Annotation of embedaddon/quagga/babeld/xroute.c, revision 1.1.1.1

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: #include <zebra.h>
                     41: #include "if.h"
                     42: #include "log.h"
                     43: 
                     44: #include "babeld.h"
                     45: #include "kernel.h"
                     46: #include "neighbour.h"
                     47: #include "message.h"
                     48: #include "route.h"
                     49: #include "xroute.h"
                     50: #include "util.h"
                     51: #include "babel_interface.h"
                     52: 
                     53: static int xroute_add_new_route(unsigned char prefix[16], unsigned char plen,
                     54:                                 unsigned short metric, unsigned int ifindex,
                     55:                                 int proto, int send_updates);
                     56: 
                     57: static struct xroute *xroutes;
                     58: static int numxroutes = 0, maxxroutes = 0;
                     59: 
                     60: /* Add redistributed route to Babel table. */
                     61: int
                     62: babel_ipv4_route_add (struct zapi_ipv4 *api, struct prefix_ipv4 *prefix,
                     63:                       unsigned int ifindex, struct in_addr *nexthop)
                     64: {
                     65:     unsigned char uchar_prefix[16];
                     66: 
                     67:     inaddr_to_uchar(uchar_prefix, &prefix->prefix);
                     68:     debugf(BABEL_DEBUG_ROUTE, "Adding new ipv4 route comming from Zebra.");
                     69:     xroute_add_new_route(uchar_prefix, prefix->prefixlen + 96,
                     70:                          api->metric, ifindex, 0, 1);
                     71:     return 0;
                     72: }
                     73: 
                     74: /* Remove redistributed route from Babel table. */
                     75: int
                     76: babel_ipv4_route_delete (struct zapi_ipv4 *api, struct prefix_ipv4 *prefix,
                     77:                          unsigned int ifindex)
                     78: {
                     79:     unsigned char uchar_prefix[16];
                     80:     struct xroute *xroute = NULL;
                     81: 
                     82:     inaddr_to_uchar(uchar_prefix, &prefix->prefix);
                     83:     xroute = find_xroute(uchar_prefix, prefix->prefixlen + 96);
                     84:     if (xroute != NULL) {
                     85:         debugf(BABEL_DEBUG_ROUTE, "Removing ipv4 route (from zebra).");
                     86:         flush_xroute(xroute);
                     87:     }
                     88:     return 0;
                     89: }
                     90: 
                     91: /* Add redistributed route to Babel table. */
                     92: int
                     93: babel_ipv6_route_add (struct zapi_ipv6 *api, struct prefix_ipv6 *prefix,
                     94:                       unsigned int ifindex, struct in6_addr *nexthop)
                     95: {
                     96:     unsigned char uchar_prefix[16];
                     97: 
                     98:     in6addr_to_uchar(uchar_prefix, &prefix->prefix);
                     99:     debugf(BABEL_DEBUG_ROUTE, "Adding new route comming from Zebra.");
                    100:     xroute_add_new_route(uchar_prefix, prefix->prefixlen, api->metric, ifindex,
                    101:                          0, 1);
                    102:     return 0;
                    103: }
                    104: 
                    105: /* Remove redistributed route from Babel table. */
                    106: int
                    107: babel_ipv6_route_delete (struct zapi_ipv6 *api, struct prefix_ipv6 *prefix,
                    108:                          unsigned int ifindex)
                    109: {
                    110:     unsigned char uchar_prefix[16];
                    111:     struct xroute *xroute = NULL;
                    112: 
                    113:     in6addr_to_uchar(uchar_prefix, &prefix->prefix);
                    114:     xroute = find_xroute(uchar_prefix, prefix->prefixlen);
                    115:     if (xroute != NULL) {
                    116:         debugf(BABEL_DEBUG_ROUTE, "Removing route (from zebra).");
                    117:         flush_xroute(xroute);
                    118:     }
                    119:     return 0;
                    120: }
                    121: 
                    122: struct xroute *
                    123: find_xroute(const unsigned char *prefix, unsigned char plen)
                    124: {
                    125:     int i;
                    126:     for(i = 0; i < numxroutes; i++) {
                    127:         if(xroutes[i].plen == plen &&
                    128:            memcmp(xroutes[i].prefix, prefix, 16) == 0)
                    129:             return &xroutes[i];
                    130:     }
                    131:     return NULL;
                    132: }
                    133: 
                    134: void
                    135: flush_xroute(struct xroute *xroute)
                    136: {
                    137:     int i;
                    138: 
                    139:     i = xroute - xroutes;
                    140:     assert(i >= 0 && i < numxroutes);
                    141: 
                    142:     if(i != numxroutes - 1)
                    143:         memcpy(xroutes + i, xroutes + numxroutes - 1, sizeof(struct xroute));
                    144:     numxroutes--;
                    145:     VALGRIND_MAKE_MEM_UNDEFINED(xroutes + numxroutes, sizeof(struct xroute));
                    146: 
                    147:     if(numxroutes == 0) {
                    148:         free(xroutes);
                    149:         xroutes = NULL;
                    150:         maxxroutes = 0;
                    151:     } else if(maxxroutes > 8 && numxroutes < maxxroutes / 4) {
                    152:         struct xroute *new_xroutes;
                    153:         int n = maxxroutes / 2;
                    154:         new_xroutes = realloc(xroutes, n * sizeof(struct xroute));
                    155:         if(new_xroutes == NULL)
                    156:             return;
                    157:         xroutes = new_xroutes;
                    158:         maxxroutes = n;
                    159:     }
                    160: }
                    161: 
                    162: static int
                    163: add_xroute(unsigned char prefix[16], unsigned char plen,
                    164:            unsigned short metric, unsigned int ifindex, int proto)
                    165: {
                    166:     struct xroute *xroute = find_xroute(prefix, plen);
                    167:     if(xroute) {
                    168:         if(xroute->metric <= metric)
                    169:             return 0;
                    170:         xroute->metric = metric;
                    171:         return 1;
                    172:     }
                    173: 
                    174:     if(numxroutes >= maxxroutes) {
                    175:         struct xroute *new_xroutes;
                    176:         int n = maxxroutes < 1 ? 8 : 2 * maxxroutes;
                    177:         new_xroutes = xroutes == NULL ?
                    178:             malloc(n * sizeof(struct xroute)) :
                    179:             realloc(xroutes, n * sizeof(struct xroute));
                    180:         if(new_xroutes == NULL)
                    181:             return -1;
                    182:         maxxroutes = n;
                    183:         xroutes = new_xroutes;
                    184:     }
                    185: 
                    186:     memcpy(xroutes[numxroutes].prefix, prefix, 16);
                    187:     xroutes[numxroutes].plen = plen;
                    188:     xroutes[numxroutes].metric = metric;
                    189:     xroutes[numxroutes].ifindex = ifindex;
                    190:     xroutes[numxroutes].proto = proto;
                    191:     numxroutes++;
                    192:     return 1;
                    193: }
                    194: 
                    195: /* Returns an overestimate of the number of xroutes. */
                    196: int
                    197: xroutes_estimate()
                    198: {
                    199:     return numxroutes;
                    200: }
                    201: 
                    202: void
                    203: for_all_xroutes(void (*f)(struct xroute*, void*), void *closure)
                    204: {
                    205:     int i;
                    206: 
                    207:     for(i = 0; i < numxroutes; i++)
                    208:         (*f)(&xroutes[i], closure);
                    209: }
                    210: 
                    211: /* add an xroute, verifying some conditions; return 0 if there is no changes */
                    212: static int
                    213: xroute_add_new_route(unsigned char prefix[16], unsigned char plen,
                    214:                      unsigned short metric, unsigned int ifindex,
                    215:                      int proto, int send_updates)
                    216: {
                    217:     int rc;
                    218:     if(martian_prefix(prefix, plen))
                    219:         return 0;
                    220:     metric = redistribute_filter(prefix, plen, ifindex, proto);
                    221:     if(metric < INFINITY) {
                    222:         rc = add_xroute(prefix, plen, metric, ifindex, proto);
                    223:         if(rc > 0) {
                    224:             struct babel_route *route;
                    225:             route = find_installed_route(prefix, plen);
                    226:             if(route) {
                    227:                 if(allow_duplicates < 0 ||
                    228:                    metric < allow_duplicates)
                    229:                     uninstall_route(route);
                    230:             }
                    231:             if(send_updates)
                    232:                 send_update(NULL, 0, prefix, plen);
                    233:             return 1;
                    234:         }
                    235:     }
                    236:     return 0;
                    237: }

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