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Annotation of embedaddon/quagga/babeld/route.h, revision 1.1

1.1     ! misho       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: Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
        !            20: 
        !            21: Permission is hereby granted, free of charge, to any person obtaining a copy
        !            22: of this software and associated documentation files (the "Software"), to deal
        !            23: in the Software without restriction, including without limitation the rights
        !            24: to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
        !            25: copies of the Software, and to permit persons to whom the Software is
        !            26: furnished to do so, subject to the following conditions:
        !            27: 
        !            28: The above copyright notice and this permission notice shall be included in
        !            29: all copies or substantial portions of the Software.
        !            30: 
        !            31: THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
        !            32: IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
        !            33: FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
        !            34: AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
        !            35: LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
        !            36: OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
        !            37: THE SOFTWARE.
        !            38: */
        !            39: 
        !            40: #ifndef BABEL_ROUTE_H
        !            41: #define BABEL_ROUTE_H
        !            42: 
        !            43: #include "babel_interface.h"
        !            44: #include "source.h"
        !            45: 
        !            46: #define DIVERSITY_NONE 0
        !            47: #define DIVERSITY_INTERFACE_1 1
        !            48: #define DIVERSITY_CHANNEL_1 2
        !            49: #define DIVERSITY_CHANNEL 3
        !            50: 
        !            51: #define DIVERSITY_HOPS 8
        !            52: 
        !            53: struct babel_route {
        !            54:     struct source *src;
        !            55:     unsigned short refmetric;
        !            56:     unsigned short cost;
        !            57:     unsigned short add_metric;
        !            58:     unsigned short seqno;
        !            59:     struct neighbour *neigh;
        !            60:     unsigned char nexthop[16];
        !            61:     time_t time;
        !            62:     unsigned short hold_time;    /* in seconds */
        !            63:     short installed;
        !            64:     unsigned char channels[DIVERSITY_HOPS];
        !            65:     struct babel_route *next;
        !            66: };
        !            67: 
        !            68: extern struct babel_route **routes;
        !            69: extern int kernel_metric, allow_duplicates;
        !            70: extern int diversity_kind, diversity_factor;
        !            71: extern int keep_unfeasible;
        !            72: 
        !            73: static inline int
        !            74: route_metric(const struct babel_route *route)
        !            75: {
        !            76:     int m = (int)route->refmetric + route->cost + route->add_metric;
        !            77:     return MIN(m, INFINITY);
        !            78: }
        !            79: 
        !            80: static inline int
        !            81: route_metric_noninterfering(const struct babel_route *route)
        !            82: {
        !            83:     int m =
        !            84:         (int)route->refmetric +
        !            85:         (diversity_factor * route->cost + 128) / 256 +
        !            86:         route->add_metric;
        !            87:     m = MAX(m, route->refmetric + 1);
        !            88:     return MIN(m, INFINITY);
        !            89: }
        !            90: 
        !            91: struct babel_route *find_route(const unsigned char *prefix, unsigned char plen,
        !            92:                          struct neighbour *neigh, const unsigned char *nexthop);
        !            93: struct babel_route *find_installed_route(const unsigned char *prefix,
        !            94:                                    unsigned char plen);
        !            95: int installed_routes_estimate(void);
        !            96: void flush_route(struct babel_route *route);
        !            97: void flush_all_routes(void);
        !            98: void flush_neighbour_routes(struct neighbour *neigh);
        !            99: void flush_interface_routes(struct interface *ifp, int v4only);
        !           100: void for_all_routes(void (*f)(struct babel_route*, void*), void *closure);
        !           101: void for_all_installed_routes(void (*f)(struct babel_route*, void*), void *closure);
        !           102: void install_route(struct babel_route *route);
        !           103: void uninstall_route(struct babel_route *route);
        !           104: void switch_route(struct babel_route *old, struct babel_route *new);
        !           105: int route_feasible(struct babel_route *route);
        !           106: int route_old(struct babel_route *route);
        !           107: int route_expired(struct babel_route *route);
        !           108: int route_interferes(struct babel_route *route, struct interface *ifp);
        !           109: int update_feasible(struct source *src,
        !           110:                     unsigned short seqno, unsigned short refmetric);
        !           111: struct babel_route *find_best_route(const unsigned char *prefix, unsigned char plen,
        !           112:                               int feasible, struct neighbour *exclude);
        !           113: struct babel_route *install_best_route(const unsigned char prefix[16],
        !           114:                                  unsigned char plen);
        !           115: void update_neighbour_metric(struct neighbour *neigh, int change);
        !           116: void update_interface_metric(struct interface *ifp);
        !           117: void update_route_metric(struct babel_route *route);
        !           118: struct babel_route *update_route(const unsigned char *id,
        !           119:                            const unsigned char *prefix, unsigned char plen,
        !           120:                            unsigned short seqno, unsigned short refmetric,
        !           121:                            unsigned short interval, struct neighbour *neigh,
        !           122:                            const unsigned char *nexthop,
        !           123:                            const unsigned char *channels, int channels_len);
        !           124: void retract_neighbour_routes(struct neighbour *neigh);
        !           125: void send_unfeasible_request(struct neighbour *neigh, int force,
        !           126:                              unsigned short seqno, unsigned short metric,
        !           127:                              struct source *src);
        !           128: void send_triggered_update(struct babel_route *route,
        !           129:                            struct source *oldsrc, unsigned oldmetric);
        !           130: void route_changed(struct babel_route *route,
        !           131:                    struct source *oldsrc, unsigned short oldmetric);
        !           132: void route_lost(struct source *src, unsigned oldmetric);
        !           133: void expire_routes(void);
        !           134: 
        !           135: #endif