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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> |
14 | #include <net/rtnetlink.h> |
15 | #include <net/net_namespace.h> |
16 | #include <net/sock.h> |
17 | #include "br_private.h" |
18 | |
19 | static inline size_t br_nlmsg_size(void) |
20 | { |
21 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) |
22 | + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ |
23 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ |
24 | + nla_total_size(4) /* IFLA_MASTER */ |
25 | + nla_total_size(4) /* IFLA_MTU */ |
26 | + nla_total_size(4) /* IFLA_LINK */ |
27 | + nla_total_size(1) /* IFLA_OPERSTATE */ |
28 | + nla_total_size(1); /* IFLA_PROTINFO */ |
29 | } |
30 | |
31 | /* |
32 | * Create one netlink message for one interface |
33 | * Contains port and master info as well as carrier and bridge state. |
34 | */ |
35 | static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port, |
36 | u32 pid, u32 seq, int event, unsigned int flags) |
37 | { |
38 | const struct net_bridge *br = port->br; |
39 | const struct net_device *dev = port->dev; |
40 | struct ifinfomsg *hdr; |
41 | struct nlmsghdr *nlh; |
42 | u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; |
43 | |
44 | pr_debug("br_fill_info event %d port %s master %s\n", |
45 | event, dev->name, br->dev->name); |
46 | |
47 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); |
48 | if (nlh == NULL) |
49 | return -EMSGSIZE; |
50 | |
51 | hdr = nlmsg_data(nlh); |
52 | hdr->ifi_family = AF_BRIDGE; |
53 | hdr->__ifi_pad = 0; |
54 | hdr->ifi_type = dev->type; |
55 | hdr->ifi_index = dev->ifindex; |
56 | hdr->ifi_flags = dev_get_flags(dev); |
57 | hdr->ifi_change = 0; |
58 | |
59 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); |
60 | NLA_PUT_U32(skb, IFLA_MASTER, br->dev->ifindex); |
61 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); |
62 | NLA_PUT_U8(skb, IFLA_OPERSTATE, operstate); |
63 | |
64 | if (dev->addr_len) |
65 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
66 | |
67 | if (dev->ifindex != dev->iflink) |
68 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); |
69 | |
70 | if (event == RTM_NEWLINK) |
71 | NLA_PUT_U8(skb, IFLA_PROTINFO, port->state); |
72 | |
73 | return nlmsg_end(skb, nlh); |
74 | |
75 | nla_put_failure: |
76 | nlmsg_cancel(skb, nlh); |
77 | return -EMSGSIZE; |
78 | } |
79 | |
80 | /* |
81 | * Notify listeners of a change in port information |
82 | */ |
83 | void br_ifinfo_notify(int event, struct net_bridge_port *port) |
84 | { |
85 | struct net *net = dev_net(port->dev); |
86 | struct sk_buff *skb; |
87 | int err = -ENOBUFS; |
88 | |
89 | pr_debug("bridge notify event=%d\n", event); |
90 | skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC); |
91 | if (skb == NULL) |
92 | goto errout; |
93 | |
94 | err = br_fill_ifinfo(skb, port, 0, 0, event, 0); |
95 | if (err < 0) { |
96 | /* -EMSGSIZE implies BUG in br_nlmsg_size() */ |
97 | WARN_ON(err == -EMSGSIZE); |
98 | kfree_skb(skb); |
99 | goto errout; |
100 | } |
101 | rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); |
102 | return; |
103 | errout: |
104 | if (err < 0) |
105 | rtnl_set_sk_err(net, RTNLGRP_LINK, err); |
106 | } |
107 | |
108 | /* |
109 | * Dump information about all ports, in response to GETLINK |
110 | */ |
111 | static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) |
112 | { |
113 | struct net *net = sock_net(skb->sk); |
114 | struct net_device *dev; |
115 | int idx; |
116 | |
117 | idx = 0; |
118 | for_each_netdev(net, dev) { |
119 | /* not a bridge port */ |
120 | if (dev->br_port == NULL || idx < cb->args[0]) |
121 | goto skip; |
122 | |
123 | if (br_fill_ifinfo(skb, dev->br_port, NETLINK_CB(cb->skb).pid, |
124 | cb->nlh->nlmsg_seq, RTM_NEWLINK, |
125 | NLM_F_MULTI) < 0) |
126 | break; |
127 | skip: |
128 | ++idx; |
129 | } |
130 | |
131 | cb->args[0] = idx; |
132 | |
133 | return skb->len; |
134 | } |
135 | |
136 | /* |
137 | * Change state of port (ie from forwarding to blocking etc) |
138 | * Used by spanning tree in user space. |
139 | */ |
140 | static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
141 | { |
142 | struct net *net = sock_net(skb->sk); |
143 | struct ifinfomsg *ifm; |
144 | struct nlattr *protinfo; |
145 | struct net_device *dev; |
146 | struct net_bridge_port *p; |
147 | u8 new_state; |
148 | |
149 | if (nlmsg_len(nlh) < sizeof(*ifm)) |
150 | return -EINVAL; |
151 | |
152 | ifm = nlmsg_data(nlh); |
153 | if (ifm->ifi_family != AF_BRIDGE) |
154 | return -EPFNOSUPPORT; |
155 | |
156 | protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO); |
157 | if (!protinfo || nla_len(protinfo) < sizeof(u8)) |
158 | return -EINVAL; |
159 | |
160 | new_state = nla_get_u8(protinfo); |
161 | if (new_state > BR_STATE_BLOCKING) |
162 | return -EINVAL; |
163 | |
164 | dev = __dev_get_by_index(net, ifm->ifi_index); |
165 | if (!dev) |
166 | return -ENODEV; |
167 | |
168 | p = dev->br_port; |
169 | if (!p) |
170 | return -EINVAL; |
171 | |
172 | /* if kernel STP is running, don't allow changes */ |
173 | if (p->br->stp_enabled == BR_KERNEL_STP) |
174 | return -EBUSY; |
175 | |
176 | if (!netif_running(dev) || |
177 | (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED)) |
178 | return -ENETDOWN; |
179 | |
180 | p->state = new_state; |
181 | br_log_state(p); |
182 | return 0; |
183 | } |
184 | |
185 | |
186 | int __init br_netlink_init(void) |
187 | { |
188 | if (__rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, br_dump_ifinfo)) |
189 | return -ENOBUFS; |
190 | |
191 | /* Only the first call to __rtnl_register can fail */ |
192 | __rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL); |
193 | |
194 | return 0; |
195 | } |
196 | |
197 | void __exit br_netlink_fini(void) |
198 | { |
199 | rtnl_unregister_all(PF_BRIDGE); |
200 | } |
201 | |
202 |
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