1 /*
2  * Copyright (c) 2012 Mellanox Technologies. -  All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32 
33 #include <linux/netdevice.h>
34 #include <linux/module.h>
35 #include <net/rtnetlink.h>
36 #include "ipoib.h"
37 
38 static const struct nla_policy ipoib_policy[IFLA_IPOIB_MAX + 1] = {
39 	[IFLA_IPOIB_PKEY]	= { .type = NLA_U16 },
40 	[IFLA_IPOIB_MODE]	= { .type = NLA_U16 },
41 	[IFLA_IPOIB_UMCAST]	= { .type = NLA_U16 },
42 };
43 
44 static int ipoib_fill_info(struct sk_buff *skb, const struct net_device *dev)
45 {
46 	struct ipoib_dev_priv *priv = netdev_priv(dev);
47 	u16 val;
48 
49 	if (nla_put_u16(skb, IFLA_IPOIB_PKEY, priv->pkey))
50 		goto nla_put_failure;
51 
52 	val = test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
53 	if (nla_put_u16(skb, IFLA_IPOIB_MODE, val))
54 		goto nla_put_failure;
55 
56 	val = test_bit(IPOIB_FLAG_UMCAST, &priv->flags);
57 	if (nla_put_u16(skb, IFLA_IPOIB_UMCAST, val))
58 		goto nla_put_failure;
59 
60 	return 0;
61 
62 nla_put_failure:
63 	return -EMSGSIZE;
64 }
65 
66 static int ipoib_changelink(struct net_device *dev,
67 			    struct nlattr *tb[], struct nlattr *data[])
68 {
69 	u16 mode, umcast;
70 	int ret = 0;
71 
72 	if (data[IFLA_IPOIB_MODE]) {
73 		mode  = nla_get_u16(data[IFLA_IPOIB_MODE]);
74 		if (mode == IPOIB_MODE_DATAGRAM)
75 			ret = ipoib_set_mode(dev, "datagram\n");
76 		else if (mode == IPOIB_MODE_CONNECTED)
77 			ret = ipoib_set_mode(dev, "connected\n");
78 		else
79 			ret = -EINVAL;
80 
81 		if (ret < 0)
82 			goto out_err;
83 	}
84 
85 	if (data[IFLA_IPOIB_UMCAST]) {
86 		umcast = nla_get_u16(data[IFLA_IPOIB_UMCAST]);
87 		ipoib_set_umcast(dev, umcast);
88 	}
89 
90 out_err:
91 	return ret;
92 }
93 
94 static int ipoib_new_child_link(struct net *src_net, struct net_device *dev,
95 			       struct nlattr *tb[], struct nlattr *data[])
96 {
97 	struct net_device *pdev;
98 	struct ipoib_dev_priv *ppriv;
99 	u16 child_pkey;
100 	int err;
101 
102 	if (!tb[IFLA_LINK])
103 		return -EINVAL;
104 
105 	pdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
106 	if (!pdev)
107 		return -ENODEV;
108 
109 	ppriv = netdev_priv(pdev);
110 
111 	if (test_bit(IPOIB_FLAG_SUBINTERFACE, &ppriv->flags)) {
112 		ipoib_warn(ppriv, "child creation disallowed for child devices\n");
113 		return -EINVAL;
114 	}
115 
116 	if (!data || !data[IFLA_IPOIB_PKEY]) {
117 		ipoib_dbg(ppriv, "no pkey specified, using parent pkey\n");
118 		child_pkey  = ppriv->pkey;
119 	} else
120 		child_pkey  = nla_get_u16(data[IFLA_IPOIB_PKEY]);
121 
122 	if (child_pkey == 0 || child_pkey == 0x8000)
123 		return -EINVAL;
124 
125 	/*
126 	 * Set the full membership bit, so that we join the right
127 	 * broadcast group, etc.
128 	 */
129 	child_pkey |= 0x8000;
130 
131 	err = __ipoib_vlan_add(ppriv, netdev_priv(dev), child_pkey, IPOIB_RTNL_CHILD);
132 
133 	if (!err && data)
134 		err = ipoib_changelink(dev, tb, data);
135 	return err;
136 }
137 
138 static void ipoib_unregister_child_dev(struct net_device *dev, struct list_head *head)
139 {
140 	struct ipoib_dev_priv *priv, *ppriv;
141 
142 	priv = netdev_priv(dev);
143 	ppriv = netdev_priv(priv->parent);
144 
145 	mutex_lock(&ppriv->vlan_mutex);
146 	unregister_netdevice_queue(dev, head);
147 	list_del(&priv->list);
148 	mutex_unlock(&ppriv->vlan_mutex);
149 }
150 
151 static size_t ipoib_get_size(const struct net_device *dev)
152 {
153 	return nla_total_size(2) +	/* IFLA_IPOIB_PKEY   */
154 		nla_total_size(2) +	/* IFLA_IPOIB_MODE   */
155 		nla_total_size(2);	/* IFLA_IPOIB_UMCAST */
156 }
157 
158 static struct rtnl_link_ops ipoib_link_ops __read_mostly = {
159 	.kind		= "ipoib",
160 	.maxtype	= IFLA_IPOIB_MAX,
161 	.policy		= ipoib_policy,
162 	.priv_size	= sizeof(struct ipoib_dev_priv),
163 	.setup		= ipoib_setup,
164 	.newlink	= ipoib_new_child_link,
165 	.changelink	= ipoib_changelink,
166 	.dellink	= ipoib_unregister_child_dev,
167 	.get_size	= ipoib_get_size,
168 	.fill_info	= ipoib_fill_info,
169 };
170 
171 int __init ipoib_netlink_init(void)
172 {
173 	return rtnl_link_register(&ipoib_link_ops);
174 }
175 
176 void __exit ipoib_netlink_fini(void)
177 {
178 	rtnl_link_unregister(&ipoib_link_ops);
179 }
180 
181 MODULE_ALIAS_RTNL_LINK("ipoib");
182