1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include "netlink.h"
4 #include "common.h"
5 #include "bitset.h"
6
7 struct features_req_info {
8 struct ethnl_req_info base;
9 };
10
11 struct features_reply_data {
12 struct ethnl_reply_data base;
13 u32 hw[ETHTOOL_DEV_FEATURE_WORDS];
14 u32 wanted[ETHTOOL_DEV_FEATURE_WORDS];
15 u32 active[ETHTOOL_DEV_FEATURE_WORDS];
16 u32 nochange[ETHTOOL_DEV_FEATURE_WORDS];
17 u32 all[ETHTOOL_DEV_FEATURE_WORDS];
18 };
19
20 #define FEATURES_REPDATA(__reply_base) \
21 container_of(__reply_base, struct features_reply_data, base)
22
23 const struct nla_policy ethnl_features_get_policy[] = {
24 [ETHTOOL_A_FEATURES_HEADER] =
25 NLA_POLICY_NESTED(ethnl_header_policy),
26 };
27
ethnl_features_to_bitmap32(u32 * dest,netdev_features_t src)28 static void ethnl_features_to_bitmap32(u32 *dest, netdev_features_t src)
29 {
30 unsigned int i;
31
32 for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; i++)
33 dest[i] = src >> (32 * i);
34 }
35
features_prepare_data(const struct ethnl_req_info * req_base,struct ethnl_reply_data * reply_base,struct genl_info * info)36 static int features_prepare_data(const struct ethnl_req_info *req_base,
37 struct ethnl_reply_data *reply_base,
38 struct genl_info *info)
39 {
40 struct features_reply_data *data = FEATURES_REPDATA(reply_base);
41 struct net_device *dev = reply_base->dev;
42 netdev_features_t all_features;
43
44 ethnl_features_to_bitmap32(data->hw, dev->hw_features);
45 ethnl_features_to_bitmap32(data->wanted, dev->wanted_features);
46 ethnl_features_to_bitmap32(data->active, dev->features);
47 ethnl_features_to_bitmap32(data->nochange, NETIF_F_NEVER_CHANGE);
48 all_features = GENMASK_ULL(NETDEV_FEATURE_COUNT - 1, 0);
49 ethnl_features_to_bitmap32(data->all, all_features);
50
51 return 0;
52 }
53
features_reply_size(const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)54 static int features_reply_size(const struct ethnl_req_info *req_base,
55 const struct ethnl_reply_data *reply_base)
56 {
57 const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
58 bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
59 unsigned int len = 0;
60 int ret;
61
62 ret = ethnl_bitset32_size(data->hw, data->all, NETDEV_FEATURE_COUNT,
63 netdev_features_strings, compact);
64 if (ret < 0)
65 return ret;
66 len += ret;
67 ret = ethnl_bitset32_size(data->wanted, NULL, NETDEV_FEATURE_COUNT,
68 netdev_features_strings, compact);
69 if (ret < 0)
70 return ret;
71 len += ret;
72 ret = ethnl_bitset32_size(data->active, NULL, NETDEV_FEATURE_COUNT,
73 netdev_features_strings, compact);
74 if (ret < 0)
75 return ret;
76 len += ret;
77 ret = ethnl_bitset32_size(data->nochange, NULL, NETDEV_FEATURE_COUNT,
78 netdev_features_strings, compact);
79 if (ret < 0)
80 return ret;
81 len += ret;
82
83 return len;
84 }
85
features_fill_reply(struct sk_buff * skb,const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)86 static int features_fill_reply(struct sk_buff *skb,
87 const struct ethnl_req_info *req_base,
88 const struct ethnl_reply_data *reply_base)
89 {
90 const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
91 bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
92 int ret;
93
94 ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_HW, data->hw,
95 data->all, NETDEV_FEATURE_COUNT,
96 netdev_features_strings, compact);
97 if (ret < 0)
98 return ret;
99 ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_WANTED, data->wanted,
100 NULL, NETDEV_FEATURE_COUNT,
101 netdev_features_strings, compact);
102 if (ret < 0)
103 return ret;
104 ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_ACTIVE, data->active,
105 NULL, NETDEV_FEATURE_COUNT,
106 netdev_features_strings, compact);
107 if (ret < 0)
108 return ret;
109 return ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_NOCHANGE,
110 data->nochange, NULL, NETDEV_FEATURE_COUNT,
111 netdev_features_strings, compact);
112 }
113
114 const struct ethnl_request_ops ethnl_features_request_ops = {
115 .request_cmd = ETHTOOL_MSG_FEATURES_GET,
116 .reply_cmd = ETHTOOL_MSG_FEATURES_GET_REPLY,
117 .hdr_attr = ETHTOOL_A_FEATURES_HEADER,
118 .req_info_size = sizeof(struct features_req_info),
119 .reply_data_size = sizeof(struct features_reply_data),
120
121 .prepare_data = features_prepare_data,
122 .reply_size = features_reply_size,
123 .fill_reply = features_fill_reply,
124 };
125
126 /* FEATURES_SET */
127
128 const struct nla_policy ethnl_features_set_policy[] = {
129 [ETHTOOL_A_FEATURES_HEADER] =
130 NLA_POLICY_NESTED(ethnl_header_policy),
131 [ETHTOOL_A_FEATURES_WANTED] = { .type = NLA_NESTED },
132 };
133
ethnl_features_to_bitmap(unsigned long * dest,netdev_features_t val)134 static void ethnl_features_to_bitmap(unsigned long *dest, netdev_features_t val)
135 {
136 const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT);
137 unsigned int i;
138
139 bitmap_zero(dest, NETDEV_FEATURE_COUNT);
140 for (i = 0; i < words; i++)
141 dest[i] = (unsigned long)(val >> (i * BITS_PER_LONG));
142 }
143
ethnl_bitmap_to_features(unsigned long * src)144 static netdev_features_t ethnl_bitmap_to_features(unsigned long *src)
145 {
146 const unsigned int nft_bits = sizeof(netdev_features_t) * BITS_PER_BYTE;
147 const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT);
148 netdev_features_t ret = 0;
149 unsigned int i;
150
151 for (i = 0; i < words; i++)
152 ret |= (netdev_features_t)(src[i]) << (i * BITS_PER_LONG);
153 ret &= ~(netdev_features_t)0 >> (nft_bits - NETDEV_FEATURE_COUNT);
154 return ret;
155 }
156
features_send_reply(struct net_device * dev,struct genl_info * info,const unsigned long * wanted,const unsigned long * wanted_mask,const unsigned long * active,const unsigned long * active_mask,bool compact)157 static int features_send_reply(struct net_device *dev, struct genl_info *info,
158 const unsigned long *wanted,
159 const unsigned long *wanted_mask,
160 const unsigned long *active,
161 const unsigned long *active_mask, bool compact)
162 {
163 struct sk_buff *rskb;
164 void *reply_payload;
165 int reply_len = 0;
166 int ret;
167
168 reply_len = ethnl_reply_header_size();
169 ret = ethnl_bitset_size(wanted, wanted_mask, NETDEV_FEATURE_COUNT,
170 netdev_features_strings, compact);
171 if (ret < 0)
172 goto err;
173 reply_len += ret;
174 ret = ethnl_bitset_size(active, active_mask, NETDEV_FEATURE_COUNT,
175 netdev_features_strings, compact);
176 if (ret < 0)
177 goto err;
178 reply_len += ret;
179
180 ret = -ENOMEM;
181 rskb = ethnl_reply_init(reply_len, dev, ETHTOOL_MSG_FEATURES_SET_REPLY,
182 ETHTOOL_A_FEATURES_HEADER, info,
183 &reply_payload);
184 if (!rskb)
185 goto err;
186
187 ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_WANTED, wanted,
188 wanted_mask, NETDEV_FEATURE_COUNT,
189 netdev_features_strings, compact);
190 if (ret < 0)
191 goto nla_put_failure;
192 ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_ACTIVE, active,
193 active_mask, NETDEV_FEATURE_COUNT,
194 netdev_features_strings, compact);
195 if (ret < 0)
196 goto nla_put_failure;
197
198 genlmsg_end(rskb, reply_payload);
199 ret = genlmsg_reply(rskb, info);
200 return ret;
201
202 nla_put_failure:
203 nlmsg_free(rskb);
204 WARN_ONCE(1, "calculated message payload length (%d) not sufficient\n",
205 reply_len);
206 err:
207 GENL_SET_ERR_MSG(info, "failed to send reply message");
208 return ret;
209 }
210
ethnl_set_features(struct sk_buff * skb,struct genl_info * info)211 int ethnl_set_features(struct sk_buff *skb, struct genl_info *info)
212 {
213 DECLARE_BITMAP(wanted_diff_mask, NETDEV_FEATURE_COUNT);
214 DECLARE_BITMAP(active_diff_mask, NETDEV_FEATURE_COUNT);
215 DECLARE_BITMAP(old_active, NETDEV_FEATURE_COUNT);
216 DECLARE_BITMAP(old_wanted, NETDEV_FEATURE_COUNT);
217 DECLARE_BITMAP(new_active, NETDEV_FEATURE_COUNT);
218 DECLARE_BITMAP(new_wanted, NETDEV_FEATURE_COUNT);
219 DECLARE_BITMAP(req_wanted, NETDEV_FEATURE_COUNT);
220 DECLARE_BITMAP(req_mask, NETDEV_FEATURE_COUNT);
221 struct ethnl_req_info req_info = {};
222 struct nlattr **tb = info->attrs;
223 struct net_device *dev;
224 bool mod;
225 int ret;
226
227 if (!tb[ETHTOOL_A_FEATURES_WANTED])
228 return -EINVAL;
229 ret = ethnl_parse_header_dev_get(&req_info,
230 tb[ETHTOOL_A_FEATURES_HEADER],
231 genl_info_net(info), info->extack,
232 true);
233 if (ret < 0)
234 return ret;
235 dev = req_info.dev;
236
237 rtnl_lock();
238 ethnl_features_to_bitmap(old_active, dev->features);
239 ethnl_features_to_bitmap(old_wanted, dev->wanted_features);
240 ret = ethnl_parse_bitset(req_wanted, req_mask, NETDEV_FEATURE_COUNT,
241 tb[ETHTOOL_A_FEATURES_WANTED],
242 netdev_features_strings, info->extack);
243 if (ret < 0)
244 goto out_rtnl;
245 if (ethnl_bitmap_to_features(req_mask) & ~NETIF_F_ETHTOOL_BITS) {
246 GENL_SET_ERR_MSG(info, "attempt to change non-ethtool features");
247 ret = -EINVAL;
248 goto out_rtnl;
249 }
250
251 /* set req_wanted bits not in req_mask from old_wanted */
252 bitmap_and(req_wanted, req_wanted, req_mask, NETDEV_FEATURE_COUNT);
253 bitmap_andnot(new_wanted, old_wanted, req_mask, NETDEV_FEATURE_COUNT);
254 bitmap_or(req_wanted, new_wanted, req_wanted, NETDEV_FEATURE_COUNT);
255 if (!bitmap_equal(req_wanted, old_wanted, NETDEV_FEATURE_COUNT)) {
256 dev->wanted_features &= ~dev->hw_features;
257 dev->wanted_features |= ethnl_bitmap_to_features(req_wanted) & dev->hw_features;
258 __netdev_update_features(dev);
259 }
260 ethnl_features_to_bitmap(new_active, dev->features);
261 mod = !bitmap_equal(old_active, new_active, NETDEV_FEATURE_COUNT);
262
263 ret = 0;
264 if (!(req_info.flags & ETHTOOL_FLAG_OMIT_REPLY)) {
265 bool compact = req_info.flags & ETHTOOL_FLAG_COMPACT_BITSETS;
266
267 bitmap_xor(wanted_diff_mask, req_wanted, new_active,
268 NETDEV_FEATURE_COUNT);
269 bitmap_xor(active_diff_mask, old_active, new_active,
270 NETDEV_FEATURE_COUNT);
271 bitmap_and(wanted_diff_mask, wanted_diff_mask, req_mask,
272 NETDEV_FEATURE_COUNT);
273 bitmap_and(req_wanted, req_wanted, wanted_diff_mask,
274 NETDEV_FEATURE_COUNT);
275 bitmap_and(new_active, new_active, active_diff_mask,
276 NETDEV_FEATURE_COUNT);
277
278 ret = features_send_reply(dev, info, req_wanted,
279 wanted_diff_mask, new_active,
280 active_diff_mask, compact);
281 }
282 if (mod)
283 netdev_features_change(dev);
284
285 out_rtnl:
286 rtnl_unlock();
287 dev_put(dev);
288 return ret;
289 }
290
