FD.io VPP  v18.01.2-1-g9b554f3
Vector Packet Processing
ip6_input.h
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2017 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  * ip/ip6_input.c: IP v6 input 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 included_ip6_input_h
41 #define included_ip6_input_h
42 
43 #include <vnet/ip/ip.h>
44 
45 extern char *ip6_error_strings[];
46 
47 typedef enum
48 {
55 
56 always_inline void
58  vlib_node_runtime_t * error_node,
59  vlib_buffer_t * p0, vlib_buffer_t * p1,
60  ip6_header_t * ip0, ip6_header_t * ip1,
61  u32 * next0, u32 * next1)
62 {
63  u8 error0, error1;
64 
65  error0 = error1 = IP6_ERROR_NONE;
66 
67  /* Version != 6? Drop it. */
68  error0 =
69  (clib_net_to_host_u32
71  6 ? IP6_ERROR_VERSION : error0;
72  error1 =
73  (clib_net_to_host_u32
75  6 ? IP6_ERROR_VERSION : error1;
76 
77  /* hop limit < 1? Drop it. for link-local broadcast packets,
78  * like dhcpv6 packets from client has hop-limit 1, which should not
79  * be dropped.
80  */
81  error0 = ip0->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error0;
82  error1 = ip1->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error1;
83 
84  /* L2 length must be at least minimal IP header. */
85  error0 =
86  p0->current_length < sizeof (ip0[0]) ? IP6_ERROR_TOO_SHORT : error0;
87  error1 =
88  p1->current_length < sizeof (ip1[0]) ? IP6_ERROR_TOO_SHORT : error1;
89 
90  if (PREDICT_FALSE (error0 != IP6_ERROR_NONE))
91  {
92  if (error0 == IP6_ERROR_TIME_EXPIRED)
93  {
94  icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
95  ICMP6_time_exceeded_ttl_exceeded_in_transit,
96  0);
98  }
99  else
100  {
101  *next0 = IP6_INPUT_NEXT_DROP;
102  }
103  }
104  if (PREDICT_FALSE (error1 != IP6_ERROR_NONE))
105  {
106  if (error1 == IP6_ERROR_TIME_EXPIRED)
107  {
108  icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
109  ICMP6_time_exceeded_ttl_exceeded_in_transit,
110  0);
111  *next1 = IP6_INPUT_NEXT_ICMP_ERROR;
112  }
113  else
114  {
115  *next1 = IP6_INPUT_NEXT_DROP;
116  }
117  }
118 }
119 
120 always_inline void
122  vlib_node_runtime_t * error_node,
123  vlib_buffer_t * p0, ip6_header_t * ip0, u32 * next0)
124 {
125  u8 error0;
126 
127  error0 = IP6_ERROR_NONE;
128 
129  /* Version != 6? Drop it. */
130  error0 =
131  (clib_net_to_host_u32
133  6 ? IP6_ERROR_VERSION : error0;
134 
135  /* hop limit < 1? Drop it. for link-local broadcast packets,
136  * like dhcpv6 packets from client has hop-limit 1, which should not
137  * be dropped.
138  */
139  error0 = ip0->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error0;
140 
141  /* L2 length must be at least minimal IP header. */
142  error0 =
143  p0->current_length < sizeof (ip0[0]) ? IP6_ERROR_TOO_SHORT : error0;
144 
145  if (PREDICT_FALSE (error0 != IP6_ERROR_NONE))
146  {
147  if (error0 == IP6_ERROR_TIME_EXPIRED)
148  {
149  icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
150  ICMP6_time_exceeded_ttl_exceeded_in_transit,
151  0);
152  *next0 = IP6_INPUT_NEXT_ICMP_ERROR;
153  }
154  else
155  {
156  *next0 = IP6_INPUT_NEXT_DROP;
157  }
158  }
159 }
160 
161 #endif
162 
163 /*
164  * fd.io coding-style-patch-verification: ON
165  *
166  * Local Variables:
167  * eval: (c-set-style "gnu")
168  * End:
169  */
char * ip6_error_strings[]
Definition: ip6_input.c:221
#define always_inline
Definition: clib.h:92
void icmp6_error_set_vnet_buffer(vlib_buffer_t *b, u8 type, u8 code, u32 data)
Definition: icmp6.c:509
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:72
#define PREDICT_FALSE(x)
Definition: clib.h:105
static void ip6_input_check_x2(vlib_main_t *vm, vlib_node_runtime_t *error_node, vlib_buffer_t *p0, vlib_buffer_t *p1, ip6_header_t *ip0, ip6_header_t *ip1, u32 *next0, u32 *next1)
Definition: ip6_input.h:57
vlib_main_t * vm
Definition: buffer.c:283
static void ip6_input_check_x1(vlib_main_t *vm, vlib_node_runtime_t *error_node, vlib_buffer_t *p0, ip6_header_t *ip0, u32 *next0)
Definition: ip6_input.h:121
unsigned int u32
Definition: types.h:88
ip6_input_next_t
Definition: ip6_input.h:47
u32 ip_version_traffic_class_and_flow_label
Definition: ip6_packet.h:328
unsigned char u8
Definition: types.h:56