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Diffstat (limited to 'src/vnet/srv6/sr_packet.h')
| -rwxr-xr-x | src/vnet/srv6/sr_packet.h | 159 |
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 00000000..7af4ad4d --- /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 */ |