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Input: remove race when instantiating polled device attributes
[linux/fpc-iii.git] / net / bridge / br_netlink.c
blobe74b6d530cb6a3ab3dc650ee1900df06d3b3441a
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 + nla_total_size(1) /* IFLA_BRPORT_LEARNING */
34 + nla_total_size(1) /* IFLA_BRPORT_UNICAST_FLOOD */
35 + 0;
36 }
37
38 static inline size_t br_nlmsg_size(void)
39 {
40 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
41 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
42 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
43 + nla_total_size(4) /* IFLA_MASTER */
44 + nla_total_size(4) /* IFLA_MTU */
45 + nla_total_size(4) /* IFLA_LINK */
46 + nla_total_size(1) /* IFLA_OPERSTATE */
47 + nla_total_size(br_port_info_size()); /* IFLA_PROTINFO */
48 }
49
50 static int br_port_fill_attrs(struct sk_buff *skb,
51 const struct net_bridge_port *p)
52 {
53 u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
54
55 if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
56 nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
57 nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
58 nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
59 nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
60 nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
61 nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
62 nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
63 nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)))
64 return -EMSGSIZE;
65
66 return 0;
67 }
68
69 /*
70 * Create one netlink message for one interface
71 * Contains port and master info as well as carrier and bridge state.
72 */
73 static int br_fill_ifinfo(struct sk_buff *skb,
74 const struct net_bridge_port *port,
75 u32 pid, u32 seq, int event, unsigned int flags,
76 u32 filter_mask, const struct net_device *dev)
77 {
78 const struct net_bridge *br;
79 struct ifinfomsg *hdr;
80 struct nlmsghdr *nlh;
81 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
82
83 if (port)
84 br = port->br;
85 else
86 br = netdev_priv(dev);
87
88 br_debug(br, "br_fill_info event %d port %s master %s\n",
89 event, dev->name, br->dev->name);
90
91 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
92 if (nlh == NULL)
93 return -EMSGSIZE;
94
95 hdr = nlmsg_data(nlh);
96 hdr->ifi_family = AF_BRIDGE;
97 hdr->__ifi_pad = 0;
98 hdr->ifi_type = dev->type;
99 hdr->ifi_index = dev->ifindex;
100 hdr->ifi_flags = dev_get_flags(dev);
101 hdr->ifi_change = 0;
102
103 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
104 nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
105 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
106 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
107 (dev->addr_len &&
108 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
109 (dev->ifindex != dev->iflink &&
110 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
111 goto nla_put_failure;
112
113 if (event == RTM_NEWLINK && port) {
114 struct nlattr *nest
115 = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
116
117 if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
118 goto nla_put_failure;
119 nla_nest_end(skb, nest);
120 }
121
122 /* Check if the VID information is requested */
123 if (filter_mask & RTEXT_FILTER_BRVLAN) {
124 struct nlattr *af;
125 const struct net_port_vlans *pv;
126 struct bridge_vlan_info vinfo;
127 u16 vid;
128 u16 pvid;
129
130 if (port)
131 pv = nbp_get_vlan_info(port);
132 else
133 pv = br_get_vlan_info(br);
134
135 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
136 goto done;
137
138 af = nla_nest_start(skb, IFLA_AF_SPEC);
139 if (!af)
140 goto nla_put_failure;
141
142 pvid = br_get_pvid(pv);
143 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
144 vinfo.vid = vid;
145 vinfo.flags = 0;
146 if (vid == pvid)
147 vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
148
149 if (test_bit(vid, pv->untagged_bitmap))
150 vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
151
152 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
153 sizeof(vinfo), &vinfo))
154 goto nla_put_failure;
155 }
156
157 nla_nest_end(skb, af);
158 }
159
160 done:
161 return nlmsg_end(skb, nlh);
162
163 nla_put_failure:
164 nlmsg_cancel(skb, nlh);
165 return -EMSGSIZE;
166 }
167
168 /*
169 * Notify listeners of a change in port information
170 */
171 void br_ifinfo_notify(int event, struct net_bridge_port *port)
172 {
173 struct net *net;
174 struct sk_buff *skb;
175 int err = -ENOBUFS;
176
177 if (!port)
178 return;
179
180 net = dev_net(port->dev);
181 br_debug(port->br, "port %u(%s) event %d\n",
182 (unsigned int)port->port_no, port->dev->name, event);
183
184 skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
185 if (skb == NULL)
186 goto errout;
187
188 err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
189 if (err < 0) {
190 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
191 WARN_ON(err == -EMSGSIZE);
192 kfree_skb(skb);
193 goto errout;
194 }
195 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
196 return;
197 errout:
198 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
199 }
200
201
202 /*
203 * Dump information about all ports, in response to GETLINK
204 */
205 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
206 struct net_device *dev, u32 filter_mask)
207 {
208 int err = 0;
209 struct net_bridge_port *port = br_port_get_rtnl(dev);
210
211 /* not a bridge port and */
212 if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN))
213 goto out;
214
215 err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI,
216 filter_mask, dev);
217 out:
218 return err;
219 }
220
221 static const struct nla_policy ifla_br_policy[IFLA_MAX+1] = {
222 [IFLA_BRIDGE_FLAGS] = { .type = NLA_U16 },
223 [IFLA_BRIDGE_MODE] = { .type = NLA_U16 },
224 [IFLA_BRIDGE_VLAN_INFO] = { .type = NLA_BINARY,
225 .len = sizeof(struct bridge_vlan_info), },
226 };
227
228 static int br_afspec(struct net_bridge *br,
229 struct net_bridge_port *p,
230 struct nlattr *af_spec,
231 int cmd)
232 {
233 struct nlattr *tb[IFLA_BRIDGE_MAX+1];
234 int err = 0;
235
236 err = nla_parse_nested(tb, IFLA_BRIDGE_MAX, af_spec, ifla_br_policy);
237 if (err)
238 return err;
239
240 if (tb[IFLA_BRIDGE_VLAN_INFO]) {
241 struct bridge_vlan_info *vinfo;
242
243 vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]);
244
245 if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
246 return -EINVAL;
247
248 switch (cmd) {
249 case RTM_SETLINK:
250 if (p) {
251 err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
252 if (err)
253 break;
254
255 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
256 err = br_vlan_add(p->br, vinfo->vid,
257 vinfo->flags);
258 } else
259 err = br_vlan_add(br, vinfo->vid, vinfo->flags);
260
261 if (err)
262 break;
263
264 break;
265
266 case RTM_DELLINK:
267 if (p) {
268 nbp_vlan_delete(p, vinfo->vid);
269 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
270 br_vlan_delete(p->br, vinfo->vid);
271 } else
272 br_vlan_delete(br, vinfo->vid);
273 break;
274 }
275 }
276
277 return err;
278 }
279
280 static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = {
281 [IFLA_BRPORT_STATE] = { .type = NLA_U8 },
282 [IFLA_BRPORT_COST] = { .type = NLA_U32 },
283 [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
284 [IFLA_BRPORT_MODE] = { .type = NLA_U8 },
285 [IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
286 [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
287 [IFLA_BRPORT_LEARNING] = { .type = NLA_U8 },
288 [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
289 };
290
291 /* Change the state of the port and notify spanning tree */
292 static int br_set_port_state(struct net_bridge_port *p, u8 state)
293 {
294 if (state > BR_STATE_BLOCKING)
295 return -EINVAL;
296
297 /* if kernel STP is running, don't allow changes */
298 if (p->br->stp_enabled == BR_KERNEL_STP)
299 return -EBUSY;
300
301 /* if device is not up, change is not allowed
302 * if link is not present, only allowable state is disabled
303 */
304 if (!netif_running(p->dev) ||
305 (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
306 return -ENETDOWN;
307
308 p->state = state;
309 br_log_state(p);
310 br_port_state_selection(p->br);
311 return 0;
312 }
313
314 /* Set/clear or port flags based on attribute */
315 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
316 int attrtype, unsigned long mask)
317 {
318 if (tb[attrtype]) {
319 u8 flag = nla_get_u8(tb[attrtype]);
320 if (flag)
321 p->flags |= mask;
322 else
323 p->flags &= ~mask;
324 }
325 }
326
327 /* Process bridge protocol info on port */
328 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
329 {
330 int err;
331
332 br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
333 br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
334 br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
335 br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
336 br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
337 br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
338
339 if (tb[IFLA_BRPORT_COST]) {
340 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
341 if (err)
342 return err;
343 }
344
345 if (tb[IFLA_BRPORT_PRIORITY]) {
346 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
347 if (err)
348 return err;
349 }
350
351 if (tb[IFLA_BRPORT_STATE]) {
352 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
353 if (err)
354 return err;
355 }
356 return 0;
357 }
358
359 /* Change state and parameters on port. */
360 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
361 {
362 struct nlattr *protinfo;
363 struct nlattr *afspec;
364 struct net_bridge_port *p;
365 struct nlattr *tb[IFLA_BRPORT_MAX + 1];
366 int err = 0;
367
368 protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
369 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
370 if (!protinfo && !afspec)
371 return 0;
372
373 p = br_port_get_rtnl(dev);
374 /* We want to accept dev as bridge itself if the AF_SPEC
375 * is set to see if someone is setting vlan info on the bridge
376 */
377 if (!p && !afspec)
378 return -EINVAL;
379
380 if (p && protinfo) {
381 if (protinfo->nla_type & NLA_F_NESTED) {
382 err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
383 protinfo, ifla_brport_policy);
384 if (err)
385 return err;
386
387 spin_lock_bh(&p->br->lock);
388 err = br_setport(p, tb);
389 spin_unlock_bh(&p->br->lock);
390 } else {
391 /* Binary compatibility with old RSTP */
392 if (nla_len(protinfo) < sizeof(u8))
393 return -EINVAL;
394
395 spin_lock_bh(&p->br->lock);
396 err = br_set_port_state(p, nla_get_u8(protinfo));
397 spin_unlock_bh(&p->br->lock);
398 }
399 if (err)
400 goto out;
401 }
402
403 if (afspec) {
404 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
405 afspec, RTM_SETLINK);
406 }
407
408 if (err == 0)
409 br_ifinfo_notify(RTM_NEWLINK, p);
410
411 out:
412 return err;
413 }
414
415 /* Delete port information */
416 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh)
417 {
418 struct nlattr *afspec;
419 struct net_bridge_port *p;
420 int err;
421
422 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
423 if (!afspec)
424 return 0;
425
426 p = br_port_get_rtnl(dev);
427 /* We want to accept dev as bridge itself as well */
428 if (!p && !(dev->priv_flags & IFF_EBRIDGE))
429 return -EINVAL;
430
431 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
432 afspec, RTM_DELLINK);
433
434 return err;
435 }
436 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
437 {
438 if (tb[IFLA_ADDRESS]) {
439 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
440 return -EINVAL;
441 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
442 return -EADDRNOTAVAIL;
443 }
444
445 return 0;
446 }
447
448 static size_t br_get_link_af_size(const struct net_device *dev)
449 {
450 struct net_port_vlans *pv;
451
452 if (br_port_exists(dev))
453 pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
454 else if (dev->priv_flags & IFF_EBRIDGE)
455 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
456 else
457 return 0;
458
459 if (!pv)
460 return 0;
461
462 /* Each VLAN is returned in bridge_vlan_info along with flags */
463 return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
464 }
465
466 static struct rtnl_af_ops br_af_ops = {
467 .family = AF_BRIDGE,
468 .get_link_af_size = br_get_link_af_size,
469 };
470
471 struct rtnl_link_ops br_link_ops __read_mostly = {
472 .kind = "bridge",
473 .priv_size = sizeof(struct net_bridge),
474 .setup = br_dev_setup,
475 .validate = br_validate,
476 .dellink = br_dev_delete,
477 };
478
479 int __init br_netlink_init(void)
480 {
481 int err;
482
483 br_mdb_init();
484 rtnl_af_register(&br_af_ops);
485
486 err = rtnl_link_register(&br_link_ops);
487 if (err)
488 goto out_af;
489
490 return 0;
491
492 out_af:
493 rtnl_af_unregister(&br_af_ops);
494 br_mdb_uninit();
495 return err;
496 }
497
498 void __exit br_netlink_fini(void)
499 {
500 br_mdb_uninit();
501 rtnl_af_unregister(&br_af_ops);
502 rtnl_link_unregister(&br_link_ops);
503 }
Linux with added FPC-III support