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.c: llc support
17 : *
18 : * Copyright (c) 2010 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 : #include <vnet/vnet.h>
41 : #include <vnet/llc/llc.h>
42 :
43 : /* Global main structure. */
44 : llc_main_t llc_main;
45 :
46 : u8 *
47 8 : format_llc_protocol (u8 * s, va_list * args)
48 : {
49 8 : llc_protocol_t p = va_arg (*args, u32);
50 8 : llc_main_t *pm = &llc_main;
51 8 : llc_protocol_info_t *pi = llc_get_protocol_info (pm, p);
52 :
53 8 : if (pi)
54 7 : s = format (s, "%s", pi->name);
55 : else
56 1 : s = format (s, "0x%02x", p);
57 :
58 8 : return s;
59 : }
60 :
61 : u8 *
62 4 : format_llc_header_with_length (u8 * s, va_list * args)
63 : {
64 4 : llc_main_t *pm = &llc_main;
65 4 : llc_header_t *h = va_arg (*args, llc_header_t *);
66 4 : u32 max_header_bytes = va_arg (*args, u32);
67 4 : llc_protocol_t p = h->dst_sap;
68 : u32 indent, header_bytes;
69 :
70 4 : header_bytes = llc_header_length (h);
71 4 : if (max_header_bytes != 0 && header_bytes > max_header_bytes)
72 0 : return format (s, "llc header truncated");
73 :
74 4 : indent = format_get_indent (s);
75 :
76 4 : s = format (s, "LLC %U -> %U",
77 4 : format_llc_protocol, h->src_sap,
78 4 : format_llc_protocol, h->dst_sap);
79 :
80 4 : if (h->control != 0x03)
81 1 : s = format (s, ", control 0x%x", llc_header_get_control (h));
82 :
83 4 : if (max_header_bytes != 0 && header_bytes > max_header_bytes)
84 : {
85 0 : llc_protocol_info_t *pi = llc_get_protocol_info (pm, p);
86 0 : vlib_node_t *node = vlib_get_node (pm->vlib_main, pi->node_index);
87 0 : if (node->format_buffer)
88 0 : s = format (s, "\n%U%U",
89 : format_white_space, indent,
90 0 : node->format_buffer, (void *) (h + 1),
91 : max_header_bytes - header_bytes);
92 : }
93 :
94 4 : return s;
95 : }
96 :
97 : u8 *
98 4 : format_llc_header (u8 * s, va_list * args)
99 : {
100 4 : llc_header_t *h = va_arg (*args, llc_header_t *);
101 4 : return format (s, "%U", format_llc_header_with_length, h, 0);
102 : }
103 :
104 : /* Returns llc protocol as an int in host byte order. */
105 : uword
106 0 : unformat_llc_protocol (unformat_input_t * input, va_list * args)
107 : {
108 0 : u8 *result = va_arg (*args, u8 *);
109 0 : llc_main_t *pm = &llc_main;
110 : int p, i;
111 :
112 : /* Numeric type. */
113 0 : if (unformat (input, "0x%x", &p) || unformat (input, "%d", &p))
114 : {
115 0 : if (p >= (1 << 8))
116 0 : return 0;
117 0 : *result = p;
118 0 : return 1;
119 : }
120 :
121 : /* Named type. */
122 0 : if (unformat_user (input, unformat_vlib_number_by_name,
123 : pm->protocol_info_by_name, &i))
124 : {
125 0 : llc_protocol_info_t *pi = vec_elt_at_index (pm->protocol_infos, i);
126 0 : *result = pi->protocol;
127 0 : return 1;
128 : }
129 :
130 0 : return 0;
131 : }
132 :
133 : uword
134 0 : unformat_llc_header (unformat_input_t * input, va_list * args)
135 : {
136 0 : u8 **result = va_arg (*args, u8 **);
137 0 : llc_header_t _h, *h = &_h;
138 : u8 p;
139 :
140 0 : if (!unformat (input, "%U", unformat_llc_protocol, &p))
141 0 : return 0;
142 :
143 0 : h->src_sap = h->dst_sap = p;
144 0 : h->control = 0x3;
145 :
146 : /* Add header to result. */
147 : {
148 : void *p;
149 0 : u32 n_bytes = sizeof (h[0]);
150 :
151 0 : vec_add2 (*result, p, n_bytes);
152 0 : clib_memcpy (p, h, n_bytes);
153 : }
154 :
155 0 : return 1;
156 : }
157 :
158 : static u8 *
159 0 : llc_build_rewrite (vnet_main_t * vnm,
160 : u32 sw_if_index,
161 : vnet_link_t link_type, const void *dst_address)
162 : {
163 : llc_header_t *h;
164 0 : u8 *rewrite = NULL;
165 : llc_protocol_t protocol;
166 :
167 0 : switch (link_type)
168 : {
169 : #define _(a,b) case VNET_LINK_##a: protocol = LLC_PROTOCOL_##b; break
170 0 : _(IP4, ip4);
171 : #undef _
172 0 : default:
173 0 : return (NULL);
174 : }
175 :
176 0 : vec_validate (rewrite, sizeof (*h) - 1);
177 0 : h = (llc_header_t *) rewrite;
178 0 : h->src_sap = h->dst_sap = protocol;
179 0 : h->control = 0x3;
180 :
181 0 : return (rewrite);
182 : }
183 :
184 : /* *INDENT-OFF* */
185 7279 : VNET_HW_INTERFACE_CLASS (llc_hw_interface_class) = {
186 : .name = "LLC",
187 : .format_header = format_llc_header_with_length,
188 : .unformat_header = unformat_llc_header,
189 : .build_rewrite = llc_build_rewrite,
190 : };
191 : /* *INDENT-ON* */
192 :
193 : static void
194 12298 : add_protocol (llc_main_t * pm, llc_protocol_t protocol, char *protocol_name)
195 : {
196 : llc_protocol_info_t *pi;
197 : u32 i;
198 :
199 12298 : vec_add2 (pm->protocol_infos, pi, 1);
200 12298 : i = pi - pm->protocol_infos;
201 :
202 12298 : pi->name = protocol_name;
203 12298 : pi->protocol = protocol;
204 12298 : pi->next_index = pi->node_index = ~0;
205 :
206 12298 : hash_set (pm->protocol_info_by_protocol, protocol, i);
207 24596 : hash_set_mem (pm->protocol_info_by_name, pi->name, i);
208 12298 : }
209 :
210 : static clib_error_t *
211 559 : llc_init (vlib_main_t * vm)
212 : {
213 : clib_error_t *error;
214 559 : llc_main_t *pm = &llc_main;
215 :
216 559 : clib_memset (pm, 0, sizeof (pm[0]));
217 559 : pm->vlib_main = vm;
218 :
219 559 : pm->protocol_info_by_name = hash_create_string (0, sizeof (uword));
220 559 : pm->protocol_info_by_protocol = hash_create (0, sizeof (uword));
221 :
222 : #define _(f,n) add_protocol (pm, LLC_PROTOCOL_##f, #f);
223 559 : foreach_llc_protocol;
224 : #undef _
225 :
226 559 : if ((error = vlib_call_init_function (vm, snap_init)))
227 0 : return error;
228 :
229 559 : return vlib_call_init_function (vm, llc_input_init);
230 : }
231 :
232 28559 : VLIB_INIT_FUNCTION (llc_init);
233 :
234 :
235 : /*
236 : * fd.io coding-style-patch-verification: ON
237 : *
238 : * Local Variables:
239 : * eval: (c-set-style "gnu")
240 : * End:
241 : */
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