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           vnet_interface_main_t *im = &vnm->interface_main;
 100           sup_and_sub_key =
 101             ((u64) (hi->sw_if_index) << 32) | (u64) p2pe_subif_id;
 102           u64 *kp = clib_mem_alloc (sizeof (*kp));
 103
 104           *kp = sup_and_sub_key;
 105           hash_set (hi->sub_interface_sw_if_index_by_id, p2pe_subif_id,
 106                     p2pe_sw_if_index);
 107           hash_set_mem (im->sw_if_index_by_sup_and_sub, kp, p2pe_sw_if_index);
 108
 109           p2p_key_t *p_p2pe_key;
 110           p_p2pe_key = clib_mem_alloc (sizeof (*p_p2pe_key));
 111           create_p2pe_key (p_p2pe_key, parent_if_index, client_mac);
 112           hash_set_mem (p2pm->p2p_ethernet_by_key, p_p2pe_key,
 113                         p2pe_sw_if_index);
 114
 115           if (p2pe_if_index)
 116             *p2pe_if_index = p2pe_sw_if_index;
 117
 118           vec_validate (p2pm->p2p_ethernet_by_sw_if_index, parent_if_index);
 119           if (p2pm->p2p_ethernet_by_sw_if_index[parent_if_index] == 0)
 120             {
 121               vnet_feature_enable_disable ("device-input",
 122                                            "p2p-ethernet-input",
 123                                            parent_if_index, 1, 0, 0);
 124               /* Set promiscuous mode on the l2 interface */
 125               ethernet_set_flags (vnm, parent_if_index,
 126                                   ETHERNET_INTERFACE_FLAG_ACCEPT_ALL);
 127
 128             }
 129           p2pm->p2p_ethernet_by_sw_if_index[parent_if_index]++;
 130           /* set the interface mode */
 131           set_int_l2_mode (vm, vnm, MODE_L3, p2pe_subif_id, 0, 0, 0, 0);
 132           return 0;
 133         }
 134       return VNET_API_ERROR_SUBIF_ALREADY_EXISTS;
 135     }
 136   else
 137     {
 138       if (p2pe_sw_if_index == ~0)
 139         return VNET_API_ERROR_SUBIF_DOESNT_EXIST;
 140       else
 141         {
 142           int rv = 0;
 143           rv = vnet_delete_sub_interface (p2pe_sw_if_index);
 144           if (!rv)
 145             {
 146               vec_validate (p2pm->p2p_ethernet_by_sw_if_index,
 147                             parent_if_index);
 148               if (p2pm->p2p_ethernet_by_sw_if_index[parent_if_index] == 1)
 149                 {
 150                   vnet_feature_enable_disable ("device-input",
 151                                                "p2p-ethernet-input",
 152                                                parent_if_index, 0, 0, 0);
 153                   /* Disable promiscuous mode on the l2 interface */
 154                   ethernet_set_flags (vnm, parent_if_index, 0);
 155                 }
 156               p2pm->p2p_ethernet_by_sw_if_index[parent_if_index]--;
 157
 158               /* Remove p2p_ethernet from hash map */
 159               p2p_key_t *p_p2pe_key;
 160               p_p2pe_key = clib_mem_alloc (sizeof (*p_p2pe_key));
 161               create_p2pe_key (p_p2pe_key, parent_if_index, client_mac);
 162               hash_unset_mem (p2pm->p2p_ethernet_by_key, p_p2pe_key);
 163             }
 164           return rv;
 165         }
 166     }
 167 }
 168
 169 static clib_error_t *
 170 vnet_p2p_ethernet_add_del (vlib_main_t * vm, unformat_input_t * input,
 171                            vlib_cli_command_t * cmd)
 172 {
 173   vnet_main_t *vnm = vnet_get_main ();
 174
 175   int is_add = 1;
 176   int remote_mac = 0;
 177   u32 hw_if_index = ~0;
 178   u32 sub_id = ~0;
 179   u8 client_mac[6];
 180
 181   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 182     {
 183       if (unformat
 184           (input, "%U", unformat_vnet_hw_interface, vnm, &hw_if_index))
 185         ;
 186       else if (unformat (input, "%U", unformat_ethernet_address, &client_mac))
 187         remote_mac = 1;
 188       else if (unformat (input, "sub-id %d", &sub_id))
 189         ;
 190       else if (unformat (input, "del"))
 191         is_add = 0;
 192       else
 193         break;
 194     }
 195
 196   if (hw_if_index == ~0)
 197     return clib_error_return (0, "Please specify parent interface ...");
 198   if (!remote_mac)
 199     return clib_error_return (0, "Please specify client MAC address ...");
 200   if (sub_id == ~0 && is_add)
 201     return clib_error_return (0, "Please specify sub-interface id ...");
 202
 203   u32 rv;
 204   rv = p2p_ethernet_add_del (vm, hw_if_index, client_mac, sub_id, is_add, 0);
 205   switch (rv)
 206     {
 207     case VNET_API_ERROR_BOND_SLAVE_NOT_ALLOWED:
 208       return clib_error_return (0,
 209                                 "not allowed as parent interface belongs to a BondEthernet interface");
 210     case -1:
 211       return clib_error_return (0,
 212                                 "p2p ethernet for given parent interface and client mac already exists");
 213     case -2:
 214       return clib_error_return (0,
 215                                 "couldn't create p2p ethernet subinterface");
 216     case -3:
 217       return clib_error_return (0,
 218                                 "p2p ethernet for given parent interface and client mac doesn't exist");
 219     default:
 220       break;
 221     }
 222   return 0;
 223 }
 224
 225 VLIB_CLI_COMMAND (p2p_ethernet_add_del_command, static) =
 226 {
 227 .path = "p2p_ethernet ",.function = vnet_p2p_ethernet_add_del,.short_help =
 228     "p2p_ethernet <intfc> <mac-address> [sub-id <id> | del]",};
 229
 230 static clib_error_t *
 231 p2p_ethernet_init (vlib_main_t * vm)
 232 {
 233   p2p_ethernet_main_t *p2pm = &p2p_main;
 234
 235   p2pm->vlib_main = vm;
 236   p2pm->vnet_main = vnet_get_main ();
 237   p2pm->p2p_ethernet_by_key =
 238     hash_create_mem (0, sizeof (p2p_key_t), sizeof (uword));
 239
 240   return 0;
 241 }
 242
 243 VLIB_INIT_FUNCTION (p2p_ethernet_init);
 244
 245 /*
 246  * fd.io coding-style-patch-verification: ON
 247  *
 248  * Local Variables:
 249  * eval: (c-set-style "gnu")
 250  * End:
 251  */