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/*
* Copyright (c) 2015 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.
*/
/*
* llc.h: LLC definitions
*
* Copyright (c) 2008 Eliot Dresselhaus
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef included_llc_h
#define included_llc_h
#include <vnet/vnet.h>
/* Protocol (SSAP/DSAP) types. */
#define foreach_llc_protocol \
_ (null, 0x0) \
_ (sublayer, 0x2) \
_ (sna_path_control, 0x4) \
_ (ip4, 0x6) \
_ (sna1, 0x8) \
_ (sna2, 0xc) \
_ (sna3, 0x40) \
_ (proway_lan, 0x0e) \
_ (netware1, 0x10) \
_ (netware2, 0xe0) \
_ (osi_layer1, 0x14) \
_ (osi_layer2, 0x20) \
_ (osi_layer3, 0x34) \
_ (osi_layer4, 0x54) \
_ (osi_layer5, 0xfe) \
_ (bpdu, 0x42) \
_ (arp, 0x98) \
_ (snap, 0xaa) \
_ (vines1, 0xba) \
_ (vines2, 0xbc) \
_ (netbios, 0xf0) \
_ (global_dsap, 0xff)
typedef enum
{
#define _(f,n) LLC_PROTOCOL_##f = n,
foreach_llc_protocol
#undef _
} llc_protocol_t;
typedef struct
{
#define LLC_DST_SAP_IS_GROUP (1 << 0)
#define LLC_SRC_SAP_IS_RESPONSE (1 << 0)
u8 dst_sap, src_sap;
/* Control byte.
[0] 1 => supervisory 0 => information
[1] unnumbered frame. */
u8 control;
/* Only present if (control & 3) != 3. */
u8 extended_control[0];
} llc_header_t;
always_inline u16
llc_header_get_control (llc_header_t * h)
{
u16 r = h->control;
return r | ((((r & 3) != 3) ? h->extended_control[0] : 0) << 8);
}
always_inline u8
llc_header_length (llc_header_t * h)
{
return ((h->control & 3) != 3 ? 4 : 3);
}
typedef struct
{
/* Name (a c string). */
char *name;
/* LLC protocol (SAP type). */
llc_protocol_t protocol;
/* Node which handles this type. */
u32 node_index;
/* Next index for this type. */
u32 next_index;
} llc_protocol_info_t;
#define foreach_llc_error \
_ (NONE, "no error") \
_ (UNKNOWN_PROTOCOL, "unknown llc ssap/dsap") \
_ (UNKNOWN_CONTROL, "control != 0x3")
typedef enum
{
#define _(f,s) LLC_ERROR_##f,
foreach_llc_error
#undef _
LLC_N_ERROR,
} llc_error_t;
typedef struct
{
vlib_main_t *vlib_main;
llc_protocol_info_t *protocol_infos;
/* Hash tables mapping name/protocol to protocol info index. */
uword *protocol_info_by_name, *protocol_info_by_protocol;
/* llc-input next index indexed by protocol. */
u8 input_next_by_protocol[256];
} llc_main_t;
always_inline llc_protocol_info_t *
llc_get_protocol_info (llc_main_t * m, llc_protocol_t protocol)
{
uword *p = hash_get (m->protocol_info_by_protocol, protocol);
return p ? vec_elt_at_index (m->protocol_infos, p[0]) : 0;
}
extern llc_main_t llc_main;
/* Register given node index to take input for given llc type. */
void
llc_register_input_protocol (vlib_main_t * vm,
llc_protocol_t protocol, u32 node_index);
format_function_t format_llc_protocol;
format_function_t format_llc_header;
format_function_t format_llc_header_with_length;
/* Parse llc protocol as 0xXXXX or protocol name. */
unformat_function_t unformat_llc_protocol;
/* Parse llc header. */
unformat_function_t unformat_llc_header;
unformat_function_t unformat_pg_llc_header;
#endif /* included_llc_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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