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 | |
25c71c75 | 23 | static inline size_t br_port_info_size(void) |
24 | { | |
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 */ | |
a2e01a65 | 29 | + nla_total_size(1) /* IFLA_BRPORT_GUARD */ |
1007dd1a | 30 | + nla_total_size(1) /* IFLA_BRPORT_PROTECT */ |
25c71c75 | 31 | + 0; |
32 | } | |
33 | ||
339bf98f TG |
34 | static inline size_t br_nlmsg_size(void) |
35 | { | |
36 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) | |
25c71c75 | 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 */ | |
44 | } | |
45 | ||
46 | static int br_port_fill_attrs(struct sk_buff *skb, | |
47 | const struct net_bridge_port *p) | |
48 | { | |
49 | u8 mode = !!(p->flags & BR_HAIRPIN_MODE); | |
50 | ||
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) || | |
a2e01a65 | 54 | nla_put_u8(skb, IFLA_BRPORT_MODE, mode) || |
1007dd1a | 55 | nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) || |
c2d3babf DM |
56 | nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) || |
57 | nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE))) | |
25c71c75 | 58 | return -EMSGSIZE; |
59 | ||
60 | return 0; | |
339bf98f TG |
61 | } |
62 | ||
11dc1f36 SH |
63 | /* |
64 | * Create one netlink message for one interface | |
65 | * Contains port and master info as well as carrier and bridge state. | |
66 | */ | |
67 | static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port, | |
68 | u32 pid, u32 seq, int event, unsigned int flags) | |
69 | { | |
70 | const struct net_bridge *br = port->br; | |
71 | const struct net_device *dev = port->dev; | |
74685962 | 72 | struct ifinfomsg *hdr; |
11dc1f36 | 73 | struct nlmsghdr *nlh; |
11dc1f36 | 74 | u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; |
11dc1f36 | 75 | |
28a16c97 | 76 | br_debug(br, "br_fill_info event %d port %s master %s\n", |
77 | event, dev->name, br->dev->name); | |
11dc1f36 | 78 | |
74685962 TG |
79 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); |
80 | if (nlh == NULL) | |
26932566 | 81 | return -EMSGSIZE; |
11dc1f36 | 82 | |
74685962 TG |
83 | hdr = nlmsg_data(nlh); |
84 | hdr->ifi_family = AF_BRIDGE; | |
85 | hdr->__ifi_pad = 0; | |
86 | hdr->ifi_type = dev->type; | |
87 | hdr->ifi_index = dev->ifindex; | |
88 | hdr->ifi_flags = dev_get_flags(dev); | |
89 | hdr->ifi_change = 0; | |
11dc1f36 | 90 | |
2eb812e6 DM |
91 | if (nla_put_string(skb, IFLA_IFNAME, dev->name) || |
92 | nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) || | |
93 | nla_put_u32(skb, IFLA_MTU, dev->mtu) || | |
94 | nla_put_u8(skb, IFLA_OPERSTATE, operstate) || | |
95 | (dev->addr_len && | |
96 | nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || | |
97 | (dev->ifindex != dev->iflink && | |
25c71c75 | 98 | nla_put_u32(skb, IFLA_LINK, dev->iflink))) |
2eb812e6 | 99 | goto nla_put_failure; |
25c71c75 | 100 | |
101 | if (event == RTM_NEWLINK) { | |
102 | struct nlattr *nest | |
103 | = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); | |
104 | ||
105 | if (nest == NULL || br_port_fill_attrs(skb, port) < 0) | |
106 | goto nla_put_failure; | |
107 | nla_nest_end(skb, nest); | |
108 | } | |
109 | ||
74685962 | 110 | return nlmsg_end(skb, nlh); |
11dc1f36 | 111 | |
74685962 | 112 | nla_put_failure: |
26932566 PM |
113 | nlmsg_cancel(skb, nlh); |
114 | return -EMSGSIZE; | |
11dc1f36 SH |
115 | } |
116 | ||
117 | /* | |
118 | * Notify listeners of a change in port information | |
119 | */ | |
120 | void br_ifinfo_notify(int event, struct net_bridge_port *port) | |
121 | { | |
4aa678ba | 122 | struct net *net = dev_net(port->dev); |
11dc1f36 | 123 | struct sk_buff *skb; |
280a306c | 124 | int err = -ENOBUFS; |
11dc1f36 | 125 | |
28a16c97 | 126 | br_debug(port->br, "port %u(%s) event %d\n", |
95c96174 | 127 | (unsigned int)port->port_no, port->dev->name, event); |
28a16c97 | 128 | |
339bf98f | 129 | skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC); |
280a306c TG |
130 | if (skb == NULL) |
131 | goto errout; | |
132 | ||
133 | err = br_fill_ifinfo(skb, port, 0, 0, event, 0); | |
26932566 PM |
134 | if (err < 0) { |
135 | /* -EMSGSIZE implies BUG in br_nlmsg_size() */ | |
136 | WARN_ON(err == -EMSGSIZE); | |
137 | kfree_skb(skb); | |
138 | goto errout; | |
139 | } | |
1ce85fe4 PNA |
140 | rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); |
141 | return; | |
280a306c | 142 | errout: |
bea1b42e | 143 | if (err < 0) |
4aa678ba | 144 | rtnl_set_sk_err(net, RTNLGRP_LINK, err); |
11dc1f36 SH |
145 | } |
146 | ||
147 | /* | |
148 | * Dump information about all ports, in response to GETLINK | |
149 | */ | |
e5a55a89 JF |
150 | int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, |
151 | struct net_device *dev) | |
11dc1f36 | 152 | { |
e5a55a89 JF |
153 | int err = 0; |
154 | struct net_bridge_port *port = br_port_get_rcu(dev); | |
155 | ||
156 | /* not a bridge port */ | |
157 | if (!port) | |
158 | goto out; | |
11dc1f36 | 159 | |
e5a55a89 JF |
160 | err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI); |
161 | out: | |
162 | return err; | |
11dc1f36 SH |
163 | } |
164 | ||
25c71c75 | 165 | static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = { |
166 | [IFLA_BRPORT_STATE] = { .type = NLA_U8 }, | |
167 | [IFLA_BRPORT_COST] = { .type = NLA_U32 }, | |
168 | [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 }, | |
169 | [IFLA_BRPORT_MODE] = { .type = NLA_U8 }, | |
a2e01a65 | 170 | [IFLA_BRPORT_GUARD] = { .type = NLA_U8 }, |
1007dd1a | 171 | [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 }, |
25c71c75 | 172 | }; |
173 | ||
174 | /* Change the state of the port and notify spanning tree */ | |
175 | static int br_set_port_state(struct net_bridge_port *p, u8 state) | |
176 | { | |
177 | if (state > BR_STATE_BLOCKING) | |
178 | return -EINVAL; | |
179 | ||
180 | /* if kernel STP is running, don't allow changes */ | |
181 | if (p->br->stp_enabled == BR_KERNEL_STP) | |
182 | return -EBUSY; | |
183 | ||
576eb625 | 184 | /* if device is not up, change is not allowed |
185 | * if link is not present, only allowable state is disabled | |
186 | */ | |
25c71c75 | 187 | if (!netif_running(p->dev) || |
576eb625 | 188 | (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED)) |
25c71c75 | 189 | return -ENETDOWN; |
190 | ||
191 | p->state = state; | |
192 | br_log_state(p); | |
193 | br_port_state_selection(p->br); | |
194 | return 0; | |
195 | } | |
196 | ||
197 | /* Set/clear or port flags based on attribute */ | |
198 | static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[], | |
199 | int attrtype, unsigned long mask) | |
200 | { | |
201 | if (tb[attrtype]) { | |
202 | u8 flag = nla_get_u8(tb[attrtype]); | |
203 | if (flag) | |
204 | p->flags |= mask; | |
205 | else | |
206 | p->flags &= ~mask; | |
207 | } | |
208 | } | |
209 | ||
210 | /* Process bridge protocol info on port */ | |
211 | static int br_setport(struct net_bridge_port *p, struct nlattr *tb[]) | |
212 | { | |
213 | int err; | |
214 | ||
215 | br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE); | |
a2e01a65 | 216 | br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD); |
c2d3babf | 217 | br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE); |
25c71c75 | 218 | |
219 | if (tb[IFLA_BRPORT_COST]) { | |
220 | err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST])); | |
221 | if (err) | |
222 | return err; | |
223 | } | |
224 | ||
225 | if (tb[IFLA_BRPORT_PRIORITY]) { | |
226 | err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY])); | |
227 | if (err) | |
228 | return err; | |
229 | } | |
230 | ||
231 | if (tb[IFLA_BRPORT_STATE]) { | |
232 | err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE])); | |
233 | if (err) | |
234 | return err; | |
235 | } | |
236 | return 0; | |
237 | } | |
238 | ||
239 | /* Change state and parameters on port. */ | |
e5a55a89 | 240 | int br_setlink(struct net_device *dev, struct nlmsghdr *nlh) |
11dc1f36 | 241 | { |
74685962 TG |
242 | struct ifinfomsg *ifm; |
243 | struct nlattr *protinfo; | |
11dc1f36 | 244 | struct net_bridge_port *p; |
2062cc20 | 245 | struct nlattr *tb[IFLA_BRPORT_MAX + 1]; |
25c71c75 | 246 | int err; |
11dc1f36 | 247 | |
74685962 | 248 | ifm = nlmsg_data(nlh); |
11dc1f36 | 249 | |
74685962 | 250 | protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO); |
25c71c75 | 251 | if (!protinfo) |
252 | return 0; | |
11dc1f36 | 253 | |
ec1e5610 | 254 | p = br_port_get_rtnl(dev); |
b5ed54e9 | 255 | if (!p) |
256 | return -EINVAL; | |
11dc1f36 | 257 | |
25c71c75 | 258 | if (protinfo->nla_type & NLA_F_NESTED) { |
259 | err = nla_parse_nested(tb, IFLA_BRPORT_MAX, | |
260 | protinfo, ifla_brport_policy); | |
261 | if (err) | |
262 | return err; | |
11dc1f36 | 263 | |
25c71c75 | 264 | spin_lock_bh(&p->br->lock); |
265 | err = br_setport(p, tb); | |
266 | spin_unlock_bh(&p->br->lock); | |
267 | } else { | |
268 | /* Binary compatability with old RSTP */ | |
269 | if (nla_len(protinfo) < sizeof(u8)) | |
270 | return -EINVAL; | |
11dc1f36 | 271 | |
25c71c75 | 272 | spin_lock_bh(&p->br->lock); |
273 | err = br_set_port_state(p, nla_get_u8(protinfo)); | |
274 | spin_unlock_bh(&p->br->lock); | |
275 | } | |
b03b6dd5 | 276 | |
25c71c75 | 277 | if (err == 0) |
278 | br_ifinfo_notify(RTM_NEWLINK, p); | |
b03b6dd5 | 279 | |
25c71c75 | 280 | return err; |
11dc1f36 SH |
281 | } |
282 | ||
bb900b27 | 283 | static int br_validate(struct nlattr *tb[], struct nlattr *data[]) |
284 | { | |
285 | if (tb[IFLA_ADDRESS]) { | |
286 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
287 | return -EINVAL; | |
288 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
289 | return -EADDRNOTAVAIL; | |
290 | } | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
149ddd83 | 295 | struct rtnl_link_ops br_link_ops __read_mostly = { |
bb900b27 | 296 | .kind = "bridge", |
297 | .priv_size = sizeof(struct net_bridge), | |
298 | .setup = br_dev_setup, | |
299 | .validate = br_validate, | |
1ce5cce8 | 300 | .dellink = br_dev_delete, |
bb900b27 | 301 | }; |
11dc1f36 | 302 | |
32fe21c0 | 303 | int __init br_netlink_init(void) |
11dc1f36 | 304 | { |
3ec8e9f0 VY |
305 | int err; |
306 | ||
307 | br_mdb_init(); | |
308 | err = rtnl_link_register(&br_link_ops); | |
309 | if (err) | |
310 | goto out; | |
311 | ||
312 | return 0; | |
313 | out: | |
314 | br_mdb_uninit(); | |
315 | return err; | |
11dc1f36 SH |
316 | } |
317 | ||
318 | void __exit br_netlink_fini(void) | |
319 | { | |
3ec8e9f0 | 320 | br_mdb_uninit(); |
bb900b27 | 321 | rtnl_link_unregister(&br_link_ops); |
11dc1f36 | 322 | } |