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