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samples: bpf: add a verifier test and summary line
[linux-2.6/btrfs-unstable.git] / net / bridge / br_netlink.c
blob86c239b06f6e136f571ca0e74ccf3f9065ed095a
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 nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)))
65 return -EMSGSIZE;
66
67 return 0;
68 }
69
70 /*
71 * Create one netlink message for one interface
72 * Contains port and master info as well as carrier and bridge state.
73 */
74 static int br_fill_ifinfo(struct sk_buff *skb,
75 const struct net_bridge_port *port,
76 u32 pid, u32 seq, int event, unsigned int flags,
77 u32 filter_mask, const struct net_device *dev)
78 {
79 const struct net_bridge *br;
80 struct ifinfomsg *hdr;
81 struct nlmsghdr *nlh;
82 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
83
84 if (port)
85 br = port->br;
86 else
87 br = netdev_priv(dev);
88
89 br_debug(br, "br_fill_info event %d port %s master %s\n",
90 event, dev->name, br->dev->name);
91
92 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
93 if (nlh == NULL)
94 return -EMSGSIZE;
95
96 hdr = nlmsg_data(nlh);
97 hdr->ifi_family = AF_BRIDGE;
98 hdr->__ifi_pad = 0;
99 hdr->ifi_type = dev->type;
100 hdr->ifi_index = dev->ifindex;
101 hdr->ifi_flags = dev_get_flags(dev);
102 hdr->ifi_change = 0;
103
104 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
105 nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
106 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
107 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
108 (dev->addr_len &&
109 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
110 (dev->ifindex != dev->iflink &&
111 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
112 goto nla_put_failure;
113
114 if (event == RTM_NEWLINK && port) {
115 struct nlattr *nest
116 = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
117
118 if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
119 goto nla_put_failure;
120 nla_nest_end(skb, nest);
121 }
122
123 /* Check if the VID information is requested */
124 if (filter_mask & RTEXT_FILTER_BRVLAN) {
125 struct nlattr *af;
126 const struct net_port_vlans *pv;
127 struct bridge_vlan_info vinfo;
128 u16 vid;
129 u16 pvid;
130
131 if (port)
132 pv = nbp_get_vlan_info(port);
133 else
134 pv = br_get_vlan_info(br);
135
136 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
137 goto done;
138
139 af = nla_nest_start(skb, IFLA_AF_SPEC);
140 if (!af)
141 goto nla_put_failure;
142
143 pvid = br_get_pvid(pv);
144 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
145 vinfo.vid = vid;
146 vinfo.flags = 0;
147 if (vid == pvid)
148 vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
149
150 if (test_bit(vid, pv->untagged_bitmap))
151 vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
152
153 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
154 sizeof(vinfo), &vinfo))
155 goto nla_put_failure;
156 }
157
158 nla_nest_end(skb, af);
159 }
160
161 done:
162 return nlmsg_end(skb, nlh);
163
164 nla_put_failure:
165 nlmsg_cancel(skb, nlh);
166 return -EMSGSIZE;
167 }
168
169 /*
170 * Notify listeners of a change in port information
171 */
172 void br_ifinfo_notify(int event, struct net_bridge_port *port)
173 {
174 struct net *net;
175 struct sk_buff *skb;
176 int err = -ENOBUFS;
177
178 if (!port)
179 return;
180
181 net = dev_net(port->dev);
182 br_debug(port->br, "port %u(%s) event %d\n",
183 (unsigned int)port->port_no, port->dev->name, event);
184
185 skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
186 if (skb == NULL)
187 goto errout;
188
189 err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
190 if (err < 0) {
191 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
192 WARN_ON(err == -EMSGSIZE);
193 kfree_skb(skb);
194 goto errout;
195 }
196 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
197 return;
198 errout:
199 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
200 }
201
202
203 /*
204 * Dump information about all ports, in response to GETLINK
205 */
206 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
207 struct net_device *dev, u32 filter_mask)
208 {
209 int err = 0;
210 struct net_bridge_port *port = br_port_get_rtnl(dev);
211
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 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 br_port_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 [IFLA_BRPORT_LEARNING] = { .type = NLA_U8 },
285 [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
286 };
287
288 /* Change the state of the port and notify spanning tree */
289 static int br_set_port_state(struct net_bridge_port *p, u8 state)
290 {
291 if (state > BR_STATE_BLOCKING)
292 return -EINVAL;
293
294 /* if kernel STP is running, don't allow changes */
295 if (p->br->stp_enabled == BR_KERNEL_STP)
296 return -EBUSY;
297
298 /* if device is not up, change is not allowed
299 * if link is not present, only allowable state is disabled
300 */
301 if (!netif_running(p->dev) ||
302 (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
303 return -ENETDOWN;
304
305 br_set_state(p, state);
306 br_log_state(p);
307 br_port_state_selection(p->br);
308 return 0;
309 }
310
311 /* Set/clear or port flags based on attribute */
312 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
313 int attrtype, unsigned long mask)
314 {
315 if (tb[attrtype]) {
316 u8 flag = nla_get_u8(tb[attrtype]);
317 if (flag)
318 p->flags |= mask;
319 else
320 p->flags &= ~mask;
321 }
322 }
323
324 /* Process bridge protocol info on port */
325 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
326 {
327 int err;
328 unsigned long old_flags = p->flags;
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 br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
335 br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
336 br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
337
338 if (tb[IFLA_BRPORT_COST]) {
339 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
340 if (err)
341 return err;
342 }
343
344 if (tb[IFLA_BRPORT_PRIORITY]) {
345 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
346 if (err)
347 return err;
348 }
349
350 if (tb[IFLA_BRPORT_STATE]) {
351 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
352 if (err)
353 return err;
354 }
355
356 br_port_flags_change(p, old_flags ^ p->flags);
357 return 0;
358 }
359
360 /* Change state and parameters on port. */
361 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
362 {
363 struct nlattr *protinfo;
364 struct nlattr *afspec;
365 struct net_bridge_port *p;
366 struct nlattr *tb[IFLA_BRPORT_MAX + 1];
367 int err = 0;
368
369 protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
370 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
371 if (!protinfo && !afspec)
372 return 0;
373
374 p = br_port_get_rtnl(dev);
375 /* We want to accept dev as bridge itself if the AF_SPEC
376 * is set to see if someone is setting vlan info on the bridge
377 */
378 if (!p && !afspec)
379 return -EINVAL;
380
381 if (p && protinfo) {
382 if (protinfo->nla_type & NLA_F_NESTED) {
383 err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
384 protinfo, br_port_policy);
385 if (err)
386 return err;
387
388 spin_lock_bh(&p->br->lock);
389 err = br_setport(p, tb);
390 spin_unlock_bh(&p->br->lock);
391 } else {
392 /* Binary compatibility with old RSTP */
393 if (nla_len(protinfo) < sizeof(u8))
394 return -EINVAL;
395
396 spin_lock_bh(&p->br->lock);
397 err = br_set_port_state(p, nla_get_u8(protinfo));
398 spin_unlock_bh(&p->br->lock);
399 }
400 if (err)
401 goto out;
402 }
403
404 if (afspec) {
405 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
406 afspec, RTM_SETLINK);
407 }
408
409 if (err == 0)
410 br_ifinfo_notify(RTM_NEWLINK, p);
411
412 out:
413 return err;
414 }
415
416 /* Delete port information */
417 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh)
418 {
419 struct nlattr *afspec;
420 struct net_bridge_port *p;
421 int err;
422
423 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
424 if (!afspec)
425 return 0;
426
427 p = br_port_get_rtnl(dev);
428 /* We want to accept dev as bridge itself as well */
429 if (!p && !(dev->priv_flags & IFF_EBRIDGE))
430 return -EINVAL;
431
432 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
433 afspec, RTM_DELLINK);
434
435 return err;
436 }
437 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
438 {
439 if (tb[IFLA_ADDRESS]) {
440 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
441 return -EINVAL;
442 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
443 return -EADDRNOTAVAIL;
444 }
445
446 return 0;
447 }
448
449 static int br_dev_newlink(struct net *src_net, struct net_device *dev,
450 struct nlattr *tb[], struct nlattr *data[])
451 {
452 struct net_bridge *br = netdev_priv(dev);
453
454 if (tb[IFLA_ADDRESS]) {
455 spin_lock_bh(&br->lock);
456 br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
457 spin_unlock_bh(&br->lock);
458 }
459
460 return register_netdevice(dev);
461 }
462
463 static int br_port_slave_changelink(struct net_device *brdev,
464 struct net_device *dev,
465 struct nlattr *tb[],
466 struct nlattr *data[])
467 {
468 if (!data)
469 return 0;
470 return br_setport(br_port_get_rtnl(dev), data);
471 }
472
473 static int br_port_fill_slave_info(struct sk_buff *skb,
474 const struct net_device *brdev,
475 const struct net_device *dev)
476 {
477 return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
478 }
479
480 static size_t br_port_get_slave_size(const struct net_device *brdev,
481 const struct net_device *dev)
482 {
483 return br_port_info_size();
484 }
485
486 static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
487 [IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 },
488 [IFLA_BR_HELLO_TIME] = { .type = NLA_U32 },
489 [IFLA_BR_MAX_AGE] = { .type = NLA_U32 },
490 };
491
492 static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
493 struct nlattr *data[])
494 {
495 struct net_bridge *br = netdev_priv(brdev);
496 int err;
497
498 if (!data)
499 return 0;
500
501 if (data[IFLA_BR_FORWARD_DELAY]) {
502 err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
503 if (err)
504 return err;
505 }
506
507 if (data[IFLA_BR_HELLO_TIME]) {
508 err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
509 if (err)
510 return err;
511 }
512
513 if (data[IFLA_BR_MAX_AGE]) {
514 err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
515 if (err)
516 return err;
517 }
518
519 return 0;
520 }
521
522 static size_t br_get_size(const struct net_device *brdev)
523 {
524 return nla_total_size(sizeof(u32)) + /* IFLA_BR_FORWARD_DELAY */
525 nla_total_size(sizeof(u32)) + /* IFLA_BR_HELLO_TIME */
526 nla_total_size(sizeof(u32)) + /* IFLA_BR_MAX_AGE */
527 0;
528 }
529
530 static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
531 {
532 struct net_bridge *br = netdev_priv(brdev);
533 u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
534 u32 hello_time = jiffies_to_clock_t(br->hello_time);
535 u32 age_time = jiffies_to_clock_t(br->max_age);
536
537 if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) ||
538 nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) ||
539 nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time))
540 return -EMSGSIZE;
541
542 return 0;
543 }
544
545 static size_t br_get_link_af_size(const struct net_device *dev)
546 {
547 struct net_port_vlans *pv;
548
549 if (br_port_exists(dev))
550 pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
551 else if (dev->priv_flags & IFF_EBRIDGE)
552 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
553 else
554 return 0;
555
556 if (!pv)
557 return 0;
558
559 /* Each VLAN is returned in bridge_vlan_info along with flags */
560 return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
561 }
562
563 static struct rtnl_af_ops br_af_ops = {
564 .family = AF_BRIDGE,
565 .get_link_af_size = br_get_link_af_size,
566 };
567
568 struct rtnl_link_ops br_link_ops __read_mostly = {
569 .kind = "bridge",
570 .priv_size = sizeof(struct net_bridge),
571 .setup = br_dev_setup,
572 .maxtype = IFLA_BRPORT_MAX,
573 .policy = br_policy,
574 .validate = br_validate,
575 .newlink = br_dev_newlink,
576 .changelink = br_changelink,
577 .dellink = br_dev_delete,
578 .get_size = br_get_size,
579 .fill_info = br_fill_info,
580
581 .slave_maxtype = IFLA_BRPORT_MAX,
582 .slave_policy = br_port_policy,
583 .slave_changelink = br_port_slave_changelink,
584 .get_slave_size = br_port_get_slave_size,
585 .fill_slave_info = br_port_fill_slave_info,
586 };
587
588 int __init br_netlink_init(void)
589 {
590 int err;
591
592 br_mdb_init();
593 rtnl_af_register(&br_af_ops);
594
595 err = rtnl_link_register(&br_link_ops);
596 if (err)
597 goto out_af;
598
599 return 0;
600
601 out_af:
602 rtnl_af_unregister(&br_af_ops);
603 br_mdb_uninit();
604 return err;
605 }
606
607 void br_netlink_fini(void)
608 {
609 br_mdb_uninit();
610 rtnl_af_unregister(&br_af_ops);
611 rtnl_link_unregister(&br_link_ops);
612 }
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