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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
24static inline size_t br_port_info_size(void)
25{
26 return nla_total_size(1)
27 + nla_total_size(2)
28 + nla_total_size(4)
29 + nla_total_size(1)
30 + nla_total_size(1)
31 + nla_total_size(1)
32 + nla_total_size(1)
33 + nla_total_size(1)
34 + nla_total_size(1)
35 + 0;
36}
37
38static inline size_t br_nlmsg_size(void)
39{
40 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
41 + nla_total_size(IFNAMSIZ)
42 + nla_total_size(MAX_ADDR_LEN)
43 + nla_total_size(4)
44 + nla_total_size(4)
45 + nla_total_size(4)
46 + nla_total_size(1)
47 + nla_total_size(br_port_info_size());
48}
49
50static 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
71
72
73static 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
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
160done:
161 return nlmsg_end(skb, nlh);
162
163nla_put_failure:
164 nlmsg_cancel(skb, nlh);
165 return -EMSGSIZE;
166}
167
168
169
170
171void 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
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;
197errout:
198 if (err < 0)
199 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
200}
201
202
203
204
205
206int 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_rcu(dev);
211
212
213 if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN))
214 goto out;
215
216 err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI,
217 filter_mask, dev);
218out:
219 return err;
220}
221
222static const struct nla_policy ifla_br_policy[IFLA_MAX+1] = {
223 [IFLA_BRIDGE_FLAGS] = { .type = NLA_U16 },
224 [IFLA_BRIDGE_MODE] = { .type = NLA_U16 },
225 [IFLA_BRIDGE_VLAN_INFO] = { .type = NLA_BINARY,
226 .len = sizeof(struct bridge_vlan_info), },
227};
228
229static int br_afspec(struct net_bridge *br,
230 struct net_bridge_port *p,
231 struct nlattr *af_spec,
232 int cmd)
233{
234 struct nlattr *tb[IFLA_BRIDGE_MAX+1];
235 int err = 0;
236
237 err = nla_parse_nested(tb, IFLA_BRIDGE_MAX, af_spec, ifla_br_policy);
238 if (err)
239 return err;
240
241 if (tb[IFLA_BRIDGE_VLAN_INFO]) {
242 struct bridge_vlan_info *vinfo;
243
244 vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]);
245
246 if (vinfo->vid >= VLAN_N_VID)
247 return -EINVAL;
248
249 switch (cmd) {
250 case RTM_SETLINK:
251 if (p) {
252 err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
253 if (err)
254 break;
255
256 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
257 err = br_vlan_add(p->br, vinfo->vid,
258 vinfo->flags);
259 } else
260 err = br_vlan_add(br, vinfo->vid, vinfo->flags);
261
262 if (err)
263 break;
264
265 break;
266
267 case RTM_DELLINK:
268 if (p) {
269 nbp_vlan_delete(p, vinfo->vid);
270 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
271 br_vlan_delete(p->br, vinfo->vid);
272 } else
273 br_vlan_delete(br, vinfo->vid);
274 break;
275 }
276 }
277
278 return err;
279}
280
281static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = {
282 [IFLA_BRPORT_STATE] = { .type = NLA_U8 },
283 [IFLA_BRPORT_COST] = { .type = NLA_U32 },
284 [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
285 [IFLA_BRPORT_MODE] = { .type = NLA_U8 },
286 [IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
287 [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
288 [IFLA_BRPORT_LEARNING] = { .type = NLA_U8 },
289 [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
290};
291
292
293static int br_set_port_state(struct net_bridge_port *p, u8 state)
294{
295 if (state > BR_STATE_BLOCKING)
296 return -EINVAL;
297
298
299 if (p->br->stp_enabled == BR_KERNEL_STP)
300 return -EBUSY;
301
302
303
304
305 if (!netif_running(p->dev) ||
306 (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
307 return -ENETDOWN;
308
309 p->state = state;
310 br_log_state(p);
311 br_port_state_selection(p->br);
312 return 0;
313}
314
315
316static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
317 int attrtype, unsigned long mask)
318{
319 if (tb[attrtype]) {
320 u8 flag = nla_get_u8(tb[attrtype]);
321 if (flag)
322 p->flags |= mask;
323 else
324 p->flags &= ~mask;
325 }
326}
327
328
329static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
330{
331 int err;
332
333 br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
334 br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
335 br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
336 br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
337 br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
338 br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
339
340 if (tb[IFLA_BRPORT_COST]) {
341 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
342 if (err)
343 return err;
344 }
345
346 if (tb[IFLA_BRPORT_PRIORITY]) {
347 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
348 if (err)
349 return err;
350 }
351
352 if (tb[IFLA_BRPORT_STATE]) {
353 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
354 if (err)
355 return err;
356 }
357 return 0;
358}
359
360
361int 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
376
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, ifla_brport_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
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
412out:
413 return err;
414}
415
416
417int 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
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}
437static 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
449static size_t br_get_link_af_size(const struct net_device *dev)
450{
451 struct net_port_vlans *pv;
452
453 if (br_port_exists(dev))
454 pv = nbp_get_vlan_info(br_port_get_rcu(dev));
455 else if (dev->priv_flags & IFF_EBRIDGE)
456 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
457 else
458 return 0;
459
460 if (!pv)
461 return 0;
462
463
464 return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
465}
466
467static struct rtnl_af_ops br_af_ops = {
468 .family = AF_BRIDGE,
469 .get_link_af_size = br_get_link_af_size,
470};
471
472struct rtnl_link_ops br_link_ops __read_mostly = {
473 .kind = "bridge",
474 .priv_size = sizeof(struct net_bridge),
475 .setup = br_dev_setup,
476 .validate = br_validate,
477 .dellink = br_dev_delete,
478};
479
480int __init br_netlink_init(void)
481{
482 int err;
483
484 br_mdb_init();
485 err = rtnl_af_register(&br_af_ops);
486 if (err)
487 goto out;
488
489 err = rtnl_link_register(&br_link_ops);
490 if (err)
491 goto out_af;
492
493 return 0;
494
495out_af:
496 rtnl_af_unregister(&br_af_ops);
497out:
498 br_mdb_uninit();
499 return err;
500}
501
502void __exit br_netlink_fini(void)
503{
504 br_mdb_uninit();
505 rtnl_af_unregister(&br_af_ops);
506 rtnl_link_unregister(&br_link_ops);
507}
508
