| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <BA41E8A07B73A041948C2E3A4EF6239D062F17@av-digital-exch.avdigital.at>
Date: Tue, 19 Feb 2008 09:40:03 +0100
From: "Reither Robert" <Robert.Reither@...digital.at>
To: "David Stevens" <dlstevens@...ibm.com>
CC: <netdev@...r.kernel.org>
Subject: AW: Problem receiving multicast/promiscuous-mode with kernel.2.6.24
Visit AVD on prolight+sound in Frankfurt from 12.-15. March 2008 - Hall 8.0, Stand G16
________________________________________________________________________
Hi,
ok, i managed to shrink down my code to show the behaviour in small size ;-)
It shows the same effect as my app, sometimes i get all the packets after a mc_join, sometimes i get only the timeouts.
I find no predictive behaviour, i'm really desperate ...
Hope you can see the effect too .. Do u need an app sending the multicast VLAN packets ?
Robert
-----------------------------------------
#include <stdint.h>
#include <sys/select.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <errno.h>
#include <netdb.h>
//#include <linux/if.h>
#include <linux/sockios.h>
#include <sys/ioctl.h>
//#define JOIN_SINGLE_IF
#undef JOIN_SINGLE_IF
#define PORT 10500
/*
** Try to receive VLAN-tagged UDP multicast packets
** VLAN-ID:3, VLAN_PRI=6, Addr: 224.1.9.0, dstnport 10500
**
** Kernel used: 2.6.24
**
** HW: VIA Epia 5000, VIA Epia LT (VIA Rhine II and VIA VT6107)
**
** Additional network settings:
** vconfig add eth0 3
** vconfig set_egress_map eth0.3 6 6
** ifconfig eth0.3 10.0.0.1
** route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0.3
**
*/
#define MAX_PAYLOAD 1000
/*
* Network representation of the rtp header.
*/
struct rtp_header {
#ifdef WORDS_BIGENDIAN
uint16_t version:2;
uint16_t padbit:1;
uint16_t extbit:1;
uint16_t cc:4;
uint16_t markbit:1;
uint16_t paytype:7;
#else
uint16_t cc:4;
uint16_t extbit:1;
uint16_t padbit:1;
uint16_t version:2;
uint16_t paytype:7;
uint16_t markbit:1;
#endif
uint16_t seq_number;
uint32_t timestamp;
uint32_t ssrc;
/* In fact we rely on rtp_header being not larger than
* the minimum header length. So, there's no contributing
* sync source field here. */
};
struct rtp_packet {
struct rtp_header header;
unsigned char payload[MAX_PAYLOAD];
};
#ifdef WORDS_BIGENDIAN
#error Sorry this is not supported on bigendian targets.
#endif
#define BYTE0(x) ((x) & 0xff)
#define BYTE1(x) (((x) >> 8) & 0xff)
#define BYTE2(x) (((x) >> 16) & 0xff)
#define BYTE3(x) (((x) >> 24) & 0xff)
static char *my_inet_ntoa (char *buf, size_t n, struct in_addr in)
{
if (snprintf (buf, n, "%u.%u.%u.%u", BYTE0(in.s_addr), BYTE1(in.s_addr), BYTE2(in.s_addr), BYTE3(in.s_addr)) >= n) {
return NULL;
}
return buf;
}
static int set_non_blocking (int fd)
{
int flags;
if ((flags = fcntl (fd, F_GETFL)) < 0) {
perror ("fcntl getflags ()");
return -1;
}
if (fcntl (fd, F_SETFL, flags | O_NONBLOCK) < 0) {
perror ("fcntl setflags ()");
return -1;
}
return fd;
}
int main()
{
int fd;
fd_set read_fds;
struct timespec timeout;
while(1)
{
int i, ret;
if ((fd = subscribe_udp (PORT)) < 0) {
printf("Could not register UDP port.\n");
return 1;
}
if (join_multicast_group (fd, "224.1.9.0") < 0)
{
printf("Error joining multicast !\n");
return 1;
}
for(i=0;i<10;i++)
{
FD_ZERO (&read_fds);
FD_SET (fd, &read_fds);
timeout.tv_sec = 1;
timeout.tv_nsec = 0;
ret = pselect (fd+1, &read_fds, NULL, NULL, &timeout, NULL);
if (ret < 0) {
if (errno == EINTR) {
continue;
} else {
printf("select failed.\n");
return 1;
}
}
if (FD_ISSET(fd, &read_fds))
{
ssize_t len;
struct rtp_packet p;
struct sockaddr_in from;
socklen_t fromlen;
char from_ip[20];
len = recvfrom (fd, &p, sizeof (p), 0, (struct sockaddr*) &from, &fromlen);
my_inet_ntoa (from_ip, sizeof (from_ip), from.sin_addr);
printf("Received data packet from %s, length %u\n", from_ip, len);
}
else
{
printf("Got timeout receiving Multicast packets !\n");
}
} /* loop 10 */
if (leave_multicast_group(fd, "224.1.9.0") < 0)
{
printf("Error leaving multicast !\n");
return 1;
}
close(fd);
}
}
int subscribe_udp (int port)
{
int s;
s = create_listening_socket (port, 1);
return s;
}
int create_listening_socket (int listen_port, int udp)
{
struct sockaddr_in a;
int s;
int yes;
if ((s = socket (AF_INET, udp ? SOCK_DGRAM : SOCK_STREAM, 0)) < 0) {
perror ("socket");
return -1;
}
yes = 1;
if (setsockopt (s, SOL_SOCKET, SO_REUSEADDR,
(char *) &yes, sizeof (yes)) < 0) {
perror ("setsockopt reuseaddr");
close (s);
return -1;
}
memset (&a, 0, sizeof (a));
a.sin_port = htons (listen_port);
a.sin_family = AF_INET;
if (bind (s, (struct sockaddr *) &a, sizeof (a)) < 0) {
perror ("bind");
close (s);
return -1;
}
if (set_non_blocking (s) < 0) {
close (s);
return -1;
}
if (!udp) {
listen (s, 10);
}
return s;
}
int join_multicast_group (int fd, const char *mc_address)
{
struct ip_mreqn imr;
printf("In join_mc_group: %s\n",mc_address);
if (inet_pton(AF_INET, mc_address, &imr.imr_multiaddr) != 1) {
//old if (inet_aton (mc_address, &imr.imr_multiaddr) == 0) {
printf ( "join_mc:Bad IP address format: %s\n", mc_address);
return -1;
}
imr.imr_address.s_addr = INADDR_ANY;
#ifdef JOIN_SINGLE_IF
imr.imr_ifindex = if_nametoindex("eth0.3"); // 0;
// imr.imr_ifindex = if_nametoindex("eth0"); // Testing
if (imr.imr_ifindex == 0)
{
printf ("join_mc:Got no interface-number from name !\n");
return -1;
}
#else
imr.imr_ifindex = 0;
#endif
// Check if already member
if (setsockopt (fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &imr, sizeof (imr)) < 0)
{
if (errno == EADDRINUSE) // Address already joined for IP_ADD_MEMBERSHIP
printf("Already joined IP_ADD_MEMBERSHIP for %s.\n", mc_address);
else
{
perror ("getsockopt ip_add_membership");
return -1;
}
}
return 0;
}
int leave_multicast_group(int fd, const char *mc_address)
{
struct ip_mreqn imr;
printf("In leave_mc_group: %s\n",mc_address);
if (inet_pton(AF_INET, mc_address, &imr.imr_multiaddr) != 1) {
// if (inet_aton (mc_address, &imr.imr_multiaddr) == 0) {
printf ("leave_mc:Bad IP address format: %s\n", mc_address);
return -1;
}
imr.imr_address.s_addr = INADDR_ANY;
#ifdef JOIN_SINGLE_IF
imr.imr_ifindex = if_nametoindex("eth0.3"); // 0 VLAN_ID ist aber vernderbar !!!!!
// imr.imr_ifindex = if_nametoindex("eth0"); // 0
if (imr.imr_ifindex == 0)
{
printf ("leave_mc:Got no interface-namber from name !\n");
return -1;
}
#else
imr.imr_ifindex = 0;
#endif
if (setsockopt (fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &imr, sizeof (imr)) < 0) {
perror ("setsockopt ip_drop_membership");
return -1;
}
return 0;
}
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists