1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 3 #ifndef _NET_ETHTOOL_NETLINK_H 4 #define _NET_ETHTOOL_NETLINK_H 5 6 #include <linux/ethtool_netlink.h> 7 #include <linux/netdevice.h> 8 #include <net/genetlink.h> 9 #include <net/sock.h> 10 11 struct ethnl_req_info; 12 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, 16 bool require_dev); 17 int ethnl_fill_reply_header(struct sk_buff *skb, struct net_device *dev, 18 u16 attrtype); 19 struct sk_buff *ethnl_reply_init(size_t payload, struct net_device *dev, u8 cmd, 20 u16 hdr_attrtype, struct genl_info *info, 21 void **ehdrp); 22 void *ethnl_dump_put(struct sk_buff *skb, struct netlink_callback *cb, u8 cmd); 23 void *ethnl_bcastmsg_put(struct sk_buff *skb, u8 cmd); 24 int ethnl_multicast(struct sk_buff *skb, struct net_device *dev); 25 26 /** 27 * ethnl_strz_size() - calculate attribute length for fixed size string 28 * @s: ETH_GSTRING_LEN sized string (may not be null terminated) 29 * 30 * Return: total length of an attribute with null terminated string from @s 31 */ 32 static inline int ethnl_strz_size(const char *s) 33 { 34 return nla_total_size(strnlen(s, ETH_GSTRING_LEN) + 1); 35 } 36 37 /** 38 * ethnl_put_strz() - put string attribute with fixed size string 39 * @skb: skb with the message 40 * @attrype: attribute type 41 * @s: ETH_GSTRING_LEN sized string (may not be null terminated) 42 * 43 * Puts an attribute with null terminated string from @s into the message. 44 * 45 * Return: 0 on success, negative error code on failure 46 */ 47 static inline int ethnl_put_strz(struct sk_buff *skb, u16 attrtype, 48 const char *s) 49 { 50 unsigned int len = strnlen(s, ETH_GSTRING_LEN); 51 struct nlattr *attr; 52 53 attr = nla_reserve(skb, attrtype, len + 1); 54 if (!attr) 55 return -EMSGSIZE; 56 57 memcpy(nla_data(attr), s, len); 58 ((char *)nla_data(attr))[len] = '\0'; 59 return 0; 60 } 61 62 /** 63 * ethnl_update_u32() - update u32 value from NLA_U32 attribute 64 * @dst: value to update 65 * @attr: netlink attribute with new value or null 66 * @mod: pointer to bool for modification tracking 67 * 68 * Copy the u32 value from NLA_U32 netlink attribute @attr into variable 69 * pointed to by @dst; do nothing if @attr is null. Bool pointed to by @mod 70 * is set to true if this function changed the value of *dst, otherwise it 71 * is left as is. 72 */ 73 static inline void ethnl_update_u32(u32 *dst, const struct nlattr *attr, 74 bool *mod) 75 { 76 u32 val; 77 78 if (!attr) 79 return; 80 val = nla_get_u32(attr); 81 if (*dst == val) 82 return; 83 84 *dst = val; 85 *mod = true; 86 } 87 88 /** 89 * ethnl_update_u8() - update u8 value from NLA_U8 attribute 90 * @dst: value to update 91 * @attr: netlink attribute with new value or null 92 * @mod: pointer to bool for modification tracking 93 * 94 * Copy the u8 value from NLA_U8 netlink attribute @attr into variable 95 * pointed to by @dst; do nothing if @attr is null. Bool pointed to by @mod 96 * is set to true if this function changed the value of *dst, otherwise it 97 * is left as is. 98 */ 99 static inline void ethnl_update_u8(u8 *dst, const struct nlattr *attr, 100 bool *mod) 101 { 102 u8 val; 103 104 if (!attr) 105 return; 106 val = nla_get_u8(attr); 107 if (*dst == val) 108 return; 109 110 *dst = val; 111 *mod = true; 112 } 113 114 /** 115 * ethnl_update_bool32() - update u32 used as bool from NLA_U8 attribute 116 * @dst: value to update 117 * @attr: netlink attribute with new value or null 118 * @mod: pointer to bool for modification tracking 119 * 120 * Use the u8 value from NLA_U8 netlink attribute @attr to set u32 variable 121 * pointed to by @dst to 0 (if zero) or 1 (if not); do nothing if @attr is 122 * null. Bool pointed to by @mod is set to true if this function changed the 123 * logical value of *dst, otherwise it is left as is. 124 */ 125 static inline void ethnl_update_bool32(u32 *dst, const struct nlattr *attr, 126 bool *mod) 127 { 128 u8 val; 129 130 if (!attr) 131 return; 132 val = !!nla_get_u8(attr); 133 if (!!*dst == val) 134 return; 135 136 *dst = val; 137 *mod = true; 138 } 139 140 /** 141 * ethnl_update_binary() - update binary data from NLA_BINARY atribute 142 * @dst: value to update 143 * @len: destination buffer length 144 * @attr: netlink attribute with new value or null 145 * @mod: pointer to bool for modification tracking 146 * 147 * Use the u8 value from NLA_U8 netlink attribute @attr to rewrite data block 148 * of length @len at @dst by attribute payload; do nothing if @attr is null. 149 * Bool pointed to by @mod is set to true if this function changed the logical 150 * value of *dst, otherwise it is left as is. 151 */ 152 static inline void ethnl_update_binary(void *dst, unsigned int len, 153 const struct nlattr *attr, bool *mod) 154 { 155 if (!attr) 156 return; 157 if (nla_len(attr) < len) 158 len = nla_len(attr); 159 if (!memcmp(dst, nla_data(attr), len)) 160 return; 161 162 memcpy(dst, nla_data(attr), len); 163 *mod = true; 164 } 165 166 /** 167 * ethnl_update_bitfield32() - update u32 value from NLA_BITFIELD32 attribute 168 * @dst: value to update 169 * @attr: netlink attribute with new value or null 170 * @mod: pointer to bool for modification tracking 171 * 172 * Update bits in u32 value which are set in attribute's mask to values from 173 * attribute's value. Do nothing if @attr is null or the value wouldn't change; 174 * otherwise, set bool pointed to by @mod to true. 175 */ 176 static inline void ethnl_update_bitfield32(u32 *dst, const struct nlattr *attr, 177 bool *mod) 178 { 179 struct nla_bitfield32 change; 180 u32 newval; 181 182 if (!attr) 183 return; 184 change = nla_get_bitfield32(attr); 185 newval = (*dst & ~change.selector) | (change.value & change.selector); 186 if (*dst == newval) 187 return; 188 189 *dst = newval; 190 *mod = true; 191 } 192 193 /** 194 * ethnl_reply_header_size() - total size of reply header 195 * 196 * This is an upper estimate so that we do not need to hold RTNL lock longer 197 * than necessary (to prevent rename between size estimate and composing the 198 * message). Accounts only for device ifindex and name as those are the only 199 * attributes ethnl_fill_reply_header() puts into the reply header. 200 */ 201 static inline unsigned int ethnl_reply_header_size(void) 202 { 203 return nla_total_size(nla_total_size(sizeof(u32)) + 204 nla_total_size(IFNAMSIZ)); 205 } 206 207 /* GET request handling */ 208 209 /* Unified processing of GET requests uses two data structures: request info 210 * and reply data. Request info holds information parsed from client request 211 * and its stays constant through all request processing. Reply data holds data 212 * retrieved from ethtool_ops callbacks or other internal sources which is used 213 * to compose the reply. When processing a dump request, request info is filled 214 * only once (when the request message is parsed) but reply data is filled for 215 * each reply message. 216 * 217 * Both structures consist of part common for all request types (struct 218 * ethnl_req_info and struct ethnl_reply_data defined below) and optional 219 * parts specific for each request type. Common part always starts at offset 0. 220 */ 221 222 /** 223 * struct ethnl_req_info - base type of request information for GET requests 224 * @dev: network device the request is for (may be null) 225 * @flags: request flags common for all request types 226 * 227 * This is a common base for request specific structures holding data from 228 * parsed userspace request. These always embed struct ethnl_req_info at 229 * zero offset. 230 */ 231 struct ethnl_req_info { 232 struct net_device *dev; 233 u32 flags; 234 }; 235 236 /** 237 * struct ethnl_reply_data - base type of reply data for GET requests 238 * @dev: device for current reply message; in single shot requests it is 239 * equal to ðnl_req_info.dev; in dumps it's different for each 240 * reply message 241 * 242 * This is a common base for request specific structures holding data for 243 * kernel reply message. These always embed struct ethnl_reply_data at zero 244 * offset. 245 */ 246 struct ethnl_reply_data { 247 struct net_device *dev; 248 }; 249 250 static inline int ethnl_ops_begin(struct net_device *dev) 251 { 252 if (dev && dev->ethtool_ops->begin) 253 return dev->ethtool_ops->begin(dev); 254 else 255 return 0; 256 } 257 258 static inline void ethnl_ops_complete(struct net_device *dev) 259 { 260 if (dev && dev->ethtool_ops->complete) 261 dev->ethtool_ops->complete(dev); 262 } 263 264 /** 265 * struct ethnl_request_ops - unified handling of GET requests 266 * @request_cmd: command id for request (GET) 267 * @reply_cmd: command id for reply (GET_REPLY) 268 * @hdr_attr: attribute type for request header 269 * @req_info_size: size of request info 270 * @reply_data_size: size of reply data 271 * @allow_nodev_do: allow non-dump request with no device identification 272 * @parse_request: 273 * Parse request except common header (struct ethnl_req_info). Common 274 * header is already filled on entry, the rest up to @repdata_offset 275 * is zero initialized. This callback should only modify type specific 276 * request info by parsed attributes from request message. 277 * @prepare_data: 278 * Retrieve and prepare data needed to compose a reply message. Calls to 279 * ethtool_ops handlers are limited to this callback. Common reply data 280 * (struct ethnl_reply_data) is filled on entry, type specific part after 281 * it is zero initialized. This callback should only modify the type 282 * specific part of reply data. Device identification from struct 283 * ethnl_reply_data is to be used as for dump requests, it iterates 284 * through network devices while dev member of struct ethnl_req_info 285 * points to the device from client request. 286 * @reply_size: 287 * Estimate reply message size. Returned value must be sufficient for 288 * message payload without common reply header. The callback may returned 289 * estimate higher than actual message size if exact calculation would 290 * not be worth the saved memory space. 291 * @fill_reply: 292 * Fill reply message payload (except for common header) from reply data. 293 * The callback must not generate more payload than previously called 294 * ->reply_size() estimated. 295 * @cleanup_data: 296 * Optional cleanup called when reply data is no longer needed. Can be 297 * used e.g. to free any additional data structures outside the main 298 * structure which were allocated by ->prepare_data(). When processing 299 * dump requests, ->cleanup() is called for each message. 300 * 301 * Description of variable parts of GET request handling when using the 302 * unified infrastructure. When used, a pointer to an instance of this 303 * structure is to be added to ðnl_default_requests array and generic 304 * handlers ethnl_default_doit(), ethnl_default_dumpit(), 305 * ethnl_default_start() and ethnl_default_done() used in @ethtool_genl_ops; 306 * ethnl_default_notify() can be used in @ethnl_notify_handlers to send 307 * notifications of the corresponding type. 308 */ 309 struct ethnl_request_ops { 310 u8 request_cmd; 311 u8 reply_cmd; 312 u16 hdr_attr; 313 unsigned int req_info_size; 314 unsigned int reply_data_size; 315 bool allow_nodev_do; 316 317 int (*parse_request)(struct ethnl_req_info *req_info, 318 struct nlattr **tb, 319 struct netlink_ext_ack *extack); 320 int (*prepare_data)(const struct ethnl_req_info *req_info, 321 struct ethnl_reply_data *reply_data, 322 struct genl_info *info); 323 int (*reply_size)(const struct ethnl_req_info *req_info, 324 const struct ethnl_reply_data *reply_data); 325 int (*fill_reply)(struct sk_buff *skb, 326 const struct ethnl_req_info *req_info, 327 const struct ethnl_reply_data *reply_data); 328 void (*cleanup_data)(struct ethnl_reply_data *reply_data); 329 }; 330 331 /* request handlers */ 332 333 extern const struct ethnl_request_ops ethnl_strset_request_ops; 334 extern const struct ethnl_request_ops ethnl_linkinfo_request_ops; 335 extern const struct ethnl_request_ops ethnl_linkmodes_request_ops; 336 extern const struct ethnl_request_ops ethnl_linkstate_request_ops; 337 extern const struct ethnl_request_ops ethnl_debug_request_ops; 338 extern const struct ethnl_request_ops ethnl_wol_request_ops; 339 extern const struct ethnl_request_ops ethnl_features_request_ops; 340 extern const struct ethnl_request_ops ethnl_privflags_request_ops; 341 extern const struct ethnl_request_ops ethnl_rings_request_ops; 342 extern const struct ethnl_request_ops ethnl_channels_request_ops; 343 extern const struct ethnl_request_ops ethnl_coalesce_request_ops; 344 extern const struct ethnl_request_ops ethnl_pause_request_ops; 345 extern const struct ethnl_request_ops ethnl_eee_request_ops; 346 extern const struct ethnl_request_ops ethnl_tsinfo_request_ops; 347 348 extern const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_FLAGS + 1]; 349 extern const struct nla_policy ethnl_header_policy_stats[ETHTOOL_A_HEADER_FLAGS + 1]; 350 extern const struct nla_policy ethnl_strset_get_policy[ETHTOOL_A_STRSET_COUNTS_ONLY + 1]; 351 extern const struct nla_policy ethnl_linkinfo_get_policy[ETHTOOL_A_LINKINFO_HEADER + 1]; 352 extern const struct nla_policy ethnl_linkinfo_set_policy[ETHTOOL_A_LINKINFO_TP_MDIX_CTRL + 1]; 353 extern const struct nla_policy ethnl_linkmodes_get_policy[ETHTOOL_A_LINKMODES_HEADER + 1]; 354 extern const struct nla_policy ethnl_linkmodes_set_policy[ETHTOOL_A_LINKMODES_LANES + 1]; 355 extern const struct nla_policy ethnl_linkstate_get_policy[ETHTOOL_A_LINKSTATE_HEADER + 1]; 356 extern const struct nla_policy ethnl_debug_get_policy[ETHTOOL_A_DEBUG_HEADER + 1]; 357 extern const struct nla_policy ethnl_debug_set_policy[ETHTOOL_A_DEBUG_MSGMASK + 1]; 358 extern const struct nla_policy ethnl_wol_get_policy[ETHTOOL_A_WOL_HEADER + 1]; 359 extern const struct nla_policy ethnl_wol_set_policy[ETHTOOL_A_WOL_SOPASS + 1]; 360 extern const struct nla_policy ethnl_features_get_policy[ETHTOOL_A_FEATURES_HEADER + 1]; 361 extern const struct nla_policy ethnl_features_set_policy[ETHTOOL_A_FEATURES_WANTED + 1]; 362 extern const struct nla_policy ethnl_privflags_get_policy[ETHTOOL_A_PRIVFLAGS_HEADER + 1]; 363 extern const struct nla_policy ethnl_privflags_set_policy[ETHTOOL_A_PRIVFLAGS_FLAGS + 1]; 364 extern const struct nla_policy ethnl_rings_get_policy[ETHTOOL_A_RINGS_HEADER + 1]; 365 extern const struct nla_policy ethnl_rings_set_policy[ETHTOOL_A_RINGS_TX + 1]; 366 extern const struct nla_policy ethnl_channels_get_policy[ETHTOOL_A_CHANNELS_HEADER + 1]; 367 extern const struct nla_policy ethnl_channels_set_policy[ETHTOOL_A_CHANNELS_COMBINED_COUNT + 1]; 368 extern const struct nla_policy ethnl_coalesce_get_policy[ETHTOOL_A_COALESCE_HEADER + 1]; 369 extern const struct nla_policy ethnl_coalesce_set_policy[ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL + 1]; 370 extern const struct nla_policy ethnl_pause_get_policy[ETHTOOL_A_PAUSE_HEADER + 1]; 371 extern const struct nla_policy ethnl_pause_set_policy[ETHTOOL_A_PAUSE_TX + 1]; 372 extern const struct nla_policy ethnl_eee_get_policy[ETHTOOL_A_EEE_HEADER + 1]; 373 extern const struct nla_policy ethnl_eee_set_policy[ETHTOOL_A_EEE_TX_LPI_TIMER + 1]; 374 extern const struct nla_policy ethnl_tsinfo_get_policy[ETHTOOL_A_TSINFO_HEADER + 1]; 375 extern const struct nla_policy ethnl_cable_test_act_policy[ETHTOOL_A_CABLE_TEST_HEADER + 1]; 376 extern const struct nla_policy ethnl_cable_test_tdr_act_policy[ETHTOOL_A_CABLE_TEST_TDR_CFG + 1]; 377 extern const struct nla_policy ethnl_tunnel_info_get_policy[ETHTOOL_A_TUNNEL_INFO_HEADER + 1]; 378 379 int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info); 380 int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info); 381 int ethnl_set_debug(struct sk_buff *skb, struct genl_info *info); 382 int ethnl_set_wol(struct sk_buff *skb, struct genl_info *info); 383 int ethnl_set_features(struct sk_buff *skb, struct genl_info *info); 384 int ethnl_set_privflags(struct sk_buff *skb, struct genl_info *info); 385 int ethnl_set_rings(struct sk_buff *skb, struct genl_info *info); 386 int ethnl_set_channels(struct sk_buff *skb, struct genl_info *info); 387 int ethnl_set_coalesce(struct sk_buff *skb, struct genl_info *info); 388 int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info); 389 int ethnl_set_eee(struct sk_buff *skb, struct genl_info *info); 390 int ethnl_act_cable_test(struct sk_buff *skb, struct genl_info *info); 391 int ethnl_act_cable_test_tdr(struct sk_buff *skb, struct genl_info *info); 392 int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info); 393 int ethnl_tunnel_info_start(struct netlink_callback *cb); 394 int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb); 395 396 #endif /* _NET_ETHTOOL_NETLINK_H */ 397