1 /*
2  * INET		An implementation of the TCP/IP protocol suite for the LINUX
3  *		operating system.  INET is implemented using the  BSD Socket
4  *		interface as the means of communication with the user level.
5  *
6  *		Definitions of the Internet Protocol.
7  *
8  * Version:	@(#)in.h	1.0.1	04/21/93
9  *
10  * Authors:	Original taken from the GNU Project <netinet/in.h> file.
11  *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12  *
13  *		This program is free software; you can redistribute it and/or
14  *		modify it under the terms of the GNU General Public License
15  *		as published by the Free Software Foundation; either version
16  *		2 of the License, or (at your option) any later version.
17  */
18 #ifndef _LINUX_IN_H
19 #define _LINUX_IN_H
20 
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 
24 /* Standard well-defined IP protocols.  */
25 enum {
26   IPPROTO_IP = 0,		/* Dummy protocol for TCP		*/
27   IPPROTO_ICMP = 1,		/* Internet Control Message Protocol	*/
28   IPPROTO_IGMP = 2,		/* Internet Group Management Protocol	*/
29   IPPROTO_IPIP = 4,		/* IPIP tunnels (older KA9Q tunnels use 94) */
30   IPPROTO_TCP = 6,		/* Transmission Control Protocol	*/
31   IPPROTO_EGP = 8,		/* Exterior Gateway Protocol		*/
32   IPPROTO_PUP = 12,		/* PUP protocol				*/
33   IPPROTO_UDP = 17,		/* User Datagram Protocol		*/
34   IPPROTO_IDP = 22,		/* XNS IDP protocol			*/
35   IPPROTO_DCCP = 33,		/* Datagram Congestion Control Protocol */
36   IPPROTO_RSVP = 46,		/* RSVP protocol			*/
37   IPPROTO_GRE = 47,		/* Cisco GRE tunnels (rfc 1701,1702)	*/
38 
39   IPPROTO_IPV6	 = 41,		/* IPv6-in-IPv4 tunnelling		*/
40 
41   IPPROTO_ESP = 50,            /* Encapsulation Security Payload protocol */
42   IPPROTO_AH = 51,             /* Authentication Header protocol       */
43   IPPROTO_BEETPH = 94,	       /* IP option pseudo header for BEET */
44   IPPROTO_PIM    = 103,		/* Protocol Independent Multicast	*/
45 
46   IPPROTO_COMP   = 108,                /* Compression Header protocol */
47   IPPROTO_SCTP   = 132,		/* Stream Control Transport Protocol	*/
48   IPPROTO_UDPLITE = 136,	/* UDP-Lite (RFC 3828)			*/
49 
50   IPPROTO_RAW	 = 255,		/* Raw IP packets			*/
51   IPPROTO_MAX
52 };
53 
54 
55 /* Internet address. */
56 struct in_addr {
57 	__be32	s_addr;
58 };
59 
60 #define IP_TOS		1
61 #define IP_TTL		2
62 #define IP_HDRINCL	3
63 #define IP_OPTIONS	4
64 #define IP_ROUTER_ALERT	5
65 #define IP_RECVOPTS	6
66 #define IP_RETOPTS	7
67 #define IP_PKTINFO	8
68 #define IP_PKTOPTIONS	9
69 #define IP_MTU_DISCOVER	10
70 #define IP_RECVERR	11
71 #define IP_RECVTTL	12
72 #define	IP_RECVTOS	13
73 #define IP_MTU		14
74 #define IP_FREEBIND	15
75 #define IP_IPSEC_POLICY	16
76 #define IP_XFRM_POLICY	17
77 #define IP_PASSSEC	18
78 #define IP_TRANSPARENT	19
79 
80 /* BSD compatibility */
81 #define IP_RECVRETOPTS	IP_RETOPTS
82 
83 /* TProxy original addresses */
84 #define IP_ORIGDSTADDR       20
85 #define IP_RECVORIGDSTADDR   IP_ORIGDSTADDR
86 
87 #define IP_MINTTL       21
88 #define IP_NODEFRAG     22
89 
90 /* IP_MTU_DISCOVER values */
91 #define IP_PMTUDISC_DONT		0	/* Never send DF frames */
92 #define IP_PMTUDISC_WANT		1	/* Use per route hints	*/
93 #define IP_PMTUDISC_DO			2	/* Always DF		*/
94 #define IP_PMTUDISC_PROBE		3       /* Ignore dst pmtu      */
95 
96 #define IP_MULTICAST_IF			32
97 #define IP_MULTICAST_TTL 		33
98 #define IP_MULTICAST_LOOP 		34
99 #define IP_ADD_MEMBERSHIP		35
100 #define IP_DROP_MEMBERSHIP		36
101 #define IP_UNBLOCK_SOURCE		37
102 #define IP_BLOCK_SOURCE			38
103 #define IP_ADD_SOURCE_MEMBERSHIP	39
104 #define IP_DROP_SOURCE_MEMBERSHIP	40
105 #define IP_MSFILTER			41
106 #define MCAST_JOIN_GROUP		42
107 #define MCAST_BLOCK_SOURCE		43
108 #define MCAST_UNBLOCK_SOURCE		44
109 #define MCAST_LEAVE_GROUP		45
110 #define MCAST_JOIN_SOURCE_GROUP		46
111 #define MCAST_LEAVE_SOURCE_GROUP	47
112 #define MCAST_MSFILTER			48
113 #define IP_MULTICAST_ALL		49
114 #define IP_UNICAST_IF			50
115 
116 #define MCAST_EXCLUDE	0
117 #define MCAST_INCLUDE	1
118 
119 /* These need to appear somewhere around here */
120 #define IP_DEFAULT_MULTICAST_TTL        1
121 #define IP_DEFAULT_MULTICAST_LOOP       1
122 
123 /* Request struct for multicast socket ops */
124 
125 struct ip_mreq  {
126 	struct in_addr imr_multiaddr;	/* IP multicast address of group */
127 	struct in_addr imr_interface;	/* local IP address of interface */
128 };
129 
130 struct ip_mreqn {
131 	struct in_addr	imr_multiaddr;		/* IP multicast address of group */
132 	struct in_addr	imr_address;		/* local IP address of interface */
133 	int		imr_ifindex;		/* Interface index */
134 };
135 
136 struct ip_mreq_source {
137 	__be32		imr_multiaddr;
138 	__be32		imr_interface;
139 	__be32		imr_sourceaddr;
140 };
141 
142 struct ip_msfilter {
143 	__be32		imsf_multiaddr;
144 	__be32		imsf_interface;
145 	__u32		imsf_fmode;
146 	__u32		imsf_numsrc;
147 	__be32		imsf_slist[1];
148 };
149 
150 #define IP_MSFILTER_SIZE(numsrc) \
151 	(sizeof(struct ip_msfilter) - sizeof(__u32) \
152 	+ (numsrc) * sizeof(__u32))
153 
154 struct group_req {
155 	__u32				 gr_interface;	/* interface index */
156 	struct __kernel_sockaddr_storage gr_group;	/* group address */
157 };
158 
159 struct group_source_req {
160 	__u32				 gsr_interface;	/* interface index */
161 	struct __kernel_sockaddr_storage gsr_group;	/* group address */
162 	struct __kernel_sockaddr_storage gsr_source;	/* source address */
163 };
164 
165 struct group_filter {
166 	__u32				 gf_interface;	/* interface index */
167 	struct __kernel_sockaddr_storage gf_group;	/* multicast address */
168 	__u32				 gf_fmode;	/* filter mode */
169 	__u32				 gf_numsrc;	/* number of sources */
170 	struct __kernel_sockaddr_storage gf_slist[1];	/* interface index */
171 };
172 
173 #define GROUP_FILTER_SIZE(numsrc) \
174 	(sizeof(struct group_filter) - sizeof(struct __kernel_sockaddr_storage) \
175 	+ (numsrc) * sizeof(struct __kernel_sockaddr_storage))
176 
177 struct in_pktinfo {
178 	int		ipi_ifindex;
179 	struct in_addr	ipi_spec_dst;
180 	struct in_addr	ipi_addr;
181 };
182 
183 /* Structure describing an Internet (IP) socket address. */
184 #define __SOCK_SIZE__	16		/* sizeof(struct sockaddr)	*/
185 struct sockaddr_in {
186   __kernel_sa_family_t	sin_family;	/* Address family		*/
187   __be16		sin_port;	/* Port number			*/
188   struct in_addr	sin_addr;	/* Internet address		*/
189 
190   /* Pad to size of `struct sockaddr'. */
191   unsigned char		__pad[__SOCK_SIZE__ - sizeof(short int) -
192 			sizeof(unsigned short int) - sizeof(struct in_addr)];
193 };
194 #define sin_zero	__pad		/* for BSD UNIX comp. -FvK	*/
195 
196 
197 /*
198  * Definitions of the bits in an Internet address integer.
199  * On subnets, host and network parts are found according
200  * to the subnet mask, not these masks.
201  */
202 #define	IN_CLASSA(a)		((((long int) (a)) & 0x80000000) == 0)
203 #define	IN_CLASSA_NET		0xff000000
204 #define	IN_CLASSA_NSHIFT	24
205 #define	IN_CLASSA_HOST		(0xffffffff & ~IN_CLASSA_NET)
206 #define	IN_CLASSA_MAX		128
207 
208 #define	IN_CLASSB(a)		((((long int) (a)) & 0xc0000000) == 0x80000000)
209 #define	IN_CLASSB_NET		0xffff0000
210 #define	IN_CLASSB_NSHIFT	16
211 #define	IN_CLASSB_HOST		(0xffffffff & ~IN_CLASSB_NET)
212 #define	IN_CLASSB_MAX		65536
213 
214 #define	IN_CLASSC(a)		((((long int) (a)) & 0xe0000000) == 0xc0000000)
215 #define	IN_CLASSC_NET		0xffffff00
216 #define	IN_CLASSC_NSHIFT	8
217 #define	IN_CLASSC_HOST		(0xffffffff & ~IN_CLASSC_NET)
218 
219 #define	IN_CLASSD(a)		((((long int) (a)) & 0xf0000000) == 0xe0000000)
220 #define	IN_MULTICAST(a)		IN_CLASSD(a)
221 #define IN_MULTICAST_NET	0xF0000000
222 
223 #define	IN_EXPERIMENTAL(a)	((((long int) (a)) & 0xf0000000) == 0xf0000000)
224 #define	IN_BADCLASS(a)		IN_EXPERIMENTAL((a))
225 
226 /* Address to accept any incoming messages. */
227 #define	INADDR_ANY		((unsigned long int) 0x00000000)
228 
229 /* Address to send to all hosts. */
230 #define	INADDR_BROADCAST	((unsigned long int) 0xffffffff)
231 
232 /* Address indicating an error return. */
233 #define	INADDR_NONE		((unsigned long int) 0xffffffff)
234 
235 /* Network number for local host loopback. */
236 #define	IN_LOOPBACKNET		127
237 
238 /* Address to loopback in software to local host.  */
239 #define	INADDR_LOOPBACK		0x7f000001	/* 127.0.0.1   */
240 #define	IN_LOOPBACK(a)		((((long int) (a)) & 0xff000000) == 0x7f000000)
241 
242 /* Defines for Multicast INADDR */
243 #define INADDR_UNSPEC_GROUP   	0xe0000000U	/* 224.0.0.0   */
244 #define INADDR_ALLHOSTS_GROUP 	0xe0000001U	/* 224.0.0.1   */
245 #define INADDR_ALLRTRS_GROUP    0xe0000002U	/* 224.0.0.2 */
246 #define INADDR_MAX_LOCAL_GROUP  0xe00000ffU	/* 224.0.0.255 */
247 
248 
249 /* <asm/byteorder.h> contains the htonl type stuff.. */
250 #include <asm/byteorder.h>
251 
252 #ifdef __KERNEL__
253 
254 #include <linux/errno.h>
255 
proto_ports_offset(int proto)256 static inline int proto_ports_offset(int proto)
257 {
258 	switch (proto) {
259 	case IPPROTO_TCP:
260 	case IPPROTO_UDP:
261 	case IPPROTO_DCCP:
262 	case IPPROTO_ESP:	/* SPI */
263 	case IPPROTO_SCTP:
264 	case IPPROTO_UDPLITE:
265 		return 0;
266 	case IPPROTO_AH:	/* SPI */
267 		return 4;
268 	default:
269 		return -EINVAL;
270 	}
271 }
272 
ipv4_is_loopback(__be32 addr)273 static inline bool ipv4_is_loopback(__be32 addr)
274 {
275 	return (addr & htonl(0xff000000)) == htonl(0x7f000000);
276 }
277 
ipv4_is_multicast(__be32 addr)278 static inline bool ipv4_is_multicast(__be32 addr)
279 {
280 	return (addr & htonl(0xf0000000)) == htonl(0xe0000000);
281 }
282 
ipv4_is_local_multicast(__be32 addr)283 static inline bool ipv4_is_local_multicast(__be32 addr)
284 {
285 	return (addr & htonl(0xffffff00)) == htonl(0xe0000000);
286 }
287 
ipv4_is_lbcast(__be32 addr)288 static inline bool ipv4_is_lbcast(__be32 addr)
289 {
290 	/* limited broadcast */
291 	return addr == htonl(INADDR_BROADCAST);
292 }
293 
ipv4_is_zeronet(__be32 addr)294 static inline bool ipv4_is_zeronet(__be32 addr)
295 {
296 	return (addr & htonl(0xff000000)) == htonl(0x00000000);
297 }
298 
299 /* Special-Use IPv4 Addresses (RFC3330) */
300 
ipv4_is_private_10(__be32 addr)301 static inline bool ipv4_is_private_10(__be32 addr)
302 {
303 	return (addr & htonl(0xff000000)) == htonl(0x0a000000);
304 }
305 
ipv4_is_private_172(__be32 addr)306 static inline bool ipv4_is_private_172(__be32 addr)
307 {
308 	return (addr & htonl(0xfff00000)) == htonl(0xac100000);
309 }
310 
ipv4_is_private_192(__be32 addr)311 static inline bool ipv4_is_private_192(__be32 addr)
312 {
313 	return (addr & htonl(0xffff0000)) == htonl(0xc0a80000);
314 }
315 
ipv4_is_linklocal_169(__be32 addr)316 static inline bool ipv4_is_linklocal_169(__be32 addr)
317 {
318 	return (addr & htonl(0xffff0000)) == htonl(0xa9fe0000);
319 }
320 
ipv4_is_anycast_6to4(__be32 addr)321 static inline bool ipv4_is_anycast_6to4(__be32 addr)
322 {
323 	return (addr & htonl(0xffffff00)) == htonl(0xc0586300);
324 }
325 
ipv4_is_test_192(__be32 addr)326 static inline bool ipv4_is_test_192(__be32 addr)
327 {
328 	return (addr & htonl(0xffffff00)) == htonl(0xc0000200);
329 }
330 
ipv4_is_test_198(__be32 addr)331 static inline bool ipv4_is_test_198(__be32 addr)
332 {
333 	return (addr & htonl(0xfffe0000)) == htonl(0xc6120000);
334 }
335 #endif
336 
337 #endif	/* _LINUX_IN_H */
338