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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
24struct 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
147struct frag_hdr {
148 __u8 nexthdr;
149 __u8 reserved;
150 __be16 frag_off;
151 __be32 identification;
152};
153
154/*
155 * Jumbo payload option, as described in RFC 2675 2.
156 */
157struct hop_jumbo_hdr {
158 u8 nexthdr;
159 u8 hdrlen;
160 u8 tlv_type; /* IPV6_TLV_JUMBO, 0xC2 */
161 u8 tlv_len; /* 4 */
162 __be32 jumbo_payload_len;
163};
164
165#define IP6_MF 0x0001
166#define IP6_OFFSET 0xFFF8
167
168struct ip6_fraglist_iter {
169 struct ipv6hdr *tmp_hdr;
170 struct sk_buff *frag;
171 int offset;
172 unsigned int hlen;
173 __be32 frag_id;
174 u8 nexthdr;
175};
176
177int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr,
178 u8 nexthdr, __be32 frag_id,
179 struct ip6_fraglist_iter *iter);
180void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter);
181
182static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter)
183{
184 struct sk_buff *skb = iter->frag;
185
186 iter->frag = skb->next;
187 skb_mark_not_on_list(skb);
188
189 return skb;
190}
191
192struct ip6_frag_state {
193 u8 *prevhdr;
194 unsigned int hlen;
195 unsigned int mtu;
196 unsigned int left;
197 int offset;
198 int ptr;
199 int hroom;
200 int troom;
201 __be32 frag_id;
202 u8 nexthdr;
203};
204
205void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu,
206 unsigned short needed_tailroom, int hdr_room, u8 *prevhdr,
207 u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state);
208struct sk_buff *ip6_frag_next(struct sk_buff *skb,
209 struct ip6_frag_state *state);
210
211#define IP6_REPLY_MARK(net, mark) \
212 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
213
214#include <net/sock.h>
215
216/* sysctls */
217extern int sysctl_mld_max_msf;
218extern int sysctl_mld_qrv;
219
220#define _DEVINC(net, statname, mod, idev, field) \
221({ \
222 struct inet6_dev *_idev = (idev); \
223 if (likely(_idev != NULL)) \
224 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
225 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
226})
227
228/* per device counters are atomic_long_t */
229#define _DEVINCATOMIC(net, statname, mod, idev, field) \
230({ \
231 struct inet6_dev *_idev = (idev); \
232 if (likely(_idev != NULL)) \
233 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
234 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
235})
236
237/* per device and per net counters are atomic_long_t */
238#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
239({ \
240 struct inet6_dev *_idev = (idev); \
241 if (likely(_idev != NULL)) \
242 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
243 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
244})
245
246#define _DEVADD(net, statname, mod, idev, field, val) \
247({ \
248 struct inet6_dev *_idev = (idev); \
249 if (likely(_idev != NULL)) \
250 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
251 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
252})
253
254#define _DEVUPD(net, statname, mod, idev, field, val) \
255({ \
256 struct inet6_dev *_idev = (idev); \
257 if (likely(_idev != NULL)) \
258 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
259 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
260})
261
262/* MIBs */
263
264#define IP6_INC_STATS(net, idev,field) \
265 _DEVINC(net, ipv6, , idev, field)
266#define __IP6_INC_STATS(net, idev,field) \
267 _DEVINC(net, ipv6, __, idev, field)
268#define IP6_ADD_STATS(net, idev,field,val) \
269 _DEVADD(net, ipv6, , idev, field, val)
270#define __IP6_ADD_STATS(net, idev,field,val) \
271 _DEVADD(net, ipv6, __, idev, field, val)
272#define IP6_UPD_PO_STATS(net, idev,field,val) \
273 _DEVUPD(net, ipv6, , idev, field, val)
274#define __IP6_UPD_PO_STATS(net, idev,field,val) \
275 _DEVUPD(net, ipv6, __, idev, field, val)
276#define ICMP6_INC_STATS(net, idev, field) \
277 _DEVINCATOMIC(net, icmpv6, , idev, field)
278#define __ICMP6_INC_STATS(net, idev, field) \
279 _DEVINCATOMIC(net, icmpv6, __, idev, field)
280
281#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
282 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
283#define ICMP6MSGIN_INC_STATS(net, idev, field) \
284 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
285
286struct ip6_ra_chain {
287 struct ip6_ra_chain *next;
288 struct sock *sk;
289 int sel;
290 void (*destructor)(struct sock *);
291};
292
293extern struct ip6_ra_chain *ip6_ra_chain;
294extern rwlock_t ip6_ra_lock;
295
296/*
297 This structure is prepared by protocol, when parsing
298 ancillary data and passed to IPv6.
299 */
300
301struct ipv6_txoptions {
302 refcount_t refcnt;
303 /* Length of this structure */
304 int tot_len;
305
306 /* length of extension headers */
307
308 __u16 opt_flen; /* after fragment hdr */
309 __u16 opt_nflen; /* before fragment hdr */
310
311 struct ipv6_opt_hdr *hopopt;
312 struct ipv6_opt_hdr *dst0opt;
313 struct ipv6_rt_hdr *srcrt; /* Routing Header */
314 struct ipv6_opt_hdr *dst1opt;
315 struct rcu_head rcu;
316 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
317};
318
319/* flowlabel_reflect sysctl values */
320enum flowlabel_reflect {
321 FLOWLABEL_REFLECT_ESTABLISHED = 1,
322 FLOWLABEL_REFLECT_TCP_RESET = 2,
323 FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4,
324};
325
326struct ip6_flowlabel {
327 struct ip6_flowlabel __rcu *next;
328 __be32 label;
329 atomic_t users;
330 struct in6_addr dst;
331 struct ipv6_txoptions *opt;
332 unsigned long linger;
333 struct rcu_head rcu;
334 u8 share;
335 union {
336 struct pid *pid;
337 kuid_t uid;
338 } owner;
339 unsigned long lastuse;
340 unsigned long expires;
341 struct net *fl_net;
342};
343
344#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
345#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
346#define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
347
348#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
349#define IPV6_TCLASS_SHIFT 20
350
351struct ipv6_fl_socklist {
352 struct ipv6_fl_socklist __rcu *next;
353 struct ip6_flowlabel *fl;
354 struct rcu_head rcu;
355};
356
357struct ipcm6_cookie {
358 struct sockcm_cookie sockc;
359 __s16 hlimit;
360 __s16 tclass;
361 __u16 gso_size;
362 __s8 dontfrag;
363 struct ipv6_txoptions *opt;
364};
365
366static inline void ipcm6_init(struct ipcm6_cookie *ipc6)
367{
368 *ipc6 = (struct ipcm6_cookie) {
369 .hlimit = -1,
370 .tclass = -1,
371 .dontfrag = -1,
372 };
373}
374
375static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6,
376 const struct ipv6_pinfo *np)
377{
378 *ipc6 = (struct ipcm6_cookie) {
379 .hlimit = -1,
380 .tclass = np->tclass,
381 .dontfrag = np->dontfrag,
382 };
383}
384
385static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
386{
387 struct ipv6_txoptions *opt;
388
389 rcu_read_lock();
390 opt = rcu_dereference(np->opt);
391 if (opt) {
392 if (!refcount_inc_not_zero(&opt->refcnt))
393 opt = NULL;
394 else
395 opt = rcu_pointer_handoff(opt);
396 }
397 rcu_read_unlock();
398 return opt;
399}
400
401static inline void txopt_put(struct ipv6_txoptions *opt)
402{
403 if (opt && refcount_dec_and_test(&opt->refcnt))
404 kfree_rcu(opt, rcu);
405}
406
407#if IS_ENABLED(CONFIG_IPV6)
408struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label);
409
410extern struct static_key_false_deferred ipv6_flowlabel_exclusive;
411static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk,
412 __be32 label)
413{
414 if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key) &&
415 READ_ONCE(sock_net(sk)->ipv6.flowlabel_has_excl))
416 return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT);
417
418 return NULL;
419}
420#endif
421
422struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
423 struct ip6_flowlabel *fl,
424 struct ipv6_txoptions *fopt);
425void fl6_free_socklist(struct sock *sk);
426int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen);
427int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
428 int flags);
429int ip6_flowlabel_init(void);
430void ip6_flowlabel_cleanup(void);
431bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
432
433static inline void fl6_sock_release(struct ip6_flowlabel *fl)
434{
435 if (fl)
436 atomic_dec(&fl->users);
437}
438
439void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
440
441void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
442 struct icmp6hdr *thdr, int len);
443
444int ip6_ra_control(struct sock *sk, int sel);
445
446int ipv6_parse_hopopts(struct sk_buff *skb);
447
448struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
449 struct ipv6_txoptions *opt);
450struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
451 struct ipv6_txoptions *opt,
452 int newtype,
453 struct ipv6_opt_hdr *newopt);
454struct ipv6_txoptions *__ipv6_fixup_options(struct ipv6_txoptions *opt_space,
455 struct ipv6_txoptions *opt);
456
457static inline struct ipv6_txoptions *
458ipv6_fixup_options(struct ipv6_txoptions *opt_space, struct ipv6_txoptions *opt)
459{
460 if (!opt)
461 return NULL;
462 return __ipv6_fixup_options(opt_space, opt);
463}
464
465bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
466 const struct inet6_skb_parm *opt);
467struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
468 struct ipv6_txoptions *opt);
469
470/* This helper is specialized for BIG TCP needs.
471 * It assumes the hop_jumbo_hdr will immediately follow the IPV6 header.
472 * It assumes headers are already in skb->head.
473 * Returns 0, or IPPROTO_TCP if a BIG TCP packet is there.
474 */
475static inline int ipv6_has_hopopt_jumbo(const struct sk_buff *skb)
476{
477 const struct hop_jumbo_hdr *jhdr;
478 const struct ipv6hdr *nhdr;
479
480 if (likely(skb->len <= GRO_LEGACY_MAX_SIZE))
481 return 0;
482
483 if (skb->protocol != htons(ETH_P_IPV6))
484 return 0;
485
486 if (skb_network_offset(skb) +
487 sizeof(struct ipv6hdr) +
488 sizeof(struct hop_jumbo_hdr) > skb_headlen(skb))
489 return 0;
490
491 nhdr = ipv6_hdr(skb);
492
493 if (nhdr->nexthdr != NEXTHDR_HOP)
494 return 0;
495
496 jhdr = (const struct hop_jumbo_hdr *) (nhdr + 1);
497 if (jhdr->tlv_type != IPV6_TLV_JUMBO || jhdr->hdrlen != 0 ||
498 jhdr->nexthdr != IPPROTO_TCP)
499 return 0;
500 return jhdr->nexthdr;
501}
502
503/* Return 0 if HBH header is successfully removed
504 * Or if HBH removal is unnecessary (packet is not big TCP)
505 * Return error to indicate dropping the packet
506 */
507static inline int ipv6_hopopt_jumbo_remove(struct sk_buff *skb)
508{
509 const int hophdr_len = sizeof(struct hop_jumbo_hdr);
510 int nexthdr = ipv6_has_hopopt_jumbo(skb);
511 struct ipv6hdr *h6;
512
513 if (!nexthdr)
514 return 0;
515
516 if (skb_cow_head(skb, 0))
517 return -1;
518
519 /* Remove the HBH header.
520 * Layout: [Ethernet header][IPv6 header][HBH][L4 Header]
521 */
522 memmove(skb_mac_header(skb) + hophdr_len, skb_mac_header(skb),
523 skb_network_header(skb) - skb_mac_header(skb) +
524 sizeof(struct ipv6hdr));
525
526 __skb_pull(skb, hophdr_len);
527 skb->network_header += hophdr_len;
528 skb->mac_header += hophdr_len;
529
530 h6 = ipv6_hdr(skb);
531 h6->nexthdr = nexthdr;
532
533 return 0;
534}
535
536static inline bool ipv6_accept_ra(struct inet6_dev *idev)
537{
538 /* If forwarding is enabled, RA are not accepted unless the special
539 * hybrid mode (accept_ra=2) is enabled.
540 */
541 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
542 idev->cnf.accept_ra;
543}
544
545#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
546#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
547#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
548
549int __ipv6_addr_type(const struct in6_addr *addr);
550static inline int ipv6_addr_type(const struct in6_addr *addr)
551{
552 return __ipv6_addr_type(addr) & 0xffff;
553}
554
555static inline int ipv6_addr_scope(const struct in6_addr *addr)
556{
557 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
558}
559
560static inline int __ipv6_addr_src_scope(int type)
561{
562 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
563}
564
565static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
566{
567 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
568}
569
570static inline bool __ipv6_addr_needs_scope_id(int type)
571{
572 return type & IPV6_ADDR_LINKLOCAL ||
573 (type & IPV6_ADDR_MULTICAST &&
574 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
575}
576
577static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
578{
579 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
580}
581
582static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
583{
584 return memcmp(a1, a2, sizeof(struct in6_addr));
585}
586
587static inline bool
588ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
589 const struct in6_addr *a2)
590{
591#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
592 const unsigned long *ul1 = (const unsigned long *)a1;
593 const unsigned long *ulm = (const unsigned long *)m;
594 const unsigned long *ul2 = (const unsigned long *)a2;
595
596 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
597 ((ul1[1] ^ ul2[1]) & ulm[1]));
598#else
599 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
600 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
601 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
602 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
603#endif
604}
605
606static inline void ipv6_addr_prefix(struct in6_addr *pfx,
607 const struct in6_addr *addr,
608 int plen)
609{
610 /* caller must guarantee 0 <= plen <= 128 */
611 int o = plen >> 3,
612 b = plen & 0x7;
613
614 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
615 memcpy(pfx->s6_addr, addr, o);
616 if (b != 0)
617 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
618}
619
620static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
621 const struct in6_addr *pfx,
622 int plen)
623{
624 /* caller must guarantee 0 <= plen <= 128 */
625 int o = plen >> 3,
626 b = plen & 0x7;
627
628 memcpy(addr->s6_addr, pfx, o);
629 if (b != 0) {
630 addr->s6_addr[o] &= ~(0xff00 >> b);
631 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
632 }
633}
634
635static inline void __ipv6_addr_set_half(__be32 *addr,
636 __be32 wh, __be32 wl)
637{
638#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
639#if defined(__BIG_ENDIAN)
640 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
641 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
642 return;
643 }
644#elif defined(__LITTLE_ENDIAN)
645 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
646 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
647 return;
648 }
649#endif
650#endif
651 addr[0] = wh;
652 addr[1] = wl;
653}
654
655static inline void ipv6_addr_set(struct in6_addr *addr,
656 __be32 w1, __be32 w2,
657 __be32 w3, __be32 w4)
658{
659 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
660 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
661}
662
663static inline bool ipv6_addr_equal(const struct in6_addr *a1,
664 const struct in6_addr *a2)
665{
666#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
667 const unsigned long *ul1 = (const unsigned long *)a1;
668 const unsigned long *ul2 = (const unsigned long *)a2;
669
670 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
671#else
672 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
673 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
674 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
675 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
676#endif
677}
678
679#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
680static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
681 const __be64 *a2,
682 unsigned int len)
683{
684 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
685 return false;
686 return true;
687}
688
689static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
690 const struct in6_addr *addr2,
691 unsigned int prefixlen)
692{
693 const __be64 *a1 = (const __be64 *)addr1;
694 const __be64 *a2 = (const __be64 *)addr2;
695
696 if (prefixlen >= 64) {
697 if (a1[0] ^ a2[0])
698 return false;
699 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
700 }
701 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
702}
703#else
704static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
705 const struct in6_addr *addr2,
706 unsigned int prefixlen)
707{
708 const __be32 *a1 = addr1->s6_addr32;
709 const __be32 *a2 = addr2->s6_addr32;
710 unsigned int pdw, pbi;
711
712 /* check complete u32 in prefix */
713 pdw = prefixlen >> 5;
714 if (pdw && memcmp(a1, a2, pdw << 2))
715 return false;
716
717 /* check incomplete u32 in prefix */
718 pbi = prefixlen & 0x1f;
719 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
720 return false;
721
722 return true;
723}
724#endif
725
726static inline bool ipv6_addr_any(const struct in6_addr *a)
727{
728#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
729 const unsigned long *ul = (const unsigned long *)a;
730
731 return (ul[0] | ul[1]) == 0UL;
732#else
733 return (a->s6_addr32[0] | a->s6_addr32[1] |
734 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
735#endif
736}
737
738static inline u32 ipv6_addr_hash(const struct in6_addr *a)
739{
740#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
741 const unsigned long *ul = (const unsigned long *)a;
742 unsigned long x = ul[0] ^ ul[1];
743
744 return (u32)(x ^ (x >> 32));
745#else
746 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
747 a->s6_addr32[2] ^ a->s6_addr32[3]);
748#endif
749}
750
751/* more secured version of ipv6_addr_hash() */
752static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
753{
754 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
755
756 return jhash_3words(v,
757 (__force u32)a->s6_addr32[2],
758 (__force u32)a->s6_addr32[3],
759 initval);
760}
761
762static inline bool ipv6_addr_loopback(const struct in6_addr *a)
763{
764#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
765 const __be64 *be = (const __be64 *)a;
766
767 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
768#else
769 return (a->s6_addr32[0] | a->s6_addr32[1] |
770 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
771#endif
772}
773
774/*
775 * Note that we must __force cast these to unsigned long to make sparse happy,
776 * since all of the endian-annotated types are fixed size regardless of arch.
777 */
778static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
779{
780 return (
781#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
782 *(unsigned long *)a |
783#else
784 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
785#endif
786 (__force unsigned long)(a->s6_addr32[2] ^
787 cpu_to_be32(0x0000ffff))) == 0UL;
788}
789
790static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a)
791{
792 return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]);
793}
794
795static inline u32 ipv6_portaddr_hash(const struct net *net,
796 const struct in6_addr *addr6,
797 unsigned int port)
798{
799 unsigned int hash, mix = net_hash_mix(net);
800
801 if (ipv6_addr_any(addr6))
802 hash = jhash_1word(0, mix);
803 else if (ipv6_addr_v4mapped(addr6))
804 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
805 else
806 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
807
808 return hash ^ port;
809}
810
811/*
812 * Check for a RFC 4843 ORCHID address
813 * (Overlay Routable Cryptographic Hash Identifiers)
814 */
815static inline bool ipv6_addr_orchid(const struct in6_addr *a)
816{
817 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
818}
819
820static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
821{
822 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
823}
824
825static inline void ipv6_addr_set_v4mapped(const __be32 addr,
826 struct in6_addr *v4mapped)
827{
828 ipv6_addr_set(v4mapped,
829 0, 0,
830 htonl(0x0000FFFF),
831 addr);
832}
833
834/*
835 * find the first different bit between two addresses
836 * length of address must be a multiple of 32bits
837 */
838static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
839{
840 const __be32 *a1 = token1, *a2 = token2;
841 int i;
842
843 addrlen >>= 2;
844
845 for (i = 0; i < addrlen; i++) {
846 __be32 xb = a1[i] ^ a2[i];
847 if (xb)
848 return i * 32 + 31 - __fls(ntohl(xb));
849 }
850
851 /*
852 * we should *never* get to this point since that
853 * would mean the addrs are equal
854 *
855 * However, we do get to it 8) And exacly, when
856 * addresses are equal 8)
857 *
858 * ip route add 1111::/128 via ...
859 * ip route add 1111::/64 via ...
860 * and we are here.
861 *
862 * Ideally, this function should stop comparison
863 * at prefix length. It does not, but it is still OK,
864 * if returned value is greater than prefix length.
865 * --ANK (980803)
866 */
867 return addrlen << 5;
868}
869
870#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
871static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
872{
873 const __be64 *a1 = token1, *a2 = token2;
874 int i;
875
876 addrlen >>= 3;
877
878 for (i = 0; i < addrlen; i++) {
879 __be64 xb = a1[i] ^ a2[i];
880 if (xb)
881 return i * 64 + 63 - __fls(be64_to_cpu(xb));
882 }
883
884 return addrlen << 6;
885}
886#endif
887
888static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
889{
890#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
891 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
892 return __ipv6_addr_diff64(token1, token2, addrlen);
893#endif
894 return __ipv6_addr_diff32(token1, token2, addrlen);
895}
896
897static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
898{
899 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
900}
901
902__be32 ipv6_select_ident(struct net *net,
903 const struct in6_addr *daddr,
904 const struct in6_addr *saddr);
905__be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
906
907int ip6_dst_hoplimit(struct dst_entry *dst);
908
909static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
910 struct dst_entry *dst)
911{
912 int hlimit;
913
914 if (ipv6_addr_is_multicast(&fl6->daddr))
915 hlimit = np->mcast_hops;
916 else
917 hlimit = np->hop_limit;
918 if (hlimit < 0)
919 hlimit = ip6_dst_hoplimit(dst);
920 return hlimit;
921}
922
923/* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
924 * Equivalent to : flow->v6addrs.src = iph->saddr;
925 * flow->v6addrs.dst = iph->daddr;
926 */
927static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
928 const struct ipv6hdr *iph)
929{
930 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
931 offsetof(typeof(flow->addrs), v6addrs.src) +
932 sizeof(flow->addrs.v6addrs.src));
933 memcpy(&flow->addrs.v6addrs, &iph->addrs, sizeof(flow->addrs.v6addrs));
934 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
935}
936
937#if IS_ENABLED(CONFIG_IPV6)
938
939static inline bool ipv6_can_nonlocal_bind(struct net *net,
940 struct inet_sock *inet)
941{
942 return net->ipv6.sysctl.ip_nonlocal_bind ||
943 inet->freebind || inet->transparent;
944}
945
946/* Sysctl settings for net ipv6.auto_flowlabels */
947#define IP6_AUTO_FLOW_LABEL_OFF 0
948#define IP6_AUTO_FLOW_LABEL_OPTOUT 1
949#define IP6_AUTO_FLOW_LABEL_OPTIN 2
950#define IP6_AUTO_FLOW_LABEL_FORCED 3
951
952#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
953
954#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
955
956static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
957 __be32 flowlabel, bool autolabel,
958 struct flowi6 *fl6)
959{
960 u32 hash;
961
962 /* @flowlabel may include more than a flow label, eg, the traffic class.
963 * Here we want only the flow label value.
964 */
965 flowlabel &= IPV6_FLOWLABEL_MASK;
966
967 if (flowlabel ||
968 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
969 (!autolabel &&
970 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
971 return flowlabel;
972
973 hash = skb_get_hash_flowi6(skb, fl6);
974
975 /* Since this is being sent on the wire obfuscate hash a bit
976 * to minimize possbility that any useful information to an
977 * attacker is leaked. Only lower 20 bits are relevant.
978 */
979 hash = rol32(hash, 16);
980
981 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
982
983 if (net->ipv6.sysctl.flowlabel_state_ranges)
984 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
985
986 return flowlabel;
987}
988
989static inline int ip6_default_np_autolabel(struct net *net)
990{
991 switch (net->ipv6.sysctl.auto_flowlabels) {
992 case IP6_AUTO_FLOW_LABEL_OFF:
993 case IP6_AUTO_FLOW_LABEL_OPTIN:
994 default:
995 return 0;
996 case IP6_AUTO_FLOW_LABEL_OPTOUT:
997 case IP6_AUTO_FLOW_LABEL_FORCED:
998 return 1;
999 }
1000}
1001#else
1002static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
1003 __be32 flowlabel, bool autolabel,
1004 struct flowi6 *fl6)
1005{
1006 return flowlabel;
1007}
1008static inline int ip6_default_np_autolabel(struct net *net)
1009{
1010 return 0;
1011}
1012#endif
1013
1014#if IS_ENABLED(CONFIG_IPV6)
1015static inline int ip6_multipath_hash_policy(const struct net *net)
1016{
1017 return net->ipv6.sysctl.multipath_hash_policy;
1018}
1019static inline u32 ip6_multipath_hash_fields(const struct net *net)
1020{
1021 return net->ipv6.sysctl.multipath_hash_fields;
1022}
1023#else
1024static inline int ip6_multipath_hash_policy(const struct net *net)
1025{
1026 return 0;
1027}
1028static inline u32 ip6_multipath_hash_fields(const struct net *net)
1029{
1030 return 0;
1031}
1032#endif
1033
1034/*
1035 * Header manipulation
1036 */
1037static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
1038 __be32 flowlabel)
1039{
1040 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
1041}
1042
1043static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
1044{
1045 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
1046}
1047
1048static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
1049{
1050 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
1051}
1052
1053static inline u8 ip6_tclass(__be32 flowinfo)
1054{
1055 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
1056}
1057
1058static inline dscp_t ip6_dscp(__be32 flowinfo)
1059{
1060 return inet_dsfield_to_dscp(ip6_tclass(flowinfo));
1061}
1062
1063static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
1064{
1065 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
1066}
1067
1068static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6)
1069{
1070 return fl6->flowlabel & IPV6_FLOWLABEL_MASK;
1071}
1072
1073/*
1074 * Prototypes exported by ipv6
1075 */
1076
1077/*
1078 * rcv function (called from netdevice level)
1079 */
1080
1081int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
1082 struct packet_type *pt, struct net_device *orig_dev);
1083void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
1084 struct net_device *orig_dev);
1085
1086int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
1087
1088/*
1089 * upper-layer output functions
1090 */
1091int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
1092 __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority);
1093
1094int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
1095
1096int ip6_append_data(struct sock *sk,
1097 int getfrag(void *from, char *to, int offset, int len,
1098 int odd, struct sk_buff *skb),
1099 void *from, size_t length, int transhdrlen,
1100 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
1101 struct rt6_info *rt, unsigned int flags);
1102
1103int ip6_push_pending_frames(struct sock *sk);
1104
1105void ip6_flush_pending_frames(struct sock *sk);
1106
1107int ip6_send_skb(struct sk_buff *skb);
1108
1109struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
1110 struct inet_cork_full *cork,
1111 struct inet6_cork *v6_cork);
1112struct sk_buff *ip6_make_skb(struct sock *sk,
1113 int getfrag(void *from, char *to, int offset,
1114 int len, int odd, struct sk_buff *skb),
1115 void *from, size_t length, int transhdrlen,
1116 struct ipcm6_cookie *ipc6,
1117 struct rt6_info *rt, unsigned int flags,
1118 struct inet_cork_full *cork);
1119
1120static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
1121{
1122 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
1123 &inet6_sk(sk)->cork);
1124}
1125
1126int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
1127 struct flowi6 *fl6);
1128struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6,
1129 const struct in6_addr *final_dst);
1130struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
1131 const struct in6_addr *final_dst,
1132 bool connected);
1133struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb,
1134 struct net_device *dev,
1135 struct net *net, struct socket *sock,
1136 struct in6_addr *saddr,
1137 const struct ip_tunnel_info *info,
1138 u8 protocol, bool use_cache);
1139struct dst_entry *ip6_blackhole_route(struct net *net,
1140 struct dst_entry *orig_dst);
1141
1142/*
1143 * skb processing functions
1144 */
1145
1146int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1147int ip6_forward(struct sk_buff *skb);
1148int ip6_input(struct sk_buff *skb);
1149int ip6_mc_input(struct sk_buff *skb);
1150void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
1151 bool have_final);
1152
1153int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1154int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1155
1156/*
1157 * Extension header (options) processing
1158 */
1159
1160void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1161 u8 *proto, struct in6_addr **daddr_p,
1162 struct in6_addr *saddr);
1163void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1164 u8 *proto);
1165
1166int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
1167 __be16 *frag_offp);
1168
1169bool ipv6_ext_hdr(u8 nexthdr);
1170
1171enum {
1172 IP6_FH_F_FRAG = (1 << 0),
1173 IP6_FH_F_AUTH = (1 << 1),
1174 IP6_FH_F_SKIP_RH = (1 << 2),
1175};
1176
1177/* find specified header and get offset to it */
1178int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
1179 unsigned short *fragoff, int *fragflg);
1180
1181int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
1182
1183struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
1184 const struct ipv6_txoptions *opt,
1185 struct in6_addr *orig);
1186
1187/*
1188 * socket options (ipv6_sockglue.c)
1189 */
1190DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount);
1191
1192int do_ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1193 unsigned int optlen);
1194int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1195 unsigned int optlen);
1196int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1197 sockptr_t optval, sockptr_t optlen);
1198int ipv6_getsockopt(struct sock *sk, int level, int optname,
1199 char __user *optval, int __user *optlen);
1200
1201int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
1202 int addr_len);
1203int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
1204int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
1205 int addr_len);
1206int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
1207void ip6_datagram_release_cb(struct sock *sk);
1208
1209int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
1210 int *addr_len);
1211int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
1212 int *addr_len);
1213void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1214 u32 info, u8 *payload);
1215void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
1216void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
1217
1218void inet6_cleanup_sock(struct sock *sk);
1219void inet6_sock_destruct(struct sock *sk);
1220int inet6_release(struct socket *sock);
1221int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
1222int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
1223 int peer);
1224int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1225int inet6_compat_ioctl(struct socket *sock, unsigned int cmd,
1226 unsigned long arg);
1227
1228int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1229 struct sock *sk);
1230int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size);
1231int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1232 int flags);
1233
1234/*
1235 * reassembly.c
1236 */
1237extern const struct proto_ops inet6_stream_ops;
1238extern const struct proto_ops inet6_dgram_ops;
1239extern const struct proto_ops inet6_sockraw_ops;
1240
1241struct group_source_req;
1242struct group_filter;
1243
1244int ip6_mc_source(int add, int omode, struct sock *sk,
1245 struct group_source_req *pgsr);
1246int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
1247 struct sockaddr_storage *list);
1248int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1249 sockptr_t optval, size_t ss_offset);
1250
1251#ifdef CONFIG_PROC_FS
1252int ac6_proc_init(struct net *net);
1253void ac6_proc_exit(struct net *net);
1254int raw6_proc_init(void);
1255void raw6_proc_exit(void);
1256int tcp6_proc_init(struct net *net);
1257void tcp6_proc_exit(struct net *net);
1258int udp6_proc_init(struct net *net);
1259void udp6_proc_exit(struct net *net);
1260int udplite6_proc_init(void);
1261void udplite6_proc_exit(void);
1262int ipv6_misc_proc_init(void);
1263void ipv6_misc_proc_exit(void);
1264int snmp6_register_dev(struct inet6_dev *idev);
1265int snmp6_unregister_dev(struct inet6_dev *idev);
1266
1267#else
1268static inline int ac6_proc_init(struct net *net) { return 0; }
1269static inline void ac6_proc_exit(struct net *net) { }
1270static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1271static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1272#endif
1273
1274#ifdef CONFIG_SYSCTL
1275struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1276struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1277int ipv6_sysctl_register(void);
1278void ipv6_sysctl_unregister(void);
1279#endif
1280
1281int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1282 const struct in6_addr *addr);
1283int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
1284 const struct in6_addr *addr, unsigned int mode);
1285int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1286 const struct in6_addr *addr);
1287
1288static inline int ip6_sock_set_v6only(struct sock *sk)
1289{
1290 if (inet_sk(sk)->inet_num)
1291 return -EINVAL;
1292 lock_sock(sk);
1293 sk->sk_ipv6only = true;
1294 release_sock(sk);
1295 return 0;
1296}
1297
1298static inline void ip6_sock_set_recverr(struct sock *sk)
1299{
1300 lock_sock(sk);
1301 inet6_sk(sk)->recverr = true;
1302 release_sock(sk);
1303}
1304
1305static inline int __ip6_sock_set_addr_preferences(struct sock *sk, int val)
1306{
1307 unsigned int pref = 0;
1308 unsigned int prefmask = ~0;
1309
1310 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
1311 switch (val & (IPV6_PREFER_SRC_PUBLIC |
1312 IPV6_PREFER_SRC_TMP |
1313 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
1314 case IPV6_PREFER_SRC_PUBLIC:
1315 pref |= IPV6_PREFER_SRC_PUBLIC;
1316 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1317 IPV6_PREFER_SRC_TMP);
1318 break;
1319 case IPV6_PREFER_SRC_TMP:
1320 pref |= IPV6_PREFER_SRC_TMP;
1321 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1322 IPV6_PREFER_SRC_TMP);
1323 break;
1324 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
1325 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1326 IPV6_PREFER_SRC_TMP);
1327 break;
1328 case 0:
1329 break;
1330 default:
1331 return -EINVAL;
1332 }
1333
1334 /* check HOME/COA conflicts */
1335 switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) {
1336 case IPV6_PREFER_SRC_HOME:
1337 prefmask &= ~IPV6_PREFER_SRC_COA;
1338 break;
1339 case IPV6_PREFER_SRC_COA:
1340 pref |= IPV6_PREFER_SRC_COA;
1341 break;
1342 case 0:
1343 break;
1344 default:
1345 return -EINVAL;
1346 }
1347
1348 /* check CGA/NONCGA conflicts */
1349 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
1350 case IPV6_PREFER_SRC_CGA:
1351 case IPV6_PREFER_SRC_NONCGA:
1352 case 0:
1353 break;
1354 default:
1355 return -EINVAL;
1356 }
1357
1358 inet6_sk(sk)->srcprefs = (inet6_sk(sk)->srcprefs & prefmask) | pref;
1359 return 0;
1360}
1361
1362static inline int ip6_sock_set_addr_preferences(struct sock *sk, bool val)
1363{
1364 int ret;
1365
1366 lock_sock(sk);
1367 ret = __ip6_sock_set_addr_preferences(sk, val);
1368 release_sock(sk);
1369 return ret;
1370}
1371
1372static inline void ip6_sock_set_recvpktinfo(struct sock *sk)
1373{
1374 lock_sock(sk);
1375 inet6_sk(sk)->rxopt.bits.rxinfo = true;
1376 release_sock(sk);
1377}
1378
1379#endif /* _NET_IPV6_H */
1/*
2 * Linux INET6 implementation
3 *
4 * Authors:
5 * Pedro Roque <roque@di.fc.ul.pt>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13#ifndef _NET_IPV6_H
14#define _NET_IPV6_H
15
16#include <linux/ipv6.h>
17#include <linux/hardirq.h>
18#include <linux/jhash.h>
19#include <net/if_inet6.h>
20#include <net/ndisc.h>
21#include <net/flow.h>
22#include <net/flow_dissector.h>
23#include <net/snmp.h>
24
25#define SIN6_LEN_RFC2133 24
26
27#define IPV6_MAXPLEN 65535
28
29/*
30 * NextHeader field of IPv6 header
31 */
32
33#define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
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/*
54 * Addr type
55 *
56 * type - unicast | multicast
57 * scope - local | site | global
58 * v4 - compat
59 * v4mapped
60 * any
61 * loopback
62 */
63
64#define IPV6_ADDR_ANY 0x0000U
65
66#define IPV6_ADDR_UNICAST 0x0001U
67#define IPV6_ADDR_MULTICAST 0x0002U
68
69#define IPV6_ADDR_LOOPBACK 0x0010U
70#define IPV6_ADDR_LINKLOCAL 0x0020U
71#define IPV6_ADDR_SITELOCAL 0x0040U
72
73#define IPV6_ADDR_COMPATv4 0x0080U
74
75#define IPV6_ADDR_SCOPE_MASK 0x00f0U
76
77#define IPV6_ADDR_MAPPED 0x1000U
78
79/*
80 * Addr scopes
81 */
82#define IPV6_ADDR_MC_SCOPE(a) \
83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
84#define __IPV6_ADDR_SCOPE_INVALID -1
85#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
86#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
87#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
88#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
89#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
90
91/*
92 * Addr flags
93 */
94#define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
95 ((a)->s6_addr[1] & 0x10)
96#define IPV6_ADDR_MC_FLAG_PREFIX(a) \
97 ((a)->s6_addr[1] & 0x20)
98#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
99 ((a)->s6_addr[1] & 0x40)
100
101/*
102 * fragmentation header
103 */
104
105struct frag_hdr {
106 __u8 nexthdr;
107 __u8 reserved;
108 __be16 frag_off;
109 __be32 identification;
110};
111
112#define IP6_MF 0x0001
113#define IP6_OFFSET 0xFFF8
114
115#define IP6_REPLY_MARK(net, mark) \
116 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
117
118#include <net/sock.h>
119
120/* sysctls */
121extern int sysctl_mld_max_msf;
122extern int sysctl_mld_qrv;
123
124#define _DEVINC(net, statname, modifier, idev, field) \
125({ \
126 struct inet6_dev *_idev = (idev); \
127 if (likely(_idev != NULL)) \
128 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
129 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
130})
131
132/* per device counters are atomic_long_t */
133#define _DEVINCATOMIC(net, statname, modifier, idev, field) \
134({ \
135 struct inet6_dev *_idev = (idev); \
136 if (likely(_idev != NULL)) \
137 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
138 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
139})
140
141/* per device and per net counters are atomic_long_t */
142#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
143({ \
144 struct inet6_dev *_idev = (idev); \
145 if (likely(_idev != NULL)) \
146 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
147 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
148})
149
150#define _DEVADD(net, statname, modifier, idev, field, val) \
151({ \
152 struct inet6_dev *_idev = (idev); \
153 if (likely(_idev != NULL)) \
154 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
155 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
156})
157
158#define _DEVUPD(net, statname, modifier, idev, field, val) \
159({ \
160 struct inet6_dev *_idev = (idev); \
161 if (likely(_idev != NULL)) \
162 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
163 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
164})
165
166/* MIBs */
167
168#define IP6_INC_STATS(net, idev,field) \
169 _DEVINC(net, ipv6, 64, idev, field)
170#define IP6_INC_STATS_BH(net, idev,field) \
171 _DEVINC(net, ipv6, 64_BH, idev, field)
172#define IP6_ADD_STATS(net, idev,field,val) \
173 _DEVADD(net, ipv6, 64, idev, field, val)
174#define IP6_ADD_STATS_BH(net, idev,field,val) \
175 _DEVADD(net, ipv6, 64_BH, idev, field, val)
176#define IP6_UPD_PO_STATS(net, idev,field,val) \
177 _DEVUPD(net, ipv6, 64, idev, field, val)
178#define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
179 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
180#define ICMP6_INC_STATS(net, idev, field) \
181 _DEVINCATOMIC(net, icmpv6, , idev, field)
182#define ICMP6_INC_STATS_BH(net, idev, field) \
183 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
184
185#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
187#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
188 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
189#define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
190 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
191
192struct ip6_ra_chain {
193 struct ip6_ra_chain *next;
194 struct sock *sk;
195 int sel;
196 void (*destructor)(struct sock *);
197};
198
199extern struct ip6_ra_chain *ip6_ra_chain;
200extern rwlock_t ip6_ra_lock;
201
202/*
203 This structure is prepared by protocol, when parsing
204 ancillary data and passed to IPv6.
205 */
206
207struct ipv6_txoptions {
208 atomic_t refcnt;
209 /* Length of this structure */
210 int tot_len;
211
212 /* length of extension headers */
213
214 __u16 opt_flen; /* after fragment hdr */
215 __u16 opt_nflen; /* before fragment hdr */
216
217 struct ipv6_opt_hdr *hopopt;
218 struct ipv6_opt_hdr *dst0opt;
219 struct ipv6_rt_hdr *srcrt; /* Routing Header */
220 struct ipv6_opt_hdr *dst1opt;
221 struct rcu_head rcu;
222 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
223};
224
225struct ip6_flowlabel {
226 struct ip6_flowlabel __rcu *next;
227 __be32 label;
228 atomic_t users;
229 struct in6_addr dst;
230 struct ipv6_txoptions *opt;
231 unsigned long linger;
232 struct rcu_head rcu;
233 u8 share;
234 union {
235 struct pid *pid;
236 kuid_t uid;
237 } owner;
238 unsigned long lastuse;
239 unsigned long expires;
240 struct net *fl_net;
241};
242
243#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
244#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
245#define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
246
247#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
248#define IPV6_TCLASS_SHIFT 20
249
250struct ipv6_fl_socklist {
251 struct ipv6_fl_socklist __rcu *next;
252 struct ip6_flowlabel *fl;
253 struct rcu_head rcu;
254};
255
256static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
257{
258 struct ipv6_txoptions *opt;
259
260 rcu_read_lock();
261 opt = rcu_dereference(np->opt);
262 if (opt) {
263 if (!atomic_inc_not_zero(&opt->refcnt))
264 opt = NULL;
265 else
266 opt = rcu_pointer_handoff(opt);
267 }
268 rcu_read_unlock();
269 return opt;
270}
271
272static inline void txopt_put(struct ipv6_txoptions *opt)
273{
274 if (opt && atomic_dec_and_test(&opt->refcnt))
275 kfree_rcu(opt, rcu);
276}
277
278struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
279struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
280 struct ip6_flowlabel *fl,
281 struct ipv6_txoptions *fopt);
282void fl6_free_socklist(struct sock *sk);
283int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
284int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
285 int flags);
286int ip6_flowlabel_init(void);
287void ip6_flowlabel_cleanup(void);
288
289static inline void fl6_sock_release(struct ip6_flowlabel *fl)
290{
291 if (fl)
292 atomic_dec(&fl->users);
293}
294
295void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
296
297int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
298 struct icmp6hdr *thdr, int len);
299
300int ip6_ra_control(struct sock *sk, int sel);
301
302int ipv6_parse_hopopts(struct sk_buff *skb);
303
304struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
305 struct ipv6_txoptions *opt);
306struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
307 struct ipv6_txoptions *opt,
308 int newtype,
309 struct ipv6_opt_hdr __user *newopt,
310 int newoptlen);
311struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
312 struct ipv6_txoptions *opt);
313
314bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
315 const struct inet6_skb_parm *opt);
316
317static inline bool ipv6_accept_ra(struct inet6_dev *idev)
318{
319 /* If forwarding is enabled, RA are not accepted unless the special
320 * hybrid mode (accept_ra=2) is enabled.
321 */
322 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
323 idev->cnf.accept_ra;
324}
325
326#if IS_ENABLED(CONFIG_IPV6)
327static inline int ip6_frag_mem(struct net *net)
328{
329 return sum_frag_mem_limit(&net->ipv6.frags);
330}
331#endif
332
333#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
334#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
335#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
336
337int __ipv6_addr_type(const struct in6_addr *addr);
338static inline int ipv6_addr_type(const struct in6_addr *addr)
339{
340 return __ipv6_addr_type(addr) & 0xffff;
341}
342
343static inline int ipv6_addr_scope(const struct in6_addr *addr)
344{
345 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
346}
347
348static inline int __ipv6_addr_src_scope(int type)
349{
350 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
351}
352
353static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
354{
355 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
356}
357
358static inline bool __ipv6_addr_needs_scope_id(int type)
359{
360 return type & IPV6_ADDR_LINKLOCAL ||
361 (type & IPV6_ADDR_MULTICAST &&
362 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
363}
364
365static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
366{
367 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
368}
369
370static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
371{
372 return memcmp(a1, a2, sizeof(struct in6_addr));
373}
374
375static inline bool
376ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
377 const struct in6_addr *a2)
378{
379#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
380 const unsigned long *ul1 = (const unsigned long *)a1;
381 const unsigned long *ulm = (const unsigned long *)m;
382 const unsigned long *ul2 = (const unsigned long *)a2;
383
384 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
385 ((ul1[1] ^ ul2[1]) & ulm[1]));
386#else
387 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
388 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
389 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
390 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
391#endif
392}
393
394static inline void ipv6_addr_prefix(struct in6_addr *pfx,
395 const struct in6_addr *addr,
396 int plen)
397{
398 /* caller must guarantee 0 <= plen <= 128 */
399 int o = plen >> 3,
400 b = plen & 0x7;
401
402 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
403 memcpy(pfx->s6_addr, addr, o);
404 if (b != 0)
405 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
406}
407
408static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
409 const struct in6_addr *pfx,
410 int plen)
411{
412 /* caller must guarantee 0 <= plen <= 128 */
413 int o = plen >> 3,
414 b = plen & 0x7;
415
416 memcpy(addr->s6_addr, pfx, o);
417 if (b != 0) {
418 addr->s6_addr[o] &= ~(0xff00 >> b);
419 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
420 }
421}
422
423static inline void __ipv6_addr_set_half(__be32 *addr,
424 __be32 wh, __be32 wl)
425{
426#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
427#if defined(__BIG_ENDIAN)
428 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
429 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
430 return;
431 }
432#elif defined(__LITTLE_ENDIAN)
433 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
434 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
435 return;
436 }
437#endif
438#endif
439 addr[0] = wh;
440 addr[1] = wl;
441}
442
443static inline void ipv6_addr_set(struct in6_addr *addr,
444 __be32 w1, __be32 w2,
445 __be32 w3, __be32 w4)
446{
447 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
448 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
449}
450
451static inline bool ipv6_addr_equal(const struct in6_addr *a1,
452 const struct in6_addr *a2)
453{
454#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
455 const unsigned long *ul1 = (const unsigned long *)a1;
456 const unsigned long *ul2 = (const unsigned long *)a2;
457
458 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
459#else
460 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
461 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
462 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
463 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
464#endif
465}
466
467#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
468static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
469 const __be64 *a2,
470 unsigned int len)
471{
472 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
473 return false;
474 return true;
475}
476
477static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
478 const struct in6_addr *addr2,
479 unsigned int prefixlen)
480{
481 const __be64 *a1 = (const __be64 *)addr1;
482 const __be64 *a2 = (const __be64 *)addr2;
483
484 if (prefixlen >= 64) {
485 if (a1[0] ^ a2[0])
486 return false;
487 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
488 }
489 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
490}
491#else
492static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
493 const struct in6_addr *addr2,
494 unsigned int prefixlen)
495{
496 const __be32 *a1 = addr1->s6_addr32;
497 const __be32 *a2 = addr2->s6_addr32;
498 unsigned int pdw, pbi;
499
500 /* check complete u32 in prefix */
501 pdw = prefixlen >> 5;
502 if (pdw && memcmp(a1, a2, pdw << 2))
503 return false;
504
505 /* check incomplete u32 in prefix */
506 pbi = prefixlen & 0x1f;
507 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
508 return false;
509
510 return true;
511}
512#endif
513
514struct inet_frag_queue;
515
516enum ip6_defrag_users {
517 IP6_DEFRAG_LOCAL_DELIVER,
518 IP6_DEFRAG_CONNTRACK_IN,
519 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
520 IP6_DEFRAG_CONNTRACK_OUT,
521 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
522 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
523 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
524};
525
526struct ip6_create_arg {
527 __be32 id;
528 u32 user;
529 const struct in6_addr *src;
530 const struct in6_addr *dst;
531 int iif;
532 u8 ecn;
533};
534
535void ip6_frag_init(struct inet_frag_queue *q, const void *a);
536bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
537
538/*
539 * Equivalent of ipv4 struct ip
540 */
541struct frag_queue {
542 struct inet_frag_queue q;
543
544 __be32 id; /* fragment id */
545 u32 user;
546 struct in6_addr saddr;
547 struct in6_addr daddr;
548
549 int iif;
550 unsigned int csum;
551 __u16 nhoffset;
552 u8 ecn;
553};
554
555void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
556 struct inet_frags *frags);
557
558static inline bool ipv6_addr_any(const struct in6_addr *a)
559{
560#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
561 const unsigned long *ul = (const unsigned long *)a;
562
563 return (ul[0] | ul[1]) == 0UL;
564#else
565 return (a->s6_addr32[0] | a->s6_addr32[1] |
566 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
567#endif
568}
569
570static inline u32 ipv6_addr_hash(const struct in6_addr *a)
571{
572#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
573 const unsigned long *ul = (const unsigned long *)a;
574 unsigned long x = ul[0] ^ ul[1];
575
576 return (u32)(x ^ (x >> 32));
577#else
578 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
579 a->s6_addr32[2] ^ a->s6_addr32[3]);
580#endif
581}
582
583/* more secured version of ipv6_addr_hash() */
584static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
585{
586 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
587
588 return jhash_3words(v,
589 (__force u32)a->s6_addr32[2],
590 (__force u32)a->s6_addr32[3],
591 initval);
592}
593
594static inline bool ipv6_addr_loopback(const struct in6_addr *a)
595{
596#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
597 const __be64 *be = (const __be64 *)a;
598
599 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
600#else
601 return (a->s6_addr32[0] | a->s6_addr32[1] |
602 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
603#endif
604}
605
606/*
607 * Note that we must __force cast these to unsigned long to make sparse happy,
608 * since all of the endian-annotated types are fixed size regardless of arch.
609 */
610static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
611{
612 return (
613#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
614 *(unsigned long *)a |
615#else
616 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
617#endif
618 (__force unsigned long)(a->s6_addr32[2] ^
619 cpu_to_be32(0x0000ffff))) == 0UL;
620}
621
622/*
623 * Check for a RFC 4843 ORCHID address
624 * (Overlay Routable Cryptographic Hash Identifiers)
625 */
626static inline bool ipv6_addr_orchid(const struct in6_addr *a)
627{
628 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
629}
630
631static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
632{
633 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
634}
635
636static inline void ipv6_addr_set_v4mapped(const __be32 addr,
637 struct in6_addr *v4mapped)
638{
639 ipv6_addr_set(v4mapped,
640 0, 0,
641 htonl(0x0000FFFF),
642 addr);
643}
644
645/*
646 * find the first different bit between two addresses
647 * length of address must be a multiple of 32bits
648 */
649static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
650{
651 const __be32 *a1 = token1, *a2 = token2;
652 int i;
653
654 addrlen >>= 2;
655
656 for (i = 0; i < addrlen; i++) {
657 __be32 xb = a1[i] ^ a2[i];
658 if (xb)
659 return i * 32 + 31 - __fls(ntohl(xb));
660 }
661
662 /*
663 * we should *never* get to this point since that
664 * would mean the addrs are equal
665 *
666 * However, we do get to it 8) And exacly, when
667 * addresses are equal 8)
668 *
669 * ip route add 1111::/128 via ...
670 * ip route add 1111::/64 via ...
671 * and we are here.
672 *
673 * Ideally, this function should stop comparison
674 * at prefix length. It does not, but it is still OK,
675 * if returned value is greater than prefix length.
676 * --ANK (980803)
677 */
678 return addrlen << 5;
679}
680
681#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
682static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
683{
684 const __be64 *a1 = token1, *a2 = token2;
685 int i;
686
687 addrlen >>= 3;
688
689 for (i = 0; i < addrlen; i++) {
690 __be64 xb = a1[i] ^ a2[i];
691 if (xb)
692 return i * 64 + 63 - __fls(be64_to_cpu(xb));
693 }
694
695 return addrlen << 6;
696}
697#endif
698
699static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
700{
701#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
702 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
703 return __ipv6_addr_diff64(token1, token2, addrlen);
704#endif
705 return __ipv6_addr_diff32(token1, token2, addrlen);
706}
707
708static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
709{
710 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
711}
712
713__be32 ipv6_select_ident(struct net *net,
714 const struct in6_addr *daddr,
715 const struct in6_addr *saddr);
716void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
717
718int ip6_dst_hoplimit(struct dst_entry *dst);
719
720static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
721 struct dst_entry *dst)
722{
723 int hlimit;
724
725 if (ipv6_addr_is_multicast(&fl6->daddr))
726 hlimit = np->mcast_hops;
727 else
728 hlimit = np->hop_limit;
729 if (hlimit < 0)
730 hlimit = ip6_dst_hoplimit(dst);
731 return hlimit;
732}
733
734/* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
735 * Equivalent to : flow->v6addrs.src = iph->saddr;
736 * flow->v6addrs.dst = iph->daddr;
737 */
738static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
739 const struct ipv6hdr *iph)
740{
741 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
742 offsetof(typeof(flow->addrs), v6addrs.src) +
743 sizeof(flow->addrs.v6addrs.src));
744 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
745 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
746}
747
748#if IS_ENABLED(CONFIG_IPV6)
749
750/* Sysctl settings for net ipv6.auto_flowlabels */
751#define IP6_AUTO_FLOW_LABEL_OFF 0
752#define IP6_AUTO_FLOW_LABEL_OPTOUT 1
753#define IP6_AUTO_FLOW_LABEL_OPTIN 2
754#define IP6_AUTO_FLOW_LABEL_FORCED 3
755
756#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
757
758#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
759
760static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
761 __be32 flowlabel, bool autolabel,
762 struct flowi6 *fl6)
763{
764 u32 hash;
765
766 if (flowlabel ||
767 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
768 (!autolabel &&
769 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
770 return flowlabel;
771
772 hash = skb_get_hash_flowi6(skb, fl6);
773
774 /* Since this is being sent on the wire obfuscate hash a bit
775 * to minimize possbility that any useful information to an
776 * attacker is leaked. Only lower 20 bits are relevant.
777 */
778 rol32(hash, 16);
779
780 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
781
782 if (net->ipv6.sysctl.flowlabel_state_ranges)
783 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
784
785 return flowlabel;
786}
787
788static inline int ip6_default_np_autolabel(struct net *net)
789{
790 switch (net->ipv6.sysctl.auto_flowlabels) {
791 case IP6_AUTO_FLOW_LABEL_OFF:
792 case IP6_AUTO_FLOW_LABEL_OPTIN:
793 default:
794 return 0;
795 case IP6_AUTO_FLOW_LABEL_OPTOUT:
796 case IP6_AUTO_FLOW_LABEL_FORCED:
797 return 1;
798 }
799}
800#else
801static inline void ip6_set_txhash(struct sock *sk) { }
802static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
803 __be32 flowlabel, bool autolabel,
804 struct flowi6 *fl6)
805{
806 return flowlabel;
807}
808static inline int ip6_default_np_autolabel(struct net *net)
809{
810 return 0;
811}
812#endif
813
814
815/*
816 * Header manipulation
817 */
818static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
819 __be32 flowlabel)
820{
821 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
822}
823
824static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
825{
826 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
827}
828
829static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
830{
831 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
832}
833
834static inline u8 ip6_tclass(__be32 flowinfo)
835{
836 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
837}
838
839static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
840{
841 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
842}
843
844/*
845 * Prototypes exported by ipv6
846 */
847
848/*
849 * rcv function (called from netdevice level)
850 */
851
852int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
853 struct packet_type *pt, struct net_device *orig_dev);
854
855int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
856
857/*
858 * upper-layer output functions
859 */
860int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
861 struct ipv6_txoptions *opt, int tclass);
862
863int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
864
865int ip6_append_data(struct sock *sk,
866 int getfrag(void *from, char *to, int offset, int len,
867 int odd, struct sk_buff *skb),
868 void *from, int length, int transhdrlen, int hlimit,
869 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
870 struct rt6_info *rt, unsigned int flags, int dontfrag);
871
872int ip6_push_pending_frames(struct sock *sk);
873
874void ip6_flush_pending_frames(struct sock *sk);
875
876int ip6_send_skb(struct sk_buff *skb);
877
878struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
879 struct inet_cork_full *cork,
880 struct inet6_cork *v6_cork);
881struct sk_buff *ip6_make_skb(struct sock *sk,
882 int getfrag(void *from, char *to, int offset,
883 int len, int odd, struct sk_buff *skb),
884 void *from, int length, int transhdrlen,
885 int hlimit, int tclass, struct ipv6_txoptions *opt,
886 struct flowi6 *fl6, struct rt6_info *rt,
887 unsigned int flags, int dontfrag);
888
889static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
890{
891 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
892 &inet6_sk(sk)->cork);
893}
894
895int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
896 struct flowi6 *fl6);
897struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
898 const struct in6_addr *final_dst);
899struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
900 const struct in6_addr *final_dst);
901struct dst_entry *ip6_blackhole_route(struct net *net,
902 struct dst_entry *orig_dst);
903
904/*
905 * skb processing functions
906 */
907
908int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
909int ip6_forward(struct sk_buff *skb);
910int ip6_input(struct sk_buff *skb);
911int ip6_mc_input(struct sk_buff *skb);
912
913int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
914int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
915
916/*
917 * Extension header (options) processing
918 */
919
920void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
921 u8 *proto, struct in6_addr **daddr_p);
922void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
923 u8 *proto);
924
925int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
926 __be16 *frag_offp);
927
928bool ipv6_ext_hdr(u8 nexthdr);
929
930enum {
931 IP6_FH_F_FRAG = (1 << 0),
932 IP6_FH_F_AUTH = (1 << 1),
933 IP6_FH_F_SKIP_RH = (1 << 2),
934};
935
936/* find specified header and get offset to it */
937int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
938 unsigned short *fragoff, int *fragflg);
939
940int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
941
942struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
943 const struct ipv6_txoptions *opt,
944 struct in6_addr *orig);
945
946/*
947 * socket options (ipv6_sockglue.c)
948 */
949
950int ipv6_setsockopt(struct sock *sk, int level, int optname,
951 char __user *optval, unsigned int optlen);
952int ipv6_getsockopt(struct sock *sk, int level, int optname,
953 char __user *optval, int __user *optlen);
954int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
955 char __user *optval, unsigned int optlen);
956int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
957 char __user *optval, int __user *optlen);
958
959int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
960int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
961 int addr_len);
962int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
963void ip6_datagram_release_cb(struct sock *sk);
964
965int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
966 int *addr_len);
967int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
968 int *addr_len);
969void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
970 u32 info, u8 *payload);
971void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
972void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
973
974int inet6_release(struct socket *sock);
975int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
976int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
977 int peer);
978int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
979
980int inet6_hash_connect(struct inet_timewait_death_row *death_row,
981 struct sock *sk);
982
983/*
984 * reassembly.c
985 */
986extern const struct proto_ops inet6_stream_ops;
987extern const struct proto_ops inet6_dgram_ops;
988
989struct group_source_req;
990struct group_filter;
991
992int ip6_mc_source(int add, int omode, struct sock *sk,
993 struct group_source_req *pgsr);
994int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
995int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
996 struct group_filter __user *optval, int __user *optlen);
997
998#ifdef CONFIG_PROC_FS
999int ac6_proc_init(struct net *net);
1000void ac6_proc_exit(struct net *net);
1001int raw6_proc_init(void);
1002void raw6_proc_exit(void);
1003int tcp6_proc_init(struct net *net);
1004void tcp6_proc_exit(struct net *net);
1005int udp6_proc_init(struct net *net);
1006void udp6_proc_exit(struct net *net);
1007int udplite6_proc_init(void);
1008void udplite6_proc_exit(void);
1009int ipv6_misc_proc_init(void);
1010void ipv6_misc_proc_exit(void);
1011int snmp6_register_dev(struct inet6_dev *idev);
1012int snmp6_unregister_dev(struct inet6_dev *idev);
1013
1014#else
1015static inline int ac6_proc_init(struct net *net) { return 0; }
1016static inline void ac6_proc_exit(struct net *net) { }
1017static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1018static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1019#endif
1020
1021#ifdef CONFIG_SYSCTL
1022extern struct ctl_table ipv6_route_table_template[];
1023
1024struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1025struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1026int ipv6_sysctl_register(void);
1027void ipv6_sysctl_unregister(void);
1028#endif
1029
1030int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1031 const struct in6_addr *addr);
1032int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1033 const struct in6_addr *addr);
1034#endif /* _NET_IPV6_H */