606 lines
17 KiB
C
606 lines
17 KiB
C
/* UNFINISHED CONVERSION TO 386BSD -wfj */
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/* if_tun.c - tunnel interface module & driver */
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/*
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* Copyright (c) 1988, Julian Onions.
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*
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* This source may be freely distributed, however I would be interested
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* in any changes that are made.
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*/
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/*
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* 90/02/06 15:03 - Fixed a bug in where TIOCGPGRP and TIOCSPGRP were
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* mixed up. Anders Klemets - klemets@sics.se
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*
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* $Id: if_tun.c,v 1.3 1993/05/22 11:42:13 cgd Exp $
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*
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* $Log: if_tun.c,v $
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* Revision 1.3 1993/05/22 11:42:13 cgd
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* add include of select.h if necessary for protos, or delete if extraneous
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*
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* Revision 1.2 1993/05/18 18:19:58 cgd
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* make kernel select interface be one-stop shopping & clean it all up.
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*
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* Revision 1.1.1.1 1993/03/21 09:46:06 cgd
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* initial import of 386bsd-0.1 sources
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*
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* Revision 1.13 88/07/11 08:28:51 jpo
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* Some tidying up
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*
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* Revision 1.12 87/12/10 09:16:29 jpo
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* Decided the vax/mtpr was unnecessay.
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*
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* Revision 1.11 87/12/10 09:10:36 jpo
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* Fixed some minor things & 1 major bug.
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*
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* Revision 1.10 87/11/04 14:27:41 jpo
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* A few sanity checks added.
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*
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* Revision 1.9 87/11/04 14:13:45 jpo
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* Added some ioctls for non-blocking & async I/O
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*
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* Revision 1.8 87/10/19 10:28:14 jpo
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* Another touch up (sigh)
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*
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* Revision 1.7 87/10/19 10:25:48 jpo
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* Touch up.
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*
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* Revision 1.6 87/10/19 09:15:14 jpo
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* Touch up.
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*
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* Revision 1.5 87/10/19 08:34:51 jpo
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* General clean up - plus sun specific fixes
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*
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* Revision 1.4 87/10/16 17:10:12 jpo
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* Purged all ioctl read/writes and non-standard routing stuff.
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*
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* Revision 1.3 87/10/05 11:57:09 jpo
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* More debugging - in error mainly.
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*
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* Revision 1.2 87/10/04 18:29:45 jpo
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* Select & read/write working.
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*/
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#include "tun.h"
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#if NTUN > 0
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/*
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* Tunnel driver.
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*
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* This driver takes packets off the IP i/f and hands them up to a
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* user process to have it's wicked way with. This driver has it's
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* roots in a similar driver written by Phil Cockcroft (formerly) at
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* UCL. This driver is based much more on read/write/select mode of
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* operation though.
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*
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* Julian Onions <jpo@cs.nott.ac.uk>
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* Nottingham University 1987.
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*/
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#include "param.h"
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#include "systm.h"
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#include "mbuf.h"
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#include "buf.h"
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#include "protosw.h"
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#include "socket.h"
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#include "ioctl.h"
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#include "errno.h"
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#include "syslog.h"
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#include "select.h"
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#include "net/if.h"
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#include "net/netisr.h"
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#include "net/route.h"
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#ifdef INET
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#include "netinet/in.h"
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#include "netinet/in_systm.h"
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#include "netinet/in_var.h"
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#include "netinet/ip.h"
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#include "netinet/if_ether.h"
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#endif
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#ifdef NS
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#include "netns/ns.h"
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#include "netns/ns_if.h"
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#endif
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#define TUNDEBUG if (tundebug) printf
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int tundebug = 0;
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struct tunctl
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{
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u_short tun_flags; /* misc flags */
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struct ifnet tun_if; /* the interface */
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int tun_pgrp; /* the process group - if any */
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struct selinfo tun_rsel; /* read select */
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struct selinfo tun_wsel; /* write select (not used) */
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} tunctl[NTUN];
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extern int ifqmaxlen;
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int tunoutput (), tunioctl (), tuninit ();
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/* tunnel open - must be superuser & the device must be configured in */
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tunopen (dev, flag)
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dev_t dev;
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{
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register int unit;
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struct tunctl *tp;
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register struct ifnet *ifp;
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if (!suser ())
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return EACCES;
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if ((unit = minor (dev)) >= NTUN)
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return (ENXIO);
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tp = &tunctl[unit];
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if (tp->tun_flags & TUN_OPEN)
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return ENXIO;
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if ((tp->tun_flags & TUN_INITED) == 0) {
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tp->tun_flags = TUN_INITED;
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tunattach (unit);
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}
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ifp = &tp->tun_if;
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tp->tun_flags |= TUN_OPEN;
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TUNDEBUG ("%s%d: open\n", ifp->if_name, ifp->if_unit);
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return (0);
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}
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/* tunclose - close the device - mark i/f down & delete routing info */
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tunclose (dev, flag)
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dev_t dev;
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{
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int s;
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register int unit = minor (dev);
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register struct tunctl *tp = &tunctl[unit];
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register struct ifnet *ifp = &tp->tun_if;
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register struct mbuf *m;
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tp->tun_flags &= TUN_INITED;
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/*
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* junk all pending output
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*/
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do {
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s = splimp ();
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IF_DEQUEUE (&ifp->if_snd, m);
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splx (s);
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if (m) /* actually - m_freem checks this - but what the hell */
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m_freem (m);
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} while (m != 0);
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if (ifp->if_flags & IFF_UP) {
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s = splimp ();
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if_down (ifp);
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if (ifp->if_flags & IFF_RUNNING)
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rtinit (ifp->if_addrlist, (int)SIOCDELRT, RTF_HOST);
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splx (s);
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}
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tp -> tun_pgrp = 0;
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if (tp -> tun_rsel)
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selwakeup (&tp->tun_rsel);
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tp -> tun_rsel = tp -> tun_wsel = (struct proc *)0;
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TUNDEBUG ("%s%d: closed\n", ifp->if_name, ifp->if_unit);
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return (0);
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}
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/*
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* attach an interface N.B. argument is not same as other drivers
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*/
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int
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tunattach (unit)
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int unit;
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{
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register struct ifnet *ifp = &tunctl[unit].tun_if;
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register struct sockaddr_in *sin;
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ifp->if_unit = unit;
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ifp->if_name = "tun";
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ifp->if_mtu = TUNMTU;
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ifp->if_ioctl = tunioctl;
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ifp->if_output = tunoutput;
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ifp->if_init = tuninit;
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#ifndef BSD4_3
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sin = (struct sockaddr_in *) & ifp->if_addr;
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sin->sin_family = AF_INET;
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#endif
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ifp->if_flags = IFF_POINTOPOINT;
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ifp->if_snd.ifq_maxlen = ifqmaxlen;
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ifp->if_collisions = ifp->if_ierrors = ifp->if_oerrors = 0;
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ifp->if_ipackets = ifp->if_opackets = 0;
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if_attach (ifp);
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TUNDEBUG ("%s%d: tunattach\n", ifp->if_name, ifp->if_unit);
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return 0;
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}
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int
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tuninit (unit)
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int unit;
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{
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register struct tunctl *tp = &tunctl[unit];
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register struct ifnet *ifp = &tp->tun_if;
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#ifndef BSD4_3
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register struct sockaddr_in *sin;
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sin = (struct sockaddr_in *) & ifp->if_addr;
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if (sin->sin_addr.s_addr == 0) /* if address still unknown */
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return;
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if_rtinit (ifp, RTF_UP);
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#endif
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ifp->if_flags |= IFF_UP | IFF_RUNNING;
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tp->tun_flags |= TUN_IASET;
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TUNDEBUG ("%s%d: tuninit\n", ifp->if_name, ifp->if_unit);
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return 0;
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}
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/*
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* Process an ioctl request.
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* The problem here is 4.2 pass a struct ifreq * to this routine,
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* sun only passes a struct sockaddr * since 3.2 at least. This is
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* rather upsetting! Also, sun doesn't pass the SIOCDSTADDR ioctl through
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* so we can't detect this being set directly. This is the reason for
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* tuncheckready.
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* Under 4.3 and SunOs 4.0 we now get the SIOCSIFDSTADDR ioctl, and we get a
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* struct in_ifaddr * for data. (tte)
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*/
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#if !defined(BSD4_3) && defined(sun)
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/*
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* workaround for not being able to detect DSTADDR being set.
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*/
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tuncheckready (ifp)
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struct ifnet *ifp;
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{
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struct tunctl *tp = &tunctl[ifp->if_unit];
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struct sockaddr_in *sin;
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sin = (struct sockaddr_in *) &ifp->if_dstaddr;
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if (sin->sin_addr.s_addr == 0)
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return 0;
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tp -> tun_flags |= TUN_DSTADDR;
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return 1;
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}
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#else
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#define tuncheckready(dummy) 1
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#endif /* !defined(BSD4_3) && defined(sun) */
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int
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tunioctl (ifp, cmd, data)
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register struct ifnet *ifp;
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int cmd;
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caddr_t data;
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{
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#ifndef BSD4_3
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#ifdef sun
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struct sockaddr_in *sin = (struct sockaddr_in *) data;
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#else
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struct sockaddr_in *sin;
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struct ifreq *ifr = (struct ifreq *) data;
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#endif
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#endif /* BSD4_3 */
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int s = splimp (), error = 0;
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struct tunctl *tp = &tunctl[ifp->if_unit];
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switch (cmd)
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{
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case SIOCSIFADDR:
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#ifndef BSD4_3
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if (ifp->if_flags & IFF_RUNNING)
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if_rtinit (ifp, -1); /* delete previous route */
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#ifndef sun
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sin = (struct sockaddr_in *)&ifr -> ifr_addr;
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#endif
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ifp->if_addr = *((struct sockaddr *) sin);
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ifp->if_net = in_netof (sin->sin_addr);
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ifp->if_host[0] = in_lnaof (sin->sin_addr);
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#endif
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tuninit (ifp->if_unit);
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break;
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case SIOCSIFDSTADDR:
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tp->tun_flags |= TUN_DSTADDR;
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#ifndef BSD4_3
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#ifndef sun
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sin = (struct sockaddr_in *)&ifr -> ifr_addr;
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#endif
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ifp->if_dstaddr = *((struct sockaddr *)sin);
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#endif BSD4_3
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TUNDEBUG ("%s%d: destination addres set\n", ifp->if_name,
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ifp -> if_unit);
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break;
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default:
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error = EINVAL;
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}
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splx (s);
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return (error);
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}
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/*
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* tunoutput - queue packets from higher level ready to put out.
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*/
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tunoutput (ifp, m0, dst)
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struct ifnet *ifp;
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struct mbuf *m0;
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struct sockaddr *dst;
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{
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struct tunctl *tp;
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struct proc *p;
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int s;
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TUNDEBUG ("%s%d: tunoutput\n", ifp->if_name, ifp->if_unit);
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tp = &tunctl[ifp->if_unit];
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if ((tp->tun_flags & TUN_READY) != TUN_READY) {
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if(tuncheckready(ifp) == 0) {
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TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name,
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ifp->if_unit, tp->tun_flags);
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m_freem (m0);
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return EHOSTDOWN;
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}
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}
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switch (dst->sa_family) {
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#ifdef INET
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case AF_INET:
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s = splimp ();
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if (IF_QFULL (&ifp->if_snd))
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{
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IF_DROP (&ifp->if_snd);
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m_freem (m0);
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splx (s);
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ifp->if_collisions++;
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return (ENOBUFS);
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}
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IF_ENQUEUE (&ifp->if_snd, m0);
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splx (s);
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ifp->if_opackets++;
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break;
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#endif
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default:
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m_freem (m0);
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return EAFNOSUPPORT;
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}
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if (tp->tun_flags & TUN_RWAIT) {
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tp->tun_flags &= ~TUN_RWAIT;
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wakeup ((caddr_t) tp);
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}
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if (tp->tun_flags & TUN_ASYNC && tp -> tun_pgrp != 0) {
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if (tp->tun_pgrp > 0)
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gsignal (tp->tun_pgrp, SIGIO);
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else if ((p = pfind (-tp->tun_pgrp)) != 0)
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psignal (p, SIGIO);
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}
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selwakeup (&tp->tun_rsel);
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return 0;
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}
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/*
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* the cdevsw interface is now pretty minimal.
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*/
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tuncioctl (dev, cmd, data, flag)
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dev_t dev;
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caddr_t data;
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{
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int unit = minor(dev);
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struct tunctl *tp = &tunctl[unit];
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int s;
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switch (cmd) {
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case TUNSDEBUG:
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tundebug = *(int *)data;
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break;
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case TUNGDEBUG:
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*(int *)data = tundebug;
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break;
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case FIONBIO:
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if (*(int *)data)
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tp->tun_flags |= TUN_NBIO;
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else
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tp->tun_flags &= ~TUN_NBIO;
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break;
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case FIOASYNC:
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if (*(int *)data)
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tp->tun_flags |= TUN_ASYNC;
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else
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tp->tun_flags &= ~TUN_ASYNC;
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break;
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case FIONREAD:
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s = splimp ();
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if (tp->tun_if.if_snd.ifq_head)
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*(int *)data = tp->tun_if.if_snd.ifq_head->m_len;
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else *(int *)data = 0;
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splx (s);
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break;
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case TIOCSPGRP:
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tp->tun_pgrp = *(int *)data;
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break;
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case TIOCGPGRP:
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*(int *)data = tp->tun_pgrp;
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break;
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default:
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return (ENOTTY);
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}
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return (0);
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}
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/*
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* The cdevsw read interface - reads a packet at a time, or at least as much
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* of a packet as can be read.
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*/
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tunread (dev, uio)
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dev_t dev;
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struct uio *uio;
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{
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register struct ifnet *ifp;
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register struct mbuf *m, *m0;
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int unit = minor (dev);
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int len, s;
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int error = 0;
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struct tunctl *tp;
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tp = &tunctl[unit];
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ifp = &tp->tun_if;
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TUNDEBUG ("%s%d: read\n", ifp->if_name, ifp->if_unit);
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if ((tp->tun_flags & TUN_READY) != TUN_READY) {
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if(tuncheckready(ifp) == 0) {
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TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name,
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ifp->if_unit, tp->tun_flags);
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return EHOSTDOWN;
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}
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}
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tp->tun_flags &= ~TUN_RWAIT;
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s = splimp ();
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do {
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IF_DEQUEUE (&ifp->if_snd, m0);
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if (m0 == 0) {
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if (tp -> tun_flags & TUN_NBIO) {
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splx (s);
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return EWOULDBLOCK;
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}
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tp->tun_flags |= TUN_RWAIT;
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sleep ((caddr_t) tp, PZERO + 1);
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}
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} while (m0 == 0);
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splx (s);
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while (m0 && uio->uio_resid > 0 && error == 0) {
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len = MIN (uio->uio_resid, m0->m_len);
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if (len == 0)
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break;
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error = uiomove (mtod (m0, caddr_t), len,
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UIO_READ, uio);
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MFREE (m0, m);
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m0 = m;
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}
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if (m0 != 0) {
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TUNDEBUG ("Dropping mbuf\n");
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m_freem (m0);
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}
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return error;
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}
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/*
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* the cdevsw write interface - an atomic write is a packet - or else!
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*/
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tunwrite (dev, uio)
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int dev;
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struct uio *uio;
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{
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int error = 0;
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int unit = minor (dev);
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struct mbuf *top, **mp, *m;
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struct ifnet *ifp = &(tunctl[unit].tun_if);
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int s;
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TUNDEBUG ("%s%d: tunwrite\n", ifp->if_name, ifp->if_unit);
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if (uio->uio_resid < 0 || uio->uio_resid > TUNMTU) {
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TUNDEBUG ("%s%d: len=%d!\n", ifp->if_name, ifp->if_unit,
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uio->uio_resid);
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return EIO;
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}
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top = 0;
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mp = ⊤
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while (error == 0 && uio->uio_resid > 0) {
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MGET (m, M_DONTWAIT, MT_DATA);
|
|
if (m == 0) {
|
|
error = ENOBUFS;
|
|
break;
|
|
}
|
|
m->m_len = MIN (MLEN, uio->uio_resid);
|
|
error = uiomove (mtod (m, caddr_t), m->m_len, UIO_WRITE, uio);
|
|
*mp = m;
|
|
mp = &m->m_next;
|
|
}
|
|
if (error) {
|
|
if (top)
|
|
m_freem (top);
|
|
return error;
|
|
}
|
|
|
|
#ifdef BSD4_3
|
|
/*
|
|
* Place interface pointer before the data
|
|
* for the receiving protocol.
|
|
*/
|
|
if (top->m_off <= MMAXOFF &&
|
|
top->m_off >= MMINOFF + sizeof(struct ifnet *)) {
|
|
top->m_off -= sizeof(struct ifnet *);
|
|
top->m_len += sizeof(struct ifnet *);
|
|
} else {
|
|
MGET(m, M_DONTWAIT, MT_HEADER);
|
|
if (m == (struct mbuf *)0)
|
|
return (ENOBUFS);
|
|
m->m_len = sizeof(struct ifnet *);
|
|
m->m_next = top;
|
|
top = m;
|
|
}
|
|
*(mtod(top, struct ifnet **)) = ifp;
|
|
#endif /* BSD4_3 */
|
|
|
|
s = splimp ();
|
|
if (IF_QFULL (&ipintrq)) {
|
|
IF_DROP (&ipintrq);
|
|
splx (s);
|
|
ifp->if_collisions++;
|
|
m_freem (top);
|
|
return ENOBUFS;
|
|
}
|
|
IF_ENQUEUE (&ipintrq, top);
|
|
splx (s);
|
|
ifp->if_ipackets++;
|
|
schednetisr (NETISR_IP);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* tunselect - the select interface, this is only useful on reads really.
|
|
* The write detect always returns true, write never blocks anyway, it either
|
|
* accepts the packet or drops it.
|
|
*/
|
|
tunselect (dev, rw)
|
|
dev_t dev;
|
|
int rw;
|
|
{
|
|
int unit = minor (dev);
|
|
register struct tunctl *tp = &tunctl[unit];
|
|
struct ifnet *ifp = &tp->tun_if;
|
|
int s = splimp ();
|
|
|
|
TUNDEBUG ("%s%d: tunselect\n", ifp->if_name, ifp->if_unit);
|
|
switch (rw) {
|
|
case FREAD:
|
|
if (ifp->if_snd.ifq_len > 0) {
|
|
splx (s);
|
|
TUNDEBUG ("%s%d: tunselect q=%d\n", ifp->if_name,
|
|
ifp->if_unit, ifp->if_snd.ifq_len);
|
|
return 1;
|
|
}
|
|
selrecord(p, &tp->tun_rsel);
|
|
break;
|
|
case FWRITE:
|
|
splx (s);
|
|
return 1;
|
|
}
|
|
splx (s);
|
|
TUNDEBUG ("%s%d: tunselect waiting\n", ifp->if_name, ifp->if_unit);
|
|
return 0;
|
|
}
|
|
#endif NTUN
|