lwtunnel: autoload of lwt modules
The lwt implementations using net devices can autoload using the existing mechanism using IFLA_INFO_KIND. However, there's no mechanism that lwt modules not using net devices can use. Therefore, add the ability to autoload modules registering lwt operations for lwt implementations not using a net device so that users don't have to manually load the modules. Only users with the CAP_NET_ADMIN capability can cause modules to be loaded, which is ensured by rtnetlink_rcv_msg rejecting non-RTM_GETxxx messages for users without this capability, and by lwtunnel_build_state not being called in response to RTM_GETxxx messages. Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
e817af27e0
commit
745041e2aa
@ -170,6 +170,8 @@ static inline int lwtunnel_input(struct sk_buff *skb)
|
|||||||
return -EOPNOTSUPP;
|
return -EOPNOTSUPP;
|
||||||
}
|
}
|
||||||
|
|
||||||
#endif
|
#endif /* CONFIG_LWTUNNEL */
|
||||||
|
|
||||||
|
#define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type))
|
||||||
|
|
||||||
#endif /* __NET_LWTUNNEL_H */
|
#endif /* __NET_LWTUNNEL_H */
|
||||||
|
@ -27,6 +27,31 @@
|
|||||||
#include <net/rtnetlink.h>
|
#include <net/rtnetlink.h>
|
||||||
#include <net/ip6_fib.h>
|
#include <net/ip6_fib.h>
|
||||||
|
|
||||||
|
#ifdef CONFIG_MODULES
|
||||||
|
|
||||||
|
static const char *lwtunnel_encap_str(enum lwtunnel_encap_types encap_type)
|
||||||
|
{
|
||||||
|
/* Only lwt encaps implemented without using an interface for
|
||||||
|
* the encap need to return a string here.
|
||||||
|
*/
|
||||||
|
switch (encap_type) {
|
||||||
|
case LWTUNNEL_ENCAP_MPLS:
|
||||||
|
return "MPLS";
|
||||||
|
case LWTUNNEL_ENCAP_ILA:
|
||||||
|
return "ILA";
|
||||||
|
case LWTUNNEL_ENCAP_IP6:
|
||||||
|
case LWTUNNEL_ENCAP_IP:
|
||||||
|
case LWTUNNEL_ENCAP_NONE:
|
||||||
|
case __LWTUNNEL_ENCAP_MAX:
|
||||||
|
/* should not have got here */
|
||||||
|
WARN_ON(1);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
#endif /* CONFIG_MODULES */
|
||||||
|
|
||||||
struct lwtunnel_state *lwtunnel_state_alloc(int encap_len)
|
struct lwtunnel_state *lwtunnel_state_alloc(int encap_len)
|
||||||
{
|
{
|
||||||
struct lwtunnel_state *lws;
|
struct lwtunnel_state *lws;
|
||||||
@ -85,6 +110,18 @@ int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
|
|||||||
ret = -EOPNOTSUPP;
|
ret = -EOPNOTSUPP;
|
||||||
rcu_read_lock();
|
rcu_read_lock();
|
||||||
ops = rcu_dereference(lwtun_encaps[encap_type]);
|
ops = rcu_dereference(lwtun_encaps[encap_type]);
|
||||||
|
#ifdef CONFIG_MODULES
|
||||||
|
if (!ops) {
|
||||||
|
const char *encap_type_str = lwtunnel_encap_str(encap_type);
|
||||||
|
|
||||||
|
if (encap_type_str) {
|
||||||
|
rcu_read_unlock();
|
||||||
|
request_module("rtnl-lwt-%s", encap_type_str);
|
||||||
|
rcu_read_lock();
|
||||||
|
ops = rcu_dereference(lwtun_encaps[encap_type]);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
#endif
|
||||||
if (likely(ops && ops->build_state))
|
if (likely(ops && ops->build_state))
|
||||||
ret = ops->build_state(dev, encap, family, cfg, lws);
|
ret = ops->build_state(dev, encap, family, cfg, lws);
|
||||||
rcu_read_unlock();
|
rcu_read_unlock();
|
||||||
|
Loading…
Reference in New Issue
Block a user