src/plugins/adl/ip6_allowlist.c

   1 /*
   2  * Copyright (c) 2016,2020 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 #include <plugins/adl/adl.h>
  16 #include <vnet/fib/ip6_fib.h>
  17 #include <vnet/dpo/load_balance.h>
  18
  19 typedef struct {
  20   u32 next_index;
  21   u32 sw_if_index;
  22 } ip6_adl_allowlist_trace_t;
  23
  24 /* packet trace format function */
  25 static u8 * format_ip6_adl_allowlist_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   ip6_adl_allowlist_trace_t * t = va_arg (*args, ip6_adl_allowlist_trace_t *);
  30
  31   s = format (s, "IP6_ADL_ALLOWLIST: sw_if_index %d, next index %d",
  32               t->sw_if_index, t->next_index);
  33   return s;
  34 }
  35
  36 #define foreach_ip6_adl_allowlist_error         \
  37 _(ALLOWED, "ip6 allowlist allowed")             \
  38 _(DROPPED, "ip6 allowlist dropped")
  39
  40 typedef enum {
  41 #define _(sym,str) IP6_ADL_ALLOWLIST_ERROR_##sym,
  42   foreach_ip6_adl_allowlist_error
  43 #undef _
  44   IP6_ADL_ALLOWLIST_N_ERROR,
  45 } ip6_adl_allowlist_error_t;
  46
  47 static char * ip6_adl_allowlist_error_strings[] = {
  48 #define _(sym,string) string,
  49   foreach_ip6_adl_allowlist_error
  50 #undef _
  51 };
  52
  53 VLIB_NODE_FN (ip6_adl_allowlist_node) (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   adl_feature_type_t next_index;
  59   adl_main_t *cm = &adl_main;
  60   vlib_combined_counter_main_t * vcm = &load_balance_main.lbm_via_counters;
  61   u32 thread_index = vm->thread_index;
  62   u32 allowed_packets;
  63
  64   from = vlib_frame_vector_args (frame);
  65   n_left_from = frame->n_vectors;
  66   allowed_packets = n_left_from;
  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           ip6_header_t * ip0, * ip1;
  83           adl_config_main_t * ccm0, * ccm1;
  84           adl_config_data_t * c0, * c1;
  85           u32 lb_index0, lb_index1;
  86           const load_balance_t * lb0, *lb1;
  87           const dpo_id_t *dpo0, *dpo1;
  88
  89           /* Prefetch next iteration. */
  90           {
  91             vlib_buffer_t * p2, * p3;
  92
  93             p2 = vlib_get_buffer (vm, from[2]);
  94             p3 = vlib_get_buffer (vm, from[3]);
  95
  96             vlib_prefetch_buffer_header (p2, LOAD);
  97             vlib_prefetch_buffer_header (p3, LOAD);
  98
  99             CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
 100             CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
 101           }
 102
 103           /* speculatively enqueue b0 and b1 to the current next frame */
 104           to_next[0] = bi0 = from[0];
 105           to_next[1] = bi1 = from[1];
 106           from += 2;
 107           to_next += 2;
 108           n_left_from -= 2;
 109           n_left_to_next -= 2;
 110
 111           b0 = vlib_get_buffer (vm, bi0);
 112           sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
 113
 114           ip0 = vlib_buffer_get_current (b0);
 115
 116           ccm0 = cm->adl_config_mains + VNET_ADL_IP6;
 117
 118           c0 = vnet_get_config_data
 119               (&ccm0->config_main,
 120                &adl_buffer (b0)->adl.current_config_index,
 121                &next0,
 122                sizeof (c0[0]));
 123
 124           lb_index0 = ip6_fib_table_fwding_lookup (c0->fib_index,
 125                                                     &ip0->src_address);
 126           lb0 = load_balance_get (lb_index0);
 127           dpo0 = load_balance_get_bucket_i(lb0, 0);
 128
 129           if (PREDICT_FALSE(dpo0->dpoi_type != DPO_RECEIVE))
 130             {
 131               b0->error = node->errors[IP6_ADL_ALLOWLIST_ERROR_DROPPED];
 132               allowed_packets--;
 133               next0 = RX_ADL_DROP;
 134             }
 135
 136           b1 = vlib_get_buffer (vm, bi1);
 137           sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
 138
 139           ip1 = vlib_buffer_get_current (b1);
 140
 141           ccm1 = cm->adl_config_mains + VNET_ADL_IP6;
 142
 143           c1 = vnet_get_config_data
 144               (&ccm1->config_main,
 145                &adl_buffer (b1)->adl.current_config_index,
 146                &next1,
 147                sizeof (c1[0]));
 148
 149           lb_index1 = ip6_fib_table_fwding_lookup (c1->fib_index,
 150                                                     &ip1->src_address);
 151
 152           lb1 = load_balance_get (lb_index1);
 153           dpo1 = load_balance_get_bucket_i(lb1, 0);
 154
 155           vlib_increment_combined_counter
 156               (vcm, thread_index, lb_index0, 1,
 157                vlib_buffer_length_in_chain (vm, b0)
 158                + sizeof(ethernet_header_t));
 159
 160           vlib_increment_combined_counter
 161               (vcm, thread_index, lb_index1, 1,
 162                vlib_buffer_length_in_chain (vm, b1)
 163                + sizeof(ethernet_header_t));
 164
 165           if (PREDICT_FALSE(dpo1->dpoi_type != DPO_RECEIVE))
 166             {
 167               b1->error = node->errors[IP6_ADL_ALLOWLIST_ERROR_DROPPED];
 168               allowed_packets--;
 169               next1 = RX_ADL_DROP;
 170             }
 171
 172           if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
 173                             && (b0->flags & VLIB_BUFFER_IS_TRACED)))
 174             {
 175               ip6_adl_allowlist_trace_t *t =
 176                  vlib_add_trace (vm, node, b0, sizeof (*t));
 177               t->sw_if_index = sw_if_index0;
 178               t->next_index = next0;
 179             }
 180
 181           if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
 182                             && (b1->flags & VLIB_BUFFER_IS_TRACED)))
 183             {
 184               ip6_adl_allowlist_trace_t *t =
 185                  vlib_add_trace (vm, node, b1, sizeof (*t));
 186               t->sw_if_index = sw_if_index1;
 187               t->next_index = next1;
 188             }
 189
 190           /* verify speculative enqueues, maybe switch current next frame */
 191           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
 192                                            to_next, n_left_to_next,
 193                                            bi0, bi1, next0, next1);
 194         }
 195
 196       while (n_left_from > 0 && n_left_to_next > 0)
 197         {
 198           u32 bi0;
 199           vlib_buffer_t * b0;
 200           u32 next0;
 201           u32 sw_if_index0;
 202           ip6_header_t * ip0;
 203           adl_config_main_t *ccm0;
 204           adl_config_data_t *c0;
 205           u32 lb_index0;
 206           const load_balance_t * lb0;
 207           const dpo_id_t *dpo0;
 208
 209           /* speculatively enqueue b0 to the current next frame */
 210           bi0 = from[0];
 211           to_next[0] = bi0;
 212           from += 1;
 213           to_next += 1;
 214           n_left_from -= 1;
 215           n_left_to_next -= 1;
 216
 217           b0 = vlib_get_buffer (vm, bi0);
 218           sw_if_index0 = adl_buffer(b0)->sw_if_index[VLIB_RX];
 219
 220           ip0 = vlib_buffer_get_current (b0);
 221
 222           ccm0 = cm->adl_config_mains + VNET_ADL_IP6;
 223
 224           c0 = vnet_get_config_data
 225               (&ccm0->config_main,
 226                &adl_buffer (b0)->adl.current_config_index,
 227                &next0,
 228                sizeof (c0[0]));
 229
 230           lb_index0 = ip6_fib_table_fwding_lookup (c0->fib_index,
 231                                                     &ip0->src_address);
 232
 233           lb0 = load_balance_get (lb_index0);
 234           dpo0 = load_balance_get_bucket_i(lb0, 0);
 235
 236           vlib_increment_combined_counter
 237               (vcm, thread_index, lb_index0, 1,
 238                vlib_buffer_length_in_chain (vm, b0)
 239                + sizeof(ethernet_header_t));
 240
 241           if (PREDICT_FALSE(dpo0->dpoi_type != DPO_RECEIVE))
 242             {
 243               b0->error = node->errors[IP6_ADL_ALLOWLIST_ERROR_DROPPED];
 244               allowed_packets--;
 245               next0 = RX_ADL_DROP;
 246             }
 247
 248           if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
 249                             && (b0->flags & VLIB_BUFFER_IS_TRACED)))
 250             {
 251               ip6_adl_allowlist_trace_t *t =
 252                  vlib_add_trace (vm, node, b0, sizeof (*t));
 253               t->sw_if_index = sw_if_index0;
 254               t->next_index = next0;
 255             }
 256
 257           /* verify speculative enqueue, maybe switch current next frame */
 258           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 259                                            to_next, n_left_to_next,
 260                                            bi0, next0);
 261         }
 262
 263       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 264     }
 265   vlib_node_increment_counter (vm, node->node_index,
 266                                IP6_ADL_ALLOWLIST_ERROR_ALLOWED,
 267                                allowed_packets);
 268   return frame->n_vectors;
 269 }
 270
 271 VLIB_REGISTER_NODE (ip6_adl_allowlist_node) = {
 272   .name = "ip6-adl-allowlist",
 273   .vector_size = sizeof (u32),
 274   .format_trace = format_ip6_adl_allowlist_trace,
 275   .type = VLIB_NODE_TYPE_INTERNAL,
 276
 277   .n_errors = ARRAY_LEN(ip6_adl_allowlist_error_strings),
 278   .error_strings = ip6_adl_allowlist_error_strings,
 279
 280   .n_next_nodes = ADL_RX_N_FEATURES,
 281
 282   /* edit / add dispositions here */
 283   .next_nodes = {
 284     [IP4_RX_ADL_ALLOWLIST] = "ip4-adl-allowlist",
 285     [IP6_RX_ADL_ALLOWLIST] = "ip6-adl-allowlist",
 286     [DEFAULT_RX_ADL_ALLOWLIST] = "default-adl-allowlist",
 287     [IP4_RX_ADL_INPUT] = "ip4-input",
 288     [IP6_RX_ADL_INPUT] = "ip6-input",
 289     [DEFAULT_RX_ADL_INPUT] = "ethernet-input",
 290     [RX_ADL_DROP] = "error-drop",
 291   },
 292 };
 293
 294 static clib_error_t *
 295 ip6_allowlist_init (vlib_main_t * vm)
 296 {
 297   return 0;
 298 }
 299
 300 VLIB_INIT_FUNCTION (ip6_allowlist_init);