src/vnet/ethernet/p2p_ethernet.c

   1 /*
   2  * p2p_ethernet.c: p2p ethernet
   3  *
   4  * Copyright (c) 2012 Cisco and/or its affiliates.
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at:
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include <vppinfra/bihash_16_8.h>
  19 #include <vnet/vnet.h>
  20 #include <vnet/ethernet/p2p_ethernet.h>
  21 #include <vnet/l2/l2_input.h>
  22
  23 p2p_ethernet_main_t p2p_main;
  24
  25 static void
  26 create_p2pe_key (p2p_key_t * p2pe_key, u32 parent_if_index, u8 * client_mac)
  27 {
  28   clib_memcpy (p2pe_key->mac, client_mac, 6);
  29   p2pe_key->pad1 = 0;
  30   p2pe_key->hw_if_index = parent_if_index;
  31   p2pe_key->pad2 = 0;
  32 }
  33
  34 u32
  35 p2p_ethernet_lookup (u32 parent_if_index, u8 * client_mac)
  36 {
  37   p2p_ethernet_main_t *p2pm = &p2p_main;
  38   p2p_key_t p2pe_key;
  39   uword *p;
  40
  41   create_p2pe_key (&p2pe_key, parent_if_index, client_mac);
  42   p = hash_get_mem (p2pm->p2p_ethernet_by_key, &p2pe_key);
  43   if (p)
  44     return p[0];
  45
  46   return ~0;
  47 }
  48
  49 int
  50 p2p_ethernet_add_del (vlib_main_t * vm, u32 parent_if_index,
  51                       u8 * client_mac, u32 p2pe_subif_id, int is_add,
  52                       u32 * p2pe_if_index)
  53 {
  54   vnet_main_t *vnm = vnet_get_main ();
  55   p2p_ethernet_main_t *p2pm = &p2p_main;
  56   vnet_interface_main_t *im = &vnm->interface_main;
  57
  58   u32 p2pe_sw_if_index = ~0;
  59   p2pe_sw_if_index = p2p_ethernet_lookup (parent_if_index, client_mac);
  60
  61   if (p2pe_if_index)
  62     *p2pe_if_index = ~0;
  63
  64   if (is_add)
  65     {
  66       if (p2pe_sw_if_index == ~0)
  67         {
  68           vnet_hw_interface_t *hi;
  69
  70           hi = vnet_get_hw_interface (vnm, parent_if_index);
  71           if (hi->bond_info == VNET_HW_INTERFACE_BOND_INFO_SLAVE)
  72             return VNET_API_ERROR_BOND_SLAVE_NOT_ALLOWED;
  73
  74           u64 sup_and_sub_key =
  75             ((u64) (hi->sw_if_index) << 32) | (u64) p2pe_subif_id;
  76           uword *p;
  77           p = hash_get_mem (im->sw_if_index_by_sup_and_sub, &sup_and_sub_key);
  78           if (p)
  79             {
  80               if (CLIB_DEBUG > 0)
  81                 clib_warning
  82                   ("p2p ethernet sub-interface on sw_if_index %d with sub id %d already exists\n",
  83                    hi->sw_if_index, p2pe_subif_id);
  84               return VNET_API_ERROR_SUBIF_ALREADY_EXISTS;
  85             }
  86           vnet_sw_interface_t template = {
  87             .type = VNET_SW_INTERFACE_TYPE_P2P,
  88             .flood_class = VNET_FLOOD_CLASS_NORMAL,
  89             .sup_sw_if_index = hi->sw_if_index,
  90             .sub.id = p2pe_subif_id
  91           };
  92
  93           clib_memcpy (template.p2p.client_mac, client_mac,
  94                        sizeof (template.p2p.client_mac));
  95
  96           if (vnet_create_sw_interface (vnm, &template, &p2pe_sw_if_index))
  97             return VNET_API_ERROR_SUBIF_CREATE_FAILED;
  98
  99           /* Allocate counters for this interface. */
 100           {
 101             u32 i;
 102
 103             vnet_interface_counter_lock (im);
 104
 105             for (i = 0; i < vec_len (im->sw_if_counters); i++)
 106               {
 107                 vlib_validate_simple_counter (&im->sw_if_counters[i],
 108                                               p2pe_sw_if_index);
 109                 vlib_zero_simple_counter (&im->sw_if_counters[i],
 110                                           p2pe_sw_if_index);
 111               }
 112
 113             for (i = 0; i < vec_len (im->combined_sw_if_counters); i++)
 114               {
 115                 vlib_validate_combined_counter (&im->combined_sw_if_counters
 116                                                 [i], p2pe_sw_if_index);
 117                 vlib_zero_combined_counter (&im->combined_sw_if_counters[i],
 118                                             p2pe_sw_if_index);
 119               }
 120
 121             vnet_interface_counter_unlock (im);
 122           }
 123
 124           vnet_interface_main_t *im = &vnm->interface_main;
 125           sup_and_sub_key =
 126             ((u64) (hi->sw_if_index) << 32) | (u64) p2pe_subif_id;
 127           u64 *kp = clib_mem_alloc (sizeof (*kp));
 128
 129           *kp = sup_and_sub_key;
 130           hash_set (hi->sub_interface_sw_if_index_by_id, p2pe_subif_id,
 131                     p2pe_sw_if_index);
 132           hash_set_mem (im->sw_if_index_by_sup_and_sub, kp, p2pe_sw_if_index);
 133
 134           p2p_key_t *p_p2pe_key;
 135           p_p2pe_key = clib_mem_alloc (sizeof (*p_p2pe_key));
 136           create_p2pe_key (p_p2pe_key, parent_if_index, client_mac);
 137           hash_set_mem (p2pm->p2p_ethernet_by_key, p_p2pe_key,
 138                         p2pe_sw_if_index);
 139
 140           if (p2pe_if_index)
 141             *p2pe_if_index = p2pe_sw_if_index;
 142
 143           vec_validate (p2pm->p2p_ethernet_by_sw_if_index, parent_if_index);
 144           if (p2pm->p2p_ethernet_by_sw_if_index[parent_if_index] == 0)
 145             {
 146               vnet_feature_enable_disable ("device-input",
 147                                            "p2p-ethernet-input",
 148                                            parent_if_index, 1, 0, 0);
 149               /* Set promiscuous mode on the l2 interface */
 150               ethernet_set_flags (vnm, parent_if_index,
 151                                   ETHERNET_INTERFACE_FLAG_ACCEPT_ALL);
 152
 153             }
 154           p2pm->p2p_ethernet_by_sw_if_index[parent_if_index]++;
 155           /* set the interface mode */
 156           set_int_l2_mode (vm, vnm, MODE_L3, p2pe_subif_id, 0, 0, 0, 0);
 157           return 0;
 158         }
 159       return VNET_API_ERROR_SUBIF_ALREADY_EXISTS;
 160     }
 161   else
 162     {
 163       if (p2pe_sw_if_index == ~0)
 164         return VNET_API_ERROR_SUBIF_DOESNT_EXIST;
 165       else
 166         {
 167           int rv = 0;
 168           rv = vnet_delete_sub_interface (p2pe_sw_if_index);
 169           if (!rv)
 170             {
 171               vec_validate (p2pm->p2p_ethernet_by_sw_if_index,
 172                             parent_if_index);
 173               if (p2pm->p2p_ethernet_by_sw_if_index[parent_if_index] == 1)
 174                 {
 175                   vnet_feature_enable_disable ("device-input",
 176                                                "p2p-ethernet-input",
 177                                                parent_if_index, 0, 0, 0);
 178                   /* Disable promiscuous mode on the l2 interface */
 179                   ethernet_set_flags (vnm, parent_if_index, 0);
 180                 }
 181               p2pm->p2p_ethernet_by_sw_if_index[parent_if_index]--;
 182
 183               /* Remove p2p_ethernet from hash map */
 184               p2p_key_t *p_p2pe_key;
 185               p_p2pe_key = clib_mem_alloc (sizeof (*p_p2pe_key));
 186               create_p2pe_key (p_p2pe_key, parent_if_index, client_mac);
 187               hash_unset_mem (p2pm->p2p_ethernet_by_key, p_p2pe_key);
 188             }
 189           return rv;
 190         }
 191     }
 192 }
 193
 194 static clib_error_t *
 195 vnet_p2p_ethernet_add_del (vlib_main_t * vm, unformat_input_t * input,
 196                            vlib_cli_command_t * cmd)
 197 {
 198   vnet_main_t *vnm = vnet_get_main ();
 199
 200   int is_add = 1;
 201   int remote_mac = 0;
 202   u32 hw_if_index = ~0;
 203   u32 sub_id = ~0;
 204   u8 client_mac[6];
 205
 206   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 207     {
 208       if (unformat
 209           (input, "%U", unformat_vnet_hw_interface, vnm, &hw_if_index))
 210         ;
 211       else if (unformat (input, "%U", unformat_ethernet_address, &client_mac))
 212         remote_mac = 1;
 213       else if (unformat (input, "sub-id %d", &sub_id))
 214         ;
 215       else if (unformat (input, "del"))
 216         is_add = 0;
 217       else
 218         break;
 219     }
 220
 221   if (hw_if_index == ~0)
 222     return clib_error_return (0, "Please specify parent interface ...");
 223   if (!remote_mac)
 224     return clib_error_return (0, "Please specify client MAC address ...");
 225   if (sub_id == ~0 && is_add)
 226     return clib_error_return (0, "Please specify sub-interface id ...");
 227
 228   u32 rv;
 229   rv = p2p_ethernet_add_del (vm, hw_if_index, client_mac, sub_id, is_add, 0);
 230   switch (rv)
 231     {
 232     case VNET_API_ERROR_BOND_SLAVE_NOT_ALLOWED:
 233       return clib_error_return (0,
 234                                 "not allowed as parent interface belongs to a BondEthernet interface");
 235     case -1:
 236       return clib_error_return (0,
 237                                 "p2p ethernet for given parent interface and client mac already exists");
 238     case -2:
 239       return clib_error_return (0,
 240                                 "couldn't create p2p ethernet subinterface");
 241     case -3:
 242       return clib_error_return (0,
 243                                 "p2p ethernet for given parent interface and client mac doesn't exist");
 244     default:
 245       break;
 246     }
 247   return 0;
 248 }
 249
 250 VLIB_CLI_COMMAND (p2p_ethernet_add_del_command, static) =
 251 {
 252 .path = "p2p_ethernet ",.function = vnet_p2p_ethernet_add_del,.short_help =
 253     "p2p_ethernet <intfc> <mac-address> [sub-id <id> | del]",};
 254
 255 static clib_error_t *
 256 p2p_ethernet_init (vlib_main_t * vm)
 257 {
 258   p2p_ethernet_main_t *p2pm = &p2p_main;
 259
 260   p2pm->vlib_main = vm;
 261   p2pm->vnet_main = vnet_get_main ();
 262   p2pm->p2p_ethernet_by_key =
 263     hash_create_mem (0, sizeof (p2p_key_t), sizeof (uword));
 264
 265   return 0;
 266 }
 267
 268 VLIB_INIT_FUNCTION (p2p_ethernet_init);
 269
 270 /*
 271  * fd.io coding-style-patch-verification: ON
 272  *
 273  * Local Variables:
 274  * eval: (c-set-style "gnu")
 275  * End:
 276  */