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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 <net/if_inet6.h>
19#include <net/ndisc.h>
20#include <net/flow.h>
21#include <net/snmp.h>
22
23#define SIN6_LEN_RFC2133 24
24
25#define IPV6_MAXPLEN 65535
26
27/*
28 * NextHeader field of IPv6 header
29 */
30
31#define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
32#define NEXTHDR_TCP 6 /* TCP segment. */
33#define NEXTHDR_UDP 17 /* UDP message. */
34#define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
35#define NEXTHDR_ROUTING 43 /* Routing header. */
36#define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
37#define NEXTHDR_ESP 50 /* Encapsulating security payload. */
38#define NEXTHDR_AUTH 51 /* Authentication header. */
39#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
40#define NEXTHDR_NONE 59 /* No next header */
41#define NEXTHDR_DEST 60 /* Destination options header. */
42#define NEXTHDR_MOBILITY 135 /* Mobility header. */
43
44#define NEXTHDR_MAX 255
45
46
47
48#define IPV6_DEFAULT_HOPLIMIT 64
49#define IPV6_DEFAULT_MCASTHOPS 1
50
51/*
52 * Addr type
53 *
54 * type - unicast | multicast
55 * scope - local | site | global
56 * v4 - compat
57 * v4mapped
58 * any
59 * loopback
60 */
61
62#define IPV6_ADDR_ANY 0x0000U
63
64#define IPV6_ADDR_UNICAST 0x0001U
65#define IPV6_ADDR_MULTICAST 0x0002U
66
67#define IPV6_ADDR_LOOPBACK 0x0010U
68#define IPV6_ADDR_LINKLOCAL 0x0020U
69#define IPV6_ADDR_SITELOCAL 0x0040U
70
71#define IPV6_ADDR_COMPATv4 0x0080U
72
73#define IPV6_ADDR_SCOPE_MASK 0x00f0U
74
75#define IPV6_ADDR_MAPPED 0x1000U
76
77/*
78 * Addr scopes
79 */
80#define IPV6_ADDR_MC_SCOPE(a) \
81 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
82#define __IPV6_ADDR_SCOPE_INVALID -1
83#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
84#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
85#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
86#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
87#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
88
89/*
90 * Addr flags
91 */
92#define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
93 ((a)->s6_addr[1] & 0x10)
94#define IPV6_ADDR_MC_FLAG_PREFIX(a) \
95 ((a)->s6_addr[1] & 0x20)
96#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
97 ((a)->s6_addr[1] & 0x40)
98
99/*
100 * fragmentation header
101 */
102
103struct frag_hdr {
104 __u8 nexthdr;
105 __u8 reserved;
106 __be16 frag_off;
107 __be32 identification;
108};
109
110#define IP6_MF 0x0001
111
112#include <net/sock.h>
113
114/* sysctls */
115extern int sysctl_mld_max_msf;
116extern struct ctl_path net_ipv6_ctl_path[];
117
118#define _DEVINC(net, statname, modifier, idev, field) \
119({ \
120 struct inet6_dev *_idev = (idev); \
121 if (likely(_idev != NULL)) \
122 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
123 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
124})
125
126/* per device counters are atomic_long_t */
127#define _DEVINCATOMIC(net, statname, modifier, idev, field) \
128({ \
129 struct inet6_dev *_idev = (idev); \
130 if (likely(_idev != NULL)) \
131 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
132 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
133})
134
135#define _DEVADD(net, statname, modifier, idev, field, val) \
136({ \
137 struct inet6_dev *_idev = (idev); \
138 if (likely(_idev != NULL)) \
139 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
140 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
141})
142
143#define _DEVUPD(net, statname, modifier, idev, field, val) \
144({ \
145 struct inet6_dev *_idev = (idev); \
146 if (likely(_idev != NULL)) \
147 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
148 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
149})
150
151/* MIBs */
152
153#define IP6_INC_STATS(net, idev,field) \
154 _DEVINC(net, ipv6, 64, idev, field)
155#define IP6_INC_STATS_BH(net, idev,field) \
156 _DEVINC(net, ipv6, 64_BH, idev, field)
157#define IP6_ADD_STATS(net, idev,field,val) \
158 _DEVADD(net, ipv6, 64, idev, field, val)
159#define IP6_ADD_STATS_BH(net, idev,field,val) \
160 _DEVADD(net, ipv6, 64_BH, idev, field, val)
161#define IP6_UPD_PO_STATS(net, idev,field,val) \
162 _DEVUPD(net, ipv6, 64, idev, field, val)
163#define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
164 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
165#define ICMP6_INC_STATS(net, idev, field) \
166 _DEVINCATOMIC(net, icmpv6, , idev, field)
167#define ICMP6_INC_STATS_BH(net, idev, field) \
168 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
169
170#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
171 _DEVINCATOMIC(net, icmpv6msg, , idev, field +256)
172#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
173 _DEVINCATOMIC(net, icmpv6msg, _BH, idev, field +256)
174#define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
175 _DEVINCATOMIC(net, icmpv6msg, _BH, idev, field)
176
177struct ip6_ra_chain {
178 struct ip6_ra_chain *next;
179 struct sock *sk;
180 int sel;
181 void (*destructor)(struct sock *);
182};
183
184extern struct ip6_ra_chain *ip6_ra_chain;
185extern rwlock_t ip6_ra_lock;
186
187/*
188 This structure is prepared by protocol, when parsing
189 ancillary data and passed to IPv6.
190 */
191
192struct ipv6_txoptions {
193 /* Length of this structure */
194 int tot_len;
195
196 /* length of extension headers */
197
198 __u16 opt_flen; /* after fragment hdr */
199 __u16 opt_nflen; /* before fragment hdr */
200
201 struct ipv6_opt_hdr *hopopt;
202 struct ipv6_opt_hdr *dst0opt;
203 struct ipv6_rt_hdr *srcrt; /* Routing Header */
204 struct ipv6_opt_hdr *dst1opt;
205
206 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
207};
208
209struct ip6_flowlabel {
210 struct ip6_flowlabel *next;
211 __be32 label;
212 atomic_t users;
213 struct in6_addr dst;
214 struct ipv6_txoptions *opt;
215 unsigned long linger;
216 u8 share;
217 u32 owner;
218 unsigned long lastuse;
219 unsigned long expires;
220 struct net *fl_net;
221};
222
223#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
224#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
225
226struct ipv6_fl_socklist {
227 struct ipv6_fl_socklist *next;
228 struct ip6_flowlabel *fl;
229};
230
231extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
232extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
233 struct ip6_flowlabel * fl,
234 struct ipv6_txoptions * fopt);
235extern void fl6_free_socklist(struct sock *sk);
236extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
237extern int ip6_flowlabel_init(void);
238extern void ip6_flowlabel_cleanup(void);
239
240static inline void fl6_sock_release(struct ip6_flowlabel *fl)
241{
242 if (fl)
243 atomic_dec(&fl->users);
244}
245
246extern int ip6_ra_control(struct sock *sk, int sel);
247
248extern int ipv6_parse_hopopts(struct sk_buff *skb);
249
250extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
251extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
252 int newtype,
253 struct ipv6_opt_hdr __user *newopt,
254 int newoptlen);
255struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
256 struct ipv6_txoptions *opt);
257
258extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
259
260int ip6_frag_nqueues(struct net *net);
261int ip6_frag_mem(struct net *net);
262
263#define IPV6_FRAG_HIGH_THRESH (256 * 1024) /* 262144 */
264#define IPV6_FRAG_LOW_THRESH (192 * 1024) /* 196608 */
265#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
266
267extern int __ipv6_addr_type(const struct in6_addr *addr);
268static inline int ipv6_addr_type(const struct in6_addr *addr)
269{
270 return __ipv6_addr_type(addr) & 0xffff;
271}
272
273static inline int ipv6_addr_scope(const struct in6_addr *addr)
274{
275 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
276}
277
278static inline int __ipv6_addr_src_scope(int type)
279{
280 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
281}
282
283static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
284{
285 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
286}
287
288static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
289{
290 return memcmp(a1, a2, sizeof(struct in6_addr));
291}
292
293static inline int
294ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
295 const struct in6_addr *a2)
296{
297 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
298 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
299 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
300 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
301}
302
303static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
304{
305 memcpy(a1, a2, sizeof(struct in6_addr));
306}
307
308static inline void ipv6_addr_prefix(struct in6_addr *pfx,
309 const struct in6_addr *addr,
310 int plen)
311{
312 /* caller must guarantee 0 <= plen <= 128 */
313 int o = plen >> 3,
314 b = plen & 0x7;
315
316 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
317 memcpy(pfx->s6_addr, addr, o);
318 if (b != 0)
319 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
320}
321
322static inline void ipv6_addr_set(struct in6_addr *addr,
323 __be32 w1, __be32 w2,
324 __be32 w3, __be32 w4)
325{
326 addr->s6_addr32[0] = w1;
327 addr->s6_addr32[1] = w2;
328 addr->s6_addr32[2] = w3;
329 addr->s6_addr32[3] = w4;
330}
331
332static inline int ipv6_addr_equal(const struct in6_addr *a1,
333 const struct in6_addr *a2)
334{
335 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
336 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
337 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
338 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
339}
340
341static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
342 unsigned int prefixlen)
343{
344 unsigned pdw, pbi;
345
346 /* check complete u32 in prefix */
347 pdw = prefixlen >> 5;
348 if (pdw && memcmp(a1, a2, pdw << 2))
349 return 0;
350
351 /* check incomplete u32 in prefix */
352 pbi = prefixlen & 0x1f;
353 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
354 return 0;
355
356 return 1;
357}
358
359static inline int ipv6_prefix_equal(const struct in6_addr *a1,
360 const struct in6_addr *a2,
361 unsigned int prefixlen)
362{
363 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
364 prefixlen);
365}
366
367struct inet_frag_queue;
368
369enum ip6_defrag_users {
370 IP6_DEFRAG_LOCAL_DELIVER,
371 IP6_DEFRAG_CONNTRACK_IN,
372 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
373 IP6_DEFRAG_CONNTRACK_OUT,
374 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
375 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
376 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
377};
378
379struct ip6_create_arg {
380 __be32 id;
381 u32 user;
382 const struct in6_addr *src;
383 const struct in6_addr *dst;
384};
385
386void ip6_frag_init(struct inet_frag_queue *q, void *a);
387int ip6_frag_match(struct inet_frag_queue *q, void *a);
388
389static inline int ipv6_addr_any(const struct in6_addr *a)
390{
391 return (a->s6_addr32[0] | a->s6_addr32[1] |
392 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
393}
394
395static inline int ipv6_addr_loopback(const struct in6_addr *a)
396{
397 return (a->s6_addr32[0] | a->s6_addr32[1] |
398 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
399}
400
401static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
402{
403 return (a->s6_addr32[0] | a->s6_addr32[1] |
404 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0;
405}
406
407/*
408 * Check for a RFC 4843 ORCHID address
409 * (Overlay Routable Cryptographic Hash Identifiers)
410 */
411static inline int ipv6_addr_orchid(const struct in6_addr *a)
412{
413 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
414}
415
416static inline void ipv6_addr_set_v4mapped(const __be32 addr,
417 struct in6_addr *v4mapped)
418{
419 ipv6_addr_set(v4mapped,
420 0, 0,
421 htonl(0x0000FFFF),
422 addr);
423}
424
425/*
426 * find the first different bit between two addresses
427 * length of address must be a multiple of 32bits
428 */
429static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
430{
431 const __be32 *a1 = token1, *a2 = token2;
432 int i;
433
434 addrlen >>= 2;
435
436 for (i = 0; i < addrlen; i++) {
437 __be32 xb = a1[i] ^ a2[i];
438 if (xb)
439 return i * 32 + 31 - __fls(ntohl(xb));
440 }
441
442 /*
443 * we should *never* get to this point since that
444 * would mean the addrs are equal
445 *
446 * However, we do get to it 8) And exacly, when
447 * addresses are equal 8)
448 *
449 * ip route add 1111::/128 via ...
450 * ip route add 1111::/64 via ...
451 * and we are here.
452 *
453 * Ideally, this function should stop comparison
454 * at prefix length. It does not, but it is still OK,
455 * if returned value is greater than prefix length.
456 * --ANK (980803)
457 */
458 return addrlen << 5;
459}
460
461static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
462{
463 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
464}
465
466extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
467
468/*
469 * Prototypes exported by ipv6
470 */
471
472/*
473 * rcv function (called from netdevice level)
474 */
475
476extern int ipv6_rcv(struct sk_buff *skb,
477 struct net_device *dev,
478 struct packet_type *pt,
479 struct net_device *orig_dev);
480
481extern int ip6_rcv_finish(struct sk_buff *skb);
482
483/*
484 * upper-layer output functions
485 */
486extern int ip6_xmit(struct sock *sk,
487 struct sk_buff *skb,
488 struct flowi6 *fl6,
489 struct ipv6_txoptions *opt);
490
491extern int ip6_nd_hdr(struct sock *sk,
492 struct sk_buff *skb,
493 struct net_device *dev,
494 const struct in6_addr *saddr,
495 const struct in6_addr *daddr,
496 int proto, int len);
497
498extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
499
500extern int ip6_append_data(struct sock *sk,
501 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
502 void *from,
503 int length,
504 int transhdrlen,
505 int hlimit,
506 int tclass,
507 struct ipv6_txoptions *opt,
508 struct flowi6 *fl6,
509 struct rt6_info *rt,
510 unsigned int flags,
511 int dontfrag);
512
513extern int ip6_push_pending_frames(struct sock *sk);
514
515extern void ip6_flush_pending_frames(struct sock *sk);
516
517extern int ip6_dst_lookup(struct sock *sk,
518 struct dst_entry **dst,
519 struct flowi6 *fl6);
520extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
521 struct flowi6 *fl6,
522 const struct in6_addr *final_dst,
523 bool can_sleep);
524extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
525 struct flowi6 *fl6,
526 const struct in6_addr *final_dst,
527 bool can_sleep);
528extern struct dst_entry * ip6_blackhole_route(struct net *net,
529 struct dst_entry *orig_dst);
530
531/*
532 * skb processing functions
533 */
534
535extern int ip6_output(struct sk_buff *skb);
536extern int ip6_forward(struct sk_buff *skb);
537extern int ip6_input(struct sk_buff *skb);
538extern int ip6_mc_input(struct sk_buff *skb);
539
540extern int __ip6_local_out(struct sk_buff *skb);
541extern int ip6_local_out(struct sk_buff *skb);
542
543/*
544 * Extension header (options) processing
545 */
546
547extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
548 struct ipv6_txoptions *opt,
549 u8 *proto,
550 struct in6_addr **daddr_p);
551extern void ipv6_push_frag_opts(struct sk_buff *skb,
552 struct ipv6_txoptions *opt,
553 u8 *proto);
554
555extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
556 u8 *nexthdrp);
557
558extern int ipv6_ext_hdr(u8 nexthdr);
559
560extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
561
562extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
563 const struct ipv6_txoptions *opt,
564 struct in6_addr *orig);
565
566/*
567 * socket options (ipv6_sockglue.c)
568 */
569
570extern int ipv6_setsockopt(struct sock *sk, int level,
571 int optname,
572 char __user *optval,
573 unsigned int optlen);
574extern int ipv6_getsockopt(struct sock *sk, int level,
575 int optname,
576 char __user *optval,
577 int __user *optlen);
578extern int compat_ipv6_setsockopt(struct sock *sk,
579 int level,
580 int optname,
581 char __user *optval,
582 unsigned int optlen);
583extern int compat_ipv6_getsockopt(struct sock *sk,
584 int level,
585 int optname,
586 char __user *optval,
587 int __user *optlen);
588
589extern int ip6_datagram_connect(struct sock *sk,
590 struct sockaddr *addr, int addr_len);
591
592extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
593extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
594extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
595 u32 info, u8 *payload);
596extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
597extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
598
599extern int inet6_release(struct socket *sock);
600extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
601 int addr_len);
602extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
603 int *uaddr_len, int peer);
604extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
605 unsigned long arg);
606
607extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
608 struct sock *sk);
609
610/*
611 * reassembly.c
612 */
613extern const struct proto_ops inet6_stream_ops;
614extern const struct proto_ops inet6_dgram_ops;
615
616struct group_source_req;
617struct group_filter;
618
619extern int ip6_mc_source(int add, int omode, struct sock *sk,
620 struct group_source_req *pgsr);
621extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
622extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
623 struct group_filter __user *optval,
624 int __user *optlen);
625extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
626 const struct in6_addr *daddr, u32 rnd);
627
628#ifdef CONFIG_PROC_FS
629extern int ac6_proc_init(struct net *net);
630extern void ac6_proc_exit(struct net *net);
631extern int raw6_proc_init(void);
632extern void raw6_proc_exit(void);
633extern int tcp6_proc_init(struct net *net);
634extern void tcp6_proc_exit(struct net *net);
635extern int udp6_proc_init(struct net *net);
636extern void udp6_proc_exit(struct net *net);
637extern int udplite6_proc_init(void);
638extern void udplite6_proc_exit(void);
639extern int ipv6_misc_proc_init(void);
640extern void ipv6_misc_proc_exit(void);
641extern int snmp6_register_dev(struct inet6_dev *idev);
642extern int snmp6_unregister_dev(struct inet6_dev *idev);
643
644#else
645static inline int ac6_proc_init(struct net *net) { return 0; }
646static inline void ac6_proc_exit(struct net *net) { }
647static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
648static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
649#endif
650
651#ifdef CONFIG_SYSCTL
652extern ctl_table ipv6_route_table_template[];
653extern ctl_table ipv6_icmp_table_template[];
654
655extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
656extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
657extern int ipv6_sysctl_register(void);
658extern void ipv6_sysctl_unregister(void);
659extern int ipv6_static_sysctl_register(void);
660extern void ipv6_static_sysctl_unregister(void);
661#endif
662
663#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, mod, idev, field) \
125({ \
126 struct inet6_dev *_idev = (idev); \
127 if (likely(_idev != NULL)) \
128 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
129 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
130})
131
132/* per device counters are atomic_long_t */
133#define _DEVINCATOMIC(net, statname, mod, 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 mod##SNMP_INC_STATS((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, mod, idev, field, val) \
151({ \
152 struct inet6_dev *_idev = (idev); \
153 if (likely(_idev != NULL)) \
154 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
155 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
156})
157
158#define _DEVUPD(net, statname, mod, idev, field, val) \
159({ \
160 struct inet6_dev *_idev = (idev); \
161 if (likely(_idev != NULL)) \
162 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
163 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
164})
165
166/* MIBs */
167
168#define IP6_INC_STATS(net, idev,field) \
169 _DEVINC(net, ipv6, , idev, field)
170#define __IP6_INC_STATS(net, idev,field) \
171 _DEVINC(net, ipv6, __, idev, field)
172#define IP6_ADD_STATS(net, idev,field,val) \
173 _DEVADD(net, ipv6, , idev, field, val)
174#define __IP6_ADD_STATS(net, idev,field,val) \
175 _DEVADD(net, ipv6, __, idev, field, val)
176#define IP6_UPD_PO_STATS(net, idev,field,val) \
177 _DEVUPD(net, ipv6, , idev, field, val)
178#define __IP6_UPD_PO_STATS(net, idev,field,val) \
179 _DEVUPD(net, ipv6, __, idev, field, val)
180#define ICMP6_INC_STATS(net, idev, field) \
181 _DEVINCATOMIC(net, icmpv6, , idev, field)
182#define __ICMP6_INC_STATS(net, idev, field) \
183 _DEVINCATOMIC(net, icmpv6, __, idev, field)
184
185#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
187#define ICMP6MSGIN_INC_STATS(net, idev, field) \
188 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
189
190struct ip6_ra_chain {
191 struct ip6_ra_chain *next;
192 struct sock *sk;
193 int sel;
194 void (*destructor)(struct sock *);
195};
196
197extern struct ip6_ra_chain *ip6_ra_chain;
198extern rwlock_t ip6_ra_lock;
199
200/*
201 This structure is prepared by protocol, when parsing
202 ancillary data and passed to IPv6.
203 */
204
205struct ipv6_txoptions {
206 atomic_t refcnt;
207 /* Length of this structure */
208 int tot_len;
209
210 /* length of extension headers */
211
212 __u16 opt_flen; /* after fragment hdr */
213 __u16 opt_nflen; /* before fragment hdr */
214
215 struct ipv6_opt_hdr *hopopt;
216 struct ipv6_opt_hdr *dst0opt;
217 struct ipv6_rt_hdr *srcrt; /* Routing Header */
218 struct ipv6_opt_hdr *dst1opt;
219 struct rcu_head rcu;
220 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
221};
222
223struct ip6_flowlabel {
224 struct ip6_flowlabel __rcu *next;
225 __be32 label;
226 atomic_t users;
227 struct in6_addr dst;
228 struct ipv6_txoptions *opt;
229 unsigned long linger;
230 struct rcu_head rcu;
231 u8 share;
232 union {
233 struct pid *pid;
234 kuid_t uid;
235 } owner;
236 unsigned long lastuse;
237 unsigned long expires;
238 struct net *fl_net;
239};
240
241#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
242#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
243#define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
244
245#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
246#define IPV6_TCLASS_SHIFT 20
247
248struct ipv6_fl_socklist {
249 struct ipv6_fl_socklist __rcu *next;
250 struct ip6_flowlabel *fl;
251 struct rcu_head rcu;
252};
253
254struct ipcm6_cookie {
255 __s16 hlimit;
256 __s16 tclass;
257 __s8 dontfrag;
258 struct ipv6_txoptions *opt;
259};
260
261static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
262{
263 struct ipv6_txoptions *opt;
264
265 rcu_read_lock();
266 opt = rcu_dereference(np->opt);
267 if (opt) {
268 if (!atomic_inc_not_zero(&opt->refcnt))
269 opt = NULL;
270 else
271 opt = rcu_pointer_handoff(opt);
272 }
273 rcu_read_unlock();
274 return opt;
275}
276
277static inline void txopt_put(struct ipv6_txoptions *opt)
278{
279 if (opt && atomic_dec_and_test(&opt->refcnt))
280 kfree_rcu(opt, rcu);
281}
282
283struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
284struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
285 struct ip6_flowlabel *fl,
286 struct ipv6_txoptions *fopt);
287void fl6_free_socklist(struct sock *sk);
288int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
289int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
290 int flags);
291int ip6_flowlabel_init(void);
292void ip6_flowlabel_cleanup(void);
293
294static inline void fl6_sock_release(struct ip6_flowlabel *fl)
295{
296 if (fl)
297 atomic_dec(&fl->users);
298}
299
300void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
301
302int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
303 struct icmp6hdr *thdr, int len);
304
305int ip6_ra_control(struct sock *sk, int sel);
306
307int ipv6_parse_hopopts(struct sk_buff *skb);
308
309struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
310 struct ipv6_txoptions *opt);
311struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
312 struct ipv6_txoptions *opt,
313 int newtype,
314 struct ipv6_opt_hdr __user *newopt,
315 int newoptlen);
316struct ipv6_txoptions *
317ipv6_renew_options_kern(struct sock *sk,
318 struct ipv6_txoptions *opt,
319 int newtype,
320 struct ipv6_opt_hdr *newopt,
321 int newoptlen);
322struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
323 struct ipv6_txoptions *opt);
324
325bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
326 const struct inet6_skb_parm *opt);
327struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
328 struct ipv6_txoptions *opt);
329
330static inline bool ipv6_accept_ra(struct inet6_dev *idev)
331{
332 /* If forwarding is enabled, RA are not accepted unless the special
333 * hybrid mode (accept_ra=2) is enabled.
334 */
335 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
336 idev->cnf.accept_ra;
337}
338
339#if IS_ENABLED(CONFIG_IPV6)
340static inline int ip6_frag_mem(struct net *net)
341{
342 return sum_frag_mem_limit(&net->ipv6.frags);
343}
344#endif
345
346#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
347#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
348#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
349
350int __ipv6_addr_type(const struct in6_addr *addr);
351static inline int ipv6_addr_type(const struct in6_addr *addr)
352{
353 return __ipv6_addr_type(addr) & 0xffff;
354}
355
356static inline int ipv6_addr_scope(const struct in6_addr *addr)
357{
358 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
359}
360
361static inline int __ipv6_addr_src_scope(int type)
362{
363 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
364}
365
366static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
367{
368 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
369}
370
371static inline bool __ipv6_addr_needs_scope_id(int type)
372{
373 return type & IPV6_ADDR_LINKLOCAL ||
374 (type & IPV6_ADDR_MULTICAST &&
375 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
376}
377
378static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
379{
380 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
381}
382
383static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
384{
385 return memcmp(a1, a2, sizeof(struct in6_addr));
386}
387
388static inline bool
389ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
390 const struct in6_addr *a2)
391{
392#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
393 const unsigned long *ul1 = (const unsigned long *)a1;
394 const unsigned long *ulm = (const unsigned long *)m;
395 const unsigned long *ul2 = (const unsigned long *)a2;
396
397 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
398 ((ul1[1] ^ ul2[1]) & ulm[1]));
399#else
400 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
401 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
402 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
403 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
404#endif
405}
406
407static inline void ipv6_addr_prefix(struct in6_addr *pfx,
408 const struct in6_addr *addr,
409 int plen)
410{
411 /* caller must guarantee 0 <= plen <= 128 */
412 int o = plen >> 3,
413 b = plen & 0x7;
414
415 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
416 memcpy(pfx->s6_addr, addr, o);
417 if (b != 0)
418 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
419}
420
421static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
422 const struct in6_addr *pfx,
423 int plen)
424{
425 /* caller must guarantee 0 <= plen <= 128 */
426 int o = plen >> 3,
427 b = plen & 0x7;
428
429 memcpy(addr->s6_addr, pfx, o);
430 if (b != 0) {
431 addr->s6_addr[o] &= ~(0xff00 >> b);
432 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
433 }
434}
435
436static inline void __ipv6_addr_set_half(__be32 *addr,
437 __be32 wh, __be32 wl)
438{
439#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
440#if defined(__BIG_ENDIAN)
441 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
442 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
443 return;
444 }
445#elif defined(__LITTLE_ENDIAN)
446 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
447 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
448 return;
449 }
450#endif
451#endif
452 addr[0] = wh;
453 addr[1] = wl;
454}
455
456static inline void ipv6_addr_set(struct in6_addr *addr,
457 __be32 w1, __be32 w2,
458 __be32 w3, __be32 w4)
459{
460 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
461 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
462}
463
464static inline bool ipv6_addr_equal(const struct in6_addr *a1,
465 const struct in6_addr *a2)
466{
467#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
468 const unsigned long *ul1 = (const unsigned long *)a1;
469 const unsigned long *ul2 = (const unsigned long *)a2;
470
471 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
472#else
473 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
474 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
475 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
476 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
477#endif
478}
479
480#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
481static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
482 const __be64 *a2,
483 unsigned int len)
484{
485 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
486 return false;
487 return true;
488}
489
490static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
491 const struct in6_addr *addr2,
492 unsigned int prefixlen)
493{
494 const __be64 *a1 = (const __be64 *)addr1;
495 const __be64 *a2 = (const __be64 *)addr2;
496
497 if (prefixlen >= 64) {
498 if (a1[0] ^ a2[0])
499 return false;
500 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
501 }
502 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
503}
504#else
505static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
506 const struct in6_addr *addr2,
507 unsigned int prefixlen)
508{
509 const __be32 *a1 = addr1->s6_addr32;
510 const __be32 *a2 = addr2->s6_addr32;
511 unsigned int pdw, pbi;
512
513 /* check complete u32 in prefix */
514 pdw = prefixlen >> 5;
515 if (pdw && memcmp(a1, a2, pdw << 2))
516 return false;
517
518 /* check incomplete u32 in prefix */
519 pbi = prefixlen & 0x1f;
520 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
521 return false;
522
523 return true;
524}
525#endif
526
527struct inet_frag_queue;
528
529enum ip6_defrag_users {
530 IP6_DEFRAG_LOCAL_DELIVER,
531 IP6_DEFRAG_CONNTRACK_IN,
532 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
533 IP6_DEFRAG_CONNTRACK_OUT,
534 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
535 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
536 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
537};
538
539struct ip6_create_arg {
540 __be32 id;
541 u32 user;
542 const struct in6_addr *src;
543 const struct in6_addr *dst;
544 int iif;
545 u8 ecn;
546};
547
548void ip6_frag_init(struct inet_frag_queue *q, const void *a);
549bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
550
551/*
552 * Equivalent of ipv4 struct ip
553 */
554struct frag_queue {
555 struct inet_frag_queue q;
556
557 __be32 id; /* fragment id */
558 u32 user;
559 struct in6_addr saddr;
560 struct in6_addr daddr;
561
562 int iif;
563 unsigned int csum;
564 __u16 nhoffset;
565 u8 ecn;
566};
567
568void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
569 struct inet_frags *frags);
570
571static inline bool ipv6_addr_any(const struct in6_addr *a)
572{
573#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
574 const unsigned long *ul = (const unsigned long *)a;
575
576 return (ul[0] | ul[1]) == 0UL;
577#else
578 return (a->s6_addr32[0] | a->s6_addr32[1] |
579 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
580#endif
581}
582
583static inline u32 ipv6_addr_hash(const struct in6_addr *a)
584{
585#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
586 const unsigned long *ul = (const unsigned long *)a;
587 unsigned long x = ul[0] ^ ul[1];
588
589 return (u32)(x ^ (x >> 32));
590#else
591 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
592 a->s6_addr32[2] ^ a->s6_addr32[3]);
593#endif
594}
595
596/* more secured version of ipv6_addr_hash() */
597static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
598{
599 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
600
601 return jhash_3words(v,
602 (__force u32)a->s6_addr32[2],
603 (__force u32)a->s6_addr32[3],
604 initval);
605}
606
607static inline bool ipv6_addr_loopback(const struct in6_addr *a)
608{
609#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
610 const __be64 *be = (const __be64 *)a;
611
612 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
613#else
614 return (a->s6_addr32[0] | a->s6_addr32[1] |
615 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
616#endif
617}
618
619/*
620 * Note that we must __force cast these to unsigned long to make sparse happy,
621 * since all of the endian-annotated types are fixed size regardless of arch.
622 */
623static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
624{
625 return (
626#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
627 *(unsigned long *)a |
628#else
629 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
630#endif
631 (__force unsigned long)(a->s6_addr32[2] ^
632 cpu_to_be32(0x0000ffff))) == 0UL;
633}
634
635/*
636 * Check for a RFC 4843 ORCHID address
637 * (Overlay Routable Cryptographic Hash Identifiers)
638 */
639static inline bool ipv6_addr_orchid(const struct in6_addr *a)
640{
641 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
642}
643
644static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
645{
646 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
647}
648
649static inline void ipv6_addr_set_v4mapped(const __be32 addr,
650 struct in6_addr *v4mapped)
651{
652 ipv6_addr_set(v4mapped,
653 0, 0,
654 htonl(0x0000FFFF),
655 addr);
656}
657
658/*
659 * find the first different bit between two addresses
660 * length of address must be a multiple of 32bits
661 */
662static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
663{
664 const __be32 *a1 = token1, *a2 = token2;
665 int i;
666
667 addrlen >>= 2;
668
669 for (i = 0; i < addrlen; i++) {
670 __be32 xb = a1[i] ^ a2[i];
671 if (xb)
672 return i * 32 + 31 - __fls(ntohl(xb));
673 }
674
675 /*
676 * we should *never* get to this point since that
677 * would mean the addrs are equal
678 *
679 * However, we do get to it 8) And exacly, when
680 * addresses are equal 8)
681 *
682 * ip route add 1111::/128 via ...
683 * ip route add 1111::/64 via ...
684 * and we are here.
685 *
686 * Ideally, this function should stop comparison
687 * at prefix length. It does not, but it is still OK,
688 * if returned value is greater than prefix length.
689 * --ANK (980803)
690 */
691 return addrlen << 5;
692}
693
694#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
695static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
696{
697 const __be64 *a1 = token1, *a2 = token2;
698 int i;
699
700 addrlen >>= 3;
701
702 for (i = 0; i < addrlen; i++) {
703 __be64 xb = a1[i] ^ a2[i];
704 if (xb)
705 return i * 64 + 63 - __fls(be64_to_cpu(xb));
706 }
707
708 return addrlen << 6;
709}
710#endif
711
712static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
713{
714#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
715 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
716 return __ipv6_addr_diff64(token1, token2, addrlen);
717#endif
718 return __ipv6_addr_diff32(token1, token2, addrlen);
719}
720
721static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
722{
723 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
724}
725
726__be32 ipv6_select_ident(struct net *net,
727 const struct in6_addr *daddr,
728 const struct in6_addr *saddr);
729void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
730
731int ip6_dst_hoplimit(struct dst_entry *dst);
732
733static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
734 struct dst_entry *dst)
735{
736 int hlimit;
737
738 if (ipv6_addr_is_multicast(&fl6->daddr))
739 hlimit = np->mcast_hops;
740 else
741 hlimit = np->hop_limit;
742 if (hlimit < 0)
743 hlimit = ip6_dst_hoplimit(dst);
744 return hlimit;
745}
746
747/* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
748 * Equivalent to : flow->v6addrs.src = iph->saddr;
749 * flow->v6addrs.dst = iph->daddr;
750 */
751static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
752 const struct ipv6hdr *iph)
753{
754 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
755 offsetof(typeof(flow->addrs), v6addrs.src) +
756 sizeof(flow->addrs.v6addrs.src));
757 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
758 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
759}
760
761#if IS_ENABLED(CONFIG_IPV6)
762
763/* Sysctl settings for net ipv6.auto_flowlabels */
764#define IP6_AUTO_FLOW_LABEL_OFF 0
765#define IP6_AUTO_FLOW_LABEL_OPTOUT 1
766#define IP6_AUTO_FLOW_LABEL_OPTIN 2
767#define IP6_AUTO_FLOW_LABEL_FORCED 3
768
769#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
770
771#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
772
773static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
774 __be32 flowlabel, bool autolabel,
775 struct flowi6 *fl6)
776{
777 u32 hash;
778
779 /* @flowlabel may include more than a flow label, eg, the traffic class.
780 * Here we want only the flow label value.
781 */
782 flowlabel &= IPV6_FLOWLABEL_MASK;
783
784 if (flowlabel ||
785 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
786 (!autolabel &&
787 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
788 return flowlabel;
789
790 hash = skb_get_hash_flowi6(skb, fl6);
791
792 /* Since this is being sent on the wire obfuscate hash a bit
793 * to minimize possbility that any useful information to an
794 * attacker is leaked. Only lower 20 bits are relevant.
795 */
796 rol32(hash, 16);
797
798 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
799
800 if (net->ipv6.sysctl.flowlabel_state_ranges)
801 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
802
803 return flowlabel;
804}
805
806static inline int ip6_default_np_autolabel(struct net *net)
807{
808 switch (net->ipv6.sysctl.auto_flowlabels) {
809 case IP6_AUTO_FLOW_LABEL_OFF:
810 case IP6_AUTO_FLOW_LABEL_OPTIN:
811 default:
812 return 0;
813 case IP6_AUTO_FLOW_LABEL_OPTOUT:
814 case IP6_AUTO_FLOW_LABEL_FORCED:
815 return 1;
816 }
817}
818#else
819static inline void ip6_set_txhash(struct sock *sk) { }
820static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
821 __be32 flowlabel, bool autolabel,
822 struct flowi6 *fl6)
823{
824 return flowlabel;
825}
826static inline int ip6_default_np_autolabel(struct net *net)
827{
828 return 0;
829}
830#endif
831
832
833/*
834 * Header manipulation
835 */
836static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
837 __be32 flowlabel)
838{
839 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
840}
841
842static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
843{
844 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
845}
846
847static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
848{
849 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
850}
851
852static inline u8 ip6_tclass(__be32 flowinfo)
853{
854 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
855}
856
857static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
858{
859 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
860}
861
862/*
863 * Prototypes exported by ipv6
864 */
865
866/*
867 * rcv function (called from netdevice level)
868 */
869
870int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
871 struct packet_type *pt, struct net_device *orig_dev);
872
873int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
874
875/*
876 * upper-layer output functions
877 */
878int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
879 __u32 mark, struct ipv6_txoptions *opt, int tclass);
880
881int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
882
883int ip6_append_data(struct sock *sk,
884 int getfrag(void *from, char *to, int offset, int len,
885 int odd, struct sk_buff *skb),
886 void *from, int length, int transhdrlen,
887 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
888 struct rt6_info *rt, unsigned int flags,
889 const struct sockcm_cookie *sockc);
890
891int ip6_push_pending_frames(struct sock *sk);
892
893void ip6_flush_pending_frames(struct sock *sk);
894
895int ip6_send_skb(struct sk_buff *skb);
896
897struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
898 struct inet_cork_full *cork,
899 struct inet6_cork *v6_cork);
900struct sk_buff *ip6_make_skb(struct sock *sk,
901 int getfrag(void *from, char *to, int offset,
902 int len, int odd, struct sk_buff *skb),
903 void *from, int length, int transhdrlen,
904 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
905 struct rt6_info *rt, unsigned int flags,
906 const struct sockcm_cookie *sockc);
907
908static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
909{
910 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
911 &inet6_sk(sk)->cork);
912}
913
914int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
915 struct flowi6 *fl6);
916struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
917 const struct in6_addr *final_dst);
918struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
919 const struct in6_addr *final_dst);
920struct dst_entry *ip6_blackhole_route(struct net *net,
921 struct dst_entry *orig_dst);
922
923/*
924 * skb processing functions
925 */
926
927int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
928int ip6_forward(struct sk_buff *skb);
929int ip6_input(struct sk_buff *skb);
930int ip6_mc_input(struct sk_buff *skb);
931
932int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
933int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
934
935/*
936 * Extension header (options) processing
937 */
938
939void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
940 u8 *proto, struct in6_addr **daddr_p,
941 struct in6_addr *saddr);
942void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
943 u8 *proto);
944
945int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
946 __be16 *frag_offp);
947
948bool ipv6_ext_hdr(u8 nexthdr);
949
950enum {
951 IP6_FH_F_FRAG = (1 << 0),
952 IP6_FH_F_AUTH = (1 << 1),
953 IP6_FH_F_SKIP_RH = (1 << 2),
954};
955
956/* find specified header and get offset to it */
957int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
958 unsigned short *fragoff, int *fragflg);
959
960int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
961
962struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
963 const struct ipv6_txoptions *opt,
964 struct in6_addr *orig);
965
966/*
967 * socket options (ipv6_sockglue.c)
968 */
969
970int ipv6_setsockopt(struct sock *sk, int level, int optname,
971 char __user *optval, unsigned int optlen);
972int ipv6_getsockopt(struct sock *sk, int level, int optname,
973 char __user *optval, int __user *optlen);
974int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
975 char __user *optval, unsigned int optlen);
976int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
977 char __user *optval, int __user *optlen);
978
979int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
980 int addr_len);
981int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
982int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
983 int addr_len);
984int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
985void ip6_datagram_release_cb(struct sock *sk);
986
987int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
988 int *addr_len);
989int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
990 int *addr_len);
991void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
992 u32 info, u8 *payload);
993void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
994void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
995
996int inet6_release(struct socket *sock);
997int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
998int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
999 int peer);
1000int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1001
1002int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1003 struct sock *sk);
1004
1005/*
1006 * reassembly.c
1007 */
1008extern const struct proto_ops inet6_stream_ops;
1009extern const struct proto_ops inet6_dgram_ops;
1010
1011struct group_source_req;
1012struct group_filter;
1013
1014int ip6_mc_source(int add, int omode, struct sock *sk,
1015 struct group_source_req *pgsr);
1016int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
1017int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1018 struct group_filter __user *optval, int __user *optlen);
1019
1020#ifdef CONFIG_PROC_FS
1021int ac6_proc_init(struct net *net);
1022void ac6_proc_exit(struct net *net);
1023int raw6_proc_init(void);
1024void raw6_proc_exit(void);
1025int tcp6_proc_init(struct net *net);
1026void tcp6_proc_exit(struct net *net);
1027int udp6_proc_init(struct net *net);
1028void udp6_proc_exit(struct net *net);
1029int udplite6_proc_init(void);
1030void udplite6_proc_exit(void);
1031int ipv6_misc_proc_init(void);
1032void ipv6_misc_proc_exit(void);
1033int snmp6_register_dev(struct inet6_dev *idev);
1034int snmp6_unregister_dev(struct inet6_dev *idev);
1035
1036#else
1037static inline int ac6_proc_init(struct net *net) { return 0; }
1038static inline void ac6_proc_exit(struct net *net) { }
1039static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1040static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1041#endif
1042
1043#ifdef CONFIG_SYSCTL
1044extern struct ctl_table ipv6_route_table_template[];
1045
1046struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1047struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1048int ipv6_sysctl_register(void);
1049void ipv6_sysctl_unregister(void);
1050#endif
1051
1052int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1053 const struct in6_addr *addr);
1054int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1055 const struct in6_addr *addr);
1056#endif /* _NET_IPV6_H */