netlink — Netlink macros
#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) ; |
<linux/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
.