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/* -*- c++ -*- */
/*
* Copyright 2005,2007,2008 Free Software Foundation, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "ethernet.h"
#include "pktfilter.h"
#include <open_usrp2_socket.h>
#include <iostream>
#include <unistd.h>
#include <fcntl.h>
//#include <features.h>
#include <errno.h>
#include <string.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/ethernet.h>
#include <netinet/in.h>
#include <linux/types.h>
#include <netpacket/packet.h>
#include <linux/filter.h> // packet filter
namespace usrp2 {
static int
open_packet_socket (std::string ifname, int protocol)
{
#if 0
if (protocol == 0)
protocol = htons(ETH_P_ALL);
int fd = socket (PF_PACKET, SOCK_RAW, protocol);
#else
int fd = usrp2::open_usrp2_socket();
#endif
if (fd == -1){
fprintf (stderr, "%s: socket: %s\n", ifname.c_str(), strerror (errno));
return -1;
}
// get interface index
struct ifreq ifr;
memset (&ifr, 0, sizeof(ifr));
strncpy (ifr.ifr_name, ifname.c_str(), sizeof (ifr.ifr_name));
int res = ioctl (fd, SIOCGIFINDEX, &ifr);
if (res != 0){
::close (fd);
fprintf (stderr, "%s: SIOCGIFINDEX: %s\n", ifname.c_str(), strerror(errno));
return -1;
}
int ifindex = ifr.ifr_ifindex;
// bind to the specified interface
sockaddr_ll sa;
memset (&sa, 0, sizeof (sa));
sa.sll_family = AF_PACKET;
sa.sll_protocol = protocol;
sa.sll_ifindex = ifindex;
res = bind (fd, (struct sockaddr *)&sa, sizeof (sa));
if (res != 0){
::close (fd);
fprintf (stderr, "%s: bind: %s\n", ifname.c_str(), strerror(errno));
return -1;
}
return fd;
}
static void
extract_mac_addr (unsigned char *mac, const unsigned char *hwaddr)
{
int i;
for (i = 0; i < 6; i++)
mac[i] = 0xff;
i = 0;
for (int j = 0; j < 14; j++){
if (hwaddr[j] != 0xff){
mac[i++] = hwaddr[j];
if (i == 6)
return;
}
}
}
static bool
get_mac_addr (std::string ifname, int fd, unsigned char *mac)
{
struct ifreq ifr;
memset (&ifr, 0, sizeof(ifr));
strncpy (ifr.ifr_name, ifname.c_str(), sizeof (ifr.ifr_name));
int res = ioctl (fd, SIOCGIFHWADDR, &ifr);
if (res != 0){
fprintf (stderr, "%s: SIOCGIFHWADDR: %s\n", ifname.c_str(), strerror(errno));
return false;
}
else {
if (0){
for (unsigned i = 0; i < sizeof (ifr.ifr_hwaddr.sa_data); i++)
fprintf (stderr, "%02x", ifr.ifr_hwaddr.sa_data[i]);
fprintf (stderr, "\n");
}
}
extract_mac_addr (mac, (unsigned char *)ifr.ifr_hwaddr.sa_data);
return true;
}
ethernet::ethernet ()
{
d_fd = -1;
memset (d_mac, 0, sizeof (d_mac));
}
ethernet::~ethernet ()
{
close ();
}
bool
ethernet::open (std::string ifname, int protocol)
{
if (d_fd != -1){
fprintf (stderr, "ethernet: already open\n");
return false;
}
if ((d_fd = open_packet_socket (ifname, protocol)) == -1){
return false;
}
get_mac_addr (ifname, d_fd, d_mac);
return true;
}
bool
ethernet::close ()
{
if (d_fd >= 0){
::close (d_fd);
d_fd = -1;
}
return true;
}
int
ethernet::read_packet (void *buf, int buflen)
{
int len = recvfrom (d_fd, buf, buflen, 0, (sockaddr *) 0, 0);
return len;
}
int
ethernet::read_packet_dont_block (void *buf, int buflen)
{
int len = recvfrom (d_fd, buf, buflen, MSG_DONTWAIT, 0, 0);
if (len == -1 && errno == EAGAIN)
return 0;
return len;
}
int
ethernet::write_packet (const void *buf, int buflen)
{
int retval = send (d_fd, buf, buflen, 0);
if (retval < 0){
if (errno == EINTR)
return write_packet (buf, buflen);
perror ("ethernet:write_packet: send");
return -1;
}
return retval;
}
int
ethernet::write_packetv(const eth_iovec *iov, size_t iovlen)
{
struct msghdr mh;
memset(&mh, 0, sizeof(mh));
mh.msg_iov = const_cast<eth_iovec*>(iov);
mh.msg_iovlen = iovlen;
int retval = sendmsg(d_fd, &mh, 0);
if (retval < 0){
if (errno == EINTR)
return write_packetv(iov, iovlen);
perror("ethernet:write_packetv: send");
return -1;
}
return retval;
}
bool
ethernet::attach_pktfilter (pktfilter *pf)
{
struct sock_fprog filter;
filter.len = pf->d_len;
filter.filter = pf->d_inst;
int r = setsockopt (d_fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter, sizeof (filter));
if (r < 0){
perror ("ethernet:attach: SO_ATTACH_FILTER");
return false;
}
return true;
}
} // namespace usrp2
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