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d3d854fd JK |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | ||
3 | #include <linux/netdevice.h> | |
4 | #include <linux/notifier.h> | |
5 | #include <linux/rtnetlink.h> | |
6 | #include <net/net_namespace.h> | |
7 | #include <net/sock.h> | |
8 | ||
9 | #include "netdev-genl-gen.h" | |
10 | ||
11 | static int | |
12 | netdev_nl_dev_fill(struct net_device *netdev, struct sk_buff *rsp, | |
13 | u32 portid, u32 seq, int flags, u32 cmd) | |
14 | { | |
15 | void *hdr; | |
16 | ||
17 | hdr = genlmsg_put(rsp, portid, seq, &netdev_nl_family, flags, cmd); | |
18 | if (!hdr) | |
19 | return -EMSGSIZE; | |
20 | ||
21 | if (nla_put_u32(rsp, NETDEV_A_DEV_IFINDEX, netdev->ifindex) || | |
22 | nla_put_u64_64bit(rsp, NETDEV_A_DEV_XDP_FEATURES, | |
23 | netdev->xdp_features, NETDEV_A_DEV_PAD)) { | |
24 | genlmsg_cancel(rsp, hdr); | |
25 | return -EINVAL; | |
26 | } | |
27 | ||
28 | genlmsg_end(rsp, hdr); | |
29 | ||
30 | return 0; | |
31 | } | |
32 | ||
33 | static void | |
34 | netdev_genl_dev_notify(struct net_device *netdev, int cmd) | |
35 | { | |
36 | struct sk_buff *ntf; | |
37 | ||
38 | if (!genl_has_listeners(&netdev_nl_family, dev_net(netdev), | |
39 | NETDEV_NLGRP_MGMT)) | |
40 | return; | |
41 | ||
42 | ntf = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
43 | if (!ntf) | |
44 | return; | |
45 | ||
46 | if (netdev_nl_dev_fill(netdev, ntf, 0, 0, 0, cmd)) { | |
47 | nlmsg_free(ntf); | |
48 | return; | |
49 | } | |
50 | ||
51 | genlmsg_multicast_netns(&netdev_nl_family, dev_net(netdev), ntf, | |
52 | 0, NETDEV_NLGRP_MGMT, GFP_KERNEL); | |
53 | } | |
54 | ||
55 | int netdev_nl_dev_get_doit(struct sk_buff *skb, struct genl_info *info) | |
56 | { | |
57 | struct net_device *netdev; | |
58 | struct sk_buff *rsp; | |
59 | u32 ifindex; | |
60 | int err; | |
61 | ||
62 | if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_DEV_IFINDEX)) | |
63 | return -EINVAL; | |
64 | ||
65 | ifindex = nla_get_u32(info->attrs[NETDEV_A_DEV_IFINDEX]); | |
66 | ||
67 | rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
68 | if (!rsp) | |
69 | return -ENOMEM; | |
70 | ||
71 | rtnl_lock(); | |
72 | ||
73 | netdev = __dev_get_by_index(genl_info_net(info), ifindex); | |
74 | if (netdev) | |
75 | err = netdev_nl_dev_fill(netdev, rsp, info->snd_portid, | |
76 | info->snd_seq, 0, info->genlhdr->cmd); | |
77 | else | |
78 | err = -ENODEV; | |
79 | ||
80 | rtnl_unlock(); | |
81 | ||
82 | if (err) | |
83 | goto err_free_msg; | |
84 | ||
85 | return genlmsg_reply(rsp, info); | |
86 | ||
87 | err_free_msg: | |
88 | nlmsg_free(rsp); | |
89 | return err; | |
90 | } | |
91 | ||
92 | int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb) | |
93 | { | |
94 | struct net *net = sock_net(skb->sk); | |
95 | struct net_device *netdev; | |
96 | int idx = 0, s_idx; | |
97 | int h, s_h; | |
98 | int err; | |
99 | ||
100 | s_h = cb->args[0]; | |
101 | s_idx = cb->args[1]; | |
102 | ||
103 | rtnl_lock(); | |
104 | ||
105 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
106 | struct hlist_head *head; | |
107 | ||
108 | idx = 0; | |
109 | head = &net->dev_index_head[h]; | |
110 | hlist_for_each_entry(netdev, head, index_hlist) { | |
111 | if (idx < s_idx) | |
112 | goto cont; | |
113 | err = netdev_nl_dev_fill(netdev, skb, | |
114 | NETLINK_CB(cb->skb).portid, | |
115 | cb->nlh->nlmsg_seq, 0, | |
116 | NETDEV_CMD_DEV_GET); | |
117 | if (err < 0) | |
118 | break; | |
119 | cont: | |
120 | idx++; | |
121 | } | |
122 | } | |
123 | ||
124 | rtnl_unlock(); | |
125 | ||
126 | if (err != -EMSGSIZE) | |
127 | return err; | |
128 | ||
129 | cb->args[1] = idx; | |
130 | cb->args[0] = h; | |
131 | cb->seq = net->dev_base_seq; | |
132 | ||
133 | return skb->len; | |
134 | } | |
135 | ||
136 | static int netdev_genl_netdevice_event(struct notifier_block *nb, | |
137 | unsigned long event, void *ptr) | |
138 | { | |
139 | struct net_device *netdev = netdev_notifier_info_to_dev(ptr); | |
140 | ||
141 | switch (event) { | |
142 | case NETDEV_REGISTER: | |
143 | netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_ADD_NTF); | |
144 | break; | |
145 | case NETDEV_UNREGISTER: | |
146 | netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_DEL_NTF); | |
147 | break; | |
148 | case NETDEV_XDP_FEAT_CHANGE: | |
149 | netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_CHANGE_NTF); | |
150 | break; | |
151 | } | |
152 | ||
153 | return NOTIFY_OK; | |
154 | } | |
155 | ||
156 | static struct notifier_block netdev_genl_nb = { | |
157 | .notifier_call = netdev_genl_netdevice_event, | |
158 | }; | |
159 | ||
160 | static int __init netdev_genl_init(void) | |
161 | { | |
162 | int err; | |
163 | ||
164 | err = register_netdevice_notifier(&netdev_genl_nb); | |
165 | if (err) | |
166 | return err; | |
167 | ||
168 | err = genl_register_family(&netdev_nl_family); | |
169 | if (err) | |
170 | goto err_unreg_ntf; | |
171 | ||
172 | return 0; | |
173 | ||
174 | err_unreg_ntf: | |
175 | unregister_netdevice_notifier(&netdev_genl_nb); | |
176 | return err; | |
177 | } | |
178 | ||
179 | subsys_initcall(netdev_genl_init); |