1: /*
2: * BIRD Internet Routing Daemon -- The Internet Protocol
3: *
4: * (c) 1998 Martin Mares <mj@ucw.cz>
5: *
6: * Can be freely distributed and used under the terms of the GNU GPL.
7: */
8:
9: #ifndef _BIRD_IP_H_
10: #define _BIRD_IP_H_
11:
12: #include "lib/endian.h"
13: #include "lib/string.h"
14: #include "lib/bitops.h"
15: #include "lib/unaligned.h"
16:
17:
18: #define IP4_ALL_NODES ipa_build4(224, 0, 0, 1)
19: #define IP4_ALL_ROUTERS ipa_build4(224, 0, 0, 2)
20: #define IP4_OSPF_ALL_ROUTERS ipa_build4(224, 0, 0, 5)
21: #define IP4_OSPF_DES_ROUTERS ipa_build4(224, 0, 0, 6)
22: #define IP4_RIP_ROUTERS ipa_build4(224, 0, 0, 9)
23:
24: #define IP6_ALL_NODES ipa_build6(0xFF020000, 0, 0, 1)
25: #define IP6_ALL_ROUTERS ipa_build6(0xFF020000, 0, 0, 2)
26: #define IP6_OSPF_ALL_ROUTERS ipa_build6(0xFF020000, 0, 0, 5)
27: #define IP6_OSPF_DES_ROUTERS ipa_build6(0xFF020000, 0, 0, 6)
28: #define IP6_RIP_ROUTERS ipa_build6(0xFF020000, 0, 0, 9)
29: #define IP6_BABEL_ROUTERS ipa_build6(0xFF020000, 0, 0, 0x00010006)
30:
31: #define IP4_NONE _MI4(0)
32: #define IP6_NONE _MI6(0,0,0,0)
33:
34: #define IP4_MIN_MTU 576
35: #define IP6_MIN_MTU 1280
36:
37: #define IP_PREC_INTERNET_CONTROL 0xc0
38:
39: #define IP4_HEADER_LENGTH 20
40: #define IP6_HEADER_LENGTH 40
41: #define UDP_HEADER_LENGTH 8
42:
43:
44: #ifdef IPV6
45: #define MAX_PREFIX_LENGTH 128
46: #define BITS_PER_IP_ADDRESS 128
47: #define STD_ADDRESS_P_LENGTH 39
48: #define SIZE_OF_IP_HEADER 40
49: #else
50: #define MAX_PREFIX_LENGTH 32
51: #define BITS_PER_IP_ADDRESS 32
52: #define STD_ADDRESS_P_LENGTH 15
53: #define SIZE_OF_IP_HEADER 24
54: #endif
55:
56:
57: #ifdef DEBUGGING
58:
59: typedef struct ip4_addr {
60: u32 addr;
61: } ip4_addr;
62:
63: #define _MI4(x) ((struct ip4_addr) { x })
64: #define _I(x) (x).addr
65:
66: #else
67:
68: typedef u32 ip4_addr;
69:
70: #define _MI4(x) (x)
71: #define _I(x) (x)
72:
73: #endif
74:
75:
76: typedef struct ip6_addr {
77: u32 addr[4];
78: } ip6_addr;
79:
80: #define _MI6(a,b,c,d) ((struct ip6_addr) {{ a, b, c, d }})
81: #define _I0(a) ((a).addr[0])
82: #define _I1(a) ((a).addr[1])
83: #define _I2(a) ((a).addr[2])
84: #define _I3(a) ((a).addr[3])
85:
86:
87: #ifdef IPV6
88:
89: /* Structure ip_addr may contain both IPv4 and IPv6 addresses */
90: typedef ip6_addr ip_addr;
91: #define IPA_NONE IP6_NONE
92:
93: #define ipa_from_ip4(x) _MI6(0,0,0xffff,_I(x))
94: #define ipa_from_ip6(x) x
95: #define ipa_from_u32(x) ipa_from_ip4(ip4_from_u32(x))
96:
97: #define ipa_to_ip4(x) _MI4(_I3(x))
98: #define ipa_to_ip6(x) x
99: #define ipa_to_u32(x) ip4_to_u32(ipa_to_ip4(x))
100:
101: #define ipa_is_ip4(a) ip6_is_v4mapped(a)
102:
103: #else
104:
105: /* Provisionary ip_addr definition same as ip4_addr */
106: typedef ip4_addr ip_addr;
107: #define IPA_NONE IP4_NONE
108:
109: #define ipa_from_ip4(x) x
110: #define ipa_from_ip6(x) IPA_NONE
111: #define ipa_from_u32(x) ipa_from_ip4(ip4_from_u32(x))
112:
113: #define ipa_to_ip4(x) x
114: #define ipa_to_ip6(x) IP6_NONE
115: #define ipa_to_u32(x) ip4_to_u32(ipa_to_ip4(x))
116:
117: #define ipa_is_ip4(a) 1
118:
119: #endif
120:
121:
122: /*
123: * Public constructors
124: */
125:
126: #define ip4_from_u32(x) _MI4(x)
127: #define ip4_to_u32(x) _I(x)
128:
129: #define ip4_build(a,b,c,d) _MI4(((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
130: #define ip6_build(a,b,c,d) _MI6(a,b,c,d)
131:
132: #define ipa_build4(a,b,c,d) ipa_from_ip4(ip4_build(a,b,c,d))
133: #define ipa_build6(a,b,c,d) ipa_from_ip6(ip6_build(a,b,c,d))
134:
135:
136: /*
137: * Basic algebraic functions
138: */
139:
140: static inline int ip4_equal(ip4_addr a, ip4_addr b)
141: { return _I(a) == _I(b); }
142:
143: static inline int ip4_zero(ip4_addr a)
144: { return _I(a) == 0; }
145:
146: static inline int ip4_nonzero(ip4_addr a)
147: { return _I(a) != 0; }
148:
149: static inline ip4_addr ip4_and(ip4_addr a, ip4_addr b)
150: { return _MI4(_I(a) & _I(b)); }
151:
152: static inline ip4_addr ip4_or(ip4_addr a, ip4_addr b)
153: { return _MI4(_I(a) | _I(b)); }
154:
155: static inline ip4_addr ip4_xor(ip4_addr a, ip4_addr b)
156: { return _MI4(_I(a) ^ _I(b)); }
157:
158: static inline ip4_addr ip4_not(ip4_addr a)
159: { return _MI4(~_I(a)); }
160:
161:
162: static inline int ip6_equal(ip6_addr a, ip6_addr b)
163: { return _I0(a) == _I0(b) && _I1(a) == _I1(b) && _I2(a) == _I2(b) && _I3(a) == _I3(b); }
164:
165: static inline int ip6_zero(ip6_addr a)
166: { return !_I0(a) && !_I1(a) && !_I2(a) && !_I3(a); }
167:
168: static inline int ip6_nonzero(ip6_addr a)
169: { return _I0(a) || _I1(a) || _I2(a) || _I3(a); }
170:
171: static inline ip6_addr ip6_and(ip6_addr a, ip6_addr b)
172: { return _MI6(_I0(a) & _I0(b), _I1(a) & _I1(b), _I2(a) & _I2(b), _I3(a) & _I3(b)); }
173:
174: static inline ip6_addr ip6_or(ip6_addr a, ip6_addr b)
175: { return _MI6(_I0(a) | _I0(b), _I1(a) | _I1(b), _I2(a) | _I2(b), _I3(a) | _I3(b)); }
176:
177: static inline ip6_addr ip6_xor(ip6_addr a, ip6_addr b)
178: { return _MI6(_I0(a) ^ _I0(b), _I1(a) ^ _I1(b), _I2(a) ^ _I2(b), _I3(a) ^ _I3(b)); }
179:
180: static inline ip6_addr ip6_not(ip6_addr a)
181: { return _MI6(~_I0(a), ~_I1(a), ~_I2(a), ~_I3(a)); }
182:
183:
184: #ifdef IPV6
185: #define ipa_equal(x,y) ip6_equal(x,y)
186: #define ipa_zero(x) ip6_zero(x)
187: #define ipa_nonzero(x) ip6_nonzero(x)
188: #define ipa_and(x,y) ip6_and(x,y)
189: #define ipa_or(x,y) ip6_or(x,y)
190: #define ipa_xor(x,y) ip6_xor(x,y)
191: #define ipa_not(x) ip6_not(x)
192: #else
193: #define ipa_equal(x,y) ip4_equal(x,y)
194: #define ipa_zero(x) ip4_zero(x)
195: #define ipa_nonzero(x) ip4_nonzero(x)
196: #define ipa_and(x,y) ip4_and(x,y)
197: #define ipa_or(x,y) ip4_or(x,y)
198: #define ipa_xor(x,y) ip4_xor(x,y)
199: #define ipa_not(x) ip4_not(x)
200: #endif
201:
202:
203:
204: #ifdef IPV6
205: /*
206: * A zero address is either a token for invalid/unused, or the prefix of default
207: * routes. These functions should be used in the second case, where both IPv4
208: * and IPv6 zero addresses should be checked.
209: */
210:
211: static inline int ipa_zero2(ip_addr a)
212: { return !_I0(a) && !_I1(a) && ((_I2(a) == 0) || (_I2(a) == 0xffff)) && !_I3(a); }
213:
214: static inline int ipa_nonzero2(ip_addr a)
215: { return _I0(a) || _I1(a) || ((_I2(a) != 0) && (_I2(a) != 0xffff)) || _I3(a); }
216:
217: #else
218: #define ipa_zero2(x) ip4_zero(x)
219: #define ipa_nonzero2(x) ip4_nonzero(x)
220: #endif
221:
222:
223: /*
224: * Hash and compare functions
225: */
226:
227: static inline uint ip4_hash(ip4_addr a)
228: {
229: /* Returns a 16-bit value */
230: u32 x = _I(a);
231: x ^= x >> 16;
232: x ^= x << 10;
233: return x & 0xffff;
234: }
235:
236: static inline u32 ip4_hash32(ip4_addr a)
237: {
238: /* Returns a 32-bit value, although low-order bits are not mixed */
239: u32 x = _I(a);
240: x ^= x << 16;
241: x ^= x << 12;
242: return x;
243: }
244:
245: static inline uint ip6_hash(ip6_addr a)
246: {
247: /* Returns a 16-bit hash key */
248: u32 x = _I0(a) ^ _I1(a) ^ _I2(a) ^ _I3(a);
249: return (x ^ (x >> 16) ^ (x >> 8)) & 0xffff;
250: }
251:
252: static inline u32 ip6_hash32(ip6_addr a)
253: {
254: /* Returns a 32-bit hash key, although low-order bits are not mixed */
255: u32 x = _I0(a) ^ _I1(a) ^ _I2(a) ^ _I3(a);
256: return x ^ (x << 16) ^ (x << 24);
257: }
258:
259: static inline int ip4_compare(ip4_addr a, ip4_addr b)
260: { return (_I(a) > _I(b)) - (_I(a) < _I(b)); }
261:
262: int ip6_compare(ip6_addr a, ip6_addr b);
263:
264:
265: #ifdef IPV6
266: #define ipa_hash(x) ip6_hash(x)
267: #define ipa_hash32(x) ip6_hash32(x)
268: #define ipa_compare(x,y) ip6_compare(x,y)
269: #else
270: #define ipa_hash(x) ip4_hash(x)
271: #define ipa_hash32(x) ip4_hash32(x)
272: #define ipa_compare(x,y) ip4_compare(x,y)
273: #endif
274:
275:
276: /*
277: * IP address classification
278: */
279:
280: /* Address class */
281: #define IADDR_INVALID -1
282: #define IADDR_SCOPE_MASK 0xfff
283: #define IADDR_HOST 0x1000
284: #define IADDR_BROADCAST 0x2000
285: #define IADDR_MULTICAST 0x4000
286:
287: /* Address scope */
288: #define SCOPE_HOST 0
289: #define SCOPE_LINK 1
290: #define SCOPE_SITE 2
291: #define SCOPE_ORGANIZATION 3
292: #define SCOPE_UNIVERSE 4
293: #define SCOPE_UNDEFINED 5
294:
295: int ip4_classify(ip4_addr ad);
296: int ip6_classify(ip6_addr *a);
297:
298: static inline int ip6_is_link_local(ip6_addr a)
299: { return (_I0(a) & 0xffc00000) == 0xfe800000; }
300:
301: static inline int ip6_is_v4mapped(ip6_addr a)
302: { return _I0(a) == 0 && _I1(a) == 0 && _I2(a) == 0xffff; }
303:
304: #ifdef IPV6
305: #define ipa_classify(x) ip6_classify(&(x))
306: #define ipa_is_link_local(x) ip6_is_link_local(x)
307: #else
308: #define ipa_classify(x) ip4_classify(x)
309: #define ipa_is_link_local(x) 0
310: #endif
311:
312: static inline int ipa_classify_net(ip_addr a)
313: { return ipa_zero2(a) ? (IADDR_HOST | SCOPE_UNIVERSE) : ipa_classify(a); }
314:
315:
316: /*
317: * Miscellaneous IP prefix manipulation
318: */
319:
320: static inline ip4_addr ip4_mkmask(uint n)
321: { return _MI4(u32_mkmask(n)); }
322:
323: static inline int ip4_masklen(ip4_addr a)
324: { return u32_masklen(_I(a)); }
325:
326: ip6_addr ip6_mkmask(uint n);
327: int ip6_masklen(ip6_addr *a);
328:
329: /* ipX_pxlen() requires that x != y */
330: static inline uint ip4_pxlen(ip4_addr a, ip4_addr b)
331: { return 31 - u32_log2(_I(a) ^ _I(b)); }
332:
333: static inline uint ip6_pxlen(ip6_addr a, ip6_addr b)
334: {
335: int i = 0;
336: i += (a.addr[i] == b.addr[i]);
337: i += (a.addr[i] == b.addr[i]);
338: i += (a.addr[i] == b.addr[i]);
339: i += (a.addr[i] == b.addr[i]);
340: return 32 * i + 31 - u32_log2(a.addr[i] ^ b.addr[i]);
341: }
342:
343: static inline u32 ip4_getbit(ip4_addr a, uint pos)
344: { return _I(a) & (0x80000000 >> pos); }
345:
346: static inline u32 ip6_getbit(ip6_addr a, uint pos)
347: { return a.addr[pos / 32] & (0x80000000 >> (pos % 32)); }
348:
349: static inline ip4_addr ip4_opposite_m1(ip4_addr a)
350: { return _MI4(_I(a) ^ 1); }
351:
352: static inline ip4_addr ip4_opposite_m2(ip4_addr a)
353: { return _MI4(_I(a) ^ 3); }
354:
355: static inline ip6_addr ip6_opposite_m1(ip6_addr a)
356: { return _MI6(_I0(a), _I1(a), _I2(a), _I3(a) ^ 1); }
357:
358: static inline ip6_addr ip6_opposite_m2(ip6_addr a)
359: { return _MI6(_I0(a), _I1(a), _I2(a), _I3(a) ^ 3); }
360:
361: ip4_addr ip4_class_mask(ip4_addr ad);
362:
363: #ifdef IPV6
364: #define ipa_mkmask(x) ip6_mkmask(x)
365: #define ipa_masklen(x) ip6_masklen(&x)
366: #define ipa_pxlen(x,y) ip6_pxlen(x,y)
367: #define ipa_getbit(x,n) ip6_getbit(x,n)
368: #define ipa_opposite_m1(x) ip6_opposite_m1(x)
369: #define ipa_opposite_m2(x) ip6_opposite_m2(x)
370: #else
371: #define ipa_mkmask(x) ip4_mkmask(x)
372: #define ipa_masklen(x) ip4_masklen(x)
373: #define ipa_pxlen(x,y) ip4_pxlen(x,y)
374: #define ipa_getbit(x,n) ip4_getbit(x,n)
375: #define ipa_opposite_m1(x) ip4_opposite_m1(x)
376: #define ipa_opposite_m2(x) ip4_opposite_m2(x)
377: #endif
378:
379:
380: /*
381: * Host/network order conversions
382: */
383:
384: static inline ip4_addr ip4_hton(ip4_addr a)
385: { return _MI4(htonl(_I(a))); }
386:
387: static inline ip4_addr ip4_ntoh(ip4_addr a)
388: { return _MI4(ntohl(_I(a))); }
389:
390: static inline ip6_addr ip6_hton(ip6_addr a)
391: { return _MI6(htonl(_I0(a)), htonl(_I1(a)), htonl(_I2(a)), htonl(_I3(a))); }
392:
393: static inline ip6_addr ip6_ntoh(ip6_addr a)
394: { return _MI6(ntohl(_I0(a)), ntohl(_I1(a)), ntohl(_I2(a)), ntohl(_I3(a))); }
395:
396: #ifdef IPV6
397: #define ipa_hton(x) x = ip6_hton(x)
398: #define ipa_ntoh(x) x = ip6_ntoh(x)
399: #else
400: #define ipa_hton(x) x = ip4_hton(x)
401: #define ipa_ntoh(x) x = ip4_ntoh(x)
402: #endif
403:
404:
405: /*
406: * Unaligned data access (in network order)
407: */
408:
409: static inline ip4_addr get_ip4(void *buf)
410: {
411: return _MI4(get_u32(buf));
412: }
413:
414: static inline ip6_addr get_ip6(void *buf)
415: {
416: ip6_addr a;
417: memcpy(&a, buf, 16);
418: return ip6_ntoh(a);
419: }
420:
421: static inline void * put_ip4(void *buf, ip4_addr a)
422: {
423: put_u32(buf, _I(a));
424: return buf+4;
425: }
426:
427: static inline void * put_ip6(void *buf, ip6_addr a)
428: {
429: a = ip6_hton(a);
430: memcpy(buf, &a, 16);
431: return buf+16;
432: }
433:
434: // XXXX these functions must be redesigned or removed
435: #ifdef IPV6
436: #define get_ipa(x) get_ip6(x)
437: #define put_ipa(x,y) put_ip6(x,y)
438: #else
439: #define get_ipa(x) get_ip4(x)
440: #define put_ipa(x,y) put_ip4(x,y)
441: #endif
442:
443:
444: /*
445: * Binary/text form conversions
446: */
447:
448: char *ip4_ntop(ip4_addr a, char *b);
449: char *ip6_ntop(ip6_addr a, char *b);
450:
451: static inline char * ip4_ntox(ip4_addr a, char *b)
452: { return b + bsprintf(b, "%08x", _I(a)); }
453:
454: static inline char * ip6_ntox(ip6_addr a, char *b)
455: { return b + bsprintf(b, "%08x.%08x.%08x.%08x", _I0(a), _I1(a), _I2(a), _I3(a)); }
456:
457: int ip4_pton(const char *a, ip4_addr *o);
458: int ip6_pton(const char *a, ip6_addr *o);
459:
460: // XXXX these functions must be redesigned or removed
461: #ifdef IPV6
462: #define ipa_ntop(x,y) ip6_ntop(x,y)
463: #define ipa_ntox(x,y) ip6_ntox(x,y)
464: #define ipa_pton(x,y) ip6_pton(x,y)
465: #else
466: #define ipa_ntop(x,y) ip4_ntop(x,y)
467: #define ipa_ntox(x,y) ip4_ntox(x,y)
468: #define ipa_pton(x,y) ip4_pton(x,y)
469: #endif
470:
471:
472: /*
473: * Miscellaneous
474: */
475:
476: // XXXX review this
477:
478: #define ip_is_prefix(a,l) (!ipa_nonzero(ipa_and(a, ipa_not(ipa_mkmask(l)))))
479: #define ipa_in_net(x,n,p) (ipa_zero(ipa_and(ipa_xor((n),(x)),ipa_mkmask(p))))
480: #define net_in_net(n1,l1,n2,l2) (((l1) >= (l2)) && (ipa_zero(ipa_and(ipa_xor((n1),(n2)),ipa_mkmask(l2)))))
481:
482: char *ip_scope_text(uint);
483:
484: struct prefix {
485: ip_addr addr;
486: uint len;
487: };
488:
489:
490: #endif
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