2 * Linux INET6 implementation
5 * Pedro Roque <roque@di.fc.ul.pt>
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.
16 #include <linux/ipv6.h>
17 #include <linux/hardirq.h>
18 #include <net/if_inet6.h>
19 #include <net/ndisc.h>
23 #define SIN6_LEN_RFC2133 24
25 #define IPV6_MAXPLEN 65535
28 * NextHeader field of IPv6 header
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. */
44 #define NEXTHDR_MAX 255
48 #define IPV6_DEFAULT_HOPLIMIT 64
49 #define IPV6_DEFAULT_MCASTHOPS 1
54 * type - unicast | multicast
55 * scope - local | site | global
62 #define IPV6_ADDR_ANY 0x0000U
64 #define IPV6_ADDR_UNICAST 0x0001U
65 #define IPV6_ADDR_MULTICAST 0x0002U
67 #define IPV6_ADDR_LOOPBACK 0x0010U
68 #define IPV6_ADDR_LINKLOCAL 0x0020U
69 #define IPV6_ADDR_SITELOCAL 0x0040U
71 #define IPV6_ADDR_COMPATv4 0x0080U
73 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
75 #define IPV6_ADDR_MAPPED 0x1000U
76 #define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */
82 #define IPV6_ADDR_MC_SCOPE(a) \
83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
84 #define __IPV6_ADDR_SCOPE_INVALID -1
86 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
87 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
88 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
89 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
90 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
93 * fragmentation header
100 __be32 identification;
103 #define IP6_MF 0x0001
107 #include <net/sock.h>
110 extern int sysctl_mld_max_msf;
111 extern struct ctl_path net_ipv6_ctl_path[];
113 #define _DEVINC(statname, modifier, idev, field) \
115 struct inet6_dev *_idev = (idev); \
116 if (likely(_idev != NULL)) \
117 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
118 SNMP_INC_STATS##modifier(statname##_statistics, (field)); \
121 #define _DEVADD(statname, modifier, idev, field, val) \
123 struct inet6_dev *_idev = (idev); \
124 if (likely(_idev != NULL)) \
125 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
126 SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\
130 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
132 #define IP6_INC_STATS(idev,field) _DEVINC(ipv6, , idev, field)
133 #define IP6_INC_STATS_BH(idev,field) _DEVINC(ipv6, _BH, idev, field)
134 #define IP6_INC_STATS_USER(idev,field) _DEVINC(ipv6, _USER, idev, field)
135 #define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val)
137 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
138 DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics);
140 #define ICMP6_INC_STATS(idev, field) _DEVINC(icmpv6, , idev, field)
141 #define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field)
142 #define ICMP6_INC_STATS_USER(idev, field) _DEVINC(icmpv6, _USER, idev, field)
144 #define ICMP6MSGOUT_INC_STATS(idev, field) \
145 _DEVINC(icmpv6msg, , idev, field +256)
146 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
147 _DEVINC(icmpv6msg, _BH, idev, field +256)
148 #define ICMP6MSGOUT_INC_STATS_USER(idev, field) \
149 _DEVINC(icmpv6msg, _USER, idev, field +256)
150 #define ICMP6MSGIN_INC_STATS(idev, field) \
151 _DEVINC(icmpv6msg, , idev, field)
152 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \
153 _DEVINC(icmpv6msg, _BH, idev, field)
154 #define ICMP6MSGIN_INC_STATS_USER(idev, field) \
155 _DEVINC(icmpv6msg, _USER, idev, field)
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;
197 struct ipv6_txoptions *opt;
198 unsigned long linger;
201 unsigned long lastuse;
202 unsigned long expires;
206 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
207 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
209 struct ipv6_fl_socklist
211 struct ipv6_fl_socklist *next;
212 struct ip6_flowlabel *fl;
215 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
216 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
217 struct ip6_flowlabel * fl,
218 struct ipv6_txoptions * fopt);
219 extern void fl6_free_socklist(struct sock *sk);
220 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
221 extern int ip6_flowlabel_init(void);
222 extern void ip6_flowlabel_cleanup(void);
224 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
227 atomic_dec(&fl->users);
230 extern int ip6_ra_control(struct sock *sk, int sel,
231 void (*destructor)(struct sock *));
234 extern int ipv6_parse_hopopts(struct sk_buff *skb);
236 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
237 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
239 struct ipv6_opt_hdr __user *newopt,
241 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
242 struct ipv6_txoptions *opt);
244 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
246 int ip6_frag_nqueues(struct net *net);
247 int ip6_frag_mem(struct net *net);
249 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
251 extern int __ipv6_addr_type(const struct in6_addr *addr);
252 static inline int ipv6_addr_type(const struct in6_addr *addr)
254 return __ipv6_addr_type(addr) & 0xffff;
257 static inline int ipv6_addr_scope(const struct in6_addr *addr)
259 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
262 static inline int __ipv6_addr_src_scope(int type)
264 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
267 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
269 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
272 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
274 return memcmp(a1, a2, sizeof(struct in6_addr));
278 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
279 const struct in6_addr *a2)
281 return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
282 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
283 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
284 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])));
287 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
289 memcpy(a1, a2, sizeof(struct in6_addr));
292 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
293 const struct in6_addr *addr,
296 /* caller must guarantee 0 <= plen <= 128 */
300 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
301 memcpy(pfx->s6_addr, addr, o);
303 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
306 static inline void ipv6_addr_set(struct in6_addr *addr,
307 __be32 w1, __be32 w2,
308 __be32 w3, __be32 w4)
310 addr->s6_addr32[0] = w1;
311 addr->s6_addr32[1] = w2;
312 addr->s6_addr32[2] = w3;
313 addr->s6_addr32[3] = w4;
316 static inline int ipv6_addr_equal(const struct in6_addr *a1,
317 const struct in6_addr *a2)
319 return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
320 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
321 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
322 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0);
325 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
326 unsigned int prefixlen)
330 /* check complete u32 in prefix */
331 pdw = prefixlen >> 5;
332 if (pdw && memcmp(a1, a2, pdw << 2))
335 /* check incomplete u32 in prefix */
336 pbi = prefixlen & 0x1f;
337 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
343 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
344 const struct in6_addr *a2,
345 unsigned int prefixlen)
347 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
351 struct inet_frag_queue;
353 struct ip6_create_arg {
355 struct in6_addr *src;
356 struct in6_addr *dst;
359 void ip6_frag_init(struct inet_frag_queue *q, void *a);
360 int ip6_frag_match(struct inet_frag_queue *q, void *a);
362 static inline int ipv6_addr_any(const struct in6_addr *a)
364 return ((a->s6_addr32[0] | a->s6_addr32[1] |
365 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
368 static inline int ipv6_addr_loopback(const struct in6_addr *a)
370 return ((a->s6_addr32[0] | a->s6_addr32[1] |
371 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0);
374 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
376 return ((a->s6_addr32[0] | a->s6_addr32[1] |
377 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
381 * Check for a RFC 4843 ORCHID address
382 * (Overlay Routable Cryptographic Hash Identifiers)
384 static inline int ipv6_addr_orchid(const struct in6_addr *a)
386 return ((a->s6_addr32[0] & htonl(0xfffffff0))
387 == htonl(0x20010010));
390 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
391 struct in6_addr *v4mapped)
393 ipv6_addr_set(v4mapped,
400 * find the first different bit between two addresses
401 * length of address must be a multiple of 32bits
403 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
405 const __be32 *a1 = token1, *a2 = token2;
410 for (i = 0; i < addrlen; i++) {
411 __be32 xb = a1[i] ^ a2[i];
413 return i * 32 + 32 - fls(ntohl(xb));
417 * we should *never* get to this point since that
418 * would mean the addrs are equal
420 * However, we do get to it 8) And exacly, when
421 * addresses are equal 8)
423 * ip route add 1111::/128 via ...
424 * ip route add 1111::/64 via ...
427 * Ideally, this function should stop comparison
428 * at prefix length. It does not, but it is still OK,
429 * if returned value is greater than prefix length.
432 return (addrlen << 5);
435 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
437 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
441 * Prototypes exported by ipv6
445 * rcv function (called from netdevice level)
448 extern int ipv6_rcv(struct sk_buff *skb,
449 struct net_device *dev,
450 struct packet_type *pt,
451 struct net_device *orig_dev);
453 extern int ip6_rcv_finish(struct sk_buff *skb);
456 * upper-layer output functions
458 extern int ip6_xmit(struct sock *sk,
461 struct ipv6_txoptions *opt,
464 extern int ip6_nd_hdr(struct sock *sk,
466 struct net_device *dev,
467 const struct in6_addr *saddr,
468 const struct in6_addr *daddr,
471 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
473 extern int ip6_append_data(struct sock *sk,
474 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
480 struct ipv6_txoptions *opt,
485 extern int ip6_push_pending_frames(struct sock *sk);
487 extern void ip6_flush_pending_frames(struct sock *sk);
489 extern int ip6_dst_lookup(struct sock *sk,
490 struct dst_entry **dst,
492 extern int ip6_dst_blackhole(struct sock *sk,
493 struct dst_entry **dst,
495 extern int ip6_sk_dst_lookup(struct sock *sk,
496 struct dst_entry **dst,
500 * skb processing functions
503 extern int ip6_output(struct sk_buff *skb);
504 extern int ip6_forward(struct sk_buff *skb);
505 extern int ip6_input(struct sk_buff *skb);
506 extern int ip6_mc_input(struct sk_buff *skb);
508 extern int __ip6_local_out(struct sk_buff *skb);
509 extern int ip6_local_out(struct sk_buff *skb);
512 * Extension header (options) processing
515 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
516 struct ipv6_txoptions *opt,
518 struct in6_addr **daddr_p);
519 extern void ipv6_push_frag_opts(struct sk_buff *skb,
520 struct ipv6_txoptions *opt,
523 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
526 extern int ipv6_ext_hdr(u8 nexthdr);
528 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
531 * socket options (ipv6_sockglue.c)
534 extern int ipv6_setsockopt(struct sock *sk, int level,
538 extern int ipv6_getsockopt(struct sock *sk, int level,
542 extern int compat_ipv6_setsockopt(struct sock *sk,
547 extern int compat_ipv6_getsockopt(struct sock *sk,
553 extern int ip6_datagram_connect(struct sock *sk,
554 struct sockaddr *addr, int addr_len);
556 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
557 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
558 u32 info, u8 *payload);
559 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
561 extern int inet6_release(struct socket *sock);
562 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
564 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
565 int *uaddr_len, int peer);
566 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
569 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
575 extern const struct proto_ops inet6_stream_ops;
576 extern const struct proto_ops inet6_dgram_ops;
578 struct group_source_req;
581 extern int ip6_mc_source(int add, int omode, struct sock *sk,
582 struct group_source_req *pgsr);
583 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
584 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
585 struct group_filter __user *optval,
588 #ifdef CONFIG_PROC_FS
589 extern int ac6_proc_init(struct net *net);
590 extern void ac6_proc_exit(struct net *net);
591 extern int raw6_proc_init(void);
592 extern void raw6_proc_exit(void);
593 extern int tcp6_proc_init(struct net *net);
594 extern void tcp6_proc_exit(struct net *net);
595 extern int udp6_proc_init(struct net *net);
596 extern void udp6_proc_exit(struct net *net);
597 extern int udplite6_proc_init(void);
598 extern void udplite6_proc_exit(void);
599 extern int ipv6_misc_proc_init(void);
600 extern void ipv6_misc_proc_exit(void);
601 extern int snmp6_register_dev(struct inet6_dev *idev);
602 extern int snmp6_unregister_dev(struct inet6_dev *idev);
605 static inline int ac6_proc_init(struct net *net) { return 0; }
606 static inline void ac6_proc_exit(struct net *net) { }
607 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
608 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
612 extern ctl_table ipv6_route_table_template[];
613 extern ctl_table ipv6_icmp_table_template[];
615 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
616 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
617 extern int ipv6_sysctl_register(void);
618 extern void ipv6_sysctl_unregister(void);
621 #endif /* __KERNEL__ */
622 #endif /* _NET_IPV6_H */