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 Group Management Protocol (IGMP) */
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_igmp.h"
30
31
32 #ifndef NX_DISABLE_IPV4
33 /**************************************************************************/
34 /* */
35 /* FUNCTION RELEASE */
36 /* */
37 /* _nx_igmp_multicast_check PORTABLE C */
38 /* 6.1 */
39 /* AUTHOR */
40 /* */
41 /* Yuxin Zhou, Microsoft Corporation */
42 /* */
43 /* DESCRIPTION */
44 /* */
45 /* This function checks the list of joined multicast addresses to see */
46 /* if the incoming address matches. If the specified group is */
47 /* "all hosts" or if a match is found, NX_TRUE is returned to the */
48 /* caller. */
49 /* */
50 /* INPUT */
51 /* */
52 /* ip_ptr IP instance pointer */
53 /* group Multicast group IP address */
54 /* nx_interface Pointer to interface */
55 /* */
56 /* OUTPUT */
57 /* */
58 /* NX_TRUE If a match is found */
59 /* NX_FALSE Otherwise */
60 /* */
61 /* CALLS */
62 /* */
63 /* None */
64 /* */
65 /* CALLED BY */
66 /* */
67 /* _nx_ipv4_packet_receive Raw IP packet receive */
68 /* */
69 /* RELEASE HISTORY */
70 /* */
71 /* DATE NAME DESCRIPTION */
72 /* */
73 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
74 /* 09-30-2020 Yuxin Zhou Modified comment(s), */
75 /* resulting in version 6.1 */
76 /* */
77 /**************************************************************************/
_nx_igmp_multicast_check(NX_IP * ip_ptr,ULONG group,NX_INTERFACE * nx_interface)78 UINT _nx_igmp_multicast_check(NX_IP *ip_ptr, ULONG group, NX_INTERFACE *nx_interface)
79 {
80
81 UINT i;
82
83 /* Check for "all hosts" group. We always assume all hosts membership. */
84 /*lint -e{835} -e{845} suppress operating on zero. */
85 if (group == NX_ALL_HOSTS_ADDRESS)
86 {
87 return(NX_TRUE);
88 }
89
90 /* Loop through the IP multicast join list to find the matching group that is being
91 responded to by another host on this same network. */
92
93 for (i = 0; i < NX_MAX_MULTICAST_GROUPS; i++)
94 {
95
96 /* Check for a match. */
97 if ((ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_list == group) &&
98 (nx_interface == ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_interface_list))
99 {
100 return(NX_TRUE);
101 }
102 }
103
104 /* Otherwise, we have searched the entire list, return false. */
105 return(NX_FALSE);
106 }
107 #endif /* !NX_DISABLE_IPV4 */
108
109
