FreeBSD/Linux Kernel Cross Reference
sys/net/if_ppp.c

     /*      $NetBSD: if_ppp.c,v 1.111 2006/11/16 01:33:40 christos Exp $    */
     /*      Id: if_ppp.c,v 1.6 1997/03/04 03:33:00 paulus Exp       */
     
     /*
      * if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver.
      *
      * 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.
     *
     * Based on:
     *      @(#)if_sl.c     7.6.1.2 (Berkeley) 2/15/89
     *
     * Copyright (c) 1987 Regents of the University of California.
     * 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 the University of California, Berkeley.  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.
     *
     * Serial Line interface
     *
     * Rick Adams
     * Center for Seismic Studies
     * 1300 N 17th Street, Suite 1450
     * Arlington, Virginia 22209
     * (703)276-7900
     * rick@seismo.ARPA
     * seismo!rick
     *
     * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris).
     * Converted to 4.3BSD Beta by Chris Torek.
     * Other changes made at Berkeley, based in part on code by Kirk Smith.
     *
     * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com)
     * Added VJ tcp header compression; more unified ioctls
     *
     * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au).
     * Cleaned up a lot of the mbuf-related code to fix bugs that
     * caused system crashes and packet corruption.  Changed pppstart
     * so that it doesn't just give up with a collision if the whole
     * packet doesn't fit in the output ring buffer.
     *
     * Added priority queueing for interactive IP packets, following
     * the model of if_sl.c, plus hooks for bpf.
     * Paul Mackerras (paulus@cs.anu.edu.au).
     */
    
    /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
    /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */
    
    /*
     * XXX IMP ME HARDER
     *
     * This is an explanation of that comment.  This code used to use
     * splimp() to block both network and tty interrupts.  However,
     * that call is deprecated.  So, we have replaced the uses of
    * splimp() with splhigh() in order to applomplish what it needs
    * to accomplish, and added that happy little comment.
    */
   
   #include <sys/cdefs.h>
   __KERNEL_RCSID(0, "$NetBSD: if_ppp.c,v 1.111 2006/11/16 01:33:40 christos Exp $");
   
   #include "ppp.h"
   
   #include "opt_inet.h"
   #include "opt_gateway.h"
   #include "opt_ppp.h"
   
   #ifdef INET
   #define VJC
   #endif
   #define PPP_COMPRESS
   
   #include <sys/param.h>
   #include <sys/proc.h>
   #include <sys/mbuf.h>
   #include <sys/socket.h>
   #include <sys/ioctl.h>
   #include <sys/kernel.h>
   #include <sys/systm.h>
   #include <sys/time.h>
   #include <sys/malloc.h>
   #include <sys/conf.h>
   #include <sys/kauth.h>
   
   #include <net/if.h>
   #include <net/if_types.h>
   #include <net/netisr.h>
   #include <net/route.h>
   #ifdef PPP_FILTER
   #include <net/bpf.h>
   #endif
   
   #include <machine/intr.h>
   
   #include <netinet/in.h>
   #include <netinet/in_systm.h>
   #include <netinet/in_var.h>
   #ifdef INET
   #include <netinet/ip.h>
   #endif
   
   #include "bpfilter.h"
   #if NBPFILTER > 0
   #include <net/bpf.h>
   #endif
   
   #if defined(PPP_FILTER) || NBPFILTER > 0
   #include <net/slip.h>
   #endif
   
   #ifdef VJC
   #include <net/slcompress.h>
   #endif
   
   #include <net/ppp_defs.h>
   #include <net/if_ppp.h>
   #include <net/if_pppvar.h>
   #include <machine/cpu.h>
   
   #ifdef PPP_COMPRESS
   #define PACKETPTR       struct mbuf *
   #include <net/ppp-comp.h>
   #endif
   
   static int      pppsioctl(struct ifnet *, u_long, caddr_t);
   static void     ppp_requeue(struct ppp_softc *);
   static void     ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd);
   static void     ppp_ccp_closed(struct ppp_softc *);
   static void     ppp_inproc(struct ppp_softc *, struct mbuf *);
   static void     pppdumpm(struct mbuf *m0);
   #ifdef ALTQ
   static void     ppp_ifstart(struct ifnet *ifp);
   #endif
   
   #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS
   void            pppnetisr(void);
   #endif
   static void     pppintr(void *);
   
   /*
    * Some useful mbuf macros not in mbuf.h.
    */
   #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT)
   
   #define M_DATASTART(m)  \
           (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \
               (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat)
   
   #define M_DATASIZE(m)   \
           (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \
               (m)->m_flags & M_PKTHDR ? MHLEN: MLEN)
   
   /*
    * We define two link layer specific mbuf flags, to mark high-priority
    * packets for output, and received packets following lost/corrupted
    * packets.
    */
   #define M_HIGHPRI       M_LINK0 /* output packet for sc_fastq */
   #define M_ERRMARK       M_LINK1 /* rx packet following lost/corrupted pkt */
   
   static int              ppp_clone_create(struct if_clone *, int);
   static int              ppp_clone_destroy(struct ifnet *);
   
   static struct ppp_softc *ppp_create(const char *, int);
   
   static LIST_HEAD(, ppp_softc) ppp_softc_list;
   
   struct if_clone ppp_cloner =
       IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy);
   
   static struct simplelock ppp_list_mutex = SIMPLELOCK_INITIALIZER;
   
   #ifdef PPP_COMPRESS
   /*
    * List of compressors we know about.
    * We leave some space so maybe we can modload compressors.
    */
   
   extern struct compressor ppp_bsd_compress;
   extern struct compressor ppp_deflate, ppp_deflate_draft;
   
   struct compressor *ppp_compressors[PPP_COMPRESSORS_MAX] = {
   #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP)
       &ppp_bsd_compress,
   #endif
   #if DO_DEFLATE && defined(PPP_DEFLATE)
       &ppp_deflate,
       &ppp_deflate_draft,
   #endif
       NULL
   };
   #endif /* PPP_COMPRESS */
   
   
   /*
    * Called from boot code to establish ppp interfaces.
    */
   void
   pppattach(void)
   {
       extern struct linesw ppp_disc;
   
       if (ttyldisc_attach(&ppp_disc) != 0)
           panic("pppattach");
       LIST_INIT(&ppp_softc_list);
       if_clone_attach(&ppp_cloner);
   }
   
   static struct ppp_softc *
   ppp_create(const char *name, int unit)
   {
       struct ppp_softc *sc, *sci, *scl = NULL;
   
       MALLOC(sc, struct ppp_softc *, sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO);
   
       simple_lock(&ppp_list_mutex);
       if (unit == -1) {
           int i = 0;
           LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) {
               scl = sci;
               if (i < sci->sc_unit) {
                   unit = i;
                   break;
               } else {
   #ifdef DIAGNOSTIC
                   KASSERT(i == sci->sc_unit);
   #endif
                   i++;
               }
           }
           if (unit == -1)
               unit = i;
       } else {
           LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) {
               scl = sci;
               if (unit < sci->sc_unit)
                   break;
               else if (unit == sci->sc_unit) {
                   FREE(sc, M_DEVBUF);
                   return NULL;
               }
           }
       }
   
       if (sci != NULL)
           LIST_INSERT_BEFORE(sci, sc, sc_iflist);
       else if (scl != NULL)
           LIST_INSERT_AFTER(scl, sc, sc_iflist);
       else
           LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_iflist);
   
       simple_unlock(&ppp_list_mutex);
   
       (void)snprintf(sc->sc_if.if_xname, sizeof(sc->sc_if.if_xname), "%s%d",
           name, sc->sc_unit = unit);
       callout_init(&sc->sc_timo_ch);
       sc->sc_if.if_softc = sc;
       sc->sc_if.if_mtu = PPP_MTU;
       sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
       sc->sc_if.if_type = IFT_PPP;
       sc->sc_if.if_hdrlen = PPP_HDRLEN;
       sc->sc_if.if_dlt = DLT_NULL;
       sc->sc_if.if_ioctl = pppsioctl;
       sc->sc_if.if_output = pppoutput;
   #ifdef ALTQ
       sc->sc_if.if_start = ppp_ifstart;
   #endif
       IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN);
       sc->sc_inq.ifq_maxlen = IFQ_MAXLEN;
       sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN;
       sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN;
       /* Ratio of 1:2 packets between the regular and the fast queue */
       sc->sc_maxfastq = 2;        
       IFQ_SET_READY(&sc->sc_if.if_snd);
       if_attach(&sc->sc_if);
       if_alloc_sadl(&sc->sc_if);
   #if NBPFILTER > 0
       bpfattach(&sc->sc_if, DLT_NULL, 0);
   #endif
       return sc;
   }
   
   static int
   ppp_clone_create(struct if_clone *ifc, int unit)
   {
       return ppp_create(ifc->ifc_name, unit) == NULL ? EEXIST : 0;
   }
   
   static int
   ppp_clone_destroy(struct ifnet *ifp)
   {
       struct ppp_softc *sc = (struct ppp_softc *)ifp->if_softc;
   
       if (sc->sc_devp != NULL)
           return EBUSY; /* Not removing it */
   
       simple_lock(&ppp_list_mutex);
       LIST_REMOVE(sc, sc_iflist);
       simple_unlock(&ppp_list_mutex);
   
   #if NBPFILTER > 0
       bpfdetach(ifp);
   #endif
       if_detach(ifp);
   
       FREE(sc, M_DEVBUF);
       return 0;
   }
   
   /*
    * Allocate a ppp interface unit and initialize it.
    */
   struct ppp_softc *
   pppalloc(pid_t pid)
   {
       struct ppp_softc *sc = NULL, *scf;
       int i;
   
       simple_lock(&ppp_list_mutex);
       for (scf = LIST_FIRST(&ppp_softc_list); scf != NULL;
           scf = LIST_NEXT(scf, sc_iflist)) {
           if (scf->sc_xfer == pid) {
               scf->sc_xfer = 0;
               simple_unlock(&ppp_list_mutex);
               return scf;
           }
           if (scf->sc_devp == NULL && sc == NULL)
               sc = scf;
       }
       simple_unlock(&ppp_list_mutex);
   
       if (sc == NULL)
           sc = ppp_create(ppp_cloner.ifc_name, -1);
   
   #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
       sc->sc_si = softintr_establish(IPL_SOFTNET, pppintr, sc);
       if (sc->sc_si == NULL) {
           printf("%s: unable to establish softintr\n", sc->sc_if.if_xname);
           return (NULL);
       }
   #endif
       sc->sc_flags = 0;
       sc->sc_mru = PPP_MRU;
       sc->sc_relinq = NULL;
       (void)memset(&sc->sc_stats, 0, sizeof(sc->sc_stats));
   #ifdef VJC
       MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress),
              M_DEVBUF, M_NOWAIT);
       if (sc->sc_comp)
           sl_compress_init(sc->sc_comp);
   #endif
   #ifdef PPP_COMPRESS
       sc->sc_xc_state = NULL;
       sc->sc_rc_state = NULL;
   #endif /* PPP_COMPRESS */
       for (i = 0; i < NUM_NP; ++i)
           sc->sc_npmode[i] = NPMODE_ERROR;
       sc->sc_npqueue = NULL;
       sc->sc_npqtail = &sc->sc_npqueue;
       sc->sc_last_sent = sc->sc_last_recv = time_second;
   
       return sc;
   }
   
   /*
    * Deallocate a ppp unit.  Must be called at splsoftnet or higher.
    */
   void
   pppdealloc(struct ppp_softc *sc)
   {
       struct mbuf *m;
   
   #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
       softintr_disestablish(sc->sc_si);
   #endif
       if_down(&sc->sc_if);
       sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
       sc->sc_devp = NULL;
       sc->sc_xfer = 0;
       for (;;) {
           IF_DEQUEUE(&sc->sc_rawq, m);
           if (m == NULL)
               break;
           m_freem(m);
       }
       for (;;) {
           IF_DEQUEUE(&sc->sc_inq, m);
           if (m == NULL)
               break;
           m_freem(m);
       }
       for (;;) {
           IF_DEQUEUE(&sc->sc_fastq, m);
           if (m == NULL)
               break;
           m_freem(m);
       }
       while ((m = sc->sc_npqueue) != NULL) {
           sc->sc_npqueue = m->m_nextpkt;
           m_freem(m);
       }
       if (sc->sc_togo != NULL) {
           m_freem(sc->sc_togo);
           sc->sc_togo = NULL;
       }
   #ifdef PPP_COMPRESS
       ppp_ccp_closed(sc);
       sc->sc_xc_state = NULL;
       sc->sc_rc_state = NULL;
   #endif /* PPP_COMPRESS */
   #ifdef PPP_FILTER
       if (sc->sc_pass_filt_in.bf_insns != 0) {
           FREE(sc->sc_pass_filt_in.bf_insns, M_DEVBUF);
           sc->sc_pass_filt_in.bf_insns = 0;
           sc->sc_pass_filt_in.bf_len = 0;
       }
       if (sc->sc_pass_filt_out.bf_insns != 0) {
           FREE(sc->sc_pass_filt_out.bf_insns, M_DEVBUF);
           sc->sc_pass_filt_out.bf_insns = 0;
           sc->sc_pass_filt_out.bf_len = 0;
       }
       if (sc->sc_active_filt_in.bf_insns != 0) {
           FREE(sc->sc_active_filt_in.bf_insns, M_DEVBUF);
           sc->sc_active_filt_in.bf_insns = 0;
           sc->sc_active_filt_in.bf_len = 0;
       }
       if (sc->sc_active_filt_out.bf_insns != 0) {
           FREE(sc->sc_active_filt_out.bf_insns, M_DEVBUF);
           sc->sc_active_filt_out.bf_insns = 0;
           sc->sc_active_filt_out.bf_len = 0;
       }
   #endif /* PPP_FILTER */
   #ifdef VJC
       if (sc->sc_comp != 0) {
           FREE(sc->sc_comp, M_DEVBUF);
           sc->sc_comp = 0;
       }
   #endif
       (void)ppp_clone_destroy(&sc->sc_if);
   }
   
   /*
    * Ioctl routine for generic ppp devices.
    */
   int
   pppioctl(struct ppp_softc *sc, u_long cmd, caddr_t data, int flag,
       struct lwp *l)
   {
       int s, error, flags, mru, npx;
       u_int nb;
       struct ppp_option_data *odp;
       struct compressor **cp;
       struct npioctl *npi;
       time_t t;
   #ifdef PPP_FILTER
       struct bpf_program *bp, *nbp;
       struct bpf_insn *newcode, *oldcode;
       int newcodelen;
   #endif /* PPP_FILTER */
   #ifdef  PPP_COMPRESS
       u_char ccp_option[CCP_MAX_OPTION_LENGTH];
   #endif
   
       switch (cmd) {
       case PPPIOCSFLAGS:
       case PPPIOCSMRU:
       case PPPIOCSMAXCID:
       case PPPIOCSCOMPRESS:
       case PPPIOCSNPMODE:
           if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE,
               KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, &sc->sc_if, (void *)cmd,
               NULL) != 0)
                   return (EPERM);
           break;
       case PPPIOCXFERUNIT:
           /* XXX: Why is this privileged?! */
           if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE,
               KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, &sc->sc_if, (void *)cmd,
               NULL) != 0)
                   return (EPERM);
           break;
       default:
           break;
       }
   
       switch (cmd) {
       case FIONREAD:
           *(int *)data = sc->sc_inq.ifq_len;
           break;
   
       case PPPIOCGUNIT:
           *(int *)data = sc->sc_unit;
           break;
   
       case PPPIOCGFLAGS:
           *(u_int *)data = sc->sc_flags;
           break;
   
       case PPPIOCGRAWIN:
           {
               struct ppp_rawin *rwin = (struct ppp_rawin *)data;
               u_char c, q = 0;
   
               for (c = sc->sc_rawin_start; c < sizeof(sc->sc_rawin.buf);)
                   rwin->buf[q++] = sc->sc_rawin.buf[c++];
   
               for (c = 0; c < sc->sc_rawin_start;)
                   rwin->buf[q++] = sc->sc_rawin.buf[c++];
   
               rwin->count = sc->sc_rawin.count;
           }
           break;
   
       case PPPIOCSFLAGS:
           flags = *(int *)data & SC_MASK;
           s = splsoftnet();
   #ifdef PPP_COMPRESS
           if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN))
               ppp_ccp_closed(sc);
   #endif
           splhigh();      /* XXX IMP ME HARDER */
           sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags;
           splx(s);
           break;
   
       case PPPIOCSMRU:
           mru = *(int *)data;
           if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU)
               sc->sc_mru = mru;
           break;
   
       case PPPIOCGMRU:
           *(int *)data = sc->sc_mru;
           break;
   
   #ifdef VJC
       case PPPIOCSMAXCID:
           if (sc->sc_comp) {
               s = splsoftnet();
               sl_compress_setup(sc->sc_comp, *(int *)data);
               splx(s);
           }
           break;
   #endif
   
       case PPPIOCXFERUNIT:
           sc->sc_xfer = l->l_proc->p_pid;
           break;
   
   #ifdef PPP_COMPRESS
       case PPPIOCSCOMPRESS:
           odp = (struct ppp_option_data *) data;
           nb = odp->length;
           if (nb > sizeof(ccp_option))
               nb = sizeof(ccp_option);
           if ((error = copyin(odp->ptr, ccp_option, nb)) != 0)
               return (error);
           if (ccp_option[1] < 2)  /* preliminary check on the length byte */
               return (EINVAL);
           for (cp = ppp_compressors; *cp != NULL; ++cp)
               if ((*cp)->compress_proto == ccp_option[0]) {
                   /*
                    * Found a handler for the protocol - try to allocate
                    * a compressor or decompressor.
                    */
                   error = 0;
                   if (odp->transmit) {
                       s = splsoftnet();
                       if (sc->sc_xc_state != NULL)
                           (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
                       sc->sc_xcomp = *cp;
                       sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb);
                       if (sc->sc_xc_state == NULL) {
                           if (sc->sc_flags & SC_DEBUG)
                               printf("%s: comp_alloc failed\n",
                                   sc->sc_if.if_xname);
                           error = ENOBUFS;
                       }
                       splhigh();  /* XXX IMP ME HARDER */
                       sc->sc_flags &= ~SC_COMP_RUN;
                       splx(s);
                   } else {
                       s = splsoftnet();
                       if (sc->sc_rc_state != NULL)
                           (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
                       sc->sc_rcomp = *cp;
                       sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb);
                       if (sc->sc_rc_state == NULL) {
                           if (sc->sc_flags & SC_DEBUG)
                               printf("%s: decomp_alloc failed\n",
                                   sc->sc_if.if_xname);
                           error = ENOBUFS;
                       }
                       splhigh();  /* XXX IMP ME HARDER */
                       sc->sc_flags &= ~SC_DECOMP_RUN;
                       splx(s);
                   }
                   return (error);
               }
           if (sc->sc_flags & SC_DEBUG)
               printf("%s: no compressor for [%x %x %x], %x\n",
                   sc->sc_if.if_xname, ccp_option[0], ccp_option[1],
                   ccp_option[2], nb);
           return (EINVAL);        /* no handler found */
   #endif /* PPP_COMPRESS */
   
       case PPPIOCGNPMODE:
       case PPPIOCSNPMODE:
           npi = (struct npioctl *) data;
           switch (npi->protocol) {
           case PPP_IP:
               npx = NP_IP;
               break;
           case PPP_IPV6:
               npx = NP_IPV6;
               break;
           default:
               return EINVAL;
           }
           if (cmd == PPPIOCGNPMODE) {
               npi->mode = sc->sc_npmode[npx];
           } else {
               if (npi->mode != sc->sc_npmode[npx]) {
                   s = splnet();
                   sc->sc_npmode[npx] = npi->mode;
                   if (npi->mode != NPMODE_QUEUE) {
                       ppp_requeue(sc);
                       ppp_restart(sc);
                   }
                   splx(s);
               }
           }
           break;
   
       case PPPIOCGIDLE:
           s = splsoftnet();
           t = time_second;
           ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent;
           ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv;
           splx(s);
           break;
   
   #ifdef PPP_FILTER
       case PPPIOCSPASS:
       case PPPIOCSACTIVE:
           /* These are no longer supported. */
           return EOPNOTSUPP;
   
       case PPPIOCSIPASS:
       case PPPIOCSOPASS:
       case PPPIOCSIACTIVE:
       case PPPIOCSOACTIVE:
           nbp = (struct bpf_program *) data;
           if ((unsigned) nbp->bf_len > BPF_MAXINSNS)
               return EINVAL;
           newcodelen = nbp->bf_len * sizeof(struct bpf_insn);
           if (newcodelen != 0) {
               newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK);
               /* WAITOK -- malloc() never fails. */
               if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode,
                                  newcodelen)) != 0) {
                   free(newcode, M_DEVBUF);
                   return error;
               }
               if (!bpf_validate(newcode, nbp->bf_len)) {
                   free(newcode, M_DEVBUF);
                   return EINVAL;
               }
           } else
               newcode = 0;
           switch (cmd) {
           case PPPIOCSIPASS:
               bp = &sc->sc_pass_filt_in;
               break;
   
           case PPPIOCSOPASS:
               bp = &sc->sc_pass_filt_out;
               break;
   
           case PPPIOCSIACTIVE:
               bp = &sc->sc_active_filt_in;
               break;
   
           case PPPIOCSOACTIVE:
               bp = &sc->sc_active_filt_out;
               break;
           default:
               free(newcode, M_DEVBUF);
               return (EPASSTHROUGH);
           }
           oldcode = bp->bf_insns;
           s = splnet();
           bp->bf_len = nbp->bf_len;
           bp->bf_insns = newcode;
           splx(s);
           if (oldcode != 0)
               free(oldcode, M_DEVBUF);
           break;
   #endif /* PPP_FILTER */
   
       default:
           return (EPASSTHROUGH);
       }
       return (0);
   }
   
   /*
    * Process an ioctl request to the ppp network interface.
    */
   static int
   pppsioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
   {
       struct lwp *l = curlwp;     /* XXX */
       struct ppp_softc *sc = ifp->if_softc;
       struct ifaddr *ifa = (struct ifaddr *)data;
       struct ifreq *ifr = (struct ifreq *)data;
       struct ppp_stats *psp;
   #ifdef  PPP_COMPRESS
       struct ppp_comp_stats *pcp;
   #endif
       int s = splnet(), error = 0;
   
       switch (cmd) {
       case SIOCSIFFLAGS:
           if ((ifp->if_flags & IFF_RUNNING) == 0)
               ifp->if_flags &= ~IFF_UP;
           break;
   
       case SIOCSIFADDR:
           switch (ifa->ifa_addr->sa_family) {
   #ifdef INET
           case AF_INET:
               break;
   #endif
   #ifdef INET6
           case AF_INET6:
               break;
   #endif
           default:
               error = EAFNOSUPPORT;
               break;
           }
           break;
   
       case SIOCSIFDSTADDR:
           switch (ifa->ifa_addr->sa_family) {
   #ifdef INET
           case AF_INET:
               break;
   #endif
   #ifdef INET6
           case AF_INET6:
               break;
   #endif
           default:
               error = EAFNOSUPPORT;
               break;
           }
           break;
   
       case SIOCSIFMTU:
           if ((error = kauth_authorize_network(l->l_cred,
               KAUTH_NETWORK_INTERFACE, KAUTH_REQ_NETWORK_INTERFACE_SETPRIV,
               ifp, (void *)cmd, NULL) != 0))
               break;
           sc->sc_if.if_mtu = ifr->ifr_mtu;
           break;
   
       case SIOCGIFMTU:
           ifr->ifr_mtu = sc->sc_if.if_mtu;
           break;
   
       case SIOCADDMULTI:
       case SIOCDELMULTI:
           if (ifr == 0) {
               error = EAFNOSUPPORT;
               break;
           }
           switch (ifr->ifr_addr.sa_family) {
   #ifdef INET
           case AF_INET:
               break;
   #endif
   #ifdef INET6
           case AF_INET6:
               break;
   #endif
           default:
               error = EAFNOSUPPORT;
               break;
           }
           break;
   
       case SIOCGPPPSTATS:
           psp = &((struct ifpppstatsreq *) data)->stats;
           memset(psp, 0, sizeof(*psp));
           psp->p = sc->sc_stats;
   #if defined(VJC) && !defined(SL_NO_STATS)
           if (sc->sc_comp) {
               psp->vj.vjs_packets = sc->sc_comp->sls_packets;
               psp->vj.vjs_compressed = sc->sc_comp->sls_compressed;
               psp->vj.vjs_searches = sc->sc_comp->sls_searches;
               psp->vj.vjs_misses = sc->sc_comp->sls_misses;
               psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin;
               psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin;
               psp->vj.vjs_errorin = sc->sc_comp->sls_errorin;
               psp->vj.vjs_tossed = sc->sc_comp->sls_tossed;
           }
   #endif /* VJC */
           break;
   
   #ifdef PPP_COMPRESS
       case SIOCGPPPCSTATS:
           pcp = &((struct ifpppcstatsreq *) data)->stats;
           memset(pcp, 0, sizeof(*pcp));
           if (sc->sc_xc_state != NULL)
               (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c);
           if (sc->sc_rc_state != NULL)
               (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d);
           break;
   #endif /* PPP_COMPRESS */
   
       default:
           error = EINVAL;
       }
       splx(s);
       return (error);
   }
   
   /*
    * Queue a packet.  Start transmission if not active.
    * Packet is placed in Information field of PPP frame.
    */
   int
   pppoutput(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst,
       struct rtentry *rtp)
   {
       struct ppp_softc *sc = ifp->if_softc;
       int protocol, address, control;
       u_char *cp;
       int s, error;
   #ifdef INET
       struct ip *ip;
   #endif
       struct ifqueue *ifq;
       enum NPmode mode;
       int len;
       ALTQ_DECL(struct altq_pktattr pktattr;)
   
       if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0
           || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) {
           error = ENETDOWN;       /* sort of */
           goto bad;
       }
   
       IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr);
   
       /*
        * Compute PPP header.
        */
       m0->m_flags &= ~M_HIGHPRI;
       switch (dst->sa_family) {
   #ifdef INET
       case AF_INET:
           address = PPP_ALLSTATIONS;
           control = PPP_UI;
           protocol = PPP_IP;
           mode = sc->sc_npmode[NP_IP];
   
           /*
            * If this packet has the "low delay" bit set in the IP header,
            * put it on the fastq instead.
            */
           ip = mtod(m0, struct ip *);
           if (ip->ip_tos & IPTOS_LOWDELAY)
               m0->m_flags |= M_HIGHPRI;
           break;
   #endif
   #ifdef INET6
       case AF_INET6:
           address = PPP_ALLSTATIONS;      /*XXX*/
           control = PPP_UI;               /*XXX*/
           protocol = PPP_IPV6;
           mode = sc->sc_npmode[NP_IPV6];
   
   #if 0   /* XXX flowinfo/traffic class, maybe? */
           /*
            * If this packet has the "low delay" bit set in the IP header,
            * put it on the fastq instead.
            */
           ip = mtod(m0, struct ip *);
           if (ip->ip_tos & IPTOS_LOWDELAY)
               m0->m_flags |= M_HIGHPRI;
   #endif
           break;
   #endif
       case AF_UNSPEC:
           address = PPP_ADDRESS(dst->sa_data);
           control = PPP_CONTROL(dst->sa_data);
           protocol = PPP_PROTOCOL(dst->sa_data);
           mode = NPMODE_PASS;
           break;
       default:
           printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family);
           error = EAFNOSUPPORT;
           goto bad;
       }
   
       /*
        * Drop this packet, or return an error, if necessary.
        */
       if (mode == NPMODE_ERROR) {
           error = ENETDOWN;
           goto bad;
       }
       if (mode == NPMODE_DROP) {
           error = 0;
           goto bad;
       }
   
       /*
        * Add PPP header.
        */
       M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT);
       if (m0 == NULL) {
           error = ENOBUFS;
           goto bad;
       }
   
       cp = mtod(m0, u_char *);
       *cp++ = address;
       *cp++ = control;
       *cp++ = protocol >> 8;
       *cp++ = protocol & 0xff;
   
       len = m_length(m0);
   
       if (sc->sc_flags & SC_LOG_OUTPKT) {
           printf("%s output: ", ifp->if_xname);
           pppdumpm(m0);
       }
   
       if ((protocol & 0x8000) == 0) {
   #ifdef PPP_FILTER
           /*
            * Apply the pass and active filters to the packet,
            * but only if it is a data packet.
            */
           if (sc->sc_pass_filt_out.bf_insns != 0
               && bpf_filter(sc->sc_pass_filt_out.bf_insns, (u_char *) m0,
                             len, 0) == 0) {
               error = 0;          /* drop this packet */
               goto bad;
           }
  
          /*
           * Update the time we sent the most recent packet.
           */
          if (sc->sc_active_filt_out.bf_insns == 0
              || bpf_filter(sc->sc_active_filt_out.bf_insns, (u_char *) m0,
                            len, 0))
              sc->sc_last_sent = time_second;
  #else
          /*
           * Update the time we sent the most recent packet.
           */
          sc->sc_last_sent = time_second;
  #endif /* PPP_FILTER */
      }
  
  #if NBPFILTER > 0
      /*
       * See if bpf wants to look at the packet.
       */
      if (sc->sc_if.if_bpf)
          bpf_mtap(sc->sc_if.if_bpf, m0);
  #endif
  
      /*
       * Put the packet on the appropriate queue.
       */
      s = splnet();
      if (mode == NPMODE_QUEUE) {
          /* XXX we should limit the number of packets on this queue */
          *sc->sc_npqtail = m0;
          m0->m_nextpkt = NULL;
          sc->sc_npqtail = &m0->m_nextpkt;
      } else {
          ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL;
          if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0
                  ALTQ_COMMA ALTQ_DECL(&pktattr))) != 0) {
              splx(s);
              sc->sc_if.if_oerrors++;
              sc->sc_stats.ppp_oerrors++;
              return (error);
          }
          ppp_restart(sc);
      }
      ifp->if_opackets++;
      ifp->if_obytes += len;
  
      splx(s);
      return (0);
  
  bad:
      m_freem(m0);
      return (error);
  }
  
  /*
   * After a change in the NPmode for some NP, move packets from the
   * npqueue to the send queue or the fast queue as appropriate.
   * Should be called at splnet, since we muck with the queues.
   */
  static void
  ppp_requeue(struct ppp_softc *sc)
  {
      struct mbuf *m, **mpp;
      struct ifqueue *ifq;
      enum NPmode mode;
      int error;
  
      for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) {
          switch (PPP_PROTOCOL(mtod(m, u_char *))) {
          case PPP_IP:
              mode = sc->sc_npmode[NP_IP];
              break;
          case PPP_IPV6:
              mode = sc->sc_npmode[NP_IPV6];
              break;
          default:
              mode = NPMODE_PASS;
          }
  
          switch (mode) {
          case NPMODE_PASS:
              /*
               * This packet can now go on one of the queues to be sent.
               */
              *mpp = m->m_nextpkt;
              m->m_nextpkt = NULL;
              ifq = (m->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL;
              if ((error = ifq_enqueue2(&sc->sc_if, ifq, m ALTQ_COMMA
                  ALTQ_DECL(NULL))) != 0) {
                  sc->sc_if.if_oerrors++;
                  sc->sc_stats.ppp_oerrors++;
              }
              break;
  
          case NPMODE_DROP:
          case NPMODE_ERROR:
              *mpp = m->m_nextpkt;
              m_freem(m);
              break;
  
          case NPMODE_QUEUE:
              mpp = &m->m_nextpkt;
              break;
          }
      }
      sc->sc_npqtail = mpp;
  }
  
  /*
   * Transmitter has finished outputting some stuff;
   * remember to call sc->sc_start later at splsoftnet.
   */
  void
  ppp_restart(struct ppp_softc *sc)
  {
      int s = splhigh();  /* XXX IMP ME HARDER */
  
      sc->sc_flags &= ~SC_TBUSY;
  #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
      softintr_schedule(sc->sc_si);
  #else
      schednetisr(NETISR_PPP);
  #endif
      splx(s);
  }
  
  /*
   * Get a packet to send.  This procedure is intended to be called at
   * splsoftnet, since it may involve time-consuming operations such as
   * applying VJ compression, packet compression, address/control and/or
   * protocol field compression to the packet.
   */
  struct mbuf *
  ppp_dequeue(struct ppp_softc *sc)
  {
      struct mbuf *m, *mp;
      u_char *cp;
      int address, control, protocol;
      int s;
  
      /*
       * Grab a packet to send: first try the fast queue, then the
       * normal queue.
       */
      s = splnet();
      if (sc->sc_nfastq < sc->sc_maxfastq) {
          IF_DEQUEUE(&sc->sc_fastq, m);
          if (m != NULL)
              sc->sc_nfastq++;
          else
              IFQ_DEQUEUE(&sc->sc_if.if_snd, m);
      } else {
          sc->sc_nfastq = 0;
          IFQ_DEQUEUE(&sc->sc_if.if_snd, m);
          if (m == NULL) {
              IF_DEQUEUE(&sc->sc_fastq, m);
              if (m != NULL)
                  sc->sc_nfastq++;
          }
      }
      splx(s);
  
      if (m == NULL)
          return NULL;
  
      ++sc->sc_stats.ppp_opackets;
  
      /*
       * Extract the ppp header of the new packet.
       * The ppp header will be in one mbuf.
       */
      cp = mtod(m, u_char *);
      address = PPP_ADDRESS(cp);
      control = PPP_CONTROL(cp);
      protocol = PPP_PROTOCOL(cp);
  
      switch (protocol) {
      case PPP_IP:
  #ifdef VJC
          /*
           * If the packet is a TCP/IP packet, see if we can compress it.
           */
          if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) {
              struct ip *ip;
              int type;
  
              mp = m;
              ip = (struct ip *) (cp + PPP_HDRLEN);
              if (mp->m_len <= PPP_HDRLEN) {
                  mp = mp->m_next;
                  if (mp == NULL)
                      break;
                  ip = mtod(mp, struct ip *);
              }
              /* this code assumes the IP/TCP header is in one non-shared mbuf */
              if (ip->ip_p == IPPROTO_TCP) {
                  type = sl_compress_tcp(mp, ip, sc->sc_comp,
                                         !(sc->sc_flags & SC_NO_TCP_CCID));
                  switch (type) {
                  case TYPE_UNCOMPRESSED_TCP:
                      protocol = PPP_VJC_UNCOMP;
                      break;
                  case TYPE_COMPRESSED_TCP:
                      protocol = PPP_VJC_COMP;
                      cp = mtod(m, u_char *);
                      cp[0] = address;    /* header has moved */
                      cp[1] = control;
                      cp[2] = 0;
                      break;
                  }
                  cp[3] = protocol;       /* update protocol in PPP header */
              }
          }
  #endif  /* VJC */
          break;
  
  #ifdef PPP_COMPRESS
      case PPP_CCP:
          ppp_ccp(sc, m, 0);
          break;
  #endif  /* PPP_COMPRESS */
      }
  
  #ifdef PPP_COMPRESS
      if (protocol != PPP_LCP && protocol != PPP_CCP
          && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) {
          struct mbuf *mcomp = NULL;
          int slen;
  
          slen = 0;
          for (mp = m; mp != NULL; mp = mp->m_next)
              slen += mp->m_len;
          (*sc->sc_xcomp->compress)
              (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN);
          if (mcomp != NULL) {
              if (sc->sc_flags & SC_CCP_UP) {
                  /* Send the compressed packet instead of the original. */
                  m_freem(m);
                  m = mcomp;
                  cp = mtod(m, u_char *);
                  protocol = cp[3];
              } else {
                  /* Can't transmit compressed packets until CCP is up. */
                  m_freem(mcomp);
              }
          }
      }
  #endif  /* PPP_COMPRESS */
  
      /*
       * Compress the address/control and protocol, if possible.
       */
      if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS &&
          control == PPP_UI && protocol != PPP_ALLSTATIONS &&
          protocol != PPP_LCP) {
          /* can compress address/control */
          m->m_data += 2;
          m->m_len -= 2;
      }
      if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) {
          /* can compress protocol */
          if (mtod(m, u_char *) == cp) {
              cp[2] = cp[1];      /* move address/control up */
              cp[1] = cp[0];
          }
          ++m->m_data;
          --m->m_len;
      }
  
      return m;
  }
  
  #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS
  void
  pppnetisr(void)
  {
          struct ppp_softc *sc;
  
          for (sc = LIST_FIRST(&ppp_softc_list); sc != NULL;
              sc = LIST_NEXT(sc, sc_iflist))
                  pppintr(sc);
  }
  #endif
  
  /*
   * Software interrupt routine, called at splsoftnet.
   */
  static void
  pppintr(void *arg)
  {
          struct ppp_softc *sc = arg;
          struct mbuf *m;
          int s;
  
          if (!(sc->sc_flags & SC_TBUSY)
              && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head
                  || sc->sc_outm)) {
                  s = splhigh();  /* XXX IMP ME HARDER */
                  sc->sc_flags |= SC_TBUSY;
                  splx(s);
                  (*sc->sc_start)(sc);
          }
          for (;;) {
                  s = splnet();
                  IF_DEQUEUE(&sc->sc_rawq, m);
                  splx(s);
                  if (m == NULL)
                          break;
                  ppp_inproc(sc, m);
          }
  }
  
  #ifdef PPP_COMPRESS
  /*
   * Handle a CCP packet.  `rcvd' is 1 if the packet was received,
   * 0 if it is about to be transmitted.
   */
  static void
  ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd)
  {
      u_char *dp, *ep;
      struct mbuf *mp;
      int slen, s;
  
      /*
       * Get a pointer to the data after the PPP header.
       */
      if (m->m_len <= PPP_HDRLEN) {
          mp = m->m_next;
          if (mp == NULL)
              return;
          dp = (mp != NULL)? mtod(mp, u_char *): NULL;
      } else {
          mp = m;
          dp = mtod(mp, u_char *) + PPP_HDRLEN;
      }
  
      ep = mtod(mp, u_char *) + mp->m_len;
      if (dp + CCP_HDRLEN > ep)
          return;
      slen = CCP_LENGTH(dp);
      if (dp + slen > ep) {
          if (sc->sc_flags & SC_DEBUG)
              printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n",
                  dp, slen, mtod(mp, u_char *), mp->m_len);
          return;
      }
  
      switch (CCP_CODE(dp)) {
      case CCP_CONFREQ:
      case CCP_TERMREQ:
      case CCP_TERMACK:
          /* CCP must be going down - disable compression */
          if (sc->sc_flags & SC_CCP_UP) {
              s = splhigh();      /* XXX IMP ME HARDER */
              sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN);
              splx(s);
          }
          break;
  
      case CCP_CONFACK:
          if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP)
              && slen >= CCP_HDRLEN + CCP_OPT_MINLEN
              && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) {
              if (!rcvd) {
                  /* we're agreeing to send compressed packets. */
                  if (sc->sc_xc_state != NULL
                      && (*sc->sc_xcomp->comp_init)
                          (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
                           sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) {
                      s = splhigh();      /* XXX IMP ME HARDER */
                      sc->sc_flags |= SC_COMP_RUN;
                      splx(s);
                  }
              } else {
                  /* peer is agreeing to send compressed packets. */
                  if (sc->sc_rc_state != NULL
                      && (*sc->sc_rcomp->decomp_init)
                          (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
                           sc->sc_unit, 0, sc->sc_mru,
                           sc->sc_flags & SC_DEBUG)) {
                      s = splhigh();      /* XXX IMP ME HARDER */
                      sc->sc_flags |= SC_DECOMP_RUN;
                      sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR);
                      splx(s);
                  }
              }
          }
          break;
  
      case CCP_RESETACK:
          if (sc->sc_flags & SC_CCP_UP) {
              if (!rcvd) {
                  if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN))
                      (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state);
              } else {
                  if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
                      (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state);
                      s = splhigh();      /* XXX IMP ME HARDER */
                      sc->sc_flags &= ~SC_DC_ERROR;
                      splx(s);
                  }
              }
          }
          break;
      }
  }
  
  /*
   * CCP is down; free (de)compressor state if necessary.
   */
  static void
  ppp_ccp_closed(struct ppp_softc *sc)
  {
      if (sc->sc_xc_state) {
          (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
          sc->sc_xc_state = NULL;
      }
      if (sc->sc_rc_state) {
          (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
          sc->sc_rc_state = NULL;
      }
  }
  #endif /* PPP_COMPRESS */
  
  /*
   * PPP packet input routine.
   * The caller has checked and removed the FCS and has inserted
   * the address/control bytes and the protocol high byte if they
   * were omitted.
   */
  void
  ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost)
  {
      int s = splhigh();  /* XXX IMP ME HARDER */
  
      if (lost)
          m->m_flags |= M_ERRMARK;
      IF_ENQUEUE(&sc->sc_rawq, m);
  #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
      softintr_schedule(sc->sc_si);
  #else
      schednetisr(NETISR_PPP);
  #endif
      splx(s);
  }
  
  /*
   * Process a received PPP packet, doing decompression as necessary.
   * Should be called at splsoftnet.
   */
  #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \
                           TYPE_UNCOMPRESSED_TCP)
  
  static void
  ppp_inproc(struct ppp_softc *sc, struct mbuf *m)
  {
      struct ifnet *ifp = &sc->sc_if;
      struct ifqueue *inq;
      int s, ilen, proto, rv;
      u_char *cp, adrs, ctrl;
      struct mbuf *mp, *dmp = NULL;
  #ifdef VJC
      int xlen;
      u_char *iphdr;
      u_int hlen;
  #endif
  
      sc->sc_stats.ppp_ipackets++;
  
      if (sc->sc_flags & SC_LOG_INPKT) {
          ilen = 0;
          for (mp = m; mp != NULL; mp = mp->m_next)
              ilen += mp->m_len;
          printf("%s: got %d bytes\n", ifp->if_xname, ilen);
          pppdumpm(m);
      }
  
      cp = mtod(m, u_char *);
      adrs = PPP_ADDRESS(cp);
      ctrl = PPP_CONTROL(cp);
      proto = PPP_PROTOCOL(cp);
  
      if (m->m_flags & M_ERRMARK) {
          m->m_flags &= ~M_ERRMARK;
          s = splhigh();  /* XXX IMP ME HARDER */
          sc->sc_flags |= SC_VJ_RESET;
          splx(s);
      }
  
  #ifdef PPP_COMPRESS
      /*
       * Decompress this packet if necessary, update the receiver's
       * dictionary, or take appropriate action on a CCP packet.
       */
      if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)
          && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) {
          /* decompress this packet */
          rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp);
          if (rv == DECOMP_OK) {
              m_freem(m);
              if (dmp == NULL) {
                  /* no error, but no decompressed packet produced */
                  return;
              }
              m = dmp;
              cp = mtod(m, u_char *);
              proto = PPP_PROTOCOL(cp);
  
          } else {
              /*
               * An error has occurred in decompression.
               * Pass the compressed packet up to pppd, which may take
               * CCP down or issue a Reset-Req.
               */
              if (sc->sc_flags & SC_DEBUG)
                  printf("%s: decompress failed %d\n", ifp->if_xname, rv);
              s = splhigh();      /* XXX IMP ME HARDER */
              sc->sc_flags |= SC_VJ_RESET;
              if (rv == DECOMP_ERROR)
                  sc->sc_flags |= SC_DC_ERROR;
              else
                  sc->sc_flags |= SC_DC_FERROR;
              splx(s);
          }
  
      } else {
          if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
              (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m);
          }
          if (proto == PPP_CCP) {
              ppp_ccp(sc, m, 1);
          }
      }
  #endif
  
      ilen = 0;
      for (mp = m; mp != NULL; mp = mp->m_next)
          ilen += mp->m_len;
  
  #ifdef VJC
      if (sc->sc_flags & SC_VJ_RESET) {
          /*
           * If we've missed a packet, we must toss subsequent compressed
           * packets which don't have an explicit connection ID.
           */
          if (sc->sc_comp)
              sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp);
          s = splhigh();  /* XXX IMP ME HARDER */
          sc->sc_flags &= ~SC_VJ_RESET;
          splx(s);
      }
  
      /*
       * See if we have a VJ-compressed packet to uncompress.
       */
      if (proto == PPP_VJC_COMP) {
          if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
              goto bad;
  
          xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
                                        ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP,
                                        sc->sc_comp, &iphdr, &hlen);
  
          if (xlen <= 0) {
              if (sc->sc_flags & SC_DEBUG)
                  printf("%s: VJ uncompress failed on type comp\n",
                      ifp->if_xname);
              goto bad;
          }
  
          /* Copy the PPP and IP headers into a new mbuf. */
          MGETHDR(mp, M_DONTWAIT, MT_DATA);
          if (mp == NULL)
              goto bad;
          mp->m_len = 0;
          mp->m_next = NULL;
          if (hlen + PPP_HDRLEN > MHLEN) {
              MCLGET(mp, M_DONTWAIT);
              if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) {
                  m_freem(mp);
                  goto bad;       /* lose if big headers and no clusters */
              }
          }
          cp = mtod(mp, u_char *);
          cp[0] = adrs;
          cp[1] = ctrl;
          cp[2] = 0;
          cp[3] = PPP_IP;
          proto = PPP_IP;
          bcopy(iphdr, cp + PPP_HDRLEN, hlen);
          mp->m_len = hlen + PPP_HDRLEN;
  
          /*
           * Trim the PPP and VJ headers off the old mbuf
           * and stick the new and old mbufs together.
           */
          m->m_data += PPP_HDRLEN + xlen;
          m->m_len -= PPP_HDRLEN + xlen;
          if (m->m_len <= M_TRAILINGSPACE(mp)) {
              bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len);
              mp->m_len += m->m_len;
              MFREE(m, mp->m_next);
          } else
              mp->m_next = m;
          m = mp;
          ilen += hlen - xlen;
  
      } else if (proto == PPP_VJC_UNCOMP) {
          if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
              goto bad;
  
          xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
                                        ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP,
                                        sc->sc_comp, &iphdr, &hlen);
  
          if (xlen < 0) {
              if (sc->sc_flags & SC_DEBUG)
                  printf("%s: VJ uncompress failed on type uncomp\n",
                      ifp->if_xname);
              goto bad;
          }
  
          proto = PPP_IP;
          cp[3] = PPP_IP;
      }
  #endif /* VJC */
  
      /*
       * If the packet will fit in a header mbuf, don't waste a
       * whole cluster on it.
       */
      if (ilen <= MHLEN && M_IS_CLUSTER(m)) {
          MGETHDR(mp, M_DONTWAIT, MT_DATA);
          if (mp != NULL) {
              m_copydata(m, 0, ilen, mtod(mp, caddr_t));
              m_freem(m);
              m = mp;
              m->m_len = ilen;
          }
      }
      m->m_pkthdr.len = ilen;
      m->m_pkthdr.rcvif = ifp;
  
      if ((proto & 0x8000) == 0) {
  #ifdef PPP_FILTER
          /*
           * See whether we want to pass this packet, and
           * if it counts as link activity.
           */
          if (sc->sc_pass_filt_in.bf_insns != 0
              && bpf_filter(sc->sc_pass_filt_in.bf_insns, (u_char *) m,
                            ilen, 0) == 0) {
              /* drop this packet */
              m_freem(m);
              return;
          }
          if (sc->sc_active_filt_in.bf_insns == 0
              || bpf_filter(sc->sc_active_filt_in.bf_insns, (u_char *) m,
                            ilen, 0))
              sc->sc_last_recv = time_second;
  #else
          /*
           * Record the time that we received this packet.
           */
          sc->sc_last_recv = time_second;
  #endif /* PPP_FILTER */
      }
  
  #if NBPFILTER > 0
      /* See if bpf wants to look at the packet. */
      if (sc->sc_if.if_bpf)
          bpf_mtap(sc->sc_if.if_bpf, m);
  #endif
  
      rv = 0;
      switch (proto) {
  #ifdef INET
      case PPP_IP:
          /*
           * IP packet - take off the ppp header and pass it up to IP.
           */
          if ((ifp->if_flags & IFF_UP) == 0
              || sc->sc_npmode[NP_IP] != NPMODE_PASS) {
              /* interface is down - drop the packet. */
              m_freem(m);
              return;
          }
          m->m_pkthdr.len -= PPP_HDRLEN;
          m->m_data += PPP_HDRLEN;
          m->m_len -= PPP_HDRLEN;
  #ifdef GATEWAY
          if (ipflow_fastforward(m))
                  return;
  #endif
          schednetisr(NETISR_IP);
          inq = &ipintrq;
          break;
  #endif
  
  #ifdef INET6
      case PPP_IPV6:
          /*
           * IPv6 packet - take off the ppp header and pass it up to IPv6.
           */
          if ((ifp->if_flags & IFF_UP) == 0
              || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) {
              /* interface is down - drop the packet. */
              m_freem(m);
              return;
          }
          m->m_pkthdr.len -= PPP_HDRLEN;
          m->m_data += PPP_HDRLEN;
          m->m_len -= PPP_HDRLEN;
          schednetisr(NETISR_IPV6);
          inq = &ip6intrq;
          break;
  #endif
  
      default:
          /*
           * Some other protocol - place on input queue for read().
           */
          inq = &sc->sc_inq;
          rv = 1;
          break;
      }
  
      /*
       * Put the packet on the appropriate input queue.
       */
      s = splnet();
      if (IF_QFULL(inq)) {
          IF_DROP(inq);
          splx(s);
          if (sc->sc_flags & SC_DEBUG)
              printf("%s: input queue full\n", ifp->if_xname);
          ifp->if_iqdrops++;
          goto bad;
      }
      IF_ENQUEUE(inq, m);
      splx(s);
      ifp->if_ipackets++;
      ifp->if_ibytes += ilen;
  
      if (rv)
          (*sc->sc_ctlp)(sc);
  
      return;
  
   bad:
      m_freem(m);
      sc->sc_if.if_ierrors++;
      sc->sc_stats.ppp_ierrors++;
  }
  
  #define MAX_DUMP_BYTES  128
  
  static void
  pppdumpm(struct mbuf *m0)
  {
      char buf[3*MAX_DUMP_BYTES+4];
      char *bp = buf;
      struct mbuf *m;
  
      for (m = m0; m; m = m->m_next) {
          int l = m->m_len;
          u_char *rptr = (u_char *)m->m_data;
  
          while (l--) {
              if (bp > buf + sizeof(buf) - 4)
                  goto done;
              *bp++ = hexdigits[*rptr >> 4]; /* convert byte to ascii hex */
              *bp++ = hexdigits[*rptr++ & 0xf];
          }
  
          if (m->m_next) {
              if (bp > buf + sizeof(buf) - 3)
                  goto done;
              *bp++ = '|';
          } else
              *bp++ = ' ';
      }
  done:
      if (m)
          *bp++ = '>';
      *bp = 0;
      printf("%s\n", buf);
  }
  
  #ifdef ALTQ
  /*
   * a wrapper to transmit a packet from if_start since ALTQ uses
   * if_start to send a packet.
   */
  static void
  ppp_ifstart(struct ifnet *ifp)
  {
          struct ppp_softc *sc;
  
          sc = ifp->if_softc;
          (*sc->sc_start)(sc);
  }
  #endif

Cache object: 5a978d81f963aea983c14f258f0b2be9