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_dissector.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
50 #define IPV6_DEFAULT_HOPLIMIT 64
51 #define IPV6_DEFAULT_MCASTHOPS 1
56 * type - unicast | multicast
57 * scope - local | site | global
64 #define IPV6_ADDR_ANY 0x0000U
66 #define IPV6_ADDR_UNICAST 0x0001U
67 #define IPV6_ADDR_MULTICAST 0x0002U
69 #define IPV6_ADDR_LOOPBACK 0x0010U
70 #define IPV6_ADDR_LINKLOCAL 0x0020U
71 #define IPV6_ADDR_SITELOCAL 0x0040U
73 #define IPV6_ADDR_COMPATv4 0x0080U
75 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
77 #define IPV6_ADDR_MAPPED 0x1000U
82 #define IPV6_ADDR_MC_SCOPE(a) \
83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
84 #define __IPV6_ADDR_SCOPE_INVALID -1
85 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
86 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
87 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
88 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
89 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
94 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
95 ((a)->s6_addr[1] & 0x10)
96 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
97 ((a)->s6_addr[1] & 0x20)
98 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
99 ((a)->s6_addr[1] & 0x40)
102 * fragmentation header
109 __be32 identification;
112 #define IP6_MF 0x0001
113 #define IP6_OFFSET 0xFFF8
115 #define IP6_REPLY_MARK(net, mark) \
116 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
118 #include <net/sock.h>
121 extern int sysctl_mld_max_msf;
122 extern int sysctl_mld_qrv;
124 #define _DEVINC(net, statname, mod, idev, field) \
126 struct inet6_dev *_idev = (idev); \
127 if (likely(_idev != NULL)) \
128 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
129 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
132 /* per device counters are atomic_long_t */
133 #define _DEVINCATOMIC(net, statname, mod, idev, field) \
135 struct inet6_dev *_idev = (idev); \
136 if (likely(_idev != NULL)) \
137 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
138 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
141 /* per device and per net counters are atomic_long_t */
142 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
144 struct inet6_dev *_idev = (idev); \
145 if (likely(_idev != NULL)) \
146 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
147 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
150 #define _DEVADD(net, statname, mod, idev, field, val) \
152 struct inet6_dev *_idev = (idev); \
153 if (likely(_idev != NULL)) \
154 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
155 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
158 #define _DEVUPD(net, statname, mod, idev, field, val) \
160 struct inet6_dev *_idev = (idev); \
161 if (likely(_idev != NULL)) \
162 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
163 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
168 #define IP6_INC_STATS(net, idev,field) \
169 _DEVINC(net, ipv6, , idev, field)
170 #define __IP6_INC_STATS(net, idev,field) \
171 _DEVINC(net, ipv6, __, idev, field)
172 #define IP6_ADD_STATS(net, idev,field,val) \
173 _DEVADD(net, ipv6, , idev, field, val)
174 #define __IP6_ADD_STATS(net, idev,field,val) \
175 _DEVADD(net, ipv6, __, idev, field, val)
176 #define IP6_UPD_PO_STATS(net, idev,field,val) \
177 _DEVUPD(net, ipv6, , idev, field, val)
178 #define __IP6_UPD_PO_STATS(net, idev,field,val) \
179 _DEVUPD(net, ipv6, __, idev, field, val)
180 #define ICMP6_INC_STATS(net, idev, field) \
181 _DEVINCATOMIC(net, icmpv6, , idev, field)
182 #define __ICMP6_INC_STATS(net, idev, field) \
183 _DEVINCATOMIC(net, icmpv6, __, idev, field)
185 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
187 #define ICMP6MSGIN_INC_STATS(net, idev, field) \
188 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
190 struct ip6_ra_chain {
191 struct ip6_ra_chain *next;
194 void (*destructor)(struct sock *);
197 extern struct ip6_ra_chain *ip6_ra_chain;
198 extern rwlock_t ip6_ra_lock;
201 This structure is prepared by protocol, when parsing
202 ancillary data and passed to IPv6.
205 struct ipv6_txoptions {
207 /* Length of this structure */
210 /* length of extension headers */
212 __u16 opt_flen; /* after fragment hdr */
213 __u16 opt_nflen; /* before fragment hdr */
215 struct ipv6_opt_hdr *hopopt;
216 struct ipv6_opt_hdr *dst0opt;
217 struct ipv6_rt_hdr *srcrt; /* Routing Header */
218 struct ipv6_opt_hdr *dst1opt;
220 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
223 struct ip6_flowlabel {
224 struct ip6_flowlabel __rcu *next;
228 struct ipv6_txoptions *opt;
229 unsigned long linger;
236 unsigned long lastuse;
237 unsigned long expires;
241 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
242 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
243 #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
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 ipcm6_cookie {
258 struct ipv6_txoptions *opt;
261 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
263 struct ipv6_txoptions *opt;
266 opt = rcu_dereference(np->opt);
268 if (!atomic_inc_not_zero(&opt->refcnt))
271 opt = rcu_pointer_handoff(opt);
277 static inline void txopt_put(struct ipv6_txoptions *opt)
279 if (opt && atomic_dec_and_test(&opt->refcnt))
283 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
284 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
285 struct ip6_flowlabel *fl,
286 struct ipv6_txoptions *fopt);
287 void fl6_free_socklist(struct sock *sk);
288 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
289 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
291 int ip6_flowlabel_init(void);
292 void ip6_flowlabel_cleanup(void);
293 bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
295 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
298 atomic_dec(&fl->users);
301 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
303 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
304 struct icmp6hdr *thdr, int len);
306 int ip6_ra_control(struct sock *sk, int sel);
308 int ipv6_parse_hopopts(struct sk_buff *skb);
310 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
311 struct ipv6_txoptions *opt);
312 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
313 struct ipv6_txoptions *opt,
315 struct ipv6_opt_hdr *newopt);
316 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
317 struct ipv6_txoptions *opt);
319 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
320 const struct inet6_skb_parm *opt);
321 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
322 struct ipv6_txoptions *opt);
324 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
326 /* If forwarding is enabled, RA are not accepted unless the special
327 * hybrid mode (accept_ra=2) is enabled.
329 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
333 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
334 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
335 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
337 int __ipv6_addr_type(const struct in6_addr *addr);
338 static inline int ipv6_addr_type(const struct in6_addr *addr)
340 return __ipv6_addr_type(addr) & 0xffff;
343 static inline int ipv6_addr_scope(const struct in6_addr *addr)
345 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
348 static inline int __ipv6_addr_src_scope(int type)
350 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
353 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
355 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
358 static inline bool __ipv6_addr_needs_scope_id(int type)
360 return type & IPV6_ADDR_LINKLOCAL ||
361 (type & IPV6_ADDR_MULTICAST &&
362 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
365 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
367 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
370 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
372 return memcmp(a1, a2, sizeof(struct in6_addr));
376 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
377 const struct in6_addr *a2)
379 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
380 const unsigned long *ul1 = (const unsigned long *)a1;
381 const unsigned long *ulm = (const unsigned long *)m;
382 const unsigned long *ul2 = (const unsigned long *)a2;
384 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
385 ((ul1[1] ^ ul2[1]) & ulm[1]));
387 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
388 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
389 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
390 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
394 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
395 const struct in6_addr *addr,
398 /* caller must guarantee 0 <= plen <= 128 */
402 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
403 memcpy(pfx->s6_addr, addr, o);
405 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
408 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
409 const struct in6_addr *pfx,
412 /* caller must guarantee 0 <= plen <= 128 */
416 memcpy(addr->s6_addr, pfx, o);
418 addr->s6_addr[o] &= ~(0xff00 >> b);
419 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
423 static inline void __ipv6_addr_set_half(__be32 *addr,
424 __be32 wh, __be32 wl)
426 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
427 #if defined(__BIG_ENDIAN)
428 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
429 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
432 #elif defined(__LITTLE_ENDIAN)
433 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
434 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
443 static inline void ipv6_addr_set(struct in6_addr *addr,
444 __be32 w1, __be32 w2,
445 __be32 w3, __be32 w4)
447 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
448 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
451 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
452 const struct in6_addr *a2)
454 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
455 const unsigned long *ul1 = (const unsigned long *)a1;
456 const unsigned long *ul2 = (const unsigned long *)a2;
458 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
460 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
461 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
462 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
463 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
467 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
468 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
472 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
477 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
478 const struct in6_addr *addr2,
479 unsigned int prefixlen)
481 const __be64 *a1 = (const __be64 *)addr1;
482 const __be64 *a2 = (const __be64 *)addr2;
484 if (prefixlen >= 64) {
487 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
489 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
492 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
493 const struct in6_addr *addr2,
494 unsigned int prefixlen)
496 const __be32 *a1 = addr1->s6_addr32;
497 const __be32 *a2 = addr2->s6_addr32;
498 unsigned int pdw, pbi;
500 /* check complete u32 in prefix */
501 pdw = prefixlen >> 5;
502 if (pdw && memcmp(a1, a2, pdw << 2))
505 /* check incomplete u32 in prefix */
506 pbi = prefixlen & 0x1f;
507 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
514 static inline bool ipv6_addr_any(const struct in6_addr *a)
516 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
517 const unsigned long *ul = (const unsigned long *)a;
519 return (ul[0] | ul[1]) == 0UL;
521 return (a->s6_addr32[0] | a->s6_addr32[1] |
522 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
526 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
528 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
529 const unsigned long *ul = (const unsigned long *)a;
530 unsigned long x = ul[0] ^ ul[1];
532 return (u32)(x ^ (x >> 32));
534 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
535 a->s6_addr32[2] ^ a->s6_addr32[3]);
539 /* more secured version of ipv6_addr_hash() */
540 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
542 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
544 return jhash_3words(v,
545 (__force u32)a->s6_addr32[2],
546 (__force u32)a->s6_addr32[3],
550 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
552 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
553 const __be64 *be = (const __be64 *)a;
555 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
557 return (a->s6_addr32[0] | a->s6_addr32[1] |
558 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
563 * Note that we must __force cast these to unsigned long to make sparse happy,
564 * since all of the endian-annotated types are fixed size regardless of arch.
566 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
569 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
570 *(unsigned long *)a |
572 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
574 (__force unsigned long)(a->s6_addr32[2] ^
575 cpu_to_be32(0x0000ffff))) == 0UL;
579 * Check for a RFC 4843 ORCHID address
580 * (Overlay Routable Cryptographic Hash Identifiers)
582 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
584 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
587 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
589 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
592 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
593 struct in6_addr *v4mapped)
595 ipv6_addr_set(v4mapped,
602 * find the first different bit between two addresses
603 * length of address must be a multiple of 32bits
605 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
607 const __be32 *a1 = token1, *a2 = token2;
612 for (i = 0; i < addrlen; i++) {
613 __be32 xb = a1[i] ^ a2[i];
615 return i * 32 + 31 - __fls(ntohl(xb));
619 * we should *never* get to this point since that
620 * would mean the addrs are equal
622 * However, we do get to it 8) And exacly, when
623 * addresses are equal 8)
625 * ip route add 1111::/128 via ...
626 * ip route add 1111::/64 via ...
629 * Ideally, this function should stop comparison
630 * at prefix length. It does not, but it is still OK,
631 * if returned value is greater than prefix length.
637 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
638 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
640 const __be64 *a1 = token1, *a2 = token2;
645 for (i = 0; i < addrlen; i++) {
646 __be64 xb = a1[i] ^ a2[i];
648 return i * 64 + 63 - __fls(be64_to_cpu(xb));
655 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
657 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
658 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
659 return __ipv6_addr_diff64(token1, token2, addrlen);
661 return __ipv6_addr_diff32(token1, token2, addrlen);
664 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
666 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
669 __be32 ipv6_select_ident(struct net *net,
670 const struct in6_addr *daddr,
671 const struct in6_addr *saddr);
672 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
674 int ip6_dst_hoplimit(struct dst_entry *dst);
676 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
677 struct dst_entry *dst)
681 if (ipv6_addr_is_multicast(&fl6->daddr))
682 hlimit = np->mcast_hops;
684 hlimit = np->hop_limit;
686 hlimit = ip6_dst_hoplimit(dst);
690 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
691 * Equivalent to : flow->v6addrs.src = iph->saddr;
692 * flow->v6addrs.dst = iph->daddr;
694 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
695 const struct ipv6hdr *iph)
697 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
698 offsetof(typeof(flow->addrs), v6addrs.src) +
699 sizeof(flow->addrs.v6addrs.src));
700 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
701 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
704 #if IS_ENABLED(CONFIG_IPV6)
706 /* Sysctl settings for net ipv6.auto_flowlabels */
707 #define IP6_AUTO_FLOW_LABEL_OFF 0
708 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1
709 #define IP6_AUTO_FLOW_LABEL_OPTIN 2
710 #define IP6_AUTO_FLOW_LABEL_FORCED 3
712 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
714 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
716 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
717 __be32 flowlabel, bool autolabel,
722 /* @flowlabel may include more than a flow label, eg, the traffic class.
723 * Here we want only the flow label value.
725 flowlabel &= IPV6_FLOWLABEL_MASK;
728 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
730 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
733 hash = skb_get_hash_flowi6(skb, fl6);
735 /* Since this is being sent on the wire obfuscate hash a bit
736 * to minimize possbility that any useful information to an
737 * attacker is leaked. Only lower 20 bits are relevant.
739 hash = rol32(hash, 16);
741 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
743 if (net->ipv6.sysctl.flowlabel_state_ranges)
744 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
749 static inline int ip6_default_np_autolabel(struct net *net)
751 switch (net->ipv6.sysctl.auto_flowlabels) {
752 case IP6_AUTO_FLOW_LABEL_OFF:
753 case IP6_AUTO_FLOW_LABEL_OPTIN:
756 case IP6_AUTO_FLOW_LABEL_OPTOUT:
757 case IP6_AUTO_FLOW_LABEL_FORCED:
762 static inline void ip6_set_txhash(struct sock *sk) { }
763 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
764 __be32 flowlabel, bool autolabel,
769 static inline int ip6_default_np_autolabel(struct net *net)
777 * Header manipulation
779 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
782 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
785 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
787 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
790 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
792 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
795 static inline u8 ip6_tclass(__be32 flowinfo)
797 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
800 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
802 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
806 * Prototypes exported by ipv6
810 * rcv function (called from netdevice level)
813 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
814 struct packet_type *pt, struct net_device *orig_dev);
816 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
819 * upper-layer output functions
821 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
822 __u32 mark, struct ipv6_txoptions *opt, int tclass);
824 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
826 int ip6_append_data(struct sock *sk,
827 int getfrag(void *from, char *to, int offset, int len,
828 int odd, struct sk_buff *skb),
829 void *from, int length, int transhdrlen,
830 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
831 struct rt6_info *rt, unsigned int flags,
832 const struct sockcm_cookie *sockc);
834 int ip6_push_pending_frames(struct sock *sk);
836 void ip6_flush_pending_frames(struct sock *sk);
838 int ip6_send_skb(struct sk_buff *skb);
840 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
841 struct inet_cork_full *cork,
842 struct inet6_cork *v6_cork);
843 struct sk_buff *ip6_make_skb(struct sock *sk,
844 int getfrag(void *from, char *to, int offset,
845 int len, int odd, struct sk_buff *skb),
846 void *from, int length, int transhdrlen,
847 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
848 struct rt6_info *rt, unsigned int flags,
849 const struct sockcm_cookie *sockc);
851 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
853 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
854 &inet6_sk(sk)->cork);
857 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
859 struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6,
860 const struct in6_addr *final_dst);
861 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
862 const struct in6_addr *final_dst);
863 struct dst_entry *ip6_blackhole_route(struct net *net,
864 struct dst_entry *orig_dst);
867 * skb processing functions
870 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
871 int ip6_forward(struct sk_buff *skb);
872 int ip6_input(struct sk_buff *skb);
873 int ip6_mc_input(struct sk_buff *skb);
875 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
876 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
879 * Extension header (options) processing
882 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
883 u8 *proto, struct in6_addr **daddr_p);
884 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
887 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
890 bool ipv6_ext_hdr(u8 nexthdr);
893 IP6_FH_F_FRAG = (1 << 0),
894 IP6_FH_F_AUTH = (1 << 1),
895 IP6_FH_F_SKIP_RH = (1 << 2),
898 /* find specified header and get offset to it */
899 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
900 unsigned short *fragoff, int *fragflg);
902 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
904 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
905 const struct ipv6_txoptions *opt,
906 struct in6_addr *orig);
909 * socket options (ipv6_sockglue.c)
912 int ipv6_setsockopt(struct sock *sk, int level, int optname,
913 char __user *optval, unsigned int optlen);
914 int ipv6_getsockopt(struct sock *sk, int level, int optname,
915 char __user *optval, int __user *optlen);
916 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
917 char __user *optval, unsigned int optlen);
918 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
919 char __user *optval, int __user *optlen);
921 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
923 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
924 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
926 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
927 void ip6_datagram_release_cb(struct sock *sk);
929 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
931 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
933 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
934 u32 info, u8 *payload);
935 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
936 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
938 int inet6_release(struct socket *sock);
939 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
940 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
942 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
944 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
950 extern const struct proto_ops inet6_stream_ops;
951 extern const struct proto_ops inet6_dgram_ops;
952 extern const struct proto_ops inet6_sockraw_ops;
954 struct group_source_req;
957 int ip6_mc_source(int add, int omode, struct sock *sk,
958 struct group_source_req *pgsr);
959 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
960 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
961 struct group_filter __user *optval, int __user *optlen);
963 #ifdef CONFIG_PROC_FS
964 int ac6_proc_init(struct net *net);
965 void ac6_proc_exit(struct net *net);
966 int raw6_proc_init(void);
967 void raw6_proc_exit(void);
968 int tcp6_proc_init(struct net *net);
969 void tcp6_proc_exit(struct net *net);
970 int udp6_proc_init(struct net *net);
971 void udp6_proc_exit(struct net *net);
972 int udplite6_proc_init(void);
973 void udplite6_proc_exit(void);
974 int ipv6_misc_proc_init(void);
975 void ipv6_misc_proc_exit(void);
976 int snmp6_register_dev(struct inet6_dev *idev);
977 int snmp6_unregister_dev(struct inet6_dev *idev);
980 static inline int ac6_proc_init(struct net *net) { return 0; }
981 static inline void ac6_proc_exit(struct net *net) { }
982 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
983 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
987 extern struct ctl_table ipv6_route_table_template[];
989 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
990 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
991 int ipv6_sysctl_register(void);
992 void ipv6_sysctl_unregister(void);
995 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
996 const struct in6_addr *addr);
997 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
998 const struct in6_addr *addr);
999 #endif /* _NET_IPV6_H */