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