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 /* Include necessary system files. */
27
28 #include "nx_api.h"
29 #include "nx_ip.h"
30 #include "nx_packet.h"
31
32
33
34 /**************************************************************************/
35 /* */
36 /* FUNCTION RELEASE */
37 /* */
38 /* _nx_ip_fragment_disable PORTABLE C */
39 /* 6.1 */
40 /* AUTHOR */
41 /* */
42 /* Yuxin Zhou, Microsoft Corporation */
43 /* */
44 /* DESCRIPTION */
45 /* */
46 /* This function disables IP fragment assembly processing and releases */
47 /* all partial fragments being assembled. */
48 /* */
49 /* INPUT */
50 /* */
51 /* ip_ptr Pointer to IP instance */
52 /* */
53 /* OUTPUT */
54 /* */
55 /* status Completion status */
56 /* */
57 /* CALLS */
58 /* */
59 /* _nx_packet_release Release packet */
60 /* tx_mutex_get Get protection mutex */
61 /* tx_mutex_put Put protection mutex */
62 /* */
63 /* CALLED BY */
64 /* */
65 /* Application */
66 /* */
67 /* RELEASE HISTORY */
68 /* */
69 /* DATE NAME DESCRIPTION */
70 /* */
71 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
72 /* 09-30-2020 Yuxin Zhou Modified comment(s), */
73 /* resulting in version 6.1 */
74 /* */
75 /**************************************************************************/
_nx_ip_fragment_disable(NX_IP * ip_ptr)76 UINT _nx_ip_fragment_disable(NX_IP *ip_ptr)
77 {
78 #ifndef NX_DISABLE_FRAGMENTATION
79 TX_INTERRUPT_SAVE_AREA
80
81 #ifndef NX_FRAGMENT_IMMEDIATE_ASSEMBLY
82 NX_PACKET *new_fragment_head;
83 #endif /* NX_FRAGMENT_IMMEDIATE_ASSEMBLY */
84 NX_PACKET *assemble_head;
85 NX_PACKET *next_packet;
86 NX_PACKET *release_packet;
87
88
89 /* If trace is enabled, insert this event into the trace buffer. */
90 NX_TRACE_IN_LINE_INSERT(NX_TRACE_IP_FRAGMENT_DISABLE, ip_ptr, 0, 0, 0, NX_TRACE_IP_EVENTS, 0, 0);
91
92 /* Get mutex protection. */
93 tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
94
95 /* Disable interrupts temporarily. */
96 TX_DISABLE
97
98 /* Clear the IP fragment processing routine pointer. */
99 ip_ptr -> nx_ip_fragment_processing = NX_NULL;
100
101 /* Clear the IP fragment assembly routine pointer. */
102 ip_ptr -> nx_ip_fragment_assembly = NX_NULL;
103
104 /* Clear the IP fragment timeout routine pointer. */
105 ip_ptr -> nx_ip_fragment_timeout_check = NX_NULL;
106
107 /* Pickup the fragment list pointer. */
108 #ifndef NX_FRAGMENT_IMMEDIATE_ASSEMBLY
109 new_fragment_head = ip_ptr -> nx_ip_received_fragment_head;
110 #else
111 NX_ASSERT(ip_ptr -> nx_ip_received_fragment_head == NX_NULL);
112 #endif /* NX_FRAGMENT_IMMEDIATE_ASSEMBLY */
113 assemble_head = ip_ptr -> nx_ip_fragment_assembly_head;
114
115 /* Clear the IP structure lists. */
116 ip_ptr -> nx_ip_received_fragment_head = NX_NULL;
117 ip_ptr -> nx_ip_received_fragment_tail = NX_NULL;
118 ip_ptr -> nx_ip_fragment_assembly_head = NX_NULL;
119 ip_ptr -> nx_ip_fragment_assembly_tail = NX_NULL;
120
121 /* Restore interrupts. */
122 TX_RESTORE
123
124 /* Release mutex protection. */
125 tx_mutex_put(&(ip_ptr -> nx_ip_protection));
126
127 #ifndef NX_FRAGMENT_IMMEDIATE_ASSEMBLY
128 /* Now walk through the receive and assembly lists to free the packets. */
129 next_packet = new_fragment_head;
130 while (next_packet)
131 {
132
133 /* Set the release packet to this packet. */
134 release_packet = next_packet;
135
136 /* Move next packet to the next in the list. */
137 next_packet = next_packet -> nx_packet_queue_next;
138
139 /* Release the current packet. */
140 _nx_packet_release(release_packet);
141 }
142 #endif /* NX_FRAGMENT_IMMEDIATE_ASSEMBLY */
143
144 /* Now walk through the assemble list and release all packets. */
145 while (assemble_head)
146 {
147
148 /* Walk through the list of packets being assembled for this packet and release them. */
149 next_packet = assemble_head;
150 assemble_head = next_packet -> nx_packet_queue_next;
151 while (next_packet)
152 {
153
154 /* Set the release packet to this packet. */
155 release_packet = next_packet;
156
157 /* Move next packet to the next in the list. */
158 next_packet = next_packet -> nx_packet_union_next.nx_packet_fragment_next;
159
160 /* Reset tcp_queue_next before releasing. */
161 /*lint -e{923} suppress cast of ULONG to pointer. */
162 release_packet -> nx_packet_union_next.nx_packet_tcp_queue_next = (NX_PACKET *)NX_PACKET_ALLOCATED;
163
164 /* Release the current packet. */
165 _nx_packet_release(release_packet);
166 }
167 }
168
169 /* Return success to the caller. */
170 return(NX_SUCCESS);
171 #else /* NX_DISABLE_FRAGMENTATION */
172 NX_PARAMETER_NOT_USED(ip_ptr);
173
174 return(NX_NOT_ENABLED);
175
176 #endif /* NX_DISABLE_FRAGMENTATION */
177 }
178
179
