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diff --git a/src/vnet/srv6/sr_packet.h b/src/vnet/srv6/sr_packet.h
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+#ifndef included_vnet_sr_packet_h
+#define included_vnet_sr_packet_h
+
+#include <vnet/ip/ip.h>
+
+/*
+ * ipv6 segment-routing header format
+ *
+ * Copyright (c) 2013 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * The Segment Routing Header (SRH) is defined as follows:
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Next Header | Hdr Ext Len | Routing Type | Segments Left |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | First Segment | Flags | RESERVED |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * | Segment List[0] (128 bits IPv6 address) |
+ * | |
+ * | |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * | |
+ * ...
+ * | |
+ * | |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * | Segment List[n] (128 bits IPv6 address) |
+ * | |
+ * | |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * // //
+ * // Optional Type Length Value objects (variable) //
+ * // //
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * where:
+ *
+ * o Next Header: 8-bit selector. Identifies the type of header
+ * immediately following the SRH.
+ *
+ * o Hdr Ext Len: 8-bit unsigned integer, is the length of the SRH
+ * header in 8-octet units, not including the first 8 octets.
+ *
+ * o Routing Type: TBD, to be assigned by IANA (suggested value: 4).
+ *
+ * o Segments Left. Defined in [RFC2460], it contains the index, in
+ * the Segment List, of the next segment to inspect. Segments Left
+ * is decremented at each segment.
+ *
+ * o First Segment: contains the index, in the Segment List, of the
+ * first segment of the path which is in fact the last element of the
+ * Segment List.
+ *
+ * o Flags: 8 bits of flags. Following flags are defined:
+ *
+ * 0 1 2 3 4 5 6 7
+ * +-+-+-+-+-+-+-+-+
+ * |U|P|O|A|H| U |
+ * +-+-+-+-+-+-+-+-+
+ *
+ * U: Unused and for future use. SHOULD be unset on transmission
+ * and MUST be ignored on receipt.
+ *
+ * P-flag: Protected flag. Set when the packet has been rerouted
+ * through FRR mechanism by an SR endpoint node.
+ *
+ * O-flag: OAM flag. When set, it indicates that this packet is
+ * an operations and management (OAM) packet.
+ *
+ * A-flag: Alert flag. If present, it means important Type Length
+ * Value (TLV) objects are present. See Section 3.1 for details
+ * on TLVs objects.
+ *
+ * H-flag: HMAC flag. If set, the HMAC TLV is present and is
+ * encoded as the last TLV of the SRH. In other words, the last
+ * 36 octets of the SRH represent the HMAC information. See
+ * Section 3.1.5 for details on the HMAC TLV.
+ *
+ * o RESERVED: SHOULD be unset on transmission and MUST be ignored on
+ * receipt.
+ *
+ * o Segment List[n]: 128 bit IPv6 addresses representing the nth
+ * segment in the Segment List. The Segment List is encoded starting
+ * from the last segment of the path. I.e., the first element of the
+ * segment list (Segment List [0]) contains the last segment of the
+ * path while the last segment of the Segment List (Segment List[n])
+ * contains the first segment of the path. The index contained in
+ * "Segments Left" identifies the current active segment.
+ *
+ * o Type Length Value (TLV) are described in Section 3.1.
+ *
+ */
+
+#ifndef IPPROTO_IPV6_ROUTE
+#define IPPROTO_IPV6_ROUTE 43
+#endif
+
+#define ROUTING_HEADER_TYPE_SR 4
+
+typedef struct
+{
+ /* Protocol for next header. */
+ u8 protocol;
+ /*
+ * Length of routing header in 8 octet units,
+ * not including the first 8 octets
+ */
+ u8 length;
+
+ /* Type of routing header; type 4 = segement routing */
+ u8 type;
+
+ /* Next segment in the segment list */
+ u8 segments_left;
+
+ /* Pointer to the first segment in the header */
+ u8 first_segment;
+
+ /* Flag bits */
+#define IP6_SR_HEADER_FLAG_PROTECTED (0x40)
+#define IP6_SR_HEADER_FLAG_OAM (0x20)
+#define IP6_SR_HEADER_FLAG_ALERT (0x10)
+#define IP6_SR_HEADER_FLAG_HMAC (0x80)
+
+ /* values 0x0, 0x4 - 0x7 are reserved */
+ u8 flags;
+ u16 reserved;
+
+ /* The segment elts */
+ ip6_address_t segments[0];
+} __attribute__ ((packed)) ip6_sr_header_t;
+
+/*
+* fd.io coding-style-patch-verification: ON
+*
+* Local Variables:
+* eval: (c-set-style "gnu")
+* End:
+*/
+
+#endif /* included_vnet_sr_packet_h */