src/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 #include <vnet/fib/ip4_fib.h>
  17 #include <vnet/dpo/load_balance.h>
  18
  19 typedef struct {
  20   u32 next_index;
  21   u32 sw_if_index;
  22 } ip4_cop_whitelist_trace_t;
  23
  24 /* packet trace format function */
  25 static u8 * format_ip4_cop_whitelist_trace (u8 * s, va_list * args)
  26 {
  27   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  28   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  29   ip4_cop_whitelist_trace_t * t = va_arg (*args, ip4_cop_whitelist_trace_t *);
  30
  31   s = format (s, "IP4_COP_WHITELIST: sw_if_index %d, next index %d",
  32               t->sw_if_index, t->next_index);
  33   return s;
  34 }
  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 VLIB_NODE_FN (ip4_cop_whitelist_node) (vlib_main_t * vm,
  53                   vlib_node_runtime_t * node,
  54                   vlib_frame_t * frame)
  55 {
  56   u32 n_left_from, * from, * to_next;
  57   cop_feature_type_t next_index;
  58   cop_main_t *cm = &cop_main;
  59   vlib_combined_counter_main_t * vcm = &load_balance_main.lbm_via_counters;
  60   u32 thread_index = vm->thread_index;
  61
  62   from = vlib_frame_vector_args (frame);
  63   n_left_from = frame->n_vectors;
  64   next_index = node->cached_next_index;
  65
  66   while (n_left_from > 0)
  67     {
  68       u32 n_left_to_next;
  69
  70       vlib_get_next_frame (vm, node, next_index,
  71                            to_next, n_left_to_next);
  72
  73       while (n_left_from >= 4 && n_left_to_next >= 2)
  74         {
  75           u32 bi0, bi1;
  76           vlib_buffer_t * b0, * b1;
  77           u32 next0, next1;
  78           u32 sw_if_index0, sw_if_index1;
  79           ip4_header_t * ip0, * ip1;
  80           cop_config_main_t * ccm0, * ccm1;
  81           cop_config_data_t * c0, * c1;
  82           ip4_fib_mtrie_t * mtrie0, * mtrie1;
  83           ip4_fib_mtrie_leaf_t leaf0, leaf1;
  84           u32 lb_index0, lb_index1;
  85           const load_balance_t * lb0, *lb1;
  86           const dpo_id_t *dpo0, *dpo1;
  87
  88           /* Prefetch next iteration. */
  89           {
  90             vlib_buffer_t * p2, * p3;
  91
  92             p2 = vlib_get_buffer (vm, from[2]);
  93             p3 = vlib_get_buffer (vm, from[3]);
  94
  95             vlib_prefetch_buffer_header (p2, LOAD);
  96             vlib_prefetch_buffer_header (p3, LOAD);
  97
  98             CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
  99             CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
 100           }
 101
 102           /* speculatively enqueue b0 and b1 to the current next frame */
 103           to_next[0] = bi0 = from[0];
 104           to_next[1] = bi1 = from[1];
 105           from += 2;
 106           to_next += 2;
 107           n_left_from -= 2;
 108           n_left_to_next -= 2;
 109
 110           b0 = vlib_get_buffer (vm, bi0);
 111           sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
 112
 113           ip0 = vlib_buffer_get_current (b0);
 114
 115           ccm0 = cm->cop_config_mains + VNET_COP_IP4;
 116
 117           c0 = vnet_get_config_data
 118               (&ccm0->config_main,
 119                &vnet_buffer (b0)->cop.current_config_index,
 120                &next0,
 121                sizeof (c0[0]));
 122
 123           mtrie0 = &ip4_fib_get (c0->fib_index)->mtrie;
 124
 125           leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
 126
 127           leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0,
 128                                              &ip0->src_address, 2);
 129
 130           leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0,
 131                                              &ip0->src_address, 3);
 132
 133           lb_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
 134
 135           ASSERT (lb_index0
 136                   == ip4_fib_table_lookup_lb (ip4_fib_get(c0->fib_index),
 137                                                &ip0->src_address));
 138           lb0 = load_balance_get (lb_index0);
 139           dpo0 = load_balance_get_bucket_i(lb0, 0);
 140
 141           if (PREDICT_FALSE(dpo0->dpoi_type != DPO_RECEIVE))
 142             {
 143               b0->error = node->errors[IP4_COP_WHITELIST_ERROR_DROPPED];
 144               next0 = RX_COP_DROP;
 145             }
 146
 147           b1 = vlib_get_buffer (vm, bi1);
 148           sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
 149
 150           ip1 = vlib_buffer_get_current (b1);
 151
 152           ccm1 = cm->cop_config_mains + VNET_COP_IP4;
 153
 154           c1 = vnet_get_config_data
 155               (&ccm1->config_main,
 156                &vnet_buffer (b1)->cop.current_config_index,
 157                &next1,
 158                sizeof (c1[0]));
 159           mtrie1 = &ip4_fib_get (c1->fib_index)->mtrie;
 160
 161           leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, &ip1->src_address);
 162
 163           leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1,
 164                                              &ip1->src_address, 2);
 165
 166           leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1,
 167                                              &ip1->src_address, 3);
 168
 169           lb_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
 170           ASSERT (lb_index1
 171                   == ip4_fib_table_lookup_lb (ip4_fib_get(c1->fib_index),
 172                                                &ip1->src_address));
 173           lb1 = load_balance_get (lb_index1);
 174           dpo1 = load_balance_get_bucket_i(lb1, 0);
 175
 176           vlib_increment_combined_counter
 177               (vcm, thread_index, lb_index0, 1,
 178                vlib_buffer_length_in_chain (vm, b0)
 179                + sizeof(ethernet_header_t));
 180
 181           vlib_increment_combined_counter
 182               (vcm, thread_index, lb_index1, 1,
 183                vlib_buffer_length_in_chain (vm, b1)
 184                + sizeof(ethernet_header_t));
 185
 186
 187           if (PREDICT_FALSE(dpo1->dpoi_type != DPO_RECEIVE))
 188             {
 189               b1->error = node->errors[IP4_COP_WHITELIST_ERROR_DROPPED];
 190               next1 = RX_COP_DROP;
 191             }
 192
 193           if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
 194                             && (b0->flags & VLIB_BUFFER_IS_TRACED)))
 195             {
 196               ip4_cop_whitelist_trace_t *t =
 197                  vlib_add_trace (vm, node, b0, sizeof (*t));
 198               t->sw_if_index = sw_if_index0;
 199               t->next_index = next0;
 200             }
 201
 202           if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
 203                             && (b1->flags & VLIB_BUFFER_IS_TRACED)))
 204             {
 205               ip4_cop_whitelist_trace_t *t =
 206                  vlib_add_trace (vm, node, b1, sizeof (*t));
 207               t->sw_if_index = sw_if_index1;
 208               t->next_index = next1;
 209             }
 210
 211           /* verify speculative enqueues, maybe switch current next frame */
 212           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
 213                                            to_next, n_left_to_next,
 214                                            bi0, bi1, next0, next1);
 215         }
 216
 217       while (n_left_from > 0 && n_left_to_next > 0)
 218         {
 219           u32 bi0;
 220           vlib_buffer_t * b0;
 221           u32 next0;
 222           u32 sw_if_index0;
 223           ip4_header_t * ip0;
 224           cop_config_main_t *ccm0;
 225           cop_config_data_t *c0;
 226           ip4_fib_mtrie_t * mtrie0;
 227           ip4_fib_mtrie_leaf_t leaf0;
 228           u32 lb_index0;
 229           const load_balance_t * lb0;
 230           const dpo_id_t *dpo0;
 231
 232           /* speculatively enqueue b0 to the current next frame */
 233           bi0 = from[0];
 234           to_next[0] = bi0;
 235           from += 1;
 236           to_next += 1;
 237           n_left_from -= 1;
 238           n_left_to_next -= 1;
 239
 240           b0 = vlib_get_buffer (vm, bi0);
 241           sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
 242
 243           ip0 = vlib_buffer_get_current (b0);
 244
 245           ccm0 = cm->cop_config_mains + VNET_COP_IP4;
 246
 247           c0 = vnet_get_config_data
 248               (&ccm0->config_main,
 249                &vnet_buffer (b0)->cop.current_config_index,
 250                &next0,
 251                sizeof (c0[0]));
 252
 253           mtrie0 = &ip4_fib_get (c0->fib_index)->mtrie;
 254
 255           leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
 256
 257           leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0,
 258                                              &ip0->src_address, 2);
 259
 260           leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0,
 261                                              &ip0->src_address, 3);
 262
 263           lb_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
 264
 265           ASSERT (lb_index0
 266                   == ip4_fib_table_lookup_lb (ip4_fib_get(c0->fib_index),
 267                                               &ip0->src_address));
 268
 269           lb0 = load_balance_get (lb_index0);
 270           dpo0 = load_balance_get_bucket_i(lb0, 0);
 271
 272           vlib_increment_combined_counter
 273               (vcm, thread_index, lb_index0, 1,
 274                vlib_buffer_length_in_chain (vm, b0)
 275                + sizeof(ethernet_header_t));
 276
 277           if (PREDICT_FALSE(dpo0->dpoi_type != DPO_RECEIVE))
 278             {
 279               b0->error = node->errors[IP4_COP_WHITELIST_ERROR_DROPPED];
 280               next0 = RX_COP_DROP;
 281             }
 282
 283           if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
 284                             && (b0->flags & VLIB_BUFFER_IS_TRACED)))
 285             {
 286               ip4_cop_whitelist_trace_t *t =
 287                  vlib_add_trace (vm, node, b0, sizeof (*t));
 288               t->sw_if_index = sw_if_index0;
 289               t->next_index = next0;
 290             }
 291
 292           /* verify speculative enqueue, maybe switch current next frame */
 293           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 294                                            to_next, n_left_to_next,
 295                                            bi0, next0);
 296         }
 297
 298       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 299     }
 300   return frame->n_vectors;
 301 }
 302
 303 VLIB_REGISTER_NODE (ip4_cop_whitelist_node) = {
 304   .name = "ip4-cop-whitelist",
 305   .vector_size = sizeof (u32),
 306   .format_trace = format_ip4_cop_whitelist_trace,
 307   .type = VLIB_NODE_TYPE_INTERNAL,
 308
 309   .n_errors = ARRAY_LEN(ip4_cop_whitelist_error_strings),
 310   .error_strings = ip4_cop_whitelist_error_strings,
 311
 312   .n_next_nodes = COP_RX_N_FEATURES,
 313
 314   /* edit / add dispositions here */
 315   .next_nodes = {
 316     [IP4_RX_COP_WHITELIST] = "ip4-cop-whitelist",
 317     [IP6_RX_COP_WHITELIST] = "ip6-cop-whitelist",
 318     [DEFAULT_RX_COP_WHITELIST] = "default-cop-whitelist",
 319     [IP4_RX_COP_INPUT] = "ip4-input",
 320     [IP6_RX_COP_INPUT] = "ip6-input",
 321     [DEFAULT_RX_COP_INPUT] = "ethernet-input",
 322     [RX_COP_DROP] = "error-drop",
 323   },
 324 };
 325
 326 static clib_error_t *
 327 ip4_whitelist_init (vlib_main_t * vm)
 328 {
 329   return 0;
 330 }
 331
 332 VLIB_INIT_FUNCTION (ip4_whitelist_init);