src/vnet/l2/l2_input.h - fdio/vpp - Gitiles

 /*
  * l2_input.h : layer 2 input packet processing
  *
  * Copyright (c) 2013 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #ifndef included_vnet_l2_input_h
 #define included_vnet_l2_input_h

 #include <vlib/vlib.h>
 #include <vnet/vnet.h>
 #include <vnet/l2/l2_bd.h>
 #include <vnet/ethernet/packet.h>
 #include <vnet/ip/ip.h>

 /* Per-subinterface L2 feature configuration */

 typedef struct
 {

   union
   {
     u16 bd_index;		/* bridge domain id */
     u32 output_sw_if_index;	/* for xconnect */
   };

   /* Interface mode. If both are 0, this interface is in L3 mode */
   u8 xconnect;
   u8 bridge;

   /* this is the bvi interface for the bridge-domain */
   u8 bvi;

   /* config for which input features are configured on this interface */
   u32 feature_bitmap;

   /* some of these flags are also in the feature bitmap */
   u8 learn_enable;
   u8 fwd_enable;
   u8 flood_enable;

   /* split horizon group */
   u8 shg;

 } l2_input_config_t;


 typedef struct
 {

   /* Next nodes for the feature bitmap */
   u32 feat_next_node_index[32];

   /* config vector indexed by sw_if_index */
   l2_input_config_t *configs;

   /* bridge domain config vector indexed by bd_index */
   l2_bridge_domain_t *bd_configs;

   /* convenience variables */
   vlib_main_t *vlib_main;
   vnet_main_t *vnet_main;
 } l2input_main_t;

 extern l2input_main_t l2input_main;

 extern vlib_node_registration_t l2input_node;

 static_always_inline l2_bridge_domain_t *
 l2input_bd_config_from_index (l2input_main_t * l2im, u32 bd_index)
 {
   l2_bridge_domain_t *bd_config;

   bd_config = vec_elt_at_index (l2im->bd_configs, bd_index);
   return bd_is_valid (bd_config) ? bd_config : NULL;
 }

 static_always_inline l2_bridge_domain_t *
 l2input_bd_config (u32 bd_index)
 {
   l2input_main_t *mp = &l2input_main;
   l2_bridge_domain_t *bd_config;

   vec_validate (mp->bd_configs, bd_index);
   bd_config = vec_elt_at_index (mp->bd_configs, bd_index);
   return bd_config;
 }

 /* L2 input indication packet is from BVI, using -2 */
 #define L2INPUT_BVI ((u32) (~0-1))

 /* L2 input features */

 /* Mappings from feature ID to graph node name in reverse order */
 #define foreach_l2input_feat                    \
  _(DROP,          "feature-bitmap-drop")        \
  _(XCONNECT,      "l2-output")                  \
  _(FLOOD,         "l2-flood")                   \
  _(ARP_TERM,      "arp-term-l2bd")              \
  _(UU_FLOOD,      "l2-flood")                   \
  _(FWD,           "l2-fwd")                     \
  _(RW,            "l2-rw")                      \
  _(LEARN,         "l2-learn")                   \
  _(VTR,           "l2-input-vtr")               \
  _(VPATH,         "vpath-input-l2")             \
  _(ACL,           "l2-input-acl")               \
  _(POLICER_CLAS,  "l2-policer-classify")	\
  _(INPUT_CLASSIFY, "l2-input-classify")         \
  _(SPAN,          "span-l2-input")

 /* Feature bitmap positions */
 typedef enum
 {
 #define _(sym,str) L2INPUT_FEAT_##sym##_BIT,
   foreach_l2input_feat
 #undef _
   L2INPUT_N_FEAT
 } l2input_feat_t;

 STATIC_ASSERT (L2INPUT_N_FEAT <= 32, "too many l2 input features");

 /* Feature bit masks */
 typedef enum
 {
 #define _(sym,str) L2INPUT_FEAT_##sym = (1<<L2INPUT_FEAT_##sym##_BIT),
   foreach_l2input_feat
 #undef _
     L2INPUT_VALID_MASK =
 #define _(sym,str) L2INPUT_FEAT_##sym |
     foreach_l2input_feat
 #undef _
   0
 } l2input_feat_masks_t;

 STATIC_ASSERT ((u64) L2INPUT_VALID_MASK == (1ull << L2INPUT_N_FEAT) - 1, "");

 /** Return an array of strings containing graph node names of each feature */
 char **l2input_get_feat_names (void);


 static_always_inline u8
 bd_feature_flood (l2_bridge_domain_t * bd_config)
 {
   return ((bd_config->feature_bitmap & L2INPUT_FEAT_FLOOD) ==
 	  L2INPUT_FEAT_FLOOD);
 }

 static_always_inline u8
 bd_feature_uu_flood (l2_bridge_domain_t * bd_config)
 {
   return ((bd_config->feature_bitmap & L2INPUT_FEAT_UU_FLOOD) ==
 	  L2INPUT_FEAT_UU_FLOOD);
 }

 static_always_inline u8
 bd_feature_forward (l2_bridge_domain_t * bd_config)
 {
   return ((bd_config->feature_bitmap & L2INPUT_FEAT_FWD) == L2INPUT_FEAT_FWD);
 }

 static_always_inline u8
 bd_feature_learn (l2_bridge_domain_t * bd_config)
 {
   return ((bd_config->feature_bitmap & L2INPUT_FEAT_LEARN) ==
 	  L2INPUT_FEAT_LEARN);
 }

 static_always_inline u8
 bd_feature_arp_term (l2_bridge_domain_t * bd_config)
 {
   return ((bd_config->feature_bitmap & L2INPUT_FEAT_ARP_TERM) ==
 	  L2INPUT_FEAT_ARP_TERM);
 }

 /** Masks for eliminating features that do not apply to a packet */

 /** Get a pointer to the config for the given interface */
 l2_input_config_t *l2input_intf_config (u32 sw_if_index);

 /* Enable (or disable) the feature in the bitmap for the given interface */
 u32 l2input_intf_bitmap_enable (u32 sw_if_index,
 				u32 feature_bitmap, u32 enable);

 /* Sets modifies flags from a bridge domain */
 u32 l2input_set_bridge_features (u32 bd_index, u32 feat_mask, u32 feat_value);


 #define MODE_L3        0
 #define MODE_L2_BRIDGE 1
 #define MODE_L2_XC     2
 #define MODE_L2_CLASSIFY 3

 #define MODE_ERROR_ETH        1
 #define MODE_ERROR_BVI_DEF    2

 u32 set_int_l2_mode (vlib_main_t * vm,
 		     vnet_main_t * vnet_main,
 		     u32 mode,
 		     u32 sw_if_index,
 		     u32 bd_index, u32 bvi, u32 shg, u32 xc_sw_if_index);

 static inline void
 vnet_update_l2_len (vlib_buffer_t * b)
 {
   ethernet_header_t *eth;
   u16 ethertype;
   u8 vlan_count = 0;

   /* point at currrent l2 hdr */
   eth = vlib_buffer_get_current (b);

   /*
    * l2-output pays no attention to this
    * but the tag push/pop code on an l2 subif needs it.
    *
    * Determine l2 header len, check for up to 2 vlans
    */
   vnet_buffer (b)->l2.l2_len = sizeof (ethernet_header_t);
   ethertype = clib_net_to_host_u16 (eth->type);
   if (ethernet_frame_is_tagged (ethertype))
     {
       ethernet_vlan_header_t *vlan;
       vnet_buffer (b)->l2.l2_len += sizeof (*vlan);
       vlan_count = 1;
       vlan = (void *) (eth + 1);
       ethertype = clib_net_to_host_u16 (vlan->type);
       if (ethertype == ETHERNET_TYPE_VLAN)
 	{
 	  vnet_buffer (b)->l2.l2_len += sizeof (*vlan);
 	  vlan_count = 2;
 	}
     }
   ethernet_buffer_set_vlan_count (b, vlan_count);
 }

 /*
  * Compute flow hash of an ethernet packet, use 5-tuple hash if L3 packet
  * is ip4 or ip6. Otherwise hash on smac/dmac/etype.
  * The vlib buffer current pointer is expected to be at ethernet header
  * and vnet l2.l2_len is exppected to be setup already.
  */
 static inline u32
 vnet_l2_compute_flow_hash (vlib_buffer_t * b)
 {
   ethernet_header_t *eh = vlib_buffer_get_current (b);
   u8 *l3h = (u8 *) eh + vnet_buffer (b)->l2.l2_len;
   u16 ethertype = clib_net_to_host_u16 (*(u16 *) (l3h - 2));

   if (ethertype == ETHERNET_TYPE_IP4)
     return ip4_compute_flow_hash ((ip4_header_t *) l3h, IP_FLOW_HASH_DEFAULT);
   else if (ethertype == ETHERNET_TYPE_IP6)
     return ip6_compute_flow_hash ((ip6_header_t *) l3h, IP_FLOW_HASH_DEFAULT);
   else
     {
       u32 a, b, c;
       u32 *ap = (u32 *) & eh->dst_address[2];
       u32 *bp = (u32 *) & eh->src_address[2];
       a = *ap;
       b = *bp;
       c = ethertype;
       hash_v3_mix32 (a, b, c);
       hash_v3_finalize32 (a, b, c);
       return c;
     }
 }

 #endif


 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* l2_input.h : layer 2 input packet processing
	*
	* Copyright (c) 2013 Cisco and/or its affiliates.
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at:
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#ifndef included_vnet_l2_input_h
	#define included_vnet_l2_input_h

	#include <vlib/vlib.h>
	#include <vnet/vnet.h>
	#include <vnet/l2/l2_bd.h>
	#include <vnet/ethernet/packet.h>
	#include <vnet/ip/ip.h>

	/* Per-subinterface L2 feature configuration */

	typedef struct
	{

	union
	{
	u16 bd_index; /* bridge domain id */
	u32 output_sw_if_index; /* for xconnect */
	};

	/* Interface mode. If both are 0, this interface is in L3 mode */
	u8 xconnect;
	u8 bridge;

	/* this is the bvi interface for the bridge-domain */
	u8 bvi;

	/* config for which input features are configured on this interface */
	u32 feature_bitmap;

	/* some of these flags are also in the feature bitmap */
	u8 learn_enable;
	u8 fwd_enable;
	u8 flood_enable;

	/* split horizon group */
	u8 shg;

	} l2_input_config_t;


	typedef struct
	{

	/* Next nodes for the feature bitmap */
	u32 feat_next_node_index[32];

	/* config vector indexed by sw_if_index */
	l2_input_config_t *configs;

	/* bridge domain config vector indexed by bd_index */
	l2_bridge_domain_t *bd_configs;

	/* convenience variables */
	vlib_main_t *vlib_main;
	vnet_main_t *vnet_main;
	} l2input_main_t;

	extern l2input_main_t l2input_main;

	extern vlib_node_registration_t l2input_node;

	static_always_inline l2_bridge_domain_t *
	l2input_bd_config_from_index (l2input_main_t * l2im, u32 bd_index)
	{
	l2_bridge_domain_t *bd_config;

	bd_config = vec_elt_at_index (l2im->bd_configs, bd_index);
	return bd_is_valid (bd_config) ? bd_config : NULL;
	}

	static_always_inline l2_bridge_domain_t *
	l2input_bd_config (u32 bd_index)
	{
	l2input_main_t *mp = &l2input_main;
	l2_bridge_domain_t *bd_config;

	vec_validate (mp->bd_configs, bd_index);
	bd_config = vec_elt_at_index (mp->bd_configs, bd_index);
	return bd_config;
	}

	/* L2 input indication packet is from BVI, using -2 */
	#define L2INPUT_BVI ((u32) (~0-1))

	/* L2 input features */

	/* Mappings from feature ID to graph node name in reverse order */
	#define foreach_l2input_feat \
	_(DROP, "feature-bitmap-drop") \
	_(XCONNECT, "l2-output") \
	_(FLOOD, "l2-flood") \
	_(ARP_TERM, "arp-term-l2bd") \
	_(UU_FLOOD, "l2-flood") \
	_(FWD, "l2-fwd") \
	_(RW, "l2-rw") \
	_(LEARN, "l2-learn") \
	_(VTR, "l2-input-vtr") \
	_(VPATH, "vpath-input-l2") \
	_(ACL, "l2-input-acl") \
	_(POLICER_CLAS, "l2-policer-classify") \
	_(INPUT_CLASSIFY, "l2-input-classify") \
	_(SPAN, "span-l2-input")

	/* Feature bitmap positions */
	typedef enum
	{
	#define _(sym,str) L2INPUT_FEAT_##sym##_BIT,
	foreach_l2input_feat
	#undef _
	L2INPUT_N_FEAT
	} l2input_feat_t;

	STATIC_ASSERT (L2INPUT_N_FEAT <= 32, "too many l2 input features");

	/* Feature bit masks */
	typedef enum
	{
	#define _(sym,str) L2INPUT_FEAT_##sym = (1<<L2INPUT_FEAT_##sym##_BIT),
	foreach_l2input_feat
	#undef _
	L2INPUT_VALID_MASK =
	#define _(sym,str) L2INPUT_FEAT_##sym \|
	foreach_l2input_feat
	#undef _
	0
	} l2input_feat_masks_t;

	STATIC_ASSERT ((u64) L2INPUT_VALID_MASK == (1ull << L2INPUT_N_FEAT) - 1, "");

	/** Return an array of strings containing graph node names of each feature */
	char **l2input_get_feat_names (void);


	static_always_inline u8
	bd_feature_flood (l2_bridge_domain_t * bd_config)
	{
	return ((bd_config->feature_bitmap & L2INPUT_FEAT_FLOOD) ==
	L2INPUT_FEAT_FLOOD);
	}

	static_always_inline u8
	bd_feature_uu_flood (l2_bridge_domain_t * bd_config)
	{
	return ((bd_config->feature_bitmap & L2INPUT_FEAT_UU_FLOOD) ==
	L2INPUT_FEAT_UU_FLOOD);
	}

	static_always_inline u8
	bd_feature_forward (l2_bridge_domain_t * bd_config)
	{
	return ((bd_config->feature_bitmap & L2INPUT_FEAT_FWD) == L2INPUT_FEAT_FWD);
	}

	static_always_inline u8
	bd_feature_learn (l2_bridge_domain_t * bd_config)
	{
	return ((bd_config->feature_bitmap & L2INPUT_FEAT_LEARN) ==
	L2INPUT_FEAT_LEARN);
	}

	static_always_inline u8
	bd_feature_arp_term (l2_bridge_domain_t * bd_config)
	{
	return ((bd_config->feature_bitmap & L2INPUT_FEAT_ARP_TERM) ==
	L2INPUT_FEAT_ARP_TERM);
	}

	/** Masks for eliminating features that do not apply to a packet */

	/** Get a pointer to the config for the given interface */
	l2_input_config_t *l2input_intf_config (u32 sw_if_index);

	/* Enable (or disable) the feature in the bitmap for the given interface */
	u32 l2input_intf_bitmap_enable (u32 sw_if_index,
	u32 feature_bitmap, u32 enable);

	/* Sets modifies flags from a bridge domain */
	u32 l2input_set_bridge_features (u32 bd_index, u32 feat_mask, u32 feat_value);


	#define MODE_L3 0
	#define MODE_L2_BRIDGE 1
	#define MODE_L2_XC 2
	#define MODE_L2_CLASSIFY 3

	#define MODE_ERROR_ETH 1
	#define MODE_ERROR_BVI_DEF 2

	u32 set_int_l2_mode (vlib_main_t * vm,
	vnet_main_t * vnet_main,
	u32 mode,
	u32 sw_if_index,
	u32 bd_index, u32 bvi, u32 shg, u32 xc_sw_if_index);

	static inline void
	vnet_update_l2_len (vlib_buffer_t * b)
	{
	ethernet_header_t *eth;
	u16 ethertype;
	u8 vlan_count = 0;

	/* point at currrent l2 hdr */
	eth = vlib_buffer_get_current (b);

	/*
	* l2-output pays no attention to this
	* but the tag push/pop code on an l2 subif needs it.
	*
	* Determine l2 header len, check for up to 2 vlans
	*/
	vnet_buffer (b)->l2.l2_len = sizeof (ethernet_header_t);
	ethertype = clib_net_to_host_u16 (eth->type);
	if (ethernet_frame_is_tagged (ethertype))
	{
	ethernet_vlan_header_t *vlan;
	vnet_buffer (b)->l2.l2_len += sizeof (*vlan);
	vlan_count = 1;
	vlan = (void *) (eth + 1);
	ethertype = clib_net_to_host_u16 (vlan->type);
	if (ethertype == ETHERNET_TYPE_VLAN)
	{
	vnet_buffer (b)->l2.l2_len += sizeof (*vlan);
	vlan_count = 2;
	}
	}
	ethernet_buffer_set_vlan_count (b, vlan_count);
	}

	/*
	* Compute flow hash of an ethernet packet, use 5-tuple hash if L3 packet
	* is ip4 or ip6. Otherwise hash on smac/dmac/etype.
	* The vlib buffer current pointer is expected to be at ethernet header
	* and vnet l2.l2_len is exppected to be setup already.
	*/
	static inline u32
	vnet_l2_compute_flow_hash (vlib_buffer_t * b)
	{
	ethernet_header_t *eh = vlib_buffer_get_current (b);
	u8 l3h = (u8 ) eh + vnet_buffer (b)->l2.l2_len;
	u16 ethertype = clib_net_to_host_u16 ((u16 ) (l3h - 2));

	if (ethertype == ETHERNET_TYPE_IP4)
	return ip4_compute_flow_hash ((ip4_header_t *) l3h, IP_FLOW_HASH_DEFAULT);
	else if (ethertype == ETHERNET_TYPE_IP6)
	return ip6_compute_flow_hash ((ip6_header_t *) l3h, IP_FLOW_HASH_DEFAULT);
	else
	{
	u32 a, b, c;
	u32 ap = (u32 ) & eh->dst_address[2];
	u32 bp = (u32 ) & eh->src_address[2];
	a = *ap;
	b = *bp;
	c = ethertype;
	hash_v3_mix32 (a, b, c);
	hash_v3_finalize32 (a, b, c);
	return c;
	}
	}

	#endif


	/*
	* fd.io coding-style-patch-verification: ON
	*
	* Local Variables:
	* eval: (c-set-style "gnu")
	* End:
	*/