Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0-or-later */
2 : /*
3 : * Linux INET6 implementation
4 : *
5 : * Authors:
6 : * Pedro Roque <roque@di.fc.ul.pt>
7 : */
8 :
9 : #ifndef _NET_IPV6_H
10 : #define _NET_IPV6_H
11 :
12 : #include <linux/ipv6.h>
13 : #include <linux/hardirq.h>
14 : #include <linux/jhash.h>
15 : #include <linux/refcount.h>
16 : #include <linux/jump_label_ratelimit.h>
17 : #include <net/if_inet6.h>
18 : #include <net/ndisc.h>
19 : #include <net/flow.h>
20 : #include <net/flow_dissector.h>
21 : #include <net/snmp.h>
22 : #include <net/netns/hash.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. */
38 : #define NEXTHDR_GRE 47 /* GRE header. */
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. */
44 : #define NEXTHDR_SCTP 132 /* SCTP message. */
45 : #define NEXTHDR_MOBILITY 135 /* Mobility header. */
46 :
47 : #define NEXTHDR_MAX 255
48 :
49 : #define IPV6_DEFAULT_HOPLIMIT 64
50 : #define IPV6_DEFAULT_MCASTHOPS 1
51 :
52 : /* Limits on Hop-by-Hop and Destination options.
53 : *
54 : * Per RFC8200 there is no limit on the maximum number or lengths of options in
55 : * Hop-by-Hop or Destination options other then the packet must fit in an MTU.
56 : * We allow configurable limits in order to mitigate potential denial of
57 : * service attacks.
58 : *
59 : * There are three limits that may be set:
60 : * - Limit the number of options in a Hop-by-Hop or Destination options
61 : * extension header
62 : * - Limit the byte length of a Hop-by-Hop or Destination options extension
63 : * header
64 : * - Disallow unknown options
65 : *
66 : * The limits are expressed in corresponding sysctls:
67 : *
68 : * ipv6.sysctl.max_dst_opts_cnt
69 : * ipv6.sysctl.max_hbh_opts_cnt
70 : * ipv6.sysctl.max_dst_opts_len
71 : * ipv6.sysctl.max_hbh_opts_len
72 : *
73 : * max_*_opts_cnt is the number of TLVs that are allowed for Destination
74 : * options or Hop-by-Hop options. If the number is less than zero then unknown
75 : * TLVs are disallowed and the number of known options that are allowed is the
76 : * absolute value. Setting the value to INT_MAX indicates no limit.
77 : *
78 : * max_*_opts_len is the length limit in bytes of a Destination or
79 : * Hop-by-Hop options extension header. Setting the value to INT_MAX
80 : * indicates no length limit.
81 : *
82 : * If a limit is exceeded when processing an extension header the packet is
83 : * silently discarded.
84 : */
85 :
86 : /* Default limits for Hop-by-Hop and Destination options */
87 : #define IP6_DEFAULT_MAX_DST_OPTS_CNT 8
88 : #define IP6_DEFAULT_MAX_HBH_OPTS_CNT 8
89 : #define IP6_DEFAULT_MAX_DST_OPTS_LEN INT_MAX /* No limit */
90 : #define IP6_DEFAULT_MAX_HBH_OPTS_LEN INT_MAX /* No limit */
91 :
92 : /*
93 : * Addr type
94 : *
95 : * type - unicast | multicast
96 : * scope - local | site | global
97 : * v4 - compat
98 : * v4mapped
99 : * any
100 : * loopback
101 : */
102 :
103 : #define IPV6_ADDR_ANY 0x0000U
104 :
105 : #define IPV6_ADDR_UNICAST 0x0001U
106 : #define IPV6_ADDR_MULTICAST 0x0002U
107 :
108 : #define IPV6_ADDR_LOOPBACK 0x0010U
109 : #define IPV6_ADDR_LINKLOCAL 0x0020U
110 : #define IPV6_ADDR_SITELOCAL 0x0040U
111 :
112 : #define IPV6_ADDR_COMPATv4 0x0080U
113 :
114 : #define IPV6_ADDR_SCOPE_MASK 0x00f0U
115 :
116 : #define IPV6_ADDR_MAPPED 0x1000U
117 :
118 : /*
119 : * Addr scopes
120 : */
121 : #define IPV6_ADDR_MC_SCOPE(a) \
122 : ((a)->s6_addr[1] & 0x0f) /* nonstandard */
123 : #define __IPV6_ADDR_SCOPE_INVALID -1
124 : #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
125 : #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
126 : #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
127 : #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
128 : #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
129 :
130 : /*
131 : * Addr flags
132 : */
133 : #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
134 : ((a)->s6_addr[1] & 0x10)
135 : #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
136 : ((a)->s6_addr[1] & 0x20)
137 : #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
138 : ((a)->s6_addr[1] & 0x40)
139 :
140 : /*
141 : * fragmentation header
142 : */
143 :
144 : struct frag_hdr {
145 : __u8 nexthdr;
146 : __u8 reserved;
147 : __be16 frag_off;
148 : __be32 identification;
149 : };
150 :
151 : #define IP6_MF 0x0001
152 : #define IP6_OFFSET 0xFFF8
153 :
154 : struct ip6_fraglist_iter {
155 : struct ipv6hdr *tmp_hdr;
156 : struct sk_buff *frag;
157 : int offset;
158 : unsigned int hlen;
159 : __be32 frag_id;
160 : u8 nexthdr;
161 : };
162 :
163 : int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr,
164 : u8 nexthdr, __be32 frag_id,
165 : struct ip6_fraglist_iter *iter);
166 : void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter);
167 :
168 : static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter)
169 : {
170 : struct sk_buff *skb = iter->frag;
171 :
172 : iter->frag = skb->next;
173 : skb_mark_not_on_list(skb);
174 :
175 : return skb;
176 : }
177 :
178 : struct ip6_frag_state {
179 : u8 *prevhdr;
180 : unsigned int hlen;
181 : unsigned int mtu;
182 : unsigned int left;
183 : int offset;
184 : int ptr;
185 : int hroom;
186 : int troom;
187 : __be32 frag_id;
188 : u8 nexthdr;
189 : };
190 :
191 : void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu,
192 : unsigned short needed_tailroom, int hdr_room, u8 *prevhdr,
193 : u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state);
194 : struct sk_buff *ip6_frag_next(struct sk_buff *skb,
195 : struct ip6_frag_state *state);
196 :
197 : #define IP6_REPLY_MARK(net, mark) \
198 : ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
199 :
200 : #include <net/sock.h>
201 :
202 : /* sysctls */
203 : extern int sysctl_mld_max_msf;
204 : extern int sysctl_mld_qrv;
205 :
206 : #define _DEVINC(net, statname, mod, idev, field) \
207 : ({ \
208 : struct inet6_dev *_idev = (idev); \
209 : if (likely(_idev != NULL)) \
210 : mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
211 : mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
212 : })
213 :
214 : /* per device counters are atomic_long_t */
215 : #define _DEVINCATOMIC(net, statname, mod, idev, field) \
216 : ({ \
217 : struct inet6_dev *_idev = (idev); \
218 : if (likely(_idev != NULL)) \
219 : SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
220 : mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
221 : })
222 :
223 : /* per device and per net counters are atomic_long_t */
224 : #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
225 : ({ \
226 : struct inet6_dev *_idev = (idev); \
227 : if (likely(_idev != NULL)) \
228 : SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
229 : SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
230 : })
231 :
232 : #define _DEVADD(net, statname, mod, idev, field, val) \
233 : ({ \
234 : struct inet6_dev *_idev = (idev); \
235 : if (likely(_idev != NULL)) \
236 : mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
237 : mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
238 : })
239 :
240 : #define _DEVUPD(net, statname, mod, idev, field, val) \
241 : ({ \
242 : struct inet6_dev *_idev = (idev); \
243 : if (likely(_idev != NULL)) \
244 : mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
245 : mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
246 : })
247 :
248 : /* MIBs */
249 :
250 : #define IP6_INC_STATS(net, idev,field) \
251 : _DEVINC(net, ipv6, , idev, field)
252 : #define __IP6_INC_STATS(net, idev,field) \
253 : _DEVINC(net, ipv6, __, idev, field)
254 : #define IP6_ADD_STATS(net, idev,field,val) \
255 : _DEVADD(net, ipv6, , idev, field, val)
256 : #define __IP6_ADD_STATS(net, idev,field,val) \
257 : _DEVADD(net, ipv6, __, idev, field, val)
258 : #define IP6_UPD_PO_STATS(net, idev,field,val) \
259 : _DEVUPD(net, ipv6, , idev, field, val)
260 : #define __IP6_UPD_PO_STATS(net, idev,field,val) \
261 : _DEVUPD(net, ipv6, __, idev, field, val)
262 : #define ICMP6_INC_STATS(net, idev, field) \
263 : _DEVINCATOMIC(net, icmpv6, , idev, field)
264 : #define __ICMP6_INC_STATS(net, idev, field) \
265 : _DEVINCATOMIC(net, icmpv6, __, idev, field)
266 :
267 : #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
268 : _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
269 : #define ICMP6MSGIN_INC_STATS(net, idev, field) \
270 : _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
271 :
272 : struct ip6_ra_chain {
273 : struct ip6_ra_chain *next;
274 : struct sock *sk;
275 : int sel;
276 : void (*destructor)(struct sock *);
277 : };
278 :
279 : extern struct ip6_ra_chain *ip6_ra_chain;
280 : extern rwlock_t ip6_ra_lock;
281 :
282 : /*
283 : This structure is prepared by protocol, when parsing
284 : ancillary data and passed to IPv6.
285 : */
286 :
287 : struct ipv6_txoptions {
288 : refcount_t refcnt;
289 : /* Length of this structure */
290 : int tot_len;
291 :
292 : /* length of extension headers */
293 :
294 : __u16 opt_flen; /* after fragment hdr */
295 : __u16 opt_nflen; /* before fragment hdr */
296 :
297 : struct ipv6_opt_hdr *hopopt;
298 : struct ipv6_opt_hdr *dst0opt;
299 : struct ipv6_rt_hdr *srcrt; /* Routing Header */
300 : struct ipv6_opt_hdr *dst1opt;
301 : struct rcu_head rcu;
302 : /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
303 : };
304 :
305 : /* flowlabel_reflect sysctl values */
306 : enum flowlabel_reflect {
307 : FLOWLABEL_REFLECT_ESTABLISHED = 1,
308 : FLOWLABEL_REFLECT_TCP_RESET = 2,
309 : FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4,
310 : };
311 :
312 : struct ip6_flowlabel {
313 : struct ip6_flowlabel __rcu *next;
314 : __be32 label;
315 : atomic_t users;
316 : struct in6_addr dst;
317 : struct ipv6_txoptions *opt;
318 : unsigned long linger;
319 : struct rcu_head rcu;
320 : u8 share;
321 : union {
322 : struct pid *pid;
323 : kuid_t uid;
324 : } owner;
325 : unsigned long lastuse;
326 : unsigned long expires;
327 : struct net *fl_net;
328 : };
329 :
330 : #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
331 : #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
332 : #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
333 :
334 : #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
335 : #define IPV6_TCLASS_SHIFT 20
336 :
337 : struct ipv6_fl_socklist {
338 : struct ipv6_fl_socklist __rcu *next;
339 : struct ip6_flowlabel *fl;
340 : struct rcu_head rcu;
341 : };
342 :
343 : struct ipcm6_cookie {
344 : struct sockcm_cookie sockc;
345 : __s16 hlimit;
346 : __s16 tclass;
347 : __s8 dontfrag;
348 : struct ipv6_txoptions *opt;
349 : __u16 gso_size;
350 : };
351 :
352 : static inline void ipcm6_init(struct ipcm6_cookie *ipc6)
353 : {
354 : *ipc6 = (struct ipcm6_cookie) {
355 : .hlimit = -1,
356 : .tclass = -1,
357 : .dontfrag = -1,
358 : };
359 : }
360 :
361 : static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6,
362 : const struct ipv6_pinfo *np)
363 : {
364 : *ipc6 = (struct ipcm6_cookie) {
365 : .hlimit = -1,
366 : .tclass = np->tclass,
367 : .dontfrag = np->dontfrag,
368 : };
369 : }
370 :
371 : static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
372 : {
373 : struct ipv6_txoptions *opt;
374 :
375 : rcu_read_lock();
376 : opt = rcu_dereference(np->opt);
377 : if (opt) {
378 : if (!refcount_inc_not_zero(&opt->refcnt))
379 : opt = NULL;
380 : else
381 : opt = rcu_pointer_handoff(opt);
382 : }
383 : rcu_read_unlock();
384 : return opt;
385 : }
386 :
387 : static inline void txopt_put(struct ipv6_txoptions *opt)
388 : {
389 : if (opt && refcount_dec_and_test(&opt->refcnt))
390 : kfree_rcu(opt, rcu);
391 : }
392 :
393 : struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label);
394 :
395 : extern struct static_key_false_deferred ipv6_flowlabel_exclusive;
396 : static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk,
397 : __be32 label)
398 : {
399 : if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key))
400 : return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT);
401 :
402 : return NULL;
403 : }
404 :
405 : struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
406 : struct ip6_flowlabel *fl,
407 : struct ipv6_txoptions *fopt);
408 : void fl6_free_socklist(struct sock *sk);
409 : int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen);
410 : int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
411 : int flags);
412 : int ip6_flowlabel_init(void);
413 : void ip6_flowlabel_cleanup(void);
414 : bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
415 :
416 : static inline void fl6_sock_release(struct ip6_flowlabel *fl)
417 : {
418 : if (fl)
419 : atomic_dec(&fl->users);
420 : }
421 :
422 : void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
423 :
424 : void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
425 : struct icmp6hdr *thdr, int len);
426 :
427 : int ip6_ra_control(struct sock *sk, int sel);
428 :
429 : int ipv6_parse_hopopts(struct sk_buff *skb);
430 :
431 : struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
432 : struct ipv6_txoptions *opt);
433 : struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
434 : struct ipv6_txoptions *opt,
435 : int newtype,
436 : struct ipv6_opt_hdr *newopt);
437 : struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
438 : struct ipv6_txoptions *opt);
439 :
440 : bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
441 : const struct inet6_skb_parm *opt);
442 : struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
443 : struct ipv6_txoptions *opt);
444 :
445 : static inline bool ipv6_accept_ra(struct inet6_dev *idev)
446 : {
447 : /* If forwarding is enabled, RA are not accepted unless the special
448 : * hybrid mode (accept_ra=2) is enabled.
449 : */
450 : return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
451 : idev->cnf.accept_ra;
452 : }
453 :
454 : #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
455 : #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
456 : #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
457 :
458 : int __ipv6_addr_type(const struct in6_addr *addr);
459 0 : static inline int ipv6_addr_type(const struct in6_addr *addr)
460 : {
461 0 : return __ipv6_addr_type(addr) & 0xffff;
462 : }
463 :
464 : static inline int ipv6_addr_scope(const struct in6_addr *addr)
465 : {
466 : return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
467 : }
468 :
469 : static inline int __ipv6_addr_src_scope(int type)
470 : {
471 : return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
472 : }
473 :
474 : static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
475 : {
476 : return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
477 : }
478 :
479 : static inline bool __ipv6_addr_needs_scope_id(int type)
480 : {
481 : return type & IPV6_ADDR_LINKLOCAL ||
482 : (type & IPV6_ADDR_MULTICAST &&
483 : (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
484 : }
485 :
486 : static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
487 : {
488 : return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
489 : }
490 :
491 0 : static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
492 : {
493 0 : return memcmp(a1, a2, sizeof(struct in6_addr));
494 : }
495 :
496 : static inline bool
497 : ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
498 : const struct in6_addr *a2)
499 : {
500 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
501 : const unsigned long *ul1 = (const unsigned long *)a1;
502 : const unsigned long *ulm = (const unsigned long *)m;
503 : const unsigned long *ul2 = (const unsigned long *)a2;
504 :
505 : return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
506 : ((ul1[1] ^ ul2[1]) & ulm[1]));
507 : #else
508 : return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
509 : ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
510 : ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
511 : ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
512 : #endif
513 : }
514 :
515 : static inline void ipv6_addr_prefix(struct in6_addr *pfx,
516 : const struct in6_addr *addr,
517 : int plen)
518 : {
519 : /* caller must guarantee 0 <= plen <= 128 */
520 : int o = plen >> 3,
521 : b = plen & 0x7;
522 :
523 : memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
524 : memcpy(pfx->s6_addr, addr, o);
525 : if (b != 0)
526 : pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
527 : }
528 :
529 : static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
530 : const struct in6_addr *pfx,
531 : int plen)
532 : {
533 : /* caller must guarantee 0 <= plen <= 128 */
534 : int o = plen >> 3,
535 : b = plen & 0x7;
536 :
537 : memcpy(addr->s6_addr, pfx, o);
538 : if (b != 0) {
539 : addr->s6_addr[o] &= ~(0xff00 >> b);
540 : addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
541 : }
542 : }
543 :
544 0 : static inline void __ipv6_addr_set_half(__be32 *addr,
545 : __be32 wh, __be32 wl)
546 : {
547 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
548 : #if defined(__BIG_ENDIAN)
549 : if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
550 : *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
551 : return;
552 : }
553 : #elif defined(__LITTLE_ENDIAN)
554 0 : if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
555 0 : *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
556 0 : return;
557 : }
558 : #endif
559 : #endif
560 0 : addr[0] = wh;
561 0 : addr[1] = wl;
562 : }
563 :
564 0 : static inline void ipv6_addr_set(struct in6_addr *addr,
565 : __be32 w1, __be32 w2,
566 : __be32 w3, __be32 w4)
567 : {
568 0 : __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
569 0 : __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
570 : }
571 :
572 0 : static inline bool ipv6_addr_equal(const struct in6_addr *a1,
573 : const struct in6_addr *a2)
574 : {
575 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
576 0 : const unsigned long *ul1 = (const unsigned long *)a1;
577 0 : const unsigned long *ul2 = (const unsigned long *)a2;
578 :
579 0 : return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
580 : #else
581 : return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
582 : (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
583 : (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
584 : (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
585 : #endif
586 : }
587 :
588 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
589 : static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
590 : const __be64 *a2,
591 : unsigned int len)
592 : {
593 : if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
594 : return false;
595 : return true;
596 : }
597 :
598 : static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
599 : const struct in6_addr *addr2,
600 : unsigned int prefixlen)
601 : {
602 : const __be64 *a1 = (const __be64 *)addr1;
603 : const __be64 *a2 = (const __be64 *)addr2;
604 :
605 : if (prefixlen >= 64) {
606 : if (a1[0] ^ a2[0])
607 : return false;
608 : return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
609 : }
610 : return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
611 : }
612 : #else
613 : static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
614 : const struct in6_addr *addr2,
615 : unsigned int prefixlen)
616 : {
617 : const __be32 *a1 = addr1->s6_addr32;
618 : const __be32 *a2 = addr2->s6_addr32;
619 : unsigned int pdw, pbi;
620 :
621 : /* check complete u32 in prefix */
622 : pdw = prefixlen >> 5;
623 : if (pdw && memcmp(a1, a2, pdw << 2))
624 : return false;
625 :
626 : /* check incomplete u32 in prefix */
627 : pbi = prefixlen & 0x1f;
628 : if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
629 : return false;
630 :
631 : return true;
632 : }
633 : #endif
634 :
635 0 : static inline bool ipv6_addr_any(const struct in6_addr *a)
636 : {
637 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
638 0 : const unsigned long *ul = (const unsigned long *)a;
639 :
640 0 : return (ul[0] | ul[1]) == 0UL;
641 : #else
642 : return (a->s6_addr32[0] | a->s6_addr32[1] |
643 : a->s6_addr32[2] | a->s6_addr32[3]) == 0;
644 : #endif
645 : }
646 :
647 0 : static inline u32 ipv6_addr_hash(const struct in6_addr *a)
648 : {
649 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
650 0 : const unsigned long *ul = (const unsigned long *)a;
651 0 : unsigned long x = ul[0] ^ ul[1];
652 :
653 0 : return (u32)(x ^ (x >> 32));
654 : #else
655 : return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
656 : a->s6_addr32[2] ^ a->s6_addr32[3]);
657 : #endif
658 : }
659 :
660 : /* more secured version of ipv6_addr_hash() */
661 : static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
662 : {
663 : u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
664 :
665 : return jhash_3words(v,
666 : (__force u32)a->s6_addr32[2],
667 : (__force u32)a->s6_addr32[3],
668 : initval);
669 : }
670 :
671 : static inline bool ipv6_addr_loopback(const struct in6_addr *a)
672 : {
673 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
674 : const __be64 *be = (const __be64 *)a;
675 :
676 : return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
677 : #else
678 : return (a->s6_addr32[0] | a->s6_addr32[1] |
679 : a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
680 : #endif
681 : }
682 :
683 : /*
684 : * Note that we must __force cast these to unsigned long to make sparse happy,
685 : * since all of the endian-annotated types are fixed size regardless of arch.
686 : */
687 0 : static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
688 : {
689 0 : return (
690 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
691 0 : *(unsigned long *)a |
692 : #else
693 : (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
694 : #endif
695 0 : (__force unsigned long)(a->s6_addr32[2] ^
696 : cpu_to_be32(0x0000ffff))) == 0UL;
697 : }
698 :
699 : static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a)
700 : {
701 : return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]);
702 : }
703 :
704 : static inline u32 ipv6_portaddr_hash(const struct net *net,
705 : const struct in6_addr *addr6,
706 : unsigned int port)
707 : {
708 : unsigned int hash, mix = net_hash_mix(net);
709 :
710 : if (ipv6_addr_any(addr6))
711 : hash = jhash_1word(0, mix);
712 : else if (ipv6_addr_v4mapped(addr6))
713 : hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
714 : else
715 : hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
716 :
717 : return hash ^ port;
718 : }
719 :
720 : /*
721 : * Check for a RFC 4843 ORCHID address
722 : * (Overlay Routable Cryptographic Hash Identifiers)
723 : */
724 : static inline bool ipv6_addr_orchid(const struct in6_addr *a)
725 : {
726 : return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
727 : }
728 :
729 : static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
730 : {
731 : return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
732 : }
733 :
734 0 : static inline void ipv6_addr_set_v4mapped(const __be32 addr,
735 : struct in6_addr *v4mapped)
736 : {
737 0 : ipv6_addr_set(v4mapped,
738 : 0, 0,
739 : htonl(0x0000FFFF),
740 : addr);
741 : }
742 :
743 : /*
744 : * find the first different bit between two addresses
745 : * length of address must be a multiple of 32bits
746 : */
747 : static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
748 : {
749 : const __be32 *a1 = token1, *a2 = token2;
750 : int i;
751 :
752 : addrlen >>= 2;
753 :
754 : for (i = 0; i < addrlen; i++) {
755 : __be32 xb = a1[i] ^ a2[i];
756 : if (xb)
757 : return i * 32 + 31 - __fls(ntohl(xb));
758 : }
759 :
760 : /*
761 : * we should *never* get to this point since that
762 : * would mean the addrs are equal
763 : *
764 : * However, we do get to it 8) And exacly, when
765 : * addresses are equal 8)
766 : *
767 : * ip route add 1111::/128 via ...
768 : * ip route add 1111::/64 via ...
769 : * and we are here.
770 : *
771 : * Ideally, this function should stop comparison
772 : * at prefix length. It does not, but it is still OK,
773 : * if returned value is greater than prefix length.
774 : * --ANK (980803)
775 : */
776 : return addrlen << 5;
777 : }
778 :
779 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
780 : static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
781 : {
782 : const __be64 *a1 = token1, *a2 = token2;
783 : int i;
784 :
785 : addrlen >>= 3;
786 :
787 : for (i = 0; i < addrlen; i++) {
788 : __be64 xb = a1[i] ^ a2[i];
789 : if (xb)
790 : return i * 64 + 63 - __fls(be64_to_cpu(xb));
791 : }
792 :
793 : return addrlen << 6;
794 : }
795 : #endif
796 :
797 : static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
798 : {
799 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
800 : if (__builtin_constant_p(addrlen) && !(addrlen & 7))
801 : return __ipv6_addr_diff64(token1, token2, addrlen);
802 : #endif
803 : return __ipv6_addr_diff32(token1, token2, addrlen);
804 : }
805 :
806 : static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
807 : {
808 : return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
809 : }
810 :
811 : __be32 ipv6_select_ident(struct net *net,
812 : const struct in6_addr *daddr,
813 : const struct in6_addr *saddr);
814 : __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
815 :
816 : int ip6_dst_hoplimit(struct dst_entry *dst);
817 :
818 : static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
819 : struct dst_entry *dst)
820 : {
821 : int hlimit;
822 :
823 : if (ipv6_addr_is_multicast(&fl6->daddr))
824 : hlimit = np->mcast_hops;
825 : else
826 : hlimit = np->hop_limit;
827 : if (hlimit < 0)
828 : hlimit = ip6_dst_hoplimit(dst);
829 : return hlimit;
830 : }
831 :
832 : /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
833 : * Equivalent to : flow->v6addrs.src = iph->saddr;
834 : * flow->v6addrs.dst = iph->daddr;
835 : */
836 : static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
837 : const struct ipv6hdr *iph)
838 : {
839 : BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
840 : offsetof(typeof(flow->addrs), v6addrs.src) +
841 : sizeof(flow->addrs.v6addrs.src));
842 : memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
843 : flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
844 : }
845 :
846 : #if IS_ENABLED(CONFIG_IPV6)
847 :
848 : static inline bool ipv6_can_nonlocal_bind(struct net *net,
849 : struct inet_sock *inet)
850 : {
851 : return net->ipv6.sysctl.ip_nonlocal_bind ||
852 : inet->freebind || inet->transparent;
853 : }
854 :
855 : /* Sysctl settings for net ipv6.auto_flowlabels */
856 : #define IP6_AUTO_FLOW_LABEL_OFF 0
857 : #define IP6_AUTO_FLOW_LABEL_OPTOUT 1
858 : #define IP6_AUTO_FLOW_LABEL_OPTIN 2
859 : #define IP6_AUTO_FLOW_LABEL_FORCED 3
860 :
861 : #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
862 :
863 : #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
864 :
865 : static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
866 : __be32 flowlabel, bool autolabel,
867 : struct flowi6 *fl6)
868 : {
869 : u32 hash;
870 :
871 : /* @flowlabel may include more than a flow label, eg, the traffic class.
872 : * Here we want only the flow label value.
873 : */
874 : flowlabel &= IPV6_FLOWLABEL_MASK;
875 :
876 : if (flowlabel ||
877 : net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
878 : (!autolabel &&
879 : net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
880 : return flowlabel;
881 :
882 : hash = skb_get_hash_flowi6(skb, fl6);
883 :
884 : /* Since this is being sent on the wire obfuscate hash a bit
885 : * to minimize possbility that any useful information to an
886 : * attacker is leaked. Only lower 20 bits are relevant.
887 : */
888 : hash = rol32(hash, 16);
889 :
890 : flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
891 :
892 : if (net->ipv6.sysctl.flowlabel_state_ranges)
893 : flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
894 :
895 : return flowlabel;
896 : }
897 :
898 : static inline int ip6_default_np_autolabel(struct net *net)
899 : {
900 : switch (net->ipv6.sysctl.auto_flowlabels) {
901 : case IP6_AUTO_FLOW_LABEL_OFF:
902 : case IP6_AUTO_FLOW_LABEL_OPTIN:
903 : default:
904 : return 0;
905 : case IP6_AUTO_FLOW_LABEL_OPTOUT:
906 : case IP6_AUTO_FLOW_LABEL_FORCED:
907 : return 1;
908 : }
909 : }
910 : #else
911 : static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
912 : __be32 flowlabel, bool autolabel,
913 : struct flowi6 *fl6)
914 : {
915 : return flowlabel;
916 : }
917 : static inline int ip6_default_np_autolabel(struct net *net)
918 : {
919 : return 0;
920 : }
921 : #endif
922 :
923 : #if IS_ENABLED(CONFIG_IPV6)
924 : static inline int ip6_multipath_hash_policy(const struct net *net)
925 : {
926 : return net->ipv6.sysctl.multipath_hash_policy;
927 : }
928 : #else
929 : static inline int ip6_multipath_hash_policy(const struct net *net)
930 : {
931 : return 0;
932 : }
933 : #endif
934 :
935 : /*
936 : * Header manipulation
937 : */
938 : static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
939 : __be32 flowlabel)
940 : {
941 : *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
942 : }
943 :
944 : static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
945 : {
946 : return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
947 : }
948 :
949 0 : static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
950 : {
951 0 : return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
952 : }
953 :
954 : static inline u8 ip6_tclass(__be32 flowinfo)
955 : {
956 : return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
957 : }
958 :
959 : static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
960 : {
961 : return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
962 : }
963 :
964 0 : static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6)
965 : {
966 0 : return fl6->flowlabel & IPV6_FLOWLABEL_MASK;
967 : }
968 :
969 : /*
970 : * Prototypes exported by ipv6
971 : */
972 :
973 : /*
974 : * rcv function (called from netdevice level)
975 : */
976 :
977 : int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
978 : struct packet_type *pt, struct net_device *orig_dev);
979 : void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
980 : struct net_device *orig_dev);
981 :
982 : int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
983 :
984 : /*
985 : * upper-layer output functions
986 : */
987 : int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
988 : __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority);
989 :
990 : int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
991 :
992 : int ip6_append_data(struct sock *sk,
993 : int getfrag(void *from, char *to, int offset, int len,
994 : int odd, struct sk_buff *skb),
995 : void *from, int length, int transhdrlen,
996 : struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
997 : struct rt6_info *rt, unsigned int flags);
998 :
999 : int ip6_push_pending_frames(struct sock *sk);
1000 :
1001 : void ip6_flush_pending_frames(struct sock *sk);
1002 :
1003 : int ip6_send_skb(struct sk_buff *skb);
1004 :
1005 : struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
1006 : struct inet_cork_full *cork,
1007 : struct inet6_cork *v6_cork);
1008 : struct sk_buff *ip6_make_skb(struct sock *sk,
1009 : int getfrag(void *from, char *to, int offset,
1010 : int len, int odd, struct sk_buff *skb),
1011 : void *from, int length, int transhdrlen,
1012 : struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
1013 : struct rt6_info *rt, unsigned int flags,
1014 : struct inet_cork_full *cork);
1015 :
1016 : static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
1017 : {
1018 : return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
1019 : &inet6_sk(sk)->cork);
1020 : }
1021 :
1022 : int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
1023 : struct flowi6 *fl6);
1024 : struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6,
1025 : const struct in6_addr *final_dst);
1026 : struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
1027 : const struct in6_addr *final_dst,
1028 : bool connected);
1029 : struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb,
1030 : struct net_device *dev,
1031 : struct net *net, struct socket *sock,
1032 : struct in6_addr *saddr,
1033 : const struct ip_tunnel_info *info,
1034 : u8 protocol, bool use_cache);
1035 : struct dst_entry *ip6_blackhole_route(struct net *net,
1036 : struct dst_entry *orig_dst);
1037 :
1038 : /*
1039 : * skb processing functions
1040 : */
1041 :
1042 : int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1043 : int ip6_forward(struct sk_buff *skb);
1044 : int ip6_input(struct sk_buff *skb);
1045 : int ip6_mc_input(struct sk_buff *skb);
1046 : void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
1047 : bool have_final);
1048 :
1049 : int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1050 : int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1051 :
1052 : /*
1053 : * Extension header (options) processing
1054 : */
1055 :
1056 : void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1057 : u8 *proto, struct in6_addr **daddr_p,
1058 : struct in6_addr *saddr);
1059 : void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1060 : u8 *proto);
1061 :
1062 : int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
1063 : __be16 *frag_offp);
1064 :
1065 : bool ipv6_ext_hdr(u8 nexthdr);
1066 :
1067 : enum {
1068 : IP6_FH_F_FRAG = (1 << 0),
1069 : IP6_FH_F_AUTH = (1 << 1),
1070 : IP6_FH_F_SKIP_RH = (1 << 2),
1071 : };
1072 :
1073 : /* find specified header and get offset to it */
1074 : int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
1075 : unsigned short *fragoff, int *fragflg);
1076 :
1077 : int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
1078 :
1079 : struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
1080 : const struct ipv6_txoptions *opt,
1081 : struct in6_addr *orig);
1082 :
1083 : /*
1084 : * socket options (ipv6_sockglue.c)
1085 : */
1086 :
1087 : int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1088 : unsigned int optlen);
1089 : int ipv6_getsockopt(struct sock *sk, int level, int optname,
1090 : char __user *optval, int __user *optlen);
1091 :
1092 : int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
1093 : int addr_len);
1094 : int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
1095 : int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
1096 : int addr_len);
1097 : int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
1098 : void ip6_datagram_release_cb(struct sock *sk);
1099 :
1100 : int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
1101 : int *addr_len);
1102 : int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
1103 : int *addr_len);
1104 : void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1105 : u32 info, u8 *payload);
1106 : void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
1107 : void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
1108 :
1109 : int inet6_release(struct socket *sock);
1110 : int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
1111 : int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
1112 : int peer);
1113 : int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1114 : int inet6_compat_ioctl(struct socket *sock, unsigned int cmd,
1115 : unsigned long arg);
1116 :
1117 : int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1118 : struct sock *sk);
1119 : int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size);
1120 : int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1121 : int flags);
1122 :
1123 : /*
1124 : * reassembly.c
1125 : */
1126 : extern const struct proto_ops inet6_stream_ops;
1127 : extern const struct proto_ops inet6_dgram_ops;
1128 : extern const struct proto_ops inet6_sockraw_ops;
1129 :
1130 : struct group_source_req;
1131 : struct group_filter;
1132 :
1133 : int ip6_mc_source(int add, int omode, struct sock *sk,
1134 : struct group_source_req *pgsr);
1135 : int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
1136 : struct sockaddr_storage *list);
1137 : int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1138 : struct sockaddr_storage __user *p);
1139 :
1140 : #ifdef CONFIG_PROC_FS
1141 : int ac6_proc_init(struct net *net);
1142 : void ac6_proc_exit(struct net *net);
1143 : int raw6_proc_init(void);
1144 : void raw6_proc_exit(void);
1145 : int tcp6_proc_init(struct net *net);
1146 : void tcp6_proc_exit(struct net *net);
1147 : int udp6_proc_init(struct net *net);
1148 : void udp6_proc_exit(struct net *net);
1149 : int udplite6_proc_init(void);
1150 : void udplite6_proc_exit(void);
1151 : int ipv6_misc_proc_init(void);
1152 : void ipv6_misc_proc_exit(void);
1153 : int snmp6_register_dev(struct inet6_dev *idev);
1154 : int snmp6_unregister_dev(struct inet6_dev *idev);
1155 :
1156 : #else
1157 : static inline int ac6_proc_init(struct net *net) { return 0; }
1158 : static inline void ac6_proc_exit(struct net *net) { }
1159 : static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1160 : static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1161 : #endif
1162 :
1163 : #ifdef CONFIG_SYSCTL
1164 : struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1165 : struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1166 : int ipv6_sysctl_register(void);
1167 : void ipv6_sysctl_unregister(void);
1168 : #endif
1169 :
1170 : int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1171 : const struct in6_addr *addr);
1172 : int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
1173 : const struct in6_addr *addr, unsigned int mode);
1174 : int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1175 : const struct in6_addr *addr);
1176 :
1177 : static inline int ip6_sock_set_v6only(struct sock *sk)
1178 : {
1179 : if (inet_sk(sk)->inet_num)
1180 : return -EINVAL;
1181 : lock_sock(sk);
1182 : sk->sk_ipv6only = true;
1183 : release_sock(sk);
1184 : return 0;
1185 : }
1186 :
1187 : static inline void ip6_sock_set_recverr(struct sock *sk)
1188 : {
1189 : lock_sock(sk);
1190 : inet6_sk(sk)->recverr = true;
1191 : release_sock(sk);
1192 : }
1193 :
1194 : static inline int __ip6_sock_set_addr_preferences(struct sock *sk, int val)
1195 : {
1196 : unsigned int pref = 0;
1197 : unsigned int prefmask = ~0;
1198 :
1199 : /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
1200 : switch (val & (IPV6_PREFER_SRC_PUBLIC |
1201 : IPV6_PREFER_SRC_TMP |
1202 : IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
1203 : case IPV6_PREFER_SRC_PUBLIC:
1204 : pref |= IPV6_PREFER_SRC_PUBLIC;
1205 : prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1206 : IPV6_PREFER_SRC_TMP);
1207 : break;
1208 : case IPV6_PREFER_SRC_TMP:
1209 : pref |= IPV6_PREFER_SRC_TMP;
1210 : prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1211 : IPV6_PREFER_SRC_TMP);
1212 : break;
1213 : case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
1214 : prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1215 : IPV6_PREFER_SRC_TMP);
1216 : break;
1217 : case 0:
1218 : break;
1219 : default:
1220 : return -EINVAL;
1221 : }
1222 :
1223 : /* check HOME/COA conflicts */
1224 : switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) {
1225 : case IPV6_PREFER_SRC_HOME:
1226 : prefmask &= ~IPV6_PREFER_SRC_COA;
1227 : break;
1228 : case IPV6_PREFER_SRC_COA:
1229 : pref |= IPV6_PREFER_SRC_COA;
1230 : break;
1231 : case 0:
1232 : break;
1233 : default:
1234 : return -EINVAL;
1235 : }
1236 :
1237 : /* check CGA/NONCGA conflicts */
1238 : switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
1239 : case IPV6_PREFER_SRC_CGA:
1240 : case IPV6_PREFER_SRC_NONCGA:
1241 : case 0:
1242 : break;
1243 : default:
1244 : return -EINVAL;
1245 : }
1246 :
1247 : inet6_sk(sk)->srcprefs = (inet6_sk(sk)->srcprefs & prefmask) | pref;
1248 : return 0;
1249 : }
1250 :
1251 : static inline int ip6_sock_set_addr_preferences(struct sock *sk, bool val)
1252 : {
1253 : int ret;
1254 :
1255 : lock_sock(sk);
1256 : ret = __ip6_sock_set_addr_preferences(sk, val);
1257 : release_sock(sk);
1258 : return ret;
1259 : }
1260 :
1261 : static inline void ip6_sock_set_recvpktinfo(struct sock *sk)
1262 : {
1263 : lock_sock(sk);
1264 : inet6_sk(sk)->rxopt.bits.rxinfo = true;
1265 : release_sock(sk);
1266 : }
1267 :
1268 : #endif /* _NET_IPV6_H */
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