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>
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@ -170,6 +170,8 @@ static inline int lwtunnel_input(struct sk_buff *skb)
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return -EOPNOTSUPP;
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}
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#endif
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#endif /* CONFIG_LWTUNNEL */
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#define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type))
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#endif /* __NET_LWTUNNEL_H */
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@ -27,6 +27,31 @@
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#include <net/rtnetlink.h>
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#include <net/ip6_fib.h>
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#ifdef CONFIG_MODULES
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static const char *lwtunnel_encap_str(enum lwtunnel_encap_types encap_type)
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{
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/* Only lwt encaps implemented without using an interface for
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* the encap need to return a string here.
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*/
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switch (encap_type) {
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case LWTUNNEL_ENCAP_MPLS:
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return "MPLS";
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case LWTUNNEL_ENCAP_ILA:
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return "ILA";
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case LWTUNNEL_ENCAP_IP6:
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case LWTUNNEL_ENCAP_IP:
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case LWTUNNEL_ENCAP_NONE:
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case __LWTUNNEL_ENCAP_MAX:
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/* should not have got here */
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WARN_ON(1);
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break;
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}
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return NULL;
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}
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#endif /* CONFIG_MODULES */
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struct lwtunnel_state *lwtunnel_state_alloc(int encap_len)
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{
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struct lwtunnel_state *lws;
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@ -85,6 +110,18 @@ int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
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ret = -EOPNOTSUPP;
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rcu_read_lock();
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ops = rcu_dereference(lwtun_encaps[encap_type]);
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#ifdef CONFIG_MODULES
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if (!ops) {
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const char *encap_type_str = lwtunnel_encap_str(encap_type);
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if (encap_type_str) {
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rcu_read_unlock();
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request_module("rtnl-lwt-%s", encap_type_str);
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rcu_read_lock();
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ops = rcu_dereference(lwtun_encaps[encap_type]);
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}
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}
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#endif
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if (likely(ops && ops->build_state))
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ret = ops->build_state(dev, encap, family, cfg, lws);
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rcu_read_unlock();
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