From 5734509c0545ebd95a5b8e3f22a911c1a39ffa1b Mon Sep 17 00:00:00 2001 From: Paul Jakma Date: Sun, 25 Dec 2011 17:52:09 +0100 Subject: 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 --- babeld/xroute.c | 226 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 226 insertions(+) create mode 100644 babeld/xroute.c (limited to 'babeld/xroute.c') diff --git a/babeld/xroute.c b/babeld/xroute.c new file mode 100644 index 00000000..42f83d07 --- /dev/null +++ b/babeld/xroute.c @@ -0,0 +1,226 @@ +/* + * 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 . + * + * 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 +#include +#include +#include +#include +#include +#include + +#include +#include "if.h" +#include "log.h" + +#include "babeld.h" +#include "kernel.h" +#include "neighbour.h" +#include "message.h" +#include "route.h" +#include "xroute.h" +#include "util.h" +#include "babel_interface.h" + +struct xroute *xroutes; +int numxroutes = 0; +int maxxroutes = 0; + +/* Add redistributed route to Babel table. */ +int +babel_ipv4_route_add (struct zapi_ipv4 *api, struct prefix_ipv4 *prefix, + unsigned int ifindex, struct in_addr *nexthop) +{ + unsigned char uchar_prefix[16]; + + inaddr_to_uchar(uchar_prefix, &prefix->prefix); + debugf(BABEL_DEBUG_ROUTE, "Adding new ipv4 route comming from Zebra."); + xroute_add_new_route(uchar_prefix, prefix->prefixlen, api->metric, ifindex, + 0, 1); + return 0; +} + +/* Remove redistributed route from Babel table. */ +int +babel_ipv4_route_delete (struct zapi_ipv4 *api, struct prefix_ipv4 *prefix, + unsigned int ifindex) +{ + unsigned char uchar_prefix[16]; + struct xroute *xroute = NULL; + + inaddr_to_uchar(uchar_prefix, &prefix->prefix); + xroute = find_xroute(uchar_prefix, prefix->prefixlen); + if (xroute != NULL) { + debugf(BABEL_DEBUG_ROUTE, "Removing ipv4 route (from zebra)."); + flush_xroute(xroute); + } + return 0; +} + +/* Add redistributed route to Babel table. */ +int +babel_ipv6_route_add (struct zapi_ipv6 *api, struct prefix_ipv6 *prefix, + unsigned int ifindex, struct in6_addr *nexthop) +{ + unsigned char uchar_prefix[16]; + + in6addr_to_uchar(uchar_prefix, &prefix->prefix); + debugf(BABEL_DEBUG_ROUTE, "Adding new route comming from Zebra."); + xroute_add_new_route(uchar_prefix, prefix->prefixlen, api->metric, ifindex, + 0, 1); + return 0; +} + +/* Remove redistributed route from Babel table. */ +int +babel_ipv6_route_delete (struct zapi_ipv6 *api, struct prefix_ipv6 *prefix, + unsigned int ifindex) +{ + unsigned char uchar_prefix[16]; + struct xroute *xroute = NULL; + + in6addr_to_uchar(uchar_prefix, &prefix->prefix); + xroute = find_xroute(uchar_prefix, prefix->prefixlen); + if (xroute != NULL) { + debugf(BABEL_DEBUG_ROUTE, "Removing route (from zebra)."); + flush_xroute(xroute); + } + return 0; +} + +struct xroute * +find_xroute(const unsigned char *prefix, unsigned char plen) +{ + int i; + for(i = 0; i < numxroutes; i++) { + if(xroutes[i].plen == plen && + memcmp(xroutes[i].prefix, prefix, 16) == 0) + return &xroutes[i]; + } + return NULL; +} + +void +flush_xroute(struct xroute *xroute) +{ + int i; + + i = xroute - xroutes; + assert(i >= 0 && i < numxroutes); + + if(i != numxroutes - 1) + memcpy(xroutes + i, xroutes + numxroutes - 1, sizeof(struct xroute)); + numxroutes--; + VALGRIND_MAKE_MEM_UNDEFINED(xroutes + numxroutes, sizeof(struct xroute)); + + if(numxroutes == 0) { + free(xroutes); + xroutes = NULL; + maxxroutes = 0; + } else if(maxxroutes > 8 && numxroutes < maxxroutes / 4) { + struct xroute *new_xroutes; + int n = maxxroutes / 2; + new_xroutes = realloc(xroutes, n * sizeof(struct xroute)); + if(new_xroutes == NULL) + return; + xroutes = new_xroutes; + maxxroutes = n; + } +} + +static int +add_xroute(unsigned char prefix[16], unsigned char plen, + unsigned short metric, unsigned int ifindex, int proto) +{ + struct xroute *xroute = find_xroute(prefix, plen); + if(xroute) { + if(xroute->metric <= metric) + return 0; + xroute->metric = metric; + return 1; + } + + if(numxroutes >= maxxroutes) { + struct xroute *new_xroutes; + int n = maxxroutes < 1 ? 8 : 2 * maxxroutes; + new_xroutes = xroutes == NULL ? + malloc(n * sizeof(struct xroute)) : + realloc(xroutes, n * sizeof(struct xroute)); + if(new_xroutes == NULL) + return -1; + maxxroutes = n; + xroutes = new_xroutes; + } + + memcpy(xroutes[numxroutes].prefix, prefix, 16); + xroutes[numxroutes].plen = plen; + xroutes[numxroutes].metric = metric; + xroutes[numxroutes].ifindex = ifindex; + xroutes[numxroutes].proto = proto; + numxroutes++; + return 1; +} + +/* add an xroute, verifying some conditions; return 0 if there is no changes */ +int +xroute_add_new_route(unsigned char prefix[16], unsigned char plen, + unsigned short metric, unsigned int ifindex, + int proto, int send_updates) +{ + int rc; + if(martian_prefix(prefix, plen)) + return 0; + metric = redistribute_filter(prefix, plen, ifindex, proto); + if(metric < INFINITY) { + rc = add_xroute(prefix, plen, metric, ifindex, proto); + if(rc > 0) { + struct route *route; + route = find_installed_route(prefix, plen); + if(route) { + if(allow_duplicates < 0 || + metric < allow_duplicates) + uninstall_route(route); + } + if(send_updates) + send_update(NULL, 0, prefix, plen); + return 1; + } + } + return 0; +} -- cgit v1.2.1