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Vector Packet Processing
interface_output.h
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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>
45 
49  udp_header_t * uh)
50 {
51  if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM)
52  ip4->checksum = ip4_header_checksum (ip4);
53  if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM)
54  {
55  th->checksum = 0;
56  th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip4);
57  }
58  if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
59  {
60  uh->checksum = 0;
61  uh->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip4);
62  }
63 }
64 
68  udp_header_t * uh)
69 {
70  int bogus;
71  if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM)
72  {
73  th->checksum = 0;
74  th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus);
75  }
76  if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
77  {
78  uh->checksum = 0;
79  uh->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus);
80  }
81 }
82 
85  int is_ip4, int is_ip6, int with_gso)
86 {
89  tcp_header_t *th;
90  udp_header_t *uh;
91 
92  if (with_gso)
93  {
94  generic_header_offset_t gho = { 0 };
95  vnet_generic_header_offset_parser (b, &gho, 1 /* l2 */ , is_ip4,
96  is_ip6);
97 
98  ASSERT (gho.gho_flags ^ (GHO_F_IP4 | GHO_F_IP6));
99 
100  vnet_get_inner_header (b, &gho);
101 
102  ip4 = (ip4_header_t *)
104  ip6 = (ip6_header_t *)
108 
109  if (gho.gho_flags & GHO_F_IP4)
110  {
111  vnet_calc_ip4_checksums (vm, b, ip4, th, uh);
112  }
113  else if (gho.gho_flags & GHO_F_IP6)
114  {
115  vnet_calc_ip6_checksums (vm, b, ip6, th, uh);
116  }
117 
118  vnet_get_outer_header (b, &gho);
119  }
120  else
121  {
122  ASSERT (!(is_ip4 && is_ip6));
123 
124  ip4 = (ip4_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
125  ip6 = (ip6_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
126  th = (tcp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
127  uh = (udp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
128 
129  if (is_ip4)
130  {
131  vnet_calc_ip4_checksums (vm, b, ip4, th, uh);
132  }
133  if (is_ip6)
134  {
135  vnet_calc_ip6_checksums (vm, b, ip6, th, uh);
136  }
137  }
138  b->flags &= ~VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
139  b->flags &= ~VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
140  b->flags &= ~VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
141 }
142 
143 #endif
144 
145 /*
146  * fd.io coding-style-patch-verification: ON
147  *
148  * Local Variables:
149  * eval: (c-set-style "gnu")
150  * End:
151  */
static_always_inline void vnet_get_outer_header(vlib_buffer_t *b0, generic_header_offset_t *gho)
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
static_always_inline void vnet_calc_ip6_checksums(vlib_main_t *vm, vlib_buffer_t *b, ip6_header_t *ip6, tcp_header_t *th, udp_header_t *uh)
static_always_inline void vnet_get_inner_header(vlib_buffer_t *b0, generic_header_offset_t *gho)
struct _tcp_header tcp_header_t
#define static_always_inline
Definition: clib.h:106
vl_api_ip6_address_t ip6
Definition: one.api:424
bool is_ip6
Definition: ip.api:43
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:229
vl_api_ip4_address_t ip4
Definition: one.api:376
vlib_main_t * vm
Definition: in2out_ed.c:1599
u8 data[]
Packet data.
Definition: buffer.h:181
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:1095
#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:1367
static_always_inline void vnet_generic_header_offset_parser(vlib_buffer_t *b0, generic_header_offset_t *gho, int is_l2, int is_ip4, int is_ip6)
VLIB buffer representation.
Definition: buffer.h:102
static_always_inline void vnet_calc_ip4_checksums(vlib_main_t *vm, vlib_buffer_t *b, ip4_header_t *ip4, tcp_header_t *th, udp_header_t *uh)
#define vnet_buffer(b)
Definition: buffer.h:417
static_always_inline void vnet_calc_checksums_inline(vlib_main_t *vm, vlib_buffer_t *b, int is_ip4, int is_ip6, int with_gso)
static u16 ip4_header_checksum(ip4_header_t *i)
Definition: ip4_packet.h:247