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 <linux/jhash.h>
19 #include <net/if_inet6.h>
20 #include <net/ndisc.h>
22 #include <net/flow_keys.h>
25 #define SIN6_LEN_RFC2133 24
27 #define IPV6_MAXPLEN 65535
30 * NextHeader field of IPv6 header
33 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
34 #define NEXTHDR_TCP 6 /* TCP segment. */
35 #define NEXTHDR_UDP 17 /* UDP message. */
36 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
37 #define NEXTHDR_ROUTING 43 /* Routing header. */
38 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
39 #define NEXTHDR_GRE 47 /* GRE header. */
40 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
41 #define NEXTHDR_AUTH 51 /* Authentication header. */
42 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
43 #define NEXTHDR_NONE 59 /* No next header */
44 #define NEXTHDR_DEST 60 /* Destination options header. */
45 #define NEXTHDR_SCTP 132 /* SCTP message. */
46 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
48 #define NEXTHDR_MAX 255
52 #define IPV6_DEFAULT_HOPLIMIT 64
53 #define IPV6_DEFAULT_MCASTHOPS 1
58 * type - unicast | multicast
59 * scope - local | site | global
66 #define IPV6_ADDR_ANY 0x0000U
68 #define IPV6_ADDR_UNICAST 0x0001U
69 #define IPV6_ADDR_MULTICAST 0x0002U
71 #define IPV6_ADDR_LOOPBACK 0x0010U
72 #define IPV6_ADDR_LINKLOCAL 0x0020U
73 #define IPV6_ADDR_SITELOCAL 0x0040U
75 #define IPV6_ADDR_COMPATv4 0x0080U
77 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
79 #define IPV6_ADDR_MAPPED 0x1000U
84 #define IPV6_ADDR_MC_SCOPE(a) \
85 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
86 #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
96 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
97 ((a)->s6_addr[1] & 0x10)
98 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
99 ((a)->s6_addr[1] & 0x20)
100 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
101 ((a)->s6_addr[1] & 0x40)
104 * fragmentation header
111 __be32 identification;
114 #define IP6_MF 0x0001
115 #define IP6_OFFSET 0xFFF8
117 #define IP6_REPLY_MARK(net, mark) \
118 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
120 #include <net/sock.h>
123 extern int sysctl_mld_max_msf;
125 #define _DEVINC(net, statname, modifier, idev, field) \
127 struct inet6_dev *_idev = (idev); \
128 if (likely(_idev != NULL)) \
129 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
130 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
133 /* per device counters are atomic_long_t */
134 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \
136 struct inet6_dev *_idev = (idev); \
137 if (likely(_idev != NULL)) \
138 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
139 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
142 /* per device and per net counters are atomic_long_t */
143 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
145 struct inet6_dev *_idev = (idev); \
146 if (likely(_idev != NULL)) \
147 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
148 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
151 #define _DEVADD(net, statname, modifier, idev, field, val) \
153 struct inet6_dev *_idev = (idev); \
154 if (likely(_idev != NULL)) \
155 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
156 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
159 #define _DEVUPD(net, statname, modifier, idev, field, val) \
161 struct inet6_dev *_idev = (idev); \
162 if (likely(_idev != NULL)) \
163 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
164 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
169 #define IP6_INC_STATS(net, idev,field) \
170 _DEVINC(net, ipv6, 64, idev, field)
171 #define IP6_INC_STATS_BH(net, idev,field) \
172 _DEVINC(net, ipv6, 64_BH, idev, field)
173 #define IP6_ADD_STATS(net, idev,field,val) \
174 _DEVADD(net, ipv6, 64, idev, field, val)
175 #define IP6_ADD_STATS_BH(net, idev,field,val) \
176 _DEVADD(net, ipv6, 64_BH, idev, field, val)
177 #define IP6_UPD_PO_STATS(net, idev,field,val) \
178 _DEVUPD(net, ipv6, 64, idev, field, val)
179 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
180 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
181 #define ICMP6_INC_STATS(net, idev, field) \
182 _DEVINCATOMIC(net, icmpv6, , idev, field)
183 #define ICMP6_INC_STATS_BH(net, idev, field) \
184 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
186 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
187 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
188 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
189 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
190 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
191 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
193 struct ip6_ra_chain {
194 struct ip6_ra_chain *next;
197 void (*destructor)(struct sock *);
200 extern struct ip6_ra_chain *ip6_ra_chain;
201 extern rwlock_t ip6_ra_lock;
204 This structure is prepared by protocol, when parsing
205 ancillary data and passed to IPv6.
208 struct ipv6_txoptions {
209 /* Length of this structure */
212 /* length of extension headers */
214 __u16 opt_flen; /* after fragment hdr */
215 __u16 opt_nflen; /* before fragment hdr */
217 struct ipv6_opt_hdr *hopopt;
218 struct ipv6_opt_hdr *dst0opt;
219 struct ipv6_rt_hdr *srcrt; /* Routing Header */
220 struct ipv6_opt_hdr *dst1opt;
222 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
225 struct ip6_flowlabel {
226 struct ip6_flowlabel __rcu *next;
230 struct ipv6_txoptions *opt;
231 unsigned long linger;
238 unsigned long lastuse;
239 unsigned long expires;
243 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
244 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
245 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
246 #define IPV6_TCLASS_SHIFT 20
248 struct ipv6_fl_socklist {
249 struct ipv6_fl_socklist __rcu *next;
250 struct ip6_flowlabel *fl;
254 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
255 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
256 struct ip6_flowlabel *fl,
257 struct ipv6_txoptions *fopt);
258 void fl6_free_socklist(struct sock *sk);
259 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
260 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
262 int ip6_flowlabel_init(void);
263 void ip6_flowlabel_cleanup(void);
265 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
268 atomic_dec(&fl->users);
271 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
273 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
274 struct icmp6hdr *thdr, int len);
276 int ip6_ra_control(struct sock *sk, int sel);
278 int ipv6_parse_hopopts(struct sk_buff *skb);
280 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
281 struct ipv6_txoptions *opt);
282 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
283 struct ipv6_txoptions *opt,
285 struct ipv6_opt_hdr __user *newopt,
287 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
288 struct ipv6_txoptions *opt);
290 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
292 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
294 /* If forwarding is enabled, RA are not accepted unless the special
295 * hybrid mode (accept_ra=2) is enabled.
297 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
301 #if IS_ENABLED(CONFIG_IPV6)
302 static inline int ip6_frag_nqueues(struct net *net)
304 return net->ipv6.frags.nqueues;
307 static inline int ip6_frag_mem(struct net *net)
309 return sum_frag_mem_limit(&net->ipv6.frags);
313 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
314 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
315 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
317 int __ipv6_addr_type(const struct in6_addr *addr);
318 static inline int ipv6_addr_type(const struct in6_addr *addr)
320 return __ipv6_addr_type(addr) & 0xffff;
323 static inline int ipv6_addr_scope(const struct in6_addr *addr)
325 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
328 static inline int __ipv6_addr_src_scope(int type)
330 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
333 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
335 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
338 static inline bool __ipv6_addr_needs_scope_id(int type)
340 return type & IPV6_ADDR_LINKLOCAL ||
341 (type & IPV6_ADDR_MULTICAST &&
342 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
345 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
347 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
350 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
352 return memcmp(a1, a2, sizeof(struct in6_addr));
356 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
357 const struct in6_addr *a2)
359 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
360 const unsigned long *ul1 = (const unsigned long *)a1;
361 const unsigned long *ulm = (const unsigned long *)m;
362 const unsigned long *ul2 = (const unsigned long *)a2;
364 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
365 ((ul1[1] ^ ul2[1]) & ulm[1]));
367 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
368 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
369 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
370 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
374 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
375 const struct in6_addr *addr,
378 /* caller must guarantee 0 <= plen <= 128 */
382 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
383 memcpy(pfx->s6_addr, addr, o);
385 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
388 static inline void __ipv6_addr_set_half(__be32 *addr,
389 __be32 wh, __be32 wl)
391 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
392 #if defined(__BIG_ENDIAN)
393 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
394 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
397 #elif defined(__LITTLE_ENDIAN)
398 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
399 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
408 static inline void ipv6_addr_set(struct in6_addr *addr,
409 __be32 w1, __be32 w2,
410 __be32 w3, __be32 w4)
412 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
413 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
416 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
417 const struct in6_addr *a2)
419 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
420 const unsigned long *ul1 = (const unsigned long *)a1;
421 const unsigned long *ul2 = (const unsigned long *)a2;
423 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
425 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
426 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
427 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
428 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
432 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
433 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
437 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
442 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
443 const struct in6_addr *addr2,
444 unsigned int prefixlen)
446 const __be64 *a1 = (const __be64 *)addr1;
447 const __be64 *a2 = (const __be64 *)addr2;
449 if (prefixlen >= 64) {
452 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
454 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
457 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
458 const struct in6_addr *addr2,
459 unsigned int prefixlen)
461 const __be32 *a1 = addr1->s6_addr32;
462 const __be32 *a2 = addr2->s6_addr32;
463 unsigned int pdw, pbi;
465 /* check complete u32 in prefix */
466 pdw = prefixlen >> 5;
467 if (pdw && memcmp(a1, a2, pdw << 2))
470 /* check incomplete u32 in prefix */
471 pbi = prefixlen & 0x1f;
472 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
479 struct inet_frag_queue;
481 enum ip6_defrag_users {
482 IP6_DEFRAG_LOCAL_DELIVER,
483 IP6_DEFRAG_CONNTRACK_IN,
484 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
485 IP6_DEFRAG_CONNTRACK_OUT,
486 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
487 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
488 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
491 struct ip6_create_arg {
494 const struct in6_addr *src;
495 const struct in6_addr *dst;
499 void ip6_frag_init(struct inet_frag_queue *q, void *a);
500 bool ip6_frag_match(struct inet_frag_queue *q, void *a);
503 * Equivalent of ipv4 struct ip
506 struct inet_frag_queue q;
508 __be32 id; /* fragment id */
510 struct in6_addr saddr;
511 struct in6_addr daddr;
519 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
520 struct inet_frags *frags);
522 static inline bool ipv6_addr_any(const struct in6_addr *a)
524 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
525 const unsigned long *ul = (const unsigned long *)a;
527 return (ul[0] | ul[1]) == 0UL;
529 return (a->s6_addr32[0] | a->s6_addr32[1] |
530 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
534 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
536 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
537 const unsigned long *ul = (const unsigned long *)a;
538 unsigned long x = ul[0] ^ ul[1];
540 return (u32)(x ^ (x >> 32));
542 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
543 a->s6_addr32[2] ^ a->s6_addr32[3]);
547 /* more secured version of ipv6_addr_hash() */
548 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
550 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
552 return jhash_3words(v,
553 (__force u32)a->s6_addr32[2],
554 (__force u32)a->s6_addr32[3],
558 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
560 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
561 const unsigned long *ul = (const unsigned long *)a;
563 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
565 return (a->s6_addr32[0] | a->s6_addr32[1] |
566 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
570 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
573 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
576 (a->s6_addr32[0] | a->s6_addr32[1]) |
578 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
582 * Check for a RFC 4843 ORCHID address
583 * (Overlay Routable Cryptographic Hash Identifiers)
585 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
587 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
590 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
592 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
595 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
596 struct in6_addr *v4mapped)
598 ipv6_addr_set(v4mapped,
605 * find the first different bit between two addresses
606 * length of address must be a multiple of 32bits
608 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
610 const __be32 *a1 = token1, *a2 = token2;
615 for (i = 0; i < addrlen; i++) {
616 __be32 xb = a1[i] ^ a2[i];
618 return i * 32 + 31 - __fls(ntohl(xb));
622 * we should *never* get to this point since that
623 * would mean the addrs are equal
625 * However, we do get to it 8) And exacly, when
626 * addresses are equal 8)
628 * ip route add 1111::/128 via ...
629 * ip route add 1111::/64 via ...
632 * Ideally, this function should stop comparison
633 * at prefix length. It does not, but it is still OK,
634 * if returned value is greater than prefix length.
640 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
641 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
643 const __be64 *a1 = token1, *a2 = token2;
648 for (i = 0; i < addrlen; i++) {
649 __be64 xb = a1[i] ^ a2[i];
651 return i * 64 + 63 - __fls(be64_to_cpu(xb));
658 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
660 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
661 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
662 return __ipv6_addr_diff64(token1, token2, addrlen);
664 return __ipv6_addr_diff32(token1, token2, addrlen);
667 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
669 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
672 int ip6_dst_hoplimit(struct dst_entry *dst);
674 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
675 struct dst_entry *dst)
679 if (ipv6_addr_is_multicast(&fl6->daddr))
680 hlimit = np->mcast_hops;
682 hlimit = np->hop_limit;
684 hlimit = ip6_dst_hoplimit(dst);
688 static inline void ip6_set_txhash(struct sock *sk)
690 struct inet_sock *inet = inet_sk(sk);
691 struct ipv6_pinfo *np = inet6_sk(sk);
692 struct flow_keys keys;
694 keys.src = (__force __be32)ipv6_addr_hash(&np->saddr);
695 keys.dst = (__force __be32)ipv6_addr_hash(&sk->sk_v6_daddr);
696 keys.port16[0] = inet->inet_sport;
697 keys.port16[1] = inet->inet_dport;
699 sk->sk_txhash = flow_hash_from_keys(&keys);
703 * Header manipulation
705 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
708 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
711 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
713 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
716 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
718 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
721 static inline u8 ip6_tclass(__be32 flowinfo)
723 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
726 * Prototypes exported by ipv6
730 * rcv function (called from netdevice level)
733 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
734 struct packet_type *pt, struct net_device *orig_dev);
736 int ip6_rcv_finish(struct sk_buff *skb);
739 * upper-layer output functions
741 int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
742 struct ipv6_txoptions *opt, int tclass);
744 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
746 int ip6_append_data(struct sock *sk,
747 int getfrag(void *from, char *to, int offset, int len,
748 int odd, struct sk_buff *skb),
749 void *from, int length, int transhdrlen, int hlimit,
750 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
751 struct rt6_info *rt, unsigned int flags, int dontfrag);
753 int ip6_push_pending_frames(struct sock *sk);
755 void ip6_flush_pending_frames(struct sock *sk);
757 int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6);
758 struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
759 const struct in6_addr *final_dst);
760 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
761 const struct in6_addr *final_dst);
762 struct dst_entry *ip6_blackhole_route(struct net *net,
763 struct dst_entry *orig_dst);
766 * skb processing functions
769 int ip6_output(struct sock *sk, struct sk_buff *skb);
770 int ip6_forward(struct sk_buff *skb);
771 int ip6_input(struct sk_buff *skb);
772 int ip6_mc_input(struct sk_buff *skb);
774 int __ip6_local_out(struct sk_buff *skb);
775 int ip6_local_out(struct sk_buff *skb);
778 * Extension header (options) processing
781 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
782 u8 *proto, struct in6_addr **daddr_p);
783 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
786 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
789 bool ipv6_ext_hdr(u8 nexthdr);
792 IP6_FH_F_FRAG = (1 << 0),
793 IP6_FH_F_AUTH = (1 << 1),
794 IP6_FH_F_SKIP_RH = (1 << 2),
797 /* find specified header and get offset to it */
798 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
799 unsigned short *fragoff, int *fragflg);
801 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
803 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
804 const struct ipv6_txoptions *opt,
805 struct in6_addr *orig);
808 * socket options (ipv6_sockglue.c)
811 int ipv6_setsockopt(struct sock *sk, int level, int optname,
812 char __user *optval, unsigned int optlen);
813 int ipv6_getsockopt(struct sock *sk, int level, int optname,
814 char __user *optval, int __user *optlen);
815 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
816 char __user *optval, unsigned int optlen);
817 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
818 char __user *optval, int __user *optlen);
820 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
821 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
824 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
826 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
828 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
829 u32 info, u8 *payload);
830 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
831 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
833 int inet6_release(struct socket *sock);
834 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
835 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
837 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
839 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
845 extern const struct proto_ops inet6_stream_ops;
846 extern const struct proto_ops inet6_dgram_ops;
848 struct group_source_req;
851 int ip6_mc_source(int add, int omode, struct sock *sk,
852 struct group_source_req *pgsr);
853 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
854 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
855 struct group_filter __user *optval, int __user *optlen);
857 #ifdef CONFIG_PROC_FS
858 int ac6_proc_init(struct net *net);
859 void ac6_proc_exit(struct net *net);
860 int raw6_proc_init(void);
861 void raw6_proc_exit(void);
862 int tcp6_proc_init(struct net *net);
863 void tcp6_proc_exit(struct net *net);
864 int udp6_proc_init(struct net *net);
865 void udp6_proc_exit(struct net *net);
866 int udplite6_proc_init(void);
867 void udplite6_proc_exit(void);
868 int ipv6_misc_proc_init(void);
869 void ipv6_misc_proc_exit(void);
870 int snmp6_register_dev(struct inet6_dev *idev);
871 int snmp6_unregister_dev(struct inet6_dev *idev);
874 static inline int ac6_proc_init(struct net *net) { return 0; }
875 static inline void ac6_proc_exit(struct net *net) { }
876 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
877 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
881 extern struct ctl_table ipv6_route_table_template[];
883 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
884 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
885 int ipv6_sysctl_register(void);
886 void ipv6_sysctl_unregister(void);
889 #endif /* _NET_IPV6_H */