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Limit recursion when searching for source addresses

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This could be required if e.g. two default routes list gateways but the
corresponding outbound interfaces do not have any IP addresses on them.
This commit is contained in:
Tobias Brunner 2012-11-12 19:39:34 +01:00
parent 5be88ca6bb
commit cbd52e7ddc
1 changed files with 14 additions and 5 deletions
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19
src/libhydra/plugins/kernel_netlink/kernel_netlink_net.c
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@ -65,6 +65,9 @@
/** delay before reinstalling routes (ms) */
#define ROUTE_DELAY 100
/** maximum recursion when searching for addresses in get_route() */
#define MAX_ROUTE_RECURSION 2
typedef struct addr_entry_t addr_entry_t;
/**
@ -1390,7 +1393,7 @@ static rt_entry_t *parse_route(struct nlmsghdr *hdr, rt_entry_t *route)
* Get a route: If "nexthop", the nexthop is returned. source addr otherwise.
*/
static host_t *get_route(private_kernel_netlink_net_t *this, host_t *dest,
bool nexthop, host_t *candidate)
bool nexthop, host_t *candidate, u_int recursion)
{
netlink_buf_t request;
struct nlmsghdr *hdr, *out, *current;
@ -1402,6 +1405,11 @@ static host_t *get_route(private_kernel_netlink_net_t *this, host_t *dest,
enumerator_t *enumerator;
host_t *addr = NULL;
if (recursion > MAX_ROUTE_RECURSION)
{
return NULL;
}
memset(&request, 0, sizeof(request));
hdr = (struct nlmsghdr*)request;
@ -1559,7 +1567,8 @@ static host_t *get_route(private_kernel_netlink_net_t *this, host_t *dest,
gtw = host_create_from_chunk(msg->rtm_family, route->gtw, 0);
if (gtw && !gtw->ip_equals(gtw, dest))
{
route->src_host = get_route(this, gtw, FALSE, candidate);
route->src_host = get_route(this, gtw, FALSE, candidate,
recursion + 1);
}
DESTROY_IF(gtw);
if (route->src_host)
@ -1600,7 +1609,7 @@ static host_t *get_route(private_kernel_netlink_net_t *this, host_t *dest,
DBG2(DBG_KNL, "using %H as %s to reach %H", addr,
nexthop ? "nexthop" : "address", dest);
}
else
else if (!recursion)
{
DBG2(DBG_KNL, "no %s found to reach %H",
nexthop ? "nexthop" : "address", dest);
@ -1611,13 +1620,13 @@ static host_t *get_route(private_kernel_netlink_net_t *this, host_t *dest,
METHOD(kernel_net_t, get_source_addr, host_t*,
private_kernel_netlink_net_t *this, host_t *dest, host_t *src)
{
return get_route(this, dest, FALSE, src);
return get_route(this, dest, FALSE, src, 0);
}
METHOD(kernel_net_t, get_nexthop, host_t*,
private_kernel_netlink_net_t *this, host_t *dest, host_t *src)
{
return get_route(this, dest, TRUE, src);
return get_route(this, dest, TRUE, src, 0);
}
/**