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 /*
29 * NextHeader field of IPv6 header
30 */
31
32 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
33 #define NEXTHDR_IPV4 4 /* IPv4 in IPv6 */
34 #define NEXTHDR_TCP 6 /* TCP segment. */
35 #define NEXTHDR_UDP 17 /* UDP message. */
36 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
37 #define NEXTHDR_ROUTING 43 /* Routing header. */
38 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
39 #define NEXTHDR_GRE 47 /* GRE header. */
40 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
41 #define NEXTHDR_AUTH 51 /* Authentication header. */
42 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
43 #define NEXTHDR_NONE 59 /* No next header */
44 #define NEXTHDR_DEST 60 /* Destination options header. */
45 #define NEXTHDR_SCTP 132 /* SCTP message. */
46 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
47
48 #define NEXTHDR_MAX 255
49
50 #define IPV6_DEFAULT_HOPLIMIT 64
51 #define IPV6_DEFAULT_MCASTHOPS 1
52
53 /* Limits on Hop-by-Hop and Destination options.
54 *
55 * Per RFC8200 there is no limit on the maximum number or lengths of options in
56 * Hop-by-Hop or Destination options other then the packet must fit in an MTU.
57 * We allow configurable limits in order to mitigate potential denial of
58 * service attacks.
59 *
60 * There are three limits that may be set:
61 * - Limit the number of options in a Hop-by-Hop or Destination options
62 * extension header
63 * - Limit the byte length of a Hop-by-Hop or Destination options extension
64 * header
65 * - Disallow unknown options
66 *
67 * The limits are expressed in corresponding sysctls:
68 *
69 * ipv6.sysctl.max_dst_opts_cnt
70 * ipv6.sysctl.max_hbh_opts_cnt
71 * ipv6.sysctl.max_dst_opts_len
72 * ipv6.sysctl.max_hbh_opts_len
73 *
74 * max_*_opts_cnt is the number of TLVs that are allowed for Destination
75 * options or Hop-by-Hop options. If the number is less than zero then unknown
76 * TLVs are disallowed and the number of known options that are allowed is the
77 * absolute value. Setting the value to INT_MAX indicates no limit.
78 *
79 * max_*_opts_len is the length limit in bytes of a Destination or
80 * Hop-by-Hop options extension header. Setting the value to INT_MAX
81 * indicates no length limit.
82 *
83 * If a limit is exceeded when processing an extension header the packet is
84 * silently discarded.
85 */
86
87 /* Default limits for Hop-by-Hop and Destination options */
88 #define IP6_DEFAULT_MAX_DST_OPTS_CNT 8
89 #define IP6_DEFAULT_MAX_HBH_OPTS_CNT 8
90 #define IP6_DEFAULT_MAX_DST_OPTS_LEN INT_MAX /* No limit */
91 #define IP6_DEFAULT_MAX_HBH_OPTS_LEN INT_MAX /* No limit */
92
93 /* Hard limit on traversed IPv6 extension headers */
94 #define IP6_MAX_EXT_HDRS_CNT 12
95
96 /*
97 * Addr type
98 *
99 * type - unicast | multicast
100 * scope - local | site | global
101 * v4 - compat
102 * v4mapped
103 * any
104 * loopback
105 */
106
107 #define IPV6_ADDR_ANY 0x0000U
108
109 #define IPV6_ADDR_UNICAST 0x0001U
110 #define IPV6_ADDR_MULTICAST 0x0002U
111
112 #define IPV6_ADDR_LOOPBACK 0x0010U
113 #define IPV6_ADDR_LINKLOCAL 0x0020U
114 #define IPV6_ADDR_SITELOCAL 0x0040U
115
116 #define IPV6_ADDR_COMPATv4 0x0080U
117
118 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
119
120 #define IPV6_ADDR_MAPPED 0x1000U
121
122 /*
123 * Addr scopes
124 */
125 #define IPV6_ADDR_MC_SCOPE(a) \
126 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
127 #define __IPV6_ADDR_SCOPE_INVALID -1
128 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
129 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
130 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
131 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
132 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
133
134 /*
135 * Addr flags
136 */
137 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
138 ((a)->s6_addr[1] & 0x10)
139 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
140 ((a)->s6_addr[1] & 0x20)
141 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
142 ((a)->s6_addr[1] & 0x40)
143
144 /*
145 * fragmentation header
146 */
147
148 struct frag_hdr {
149 __u8 nexthdr;
150 __u8 reserved;
151 __be16 frag_off;
152 __be32 identification;
153 };
154
155 #define IP6_MF 0x0001
156 #define IP6_OFFSET 0xFFF8
157
158 struct ip6_fraglist_iter {
159 struct ipv6hdr *tmp_hdr;
160 struct sk_buff *frag;
161 int offset;
162 unsigned int hlen;
163 __be32 frag_id;
164 u8 nexthdr;
165 };
166
167 int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr,
168 u8 nexthdr, __be32 frag_id,
169 struct ip6_fraglist_iter *iter);
170 void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter);
171
ip6_fraglist_next(struct ip6_fraglist_iter * iter)172 static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter)
173 {
174 struct sk_buff *skb = iter->frag;
175
176 iter->frag = skb->next;
177 skb_mark_not_on_list(skb);
178
179 return skb;
180 }
181
182 struct ip6_frag_state {
183 u8 *prevhdr;
184 unsigned int hlen;
185 unsigned int mtu;
186 unsigned int left;
187 int offset;
188 int ptr;
189 int hroom;
190 int troom;
191 __be32 frag_id;
192 u8 nexthdr;
193 };
194
195 void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu,
196 unsigned short needed_tailroom, int hdr_room, u8 *prevhdr,
197 u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state);
198 struct sk_buff *ip6_frag_next(struct sk_buff *skb,
199 struct ip6_frag_state *state);
200
201 #define IP6_REPLY_MARK(net, mark) \
202 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
203
204 #include <net/sock.h>
205
206 /* sysctls */
207 extern int sysctl_mld_max_msf;
208 extern int sysctl_mld_qrv;
209
210 #define _DEVINC(net, statname, mod, idev, field) \
211 ({ \
212 struct inet6_dev *_idev = (idev); \
213 if (likely(_idev != NULL)) \
214 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
215 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
216 })
217
218 /* per device counters are atomic_long_t */
219 #define _DEVINCATOMIC(net, statname, mod, idev, field) \
220 ({ \
221 struct inet6_dev *_idev = (idev); \
222 if (likely(_idev != NULL)) \
223 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
224 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
225 })
226
227 /* per device and per net counters are atomic_long_t */
228 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
229 ({ \
230 struct inet6_dev *_idev = (idev); \
231 if (likely(_idev != NULL)) \
232 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
233 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
234 })
235
236 #define _DEVADD(net, statname, mod, idev, field, val) \
237 ({ \
238 struct inet6_dev *_idev = (idev); \
239 unsigned long _field = (field); \
240 unsigned long _val = (val); \
241 if (likely(_idev != NULL)) \
242 mod##SNMP_ADD_STATS((_idev)->stats.statname, _field, _val); \
243 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, _field, _val);\
244 })
245
246 #define _DEVUPD(net, statname, mod, idev, field, val) \
247 ({ \
248 struct inet6_dev *_idev = (idev); \
249 unsigned long _val = (val); \
250 if (likely(_idev != NULL)) \
251 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, _val); \
252 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, _val);\
253 })
254
255 /* MIBs */
256
257 #define IP6_INC_STATS(net, idev,field) \
258 _DEVINC(net, ipv6, , idev, field)
259 #define __IP6_INC_STATS(net, idev,field) \
260 _DEVINC(net, ipv6, __, idev, field)
261 #define IP6_ADD_STATS(net, idev,field,val) \
262 _DEVADD(net, ipv6, , idev, field, val)
263 #define __IP6_ADD_STATS(net, idev,field,val) \
264 _DEVADD(net, ipv6, __, idev, field, val)
265 #define IP6_UPD_PO_STATS(net, idev,field,val) \
266 _DEVUPD(net, ipv6, , idev, field, val)
267 #define __IP6_UPD_PO_STATS(net, idev,field,val) \
268 _DEVUPD(net, ipv6, __, idev, field, val)
269 #define ICMP6_INC_STATS(net, idev, field) \
270 _DEVINCATOMIC(net, icmpv6, , idev, field)
271 #define __ICMP6_INC_STATS(net, idev, field) \
272 _DEVINCATOMIC(net, icmpv6, __, idev, field)
273
274 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
275 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
276 #define ICMP6MSGIN_INC_STATS(net, idev, field) \
277 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
278
279 struct ip6_ra_chain {
280 struct ip6_ra_chain *next;
281 struct sock *sk;
282 int sel;
283 void (*destructor)(struct sock *);
284 };
285
286 extern struct ip6_ra_chain *ip6_ra_chain;
287 extern rwlock_t ip6_ra_lock;
288
289 /*
290 This structure is prepared by protocol, when parsing
291 ancillary data and passed to IPv6.
292 */
293
294 struct ipv6_txoptions {
295 refcount_t refcnt;
296 /* Length of this structure */
297 int tot_len;
298
299 /* length of extension headers */
300
301 __u16 opt_flen; /* after fragment hdr */
302 __u16 opt_nflen; /* before fragment hdr */
303
304 struct ipv6_opt_hdr *hopopt;
305 struct ipv6_opt_hdr *dst0opt;
306 struct ipv6_rt_hdr *srcrt; /* Routing Header */
307 struct ipv6_opt_hdr *dst1opt;
308 struct rcu_head rcu;
309 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
310 };
311
312 /* flowlabel_reflect sysctl values */
313 enum flowlabel_reflect {
314 FLOWLABEL_REFLECT_ESTABLISHED = 1,
315 FLOWLABEL_REFLECT_TCP_RESET = 2,
316 FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4,
317 };
318
319 struct ip6_flowlabel {
320 struct ip6_flowlabel __rcu *next;
321 __be32 label;
322 atomic_t users;
323 struct in6_addr dst;
324 struct ipv6_txoptions *opt;
325 unsigned long linger;
326 struct rcu_head rcu;
327 u8 share;
328 union {
329 struct pid *pid;
330 kuid_t uid;
331 } owner;
332 unsigned long lastuse;
333 unsigned long expires;
334 struct net *fl_net;
335 };
336
337 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
338 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
339 #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
340
341 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
342 #define IPV6_TCLASS_SHIFT 20
343
344 struct ipv6_fl_socklist {
345 struct ipv6_fl_socklist __rcu *next;
346 struct ip6_flowlabel *fl;
347 struct rcu_head rcu;
348 };
349
350 struct ipcm6_cookie {
351 struct sockcm_cookie sockc;
352 __s16 hlimit;
353 __s16 tclass;
354 __u16 gso_size;
355 __s8 dontfrag;
356 struct ipv6_txoptions *opt;
357 };
358
ipcm6_init_sk(struct ipcm6_cookie * ipc6,const struct sock * sk)359 static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6,
360 const struct sock *sk)
361 {
362 *ipc6 = (struct ipcm6_cookie) {
363 .hlimit = -1,
364 .tclass = inet6_sk(sk)->tclass,
365 .dontfrag = inet6_test_bit(DONTFRAG, sk),
366 };
367
368 sockcm_init(&ipc6->sockc, sk);
369 }
370
txopt_get(const struct ipv6_pinfo * np)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
txopt_put(struct ipv6_txoptions * opt)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 #if IS_ENABLED(CONFIG_IPV6)
394 struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label);
395
396 extern struct static_key_false_deferred ipv6_flowlabel_exclusive;
fl6_sock_lookup(struct sock * sk,__be32 label)397 static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk,
398 __be32 label)
399 {
400 if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key) &&
401 READ_ONCE(sock_net(sk)->ipv6.flowlabel_has_excl))
402 return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT);
403
404 return NULL;
405 }
406 #endif
407
408 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
409 struct ip6_flowlabel *fl,
410 struct ipv6_txoptions *fopt);
411 void fl6_free_socklist(struct sock *sk);
412 int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen);
413 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
414 int flags);
415 int ip6_flowlabel_init(void);
416 void ip6_flowlabel_cleanup(void);
417 bool ip6_autoflowlabel(struct net *net, const struct sock *sk);
418
fl6_sock_release(struct ip6_flowlabel * fl)419 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
420 {
421 if (fl)
422 atomic_dec(&fl->users);
423 }
424
425 enum skb_drop_reason icmpv6_notify(struct sk_buff *skb, u8 type,
426 u8 code, __be32 info);
427
428 void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
429 struct icmp6hdr *thdr, int len);
430
431 int ip6_ra_control(struct sock *sk, int sel);
432
433 int ipv6_parse_hopopts(struct sk_buff *skb);
434
435 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
436 struct ipv6_txoptions *opt);
437 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
438 struct ipv6_txoptions *opt,
439 int newtype,
440 struct ipv6_opt_hdr *newopt);
441 struct ipv6_txoptions *__ipv6_fixup_options(struct ipv6_txoptions *opt_space,
442 struct ipv6_txoptions *opt);
443
444 static inline struct ipv6_txoptions *
ipv6_fixup_options(struct ipv6_txoptions * opt_space,struct ipv6_txoptions * opt)445 ipv6_fixup_options(struct ipv6_txoptions *opt_space, struct ipv6_txoptions *opt)
446 {
447 if (!opt)
448 return NULL;
449 return __ipv6_fixup_options(opt_space, opt);
450 }
451
452 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
453 const struct inet6_skb_parm *opt);
454 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
455 struct ipv6_txoptions *opt);
456
ipv6_accept_ra(const struct inet6_dev * idev)457 static inline bool ipv6_accept_ra(const struct inet6_dev *idev)
458 {
459 s32 accept_ra = READ_ONCE(idev->cnf.accept_ra);
460
461 /* If forwarding is enabled, RA are not accepted unless the special
462 * hybrid mode (accept_ra=2) is enabled.
463 */
464 return READ_ONCE(idev->cnf.forwarding) ? accept_ra == 2 :
465 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);
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
ipv6_addr_scope(const struct in6_addr * addr)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
__ipv6_addr_src_scope(int type)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
ipv6_addr_src_scope(const struct in6_addr * addr)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
__ipv6_addr_needs_scope_id(int type)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
ipv6_iface_scope_id(const struct in6_addr * addr,int iface)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
ipv6_addr_cmp(const struct in6_addr * a1,const struct in6_addr * a2)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
ipv6_masked_addr_cmp(const struct in6_addr * a1,const struct in6_addr * m,const struct in6_addr * a2)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
ipv6_addr_prefix(struct in6_addr * pfx,const struct in6_addr * addr,int plen)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
ipv6_addr_prefix_copy(struct in6_addr * addr,const struct in6_addr * pfx,int plen)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
__ipv6_addr_set_half(__be32 * addr,__be32 wh,__be32 wl)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
ipv6_addr_set(struct in6_addr * addr,__be32 w1,__be32 w2,__be32 w3,__be32 w4)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
ipv6_addr_equal(const struct in6_addr * a1,const struct in6_addr * a2)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
__ipv6_prefix_equal64_half(const __be64 * a1,const __be64 * a2,unsigned int len)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
ipv6_prefix_equal(const struct in6_addr * addr1,const struct in6_addr * addr2,unsigned int prefixlen)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
ipv6_prefix_equal(const struct in6_addr * addr1,const struct in6_addr * addr2,unsigned int prefixlen)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
ipv6_addr_any(const struct in6_addr * a)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
ipv6_addr_hash(const struct in6_addr * a)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() */
__ipv6_addr_jhash(const struct in6_addr * a,const u32 initval)675 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
676 {
677 return jhash2((__force const u32 *)a->s6_addr32,
678 ARRAY_SIZE(a->s6_addr32), initval);
679 }
680
ipv6_addr_loopback(const struct in6_addr * a)681 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
682 {
683 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
684 const __be64 *be = (const __be64 *)a;
685
686 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
687 #else
688 return (a->s6_addr32[0] | a->s6_addr32[1] |
689 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
690 #endif
691 }
692
693 /*
694 * Note that we must __force cast these to unsigned long to make sparse happy,
695 * since all of the endian-annotated types are fixed size regardless of arch.
696 */
ipv6_addr_v4mapped(const struct in6_addr * a)697 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
698 {
699 return (
700 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
701 *(unsigned long *)a |
702 #else
703 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
704 #endif
705 (__force unsigned long)(a->s6_addr32[2] ^
706 cpu_to_be32(0x0000ffff))) == 0UL;
707 }
708
ipv6_addr_v4mapped_loopback(const struct in6_addr * a)709 static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a)
710 {
711 return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]);
712 }
713
ipv6_portaddr_hash(const struct net * net,const struct in6_addr * addr6,unsigned int port)714 static inline u32 ipv6_portaddr_hash(const struct net *net,
715 const struct in6_addr *addr6,
716 unsigned int port)
717 {
718 unsigned int hash, mix = net_hash_mix(net);
719
720 if (ipv6_addr_any(addr6))
721 hash = jhash_1word(0, mix);
722 else if (ipv6_addr_v4mapped(addr6))
723 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
724 else
725 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
726
727 return hash ^ port;
728 }
729
730 /*
731 * Check for a RFC 4843 ORCHID address
732 * (Overlay Routable Cryptographic Hash Identifiers)
733 */
ipv6_addr_orchid(const struct in6_addr * a)734 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
735 {
736 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
737 }
738
ipv6_addr_is_multicast(const struct in6_addr * addr)739 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
740 {
741 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
742 }
743
ipv6_addr_set_v4mapped(const __be32 addr,struct in6_addr * v4mapped)744 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
745 struct in6_addr *v4mapped)
746 {
747 ipv6_addr_set(v4mapped,
748 0, 0,
749 htonl(0x0000FFFF),
750 addr);
751 }
752
753 /*
754 * find the first different bit between two addresses
755 * length of address must be a multiple of 32bits
756 */
__ipv6_addr_diff32(const void * token1,const void * token2,int addrlen)757 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
758 {
759 const __be32 *a1 = token1, *a2 = token2;
760 int i;
761
762 addrlen >>= 2;
763
764 for (i = 0; i < addrlen; i++) {
765 __be32 xb = a1[i] ^ a2[i];
766 if (xb)
767 return i * 32 + 31 - __fls(ntohl(xb));
768 }
769
770 /*
771 * we should *never* get to this point since that
772 * would mean the addrs are equal
773 *
774 * However, we do get to it 8) And exactly, when
775 * addresses are equal 8)
776 *
777 * ip route add 1111::/128 via ...
778 * ip route add 1111::/64 via ...
779 * and we are here.
780 *
781 * Ideally, this function should stop comparison
782 * at prefix length. It does not, but it is still OK,
783 * if returned value is greater than prefix length.
784 * --ANK (980803)
785 */
786 return addrlen << 5;
787 }
788
789 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
__ipv6_addr_diff64(const void * token1,const void * token2,int addrlen)790 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
791 {
792 const __be64 *a1 = token1, *a2 = token2;
793 int i;
794
795 addrlen >>= 3;
796
797 for (i = 0; i < addrlen; i++) {
798 __be64 xb = a1[i] ^ a2[i];
799 if (xb)
800 return i * 64 + 63 - __fls(be64_to_cpu(xb));
801 }
802
803 return addrlen << 6;
804 }
805 #endif
806
__ipv6_addr_diff(const void * token1,const void * token2,int addrlen)807 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
808 {
809 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
810 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
811 return __ipv6_addr_diff64(token1, token2, addrlen);
812 #endif
813 return __ipv6_addr_diff32(token1, token2, addrlen);
814 }
815
ipv6_addr_diff(const struct in6_addr * a1,const struct in6_addr * a2)816 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
817 {
818 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
819 }
820
821 __be32 ipv6_select_ident(struct net *net,
822 const struct in6_addr *daddr,
823 const struct in6_addr *saddr);
824 __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
825
826 int ip6_dst_hoplimit(struct dst_entry *dst);
827
ip6_sk_dst_hoplimit(struct ipv6_pinfo * np,struct flowi6 * fl6,struct dst_entry * dst)828 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
829 struct dst_entry *dst)
830 {
831 int hlimit;
832
833 if (ipv6_addr_is_multicast(&fl6->daddr))
834 hlimit = READ_ONCE(np->mcast_hops);
835 else
836 hlimit = READ_ONCE(np->hop_limit);
837 if (hlimit < 0)
838 hlimit = ip6_dst_hoplimit(dst);
839 return hlimit;
840 }
841
842 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
843 * Equivalent to : flow->v6addrs.src = iph->saddr;
844 * flow->v6addrs.dst = iph->daddr;
845 */
iph_to_flow_copy_v6addrs(struct flow_keys * flow,const struct ipv6hdr * iph)846 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
847 const struct ipv6hdr *iph)
848 {
849 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
850 offsetof(typeof(flow->addrs), v6addrs.src) +
851 sizeof(flow->addrs.v6addrs.src));
852 memcpy(&flow->addrs.v6addrs, &iph->addrs, sizeof(flow->addrs.v6addrs));
853 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
854 }
855
856 #if IS_ENABLED(CONFIG_IPV6)
857
ipv6_can_nonlocal_bind(const struct net * net,const struct inet_sock * inet)858 static inline bool ipv6_can_nonlocal_bind(const struct net *net,
859 const struct inet_sock *inet)
860 {
861 return READ_ONCE(net->ipv6.sysctl.ip_nonlocal_bind) ||
862 test_bit(INET_FLAGS_FREEBIND, &inet->inet_flags) ||
863 test_bit(INET_FLAGS_TRANSPARENT, &inet->inet_flags);
864 }
865
866 /* Sysctl settings for net ipv6.auto_flowlabels */
867 #define IP6_AUTO_FLOW_LABEL_OFF 0
868 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1
869 #define IP6_AUTO_FLOW_LABEL_OPTIN 2
870 #define IP6_AUTO_FLOW_LABEL_FORCED 3
871
872 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
873
874 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
875
ip6_make_flowlabel(const struct net * net,struct sk_buff * skb,__be32 flowlabel,bool autolabel,struct flowi6 * fl6)876 static inline __be32 ip6_make_flowlabel(const struct net *net,
877 struct sk_buff *skb,
878 __be32 flowlabel, bool autolabel,
879 struct flowi6 *fl6)
880 {
881 u8 auto_flowlabels;
882 u32 hash;
883
884 /* @flowlabel may include more than a flow label, eg, the traffic class.
885 * Here we want only the flow label value.
886 */
887 flowlabel &= IPV6_FLOWLABEL_MASK;
888
889 if (flowlabel)
890 return flowlabel;
891
892 auto_flowlabels = READ_ONCE(net->ipv6.sysctl.auto_flowlabels);
893 if (auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
894 (!autolabel && auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
895 return flowlabel;
896
897 hash = skb_get_hash_flowi6(skb, fl6);
898
899 /* Since this is being sent on the wire obfuscate hash a bit
900 * to minimize possibility that any useful information to an
901 * attacker is leaked. Only lower 20 bits are relevant.
902 */
903 hash = rol32(hash, 16);
904
905 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
906
907 if (READ_ONCE(net->ipv6.sysctl.flowlabel_state_ranges))
908 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
909
910 return flowlabel;
911 }
912
ip6_default_np_autolabel(const struct net * net)913 static inline int ip6_default_np_autolabel(const struct net *net)
914 {
915 switch (READ_ONCE(net->ipv6.sysctl.auto_flowlabels)) {
916 case IP6_AUTO_FLOW_LABEL_OFF:
917 case IP6_AUTO_FLOW_LABEL_OPTIN:
918 default:
919 return 0;
920 case IP6_AUTO_FLOW_LABEL_OPTOUT:
921 case IP6_AUTO_FLOW_LABEL_FORCED:
922 return 1;
923 }
924 }
925 #else
ip6_make_flowlabel(const struct net * net,struct sk_buff * skb,__be32 flowlabel,bool autolabel,struct flowi6 * fl6)926 static inline __be32 ip6_make_flowlabel(const struct net *net, struct sk_buff *skb,
927 __be32 flowlabel, bool autolabel,
928 struct flowi6 *fl6)
929 {
930 return flowlabel;
931 }
ip6_default_np_autolabel(const struct net * net)932 static inline int ip6_default_np_autolabel(const struct net *net)
933 {
934 return 0;
935 }
936 #endif
937
938 #if IS_ENABLED(CONFIG_IPV6)
ip6_multipath_hash_policy(const struct net * net)939 static inline int ip6_multipath_hash_policy(const struct net *net)
940 {
941 return READ_ONCE(net->ipv6.sysctl.multipath_hash_policy);
942 }
ip6_multipath_hash_fields(const struct net * net)943 static inline u32 ip6_multipath_hash_fields(const struct net *net)
944 {
945 return READ_ONCE(net->ipv6.sysctl.multipath_hash_fields);
946 }
947 #else
ip6_multipath_hash_policy(const struct net * net)948 static inline int ip6_multipath_hash_policy(const struct net *net)
949 {
950 return 0;
951 }
ip6_multipath_hash_fields(const struct net * net)952 static inline u32 ip6_multipath_hash_fields(const struct net *net)
953 {
954 return 0;
955 }
956 #endif
957
958 /*
959 * Header manipulation
960 */
ip6_flow_hdr(struct ipv6hdr * hdr,unsigned int tclass,__be32 flowlabel)961 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
962 __be32 flowlabel)
963 {
964 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
965 }
966
ip6_flowinfo(const struct ipv6hdr * hdr)967 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
968 {
969 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
970 }
971
ip6_flowlabel(const struct ipv6hdr * hdr)972 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
973 {
974 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
975 }
976
ip6_tclass(__be32 flowinfo)977 static inline u8 ip6_tclass(__be32 flowinfo)
978 {
979 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
980 }
981
ip6_dscp(__be32 flowinfo)982 static inline dscp_t ip6_dscp(__be32 flowinfo)
983 {
984 return inet_dsfield_to_dscp(ip6_tclass(flowinfo));
985 }
986
ip6_make_flowinfo(unsigned int tclass,__be32 flowlabel)987 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
988 {
989 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
990 }
991
flowi6_get_flowlabel(const struct flowi6 * fl6)992 static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6)
993 {
994 return fl6->flowlabel & IPV6_FLOWLABEL_MASK;
995 }
996
997 /*
998 * Prototypes exported by ipv6
999 */
1000
1001 /*
1002 * rcv function (called from netdevice level)
1003 */
1004
1005 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
1006 struct packet_type *pt, struct net_device *orig_dev);
1007 void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
1008 struct net_device *orig_dev);
1009
1010 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
1011
1012 /*
1013 * upper-layer output functions
1014 */
1015 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
1016 __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority);
1017
1018 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
1019
1020 int ip6_append_data(struct sock *sk,
1021 int getfrag(void *from, char *to, int offset, int len,
1022 int odd, struct sk_buff *skb),
1023 void *from, size_t length, int transhdrlen,
1024 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
1025 struct rt6_info *rt, unsigned int flags);
1026
1027 int ip6_push_pending_frames(struct sock *sk);
1028
1029 void ip6_flush_pending_frames(struct sock *sk);
1030
1031 int ip6_send_skb(struct sk_buff *skb);
1032
1033 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
1034 struct inet_cork_full *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, size_t length, int transhdrlen,
1039 struct ipcm6_cookie *ipc6,
1040 struct rt6_info *rt, unsigned int flags,
1041 struct inet_cork_full *cork);
1042
ip6_finish_skb(struct sock * sk)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 }
1047
1048 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
1049 struct flowi6 *fl6);
1050 #if IS_ENABLED(CONFIG_IPV6)
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 #else
ip6_dst_lookup_flow(struct net * net,const struct sock * sk,struct flowi6 * fl6,const struct in6_addr * final_dst)1054 static inline struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk,
1055 struct flowi6 *fl6,
1056 const struct in6_addr *final_dst)
1057 {
1058 return ERR_PTR(-EAFNOSUPPORT);
1059 }
1060 #endif
1061
1062 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
1063 const struct in6_addr *final_dst,
1064 bool connected);
1065 struct dst_entry *ip6_blackhole_route(struct net *net,
1066 struct dst_entry *orig_dst);
1067
1068 /*
1069 * skb processing functions
1070 */
1071
1072 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1073 int ip6_forward(struct sk_buff *skb);
1074 int ip6_input(struct sk_buff *skb);
1075 int ip6_mc_input(struct sk_buff *skb);
1076 void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
1077 bool have_final);
1078
1079 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1080 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1081
1082 /*
1083 * Extension header (options) processing
1084 */
1085
1086 u8 ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1087 u8 proto, struct in6_addr **daddr_p,
1088 struct in6_addr *saddr);
1089 u8 ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1090 u8 proto);
1091
1092 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
1093 __be16 *frag_offp);
1094
1095 bool ipv6_ext_hdr(u8 nexthdr);
1096
1097 enum {
1098 IP6_FH_F_FRAG = (1 << 0),
1099 IP6_FH_F_AUTH = (1 << 1),
1100 IP6_FH_F_SKIP_RH = (1 << 2),
1101 };
1102
1103 /* find specified header and get offset to it */
1104 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
1105 unsigned short *fragoff, int *fragflg);
1106
1107 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
1108
1109 struct in6_addr *__fl6_update_dst(struct flowi6 *fl6,
1110 const struct ipv6_txoptions *opt,
1111 struct in6_addr *orig);
1112
1113 static inline struct in6_addr *
fl6_update_dst(struct flowi6 * fl6,const struct ipv6_txoptions * opt,struct in6_addr * orig)1114 fl6_update_dst(struct flowi6 *fl6, const struct ipv6_txoptions *opt,
1115 struct in6_addr *orig)
1116 {
1117 if (likely(!opt))
1118 return NULL;
1119
1120 return __fl6_update_dst(fl6, opt, orig);
1121 }
1122
1123 /*
1124 * socket options (ipv6_sockglue.c)
1125 */
1126 DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount);
1127
1128 int do_ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1129 unsigned int optlen);
1130 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1131 unsigned int optlen);
1132 int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1133 sockptr_t optval, sockptr_t optlen);
1134 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1135 char __user *optval, int __user *optlen);
1136
1137 int __ip6_datagram_connect(struct sock *sk, struct sockaddr_unsized *addr,
1138 int addr_len);
1139 int ip6_datagram_connect(struct sock *sk, struct sockaddr_unsized *addr, int addr_len);
1140 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr_unsized *addr,
1141 int addr_len);
1142 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
1143 void ip6_datagram_release_cb(struct sock *sk);
1144
1145 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
1146 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
1147 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1148 u32 info, u8 *payload);
1149 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
1150 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
1151
1152 void inet6_cleanup_sock(struct sock *sk);
1153 void inet6_sock_destruct(struct sock *sk);
1154 int inet6_release(struct socket *sock);
1155 int __inet6_bind(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len,
1156 u32 flags);
1157 int inet6_bind(struct socket *sock, struct sockaddr_unsized *uaddr, int addr_len);
1158 int inet6_bind_sk(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len);
1159 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
1160 int peer);
1161 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1162 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd,
1163 unsigned long arg);
1164
1165 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1166 struct sock *sk);
1167 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size);
1168 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1169 int flags);
1170
1171 /*
1172 * reassembly.c
1173 */
1174 extern const struct proto_ops inet6_stream_ops;
1175 extern const struct proto_ops inet6_dgram_ops;
1176 extern const struct proto_ops inet6_sockraw_ops;
1177
1178 struct group_source_req;
1179 struct group_filter;
1180
1181 int ip6_mc_source(int add, int omode, struct sock *sk,
1182 struct group_source_req *pgsr);
1183 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
1184 struct sockaddr_storage *list);
1185 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1186 sockptr_t optval, size_t ss_offset);
1187
1188 #ifdef CONFIG_PROC_FS
1189 int ac6_proc_init(struct net *net);
1190 void ac6_proc_exit(struct net *net);
1191 int raw6_proc_init(void);
1192 void raw6_proc_exit(void);
1193 int tcp6_proc_init(struct net *net);
1194 void tcp6_proc_exit(struct net *net);
1195 int udp6_proc_init(struct net *net);
1196 void udp6_proc_exit(struct net *net);
1197 int ipv6_misc_proc_init(void);
1198 void ipv6_misc_proc_exit(void);
1199 int snmp6_register_dev(struct inet6_dev *idev);
1200 int snmp6_unregister_dev(struct inet6_dev *idev);
1201
1202 #else
ac6_proc_init(struct net * net)1203 static inline int ac6_proc_init(struct net *net) { return 0; }
ac6_proc_exit(struct net * net)1204 static inline void ac6_proc_exit(struct net *net) { }
snmp6_register_dev(struct inet6_dev * idev)1205 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
snmp6_unregister_dev(struct inet6_dev * idev)1206 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1207 #endif
1208
1209 #ifdef CONFIG_SYSCTL
1210 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1211 size_t ipv6_icmp_sysctl_table_size(void);
1212 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1213 size_t ipv6_route_sysctl_table_size(struct net *net);
1214 int ipv6_sysctl_register(void);
1215 void ipv6_sysctl_unregister(void);
1216 #endif
1217
1218 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1219 const struct in6_addr *addr);
1220 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
1221 const struct in6_addr *addr, unsigned int mode);
1222 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1223 const struct in6_addr *addr);
1224
ip6_sock_set_v6only(struct sock * sk)1225 static inline int ip6_sock_set_v6only(struct sock *sk)
1226 {
1227 int ret = 0;
1228
1229 lock_sock(sk);
1230 if (inet_sk(sk)->inet_num)
1231 ret = -EINVAL;
1232 else
1233 sk->sk_ipv6only = true;
1234 release_sock(sk);
1235 return ret;
1236 }
1237
ip6_sock_set_recverr(struct sock * sk)1238 static inline void ip6_sock_set_recverr(struct sock *sk)
1239 {
1240 inet6_set_bit(RECVERR6, sk);
1241 }
1242
1243 #define IPV6_PREFER_SRC_MASK (IPV6_PREFER_SRC_TMP | IPV6_PREFER_SRC_PUBLIC | \
1244 IPV6_PREFER_SRC_COA)
1245
ip6_sock_set_addr_preferences(struct sock * sk,int val)1246 static inline int ip6_sock_set_addr_preferences(struct sock *sk, int val)
1247 {
1248 unsigned int prefmask = ~IPV6_PREFER_SRC_MASK;
1249 unsigned int pref = 0;
1250
1251 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
1252 switch (val & (IPV6_PREFER_SRC_PUBLIC |
1253 IPV6_PREFER_SRC_TMP |
1254 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
1255 case IPV6_PREFER_SRC_PUBLIC:
1256 pref |= IPV6_PREFER_SRC_PUBLIC;
1257 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1258 IPV6_PREFER_SRC_TMP);
1259 break;
1260 case IPV6_PREFER_SRC_TMP:
1261 pref |= IPV6_PREFER_SRC_TMP;
1262 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1263 IPV6_PREFER_SRC_TMP);
1264 break;
1265 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
1266 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1267 IPV6_PREFER_SRC_TMP);
1268 break;
1269 case 0:
1270 break;
1271 default:
1272 return -EINVAL;
1273 }
1274
1275 /* check HOME/COA conflicts */
1276 switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) {
1277 case IPV6_PREFER_SRC_HOME:
1278 prefmask &= ~IPV6_PREFER_SRC_COA;
1279 break;
1280 case IPV6_PREFER_SRC_COA:
1281 pref |= IPV6_PREFER_SRC_COA;
1282 break;
1283 case 0:
1284 break;
1285 default:
1286 return -EINVAL;
1287 }
1288
1289 /* check CGA/NONCGA conflicts */
1290 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
1291 case IPV6_PREFER_SRC_CGA:
1292 case IPV6_PREFER_SRC_NONCGA:
1293 case 0:
1294 break;
1295 default:
1296 return -EINVAL;
1297 }
1298
1299 WRITE_ONCE(inet6_sk(sk)->srcprefs,
1300 (READ_ONCE(inet6_sk(sk)->srcprefs) & prefmask) | pref);
1301 return 0;
1302 }
1303
ip6_sock_set_recvpktinfo(struct sock * sk)1304 static inline void ip6_sock_set_recvpktinfo(struct sock *sk)
1305 {
1306 lock_sock(sk);
1307 inet6_sk(sk)->rxopt.bits.rxinfo = true;
1308 release_sock(sk);
1309 }
1310
1311 #define IPV6_ADDR_WORDS 4
1312
ipv6_addr_cpu_to_be32(__be32 * dst,const u32 * src)1313 static inline void ipv6_addr_cpu_to_be32(__be32 *dst, const u32 *src)
1314 {
1315 cpu_to_be32_array(dst, src, IPV6_ADDR_WORDS);
1316 }
1317
ipv6_addr_be32_to_cpu(u32 * dst,const __be32 * src)1318 static inline void ipv6_addr_be32_to_cpu(u32 *dst, const __be32 *src)
1319 {
1320 be32_to_cpu_array(dst, src, IPV6_ADDR_WORDS);
1321 }
1322
1323 #endif /* _NET_IPV6_H */
1324