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             :  * snap.c: snap 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/snap/snap.h>
      42             : #include <vnet/ethernet/ethernet.h>
      43             : 
      44             : /* Global main structure. */
      45             : snap_main_t snap_main;
      46             : 
      47             : static u8 *
      48           3 : format_cisco_snap_protocol (u8 * s, va_list * args)
      49             : {
      50           3 :   snap_header_t *h = va_arg (*args, snap_header_t *);
      51           3 :   u16 protocol = clib_net_to_host_u16 (h->protocol);
      52           3 :   char *t = 0;
      53           3 :   switch (protocol)
      54             :     {
      55             : #define _(n,f) case n: t = #f; break;
      56           3 :       foreach_snap_cisco_protocol;
      57             : #undef _
      58           0 :     default:
      59           0 :       break;
      60             :     }
      61           3 :   if (t)
      62           3 :     return format (s, "%s", t);
      63             :   else
      64           0 :     return format (s, "unknown 0x%x", protocol);
      65             : }
      66             : 
      67             : u8 *
      68           3 : format_snap_protocol (u8 * s, va_list * args)
      69             : {
      70           3 :   snap_header_t *h = va_arg (*args, snap_header_t *);
      71           3 :   u32 oui = snap_header_get_oui (h);
      72           3 :   u16 protocol = clib_net_to_host_u16 (h->protocol);
      73             : 
      74           3 :   switch (oui)
      75             :     {
      76           0 :     case IEEE_OUI_ethernet:
      77           0 :       return format (s, "ethernet %U", format_ethernet_type, h->protocol);
      78             : 
      79           3 :     case IEEE_OUI_cisco:
      80           3 :       return format (s, "cisco %U", format_cisco_snap_protocol, h);
      81             : 
      82           0 :     default:
      83           0 :       return format (s, "oui 0x%06x 0x%04x", oui, protocol);
      84             :     }
      85             : }
      86             : 
      87             : u8 *
      88           3 : format_snap_header_with_length (u8 * s, va_list * args)
      89             : {
      90           3 :   snap_main_t *sm = &snap_main;
      91           3 :   snap_header_t *h = va_arg (*args, snap_header_t *);
      92           3 :   snap_protocol_info_t *pi = snap_get_protocol_info (sm, h);
      93           3 :   u32 max_header_bytes = va_arg (*args, u32);
      94             :   u32 indent, header_bytes;
      95             : 
      96           3 :   header_bytes = sizeof (h[0]);
      97           3 :   if (max_header_bytes != 0 && header_bytes > max_header_bytes)
      98           0 :     return format (s, "snap header truncated");
      99             : 
     100           3 :   indent = format_get_indent (s);
     101             : 
     102           3 :   s = format (s, "SNAP %U", format_snap_protocol, h);
     103             : 
     104           3 :   if (max_header_bytes != 0 && header_bytes > max_header_bytes && pi != 0)
     105             :     {
     106           0 :       vlib_node_t *node = vlib_get_node (sm->vlib_main, pi->node_index);
     107           0 :       if (node->format_buffer)
     108           0 :         s = format (s, "\n%U%U",
     109             :                     format_white_space, indent,
     110           0 :                     node->format_buffer, (void *) (h + 1),
     111             :                     max_header_bytes - header_bytes);
     112             :     }
     113             : 
     114           3 :   return s;
     115             : }
     116             : 
     117             : u8 *
     118           3 : format_snap_header (u8 * s, va_list * args)
     119             : {
     120           3 :   snap_header_t *h = va_arg (*args, snap_header_t *);
     121           3 :   return format (s, "%U", format_snap_header_with_length, h, 0);
     122             : }
     123             : 
     124             : /* Returns snap protocol as an int in host byte order. */
     125             : uword
     126           0 : unformat_snap_protocol (unformat_input_t * input, va_list * args)
     127             : {
     128           0 :   snap_header_t *result = va_arg (*args, snap_header_t *);
     129           0 :   snap_main_t *sm = &snap_main;
     130             :   snap_oui_and_protocol_t p;
     131             :   u32 i;
     132             : 
     133             :   /* Numeric type. */
     134           0 :   if (unformat (input, "0x%x 0x%x", &p.oui, &p.protocol))
     135             :     {
     136           0 :       if (p.oui >= (1 << 24))
     137           0 :         return 0;
     138           0 :       if (p.protocol >= (1 << 16))
     139           0 :         return 0;
     140             :     }
     141             : 
     142             :   /* Named type. */
     143           0 :   else if (unformat_user (input, unformat_vlib_number_by_name,
     144             :                           sm->protocol_info_by_name, &i))
     145             :     {
     146           0 :       snap_protocol_info_t *pi = vec_elt_at_index (sm->protocols, i);
     147           0 :       p = pi->oui_and_protocol;
     148             :     }
     149             : 
     150             :   else
     151           0 :     return 0;
     152             : 
     153           0 :   snap_header_set_protocol (result, &p);
     154           0 :   return 1;
     155             : }
     156             : 
     157             : uword
     158           0 : unformat_snap_header (unformat_input_t * input, va_list * args)
     159             : {
     160           0 :   u8 **result = va_arg (*args, u8 **);
     161           0 :   snap_header_t _h, *h = &_h;
     162             : 
     163           0 :   if (!unformat (input, "%U", unformat_snap_protocol, h))
     164           0 :     return 0;
     165             : 
     166             :   /* Add header to result. */
     167             :   {
     168             :     void *p;
     169           0 :     u32 n_bytes = sizeof (h[0]);
     170             : 
     171           0 :     vec_add2 (*result, p, n_bytes);
     172           0 :     clib_memcpy (p, h, n_bytes);
     173             :   }
     174             : 
     175           0 :   return 1;
     176             : }
     177             : 
     178             : static clib_error_t *
     179         559 : snap_init (vlib_main_t * vm)
     180             : {
     181         559 :   snap_main_t *sm = &snap_main;
     182             : 
     183         559 :   clib_memset (sm, 0, sizeof (sm[0]));
     184         559 :   sm->vlib_main = vm;
     185             : 
     186         559 :   mhash_init (&sm->protocol_hash, sizeof (uword),
     187             :               sizeof (snap_oui_and_protocol_t));
     188             : 
     189             :   sm->protocol_info_by_name
     190         559 :     = hash_create_string ( /* elts */ 0, sizeof (uword));
     191             : 
     192         559 :   return vlib_call_init_function (vm, snap_input_init);
     193             : }
     194             : 
     195       29679 : VLIB_INIT_FUNCTION (snap_init);
     196             : 
     197             : 
     198             : /*
     199             :  * fd.io coding-style-patch-verification: ON
     200             :  *
     201             :  * Local Variables:
     202             :  * eval: (c-set-style "gnu")
     203             :  * End:
     204             :  */