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/* ISC license. */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <bcnm/if.h>
int bcnm_if_link_init (unsigned int kbufsz)
{
struct sockaddr_nl nl =
{
.nl_family = AF_NETLINK,
.nl_pad = 0,
.nl_groups = RTNLGRP_LINK,
.nl_pid = 0
} ;
int fd = socket(AF_NETLINK, SOCK_DGRAM | SOCK_NONBLOCK | SOCK_CLOEXEC, NETLINK_ROUTE) ;
if (fd < 0) return -1 ;
if (bind(fd, (struct sockaddr *)&nl, sizeof(struct sockaddr_nl)) < 0) goto err ;
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &kbufsz, sizeof(unsigned int)) < 0)
{
if (errno != EPERM
|| setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &kbufsz, sizeof(unsigned int)) < 0) goto err ;
}
return fd ;
err:
close(fd) ;
return -1 ;
}
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