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// 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;
}
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