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
br_get_num_vlan_infos(const struct net_port_vlans * pv,u32 filter_mask)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
br_get_link_af_size_filtered(const struct net_device * dev,u32 filter_mask)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
br_port_info_size(void)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 + nla_total_size(1) /* IFLA_BRPORT_PROXYARP_WIFI */
117 + 0;
118 }
119
br_nlmsg_size(struct net_device * dev,u32 filter_mask)120 static inline size_t br_nlmsg_size(struct net_device *dev, u32 filter_mask)
121 {
122 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
123 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
124 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
125 + nla_total_size(4) /* IFLA_MASTER */
126 + nla_total_size(4) /* IFLA_MTU */
127 + nla_total_size(4) /* IFLA_LINK */
128 + nla_total_size(1) /* IFLA_OPERSTATE */
129 + nla_total_size(br_port_info_size()) /* IFLA_PROTINFO */
130 + nla_total_size(br_get_link_af_size_filtered(dev,
131 filter_mask)); /* IFLA_AF_SPEC */
132 }
133
br_port_fill_attrs(struct sk_buff * skb,const struct net_bridge_port * p)134 static int br_port_fill_attrs(struct sk_buff *skb,
135 const struct net_bridge_port *p)
136 {
137 u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
138
139 if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
140 nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
141 nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
142 nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
143 nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
144 nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
145 nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
146 nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
147 nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)) ||
148 nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)) ||
149 nla_put_u8(skb, IFLA_BRPORT_PROXYARP_WIFI,
150 !!(p->flags & BR_PROXYARP_WIFI)))
151 return -EMSGSIZE;
152
153 return 0;
154 }
155
br_fill_ifvlaninfo_range(struct sk_buff * skb,u16 vid_start,u16 vid_end,u16 flags)156 static int br_fill_ifvlaninfo_range(struct sk_buff *skb, u16 vid_start,
157 u16 vid_end, u16 flags)
158 {
159 struct bridge_vlan_info vinfo;
160
161 if ((vid_end - vid_start) > 0) {
162 /* add range to skb */
163 vinfo.vid = vid_start;
164 vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_BEGIN;
165 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
166 sizeof(vinfo), &vinfo))
167 goto nla_put_failure;
168
169 vinfo.flags &= ~BRIDGE_VLAN_INFO_RANGE_BEGIN;
170
171 vinfo.vid = vid_end;
172 vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_END;
173 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
174 sizeof(vinfo), &vinfo))
175 goto nla_put_failure;
176 } else {
177 vinfo.vid = vid_start;
178 vinfo.flags = flags;
179 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
180 sizeof(vinfo), &vinfo))
181 goto nla_put_failure;
182 }
183
184 return 0;
185
186 nla_put_failure:
187 return -EMSGSIZE;
188 }
189
br_fill_ifvlaninfo_compressed(struct sk_buff * skb,const struct net_port_vlans * pv)190 static int br_fill_ifvlaninfo_compressed(struct sk_buff *skb,
191 const struct net_port_vlans *pv)
192 {
193 u16 vid_range_start = 0, vid_range_end = 0;
194 u16 vid_range_flags = 0;
195 u16 pvid, vid, flags;
196 int err = 0;
197
198 /* Pack IFLA_BRIDGE_VLAN_INFO's for every vlan
199 * and mark vlan info with begin and end flags
200 * if vlaninfo represents a range
201 */
202 pvid = br_get_pvid(pv);
203 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
204 flags = 0;
205 if (vid == pvid)
206 flags |= BRIDGE_VLAN_INFO_PVID;
207
208 if (test_bit(vid, pv->untagged_bitmap))
209 flags |= BRIDGE_VLAN_INFO_UNTAGGED;
210
211 if (vid_range_start == 0) {
212 goto initvars;
213 } else if ((vid - vid_range_end) == 1 &&
214 flags == vid_range_flags) {
215 vid_range_end = vid;
216 continue;
217 } else {
218 err = br_fill_ifvlaninfo_range(skb, vid_range_start,
219 vid_range_end,
220 vid_range_flags);
221 if (err)
222 return err;
223 }
224
225 initvars:
226 vid_range_start = vid;
227 vid_range_end = vid;
228 vid_range_flags = flags;
229 }
230
231 if (vid_range_start != 0) {
232 /* Call it once more to send any left over vlans */
233 err = br_fill_ifvlaninfo_range(skb, vid_range_start,
234 vid_range_end,
235 vid_range_flags);
236 if (err)
237 return err;
238 }
239
240 return 0;
241 }
242
br_fill_ifvlaninfo(struct sk_buff * skb,const struct net_port_vlans * pv)243 static int br_fill_ifvlaninfo(struct sk_buff *skb,
244 const struct net_port_vlans *pv)
245 {
246 struct bridge_vlan_info vinfo;
247 u16 pvid, vid;
248
249 pvid = br_get_pvid(pv);
250 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
251 vinfo.vid = vid;
252 vinfo.flags = 0;
253 if (vid == pvid)
254 vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
255
256 if (test_bit(vid, pv->untagged_bitmap))
257 vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
258
259 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
260 sizeof(vinfo), &vinfo))
261 goto nla_put_failure;
262 }
263
264 return 0;
265
266 nla_put_failure:
267 return -EMSGSIZE;
268 }
269
270 /*
271 * Create one netlink message for one interface
272 * Contains port and master info as well as carrier and bridge state.
273 */
br_fill_ifinfo(struct sk_buff * skb,const struct net_bridge_port * port,u32 pid,u32 seq,int event,unsigned int flags,u32 filter_mask,const struct net_device * dev)274 static int br_fill_ifinfo(struct sk_buff *skb,
275 const struct net_bridge_port *port,
276 u32 pid, u32 seq, int event, unsigned int flags,
277 u32 filter_mask, const struct net_device *dev)
278 {
279 const struct net_bridge *br;
280 struct ifinfomsg *hdr;
281 struct nlmsghdr *nlh;
282 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
283
284 if (port)
285 br = port->br;
286 else
287 br = netdev_priv(dev);
288
289 br_debug(br, "br_fill_info event %d port %s master %s\n",
290 event, dev->name, br->dev->name);
291
292 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
293 if (nlh == NULL)
294 return -EMSGSIZE;
295
296 hdr = nlmsg_data(nlh);
297 hdr->ifi_family = AF_BRIDGE;
298 hdr->__ifi_pad = 0;
299 hdr->ifi_type = dev->type;
300 hdr->ifi_index = dev->ifindex;
301 hdr->ifi_flags = dev_get_flags(dev);
302 hdr->ifi_change = 0;
303
304 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
305 nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
306 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
307 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
308 (dev->addr_len &&
309 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
310 (dev->ifindex != dev_get_iflink(dev) &&
311 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
312 goto nla_put_failure;
313
314 if (event == RTM_NEWLINK && port) {
315 struct nlattr *nest
316 = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
317
318 if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
319 goto nla_put_failure;
320 nla_nest_end(skb, nest);
321 }
322
323 /* Check if the VID information is requested */
324 if ((filter_mask & RTEXT_FILTER_BRVLAN) ||
325 (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) {
326 const struct net_port_vlans *pv;
327 struct nlattr *af;
328 int err;
329
330 if (port)
331 pv = nbp_get_vlan_info(port);
332 else
333 pv = br_get_vlan_info(br);
334
335 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
336 goto done;
337
338 af = nla_nest_start(skb, IFLA_AF_SPEC);
339 if (!af)
340 goto nla_put_failure;
341
342 if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
343 err = br_fill_ifvlaninfo_compressed(skb, pv);
344 else
345 err = br_fill_ifvlaninfo(skb, pv);
346 if (err)
347 goto nla_put_failure;
348 nla_nest_end(skb, af);
349 }
350
351 done:
352 nlmsg_end(skb, nlh);
353 return 0;
354
355 nla_put_failure:
356 nlmsg_cancel(skb, nlh);
357 return -EMSGSIZE;
358 }
359
360 /*
361 * Notify listeners of a change in port information
362 */
br_ifinfo_notify(int event,struct net_bridge_port * port)363 void br_ifinfo_notify(int event, struct net_bridge_port *port)
364 {
365 struct net *net;
366 struct sk_buff *skb;
367 int err = -ENOBUFS;
368 u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED;
369
370 if (!port)
371 return;
372
373 net = dev_net(port->dev);
374 br_debug(port->br, "port %u(%s) event %d\n",
375 (unsigned int)port->port_no, port->dev->name, event);
376
377 skb = nlmsg_new(br_nlmsg_size(port->dev, filter), GFP_ATOMIC);
378 if (skb == NULL)
379 goto errout;
380
381 err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, port->dev);
382 if (err < 0) {
383 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
384 WARN_ON(err == -EMSGSIZE);
385 kfree_skb(skb);
386 goto errout;
387 }
388 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
389 return;
390 errout:
391 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
392 }
393
394
395 /*
396 * Dump information about all ports, in response to GETLINK
397 */
br_getlink(struct sk_buff * skb,u32 pid,u32 seq,struct net_device * dev,u32 filter_mask,int nlflags)398 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
399 struct net_device *dev, u32 filter_mask, int nlflags)
400 {
401 struct net_bridge_port *port = br_port_get_rtnl(dev);
402
403 if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) &&
404 !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
405 return 0;
406
407 return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags,
408 filter_mask, dev);
409 }
410
br_vlan_info(struct net_bridge * br,struct net_bridge_port * p,int cmd,struct bridge_vlan_info * vinfo)411 static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p,
412 int cmd, struct bridge_vlan_info *vinfo)
413 {
414 int err = 0;
415
416 switch (cmd) {
417 case RTM_SETLINK:
418 if (p) {
419 err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
420 if (err)
421 break;
422
423 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
424 err = br_vlan_add(p->br, vinfo->vid,
425 vinfo->flags);
426 } else {
427 err = br_vlan_add(br, vinfo->vid, vinfo->flags);
428 }
429 break;
430
431 case RTM_DELLINK:
432 if (p) {
433 nbp_vlan_delete(p, vinfo->vid);
434 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
435 br_vlan_delete(p->br, vinfo->vid);
436 } else {
437 br_vlan_delete(br, vinfo->vid);
438 }
439 break;
440 }
441
442 return err;
443 }
444
br_afspec(struct net_bridge * br,struct net_bridge_port * p,struct nlattr * af_spec,int cmd)445 static int br_afspec(struct net_bridge *br,
446 struct net_bridge_port *p,
447 struct nlattr *af_spec,
448 int cmd)
449 {
450 struct bridge_vlan_info *vinfo_start = NULL;
451 struct bridge_vlan_info *vinfo = NULL;
452 struct nlattr *attr;
453 int err = 0;
454 int rem;
455
456 nla_for_each_nested(attr, af_spec, rem) {
457 if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
458 continue;
459 if (nla_len(attr) != sizeof(struct bridge_vlan_info))
460 return -EINVAL;
461 vinfo = nla_data(attr);
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 [IFLA_BRPORT_PROXYARP] = { .type = NLA_U8 },
510 [IFLA_BRPORT_PROXYARP_WIFI] = { .type = NLA_U8 },
511 };
512
513 /* Change the state of the port and notify spanning tree */
br_set_port_state(struct net_bridge_port * p,u8 state)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 */
br_set_port_flag(struct net_bridge_port * p,struct nlattr * tb[],int attrtype,unsigned long mask)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 */
br_setport(struct net_bridge_port * p,struct nlattr * tb[])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. */
br_setlink(struct net_device * dev,struct nlmsghdr * nlh,u16 flags)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, ret_offload = 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 (p && !(flags & BRIDGE_FLAGS_SELF)) {
636 /* set bridge attributes in hardware if supported
637 */
638 ret_offload = netdev_switch_port_bridge_setlink(dev, nlh,
639 flags);
640 if (ret_offload && ret_offload != -EOPNOTSUPP)
641 br_warn(p->br, "error setting attrs on port %u(%s)\n",
642 (unsigned int)p->port_no, p->dev->name);
643 }
644
645 if (err == 0)
646 br_ifinfo_notify(RTM_NEWLINK, p);
647 out:
648 return err;
649 }
650
651 /* Delete port information */
br_dellink(struct net_device * dev,struct nlmsghdr * nlh,u16 flags)652 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
653 {
654 struct nlattr *afspec;
655 struct net_bridge_port *p;
656 int err = 0, ret_offload = 0;
657
658 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
659 if (!afspec)
660 return 0;
661
662 p = br_port_get_rtnl(dev);
663 /* We want to accept dev as bridge itself as well */
664 if (!p && !(dev->priv_flags & IFF_EBRIDGE))
665 return -EINVAL;
666
667 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
668 afspec, RTM_DELLINK);
669 if (err == 0)
670 /* Send RTM_NEWLINK because userspace
671 * expects RTM_NEWLINK for vlan dels
672 */
673 br_ifinfo_notify(RTM_NEWLINK, p);
674
675 if (p && !(flags & BRIDGE_FLAGS_SELF)) {
676 /* del bridge attributes in hardware
677 */
678 ret_offload = netdev_switch_port_bridge_dellink(dev, nlh,
679 flags);
680 if (ret_offload && ret_offload != -EOPNOTSUPP)
681 br_warn(p->br, "error deleting attrs on port %u (%s)\n",
682 (unsigned int)p->port_no, p->dev->name);
683 }
684
685 return err;
686 }
br_validate(struct nlattr * tb[],struct nlattr * data[])687 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
688 {
689 if (tb[IFLA_ADDRESS]) {
690 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
691 return -EINVAL;
692 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
693 return -EADDRNOTAVAIL;
694 }
695
696 return 0;
697 }
698
br_dev_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[])699 static int br_dev_newlink(struct net *src_net, struct net_device *dev,
700 struct nlattr *tb[], struct nlattr *data[])
701 {
702 struct net_bridge *br = netdev_priv(dev);
703
704 if (tb[IFLA_ADDRESS]) {
705 spin_lock_bh(&br->lock);
706 br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
707 spin_unlock_bh(&br->lock);
708 }
709
710 return register_netdevice(dev);
711 }
712
br_port_slave_changelink(struct net_device * brdev,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[])713 static int br_port_slave_changelink(struct net_device *brdev,
714 struct net_device *dev,
715 struct nlattr *tb[],
716 struct nlattr *data[])
717 {
718 struct net_bridge *br = netdev_priv(brdev);
719 int ret;
720
721 if (!data)
722 return 0;
723
724 spin_lock_bh(&br->lock);
725 ret = br_setport(br_port_get_rtnl(dev), data);
726 spin_unlock_bh(&br->lock);
727
728 return ret;
729 }
730
br_port_fill_slave_info(struct sk_buff * skb,const struct net_device * brdev,const struct net_device * dev)731 static int br_port_fill_slave_info(struct sk_buff *skb,
732 const struct net_device *brdev,
733 const struct net_device *dev)
734 {
735 return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
736 }
737
br_port_get_slave_size(const struct net_device * brdev,const struct net_device * dev)738 static size_t br_port_get_slave_size(const struct net_device *brdev,
739 const struct net_device *dev)
740 {
741 return br_port_info_size();
742 }
743
744 static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
745 [IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 },
746 [IFLA_BR_HELLO_TIME] = { .type = NLA_U32 },
747 [IFLA_BR_MAX_AGE] = { .type = NLA_U32 },
748 [IFLA_BR_AGEING_TIME] = { .type = NLA_U32 },
749 [IFLA_BR_STP_STATE] = { .type = NLA_U32 },
750 [IFLA_BR_PRIORITY] = { .type = NLA_U16 },
751 };
752
br_changelink(struct net_device * brdev,struct nlattr * tb[],struct nlattr * data[])753 static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
754 struct nlattr *data[])
755 {
756 struct net_bridge *br = netdev_priv(brdev);
757 int err;
758
759 if (!data)
760 return 0;
761
762 if (data[IFLA_BR_FORWARD_DELAY]) {
763 err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
764 if (err)
765 return err;
766 }
767
768 if (data[IFLA_BR_HELLO_TIME]) {
769 err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
770 if (err)
771 return err;
772 }
773
774 if (data[IFLA_BR_MAX_AGE]) {
775 err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
776 if (err)
777 return err;
778 }
779
780 if (data[IFLA_BR_AGEING_TIME]) {
781 u32 ageing_time = nla_get_u32(data[IFLA_BR_AGEING_TIME]);
782
783 br->ageing_time = clock_t_to_jiffies(ageing_time);
784 }
785
786 if (data[IFLA_BR_STP_STATE]) {
787 u32 stp_enabled = nla_get_u32(data[IFLA_BR_STP_STATE]);
788
789 br_stp_set_enabled(br, stp_enabled);
790 }
791
792 if (data[IFLA_BR_PRIORITY]) {
793 u32 priority = nla_get_u16(data[IFLA_BR_PRIORITY]);
794
795 br_stp_set_bridge_priority(br, priority);
796 }
797
798 return 0;
799 }
800
br_get_size(const struct net_device * brdev)801 static size_t br_get_size(const struct net_device *brdev)
802 {
803 return nla_total_size(sizeof(u32)) + /* IFLA_BR_FORWARD_DELAY */
804 nla_total_size(sizeof(u32)) + /* IFLA_BR_HELLO_TIME */
805 nla_total_size(sizeof(u32)) + /* IFLA_BR_MAX_AGE */
806 nla_total_size(sizeof(u32)) + /* IFLA_BR_AGEING_TIME */
807 nla_total_size(sizeof(u32)) + /* IFLA_BR_STP_STATE */
808 nla_total_size(sizeof(u16)) + /* IFLA_BR_PRIORITY */
809 0;
810 }
811
br_fill_info(struct sk_buff * skb,const struct net_device * brdev)812 static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
813 {
814 struct net_bridge *br = netdev_priv(brdev);
815 u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
816 u32 hello_time = jiffies_to_clock_t(br->hello_time);
817 u32 age_time = jiffies_to_clock_t(br->max_age);
818 u32 ageing_time = jiffies_to_clock_t(br->ageing_time);
819 u32 stp_enabled = br->stp_enabled;
820 u16 priority = (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1];
821
822 if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) ||
823 nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) ||
824 nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time) ||
825 nla_put_u32(skb, IFLA_BR_AGEING_TIME, ageing_time) ||
826 nla_put_u32(skb, IFLA_BR_STP_STATE, stp_enabled) ||
827 nla_put_u16(skb, IFLA_BR_PRIORITY, priority))
828 return -EMSGSIZE;
829
830 return 0;
831 }
832
br_get_link_af_size(const struct net_device * dev)833 static size_t br_get_link_af_size(const struct net_device *dev)
834 {
835 struct net_port_vlans *pv;
836
837 if (br_port_exists(dev))
838 pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
839 else if (dev->priv_flags & IFF_EBRIDGE)
840 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
841 else
842 return 0;
843
844 if (!pv)
845 return 0;
846
847 /* Each VLAN is returned in bridge_vlan_info along with flags */
848 return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
849 }
850
851 static struct rtnl_af_ops br_af_ops __read_mostly = {
852 .family = AF_BRIDGE,
853 .get_link_af_size = br_get_link_af_size,
854 };
855
856 struct rtnl_link_ops br_link_ops __read_mostly = {
857 .kind = "bridge",
858 .priv_size = sizeof(struct net_bridge),
859 .setup = br_dev_setup,
860 .maxtype = IFLA_BRPORT_MAX,
861 .policy = br_policy,
862 .validate = br_validate,
863 .newlink = br_dev_newlink,
864 .changelink = br_changelink,
865 .dellink = br_dev_delete,
866 .get_size = br_get_size,
867 .fill_info = br_fill_info,
868
869 .slave_maxtype = IFLA_BRPORT_MAX,
870 .slave_policy = br_port_policy,
871 .slave_changelink = br_port_slave_changelink,
872 .get_slave_size = br_port_get_slave_size,
873 .fill_slave_info = br_port_fill_slave_info,
874 };
875
br_netlink_init(void)876 int __init br_netlink_init(void)
877 {
878 int err;
879
880 br_mdb_init();
881 rtnl_af_register(&br_af_ops);
882
883 err = rtnl_link_register(&br_link_ops);
884 if (err)
885 goto out_af;
886
887 return 0;
888
889 out_af:
890 rtnl_af_unregister(&br_af_ops);
891 br_mdb_uninit();
892 return err;
893 }
894
br_netlink_fini(void)895 void br_netlink_fini(void)
896 {
897 br_mdb_uninit();
898 rtnl_af_unregister(&br_af_ops);
899 rtnl_link_unregister(&br_link_ops);
900 }
901