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1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/ethtool.h>
4#include <linux/phy.h>
5#include "netlink.h"
6#include "common.h"
7
8struct strset_info {
9 bool per_dev;
10 bool free_strings;
11 unsigned int count;
12 const char (*strings)[ETH_GSTRING_LEN];
13};
14
15static const struct strset_info info_template[] = {
16 [ETH_SS_TEST] = {
17 .per_dev = true,
18 },
19 [ETH_SS_STATS] = {
20 .per_dev = true,
21 },
22 [ETH_SS_PRIV_FLAGS] = {
23 .per_dev = true,
24 },
25 [ETH_SS_FEATURES] = {
26 .per_dev = false,
27 .count = ARRAY_SIZE(netdev_features_strings),
28 .strings = netdev_features_strings,
29 },
30 [ETH_SS_RSS_HASH_FUNCS] = {
31 .per_dev = false,
32 .count = ARRAY_SIZE(rss_hash_func_strings),
33 .strings = rss_hash_func_strings,
34 },
35 [ETH_SS_TUNABLES] = {
36 .per_dev = false,
37 .count = ARRAY_SIZE(tunable_strings),
38 .strings = tunable_strings,
39 },
40 [ETH_SS_PHY_STATS] = {
41 .per_dev = true,
42 },
43 [ETH_SS_PHY_TUNABLES] = {
44 .per_dev = false,
45 .count = ARRAY_SIZE(phy_tunable_strings),
46 .strings = phy_tunable_strings,
47 },
48 [ETH_SS_LINK_MODES] = {
49 .per_dev = false,
50 .count = __ETHTOOL_LINK_MODE_MASK_NBITS,
51 .strings = link_mode_names,
52 },
53 [ETH_SS_MSG_CLASSES] = {
54 .per_dev = false,
55 .count = NETIF_MSG_CLASS_COUNT,
56 .strings = netif_msg_class_names,
57 },
58 [ETH_SS_WOL_MODES] = {
59 .per_dev = false,
60 .count = WOL_MODE_COUNT,
61 .strings = wol_mode_names,
62 },
63 [ETH_SS_SOF_TIMESTAMPING] = {
64 .per_dev = false,
65 .count = __SOF_TIMESTAMPING_CNT,
66 .strings = sof_timestamping_names,
67 },
68 [ETH_SS_TS_TX_TYPES] = {
69 .per_dev = false,
70 .count = __HWTSTAMP_TX_CNT,
71 .strings = ts_tx_type_names,
72 },
73 [ETH_SS_TS_RX_FILTERS] = {
74 .per_dev = false,
75 .count = __HWTSTAMP_FILTER_CNT,
76 .strings = ts_rx_filter_names,
77 },
78 [ETH_SS_UDP_TUNNEL_TYPES] = {
79 .per_dev = false,
80 .count = __ETHTOOL_UDP_TUNNEL_TYPE_CNT,
81 .strings = udp_tunnel_type_names,
82 },
83 [ETH_SS_STATS_STD] = {
84 .per_dev = false,
85 .count = __ETHTOOL_STATS_CNT,
86 .strings = stats_std_names,
87 },
88 [ETH_SS_STATS_ETH_PHY] = {
89 .per_dev = false,
90 .count = __ETHTOOL_A_STATS_ETH_PHY_CNT,
91 .strings = stats_eth_phy_names,
92 },
93 [ETH_SS_STATS_ETH_MAC] = {
94 .per_dev = false,
95 .count = __ETHTOOL_A_STATS_ETH_MAC_CNT,
96 .strings = stats_eth_mac_names,
97 },
98 [ETH_SS_STATS_ETH_CTRL] = {
99 .per_dev = false,
100 .count = __ETHTOOL_A_STATS_ETH_CTRL_CNT,
101 .strings = stats_eth_ctrl_names,
102 },
103 [ETH_SS_STATS_RMON] = {
104 .per_dev = false,
105 .count = __ETHTOOL_A_STATS_RMON_CNT,
106 .strings = stats_rmon_names,
107 },
108};
109
110struct strset_req_info {
111 struct ethnl_req_info base;
112 u32 req_ids;
113 bool counts_only;
114};
115
116#define STRSET_REQINFO(__req_base) \
117 container_of(__req_base, struct strset_req_info, base)
118
119struct strset_reply_data {
120 struct ethnl_reply_data base;
121 struct strset_info sets[ETH_SS_COUNT];
122};
123
124#define STRSET_REPDATA(__reply_base) \
125 container_of(__reply_base, struct strset_reply_data, base)
126
127const struct nla_policy ethnl_strset_get_policy[] = {
128 [ETHTOOL_A_STRSET_HEADER] =
129 NLA_POLICY_NESTED(ethnl_header_policy_phy),
130 [ETHTOOL_A_STRSET_STRINGSETS] = { .type = NLA_NESTED },
131 [ETHTOOL_A_STRSET_COUNTS_ONLY] = { .type = NLA_FLAG },
132};
133
134static const struct nla_policy get_stringset_policy[] = {
135 [ETHTOOL_A_STRINGSET_ID] = { .type = NLA_U32 },
136};
137
138/**
139 * strset_include() - test if a string set should be included in reply
140 * @info: parsed client request
141 * @data: pointer to request data structure
142 * @id: id of string set to check (ETH_SS_* constants)
143 */
144static bool strset_include(const struct strset_req_info *info,
145 const struct strset_reply_data *data, u32 id)
146{
147 bool per_dev;
148
149 BUILD_BUG_ON(ETH_SS_COUNT >= BITS_PER_BYTE * sizeof(info->req_ids));
150
151 if (info->req_ids)
152 return info->req_ids & (1U << id);
153 per_dev = data->sets[id].per_dev;
154 if (!per_dev && !data->sets[id].strings)
155 return false;
156
157 return data->base.dev ? per_dev : !per_dev;
158}
159
160static int strset_get_id(const struct nlattr *nest, u32 *val,
161 struct netlink_ext_ack *extack)
162{
163 struct nlattr *tb[ARRAY_SIZE(get_stringset_policy)];
164 int ret;
165
166 ret = nla_parse_nested(tb, ARRAY_SIZE(get_stringset_policy) - 1, nest,
167 get_stringset_policy, extack);
168 if (ret < 0)
169 return ret;
170 if (NL_REQ_ATTR_CHECK(extack, nest, tb, ETHTOOL_A_STRINGSET_ID))
171 return -EINVAL;
172
173 *val = nla_get_u32(tb[ETHTOOL_A_STRINGSET_ID]);
174 return 0;
175}
176
177static const struct nla_policy strset_stringsets_policy[] = {
178 [ETHTOOL_A_STRINGSETS_STRINGSET] = { .type = NLA_NESTED },
179};
180
181static int strset_parse_request(struct ethnl_req_info *req_base,
182 struct nlattr **tb,
183 struct netlink_ext_ack *extack)
184{
185 struct strset_req_info *req_info = STRSET_REQINFO(req_base);
186 struct nlattr *nest = tb[ETHTOOL_A_STRSET_STRINGSETS];
187 struct nlattr *attr;
188 int rem, ret;
189
190 if (!nest)
191 return 0;
192 ret = nla_validate_nested(nest,
193 ARRAY_SIZE(strset_stringsets_policy) - 1,
194 strset_stringsets_policy, extack);
195 if (ret < 0)
196 return ret;
197
198 req_info->counts_only = tb[ETHTOOL_A_STRSET_COUNTS_ONLY];
199 nla_for_each_nested(attr, nest, rem) {
200 u32 id;
201
202 if (WARN_ONCE(nla_type(attr) != ETHTOOL_A_STRINGSETS_STRINGSET,
203 "unexpected attrtype %u in ETHTOOL_A_STRSET_STRINGSETS\n",
204 nla_type(attr)))
205 return -EINVAL;
206
207 ret = strset_get_id(attr, &id, extack);
208 if (ret < 0)
209 return ret;
210 if (id >= ETH_SS_COUNT) {
211 NL_SET_ERR_MSG_ATTR(extack, attr,
212 "unknown string set id");
213 return -EOPNOTSUPP;
214 }
215
216 req_info->req_ids |= (1U << id);
217 }
218
219 return 0;
220}
221
222static void strset_cleanup_data(struct ethnl_reply_data *reply_base)
223{
224 struct strset_reply_data *data = STRSET_REPDATA(reply_base);
225 unsigned int i;
226
227 for (i = 0; i < ETH_SS_COUNT; i++)
228 if (data->sets[i].free_strings) {
229 kfree(data->sets[i].strings);
230 data->sets[i].strings = NULL;
231 data->sets[i].free_strings = false;
232 }
233}
234
235static int strset_prepare_set(struct strset_info *info, struct net_device *dev,
236 struct phy_device *phydev, unsigned int id,
237 bool counts_only)
238{
239 const struct ethtool_phy_ops *phy_ops = ethtool_phy_ops;
240 const struct ethtool_ops *ops = dev->ethtool_ops;
241 void *strings;
242 int count, ret;
243
244 if (id == ETH_SS_PHY_STATS && phydev &&
245 !ops->get_ethtool_phy_stats && phy_ops &&
246 phy_ops->get_sset_count)
247 ret = phy_ops->get_sset_count(phydev);
248 else if (ops->get_sset_count && ops->get_strings)
249 ret = ops->get_sset_count(dev, id);
250 else
251 ret = -EOPNOTSUPP;
252 if (ret <= 0) {
253 info->count = 0;
254 return 0;
255 }
256
257 count = ret;
258 if (!counts_only) {
259 strings = kcalloc(count, ETH_GSTRING_LEN, GFP_KERNEL);
260 if (!strings)
261 return -ENOMEM;
262 if (id == ETH_SS_PHY_STATS && phydev &&
263 !ops->get_ethtool_phy_stats && phy_ops &&
264 phy_ops->get_strings)
265 phy_ops->get_strings(phydev, strings);
266 else
267 ops->get_strings(dev, id, strings);
268 info->strings = strings;
269 info->free_strings = true;
270 }
271 info->count = count;
272
273 return 0;
274}
275
276static int strset_prepare_data(const struct ethnl_req_info *req_base,
277 struct ethnl_reply_data *reply_base,
278 const struct genl_info *info)
279{
280 const struct strset_req_info *req_info = STRSET_REQINFO(req_base);
281 struct strset_reply_data *data = STRSET_REPDATA(reply_base);
282 struct net_device *dev = reply_base->dev;
283 struct nlattr **tb = info->attrs;
284 struct phy_device *phydev;
285 unsigned int i;
286 int ret;
287
288 BUILD_BUG_ON(ARRAY_SIZE(info_template) != ETH_SS_COUNT);
289 memcpy(&data->sets, &info_template, sizeof(data->sets));
290
291 if (!dev) {
292 for (i = 0; i < ETH_SS_COUNT; i++) {
293 if ((req_info->req_ids & (1U << i)) &&
294 data->sets[i].per_dev) {
295 GENL_SET_ERR_MSG(info, "requested per device strings without dev");
296 return -EINVAL;
297 }
298 }
299 return 0;
300 }
301
302 phydev = ethnl_req_get_phydev(req_base, tb, ETHTOOL_A_HEADER_FLAGS,
303 info->extack);
304
305 /* phydev can be NULL, check for errors only */
306 if (IS_ERR(phydev))
307 return PTR_ERR(phydev);
308
309 ret = ethnl_ops_begin(dev);
310 if (ret < 0)
311 goto err_strset;
312 for (i = 0; i < ETH_SS_COUNT; i++) {
313 if (!strset_include(req_info, data, i) ||
314 !data->sets[i].per_dev)
315 continue;
316
317 ret = strset_prepare_set(&data->sets[i], dev, phydev, i,
318 req_info->counts_only);
319 if (ret < 0)
320 goto err_ops;
321 }
322 ethnl_ops_complete(dev);
323
324 return 0;
325err_ops:
326 ethnl_ops_complete(dev);
327err_strset:
328 strset_cleanup_data(reply_base);
329 return ret;
330}
331
332/* calculate size of ETHTOOL_A_STRSET_STRINGSET nest for one string set */
333static int strset_set_size(const struct strset_info *info, bool counts_only)
334{
335 unsigned int len = 0;
336 unsigned int i;
337
338 if (info->count == 0)
339 return 0;
340 if (counts_only)
341 return nla_total_size(2 * nla_total_size(sizeof(u32)));
342
343 for (i = 0; i < info->count; i++) {
344 const char *str = info->strings[i];
345
346 /* ETHTOOL_A_STRING_INDEX, ETHTOOL_A_STRING_VALUE, nest */
347 len += nla_total_size(nla_total_size(sizeof(u32)) +
348 ethnl_strz_size(str));
349 }
350 /* ETHTOOL_A_STRINGSET_ID, ETHTOOL_A_STRINGSET_COUNT */
351 len = 2 * nla_total_size(sizeof(u32)) + nla_total_size(len);
352
353 return nla_total_size(len);
354}
355
356static int strset_reply_size(const struct ethnl_req_info *req_base,
357 const struct ethnl_reply_data *reply_base)
358{
359 const struct strset_req_info *req_info = STRSET_REQINFO(req_base);
360 const struct strset_reply_data *data = STRSET_REPDATA(reply_base);
361 unsigned int i;
362 int len = 0;
363 int ret;
364
365 len += nla_total_size(0); /* ETHTOOL_A_STRSET_STRINGSETS */
366
367 for (i = 0; i < ETH_SS_COUNT; i++) {
368 const struct strset_info *set_info = &data->sets[i];
369
370 if (!strset_include(req_info, data, i))
371 continue;
372
373 ret = strset_set_size(set_info, req_info->counts_only);
374 if (ret < 0)
375 return ret;
376 len += ret;
377 }
378
379 return len;
380}
381
382/* fill one string into reply */
383static int strset_fill_string(struct sk_buff *skb,
384 const struct strset_info *set_info, u32 idx)
385{
386 struct nlattr *string_attr;
387 const char *value;
388
389 value = set_info->strings[idx];
390
391 string_attr = nla_nest_start(skb, ETHTOOL_A_STRINGS_STRING);
392 if (!string_attr)
393 return -EMSGSIZE;
394 if (nla_put_u32(skb, ETHTOOL_A_STRING_INDEX, idx) ||
395 ethnl_put_strz(skb, ETHTOOL_A_STRING_VALUE, value))
396 goto nla_put_failure;
397 nla_nest_end(skb, string_attr);
398
399 return 0;
400nla_put_failure:
401 nla_nest_cancel(skb, string_attr);
402 return -EMSGSIZE;
403}
404
405/* fill one string set into reply */
406static int strset_fill_set(struct sk_buff *skb,
407 const struct strset_info *set_info, u32 id,
408 bool counts_only)
409{
410 struct nlattr *stringset_attr;
411 struct nlattr *strings_attr;
412 unsigned int i;
413
414 if (!set_info->per_dev && !set_info->strings)
415 return -EOPNOTSUPP;
416 if (set_info->count == 0)
417 return 0;
418 stringset_attr = nla_nest_start(skb, ETHTOOL_A_STRINGSETS_STRINGSET);
419 if (!stringset_attr)
420 return -EMSGSIZE;
421
422 if (nla_put_u32(skb, ETHTOOL_A_STRINGSET_ID, id) ||
423 nla_put_u32(skb, ETHTOOL_A_STRINGSET_COUNT, set_info->count))
424 goto nla_put_failure;
425
426 if (!counts_only) {
427 strings_attr = nla_nest_start(skb, ETHTOOL_A_STRINGSET_STRINGS);
428 if (!strings_attr)
429 goto nla_put_failure;
430 for (i = 0; i < set_info->count; i++) {
431 if (strset_fill_string(skb, set_info, i) < 0)
432 goto nla_put_failure;
433 }
434 nla_nest_end(skb, strings_attr);
435 }
436
437 nla_nest_end(skb, stringset_attr);
438 return 0;
439
440nla_put_failure:
441 nla_nest_cancel(skb, stringset_attr);
442 return -EMSGSIZE;
443}
444
445static int strset_fill_reply(struct sk_buff *skb,
446 const struct ethnl_req_info *req_base,
447 const struct ethnl_reply_data *reply_base)
448{
449 const struct strset_req_info *req_info = STRSET_REQINFO(req_base);
450 const struct strset_reply_data *data = STRSET_REPDATA(reply_base);
451 struct nlattr *nest;
452 unsigned int i;
453 int ret;
454
455 nest = nla_nest_start(skb, ETHTOOL_A_STRSET_STRINGSETS);
456 if (!nest)
457 return -EMSGSIZE;
458
459 for (i = 0; i < ETH_SS_COUNT; i++) {
460 if (strset_include(req_info, data, i)) {
461 ret = strset_fill_set(skb, &data->sets[i], i,
462 req_info->counts_only);
463 if (ret < 0)
464 goto nla_put_failure;
465 }
466 }
467
468 nla_nest_end(skb, nest);
469 return 0;
470
471nla_put_failure:
472 nla_nest_cancel(skb, nest);
473 return ret;
474}
475
476const struct ethnl_request_ops ethnl_strset_request_ops = {
477 .request_cmd = ETHTOOL_MSG_STRSET_GET,
478 .reply_cmd = ETHTOOL_MSG_STRSET_GET_REPLY,
479 .hdr_attr = ETHTOOL_A_STRSET_HEADER,
480 .req_info_size = sizeof(struct strset_req_info),
481 .reply_data_size = sizeof(struct strset_reply_data),
482 .allow_nodev_do = true,
483
484 .parse_request = strset_parse_request,
485 .prepare_data = strset_prepare_data,
486 .reply_size = strset_reply_size,
487 .fill_reply = strset_fill_reply,
488 .cleanup_data = strset_cleanup_data,
489};