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kernel-netlink: Implement passthrough type routes and use them on Linux

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Enables us to ignore any future kernel features for routes unless
we actually need to consider them for the source IP routes.

Also enables us to actually really skip IPsec processing for those networks
(because even the routes don't touch those packets). It's more what
users expect.

Co-authored-by: Tobias Brunner <[email protected]>
This commit is contained in:
Noel Kuntze
2020-03-10 10:20:58 +01:00
committed by Tobias Brunner
co-authored by Tobias Brunner
parent 4958acc0c2
commit 09f4bccfea
11 changed files with 124 additions and 80 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.c
+11 -3
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@@ -390,6 +390,9 @@ struct route_entry_t {
/** Destination net prefixlen */
uint8_t prefixlen;
/** Whether the route was installed for a passthrough policy */
bool pass;
};
/**
@@ -410,6 +413,7 @@ static void route_entry_destroy(route_entry_t *this)
static bool route_entry_equals(route_entry_t *a, route_entry_t *b)
{
if (a->if_name && b->if_name && streq(a->if_name, b->if_name) &&
a->pass == b->pass &&
a->src_ip->ip_equals(a->src_ip, b->src_ip) &&
chunk_equals(a->dst_net, b->dst_net) && a->prefixlen == b->prefixlen)
{
@@ -2614,6 +2618,7 @@ static void install_route(private_kernel_netlink_ipsec_t *this,
INIT(route,
.prefixlen = policy->sel.prefixlen_d,
.pass = mapping->type == POLICY_PASS,
);
if (charon->kernel->get_address_by_ts(charon->kernel, out->src_ts,
@@ -2664,7 +2669,8 @@ static void install_route(private_kernel_netlink_ipsec_t *this,
/* uninstall previously installed route */
if (charon->kernel->del_route(charon->kernel, old->dst_net,
old->prefixlen, old->gateway,
old->src_ip, old->if_name) != SUCCESS)
old->src_ip, old->if_name,
old->pass) != SUCCESS)
{
DBG1(DBG_KNL, "error uninstalling route installed with policy "
"%R === %R %N", out->src_ts, out->dst_ts, policy_dir_names,
@@ -2678,7 +2684,8 @@ static void install_route(private_kernel_netlink_ipsec_t *this,
route->gateway, route->src_ip, route->if_name);
switch (charon->kernel->add_route(charon->kernel, route->dst_net,
route->prefixlen, route->gateway,
route->src_ip, route->if_name))
route->src_ip, route->if_name,
route->pass))
{
default:
DBG1(DBG_KNL, "unable to install source route for %H",
@@ -3207,7 +3214,8 @@ METHOD(kernel_ipsec_t, del_policy, status_t,
route_entry_t *route = current->route;
if (charon->kernel->del_route(charon->kernel, route->dst_net,
route->prefixlen, route->gateway,
route->src_ip, route->if_name) != SUCCESS)
route->src_ip, route->if_name,
route->pass) != SUCCESS)
{
DBG1(DBG_KNL, "error uninstalling route installed with policy "
"%R === %R %N%s", id->src_ts, id->dst_ts, policy_dir_names,