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/*
* Copyright (c) 2015 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.
*/
/*
* srp/packet.h: srp packet format.
*
* Copyright (c) 2008 Eliot Dresselhaus
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef included_srp_packet_h
#define included_srp_packet_h
#include <vppinfra/clib.h>
#include <vnet/ethernet/packet.h>
/* SRP version 2. */
#define foreach_srp_mode \
_ (reserved0) \
_ (reserved1) \
_ (reserved2) \
_ (reserved3) \
_ (control_pass_to_host) \
_ (control_locally_buffered_for_host) \
_ (keep_alive) \
_ (data)
typedef enum {
#define _(f) SRP_MODE_##f,
foreach_srp_mode
#undef _
SRP_N_MODE,
} srp_mode_t;
typedef union {
/* For computing parity bit. */
u16 as_u16;
struct {
u8 ttl;
#if CLIB_ARCH_IS_BIG_ENDIAN
u8 is_inner_ring : 1;
u8 mode : 3;
u8 priority : 3;
u8 parity : 1;
#endif
#if CLIB_ARCH_IS_LITTLE_ENDIAN
u8 parity : 1;
u8 priority : 3;
u8 mode : 3;
u8 is_inner_ring : 1;
#endif
};
} srp_header_t;
always_inline void
srp_header_compute_parity (srp_header_t * h)
{
h->parity = 0;
h->parity = count_set_bits (h->as_u16) ^ 1; /* odd parity */
}
typedef struct {
srp_header_t srp;
ethernet_header_t ethernet;
} srp_and_ethernet_header_t;
#define foreach_srp_control_packet_type \
_ (reserved) \
_ (topology) \
_ (ips)
typedef enum {
#define _(f) SRP_CONTROL_PACKET_TYPE_##f,
foreach_srp_control_packet_type
#undef _
SRP_N_CONTROL_PACKET_TYPE,
} srp_control_packet_type_t;
typedef CLIB_PACKED (struct {
/* Set to 0. */
u8 version;
srp_control_packet_type_t type : 8;
/* IP4-like checksum of packet starting with start of control header. */
u16 checksum;
u16 ttl;
}) srp_control_header_t;
typedef struct {
srp_header_t srp;
ethernet_header_t ethernet;
srp_control_header_t control;
} srp_generic_control_header_t;
typedef struct {
u8 flags;
#define SRP_TOPOLOGY_MAC_BINDING_FLAG_IS_INNER_RING (1 << 6)
#define SRP_TOPOLOGY_MAC_BINDING_FLAG_IS_WRAPPED (1 << 5)
/* MAC address. */
u8 address[6];
} srp_topology_mac_binding_t;
typedef CLIB_PACKED (struct {
srp_header_t srp;
ethernet_header_t ethernet;
srp_control_header_t control;
/* Length in bytes of data that follows. */
u16 n_bytes_of_data_that_follows;
/* MAC address of originator of this topology request. */
u8 originator_address[6];
/* Bindings follow. */
srp_topology_mac_binding_t bindings[0];
}) srp_topology_header_t;
#define foreach_srp_ips_request_type \
_ (idle, 0x0) \
_ (wait_to_restore, 0x5) \
_ (manual_switch, 0x6) \
_ (signal_degrade, 0x8) \
_ (signal_fail, 0xb) \
_ (forced_switch, 0xd)
typedef enum {
#define _(f,n) SRP_IPS_REQUEST_##f = n,
foreach_srp_ips_request_type
#undef _
} srp_ips_request_type_t;
#define foreach_srp_ips_status \
_ (idle, 0x0) \
_ (wrapped, 0x2)
typedef enum {
#define _(f,n) SRP_IPS_STATUS_##f = n,
foreach_srp_ips_status
#undef _
} srp_ips_status_t;
typedef struct {
srp_header_t srp;
ethernet_header_t ethernet;
srp_control_header_t control;
u8 originator_address[6];
union {
u8 ips_octet;
struct {
#if CLIB_ARCH_IS_BIG_ENDIAN
u8 request_type : 4;
u8 is_long_path : 1;
u8 status : 3;
#endif
#if CLIB_ARCH_IS_LITTLE_ENDIAN
u8 status : 3;
u8 is_long_path : 1;
u8 request_type : 4;
#endif
};
};
u8 reserved;
} srp_ips_header_t;
#endif /* included_srp_packet_h */
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