Line data Source code
1 : /*
2 : * Copyright (c) 2015 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 : /*
16 : * llc.h: LLC definitions
17 : *
18 : * Copyright (c) 2008 Eliot Dresselhaus
19 : *
20 : * Permission is hereby granted, free of charge, to any person obtaining
21 : * a copy of this software and associated documentation files (the
22 : * "Software"), to deal in the Software without restriction, including
23 : * without limitation the rights to use, copy, modify, merge, publish,
24 : * distribute, sublicense, and/or sell copies of the Software, and to
25 : * permit persons to whom the Software is furnished to do so, subject to
26 : * the following conditions:
27 : *
28 : * The above copyright notice and this permission notice shall be
29 : * included in all copies or substantial portions of the Software.
30 : *
31 : * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 : * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 : * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 : * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 : * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 : * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 : * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38 : */
39 :
40 : #ifndef included_llc_h
41 : #define included_llc_h
42 :
43 : #include <vnet/vnet.h>
44 :
45 : /* Protocol (SSAP/DSAP) types. */
46 : #define foreach_llc_protocol \
47 : _ (null, 0x0) \
48 : _ (sublayer, 0x2) \
49 : _ (sna_path_control, 0x4) \
50 : _ (ip4, 0x6) \
51 : _ (sna1, 0x8) \
52 : _ (sna2, 0xc) \
53 : _ (sna3, 0x40) \
54 : _ (proway_lan, 0x0e) \
55 : _ (netware1, 0x10) \
56 : _ (netware2, 0xe0) \
57 : _ (osi_layer1, 0x14) \
58 : _ (osi_layer2, 0x20) \
59 : _ (osi_layer3, 0x34) \
60 : _ (osi_layer4, 0x54) \
61 : _ (osi_layer5, 0xfe) \
62 : _ (bpdu, 0x42) \
63 : _ (arp, 0x98) \
64 : _ (snap, 0xaa) \
65 : _ (vines1, 0xba) \
66 : _ (vines2, 0xbc) \
67 : _ (netbios, 0xf0) \
68 : _ (global_dsap, 0xff)
69 :
70 : typedef enum
71 : {
72 : #define _(f,n) LLC_PROTOCOL_##f = n,
73 : foreach_llc_protocol
74 : #undef _
75 : } llc_protocol_t;
76 :
77 : typedef struct
78 : {
79 : #define LLC_DST_SAP_IS_GROUP (1 << 0)
80 : #define LLC_SRC_SAP_IS_RESPONSE (1 << 0)
81 : u8 dst_sap, src_sap;
82 :
83 : /* Control byte.
84 : [0] 1 => supervisory 0 => information
85 : [1] unnumbered frame. */
86 : u8 control;
87 :
88 : /* Only present if (control & 3) != 3. */
89 : u8 extended_control[0];
90 : } llc_header_t;
91 :
92 : always_inline u16
93 1 : llc_header_get_control (llc_header_t * h)
94 : {
95 1 : u16 r = h->control;
96 1 : return r | ((((r & 3) != 3) ? h->extended_control[0] : 0) << 8);
97 : }
98 :
99 : always_inline u8
100 8 : llc_header_length (llc_header_t * h)
101 : {
102 8 : return ((h->control & 3) != 3 ? 4 : 3);
103 : }
104 :
105 : typedef struct
106 : {
107 : /* Name (a c string). */
108 : char *name;
109 :
110 : /* LLC protocol (SAP type). */
111 : llc_protocol_t protocol;
112 :
113 : /* Node which handles this type. */
114 : u32 node_index;
115 :
116 : /* Next index for this type. */
117 : u32 next_index;
118 : } llc_protocol_info_t;
119 :
120 : #define foreach_llc_error \
121 : _ (NONE, "no error") \
122 : _ (UNKNOWN_PROTOCOL, "unknown llc ssap/dsap") \
123 : _ (UNKNOWN_CONTROL, "control != 0x3")
124 :
125 : typedef enum
126 : {
127 : #define _(f,s) LLC_ERROR_##f,
128 : foreach_llc_error
129 : #undef _
130 : LLC_N_ERROR,
131 : } llc_error_t;
132 :
133 : typedef struct
134 : {
135 : vlib_main_t *vlib_main;
136 :
137 : llc_protocol_info_t *protocol_infos;
138 :
139 : /* Hash tables mapping name/protocol to protocol info index. */
140 : uword *protocol_info_by_name, *protocol_info_by_protocol;
141 :
142 : /* llc-input next index indexed by protocol. */
143 : u8 input_next_by_protocol[256];
144 : } llc_main_t;
145 :
146 : always_inline llc_protocol_info_t *
147 3362 : llc_get_protocol_info (llc_main_t * m, llc_protocol_t protocol)
148 : {
149 3362 : uword *p = hash_get (m->protocol_info_by_protocol, protocol);
150 3362 : return p ? vec_elt_at_index (m->protocol_infos, p[0]) : 0;
151 : }
152 :
153 : extern llc_main_t llc_main;
154 :
155 : /* Register given node index to take input for given llc type. */
156 : void
157 : llc_register_input_protocol (vlib_main_t * vm,
158 : llc_protocol_t protocol, u32 node_index);
159 :
160 : format_function_t format_llc_protocol;
161 : format_function_t format_llc_header;
162 : format_function_t format_llc_header_with_length;
163 :
164 : /* Parse llc protocol as 0xXXXX or protocol name. */
165 : unformat_function_t unformat_llc_protocol;
166 :
167 : /* Parse llc header. */
168 : unformat_function_t unformat_llc_header;
169 : unformat_function_t unformat_pg_llc_header;
170 :
171 : #endif /* included_llc_h */
172 :
173 : /*
174 : * fd.io coding-style-patch-verification: ON
175 : *
176 : * Local Variables:
177 : * eval: (c-set-style "gnu")
178 : * End:
179 : */
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