~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.3 ] ~ [ linux-5.2.15 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.73 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.144 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.193 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.193 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.73 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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, mod, idev, field)                        \
125 ({                                                                      \
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));\
130 })
131 
132 /* per device counters are atomic_long_t */
133 #define _DEVINCATOMIC(net, statname, mod, 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         mod##SNMP_INC_STATS((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, mod, idev, field, val)                   \
151 ({                                                                      \
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));\
156 })
157 
158 #define _DEVUPD(net, statname, mod, idev, field, val)                   \
159 ({                                                                      \
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));\
164 })
165 
166 /* MIBs */
167 
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)
184 
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)
189 
190 struct ip6_ra_chain {
191         struct ip6_ra_chain     *next;
192         struct sock             *sk;
193         int                     sel;
194         void                    (*destructor)(struct sock *);
195 };
196 
197 extern struct ip6_ra_chain      *ip6_ra_chain;
198 extern rwlock_t ip6_ra_lock;
199 
200 /*
201    This structure is prepared by protocol, when parsing
202    ancillary data and passed to IPv6.
203  */
204 
205 struct ipv6_txoptions {
206         atomic_t                refcnt;
207         /* Length of this structure */
208         int                     tot_len;
209 
210         /* length of extension headers   */
211 
212         __u16                   opt_flen;       /* after fragment hdr */
213         __u16                   opt_nflen;      /* before fragment hdr */
214 
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;
219         struct rcu_head         rcu;
220         /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
221 };
222 
223 struct ip6_flowlabel {
224         struct ip6_flowlabel __rcu *next;
225         __be32                  label;
226         atomic_t                users;
227         struct in6_addr         dst;
228         struct ipv6_txoptions   *opt;
229         unsigned long           linger;
230         struct rcu_head         rcu;
231         u8                      share;
232         union {
233                 struct pid *pid;
234                 kuid_t uid;
235         } owner;
236         unsigned long           lastuse;
237         unsigned long           expires;
238         struct net              *fl_net;
239 };
240 
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)
244 
245 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
246 #define IPV6_TCLASS_SHIFT       20
247 
248 struct ipv6_fl_socklist {
249         struct ipv6_fl_socklist __rcu   *next;
250         struct ip6_flowlabel            *fl;
251         struct rcu_head                 rcu;
252 };
253 
254 struct ipcm6_cookie {
255         __s16 hlimit;
256         __s16 tclass;
257         __s8  dontfrag;
258         struct ipv6_txoptions *opt;
259 };
260 
261 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
262 {
263         struct ipv6_txoptions *opt;
264 
265         rcu_read_lock();
266         opt = rcu_dereference(np->opt);
267         if (opt) {
268                 if (!atomic_inc_not_zero(&opt->refcnt))
269                         opt = NULL;
270                 else
271                         opt = rcu_pointer_handoff(opt);
272         }
273         rcu_read_unlock();
274         return opt;
275 }
276 
277 static inline void txopt_put(struct ipv6_txoptions *opt)
278 {
279         if (opt && atomic_dec_and_test(&opt->refcnt))
280                 kfree_rcu(opt, rcu);
281 }
282 
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,
290                            int flags);
291 int ip6_flowlabel_init(void);
292 void ip6_flowlabel_cleanup(void);
293 
294 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
295 {
296         if (fl)
297                 atomic_dec(&fl->users);
298 }
299 
300 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
301 
302 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
303                                struct icmp6hdr *thdr, int len);
304 
305 int ip6_ra_control(struct sock *sk, int sel);
306 
307 int ipv6_parse_hopopts(struct sk_buff *skb);
308 
309 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
310                                         struct ipv6_txoptions *opt);
311 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
312                                           struct ipv6_txoptions *opt,
313                                           int newtype,
314                                           struct ipv6_opt_hdr __user *newopt,
315                                           int newoptlen);
316 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
317                                           struct ipv6_txoptions *opt);
318 
319 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
320                        const struct inet6_skb_parm *opt);
321 
322 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
323 {
324         /* If forwarding is enabled, RA are not accepted unless the special
325          * hybrid mode (accept_ra=2) is enabled.
326          */
327         return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
328             idev->cnf.accept_ra;
329 }
330 
331 #if IS_ENABLED(CONFIG_IPV6)
332 static inline int ip6_frag_mem(struct net *net)
333 {
334         return sum_frag_mem_limit(&net->ipv6.frags);
335 }
336 #endif
337 
338 #define IPV6_FRAG_HIGH_THRESH   (4 * 1024*1024) /* 4194304 */
339 #define IPV6_FRAG_LOW_THRESH    (3 * 1024*1024) /* 3145728 */
340 #define IPV6_FRAG_TIMEOUT       (60 * HZ)       /* 60 seconds */
341 
342 int __ipv6_addr_type(const struct in6_addr *addr);
343 static inline int ipv6_addr_type(const struct in6_addr *addr)
344 {
345         return __ipv6_addr_type(addr) & 0xffff;
346 }
347 
348 static inline int ipv6_addr_scope(const struct in6_addr *addr)
349 {
350         return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
351 }
352 
353 static inline int __ipv6_addr_src_scope(int type)
354 {
355         return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
356 }
357 
358 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
359 {
360         return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
361 }
362 
363 static inline bool __ipv6_addr_needs_scope_id(int type)
364 {
365         return type & IPV6_ADDR_LINKLOCAL ||
366                (type & IPV6_ADDR_MULTICAST &&
367                 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
368 }
369 
370 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
371 {
372         return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
373 }
374 
375 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
376 {
377         return memcmp(a1, a2, sizeof(struct in6_addr));
378 }
379 
380 static inline bool
381 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
382                      const struct in6_addr *a2)
383 {
384 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
385         const unsigned long *ul1 = (const unsigned long *)a1;
386         const unsigned long *ulm = (const unsigned long *)m;
387         const unsigned long *ul2 = (const unsigned long *)a2;
388 
389         return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
390                   ((ul1[1] ^ ul2[1]) & ulm[1]));
391 #else
392         return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
393                   ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
394                   ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
395                   ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
396 #endif
397 }
398 
399 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 
400                                     const struct in6_addr *addr,
401                                     int plen)
402 {
403         /* caller must guarantee 0 <= plen <= 128 */
404         int o = plen >> 3,
405             b = plen & 0x7;
406 
407         memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
408         memcpy(pfx->s6_addr, addr, o);
409         if (b != 0)
410                 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
411 }
412 
413 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
414                                          const struct in6_addr *pfx,
415                                          int plen)
416 {
417         /* caller must guarantee 0 <= plen <= 128 */
418         int o = plen >> 3,
419             b = plen & 0x7;
420 
421         memcpy(addr->s6_addr, pfx, o);
422         if (b != 0) {
423                 addr->s6_addr[o] &= ~(0xff00 >> b);
424                 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
425         }
426 }
427 
428 static inline void __ipv6_addr_set_half(__be32 *addr,
429                                         __be32 wh, __be32 wl)
430 {
431 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
432 #if defined(__BIG_ENDIAN)
433         if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
434                 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
435                 return;
436         }
437 #elif defined(__LITTLE_ENDIAN)
438         if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
439                 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
440                 return;
441         }
442 #endif
443 #endif
444         addr[0] = wh;
445         addr[1] = wl;
446 }
447 
448 static inline void ipv6_addr_set(struct in6_addr *addr, 
449                                      __be32 w1, __be32 w2,
450                                      __be32 w3, __be32 w4)
451 {
452         __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
453         __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
454 }
455 
456 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
457                                    const struct in6_addr *a2)
458 {
459 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
460         const unsigned long *ul1 = (const unsigned long *)a1;
461         const unsigned long *ul2 = (const unsigned long *)a2;
462 
463         return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
464 #else
465         return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
466                 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
467                 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
468                 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
469 #endif
470 }
471 
472 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
473 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
474                                               const __be64 *a2,
475                                               unsigned int len)
476 {
477         if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
478                 return false;
479         return true;
480 }
481 
482 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
483                                      const struct in6_addr *addr2,
484                                      unsigned int prefixlen)
485 {
486         const __be64 *a1 = (const __be64 *)addr1;
487         const __be64 *a2 = (const __be64 *)addr2;
488 
489         if (prefixlen >= 64) {
490                 if (a1[0] ^ a2[0])
491                         return false;
492                 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
493         }
494         return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
495 }
496 #else
497 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
498                                      const struct in6_addr *addr2,
499                                      unsigned int prefixlen)
500 {
501         const __be32 *a1 = addr1->s6_addr32;
502         const __be32 *a2 = addr2->s6_addr32;
503         unsigned int pdw, pbi;
504 
505         /* check complete u32 in prefix */
506         pdw = prefixlen >> 5;
507         if (pdw && memcmp(a1, a2, pdw << 2))
508                 return false;
509 
510         /* check incomplete u32 in prefix */
511         pbi = prefixlen & 0x1f;
512         if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
513                 return false;
514 
515         return true;
516 }
517 #endif
518 
519 struct inet_frag_queue;
520 
521 enum ip6_defrag_users {
522         IP6_DEFRAG_LOCAL_DELIVER,
523         IP6_DEFRAG_CONNTRACK_IN,
524         __IP6_DEFRAG_CONNTRACK_IN       = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
525         IP6_DEFRAG_CONNTRACK_OUT,
526         __IP6_DEFRAG_CONNTRACK_OUT      = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
527         IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
528         __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
529 };
530 
531 struct ip6_create_arg {
532         __be32 id;
533         u32 user;
534         const struct in6_addr *src;
535         const struct in6_addr *dst;
536         int iif;
537         u8 ecn;
538 };
539 
540 void ip6_frag_init(struct inet_frag_queue *q, const void *a);
541 bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
542 
543 /*
544  *      Equivalent of ipv4 struct ip
545  */
546 struct frag_queue {
547         struct inet_frag_queue  q;
548 
549         __be32                  id;             /* fragment id          */
550         u32                     user;
551         struct in6_addr         saddr;
552         struct in6_addr         daddr;
553 
554         int                     iif;
555         unsigned int            csum;
556         __u16                   nhoffset;
557         u8                      ecn;
558 };
559 
560 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
561                            struct inet_frags *frags);
562 
563 static inline bool ipv6_addr_any(const struct in6_addr *a)
564 {
565 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
566         const unsigned long *ul = (const unsigned long *)a;
567 
568         return (ul[0] | ul[1]) == 0UL;
569 #else
570         return (a->s6_addr32[0] | a->s6_addr32[1] |
571                 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
572 #endif
573 }
574 
575 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
576 {
577 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
578         const unsigned long *ul = (const unsigned long *)a;
579         unsigned long x = ul[0] ^ ul[1];
580 
581         return (u32)(x ^ (x >> 32));
582 #else
583         return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
584                              a->s6_addr32[2] ^ a->s6_addr32[3]);
585 #endif
586 }
587 
588 /* more secured version of ipv6_addr_hash() */
589 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
590 {
591         u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
592 
593         return jhash_3words(v,
594                             (__force u32)a->s6_addr32[2],
595                             (__force u32)a->s6_addr32[3],
596                             initval);
597 }
598 
599 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
600 {
601 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
602         const __be64 *be = (const __be64 *)a;
603 
604         return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
605 #else
606         return (a->s6_addr32[0] | a->s6_addr32[1] |
607                 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
608 #endif
609 }
610 
611 /*
612  * Note that we must __force cast these to unsigned long to make sparse happy,
613  * since all of the endian-annotated types are fixed size regardless of arch.
614  */
615 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
616 {
617         return (
618 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
619                 *(unsigned long *)a |
620 #else
621                 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
622 #endif
623                 (__force unsigned long)(a->s6_addr32[2] ^
624                                         cpu_to_be32(0x0000ffff))) == 0UL;
625 }
626 
627 /*
628  * Check for a RFC 4843 ORCHID address
629  * (Overlay Routable Cryptographic Hash Identifiers)
630  */
631 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
632 {
633         return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
634 }
635 
636 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
637 {
638         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
639 }
640 
641 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
642                                           struct in6_addr *v4mapped)
643 {
644         ipv6_addr_set(v4mapped,
645                         0, 0,
646                         htonl(0x0000FFFF),
647                         addr);
648 }
649 
650 /*
651  * find the first different bit between two addresses
652  * length of address must be a multiple of 32bits
653  */
654 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
655 {
656         const __be32 *a1 = token1, *a2 = token2;
657         int i;
658 
659         addrlen >>= 2;
660 
661         for (i = 0; i < addrlen; i++) {
662                 __be32 xb = a1[i] ^ a2[i];
663                 if (xb)
664                         return i * 32 + 31 - __fls(ntohl(xb));
665         }
666 
667         /*
668          *      we should *never* get to this point since that 
669          *      would mean the addrs are equal
670          *
671          *      However, we do get to it 8) And exacly, when
672          *      addresses are equal 8)
673          *
674          *      ip route add 1111::/128 via ...
675          *      ip route add 1111::/64 via ...
676          *      and we are here.
677          *
678          *      Ideally, this function should stop comparison
679          *      at prefix length. It does not, but it is still OK,
680          *      if returned value is greater than prefix length.
681          *                                      --ANK (980803)
682          */
683         return addrlen << 5;
684 }
685 
686 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
687 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
688 {
689         const __be64 *a1 = token1, *a2 = token2;
690         int i;
691 
692         addrlen >>= 3;
693 
694         for (i = 0; i < addrlen; i++) {
695                 __be64 xb = a1[i] ^ a2[i];
696                 if (xb)
697                         return i * 64 + 63 - __fls(be64_to_cpu(xb));
698         }
699 
700         return addrlen << 6;
701 }
702 #endif
703 
704 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
705 {
706 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
707         if (__builtin_constant_p(addrlen) && !(addrlen & 7))
708                 return __ipv6_addr_diff64(token1, token2, addrlen);
709 #endif
710         return __ipv6_addr_diff32(token1, token2, addrlen);
711 }
712 
713 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
714 {
715         return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
716 }
717 
718 __be32 ipv6_select_ident(struct net *net,
719                          const struct in6_addr *daddr,
720                          const struct in6_addr *saddr);
721 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
722 
723 int ip6_dst_hoplimit(struct dst_entry *dst);
724 
725 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
726                                       struct dst_entry *dst)
727 {
728         int hlimit;
729 
730         if (ipv6_addr_is_multicast(&fl6->daddr))
731                 hlimit = np->mcast_hops;
732         else
733                 hlimit = np->hop_limit;
734         if (hlimit < 0)
735                 hlimit = ip6_dst_hoplimit(dst);
736         return hlimit;
737 }
738 
739 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
740  * Equivalent to :      flow->v6addrs.src = iph->saddr;
741  *                      flow->v6addrs.dst = iph->daddr;
742  */
743 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
744                                             const struct ipv6hdr *iph)
745 {
746         BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
747                      offsetof(typeof(flow->addrs), v6addrs.src) +
748                      sizeof(flow->addrs.v6addrs.src));
749         memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
750         flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
751 }
752 
753 #if IS_ENABLED(CONFIG_IPV6)
754 
755 /* Sysctl settings for net ipv6.auto_flowlabels */
756 #define IP6_AUTO_FLOW_LABEL_OFF         0
757 #define IP6_AUTO_FLOW_LABEL_OPTOUT      1
758 #define IP6_AUTO_FLOW_LABEL_OPTIN       2
759 #define IP6_AUTO_FLOW_LABEL_FORCED      3
760 
761 #define IP6_AUTO_FLOW_LABEL_MAX         IP6_AUTO_FLOW_LABEL_FORCED
762 
763 #define IP6_DEFAULT_AUTO_FLOW_LABELS    IP6_AUTO_FLOW_LABEL_OPTOUT
764 
765 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
766                                         __be32 flowlabel, bool autolabel,
767                                         struct flowi6 *fl6)
768 {
769         u32 hash;
770 
771         if (flowlabel ||
772             net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
773             (!autolabel &&
774              net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
775                 return flowlabel;
776 
777         hash = skb_get_hash_flowi6(skb, fl6);
778 
779         /* Since this is being sent on the wire obfuscate hash a bit
780          * to minimize possbility that any useful information to an
781          * attacker is leaked. Only lower 20 bits are relevant.
782          */
783         rol32(hash, 16);
784 
785         flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
786 
787         if (net->ipv6.sysctl.flowlabel_state_ranges)
788                 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
789 
790         return flowlabel;
791 }
792 
793 static inline int ip6_default_np_autolabel(struct net *net)
794 {
795         switch (net->ipv6.sysctl.auto_flowlabels) {
796         case IP6_AUTO_FLOW_LABEL_OFF:
797         case IP6_AUTO_FLOW_LABEL_OPTIN:
798         default:
799                 return 0;
800         case IP6_AUTO_FLOW_LABEL_OPTOUT:
801         case IP6_AUTO_FLOW_LABEL_FORCED:
802                 return 1;
803         }
804 }
805 #else
806 static inline void ip6_set_txhash(struct sock *sk) { }
807 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
808                                         __be32 flowlabel, bool autolabel,
809                                         struct flowi6 *fl6)
810 {
811         return flowlabel;
812 }
813 static inline int ip6_default_np_autolabel(struct net *net)
814 {
815         return 0;
816 }
817 #endif
818 
819 
820 /*
821  *      Header manipulation
822  */
823 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
824                                 __be32 flowlabel)
825 {
826         *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
827 }
828 
829 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
830 {
831         return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
832 }
833 
834 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
835 {
836         return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
837 }
838 
839 static inline u8 ip6_tclass(__be32 flowinfo)
840 {
841         return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
842 }
843 
844 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
845 {
846         return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
847 }
848 
849 /*
850  *      Prototypes exported by ipv6
851  */
852 
853 /*
854  *      rcv function (called from netdevice level)
855  */
856 
857 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
858              struct packet_type *pt, struct net_device *orig_dev);
859 
860 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
861 
862 /*
863  *      upper-layer output functions
864  */
865 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
866              struct ipv6_txoptions *opt, int tclass);
867 
868 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
869 
870 int ip6_append_data(struct sock *sk,
871                     int getfrag(void *from, char *to, int offset, int len,
872                                 int odd, struct sk_buff *skb),
873                     void *from, int length, int transhdrlen,
874                     struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
875                     struct rt6_info *rt, unsigned int flags,
876                     const struct sockcm_cookie *sockc);
877 
878 int ip6_push_pending_frames(struct sock *sk);
879 
880 void ip6_flush_pending_frames(struct sock *sk);
881 
882 int ip6_send_skb(struct sk_buff *skb);
883 
884 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
885                                struct inet_cork_full *cork,
886                                struct inet6_cork *v6_cork);
887 struct sk_buff *ip6_make_skb(struct sock *sk,
888                              int getfrag(void *from, char *to, int offset,
889                                          int len, int odd, struct sk_buff *skb),
890                              void *from, int length, int transhdrlen,
891                              struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
892                              struct rt6_info *rt, unsigned int flags,
893                              const struct sockcm_cookie *sockc);
894 
895 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
896 {
897         return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
898                               &inet6_sk(sk)->cork);
899 }
900 
901 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
902                    struct flowi6 *fl6);
903 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
904                                       const struct in6_addr *final_dst);
905 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
906                                          const struct in6_addr *final_dst);
907 struct dst_entry *ip6_blackhole_route(struct net *net,
908                                       struct dst_entry *orig_dst);
909 
910 /*
911  *      skb processing functions
912  */
913 
914 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
915 int ip6_forward(struct sk_buff *skb);
916 int ip6_input(struct sk_buff *skb);
917 int ip6_mc_input(struct sk_buff *skb);
918 
919 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
920 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
921 
922 /*
923  *      Extension header (options) processing
924  */
925 
926 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
927                           u8 *proto, struct in6_addr **daddr_p);
928 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
929                          u8 *proto);
930 
931 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
932                      __be16 *frag_offp);
933 
934 bool ipv6_ext_hdr(u8 nexthdr);
935 
936 enum {
937         IP6_FH_F_FRAG           = (1 << 0),
938         IP6_FH_F_AUTH           = (1 << 1),
939         IP6_FH_F_SKIP_RH        = (1 << 2),
940 };
941 
942 /* find specified header and get offset to it */
943 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
944                   unsigned short *fragoff, int *fragflg);
945 
946 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
947 
948 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
949                                 const struct ipv6_txoptions *opt,
950                                 struct in6_addr *orig);
951 
952 /*
953  *      socket options (ipv6_sockglue.c)
954  */
955 
956 int ipv6_setsockopt(struct sock *sk, int level, int optname,
957                     char __user *optval, unsigned int optlen);
958 int ipv6_getsockopt(struct sock *sk, int level, int optname,
959                     char __user *optval, int __user *optlen);
960 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
961                            char __user *optval, unsigned int optlen);
962 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
963                            char __user *optval, int __user *optlen);
964 
965 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
966 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
967                                  int addr_len);
968 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
969 void ip6_datagram_release_cb(struct sock *sk);
970 
971 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
972                     int *addr_len);
973 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
974                      int *addr_len);
975 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
976                      u32 info, u8 *payload);
977 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
978 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
979 
980 int inet6_release(struct socket *sock);
981 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
982 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
983                   int peer);
984 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
985 
986 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
987                               struct sock *sk);
988 
989 /*
990  * reassembly.c
991  */
992 extern const struct proto_ops inet6_stream_ops;
993 extern const struct proto_ops inet6_dgram_ops;
994 
995 struct group_source_req;
996 struct group_filter;
997 
998 int ip6_mc_source(int add, int omode, struct sock *sk,
999                   struct group_source_req *pgsr);
1000 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
1001 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1002                   struct group_filter __user *optval, int __user *optlen);
1003 
1004 #ifdef CONFIG_PROC_FS
1005 int ac6_proc_init(struct net *net);
1006 void ac6_proc_exit(struct net *net);
1007 int raw6_proc_init(void);
1008 void raw6_proc_exit(void);
1009 int tcp6_proc_init(struct net *net);
1010 void tcp6_proc_exit(struct net *net);
1011 int udp6_proc_init(struct net *net);
1012 void udp6_proc_exit(struct net *net);
1013 int udplite6_proc_init(void);
1014 void udplite6_proc_exit(void);
1015 int ipv6_misc_proc_init(void);
1016 void ipv6_misc_proc_exit(void);
1017 int snmp6_register_dev(struct inet6_dev *idev);
1018 int snmp6_unregister_dev(struct inet6_dev *idev);
1019 
1020 #else
1021 static inline int ac6_proc_init(struct net *net) { return 0; }
1022 static inline void ac6_proc_exit(struct net *net) { }
1023 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1024 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1025 #endif
1026 
1027 #ifdef CONFIG_SYSCTL
1028 extern struct ctl_table ipv6_route_table_template[];
1029 
1030 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1031 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1032 int ipv6_sysctl_register(void);
1033 void ipv6_sysctl_unregister(void);
1034 #endif
1035 
1036 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1037                       const struct in6_addr *addr);
1038 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1039                       const struct in6_addr *addr);
1040 #endif /* _NET_IPV6_H */
1041 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp