2 * Bridge netlink control interface
5 * Stephen Hemminger <shemminger@osdl.org>
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.
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>
19 #include <uapi/linux/if_bridge.h>
21 #include "br_private.h"
22 #include "br_private_stp.h"
24 static inline size_t br_port_info_size(void)
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 */
36 static inline size_t br_nlmsg_size(void)
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 */
48 static int br_port_fill_attrs(struct sk_buff
*skb
,
49 const struct net_bridge_port
*p
)
51 u8 mode
= !!(p
->flags
& BR_HAIRPIN_MODE
);
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
)))
66 * Create one netlink message for one interface
67 * Contains port and master info as well as carrier and bridge state.
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
)
74 const struct net_bridge
*br
;
75 struct ifinfomsg
*hdr
;
77 u8 operstate
= netif_running(dev
) ? dev
->operstate
: IF_OPER_DOWN
;
82 br
= netdev_priv(dev
);
84 br_debug(br
, "br_fill_info event %d port %s master %s\n",
85 event
, dev
->name
, br
->dev
->name
);
87 nlh
= nlmsg_put(skb
, pid
, seq
, event
, sizeof(*hdr
), flags
);
91 hdr
= nlmsg_data(nlh
);
92 hdr
->ifi_family
= AF_BRIDGE
;
94 hdr
->ifi_type
= dev
->type
;
95 hdr
->ifi_index
= dev
->ifindex
;
96 hdr
->ifi_flags
= dev_get_flags(dev
);
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
) ||
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
;
109 if (event
== RTM_NEWLINK
&& port
) {
111 = nla_nest_start(skb
, IFLA_PROTINFO
| NLA_F_NESTED
);
113 if (nest
== NULL
|| br_port_fill_attrs(skb
, port
) < 0)
114 goto nla_put_failure
;
115 nla_nest_end(skb
, nest
);
118 /* Check if the VID information is requested */
119 if (filter_mask
& RTEXT_FILTER_BRVLAN
) {
121 const struct net_port_vlans
*pv
;
122 struct bridge_vlan_info vinfo
;
127 pv
= nbp_get_vlan_info(port
);
129 pv
= br_get_vlan_info(br
);
131 if (!pv
|| bitmap_empty(pv
->vlan_bitmap
, BR_VLAN_BITMAP_LEN
))
134 af
= nla_nest_start(skb
, IFLA_AF_SPEC
);
136 goto nla_put_failure
;
138 pvid
= br_get_pvid(pv
);
139 for_each_set_bit(vid
, pv
->vlan_bitmap
, BR_VLAN_BITMAP_LEN
) {
143 vinfo
.flags
|= BRIDGE_VLAN_INFO_PVID
;
145 if (test_bit(vid
, pv
->untagged_bitmap
))
146 vinfo
.flags
|= BRIDGE_VLAN_INFO_UNTAGGED
;
148 if (nla_put(skb
, IFLA_BRIDGE_VLAN_INFO
,
149 sizeof(vinfo
), &vinfo
))
150 goto nla_put_failure
;
153 nla_nest_end(skb
, af
);
157 return nlmsg_end(skb
, nlh
);
160 nlmsg_cancel(skb
, nlh
);
165 * Notify listeners of a change in port information
167 void br_ifinfo_notify(int event
, struct net_bridge_port
*port
)
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
);
180 skb
= nlmsg_new(br_nlmsg_size(), GFP_ATOMIC
);
184 err
= br_fill_ifinfo(skb
, port
, 0, 0, event
, 0, 0, port
->dev
);
186 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
187 WARN_ON(err
== -EMSGSIZE
);
191 rtnl_notify(skb
, net
, 0, RTNLGRP_LINK
, NULL
, GFP_ATOMIC
);
195 rtnl_set_sk_err(net
, RTNLGRP_LINK
, err
);
200 * Dump information about all ports, in response to GETLINK
202 int br_getlink(struct sk_buff
*skb
, u32 pid
, u32 seq
,
203 struct net_device
*dev
, u32 filter_mask
)
206 struct net_bridge_port
*port
= br_port_get_rcu(dev
);
208 /* not a bridge port and */
209 if (!port
&& !(filter_mask
& RTEXT_FILTER_BRVLAN
))
212 err
= br_fill_ifinfo(skb
, port
, pid
, seq
, RTM_NEWLINK
, NLM_F_MULTI
,
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
), },
225 static int br_afspec(struct net_bridge
*br
,
226 struct net_bridge_port
*p
,
227 struct nlattr
*af_spec
,
230 struct nlattr
*tb
[IFLA_BRIDGE_MAX
+1];
233 err
= nla_parse_nested(tb
, IFLA_BRIDGE_MAX
, af_spec
, ifla_br_policy
);
237 if (tb
[IFLA_BRIDGE_VLAN_INFO
]) {
238 struct bridge_vlan_info
*vinfo
;
240 vinfo
= nla_data(tb
[IFLA_BRIDGE_VLAN_INFO
]);
242 if (vinfo
->vid
>= VLAN_N_VID
)
248 err
= nbp_vlan_add(p
, vinfo
->vid
, vinfo
->flags
);
252 if (vinfo
->flags
& BRIDGE_VLAN_INFO_MASTER
)
253 err
= br_vlan_add(p
->br
, vinfo
->vid
,
256 err
= br_vlan_add(br
, vinfo
->vid
, vinfo
->flags
);
265 nbp_vlan_delete(p
, vinfo
->vid
);
266 if (vinfo
->flags
& BRIDGE_VLAN_INFO_MASTER
)
267 br_vlan_delete(p
->br
, vinfo
->vid
);
269 br_vlan_delete(br
, vinfo
->vid
);
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
},
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
)
289 if (state
> BR_STATE_BLOCKING
)
292 /* if kernel STP is running, don't allow changes */
293 if (p
->br
->stp_enabled
== BR_KERNEL_STP
)
296 /* if device is not up, change is not allowed
297 * if link is not present, only allowable state is disabled
299 if (!netif_running(p
->dev
) ||
300 (!netif_oper_up(p
->dev
) && state
!= BR_STATE_DISABLED
))
305 br_port_state_selection(p
->br
);
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
)
314 u8 flag
= nla_get_u8(tb
[attrtype
]);
322 /* Process bridge protocol info on port */
323 static int br_setport(struct net_bridge_port
*p
, struct nlattr
*tb
[])
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
);
332 if (tb
[IFLA_BRPORT_COST
]) {
333 err
= br_stp_set_path_cost(p
, nla_get_u32(tb
[IFLA_BRPORT_COST
]));
338 if (tb
[IFLA_BRPORT_PRIORITY
]) {
339 err
= br_stp_set_port_priority(p
, nla_get_u16(tb
[IFLA_BRPORT_PRIORITY
]));
344 if (tb
[IFLA_BRPORT_STATE
]) {
345 err
= br_set_port_state(p
, nla_get_u8(tb
[IFLA_BRPORT_STATE
]));
352 /* Change state and parameters on port. */
353 int br_setlink(struct net_device
*dev
, struct nlmsghdr
*nlh
)
355 struct nlattr
*protinfo
;
356 struct nlattr
*afspec
;
357 struct net_bridge_port
*p
;
358 struct nlattr
*tb
[IFLA_BRPORT_MAX
+ 1];
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
)
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
374 if (protinfo
->nla_type
& NLA_F_NESTED
) {
375 err
= nla_parse_nested(tb
, IFLA_BRPORT_MAX
,
376 protinfo
, ifla_brport_policy
);
380 spin_lock_bh(&p
->br
->lock
);
381 err
= br_setport(p
, tb
);
382 spin_unlock_bh(&p
->br
->lock
);
384 /* Binary compatability with old RSTP */
385 if (nla_len(protinfo
) < sizeof(u8
))
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
);
397 err
= br_afspec((struct net_bridge
*)netdev_priv(dev
), p
,
398 afspec
, RTM_SETLINK
);
402 br_ifinfo_notify(RTM_NEWLINK
, p
);
408 /* Delete port information */
409 int br_dellink(struct net_device
*dev
, struct nlmsghdr
*nlh
)
411 struct nlattr
*afspec
;
412 struct net_bridge_port
*p
;
415 afspec
= nlmsg_find_attr(nlh
, sizeof(struct ifinfomsg
), IFLA_AF_SPEC
);
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
))
424 err
= br_afspec((struct net_bridge
*)netdev_priv(dev
), p
,
425 afspec
, RTM_DELLINK
);
429 static int br_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
431 if (tb
[IFLA_ADDRESS
]) {
432 if (nla_len(tb
[IFLA_ADDRESS
]) != ETH_ALEN
)
434 if (!is_valid_ether_addr(nla_data(tb
[IFLA_ADDRESS
])))
435 return -EADDRNOTAVAIL
;
441 static size_t br_get_link_af_size(const struct net_device
*dev
)
443 struct net_port_vlans
*pv
;
445 if (br_port_exists(dev
))
446 pv
= nbp_get_vlan_info(br_port_get_rcu(dev
));
447 else if (dev
->priv_flags
& IFF_EBRIDGE
)
448 pv
= br_get_vlan_info((struct net_bridge
*)netdev_priv(dev
));
455 /* Each VLAN is returned in bridge_vlan_info along with flags */
456 return pv
->num_vlans
* nla_total_size(sizeof(struct bridge_vlan_info
));
459 static struct rtnl_af_ops br_af_ops
= {
461 .get_link_af_size
= br_get_link_af_size
,
464 struct rtnl_link_ops br_link_ops __read_mostly
= {
466 .priv_size
= sizeof(struct net_bridge
),
467 .setup
= br_dev_setup
,
468 .validate
= br_validate
,
469 .dellink
= br_dev_delete
,
472 int __init
br_netlink_init(void)
477 err
= rtnl_af_register(&br_af_ops
);
481 err
= rtnl_link_register(&br_link_ops
);
488 rtnl_af_unregister(&br_af_ops
);
494 void __exit
br_netlink_fini(void)
497 rtnl_af_unregister(&br_af_ops
);
498 rtnl_link_unregister(&br_link_ops
);