_AF_SPEC */
131 }
132
133 static int br_port_fill_attrs(struct sk_buff *skb,
134 const struct net_bridge_port *p)
135 {
136 u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
137
138 if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
139 nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
140 nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
141 nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
142 nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
143 nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
144 nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
145 nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
146 nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)) ||
147 nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)) ||
148 nla_put_u8(skb, IFLA_BRPORT_PROXYARP_WIFI,
149 !!(p->flags & BR_PROXYARP_WIFI)))
150 return -EMSGSIZE;
151
152 return 0;
153 }
154
155 static int br_fill_ifvlaninfo_range(struct sk_buff *skb, u16 vid_start,
156 u16 vid_end, u16 flags)
157 {
158 struct bridge_vlan_info vinfo;
159
160 if ((vid_end - vid_start) > 0) {
161 /* add range to skb */
162 vinfo.vid = vid_start;
163 vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_BEGIN;
164 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
165 sizeof(vinfo), &vinfo))
166 goto nla_put_failure;
167
168 vinfo.flags &= ~BRIDGE_VLAN_INFO_RANGE_BEGIN;
169
170 vinfo.vid = vid_end;
171 vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_END;
172 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
173 sizeof(vinfo), &vinfo))
174 goto nla_put_failure;
175 } else {
176 vinfo.vid = vid_start;
177 vinfo.flags = flags;
178 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
179 sizeof(vinfo), &vinfo))
180 goto nla_put_failure;
181 }
182
183 return 0;
184
185 nla_put_failure:
186 return -EMSGSIZE;
187 }
188
189 static int br_fill_ifvlaninfo_compressed(struct sk_buff *skb,
190 const struct net_port_vlans *pv)
191 {
192 u16 vid_range_start = 0, vid_range_end = 0;
193 u16 vid_range_flags = 0;
194 u16 pvid, vid, flags;
195 int err = 0;
196
197 /* Pack IFLA_BRIDGE_VLAN_INFO's for every vlan
198 * and mark vlan info with begin and end flags
199 * if vlaninfo represents a range
200 */
201 pvid = br_get_pvid(pv);
202 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
203 flags = 0;
204 if (vid == pvid)
205 flags |= BRIDGE_VLAN_INFO_PVID;
206
207 if (test_bit(vid, pv->untagged_bitmap))
208 flags |= BRIDGE_VLAN_INFO_UNTAGGED;
209
210 if (vid_range_start == 0) {
211 goto initvars;
212 } else if ((vid - vid_range_end) == 1 &&
213 flags == vid_range_flags) {
214 vid_range_end = vid;
215 continue;
216 } else {
217 err = br_fill_ifvlaninfo_range(skb, vid_range_start,
218 vid_range_end,
219 vid_range_flags);
220 if (err)
221 return err;
222 }
223
224 initvars:
225 vid_range_start = vid;
226 vid_range_end = vid;
227 vid_range_flags = flags;
228 }
229
230 if (vid_range_start != 0) {
231 /* Call it once more to send any left over vlans */
232 err = br_fill_ifvlaninfo_range(skb, vid_range_start,
233 vid_range_end,
234 vid_range_flags);
235 if (err)
236 return err;
237 }
238
239 return 0;
240 }
241
242 static int br_fill_ifvlaninfo(struct sk_buff *skb,
243 const struct net_port_vlans *pv)
244 {
245 struct bridge_vlan_info vinfo;
246 u16 pvid, vid;
247
248 pvid = br_get_pvid(pv);
249 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
250 vinfo.vid = vid;
251 vinfo.flags = 0;
252 if (vid == pvid)
253 vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
254
255 if (test_bit(vid, pv->untagged_bitmap))
256 vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
257
258 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
259 sizeof(vinfo), &vinfo))
260 goto nla_put_failure;
261 }
262
263 return 0;
264
265 nla_put_failure:
266 return -EMSGSIZE;
267 }
268
269 /*
270 * Create one netlink message for one interface
271 * Contains port and master info as well as carrier and bridge state.
272 */
273 static int br_fill_ifinfo(struct sk_buff *skb,
274 const struct net_bridge_port *port,
275 u32 pid, u32 seq, int event, unsigned int flags,
276 u32 filter_mask, const struct net_device *dev)
277 {
278 const struct net_bridge *br;
279 struct ifinfomsg *hdr;
280 struct nlmsghdr *nlh;
281 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
282
283 if (port)
284 br = port->br;
285 else
286 br = netdev_priv(dev);
287
288 br_debug(br, "br_fill_info event %d port %s master %s\n",
289 event, dev->name, br->dev->name);
290
291 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
292 if (nlh == NULL)
293 return -EMSGSIZE;
294
295 hdr = nlmsg_data(nlh);
296 hdr->ifi_family = AF_BRIDGE;
297 hdr->__ifi_pad = 0;
298 hdr->ifi_type = dev->type;
299 hdr->ifi_index = dev->ifindex;
300 hdr->ifi_flags = dev_get_flags(dev);
301 hdr->ifi_change = 0;
302
303 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
304 nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
305 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
306 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
307 (dev->addr_len &&
308 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
309 (dev->ifindex != dev_get_iflink(dev) &&
310 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
311 goto nla_put_failure;
312
313 if (event == RTM_NEWLINK && port) {
314 struct nlattr *nest
315 = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
316
317 if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
318 goto nla_put_failure;
319 nla_nest_end(skb, nest);
320 }
321
322 /* Check if the VID information is requested */
323 if ((filter_mask & RTEXT_FILTER_BRVLAN) ||
324 (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) {
325 const struct net_port_vlans *pv;
326 struct nlattr *af;
327 int err;
328
329 if (port)
330 pv = nbp_get_vlan_info(port);
331 else
332 pv = br_get_vlan_info(br);
333
334 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
335 goto done;
336
337 af = nla_nest_start(skb, IFLA_AF_SPEC);
338 if (!af)
339 goto nla_put_failure;
340
341 if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
342 err = br_fill_ifvlaninfo_compressed(skb, pv);
343 else
344 err = br_fill_ifvlaninfo(skb, pv);
345 if (err)
346 goto nla_put_failure;
347 nla_nest_end(skb, af);
348 }
349
350 done:
351 nlmsg_end(skb, nlh);
352 return 0;
353
354 nla_put_failure:
355 nlmsg_cancel(skb, nlh);
356 return -EMSGSIZE;
357 }
358
359 /*
360 * Notify listeners of a change in port information
361 */
362 void br_ifinfo_notify(int event, struct net_bridge_port *port)
363 {
364 struct net *net;
365 struct sk_buff *skb;
366 int err = -ENOBUFS;
367 u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED;
368
369 if (!port)
370 return;
371
372 net = dev_net(port->dev);
373 br_debug(port->br, "port %u(%s) event %d\n",
374 (unsigned int)port->port_no, port->dev->name, event);
375
376 skb = nlmsg_new(br_nlmsg_size(port->dev, filter), GFP_ATOMIC);
377 if (skb == NULL)
378 goto errout;
379
380 err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, port->dev);
381 if (err < 0) {
382 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
383 WARN_ON(err == -EMSGSIZE);
384 kfree_skb(skb);
385 goto errout;
386 }
387 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
388 return;
389 errout:
390 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
391 }
392
393
394 /*
395 * Dump information about all ports, in response to GETLINK
396 */
397 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
398 struct net_device *dev, u32 filter_mask, int nlflags)
399 {
400 struct net_bridge_port *port = br_port_get_rtnl(dev);
401
402 if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) &&
403 !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
404 return 0;
405
406 return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags,
407 filter_mask, dev);
408 }
409
410 static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p,
411 int cmd, struct bridge_vlan_info *vinfo)
412 {
413 int err = 0;
414
415 switch (cmd) {
416 case RTM_SETLINK:
417 if (p) {
418 err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
419 if (err)
420 break;
421
422 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
423 err = br_vlan_add(p->br, vinfo->vid,
424 vinfo->flags);
425 } else {
426 err = br_vlan_add(br, vinfo->vid, vinfo->flags);
427 }
428 break;
429
430 case RTM_DELLINK:
431 if (p) {
432 nbp_vlan_delete(p, vinfo->vid);
433 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
434 br_vlan_delete(p->br, vinfo->vid);
435 } else {
436 br_vlan_delete(br, vinfo->vid);
437 }
438 break;
439 }
440
441 return err;
442 }
443
444 static int br_afspec(struct net_bridge *br,
445 struct net_bridge_port *p,
446 struct nlattr *af_spec,
447 int cmd)
448 {
449 struct bridge_vlan_info *vinfo_start = NULL;
450 struct bridge_vlan_info *vinfo = NULL;
451 struct nlattr *attr;
452 int err = 0;
453 int rem;
454
455 nla_for_each_nested(attr, af_spec, rem) {
456 if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
457 continue;
458 if (nla_len(attr) != sizeof(struct bridge_vlan_info))
459 return -EINVAL;
460 vinfo = nla_data(attr);
461 if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
462 return -EINVAL;
463 if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
464 if (vinfo_start)
465 return -EINVAL;
466 vinfo_start = vinfo;
467 continue;
468 }
469
470 if (vinfo_start) {
471 struct bridge_vlan_info tmp_vinfo;
472 int v;
473
474 if (!(vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END))
475 return -EINVAL;
476
477 if (vinfo->vid <= vinfo_start->vid)
478 return -EINVAL;
479
480 memcpy(&tmp_vinfo, vinfo_start,
481 sizeof(struct bridge_vlan_info));
482
483 for (v = vinfo_start->vid; v <= vinfo->vid; v++) {
484 tmp_vinfo.vid = v;
485 err = br_vlan_info(br, p, cmd, &tmp_vinfo);
486 if (err)
487 break;
488 }
489 vinfo_start = NULL;
490 } else {
491 err = br_vlan_info(br, p, cmd, vinfo);
492 }
493 if (err)
494 break;
495 }
496
497 return err;
498 }
499
500 static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
501 [IFLA_BRPORT_STATE] = { .type = NLA_U8 },
502 [IFLA_BRPORT_COST] = { .type = NLA_U32 },
503 [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
504 [IFLA_BRPORT_MODE] = { .type = NLA_U8 },
505 [IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
506 [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
507 [IFLA_BRPORT_FAST_LEAVE]= { .type = NLA_U8 },
508 [IFLA_BRPORT_LEARNING] = { .type = NLA_U8 },
509 [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
510 [IFLA_BRPORT_PROXYARP] = { .type = NLA_U8 },
511 };
512
513 /* Change the state of the port and notify spanning tree */
514 static int br_set_port_state(struct net_bridge_port *p, u8 state)
515 {
516 if (state > BR_STATE_BLOCKING)
517 return -EINVAL;
518
519 /* if kernel STP is running, don't allow changes */
520 if (p->br->stp_enabled == BR_KERNEL_STP)
521 return -EBUSY;
522
523 /* if device is not up, change is not allowed
524 * if link is not present, only allowable state is disabled
525 */
526 if (!netif_running(p->dev) ||
527 (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
528 return -ENETDOWN;
529
530 br_set_state(p, state);
531 br_log_state(p);
532 br_port_state_selection(p->br);
533 return 0;
534 }
535
536 /* Set/clear or port flags based on attribute */
537 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
538 int attrtype, unsigned long mask)
539 {
540 if (tb[attrtype]) {
541 u8 flag = nla_get_u8(tb[attrtype]);
542 if (flag)
543 p->flags |= mask;
544 else
545 p->flags &= ~mask;
546 }
547 }
548
549 /* Process bridge protocol info on port */
550 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
551 {
552 int err;
553 unsigned long old_flags = p->flags;
554
555 br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
556 br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
557 br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
558 br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
559 br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
560 br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
561 br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
562 br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI);
563
564 if (tb[IFLA_BRPORT_COST]) {
565 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
566 if (err)
567 return err;
568 }
569
570 if (tb[IFLA_BRPORT_PRIORITY]) {
571 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
572 if (err)
573 return err;
574 }
575
576 if (tb[IFLA_BRPORT_STATE]) {
577 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
578 if (err)
579 return err;
580 }
581
582 br_port_flags_change(p, old_flags ^ p->flags);
583 return 0;
584 }
585
586 /* Change state and parameters on port. */
587 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
588 {
589 struct nlattr *protinfo;
590 struct nlattr *afspec;
591 struct net_bridge_port *p;
592 struct nlattr *tb[IFLA_BRPORT_MAX + 1];
593 int err = 0;
594
595 protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
596 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
597 if (!protinfo && !afspec)
598 return 0;
599
600 p = br_port_get_rtnl(dev);
601 /* We want to accept dev as bridge itself if the AF_SPEC
602 * is set to see if someone is setting vlan info on the bridge
603 */
604 if (!p && !afspec)
605 return -EINVAL;
606
607 if (p && protinfo) {
608 if (protinfo->nla_type & NLA_F_NESTED) {
609 err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
610 protinfo, br_port_policy);
611 if (err)
612 return err;
613
614 spin_lock_bh(&p->br->lock);
615 err = br_setport(p, tb);
616 spin_unlock_bh(&p->br->lock);
617 } else {
618 /* Binary compatibility with old RSTP */
619 if (nla_len(protinfo) < sizeof(u8))
620 return -EINVAL;
621
622 spin_lock_bh(&p->br->lock);
623 err = br_set_port_state(p, nla_get_u8(protinfo));
624 spin_unlock_bh(&p->br->lock);
625 }
626 if (err)
627 goto out;
628 }
629
630 if (afspec) {
631 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
632 afspec, RTM_SETLINK);
633 }
634
635 if (err == 0)
636 br_ifinfo_notify(RTM_NEWLINK, p);
637 out:
638 return err;
639 }
640
641 /* Delete port information */
642 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
643 {
644 struct nlattr *afspec;
645 struct net_bridge_port *p;
646 int err = 0;
647
648 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
649 if (!afspec)
650 return 0;
651
652 p = br_port_get_rtnl(dev);
653 /* We want to accept dev as bridge itself as well */
654 if (!p && !(dev->priv_flags & IFF_EBRIDGE))
655 return -EINVAL;
656
657 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
658 afspec, RTM_DELLINK);
659 if (err == 0)
660 /* Send RTM_NEWLINK because userspace
661 * expects RTM_NEWLINK for vlan dels
662 */
663 br_ifinfo_notify(RTM_NEWLINK, p);
664
665 return err;
666 }
667 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
668 {
669 if (tb[IFLA_ADDRESS]) {
670 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
671 return -EINVAL;
672 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
673 return -EADDRNOTAVAIL;
674 }
675
676 return 0;
677 }
678
679 static int br_dev_newlink(struct net *src_net, struct net_device *dev,
680 struct nlattr *tb[], struct nlattr *data[])
681 {
682 struct net_bridge *br = netdev_priv(dev);
683
684 if (tb[IFLA_ADDRESS]) {
685 spin_lock_bh(&br->lock);
686 br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
687 spin_unlock_bh(&br->lock);
688 }
689
690 return register_netdevice(dev);
691 }
692
693 static int br_port_slave_changelink(struct net_device *brdev,
694 struct net_device *dev,
695 struct nlattr *tb[],
696 struct nlattr *data[])
697 {
698 struct net_bridge *br = netdev_priv(brdev);
699 int ret;
700
701 if (!data)
702 return 0;
703
704 spin_lock_bh(&br->lock);
705 ret = br_setport(br_port_get_rtnl(dev), data);
706 spin_unlock_bh(&br->lock);
707
708 return ret;
709 }
710
711 static int br_port_fill_slave_info(struct sk_buff *skb,
712 const struct net_device *brdev,
713 const struct net_device *dev)
714 {
715 return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
716 }
717
718 static size_t br_port_get_slave_size(const struct net_device *brdev,
719 const struct net_device *dev)
720 {
721 return br_port_info_size();
722 }
723
724 static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
725 [IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 },
726 [IFLA_BR_HELLO_TIME] = { .type = NLA_U32 },
727 [IFLA_BR_MAX_AGE] = { .type = NLA_U32 },
728 [IFLA_BR_AGEING_TIME] = { .type = NLA_U32 },
729 [IFLA_BR_STP_STATE] = { .type = NLA_U32 },
730 [IFLA_BR_PRIORITY] = { .type = NLA_U16 },
731 };
732
733 static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
734 struct nlattr *data[])
735 {
736 struct net_bridge *br = netdev_priv(brdev);
737 int err;
738
739 if (!data)
740 return 0;
741
742 if (data[IFLA_BR_FORWARD_DELAY]) {
743 err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
744 if (err)
745 return err;
746 }
747
748 if (data[IFLA_BR_HELLO_TIME]) {
749 err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
750 if (err)
751 return err;
752 }
753
754 if (data[IFLA_BR_MAX_AGE]) {
755 err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
756 if (err)
757 return err;
758 }
759
760 if (data[IFLA_BR_AGEING_TIME]) {
761 u32 ageing_time = nla_get_u32(data[IFLA_BR_AGEING_TIME]);
762
763 br->ageing_time = clock_t_to_jiffies(ageing_time);
764 }
765
766 if (data[IFLA_BR_STP_STATE]) {
767 u32 stp_enabled = nla_get_u32(data[IFLA_BR_STP_STATE]);
768
769 br_stp_set_enabled(br, stp_enabled);
770 }
771
772 if (data[IFLA_BR_PRIORITY]) {
773 u32 priority = nla_get_u16(data[IFLA_BR_PRIORITY]);
774
775 br_stp_set_bridge_priority(br, priority);
776 }
777
778 return 0;
779 }
780
781 static size_t br_get_size(const struct net_device *brdev)
782 {
783 return nla_total_size(sizeof(u32)) + /* IFLA_BR_FORWARD_DELAY */
784 nla_total_size(sizeof(u32)) + /* IFLA_BR_HELLO_TIME */
785 nla_total_size(sizeof(u32)) + /* IFLA_BR_MAX_AGE */
786 nla_total_size(sizeof(u32)) + /* IFLA_BR_AGEING_TIME */
787 nla_total_size(sizeof(u32)) + /* IFLA_BR_STP_STATE */
788 nla_total_size(sizeof(u16)) + /* IFLA_BR_PRIORITY */
789 0;
790 }
791
792 static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
793 {
794 struct net_bridge *br = netdev_priv(brdev);
795 u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
796 u32 hello_time = jiffies_to_clock_t(br->hello_time);
797 u32 age_time = jiffies_to_clock_t(br->max_age);
798 u32 ageing_time = jiffies_to_clock_t(br->ageing_time);
799 u32 stp_enabled = br->stp_enabled;
800 u16 priority = (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1];
801
802 if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) ||
803 nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) ||
804 nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time) ||
805 nla_put_u32(skb, IFLA_BR_AGEING_TIME, ageing_time) ||
806 nla_put_u32(skb, IFLA_BR_STP_STATE, stp_enabled) ||
807 nla_put_u16(skb, IFLA_BR_PRIORITY, priority))
808 return -EMSGSIZE;
809
810 return 0;
811 }
812
813 static size_t br_get_link_af_size(const struct net_device *dev)
814 {
815 struct net_port_vlans *pv;
816
817 if (br_port_exists(dev))
818 pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
819 else if (dev->priv_flags & IFF_EBRIDGE)
820 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
821 else
822 return 0;
823
824 if (!pv)
825 return 0;
826
827 /* Each VLAN is returned in bridge_vlan_info along with flags */
828 return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
829 }
830
831 static struct rtnl_af_ops br_af_ops __read_mostly = {
832 .family = AF_BRIDGE,
833 .get_link_af_size = br_get_link_af_size,
834 };
835
836 struct rtnl_link_ops br_link_ops __read_mostly = {
837 .kind = "bridge",
838 .priv_size = sizeof(struct net_bridge),
839 .setup = br_dev_setup,
840 .maxtype = IFLA_BRPORT_MAX,
841 .policy = br_policy,
842 .validate = br_validate,
843 .newlink = br_dev_newlink,
844 .changelink = br_changelink,
845 .dellink = br_dev_delete,
846 .get_size = br_get_size,
847 .fill_info = br_fill_info,
848
849 .slave_maxtype = IFLA_BRPORT_MAX,
850 .slave_policy = br_port_policy,
851 .slave_changelink = br_port_slave_changelink,
852 .get_slave_size = br_port_get_slave_size,
853 .fill_slave_info = br_port_fill_slave_info,
854 };
855
856 int __init br_netlink_init(void)
857 {
858 int err;
859
860 br_mdb_init();
861 rtnl_af_register(&br_af_ops);
862
863 err = rtnl_link_register(&br_link_ops);
864 if (err)
865 goto out_af;
866
867 return 0;
868
869 out_af:
870 rtnl_af_unregister(&br_af_ops);
871 br_mdb_uninit();
872 return err;
873 }
874
875 void br_netlink_fini(void)
876 {
877 br_mdb_uninit();
878 rtnl_af_unregister(&br_af_ops);
879 rtnl_link_unregister(&br_link_ops);
880 }
ubuntu-bionic-kernel mirror