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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> | |
14 | #include <linux/rtnetlink.h> | |
280a306c | 15 | #include <net/netlink.h> |
11dc1f36 SH |
16 | #include "br_private.h" |
17 | ||
18 | /* | |
19 | * Create one netlink message for one interface | |
20 | * Contains port and master info as well as carrier and bridge state. | |
21 | */ | |
22 | static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port, | |
23 | u32 pid, u32 seq, int event, unsigned int flags) | |
24 | { | |
25 | const struct net_bridge *br = port->br; | |
26 | const struct net_device *dev = port->dev; | |
27 | struct ifinfomsg *r; | |
28 | struct nlmsghdr *nlh; | |
29 | unsigned char *b = skb->tail; | |
30 | u32 mtu = dev->mtu; | |
31 | u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; | |
32 | u8 portstate = port->state; | |
33 | ||
34 | pr_debug("br_fill_info event %d port %s master %s\n", | |
35 | event, dev->name, br->dev->name); | |
36 | ||
37 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); | |
38 | r = NLMSG_DATA(nlh); | |
39 | r->ifi_family = AF_BRIDGE; | |
40 | r->__ifi_pad = 0; | |
41 | r->ifi_type = dev->type; | |
42 | r->ifi_index = dev->ifindex; | |
43 | r->ifi_flags = dev_get_flags(dev); | |
44 | r->ifi_change = 0; | |
45 | ||
46 | RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name); | |
47 | ||
48 | RTA_PUT(skb, IFLA_MASTER, sizeof(int), &br->dev->ifindex); | |
49 | ||
50 | if (dev->addr_len) | |
51 | RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); | |
52 | ||
53 | RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu); | |
54 | if (dev->ifindex != dev->iflink) | |
55 | RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink); | |
56 | ||
57 | ||
58 | RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate); | |
59 | ||
60 | if (event == RTM_NEWLINK) | |
61 | RTA_PUT(skb, IFLA_PROTINFO, sizeof(portstate), &portstate); | |
62 | ||
63 | nlh->nlmsg_len = skb->tail - b; | |
64 | ||
65 | return skb->len; | |
66 | ||
67 | nlmsg_failure: | |
68 | rtattr_failure: | |
69 | ||
70 | skb_trim(skb, b - skb->data); | |
71 | return -EINVAL; | |
72 | } | |
73 | ||
74 | /* | |
75 | * Notify listeners of a change in port information | |
76 | */ | |
77 | void br_ifinfo_notify(int event, struct net_bridge_port *port) | |
78 | { | |
79 | struct sk_buff *skb; | |
280a306c TG |
80 | int payload = sizeof(struct ifinfomsg) + 128; |
81 | int err = -ENOBUFS; | |
11dc1f36 SH |
82 | |
83 | pr_debug("bridge notify event=%d\n", event); | |
280a306c TG |
84 | skb = nlmsg_new(nlmsg_total_size(payload), GFP_ATOMIC); |
85 | if (skb == NULL) | |
86 | goto errout; | |
87 | ||
88 | err = br_fill_ifinfo(skb, port, 0, 0, event, 0); | |
89 | if (err < 0) { | |
90 | kfree_skb(skb); | |
91 | goto errout; | |
92 | } | |
93 | ||
94 | err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); | |
95 | errout: | |
bea1b42e | 96 | if (err < 0) |
280a306c | 97 | rtnl_set_sk_err(RTNLGRP_LINK, err); |
11dc1f36 SH |
98 | } |
99 | ||
100 | /* | |
101 | * Dump information about all ports, in response to GETLINK | |
102 | */ | |
103 | static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) | |
104 | { | |
105 | struct net_device *dev; | |
106 | int idx; | |
107 | int s_idx = cb->args[0]; | |
108 | int err = 0; | |
109 | ||
110 | read_lock(&dev_base_lock); | |
111 | for (dev = dev_base, idx = 0; dev; dev = dev->next) { | |
112 | struct net_bridge_port *p = dev->br_port; | |
113 | ||
114 | /* not a bridge port */ | |
115 | if (!p) | |
116 | continue; | |
117 | ||
118 | if (idx < s_idx) | |
69ee20a5 | 119 | goto cont; |
11dc1f36 SH |
120 | |
121 | err = br_fill_ifinfo(skb, p, NETLINK_CB(cb->skb).pid, | |
122 | cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); | |
123 | if (err <= 0) | |
124 | break; | |
69ee20a5 | 125 | cont: |
11dc1f36 SH |
126 | ++idx; |
127 | } | |
128 | read_unlock(&dev_base_lock); | |
129 | ||
130 | cb->args[0] = idx; | |
131 | ||
132 | return skb->len; | |
133 | } | |
134 | ||
135 | /* | |
136 | * Change state of port (ie from forwarding to blocking etc) | |
137 | * Used by spanning tree in user space. | |
138 | */ | |
139 | static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
140 | { | |
141 | struct rtattr **rta = arg; | |
142 | struct ifinfomsg *ifm = NLMSG_DATA(nlh); | |
143 | struct net_device *dev; | |
144 | struct net_bridge_port *p; | |
145 | u8 new_state; | |
146 | ||
147 | if (ifm->ifi_family != AF_BRIDGE) | |
148 | return -EPFNOSUPPORT; | |
149 | ||
150 | /* Must pass valid state as PROTINFO */ | |
151 | if (rta[IFLA_PROTINFO-1]) { | |
152 | u8 *pstate = RTA_DATA(rta[IFLA_PROTINFO-1]); | |
153 | new_state = *pstate; | |
154 | } else | |
155 | return -EINVAL; | |
156 | ||
157 | if (new_state > BR_STATE_BLOCKING) | |
158 | return -EINVAL; | |
159 | ||
160 | /* Find bridge port */ | |
161 | dev = __dev_get_by_index(ifm->ifi_index); | |
162 | if (!dev) | |
163 | return -ENODEV; | |
164 | ||
165 | p = dev->br_port; | |
166 | if (!p) | |
167 | return -EINVAL; | |
168 | ||
169 | /* if kernel STP is running, don't allow changes */ | |
170 | if (p->br->stp_enabled) | |
171 | return -EBUSY; | |
172 | ||
173 | if (!netif_running(dev)) | |
174 | return -ENETDOWN; | |
175 | ||
176 | if (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED) | |
177 | return -ENETDOWN; | |
178 | ||
179 | p->state = new_state; | |
180 | br_log_state(p); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | ||
185 | static struct rtnetlink_link bridge_rtnetlink_table[RTM_NR_MSGTYPES] = { | |
186 | [RTM_GETLINK - RTM_BASE] = { .dumpit = br_dump_ifinfo, }, | |
187 | [RTM_SETLINK - RTM_BASE] = { .doit = br_rtm_setlink, }, | |
188 | }; | |
189 | ||
190 | void __init br_netlink_init(void) | |
191 | { | |
192 | rtnetlink_links[PF_BRIDGE] = bridge_rtnetlink_table; | |
193 | } | |
194 | ||
195 | void __exit br_netlink_fini(void) | |
196 | { | |
197 | rtnetlink_links[PF_BRIDGE] = NULL; | |
198 | } | |
199 |