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NetBSD/usr.sbin/pppd/sys-bsd.c

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/*
* sys-bsd.c - System-dependent procedures for setting up
* PPP interfaces on bsd-4.4-ish systems (including 386BSD, NetBSD, etc.)
*
* Copyright (c) 1989 Carnegie Mellon University.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by Carnegie Mellon University. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char rcsid[] = "$Id: sys-bsd.c,v 1.2 1993/11/10 01:34:34 paulus Exp $";
#endif
/*
* TODO:
*/
#include <syslog.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/errno.h>
#include <net/if.h>
#include <net/if_ppp.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include "pppd.h"
#include "ppp.h"
static int initdisc; /* Initial TTY discipline */
/*
* establish_ppp - Turn the serial port into a ppp interface.
*/
void
establish_ppp()
{
int pppdisc = PPPDISC;
if (ioctl(fd, TIOCGETD, &initdisc) < 0) {
syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
die(1);
}
if (ioctl(fd, TIOCSETD, &pppdisc) < 0) {
syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
die(1);
}
/*
* Find out which interface we were given.
*/
if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
die(1);
}
}
/*
* disestablish_ppp - Restore the serial port to normal operation.
* This shouldn't call die() because it's called from die().
*/
void
disestablish_ppp()
{
if (ioctl(fd, TIOCSETD, &initdisc) < 0)
syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
}
/*
* output - Output PPP packet.
*/
void
output(unit, p, len)
int unit;
u_char *p;
int len;
{
if (unit != 0)
MAINDEBUG((LOG_WARNING, "output: unit != 0!"));
if (write(fd, p, len) < 0) {
syslog(LOG_ERR, "write: %m");
die(1);
}
}
/*
* read_packet - get a PPP packet from the serial device.
*/
int
read_packet(buf)
u_char *buf;
{
int len;
if ((len = read(fd, buf, MTU + DLLHEADERLEN)) < 0) {
if (errno == EWOULDBLOCK) {
MAINDEBUG((LOG_DEBUG, "read(fd): EWOULDBLOCK"));
return -1;
}
syslog(LOG_ERR, "read(fd): %m");
die(1);
}
return len;
}
/*
* ppp_send_config - configure the transmit characteristics of
* the ppp interface.
*/
void
ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
int unit, mtu;
u_long asyncmap;
int pcomp, accomp;
{
u_int x;
struct ifreq ifr;
strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
ifr.ifr_mtu = mtu;
if (ioctl(s, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
quit();
}
if (ioctl(fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
quit();
}
if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
quit();
}
x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
quit();
}
}
/*
* ppp_recv_config - configure the receive-side characteristics of
* the ppp interface. At present this does nothing.
*/
void
ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
int unit, mru;
u_long asyncmap;
int pcomp, accomp;
{
#ifdef notyet
if (ioctl(fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m");
quit();
}
if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
quit();
}
x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
quit();
}
#endif /* notyet */
}
/*
* sifvjcomp - config tcp header compression
*/
int
sifvjcomp(u, vjcomp, cidcomp)
{
u_int x;
if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
return 0;
}
x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
if(ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
return 0;
}
return 1;
}
/*
* sifup - Config the interface up.
*/
int
sifup(u)
{
struct ifreq ifr;
strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
return 0;
}
ifr.ifr_flags |= IFF_UP;
if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
return 0;
}
return 1;
}
/*
* sifdown - Config the interface down.
*/
int
sifdown(u)
{
struct ifreq ifr;
strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
return 0;
}
ifr.ifr_flags &= ~IFF_UP;
if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
return 0;
}
return 1;
}
/*
* 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(u, o, h, m)
{
struct ifaliasreq ifra;
strncpy(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));
if (ioctl(s, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
if (errno != EEXIST) {
syslog(LOG_ERR, "ioctl(SIOCAIFADDR): %m");
return 0;
}
syslog(LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists");
}
return 1;
}
/*
* cifaddr - Clear the interface IP addresses, and delete routes
* through the interface if possible.
*/
int
cifaddr(u, o, h)
{
struct ifaliasreq ifra;
strncpy(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(s, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
syslog(LOG_WARNING, "ioctl(SIOCDIFADDR): %m");
return 0;
}
return 1;
}
/*
* sifdefaultroute - assign a default route through the address given.
*/
int
sifdefaultroute(u, g)
{
struct ortentry rt;
SET_SA_FAMILY(rt.rt_dst, AF_INET);
SET_SA_FAMILY(rt.rt_gateway, AF_INET);
((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g;
rt.rt_flags = RTF_GATEWAY;
if (ioctl(s, SIOCADDRT, &rt) < 0) {
syslog(LOG_ERR, "default route ioctl(SIOCADDRT): %m");
return 0;
}
return 1;
}
/*
* cifdefaultroute - delete a default route through the address given.
*/
int
cifdefaultroute(u, g)
{
struct ortentry rt;
SET_SA_FAMILY(rt.rt_dst, AF_INET);
SET_SA_FAMILY(rt.rt_gateway, AF_INET);
((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g;
rt.rt_flags = RTF_GATEWAY;
if (ioctl(s, SIOCDELRT, &rt) < 0)
syslog(LOG_WARNING, "default route ioctl(SIOCDELRT): %m");
}
/*
* sifproxyarp - Make a proxy ARP entry for the peer.
*/
int
sifproxyarp(unit, hisaddr)
int unit;
u_long hisaddr;
{
struct arpreq arpreq;
BZERO(&arpreq, sizeof(arpreq));
/*
* Get the hardware address of an interface on the same subnet
* as our local address.
*/
if (!get_ether_addr(hisaddr, &arpreq.arp_ha)) {
syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
return 0;
}
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(s, SIOCSARP, (caddr_t)&arpreq) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSARP): %m");
return 0;
}
return 1;
}
/*
* cifproxyarp - Delete the proxy ARP entry for the peer.
*/
int
cifproxyarp(unit, hisaddr)
int unit;
u_long 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(s, SIOCDARP, (caddr_t)&arpreq) < 0) {
syslog(LOG_WARNING, "ioctl(SIOCDARP): %m");
return 0;
}
return 1;
}
/*
* get_ether_addr - get the hardware address of an interface on the
* the same subnet as ipaddr.
*/
#define MAX_IFS 32
int
get_ether_addr(ipaddr, hwaddr)
u_long ipaddr;
struct sockaddr *hwaddr;
{
struct ifreq *ifr, *ifend, *ifp;
u_long ina, mask;
struct sockaddr_dl *dla;
struct ifreq ifreq;
struct ifconf ifc;
struct ifreq ifs[MAX_IFS];
ifc.ifc_len = sizeof(ifs);
ifc.ifc_req = ifs;
if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
return 0;
}
/*
* Scan through looking for an interface with an Internet
* address on the same subnet as `ipaddr'.
*/
ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
for (ifr = ifc.ifc_req; ifr < ifend; ) {
if (ifr->ifr_addr.sa_family == AF_INET) {
ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
/*
* Check that the interface is up, and not point-to-point
* or loopback.
*/
if (ioctl(s, SIOCGIFFLAGS, &ifreq) < 0)
continue;
if ((ifreq.ifr_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.
*/
if (ioctl(s, SIOCGIFNETMASK, &ifreq) < 0)
continue;
mask = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
if ((ipaddr & mask) != (ina & mask))
continue;
break;
}
ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
}
if (ifr >= ifend)
return 0;
syslog(LOG_INFO, "found interface %s for proxy arp", ifr->ifr_name);
/*
* Now scan through again looking for a link-level address
* for this interface.
*/
ifp = ifr;
for (ifr = ifc.ifc_req; ifr < ifend; ) {
if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
&& ifr->ifr_addr.sa_family == AF_LINK) {
/*
* Found the link-level address - copy it out
*/
dla = (struct sockaddr_dl *)&ifr->ifr_addr;
hwaddr->sa_len = sizeof(struct sockaddr);
hwaddr->sa_family = AF_UNSPEC;
BCOPY(LLADDR(dla), hwaddr->sa_data, dla->sdl_alen);
return 1;
}
ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
}
return 0;
}
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