1 /**************************************************************************/
2 /* */
3 /* Copyright (c) Microsoft Corporation. All rights reserved. */
4 /* */
5 /* This software is licensed under the Microsoft Software License */
6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */
7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
8 /* and in the root directory of this software. */
9 /* */
10 /**************************************************************************/
11
12
13 /**************************************************************************/
14 /**************************************************************************/
15 /** */
16 /** NetX Component */
17 /** */
18 /** Internet Protocol (IP) */
19 /** */
20 /**************************************************************************/
21 /**************************************************************************/
22
23 #define NX_SOURCE_CODE
24
25
26
27 /* Include necessary system files. */
28
29 #include "nx_api.h"
30 #include "nx_ipv6.h"
31 #include "nx_icmpv6.h"
32
33 #ifdef FEATURE_NX_IPV6
34
35
36 /**************************************************************************/
37 /* */
38 /* FUNCTION RELEASE */
39 /* */
40 /* _nx_ipv6_process_routing_option PORTABLE C */
41 /* 6.1 */
42 /* AUTHOR */
43 /* */
44 /* Yuxin Zhou, Microsoft Corporation */
45 /* */
46 /* DESCRIPTION */
47 /* */
48 /* This function processes the Routing Option header. */
49 /* */
50 /* INPUT */
51 /* */
52 /* ip_ptr Pointer to IP control block */
53 /* packet_ptr Pointer to packet to process */
54 /* */
55 /* OUTPUT */
56 /* */
57 /* NX_SUCCESS Successful completion */
58 /* NX_OPTION_HEADER_ERROR Error parsing router option */
59 /* */
60 /* CALLS */
61 /* */
62 /* None */
63 /* */
64 /* CALLED BY */
65 /* */
66 /* _nx_ipv6_packet_receive */
67 /* */
68 /* RELEASE HISTORY */
69 /* */
70 /* DATE NAME DESCRIPTION */
71 /* */
72 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
73 /* 09-30-2020 Yuxin Zhou Modified comment(s), improved */
74 /* packet length verification, */
75 /* resulting in version 6.1 */
76 /* */
77 /**************************************************************************/
_nx_ipv6_process_routing_option(NX_IP * ip_ptr,NX_PACKET * packet_ptr)78 UINT _nx_ipv6_process_routing_option(NX_IP *ip_ptr, NX_PACKET *packet_ptr)
79 {
80
81 NX_IPV6_HEADER_ROUTING_OPTION *option;
82 #ifndef NX_DISABLE_ICMPV6_ERROR_MESSAGE
83 UINT base_offset;
84 #endif
85
86
87 /* Add debug information. */
88 NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
89
90 /* Check packet length is at least sizeof(NX_IPV6_HEADER_ROUTING_OPTION). */
91 if (packet_ptr -> nx_packet_length < sizeof(NX_IPV6_HEADER_ROUTING_OPTION))
92 {
93 return(NX_OPTION_HEADER_ERROR);
94 }
95
96 /* Set a pointer to the routing header. */
97 /*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
98 option = (NX_IPV6_HEADER_ROUTING_OPTION *)(packet_ptr -> nx_packet_prepend_ptr);
99
100 if (option -> nx_ipv6_header_routing_option_segments_left == 0)
101 {
102 /* Skip the rest of the routing header and continue processing this packet. */
103 return(NX_SUCCESS);
104 }
105
106 /* According to RFC 5095, Routing Header 0 (described in RFC 2460) has been
107 deprecated. Therefore discard the packet that has segments left, and send
108 an ICMP Parameter Problem if such feature is enabled. */
109
110 #ifndef NX_DISABLE_ICMPV6_ERROR_MESSAGE
111
112 /*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */
113 base_offset = (UINT)(packet_ptr -> nx_packet_prepend_ptr - packet_ptr -> nx_packet_ip_header);
114
115 /*lint -e{835} -e{845} suppress operating on zero. */
116 NX_ICMPV6_SEND_PARAMETER_PROBLEM(ip_ptr, packet_ptr, 0, base_offset + 2);
117 #else
118 NX_PARAMETER_NOT_USED(ip_ptr);
119 #endif
120
121 /* Return error status, so the caller knows to free the packet. */
122 return(NX_OPTION_HEADER_ERROR);
123 }
124
125
126 #endif /* FEATURE_NX_IPV6 */
127
128
