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/* Copyright 2008 Bernhard R. Fischer, Daniel Haslinger.
*
* This file is part of OnionCat.
*
* OnionCat is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3 of the License.
*
* OnionCat 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 OnionCat. If not, see <http://www.gnu.org/licenses/>.
*/
/*! @file
* This file contains functions for managing IPv6 routing and
* forwarding.
*
* @author Bernhard R. Fischer <rahra _at_ cypherpunk at>
* @version 2008/09/03-01
*/
#include "ocat.h"
/*! IPv6 Routing table. Each entry contains 3 values:
* destination network, prefix length, gateway
*/
static IPv6Route_t *v6route_ = NULL;
static int v6route_cnt_ = 0;
static pthread_mutex_t v6route_mutex_ = PTHREAD_MUTEX_INITIALIZER;
/*! Reduce IPv6 address to prefix, i.e. cut off host id.
* @param net IPv6 address
* @param prefixlen Prefix length
*/
void ipv6_reduce(struct in6_addr *net, int prefixlen)
{
int i;
char m;
for (i = 0; i < ((128 - prefixlen) >> 3); i++)
net->s6_addr[15 - i] = 0;
m = 0xff << (8 - (prefixlen % 8));
net->s6_addr[prefixlen >> 3] &= m;
}
/*! Lookup IPv6 route.
*/
struct in6_addr *ipv6_lookup_route(const struct in6_addr *dest)
{
struct in6_addr addr;
int i, n;
pthread_mutex_lock(&v6route_mutex_);
n = v6route_cnt_;
for (i = 0; i < n; i++)
{
addr = *dest;
ipv6_reduce(&addr, v6route_[i].prefixlen);
if (IN6_ARE_ADDR_EQUAL(&v6route_[i].dest, &addr))
{
log_debug("IPv6 route found");
break;
}
}
pthread_mutex_unlock(&v6route_mutex_);
return i < n ? &v6route_[i].gw : NULL;
}
/*! Add an IPv6 route to IPv6 routing table.
* @return -1 if table is full else return index of entry.
*/
int ipv6_add_route(const IPv6Route_t *route)
{
int r = -1;
IPv6Route_t *rt;
pthread_mutex_lock(&v6route_mutex_);
if ((rt = realloc(v6route_, sizeof(IPv6Route_t) * (v6route_cnt_ + 1))))
{
v6route_ = rt;
r = v6route_cnt_;
memcpy(&v6route_[v6route_cnt_++], route, sizeof(IPv6Route_t));
}
pthread_mutex_unlock(&v6route_mutex_);
return r;
}
void ipv6_print(IPv6Route_t *route, void *f)
{
char addr[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, &route->dest, addr, INET6_ADDRSTRLEN);
fprintf(f, "IN6 %s %3d ", addr, route->prefixlen);
inet_ntop(AF_INET6, &route->gw, addr, INET6_ADDRSTRLEN);
fprintf(f, "%s %p\n", addr, route);
}
void ipv6_print_routes(FILE *f)
{
int i;
pthread_mutex_lock(&v6route_mutex_);
for (i = 0; i < v6route_cnt_; i++)
ipv6_print(&v6route_[i], f);
pthread_mutex_unlock(&v6route_mutex_);
}
/*! Parse IPv6 route and add it to routing table.
* @return index of routing table entry (>= 0) or an integer < 0 on failure.
*/
int ipv6_parse_route(const char *rs)
{
char buf[strlen(rs) + 1], *s, *b;
IPv6Route_t route6;
if (!rs)
return E_RT_NULLPTR;
log_debug("IPv6 route parser: \"%s\"", rs);
strlcpy(buf, rs, strlen(rs) + 1);
if (!(s = strtok_r(buf, " \t", &b)))
return E_RT_SYNTAX;
if (inet_pton(AF_INET6, s, &route6.dest) != 1)
return E_RT_SYNTAX;
if (!(s = strtok_r(NULL, " \t", &b)))
return E_RT_SYNTAX;
errno = 0;
route6.prefixlen = strtol(s, NULL, 10);
if (errno)
return E_RT_SYNTAX;
if ((route6.prefixlen < 0) || (route6.prefixlen > 128))
return E_RT_ILLNM;
if (!(s = strtok_r(NULL, " \t", &b)))
return E_RT_SYNTAX;
if (inet_pton(AF_INET6, s, &route6.gw) != 1)
return E_RT_SYNTAX;
if (!has_tor_prefix(&route6.gw))
return E_RT_NOTORGW;
if (IN6_ARE_ADDR_EQUAL(&route6.gw, &CNF(ocat_addr)))
return E_RT_GWSELF;
ipv6_reduce(&route6.dest, route6.prefixlen);
if (ipv6_lookup_route(&route6.dest))
return E_RT_DUP;
return ipv6_add_route(&route6);
}
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