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Merge tag 'v3.10.98' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.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 <uapi/linux/if_bridge.h>
20
21 #include "br_private.h"
22 #include "br_private_stp.h"
23
24 static inline size_t br_port_info_size(void)
25 {
26 return nla_total_size(1) /* IFLA_BRPORT_STATE */
27 + nla_total_size(2) /* IFLA_BRPORT_PRIORITY */
28 + nla_total_size(4) /* IFLA_BRPORT_COST */
29 + nla_total_size(1) /* IFLA_BRPORT_MODE */
30 + nla_total_size(1) /* IFLA_BRPORT_GUARD */
31 + nla_total_size(1) /* IFLA_BRPORT_PROTECT */
32 + nla_total_size(1) /* IFLA_BRPORT_FAST_LEAVE */
33 + 0;
34 }
35
36 static inline size_t br_nlmsg_size(void)
37 {
38 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
39 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
40 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
41 + nla_total_size(4) /* IFLA_MASTER */
42 + nla_total_size(4) /* IFLA_MTU */
43 + nla_total_size(4) /* IFLA_LINK */
44 + nla_total_size(1) /* IFLA_OPERSTATE */
45 + nla_total_size(br_port_info_size()); /* IFLA_PROTINFO */
46 }
47
48 static int br_port_fill_attrs(struct sk_buff *skb,
49 const struct net_bridge_port *p)
50 {
51 u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
52
53 if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
54 nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
55 nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
56 nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
57 nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
58 nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
59 nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)))
60 return -EMSGSIZE;
61
62 return 0;
63 }
64
65 /*
66 * Create one netlink message for one interface
67 * Contains port and master info as well as carrier and bridge state.
68 */
69 static int br_fill_ifinfo(struct sk_buff *skb,
70 const struct net_bridge_port *port,
71 u32 pid, u32 seq, int event, unsigned int flags,
72 u32 filter_mask, const struct net_device *dev)
73 {
74 const struct net_bridge *br;
75 struct ifinfomsg *hdr;
76 struct nlmsghdr *nlh;
77 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
78
79 if (port)
80 br = port->br;
81 else
82 br = netdev_priv(dev);
83
84 br_debug(br, "br_fill_info event %d port %s master %s\n",
85 event, dev->name, br->dev->name);
86
87 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
88 if (nlh == NULL)
89 return -EMSGSIZE;
90
91 hdr = nlmsg_data(nlh);
92 hdr->ifi_family = AF_BRIDGE;
93 hdr->__ifi_pad = 0;
94 hdr->ifi_type = dev->type;
95 hdr->ifi_index = dev->ifindex;
96 hdr->ifi_flags = dev_get_flags(dev);
97 hdr->ifi_change = 0;
98
99 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
100 nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
101 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
102 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
103 (dev->addr_len &&
104 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
105 (dev->ifindex != dev->iflink &&
106 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
107 goto nla_put_failure;
108
109 if (event == RTM_NEWLINK && port) {
110 struct nlattr *nest
111 = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
112
113 if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
114 goto nla_put_failure;
115 nla_nest_end(skb, nest);
116 }
117
118 /* Check if the VID information is requested */
119 if (filter_mask & RTEXT_FILTER_BRVLAN) {
120 struct nlattr *af;
121 const struct net_port_vlans *pv;
122 struct bridge_vlan_info vinfo;
123 u16 vid;
124 u16 pvid;
125
126 if (port)
127 pv = nbp_get_vlan_info(port);
128 else
129 pv = br_get_vlan_info(br);
130
131 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
132 goto done;
133
134 af = nla_nest_start(skb, IFLA_AF_SPEC);
135 if (!af)
136 goto nla_put_failure;
137
138 pvid = br_get_pvid(pv);
139 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
140 vinfo.vid = vid;
141 vinfo.flags = 0;
142 if (vid == pvid)
143 vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
144
145 if (test_bit(vid, pv->untagged_bitmap))
146 vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
147
148 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
149 sizeof(vinfo), &vinfo))
150 goto nla_put_failure;
151 }
152
153 nla_nest_end(skb, af);
154 }
155
156 done:
157 return nlmsg_end(skb, nlh);
158
159 nla_put_failure:
160 nlmsg_cancel(skb, nlh);
161 return -EMSGSIZE;
162 }
163
164 /*
165 * Notify listeners of a change in port information
166 */
167 void br_ifinfo_notify(int event, struct net_bridge_port *port)
168 {
169 struct net *net;
170 struct sk_buff *skb;
171 int err = -ENOBUFS;
172
173 if (!port)
174 return;
175
176 net = dev_net(port->dev);
177 br_debug(port->br, "port %u(%s) event %d\n",
178 (unsigned int)port->port_no, port->dev->name, event);
179
180 skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
181 if (skb == NULL)
182 goto errout;
183
184 err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
185 if (err < 0) {
186 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
187 WARN_ON(err == -EMSGSIZE);
188 kfree_skb(skb);
189 goto errout;
190 }
191 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
192 return;
193 errout:
194 if (err < 0)
195 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
196 }
197
198
199 /*
200 * Dump information about all ports, in response to GETLINK
201 */
202 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
203 struct net_device *dev, u32 filter_mask)
204 {
205 int err = 0;
206 struct net_bridge_port *port = br_port_get_rtnl(dev);
207
208 /* not a bridge port and */
209 if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN))
210 goto out;
211
212 err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI,
213 filter_mask, dev);
214 out:
215 return err;
216 }
217
218 static const struct nla_policy ifla_br_policy[IFLA_MAX+1] = {
219 [IFLA_BRIDGE_FLAGS] = { .type = NLA_U16 },
220 [IFLA_BRIDGE_MODE] = { .type = NLA_U16 },
221 [IFLA_BRIDGE_VLAN_INFO] = { .type = NLA_BINARY,
222 .len = sizeof(struct bridge_vlan_info), },
223 };
224
225 static int br_afspec(struct net_bridge *br,
226 struct net_bridge_port *p,
227 struct nlattr *af_spec,
228 int cmd)
229 {
230 struct nlattr *tb[IFLA_BRIDGE_MAX+1];
231 int err = 0;
232
233 err = nla_parse_nested(tb, IFLA_BRIDGE_MAX, af_spec, ifla_br_policy);
234 if (err)
235 return err;
236
237 if (tb[IFLA_BRIDGE_VLAN_INFO]) {
238 struct bridge_vlan_info *vinfo;
239
240 vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]);
241
242 if (vinfo->vid >= VLAN_N_VID)
243 return -EINVAL;
244
245 switch (cmd) {
246 case RTM_SETLINK:
247 if (p) {
248 err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
249 if (err)
250 break;
251
252 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
253 err = br_vlan_add(p->br, vinfo->vid,
254 vinfo->flags);
255 } else
256 err = br_vlan_add(br, vinfo->vid, vinfo->flags);
257
258 if (err)
259 break;
260
261 break;
262
263 case RTM_DELLINK:
264 if (p) {
265 nbp_vlan_delete(p, vinfo->vid);
266 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
267 br_vlan_delete(p->br, vinfo->vid);
268 } else
269 br_vlan_delete(br, vinfo->vid);
270 break;
271 }
272 }
273
274 return err;
275 }
276
277 static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = {
278 [IFLA_BRPORT_STATE] = { .type = NLA_U8 },
279 [IFLA_BRPORT_COST] = { .type = NLA_U32 },
280 [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
281 [IFLA_BRPORT_MODE] = { .type = NLA_U8 },
282 [IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
283 [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
284 };
285
286 /* Change the state of the port and notify spanning tree */
287 static int br_set_port_state(struct net_bridge_port *p, u8 state)
288 {
289 if (state > BR_STATE_BLOCKING)
290 return -EINVAL;
291
292 /* if kernel STP is running, don't allow changes */
293 if (p->br->stp_enabled == BR_KERNEL_STP)
294 return -EBUSY;
295
296 /* if device is not up, change is not allowed
297 * if link is not present, only allowable state is disabled
298 */
299 if (!netif_running(p->dev) ||
300 (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
301 return -ENETDOWN;
302
303 p->state = state;
304 br_log_state(p);
305 br_port_state_selection(p->br);
306 return 0;
307 }
308
309 /* Set/clear or port flags based on attribute */
310 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
311 int attrtype, unsigned long mask)
312 {
313 if (tb[attrtype]) {
314 u8 flag = nla_get_u8(tb[attrtype]);
315 if (flag)
316 p->flags |= mask;
317 else
318 p->flags &= ~mask;
319 }
320 }
321
322 /* Process bridge protocol info on port */
323 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
324 {
325 int err;
326
327 br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
328 br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
329 br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
330 br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
331
332 if (tb[IFLA_BRPORT_COST]) {
333 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
334 if (err)
335 return err;
336 }
337
338 if (tb[IFLA_BRPORT_PRIORITY]) {
339 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
340 if (err)
341 return err;
342 }
343
344 if (tb[IFLA_BRPORT_STATE]) {
345 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
346 if (err)
347 return err;
348 }
349 return 0;
350 }
351
352 /* Change state and parameters on port. */
353 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
354 {
355 struct nlattr *protinfo;
356 struct nlattr *afspec;
357 struct net_bridge_port *p;
358 struct nlattr *tb[IFLA_BRPORT_MAX + 1];
359 int err = 0;
360
361 protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
362 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
363 if (!protinfo && !afspec)
364 return 0;
365
366 p = br_port_get_rtnl(dev);
367 /* We want to accept dev as bridge itself if the AF_SPEC
368 * is set to see if someone is setting vlan info on the brigde
369 */
370 if (!p && !afspec)
371 return -EINVAL;
372
373 if (p && protinfo) {
374 if (protinfo->nla_type & NLA_F_NESTED) {
375 err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
376 protinfo, ifla_brport_policy);
377 if (err)
378 return err;
379
380 spin_lock_bh(&p->br->lock);
381 err = br_setport(p, tb);
382 spin_unlock_bh(&p->br->lock);
383 } else {
384 /* Binary compatability with old RSTP */
385 if (nla_len(protinfo) < sizeof(u8))
386 return -EINVAL;
387
388 spin_lock_bh(&p->br->lock);
389 err = br_set_port_state(p, nla_get_u8(protinfo));
390 spin_unlock_bh(&p->br->lock);
391 }
392 if (err)
393 goto out;
394 }
395
396 if (afspec) {
397 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
398 afspec, RTM_SETLINK);
399 }
400
401 if (err == 0)
402 br_ifinfo_notify(RTM_NEWLINK, p);
403
404 out:
405 return err;
406 }
407
408 /* Delete port information */
409 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh)
410 {
411 struct nlattr *afspec;
412 struct net_bridge_port *p;
413 int err;
414
415 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
416 if (!afspec)
417 return 0;
418
419 p = br_port_get_rtnl(dev);
420 /* We want to accept dev as bridge itself as well */
421 if (!p && !(dev->priv_flags & IFF_EBRIDGE))
422 return -EINVAL;
423
424 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
425 afspec, RTM_DELLINK);
426
427 return err;
428 }
429 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
430 {
431 if (tb[IFLA_ADDRESS]) {
432 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
433 return -EINVAL;
434 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
435 return -EADDRNOTAVAIL;
436 }
437
438 return 0;
439 }
440
441 static int br_dev_newlink(struct net *src_net, struct net_device *dev,
442 struct nlattr *tb[], struct nlattr *data[])
443 {
444 struct net_bridge *br = netdev_priv(dev);
445
446 if (tb[IFLA_ADDRESS]) {
447 spin_lock_bh(&br->lock);
448 br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
449 spin_unlock_bh(&br->lock);
450 }
451
452 return register_netdevice(dev);
453 }
454
455 static size_t br_get_link_af_size(const struct net_device *dev)
456 {
457 struct net_port_vlans *pv;
458
459 if (br_port_exists(dev))
460 pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
461 else if (dev->priv_flags & IFF_EBRIDGE)
462 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
463 else
464 return 0;
465
466 if (!pv)
467 return 0;
468
469 /* Each VLAN is returned in bridge_vlan_info along with flags */
470 return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
471 }
472
473 static struct rtnl_af_ops br_af_ops = {
474 .family = AF_BRIDGE,
475 .get_link_af_size = br_get_link_af_size,
476 };
477
478 struct rtnl_link_ops br_link_ops __read_mostly = {
479 .kind = "bridge",
480 .priv_size = sizeof(struct net_bridge),
481 .setup = br_dev_setup,
482 .validate = br_validate,
483 .newlink = br_dev_newlink,
484 .dellink = br_dev_delete,
485 };
486
487 int __init br_netlink_init(void)
488 {
489 int err;
490
491 br_mdb_init();
492 err = rtnl_af_register(&br_af_ops);
493 if (err)
494 goto out;
495
496 err = rtnl_link_register(&br_link_ops);
497 if (err)
498 goto out_af;
499
500 return 0;
501
502 out_af:
503 rtnl_af_unregister(&br_af_ops);
504 out:
505 br_mdb_uninit();
506 return err;
507 }
508
509 void __exit br_netlink_fini(void)
510 {
511 br_mdb_uninit();
512 rtnl_af_unregister(&br_af_ops);
513 rtnl_link_unregister(&br_link_ops);
514 }
kernel source for telekom puls (alcatel/mediatek)