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/flow.h>
19 : #include <net/flow_dissector.h>
20 : #include <net/inet_dscp.h>
21 : #include <net/snmp.h>
22 : #include <net/netns/hash.h>
23 :
24 : struct ip_tunnel_info;
25 :
26 : #define SIN6_LEN_RFC2133 24
27 :
28 : #define IPV6_MAXPLEN 65535
29 :
30 : /*
31 : * NextHeader field of IPv6 header
32 : */
33 :
34 : #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
35 : #define NEXTHDR_IPV4 4 /* IPv4 in IPv6 */
36 : #define NEXTHDR_TCP 6 /* TCP segment. */
37 : #define NEXTHDR_UDP 17 /* UDP message. */
38 : #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
39 : #define NEXTHDR_ROUTING 43 /* Routing header. */
40 : #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
41 : #define NEXTHDR_GRE 47 /* GRE header. */
42 : #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
43 : #define NEXTHDR_AUTH 51 /* Authentication header. */
44 : #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
45 : #define NEXTHDR_NONE 59 /* No next header */
46 : #define NEXTHDR_DEST 60 /* Destination options header. */
47 : #define NEXTHDR_SCTP 132 /* SCTP message. */
48 : #define NEXTHDR_MOBILITY 135 /* Mobility header. */
49 :
50 : #define NEXTHDR_MAX 255
51 :
52 : #define IPV6_DEFAULT_HOPLIMIT 64
53 : #define IPV6_DEFAULT_MCASTHOPS 1
54 :
55 : /* Limits on Hop-by-Hop and Destination options.
56 : *
57 : * Per RFC8200 there is no limit on the maximum number or lengths of options in
58 : * Hop-by-Hop or Destination options other then the packet must fit in an MTU.
59 : * We allow configurable limits in order to mitigate potential denial of
60 : * service attacks.
61 : *
62 : * There are three limits that may be set:
63 : * - Limit the number of options in a Hop-by-Hop or Destination options
64 : * extension header
65 : * - Limit the byte length of a Hop-by-Hop or Destination options extension
66 : * header
67 : * - Disallow unknown options
68 : *
69 : * The limits are expressed in corresponding sysctls:
70 : *
71 : * ipv6.sysctl.max_dst_opts_cnt
72 : * ipv6.sysctl.max_hbh_opts_cnt
73 : * ipv6.sysctl.max_dst_opts_len
74 : * ipv6.sysctl.max_hbh_opts_len
75 : *
76 : * max_*_opts_cnt is the number of TLVs that are allowed for Destination
77 : * options or Hop-by-Hop options. If the number is less than zero then unknown
78 : * TLVs are disallowed and the number of known options that are allowed is the
79 : * absolute value. Setting the value to INT_MAX indicates no limit.
80 : *
81 : * max_*_opts_len is the length limit in bytes of a Destination or
82 : * Hop-by-Hop options extension header. Setting the value to INT_MAX
83 : * indicates no length limit.
84 : *
85 : * If a limit is exceeded when processing an extension header the packet is
86 : * silently discarded.
87 : */
88 :
89 : /* Default limits for Hop-by-Hop and Destination options */
90 : #define IP6_DEFAULT_MAX_DST_OPTS_CNT 8
91 : #define IP6_DEFAULT_MAX_HBH_OPTS_CNT 8
92 : #define IP6_DEFAULT_MAX_DST_OPTS_LEN INT_MAX /* No limit */
93 : #define IP6_DEFAULT_MAX_HBH_OPTS_LEN INT_MAX /* No limit */
94 :
95 : /*
96 : * Addr type
97 : *
98 : * type - unicast | multicast
99 : * scope - local | site | global
100 : * v4 - compat
101 : * v4mapped
102 : * any
103 : * loopback
104 : */
105 :
106 : #define IPV6_ADDR_ANY 0x0000U
107 :
108 : #define IPV6_ADDR_UNICAST 0x0001U
109 : #define IPV6_ADDR_MULTICAST 0x0002U
110 :
111 : #define IPV6_ADDR_LOOPBACK 0x0010U
112 : #define IPV6_ADDR_LINKLOCAL 0x0020U
113 : #define IPV6_ADDR_SITELOCAL 0x0040U
114 :
115 : #define IPV6_ADDR_COMPATv4 0x0080U
116 :
117 : #define IPV6_ADDR_SCOPE_MASK 0x00f0U
118 :
119 : #define IPV6_ADDR_MAPPED 0x1000U
120 :
121 : /*
122 : * Addr scopes
123 : */
124 : #define IPV6_ADDR_MC_SCOPE(a) \
125 : ((a)->s6_addr[1] & 0x0f) /* nonstandard */
126 : #define __IPV6_ADDR_SCOPE_INVALID -1
127 : #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
128 : #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
129 : #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
130 : #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
131 : #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
132 :
133 : /*
134 : * Addr flags
135 : */
136 : #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
137 : ((a)->s6_addr[1] & 0x10)
138 : #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
139 : ((a)->s6_addr[1] & 0x20)
140 : #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
141 : ((a)->s6_addr[1] & 0x40)
142 :
143 : /*
144 : * fragmentation header
145 : */
146 :
147 : struct frag_hdr {
148 : __u8 nexthdr;
149 : __u8 reserved;
150 : __be16 frag_off;
151 : __be32 identification;
152 : };
153 :
154 : #define IP6_MF 0x0001
155 : #define IP6_OFFSET 0xFFF8
156 :
157 : struct ip6_fraglist_iter {
158 : struct ipv6hdr *tmp_hdr;
159 : struct sk_buff *frag;
160 : int offset;
161 : unsigned int hlen;
162 : __be32 frag_id;
163 : u8 nexthdr;
164 : };
165 :
166 : int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr,
167 : u8 nexthdr, __be32 frag_id,
168 : struct ip6_fraglist_iter *iter);
169 : void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter);
170 :
171 : static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter)
172 : {
173 : struct sk_buff *skb = iter->frag;
174 :
175 : iter->frag = skb->next;
176 : skb_mark_not_on_list(skb);
177 :
178 : return skb;
179 : }
180 :
181 : struct ip6_frag_state {
182 : u8 *prevhdr;
183 : unsigned int hlen;
184 : unsigned int mtu;
185 : unsigned int left;
186 : int offset;
187 : int ptr;
188 : int hroom;
189 : int troom;
190 : __be32 frag_id;
191 : u8 nexthdr;
192 : };
193 :
194 : void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu,
195 : unsigned short needed_tailroom, int hdr_room, u8 *prevhdr,
196 : u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state);
197 : struct sk_buff *ip6_frag_next(struct sk_buff *skb,
198 : struct ip6_frag_state *state);
199 :
200 : #define IP6_REPLY_MARK(net, mark) \
201 : ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
202 :
203 : #include <net/sock.h>
204 :
205 : /* sysctls */
206 : extern int sysctl_mld_max_msf;
207 : extern int sysctl_mld_qrv;
208 :
209 : #define _DEVINC(net, statname, mod, idev, field) \
210 : ({ \
211 : struct inet6_dev *_idev = (idev); \
212 : if (likely(_idev != NULL)) \
213 : mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
214 : mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
215 : })
216 :
217 : /* per device counters are atomic_long_t */
218 : #define _DEVINCATOMIC(net, statname, mod, idev, field) \
219 : ({ \
220 : struct inet6_dev *_idev = (idev); \
221 : if (likely(_idev != NULL)) \
222 : SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
223 : mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
224 : })
225 :
226 : /* per device and per net counters are atomic_long_t */
227 : #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
228 : ({ \
229 : struct inet6_dev *_idev = (idev); \
230 : if (likely(_idev != NULL)) \
231 : SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
232 : SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
233 : })
234 :
235 : #define _DEVADD(net, statname, mod, idev, field, val) \
236 : ({ \
237 : struct inet6_dev *_idev = (idev); \
238 : if (likely(_idev != NULL)) \
239 : mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
240 : mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
241 : })
242 :
243 : #define _DEVUPD(net, statname, mod, idev, field, val) \
244 : ({ \
245 : struct inet6_dev *_idev = (idev); \
246 : if (likely(_idev != NULL)) \
247 : mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
248 : mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
249 : })
250 :
251 : /* MIBs */
252 :
253 : #define IP6_INC_STATS(net, idev,field) \
254 : _DEVINC(net, ipv6, , idev, field)
255 : #define __IP6_INC_STATS(net, idev,field) \
256 : _DEVINC(net, ipv6, __, idev, field)
257 : #define IP6_ADD_STATS(net, idev,field,val) \
258 : _DEVADD(net, ipv6, , idev, field, val)
259 : #define __IP6_ADD_STATS(net, idev,field,val) \
260 : _DEVADD(net, ipv6, __, idev, field, val)
261 : #define IP6_UPD_PO_STATS(net, idev,field,val) \
262 : _DEVUPD(net, ipv6, , idev, field, val)
263 : #define __IP6_UPD_PO_STATS(net, idev,field,val) \
264 : _DEVUPD(net, ipv6, __, idev, field, val)
265 : #define ICMP6_INC_STATS(net, idev, field) \
266 : _DEVINCATOMIC(net, icmpv6, , idev, field)
267 : #define __ICMP6_INC_STATS(net, idev, field) \
268 : _DEVINCATOMIC(net, icmpv6, __, idev, field)
269 :
270 : #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
271 : _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
272 : #define ICMP6MSGIN_INC_STATS(net, idev, field) \
273 : _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
274 :
275 : struct ip6_ra_chain {
276 : struct ip6_ra_chain *next;
277 : struct sock *sk;
278 : int sel;
279 : void (*destructor)(struct sock *);
280 : };
281 :
282 : extern struct ip6_ra_chain *ip6_ra_chain;
283 : extern rwlock_t ip6_ra_lock;
284 :
285 : /*
286 : This structure is prepared by protocol, when parsing
287 : ancillary data and passed to IPv6.
288 : */
289 :
290 : struct ipv6_txoptions {
291 : refcount_t refcnt;
292 : /* Length of this structure */
293 : int tot_len;
294 :
295 : /* length of extension headers */
296 :
297 : __u16 opt_flen; /* after fragment hdr */
298 : __u16 opt_nflen; /* before fragment hdr */
299 :
300 : struct ipv6_opt_hdr *hopopt;
301 : struct ipv6_opt_hdr *dst0opt;
302 : struct ipv6_rt_hdr *srcrt; /* Routing Header */
303 : struct ipv6_opt_hdr *dst1opt;
304 : struct rcu_head rcu;
305 : /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
306 : };
307 :
308 : /* flowlabel_reflect sysctl values */
309 : enum flowlabel_reflect {
310 : FLOWLABEL_REFLECT_ESTABLISHED = 1,
311 : FLOWLABEL_REFLECT_TCP_RESET = 2,
312 : FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4,
313 : };
314 :
315 : struct ip6_flowlabel {
316 : struct ip6_flowlabel __rcu *next;
317 : __be32 label;
318 : atomic_t users;
319 : struct in6_addr dst;
320 : struct ipv6_txoptions *opt;
321 : unsigned long linger;
322 : struct rcu_head rcu;
323 : u8 share;
324 : union {
325 : struct pid *pid;
326 : kuid_t uid;
327 : } owner;
328 : unsigned long lastuse;
329 : unsigned long expires;
330 : struct net *fl_net;
331 : };
332 :
333 : #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
334 : #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
335 : #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
336 :
337 : #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
338 : #define IPV6_TCLASS_SHIFT 20
339 :
340 : struct ipv6_fl_socklist {
341 : struct ipv6_fl_socklist __rcu *next;
342 : struct ip6_flowlabel *fl;
343 : struct rcu_head rcu;
344 : };
345 :
346 : struct ipcm6_cookie {
347 : struct sockcm_cookie sockc;
348 : __s16 hlimit;
349 : __s16 tclass;
350 : __u16 gso_size;
351 : __s8 dontfrag;
352 : struct ipv6_txoptions *opt;
353 : };
354 :
355 : static inline void ipcm6_init(struct ipcm6_cookie *ipc6)
356 : {
357 : *ipc6 = (struct ipcm6_cookie) {
358 : .hlimit = -1,
359 : .tclass = -1,
360 : .dontfrag = -1,
361 : };
362 : }
363 :
364 : static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6,
365 : const struct ipv6_pinfo *np)
366 : {
367 : *ipc6 = (struct ipcm6_cookie) {
368 : .hlimit = -1,
369 : .tclass = np->tclass,
370 : .dontfrag = np->dontfrag,
371 : };
372 : }
373 :
374 : static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
375 : {
376 : struct ipv6_txoptions *opt;
377 :
378 : rcu_read_lock();
379 : opt = rcu_dereference(np->opt);
380 : if (opt) {
381 : if (!refcount_inc_not_zero(&opt->refcnt))
382 : opt = NULL;
383 : else
384 : opt = rcu_pointer_handoff(opt);
385 : }
386 : rcu_read_unlock();
387 : return opt;
388 : }
389 :
390 : static inline void txopt_put(struct ipv6_txoptions *opt)
391 : {
392 : if (opt && refcount_dec_and_test(&opt->refcnt))
393 : kfree_rcu(opt, rcu);
394 : }
395 :
396 : #if IS_ENABLED(CONFIG_IPV6)
397 : struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label);
398 :
399 : extern struct static_key_false_deferred ipv6_flowlabel_exclusive;
400 : static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk,
401 : __be32 label)
402 : {
403 : if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key) &&
404 : READ_ONCE(sock_net(sk)->ipv6.flowlabel_has_excl))
405 : return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT);
406 :
407 : return NULL;
408 : }
409 : #endif
410 :
411 : struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
412 : struct ip6_flowlabel *fl,
413 : struct ipv6_txoptions *fopt);
414 : void fl6_free_socklist(struct sock *sk);
415 : int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen);
416 : int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
417 : int flags);
418 : int ip6_flowlabel_init(void);
419 : void ip6_flowlabel_cleanup(void);
420 : bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
421 :
422 : static inline void fl6_sock_release(struct ip6_flowlabel *fl)
423 : {
424 : if (fl)
425 : atomic_dec(&fl->users);
426 : }
427 :
428 : void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
429 :
430 : void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
431 : struct icmp6hdr *thdr, int len);
432 :
433 : int ip6_ra_control(struct sock *sk, int sel);
434 :
435 : int ipv6_parse_hopopts(struct sk_buff *skb);
436 :
437 : struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
438 : struct ipv6_txoptions *opt);
439 : struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
440 : struct ipv6_txoptions *opt,
441 : int newtype,
442 : struct ipv6_opt_hdr *newopt);
443 : struct ipv6_txoptions *__ipv6_fixup_options(struct ipv6_txoptions *opt_space,
444 : struct ipv6_txoptions *opt);
445 :
446 : static inline struct ipv6_txoptions *
447 : ipv6_fixup_options(struct ipv6_txoptions *opt_space, struct ipv6_txoptions *opt)
448 : {
449 : if (!opt)
450 : return NULL;
451 : return __ipv6_fixup_options(opt_space, opt);
452 : }
453 :
454 : bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
455 : const struct inet6_skb_parm *opt);
456 : struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
457 : struct ipv6_txoptions *opt);
458 :
459 : static inline bool ipv6_accept_ra(struct inet6_dev *idev)
460 : {
461 : /* If forwarding is enabled, RA are not accepted unless the special
462 : * hybrid mode (accept_ra=2) is enabled.
463 : */
464 : return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
465 : idev->cnf.accept_ra;
466 : }
467 :
468 : #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
469 : #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
470 : #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
471 :
472 : int __ipv6_addr_type(const struct in6_addr *addr);
473 : static inline int ipv6_addr_type(const struct in6_addr *addr)
474 : {
475 : return __ipv6_addr_type(addr) & 0xffff;
476 : }
477 :
478 : static inline int ipv6_addr_scope(const struct in6_addr *addr)
479 : {
480 : return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
481 : }
482 :
483 : static inline int __ipv6_addr_src_scope(int type)
484 : {
485 : return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
486 : }
487 :
488 : static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
489 : {
490 : return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
491 : }
492 :
493 : static inline bool __ipv6_addr_needs_scope_id(int type)
494 : {
495 : return type & IPV6_ADDR_LINKLOCAL ||
496 : (type & IPV6_ADDR_MULTICAST &&
497 : (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
498 : }
499 :
500 : static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
501 : {
502 : return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
503 : }
504 :
505 : static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
506 : {
507 : return memcmp(a1, a2, sizeof(struct in6_addr));
508 : }
509 :
510 : static inline bool
511 : ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
512 : const struct in6_addr *a2)
513 : {
514 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
515 : const unsigned long *ul1 = (const unsigned long *)a1;
516 : const unsigned long *ulm = (const unsigned long *)m;
517 : const unsigned long *ul2 = (const unsigned long *)a2;
518 :
519 : return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
520 : ((ul1[1] ^ ul2[1]) & ulm[1]));
521 : #else
522 : return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
523 : ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
524 : ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
525 : ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
526 : #endif
527 : }
528 :
529 : static inline void ipv6_addr_prefix(struct in6_addr *pfx,
530 : const struct in6_addr *addr,
531 : int plen)
532 : {
533 : /* caller must guarantee 0 <= plen <= 128 */
534 : int o = plen >> 3,
535 : b = plen & 0x7;
536 :
537 : memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
538 : memcpy(pfx->s6_addr, addr, o);
539 : if (b != 0)
540 : pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
541 : }
542 :
543 : static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
544 : const struct in6_addr *pfx,
545 : int plen)
546 : {
547 : /* caller must guarantee 0 <= plen <= 128 */
548 : int o = plen >> 3,
549 : b = plen & 0x7;
550 :
551 : memcpy(addr->s6_addr, pfx, o);
552 : if (b != 0) {
553 : addr->s6_addr[o] &= ~(0xff00 >> b);
554 : addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
555 : }
556 : }
557 :
558 : static inline void __ipv6_addr_set_half(__be32 *addr,
559 : __be32 wh, __be32 wl)
560 : {
561 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
562 : #if defined(__BIG_ENDIAN)
563 : if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
564 : *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
565 : return;
566 : }
567 : #elif defined(__LITTLE_ENDIAN)
568 : if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
569 : *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
570 : return;
571 : }
572 : #endif
573 : #endif
574 : addr[0] = wh;
575 : addr[1] = wl;
576 : }
577 :
578 : static inline void ipv6_addr_set(struct in6_addr *addr,
579 : __be32 w1, __be32 w2,
580 : __be32 w3, __be32 w4)
581 : {
582 : __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
583 : __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
584 : }
585 :
586 : static inline bool ipv6_addr_equal(const struct in6_addr *a1,
587 : const struct in6_addr *a2)
588 : {
589 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
590 : const unsigned long *ul1 = (const unsigned long *)a1;
591 : const unsigned long *ul2 = (const unsigned long *)a2;
592 :
593 : return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
594 : #else
595 : return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
596 : (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
597 : (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
598 : (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
599 : #endif
600 : }
601 :
602 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
603 : static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
604 : const __be64 *a2,
605 : unsigned int len)
606 : {
607 : if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
608 : return false;
609 : return true;
610 : }
611 :
612 : static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
613 : const struct in6_addr *addr2,
614 : unsigned int prefixlen)
615 : {
616 : const __be64 *a1 = (const __be64 *)addr1;
617 : const __be64 *a2 = (const __be64 *)addr2;
618 :
619 : if (prefixlen >= 64) {
620 : if (a1[0] ^ a2[0])
621 : return false;
622 : return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
623 : }
624 : return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
625 : }
626 : #else
627 : static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
628 : const struct in6_addr *addr2,
629 : unsigned int prefixlen)
630 : {
631 : const __be32 *a1 = addr1->s6_addr32;
632 : const __be32 *a2 = addr2->s6_addr32;
633 : unsigned int pdw, pbi;
634 :
635 : /* check complete u32 in prefix */
636 : pdw = prefixlen >> 5;
637 : if (pdw && memcmp(a1, a2, pdw << 2))
638 : return false;
639 :
640 : /* check incomplete u32 in prefix */
641 : pbi = prefixlen & 0x1f;
642 : if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
643 : return false;
644 :
645 : return true;
646 : }
647 : #endif
648 :
649 : static inline bool ipv6_addr_any(const struct in6_addr *a)
650 : {
651 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
652 : const unsigned long *ul = (const unsigned long *)a;
653 :
654 : return (ul[0] | ul[1]) == 0UL;
655 : #else
656 : return (a->s6_addr32[0] | a->s6_addr32[1] |
657 : a->s6_addr32[2] | a->s6_addr32[3]) == 0;
658 : #endif
659 : }
660 :
661 : static inline u32 ipv6_addr_hash(const struct in6_addr *a)
662 : {
663 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
664 : const unsigned long *ul = (const unsigned long *)a;
665 : unsigned long x = ul[0] ^ ul[1];
666 :
667 : return (u32)(x ^ (x >> 32));
668 : #else
669 : return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
670 : a->s6_addr32[2] ^ a->s6_addr32[3]);
671 : #endif
672 : }
673 :
674 : /* more secured version of ipv6_addr_hash() */
675 : static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
676 : {
677 : u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
678 :
679 : return jhash_3words(v,
680 : (__force u32)a->s6_addr32[2],
681 : (__force u32)a->s6_addr32[3],
682 : initval);
683 : }
684 :
685 : static inline bool ipv6_addr_loopback(const struct in6_addr *a)
686 : {
687 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
688 : const __be64 *be = (const __be64 *)a;
689 :
690 : return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
691 : #else
692 : return (a->s6_addr32[0] | a->s6_addr32[1] |
693 : a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
694 : #endif
695 : }
696 :
697 : /*
698 : * Note that we must __force cast these to unsigned long to make sparse happy,
699 : * since all of the endian-annotated types are fixed size regardless of arch.
700 : */
701 : static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
702 : {
703 : return (
704 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
705 : *(unsigned long *)a |
706 : #else
707 0 : (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
708 : #endif
709 0 : (__force unsigned long)(a->s6_addr32[2] ^
710 0 : cpu_to_be32(0x0000ffff))) == 0UL;
711 : }
712 :
713 : static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a)
714 : {
715 : return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]);
716 : }
717 :
718 : static inline u32 ipv6_portaddr_hash(const struct net *net,
719 : const struct in6_addr *addr6,
720 : unsigned int port)
721 : {
722 : unsigned int hash, mix = net_hash_mix(net);
723 :
724 : if (ipv6_addr_any(addr6))
725 : hash = jhash_1word(0, mix);
726 : else if (ipv6_addr_v4mapped(addr6))
727 : hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
728 : else
729 : hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
730 :
731 : return hash ^ port;
732 : }
733 :
734 : /*
735 : * Check for a RFC 4843 ORCHID address
736 : * (Overlay Routable Cryptographic Hash Identifiers)
737 : */
738 : static inline bool ipv6_addr_orchid(const struct in6_addr *a)
739 : {
740 : return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
741 : }
742 :
743 : static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
744 : {
745 : return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
746 : }
747 :
748 : static inline void ipv6_addr_set_v4mapped(const __be32 addr,
749 : struct in6_addr *v4mapped)
750 : {
751 : ipv6_addr_set(v4mapped,
752 : 0, 0,
753 : htonl(0x0000FFFF),
754 : addr);
755 : }
756 :
757 : /*
758 : * find the first different bit between two addresses
759 : * length of address must be a multiple of 32bits
760 : */
761 : static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
762 : {
763 : const __be32 *a1 = token1, *a2 = token2;
764 : int i;
765 :
766 : addrlen >>= 2;
767 :
768 : for (i = 0; i < addrlen; i++) {
769 : __be32 xb = a1[i] ^ a2[i];
770 : if (xb)
771 : return i * 32 + 31 - __fls(ntohl(xb));
772 : }
773 :
774 : /*
775 : * we should *never* get to this point since that
776 : * would mean the addrs are equal
777 : *
778 : * However, we do get to it 8) And exacly, when
779 : * addresses are equal 8)
780 : *
781 : * ip route add 1111::/128 via ...
782 : * ip route add 1111::/64 via ...
783 : * and we are here.
784 : *
785 : * Ideally, this function should stop comparison
786 : * at prefix length. It does not, but it is still OK,
787 : * if returned value is greater than prefix length.
788 : * --ANK (980803)
789 : */
790 : return addrlen << 5;
791 : }
792 :
793 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
794 : static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
795 : {
796 : const __be64 *a1 = token1, *a2 = token2;
797 : int i;
798 :
799 : addrlen >>= 3;
800 :
801 : for (i = 0; i < addrlen; i++) {
802 : __be64 xb = a1[i] ^ a2[i];
803 : if (xb)
804 : return i * 64 + 63 - __fls(be64_to_cpu(xb));
805 : }
806 :
807 : return addrlen << 6;
808 : }
809 : #endif
810 :
811 : static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
812 : {
813 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
814 : if (__builtin_constant_p(addrlen) && !(addrlen & 7))
815 : return __ipv6_addr_diff64(token1, token2, addrlen);
816 : #endif
817 : return __ipv6_addr_diff32(token1, token2, addrlen);
818 : }
819 :
820 : static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
821 : {
822 : return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
823 : }
824 :
825 : __be32 ipv6_select_ident(struct net *net,
826 : const struct in6_addr *daddr,
827 : const struct in6_addr *saddr);
828 : __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
829 :
830 : int ip6_dst_hoplimit(struct dst_entry *dst);
831 :
832 : static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
833 : struct dst_entry *dst)
834 : {
835 : int hlimit;
836 :
837 : if (ipv6_addr_is_multicast(&fl6->daddr))
838 : hlimit = np->mcast_hops;
839 : else
840 : hlimit = np->hop_limit;
841 : if (hlimit < 0)
842 : hlimit = ip6_dst_hoplimit(dst);
843 : return hlimit;
844 : }
845 :
846 : /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
847 : * Equivalent to : flow->v6addrs.src = iph->saddr;
848 : * flow->v6addrs.dst = iph->daddr;
849 : */
850 : static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
851 : const struct ipv6hdr *iph)
852 : {
853 : BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
854 : offsetof(typeof(flow->addrs), v6addrs.src) +
855 : sizeof(flow->addrs.v6addrs.src));
856 : memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
857 : flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
858 : }
859 :
860 : #if IS_ENABLED(CONFIG_IPV6)
861 :
862 : static inline bool ipv6_can_nonlocal_bind(struct net *net,
863 : struct inet_sock *inet)
864 : {
865 : return net->ipv6.sysctl.ip_nonlocal_bind ||
866 : inet->freebind || inet->transparent;
867 : }
868 :
869 : /* Sysctl settings for net ipv6.auto_flowlabels */
870 : #define IP6_AUTO_FLOW_LABEL_OFF 0
871 : #define IP6_AUTO_FLOW_LABEL_OPTOUT 1
872 : #define IP6_AUTO_FLOW_LABEL_OPTIN 2
873 : #define IP6_AUTO_FLOW_LABEL_FORCED 3
874 :
875 : #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
876 :
877 : #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
878 :
879 : static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
880 : __be32 flowlabel, bool autolabel,
881 : struct flowi6 *fl6)
882 : {
883 : u32 hash;
884 :
885 : /* @flowlabel may include more than a flow label, eg, the traffic class.
886 : * Here we want only the flow label value.
887 : */
888 : flowlabel &= IPV6_FLOWLABEL_MASK;
889 :
890 : if (flowlabel ||
891 : net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
892 : (!autolabel &&
893 : net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
894 : return flowlabel;
895 :
896 : hash = skb_get_hash_flowi6(skb, fl6);
897 :
898 : /* Since this is being sent on the wire obfuscate hash a bit
899 : * to minimize possbility that any useful information to an
900 : * attacker is leaked. Only lower 20 bits are relevant.
901 : */
902 : hash = rol32(hash, 16);
903 :
904 : flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
905 :
906 : if (net->ipv6.sysctl.flowlabel_state_ranges)
907 : flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
908 :
909 : return flowlabel;
910 : }
911 :
912 : static inline int ip6_default_np_autolabel(struct net *net)
913 : {
914 : switch (net->ipv6.sysctl.auto_flowlabels) {
915 : case IP6_AUTO_FLOW_LABEL_OFF:
916 : case IP6_AUTO_FLOW_LABEL_OPTIN:
917 : default:
918 : return 0;
919 : case IP6_AUTO_FLOW_LABEL_OPTOUT:
920 : case IP6_AUTO_FLOW_LABEL_FORCED:
921 : return 1;
922 : }
923 : }
924 : #else
925 : static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
926 : __be32 flowlabel, bool autolabel,
927 : struct flowi6 *fl6)
928 : {
929 : return flowlabel;
930 : }
931 : static inline int ip6_default_np_autolabel(struct net *net)
932 : {
933 : return 0;
934 : }
935 : #endif
936 :
937 : #if IS_ENABLED(CONFIG_IPV6)
938 : static inline int ip6_multipath_hash_policy(const struct net *net)
939 : {
940 : return net->ipv6.sysctl.multipath_hash_policy;
941 : }
942 : static inline u32 ip6_multipath_hash_fields(const struct net *net)
943 : {
944 : return net->ipv6.sysctl.multipath_hash_fields;
945 : }
946 : #else
947 : static inline int ip6_multipath_hash_policy(const struct net *net)
948 : {
949 : return 0;
950 : }
951 : static inline u32 ip6_multipath_hash_fields(const struct net *net)
952 : {
953 : return 0;
954 : }
955 : #endif
956 :
957 : /*
958 : * Header manipulation
959 : */
960 : static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
961 : __be32 flowlabel)
962 : {
963 : *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
964 : }
965 :
966 : static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
967 : {
968 : return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
969 : }
970 :
971 : static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
972 : {
973 : return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
974 : }
975 :
976 : static inline u8 ip6_tclass(__be32 flowinfo)
977 : {
978 : return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
979 : }
980 :
981 : static inline dscp_t ip6_dscp(__be32 flowinfo)
982 : {
983 : return inet_dsfield_to_dscp(ip6_tclass(flowinfo));
984 : }
985 :
986 : static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
987 : {
988 : return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
989 : }
990 :
991 : static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6)
992 : {
993 : return fl6->flowlabel & IPV6_FLOWLABEL_MASK;
994 : }
995 :
996 : /*
997 : * Prototypes exported by ipv6
998 : */
999 :
1000 : /*
1001 : * rcv function (called from netdevice level)
1002 : */
1003 :
1004 : int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
1005 : struct packet_type *pt, struct net_device *orig_dev);
1006 : void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
1007 : struct net_device *orig_dev);
1008 :
1009 : int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
1010 :
1011 : /*
1012 : * upper-layer output functions
1013 : */
1014 : int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
1015 : __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority);
1016 :
1017 : int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
1018 :
1019 : int ip6_append_data(struct sock *sk,
1020 : int getfrag(void *from, char *to, int offset, int len,
1021 : int odd, struct sk_buff *skb),
1022 : void *from, int length, int transhdrlen,
1023 : struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
1024 : struct rt6_info *rt, unsigned int flags);
1025 :
1026 : int ip6_push_pending_frames(struct sock *sk);
1027 :
1028 : void ip6_flush_pending_frames(struct sock *sk);
1029 :
1030 : int ip6_send_skb(struct sk_buff *skb);
1031 :
1032 : struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
1033 : struct inet_cork_full *cork,
1034 : struct inet6_cork *v6_cork);
1035 : struct sk_buff *ip6_make_skb(struct sock *sk,
1036 : int getfrag(void *from, char *to, int offset,
1037 : int len, int odd, struct sk_buff *skb),
1038 : void *from, int length, int transhdrlen,
1039 : struct ipcm6_cookie *ipc6,
1040 : struct rt6_info *rt, unsigned int flags,
1041 : struct inet_cork_full *cork);
1042 :
1043 : static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
1044 : {
1045 : return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
1046 : &inet6_sk(sk)->cork);
1047 : }
1048 :
1049 : int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
1050 : struct flowi6 *fl6);
1051 : struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6,
1052 : const struct in6_addr *final_dst);
1053 : struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
1054 : const struct in6_addr *final_dst,
1055 : bool connected);
1056 : struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb,
1057 : struct net_device *dev,
1058 : struct net *net, struct socket *sock,
1059 : struct in6_addr *saddr,
1060 : const struct ip_tunnel_info *info,
1061 : u8 protocol, bool use_cache);
1062 : struct dst_entry *ip6_blackhole_route(struct net *net,
1063 : struct dst_entry *orig_dst);
1064 :
1065 : /*
1066 : * skb processing functions
1067 : */
1068 :
1069 : int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1070 : int ip6_forward(struct sk_buff *skb);
1071 : int ip6_input(struct sk_buff *skb);
1072 : int ip6_mc_input(struct sk_buff *skb);
1073 : void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
1074 : bool have_final);
1075 :
1076 : int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1077 : int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1078 :
1079 : /*
1080 : * Extension header (options) processing
1081 : */
1082 :
1083 : void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1084 : u8 *proto, struct in6_addr **daddr_p,
1085 : struct in6_addr *saddr);
1086 : void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1087 : u8 *proto);
1088 :
1089 : int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
1090 : __be16 *frag_offp);
1091 :
1092 : bool ipv6_ext_hdr(u8 nexthdr);
1093 :
1094 : enum {
1095 : IP6_FH_F_FRAG = (1 << 0),
1096 : IP6_FH_F_AUTH = (1 << 1),
1097 : IP6_FH_F_SKIP_RH = (1 << 2),
1098 : };
1099 :
1100 : /* find specified header and get offset to it */
1101 : int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
1102 : unsigned short *fragoff, int *fragflg);
1103 :
1104 : int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
1105 :
1106 : struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
1107 : const struct ipv6_txoptions *opt,
1108 : struct in6_addr *orig);
1109 :
1110 : /*
1111 : * socket options (ipv6_sockglue.c)
1112 : */
1113 : DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount);
1114 :
1115 : int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1116 : unsigned int optlen);
1117 : int ipv6_getsockopt(struct sock *sk, int level, int optname,
1118 : char __user *optval, int __user *optlen);
1119 :
1120 : int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
1121 : int addr_len);
1122 : int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
1123 : int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
1124 : int addr_len);
1125 : int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
1126 : void ip6_datagram_release_cb(struct sock *sk);
1127 :
1128 : int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
1129 : int *addr_len);
1130 : int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
1131 : int *addr_len);
1132 : void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1133 : u32 info, u8 *payload);
1134 : void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
1135 : void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
1136 :
1137 : int inet6_release(struct socket *sock);
1138 : int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
1139 : int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
1140 : int peer);
1141 : int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1142 : int inet6_compat_ioctl(struct socket *sock, unsigned int cmd,
1143 : unsigned long arg);
1144 :
1145 : int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1146 : struct sock *sk);
1147 : int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size);
1148 : int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1149 : int flags);
1150 :
1151 : /*
1152 : * reassembly.c
1153 : */
1154 : extern const struct proto_ops inet6_stream_ops;
1155 : extern const struct proto_ops inet6_dgram_ops;
1156 : extern const struct proto_ops inet6_sockraw_ops;
1157 :
1158 : struct group_source_req;
1159 : struct group_filter;
1160 :
1161 : int ip6_mc_source(int add, int omode, struct sock *sk,
1162 : struct group_source_req *pgsr);
1163 : int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
1164 : struct sockaddr_storage *list);
1165 : int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1166 : struct sockaddr_storage __user *p);
1167 :
1168 : #ifdef CONFIG_PROC_FS
1169 : int ac6_proc_init(struct net *net);
1170 : void ac6_proc_exit(struct net *net);
1171 : int raw6_proc_init(void);
1172 : void raw6_proc_exit(void);
1173 : int tcp6_proc_init(struct net *net);
1174 : void tcp6_proc_exit(struct net *net);
1175 : int udp6_proc_init(struct net *net);
1176 : void udp6_proc_exit(struct net *net);
1177 : int udplite6_proc_init(void);
1178 : void udplite6_proc_exit(void);
1179 : int ipv6_misc_proc_init(void);
1180 : void ipv6_misc_proc_exit(void);
1181 : int snmp6_register_dev(struct inet6_dev *idev);
1182 : int snmp6_unregister_dev(struct inet6_dev *idev);
1183 :
1184 : #else
1185 : static inline int ac6_proc_init(struct net *net) { return 0; }
1186 : static inline void ac6_proc_exit(struct net *net) { }
1187 : static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1188 : static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1189 : #endif
1190 :
1191 : #ifdef CONFIG_SYSCTL
1192 : struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1193 : struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1194 : int ipv6_sysctl_register(void);
1195 : void ipv6_sysctl_unregister(void);
1196 : #endif
1197 :
1198 : int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1199 : const struct in6_addr *addr);
1200 : int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
1201 : const struct in6_addr *addr, unsigned int mode);
1202 : int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1203 : const struct in6_addr *addr);
1204 :
1205 : static inline int ip6_sock_set_v6only(struct sock *sk)
1206 : {
1207 : if (inet_sk(sk)->inet_num)
1208 : return -EINVAL;
1209 : lock_sock(sk);
1210 : sk->sk_ipv6only = true;
1211 : release_sock(sk);
1212 : return 0;
1213 : }
1214 :
1215 : static inline void ip6_sock_set_recverr(struct sock *sk)
1216 : {
1217 : lock_sock(sk);
1218 : inet6_sk(sk)->recverr = true;
1219 : release_sock(sk);
1220 : }
1221 :
1222 : static inline int __ip6_sock_set_addr_preferences(struct sock *sk, int val)
1223 : {
1224 : unsigned int pref = 0;
1225 : unsigned int prefmask = ~0;
1226 :
1227 : /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
1228 : switch (val & (IPV6_PREFER_SRC_PUBLIC |
1229 : IPV6_PREFER_SRC_TMP |
1230 : IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
1231 : case IPV6_PREFER_SRC_PUBLIC:
1232 : pref |= IPV6_PREFER_SRC_PUBLIC;
1233 : prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1234 : IPV6_PREFER_SRC_TMP);
1235 : break;
1236 : case IPV6_PREFER_SRC_TMP:
1237 : pref |= IPV6_PREFER_SRC_TMP;
1238 : prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1239 : IPV6_PREFER_SRC_TMP);
1240 : break;
1241 : case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
1242 : prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1243 : IPV6_PREFER_SRC_TMP);
1244 : break;
1245 : case 0:
1246 : break;
1247 : default:
1248 : return -EINVAL;
1249 : }
1250 :
1251 : /* check HOME/COA conflicts */
1252 : switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) {
1253 : case IPV6_PREFER_SRC_HOME:
1254 : prefmask &= ~IPV6_PREFER_SRC_COA;
1255 : break;
1256 : case IPV6_PREFER_SRC_COA:
1257 : pref |= IPV6_PREFER_SRC_COA;
1258 : break;
1259 : case 0:
1260 : break;
1261 : default:
1262 : return -EINVAL;
1263 : }
1264 :
1265 : /* check CGA/NONCGA conflicts */
1266 : switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
1267 : case IPV6_PREFER_SRC_CGA:
1268 : case IPV6_PREFER_SRC_NONCGA:
1269 : case 0:
1270 : break;
1271 : default:
1272 : return -EINVAL;
1273 : }
1274 :
1275 : inet6_sk(sk)->srcprefs = (inet6_sk(sk)->srcprefs & prefmask) | pref;
1276 : return 0;
1277 : }
1278 :
1279 : static inline int ip6_sock_set_addr_preferences(struct sock *sk, bool val)
1280 : {
1281 : int ret;
1282 :
1283 : lock_sock(sk);
1284 : ret = __ip6_sock_set_addr_preferences(sk, val);
1285 : release_sock(sk);
1286 : return ret;
1287 : }
1288 :
1289 : static inline void ip6_sock_set_recvpktinfo(struct sock *sk)
1290 : {
1291 : lock_sock(sk);
1292 : inet6_sk(sk)->rxopt.bits.rxinfo = true;
1293 : release_sock(sk);
1294 : }
1295 :
1296 : #endif /* _NET_IPV6_H */
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