GNU Linux-libre 6.6.31-gnu
[releases.git] / net / dsa / netlink.c
1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright 2022 NXP
3  */
4 #include <linux/netdevice.h>
5 #include <net/rtnetlink.h>
6
7 #include "netlink.h"
8 #include "slave.h"
9
10 static const struct nla_policy dsa_policy[IFLA_DSA_MAX + 1] = {
11         [IFLA_DSA_MASTER]       = { .type = NLA_U32 },
12 };
13
14 static int dsa_changelink(struct net_device *dev, struct nlattr *tb[],
15                           struct nlattr *data[],
16                           struct netlink_ext_ack *extack)
17 {
18         int err;
19
20         if (!data)
21                 return 0;
22
23         if (data[IFLA_DSA_MASTER]) {
24                 u32 ifindex = nla_get_u32(data[IFLA_DSA_MASTER]);
25                 struct net_device *master;
26
27                 master = __dev_get_by_index(dev_net(dev), ifindex);
28                 if (!master)
29                         return -EINVAL;
30
31                 err = dsa_slave_change_master(dev, master, extack);
32                 if (err)
33                         return err;
34         }
35
36         return 0;
37 }
38
39 static size_t dsa_get_size(const struct net_device *dev)
40 {
41         return nla_total_size(sizeof(u32)) +    /* IFLA_DSA_MASTER  */
42                0;
43 }
44
45 static int dsa_fill_info(struct sk_buff *skb, const struct net_device *dev)
46 {
47         struct net_device *master = dsa_slave_to_master(dev);
48
49         if (nla_put_u32(skb, IFLA_DSA_MASTER, master->ifindex))
50                 return -EMSGSIZE;
51
52         return 0;
53 }
54
55 struct rtnl_link_ops dsa_link_ops __read_mostly = {
56         .kind                   = "dsa",
57         .priv_size              = sizeof(struct dsa_port),
58         .maxtype                = IFLA_DSA_MAX,
59         .policy                 = dsa_policy,
60         .changelink             = dsa_changelink,
61         .get_size               = dsa_get_size,
62         .fill_info              = dsa_fill_info,
63         .netns_refund           = true,
64 };