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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> | |
32fe21c0 | 14 | #include <net/rtnetlink.h> |
11dc1f36 SH |
15 | #include "br_private.h" |
16 | ||
339bf98f TG |
17 | static inline size_t br_nlmsg_size(void) |
18 | { | |
19 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) | |
20 | + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ | |
21 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ | |
22 | + nla_total_size(4) /* IFLA_MASTER */ | |
23 | + nla_total_size(4) /* IFLA_MTU */ | |
24 | + nla_total_size(4) /* IFLA_LINK */ | |
25 | + nla_total_size(1) /* IFLA_OPERSTATE */ | |
26 | + nla_total_size(1); /* IFLA_PROTINFO */ | |
27 | } | |
28 | ||
11dc1f36 SH |
29 | /* |
30 | * Create one netlink message for one interface | |
31 | * Contains port and master info as well as carrier and bridge state. | |
32 | */ | |
33 | static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port, | |
34 | u32 pid, u32 seq, int event, unsigned int flags) | |
35 | { | |
36 | const struct net_bridge *br = port->br; | |
37 | const struct net_device *dev = port->dev; | |
74685962 | 38 | struct ifinfomsg *hdr; |
11dc1f36 | 39 | struct nlmsghdr *nlh; |
11dc1f36 | 40 | u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; |
11dc1f36 SH |
41 | |
42 | pr_debug("br_fill_info event %d port %s master %s\n", | |
43 | event, dev->name, br->dev->name); | |
44 | ||
74685962 TG |
45 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); |
46 | if (nlh == NULL) | |
26932566 | 47 | return -EMSGSIZE; |
11dc1f36 | 48 | |
74685962 TG |
49 | hdr = nlmsg_data(nlh); |
50 | hdr->ifi_family = AF_BRIDGE; | |
51 | hdr->__ifi_pad = 0; | |
52 | hdr->ifi_type = dev->type; | |
53 | hdr->ifi_index = dev->ifindex; | |
54 | hdr->ifi_flags = dev_get_flags(dev); | |
55 | hdr->ifi_change = 0; | |
11dc1f36 | 56 | |
74685962 TG |
57 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); |
58 | NLA_PUT_U32(skb, IFLA_MASTER, br->dev->ifindex); | |
59 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); | |
60 | NLA_PUT_U8(skb, IFLA_OPERSTATE, operstate); | |
11dc1f36 SH |
61 | |
62 | if (dev->addr_len) | |
74685962 | 63 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
11dc1f36 | 64 | |
11dc1f36 | 65 | if (dev->ifindex != dev->iflink) |
74685962 | 66 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); |
11dc1f36 SH |
67 | |
68 | if (event == RTM_NEWLINK) | |
74685962 | 69 | NLA_PUT_U8(skb, IFLA_PROTINFO, port->state); |
11dc1f36 | 70 | |
74685962 | 71 | return nlmsg_end(skb, nlh); |
11dc1f36 | 72 | |
74685962 | 73 | nla_put_failure: |
26932566 PM |
74 | nlmsg_cancel(skb, nlh); |
75 | return -EMSGSIZE; | |
11dc1f36 SH |
76 | } |
77 | ||
78 | /* | |
79 | * Notify listeners of a change in port information | |
80 | */ | |
81 | void br_ifinfo_notify(int event, struct net_bridge_port *port) | |
82 | { | |
83 | struct sk_buff *skb; | |
280a306c | 84 | int err = -ENOBUFS; |
11dc1f36 SH |
85 | |
86 | pr_debug("bridge notify event=%d\n", event); | |
339bf98f | 87 | skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC); |
280a306c TG |
88 | if (skb == NULL) |
89 | goto errout; | |
90 | ||
91 | err = br_fill_ifinfo(skb, port, 0, 0, event, 0); | |
26932566 PM |
92 | if (err < 0) { |
93 | /* -EMSGSIZE implies BUG in br_nlmsg_size() */ | |
94 | WARN_ON(err == -EMSGSIZE); | |
95 | kfree_skb(skb); | |
96 | goto errout; | |
97 | } | |
280a306c TG |
98 | err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); |
99 | errout: | |
bea1b42e | 100 | if (err < 0) |
280a306c | 101 | rtnl_set_sk_err(RTNLGRP_LINK, err); |
11dc1f36 SH |
102 | } |
103 | ||
104 | /* | |
105 | * Dump information about all ports, in response to GETLINK | |
106 | */ | |
107 | static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) | |
108 | { | |
109 | struct net_device *dev; | |
110 | int idx; | |
11dc1f36 | 111 | |
7562f876 PE |
112 | idx = 0; |
113 | for_each_netdev(dev) { | |
11dc1f36 | 114 | /* not a bridge port */ |
74685962 TG |
115 | if (dev->br_port == NULL || idx < cb->args[0]) |
116 | goto skip; | |
11dc1f36 | 117 | |
74685962 TG |
118 | if (br_fill_ifinfo(skb, dev->br_port, NETLINK_CB(cb->skb).pid, |
119 | cb->nlh->nlmsg_seq, RTM_NEWLINK, | |
120 | NLM_F_MULTI) < 0) | |
11dc1f36 | 121 | break; |
74685962 | 122 | skip: |
11dc1f36 SH |
123 | ++idx; |
124 | } | |
11dc1f36 SH |
125 | |
126 | cb->args[0] = idx; | |
127 | ||
128 | return skb->len; | |
129 | } | |
130 | ||
131 | /* | |
132 | * Change state of port (ie from forwarding to blocking etc) | |
133 | * Used by spanning tree in user space. | |
134 | */ | |
135 | static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
136 | { | |
74685962 TG |
137 | struct ifinfomsg *ifm; |
138 | struct nlattr *protinfo; | |
11dc1f36 SH |
139 | struct net_device *dev; |
140 | struct net_bridge_port *p; | |
141 | u8 new_state; | |
142 | ||
74685962 TG |
143 | if (nlmsg_len(nlh) < sizeof(*ifm)) |
144 | return -EINVAL; | |
145 | ||
146 | ifm = nlmsg_data(nlh); | |
11dc1f36 SH |
147 | if (ifm->ifi_family != AF_BRIDGE) |
148 | return -EPFNOSUPPORT; | |
149 | ||
74685962 TG |
150 | protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO); |
151 | if (!protinfo || nla_len(protinfo) < sizeof(u8)) | |
11dc1f36 SH |
152 | return -EINVAL; |
153 | ||
74685962 | 154 | new_state = nla_get_u8(protinfo); |
11dc1f36 SH |
155 | if (new_state > BR_STATE_BLOCKING) |
156 | return -EINVAL; | |
157 | ||
11dc1f36 SH |
158 | dev = __dev_get_by_index(ifm->ifi_index); |
159 | if (!dev) | |
160 | return -ENODEV; | |
161 | ||
162 | p = dev->br_port; | |
163 | if (!p) | |
164 | return -EINVAL; | |
165 | ||
166 | /* if kernel STP is running, don't allow changes */ | |
9cde0708 | 167 | if (p->br->stp_enabled == BR_KERNEL_STP) |
11dc1f36 SH |
168 | return -EBUSY; |
169 | ||
74685962 TG |
170 | if (!netif_running(dev) || |
171 | (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED)) | |
11dc1f36 SH |
172 | return -ENETDOWN; |
173 | ||
174 | p->state = new_state; | |
175 | br_log_state(p); | |
176 | return 0; | |
177 | } | |
178 | ||
179 | ||
32fe21c0 | 180 | int __init br_netlink_init(void) |
11dc1f36 | 181 | { |
32fe21c0 TG |
182 | if (__rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, br_dump_ifinfo)) |
183 | return -ENOBUFS; | |
184 | ||
185 | /* Only the first call to __rtnl_register can fail */ | |
186 | __rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL); | |
187 | ||
188 | return 0; | |
11dc1f36 SH |
189 | } |
190 | ||
191 | void __exit br_netlink_fini(void) | |
192 | { | |
32fe21c0 | 193 | rtnl_unregister_all(PF_BRIDGE); |
11dc1f36 SH |
194 | } |
195 |