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:
7 * http://www.apache.org/licenses/LICENSE-2.0
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.
16 * snap.c: snap support
18 * Copyright (c) 2010 Eliot Dresselhaus
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:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
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.
40 #include <vnet/vnet.h>
41 #include <vnet/snap/snap.h>
42 #include <vnet/ethernet/ethernet.h>
44 /* Global main structure. */
45 snap_main_t snap_main;
47 static u8 * format_cisco_snap_protocol (u8 * s, va_list * args)
49 snap_header_t * h = va_arg (*args, snap_header_t *);
50 u16 protocol = clib_net_to_host_u16 (h->protocol);
54 #define _(n,f) case n: t = #f; break;
55 foreach_snap_cisco_protocol;
60 return format (s, "%s", t);
62 return format (s, "unknown 0x%x", protocol);
65 u8 * format_snap_protocol (u8 * s, va_list * args)
67 snap_header_t * h = va_arg (*args, snap_header_t *);
68 u32 oui = snap_header_get_oui (h);
69 u16 protocol = clib_net_to_host_u16 (h->protocol);
73 case IEEE_OUI_ethernet:
74 return format (s, "ethernet %U", format_ethernet_type, h->protocol);
77 return format (s, "cisco %U", format_cisco_snap_protocol, h);
80 return format (s, "oui 0x%06x 0x%04x", oui, protocol);
84 u8 * format_snap_header_with_length (u8 * s, va_list * args)
86 snap_main_t * sm = &snap_main;
87 snap_header_t * h = va_arg (*args, snap_header_t *);
88 snap_protocol_info_t * pi = snap_get_protocol_info (sm, h);
89 u32 max_header_bytes = va_arg (*args, u32);
90 uword indent, header_bytes;
92 header_bytes = sizeof (h[0]);
93 if (max_header_bytes != 0 && header_bytes > max_header_bytes)
94 return format (s, "snap header truncated");
96 indent = format_get_indent (s);
98 s = format (s, "SNAP %U", format_snap_protocol, h);
100 if (max_header_bytes != 0 && header_bytes > max_header_bytes && pi != 0)
102 vlib_node_t * node = vlib_get_node (sm->vlib_main, pi->node_index);
103 if (node->format_buffer)
104 s = format (s, "\n%U%U",
105 format_white_space, indent,
106 node->format_buffer, (void *) (h + 1),
107 max_header_bytes - header_bytes);
113 u8 * format_snap_header (u8 * s, va_list * args)
115 snap_header_t * h = va_arg (*args, snap_header_t *);
116 return format (s, "%U", format_snap_header_with_length, h, 0);
119 /* Returns snap protocol as an int in host byte order. */
121 unformat_snap_protocol (unformat_input_t * input, va_list * args)
123 snap_header_t * result = va_arg (*args, snap_header_t *);
124 snap_main_t * sm = &snap_main;
125 snap_oui_and_protocol_t p;
129 if (unformat (input, "0x%x 0x%x", &p.oui, &p.protocol))
131 if (p.oui >= (1 << 24))
133 if (p.protocol >= (1 << 16))
138 else if (unformat_user (input, unformat_vlib_number_by_name,
139 sm->protocol_info_by_name, &i))
141 snap_protocol_info_t * pi = vec_elt_at_index (sm->protocols, i);
142 p = pi->oui_and_protocol;
148 snap_header_set_protocol (result, &p);
153 unformat_snap_header (unformat_input_t * input, va_list * args)
155 u8 ** result = va_arg (*args, u8 **);
156 snap_header_t _h, * h = &_h;
158 if (! unformat (input, "%U", unformat_snap_protocol, h))
161 /* Add header to result. */
164 u32 n_bytes = sizeof (h[0]);
166 vec_add2 (*result, p, n_bytes);
167 memcpy (p, h, n_bytes);
173 static clib_error_t * snap_init (vlib_main_t * vm)
175 snap_main_t * sm = &snap_main;
177 memset (sm, 0, sizeof (sm[0]));
180 mhash_init (&sm->protocol_hash, sizeof (uword), sizeof (snap_oui_and_protocol_t));
182 sm->protocol_info_by_name
183 = hash_create_string (/* elts */ 0, sizeof (uword));
185 return vlib_call_init_function (vm, snap_input_init);
188 VLIB_INIT_FUNCTION (snap_init);