NetBSD-5.0.2/usr.sbin/pppd/pppd/sys-bsd.c
/* $NetBSD: sys-bsd.c,v 1.58.2.1 2009/04/03 17:59:03 snj Exp $ */
/*
* sys-bsd.c - System-dependent procedures for setting up
* PPP interfaces on bsd-4.4-ish systems (including 386BSD, NetBSD, etc.)
*
* Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Office of Technology Transfer
* Carnegie Mellon University
* 5000 Forbes Avenue
* Pittsburgh, PA 15213-3890
* (412) 268-4387, fax: (412) 268-7395
* tech-transfer@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Copyright (c) 1989-2002 Paul Mackerras. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name(s) of the authors of this software must not be used to
* endorse or promote products derived from this software without
* prior written permission.
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Paul Mackerras
* <paulus@samba.org>".
*
* THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
#define RCSID "Id: sys-bsd.c,v 1.47 2000/04/13 12:04:23 paulus Exp "
#else
__RCSID("$NetBSD: sys-bsd.c,v 1.58.2.1 2009/04/03 17:59:03 snj Exp $");
#endif
#endif
/*
* TODO:
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <termios.h>
#include <signal.h>
#include <vis.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/param.h>
#if defined(NetBSD1_2) || defined(__NetBSD_Version__)
#include <util.h>
#endif
#ifdef PPP_FILTER
#include <net/bpf.h>
#endif
#include <net/if.h>
#include <net/ppp_defs.h>
#include <net/if_ppp.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#ifdef __KAME__
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#endif
#include <ifaddrs.h>
#if RTM_VERSION >= 3
#include <sys/param.h>
#if defined(NetBSD) && (NetBSD >= 199703)
#include <netinet/if_inarp.h>
#else /* NetBSD 1.2D or later */
#ifdef __FreeBSD__
#include <netinet/if_ether.h>
#else
#include <net/if_ether.h>
#endif
#endif
#endif
#include "pppd.h"
#include "fsm.h"
#include "ipcp.h"
#ifdef RCSID
static const char rcsid[] = RCSID;
#endif
static int initdisc = -1; /* Initial TTY discipline for ppp_fd */
static int initfdflags = -1; /* Initial file descriptor flags for ppp_fd */
static int ppp_fd = -1; /* fd which is set to PPP discipline */
static int rtm_seq;
static int restore_term; /* 1 => we've munged the terminal */
static struct termios inittermios; /* Initial TTY termios */
static struct winsize wsinfo; /* Initial window size info */
static int loop_slave = -1;
static int loop_master = -1;
static char loop_name[20];
static unsigned char inbuf[512]; /* buffer for chars read from loopback */
static int sock_fd; /* socket for doing interface ioctls */
#ifdef INET6
static int sock6_fd = -1; /* socket for doing ipv6 interface ioctls */
#endif /* INET6 */
static int ttyfd = -1; /* the file descriptor of the tty */
static fd_set in_fds; /* set of fds that wait_input waits for */
static int max_in_fd; /* highest fd set in in_fds */
static int if_is_up; /* the interface is currently up */
static u_int32_t ifaddrs[2]; /* local and remote addresses we set */
static u_int32_t default_route_gateway; /* gateway addr for default route */
static u_int32_t proxy_arp_addr; /* remote addr for proxy arp */
/* Prototypes for procedures local to this file. */
static int get_flags(int);
static void set_flags(int, int);
static int dodefaultroute(u_int32_t, int);
static int get_ether_addr(u_int32_t, struct sockaddr_dl *);
static void restore_loop(void); /* Transfer ppp unit back to loopback */
/********************************************************************
*
* Functions to read and set the flags value in the device driver
*/
static int
get_flags(int fd)
{
int flags;
if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &flags) == -1)
fatal("ioctl(PPPIOCGFLAGS): %m");
SYSDEBUG((LOG_DEBUG, "get flags = %x\n", flags));
return flags;
}
/********************************************************************/
static void
set_flags(int fd, int flags)
{
SYSDEBUG((LOG_DEBUG, "set flags = %x\n", flags));
if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &flags) == -1)
fatal("ioctl(PPPIOCSFLAGS, %x): %m", flags, errno);
}
/*
* sys_init - System-dependent initialization.
*/
void
sys_init(void)
{
/* Get an internet socket for doing socket ioctl's on. */
if ((sock_fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
fatal("Couldn't create IP socket: %m");
#ifdef INET6
if ((sock6_fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
/* check it at runtime */
sock6_fd = -1;
}
#endif
FD_ZERO(&in_fds);
max_in_fd = 0;
}
/*
* sys_cleanup - restore any system state we modified before exiting:
* mark the interface down, delete default route and/or proxy arp entry.
* This should call die() because it's called from die().
*/
void
sys_cleanup(void)
{
struct ifreq ifr;
if (if_is_up) {
strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
if (ioctl(sock_fd, SIOCGIFFLAGS, &ifr) >= 0
&& ((ifr.ifr_flags & IFF_UP) != 0)) {
ifr.ifr_flags &= ~IFF_UP;
ioctl(sock_fd, SIOCSIFFLAGS, &ifr);
}
}
if (ifaddrs[0] != 0)
cifaddr(0, ifaddrs[0], ifaddrs[1]);
if (default_route_gateway)
cifdefaultroute(0, 0, default_route_gateway);
if (proxy_arp_addr)
cifproxyarp(0, proxy_arp_addr);
}
/*
* sys_close - Clean up in a child process before execing.
*/
void
sys_close()
{
if (sock_fd >= 0)
close(sock_fd);
#ifdef INET6
if (sock6_fd >= 0)
close(sock6_fd);
#endif
if (loop_slave >= 0)
close(loop_slave);
if (loop_master >= 0)
close(loop_master);
}
/*
* sys_check_options - check the options that the user specified
*/
int
sys_check_options(void)
{
#ifndef CDTRCTS
if (crtscts == 2) {
warn("DTR/CTS flow control is not supported on this system");
return 0;
}
#endif
return 1;
}
/*
* ppp_available - check whether the system has any ppp interfaces
* (in fact we check whether we can do an ioctl on ppp0).
*/
int
ppp_available(void)
{
struct if_clonereq ifcr;
char *cp, *buf;
int idx, s;
extern char *no_ppp_msg;
(void)memset(&ifcr, 0, sizeof(ifcr));
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
fatal("socket: %m");
if (ioctl(s, SIOCIFGCLONERS, &ifcr) == -1)
fatal("ioctl(get cloners): %m");
buf = malloc(ifcr.ifcr_total * IFNAMSIZ);
if (buf == NULL)
fatal("Unable to allocate cloner name buffer: %m");
ifcr.ifcr_count = ifcr.ifcr_total;
ifcr.ifcr_buffer = buf;
if (ioctl(s, SIOCIFGCLONERS, &ifcr) == -1)
fatal("ioctl(get cloners): %m");
(void)close(s);
/*
* In case some disappeared in the mean time, clamp it down.
*/
if (ifcr.ifcr_count > ifcr.ifcr_total)
ifcr.ifcr_count = ifcr.ifcr_total;
for (cp = buf, idx = 0; idx < ifcr.ifcr_count; idx++, cp += IFNAMSIZ) {
if (strcmp(cp, "ppp") == 0)
break;
}
free(buf);
#ifdef __NetBSD__
no_ppp_msg = "\
This system lacks kernel support for PPP. To include PPP support\n\
in the kernel, please read the ppp(4) manual page.\n";
#else
no_ppp_msg = "\
This system lacks kernel support for PPP. To include PPP support\n\
in the kernel, please follow the steps detailed in the README.bsd\n\
file in the ppp-2.2 distribution.\n";
#endif
return idx != ifcr.ifcr_count;
}
/*
* tty_establish_ppp - Turn the serial port into a ppp interface.
*/
int
tty_establish_ppp(int fd)
{
int pppdisc = PPPDISC;
int x;
ttyfd = fd;
if (demand) {
/*
* Demand mode - prime the old ppp device to relinquish the unit.
*/
if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0)
fatal("ioctl(transfer ppp unit): %m");
}
/*
* Save the old line discipline of fd, and set it to PPP.
*/
if (ioctl(fd, TIOCGETD, &initdisc) < 0)
fatal("ioctl(TIOCGETD): %m");
if (ioctl(fd, TIOCSETD, &pppdisc) < 0)
fatal("ioctl(TIOCSETD): %m");
if (ioctl(fd, PPPIOCGUNIT, &x) < 0)
fatal("ioctl(PPPIOCGUNIT): %m");
if (!demand) {
/*
* Find out which interface we were given.
*/
ifunit = x;
} else {
/*
* Check that we got the same unit again.
*/
if (x != ifunit)
fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
x = TTYDISC;
if (ioctl(loop_slave, TIOCSETD, &x) == -1)
fatal("ioctl(TIOCGETD): %m");
}
ppp_fd = fd;
/*
* Enable debug in the driver if requested.
*/
if (kdebugflag) {
x = get_flags(fd);
x |= (kdebugflag & 0xFF) * SC_DEBUG;
set_flags(fd, x);
}
/*
* Set device for non-blocking reads.
*/
if ((initfdflags = fcntl(fd, F_GETFL)) == -1
|| fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
warn("Couldn't set device to non-blocking mode: %m");
}
return fd;
}
/*
* restore_loop - reattach the ppp unit to the loopback.
*/
static void
restore_loop(void)
{
int x;
/*
* Transfer the ppp interface back to the loopback.
*/
if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0)
fatal("ioctl(transfer ppp unit): %m");
x = PPPDISC;
if (ioctl(loop_slave, TIOCSETD, &x) < 0)
fatal("ioctl(TIOCSETD): %m");
/*
* Check that we got the same unit again.
*/
if (ioctl(loop_slave, PPPIOCGUNIT, &x) < 0)
fatal("ioctl(PPPIOCGUNIT): %m");
if (x != ifunit)
fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
ppp_fd = loop_slave;
}
/*
* Determine if the PPP connection should still be present.
*/
extern int hungup;
/*
* tty_disestablish_ppp - Restore the serial port to normal operation.
* and reconnect the ppp unit to the loopback if in demand mode.
* This shouldn't call die() because it's called from die().
*/
void
tty_disestablish_ppp(fd)
int fd;
{
if (demand)
restore_loop();
if (!hungup || demand) {
/* Flush the tty output buffer so that the TIOCSETD doesn't hang. */
if (tcflush(fd, TCIOFLUSH) < 0)
warn("tcflush failed: %m");
/* Restore old line discipline. */
if (initdisc >= 0 && ioctl(fd, TIOCSETD, &initdisc) < 0)
error("ioctl(TIOCSETD): %m");
initdisc = -1;
/* Reset non-blocking mode on fd. */
if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
warn("Couldn't restore device fd flags: %m");
}
initfdflags = -1;
if (fd == ppp_fd)
ppp_fd = -1;
}
/*
* cfg_bundle - configure the existing bundle.
* Used in demand mode.
*/
void
cfg_bundle(int mrru, int mtru, int rssn, int tssn)
{
abort();
#ifdef notyet
int flags;
struct ifreq ifr;
if (!new_style_driver)
return;
/* set the mrru, mtu and flags */
if (ioctl(ppp_dev_fd, PPPIOCSMRRU, &mrru) < 0)
error("Couldn't set MRRU: %m");
flags = get_flags(ppp_dev_fd);
flags &= ~(SC_MP_SHORTSEQ | SC_MP_XSHORTSEQ);
flags |= (rssn? SC_MP_SHORTSEQ: 0) | (tssn? SC_MP_XSHORTSEQ: 0)
| (mrru? SC_MULTILINK: 0);
set_flags(ppp_dev_fd, flags);
/* connect up the channel */
if (ioctl(ppp_fd, PPPIOCCONNECT, &ifunit) < 0)
fatal("Couldn't attach to PPP unit %d: %m", ifunit);
add_fd(ppp_dev_fd);
#endif
}
/*
* make_new_bundle - create a new PPP unit (i.e. a bundle)
* and connect our channel to it. This should only get called
* if `multilink' was set at the time establish_ppp was called.
* In demand mode this uses our existing bundle instead of making
* a new one.
*/
void
make_new_bundle(int mrru, int mtru, int rssn, int tssn)
{
abort();
#ifdef notyet
if (!new_style_driver)
return;
/* make us a ppp unit */
if (make_ppp_unit() < 0)
die(1);
/* set the mrru, mtu and flags */
cfg_bundle(mrru, mtru, rssn, tssn);
#endif
}
/*
* bundle_attach - attach our link to a given PPP unit.
* We assume the unit is controlled by another pppd.
*/
int
bundle_attach(int ifnum)
{
abort();
#ifdef notyet
if (!new_style_driver)
return -1;
if (ioctl(ppp_dev_fd, PPPIOCATTACH, &ifnum) < 0) {
if (errno == ENXIO)
return 0; /* doesn't still exist */
fatal("Couldn't attach to interface unit %d: %m\n", ifnum);
}
if (ioctl(ppp_fd, PPPIOCCONNECT, &ifnum) < 0)
fatal("Couldn't connect to interface unit %d: %m", ifnum);
set_flags(ppp_dev_fd, get_flags(ppp_dev_fd) | SC_MULTILINK);
ifunit = ifnum;
#endif
return 1;
}
/*
* destroy_bundle - tell the driver to destroy our bundle.
*/
void destroy_bundle(void)
{
#if notyet
if (ppp_dev_fd >= 0) {
close(ppp_dev_fd);
remove_fd(ppp_dev_fd);
ppp_dev_fd = -1;
}
#endif
}
/*
* Check whether the link seems not to be 8-bit clean.
*/
void
clean_check(void)
{
int x;
char *s;
if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
s = NULL;
switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
case SC_RCV_B7_0:
s = "bit 7 set to 1";
break;
case SC_RCV_B7_1:
s = "bit 7 set to 0";
break;
case SC_RCV_EVNP:
s = "odd parity";
break;
case SC_RCV_ODDP:
s = "even parity";
break;
}
if (s != NULL) {
struct ppp_rawin win;
char buf[4 * sizeof(win.buf) + 1];
int i;
warn("Serial link is not 8-bit clean:");
warn("All received characters had %s", s);
if (ioctl(ppp_fd, PPPIOCGRAWIN, &win) == -1) {
warn("ioctl(PPPIOCGRAWIN): %s", strerror(errno));
return;
}
for (i = 0; i < sizeof(win.buf); i++)
win.buf[i] = win.buf[i] & 0x7f;
strvisx(buf, (char *)win.buf, win.count, VIS_CSTYLE);
warn("Last %d characters were: %s", (int)win.count, buf);
}
}
}
/*
* set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
* at the requested speed, etc. If `local' is true, set CLOCAL
* regardless of whether the modem option was specified.
*
* For *BSD, we assume that speed_t values numerically equal bits/second.
*/
void
set_up_tty(int fd, int local)
{
struct termios tios;
if (tcgetattr(fd, &tios) < 0)
fatal("tcgetattr: %m");
if (!restore_term) {
inittermios = tios;
ioctl(fd, TIOCGWINSZ, &wsinfo);
}
tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
if (crtscts > 0 && !local) {
if (crtscts == 2) {
#ifdef CDTRCTS
tios.c_cflag |= CDTRCTS;
#endif
} else
tios.c_cflag |= CRTSCTS;
} else if (crtscts < 0) {
tios.c_cflag &= ~CRTSCTS;
#ifdef CDTRCTS
tios.c_cflag &= ~CDTRCTS;
#endif
}
tios.c_cflag |= CS8 | CREAD | HUPCL;
if (local || !modem)
tios.c_cflag |= CLOCAL;
tios.c_iflag = IGNBRK | IGNPAR;
tios.c_oflag = 0;
tios.c_lflag = 0;
tios.c_cc[VMIN] = 1;
tios.c_cc[VTIME] = 0;
if (crtscts == -2) {
tios.c_iflag |= IXON | IXOFF;
tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
}
if (inspeed) {
cfsetospeed(&tios, inspeed);
cfsetispeed(&tios, inspeed);
} else {
inspeed = cfgetospeed(&tios);
/*
* We can't proceed if the serial port speed is 0,
* since that implies that the serial port is disabled.
*/
if (inspeed == 0)
fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
}
baud_rate = inspeed;
if (tcsetattr(fd, TCSAFLUSH, &tios) < 0)
fatal("tcsetattr: %m");
restore_term = 1;
}
/*
* restore_tty - restore the terminal to the saved settings.
*/
void
restore_tty(int fd)
{
if (restore_term) {
if (!default_device) {
/*
* Turn off echoing, because otherwise we can get into
* a loop with the tty and the modem echoing to each other.
* We presume we are the sole user of this tty device, so
* when we close it, it will revert to its defaults anyway.
*/
inittermios.c_lflag &= ~(ECHO | ECHONL);
}
if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
if (errno != ENXIO)
warn("tcsetattr: %m");
ioctl(fd, TIOCSWINSZ, &wsinfo);
restore_term = 0;
}
}
/*
* setdtr - control the DTR line on the serial port.
* This is called from die(), so it shouldn't call die().
*/
void
setdtr(int fd, int on)
{
int modembits = TIOCM_DTR;
ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
}
#ifdef INET6
/*
* sif6addr - Config the interface with an IPv6 link-local address
*/
int
sif6addr(int unit, eui64_t our_eui64, eui64_t his_eui64)
{
#ifdef __KAME__
int ifindex;
struct in6_aliasreq addreq6;
if (sock6_fd < 0) {
fatal("No IPv6 socket available");
/*NOTREACHED*/
}
/* actually, this part is not kame local - RFC2553 conformant */
ifindex = if_nametoindex(ifname);
if (ifindex == 0) {
error("sifaddr6: no interface %s", ifname);
return 0;
}
memset(&addreq6, 0, sizeof(addreq6));
strlcpy(addreq6.ifra_name, ifname, sizeof(addreq6.ifra_name));
/* my addr */
addreq6.ifra_addr.sin6_family = AF_INET6;
addreq6.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
addreq6.ifra_addr.sin6_addr.s6_addr[0] = 0xfe;
addreq6.ifra_addr.sin6_addr.s6_addr[1] = 0x80;
memcpy(&addreq6.ifra_addr.sin6_addr.s6_addr[8], &our_eui64,
sizeof(our_eui64));
/* KAME ifindex hack */
*(u_int16_t *)&addreq6.ifra_addr.sin6_addr.s6_addr[2] = htons(ifindex);
/* his addr */
addreq6.ifra_dstaddr.sin6_family = AF_INET6;
addreq6.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
addreq6.ifra_dstaddr.sin6_addr.s6_addr[0] = 0xfe;
addreq6.ifra_dstaddr.sin6_addr.s6_addr[1] = 0x80;
memcpy(&addreq6.ifra_dstaddr.sin6_addr.s6_addr[8], &his_eui64,
sizeof(our_eui64));
/* KAME ifindex hack */
*(u_int16_t *)&addreq6.ifra_dstaddr.sin6_addr.s6_addr[2] = htons(ifindex);
/* prefix mask: 128bit */
addreq6.ifra_prefixmask.sin6_family = AF_INET6;
addreq6.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
memset(&addreq6.ifra_prefixmask.sin6_addr, 0xff,
sizeof(addreq6.ifra_prefixmask.sin6_addr));
/* address lifetime (infty) */
addreq6.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
addreq6.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
if (ioctl(sock6_fd, SIOCAIFADDR_IN6, &addreq6) < 0) {
error("sif6addr: ioctl(SIOCAIFADDR_IN6): %m");
return 0;
}
return 1;
#else
struct in6_ifreq ifr6;
struct ifreq ifr;
struct in6_rtmsg rt6;
if (sock6_fd < 0) {
fatal("No IPv6 socket available");
/*NOTREACHED*/
}
memset(&ifr, 0, sizeof (ifr));
strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) {
error("sif6addr: ioctl(SIOCGIFINDEX): %m");
return 0;
}
/* Local interface */
memset(&ifr6, 0, sizeof(ifr6));
IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
ifr6.ifr6_ifindex = ifindex;
ifr6.ifr6_prefixlen = 10;
if (ioctl(sock6_fd, SIOCSIFADDR, &ifr6) < 0) {
error("sif6addr: ioctl(SIOCSIFADDR): %m");
return 0;
}
/* Route to remote host */
memset(&rt6, 0, sizeof(rt6));
IN6_LLADDR_FROM_EUI64(rt6.rtmsg_dst, his_eui64);
rt6.rtmsg_flags = RTF_UP | RTF_HOST;
rt6.rtmsg_dst_len = 128;
rt6.rtmsg_ifindex = ifr.ifr_ifindex;
rt6.rtmsg_metric = 1;
if (ioctl(sock6_fd, SIOCADDRT, &rt6) < 0) {
error("sif6addr: ioctl(SIOCADDRT): %m");
return 0;
}
return 1;
#endif
}
/*
* cif6addr - Remove IPv6 address from interface
*/
int
cif6addr(int unit, eui64_t our_eui64, eui64_t his_eui64)
{
#ifdef __KAME__
int ifindex;
struct in6_ifreq delreq6;
if (sock6_fd < 0) {
fatal("No IPv6 socket available");
/*NOTREACHED*/
}
/* actually, this part is not kame local - RFC2553 conformant */
ifindex = if_nametoindex(ifname);
if (ifindex == 0) {
error("cifaddr6: no interface %s", ifname);
return 0;
}
memset(&delreq6, 0, sizeof(delreq6));
strlcpy(delreq6.ifr_name, ifname, sizeof(delreq6.ifr_name));
/* my addr */
delreq6.ifr_ifru.ifru_addr.sin6_family = AF_INET6;
delreq6.ifr_ifru.ifru_addr.sin6_len = sizeof(struct sockaddr_in6);
delreq6.ifr_ifru.ifru_addr.sin6_addr.s6_addr[0] = 0xfe;
delreq6.ifr_ifru.ifru_addr.sin6_addr.s6_addr[1] = 0x80;
memcpy(&delreq6.ifr_ifru.ifru_addr.sin6_addr.s6_addr[8], &our_eui64,
sizeof(our_eui64));
/* KAME ifindex hack */
*(u_int16_t *)&delreq6.ifr_ifru.ifru_addr.sin6_addr.s6_addr[2] =
htons(ifindex);
if (ioctl(sock6_fd, SIOCDIFADDR_IN6, &delreq6) < 0) {
error("cif6addr: ioctl(SIOCDIFADDR_IN6): %m");
return 0;
}
return 1;
#else
struct ifreq ifr;
struct in6_ifreq ifr6;
if (sock6_fd < 0) {
fatal("No IPv6 socket available");
/*NOTREACHED*/
}
memset(&ifr, 0, sizeof(ifr));
strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) {
error("cif6addr: ioctl(SIOCGIFINDEX): %m");
return 0;
}
memset(&ifr6, 0, sizeof(ifr6));
IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
ifr6.ifr6_ifindex = ifr.ifr_ifindex;
ifr6.ifr6_prefixlen = 10;
if (ioctl(sock6_fd, SIOCDIFADDR, &ifr6) < 0) {
if (errno != EADDRNOTAVAIL) {
if (! ok_error (errno))
error("cif6addr: ioctl(SIOCDIFADDR): %m");
}
else {
warn("cif6addr: ioctl(SIOCDIFADDR): No such address");
}
return (0);
}
return 1;
#endif
}
#endif /* INET6 */
/*
* get_pty - get a pty master/slave pair and chown the slave side
* to the uid given. Assumes slave_name points to >= 12 bytes of space.
*/
int
get_pty(int *master_fdp, int *slave_fdp, char *slave_name, int uid)
{
struct termios tios;
if (openpty(master_fdp, slave_fdp, slave_name, NULL, NULL) < 0)
return 0;
fchown(*slave_fdp, uid, -1);
fchmod(*slave_fdp, S_IRUSR | S_IWUSR);
if (tcgetattr(*slave_fdp, &tios) == 0) {
tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
tios.c_cflag |= CS8 | CREAD;
tios.c_iflag = IGNPAR | CLOCAL;
tios.c_oflag = 0;
tios.c_lflag = 0;
if (tcsetattr(*slave_fdp, TCSAFLUSH, &tios) < 0)
warn("couldn't set attributes on pty: %m");
} else
warn("couldn't get attributes on pty: %m");
return 1;
}
/*
* open_ppp_loopback - open the device we use for getting
* packets in demand mode, and connect it to a ppp interface.
* Here we use a pty.
*/
int
open_ppp_loopback(void)
{
int flags;
struct termios tios;
int pppdisc = PPPDISC;
if (openpty(&loop_master, &loop_slave, loop_name, NULL, NULL) < 0)
fatal("No free pty for loopback");
SYSDEBUG(("using %s for loopback", loop_name));
if (tcgetattr(loop_slave, &tios) == 0) {
tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
tios.c_cflag |= CS8 | CREAD;
tios.c_iflag = IGNPAR;
tios.c_oflag = 0;
tios.c_lflag = 0;
if (tcsetattr(loop_slave, TCSAFLUSH, &tios) < 0)
warn("couldn't set attributes on loopback: %m");
}
if ((flags = fcntl(loop_master, F_GETFL)) != -1)
if (fcntl(loop_master, F_SETFL, flags | O_NONBLOCK) == -1)
warn("couldn't set loopback to nonblock: %m");
ppp_fd = loop_slave;
if (ioctl(ppp_fd, TIOCSETD, &pppdisc) < 0)
fatal("ioctl(TIOCSETD): %m");
/*
* Find out which interface we were given.
*/
if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
fatal("ioctl(PPPIOCGUNIT): %m");
/*
* Enable debug in the driver if requested.
*/
if (kdebugflag) {
flags = get_flags(ppp_fd);
flags |= (kdebugflag & 0xFF) * SC_DEBUG;
set_flags(ppp_fd, flags);
}
return loop_master;
}
/*
* output - Output PPP packet.
*/
void
output(int unit, u_char *p, int len)
{
if (debug)
dbglog("sent %P", p, len);
if (write(ttyfd, p, len) < 0) {
if (errno != EIO)
error("write: %m");
}
}
/*
* wait_input - wait until there is data available,
* for the length of time specified by *timo (indefinite
* if timo is NULL).
*/
void
wait_input(struct timeval *timo)
{
fd_set ready;
int n;
ready = in_fds;
n = select(max_in_fd + 1, &ready, NULL, &ready, timo);
if (n < 0 && errno != EINTR)
fatal("select: %m");
}
/*
* add_fd - add an fd to the set that wait_input waits for.
*/
void add_fd(int fd)
{
if (fd >= FD_SETSIZE)
fatal("descriptor too big");
FD_SET(fd, &in_fds);
if (fd > max_in_fd)
max_in_fd = fd;
}
/*
* remove_fd - remove an fd from the set that wait_input waits for.
*/
void remove_fd(int fd)
{
FD_CLR(fd, &in_fds);
}
#if 0
/*
* wait_loop_output - wait until there is data available on the
* loopback, for the length of time specified by *timo (indefinite
* if timo is NULL).
*/
void
wait_loop_output(struct timeval *timo)
{
fd_set ready;
int n;
FD_ZERO(&ready);
if (loop_master >= FD_SETSIZE)
fatal("descriptor too big");
FD_SET(loop_master, &ready);
n = select(loop_master + 1, &ready, NULL, &ready, timo);
if (n < 0 && errno != EINTR)
fatal("select: %m");
}
/*
* wait_time - wait for a given length of time or until a
* signal is received.
*/
void
wait_time(struct timeval *timo)
{
int n;
n = select(0, NULL, NULL, NULL, timo);
if (n < 0 && errno != EINTR)
fatal("select: %m");
}
#endif
/*
* read_packet - get a PPP packet from the serial device.
*/
int
read_packet(u_char *buf)
{
int len;
if ((len = read(ttyfd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
if (errno == EWOULDBLOCK || errno == EINTR)
return -1;
fatal("read: %m");
}
return len;
}
/*
* get_loop_output - read characters from the loopback, form them
* into frames, and detect when we want to bring the real link up.
* Return value is 1 if we need to bring up the link, 0 otherwise.
*/
int
get_loop_output(void)
{
int rv = 0;
int n;
while ((n = read(loop_master, inbuf, sizeof(inbuf))) >= 0) {
if (loop_chars(inbuf, n))
rv = 1;
}
if (n == 0)
fatal("eof on loopback");
if (n == -1 && errno != EWOULDBLOCK)
fatal("read from loopback: %m");
return rv;
}
/*
* netif_set_mtu - set the MTU on the PPP network interface.
*/
void
netif_set_mtu(int unit, int mtu)
{
struct ifreq ifr;
SYSDEBUG((LOG_DEBUG, "netif_set_mtu: mtu = %d\n", mtu));
memset(&ifr, '\0', sizeof (ifr));
strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
ifr.ifr_mtu = mtu;
if (ifunit >= 0 && ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
fatal("ioctl(SIOCSIFMTU): %m");
}
/*
* netif_get_mtu - get the MTU on the PPP network interface.
*/
int
netif_get_mtu(int unit)
{
struct ifreq ifr;
memset (&ifr, '\0', sizeof (ifr));
strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
if (ifunit >= 0 && ioctl(sock_fd, SIOCGIFMTU, (caddr_t) &ifr) < 0) {
error("ioctl(SIOCGIFMTU): %m (line %d)", __LINE__);
return 0;
}
return ifr.ifr_mtu;
}
/*
* tty_send_config - configure the transmit characteristics of
* the ppp interface.
*/
void
tty_send_config(int mtu, u_int32_t asyncmap, int pcomp, int accomp)
{
u_int x;
#if 0
/* Linux code does not do anything with the mtu here */
ifnet_set_mtu(-1, mtu);
#endif
if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0)
fatal("ioctl(PPPIOCSASYNCMAP): %m");
x = get_flags(ppp_fd);
x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
x = sync_serial ? x | SC_SYNC : x & ~SC_SYNC;
set_flags(ppp_fd, x);
}
/*
* ppp_set_xaccm - set the extended transmit ACCM for the interface.
*/
void
tty_set_xaccm(ext_accm accm)
{
if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
warn("ioctl(set extended ACCM): %m");
}
/*
* ppp_recv_config - configure the receive-side characteristics of
* the ppp interface.
*/
void
tty_recv_config(int mru, u_int32_t asyncmap, int pcomp, int accomp)
{
int x;
if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
fatal("ioctl(PPPIOCSMRU): %m");
if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0)
fatal("ioctl(PPPIOCSRASYNCMAP): %m");
x = get_flags(ppp_fd);
x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
set_flags(ppp_fd, x);
}
/*
* ccp_test - ask kernel whether a given compression method
* is acceptable for use. Returns 1 if the method and parameters
* are OK, 0 if the method is known but the parameters are not OK
* (e.g. code size should be reduced), or -1 if the method is unknown.
*/
int
ccp_test(int unit, u_char *opt_ptr, int opt_len, int for_transmit)
{
struct ppp_option_data data;
data.ptr = opt_ptr;
data.length = opt_len;
data.transmit = for_transmit;
if (ioctl(ttyfd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
return 1;
return (errno == ENOBUFS)? 0: -1;
}
/*
* ccp_flags_set - inform kernel about the current state of CCP.
*/
void
ccp_flags_set(int unit, int isopen, int isup)
{
int x;
x = get_flags(ppp_fd);
x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
set_flags(ppp_fd, x);
}
/*
* ccp_fatal_error - returns 1 if decompression was disabled as a
* result of an error detected after decompression of a packet,
* 0 otherwise. This is necessary because of patent nonsense.
*/
int
ccp_fatal_error(int unit)
{
int x;
x = get_flags(ppp_fd);
return x & SC_DC_FERROR;
}
/*
* get_idle_time - return how long the link has been idle.
*/
int
get_idle_time(int u, struct ppp_idle *ip)
{
return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
}
/*
* get_ppp_stats - return statistics for the link.
*/
int
get_ppp_stats(int u, struct pppd_stats *stats)
{
struct ifpppstatsreq req;
memset (&req, 0, sizeof (req));
strlcpy(req.ifr_name, ifname, sizeof(req.ifr_name));
if (ioctl(sock_fd, SIOCGPPPSTATS, &req) < 0) {
error("Couldn't get PPP statistics: %m");
return 0;
}
stats->bytes_in = req.stats.p.ppp_ibytes;
stats->bytes_out = req.stats.p.ppp_obytes;
stats->pkts_in = req.stats.p.ppp_ipackets;
stats->pkts_out = req.stats.p.ppp_opackets;
return 1;
}
#ifdef PPP_FILTER
/*
* set_filters - transfer the pass and active filters to the kernel.
*/
int
set_filters(struct bpf_program *pass_in, struct bpf_program *pass_out,
struct bpf_program *active_in, struct bpf_program *active_out)
{
int ret = 1;
if (pass_in->bf_len > 0) {
if (ioctl(ppp_fd, PPPIOCSIPASS, pass_in) < 0) {
error("Couldn't set pass-filter-in in kernel: %m");
ret = 0;
}
}
if (pass_out->bf_len > 0) {
if (ioctl(ppp_fd, PPPIOCSOPASS, pass_out) < 0) {
error("Couldn't set pass-filter-out in kernel: %m");
ret = 0;
}
}
if (active_in->bf_len > 0) {
if (ioctl(ppp_fd, PPPIOCSIACTIVE, active_in) < 0) {
error("Couldn't set active-filter-in in kernel: %m");
ret = 0;
}
}
if (active_out->bf_len > 0) {
if (ioctl(ppp_fd, PPPIOCSOACTIVE, active_out) < 0) {
error("Couldn't set active-filter-out in kernel: %m");
ret = 0;
}
}
return ret;
}
#endif
/*
* sifvjcomp - config tcp header compression
*/
int
sifvjcomp(int u, int vjcomp, int cidcomp, int maxcid)
{
u_int x;
x = get_flags(ppp_fd);
x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
set_flags(ppp_fd, x);
if (vjcomp && ioctl(ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
error("ioctl(PPPIOCSMAXCID): %m");
return 0;
}
return 1;
}
/*
* sifup - Config the interface up and enable IP packets to pass.
*/
int
sifup(int u)
{
struct ifreq ifr;
strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
error("ioctl (SIOCGIFFLAGS): %m");
return 0;
}
ifr.ifr_flags |= IFF_UP;
if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
error("ioctl(SIOCSIFFLAGS): %m");
return 0;
}
if_is_up = 1;
return 1;
}
/*
* sifnpmode - Set the mode for handling packets for a given NP.
*/
int
sifnpmode(int u, int proto, enum NPmode mode)
{
struct npioctl npi;
npi.protocol = proto;
npi.mode = mode;
if (ioctl(ppp_fd, PPPIOCSNPMODE, &npi) < 0) {
error("ioctl(set NP %d mode to %d): %m", proto, mode);
return 0;
}
return 1;
}
/*
* sifdown - Config the interface down and disable IP.
*/
int
sifdown(int u)
{
struct ifreq ifr;
int rv;
struct npioctl npi;
rv = 1;
npi.protocol = PPP_IP;
npi.mode = NPMODE_ERROR;
ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi);
/* ignore errors, because ppp_fd might have been closed by now. */
strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
error("ioctl (SIOCGIFFLAGS): %m");
rv = 0;
} else {
ifr.ifr_flags &= ~IFF_UP;
if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
error("ioctl(SIOCSIFFLAGS): %m");
rv = 0;
} else
if_is_up = 0;
}
return rv;
}
/*
* SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
* if it exists.
*/
#define SET_SA_FAMILY(addr, family) \
BZERO((char *) &(addr), sizeof(addr)); \
addr.sa_family = (family); \
addr.sa_len = sizeof(addr);
/*
* sifaddr - Config the interface IP addresses and netmask.
*/
int
sifaddr(int u, u_int32_t o, u_int32_t h, u_int32_t m)
{
struct ifaliasreq ifra;
struct ifreq ifr;
strlcpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
if (m != 0) {
SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
} else
BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
BZERO(&ifr, sizeof(ifr));
strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
if (ioctl(sock_fd, SIOCDIFADDR, (caddr_t) &ifr) < 0) {
if (errno != EADDRNOTAVAIL)
warn("Couldn't remove interface address: %m");
}
if (ioctl(sock_fd, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
if (errno != EEXIST) {
error("Couldn't set interface address: %m");
return 0;
}
warn("Couldn't set interface address: Address %I already exists", o);
}
ifaddrs[0] = o;
ifaddrs[1] = h;
return 1;
}
/*
* cifaddr - Clear the interface IP addresses, and delete routes
* through the interface if possible.
*/
int
cifaddr(int u, u_int32_t o, u_int32_t h)
{
struct ifaliasreq ifra;
ifaddrs[0] = 0;
strlcpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
if (ioctl(sock_fd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
if (errno != EADDRNOTAVAIL)
warn("Couldn't delete interface address: %m");
return 0;
}
return 1;
}
/*
* sifdefaultroute - assign a default route through the address given.
*/
int
sifdefaultroute(int u, u_int32_t l, u_int32_t g)
{
return dodefaultroute(g, 's');
}
/*
* cifdefaultroute - delete a default route through the address given.
*/
int
cifdefaultroute(int u, u_int32_t l, u_int32_t g)
{
return dodefaultroute(g, 'c');
}
/*
* dodefaultroute - talk to a routing socket to add/delete a default route.
*/
static int
dodefaultroute(u_int32_t g, int cmd)
{
int routes;
struct {
struct rt_msghdr hdr;
struct sockaddr_in dst;
struct sockaddr_in gway;
struct sockaddr_in netmask;
struct sockaddr_dl ifp;
} rtmsg;
if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
error("Couldn't %s default route: socket: %m",
cmd == 's' ? "add" : "delete");
return 0;
}
memset(&rtmsg, 0, sizeof(rtmsg));
rtmsg.hdr.rtm_type = cmd == 's' ? RTM_ADD : RTM_DELETE;
rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
rtmsg.hdr.rtm_version = RTM_VERSION;
rtmsg.hdr.rtm_seq = ++rtm_seq;
rtmsg.hdr.rtm_addrs =
RTA_DST | RTA_GATEWAY | RTA_NETMASK | RTA_IFP;
rtmsg.dst.sin_len = sizeof(rtmsg.dst);
rtmsg.dst.sin_family = AF_INET;
rtmsg.dst.sin_addr.s_addr = 0;
rtmsg.gway.sin_len = sizeof(rtmsg.gway);
rtmsg.gway.sin_family = AF_INET;
rtmsg.gway.sin_addr.s_addr = g;
rtmsg.netmask.sin_len = sizeof(rtmsg.netmask);
rtmsg.netmask.sin_family = AF_INET;
rtmsg.netmask.sin_addr.s_addr = 0;
rtmsg.ifp.sdl_family = AF_LINK;
rtmsg.ifp.sdl_len = sizeof(rtmsg.ifp);
link_addr(ifname, &rtmsg.ifp);
rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
error("Couldn't %s default route: %m",
cmd == 's' ? "add" : "delete");
close(routes);
return 0;
}
close(routes);
default_route_gateway = (cmd == 's') ? g : 0;
return 1;
}
#if RTM_VERSION >= 3
/*
* sifproxyarp - Make a proxy ARP entry for the peer.
*/
static struct {
struct rt_msghdr hdr;
struct sockaddr_inarp dst;
struct sockaddr_dl hwa;
char extra[128];
} arpmsg;
static int arpmsg_valid;
int
sifproxyarp(int unit, u_int32_t hisaddr)
{
int routes;
/*
* Get the hardware address of an interface on the same subnet
* as our local address.
*/
memset(&arpmsg, 0, sizeof(arpmsg));
if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
error("Cannot determine ethernet address for proxy ARP");
return 0;
}
if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
error("Couldn't add proxy arp entry: socket: %m");
return 0;
}
arpmsg.hdr.rtm_type = RTM_ADD;
arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
arpmsg.hdr.rtm_version = RTM_VERSION;
arpmsg.hdr.rtm_seq = ++rtm_seq;
arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
arpmsg.hdr.rtm_inits = RTV_EXPIRE;
arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
arpmsg.dst.sin_family = AF_INET;
arpmsg.dst.sin_addr.s_addr = hisaddr;
arpmsg.dst.sin_other = SIN_PROXY;
arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
+ RT_ROUNDUP(arpmsg.hwa.sdl_len);
if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
error("Couldn't add proxy arp entry: %m");
close(routes);
return 0;
}
close(routes);
arpmsg_valid = 1;
proxy_arp_addr = hisaddr;
return 1;
}
/*
* cifproxyarp - Delete the proxy ARP entry for the peer.
*/
int
cifproxyarp(int unit, u_int32_t hisaddr)
{
int routes;
if (!arpmsg_valid)
return 0;
arpmsg_valid = 0;
arpmsg.hdr.rtm_type = RTM_DELETE;
arpmsg.hdr.rtm_seq = ++rtm_seq;
if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
error("Couldn't delete proxy arp entry: socket: %m");
return 0;
}
if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
error("Couldn't delete proxy arp entry: %m");
close(routes);
return 0;
}
close(routes);
proxy_arp_addr = 0;
return 1;
}
#else /* RTM_VERSION */
/*
* sifproxyarp - Make a proxy ARP entry for the peer.
*/
int
sifproxyarp(int unit, u_int32_t hisaddr)
{
struct arpreq arpreq;
struct {
struct sockaddr_dl sdl;
char space[128];
} dls;
BZERO(&arpreq, sizeof(arpreq));
/*
* Get the hardware address of an interface on the same subnet
* as our local address.
*/
if (!get_ether_addr(hisaddr, &dls.sdl)) {
error("Cannot determine ethernet address for proxy ARP");
return 0;
}
arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
arpreq.arp_ha.sa_family = AF_UNSPEC;
BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
arpreq.arp_flags = ATF_PERM | ATF_PUBL;
if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0) {
error("Couldn't add proxy arp entry: %m");
return 0;
}
proxy_arp_addr = hisaddr;
return 1;
}
/*
* cifproxyarp - Delete the proxy ARP entry for the peer.
*/
int
cifproxyarp(int unit, u_int32_t hisaddr)
{
struct arpreq arpreq;
BZERO(&arpreq, sizeof(arpreq));
SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0) {
warn("Couldn't delete proxy arp entry: %m");
return 0;
}
proxy_arp_addr = 0;
return 1;
}
#endif /* RTM_VERSION */
/*
* get_ether_addr - get the hardware address of an interface on the
* the same subnet as ipaddr.
*/
static int
get_ether_addr(u_int32_t ipaddr, struct sockaddr_dl *hwaddr)
{
u_int32_t ina, mask;
struct sockaddr_dl *dla;
struct ifaddrs *ifap, *ifa, *ifp;
/*
* Scan through looking for an interface with an Internet
* address on the same subnet as `ipaddr'.
*/
if (getifaddrs(&ifap) != 0) {
error("getifaddrs: %m");
return 0;
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
ina = ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr.s_addr;
/*
* Check that the interface is up, and not point-to-point
* or loopback.
*/
if ((ifa->ifa_flags &
(IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
!= (IFF_UP|IFF_BROADCAST))
continue;
/*
* Get its netmask and check that it's on the right subnet.
*/
mask = ((struct sockaddr_in *) ifa->ifa_netmask)->sin_addr.s_addr;
if ((ipaddr & mask) != (ina & mask))
continue;
break;
}
if (!ifa) {
freeifaddrs(ifap);
return 0;
}
info("found interface %s for proxy arp", ifa->ifa_name);
ifp = ifa;
/*
* Now scan through again looking for a link-level address
* for this interface.
*/
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (strcmp(ifp->ifa_name, ifa->ifa_name) != 0)
continue;
if (ifa->ifa_addr->sa_family != AF_LINK)
continue;
/*
* Found the link-level address - copy it out
*/
dla = (struct sockaddr_dl *) ifa->ifa_addr;
BCOPY(dla, hwaddr, dla->sdl_len);
freeifaddrs(ifap);
return 1;
}
freeifaddrs(ifap);
return 0;
}
/*
* get_if_hwaddr - get the hardware address for the specified
* network interface device.
*/
int
get_if_hwaddr(u_char *addr, char *name)
{
#define IFREQ_SAFE (sizeof(struct ifreq) + sizeof(struct sockaddr_dl))
/* XXX sockaddr_dl is larger than the sockaddr in struct ifreq! */
union { /* XXX */
struct ifreq _ifreq; /* XXX */
char _X[IFREQ_SAFE]; /* XXX */
} _ifreq_dontsmashstack; /* XXX */
#define ifreq_xxx _ifreq_dontsmashstack._ifreq /* XXX */
struct sockaddr_dl *sdl = (struct sockaddr_dl *) &ifreq_xxx.ifr_addr;
int fd;
if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
return 0;
(void)memset(sdl, 0, sizeof(*sdl));
sdl->sdl_family = AF_LINK;
(void)strlcpy(ifreq_xxx.ifr_name, name, sizeof(ifreq_xxx.ifr_name));
if (ioctl(fd, SIOCGIFADDR, &ifreq_xxx) == -1) {
(void)close(fd);
return 0;
}
(void)close(fd);
(void)memcpy(addr, LLADDR(sdl), sdl->sdl_alen);
return sdl->sdl_nlen;
}
/*
* get_first_ethernet - return the name of the first ethernet-style
* interface on this system.
*/
char *
get_first_ethernet(void)
{
static char ifname[IFNAMSIZ];
struct ifaddrs *ifap, *ifa;
/*
* Scan through the system's network interfaces.
*/
if (getifaddrs(&ifap) != 0) {
warn("getifaddrs: %m");
return NULL;
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
/*
* Check the interface's internet address.
*/
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
/*
* Check that the interface is up, and not point-to-point or loopback.
*/
if ((ifa->ifa_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
!= IFF_UP) {
strlcpy(ifname, ifa->ifa_name, sizeof(ifname));
freeifaddrs(ifap);
return ifname;
}
}
freeifaddrs(ifap);
return NULL;
}
/*
* Return user specified netmask, modified by any mask we might determine
* for address `addr' (in network byte order).
* Here we scan through the system's list of interfaces, looking for
* any non-point-to-point interfaces which might appear to be on the same
* network as `addr'. If we find any, we OR in their netmask to the
* user-specified netmask.
*/
u_int32_t
GetMask(u_int32_t addr)
{
u_int32_t mask, nmask, ina;
struct ifaddrs *ifap, *ifa;
addr = ntohl(addr);
if (IN_CLASSA(addr)) /* determine network mask for address class */
nmask = IN_CLASSA_NET;
else if (IN_CLASSB(addr))
nmask = IN_CLASSB_NET;
else
nmask = IN_CLASSC_NET;
/* class D nets are disallowed by bad_ip_adrs */
mask = netmask | htonl(nmask);
/*
* Scan through the system's network interfaces.
*/
if (getifaddrs(&ifap) != 0) {
warn("getifaddrs: %m");
return 0;
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
/*
* Check the interface's internet address.
*/
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
ina = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr;
if ((ntohl(ina) & nmask) != (addr & nmask))
continue;
/*
* Check that the interface is up, and not point-to-point or loopback.
*/
if ((ifa->ifa_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK)) != IFF_UP)
continue;
/*
* Get its netmask and OR it into our mask.
*/
mask |= ((struct sockaddr_in *)&ifa->ifa_netmask)->sin_addr.s_addr;
}
freeifaddrs(ifap);
return mask;
}
/*
* have_route_to - determine if the system has any route to
* a given IP address.
* For demand mode to work properly, we have to ignore routes
* through our own interface.
*/
int have_route_to(u_int32_t addr)
{
return -1;
}
/*
* Use the hostid as part of the random number seed.
*/
int
get_host_seed(void)
{
return gethostid();
}
#if 0
/*
* lock - create a lock file for the named lock device
*/
#define LOCK_PREFIX "/var/spool/lock/LCK.."
static char *lock_file; /* name of lock file created */
int
lock(char *dev)
{
char hdb_lock_buffer[12];
int fd, pid, n;
char *p;
size_t l;
if ((p = strrchr(dev, '/')) != NULL)
dev = p + 1;
l = strlen(LOCK_PREFIX) + strlen(dev) + 1;
lock_file = malloc(l);
if (lock_file == NULL)
novm("lock file name");
slprintf(lock_file, l, "%s%s", LOCK_PREFIX, dev);
while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
if (errno == EEXIST
&& (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
/* Read the lock file to find out who has the device locked */
n = read(fd, hdb_lock_buffer, 11);
if (n <= 0) {
error("Can't read pid from lock file %s", lock_file);
close(fd);
} else {
hdb_lock_buffer[n] = 0;
pid = atoi(hdb_lock_buffer);
if (kill(pid, 0) == -1 && errno == ESRCH) {
/* pid no longer exists - remove the lock file */
if (unlink(lock_file) == 0) {
close(fd);
notice("Removed stale lock on %s (pid %d)",
dev, pid);
continue;
} else
warn("Couldn't remove stale lock on %s",
dev);
} else
notice("Device %s is locked by pid %d",
dev, pid);
}
close(fd);
} else
error("Can't create lock file %s: %m", lock_file);
free(lock_file);
lock_file = NULL;
return -1;
}
slprintf(hdb_lock_buffer, sizeof(hdb_lock_buffer), "%10d\n", getpid());
write(fd, hdb_lock_buffer, 11);
close(fd);
return 0;
}
/*
* unlock - remove our lockfile
*/
void
unlock(void)
{
if (lock_file) {
unlink(lock_file);
free(lock_file);
lock_file = NULL;
}
}
#endif