xref: /linux/include/linux/in.h (revision 52338415)
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * INET		An implementation of the TCP/IP protocol suite for the LINUX
4  *		operating system.  INET is implemented using the  BSD Socket
5  *		interface as the means of communication with the user level.
6  *
7  *		Definitions of the Internet Protocol.
8  *
9  * Version:	@(#)in.h	1.0.1	04/21/93
10  *
11  * Authors:	Original taken from the GNU Project <netinet/in.h> file.
12  *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
13  */
14 #ifndef _LINUX_IN_H
15 #define _LINUX_IN_H
16 
17 
18 #include <linux/errno.h>
19 #include <uapi/linux/in.h>
20 
21 static inline int proto_ports_offset(int proto)
22 {
23 	switch (proto) {
24 	case IPPROTO_TCP:
25 	case IPPROTO_UDP:
26 	case IPPROTO_DCCP:
27 	case IPPROTO_ESP:	/* SPI */
28 	case IPPROTO_SCTP:
29 	case IPPROTO_UDPLITE:
30 		return 0;
31 	case IPPROTO_AH:	/* SPI */
32 		return 4;
33 	default:
34 		return -EINVAL;
35 	}
36 }
37 
38 static inline bool ipv4_is_loopback(__be32 addr)
39 {
40 	return (addr & htonl(0xff000000)) == htonl(0x7f000000);
41 }
42 
43 static inline bool ipv4_is_multicast(__be32 addr)
44 {
45 	return (addr & htonl(0xf0000000)) == htonl(0xe0000000);
46 }
47 
48 static inline bool ipv4_is_local_multicast(__be32 addr)
49 {
50 	return (addr & htonl(0xffffff00)) == htonl(0xe0000000);
51 }
52 
53 static inline bool ipv4_is_lbcast(__be32 addr)
54 {
55 	/* limited broadcast */
56 	return addr == htonl(INADDR_BROADCAST);
57 }
58 
59 static inline bool ipv4_is_all_snoopers(__be32 addr)
60 {
61 	return addr == htonl(INADDR_ALLSNOOPERS_GROUP);
62 }
63 
64 static inline bool ipv4_is_zeronet(__be32 addr)
65 {
66 	return (addr == 0);
67 }
68 
69 /* Special-Use IPv4 Addresses (RFC3330) */
70 
71 static inline bool ipv4_is_private_10(__be32 addr)
72 {
73 	return (addr & htonl(0xff000000)) == htonl(0x0a000000);
74 }
75 
76 static inline bool ipv4_is_private_172(__be32 addr)
77 {
78 	return (addr & htonl(0xfff00000)) == htonl(0xac100000);
79 }
80 
81 static inline bool ipv4_is_private_192(__be32 addr)
82 {
83 	return (addr & htonl(0xffff0000)) == htonl(0xc0a80000);
84 }
85 
86 static inline bool ipv4_is_linklocal_169(__be32 addr)
87 {
88 	return (addr & htonl(0xffff0000)) == htonl(0xa9fe0000);
89 }
90 
91 static inline bool ipv4_is_anycast_6to4(__be32 addr)
92 {
93 	return (addr & htonl(0xffffff00)) == htonl(0xc0586300);
94 }
95 
96 static inline bool ipv4_is_test_192(__be32 addr)
97 {
98 	return (addr & htonl(0xffffff00)) == htonl(0xc0000200);
99 }
100 
101 static inline bool ipv4_is_test_198(__be32 addr)
102 {
103 	return (addr & htonl(0xfffe0000)) == htonl(0xc6120000);
104 }
105 #endif	/* _LINUX_IN_H */
106