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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.c: snap support
*
* Copyright (c) 2010 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.
*/
#include <vnet/vnet.h>
#include <vnet/snap/snap.h>
#include <vnet/ethernet/ethernet.h>
/* Global main structure. */
snap_main_t snap_main;
static u8 *
format_cisco_snap_protocol (u8 * s, va_list * args)
{
snap_header_t *h = va_arg (*args, snap_header_t *);
u16 protocol = clib_net_to_host_u16 (h->protocol);
char *t = 0;
switch (protocol)
{
#define _(n,f) case n: t = #f; break;
foreach_snap_cisco_protocol;
#undef _
default:
break;
}
if (t)
return format (s, "%s", t);
else
return format (s, "unknown 0x%x", protocol);
}
u8 *
format_snap_protocol (u8 * s, va_list * args)
{
snap_header_t *h = va_arg (*args, snap_header_t *);
u32 oui = snap_header_get_oui (h);
u16 protocol = clib_net_to_host_u16 (h->protocol);
switch (oui)
{
case IEEE_OUI_ethernet:
return format (s, "ethernet %U", format_ethernet_type, h->protocol);
case IEEE_OUI_cisco:
return format (s, "cisco %U", format_cisco_snap_protocol, h);
default:
return format (s, "oui 0x%06x 0x%04x", oui, protocol);
}
}
u8 *
format_snap_header_with_length (u8 * s, va_list * args)
{
snap_main_t *sm = &snap_main;
snap_header_t *h = va_arg (*args, snap_header_t *);
snap_protocol_info_t *pi = snap_get_protocol_info (sm, h);
u32 max_header_bytes = va_arg (*args, u32);
u32 indent, header_bytes;
header_bytes = sizeof (h[0]);
if (max_header_bytes != 0 && header_bytes > max_header_bytes)
return format (s, "snap header truncated");
indent = format_get_indent (s);
s = format (s, "SNAP %U", format_snap_protocol, h);
if (max_header_bytes != 0 && header_bytes > max_header_bytes && pi != 0)
{
vlib_node_t *node = vlib_get_node (sm->vlib_main, pi->node_index);
if (node->format_buffer)
s = format (s, "\n%U%U",
format_white_space, indent,
node->format_buffer, (void *) (h + 1),
max_header_bytes - header_bytes);
}
return s;
}
u8 *
format_snap_header (u8 * s, va_list * args)
{
snap_header_t *h = va_arg (*args, snap_header_t *);
return format (s, "%U", format_snap_header_with_length, h, 0);
}
/* Returns snap protocol as an int in host byte order. */
uword
unformat_snap_protocol (unformat_input_t * input, va_list * args)
{
snap_header_t *result = va_arg (*args, snap_header_t *);
snap_main_t *sm = &snap_main;
snap_oui_and_protocol_t p;
u32 i;
/* Numeric type. */
if (unformat (input, "0x%x 0x%x", &p.oui, &p.protocol))
{
if (p.oui >= (1 << 24))
return 0;
if (p.protocol >= (1 << 16))
return 0;
}
/* Named type. */
else if (unformat_user (input, unformat_vlib_number_by_name,
sm->protocol_info_by_name, &i))
{
snap_protocol_info_t *pi = vec_elt_at_index (sm->protocols, i);
p = pi->oui_and_protocol;
}
else
return 0;
snap_header_set_protocol (result, &p);
return 1;
}
uword
unformat_snap_header (unformat_input_t * input, va_list * args)
{
u8 **result = va_arg (*args, u8 **);
snap_header_t _h, *h = &_h;
if (!unformat (input, "%U", unformat_snap_protocol, h))
return 0;
/* Add header to result. */
{
void *p;
u32 n_bytes = sizeof (h[0]);
vec_add2 (*result, p, n_bytes);
clib_memcpy (p, h, n_bytes);
}
return 1;
}
static clib_error_t *
snap_init (vlib_main_t * vm)
{
snap_main_t *sm = &snap_main;
clib_memset (sm, 0, sizeof (sm[0]));
sm->vlib_main = vm;
mhash_init (&sm->protocol_hash, sizeof (uword),
sizeof (snap_oui_and_protocol_t));
sm->protocol_info_by_name
= hash_create_string ( /* elts */ 0, sizeof (uword));
return vlib_call_init_function (vm, snap_input_init);
}
VLIB_INIT_FUNCTION (snap_init) = {
.runs_after = VLIB_INITS ("llc_init"),
};
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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