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(net, idev,field) ({ (void)(net); \
133 _DEVINC(ipv6, , idev, field); })
134 #define IP6_INC_STATS_BH(net, idev,field) ({ (void)(net); \
135 _DEVINC(ipv6, _BH, idev, field); })
136 #define IP6_ADD_STATS_BH(net, idev,field,val) ({ (void)(net); \
137 _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(net, idev, field) ({ (void)(net); \
143 _DEVINC(icmpv6, , idev, field); })
144 #define ICMP6_INC_STATS_BH(net, idev, field) ({ (void)(net); \
145 _DEVINC(icmpv6, _BH, idev, field); })
147 #define ICMP6MSGOUT_INC_STATS(net, idev, field) ({ (void)(net); \
148 _DEVINC(icmpv6msg, , idev, field +256); })
149 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) ({ (void)(net); \
150 _DEVINC(icmpv6msg, _BH, idev, field +256); })
151 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \
152 _DEVINC(icmpv6msg, _BH, idev, field)
156 struct ip6_ra_chain *next;
159 void (*destructor)(struct sock *);
162 extern struct ip6_ra_chain *ip6_ra_chain;
163 extern rwlock_t ip6_ra_lock;
166 This structure is prepared by protocol, when parsing
167 ancillary data and passed to IPv6.
170 struct ipv6_txoptions
172 /* Length of this structure */
175 /* length of extension headers */
177 __u16 opt_flen; /* after fragment hdr */
178 __u16 opt_nflen; /* before fragment hdr */
180 struct ipv6_opt_hdr *hopopt;
181 struct ipv6_opt_hdr *dst0opt;
182 struct ipv6_rt_hdr *srcrt; /* Routing Header */
183 struct ipv6_opt_hdr *dst1opt;
185 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
190 struct ip6_flowlabel *next;
194 struct ipv6_txoptions *opt;
195 unsigned long linger;
198 unsigned long lastuse;
199 unsigned long expires;
203 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
204 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
206 struct ipv6_fl_socklist
208 struct ipv6_fl_socklist *next;
209 struct ip6_flowlabel *fl;
212 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
213 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
214 struct ip6_flowlabel * fl,
215 struct ipv6_txoptions * fopt);
216 extern void fl6_free_socklist(struct sock *sk);
217 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
218 extern int ip6_flowlabel_init(void);
219 extern void ip6_flowlabel_cleanup(void);
221 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
224 atomic_dec(&fl->users);
227 extern int ip6_ra_control(struct sock *sk, int sel);
229 extern int ipv6_parse_hopopts(struct sk_buff *skb);
231 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
232 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
234 struct ipv6_opt_hdr __user *newopt,
236 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
237 struct ipv6_txoptions *opt);
239 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
241 int ip6_frag_nqueues(struct net *net);
242 int ip6_frag_mem(struct net *net);
244 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
246 extern int __ipv6_addr_type(const struct in6_addr *addr);
247 static inline int ipv6_addr_type(const struct in6_addr *addr)
249 return __ipv6_addr_type(addr) & 0xffff;
252 static inline int ipv6_addr_scope(const struct in6_addr *addr)
254 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
257 static inline int __ipv6_addr_src_scope(int type)
259 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
262 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
264 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
267 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
269 return memcmp(a1, a2, sizeof(struct in6_addr));
273 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
274 const struct in6_addr *a2)
276 return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
277 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
278 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
279 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])));
282 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
284 memcpy(a1, a2, sizeof(struct in6_addr));
287 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
288 const struct in6_addr *addr,
291 /* caller must guarantee 0 <= plen <= 128 */
295 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
296 memcpy(pfx->s6_addr, addr, o);
298 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
301 static inline void ipv6_addr_set(struct in6_addr *addr,
302 __be32 w1, __be32 w2,
303 __be32 w3, __be32 w4)
305 addr->s6_addr32[0] = w1;
306 addr->s6_addr32[1] = w2;
307 addr->s6_addr32[2] = w3;
308 addr->s6_addr32[3] = w4;
311 static inline int ipv6_addr_equal(const struct in6_addr *a1,
312 const struct in6_addr *a2)
314 return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
315 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
316 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
317 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0);
320 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
321 unsigned int prefixlen)
325 /* check complete u32 in prefix */
326 pdw = prefixlen >> 5;
327 if (pdw && memcmp(a1, a2, pdw << 2))
330 /* check incomplete u32 in prefix */
331 pbi = prefixlen & 0x1f;
332 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
338 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
339 const struct in6_addr *a2,
340 unsigned int prefixlen)
342 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
346 struct inet_frag_queue;
348 struct ip6_create_arg {
350 struct in6_addr *src;
351 struct in6_addr *dst;
354 void ip6_frag_init(struct inet_frag_queue *q, void *a);
355 int ip6_frag_match(struct inet_frag_queue *q, void *a);
357 static inline int ipv6_addr_any(const struct in6_addr *a)
359 return ((a->s6_addr32[0] | a->s6_addr32[1] |
360 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
363 static inline int ipv6_addr_loopback(const struct in6_addr *a)
365 return ((a->s6_addr32[0] | a->s6_addr32[1] |
366 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0);
369 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
371 return ((a->s6_addr32[0] | a->s6_addr32[1] |
372 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
376 * Check for a RFC 4843 ORCHID address
377 * (Overlay Routable Cryptographic Hash Identifiers)
379 static inline int ipv6_addr_orchid(const struct in6_addr *a)
381 return ((a->s6_addr32[0] & htonl(0xfffffff0))
382 == htonl(0x20010010));
385 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
386 struct in6_addr *v4mapped)
388 ipv6_addr_set(v4mapped,
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 const struct in6_addr *saddr,
463 const 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 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);
526 * socket options (ipv6_sockglue.c)
529 extern int ipv6_setsockopt(struct sock *sk, int level,
533 extern int ipv6_getsockopt(struct sock *sk, int level,
537 extern int compat_ipv6_setsockopt(struct sock *sk,
542 extern int compat_ipv6_getsockopt(struct sock *sk,
548 extern int ip6_datagram_connect(struct sock *sk,
549 struct sockaddr *addr, int addr_len);
551 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
552 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
553 u32 info, u8 *payload);
554 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
556 extern int inet6_release(struct socket *sock);
557 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
559 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
560 int *uaddr_len, int peer);
561 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
564 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
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,
582 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
583 const struct in6_addr *daddr, u32 rnd);
585 #ifdef CONFIG_PROC_FS
586 extern int ac6_proc_init(struct net *net);
587 extern void ac6_proc_exit(struct net *net);
588 extern int raw6_proc_init(void);
589 extern void raw6_proc_exit(void);
590 extern int tcp6_proc_init(struct net *net);
591 extern void tcp6_proc_exit(struct net *net);
592 extern int udp6_proc_init(struct net *net);
593 extern void udp6_proc_exit(struct net *net);
594 extern int udplite6_proc_init(void);
595 extern void udplite6_proc_exit(void);
596 extern int ipv6_misc_proc_init(void);
597 extern void ipv6_misc_proc_exit(void);
598 extern int snmp6_register_dev(struct inet6_dev *idev);
599 extern int snmp6_unregister_dev(struct inet6_dev *idev);
602 static inline int ac6_proc_init(struct net *net) { return 0; }
603 static inline void ac6_proc_exit(struct net *net) { }
604 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
605 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
609 extern ctl_table ipv6_route_table_template[];
610 extern ctl_table ipv6_icmp_table_template[];
612 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
613 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
614 extern int ipv6_sysctl_register(void);
615 extern void ipv6_sysctl_unregister(void);
616 extern int ipv6_static_sysctl_register(void);
617 extern void ipv6_static_sysctl_unregister(void);
620 #endif /* __KERNEL__ */
621 #endif /* _NET_IPV6_H */