vnet/vnet/cop/ip4_whitelist.c

   1 /*
   2  * Copyright (c) 2016 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 #include <vnet/cop/cop.h>
  16
  17 typedef struct {
  18   u32 next_index;
  19   u32 sw_if_index;
  20 } ip4_cop_whitelist_trace_t;
  21
  22 /* packet trace format function */
  23 static u8 * format_ip4_cop_whitelist_trace (u8 * s, va_list * args)
  24 {
  25   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  26   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  27   ip4_cop_whitelist_trace_t * t = va_arg (*args, ip4_cop_whitelist_trace_t *);
  28
  29   s = format (s, "IP4_COP_WHITELIST: sw_if_index %d, next index %d",
  30               t->sw_if_index, t->next_index);
  31   return s;
  32 }
  33
  34 vlib_node_registration_t ip4_cop_whitelist_node;
  35
  36 #define foreach_ip4_cop_whitelist_error                         \
  37 _(DROPPED, "ip4 cop whitelist packets dropped")
  38
  39 typedef enum {
  40 #define _(sym,str) IP4_COP_WHITELIST_ERROR_##sym,
  41   foreach_ip4_cop_whitelist_error
  42 #undef _
  43   IP4_COP_WHITELIST_N_ERROR,
  44 } ip4_cop_whitelist_error_t;
  45
  46 static char * ip4_cop_whitelist_error_strings[] = {
  47 #define _(sym,string) string,
  48   foreach_ip4_cop_whitelist_error
  49 #undef _
  50 };
  51
  52 static uword
  53 ip4_cop_whitelist_node_fn (vlib_main_t * vm,
  54                   vlib_node_runtime_t * node,
  55                   vlib_frame_t * frame)
  56 {
  57   u32 n_left_from, * from, * to_next;
  58   cop_feature_type_t next_index;
  59   cop_main_t *cm = &cop_main;
  60   ip4_main_t * im4 = &ip4_main;
  61   ip_lookup_main_t * lm4 = &im4->lookup_main;
  62   vlib_combined_counter_main_t * vcm = &im4->lookup_main.adjacency_counters;
  63   u32 cpu_index = vm->cpu_index;
  64
  65   from = vlib_frame_vector_args (frame);
  66   n_left_from = frame->n_vectors;
  67   next_index = node->cached_next_index;
  68
  69   while (n_left_from > 0)
  70     {
  71       u32 n_left_to_next;
  72
  73       vlib_get_next_frame (vm, node, next_index,
  74                            to_next, n_left_to_next);
  75
  76       while (n_left_from >= 4 && n_left_to_next >= 2)
  77         {
  78           u32 bi0, bi1;
  79           vlib_buffer_t * b0, * b1;
  80           u32 next0, next1;
  81           u32 sw_if_index0, sw_if_index1;
  82           ip4_header_t * ip0, * ip1;
  83           cop_config_main_t * ccm0, * ccm1;
  84           cop_config_data_t * c0, * c1;
  85           ip4_fib_mtrie_t * mtrie0, * mtrie1;
  86           ip4_fib_mtrie_leaf_t leaf0, leaf1;
  87           u32 adj_index0, adj_index1;
  88           ip_adjacency_t * adj0, * adj1;
  89
  90           /* Prefetch next iteration. */
  91           {
  92             vlib_buffer_t * p2, * p3;
  93
  94             p2 = vlib_get_buffer (vm, from[2]);
  95             p3 = vlib_get_buffer (vm, from[3]);
  96
  97             vlib_prefetch_buffer_header (p2, LOAD);
  98             vlib_prefetch_buffer_header (p3, LOAD);
  99
 100             CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
 101             CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
 102           }
 103
 104           /* speculatively enqueue b0 and b1 to the current next frame */
 105           to_next[0] = bi0 = from[0];
 106           to_next[1] = bi1 = from[1];
 107           from += 2;
 108           to_next += 2;
 109           n_left_from -= 2;
 110           n_left_to_next -= 2;
 111
 112           b0 = vlib_get_buffer (vm, bi0);
 113           sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
 114
 115           ip0 = vlib_buffer_get_current (b0);
 116
 117           ccm0 = cm->cop_config_mains + VNET_COP_IP4;
 118
 119           c0 = vnet_get_config_data
 120               (&ccm0->config_main,
 121                &vnet_buffer (b0)->cop.current_config_index,
 122                &next0,
 123                sizeof (c0[0]));
 124
 125           mtrie0 = &vec_elt_at_index (im4->fibs, c0->fib_index)->mtrie;
 126
 127           leaf0 = IP4_FIB_MTRIE_LEAF_ROOT;
 128
 129           leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0,
 130                                              &ip0->src_address, 0);
 131
 132           leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0,
 133                                              &ip0->src_address, 1);
 134
 135           leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0,
 136                                              &ip0->src_address, 2);
 137
 138           leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0,
 139                                              &ip0->src_address, 3);
 140
 141           adj_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
 142
 143           ASSERT (adj_index0
 144                   == ip4_fib_lookup_with_table (im4, c0->fib_index,
 145                                                 &ip0->src_address,
 146                                                 1 /* no_default_route */));
 147           adj0 = ip_get_adjacency (lm4, adj_index0);
 148           if (PREDICT_FALSE(adj0->lookup_next_index != IP_LOOKUP_NEXT_LOCAL))
 149             {
 150               b0->error = node->errors[IP4_COP_WHITELIST_ERROR_DROPPED];
 151               next0 = RX_COP_DROP;
 152             }
 153
 154           b1 = vlib_get_buffer (vm, bi1);
 155           sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
 156
 157           ip1 = vlib_buffer_get_current (b1);
 158
 159           ccm1 = cm->cop_config_mains + VNET_COP_IP4;
 160
 161           c1 = vnet_get_config_data
 162               (&ccm1->config_main,
 163                &vnet_buffer (b1)->cop.current_config_index,
 164                &next1,
 165                sizeof (c1[0]));
 166
 167           mtrie1 = &vec_elt_at_index (im4->fibs, c1->fib_index)->mtrie;
 168
 169           leaf1 = IP4_FIB_MTRIE_LEAF_ROOT;
 170
 171           leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1,
 172                                              &ip1->src_address, 0);
 173
 174           leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1,
 175                                              &ip1->src_address, 1);
 176
 177           leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1,
 178                                              &ip1->src_address, 2);
 179
 180           leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1,
 181                                              &ip1->src_address, 3);
 182
 183           adj_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
 184
 185           ASSERT (adj_index1
 186                   == ip4_fib_lookup_with_table (im4, c1->fib_index,
 187                                                 &ip1->src_address,
 188                                                 1 /* no_default_route */));
 189           adj1 = ip_get_adjacency (lm4, adj_index1);
 190
 191           vlib_increment_combined_counter
 192               (vcm, cpu_index, adj_index0, 1,
 193                vlib_buffer_length_in_chain (vm, b0)
 194                + sizeof(ethernet_header_t));
 195
 196           vlib_increment_combined_counter
 197               (vcm, cpu_index, adj_index1, 1,
 198                vlib_buffer_length_in_chain (vm, b1)
 199                + sizeof(ethernet_header_t));
 200
 201           if (PREDICT_FALSE(adj0->lookup_next_index != IP_LOOKUP_NEXT_LOCAL))
 202             {
 203               b0->error = node->errors[IP4_COP_WHITELIST_ERROR_DROPPED];
 204               next0 = RX_COP_DROP;
 205             }
 206
 207           if (PREDICT_FALSE(adj1->lookup_next_index != IP_LOOKUP_NEXT_LOCAL))
 208             {
 209               b1->error = node->errors[IP4_COP_WHITELIST_ERROR_DROPPED];
 210               next1 = RX_COP_DROP;
 211             }
 212
 213           if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
 214                             && (b0->flags & VLIB_BUFFER_IS_TRACED)))
 215             {
 216               ip4_cop_whitelist_trace_t *t =
 217                  vlib_add_trace (vm, node, b0, sizeof (*t));
 218               t->sw_if_index = sw_if_index0;
 219               t->next_index = next0;
 220             }
 221
 222           if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
 223                             && (b1->flags & VLIB_BUFFER_IS_TRACED)))
 224             {
 225               ip4_cop_whitelist_trace_t *t =
 226                  vlib_add_trace (vm, node, b1, sizeof (*t));
 227               t->sw_if_index = sw_if_index1;
 228               t->next_index = next1;
 229             }
 230
 231           /* verify speculative enqueues, maybe switch current next frame */
 232           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
 233                                            to_next, n_left_to_next,
 234                                            bi0, bi1, next0, next1);
 235         }
 236
 237       while (n_left_from > 0 && n_left_to_next > 0)
 238         {
 239           u32 bi0;
 240           vlib_buffer_t * b0;
 241           u32 next0;
 242           u32 sw_if_index0;
 243           ip4_header_t * ip0;
 244           cop_config_main_t *ccm0;
 245           cop_config_data_t *c0;
 246           ip4_fib_mtrie_t * mtrie0;
 247           ip4_fib_mtrie_leaf_t leaf0;
 248           u32 adj_index0;
 249           ip_adjacency_t * adj0;
 250
 251           /* speculatively enqueue b0 to the current next frame */
 252           bi0 = from[0];
 253           to_next[0] = bi0;
 254           from += 1;
 255           to_next += 1;
 256           n_left_from -= 1;
 257           n_left_to_next -= 1;
 258
 259           b0 = vlib_get_buffer (vm, bi0);
 260           sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
 261
 262           ip0 = vlib_buffer_get_current (b0);
 263
 264           ccm0 = cm->cop_config_mains + VNET_COP_IP4;
 265
 266           c0 = vnet_get_config_data
 267               (&ccm0->config_main,
 268                &vnet_buffer (b0)->cop.current_config_index,
 269                &next0,
 270                sizeof (c0[0]));
 271
 272           mtrie0 = &vec_elt_at_index (im4->fibs, c0->fib_index)->mtrie;
 273
 274           leaf0 = IP4_FIB_MTRIE_LEAF_ROOT;
 275
 276           leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0,
 277                                              &ip0->src_address, 0);
 278
 279           leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0,
 280                                              &ip0->src_address, 1);
 281
 282           leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0,
 283                                              &ip0->src_address, 2);
 284
 285           leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0,
 286                                              &ip0->src_address, 3);
 287
 288           adj_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
 289
 290           ASSERT (adj_index0
 291                   == ip4_fib_lookup_with_table (im4, c0->fib_index,
 292                                                 &ip0->src_address,
 293                                                 1 /* no_default_route */));
 294           adj0 = ip_get_adjacency (lm4, adj_index0);
 295
 296           vlib_increment_combined_counter
 297               (vcm, cpu_index, adj_index0, 1,
 298                vlib_buffer_length_in_chain (vm, b0)
 299                + sizeof(ethernet_header_t));
 300
 301           if (PREDICT_FALSE(adj0->lookup_next_index != IP_LOOKUP_NEXT_LOCAL))
 302             {
 303               b0->error = node->errors[IP4_COP_WHITELIST_ERROR_DROPPED];
 304               next0 = RX_COP_DROP;
 305             }
 306
 307           if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
 308                             && (b0->flags & VLIB_BUFFER_IS_TRACED)))
 309             {
 310               ip4_cop_whitelist_trace_t *t =
 311                  vlib_add_trace (vm, node, b0, sizeof (*t));
 312               t->sw_if_index = sw_if_index0;
 313               t->next_index = next0;
 314             }
 315
 316           /* verify speculative enqueue, maybe switch current next frame */
 317           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 318                                            to_next, n_left_to_next,
 319                                            bi0, next0);
 320         }
 321
 322       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 323     }
 324   return frame->n_vectors;
 325 }
 326
 327 VLIB_REGISTER_NODE (ip4_cop_whitelist_node) = {
 328   .function = ip4_cop_whitelist_node_fn,
 329   .name = "ip4-cop-whitelist",
 330   .vector_size = sizeof (u32),
 331   .format_trace = format_ip4_cop_whitelist_trace,
 332   .type = VLIB_NODE_TYPE_INTERNAL,
 333
 334   .n_errors = ARRAY_LEN(ip4_cop_whitelist_error_strings),
 335   .error_strings = ip4_cop_whitelist_error_strings,
 336
 337   .n_next_nodes = COP_RX_N_FEATURES,
 338
 339   /* edit / add dispositions here */
 340   .next_nodes = {
 341     [IP4_RX_COP_WHITELIST] = "ip4-cop-whitelist",
 342     [IP6_RX_COP_WHITELIST] = "ip6-cop-whitelist",
 343     [DEFAULT_RX_COP_WHITELIST] = "default-cop-whitelist",
 344     [IP4_RX_COP_INPUT] = "ip4-input",
 345     [IP6_RX_COP_INPUT] = "ip6-input",
 346     [DEFAULT_RX_COP_INPUT] = "ethernet-input",
 347     [RX_COP_DROP] = "error-drop",
 348   },
 349 };
 350
 351 VLIB_NODE_FUNCTION_MULTIARCH (ip4_cop_whitelist_node, ip4_cop_whitelist_node_fn)
 352
 353 static clib_error_t *
 354 ip4_whitelist_init (vlib_main_t * vm)
 355 {
 356   return 0;
 357 }
 358
 359 VLIB_INIT_FUNCTION (ip4_whitelist_init);