tcp: do not release socket ownership in tcp_close()

[mirror_ubuntu-jammy-kernel.git] / include / net / netlink.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NET_NETLINK_H
#define __NET_NETLINK_H

#include <linux/types.h>
#include <linux/netlink.h>
#include <linux/jiffies.h>
#include <linux/in6.h>

/* ========================================================================
 *         Netlink Messages and Attributes Interface (As Seen On TV)
 * ------------------------------------------------------------------------
 *                          Messages Interface
 * ------------------------------------------------------------------------
 *
 * Message Format:
 *    <--- nlmsg_total_size(payload)  --->
 *    <-- nlmsg_msg_size(payload) ->
 *   +----------+- - -+-------------+- - -+-------- - -
 *   | nlmsghdr | Pad |   Payload   | Pad | nlmsghdr
 *   +----------+- - -+-------------+- - -+-------- - -
 *   nlmsg_data(nlh)---^                   ^
 *   nlmsg_next(nlh)-----------------------+
 *
 * Payload Format:
 *    <---------------------- nlmsg_len(nlh) --------------------->
 *    <------ hdrlen ------>       <- nlmsg_attrlen(nlh, hdrlen) ->
 *   +----------------------+- - -+--------------------------------+
 *   |     Family Header    | Pad |           Attributes           |
 *   +----------------------+- - -+--------------------------------+
 *   nlmsg_attrdata(nlh, hdrlen)---^
 *
 * Data Structures:
 *   struct nlmsghdr                    netlink message header
 *
 * Message Construction:
 *   nlmsg_new()                        create a new netlink message
 *   nlmsg_put()                        add a netlink message to an skb
 *   nlmsg_put_answer()                 callback based nlmsg_put()
 *   nlmsg_end()                        finalize netlink message
 *   nlmsg_get_pos()                    return current position in message
 *   nlmsg_trim()                       trim part of message
 *   nlmsg_cancel()                     cancel message construction
 *   nlmsg_free()                       free a netlink message
 *
 * Message Sending:
 *   nlmsg_multicast()                  multicast message to several groups
 *   nlmsg_unicast()                    unicast a message to a single socket
 *   nlmsg_notify()                     send notification message
 *
 * Message Length Calculations:
 *   nlmsg_msg_size(payload)            length of message w/o padding
 *   nlmsg_total_size(payload)          length of message w/ padding
 *   nlmsg_padlen(payload)              length of padding at tail
 *
 * Message Payload Access:
 *   nlmsg_data(nlh)                    head of message payload
 *   nlmsg_len(nlh)                     length of message payload
 *   nlmsg_attrdata(nlh, hdrlen)        head of attributes data
 *   nlmsg_attrlen(nlh, hdrlen)         length of attributes data
 *
 * Message Parsing:
 *   nlmsg_ok(nlh, remaining)           does nlh fit into remaining bytes?
 *   nlmsg_next(nlh, remaining)         get next netlink message
 *   nlmsg_parse()                      parse attributes of a message
 *   nlmsg_find_attr()                  find an attribute in a message
 *   nlmsg_for_each_msg()               loop over all messages
 *   nlmsg_validate()                   validate netlink message incl. attrs
 *   nlmsg_for_each_attr()              loop over all attributes
 *
 * Misc:
 *   nlmsg_report()                     report back to application?
 *
 * ------------------------------------------------------------------------
 *                          Attributes Interface
 * ------------------------------------------------------------------------
 *
 * Attribute Format:
 *    <------- nla_total_size(payload) ------->
 *    <---- nla_attr_size(payload) ----->
 *   +----------+- - -+- - - - - - - - - +- - -+-------- - -
 *   |  Header  | Pad |     Payload      | Pad |  Header
 *   +----------+- - -+- - - - - - - - - +- - -+-------- - -
 *                     <- nla_len(nla) ->      ^
 *   nla_data(nla)----^                        |
 *   nla_next(nla)-----------------------------'
 *
 * Data Structures:
 *   struct nlattr                      netlink attribute header
 *
 * Attribute Construction:
 *   nla_reserve(skb, type, len)        reserve room for an attribute
 *   nla_reserve_nohdr(skb, len)        reserve room for an attribute w/o hdr
 *   nla_put(skb, type, len, data)      add attribute to skb
 *   nla_put_nohdr(skb, len, data)      add attribute w/o hdr
 *   nla_append(skb, len, data)         append data to skb
 *
 * Attribute Construction for Basic Types:
 *   nla_put_u8(skb, type, value)       add u8 attribute to skb
 *   nla_put_u16(skb, type, value)      add u16 attribute to skb
 *   nla_put_u32(skb, type, value)      add u32 attribute to skb
 *   nla_put_u64_64bit(skb, type,
 *                     value, padattr)  add u64 attribute to skb
 *   nla_put_s8(skb, type, value)       add s8 attribute to skb
 *   nla_put_s16(skb, type, value)      add s16 attribute to skb
 *   nla_put_s32(skb, type, value)      add s32 attribute to skb
 *   nla_put_s64(skb, type, value,
 *               padattr)               add s64 attribute to skb
 *   nla_put_string(skb, type, str)     add string attribute to skb
 *   nla_put_flag(skb, type)            add flag attribute to skb
 *   nla_put_msecs(skb, type, jiffies,
 *                 padattr)             add msecs attribute to skb
 *   nla_put_in_addr(skb, type, addr)   add IPv4 address attribute to skb
 *   nla_put_in6_addr(skb, type, addr)  add IPv6 address attribute to skb
 *
 * Nested Attributes Construction:
 *   nla_nest_start(skb, type)          start a nested attribute
 *   nla_nest_end(skb, nla)             finalize a nested attribute
 *   nla_nest_cancel(skb, nla)          cancel nested attribute construction
 *
 * Attribute Length Calculations:
 *   nla_attr_size(payload)             length of attribute w/o padding
 *   nla_total_size(payload)            length of attribute w/ padding
 *   nla_padlen(payload)                length of padding
 *
 * Attribute Payload Access:
 *   nla_data(nla)                      head of attribute payload
 *   nla_len(nla)                       length of attribute payload
 *
 * Attribute Payload Access for Basic Types:
 *   nla_get_u8(nla)                    get payload for a u8 attribute
 *   nla_get_u16(nla)                   get payload for a u16 attribute
 *   nla_get_u32(nla)                   get payload for a u32 attribute
 *   nla_get_u64(nla)                   get payload for a u64 attribute
 *   nla_get_s8(nla)                    get payload for a s8 attribute
 *   nla_get_s16(nla)                   get payload for a s16 attribute
 *   nla_get_s32(nla)                   get payload for a s32 attribute
 *   nla_get_s64(nla)                   get payload for a s64 attribute
 *   nla_get_flag(nla)                  return 1 if flag is true
 *   nla_get_msecs(nla)                 get payload for a msecs attribute
 *
 * Attribute Misc:
 *   nla_memcpy(dest, nla, count)       copy attribute into memory
 *   nla_memcmp(nla, data, size)        compare attribute with memory area
 *   nla_strlcpy(dst, nla, size)        copy attribute to a sized string
 *   nla_strcmp(nla, str)               compare attribute with string
 *
 * Attribute Parsing:
 *   nla_ok(nla, remaining)             does nla fit into remaining bytes?
 *   nla_next(nla, remaining)           get next netlink attribute
 *   nla_validate()                     validate a stream of attributes
 *   nla_validate_nested()              validate a stream of nested attributes
 *   nla_find()                         find attribute in stream of attributes
 *   nla_find_nested()                  find attribute in nested attributes
 *   nla_parse()                        parse and validate stream of attrs
 *   nla_parse_nested()                 parse nested attribuets
 *   nla_for_each_attr()                loop over all attributes
 *   nla_for_each_nested()              loop over the nested attributes
 *=========================================================================
 */

 /**
  * Standard attribute types to specify validation policy
  */
enum {
        NLA_UNSPEC,
        NLA_U8,
        NLA_U16,
        NLA_U32,
        NLA_U64,
        NLA_STRING,
        NLA_FLAG,
        NLA_MSECS,
        NLA_NESTED,
        NLA_NESTED_ARRAY,
        NLA_NUL_STRING,
        NLA_BINARY,
        NLA_S8,
        NLA_S16,
        NLA_S32,
        NLA_S64,
        NLA_BITFIELD32,
        NLA_REJECT,
        NLA_EXACT_LEN,
        NLA_EXACT_LEN_WARN,
        __NLA_TYPE_MAX,
};

#define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1)

enum nla_policy_validation {
        NLA_VALIDATE_NONE,
        NLA_VALIDATE_RANGE,
        NLA_VALIDATE_MIN,
        NLA_VALIDATE_MAX,
        NLA_VALIDATE_FUNCTION,
};

/**
 * struct nla_policy - attribute validation policy
 * @type: Type of attribute or NLA_UNSPEC
 * @validation_type: type of attribute validation done in addition to
 *      type-specific validation (e.g. range, function call), see
 *      &enum nla_policy_validation
 * @len: Type specific length of payload
 *
 * Policies are defined as arrays of this struct, the array must be
 * accessible by attribute type up to the highest identifier to be expected.
 *
 * Meaning of `len' field:
 *    NLA_STRING           Maximum length of string
 *    NLA_NUL_STRING       Maximum length of string (excluding NUL)
 *    NLA_FLAG             Unused
 *    NLA_BINARY           Maximum length of attribute payload
 *    NLA_NESTED,
 *    NLA_NESTED_ARRAY     Length verification is done by checking len of
 *                         nested header (or empty); len field is used if
 *                         validation_data is also used, for the max attr
 *                         number in the nested policy.
 *    NLA_U8, NLA_U16,
 *    NLA_U32, NLA_U64,
 *    NLA_S8, NLA_S16,
 *    NLA_S32, NLA_S64,
 *    NLA_MSECS            Leaving the length field zero will verify the
 *                         given type fits, using it verifies minimum length
 *                         just like "All other"
 *    NLA_BITFIELD32       Unused
 *    NLA_REJECT           Unused
 *    NLA_EXACT_LEN        Attribute must have exactly this length, otherwise
 *                         it is rejected.
 *    NLA_EXACT_LEN_WARN   Attribute should have exactly this length, a warning
 *                         is logged if it is longer, shorter is rejected.
 *    All other            Minimum length of attribute payload
 *
 * Meaning of `validation_data' field:
 *    NLA_BITFIELD32       This is a 32-bit bitmap/bitselector attribute and
 *                         validation data must point to a u32 value of valid
 *                         flags
 *    NLA_REJECT           This attribute is always rejected and validation data
 *                         may point to a string to report as the error instead
 *                         of the generic one in extended ACK.
 *    NLA_NESTED           Points to a nested policy to validate, must also set
 *                         `len' to the max attribute number.
 *                         Note that nla_parse() will validate, but of course not
 *                         parse, the nested sub-policies.
 *    NLA_NESTED_ARRAY     Points to a nested policy to validate, must also set
 *                         `len' to the max attribute number. The difference to
 *                         NLA_NESTED is the structure - NLA_NESTED has the
 *                         nested attributes directly inside, while an array has
 *                         the nested attributes at another level down and the
 *                         attributes directly in the nesting don't matter.
 *    All other            Unused - but note that it's a union
 *
 * Meaning of `min' and `max' fields, use via NLA_POLICY_MIN, NLA_POLICY_MAX
 * and NLA_POLICY_RANGE:
 *    NLA_U8,
 *    NLA_U16,
 *    NLA_U32,
 *    NLA_U64,
 *    NLA_S8,
 *    NLA_S16,
 *    NLA_S32,
 *    NLA_S64              These are used depending on the validation_type
 *                         field, if that is min/max/range then the minimum,
 *                         maximum and both are used (respectively) to check
 *                         the value of the integer attribute.
 *                         Note that in the interest of code simplicity and
 *                         struct size both limits are s16, so you cannot
 *                         enforce a range that doesn't fall within the range
 *                         of s16 - do that as usual in the code instead.
 *    All other            Unused - but note that it's a union
 *
 * Meaning of `validate' field, use via NLA_POLICY_VALIDATE_FN:
 *    NLA_BINARY           Validation function called for the attribute,
 *                         not compatible with use of the validation_data
 *                         as in NLA_BITFIELD32, NLA_REJECT, NLA_NESTED and
 *                         NLA_NESTED_ARRAY.
 *    All other            Unused - but note that it's a union
 *
 * Example:
 * static const struct nla_policy my_policy[ATTR_MAX+1] = {
 *      [ATTR_FOO] = { .type = NLA_U16 },
 *      [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ },
 *      [ATTR_BAZ] = { .len = sizeof(struct mystruct) },
 *      [ATTR_GOO] = { .type = NLA_BITFIELD32, .validation_data = &myvalidflags },
 * };
 */
struct nla_policy {
        u8              type;
        u8              validation_type;
        u16             len;
        union {
                const void *validation_data;
                struct {
                        s16 min, max;
                };
                int (*validate)(const struct nlattr *attr,
                                struct netlink_ext_ack *extack);
        };
};

#define NLA_POLICY_EXACT_LEN(_len)      { .type = NLA_EXACT_LEN, .len = _len }
#define NLA_POLICY_EXACT_LEN_WARN(_len) { .type = NLA_EXACT_LEN_WARN, \
                                          .len = _len }

#define NLA_POLICY_ETH_ADDR             NLA_POLICY_EXACT_LEN(ETH_ALEN)
#define NLA_POLICY_ETH_ADDR_COMPAT      NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN)

#define NLA_POLICY_NESTED(maxattr, policy) \
        { .type = NLA_NESTED, .validation_data = policy, .len = maxattr }
#define NLA_POLICY_NESTED_ARRAY(maxattr, policy) \
        { .type = NLA_NESTED_ARRAY, .validation_data = policy, .len = maxattr }

#define __NLA_ENSURE(condition) (sizeof(char[1 - 2*!(condition)]) - 1)
#define NLA_ENSURE_INT_TYPE(tp)                         \
        (__NLA_ENSURE(tp == NLA_S8 || tp == NLA_U8 ||   \
                      tp == NLA_S16 || tp == NLA_U16 || \
                      tp == NLA_S32 || tp == NLA_U32 || \
                      tp == NLA_S64 || tp == NLA_U64) + tp)
#define NLA_ENSURE_NO_VALIDATION_PTR(tp)                \
        (__NLA_ENSURE(tp != NLA_BITFIELD32 &&           \
                      tp != NLA_REJECT &&               \
                      tp != NLA_NESTED &&               \
                      tp != NLA_NESTED_ARRAY) + tp)

#define NLA_POLICY_RANGE(tp, _min, _max) {              \
        .type = NLA_ENSURE_INT_TYPE(tp),                \
        .validation_type = NLA_VALIDATE_RANGE,          \
        .min = _min,                                    \
        .max = _max                                     \
}

#define NLA_POLICY_MIN(tp, _min) {                      \
        .type = NLA_ENSURE_INT_TYPE(tp),                \
        .validation_type = NLA_VALIDATE_MIN,            \
        .min = _min,                                    \
}

#define NLA_POLICY_MAX(tp, _max) {                      \
        .type = NLA_ENSURE_INT_TYPE(tp),                \
        .validation_type = NLA_VALIDATE_MAX,            \
        .max = _max,                                    \
}

#define NLA_POLICY_VALIDATE_FN(tp, fn, ...) {           \
        .type = NLA_ENSURE_NO_VALIDATION_PTR(tp),       \
        .validation_type = NLA_VALIDATE_FUNCTION,       \
        .validate = fn,                                 \
        .len = __VA_ARGS__ + 0,                         \
}

/**
 * struct nl_info - netlink source information
 * @nlh: Netlink message header of original request
 * @portid: Netlink PORTID of requesting application
 */
struct nl_info {
        struct nlmsghdr         *nlh;
        struct net              *nl_net;
        u32                     portid;
        bool                    skip_notify;
};

int netlink_rcv_skb(struct sk_buff *skb,
                    int (*cb)(struct sk_buff *, struct nlmsghdr *,
                              struct netlink_ext_ack *));
int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid,
                 unsigned int group, int report, gfp_t flags);

int nla_validate(const struct nlattr *head, int len, int maxtype,
                 const struct nla_policy *policy,
                 struct netlink_ext_ack *extack);
int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head,
              int len, const struct nla_policy *policy,
              struct netlink_ext_ack *extack);
int nla_policy_len(const struct nla_policy *, int);
struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype);
size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize);
char *nla_strdup(const struct nlattr *nla, gfp_t flags);
int nla_memcpy(void *dest, const struct nlattr *src, int count);
int nla_memcmp(const struct nlattr *nla, const void *data, size_t size);
int nla_strcmp(const struct nlattr *nla, const char *str);
struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen);
struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype,
                                   int attrlen, int padattr);
void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen);
struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen);
struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype,
                                 int attrlen, int padattr);
void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen);
void __nla_put(struct sk_buff *skb, int attrtype, int attrlen,
               const void *data);
void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen,
                     const void *data, int padattr);
void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data);
int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data);
int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen,
                  const void *data, int padattr);
int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data);
int nla_append(struct sk_buff *skb, int attrlen, const void *data);

/**************************************************************************
 * Netlink Messages
 **************************************************************************/

/**
 * nlmsg_msg_size - length of netlink message not including padding
 * @payload: length of message payload
 */
static inline int nlmsg_msg_size(int payload)
{
        return NLMSG_HDRLEN + payload;
}

/**
 * nlmsg_total_size - length of netlink message including padding
 * @payload: length of message payload
 */
static inline int nlmsg_total_size(int payload)
{
        return NLMSG_ALIGN(nlmsg_msg_size(payload));
}

/**
 * nlmsg_padlen - length of padding at the message's tail
 * @payload: length of message payload
 */
static inline int nlmsg_padlen(int payload)
{
        return nlmsg_total_size(payload) - nlmsg_msg_size(payload);
}

/**
 * nlmsg_data - head of message payload
 * @nlh: netlink message header
 */
static inline void *nlmsg_data(const struct nlmsghdr *nlh)
{
        return (unsigned char *) nlh + NLMSG_HDRLEN;
}

/**
 * nlmsg_len - length of message payload
 * @nlh: netlink message header
 */
static inline int nlmsg_len(const struct nlmsghdr *nlh)
{
        return nlh->nlmsg_len - NLMSG_HDRLEN;
}

/**
 * nlmsg_attrdata - head of attributes data
 * @nlh: netlink message header
 * @hdrlen: length of family specific header
 */
static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh,
                                            int hdrlen)
{
        unsigned char *data = nlmsg_data(nlh);
        return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen));
}

/**
 * nlmsg_attrlen - length of attributes data
 * @nlh: netlink message header
 * @hdrlen: length of family specific header
 */
static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen)
{
        return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen);
}

/**
 * nlmsg_ok - check if the netlink message fits into the remaining bytes
 * @nlh: netlink message header
 * @remaining: number of bytes remaining in message stream
 */
static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining)
{
        return (remaining >= (int) sizeof(struct nlmsghdr) &&
                nlh->nlmsg_len >= sizeof(struct nlmsghdr) &&
                nlh->nlmsg_len <= remaining);
}

/**
 * nlmsg_next - next netlink message in message stream
 * @nlh: netlink message header
 * @remaining: number of bytes remaining in message stream
 *
 * Returns the next netlink message in the message stream and
 * decrements remaining by the size of the current message.
 */
static inline struct nlmsghdr *
nlmsg_next(const struct nlmsghdr *nlh, int *remaining)
{
        int totlen = NLMSG_ALIGN(nlh->nlmsg_len);

        *remaining -= totlen;

        return (struct nlmsghdr *) ((unsigned char *) nlh + totlen);
}

/**
 * nlmsg_parse - parse attributes of a netlink message
 * @nlh: netlink message header
 * @hdrlen: length of family specific header
 * @tb: destination array with maxtype+1 elements
 * @maxtype: maximum attribute type to be expected
 * @policy: validation policy
 * @extack: extended ACK report struct
 *
 * See nla_parse()
 */
static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen,
                              struct nlattr *tb[], int maxtype,
                              const struct nla_policy *policy,
                              struct netlink_ext_ack *extack)
{
        if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
                return -EINVAL;

        return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen),
                         nlmsg_attrlen(nlh, hdrlen), policy, extack);
}

/**
 * nlmsg_find_attr - find a specific attribute in a netlink message
 * @nlh: netlink message header
 * @hdrlen: length of familiy specific header
 * @attrtype: type of attribute to look for
 *
 * Returns the first attribute which matches the specified type.
 */
static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh,
                                             int hdrlen, int attrtype)
{
        return nla_find(nlmsg_attrdata(nlh, hdrlen),
                        nlmsg_attrlen(nlh, hdrlen), attrtype);
}

/**
 * nlmsg_validate - validate a netlink message including attributes
 * @nlh: netlinket message header
 * @hdrlen: length of familiy specific header
 * @maxtype: maximum attribute type to be expected
 * @policy: validation policy
 * @extack: extended ACK report struct
 */
static inline int nlmsg_validate(const struct nlmsghdr *nlh,
                                 int hdrlen, int maxtype,
                                 const struct nla_policy *policy,
                                 struct netlink_ext_ack *extack)
{
        if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
                return -EINVAL;

        return nla_validate(nlmsg_attrdata(nlh, hdrlen),
                            nlmsg_attrlen(nlh, hdrlen), maxtype, policy,
                            extack);
}

/**
 * nlmsg_report - need to report back to application?
 * @nlh: netlink message header
 *
 * Returns 1 if a report back to the application is requested.
 */
static inline int nlmsg_report(const struct nlmsghdr *nlh)
{
        return !!(nlh->nlmsg_flags & NLM_F_ECHO);
}

/**
 * nlmsg_for_each_attr - iterate over a stream of attributes
 * @pos: loop counter, set to current attribute
 * @nlh: netlink message header
 * @hdrlen: length of familiy specific header
 * @rem: initialized to len, holds bytes currently remaining in stream
 */
#define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \
        nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \
                          nlmsg_attrlen(nlh, hdrlen), rem)

/**
 * nlmsg_put - Add a new netlink message to an skb
 * @skb: socket buffer to store message in
 * @portid: netlink PORTID of requesting application
 * @seq: sequence number of message
 * @type: message type
 * @payload: length of message payload
 * @flags: message flags
 *
 * Returns NULL if the tailroom of the skb is insufficient to store
 * the message header and payload.
 */
static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
                                         int type, int payload, int flags)
{
        if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload)))
                return NULL;

        return __nlmsg_put(skb, portid, seq, type, payload, flags);
}

/**
 * nlmsg_put_answer - Add a new callback based netlink message to an skb
 * @skb: socket buffer to store message in
 * @cb: netlink callback
 * @type: message type
 * @payload: length of message payload
 * @flags: message flags
 *
 * Returns NULL if the tailroom of the skb is insufficient to store
 * the message header and payload.
 */
static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb,
                                                struct netlink_callback *cb,
                                                int type, int payload,
                                                int flags)
{
        return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
                         type, payload, flags);
}

/**
 * nlmsg_new - Allocate a new netlink message
 * @payload: size of the message payload
 * @flags: the type of memory to allocate.
 *
 * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known
 * and a good default is needed.
 */
static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags)
{
        return alloc_skb(nlmsg_total_size(payload), flags);
}

/**
 * nlmsg_end - Finalize a netlink message
 * @skb: socket buffer the message is stored in
 * @nlh: netlink message header
 *
 * Corrects the netlink message header to include the appeneded
 * attributes. Only necessary if attributes have been added to
 * the message.
 */
static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh)
{
        nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
}

/**
 * nlmsg_get_pos - return current position in netlink message
 * @skb: socket buffer the message is stored in
 *
 * Returns a pointer to the current tail of the message.
 */
static inline void *nlmsg_get_pos(struct sk_buff *skb)
{
        return skb_tail_pointer(skb);
}

/**
 * nlmsg_trim - Trim message to a mark
 * @skb: socket buffer the message is stored in
 * @mark: mark to trim to
 *
 * Trims the message to the provided mark.
 */
static inline void nlmsg_trim(struct sk_buff *skb, const void *mark)
{
        if (mark) {
                WARN_ON((unsigned char *) mark < skb->data);
                skb_trim(skb, (unsigned char *) mark - skb->data);
        }
}

/**
 * nlmsg_cancel - Cancel construction of a netlink message
 * @skb: socket buffer the message is stored in
 * @nlh: netlink message header
 *
 * Removes the complete netlink message including all
 * attributes from the socket buffer again.
 */
static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh)
{
        nlmsg_trim(skb, nlh);
}

/**
 * nlmsg_free - free a netlink message
 * @skb: socket buffer of netlink message
 */
static inline void nlmsg_free(struct sk_buff *skb)
{
        kfree_skb(skb);
}

/**
 * nlmsg_multicast - multicast a netlink message
 * @sk: netlink socket to spread messages to
 * @skb: netlink message as socket buffer
 * @portid: own netlink portid to avoid sending to yourself
 * @group: multicast group id
 * @flags: allocation flags
 */
static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb,
                                  u32 portid, unsigned int group, gfp_t flags)
{
        int err;

        NETLINK_CB(skb).dst_group = group;

        err = netlink_broadcast(sk, skb, portid, group, flags);
        if (err > 0)
                err = 0;

        return err;
}

/**
 * nlmsg_unicast - unicast a netlink message
 * @sk: netlink socket to spread message to
 * @skb: netlink message as socket buffer
 * @portid: netlink portid of the destination socket
 */
static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid)
{
        int err;

        err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT);
        if (err > 0)
                err = 0;

        return err;
}

/**
 * nlmsg_for_each_msg - iterate over a stream of messages
 * @pos: loop counter, set to current message
 * @head: head of message stream
 * @len: length of message stream
 * @rem: initialized to len, holds bytes currently remaining in stream
 */
#define nlmsg_for_each_msg(pos, head, len, rem) \
        for (pos = head, rem = len; \
             nlmsg_ok(pos, rem); \
             pos = nlmsg_next(pos, &(rem)))

/**
 * nl_dump_check_consistent - check if sequence is consistent and advertise if not
 * @cb: netlink callback structure that stores the sequence number
 * @nlh: netlink message header to write the flag to
 *
 * This function checks if the sequence (generation) number changed during dump
 * and if it did, advertises it in the netlink message header.
 *
 * The correct way to use it is to set cb->seq to the generation counter when
 * all locks for dumping have been acquired, and then call this function for
 * each message that is generated.
 *
 * Note that due to initialisation concerns, 0 is an invalid sequence number
 * and must not be used by code that uses this functionality.
 */
static inline void
nl_dump_check_consistent(struct netlink_callback *cb,
                         struct nlmsghdr *nlh)
{
        if (cb->prev_seq && cb->seq != cb->prev_seq)
                nlh->nlmsg_flags |= NLM_F_DUMP_INTR;
        cb->prev_seq = cb->seq;
}

/**************************************************************************
 * Netlink Attributes
 **************************************************************************/

/**
 * nla_attr_size - length of attribute not including padding
 * @payload: length of payload
 */
static inline int nla_attr_size(int payload)
{
        return NLA_HDRLEN + payload;
}

/**
 * nla_total_size - total length of attribute including padding
 * @payload: length of payload
 */
static inline int nla_total_size(int payload)
{
        return NLA_ALIGN(nla_attr_size(payload));
}

/**
 * nla_padlen - length of padding at the tail of attribute
 * @payload: length of payload
 */
static inline int nla_padlen(int payload)
{
        return nla_total_size(payload) - nla_attr_size(payload);
}

/**
 * nla_type - attribute type
 * @nla: netlink attribute
 */
static inline int nla_type(const struct nlattr *nla)
{
        return nla->nla_type & NLA_TYPE_MASK;
}

/**
 * nla_data - head of payload
 * @nla: netlink attribute
 */
static inline void *nla_data(const struct nlattr *nla)
{
        return (char *) nla + NLA_HDRLEN;
}

/**
 * nla_len - length of payload
 * @nla: netlink attribute
 */
static inline int nla_len(const struct nlattr *nla)
{
        return nla->nla_len - NLA_HDRLEN;
}

/**
 * nla_ok - check if the netlink attribute fits into the remaining bytes
 * @nla: netlink attribute
 * @remaining: number of bytes remaining in attribute stream
 */
static inline int nla_ok(const struct nlattr *nla, int remaining)
{
        return remaining >= (int) sizeof(*nla) &&
               nla->nla_len >= sizeof(*nla) &&
               nla->nla_len <= remaining;
}

/**
 * nla_next - next netlink attribute in attribute stream
 * @nla: netlink attribute
 * @remaining: number of bytes remaining in attribute stream
 *
 * Returns the next netlink attribute in the attribute stream and
 * decrements remaining by the size of the current attribute.
 */
static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining)
{
        unsigned int totlen = NLA_ALIGN(nla->nla_len);

        *remaining -= totlen;
        return (struct nlattr *) ((char *) nla + totlen);
}

/**
 * nla_find_nested - find attribute in a set of nested attributes
 * @nla: attribute containing the nested attributes
 * @attrtype: type of attribute to look for
 *
 * Returns the first attribute which matches the specified type.
 */
static inline struct nlattr *
nla_find_nested(const struct nlattr *nla, int attrtype)
{
        return nla_find(nla_data(nla), nla_len(nla), attrtype);
}

/**
 * nla_parse_nested - parse nested attributes
 * @tb: destination array with maxtype+1 elements
 * @maxtype: maximum attribute type to be expected
 * @nla: attribute containing the nested attributes
 * @policy: validation policy
 * @extack: extended ACK report struct
 *
 * See nla_parse()
 */
static inline int nla_parse_nested(struct nlattr *tb[], int maxtype,
                                   const struct nlattr *nla,
                                   const struct nla_policy *policy,
                                   struct netlink_ext_ack *extack)
{
        return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy,
                         extack);
}

/**
 * nla_put_u8 - Add a u8 netlink attribute to a socket buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 */
static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value)
{
        /* temporary variables to work around GCC PR81715 with asan-stack=1 */
        u8 tmp = value;

        return nla_put(skb, attrtype, sizeof(u8), &tmp);
}

/**
 * nla_put_u16 - Add a u16 netlink attribute to a socket buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 */
static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value)
{
        u16 tmp = value;

        return nla_put(skb, attrtype, sizeof(u16), &tmp);
}

/**
 * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 */
static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value)
{
        __be16 tmp = value;

        return nla_put(skb, attrtype, sizeof(__be16), &tmp);
}

/**
 * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 */
static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value)
{
        __be16 tmp = value;

        return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, tmp);
}

/**
 * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 */
static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value)
{
        __le16 tmp = value;

        return nla_put(skb, attrtype, sizeof(__le16), &tmp);
}

/**
 * nla_put_u32 - Add a u32 netlink attribute to a socket buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 */
static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value)
{
        u32 tmp = value;

        return nla_put(skb, attrtype, sizeof(u32), &tmp);
}

/**
 * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 */
static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value)
{
        __be32 tmp = value;

        return nla_put(skb, attrtype, sizeof(__be32), &tmp);
}

/**
 * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 */
static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value)
{
        __be32 tmp = value;

        return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, tmp);
}

/**
 * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 */
static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value)
{
        __le32 tmp = value;

        return nla_put(skb, attrtype, sizeof(__le32), &tmp);
}

/**
 * nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 * @padattr: attribute type for the padding
 */
static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype,
                                    u64 value, int padattr)
{
        u64 tmp = value;

        return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr);
}

/**
 * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 * @padattr: attribute type for the padding
 */
static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value,
                               int padattr)
{
        __be64 tmp = value;

        return nla_put_64bit(skb, attrtype, sizeof(__be64), &tmp, padattr);
}

/**
 * nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 * @padattr: attribute type for the padding
 */
static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value,
                                int padattr)
{
        __be64 tmp = value;

        return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, tmp,
                            padattr);
}

/**
 * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer and align it
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 * @padattr: attribute type for the padding
 */
static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value,
                               int padattr)
{
        __le64 tmp = value;

        return nla_put_64bit(skb, attrtype, sizeof(__le64), &tmp, padattr);
}

/**
 * nla_put_s8 - Add a s8 netlink attribute to a socket buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 */
static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value)
{
        s8 tmp = value;

        return nla_put(skb, attrtype, sizeof(s8), &tmp);
}

/**
 * nla_put_s16 - Add a s16 netlink attribute to a socket buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 */
static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value)
{
        s16 tmp = value;

        return nla_put(skb, attrtype, sizeof(s16), &tmp);
}

/**
 * nla_put_s32 - Add a s32 netlink attribute to a socket buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 */
static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value)
{
        s32 tmp = value;

        return nla_put(skb, attrtype, sizeof(s32), &tmp);
}

/**
 * nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @value: numeric value
 * @padattr: attribute type for the padding
 */
static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value,
                              int padattr)
{
        s64 tmp = value;

        return nla_put_64bit(skb, attrtype, sizeof(s64), &tmp, padattr);
}

/**
 * nla_put_string - Add a string netlink attribute to a socket buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @str: NUL terminated string
 */
static inline int nla_put_string(struct sk_buff *skb, int attrtype,
                                 const char *str)
{
        return nla_put(skb, attrtype, strlen(str) + 1, str);
}

/**
 * nla_put_flag - Add a flag netlink attribute to a socket buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 */
static inline int nla_put_flag(struct sk_buff *skb, int attrtype)
{
        return nla_put(skb, attrtype, 0, NULL);
}

/**
 * nla_put_msecs - Add a msecs netlink attribute to a skb and align it
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @njiffies: number of jiffies to convert to msecs
 * @padattr: attribute type for the padding
 */
static inline int nla_put_msecs(struct sk_buff *skb, int attrtype,
                                unsigned long njiffies, int padattr)
{
        u64 tmp = jiffies_to_msecs(njiffies);

        return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr);
}

/**
 * nla_put_in_addr - Add an IPv4 address netlink attribute to a socket
 * buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @addr: IPv4 address
 */
static inline int nla_put_in_addr(struct sk_buff *skb, int attrtype,
                                  __be32 addr)
{
        __be32 tmp = addr;

        return nla_put_be32(skb, attrtype, tmp);
}

/**
 * nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket
 * buffer
 * @skb: socket buffer to add attribute to
 * @attrtype: attribute type
 * @addr: IPv6 address
 */
static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype,
                                   const struct in6_addr *addr)
{
        return nla_put(skb, attrtype, sizeof(*addr), addr);
}

/**
 * nla_get_u32 - return payload of u32 attribute
 * @nla: u32 netlink attribute
 */
static inline u32 nla_get_u32(const struct nlattr *nla)
{
        return *(u32 *) nla_data(nla);
}

/**
 * nla_get_be32 - return payload of __be32 attribute
 * @nla: __be32 netlink attribute
 */
static inline __be32 nla_get_be32(const struct nlattr *nla)
{
        return *(__be32 *) nla_data(nla);
}

/**
 * nla_get_le32 - return payload of __le32 attribute
 * @nla: __le32 netlink attribute
 */
static inline __le32 nla_get_le32(const struct nlattr *nla)
{
        return *(__le32 *) nla_data(nla);
}

/**
 * nla_get_u16 - return payload of u16 attribute
 * @nla: u16 netlink attribute
 */
static inline u16 nla_get_u16(const struct nlattr *nla)
{
        return *(u16 *) nla_data(nla);
}

/**
 * nla_get_be16 - return payload of __be16 attribute
 * @nla: __be16 netlink attribute
 */
static inline __be16 nla_get_be16(const struct nlattr *nla)
{
        return *(__be16 *) nla_data(nla);
}

/**
 * nla_get_le16 - return payload of __le16 attribute
 * @nla: __le16 netlink attribute
 */
static inline __le16 nla_get_le16(const struct nlattr *nla)
{
        return *(__le16 *) nla_data(nla);
}

/**
 * nla_get_u8 - return payload of u8 attribute
 * @nla: u8 netlink attribute
 */
static inline u8 nla_get_u8(const struct nlattr *nla)
{
        return *(u8 *) nla_data(nla);
}

/**
 * nla_get_u64 - return payload of u64 attribute
 * @nla: u64 netlink attribute
 */
static inline u64 nla_get_u64(const struct nlattr *nla)
{
        u64 tmp;

        nla_memcpy(&tmp, nla, sizeof(tmp));

        return tmp;
}

/**
 * nla_get_be64 - return payload of __be64 attribute
 * @nla: __be64 netlink attribute
 */
static inline __be64 nla_get_be64(const struct nlattr *nla)
{
        __be64 tmp;

        nla_memcpy(&tmp, nla, sizeof(tmp));

        return tmp;
}

/**
 * nla_get_le64 - return payload of __le64 attribute
 * @nla: __le64 netlink attribute
 */
static inline __le64 nla_get_le64(const struct nlattr *nla)
{
        return *(__le64 *) nla_data(nla);
}

/**
 * nla_get_s32 - return payload of s32 attribute
 * @nla: s32 netlink attribute
 */
static inline s32 nla_get_s32(const struct nlattr *nla)
{
        return *(s32 *) nla_data(nla);
}

/**
 * nla_get_s16 - return payload of s16 attribute
 * @nla: s16 netlink attribute
 */
static inline s16 nla_get_s16(const struct nlattr *nla)
{
        return *(s16 *) nla_data(nla);
}

/**
 * nla_get_s8 - return payload of s8 attribute
 * @nla: s8 netlink attribute
 */
static inline s8 nla_get_s8(const struct nlattr *nla)
{
        return *(s8 *) nla_data(nla);
}

/**
 * nla_get_s64 - return payload of s64 attribute
 * @nla: s64 netlink attribute
 */
static inline s64 nla_get_s64(const struct nlattr *nla)
{
        s64 tmp;

        nla_memcpy(&tmp, nla, sizeof(tmp));

        return tmp;
}

/**
 * nla_get_flag - return payload of flag attribute
 * @nla: flag netlink attribute
 */
static inline int nla_get_flag(const struct nlattr *nla)
{
        return !!nla;
}

/**
 * nla_get_msecs - return payload of msecs attribute
 * @nla: msecs netlink attribute
 *
 * Returns the number of milliseconds in jiffies.
 */
static inline unsigned long nla_get_msecs(const struct nlattr *nla)
{
        u64 msecs = nla_get_u64(nla);

        return msecs_to_jiffies((unsigned long) msecs);
}

/**
 * nla_get_in_addr - return payload of IPv4 address attribute
 * @nla: IPv4 address netlink attribute
 */
static inline __be32 nla_get_in_addr(const struct nlattr *nla)
{
        return *(__be32 *) nla_data(nla);
}

/**
 * nla_get_in6_addr - return payload of IPv6 address attribute
 * @nla: IPv6 address netlink attribute
 */
static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla)
{
        struct in6_addr tmp;

        nla_memcpy(&tmp, nla, sizeof(tmp));
        return tmp;
}

/**
 * nla_get_bitfield32 - return payload of 32 bitfield attribute
 * @nla: nla_bitfield32 attribute
 */
static inline struct nla_bitfield32 nla_get_bitfield32(const struct nlattr *nla)
{
        struct nla_bitfield32 tmp;

        nla_memcpy(&tmp, nla, sizeof(tmp));
        return tmp;
}

/**
 * nla_memdup - duplicate attribute memory (kmemdup)
 * @src: netlink attribute to duplicate from
 * @gfp: GFP mask
 */
static inline void *nla_memdup(const struct nlattr *src, gfp_t gfp)
{
        return kmemdup(nla_data(src), nla_len(src), gfp);
}

/**
 * nla_nest_start - Start a new level of nested attributes
 * @skb: socket buffer to add attributes to
 * @attrtype: attribute type of container
 *
 * Returns the container attribute
 */
static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype)
{
        struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb);

        if (nla_put(skb, attrtype, 0, NULL) < 0)
                return NULL;

        return start;
}

/**
 * nla_nest_end - Finalize nesting of attributes
 * @skb: socket buffer the attributes are stored in
 * @start: container attribute
 *
 * Corrects the container attribute header to include the all
 * appeneded attributes.
 *
 * Returns the total data length of the skb.
 */
static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start)
{
        start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start;
        return skb->len;
}

/**
 * nla_nest_cancel - Cancel nesting of attributes
 * @skb: socket buffer the message is stored in
 * @start: container attribute
 *
 * Removes the container attribute and including all nested
 * attributes. Returns -EMSGSIZE
 */
static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start)
{
        nlmsg_trim(skb, start);
}

/**
 * nla_validate_nested - Validate a stream of nested attributes
 * @start: container attribute
 * @maxtype: maximum attribute type to be expected
 * @policy: validation policy
 * @extack: extended ACK report struct
 *
 * Validates all attributes in the nested attribute stream against the
 * specified policy. Attributes with a type exceeding maxtype will be
 * ignored. See documenation of struct nla_policy for more details.
 *
 * Returns 0 on success or a negative error code.
 */
static inline int nla_validate_nested(const struct nlattr *start, int maxtype,
                                      const struct nla_policy *policy,
                                      struct netlink_ext_ack *extack)
{
        return nla_validate(nla_data(start), nla_len(start), maxtype, policy,
                            extack);
}

/**
 * nla_need_padding_for_64bit - test 64-bit alignment of the next attribute
 * @skb: socket buffer the message is stored in
 *
 * Return true if padding is needed to align the next attribute (nla_data()) to
 * a 64-bit aligned area.
 */
static inline bool nla_need_padding_for_64bit(struct sk_buff *skb)
{
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
        /* The nlattr header is 4 bytes in size, that's why we test
         * if the skb->data _is_ aligned.  A NOP attribute, plus
         * nlattr header for next attribute, will make nla_data()
         * 8-byte aligned.
         */
        if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb), 8))
                return true;
#endif
        return false;
}

/**
 * nla_align_64bit - 64-bit align the nla_data() of next attribute
 * @skb: socket buffer the message is stored in
 * @padattr: attribute type for the padding
 *
 * Conditionally emit a padding netlink attribute in order to make
 * the next attribute we emit have a 64-bit aligned nla_data() area.
 * This will only be done in architectures which do not have
 * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined.
 *
 * Returns zero on success or a negative error code.
 */
static inline int nla_align_64bit(struct sk_buff *skb, int padattr)
{
        if (nla_need_padding_for_64bit(skb) &&
            !nla_reserve(skb, padattr, 0))
                return -EMSGSIZE;

        return 0;
}

/**
 * nla_total_size_64bit - total length of attribute including padding
 * @payload: length of payload
 */
static inline int nla_total_size_64bit(int payload)
{
        return NLA_ALIGN(nla_attr_size(payload))
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
                + NLA_ALIGN(nla_attr_size(0))
#endif
                ;
}

/**
 * nla_for_each_attr - iterate over a stream of attributes
 * @pos: loop counter, set to current attribute
 * @head: head of attribute stream
 * @len: length of attribute stream
 * @rem: initialized to len, holds bytes currently remaining in stream
 */
#define nla_for_each_attr(pos, head, len, rem) \
        for (pos = head, rem = len; \
             nla_ok(pos, rem); \
             pos = nla_next(pos, &(rem)))

/**
 * nla_for_each_nested - iterate over nested attributes
 * @pos: loop counter, set to current attribute
 * @nla: attribute containing the nested attributes
 * @rem: initialized to len, holds bytes currently remaining in stream
 */
#define nla_for_each_nested(pos, nla, rem) \
        nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem)

/**
 * nla_is_last - Test if attribute is last in stream
 * @nla: attribute to test
 * @rem: bytes remaining in stream
 */
static inline bool nla_is_last(const struct nlattr *nla, int rem)
{
        return nla->nla_len == rem;
}

#endif