Commit | Line | Data |
---|---|---|
11dc1f36 SH |
1 | /* |
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> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
bb900b27 | 15 | #include <linux/etherdevice.h> |
32fe21c0 | 16 | #include <net/rtnetlink.h> |
881d966b | 17 | #include <net/net_namespace.h> |
b854272b | 18 | #include <net/sock.h> |
bb900b27 | 19 | |
11dc1f36 | 20 | #include "br_private.h" |
b03b6dd5 | 21 | #include "br_private_stp.h" |
11dc1f36 | 22 | |
339bf98f TG |
23 | static inline size_t br_nlmsg_size(void) |
24 | { | |
25 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) | |
26 | + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ | |
27 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ | |
28 | + nla_total_size(4) /* IFLA_MASTER */ | |
29 | + nla_total_size(4) /* IFLA_MTU */ | |
30 | + nla_total_size(4) /* IFLA_LINK */ | |
31 | + nla_total_size(1) /* IFLA_OPERSTATE */ | |
32 | + nla_total_size(1); /* IFLA_PROTINFO */ | |
33 | } | |
34 | ||
11dc1f36 SH |
35 | /* |
36 | * Create one netlink message for one interface | |
37 | * Contains port and master info as well as carrier and bridge state. | |
38 | */ | |
39 | static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port, | |
40 | u32 pid, u32 seq, int event, unsigned int flags) | |
41 | { | |
42 | const struct net_bridge *br = port->br; | |
43 | const struct net_device *dev = port->dev; | |
74685962 | 44 | struct ifinfomsg *hdr; |
11dc1f36 | 45 | struct nlmsghdr *nlh; |
11dc1f36 | 46 | u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; |
11dc1f36 | 47 | |
28a16c97 | 48 | br_debug(br, "br_fill_info event %d port %s master %s\n", |
49 | event, dev->name, br->dev->name); | |
11dc1f36 | 50 | |
74685962 TG |
51 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); |
52 | if (nlh == NULL) | |
26932566 | 53 | return -EMSGSIZE; |
11dc1f36 | 54 | |
74685962 TG |
55 | hdr = nlmsg_data(nlh); |
56 | hdr->ifi_family = AF_BRIDGE; | |
57 | hdr->__ifi_pad = 0; | |
58 | hdr->ifi_type = dev->type; | |
59 | hdr->ifi_index = dev->ifindex; | |
60 | hdr->ifi_flags = dev_get_flags(dev); | |
61 | hdr->ifi_change = 0; | |
11dc1f36 | 62 | |
74685962 TG |
63 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); |
64 | NLA_PUT_U32(skb, IFLA_MASTER, br->dev->ifindex); | |
65 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); | |
66 | NLA_PUT_U8(skb, IFLA_OPERSTATE, operstate); | |
11dc1f36 SH |
67 | |
68 | if (dev->addr_len) | |
74685962 | 69 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
11dc1f36 | 70 | |
11dc1f36 | 71 | if (dev->ifindex != dev->iflink) |
74685962 | 72 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); |
11dc1f36 SH |
73 | |
74 | if (event == RTM_NEWLINK) | |
74685962 | 75 | NLA_PUT_U8(skb, IFLA_PROTINFO, port->state); |
11dc1f36 | 76 | |
74685962 | 77 | return nlmsg_end(skb, nlh); |
11dc1f36 | 78 | |
74685962 | 79 | nla_put_failure: |
26932566 PM |
80 | nlmsg_cancel(skb, nlh); |
81 | return -EMSGSIZE; | |
11dc1f36 SH |
82 | } |
83 | ||
84 | /* | |
85 | * Notify listeners of a change in port information | |
86 | */ | |
87 | void br_ifinfo_notify(int event, struct net_bridge_port *port) | |
88 | { | |
4aa678ba | 89 | struct net *net = dev_net(port->dev); |
11dc1f36 | 90 | struct sk_buff *skb; |
280a306c | 91 | int err = -ENOBUFS; |
11dc1f36 | 92 | |
28a16c97 | 93 | br_debug(port->br, "port %u(%s) event %d\n", |
94 | (unsigned)port->port_no, port->dev->name, event); | |
95 | ||
339bf98f | 96 | skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC); |
280a306c TG |
97 | if (skb == NULL) |
98 | goto errout; | |
99 | ||
100 | err = br_fill_ifinfo(skb, port, 0, 0, event, 0); | |
26932566 PM |
101 | if (err < 0) { |
102 | /* -EMSGSIZE implies BUG in br_nlmsg_size() */ | |
103 | WARN_ON(err == -EMSGSIZE); | |
104 | kfree_skb(skb); | |
105 | goto errout; | |
106 | } | |
1ce85fe4 PNA |
107 | rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); |
108 | return; | |
280a306c | 109 | errout: |
bea1b42e | 110 | if (err < 0) |
4aa678ba | 111 | rtnl_set_sk_err(net, RTNLGRP_LINK, err); |
11dc1f36 SH |
112 | } |
113 | ||
114 | /* | |
115 | * Dump information about all ports, in response to GETLINK | |
116 | */ | |
117 | static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) | |
118 | { | |
3b1e0a65 | 119 | struct net *net = sock_net(skb->sk); |
11dc1f36 SH |
120 | struct net_device *dev; |
121 | int idx; | |
11dc1f36 | 122 | |
7562f876 | 123 | idx = 0; |
e67f88dd ED |
124 | rcu_read_lock(); |
125 | for_each_netdev_rcu(net, dev) { | |
126 | struct net_bridge_port *port = br_port_get_rcu(dev); | |
b5ed54e9 | 127 | |
11dc1f36 | 128 | /* not a bridge port */ |
b5ed54e9 | 129 | if (!port || idx < cb->args[0]) |
74685962 | 130 | goto skip; |
11dc1f36 | 131 | |
b5ed54e9 | 132 | if (br_fill_ifinfo(skb, port, |
f350a0a8 | 133 | NETLINK_CB(cb->skb).pid, |
74685962 TG |
134 | cb->nlh->nlmsg_seq, RTM_NEWLINK, |
135 | NLM_F_MULTI) < 0) | |
11dc1f36 | 136 | break; |
74685962 | 137 | skip: |
11dc1f36 SH |
138 | ++idx; |
139 | } | |
e67f88dd | 140 | rcu_read_unlock(); |
11dc1f36 SH |
141 | cb->args[0] = idx; |
142 | ||
143 | return skb->len; | |
144 | } | |
145 | ||
146 | /* | |
147 | * Change state of port (ie from forwarding to blocking etc) | |
148 | * Used by spanning tree in user space. | |
149 | */ | |
150 | static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
151 | { | |
3b1e0a65 | 152 | struct net *net = sock_net(skb->sk); |
74685962 TG |
153 | struct ifinfomsg *ifm; |
154 | struct nlattr *protinfo; | |
11dc1f36 SH |
155 | struct net_device *dev; |
156 | struct net_bridge_port *p; | |
157 | u8 new_state; | |
158 | ||
74685962 TG |
159 | if (nlmsg_len(nlh) < sizeof(*ifm)) |
160 | return -EINVAL; | |
161 | ||
162 | ifm = nlmsg_data(nlh); | |
11dc1f36 SH |
163 | if (ifm->ifi_family != AF_BRIDGE) |
164 | return -EPFNOSUPPORT; | |
165 | ||
74685962 TG |
166 | protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO); |
167 | if (!protinfo || nla_len(protinfo) < sizeof(u8)) | |
11dc1f36 SH |
168 | return -EINVAL; |
169 | ||
74685962 | 170 | new_state = nla_get_u8(protinfo); |
11dc1f36 SH |
171 | if (new_state > BR_STATE_BLOCKING) |
172 | return -EINVAL; | |
173 | ||
4aa678ba | 174 | dev = __dev_get_by_index(net, ifm->ifi_index); |
11dc1f36 SH |
175 | if (!dev) |
176 | return -ENODEV; | |
177 | ||
ec1e5610 | 178 | p = br_port_get_rtnl(dev); |
b5ed54e9 | 179 | if (!p) |
180 | return -EINVAL; | |
11dc1f36 SH |
181 | |
182 | /* if kernel STP is running, don't allow changes */ | |
9cde0708 | 183 | if (p->br->stp_enabled == BR_KERNEL_STP) |
11dc1f36 SH |
184 | return -EBUSY; |
185 | ||
74685962 TG |
186 | if (!netif_running(dev) || |
187 | (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED)) | |
11dc1f36 SH |
188 | return -ENETDOWN; |
189 | ||
190 | p->state = new_state; | |
191 | br_log_state(p); | |
b03b6dd5 VD |
192 | |
193 | spin_lock_bh(&p->br->lock); | |
194 | br_port_state_selection(p->br); | |
195 | spin_unlock_bh(&p->br->lock); | |
196 | ||
4ecb961c | 197 | br_ifinfo_notify(RTM_NEWLINK, p); |
198 | ||
11dc1f36 SH |
199 | return 0; |
200 | } | |
201 | ||
bb900b27 | 202 | static int br_validate(struct nlattr *tb[], struct nlattr *data[]) |
203 | { | |
204 | if (tb[IFLA_ADDRESS]) { | |
205 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
206 | return -EINVAL; | |
207 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
208 | return -EADDRNOTAVAIL; | |
209 | } | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | static struct rtnl_link_ops br_link_ops __read_mostly = { | |
215 | .kind = "bridge", | |
216 | .priv_size = sizeof(struct net_bridge), | |
217 | .setup = br_dev_setup, | |
218 | .validate = br_validate, | |
1ce5cce8 | 219 | .dellink = br_dev_delete, |
bb900b27 | 220 | }; |
11dc1f36 | 221 | |
32fe21c0 | 222 | int __init br_netlink_init(void) |
11dc1f36 | 223 | { |
bb900b27 | 224 | int err; |
36fd2b63 | 225 | |
bb900b27 | 226 | err = rtnl_link_register(&br_link_ops); |
227 | if (err < 0) | |
228 | goto err1; | |
229 | ||
c7ac8679 GR |
230 | err = __rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, |
231 | br_dump_ifinfo, NULL); | |
bb900b27 | 232 | if (err) |
233 | goto err2; | |
c7ac8679 GR |
234 | err = __rtnl_register(PF_BRIDGE, RTM_SETLINK, |
235 | br_rtm_setlink, NULL, NULL); | |
bb900b27 | 236 | if (err) |
237 | goto err3; | |
c7ac8679 GR |
238 | err = __rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, |
239 | br_fdb_add, NULL, NULL); | |
bb900b27 | 240 | if (err) |
241 | goto err3; | |
c7ac8679 GR |
242 | err = __rtnl_register(PF_BRIDGE, RTM_DELNEIGH, |
243 | br_fdb_delete, NULL, NULL); | |
bb900b27 | 244 | if (err) |
245 | goto err3; | |
c7ac8679 GR |
246 | err = __rtnl_register(PF_BRIDGE, RTM_GETNEIGH, |
247 | NULL, br_fdb_dump, NULL); | |
bb900b27 | 248 | if (err) |
249 | goto err3; | |
32fe21c0 TG |
250 | |
251 | return 0; | |
bb900b27 | 252 | |
253 | err3: | |
254 | rtnl_unregister_all(PF_BRIDGE); | |
255 | err2: | |
256 | rtnl_link_unregister(&br_link_ops); | |
257 | err1: | |
258 | return err; | |
11dc1f36 SH |
259 | } |
260 | ||
261 | void __exit br_netlink_fini(void) | |
262 | { | |
bb900b27 | 263 | rtnl_link_unregister(&br_link_ops); |
32fe21c0 | 264 | rtnl_unregister_all(PF_BRIDGE); |
11dc1f36 | 265 | } |