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    1: /*  
    2:  *  This file is free software: you may copy, redistribute and/or modify it  
    3:  *  under the terms of the GNU General Public License as published by the  
    4:  *  Free Software Foundation, either version 2 of the License, or (at your  
    5:  *  option) any later version.  
    6:  *  
    7:  *  This file is distributed in the hope that it will be useful, but  
    8:  *  WITHOUT ANY WARRANTY; without even the implied warranty of  
    9:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  
   10:  *  General Public License for more details.  
   11:  *  
   12:  *  You should have received a copy of the GNU General Public License  
   13:  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.  
   14:  *  
   15:  * This file incorporates work covered by the following copyright and  
   16:  * permission notice:  
   17:  *  
   18: Copyright (c) 2007, 2008 by Juliusz Chroboczek
   19: 
   20: Permission is hereby granted, free of charge, to any person obtaining a copy
   21: of this software and associated documentation files (the "Software"), to deal
   22: in the Software without restriction, including without limitation the rights
   23: to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   24: copies of the Software, and to permit persons to whom the Software is
   25: furnished to do so, subject to the following conditions:
   26: 
   27: The above copyright notice and this permission notice shall be included in
   28: all copies or substantial portions of the Software.
   29: 
   30: THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   31: IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   32: FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
   33: AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   34: LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   35: OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   36: THE SOFTWARE.
   37: */
   38: 
   39: #define REQUEST_TIMEOUT 65000
   40: #define RESEND_MAX 3
   41: 
   42: #define RESEND_REQUEST 1
   43: #define RESEND_UPDATE 2
   44: 
   45: struct resend {
   46:     unsigned char kind;
   47:     unsigned char max;
   48:     unsigned short delay;
   49:     struct timeval time;
   50:     unsigned char prefix[16];
   51:     unsigned char plen;
   52:     unsigned short seqno;
   53:     unsigned char id[8];
   54:     struct interface *ifp;
   55:     struct resend *next;
   56: };
   57: 
   58: extern struct timeval resend_time;
   59: 
   60: struct resend *find_request(const unsigned char *prefix, unsigned char plen,
   61:                             struct resend **previous_return);
   62: void flush_resends(struct neighbour *neigh);
   63: int record_resend(int kind, const unsigned char *prefix, unsigned char plen,
   64:                    unsigned short seqno, const unsigned char *id,
   65:                    struct interface *ifp, int delay);
   66: int unsatisfied_request(const unsigned char *prefix, unsigned char plen,
   67:                         unsigned short seqno, const unsigned char *id);
   68: int request_redundant(struct interface *ifp,
   69:                       const unsigned char *prefix, unsigned char plen,
   70:                       unsigned short seqno, const unsigned char *id);
   71: int satisfy_request(const unsigned char *prefix, unsigned char plen,
   72:                     unsigned short seqno, const unsigned char *id,
   73:                     struct interface *ifp);
   74: 
   75: void expire_resend(void);
   76: void recompute_resend_time(void);
   77: void do_resend(void);