[CONNECTOR]: Replace delayed work with usual work queue.
[linux-2.6/verdex.git] / net / bridge / br_netlink.c
bloba9139682c49bf1aa9697fdbf1c4e5d2ebe29222a
1 /*
2 * Bridge netlink control interface
4 * Authors:
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;
39 struct ifinfomsg *hdr;
40 struct nlmsghdr *nlh;
41 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
43 pr_debug("br_fill_info event %d port %s master %s\n",
44 event, dev->name, br->dev->name);
46 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
47 if (nlh == NULL)
48 return -ENOBUFS;
50 hdr = nlmsg_data(nlh);
51 hdr->ifi_family = AF_BRIDGE;
52 hdr->__ifi_pad = 0;
53 hdr->ifi_type = dev->type;
54 hdr->ifi_index = dev->ifindex;
55 hdr->ifi_flags = dev_get_flags(dev);
56 hdr->ifi_change = 0;
58 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
59 NLA_PUT_U32(skb, IFLA_MASTER, br->dev->ifindex);
60 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
61 NLA_PUT_U8(skb, IFLA_OPERSTATE, operstate);
63 if (dev->addr_len)
64 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
66 if (dev->ifindex != dev->iflink)
67 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
69 if (event == RTM_NEWLINK)
70 NLA_PUT_U8(skb, IFLA_PROTINFO, port->state);
72 return nlmsg_end(skb, nlh);
74 nla_put_failure:
75 return 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)
83 struct sk_buff *skb;
84 int err = -ENOBUFS;
86 pr_debug("bridge notify event=%d\n", event);
87 skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
88 if (skb == NULL)
89 goto errout;
91 err = br_fill_ifinfo(skb, port, 0, 0, event, 0);
92 /* failure implies BUG in br_nlmsg_size() */
93 BUG_ON(err < 0);
95 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
96 errout:
97 if (err < 0)
98 rtnl_set_sk_err(RTNLGRP_LINK, err);
102 * Dump information about all ports, in response to GETLINK
104 static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
106 struct net_device *dev;
107 int idx;
109 read_lock(&dev_base_lock);
110 for (dev = dev_base, idx = 0; dev; dev = dev->next) {
111 /* not a bridge port */
112 if (dev->br_port == NULL || idx < cb->args[0])
113 goto skip;
115 if (br_fill_ifinfo(skb, dev->br_port, NETLINK_CB(cb->skb).pid,
116 cb->nlh->nlmsg_seq, RTM_NEWLINK,
117 NLM_F_MULTI) < 0)
118 break;
119 skip:
120 ++idx;
122 read_unlock(&dev_base_lock);
124 cb->args[0] = idx;
126 return skb->len;
130 * Change state of port (ie from forwarding to blocking etc)
131 * Used by spanning tree in user space.
133 static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
135 struct ifinfomsg *ifm;
136 struct nlattr *protinfo;
137 struct net_device *dev;
138 struct net_bridge_port *p;
139 u8 new_state;
141 if (nlmsg_len(nlh) < sizeof(*ifm))
142 return -EINVAL;
144 ifm = nlmsg_data(nlh);
145 if (ifm->ifi_family != AF_BRIDGE)
146 return -EPFNOSUPPORT;
148 protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO);
149 if (!protinfo || nla_len(protinfo) < sizeof(u8))
150 return -EINVAL;
152 new_state = nla_get_u8(protinfo);
153 if (new_state > BR_STATE_BLOCKING)
154 return -EINVAL;
156 dev = __dev_get_by_index(ifm->ifi_index);
157 if (!dev)
158 return -ENODEV;
160 p = dev->br_port;
161 if (!p)
162 return -EINVAL;
164 /* if kernel STP is running, don't allow changes */
165 if (p->br->stp_enabled)
166 return -EBUSY;
168 if (!netif_running(dev) ||
169 (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED))
170 return -ENETDOWN;
172 p->state = new_state;
173 br_log_state(p);
174 return 0;
178 static struct rtnetlink_link bridge_rtnetlink_table[RTM_NR_MSGTYPES] = {
179 [RTM_GETLINK - RTM_BASE] = { .dumpit = br_dump_ifinfo, },
180 [RTM_SETLINK - RTM_BASE] = { .doit = br_rtm_setlink, },
183 void __init br_netlink_init(void)
185 rtnetlink_links[PF_BRIDGE] = bridge_rtnetlink_table;
188 void __exit br_netlink_fini(void)
190 rtnetlink_links[PF_BRIDGE] = NULL;