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> | |
15 | #include "br_private.h" | |
16 | ||
17 | /* | |
18 | * Create one netlink message for one interface | |
19 | * Contains port and master info as well as carrier and bridge state. | |
20 | */ | |
21 | static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port, | |
22 | u32 pid, u32 seq, int event, unsigned int flags) | |
23 | { | |
24 | const struct net_bridge *br = port->br; | |
25 | const struct net_device *dev = port->dev; | |
26 | struct ifinfomsg *r; | |
27 | struct nlmsghdr *nlh; | |
28 | unsigned char *b = skb->tail; | |
29 | u32 mtu = dev->mtu; | |
30 | u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; | |
31 | u8 portstate = port->state; | |
32 | ||
33 | pr_debug("br_fill_info event %d port %s master %s\n", | |
34 | event, dev->name, br->dev->name); | |
35 | ||
36 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); | |
37 | r = NLMSG_DATA(nlh); | |
38 | r->ifi_family = AF_BRIDGE; | |
39 | r->__ifi_pad = 0; | |
40 | r->ifi_type = dev->type; | |
41 | r->ifi_index = dev->ifindex; | |
42 | r->ifi_flags = dev_get_flags(dev); | |
43 | r->ifi_change = 0; | |
44 | ||
45 | RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name); | |
46 | ||
47 | RTA_PUT(skb, IFLA_MASTER, sizeof(int), &br->dev->ifindex); | |
48 | ||
49 | if (dev->addr_len) | |
50 | RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); | |
51 | ||
52 | RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu); | |
53 | if (dev->ifindex != dev->iflink) | |
54 | RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink); | |
55 | ||
56 | ||
57 | RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate); | |
58 | ||
59 | if (event == RTM_NEWLINK) | |
60 | RTA_PUT(skb, IFLA_PROTINFO, sizeof(portstate), &portstate); | |
61 | ||
62 | nlh->nlmsg_len = skb->tail - b; | |
63 | ||
64 | return skb->len; | |
65 | ||
66 | nlmsg_failure: | |
67 | rtattr_failure: | |
68 | ||
69 | skb_trim(skb, b - skb->data); | |
70 | return -EINVAL; | |
71 | } | |
72 | ||
73 | /* | |
74 | * Notify listeners of a change in port information | |
75 | */ | |
76 | void br_ifinfo_notify(int event, struct net_bridge_port *port) | |
77 | { | |
78 | struct sk_buff *skb; | |
79 | int err = -ENOMEM; | |
80 | ||
81 | pr_debug("bridge notify event=%d\n", event); | |
82 | skb = alloc_skb(NLMSG_SPACE(sizeof(struct ifinfomsg) + 128), | |
83 | GFP_ATOMIC); | |
84 | if (!skb) | |
85 | goto err_out; | |
86 | ||
87 | err = br_fill_ifinfo(skb, port, current->pid, 0, event, 0); | |
88 | if (err) | |
89 | goto err_kfree; | |
90 | ||
91 | NETLINK_CB(skb).dst_group = RTNLGRP_LINK; | |
92 | netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_ATOMIC); | |
93 | return; | |
94 | ||
95 | err_kfree: | |
96 | kfree_skb(skb); | |
97 | err_out: | |
98 | netlink_set_err(rtnl, 0, RTNLGRP_LINK, err); | |
99 | } | |
100 | ||
101 | /* | |
102 | * Dump information about all ports, in response to GETLINK | |
103 | */ | |
104 | static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) | |
105 | { | |
106 | struct net_device *dev; | |
107 | int idx; | |
108 | int s_idx = cb->args[0]; | |
109 | int err = 0; | |
110 | ||
111 | read_lock(&dev_base_lock); | |
112 | for (dev = dev_base, idx = 0; dev; dev = dev->next) { | |
113 | struct net_bridge_port *p = dev->br_port; | |
114 | ||
115 | /* not a bridge port */ | |
116 | if (!p) | |
117 | continue; | |
118 | ||
119 | if (idx < s_idx) | |
69ee20a5 | 120 | goto cont; |
11dc1f36 SH |
121 | |
122 | err = br_fill_ifinfo(skb, p, NETLINK_CB(cb->skb).pid, | |
123 | cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); | |
124 | if (err <= 0) | |
125 | break; | |
69ee20a5 | 126 | cont: |
11dc1f36 SH |
127 | ++idx; |
128 | } | |
129 | read_unlock(&dev_base_lock); | |
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 rtattr **rta = arg; | |
143 | struct ifinfomsg *ifm = NLMSG_DATA(nlh); | |
144 | struct net_device *dev; | |
145 | struct net_bridge_port *p; | |
146 | u8 new_state; | |
147 | ||
148 | if (ifm->ifi_family != AF_BRIDGE) | |
149 | return -EPFNOSUPPORT; | |
150 | ||
151 | /* Must pass valid state as PROTINFO */ | |
152 | if (rta[IFLA_PROTINFO-1]) { | |
153 | u8 *pstate = RTA_DATA(rta[IFLA_PROTINFO-1]); | |
154 | new_state = *pstate; | |
155 | } else | |
156 | return -EINVAL; | |
157 | ||
158 | if (new_state > BR_STATE_BLOCKING) | |
159 | return -EINVAL; | |
160 | ||
161 | /* Find bridge port */ | |
162 | dev = __dev_get_by_index(ifm->ifi_index); | |
163 | if (!dev) | |
164 | return -ENODEV; | |
165 | ||
166 | p = dev->br_port; | |
167 | if (!p) | |
168 | return -EINVAL; | |
169 | ||
170 | /* if kernel STP is running, don't allow changes */ | |
171 | if (p->br->stp_enabled) | |
172 | return -EBUSY; | |
173 | ||
174 | if (!netif_running(dev)) | |
175 | return -ENETDOWN; | |
176 | ||
177 | if (!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 | static struct rtnetlink_link bridge_rtnetlink_table[RTM_NR_MSGTYPES] = { | |
187 | [RTM_GETLINK - RTM_BASE] = { .dumpit = br_dump_ifinfo, }, | |
188 | [RTM_SETLINK - RTM_BASE] = { .doit = br_rtm_setlink, }, | |
189 | }; | |
190 | ||
191 | void __init br_netlink_init(void) | |
192 | { | |
193 | rtnetlink_links[PF_BRIDGE] = bridge_rtnetlink_table; | |
194 | } | |
195 | ||
196 | void __exit br_netlink_fini(void) | |
197 | { | |
198 | rtnetlink_links[PF_BRIDGE] = NULL; | |
199 | } | |
200 |