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/if_arp.h>      /* For ARPHRD_xxx */
35 #include <linux/module.h>
36 #include <net/rtnetlink.h>
37 #include "ipoib.h"
38 
39 static const struct nla_policy ipoib_policy[IFLA_IPOIB_MAX + 1] = {
40 	[IFLA_IPOIB_PKEY]	= { .type = NLA_U16 },
41 	[IFLA_IPOIB_MODE]	= { .type = NLA_U16 },
42 	[IFLA_IPOIB_UMCAST]	= { .type = NLA_U16 },
43 };
44 
45 static int ipoib_fill_info(struct sk_buff *skb, const struct net_device *dev)
46 {
47 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
48 	u16 val;
49 
50 	if (nla_put_u16(skb, IFLA_IPOIB_PKEY, priv->pkey))
51 		goto nla_put_failure;
52 
53 	val = test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
54 	if (nla_put_u16(skb, IFLA_IPOIB_MODE, val))
55 		goto nla_put_failure;
56 
57 	val = test_bit(IPOIB_FLAG_UMCAST, &priv->flags);
58 	if (nla_put_u16(skb, IFLA_IPOIB_UMCAST, val))
59 		goto nla_put_failure;
60 
61 	return 0;
62 
63 nla_put_failure:
64 	return -EMSGSIZE;
65 }
66 
67 static int ipoib_changelink(struct net_device *dev, struct nlattr *tb[],
68 			    struct nlattr *data[],
69 			    struct netlink_ext_ack *extack)
70 {
71 	u16 mode, umcast;
72 	int ret = 0;
73 
74 	if (data[IFLA_IPOIB_MODE]) {
75 		mode  = nla_get_u16(data[IFLA_IPOIB_MODE]);
76 		if (mode == IPOIB_MODE_DATAGRAM)
77 			ret = ipoib_set_mode(dev, "datagram\n");
78 		else if (mode == IPOIB_MODE_CONNECTED)
79 			ret = ipoib_set_mode(dev, "connected\n");
80 		else
81 			ret = -EINVAL;
82 
83 		if (ret < 0)
84 			goto out_err;
85 	}
86 
87 	if (data[IFLA_IPOIB_UMCAST]) {
88 		umcast = nla_get_u16(data[IFLA_IPOIB_UMCAST]);
89 		ipoib_set_umcast(dev, umcast);
90 	}
91 
92 out_err:
93 	return ret;
94 }
95 
96 static int ipoib_new_child_link(struct net *src_net, struct net_device *dev,
97 				struct nlattr *tb[], struct nlattr *data[],
98 				struct netlink_ext_ack *extack)
99 {
100 	struct net_device *pdev;
101 	struct ipoib_dev_priv *ppriv;
102 	u16 child_pkey;
103 	int err;
104 
105 	if (!tb[IFLA_LINK])
106 		return -EINVAL;
107 
108 	pdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
109 	if (!pdev || pdev->type != ARPHRD_INFINIBAND)
110 		return -ENODEV;
111 
112 	ppriv = ipoib_priv(pdev);
113 
114 	if (test_bit(IPOIB_FLAG_SUBINTERFACE, &ppriv->flags)) {
115 		ipoib_warn(ppriv, "child creation disallowed for child devices\n");
116 		return -EINVAL;
117 	}
118 
119 	if (!data || !data[IFLA_IPOIB_PKEY]) {
120 		ipoib_dbg(ppriv, "no pkey specified, using parent pkey\n");
121 		child_pkey  = ppriv->pkey;
122 	} else
123 		child_pkey  = nla_get_u16(data[IFLA_IPOIB_PKEY]);
124 
125 	if (child_pkey == 0 || child_pkey == 0x8000)
126 		return -EINVAL;
127 
128 	/*
129 	 * Set the full membership bit, so that we join the right
130 	 * broadcast group, etc.
131 	 */
132 	child_pkey |= 0x8000;
133 
134 	err = __ipoib_vlan_add(ppriv, ipoib_priv(dev),
135 			       child_pkey, IPOIB_RTNL_CHILD);
136 
137 	if (!err && data)
138 		err = ipoib_changelink(dev, tb, data, extack);
139 	return err;
140 }
141 
142 static void ipoib_unregister_child_dev(struct net_device *dev, struct list_head *head)
143 {
144 	struct ipoib_dev_priv *priv, *ppriv;
145 
146 	priv = ipoib_priv(dev);
147 	ppriv = ipoib_priv(priv->parent);
148 
149 	down_write(&ppriv->vlan_rwsem);
150 	unregister_netdevice_queue(dev, head);
151 	list_del(&priv->list);
152 	up_write(&ppriv->vlan_rwsem);
153 }
154 
155 static size_t ipoib_get_size(const struct net_device *dev)
156 {
157 	return nla_total_size(2) +	/* IFLA_IPOIB_PKEY   */
158 		nla_total_size(2) +	/* IFLA_IPOIB_MODE   */
159 		nla_total_size(2);	/* IFLA_IPOIB_UMCAST */
160 }
161 
162 static struct rtnl_link_ops ipoib_link_ops __read_mostly = {
163 	.kind		= "ipoib",
164 	.maxtype	= IFLA_IPOIB_MAX,
165 	.policy		= ipoib_policy,
166 	.priv_size	= sizeof(struct ipoib_dev_priv),
167 	.setup		= ipoib_setup_common,
168 	.newlink	= ipoib_new_child_link,
169 	.changelink	= ipoib_changelink,
170 	.dellink	= ipoib_unregister_child_dev,
171 	.get_size	= ipoib_get_size,
172 	.fill_info	= ipoib_fill_info,
173 };
174 
175 int __init ipoib_netlink_init(void)
176 {
177 	return rtnl_link_register(&ipoib_link_ops);
178 }
179 
180 void __exit ipoib_netlink_fini(void)
181 {
182 	rtnl_link_unregister(&ipoib_link_ops);
183 }
184 
185 MODULE_ALIAS_RTNL_LINK("ipoib");
186