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Commit | Line | Data |
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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> |
32fe21c0 | 15 | #include <net/rtnetlink.h> |
881d966b | 16 | #include <net/net_namespace.h> |
b854272b | 17 | #include <net/sock.h> |
11dc1f36 SH |
18 | #include "br_private.h" |
19 | ||
339bf98f TG |
20 | static inline size_t br_nlmsg_size(void) |
21 | { | |
22 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) | |
23 | + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ | |
24 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ | |
25 | + nla_total_size(4) /* IFLA_MASTER */ | |
26 | + nla_total_size(4) /* IFLA_MTU */ | |
27 | + nla_total_size(4) /* IFLA_LINK */ | |
28 | + nla_total_size(1) /* IFLA_OPERSTATE */ | |
29 | + nla_total_size(1); /* IFLA_PROTINFO */ | |
30 | } | |
31 | ||
11dc1f36 SH |
32 | /* |
33 | * Create one netlink message for one interface | |
34 | * Contains port and master info as well as carrier and bridge state. | |
35 | */ | |
36 | static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port, | |
37 | u32 pid, u32 seq, int event, unsigned int flags) | |
38 | { | |
39 | const struct net_bridge *br = port->br; | |
40 | const struct net_device *dev = port->dev; | |
74685962 | 41 | struct ifinfomsg *hdr; |
11dc1f36 | 42 | struct nlmsghdr *nlh; |
11dc1f36 | 43 | u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; |
11dc1f36 | 44 | |
28a16c97 | 45 | br_debug(br, "br_fill_info event %d port %s master %s\n", |
46 | event, dev->name, br->dev->name); | |
11dc1f36 | 47 | |
74685962 TG |
48 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); |
49 | if (nlh == NULL) | |
26932566 | 50 | return -EMSGSIZE; |
11dc1f36 | 51 | |
74685962 TG |
52 | hdr = nlmsg_data(nlh); |
53 | hdr->ifi_family = AF_BRIDGE; | |
54 | hdr->__ifi_pad = 0; | |
55 | hdr->ifi_type = dev->type; | |
56 | hdr->ifi_index = dev->ifindex; | |
57 | hdr->ifi_flags = dev_get_flags(dev); | |
58 | hdr->ifi_change = 0; | |
11dc1f36 | 59 | |
74685962 TG |
60 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); |
61 | NLA_PUT_U32(skb, IFLA_MASTER, br->dev->ifindex); | |
62 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); | |
63 | NLA_PUT_U8(skb, IFLA_OPERSTATE, operstate); | |
11dc1f36 SH |
64 | |
65 | if (dev->addr_len) | |
74685962 | 66 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
11dc1f36 | 67 | |
11dc1f36 | 68 | if (dev->ifindex != dev->iflink) |
74685962 | 69 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); |
11dc1f36 SH |
70 | |
71 | if (event == RTM_NEWLINK) | |
74685962 | 72 | NLA_PUT_U8(skb, IFLA_PROTINFO, port->state); |
11dc1f36 | 73 | |
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", |
91 | (unsigned)port->port_no, port->dev->name, event); | |
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 | */ | |
114 | static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) | |
115 | { | |
3b1e0a65 | 116 | struct net *net = sock_net(skb->sk); |
11dc1f36 SH |
117 | struct net_device *dev; |
118 | int idx; | |
11dc1f36 | 119 | |
7562f876 | 120 | idx = 0; |
4aa678ba | 121 | for_each_netdev(net, dev) { |
11dc1f36 | 122 | /* not a bridge port */ |
f350a0a8 | 123 | if (!br_port_exists(dev) || idx < cb->args[0]) |
74685962 | 124 | goto skip; |
11dc1f36 | 125 | |
f350a0a8 JP |
126 | if (br_fill_ifinfo(skb, br_port_get(dev), |
127 | NETLINK_CB(cb->skb).pid, | |
74685962 TG |
128 | cb->nlh->nlmsg_seq, RTM_NEWLINK, |
129 | NLM_F_MULTI) < 0) | |
11dc1f36 | 130 | break; |
74685962 | 131 | skip: |
11dc1f36 SH |
132 | ++idx; |
133 | } | |
11dc1f36 SH |
134 | |
135 | cb->args[0] = idx; | |
136 | ||
137 | return skb->len; | |
138 | } | |
139 | ||
140 | /* | |
141 | * Change state of port (ie from forwarding to blocking etc) | |
142 | * Used by spanning tree in user space. | |
143 | */ | |
144 | static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
145 | { | |
3b1e0a65 | 146 | struct net *net = sock_net(skb->sk); |
74685962 TG |
147 | struct ifinfomsg *ifm; |
148 | struct nlattr *protinfo; | |
11dc1f36 SH |
149 | struct net_device *dev; |
150 | struct net_bridge_port *p; | |
151 | u8 new_state; | |
152 | ||
74685962 TG |
153 | if (nlmsg_len(nlh) < sizeof(*ifm)) |
154 | return -EINVAL; | |
155 | ||
156 | ifm = nlmsg_data(nlh); | |
11dc1f36 SH |
157 | if (ifm->ifi_family != AF_BRIDGE) |
158 | return -EPFNOSUPPORT; | |
159 | ||
74685962 TG |
160 | protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO); |
161 | if (!protinfo || nla_len(protinfo) < sizeof(u8)) | |
11dc1f36 SH |
162 | return -EINVAL; |
163 | ||
74685962 | 164 | new_state = nla_get_u8(protinfo); |
11dc1f36 SH |
165 | if (new_state > BR_STATE_BLOCKING) |
166 | return -EINVAL; | |
167 | ||
4aa678ba | 168 | dev = __dev_get_by_index(net, ifm->ifi_index); |
11dc1f36 SH |
169 | if (!dev) |
170 | return -ENODEV; | |
171 | ||
f350a0a8 | 172 | if (!br_port_exists(dev)) |
11dc1f36 | 173 | return -EINVAL; |
f350a0a8 | 174 | p = br_port_get(dev); |
11dc1f36 SH |
175 | |
176 | /* if kernel STP is running, don't allow changes */ | |
9cde0708 | 177 | if (p->br->stp_enabled == BR_KERNEL_STP) |
11dc1f36 SH |
178 | return -EBUSY; |
179 | ||
74685962 TG |
180 | if (!netif_running(dev) || |
181 | (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED)) | |
11dc1f36 SH |
182 | return -ENETDOWN; |
183 | ||
184 | p->state = new_state; | |
185 | br_log_state(p); | |
186 | return 0; | |
187 | } | |
188 | ||
189 | ||
32fe21c0 | 190 | int __init br_netlink_init(void) |
11dc1f36 | 191 | { |
32fe21c0 TG |
192 | if (__rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, br_dump_ifinfo)) |
193 | return -ENOBUFS; | |
194 | ||
195 | /* Only the first call to __rtnl_register can fail */ | |
196 | __rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL); | |
197 | ||
198 | return 0; | |
11dc1f36 SH |
199 | } |
200 | ||
201 | void __exit br_netlink_fini(void) | |
202 | { | |
32fe21c0 | 203 | rtnl_unregister_all(PF_BRIDGE); |
11dc1f36 SH |
204 | } |
205 |