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/*
* 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 ID */
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;
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;
}
// L2 input features
// Mappings from feature ID to graph node name
#define foreach_l2input_feat \
_(DROP, "feature-bitmap-drop") \
_(CLASSIFY, "l2-classify") \
_(XCONNECT, "l2-output") \
_(IPIW, "feature-bitmap-drop") \
_(FLOOD, "l2-flood") \
_(ARP_TERM, "arp-term-l2bd") \
_(UU_FLOOD, "l2-flood") \
_(FWD, "l2-fwd") \
_(LEARN, "l2-learn") \
_(VTR, "l2-input-vtr") \
_(VPATH, "vpath-input-l2") \
_(CTRL_PKT, "feature-bitmap-drop") \
_(L2PT, "feature-bitmap-drop") \
_(IGMP_SNOOP, "feature-bitmap-drop") \
_(MLD_SNOOP, "feature-bitmap-drop") \
_(DHCP_SNOOP, "feature-bitmap-drop") \
_(DAI, "feature-bitmap-drop") \
_(IPSG, "feature-bitmap-drop") \
_(ACL, "l2-input-acl") \
_(QOS, "feature-bitmap-drop") \
_(CFM, "feature-bitmap-drop") \
_(SPAN, "feature-bitmap-drop")
// Feature bitmap positions
typedef enum {
#define _(sym,str) L2INPUT_FEAT_##sym##_BIT,
foreach_l2input_feat
#undef _
L2INPUT_N_FEAT,
} l2input_feat_t;
// Feature bit masks
typedef enum {
#define _(sym,str) L2INPUT_FEAT_##sym = (1<<L2INPUT_FEAT_##sym##_BIT),
foreach_l2input_feat
#undef _
} l2input_feat_masks_t;
// 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
#define IP4_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \
L2INPUT_FEAT_MLD_SNOOP | \
L2INPUT_FEAT_L2PT | \
L2INPUT_FEAT_CFM | \
L2INPUT_FEAT_DAI)
#define IP6_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \
L2INPUT_FEAT_IGMP_SNOOP | \
L2INPUT_FEAT_L2PT | \
L2INPUT_FEAT_CFM | \
L2INPUT_FEAT_DAI)
#define IP_UDP_TCP_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \
L2INPUT_FEAT_L2PT | \
L2INPUT_FEAT_IGMP_SNOOP | \
L2INPUT_FEAT_MLD_SNOOP | \
L2INPUT_FEAT_DHCP_SNOOP | \
L2INPUT_FEAT_CFM | \
L2INPUT_FEAT_DAI)
#define MPLS_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \
L2INPUT_FEAT_L2PT | \
L2INPUT_FEAT_IGMP_SNOOP | \
L2INPUT_FEAT_MLD_SNOOP | \
L2INPUT_FEAT_DHCP_SNOOP | \
L2INPUT_FEAT_CFM | \
L2INPUT_FEAT_DAI)
// 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);
#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;
/* 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 ((ethertype == ETHERNET_TYPE_VLAN) ||
(ethertype == ETHERNET_TYPE_DOT1AD) ||
(ethertype == ETHERNET_TYPE_VLAN_9100) ||
(ethertype == ETHERNET_TYPE_VLAN_9200)) {
ethernet_vlan_header_t * vlan;
vnet_buffer(b)->l2.l2_len += sizeof (*vlan);
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);
}
}
}
/*
* 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
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