blob: f5d69336d97b037eff3e912cd3e596b639e0ef0c [file] [log] [blame]
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>
Thomas Graf32fe21c2007-03-22 11:59:03 -070014#include <net/rtnetlink.h>
Eric W. Biederman881d9662007-09-17 11:56:21 -070015#include <net/net_namespace.h>
Denis V. Lunevb8542722007-12-01 00:21:31 +110016#include <net/sock.h>
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070017#include "br_private.h"
18
Thomas Graf339bf982006-11-10 14:10:15 -080019static inline size_t br_nlmsg_size(void)
20{
21 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
22 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
23 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
24 + nla_total_size(4) /* IFLA_MASTER */
25 + nla_total_size(4) /* IFLA_MTU */
26 + nla_total_size(4) /* IFLA_LINK */
27 + nla_total_size(1) /* IFLA_OPERSTATE */
28 + nla_total_size(1); /* IFLA_PROTINFO */
29}
30
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070031/*
32 * Create one netlink message for one interface
33 * Contains port and master info as well as carrier and bridge state.
34 */
35static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port,
36 u32 pid, u32 seq, int event, unsigned int flags)
37{
38 const struct net_bridge *br = port->br;
39 const struct net_device *dev = port->dev;
Thomas Graf74685962006-11-20 16:20:22 -080040 struct ifinfomsg *hdr;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070041 struct nlmsghdr *nlh;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070042 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070043
44 pr_debug("br_fill_info event %d port %s master %s\n",
45 event, dev->name, br->dev->name);
46
Thomas Graf74685962006-11-20 16:20:22 -080047 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
48 if (nlh == NULL)
Patrick McHardy26932562007-01-31 23:16:40 -080049 return -EMSGSIZE;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070050
Thomas Graf74685962006-11-20 16:20:22 -080051 hdr = nlmsg_data(nlh);
52 hdr->ifi_family = AF_BRIDGE;
53 hdr->__ifi_pad = 0;
54 hdr->ifi_type = dev->type;
55 hdr->ifi_index = dev->ifindex;
56 hdr->ifi_flags = dev_get_flags(dev);
57 hdr->ifi_change = 0;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070058
Thomas Graf74685962006-11-20 16:20:22 -080059 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
60 NLA_PUT_U32(skb, IFLA_MASTER, br->dev->ifindex);
61 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
62 NLA_PUT_U8(skb, IFLA_OPERSTATE, operstate);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070063
64 if (dev->addr_len)
Thomas Graf74685962006-11-20 16:20:22 -080065 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070066
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070067 if (dev->ifindex != dev->iflink)
Thomas Graf74685962006-11-20 16:20:22 -080068 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070069
70 if (event == RTM_NEWLINK)
Thomas Graf74685962006-11-20 16:20:22 -080071 NLA_PUT_U8(skb, IFLA_PROTINFO, port->state);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070072
Thomas Graf74685962006-11-20 16:20:22 -080073 return nlmsg_end(skb, nlh);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070074
Thomas Graf74685962006-11-20 16:20:22 -080075nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -080076 nlmsg_cancel(skb, nlh);
77 return -EMSGSIZE;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070078}
79
80/*
81 * Notify listeners of a change in port information
82 */
83void br_ifinfo_notify(int event, struct net_bridge_port *port)
84{
85 struct sk_buff *skb;
Thomas Graf280a3062006-08-15 00:36:28 -070086 int err = -ENOBUFS;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070087
88 pr_debug("bridge notify event=%d\n", event);
Thomas Graf339bf982006-11-10 14:10:15 -080089 skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
Thomas Graf280a3062006-08-15 00:36:28 -070090 if (skb == NULL)
91 goto errout;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070092
Thomas Graf280a3062006-08-15 00:36:28 -070093 err = br_fill_ifinfo(skb, port, 0, 0, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -080094 if (err < 0) {
95 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
96 WARN_ON(err == -EMSGSIZE);
97 kfree_skb(skb);
98 goto errout;
99 }
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800100 err = rtnl_notify(skb, &init_net,0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
Thomas Graf280a3062006-08-15 00:36:28 -0700101errout:
Stephen Hemmingerbea1b422006-08-03 16:24:02 -0700102 if (err < 0)
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800103 rtnl_set_sk_err(&init_net, RTNLGRP_LINK, err);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700104}
105
106/*
107 * Dump information about all ports, in response to GETLINK
108 */
109static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
110{
Denis V. Lunevb8542722007-12-01 00:21:31 +1100111 struct net *net = skb->sk->sk_net;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700112 struct net_device *dev;
113 int idx;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700114
Denis V. Lunevb8542722007-12-01 00:21:31 +1100115 if (net != &init_net)
116 return 0;
117
Pavel Emelianov7562f872007-05-03 15:13:45 -0700118 idx = 0;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700119 for_each_netdev(&init_net, dev) {
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700120 /* not a bridge port */
Thomas Graf74685962006-11-20 16:20:22 -0800121 if (dev->br_port == NULL || idx < cb->args[0])
122 goto skip;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700123
Thomas Graf74685962006-11-20 16:20:22 -0800124 if (br_fill_ifinfo(skb, dev->br_port, NETLINK_CB(cb->skb).pid,
125 cb->nlh->nlmsg_seq, RTM_NEWLINK,
126 NLM_F_MULTI) < 0)
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700127 break;
Thomas Graf74685962006-11-20 16:20:22 -0800128skip:
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700129 ++idx;
130 }
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700131
132 cb->args[0] = idx;
133
134 return skb->len;
135}
136
137/*
138 * Change state of port (ie from forwarding to blocking etc)
139 * Used by spanning tree in user space.
140 */
141static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
142{
Denis V. Lunevb8542722007-12-01 00:21:31 +1100143 struct net *net = skb->sk->sk_net;
Thomas Graf74685962006-11-20 16:20:22 -0800144 struct ifinfomsg *ifm;
145 struct nlattr *protinfo;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700146 struct net_device *dev;
147 struct net_bridge_port *p;
148 u8 new_state;
149
Denis V. Lunevb8542722007-12-01 00:21:31 +1100150 if (net != &init_net)
151 return -EINVAL;
152
Thomas Graf74685962006-11-20 16:20:22 -0800153 if (nlmsg_len(nlh) < sizeof(*ifm))
154 return -EINVAL;
155
156 ifm = nlmsg_data(nlh);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700157 if (ifm->ifi_family != AF_BRIDGE)
158 return -EPFNOSUPPORT;
159
Thomas Graf74685962006-11-20 16:20:22 -0800160 protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO);
161 if (!protinfo || nla_len(protinfo) < sizeof(u8))
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700162 return -EINVAL;
163
Thomas Graf74685962006-11-20 16:20:22 -0800164 new_state = nla_get_u8(protinfo);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700165 if (new_state > BR_STATE_BLOCKING)
166 return -EINVAL;
167
Eric W. Biederman881d9662007-09-17 11:56:21 -0700168 dev = __dev_get_by_index(&init_net, ifm->ifi_index);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700169 if (!dev)
170 return -ENODEV;
171
172 p = dev->br_port;
173 if (!p)
174 return -EINVAL;
175
176 /* if kernel STP is running, don't allow changes */
Stephen Hemminger9cde0702007-03-21 14:22:44 -0700177 if (p->br->stp_enabled == BR_KERNEL_STP)
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700178 return -EBUSY;
179
Thomas Graf74685962006-11-20 16:20:22 -0800180 if (!netif_running(dev) ||
181 (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED))
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700182 return -ENETDOWN;
183
184 p->state = new_state;
185 br_log_state(p);
186 return 0;
187}
188
189
Thomas Graf32fe21c2007-03-22 11:59:03 -0700190int __init br_netlink_init(void)
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700191{
Thomas Graf32fe21c2007-03-22 11:59:03 -0700192 if (__rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, br_dump_ifinfo))
193 return -ENOBUFS;
194
195 /* Only the first call to __rtnl_register can fail */
196 __rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL);
197
198 return 0;
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700199}
200
201void __exit br_netlink_fini(void)
202{
Thomas Graf32fe21c2007-03-22 11:59:03 -0700203 rtnl_unregister_all(PF_BRIDGE);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700204}
205