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1 | /* | |
2 | * Bridge netlink control interface | |
3 | * | |
4 | * Authors: | |
5 | * Stephen Hemminger <shemminger@osdl.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/etherdevice.h> | |
16 | #include <net/rtnetlink.h> | |
17 | #include <net/net_namespace.h> | |
18 | #include <net/sock.h> | |
19 | #include <uapi/linux/if_bridge.h> | |
20 | ||
21 | #include "br_private.h" | |
22 | #include "br_private_stp.h" | |
23 | ||
24 | static int __get_num_vlan_infos(struct net_bridge_vlan_group *vg, | |
25 | u32 filter_mask) | |
26 | { | |
27 | struct net_bridge_vlan *v; | |
28 | u16 vid_range_start = 0, vid_range_end = 0, vid_range_flags = 0; | |
29 | u16 flags, pvid; | |
30 | int num_vlans = 0; | |
31 | ||
32 | if (!(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) | |
33 | return 0; | |
34 | ||
35 | pvid = br_get_pvid(vg); | |
36 | /* Count number of vlan infos */ | |
37 | list_for_each_entry_rcu(v, &vg->vlan_list, vlist) { | |
38 | flags = 0; | |
39 | /* only a context, bridge vlan not activated */ | |
40 | if (!br_vlan_should_use(v)) | |
41 | continue; | |
42 | if (v->vid == pvid) | |
43 | flags |= BRIDGE_VLAN_INFO_PVID; | |
44 | ||
45 | if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED) | |
46 | flags |= BRIDGE_VLAN_INFO_UNTAGGED; | |
47 | ||
48 | if (vid_range_start == 0) { | |
49 | goto initvars; | |
50 | } else if ((v->vid - vid_range_end) == 1 && | |
51 | flags == vid_range_flags) { | |
52 | vid_range_end = v->vid; | |
53 | continue; | |
54 | } else { | |
55 | if ((vid_range_end - vid_range_start) > 0) | |
56 | num_vlans += 2; | |
57 | else | |
58 | num_vlans += 1; | |
59 | } | |
60 | initvars: | |
61 | vid_range_start = v->vid; | |
62 | vid_range_end = v->vid; | |
63 | vid_range_flags = flags; | |
64 | } | |
65 | ||
66 | if (vid_range_start != 0) { | |
67 | if ((vid_range_end - vid_range_start) > 0) | |
68 | num_vlans += 2; | |
69 | else | |
70 | num_vlans += 1; | |
71 | } | |
72 | ||
73 | return num_vlans; | |
74 | } | |
75 | ||
76 | static int br_get_num_vlan_infos(struct net_bridge_vlan_group *vg, | |
77 | u32 filter_mask) | |
78 | { | |
79 | int num_vlans; | |
80 | ||
81 | if (!vg) | |
82 | return 0; | |
83 | ||
84 | if (filter_mask & RTEXT_FILTER_BRVLAN) | |
85 | return vg->num_vlans; | |
86 | ||
87 | rcu_read_lock(); | |
88 | num_vlans = __get_num_vlan_infos(vg, filter_mask); | |
89 | rcu_read_unlock(); | |
90 | ||
91 | return num_vlans; | |
92 | } | |
93 | ||
94 | static size_t br_get_link_af_size_filtered(const struct net_device *dev, | |
95 | u32 filter_mask) | |
96 | { | |
97 | struct net_bridge_vlan_group *vg = NULL; | |
98 | struct net_bridge_port *p; | |
99 | struct net_bridge *br; | |
100 | int num_vlan_infos; | |
101 | ||
102 | rcu_read_lock(); | |
103 | if (br_port_exists(dev)) { | |
104 | p = br_port_get_rcu(dev); | |
105 | vg = nbp_vlan_group(p); | |
106 | } else if (dev->priv_flags & IFF_EBRIDGE) { | |
107 | br = netdev_priv(dev); | |
108 | vg = br_vlan_group(br); | |
109 | } | |
110 | num_vlan_infos = br_get_num_vlan_infos(vg, filter_mask); | |
111 | rcu_read_unlock(); | |
112 | ||
113 | /* Each VLAN is returned in bridge_vlan_info along with flags */ | |
114 | return num_vlan_infos * nla_total_size(sizeof(struct bridge_vlan_info)); | |
115 | } | |
116 | ||
117 | static inline size_t br_port_info_size(void) | |
118 | { | |
119 | return nla_total_size(1) /* IFLA_BRPORT_STATE */ | |
120 | + nla_total_size(2) /* IFLA_BRPORT_PRIORITY */ | |
121 | + nla_total_size(4) /* IFLA_BRPORT_COST */ | |
122 | + nla_total_size(1) /* IFLA_BRPORT_MODE */ | |
123 | + nla_total_size(1) /* IFLA_BRPORT_GUARD */ | |
124 | + nla_total_size(1) /* IFLA_BRPORT_PROTECT */ | |
125 | + nla_total_size(1) /* IFLA_BRPORT_FAST_LEAVE */ | |
126 | + nla_total_size(1) /* IFLA_BRPORT_LEARNING */ | |
127 | + nla_total_size(1) /* IFLA_BRPORT_UNICAST_FLOOD */ | |
128 | + nla_total_size(1) /* IFLA_BRPORT_PROXYARP */ | |
129 | + nla_total_size(1) /* IFLA_BRPORT_PROXYARP_WIFI */ | |
130 | + 0; | |
131 | } | |
132 | ||
133 | static inline size_t br_nlmsg_size(struct net_device *dev, u32 filter_mask) | |
134 | { | |
135 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) | |
136 | + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ | |
137 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ | |
138 | + nla_total_size(4) /* IFLA_MASTER */ | |
139 | + nla_total_size(4) /* IFLA_MTU */ | |
140 | + nla_total_size(4) /* IFLA_LINK */ | |
141 | + nla_total_size(1) /* IFLA_OPERSTATE */ | |
142 | + nla_total_size(br_port_info_size()) /* IFLA_PROTINFO */ | |
143 | + nla_total_size(br_get_link_af_size_filtered(dev, | |
144 | filter_mask)); /* IFLA_AF_SPEC */ | |
145 | } | |
146 | ||
147 | static int br_port_fill_attrs(struct sk_buff *skb, | |
148 | const struct net_bridge_port *p) | |
149 | { | |
150 | u8 mode = !!(p->flags & BR_HAIRPIN_MODE); | |
151 | ||
152 | if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) || | |
153 | nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) || | |
154 | nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) || | |
155 | nla_put_u8(skb, IFLA_BRPORT_MODE, mode) || | |
156 | nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) || | |
157 | nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) || | |
158 | nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) || | |
159 | nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) || | |
160 | nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)) || | |
161 | nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)) || | |
162 | nla_put_u8(skb, IFLA_BRPORT_PROXYARP_WIFI, | |
163 | !!(p->flags & BR_PROXYARP_WIFI))) | |
164 | return -EMSGSIZE; | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | static int br_fill_ifvlaninfo_range(struct sk_buff *skb, u16 vid_start, | |
170 | u16 vid_end, u16 flags) | |
171 | { | |
172 | struct bridge_vlan_info vinfo; | |
173 | ||
174 | if ((vid_end - vid_start) > 0) { | |
175 | /* add range to skb */ | |
176 | vinfo.vid = vid_start; | |
177 | vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_BEGIN; | |
178 | if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO, | |
179 | sizeof(vinfo), &vinfo)) | |
180 | goto nla_put_failure; | |
181 | ||
182 | vinfo.vid = vid_end; | |
183 | vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_END; | |
184 | if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO, | |
185 | sizeof(vinfo), &vinfo)) | |
186 | goto nla_put_failure; | |
187 | } else { | |
188 | vinfo.vid = vid_start; | |
189 | vinfo.flags = flags; | |
190 | if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO, | |
191 | sizeof(vinfo), &vinfo)) | |
192 | goto nla_put_failure; | |
193 | } | |
194 | ||
195 | return 0; | |
196 | ||
197 | nla_put_failure: | |
198 | return -EMSGSIZE; | |
199 | } | |
200 | ||
201 | static int br_fill_ifvlaninfo_compressed(struct sk_buff *skb, | |
202 | struct net_bridge_vlan_group *vg) | |
203 | { | |
204 | struct net_bridge_vlan *v; | |
205 | u16 vid_range_start = 0, vid_range_end = 0, vid_range_flags = 0; | |
206 | u16 flags, pvid; | |
207 | int err = 0; | |
208 | ||
209 | /* Pack IFLA_BRIDGE_VLAN_INFO's for every vlan | |
210 | * and mark vlan info with begin and end flags | |
211 | * if vlaninfo represents a range | |
212 | */ | |
213 | pvid = br_get_pvid(vg); | |
214 | list_for_each_entry(v, &vg->vlan_list, vlist) { | |
215 | flags = 0; | |
216 | if (!br_vlan_should_use(v)) | |
217 | continue; | |
218 | if (v->vid == pvid) | |
219 | flags |= BRIDGE_VLAN_INFO_PVID; | |
220 | ||
221 | if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED) | |
222 | flags |= BRIDGE_VLAN_INFO_UNTAGGED; | |
223 | ||
224 | if (vid_range_start == 0) { | |
225 | goto initvars; | |
226 | } else if ((v->vid - vid_range_end) == 1 && | |
227 | flags == vid_range_flags) { | |
228 | vid_range_end = v->vid; | |
229 | continue; | |
230 | } else { | |
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 | initvars: | |
239 | vid_range_start = v->vid; | |
240 | vid_range_end = v->vid; | |
241 | vid_range_flags = flags; | |
242 | } | |
243 | ||
244 | if (vid_range_start != 0) { | |
245 | /* Call it once more to send any left over vlans */ | |
246 | err = br_fill_ifvlaninfo_range(skb, vid_range_start, | |
247 | vid_range_end, | |
248 | vid_range_flags); | |
249 | if (err) | |
250 | return err; | |
251 | } | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | static int br_fill_ifvlaninfo(struct sk_buff *skb, | |
257 | struct net_bridge_vlan_group *vg) | |
258 | { | |
259 | struct bridge_vlan_info vinfo; | |
260 | struct net_bridge_vlan *v; | |
261 | u16 pvid; | |
262 | ||
263 | pvid = br_get_pvid(vg); | |
264 | list_for_each_entry(v, &vg->vlan_list, vlist) { | |
265 | if (!br_vlan_should_use(v)) | |
266 | continue; | |
267 | ||
268 | vinfo.vid = v->vid; | |
269 | vinfo.flags = 0; | |
270 | if (v->vid == pvid) | |
271 | vinfo.flags |= BRIDGE_VLAN_INFO_PVID; | |
272 | ||
273 | if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED) | |
274 | vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED; | |
275 | ||
276 | if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO, | |
277 | sizeof(vinfo), &vinfo)) | |
278 | goto nla_put_failure; | |
279 | } | |
280 | ||
281 | return 0; | |
282 | ||
283 | nla_put_failure: | |
284 | return -EMSGSIZE; | |
285 | } | |
286 | ||
287 | /* | |
288 | * Create one netlink message for one interface | |
289 | * Contains port and master info as well as carrier and bridge state. | |
290 | */ | |
291 | static int br_fill_ifinfo(struct sk_buff *skb, | |
292 | struct net_bridge_port *port, | |
293 | u32 pid, u32 seq, int event, unsigned int flags, | |
294 | u32 filter_mask, const struct net_device *dev) | |
295 | { | |
296 | struct net_bridge *br; | |
297 | struct ifinfomsg *hdr; | |
298 | struct nlmsghdr *nlh; | |
299 | u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; | |
300 | ||
301 | if (port) | |
302 | br = port->br; | |
303 | else | |
304 | br = netdev_priv(dev); | |
305 | ||
306 | br_debug(br, "br_fill_info event %d port %s master %s\n", | |
307 | event, dev->name, br->dev->name); | |
308 | ||
309 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); | |
310 | if (nlh == NULL) | |
311 | return -EMSGSIZE; | |
312 | ||
313 | hdr = nlmsg_data(nlh); | |
314 | hdr->ifi_family = AF_BRIDGE; | |
315 | hdr->__ifi_pad = 0; | |
316 | hdr->ifi_type = dev->type; | |
317 | hdr->ifi_index = dev->ifindex; | |
318 | hdr->ifi_flags = dev_get_flags(dev); | |
319 | hdr->ifi_change = 0; | |
320 | ||
321 | if (nla_put_string(skb, IFLA_IFNAME, dev->name) || | |
322 | nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) || | |
323 | nla_put_u32(skb, IFLA_MTU, dev->mtu) || | |
324 | nla_put_u8(skb, IFLA_OPERSTATE, operstate) || | |
325 | (dev->addr_len && | |
326 | nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || | |
327 | (dev->ifindex != dev_get_iflink(dev) && | |
328 | nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) | |
329 | goto nla_put_failure; | |
330 | ||
331 | if (event == RTM_NEWLINK && port) { | |
332 | struct nlattr *nest | |
333 | = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); | |
334 | ||
335 | if (nest == NULL || br_port_fill_attrs(skb, port) < 0) | |
336 | goto nla_put_failure; | |
337 | nla_nest_end(skb, nest); | |
338 | } | |
339 | ||
340 | /* Check if the VID information is requested */ | |
341 | if ((filter_mask & RTEXT_FILTER_BRVLAN) || | |
342 | (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) { | |
343 | struct net_bridge_vlan_group *vg; | |
344 | struct nlattr *af; | |
345 | int err; | |
346 | ||
347 | if (port) | |
348 | vg = nbp_vlan_group(port); | |
349 | else | |
350 | vg = br_vlan_group(br); | |
351 | ||
352 | if (!vg || !vg->num_vlans) | |
353 | goto done; | |
354 | ||
355 | af = nla_nest_start(skb, IFLA_AF_SPEC); | |
356 | if (!af) | |
357 | goto nla_put_failure; | |
358 | ||
359 | if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED) | |
360 | err = br_fill_ifvlaninfo_compressed(skb, vg); | |
361 | else | |
362 | err = br_fill_ifvlaninfo(skb, vg); | |
363 | if (err) | |
364 | goto nla_put_failure; | |
365 | nla_nest_end(skb, af); | |
366 | } | |
367 | ||
368 | done: | |
369 | nlmsg_end(skb, nlh); | |
370 | return 0; | |
371 | ||
372 | nla_put_failure: | |
373 | nlmsg_cancel(skb, nlh); | |
374 | return -EMSGSIZE; | |
375 | } | |
376 | ||
377 | /* | |
378 | * Notify listeners of a change in port information | |
379 | */ | |
380 | void br_ifinfo_notify(int event, struct net_bridge_port *port) | |
381 | { | |
382 | struct net *net; | |
383 | struct sk_buff *skb; | |
384 | int err = -ENOBUFS; | |
385 | u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED; | |
386 | ||
387 | if (!port) | |
388 | return; | |
389 | ||
390 | net = dev_net(port->dev); | |
391 | br_debug(port->br, "port %u(%s) event %d\n", | |
392 | (unsigned int)port->port_no, port->dev->name, event); | |
393 | ||
394 | skb = nlmsg_new(br_nlmsg_size(port->dev, filter), GFP_ATOMIC); | |
395 | if (skb == NULL) | |
396 | goto errout; | |
397 | ||
398 | err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, port->dev); | |
399 | if (err < 0) { | |
400 | /* -EMSGSIZE implies BUG in br_nlmsg_size() */ | |
401 | WARN_ON(err == -EMSGSIZE); | |
402 | kfree_skb(skb); | |
403 | goto errout; | |
404 | } | |
405 | rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); | |
406 | return; | |
407 | errout: | |
408 | rtnl_set_sk_err(net, RTNLGRP_LINK, err); | |
409 | } | |
410 | ||
411 | ||
412 | /* | |
413 | * Dump information about all ports, in response to GETLINK | |
414 | */ | |
415 | int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, | |
416 | struct net_device *dev, u32 filter_mask, int nlflags) | |
417 | { | |
418 | struct net_bridge_port *port = br_port_get_rtnl(dev); | |
419 | ||
420 | if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) && | |
421 | !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) | |
422 | return 0; | |
423 | ||
424 | return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags, | |
425 | filter_mask, dev); | |
426 | } | |
427 | ||
428 | static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p, | |
429 | int cmd, struct bridge_vlan_info *vinfo) | |
430 | { | |
431 | int err = 0; | |
432 | ||
433 | switch (cmd) { | |
434 | case RTM_SETLINK: | |
435 | if (p) { | |
436 | /* if the MASTER flag is set this will act on the global | |
437 | * per-VLAN entry as well | |
438 | */ | |
439 | err = nbp_vlan_add(p, vinfo->vid, vinfo->flags); | |
440 | if (err) | |
441 | break; | |
442 | } else { | |
443 | vinfo->flags |= BRIDGE_VLAN_INFO_BRENTRY; | |
444 | err = br_vlan_add(br, vinfo->vid, vinfo->flags); | |
445 | } | |
446 | break; | |
447 | ||
448 | case RTM_DELLINK: | |
449 | if (p) { | |
450 | nbp_vlan_delete(p, vinfo->vid); | |
451 | if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER) | |
452 | br_vlan_delete(p->br, vinfo->vid); | |
453 | } else { | |
454 | br_vlan_delete(br, vinfo->vid); | |
455 | } | |
456 | break; | |
457 | } | |
458 | ||
459 | return err; | |
460 | } | |
461 | ||
462 | static int br_afspec(struct net_bridge *br, | |
463 | struct net_bridge_port *p, | |
464 | struct nlattr *af_spec, | |
465 | int cmd) | |
466 | { | |
467 | struct bridge_vlan_info *vinfo_start = NULL; | |
468 | struct bridge_vlan_info *vinfo = NULL; | |
469 | struct nlattr *attr; | |
470 | int err = 0; | |
471 | int rem; | |
472 | ||
473 | nla_for_each_nested(attr, af_spec, rem) { | |
474 | if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO) | |
475 | continue; | |
476 | if (nla_len(attr) != sizeof(struct bridge_vlan_info)) | |
477 | return -EINVAL; | |
478 | vinfo = nla_data(attr); | |
479 | if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK) | |
480 | return -EINVAL; | |
481 | if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) { | |
482 | if (vinfo_start) | |
483 | return -EINVAL; | |
484 | vinfo_start = vinfo; | |
485 | continue; | |
486 | } | |
487 | ||
488 | if (vinfo_start) { | |
489 | struct bridge_vlan_info tmp_vinfo; | |
490 | int v; | |
491 | ||
492 | if (!(vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END)) | |
493 | return -EINVAL; | |
494 | ||
495 | if (vinfo->vid <= vinfo_start->vid) | |
496 | return -EINVAL; | |
497 | ||
498 | memcpy(&tmp_vinfo, vinfo_start, | |
499 | sizeof(struct bridge_vlan_info)); | |
500 | ||
501 | for (v = vinfo_start->vid; v <= vinfo->vid; v++) { | |
502 | tmp_vinfo.vid = v; | |
503 | err = br_vlan_info(br, p, cmd, &tmp_vinfo); | |
504 | if (err) | |
505 | break; | |
506 | } | |
507 | vinfo_start = NULL; | |
508 | } else { | |
509 | err = br_vlan_info(br, p, cmd, vinfo); | |
510 | } | |
511 | if (err) | |
512 | break; | |
513 | } | |
514 | ||
515 | return err; | |
516 | } | |
517 | ||
518 | static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = { | |
519 | [IFLA_BRPORT_STATE] = { .type = NLA_U8 }, | |
520 | [IFLA_BRPORT_COST] = { .type = NLA_U32 }, | |
521 | [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 }, | |
522 | [IFLA_BRPORT_MODE] = { .type = NLA_U8 }, | |
523 | [IFLA_BRPORT_GUARD] = { .type = NLA_U8 }, | |
524 | [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 }, | |
525 | [IFLA_BRPORT_FAST_LEAVE]= { .type = NLA_U8 }, | |
526 | [IFLA_BRPORT_LEARNING] = { .type = NLA_U8 }, | |
527 | [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 }, | |
528 | [IFLA_BRPORT_PROXYARP] = { .type = NLA_U8 }, | |
529 | [IFLA_BRPORT_PROXYARP_WIFI] = { .type = NLA_U8 }, | |
530 | }; | |
531 | ||
532 | /* Change the state of the port and notify spanning tree */ | |
533 | static int br_set_port_state(struct net_bridge_port *p, u8 state) | |
534 | { | |
535 | if (state > BR_STATE_BLOCKING) | |
536 | return -EINVAL; | |
537 | ||
538 | /* if kernel STP is running, don't allow changes */ | |
539 | if (p->br->stp_enabled == BR_KERNEL_STP) | |
540 | return -EBUSY; | |
541 | ||
542 | /* if device is not up, change is not allowed | |
543 | * if link is not present, only allowable state is disabled | |
544 | */ | |
545 | if (!netif_running(p->dev) || | |
546 | (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED)) | |
547 | return -ENETDOWN; | |
548 | ||
549 | br_set_state(p, state); | |
550 | br_log_state(p); | |
551 | br_port_state_selection(p->br); | |
552 | return 0; | |
553 | } | |
554 | ||
555 | /* Set/clear or port flags based on attribute */ | |
556 | static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[], | |
557 | int attrtype, unsigned long mask) | |
558 | { | |
559 | if (tb[attrtype]) { | |
560 | u8 flag = nla_get_u8(tb[attrtype]); | |
561 | if (flag) | |
562 | p->flags |= mask; | |
563 | else | |
564 | p->flags &= ~mask; | |
565 | } | |
566 | } | |
567 | ||
568 | /* Process bridge protocol info on port */ | |
569 | static int br_setport(struct net_bridge_port *p, struct nlattr *tb[]) | |
570 | { | |
571 | int err; | |
572 | unsigned long old_flags = p->flags; | |
573 | ||
574 | br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE); | |
575 | br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD); | |
576 | br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE); | |
577 | br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK); | |
578 | br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING); | |
579 | br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD); | |
580 | br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP); | |
581 | br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI); | |
582 | ||
583 | if (tb[IFLA_BRPORT_COST]) { | |
584 | err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST])); | |
585 | if (err) | |
586 | return err; | |
587 | } | |
588 | ||
589 | if (tb[IFLA_BRPORT_PRIORITY]) { | |
590 | err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY])); | |
591 | if (err) | |
592 | return err; | |
593 | } | |
594 | ||
595 | if (tb[IFLA_BRPORT_STATE]) { | |
596 | err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE])); | |
597 | if (err) | |
598 | return err; | |
599 | } | |
600 | ||
601 | br_port_flags_change(p, old_flags ^ p->flags); | |
602 | return 0; | |
603 | } | |
604 | ||
605 | /* Change state and parameters on port. */ | |
606 | int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags) | |
607 | { | |
608 | struct nlattr *protinfo; | |
609 | struct nlattr *afspec; | |
610 | struct net_bridge_port *p; | |
611 | struct nlattr *tb[IFLA_BRPORT_MAX + 1]; | |
612 | int err = 0; | |
613 | ||
614 | protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO); | |
615 | afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); | |
616 | if (!protinfo && !afspec) | |
617 | return 0; | |
618 | ||
619 | p = br_port_get_rtnl(dev); | |
620 | /* We want to accept dev as bridge itself if the AF_SPEC | |
621 | * is set to see if someone is setting vlan info on the bridge | |
622 | */ | |
623 | if (!p && !afspec) | |
624 | return -EINVAL; | |
625 | ||
626 | if (p && protinfo) { | |
627 | if (protinfo->nla_type & NLA_F_NESTED) { | |
628 | err = nla_parse_nested(tb, IFLA_BRPORT_MAX, | |
629 | protinfo, br_port_policy); | |
630 | if (err) | |
631 | return err; | |
632 | ||
633 | spin_lock_bh(&p->br->lock); | |
634 | err = br_setport(p, tb); | |
635 | spin_unlock_bh(&p->br->lock); | |
636 | } else { | |
637 | /* Binary compatibility with old RSTP */ | |
638 | if (nla_len(protinfo) < sizeof(u8)) | |
639 | return -EINVAL; | |
640 | ||
641 | spin_lock_bh(&p->br->lock); | |
642 | err = br_set_port_state(p, nla_get_u8(protinfo)); | |
643 | spin_unlock_bh(&p->br->lock); | |
644 | } | |
645 | if (err) | |
646 | goto out; | |
647 | } | |
648 | ||
649 | if (afspec) { | |
650 | err = br_afspec((struct net_bridge *)netdev_priv(dev), p, | |
651 | afspec, RTM_SETLINK); | |
652 | } | |
653 | ||
654 | if (err == 0) | |
655 | br_ifinfo_notify(RTM_NEWLINK, p); | |
656 | out: | |
657 | return err; | |
658 | } | |
659 | ||
660 | /* Delete port information */ | |
661 | int br_dellink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags) | |
662 | { | |
663 | struct nlattr *afspec; | |
664 | struct net_bridge_port *p; | |
665 | int err = 0; | |
666 | ||
667 | afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); | |
668 | if (!afspec) | |
669 | return 0; | |
670 | ||
671 | p = br_port_get_rtnl(dev); | |
672 | /* We want to accept dev as bridge itself as well */ | |
673 | if (!p && !(dev->priv_flags & IFF_EBRIDGE)) | |
674 | return -EINVAL; | |
675 | ||
676 | err = br_afspec((struct net_bridge *)netdev_priv(dev), p, | |
677 | afspec, RTM_DELLINK); | |
678 | if (err == 0) | |
679 | /* Send RTM_NEWLINK because userspace | |
680 | * expects RTM_NEWLINK for vlan dels | |
681 | */ | |
682 | br_ifinfo_notify(RTM_NEWLINK, p); | |
683 | ||
684 | return err; | |
685 | } | |
686 | static int br_validate(struct nlattr *tb[], struct nlattr *data[]) | |
687 | { | |
688 | if (tb[IFLA_ADDRESS]) { | |
689 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
690 | return -EINVAL; | |
691 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
692 | return -EADDRNOTAVAIL; | |
693 | } | |
694 | ||
695 | if (!data) | |
696 | return 0; | |
697 | ||
698 | #ifdef CONFIG_BRIDGE_VLAN_FILTERING | |
699 | if (data[IFLA_BR_VLAN_PROTOCOL]) { | |
700 | switch (nla_get_be16(data[IFLA_BR_VLAN_PROTOCOL])) { | |
701 | case htons(ETH_P_8021Q): | |
702 | case htons(ETH_P_8021AD): | |
703 | break; | |
704 | default: | |
705 | return -EPROTONOSUPPORT; | |
706 | } | |
707 | } | |
708 | #endif | |
709 | ||
710 | return 0; | |
711 | } | |
712 | ||
713 | static int br_dev_newlink(struct net *src_net, struct net_device *dev, | |
714 | struct nlattr *tb[], struct nlattr *data[]) | |
715 | { | |
716 | struct net_bridge *br = netdev_priv(dev); | |
717 | ||
718 | if (tb[IFLA_ADDRESS]) { | |
719 | spin_lock_bh(&br->lock); | |
720 | br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS])); | |
721 | spin_unlock_bh(&br->lock); | |
722 | } | |
723 | ||
724 | return register_netdevice(dev); | |
725 | } | |
726 | ||
727 | static int br_port_slave_changelink(struct net_device *brdev, | |
728 | struct net_device *dev, | |
729 | struct nlattr *tb[], | |
730 | struct nlattr *data[]) | |
731 | { | |
732 | struct net_bridge *br = netdev_priv(brdev); | |
733 | int ret; | |
734 | ||
735 | if (!data) | |
736 | return 0; | |
737 | ||
738 | spin_lock_bh(&br->lock); | |
739 | ret = br_setport(br_port_get_rtnl(dev), data); | |
740 | spin_unlock_bh(&br->lock); | |
741 | ||
742 | return ret; | |
743 | } | |
744 | ||
745 | static int br_port_fill_slave_info(struct sk_buff *skb, | |
746 | const struct net_device *brdev, | |
747 | const struct net_device *dev) | |
748 | { | |
749 | return br_port_fill_attrs(skb, br_port_get_rtnl(dev)); | |
750 | } | |
751 | ||
752 | static size_t br_port_get_slave_size(const struct net_device *brdev, | |
753 | const struct net_device *dev) | |
754 | { | |
755 | return br_port_info_size(); | |
756 | } | |
757 | ||
758 | static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = { | |
759 | [IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 }, | |
760 | [IFLA_BR_HELLO_TIME] = { .type = NLA_U32 }, | |
761 | [IFLA_BR_MAX_AGE] = { .type = NLA_U32 }, | |
762 | [IFLA_BR_AGEING_TIME] = { .type = NLA_U32 }, | |
763 | [IFLA_BR_STP_STATE] = { .type = NLA_U32 }, | |
764 | [IFLA_BR_PRIORITY] = { .type = NLA_U16 }, | |
765 | [IFLA_BR_VLAN_FILTERING] = { .type = NLA_U8 }, | |
766 | [IFLA_BR_VLAN_PROTOCOL] = { .type = NLA_U16 }, | |
767 | [IFLA_BR_GROUP_FWD_MASK] = { .type = NLA_U16 }, | |
768 | }; | |
769 | ||
770 | static int br_changelink(struct net_device *brdev, struct nlattr *tb[], | |
771 | struct nlattr *data[]) | |
772 | { | |
773 | struct net_bridge *br = netdev_priv(brdev); | |
774 | int err; | |
775 | ||
776 | if (!data) | |
777 | return 0; | |
778 | ||
779 | if (data[IFLA_BR_FORWARD_DELAY]) { | |
780 | err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY])); | |
781 | if (err) | |
782 | return err; | |
783 | } | |
784 | ||
785 | if (data[IFLA_BR_HELLO_TIME]) { | |
786 | err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME])); | |
787 | if (err) | |
788 | return err; | |
789 | } | |
790 | ||
791 | if (data[IFLA_BR_MAX_AGE]) { | |
792 | err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE])); | |
793 | if (err) | |
794 | return err; | |
795 | } | |
796 | ||
797 | if (data[IFLA_BR_AGEING_TIME]) { | |
798 | u32 ageing_time = nla_get_u32(data[IFLA_BR_AGEING_TIME]); | |
799 | ||
800 | br->ageing_time = clock_t_to_jiffies(ageing_time); | |
801 | } | |
802 | ||
803 | if (data[IFLA_BR_STP_STATE]) { | |
804 | u32 stp_enabled = nla_get_u32(data[IFLA_BR_STP_STATE]); | |
805 | ||
806 | br_stp_set_enabled(br, stp_enabled); | |
807 | } | |
808 | ||
809 | if (data[IFLA_BR_PRIORITY]) { | |
810 | u32 priority = nla_get_u16(data[IFLA_BR_PRIORITY]); | |
811 | ||
812 | br_stp_set_bridge_priority(br, priority); | |
813 | } | |
814 | ||
815 | if (data[IFLA_BR_VLAN_FILTERING]) { | |
816 | u8 vlan_filter = nla_get_u8(data[IFLA_BR_VLAN_FILTERING]); | |
817 | ||
818 | err = __br_vlan_filter_toggle(br, vlan_filter); | |
819 | if (err) | |
820 | return err; | |
821 | } | |
822 | ||
823 | #ifdef CONFIG_BRIDGE_VLAN_FILTERING | |
824 | if (data[IFLA_BR_VLAN_PROTOCOL]) { | |
825 | __be16 vlan_proto = nla_get_be16(data[IFLA_BR_VLAN_PROTOCOL]); | |
826 | ||
827 | err = __br_vlan_set_proto(br, vlan_proto); | |
828 | if (err) | |
829 | return err; | |
830 | } | |
831 | #endif | |
832 | ||
833 | if (data[IFLA_BR_GROUP_FWD_MASK]) { | |
834 | u16 fwd_mask = nla_get_u16(data[IFLA_BR_GROUP_FWD_MASK]); | |
835 | ||
836 | if (fwd_mask & BR_GROUPFWD_RESTRICTED) | |
837 | return -EINVAL; | |
838 | br->group_fwd_mask = fwd_mask; | |
839 | } | |
840 | ||
841 | return 0; | |
842 | } | |
843 | ||
844 | static size_t br_get_size(const struct net_device *brdev) | |
845 | { | |
846 | return nla_total_size(sizeof(u32)) + /* IFLA_BR_FORWARD_DELAY */ | |
847 | nla_total_size(sizeof(u32)) + /* IFLA_BR_HELLO_TIME */ | |
848 | nla_total_size(sizeof(u32)) + /* IFLA_BR_MAX_AGE */ | |
849 | nla_total_size(sizeof(u32)) + /* IFLA_BR_AGEING_TIME */ | |
850 | nla_total_size(sizeof(u32)) + /* IFLA_BR_STP_STATE */ | |
851 | nla_total_size(sizeof(u16)) + /* IFLA_BR_PRIORITY */ | |
852 | nla_total_size(sizeof(u8)) + /* IFLA_BR_VLAN_FILTERING */ | |
853 | #ifdef CONFIG_BRIDGE_VLAN_FILTERING | |
854 | nla_total_size(sizeof(__be16)) + /* IFLA_BR_VLAN_PROTOCOL */ | |
855 | #endif | |
856 | nla_total_size(sizeof(u16)) + /* IFLA_BR_GROUP_FWD_MASK */ | |
857 | nla_total_size(sizeof(struct ifla_bridge_id)) + /* IFLA_BR_ROOT_ID */ | |
858 | nla_total_size(sizeof(struct ifla_bridge_id)) + /* IFLA_BR_BRIDGE_ID */ | |
859 | 0; | |
860 | } | |
861 | ||
862 | static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev) | |
863 | { | |
864 | struct net_bridge *br = netdev_priv(brdev); | |
865 | u32 forward_delay = jiffies_to_clock_t(br->forward_delay); | |
866 | u32 hello_time = jiffies_to_clock_t(br->hello_time); | |
867 | u32 age_time = jiffies_to_clock_t(br->max_age); | |
868 | u32 ageing_time = jiffies_to_clock_t(br->ageing_time); | |
869 | u32 stp_enabled = br->stp_enabled; | |
870 | u16 priority = (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]; | |
871 | u16 group_fwd_mask = br->group_fwd_mask; | |
872 | u8 vlan_enabled = br_vlan_enabled(br); | |
873 | struct ifla_bridge_id root_id, bridge_id; | |
874 | ||
875 | memset(&bridge_id, 0, sizeof(bridge_id)); | |
876 | memset(&root_id, 0, sizeof(root_id)); | |
877 | memcpy(root_id.prio, br->designated_root.prio, sizeof(root_id.prio)); | |
878 | memcpy(root_id.addr, br->designated_root.addr, sizeof(root_id.addr)); | |
879 | memcpy(bridge_id.prio, br->bridge_id.prio, sizeof(bridge_id.prio)); | |
880 | memcpy(bridge_id.addr, br->bridge_id.addr, sizeof(bridge_id.addr)); | |
881 | ||
882 | if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) || | |
883 | nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) || | |
884 | nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time) || | |
885 | nla_put_u32(skb, IFLA_BR_AGEING_TIME, ageing_time) || | |
886 | nla_put_u32(skb, IFLA_BR_STP_STATE, stp_enabled) || | |
887 | nla_put_u16(skb, IFLA_BR_PRIORITY, priority) || | |
888 | nla_put_u8(skb, IFLA_BR_VLAN_FILTERING, vlan_enabled) || | |
889 | nla_put_u16(skb, IFLA_BR_GROUP_FWD_MASK, group_fwd_mask) || | |
890 | nla_put(skb, IFLA_BR_ROOT_ID, sizeof(root_id), &root_id) || | |
891 | nla_put(skb, IFLA_BR_BRIDGE_ID, sizeof(bridge_id), &bridge_id)) | |
892 | return -EMSGSIZE; | |
893 | ||
894 | #ifdef CONFIG_BRIDGE_VLAN_FILTERING | |
895 | if (nla_put_be16(skb, IFLA_BR_VLAN_PROTOCOL, br->vlan_proto)) | |
896 | return -EMSGSIZE; | |
897 | #endif | |
898 | ||
899 | return 0; | |
900 | } | |
901 | ||
902 | static size_t br_get_link_af_size(const struct net_device *dev) | |
903 | { | |
904 | struct net_bridge_port *p; | |
905 | struct net_bridge *br; | |
906 | int num_vlans = 0; | |
907 | ||
908 | if (br_port_exists(dev)) { | |
909 | p = br_port_get_rtnl(dev); | |
910 | num_vlans = br_get_num_vlan_infos(nbp_vlan_group(p), | |
911 | RTEXT_FILTER_BRVLAN); | |
912 | } else if (dev->priv_flags & IFF_EBRIDGE) { | |
913 | br = netdev_priv(dev); | |
914 | num_vlans = br_get_num_vlan_infos(br_vlan_group(br), | |
915 | RTEXT_FILTER_BRVLAN); | |
916 | } | |
917 | ||
918 | /* Each VLAN is returned in bridge_vlan_info along with flags */ | |
919 | return num_vlans * nla_total_size(sizeof(struct bridge_vlan_info)); | |
920 | } | |
921 | ||
922 | static struct rtnl_af_ops br_af_ops __read_mostly = { | |
923 | .family = AF_BRIDGE, | |
924 | .get_link_af_size = br_get_link_af_size, | |
925 | }; | |
926 | ||
927 | struct rtnl_link_ops br_link_ops __read_mostly = { | |
928 | .kind = "bridge", | |
929 | .priv_size = sizeof(struct net_bridge), | |
930 | .setup = br_dev_setup, | |
931 | .maxtype = IFLA_BR_MAX, | |
932 | .policy = br_policy, | |
933 | .validate = br_validate, | |
934 | .newlink = br_dev_newlink, | |
935 | .changelink = br_changelink, | |
936 | .dellink = br_dev_delete, | |
937 | .get_size = br_get_size, | |
938 | .fill_info = br_fill_info, | |
939 | ||
940 | .slave_maxtype = IFLA_BRPORT_MAX, | |
941 | .slave_policy = br_port_policy, | |
942 | .slave_changelink = br_port_slave_changelink, | |
943 | .get_slave_size = br_port_get_slave_size, | |
944 | .fill_slave_info = br_port_fill_slave_info, | |
945 | }; | |
946 | ||
947 | int __init br_netlink_init(void) | |
948 | { | |
949 | int err; | |
950 | ||
951 | br_mdb_init(); | |
952 | rtnl_af_register(&br_af_ops); | |
953 | ||
954 | err = rtnl_link_register(&br_link_ops); | |
955 | if (err) | |
956 | goto out_af; | |
957 | ||
958 | return 0; | |
959 | ||
960 | out_af: | |
961 | rtnl_af_unregister(&br_af_ops); | |
962 | br_mdb_uninit(); | |
963 | return err; | |
964 | } | |
965 | ||
966 | void br_netlink_fini(void) | |
967 | { | |
968 | br_mdb_uninit(); | |
969 | rtnl_af_unregister(&br_af_ops); | |
970 | rtnl_link_unregister(&br_link_ops); | |
971 | } |