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authorTom Herbert <tom@herbertland.com>2016-05-18 09:06:17 -0700
committerDavid S. Miller <davem@davemloft.net>2016-05-20 18:03:16 -0400
commit058214a4d1dfefed9f01a277fadd3590acb5f990 (patch)
tree7e5cf28fa708e770eb94af2223d09d6446d37fc2 /include
parent5f914b681253966612e052df364c3b8e4a3d5f63 (diff)
downloadlinux-058214a4d1dfefed9f01a277fadd3590acb5f990.tar.bz2
ip6_tun: Add infrastructure for doing encapsulation
Add encap_hlen and ip_tunnel_encap structure to ip6_tnl. Add functions for getting encap hlen, setting up encap on a tunnel, performing encapsulation operation. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/ip6_tunnel.h58
1 files changed, 58 insertions, 0 deletions
diff --git a/include/net/ip6_tunnel.h b/include/net/ip6_tunnel.h
index fb9e0153f4f2..d325c81332e3 100644
--- a/include/net/ip6_tunnel.h
+++ b/include/net/ip6_tunnel.h
@@ -52,10 +52,68 @@ struct ip6_tnl {
__u32 o_seqno; /* The last output seqno */
int hlen; /* tun_hlen + encap_hlen */
int tun_hlen; /* Precalculated header length */
+ int encap_hlen; /* Encap header length (FOU,GUE) */
+ struct ip_tunnel_encap encap;
int mlink;
+};
+struct ip6_tnl_encap_ops {
+ size_t (*encap_hlen)(struct ip_tunnel_encap *e);
+ int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
+ u8 *protocol, struct flowi6 *fl6);
};
+extern const struct ip6_tnl_encap_ops __rcu *
+ ip6tun_encaps[MAX_IPTUN_ENCAP_OPS];
+
+int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
+ unsigned int num);
+int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
+ unsigned int num);
+int ip6_tnl_encap_setup(struct ip6_tnl *t,
+ struct ip_tunnel_encap *ipencap);
+
+static inline int ip6_encap_hlen(struct ip_tunnel_encap *e)
+{
+ const struct ip6_tnl_encap_ops *ops;
+ int hlen = -EINVAL;
+
+ if (e->type == TUNNEL_ENCAP_NONE)
+ return 0;
+
+ if (e->type >= MAX_IPTUN_ENCAP_OPS)
+ return -EINVAL;
+
+ rcu_read_lock();
+ ops = rcu_dereference(ip6tun_encaps[e->type]);
+ if (likely(ops && ops->encap_hlen))
+ hlen = ops->encap_hlen(e);
+ rcu_read_unlock();
+
+ return hlen;
+}
+
+static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t,
+ u8 *protocol, struct flowi6 *fl6)
+{
+ const struct ip6_tnl_encap_ops *ops;
+ int ret = -EINVAL;
+
+ if (t->encap.type == TUNNEL_ENCAP_NONE)
+ return 0;
+
+ if (t->encap.type >= MAX_IPTUN_ENCAP_OPS)
+ return -EINVAL;
+
+ rcu_read_lock();
+ ops = rcu_dereference(ip6tun_encaps[t->encap.type]);
+ if (likely(ops && ops->build_header))
+ ret = ops->build_header(skb, &t->encap, protocol, fl6);
+ rcu_read_unlock();
+
+ return ret;
+}
+
/* Tunnel encapsulation limit destination sub-option */
struct ipv6_tlv_tnl_enc_lim {