Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * | |
4 | * Authors: | |
5 | * Pedro Roque <roque@di.fc.ul.pt> | |
6 | * | |
1da177e4 LT |
7 | * This program is free software; you can redistribute it and/or |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #ifndef _NET_IPV6_H | |
14 | #define _NET_IPV6_H | |
15 | ||
16 | #include <linux/ipv6.h> | |
17 | #include <linux/hardirq.h> | |
20283d84 | 18 | #include <net/if_inet6.h> |
1da177e4 LT |
19 | #include <net/ndisc.h> |
20 | #include <net/flow.h> | |
21 | #include <net/snmp.h> | |
22 | ||
23 | #define SIN6_LEN_RFC2133 24 | |
24 | ||
25 | #define IPV6_MAXPLEN 65535 | |
26 | ||
27 | /* | |
28 | * NextHeader field of IPv6 header | |
29 | */ | |
30 | ||
31 | #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */ | |
32 | #define NEXTHDR_TCP 6 /* TCP segment. */ | |
33 | #define NEXTHDR_UDP 17 /* UDP message. */ | |
34 | #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */ | |
35 | #define NEXTHDR_ROUTING 43 /* Routing header. */ | |
36 | #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */ | |
37 | #define NEXTHDR_ESP 50 /* Encapsulating security payload. */ | |
38 | #define NEXTHDR_AUTH 51 /* Authentication header. */ | |
39 | #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ | |
40 | #define NEXTHDR_NONE 59 /* No next header */ | |
41 | #define NEXTHDR_DEST 60 /* Destination options header. */ | |
2b741653 | 42 | #define NEXTHDR_MOBILITY 135 /* Mobility header. */ |
1da177e4 LT |
43 | |
44 | #define NEXTHDR_MAX 255 | |
45 | ||
46 | ||
47 | ||
48 | #define IPV6_DEFAULT_HOPLIMIT 64 | |
49 | #define IPV6_DEFAULT_MCASTHOPS 1 | |
50 | ||
51 | /* | |
52 | * Addr type | |
53 | * | |
54 | * type - unicast | multicast | |
55 | * scope - local | site | global | |
56 | * v4 - compat | |
57 | * v4mapped | |
58 | * any | |
59 | * loopback | |
60 | */ | |
61 | ||
62 | #define IPV6_ADDR_ANY 0x0000U | |
63 | ||
64 | #define IPV6_ADDR_UNICAST 0x0001U | |
65 | #define IPV6_ADDR_MULTICAST 0x0002U | |
66 | ||
67 | #define IPV6_ADDR_LOOPBACK 0x0010U | |
68 | #define IPV6_ADDR_LINKLOCAL 0x0020U | |
69 | #define IPV6_ADDR_SITELOCAL 0x0040U | |
70 | ||
71 | #define IPV6_ADDR_COMPATv4 0x0080U | |
72 | ||
73 | #define IPV6_ADDR_SCOPE_MASK 0x00f0U | |
74 | ||
75 | #define IPV6_ADDR_MAPPED 0x1000U | |
1da177e4 LT |
76 | |
77 | /* | |
78 | * Addr scopes | |
79 | */ | |
1da177e4 LT |
80 | #define IPV6_ADDR_MC_SCOPE(a) \ |
81 | ((a)->s6_addr[1] & 0x0f) /* nonstandard */ | |
82 | #define __IPV6_ADDR_SCOPE_INVALID -1 | |
1da177e4 LT |
83 | #define IPV6_ADDR_SCOPE_NODELOCAL 0x01 |
84 | #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 | |
85 | #define IPV6_ADDR_SCOPE_SITELOCAL 0x05 | |
86 | #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 | |
87 | #define IPV6_ADDR_SCOPE_GLOBAL 0x0e | |
88 | ||
5ced1339 LL |
89 | /* |
90 | * Addr flags | |
91 | */ | |
5ced1339 LL |
92 | #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \ |
93 | ((a)->s6_addr[1] & 0x10) | |
94 | #define IPV6_ADDR_MC_FLAG_PREFIX(a) \ | |
95 | ((a)->s6_addr[1] & 0x20) | |
96 | #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \ | |
97 | ((a)->s6_addr[1] & 0x40) | |
5ced1339 | 98 | |
1da177e4 LT |
99 | /* |
100 | * fragmentation header | |
101 | */ | |
102 | ||
103 | struct frag_hdr { | |
44473a6b AV |
104 | __u8 nexthdr; |
105 | __u8 reserved; | |
106 | __be16 frag_off; | |
107 | __be32 identification; | |
1da177e4 LT |
108 | }; |
109 | ||
110 | #define IP6_MF 0x0001 | |
111 | ||
1da177e4 LT |
112 | #include <net/sock.h> |
113 | ||
114 | /* sysctls */ | |
1da177e4 | 115 | extern int sysctl_mld_max_msf; |
3d7cc2ba PE |
116 | extern struct ctl_path net_ipv6_ctl_path[]; |
117 | ||
087fe240 | 118 | #define _DEVINC(net, statname, modifier, idev, field) \ |
14878f75 | 119 | ({ \ |
a11d206d YH |
120 | struct inet6_dev *_idev = (idev); \ |
121 | if (likely(_idev != NULL)) \ | |
14878f75 | 122 | SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \ |
9261e537 | 123 | SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ |
a11d206d | 124 | }) |
14878f75 | 125 | |
be281e55 ED |
126 | /* per device counters are atomic_long_t */ |
127 | #define _DEVINCATOMIC(net, statname, modifier, idev, field) \ | |
128 | ({ \ | |
129 | struct inet6_dev *_idev = (idev); \ | |
130 | if (likely(_idev != NULL)) \ | |
131 | SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ | |
132 | SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ | |
133 | }) | |
134 | ||
2a24444f ED |
135 | /* per device and per net counters are atomic_long_t */ |
136 | #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ | |
137 | ({ \ | |
138 | struct inet6_dev *_idev = (idev); \ | |
139 | if (likely(_idev != NULL)) \ | |
140 | SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ | |
141 | SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ | |
142 | }) | |
143 | ||
087fe240 | 144 | #define _DEVADD(net, statname, modifier, idev, field, val) \ |
8e7999c4 PE |
145 | ({ \ |
146 | struct inet6_dev *_idev = (idev); \ | |
147 | if (likely(_idev != NULL)) \ | |
148 | SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ | |
9261e537 | 149 | SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\ |
8e7999c4 PE |
150 | }) |
151 | ||
edf391ff NH |
152 | #define _DEVUPD(net, statname, modifier, idev, field, val) \ |
153 | ({ \ | |
154 | struct inet6_dev *_idev = (idev); \ | |
155 | if (likely(_idev != NULL)) \ | |
156 | SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \ | |
157 | SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\ | |
158 | }) | |
159 | ||
14878f75 | 160 | /* MIBs */ |
14878f75 | 161 | |
087fe240 | 162 | #define IP6_INC_STATS(net, idev,field) \ |
4ce3c183 | 163 | _DEVINC(net, ipv6, 64, idev, field) |
087fe240 | 164 | #define IP6_INC_STATS_BH(net, idev,field) \ |
4ce3c183 | 165 | _DEVINC(net, ipv6, 64_BH, idev, field) |
edf391ff | 166 | #define IP6_ADD_STATS(net, idev,field,val) \ |
4ce3c183 | 167 | _DEVADD(net, ipv6, 64, idev, field, val) |
087fe240 | 168 | #define IP6_ADD_STATS_BH(net, idev,field,val) \ |
4ce3c183 | 169 | _DEVADD(net, ipv6, 64_BH, idev, field, val) |
edf391ff | 170 | #define IP6_UPD_PO_STATS(net, idev,field,val) \ |
4ce3c183 | 171 | _DEVUPD(net, ipv6, 64, idev, field, val) |
edf391ff | 172 | #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \ |
4ce3c183 | 173 | _DEVUPD(net, ipv6, 64_BH, idev, field, val) |
087fe240 | 174 | #define ICMP6_INC_STATS(net, idev, field) \ |
be281e55 | 175 | _DEVINCATOMIC(net, icmpv6, , idev, field) |
087fe240 | 176 | #define ICMP6_INC_STATS_BH(net, idev, field) \ |
be281e55 | 177 | _DEVINCATOMIC(net, icmpv6, _BH, idev, field) |
087fe240 DL |
178 | |
179 | #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ | |
2a24444f | 180 | _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) |
087fe240 | 181 | #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \ |
2a24444f | 182 | _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) |
087fe240 | 183 | #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \ |
2a24444f | 184 | _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) |
14878f75 | 185 | |
fd2c3ef7 | 186 | struct ip6_ra_chain { |
1da177e4 LT |
187 | struct ip6_ra_chain *next; |
188 | struct sock *sk; | |
189 | int sel; | |
190 | void (*destructor)(struct sock *); | |
191 | }; | |
192 | ||
193 | extern struct ip6_ra_chain *ip6_ra_chain; | |
194 | extern rwlock_t ip6_ra_lock; | |
195 | ||
196 | /* | |
197 | This structure is prepared by protocol, when parsing | |
198 | ancillary data and passed to IPv6. | |
199 | */ | |
200 | ||
fd2c3ef7 | 201 | struct ipv6_txoptions { |
1da177e4 LT |
202 | /* Length of this structure */ |
203 | int tot_len; | |
204 | ||
205 | /* length of extension headers */ | |
206 | ||
207 | __u16 opt_flen; /* after fragment hdr */ | |
208 | __u16 opt_nflen; /* before fragment hdr */ | |
209 | ||
210 | struct ipv6_opt_hdr *hopopt; | |
211 | struct ipv6_opt_hdr *dst0opt; | |
212 | struct ipv6_rt_hdr *srcrt; /* Routing Header */ | |
1da177e4 LT |
213 | struct ipv6_opt_hdr *dst1opt; |
214 | ||
215 | /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ | |
216 | }; | |
217 | ||
fd2c3ef7 | 218 | struct ip6_flowlabel { |
1da177e4 | 219 | struct ip6_flowlabel *next; |
90bcaf7b | 220 | __be32 label; |
db3459d1 | 221 | atomic_t users; |
1da177e4 LT |
222 | struct in6_addr dst; |
223 | struct ipv6_txoptions *opt; | |
1da177e4 LT |
224 | unsigned long linger; |
225 | u8 share; | |
226 | u32 owner; | |
227 | unsigned long lastuse; | |
228 | unsigned long expires; | |
60e8fbc4 | 229 | struct net *fl_net; |
1da177e4 LT |
230 | }; |
231 | ||
f3a7c66b HH |
232 | #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) |
233 | #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) | |
1da177e4 | 234 | |
fd2c3ef7 | 235 | struct ipv6_fl_socklist { |
1da177e4 LT |
236 | struct ipv6_fl_socklist *next; |
237 | struct ip6_flowlabel *fl; | |
238 | }; | |
239 | ||
90bcaf7b | 240 | extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); |
1da177e4 LT |
241 | extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, |
242 | struct ip6_flowlabel * fl, | |
243 | struct ipv6_txoptions * fopt); | |
244 | extern void fl6_free_socklist(struct sock *sk); | |
245 | extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); | |
0a3e78ac | 246 | extern int ip6_flowlabel_init(void); |
1da177e4 LT |
247 | extern void ip6_flowlabel_cleanup(void); |
248 | ||
249 | static inline void fl6_sock_release(struct ip6_flowlabel *fl) | |
250 | { | |
251 | if (fl) | |
252 | atomic_dec(&fl->users); | |
253 | } | |
254 | ||
725a8ff0 | 255 | extern int ip6_ra_control(struct sock *sk, int sel); |
1da177e4 | 256 | |
e5bbef20 | 257 | extern int ipv6_parse_hopopts(struct sk_buff *skb); |
1da177e4 LT |
258 | |
259 | extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); | |
333fad53 YH |
260 | extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, |
261 | int newtype, | |
262 | struct ipv6_opt_hdr __user *newopt, | |
263 | int newoptlen); | |
df9890c3 YH |
264 | struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
265 | struct ipv6_txoptions *opt); | |
1da177e4 | 266 | |
399c07de ACM |
267 | extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb); |
268 | ||
e5a2bb84 | 269 | int ip6_frag_nqueues(struct net *net); |
6ddc0822 | 270 | int ip6_frag_mem(struct net *net); |
1da177e4 | 271 | |
9874c41c JP |
272 | #define IPV6_FRAG_HIGH_THRESH (256 * 1024) /* 262144 */ |
273 | #define IPV6_FRAG_LOW_THRESH (192 * 1024) /* 196608 */ | |
274 | #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ | |
1da177e4 | 275 | |
b1cacb68 YH |
276 | extern int __ipv6_addr_type(const struct in6_addr *addr); |
277 | static inline int ipv6_addr_type(const struct in6_addr *addr) | |
278 | { | |
279 | return __ipv6_addr_type(addr) & 0xffff; | |
280 | } | |
1da177e4 LT |
281 | |
282 | static inline int ipv6_addr_scope(const struct in6_addr *addr) | |
283 | { | |
b1cacb68 YH |
284 | return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; |
285 | } | |
286 | ||
287 | static inline int __ipv6_addr_src_scope(int type) | |
288 | { | |
a02cec21 | 289 | return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); |
b1cacb68 YH |
290 | } |
291 | ||
292 | static inline int ipv6_addr_src_scope(const struct in6_addr *addr) | |
293 | { | |
294 | return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); | |
1da177e4 LT |
295 | } |
296 | ||
297 | static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) | |
298 | { | |
db3459d1 | 299 | return memcmp(a1, a2, sizeof(struct in6_addr)); |
1da177e4 LT |
300 | } |
301 | ||
f2ffd9ee PM |
302 | static inline int |
303 | ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, | |
304 | const struct in6_addr *a2) | |
305 | { | |
a02cec21 ED |
306 | return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | |
307 | ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | | |
308 | ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | | |
309 | ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); | |
f2ffd9ee PM |
310 | } |
311 | ||
1da177e4 LT |
312 | static inline void ipv6_addr_prefix(struct in6_addr *pfx, |
313 | const struct in6_addr *addr, | |
314 | int plen) | |
315 | { | |
316 | /* caller must guarantee 0 <= plen <= 128 */ | |
317 | int o = plen >> 3, | |
318 | b = plen & 0x7; | |
319 | ||
db3459d1 | 320 | memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); |
1da177e4 | 321 | memcpy(pfx->s6_addr, addr, o); |
db3459d1 | 322 | if (b != 0) |
1da177e4 | 323 | pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); |
1da177e4 LT |
324 | } |
325 | ||
1da177e4 | 326 | static inline void ipv6_addr_set(struct in6_addr *addr, |
48818f82 AV |
327 | __be32 w1, __be32 w2, |
328 | __be32 w3, __be32 w4) | |
1da177e4 LT |
329 | { |
330 | addr->s6_addr32[0] = w1; | |
331 | addr->s6_addr32[1] = w2; | |
332 | addr->s6_addr32[2] = w3; | |
333 | addr->s6_addr32[3] = w4; | |
334 | } | |
1da177e4 LT |
335 | |
336 | static inline int ipv6_addr_equal(const struct in6_addr *a1, | |
337 | const struct in6_addr *a2) | |
338 | { | |
a02cec21 ED |
339 | return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | |
340 | (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | | |
341 | (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | | |
342 | (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; | |
1da177e4 LT |
343 | } |
344 | ||
48818f82 | 345 | static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2, |
1da177e4 LT |
346 | unsigned int prefixlen) |
347 | { | |
348 | unsigned pdw, pbi; | |
349 | ||
350 | /* check complete u32 in prefix */ | |
351 | pdw = prefixlen >> 5; | |
352 | if (pdw && memcmp(a1, a2, pdw << 2)) | |
353 | return 0; | |
354 | ||
355 | /* check incomplete u32 in prefix */ | |
356 | pbi = prefixlen & 0x1f; | |
357 | if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) | |
358 | return 0; | |
359 | ||
360 | return 1; | |
361 | } | |
362 | ||
363 | static inline int ipv6_prefix_equal(const struct in6_addr *a1, | |
364 | const struct in6_addr *a2, | |
365 | unsigned int prefixlen) | |
366 | { | |
367 | return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, | |
368 | prefixlen); | |
369 | } | |
370 | ||
2588fe1d | 371 | struct inet_frag_queue; |
2588fe1d | 372 | |
0b5ccb2e PM |
373 | enum ip6_defrag_users { |
374 | IP6_DEFRAG_LOCAL_DELIVER, | |
375 | IP6_DEFRAG_CONNTRACK_IN, | |
4be929be | 376 | __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
0b5ccb2e | 377 | IP6_DEFRAG_CONNTRACK_OUT, |
4be929be | 378 | __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
8fa9ff68 | 379 | IP6_DEFRAG_CONNTRACK_BRIDGE_IN, |
4be929be | 380 | __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
0b5ccb2e PM |
381 | }; |
382 | ||
c6fda282 PE |
383 | struct ip6_create_arg { |
384 | __be32 id; | |
0b5ccb2e | 385 | u32 user; |
b71d1d42 ED |
386 | const struct in6_addr *src; |
387 | const struct in6_addr *dst; | |
c6fda282 PE |
388 | }; |
389 | ||
390 | void ip6_frag_init(struct inet_frag_queue *q, void *a); | |
abd6523d | 391 | int ip6_frag_match(struct inet_frag_queue *q, void *a); |
c6fda282 | 392 | |
1da177e4 LT |
393 | static inline int ipv6_addr_any(const struct in6_addr *a) |
394 | { | |
a02cec21 ED |
395 | return (a->s6_addr32[0] | a->s6_addr32[1] | |
396 | a->s6_addr32[2] | a->s6_addr32[3]) == 0; | |
1da177e4 LT |
397 | } |
398 | ||
f630e43a YH |
399 | static inline int ipv6_addr_loopback(const struct in6_addr *a) |
400 | { | |
a02cec21 ED |
401 | return (a->s6_addr32[0] | a->s6_addr32[1] | |
402 | a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0; | |
f630e43a YH |
403 | } |
404 | ||
e773e4fa BH |
405 | static inline int ipv6_addr_v4mapped(const struct in6_addr *a) |
406 | { | |
a02cec21 ED |
407 | return (a->s6_addr32[0] | a->s6_addr32[1] | |
408 | (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0; | |
e773e4fa BH |
409 | } |
410 | ||
99cd07a5 JMT |
411 | /* |
412 | * Check for a RFC 4843 ORCHID address | |
413 | * (Overlay Routable Cryptographic Hash Identifiers) | |
414 | */ | |
415 | static inline int ipv6_addr_orchid(const struct in6_addr *a) | |
416 | { | |
a02cec21 | 417 | return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); |
99cd07a5 JMT |
418 | } |
419 | ||
f15364bd AC |
420 | static inline void ipv6_addr_set_v4mapped(const __be32 addr, |
421 | struct in6_addr *v4mapped) | |
422 | { | |
423 | ipv6_addr_set(v4mapped, | |
424 | 0, 0, | |
425 | htonl(0x0000FFFF), | |
426 | addr); | |
427 | } | |
428 | ||
971f359d YH |
429 | /* |
430 | * find the first different bit between two addresses | |
431 | * length of address must be a multiple of 32bits | |
432 | */ | |
433 | static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) | |
434 | { | |
ef296f56 | 435 | const __be32 *a1 = token1, *a2 = token2; |
971f359d YH |
436 | int i; |
437 | ||
438 | addrlen >>= 2; | |
439 | ||
440 | for (i = 0; i < addrlen; i++) { | |
ef296f56 AV |
441 | __be32 xb = a1[i] ^ a2[i]; |
442 | if (xb) | |
d57b8fb8 | 443 | return i * 32 + 31 - __fls(ntohl(xb)); |
971f359d YH |
444 | } |
445 | ||
446 | /* | |
447 | * we should *never* get to this point since that | |
448 | * would mean the addrs are equal | |
449 | * | |
450 | * However, we do get to it 8) And exacly, when | |
451 | * addresses are equal 8) | |
452 | * | |
453 | * ip route add 1111::/128 via ... | |
454 | * ip route add 1111::/64 via ... | |
455 | * and we are here. | |
456 | * | |
457 | * Ideally, this function should stop comparison | |
458 | * at prefix length. It does not, but it is still OK, | |
459 | * if returned value is greater than prefix length. | |
460 | * --ANK (980803) | |
461 | */ | |
a02cec21 | 462 | return addrlen << 5; |
971f359d YH |
463 | } |
464 | ||
465 | static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) | |
466 | { | |
467 | return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); | |
468 | } | |
469 | ||
87c48fa3 | 470 | extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt); |
7ea2f2c5 | 471 | |
1da177e4 LT |
472 | /* |
473 | * Prototypes exported by ipv6 | |
474 | */ | |
475 | ||
476 | /* | |
477 | * rcv function (called from netdevice level) | |
478 | */ | |
479 | ||
480 | extern int ipv6_rcv(struct sk_buff *skb, | |
481 | struct net_device *dev, | |
f2ccd8fa DM |
482 | struct packet_type *pt, |
483 | struct net_device *orig_dev); | |
1da177e4 | 484 | |
b05e1066 PM |
485 | extern int ip6_rcv_finish(struct sk_buff *skb); |
486 | ||
1da177e4 LT |
487 | /* |
488 | * upper-layer output functions | |
489 | */ | |
490 | extern int ip6_xmit(struct sock *sk, | |
491 | struct sk_buff *skb, | |
4c9483b2 | 492 | struct flowi6 *fl6, |
b903d324 ED |
493 | struct ipv6_txoptions *opt, |
494 | int tclass); | |
1da177e4 LT |
495 | |
496 | extern int ip6_nd_hdr(struct sock *sk, | |
497 | struct sk_buff *skb, | |
498 | struct net_device *dev, | |
9acd9f3a YH |
499 | const struct in6_addr *saddr, |
500 | const struct in6_addr *daddr, | |
1da177e4 LT |
501 | int proto, int len); |
502 | ||
503 | extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); | |
504 | ||
505 | extern int ip6_append_data(struct sock *sk, | |
506 | int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), | |
507 | void *from, | |
508 | int length, | |
509 | int transhdrlen, | |
510 | int hlimit, | |
41a1f8ea | 511 | int tclass, |
1da177e4 | 512 | struct ipv6_txoptions *opt, |
4c9483b2 | 513 | struct flowi6 *fl6, |
1da177e4 | 514 | struct rt6_info *rt, |
13b52cd4 BH |
515 | unsigned int flags, |
516 | int dontfrag); | |
1da177e4 LT |
517 | |
518 | extern int ip6_push_pending_frames(struct sock *sk); | |
519 | ||
520 | extern void ip6_flush_pending_frames(struct sock *sk); | |
521 | ||
522 | extern int ip6_dst_lookup(struct sock *sk, | |
523 | struct dst_entry **dst, | |
4c9483b2 | 524 | struct flowi6 *fl6); |
68d0c6d3 | 525 | extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk, |
4c9483b2 | 526 | struct flowi6 *fl6, |
68d0c6d3 | 527 | const struct in6_addr *final_dst, |
a1414715 | 528 | bool can_sleep); |
68d0c6d3 | 529 | extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk, |
4c9483b2 | 530 | struct flowi6 *fl6, |
68d0c6d3 | 531 | const struct in6_addr *final_dst, |
a1414715 | 532 | bool can_sleep); |
2774c131 DM |
533 | extern struct dst_entry * ip6_blackhole_route(struct net *net, |
534 | struct dst_entry *orig_dst); | |
1da177e4 LT |
535 | |
536 | /* | |
537 | * skb processing functions | |
538 | */ | |
539 | ||
540 | extern int ip6_output(struct sk_buff *skb); | |
541 | extern int ip6_forward(struct sk_buff *skb); | |
542 | extern int ip6_input(struct sk_buff *skb); | |
543 | extern int ip6_mc_input(struct sk_buff *skb); | |
544 | ||
ef76bc23 HX |
545 | extern int __ip6_local_out(struct sk_buff *skb); |
546 | extern int ip6_local_out(struct sk_buff *skb); | |
547 | ||
1da177e4 LT |
548 | /* |
549 | * Extension header (options) processing | |
550 | */ | |
551 | ||
1da177e4 LT |
552 | extern void ipv6_push_nfrag_opts(struct sk_buff *skb, |
553 | struct ipv6_txoptions *opt, | |
554 | u8 *proto, | |
555 | struct in6_addr **daddr_p); | |
556 | extern void ipv6_push_frag_opts(struct sk_buff *skb, | |
557 | struct ipv6_txoptions *opt, | |
558 | u8 *proto); | |
559 | ||
560 | extern int ipv6_skip_exthdr(const struct sk_buff *, int start, | |
75f2811c | 561 | u8 *nexthdrp, __be16 *frag_offp); |
1da177e4 LT |
562 | |
563 | extern int ipv6_ext_hdr(u8 nexthdr); | |
564 | ||
c61a4043 MN |
565 | extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); |
566 | ||
4c9483b2 | 567 | extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6, |
20c59de2 AE |
568 | const struct ipv6_txoptions *opt, |
569 | struct in6_addr *orig); | |
570 | ||
1da177e4 LT |
571 | /* |
572 | * socket options (ipv6_sockglue.c) | |
573 | */ | |
574 | ||
575 | extern int ipv6_setsockopt(struct sock *sk, int level, | |
576 | int optname, | |
577 | char __user *optval, | |
b7058842 | 578 | unsigned int optlen); |
1da177e4 LT |
579 | extern int ipv6_getsockopt(struct sock *sk, int level, |
580 | int optname, | |
581 | char __user *optval, | |
582 | int __user *optlen); | |
3fdadf7d DM |
583 | extern int compat_ipv6_setsockopt(struct sock *sk, |
584 | int level, | |
585 | int optname, | |
586 | char __user *optval, | |
b7058842 | 587 | unsigned int optlen); |
3fdadf7d DM |
588 | extern int compat_ipv6_getsockopt(struct sock *sk, |
589 | int level, | |
590 | int optname, | |
591 | char __user *optval, | |
592 | int __user *optlen); | |
1da177e4 | 593 | |
1da177e4 LT |
594 | extern int ip6_datagram_connect(struct sock *sk, |
595 | struct sockaddr *addr, int addr_len); | |
596 | ||
597 | extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); | |
4b340ae2 | 598 | extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len); |
e69a4adc | 599 | extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, |
1da177e4 | 600 | u32 info, u8 *payload); |
4c9483b2 DM |
601 | extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); |
602 | extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); | |
1da177e4 LT |
603 | |
604 | extern int inet6_release(struct socket *sock); | |
605 | extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, | |
606 | int addr_len); | |
607 | extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, | |
608 | int *uaddr_len, int peer); | |
609 | extern int inet6_ioctl(struct socket *sock, unsigned int cmd, | |
610 | unsigned long arg); | |
611 | ||
d8313f5c ACM |
612 | extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, |
613 | struct sock *sk); | |
614 | ||
1da177e4 LT |
615 | /* |
616 | * reassembly.c | |
617 | */ | |
90ddc4f0 ED |
618 | extern const struct proto_ops inet6_stream_ops; |
619 | extern const struct proto_ops inet6_dgram_ops; | |
20380731 | 620 | |
14c85021 ACM |
621 | struct group_source_req; |
622 | struct group_filter; | |
623 | ||
20380731 ACM |
624 | extern int ip6_mc_source(int add, int omode, struct sock *sk, |
625 | struct group_source_req *pgsr); | |
626 | extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); | |
627 | extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, | |
628 | struct group_filter __user *optval, | |
629 | int __user *optlen); | |
93c8b90f IJ |
630 | extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr, |
631 | const struct in6_addr *daddr, u32 rnd); | |
20380731 ACM |
632 | |
633 | #ifdef CONFIG_PROC_FS | |
6ab57e7e DL |
634 | extern int ac6_proc_init(struct net *net); |
635 | extern void ac6_proc_exit(struct net *net); | |
20380731 ACM |
636 | extern int raw6_proc_init(void); |
637 | extern void raw6_proc_exit(void); | |
6f8b13bc DL |
638 | extern int tcp6_proc_init(struct net *net); |
639 | extern void tcp6_proc_exit(struct net *net); | |
0c96d8c5 DL |
640 | extern int udp6_proc_init(struct net *net); |
641 | extern void udp6_proc_exit(struct net *net); | |
ba4e58ec GR |
642 | extern int udplite6_proc_init(void); |
643 | extern void udplite6_proc_exit(void); | |
20380731 ACM |
644 | extern int ipv6_misc_proc_init(void); |
645 | extern void ipv6_misc_proc_exit(void); | |
7f7d9a6b HX |
646 | extern int snmp6_register_dev(struct inet6_dev *idev); |
647 | extern int snmp6_unregister_dev(struct inet6_dev *idev); | |
20380731 | 648 | |
7f7d9a6b | 649 | #else |
6ab57e7e DL |
650 | static inline int ac6_proc_init(struct net *net) { return 0; } |
651 | static inline void ac6_proc_exit(struct net *net) { } | |
652 | static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } | |
653 | static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } | |
20380731 | 654 | #endif |
1da177e4 | 655 | |
20380731 | 656 | #ifdef CONFIG_SYSCTL |
760f2d01 DL |
657 | extern ctl_table ipv6_route_table_template[]; |
658 | extern ctl_table ipv6_icmp_table_template[]; | |
1da177e4 | 659 | |
6de1a910 DL |
660 | extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); |
661 | extern struct ctl_table *ipv6_route_sysctl_init(struct net *net); | |
291480c0 | 662 | extern int ipv6_sysctl_register(void); |
20380731 | 663 | extern void ipv6_sysctl_unregister(void); |
eeb61f71 AV |
664 | extern int ipv6_static_sysctl_register(void); |
665 | extern void ipv6_static_sysctl_unregister(void); | |
20380731 | 666 | #endif |
1da177e4 | 667 | |
20380731 | 668 | #endif /* _NET_IPV6_H */ |