diff options
Diffstat (limited to 'babeld/xroute.c')
| -rw-r--r-- | babeld/xroute.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/babeld/xroute.c b/babeld/xroute.c new file mode 100644 index 0000000..30204cd --- /dev/null +++ b/babeld/xroute.c @@ -0,0 +1,214 @@ +// SPDX-License-Identifier: MIT +/* +Copyright (c) 2007, 2008 by Juliusz Chroboczek +Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek +*/ + +#include <zebra.h> +#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" + +static int xroute_add_new_route(unsigned char prefix[16], unsigned char plen, + unsigned short metric, unsigned int ifindex, + int proto, int send_updates); + +static struct xroute *xroutes; +static int numxroutes = 0, maxxroutes = 0; + +/* Add redistributed route to Babel table. */ +int +babel_route_add (struct zapi_route *api) +{ + unsigned char uchar_prefix[16]; + + switch (api->prefix.family) { + case AF_INET: + inaddr_to_uchar(uchar_prefix, &api->prefix.u.prefix4); + debugf(BABEL_DEBUG_ROUTE, "Adding new ipv4 route coming from Zebra."); + xroute_add_new_route(uchar_prefix, api->prefix.prefixlen + 96, + api->metric, api->nexthops[0].ifindex, 0, 1); + break; + case AF_INET6: + in6addr_to_uchar(uchar_prefix, &api->prefix.u.prefix6); + debugf(BABEL_DEBUG_ROUTE, "Adding new ipv6 route coming from Zebra."); + xroute_add_new_route(uchar_prefix, api->prefix.prefixlen, + api->metric, api->nexthops[0].ifindex, 0, 1); + break; + } + + return 0; +} + +/* Remove redistributed route from Babel table. */ +int +babel_route_delete (struct zapi_route *api) +{ + unsigned char uchar_prefix[16]; + struct xroute *xroute = NULL; + + switch (api->prefix.family) { + case AF_INET: + inaddr_to_uchar(uchar_prefix, &api->prefix.u.prefix4); + xroute = find_xroute(uchar_prefix, api->prefix.prefixlen + 96); + if (xroute != NULL) { + debugf(BABEL_DEBUG_ROUTE, "Removing ipv4 route (from zebra)."); + flush_xroute(xroute); + } + break; + case AF_INET6: + in6addr_to_uchar(uchar_prefix, &api->prefix.u.prefix6); + xroute = find_xroute(uchar_prefix, api->prefix.prefixlen); + if (xroute != NULL) { + debugf(BABEL_DEBUG_ROUTE, "Removing ipv6 route (from zebra)."); + flush_xroute(xroute); + } + break; + } + + 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; +} + +/* Returns an overestimate of the number of xroutes. */ +int +xroutes_estimate(void) +{ + return numxroutes; +} + +struct xroute_stream { + int index; +}; + +struct +xroute_stream * +xroute_stream(void) +{ + struct xroute_stream *stream = malloc(sizeof(struct xroute_stream)); + if(stream == NULL) + return NULL; + + stream->index = 0; + return stream; +} + +struct xroute * +xroute_stream_next(struct xroute_stream *stream) +{ + if(stream->index < numxroutes) + return &xroutes[stream->index++]; + else + return NULL; +} + +void +xroute_stream_done(struct xroute_stream *stream) +{ + free(stream); +} + +/* add an xroute, verifying some conditions; return 0 if there is no changes */ +static 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 babel_route *route; + route = find_installed_route(prefix, plen); + if(route) + uninstall_route(route); + if(send_updates) + send_update(NULL, 0, prefix, plen); + return 1; + } + } + return 0; +} |