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Annotation of XNU/bsd/netccitt/llc_output.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:  * Copyright (C) Dirk Husemann, Computer Science Department IV, 
        !            24:  *              University of Erlangen-Nuremberg, Germany, 1990, 1991, 1992
        !            25:  * Copyright (c) 1992, 1993
        !            26:  *     The Regents of the University of California.  All rights reserved.
        !            27:  * 
        !            28:  * This code is derived from software contributed to Berkeley by
        !            29:  * Dirk Husemann and the Computer Science Department (IV) of
        !            30:  * the University of Erlangen-Nuremberg, Germany.
        !            31:  *
        !            32:  * Redistribution and use in source and binary forms, with or without
        !            33:  * modification, are permitted provided that the following conditions
        !            34:  * are met:
        !            35:  * 1. Redistributions of source code must retain the above copyright
        !            36:  *    notice, this list of conditions and the following disclaimer.
        !            37:  * 2. Redistributions in binary form must reproduce the above copyright
        !            38:  *    notice, this list of conditions and the following disclaimer in the
        !            39:  *    documentation and/or other materials provided with the distribution.
        !            40:  * 3. All advertising materials mentioning features or use of this software
        !            41:  *    must display the following acknowledgement:
        !            42:  *     This product includes software developed by the University of
        !            43:  *     California, Berkeley and its contributors.
        !            44:  * 4. Neither the name of the University nor the names of its contributors
        !            45:  *    may be used to endorse or promote products derived from this software
        !            46:  *    without specific prior written permission.
        !            47:  *
        !            48:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            49:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            50:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            51:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            52:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            53:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            54:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            55:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            56:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            57:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            58:  * SUCH DAMAGE.
        !            59:  *
        !            60:  *     @(#)llc_output.c        8.1 (Berkeley) 6/10/93
        !            61:  */
        !            62: 
        !            63: #include <sys/param.h>
        !            64: #include <sys/systm.h>
        !            65: #include <sys/mbuf.h>
        !            66: #include <sys/domain.h>
        !            67: #include <sys/socket.h>
        !            68: #include <sys/protosw.h>
        !            69: #include <sys/errno.h>
        !            70: #include <sys/time.h>
        !            71: #include <sys/kernel.h>
        !            72: 
        !            73: #include <net/if.h>
        !            74: #include <net/if_dl.h>
        !            75: #include <net/if_llc.h>
        !            76: #include <net/route.h>
        !            77: 
        !            78: #include <netccitt/dll.h>
        !            79: #include <netccitt/llc_var.h>
        !            80: 
        !            81: /*
        !            82:  * llc_output() --- called by an upper layer (network layer) entity whenever
        !            83:  *                  there is an INFO frame to be transmitted. We enqueue the
        !            84:  *                  info frame and call llc_start() to do the actual sending.
        !            85:  */
        !            86: 
        !            87: llc_output(struct llc_linkcb *linkp, struct mbuf *m)
        !            88: {
        !            89:        register int i;
        !            90: 
        !            91:        i = splimp();
        !            92:        LLC_ENQUEUE(linkp, m);
        !            93:        llc_start(linkp);
        !            94:        splx(i);
        !            95: 
        !            96: }
        !            97: 
        !            98: 
        !            99: /*
        !           100:  * llc_start() --- We try to subsequently dequeue all the frames available and
        !           101:  *                 send them out.
        !           102:  */
        !           103: void
        !           104: llc_start(struct llc_linkcb *linkp)
        !           105: {
        !           106:        register int i;
        !           107:        register struct mbuf *m;
        !           108:        int action;
        !           109: 
        !           110:        while ((LLC_STATEEQ(linkp, NORMAL) || LLC_STATEEQ(linkp, BUSY) ||
        !           111:                LLC_STATEEQ(linkp, REJECT)) && 
        !           112:               (linkp->llcl_slotsfree > 0) && 
        !           113:               (LLC_GETFLAG(linkp, REMOTE_BUSY) == 0)) {
        !           114:                LLC_DEQUEUE(linkp, m);
        !           115:                if (m == NULL)
        !           116:                        break;
        !           117:                LLC_SETFRAME(linkp, m);
        !           118:                (void)llc_statehandler(linkp, (struct llc *) 0, NL_DATA_REQUEST, 
        !           119:                                       0, 0);
        !           120:        }
        !           121: }
        !           122: 
        !           123: 
        !           124: /*
        !           125:  * llc_send() --- Handles single frames. If dealing with INFO frames we need to
        !           126:  *                prepend the LLC header, otherwise we just allocate an mbuf.
        !           127:  *                In both cases the actual send is done by llc_rawsend().
        !           128:  */
        !           129: llc_send(struct llc_linkcb *linkp, int frame_kind, int cmdrsp, int pollfinal)
        !           130: {
        !           131:        register struct mbuf *m = (struct mbuf *)0;
        !           132:        register struct llc *frame;
        !           133: 
        !           134:        if (frame_kind == LLCFT_INFO)
        !           135:                m = linkp->llcl_output_buffers[llc_seq2slot(linkp,
        !           136:                                                            linkp->llcl_vs)];
        !           137:        LLC_GETHDR(frame, m);
        !           138: 
        !           139:        /* pass it on to llc_rawsend() */
        !           140:        llc_rawsend(linkp, m, frame, frame_kind, linkp->llcl_vs, cmdrsp, pollfinal);
        !           141: 
        !           142:        if (frame_kind == LLCFT_INFO)
        !           143:                LLC_INC(linkp->llcl_vs);
        !           144: 
        !           145:        return 0;
        !           146: }
        !           147: 
        !           148: /* 
        !           149:  * llc_resend() --- llc_resend() retransmits all unacknowledged INFO frames.
        !           150:  */
        !           151: llc_resend(struct llc_linkcb *linkp, int cmdrsp, int pollfinal)
        !           152: {
        !           153:        register struct llc *frame;
        !           154:        register struct mbuf *m;
        !           155:        register int seq, slot;
        !           156: 
        !           157:        if (linkp->llcl_slotsfree < linkp->llcl_window)
        !           158:                /* assert lock between nr_received & V(S) */
        !           159:                if (linkp->llcl_nr_received != linkp->llcl_vs)
        !           160:                        panic("llc: V(S) != N(R) received\n");
        !           161: 
        !           162:                for (slot = llc_seq2slot(linkp, linkp->llcl_vs);
        !           163:                     slot != linkp->llcl_freeslot; 
        !           164:                     LLC_INC(linkp->llcl_vs), 
        !           165:                     slot = llc_seq2slot(linkp, linkp->llcl_vs)) {
        !           166:                        m = linkp->llcl_output_buffers[slot];
        !           167:                        LLC_GETHDR(frame, m);
        !           168:                        llc_rawsend(linkp, m, frame, LLCFT_INFO, linkp->llcl_vs, 
        !           169:                                    cmdrsp, pollfinal);
        !           170:                        pollfinal = 0;
        !           171:                }
        !           172:        
        !           173:        return 0;
        !           174: }
        !           175: 
        !           176: /*
        !           177:  * llc_rawsend() --- constructs an LLC frame and sends it out via the
        !           178:  *                   associated interface of the link control block.
        !           179:  *
        !           180:  * We need to make sure that outgoing frames have the correct length,
        !           181:  * in particular the 4 byte ones (RR, RNR, REJ) as LLC_GETHDR() will
        !           182:  * set the mbuf len to 3 as default len for non INFO frames ...
        !           183:  *
        !           184:  * Frame kind             Length (w/o MAC header, {D,S}SAP incl.)
        !           185:  * --------------------------------------------------------------
        !           186:  * DISC, SABME, UA, DM    3 bytes  ({D,S}SAP + CONTROL)
        !           187:  * RR, RNR, REJ           4 bytes  ({D,S}SAP + CONTROL0 + CONTROL1)
        !           188:  * XID                    6 bytes  ({D,S}SAP + CONTROL0 + FI,CLASS,WINDOW)
        !           189:  * FRMR                   7 bytes  ({D,S}SAP + CONTROL0 + REJ CONTROL,V(S),V(R),CAUSE)
        !           190:  * INFO                   4 -- MTU
        !           191:  * UI, TEST               3 -- MTU
        !           192:  *
        !           193:  */
        !           194: #define LLC_SETLEN(m, l) (m)->m_pkthdr.len = (m)->m_len = (l)
        !           195: 
        !           196: llc_rawsend(struct llc_linkcb *linkp, struct mbuf *m, struct llc *frame,
        !           197:            int frame_kind, int vs, int cmdrsp, int pollfinal)
        !           198: {
        !           199:        register short adjust = LLC_UFRAMELEN;
        !           200:        struct ifnet *ifp;
        !           201: 
        !           202:        switch (frame_kind) {
        !           203:        /* supervisory and information frames */
        !           204:        case LLCFT_INFO:
        !           205:                frame->llc_control = LLC_INFO;
        !           206:                LLCSBITS(frame->llc_control, i_ns, vs);
        !           207:                LLCSBITS(frame->llc_control_ext, i_nr, linkp->llcl_vr);
        !           208:                adjust = LLC_ISFRAMELEN;
        !           209:                break;
        !           210:        case LLCFT_RR:
        !           211:                frame->llc_control = LLC_RR;
        !           212:                LLC_SETLEN(m, LLC_ISFRAMELEN);
        !           213:                LLCSBITS(frame->llc_control_ext, s_nr, linkp->llcl_vr);
        !           214:                adjust = LLC_ISFRAMELEN;
        !           215:                break;
        !           216:        case LLCFT_RNR:
        !           217:                frame->llc_control = LLC_RNR;
        !           218:                LLC_SETLEN(m, LLC_ISFRAMELEN);
        !           219:                LLCSBITS(frame->llc_control_ext, s_nr, linkp->llcl_vr);
        !           220:                adjust = LLC_ISFRAMELEN;
        !           221:                break;
        !           222:        case LLCFT_REJ:
        !           223:                frame->llc_control = LLC_REJ;
        !           224:                LLC_SETLEN(m, LLC_ISFRAMELEN);
        !           225:                LLCSBITS(frame->llc_control_ext, s_nr, linkp->llcl_vr);
        !           226:                adjust = LLC_ISFRAMELEN;
        !           227:                break;
        !           228:        /* unnumbered frames */
        !           229:        case LLCFT_DM:
        !           230:                frame->llc_control = LLC_DM;
        !           231:                break;
        !           232:        case LLCFT_SABME:
        !           233:                frame->llc_control = LLC_SABME;
        !           234:                break;
        !           235:        case LLCFT_DISC:
        !           236:                frame->llc_control = LLC_DISC;
        !           237:                break;
        !           238:        case LLCFT_UA:
        !           239:                frame->llc_control = LLC_UA;
        !           240:                break;
        !           241:        case LLCFT_UI:
        !           242:                frame->llc_control = LLC_UI;
        !           243:                break;
        !           244:        case LLCFT_FRMR:
        !           245:                frame->llc_control = LLC_FRMR;
        !           246:                /* get more space --- FRMR frame are longer then usual */
        !           247:                LLC_SETLEN(m, LLC_FRMRLEN);
        !           248:                bcopy((caddr_t) &linkp->llcl_frmrinfo, 
        !           249:                      (caddr_t) &frame->llc_frmrinfo,
        !           250:                      sizeof(struct frmrinfo));
        !           251:                break;
        !           252:        default:
        !           253:                /*
        !           254:                 * We don't send {XID, TEST} frames
        !           255:                 */
        !           256:                if (m)
        !           257:                        m_freem(m);
        !           258:                return;
        !           259:        }
        !           260:  
        !           261:        /* 
        !           262:         * Fill in DSAP/SSAP
        !           263:         */
        !           264:        frame->llc_dsap = frame->llc_ssap = LLSAPADDR(&linkp->llcl_addr);
        !           265:        frame->llc_ssap |= cmdrsp;
        !           266: 
        !           267:        /*
        !           268:         * Check for delayed action pending. ISO 8802-2, 7.9.2 (5)
        !           269:         * and ISO 8802-2, 7.9.2.3 (32), (34), (36) pertain to this
        !           270:         * piece of code --- hopefully we got it right here (i.e.
        !           271:         * in the spirit of (32), (34), and (36) ...
        !           272:         */
        !           273:        switch (frame_kind) {
        !           274:        case LLCFT_RR:
        !           275:        case LLCFT_RNR:
        !           276:        case LLCFT_REJ:
        !           277:        case LLCFT_INFO:
        !           278:                switch (LLC_GETFLAG(linkp, DACTION)) {
        !           279:                case LLC_DACKCMD:
        !           280:                case LLC_DACKRSP:
        !           281:                        LLC_STOPTIMER(linkp, DACTION);
        !           282:                        break;
        !           283:                case LLC_DACKCMDPOLL:
        !           284:                        if (cmdrsp == LLC_CMD) {
        !           285:                                pollfinal = 1;
        !           286:                                LLC_STOPTIMER(linkp, DACTION);
        !           287:                        }
        !           288:                        break;
        !           289:                case LLC_DACKRSPFINAL:
        !           290:                        if (cmdrsp == LLC_RSP) {
        !           291:                                pollfinal = 1;
        !           292:                                LLC_STOPTIMER(linkp, DACTION);
        !           293:                        }
        !           294:                        break;
        !           295:                }
        !           296:                break;
        !           297:        }
        !           298:         
        !           299:        if (adjust == LLC_UFRAMELEN)
        !           300:                LLCSBITS(frame->llc_control, u_pf, pollfinal);
        !           301:        else LLCSBITS(frame->llc_control_ext, s_pf, pollfinal);
        !           302: 
        !           303:        /*
        !           304:         * Get interface to send frame onto
        !           305:         */
        !           306:        ifp = linkp->llcl_if;
        !           307:        if (frame_kind == LLCFT_INFO) {
        !           308:                /* 
        !           309:                 * send out a copy of the frame, retain the
        !           310:                 * original
        !           311:                 */
        !           312:                (*ifp->if_output)(ifp, m_copy(m, 0, (int)M_COPYALL),
        !           313:                                  rt_key(linkp->llcl_nlrt),
        !           314:                                  linkp->llcl_nlrt);
        !           315:                /*
        !           316:                 * Account for the LLC header and let it ``disappear''
        !           317:                 * as the raw info frame payload is what we hold in
        !           318:                 * the output_buffers of the link.
        !           319:                 */
        !           320:                m_adj(m, LLC_ISFRAMELEN);
        !           321:        } else (*ifp->if_output)(ifp, m, 
        !           322:                                 rt_key(linkp->llcl_nlrt),
        !           323:                                 linkp->llcl_nlrt);
        !           324: }
        !           325: 

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