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Annotation of kernel/bsd/netat/aurp_open.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*
        !            26:  *     Copyright (c) 1996 Apple Computer, Inc. 
        !            27:  *
        !            28:  *     The information contained herein is subject to change without
        !            29:  *     notice and  should not be  construed as a commitment by Apple
        !            30:  *     Computer, Inc. Apple Computer, Inc. assumes no responsibility
        !            31:  *     for any errors that may appear.
        !            32:  *
        !            33:  *     Confidential and Proprietary to Apple Computer, Inc.
        !            34:  *
        !            35:  *     File: open.c
        !            36:  */
        !            37: #include <sysglue.h>
        !            38: #include <at/appletalk.h>
        !            39: #include <lap.h>
        !            40: #include <routing_tables.h>
        !            41: #define _AURP
        !            42: #include <at_aurp.h>
        !            43: #include <at/aurp.h>
        !            44: 
        !            45: /* */
        !            46: void AURPsndOpenReq(state)
        !            47:        aurp_state_t *state;
        !            48: {
        !            49:        int msize;
        !            50:        gbuf_t *m;
        !            51:        aurp_hdr_t *hdrp;
        !            52:        char *datp;
        !            53: 
        !            54:        if (aurp_gref == 0)
        !            55:                return;
        !            56:        if (state->rcv_retry && (state->rcv_state != AURPSTATE_WaitingForOpenRsp))
        !            57:                return;
        !            58: 
        !            59:        /* stop trying if the retry count exceeds the maximum value */
        !            60:        if (++state->rcv_retry > AURP_MaxRetry) {
        !            61:                dPrintf(D_M_AURP, D_L_WARNING,
        !            62:                        ("AURPsndOpenReq: no response, %d\n", state->rem_node));
        !            63:                state->rcv_state = AURPSTATE_Unconnected;
        !            64:                state->rcv_tmo = 0;
        !            65:                state->rcv_retry = 0;
        !            66:                return;
        !            67:        }
        !            68: 
        !            69:        msize = sizeof(aurp_hdr_t) + 3;
        !            70:        if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
        !            71:                gbuf_wset(m,msize);
        !            72: 
        !            73:                /* construct the open request packet */
        !            74:                hdrp = (aurp_hdr_t *)gbuf_rptr(m);
        !            75:                if (state->rcv_retry > 1)
        !            76:                        hdrp->connection_id = state->rcv_connection_id;
        !            77:                else {
        !            78:                        if (++rcv_connection_id == 0)
        !            79:                                rcv_connection_id = 1;
        !            80:                        hdrp->connection_id = rcv_connection_id;
        !            81:                }
        !            82:                hdrp->sequence_number = 0;
        !            83:                hdrp->command_code = AURPCMD_OpenReq;
        !            84:                hdrp->flags = (AURPFLG_NA | AURPFLG_ND | AURPFLG_NDC | AURPFLG_ZC);
        !            85:                *(short *)(hdrp+1) = AURP_Version;
        !            86:                ((char *)(hdrp+1))[2] = 0; /* option count */
        !            87: 
        !            88:                /* update state info */
        !            89:                state->rcv_connection_id = hdrp->connection_id;
        !            90:                state->rcv_state = AURPSTATE_WaitingForOpenRsp;
        !            91: 
        !            92:                /* send the packet */
        !            93:                AURPsend(m, AUD_AURP, state->rem_node);
        !            94:        }
        !            95: 
        !            96:        /* start the retry timer */
        !            97:        state->rcv_tmo = (void *)atalk_timeout(
        !            98:                AURPsndOpenReq, state, AURP_RetryInterval*HZ);
        !            99: }
        !           100: 
        !           101: /* */
        !           102: void AURPrcvOpenReq(state, m)
        !           103:        aurp_state_t *state;
        !           104:        gbuf_t *m;
        !           105: {
        !           106:        short rc, version;
        !           107:        aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
        !           108:        unsigned short sui = hdrp->flags;
        !           109: 
        !           110:        /* make sure we're in a valid state to accept it */
        !           111:        if ((update_tmo == 0) || ((state->snd_state != AURPSTATE_Unconnected) &&
        !           112:                        (state->snd_state != AURPSTATE_Connected))) {
        !           113:                dPrintf(D_M_AURP, D_L_WARNING,
        !           114:                        ("AURPrcvOpenReq: unexpected request\n"));
        !           115:                gbuf_freem(m);
        !           116:                return;
        !           117:        }
        !           118: 
        !           119:        /* check for the correct version number */
        !           120:        version = *(short *)(hdrp+1);
        !           121:        if (version != AURP_Version) {
        !           122:                dPrintf(D_M_AURP, D_L_WARNING,
        !           123:                        ("AURPrcvOpenReq: invalid version number %d\n"));
        !           124:                rc = AURPERR_InvalidVersionNumber;
        !           125:        } else
        !           126:                rc = (short)AURP_UpdateRate;
        !           127: 
        !           128:        /* construct the open response packet */
        !           129:        gbuf_wset(m,sizeof(aurp_hdr_t)+sizeof(short));
        !           130:        hdrp->command_code = AURPCMD_OpenRsp;
        !           131:        hdrp->flags = 0;
        !           132:        *(short *)(hdrp+1) = rc;
        !           133:        ((char *)(hdrp+1))[2] = 0; /* option count */
        !           134: 
        !           135:        /*
        !           136:         * reset if we're in the Connected state and this is
        !           137:         * a completely new open request
        !           138:         */
        !           139:        if ((state->snd_state == AURPSTATE_Connected) &&
        !           140:                ((state->snd_connection_id != hdrp->connection_id) ||
        !           141:                        (state->snd_sequence_number != AURP_FirstSeqNum))) {
        !           142:                extern void AURPsndTickle();
        !           143:                if (state->rcv_state == AURPSTATE_Connected) {
        !           144:                        state->rcv_state = AURPSTATE_Unconnected;
        !           145:                        atalk_untimeout(AURPsndTickle, state, 0);
        !           146:                }
        !           147:                state->snd_state = AURPSTATE_Unconnected;
        !           148:                AURPcleanup(state);
        !           149:                AURPpurgeri(state->rem_node);
        !           150:        }
        !           151: 
        !           152:        /* update state info */
        !           153:        if (state->snd_state == AURPSTATE_Unconnected) {
        !           154:                state->snd_state = AURPSTATE_Connected;
        !           155:                state->snd_sui = sui;
        !           156:                state->snd_connection_id = hdrp->connection_id;
        !           157:                state->snd_sequence_number = AURP_FirstSeqNum;
        !           158:        }
        !           159: 
        !           160:        /* send the packet */
        !           161:        AURPsend(m, AUD_AURP, state->rem_node);
        !           162: 
        !           163:        /* open connection for the data receiver side if not yet connected */
        !           164:        if (state->rcv_state == AURPSTATE_Unconnected) {
        !           165:                state->rcv_retry = 0;
        !           166:                state->tickle_retry = 0;
        !           167:                state->rcv_sequence_number = 0;
        !           168:                AURPsndOpenReq(state);
        !           169:        }
        !           170: }
        !           171: 
        !           172: /* */
        !           173: void AURPrcvOpenRsp(state, m)
        !           174:        aurp_state_t *state;
        !           175:        gbuf_t *m;
        !           176: {
        !           177:        extern void AURPsndTickle();
        !           178:        short rc;
        !           179:        aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
        !           180: 
        !           181:        /* make sure we're in a valid state to accept it */
        !           182:        if (state->rcv_state != AURPSTATE_WaitingForOpenRsp) {
        !           183:                dPrintf(D_M_AURP, D_L_WARNING,
        !           184:                        ("AURPrcvOpenRsp: unexpected response\n"));
        !           185:                gbuf_freem(m);
        !           186:                return;
        !           187:        }
        !           188: 
        !           189:        /* check for the correct connection id */
        !           190:        if (hdrp->connection_id != state->rcv_connection_id) {
        !           191:                dPrintf(D_M_AURP, D_L_WARNING,
        !           192:                        ("AURPrcvOpenRsp: invalid connection id, r=%d, m=%d\n",
        !           193:                        hdrp->connection_id, state->rcv_connection_id));
        !           194:                gbuf_freem(m);
        !           195:                return;
        !           196:        }
        !           197: 
        !           198:        /* cancel the retry timer */
        !           199:        atalk_untimeout(AURPsndOpenReq, state, state->rcv_tmo);
        !           200:        state->rcv_tmo = 0;
        !           201:        state->rcv_retry = 0;
        !           202: 
        !           203:        /* update state info */
        !           204:        state->rcv_sequence_number = AURP_FirstSeqNum;
        !           205:        state->rcv_env = hdrp->flags;
        !           206: 
        !           207:        /* check for error */
        !           208:        rc = *(short *)(hdrp+1);
        !           209:        gbuf_freem(m);
        !           210:        if (rc < 0) {
        !           211:                dPrintf(D_M_AURP, D_L_WARNING,
        !           212:                        ("AURPrcvOpenRsp: error=%d\n", rc));
        !           213:                return;
        !           214:        }
        !           215: 
        !           216:        /* update state info */
        !           217:        state->rcv_update_rate = (unsigned short)rc;
        !           218:        state->rcv_state = AURPSTATE_Connected;
        !           219: 
        !           220:        /* start tickle */
        !           221:        atalk_timeout(AURPsndTickle, state, AURP_TickleRetryInterval*HZ);
        !           222: 
        !           223:        /* get routing info */
        !           224:        AURPsndRIReq(state);
        !           225: }

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