ipv6: sr: add code base for control plane support of SR-IPv6
This patch adds the necessary hooks and structures to provide support
for SR-IPv6 control plane, essentially the Generic Netlink commands
that will be used for userspace control over the Segment Routing
kernel structures.
The genetlink commands provide control over two different structures:
tunnel source and HMAC data. The tunnel source is the source address
that will be used by default when encapsulating packets into an
outer IPv6 header + SRH. If the tunnel source is set to :: then an
address of the outgoing interface will be selected as the source.
The HMAC commands currently just return ENOTSUPP and will be implemented
in a future patch.
Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/seg6_genl.h b/include/linux/seg6_genl.h
new file mode 100644
index 0000000..d6c3fb4f
--- /dev/null
+++ b/include/linux/seg6_genl.h
@@ -0,0 +1,6 @@
+#ifndef _LINUX_SEG6_GENL_H
+#define _LINUX_SEG6_GENL_H
+
+#include <uapi/linux/seg6_genl.h>
+
+#endif
diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index 10d0848..de7745e 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -85,6 +85,7 @@ struct netns_ipv6 {
#endif
atomic_t dev_addr_genid;
atomic_t fib6_sernum;
+ struct seg6_pernet_data *seg6_data;
};
#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
diff --git a/include/net/seg6.h b/include/net/seg6.h
index 4dd52a7..7c7b8ed 100644
--- a/include/net/seg6.h
+++ b/include/net/seg6.h
@@ -14,6 +14,9 @@
#ifndef _NET_SEG6_H
#define _NET_SEG6_H
+#include <linux/net.h>
+#include <linux/ipv6.h>
+
static inline void update_csum_diff4(struct sk_buff *skb, __be32 from,
__be32 to)
{
@@ -33,4 +36,17 @@ static inline void update_csum_diff16(struct sk_buff *skb, __be32 *from,
skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
}
+struct seg6_pernet_data {
+ struct mutex lock;
+ struct in6_addr __rcu *tun_src;
+};
+
+static inline struct seg6_pernet_data *seg6_pernet(struct net *net)
+{
+ return net->ipv6.seg6_data;
+}
+
+extern int seg6_init(void);
+extern void seg6_exit(void);
+
#endif
diff --git a/include/uapi/linux/seg6_genl.h b/include/uapi/linux/seg6_genl.h
new file mode 100644
index 0000000..fcf1c60
--- /dev/null
+++ b/include/uapi/linux/seg6_genl.h
@@ -0,0 +1,32 @@
+#ifndef _UAPI_LINUX_SEG6_GENL_H
+#define _UAPI_LINUX_SEG6_GENL_H
+
+#define SEG6_GENL_NAME "SEG6"
+#define SEG6_GENL_VERSION 0x1
+
+enum {
+ SEG6_ATTR_UNSPEC,
+ SEG6_ATTR_DST,
+ SEG6_ATTR_DSTLEN,
+ SEG6_ATTR_HMACKEYID,
+ SEG6_ATTR_SECRET,
+ SEG6_ATTR_SECRETLEN,
+ SEG6_ATTR_ALGID,
+ SEG6_ATTR_HMACINFO,
+ __SEG6_ATTR_MAX,
+};
+
+#define SEG6_ATTR_MAX (__SEG6_ATTR_MAX - 1)
+
+enum {
+ SEG6_CMD_UNSPEC,
+ SEG6_CMD_SETHMAC,
+ SEG6_CMD_DUMPHMAC,
+ SEG6_CMD_SET_TUNSRC,
+ SEG6_CMD_GET_TUNSRC,
+ __SEG6_CMD_MAX,
+};
+
+#define SEG6_CMD_MAX (__SEG6_CMD_MAX - 1)
+
+#endif
