1 files changed, 877 insertions, 0 deletions

diff --git a/include/net/netlink.h b/include/net/netlink.h
new file mode 100644
index 000000000000..c99e22db9632
--- /dev/null
+++ b/include/net/netlink.h
@@ -0,0 +1,877 @@
+#ifndef __NET_NETLINK_H
+#define __NET_NETLINK_H
+
+#include <linux/types.h>
+#include <linux/netlink.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()                        finanlize netlink 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
+ *
+ * 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
+ *
+ * ------------------------------------------------------------------------
+ *                          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 attribtue header
+ *
+ * Attribute Construction:
+ *   nla_reserve(skb, type, len)        reserve skb tailroom for an attribute
+ *   nla_put(skb, type, len, data)      add attribute 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(skb, type, value)      add u64 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)  add msecs attribute to skb
+ *
+ * Exceptions Based Attribute Construction:
+ *   NLA_PUT(skb, type, len, data)      add attribute to skb
+ *   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(skb, type, value)      add u64 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)  add msecs attribute to skb
+ *
+ *   The meaning of these functions is equal to their lower case
+ *   variants but they jump to the label nla_put_failure in case
+ *   of a failure.
+ *
+ * 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_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_find()                         find attribute in stream of attributes
+ *   nla_parse()                        parse and validate stream of attrs
+ *   nla_parse_nested()                 parse nested attribuets
+ *   nla_for_each_attr()                loop over all 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_TYPE_MAX,
+};
+
+#define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1)
+
+/**
+ * struct nla_policy - attribute validation policy
+ * @type: Type of attribute or NLA_UNSPEC
+ * @minlen: Minimal length of payload required to be available
+ *
+ * Policies are defined as arrays of this struct, the array must be
+ * accessible by attribute type up to the highest identifier to be expected.
+ *
+ * Example:
+ * static struct nla_policy my_policy[ATTR_MAX+1] __read_mostly = {
+ *      [ATTR_FOO] = { .type = NLA_U16 },
+ *      [ATTR_BAR] = { .type = NLA_STRING },
+ *      [ATTR_BAZ] = { .minlen = sizeof(struct mystruct) },
+ * };
+ */
+struct nla_policy {
+        u16             type;
+        u16             minlen;
+};
+
+extern int              nla_validate(struct nlattr *head, int len, int maxtype,
+                                     struct nla_policy *policy);
+extern int              nla_parse(struct nlattr *tb[], int maxtype,
+                                  struct nlattr *head, int len,
+                                  struct nla_policy *policy);
+extern struct nlattr *  nla_find(struct nlattr *head, int len, int attrtype);
+extern size_t           nla_strlcpy(char *dst, const struct nlattr *nla,
+                                    size_t dstsize);
+extern int              nla_memcpy(void *dest, struct nlattr *src, int count);
+extern int              nla_memcmp(const struct nlattr *nla, const void *data,
+                                   size_t size);
+extern int              nla_strcmp(const struct nlattr *nla, const char *str);
+extern struct nlattr *  __nla_reserve(struct sk_buff *skb, int attrtype,
+                                      int attrlen);
+extern struct nlattr *  nla_reserve(struct sk_buff *skb, int attrtype,
+                                    int attrlen);
+extern void             __nla_put(struct sk_buff *skb, int attrtype,
+                                  int attrlen, const void *data);
+extern int              nla_put(struct sk_buff *skb, int attrtype,
+                                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 messsage 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 >= 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(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
+ *
+ * See nla_parse()
+ */
+static inline int nlmsg_parse(struct nlmsghdr *nlh, int hdrlen,
+                              struct nlattr *tb[], int maxtype,
+                              struct nla_policy *policy)
+{
+        if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
+                return -EINVAL;
+
+        return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen),
+                         nlmsg_attrlen(nlh, hdrlen), policy);
+}
+
+/**
+ * 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(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
+ */
+static inline int nlmsg_validate(struct nlmsghdr *nlh, int hdrlen, int maxtype,
+                                 struct nla_policy *policy)
+{
+        if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
+                return -EINVAL;
+
+        return nla_validate(nlmsg_attrdata(nlh, hdrlen),
+                            nlmsg_attrlen(nlh, hdrlen), maxtype, policy);
+}
+
+/**
+ * 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)
+
+#if 0
+/* FIXME: Enable once all users have been converted */
+
+/**
+ * __nlmsg_put - Add a new netlink message to an skb
+ * @skb: socket buffer to store message in
+ * @pid: netlink process id
+ * @seq: sequence number of message
+ * @type: message type
+ * @payload: length of message payload
+ * @flags: message flags
+ *
+ * The caller is responsible to ensure that the skb provides enough
+ * tailroom for both the netlink header and payload.
+ */
+static inline struct nlmsghdr *__nlmsg_put(struct sk_buff *skb, u32 pid,
+                                           u32 seq, int type, int payload,
+                                           int flags)
+{
+        struct nlmsghdr *nlh;
+
+        nlh = (struct nlmsghdr *) skb_put(skb, nlmsg_total_size(payload));
+        nlh->nlmsg_type = type;
+        nlh->nlmsg_len = nlmsg_msg_size(payload);
+        nlh->nlmsg_flags = flags;
+        nlh->nlmsg_pid = pid;
+        nlh->nlmsg_seq = seq;
+
+        memset((unsigned char *) nlmsg_data(nlh) + payload, 0,
+               nlmsg_padlen(payload));
+
+        return nlh;
+}
+#endif
+
+/**
+ * nlmsg_put - Add a new netlink message to an skb
+ * @skb: socket buffer to store message in
+ * @pid: netlink process id
+ * @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 pid, u32 seq,
+                                         int type, int payload, int flags)
+{
+        if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload)))
+                return NULL;
+
+        return __nlmsg_put(skb, pid, 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).pid, cb->nlh->nlmsg_seq,
+                         type, payload, flags);
+}
+
+/**
+ * nlmsg_new - Allocate a new netlink message
+ * @size: maximum size of message
+ *
+ * Use NLMSG_GOODSIZE if size isn't know and you need a good default size.
+ */
+static inline struct sk_buff *nlmsg_new(int size)
+{
+        return alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+}
+
+/**
+ * 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.
+ *
+ * Returns the total data length of the skb.
+ */
+static inline int nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+        nlh->nlmsg_len = skb->tail - (unsigned char *) nlh;
+
+        return skb->len;
+}
+
+/**
+ * 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. Returns -1.
+ */
+static inline int nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+        skb_trim(skb, (unsigned char *) nlh - skb->data);
+
+        return -1;
+}
+
+/**
+ * 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
+ * @pid: own netlink pid to avoid sending to yourself
+ * @group: multicast group id
+ */
+static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb,
+                                  u32 pid, unsigned int group)
+{
+        int err;
+
+        NETLINK_CB(skb).dst_group = group;
+
+        err = netlink_broadcast(sk, skb, pid, group, GFP_KERNEL);
+        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
+ * @pid: netlink pid of the destination socket
+ */
+static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 pid)
+{
+        int err;
+
+        err = netlink_unicast(sk, skb, pid, 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)))
+
+/**************************************************************************
+ * 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_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 >= sizeof(*nla) &&
+               nla->nla_len >= sizeof(*nla) &&
+               nla->nla_len <= remaining;
+}
+
+/**
+ * nla_next - next netlink attribte 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)
+{
+        int totlen = NLA_ALIGN(nla->nla_len);
+
+        *remaining -= totlen;
+        return (struct nlattr *) ((char *) nla + totlen);
+}
+
+/**
+ * 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
+ *
+ * See nla_parse()
+ */
+static inline int nla_parse_nested(struct nlattr *tb[], int maxtype,
+                                   struct nlattr *nla,
+                                   struct nla_policy *policy)
+{
+        return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy);
+}
+/**
+ * nla_put_u8 - 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_u8(struct sk_buff *skb, int attrtype, u8 value)
+{
+        return nla_put(skb, attrtype, sizeof(u8), &value);
+}
+
+/**
+ * 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)
+{
+        return nla_put(skb, attrtype, sizeof(u16), &value);
+}
+
+/**
+ * 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)
+{
+        return nla_put(skb, attrtype, sizeof(u32), &value);
+}
+
+/**
+ * nla_put_64 - Add a u64 netlink attribute to a socket buffer
+ * @skb: socket buffer to add attribute to
+ * @attrtype: attribute type
+ * @value: numeric value
+ */
+static inline int nla_put_u64(struct sk_buff *skb, int attrtype, u64 value)
+{
+        return nla_put(skb, attrtype, sizeof(u64), &value);
+}
+
+/**
+ * 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 socket buffer
+ * @skb: socket buffer to add attribute to
+ * @attrtype: attribute type
+ * @jiffies: number of msecs in jiffies
+ */
+static inline int nla_put_msecs(struct sk_buff *skb, int attrtype,
+                                unsigned long jiffies)
+{
+        u64 tmp = jiffies_to_msecs(jiffies);
+        return nla_put(skb, attrtype, sizeof(u64), &tmp);
+}
+
+#define NLA_PUT(skb, attrtype, attrlen, data) \
+        do { \
+                if (nla_put(skb, attrtype, attrlen, data) < 0) \
+                        goto nla_put_failure; \
+        } while(0)
+
+#define NLA_PUT_TYPE(skb, type, attrtype, value) \
+        do { \
+                type __tmp = value; \
+                NLA_PUT(skb, attrtype, sizeof(type), &__tmp); \
+        } while(0)
+
+#define NLA_PUT_U8(skb, attrtype, value) \
+        NLA_PUT_TYPE(skb, u8, attrtype, value)
+
+#define NLA_PUT_U16(skb, attrtype, value) \
+        NLA_PUT_TYPE(skb, u16, attrtype, value)
+
+#define NLA_PUT_U32(skb, attrtype, value) \
+        NLA_PUT_TYPE(skb, u32, attrtype, value)
+
+#define NLA_PUT_U64(skb, attrtype, value) \
+        NLA_PUT_TYPE(skb, u64, attrtype, value)
+
+#define NLA_PUT_STRING(skb, attrtype, value) \
+        NLA_PUT(skb, attrtype, strlen(value) + 1, value)
+
+#define NLA_PUT_FLAG(skb, attrtype, value) \
+        NLA_PUT(skb, attrtype, 0, NULL)
+
+#define NLA_PUT_MSECS(skb, attrtype, jiffies) \
+        NLA_PUT_U64(skb, attrtype, jiffies_to_msecs(jiffies))
+
+/**
+ * nla_get_u32 - return payload of u32 attribute
+ * @nla: u32 netlink attribute
+ */
+static inline u32 nla_get_u32(struct nlattr *nla)
+{
+        return *(u32 *) nla_data(nla);
+}
+
+/**
+ * nla_get_u16 - return payload of u16 attribute
+ * @nla: u16 netlink attribute
+ */
+static inline u16 nla_get_u16(struct nlattr *nla)
+{
+        return *(u16 *) nla_data(nla);
+}
+
+/**
+ * nla_get_u8 - return payload of u8 attribute
+ * @nla: u8 netlink attribute
+ */
+static inline u8 nla_get_u8(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(struct nlattr *nla)
+{
+        u64 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(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(struct nlattr *nla)
+{
+        u64 msecs = nla_get_u64(nla);
+
+        return msecs_to_jiffies((unsigned long) msecs);
+}
+
+/**
+ * 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;
+
+        if (nla_put(skb, attrtype, 0, NULL) < 0)
+                return NULL;
+
+        return start;
+}
+
+/**
+ * nla_nest_end - Finalize nesting of attributes
+ * @skb: socket buffer the attribtues 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 - (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 -1.
+ */
+static inline int nla_nest_cancel(struct sk_buff *skb, struct nlattr *start)
+{
+        if (start)
+                skb_trim(skb, (unsigned char *) start - skb->data);
+
+        return -1;
+}
+
+/**
+ * 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)))
+
+#endif