2 * Linux INET6 implementation
5 * Pedro Roque <roque@di.fc.ul.pt>
7 * $Id: ipv6.h,v 1.1 2002/05/20 15:13:07 jgrimm Exp $
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
18 #include <linux/ipv6.h>
19 #include <linux/hardirq.h>
20 #include <net/if_inet6.h>
21 #include <net/ndisc.h>
25 #define SIN6_LEN_RFC2133 24
27 #define IPV6_MAXPLEN 65535
30 * NextHeader field of IPv6 header
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_ESP 50 /* Encapsulating security payload. */
40 #define NEXTHDR_AUTH 51 /* Authentication header. */
41 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
42 #define NEXTHDR_NONE 59 /* No next header */
43 #define NEXTHDR_DEST 60 /* Destination options header. */
44 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
46 #define NEXTHDR_MAX 255
50 #define IPV6_DEFAULT_HOPLIMIT 64
51 #define IPV6_DEFAULT_MCASTHOPS 1
56 * type - unicast | multicast
57 * scope - local | site | global
64 #define IPV6_ADDR_ANY 0x0000U
66 #define IPV6_ADDR_UNICAST 0x0001U
67 #define IPV6_ADDR_MULTICAST 0x0002U
69 #define IPV6_ADDR_LOOPBACK 0x0010U
70 #define IPV6_ADDR_LINKLOCAL 0x0020U
71 #define IPV6_ADDR_SITELOCAL 0x0040U
73 #define IPV6_ADDR_COMPATv4 0x0080U
75 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
77 #define IPV6_ADDR_MAPPED 0x1000U
78 #define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */
84 #define IPV6_ADDR_MC_SCOPE(a) \
85 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
86 #define __IPV6_ADDR_SCOPE_INVALID -1
88 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
89 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
90 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
91 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
92 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
95 * fragmentation header
102 __be32 identification;
105 #define IP6_MF 0x0001
109 #include <net/sock.h>
112 extern int sysctl_mld_max_msf;
113 extern struct ctl_path net_ipv6_ctl_path[];
115 #define _DEVINC(statname, modifier, idev, field) \
117 struct inet6_dev *_idev = (idev); \
118 if (likely(_idev != NULL)) \
119 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
120 SNMP_INC_STATS##modifier(statname##_statistics, (field)); \
123 #define _DEVADD(statname, modifier, idev, field, val) \
125 struct inet6_dev *_idev = (idev); \
126 if (likely(_idev != NULL)) \
127 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
128 SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\
132 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
134 #define IP6_INC_STATS(idev,field) _DEVINC(ipv6, , idev, field)
135 #define IP6_INC_STATS_BH(idev,field) _DEVINC(ipv6, _BH, idev, field)
136 #define IP6_INC_STATS_USER(idev,field) _DEVINC(ipv6, _USER, idev, field)
137 #define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val)
139 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
140 DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics);
142 #define ICMP6_INC_STATS(idev, field) _DEVINC(icmpv6, , idev, field)
143 #define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field)
144 #define ICMP6_INC_STATS_USER(idev, field) _DEVINC(icmpv6, _USER, idev, field)
146 #define ICMP6MSGOUT_INC_STATS(idev, field) \
147 _DEVINC(icmpv6msg, , idev, field +256)
148 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
149 _DEVINC(icmpv6msg, _BH, idev, field +256)
150 #define ICMP6MSGOUT_INC_STATS_USER(idev, field) \
151 _DEVINC(icmpv6msg, _USER, idev, field +256)
152 #define ICMP6MSGIN_INC_STATS(idev, field) \
153 _DEVINC(icmpv6msg, , idev, field)
154 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \
155 _DEVINC(icmpv6msg, _BH, idev, field)
156 #define ICMP6MSGIN_INC_STATS_USER(idev, field) \
157 _DEVINC(icmpv6msg, _USER, idev, field)
161 struct ip6_ra_chain *next;
164 void (*destructor)(struct sock *);
167 extern struct ip6_ra_chain *ip6_ra_chain;
168 extern rwlock_t ip6_ra_lock;
171 This structure is prepared by protocol, when parsing
172 ancillary data and passed to IPv6.
175 struct ipv6_txoptions
177 /* Length of this structure */
180 /* length of extension headers */
182 __u16 opt_flen; /* after fragment hdr */
183 __u16 opt_nflen; /* before fragment hdr */
185 struct ipv6_opt_hdr *hopopt;
186 struct ipv6_opt_hdr *dst0opt;
187 struct ipv6_rt_hdr *srcrt; /* Routing Header */
188 struct ipv6_opt_hdr *dst1opt;
190 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
195 struct ip6_flowlabel *next;
199 struct ipv6_txoptions *opt;
200 unsigned long linger;
203 unsigned long lastuse;
204 unsigned long expires;
207 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
208 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
210 struct ipv6_fl_socklist
212 struct ipv6_fl_socklist *next;
213 struct ip6_flowlabel *fl;
216 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
217 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
218 struct ip6_flowlabel * fl,
219 struct ipv6_txoptions * fopt);
220 extern void fl6_free_socklist(struct sock *sk);
221 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
222 extern int ip6_flowlabel_init(void);
223 extern void ip6_flowlabel_cleanup(void);
225 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
228 atomic_dec(&fl->users);
231 extern int ip6_ra_control(struct sock *sk, int sel,
232 void (*destructor)(struct sock *));
235 extern int ipv6_parse_hopopts(struct sk_buff *skb);
237 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
238 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
240 struct ipv6_opt_hdr __user *newopt,
242 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
243 struct ipv6_txoptions *opt);
245 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
247 int ip6_frag_nqueues(struct net *net);
248 int ip6_frag_mem(struct net *net);
250 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
253 * Function prototype for build_xmit
256 typedef int (*inet_getfrag_t) (const void *data,
257 struct in6_addr *addr,
259 unsigned int, unsigned int);
261 extern int __ipv6_addr_type(const struct in6_addr *addr);
262 static inline int ipv6_addr_type(const struct in6_addr *addr)
264 return __ipv6_addr_type(addr) & 0xffff;
267 static inline int ipv6_addr_scope(const struct in6_addr *addr)
269 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
272 static inline int __ipv6_addr_src_scope(int type)
274 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
277 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
279 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
282 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
284 return memcmp(a1, a2, sizeof(struct in6_addr));
288 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
289 const struct in6_addr *a2)
293 for (i = 0; i < 4; i++)
294 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
299 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
301 memcpy(a1, a2, sizeof(struct in6_addr));
304 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
305 const struct in6_addr *addr,
308 /* caller must guarantee 0 <= plen <= 128 */
312 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
313 memcpy(pfx->s6_addr, addr, o);
315 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
318 static inline void ipv6_addr_set(struct in6_addr *addr,
319 __be32 w1, __be32 w2,
320 __be32 w3, __be32 w4)
322 addr->s6_addr32[0] = w1;
323 addr->s6_addr32[1] = w2;
324 addr->s6_addr32[2] = w3;
325 addr->s6_addr32[3] = w4;
328 static inline int ipv6_addr_equal(const struct in6_addr *a1,
329 const struct in6_addr *a2)
331 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
332 a1->s6_addr32[1] == a2->s6_addr32[1] &&
333 a1->s6_addr32[2] == a2->s6_addr32[2] &&
334 a1->s6_addr32[3] == a2->s6_addr32[3]);
337 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
338 unsigned int prefixlen)
342 /* check complete u32 in prefix */
343 pdw = prefixlen >> 5;
344 if (pdw && memcmp(a1, a2, pdw << 2))
347 /* check incomplete u32 in prefix */
348 pbi = prefixlen & 0x1f;
349 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
355 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
356 const struct in6_addr *a2,
357 unsigned int prefixlen)
359 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
363 struct inet_frag_queue;
365 struct ip6_create_arg {
367 struct in6_addr *src;
368 struct in6_addr *dst;
371 void ip6_frag_init(struct inet_frag_queue *q, void *a);
372 int ip6_frag_match(struct inet_frag_queue *q, void *a);
374 static inline int ipv6_addr_any(const struct in6_addr *a)
376 return ((a->s6_addr32[0] | a->s6_addr32[1] |
377 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
380 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
382 return ((a->s6_addr32[0] | a->s6_addr32[1]) == 0 &&
383 a->s6_addr32[2] == htonl(0x0000ffff));
387 * Check for a RFC 4843 ORCHID address
388 * (Overlay Routable Cryptographic Hash Identifiers)
390 static inline int ipv6_addr_orchid(const struct in6_addr *a)
392 return ((a->s6_addr32[0] & htonl(0xfffffff0))
393 == htonl(0x20010010));
397 * find the first different bit between two addresses
398 * length of address must be a multiple of 32bits
400 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
402 const __be32 *a1 = token1, *a2 = token2;
407 for (i = 0; i < addrlen; i++) {
408 __be32 xb = a1[i] ^ a2[i];
410 return i * 32 + 32 - fls(ntohl(xb));
414 * we should *never* get to this point since that
415 * would mean the addrs are equal
417 * However, we do get to it 8) And exacly, when
418 * addresses are equal 8)
420 * ip route add 1111::/128 via ...
421 * ip route add 1111::/64 via ...
424 * Ideally, this function should stop comparison
425 * at prefix length. It does not, but it is still OK,
426 * if returned value is greater than prefix length.
429 return (addrlen << 5);
432 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
434 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
438 * Prototypes exported by ipv6
442 * rcv function (called from netdevice level)
445 extern int ipv6_rcv(struct sk_buff *skb,
446 struct net_device *dev,
447 struct packet_type *pt,
448 struct net_device *orig_dev);
450 extern int ip6_rcv_finish(struct sk_buff *skb);
453 * upper-layer output functions
455 extern int ip6_xmit(struct sock *sk,
458 struct ipv6_txoptions *opt,
461 extern int ip6_nd_hdr(struct sock *sk,
463 struct net_device *dev,
464 struct in6_addr *saddr,
465 struct in6_addr *daddr,
468 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
470 extern int ip6_append_data(struct sock *sk,
471 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
477 struct ipv6_txoptions *opt,
482 extern int ip6_push_pending_frames(struct sock *sk);
484 extern void ip6_flush_pending_frames(struct sock *sk);
486 extern int ip6_dst_lookup(struct sock *sk,
487 struct dst_entry **dst,
489 extern int ip6_dst_blackhole(struct sock *sk,
490 struct dst_entry **dst,
492 extern int ip6_sk_dst_lookup(struct sock *sk,
493 struct dst_entry **dst,
497 * skb processing functions
500 extern int ip6_output(struct sk_buff *skb);
501 extern int ip6_forward(struct sk_buff *skb);
502 extern int ip6_input(struct sk_buff *skb);
503 extern int ip6_mc_input(struct sk_buff *skb);
505 extern int __ip6_local_out(struct sk_buff *skb);
506 extern int ip6_local_out(struct sk_buff *skb);
509 * Extension header (options) processing
512 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
514 struct ipv6_txoptions *opt,
515 struct in6_addr *daddr,
517 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
519 struct ipv6_txoptions *opt);
520 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
521 struct ipv6_txoptions *opt,
523 struct in6_addr **daddr_p);
524 extern void ipv6_push_frag_opts(struct sk_buff *skb,
525 struct ipv6_txoptions *opt,
528 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
531 extern int ipv6_ext_hdr(u8 nexthdr);
533 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
536 * socket options (ipv6_sockglue.c)
539 extern int ipv6_setsockopt(struct sock *sk, int level,
543 extern int ipv6_getsockopt(struct sock *sk, int level,
547 extern int compat_ipv6_setsockopt(struct sock *sk,
552 extern int compat_ipv6_getsockopt(struct sock *sk,
558 extern int ip6_datagram_connect(struct sock *sk,
559 struct sockaddr *addr, int addr_len);
561 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
562 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
563 u32 info, u8 *payload);
564 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
566 extern int inet6_release(struct socket *sock);
567 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
569 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
570 int *uaddr_len, int peer);
571 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
574 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
580 extern const struct proto_ops inet6_stream_ops;
581 extern const struct proto_ops inet6_dgram_ops;
583 struct group_source_req;
586 extern int ip6_mc_source(int add, int omode, struct sock *sk,
587 struct group_source_req *pgsr);
588 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
589 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
590 struct group_filter __user *optval,
593 #ifdef CONFIG_PROC_FS
594 extern int ac6_proc_init(void);
595 extern void ac6_proc_exit(void);
596 extern int raw6_proc_init(void);
597 extern void raw6_proc_exit(void);
598 extern int tcp6_proc_init(void);
599 extern void tcp6_proc_exit(void);
600 extern int udp6_proc_init(void);
601 extern void udp6_proc_exit(void);
602 extern int udplite6_proc_init(void);
603 extern void udplite6_proc_exit(void);
604 extern int ipv6_misc_proc_init(void);
605 extern void ipv6_misc_proc_exit(void);
606 extern int snmp6_register_dev(struct inet6_dev *idev);
607 extern int snmp6_unregister_dev(struct inet6_dev *idev);
610 static inline int snmp6_register_dev(struct inet6_dev *idev)
615 static inline int snmp6_unregister_dev(struct inet6_dev *idev)
622 extern ctl_table ipv6_route_table_template[];
623 extern ctl_table ipv6_icmp_table_template[];
625 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
626 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
627 extern int ipv6_sysctl_register(void);
628 extern void ipv6_sysctl_unregister(void);
631 #endif /* __KERNEL__ */
632 #endif /* _NET_IPV6_H */