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Vector Packet Processing
ip6_input.h
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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 #include <vnet/ip/icmp6.h>
45 
46 extern char *ip6_error_strings[];
47 
48 typedef enum
49 {
56 
57 always_inline void
59  vlib_node_runtime_t * error_node,
60  vlib_buffer_t * p0, vlib_buffer_t * p1,
61  ip6_header_t * ip0, ip6_header_t * ip1,
62  u32 * next0, u32 * next1)
63 {
64  u8 error0, error1;
65 
66  error0 = error1 = IP6_ERROR_NONE;
67 
68  /* Version != 6? Drop it. */
69  error0 =
70  (clib_net_to_host_u32
72  6 ? IP6_ERROR_VERSION : error0;
73  error1 =
74  (clib_net_to_host_u32
76  6 ? IP6_ERROR_VERSION : error1;
77 
78  /* hop limit < 1? Drop it. for link-local broadcast packets,
79  * like dhcpv6 packets from client has hop-limit 1, which should not
80  * be dropped.
81  */
82  error0 = ip0->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error0;
83  error1 = ip1->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error1;
84 
85  /* L2 length must be at least minimal IP header. */
86  error0 =
87  p0->current_length < sizeof (ip0[0]) ? IP6_ERROR_TOO_SHORT : error0;
88  error1 =
89  p1->current_length < sizeof (ip1[0]) ? IP6_ERROR_TOO_SHORT : error1;
90 
91  if (PREDICT_FALSE (error0 != IP6_ERROR_NONE))
92  {
93  if (error0 == IP6_ERROR_TIME_EXPIRED)
94  {
95  icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
96  ICMP6_time_exceeded_ttl_exceeded_in_transit,
97  0);
99  }
100  else
101  {
102  *next0 = IP6_INPUT_NEXT_DROP;
103  }
104  }
105  if (PREDICT_FALSE (error1 != IP6_ERROR_NONE))
106  {
107  if (error1 == IP6_ERROR_TIME_EXPIRED)
108  {
109  icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
110  ICMP6_time_exceeded_ttl_exceeded_in_transit,
111  0);
112  *next1 = IP6_INPUT_NEXT_ICMP_ERROR;
113  }
114  else
115  {
116  *next1 = IP6_INPUT_NEXT_DROP;
117  }
118  }
119 }
120 
121 always_inline void
123  vlib_node_runtime_t * error_node,
124  vlib_buffer_t * p0, ip6_header_t * ip0, u32 * next0)
125 {
126  u8 error0;
127 
128  error0 = IP6_ERROR_NONE;
129 
130  /* Version != 6? Drop it. */
131  error0 =
132  (clib_net_to_host_u32
134  6 ? IP6_ERROR_VERSION : error0;
135 
136  /* hop limit < 1? Drop it. for link-local broadcast packets,
137  * like dhcpv6 packets from client has hop-limit 1, which should not
138  * be dropped.
139  */
140  error0 = ip0->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error0;
141 
142  /* L2 length must be at least minimal IP header. */
143  error0 =
144  p0->current_length < sizeof (ip0[0]) ? IP6_ERROR_TOO_SHORT : error0;
145 
146  if (PREDICT_FALSE (error0 != IP6_ERROR_NONE))
147  {
148  if (error0 == IP6_ERROR_TIME_EXPIRED)
149  {
150  icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
151  ICMP6_time_exceeded_ttl_exceeded_in_transit,
152  0);
153  *next0 = IP6_INPUT_NEXT_ICMP_ERROR;
154  }
155  else
156  {
157  *next0 = IP6_INPUT_NEXT_DROP;
158  }
159  }
160 }
161 
162 #endif
163 
164 /*
165  * fd.io coding-style-patch-verification: ON
166  *
167  * Local Variables:
168  * eval: (c-set-style "gnu")
169  * End:
170  */
char * ip6_error_strings[]
Definition: ip6_input.c:222
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:113
unsigned char u8
Definition: types.h:56
unsigned int u32
Definition: types.h:88
void icmp6_error_set_vnet_buffer(vlib_buffer_t *b, u8 type, u8 code, u32 data)
Definition: icmp6.c:446
#define PREDICT_FALSE(x)
Definition: clib.h:118
#define always_inline
Definition: ipsec.h:28
vlib_main_t * vm
Definition: in2out_ed.c:1599
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:58
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:122
ip6_input_next_t
Definition: ip6_input.h:48
u32 ip_version_traffic_class_and_flow_label
Definition: ip6_packet.h:297
VLIB buffer representation.
Definition: buffer.h:102