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Vector Packet Processing
vxlan_gbp_packet.h
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1 /*
2  * Copyright (c) 2018 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 #ifndef __included_vxlan_gbp_packet_h__
16 #define __included_vxlan_gbp_packet_h__ 1
17 
18 #include <vlib/vlib.h>
19 
20 /*
21  * From draft-smith-vxlan-group-policy-04.txt
22  *
23  * 0 1 2 3
24  * 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
25  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
26  * |G|R|R|R|I|R|R|R|R|D|E|S|A|R|R|R| Group Policy ID |
27  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
28  * | VXLAN Network Identifier (VNI) | Reserved |
29  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
30  *
31  * G bit: Bit 0 of the initial word is defined as the G (Group Based
32  * Policy Extension) bit.
33  *
34  * I bit: where the I flag MUST be set to 1 for a valid
35  * VXLAN Network ID (VNI).
36  *
37  * D bit: Bit 9 of the initial word is defined as the Don't Learn bit.
38  * When set, this bit indicates that the egress VTEP MUST NOT learn the
39  * source address of the encapsulated frame.
40  *
41  * E bit: Bit 10 of the initial word is defined as the bounce packet.
42  * When set, this bit indicates that packet is bounced and must be
43  * dropped.
44  *
45  * S bit: Bit 11 of the initial word is defined as the source policy
46  * applied bit.
47  *
48  * A bit: Bit 12 of the initial word is defined as the A (Policy
49  * Applied) bit. This bit is only defined as the A bit when the G bit
50  * is set to 1.
51  *
52  * A = 1 indicates that the group policy has already been applied to
53  * this packet. Policies MUST NOT be applied by devices when the A
54  * bit is set.
55  *
56  * A = 0 indicates that the group policy has not been applied to this
57  * packet. Group policies MUST be applied by devices when the A bit
58  * is set to 0 and the destination Group has been determined.
59  * Devices that apply the Group policy MUST set the A bit to 1 after
60  * the policy has been applied.
61  *
62  * Group Policy ID: 16 bit identifier that indicates the source TSI
63  * Group membership being encapsulated by VXLAN. Its value is source
64  * class id.
65  *
66  */
67 
68 typedef struct
69 {
70  union
71  {
72  struct
73  {
74  union
75  {
76  struct
77  {
80  };
82  };
84  };
86  };
89 
90 #define foreach_vxlan_gbp_flags \
91  _ (0x80, G) \
92  _ (0x08, I)
93 
94 typedef enum
95 {
97 #define _(n,f) VXLAN_GBP_FLAGS_##f = n,
99 #undef _
100 } __attribute__ ((packed)) vxlan_gbp_flags_t;
101 
102 #define foreach_vxlan_gbp_gpflags \
103 _ (0x40, D) \
104 _ (0x20, E) \
105 _ (0x10, S) \
106 _ (0x08, A)
107 
108 typedef enum
109 {
111 #define _(n,f) VXLAN_GBP_GPFLAGS_##f = n,
113 #undef _
114 } __attribute__ ((packed)) vxlan_gbp_gpflags_t;
115 
116 static inline u32
118 {
119  u32 vni_reserved_host_byte_order;
120 
121  vni_reserved_host_byte_order = clib_net_to_host_u32 (h->vni_reserved);
122  return vni_reserved_host_byte_order >> 8;
123 }
124 
125 static inline u16
127 {
128  u16 sclass_host_byte_order;
129 
130  sclass_host_byte_order = clib_net_to_host_u16 (h->sclass);
131  return sclass_host_byte_order;
132 }
133 
134 static inline vxlan_gbp_gpflags_t
136 {
137  return h->gpflags;
138 }
139 
140 static inline vxlan_gbp_flags_t
142 {
143  return h->flag_g_i;
144 }
145 
146 static inline void
148 {
149  h->vni_reserved = clib_host_to_net_u32 (vni << 8);
150  h->flags_sclass_as_u32 = 0;
151  h->flag_g_i = VXLAN_GBP_FLAGS_I | VXLAN_GBP_FLAGS_G;
152 }
153 
154 extern u8 *format_vxlan_gbp_header_flags (u8 * s, va_list * args);
155 extern u8 *format_vxlan_gbp_header_gpflags (u8 * s, va_list * args);
156 
157 #endif /* __included_vxlan_gbp_packet_h__ */
158 
159 /*
160  * fd.io coding-style-patch-verification: ON
161  *
162  * Local Variables:
163  * eval: (c-set-style "gnu")
164  * End:
165  */
static void vxlan_gbp_set_header(vxlan_gbp_header_t *h, u32 vni)
vxlan_gbp_flags_t
u8 * format_vxlan_gbp_header_gpflags(u8 *s, va_list *args)
static vxlan_gbp_flags_t vxlan_gbp_get_flags(vxlan_gbp_header_t *h)
#define foreach_vxlan_gbp_gpflags
unsigned char u8
Definition: types.h:56
unsigned int u32
Definition: types.h:88
static vxlan_gbp_gpflags_t vxlan_gbp_get_gpflags(vxlan_gbp_header_t *h)
unsigned short u16
Definition: types.h:57
#define foreach_vxlan_gbp_flags
static u16 vxlan_gbp_get_sclass(vxlan_gbp_header_t *h)
vxlan_gbp_gpflags_t
static u32 vxlan_gbp_get_vni(vxlan_gbp_header_t *h)
u8 * format_vxlan_gbp_header_flags(u8 *s, va_list *args)
u32 vni
Definition: vxlan_gbp.api:36