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_ipv6_bindv6only;
113 extern int sysctl_mld_max_msf;
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 ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \
147 struct inet6_dev *_idev = idev; \
148 __typeof__(offset) _offset = (offset); \
149 if (likely(_idev != NULL)) \
150 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \
151 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \
154 #define ICMP6MSGOUT_INC_STATS(idev, field) \
155 _DEVINC(icmpv6msg, , idev, field +256)
156 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
157 _DEVINC(icmpv6msg, _BH, idev, field +256)
158 #define ICMP6MSGOUT_INC_STATS_USER(idev, field) \
159 _DEVINC(icmpv6msg, _USER, idev, field +256)
160 #define ICMP6MSGIN_INC_STATS(idev, field) \
161 _DEVINC(icmpv6msg, , idev, field)
162 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \
163 _DEVINC(icmpv6msg, _BH, idev, field)
164 #define ICMP6MSGIN_INC_STATS_USER(idev, field) \
165 _DEVINC(icmpv6msg, _USER, idev, field)
169 struct ip6_ra_chain *next;
172 void (*destructor)(struct sock *);
175 extern struct ip6_ra_chain *ip6_ra_chain;
176 extern rwlock_t ip6_ra_lock;
179 This structure is prepared by protocol, when parsing
180 ancillary data and passed to IPv6.
183 struct ipv6_txoptions
185 /* Length of this structure */
188 /* length of extension headers */
190 __u16 opt_flen; /* after fragment hdr */
191 __u16 opt_nflen; /* before fragment hdr */
193 struct ipv6_opt_hdr *hopopt;
194 struct ipv6_opt_hdr *dst0opt;
195 struct ipv6_rt_hdr *srcrt; /* Routing Header */
196 struct ipv6_opt_hdr *dst1opt;
198 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
203 struct ip6_flowlabel *next;
207 struct ipv6_txoptions *opt;
208 unsigned long linger;
211 unsigned long lastuse;
212 unsigned long expires;
215 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
216 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
218 struct ipv6_fl_socklist
220 struct ipv6_fl_socklist *next;
221 struct ip6_flowlabel *fl;
224 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
225 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
226 struct ip6_flowlabel * fl,
227 struct ipv6_txoptions * fopt);
228 extern void fl6_free_socklist(struct sock *sk);
229 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
230 extern void ip6_flowlabel_init(void);
231 extern void ip6_flowlabel_cleanup(void);
233 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
236 atomic_dec(&fl->users);
239 extern int ip6_ra_control(struct sock *sk, int sel,
240 void (*destructor)(struct sock *));
243 extern int ipv6_parse_hopopts(struct sk_buff *skb);
245 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
246 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
248 struct ipv6_opt_hdr __user *newopt,
250 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
251 struct ipv6_txoptions *opt);
253 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
255 int ip6_frag_nqueues(void);
256 int ip6_frag_mem(void);
258 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
261 * Function prototype for build_xmit
264 typedef int (*inet_getfrag_t) (const void *data,
265 struct in6_addr *addr,
267 unsigned int, unsigned int);
269 extern int __ipv6_addr_type(const struct in6_addr *addr);
270 static inline int ipv6_addr_type(const struct in6_addr *addr)
272 return __ipv6_addr_type(addr) & 0xffff;
275 static inline int ipv6_addr_scope(const struct in6_addr *addr)
277 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
280 static inline int __ipv6_addr_src_scope(int type)
282 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
285 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
287 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
290 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
292 return memcmp(a1, a2, sizeof(struct in6_addr));
296 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
297 const struct in6_addr *a2)
301 for (i = 0; i < 4; i++)
302 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
307 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
309 memcpy(a1, a2, sizeof(struct in6_addr));
312 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
313 const struct in6_addr *addr,
316 /* caller must guarantee 0 <= plen <= 128 */
320 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
321 memcpy(pfx->s6_addr, addr, o);
323 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
326 static inline void ipv6_addr_set(struct in6_addr *addr,
327 __be32 w1, __be32 w2,
328 __be32 w3, __be32 w4)
330 addr->s6_addr32[0] = w1;
331 addr->s6_addr32[1] = w2;
332 addr->s6_addr32[2] = w3;
333 addr->s6_addr32[3] = w4;
336 static inline int ipv6_addr_equal(const struct in6_addr *a1,
337 const struct in6_addr *a2)
339 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
340 a1->s6_addr32[1] == a2->s6_addr32[1] &&
341 a1->s6_addr32[2] == a2->s6_addr32[2] &&
342 a1->s6_addr32[3] == a2->s6_addr32[3]);
345 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
346 unsigned int prefixlen)
350 /* check complete u32 in prefix */
351 pdw = prefixlen >> 5;
352 if (pdw && memcmp(a1, a2, pdw << 2))
355 /* check incomplete u32 in prefix */
356 pbi = prefixlen & 0x1f;
357 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
363 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
364 const struct in6_addr *a2,
365 unsigned int prefixlen)
367 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
371 struct inet_frag_queue;
373 struct ip6_create_arg {
375 struct in6_addr *src;
376 struct in6_addr *dst;
379 void ip6_frag_init(struct inet_frag_queue *q, void *a);
380 int ip6_frag_match(struct inet_frag_queue *q, void *a);
382 static inline int ipv6_addr_any(const struct in6_addr *a)
384 return ((a->s6_addr32[0] | a->s6_addr32[1] |
385 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
388 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
390 return ((a->s6_addr32[0] | a->s6_addr32[1]) == 0 &&
391 a->s6_addr32[2] == htonl(0x0000ffff));
395 * find the first different bit between two addresses
396 * length of address must be a multiple of 32bits
398 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
400 const __be32 *a1 = token1, *a2 = token2;
405 for (i = 0; i < addrlen; i++) {
406 __be32 xb = a1[i] ^ a2[i];
408 return i * 32 + 32 - fls(ntohl(xb));
412 * we should *never* get to this point since that
413 * would mean the addrs are equal
415 * However, we do get to it 8) And exacly, when
416 * addresses are equal 8)
418 * ip route add 1111::/128 via ...
419 * ip route add 1111::/64 via ...
422 * Ideally, this function should stop comparison
423 * at prefix length. It does not, but it is still OK,
424 * if returned value is greater than prefix length.
427 return (addrlen << 5);
430 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
432 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
436 * Prototypes exported by ipv6
440 * rcv function (called from netdevice level)
443 extern int ipv6_rcv(struct sk_buff *skb,
444 struct net_device *dev,
445 struct packet_type *pt,
446 struct net_device *orig_dev);
448 extern int ip6_rcv_finish(struct sk_buff *skb);
451 * upper-layer output functions
453 extern int ip6_xmit(struct sock *sk,
456 struct ipv6_txoptions *opt,
459 extern int ip6_nd_hdr(struct sock *sk,
461 struct net_device *dev,
462 struct in6_addr *saddr,
463 struct in6_addr *daddr,
466 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
468 extern int ip6_append_data(struct sock *sk,
469 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
475 struct ipv6_txoptions *opt,
480 extern int ip6_push_pending_frames(struct sock *sk);
482 extern void ip6_flush_pending_frames(struct sock *sk);
484 extern int ip6_dst_lookup(struct sock *sk,
485 struct dst_entry **dst,
487 extern int ip6_dst_blackhole(struct sock *sk,
488 struct dst_entry **dst,
490 extern int ip6_sk_dst_lookup(struct sock *sk,
491 struct dst_entry **dst,
495 * skb processing functions
498 extern int ip6_output(struct sk_buff *skb);
499 extern int ip6_forward(struct sk_buff *skb);
500 extern int ip6_input(struct sk_buff *skb);
501 extern int ip6_mc_input(struct sk_buff *skb);
503 extern int __ip6_local_out(struct sk_buff *skb);
504 extern int ip6_local_out(struct sk_buff *skb);
507 * Extension header (options) processing
510 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
512 struct ipv6_txoptions *opt,
513 struct in6_addr *daddr,
515 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
517 struct ipv6_txoptions *opt);
518 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
519 struct ipv6_txoptions *opt,
521 struct in6_addr **daddr_p);
522 extern void ipv6_push_frag_opts(struct sk_buff *skb,
523 struct ipv6_txoptions *opt,
526 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
529 extern int ipv6_ext_hdr(u8 nexthdr);
531 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
534 * socket options (ipv6_sockglue.c)
537 extern int ipv6_setsockopt(struct sock *sk, int level,
541 extern int ipv6_getsockopt(struct sock *sk, int level,
545 extern int compat_ipv6_setsockopt(struct sock *sk,
550 extern int compat_ipv6_getsockopt(struct sock *sk,
556 extern void ipv6_packet_init(void);
558 extern void ipv6_packet_cleanup(void);
560 extern int ip6_datagram_connect(struct sock *sk,
561 struct sockaddr *addr, int addr_len);
563 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
564 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
565 u32 info, u8 *payload);
566 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
568 extern int inet6_release(struct socket *sock);
569 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
571 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
572 int *uaddr_len, int peer);
573 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
576 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
582 struct inet_frags_ctl;
583 extern struct inet_frags_ctl ip6_frags_ctl;
585 extern const struct proto_ops inet6_stream_ops;
586 extern const struct proto_ops inet6_dgram_ops;
588 struct group_source_req;
591 extern int ip6_mc_source(int add, int omode, struct sock *sk,
592 struct group_source_req *pgsr);
593 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
594 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
595 struct group_filter __user *optval,
598 #ifdef CONFIG_PROC_FS
599 extern int ac6_proc_init(void);
600 extern void ac6_proc_exit(void);
601 extern int raw6_proc_init(void);
602 extern void raw6_proc_exit(void);
603 extern int tcp6_proc_init(void);
604 extern void tcp6_proc_exit(void);
605 extern int udp6_proc_init(void);
606 extern void udp6_proc_exit(void);
607 extern int udplite6_proc_init(void);
608 extern void udplite6_proc_exit(void);
609 extern int ipv6_misc_proc_init(void);
610 extern void ipv6_misc_proc_exit(void);
611 extern int snmp6_register_dev(struct inet6_dev *idev);
612 extern int snmp6_unregister_dev(struct inet6_dev *idev);
614 extern struct rt6_statistics rt6_stats;
616 static inline int snmp6_register_dev(struct inet6_dev *idev)
621 static inline int snmp6_unregister_dev(struct inet6_dev *idev)
628 extern ctl_table ipv6_route_table[];
629 extern ctl_table ipv6_icmp_table[];
631 extern void ipv6_sysctl_register(void);
632 extern void ipv6_sysctl_unregister(void);
635 #endif /* __KERNEL__ */
636 #endif /* _NET_IPV6_H */