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

SVN-Revision: 15507

1 files changed, 308 insertions, 0 deletions

diff --git a/package/libnl-tiny/src/include/netlink/msg.h b/package/libnl-tiny/src/include/netlink/msg.h
new file mode 100644
index 0000000000..aedcb08296
--- /dev/null
+++ b/package/libnl-tiny/src/include/netlink/msg.h
@@ -0,0 +1,308 @@
+/*
+ * netlink/msg.c		Netlink Messages Interface
+ *
+ *	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) 2003-2006 Thomas Graf <tgraf@suug.ch>
+ */
+
+#ifndef NETLINK_MSG_H_
+#define NETLINK_MSG_H_
+
+#include <netlink/netlink.h>
+#include <netlink/object.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct nla_policy;
+
+#define NL_DONTPAD	0
+
+/**
+ * @ingroup msg
+ * @brief
+ * Will cause the netlink pid to be set to the pid assigned to
+ * the netlink handle (socket) just before sending the message off.
+ * @note Requires the use of nl_send_auto_complete()!
+ */
+#define NL_AUTO_PID	0
+
+/**
+ * @ingroup msg
+ * @brief
+ * May be used to refer to a sequence number which should be
+ * automatically set just before sending the message off.
+ * @note Requires the use of nl_send_auto_complete()!
+ */
+#define NL_AUTO_SEQ	0
+
+#define NL_MSG_CRED_PRESENT 1
+
+struct nl_msg
+{
+	int			nm_protocol;
+	int			nm_flags;
+	struct sockaddr_nl	nm_src;
+	struct sockaddr_nl	nm_dst;
+	struct ucred		nm_creds;
+	struct nlmsghdr *	nm_nlh;
+	size_t			nm_size;
+	int			nm_refcnt;
+};
+
+
+struct nl_msg;
+struct nl_tree;
+struct ucred;
+
+/* message parsing */
+extern int		  nlmsg_ok(const struct nlmsghdr *, int);
+extern struct nlmsghdr *  nlmsg_next(struct nlmsghdr *, int *);
+extern int		  nlmsg_parse(struct nlmsghdr *, int, struct nlattr **,
+				      int, struct nla_policy *);
+extern int		  nlmsg_validate(struct nlmsghdr *, int, int,
+					 struct nla_policy *);
+
+extern struct nl_msg *	  nlmsg_alloc(void);
+extern struct nl_msg *	  nlmsg_alloc_size(size_t);
+extern struct nl_msg *	  nlmsg_alloc_simple(int, int);
+extern void		  nlmsg_set_default_size(size_t);
+extern struct nl_msg *	  nlmsg_inherit(struct nlmsghdr *);
+extern struct nl_msg *	  nlmsg_convert(struct nlmsghdr *);
+extern void *		  nlmsg_reserve(struct nl_msg *, size_t, int);
+extern int		  nlmsg_append(struct nl_msg *, void *, size_t, int);
+
+extern struct nlmsghdr *  nlmsg_put(struct nl_msg *, uint32_t, uint32_t,
+				    int, int, int);
+extern void		  nlmsg_free(struct nl_msg *);
+
+extern int		  nl_msg_parse(struct nl_msg *,
+				       void (*cb)(struct nl_object *, void *),
+				       void *);
+
+extern void		nl_msg_dump(struct nl_msg *, FILE *);
+
+/**
+ * length of netlink message not including padding
+ * @arg payload		length of message payload
+ */
+static inline int nlmsg_msg_size(int payload)
+{
+	return NLMSG_HDRLEN + payload;
+}
+
+/**
+ * length of netlink message including padding
+ * @arg payload		length of message payload
+ */
+static inline int nlmsg_total_size(int payload)
+{
+	return NLMSG_ALIGN(nlmsg_msg_size(payload));
+}
+
+/**
+ * length of padding at the message's tail
+ * @arg payload		length of message payload
+ */
+static inline int nlmsg_padlen(int payload)
+{
+	return nlmsg_total_size(payload) - nlmsg_msg_size(payload);
+}
+
+/**
+ * head of message payload
+ * @arg nlh		netlink messsage header
+ */
+static inline void *nlmsg_data(const struct nlmsghdr *nlh)
+{
+	return (unsigned char *) nlh + NLMSG_HDRLEN;
+}
+
+static inline void *nlmsg_tail(const struct nlmsghdr *nlh)
+{
+	return (unsigned char *) nlh + NLMSG_ALIGN(nlh->nlmsg_len);
+}
+
+/**
+ * length of message payload
+ * @arg nlh		netlink message header
+ */
+static inline int nlmsg_len(const struct nlmsghdr *nlh)
+{
+	return nlh->nlmsg_len - NLMSG_HDRLEN;
+}
+
+/**
+ * head of attributes data
+ * @arg nlh		netlink message header
+ * @arg 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));
+}
+
+/**
+ * length of attributes data
+ * @arg nlh		netlink message header
+ * @arg hdrlen		length of family specific header
+ */
+static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen)
+{
+	return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen);
+}
+
+static inline int nlmsg_valid_hdr(const struct nlmsghdr *nlh, int hdrlen)
+{
+	if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
+		return 0;
+
+	return 1;
+}
+
+
+static inline void nlmsg_set_proto(struct nl_msg *msg, int protocol)
+{
+	msg->nm_protocol = protocol;
+}
+
+static inline int nlmsg_get_proto(struct nl_msg *msg)
+{
+	return msg->nm_protocol;
+}
+
+static inline size_t nlmsg_get_max_size(struct nl_msg *msg)
+{
+	return msg->nm_size;
+}
+
+static inline void nlmsg_set_src(struct nl_msg *msg, struct sockaddr_nl *addr)
+{
+	memcpy(&msg->nm_src, addr, sizeof(*addr));
+}
+
+static inline struct sockaddr_nl *nlmsg_get_src(struct nl_msg *msg)
+{
+	return &msg->nm_src;
+}
+
+static inline void nlmsg_set_dst(struct nl_msg *msg, struct sockaddr_nl *addr)
+{
+	memcpy(&msg->nm_dst, addr, sizeof(*addr));
+}
+
+static inline struct sockaddr_nl *nlmsg_get_dst(struct nl_msg *msg)
+{
+	return &msg->nm_dst;
+}
+
+static inline void nlmsg_set_creds(struct nl_msg *msg, struct ucred *creds)
+{
+	memcpy(&msg->nm_creds, creds, sizeof(*creds));
+	msg->nm_flags |= NL_MSG_CRED_PRESENT;
+}
+
+static inline struct ucred *nlmsg_get_creds(struct nl_msg *msg)
+{
+	if (msg->nm_flags & NL_MSG_CRED_PRESENT)
+		return &msg->nm_creds;
+	return NULL;
+}
+
+/**
+ * Return actual netlink message
+ * @arg n		netlink message
+ * 
+ * Returns the actual netlink message casted to the type of the netlink
+ * message header.
+ * 
+ * @return A pointer to the netlink message.
+ */
+static inline struct nlmsghdr *nlmsg_hdr(struct nl_msg *n)
+{
+	return n->nm_nlh;
+}
+
+/**
+ * Acquire a reference on a netlink message
+ * @arg msg		message to acquire reference from
+ */
+static inline void nlmsg_get(struct nl_msg *msg)
+{
+	msg->nm_refcnt++;
+}
+
+/**
+ * Expand maximum payload size of a netlink message
+ * @arg n		Netlink message.
+ * @arg newlen		New maximum payload size.
+ *
+ * Reallocates the payload section of a netlink message and increases
+ * the maximum payload size of the message.
+ *
+ * @note Any pointers pointing to old payload block will be stale and
+ *       need to be refetched. Therfore, do not expand while constructing
+ *       nested attributes or while reserved data blocks are held.
+ *
+ * @return 0 on success or a negative error code.
+ */
+static inline int nlmsg_expand(struct nl_msg *n, size_t newlen)
+{
+	void *tmp;
+
+	if (newlen <= n->nm_size)
+		return -NLE_INVAL;
+
+	tmp = realloc(n->nm_nlh, newlen);
+	if (tmp == NULL)
+		return -NLE_NOMEM;
+
+	n->nm_nlh = tmp;
+	n->nm_size = newlen;
+
+	return 0;
+}
+
+
+/**
+ * @name Iterators
+ * @{
+ */
+
+/**
+ * @ingroup msg
+ * Iterate over a stream of attributes in a message
+ * @arg pos	loop counter, set to current attribute
+ * @arg nlh	netlink message header
+ * @arg hdrlen	length of family header
+ * @arg 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)
+
+/**
+ * Iterate over a stream of messages
+ * @arg pos	loop counter, set to current message
+ * @arg head	head of message stream
+ * @arg len	length of message stream
+ * @arg 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)))
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif