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/*
* Copyright (c) 2018 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.
*/
#ifndef __included_vxlan_gbp_packet_h__
#define __included_vxlan_gbp_packet_h__ 1
#include <vlib/vlib.h>
/*
* From draft-smith-vxlan-group-policy-04.txt
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |G|R|R|R|I|R|R|R|R|D|E|S|A|R|R|R| Group Policy ID |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | VXLAN Network Identifier (VNI) | Reserved |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* G bit: Bit 0 of the initial word is defined as the G (Group Based
* Policy Extension) bit.
*
* I bit: where the I flag MUST be set to 1 for a valid
* VXLAN Network ID (VNI).
*
* D bit: Bit 9 of the initial word is defined as the Don't Learn bit.
* When set, this bit indicates that the egress VTEP MUST NOT learn the
* source address of the encapsulated frame.
*
* E bit: Bit 10 of the initial word is defined as the bounce packet.
* When set, this bit indicates that packet is bounced and must be
* dropped.
*
* S bit: Bit 11 of the initial word is defined as the source policy
* applied bit.
*
* A bit: Bit 12 of the initial word is defined as the A (Policy
* Applied) bit. This bit is only defined as the A bit when the G bit
* is set to 1.
*
* A = 1 indicates that the group policy has already been applied to
* this packet. Policies MUST NOT be applied by devices when the A
* bit is set.
*
* A = 0 indicates that the group policy has not been applied to this
* packet. Group policies MUST be applied by devices when the A bit
* is set to 0 and the destination Group has been determined.
* Devices that apply the Group policy MUST set the A bit to 1 after
* the policy has been applied.
*
* Group Policy ID: 16 bit identifier that indicates the source TSI
* Group membership being encapsulated by VXLAN. Its value is source
* class id.
*
* FOR INTERNAL USE ONLY
* R bit: Bit 12 of the initial word is defined as the reflection bit
* Set on packet rx checked on tx and dropped if set. this prevents
* packets recieved on an iVXLAN tunnel being reflected back to
* another.
*/
typedef struct
{
union
{
struct
{
union
{
struct
{
u8 flag_g_i;
u8 gpflags;
};
u16 flags;
};
u16 sclass;
};
u32 flags_sclass_as_u32;
};
u32 vni_reserved;
} vxlan_gbp_header_t;
#define foreach_vxlan_gbp_flags \
_ (0x80, G) \
_ (0x08, I)
typedef enum
{
VXLAN_GBP_FLAGS_NONE = 0,
#define _(n,f) VXLAN_GBP_FLAGS_##f = n,
foreach_vxlan_gbp_flags
#undef _
} __attribute__ ((packed)) vxlan_gbp_flags_t;
#define VXLAN_GBP_FLAGS_GI (VXLAN_GBP_FLAGS_G|VXLAN_GBP_FLAGS_I)
#define foreach_vxlan_gbp_gpflags \
_ (0x40, D) \
_ (0x20, E) \
_ (0x10, S) \
_ (0x08, A) \
_ (0x04, R)
typedef enum
{
VXLAN_GBP_GPFLAGS_NONE = 0,
#define _(n,f) VXLAN_GBP_GPFLAGS_##f = n,
foreach_vxlan_gbp_gpflags
#undef _
} __attribute__ ((packed)) vxlan_gbp_gpflags_t;
static inline u32
vxlan_gbp_get_vni (vxlan_gbp_header_t * h)
{
u32 vni_reserved_host_byte_order;
vni_reserved_host_byte_order = clib_net_to_host_u32 (h->vni_reserved);
return vni_reserved_host_byte_order >> 8;
}
static inline u16
vxlan_gbp_get_sclass (vxlan_gbp_header_t * h)
{
u16 sclass_host_byte_order;
sclass_host_byte_order = clib_net_to_host_u16 (h->sclass);
return sclass_host_byte_order;
}
static inline vxlan_gbp_gpflags_t
vxlan_gbp_get_gpflags (vxlan_gbp_header_t * h)
{
return h->gpflags;
}
static inline vxlan_gbp_flags_t
vxlan_gbp_get_flags (vxlan_gbp_header_t * h)
{
return h->flag_g_i;
}
static inline void
vxlan_gbp_set_header (vxlan_gbp_header_t * h, u32 vni)
{
h->vni_reserved = clib_host_to_net_u32 (vni << 8);
h->flags_sclass_as_u32 = 0;
h->flag_g_i = VXLAN_GBP_FLAGS_I | VXLAN_GBP_FLAGS_G;
}
extern u8 *format_vxlan_gbp_header_flags (u8 * s, va_list * args);
extern u8 *format_vxlan_gbp_header_gpflags (u8 * s, va_list * args);
#endif /* __included_vxlan_gbp_packet_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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