1 /* SPDX-License-Identifier: GPL-2.0-only */
3 #ifndef _NET_ETHTOOL_NETLINK_H
4 #define _NET_ETHTOOL_NETLINK_H
6 #include <linux/ethtool_netlink.h>
7 #include <linux/netdevice.h>
8 #include <net/genetlink.h>
11 struct ethnl_req_info;
13 int ethnl_parse_header_dev_get(struct ethnl_req_info *req_info,
14 const struct nlattr *nest, struct net *net,
15 struct netlink_ext_ack *extack,
17 int ethnl_fill_reply_header(struct sk_buff *skb, struct net_device *dev,
19 struct sk_buff *ethnl_reply_init(size_t payload, struct net_device *dev, u8 cmd,
20 u16 hdr_attrtype, struct genl_info *info,
22 void *ethnl_bcastmsg_put(struct sk_buff *skb, u8 cmd);
23 int ethnl_multicast(struct sk_buff *skb, struct net_device *dev);
26 * ethnl_strz_size() - calculate attribute length for fixed size string
27 * @s: ETH_GSTRING_LEN sized string (may not be null terminated)
29 * Return: total length of an attribute with null terminated string from @s
31 static inline int ethnl_strz_size(const char *s)
33 return nla_total_size(strnlen(s, ETH_GSTRING_LEN) + 1);
37 * ethnl_put_strz() - put string attribute with fixed size string
38 * @skb: skb with the message
39 * @attrype: attribute type
40 * @s: ETH_GSTRING_LEN sized string (may not be null terminated)
42 * Puts an attribute with null terminated string from @s into the message.
44 * Return: 0 on success, negative error code on failure
46 static inline int ethnl_put_strz(struct sk_buff *skb, u16 attrtype,
49 unsigned int len = strnlen(s, ETH_GSTRING_LEN);
52 attr = nla_reserve(skb, attrtype, len + 1);
56 memcpy(nla_data(attr), s, len);
57 ((char *)nla_data(attr))[len] = '\0';
62 * ethnl_update_u32() - update u32 value from NLA_U32 attribute
63 * @dst: value to update
64 * @attr: netlink attribute with new value or null
65 * @mod: pointer to bool for modification tracking
67 * Copy the u32 value from NLA_U32 netlink attribute @attr into variable
68 * pointed to by @dst; do nothing if @attr is null. Bool pointed to by @mod
69 * is set to true if this function changed the value of *dst, otherwise it
72 static inline void ethnl_update_u32(u32 *dst, const struct nlattr *attr,
79 val = nla_get_u32(attr);
88 * ethnl_update_u8() - update u8 value from NLA_U8 attribute
89 * @dst: value to update
90 * @attr: netlink attribute with new value or null
91 * @mod: pointer to bool for modification tracking
93 * Copy the u8 value from NLA_U8 netlink attribute @attr into variable
94 * pointed to by @dst; do nothing if @attr is null. Bool pointed to by @mod
95 * is set to true if this function changed the value of *dst, otherwise it
98 static inline void ethnl_update_u8(u8 *dst, const struct nlattr *attr,
105 val = nla_get_u8(attr);
114 * ethnl_update_bool32() - update u32 used as bool from NLA_U8 attribute
115 * @dst: value to update
116 * @attr: netlink attribute with new value or null
117 * @mod: pointer to bool for modification tracking
119 * Use the u8 value from NLA_U8 netlink attribute @attr to set u32 variable
120 * pointed to by @dst to 0 (if zero) or 1 (if not); do nothing if @attr is
121 * null. Bool pointed to by @mod is set to true if this function changed the
122 * logical value of *dst, otherwise it is left as is.
124 static inline void ethnl_update_bool32(u32 *dst, const struct nlattr *attr,
131 val = !!nla_get_u8(attr);
140 * ethnl_update_binary() - update binary data from NLA_BINARY atribute
141 * @dst: value to update
142 * @len: destination buffer length
143 * @attr: netlink attribute with new value or null
144 * @mod: pointer to bool for modification tracking
146 * Use the u8 value from NLA_U8 netlink attribute @attr to rewrite data block
147 * of length @len at @dst by attribute payload; do nothing if @attr is null.
148 * Bool pointed to by @mod is set to true if this function changed the logical
149 * value of *dst, otherwise it is left as is.
151 static inline void ethnl_update_binary(void *dst, unsigned int len,
152 const struct nlattr *attr, bool *mod)
156 if (nla_len(attr) < len)
158 if (!memcmp(dst, nla_data(attr), len))
161 memcpy(dst, nla_data(attr), len);
166 * ethnl_update_bitfield32() - update u32 value from NLA_BITFIELD32 attribute
167 * @dst: value to update
168 * @attr: netlink attribute with new value or null
169 * @mod: pointer to bool for modification tracking
171 * Update bits in u32 value which are set in attribute's mask to values from
172 * attribute's value. Do nothing if @attr is null or the value wouldn't change;
173 * otherwise, set bool pointed to by @mod to true.
175 static inline void ethnl_update_bitfield32(u32 *dst, const struct nlattr *attr,
178 struct nla_bitfield32 change;
183 change = nla_get_bitfield32(attr);
184 newval = (*dst & ~change.selector) | (change.value & change.selector);
193 * ethnl_reply_header_size() - total size of reply header
195 * This is an upper estimate so that we do not need to hold RTNL lock longer
196 * than necessary (to prevent rename between size estimate and composing the
197 * message). Accounts only for device ifindex and name as those are the only
198 * attributes ethnl_fill_reply_header() puts into the reply header.
200 static inline unsigned int ethnl_reply_header_size(void)
202 return nla_total_size(nla_total_size(sizeof(u32)) +
203 nla_total_size(IFNAMSIZ));
206 /* GET request handling */
208 /* Unified processing of GET requests uses two data structures: request info
209 * and reply data. Request info holds information parsed from client request
210 * and its stays constant through all request processing. Reply data holds data
211 * retrieved from ethtool_ops callbacks or other internal sources which is used
212 * to compose the reply. When processing a dump request, request info is filled
213 * only once (when the request message is parsed) but reply data is filled for
214 * each reply message.
216 * Both structures consist of part common for all request types (struct
217 * ethnl_req_info and struct ethnl_reply_data defined below) and optional
218 * parts specific for each request type. Common part always starts at offset 0.
222 * struct ethnl_req_info - base type of request information for GET requests
223 * @dev: network device the request is for (may be null)
224 * @flags: request flags common for all request types
226 * This is a common base for request specific structures holding data from
227 * parsed userspace request. These always embed struct ethnl_req_info at
230 struct ethnl_req_info {
231 struct net_device *dev;
236 * struct ethnl_reply_data - base type of reply data for GET requests
237 * @dev: device for current reply message; in single shot requests it is
238 * equal to ðnl_req_info.dev; in dumps it's different for each
241 * This is a common base for request specific structures holding data for
242 * kernel reply message. These always embed struct ethnl_reply_data at zero
245 struct ethnl_reply_data {
246 struct net_device *dev;
249 static inline int ethnl_ops_begin(struct net_device *dev)
251 if (dev && dev->ethtool_ops->begin)
252 return dev->ethtool_ops->begin(dev);
257 static inline void ethnl_ops_complete(struct net_device *dev)
259 if (dev && dev->ethtool_ops->complete)
260 dev->ethtool_ops->complete(dev);
264 * struct ethnl_request_ops - unified handling of GET requests
265 * @request_cmd: command id for request (GET)
266 * @reply_cmd: command id for reply (GET_REPLY)
267 * @hdr_attr: attribute type for request header
268 * @max_attr: maximum (top level) attribute type
269 * @req_info_size: size of request info
270 * @reply_data_size: size of reply data
271 * @request_policy: netlink policy for message contents
272 * @allow_nodev_do: allow non-dump request with no device identification
274 * Parse request except common header (struct ethnl_req_info). Common
275 * header is already filled on entry, the rest up to @repdata_offset
276 * is zero initialized. This callback should only modify type specific
277 * request info by parsed attributes from request message.
279 * Retrieve and prepare data needed to compose a reply message. Calls to
280 * ethtool_ops handlers are limited to this callback. Common reply data
281 * (struct ethnl_reply_data) is filled on entry, type specific part after
282 * it is zero initialized. This callback should only modify the type
283 * specific part of reply data. Device identification from struct
284 * ethnl_reply_data is to be used as for dump requests, it iterates
285 * through network devices while dev member of struct ethnl_req_info
286 * points to the device from client request.
288 * Estimate reply message size. Returned value must be sufficient for
289 * message payload without common reply header. The callback may returned
290 * estimate higher than actual message size if exact calculation would
291 * not be worth the saved memory space.
293 * Fill reply message payload (except for common header) from reply data.
294 * The callback must not generate more payload than previously called
295 * ->reply_size() estimated.
297 * Optional cleanup called when reply data is no longer needed. Can be
298 * used e.g. to free any additional data structures outside the main
299 * structure which were allocated by ->prepare_data(). When processing
300 * dump requests, ->cleanup() is called for each message.
302 * Description of variable parts of GET request handling when using the
303 * unified infrastructure. When used, a pointer to an instance of this
304 * structure is to be added to ðnl_default_requests array and generic
305 * handlers ethnl_default_doit(), ethnl_default_dumpit(),
306 * ethnl_default_start() and ethnl_default_done() used in @ethtool_genl_ops;
307 * ethnl_default_notify() can be used in @ethnl_notify_handlers to send
308 * notifications of the corresponding type.
310 struct ethnl_request_ops {
314 unsigned int max_attr;
315 unsigned int req_info_size;
316 unsigned int reply_data_size;
317 const struct nla_policy *request_policy;
320 int (*parse_request)(struct ethnl_req_info *req_info,
322 struct netlink_ext_ack *extack);
323 int (*prepare_data)(const struct ethnl_req_info *req_info,
324 struct ethnl_reply_data *reply_data,
325 struct genl_info *info);
326 int (*reply_size)(const struct ethnl_req_info *req_info,
327 const struct ethnl_reply_data *reply_data);
328 int (*fill_reply)(struct sk_buff *skb,
329 const struct ethnl_req_info *req_info,
330 const struct ethnl_reply_data *reply_data);
331 void (*cleanup_data)(struct ethnl_reply_data *reply_data);
334 /* request handlers */
336 extern const struct ethnl_request_ops ethnl_strset_request_ops;
337 extern const struct ethnl_request_ops ethnl_linkinfo_request_ops;
338 extern const struct ethnl_request_ops ethnl_linkmodes_request_ops;
339 extern const struct ethnl_request_ops ethnl_linkstate_request_ops;
340 extern const struct ethnl_request_ops ethnl_debug_request_ops;
341 extern const struct ethnl_request_ops ethnl_wol_request_ops;
342 extern const struct ethnl_request_ops ethnl_features_request_ops;
343 extern const struct ethnl_request_ops ethnl_privflags_request_ops;
344 extern const struct ethnl_request_ops ethnl_rings_request_ops;
345 extern const struct ethnl_request_ops ethnl_channels_request_ops;
346 extern const struct ethnl_request_ops ethnl_coalesce_request_ops;
347 extern const struct ethnl_request_ops ethnl_pause_request_ops;
348 extern const struct ethnl_request_ops ethnl_eee_request_ops;
349 extern const struct ethnl_request_ops ethnl_tsinfo_request_ops;
351 int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info);
352 int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info);
353 int ethnl_set_debug(struct sk_buff *skb, struct genl_info *info);
354 int ethnl_set_wol(struct sk_buff *skb, struct genl_info *info);
355 int ethnl_set_features(struct sk_buff *skb, struct genl_info *info);
356 int ethnl_set_privflags(struct sk_buff *skb, struct genl_info *info);
357 int ethnl_set_rings(struct sk_buff *skb, struct genl_info *info);
358 int ethnl_set_channels(struct sk_buff *skb, struct genl_info *info);
359 int ethnl_set_coalesce(struct sk_buff *skb, struct genl_info *info);
360 int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info);
361 int ethnl_set_eee(struct sk_buff *skb, struct genl_info *info);
362 int ethnl_act_cable_test(struct sk_buff *skb, struct genl_info *info);
363 int ethnl_act_cable_test_tdr(struct sk_buff *skb, struct genl_info *info);
365 #endif /* _NET_ETHTOOL_NETLINK_H */