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Commit | Line | Data |
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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> | |
08dcdbf6 | 18 | #include <linux/jhash.h> |
20283d84 | 19 | #include <net/if_inet6.h> |
1da177e4 LT |
20 | #include <net/ndisc.h> |
21 | #include <net/flow.h> | |
22 | #include <net/snmp.h> | |
23 | ||
24 | #define SIN6_LEN_RFC2133 24 | |
25 | ||
26 | #define IPV6_MAXPLEN 65535 | |
27 | ||
28 | /* | |
29 | * NextHeader field of IPv6 header | |
30 | */ | |
31 | ||
32 | #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */ | |
33 | #define NEXTHDR_TCP 6 /* TCP segment. */ | |
34 | #define NEXTHDR_UDP 17 /* UDP message. */ | |
35 | #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */ | |
36 | #define NEXTHDR_ROUTING 43 /* Routing header. */ | |
37 | #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */ | |
c12b395a | 38 | #define NEXTHDR_GRE 47 /* GRE header. */ |
1da177e4 LT |
39 | #define NEXTHDR_ESP 50 /* Encapsulating security payload. */ |
40 | #define NEXTHDR_AUTH 51 /* Authentication header. */ | |
41 | #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ | |
42 | #define NEXTHDR_NONE 59 /* No next header */ | |
43 | #define NEXTHDR_DEST 60 /* Destination options header. */ | |
280c571e | 44 | #define NEXTHDR_SCTP 132 /* SCTP message. */ |
2b741653 | 45 | #define NEXTHDR_MOBILITY 135 /* Mobility header. */ |
1da177e4 LT |
46 | |
47 | #define NEXTHDR_MAX 255 | |
48 | ||
49 | ||
50 | ||
51 | #define IPV6_DEFAULT_HOPLIMIT 64 | |
52 | #define IPV6_DEFAULT_MCASTHOPS 1 | |
53 | ||
54 | /* | |
55 | * Addr type | |
56 | * | |
57 | * type - unicast | multicast | |
58 | * scope - local | site | global | |
59 | * v4 - compat | |
60 | * v4mapped | |
61 | * any | |
62 | * loopback | |
63 | */ | |
64 | ||
65 | #define IPV6_ADDR_ANY 0x0000U | |
66 | ||
67 | #define IPV6_ADDR_UNICAST 0x0001U | |
68 | #define IPV6_ADDR_MULTICAST 0x0002U | |
69 | ||
70 | #define IPV6_ADDR_LOOPBACK 0x0010U | |
71 | #define IPV6_ADDR_LINKLOCAL 0x0020U | |
72 | #define IPV6_ADDR_SITELOCAL 0x0040U | |
73 | ||
74 | #define IPV6_ADDR_COMPATv4 0x0080U | |
75 | ||
76 | #define IPV6_ADDR_SCOPE_MASK 0x00f0U | |
77 | ||
78 | #define IPV6_ADDR_MAPPED 0x1000U | |
1da177e4 LT |
79 | |
80 | /* | |
81 | * Addr scopes | |
82 | */ | |
1da177e4 LT |
83 | #define IPV6_ADDR_MC_SCOPE(a) \ |
84 | ((a)->s6_addr[1] & 0x0f) /* nonstandard */ | |
85 | #define __IPV6_ADDR_SCOPE_INVALID -1 | |
1da177e4 LT |
86 | #define IPV6_ADDR_SCOPE_NODELOCAL 0x01 |
87 | #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 | |
88 | #define IPV6_ADDR_SCOPE_SITELOCAL 0x05 | |
89 | #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 | |
90 | #define IPV6_ADDR_SCOPE_GLOBAL 0x0e | |
91 | ||
5ced1339 LL |
92 | /* |
93 | * Addr flags | |
94 | */ | |
5ced1339 LL |
95 | #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \ |
96 | ((a)->s6_addr[1] & 0x10) | |
97 | #define IPV6_ADDR_MC_FLAG_PREFIX(a) \ | |
98 | ((a)->s6_addr[1] & 0x20) | |
99 | #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \ | |
100 | ((a)->s6_addr[1] & 0x40) | |
5ced1339 | 101 | |
1da177e4 LT |
102 | /* |
103 | * fragmentation header | |
104 | */ | |
105 | ||
106 | struct frag_hdr { | |
44473a6b AV |
107 | __u8 nexthdr; |
108 | __u8 reserved; | |
109 | __be16 frag_off; | |
110 | __be32 identification; | |
1da177e4 LT |
111 | }; |
112 | ||
113 | #define IP6_MF 0x0001 | |
114 | ||
1da177e4 LT |
115 | #include <net/sock.h> |
116 | ||
117 | /* sysctls */ | |
1da177e4 | 118 | extern int sysctl_mld_max_msf; |
3d7cc2ba | 119 | |
087fe240 | 120 | #define _DEVINC(net, statname, modifier, idev, field) \ |
14878f75 | 121 | ({ \ |
a11d206d YH |
122 | struct inet6_dev *_idev = (idev); \ |
123 | if (likely(_idev != NULL)) \ | |
14878f75 | 124 | SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \ |
9261e537 | 125 | SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ |
a11d206d | 126 | }) |
14878f75 | 127 | |
be281e55 ED |
128 | /* per device counters are atomic_long_t */ |
129 | #define _DEVINCATOMIC(net, statname, modifier, idev, field) \ | |
130 | ({ \ | |
131 | struct inet6_dev *_idev = (idev); \ | |
132 | if (likely(_idev != NULL)) \ | |
133 | SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ | |
134 | SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ | |
135 | }) | |
136 | ||
2a24444f ED |
137 | /* per device and per net counters are atomic_long_t */ |
138 | #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ | |
139 | ({ \ | |
140 | struct inet6_dev *_idev = (idev); \ | |
141 | if (likely(_idev != NULL)) \ | |
142 | SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ | |
143 | SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ | |
144 | }) | |
145 | ||
087fe240 | 146 | #define _DEVADD(net, statname, modifier, idev, field, val) \ |
8e7999c4 PE |
147 | ({ \ |
148 | struct inet6_dev *_idev = (idev); \ | |
149 | if (likely(_idev != NULL)) \ | |
150 | SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ | |
9261e537 | 151 | SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\ |
8e7999c4 PE |
152 | }) |
153 | ||
edf391ff NH |
154 | #define _DEVUPD(net, statname, modifier, idev, field, val) \ |
155 | ({ \ | |
156 | struct inet6_dev *_idev = (idev); \ | |
157 | if (likely(_idev != NULL)) \ | |
158 | SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \ | |
159 | SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\ | |
160 | }) | |
161 | ||
14878f75 | 162 | /* MIBs */ |
14878f75 | 163 | |
087fe240 | 164 | #define IP6_INC_STATS(net, idev,field) \ |
4ce3c183 | 165 | _DEVINC(net, ipv6, 64, idev, field) |
087fe240 | 166 | #define IP6_INC_STATS_BH(net, idev,field) \ |
4ce3c183 | 167 | _DEVINC(net, ipv6, 64_BH, idev, field) |
edf391ff | 168 | #define IP6_ADD_STATS(net, idev,field,val) \ |
4ce3c183 | 169 | _DEVADD(net, ipv6, 64, idev, field, val) |
087fe240 | 170 | #define IP6_ADD_STATS_BH(net, idev,field,val) \ |
4ce3c183 | 171 | _DEVADD(net, ipv6, 64_BH, idev, field, val) |
edf391ff | 172 | #define IP6_UPD_PO_STATS(net, idev,field,val) \ |
4ce3c183 | 173 | _DEVUPD(net, ipv6, 64, idev, field, val) |
edf391ff | 174 | #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \ |
4ce3c183 | 175 | _DEVUPD(net, ipv6, 64_BH, idev, field, val) |
087fe240 | 176 | #define ICMP6_INC_STATS(net, idev, field) \ |
be281e55 | 177 | _DEVINCATOMIC(net, icmpv6, , idev, field) |
087fe240 | 178 | #define ICMP6_INC_STATS_BH(net, idev, field) \ |
be281e55 | 179 | _DEVINCATOMIC(net, icmpv6, _BH, idev, field) |
087fe240 DL |
180 | |
181 | #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ | |
2a24444f | 182 | _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) |
087fe240 | 183 | #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \ |
2a24444f | 184 | _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) |
087fe240 | 185 | #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \ |
2a24444f | 186 | _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) |
14878f75 | 187 | |
fd2c3ef7 | 188 | struct ip6_ra_chain { |
1da177e4 LT |
189 | struct ip6_ra_chain *next; |
190 | struct sock *sk; | |
191 | int sel; | |
192 | void (*destructor)(struct sock *); | |
193 | }; | |
194 | ||
195 | extern struct ip6_ra_chain *ip6_ra_chain; | |
196 | extern rwlock_t ip6_ra_lock; | |
197 | ||
198 | /* | |
199 | This structure is prepared by protocol, when parsing | |
200 | ancillary data and passed to IPv6. | |
201 | */ | |
202 | ||
fd2c3ef7 | 203 | struct ipv6_txoptions { |
1da177e4 LT |
204 | /* Length of this structure */ |
205 | int tot_len; | |
206 | ||
207 | /* length of extension headers */ | |
208 | ||
209 | __u16 opt_flen; /* after fragment hdr */ | |
210 | __u16 opt_nflen; /* before fragment hdr */ | |
211 | ||
212 | struct ipv6_opt_hdr *hopopt; | |
213 | struct ipv6_opt_hdr *dst0opt; | |
214 | struct ipv6_rt_hdr *srcrt; /* Routing Header */ | |
1da177e4 LT |
215 | struct ipv6_opt_hdr *dst1opt; |
216 | ||
217 | /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ | |
218 | }; | |
219 | ||
fd2c3ef7 | 220 | struct ip6_flowlabel { |
7f0e44ac | 221 | struct ip6_flowlabel __rcu *next; |
90bcaf7b | 222 | __be32 label; |
db3459d1 | 223 | atomic_t users; |
1da177e4 LT |
224 | struct in6_addr dst; |
225 | struct ipv6_txoptions *opt; | |
1da177e4 | 226 | unsigned long linger; |
d3aedd5e | 227 | struct rcu_head rcu; |
1da177e4 | 228 | u8 share; |
4f82f457 EB |
229 | union { |
230 | struct pid *pid; | |
231 | kuid_t uid; | |
232 | } owner; | |
1da177e4 LT |
233 | unsigned long lastuse; |
234 | unsigned long expires; | |
60e8fbc4 | 235 | struct net *fl_net; |
1da177e4 LT |
236 | }; |
237 | ||
f3a7c66b HH |
238 | #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) |
239 | #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) | |
1da177e4 | 240 | |
fd2c3ef7 | 241 | struct ipv6_fl_socklist { |
7f0e44ac ED |
242 | struct ipv6_fl_socklist __rcu *next; |
243 | struct ip6_flowlabel *fl; | |
244 | struct rcu_head rcu; | |
1da177e4 LT |
245 | }; |
246 | ||
5c3a0fd7 JP |
247 | struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); |
248 | struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, | |
249 | struct ip6_flowlabel *fl, | |
250 | struct ipv6_txoptions *fopt); | |
251 | void fl6_free_socklist(struct sock *sk); | |
252 | int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); | |
3fdfa5ff | 253 | int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq); |
5c3a0fd7 JP |
254 | int ip6_flowlabel_init(void); |
255 | void ip6_flowlabel_cleanup(void); | |
1da177e4 LT |
256 | |
257 | static inline void fl6_sock_release(struct ip6_flowlabel *fl) | |
258 | { | |
259 | if (fl) | |
260 | atomic_dec(&fl->users); | |
261 | } | |
262 | ||
5c3a0fd7 | 263 | void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); |
b94f1c09 | 264 | |
6d0bfe22 LC |
265 | int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, |
266 | struct icmp6hdr *thdr, int len); | |
267 | ||
268 | struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb, | |
269 | struct sock *sk, struct flowi6 *fl6); | |
270 | ||
5c3a0fd7 | 271 | int ip6_ra_control(struct sock *sk, int sel); |
1da177e4 | 272 | |
5c3a0fd7 | 273 | int ipv6_parse_hopopts(struct sk_buff *skb); |
1da177e4 | 274 | |
5c3a0fd7 JP |
275 | struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, |
276 | struct ipv6_txoptions *opt); | |
277 | struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, | |
278 | struct ipv6_txoptions *opt, | |
279 | int newtype, | |
280 | struct ipv6_opt_hdr __user *newopt, | |
281 | int newoptlen); | |
df9890c3 YH |
282 | struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
283 | struct ipv6_txoptions *opt); | |
1da177e4 | 284 | |
5c3a0fd7 | 285 | bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb); |
399c07de | 286 | |
aeaf6e9d SL |
287 | static inline bool ipv6_accept_ra(struct inet6_dev *idev) |
288 | { | |
289 | /* If forwarding is enabled, RA are not accepted unless the special | |
290 | * hybrid mode (accept_ra=2) is enabled. | |
291 | */ | |
292 | return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : | |
293 | idev->cnf.accept_ra; | |
294 | } | |
295 | ||
d4915c08 AW |
296 | #if IS_ENABLED(CONFIG_IPV6) |
297 | static inline int ip6_frag_nqueues(struct net *net) | |
298 | { | |
299 | return net->ipv6.frags.nqueues; | |
300 | } | |
301 | ||
302 | static inline int ip6_frag_mem(struct net *net) | |
303 | { | |
d433673e | 304 | return sum_frag_mem_limit(&net->ipv6.frags); |
d4915c08 AW |
305 | } |
306 | #endif | |
1da177e4 | 307 | |
c2a93660 JDB |
308 | #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ |
309 | #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ | |
9874c41c | 310 | #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ |
1da177e4 | 311 | |
5c3a0fd7 | 312 | int __ipv6_addr_type(const struct in6_addr *addr); |
b1cacb68 YH |
313 | static inline int ipv6_addr_type(const struct in6_addr *addr) |
314 | { | |
315 | return __ipv6_addr_type(addr) & 0xffff; | |
316 | } | |
1da177e4 LT |
317 | |
318 | static inline int ipv6_addr_scope(const struct in6_addr *addr) | |
319 | { | |
b1cacb68 YH |
320 | return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; |
321 | } | |
322 | ||
323 | static inline int __ipv6_addr_src_scope(int type) | |
324 | { | |
a02cec21 | 325 | return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); |
b1cacb68 YH |
326 | } |
327 | ||
328 | static inline int ipv6_addr_src_scope(const struct in6_addr *addr) | |
329 | { | |
330 | return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); | |
1da177e4 LT |
331 | } |
332 | ||
b7ef213e HFS |
333 | static inline bool __ipv6_addr_needs_scope_id(int type) |
334 | { | |
335 | return type & IPV6_ADDR_LINKLOCAL || | |
336 | (type & IPV6_ADDR_MULTICAST && | |
337 | (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); | |
338 | } | |
339 | ||
340 | static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) | |
341 | { | |
342 | return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; | |
343 | } | |
344 | ||
1da177e4 LT |
345 | static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) |
346 | { | |
db3459d1 | 347 | return memcmp(a1, a2, sizeof(struct in6_addr)); |
1da177e4 LT |
348 | } |
349 | ||
1a203cb3 | 350 | static inline bool |
f2ffd9ee PM |
351 | ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, |
352 | const struct in6_addr *a2) | |
353 | { | |
1a203cb3 ED |
354 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
355 | const unsigned long *ul1 = (const unsigned long *)a1; | |
356 | const unsigned long *ulm = (const unsigned long *)m; | |
357 | const unsigned long *ul2 = (const unsigned long *)a2; | |
358 | ||
359 | return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | | |
360 | ((ul1[1] ^ ul2[1]) & ulm[1])); | |
361 | #else | |
a02cec21 ED |
362 | return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | |
363 | ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | | |
364 | ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | | |
365 | ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); | |
1a203cb3 | 366 | #endif |
f2ffd9ee PM |
367 | } |
368 | ||
1da177e4 LT |
369 | static inline void ipv6_addr_prefix(struct in6_addr *pfx, |
370 | const struct in6_addr *addr, | |
371 | int plen) | |
372 | { | |
373 | /* caller must guarantee 0 <= plen <= 128 */ | |
374 | int o = plen >> 3, | |
375 | b = plen & 0x7; | |
376 | ||
db3459d1 | 377 | memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); |
1da177e4 | 378 | memcpy(pfx->s6_addr, addr, o); |
db3459d1 | 379 | if (b != 0) |
1da177e4 | 380 | pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); |
1da177e4 LT |
381 | } |
382 | ||
5206c579 YH |
383 | static inline void __ipv6_addr_set_half(__be32 *addr, |
384 | __be32 wh, __be32 wl) | |
385 | { | |
386 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 | |
387 | #if defined(__BIG_ENDIAN) | |
388 | if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { | |
389 | *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); | |
390 | return; | |
391 | } | |
392 | #elif defined(__LITTLE_ENDIAN) | |
393 | if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { | |
394 | *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); | |
395 | return; | |
396 | } | |
397 | #endif | |
398 | #endif | |
399 | addr[0] = wh; | |
400 | addr[1] = wl; | |
401 | } | |
402 | ||
1da177e4 | 403 | static inline void ipv6_addr_set(struct in6_addr *addr, |
48818f82 AV |
404 | __be32 w1, __be32 w2, |
405 | __be32 w3, __be32 w4) | |
1da177e4 | 406 | { |
5206c579 YH |
407 | __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); |
408 | __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); | |
1da177e4 | 409 | } |
1da177e4 | 410 | |
92113bfd ED |
411 | static inline bool ipv6_addr_equal(const struct in6_addr *a1, |
412 | const struct in6_addr *a2) | |
1da177e4 | 413 | { |
1a203cb3 ED |
414 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
415 | const unsigned long *ul1 = (const unsigned long *)a1; | |
416 | const unsigned long *ul2 = (const unsigned long *)a2; | |
417 | ||
418 | return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; | |
419 | #else | |
a02cec21 ED |
420 | return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | |
421 | (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | | |
422 | (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | | |
423 | (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; | |
1a203cb3 | 424 | #endif |
1da177e4 LT |
425 | } |
426 | ||
38675170 YH |
427 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
428 | static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, | |
429 | const __be64 *a2, | |
430 | unsigned int len) | |
431 | { | |
512613d7 | 432 | if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) |
38675170 YH |
433 | return false; |
434 | return true; | |
435 | } | |
436 | ||
437 | static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, | |
438 | const struct in6_addr *addr2, | |
439 | unsigned int prefixlen) | |
440 | { | |
441 | const __be64 *a1 = (const __be64 *)addr1; | |
442 | const __be64 *a2 = (const __be64 *)addr2; | |
443 | ||
444 | if (prefixlen >= 64) { | |
445 | if (a1[0] ^ a2[0]) | |
446 | return false; | |
447 | return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); | |
448 | } | |
449 | return __ipv6_prefix_equal64_half(a1, a2, prefixlen); | |
450 | } | |
451 | #else | |
2ef97332 YH |
452 | static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, |
453 | const struct in6_addr *addr2, | |
454 | unsigned int prefixlen) | |
1da177e4 | 455 | { |
2ef97332 YH |
456 | const __be32 *a1 = addr1->s6_addr32; |
457 | const __be32 *a2 = addr2->s6_addr32; | |
95c96174 | 458 | unsigned int pdw, pbi; |
1da177e4 LT |
459 | |
460 | /* check complete u32 in prefix */ | |
461 | pdw = prefixlen >> 5; | |
462 | if (pdw && memcmp(a1, a2, pdw << 2)) | |
92113bfd | 463 | return false; |
1da177e4 LT |
464 | |
465 | /* check incomplete u32 in prefix */ | |
466 | pbi = prefixlen & 0x1f; | |
467 | if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) | |
92113bfd | 468 | return false; |
1da177e4 | 469 | |
92113bfd | 470 | return true; |
1da177e4 | 471 | } |
38675170 | 472 | #endif |
1da177e4 | 473 | |
2588fe1d | 474 | struct inet_frag_queue; |
2588fe1d | 475 | |
0b5ccb2e PM |
476 | enum ip6_defrag_users { |
477 | IP6_DEFRAG_LOCAL_DELIVER, | |
478 | IP6_DEFRAG_CONNTRACK_IN, | |
4be929be | 479 | __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
0b5ccb2e | 480 | IP6_DEFRAG_CONNTRACK_OUT, |
4be929be | 481 | __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
8fa9ff68 | 482 | IP6_DEFRAG_CONNTRACK_BRIDGE_IN, |
4be929be | 483 | __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
0b5ccb2e PM |
484 | }; |
485 | ||
c6fda282 PE |
486 | struct ip6_create_arg { |
487 | __be32 id; | |
0b5ccb2e | 488 | u32 user; |
b71d1d42 ED |
489 | const struct in6_addr *src; |
490 | const struct in6_addr *dst; | |
eec2e618 | 491 | u8 ecn; |
c6fda282 PE |
492 | }; |
493 | ||
494 | void ip6_frag_init(struct inet_frag_queue *q, void *a); | |
cbc264ca | 495 | bool ip6_frag_match(struct inet_frag_queue *q, void *a); |
c6fda282 | 496 | |
b836c99f AW |
497 | /* |
498 | * Equivalent of ipv4 struct ip | |
499 | */ | |
500 | struct frag_queue { | |
501 | struct inet_frag_queue q; | |
502 | ||
503 | __be32 id; /* fragment id */ | |
504 | u32 user; | |
505 | struct in6_addr saddr; | |
506 | struct in6_addr daddr; | |
507 | ||
508 | int iif; | |
509 | unsigned int csum; | |
510 | __u16 nhoffset; | |
eec2e618 | 511 | u8 ecn; |
b836c99f AW |
512 | }; |
513 | ||
514 | void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, | |
515 | struct inet_frags *frags); | |
516 | ||
92113bfd | 517 | static inline bool ipv6_addr_any(const struct in6_addr *a) |
1da177e4 | 518 | { |
1a203cb3 ED |
519 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
520 | const unsigned long *ul = (const unsigned long *)a; | |
521 | ||
522 | return (ul[0] | ul[1]) == 0UL; | |
523 | #else | |
a02cec21 ED |
524 | return (a->s6_addr32[0] | a->s6_addr32[1] | |
525 | a->s6_addr32[2] | a->s6_addr32[3]) == 0; | |
1a203cb3 | 526 | #endif |
1da177e4 LT |
527 | } |
528 | ||
ddbe5032 ED |
529 | static inline u32 ipv6_addr_hash(const struct in6_addr *a) |
530 | { | |
531 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 | |
532 | const unsigned long *ul = (const unsigned long *)a; | |
533 | unsigned long x = ul[0] ^ ul[1]; | |
534 | ||
535 | return (u32)(x ^ (x >> 32)); | |
536 | #else | |
537 | return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ | |
538 | a->s6_addr32[2] ^ a->s6_addr32[3]); | |
539 | #endif | |
540 | } | |
541 | ||
08dcdbf6 | 542 | /* more secured version of ipv6_addr_hash() */ |
b50026b5 | 543 | static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) |
08dcdbf6 ED |
544 | { |
545 | u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1]; | |
546 | ||
547 | return jhash_3words(v, | |
548 | (__force u32)a->s6_addr32[2], | |
549 | (__force u32)a->s6_addr32[3], | |
b50026b5 | 550 | initval); |
08dcdbf6 ED |
551 | } |
552 | ||
92113bfd | 553 | static inline bool ipv6_addr_loopback(const struct in6_addr *a) |
f630e43a | 554 | { |
e287656b YH |
555 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
556 | const unsigned long *ul = (const unsigned long *)a; | |
557 | ||
558 | return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL; | |
559 | #else | |
a02cec21 ED |
560 | return (a->s6_addr32[0] | a->s6_addr32[1] | |
561 | a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0; | |
e287656b | 562 | #endif |
f630e43a YH |
563 | } |
564 | ||
92113bfd | 565 | static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) |
e773e4fa | 566 | { |
a04d40b8 YH |
567 | return ( |
568 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 | |
569 | *(__be64 *)a | | |
570 | #else | |
571 | (a->s6_addr32[0] | a->s6_addr32[1]) | | |
572 | #endif | |
573 | (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL; | |
e773e4fa BH |
574 | } |
575 | ||
99cd07a5 JMT |
576 | /* |
577 | * Check for a RFC 4843 ORCHID address | |
578 | * (Overlay Routable Cryptographic Hash Identifiers) | |
579 | */ | |
92113bfd | 580 | static inline bool ipv6_addr_orchid(const struct in6_addr *a) |
99cd07a5 | 581 | { |
a02cec21 | 582 | return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); |
99cd07a5 JMT |
583 | } |
584 | ||
f15364bd AC |
585 | static inline void ipv6_addr_set_v4mapped(const __be32 addr, |
586 | struct in6_addr *v4mapped) | |
587 | { | |
588 | ipv6_addr_set(v4mapped, | |
589 | 0, 0, | |
590 | htonl(0x0000FFFF), | |
591 | addr); | |
592 | } | |
593 | ||
971f359d YH |
594 | /* |
595 | * find the first different bit between two addresses | |
596 | * length of address must be a multiple of 32bits | |
597 | */ | |
9f2e7334 | 598 | static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) |
971f359d | 599 | { |
ef296f56 | 600 | const __be32 *a1 = token1, *a2 = token2; |
971f359d YH |
601 | int i; |
602 | ||
603 | addrlen >>= 2; | |
604 | ||
605 | for (i = 0; i < addrlen; i++) { | |
ef296f56 AV |
606 | __be32 xb = a1[i] ^ a2[i]; |
607 | if (xb) | |
d57b8fb8 | 608 | return i * 32 + 31 - __fls(ntohl(xb)); |
971f359d YH |
609 | } |
610 | ||
611 | /* | |
612 | * we should *never* get to this point since that | |
613 | * would mean the addrs are equal | |
614 | * | |
615 | * However, we do get to it 8) And exacly, when | |
616 | * addresses are equal 8) | |
617 | * | |
618 | * ip route add 1111::/128 via ... | |
619 | * ip route add 1111::/64 via ... | |
620 | * and we are here. | |
621 | * | |
622 | * Ideally, this function should stop comparison | |
623 | * at prefix length. It does not, but it is still OK, | |
624 | * if returned value is greater than prefix length. | |
625 | * --ANK (980803) | |
626 | */ | |
a02cec21 | 627 | return addrlen << 5; |
971f359d YH |
628 | } |
629 | ||
9f2e7334 YH |
630 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
631 | static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) | |
632 | { | |
633 | const __be64 *a1 = token1, *a2 = token2; | |
634 | int i; | |
635 | ||
636 | addrlen >>= 3; | |
637 | ||
638 | for (i = 0; i < addrlen; i++) { | |
639 | __be64 xb = a1[i] ^ a2[i]; | |
640 | if (xb) | |
641 | return i * 64 + 63 - __fls(be64_to_cpu(xb)); | |
642 | } | |
643 | ||
644 | return addrlen << 6; | |
645 | } | |
646 | #endif | |
647 | ||
648 | static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) | |
649 | { | |
650 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 | |
651 | if (__builtin_constant_p(addrlen) && !(addrlen & 7)) | |
652 | return __ipv6_addr_diff64(token1, token2, addrlen); | |
653 | #endif | |
654 | return __ipv6_addr_diff32(token1, token2, addrlen); | |
655 | } | |
656 | ||
971f359d YH |
657 | static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) |
658 | { | |
659 | return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); | |
660 | } | |
661 | ||
5c3a0fd7 | 662 | void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt); |
7ea2f2c5 | 663 | |
5c3a0fd7 | 664 | int ip6_dst_hoplimit(struct dst_entry *dst); |
3ce9b35f | 665 | |
3e4e4c1f YH |
666 | /* |
667 | * Header manipulation | |
668 | */ | |
669 | static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, | |
670 | __be32 flowlabel) | |
671 | { | |
07f623d3 | 672 | *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; |
3e4e4c1f YH |
673 | } |
674 | ||
6502ca52 YH |
675 | static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) |
676 | { | |
677 | return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; | |
678 | } | |
679 | ||
1da177e4 LT |
680 | /* |
681 | * Prototypes exported by ipv6 | |
682 | */ | |
683 | ||
684 | /* | |
685 | * rcv function (called from netdevice level) | |
686 | */ | |
687 | ||
5c3a0fd7 JP |
688 | int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, |
689 | struct packet_type *pt, struct net_device *orig_dev); | |
1da177e4 | 690 | |
5c3a0fd7 | 691 | int ip6_rcv_finish(struct sk_buff *skb); |
b05e1066 | 692 | |
1da177e4 LT |
693 | /* |
694 | * upper-layer output functions | |
695 | */ | |
5c3a0fd7 JP |
696 | int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, |
697 | struct ipv6_txoptions *opt, int tclass); | |
698 | ||
699 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); | |
700 | ||
701 | int ip6_append_data(struct sock *sk, | |
702 | int getfrag(void *from, char *to, int offset, int len, | |
703 | int odd, struct sk_buff *skb), | |
704 | void *from, int length, int transhdrlen, int hlimit, | |
705 | int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, | |
706 | struct rt6_info *rt, unsigned int flags, int dontfrag); | |
707 | ||
708 | int ip6_push_pending_frames(struct sock *sk); | |
709 | ||
710 | void ip6_flush_pending_frames(struct sock *sk); | |
711 | ||
712 | int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6); | |
713 | struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, | |
714 | const struct in6_addr *final_dst, | |
715 | bool can_sleep); | |
716 | struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, | |
717 | const struct in6_addr *final_dst, | |
718 | bool can_sleep); | |
719 | struct dst_entry *ip6_blackhole_route(struct net *net, | |
720 | struct dst_entry *orig_dst); | |
1da177e4 LT |
721 | |
722 | /* | |
723 | * skb processing functions | |
724 | */ | |
725 | ||
5c3a0fd7 JP |
726 | int ip6_output(struct sk_buff *skb); |
727 | int ip6_forward(struct sk_buff *skb); | |
728 | int ip6_input(struct sk_buff *skb); | |
729 | int ip6_mc_input(struct sk_buff *skb); | |
1da177e4 | 730 | |
5c3a0fd7 JP |
731 | int __ip6_local_out(struct sk_buff *skb); |
732 | int ip6_local_out(struct sk_buff *skb); | |
ef76bc23 | 733 | |
1da177e4 LT |
734 | /* |
735 | * Extension header (options) processing | |
736 | */ | |
737 | ||
5c3a0fd7 JP |
738 | void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, |
739 | u8 *proto, struct in6_addr **daddr_p); | |
740 | void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, | |
741 | u8 *proto); | |
1da177e4 | 742 | |
5c3a0fd7 JP |
743 | int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, |
744 | __be16 *frag_offp); | |
1da177e4 | 745 | |
5c3a0fd7 | 746 | bool ipv6_ext_hdr(u8 nexthdr); |
1da177e4 | 747 | |
f8f62675 | 748 | enum { |
9195bb8e AA |
749 | IP6_FH_F_FRAG = (1 << 0), |
750 | IP6_FH_F_AUTH = (1 << 1), | |
751 | IP6_FH_F_SKIP_RH = (1 << 2), | |
f8f62675 JG |
752 | }; |
753 | ||
754 | /* find specified header and get offset to it */ | |
5c3a0fd7 JP |
755 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, |
756 | unsigned short *fragoff, int *fragflg); | |
f8f62675 | 757 | |
5c3a0fd7 | 758 | int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); |
c61a4043 | 759 | |
5c3a0fd7 JP |
760 | struct in6_addr *fl6_update_dst(struct flowi6 *fl6, |
761 | const struct ipv6_txoptions *opt, | |
762 | struct in6_addr *orig); | |
20c59de2 | 763 | |
1da177e4 LT |
764 | /* |
765 | * socket options (ipv6_sockglue.c) | |
766 | */ | |
767 | ||
5c3a0fd7 JP |
768 | int ipv6_setsockopt(struct sock *sk, int level, int optname, |
769 | char __user *optval, unsigned int optlen); | |
770 | int ipv6_getsockopt(struct sock *sk, int level, int optname, | |
771 | char __user *optval, int __user *optlen); | |
772 | int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, | |
773 | char __user *optval, unsigned int optlen); | |
774 | int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, | |
775 | char __user *optval, int __user *optlen); | |
776 | ||
777 | int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len); | |
778 | ||
85fbaa75 HFS |
779 | int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, |
780 | int *addr_len); | |
781 | int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, | |
782 | int *addr_len); | |
5c3a0fd7 JP |
783 | void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, |
784 | u32 info, u8 *payload); | |
785 | void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); | |
786 | void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); | |
787 | ||
788 | int inet6_release(struct socket *sock); | |
789 | int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); | |
790 | int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, | |
791 | int peer); | |
792 | int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); | |
793 | ||
794 | int inet6_hash_connect(struct inet_timewait_death_row *death_row, | |
d8313f5c ACM |
795 | struct sock *sk); |
796 | ||
1da177e4 LT |
797 | /* |
798 | * reassembly.c | |
799 | */ | |
90ddc4f0 ED |
800 | extern const struct proto_ops inet6_stream_ops; |
801 | extern const struct proto_ops inet6_dgram_ops; | |
20380731 | 802 | |
14c85021 ACM |
803 | struct group_source_req; |
804 | struct group_filter; | |
805 | ||
5c3a0fd7 JP |
806 | int ip6_mc_source(int add, int omode, struct sock *sk, |
807 | struct group_source_req *pgsr); | |
808 | int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); | |
809 | int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, | |
810 | struct group_filter __user *optval, int __user *optlen); | |
20380731 ACM |
811 | |
812 | #ifdef CONFIG_PROC_FS | |
5c3a0fd7 JP |
813 | int ac6_proc_init(struct net *net); |
814 | void ac6_proc_exit(struct net *net); | |
815 | int raw6_proc_init(void); | |
816 | void raw6_proc_exit(void); | |
817 | int tcp6_proc_init(struct net *net); | |
818 | void tcp6_proc_exit(struct net *net); | |
819 | int udp6_proc_init(struct net *net); | |
820 | void udp6_proc_exit(struct net *net); | |
821 | int udplite6_proc_init(void); | |
822 | void udplite6_proc_exit(void); | |
823 | int ipv6_misc_proc_init(void); | |
824 | void ipv6_misc_proc_exit(void); | |
825 | int snmp6_register_dev(struct inet6_dev *idev); | |
826 | int snmp6_unregister_dev(struct inet6_dev *idev); | |
20380731 | 827 | |
7f7d9a6b | 828 | #else |
6ab57e7e DL |
829 | static inline int ac6_proc_init(struct net *net) { return 0; } |
830 | static inline void ac6_proc_exit(struct net *net) { } | |
831 | static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } | |
832 | static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } | |
20380731 | 833 | #endif |
1da177e4 | 834 | |
20380731 | 835 | #ifdef CONFIG_SYSCTL |
9e8cda3b JP |
836 | extern struct ctl_table ipv6_route_table_template[]; |
837 | extern struct ctl_table ipv6_icmp_table_template[]; | |
1da177e4 | 838 | |
5c3a0fd7 JP |
839 | struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); |
840 | struct ctl_table *ipv6_route_sysctl_init(struct net *net); | |
841 | int ipv6_sysctl_register(void); | |
842 | void ipv6_sysctl_unregister(void); | |
20380731 | 843 | #endif |
1da177e4 | 844 | |
20380731 | 845 | #endif /* _NET_IPV6_H */ |