* limitations under the License.
*/
-/**
- * @file
- * @brief The Segment Routing Header (SRH).
- *
- * The Segment Routing Header (SRH) is defined in the diagram below.
- *
- *
- * 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 | HMAC Key ID |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * | |
- * | Segment List[0] (128 bits ipv6 address) |
- * | |
- * | |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * | |
- * | |
- * ...
- * | |
- * | |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * | |
- * | Segment List[n] (128 bits ipv6 address) |
- * | |
- * | |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * | |
- * | Policy List[0] (optional) |
- * | |
- * | |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * | |
- * | Policy List[1] (optional) |
- * | |
- * | |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * | |
- * | Policy List[2] (optional) |
- * | |
- * | |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * | |
- * | |
- * | |
- * | HMAC (256 bits) |
- * | (optional) |
- * | |
- * | |
- * | |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+/*
+ * 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 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 and it is used as an index in the
- * segment list.
- *
- * o First Segment: offset in the SRH, not including the first 8 octets
- * and expressed in 16-octet units, pointing to the last element of
- * the segment list, which is in fact the first segment of the
- * segment routing path.
- *
- * o Flags: 16 bits of flags. Following flags are defined:
- *
- * 1
- * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * |C|P|R|R| Policy Flags |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- *
- * C-flag: Clean-up flag. Set when the SRH has to be removed from
- * the packet when packet reaches the last segment.
- *
- * P-flag: Protected flag. Set when the packet has been rerouted
- * through FRR mechanism by a SR endpoint node. See Section 6.3
- * for more details.
- *
- * R-flags. Reserved and for future use.
- *
- * Policy Flags. Define the type of the IPv6 addresses encoded
- * into the Policy List (see below). The following have been
- * defined:
+ * is decremented at each segment.
*
- * Bits 4-6: determine the type of the first element after the
- * segment list.
+ * 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.
*
- * Bits 7-9: determine the type of the second element.
+ * o Flags: 8 bits of flags. Following flags are defined:
*
- * Bits 10-12: determine the type of the third element.
+ * 0 1 2 3 4 5 6 7
+ * +-+-+-+-+-+-+-+-+
+ * |U|P|O|A|H| U |
+ * +-+-+-+-+-+-+-+-+
*
- * Bits 13-15: determine the type of the fourth element.
+ * U: Unused and for future use. SHOULD be unset on transmission
+ * and MUST be ignored on receipt.
*
- * The following values are used for the type:
+ * P-flag: Protected flag. Set when the packet has been rerouted
+ * through FRR mechanism by an SR endpoint node.
*
- * 0x0: Not present. If value is set to 0x0, it means the
- * element represented by these bits is not present.
+ * O-flag: OAM flag. When set, it indicates that this packet is
+ * an operations and management (OAM) packet.
*
- * 0x1: SR Ingress.
+ * 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.
*
- * 0x2: SR Egress.
+ * 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.
*
- * 0x3: Original Source Address.
- *
- * o HMAC Key ID and HMAC field, and their use are defined in
- * [I-D.vyncke-6man-segment-routing-security].
+ * 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
* contains the first segment of the path. The index contained in
* "Segments Left" identifies the current active segment.
*
- * o Policy List. Optional addresses representing specific nodes in
- * the SR path such as:
- *
- * SR Ingress: a 128 bit generic identifier representing the
- * ingress in the SR domain (i.e.: it needs not to be a valid IPv6
- * address).
- *
- * SR Egress: a 128 bit generic identifier representing the egress
- * in the SR domain (i.e.: it needs not to be a valid IPv6
- * address).
- *
- * Original Source Address: IPv6 address originally present in the
- * SA field of the packet.
+ * o Type Length Value (TLV) are described in Section 3.1.
*
- * The segments in the Policy List are encoded after the segment list
- * and they are optional. If none are in the SRH, all bits of the
- * Policy List Flags MUST be set to 0x0.
*/
#ifndef IPPROTO_IPV6_ROUTE
#endif
#define ROUTING_HEADER_TYPE_SR 4
-/**
- @brief SR header struct.
-*/
+
typedef struct
{
- /** Protocol for next header. */
+ /* 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 */
+ /* Type of routing header; type 4 = segement routing */
u8 type;
- /** Next segment in the segment list */
+ /* Next segment in the segment list */
u8 segments_left;
- /**
- * Policy list pointer: offset in the SRH of the policy
- * list - in 16-octet units - not including the first 8 octets.
- */
+ /* Pointer to the first segment in the header */
u8 first_segment;
- /** Flag bits */
-#define IP6_SR_HEADER_FLAG_CLEANUP (0x8000)
- /** Flag bits */
-#define IP6_SR_HEADER_FLAG_PROTECTED (0x4000)
- /** Flag bits */
-#define IP6_SR_HEADER_FLAG_RESERVED (0x3000)
- /** Flag bits */
-#define IP6_SR_HEADER_FLAG_PL_ELT_NOT_PRESENT (0x0)
- /** Flag bits */
-#define IP6_SR_HEADER_FLAG_PL_ELT_INGRESS_PE (0x1)
- /** Flag bits */
-#define IP6_SR_HEADER_FLAG_PL_ELT_EGRESS_PE (0x2)
- /** Flag bits */
-#define IP6_SR_HEADER_FLAG_PL_ELT_ORIG_SRC_ADDR (0x3)
- /** values 0x4 - 0x7 are reserved */
- u16 flags;
- u8 hmac_key;
+ /* 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 + policy list elts */
+ /* The segment elts */
ip6_address_t segments[0];
} __attribute__ ((packed)) ip6_sr_header_t;
-static inline int
-ip6_sr_policy_list_shift_from_index (int pl_index)
-{
- return (-3 * pl_index) + 12;
-}
-
-/** pl_index is one-origined */
-static inline int
-ip6_sr_policy_list_flags (u16 flags_host_byte_order, int pl_index)
-{
- int shift;
-
- if (pl_index <= 0 || pl_index > 4)
- return 0;
-
- shift = (-3 * pl_index) + 12;
- flags_host_byte_order >>= shift;
-
- return (flags_host_byte_order & 7);
-}
+/*
+* fd.io coding-style-patch-verification: ON
+*
+* Local Variables:
+* eval: (c-set-style "gnu")
+* End:
+*/
#endif /* included_vnet_sr_packet_h */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */
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