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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.
*/
/*
* snap.h: SNAP 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_snap_h
#define included_snap_h
#include <vnet/vnet.h>
#include <vnet/pg/pg.h>
#define foreach_ieee_oui \
_ (0x000000, ethernet) \
_ (0x00000c, cisco)
typedef enum
{
#define _(n,f) IEEE_OUI_##f = n,
foreach_ieee_oui
#undef _
} ieee_oui_t;
#define foreach_snap_cisco_protocol \
_ (0x0102, drip) \
_ (0x0104, port_aggregation_protocol) \
_ (0x0105, mls_hello) \
_ (0x010b, per_vlan_spanning_tree) \
_ (0x010c, vlan_bridge) \
_ (0x0111, unidirectional_link_detection) \
_ (0x2000, cdp) \
_ (0x2001, cgmp) \
_ (0x2003, vtp) \
_ (0x2004, dtp) \
_ (0x200a, stp_uplink_fast)
typedef enum
{
#define _(n,f) SNAP_cisco_##f = n,
foreach_snap_cisco_protocol
#undef _
} snap_cisco_protocol_t;
typedef union
{
/* *INDENT-OFF* */
CLIB_PACKED (struct {
/* OUI: organization unique identifier. */
u8 oui[3];
/* Per-OUI protocol. */
u16 protocol;
});
/* *INDENT-ON* */
u8 as_u8[5];
} snap_header_t;
typedef struct
{
u32 oui;
u32 protocol;
} snap_oui_and_protocol_t;
typedef struct
{
/* Name vector string. */
u8 *name;
snap_oui_and_protocol_t oui_and_protocol;
/* Node which handles this type. */
u32 node_index;
/* snap-input next index for this type. */
u32 next_index;
} snap_protocol_info_t;
always_inline void
snap_header_set_protocol (snap_header_t * h, snap_oui_and_protocol_t * p)
{
u16 protocol = p->protocol;
u32 oui = p->oui;
h->protocol = clib_host_to_net_u16 (protocol);
h->oui[0] = (oui >> 16) & 0xff;
h->oui[1] = (oui >> 8) & 0xff;
h->oui[2] = (oui >> 0) & 0xff;
}
#define foreach_snap_error \
_ (NONE, "no error") \
_ (UNKNOWN_PROTOCOL, "unknown oui/snap protocol")
typedef enum
{
#define _(f,s) SNAP_ERROR_##f,
foreach_snap_error
#undef _
SNAP_N_ERROR,
} snap_error_t;
typedef struct
{
vlib_main_t *vlib_main;
/* Vector of known SNAP oui/protocol pairs. */
snap_protocol_info_t *protocols;
/* Hash table mapping oui/protocol to protocol index. */
mhash_t protocol_hash;
/* Hash table mapping protocol by name. */
uword *protocol_info_by_name;
} snap_main_t;
always_inline u32
snap_header_get_oui (snap_header_t * h)
{
return (h->oui[0] << 16) | (h->oui[1] << 8) | h->oui[2];
}
always_inline snap_protocol_info_t *
snap_get_protocol_info (snap_main_t * sm, snap_header_t * h)
{
snap_oui_and_protocol_t key;
uword *p;
key.oui = snap_header_get_oui (h);
key.protocol = h->protocol;
p = mhash_get (&sm->protocol_hash, &key);
return p ? vec_elt_at_index (sm->protocols, p[0]) : 0;
}
extern snap_main_t snap_main;
/* Register given node index to take input for given snap type. */
void
snap_register_input_protocol (vlib_main_t * vm,
char *name,
u32 ieee_oui, u16 protocol, u32 node_index);
format_function_t format_snap_protocol;
format_function_t format_snap_header;
format_function_t format_snap_header_with_length;
/* Parse snap protocol as 0xXXXX or protocol name. */
unformat_function_t unformat_snap_protocol;
/* Parse snap header. */
unformat_function_t unformat_snap_header;
unformat_function_t unformat_pg_snap_header;
always_inline void
snap_setup_node (vlib_main_t * vm, u32 node_index)
{
vlib_node_t *n = vlib_get_node (vm, node_index);
pg_node_t *pn = pg_get_node (node_index);
n->format_buffer = format_snap_header_with_length;
n->unformat_buffer = unformat_snap_header;
pn->unformat_edit = unformat_pg_snap_header;
}
#endif /* included_snap_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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