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Annotation of XNU/bsd/netat/aurp_open.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) 1996 Apple Computer, Inc. 
        !            24:  *
        !            25:  *             Created April 8, 1996 by Tuyen Nguyen
        !            26:  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
        !            27:  *
        !            28:  *     File: open.c
        !            29:  */
        !            30: #include <sys/errno.h>
        !            31: #include <sys/types.h>
        !            32: #include <sys/param.h>
        !            33: #include <machine/spl.h>
        !            34: #include <sys/systm.h>
        !            35: #include <sys/kernel.h>
        !            36: #include <sys/proc.h>
        !            37: #include <sys/filedesc.h>
        !            38: #include <sys/fcntl.h>
        !            39: #include <sys/mbuf.h>
        !            40: #include <sys/socket.h>
        !            41: #include <sys/socketvar.h>
        !            42: #include <net/if.h>
        !            43: 
        !            44: #include <netat/sysglue.h>
        !            45: #include <netat/appletalk.h>
        !            46: #include <netat/at_var.h>
        !            47: #include <netat/routing_tables.h>
        !            48: #include <netat/at_pcb.h>
        !            49: #include <netat/aurp.h>
        !            50: #include <netat/debug.h>
        !            51: 
        !            52: /* */
        !            53: void AURPsndOpenReq(state)
        !            54:        aurp_state_t *state;
        !            55: {
        !            56:        int msize;
        !            57:        gbuf_t *m;
        !            58:        aurp_hdr_t *hdrp;
        !            59: 
        !            60:        if (aurp_gref == 0)
        !            61:                return;
        !            62:        if (state->rcv_retry && (state->rcv_state != AURPSTATE_WaitingForOpenRsp))
        !            63:                return;
        !            64: 
        !            65:        /* stop trying if the retry count exceeds the maximum value */
        !            66:        if (++state->rcv_retry > AURP_MaxRetry) {
        !            67:                dPrintf(D_M_AURP, D_L_WARNING,
        !            68:                        ("AURPsndOpenReq: no response, node %u\n",
        !            69:                        state->rem_node));
        !            70:                state->rcv_state = AURPSTATE_Unconnected;
        !            71:                state->rcv_tmo = 0;
        !            72:                state->rcv_retry = 0;
        !            73:                return;
        !            74:        }
        !            75: 
        !            76:        msize = sizeof(aurp_hdr_t) + 3;
        !            77:        if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
        !            78:                gbuf_wset(m,msize);
        !            79: 
        !            80:                /* construct the open request packet */
        !            81:                hdrp = (aurp_hdr_t *)gbuf_rptr(m);
        !            82:                if (state->rcv_retry > 1)
        !            83:                        hdrp->connection_id = state->rcv_connection_id;
        !            84:                else {
        !            85:                        if (++rcv_connection_id == 0)
        !            86:                                rcv_connection_id = 1;
        !            87:                        hdrp->connection_id = rcv_connection_id;
        !            88:                }
        !            89:                hdrp->sequence_number = 0;
        !            90:                hdrp->command_code = AURPCMD_OpenReq;
        !            91:                hdrp->flags = (AURPFLG_NA | AURPFLG_ND | AURPFLG_NDC | AURPFLG_ZC);
        !            92:                *(short *)(hdrp+1) = AURP_Version;
        !            93:                ((char *)(hdrp+1))[2] = 0; /* option count */
        !            94: 
        !            95:                /* update state info */
        !            96:                state->rcv_connection_id = hdrp->connection_id;
        !            97:                state->rcv_state = AURPSTATE_WaitingForOpenRsp;
        !            98: 
        !            99:                /* send the packet */
        !           100:                dPrintf(D_M_AURP, D_L_TRACE,
        !           101:                        ("AURPsndOpenReq: sending AURPCMD_OpenReq, node %u\n",
        !           102:                        state->rem_node));
        !           103:                AURPsend(m, AUD_AURP, state->rem_node);
        !           104:        }
        !           105: 
        !           106:        /* start the retry timer */
        !           107:        timeout(AURPsndOpenReq, state, AURP_RetryInterval*HZ);
        !           108:        state->rcv_tmo = 1;
        !           109: }
        !           110: 
        !           111: /* */
        !           112: void AURPrcvOpenReq(state, m)
        !           113:        aurp_state_t *state;
        !           114:        gbuf_t *m;
        !           115: {
        !           116:        short rc, version;
        !           117:        aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
        !           118:        unsigned short sui = hdrp->flags;
        !           119: 
        !           120:        /* make sure we're in a valid state to accept it */
        !           121:        if ((update_tmo == 0) || ((state->snd_state != AURPSTATE_Unconnected) &&
        !           122:                        (state->snd_state != AURPSTATE_Connected))) {
        !           123:                dPrintf(D_M_AURP, D_L_WARNING,
        !           124:                        ("AURPrcvOpenReq: unexpected request, update_tmo=0x%x, snd_state=%u\n", (unsigned int) update_tmo, state->snd_state));
        !           125:                gbuf_freem(m);
        !           126:                return;
        !           127:        }
        !           128: 
        !           129:        /* check for the correct version number */
        !           130:        version = *(short *)(hdrp+1);
        !           131:        if (version != AURP_Version) {
        !           132:                dPrintf(D_M_AURP, D_L_WARNING,
        !           133:                        ("AURPrcvOpenReq: invalid version number %d, expected %d\n", version, AURP_Version));
        !           134:                rc = AURPERR_InvalidVersionNumber;
        !           135:        } else
        !           136:                rc = (short)AURP_UpdateRate;
        !           137: 
        !           138:        /* construct the open response packet */
        !           139:        gbuf_wset(m,sizeof(aurp_hdr_t)+sizeof(short));
        !           140:        hdrp->command_code = AURPCMD_OpenRsp;
        !           141:        hdrp->flags = 0;
        !           142:        *(short *)(hdrp+1) = rc;
        !           143:        ((char *)(hdrp+1))[2] = 0; /* option count */
        !           144: 
        !           145:        /*
        !           146:         * reset if we're in the Connected state and this is
        !           147:         * a completely new open request
        !           148:         */
        !           149:        if ((state->snd_state == AURPSTATE_Connected) &&
        !           150:                ((state->snd_connection_id != hdrp->connection_id) ||
        !           151:                        (state->snd_sequence_number != AURP_FirstSeqNum))) {
        !           152:                extern void AURPsndTickle();
        !           153:                if (state->rcv_state == AURPSTATE_Connected) {
        !           154:                        state->rcv_state = AURPSTATE_Unconnected;
        !           155:                        untimeout(AURPsndTickle, state);
        !           156:                }
        !           157:                state->snd_state = AURPSTATE_Unconnected;
        !           158:                AURPcleanup(state);
        !           159:                AURPpurgeri(state->rem_node);
        !           160:        }
        !           161: 
        !           162:        /* update state info */
        !           163:        if (state->snd_state == AURPSTATE_Unconnected) {
        !           164:                state->snd_state = AURPSTATE_Connected;
        !           165:                state->snd_sui = sui;
        !           166:                state->snd_connection_id = hdrp->connection_id;
        !           167:                state->snd_sequence_number = AURP_FirstSeqNum;
        !           168:        }
        !           169: 
        !           170:        /* send the packet */
        !           171:        AURPsend(m, AUD_AURP, state->rem_node);
        !           172: 
        !           173:        /* open connection for the data receiver side if not yet connected */
        !           174:        if (state->rcv_state == AURPSTATE_Unconnected) {
        !           175:                state->rcv_retry = 0;
        !           176:                state->tickle_retry = 0;
        !           177:                state->rcv_sequence_number = 0;
        !           178:                AURPsndOpenReq(state);
        !           179:        }
        !           180: }
        !           181: 
        !           182: /* */
        !           183: void AURPrcvOpenRsp(state, m)
        !           184:        aurp_state_t *state;
        !           185:        gbuf_t *m;
        !           186: {
        !           187:        extern void AURPsndTickle();
        !           188:        short rc;
        !           189:        aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
        !           190: 
        !           191:        /* make sure we're in a valid state to accept it */
        !           192:        if (state->rcv_state != AURPSTATE_WaitingForOpenRsp) {
        !           193:                dPrintf(D_M_AURP, D_L_WARNING,
        !           194:                        ("AURPrcvOpenRsp: unexpected response\n"));
        !           195:                gbuf_freem(m);
        !           196:                return;
        !           197:        }
        !           198: 
        !           199:        /* check for the correct connection id */
        !           200:        if (hdrp->connection_id != state->rcv_connection_id) {
        !           201:                dPrintf(D_M_AURP, D_L_WARNING,
        !           202:                        ("AURPrcvOpenRsp: invalid connection id, r=%d, m=%d\n",
        !           203:                        hdrp->connection_id, state->rcv_connection_id));
        !           204:                gbuf_freem(m);
        !           205:                return;
        !           206:        }
        !           207: 
        !           208:        /* cancel the retry timer */
        !           209:        untimeout(AURPsndOpenReq, state);
        !           210:        state->rcv_tmo = 0;
        !           211:        state->rcv_retry = 0;
        !           212: 
        !           213:        /* update state info */
        !           214:        state->rcv_sequence_number = AURP_FirstSeqNum;
        !           215:        state->rcv_env = hdrp->flags;
        !           216: 
        !           217:        /* check for error */
        !           218:        rc = *(short *)(hdrp+1);
        !           219:        gbuf_freem(m);
        !           220:        if (rc < 0) {
        !           221:                dPrintf(D_M_AURP, D_L_WARNING,
        !           222:                        ("AURPrcvOpenRsp: error=%d\n", rc));
        !           223:                return;
        !           224:        }
        !           225: 
        !           226:        /* update state info */
        !           227:        state->rcv_update_rate = (unsigned short)rc;
        !           228:        state->rcv_state = AURPSTATE_Connected;
        !           229:        dPrintf(D_M_AURP, D_L_TRACE, ("AURPrcvOpenRsp: moved rcv_state to AURPSTATE_Connected\n"));
        !           230: 
        !           231:        /* start tickle */
        !           232:        timeout(AURPsndTickle, state, AURP_TickleRetryInterval*HZ);
        !           233: 
        !           234:        /* get routing info */
        !           235:        AURPsndRIReq(state);
        !           236: }

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