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Stephen Hemminger11dc1f32006-05-25 16:00:12 -07001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
Thomas Graf32fe21c2007-03-22 11:59:03 -070015#include <net/rtnetlink.h>
Eric W. Biederman881d9662007-09-17 11:56:21 -070016#include <net/net_namespace.h>
Denis V. Lunevb8542722007-12-01 00:21:31 +110017#include <net/sock.h>
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070018#include "br_private.h"
19
Thomas Graf339bf982006-11-10 14:10:15 -080020static inline size_t br_nlmsg_size(void)
21{
22 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
23 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
24 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
25 + nla_total_size(4) /* IFLA_MASTER */
26 + nla_total_size(4) /* IFLA_MTU */
27 + nla_total_size(4) /* IFLA_LINK */
28 + nla_total_size(1) /* IFLA_OPERSTATE */
29 + nla_total_size(1); /* IFLA_PROTINFO */
30}
31
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070032/*
33 * Create one netlink message for one interface
34 * Contains port and master info as well as carrier and bridge state.
35 */
36static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port,
37 u32 pid, u32 seq, int event, unsigned int flags)
38{
39 const struct net_bridge *br = port->br;
40 const struct net_device *dev = port->dev;
Thomas Graf74685962006-11-20 16:20:22 -080041 struct ifinfomsg *hdr;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070042 struct nlmsghdr *nlh;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070043 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070044
stephen hemminger28a16c92010-05-10 09:31:09 +000045 br_debug(br, "br_fill_info event %d port %s master %s\n",
46 event, dev->name, br->dev->name);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070047
Thomas Graf74685962006-11-20 16:20:22 -080048 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
49 if (nlh == NULL)
Patrick McHardy26932562007-01-31 23:16:40 -080050 return -EMSGSIZE;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070051
Thomas Graf74685962006-11-20 16:20:22 -080052 hdr = nlmsg_data(nlh);
53 hdr->ifi_family = AF_BRIDGE;
54 hdr->__ifi_pad = 0;
55 hdr->ifi_type = dev->type;
56 hdr->ifi_index = dev->ifindex;
57 hdr->ifi_flags = dev_get_flags(dev);
58 hdr->ifi_change = 0;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070059
Thomas Graf74685962006-11-20 16:20:22 -080060 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
61 NLA_PUT_U32(skb, IFLA_MASTER, br->dev->ifindex);
62 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
63 NLA_PUT_U8(skb, IFLA_OPERSTATE, operstate);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070064
65 if (dev->addr_len)
Thomas Graf74685962006-11-20 16:20:22 -080066 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070067
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070068 if (dev->ifindex != dev->iflink)
Thomas Graf74685962006-11-20 16:20:22 -080069 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070070
71 if (event == RTM_NEWLINK)
Thomas Graf74685962006-11-20 16:20:22 -080072 NLA_PUT_U8(skb, IFLA_PROTINFO, port->state);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070073
Thomas Graf74685962006-11-20 16:20:22 -080074 return nlmsg_end(skb, nlh);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070075
Thomas Graf74685962006-11-20 16:20:22 -080076nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -080077 nlmsg_cancel(skb, nlh);
78 return -EMSGSIZE;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070079}
80
81/*
82 * Notify listeners of a change in port information
83 */
84void br_ifinfo_notify(int event, struct net_bridge_port *port)
85{
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -070086 struct net *net = dev_net(port->dev);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070087 struct sk_buff *skb;
Thomas Graf280a3062006-08-15 00:36:28 -070088 int err = -ENOBUFS;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070089
stephen hemminger28a16c92010-05-10 09:31:09 +000090 br_debug(port->br, "port %u(%s) event %d\n",
91 (unsigned)port->port_no, port->dev->name, event);
92
Thomas Graf339bf982006-11-10 14:10:15 -080093 skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
Thomas Graf280a3062006-08-15 00:36:28 -070094 if (skb == NULL)
95 goto errout;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070096
Thomas Graf280a3062006-08-15 00:36:28 -070097 err = br_fill_ifinfo(skb, port, 0, 0, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -080098 if (err < 0) {
99 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
100 WARN_ON(err == -EMSGSIZE);
101 kfree_skb(skb);
102 goto errout;
103 }
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -0800104 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
105 return;
Thomas Graf280a3062006-08-15 00:36:28 -0700106errout:
Stephen Hemmingerbea1b422006-08-03 16:24:02 -0700107 if (err < 0)
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700108 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700109}
110
111/*
112 * Dump information about all ports, in response to GETLINK
113 */
114static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
115{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900116 struct net *net = sock_net(skb->sk);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700117 struct net_device *dev;
118 int idx;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700119
Pavel Emelianov7562f872007-05-03 15:13:45 -0700120 idx = 0;
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700121 for_each_netdev(net, dev) {
Eric Dumazetec1e5612010-11-15 06:38:14 +0000122 struct net_bridge_port *port = br_port_get_rtnl(dev);
stephen hemmingerb5ed54e2010-11-15 06:38:13 +0000123
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700124 /* not a bridge port */
stephen hemmingerb5ed54e2010-11-15 06:38:13 +0000125 if (!port || idx < cb->args[0])
Thomas Graf74685962006-11-20 16:20:22 -0800126 goto skip;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700127
stephen hemmingerb5ed54e2010-11-15 06:38:13 +0000128 if (br_fill_ifinfo(skb, port,
Jiri Pirkof350a0a2010-06-15 06:50:45 +0000129 NETLINK_CB(cb->skb).pid,
Thomas Graf74685962006-11-20 16:20:22 -0800130 cb->nlh->nlmsg_seq, RTM_NEWLINK,
131 NLM_F_MULTI) < 0)
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700132 break;
Thomas Graf74685962006-11-20 16:20:22 -0800133skip:
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700134 ++idx;
135 }
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700136
137 cb->args[0] = idx;
138
139 return skb->len;
140}
141
142/*
143 * Change state of port (ie from forwarding to blocking etc)
144 * Used by spanning tree in user space.
145 */
146static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
147{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900148 struct net *net = sock_net(skb->sk);
Thomas Graf74685962006-11-20 16:20:22 -0800149 struct ifinfomsg *ifm;
150 struct nlattr *protinfo;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700151 struct net_device *dev;
152 struct net_bridge_port *p;
153 u8 new_state;
154
Thomas Graf74685962006-11-20 16:20:22 -0800155 if (nlmsg_len(nlh) < sizeof(*ifm))
156 return -EINVAL;
157
158 ifm = nlmsg_data(nlh);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700159 if (ifm->ifi_family != AF_BRIDGE)
160 return -EPFNOSUPPORT;
161
Thomas Graf74685962006-11-20 16:20:22 -0800162 protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO);
163 if (!protinfo || nla_len(protinfo) < sizeof(u8))
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700164 return -EINVAL;
165
Thomas Graf74685962006-11-20 16:20:22 -0800166 new_state = nla_get_u8(protinfo);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700167 if (new_state > BR_STATE_BLOCKING)
168 return -EINVAL;
169
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700170 dev = __dev_get_by_index(net, ifm->ifi_index);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700171 if (!dev)
172 return -ENODEV;
173
Eric Dumazetec1e5612010-11-15 06:38:14 +0000174 p = br_port_get_rtnl(dev);
stephen hemmingerb5ed54e2010-11-15 06:38:13 +0000175 if (!p)
176 return -EINVAL;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700177
178 /* if kernel STP is running, don't allow changes */
Stephen Hemminger9cde0702007-03-21 14:22:44 -0700179 if (p->br->stp_enabled == BR_KERNEL_STP)
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700180 return -EBUSY;
181
Thomas Graf74685962006-11-20 16:20:22 -0800182 if (!netif_running(dev) ||
183 (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED))
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700184 return -ENETDOWN;
185
186 p->state = new_state;
187 br_log_state(p);
188 return 0;
189}
190
191
Thomas Graf32fe21c2007-03-22 11:59:03 -0700192int __init br_netlink_init(void)
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700193{
Thomas Graf32fe21c2007-03-22 11:59:03 -0700194 if (__rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, br_dump_ifinfo))
195 return -ENOBUFS;
196
197 /* Only the first call to __rtnl_register can fail */
198 __rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL);
199
200 return 0;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700201}
202
203void __exit br_netlink_fini(void)
204{
Thomas Graf32fe21c2007-03-22 11:59:03 -0700205 rtnl_unregister_all(PF_BRIDGE);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700206}
207