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TOMOYO Linux Cross Reference
Linux/include/net/ipv6.h

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  1 /*
  2  *      Linux INET6 implementation
  3  *
  4  *      Authors:
  5  *      Pedro Roque             <roque@di.fc.ul.pt>
  6  *
  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.
 11  */
 12 
 13 #ifndef _NET_IPV6_H
 14 #define _NET_IPV6_H
 15 
 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>
 21 #include <net/flow.h>
 22 #include <net/flow_dissector.h>
 23 #include <net/snmp.h>
 24 
 25 #define SIN6_LEN_RFC2133        24
 26 
 27 #define IPV6_MAXPLEN            65535
 28 
 29 /*
 30  *      NextHeader field of IPv6 header
 31  */
 32 
 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. */
 47 
 48 #define NEXTHDR_MAX             255
 49 
 50 #define IPV6_DEFAULT_HOPLIMIT   64
 51 #define IPV6_DEFAULT_MCASTHOPS  1
 52 
 53 /*
 54  *      Addr type
 55  *      
 56  *      type    -       unicast | multicast
 57  *      scope   -       local   | site      | global
 58  *      v4      -       compat
 59  *      v4mapped
 60  *      any
 61  *      loopback
 62  */
 63 
 64 #define IPV6_ADDR_ANY           0x0000U
 65 
 66 #define IPV6_ADDR_UNICAST       0x0001U 
 67 #define IPV6_ADDR_MULTICAST     0x0002U 
 68 
 69 #define IPV6_ADDR_LOOPBACK      0x0010U
 70 #define IPV6_ADDR_LINKLOCAL     0x0020U
 71 #define IPV6_ADDR_SITELOCAL     0x0040U
 72 
 73 #define IPV6_ADDR_COMPATv4      0x0080U
 74 
 75 #define IPV6_ADDR_SCOPE_MASK    0x00f0U
 76 
 77 #define IPV6_ADDR_MAPPED        0x1000U
 78 
 79 /*
 80  *      Addr scopes
 81  */
 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
 90 
 91 /*
 92  *      Addr flags
 93  */
 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)
100 
101 /*
102  *      fragmentation header
103  */
104 
105 struct frag_hdr {
106         __u8    nexthdr;
107         __u8    reserved;
108         __be16  frag_off;
109         __be32  identification;
110 };
111 
112 #define IP6_MF          0x0001
113 #define IP6_OFFSET      0xFFF8
114 
115 #define IP6_REPLY_MARK(net, mark) \
116         ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
117 
118 #include <net/sock.h>
119 
120 /* sysctls */
121 extern int sysctl_mld_max_msf;
122 extern int sysctl_mld_qrv;
123 
124 #define _DEVINC(net, statname, modifier, idev, field)                   \
125 ({                                                                      \
126         struct inet6_dev *_idev = (idev);                               \
127         if (likely(_idev != NULL))                                      \
128                 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
129         SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
130 })
131 
132 /* per device counters are atomic_long_t */
133 #define _DEVINCATOMIC(net, statname, modifier, idev, field)             \
134 ({                                                                      \
135         struct inet6_dev *_idev = (idev);                               \
136         if (likely(_idev != NULL))                                      \
137                 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
138         SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
139 })
140 
141 /* per device and per net counters are atomic_long_t */
142 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field)               \
143 ({                                                                      \
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));\
148 })
149 
150 #define _DEVADD(net, statname, modifier, idev, field, val)              \
151 ({                                                                      \
152         struct inet6_dev *_idev = (idev);                               \
153         if (likely(_idev != NULL))                                      \
154                 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
155         SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
156 })
157 
158 #define _DEVUPD(net, statname, modifier, idev, field, val)              \
159 ({                                                                      \
160         struct inet6_dev *_idev = (idev);                               \
161         if (likely(_idev != NULL))                                      \
162                 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
163         SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
164 })
165 
166 /* MIBs */
167 
168 #define IP6_INC_STATS(net, idev,field)          \
169                 _DEVINC(net, ipv6, 64, idev, field)
170 #define IP6_INC_STATS_BH(net, idev,field)       \
171                 _DEVINC(net, ipv6, 64_BH, idev, field)
172 #define IP6_ADD_STATS(net, idev,field,val)      \
173                 _DEVADD(net, ipv6, 64, idev, field, val)
174 #define IP6_ADD_STATS_BH(net, idev,field,val)   \
175                 _DEVADD(net, ipv6, 64_BH, idev, field, val)
176 #define IP6_UPD_PO_STATS(net, idev,field,val)   \
177                 _DEVUPD(net, ipv6, 64, idev, field, val)
178 #define IP6_UPD_PO_STATS_BH(net, idev,field,val)   \
179                 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
180 #define ICMP6_INC_STATS(net, idev, field)       \
181                 _DEVINCATOMIC(net, icmpv6, , idev, field)
182 #define ICMP6_INC_STATS_BH(net, idev, field)    \
183                 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
184 
185 #define ICMP6MSGOUT_INC_STATS(net, idev, field)         \
186         _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
187 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field)      \
188         _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
189 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field)       \
190         _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
191 
192 struct ip6_ra_chain {
193         struct ip6_ra_chain     *next;
194         struct sock             *sk;
195         int                     sel;
196         void                    (*destructor)(struct sock *);
197 };
198 
199 extern struct ip6_ra_chain      *ip6_ra_chain;
200 extern rwlock_t ip6_ra_lock;
201 
202 /*
203    This structure is prepared by protocol, when parsing
204    ancillary data and passed to IPv6.
205  */
206 
207 struct ipv6_txoptions {
208         atomic_t                refcnt;
209         /* Length of this structure */
210         int                     tot_len;
211 
212         /* length of extension headers   */
213 
214         __u16                   opt_flen;       /* after fragment hdr */
215         __u16                   opt_nflen;      /* before fragment hdr */
216 
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;
221         struct rcu_head         rcu;
222         /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
223 };
224 
225 struct ip6_flowlabel {
226         struct ip6_flowlabel __rcu *next;
227         __be32                  label;
228         atomic_t                users;
229         struct in6_addr         dst;
230         struct ipv6_txoptions   *opt;
231         unsigned long           linger;
232         struct rcu_head         rcu;
233         u8                      share;
234         union {
235                 struct pid *pid;
236                 kuid_t uid;
237         } owner;
238         unsigned long           lastuse;
239         unsigned long           expires;
240         struct net              *fl_net;
241 };
242 
243 #define IPV6_FLOWINFO_MASK              cpu_to_be32(0x0FFFFFFF)
244 #define IPV6_FLOWLABEL_MASK             cpu_to_be32(0x000FFFFF)
245 #define IPV6_FLOWLABEL_STATELESS_FLAG   cpu_to_be32(0x00080000)
246 
247 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
248 #define IPV6_TCLASS_SHIFT       20
249 
250 struct ipv6_fl_socklist {
251         struct ipv6_fl_socklist __rcu   *next;
252         struct ip6_flowlabel            *fl;
253         struct rcu_head                 rcu;
254 };
255 
256 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
257 {
258         struct ipv6_txoptions *opt;
259 
260         rcu_read_lock();
261         opt = rcu_dereference(np->opt);
262         if (opt) {
263                 if (!atomic_inc_not_zero(&opt->refcnt))
264                         opt = NULL;
265                 else
266                         opt = rcu_pointer_handoff(opt);
267         }
268         rcu_read_unlock();
269         return opt;
270 }
271 
272 static inline void txopt_put(struct ipv6_txoptions *opt)
273 {
274         if (opt && atomic_dec_and_test(&opt->refcnt))
275                 kfree_rcu(opt, rcu);
276 }
277 
278 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
279 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
280                                          struct ip6_flowlabel *fl,
281                                          struct ipv6_txoptions *fopt);
282 void fl6_free_socklist(struct sock *sk);
283 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
284 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
285                            int flags);
286 int ip6_flowlabel_init(void);
287 void ip6_flowlabel_cleanup(void);
288 
289 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
290 {
291         if (fl)
292                 atomic_dec(&fl->users);
293 }
294 
295 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
296 
297 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
298                                struct icmp6hdr *thdr, int len);
299 
300 int ip6_ra_control(struct sock *sk, int sel);
301 
302 int ipv6_parse_hopopts(struct sk_buff *skb);
303 
304 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
305                                         struct ipv6_txoptions *opt);
306 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
307                                           struct ipv6_txoptions *opt,
308                                           int newtype,
309                                           struct ipv6_opt_hdr __user *newopt,
310                                           int newoptlen);
311 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
312                                           struct ipv6_txoptions *opt);
313 
314 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
315                        const struct inet6_skb_parm *opt);
316 
317 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
318 {
319         /* If forwarding is enabled, RA are not accepted unless the special
320          * hybrid mode (accept_ra=2) is enabled.
321          */
322         return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
323             idev->cnf.accept_ra;
324 }
325 
326 #if IS_ENABLED(CONFIG_IPV6)
327 static inline int ip6_frag_mem(struct net *net)
328 {
329         return sum_frag_mem_limit(&net->ipv6.frags);
330 }
331 #endif
332 
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 */
336 
337 int __ipv6_addr_type(const struct in6_addr *addr);
338 static inline int ipv6_addr_type(const struct in6_addr *addr)
339 {
340         return __ipv6_addr_type(addr) & 0xffff;
341 }
342 
343 static inline int ipv6_addr_scope(const struct in6_addr *addr)
344 {
345         return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
346 }
347 
348 static inline int __ipv6_addr_src_scope(int type)
349 {
350         return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
351 }
352 
353 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
354 {
355         return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
356 }
357 
358 static inline bool __ipv6_addr_needs_scope_id(int type)
359 {
360         return type & IPV6_ADDR_LINKLOCAL ||
361                (type & IPV6_ADDR_MULTICAST &&
362                 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
363 }
364 
365 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
366 {
367         return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
368 }
369 
370 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
371 {
372         return memcmp(a1, a2, sizeof(struct in6_addr));
373 }
374 
375 static inline bool
376 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
377                      const struct in6_addr *a2)
378 {
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;
383 
384         return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
385                   ((ul1[1] ^ ul2[1]) & ulm[1]));
386 #else
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]));
391 #endif
392 }
393 
394 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 
395                                     const struct in6_addr *addr,
396                                     int plen)
397 {
398         /* caller must guarantee 0 <= plen <= 128 */
399         int o = plen >> 3,
400             b = plen & 0x7;
401 
402         memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
403         memcpy(pfx->s6_addr, addr, o);
404         if (b != 0)
405                 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
406 }
407 
408 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
409                                          const struct in6_addr *pfx,
410                                          int plen)
411 {
412         /* caller must guarantee 0 <= plen <= 128 */
413         int o = plen >> 3,
414             b = plen & 0x7;
415 
416         memcpy(addr->s6_addr, pfx, o);
417         if (b != 0) {
418                 addr->s6_addr[o] &= ~(0xff00 >> b);
419                 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
420         }
421 }
422 
423 static inline void __ipv6_addr_set_half(__be32 *addr,
424                                         __be32 wh, __be32 wl)
425 {
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));
430                 return;
431         }
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));
435                 return;
436         }
437 #endif
438 #endif
439         addr[0] = wh;
440         addr[1] = wl;
441 }
442 
443 static inline void ipv6_addr_set(struct in6_addr *addr, 
444                                      __be32 w1, __be32 w2,
445                                      __be32 w3, __be32 w4)
446 {
447         __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
448         __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
449 }
450 
451 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
452                                    const struct in6_addr *a2)
453 {
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;
457 
458         return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
459 #else
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;
464 #endif
465 }
466 
467 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
468 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
469                                               const __be64 *a2,
470                                               unsigned int len)
471 {
472         if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
473                 return false;
474         return true;
475 }
476 
477 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
478                                      const struct in6_addr *addr2,
479                                      unsigned int prefixlen)
480 {
481         const __be64 *a1 = (const __be64 *)addr1;
482         const __be64 *a2 = (const __be64 *)addr2;
483 
484         if (prefixlen >= 64) {
485                 if (a1[0] ^ a2[0])
486                         return false;
487                 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
488         }
489         return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
490 }
491 #else
492 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
493                                      const struct in6_addr *addr2,
494                                      unsigned int prefixlen)
495 {
496         const __be32 *a1 = addr1->s6_addr32;
497         const __be32 *a2 = addr2->s6_addr32;
498         unsigned int pdw, pbi;
499 
500         /* check complete u32 in prefix */
501         pdw = prefixlen >> 5;
502         if (pdw && memcmp(a1, a2, pdw << 2))
503                 return false;
504 
505         /* check incomplete u32 in prefix */
506         pbi = prefixlen & 0x1f;
507         if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
508                 return false;
509 
510         return true;
511 }
512 #endif
513 
514 struct inet_frag_queue;
515 
516 enum ip6_defrag_users {
517         IP6_DEFRAG_LOCAL_DELIVER,
518         IP6_DEFRAG_CONNTRACK_IN,
519         __IP6_DEFRAG_CONNTRACK_IN       = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
520         IP6_DEFRAG_CONNTRACK_OUT,
521         __IP6_DEFRAG_CONNTRACK_OUT      = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
522         IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
523         __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
524 };
525 
526 struct ip6_create_arg {
527         __be32 id;
528         u32 user;
529         const struct in6_addr *src;
530         const struct in6_addr *dst;
531         int iif;
532         u8 ecn;
533 };
534 
535 void ip6_frag_init(struct inet_frag_queue *q, const void *a);
536 bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
537 
538 /*
539  *      Equivalent of ipv4 struct ip
540  */
541 struct frag_queue {
542         struct inet_frag_queue  q;
543 
544         __be32                  id;             /* fragment id          */
545         u32                     user;
546         struct in6_addr         saddr;
547         struct in6_addr         daddr;
548 
549         int                     iif;
550         unsigned int            csum;
551         __u16                   nhoffset;
552         u8                      ecn;
553 };
554 
555 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
556                            struct inet_frags *frags);
557 
558 static inline bool ipv6_addr_any(const struct in6_addr *a)
559 {
560 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
561         const unsigned long *ul = (const unsigned long *)a;
562 
563         return (ul[0] | ul[1]) == 0UL;
564 #else
565         return (a->s6_addr32[0] | a->s6_addr32[1] |
566                 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
567 #endif
568 }
569 
570 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
571 {
572 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
573         const unsigned long *ul = (const unsigned long *)a;
574         unsigned long x = ul[0] ^ ul[1];
575 
576         return (u32)(x ^ (x >> 32));
577 #else
578         return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
579                              a->s6_addr32[2] ^ a->s6_addr32[3]);
580 #endif
581 }
582 
583 /* more secured version of ipv6_addr_hash() */
584 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
585 {
586         u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
587 
588         return jhash_3words(v,
589                             (__force u32)a->s6_addr32[2],
590                             (__force u32)a->s6_addr32[3],
591                             initval);
592 }
593 
594 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
595 {
596 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
597         const __be64 *be = (const __be64 *)a;
598 
599         return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
600 #else
601         return (a->s6_addr32[0] | a->s6_addr32[1] |
602                 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
603 #endif
604 }
605 
606 /*
607  * Note that we must __force cast these to unsigned long to make sparse happy,
608  * since all of the endian-annotated types are fixed size regardless of arch.
609  */
610 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
611 {
612         return (
613 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
614                 *(unsigned long *)a |
615 #else
616                 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
617 #endif
618                 (__force unsigned long)(a->s6_addr32[2] ^
619                                         cpu_to_be32(0x0000ffff))) == 0UL;
620 }
621 
622 /*
623  * Check for a RFC 4843 ORCHID address
624  * (Overlay Routable Cryptographic Hash Identifiers)
625  */
626 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
627 {
628         return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
629 }
630 
631 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
632 {
633         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
634 }
635 
636 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
637                                           struct in6_addr *v4mapped)
638 {
639         ipv6_addr_set(v4mapped,
640                         0, 0,
641                         htonl(0x0000FFFF),
642                         addr);
643 }
644 
645 /*
646  * find the first different bit between two addresses
647  * length of address must be a multiple of 32bits
648  */
649 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
650 {
651         const __be32 *a1 = token1, *a2 = token2;
652         int i;
653 
654         addrlen >>= 2;
655 
656         for (i = 0; i < addrlen; i++) {
657                 __be32 xb = a1[i] ^ a2[i];
658                 if (xb)
659                         return i * 32 + 31 - __fls(ntohl(xb));
660         }
661 
662         /*
663          *      we should *never* get to this point since that 
664          *      would mean the addrs are equal
665          *
666          *      However, we do get to it 8) And exacly, when
667          *      addresses are equal 8)
668          *
669          *      ip route add 1111::/128 via ...
670          *      ip route add 1111::/64 via ...
671          *      and we are here.
672          *
673          *      Ideally, this function should stop comparison
674          *      at prefix length. It does not, but it is still OK,
675          *      if returned value is greater than prefix length.
676          *                                      --ANK (980803)
677          */
678         return addrlen << 5;
679 }
680 
681 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
682 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
683 {
684         const __be64 *a1 = token1, *a2 = token2;
685         int i;
686 
687         addrlen >>= 3;
688 
689         for (i = 0; i < addrlen; i++) {
690                 __be64 xb = a1[i] ^ a2[i];
691                 if (xb)
692                         return i * 64 + 63 - __fls(be64_to_cpu(xb));
693         }
694 
695         return addrlen << 6;
696 }
697 #endif
698 
699 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
700 {
701 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
702         if (__builtin_constant_p(addrlen) && !(addrlen & 7))
703                 return __ipv6_addr_diff64(token1, token2, addrlen);
704 #endif
705         return __ipv6_addr_diff32(token1, token2, addrlen);
706 }
707 
708 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
709 {
710         return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
711 }
712 
713 __be32 ipv6_select_ident(struct net *net,
714                          const struct in6_addr *daddr,
715                          const struct in6_addr *saddr);
716 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
717 
718 int ip6_dst_hoplimit(struct dst_entry *dst);
719 
720 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
721                                       struct dst_entry *dst)
722 {
723         int hlimit;
724 
725         if (ipv6_addr_is_multicast(&fl6->daddr))
726                 hlimit = np->mcast_hops;
727         else
728                 hlimit = np->hop_limit;
729         if (hlimit < 0)
730                 hlimit = ip6_dst_hoplimit(dst);
731         return hlimit;
732 }
733 
734 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
735  * Equivalent to :      flow->v6addrs.src = iph->saddr;
736  *                      flow->v6addrs.dst = iph->daddr;
737  */
738 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
739                                             const struct ipv6hdr *iph)
740 {
741         BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
742                      offsetof(typeof(flow->addrs), v6addrs.src) +
743                      sizeof(flow->addrs.v6addrs.src));
744         memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
745         flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
746 }
747 
748 #if IS_ENABLED(CONFIG_IPV6)
749 
750 /* Sysctl settings for net ipv6.auto_flowlabels */
751 #define IP6_AUTO_FLOW_LABEL_OFF         0
752 #define IP6_AUTO_FLOW_LABEL_OPTOUT      1
753 #define IP6_AUTO_FLOW_LABEL_OPTIN       2
754 #define IP6_AUTO_FLOW_LABEL_FORCED      3
755 
756 #define IP6_AUTO_FLOW_LABEL_MAX         IP6_AUTO_FLOW_LABEL_FORCED
757 
758 #define IP6_DEFAULT_AUTO_FLOW_LABELS    IP6_AUTO_FLOW_LABEL_OPTOUT
759 
760 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
761                                         __be32 flowlabel, bool autolabel,
762                                         struct flowi6 *fl6)
763 {
764         u32 hash;
765 
766         if (flowlabel ||
767             net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
768             (!autolabel &&
769              net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
770                 return flowlabel;
771 
772         hash = skb_get_hash_flowi6(skb, fl6);
773 
774         /* Since this is being sent on the wire obfuscate hash a bit
775          * to minimize possbility that any useful information to an
776          * attacker is leaked. Only lower 20 bits are relevant.
777          */
778         rol32(hash, 16);
779 
780         flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
781 
782         if (net->ipv6.sysctl.flowlabel_state_ranges)
783                 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
784 
785         return flowlabel;
786 }
787 
788 static inline int ip6_default_np_autolabel(struct net *net)
789 {
790         switch (net->ipv6.sysctl.auto_flowlabels) {
791         case IP6_AUTO_FLOW_LABEL_OFF:
792         case IP6_AUTO_FLOW_LABEL_OPTIN:
793         default:
794                 return 0;
795         case IP6_AUTO_FLOW_LABEL_OPTOUT:
796         case IP6_AUTO_FLOW_LABEL_FORCED:
797                 return 1;
798         }
799 }
800 #else
801 static inline void ip6_set_txhash(struct sock *sk) { }
802 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
803                                         __be32 flowlabel, bool autolabel,
804                                         struct flowi6 *fl6)
805 {
806         return flowlabel;
807 }
808 static inline int ip6_default_np_autolabel(struct net *net)
809 {
810         return 0;
811 }
812 #endif
813 
814 
815 /*
816  *      Header manipulation
817  */
818 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
819                                 __be32 flowlabel)
820 {
821         *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
822 }
823 
824 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
825 {
826         return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
827 }
828 
829 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
830 {
831         return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
832 }
833 
834 static inline u8 ip6_tclass(__be32 flowinfo)
835 {
836         return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
837 }
838 
839 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
840 {
841         return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
842 }
843 
844 /*
845  *      Prototypes exported by ipv6
846  */
847 
848 /*
849  *      rcv function (called from netdevice level)
850  */
851 
852 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
853              struct packet_type *pt, struct net_device *orig_dev);
854 
855 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
856 
857 /*
858  *      upper-layer output functions
859  */
860 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
861              struct ipv6_txoptions *opt, int tclass);
862 
863 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
864 
865 int ip6_append_data(struct sock *sk,
866                     int getfrag(void *from, char *to, int offset, int len,
867                                 int odd, struct sk_buff *skb),
868                     void *from, int length, int transhdrlen, int hlimit,
869                     int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
870                     struct rt6_info *rt, unsigned int flags, int dontfrag);
871 
872 int ip6_push_pending_frames(struct sock *sk);
873 
874 void ip6_flush_pending_frames(struct sock *sk);
875 
876 int ip6_send_skb(struct sk_buff *skb);
877 
878 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
879                                struct inet_cork_full *cork,
880                                struct inet6_cork *v6_cork);
881 struct sk_buff *ip6_make_skb(struct sock *sk,
882                              int getfrag(void *from, char *to, int offset,
883                                          int len, int odd, struct sk_buff *skb),
884                              void *from, int length, int transhdrlen,
885                              int hlimit, int tclass, struct ipv6_txoptions *opt,
886                              struct flowi6 *fl6, struct rt6_info *rt,
887                              unsigned int flags, int dontfrag);
888 
889 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
890 {
891         return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
892                               &inet6_sk(sk)->cork);
893 }
894 
895 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
896                    struct flowi6 *fl6);
897 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
898                                       const struct in6_addr *final_dst);
899 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
900                                          const struct in6_addr *final_dst);
901 struct dst_entry *ip6_blackhole_route(struct net *net,
902                                       struct dst_entry *orig_dst);
903 
904 /*
905  *      skb processing functions
906  */
907 
908 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
909 int ip6_forward(struct sk_buff *skb);
910 int ip6_input(struct sk_buff *skb);
911 int ip6_mc_input(struct sk_buff *skb);
912 
913 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
914 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
915 
916 /*
917  *      Extension header (options) processing
918  */
919 
920 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
921                           u8 *proto, struct in6_addr **daddr_p);
922 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
923                          u8 *proto);
924 
925 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
926                      __be16 *frag_offp);
927 
928 bool ipv6_ext_hdr(u8 nexthdr);
929 
930 enum {
931         IP6_FH_F_FRAG           = (1 << 0),
932         IP6_FH_F_AUTH           = (1 << 1),
933         IP6_FH_F_SKIP_RH        = (1 << 2),
934 };
935 
936 /* find specified header and get offset to it */
937 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
938                   unsigned short *fragoff, int *fragflg);
939 
940 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
941 
942 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
943                                 const struct ipv6_txoptions *opt,
944                                 struct in6_addr *orig);
945 
946 /*
947  *      socket options (ipv6_sockglue.c)
948  */
949 
950 int ipv6_setsockopt(struct sock *sk, int level, int optname,
951                     char __user *optval, unsigned int optlen);
952 int ipv6_getsockopt(struct sock *sk, int level, int optname,
953                     char __user *optval, int __user *optlen);
954 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
955                            char __user *optval, unsigned int optlen);
956 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
957                            char __user *optval, int __user *optlen);
958 
959 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
960 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
961                                  int addr_len);
962 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
963 void ip6_datagram_release_cb(struct sock *sk);
964 
965 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
966                     int *addr_len);
967 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
968                      int *addr_len);
969 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
970                      u32 info, u8 *payload);
971 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
972 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
973 
974 int inet6_release(struct socket *sock);
975 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
976 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
977                   int peer);
978 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
979 
980 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
981                               struct sock *sk);
982 
983 /*
984  * reassembly.c
985  */
986 extern const struct proto_ops inet6_stream_ops;
987 extern const struct proto_ops inet6_dgram_ops;
988 
989 struct group_source_req;
990 struct group_filter;
991 
992 int ip6_mc_source(int add, int omode, struct sock *sk,
993                   struct group_source_req *pgsr);
994 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
995 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
996                   struct group_filter __user *optval, int __user *optlen);
997 
998 #ifdef CONFIG_PROC_FS
999 int ac6_proc_init(struct net *net);
1000 void ac6_proc_exit(struct net *net);
1001 int raw6_proc_init(void);
1002 void raw6_proc_exit(void);
1003 int tcp6_proc_init(struct net *net);
1004 void tcp6_proc_exit(struct net *net);
1005 int udp6_proc_init(struct net *net);
1006 void udp6_proc_exit(struct net *net);
1007 int udplite6_proc_init(void);
1008 void udplite6_proc_exit(void);
1009 int ipv6_misc_proc_init(void);
1010 void ipv6_misc_proc_exit(void);
1011 int snmp6_register_dev(struct inet6_dev *idev);
1012 int snmp6_unregister_dev(struct inet6_dev *idev);
1013 
1014 #else
1015 static inline int ac6_proc_init(struct net *net) { return 0; }
1016 static inline void ac6_proc_exit(struct net *net) { }
1017 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1018 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1019 #endif
1020 
1021 #ifdef CONFIG_SYSCTL
1022 extern struct ctl_table ipv6_route_table_template[];
1023 
1024 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1025 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1026 int ipv6_sysctl_register(void);
1027 void ipv6_sysctl_unregister(void);
1028 #endif
1029 
1030 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1031                       const struct in6_addr *addr);
1032 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1033                       const struct in6_addr *addr);
1034 #endif /* _NET_IPV6_H */
1035 

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