babeld: Initial import, for Babel routing protocol.

* Initial import of the Babel routing protocol, ported to Quagga.
* LICENCE: Update the original LICENCE file to include all known potentially
  applicable copyright claims.  Ask that any future contributors to babeld/
  grant MIT/X11 licence to their work.
* *.{c,h}: Add GPL headers, in according with the SFLC guidance on
  dealing with potentially mixed GPL/other licensed work, at:

  https://www.softwarefreedom.org/resources/2007/gpl-non-gpl-collaboration.html

1 files changed, 104 insertions, 0 deletions

diff --git a/babeld/route.h b/babeld/route.h
new file mode 100644
index 000000000..e36f6c34c
--- /dev/null
+++ b/babeld/route.h
@@ -0,0 +1,104 @@
+/*  
+ *  This file is free software: you may copy, redistribute and/or modify it  
+ *  under the terms of the GNU General Public License as published by the  
+ *  Free Software Foundation, either version 2 of the License, or (at your  
+ *  option) any later version.  
+ *  
+ *  This file is distributed in the hope that it will be useful, but  
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of  
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  
+ *  General Public License for more details.  
+ *  
+ *  You should have received a copy of the GNU General Public License  
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.  
+ *  
+ * This file incorporates work covered by the following copyright and  
+ * permission notice:  
+ *  
+Copyright (c) 2007, 2008 by Juliusz Chroboczek
+Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+#include "babel_interface.h"
+#include "source.h"
+
+struct route {
+    struct source *src;
+    unsigned short metric;
+    unsigned short refmetric;
+    unsigned short seqno;
+    struct neighbour *neigh;
+    unsigned char nexthop[16];
+    time_t time;
+    unsigned short hold_time;    /* in seconds */
+    short installed;
+};
+
+static inline int
+route_metric(const struct route *route)
+{
+    return route->metric;
+}
+
+extern struct route *routes;
+extern int numroutes, maxroutes;
+extern int kernel_metric, allow_duplicates;
+
+struct route *find_route(const unsigned char *prefix, unsigned char plen,
+                         struct neighbour *neigh, const unsigned char *nexthop);
+struct route *find_installed_route(const unsigned char *prefix,
+                                   unsigned char plen);
+void flush_route(struct route *route);
+void flush_neighbour_routes(struct neighbour *neigh);
+void flush_interface_routes(struct interface *ifp, int v4only);
+void install_route(struct route *route);
+void uninstall_route(struct route *route);
+void switch_route(struct route *old, struct route *new);
+int route_feasible(struct route *route);
+int route_old(struct route *route);
+int route_expired(struct route *route);
+int update_feasible(struct source *src,
+                    unsigned short seqno, unsigned short refmetric);
+struct route *find_best_route(const unsigned char *prefix, unsigned char plen,
+                              int feasible, struct neighbour *exclude);
+struct route *install_best_route(const unsigned char prefix[16],
+                                 unsigned char plen);
+void update_neighbour_metric(struct neighbour *neigh, int change);
+void update_interface_metric(struct interface *ifp);
+void update_route_metric(struct route *route);
+struct route *update_route(const unsigned char *a,
+                           const unsigned char *p, unsigned char plen,
+                           unsigned short seqno, unsigned short refmetric,
+                           unsigned short interval, struct neighbour *neigh,
+                           const unsigned char *nexthop);
+void retract_neighbour_routes(struct neighbour *neigh);
+void send_unfeasible_request(struct neighbour *neigh, int force,
+                             unsigned short seqno, unsigned short metric,
+                             struct source *src);
+void send_triggered_update(struct route *route,
+                           struct source *oldsrc, unsigned oldmetric);
+void route_changed(struct route *route,
+                   struct source *oldsrc, unsigned short oldmetric);
+void route_lost(struct source *src, unsigned oldmetric);
+void expire_routes(void);
+
+void babel_uninstall_all_routes(void);
+struct route *babel_route_get_by_source(struct source *src);