babeld/babel_filter.c

   1 /*
   2 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
   3
   4 Permission is hereby granted, free of charge, to any person obtaining a copy
   5 of this software and associated documentation files (the "Software"), to deal
   6 in the Software without restriction, including without limitation the rights
   7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8 copies of the Software, and to permit persons to whom the Software is
   9 furnished to do so, subject to the following conditions:
  10
  11 The above copyright notice and this permission notice shall be included in
  12 all copies or substantial portions of the Software.
  13
  14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  20 THE SOFTWARE.
  21 */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include "babel_filter.h"
  28 #include "vty.h"
  29 #include "filter.h"
  30 #include "log.h"
  31 #include "plist.h"
  32 #include "distribute.h"
  33 #include "util.h"
  34
  35 int
  36 babel_filter(int output, const unsigned char *prefix, unsigned short plen,
  37              unsigned int ifindex)
  38 {
  39     struct interface *ifp = if_lookup_by_index(ifindex, VRF_DEFAULT);
  40     babel_interface_nfo *babel_ifp = ifp ? babel_get_if_nfo(ifp) : NULL;
  41     struct prefix p;
  42     struct distribute *dist;
  43     struct access_list *alist;
  44     struct prefix_list *plist;
  45     int distribute;
  46
  47     p.family = v4mapped(prefix) ? AF_INET : AF_INET6;
  48     p.prefixlen = v4mapped(prefix) ? plen - 96 : plen;
  49     if (p.family == AF_INET) {
  50         uchar_to_inaddr(&p.u.prefix4, prefix);
  51         distribute = output ? DISTRIBUTE_V4_OUT : DISTRIBUTE_V4_IN;
  52     } else {
  53         uchar_to_in6addr(&p.u.prefix6, prefix);
  54         distribute = output ? DISTRIBUTE_V6_OUT : DISTRIBUTE_V6_IN;
  55     }
  56
  57     if (babel_ifp != NULL && babel_ifp->list[distribute]) {
  58         if (access_list_apply (babel_ifp->list[distribute], &p)
  59             == FILTER_DENY) {
  60             debugf(BABEL_DEBUG_FILTER,
  61                    "%s/%d filtered by distribute %s",
  62                    p.family == AF_INET ?
  63                    inet_ntoa(p.u.prefix4) :
  64                    inet6_ntoa (p.u.prefix6),
  65                    p.prefixlen,
  66                    output ? "out" : "in");
  67             return INFINITY;
  68         }
  69     }
  70     if (babel_ifp != NULL && babel_ifp->prefix[distribute]) {
  71         if (prefix_list_apply (babel_ifp->prefix[distribute], &p)
  72             == PREFIX_DENY) {
  73             debugf(BABEL_DEBUG_FILTER, "%s/%d filtered by distribute %s",
  74                    p.family == AF_INET ?
  75                    inet_ntoa(p.u.prefix4) :
  76                    inet6_ntoa (p.u.prefix6),
  77                    p.prefixlen,
  78                    output ? "out" : "in");
  79             return INFINITY;
  80         }
  81     }
  82
  83     /* All interface filter check. */
  84     dist = distribute_lookup (NULL);
  85     if (dist) {
  86         if (dist->list[distribute]) {
  87             alist = access_list_lookup (p.family, dist->list[distribute]);
  88
  89             if (alist) {
  90                 if (access_list_apply (alist, &p) == FILTER_DENY) {
  91                     debugf(BABEL_DEBUG_FILTER,"%s/%d filtered by distribute %s",
  92                            p.family == AF_INET ?
  93                            inet_ntoa(p.u.prefix4) :
  94                            inet6_ntoa (p.u.prefix6),
  95                            p.prefixlen,
  96                            output ? "out" : "in");
  97                     return INFINITY;
  98                 }
  99             }
 100         }
 101         if (dist->prefix[distribute]) {
 102             plist = prefix_list_lookup (p.family, dist->prefix[distribute]);
 103             if (plist) {
 104                 if (prefix_list_apply (plist, &p) == PREFIX_DENY) {
 105                     debugf(BABEL_DEBUG_FILTER,"%s/%d filtered by distribute %s",
 106                            p.family == AF_INET ?
 107                            inet_ntoa(p.u.prefix4) :
 108                            inet6_ntoa (p.u.prefix6),
 109                            p.prefixlen,
 110                            output ? "out" : "in");
 111                     return INFINITY;
 112                 }
 113             }
 114         }
 115     }
 116     return 0;
 117 }