FD.io VPP  v19.04.1-1-ge4a0f9f
Vector Packet Processing
interface_output.h
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2015 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  * interface_output.c: interface output node
17  *
18  * Copyright (c) 2008 Eliot Dresselhaus
19  *
20  * Permission is hereby granted, free of charge, to any person obtaining
21  * a copy of this software and associated documentation files (the
22  * "Software"), to deal in the Software without restriction, including
23  * without limitation the rights to use, copy, modify, merge, publish,
24  * distribute, sublicense, and/or sell copies of the Software, and to
25  * permit persons to whom the Software is furnished to do so, subject to
26  * the following conditions:
27  *
28  * The above copyright notice and this permission notice shall be
29  * included in all copies or substantial portions of the Software.
30  *
31  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38  */
39 
40 #ifndef __INTERFACE_INLINES_H__
41 #define __INTERFACE_INLINES_H__
42 
43 #include <vnet/vnet.h>
44 
47 {
48  ip4_header_t *ip4;
49  ip6_header_t *ip6;
50  tcp_header_t *th;
51  udp_header_t *uh;
52 
53  int is_ip4 = (b->flags & VNET_BUFFER_F_IS_IP4) != 0;
54  int is_ip6 = (b->flags & VNET_BUFFER_F_IS_IP6) != 0;
55 
56  ASSERT (!(is_ip4 && is_ip6));
57 
58  ip4 = (ip4_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
59  ip6 = (ip6_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
60  th = (tcp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
61  uh = (udp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
62 
63  if (is_ip4)
64  {
65  ip4 = (ip4_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
66  if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM)
67  ip4->checksum = ip4_header_checksum (ip4);
68  if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM)
69  {
70  th->checksum = 0;
71  th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip4);
72  }
73  if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
74  uh->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip4);
75  }
76  if (is_ip6)
77  {
78  int bogus;
79  if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM)
80  {
81  th->checksum = 0;
82  th->checksum =
83  ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus);
84  }
85  if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
86  {
87  uh->checksum = 0;
88  uh->checksum =
89  ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus);
90  }
91  }
92 
93  b->flags &= ~VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
94  b->flags &= ~VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
95  b->flags &= ~VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
96 }
97 
98 #endif
99 
100 /*
101  * fd.io coding-style-patch-verification: ON
102  *
103  * Local Variables:
104  * eval: (c-set-style "gnu")
105  * End:
106  */
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:124
u8 data[0]
Packet data.
Definition: buffer.h:181
struct _tcp_header tcp_header_t
#define static_always_inline
Definition: clib.h:99
vlib_main_t * vm
Definition: buffer.c:312
u16 ip6_tcp_udp_icmp_compute_checksum(vlib_main_t *vm, vlib_buffer_t *p0, ip6_header_t *ip0, int *bogus_lengthp)
Definition: ip6_forward.c:947
#define ASSERT(truth)
u16 ip4_tcp_udp_compute_checksum(vlib_main_t *vm, vlib_buffer_t *p0, ip4_header_t *ip0)
Definition: ip4_forward.c:1128
static_always_inline void calc_checksums(vlib_main_t *vm, vlib_buffer_t *b)
VLIB buffer representation.
Definition: buffer.h:102
#define vnet_buffer(b)
Definition: buffer.h:369
static u16 ip4_header_checksum(ip4_header_t *i)
Definition: ip4_packet.h:247