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/*
* 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;
}
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