2 * Copyright (c) 2010 Nicira Networks.
3 * Distributed under the terms of the GNU GPL version 2.
5 * Significant portions of this file may be copied from parts of the Linux
6 * kernel, by Linus Torvalds and others.
12 #include "openvswitch/tunnel.h"
17 * The absolute minimum fragment size. Note that there are many other
18 * definitions of the minimum MTU.
23 * One of these goes in your struct tnl_ops and in tnl_find_port().
24 * These values are in the same namespace as other TNL_T_* values, so
25 * you have only the first 10 bits to define protocol identifiers.
27 #define TNL_T_PROTO_GRE 0
29 /* You only need these flags when you are calling tnl_find_port(). */
30 #define TNL_T_KEY_EXACT (1 << 10)
31 #define TNL_T_KEY_MATCH (1 << 11)
32 #define TNL_T_KEY_EITHER (TNL_T_KEY_EXACT | TNL_T_KEY_MATCH)
34 struct tnl_mutable_config {
37 unsigned char eth_addr[ETH_ALEN];
39 struct tnl_port_config port_config;
41 /* Set of TNL_T_* flags that define the category for lookup. */
44 int tunnel_hlen; /* Tunnel header length. */
48 /* Put your TNL_T_PROTO_* type in here. */
53 * Returns the length of the tunnel header you will add in
54 * build_header() (i.e. excludes the IP header). Returns a negative
55 * error code if the configuration is invalid.
57 int (*hdr_len)(const struct tnl_port_config *);
60 * Returns a linked list of SKBs with tunnel headers (multiple
61 * packets may be generated in the event of fragmentation). Space
62 * will have already been allocated at the start of the packet equal
63 * to sizeof(struct iphdr) + value returned by hdr_len(). The IP
64 * header will have already been constructed.
66 struct sk_buff *(*build_header)(struct sk_buff *,
68 const struct tnl_mutable_config *,
74 struct tbl_node tbl_node;
77 const struct tnl_ops *tnl_ops;
79 /* Protected by RCU. */
80 struct tnl_mutable_config *mutable;
87 struct vport *tnl_create(const char *name, const void __user *config,
88 const struct vport_ops *,
89 const struct tnl_ops *);
90 int tnl_modify(struct vport *, const void __user *config);
91 int tnl_destroy(struct vport *);
92 int tnl_set_mtu(struct vport *vport, int mtu);
93 int tnl_set_addr(struct vport *vport, const unsigned char *addr);
94 const char *tnl_get_name(const struct vport *vport);
95 const unsigned char *tnl_get_addr(const struct vport *vport);
96 int tnl_get_mtu(const struct vport *vport);
97 int tnl_send(struct vport *vport, struct sk_buff *skb);
98 void tnl_rcv(struct vport *vport, struct sk_buff *skb);
100 struct vport *tnl_find_port(__be32 saddr, __be32 daddr, __be32 key,
102 const struct tnl_mutable_config **mutable);
103 bool tnl_frag_needed(struct vport *vport,
104 const struct tnl_mutable_config *mutable,
105 struct sk_buff *skb, unsigned int mtu, __be32 flow_key);
107 static inline struct tnl_vport *tnl_vport_priv(const struct vport *vport)
109 return vport_priv(vport);
112 #endif /* tunnel.h */