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radeon: Attempt to use platform-provided ROM image
[linux/fpc-iii.git] / net / bridge / br_netlink.c
blob299fc5f40a26c12ef39786d8bc3885c0c96ca7be
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, BR_VLAN_BITMAP_LEN))
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 (vid = find_first_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN);
140 vid < BR_VLAN_BITMAP_LEN;
141 vid = find_next_bit(pv->vlan_bitmap,
142 BR_VLAN_BITMAP_LEN, vid+1)) {
143 vinfo.vid = vid;
144 vinfo.flags = 0;
145 if (vid == pvid)
146 vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
147
148 if (test_bit(vid, pv->untagged_bitmap))
149 vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
150
151 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
152 sizeof(vinfo), &vinfo))
153 goto nla_put_failure;
154 }
155
156 nla_nest_end(skb, af);
157 }
158
159 done:
160 return nlmsg_end(skb, nlh);
161
162 nla_put_failure:
163 nlmsg_cancel(skb, nlh);
164 return -EMSGSIZE;
165 }
166
167 /*
168 * Notify listeners of a change in port information
169 */
170 void br_ifinfo_notify(int event, struct net_bridge_port *port)
171 {
172 struct net *net;
173 struct sk_buff *skb;
174 int err = -ENOBUFS;
175
176 if (!port)
177 return;
178
179 net = dev_net(port->dev);
180 br_debug(port->br, "port %u(%s) event %d\n",
181 (unsigned int)port->port_no, port->dev->name, event);
182
183 skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
184 if (skb == NULL)
185 goto errout;
186
187 err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
188 if (err < 0) {
189 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
190 WARN_ON(err == -EMSGSIZE);
191 kfree_skb(skb);
192 goto errout;
193 }
194 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
195 return;
196 errout:
197 if (err < 0)
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_rcu(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 >= VLAN_N_VID)
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 };
288
289 /* Change the state of the port and notify spanning tree */
290 static int br_set_port_state(struct net_bridge_port *p, u8 state)
291 {
292 if (state > BR_STATE_BLOCKING)
293 return -EINVAL;
294
295 /* if kernel STP is running, don't allow changes */
296 if (p->br->stp_enabled == BR_KERNEL_STP)
297 return -EBUSY;
298
299 /* if device is not up, change is not allowed
300 * if link is not present, only allowable state is disabled
301 */
302 if (!netif_running(p->dev) ||
303 (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
304 return -ENETDOWN;
305
306 p->state = state;
307 br_log_state(p);
308 br_port_state_selection(p->br);
309 return 0;
310 }
311
312 /* Set/clear or port flags based on attribute */
313 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
314 int attrtype, unsigned long mask)
315 {
316 if (tb[attrtype]) {
317 u8 flag = nla_get_u8(tb[attrtype]);
318 if (flag)
319 p->flags |= mask;
320 else
321 p->flags &= ~mask;
322 }
323 }
324
325 /* Process bridge protocol info on port */
326 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
327 {
328 int err;
329
330 br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
331 br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
332 br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
333 br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
334
335 if (tb[IFLA_BRPORT_COST]) {
336 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
337 if (err)
338 return err;
339 }
340
341 if (tb[IFLA_BRPORT_PRIORITY]) {
342 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
343 if (err)
344 return err;
345 }
346
347 if (tb[IFLA_BRPORT_STATE]) {
348 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
349 if (err)
350 return err;
351 }
352 return 0;
353 }
354
355 /* Change state and parameters on port. */
356 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
357 {
358 struct ifinfomsg *ifm;
359 struct nlattr *protinfo;
360 struct nlattr *afspec;
361 struct net_bridge_port *p;
362 struct nlattr *tb[IFLA_BRPORT_MAX + 1];
363 int err;
364
365 ifm = nlmsg_data(nlh);
366
367 protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO);
368 afspec = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_AF_SPEC);
369 if (!protinfo && !afspec)
370 return 0;
371
372 p = br_port_get_rtnl(dev);
373 /* We want to accept dev as bridge itself if the AF_SPEC
374 * is set to see if someone is setting vlan info on the brigde
375 */
376 if (!p && ((dev->priv_flags & IFF_EBRIDGE) && !afspec))
377 return -EINVAL;
378
379 if (p && protinfo) {
380 if (protinfo->nla_type & NLA_F_NESTED) {
381 err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
382 protinfo, ifla_brport_policy);
383 if (err)
384 return err;
385
386 spin_lock_bh(&p->br->lock);
387 err = br_setport(p, tb);
388 spin_unlock_bh(&p->br->lock);
389 } else {
390 /* Binary compatability with old RSTP */
391 if (nla_len(protinfo) < sizeof(u8))
392 return -EINVAL;
393
394 spin_lock_bh(&p->br->lock);
395 err = br_set_port_state(p, nla_get_u8(protinfo));
396 spin_unlock_bh(&p->br->lock);
397 }
398 if (err)
399 goto out;
400 }
401
402 if (afspec) {
403 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
404 afspec, RTM_SETLINK);
405 }
406
407 if (err == 0)
408 br_ifinfo_notify(RTM_NEWLINK, p);
409
410 out:
411 return err;
412 }
413
414 /* Delete port information */
415 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh)
416 {
417 struct ifinfomsg *ifm;
418 struct nlattr *afspec;
419 struct net_bridge_port *p;
420 int err;
421
422 ifm = nlmsg_data(nlh);
423
424 afspec = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_AF_SPEC);
425 if (!afspec)
426 return 0;
427
428 p = br_port_get_rtnl(dev);
429 /* We want to accept dev as bridge itself as well */
430 if (!p && !(dev->priv_flags & IFF_EBRIDGE))
431 return -EINVAL;
432
433 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
434 afspec, RTM_DELLINK);
435
436 return err;
437 }
438 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
439 {
440 if (tb[IFLA_ADDRESS]) {
441 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
442 return -EINVAL;
443 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
444 return -EADDRNOTAVAIL;
445 }
446
447 return 0;
448 }
449
450 static size_t br_get_link_af_size(const struct net_device *dev)
451 {
452 struct net_port_vlans *pv;
453
454 if (br_port_exists(dev))
455 pv = nbp_get_vlan_info(br_port_get_rcu(dev));
456 else if (dev->priv_flags & IFF_EBRIDGE)
457 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
458 else
459 return 0;
460
461 if (!pv)
462 return 0;
463
464 /* Each VLAN is returned in bridge_vlan_info along with flags */
465 return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
466 }
467
468 static struct rtnl_af_ops br_af_ops = {
469 .family = AF_BRIDGE,
470 .get_link_af_size = br_get_link_af_size,
471 };
472
473 struct rtnl_link_ops br_link_ops __read_mostly = {
474 .kind = "bridge",
475 .priv_size = sizeof(struct net_bridge),
476 .setup = br_dev_setup,
477 .validate = br_validate,
478 .dellink = br_dev_delete,
479 };
480
481 int __init br_netlink_init(void)
482 {
483 int err;
484
485 br_mdb_init();
486 err = rtnl_af_register(&br_af_ops);
487 if (err)
488 goto out;
489
490 err = rtnl_link_register(&br_link_ops);
491 if (err)
492 goto out_af;
493
494 return 0;
495
496 out_af:
497 rtnl_af_unregister(&br_af_ops);
498 out:
499 br_mdb_uninit();
500 return err;
501 }
502
503 void __exit br_netlink_fini(void)
504 {
505 br_mdb_uninit();
506 rtnl_af_unregister(&br_af_ops);
507 rtnl_link_unregister(&br_link_ops);
508 }
Linux with added FPC-III support