+++ /dev/null
-/*
- * 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 = (unsigned char*)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 < (uint)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 = (struct nlmsghdr*)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
projects / openwrt / openwrt.git / blobdiff