]>
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> | |
14 | #include <linux/rtnetlink.h> | |
280a306c | 15 | #include <net/netlink.h> |
11dc1f36 SH |
16 | #include "br_private.h" |
17 | ||
339bf98f TG |
18 | static inline size_t br_nlmsg_size(void) |
19 | { | |
20 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) | |
21 | + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ | |
22 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ | |
23 | + nla_total_size(4) /* IFLA_MASTER */ | |
24 | + nla_total_size(4) /* IFLA_MTU */ | |
25 | + nla_total_size(4) /* IFLA_LINK */ | |
26 | + nla_total_size(1) /* IFLA_OPERSTATE */ | |
27 | + nla_total_size(1); /* IFLA_PROTINFO */ | |
28 | } | |
29 | ||
11dc1f36 SH |
30 | /* |
31 | * Create one netlink message for one interface | |
32 | * Contains port and master info as well as carrier and bridge state. | |
33 | */ | |
34 | static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port, | |
35 | u32 pid, u32 seq, int event, unsigned int flags) | |
36 | { | |
37 | const struct net_bridge *br = port->br; | |
38 | const struct net_device *dev = port->dev; | |
74685962 | 39 | struct ifinfomsg *hdr; |
11dc1f36 | 40 | struct nlmsghdr *nlh; |
11dc1f36 | 41 | u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; |
11dc1f36 SH |
42 | |
43 | pr_debug("br_fill_info event %d port %s master %s\n", | |
44 | event, dev->name, br->dev->name); | |
45 | ||
74685962 TG |
46 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); |
47 | if (nlh == NULL) | |
26932566 | 48 | return -EMSGSIZE; |
11dc1f36 | 49 | |
74685962 TG |
50 | hdr = nlmsg_data(nlh); |
51 | hdr->ifi_family = AF_BRIDGE; | |
52 | hdr->__ifi_pad = 0; | |
53 | hdr->ifi_type = dev->type; | |
54 | hdr->ifi_index = dev->ifindex; | |
55 | hdr->ifi_flags = dev_get_flags(dev); | |
56 | hdr->ifi_change = 0; | |
11dc1f36 | 57 | |
74685962 TG |
58 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); |
59 | NLA_PUT_U32(skb, IFLA_MASTER, br->dev->ifindex); | |
60 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); | |
61 | NLA_PUT_U8(skb, IFLA_OPERSTATE, operstate); | |
11dc1f36 SH |
62 | |
63 | if (dev->addr_len) | |
74685962 | 64 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
11dc1f36 | 65 | |
11dc1f36 | 66 | if (dev->ifindex != dev->iflink) |
74685962 | 67 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); |
11dc1f36 SH |
68 | |
69 | if (event == RTM_NEWLINK) | |
74685962 | 70 | NLA_PUT_U8(skb, IFLA_PROTINFO, port->state); |
11dc1f36 | 71 | |
74685962 | 72 | return nlmsg_end(skb, nlh); |
11dc1f36 | 73 | |
74685962 | 74 | nla_put_failure: |
26932566 PM |
75 | nlmsg_cancel(skb, nlh); |
76 | return -EMSGSIZE; | |
11dc1f36 SH |
77 | } |
78 | ||
79 | /* | |
80 | * Notify listeners of a change in port information | |
81 | */ | |
82 | void br_ifinfo_notify(int event, struct net_bridge_port *port) | |
83 | { | |
84 | struct sk_buff *skb; | |
280a306c | 85 | int err = -ENOBUFS; |
11dc1f36 SH |
86 | |
87 | pr_debug("bridge notify event=%d\n", event); | |
339bf98f | 88 | skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC); |
280a306c TG |
89 | if (skb == NULL) |
90 | goto errout; | |
91 | ||
92 | err = br_fill_ifinfo(skb, port, 0, 0, event, 0); | |
26932566 PM |
93 | if (err < 0) { |
94 | /* -EMSGSIZE implies BUG in br_nlmsg_size() */ | |
95 | WARN_ON(err == -EMSGSIZE); | |
96 | kfree_skb(skb); | |
97 | goto errout; | |
98 | } | |
280a306c TG |
99 | err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); |
100 | errout: | |
bea1b42e | 101 | if (err < 0) |
280a306c | 102 | rtnl_set_sk_err(RTNLGRP_LINK, err); |
11dc1f36 SH |
103 | } |
104 | ||
105 | /* | |
106 | * Dump information about all ports, in response to GETLINK | |
107 | */ | |
108 | static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) | |
109 | { | |
110 | struct net_device *dev; | |
111 | int idx; | |
11dc1f36 SH |
112 | |
113 | read_lock(&dev_base_lock); | |
114 | for (dev = dev_base, idx = 0; dev; dev = dev->next) { | |
11dc1f36 | 115 | /* not a bridge port */ |
74685962 TG |
116 | if (dev->br_port == NULL || idx < cb->args[0]) |
117 | goto skip; | |
11dc1f36 | 118 | |
74685962 TG |
119 | if (br_fill_ifinfo(skb, dev->br_port, NETLINK_CB(cb->skb).pid, |
120 | cb->nlh->nlmsg_seq, RTM_NEWLINK, | |
121 | NLM_F_MULTI) < 0) | |
11dc1f36 | 122 | break; |
74685962 | 123 | skip: |
11dc1f36 SH |
124 | ++idx; |
125 | } | |
126 | read_unlock(&dev_base_lock); | |
127 | ||
128 | cb->args[0] = idx; | |
129 | ||
130 | return skb->len; | |
131 | } | |
132 | ||
133 | /* | |
134 | * Change state of port (ie from forwarding to blocking etc) | |
135 | * Used by spanning tree in user space. | |
136 | */ | |
137 | static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
138 | { | |
74685962 TG |
139 | struct ifinfomsg *ifm; |
140 | struct nlattr *protinfo; | |
11dc1f36 SH |
141 | struct net_device *dev; |
142 | struct net_bridge_port *p; | |
143 | u8 new_state; | |
144 | ||
74685962 TG |
145 | if (nlmsg_len(nlh) < sizeof(*ifm)) |
146 | return -EINVAL; | |
147 | ||
148 | ifm = nlmsg_data(nlh); | |
11dc1f36 SH |
149 | if (ifm->ifi_family != AF_BRIDGE) |
150 | return -EPFNOSUPPORT; | |
151 | ||
74685962 TG |
152 | protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO); |
153 | if (!protinfo || nla_len(protinfo) < sizeof(u8)) | |
11dc1f36 SH |
154 | return -EINVAL; |
155 | ||
74685962 | 156 | new_state = nla_get_u8(protinfo); |
11dc1f36 SH |
157 | if (new_state > BR_STATE_BLOCKING) |
158 | return -EINVAL; | |
159 | ||
11dc1f36 SH |
160 | dev = __dev_get_by_index(ifm->ifi_index); |
161 | if (!dev) | |
162 | return -ENODEV; | |
163 | ||
164 | p = dev->br_port; | |
165 | if (!p) | |
166 | return -EINVAL; | |
167 | ||
168 | /* if kernel STP is running, don't allow changes */ | |
169 | if (p->br->stp_enabled) | |
170 | return -EBUSY; | |
171 | ||
74685962 TG |
172 | if (!netif_running(dev) || |
173 | (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED)) | |
11dc1f36 SH |
174 | return -ENETDOWN; |
175 | ||
176 | p->state = new_state; | |
177 | br_log_state(p); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | ||
182 | static struct rtnetlink_link bridge_rtnetlink_table[RTM_NR_MSGTYPES] = { | |
183 | [RTM_GETLINK - RTM_BASE] = { .dumpit = br_dump_ifinfo, }, | |
184 | [RTM_SETLINK - RTM_BASE] = { .doit = br_rtm_setlink, }, | |
185 | }; | |
186 | ||
187 | void __init br_netlink_init(void) | |
188 | { | |
189 | rtnetlink_links[PF_BRIDGE] = bridge_rtnetlink_table; | |
190 | } | |
191 | ||
192 | void __exit br_netlink_fini(void) | |
193 | { | |
194 | rtnetlink_links[PF_BRIDGE] = NULL; | |
195 | } | |
196 |