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(idev, field) \
150 _DEVINC(icmpv6msg, _BH, idev, field +256)
151 #define ICMP6MSGIN_INC_STATS(idev, field) \
152 _DEVINC(icmpv6msg, , idev, field)
153 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \
154 _DEVINC(icmpv6msg, _BH, idev, field)
158 struct ip6_ra_chain *next;
161 void (*destructor)(struct sock *);
164 extern struct ip6_ra_chain *ip6_ra_chain;
165 extern rwlock_t ip6_ra_lock;
168 This structure is prepared by protocol, when parsing
169 ancillary data and passed to IPv6.
172 struct ipv6_txoptions
174 /* Length of this structure */
177 /* length of extension headers */
179 __u16 opt_flen; /* after fragment hdr */
180 __u16 opt_nflen; /* before fragment hdr */
182 struct ipv6_opt_hdr *hopopt;
183 struct ipv6_opt_hdr *dst0opt;
184 struct ipv6_rt_hdr *srcrt; /* Routing Header */
185 struct ipv6_opt_hdr *dst1opt;
187 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
192 struct ip6_flowlabel *next;
196 struct ipv6_txoptions *opt;
197 unsigned long linger;
200 unsigned long lastuse;
201 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, __be32 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 int 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);
231 extern int ipv6_parse_hopopts(struct sk_buff *skb);
233 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
234 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
236 struct ipv6_opt_hdr __user *newopt,
238 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
239 struct ipv6_txoptions *opt);
241 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
243 int ip6_frag_nqueues(struct net *net);
244 int ip6_frag_mem(struct net *net);
246 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
248 extern int __ipv6_addr_type(const struct in6_addr *addr);
249 static inline int ipv6_addr_type(const struct in6_addr *addr)
251 return __ipv6_addr_type(addr) & 0xffff;
254 static inline int ipv6_addr_scope(const struct in6_addr *addr)
256 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
259 static inline int __ipv6_addr_src_scope(int type)
261 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
264 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
266 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
269 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
271 return memcmp(a1, a2, sizeof(struct in6_addr));
275 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
276 const struct in6_addr *a2)
278 return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
279 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
280 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
281 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])));
284 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
286 memcpy(a1, a2, sizeof(struct in6_addr));
289 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
290 const struct in6_addr *addr,
293 /* caller must guarantee 0 <= plen <= 128 */
297 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
298 memcpy(pfx->s6_addr, addr, o);
300 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
303 static inline void ipv6_addr_set(struct in6_addr *addr,
304 __be32 w1, __be32 w2,
305 __be32 w3, __be32 w4)
307 addr->s6_addr32[0] = w1;
308 addr->s6_addr32[1] = w2;
309 addr->s6_addr32[2] = w3;
310 addr->s6_addr32[3] = w4;
313 static inline int ipv6_addr_equal(const struct in6_addr *a1,
314 const struct in6_addr *a2)
316 return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
317 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
318 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
319 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0);
322 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
323 unsigned int prefixlen)
327 /* check complete u32 in prefix */
328 pdw = prefixlen >> 5;
329 if (pdw && memcmp(a1, a2, pdw << 2))
332 /* check incomplete u32 in prefix */
333 pbi = prefixlen & 0x1f;
334 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
340 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
341 const struct in6_addr *a2,
342 unsigned int prefixlen)
344 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
348 struct inet_frag_queue;
350 struct ip6_create_arg {
352 struct in6_addr *src;
353 struct in6_addr *dst;
356 void ip6_frag_init(struct inet_frag_queue *q, void *a);
357 int ip6_frag_match(struct inet_frag_queue *q, void *a);
359 static inline int ipv6_addr_any(const struct in6_addr *a)
361 return ((a->s6_addr32[0] | a->s6_addr32[1] |
362 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
365 static inline int ipv6_addr_loopback(const struct in6_addr *a)
367 return ((a->s6_addr32[0] | a->s6_addr32[1] |
368 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0);
371 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
373 return ((a->s6_addr32[0] | a->s6_addr32[1] |
374 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
378 * Check for a RFC 4843 ORCHID address
379 * (Overlay Routable Cryptographic Hash Identifiers)
381 static inline int ipv6_addr_orchid(const struct in6_addr *a)
383 return ((a->s6_addr32[0] & htonl(0xfffffff0))
384 == htonl(0x20010010));
387 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
388 struct in6_addr *v4mapped)
390 ipv6_addr_set(v4mapped,
397 * find the first different bit between two addresses
398 * length of address must be a multiple of 32bits
400 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
402 const __be32 *a1 = token1, *a2 = token2;
407 for (i = 0; i < addrlen; i++) {
408 __be32 xb = a1[i] ^ a2[i];
410 return i * 32 + 32 - fls(ntohl(xb));
414 * we should *never* get to this point since that
415 * would mean the addrs are equal
417 * However, we do get to it 8) And exacly, when
418 * addresses are equal 8)
420 * ip route add 1111::/128 via ...
421 * ip route add 1111::/64 via ...
424 * Ideally, this function should stop comparison
425 * at prefix length. It does not, but it is still OK,
426 * if returned value is greater than prefix length.
429 return (addrlen << 5);
432 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
434 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
438 * Prototypes exported by ipv6
442 * rcv function (called from netdevice level)
445 extern int ipv6_rcv(struct sk_buff *skb,
446 struct net_device *dev,
447 struct packet_type *pt,
448 struct net_device *orig_dev);
450 extern int ip6_rcv_finish(struct sk_buff *skb);
453 * upper-layer output functions
455 extern int ip6_xmit(struct sock *sk,
458 struct ipv6_txoptions *opt,
461 extern int ip6_nd_hdr(struct sock *sk,
463 struct net_device *dev,
464 const struct in6_addr *saddr,
465 const struct in6_addr *daddr,
468 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
470 extern int ip6_append_data(struct sock *sk,
471 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
477 struct ipv6_txoptions *opt,
482 extern int ip6_push_pending_frames(struct sock *sk);
484 extern void ip6_flush_pending_frames(struct sock *sk);
486 extern int ip6_dst_lookup(struct sock *sk,
487 struct dst_entry **dst,
489 extern int ip6_dst_blackhole(struct sock *sk,
490 struct dst_entry **dst,
492 extern int ip6_sk_dst_lookup(struct sock *sk,
493 struct dst_entry **dst,
497 * skb processing functions
500 extern int ip6_output(struct sk_buff *skb);
501 extern int ip6_forward(struct sk_buff *skb);
502 extern int ip6_input(struct sk_buff *skb);
503 extern int ip6_mc_input(struct sk_buff *skb);
505 extern int __ip6_local_out(struct sk_buff *skb);
506 extern int ip6_local_out(struct sk_buff *skb);
509 * Extension header (options) processing
512 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
513 struct ipv6_txoptions *opt,
515 struct in6_addr **daddr_p);
516 extern void ipv6_push_frag_opts(struct sk_buff *skb,
517 struct ipv6_txoptions *opt,
520 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
523 extern int ipv6_ext_hdr(u8 nexthdr);
525 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
528 * socket options (ipv6_sockglue.c)
531 extern int ipv6_setsockopt(struct sock *sk, int level,
535 extern int ipv6_getsockopt(struct sock *sk, int level,
539 extern int compat_ipv6_setsockopt(struct sock *sk,
544 extern int compat_ipv6_getsockopt(struct sock *sk,
550 extern int ip6_datagram_connect(struct sock *sk,
551 struct sockaddr *addr, int addr_len);
553 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
554 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
555 u32 info, u8 *payload);
556 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
558 extern int inet6_release(struct socket *sock);
559 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
561 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
562 int *uaddr_len, int peer);
563 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
566 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
572 extern const struct proto_ops inet6_stream_ops;
573 extern const struct proto_ops inet6_dgram_ops;
575 struct group_source_req;
578 extern int ip6_mc_source(int add, int omode, struct sock *sk,
579 struct group_source_req *pgsr);
580 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
581 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
582 struct group_filter __user *optval,
584 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
585 const struct in6_addr *daddr, u32 rnd);
587 #ifdef CONFIG_PROC_FS
588 extern int ac6_proc_init(struct net *net);
589 extern void ac6_proc_exit(struct net *net);
590 extern int raw6_proc_init(void);
591 extern void raw6_proc_exit(void);
592 extern int tcp6_proc_init(struct net *net);
593 extern void tcp6_proc_exit(struct net *net);
594 extern int udp6_proc_init(struct net *net);
595 extern void udp6_proc_exit(struct net *net);
596 extern int udplite6_proc_init(void);
597 extern void udplite6_proc_exit(void);
598 extern int ipv6_misc_proc_init(void);
599 extern void ipv6_misc_proc_exit(void);
600 extern int snmp6_register_dev(struct inet6_dev *idev);
601 extern int snmp6_unregister_dev(struct inet6_dev *idev);
604 static inline int ac6_proc_init(struct net *net) { return 0; }
605 static inline void ac6_proc_exit(struct net *net) { }
606 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
607 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
611 extern ctl_table ipv6_route_table_template[];
612 extern ctl_table ipv6_icmp_table_template[];
614 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
615 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
616 extern int ipv6_sysctl_register(void);
617 extern void ipv6_sysctl_unregister(void);
618 extern int ipv6_static_sysctl_register(void);
619 extern void ipv6_static_sysctl_unregister(void);
622 #endif /* __KERNEL__ */
623 #endif /* _NET_IPV6_H */