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Annotation of XNU/bsd/net/if_ppp.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver.
        !            24:  *
        !            25:  * Copyright (c) 1989 Carnegie Mellon University.
        !            26:  * All rights reserved.
        !            27:  *
        !            28:  * Redistribution and use in source and binary forms are permitted
        !            29:  * provided that the above copyright notice and this paragraph are
        !            30:  * duplicated in all such forms and that any documentation,
        !            31:  * advertising materials, and other materials related to such
        !            32:  * distribution and use acknowledge that the software was developed
        !            33:  * by Carnegie Mellon University.  The name of the
        !            34:  * University may not be used to endorse or promote products derived
        !            35:  * from this software without specific prior written permission.
        !            36:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            37:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            38:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            39:  *
        !            40:  * Drew D. Perkins
        !            41:  * Carnegie Mellon University
        !            42:  * 4910 Forbes Ave.
        !            43:  * Pittsburgh, PA 15213
        !            44:  * (412) 268-8576
        !            45:  * [email protected]
        !            46:  *
        !            47:  * Based on:
        !            48:  *     @(#)if_sl.c     7.6.1.2 (Berkeley) 2/15/89
        !            49:  *
        !            50:  * Copyright (c) 1987 Regents of the University of California.
        !            51:  * All rights reserved.
        !            52:  *
        !            53:  * Redistribution and use in source and binary forms are permitted
        !            54:  * provided that the above copyright notice and this paragraph are
        !            55:  * duplicated in all such forms and that any documentation,
        !            56:  * advertising materials, and other materials related to such
        !            57:  * distribution and use acknowledge that the software was developed
        !            58:  * by the University of California, Berkeley.  The name of the
        !            59:  * University may not be used to endorse or promote products derived
        !            60:  * from this software without specific prior written permission.
        !            61:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            62:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            63:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            64:  *
        !            65:  * Serial Line interface
        !            66:  *
        !            67:  * Rick Adams
        !            68:  * Center for Seismic Studies
        !            69:  * 1300 N 17th Street, Suite 1450
        !            70:  * Arlington, Virginia 22209
        !            71:  * (703)276-7900
        !            72:  * [email protected]
        !            73:  * seismo!rick
        !            74:  *
        !            75:  * Pounded on heavily by Chris Torek ([email protected], umcp-cs!chris).
        !            76:  * Converted to 4.3BSD Beta by Chris Torek.
        !            77:  * Other changes made at Berkeley, based in part on code by Kirk Smith.
        !            78:  *
        !            79:  * Converted to 4.3BSD+ 386BSD by Brad Parker ([email protected])
        !            80:  * Added VJ tcp header compression; more unified ioctls
        !            81:  *
        !            82:  * Extensively modified by Paul Mackerras ([email protected]).
        !            83:  * Cleaned up a lot of the mbuf-related code to fix bugs that
        !            84:  * caused system crashes and packet corruption.  Changed pppstart
        !            85:  * so that it doesn't just give up with a collision if the whole
        !            86:  * packet doesn't fit in the output ring buffer.
        !            87:  *
        !            88:  * Added priority queueing for interactive IP packets, following
        !            89:  * the model of if_sl.c, plus hooks for bpf.
        !            90:  * Paul Mackerras ([email protected]).
        !            91:  */
        !            92: 
        !            93: /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
        !            94: /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */
        !            95: 
        !            96: #include "ppp.h"
        !            97: #if NPPP > 0
        !            98: 
        !            99: #include "opt_inet.h"
        !           100: #include "opt_ipx.h"
        !           101: #include "opt_ppp.h"
        !           102: 
        !           103: #if INET
        !           104: #define VJC
        !           105: #endif
        !           106: #define PPP_COMPRESS
        !           107: 
        !           108: #include <sys/param.h>
        !           109: #include <sys/systm.h>
        !           110: #include <sys/proc.h>
        !           111: #include <sys/mbuf.h>
        !           112: #include <sys/socket.h>
        !           113: #include <sys/filio.h>
        !           114: #include <sys/sockio.h>
        !           115: #include <sys/kernel.h>
        !           116: #include <sys/time.h>
        !           117: #include <sys/malloc.h>
        !           118: 
        !           119: #include <net/if.h>
        !           120: #include <net/if_types.h>
        !           121: #include <net/netisr.h>
        !           122: 
        !           123: #include <libkern/libkern.h>
        !           124: 
        !           125: #if INET
        !           126: #include <netinet/in.h>
        !           127: #include <netinet/in_systm.h>
        !           128: #include <netinet/in_var.h>
        !           129: #include <netinet/ip.h>
        !           130: #endif
        !           131: 
        !           132: #if IPX
        !           133: #include <netipx/ipx.h>
        !           134: #include <netipx/ipx_if.h>
        !           135: #endif
        !           136: 
        !           137: #include "bpfilter.h"
        !           138: #if NBPFILTER > 0
        !           139: #include <net/bpf.h>
        !           140: #endif
        !           141: 
        !           142: #if defined(PPP_FILTER) && NBPFILTER == 0
        !           143: #error "PPP_FILTER requires bpf"
        !           144: #endif
        !           145: 
        !           146: #if VJC
        !           147: #include <net/slcompress.h>
        !           148: #endif
        !           149: 
        !           150: #include <net/if_ppp.h>
        !           151: #include <net/if_pppvar.h>
        !           152: 
        !           153: /* minimise diffs */
        !           154: #ifndef splsoftnet
        !           155: #define splsoftnet     splnet
        !           156: #endif
        !           157: 
        !           158: #if PPP_COMPRESS
        !           159: #define PACKETPTR      struct mbuf *
        !           160: #include <net/ppp_comp.h>
        !           161: #endif
        !           162: 
        !           163: struct ppp_softc ppp_softc[NPPP];
        !           164: 
        !           165: /* XXX layering violation */
        !           166: extern void    pppasyncattach __P((void *));
        !           167: 
        !           168: static void    pppattach __P((void *));
        !           169: PSEUDO_SET(pppattach, if_ppp);
        !           170: 
        !           171: static int     pppsioctl __P((struct ifnet *ifp, u_long cmd, caddr_t data));
        !           172: static void    pppintr __P((void));
        !           173: 
        !           174: static void    ppp_requeue __P((struct ppp_softc *));
        !           175: static void    ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd));
        !           176: static void    ppp_ccp_closed __P((struct ppp_softc *));
        !           177: static void    ppp_inproc __P((struct ppp_softc *, struct mbuf *));
        !           178: static void    pppdumpm __P((struct mbuf *m0));
        !           179: 
        !           180: /*
        !           181:  * Some useful mbuf macros not in mbuf.h.
        !           182:  */
        !           183: #define M_IS_CLUSTER(m)        ((m)->m_flags & M_EXT)
        !           184: 
        !           185: #define M_DATASTART(m) \
        !           186:        (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \
        !           187:            (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat)
        !           188: 
        !           189: #define M_DATASIZE(m)  \
        !           190:        (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \
        !           191:            (m)->m_flags & M_PKTHDR ? MHLEN: MLEN)
        !           192: 
        !           193: /*
        !           194:  * We steal two bits in the mbuf m_flags, to mark high-priority packets
        !           195:  * for output, and received packets following lost/corrupted packets.
        !           196:  */
        !           197: #define M_HIGHPRI      0x2000  /* output packet for sc_fastq */
        !           198: #define M_ERRMARK      0x4000  /* steal a bit in mbuf m_flags */
        !           199: 
        !           200: 
        !           201: #if PPP_COMPRESS
        !           202: /*
        !           203:  * List of compressors we know about.
        !           204:  * We leave some space so maybe we can modload compressors.
        !           205:  */
        !           206: 
        !           207: extern struct compressor ppp_bsd_compress;
        !           208: extern struct compressor ppp_deflate, ppp_deflate_draft;
        !           209: 
        !           210: static struct compressor *ppp_compressors[8] = {
        !           211: #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP)
        !           212:     &ppp_bsd_compress,
        !           213: #endif
        !           214: #if DO_DEFLATE && defined(PPP_DEFLATE)
        !           215:     &ppp_deflate,
        !           216:     &ppp_deflate_draft,
        !           217: #endif
        !           218:     NULL
        !           219: };
        !           220: #endif /* PPP_COMPRESS */
        !           221: 
        !           222: /*
        !           223:  * Called from boot code to establish ppp interfaces.
        !           224:  */
        !           225: static void
        !           226: pppattach(dummy)
        !           227:     void *dummy;
        !           228: {
        !           229:     register struct ppp_softc *sc;
        !           230:     register int i = 0;
        !           231: 
        !           232:     for (sc = ppp_softc; i < NPPP; sc++) {
        !           233:        sc->sc_if.if_name = "ppp";
        !           234:        sc->sc_if.if_family = APPLE_IF_FAM_PPP;
        !           235:        sc->sc_if.if_unit = i++;
        !           236:        sc->sc_if.if_mtu = PPP_MTU;
        !           237:        sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
        !           238:        sc->sc_if.if_type = IFT_PPP;
        !           239:        sc->sc_if.if_hdrlen = PPP_HDRLEN;
        !           240:        sc->sc_if.if_ioctl = pppsioctl;
        !           241:        sc->sc_if.if_output = pppoutput;
        !           242:        sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
        !           243:        sc->sc_inq.ifq_maxlen = IFQ_MAXLEN;
        !           244:        sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN;
        !           245:        sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN;
        !           246:        if_attach(&sc->sc_if);
        !           247: #if NBPFILTER > 0
        !           248:        bpfattach(&sc->sc_if, DLT_PPP, PPP_HDRLEN);
        !           249: #endif
        !           250:     }
        !           251:     register_netisr(NETISR_PPP, pppintr);
        !           252:     /*
        !           253:      * XXX layering violation - if_ppp can work over any lower level
        !           254:      * transport that cares to attach to it.
        !           255:      */
        !           256:     pppasyncattach(dummy);
        !           257: }
        !           258: 
        !           259: /*
        !           260:  * Allocate a ppp interface unit and initialize it.
        !           261:  */
        !           262: struct ppp_softc *
        !           263: pppalloc(pid)
        !           264:     pid_t pid;
        !           265: {
        !           266:     int nppp, i;
        !           267:     struct ppp_softc *sc;
        !           268: 
        !           269:     for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
        !           270:        if (sc->sc_xfer == pid) {
        !           271:            sc->sc_xfer = 0;
        !           272:            return sc;
        !           273:        }
        !           274:     for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
        !           275:        if (sc->sc_devp == NULL)
        !           276:            break;
        !           277:     if (nppp >= NPPP)
        !           278:        return NULL;
        !           279: 
        !           280:     sc->sc_flags = 0;
        !           281:     sc->sc_mru = PPP_MRU;
        !           282:     sc->sc_relinq = NULL;
        !           283:     bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats));
        !           284: #if VJC
        !           285:     MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress),
        !           286:           M_DEVBUF, M_NOWAIT);
        !           287:     if (sc->sc_comp)
        !           288:        sl_compress_init(sc->sc_comp, -1);
        !           289: #endif
        !           290: #if PPP_COMPRESS
        !           291:     sc->sc_xc_state = NULL;
        !           292:     sc->sc_rc_state = NULL;
        !           293: #endif /* PPP_COMPRESS */
        !           294:     for (i = 0; i < NUM_NP; ++i)
        !           295:        sc->sc_npmode[i] = NPMODE_ERROR;
        !           296:     sc->sc_npqueue = NULL;
        !           297:     sc->sc_npqtail = &sc->sc_npqueue;
        !           298:     sc->sc_last_sent = sc->sc_last_recv = time_second;
        !           299: 
        !           300:     return sc;
        !           301: }
        !           302: 
        !           303: /*
        !           304:  * Deallocate a ppp unit.  Must be called at splsoftnet or higher.
        !           305:  */
        !           306: void
        !           307: pppdealloc(sc)
        !           308:     struct ppp_softc *sc;
        !           309: {
        !           310:     struct mbuf *m;
        !           311: 
        !           312:     if_down(&sc->sc_if);
        !           313:     sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
        !           314:     getmicrotime(&sc->sc_if.if_lastchange);
        !           315:     sc->sc_devp = NULL;
        !           316:     sc->sc_xfer = 0;
        !           317:     for (;;) {
        !           318:        IF_DEQUEUE(&sc->sc_rawq, m);
        !           319:        if (m == NULL)
        !           320:            break;
        !           321:        m_freem(m);
        !           322:     }
        !           323:     for (;;) {
        !           324:        IF_DEQUEUE(&sc->sc_inq, m);
        !           325:        if (m == NULL)
        !           326:            break;
        !           327:        m_freem(m);
        !           328:     }
        !           329:     for (;;) {
        !           330:        IF_DEQUEUE(&sc->sc_fastq, m);
        !           331:        if (m == NULL)
        !           332:            break;
        !           333:        m_freem(m);
        !           334:     }
        !           335:     while ((m = sc->sc_npqueue) != NULL) {
        !           336:        sc->sc_npqueue = m->m_nextpkt;
        !           337:        m_freem(m);
        !           338:     }
        !           339: #if PPP_COMPRESS
        !           340:     ppp_ccp_closed(sc);
        !           341:     sc->sc_xc_state = NULL;
        !           342:     sc->sc_rc_state = NULL;
        !           343: #endif /* PPP_COMPRESS */
        !           344: #if PPP_FILTER
        !           345:     if (sc->sc_pass_filt.bf_insns != 0) {
        !           346:        FREE(sc->sc_pass_filt.bf_insns, M_DEVBUF);
        !           347:        sc->sc_pass_filt.bf_insns = 0;
        !           348:        sc->sc_pass_filt.bf_len = 0;
        !           349:     }
        !           350:     if (sc->sc_active_filt.bf_insns != 0) {
        !           351:        FREE(sc->sc_active_filt.bf_insns, M_DEVBUF);
        !           352:        sc->sc_active_filt.bf_insns = 0;
        !           353:        sc->sc_active_filt.bf_len = 0;
        !           354:     }
        !           355: #endif /* PPP_FILTER */
        !           356: #if VJC
        !           357:     if (sc->sc_comp != 0) {
        !           358:        FREE(sc->sc_comp, M_DEVBUF);
        !           359:        sc->sc_comp = 0;
        !           360:     }
        !           361: #endif
        !           362: }
        !           363: 
        !           364: /*
        !           365:  * Ioctl routine for generic ppp devices.
        !           366:  */
        !           367: int
        !           368: pppioctl(sc, cmd, data, flag, p)
        !           369:     struct ppp_softc *sc;
        !           370:     u_long cmd;
        !           371:     caddr_t data;
        !           372:     int flag;
        !           373:     struct proc *p;
        !           374: {
        !           375:     int s, error, flags, mru, nb, npx;
        !           376:     struct ppp_option_data *odp;
        !           377:     struct compressor **cp;
        !           378:     struct npioctl *npi;
        !           379:     time_t t;
        !           380: #if PPP_FILTER
        !           381:     struct bpf_program *bp, *nbp;
        !           382:     struct bpf_insn *newcode, *oldcode;
        !           383:     int newcodelen;
        !           384: #endif /* PPP_FILTER */
        !           385: #if    PPP_COMPRESS
        !           386:     u_char ccp_option[CCP_MAX_OPTION_LENGTH];
        !           387: #endif
        !           388: 
        !           389:     switch (cmd) {
        !           390:     case FIONREAD:
        !           391:        *(int *)data = sc->sc_inq.ifq_len;
        !           392:        break;
        !           393: 
        !           394:     case PPPIOCGUNIT:
        !           395:        *(int *)data = sc->sc_if.if_unit;
        !           396:        break;
        !           397: 
        !           398:     case PPPIOCGFLAGS:
        !           399:        *(u_int *)data = sc->sc_flags;
        !           400:        break;
        !           401: 
        !           402:     case PPPIOCSFLAGS:
        !           403:        if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
        !           404:            return (error);
        !           405:        flags = *(int *)data & SC_MASK;
        !           406:        s = splsoftnet();
        !           407: #if PPP_COMPRESS
        !           408:        if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN))
        !           409:            ppp_ccp_closed(sc);
        !           410: #endif
        !           411:        splimp();
        !           412:        sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags;
        !           413:        splx(s);
        !           414:        break;
        !           415: 
        !           416:     case PPPIOCSMRU:
        !           417:        if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
        !           418:            return (error);
        !           419:        mru = *(int *)data;
        !           420:        if (mru >= PPP_MRU && mru <= PPP_MAXMRU)
        !           421:            sc->sc_mru = mru;
        !           422:        break;
        !           423: 
        !           424:     case PPPIOCGMRU:
        !           425:        *(int *)data = sc->sc_mru;
        !           426:        break;
        !           427: 
        !           428: #if VJC
        !           429:     case PPPIOCSMAXCID:
        !           430:        if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
        !           431:            return (error);
        !           432:        if (sc->sc_comp) {
        !           433:            s = splsoftnet();
        !           434:            sl_compress_init(sc->sc_comp, *(int *)data);
        !           435:            splx(s);
        !           436:        }
        !           437:        break;
        !           438: #endif
        !           439: 
        !           440:     case PPPIOCXFERUNIT:
        !           441:        if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
        !           442:            return (error);
        !           443:        sc->sc_xfer = p->p_pid;
        !           444:        break;
        !           445: 
        !           446: #if PPP_COMPRESS
        !           447:     case PPPIOCSCOMPRESS:
        !           448:        if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
        !           449:            return (error);
        !           450:        odp = (struct ppp_option_data *) data;
        !           451:        nb = odp->length;
        !           452:        if (nb > sizeof(ccp_option))
        !           453:            nb = sizeof(ccp_option);
        !           454:        if ((error = copyin(odp->ptr, ccp_option, nb)) != 0)
        !           455:            return (error);
        !           456:        if (ccp_option[1] < 2)  /* preliminary check on the length byte */
        !           457:            return (EINVAL);
        !           458:        for (cp = ppp_compressors; *cp != NULL; ++cp)
        !           459:            if ((*cp)->compress_proto == ccp_option[0]) {
        !           460:                /*
        !           461:                 * Found a handler for the protocol - try to allocate
        !           462:                 * a compressor or decompressor.
        !           463:                 */
        !           464:                error = 0;
        !           465:                if (odp->transmit) {
        !           466:                    s = splsoftnet();
        !           467:                    if (sc->sc_xc_state != NULL)
        !           468:                        (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
        !           469:                    sc->sc_xcomp = *cp;
        !           470:                    sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb);
        !           471:                    if (sc->sc_xc_state == NULL) {
        !           472:                        if (sc->sc_flags & SC_DEBUG)
        !           473:                            printf("ppp%d: comp_alloc failed\n",
        !           474:                               sc->sc_if.if_unit);
        !           475:                        error = ENOBUFS;
        !           476:                    }
        !           477:                    splimp();
        !           478:                    sc->sc_flags &= ~SC_COMP_RUN;
        !           479:                    splx(s);
        !           480:                } else {
        !           481:                    s = splsoftnet();
        !           482:                    if (sc->sc_rc_state != NULL)
        !           483:                        (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
        !           484:                    sc->sc_rcomp = *cp;
        !           485:                    sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb);
        !           486:                    if (sc->sc_rc_state == NULL) {
        !           487:                        if (sc->sc_flags & SC_DEBUG)
        !           488:                            printf("ppp%d: decomp_alloc failed\n",
        !           489:                               sc->sc_if.if_unit);
        !           490:                        error = ENOBUFS;
        !           491:                    }
        !           492:                    splimp();
        !           493:                    sc->sc_flags &= ~SC_DECOMP_RUN;
        !           494:                    splx(s);
        !           495:                }
        !           496:                return (error);
        !           497:            }
        !           498:        if (sc->sc_flags & SC_DEBUG)
        !           499:            printf("ppp%d: no compressor for [%x %x %x], %x\n",
        !           500:                   sc->sc_if.if_unit, ccp_option[0], ccp_option[1],
        !           501:                   ccp_option[2], nb);
        !           502:        return (EINVAL);        /* no handler found */
        !           503: #endif /* PPP_COMPRESS */
        !           504: 
        !           505:     case PPPIOCGNPMODE:
        !           506:     case PPPIOCSNPMODE:
        !           507:        npi = (struct npioctl *) data;
        !           508:        switch (npi->protocol) {
        !           509:        case PPP_IP:
        !           510:            npx = NP_IP;
        !           511:            break;
        !           512:        default:
        !           513:            return EINVAL;
        !           514:        }
        !           515:        if (cmd == PPPIOCGNPMODE) {
        !           516:            npi->mode = sc->sc_npmode[npx];
        !           517:        } else {
        !           518:            if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
        !           519:                return (error);
        !           520:            if (npi->mode != sc->sc_npmode[npx]) {
        !           521:                s = splsoftnet();
        !           522:                sc->sc_npmode[npx] = npi->mode;
        !           523:                if (npi->mode != NPMODE_QUEUE) {
        !           524:                    ppp_requeue(sc);
        !           525:                    (*sc->sc_start)(sc);
        !           526:                }
        !           527:                splx(s);
        !           528:            }
        !           529:        }
        !           530:        break;
        !           531: 
        !           532:     case PPPIOCGIDLE:
        !           533:        s = splsoftnet();
        !           534:        t = time_second;
        !           535:        ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent;
        !           536:        ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv;
        !           537:        splx(s);
        !           538:        break;
        !           539: 
        !           540: #if PPP_FILTER
        !           541:     case PPPIOCSPASS:
        !           542:     case PPPIOCSACTIVE:
        !           543:        nbp = (struct bpf_program *) data;
        !           544:        if ((unsigned) nbp->bf_len > BPF_MAXINSNS)
        !           545:            return EINVAL;
        !           546:        newcodelen = nbp->bf_len * sizeof(struct bpf_insn);
        !           547:        if (newcodelen != 0) {
        !           548:            MALLOC(newcode, struct bpf_insn *, newcodelen, M_DEVBUF, M_WAITOK);
        !           549:            if (newcode == 0) {
        !           550:                return EINVAL;          /* or sumpin */
        !           551:            }
        !           552:            if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode,
        !           553:                               newcodelen)) != 0) {
        !           554:                FREE(newcode, M_DEVBUF);
        !           555:                return error;
        !           556:            }
        !           557:            if (!bpf_validate(newcode, nbp->bf_len)) {
        !           558:                FREE(newcode, M_DEVBUF);
        !           559:                return EINVAL;
        !           560:            }
        !           561:        } else
        !           562:            newcode = 0;
        !           563:        bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt;
        !           564:        oldcode = bp->bf_insns;
        !           565:        s = splimp();
        !           566:        bp->bf_len = nbp->bf_len;
        !           567:        bp->bf_insns = newcode;
        !           568:        splx(s);
        !           569:        if (oldcode != 0)
        !           570:            FREE(oldcode, M_DEVBUF);
        !           571:        break;
        !           572: #endif
        !           573: 
        !           574:     default:
        !           575:        return (ENOIOCTL);
        !           576:     }
        !           577:     return (0);
        !           578: }
        !           579: 
        !           580: /*
        !           581:  * Process an ioctl request to the ppp network interface.
        !           582:  */
        !           583: static int
        !           584: pppsioctl(ifp, cmd, data)
        !           585:     register struct ifnet *ifp;
        !           586:     u_long cmd;
        !           587:     caddr_t data;
        !           588: {
        !           589:     struct proc *p = current_proc();   /* XXX */
        !           590:     register struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
        !           591:     register struct ifaddr *ifa = (struct ifaddr *)data;
        !           592:     register struct ifreq *ifr = (struct ifreq *)data;
        !           593:     struct ppp_stats *psp;
        !           594: #if    PPP_COMPRESS
        !           595:     struct ppp_comp_stats *pcp;
        !           596: #endif
        !           597:     int s = splimp(), error = 0;
        !           598: 
        !           599:     switch (cmd) {
        !           600:     case SIOCSIFFLAGS:
        !           601:        if ((ifp->if_flags & IFF_RUNNING) == 0)
        !           602:            ifp->if_flags &= ~IFF_UP;
        !           603:        break;
        !           604: 
        !           605:     case SIOCSIFADDR:
        !           606:     case SIOCAIFADDR:
        !           607:        switch(ifa->ifa_addr->sa_family) {
        !           608: #if INET
        !           609:        case AF_INET:
        !           610:            break;
        !           611: #endif
        !           612: #if IPX
        !           613:        case AF_IPX:
        !           614:            break;
        !           615: #endif
        !           616:        default:
        !           617:            error = EAFNOSUPPORT;
        !           618:            break;
        !           619:        }
        !           620:        break;
        !           621: 
        !           622:     case SIOCSIFDSTADDR:
        !           623:        switch(ifa->ifa_addr->sa_family) {
        !           624: #if INET
        !           625:        case AF_INET:
        !           626:            break;
        !           627: #endif
        !           628: #if IPX
        !           629:        case AF_IPX:
        !           630:            break;
        !           631: #endif
        !           632:        default:
        !           633:            error = EAFNOSUPPORT;
        !           634:            break;
        !           635:        }
        !           636:        break;
        !           637: 
        !           638:     case SIOCSIFMTU:
        !           639:        if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
        !           640:            break;
        !           641:        if (ifr->ifr_mtu > PPP_MAXMTU)
        !           642:            error = EINVAL;
        !           643:        else {
        !           644:            sc->sc_if.if_mtu = ifr->ifr_mtu;
        !           645:            if (sc->sc_setmtu)
        !           646:                    (*sc->sc_setmtu)(sc);
        !           647:        }
        !           648:        break;
        !           649: 
        !           650:     case SIOCGIFMTU:
        !           651:        ifr->ifr_mtu = sc->sc_if.if_mtu;
        !           652:        break;
        !           653: 
        !           654:     case SIOCADDMULTI:
        !           655:     case SIOCDELMULTI:
        !           656:        if (ifr == 0) {
        !           657:            error = EAFNOSUPPORT;
        !           658:            break;
        !           659:        }
        !           660:        switch(ifr->ifr_addr.sa_family) {
        !           661: #if INET
        !           662:        case AF_INET:
        !           663:            break;
        !           664: #endif
        !           665:        default:
        !           666:            error = EAFNOSUPPORT;
        !           667:            break;
        !           668:        }
        !           669:        break;
        !           670: 
        !           671:     case SIOCGPPPSTATS:
        !           672:        psp = &((struct ifpppstatsreq *) data)->stats;
        !           673:        bzero(psp, sizeof(*psp));
        !           674:        psp->p = sc->sc_stats;
        !           675: #if defined(VJC) && !defined(SL_NO_STATS)
        !           676:        if (sc->sc_comp) {
        !           677:            psp->vj.vjs_packets = sc->sc_comp->sls_packets;
        !           678:            psp->vj.vjs_compressed = sc->sc_comp->sls_compressed;
        !           679:            psp->vj.vjs_searches = sc->sc_comp->sls_searches;
        !           680:            psp->vj.vjs_misses = sc->sc_comp->sls_misses;
        !           681:            psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin;
        !           682:            psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin;
        !           683:            psp->vj.vjs_errorin = sc->sc_comp->sls_errorin;
        !           684:            psp->vj.vjs_tossed = sc->sc_comp->sls_tossed;
        !           685:        }
        !           686: #endif /* VJC */
        !           687:        break;
        !           688: 
        !           689: #if PPP_COMPRESS
        !           690:     case SIOCGPPPCSTATS:
        !           691:        pcp = &((struct ifpppcstatsreq *) data)->stats;
        !           692:        bzero(pcp, sizeof(*pcp));
        !           693:        if (sc->sc_xc_state != NULL)
        !           694:            (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c);
        !           695:        if (sc->sc_rc_state != NULL)
        !           696:            (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d);
        !           697:        break;
        !           698: #endif /* PPP_COMPRESS */
        !           699: 
        !           700:     default:
        !           701:        error = ENOTTY;
        !           702:     }
        !           703:     splx(s);
        !           704:     return (error);
        !           705: }
        !           706: 
        !           707: /*
        !           708:  * Queue a packet.  Start transmission if not active.
        !           709:  * Packet is placed in Information field of PPP frame.
        !           710:  * Called at splnet as the if->if_output handler.
        !           711:  * Called at splnet from pppwrite().
        !           712:  */
        !           713: int
        !           714: pppoutput(ifp, m0, dst, rtp)
        !           715:     struct ifnet *ifp;
        !           716:     struct mbuf *m0;
        !           717:     struct sockaddr *dst;
        !           718:     struct rtentry *rtp;
        !           719: {
        !           720:     register struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
        !           721:     int protocol, address, control;
        !           722:     u_char *cp;
        !           723:     int s, error;
        !           724:     struct ip *ip;
        !           725:     struct ifqueue *ifq;
        !           726:     enum NPmode mode;
        !           727:     int len;
        !           728:     struct mbuf *m;
        !           729: 
        !           730:     if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0
        !           731:        || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) {
        !           732:        error = ENETDOWN;       /* sort of */
        !           733:        goto bad;
        !           734:     }
        !           735: 
        !           736:     /*
        !           737:      * Compute PPP header.
        !           738:      */
        !           739:     m0->m_flags &= ~M_HIGHPRI;
        !           740:     switch (dst->sa_family) {
        !           741: #if INET
        !           742:     case AF_INET:
        !           743:        address = PPP_ALLSTATIONS;
        !           744:        control = PPP_UI;
        !           745:        protocol = PPP_IP;
        !           746:        mode = sc->sc_npmode[NP_IP];
        !           747: 
        !           748:        /*
        !           749:         * If this packet has the "low delay" bit set in the IP header,
        !           750:         * put it on the fastq instead.
        !           751:         */
        !           752:        ip = mtod(m0, struct ip *);
        !           753:        if (ip->ip_tos & IPTOS_LOWDELAY)
        !           754:            m0->m_flags |= M_HIGHPRI;
        !           755:        break;
        !           756: #endif
        !           757: #if IPX
        !           758:     case AF_IPX:
        !           759:        /*
        !           760:         * This is pretty bogus.. We dont have an ipxcp module in pppd
        !           761:         * yet to configure the link parameters.  Sigh. I guess a
        !           762:         * manual ifconfig would do....  -Peter
        !           763:         */
        !           764:        address = PPP_ALLSTATIONS;
        !           765:        control = PPP_UI;
        !           766:        protocol = PPP_IPX;
        !           767:        mode = NPMODE_PASS;
        !           768:        break;
        !           769: #endif
        !           770:     case AF_UNSPEC:
        !           771:        address = PPP_ADDRESS(dst->sa_data);
        !           772:        control = PPP_CONTROL(dst->sa_data);
        !           773:        protocol = PPP_PROTOCOL(dst->sa_data);
        !           774:        mode = NPMODE_PASS;
        !           775:        break;
        !           776:     default:
        !           777:        printf("ppp%d: af%d not supported\n", ifp->if_unit, dst->sa_family);
        !           778:        error = EAFNOSUPPORT;
        !           779:        goto bad;
        !           780:     }
        !           781: 
        !           782:     /*
        !           783:      * Drop this packet, or return an error, if necessary.
        !           784:      */
        !           785:     if (mode == NPMODE_ERROR) {
        !           786:        error = ENETDOWN;
        !           787:        goto bad;
        !           788:     }
        !           789:     if (mode == NPMODE_DROP) {
        !           790:        error = 0;
        !           791:        goto bad;
        !           792:     }
        !           793: 
        !           794:     /*
        !           795:      * Add PPP header.  If no space in first mbuf, allocate another.
        !           796:      * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.)
        !           797:      */
        !           798:     if (M_LEADINGSPACE(m0) < PPP_HDRLEN) {
        !           799:        m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT);
        !           800:        if (m0 == 0) {
        !           801:            error = ENOBUFS;
        !           802:            goto bad;
        !           803:        }
        !           804:        m0->m_len = 0;
        !           805:     } else
        !           806:        m0->m_data -= PPP_HDRLEN;
        !           807: 
        !           808:     cp = mtod(m0, u_char *);
        !           809:     *cp++ = address;
        !           810:     *cp++ = control;
        !           811:     *cp++ = protocol >> 8;
        !           812:     *cp++ = protocol & 0xff;
        !           813:     m0->m_len += PPP_HDRLEN;
        !           814: 
        !           815:     len = 0;
        !           816:     for (m = m0; m != 0; m = m->m_next)
        !           817:        len += m->m_len;
        !           818: 
        !           819:     if (sc->sc_flags & SC_LOG_OUTPKT) {
        !           820:        printf("ppp%d output: ", ifp->if_unit);
        !           821:        pppdumpm(m0);
        !           822:     }
        !           823: 
        !           824:     if ((protocol & 0x8000) == 0) {
        !           825: #if PPP_FILTER
        !           826:        /*
        !           827:         * Apply the pass and active filters to the packet,
        !           828:         * but only if it is a data packet.
        !           829:         */
        !           830:        *mtod(m0, u_char *) = 1;        /* indicates outbound */
        !           831:        if (sc->sc_pass_filt.bf_insns != 0
        !           832:            && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0,
        !           833:                          len, 0) == 0) {
        !           834:            error = 0;          /* drop this packet */
        !           835:            goto bad;
        !           836:        }
        !           837: 
        !           838:        /*
        !           839:         * Update the time we sent the most recent packet.
        !           840:         */
        !           841:        if (sc->sc_active_filt.bf_insns == 0
        !           842:            || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0))
        !           843:            sc->sc_last_sent = time_second;
        !           844: 
        !           845:        *mtod(m0, u_char *) = address;
        !           846: #else
        !           847:        /*
        !           848:         * Update the time we sent the most recent data packet.
        !           849:         */
        !           850:        sc->sc_last_sent = time_second;
        !           851: #endif /* PPP_FILTER */
        !           852:     }
        !           853: 
        !           854: #if NBPFILTER > 0
        !           855:     /*
        !           856:      * See if bpf wants to look at the packet.
        !           857:      */
        !           858:     if (ifp->if_bpf)
        !           859:        bpf_mtap(ifp, m0);
        !           860: #endif
        !           861: 
        !           862:     /*
        !           863:      * Put the packet on the appropriate queue.
        !           864:      */
        !           865:     s = splsoftnet();  /* redundant */
        !           866:     if (mode == NPMODE_QUEUE) {
        !           867:        /* XXX we should limit the number of packets on this queue */
        !           868:        *sc->sc_npqtail = m0;
        !           869:        m0->m_nextpkt = NULL;
        !           870:        sc->sc_npqtail = &m0->m_nextpkt;
        !           871:     } else {
        !           872:        /* fastq and if_snd are emptied at spl[soft]net now */
        !           873:        ifq = (m0->m_flags & M_HIGHPRI)? &sc->sc_fastq: &ifp->if_snd;
        !           874:        if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) {
        !           875:            IF_DROP(ifq);
        !           876:            splx(s);
        !           877:            sc->sc_if.if_oerrors++;
        !           878:            sc->sc_stats.ppp_oerrors++;
        !           879:            error = ENOBUFS;
        !           880:            goto bad;
        !           881:        }
        !           882:        IF_ENQUEUE(ifq, m0);
        !           883:        (*sc->sc_start)(sc);
        !           884:     }
        !           885:     getmicrotime(&ifp->if_lastchange);
        !           886:     ifp->if_opackets++;
        !           887:     ifp->if_obytes += len;
        !           888: 
        !           889:     splx(s);
        !           890:     return (0);
        !           891: 
        !           892: bad:
        !           893:     m_freem(m0);
        !           894:     return (error);
        !           895: }
        !           896: 
        !           897: /*
        !           898:  * After a change in the NPmode for some NP, move packets from the
        !           899:  * npqueue to the send queue or the fast queue as appropriate.
        !           900:  * Should be called at spl[soft]net.
        !           901:  */
        !           902: static void
        !           903: ppp_requeue(sc)
        !           904:     struct ppp_softc *sc;
        !           905: {
        !           906:     struct mbuf *m, **mpp;
        !           907:     struct ifqueue *ifq;
        !           908:     enum NPmode mode;
        !           909: 
        !           910:     for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) {
        !           911:        switch (PPP_PROTOCOL(mtod(m, u_char *))) {
        !           912:        case PPP_IP:
        !           913:            mode = sc->sc_npmode[NP_IP];
        !           914:            break;
        !           915:        default:
        !           916:            mode = NPMODE_PASS;
        !           917:        }
        !           918: 
        !           919:        switch (mode) {
        !           920:        case NPMODE_PASS:
        !           921:            /*
        !           922:             * This packet can now go on one of the queues to be sent.
        !           923:             */
        !           924:            *mpp = m->m_nextpkt;
        !           925:            m->m_nextpkt = NULL;
        !           926:            ifq = (m->m_flags & M_HIGHPRI)? &sc->sc_fastq: &sc->sc_if.if_snd;
        !           927:            if (IF_QFULL(ifq)) {
        !           928:                IF_DROP(ifq);
        !           929:                sc->sc_if.if_oerrors++;
        !           930:                sc->sc_stats.ppp_oerrors++;
        !           931:            } else
        !           932:                IF_ENQUEUE(ifq, m);
        !           933:            break;
        !           934: 
        !           935:        case NPMODE_DROP:
        !           936:        case NPMODE_ERROR:
        !           937:            *mpp = m->m_nextpkt;
        !           938:            m_freem(m);
        !           939:            break;
        !           940: 
        !           941:        case NPMODE_QUEUE:
        !           942:            mpp = &m->m_nextpkt;
        !           943:            break;
        !           944:        }
        !           945:     }
        !           946:     sc->sc_npqtail = mpp;
        !           947: }
        !           948: 
        !           949: /*
        !           950:  * Transmitter has finished outputting some stuff;
        !           951:  * remember to call sc->sc_start later at splsoftnet.
        !           952:  */
        !           953: void
        !           954: ppp_restart(sc)
        !           955:     struct ppp_softc *sc;
        !           956: {
        !           957:     int s = splimp();
        !           958: 
        !           959:     sc->sc_flags &= ~SC_TBUSY;
        !           960:     schednetisr(NETISR_PPP);
        !           961:     splx(s);
        !           962: }
        !           963: 
        !           964: 
        !           965: /*
        !           966:  * Get a packet to send.  This procedure is intended to be called at
        !           967:  * splsoftnet, since it may involve time-consuming operations such as
        !           968:  * applying VJ compression, packet compression, address/control and/or
        !           969:  * protocol field compression to the packet.
        !           970:  */
        !           971: struct mbuf *
        !           972: ppp_dequeue(sc)
        !           973:     struct ppp_softc *sc;
        !           974: {
        !           975:     struct mbuf *m, *mp;
        !           976:     u_char *cp;
        !           977:     int address, control, protocol;
        !           978: 
        !           979:     /*
        !           980:      * Grab a packet to send: first try the fast queue, then the
        !           981:      * normal queue.
        !           982:      */
        !           983:     IF_DEQUEUE(&sc->sc_fastq, m);
        !           984:     if (m == NULL)
        !           985:        IF_DEQUEUE(&sc->sc_if.if_snd, m);
        !           986:     if (m == NULL)
        !           987:        return NULL;
        !           988: 
        !           989:     ++sc->sc_stats.ppp_opackets;
        !           990: 
        !           991:     /*
        !           992:      * Extract the ppp header of the new packet.
        !           993:      * The ppp header will be in one mbuf.
        !           994:      */
        !           995:     cp = mtod(m, u_char *);
        !           996:     address = PPP_ADDRESS(cp);
        !           997:     control = PPP_CONTROL(cp);
        !           998:     protocol = PPP_PROTOCOL(cp);
        !           999: 
        !          1000:     switch (protocol) {
        !          1001:     case PPP_IP:
        !          1002: #if VJC
        !          1003:        /*
        !          1004:         * If the packet is a TCP/IP packet, see if we can compress it.
        !          1005:         */
        !          1006:        if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) {
        !          1007:            struct ip *ip;
        !          1008:            int type;
        !          1009: 
        !          1010:            mp = m;
        !          1011:            ip = (struct ip *) (cp + PPP_HDRLEN);
        !          1012:            if (mp->m_len <= PPP_HDRLEN) {
        !          1013:                mp = mp->m_next;
        !          1014:                if (mp == NULL)
        !          1015:                    break;
        !          1016:                ip = mtod(mp, struct ip *);
        !          1017:            }
        !          1018:            /* this code assumes the IP/TCP header is in one non-shared mbuf */
        !          1019:            if (ip->ip_p == IPPROTO_TCP) {
        !          1020:                type = sl_compress_tcp(mp, ip, sc->sc_comp,
        !          1021:                                       !(sc->sc_flags & SC_NO_TCP_CCID));
        !          1022:                switch (type) {
        !          1023:                case TYPE_UNCOMPRESSED_TCP:
        !          1024:                    protocol = PPP_VJC_UNCOMP;
        !          1025:                    break;
        !          1026:                case TYPE_COMPRESSED_TCP:
        !          1027:                    protocol = PPP_VJC_COMP;
        !          1028:                    cp = mtod(m, u_char *);
        !          1029:                    cp[0] = address;    /* header has moved */
        !          1030:                    cp[1] = control;
        !          1031:                    cp[2] = 0;
        !          1032:                    break;
        !          1033:                }
        !          1034:                cp[3] = protocol;       /* update protocol in PPP header */
        !          1035:            }
        !          1036:        }
        !          1037: #endif /* VJC */
        !          1038:        break;
        !          1039: 
        !          1040: #if PPP_COMPRESS
        !          1041:     case PPP_CCP:
        !          1042:        ppp_ccp(sc, m, 0);
        !          1043:        break;
        !          1044: #endif /* PPP_COMPRESS */
        !          1045:     }
        !          1046: 
        !          1047: #if PPP_COMPRESS
        !          1048:     if (protocol != PPP_LCP && protocol != PPP_CCP
        !          1049:        && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) {
        !          1050:        struct mbuf *mcomp = NULL;
        !          1051:        int slen, clen;
        !          1052: 
        !          1053:        slen = 0;
        !          1054:        for (mp = m; mp != NULL; mp = mp->m_next)
        !          1055:            slen += mp->m_len;
        !          1056:        clen = (*sc->sc_xcomp->compress)
        !          1057:            (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN);
        !          1058:        if (mcomp != NULL) {
        !          1059:            if (sc->sc_flags & SC_CCP_UP) {
        !          1060:                /* Send the compressed packet instead of the original. */
        !          1061:                m_freem(m);
        !          1062:                m = mcomp;
        !          1063:                cp = mtod(m, u_char *);
        !          1064:                protocol = cp[3];
        !          1065:            } else {
        !          1066:                /* Can't transmit compressed packets until CCP is up. */
        !          1067:                m_freem(mcomp);
        !          1068:            }
        !          1069:        }
        !          1070:     }
        !          1071: #endif /* PPP_COMPRESS */
        !          1072: 
        !          1073:     /*
        !          1074:      * Compress the address/control and protocol, if possible.
        !          1075:      */
        !          1076:     if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS &&
        !          1077:        control == PPP_UI && protocol != PPP_ALLSTATIONS &&
        !          1078:        protocol != PPP_LCP) {
        !          1079:        /* can compress address/control */
        !          1080:        m->m_data += 2;
        !          1081:        m->m_len -= 2;
        !          1082:     }
        !          1083:     if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) {
        !          1084:        /* can compress protocol */
        !          1085:        if (mtod(m, u_char *) == cp) {
        !          1086:            cp[2] = cp[1];      /* move address/control up */
        !          1087:            cp[1] = cp[0];
        !          1088:        }
        !          1089:        ++m->m_data;
        !          1090:        --m->m_len;
        !          1091:     }
        !          1092: 
        !          1093:     return m;
        !          1094: }
        !          1095: 
        !          1096: /*
        !          1097:  * Software interrupt routine, called at spl[soft]net.
        !          1098:  */
        !          1099: static void
        !          1100: pppintr()
        !          1101: {
        !          1102:     struct ppp_softc *sc;
        !          1103:     int i, s;
        !          1104:     struct mbuf *m;
        !          1105: 
        !          1106:     sc = ppp_softc;
        !          1107:     for (i = 0; i < NPPP; ++i, ++sc) {
        !          1108:        s = splimp();
        !          1109:        if (!(sc->sc_flags & SC_TBUSY)
        !          1110:            && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head)) {
        !          1111:            sc->sc_flags |= SC_TBUSY;
        !          1112:            splx(s);
        !          1113:            (*sc->sc_start)(sc);
        !          1114:        } else
        !          1115:            splx(s);
        !          1116:        for (;;) {
        !          1117:            s = splimp();
        !          1118:            IF_DEQUEUE(&sc->sc_rawq, m);
        !          1119:            splx(s);
        !          1120:            if (m == NULL)
        !          1121:                break;
        !          1122:            ppp_inproc(sc, m);
        !          1123:        }
        !          1124:     }
        !          1125: }
        !          1126: 
        !          1127: #if PPP_COMPRESS
        !          1128: /*
        !          1129:  * Handle a CCP packet.  `rcvd' is 1 if the packet was received,
        !          1130:  * 0 if it is about to be transmitted.
        !          1131:  */
        !          1132: static void
        !          1133: ppp_ccp(sc, m, rcvd)
        !          1134:     struct ppp_softc *sc;
        !          1135:     struct mbuf *m;
        !          1136:     int rcvd;
        !          1137: {
        !          1138:     u_char *dp, *ep;
        !          1139:     struct mbuf *mp;
        !          1140:     int slen, s;
        !          1141: 
        !          1142:     /*
        !          1143:      * Get a pointer to the data after the PPP header.
        !          1144:      */
        !          1145:     if (m->m_len <= PPP_HDRLEN) {
        !          1146:        mp = m->m_next;
        !          1147:        if (mp == NULL)
        !          1148:            return;
        !          1149:        dp = (mp != NULL)? mtod(mp, u_char *): NULL;
        !          1150:     } else {
        !          1151:        mp = m;
        !          1152:        dp = mtod(mp, u_char *) + PPP_HDRLEN;
        !          1153:     }
        !          1154: 
        !          1155:     ep = mtod(mp, u_char *) + mp->m_len;
        !          1156:     if (dp + CCP_HDRLEN > ep)
        !          1157:        return;
        !          1158:     slen = CCP_LENGTH(dp);
        !          1159:     if (dp + slen > ep) {
        !          1160:        if (sc->sc_flags & SC_DEBUG)
        !          1161:            printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n",
        !          1162:                   dp, slen, mtod(mp, u_char *), mp->m_len);
        !          1163:        return;
        !          1164:     }
        !          1165: 
        !          1166:     switch (CCP_CODE(dp)) {
        !          1167:     case CCP_CONFREQ:
        !          1168:     case CCP_TERMREQ:
        !          1169:     case CCP_TERMACK:
        !          1170:        /* CCP must be going down - disable compression */
        !          1171:        if (sc->sc_flags & SC_CCP_UP) {
        !          1172:            s = splimp();
        !          1173:            sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN);
        !          1174:            splx(s);
        !          1175:        }
        !          1176:        break;
        !          1177: 
        !          1178:     case CCP_CONFACK:
        !          1179:        if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP)
        !          1180:            && slen >= CCP_HDRLEN + CCP_OPT_MINLEN
        !          1181:            && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) {
        !          1182:            if (!rcvd) {
        !          1183:                /* we're agreeing to send compressed packets. */
        !          1184:                if (sc->sc_xc_state != NULL
        !          1185:                    && (*sc->sc_xcomp->comp_init)
        !          1186:                        (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
        !          1187:                         sc->sc_if.if_unit, 0, sc->sc_flags & SC_DEBUG)) {
        !          1188:                    s = splimp();
        !          1189:                    sc->sc_flags |= SC_COMP_RUN;
        !          1190:                    splx(s);
        !          1191:                }
        !          1192:            } else {
        !          1193:                /* peer is agreeing to send compressed packets. */
        !          1194:                if (sc->sc_rc_state != NULL
        !          1195:                    && (*sc->sc_rcomp->decomp_init)
        !          1196:                        (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
        !          1197:                         sc->sc_if.if_unit, 0, sc->sc_mru,
        !          1198:                         sc->sc_flags & SC_DEBUG)) {
        !          1199:                    s = splimp();
        !          1200:                    sc->sc_flags |= SC_DECOMP_RUN;
        !          1201:                    sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR);
        !          1202:                    splx(s);
        !          1203:                }
        !          1204:            }
        !          1205:        }
        !          1206:        break;
        !          1207: 
        !          1208:     case CCP_RESETACK:
        !          1209:        if (sc->sc_flags & SC_CCP_UP) {
        !          1210:            if (!rcvd) {
        !          1211:                if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN))
        !          1212:                    (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state);
        !          1213:            } else {
        !          1214:                if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
        !          1215:                    (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state);
        !          1216:                    s = splimp();
        !          1217:                    sc->sc_flags &= ~SC_DC_ERROR;
        !          1218:                    splx(s);
        !          1219:                }
        !          1220:            }
        !          1221:        }
        !          1222:        break;
        !          1223:     }
        !          1224: }
        !          1225: 
        !          1226: /*
        !          1227:  * CCP is down; free (de)compressor state if necessary.
        !          1228:  */
        !          1229: static void
        !          1230: ppp_ccp_closed(sc)
        !          1231:     struct ppp_softc *sc;
        !          1232: {
        !          1233:     if (sc->sc_xc_state) {
        !          1234:        (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
        !          1235:        sc->sc_xc_state = NULL;
        !          1236:     }
        !          1237:     if (sc->sc_rc_state) {
        !          1238:        (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
        !          1239:        sc->sc_rc_state = NULL;
        !          1240:     }
        !          1241: }
        !          1242: #endif /* PPP_COMPRESS */
        !          1243: 
        !          1244: /*
        !          1245:  * PPP packet input routine.
        !          1246:  * The caller has checked and removed the FCS and has inserted
        !          1247:  * the address/control bytes and the protocol high byte if they
        !          1248:  * were omitted.
        !          1249:  */
        !          1250: void
        !          1251: ppppktin(sc, m, lost)
        !          1252:     struct ppp_softc *sc;
        !          1253:     struct mbuf *m;
        !          1254:     int lost;
        !          1255: {
        !          1256:     int s = splimp();
        !          1257: 
        !          1258:     if (lost)
        !          1259:        m->m_flags |= M_ERRMARK;
        !          1260:     IF_ENQUEUE(&sc->sc_rawq, m);
        !          1261:     schednetisr(NETISR_PPP);
        !          1262:     splx(s);
        !          1263: }
        !          1264: 
        !          1265: /*
        !          1266:  * Process a received PPP packet, doing decompression as necessary.
        !          1267:  * Should be called at splsoftnet.
        !          1268:  */
        !          1269: #define COMPTYPE(proto)        ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \
        !          1270:                         TYPE_UNCOMPRESSED_TCP)
        !          1271: 
        !          1272: static void
        !          1273: ppp_inproc(sc, m)
        !          1274:     struct ppp_softc *sc;
        !          1275:     struct mbuf *m;
        !          1276: {
        !          1277:     struct ifnet *ifp = &sc->sc_if;
        !          1278:     struct ifqueue *inq;
        !          1279:     int s, ilen = 0, xlen, proto, rv;
        !          1280:     u_char *cp, adrs, ctrl;
        !          1281:     struct mbuf *mp, *dmp = NULL;
        !          1282:     u_char *iphdr;
        !          1283:     u_int hlen;
        !          1284: 
        !          1285:     sc->sc_stats.ppp_ipackets++;
        !          1286: 
        !          1287:     if (sc->sc_flags & SC_LOG_INPKT) {
        !          1288:        ilen = 0;
        !          1289:        for (mp = m; mp != NULL; mp = mp->m_next)
        !          1290:            ilen += mp->m_len;
        !          1291:        printf("ppp%d: got %d bytes\n", ifp->if_unit, ilen);
        !          1292:        pppdumpm(m);
        !          1293:     }
        !          1294: 
        !          1295:     cp = mtod(m, u_char *);
        !          1296:     adrs = PPP_ADDRESS(cp);
        !          1297:     ctrl = PPP_CONTROL(cp);
        !          1298:     proto = PPP_PROTOCOL(cp);
        !          1299: 
        !          1300:     if (m->m_flags & M_ERRMARK) {
        !          1301:        m->m_flags &= ~M_ERRMARK;
        !          1302:        s = splimp();
        !          1303:        sc->sc_flags |= SC_VJ_RESET;
        !          1304:        splx(s);
        !          1305:     }
        !          1306: 
        !          1307: #if PPP_COMPRESS
        !          1308:     /*
        !          1309:      * Decompress this packet if necessary, update the receiver's
        !          1310:      * dictionary, or take appropriate action on a CCP packet.
        !          1311:      */
        !          1312:     if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)
        !          1313:        && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) {
        !          1314:        /* decompress this packet */
        !          1315:        rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp);
        !          1316:        if (rv == DECOMP_OK) {
        !          1317:            m_freem(m);
        !          1318:            if (dmp == NULL) {
        !          1319:                /* no error, but no decompressed packet produced */
        !          1320:                return;
        !          1321:            }
        !          1322:            m = dmp;
        !          1323:            cp = mtod(m, u_char *);
        !          1324:            proto = PPP_PROTOCOL(cp);
        !          1325: 
        !          1326:        } else {
        !          1327:            /*
        !          1328:             * An error has occurred in decompression.
        !          1329:             * Pass the compressed packet up to pppd, which may take
        !          1330:             * CCP down or issue a Reset-Req.
        !          1331:             */
        !          1332:            if (sc->sc_flags & SC_DEBUG)
        !          1333:                printf("ppp%d: decompress failed %d\n", ifp->if_unit, rv);
        !          1334:            s = splimp();
        !          1335:            sc->sc_flags |= SC_VJ_RESET;
        !          1336:            if (rv == DECOMP_ERROR)
        !          1337:                sc->sc_flags |= SC_DC_ERROR;
        !          1338:            else
        !          1339:                sc->sc_flags |= SC_DC_FERROR;
        !          1340:            splx(s);
        !          1341:        }
        !          1342: 
        !          1343:     } else {
        !          1344:        if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
        !          1345:            (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m);
        !          1346:        }
        !          1347:        if (proto == PPP_CCP) {
        !          1348:            ppp_ccp(sc, m, 1);
        !          1349:        }
        !          1350:     }
        !          1351: #endif
        !          1352: 
        !          1353:     ilen = 0;
        !          1354:     for (mp = m; mp != NULL; mp = mp->m_next)
        !          1355:        ilen += mp->m_len;
        !          1356: 
        !          1357: #if VJC
        !          1358:     if (sc->sc_flags & SC_VJ_RESET) {
        !          1359:        /*
        !          1360:         * If we've missed a packet, we must toss subsequent compressed
        !          1361:         * packets which don't have an explicit connection ID.
        !          1362:         */
        !          1363:        if (sc->sc_comp)
        !          1364:            sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp);
        !          1365:        s = splimp();
        !          1366:        sc->sc_flags &= ~SC_VJ_RESET;
        !          1367:        splx(s);
        !          1368:     }
        !          1369: 
        !          1370:     /*
        !          1371:      * See if we have a VJ-compressed packet to uncompress.
        !          1372:      */
        !          1373:     if (proto == PPP_VJC_COMP) {
        !          1374:        if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
        !          1375:            goto bad;
        !          1376: 
        !          1377:        xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
        !          1378:                                      ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP,
        !          1379:                                      sc->sc_comp, &iphdr, &hlen);
        !          1380: 
        !          1381:        if (xlen <= 0) {
        !          1382:            if (sc->sc_flags & SC_DEBUG)
        !          1383:                printf("ppp%d: VJ uncompress failed on type comp\n",
        !          1384:                        ifp->if_unit);
        !          1385:            goto bad;
        !          1386:        }
        !          1387: 
        !          1388:        /* Copy the PPP and IP headers into a new mbuf. */
        !          1389:        MGETHDR(mp, M_DONTWAIT, MT_DATA);
        !          1390:        if (mp == NULL)
        !          1391:            goto bad;
        !          1392:        mp->m_len = 0;
        !          1393:        mp->m_next = NULL;
        !          1394:        if (hlen + PPP_HDRLEN > MHLEN) {
        !          1395:            MCLGET(mp, M_DONTWAIT);
        !          1396:            if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) {
        !          1397:                m_freem(mp);
        !          1398:                goto bad;       /* lose if big headers and no clusters */
        !          1399:            }
        !          1400:        }
        !          1401:        cp = mtod(mp, u_char *);
        !          1402:        cp[0] = adrs;
        !          1403:        cp[1] = ctrl;
        !          1404:        cp[2] = 0;
        !          1405:        cp[3] = PPP_IP;
        !          1406:        proto = PPP_IP;
        !          1407:        bcopy(iphdr, cp + PPP_HDRLEN, hlen);
        !          1408:        mp->m_len = hlen + PPP_HDRLEN;
        !          1409: 
        !          1410:        /*
        !          1411:         * Trim the PPP and VJ headers off the old mbuf
        !          1412:         * and stick the new and old mbufs together.
        !          1413:         */
        !          1414:        m->m_data += PPP_HDRLEN + xlen;
        !          1415:        m->m_len -= PPP_HDRLEN + xlen;
        !          1416:        if (m->m_len <= M_TRAILINGSPACE(mp)) {
        !          1417:            bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len);
        !          1418:            mp->m_len += m->m_len;
        !          1419:            MFREE(m, mp->m_next);
        !          1420:        } else
        !          1421:            mp->m_next = m;
        !          1422:        m = mp;
        !          1423:        ilen += hlen - xlen;
        !          1424: 
        !          1425:     } else if (proto == PPP_VJC_UNCOMP) {
        !          1426:        if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
        !          1427:            goto bad;
        !          1428: 
        !          1429:        xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
        !          1430:                                      ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP,
        !          1431:                                      sc->sc_comp, &iphdr, &hlen);
        !          1432: 
        !          1433:        if (xlen < 0) {
        !          1434:            if (sc->sc_flags & SC_DEBUG)
        !          1435:                printf("ppp%d: VJ uncompress failed on type uncomp\n",
        !          1436:                        ifp->if_unit);
        !          1437:            goto bad;
        !          1438:        }
        !          1439: 
        !          1440:        proto = PPP_IP;
        !          1441:        cp[3] = PPP_IP;
        !          1442:     }
        !          1443: #endif /* VJC */
        !          1444: 
        !          1445:     /*
        !          1446:      * If the packet will fit in a header mbuf, don't waste a
        !          1447:      * whole cluster on it.
        !          1448:      */
        !          1449:     if (ilen <= MHLEN && M_IS_CLUSTER(m)) {
        !          1450:        MGETHDR(mp, M_DONTWAIT, MT_DATA);
        !          1451:        if (mp != NULL) {
        !          1452:            m_copydata(m, 0, ilen, mtod(mp, caddr_t));
        !          1453:            m_freem(m);
        !          1454:            m = mp;
        !          1455:            m->m_len = ilen;
        !          1456:        }
        !          1457:     }
        !          1458:     m->m_pkthdr.len = ilen;
        !          1459:     m->m_pkthdr.rcvif = ifp;
        !          1460: 
        !          1461:     if ((proto & 0x8000) == 0) {
        !          1462: #if PPP_FILTER
        !          1463:        /*
        !          1464:         * See whether we want to pass this packet, and
        !          1465:         * if it counts as link activity.
        !          1466:         */
        !          1467:        adrs = *mtod(m, u_char *);      /* save address field */
        !          1468:        *mtod(m, u_char *) = 0;         /* indicate inbound */
        !          1469:        if (sc->sc_pass_filt.bf_insns != 0
        !          1470:            && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m,
        !          1471:                          ilen, 0) == 0) {
        !          1472:            /* drop this packet */
        !          1473:            m_freem(m);
        !          1474:            return;
        !          1475:        }
        !          1476:        if (sc->sc_active_filt.bf_insns == 0
        !          1477:            || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0))
        !          1478:            sc->sc_last_recv = time_second;
        !          1479: 
        !          1480:        *mtod(m, u_char *) = adrs;
        !          1481: #else
        !          1482:        /*
        !          1483:         * Record the time that we received this packet.
        !          1484:         */
        !          1485:        sc->sc_last_recv = time_second;
        !          1486: #endif /* PPP_FILTER */
        !          1487:     }
        !          1488: 
        !          1489: #if NBPFILTER > 0
        !          1490:     /* See if bpf wants to look at the packet. */
        !          1491:     if (sc->sc_if.if_bpf)
        !          1492:        bpf_mtap(&sc->sc_if, m);
        !          1493: #endif
        !          1494: 
        !          1495:     rv = 0;
        !          1496:     switch (proto) {
        !          1497: #if INET
        !          1498:     case PPP_IP:
        !          1499:        /*
        !          1500:         * IP packet - take off the ppp header and pass it up to IP.
        !          1501:         */
        !          1502:        if ((ifp->if_flags & IFF_UP) == 0
        !          1503:            || sc->sc_npmode[NP_IP] != NPMODE_PASS) {
        !          1504:            /* interface is down - drop the packet. */
        !          1505:            m_freem(m);
        !          1506:            return;
        !          1507:        }
        !          1508:        m->m_pkthdr.len -= PPP_HDRLEN;
        !          1509:        m->m_data += PPP_HDRLEN;
        !          1510:        m->m_len -= PPP_HDRLEN;
        !          1511:        if (ipflow_fastforward(m)) {
        !          1512:            sc->sc_last_recv = time_second;
        !          1513:            return;
        !          1514:        }
        !          1515:        schednetisr(NETISR_IP);
        !          1516:        inq = &ipintrq;
        !          1517:        sc->sc_last_recv = time_second; /* update time of last pkt rcvd */
        !          1518:        break;
        !          1519: #endif
        !          1520: #if IPX
        !          1521:     case PPP_IPX:
        !          1522:        /*
        !          1523:         * IPX packet - take off the ppp header and pass it up to IPX.
        !          1524:         */
        !          1525:        if ((sc->sc_if.if_flags & IFF_UP) == 0
        !          1526:            /* XXX: || sc->sc_npmode[NP_IPX] != NPMODE_PASS*/) {
        !          1527:            /* interface is down - drop the packet. */
        !          1528:            m_freem(m);
        !          1529:            return;
        !          1530:        }
        !          1531:        m->m_pkthdr.len -= PPP_HDRLEN;
        !          1532:        m->m_data += PPP_HDRLEN;
        !          1533:        m->m_len -= PPP_HDRLEN;
        !          1534:        schednetisr(NETISR_IPX);
        !          1535:        inq = &ipxintrq;
        !          1536:        sc->sc_last_recv = time_second; /* update time of last pkt rcvd */
        !          1537:        break;
        !          1538: #endif
        !          1539: 
        !          1540:     default:
        !          1541:        /*
        !          1542:         * Some other protocol - place on input queue for read().
        !          1543:         */
        !          1544:        inq = &sc->sc_inq;
        !          1545:        rv = 1;
        !          1546:        break;
        !          1547:     }
        !          1548: 
        !          1549:     /*
        !          1550:      * Put the packet on the appropriate input queue.
        !          1551:      */
        !          1552:     s = splimp();
        !          1553:     if (IF_QFULL(inq)) {
        !          1554:        IF_DROP(inq);
        !          1555:        splx(s);
        !          1556:        if (sc->sc_flags & SC_DEBUG)
        !          1557:            printf("ppp%d: input queue full\n", ifp->if_unit);
        !          1558:        ifp->if_iqdrops++;
        !          1559:        goto bad;
        !          1560:     }
        !          1561:     IF_ENQUEUE(inq, m);
        !          1562:     splx(s);
        !          1563:     ifp->if_ipackets++;
        !          1564:     ifp->if_ibytes += ilen;
        !          1565:     getmicrotime(&ifp->if_lastchange);
        !          1566: 
        !          1567:     if (rv)
        !          1568:        (*sc->sc_ctlp)(sc);
        !          1569: 
        !          1570:     return;
        !          1571: 
        !          1572:  bad:
        !          1573:     m_freem(m);
        !          1574:     sc->sc_if.if_ierrors++;
        !          1575:     sc->sc_stats.ppp_ierrors++;
        !          1576: }
        !          1577: 
        !          1578: #define MAX_DUMP_BYTES 128
        !          1579: 
        !          1580: static void
        !          1581: pppdumpm(m0)
        !          1582:     struct mbuf *m0;
        !          1583: {
        !          1584:     char buf[3*MAX_DUMP_BYTES+4];
        !          1585:     char *bp = buf;
        !          1586:     struct mbuf *m;
        !          1587: 
        !          1588:     for (m = m0; m; m = m->m_next) {
        !          1589:        int l = m->m_len;
        !          1590:        u_char *rptr = (u_char *)m->m_data;
        !          1591: 
        !          1592:        while (l--) {
        !          1593:            if (bp > buf + sizeof(buf) - 4)
        !          1594:                goto done;
        !          1595:            *bp++ = hex2ascii(*rptr >> 4);
        !          1596:            *bp++ = hex2ascii(*rptr++ & 0xf);
        !          1597:        }
        !          1598: 
        !          1599:        if (m->m_next) {
        !          1600:            if (bp > buf + sizeof(buf) - 3)
        !          1601:                goto done;
        !          1602:            *bp++ = '|';
        !          1603:        } else
        !          1604:            *bp++ = ' ';
        !          1605:     }
        !          1606: done:
        !          1607:     if (m)
        !          1608:        *bp++ = '>';
        !          1609:     *bp = 0;
        !          1610:     printf("%s\n", buf);
        !          1611: }
        !          1612: 
        !          1613: #endif /* NPPP > 0 */

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