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/ndisc.h>
24 #define SIN6_LEN_RFC2133 24
26 #define IPV6_MAXPLEN 65535
29 * NextHeader field of IPv6 header
32 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
33 #define NEXTHDR_TCP 6 /* TCP segment. */
34 #define NEXTHDR_UDP 17 /* UDP message. */
35 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
36 #define NEXTHDR_ROUTING 43 /* Routing header. */
37 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
38 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
39 #define NEXTHDR_AUTH 51 /* Authentication header. */
40 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
41 #define NEXTHDR_NONE 59 /* No next header */
42 #define NEXTHDR_DEST 60 /* Destination options header. */
43 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
45 #define NEXTHDR_MAX 255
49 #define IPV6_DEFAULT_HOPLIMIT 64
50 #define IPV6_DEFAULT_MCASTHOPS 1
55 * type - unicast | multicast
56 * scope - local | site | global
63 #define IPV6_ADDR_ANY 0x0000U
65 #define IPV6_ADDR_UNICAST 0x0001U
66 #define IPV6_ADDR_MULTICAST 0x0002U
68 #define IPV6_ADDR_LOOPBACK 0x0010U
69 #define IPV6_ADDR_LINKLOCAL 0x0020U
70 #define IPV6_ADDR_SITELOCAL 0x0040U
72 #define IPV6_ADDR_COMPATv4 0x0080U
74 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
76 #define IPV6_ADDR_MAPPED 0x1000U
77 #define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */
83 #define IPV6_ADDR_MC_SCOPE(a) \
84 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
85 #define __IPV6_ADDR_SCOPE_INVALID -1
87 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
88 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
89 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
90 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
91 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
94 * fragmentation header
98 unsigned char nexthdr;
99 unsigned char reserved;
100 unsigned short frag_off;
101 __u32 identification;
104 #define IP6_MF 0x0001
108 #include <net/sock.h>
111 extern int sysctl_ipv6_bindv6only;
112 extern int sysctl_mld_max_msf;
115 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
116 #define IP6_INC_STATS(field) SNMP_INC_STATS(ipv6_statistics, field)
117 #define IP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(ipv6_statistics, field)
118 #define IP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(ipv6_statistics, field)
119 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
120 #define ICMP6_INC_STATS(idev, field) ({ \
121 struct inet6_dev *_idev = (idev); \
122 if (likely(_idev != NULL)) \
123 SNMP_INC_STATS(idev->stats.icmpv6, field); \
124 SNMP_INC_STATS(icmpv6_statistics, field); \
126 #define ICMP6_INC_STATS_BH(idev, field) ({ \
127 struct inet6_dev *_idev = (idev); \
128 if (likely(_idev != NULL)) \
129 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \
130 SNMP_INC_STATS_BH(icmpv6_statistics, field); \
132 #define ICMP6_INC_STATS_USER(idev, field) ({ \
133 struct inet6_dev *_idev = (idev); \
134 if (likely(_idev != NULL)) \
135 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \
136 SNMP_INC_STATS_USER(icmpv6_statistics, field); \
138 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \
139 struct inet6_dev *_idev = idev; \
140 __typeof__(offset) _offset = (offset); \
141 if (likely(_idev != NULL)) \
142 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \
143 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \
145 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
146 #define UDP6_INC_STATS(field) SNMP_INC_STATS(udp_stats_in6, field)
147 #define UDP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_stats_in6, field)
148 #define UDP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(udp_stats_in6, field)
150 int snmp6_register_dev(struct inet6_dev *idev);
151 int snmp6_unregister_dev(struct inet6_dev *idev);
152 int snmp6_alloc_dev(struct inet6_dev *idev);
153 int snmp6_free_dev(struct inet6_dev *idev);
154 int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
155 void snmp6_mib_free(void *ptr[2]);
159 struct ip6_ra_chain *next;
162 void (*destructor)(struct sock *);
165 extern struct ip6_ra_chain *ip6_ra_chain;
166 extern rwlock_t ip6_ra_lock;
169 This structure is prepared by protocol, when parsing
170 ancillary data and passed to IPv6.
173 struct ipv6_txoptions
175 /* Length of this structure */
178 /* length of extension headers */
180 __u16 opt_flen; /* after fragment hdr */
181 __u16 opt_nflen; /* before fragment hdr */
183 struct ipv6_opt_hdr *hopopt;
184 struct ipv6_opt_hdr *dst0opt;
185 struct ipv6_rt_hdr *srcrt; /* Routing Header */
186 struct ipv6_opt_hdr *dst1opt;
188 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
193 struct ip6_flowlabel *next;
196 struct ipv6_txoptions *opt;
198 unsigned long linger;
201 unsigned long lastuse;
202 unsigned long expires;
205 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
206 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
208 struct ipv6_fl_socklist
210 struct ipv6_fl_socklist *next;
211 struct ip6_flowlabel *fl;
214 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, u32 label);
215 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
216 struct ip6_flowlabel * fl,
217 struct ipv6_txoptions * fopt);
218 extern void fl6_free_socklist(struct sock *sk);
219 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
220 extern void ip6_flowlabel_init(void);
221 extern void ip6_flowlabel_cleanup(void);
223 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
226 atomic_dec(&fl->users);
229 extern int ip6_ra_control(struct sock *sk, int sel,
230 void (*destructor)(struct sock *));
233 extern int ipv6_parse_hopopts(struct sk_buff **skbp);
235 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
236 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
238 struct ipv6_opt_hdr __user *newopt,
240 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
241 struct ipv6_txoptions *opt);
243 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
245 extern int ip6_frag_nqueues;
246 extern atomic_t ip6_frag_mem;
248 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
251 * Function prototype for build_xmit
254 typedef int (*inet_getfrag_t) (const void *data,
255 struct in6_addr *addr,
257 unsigned int, unsigned int);
259 extern int __ipv6_addr_type(const struct in6_addr *addr);
260 static inline int ipv6_addr_type(const struct in6_addr *addr)
262 return __ipv6_addr_type(addr) & 0xffff;
265 static inline int ipv6_addr_scope(const struct in6_addr *addr)
267 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
270 static inline int __ipv6_addr_src_scope(int type)
272 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
275 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
277 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
280 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
282 return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr));
286 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
287 const struct in6_addr *a2)
291 for (i = 0; i < 4; i++)
292 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
297 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
299 memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr));
302 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
303 const struct in6_addr *addr,
306 /* caller must guarantee 0 <= plen <= 128 */
310 memcpy(pfx->s6_addr, addr, o);
312 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
316 memset(pfx->s6_addr + o, 0, 16 - o);
319 #ifndef __HAVE_ARCH_ADDR_SET
320 static inline void ipv6_addr_set(struct in6_addr *addr,
321 __be32 w1, __be32 w2,
322 __be32 w3, __be32 w4)
324 addr->s6_addr32[0] = w1;
325 addr->s6_addr32[1] = w2;
326 addr->s6_addr32[2] = w3;
327 addr->s6_addr32[3] = w4;
331 static inline int ipv6_addr_equal(const struct in6_addr *a1,
332 const struct in6_addr *a2)
334 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
335 a1->s6_addr32[1] == a2->s6_addr32[1] &&
336 a1->s6_addr32[2] == a2->s6_addr32[2] &&
337 a1->s6_addr32[3] == a2->s6_addr32[3]);
340 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
341 unsigned int prefixlen)
345 /* check complete u32 in prefix */
346 pdw = prefixlen >> 5;
347 if (pdw && memcmp(a1, a2, pdw << 2))
350 /* check incomplete u32 in prefix */
351 pbi = prefixlen & 0x1f;
352 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
358 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
359 const struct in6_addr *a2,
360 unsigned int prefixlen)
362 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
366 static inline int ipv6_addr_any(const struct in6_addr *a)
368 return ((a->s6_addr32[0] | a->s6_addr32[1] |
369 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
373 * find the first different bit between two addresses
374 * length of address must be a multiple of 32bits
376 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
378 const __u32 *a1 = token1, *a2 = token2;
383 for (i = 0; i < addrlen; i++) {
384 __u32 xb = a1[i] ^ a2[i];
389 while ((xb & (1 << j)) == 0)
392 return (i * 32 + 31 - j);
397 * we should *never* get to this point since that
398 * would mean the addrs are equal
400 * However, we do get to it 8) And exacly, when
401 * addresses are equal 8)
403 * ip route add 1111::/128 via ...
404 * ip route add 1111::/64 via ...
407 * Ideally, this function should stop comparison
408 * at prefix length. It does not, but it is still OK,
409 * if returned value is greater than prefix length.
412 return (addrlen << 5);
415 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
417 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
421 * Prototypes exported by ipv6
425 * rcv function (called from netdevice level)
428 extern int ipv6_rcv(struct sk_buff *skb,
429 struct net_device *dev,
430 struct packet_type *pt,
431 struct net_device *orig_dev);
433 extern int ip6_rcv_finish(struct sk_buff *skb);
436 * upper-layer output functions
438 extern int ip6_xmit(struct sock *sk,
441 struct ipv6_txoptions *opt,
444 extern int ip6_nd_hdr(struct sock *sk,
446 struct net_device *dev,
447 struct in6_addr *saddr,
448 struct in6_addr *daddr,
451 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
453 extern int ip6_append_data(struct sock *sk,
454 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
460 struct ipv6_txoptions *opt,
465 extern int ip6_push_pending_frames(struct sock *sk);
467 extern void ip6_flush_pending_frames(struct sock *sk);
469 extern int ip6_dst_lookup(struct sock *sk,
470 struct dst_entry **dst,
472 extern int ip6_sk_dst_lookup(struct sock *sk,
473 struct dst_entry **dst,
477 * skb processing functions
480 extern int ip6_output(struct sk_buff *skb);
481 extern int ip6_forward(struct sk_buff *skb);
482 extern int ip6_input(struct sk_buff *skb);
483 extern int ip6_mc_input(struct sk_buff *skb);
486 * Extension header (options) processing
489 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
491 struct ipv6_txoptions *opt,
492 struct in6_addr *daddr,
494 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
496 struct ipv6_txoptions *opt);
497 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
498 struct ipv6_txoptions *opt,
500 struct in6_addr **daddr_p);
501 extern void ipv6_push_frag_opts(struct sk_buff *skb,
502 struct ipv6_txoptions *opt,
505 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
508 extern int ipv6_ext_hdr(u8 nexthdr);
510 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
512 extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
513 struct ipv6_rt_hdr *hdr);
517 * socket options (ipv6_sockglue.c)
520 extern int ipv6_setsockopt(struct sock *sk, int level,
524 extern int ipv6_getsockopt(struct sock *sk, int level,
528 extern int compat_ipv6_setsockopt(struct sock *sk,
533 extern int compat_ipv6_getsockopt(struct sock *sk,
539 extern void ipv6_packet_init(void);
541 extern void ipv6_packet_cleanup(void);
543 extern int ip6_datagram_connect(struct sock *sk,
544 struct sockaddr *addr, int addr_len);
546 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
547 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
548 u32 info, u8 *payload);
549 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
551 extern int inet6_release(struct socket *sock);
552 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
554 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
555 int *uaddr_len, int peer);
556 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
559 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
565 extern int sysctl_ip6frag_high_thresh;
566 extern int sysctl_ip6frag_low_thresh;
567 extern int sysctl_ip6frag_time;
568 extern int sysctl_ip6frag_secret_interval;
570 extern const struct proto_ops inet6_stream_ops;
571 extern const struct proto_ops inet6_dgram_ops;
573 struct group_source_req;
576 extern int ip6_mc_source(int add, int omode, struct sock *sk,
577 struct group_source_req *pgsr);
578 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
579 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
580 struct group_filter __user *optval,
583 #ifdef CONFIG_PROC_FS
584 extern int ac6_proc_init(void);
585 extern void ac6_proc_exit(void);
586 extern int raw6_proc_init(void);
587 extern void raw6_proc_exit(void);
588 extern int tcp6_proc_init(void);
589 extern void tcp6_proc_exit(void);
590 extern int udp6_proc_init(void);
591 extern void udp6_proc_exit(void);
592 extern int ipv6_misc_proc_init(void);
593 extern void ipv6_misc_proc_exit(void);
595 extern struct rt6_statistics rt6_stats;
599 extern ctl_table ipv6_route_table[];
600 extern ctl_table ipv6_icmp_table[];
602 extern void ipv6_sysctl_register(void);
603 extern void ipv6_sysctl_unregister(void);
606 #endif /* __KERNEL__ */
607 #endif /* _NET_IPV6_H */