141 lines
3.4 KiB
C
141 lines
3.4 KiB
C
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/*
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* Copyright (c) 2015 National Instruments
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*
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* (C) Copyright 2015
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* Joe Hershberger <joe.hershberger@ni.com>
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <asm/eth-raw-os.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <linux/if_ether.h>
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#include <linux/if_packet.h>
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int sandbox_eth_raw_os_start(const char *ifname, unsigned char *ethmac,
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struct eth_sandbox_raw_priv *priv)
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{
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struct sockaddr_ll *device;
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struct packet_mreq mr;
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int ret;
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int flags;
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/* Prepare device struct */
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priv->device = malloc(sizeof(struct sockaddr_ll));
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if (priv->device == NULL)
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return -ENOMEM;
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device = priv->device;
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memset(device, 0, sizeof(struct sockaddr_ll));
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device->sll_ifindex = if_nametoindex(ifname);
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device->sll_family = AF_PACKET;
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memcpy(device->sll_addr, ethmac, 6);
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device->sll_halen = htons(6);
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/* Open socket */
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priv->sd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
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if (priv->sd < 0) {
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printf("Failed to open socket: %d %s\n", errno,
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strerror(errno));
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return -errno;
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}
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/* Bind to the specified interface */
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ret = setsockopt(priv->sd, SOL_SOCKET, SO_BINDTODEVICE, ifname,
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strlen(ifname) + 1);
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if (ret < 0) {
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printf("Failed to bind to '%s': %d %s\n", ifname, errno,
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strerror(errno));
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return -errno;
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}
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/* Make the socket non-blocking */
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flags = fcntl(priv->sd, F_GETFL, 0);
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fcntl(priv->sd, F_SETFL, flags | O_NONBLOCK);
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/* Enable promiscuous mode to receive responses meant for us */
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mr.mr_ifindex = device->sll_ifindex;
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mr.mr_type = PACKET_MR_PROMISC;
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ret = setsockopt(priv->sd, SOL_PACKET, PACKET_ADD_MEMBERSHIP,
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&mr, sizeof(mr));
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if (ret < 0) {
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struct ifreq ifr;
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printf("Failed to set promiscuous mode: %d %s\n"
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"Falling back to the old \"flags\" way...\n",
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errno, strerror(errno));
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strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
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if (ioctl(priv->sd, SIOCGIFFLAGS, &ifr) < 0) {
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printf("Failed to read flags: %d %s\n", errno,
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strerror(errno));
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return -errno;
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}
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ifr.ifr_flags |= IFF_PROMISC;
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if (ioctl(priv->sd, SIOCSIFFLAGS, &ifr) < 0) {
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printf("Failed to write flags: %d %s\n", errno,
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strerror(errno));
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return -errno;
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}
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}
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return 0;
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}
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int sandbox_eth_raw_os_send(void *packet, int length,
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const struct eth_sandbox_raw_priv *priv)
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{
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int retval;
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if (!priv->sd || !priv->device)
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return -EINVAL;
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retval = sendto(priv->sd, packet, length, 0,
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(struct sockaddr *)priv->device,
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sizeof(struct sockaddr_ll));
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if (retval < 0) {
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printf("Failed to send packet: %d %s\n", errno,
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strerror(errno));
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return -errno;
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}
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return retval;
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}
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int sandbox_eth_raw_os_recv(void *packet, int *length,
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const struct eth_sandbox_raw_priv *priv)
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{
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int retval;
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int saddr_size;
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if (!priv->sd || !priv->device)
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return -EINVAL;
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saddr_size = sizeof(struct sockaddr);
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retval = recvfrom(priv->sd, packet, 1536, 0,
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(struct sockaddr *)priv->device,
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(socklen_t *)&saddr_size);
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*length = 0;
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if (retval >= 0) {
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*length = retval;
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return 0;
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}
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/* The socket is non-blocking, so expect EAGAIN when there is no data */
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if (errno == EAGAIN)
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return 0;
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return -errno;
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}
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void sandbox_eth_raw_os_stop(struct eth_sandbox_raw_priv *priv)
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{
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free(priv->device);
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priv->device = NULL;
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close(priv->sd);
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priv->sd = -1;
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}
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