vnet/vnet/l2/l2_input.h

   1 /*
   2  * l2_input.h : layer 2 input packet processing
   3  *
   4  * Copyright (c) 2013 Cisco and/or its affiliates.
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at:
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #ifndef included_vnet_l2_input_h
  19 #define included_vnet_l2_input_h
  20
  21 #include <vlib/vlib.h>
  22 #include <vnet/vnet.h>
  23 #include <vnet/l2/l2_bd.h>
  24 #include <vnet/ethernet/packet.h>
  25 #include <vnet/ip/ip.h>
  26
  27 /* Per-subinterface L2 feature configuration */
  28
  29 typedef struct
  30 {
  31
  32   union
  33   {
  34     u16 bd_index;               /* bridge domain id */
  35     u32 output_sw_if_index;     /* for xconnect */
  36   };
  37
  38   /* Interface mode. If both are 0, this interface is in L3 mode */
  39   u8 xconnect;
  40   u8 bridge;
  41
  42   /* this is the bvi interface for the bridge-domain */
  43   u8 bvi;
  44
  45   /* config for which input features are configured on this interface */
  46   u32 feature_bitmap;
  47
  48   /* some of these flags are also in the feature bitmap */
  49   u8 learn_enable;
  50   u8 fwd_enable;
  51   u8 flood_enable;
  52
  53   /* split horizon group */
  54   u8 shg;
  55
  56 } l2_input_config_t;
  57
  58
  59 typedef struct
  60 {
  61
  62   /* Next nodes for the feature bitmap */
  63   u32 feat_next_node_index[32];
  64
  65   /* config vector indexed by sw_if_index */
  66   l2_input_config_t *configs;
  67
  68   /* bridge domain config vector indexed by bd_index */
  69   l2_bridge_domain_t *bd_configs;
  70
  71   /* convenience variables */
  72   vlib_main_t *vlib_main;
  73   vnet_main_t *vnet_main;
  74 } l2input_main_t;
  75
  76 extern l2input_main_t l2input_main;
  77
  78 extern vlib_node_registration_t l2input_node;
  79
  80 static_always_inline l2_bridge_domain_t *
  81 l2input_bd_config_from_index (l2input_main_t * l2im, u32 bd_index)
  82 {
  83   l2_bridge_domain_t *bd_config;
  84
  85   bd_config = vec_elt_at_index (l2im->bd_configs, bd_index);
  86   return bd_is_valid (bd_config) ? bd_config : NULL;
  87 }
  88
  89 /* L2 input features */
  90
  91 /* Mappings from feature ID to graph node name */
  92 #define foreach_l2input_feat                    \
  93  _(DROP,          "feature-bitmap-drop")        \
  94  _(XCONNECT,      "l2-output")                  \
  95  _(IPIW,          "feature-bitmap-drop")        \
  96  _(FLOOD,         "l2-flood")                   \
  97  _(ARP_TERM,      "arp-term-l2bd")              \
  98  _(UU_FLOOD,      "l2-flood")                   \
  99  _(FWD,           "l2-fwd")                     \
 100  _(RW,            "l2-rw")                      \
 101  _(LEARN,         "l2-learn")                   \
 102  _(VTR,           "l2-input-vtr")               \
 103  _(VPATH,         "vpath-input-l2")             \
 104  _(CTRL_PKT,      "feature-bitmap-drop")        \
 105  _(L2PT,          "feature-bitmap-drop")        \
 106  _(IGMP_SNOOP,    "feature-bitmap-drop")        \
 107  _(MLD_SNOOP,     "feature-bitmap-drop")        \
 108  _(DHCP_SNOOP,    "feature-bitmap-drop")        \
 109  _(DAI,           "feature-bitmap-drop")        \
 110  _(IPSG,          "feature-bitmap-drop")        \
 111  _(ACL,           "l2-input-acl")               \
 112  _(QOS,           "feature-bitmap-drop")        \
 113  _(CFM,           "feature-bitmap-drop")        \
 114  _(SPAN,          "feature-bitmap-drop")        \
 115  _(POLICER_CLAS,  "l2-policer-classify")        \
 116  _(INPUT_CLASSIFY, "l2-input-classify")
 117
 118 /* Feature bitmap positions */
 119 typedef enum
 120 {
 121 #define _(sym,str) L2INPUT_FEAT_##sym##_BIT,
 122   foreach_l2input_feat
 123 #undef _
 124     L2INPUT_N_FEAT,
 125 } l2input_feat_t;
 126
 127 /* Feature bit masks */
 128 typedef enum
 129 {
 130 #define _(sym,str) L2INPUT_FEAT_##sym = (1<<L2INPUT_FEAT_##sym##_BIT),
 131   foreach_l2input_feat
 132 #undef _
 133 } l2input_feat_masks_t;
 134
 135 /** Return an array of strings containing graph node names of each feature */
 136 char **l2input_get_feat_names (void);
 137
 138
 139 static_always_inline u8
 140 bd_feature_flood (l2_bridge_domain_t * bd_config)
 141 {
 142   return ((bd_config->feature_bitmap & L2INPUT_FEAT_FLOOD) ==
 143           L2INPUT_FEAT_FLOOD);
 144 }
 145
 146 static_always_inline u8
 147 bd_feature_uu_flood (l2_bridge_domain_t * bd_config)
 148 {
 149   return ((bd_config->feature_bitmap & L2INPUT_FEAT_UU_FLOOD) ==
 150           L2INPUT_FEAT_UU_FLOOD);
 151 }
 152
 153 static_always_inline u8
 154 bd_feature_forward (l2_bridge_domain_t * bd_config)
 155 {
 156   return ((bd_config->feature_bitmap & L2INPUT_FEAT_FWD) == L2INPUT_FEAT_FWD);
 157 }
 158
 159 static_always_inline u8
 160 bd_feature_learn (l2_bridge_domain_t * bd_config)
 161 {
 162   return ((bd_config->feature_bitmap & L2INPUT_FEAT_LEARN) ==
 163           L2INPUT_FEAT_LEARN);
 164 }
 165
 166 static_always_inline u8
 167 bd_feature_arp_term (l2_bridge_domain_t * bd_config)
 168 {
 169   return ((bd_config->feature_bitmap & L2INPUT_FEAT_ARP_TERM) ==
 170           L2INPUT_FEAT_ARP_TERM);
 171 }
 172
 173 /** Masks for eliminating features that do not apply to a packet */
 174
 175 #define IP4_FEAT_MASK  ~(L2INPUT_FEAT_CTRL_PKT    | \
 176                          L2INPUT_FEAT_MLD_SNOOP   | \
 177                          L2INPUT_FEAT_L2PT        | \
 178                          L2INPUT_FEAT_CFM         | \
 179                          L2INPUT_FEAT_DAI)
 180
 181 #define IP6_FEAT_MASK  ~(L2INPUT_FEAT_CTRL_PKT    | \
 182                          L2INPUT_FEAT_IGMP_SNOOP  | \
 183                          L2INPUT_FEAT_L2PT        | \
 184                          L2INPUT_FEAT_CFM         | \
 185                          L2INPUT_FEAT_DAI)
 186
 187 #define IP_UDP_TCP_FEAT_MASK  ~(L2INPUT_FEAT_CTRL_PKT   | \
 188                                 L2INPUT_FEAT_L2PT       | \
 189                                 L2INPUT_FEAT_IGMP_SNOOP | \
 190                                 L2INPUT_FEAT_MLD_SNOOP  | \
 191                                 L2INPUT_FEAT_DHCP_SNOOP | \
 192                                 L2INPUT_FEAT_CFM        | \
 193                                 L2INPUT_FEAT_DAI)
 194
 195 #define MPLS_FEAT_MASK  ~(L2INPUT_FEAT_CTRL_PKT   | \
 196                           L2INPUT_FEAT_L2PT       | \
 197                           L2INPUT_FEAT_IGMP_SNOOP | \
 198                           L2INPUT_FEAT_MLD_SNOOP  | \
 199                           L2INPUT_FEAT_DHCP_SNOOP | \
 200                           L2INPUT_FEAT_CFM        | \
 201                           L2INPUT_FEAT_DAI)
 202
 203
 204 /** Get a pointer to the config for the given interface */
 205 l2_input_config_t *l2input_intf_config (u32 sw_if_index);
 206
 207 /* Enable (or disable) the feature in the bitmap for the given interface */
 208 u32 l2input_intf_bitmap_enable (u32 sw_if_index,
 209                                 u32 feature_bitmap, u32 enable);
 210
 211 /* Sets modifies flags from a bridge domain */
 212 u32 l2input_set_bridge_features (u32 bd_index, u32 feat_mask, u32 feat_value);
 213
 214
 215 #define MODE_L3        0
 216 #define MODE_L2_BRIDGE 1
 217 #define MODE_L2_XC     2
 218 #define MODE_L2_CLASSIFY 3
 219
 220 #define MODE_ERROR_ETH        1
 221 #define MODE_ERROR_BVI_DEF    2
 222
 223 u32 set_int_l2_mode (vlib_main_t * vm,
 224                      vnet_main_t * vnet_main,
 225                      u32 mode,
 226                      u32 sw_if_index,
 227                      u32 bd_index, u32 bvi, u32 shg, u32 xc_sw_if_index);
 228
 229 static inline void
 230 vnet_update_l2_len (vlib_buffer_t * b)
 231 {
 232   ethernet_header_t *eth;
 233   u16 ethertype;
 234   u8 vlan_count = 0;
 235
 236   /* point at currrent l2 hdr */
 237   eth = vlib_buffer_get_current (b);
 238
 239   /*
 240    * l2-output pays no attention to this
 241    * but the tag push/pop code on an l2 subif needs it.
 242    *
 243    * Determine l2 header len, check for up to 2 vlans
 244    */
 245   vnet_buffer (b)->l2.l2_len = sizeof (ethernet_header_t);
 246   ethertype = clib_net_to_host_u16 (eth->type);
 247   if (ethernet_frame_is_tagged (ethertype))
 248     {
 249       ethernet_vlan_header_t *vlan;
 250       vnet_buffer (b)->l2.l2_len += sizeof (*vlan);
 251       vlan_count = 1;
 252       vlan = (void *) (eth + 1);
 253       ethertype = clib_net_to_host_u16 (vlan->type);
 254       if (ethertype == ETHERNET_TYPE_VLAN)
 255         {
 256           vnet_buffer (b)->l2.l2_len += sizeof (*vlan);
 257           vlan_count = 2;
 258         }
 259     }
 260   ethernet_buffer_set_vlan_count (b, vlan_count);
 261 }
 262
 263 /*
 264  * Compute flow hash of an ethernet packet, use 5-tuple hash if L3 packet
 265  * is ip4 or ip6. Otherwise hash on smac/dmac/etype.
 266  * The vlib buffer current pointer is expected to be at ethernet header
 267  * and vnet l2.l2_len is exppected to be setup already.
 268  */
 269 static inline u32
 270 vnet_l2_compute_flow_hash (vlib_buffer_t * b)
 271 {
 272   ethernet_header_t *eh = vlib_buffer_get_current (b);
 273   u8 *l3h = (u8 *) eh + vnet_buffer (b)->l2.l2_len;
 274   u16 ethertype = clib_net_to_host_u16 (*(u16 *) (l3h - 2));
 275
 276   if (ethertype == ETHERNET_TYPE_IP4)
 277     return ip4_compute_flow_hash ((ip4_header_t *) l3h, IP_FLOW_HASH_DEFAULT);
 278   else if (ethertype == ETHERNET_TYPE_IP6)
 279     return ip6_compute_flow_hash ((ip6_header_t *) l3h, IP_FLOW_HASH_DEFAULT);
 280   else
 281     {
 282       u32 a, b, c;
 283       u32 *ap = (u32 *) & eh->dst_address[2];
 284       u32 *bp = (u32 *) & eh->src_address[2];
 285       a = *ap;
 286       b = *bp;
 287       c = ethertype;
 288       hash_v3_mix32 (a, b, c);
 289       hash_v3_finalize32 (a, b, c);
 290       return c;
 291     }
 292 }
 293
 294 #endif
 295
 296
 297 /*
 298  * fd.io coding-style-patch-verification: ON
 299  *
 300  * Local Variables:
 301  * eval: (c-set-style "gnu")
 302  * End:
 303  */