xref: /linux/net/ethtool/wol.c (revision a1ff5a7d78a036d6c2178ee5acd6ba4946243800)
1 // SPDX-License-Identifier: GPL-2.0-only
2 
3 #include "netlink.h"
4 #include "common.h"
5 #include "bitset.h"
6 
7 struct wol_req_info {
8 	struct ethnl_req_info		base;
9 };
10 
11 struct wol_reply_data {
12 	struct ethnl_reply_data		base;
13 	struct ethtool_wolinfo		wol;
14 	bool				show_sopass;
15 };
16 
17 #define WOL_REPDATA(__reply_base) \
18 	container_of(__reply_base, struct wol_reply_data, base)
19 
20 const struct nla_policy ethnl_wol_get_policy[] = {
21 	[ETHTOOL_A_WOL_HEADER]		=
22 		NLA_POLICY_NESTED(ethnl_header_policy),
23 };
24 
wol_prepare_data(const struct ethnl_req_info * req_base,struct ethnl_reply_data * reply_base,const struct genl_info * info)25 static int wol_prepare_data(const struct ethnl_req_info *req_base,
26 			    struct ethnl_reply_data *reply_base,
27 			    const struct genl_info *info)
28 {
29 	struct wol_reply_data *data = WOL_REPDATA(reply_base);
30 	struct net_device *dev = reply_base->dev;
31 	int ret;
32 
33 	if (!dev->ethtool_ops->get_wol)
34 		return -EOPNOTSUPP;
35 
36 	ret = ethnl_ops_begin(dev);
37 	if (ret < 0)
38 		return ret;
39 	dev->ethtool_ops->get_wol(dev, &data->wol);
40 	ethnl_ops_complete(dev);
41 	/* do not include password in notifications */
42 	data->show_sopass = !genl_info_is_ntf(info) &&
43 		(data->wol.supported & WAKE_MAGICSECURE);
44 
45 	return 0;
46 }
47 
wol_reply_size(const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)48 static int wol_reply_size(const struct ethnl_req_info *req_base,
49 			  const struct ethnl_reply_data *reply_base)
50 {
51 	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
52 	const struct wol_reply_data *data = WOL_REPDATA(reply_base);
53 	int len;
54 
55 	len = ethnl_bitset32_size(&data->wol.wolopts, &data->wol.supported,
56 				  WOL_MODE_COUNT, wol_mode_names, compact);
57 	if (len < 0)
58 		return len;
59 	if (data->show_sopass)
60 		len += nla_total_size(sizeof(data->wol.sopass));
61 
62 	return len;
63 }
64 
wol_fill_reply(struct sk_buff * skb,const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)65 static int wol_fill_reply(struct sk_buff *skb,
66 			  const struct ethnl_req_info *req_base,
67 			  const struct ethnl_reply_data *reply_base)
68 {
69 	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
70 	const struct wol_reply_data *data = WOL_REPDATA(reply_base);
71 	int ret;
72 
73 	ret = ethnl_put_bitset32(skb, ETHTOOL_A_WOL_MODES, &data->wol.wolopts,
74 				 &data->wol.supported, WOL_MODE_COUNT,
75 				 wol_mode_names, compact);
76 	if (ret < 0)
77 		return ret;
78 	if (data->show_sopass &&
79 	    nla_put(skb, ETHTOOL_A_WOL_SOPASS, sizeof(data->wol.sopass),
80 		    data->wol.sopass))
81 		return -EMSGSIZE;
82 
83 	return 0;
84 }
85 
86 /* WOL_SET */
87 
88 const struct nla_policy ethnl_wol_set_policy[] = {
89 	[ETHTOOL_A_WOL_HEADER]		=
90 		NLA_POLICY_NESTED(ethnl_header_policy),
91 	[ETHTOOL_A_WOL_MODES]		= { .type = NLA_NESTED },
92 	[ETHTOOL_A_WOL_SOPASS]		= { .type = NLA_BINARY,
93 					    .len = SOPASS_MAX },
94 };
95 
96 static int
ethnl_set_wol_validate(struct ethnl_req_info * req_info,struct genl_info * info)97 ethnl_set_wol_validate(struct ethnl_req_info *req_info, struct genl_info *info)
98 {
99 	const struct ethtool_ops *ops = req_info->dev->ethtool_ops;
100 
101 	return ops->get_wol && ops->set_wol ? 1 : -EOPNOTSUPP;
102 }
103 
104 static int
ethnl_set_wol(struct ethnl_req_info * req_info,struct genl_info * info)105 ethnl_set_wol(struct ethnl_req_info *req_info, struct genl_info *info)
106 {
107 	struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
108 	struct net_device *dev = req_info->dev;
109 	struct nlattr **tb = info->attrs;
110 	bool mod = false;
111 	int ret;
112 
113 	dev->ethtool_ops->get_wol(dev, &wol);
114 	ret = ethnl_update_bitset32(&wol.wolopts, WOL_MODE_COUNT,
115 				    tb[ETHTOOL_A_WOL_MODES], wol_mode_names,
116 				    info->extack, &mod);
117 	if (ret < 0)
118 		return ret;
119 	if (wol.wolopts & ~wol.supported) {
120 		NL_SET_ERR_MSG_ATTR(info->extack, tb[ETHTOOL_A_WOL_MODES],
121 				    "cannot enable unsupported WoL mode");
122 		return -EINVAL;
123 	}
124 	if (tb[ETHTOOL_A_WOL_SOPASS]) {
125 		if (!(wol.supported & WAKE_MAGICSECURE)) {
126 			NL_SET_ERR_MSG_ATTR(info->extack,
127 					    tb[ETHTOOL_A_WOL_SOPASS],
128 					    "magicsecure not supported, cannot set password");
129 			return -EINVAL;
130 		}
131 		ethnl_update_binary(wol.sopass, sizeof(wol.sopass),
132 				    tb[ETHTOOL_A_WOL_SOPASS], &mod);
133 	}
134 
135 	if (!mod)
136 		return 0;
137 	ret = dev->ethtool_ops->set_wol(dev, &wol);
138 	if (ret)
139 		return ret;
140 	dev->ethtool->wol_enabled = !!wol.wolopts;
141 	return 1;
142 }
143 
144 const struct ethnl_request_ops ethnl_wol_request_ops = {
145 	.request_cmd		= ETHTOOL_MSG_WOL_GET,
146 	.reply_cmd		= ETHTOOL_MSG_WOL_GET_REPLY,
147 	.hdr_attr		= ETHTOOL_A_WOL_HEADER,
148 	.req_info_size		= sizeof(struct wol_req_info),
149 	.reply_data_size	= sizeof(struct wol_reply_data),
150 
151 	.prepare_data		= wol_prepare_data,
152 	.reply_size		= wol_reply_size,
153 	.fill_reply		= wol_fill_reply,
154 
155 	.set_validate		= ethnl_set_wol_validate,
156 	.set			= ethnl_set_wol,
157 	.set_ntf_cmd		= ETHTOOL_MSG_WOL_NTF,
158 };
159