Annotation of embedaddon/bird2/lib/ip.h, revision 1.1.1.1
1.1 misho 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 "sysdep/unix/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_MAX_PREFIX_LENGTH 32
35: #define IP6_MAX_PREFIX_LENGTH 128
36:
37: #define IP4_MAX_TEXT_LENGTH 15 /* "255.255.255.255" */
38: #define IP6_MAX_TEXT_LENGTH 39 /* "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff" */
39: #define IPA_MAX_TEXT_LENGTH 39
40:
41: #define IP4_MIN_MTU 576
42: #define IP6_MIN_MTU 1280
43:
44: #define IP_PREC_INTERNET_CONTROL 0xc0
45:
46: #define IP4_HEADER_LENGTH 20
47: #define IP6_HEADER_LENGTH 40
48: #define UDP_HEADER_LENGTH 8
49:
50:
51: #ifdef DEBUGGING
52:
53: typedef struct ip4_addr {
54: u32 addr;
55: } ip4_addr;
56:
57: #define _MI4(x) ((struct ip4_addr) { x })
58: #define _I(x) (x).addr
59:
60: #else
61:
62: typedef u32 ip4_addr;
63:
64: #define _MI4(x) ((u32) (x))
65: #define _I(x) (x)
66:
67: #endif
68:
69:
70: typedef struct ip6_addr {
71: u32 addr[4];
72: } ip6_addr;
73:
74: #define _MI6(a,b,c,d) ((struct ip6_addr) {{ a, b, c, d }})
75: #define _I0(a) ((a).addr[0])
76: #define _I1(a) ((a).addr[1])
77: #define _I2(a) ((a).addr[2])
78: #define _I3(a) ((a).addr[3])
79:
80:
81: /* Structure ip_addr may contain both IPv4 and IPv6 addresses */
82: typedef ip6_addr ip_addr;
83: #define IPA_NONE IP6_NONE
84:
85: #define ipa_from_ip4(x) _MI6(0,0,0xffff,_I(x))
86: #define ipa_from_ip6(x) x
87: #define ipa_from_u32(x) ipa_from_ip4(ip4_from_u32(x))
88:
89: #define ipa_to_ip4(x) _MI4(_I3(x))
90: #define ipa_to_ip6(x) x
91: #define ipa_to_u32(x) ip4_to_u32(ipa_to_ip4(x))
92:
93: #define ipa_is_ip4(a) ip6_is_v4mapped(a)
94: #define ipa_is_ip6(a) (! ip6_is_v4mapped(a))
95:
96: #define IPA_NONE4 ipa_from_ip4(IP4_NONE)
97: #define IPA_NONE6 ipa_from_ip6(IP6_NONE)
98:
99:
100: /*
101: * Public constructors
102: */
103:
104: #define ip4_from_u32(x) _MI4(x)
105: #define ip4_to_u32(x) _I(x)
106:
107: #define ip4_build(a,b,c,d) _MI4(((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
108: #define ip6_build(a,b,c,d) _MI6(a,b,c,d)
109:
110: #define ipa_build4(a,b,c,d) ipa_from_ip4(ip4_build(a,b,c,d))
111: #define ipa_build6(a,b,c,d) ipa_from_ip6(ip6_build(a,b,c,d))
112:
113:
114: /*
115: * Basic algebraic functions
116: */
117:
118: static inline int ip4_equal(ip4_addr a, ip4_addr b)
119: { return _I(a) == _I(b); }
120:
121: static inline int ip4_zero(ip4_addr a)
122: { return _I(a) == 0; }
123:
124: static inline int ip4_nonzero(ip4_addr a)
125: { return _I(a) != 0; }
126:
127: static inline ip4_addr ip4_and(ip4_addr a, ip4_addr b)
128: { return _MI4(_I(a) & _I(b)); }
129:
130: static inline ip4_addr ip4_or(ip4_addr a, ip4_addr b)
131: { return _MI4(_I(a) | _I(b)); }
132:
133: static inline ip4_addr ip4_xor(ip4_addr a, ip4_addr b)
134: { return _MI4(_I(a) ^ _I(b)); }
135:
136: static inline ip4_addr ip4_not(ip4_addr a)
137: { return _MI4(~_I(a)); }
138:
139:
140: static inline int ip6_equal(ip6_addr a, ip6_addr b)
141: { return _I0(a) == _I0(b) && _I1(a) == _I1(b) && _I2(a) == _I2(b) && _I3(a) == _I3(b); }
142:
143: static inline int ip6_zero(ip6_addr a)
144: { return !_I0(a) && !_I1(a) && !_I2(a) && !_I3(a); }
145:
146: static inline int ip6_nonzero(ip6_addr a)
147: { return _I0(a) || _I1(a) || _I2(a) || _I3(a); }
148:
149: static inline ip6_addr ip6_and(ip6_addr a, ip6_addr b)
150: { return _MI6(_I0(a) & _I0(b), _I1(a) & _I1(b), _I2(a) & _I2(b), _I3(a) & _I3(b)); }
151:
152: static inline ip6_addr ip6_or(ip6_addr a, ip6_addr b)
153: { return _MI6(_I0(a) | _I0(b), _I1(a) | _I1(b), _I2(a) | _I2(b), _I3(a) | _I3(b)); }
154:
155: static inline ip6_addr ip6_xor(ip6_addr a, ip6_addr b)
156: { return _MI6(_I0(a) ^ _I0(b), _I1(a) ^ _I1(b), _I2(a) ^ _I2(b), _I3(a) ^ _I3(b)); }
157:
158: static inline ip6_addr ip6_not(ip6_addr a)
159: { return _MI6(~_I0(a), ~_I1(a), ~_I2(a), ~_I3(a)); }
160:
161:
162: #define ipa_equal(x,y) ip6_equal(x,y)
163: #define ipa_zero(x) ip6_zero(x)
164: #define ipa_nonzero(x) ip6_nonzero(x)
165: #define ipa_and(x,y) ip6_and(x,y)
166: #define ipa_or(x,y) ip6_or(x,y)
167: #define ipa_xor(x,y) ip6_xor(x,y)
168: #define ipa_not(x) ip6_not(x)
169:
170:
171: /*
172: * A zero address is either a token for invalid/unused, or the prefix of default
173: * routes. These functions should be used in the second case, where both IPv4
174: * and IPv6 zero addresses should be checked.
175: */
176:
177: static inline int ipa_zero2(ip_addr a)
178: { return !_I0(a) && !_I1(a) && ((_I2(a) == 0) || (_I2(a) == 0xffff)) && !_I3(a); }
179:
180: static inline int ipa_nonzero2(ip_addr a)
181: { return _I0(a) || _I1(a) || ((_I2(a) != 0) && (_I2(a) != 0xffff)) || _I3(a); }
182:
183:
184: /*
185: * Hash and compare functions
186: */
187:
188: static inline u32 ip4_hash(ip4_addr a)
189: { return u32_hash(_I(a)); }
190:
191: static inline u32 ip6_hash(ip6_addr a)
192: {
193: /* Returns a 32-bit hash key, although low-order bits are not mixed */
194: u32 x = _I0(a) ^ _I1(a) ^ _I2(a) ^ _I3(a);
195: return x ^ (x << 16) ^ (x << 24);
196: }
197:
198: static inline int ip4_compare(ip4_addr a, ip4_addr b)
199: { return (_I(a) > _I(b)) - (_I(a) < _I(b)); }
200:
201: int ip6_compare(ip6_addr a, ip6_addr b);
202:
203: #define ipa_hash(x) ip6_hash(x)
204: #define ipa_compare(x,y) ip6_compare(x,y)
205:
206:
207: /*
208: * IP address classification
209: */
210:
211: /* Address class */
212: #define IADDR_INVALID -1
213: #define IADDR_SCOPE_MASK 0xfff
214: #define IADDR_HOST 0x1000
215: #define IADDR_BROADCAST 0x2000
216: #define IADDR_MULTICAST 0x4000
217:
218: /* Address scope */
219: #define SCOPE_HOST 0
220: #define SCOPE_LINK 1
221: #define SCOPE_SITE 2
222: #define SCOPE_ORGANIZATION 3
223: #define SCOPE_UNIVERSE 4
224: #define SCOPE_UNDEFINED 5
225:
226: int ip4_classify(ip4_addr ad);
227: int ip6_classify(ip6_addr *a);
228:
229: static inline int ip6_is_link_local(ip6_addr a)
230: { return (_I0(a) & 0xffc00000) == 0xfe800000; }
231:
232: static inline int ip6_is_v4mapped(ip6_addr a)
233: { return _I0(a) == 0 && _I1(a) == 0 && _I2(a) == 0xffff; }
234:
235: #define ipa_classify(x) ip6_classify(&(x))
236: #define ipa_is_link_local(x) ip6_is_link_local(x)
237:
238: static inline int ip4_is_unicast(ip4_addr a)
239: { return _I(a) < 0xe0000000; }
240:
241: /* XXXX remove */
242: static inline int ipa_classify_net(ip_addr a)
243: { return ipa_zero2(a) ? (IADDR_HOST | SCOPE_UNIVERSE) : ipa_classify(a); }
244:
245:
246: /*
247: * Miscellaneous IP prefix manipulation
248: */
249:
250: static inline ip4_addr ip4_mkmask(uint n)
251: { return _MI4(u32_mkmask(n)); }
252:
253: static inline uint ip4_masklen(ip4_addr a)
254: { return u32_masklen(_I(a)); }
255:
256: ip6_addr ip6_mkmask(uint n);
257: uint ip6_masklen(ip6_addr *a);
258:
259: /* ipX_pxlen() requires that x != y */
260: static inline uint ip4_pxlen(ip4_addr a, ip4_addr b)
261: { return 31 - u32_log2(_I(a) ^ _I(b)); }
262:
263: static inline uint ip6_pxlen(ip6_addr a, ip6_addr b)
264: {
265: int i = 0;
266: i += (a.addr[i] == b.addr[i]);
267: i += (a.addr[i] == b.addr[i]);
268: i += (a.addr[i] == b.addr[i]);
269: i += (a.addr[i] == b.addr[i]);
270: return 32 * i + 31 - u32_log2(a.addr[i] ^ b.addr[i]);
271: }
272:
273: static inline u32 ip4_getbit(ip4_addr a, uint pos)
274: { return _I(a) & (0x80000000 >> pos); }
275:
276: static inline u32 ip6_getbit(ip6_addr a, uint pos)
277: { return a.addr[pos / 32] & (0x80000000 >> (pos % 32)); }
278:
279: static inline u32 ip4_setbit(ip4_addr *a, uint pos)
280: { return _I(*a) |= (0x80000000 >> pos); }
281:
282: static inline u32 ip6_setbit(ip6_addr *a, uint pos)
283: { return a->addr[pos / 32] |= (0x80000000 >> (pos % 32)); }
284:
285: static inline u32 ip4_clrbit(ip4_addr *a, uint pos)
286: { return _I(*a) &= ~(0x80000000 >> pos); }
287:
288: static inline u32 ip6_clrbit(ip6_addr *a, uint pos)
289: { return a->addr[pos / 32] &= ~(0x80000000 >> (pos % 32)); }
290:
291: static inline ip4_addr ip4_opposite_m1(ip4_addr a)
292: { return _MI4(_I(a) ^ 1); }
293:
294: static inline ip4_addr ip4_opposite_m2(ip4_addr a)
295: { return _MI4(_I(a) ^ 3); }
296:
297: static inline ip6_addr ip6_opposite_m1(ip6_addr a)
298: { return _MI6(_I0(a), _I1(a), _I2(a), _I3(a) ^ 1); }
299:
300: static inline ip6_addr ip6_opposite_m2(ip6_addr a)
301: { return _MI6(_I0(a), _I1(a), _I2(a), _I3(a) ^ 3); }
302:
303: ip4_addr ip4_class_mask(ip4_addr ad);
304:
305: #define ipa_opposite_m1(x) ip6_opposite_m1(x)
306: #define ipa_opposite_m2(x) ip6_opposite_m2(x)
307:
308:
309: /*
310: * Host/network order conversions
311: */
312:
313: static inline ip4_addr ip4_hton(ip4_addr a)
314: { return _MI4(htonl(_I(a))); }
315:
316: static inline ip4_addr ip4_ntoh(ip4_addr a)
317: { return _MI4(ntohl(_I(a))); }
318:
319: static inline ip6_addr ip6_hton(ip6_addr a)
320: { return _MI6(htonl(_I0(a)), htonl(_I1(a)), htonl(_I2(a)), htonl(_I3(a))); }
321:
322: static inline ip6_addr ip6_ntoh(ip6_addr a)
323: { return _MI6(ntohl(_I0(a)), ntohl(_I1(a)), ntohl(_I2(a)), ntohl(_I3(a))); }
324:
325: #define MPLS_MAX_LABEL_STACK 8
326: typedef struct mpls_label_stack {
327: uint len;
328: u32 stack[MPLS_MAX_LABEL_STACK];
329: } mpls_label_stack;
330:
331: static inline int
332: mpls_get(const char *buf, int buflen, u32 *stack)
333: {
334: for (int i=0; (i<MPLS_MAX_LABEL_STACK) && (i*4+3 < buflen); i++)
335: {
336: u32 s = get_u32(buf + i*4);
337: stack[i] = s >> 12;
338: if (s & 0x100)
339: return i+1;
340: }
341: return -1;
342: }
343:
344: static inline int
345: mpls_put(char *buf, int len, u32 *stack)
346: {
347: for (int i=0; i<len; i++)
348: put_u32(buf + i*4, stack[i] << 12 | (i+1 == len ? 0x100 : 0));
349:
350: return len*4;
351: }
352:
353: /*
354: * Unaligned data access (in network order)
355: */
356:
357: static inline ip4_addr get_ip4(const void *buf)
358: {
359: return _MI4(get_u32(buf));
360: }
361:
362: static inline ip6_addr get_ip6(const void *buf)
363: {
364: ip6_addr a;
365: memcpy(&a, buf, 16);
366: return ip6_ntoh(a);
367: }
368:
369: static inline void * put_ip4(void *buf, ip4_addr a)
370: {
371: put_u32(buf, _I(a));
372: return buf+4;
373: }
374:
375: static inline void * put_ip6(void *buf, ip6_addr a)
376: {
377: a = ip6_hton(a);
378: memcpy(buf, &a, 16);
379: return buf+16;
380: }
381:
382:
383: /*
384: * Binary/text form conversions
385: */
386:
387: char *ip4_ntop(ip4_addr a, char *b);
388: char *ip6_ntop(ip6_addr a, char *b);
389:
390: static inline char * ip4_ntox(ip4_addr a, char *b)
391: { return b + bsprintf(b, "%08x", _I(a)); }
392:
393: static inline char * ip6_ntox(ip6_addr a, char *b)
394: { return b + bsprintf(b, "%08x.%08x.%08x.%08x", _I0(a), _I1(a), _I2(a), _I3(a)); }
395:
396: int ip4_pton(const char *a, ip4_addr *o);
397: int ip6_pton(const char *a, ip6_addr *o);
398:
399:
400: /*
401: * Miscellaneous
402: */
403:
404: char *ip_scope_text(uint);
405:
406: #endif
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