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 | |
2eb812e6 DM |
63 | if (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) || | |
67 | (dev->addr_len && | |
68 | nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || | |
69 | (dev->ifindex != dev->iflink && | |
70 | nla_put_u32(skb, IFLA_LINK, dev->iflink)) || | |
71 | (event == RTM_NEWLINK && | |
72 | nla_put_u8(skb, IFLA_PROTINFO, port->state))) | |
73 | goto nla_put_failure; | |
74685962 | 74 | return nlmsg_end(skb, nlh); |
11dc1f36 | 75 | |
74685962 | 76 | nla_put_failure: |
26932566 PM |
77 | nlmsg_cancel(skb, nlh); |
78 | return -EMSGSIZE; | |
11dc1f36 SH |
79 | } |
80 | ||
81 | /* | |
82 | * Notify listeners of a change in port information | |
83 | */ | |
84 | void br_ifinfo_notify(int event, struct net_bridge_port *port) | |
85 | { | |
4aa678ba | 86 | struct net *net = dev_net(port->dev); |
11dc1f36 | 87 | struct sk_buff *skb; |
280a306c | 88 | int err = -ENOBUFS; |
11dc1f36 | 89 | |
28a16c97 | 90 | br_debug(port->br, "port %u(%s) event %d\n", |
95c96174 | 91 | (unsigned int)port->port_no, port->dev->name, event); |
28a16c97 | 92 | |
339bf98f | 93 | skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC); |
280a306c TG |
94 | if (skb == NULL) |
95 | goto errout; | |
96 | ||
97 | err = br_fill_ifinfo(skb, port, 0, 0, event, 0); | |
26932566 PM |
98 | if (err < 0) { |
99 | /* -EMSGSIZE implies BUG in br_nlmsg_size() */ | |
100 | WARN_ON(err == -EMSGSIZE); | |
101 | kfree_skb(skb); | |
102 | goto errout; | |
103 | } | |
1ce85fe4 PNA |
104 | rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); |
105 | return; | |
280a306c | 106 | errout: |
bea1b42e | 107 | if (err < 0) |
4aa678ba | 108 | rtnl_set_sk_err(net, RTNLGRP_LINK, err); |
11dc1f36 SH |
109 | } |
110 | ||
111 | /* | |
112 | * Dump information about all ports, in response to GETLINK | |
113 | */ | |
e5a55a89 JF |
114 | int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, |
115 | struct net_device *dev) | |
11dc1f36 | 116 | { |
e5a55a89 JF |
117 | int err = 0; |
118 | struct net_bridge_port *port = br_port_get_rcu(dev); | |
119 | ||
120 | /* not a bridge port */ | |
121 | if (!port) | |
122 | goto out; | |
11dc1f36 | 123 | |
e5a55a89 JF |
124 | err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI); |
125 | out: | |
126 | return err; | |
11dc1f36 SH |
127 | } |
128 | ||
129 | /* | |
130 | * Change state of port (ie from forwarding to blocking etc) | |
131 | * Used by spanning tree in user space. | |
132 | */ | |
e5a55a89 | 133 | int br_setlink(struct net_device *dev, struct nlmsghdr *nlh) |
11dc1f36 | 134 | { |
74685962 TG |
135 | struct ifinfomsg *ifm; |
136 | struct nlattr *protinfo; | |
11dc1f36 SH |
137 | struct net_bridge_port *p; |
138 | u8 new_state; | |
139 | ||
74685962 | 140 | ifm = nlmsg_data(nlh); |
11dc1f36 | 141 | |
74685962 TG |
142 | protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO); |
143 | if (!protinfo || nla_len(protinfo) < sizeof(u8)) | |
11dc1f36 SH |
144 | return -EINVAL; |
145 | ||
74685962 | 146 | new_state = nla_get_u8(protinfo); |
11dc1f36 SH |
147 | if (new_state > BR_STATE_BLOCKING) |
148 | return -EINVAL; | |
149 | ||
ec1e5610 | 150 | p = br_port_get_rtnl(dev); |
b5ed54e9 | 151 | if (!p) |
152 | return -EINVAL; | |
11dc1f36 SH |
153 | |
154 | /* if kernel STP is running, don't allow changes */ | |
9cde0708 | 155 | if (p->br->stp_enabled == BR_KERNEL_STP) |
11dc1f36 SH |
156 | return -EBUSY; |
157 | ||
74685962 TG |
158 | if (!netif_running(dev) || |
159 | (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED)) | |
11dc1f36 SH |
160 | return -ENETDOWN; |
161 | ||
162 | p->state = new_state; | |
163 | br_log_state(p); | |
b03b6dd5 VD |
164 | |
165 | spin_lock_bh(&p->br->lock); | |
166 | br_port_state_selection(p->br); | |
167 | spin_unlock_bh(&p->br->lock); | |
168 | ||
11dc1f36 SH |
169 | return 0; |
170 | } | |
171 | ||
bb900b27 | 172 | static int br_validate(struct nlattr *tb[], struct nlattr *data[]) |
173 | { | |
174 | if (tb[IFLA_ADDRESS]) { | |
175 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
176 | return -EINVAL; | |
177 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
178 | return -EADDRNOTAVAIL; | |
179 | } | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
149ddd83 | 184 | struct rtnl_link_ops br_link_ops __read_mostly = { |
bb900b27 | 185 | .kind = "bridge", |
186 | .priv_size = sizeof(struct net_bridge), | |
187 | .setup = br_dev_setup, | |
188 | .validate = br_validate, | |
1ce5cce8 | 189 | .dellink = br_dev_delete, |
bb900b27 | 190 | }; |
11dc1f36 | 191 | |
32fe21c0 | 192 | int __init br_netlink_init(void) |
11dc1f36 | 193 | { |
e5a55a89 | 194 | return rtnl_link_register(&br_link_ops); |
11dc1f36 SH |
195 | } |
196 | ||
197 | void __exit br_netlink_fini(void) | |
198 | { | |
bb900b27 | 199 | rtnl_link_unregister(&br_link_ops); |
32fe21c0 | 200 | rtnl_unregister_all(PF_BRIDGE); |
11dc1f36 | 201 | } |