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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>
178 lines
4.2 KiB
C
178 lines
4.2 KiB
C
#ifndef __NET_LWTUNNEL_H
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#define __NET_LWTUNNEL_H 1
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#include <linux/lwtunnel.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/types.h>
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#include <net/route.h>
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#define LWTUNNEL_HASH_BITS 7
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#define LWTUNNEL_HASH_SIZE (1 << LWTUNNEL_HASH_BITS)
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/* lw tunnel state flags */
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#define LWTUNNEL_STATE_OUTPUT_REDIRECT BIT(0)
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#define LWTUNNEL_STATE_INPUT_REDIRECT BIT(1)
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struct lwtunnel_state {
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__u16 type;
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__u16 flags;
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atomic_t refcnt;
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int (*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb);
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int (*orig_input)(struct sk_buff *);
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int len;
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__u8 data[0];
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};
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struct lwtunnel_encap_ops {
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int (*build_state)(struct net_device *dev, struct nlattr *encap,
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unsigned int family, const void *cfg,
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struct lwtunnel_state **ts);
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int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
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int (*input)(struct sk_buff *skb);
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int (*fill_encap)(struct sk_buff *skb,
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struct lwtunnel_state *lwtstate);
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int (*get_encap_size)(struct lwtunnel_state *lwtstate);
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int (*cmp_encap)(struct lwtunnel_state *a, struct lwtunnel_state *b);
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};
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#ifdef CONFIG_LWTUNNEL
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static inline void lwtstate_free(struct lwtunnel_state *lws)
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{
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kfree(lws);
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}
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static inline struct lwtunnel_state *
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lwtstate_get(struct lwtunnel_state *lws)
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{
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if (lws)
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atomic_inc(&lws->refcnt);
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return lws;
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}
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static inline void lwtstate_put(struct lwtunnel_state *lws)
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{
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if (!lws)
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return;
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if (atomic_dec_and_test(&lws->refcnt))
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lwtstate_free(lws);
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}
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static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
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{
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if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT))
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return true;
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return false;
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}
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static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
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{
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if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT))
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return true;
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return false;
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}
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int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
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unsigned int num);
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int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
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unsigned int num);
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int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
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struct nlattr *encap,
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unsigned int family, const void *cfg,
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struct lwtunnel_state **lws);
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int lwtunnel_fill_encap(struct sk_buff *skb,
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struct lwtunnel_state *lwtstate);
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int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
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struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
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int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
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int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb);
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int lwtunnel_input(struct sk_buff *skb);
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#else
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static inline void lwtstate_free(struct lwtunnel_state *lws)
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{
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}
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static inline struct lwtunnel_state *
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lwtstate_get(struct lwtunnel_state *lws)
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{
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return lws;
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}
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static inline void lwtstate_put(struct lwtunnel_state *lws)
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{
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}
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static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
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{
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return false;
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}
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static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
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{
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return false;
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}
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static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
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unsigned int num)
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{
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return -EOPNOTSUPP;
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}
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static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
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unsigned int num)
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{
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return -EOPNOTSUPP;
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}
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static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
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struct nlattr *encap,
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unsigned int family, const void *cfg,
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struct lwtunnel_state **lws)
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{
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return -EOPNOTSUPP;
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}
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static inline int lwtunnel_fill_encap(struct sk_buff *skb,
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struct lwtunnel_state *lwtstate)
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{
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return 0;
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}
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static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
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{
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return 0;
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}
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static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
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{
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return NULL;
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}
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static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
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struct lwtunnel_state *b)
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{
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return 0;
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}
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static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb)
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{
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return -EOPNOTSUPP;
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}
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static inline int lwtunnel_input(struct sk_buff *skb)
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{
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return -EOPNOTSUPP;
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}
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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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