1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __NET_NETLINK_H 3#define __NET_NETLINK_H 4 5#include <linux/types.h> 6#include <linux/netlink.h> 7#include <linux/jiffies.h> 8#include <linux/in6.h> 9 10/* ======================================================================== 11 * Netlink Messages and Attributes Interface (As Seen On TV) 12 * ------------------------------------------------------------------------ 13 * Messages Interface 14 * ------------------------------------------------------------------------ 15 * 16 * Message Format: 17 * <--- nlmsg_total_size(payload) ---> 18 * <-- nlmsg_msg_size(payload) -> 19 * +----------+- - -+-------------+- - -+-------- - - 20 * | nlmsghdr | Pad | Payload | Pad | nlmsghdr 21 * +----------+- - -+-------------+- - -+-------- - - 22 * nlmsg_data(nlh)---^ ^ 23 * nlmsg_next(nlh)-----------------------+ 24 * 25 * Payload Format: 26 * <---------------------- nlmsg_len(nlh) ---------------------> 27 * <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) -> 28 * +----------------------+- - -+--------------------------------+ 29 * | Family Header | Pad | Attributes | 30 * +----------------------+- - -+--------------------------------+ 31 * nlmsg_attrdata(nlh, hdrlen)---^ 32 * 33 * Data Structures: 34 * struct nlmsghdr netlink message header 35 * 36 * Message Construction: 37 * nlmsg_new() create a new netlink message 38 * nlmsg_put() add a netlink message to an skb 39 * nlmsg_put_answer() callback based nlmsg_put() 40 * nlmsg_end() finalize netlink message 41 * nlmsg_get_pos() return current position in message 42 * nlmsg_trim() trim part of message 43 * nlmsg_cancel() cancel message construction 44 * nlmsg_free() free a netlink message 45 * 46 * Message Sending: 47 * nlmsg_multicast() multicast message to several groups 48 * nlmsg_unicast() unicast a message to a single socket 49 * nlmsg_notify() send notification message 50 * 51 * Message Length Calculations: 52 * nlmsg_msg_size(payload) length of message w/o padding 53 * nlmsg_total_size(payload) length of message w/ padding 54 * nlmsg_padlen(payload) length of padding at tail 55 * 56 * Message Payload Access: 57 * nlmsg_data(nlh) head of message payload 58 * nlmsg_len(nlh) length of message payload 59 * nlmsg_attrdata(nlh, hdrlen) head of attributes data 60 * nlmsg_attrlen(nlh, hdrlen) length of attributes data 61 * 62 * Message Parsing: 63 * nlmsg_ok(nlh, remaining) does nlh fit into remaining bytes? 64 * nlmsg_next(nlh, remaining) get next netlink message 65 * nlmsg_parse() parse attributes of a message 66 * nlmsg_find_attr() find an attribute in a message 67 * nlmsg_for_each_msg() loop over all messages 68 * nlmsg_validate() validate netlink message incl. attrs 69 * nlmsg_for_each_attr() loop over all attributes 70 * 71 * Misc: 72 * nlmsg_report() report back to application? 73 * 74 * ------------------------------------------------------------------------ 75 * Attributes Interface 76 * ------------------------------------------------------------------------ 77 * 78 * Attribute Format: 79 * <------- nla_total_size(payload) -------> 80 * <---- nla_attr_size(payload) -----> 81 * +----------+- - -+- - - - - - - - - +- - -+-------- - - 82 * | Header | Pad | Payload | Pad | Header 83 * +----------+- - -+- - - - - - - - - +- - -+-------- - - 84 * <- nla_len(nla) -> ^ 85 * nla_data(nla)----^ | 86 * nla_next(nla)-----------------------------' 87 * 88 * Data Structures: 89 * struct nlattr netlink attribute header 90 * 91 * Attribute Construction: 92 * nla_reserve(skb, type, len) reserve room for an attribute 93 * nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr 94 * nla_put(skb, type, len, data) add attribute to skb 95 * nla_put_nohdr(skb, len, data) add attribute w/o hdr 96 * nla_append(skb, len, data) append data to skb 97 * 98 * Attribute Construction for Basic Types: 99 * nla_put_u8(skb, type, value) add u8 attribute to skb 100 * nla_put_u16(skb, type, value) add u16 attribute to skb 101 * nla_put_u32(skb, type, value) add u32 attribute to skb 102 * nla_put_u64_64bit(skb, type, 103 * value, padattr) add u64 attribute to skb 104 * nla_put_s8(skb, type, value) add s8 attribute to skb 105 * nla_put_s16(skb, type, value) add s16 attribute to skb 106 * nla_put_s32(skb, type, value) add s32 attribute to skb 107 * nla_put_s64(skb, type, value, 108 * padattr) add s64 attribute to skb 109 * nla_put_string(skb, type, str) add string attribute to skb 110 * nla_put_flag(skb, type) add flag attribute to skb 111 * nla_put_msecs(skb, type, jiffies, 112 * padattr) add msecs attribute to skb 113 * nla_put_in_addr(skb, type, addr) add IPv4 address attribute to skb 114 * nla_put_in6_addr(skb, type, addr) add IPv6 address attribute to skb 115 * 116 * Nested Attributes Construction: 117 * nla_nest_start(skb, type) start a nested attribute 118 * nla_nest_end(skb, nla) finalize a nested attribute 119 * nla_nest_cancel(skb, nla) cancel nested attribute construction 120 * 121 * Attribute Length Calculations: 122 * nla_attr_size(payload) length of attribute w/o padding 123 * nla_total_size(payload) length of attribute w/ padding 124 * nla_padlen(payload) length of padding 125 * 126 * Attribute Payload Access: 127 * nla_data(nla) head of attribute payload 128 * nla_len(nla) length of attribute payload 129 * 130 * Attribute Payload Access for Basic Types: 131 * nla_get_u8(nla) get payload for a u8 attribute 132 * nla_get_u16(nla) get payload for a u16 attribute 133 * nla_get_u32(nla) get payload for a u32 attribute 134 * nla_get_u64(nla) get payload for a u64 attribute 135 * nla_get_s8(nla) get payload for a s8 attribute 136 * nla_get_s16(nla) get payload for a s16 attribute 137 * nla_get_s32(nla) get payload for a s32 attribute 138 * nla_get_s64(nla) get payload for a s64 attribute 139 * nla_get_flag(nla) return 1 if flag is true 140 * nla_get_msecs(nla) get payload for a msecs attribute 141 * 142 * Attribute Misc: 143 * nla_memcpy(dest, nla, count) copy attribute into memory 144 * nla_memcmp(nla, data, size) compare attribute with memory area 145 * nla_strscpy(dst, nla, size) copy attribute to a sized string 146 * nla_strcmp(nla, str) compare attribute with string 147 * 148 * Attribute Parsing: 149 * nla_ok(nla, remaining) does nla fit into remaining bytes? 150 * nla_next(nla, remaining) get next netlink attribute 151 * nla_validate() validate a stream of attributes 152 * nla_validate_nested() validate a stream of nested attributes 153 * nla_find() find attribute in stream of attributes 154 * nla_find_nested() find attribute in nested attributes 155 * nla_parse() parse and validate stream of attrs 156 * nla_parse_nested() parse nested attributes 157 * nla_for_each_attr() loop over all attributes 158 * nla_for_each_nested() loop over the nested attributes 159 *========================================================================= 160 */ 161 162 /** 163 * Standard attribute types to specify validation policy 164 */ 165enum { 166 NLA_UNSPEC, 167 NLA_U8, 168 NLA_U16, 169 NLA_U32, 170 NLA_U64, 171 NLA_STRING, 172 NLA_FLAG, 173 NLA_MSECS, 174 NLA_NESTED, 175 NLA_NESTED_ARRAY, 176 NLA_NUL_STRING, 177 NLA_BINARY, 178 NLA_S8, 179 NLA_S16, 180 NLA_S32, 181 NLA_S64, 182 NLA_BITFIELD32, 183 NLA_REJECT, 184 NLA_BE16, 185 NLA_BE32, 186 __NLA_TYPE_MAX, 187}; 188 189#define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) 190 191struct netlink_range_validation { 192 u64 min, max; 193}; 194 195struct netlink_range_validation_signed { 196 s64 min, max; 197}; 198 199enum nla_policy_validation { 200 NLA_VALIDATE_NONE, 201 NLA_VALIDATE_RANGE, 202 NLA_VALIDATE_RANGE_WARN_TOO_LONG, 203 NLA_VALIDATE_MIN, 204 NLA_VALIDATE_MAX, 205 NLA_VALIDATE_MASK, 206 NLA_VALIDATE_RANGE_PTR, 207 NLA_VALIDATE_FUNCTION, 208}; 209 210/** 211 * struct nla_policy - attribute validation policy 212 * @type: Type of attribute or NLA_UNSPEC 213 * @validation_type: type of attribute validation done in addition to 214 * type-specific validation (e.g. range, function call), see 215 * &enum nla_policy_validation 216 * @len: Type specific length of payload 217 * 218 * Policies are defined as arrays of this struct, the array must be 219 * accessible by attribute type up to the highest identifier to be expected. 220 * 221 * Meaning of `len' field: 222 * NLA_STRING Maximum length of string 223 * NLA_NUL_STRING Maximum length of string (excluding NUL) 224 * NLA_FLAG Unused 225 * NLA_BINARY Maximum length of attribute payload 226 * (but see also below with the validation type) 227 * NLA_NESTED, 228 * NLA_NESTED_ARRAY Length verification is done by checking len of 229 * nested header (or empty); len field is used if 230 * nested_policy is also used, for the max attr 231 * number in the nested policy. 232 * NLA_U8, NLA_U16, 233 * NLA_U32, NLA_U64, 234 * NLA_S8, NLA_S16, 235 * NLA_S32, NLA_S64, 236 * NLA_BE16, NLA_BE32, 237 * NLA_MSECS Leaving the length field zero will verify the 238 * given type fits, using it verifies minimum length 239 * just like "All other" 240 * NLA_BITFIELD32 Unused 241 * NLA_REJECT Unused 242 * All other Minimum length of attribute payload 243 * 244 * Meaning of validation union: 245 * NLA_BITFIELD32 This is a 32-bit bitmap/bitselector attribute and 246 * `bitfield32_valid' is the u32 value of valid flags 247 * NLA_REJECT This attribute is always rejected and `reject_message' 248 * may point to a string to report as the error instead 249 * of the generic one in extended ACK. 250 * NLA_NESTED `nested_policy' to a nested policy to validate, must 251 * also set `len' to the max attribute number. Use the 252 * provided NLA_POLICY_NESTED() macro. 253 * Note that nla_parse() will validate, but of course not 254 * parse, the nested sub-policies. 255 * NLA_NESTED_ARRAY `nested_policy' points to a nested policy to validate, 256 * must also set `len' to the max attribute number. Use 257 * the provided NLA_POLICY_NESTED_ARRAY() macro. 258 * The difference to NLA_NESTED is the structure: 259 * NLA_NESTED has the nested attributes directly inside 260 * while an array has the nested attributes at another 261 * level down and the attribute types directly in the 262 * nesting don't matter. 263 * NLA_U8, 264 * NLA_U16, 265 * NLA_U32, 266 * NLA_U64, 267 * NLA_BE16, 268 * NLA_BE32, 269 * NLA_S8, 270 * NLA_S16, 271 * NLA_S32, 272 * NLA_S64 The `min' and `max' fields are used depending on the 273 * validation_type field, if that is min/max/range then 274 * the min, max or both are used (respectively) to check 275 * the value of the integer attribute. 276 * Note that in the interest of code simplicity and 277 * struct size both limits are s16, so you cannot 278 * enforce a range that doesn't fall within the range 279 * of s16 - do that using the NLA_POLICY_FULL_RANGE() 280 * or NLA_POLICY_FULL_RANGE_SIGNED() macros instead. 281 * Use the NLA_POLICY_MIN(), NLA_POLICY_MAX() and 282 * NLA_POLICY_RANGE() macros. 283 * NLA_U8, 284 * NLA_U16, 285 * NLA_U32, 286 * NLA_U64 If the validation_type field instead is set to 287 * NLA_VALIDATE_RANGE_PTR, `range' must be a pointer 288 * to a struct netlink_range_validation that indicates 289 * the min/max values. 290 * Use NLA_POLICY_FULL_RANGE(). 291 * NLA_S8, 292 * NLA_S16, 293 * NLA_S32, 294 * NLA_S64 If the validation_type field instead is set to 295 * NLA_VALIDATE_RANGE_PTR, `range_signed' must be a 296 * pointer to a struct netlink_range_validation_signed 297 * that indicates the min/max values. 298 * Use NLA_POLICY_FULL_RANGE_SIGNED(). 299 * 300 * NLA_BINARY If the validation type is like the ones for integers 301 * above, then the min/max length (not value like for 302 * integers) of the attribute is enforced. 303 * 304 * All other Unused - but note that it's a union 305 * 306 * Meaning of `validate' field, use via NLA_POLICY_VALIDATE_FN: 307 * NLA_BINARY Validation function called for the attribute. 308 * All other Unused - but note that it's a union 309 * 310 * Example: 311 * 312 * static const u32 myvalidflags = 0xff231023; 313 * 314 * static const struct nla_policy my_policy[ATTR_MAX+1] = { 315 * [ATTR_FOO] = { .type = NLA_U16 }, 316 * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ }, 317 * [ATTR_BAZ] = NLA_POLICY_EXACT_LEN(sizeof(struct mystruct)), 318 * [ATTR_GOO] = NLA_POLICY_BITFIELD32(myvalidflags), 319 * }; 320 */ 321struct nla_policy { 322 u8 type; 323 u8 validation_type; 324 u16 len; 325 union { 326 /** 327 * @strict_start_type: first attribute to validate strictly 328 * 329 * This entry is special, and used for the attribute at index 0 330 * only, and specifies special data about the policy, namely it 331 * specifies the "boundary type" where strict length validation 332 * starts for any attribute types >= this value, also, strict 333 * nesting validation starts here. 334 * 335 * Additionally, it means that NLA_UNSPEC is actually NLA_REJECT 336 * for any types >= this, so need to use NLA_POLICY_MIN_LEN() to 337 * get the previous pure { .len = xyz } behaviour. The advantage 338 * of this is that types not specified in the policy will be 339 * rejected. 340 * 341 * For completely new families it should be set to 1 so that the 342 * validation is enforced for all attributes. For existing ones 343 * it should be set at least when new attributes are added to 344 * the enum used by the policy, and be set to the new value that 345 * was added to enforce strict validation from thereon. 346 */ 347 u16 strict_start_type; 348 349 /* private: use NLA_POLICY_*() to set */ 350 const u32 bitfield32_valid; 351 const u32 mask; 352 const char *reject_message; 353 const struct nla_policy *nested_policy; 354 struct netlink_range_validation *range; 355 struct netlink_range_validation_signed *range_signed; 356 struct { 357 s16 min, max; 358 }; 359 int (*validate)(const struct nlattr *attr, 360 struct netlink_ext_ack *extack); 361 }; 362}; 363 364#define NLA_POLICY_ETH_ADDR NLA_POLICY_EXACT_LEN(ETH_ALEN) 365#define NLA_POLICY_ETH_ADDR_COMPAT NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN) 366 367#define _NLA_POLICY_NESTED(maxattr, policy) \ 368 { .type = NLA_NESTED, .nested_policy = policy, .len = maxattr } 369#define _NLA_POLICY_NESTED_ARRAY(maxattr, policy) \ 370 { .type = NLA_NESTED_ARRAY, .nested_policy = policy, .len = maxattr } 371#define NLA_POLICY_NESTED(policy) \ 372 _NLA_POLICY_NESTED(ARRAY_SIZE(policy) - 1, policy) 373#define NLA_POLICY_NESTED_ARRAY(policy) \ 374 _NLA_POLICY_NESTED_ARRAY(ARRAY_SIZE(policy) - 1, policy) 375#define NLA_POLICY_BITFIELD32(valid) \ 376 { .type = NLA_BITFIELD32, .bitfield32_valid = valid } 377 378#define __NLA_IS_UINT_TYPE(tp) \ 379 (tp == NLA_U8 || tp == NLA_U16 || tp == NLA_U32 || \ 380 tp == NLA_U64 || tp == NLA_BE16 || tp == NLA_BE32) 381#define __NLA_IS_SINT_TYPE(tp) \ 382 (tp == NLA_S8 || tp == NLA_S16 || tp == NLA_S32 || tp == NLA_S64) 383 384#define __NLA_ENSURE(condition) BUILD_BUG_ON_ZERO(!(condition)) 385#define NLA_ENSURE_UINT_TYPE(tp) \ 386 (__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp)) + tp) 387#define NLA_ENSURE_UINT_OR_BINARY_TYPE(tp) \ 388 (__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp) || \ 389 tp == NLA_MSECS || \ 390 tp == NLA_BINARY) + tp) 391#define NLA_ENSURE_SINT_TYPE(tp) \ 392 (__NLA_ENSURE(__NLA_IS_SINT_TYPE(tp)) + tp) 393#define NLA_ENSURE_INT_OR_BINARY_TYPE(tp) \ 394 (__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp) || \ 395 __NLA_IS_SINT_TYPE(tp) || \ 396 tp == NLA_MSECS || \ 397 tp == NLA_BINARY) + tp) 398#define NLA_ENSURE_NO_VALIDATION_PTR(tp) \ 399 (__NLA_ENSURE(tp != NLA_BITFIELD32 && \ 400 tp != NLA_REJECT && \ 401 tp != NLA_NESTED && \ 402 tp != NLA_NESTED_ARRAY) + tp) 403 404#define NLA_POLICY_RANGE(tp, _min, _max) { \ 405 .type = NLA_ENSURE_INT_OR_BINARY_TYPE(tp), \ 406 .validation_type = NLA_VALIDATE_RANGE, \ 407 .min = _min, \ 408 .max = _max \ 409} 410 411#define NLA_POLICY_FULL_RANGE(tp, _range) { \ 412 .type = NLA_ENSURE_UINT_OR_BINARY_TYPE(tp), \ 413 .validation_type = NLA_VALIDATE_RANGE_PTR, \ 414 .range = _range, \ 415} 416 417#define NLA_POLICY_FULL_RANGE_SIGNED(tp, _range) { \ 418 .type = NLA_ENSURE_SINT_TYPE(tp), \ 419 .validation_type = NLA_VALIDATE_RANGE_PTR, \ 420 .range_signed = _range, \ 421} 422 423#define NLA_POLICY_MIN(tp, _min) { \ 424 .type = NLA_ENSURE_INT_OR_BINARY_TYPE(tp), \ 425 .validation_type = NLA_VALIDATE_MIN, \ 426 .min = _min, \ 427} 428 429#define NLA_POLICY_MAX(tp, _max) { \ 430 .type = NLA_ENSURE_INT_OR_BINARY_TYPE(tp), \ 431 .validation_type = NLA_VALIDATE_MAX, \ 432 .max = _max, \ 433} 434 435#define NLA_POLICY_MASK(tp, _mask) { \ 436 .type = NLA_ENSURE_UINT_TYPE(tp), \ 437 .validation_type = NLA_VALIDATE_MASK, \ 438 .mask = _mask, \ 439} 440 441#define NLA_POLICY_VALIDATE_FN(tp, fn, ...) { \ 442 .type = NLA_ENSURE_NO_VALIDATION_PTR(tp), \ 443 .validation_type = NLA_VALIDATE_FUNCTION, \ 444 .validate = fn, \ 445 .len = __VA_ARGS__ + 0, \ 446} 447 448#define NLA_POLICY_EXACT_LEN(_len) NLA_POLICY_RANGE(NLA_BINARY, _len, _len) 449#define NLA_POLICY_EXACT_LEN_WARN(_len) { \ 450 .type = NLA_BINARY, \ 451 .validation_type = NLA_VALIDATE_RANGE_WARN_TOO_LONG, \ 452 .min = _len, \ 453 .max = _len \ 454} 455#define NLA_POLICY_MIN_LEN(_len) NLA_POLICY_MIN(NLA_BINARY, _len) 456 457/** 458 * struct nl_info - netlink source information 459 * @nlh: Netlink message header of original request 460 * @nl_net: Network namespace 461 * @portid: Netlink PORTID of requesting application 462 * @skip_notify: Skip netlink notifications to user space 463 * @skip_notify_kernel: Skip selected in-kernel notifications 464 */ 465struct nl_info { 466 struct nlmsghdr *nlh; 467 struct net *nl_net; 468 u32 portid; 469 u8 skip_notify:1, 470 skip_notify_kernel:1; 471}; 472 473/** 474 * enum netlink_validation - netlink message/attribute validation levels 475 * @NL_VALIDATE_LIBERAL: Old-style "be liberal" validation, not caring about 476 * extra data at the end of the message, attributes being longer than 477 * they should be, or unknown attributes being present. 478 * @NL_VALIDATE_TRAILING: Reject junk data encountered after attribute parsing. 479 * @NL_VALIDATE_MAXTYPE: Reject attributes > max type; Together with _TRAILING 480 * this is equivalent to the old nla_parse_strict()/nlmsg_parse_strict(). 481 * @NL_VALIDATE_UNSPEC: Reject attributes with NLA_UNSPEC in the policy. 482 * This can safely be set by the kernel when the given policy has no 483 * NLA_UNSPEC anymore, and can thus be used to ensure policy entries 484 * are enforced going forward. 485 * @NL_VALIDATE_STRICT_ATTRS: strict attribute policy parsing (e.g. 486 * U8, U16, U32 must have exact size, etc.) 487 * @NL_VALIDATE_NESTED: Check that NLA_F_NESTED is set for NLA_NESTED(_ARRAY) 488 * and unset for other policies. 489 */ 490enum netlink_validation { 491 NL_VALIDATE_LIBERAL = 0, 492 NL_VALIDATE_TRAILING = BIT(0), 493 NL_VALIDATE_MAXTYPE = BIT(1), 494 NL_VALIDATE_UNSPEC = BIT(2), 495 NL_VALIDATE_STRICT_ATTRS = BIT(3), 496 NL_VALIDATE_NESTED = BIT(4), 497}; 498 499#define NL_VALIDATE_DEPRECATED_STRICT (NL_VALIDATE_TRAILING |\ 500 NL_VALIDATE_MAXTYPE) 501#define NL_VALIDATE_STRICT (NL_VALIDATE_TRAILING |\ 502 NL_VALIDATE_MAXTYPE |\ 503 NL_VALIDATE_UNSPEC |\ 504 NL_VALIDATE_STRICT_ATTRS |\ 505 NL_VALIDATE_NESTED) 506 507int netlink_rcv_skb(struct sk_buff *skb, 508 int (*cb)(struct sk_buff *, struct nlmsghdr *, 509 struct netlink_ext_ack *)); 510int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, 511 unsigned int group, int report, gfp_t flags); 512 513int __nla_validate(const struct nlattr *head, int len, int maxtype, 514 const struct nla_policy *policy, unsigned int validate, 515 struct netlink_ext_ack *extack); 516int __nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head, 517 int len, const struct nla_policy *policy, unsigned int validate, 518 struct netlink_ext_ack *extack); 519int nla_policy_len(const struct nla_policy *, int); 520struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype); 521ssize_t nla_strscpy(char *dst, const struct nlattr *nla, size_t dstsize); 522char *nla_strdup(const struct nlattr *nla, gfp_t flags); 523int nla_memcpy(void *dest, const struct nlattr *src, int count); 524int nla_memcmp(const struct nlattr *nla, const void *data, size_t size); 525int nla_strcmp(const struct nlattr *nla, const char *str); 526struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); 527struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, 528 int attrlen, int padattr); 529void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 530struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); 531struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, 532 int attrlen, int padattr); 533void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 534void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, 535 const void *data); 536void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, 537 const void *data, int padattr); 538void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); 539int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data); 540int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, 541 const void *data, int padattr); 542int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); 543int nla_append(struct sk_buff *skb, int attrlen, const void *data); 544 545/************************************************************************** 546 * Netlink Messages 547 **************************************************************************/ 548 549/** 550 * nlmsg_msg_size - length of netlink message not including padding 551 * @payload: length of message payload 552 */ 553static inline int nlmsg_msg_size(int payload) 554{ 555 return NLMSG_HDRLEN + payload; 556} 557 558/** 559 * nlmsg_total_size - length of netlink message including padding 560 * @payload: length of message payload 561 */ 562static inline int nlmsg_total_size(int payload) 563{ 564 return NLMSG_ALIGN(nlmsg_msg_size(payload)); 565} 566 567/** 568 * nlmsg_padlen - length of padding at the message's tail 569 * @payload: length of message payload 570 */ 571static inline int nlmsg_padlen(int payload) 572{ 573 return nlmsg_total_size(payload) - nlmsg_msg_size(payload); 574} 575 576/** 577 * nlmsg_data - head of message payload 578 * @nlh: netlink message header 579 */ 580static inline void *nlmsg_data(const struct nlmsghdr *nlh) 581{ 582 return (unsigned char *) nlh + NLMSG_HDRLEN; 583} 584 585/** 586 * nlmsg_len - length of message payload 587 * @nlh: netlink message header 588 */ 589static inline int nlmsg_len(const struct nlmsghdr *nlh) 590{ 591 return nlh->nlmsg_len - NLMSG_HDRLEN; 592} 593 594/** 595 * nlmsg_attrdata - head of attributes data 596 * @nlh: netlink message header 597 * @hdrlen: length of family specific header 598 */ 599static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, 600 int hdrlen) 601{ 602 unsigned char *data = nlmsg_data(nlh); 603 return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); 604} 605 606/** 607 * nlmsg_attrlen - length of attributes data 608 * @nlh: netlink message header 609 * @hdrlen: length of family specific header 610 */ 611static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) 612{ 613 return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); 614} 615 616/** 617 * nlmsg_ok - check if the netlink message fits into the remaining bytes 618 * @nlh: netlink message header 619 * @remaining: number of bytes remaining in message stream 620 */ 621static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) 622{ 623 return (remaining >= (int) sizeof(struct nlmsghdr) && 624 nlh->nlmsg_len >= sizeof(struct nlmsghdr) && 625 nlh->nlmsg_len <= remaining); 626} 627 628/** 629 * nlmsg_next - next netlink message in message stream 630 * @nlh: netlink message header 631 * @remaining: number of bytes remaining in message stream 632 * 633 * Returns the next netlink message in the message stream and 634 * decrements remaining by the size of the current message. 635 */ 636static inline struct nlmsghdr * 637nlmsg_next(const struct nlmsghdr *nlh, int *remaining) 638{ 639 int totlen = NLMSG_ALIGN(nlh->nlmsg_len); 640 641 *remaining -= totlen; 642 643 return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); 644} 645 646/** 647 * nla_parse - Parse a stream of attributes into a tb buffer 648 * @tb: destination array with maxtype+1 elements 649 * @maxtype: maximum attribute type to be expected 650 * @head: head of attribute stream 651 * @len: length of attribute stream 652 * @policy: validation policy 653 * @extack: extended ACK pointer 654 * 655 * Parses a stream of attributes and stores a pointer to each attribute in 656 * the tb array accessible via the attribute type. Attributes with a type 657 * exceeding maxtype will be rejected, policy must be specified, attributes 658 * will be validated in the strictest way possible. 659 * 660 * Returns 0 on success or a negative error code. 661 */ 662static inline int nla_parse(struct nlattr **tb, int maxtype, 663 const struct nlattr *head, int len, 664 const struct nla_policy *policy, 665 struct netlink_ext_ack *extack) 666{ 667 return __nla_parse(tb, maxtype, head, len, policy, 668 NL_VALIDATE_STRICT, extack); 669} 670 671/** 672 * nla_parse_deprecated - Parse a stream of attributes into a tb buffer 673 * @tb: destination array with maxtype+1 elements 674 * @maxtype: maximum attribute type to be expected 675 * @head: head of attribute stream 676 * @len: length of attribute stream 677 * @policy: validation policy 678 * @extack: extended ACK pointer 679 * 680 * Parses a stream of attributes and stores a pointer to each attribute in 681 * the tb array accessible via the attribute type. Attributes with a type 682 * exceeding maxtype will be ignored and attributes from the policy are not 683 * always strictly validated (only for new attributes). 684 * 685 * Returns 0 on success or a negative error code. 686 */ 687static inline int nla_parse_deprecated(struct nlattr **tb, int maxtype, 688 const struct nlattr *head, int len, 689 const struct nla_policy *policy, 690 struct netlink_ext_ack *extack) 691{ 692 return __nla_parse(tb, maxtype, head, len, policy, 693 NL_VALIDATE_LIBERAL, extack); 694} 695 696/** 697 * nla_parse_deprecated_strict - Parse a stream of attributes into a tb buffer 698 * @tb: destination array with maxtype+1 elements 699 * @maxtype: maximum attribute type to be expected 700 * @head: head of attribute stream 701 * @len: length of attribute stream 702 * @policy: validation policy 703 * @extack: extended ACK pointer 704 * 705 * Parses a stream of attributes and stores a pointer to each attribute in 706 * the tb array accessible via the attribute type. Attributes with a type 707 * exceeding maxtype will be rejected as well as trailing data, but the 708 * policy is not completely strictly validated (only for new attributes). 709 * 710 * Returns 0 on success or a negative error code. 711 */ 712static inline int nla_parse_deprecated_strict(struct nlattr **tb, int maxtype, 713 const struct nlattr *head, 714 int len, 715 const struct nla_policy *policy, 716 struct netlink_ext_ack *extack) 717{ 718 return __nla_parse(tb, maxtype, head, len, policy, 719 NL_VALIDATE_DEPRECATED_STRICT, extack); 720} 721 722/** 723 * __nlmsg_parse - parse attributes of a netlink message 724 * @nlh: netlink message header 725 * @hdrlen: length of family specific header 726 * @tb: destination array with maxtype+1 elements 727 * @maxtype: maximum attribute type to be expected 728 * @policy: validation policy 729 * @validate: validation strictness 730 * @extack: extended ACK report struct 731 * 732 * See nla_parse() 733 */ 734static inline int __nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, 735 struct nlattr *tb[], int maxtype, 736 const struct nla_policy *policy, 737 unsigned int validate, 738 struct netlink_ext_ack *extack) 739{ 740 if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) { 741 NL_SET_ERR_MSG(extack, "Invalid header length"); 742 return -EINVAL; 743 } 744 745 return __nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), 746 nlmsg_attrlen(nlh, hdrlen), policy, validate, 747 extack); 748} 749 750/** 751 * nlmsg_parse - parse attributes of a netlink message 752 * @nlh: netlink message header 753 * @hdrlen: length of family specific header 754 * @tb: destination array with maxtype+1 elements 755 * @maxtype: maximum attribute type to be expected 756 * @policy: validation policy 757 * @extack: extended ACK report struct 758 * 759 * See nla_parse() 760 */ 761static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, 762 struct nlattr *tb[], int maxtype, 763 const struct nla_policy *policy, 764 struct netlink_ext_ack *extack) 765{ 766 return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy, 767 NL_VALIDATE_STRICT, extack); 768} 769 770/** 771 * nlmsg_parse_deprecated - parse attributes of a netlink message 772 * @nlh: netlink message header 773 * @hdrlen: length of family specific header 774 * @tb: destination array with maxtype+1 elements 775 * @maxtype: maximum attribute type to be expected 776 * @policy: validation policy 777 * @extack: extended ACK report struct 778 * 779 * See nla_parse_deprecated() 780 */ 781static inline int nlmsg_parse_deprecated(const struct nlmsghdr *nlh, int hdrlen, 782 struct nlattr *tb[], int maxtype, 783 const struct nla_policy *policy, 784 struct netlink_ext_ack *extack) 785{ 786 return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy, 787 NL_VALIDATE_LIBERAL, extack); 788} 789 790/** 791 * nlmsg_parse_deprecated_strict - parse attributes of a netlink message 792 * @nlh: netlink message header 793 * @hdrlen: length of family specific header 794 * @tb: destination array with maxtype+1 elements 795 * @maxtype: maximum attribute type to be expected 796 * @policy: validation policy 797 * @extack: extended ACK report struct 798 * 799 * See nla_parse_deprecated_strict() 800 */ 801static inline int 802nlmsg_parse_deprecated_strict(const struct nlmsghdr *nlh, int hdrlen, 803 struct nlattr *tb[], int maxtype, 804 const struct nla_policy *policy, 805 struct netlink_ext_ack *extack) 806{ 807 return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy, 808 NL_VALIDATE_DEPRECATED_STRICT, extack); 809} 810 811/** 812 * nlmsg_find_attr - find a specific attribute in a netlink message 813 * @nlh: netlink message header 814 * @hdrlen: length of familiy specific header 815 * @attrtype: type of attribute to look for 816 * 817 * Returns the first attribute which matches the specified type. 818 */ 819static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh, 820 int hdrlen, int attrtype) 821{ 822 return nla_find(nlmsg_attrdata(nlh, hdrlen), 823 nlmsg_attrlen(nlh, hdrlen), attrtype); 824} 825 826/** 827 * nla_validate_deprecated - Validate a stream of attributes 828 * @head: head of attribute stream 829 * @len: length of attribute stream 830 * @maxtype: maximum attribute type to be expected 831 * @policy: validation policy 832 * @extack: extended ACK report struct 833 * 834 * Validates all attributes in the specified attribute stream against the 835 * specified policy. Validation is done in liberal mode. 836 * See documenation of struct nla_policy for more details. 837 * 838 * Returns 0 on success or a negative error code. 839 */ 840static inline int nla_validate_deprecated(const struct nlattr *head, int len, 841 int maxtype, 842 const struct nla_policy *policy, 843 struct netlink_ext_ack *extack) 844{ 845 return __nla_validate(head, len, maxtype, policy, NL_VALIDATE_LIBERAL, 846 extack); 847} 848 849/** 850 * nla_validate - Validate a stream of attributes 851 * @head: head of attribute stream 852 * @len: length of attribute stream 853 * @maxtype: maximum attribute type to be expected 854 * @policy: validation policy 855 * @extack: extended ACK report struct 856 * 857 * Validates all attributes in the specified attribute stream against the 858 * specified policy. Validation is done in strict mode. 859 * See documenation of struct nla_policy for more details. 860 * 861 * Returns 0 on success or a negative error code. 862 */ 863static inline int nla_validate(const struct nlattr *head, int len, int maxtype, 864 const struct nla_policy *policy, 865 struct netlink_ext_ack *extack) 866{ 867 return __nla_validate(head, len, maxtype, policy, NL_VALIDATE_STRICT, 868 extack); 869} 870 871/** 872 * nlmsg_validate_deprecated - validate a netlink message including attributes 873 * @nlh: netlinket message header 874 * @hdrlen: length of familiy specific header 875 * @maxtype: maximum attribute type to be expected 876 * @policy: validation policy 877 * @extack: extended ACK report struct 878 */ 879static inline int nlmsg_validate_deprecated(const struct nlmsghdr *nlh, 880 int hdrlen, int maxtype, 881 const struct nla_policy *policy, 882 struct netlink_ext_ack *extack) 883{ 884 if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) 885 return -EINVAL; 886 887 return __nla_validate(nlmsg_attrdata(nlh, hdrlen), 888 nlmsg_attrlen(nlh, hdrlen), maxtype, 889 policy, NL_VALIDATE_LIBERAL, extack); 890} 891 892 893 894/** 895 * nlmsg_report - need to report back to application? 896 * @nlh: netlink message header 897 * 898 * Returns 1 if a report back to the application is requested. 899 */ 900static inline int nlmsg_report(const struct nlmsghdr *nlh) 901{ 902 return nlh ? !!(nlh->nlmsg_flags & NLM_F_ECHO) : 0; 903} 904 905/** 906 * nlmsg_seq - return the seq number of netlink message 907 * @nlh: netlink message header 908 * 909 * Returns 0 if netlink message is NULL 910 */ 911static inline u32 nlmsg_seq(const struct nlmsghdr *nlh) 912{ 913 return nlh ? nlh->nlmsg_seq : 0; 914} 915 916/** 917 * nlmsg_for_each_attr - iterate over a stream of attributes 918 * @pos: loop counter, set to current attribute 919 * @nlh: netlink message header 920 * @hdrlen: length of familiy specific header 921 * @rem: initialized to len, holds bytes currently remaining in stream 922 */ 923#define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ 924 nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ 925 nlmsg_attrlen(nlh, hdrlen), rem) 926 927/** 928 * nlmsg_put - Add a new netlink message to an skb 929 * @skb: socket buffer to store message in 930 * @portid: netlink PORTID of requesting application 931 * @seq: sequence number of message 932 * @type: message type 933 * @payload: length of message payload 934 * @flags: message flags 935 * 936 * Returns NULL if the tailroom of the skb is insufficient to store 937 * the message header and payload. 938 */ 939static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, 940 int type, int payload, int flags) 941{ 942 if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) 943 return NULL; 944 945 return __nlmsg_put(skb, portid, seq, type, payload, flags); 946} 947 948/** 949 * nlmsg_append - Add more data to a nlmsg in a skb 950 * @skb: socket buffer to store message in 951 * @size: length of message payload 952 * 953 * Append data to an existing nlmsg, used when constructing a message 954 * with multiple fixed-format headers (which is rare). 955 * Returns NULL if the tailroom of the skb is insufficient to store 956 * the extra payload. 957 */ 958static inline void *nlmsg_append(struct sk_buff *skb, u32 size) 959{ 960 if (unlikely(skb_tailroom(skb) < NLMSG_ALIGN(size))) 961 return NULL; 962 963 if (NLMSG_ALIGN(size) - size) 964 memset(skb_tail_pointer(skb) + size, 0, 965 NLMSG_ALIGN(size) - size); 966 return __skb_put(skb, NLMSG_ALIGN(size)); 967} 968 969/** 970 * nlmsg_put_answer - Add a new callback based netlink message to an skb 971 * @skb: socket buffer to store message in 972 * @cb: netlink callback 973 * @type: message type 974 * @payload: length of message payload 975 * @flags: message flags 976 * 977 * Returns NULL if the tailroom of the skb is insufficient to store 978 * the message header and payload. 979 */ 980static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, 981 struct netlink_callback *cb, 982 int type, int payload, 983 int flags) 984{ 985 return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 986 type, payload, flags); 987} 988 989/** 990 * nlmsg_new - Allocate a new netlink message 991 * @payload: size of the message payload 992 * @flags: the type of memory to allocate. 993 * 994 * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known 995 * and a good default is needed. 996 */ 997static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) 998{ 999 return alloc_skb(nlmsg_total_size(payload), flags); 1000} 1001 1002/** 1003 * nlmsg_end - Finalize a netlink message 1004 * @skb: socket buffer the message is stored in 1005 * @nlh: netlink message header 1006 * 1007 * Corrects the netlink message header to include the appeneded 1008 * attributes. Only necessary if attributes have been added to 1009 * the message. 1010 */ 1011static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) 1012{ 1013 nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; 1014} 1015 1016/** 1017 * nlmsg_get_pos - return current position in netlink message 1018 * @skb: socket buffer the message is stored in 1019 * 1020 * Returns a pointer to the current tail of the message. 1021 */ 1022static inline void *nlmsg_get_pos(struct sk_buff *skb) 1023{ 1024 return skb_tail_pointer(skb); 1025} 1026 1027/** 1028 * nlmsg_trim - Trim message to a mark 1029 * @skb: socket buffer the message is stored in 1030 * @mark: mark to trim to 1031 * 1032 * Trims the message to the provided mark. 1033 */ 1034static inline void nlmsg_trim(struct sk_buff *skb, const void *mark) 1035{ 1036 if (mark) { 1037 WARN_ON((unsigned char *) mark < skb->data); 1038 skb_trim(skb, (unsigned char *) mark - skb->data); 1039 } 1040} 1041 1042/** 1043 * nlmsg_cancel - Cancel construction of a netlink message 1044 * @skb: socket buffer the message is stored in 1045 * @nlh: netlink message header 1046 * 1047 * Removes the complete netlink message including all 1048 * attributes from the socket buffer again. 1049 */ 1050static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) 1051{ 1052 nlmsg_trim(skb, nlh); 1053} 1054 1055/** 1056 * nlmsg_free - free a netlink message 1057 * @skb: socket buffer of netlink message 1058 */ 1059static inline void nlmsg_free(struct sk_buff *skb) 1060{ 1061 kfree_skb(skb); 1062} 1063 1064/** 1065 * nlmsg_multicast - multicast a netlink message 1066 * @sk: netlink socket to spread messages to 1067 * @skb: netlink message as socket buffer 1068 * @portid: own netlink portid to avoid sending to yourself 1069 * @group: multicast group id 1070 * @flags: allocation flags 1071 */ 1072static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, 1073 u32 portid, unsigned int group, gfp_t flags) 1074{ 1075 int err; 1076 1077 NETLINK_CB(skb).dst_group = group; 1078 1079 err = netlink_broadcast(sk, skb, portid, group, flags); 1080 if (err > 0) 1081 err = 0; 1082 1083 return err; 1084} 1085 1086/** 1087 * nlmsg_unicast - unicast a netlink message 1088 * @sk: netlink socket to spread message to 1089 * @skb: netlink message as socket buffer 1090 * @portid: netlink portid of the destination socket 1091 */ 1092static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid) 1093{ 1094 int err; 1095 1096 err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT); 1097 if (err > 0) 1098 err = 0; 1099 1100 return err; 1101} 1102 1103/** 1104 * nlmsg_for_each_msg - iterate over a stream of messages 1105 * @pos: loop counter, set to current message 1106 * @head: head of message stream 1107 * @len: length of message stream 1108 * @rem: initialized to len, holds bytes currently remaining in stream 1109 */ 1110#define nlmsg_for_each_msg(pos, head, len, rem) \ 1111 for (pos = head, rem = len; \ 1112 nlmsg_ok(pos, rem); \ 1113 pos = nlmsg_next(pos, &(rem))) 1114 1115/** 1116 * nl_dump_check_consistent - check if sequence is consistent and advertise if not 1117 * @cb: netlink callback structure that stores the sequence number 1118 * @nlh: netlink message header to write the flag to 1119 * 1120 * This function checks if the sequence (generation) number changed during dump 1121 * and if it did, advertises it in the netlink message header. 1122 * 1123 * The correct way to use it is to set cb->seq to the generation counter when 1124 * all locks for dumping have been acquired, and then call this function for 1125 * each message that is generated. 1126 * 1127 * Note that due to initialisation concerns, 0 is an invalid sequence number 1128 * and must not be used by code that uses this functionality. 1129 */ 1130static inline void 1131nl_dump_check_consistent(struct netlink_callback *cb, 1132 struct nlmsghdr *nlh) 1133{ 1134 if (cb->prev_seq && cb->seq != cb->prev_seq) 1135 nlh->nlmsg_flags |= NLM_F_DUMP_INTR; 1136 cb->prev_seq = cb->seq; 1137} 1138 1139/************************************************************************** 1140 * Netlink Attributes 1141 **************************************************************************/ 1142 1143/** 1144 * nla_attr_size - length of attribute not including padding 1145 * @payload: length of payload 1146 */ 1147static inline int nla_attr_size(int payload) 1148{ 1149 return NLA_HDRLEN + payload; 1150} 1151 1152/** 1153 * nla_total_size - total length of attribute including padding 1154 * @payload: length of payload 1155 */ 1156static inline int nla_total_size(int payload) 1157{ 1158 return NLA_ALIGN(nla_attr_size(payload)); 1159} 1160 1161/** 1162 * nla_padlen - length of padding at the tail of attribute 1163 * @payload: length of payload 1164 */ 1165static inline int nla_padlen(int payload) 1166{ 1167 return nla_total_size(payload) - nla_attr_size(payload); 1168} 1169 1170/** 1171 * nla_type - attribute type 1172 * @nla: netlink attribute 1173 */ 1174static inline int nla_type(const struct nlattr *nla) 1175{ 1176 return nla->nla_type & NLA_TYPE_MASK; 1177} 1178 1179/** 1180 * nla_data - head of payload 1181 * @nla: netlink attribute 1182 */ 1183static inline void *nla_data(const struct nlattr *nla) 1184{ 1185 return (char *) nla + NLA_HDRLEN; 1186} 1187 1188/** 1189 * nla_len - length of payload 1190 * @nla: netlink attribute 1191 */ 1192static inline int nla_len(const struct nlattr *nla) 1193{ 1194 return nla->nla_len - NLA_HDRLEN; 1195} 1196 1197/** 1198 * nla_ok - check if the netlink attribute fits into the remaining bytes 1199 * @nla: netlink attribute 1200 * @remaining: number of bytes remaining in attribute stream 1201 */ 1202static inline int nla_ok(const struct nlattr *nla, int remaining) 1203{ 1204 return remaining >= (int) sizeof(*nla) && 1205 nla->nla_len >= sizeof(*nla) && 1206 nla->nla_len <= remaining; 1207} 1208 1209/** 1210 * nla_next - next netlink attribute in attribute stream 1211 * @nla: netlink attribute 1212 * @remaining: number of bytes remaining in attribute stream 1213 * 1214 * Returns the next netlink attribute in the attribute stream and 1215 * decrements remaining by the size of the current attribute. 1216 */ 1217static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining) 1218{ 1219 unsigned int totlen = NLA_ALIGN(nla->nla_len); 1220 1221 *remaining -= totlen; 1222 return (struct nlattr *) ((char *) nla + totlen); 1223} 1224 1225/** 1226 * nla_find_nested - find attribute in a set of nested attributes 1227 * @nla: attribute containing the nested attributes 1228 * @attrtype: type of attribute to look for 1229 * 1230 * Returns the first attribute which matches the specified type. 1231 */ 1232static inline struct nlattr * 1233nla_find_nested(const struct nlattr *nla, int attrtype) 1234{ 1235 return nla_find(nla_data(nla), nla_len(nla), attrtype); 1236} 1237 1238/** 1239 * nla_parse_nested - parse nested attributes 1240 * @tb: destination array with maxtype+1 elements 1241 * @maxtype: maximum attribute type to be expected 1242 * @nla: attribute containing the nested attributes 1243 * @policy: validation policy 1244 * @extack: extended ACK report struct 1245 * 1246 * See nla_parse() 1247 */ 1248static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, 1249 const struct nlattr *nla, 1250 const struct nla_policy *policy, 1251 struct netlink_ext_ack *extack) 1252{ 1253 if (!(nla->nla_type & NLA_F_NESTED)) { 1254 NL_SET_ERR_MSG_ATTR(extack, nla, "NLA_F_NESTED is missing"); 1255 return -EINVAL; 1256 } 1257 1258 return __nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy, 1259 NL_VALIDATE_STRICT, extack); 1260} 1261 1262/** 1263 * nla_parse_nested_deprecated - parse nested attributes 1264 * @tb: destination array with maxtype+1 elements 1265 * @maxtype: maximum attribute type to be expected 1266 * @nla: attribute containing the nested attributes 1267 * @policy: validation policy 1268 * @extack: extended ACK report struct 1269 * 1270 * See nla_parse_deprecated() 1271 */ 1272static inline int nla_parse_nested_deprecated(struct nlattr *tb[], int maxtype, 1273 const struct nlattr *nla, 1274 const struct nla_policy *policy, 1275 struct netlink_ext_ack *extack) 1276{ 1277 return __nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy, 1278 NL_VALIDATE_LIBERAL, extack); 1279} 1280 1281/** 1282 * nla_put_u8 - Add a u8 netlink attribute to a socket buffer 1283 * @skb: socket buffer to add attribute to 1284 * @attrtype: attribute type 1285 * @value: numeric value 1286 */ 1287static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) 1288{ 1289 /* temporary variables to work around GCC PR81715 with asan-stack=1 */ 1290 u8 tmp = value; 1291 1292 return nla_put(skb, attrtype, sizeof(u8), &tmp); 1293} 1294 1295/** 1296 * nla_put_u16 - Add a u16 netlink attribute to a socket buffer 1297 * @skb: socket buffer to add attribute to 1298 * @attrtype: attribute type 1299 * @value: numeric value 1300 */ 1301static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) 1302{ 1303 u16 tmp = value; 1304 1305 return nla_put(skb, attrtype, sizeof(u16), &tmp); 1306} 1307 1308/** 1309 * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer 1310 * @skb: socket buffer to add attribute to 1311 * @attrtype: attribute type 1312 * @value: numeric value 1313 */ 1314static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value) 1315{ 1316 __be16 tmp = value; 1317 1318 return nla_put(skb, attrtype, sizeof(__be16), &tmp); 1319} 1320 1321/** 1322 * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer 1323 * @skb: socket buffer to add attribute to 1324 * @attrtype: attribute type 1325 * @value: numeric value 1326 */ 1327static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value) 1328{ 1329 __be16 tmp = value; 1330 1331 return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, tmp); 1332} 1333 1334/** 1335 * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer 1336 * @skb: socket buffer to add attribute to 1337 * @attrtype: attribute type 1338 * @value: numeric value 1339 */ 1340static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value) 1341{ 1342 __le16 tmp = value; 1343 1344 return nla_put(skb, attrtype, sizeof(__le16), &tmp); 1345} 1346 1347/** 1348 * nla_put_u32 - Add a u32 netlink attribute to a socket buffer 1349 * @skb: socket buffer to add attribute to 1350 * @attrtype: attribute type 1351 * @value: numeric value 1352 */ 1353static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) 1354{ 1355 u32 tmp = value; 1356 1357 return nla_put(skb, attrtype, sizeof(u32), &tmp); 1358} 1359 1360/** 1361 * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer 1362 * @skb: socket buffer to add attribute to 1363 * @attrtype: attribute type 1364 * @value: numeric value 1365 */ 1366static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value) 1367{ 1368 __be32 tmp = value; 1369 1370 return nla_put(skb, attrtype, sizeof(__be32), &tmp); 1371} 1372 1373/** 1374 * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer 1375 * @skb: socket buffer to add attribute to 1376 * @attrtype: attribute type 1377 * @value: numeric value 1378 */ 1379static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value) 1380{ 1381 __be32 tmp = value; 1382 1383 return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, tmp); 1384} 1385 1386/** 1387 * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer 1388 * @skb: socket buffer to add attribute to 1389 * @attrtype: attribute type 1390 * @value: numeric value 1391 */ 1392static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value) 1393{ 1394 __le32 tmp = value; 1395 1396 return nla_put(skb, attrtype, sizeof(__le32), &tmp); 1397} 1398 1399/** 1400 * nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it 1401 * @skb: socket buffer to add attribute to 1402 * @attrtype: attribute type 1403 * @value: numeric value 1404 * @padattr: attribute type for the padding 1405 */ 1406static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype, 1407 u64 value, int padattr) 1408{ 1409 u64 tmp = value; 1410 1411 return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); 1412} 1413 1414/** 1415 * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it 1416 * @skb: socket buffer to add attribute to 1417 * @attrtype: attribute type 1418 * @value: numeric value 1419 * @padattr: attribute type for the padding 1420 */ 1421static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value, 1422 int padattr) 1423{ 1424 __be64 tmp = value; 1425 1426 return nla_put_64bit(skb, attrtype, sizeof(__be64), &tmp, padattr); 1427} 1428 1429/** 1430 * nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it 1431 * @skb: socket buffer to add attribute to 1432 * @attrtype: attribute type 1433 * @value: numeric value 1434 * @padattr: attribute type for the padding 1435 */ 1436static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value, 1437 int padattr) 1438{ 1439 __be64 tmp = value; 1440 1441 return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, tmp, 1442 padattr); 1443} 1444 1445/** 1446 * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer and align it 1447 * @skb: socket buffer to add attribute to 1448 * @attrtype: attribute type 1449 * @value: numeric value 1450 * @padattr: attribute type for the padding 1451 */ 1452static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value, 1453 int padattr) 1454{ 1455 __le64 tmp = value; 1456 1457 return nla_put_64bit(skb, attrtype, sizeof(__le64), &tmp, padattr); 1458} 1459 1460/** 1461 * nla_put_s8 - Add a s8 netlink attribute to a socket buffer 1462 * @skb: socket buffer to add attribute to 1463 * @attrtype: attribute type 1464 * @value: numeric value 1465 */ 1466static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value) 1467{ 1468 s8 tmp = value; 1469 1470 return nla_put(skb, attrtype, sizeof(s8), &tmp); 1471} 1472 1473/** 1474 * nla_put_s16 - Add a s16 netlink attribute to a socket buffer 1475 * @skb: socket buffer to add attribute to 1476 * @attrtype: attribute type 1477 * @value: numeric value 1478 */ 1479static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value) 1480{ 1481 s16 tmp = value; 1482 1483 return nla_put(skb, attrtype, sizeof(s16), &tmp); 1484} 1485 1486/** 1487 * nla_put_s32 - Add a s32 netlink attribute to a socket buffer 1488 * @skb: socket buffer to add attribute to 1489 * @attrtype: attribute type 1490 * @value: numeric value 1491 */ 1492static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value) 1493{ 1494 s32 tmp = value; 1495 1496 return nla_put(skb, attrtype, sizeof(s32), &tmp); 1497} 1498 1499/** 1500 * nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it 1501 * @skb: socket buffer to add attribute to 1502 * @attrtype: attribute type 1503 * @value: numeric value 1504 * @padattr: attribute type for the padding 1505 */ 1506static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value, 1507 int padattr) 1508{ 1509 s64 tmp = value; 1510 1511 return nla_put_64bit(skb, attrtype, sizeof(s64), &tmp, padattr); 1512} 1513 1514/** 1515 * nla_put_string - Add a string netlink attribute to a socket buffer 1516 * @skb: socket buffer to add attribute to 1517 * @attrtype: attribute type 1518 * @str: NUL terminated string 1519 */ 1520static inline int nla_put_string(struct sk_buff *skb, int attrtype, 1521 const char *str) 1522{ 1523 return nla_put(skb, attrtype, strlen(str) + 1, str); 1524} 1525 1526/** 1527 * nla_put_flag - Add a flag netlink attribute to a socket buffer 1528 * @skb: socket buffer to add attribute to 1529 * @attrtype: attribute type 1530 */ 1531static inline int nla_put_flag(struct sk_buff *skb, int attrtype) 1532{ 1533 return nla_put(skb, attrtype, 0, NULL); 1534} 1535 1536/** 1537 * nla_put_msecs - Add a msecs netlink attribute to a skb and align it 1538 * @skb: socket buffer to add attribute to 1539 * @attrtype: attribute type 1540 * @njiffies: number of jiffies to convert to msecs 1541 * @padattr: attribute type for the padding 1542 */ 1543static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, 1544 unsigned long njiffies, int padattr) 1545{ 1546 u64 tmp = jiffies_to_msecs(njiffies); 1547 1548 return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); 1549} 1550 1551/** 1552 * nla_put_in_addr - Add an IPv4 address netlink attribute to a socket 1553 * buffer 1554 * @skb: socket buffer to add attribute to 1555 * @attrtype: attribute type 1556 * @addr: IPv4 address 1557 */ 1558static inline int nla_put_in_addr(struct sk_buff *skb, int attrtype, 1559 __be32 addr) 1560{ 1561 __be32 tmp = addr; 1562 1563 return nla_put_be32(skb, attrtype, tmp); 1564} 1565 1566/** 1567 * nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket 1568 * buffer 1569 * @skb: socket buffer to add attribute to 1570 * @attrtype: attribute type 1571 * @addr: IPv6 address 1572 */ 1573static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype, 1574 const struct in6_addr *addr) 1575{ 1576 return nla_put(skb, attrtype, sizeof(*addr), addr); 1577} 1578 1579/** 1580 * nla_put_bitfield32 - Add a bitfield32 netlink attribute to a socket buffer 1581 * @skb: socket buffer to add attribute to 1582 * @attrtype: attribute type 1583 * @value: value carrying bits 1584 * @selector: selector of valid bits 1585 */ 1586static inline int nla_put_bitfield32(struct sk_buff *skb, int attrtype, 1587 __u32 value, __u32 selector) 1588{ 1589 struct nla_bitfield32 tmp = { value, selector, }; 1590 1591 return nla_put(skb, attrtype, sizeof(tmp), &tmp); 1592} 1593 1594/** 1595 * nla_get_u32 - return payload of u32 attribute 1596 * @nla: u32 netlink attribute 1597 */ 1598static inline u32 nla_get_u32(const struct nlattr *nla) 1599{ 1600 return *(u32 *) nla_data(nla); 1601} 1602 1603/** 1604 * nla_get_be32 - return payload of __be32 attribute 1605 * @nla: __be32 netlink attribute 1606 */ 1607static inline __be32 nla_get_be32(const struct nlattr *nla) 1608{ 1609 return *(__be32 *) nla_data(nla); 1610} 1611 1612/** 1613 * nla_get_le32 - return payload of __le32 attribute 1614 * @nla: __le32 netlink attribute 1615 */ 1616static inline __le32 nla_get_le32(const struct nlattr *nla) 1617{ 1618 return *(__le32 *) nla_data(nla); 1619} 1620 1621/** 1622 * nla_get_u16 - return payload of u16 attribute 1623 * @nla: u16 netlink attribute 1624 */ 1625static inline u16 nla_get_u16(const struct nlattr *nla) 1626{ 1627 return *(u16 *) nla_data(nla); 1628} 1629 1630/** 1631 * nla_get_be16 - return payload of __be16 attribute 1632 * @nla: __be16 netlink attribute 1633 */ 1634static inline __be16 nla_get_be16(const struct nlattr *nla) 1635{ 1636 return *(__be16 *) nla_data(nla); 1637} 1638 1639/** 1640 * nla_get_le16 - return payload of __le16 attribute 1641 * @nla: __le16 netlink attribute 1642 */ 1643static inline __le16 nla_get_le16(const struct nlattr *nla) 1644{ 1645 return *(__le16 *) nla_data(nla); 1646} 1647 1648/** 1649 * nla_get_u8 - return payload of u8 attribute 1650 * @nla: u8 netlink attribute 1651 */ 1652static inline u8 nla_get_u8(const struct nlattr *nla) 1653{ 1654 return *(u8 *) nla_data(nla); 1655} 1656 1657/** 1658 * nla_get_u64 - return payload of u64 attribute 1659 * @nla: u64 netlink attribute 1660 */ 1661static inline u64 nla_get_u64(const struct nlattr *nla) 1662{ 1663 u64 tmp; 1664 1665 nla_memcpy(&tmp, nla, sizeof(tmp)); 1666 1667 return tmp; 1668} 1669 1670/** 1671 * nla_get_be64 - return payload of __be64 attribute 1672 * @nla: __be64 netlink attribute 1673 */ 1674static inline __be64 nla_get_be64(const struct nlattr *nla) 1675{ 1676 __be64 tmp; 1677 1678 nla_memcpy(&tmp, nla, sizeof(tmp)); 1679 1680 return tmp; 1681} 1682 1683/** 1684 * nla_get_le64 - return payload of __le64 attribute 1685 * @nla: __le64 netlink attribute 1686 */ 1687static inline __le64 nla_get_le64(const struct nlattr *nla) 1688{ 1689 return *(__le64 *) nla_data(nla); 1690} 1691 1692/** 1693 * nla_get_s32 - return payload of s32 attribute 1694 * @nla: s32 netlink attribute 1695 */ 1696static inline s32 nla_get_s32(const struct nlattr *nla) 1697{ 1698 return *(s32 *) nla_data(nla); 1699} 1700 1701/** 1702 * nla_get_s16 - return payload of s16 attribute 1703 * @nla: s16 netlink attribute 1704 */ 1705static inline s16 nla_get_s16(const struct nlattr *nla) 1706{ 1707 return *(s16 *) nla_data(nla); 1708} 1709 1710/** 1711 * nla_get_s8 - return payload of s8 attribute 1712 * @nla: s8 netlink attribute 1713 */ 1714static inline s8 nla_get_s8(const struct nlattr *nla) 1715{ 1716 return *(s8 *) nla_data(nla); 1717} 1718 1719/** 1720 * nla_get_s64 - return payload of s64 attribute 1721 * @nla: s64 netlink attribute 1722 */ 1723static inline s64 nla_get_s64(const struct nlattr *nla) 1724{ 1725 s64 tmp; 1726 1727 nla_memcpy(&tmp, nla, sizeof(tmp)); 1728 1729 return tmp; 1730} 1731 1732/** 1733 * nla_get_flag - return payload of flag attribute 1734 * @nla: flag netlink attribute 1735 */ 1736static inline int nla_get_flag(const struct nlattr *nla) 1737{ 1738 return !!nla; 1739} 1740 1741/** 1742 * nla_get_msecs - return payload of msecs attribute 1743 * @nla: msecs netlink attribute 1744 * 1745 * Returns the number of milliseconds in jiffies. 1746 */ 1747static inline unsigned long nla_get_msecs(const struct nlattr *nla) 1748{ 1749 u64 msecs = nla_get_u64(nla); 1750 1751 return msecs_to_jiffies((unsigned long) msecs); 1752} 1753 1754/** 1755 * nla_get_in_addr - return payload of IPv4 address attribute 1756 * @nla: IPv4 address netlink attribute 1757 */ 1758static inline __be32 nla_get_in_addr(const struct nlattr *nla) 1759{ 1760 return *(__be32 *) nla_data(nla); 1761} 1762 1763/** 1764 * nla_get_in6_addr - return payload of IPv6 address attribute 1765 * @nla: IPv6 address netlink attribute 1766 */ 1767static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla) 1768{ 1769 struct in6_addr tmp; 1770 1771 nla_memcpy(&tmp, nla, sizeof(tmp)); 1772 return tmp; 1773} 1774 1775/** 1776 * nla_get_bitfield32 - return payload of 32 bitfield attribute 1777 * @nla: nla_bitfield32 attribute 1778 */ 1779static inline struct nla_bitfield32 nla_get_bitfield32(const struct nlattr *nla) 1780{ 1781 struct nla_bitfield32 tmp; 1782 1783 nla_memcpy(&tmp, nla, sizeof(tmp)); 1784 return tmp; 1785} 1786 1787/** 1788 * nla_memdup - duplicate attribute memory (kmemdup) 1789 * @src: netlink attribute to duplicate from 1790 * @gfp: GFP mask 1791 */ 1792static inline void *nla_memdup(const struct nlattr *src, gfp_t gfp) 1793{ 1794 return kmemdup(nla_data(src), nla_len(src), gfp); 1795} 1796 1797/** 1798 * nla_nest_start_noflag - Start a new level of nested attributes 1799 * @skb: socket buffer to add attributes to 1800 * @attrtype: attribute type of container 1801 * 1802 * This function exists for backward compatibility to use in APIs which never 1803 * marked their nest attributes with NLA_F_NESTED flag. New APIs should use 1804 * nla_nest_start() which sets the flag. 1805 * 1806 * Returns the container attribute or NULL on error 1807 */ 1808static inline struct nlattr *nla_nest_start_noflag(struct sk_buff *skb, 1809 int attrtype) 1810{ 1811 struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); 1812 1813 if (nla_put(skb, attrtype, 0, NULL) < 0) 1814 return NULL; 1815 1816 return start; 1817} 1818 1819/** 1820 * nla_nest_start - Start a new level of nested attributes, with NLA_F_NESTED 1821 * @skb: socket buffer to add attributes to 1822 * @attrtype: attribute type of container 1823 * 1824 * Unlike nla_nest_start_noflag(), mark the nest attribute with NLA_F_NESTED 1825 * flag. This is the preferred function to use in new code. 1826 * 1827 * Returns the container attribute or NULL on error 1828 */ 1829static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) 1830{ 1831 return nla_nest_start_noflag(skb, attrtype | NLA_F_NESTED); 1832} 1833 1834/** 1835 * nla_nest_end - Finalize nesting of attributes 1836 * @skb: socket buffer the attributes are stored in 1837 * @start: container attribute 1838 * 1839 * Corrects the container attribute header to include the all 1840 * appeneded attributes. 1841 * 1842 * Returns the total data length of the skb. 1843 */ 1844static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) 1845{ 1846 start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; 1847 return skb->len; 1848} 1849 1850/** 1851 * nla_nest_cancel - Cancel nesting of attributes 1852 * @skb: socket buffer the message is stored in 1853 * @start: container attribute 1854 * 1855 * Removes the container attribute and including all nested 1856 * attributes. Returns -EMSGSIZE 1857 */ 1858static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) 1859{ 1860 nlmsg_trim(skb, start); 1861} 1862 1863/** 1864 * __nla_validate_nested - Validate a stream of nested attributes 1865 * @start: container attribute 1866 * @maxtype: maximum attribute type to be expected 1867 * @policy: validation policy 1868 * @validate: validation strictness 1869 * @extack: extended ACK report struct 1870 * 1871 * Validates all attributes in the nested attribute stream against the 1872 * specified policy. Attributes with a type exceeding maxtype will be 1873 * ignored. See documenation of struct nla_policy for more details. 1874 * 1875 * Returns 0 on success or a negative error code. 1876 */ 1877static inline int __nla_validate_nested(const struct nlattr *start, int maxtype, 1878 const struct nla_policy *policy, 1879 unsigned int validate, 1880 struct netlink_ext_ack *extack) 1881{ 1882 return __nla_validate(nla_data(start), nla_len(start), maxtype, policy, 1883 validate, extack); 1884} 1885 1886static inline int 1887nla_validate_nested(const struct nlattr *start, int maxtype, 1888 const struct nla_policy *policy, 1889 struct netlink_ext_ack *extack) 1890{ 1891 return __nla_validate_nested(start, maxtype, policy, 1892 NL_VALIDATE_STRICT, extack); 1893} 1894 1895static inline int 1896nla_validate_nested_deprecated(const struct nlattr *start, int maxtype, 1897 const struct nla_policy *policy, 1898 struct netlink_ext_ack *extack) 1899{ 1900 return __nla_validate_nested(start, maxtype, policy, 1901 NL_VALIDATE_LIBERAL, extack); 1902} 1903 1904/** 1905 * nla_need_padding_for_64bit - test 64-bit alignment of the next attribute 1906 * @skb: socket buffer the message is stored in 1907 * 1908 * Return true if padding is needed to align the next attribute (nla_data()) to 1909 * a 64-bit aligned area. 1910 */ 1911static inline bool nla_need_padding_for_64bit(struct sk_buff *skb) 1912{ 1913#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 1914 /* The nlattr header is 4 bytes in size, that's why we test 1915 * if the skb->data _is_ aligned. A NOP attribute, plus 1916 * nlattr header for next attribute, will make nla_data() 1917 * 8-byte aligned. 1918 */ 1919 if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb), 8)) 1920 return true; 1921#endif 1922 return false; 1923} 1924 1925/** 1926 * nla_align_64bit - 64-bit align the nla_data() of next attribute 1927 * @skb: socket buffer the message is stored in 1928 * @padattr: attribute type for the padding 1929 * 1930 * Conditionally emit a padding netlink attribute in order to make 1931 * the next attribute we emit have a 64-bit aligned nla_data() area. 1932 * This will only be done in architectures which do not have 1933 * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined. 1934 * 1935 * Returns zero on success or a negative error code. 1936 */ 1937static inline int nla_align_64bit(struct sk_buff *skb, int padattr) 1938{ 1939 if (nla_need_padding_for_64bit(skb) && 1940 !nla_reserve(skb, padattr, 0)) 1941 return -EMSGSIZE; 1942 1943 return 0; 1944} 1945 1946/** 1947 * nla_total_size_64bit - total length of attribute including padding 1948 * @payload: length of payload 1949 */ 1950static inline int nla_total_size_64bit(int payload) 1951{ 1952 return NLA_ALIGN(nla_attr_size(payload)) 1953#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 1954 + NLA_ALIGN(nla_attr_size(0)) 1955#endif 1956 ; 1957} 1958 1959/** 1960 * nla_for_each_attr - iterate over a stream of attributes 1961 * @pos: loop counter, set to current attribute 1962 * @head: head of attribute stream 1963 * @len: length of attribute stream 1964 * @rem: initialized to len, holds bytes currently remaining in stream 1965 */ 1966#define nla_for_each_attr(pos, head, len, rem) \ 1967 for (pos = head, rem = len; \ 1968 nla_ok(pos, rem); \ 1969 pos = nla_next(pos, &(rem))) 1970 1971/** 1972 * nla_for_each_nested - iterate over nested attributes 1973 * @pos: loop counter, set to current attribute 1974 * @nla: attribute containing the nested attributes 1975 * @rem: initialized to len, holds bytes currently remaining in stream 1976 */ 1977#define nla_for_each_nested(pos, nla, rem) \ 1978 nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) 1979 1980/** 1981 * nla_is_last - Test if attribute is last in stream 1982 * @nla: attribute to test 1983 * @rem: bytes remaining in stream 1984 */ 1985static inline bool nla_is_last(const struct nlattr *nla, int rem) 1986{ 1987 return nla->nla_len == rem; 1988} 1989 1990void nla_get_range_unsigned(const struct nla_policy *pt, 1991 struct netlink_range_validation *range); 1992void nla_get_range_signed(const struct nla_policy *pt, 1993 struct netlink_range_validation_signed *range); 1994 1995struct netlink_policy_dump_state; 1996 1997int netlink_policy_dump_add_policy(struct netlink_policy_dump_state **pstate, 1998 const struct nla_policy *policy, 1999 unsigned int maxtype); 2000int netlink_policy_dump_get_policy_idx(struct netlink_policy_dump_state *state, 2001 const struct nla_policy *policy, 2002 unsigned int maxtype); 2003bool netlink_policy_dump_loop(struct netlink_policy_dump_state *state); 2004int netlink_policy_dump_write(struct sk_buff *skb, 2005 struct netlink_policy_dump_state *state); 2006int netlink_policy_dump_attr_size_estimate(const struct nla_policy *pt); 2007int netlink_policy_dump_write_attr(struct sk_buff *skb, 2008 const struct nla_policy *pt, 2009 int nestattr); 2010void netlink_policy_dump_free(struct netlink_policy_dump_state *state); 2011 2012#endif 2013