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lookup exclusion for several arbitrary routing tables

This commit is contained in:
Thomas Egerer 2010-03-12 09:37:51 +01:00 committed by Martin Willi
parent 7b1fc2f7cf
commit d266e8953e
1 changed files with 70 additions and 0 deletions
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70
src/charon/plugins/kernel_netlink/kernel_netlink_net.c
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@ -14,6 +14,29 @@
* for more details.
*/
/*
* Copyright (C) 2010 secunet Security Networks AG
* Copyright (C) 2010 Thomas Egerer
*
* 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 <sys/socket.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
@ -158,6 +181,11 @@ struct private_kernel_netlink_net_t {
* whether to actually install virtual IPs
*/
bool install_virtual_ip;
/**
* list with routing tables to be excluded from route lookup
*/
linked_list_t *rt_exclude;
};
/**
@ -764,6 +792,7 @@ static host_t *get_route(private_kernel_netlink_net_t *this, host_t *dest,
chunk_t chunk;
size_t len;
int best = -1;
enumerator_t *enumerator;
host_t *src = NULL, *gtw = NULL;
DBG2(DBG_KNL, "getting address to reach %H", dest);
@ -813,6 +842,8 @@ static host_t *get_route(private_kernel_netlink_net_t *this, host_t *dest,
chunk_t rta_gtw, rta_src, rta_dst;
u_int32_t rta_oif = 0;
host_t *new_src, *new_gtw;
bool cont = FALSE;
uintptr_t table;
rta_gtw = rta_src = rta_dst = chunk_empty;
msg = (struct rtmsg*)(NLMSG_DATA(current));
@ -844,6 +875,20 @@ static host_t *get_route(private_kernel_netlink_net_t *this, host_t *dest,
{ /* not better than a previous one */
continue;
}
enumerator = this->rt_exclude->create_enumerator(this->rt_exclude);
while (enumerator->enumerate(enumerator, &table))
{
if (table == msg->rtm_table)
{
cont = TRUE;
break;
}
}
enumerator->destroy(enumerator);
if (cont)
{
continue;
}
if (this->routing_table != 0 &&
msg->rtm_table == this->routing_table)
{ /* route is from our own ipsec routing table */
@ -1346,6 +1391,7 @@ static void destroy(private_kernel_netlink_net_t *this)
}
DESTROY_IF(this->socket);
this->ifaces->destroy_function(this->ifaces, (void*)iface_entry_destroy);
this->rt_exclude->destroy(this->rt_exclude);
this->condvar->destroy(this->condvar);
this->mutex->destroy(this->mutex);
free(this);
@ -1358,6 +1404,8 @@ kernel_netlink_net_t *kernel_netlink_net_create()
{
private_kernel_netlink_net_t *this = malloc_thing(private_kernel_netlink_net_t);
struct sockaddr_nl addr;
enumerator_t *enumerator;
char *exclude;
/* public functions */
this->public.interface.get_interface = (char*(*)(kernel_net_t*,host_t*))get_interface_name;
@ -1384,6 +1432,28 @@ kernel_netlink_net_t *kernel_netlink_net_create()
this->install_virtual_ip = lib->settings->get_bool(lib->settings,
"charon.install_virtual_ip", TRUE);
this->rt_exclude = linked_list_create();
exclude = lib->settings->get_str(lib->settings,
"charon.ignore_routing_tables", NULL);
if (exclude)
{
char *token;
uintptr_t table;
enumerator = enumerator_create_token(exclude, " ", " ");
while (enumerator->enumerate(enumerator, &token))
{
errno = 0;
table = strtoul(token, NULL, 10);
if (errno == 0)
{
this->rt_exclude->insert_last(this->rt_exclude, (void*)table);
}
}
enumerator->destroy(enumerator);
}
this->socket = netlink_socket_create(NETLINK_ROUTE);
this->job = NULL;