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0001 /* SPDX-License-Identifier: GPL-2.0 */ 0002 #ifndef __NET_NETLINK_H 0003 #define __NET_NETLINK_H 0004 0005 #include <linux/types.h> 0006 #include <linux/netlink.h> 0007 #include <linux/jiffies.h> 0008 #include <linux/in6.h> 0009 0010 /* ======================================================================== 0011 * Netlink Messages and Attributes Interface (As Seen On TV) 0012 * ------------------------------------------------------------------------ 0013 * Messages Interface 0014 * ------------------------------------------------------------------------ 0015 * 0016 * Message Format: 0017 * <--- nlmsg_total_size(payload) ---> 0018 * <-- nlmsg_msg_size(payload) -> 0019 * +----------+- - -+-------------+- - -+-------- - - 0020 * | nlmsghdr | Pad | Payload | Pad | nlmsghdr 0021 * +----------+- - -+-------------+- - -+-------- - - 0022 * nlmsg_data(nlh)---^ ^ 0023 * nlmsg_next(nlh)-----------------------+ 0024 * 0025 * Payload Format: 0026 * <---------------------- nlmsg_len(nlh) ---------------------> 0027 * <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) -> 0028 * +----------------------+- - -+--------------------------------+ 0029 * | Family Header | Pad | Attributes | 0030 * +----------------------+- - -+--------------------------------+ 0031 * nlmsg_attrdata(nlh, hdrlen)---^ 0032 * 0033 * Data Structures: 0034 * struct nlmsghdr netlink message header 0035 * 0036 * Message Construction: 0037 * nlmsg_new() create a new netlink message 0038 * nlmsg_put() add a netlink message to an skb 0039 * nlmsg_put_answer() callback based nlmsg_put() 0040 * nlmsg_end() finalize netlink message 0041 * nlmsg_get_pos() return current position in message 0042 * nlmsg_trim() trim part of message 0043 * nlmsg_cancel() cancel message construction 0044 * nlmsg_free() free a netlink message 0045 * 0046 * Message Sending: 0047 * nlmsg_multicast() multicast message to several groups 0048 * nlmsg_unicast() unicast a message to a single socket 0049 * nlmsg_notify() send notification message 0050 * 0051 * Message Length Calculations: 0052 * nlmsg_msg_size(payload) length of message w/o padding 0053 * nlmsg_total_size(payload) length of message w/ padding 0054 * nlmsg_padlen(payload) length of padding at tail 0055 * 0056 * Message Payload Access: 0057 * nlmsg_data(nlh) head of message payload 0058 * nlmsg_len(nlh) length of message payload 0059 * nlmsg_attrdata(nlh, hdrlen) head of attributes data 0060 * nlmsg_attrlen(nlh, hdrlen) length of attributes data 0061 * 0062 * Message Parsing: 0063 * nlmsg_ok(nlh, remaining) does nlh fit into remaining bytes? 0064 * nlmsg_next(nlh, remaining) get next netlink message 0065 * nlmsg_parse() parse attributes of a message 0066 * nlmsg_find_attr() find an attribute in a message 0067 * nlmsg_for_each_msg() loop over all messages 0068 * nlmsg_validate() validate netlink message incl. attrs 0069 * nlmsg_for_each_attr() loop over all attributes 0070 * 0071 * Misc: 0072 * nlmsg_report() report back to application? 0073 * 0074 * ------------------------------------------------------------------------ 0075 * Attributes Interface 0076 * ------------------------------------------------------------------------ 0077 * 0078 * Attribute Format: 0079 * <------- nla_total_size(payload) -------> 0080 * <---- nla_attr_size(payload) -----> 0081 * +----------+- - -+- - - - - - - - - +- - -+-------- - - 0082 * | Header | Pad | Payload | Pad | Header 0083 * +----------+- - -+- - - - - - - - - +- - -+-------- - - 0084 * <- nla_len(nla) -> ^ 0085 * nla_data(nla)----^ | 0086 * nla_next(nla)-----------------------------' 0087 * 0088 * Data Structures: 0089 * struct nlattr netlink attribute header 0090 * 0091 * Attribute Construction: 0092 * nla_reserve(skb, type, len) reserve room for an attribute 0093 * nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr 0094 * nla_put(skb, type, len, data) add attribute to skb 0095 * nla_put_nohdr(skb, len, data) add attribute w/o hdr 0096 * nla_append(skb, len, data) append data to skb 0097 * 0098 * Attribute Construction for Basic Types: 0099 * nla_put_u8(skb, type, value) add u8 attribute to skb 0100 * nla_put_u16(skb, type, value) add u16 attribute to skb 0101 * nla_put_u32(skb, type, value) add u32 attribute to skb 0102 * nla_put_u64_64bit(skb, type, 0103 * value, padattr) add u64 attribute to skb 0104 * nla_put_s8(skb, type, value) add s8 attribute to skb 0105 * nla_put_s16(skb, type, value) add s16 attribute to skb 0106 * nla_put_s32(skb, type, value) add s32 attribute to skb 0107 * nla_put_s64(skb, type, value, 0108 * padattr) add s64 attribute to skb 0109 * nla_put_string(skb, type, str) add string attribute to skb 0110 * nla_put_flag(skb, type) add flag attribute to skb 0111 * nla_put_msecs(skb, type, jiffies, 0112 * padattr) add msecs attribute to skb 0113 * nla_put_in_addr(skb, type, addr) add IPv4 address attribute to skb 0114 * nla_put_in6_addr(skb, type, addr) add IPv6 address attribute to skb 0115 * 0116 * Nested Attributes Construction: 0117 * nla_nest_start(skb, type) start a nested attribute 0118 * nla_nest_end(skb, nla) finalize a nested attribute 0119 * nla_nest_cancel(skb, nla) cancel nested attribute construction 0120 * 0121 * Attribute Length Calculations: 0122 * nla_attr_size(payload) length of attribute w/o padding 0123 * nla_total_size(payload) length of attribute w/ padding 0124 * nla_padlen(payload) length of padding 0125 * 0126 * Attribute Payload Access: 0127 * nla_data(nla) head of attribute payload 0128 * nla_len(nla) length of attribute payload 0129 * 0130 * Attribute Payload Access for Basic Types: 0131 * nla_get_u8(nla) get payload for a u8 attribute 0132 * nla_get_u16(nla) get payload for a u16 attribute 0133 * nla_get_u32(nla) get payload for a u32 attribute 0134 * nla_get_u64(nla) get payload for a u64 attribute 0135 * nla_get_s8(nla) get payload for a s8 attribute 0136 * nla_get_s16(nla) get payload for a s16 attribute 0137 * nla_get_s32(nla) get payload for a s32 attribute 0138 * nla_get_s64(nla) get payload for a s64 attribute 0139 * nla_get_flag(nla) return 1 if flag is true 0140 * nla_get_msecs(nla) get payload for a msecs attribute 0141 * 0142 * Attribute Misc: 0143 * nla_memcpy(dest, nla, count) copy attribute into memory 0144 * nla_memcmp(nla, data, size) compare attribute with memory area 0145 * nla_strscpy(dst, nla, size) copy attribute to a sized string 0146 * nla_strcmp(nla, str) compare attribute with string 0147 * 0148 * Attribute Parsing: 0149 * nla_ok(nla, remaining) does nla fit into remaining bytes? 0150 * nla_next(nla, remaining) get next netlink attribute 0151 * nla_validate() validate a stream of attributes 0152 * nla_validate_nested() validate a stream of nested attributes 0153 * nla_find() find attribute in stream of attributes 0154 * nla_find_nested() find attribute in nested attributes 0155 * nla_parse() parse and validate stream of attrs 0156 * nla_parse_nested() parse nested attributes 0157 * nla_for_each_attr() loop over all attributes 0158 * nla_for_each_nested() loop over the nested attributes 0159 *========================================================================= 0160 */ 0161 0162 /** 0163 * Standard attribute types to specify validation policy 0164 */ 0165 enum { 0166 NLA_UNSPEC, 0167 NLA_U8, 0168 NLA_U16, 0169 NLA_U32, 0170 NLA_U64, 0171 NLA_STRING, 0172 NLA_FLAG, 0173 NLA_MSECS, 0174 NLA_NESTED, 0175 NLA_NESTED_ARRAY, 0176 NLA_NUL_STRING, 0177 NLA_BINARY, 0178 NLA_S8, 0179 NLA_S16, 0180 NLA_S32, 0181 NLA_S64, 0182 NLA_BITFIELD32, 0183 NLA_REJECT, 0184 __NLA_TYPE_MAX, 0185 }; 0186 0187 #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) 0188 0189 struct netlink_range_validation { 0190 u64 min, max; 0191 }; 0192 0193 struct netlink_range_validation_signed { 0194 s64 min, max; 0195 }; 0196 0197 enum nla_policy_validation { 0198 NLA_VALIDATE_NONE, 0199 NLA_VALIDATE_RANGE, 0200 NLA_VALIDATE_RANGE_WARN_TOO_LONG, 0201 NLA_VALIDATE_MIN, 0202 NLA_VALIDATE_MAX, 0203 NLA_VALIDATE_MASK, 0204 NLA_VALIDATE_RANGE_PTR, 0205 NLA_VALIDATE_FUNCTION, 0206 }; 0207 0208 /** 0209 * struct nla_policy - attribute validation policy 0210 * @type: Type of attribute or NLA_UNSPEC 0211 * @validation_type: type of attribute validation done in addition to 0212 * type-specific validation (e.g. range, function call), see 0213 * &enum nla_policy_validation 0214 * @len: Type specific length of payload 0215 * 0216 * Policies are defined as arrays of this struct, the array must be 0217 * accessible by attribute type up to the highest identifier to be expected. 0218 * 0219 * Meaning of `len' field: 0220 * NLA_STRING Maximum length of string 0221 * NLA_NUL_STRING Maximum length of string (excluding NUL) 0222 * NLA_FLAG Unused 0223 * NLA_BINARY Maximum length of attribute payload 0224 * (but see also below with the validation type) 0225 * NLA_NESTED, 0226 * NLA_NESTED_ARRAY Length verification is done by checking len of 0227 * nested header (or empty); len field is used if 0228 * nested_policy is also used, for the max attr 0229 * number in the nested policy. 0230 * NLA_U8, NLA_U16, 0231 * NLA_U32, NLA_U64, 0232 * NLA_S8, NLA_S16, 0233 * NLA_S32, NLA_S64, 0234 * NLA_MSECS Leaving the length field zero will verify the 0235 * given type fits, using it verifies minimum length 0236 * just like "All other" 0237 * NLA_BITFIELD32 Unused 0238 * NLA_REJECT Unused 0239 * All other Minimum length of attribute payload 0240 * 0241 * Meaning of validation union: 0242 * NLA_BITFIELD32 This is a 32-bit bitmap/bitselector attribute and 0243 * `bitfield32_valid' is the u32 value of valid flags 0244 * NLA_REJECT This attribute is always rejected and `reject_message' 0245 * may point to a string to report as the error instead 0246 * of the generic one in extended ACK. 0247 * NLA_NESTED `nested_policy' to a nested policy to validate, must 0248 * also set `len' to the max attribute number. Use the 0249 * provided NLA_POLICY_NESTED() macro. 0250 * Note that nla_parse() will validate, but of course not 0251 * parse, the nested sub-policies. 0252 * NLA_NESTED_ARRAY `nested_policy' points to a nested policy to validate, 0253 * must also set `len' to the max attribute number. Use 0254 * the provided NLA_POLICY_NESTED_ARRAY() macro. 0255 * The difference to NLA_NESTED is the structure: 0256 * NLA_NESTED has the nested attributes directly inside 0257 * while an array has the nested attributes at another 0258 * level down and the attribute types directly in the 0259 * nesting don't matter. 0260 * NLA_U8, 0261 * NLA_U16, 0262 * NLA_U32, 0263 * NLA_U64, 0264 * NLA_S8, 0265 * NLA_S16, 0266 * NLA_S32, 0267 * NLA_S64 The `min' and `max' fields are used depending on the 0268 * validation_type field, if that is min/max/range then 0269 * the min, max or both are used (respectively) to check 0270 * the value of the integer attribute. 0271 * Note that in the interest of code simplicity and 0272 * struct size both limits are s16, so you cannot 0273 * enforce a range that doesn't fall within the range 0274 * of s16 - do that as usual in the code instead. 0275 * Use the NLA_POLICY_MIN(), NLA_POLICY_MAX() and 0276 * NLA_POLICY_RANGE() macros. 0277 * NLA_U8, 0278 * NLA_U16, 0279 * NLA_U32, 0280 * NLA_U64 If the validation_type field instead is set to 0281 * NLA_VALIDATE_RANGE_PTR, `range' must be a pointer 0282 * to a struct netlink_range_validation that indicates 0283 * the min/max values. 0284 * Use NLA_POLICY_FULL_RANGE(). 0285 * NLA_S8, 0286 * NLA_S16, 0287 * NLA_S32, 0288 * NLA_S64 If the validation_type field instead is set to 0289 * NLA_VALIDATE_RANGE_PTR, `range_signed' must be a 0290 * pointer to a struct netlink_range_validation_signed 0291 * that indicates the min/max values. 0292 * Use NLA_POLICY_FULL_RANGE_SIGNED(). 0293 * 0294 * NLA_BINARY If the validation type is like the ones for integers 0295 * above, then the min/max length (not value like for 0296 * integers) of the attribute is enforced. 0297 * 0298 * All other Unused - but note that it's a union 0299 * 0300 * Meaning of `validate' field, use via NLA_POLICY_VALIDATE_FN: 0301 * NLA_BINARY Validation function called for the attribute. 0302 * All other Unused - but note that it's a union 0303 * 0304 * Example: 0305 * 0306 * static const u32 myvalidflags = 0xff231023; 0307 * 0308 * static const struct nla_policy my_policy[ATTR_MAX+1] = { 0309 * [ATTR_FOO] = { .type = NLA_U16 }, 0310 * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ }, 0311 * [ATTR_BAZ] = NLA_POLICY_EXACT_LEN(sizeof(struct mystruct)), 0312 * [ATTR_GOO] = NLA_POLICY_BITFIELD32(myvalidflags), 0313 * }; 0314 */ 0315 struct nla_policy { 0316 u8 type; 0317 u8 validation_type; 0318 u16 len; 0319 union { 0320 const u32 bitfield32_valid; 0321 const u32 mask; 0322 const char *reject_message; 0323 const struct nla_policy *nested_policy; 0324 struct netlink_range_validation *range; 0325 struct netlink_range_validation_signed *range_signed; 0326 struct { 0327 s16 min, max; 0328 }; 0329 int (*validate)(const struct nlattr *attr, 0330 struct netlink_ext_ack *extack); 0331 /* This entry is special, and used for the attribute at index 0 0332 * only, and specifies special data about the policy, namely it 0333 * specifies the "boundary type" where strict length validation 0334 * starts for any attribute types >= this value, also, strict 0335 * nesting validation starts here. 0336 * 0337 * Additionally, it means that NLA_UNSPEC is actually NLA_REJECT 0338 * for any types >= this, so need to use NLA_POLICY_MIN_LEN() to 0339 * get the previous pure { .len = xyz } behaviour. The advantage 0340 * of this is that types not specified in the policy will be 0341 * rejected. 0342 * 0343 * For completely new families it should be set to 1 so that the 0344 * validation is enforced for all attributes. For existing ones 0345 * it should be set at least when new attributes are added to 0346 * the enum used by the policy, and be set to the new value that 0347 * was added to enforce strict validation from thereon. 0348 */ 0349 u16 strict_start_type; 0350 }; 0351 }; 0352 0353 #define NLA_POLICY_ETH_ADDR NLA_POLICY_EXACT_LEN(ETH_ALEN) 0354 #define NLA_POLICY_ETH_ADDR_COMPAT NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN) 0355 0356 #define _NLA_POLICY_NESTED(maxattr, policy) \ 0357 { .type = NLA_NESTED, .nested_policy = policy, .len = maxattr } 0358 #define _NLA_POLICY_NESTED_ARRAY(maxattr, policy) \ 0359 { .type = NLA_NESTED_ARRAY, .nested_policy = policy, .len = maxattr } 0360 #define NLA_POLICY_NESTED(policy) \ 0361 _NLA_POLICY_NESTED(ARRAY_SIZE(policy) - 1, policy) 0362 #define NLA_POLICY_NESTED_ARRAY(policy) \ 0363 _NLA_POLICY_NESTED_ARRAY(ARRAY_SIZE(policy) - 1, policy) 0364 #define NLA_POLICY_BITFIELD32(valid) \ 0365 { .type = NLA_BITFIELD32, .bitfield32_valid = valid } 0366 0367 #define __NLA_IS_UINT_TYPE(tp) \ 0368 (tp == NLA_U8 || tp == NLA_U16 || tp == NLA_U32 || tp == NLA_U64) 0369 #define __NLA_IS_SINT_TYPE(tp) \ 0370 (tp == NLA_S8 || tp == NLA_S16 || tp == NLA_S32 || tp == NLA_S64) 0371 0372 #define __NLA_ENSURE(condition) BUILD_BUG_ON_ZERO(!(condition)) 0373 #define NLA_ENSURE_UINT_TYPE(tp) \ 0374 (__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp)) + tp) 0375 #define NLA_ENSURE_UINT_OR_BINARY_TYPE(tp) \ 0376 (__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp) || \ 0377 tp == NLA_MSECS || \ 0378 tp == NLA_BINARY) + tp) 0379 #define NLA_ENSURE_SINT_TYPE(tp) \ 0380 (__NLA_ENSURE(__NLA_IS_SINT_TYPE(tp)) + tp) 0381 #define NLA_ENSURE_INT_OR_BINARY_TYPE(tp) \ 0382 (__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp) || \ 0383 __NLA_IS_SINT_TYPE(tp) || \ 0384 tp == NLA_MSECS || \ 0385 tp == NLA_BINARY) + tp) 0386 #define NLA_ENSURE_NO_VALIDATION_PTR(tp) \ 0387 (__NLA_ENSURE(tp != NLA_BITFIELD32 && \ 0388 tp != NLA_REJECT && \ 0389 tp != NLA_NESTED && \ 0390 tp != NLA_NESTED_ARRAY) + tp) 0391 0392 #define NLA_POLICY_RANGE(tp, _min, _max) { \ 0393 .type = NLA_ENSURE_INT_OR_BINARY_TYPE(tp), \ 0394 .validation_type = NLA_VALIDATE_RANGE, \ 0395 .min = _min, \ 0396 .max = _max \ 0397 } 0398 0399 #define NLA_POLICY_FULL_RANGE(tp, _range) { \ 0400 .type = NLA_ENSURE_UINT_OR_BINARY_TYPE(tp), \ 0401 .validation_type = NLA_VALIDATE_RANGE_PTR, \ 0402 .range = _range, \ 0403 } 0404 0405 #define NLA_POLICY_FULL_RANGE_SIGNED(tp, _range) { \ 0406 .type = NLA_ENSURE_SINT_TYPE(tp), \ 0407 .validation_type = NLA_VALIDATE_RANGE_PTR, \ 0408 .range_signed = _range, \ 0409 } 0410 0411 #define NLA_POLICY_MIN(tp, _min) { \ 0412 .type = NLA_ENSURE_INT_OR_BINARY_TYPE(tp), \ 0413 .validation_type = NLA_VALIDATE_MIN, \ 0414 .min = _min, \ 0415 } 0416 0417 #define NLA_POLICY_MAX(tp, _max) { \ 0418 .type = NLA_ENSURE_INT_OR_BINARY_TYPE(tp), \ 0419 .validation_type = NLA_VALIDATE_MAX, \ 0420 .max = _max, \ 0421 } 0422 0423 #define NLA_POLICY_MASK(tp, _mask) { \ 0424 .type = NLA_ENSURE_UINT_TYPE(tp), \ 0425 .validation_type = NLA_VALIDATE_MASK, \ 0426 .mask = _mask, \ 0427 } 0428 0429 #define NLA_POLICY_VALIDATE_FN(tp, fn, ...) { \ 0430 .type = NLA_ENSURE_NO_VALIDATION_PTR(tp), \ 0431 .validation_type = NLA_VALIDATE_FUNCTION, \ 0432 .validate = fn, \ 0433 .len = __VA_ARGS__ + 0, \ 0434 } 0435 0436 #define NLA_POLICY_EXACT_LEN(_len) NLA_POLICY_RANGE(NLA_BINARY, _len, _len) 0437 #define NLA_POLICY_EXACT_LEN_WARN(_len) { \ 0438 .type = NLA_BINARY, \ 0439 .validation_type = NLA_VALIDATE_RANGE_WARN_TOO_LONG, \ 0440 .min = _len, \ 0441 .max = _len \ 0442 } 0443 #define NLA_POLICY_MIN_LEN(_len) NLA_POLICY_MIN(NLA_BINARY, _len) 0444 0445 /** 0446 * struct nl_info - netlink source information 0447 * @nlh: Netlink message header of original request 0448 * @nl_net: Network namespace 0449 * @portid: Netlink PORTID of requesting application 0450 * @skip_notify: Skip netlink notifications to user space 0451 * @skip_notify_kernel: Skip selected in-kernel notifications 0452 */ 0453 struct nl_info { 0454 struct nlmsghdr *nlh; 0455 struct net *nl_net; 0456 u32 portid; 0457 u8 skip_notify:1, 0458 skip_notify_kernel:1; 0459 }; 0460 0461 /** 0462 * enum netlink_validation - netlink message/attribute validation levels 0463 * @NL_VALIDATE_LIBERAL: Old-style "be liberal" validation, not caring about 0464 * extra data at the end of the message, attributes being longer than 0465 * they should be, or unknown attributes being present. 0466 * @NL_VALIDATE_TRAILING: Reject junk data encountered after attribute parsing. 0467 * @NL_VALIDATE_MAXTYPE: Reject attributes > max type; Together with _TRAILING 0468 * this is equivalent to the old nla_parse_strict()/nlmsg_parse_strict(). 0469 * @NL_VALIDATE_UNSPEC: Reject attributes with NLA_UNSPEC in the policy. 0470 * This can safely be set by the kernel when the given policy has no 0471 * NLA_UNSPEC anymore, and can thus be used to ensure policy entries 0472 * are enforced going forward. 0473 * @NL_VALIDATE_STRICT_ATTRS: strict attribute policy parsing (e.g. 0474 * U8, U16, U32 must have exact size, etc.) 0475 * @NL_VALIDATE_NESTED: Check that NLA_F_NESTED is set for NLA_NESTED(_ARRAY) 0476 * and unset for other policies. 0477 */ 0478 enum netlink_validation { 0479 NL_VALIDATE_LIBERAL = 0, 0480 NL_VALIDATE_TRAILING = BIT(0), 0481 NL_VALIDATE_MAXTYPE = BIT(1), 0482 NL_VALIDATE_UNSPEC = BIT(2), 0483 NL_VALIDATE_STRICT_ATTRS = BIT(3), 0484 NL_VALIDATE_NESTED = BIT(4), 0485 }; 0486 0487 #define NL_VALIDATE_DEPRECATED_STRICT (NL_VALIDATE_TRAILING |\ 0488 NL_VALIDATE_MAXTYPE) 0489 #define NL_VALIDATE_STRICT (NL_VALIDATE_TRAILING |\ 0490 NL_VALIDATE_MAXTYPE |\ 0491 NL_VALIDATE_UNSPEC |\ 0492 NL_VALIDATE_STRICT_ATTRS |\ 0493 NL_VALIDATE_NESTED) 0494 0495 int netlink_rcv_skb(struct sk_buff *skb, 0496 int (*cb)(struct sk_buff *, struct nlmsghdr *, 0497 struct netlink_ext_ack *)); 0498 int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, 0499 unsigned int group, int report, gfp_t flags); 0500 0501 int __nla_validate(const struct nlattr *head, int len, int maxtype, 0502 const struct nla_policy *policy, unsigned int validate, 0503 struct netlink_ext_ack *extack); 0504 int __nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head, 0505 int len, const struct nla_policy *policy, unsigned int validate, 0506 struct netlink_ext_ack *extack); 0507 int nla_policy_len(const struct nla_policy *, int); 0508 struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype); 0509 ssize_t nla_strscpy(char *dst, const struct nlattr *nla, size_t dstsize); 0510 char *nla_strdup(const struct nlattr *nla, gfp_t flags); 0511 int nla_memcpy(void *dest, const struct nlattr *src, int count); 0512 int nla_memcmp(const struct nlattr *nla, const void *data, size_t size); 0513 int nla_strcmp(const struct nlattr *nla, const char *str); 0514 struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); 0515 struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, 0516 int attrlen, int padattr); 0517 void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 0518 struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); 0519 struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, 0520 int attrlen, int padattr); 0521 void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 0522 void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, 0523 const void *data); 0524 void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, 0525 const void *data, int padattr); 0526 void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); 0527 int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data); 0528 int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, 0529 const void *data, int padattr); 0530 int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); 0531 int nla_append(struct sk_buff *skb, int attrlen, const void *data); 0532 0533 /************************************************************************** 0534 * Netlink Messages 0535 **************************************************************************/ 0536 0537 /** 0538 * nlmsg_msg_size - length of netlink message not including padding 0539 * @payload: length of message payload 0540 */ 0541 static inline int nlmsg_msg_size(int payload) 0542 { 0543 return NLMSG_HDRLEN + payload; 0544 } 0545 0546 /** 0547 * nlmsg_total_size - length of netlink message including padding 0548 * @payload: length of message payload 0549 */ 0550 static inline int nlmsg_total_size(int payload) 0551 { 0552 return NLMSG_ALIGN(nlmsg_msg_size(payload)); 0553 } 0554 0555 /** 0556 * nlmsg_padlen - length of padding at the message's tail 0557 * @payload: length of message payload 0558 */ 0559 static inline int nlmsg_padlen(int payload) 0560 { 0561 return nlmsg_total_size(payload) - nlmsg_msg_size(payload); 0562 } 0563 0564 /** 0565 * nlmsg_data - head of message payload 0566 * @nlh: netlink message header 0567 */ 0568 static inline void *nlmsg_data(const struct nlmsghdr *nlh) 0569 { 0570 return (unsigned char *) nlh + NLMSG_HDRLEN; 0571 } 0572 0573 /** 0574 * nlmsg_len - length of message payload 0575 * @nlh: netlink message header 0576 */ 0577 static inline int nlmsg_len(const struct nlmsghdr *nlh) 0578 { 0579 return nlh->nlmsg_len - NLMSG_HDRLEN; 0580 } 0581 0582 /** 0583 * nlmsg_attrdata - head of attributes data 0584 * @nlh: netlink message header 0585 * @hdrlen: length of family specific header 0586 */ 0587 static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, 0588 int hdrlen) 0589 { 0590 unsigned char *data = nlmsg_data(nlh); 0591 return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); 0592 } 0593 0594 /** 0595 * nlmsg_attrlen - length of attributes data 0596 * @nlh: netlink message header 0597 * @hdrlen: length of family specific header 0598 */ 0599 static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) 0600 { 0601 return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); 0602 } 0603 0604 /** 0605 * nlmsg_ok - check if the netlink message fits into the remaining bytes 0606 * @nlh: netlink message header 0607 * @remaining: number of bytes remaining in message stream 0608 */ 0609 static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) 0610 { 0611 return (remaining >= (int) sizeof(struct nlmsghdr) && 0612 nlh->nlmsg_len >= sizeof(struct nlmsghdr) && 0613 nlh->nlmsg_len <= remaining); 0614 } 0615 0616 /** 0617 * nlmsg_next - next netlink message in message stream 0618 * @nlh: netlink message header 0619 * @remaining: number of bytes remaining in message stream 0620 * 0621 * Returns the next netlink message in the message stream and 0622 * decrements remaining by the size of the current message. 0623 */ 0624 static inline struct nlmsghdr * 0625 nlmsg_next(const struct nlmsghdr *nlh, int *remaining) 0626 { 0627 int totlen = NLMSG_ALIGN(nlh->nlmsg_len); 0628 0629 *remaining -= totlen; 0630 0631 return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); 0632 } 0633 0634 /** 0635 * nla_parse - Parse a stream of attributes into a tb buffer 0636 * @tb: destination array with maxtype+1 elements 0637 * @maxtype: maximum attribute type to be expected 0638 * @head: head of attribute stream 0639 * @len: length of attribute stream 0640 * @policy: validation policy 0641 * @extack: extended ACK pointer 0642 * 0643 * Parses a stream of attributes and stores a pointer to each attribute in 0644 * the tb array accessible via the attribute type. Attributes with a type 0645 * exceeding maxtype will be rejected, policy must be specified, attributes 0646 * will be validated in the strictest way possible. 0647 * 0648 * Returns 0 on success or a negative error code. 0649 */ 0650 static inline int nla_parse(struct nlattr **tb, int maxtype, 0651 const struct nlattr *head, int len, 0652 const struct nla_policy *policy, 0653 struct netlink_ext_ack *extack) 0654 { 0655 return __nla_parse(tb, maxtype, head, len, policy, 0656 NL_VALIDATE_STRICT, extack); 0657 } 0658 0659 /** 0660 * nla_parse_deprecated - Parse a stream of attributes into a tb buffer 0661 * @tb: destination array with maxtype+1 elements 0662 * @maxtype: maximum attribute type to be expected 0663 * @head: head of attribute stream 0664 * @len: length of attribute stream 0665 * @policy: validation policy 0666 * @extack: extended ACK pointer 0667 * 0668 * Parses a stream of attributes and stores a pointer to each attribute in 0669 * the tb array accessible via the attribute type. Attributes with a type 0670 * exceeding maxtype will be ignored and attributes from the policy are not 0671 * always strictly validated (only for new attributes). 0672 * 0673 * Returns 0 on success or a negative error code. 0674 */ 0675 static inline int nla_parse_deprecated(struct nlattr **tb, int maxtype, 0676 const struct nlattr *head, int len, 0677 const struct nla_policy *policy, 0678 struct netlink_ext_ack *extack) 0679 { 0680 return __nla_parse(tb, maxtype, head, len, policy, 0681 NL_VALIDATE_LIBERAL, extack); 0682 } 0683 0684 /** 0685 * nla_parse_deprecated_strict - Parse a stream of attributes into a tb buffer 0686 * @tb: destination array with maxtype+1 elements 0687 * @maxtype: maximum attribute type to be expected 0688 * @head: head of attribute stream 0689 * @len: length of attribute stream 0690 * @policy: validation policy 0691 * @extack: extended ACK pointer 0692 * 0693 * Parses a stream of attributes and stores a pointer to each attribute in 0694 * the tb array accessible via the attribute type. Attributes with a type 0695 * exceeding maxtype will be rejected as well as trailing data, but the 0696 * policy is not completely strictly validated (only for new attributes). 0697 * 0698 * Returns 0 on success or a negative error code. 0699 */ 0700 static inline int nla_parse_deprecated_strict(struct nlattr **tb, int maxtype, 0701 const struct nlattr *head, 0702 int len, 0703 const struct nla_policy *policy, 0704 struct netlink_ext_ack *extack) 0705 { 0706 return __nla_parse(tb, maxtype, head, len, policy, 0707 NL_VALIDATE_DEPRECATED_STRICT, extack); 0708 } 0709 0710 /** 0711 * __nlmsg_parse - parse attributes of a netlink message 0712 * @nlh: netlink message header 0713 * @hdrlen: length of family specific header 0714 * @tb: destination array with maxtype+1 elements 0715 * @maxtype: maximum attribute type to be expected 0716 * @policy: validation policy 0717 * @validate: validation strictness 0718 * @extack: extended ACK report struct 0719 * 0720 * See nla_parse() 0721 */ 0722 static inline int __nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, 0723 struct nlattr *tb[], int maxtype, 0724 const struct nla_policy *policy, 0725 unsigned int validate, 0726 struct netlink_ext_ack *extack) 0727 { 0728 if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) { 0729 NL_SET_ERR_MSG(extack, "Invalid header length"); 0730 return -EINVAL; 0731 } 0732 0733 return __nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), 0734 nlmsg_attrlen(nlh, hdrlen), policy, validate, 0735 extack); 0736 } 0737 0738 /** 0739 * nlmsg_parse - parse attributes of a netlink message 0740 * @nlh: netlink message header 0741 * @hdrlen: length of family specific header 0742 * @tb: destination array with maxtype+1 elements 0743 * @maxtype: maximum attribute type to be expected 0744 * @extack: extended ACK report struct 0745 * 0746 * See nla_parse() 0747 */ 0748 static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, 0749 struct nlattr *tb[], int maxtype, 0750 const struct nla_policy *policy, 0751 struct netlink_ext_ack *extack) 0752 { 0753 return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy, 0754 NL_VALIDATE_STRICT, extack); 0755 } 0756 0757 /** 0758 * nlmsg_parse_deprecated - parse attributes of a netlink message 0759 * @nlh: netlink message header 0760 * @hdrlen: length of family specific header 0761 * @tb: destination array with maxtype+1 elements 0762 * @maxtype: maximum attribute type to be expected 0763 * @extack: extended ACK report struct 0764 * 0765 * See nla_parse_deprecated() 0766 */ 0767 static inline int nlmsg_parse_deprecated(const struct nlmsghdr *nlh, int hdrlen, 0768 struct nlattr *tb[], int maxtype, 0769 const struct nla_policy *policy, 0770 struct netlink_ext_ack *extack) 0771 { 0772 return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy, 0773 NL_VALIDATE_LIBERAL, extack); 0774 } 0775 0776 /** 0777 * nlmsg_parse_deprecated_strict - parse attributes of a netlink message 0778 * @nlh: netlink message header 0779 * @hdrlen: length of family specific header 0780 * @tb: destination array with maxtype+1 elements 0781 * @maxtype: maximum attribute type to be expected 0782 * @extack: extended ACK report struct 0783 * 0784 * See nla_parse_deprecated_strict() 0785 */ 0786 static inline int 0787 nlmsg_parse_deprecated_strict(const struct nlmsghdr *nlh, int hdrlen, 0788 struct nlattr *tb[], int maxtype, 0789 const struct nla_policy *policy, 0790 struct netlink_ext_ack *extack) 0791 { 0792 return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy, 0793 NL_VALIDATE_DEPRECATED_STRICT, extack); 0794 } 0795 0796 /** 0797 * nlmsg_find_attr - find a specific attribute in a netlink message 0798 * @nlh: netlink message header 0799 * @hdrlen: length of familiy specific header 0800 * @attrtype: type of attribute to look for 0801 * 0802 * Returns the first attribute which matches the specified type. 0803 */ 0804 static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh, 0805 int hdrlen, int attrtype) 0806 { 0807 return nla_find(nlmsg_attrdata(nlh, hdrlen), 0808 nlmsg_attrlen(nlh, hdrlen), attrtype); 0809 } 0810 0811 /** 0812 * nla_validate_deprecated - Validate a stream of attributes 0813 * @head: head of attribute stream 0814 * @len: length of attribute stream 0815 * @maxtype: maximum attribute type to be expected 0816 * @policy: validation policy 0817 * @validate: validation strictness 0818 * @extack: extended ACK report struct 0819 * 0820 * Validates all attributes in the specified attribute stream against the 0821 * specified policy. Validation is done in liberal mode. 0822 * See documenation of struct nla_policy for more details. 0823 * 0824 * Returns 0 on success or a negative error code. 0825 */ 0826 static inline int nla_validate_deprecated(const struct nlattr *head, int len, 0827 int maxtype, 0828 const struct nla_policy *policy, 0829 struct netlink_ext_ack *extack) 0830 { 0831 return __nla_validate(head, len, maxtype, policy, NL_VALIDATE_LIBERAL, 0832 extack); 0833 } 0834 0835 /** 0836 * nla_validate - Validate a stream of attributes 0837 * @head: head of attribute stream 0838 * @len: length of attribute stream 0839 * @maxtype: maximum attribute type to be expected 0840 * @policy: validation policy 0841 * @extack: extended ACK report struct 0842 * 0843 * Validates all attributes in the specified attribute stream against the 0844 * specified policy. Validation is done in strict mode. 0845 * See documenation of struct nla_policy for more details. 0846 * 0847 * Returns 0 on success or a negative error code. 0848 */ 0849 static inline int nla_validate(const struct nlattr *head, int len, int maxtype, 0850 const struct nla_policy *policy, 0851 struct netlink_ext_ack *extack) 0852 { 0853 return __nla_validate(head, len, maxtype, policy, NL_VALIDATE_STRICT, 0854 extack); 0855 } 0856 0857 /** 0858 * nlmsg_validate_deprecated - validate a netlink message including attributes 0859 * @nlh: netlinket message header 0860 * @hdrlen: length of familiy specific header 0861 * @maxtype: maximum attribute type to be expected 0862 * @policy: validation policy 0863 * @extack: extended ACK report struct 0864 */ 0865 static inline int nlmsg_validate_deprecated(const struct nlmsghdr *nlh, 0866 int hdrlen, int maxtype, 0867 const struct nla_policy *policy, 0868 struct netlink_ext_ack *extack) 0869 { 0870 if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) 0871 return -EINVAL; 0872 0873 return __nla_validate(nlmsg_attrdata(nlh, hdrlen), 0874 nlmsg_attrlen(nlh, hdrlen), maxtype, 0875 policy, NL_VALIDATE_LIBERAL, extack); 0876 } 0877 0878 0879 0880 /** 0881 * nlmsg_report - need to report back to application? 0882 * @nlh: netlink message header 0883 * 0884 * Returns 1 if a report back to the application is requested. 0885 */ 0886 static inline int nlmsg_report(const struct nlmsghdr *nlh) 0887 { 0888 return nlh ? !!(nlh->nlmsg_flags & NLM_F_ECHO) : 0; 0889 } 0890 0891 /** 0892 * nlmsg_for_each_attr - iterate over a stream of attributes 0893 * @pos: loop counter, set to current attribute 0894 * @nlh: netlink message header 0895 * @hdrlen: length of familiy specific header 0896 * @rem: initialized to len, holds bytes currently remaining in stream 0897 */ 0898 #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ 0899 nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ 0900 nlmsg_attrlen(nlh, hdrlen), rem) 0901 0902 /** 0903 * nlmsg_put - Add a new netlink message to an skb 0904 * @skb: socket buffer to store message in 0905 * @portid: netlink PORTID of requesting application 0906 * @seq: sequence number of message 0907 * @type: message type 0908 * @payload: length of message payload 0909 * @flags: message flags 0910 * 0911 * Returns NULL if the tailroom of the skb is insufficient to store 0912 * the message header and payload. 0913 */ 0914 static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, 0915 int type, int payload, int flags) 0916 { 0917 if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) 0918 return NULL; 0919 0920 return __nlmsg_put(skb, portid, seq, type, payload, flags); 0921 } 0922 0923 /** 0924 * nlmsg_put_answer - Add a new callback based netlink message to an skb 0925 * @skb: socket buffer to store message in 0926 * @cb: netlink callback 0927 * @type: message type 0928 * @payload: length of message payload 0929 * @flags: message flags 0930 * 0931 * Returns NULL if the tailroom of the skb is insufficient to store 0932 * the message header and payload. 0933 */ 0934 static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, 0935 struct netlink_callback *cb, 0936 int type, int payload, 0937 int flags) 0938 { 0939 return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 0940 type, payload, flags); 0941 } 0942 0943 /** 0944 * nlmsg_new - Allocate a new netlink message 0945 * @payload: size of the message payload 0946 * @flags: the type of memory to allocate. 0947 * 0948 * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known 0949 * and a good default is needed. 0950 */ 0951 static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) 0952 { 0953 return alloc_skb(nlmsg_total_size(payload), flags); 0954 } 0955 0956 /** 0957 * nlmsg_end - Finalize a netlink message 0958 * @skb: socket buffer the message is stored in 0959 * @nlh: netlink message header 0960 * 0961 * Corrects the netlink message header to include the appeneded 0962 * attributes. Only necessary if attributes have been added to 0963 * the message. 0964 */ 0965 static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) 0966 { 0967 nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; 0968 } 0969 0970 /** 0971 * nlmsg_get_pos - return current position in netlink message 0972 * @skb: socket buffer the message is stored in 0973 * 0974 * Returns a pointer to the current tail of the message. 0975 */ 0976 static inline void *nlmsg_get_pos(struct sk_buff *skb) 0977 { 0978 return skb_tail_pointer(skb); 0979 } 0980 0981 /** 0982 * nlmsg_trim - Trim message to a mark 0983 * @skb: socket buffer the message is stored in 0984 * @mark: mark to trim to 0985 * 0986 * Trims the message to the provided mark. 0987 */ 0988 static inline void nlmsg_trim(struct sk_buff *skb, const void *mark) 0989 { 0990 if (mark) { 0991 WARN_ON((unsigned char *) mark < skb->data); 0992 skb_trim(skb, (unsigned char *) mark - skb->data); 0993 } 0994 } 0995 0996 /** 0997 * nlmsg_cancel - Cancel construction of a netlink message 0998 * @skb: socket buffer the message is stored in 0999 * @nlh: netlink message header 1000 * 1001 * Removes the complete netlink message including all 1002 * attributes from the socket buffer again. 1003 */ 1004 static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) 1005 { 1006 nlmsg_trim(skb, nlh); 1007 } 1008 1009 /** 1010 * nlmsg_free - free a netlink message 1011 * @skb: socket buffer of netlink message 1012 */ 1013 static inline void nlmsg_free(struct sk_buff *skb) 1014 { 1015 kfree_skb(skb); 1016 } 1017 1018 /** 1019 * nlmsg_multicast - multicast a netlink message 1020 * @sk: netlink socket to spread messages to 1021 * @skb: netlink message as socket buffer 1022 * @portid: own netlink portid to avoid sending to yourself 1023 * @group: multicast group id 1024 * @flags: allocation flags 1025 */ 1026 static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, 1027 u32 portid, unsigned int group, gfp_t flags) 1028 { 1029 int err; 1030 1031 NETLINK_CB(skb).dst_group = group; 1032 1033 err = netlink_broadcast(sk, skb, portid, group, flags); 1034 if (err > 0) 1035 err = 0; 1036 1037 return err; 1038 } 1039 1040 /** 1041 * nlmsg_unicast - unicast a netlink message 1042 * @sk: netlink socket to spread message to 1043 * @skb: netlink message as socket buffer 1044 * @portid: netlink portid of the destination socket 1045 */ 1046 static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid) 1047 { 1048 int err; 1049 1050 err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT); 1051 if (err > 0) 1052 err = 0; 1053 1054 return err; 1055 } 1056 1057 /** 1058 * nlmsg_for_each_msg - iterate over a stream of messages 1059 * @pos: loop counter, set to current message 1060 * @head: head of message stream 1061 * @len: length of message stream 1062 * @rem: initialized to len, holds bytes currently remaining in stream 1063 */ 1064 #define nlmsg_for_each_msg(pos, head, len, rem) \ 1065 for (pos = head, rem = len; \ 1066 nlmsg_ok(pos, rem); \ 1067 pos = nlmsg_next(pos, &(rem))) 1068 1069 /** 1070 * nl_dump_check_consistent - check if sequence is consistent and advertise if not 1071 * @cb: netlink callback structure that stores the sequence number 1072 * @nlh: netlink message header to write the flag to 1073 * 1074 * This function checks if the sequence (generation) number changed during dump 1075 * and if it did, advertises it in the netlink message header. 1076 * 1077 * The correct way to use it is to set cb->seq to the generation counter when 1078 * all locks for dumping have been acquired, and then call this function for 1079 * each message that is generated. 1080 * 1081 * Note that due to initialisation concerns, 0 is an invalid sequence number 1082 * and must not be used by code that uses this functionality. 1083 */ 1084 static inline void 1085 nl_dump_check_consistent(struct netlink_callback *cb, 1086 struct nlmsghdr *nlh) 1087 { 1088 if (cb->prev_seq && cb->seq != cb->prev_seq) 1089 nlh->nlmsg_flags |= NLM_F_DUMP_INTR; 1090 cb->prev_seq = cb->seq; 1091 } 1092 1093 /************************************************************************** 1094 * Netlink Attributes 1095 **************************************************************************/ 1096 1097 /** 1098 * nla_attr_size - length of attribute not including padding 1099 * @payload: length of payload 1100 */ 1101 static inline int nla_attr_size(int payload) 1102 { 1103 return NLA_HDRLEN + payload; 1104 } 1105 1106 /** 1107 * nla_total_size - total length of attribute including padding 1108 * @payload: length of payload 1109 */ 1110 static inline int nla_total_size(int payload) 1111 { 1112 return NLA_ALIGN(nla_attr_size(payload)); 1113 } 1114 1115 /** 1116 * nla_padlen - length of padding at the tail of attribute 1117 * @payload: length of payload 1118 */ 1119 static inline int nla_padlen(int payload) 1120 { 1121 return nla_total_size(payload) - nla_attr_size(payload); 1122 } 1123 1124 /** 1125 * nla_type - attribute type 1126 * @nla: netlink attribute 1127 */ 1128 static inline int nla_type(const struct nlattr *nla) 1129 { 1130 return nla->nla_type & NLA_TYPE_MASK; 1131 } 1132 1133 /** 1134 * nla_data - head of payload 1135 * @nla: netlink attribute 1136 */ 1137 static inline void *nla_data(const struct nlattr *nla) 1138 { 1139 return (char *) nla + NLA_HDRLEN; 1140 } 1141 1142 /** 1143 * nla_len - length of payload 1144 * @nla: netlink attribute 1145 */ 1146 static inline int nla_len(const struct nlattr *nla) 1147 { 1148 return nla->nla_len - NLA_HDRLEN; 1149 } 1150 1151 /** 1152 * nla_ok - check if the netlink attribute fits into the remaining bytes 1153 * @nla: netlink attribute 1154 * @remaining: number of bytes remaining in attribute stream 1155 */ 1156 static inline int nla_ok(const struct nlattr *nla, int remaining) 1157 { 1158 return remaining >= (int) sizeof(*nla) && 1159 nla->nla_len >= sizeof(*nla) && 1160 nla->nla_len <= remaining; 1161 } 1162 1163 /** 1164 * nla_next - next netlink attribute in attribute stream 1165 * @nla: netlink attribute 1166 * @remaining: number of bytes remaining in attribute stream 1167 * 1168 * Returns the next netlink attribute in the attribute stream and 1169 * decrements remaining by the size of the current attribute. 1170 */ 1171 static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining) 1172 { 1173 unsigned int totlen = NLA_ALIGN(nla->nla_len); 1174 1175 *remaining -= totlen; 1176 return (struct nlattr *) ((char *) nla + totlen); 1177 } 1178 1179 /** 1180 * nla_find_nested - find attribute in a set of nested attributes 1181 * @nla: attribute containing the nested attributes 1182 * @attrtype: type of attribute to look for 1183 * 1184 * Returns the first attribute which matches the specified type. 1185 */ 1186 static inline struct nlattr * 1187 nla_find_nested(const struct nlattr *nla, int attrtype) 1188 { 1189 return nla_find(nla_data(nla), nla_len(nla), attrtype); 1190 } 1191 1192 /** 1193 * nla_parse_nested - parse nested attributes 1194 * @tb: destination array with maxtype+1 elements 1195 * @maxtype: maximum attribute type to be expected 1196 * @nla: attribute containing the nested attributes 1197 * @policy: validation policy 1198 * @extack: extended ACK report struct 1199 * 1200 * See nla_parse() 1201 */ 1202 static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, 1203 const struct nlattr *nla, 1204 const struct nla_policy *policy, 1205 struct netlink_ext_ack *extack) 1206 { 1207 if (!(nla->nla_type & NLA_F_NESTED)) { 1208 NL_SET_ERR_MSG_ATTR(extack, nla, "NLA_F_NESTED is missing"); 1209 return -EINVAL; 1210 } 1211 1212 return __nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy, 1213 NL_VALIDATE_STRICT, extack); 1214 } 1215 1216 /** 1217 * nla_parse_nested_deprecated - parse nested attributes 1218 * @tb: destination array with maxtype+1 elements 1219 * @maxtype: maximum attribute type to be expected 1220 * @nla: attribute containing the nested attributes 1221 * @policy: validation policy 1222 * @extack: extended ACK report struct 1223 * 1224 * See nla_parse_deprecated() 1225 */ 1226 static inline int nla_parse_nested_deprecated(struct nlattr *tb[], int maxtype, 1227 const struct nlattr *nla, 1228 const struct nla_policy *policy, 1229 struct netlink_ext_ack *extack) 1230 { 1231 return __nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy, 1232 NL_VALIDATE_LIBERAL, extack); 1233 } 1234 1235 /** 1236 * nla_put_u8 - Add a u8 netlink attribute to a socket buffer 1237 * @skb: socket buffer to add attribute to 1238 * @attrtype: attribute type 1239 * @value: numeric value 1240 */ 1241 static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) 1242 { 1243 /* temporary variables to work around GCC PR81715 with asan-stack=1 */ 1244 u8 tmp = value; 1245 1246 return nla_put(skb, attrtype, sizeof(u8), &tmp); 1247 } 1248 1249 /** 1250 * nla_put_u16 - Add a u16 netlink attribute to a socket buffer 1251 * @skb: socket buffer to add attribute to 1252 * @attrtype: attribute type 1253 * @value: numeric value 1254 */ 1255 static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) 1256 { 1257 u16 tmp = value; 1258 1259 return nla_put(skb, attrtype, sizeof(u16), &tmp); 1260 } 1261 1262 /** 1263 * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer 1264 * @skb: socket buffer to add attribute to 1265 * @attrtype: attribute type 1266 * @value: numeric value 1267 */ 1268 static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value) 1269 { 1270 __be16 tmp = value; 1271 1272 return nla_put(skb, attrtype, sizeof(__be16), &tmp); 1273 } 1274 1275 /** 1276 * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer 1277 * @skb: socket buffer to add attribute to 1278 * @attrtype: attribute type 1279 * @value: numeric value 1280 */ 1281 static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value) 1282 { 1283 __be16 tmp = value; 1284 1285 return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, tmp); 1286 } 1287 1288 /** 1289 * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer 1290 * @skb: socket buffer to add attribute to 1291 * @attrtype: attribute type 1292 * @value: numeric value 1293 */ 1294 static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value) 1295 { 1296 __le16 tmp = value; 1297 1298 return nla_put(skb, attrtype, sizeof(__le16), &tmp); 1299 } 1300 1301 /** 1302 * nla_put_u32 - Add a u32 netlink attribute to a socket buffer 1303 * @skb: socket buffer to add attribute to 1304 * @attrtype: attribute type 1305 * @value: numeric value 1306 */ 1307 static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) 1308 { 1309 u32 tmp = value; 1310 1311 return nla_put(skb, attrtype, sizeof(u32), &tmp); 1312 } 1313 1314 /** 1315 * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer 1316 * @skb: socket buffer to add attribute to 1317 * @attrtype: attribute type 1318 * @value: numeric value 1319 */ 1320 static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value) 1321 { 1322 __be32 tmp = value; 1323 1324 return nla_put(skb, attrtype, sizeof(__be32), &tmp); 1325 } 1326 1327 /** 1328 * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer 1329 * @skb: socket buffer to add attribute to 1330 * @attrtype: attribute type 1331 * @value: numeric value 1332 */ 1333 static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value) 1334 { 1335 __be32 tmp = value; 1336 1337 return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, tmp); 1338 } 1339 1340 /** 1341 * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer 1342 * @skb: socket buffer to add attribute to 1343 * @attrtype: attribute type 1344 * @value: numeric value 1345 */ 1346 static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value) 1347 { 1348 __le32 tmp = value; 1349 1350 return nla_put(skb, attrtype, sizeof(__le32), &tmp); 1351 } 1352 1353 /** 1354 * nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it 1355 * @skb: socket buffer to add attribute to 1356 * @attrtype: attribute type 1357 * @value: numeric value 1358 * @padattr: attribute type for the padding 1359 */ 1360 static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype, 1361 u64 value, int padattr) 1362 { 1363 u64 tmp = value; 1364 1365 return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); 1366 } 1367 1368 /** 1369 * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it 1370 * @skb: socket buffer to add attribute to 1371 * @attrtype: attribute type 1372 * @value: numeric value 1373 * @padattr: attribute type for the padding 1374 */ 1375 static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value, 1376 int padattr) 1377 { 1378 __be64 tmp = value; 1379 1380 return nla_put_64bit(skb, attrtype, sizeof(__be64), &tmp, padattr); 1381 } 1382 1383 /** 1384 * nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it 1385 * @skb: socket buffer to add attribute to 1386 * @attrtype: attribute type 1387 * @value: numeric value 1388 * @padattr: attribute type for the padding 1389 */ 1390 static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value, 1391 int padattr) 1392 { 1393 __be64 tmp = value; 1394 1395 return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, tmp, 1396 padattr); 1397 } 1398 1399 /** 1400 * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer 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 */ 1406 static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value, 1407 int padattr) 1408 { 1409 __le64 tmp = value; 1410 1411 return nla_put_64bit(skb, attrtype, sizeof(__le64), &tmp, padattr); 1412 } 1413 1414 /** 1415 * nla_put_s8 - Add a s8 netlink attribute to a socket buffer 1416 * @skb: socket buffer to add attribute to 1417 * @attrtype: attribute type 1418 * @value: numeric value 1419 */ 1420 static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value) 1421 { 1422 s8 tmp = value; 1423 1424 return nla_put(skb, attrtype, sizeof(s8), &tmp); 1425 } 1426 1427 /** 1428 * nla_put_s16 - Add a s16 netlink attribute to a socket buffer 1429 * @skb: socket buffer to add attribute to 1430 * @attrtype: attribute type 1431 * @value: numeric value 1432 */ 1433 static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value) 1434 { 1435 s16 tmp = value; 1436 1437 return nla_put(skb, attrtype, sizeof(s16), &tmp); 1438 } 1439 1440 /** 1441 * nla_put_s32 - Add a s32 netlink attribute to a socket buffer 1442 * @skb: socket buffer to add attribute to 1443 * @attrtype: attribute type 1444 * @value: numeric value 1445 */ 1446 static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value) 1447 { 1448 s32 tmp = value; 1449 1450 return nla_put(skb, attrtype, sizeof(s32), &tmp); 1451 } 1452 1453 /** 1454 * nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it 1455 * @skb: socket buffer to add attribute to 1456 * @attrtype: attribute type 1457 * @value: numeric value 1458 * @padattr: attribute type for the padding 1459 */ 1460 static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value, 1461 int padattr) 1462 { 1463 s64 tmp = value; 1464 1465 return nla_put_64bit(skb, attrtype, sizeof(s64), &tmp, padattr); 1466 } 1467 1468 /** 1469 * nla_put_string - Add a string netlink attribute to a socket buffer 1470 * @skb: socket buffer to add attribute to 1471 * @attrtype: attribute type 1472 * @str: NUL terminated string 1473 */ 1474 static inline int nla_put_string(struct sk_buff *skb, int attrtype, 1475 const char *str) 1476 { 1477 return nla_put(skb, attrtype, strlen(str) + 1, str); 1478 } 1479 1480 /** 1481 * nla_put_flag - Add a flag netlink attribute to a socket buffer 1482 * @skb: socket buffer to add attribute to 1483 * @attrtype: attribute type 1484 */ 1485 static inline int nla_put_flag(struct sk_buff *skb, int attrtype) 1486 { 1487 return nla_put(skb, attrtype, 0, NULL); 1488 } 1489 1490 /** 1491 * nla_put_msecs - Add a msecs netlink attribute to a skb and align it 1492 * @skb: socket buffer to add attribute to 1493 * @attrtype: attribute type 1494 * @njiffies: number of jiffies to convert to msecs 1495 * @padattr: attribute type for the padding 1496 */ 1497 static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, 1498 unsigned long njiffies, int padattr) 1499 { 1500 u64 tmp = jiffies_to_msecs(njiffies); 1501 1502 return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); 1503 } 1504 1505 /** 1506 * nla_put_in_addr - Add an IPv4 address netlink attribute to a socket 1507 * buffer 1508 * @skb: socket buffer to add attribute to 1509 * @attrtype: attribute type 1510 * @addr: IPv4 address 1511 */ 1512 static inline int nla_put_in_addr(struct sk_buff *skb, int attrtype, 1513 __be32 addr) 1514 { 1515 __be32 tmp = addr; 1516 1517 return nla_put_be32(skb, attrtype, tmp); 1518 } 1519 1520 /** 1521 * nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket 1522 * buffer 1523 * @skb: socket buffer to add attribute to 1524 * @attrtype: attribute type 1525 * @addr: IPv6 address 1526 */ 1527 static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype, 1528 const struct in6_addr *addr) 1529 { 1530 return nla_put(skb, attrtype, sizeof(*addr), addr); 1531 } 1532 1533 /** 1534 * nla_put_bitfield32 - Add a bitfield32 netlink attribute to a socket buffer 1535 * @skb: socket buffer to add attribute to 1536 * @attrtype: attribute type 1537 * @value: value carrying bits 1538 * @selector: selector of valid bits 1539 */ 1540 static inline int nla_put_bitfield32(struct sk_buff *skb, int attrtype, 1541 __u32 value, __u32 selector) 1542 { 1543 struct nla_bitfield32 tmp = { value, selector, }; 1544 1545 return nla_put(skb, attrtype, sizeof(tmp), &tmp); 1546 } 1547 1548 /** 1549 * nla_get_u32 - return payload of u32 attribute 1550 * @nla: u32 netlink attribute 1551 */ 1552 static inline u32 nla_get_u32(const struct nlattr *nla) 1553 { 1554 return *(u32 *) nla_data(nla); 1555 } 1556 1557 /** 1558 * nla_get_be32 - return payload of __be32 attribute 1559 * @nla: __be32 netlink attribute 1560 */ 1561 static inline __be32 nla_get_be32(const struct nlattr *nla) 1562 { 1563 return *(__be32 *) nla_data(nla); 1564 } 1565 1566 /** 1567 * nla_get_le32 - return payload of __le32 attribute 1568 * @nla: __le32 netlink attribute 1569 */ 1570 static inline __le32 nla_get_le32(const struct nlattr *nla) 1571 { 1572 return *(__le32 *) nla_data(nla); 1573 } 1574 1575 /** 1576 * nla_get_u16 - return payload of u16 attribute 1577 * @nla: u16 netlink attribute 1578 */ 1579 static inline u16 nla_get_u16(const struct nlattr *nla) 1580 { 1581 return *(u16 *) nla_data(nla); 1582 } 1583 1584 /** 1585 * nla_get_be16 - return payload of __be16 attribute 1586 * @nla: __be16 netlink attribute 1587 */ 1588 static inline __be16 nla_get_be16(const struct nlattr *nla) 1589 { 1590 return *(__be16 *) nla_data(nla); 1591 } 1592 1593 /** 1594 * nla_get_le16 - return payload of __le16 attribute 1595 * @nla: __le16 netlink attribute 1596 */ 1597 static inline __le16 nla_get_le16(const struct nlattr *nla) 1598 { 1599 return *(__le16 *) nla_data(nla); 1600 } 1601 1602 /** 1603 * nla_get_u8 - return payload of u8 attribute 1604 * @nla: u8 netlink attribute 1605 */ 1606 static inline u8 nla_get_u8(const struct nlattr *nla) 1607 { 1608 return *(u8 *) nla_data(nla); 1609 } 1610 1611 /** 1612 * nla_get_u64 - return payload of u64 attribute 1613 * @nla: u64 netlink attribute 1614 */ 1615 static inline u64 nla_get_u64(const struct nlattr *nla) 1616 { 1617 u64 tmp; 1618 1619 nla_memcpy(&tmp, nla, sizeof(tmp)); 1620 1621 return tmp; 1622 } 1623 1624 /** 1625 * nla_get_be64 - return payload of __be64 attribute 1626 * @nla: __be64 netlink attribute 1627 */ 1628 static inline __be64 nla_get_be64(const struct nlattr *nla) 1629 { 1630 __be64 tmp; 1631 1632 nla_memcpy(&tmp, nla, sizeof(tmp)); 1633 1634 return tmp; 1635 } 1636 1637 /** 1638 * nla_get_le64 - return payload of __le64 attribute 1639 * @nla: __le64 netlink attribute 1640 */ 1641 static inline __le64 nla_get_le64(const struct nlattr *nla) 1642 { 1643 return *(__le64 *) nla_data(nla); 1644 } 1645 1646 /** 1647 * nla_get_s32 - return payload of s32 attribute 1648 * @nla: s32 netlink attribute 1649 */ 1650 static inline s32 nla_get_s32(const struct nlattr *nla) 1651 { 1652 return *(s32 *) nla_data(nla); 1653 } 1654 1655 /** 1656 * nla_get_s16 - return payload of s16 attribute 1657 * @nla: s16 netlink attribute 1658 */ 1659 static inline s16 nla_get_s16(const struct nlattr *nla) 1660 { 1661 return *(s16 *) nla_data(nla); 1662 } 1663 1664 /** 1665 * nla_get_s8 - return payload of s8 attribute 1666 * @nla: s8 netlink attribute 1667 */ 1668 static inline s8 nla_get_s8(const struct nlattr *nla) 1669 { 1670 return *(s8 *) nla_data(nla); 1671 } 1672 1673 /** 1674 * nla_get_s64 - return payload of s64 attribute 1675 * @nla: s64 netlink attribute 1676 */ 1677 static inline s64 nla_get_s64(const struct nlattr *nla) 1678 { 1679 s64 tmp; 1680 1681 nla_memcpy(&tmp, nla, sizeof(tmp)); 1682 1683 return tmp; 1684 } 1685 1686 /** 1687 * nla_get_flag - return payload of flag attribute 1688 * @nla: flag netlink attribute 1689 */ 1690 static inline int nla_get_flag(const struct nlattr *nla) 1691 { 1692 return !!nla; 1693 } 1694 1695 /** 1696 * nla_get_msecs - return payload of msecs attribute 1697 * @nla: msecs netlink attribute 1698 * 1699 * Returns the number of milliseconds in jiffies. 1700 */ 1701 static inline unsigned long nla_get_msecs(const struct nlattr *nla) 1702 { 1703 u64 msecs = nla_get_u64(nla); 1704 1705 return msecs_to_jiffies((unsigned long) msecs); 1706 } 1707 1708 /** 1709 * nla_get_in_addr - return payload of IPv4 address attribute 1710 * @nla: IPv4 address netlink attribute 1711 */ 1712 static inline __be32 nla_get_in_addr(const struct nlattr *nla) 1713 { 1714 return *(__be32 *) nla_data(nla); 1715 } 1716 1717 /** 1718 * nla_get_in6_addr - return payload of IPv6 address attribute 1719 * @nla: IPv6 address netlink attribute 1720 */ 1721 static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla) 1722 { 1723 struct in6_addr tmp; 1724 1725 nla_memcpy(&tmp, nla, sizeof(tmp)); 1726 return tmp; 1727 } 1728 1729 /** 1730 * nla_get_bitfield32 - return payload of 32 bitfield attribute 1731 * @nla: nla_bitfield32 attribute 1732 */ 1733 static inline struct nla_bitfield32 nla_get_bitfield32(const struct nlattr *nla) 1734 { 1735 struct nla_bitfield32 tmp; 1736 1737 nla_memcpy(&tmp, nla, sizeof(tmp)); 1738 return tmp; 1739 } 1740 1741 /** 1742 * nla_memdup - duplicate attribute memory (kmemdup) 1743 * @src: netlink attribute to duplicate from 1744 * @gfp: GFP mask 1745 */ 1746 static inline void *nla_memdup(const struct nlattr *src, gfp_t gfp) 1747 { 1748 return kmemdup(nla_data(src), nla_len(src), gfp); 1749 } 1750 1751 /** 1752 * nla_nest_start_noflag - Start a new level of nested attributes 1753 * @skb: socket buffer to add attributes to 1754 * @attrtype: attribute type of container 1755 * 1756 * This function exists for backward compatibility to use in APIs which never 1757 * marked their nest attributes with NLA_F_NESTED flag. New APIs should use 1758 * nla_nest_start() which sets the flag. 1759 * 1760 * Returns the container attribute or NULL on error 1761 */ 1762 static inline struct nlattr *nla_nest_start_noflag(struct sk_buff *skb, 1763 int attrtype) 1764 { 1765 struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); 1766 1767 if (nla_put(skb, attrtype, 0, NULL) < 0) 1768 return NULL; 1769 1770 return start; 1771 } 1772 1773 /** 1774 * nla_nest_start - Start a new level of nested attributes, with NLA_F_NESTED 1775 * @skb: socket buffer to add attributes to 1776 * @attrtype: attribute type of container 1777 * 1778 * Unlike nla_nest_start_noflag(), mark the nest attribute with NLA_F_NESTED 1779 * flag. This is the preferred function to use in new code. 1780 * 1781 * Returns the container attribute or NULL on error 1782 */ 1783 static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) 1784 { 1785 return nla_nest_start_noflag(skb, attrtype | NLA_F_NESTED); 1786 } 1787 1788 /** 1789 * nla_nest_end - Finalize nesting of attributes 1790 * @skb: socket buffer the attributes are stored in 1791 * @start: container attribute 1792 * 1793 * Corrects the container attribute header to include the all 1794 * appeneded attributes. 1795 * 1796 * Returns the total data length of the skb. 1797 */ 1798 static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) 1799 { 1800 start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; 1801 return skb->len; 1802 } 1803 1804 /** 1805 * nla_nest_cancel - Cancel nesting of attributes 1806 * @skb: socket buffer the message is stored in 1807 * @start: container attribute 1808 * 1809 * Removes the container attribute and including all nested 1810 * attributes. Returns -EMSGSIZE 1811 */ 1812 static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) 1813 { 1814 nlmsg_trim(skb, start); 1815 } 1816 1817 /** 1818 * __nla_validate_nested - Validate a stream of nested attributes 1819 * @start: container attribute 1820 * @maxtype: maximum attribute type to be expected 1821 * @policy: validation policy 1822 * @validate: validation strictness 1823 * @extack: extended ACK report struct 1824 * 1825 * Validates all attributes in the nested attribute stream against the 1826 * specified policy. Attributes with a type exceeding maxtype will be 1827 * ignored. See documenation of struct nla_policy for more details. 1828 * 1829 * Returns 0 on success or a negative error code. 1830 */ 1831 static inline int __nla_validate_nested(const struct nlattr *start, int maxtype, 1832 const struct nla_policy *policy, 1833 unsigned int validate, 1834 struct netlink_ext_ack *extack) 1835 { 1836 return __nla_validate(nla_data(start), nla_len(start), maxtype, policy, 1837 validate, extack); 1838 } 1839 1840 static inline int 1841 nla_validate_nested(const struct nlattr *start, int maxtype, 1842 const struct nla_policy *policy, 1843 struct netlink_ext_ack *extack) 1844 { 1845 return __nla_validate_nested(start, maxtype, policy, 1846 NL_VALIDATE_STRICT, extack); 1847 } 1848 1849 static inline int 1850 nla_validate_nested_deprecated(const struct nlattr *start, int maxtype, 1851 const struct nla_policy *policy, 1852 struct netlink_ext_ack *extack) 1853 { 1854 return __nla_validate_nested(start, maxtype, policy, 1855 NL_VALIDATE_LIBERAL, extack); 1856 } 1857 1858 /** 1859 * nla_need_padding_for_64bit - test 64-bit alignment of the next attribute 1860 * @skb: socket buffer the message is stored in 1861 * 1862 * Return true if padding is needed to align the next attribute (nla_data()) to 1863 * a 64-bit aligned area. 1864 */ 1865 static inline bool nla_need_padding_for_64bit(struct sk_buff *skb) 1866 { 1867 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 1868 /* The nlattr header is 4 bytes in size, that's why we test 1869 * if the skb->data _is_ aligned. A NOP attribute, plus 1870 * nlattr header for next attribute, will make nla_data() 1871 * 8-byte aligned. 1872 */ 1873 if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb), 8)) 1874 return true; 1875 #endif 1876 return false; 1877 } 1878 1879 /** 1880 * nla_align_64bit - 64-bit align the nla_data() of next attribute 1881 * @skb: socket buffer the message is stored in 1882 * @padattr: attribute type for the padding 1883 * 1884 * Conditionally emit a padding netlink attribute in order to make 1885 * the next attribute we emit have a 64-bit aligned nla_data() area. 1886 * This will only be done in architectures which do not have 1887 * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined. 1888 * 1889 * Returns zero on success or a negative error code. 1890 */ 1891 static inline int nla_align_64bit(struct sk_buff *skb, int padattr) 1892 { 1893 if (nla_need_padding_for_64bit(skb) && 1894 !nla_reserve(skb, padattr, 0)) 1895 return -EMSGSIZE; 1896 1897 return 0; 1898 } 1899 1900 /** 1901 * nla_total_size_64bit - total length of attribute including padding 1902 * @payload: length of payload 1903 */ 1904 static inline int nla_total_size_64bit(int payload) 1905 { 1906 return NLA_ALIGN(nla_attr_size(payload)) 1907 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 1908 + NLA_ALIGN(nla_attr_size(0)) 1909 #endif 1910 ; 1911 } 1912 1913 /** 1914 * nla_for_each_attr - iterate over a stream of attributes 1915 * @pos: loop counter, set to current attribute 1916 * @head: head of attribute stream 1917 * @len: length of attribute stream 1918 * @rem: initialized to len, holds bytes currently remaining in stream 1919 */ 1920 #define nla_for_each_attr(pos, head, len, rem) \ 1921 for (pos = head, rem = len; \ 1922 nla_ok(pos, rem); \ 1923 pos = nla_next(pos, &(rem))) 1924 1925 /** 1926 * nla_for_each_nested - iterate over nested attributes 1927 * @pos: loop counter, set to current attribute 1928 * @nla: attribute containing the nested attributes 1929 * @rem: initialized to len, holds bytes currently remaining in stream 1930 */ 1931 #define nla_for_each_nested(pos, nla, rem) \ 1932 nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) 1933 1934 /** 1935 * nla_is_last - Test if attribute is last in stream 1936 * @nla: attribute to test 1937 * @rem: bytes remaining in stream 1938 */ 1939 static inline bool nla_is_last(const struct nlattr *nla, int rem) 1940 { 1941 return nla->nla_len == rem; 1942 } 1943 1944 void nla_get_range_unsigned(const struct nla_policy *pt, 1945 struct netlink_range_validation *range); 1946 void nla_get_range_signed(const struct nla_policy *pt, 1947 struct netlink_range_validation_signed *range); 1948 1949 struct netlink_policy_dump_state; 1950 1951 int netlink_policy_dump_add_policy(struct netlink_policy_dump_state **pstate, 1952 const struct nla_policy *policy, 1953 unsigned int maxtype); 1954 int netlink_policy_dump_get_policy_idx(struct netlink_policy_dump_state *state, 1955 const struct nla_policy *policy, 1956 unsigned int maxtype); 1957 bool netlink_policy_dump_loop(struct netlink_policy_dump_state *state); 1958 int netlink_policy_dump_write(struct sk_buff *skb, 1959 struct netlink_policy_dump_state *state); 1960 int netlink_policy_dump_attr_size_estimate(const struct nla_policy *pt); 1961 int netlink_policy_dump_write_attr(struct sk_buff *skb, 1962 const struct nla_policy *pt, 1963 int nestattr); 1964 void netlink_policy_dump_free(struct netlink_policy_dump_state *state); 1965 1966 #endif
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