sandbox: eth-raw: Add a function to ask the host about localhost
Instead of doing a simple string compare against "lo", look for the flag
that indicates a localhost interface.
Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/sandbox/cpu/eth-raw-os.c b/arch/sandbox/cpu/eth-raw-os.c
index 82bf666..12ddb34 100644
--- a/arch/sandbox/cpu/eth-raw-os.c
+++ b/arch/sandbox/cpu/eth-raw-os.c
@@ -1,9 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
/*
- * Copyright (c) 2015 National Instruments
- *
- * (C) Copyright 2015
- * Joe Hershberger <joe.hershberger@ni.com>
+ * Copyright (c) 2015-2018 National Instruments
+ * Copyright (c) 2015-2018 Joe Hershberger <joe.hershberger@ni.com>
*/
#include <asm/eth-raw-os.h>
@@ -25,6 +23,27 @@
#include <linux/if_ether.h>
#include <linux/if_packet.h>
+int sandbox_eth_raw_os_is_local(const char *ifname)
+{
+ int fd = socket(AF_INET, SOCK_DGRAM, 0);
+ struct ifreq ifr;
+ int ret = 0;
+
+ if (fd < 0)
+ return -errno;
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
+ ret = ioctl(fd, SIOCGIFFLAGS, &ifr);
+ if (ret < 0) {
+ ret = -errno;
+ goto out;
+ }
+ ret = !!(ifr.ifr_flags & IFF_LOOPBACK);
+out:
+ close(fd);
+ return ret;
+}
+
static int _raw_packet_start(struct eth_sandbox_raw_priv *priv,
unsigned char *ethmac)
{