forked from kohler/click
-
Notifications
You must be signed in to change notification settings - Fork 0
/
ip6address.cc
460 lines (403 loc) · 11.8 KB
/
ip6address.cc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
// -*- c-basic-offset: 4; related-file-name: "../include/click/ip6address.hh" -*-
/*
* ip6address.{cc,hh} -- an IP6 address class
* Peilei Fan, Eddie Kohler
*
* Copyright (c) 1999-2000 Massachusetts Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, subject to the conditions
* listed in the Click LICENSE file. These conditions include: you must
* preserve this copyright notice, and you cannot mention the copyright
* holders in advertising related to the Software without their permission.
* The Software is provided WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED. This
* notice is a summary of the Click LICENSE file; the license in that file is
* legally binding.
*/
#include <click/config.h>
#include <click/glue.hh>
#include <click/ip6address.hh>
#include <click/ipaddress.hh>
#include <click/straccum.hh>
#include <click/confparse.hh>
#include <click/args.hh>
#if !CLICK_TOOL
# include <click/standard/addressinfo.hh>
#endif
CLICK_DECLS
IP6Address::IP6Address(const String &str)
{
static_assert(sizeof(*this) == 16, "IPAddress has the wrong size.");
static_assert(sizeof(click_in6_addr) == 16, "click_in6_addr has the wrong size.");
static_assert(sizeof(struct click_ip6) == 40, "click_ip6 has the wrong size.");
if (!IP6AddressArg::parse(str, *this))
memset(&_addr, 0, sizeof(_addr));
}
IP6Address
IP6Address::make_prefix(int prefix_len)
{
assert(prefix_len >= 0 && prefix_len <= 128);
IP6Address a = IP6Address::uninitialized_t();
int i;
for (i = 0; i < 4 && prefix_len >= 32; ++i, prefix_len -= 32)
a._addr.s6_addr32[i] = 0xFFFFFFFFU;
if (i < 4 && prefix_len > 0) {
a._addr.s6_addr32[i] = htonl(0xFFFFFFFFU << (32 - prefix_len));
++i;
}
for (; i < 4; ++i)
a._addr.s6_addr32[i] = 0;
return a;
}
IP6Address
IP6Address::make_inverted_prefix(int prefix_len)
{
assert(prefix_len >= 0 && prefix_len <= 128);
IP6Address a = IP6Address::uninitialized_t();
int i;
for (i = 0; i < 4 && prefix_len >= 32; ++i, prefix_len -= 32)
a._addr.s6_addr32[i] = 0;
if (i < 4 && prefix_len > 0) {
a._addr.s6_addr32[i] = htonl(0xFFFFFFFFU >> prefix_len);
++i;
}
for (; i < 4; ++i)
a._addr.s6_addr32[i] = 0xFFFFFFFFU;
return a;
}
int
IP6Address::mask_to_prefix_len() const
{
// check that prefix is 0xFFFFFFFF
int word = 0;
while (word < 4 && _addr.s6_addr32[word] == 0xFFFFFFFFU)
word++;
if (word == 4)
return 128;
// check that suffix is zeros
for (int zero_word = word + 1; zero_word < 4; ++zero_word)
if (_addr.s6_addr32[zero_word] != 0)
return -1;
// check swing word
int prefix = IPAddress(_addr.s6_addr32[word]).mask_to_prefix_len();
return prefix + (prefix >= 0 ? word * 32 : 0);
}
bool
IP6Address::ether_address(EtherAddress &mac) const
{
if (has_ether_address()) {
unsigned char *d = mac.data();
d[0] = _addr.s6_addr[8];
d[1] = _addr.s6_addr[9];
d[2] = _addr.s6_addr[10];
d[3] = _addr.s6_addr[13];
d[4] = _addr.s6_addr[14];
d[5] = _addr.s6_addr[15];
return true;
} else
return false;
}
bool
IP6Address::ip4_address(IPAddress &ip4) const
{
if (has_ip4_address()) {
ip4 = IPAddress(_addr.s6_addr32[3]);
return true;
} else
return false;
}
void
IP6Address::unparse(StringAccum &sa) const
{
// Unparse according to RFC 5952
const uint32_t *a32 = data32();
const uint16_t *a16 = data16();
const uint8_t *a8 = data();
// :: and special IPv4 addresses
if (a32[0] == 0 && a32[1] == 0) {
if (a32[2] == 0 && a32[3] == 0) {
sa.append("::", 2);
return;
} else if (a32[2] == 0) {
sa.snprintf(18, "::%d.%d.%d.%d", a8[12], a8[13], a8[14], a8[15]);
return;
} else {
sa.snprintf(23, "::ffff:%d.%d.%d.%d", a8[12], a8[13], a8[14], a8[15]);
return;
}
}
// find the longest sequences of zero fields; if two sequences have equal
// length, choose the first
int zp = 0, zl = 0, lzp = 0;
for (int p = 0; p < 8; ++p)
if (a16[p] != 0)
lzp = p + 1;
else if (p + 1 - lzp > zl) {
zp = lzp;
zl = p + 1 - lzp;
}
for (int p = 0; p < 8; ++p)
if (p == zp && zl > 1) {
p += zl - 1;
sa.append("::", p == 7 ? 2 : 1);
} else
sa.snprintf(5, p ? ":%x" : "%x", ntohs(a16[p]));
}
String
IP6Address::unparse() const
{
const uint32_t *a32 = data32();
if (a32[0] == 0 && a32[1] == 0 && a32[2] == 0 && a32[3] == 0)
return String::make_stable("::", 2);
else {
StringAccum sa;
unparse(sa);
return sa.take_string();
}
}
String
IP6Address::unparse_expanded() const
{
const uint16_t *a16 = data16();
char buf[48];
sprintf(buf, "%x:%x:%x:%x:%x:%x:%x:%x",
ntohs(a16[0]), ntohs(a16[1]), ntohs(a16[2]), ntohs(a16[3]),
ntohs(a16[4]), ntohs(a16[5]), ntohs(a16[6]), ntohs(a16[7]));
return String(buf);
}
// those two methods will calculate the checksum field of ICMP6 Message.
// The checksum is the 16-bit one's complement
// of the one's complement sum of the entire ICMPv6 message starting with the
// ICMPv6 message type field, prepended with a "pseudo-header" of IPv6 header
// fields, as specified in [IPv6, section 8.1]. The Next Header value used in
// the pseudo-header is 58 (i.e. 0x3a). (NOTE: the inclusion of a pseudo-header in the
// ICMPv6 checksum is a change from IPv4; see [RFC 2460] for the rationale
// for this change.)
// A "pseudo-header" include src and dst address of ipv6 header, packet length,
// protocal field (for ICMP, it is 58) field. Packet length is the
// payloadlength from the IPv6 header, minus the length of any extension
// header present between the IPv6 header and the upper-layer header.
// The following methods only differ at how it deal with ip6 address, i.e. add 32 bit
// a time or 16 bits a time.
uint16_t
in6_fast_cksum(const struct click_in6_addr *saddr,
const struct click_in6_addr *daddr,
uint16_t len,
uint8_t proto,
uint16_t ori_csum,
const unsigned char *addr,
uint16_t len2)
{
uint16_t ulen;
uint16_t uproto;
uint16_t answer = 0;
uint32_t csum =0;
uint32_t carry;
//get the sum of source and destination address
for (int i=0; i<4; i++) {
csum += ntohl(saddr->s6_addr32[i]);
carry = (csum < ntohl(saddr->s6_addr32[i]));
csum += carry;
}
for (int i=0; i<4; i++) {
csum += ntohl(daddr->s6_addr32[i]);
carry = (csum < ntohl(daddr->s6_addr32[i]));
csum += carry;
}
//get the sum of other fields: packet length, protocal
ulen = ntohs(len);
csum += ulen;
uproto = proto;
csum += uproto;
//get the sum of the ICMP6 package
uint16_t nleft = ntohs(len2);
const uint16_t *w = (const uint16_t *)addr;
while (nleft > 1) {
uint16_t w2=*w++;
csum += ntohs(w2);
nleft -=2;
}
//mop up an odd byte, if necessary
if (nleft == 1) {
*(unsigned char *)(&answer) = *(const unsigned char *)w ;
csum += ntohs(answer);
}
csum -= ntohs(ori_csum); //get rid of the effect of ori_csum in the calculation
// fold >=32-bit csum to 16-bits
while (csum>>16) {
csum = (csum & 0xffff) + (csum >> 16);
}
answer = ~csum; // truncate to 16 bits
return answer;
}
//This is the slow way for in6_cksum
unsigned short
in6_cksum(const struct click_in6_addr *saddr,
const struct click_in6_addr *daddr,
uint16_t len,
uint8_t proto,
uint16_t ori_csum,
unsigned char *addr,
uint16_t len2)
{
uint16_t ulen;
uint16_t uproto;
uint16_t answer = 0;
uint32_t csum =0;
//get the sum of source and destination address
for (int i=0; i<8; i++) {
csum += ntohs(saddr->s6_addr16[i]);
}
for (int i=0; i<8; i++) {
csum += ntohs(daddr->s6_addr16[i]);
}
//get the sum of other fields: packet length, protocal
ulen = ntohs(len);
csum += ulen;
uproto = proto;
csum += uproto;
//get the sum of the ICMP6 package
uint16_t nleft = ntohs(len2);
const uint16_t *w = (const uint16_t *)addr;
while (nleft > 1) {
uint16_t w2=*w++;
csum += ntohs(w2);
nleft -=2;
}
//mop up an odd byte, if necessary
if (nleft == 1) {
*(unsigned char *)(&answer) = *(const unsigned char *)w ;
csum += ntohs(answer);
}
csum -= ntohs(ori_csum); //get rid of the effect of ori_csum in the calculation
// fold >=32-bit csum to 16-bits
while (csum>>16) {
csum = (csum & 0xffff) + (csum >> 16);
}
answer = ~csum; // truncate to 16 bits
return answer;
}
const char *
IP6AddressArg::basic_parse(const String &str, IP6Address &result, const ArgContext &args)
{
uint16_t *parts = result.data16();
memset(parts, 255, 16);
int d = 0, p = 0, coloncolon = -1;
const char *begin = str.begin(), *end = str.end(), *s;
for (s = begin; s != end; ++s) {
int digit;
if (*s >= '0' && *s <= '9')
digit = *s - '0';
else if (*s >= 'a' && *s <= 'f')
digit = *s - 'a' + 10;
else if (*s >= 'A' && *s <= 'F')
digit = *s - 'A' + 10;
else if (*s == ':' && s + 1 != end && d != 7 && (p != 0 || d == 0)) {
if (s[1] == ':' && coloncolon < 0) {
coloncolon = d = (p ? d + 1 : d);
parts[d] = 0;
++s;
} else if (!isxdigit((unsigned char) s[1]) || p == 0)
break;
p = 0;
++d;
continue;
} else
break;
if (p == 4)
break;
parts[d] = (p != 0 ? parts[d] << 4 : 0) + digit;
++p;
}
if (p == 0)
--d;
// check for IPv4 address suffix
if ((d == 6 || (d < 6 && coloncolon >= 0)) && s != end) {
const char *t = s - 1;
while (t != begin && *t != ':')
--t;
IPAddress ipv4;
if (t != begin
&& IPAddressArg::parse(str.substring(t + 1, end), ipv4, args)) {
int dd = d == coloncolon ? d + 1 : d;
parts[dd] = (ipv4.data()[0] << 8) + ipv4.data()[1];
parts[dd + 1] = (ipv4.data()[2] << 8) + ipv4.data()[3];
d = dd + 1;
s = end;
}
}
if (d != 7 && coloncolon < 0)
return begin;
for (int i = 0; i <= d; ++i)
parts[i] = htons(parts[i]);
if (coloncolon >= 0 && d != 7) {
int numextra = 7 - d;
memmove(&parts[coloncolon + 1 + numextra], &parts[coloncolon + 1], sizeof(uint16_t) * (d - coloncolon));
memset(&parts[coloncolon + 1], 0, sizeof(uint16_t) * numextra);
}
return s;
}
bool
IP6AddressArg::parse(const String &str, IP6Address &result, const ArgContext &args)
{
IP6Address a = IP6Address::uninitialized_t();
if (basic_parse(str, a, args) == str.end()) {
result = a;
return true;
}
#if !CLICK_TOOL
return AddressInfo::query_ip6(str, result.data(), args.context());
#else
return false;
#endif
}
bool
IP6PrefixArg::parse(const String &str,
IP6Address &result_addr, int &result_prefix_len,
const ArgContext &args) const
{
const char *begin = str.begin(), *slash = str.end(), *end = str.end();
while (slash != begin)
if (*--slash == '/')
break;
if (slash != begin && slash + 1 != end) {
IP6Address a = IP6Address::uninitialized_t();
if (IP6AddressArg::parse(str.substring(begin, slash), a, args)) {
int l = -1;
IP6Address m = IP6Address::uninitialized_t();
if ((IntArg(10).parse(str.substring(slash + 1, end), l)
&& l >= 0 && l <= 128)
|| (IP6AddressArg::parse(str.substring(slash + 1, end), m, args)
&& (l = m.mask_to_prefix_len()) >= 0)) {
result_addr = a;
result_prefix_len = l;
return true;
} else
return false;
}
}
if (allow_bare_address && IP6AddressArg::parse(str, result_addr, args)) {
result_prefix_len = 128;
return true;
}
#if !CLICK_TOOL
return AddressInfo::query_ip6_prefix(str, result_addr.data(),
&result_prefix_len, args.context());
#else
return false;
#endif
}
bool
IP6PrefixArg::parse(const String &str,
IP6Address &result_addr, IP6Address &result_prefix,
const ArgContext &args) const
{
int prefix_len;
if (parse(str, result_addr, prefix_len, args)) {
result_prefix = IP6Address::make_prefix(prefix_len);
return true;
} else
return false;
}
CLICK_ENDDECLS