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TOMOYO Linux Cross Reference
Linux/include/net/netlink.h

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  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_strlcpy(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   */
165 enum {
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_EXACT_LEN,
185         NLA_EXACT_LEN_WARN,
186         NLA_MIN_LEN,
187         __NLA_TYPE_MAX,
188 };
189 
190 #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1)
191 
192 enum nla_policy_validation {
193         NLA_VALIDATE_NONE,
194         NLA_VALIDATE_RANGE,
195         NLA_VALIDATE_MIN,
196         NLA_VALIDATE_MAX,
197         NLA_VALIDATE_FUNCTION,
198 };
199 
200 /**
201  * struct nla_policy - attribute validation policy
202  * @type: Type of attribute or NLA_UNSPEC
203  * @validation_type: type of attribute validation done in addition to
204  *      type-specific validation (e.g. range, function call), see
205  *      &enum nla_policy_validation
206  * @len: Type specific length of payload
207  *
208  * Policies are defined as arrays of this struct, the array must be
209  * accessible by attribute type up to the highest identifier to be expected.
210  *
211  * Meaning of `len' field:
212  *    NLA_STRING           Maximum length of string
213  *    NLA_NUL_STRING       Maximum length of string (excluding NUL)
214  *    NLA_FLAG             Unused
215  *    NLA_BINARY           Maximum length of attribute payload
216  *    NLA_MIN_LEN          Minimum length of attribute payload
217  *    NLA_NESTED,
218  *    NLA_NESTED_ARRAY     Length verification is done by checking len of
219  *                         nested header (or empty); len field is used if
220  *                         validation_data is also used, for the max attr
221  *                         number in the nested policy.
222  *    NLA_U8, NLA_U16,
223  *    NLA_U32, NLA_U64,
224  *    NLA_S8, NLA_S16,
225  *    NLA_S32, NLA_S64,
226  *    NLA_MSECS            Leaving the length field zero will verify the
227  *                         given type fits, using it verifies minimum length
228  *                         just like "All other"
229  *    NLA_BITFIELD32       Unused
230  *    NLA_REJECT           Unused
231  *    NLA_EXACT_LEN        Attribute must have exactly this length, otherwise
232  *                         it is rejected.
233  *    NLA_EXACT_LEN_WARN   Attribute should have exactly this length, a warning
234  *                         is logged if it is longer, shorter is rejected.
235  *    NLA_MIN_LEN          Minimum length of attribute payload
236  *    All other            Minimum length of attribute payload
237  *
238  * Meaning of `validation_data' field:
239  *    NLA_BITFIELD32       This is a 32-bit bitmap/bitselector attribute and
240  *                         validation data must point to a u32 value of valid
241  *                         flags
242  *    NLA_REJECT           This attribute is always rejected and validation data
243  *                         may point to a string to report as the error instead
244  *                         of the generic one in extended ACK.
245  *    NLA_NESTED           Points to a nested policy to validate, must also set
246  *                         `len' to the max attribute number.
247  *                         Note that nla_parse() will validate, but of course not
248  *                         parse, the nested sub-policies.
249  *    NLA_NESTED_ARRAY     Points to a nested policy to validate, must also set
250  *                         `len' to the max attribute number. The difference to
251  *                         NLA_NESTED is the structure - NLA_NESTED has the
252  *                         nested attributes directly inside, while an array has
253  *                         the nested attributes at another level down and the
254  *                         attributes directly in the nesting don't matter.
255  *    All other            Unused - but note that it's a union
256  *
257  * Meaning of `min' and `max' fields, use via NLA_POLICY_MIN, NLA_POLICY_MAX
258  * and NLA_POLICY_RANGE:
259  *    NLA_U8,
260  *    NLA_U16,
261  *    NLA_U32,
262  *    NLA_U64,
263  *    NLA_S8,
264  *    NLA_S16,
265  *    NLA_S32,
266  *    NLA_S64              These are used depending on the validation_type
267  *                         field, if that is min/max/range then the minimum,
268  *                         maximum and both are used (respectively) to check
269  *                         the value of the integer attribute.
270  *                         Note that in the interest of code simplicity and
271  *                         struct size both limits are s16, so you cannot
272  *                         enforce a range that doesn't fall within the range
273  *                         of s16 - do that as usual in the code instead.
274  *    All other            Unused - but note that it's a union
275  *
276  * Meaning of `validate' field, use via NLA_POLICY_VALIDATE_FN:
277  *    NLA_BINARY           Validation function called for the attribute,
278  *                         not compatible with use of the validation_data
279  *                         as in NLA_BITFIELD32, NLA_REJECT, NLA_NESTED and
280  *                         NLA_NESTED_ARRAY.
281  *    All other            Unused - but note that it's a union
282  *
283  * Example:
284  * static const struct nla_policy my_policy[ATTR_MAX+1] = {
285  *      [ATTR_FOO] = { .type = NLA_U16 },
286  *      [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ },
287  *      [ATTR_BAZ] = { .type = NLA_EXACT_LEN, .len = sizeof(struct mystruct) },
288  *      [ATTR_GOO] = { .type = NLA_BITFIELD32, .validation_data = &myvalidflags },
289  * };
290  */
291 struct nla_policy {
292         u8              type;
293         u8              validation_type;
294         u16             len;
295         union {
296                 const void *validation_data;
297                 struct {
298                         s16 min, max;
299                 };
300                 int (*validate)(const struct nlattr *attr,
301                                 struct netlink_ext_ack *extack);
302                 /* This entry is special, and used for the attribute at index 0
303                  * only, and specifies special data about the policy, namely it
304                  * specifies the "boundary type" where strict length validation
305                  * starts for any attribute types >= this value, also, strict
306                  * nesting validation starts here.
307                  *
308                  * Additionally, it means that NLA_UNSPEC is actually NLA_REJECT
309                  * for any types >= this, so need to use NLA_MIN_LEN to get the
310                  * previous pure { .len = xyz } behaviour. The advantage of this
311                  * is that types not specified in the policy will be rejected.
312                  *
313                  * For completely new families it should be set to 1 so that the
314                  * validation is enforced for all attributes. For existing ones
315                  * it should be set at least when new attributes are added to
316                  * the enum used by the policy, and be set to the new value that
317                  * was added to enforce strict validation from thereon.
318                  */
319                 u16 strict_start_type;
320         };
321 };
322 
323 #define NLA_POLICY_EXACT_LEN(_len)      { .type = NLA_EXACT_LEN, .len = _len }
324 #define NLA_POLICY_EXACT_LEN_WARN(_len) { .type = NLA_EXACT_LEN_WARN, \
325                                           .len = _len }
326 #define NLA_POLICY_MIN_LEN(_len)        { .type = NLA_MIN_LEN, .len = _len }
327 
328 #define NLA_POLICY_ETH_ADDR             NLA_POLICY_EXACT_LEN(ETH_ALEN)
329 #define NLA_POLICY_ETH_ADDR_COMPAT      NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN)
330 
331 #define _NLA_POLICY_NESTED(maxattr, policy) \
332         { .type = NLA_NESTED, .validation_data = policy, .len = maxattr }
333 #define _NLA_POLICY_NESTED_ARRAY(maxattr, policy) \
334         { .type = NLA_NESTED_ARRAY, .validation_data = policy, .len = maxattr }
335 #define NLA_POLICY_NESTED(policy) \
336         _NLA_POLICY_NESTED(ARRAY_SIZE(policy) - 1, policy)
337 #define NLA_POLICY_NESTED_ARRAY(policy) \
338         _NLA_POLICY_NESTED_ARRAY(ARRAY_SIZE(policy) - 1, policy)
339 
340 #define __NLA_ENSURE(condition) BUILD_BUG_ON_ZERO(!(condition))
341 #define NLA_ENSURE_INT_TYPE(tp)                         \
342         (__NLA_ENSURE(tp == NLA_S8 || tp == NLA_U8 ||   \
343                       tp == NLA_S16 || tp == NLA_U16 || \
344                       tp == NLA_S32 || tp == NLA_U32 || \
345                       tp == NLA_S64 || tp == NLA_U64) + tp)
346 #define NLA_ENSURE_NO_VALIDATION_PTR(tp)                \
347         (__NLA_ENSURE(tp != NLA_BITFIELD32 &&           \
348                       tp != NLA_REJECT &&               \
349                       tp != NLA_NESTED &&               \
350                       tp != NLA_NESTED_ARRAY) + tp)
351 
352 #define NLA_POLICY_RANGE(tp, _min, _max) {              \
353         .type = NLA_ENSURE_INT_TYPE(tp),                \
354         .validation_type = NLA_VALIDATE_RANGE,          \
355         .min = _min,                                    \
356         .max = _max                                     \
357 }
358 
359 #define NLA_POLICY_MIN(tp, _min) {                      \
360         .type = NLA_ENSURE_INT_TYPE(tp),                \
361         .validation_type = NLA_VALIDATE_MIN,            \
362         .min = _min,                                    \
363 }
364 
365 #define NLA_POLICY_MAX(tp, _max) {                      \
366         .type = NLA_ENSURE_INT_TYPE(tp),                \
367         .validation_type = NLA_VALIDATE_MAX,            \
368         .max = _max,                                    \
369 }
370 
371 #define NLA_POLICY_VALIDATE_FN(tp, fn, ...) {           \
372         .type = NLA_ENSURE_NO_VALIDATION_PTR(tp),       \
373         .validation_type = NLA_VALIDATE_FUNCTION,       \
374         .validate = fn,                                 \
375         .len = __VA_ARGS__ + 0,                         \
376 }
377 
378 /**
379  * struct nl_info - netlink source information
380  * @nlh: Netlink message header of original request
381  * @nl_net: Network namespace
382  * @portid: Netlink PORTID of requesting application
383  * @skip_notify: Skip netlink notifications to user space
384  * @skip_notify_kernel: Skip selected in-kernel notifications
385  */
386 struct nl_info {
387         struct nlmsghdr         *nlh;
388         struct net              *nl_net;
389         u32                     portid;
390         u8                      skip_notify:1,
391                                 skip_notify_kernel:1;
392 };
393 
394 /**
395  * enum netlink_validation - netlink message/attribute validation levels
396  * @NL_VALIDATE_LIBERAL: Old-style "be liberal" validation, not caring about
397  *      extra data at the end of the message, attributes being longer than
398  *      they should be, or unknown attributes being present.
399  * @NL_VALIDATE_TRAILING: Reject junk data encountered after attribute parsing.
400  * @NL_VALIDATE_MAXTYPE: Reject attributes > max type; Together with _TRAILING
401  *      this is equivalent to the old nla_parse_strict()/nlmsg_parse_strict().
402  * @NL_VALIDATE_UNSPEC: Reject attributes with NLA_UNSPEC in the policy.
403  *      This can safely be set by the kernel when the given policy has no
404  *      NLA_UNSPEC anymore, and can thus be used to ensure policy entries
405  *      are enforced going forward.
406  * @NL_VALIDATE_STRICT_ATTRS: strict attribute policy parsing (e.g.
407  *      U8, U16, U32 must have exact size, etc.)
408  * @NL_VALIDATE_NESTED: Check that NLA_F_NESTED is set for NLA_NESTED(_ARRAY)
409  *      and unset for other policies.
410  */
411 enum netlink_validation {
412         NL_VALIDATE_LIBERAL = 0,
413         NL_VALIDATE_TRAILING = BIT(0),
414         NL_VALIDATE_MAXTYPE = BIT(1),
415         NL_VALIDATE_UNSPEC = BIT(2),
416         NL_VALIDATE_STRICT_ATTRS = BIT(3),
417         NL_VALIDATE_NESTED = BIT(4),
418 };
419 
420 #define NL_VALIDATE_DEPRECATED_STRICT (NL_VALIDATE_TRAILING |\
421                                        NL_VALIDATE_MAXTYPE)
422 #define NL_VALIDATE_STRICT (NL_VALIDATE_TRAILING |\
423                             NL_VALIDATE_MAXTYPE |\
424                             NL_VALIDATE_UNSPEC |\
425                             NL_VALIDATE_STRICT_ATTRS |\
426                             NL_VALIDATE_NESTED)
427 
428 int netlink_rcv_skb(struct sk_buff *skb,
429                     int (*cb)(struct sk_buff *, struct nlmsghdr *,
430                               struct netlink_ext_ack *));
431 int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid,
432                  unsigned int group, int report, gfp_t flags);
433 
434 int __nla_validate(const struct nlattr *head, int len, int maxtype,
435                    const struct nla_policy *policy, unsigned int validate,
436                    struct netlink_ext_ack *extack);
437 int __nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head,
438                 int len, const struct nla_policy *policy, unsigned int validate,
439                 struct netlink_ext_ack *extack);
440 int nla_policy_len(const struct nla_policy *, int);
441 struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype);
442 size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize);
443 char *nla_strdup(const struct nlattr *nla, gfp_t flags);
444 int nla_memcpy(void *dest, const struct nlattr *src, int count);
445 int nla_memcmp(const struct nlattr *nla, const void *data, size_t size);
446 int nla_strcmp(const struct nlattr *nla, const char *str);
447 struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen);
448 struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype,
449                                    int attrlen, int padattr);
450 void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen);
451 struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen);
452 struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype,
453                                  int attrlen, int padattr);
454 void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen);
455 void __nla_put(struct sk_buff *skb, int attrtype, int attrlen,
456                const void *data);
457 void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen,
458                      const void *data, int padattr);
459 void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data);
460 int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data);
461 int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen,
462                   const void *data, int padattr);
463 int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data);
464 int nla_append(struct sk_buff *skb, int attrlen, const void *data);
465 
466 /**************************************************************************
467  * Netlink Messages
468  **************************************************************************/
469 
470 /**
471  * nlmsg_msg_size - length of netlink message not including padding
472  * @payload: length of message payload
473  */
474 static inline int nlmsg_msg_size(int payload)
475 {
476         return NLMSG_HDRLEN + payload;
477 }
478 
479 /**
480  * nlmsg_total_size - length of netlink message including padding
481  * @payload: length of message payload
482  */
483 static inline int nlmsg_total_size(int payload)
484 {
485         return NLMSG_ALIGN(nlmsg_msg_size(payload));
486 }
487 
488 /**
489  * nlmsg_padlen - length of padding at the message's tail
490  * @payload: length of message payload
491  */
492 static inline int nlmsg_padlen(int payload)
493 {
494         return nlmsg_total_size(payload) - nlmsg_msg_size(payload);
495 }
496 
497 /**
498  * nlmsg_data - head of message payload
499  * @nlh: netlink message header
500  */
501 static inline void *nlmsg_data(const struct nlmsghdr *nlh)
502 {
503         return (unsigned char *) nlh + NLMSG_HDRLEN;
504 }
505 
506 /**
507  * nlmsg_len - length of message payload
508  * @nlh: netlink message header
509  */
510 static inline int nlmsg_len(const struct nlmsghdr *nlh)
511 {
512         return nlh->nlmsg_len - NLMSG_HDRLEN;
513 }
514 
515 /**
516  * nlmsg_attrdata - head of attributes data
517  * @nlh: netlink message header
518  * @hdrlen: length of family specific header
519  */
520 static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh,
521                                             int hdrlen)
522 {
523         unsigned char *data = nlmsg_data(nlh);
524         return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen));
525 }
526 
527 /**
528  * nlmsg_attrlen - length of attributes data
529  * @nlh: netlink message header
530  * @hdrlen: length of family specific header
531  */
532 static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen)
533 {
534         return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen);
535 }
536 
537 /**
538  * nlmsg_ok - check if the netlink message fits into the remaining bytes
539  * @nlh: netlink message header
540  * @remaining: number of bytes remaining in message stream
541  */
542 static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining)
543 {
544         return (remaining >= (int) sizeof(struct nlmsghdr) &&
545                 nlh->nlmsg_len >= sizeof(struct nlmsghdr) &&
546                 nlh->nlmsg_len <= remaining);
547 }
548 
549 /**
550  * nlmsg_next - next netlink message in message stream
551  * @nlh: netlink message header
552  * @remaining: number of bytes remaining in message stream
553  *
554  * Returns the next netlink message in the message stream and
555  * decrements remaining by the size of the current message.
556  */
557 static inline struct nlmsghdr *
558 nlmsg_next(const struct nlmsghdr *nlh, int *remaining)
559 {
560         int totlen = NLMSG_ALIGN(nlh->nlmsg_len);
561 
562         *remaining -= totlen;
563 
564         return (struct nlmsghdr *) ((unsigned char *) nlh + totlen);
565 }
566 
567 /**
568  * nla_parse - Parse a stream of attributes into a tb buffer
569  * @tb: destination array with maxtype+1 elements
570  * @maxtype: maximum attribute type to be expected
571  * @head: head of attribute stream
572  * @len: length of attribute stream
573  * @policy: validation policy
574  * @extack: extended ACK pointer
575  *
576  * Parses a stream of attributes and stores a pointer to each attribute in
577  * the tb array accessible via the attribute type. Attributes with a type
578  * exceeding maxtype will be rejected, policy must be specified, attributes
579  * will be validated in the strictest way possible.
580  *
581  * Returns 0 on success or a negative error code.
582  */
583 static inline int nla_parse(struct nlattr **tb, int maxtype,
584                             const struct nlattr *head, int len,
585                             const struct nla_policy *policy,
586                             struct netlink_ext_ack *extack)
587 {
588         return __nla_parse(tb, maxtype, head, len, policy,
589                            NL_VALIDATE_STRICT, extack);
590 }
591 
592 /**
593  * nla_parse_deprecated - Parse a stream of attributes into a tb buffer
594  * @tb: destination array with maxtype+1 elements
595  * @maxtype: maximum attribute type to be expected
596  * @head: head of attribute stream
597  * @len: length of attribute stream
598  * @policy: validation policy
599  * @extack: extended ACK pointer
600  *
601  * Parses a stream of attributes and stores a pointer to each attribute in
602  * the tb array accessible via the attribute type. Attributes with a type
603  * exceeding maxtype will be ignored and attributes from the policy are not
604  * always strictly validated (only for new attributes).
605  *
606  * Returns 0 on success or a negative error code.
607  */
608 static inline int nla_parse_deprecated(struct nlattr **tb, int maxtype,
609                                        const struct nlattr *head, int len,
610                                        const struct nla_policy *policy,
611                                        struct netlink_ext_ack *extack)
612 {
613         return __nla_parse(tb, maxtype, head, len, policy,
614                            NL_VALIDATE_LIBERAL, extack);
615 }
616 
617 /**
618  * nla_parse_deprecated_strict - Parse a stream of attributes into a tb buffer
619  * @tb: destination array with maxtype+1 elements
620  * @maxtype: maximum attribute type to be expected
621  * @head: head of attribute stream
622  * @len: length of attribute stream
623  * @policy: validation policy
624  * @extack: extended ACK pointer
625  *
626  * Parses a stream of attributes and stores a pointer to each attribute in
627  * the tb array accessible via the attribute type. Attributes with a type
628  * exceeding maxtype will be rejected as well as trailing data, but the
629  * policy is not completely strictly validated (only for new attributes).
630  *
631  * Returns 0 on success or a negative error code.
632  */
633 static inline int nla_parse_deprecated_strict(struct nlattr **tb, int maxtype,
634                                               const struct nlattr *head,
635                                               int len,
636                                               const struct nla_policy *policy,
637                                               struct netlink_ext_ack *extack)
638 {
639         return __nla_parse(tb, maxtype, head, len, policy,
640                            NL_VALIDATE_DEPRECATED_STRICT, extack);
641 }
642 
643 /**
644  * __nlmsg_parse - parse attributes of a netlink message
645  * @nlh: netlink message header
646  * @hdrlen: length of family specific header
647  * @tb: destination array with maxtype+1 elements
648  * @maxtype: maximum attribute type to be expected
649  * @policy: validation policy
650  * @validate: validation strictness
651  * @extack: extended ACK report struct
652  *
653  * See nla_parse()
654  */
655 static inline int __nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen,
656                                 struct nlattr *tb[], int maxtype,
657                                 const struct nla_policy *policy,
658                                 unsigned int validate,
659                                 struct netlink_ext_ack *extack)
660 {
661         if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) {
662                 NL_SET_ERR_MSG(extack, "Invalid header length");
663                 return -EINVAL;
664         }
665 
666         return __nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen),
667                            nlmsg_attrlen(nlh, hdrlen), policy, validate,
668                            extack);
669 }
670 
671 /**
672  * nlmsg_parse - parse attributes of a netlink message
673  * @nlh: netlink message header
674  * @hdrlen: length of family specific header
675  * @tb: destination array with maxtype+1 elements
676  * @maxtype: maximum attribute type to be expected
677  * @validate: validation strictness
678  * @extack: extended ACK report struct
679  *
680  * See nla_parse()
681  */
682 static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen,
683                               struct nlattr *tb[], int maxtype,
684                               const struct nla_policy *policy,
685                               struct netlink_ext_ack *extack)
686 {
687         return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy,
688                              NL_VALIDATE_STRICT, extack);
689 }
690 
691 /**
692  * nlmsg_parse_deprecated - parse attributes of a netlink message
693  * @nlh: netlink message header
694  * @hdrlen: length of family specific header
695  * @tb: destination array with maxtype+1 elements
696  * @maxtype: maximum attribute type to be expected
697  * @extack: extended ACK report struct
698  *
699  * See nla_parse_deprecated()
700  */
701 static inline int nlmsg_parse_deprecated(const struct nlmsghdr *nlh, int hdrlen,
702                                          struct nlattr *tb[], int maxtype,
703                                          const struct nla_policy *policy,
704                                          struct netlink_ext_ack *extack)
705 {
706         return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy,
707                              NL_VALIDATE_LIBERAL, extack);
708 }
709 
710 /**
711  * nlmsg_parse_deprecated_strict - parse attributes of a netlink message
712  * @nlh: netlink message header
713  * @hdrlen: length of family specific header
714  * @tb: destination array with maxtype+1 elements
715  * @maxtype: maximum attribute type to be expected
716  * @extack: extended ACK report struct
717  *
718  * See nla_parse_deprecated_strict()
719  */
720 static inline int
721 nlmsg_parse_deprecated_strict(const struct nlmsghdr *nlh, int hdrlen,
722                               struct nlattr *tb[], int maxtype,
723                               const struct nla_policy *policy,
724                               struct netlink_ext_ack *extack)
725 {
726         return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy,
727                              NL_VALIDATE_DEPRECATED_STRICT, extack);
728 }
729 
730 /**
731  * nlmsg_find_attr - find a specific attribute in a netlink message
732  * @nlh: netlink message header
733  * @hdrlen: length of familiy specific header
734  * @attrtype: type of attribute to look for
735  *
736  * Returns the first attribute which matches the specified type.
737  */
738 static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh,
739                                              int hdrlen, int attrtype)
740 {
741         return nla_find(nlmsg_attrdata(nlh, hdrlen),
742                         nlmsg_attrlen(nlh, hdrlen), attrtype);
743 }
744 
745 /**
746  * nla_validate_deprecated - Validate a stream of attributes
747  * @head: head of attribute stream
748  * @len: length of attribute stream
749  * @maxtype: maximum attribute type to be expected
750  * @policy: validation policy
751  * @validate: validation strictness
752  * @extack: extended ACK report struct
753  *
754  * Validates all attributes in the specified attribute stream against the
755  * specified policy. Validation is done in liberal mode.
756  * See documenation of struct nla_policy for more details.
757  *
758  * Returns 0 on success or a negative error code.
759  */
760 static inline int nla_validate_deprecated(const struct nlattr *head, int len,
761                                           int maxtype,
762                                           const struct nla_policy *policy,
763                                           struct netlink_ext_ack *extack)
764 {
765         return __nla_validate(head, len, maxtype, policy, NL_VALIDATE_LIBERAL,
766                               extack);
767 }
768 
769 /**
770  * nla_validate - Validate a stream of attributes
771  * @head: head of attribute stream
772  * @len: length of attribute stream
773  * @maxtype: maximum attribute type to be expected
774  * @policy: validation policy
775  * @validate: validation strictness
776  * @extack: extended ACK report struct
777  *
778  * Validates all attributes in the specified attribute stream against the
779  * specified policy. Validation is done in strict mode.
780  * See documenation of struct nla_policy for more details.
781  *
782  * Returns 0 on success or a negative error code.
783  */
784 static inline int nla_validate(const struct nlattr *head, int len, int maxtype,
785                                const struct nla_policy *policy,
786                                struct netlink_ext_ack *extack)
787 {
788         return __nla_validate(head, len, maxtype, policy, NL_VALIDATE_STRICT,
789                               extack);
790 }
791 
792 /**
793  * nlmsg_validate_deprecated - validate a netlink message including attributes
794  * @nlh: netlinket message header
795  * @hdrlen: length of familiy specific header
796  * @maxtype: maximum attribute type to be expected
797  * @policy: validation policy
798  * @extack: extended ACK report struct
799  */
800 static inline int nlmsg_validate_deprecated(const struct nlmsghdr *nlh,
801                                             int hdrlen, int maxtype,
802                                             const struct nla_policy *policy,
803                                             struct netlink_ext_ack *extack)
804 {
805         if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
806                 return -EINVAL;
807 
808         return __nla_validate(nlmsg_attrdata(nlh, hdrlen),
809                               nlmsg_attrlen(nlh, hdrlen), maxtype,
810                               policy, NL_VALIDATE_LIBERAL, extack);
811 }
812 
813 
814 
815 /**
816  * nlmsg_report - need to report back to application?
817  * @nlh: netlink message header
818  *
819  * Returns 1 if a report back to the application is requested.
820  */
821 static inline int nlmsg_report(const struct nlmsghdr *nlh)
822 {
823         return !!(nlh->nlmsg_flags & NLM_F_ECHO);
824 }
825 
826 /**
827  * nlmsg_for_each_attr - iterate over a stream of attributes
828  * @pos: loop counter, set to current attribute
829  * @nlh: netlink message header
830  * @hdrlen: length of familiy specific header
831  * @rem: initialized to len, holds bytes currently remaining in stream
832  */
833 #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \
834         nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \
835                           nlmsg_attrlen(nlh, hdrlen), rem)
836 
837 /**
838  * nlmsg_put - Add a new netlink message to an skb
839  * @skb: socket buffer to store message in
840  * @portid: netlink PORTID of requesting application
841  * @seq: sequence number of message
842  * @type: message type
843  * @payload: length of message payload
844  * @flags: message flags
845  *
846  * Returns NULL if the tailroom of the skb is insufficient to store
847  * the message header and payload.
848  */
849 static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
850                                          int type, int payload, int flags)
851 {
852         if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload)))
853                 return NULL;
854 
855         return __nlmsg_put(skb, portid, seq, type, payload, flags);
856 }
857 
858 /**
859  * nlmsg_put_answer - Add a new callback based netlink message to an skb
860  * @skb: socket buffer to store message in
861  * @cb: netlink callback
862  * @type: message type
863  * @payload: length of message payload
864  * @flags: message flags
865  *
866  * Returns NULL if the tailroom of the skb is insufficient to store
867  * the message header and payload.
868  */
869 static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb,
870                                                 struct netlink_callback *cb,
871                                                 int type, int payload,
872                                                 int flags)
873 {
874         return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
875                          type, payload, flags);
876 }
877 
878 /**
879  * nlmsg_new - Allocate a new netlink message
880  * @payload: size of the message payload
881  * @flags: the type of memory to allocate.
882  *
883  * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known
884  * and a good default is needed.
885  */
886 static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags)
887 {
888         return alloc_skb(nlmsg_total_size(payload), flags);
889 }
890 
891 /**
892  * nlmsg_end - Finalize a netlink message
893  * @skb: socket buffer the message is stored in
894  * @nlh: netlink message header
895  *
896  * Corrects the netlink message header to include the appeneded
897  * attributes. Only necessary if attributes have been added to
898  * the message.
899  */
900 static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh)
901 {
902         nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
903 }
904 
905 /**
906  * nlmsg_get_pos - return current position in netlink message
907  * @skb: socket buffer the message is stored in
908  *
909  * Returns a pointer to the current tail of the message.
910  */
911 static inline void *nlmsg_get_pos(struct sk_buff *skb)
912 {
913         return skb_tail_pointer(skb);
914 }
915 
916 /**
917  * nlmsg_trim - Trim message to a mark
918  * @skb: socket buffer the message is stored in
919  * @mark: mark to trim to
920  *
921  * Trims the message to the provided mark.
922  */
923 static inline void nlmsg_trim(struct sk_buff *skb, const void *mark)
924 {
925         if (mark) {
926                 WARN_ON((unsigned char *) mark < skb->data);
927                 skb_trim(skb, (unsigned char *) mark - skb->data);
928         }
929 }
930 
931 /**
932  * nlmsg_cancel - Cancel construction of a netlink message
933  * @skb: socket buffer the message is stored in
934  * @nlh: netlink message header
935  *
936  * Removes the complete netlink message including all
937  * attributes from the socket buffer again.
938  */
939 static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh)
940 {
941         nlmsg_trim(skb, nlh);
942 }
943 
944 /**
945  * nlmsg_free - free a netlink message
946  * @skb: socket buffer of netlink message
947  */
948 static inline void nlmsg_free(struct sk_buff *skb)
949 {
950         kfree_skb(skb);
951 }
952 
953 /**
954  * nlmsg_multicast - multicast a netlink message
955  * @sk: netlink socket to spread messages to
956  * @skb: netlink message as socket buffer
957  * @portid: own netlink portid to avoid sending to yourself
958  * @group: multicast group id
959  * @flags: allocation flags
960  */
961 static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb,
962                                   u32 portid, unsigned int group, gfp_t flags)
963 {
964         int err;
965 
966         NETLINK_CB(skb).dst_group = group;
967 
968         err = netlink_broadcast(sk, skb, portid, group, flags);
969         if (err > 0)
970                 err = 0;
971 
972         return err;
973 }
974 
975 /**
976  * nlmsg_unicast - unicast a netlink message
977  * @sk: netlink socket to spread message to
978  * @skb: netlink message as socket buffer
979  * @portid: netlink portid of the destination socket
980  */
981 static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid)
982 {
983         int err;
984 
985         err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT);
986         if (err > 0)
987                 err = 0;
988 
989         return err;
990 }
991 
992 /**
993  * nlmsg_for_each_msg - iterate over a stream of messages
994  * @pos: loop counter, set to current message
995  * @head: head of message stream
996  * @len: length of message stream
997  * @rem: initialized to len, holds bytes currently remaining in stream
998  */
999 #define nlmsg_for_each_msg(pos, head, len, rem) \
1000         for (pos = head, rem = len; \
1001              nlmsg_ok(pos, rem); \
1002              pos = nlmsg_next(pos, &(rem)))
1003 
1004 /**
1005  * nl_dump_check_consistent - check if sequence is consistent and advertise if not
1006  * @cb: netlink callback structure that stores the sequence number
1007  * @nlh: netlink message header to write the flag to
1008  *
1009  * This function checks if the sequence (generation) number changed during dump
1010  * and if it did, advertises it in the netlink message header.
1011  *
1012  * The correct way to use it is to set cb->seq to the generation counter when
1013  * all locks for dumping have been acquired, and then call this function for
1014  * each message that is generated.
1015  *
1016  * Note that due to initialisation concerns, 0 is an invalid sequence number
1017  * and must not be used by code that uses this functionality.
1018  */
1019 static inline void
1020 nl_dump_check_consistent(struct netlink_callback *cb,
1021                          struct nlmsghdr *nlh)
1022 {
1023         if (cb->prev_seq && cb->seq != cb->prev_seq)
1024                 nlh->nlmsg_flags |= NLM_F_DUMP_INTR;
1025         cb->prev_seq = cb->seq;
1026 }
1027 
1028 /**************************************************************************
1029  * Netlink Attributes
1030  **************************************************************************/
1031 
1032 /**
1033  * nla_attr_size - length of attribute not including padding
1034  * @payload: length of payload
1035  */
1036 static inline int nla_attr_size(int payload)
1037 {
1038         return NLA_HDRLEN + payload;
1039 }
1040 
1041 /**
1042  * nla_total_size - total length of attribute including padding
1043  * @payload: length of payload
1044  */
1045 static inline int nla_total_size(int payload)
1046 {
1047         return NLA_ALIGN(nla_attr_size(payload));
1048 }
1049 
1050 /**
1051  * nla_padlen - length of padding at the tail of attribute
1052  * @payload: length of payload
1053  */
1054 static inline int nla_padlen(int payload)
1055 {
1056         return nla_total_size(payload) - nla_attr_size(payload);
1057 }
1058 
1059 /**
1060  * nla_type - attribute type
1061  * @nla: netlink attribute
1062  */
1063 static inline int nla_type(const struct nlattr *nla)
1064 {
1065         return nla->nla_type & NLA_TYPE_MASK;
1066 }
1067 
1068 /**
1069  * nla_data - head of payload
1070  * @nla: netlink attribute
1071  */
1072 static inline void *nla_data(const struct nlattr *nla)
1073 {
1074         return (char *) nla + NLA_HDRLEN;
1075 }
1076 
1077 /**
1078  * nla_len - length of payload
1079  * @nla: netlink attribute
1080  */
1081 static inline int nla_len(const struct nlattr *nla)
1082 {
1083         return nla->nla_len - NLA_HDRLEN;
1084 }
1085 
1086 /**
1087  * nla_ok - check if the netlink attribute fits into the remaining bytes
1088  * @nla: netlink attribute
1089  * @remaining: number of bytes remaining in attribute stream
1090  */
1091 static inline int nla_ok(const struct nlattr *nla, int remaining)
1092 {
1093         return remaining >= (int) sizeof(*nla) &&
1094                nla->nla_len >= sizeof(*nla) &&
1095                nla->nla_len <= remaining;
1096 }
1097 
1098 /**
1099  * nla_next - next netlink attribute in attribute stream
1100  * @nla: netlink attribute
1101  * @remaining: number of bytes remaining in attribute stream
1102  *
1103  * Returns the next netlink attribute in the attribute stream and
1104  * decrements remaining by the size of the current attribute.
1105  */
1106 static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining)
1107 {
1108         unsigned int totlen = NLA_ALIGN(nla->nla_len);
1109 
1110         *remaining -= totlen;
1111         return (struct nlattr *) ((char *) nla + totlen);
1112 }
1113 
1114 /**
1115  * nla_find_nested - find attribute in a set of nested attributes
1116  * @nla: attribute containing the nested attributes
1117  * @attrtype: type of attribute to look for
1118  *
1119  * Returns the first attribute which matches the specified type.
1120  */
1121 static inline struct nlattr *
1122 nla_find_nested(const struct nlattr *nla, int attrtype)
1123 {
1124         return nla_find(nla_data(nla), nla_len(nla), attrtype);
1125 }
1126 
1127 /**
1128  * nla_parse_nested - parse nested attributes
1129  * @tb: destination array with maxtype+1 elements
1130  * @maxtype: maximum attribute type to be expected
1131  * @nla: attribute containing the nested attributes
1132  * @policy: validation policy
1133  * @extack: extended ACK report struct
1134  *
1135  * See nla_parse()
1136  */
1137 static inline int nla_parse_nested(struct nlattr *tb[], int maxtype,
1138                                    const struct nlattr *nla,
1139                                    const struct nla_policy *policy,
1140                                    struct netlink_ext_ack *extack)
1141 {
1142         if (!(nla->nla_type & NLA_F_NESTED)) {
1143                 NL_SET_ERR_MSG_ATTR(extack, nla, "NLA_F_NESTED is missing");
1144                 return -EINVAL;
1145         }
1146 
1147         return __nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy,
1148                            NL_VALIDATE_STRICT, extack);
1149 }
1150 
1151 /**
1152  * nla_parse_nested_deprecated - parse nested attributes
1153  * @tb: destination array with maxtype+1 elements
1154  * @maxtype: maximum attribute type to be expected
1155  * @nla: attribute containing the nested attributes
1156  * @policy: validation policy
1157  * @extack: extended ACK report struct
1158  *
1159  * See nla_parse_deprecated()
1160  */
1161 static inline int nla_parse_nested_deprecated(struct nlattr *tb[], int maxtype,
1162                                               const struct nlattr *nla,
1163                                               const struct nla_policy *policy,
1164                                               struct netlink_ext_ack *extack)
1165 {
1166         return __nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy,
1167                            NL_VALIDATE_LIBERAL, extack);
1168 }
1169 
1170 /**
1171  * nla_put_u8 - Add a u8 netlink attribute to a socket buffer
1172  * @skb: socket buffer to add attribute to
1173  * @attrtype: attribute type
1174  * @value: numeric value
1175  */
1176 static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value)
1177 {
1178         /* temporary variables to work around GCC PR81715 with asan-stack=1 */
1179         u8 tmp = value;
1180 
1181         return nla_put(skb, attrtype, sizeof(u8), &tmp);
1182 }
1183 
1184 /**
1185  * nla_put_u16 - Add a u16 netlink attribute to a socket buffer
1186  * @skb: socket buffer to add attribute to
1187  * @attrtype: attribute type
1188  * @value: numeric value
1189  */
1190 static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value)
1191 {
1192         u16 tmp = value;
1193 
1194         return nla_put(skb, attrtype, sizeof(u16), &tmp);
1195 }
1196 
1197 /**
1198  * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer
1199  * @skb: socket buffer to add attribute to
1200  * @attrtype: attribute type
1201  * @value: numeric value
1202  */
1203 static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value)
1204 {
1205         __be16 tmp = value;
1206 
1207         return nla_put(skb, attrtype, sizeof(__be16), &tmp);
1208 }
1209 
1210 /**
1211  * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer
1212  * @skb: socket buffer to add attribute to
1213  * @attrtype: attribute type
1214  * @value: numeric value
1215  */
1216 static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value)
1217 {
1218         __be16 tmp = value;
1219 
1220         return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, tmp);
1221 }
1222 
1223 /**
1224  * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer
1225  * @skb: socket buffer to add attribute to
1226  * @attrtype: attribute type
1227  * @value: numeric value
1228  */
1229 static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value)
1230 {
1231         __le16 tmp = value;
1232 
1233         return nla_put(skb, attrtype, sizeof(__le16), &tmp);
1234 }
1235 
1236 /**
1237  * nla_put_u32 - Add a u32 netlink attribute to a socket buffer
1238  * @skb: socket buffer to add attribute to
1239  * @attrtype: attribute type
1240  * @value: numeric value
1241  */
1242 static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value)
1243 {
1244         u32 tmp = value;
1245 
1246         return nla_put(skb, attrtype, sizeof(u32), &tmp);
1247 }
1248 
1249 /**
1250  * nla_put_be32 - Add a __be32 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_be32(struct sk_buff *skb, int attrtype, __be32 value)
1256 {
1257         __be32 tmp = value;
1258 
1259         return nla_put(skb, attrtype, sizeof(__be32), &tmp);
1260 }
1261 
1262 /**
1263  * nla_put_net32 - Add 32-bit network byte order 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_net32(struct sk_buff *skb, int attrtype, __be32 value)
1269 {
1270         __be32 tmp = value;
1271 
1272         return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, tmp);
1273 }
1274 
1275 /**
1276  * nla_put_le32 - Add a __le32 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_le32(struct sk_buff *skb, int attrtype, __le32 value)
1282 {
1283         __le32 tmp = value;
1284 
1285         return nla_put(skb, attrtype, sizeof(__le32), &tmp);
1286 }
1287 
1288 /**
1289  * nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it
1290  * @skb: socket buffer to add attribute to
1291  * @attrtype: attribute type
1292  * @value: numeric value
1293  * @padattr: attribute type for the padding
1294  */
1295 static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype,
1296                                     u64 value, int padattr)
1297 {
1298         u64 tmp = value;
1299 
1300         return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr);
1301 }
1302 
1303 /**
1304  * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it
1305  * @skb: socket buffer to add attribute to
1306  * @attrtype: attribute type
1307  * @value: numeric value
1308  * @padattr: attribute type for the padding
1309  */
1310 static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value,
1311                                int padattr)
1312 {
1313         __be64 tmp = value;
1314 
1315         return nla_put_64bit(skb, attrtype, sizeof(__be64), &tmp, padattr);
1316 }
1317 
1318 /**
1319  * nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it
1320  * @skb: socket buffer to add attribute to
1321  * @attrtype: attribute type
1322  * @value: numeric value
1323  * @padattr: attribute type for the padding
1324  */
1325 static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value,
1326                                 int padattr)
1327 {
1328         __be64 tmp = value;
1329 
1330         return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, tmp,
1331                             padattr);
1332 }
1333 
1334 /**
1335  * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer and align it
1336  * @skb: socket buffer to add attribute to
1337  * @attrtype: attribute type
1338  * @value: numeric value
1339  * @padattr: attribute type for the padding
1340  */
1341 static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value,
1342                                int padattr)
1343 {
1344         __le64 tmp = value;
1345 
1346         return nla_put_64bit(skb, attrtype, sizeof(__le64), &tmp, padattr);
1347 }
1348 
1349 /**
1350  * nla_put_s8 - Add a s8 netlink attribute to a socket buffer
1351  * @skb: socket buffer to add attribute to
1352  * @attrtype: attribute type
1353  * @value: numeric value
1354  */
1355 static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value)
1356 {
1357         s8 tmp = value;
1358 
1359         return nla_put(skb, attrtype, sizeof(s8), &tmp);
1360 }
1361 
1362 /**
1363  * nla_put_s16 - Add a s16 netlink attribute to a socket buffer
1364  * @skb: socket buffer to add attribute to
1365  * @attrtype: attribute type
1366  * @value: numeric value
1367  */
1368 static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value)
1369 {
1370         s16 tmp = value;
1371 
1372         return nla_put(skb, attrtype, sizeof(s16), &tmp);
1373 }
1374 
1375 /**
1376  * nla_put_s32 - Add a s32 netlink attribute to a socket buffer
1377  * @skb: socket buffer to add attribute to
1378  * @attrtype: attribute type
1379  * @value: numeric value
1380  */
1381 static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value)
1382 {
1383         s32 tmp = value;
1384 
1385         return nla_put(skb, attrtype, sizeof(s32), &tmp);
1386 }
1387 
1388 /**
1389  * nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it
1390  * @skb: socket buffer to add attribute to
1391  * @attrtype: attribute type
1392  * @value: numeric value
1393  * @padattr: attribute type for the padding
1394  */
1395 static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value,
1396                               int padattr)
1397 {
1398         s64 tmp = value;
1399 
1400         return nla_put_64bit(skb, attrtype, sizeof(s64), &tmp, padattr);
1401 }
1402 
1403 /**
1404  * nla_put_string - Add a string netlink attribute to a socket buffer
1405  * @skb: socket buffer to add attribute to
1406  * @attrtype: attribute type
1407  * @str: NUL terminated string
1408  */
1409 static inline int nla_put_string(struct sk_buff *skb, int attrtype,
1410                                  const char *str)
1411 {
1412         return nla_put(skb, attrtype, strlen(str) + 1, str);
1413 }
1414 
1415 /**
1416  * nla_put_flag - Add a flag netlink attribute to a socket buffer
1417  * @skb: socket buffer to add attribute to
1418  * @attrtype: attribute type
1419  */
1420 static inline int nla_put_flag(struct sk_buff *skb, int attrtype)
1421 {
1422         return nla_put(skb, attrtype, 0, NULL);
1423 }
1424 
1425 /**
1426  * nla_put_msecs - Add a msecs netlink attribute to a skb and align it
1427  * @skb: socket buffer to add attribute to
1428  * @attrtype: attribute type
1429  * @njiffies: number of jiffies to convert to msecs
1430  * @padattr: attribute type for the padding
1431  */
1432 static inline int nla_put_msecs(struct sk_buff *skb, int attrtype,
1433                                 unsigned long njiffies, int padattr)
1434 {
1435         u64 tmp = jiffies_to_msecs(njiffies);
1436 
1437         return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr);
1438 }
1439 
1440 /**
1441  * nla_put_in_addr - Add an IPv4 address netlink attribute to a socket
1442  * buffer
1443  * @skb: socket buffer to add attribute to
1444  * @attrtype: attribute type
1445  * @addr: IPv4 address
1446  */
1447 static inline int nla_put_in_addr(struct sk_buff *skb, int attrtype,
1448                                   __be32 addr)
1449 {
1450         __be32 tmp = addr;
1451 
1452         return nla_put_be32(skb, attrtype, tmp);
1453 }
1454 
1455 /**
1456  * nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket
1457  * buffer
1458  * @skb: socket buffer to add attribute to
1459  * @attrtype: attribute type
1460  * @addr: IPv6 address
1461  */
1462 static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype,
1463                                    const struct in6_addr *addr)
1464 {
1465         return nla_put(skb, attrtype, sizeof(*addr), addr);
1466 }
1467 
1468 /**
1469  * nla_put_bitfield32 - Add a bitfield32 netlink attribute to a socket buffer
1470  * @skb: socket buffer to add attribute to
1471  * @attrtype: attribute type
1472  * @value: value carrying bits
1473  * @selector: selector of valid bits
1474  */
1475 static inline int nla_put_bitfield32(struct sk_buff *skb, int attrtype,
1476                                      __u32 value, __u32 selector)
1477 {
1478         struct nla_bitfield32 tmp = { value, selector, };
1479 
1480         return nla_put(skb, attrtype, sizeof(tmp), &tmp);
1481 }
1482 
1483 /**
1484  * nla_get_u32 - return payload of u32 attribute
1485  * @nla: u32 netlink attribute
1486  */
1487 static inline u32 nla_get_u32(const struct nlattr *nla)
1488 {
1489         return *(u32 *) nla_data(nla);
1490 }
1491 
1492 /**
1493  * nla_get_be32 - return payload of __be32 attribute
1494  * @nla: __be32 netlink attribute
1495  */
1496 static inline __be32 nla_get_be32(const struct nlattr *nla)
1497 {
1498         return *(__be32 *) nla_data(nla);
1499 }
1500 
1501 /**
1502  * nla_get_le32 - return payload of __le32 attribute
1503  * @nla: __le32 netlink attribute
1504  */
1505 static inline __le32 nla_get_le32(const struct nlattr *nla)
1506 {
1507         return *(__le32 *) nla_data(nla);
1508 }
1509 
1510 /**
1511  * nla_get_u16 - return payload of u16 attribute
1512  * @nla: u16 netlink attribute
1513  */
1514 static inline u16 nla_get_u16(const struct nlattr *nla)
1515 {
1516         return *(u16 *) nla_data(nla);
1517 }
1518 
1519 /**
1520  * nla_get_be16 - return payload of __be16 attribute
1521  * @nla: __be16 netlink attribute
1522  */
1523 static inline __be16 nla_get_be16(const struct nlattr *nla)
1524 {
1525         return *(__be16 *) nla_data(nla);
1526 }
1527 
1528 /**
1529  * nla_get_le16 - return payload of __le16 attribute
1530  * @nla: __le16 netlink attribute
1531  */
1532 static inline __le16 nla_get_le16(const struct nlattr *nla)
1533 {
1534         return *(__le16 *) nla_data(nla);
1535 }
1536 
1537 /**
1538  * nla_get_u8 - return payload of u8 attribute
1539  * @nla: u8 netlink attribute
1540  */
1541 static inline u8 nla_get_u8(const struct nlattr *nla)
1542 {
1543         return *(u8 *) nla_data(nla);
1544 }
1545 
1546 /**
1547  * nla_get_u64 - return payload of u64 attribute
1548  * @nla: u64 netlink attribute
1549  */
1550 static inline u64 nla_get_u64(const struct nlattr *nla)
1551 {
1552         u64 tmp;
1553 
1554         nla_memcpy(&tmp, nla, sizeof(tmp));
1555 
1556         return tmp;
1557 }
1558 
1559 /**
1560  * nla_get_be64 - return payload of __be64 attribute
1561  * @nla: __be64 netlink attribute
1562  */
1563 static inline __be64 nla_get_be64(const struct nlattr *nla)
1564 {
1565         __be64 tmp;
1566 
1567         nla_memcpy(&tmp, nla, sizeof(tmp));
1568 
1569         return tmp;
1570 }
1571 
1572 /**
1573  * nla_get_le64 - return payload of __le64 attribute
1574  * @nla: __le64 netlink attribute
1575  */
1576 static inline __le64 nla_get_le64(const struct nlattr *nla)
1577 {
1578         return *(__le64 *) nla_data(nla);
1579 }
1580 
1581 /**
1582  * nla_get_s32 - return payload of s32 attribute
1583  * @nla: s32 netlink attribute
1584  */
1585 static inline s32 nla_get_s32(const struct nlattr *nla)
1586 {
1587         return *(s32 *) nla_data(nla);
1588 }
1589 
1590 /**
1591  * nla_get_s16 - return payload of s16 attribute
1592  * @nla: s16 netlink attribute
1593  */
1594 static inline s16 nla_get_s16(const struct nlattr *nla)
1595 {
1596         return *(s16 *) nla_data(nla);
1597 }
1598 
1599 /**
1600  * nla_get_s8 - return payload of s8 attribute
1601  * @nla: s8 netlink attribute
1602  */
1603 static inline s8 nla_get_s8(const struct nlattr *nla)
1604 {
1605         return *(s8 *) nla_data(nla);
1606 }
1607 
1608 /**
1609  * nla_get_s64 - return payload of s64 attribute
1610  * @nla: s64 netlink attribute
1611  */
1612 static inline s64 nla_get_s64(const struct nlattr *nla)
1613 {
1614         s64 tmp;
1615 
1616         nla_memcpy(&tmp, nla, sizeof(tmp));
1617 
1618         return tmp;
1619 }
1620 
1621 /**
1622  * nla_get_flag - return payload of flag attribute
1623  * @nla: flag netlink attribute
1624  */
1625 static inline int nla_get_flag(const struct nlattr *nla)
1626 {
1627         return !!nla;
1628 }
1629 
1630 /**
1631  * nla_get_msecs - return payload of msecs attribute
1632  * @nla: msecs netlink attribute
1633  *
1634  * Returns the number of milliseconds in jiffies.
1635  */
1636 static inline unsigned long nla_get_msecs(const struct nlattr *nla)
1637 {
1638         u64 msecs = nla_get_u64(nla);
1639 
1640         return msecs_to_jiffies((unsigned long) msecs);
1641 }
1642 
1643 /**
1644  * nla_get_in_addr - return payload of IPv4 address attribute
1645  * @nla: IPv4 address netlink attribute
1646  */
1647 static inline __be32 nla_get_in_addr(const struct nlattr *nla)
1648 {
1649         return *(__be32 *) nla_data(nla);
1650 }
1651 
1652 /**
1653  * nla_get_in6_addr - return payload of IPv6 address attribute
1654  * @nla: IPv6 address netlink attribute
1655  */
1656 static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla)
1657 {
1658         struct in6_addr tmp;
1659 
1660         nla_memcpy(&tmp, nla, sizeof(tmp));
1661         return tmp;
1662 }
1663 
1664 /**
1665  * nla_get_bitfield32 - return payload of 32 bitfield attribute
1666  * @nla: nla_bitfield32 attribute
1667  */
1668 static inline struct nla_bitfield32 nla_get_bitfield32(const struct nlattr *nla)
1669 {
1670         struct nla_bitfield32 tmp;
1671 
1672         nla_memcpy(&tmp, nla, sizeof(tmp));
1673         return tmp;
1674 }
1675 
1676 /**
1677  * nla_memdup - duplicate attribute memory (kmemdup)
1678  * @src: netlink attribute to duplicate from
1679  * @gfp: GFP mask
1680  */
1681 static inline void *nla_memdup(const struct nlattr *src, gfp_t gfp)
1682 {
1683         return kmemdup(nla_data(src), nla_len(src), gfp);
1684 }
1685 
1686 /**
1687  * nla_nest_start_noflag - Start a new level of nested attributes
1688  * @skb: socket buffer to add attributes to
1689  * @attrtype: attribute type of container
1690  *
1691  * This function exists for backward compatibility to use in APIs which never
1692  * marked their nest attributes with NLA_F_NESTED flag. New APIs should use
1693  * nla_nest_start() which sets the flag.
1694  *
1695  * Returns the container attribute or NULL on error
1696  */
1697 static inline struct nlattr *nla_nest_start_noflag(struct sk_buff *skb,
1698                                                    int attrtype)
1699 {
1700         struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb);
1701 
1702         if (nla_put(skb, attrtype, 0, NULL) < 0)
1703                 return NULL;
1704 
1705         return start;
1706 }
1707 
1708 /**
1709  * nla_nest_start - Start a new level of nested attributes, with NLA_F_NESTED
1710  * @skb: socket buffer to add attributes to
1711  * @attrtype: attribute type of container
1712  *
1713  * Unlike nla_nest_start_noflag(), mark the nest attribute with NLA_F_NESTED
1714  * flag. This is the preferred function to use in new code.
1715  *
1716  * Returns the container attribute or NULL on error
1717  */
1718 static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype)
1719 {
1720         return nla_nest_start_noflag(skb, attrtype | NLA_F_NESTED);
1721 }
1722 
1723 /**
1724  * nla_nest_end - Finalize nesting of attributes
1725  * @skb: socket buffer the attributes are stored in
1726  * @start: container attribute
1727  *
1728  * Corrects the container attribute header to include the all
1729  * appeneded attributes.
1730  *
1731  * Returns the total data length of the skb.
1732  */
1733 static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start)
1734 {
1735         start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start;
1736         return skb->len;
1737 }
1738 
1739 /**
1740  * nla_nest_cancel - Cancel nesting of attributes
1741  * @skb: socket buffer the message is stored in
1742  * @start: container attribute
1743  *
1744  * Removes the container attribute and including all nested
1745  * attributes. Returns -EMSGSIZE
1746  */
1747 static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start)
1748 {
1749         nlmsg_trim(skb, start);
1750 }
1751 
1752 /**
1753  * __nla_validate_nested - Validate a stream of nested attributes
1754  * @start: container attribute
1755  * @maxtype: maximum attribute type to be expected
1756  * @policy: validation policy
1757  * @validate: validation strictness
1758  * @extack: extended ACK report struct
1759  *
1760  * Validates all attributes in the nested attribute stream against the
1761  * specified policy. Attributes with a type exceeding maxtype will be
1762  * ignored. See documenation of struct nla_policy for more details.
1763  *
1764  * Returns 0 on success or a negative error code.
1765  */
1766 static inline int __nla_validate_nested(const struct nlattr *start, int maxtype,
1767                                         const struct nla_policy *policy,
1768                                         unsigned int validate,
1769                                         struct netlink_ext_ack *extack)
1770 {
1771         return __nla_validate(nla_data(start), nla_len(start), maxtype, policy,
1772                               validate, extack);
1773 }
1774 
1775 static inline int
1776 nla_validate_nested(const struct nlattr *start, int maxtype,
1777                     const struct nla_policy *policy,
1778                     struct netlink_ext_ack *extack)
1779 {
1780         return __nla_validate_nested(start, maxtype, policy,
1781                                      NL_VALIDATE_STRICT, extack);
1782 }
1783 
1784 static inline int
1785 nla_validate_nested_deprecated(const struct nlattr *start, int maxtype,
1786                                const struct nla_policy *policy,
1787                                struct netlink_ext_ack *extack)
1788 {
1789         return __nla_validate_nested(start, maxtype, policy,
1790                                      NL_VALIDATE_LIBERAL, extack);
1791 }
1792 
1793 /**
1794  * nla_need_padding_for_64bit - test 64-bit alignment of the next attribute
1795  * @skb: socket buffer the message is stored in
1796  *
1797  * Return true if padding is needed to align the next attribute (nla_data()) to
1798  * a 64-bit aligned area.
1799  */
1800 static inline bool nla_need_padding_for_64bit(struct sk_buff *skb)
1801 {
1802 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1803         /* The nlattr header is 4 bytes in size, that's why we test
1804          * if the skb->data _is_ aligned.  A NOP attribute, plus
1805          * nlattr header for next attribute, will make nla_data()
1806          * 8-byte aligned.
1807          */
1808         if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb), 8))
1809                 return true;
1810 #endif
1811         return false;
1812 }
1813 
1814 /**
1815  * nla_align_64bit - 64-bit align the nla_data() of next attribute
1816  * @skb: socket buffer the message is stored in
1817  * @padattr: attribute type for the padding
1818  *
1819  * Conditionally emit a padding netlink attribute in order to make
1820  * the next attribute we emit have a 64-bit aligned nla_data() area.
1821  * This will only be done in architectures which do not have
1822  * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined.
1823  *
1824  * Returns zero on success or a negative error code.
1825  */
1826 static inline int nla_align_64bit(struct sk_buff *skb, int padattr)
1827 {
1828         if (nla_need_padding_for_64bit(skb) &&
1829             !nla_reserve(skb, padattr, 0))
1830                 return -EMSGSIZE;
1831 
1832         return 0;
1833 }
1834 
1835 /**
1836  * nla_total_size_64bit - total length of attribute including padding
1837  * @payload: length of payload
1838  */
1839 static inline int nla_total_size_64bit(int payload)
1840 {
1841         return NLA_ALIGN(nla_attr_size(payload))
1842 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1843                 + NLA_ALIGN(nla_attr_size(0))
1844 #endif
1845                 ;
1846 }
1847 
1848 /**
1849  * nla_for_each_attr - iterate over a stream of attributes
1850  * @pos: loop counter, set to current attribute
1851  * @head: head of attribute stream
1852  * @len: length of attribute stream
1853  * @rem: initialized to len, holds bytes currently remaining in stream
1854  */
1855 #define nla_for_each_attr(pos, head, len, rem) \
1856         for (pos = head, rem = len; \
1857              nla_ok(pos, rem); \
1858              pos = nla_next(pos, &(rem)))
1859 
1860 /**
1861  * nla_for_each_nested - iterate over nested attributes
1862  * @pos: loop counter, set to current attribute
1863  * @nla: attribute containing the nested attributes
1864  * @rem: initialized to len, holds bytes currently remaining in stream
1865  */
1866 #define nla_for_each_nested(pos, nla, rem) \
1867         nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem)
1868 
1869 /**
1870  * nla_is_last - Test if attribute is last in stream
1871  * @nla: attribute to test
1872  * @rem: bytes remaining in stream
1873  */
1874 static inline bool nla_is_last(const struct nlattr *nla, int rem)
1875 {
1876         return nla->nla_len == rem;
1877 }
1878 
1879 #endif
1880 

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