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freebsd-nq/usr.sbin/ppp/tun.c

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Add (BSD) copyright headers.
1997-12-21 12:11:13 +00:00
/*-
* Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
o Redesign the layering mechanism and make the aliasing code part of the layering. We now ``stack'' layers as soon as we open the device (when we figure out what we're dealing with). A static set of `dispatch' routines are also declared for dealing with incoming packets after they've been `pulled' up through the stacked layers. Physical devices are now assigned handlers based on the device type when they're opened. For the moment there are three device types; ttys, execs and tcps. o Increment version number to 2.2 o Make an entry in [uw]tmp for non-tty -direct invocations (after pap/chap authentication). o Make throughput counters quad_t's o Account for the absolute number of mbuf malloc()s and free()s in ``show mem''. o ``show modem'' becomes ``show physical''.
1999-05-08 11:07:56 +00:00
* $Id: tun.c,v 1.13 1999/04/26 08:54:34 brian Exp $
Add id strings to tun.[ch]. Don't try to open ppp.secret if we're never going to use it.
1997-11-17 00:42:41 +00:00
*/
Initial RADIUS support (using libradius). See the man page for details. Compiling with -DNORADIUS (the default for `release') removes support. TODO: The functionality in libradius::rad_send_request() needs to be supplied as a set of routines so that ppp doesn't have to wait indefinitely for the radius server(s). Instead, we need to get a descriptor back, select() on the descriptor, and ask libradius to service it when necessary. For now, ppp blocks SIGALRM while in rad_send_request(), so it misses PAP/CHAP retries & timeouts if they occur. Only PAP is functional. When CHAP is attempted, libradius complains that no User-Password has been specified... rfc2138 says that it *mustn't* be used for CHAP :-( Sponsored by: Internet Business Solutions Ltd., Switzerland
1999-01-28 01:56:34 +00:00
#include <sys/param.h>
Remove redundant includes
1998-06-27 14:18:15 +00:00
#include <sys/socket.h> /* For IFF_ defines */
#include <net/if.h> /* For IFF_ defines */
This commit was manufactured by cvs2svn to create branch 'MP'.
1998-01-29 00:44:16 +00:00
#include <netinet/in.h>
Use IFT_PPP from net/if_types.h rather than hard-coding it.
1998-08-09 16:41:01 +00:00
#include <net/if_types.h>
Abstract data read from and written to the tun device, allowing for a possible header on the front of all packets. In OpenBSD, there's a structure containing the address family here. If we're building under OpenBSD, set up the ``flags'' part of struct tuninfo (not there under FreeBSD) so that we config the interface as POINTOPOINT. Prefix prototypes with ``extern'' in os.c for consistency. These changes are cosmetic under FreeBSD, but allow ppp to build & work under OpenBSD (bar the srandomdev() stuff, the inclusing of <net/if_var.h> and some Makefile symantecs).
1997-11-16 22:15:11 +00:00
#include <net/if_tun.h>
Move VJ compression state and stats into struct ipcp.
1998-03-16 22:54:35 +00:00
#include <netinet/in_systm.h>
#include <netinet/ip.h>
o Add the link name to modem diagnostics. o Create struct mpserver as part of struct mp. mpserver creates a unix-domain socket based on the peers auth name and endpoint discriminator. If it already exists, ppp will ``pass the link'' over to the owner of the socket, joining it into the bundle of another ppp invocation, otherwise ppp waits for other invocations to pass it links through this socket. The final piece of code will be the code that flattens our datalink info and passes it down this channel (not yet implemented).
1998-04-28 01:25:46 +00:00
#include <sys/un.h>
Abstract data read from and written to the tun device, allowing for a possible header on the front of all packets. In OpenBSD, there's a structure containing the address family here. If we're building under OpenBSD, set up the ``flags'' part of struct tuninfo (not there under FreeBSD) so that we config the interface as POINTOPOINT. Prefix prototypes with ``extern'' in os.c for consistency. These changes are cosmetic under FreeBSD, but allow ppp to build & work under OpenBSD (bar the srandomdev() stuff, the inclusing of <net/if_var.h> and some Makefile symantecs).
1997-11-16 22:15:11 +00:00
#include <errno.h>, not <sys/errno.h>
1999-04-26 08:54:25 +00:00
#include <errno.h>
Abstract data read from and written to the tun device, allowing for a possible header on the front of all packets. In OpenBSD, there's a structure containing the address family here. If we're building under OpenBSD, set up the ``flags'' part of struct tuninfo (not there under FreeBSD) so that we config the interface as POINTOPOINT. Prefix prototypes with ``extern'' in os.c for consistency. These changes are cosmetic under FreeBSD, but allow ppp to build & work under OpenBSD (bar the srandomdev() stuff, the inclusing of <net/if_var.h> and some Makefile symantecs).
1997-11-16 22:15:11 +00:00
#include <string.h>
#include <sys/ioctl.h>
o Redesign the layering mechanism and make the aliasing code part of the layering. We now ``stack'' layers as soon as we open the device (when we figure out what we're dealing with). A static set of `dispatch' routines are also declared for dealing with incoming packets after they've been `pulled' up through the stacked layers. Physical devices are now assigned handlers based on the device type when they're opened. For the moment there are three device types; ttys, execs and tcps. o Increment version number to 2.2 o Make an entry in [uw]tmp for non-tty -direct invocations (after pap/chap authentication). o Make throughput counters quad_t's o Account for the absolute number of mbuf malloc()s and free()s in ``show mem''. o ``show modem'' becomes ``show physical''.
1999-05-08 11:07:56 +00:00
#include <termios.h>
Add support for NetBSD
1999-04-26 08:54:34 +00:00
#ifdef __NetBSD__
#include <stdio.h>
#include <unistd.h>
#endif
Abstract data read from and written to the tun device, allowing for a possible header on the front of all packets. In OpenBSD, there's a structure containing the address family here. If we're building under OpenBSD, set up the ``flags'' part of struct tuninfo (not there under FreeBSD) so that we config the interface as POINTOPOINT. Prefix prototypes with ``extern'' in os.c for consistency. These changes are cosmetic under FreeBSD, but allow ppp to build & work under OpenBSD (bar the srandomdev() stuff, the inclusing of <net/if_var.h> and some Makefile symantecs).
1997-11-16 22:15:11 +00:00
o Redesign the layering mechanism and make the aliasing code part of the layering. We now ``stack'' layers as soon as we open the device (when we figure out what we're dealing with). A static set of `dispatch' routines are also declared for dealing with incoming packets after they've been `pulled' up through the stacked layers. Physical devices are now assigned handlers based on the device type when they're opened. For the moment there are three device types; ttys, execs and tcps. o Increment version number to 2.2 o Make an entry in [uw]tmp for non-tty -direct invocations (after pap/chap authentication). o Make throughput counters quad_t's o Account for the absolute number of mbuf malloc()s and free()s in ``show mem''. o ``show modem'' becomes ``show physical''.
1999-05-08 11:07:56 +00:00
#include "layer.h"
Fix prototypes. Remove extraneous decls. Add ``const'' to several places. Allow ``make NOALIAS=1'' to remove IP aliasing. Merge with OpenBSD - only the Makefiles vary. We can now survive a compile with -Wall -Wbad-function-cast -Wcast-align -Wcast-qual -Winline -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wpointer-arith -Wredundant-decls -Wshadow -Wstrict-prototypes -Wwrite-strings -Wchar-subscripts (although the Makefile just contains -Wall).
1997-11-22 03:37:54 +00:00
#include "mbuf.h"
#include "log.h"
o Create `struct hdlc' - a part of struct physical. o Move our LCP report timer into struct hdlc - it's really a hdlc timer (fcs errors etc). o Make `show hdlc' require context and make the output more friendly. o Remove all non-const globals from hdlc.c o Output peer-rejected protocols by name - not just ones that we reject.
1998-02-18 19:35:59 +00:00
#include "timer.h"
De-staticise LQR information Increment OutPackets for any packet - not just LQRs MFC: o Fix a few comment typos. o Fix ``set timeout'' usage message and documentation. o Change ifOutPackets, ifOutOctets and ifOutLQRs to `u_int32_t's so that they wrap correctly. o Put the LQR in network byte order using the correct struct size (sizeof u_int32_t, not sizeof u_long). o Wrap LQR ECHO counters correctly. o Don't increment OutLQR count if the last LQR hasn't been replied to. o Initialise last received LQR in StartLqm. o Don't start the LQR timer if we're `disabled' and `accepted'. o Generate LQR responses when both sides are using a timer and we're not going to send our next LQR before the peers max timeout.
1998-03-13 00:44:26 +00:00
#include "lqr.h"
Abstract data read from and written to the tun device, allowing for a possible header on the front of all packets. In OpenBSD, there's a structure containing the address family here. If we're building under OpenBSD, set up the ``flags'' part of struct tuninfo (not there under FreeBSD) so that we config the interface as POINTOPOINT. Prefix prototypes with ``extern'' in os.c for consistency. These changes are cosmetic under FreeBSD, but allow ppp to build & work under OpenBSD (bar the srandomdev() stuff, the inclusing of <net/if_var.h> and some Makefile symantecs).
1997-11-16 22:15:11 +00:00
#include "hdlc.h"
#include "defs.h"
Create struct fsm_parent. FSMs are created with one of these, and the FSM passes subsequent events to them. The datalink now hides its CCP from the bundle layer.
1998-02-27 01:22:39 +00:00
#include "fsm.h"
Move the IPCP into struct bundle.
1998-03-13 21:07:46 +00:00
#include "throughput.h"
#include "iplist.h"
Move VJ compression state and stats into struct ipcp.
1998-03-16 22:54:35 +00:00
#include "slcompress.h"
Move the IPCP into struct bundle.
1998-03-13 21:07:46 +00:00
#include "ipcp.h"
Move filter sets into struct bundle.
1998-03-16 22:52:54 +00:00
#include "filter.h"
Make struct bundle into a sort of `struct descriptor'. It does the fdsets/reads/writes for each of it's datalinks.
1998-03-20 19:48:28 +00:00
#include "descriptor.h"
o Move struct lcp and struct ccp into struct link. o Remove bundle2lcp(), bundle2ccp() and bundle2link(). They're too resource-hungry and we have `owner pointers' to do their job. o Make our FSM understand LCPs that are always ST_OPENED (with a minimum code that != 1). o Send FSM code rejects for invalid codes. o Make our bundle fsm_parent deal with multiple links. o Make timer diagnostics pretty and allow access via ~t in `term' mode (not just when logging debug) and `show timers'. Only show timers every second in debug mode, otherwise we get too many diagnostics to be useful (we probably still do). Also, don't restrict ~m in term mode to depend on debug logging. o Rationalise our bundles' phases. o Create struct mp (multilink protocol). This is both an NCP and a type of struct link. It feeds off other NCPs for output, passing fragmented packets into the queues of available datalinks. It also gets PROTO_MP input, reassembles the fragments into ppp frames, and passes them back to the HDLC layer that the fragments were passed from. ** It's not yet possible to enter multilink mode :-( ** o Add `set weight' (requires context) for deciding on a links weighting in multilink mode. Weighting is simplistic (and probably badly implemented) for now. o Remove the function pointers in struct link. They ended up only applying to physical links. o Configure our tun device with an MTU equal to the MRU from struct mp's LCP and a speed equal to the sum of our link speeds. o `show {lcp,ccp,proto}' and `set deflate' now have optional context and use ChooseLink() to decide on which `struct link' to use. This allows behaviour as before when in non-multilink mode, and allows access to the MP logical link in multilink mode. o Ignore reconnect and redial values when in -direct mode and when cleaning up. Always redial when in -ddial or -dedicated mode (unless cleaning up). o Tell our links to `staydown' when we close them due to a signal. o Remove remaining `#ifdef SIGALRM's (ppp doesn't function without alarms). o Don't bother strdup()ing our physical link name. o Various other cosmetic changes.
1998-04-03 19:21:56 +00:00
#include "lcp.h"
#include "ccp.h"
#include "link.h"
#include "mp.h"
Initial RADIUS support (using libradius). See the man page for details. Compiling with -DNORADIUS (the default for `release') removes support. TODO: The functionality in libradius::rad_send_request() needs to be supplied as a set of routines so that ppp doesn't have to wait indefinitely for the radius server(s). Instead, we need to get a descriptor back, select() on the descriptor, and ask libradius to service it when necessary. For now, ppp blocks SIGALRM while in rad_send_request(), so it misses PAP/CHAP retries & timeouts if they occur. Only PAP is functional. When CHAP is attempted, libradius complains that no User-Password has been specified... rfc2138 says that it *mustn't* be used for CHAP :-( Sponsored by: Internet Business Solutions Ltd., Switzerland
1999-01-28 01:56:34 +00:00
#ifndef NORADIUS
#include "radius.h"
#endif
Create `struct bundle' - the top level control structure. This structure will eventually contain a list of NCPs (currently only IPCP is supported) and a list of physical `struct link's. It will also derive from a struct link itself. Make ModemTimeout() static - it's way to dangerous to be called from outside ! Bump version to 1.9. Our first MP release should be 2.0.
1998-02-02 19:32:16 +00:00
#include "bundle.h"
Abstract data read from and written to the tun device, allowing for a possible header on the front of all packets. In OpenBSD, there's a structure containing the address family here. If we're building under OpenBSD, set up the ``flags'' part of struct tuninfo (not there under FreeBSD) so that we config the interface as POINTOPOINT. Prefix prototypes with ``extern'' in os.c for consistency. These changes are cosmetic under FreeBSD, but allow ppp to build & work under OpenBSD (bar the srandomdev() stuff, the inclusing of <net/if_var.h> and some Makefile symantecs).
1997-11-16 22:15:11 +00:00
#include "tun.h"
void
Categorize the fields in struct bundle, and make the tunnel device speed available in ``show bundle''.
1998-05-06 23:50:25 +00:00
tun_configure(struct bundle *bundle, int mtu)
Abstract data read from and written to the tun device, allowing for a possible header on the front of all packets. In OpenBSD, there's a structure containing the address family here. If we're building under OpenBSD, set up the ``flags'' part of struct tuninfo (not there under FreeBSD) so that we config the interface as POINTOPOINT. Prefix prototypes with ``extern'' in os.c for consistency. These changes are cosmetic under FreeBSD, but allow ppp to build & work under OpenBSD (bar the srandomdev() stuff, the inclusing of <net/if_var.h> and some Makefile symantecs).
1997-11-16 22:15:11 +00:00
{
Add support for NetBSD
1999-04-26 08:54:34 +00:00
#ifdef __NetBSD__
struct ifreq ifr;
int s;
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0) {
log_Printf(LogERROR, "tun_configure: socket(): %s\n", strerror(errno));
return;
}
sprintf(ifr.ifr_name, "tun%d", bundle->unit);
ifr.ifr_mtu = mtu;
if (ioctl(s, SIOCSIFMTU, &ifr) < 0)
log_Printf(LogERROR, "tun_configure: ioctl(SIOCSIFMTU): %s\n",
strerror(errno));
close(s);
#else
Abstract data read from and written to the tun device, allowing for a possible header on the front of all packets. In OpenBSD, there's a structure containing the address family here. If we're building under OpenBSD, set up the ``flags'' part of struct tuninfo (not there under FreeBSD) so that we config the interface as POINTOPOINT. Prefix prototypes with ``extern'' in os.c for consistency. These changes are cosmetic under FreeBSD, but allow ppp to build & work under OpenBSD (bar the srandomdev() stuff, the inclusing of <net/if_var.h> and some Makefile symantecs).
1997-11-16 22:15:11 +00:00
struct tuninfo info;
Solve the ``first connection'' problem that occurs on demand-dial links with dynamic IP numbers where the program that causes the dial bind()s to an interface address that is subsequently changed after ppp negotiation. The problem is defeated by adding negotiated addresses to the tun interface as additional alias addresses and providing a set of ``iface'' commands for managing the interface. Libalias is also required (and what a name clash!) - it happily IP-aliases the address so that the source is that of the primary (negotiated) interface and un-IP-aliases it on the way back. An ``enable iface-alias'' is done implicitly by the -alias command line switch. If -alias isn't given, iface-aliasing is disabled by default and can't be enabled 'till an ``alias enable yes'' is done. ``alias enable no'' silently disables iface-alias. So, for dynamic-IP-type-connections, running ``ppp -alias -auto blah'' will work for the first connection, although existing bindings will not survive a disconnect/connect as the TCP peer will be trying to send to the old IP address - the packets won't route. It's now a lot easier to add IPXCP to ppp with minor updates to the new iface.[ch] (if anyone ever gets 'round to it). It's also now possible to manually add interface aliases with something like ``iface add 1.2.3.4/24 5.6.7.8''. This allows multi-homed ppp links :-)
1998-10-22 02:32:50 +00:00
memset(&info, '\0', sizeof info);
Use IFT_PPP from net/if_types.h rather than hard-coding it.
1998-08-09 16:41:01 +00:00
info.type = IFT_PPP;
Initial RADIUS support (using libradius). See the man page for details. Compiling with -DNORADIUS (the default for `release') removes support. TODO: The functionality in libradius::rad_send_request() needs to be supplied as a set of routines so that ppp doesn't have to wait indefinitely for the radius server(s). Instead, we need to get a descriptor back, select() on the descriptor, and ask libradius to service it when necessary. For now, ppp blocks SIGALRM while in rad_send_request(), so it misses PAP/CHAP retries & timeouts if they occur. Only PAP is functional. When CHAP is attempted, libradius complains that no User-Password has been specified... rfc2138 says that it *mustn't* be used for CHAP :-( Sponsored by: Internet Business Solutions Ltd., Switzerland
1999-01-28 01:56:34 +00:00
#ifndef NORADIUS
if (bundle->radius.valid && bundle->radius.mtu && bundle->radius.mtu < mtu) {
log_Printf(LogLCP, "Reducing MTU to radius value %lu\n",
bundle->radius.mtu);
info.mtu = bundle->radius.mtu;
} else
#endif
info.mtu = mtu;
Solve the ``first connection'' problem that occurs on demand-dial links with dynamic IP numbers where the program that causes the dial bind()s to an interface address that is subsequently changed after ppp negotiation. The problem is defeated by adding negotiated addresses to the tun interface as additional alias addresses and providing a set of ``iface'' commands for managing the interface. Libalias is also required (and what a name clash!) - it happily IP-aliases the address so that the source is that of the primary (negotiated) interface and un-IP-aliases it on the way back. An ``enable iface-alias'' is done implicitly by the -alias command line switch. If -alias isn't given, iface-aliasing is disabled by default and can't be enabled 'till an ``alias enable yes'' is done. ``alias enable no'' silently disables iface-alias. So, for dynamic-IP-type-connections, running ``ppp -alias -auto blah'' will work for the first connection, although existing bindings will not survive a disconnect/connect as the TCP peer will be trying to send to the old IP address - the packets won't route. It's now a lot easier to add IPXCP to ppp with minor updates to the new iface.[ch] (if anyone ever gets 'round to it). It's also now possible to manually add interface aliases with something like ``iface add 1.2.3.4/24 5.6.7.8''. This allows multi-homed ppp links :-)
1998-10-22 02:32:50 +00:00
info.baudrate = bundle->ifSpeed;
Abstract data read from and written to the tun device, allowing for a possible header on the front of all packets. In OpenBSD, there's a structure containing the address family here. If we're building under OpenBSD, set up the ``flags'' part of struct tuninfo (not there under FreeBSD) so that we config the interface as POINTOPOINT. Prefix prototypes with ``extern'' in os.c for consistency. These changes are cosmetic under FreeBSD, but allow ppp to build & work under OpenBSD (bar the srandomdev() stuff, the inclusing of <net/if_var.h> and some Makefile symantecs).
1997-11-16 22:15:11 +00:00
#ifdef __OpenBSD__
info.flags = IFF_UP|IFF_POINTOPOINT;
#endif
Categorize the fields in struct bundle, and make the tunnel device speed available in ``show bundle''.
1998-05-06 23:50:25 +00:00
if (ioctl(bundle->dev.fd, TUNSIFINFO, &info) < 0)
Cosmetic: Make our external function names consistent.
1998-05-01 19:26:12 +00:00
log_Printf(LogERROR, "tun_configure: ioctl(TUNSIFINFO): %s\n",
Abstract data read from and written to the tun device, allowing for a possible header on the front of all packets. In OpenBSD, there's a structure containing the address family here. If we're building under OpenBSD, set up the ``flags'' part of struct tuninfo (not there under FreeBSD) so that we config the interface as POINTOPOINT. Prefix prototypes with ``extern'' in os.c for consistency. These changes are cosmetic under FreeBSD, but allow ppp to build & work under OpenBSD (bar the srandomdev() stuff, the inclusing of <net/if_var.h> and some Makefile symantecs).
1997-11-16 22:15:11 +00:00
strerror(errno));
Add support for NetBSD
1999-04-26 08:54:34 +00:00
#endif
Abstract data read from and written to the tun device, allowing for a possible header on the front of all packets. In OpenBSD, there's a structure containing the address family here. If we're building under OpenBSD, set up the ``flags'' part of struct tuninfo (not there under FreeBSD) so that we config the interface as POINTOPOINT. Prefix prototypes with ``extern'' in os.c for consistency. These changes are cosmetic under FreeBSD, but allow ppp to build & work under OpenBSD (bar the srandomdev() stuff, the inclusing of <net/if_var.h> and some Makefile symantecs).
1997-11-16 22:15:11 +00:00
}
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