src/plugins/gbp/gbp_policy.c

   1 /*
   2  * Copyright (c) 2018 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 <plugins/gbp/gbp.h>
  17
  18 /**
  19  * Grouping of global data for the GBP source EPG classification feature
  20  */
  21 typedef struct gbp_policy_main_t_
  22 {
  23   /**
  24    * Next nodes for L2 output features
  25    */
  26   u32 l2_output_feat_next[32];
  27 } gbp_policy_main_t;
  28
  29 static gbp_policy_main_t gbp_policy_main;
  30
  31 #define foreach_gbp_policy                      \
  32   _(DENY,    "deny")
  33
  34 typedef enum
  35 {
  36 #define _(sym,str) GBP_ERROR_##sym,
  37   foreach_gbp_policy
  38 #undef _
  39     GBP_POLICY_N_ERROR,
  40 } gbp_policy_error_t;
  41
  42 static char *gbp_policy_error_strings[] = {
  43 #define _(sym,string) string,
  44   foreach_gbp_policy
  45 #undef _
  46 };
  47
  48 typedef enum
  49 {
  50 #define _(sym,str) GBP_POLICY_NEXT_##sym,
  51   foreach_gbp_policy
  52 #undef _
  53     GBP_POLICY_N_NEXT,
  54 } gbp_policy_next_t;
  55
  56 /**
  57  * per-packet trace data
  58  */
  59 typedef struct gbp_policy_trace_t_
  60 {
  61   /* per-pkt trace data */
  62   epg_id_t src_epg;
  63   epg_id_t dst_epg;
  64   u32 acl_index;
  65 } gbp_policy_trace_t;
  66
  67 static uword
  68 gbp_policy (vlib_main_t * vm,
  69             vlib_node_runtime_t * node, vlib_frame_t * frame)
  70 {
  71   gbp_main_t *gm = &gbp_main;
  72   gbp_policy_main_t *gpm = &gbp_policy_main;
  73   u32 n_left_from, *from, *to_next;
  74   u32 next_index;
  75
  76   next_index = 0;
  77   n_left_from = frame->n_vectors;
  78   from = vlib_frame_vector_args (frame);
  79
  80   while (n_left_from > 0)
  81     {
  82       u32 n_left_to_next;
  83
  84       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
  85
  86       while (n_left_from > 0 && n_left_to_next > 0)
  87         {
  88           const gbp_endpoint_t *gep0;
  89           gbp_policy_next_t next0;
  90           gbp_contract_key_t key0;
  91           gbp_contract_value_t value0 = {
  92             .as_u64 = ~0,
  93           };
  94           u32 bi0, sw_if_index0;
  95           vlib_buffer_t *b0;
  96
  97           next0 = GBP_POLICY_NEXT_DENY;
  98           bi0 = from[0];
  99           to_next[0] = bi0;
 100           from += 1;
 101           to_next += 1;
 102           n_left_from -= 1;
 103           n_left_to_next -= 1;
 104
 105           b0 = vlib_get_buffer (vm, bi0);
 106
 107           /*
 108            * determine the src and dst EPG
 109            */
 110           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
 111           gep0 = gbp_endpoint_get_itf (sw_if_index0);
 112           key0.gck_dst = gep0->ge_epg_id;
 113           key0.gck_src = vnet_buffer2 (b0)->gbp.src_epg;
 114
 115           if (EPG_INVALID != key0.gck_src)
 116             {
 117               if (PREDICT_FALSE (key0.gck_src == key0.gck_dst))
 118                 {
 119                   /*
 120                    * intra-epg allowed
 121                    */
 122                   next0 = vnet_l2_feature_next (b0, gpm->l2_output_feat_next,
 123                                                 L2OUTPUT_FEAT_GBP_POLICY);
 124                 }
 125               else
 126                 {
 127                   value0.as_u64 = gbp_acl_lookup (&key0);
 128
 129                   if (~0 != value0.gc_lc_index)
 130                     {
 131                       fa_5tuple_opaque_t pkt_5tuple0;
 132                       u8 action0 = 0;
 133                       u32 acl_pos_p0, acl_match_p0;
 134                       u32 rule_match_p0, trace_bitmap0;
 135                       u8 *h0, l2_len0;
 136                       u16 ether_type0;
 137                       u8 is_ip60 = 0;
 138
 139                       l2_len0 = vnet_buffer (b0)->l2.l2_len;
 140                       h0 = vlib_buffer_get_current (b0);
 141
 142                       ether_type0 =
 143                         clib_net_to_host_u16 (*(u16 *) (h0 + l2_len0 - 2));
 144
 145                       is_ip60 = (ether_type0 == ETHERNET_TYPE_IP6) ? 1 : 0;
 146                       /*
 147                        * tests against the ACL
 148                        */
 149                       acl_plugin_fill_5tuple_inline (gm->
 150                                                      acl_plugin.p_acl_main,
 151                                                      value0.gc_lc_index, b0,
 152                                                      is_ip60,
 153                                                      /* is_input */ 0,
 154                                                      /* is_l2_path */ 1,
 155                                                      &pkt_5tuple0);
 156                       acl_plugin_match_5tuple_inline (gm->
 157                                                       acl_plugin.p_acl_main,
 158                                                       value0.gc_lc_index,
 159                                                       &pkt_5tuple0, is_ip60,
 160                                                       &action0, &acl_pos_p0,
 161                                                       &acl_match_p0,
 162                                                       &rule_match_p0,
 163                                                       &trace_bitmap0);
 164
 165                       if (action0 > 0)
 166                         next0 =
 167                           vnet_l2_feature_next (b0, gpm->l2_output_feat_next,
 168                                                 L2OUTPUT_FEAT_GBP_POLICY);
 169                     }
 170                 }
 171             }
 172           else
 173             {
 174               /*
 175                * the src EPG is not set when the packet arrives on an EPG
 176                * uplink interface and we do not need to apply policy
 177                */
 178               next0 = vnet_l2_feature_next (b0, gpm->l2_output_feat_next,
 179                                             L2OUTPUT_FEAT_GBP_POLICY);
 180             }
 181
 182           if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
 183             {
 184               gbp_policy_trace_t *t =
 185                 vlib_add_trace (vm, node, b0, sizeof (*t));
 186               t->src_epg = key0.gck_src;
 187               t->dst_epg = key0.gck_dst;
 188               t->acl_index = value0.gc_acl_index;
 189             }
 190
 191           /* verify speculative enqueue, maybe switch current next frame */
 192           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 193                                            to_next, n_left_to_next,
 194                                            bi0, next0);
 195         }
 196
 197       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 198     }
 199
 200   return frame->n_vectors;
 201 }
 202
 203 /* packet trace format function */
 204 static u8 *
 205 format_gbp_policy_trace (u8 * s, va_list * args)
 206 {
 207   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 208   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 209   gbp_policy_trace_t *t = va_arg (*args, gbp_policy_trace_t *);
 210
 211   s =
 212     format (s, "src:%d, dst:%d, acl:%d", t->src_epg, t->dst_epg,
 213             t->acl_index);
 214
 215   return s;
 216 }
 217
 218 /* *INDENT-OFF* */
 219 VLIB_REGISTER_NODE (gbp_policy_node) = {
 220   .function = gbp_policy,
 221   .name = "gbp-policy",
 222   .vector_size = sizeof (u32),
 223   .format_trace = format_gbp_policy_trace,
 224   .type = VLIB_NODE_TYPE_INTERNAL,
 225
 226   .n_errors = ARRAY_LEN(gbp_policy_error_strings),
 227   .error_strings = gbp_policy_error_strings,
 228
 229   .n_next_nodes = GBP_POLICY_N_NEXT,
 230
 231   .next_nodes = {
 232     [GBP_POLICY_NEXT_DENY] = "error-drop",
 233   },
 234 };
 235
 236 VLIB_NODE_FUNCTION_MULTIARCH (gbp_policy_node, gbp_policy);
 237
 238 /* *INDENT-ON* */
 239
 240 static clib_error_t *
 241 gbp_policy_init (vlib_main_t * vm)
 242 {
 243   gbp_policy_main_t *gpm = &gbp_policy_main;
 244   clib_error_t *error = 0;
 245
 246   /* Initialize the feature next-node indexes */
 247   feat_bitmap_init_next_nodes (vm,
 248                                gbp_policy_node.index,
 249                                L2OUTPUT_N_FEAT,
 250                                l2output_get_feat_names (),
 251                                gpm->l2_output_feat_next);
 252
 253   return error;
 254 }
 255
 256 VLIB_INIT_FUNCTION (gbp_policy_init);
 257
 258 /*
 259  * fd.io coding-style-patch-verification: ON
 260  *
 261  * Local Variables:
 262  * eval: (c-set-style "gnu")
 263  * End:
 264  */