summaryrefslogtreecommitdiffstats
path: root/arch/sandbox/cpu/eth-raw-os.c
diff options
context:
space:
mode:
authorJoe Hershberger <joe.hershberger@ni.com>2015-03-22 17:09:21 -0500
committerSimon Glass <sjg@chromium.org>2015-04-18 11:11:13 -0600
commita346ca7902a185a1974d50d60790d34715be886e (patch)
tree698a093dcaa6f13556c6b94352ed7d064b991bb2 /arch/sandbox/cpu/eth-raw-os.c
parent7ece1c61ade7f3b9ec25118d8adab5a8d47c3276 (diff)
downloadtalos-obmc-uboot-a346ca7902a185a1974d50d60790d34715be886e.tar.gz
talos-obmc-uboot-a346ca7902a185a1974d50d60790d34715be886e.zip
sandbox: eth: Add a bridge to a real network for sandbox
Implement a bridge between U-Boot's network stack and Linux's raw packet API allowing the sandbox to send and receive packets using the host machine's network interface. This raw Ethernet API requires elevated privileges. You can either run as root, or you can add the capability needed like so: sudo /sbin/setcap "CAP_NET_RAW+ep" /path/to/u-boot Signed-off-by: Joe Hershberger <joe.hershberger@ni.com> Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/sandbox/cpu/eth-raw-os.c')
-rw-r--r--arch/sandbox/cpu/eth-raw-os.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/arch/sandbox/cpu/eth-raw-os.c b/arch/sandbox/cpu/eth-raw-os.c
new file mode 100644
index 0000000000..601205a60b
--- /dev/null
+++ b/arch/sandbox/cpu/eth-raw-os.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (c) 2015 National Instruments
+ *
+ * (C) Copyright 2015
+ * Joe Hershberger <joe.hershberger@ni.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <asm/eth-raw-os.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <net/if.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include <linux/if_ether.h>
+#include <linux/if_packet.h>
+
+int sandbox_eth_raw_os_start(const char *ifname, unsigned char *ethmac,
+ struct eth_sandbox_raw_priv *priv)
+{
+ struct sockaddr_ll *device;
+ struct packet_mreq mr;
+ int ret;
+ int flags;
+
+ /* Prepare device struct */
+ priv->device = malloc(sizeof(struct sockaddr_ll));
+ if (priv->device == NULL)
+ return -ENOMEM;
+ device = priv->device;
+ memset(device, 0, sizeof(struct sockaddr_ll));
+ device->sll_ifindex = if_nametoindex(ifname);
+ device->sll_family = AF_PACKET;
+ memcpy(device->sll_addr, ethmac, 6);
+ device->sll_halen = htons(6);
+
+ /* Open socket */
+ priv->sd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
+ if (priv->sd < 0) {
+ printf("Failed to open socket: %d %s\n", errno,
+ strerror(errno));
+ return -errno;
+ }
+ /* Bind to the specified interface */
+ ret = setsockopt(priv->sd, SOL_SOCKET, SO_BINDTODEVICE, ifname,
+ strlen(ifname) + 1);
+ if (ret < 0) {
+ printf("Failed to bind to '%s': %d %s\n", ifname, errno,
+ strerror(errno));
+ return -errno;
+ }
+
+ /* Make the socket non-blocking */
+ flags = fcntl(priv->sd, F_GETFL, 0);
+ fcntl(priv->sd, F_SETFL, flags | O_NONBLOCK);
+
+ /* Enable promiscuous mode to receive responses meant for us */
+ mr.mr_ifindex = device->sll_ifindex;
+ mr.mr_type = PACKET_MR_PROMISC;
+ ret = setsockopt(priv->sd, SOL_PACKET, PACKET_ADD_MEMBERSHIP,
+ &mr, sizeof(mr));
+ if (ret < 0) {
+ struct ifreq ifr;
+
+ printf("Failed to set promiscuous mode: %d %s\n"
+ "Falling back to the old \"flags\" way...\n",
+ errno, strerror(errno));
+ strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
+ if (ioctl(priv->sd, SIOCGIFFLAGS, &ifr) < 0) {
+ printf("Failed to read flags: %d %s\n", errno,
+ strerror(errno));
+ return -errno;
+ }
+ ifr.ifr_flags |= IFF_PROMISC;
+ if (ioctl(priv->sd, SIOCSIFFLAGS, &ifr) < 0) {
+ printf("Failed to write flags: %d %s\n", errno,
+ strerror(errno));
+ return -errno;
+ }
+ }
+ return 0;
+}
+
+int sandbox_eth_raw_os_send(void *packet, int length,
+ const struct eth_sandbox_raw_priv *priv)
+{
+ int retval;
+
+ if (!priv->sd || !priv->device)
+ return -EINVAL;
+
+ retval = sendto(priv->sd, packet, length, 0,
+ (struct sockaddr *)priv->device,
+ sizeof(struct sockaddr_ll));
+ if (retval < 0) {
+ printf("Failed to send packet: %d %s\n", errno,
+ strerror(errno));
+ return -errno;
+ }
+ return retval;
+}
+
+int sandbox_eth_raw_os_recv(void *packet, int *length,
+ const struct eth_sandbox_raw_priv *priv)
+{
+ int retval;
+ int saddr_size;
+
+ if (!priv->sd || !priv->device)
+ return -EINVAL;
+ saddr_size = sizeof(struct sockaddr);
+ retval = recvfrom(priv->sd, packet, 1536, 0,
+ (struct sockaddr *)priv->device,
+ (socklen_t *)&saddr_size);
+ *length = 0;
+ if (retval >= 0) {
+ *length = retval;
+ return 0;
+ }
+ /* The socket is non-blocking, so expect EAGAIN when there is no data */
+ if (errno == EAGAIN)
+ return 0;
+ return -errno;
+}
+
+void sandbox_eth_raw_os_stop(struct eth_sandbox_raw_priv *priv)
+{
+ free(priv->device);
+ priv->device = NULL;
+ close(priv->sd);
+ priv->sd = -1;
+}
OpenPOWER on IntegriCloud