Bonding on 2.4.3, ifenslave wierdness
Daniel Pfenniger
daniel.pfenniger at obs.unige.ch
Sun Apr 29 23:10:56 PDT 2001
Aaron Van Couwenberghe wrote:
>
> On Fri, Apr 27, 2001 at 07:37:57AM +0200, daniel.pfenniger at obs.unige.ch wrote:
> > With 2.4 kernels ifenslave is no longer required. There is a bug
> > up to kernel 2.4.2 at bonding stop (typically at shutdown)
> > crashing the kernel.
> >
> > My configuration files are (RedHat 6.2, kernel 2.4.3, tulip cards):
>
> Thank you for the reply.
>
> How would one duplicate this configuration on a non-redhat box? Is ifenslave
> now replaced by command line options to ifconfig? If so, what version of
> ifconfig do I need?
>
> Are you sure you don't have ifenslave on your system? sysconfig could be
> calling it for you...
Sorry what I said is wrong. After verification (locate ifenslave)
I did keep ifenslave in /sbin from older kernels. ifenslave is
necessary for bonding properly.
In recent kernels the bonding.txt documentation has been removed
from the kernel Documentation/networking directory. Probably its
information was too inacurate and nobody found time the write an
up-to-date version.
I found two different (diff -b) versions of ifenslave.c circulating
on the Net with the same version number:
"ifenslave.c:v0.07 9/9/97 Donald Becker
(becker at cesdis.gsfc.nasa.gov)\n";
The version working with the 2.4.3 kernel is joined here as attachment,
as distinctive line it has among many others
#include <linux/if_bonding.h>
I hope this helps.
Dan
-------------- next part --------------
/* Mode: C;
* ifenslave.c: Configure network interfaces for parallel routing.
*
* This program controls the Linux implementation of running multiple
* network interfaces in parallel.
*
* Usage: ifenslave [-v] master-interface slave-interface [metric <N>]
*
* Author: Donald Becker <becker at cesdis.gsfc.nasa.gov>
* Copyright 1994-1996 Donald Becker
*
* 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.
*
* The author may be reached as becker at CESDIS.gsfc.nasa.gov, or C/O
* Center of Excellence in Space Data and Information Sciences
* Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
*/
static char *version =
"ifenslave.c:v0.07 9/9/97 Donald Becker (becker at cesdis.gsfc.nasa.gov)\n";
static const char *usage_msg =
"Usage: ifenslave [-afrvV] <master-interface> <slave-interface> [metric <N>]\n";
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <sys/types.h>
#include <asm/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/if_bonding.h>
struct option longopts[] = {
/* { name has_arg *flag val } */
{"all-interfaces", 0, 0, 'a'}, /* Show all interfaces. */
{"force", 0, 0, 'f'}, /* Force the operation. */
{"help", 0, 0, '?'}, /* Give help */
{"receive-slave", 0, 0, 'r'}, /* Make a receive-only slave. */
{"verbose", 0, 0, 'v'}, /* Report each action taken. */
{"version", 0, 0, 'V'}, /* Emit version information. */
{ 0, 0, 0, 0 }
};
/* Command-line flags. */
unsigned int
opt_a = 0, /* Show-all-interfaces flag. */
opt_f = 0, /* Force the operation. */
opt_r = 0, /* Set up a Rx-only slave. */
verbose = 0, /* Verbose flag. */
opt_version;
int skfd = -1; /* AF_INET socket for ioctl() calls. */
static void if_print(char *ifname);
int
main(int argc, char **argv)
{
struct ifreq ifr2, if_hwaddr, if_ipaddr, if_metric, if_mtu, if_dstaddr;
struct ifreq if_netmask, if_brdaddr, if_flags;
int goterr = 0;
int c, errflag = 0;
char **spp, *master_ifname, *slave_ifname;
while ((c = getopt_long(argc, argv, "afrvV?", longopts, 0)) != EOF)
switch (c) {
case 'a': opt_a++; break;
case 'f': opt_f++; break;
case 'r': opt_r++; break;
case 'v': verbose++; break;
case 'V': opt_version++; break;
case '?': errflag++;
}
if (errflag) {
fprintf(stderr, usage_msg);
return 2;
}
if (verbose || opt_version)
printf(version);
/* Open a basic socket. */
if ((skfd = socket(AF_INET, SOCK_DGRAM,0)) < 0) {
perror("socket");
exit(-1);
}
#ifdef notdef
/* Find options scattered throughout the command line.
I should change this to use getopt() sometime. */
argc--; argv++;
while (*argv[0] == '-') {
char *argp = *argv++;
argc--;
while (*++argp) {
switch (*argp) {
default:
fprintf(stderr, "Unrecognized option '%c'.\n%s",
argp[0], usage_msg);
return 2;
}
}
}
#endif
if (verbose)
fprintf(stderr, "DEBUG: argc=%d, optind=%d and argv[optind] is %s.\n",
argc, optind, argv[optind]);
/* No remaining args means show all interfaces. */
if (optind == argc) {
if_print((char *)NULL);
(void) close(skfd);
exit(0);
}
/* Copy the interface name. */
spp = argv + optind;
master_ifname = *spp++;
slave_ifname = *spp++;
/* A single args means show the configuration for this interface. */
if (slave_ifname == NULL) {
if_print(master_ifname);
(void) close(skfd);
exit(0);
}
/* Get the vitals from the master interface. */
strncpy(if_hwaddr.ifr_name, master_ifname, IFNAMSIZ);
if (ioctl(skfd, SIOCGIFHWADDR, &if_hwaddr) < 0) {
fprintf(stderr, "SIOCGIFHWADDR on %s failed: %s\n", master_ifname,
strerror(errno));
return 1;
} else { /* Gotta convert from 'char' to unsigned for printf(). */
unsigned char *hwaddr = (unsigned char *)if_hwaddr.ifr_hwaddr.sa_data;
/* The family '1' is ARPHRD_ETHER for ethernet. */
if (if_hwaddr.ifr_hwaddr.sa_family != 1 && !opt_f) {
fprintf(stderr, "The specified master interface '%s' is not"
" ethernet-like.\n This program is designed to work"
" with ethernet-like network interfaces.\n"
" Use the '-f' option to force the operation.\n",
master_ifname);
return 1;
}
{
int i, cnt=0;
for (i=0; i<6; i++) {
if (hwaddr[i] == 0)
cnt++;
}
if (cnt == 6) {
printf("master has no hw address assigned; getting one from slave!\n");
strncpy(ifr2.ifr_name, master_ifname, IFNAMSIZ);
strncpy(ifr2.ifr_slave, slave_ifname, IFNAMSIZ);
if (ioctl(skfd, BOND_SETHWADDR, &ifr2) < 0) {
fprintf(stderr,
"BOND_SETHWADDR on %s failed: %s\n", slave_ifname,
strerror(errno));
return 1;
}
strncpy(if_hwaddr.ifr_name, master_ifname, IFNAMSIZ);
if (ioctl(skfd, SIOCGIFHWADDR, &if_hwaddr) < 0) {
fprintf(stderr, "SIOCGIFHWADDR on %s failed: %s\n",
master_ifname, strerror(errno));
return 1;
}
}
}
if (verbose)
printf("The hardware address (SIOCGIFHWADDR) of %s is type %d "
"%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n", master_ifname,
if_hwaddr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1],
hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
}
{
struct ifreq *ifra[6] = { &if_ipaddr, &if_mtu, &if_dstaddr,
&if_brdaddr, &if_netmask, &if_flags };
const char *req_name[6] = {
"IP address", "MTU", "destination address",
"broadcast address", "netmask", "status flags", };
const int ioctl_req_type[6] = {
SIOCGIFADDR, SIOCGIFMTU, SIOCGIFDSTADDR,
SIOCGIFBRDADDR, SIOCGIFNETMASK, SIOCGIFFLAGS, };
int i;
for (i = 0; i < 6; i++) {
strncpy(ifra[i]->ifr_name, master_ifname, IFNAMSIZ);
if (ioctl(skfd, ioctl_req_type[i], ifra[i]) < 0) {
fprintf(stderr,
"Something broke getting the master's %s: %s.\n",
req_name[i], strerror(errno));
}
}
}
do {
strncpy(ifr2.ifr_name, slave_ifname, IFNAMSIZ);
if (ioctl(skfd, SIOCGIFFLAGS, &ifr2) < 0) {
int saved_errno = errno;
fprintf(stderr, "SIOCGIFFLAGS on %s failed: %s\n", slave_ifname,
strerror(saved_errno));
return 1;
}
if (ifr2.ifr_flags & IFF_UP) {
printf("The interface %s is up, shutting it down it to enslave it.\n",
slave_ifname);
ifr2.ifr_flags &= ~IFF_UP;
if (ioctl(skfd, SIOCSIFFLAGS, &ifr2) < 0) {
int saved_errno = errno;
fprintf(stderr, "Shutting down interface %s failed: %s\n",
slave_ifname, strerror(saved_errno));
}
}
strncpy(if_hwaddr.ifr_name, slave_ifname, IFNAMSIZ);
if (ioctl(skfd, SIOCSIFHWADDR, &if_hwaddr) < 0) {
int saved_errno = errno;
fprintf(stderr, "SIOCSIFHWADDR on %s failed: %s\n", if_hwaddr.ifr_name,
strerror(saved_errno));
if (saved_errno == EBUSY)
fprintf(stderr, " The slave device %s is busy: it must be"
" idle before running this command.\n", slave_ifname);
else if (saved_errno == EOPNOTSUPP)
fprintf(stderr, " The slave device you specified does not support"
" setting the MAC address.\n Your kernel likely does not"
" support slave devices.\n");
else if (saved_errno == EINVAL)
fprintf(stderr, " The slave device's address type does not match"
" the master's address type.\n");
return 1;
} else {
if (verbose) {
unsigned char *hwaddr = if_hwaddr.ifr_hwaddr.sa_data;
printf("Set the slave's hardware address to "
"%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n", hwaddr[0],
hwaddr[1], hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
}
}
if (*spp && !strcmp(*spp, "metric")) {
if (*++spp == NULL) {
fprintf(stderr, usage_msg);
exit(2);
}
if_metric.ifr_metric = atoi(*spp);
if (ioctl(skfd, SIOCSIFMETRIC, &if_metric) < 0) {
fprintf(stderr, "SIOCSIFMETRIC: %s\n", strerror(errno));
goterr = 1;
}
spp++;
}
if (strncpy(if_ipaddr.ifr_name, slave_ifname, IFNAMSIZ) <= 0
|| ioctl(skfd, SIOCSIFADDR, &if_ipaddr) < 0) {
fprintf(stderr,
"Something broke setting the slave's address: %s.\n",
strerror(errno));
} else {
if (verbose) {
unsigned char *ipaddr = if_ipaddr.ifr_addr.sa_data;
printf("Set the slave's IP address to %d.%d.%d.%d.\n",
ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
}
}
if (strncpy(if_mtu.ifr_name, slave_ifname, IFNAMSIZ) <= 0
|| ioctl(skfd, SIOCSIFMTU, &if_mtu) < 0) {
fprintf(stderr, "Something broke setting the slave MTU: %s.\n",
strerror(errno));
} else {
if (verbose)
printf("Set the slave's MTU to %d.\n", if_mtu.ifr_mtu);
}
if (strncpy(if_dstaddr.ifr_name, slave_ifname, IFNAMSIZ) <= 0
|| ioctl(skfd, SIOCSIFDSTADDR, &if_dstaddr) < 0) {
fprintf(stderr, "Error setting the slave with SIOCSIFDSTADDR: %s.\n",
strerror(errno));
} else {
if (verbose) {
unsigned char *ipaddr = if_dstaddr.ifr_dstaddr.sa_data;
printf("Set the slave's destination address to %d.%d.%d.%d.\n",
ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
}
}
if (strncpy(if_brdaddr.ifr_name, slave_ifname, IFNAMSIZ) <= 0
|| ioctl(skfd, SIOCSIFBRDADDR, &if_brdaddr) < 0) {
fprintf(stderr,
"Something broke setting the slave broadcast address: %s.\n",
strerror(errno));
} else {
if (verbose) {
unsigned char *ipaddr = if_brdaddr.ifr_broadaddr.sa_data;
printf("Set the slave's broadcast address to %d.%d.%d.%d.\n",
ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
}
}
if (strncpy(if_netmask.ifr_name, slave_ifname, IFNAMSIZ) <= 0
|| ioctl(skfd, SIOCSIFNETMASK, &if_netmask) < 0) {
fprintf(stderr,
"Something broke setting the slave netmask: %s.\n",
strerror(errno));
} else {
if (verbose) {
unsigned char *ipaddr = if_netmask.ifr_netmask.sa_data;
printf("Set the slave's netmask to %d.%d.%d.%d.\n",
ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
}
}
if ((if_flags.ifr_flags &= ~(IFF_SLAVE | IFF_MASTER)) == 0
|| strncpy(if_flags.ifr_name, slave_ifname, IFNAMSIZ) <= 0
|| ioctl(skfd, SIOCSIFFLAGS, &if_flags) < 0) {
fprintf(stderr,
"Something broke setting the slave flags: %s.\n",
strerror(errno));
} else {
if (verbose)
printf("Set the slave's flags %4.4x.\n", if_flags.ifr_flags);
}
/* Do the real thing: set the second interface as a slave. */
if ( ! opt_r) {
strncpy(if_flags.ifr_name, master_ifname, IFNAMSIZ);
strncpy(if_flags.ifr_slave, slave_ifname, IFNAMSIZ);
if (ioctl(skfd, BOND_ENSLAVE, &if_flags) < 0) {
fprintf(stderr, "SIOCSIFSLAVE: %d (%s).\n", errno, strerror(errno));
}
}
} while ( (slave_ifname = *spp++) != NULL);
/* Close the socket. */
(void) close(skfd);
return(goterr);
}
static short mif_flags;
/* Get the inteface configuration from the kernel. */
static int if_getconfig(char *ifname)
{
struct ifreq ifr;
int metric, mtu; /* Parameters of the master interface. */
struct sockaddr dstaddr, broadaddr, netmask;
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0)
return -1;
mif_flags = ifr.ifr_flags;
printf("The result of SIOCGIFFLAGS on %s is %x.\n",
ifname, ifr.ifr_flags);
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFADDR, &ifr) < 0)
return -1;
printf("The result of SIOCGIFADDR is %2.2x.%2.2x.%2.2x.%2.2x.\n",
ifr.ifr_addr.sa_data[0], ifr.ifr_addr.sa_data[1],
ifr.ifr_addr.sa_data[2], ifr.ifr_addr.sa_data[3]);
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
return -1;
{ /* Gotta convert from 'char' to unsigned for printf(). */
unsigned char *hwaddr = (unsigned char *)ifr.ifr_hwaddr.sa_data;
printf("The result of SIOCGIFHWADDR is type %d "
"%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
ifr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1],
hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
}
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFMETRIC, &ifr) < 0) {
metric = 0;
} else
metric = ifr.ifr_metric;
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFMTU, &ifr) < 0)
mtu = 0;
else
mtu = ifr.ifr_mtu;
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFDSTADDR, &ifr) < 0) {
memset(&dstaddr, 0, sizeof(struct sockaddr));
} else
dstaddr = ifr.ifr_dstaddr;
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFBRDADDR, &ifr) < 0) {
memset(&broadaddr, 0, sizeof(struct sockaddr));
} else
broadaddr = ifr.ifr_broadaddr;
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFNETMASK, &ifr) < 0) {
memset(&netmask, 0, sizeof(struct sockaddr));
} else
netmask = ifr.ifr_netmask;
return(0);
}
static void if_print(char *ifname)
{
char buff[1024];
struct ifconf ifc;
struct ifreq *ifr;
int i;
if (ifname == (char *)NULL) {
ifc.ifc_len = sizeof(buff);
ifc.ifc_buf = buff;
if (ioctl(skfd, SIOCGIFCONF, &ifc) < 0) {
fprintf(stderr, "SIOCGIFCONF: %s\n", strerror(errno));
return;
}
ifr = ifc.ifc_req;
for (i = ifc.ifc_len / sizeof(struct ifreq); --i >= 0; ifr++) {
if (if_getconfig(ifr->ifr_name) < 0) {
fprintf(stderr, "%s: unknown interface.\n",
ifr->ifr_name);
continue;
}
if (((mif_flags & IFF_UP) == 0) && !opt_a) continue;
/*ife_print(&ife);*/
}
} else {
if (if_getconfig(ifname) < 0)
fprintf(stderr, "%s: unknown interface.\n", ifname);
}
}
/*
* Local variables:
* version-control: t
* kept-new-versions: 5
* c-indent-level: 4
* c-basic-offset: 4
* tab-width: 4
* compile-command: "gcc -Wall -Wstrict-prototypes -O ifenslave.c -o ifenslave"
* End:
*/
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