add libnl-tiny as a small replacement for libnl with only genl support included

SVN-Revision: 15507

1 files changed, 726 insertions, 0 deletions

diff --git a/package/libnl-tiny/src/include/netlink/attr.h b/package/libnl-tiny/src/include/netlink/attr.h
new file mode 100644
index 0000000000..7076d67e22
--- /dev/null
+++ b/package/libnl-tiny/src/include/netlink/attr.h
@@ -0,0 +1,726 @@
+/*
+ * netlink/attr.h		Netlink Attributes
+ *
+ *	This library is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU Lesser General Public
+ *	License as published by the Free Software Foundation version 2.1
+ *	of the License.
+ *
+ * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
+ */
+
+#ifndef NETLINK_ATTR_H_
+#define NETLINK_ATTR_H_
+
+#include <netlink/netlink.h>
+#include <netlink/object.h>
+#include <netlink/addr.h>
+#include <netlink/data.h>
+#include <netlink/msg.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct nl_msg;
+
+/**
+ * @name Basic Attribute Data Types
+ * @{
+ */
+
+ /**
+  * @ingroup attr
+  * Basic attribute data types
+  *
+  * See \ref attr_datatypes for more details.
+  */
+enum {
+	NLA_UNSPEC,	/**< Unspecified type, binary data chunk */
+	NLA_U8,		/**< 8 bit integer */
+	NLA_U16,	/**< 16 bit integer */
+	NLA_U32,	/**< 32 bit integer */
+	NLA_U64,	/**< 64 bit integer */
+	NLA_STRING,	/**< NUL terminated character string */
+	NLA_FLAG,	/**< Flag */
+	NLA_MSECS,	/**< Micro seconds (64bit) */
+	NLA_NESTED,	/**< Nested attributes */
+	__NLA_TYPE_MAX,
+};
+
+#define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1)
+
+/** @} */
+
+/**
+ * @ingroup attr
+ * Attribute validation policy.
+ *
+ * See \ref attr_datatypes for more details.
+ */
+struct nla_policy {
+	/** Type of attribute or NLA_UNSPEC */
+	uint16_t	type;
+
+	/** Minimal length of payload required */
+	uint16_t	minlen;
+
+	/** Maximal length of payload allowed */
+	uint16_t	maxlen;
+};
+
+/* Attribute parsing */
+extern int		nla_ok(const struct nlattr *, int);
+extern struct nlattr *	nla_next(const struct nlattr *, int *);
+extern int		nla_parse(struct nlattr **, int, struct nlattr *,
+				  int, struct nla_policy *);
+extern int		nla_validate(struct nlattr *, int, int,
+				     struct nla_policy *);
+extern struct nlattr *	nla_find(struct nlattr *, int, int);
+
+/* Unspecific attribute */
+extern struct nlattr *	nla_reserve(struct nl_msg *, int, int);
+extern int		nla_put(struct nl_msg *, int, int, const void *);
+
+/**
+ * nlmsg_find_attr - find a specific attribute in a netlink message
+ * @arg nlh		netlink message header
+ * @arg hdrlen		length of familiy specific header
+ * @arg 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);
+}
+
+
+/**
+ * Return size of attribute whithout padding.
+ * @arg payload		Payload length of attribute.
+ *
+ * @code
+ *    <-------- nla_attr_size(payload) --------->
+ *   +------------------+- - -+- - - - - - - - - +- - -+
+ *   | Attribute Header | Pad |     Payload      | Pad |
+ *   +------------------+- - -+- - - - - - - - - +- - -+
+ * @endcode
+ *
+ * @return Size of attribute in bytes without padding.
+ */
+static inline int nla_attr_size(int payload)
+{
+	return NLA_HDRLEN + payload;
+}
+
+/**
+ * Return size of attribute including padding.
+ * @arg payload		Payload length of attribute.
+ *
+ * @code
+ *    <----------- nla_total_size(payload) ----------->
+ *   +------------------+- - -+- - - - - - - - - +- - -+
+ *   | Attribute Header | Pad |     Payload      | Pad |
+ *   +------------------+- - -+- - - - - - - - - +- - -+
+ * @endcode
+ *
+ * @return Size of attribute in bytes.
+ */
+static inline int nla_total_size(int payload)
+{
+	return NLA_ALIGN(nla_attr_size(payload));
+}
+
+/**
+ * Return length of padding at the tail of the attribute.
+ * @arg payload		Payload length of attribute.
+ *
+ * @code
+ *   +------------------+- - -+- - - - - - - - - +- - -+
+ *   | Attribute Header | Pad |     Payload      | Pad |
+ *   +------------------+- - -+- - - - - - - - - +- - -+
+ *                                                <--->  
+ * @endcode
+ *
+ * @return Length of padding in bytes.
+ */
+static inline int nla_padlen(int payload)
+{
+	return nla_total_size(payload) - nla_attr_size(payload);
+}
+
+/**
+ * Return type of the attribute.
+ * @arg nla		Attribute.
+ *
+ * @return Type of attribute.
+ */
+static inline int nla_type(const struct nlattr *nla)
+{
+	return nla->nla_type & NLA_TYPE_MASK;
+}
+
+/**
+ * Return pointer to the payload section.
+ * @arg nla		Attribute.
+ *
+ * @return Pointer to start of payload section.
+ */
+static inline void *nla_data(const struct nlattr *nla)
+{
+	return (char *) nla + NLA_HDRLEN;
+}
+
+/**
+ * Return length of the payload .
+ * @arg nla		Attribute
+ *
+ * @return Length of payload in bytes.
+ */
+static inline int nla_len(const struct nlattr *nla)
+{
+	return nla->nla_len - NLA_HDRLEN;
+}
+
+/**
+ * Copy attribute payload to another memory area.
+ * @arg dest		Pointer to destination memory area.
+ * @arg src		Attribute
+ * @arg count		Number of bytes to copy at most.
+ *
+ * Note: The number of bytes copied is limited by the length of
+ *       the attribute payload.
+ *
+ * @return The number of bytes copied to dest.
+ */
+static inline int nla_memcpy(void *dest, struct nlattr *src, int count)
+{
+	int minlen;
+
+	if (!src)
+		return 0;
+	
+	minlen = min_t(int, count, nla_len(src));
+	memcpy(dest, nla_data(src), minlen);
+
+	return minlen;
+}
+
+
+/**
+ * Add abstract data as unspecific attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg data		Abstract data object.
+ *
+ * Equivalent to nla_put() except that the length of the payload is
+ * derived from the abstract data object.
+ *
+ * @see nla_put
+ * @return 0 on success or a negative error code.
+ */
+static inline int nla_put_data(struct nl_msg *msg, int attrtype, struct nl_data *data)
+{
+	return nla_put(msg, attrtype, nl_data_get_size(data),
+		       nl_data_get(data));
+}
+
+/**
+ * Add abstract address as unspecific attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg addr		Abstract address object.
+ *
+ * @see nla_put
+ * @return 0 on success or a negative error code.
+ */
+static inline int nla_put_addr(struct nl_msg *msg, int attrtype, struct nl_addr *addr)
+{
+	return nla_put(msg, attrtype, nl_addr_get_len(addr),
+		       nl_addr_get_binary_addr(addr));
+}
+
+/** @} */
+
+/**
+ * @name Integer Attributes
+ */
+
+/**
+ * Add 8 bit integer attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg value		Numeric value to store as payload.
+ *
+ * @see nla_put
+ * @return 0 on success or a negative error code.
+ */
+static inline int nla_put_u8(struct nl_msg *msg, int attrtype, uint8_t value)
+{
+	return nla_put(msg, attrtype, sizeof(uint8_t), &value);
+}
+
+/**
+ * Return value of 8 bit integer attribute.
+ * @arg nla		8 bit integer attribute
+ *
+ * @return Payload as 8 bit integer.
+ */
+static inline uint8_t nla_get_u8(struct nlattr *nla)
+{
+	return *(uint8_t *) nla_data(nla);
+}
+
+/**
+ * Add 16 bit integer attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg value		Numeric value to store as payload.
+ *
+ * @see nla_put
+ * @return 0 on success or a negative error code.
+ */
+static inline int nla_put_u16(struct nl_msg *msg, int attrtype, uint16_t value)
+{
+	return nla_put(msg, attrtype, sizeof(uint16_t), &value);
+}
+
+/**
+ * Return payload of 16 bit integer attribute.
+ * @arg nla		16 bit integer attribute
+ *
+ * @return Payload as 16 bit integer.
+ */
+static inline uint16_t nla_get_u16(struct nlattr *nla)
+{
+	return *(uint16_t *) nla_data(nla);
+}
+
+/**
+ * Add 32 bit integer attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg value		Numeric value to store as payload.
+ *
+ * @see nla_put
+ * @return 0 on success or a negative error code.
+ */
+static inline int nla_put_u32(struct nl_msg *msg, int attrtype, uint32_t value)
+{
+	return nla_put(msg, attrtype, sizeof(uint32_t), &value);
+}
+
+/**
+ * Return payload of 32 bit integer attribute.
+ * @arg nla		32 bit integer attribute.
+ *
+ * @return Payload as 32 bit integer.
+ */
+static inline uint32_t nla_get_u32(struct nlattr *nla)
+{
+	return *(uint32_t *) nla_data(nla);
+}
+
+/**
+ * Add 64 bit integer attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg value		Numeric value to store as payload.
+ *
+ * @see nla_put
+ * @return 0 on success or a negative error code.
+ */
+static inline int nla_put_u64(struct nl_msg *msg, int attrtype, uint64_t value)
+{
+	return nla_put(msg, attrtype, sizeof(uint64_t), &value);
+}
+
+/**
+ * Return payload of u64 attribute
+ * @arg nla		u64 netlink attribute
+ *
+ * @return Payload as 64 bit integer.
+ */
+static inline uint64_t nla_get_u64(struct nlattr *nla)
+{
+	uint64_t tmp;
+
+	nla_memcpy(&tmp, nla, sizeof(tmp));
+
+	return tmp;
+}
+
+/**
+ * Add string attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg str		NUL terminated string.
+ *
+ * @see nla_put
+ * @return 0 on success or a negative error code.
+ */
+static inline int nla_put_string(struct nl_msg *msg, int attrtype, const char *str)
+{
+	return nla_put(msg, attrtype, strlen(str) + 1, str);
+}
+
+/**
+ * Return payload of string attribute.
+ * @arg nla		String attribute.
+ *
+ * @return Pointer to attribute payload.
+ */
+static inline char *nla_get_string(struct nlattr *nla)
+{
+	return (char *) nla_data(nla);
+}
+
+static inline char *nla_strdup(struct nlattr *nla)
+{
+	return strdup(nla_get_string(nla));
+}
+
+/** @} */
+
+/**
+ * @name Flag Attribute
+ */
+
+/**
+ * Add flag netlink attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ *
+ * @see nla_put
+ * @return 0 on success or a negative error code.
+ */
+static inline int nla_put_flag(struct nl_msg *msg, int attrtype)
+{
+	return nla_put(msg, attrtype, 0, NULL);
+}
+
+/**
+ * Return true if flag attribute is set.
+ * @arg nla		Flag netlink attribute.
+ *
+ * @return True if flag is set, otherwise false.
+ */
+static inline int nla_get_flag(struct nlattr *nla)
+{
+	return !!nla;
+}
+
+/** @} */
+
+/**
+ * @name Microseconds Attribute
+ */
+
+/**
+ * Add a msecs netlink attribute to a netlink message
+ * @arg n		netlink message
+ * @arg attrtype	attribute type
+ * @arg msecs 		number of msecs
+ */
+static inline int nla_put_msecs(struct nl_msg *n, int attrtype, unsigned long msecs)
+{
+	return nla_put_u64(n, attrtype, msecs);
+}
+
+/**
+ * Return payload of msecs attribute
+ * @arg nla		msecs netlink attribute
+ *
+ * @return the number of milliseconds.
+ */
+static inline unsigned long nla_get_msecs(struct nlattr *nla)
+{
+	return nla_get_u64(nla);
+}
+
+/**
+ * Add nested attributes to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg nested		Message containing attributes to be nested.
+ *
+ * Takes the attributes found in the \a nested message and appends them
+ * to the message \a msg nested in a container of the type \a attrtype.
+ * The \a nested message may not have a family specific header.
+ *
+ * @see nla_put
+ * @return 0 on success or a negative error code.
+ */
+static inline int nla_put_nested(struct nl_msg *msg, int attrtype, struct nl_msg *nested)
+{
+	return nla_put(msg, attrtype, nlmsg_len(nested->nm_nlh),
+		       nlmsg_data(nested->nm_nlh));
+}
+
+/**
+ * Start a new level of nested attributes.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type of container.
+ *
+ * @return Pointer to container attribute.
+ */
+static inline struct nlattr *nla_nest_start(struct nl_msg *msg, int attrtype)
+{
+	struct nlattr *start = (struct nlattr *) nlmsg_tail(msg->nm_nlh);
+
+	if (nla_put(msg, attrtype, 0, NULL) < 0)
+		return NULL;
+
+	return start;
+}
+
+/**
+ * Finalize nesting of attributes.
+ * @arg msg		Netlink message.
+ * @arg start		Container attribute as returned from nla_nest_start().
+ *
+ * Corrects the container attribute header to include the appeneded attributes.
+ *
+ * @return 0
+ */
+static inline int nla_nest_end(struct nl_msg *msg, struct nlattr *start)
+{
+	start->nla_len = (unsigned char *) nlmsg_tail(msg->nm_nlh) -
+				(unsigned char *) start;
+	return 0;
+}
+
+/**
+ * Create attribute index based on nested attribute
+ * @arg tb		Index array to be filled (maxtype+1 elements).
+ * @arg maxtype		Maximum attribute type expected and accepted.
+ * @arg nla		Nested Attribute.
+ * @arg policy		Attribute validation policy.
+ *
+ * Feeds the stream of attributes nested into the specified attribute
+ * to nla_parse().
+ *
+ * @see nla_parse
+ * @return 0 on success or a negative error code.
+ */
+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);
+}
+
+/**
+ * Compare attribute payload with memory area.
+ * @arg nla		Attribute.
+ * @arg data		Memory area to compare to.
+ * @arg size		Number of bytes to compare.
+ *
+ * @see memcmp(3)
+ * @return An integer less than, equal to, or greater than zero.
+ */
+static inline int nla_memcmp(const struct nlattr *nla, const void *data, size_t size)
+{
+	int d = nla_len(nla) - size;
+
+	if (d == 0)
+		d = memcmp(nla_data(nla), data, size);
+
+	return d;
+}
+
+/**
+ * Compare string attribute payload with string
+ * @arg nla		Attribute of type NLA_STRING.
+ * @arg str		NUL terminated string.
+ *
+ * @see strcmp(3)
+ * @return An integer less than, equal to, or greater than zero.
+ */
+static inline int nla_strcmp(const struct nlattr *nla, const char *str)
+{
+	int len = strlen(str) + 1;
+	int d = nla_len(nla) - len;
+
+	if (d == 0)
+		d = memcmp(nla_data(nla), str, len);
+
+	return d;
+}
+
+/**
+ * Copy string attribute payload to a buffer.
+ * @arg dst		Pointer to destination buffer.
+ * @arg nla		Attribute of type NLA_STRING.
+ * @arg dstsize		Size of destination buffer in bytes.
+ *
+ * Copies at most dstsize - 1 bytes to the destination buffer.
+ * The result is always a valid NUL terminated string. Unlike
+ * strlcpy the destination buffer is always padded out.
+ *
+ * @return The length of string attribute without the terminating NUL.
+ */
+static inline size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize)
+{
+	size_t srclen = nla_len(nla);
+	char *src = nla_data(nla);
+
+	if (srclen > 0 && src[srclen - 1] == '\0')
+		srclen--;
+
+	if (dstsize > 0) {
+		size_t len = (srclen >= dstsize) ? dstsize - 1 : srclen;
+
+		memset(dst, 0, dstsize);
+		memcpy(dst, src, len);
+	}
+
+	return srclen;
+}
+
+
+/**
+ * @name Attribute Construction (Exception Based)
+ * @{
+ */
+
+/**
+ * @ingroup attr
+ * Add unspecific attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg attrlen		Length of attribute payload.
+ * @arg data		Head of attribute payload.
+ */
+#define NLA_PUT(msg, attrtype, attrlen, data) \
+	do { \
+		if (nla_put(msg, attrtype, attrlen, data) < 0) \
+			goto nla_put_failure; \
+	} while(0)
+
+/**
+ * @ingroup attr
+ * Add atomic type attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg type		Atomic type.
+ * @arg attrtype	Attribute type.
+ * @arg value		Head of attribute payload.
+ */
+#define NLA_PUT_TYPE(msg, type, attrtype, value) \
+	do { \
+		type __tmp = value; \
+		NLA_PUT(msg, attrtype, sizeof(type), &__tmp); \
+	} while(0)
+
+/**
+ * Add 8 bit integer attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg value		Numeric value.
+ */
+#define NLA_PUT_U8(msg, attrtype, value) \
+	NLA_PUT_TYPE(msg, uint8_t, attrtype, value)
+
+/**
+ * Add 16 bit integer attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg value		Numeric value.
+ */
+#define NLA_PUT_U16(msg, attrtype, value) \
+	NLA_PUT_TYPE(msg, uint16_t, attrtype, value)
+
+/**
+ * Add 32 bit integer attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg value		Numeric value.
+ */
+#define NLA_PUT_U32(msg, attrtype, value) \
+	NLA_PUT_TYPE(msg, uint32_t, attrtype, value)
+
+/**
+ * Add 64 bit integer attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg value		Numeric value.
+ */
+#define NLA_PUT_U64(msg, attrtype, value) \
+	NLA_PUT_TYPE(msg, uint64_t, attrtype, value)
+
+/**
+ * Add string attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg value		NUL terminated character string.
+ */
+#define NLA_PUT_STRING(msg, attrtype, value) \
+	NLA_PUT(msg, attrtype, strlen(value) + 1, value)
+
+/**
+ * Add flag attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ */
+#define NLA_PUT_FLAG(msg, attrtype) \
+	NLA_PUT(msg, attrtype, 0, NULL)
+
+/**
+ * Add msecs attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg msecs		Numeric value in micro seconds.
+ */
+#define NLA_PUT_MSECS(msg, attrtype, msecs) \
+	NLA_PUT_U64(msg, attrtype, msecs)
+
+/**
+ * Add address attribute to netlink message.
+ * @arg msg		Netlink message.
+ * @arg attrtype	Attribute type.
+ * @arg addr		Abstract address object.
+ */
+#define NLA_PUT_ADDR(msg, attrtype, addr) \
+	NLA_PUT(msg, attrtype, nl_addr_get_len(addr), \
+		nl_addr_get_binary_addr(addr))
+
+/** @} */
+
+/**
+ * @name Iterators
+ * @{
+ */
+
+/**
+ * @ingroup attr
+ * Iterate over a stream of attributes
+ * @arg pos	loop counter, set to current attribute
+ * @arg head	head of attribute stream
+ * @arg len	length of attribute stream
+ * @arg 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)))
+
+/**
+ * @ingroup attr
+ * Iterate over a stream of nested attributes
+ * @arg pos	loop counter, set to current attribute
+ * @arg nla	attribute containing the nested attributes
+ * @arg rem	initialized to len, holds bytes currently remaining in stream
+ */
+#define nla_for_each_nested(pos, nla, rem) \
+	for (pos = nla_data(nla), rem = nla_len(nla); \
+	     nla_ok(pos, rem); \
+	     pos = nla_next(pos, &(rem)))
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif