src/vnet/ip/ip_interface.c

   1 /*
   2  * Copyright (c) 2020 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 #include <vnet/ip/ip.h>
  17
  18 /**
  19  * @file
  20  * @brief IP prefix management on interfaces
  21  */
  22
  23 u32
  24 ip_interface_address_find (ip_lookup_main_t * lm,
  25                            void *addr_fib, u32 address_length)
  26 {
  27   uword *p = mhash_get (&lm->address_to_if_address_index, addr_fib);
  28
  29   if (p)
  30     return (p[0]);
  31
  32   return (~0);
  33 }
  34
  35 clib_error_t *
  36 ip_interface_address_add (ip_lookup_main_t * lm,
  37                           u32 sw_if_index,
  38                           void *addr_fib,
  39                           u32 address_length, u32 * result_if_address_index)
  40 {
  41   vnet_main_t *vnm = vnet_get_main ();
  42   ip_interface_address_t *a, *prev;
  43   u32 pi;                       /* previous index */
  44   u32 ai;
  45   u32 hi;                       /* head index */
  46
  47   /* Verify given length. */
  48   if ((address_length == 0) ||
  49       (lm->is_ip6 && address_length > 128) ||
  50       (!lm->is_ip6 && address_length > 32))
  51     {
  52       vnm->api_errno = VNET_API_ERROR_ADDRESS_LENGTH_MISMATCH;
  53       return clib_error_create
  54         ("%U wrong length for interface %U",
  55          lm->format_address_and_length, addr_fib,
  56          address_length, format_vnet_sw_if_index_name, vnm, sw_if_index);
  57     }
  58
  59   vec_validate_init_empty (lm->if_address_pool_index_by_sw_if_index,
  60                            sw_if_index, ~0);
  61
  62   pool_get_zero (lm->if_address_pool, a);
  63
  64   ai = a - lm->if_address_pool;
  65   hi = pi = lm->if_address_pool_index_by_sw_if_index[sw_if_index];
  66
  67   prev = 0;
  68   while (pi != (u32) ~ 0)
  69     {
  70       prev = pool_elt_at_index (lm->if_address_pool, pi);
  71       pi = prev->next_this_sw_interface;
  72     }
  73   pi = prev ? prev - lm->if_address_pool : (u32) ~ 0;
  74
  75   a->address_key = mhash_set (&lm->address_to_if_address_index,
  76                               addr_fib, ai, /* old_value */ 0);
  77   a->address_length = address_length;
  78   a->sw_if_index = sw_if_index;
  79   a->flags = 0;
  80   a->prev_this_sw_interface = pi;
  81   a->next_this_sw_interface = ~0;
  82   if (prev)
  83     prev->next_this_sw_interface = ai;
  84
  85   lm->if_address_pool_index_by_sw_if_index[sw_if_index] =
  86     (hi != ~0) ? hi : ai;
  87
  88   *result_if_address_index = ai;
  89
  90   return (NULL);
  91 }
  92
  93 void
  94 ip_interface_address_del (ip_lookup_main_t * lm,
  95                           u32 address_index, void *addr_fib)
  96 {
  97   ip_interface_address_t *a, *prev, *next;
  98
  99   a = pool_elt_at_index (lm->if_address_pool, address_index);
 100
 101   if (a->prev_this_sw_interface != ~0)
 102     {
 103       prev = pool_elt_at_index (lm->if_address_pool,
 104                                 a->prev_this_sw_interface);
 105       prev->next_this_sw_interface = a->next_this_sw_interface;
 106     }
 107   if (a->next_this_sw_interface != ~0)
 108     {
 109       next = pool_elt_at_index (lm->if_address_pool,
 110                                 a->next_this_sw_interface);
 111       next->prev_this_sw_interface = a->prev_this_sw_interface;
 112
 113       if (a->prev_this_sw_interface == ~0)
 114         lm->if_address_pool_index_by_sw_if_index[a->sw_if_index] =
 115           a->next_this_sw_interface;
 116     }
 117
 118   if ((a->next_this_sw_interface == ~0) && (a->prev_this_sw_interface == ~0))
 119     lm->if_address_pool_index_by_sw_if_index[a->sw_if_index] = ~0;
 120
 121   mhash_unset (&lm->address_to_if_address_index, addr_fib,
 122                /* old_value */ 0);
 123   pool_put (lm->if_address_pool, a);
 124 }
 125
 126 u8
 127 ip_interface_has_address (u32 sw_if_index, ip46_address_t * ip, u8 is_ip4)
 128 {
 129   ip_interface_address_t *ia = 0;
 130
 131   if (is_ip4)
 132     {
 133       ip_lookup_main_t *lm4 = &ip4_main.lookup_main;
 134       ip4_address_t *ip4;
 135       /* *INDENT-OFF* */
 136       foreach_ip_interface_address (lm4, ia, sw_if_index, 1 /* unnumbered */ ,
 137       ({
 138         ip4 = ip_interface_address_get_address (lm4, ia);
 139         if (ip4_address_compare (ip4, &ip->ip4) == 0)
 140           return 1;
 141       }));
 142       /* *INDENT-ON* */
 143     }
 144   else
 145     {
 146       ip_lookup_main_t *lm6 = &ip6_main.lookup_main;
 147       ip6_address_t *ip6;
 148       /* *INDENT-OFF* */
 149       foreach_ip_interface_address (lm6, ia, sw_if_index, 1 /* unnumbered */ ,
 150       ({
 151         ip6 = ip_interface_address_get_address (lm6, ia);
 152         if (ip6_address_compare (ip6, &ip->ip6) == 0)
 153           return 1;
 154       }));
 155       /* *INDENT-ON* */
 156     }
 157   return 0;
 158 }
 159
 160 void *
 161 ip_interface_get_first_ip (u32 sw_if_index, u8 is_ip4)
 162 {
 163   ip_lookup_main_t *lm4 = &ip4_main.lookup_main;
 164   ip_lookup_main_t *lm6 = &ip6_main.lookup_main;
 165   ip_interface_address_t *ia = 0;
 166
 167   if (is_ip4)
 168     {
 169       /* *INDENT-OFF* */
 170       foreach_ip_interface_address (lm4, ia, sw_if_index, 1 /* unnumbered */ ,
 171       ({
 172         return ip_interface_address_get_address (lm4, ia);
 173       }));
 174       /* *INDENT-ON* */
 175     }
 176   else
 177     {
 178       /* *INDENT-OFF* */
 179       foreach_ip_interface_address (lm6, ia, sw_if_index, 1 /* unnumbered */ ,
 180       ({
 181         ip6_address_t *rv;
 182         rv = ip_interface_address_get_address (lm6, ia);
 183         /* Trying to use a link-local ip6 src address is a fool's errand */
 184         if (!ip6_address_is_link_local_unicast (rv))
 185           return rv;
 186       }));
 187       /* *INDENT-ON* */
 188     }
 189
 190   return 0;
 191 }
 192
 193 static walk_rc_t
 194 ip_interface_address_mark_one_interface (vnet_main_t * vnm,
 195                                          vnet_sw_interface_t * si, void *ctx)
 196 {
 197   ip_lookup_main_t *lm4 = &ip4_main.lookup_main;
 198   ip_lookup_main_t *lm6 = &ip6_main.lookup_main;
 199   ip_interface_address_t *ia = 0;
 200
 201   /* *INDENT-OFF* */
 202   foreach_ip_interface_address (lm4, ia, si->sw_if_index, 1 /* unnumbered */ ,
 203   ({
 204     ia->flags |= IP_INTERFACE_ADDRESS_FLAG_STALE;
 205   }));
 206   foreach_ip_interface_address (lm6, ia, si->sw_if_index, 1 /* unnumbered */ ,
 207   ({
 208     ia->flags |= IP_INTERFACE_ADDRESS_FLAG_STALE;
 209   }));
 210   /* *INDENT-ON* */
 211
 212   return (WALK_CONTINUE);
 213 }
 214
 215 void
 216 ip_interface_address_mark (void)
 217 {
 218   vnet_sw_interface_walk (vnet_get_main (),
 219                           ip_interface_address_mark_one_interface, NULL);
 220 }
 221
 222 static walk_rc_t
 223 ip_interface_address_sweep_one_interface (vnet_main_t * vnm,
 224                                           vnet_sw_interface_t * si, void *ctx)
 225 {
 226   vlib_main_t *vm = vlib_get_main ();
 227   ip4_address_t *ip4_addrs = 0;
 228   ip6_address_t *ip6_addrs = 0;
 229   ip4_main_t *im4 = &ip4_main;
 230   ip6_main_t *im6 = &ip6_main;
 231   ip_interface_address_t *ia;
 232   u32 *ip6_masks = 0;
 233   u32 *ip4_masks = 0;
 234   int i;
 235
 236   /* *INDENT-OFF* */
 237   foreach_ip_interface_address (&im4->lookup_main, ia, si->sw_if_index, 1,
 238   ({
 239     if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
 240       {
 241         ip4_address_t * x = (ip4_address_t *)
 242           ip_interface_address_get_address (&im4->lookup_main, ia);
 243         vec_add1 (ip4_addrs, x[0]);
 244         vec_add1 (ip4_masks, ia->address_length);
 245       }
 246   }));
 247
 248   foreach_ip_interface_address (&im6->lookup_main, ia, si->sw_if_index, 1,
 249   ({
 250     if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
 251       {
 252         ip6_address_t * x = (ip6_address_t *)
 253           ip_interface_address_get_address (&im6->lookup_main, ia);
 254         vec_add1 (ip6_addrs, x[0]);
 255         vec_add1 (ip6_masks, ia->address_length);
 256       }
 257   }));
 258   /* *INDENT-ON* */
 259
 260   for (i = 0; i < vec_len (ip4_addrs); i++)
 261     ip4_add_del_interface_address (vm, si->sw_if_index, &ip4_addrs[i],
 262                                    ip4_masks[i], 1 /* is_del */ );
 263   for (i = 0; i < vec_len (ip6_addrs); i++)
 264     ip6_add_del_interface_address (vm, si->sw_if_index, &ip6_addrs[i],
 265                                    ip6_masks[i], 1 /* is_del */ );
 266
 267   vec_free (ip4_addrs);
 268   vec_free (ip4_masks);
 269   vec_free (ip6_addrs);
 270   vec_free (ip6_masks);
 271
 272   return (WALK_CONTINUE);
 273 }
 274
 275 void
 276 ip_interface_address_sweep (void)
 277 {
 278   vnet_sw_interface_walk (vnet_get_main (),
 279                           ip_interface_address_sweep_one_interface, NULL);
 280 }
 281
 282 /*
 283  * fd.io coding-style-patch-verification: ON
 284  *
 285  * Local Variables:
 286  * eval: (c-set-style "gnu")
 287  * End:
 288  */