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 <net/rtnetlink.h>
15 #include "br_private.h"
17 static inline size_t br_nlmsg_size(void)
19 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
20 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
21 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
22 + nla_total_size(4) /* IFLA_MASTER */
23 + nla_total_size(4) /* IFLA_MTU */
24 + nla_total_size(4) /* IFLA_LINK */
25 + nla_total_size(1) /* IFLA_OPERSTATE */
26 + nla_total_size(1); /* IFLA_PROTINFO */
30 * Create one netlink message for one interface
31 * Contains port and master info as well as carrier and bridge state.
33 static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port,
34 u32 pid, u32 seq, int event, unsigned int flags)
36 const struct net_bridge *br = port->br;
37 const struct net_device *dev = port->dev;
38 struct ifinfomsg *hdr;
40 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
42 pr_debug("br_fill_info event %d port %s master %s\n",
43 event, dev->name, br->dev->name);
45 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
49 hdr = nlmsg_data(nlh);
50 hdr->ifi_family = AF_BRIDGE;
52 hdr->ifi_type = dev->type;
53 hdr->ifi_index = dev->ifindex;
54 hdr->ifi_flags = dev_get_flags(dev);
57 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
58 NLA_PUT_U32(skb, IFLA_MASTER, br->dev->ifindex);
59 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
60 NLA_PUT_U8(skb, IFLA_OPERSTATE, operstate);
63 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
65 if (dev->ifindex != dev->iflink)
66 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
68 if (event == RTM_NEWLINK)
69 NLA_PUT_U8(skb, IFLA_PROTINFO, port->state);
71 return nlmsg_end(skb, nlh);
74 nlmsg_cancel(skb, nlh);
79 * Notify listeners of a change in port information
81 void br_ifinfo_notify(int event, struct net_bridge_port *port)
86 pr_debug("bridge notify event=%d\n", event);
87 skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
91 err = br_fill_ifinfo(skb, port, 0, 0, event, 0);
93 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
94 WARN_ON(err == -EMSGSIZE);
98 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
101 rtnl_set_sk_err(RTNLGRP_LINK, err);
105 * Dump information about all ports, in response to GETLINK
107 static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
109 struct net_device *dev;
112 for (dev = dev_base, idx = 0; dev; dev = dev->next) {
113 /* not a bridge port */
114 if (dev->br_port == NULL || idx < cb->args[0])
117 if (br_fill_ifinfo(skb, dev->br_port, NETLINK_CB(cb->skb).pid,
118 cb->nlh->nlmsg_seq, RTM_NEWLINK,
131 * Change state of port (ie from forwarding to blocking etc)
132 * Used by spanning tree in user space.
134 static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
136 struct ifinfomsg *ifm;
137 struct nlattr *protinfo;
138 struct net_device *dev;
139 struct net_bridge_port *p;
142 if (nlmsg_len(nlh) < sizeof(*ifm))
145 ifm = nlmsg_data(nlh);
146 if (ifm->ifi_family != AF_BRIDGE)
147 return -EPFNOSUPPORT;
149 protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO);
150 if (!protinfo || nla_len(protinfo) < sizeof(u8))
153 new_state = nla_get_u8(protinfo);
154 if (new_state > BR_STATE_BLOCKING)
157 dev = __dev_get_by_index(ifm->ifi_index);
165 /* if kernel STP is running, don't allow changes */
166 if (p->br->stp_enabled == BR_KERNEL_STP)
169 if (!netif_running(dev) ||
170 (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED))
173 p->state = new_state;
179 int __init br_netlink_init(void)
181 if (__rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, br_dump_ifinfo))
184 /* Only the first call to __rtnl_register can fail */
185 __rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL);
190 void __exit br_netlink_fini(void)
192 rtnl_unregister_all(PF_BRIDGE);