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/slab.h>
15 #include <linux/etherdevice.h>
16 #include <net/rtnetlink.h>
17 #include <net/net_namespace.h>
20 #include "br_private.h"
21 #include "br_private_stp.h"
23 static inline size_t br_port_info_size(void)
25 return nla_total_size(1) /* IFLA_BRPORT_STATE */
26 + nla_total_size(2) /* IFLA_BRPORT_PRIORITY */
27 + nla_total_size(4) /* IFLA_BRPORT_COST */
28 + nla_total_size(1) /* IFLA_BRPORT_MODE */
29 + nla_total_size(1) /* IFLA_BRPORT_GUARD */
30 + nla_total_size(1) /* IFLA_BRPORT_PROTECT */
34 static inline size_t br_nlmsg_size(void)
36 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
37 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
38 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
39 + nla_total_size(4) /* IFLA_MASTER */
40 + nla_total_size(4) /* IFLA_MTU */
41 + nla_total_size(4) /* IFLA_LINK */
42 + nla_total_size(1) /* IFLA_OPERSTATE */
43 + nla_total_size(br_port_info_size()); /* IFLA_PROTINFO */
46 static int br_port_fill_attrs(struct sk_buff *skb,
47 const struct net_bridge_port *p)
49 u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
51 if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
52 nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
53 nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
54 nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
55 nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
56 nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)))
63 * Create one netlink message for one interface
64 * Contains port and master info as well as carrier and bridge state.
66 static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port,
67 u32 pid, u32 seq, int event, unsigned int flags)
69 const struct net_bridge *br = port->br;
70 const struct net_device *dev = port->dev;
71 struct ifinfomsg *hdr;
73 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
75 br_debug(br, "br_fill_info event %d port %s master %s\n",
76 event, dev->name, br->dev->name);
78 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
82 hdr = nlmsg_data(nlh);
83 hdr->ifi_family = AF_BRIDGE;
85 hdr->ifi_type = dev->type;
86 hdr->ifi_index = dev->ifindex;
87 hdr->ifi_flags = dev_get_flags(dev);
90 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
91 nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
92 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
93 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
95 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
96 (dev->ifindex != dev->iflink &&
97 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
100 if (event == RTM_NEWLINK) {
102 = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
104 if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
105 goto nla_put_failure;
106 nla_nest_end(skb, nest);
109 return nlmsg_end(skb, nlh);
112 nlmsg_cancel(skb, nlh);
117 * Notify listeners of a change in port information
119 void br_ifinfo_notify(int event, struct net_bridge_port *port)
121 struct net *net = dev_net(port->dev);
125 br_debug(port->br, "port %u(%s) event %d\n",
126 (unsigned int)port->port_no, port->dev->name, event);
128 skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
132 err = br_fill_ifinfo(skb, port, 0, 0, event, 0);
134 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
135 WARN_ON(err == -EMSGSIZE);
139 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
143 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
147 * Dump information about all ports, in response to GETLINK
149 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
150 struct net_device *dev)
153 struct net_bridge_port *port = br_port_get_rcu(dev);
155 /* not a bridge port */
159 err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI);
164 static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = {
165 [IFLA_BRPORT_STATE] = { .type = NLA_U8 },
166 [IFLA_BRPORT_COST] = { .type = NLA_U32 },
167 [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
168 [IFLA_BRPORT_MODE] = { .type = NLA_U8 },
169 [IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
170 [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
173 /* Change the state of the port and notify spanning tree */
174 static int br_set_port_state(struct net_bridge_port *p, u8 state)
176 if (state > BR_STATE_BLOCKING)
179 /* if kernel STP is running, don't allow changes */
180 if (p->br->stp_enabled == BR_KERNEL_STP)
183 if (!netif_running(p->dev) ||
184 (!netif_carrier_ok(p->dev) && state != BR_STATE_DISABLED))
189 br_port_state_selection(p->br);
193 /* Set/clear or port flags based on attribute */
194 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
195 int attrtype, unsigned long mask)
198 u8 flag = nla_get_u8(tb[attrtype]);
206 /* Process bridge protocol info on port */
207 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
211 br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
212 br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
214 if (tb[IFLA_BRPORT_COST]) {
215 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
220 if (tb[IFLA_BRPORT_PRIORITY]) {
221 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
226 if (tb[IFLA_BRPORT_STATE]) {
227 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
234 /* Change state and parameters on port. */
235 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
237 struct ifinfomsg *ifm;
238 struct nlattr *protinfo;
239 struct net_bridge_port *p;
240 struct nlattr *tb[IFLA_BRPORT_MAX];
243 ifm = nlmsg_data(nlh);
245 protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO);
249 p = br_port_get_rtnl(dev);
253 if (protinfo->nla_type & NLA_F_NESTED) {
254 err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
255 protinfo, ifla_brport_policy);
259 spin_lock_bh(&p->br->lock);
260 err = br_setport(p, tb);
261 spin_unlock_bh(&p->br->lock);
263 /* Binary compatability with old RSTP */
264 if (nla_len(protinfo) < sizeof(u8))
267 spin_lock_bh(&p->br->lock);
268 err = br_set_port_state(p, nla_get_u8(protinfo));
269 spin_unlock_bh(&p->br->lock);
273 br_ifinfo_notify(RTM_NEWLINK, p);
278 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
280 if (tb[IFLA_ADDRESS]) {
281 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
283 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
284 return -EADDRNOTAVAIL;
290 struct rtnl_link_ops br_link_ops __read_mostly = {
292 .priv_size = sizeof(struct net_bridge),
293 .setup = br_dev_setup,
294 .validate = br_validate,
295 .dellink = br_dev_delete,
298 int __init br_netlink_init(void)
300 return rtnl_link_register(&br_link_ops);
303 void __exit br_netlink_fini(void)
305 rtnl_link_unregister(&br_link_ops);
306 rtnl_unregister_all(PF_BRIDGE);