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Annotation of XNU/bsd/netat/aurp_tickle.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: tickle.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 AURPsndTickle(state)
        !            54:        aurp_state_t *state;
        !            55: {
        !            56:        int msize;
        !            57:        gbuf_t *m;
        !            58:        aurp_hdr_t *hdrp;
        !            59: 
        !            60:        if (state->rcv_state == AURPSTATE_Unconnected)
        !            61:                return;
        !            62: 
        !            63:        /* stop trying if the retry count exceeds the maximum retry value */
        !            64:        if (++state->tickle_retry > AURP_MaxTickleRetry) {
        !            65:                dPrintf(D_M_AURP, D_L_WARNING,
        !            66:                        ("AURPsndTickle: no response, %d\n", state->rem_node));
        !            67:                /*
        !            68:                 * the tunnel peer seems to have disappeared, update state info
        !            69:                 */
        !            70:                state->snd_state = AURPSTATE_Unconnected;
        !            71:                state->rcv_state = AURPSTATE_Unconnected;
        !            72:                state->tickle_retry = 0;
        !            73:                AURPcleanup(state);
        !            74: 
        !            75:                /* purge all routes associated with the tunnel peer */
        !            76:                AURPpurgeri(state->rem_node);
        !            77:                return;
        !            78:        }
        !            79: 
        !            80:   if (state->tickle_retry > 1) {
        !            81:        msize = sizeof(aurp_hdr_t);
        !            82:        if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
        !            83:                gbuf_wset(m,msize);
        !            84: 
        !            85:                /* construct the tickle packet */
        !            86:                hdrp = (aurp_hdr_t *)gbuf_rptr(m);
        !            87:                hdrp->connection_id = state->rcv_connection_id;
        !            88:                hdrp->sequence_number = 0;
        !            89:                hdrp->command_code = AURPCMD_Tickle;
        !            90:                hdrp->flags = 0;
        !            91: 
        !            92:                /* send the packet */
        !            93:                AURPsend(m, AUD_AURP, state->rem_node);
        !            94:        }
        !            95:   }
        !            96: 
        !            97:        /* start the retry timer */
        !            98:        timeout(AURPsndTickle, state, AURP_TickleRetryInterval*HZ);
        !            99: }
        !           100: 
        !           101: /* */
        !           102: void AURPrcvTickle(state, m)
        !           103:        aurp_state_t *state;
        !           104:        gbuf_t *m;
        !           105: {
        !           106:        aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
        !           107: 
        !           108:        /* make sure we're in a valid state to accept it */
        !           109:        if (state->snd_state == AURPSTATE_Unconnected) {
        !           110:                dPrintf(D_M_AURP, D_L_WARNING,
        !           111:                        ("AURPrcvTickle: unexpected request\n"));
        !           112:                gbuf_freem(m);
        !           113:                return;
        !           114:        }
        !           115: 
        !           116:        /* construct the tickle ack packet */
        !           117:        gbuf_wset(m,sizeof(aurp_hdr_t));
        !           118:        hdrp->command_code = AURPCMD_TickleAck;
        !           119:        hdrp->flags = 0;
        !           120: 
        !           121:        /* send the packet */
        !           122:        AURPsend(m, AUD_AURP, state->rem_node);
        !           123: }
        !           124: 
        !           125: /* */
        !           126: void AURPrcvTickleAck(state, m)
        !           127:        aurp_state_t *state;
        !           128:        gbuf_t *m;
        !           129: {
        !           130:        aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
        !           131: 
        !           132:        /* make sure we're in a valid state to accept it */
        !           133:        if (state->rcv_state == AURPSTATE_Unconnected) {
        !           134:                dPrintf(D_M_AURP, D_L_WARNING,
        !           135:                        ("AURPrcvTickleAck: unexpected response\n"));
        !           136:                gbuf_freem(m);
        !           137:                return;
        !           138:        }
        !           139: 
        !           140:        /* check for the correct connection id */
        !           141:        if (hdrp->connection_id != state->rcv_connection_id) {
        !           142:                dPrintf(D_M_AURP, D_L_WARNING,
        !           143:                        ("AURPrcvTickleAck: invalid connection id, r=%d, m=%d\n",
        !           144:                        hdrp->connection_id, state->rcv_connection_id));
        !           145:                gbuf_freem(m);
        !           146:                return;
        !           147:        }
        !           148:        gbuf_freem(m);
        !           149: 
        !           150:        /* update state info */
        !           151:        state->tickle_retry = 0;
        !           152: }

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