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/rtnetlink.h>
15 #include <net/netlink.h>
16 #include "br_private.h"
18 static inline size_t br_nlmsg_size(void)
20 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
21 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
22 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
23 + nla_total_size(4) /* IFLA_MASTER */
24 + nla_total_size(4) /* IFLA_MTU */
25 + nla_total_size(4) /* IFLA_LINK */
26 + nla_total_size(1) /* IFLA_OPERSTATE */
27 + nla_total_size(1); /* IFLA_PROTINFO */
31 * Create one netlink message for one interface
32 * Contains port and master info as well as carrier and bridge state.
34 static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port,
35 u32 pid, u32 seq, int event, unsigned int flags)
37 const struct net_bridge *br = port->br;
38 const struct net_device *dev = port->dev;
41 unsigned char *b = skb->tail;
43 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
44 u8 portstate = port->state;
46 pr_debug("br_fill_info event %d port %s master %s\n",
47 event, dev->name, br->dev->name);
49 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
51 r->ifi_family = AF_BRIDGE;
53 r->ifi_type = dev->type;
54 r->ifi_index = dev->ifindex;
55 r->ifi_flags = dev_get_flags(dev);
58 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
60 RTA_PUT(skb, IFLA_MASTER, sizeof(int), &br->dev->ifindex);
63 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
65 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
66 if (dev->ifindex != dev->iflink)
67 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
70 RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate);
72 if (event == RTM_NEWLINK)
73 RTA_PUT(skb, IFLA_PROTINFO, sizeof(portstate), &portstate);
75 nlh->nlmsg_len = skb->tail - b;
82 skb_trim(skb, b - skb->data);
87 * Notify listeners of a change in port information
89 void br_ifinfo_notify(int event, struct net_bridge_port *port)
94 pr_debug("bridge notify event=%d\n", event);
95 skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
99 err = br_fill_ifinfo(skb, port, 0, 0, event, 0);
100 /* failure implies BUG in br_nlmsg_size() */
103 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
106 rtnl_set_sk_err(RTNLGRP_LINK, err);
110 * Dump information about all ports, in response to GETLINK
112 static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
114 struct net_device *dev;
116 int s_idx = cb->args[0];
119 read_lock(&dev_base_lock);
120 for (dev = dev_base, idx = 0; dev; dev = dev->next) {
121 struct net_bridge_port *p = dev->br_port;
123 /* not a bridge port */
130 err = br_fill_ifinfo(skb, p, NETLINK_CB(cb->skb).pid,
131 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
137 read_unlock(&dev_base_lock);
145 * Change state of port (ie from forwarding to blocking etc)
146 * Used by spanning tree in user space.
148 static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
150 struct rtattr **rta = arg;
151 struct ifinfomsg *ifm = NLMSG_DATA(nlh);
152 struct net_device *dev;
153 struct net_bridge_port *p;
156 if (ifm->ifi_family != AF_BRIDGE)
157 return -EPFNOSUPPORT;
159 /* Must pass valid state as PROTINFO */
160 if (rta[IFLA_PROTINFO-1]) {
161 u8 *pstate = RTA_DATA(rta[IFLA_PROTINFO-1]);
166 if (new_state > BR_STATE_BLOCKING)
169 /* Find bridge port */
170 dev = __dev_get_by_index(ifm->ifi_index);
178 /* if kernel STP is running, don't allow changes */
179 if (p->br->stp_enabled)
182 if (!netif_running(dev))
185 if (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED)
188 p->state = new_state;
194 static struct rtnetlink_link bridge_rtnetlink_table[RTM_NR_MSGTYPES] = {
195 [RTM_GETLINK - RTM_BASE] = { .dumpit = br_dump_ifinfo, },
196 [RTM_SETLINK - RTM_BASE] = { .doit = br_rtm_setlink, },
199 void __init br_netlink_init(void)
201 rtnetlink_links[PF_BRIDGE] = bridge_rtnetlink_table;
204 void __exit br_netlink_fini(void)
206 rtnetlink_links[PF_BRIDGE] = NULL;