add basic trill header description and basic header getter and setter
functions
Signed-off-by: Ahmed Amamou <ah...@gandi.net>
Signed-off-by: Emmanuel Hocdet <m...@gandi.net>
Signed-off-by: Kamel Haddadou <ka...@gandi.net>
---
include/net/if_trill.h | 88 +++++++++++++++++++++++++++++++++++++++++++
include/uapi/linux/if_ether.h | 1 +
2 files changed, 89 insertions(+)
create mode 100644 include/net/if_trill.h
diff --git a/include/net/if_trill.h b/include/net/if_trill.h
new file mode 100644
index 0000000..c4caf58
--- /dev/null
+++ b/include/net/if_trill.h
@@ -0,0 +1,88 @@
+#ifndef _LINUX_IF_TRILL_H_
+#define _LINUX_IF_TRILL_H_
+
+#include <linux/types.h>
+
+/* trill_hdr structure
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | V | R |M|op-Length| Hop Count |
+ *+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *| Egress RBridge Nickname | Ingress RBridge Nickname |
+ *+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+struct trill_hdr {
+ __be16 th_flags;
+ __be16 th_egressnick;
+ __be16 th_ingressnick;
+} __packed;
+
+static inline u16 trill_get_version(u16 trill_flags)
+{
+ return (trill_flags >> 14) & 0x0003;
+}
+
+static inline u16 trill_set_version(u16 trill_flags, u16 v)
+{
+ trill_flags |= (v & 0x0003) << 14;
+ return trill_flags;
+}
+
+static inline u16 trill_get_reserved(u16 trill_flags)
+{
+ return (trill_flags >> 12) & 0x0003;
+}
+
+static inline u16 trill_set_reserved(u16 trill_flags, u16 v)
+{
+ trill_flags |= (v & 0x0003) << 12;
+ return trill_flags;
+}
+
+static inline u16 trill_get_multidest(u16 trill_flags)
+{
+ return (trill_flags >> 11) & 0x0001;
+}
+
+static inline u16 trill_set_multidest(u16 trill_flags, u16 flag)
+{
+ trill_flags |= (flag & 0x0001) << 11;
+ return trill_flags;
+}
+
+/* len is in 4 bytes units << 2*/
+static inline size_t trill_get_optslen(u16 trill_flags)
+{
+ return ((trill_flags >> 6) & 0x001F) << 2;
+}
+
+static inline u16 trill_set_optslen(u16 trill_flags, u16 len)
+{
+ trill_flags |= ((len >> 2) & 0x001F) << 6;
+ return trill_flags;
+}
+
+static inline u16 trill_get_hopcount(u16 trill_flags)
+{
+ return trill_flags & 0x003F;
+}
+
+static inline u16 trill_set_hopcount(u16 trill_flags, u16 count)
+{
+ trill_flags |= count & 0x003F;
+ return trill_flags;
+}
+
+static inline void trillhdr_dec_hopcount(struct trill_hdr *trh)
+{
+ u8 *flags = (u8 *) &trh->th_flags;
+
+ if (flags[1] & 0x3F)
+ flags[1] -= 1;
+}
+
+static inline size_t trill_header_len(struct trill_hdr *trh)
+{
+ return sizeof(*trh) + trill_get_optslen(ntohs(trh->th_flags));
+}
+#endif /* _LINUX_IF_TRILL_H_ */
diff --git a/include/uapi/linux/if_ether.h b/include/uapi/linux/if_ether.h
index aa63ed0..5cd75b6 100644
--- a/include/uapi/linux/if_ether.h
+++ b/include/uapi/linux/if_ether.h
@@ -48,6 +48,7 @@
#define ETH_P_BPQ 0x08FF /* G8BPQ AX.25 Ethernet Packet
[ NOT AN OFFICIALLY REGISTERED ID ] */
#define ETH_P_IEEEPUP 0x0a00 /* Xerox IEEE802.3 PUP packet */
#define ETH_P_IEEEPUPAT 0x0a01 /* Xerox IEEE802.3 PUP Addr
Trans packet */
+#define ETH_P_TRILL 0x22F3 /* TRILL frames RFC 6325 */
#define ETH_P_BATMAN 0x4305 /* B.A.T.M.A.N.-Advanced packet [ NOT
AN OFFICIALLY REGISTERED ID ] */
#define ETH_P_DEC 0x6000 /* DEC Assigned proto */
#define ETH_P_DNA_DL 0x6001 /* DEC DNA Dump/Load */
--
2.1.4
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