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           gbp_policy_next_t next0;
  89           gbp_contract_key_t key0;
  90           gbp_contract_value_t value0 = {
  91             .as_u64 = ~0,
  92           };
  93           u32 bi0, sw_if_index0;
  94           vlib_buffer_t *b0;
  95
  96           next0 = GBP_POLICY_NEXT_DENY;
  97           bi0 = from[0];
  98           to_next[0] = bi0;
  99           from += 1;
 100           to_next += 1;
 101           n_left_from -= 1;
 102           n_left_to_next -= 1;
 103
 104           b0 = vlib_get_buffer (vm, bi0);
 105
 106           /*
 107            * determine the src and dst EPG
 108            */
 109           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
 110           key0.gck_dst = gbp_port_to_epg (sw_if_index0);
 111           key0.gck_src = vnet_buffer2 (b0)->gbp.src_epg;
 112
 113           if (~0 != key0.gck_src)
 114             {
 115               if (PREDICT_FALSE (key0.gck_src == key0.gck_dst))
 116                 {
 117                   /*
 118                    * intra-epg allowed
 119                    */
 120                   next0 = vnet_l2_feature_next (b0, gpm->l2_output_feat_next,
 121                                                 L2OUTPUT_FEAT_GBP_POLICY);
 122                 }
 123               else
 124                 {
 125                   value0.as_u64 = gbp_acl_lookup (&key0);
 126
 127                   if (~0 != value0.gc_lc_index)
 128                     {
 129                       fa_5tuple_opaque_t pkt_5tuple0;
 130                       u8 action0 = 0;
 131                       u32 acl_pos_p0, acl_match_p0;
 132                       u32 rule_match_p0, trace_bitmap0;
 133                       u8 *h0, l2_len0;
 134                       u16 ether_type0;
 135                       u8 is_ip60 = 0;
 136
 137                       l2_len0 = vnet_buffer (b0)->l2.l2_len;
 138                       h0 = vlib_buffer_get_current (b0);
 139
 140                       ether_type0 =
 141                         clib_net_to_host_u16 (*(u16 *) (h0 + l2_len0 - 2));
 142
 143                       is_ip60 = (ether_type0 == ETHERNET_TYPE_IP6) ? 1 : 0;
 144                       /*
 145                        * tests against the ACL
 146                        */
 147                       acl_plugin_fill_5tuple_inline (gm->
 148                                                      acl_plugin.p_acl_main,
 149                                                      value0.gc_lc_index, b0,
 150                                                      is_ip60,
 151                                                      /* is_input */ 0,
 152                                                      /* is_l2_path */ 1,
 153                                                      &pkt_5tuple0);
 154                       acl_plugin_match_5tuple_inline (gm->
 155                                                       acl_plugin.p_acl_main,
 156                                                       value0.gc_lc_index,
 157                                                       &pkt_5tuple0, is_ip60,
 158                                                       &action0, &acl_pos_p0,
 159                                                       &acl_match_p0,
 160                                                       &rule_match_p0,
 161                                                       &trace_bitmap0);
 162
 163                       if (action0 > 0)
 164                         next0 =
 165                           vnet_l2_feature_next (b0, gpm->l2_output_feat_next,
 166                                                 L2OUTPUT_FEAT_GBP_POLICY);
 167                     }
 168                 }
 169             }
 170           else
 171             {
 172               /*
 173                * the src EPG is not set when the packet arrives on an EPG
 174                * uplink interface and we do not need to apply policy
 175                */
 176               next0 = vnet_l2_feature_next (b0, gpm->l2_output_feat_next,
 177                                             L2OUTPUT_FEAT_GBP_POLICY);
 178             }
 179
 180           if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
 181             {
 182               gbp_policy_trace_t *t =
 183                 vlib_add_trace (vm, node, b0, sizeof (*t));
 184               t->src_epg = key0.gck_src;
 185               t->dst_epg = key0.gck_dst;
 186               t->acl_index = value0.gc_acl_index;
 187             }
 188
 189           /* verify speculative enqueue, maybe switch current next frame */
 190           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 191                                            to_next, n_left_to_next,
 192                                            bi0, next0);
 193         }
 194
 195       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 196     }
 197
 198   return frame->n_vectors;
 199 }
 200
 201 /* packet trace format function */
 202 static u8 *
 203 format_gbp_policy_trace (u8 * s, va_list * args)
 204 {
 205   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 206   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 207   gbp_policy_trace_t *t = va_arg (*args, gbp_policy_trace_t *);
 208
 209   s =
 210     format (s, "src:%d, dst:%d, acl:%d", t->src_epg, t->dst_epg,
 211             t->acl_index);
 212
 213   return s;
 214 }
 215
 216 /* *INDENT-OFF* */
 217 VLIB_REGISTER_NODE (gbp_policy_node) = {
 218   .function = gbp_policy,
 219   .name = "gbp-policy",
 220   .vector_size = sizeof (u32),
 221   .format_trace = format_gbp_policy_trace,
 222   .type = VLIB_NODE_TYPE_INTERNAL,
 223
 224   .n_errors = ARRAY_LEN(gbp_policy_error_strings),
 225   .error_strings = gbp_policy_error_strings,
 226
 227   .n_next_nodes = GBP_POLICY_N_NEXT,
 228
 229   .next_nodes = {
 230     [GBP_POLICY_NEXT_DENY] = "error-drop",
 231   },
 232 };
 233
 234 VLIB_NODE_FUNCTION_MULTIARCH (gbp_policy_node, gbp_policy);
 235
 236 /* *INDENT-ON* */
 237
 238 static clib_error_t *
 239 gbp_policy_init (vlib_main_t * vm)
 240 {
 241   gbp_policy_main_t *gpm = &gbp_policy_main;
 242   clib_error_t *error = 0;
 243
 244   /* Initialize the feature next-node indexes */
 245   feat_bitmap_init_next_nodes (vm,
 246                                gbp_policy_node.index,
 247                                L2OUTPUT_N_FEAT,
 248                                l2output_get_feat_names (),
 249                                gpm->l2_output_feat_next);
 250
 251   return error;
 252 }
 253
 254 VLIB_INIT_FUNCTION (gbp_policy_init);
 255
 256 /*
 257  * fd.io coding-style-patch-verification: ON
 258  *
 259  * Local Variables:
 260  * eval: (c-set-style "gnu")
 261  * End:
 262  */