netlink(3) -- Linux man page
NAME
netlink - Netlink macros
SYNOPSIS
#include <asm/types.h>
#include <linux/netlink.h>
int NLMSG_ALIGN(size_t len);
int NLMSG_LENGTH(size_t len);
int NLMSG_SPACE(size_t len);
void *NLMSG_DATA(struct nlmsghdr *nlh);
struct nlmsghdr *NLMSG_NEXT(struct nlmsghdr *nlh, int len);
int NLMSG_OK(struct nlmsghdr *nlh, int len);
int NLMSG_PAYLOAD(struct nlmsghdr *nlh, int len);
DESCRIPTION
netlink.h
defines several standard macros to access or create a netlink datagram.
They are similar in spirit to the macros defined in
cmsg(3)
for auxiliary data. The buffer passed to and from a netlink socket should
be only accessed using these macros.
- NLMSG_ALIGN
-
-
Round the length of a netlink message up to align it properly.
- NLMSG_LENGTH
-
Gets the payload length as argument and returns the aligned length to store
in the
nlmsg_len
field of the
nlmsghdr.
- NLMSG_SPACE
-
Return the number of bytes a netlink message with payload of the passed length
would occupy.
- NLMSG_DATA
-
Return a pointer to the payload associated with the passed
nlmsghdr.
-
-
NLMSG_NEXT
Get the next
nlmsghdr
in a multipart message. The caller must check if the current nlmsghdr
didn't have the NLMSG_DONE set - this function doesn't return NULL on end. The
length parameter is an lvalue containing the remaining length of the message
buffer. This macro decrements it by the length of the message header.
- NLMSG_OK
-
Return true if the netlink message is not truncated and ok to parse.
- NLMSG_PAYLOAD
-
Return the length of the payload associated with the
nlmsghdr.
NOTES
It is often better to use netlink via
libnetlink
than via the low level kernel interface.
SEE ALSO
netlink(7)
and ftp://ftp.inr.ac.ru/ip-routing/iproute2* for libnetlink
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