First commit SR MPLS

Change-Id: I961685a2a0e4c314049444c64eb6ccf877c278dd
Signed-off-by: Pablo Camarillo <pcamaril@cisco.com>

1 files changed, 159 insertions, 0 deletions

diff --git a/src/vnet/srv6/sr_packet.h b/src/vnet/srv6/sr_packet.h
new file mode 100755
index 00000000000..7af4ad4d9c0
--- /dev/null
+++ b/src/vnet/srv6/sr_packet.h
@@ -0,0 +1,159 @@
+#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 */