From 55bc8fead207fcb2aafe414ce84073f147ebce39 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Mon, 10 Feb 2020 16:00:28 +0000
Subject:  Add bcnm-waitif

---
 src/libbcnm/bcnm_if_link_init.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 src/libbcnm/bcnm_if_link_init.c

(limited to 'src/libbcnm/bcnm_if_link_init.c')

diff --git a/src/libbcnm/bcnm_if_link_init.c b/src/libbcnm/bcnm_if_link_init.c
new file mode 100644
index 0000000..dad93fd
--- /dev/null
+++ b/src/libbcnm/bcnm_if_link_init.c
@@ -0,0 +1,38 @@
+/* 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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