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
101 __be32 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(idev,field) ({ \
117 struct inet6_dev *_idev = (idev); \
118 if (likely(_idev != NULL)) \
119 SNMP_INC_STATS(_idev->stats.ipv6, field); \
120 SNMP_INC_STATS(ipv6_statistics, field); \
122 #define IP6_INC_STATS_BH(idev,field) ({ \
123 struct inet6_dev *_idev = (idev); \
124 if (likely(_idev != NULL)) \
125 SNMP_INC_STATS_BH(_idev->stats.ipv6, field); \
126 SNMP_INC_STATS_BH(ipv6_statistics, field); \
128 #define IP6_INC_STATS_USER(idev,field) ({ \
129 struct inet6_dev *_idev = (idev); \
130 if (likely(_idev != NULL)) \
131 SNMP_INC_STATS_USER(_idev->stats.ipv6, field); \
132 SNMP_INC_STATS_USER(ipv6_statistics, field); \
134 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
135 #define ICMP6_INC_STATS(idev, field) ({ \
136 struct inet6_dev *_idev = (idev); \
137 if (likely(_idev != NULL)) \
138 SNMP_INC_STATS(idev->stats.icmpv6, field); \
139 SNMP_INC_STATS(icmpv6_statistics, field); \
141 #define ICMP6_INC_STATS_BH(idev, field) ({ \
142 struct inet6_dev *_idev = (idev); \
143 if (likely(_idev != NULL)) \
144 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \
145 SNMP_INC_STATS_BH(icmpv6_statistics, field); \
147 #define ICMP6_INC_STATS_USER(idev, field) ({ \
148 struct inet6_dev *_idev = (idev); \
149 if (likely(_idev != NULL)) \
150 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \
151 SNMP_INC_STATS_USER(icmpv6_statistics, field); \
153 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \
154 struct inet6_dev *_idev = idev; \
155 __typeof__(offset) _offset = (offset); \
156 if (likely(_idev != NULL)) \
157 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \
158 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \
160 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
161 DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6);
162 #define UDP6_INC_STATS_BH(field, is_udplite) do { \
163 if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field); \
164 else SNMP_INC_STATS_BH(udp_stats_in6, field); } while(0)
165 #define UDP6_INC_STATS_USER(field, is_udplite) do { \
166 if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field); \
167 else SNMP_INC_STATS_USER(udp_stats_in6, field); } while(0)
169 int snmp6_register_dev(struct inet6_dev *idev);
170 int snmp6_unregister_dev(struct inet6_dev *idev);
171 int snmp6_alloc_dev(struct inet6_dev *idev);
172 int snmp6_free_dev(struct inet6_dev *idev);
173 int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
174 void snmp6_mib_free(void *ptr[2]);
175 void snmp6_fill_stats(void *stats, struct inet6_dev *idev, int attrtype, int bytes);
179 struct ip6_ra_chain *next;
182 void (*destructor)(struct sock *);
185 extern struct ip6_ra_chain *ip6_ra_chain;
186 extern rwlock_t ip6_ra_lock;
189 This structure is prepared by protocol, when parsing
190 ancillary data and passed to IPv6.
193 struct ipv6_txoptions
195 /* Length of this structure */
198 /* length of extension headers */
200 __u16 opt_flen; /* after fragment hdr */
201 __u16 opt_nflen; /* before fragment hdr */
203 struct ipv6_opt_hdr *hopopt;
204 struct ipv6_opt_hdr *dst0opt;
205 struct ipv6_rt_hdr *srcrt; /* Routing Header */
206 struct ipv6_opt_hdr *dst1opt;
208 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
213 struct ip6_flowlabel *next;
216 struct ipv6_txoptions *opt;
218 unsigned long linger;
221 unsigned long lastuse;
222 unsigned long expires;
225 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
226 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
228 struct ipv6_fl_socklist
230 struct ipv6_fl_socklist *next;
231 struct ip6_flowlabel *fl;
234 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
235 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
236 struct ip6_flowlabel * fl,
237 struct ipv6_txoptions * fopt);
238 extern void fl6_free_socklist(struct sock *sk);
239 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
240 extern void ip6_flowlabel_init(void);
241 extern void ip6_flowlabel_cleanup(void);
243 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
246 atomic_dec(&fl->users);
249 extern int ip6_ra_control(struct sock *sk, int sel,
250 void (*destructor)(struct sock *));
253 extern int ipv6_parse_hopopts(struct sk_buff **skbp);
255 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
256 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
258 struct ipv6_opt_hdr __user *newopt,
260 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
261 struct ipv6_txoptions *opt);
263 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
265 extern int ip6_frag_nqueues;
266 extern atomic_t ip6_frag_mem;
268 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
271 * Function prototype for build_xmit
274 typedef int (*inet_getfrag_t) (const void *data,
275 struct in6_addr *addr,
277 unsigned int, unsigned int);
279 extern int __ipv6_addr_type(const struct in6_addr *addr);
280 static inline int ipv6_addr_type(const struct in6_addr *addr)
282 return __ipv6_addr_type(addr) & 0xffff;
285 static inline int ipv6_addr_scope(const struct in6_addr *addr)
287 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
290 static inline int __ipv6_addr_src_scope(int type)
292 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
295 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
297 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
300 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
302 return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr));
306 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
307 const struct in6_addr *a2)
311 for (i = 0; i < 4; i++)
312 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
317 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
319 memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr));
322 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
323 const struct in6_addr *addr,
326 /* caller must guarantee 0 <= plen <= 128 */
330 memcpy(pfx->s6_addr, addr, o);
332 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
336 memset(pfx->s6_addr + o, 0, 16 - o);
339 #ifndef __HAVE_ARCH_ADDR_SET
340 static inline void ipv6_addr_set(struct in6_addr *addr,
341 __be32 w1, __be32 w2,
342 __be32 w3, __be32 w4)
344 addr->s6_addr32[0] = w1;
345 addr->s6_addr32[1] = w2;
346 addr->s6_addr32[2] = w3;
347 addr->s6_addr32[3] = w4;
351 static inline int ipv6_addr_equal(const struct in6_addr *a1,
352 const struct in6_addr *a2)
354 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
355 a1->s6_addr32[1] == a2->s6_addr32[1] &&
356 a1->s6_addr32[2] == a2->s6_addr32[2] &&
357 a1->s6_addr32[3] == a2->s6_addr32[3]);
360 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
361 unsigned int prefixlen)
365 /* check complete u32 in prefix */
366 pdw = prefixlen >> 5;
367 if (pdw && memcmp(a1, a2, pdw << 2))
370 /* check incomplete u32 in prefix */
371 pbi = prefixlen & 0x1f;
372 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
378 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
379 const struct in6_addr *a2,
380 unsigned int prefixlen)
382 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
386 static inline int ipv6_addr_any(const struct in6_addr *a)
388 return ((a->s6_addr32[0] | a->s6_addr32[1] |
389 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
393 * find the first different bit between two addresses
394 * length of address must be a multiple of 32bits
396 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
398 const __be32 *a1 = token1, *a2 = token2;
403 for (i = 0; i < addrlen; i++) {
404 __be32 xb = a1[i] ^ a2[i];
406 return i * 32 + 32 - fls(ntohl(xb));
410 * we should *never* get to this point since that
411 * would mean the addrs are equal
413 * However, we do get to it 8) And exacly, when
414 * addresses are equal 8)
416 * ip route add 1111::/128 via ...
417 * ip route add 1111::/64 via ...
420 * Ideally, this function should stop comparison
421 * at prefix length. It does not, but it is still OK,
422 * if returned value is greater than prefix length.
425 return (addrlen << 5);
428 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
430 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
434 * Prototypes exported by ipv6
438 * rcv function (called from netdevice level)
441 extern int ipv6_rcv(struct sk_buff *skb,
442 struct net_device *dev,
443 struct packet_type *pt,
444 struct net_device *orig_dev);
446 extern int ip6_rcv_finish(struct sk_buff *skb);
449 * upper-layer output functions
451 extern int ip6_xmit(struct sock *sk,
454 struct ipv6_txoptions *opt,
457 extern int ip6_nd_hdr(struct sock *sk,
459 struct net_device *dev,
460 struct in6_addr *saddr,
461 struct in6_addr *daddr,
464 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
466 extern int ip6_append_data(struct sock *sk,
467 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
473 struct ipv6_txoptions *opt,
478 extern int ip6_push_pending_frames(struct sock *sk);
480 extern void ip6_flush_pending_frames(struct sock *sk);
482 extern int ip6_dst_lookup(struct sock *sk,
483 struct dst_entry **dst,
485 extern int ip6_sk_dst_lookup(struct sock *sk,
486 struct dst_entry **dst,
490 * skb processing functions
493 extern int ip6_output(struct sk_buff *skb);
494 extern int ip6_forward(struct sk_buff *skb);
495 extern int ip6_input(struct sk_buff *skb);
496 extern int ip6_mc_input(struct sk_buff *skb);
499 * Extension header (options) processing
502 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
504 struct ipv6_txoptions *opt,
505 struct in6_addr *daddr,
507 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
509 struct ipv6_txoptions *opt);
510 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
511 struct ipv6_txoptions *opt,
513 struct in6_addr **daddr_p);
514 extern void ipv6_push_frag_opts(struct sk_buff *skb,
515 struct ipv6_txoptions *opt,
518 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
521 extern int ipv6_ext_hdr(u8 nexthdr);
523 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
525 extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
526 struct ipv6_rt_hdr *hdr);
530 * socket options (ipv6_sockglue.c)
533 extern int ipv6_setsockopt(struct sock *sk, int level,
537 extern int ipv6_getsockopt(struct sock *sk, int level,
541 extern int compat_ipv6_setsockopt(struct sock *sk,
546 extern int compat_ipv6_getsockopt(struct sock *sk,
552 extern void ipv6_packet_init(void);
554 extern void ipv6_packet_cleanup(void);
556 extern int ip6_datagram_connect(struct sock *sk,
557 struct sockaddr *addr, int addr_len);
559 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
560 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
561 u32 info, u8 *payload);
562 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
564 extern int inet6_release(struct socket *sock);
565 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
567 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
568 int *uaddr_len, int peer);
569 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
572 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
578 extern int sysctl_ip6frag_high_thresh;
579 extern int sysctl_ip6frag_low_thresh;
580 extern int sysctl_ip6frag_time;
581 extern int sysctl_ip6frag_secret_interval;
583 extern const struct proto_ops inet6_stream_ops;
584 extern const struct proto_ops inet6_dgram_ops;
586 struct group_source_req;
589 extern int ip6_mc_source(int add, int omode, struct sock *sk,
590 struct group_source_req *pgsr);
591 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
592 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
593 struct group_filter __user *optval,
596 #ifdef CONFIG_PROC_FS
597 extern int ac6_proc_init(void);
598 extern void ac6_proc_exit(void);
599 extern int raw6_proc_init(void);
600 extern void raw6_proc_exit(void);
601 extern int tcp6_proc_init(void);
602 extern void tcp6_proc_exit(void);
603 extern int udp6_proc_init(void);
604 extern void udp6_proc_exit(void);
605 extern int udplite6_proc_init(void);
606 extern void udplite6_proc_exit(void);
607 extern int ipv6_misc_proc_init(void);
608 extern void ipv6_misc_proc_exit(void);
610 extern struct rt6_statistics rt6_stats;
614 extern ctl_table ipv6_route_table[];
615 extern ctl_table ipv6_icmp_table[];
617 extern void ipv6_sysctl_register(void);
618 extern void ipv6_sysctl_unregister(void);
621 #endif /* __KERNEL__ */
622 #endif /* _NET_IPV6_H */