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Vector Packet Processing
l2_bvi.h
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1 /*
2  * l2_bvi.h : layer 2 Bridged Virtual Interface
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_l2bvi_h
19 #define included_l2bvi_h
20 
21 #include <vlib/vlib.h>
22 #include <vnet/ethernet/ethernet.h>
23 #include <vppinfra/sparse_vec.h>
24 
25 #include <vnet/l2/l2_input.h>
26 
27 #define TO_BVI_ERR_OK 0
28 #define TO_BVI_ERR_BAD_MAC 1
29 #define TO_BVI_ERR_ETHERTYPE 2
30 
31 /**
32  * Send a packet from L2 processing to L3 via the BVI interface.
33  * Set next0 to the proper L3 input node.
34  * Return an error if the packet isn't what we expect.
35  */
36 
40  vlib_buffer_t * b0,
41  u32 bvi_sw_if_index, next_by_ethertype_t * l3_next, u32 * next0)
42 {
43  u8 l2_len;
44  u16 ethertype;
45  u8 *l3h;
48 
49  e0 = vlib_buffer_get_current (b0);
50  hi = vnet_get_sup_hw_interface (vnet_main, bvi_sw_if_index);
51 
52  /* Perform L3 my-mac filter */
53  if ((!ethernet_address_cast (e0->dst_address)) &&
54  (!eth_mac_equal ((u8 *) e0, hi->hw_address)))
55  {
56  return TO_BVI_ERR_BAD_MAC;
57  }
58 
59  /* Save L2 header position which may be changed due to packet replication */
60  vnet_buffer (b0)->ethernet.start_of_ethernet_header = b0->current_data;
61 
62  /* Strip L2 header */
63  l2_len = vnet_buffer (b0)->l2.l2_len;
64  vlib_buffer_advance (b0, l2_len);
65 
66  l3h = vlib_buffer_get_current (b0);
67  ethertype = clib_net_to_host_u16 (*(u16 *) (l3h - 2));
68 
69  /* Set the input interface to be the BVI interface */
70  vnet_buffer (b0)->sw_if_index[VLIB_RX] = bvi_sw_if_index;
71  vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
72 
73  /* Go to appropriate L3 input node */
74  if (ethertype == ETHERNET_TYPE_IP4)
75  {
76  *next0 = l3_next->input_next_ip4;
77  }
78  else if (ethertype == ETHERNET_TYPE_IP6)
79  {
80  *next0 = l3_next->input_next_ip6;
81  }
82  else
83  {
84  /* uncommon ethertype, check table */
85  u32 i0;
86 
87  i0 = sparse_vec_index (l3_next->input_next_by_type, ethertype);
88  *next0 = vec_elt (l3_next->input_next_by_type, i0);
89 
90  if (i0 == SPARSE_VEC_INVALID_INDEX)
91  {
92  return TO_BVI_ERR_ETHERTYPE;
93  }
94  }
95 
96  /* increment BVI RX interface stat */
100  vlib_main->cpu_index,
101  vnet_buffer (b0)->sw_if_index[VLIB_RX],
102  1, vlib_buffer_length_in_chain (vlib_main, b0));
103  return TO_BVI_ERR_OK;
104 }
105 
106 void
108  ethernet_type_t type, u32 node_index);
109 #endif
110 
111 /*
112  * fd.io coding-style-patch-verification: ON
113  *
114  * Local Variables:
115  * eval: (c-set-style "gnu")
116  * End:
117  */
vmrglw vmrglh hi
void l2bvi_register_input_type(vlib_main_t *vm, ethernet_type_t type, u32 node_index)
Definition: l2_bvi.c:27
#define TO_BVI_ERR_BAD_MAC
Definition: l2_bvi.h:28
static vnet_hw_interface_t * vnet_get_sup_hw_interface(vnet_main_t *vnm, u32 sw_if_index)
vnet_interface_main_t interface_main
Definition: vnet.h:57
ethernet_type_t
Definition: packet.h:43
#define TO_BVI_ERR_ETHERTYPE
Definition: l2_bvi.h:29
static_always_inline u32 l2_to_bvi(vlib_main_t *vlib_main, vnet_main_t *vnet_main, vlib_buffer_t *b0, u32 bvi_sw_if_index, next_by_ethertype_t *l3_next, u32 *next0)
Send a packet from L2 processing to L3 via the BVI interface.
Definition: l2_bvi.h:38
static uword vlib_buffer_length_in_chain(vlib_main_t *vm, vlib_buffer_t *b)
Get length in bytes of the buffer chain.
Definition: buffer_funcs.h:100
i16 current_data
signed offset in data[], pre_data[] that we are currently processing.
Definition: buffer.h:67
#define static_always_inline
Definition: clib.h:85
static uword ethernet_address_cast(u8 *a)
Definition: packet.h:65
vlib_combined_counter_main_t * combined_sw_if_counters
Definition: interface.h:626
u8 dst_address[6]
Definition: packet.h:53
u32 cpu_index
Definition: main.h:159
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:188
vnet_main_t vnet_main
Definition: misc.c:43
static uword sparse_vec_index(void *v, uword sparse_index)
Definition: sparse_vec.h:152
int vlib_main(vlib_main_t *volatile vm, unformat_input_t *input)
Definition: main.c:1654
unsigned int u32
Definition: types.h:88
static void vlib_increment_combined_counter(vlib_combined_counter_main_t *cm, u32 cpu_index, u32 index, u64 n_packets, u64 n_bytes)
Increment a combined counter.
Definition: counter.h:211
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:201
#define vec_elt(v, i)
Get vector value at index i.
Definition: defs.h:47
unsigned short u16
Definition: types.h:57
unsigned char u8
Definition: types.h:56
#define vnet_buffer(b)
Definition: buffer.h:294
static u32 eth_mac_equal(u8 *mac1, u8 *mac2)
Definition: ethernet.h:519
#define TO_BVI_ERR_OK
Definition: l2_bvi.h:27
Definition: defs.h:46
u16 * input_next_by_type
Definition: ethernet.h:219
#define SPARSE_VEC_INVALID_INDEX
Definition: sparse_vec.h:68