Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0-or-later */
2 : /*
3 : * Linux INET6 implementation
4 : *
5 : * Authors:
6 : * Pedro Roque <roque@di.fc.ul.pt>
7 : */
8 :
9 : #ifndef _NET_IPV6_H
10 : #define _NET_IPV6_H
11 :
12 : #include <linux/ipv6.h>
13 : #include <linux/hardirq.h>
14 : #include <linux/jhash.h>
15 : #include <linux/refcount.h>
16 : #include <linux/jump_label_ratelimit.h>
17 : #include <net/if_inet6.h>
18 : #include <net/flow.h>
19 : #include <net/flow_dissector.h>
20 : #include <net/inet_dscp.h>
21 : #include <net/snmp.h>
22 : #include <net/netns/hash.h>
23 :
24 : struct ip_tunnel_info;
25 :
26 : #define SIN6_LEN_RFC2133 24
27 :
28 : #define IPV6_MAXPLEN 65535
29 :
30 : /*
31 : * NextHeader field of IPv6 header
32 : */
33 :
34 : #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
35 : #define NEXTHDR_IPV4 4 /* IPv4 in IPv6 */
36 : #define NEXTHDR_TCP 6 /* TCP segment. */
37 : #define NEXTHDR_UDP 17 /* UDP message. */
38 : #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
39 : #define NEXTHDR_ROUTING 43 /* Routing header. */
40 : #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
41 : #define NEXTHDR_GRE 47 /* GRE header. */
42 : #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
43 : #define NEXTHDR_AUTH 51 /* Authentication header. */
44 : #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
45 : #define NEXTHDR_NONE 59 /* No next header */
46 : #define NEXTHDR_DEST 60 /* Destination options header. */
47 : #define NEXTHDR_SCTP 132 /* SCTP message. */
48 : #define NEXTHDR_MOBILITY 135 /* Mobility header. */
49 :
50 : #define NEXTHDR_MAX 255
51 :
52 : #define IPV6_DEFAULT_HOPLIMIT 64
53 : #define IPV6_DEFAULT_MCASTHOPS 1
54 :
55 : /* Limits on Hop-by-Hop and Destination options.
56 : *
57 : * Per RFC8200 there is no limit on the maximum number or lengths of options in
58 : * Hop-by-Hop or Destination options other then the packet must fit in an MTU.
59 : * We allow configurable limits in order to mitigate potential denial of
60 : * service attacks.
61 : *
62 : * There are three limits that may be set:
63 : * - Limit the number of options in a Hop-by-Hop or Destination options
64 : * extension header
65 : * - Limit the byte length of a Hop-by-Hop or Destination options extension
66 : * header
67 : * - Disallow unknown options
68 : *
69 : * The limits are expressed in corresponding sysctls:
70 : *
71 : * ipv6.sysctl.max_dst_opts_cnt
72 : * ipv6.sysctl.max_hbh_opts_cnt
73 : * ipv6.sysctl.max_dst_opts_len
74 : * ipv6.sysctl.max_hbh_opts_len
75 : *
76 : * max_*_opts_cnt is the number of TLVs that are allowed for Destination
77 : * options or Hop-by-Hop options. If the number is less than zero then unknown
78 : * TLVs are disallowed and the number of known options that are allowed is the
79 : * absolute value. Setting the value to INT_MAX indicates no limit.
80 : *
81 : * max_*_opts_len is the length limit in bytes of a Destination or
82 : * Hop-by-Hop options extension header. Setting the value to INT_MAX
83 : * indicates no length limit.
84 : *
85 : * If a limit is exceeded when processing an extension header the packet is
86 : * silently discarded.
87 : */
88 :
89 : /* Default limits for Hop-by-Hop and Destination options */
90 : #define IP6_DEFAULT_MAX_DST_OPTS_CNT 8
91 : #define IP6_DEFAULT_MAX_HBH_OPTS_CNT 8
92 : #define IP6_DEFAULT_MAX_DST_OPTS_LEN INT_MAX /* No limit */
93 : #define IP6_DEFAULT_MAX_HBH_OPTS_LEN INT_MAX /* No limit */
94 :
95 : /*
96 : * Addr type
97 : *
98 : * type - unicast | multicast
99 : * scope - local | site | global
100 : * v4 - compat
101 : * v4mapped
102 : * any
103 : * loopback
104 : */
105 :
106 : #define IPV6_ADDR_ANY 0x0000U
107 :
108 : #define IPV6_ADDR_UNICAST 0x0001U
109 : #define IPV6_ADDR_MULTICAST 0x0002U
110 :
111 : #define IPV6_ADDR_LOOPBACK 0x0010U
112 : #define IPV6_ADDR_LINKLOCAL 0x0020U
113 : #define IPV6_ADDR_SITELOCAL 0x0040U
114 :
115 : #define IPV6_ADDR_COMPATv4 0x0080U
116 :
117 : #define IPV6_ADDR_SCOPE_MASK 0x00f0U
118 :
119 : #define IPV6_ADDR_MAPPED 0x1000U
120 :
121 : /*
122 : * Addr scopes
123 : */
124 : #define IPV6_ADDR_MC_SCOPE(a) \
125 : ((a)->s6_addr[1] & 0x0f) /* nonstandard */
126 : #define __IPV6_ADDR_SCOPE_INVALID -1
127 : #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
128 : #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
129 : #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
130 : #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
131 : #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
132 :
133 : /*
134 : * Addr flags
135 : */
136 : #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
137 : ((a)->s6_addr[1] & 0x10)
138 : #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
139 : ((a)->s6_addr[1] & 0x20)
140 : #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
141 : ((a)->s6_addr[1] & 0x40)
142 :
143 : /*
144 : * fragmentation header
145 : */
146 :
147 : struct frag_hdr {
148 : __u8 nexthdr;
149 : __u8 reserved;
150 : __be16 frag_off;
151 : __be32 identification;
152 : };
153 :
154 : /*
155 : * Jumbo payload option, as described in RFC 2675 2.
156 : */
157 : struct hop_jumbo_hdr {
158 : u8 nexthdr;
159 : u8 hdrlen;
160 : u8 tlv_type; /* IPV6_TLV_JUMBO, 0xC2 */
161 : u8 tlv_len; /* 4 */
162 : __be32 jumbo_payload_len;
163 : };
164 :
165 : #define IP6_MF 0x0001
166 : #define IP6_OFFSET 0xFFF8
167 :
168 : struct ip6_fraglist_iter {
169 : struct ipv6hdr *tmp_hdr;
170 : struct sk_buff *frag;
171 : int offset;
172 : unsigned int hlen;
173 : __be32 frag_id;
174 : u8 nexthdr;
175 : };
176 :
177 : int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr,
178 : u8 nexthdr, __be32 frag_id,
179 : struct ip6_fraglist_iter *iter);
180 : void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter);
181 :
182 : static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter)
183 : {
184 : struct sk_buff *skb = iter->frag;
185 :
186 : iter->frag = skb->next;
187 : skb_mark_not_on_list(skb);
188 :
189 : return skb;
190 : }
191 :
192 : struct ip6_frag_state {
193 : u8 *prevhdr;
194 : unsigned int hlen;
195 : unsigned int mtu;
196 : unsigned int left;
197 : int offset;
198 : int ptr;
199 : int hroom;
200 : int troom;
201 : __be32 frag_id;
202 : u8 nexthdr;
203 : };
204 :
205 : void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu,
206 : unsigned short needed_tailroom, int hdr_room, u8 *prevhdr,
207 : u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state);
208 : struct sk_buff *ip6_frag_next(struct sk_buff *skb,
209 : struct ip6_frag_state *state);
210 :
211 : #define IP6_REPLY_MARK(net, mark) \
212 : ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
213 :
214 : #include <net/sock.h>
215 :
216 : /* sysctls */
217 : extern int sysctl_mld_max_msf;
218 : extern int sysctl_mld_qrv;
219 :
220 : #define _DEVINC(net, statname, mod, idev, field) \
221 : ({ \
222 : struct inet6_dev *_idev = (idev); \
223 : if (likely(_idev != NULL)) \
224 : mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
225 : mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
226 : })
227 :
228 : /* per device counters are atomic_long_t */
229 : #define _DEVINCATOMIC(net, statname, mod, idev, field) \
230 : ({ \
231 : struct inet6_dev *_idev = (idev); \
232 : if (likely(_idev != NULL)) \
233 : SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
234 : mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
235 : })
236 :
237 : /* per device and per net counters are atomic_long_t */
238 : #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
239 : ({ \
240 : struct inet6_dev *_idev = (idev); \
241 : if (likely(_idev != NULL)) \
242 : SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
243 : SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
244 : })
245 :
246 : #define _DEVADD(net, statname, mod, idev, field, val) \
247 : ({ \
248 : struct inet6_dev *_idev = (idev); \
249 : if (likely(_idev != NULL)) \
250 : mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
251 : mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
252 : })
253 :
254 : #define _DEVUPD(net, statname, mod, idev, field, val) \
255 : ({ \
256 : struct inet6_dev *_idev = (idev); \
257 : if (likely(_idev != NULL)) \
258 : mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
259 : mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
260 : })
261 :
262 : /* MIBs */
263 :
264 : #define IP6_INC_STATS(net, idev,field) \
265 : _DEVINC(net, ipv6, , idev, field)
266 : #define __IP6_INC_STATS(net, idev,field) \
267 : _DEVINC(net, ipv6, __, idev, field)
268 : #define IP6_ADD_STATS(net, idev,field,val) \
269 : _DEVADD(net, ipv6, , idev, field, val)
270 : #define __IP6_ADD_STATS(net, idev,field,val) \
271 : _DEVADD(net, ipv6, __, idev, field, val)
272 : #define IP6_UPD_PO_STATS(net, idev,field,val) \
273 : _DEVUPD(net, ipv6, , idev, field, val)
274 : #define __IP6_UPD_PO_STATS(net, idev,field,val) \
275 : _DEVUPD(net, ipv6, __, idev, field, val)
276 : #define ICMP6_INC_STATS(net, idev, field) \
277 : _DEVINCATOMIC(net, icmpv6, , idev, field)
278 : #define __ICMP6_INC_STATS(net, idev, field) \
279 : _DEVINCATOMIC(net, icmpv6, __, idev, field)
280 :
281 : #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
282 : _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
283 : #define ICMP6MSGIN_INC_STATS(net, idev, field) \
284 : _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
285 :
286 : struct ip6_ra_chain {
287 : struct ip6_ra_chain *next;
288 : struct sock *sk;
289 : int sel;
290 : void (*destructor)(struct sock *);
291 : };
292 :
293 : extern struct ip6_ra_chain *ip6_ra_chain;
294 : extern rwlock_t ip6_ra_lock;
295 :
296 : /*
297 : This structure is prepared by protocol, when parsing
298 : ancillary data and passed to IPv6.
299 : */
300 :
301 : struct ipv6_txoptions {
302 : refcount_t refcnt;
303 : /* Length of this structure */
304 : int tot_len;
305 :
306 : /* length of extension headers */
307 :
308 : __u16 opt_flen; /* after fragment hdr */
309 : __u16 opt_nflen; /* before fragment hdr */
310 :
311 : struct ipv6_opt_hdr *hopopt;
312 : struct ipv6_opt_hdr *dst0opt;
313 : struct ipv6_rt_hdr *srcrt; /* Routing Header */
314 : struct ipv6_opt_hdr *dst1opt;
315 : struct rcu_head rcu;
316 : /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
317 : };
318 :
319 : /* flowlabel_reflect sysctl values */
320 : enum flowlabel_reflect {
321 : FLOWLABEL_REFLECT_ESTABLISHED = 1,
322 : FLOWLABEL_REFLECT_TCP_RESET = 2,
323 : FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4,
324 : };
325 :
326 : struct ip6_flowlabel {
327 : struct ip6_flowlabel __rcu *next;
328 : __be32 label;
329 : atomic_t users;
330 : struct in6_addr dst;
331 : struct ipv6_txoptions *opt;
332 : unsigned long linger;
333 : struct rcu_head rcu;
334 : u8 share;
335 : union {
336 : struct pid *pid;
337 : kuid_t uid;
338 : } owner;
339 : unsigned long lastuse;
340 : unsigned long expires;
341 : struct net *fl_net;
342 : };
343 :
344 : #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
345 : #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
346 : #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
347 :
348 : #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
349 : #define IPV6_TCLASS_SHIFT 20
350 :
351 : struct ipv6_fl_socklist {
352 : struct ipv6_fl_socklist __rcu *next;
353 : struct ip6_flowlabel *fl;
354 : struct rcu_head rcu;
355 : };
356 :
357 : struct ipcm6_cookie {
358 : struct sockcm_cookie sockc;
359 : __s16 hlimit;
360 : __s16 tclass;
361 : __u16 gso_size;
362 : __s8 dontfrag;
363 : struct ipv6_txoptions *opt;
364 : };
365 :
366 : static inline void ipcm6_init(struct ipcm6_cookie *ipc6)
367 : {
368 : *ipc6 = (struct ipcm6_cookie) {
369 : .hlimit = -1,
370 : .tclass = -1,
371 : .dontfrag = -1,
372 : };
373 : }
374 :
375 : static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6,
376 : const struct ipv6_pinfo *np)
377 : {
378 : *ipc6 = (struct ipcm6_cookie) {
379 : .hlimit = -1,
380 : .tclass = np->tclass,
381 : .dontfrag = np->dontfrag,
382 : };
383 : }
384 :
385 : static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
386 : {
387 : struct ipv6_txoptions *opt;
388 :
389 : rcu_read_lock();
390 : opt = rcu_dereference(np->opt);
391 : if (opt) {
392 : if (!refcount_inc_not_zero(&opt->refcnt))
393 : opt = NULL;
394 : else
395 : opt = rcu_pointer_handoff(opt);
396 : }
397 : rcu_read_unlock();
398 : return opt;
399 : }
400 :
401 : static inline void txopt_put(struct ipv6_txoptions *opt)
402 : {
403 : if (opt && refcount_dec_and_test(&opt->refcnt))
404 : kfree_rcu(opt, rcu);
405 : }
406 :
407 : #if IS_ENABLED(CONFIG_IPV6)
408 : struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label);
409 :
410 : extern struct static_key_false_deferred ipv6_flowlabel_exclusive;
411 : static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk,
412 : __be32 label)
413 : {
414 : if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key) &&
415 : READ_ONCE(sock_net(sk)->ipv6.flowlabel_has_excl))
416 : return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT);
417 :
418 : return NULL;
419 : }
420 : #endif
421 :
422 : struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
423 : struct ip6_flowlabel *fl,
424 : struct ipv6_txoptions *fopt);
425 : void fl6_free_socklist(struct sock *sk);
426 : int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen);
427 : int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
428 : int flags);
429 : int ip6_flowlabel_init(void);
430 : void ip6_flowlabel_cleanup(void);
431 : bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
432 :
433 : static inline void fl6_sock_release(struct ip6_flowlabel *fl)
434 : {
435 : if (fl)
436 : atomic_dec(&fl->users);
437 : }
438 :
439 : enum skb_drop_reason icmpv6_notify(struct sk_buff *skb, u8 type,
440 : u8 code, __be32 info);
441 :
442 : void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
443 : struct icmp6hdr *thdr, int len);
444 :
445 : int ip6_ra_control(struct sock *sk, int sel);
446 :
447 : int ipv6_parse_hopopts(struct sk_buff *skb);
448 :
449 : struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
450 : struct ipv6_txoptions *opt);
451 : struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
452 : struct ipv6_txoptions *opt,
453 : int newtype,
454 : struct ipv6_opt_hdr *newopt);
455 : struct ipv6_txoptions *__ipv6_fixup_options(struct ipv6_txoptions *opt_space,
456 : struct ipv6_txoptions *opt);
457 :
458 : static inline struct ipv6_txoptions *
459 : ipv6_fixup_options(struct ipv6_txoptions *opt_space, struct ipv6_txoptions *opt)
460 : {
461 : if (!opt)
462 : return NULL;
463 : return __ipv6_fixup_options(opt_space, opt);
464 : }
465 :
466 : bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
467 : const struct inet6_skb_parm *opt);
468 : struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
469 : struct ipv6_txoptions *opt);
470 :
471 : /* This helper is specialized for BIG TCP needs.
472 : * It assumes the hop_jumbo_hdr will immediately follow the IPV6 header.
473 : * It assumes headers are already in skb->head.
474 : * Returns 0, or IPPROTO_TCP if a BIG TCP packet is there.
475 : */
476 : static inline int ipv6_has_hopopt_jumbo(const struct sk_buff *skb)
477 : {
478 : const struct hop_jumbo_hdr *jhdr;
479 : const struct ipv6hdr *nhdr;
480 :
481 : if (likely(skb->len <= GRO_LEGACY_MAX_SIZE))
482 : return 0;
483 :
484 : if (skb->protocol != htons(ETH_P_IPV6))
485 : return 0;
486 :
487 : if (skb_network_offset(skb) +
488 : sizeof(struct ipv6hdr) +
489 : sizeof(struct hop_jumbo_hdr) > skb_headlen(skb))
490 : return 0;
491 :
492 : nhdr = ipv6_hdr(skb);
493 :
494 : if (nhdr->nexthdr != NEXTHDR_HOP)
495 : return 0;
496 :
497 : jhdr = (const struct hop_jumbo_hdr *) (nhdr + 1);
498 : if (jhdr->tlv_type != IPV6_TLV_JUMBO || jhdr->hdrlen != 0 ||
499 : jhdr->nexthdr != IPPROTO_TCP)
500 : return 0;
501 : return jhdr->nexthdr;
502 : }
503 :
504 : /* Return 0 if HBH header is successfully removed
505 : * Or if HBH removal is unnecessary (packet is not big TCP)
506 : * Return error to indicate dropping the packet
507 : */
508 : static inline int ipv6_hopopt_jumbo_remove(struct sk_buff *skb)
509 : {
510 : const int hophdr_len = sizeof(struct hop_jumbo_hdr);
511 : int nexthdr = ipv6_has_hopopt_jumbo(skb);
512 : struct ipv6hdr *h6;
513 :
514 : if (!nexthdr)
515 : return 0;
516 :
517 : if (skb_cow_head(skb, 0))
518 : return -1;
519 :
520 : /* Remove the HBH header.
521 : * Layout: [Ethernet header][IPv6 header][HBH][L4 Header]
522 : */
523 : memmove(skb_mac_header(skb) + hophdr_len, skb_mac_header(skb),
524 : skb_network_header(skb) - skb_mac_header(skb) +
525 : sizeof(struct ipv6hdr));
526 :
527 : __skb_pull(skb, hophdr_len);
528 : skb->network_header += hophdr_len;
529 : skb->mac_header += hophdr_len;
530 :
531 : h6 = ipv6_hdr(skb);
532 : h6->nexthdr = nexthdr;
533 :
534 : return 0;
535 : }
536 :
537 : static inline bool ipv6_accept_ra(struct inet6_dev *idev)
538 : {
539 : /* If forwarding is enabled, RA are not accepted unless the special
540 : * hybrid mode (accept_ra=2) is enabled.
541 : */
542 : return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
543 : idev->cnf.accept_ra;
544 : }
545 :
546 : #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
547 : #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
548 : #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
549 :
550 : int __ipv6_addr_type(const struct in6_addr *addr);
551 : static inline int ipv6_addr_type(const struct in6_addr *addr)
552 : {
553 : return __ipv6_addr_type(addr) & 0xffff;
554 : }
555 :
556 : static inline int ipv6_addr_scope(const struct in6_addr *addr)
557 : {
558 : return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
559 : }
560 :
561 : static inline int __ipv6_addr_src_scope(int type)
562 : {
563 : return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
564 : }
565 :
566 : static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
567 : {
568 : return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
569 : }
570 :
571 : static inline bool __ipv6_addr_needs_scope_id(int type)
572 : {
573 : return type & IPV6_ADDR_LINKLOCAL ||
574 : (type & IPV6_ADDR_MULTICAST &&
575 : (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
576 : }
577 :
578 : static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
579 : {
580 : return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
581 : }
582 :
583 : static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
584 : {
585 : return memcmp(a1, a2, sizeof(struct in6_addr));
586 : }
587 :
588 : static inline bool
589 : ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
590 : const struct in6_addr *a2)
591 : {
592 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
593 : const unsigned long *ul1 = (const unsigned long *)a1;
594 : const unsigned long *ulm = (const unsigned long *)m;
595 : const unsigned long *ul2 = (const unsigned long *)a2;
596 :
597 : return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
598 : ((ul1[1] ^ ul2[1]) & ulm[1]));
599 : #else
600 : return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
601 : ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
602 : ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
603 : ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
604 : #endif
605 : }
606 :
607 : static inline void ipv6_addr_prefix(struct in6_addr *pfx,
608 : const struct in6_addr *addr,
609 : int plen)
610 : {
611 : /* caller must guarantee 0 <= plen <= 128 */
612 : int o = plen >> 3,
613 : b = plen & 0x7;
614 :
615 : memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
616 : memcpy(pfx->s6_addr, addr, o);
617 : if (b != 0)
618 : pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
619 : }
620 :
621 : static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
622 : const struct in6_addr *pfx,
623 : int plen)
624 : {
625 : /* caller must guarantee 0 <= plen <= 128 */
626 : int o = plen >> 3,
627 : b = plen & 0x7;
628 :
629 : memcpy(addr->s6_addr, pfx, o);
630 : if (b != 0) {
631 : addr->s6_addr[o] &= ~(0xff00 >> b);
632 : addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
633 : }
634 : }
635 :
636 : static inline void __ipv6_addr_set_half(__be32 *addr,
637 : __be32 wh, __be32 wl)
638 : {
639 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
640 : #if defined(__BIG_ENDIAN)
641 : if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
642 : *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
643 : return;
644 : }
645 : #elif defined(__LITTLE_ENDIAN)
646 : if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
647 : *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
648 : return;
649 : }
650 : #endif
651 : #endif
652 : addr[0] = wh;
653 : addr[1] = wl;
654 : }
655 :
656 : static inline void ipv6_addr_set(struct in6_addr *addr,
657 : __be32 w1, __be32 w2,
658 : __be32 w3, __be32 w4)
659 : {
660 : __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
661 : __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
662 : }
663 :
664 : static inline bool ipv6_addr_equal(const struct in6_addr *a1,
665 : const struct in6_addr *a2)
666 : {
667 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
668 : const unsigned long *ul1 = (const unsigned long *)a1;
669 : const unsigned long *ul2 = (const unsigned long *)a2;
670 :
671 : return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
672 : #else
673 : return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
674 : (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
675 : (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
676 : (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
677 : #endif
678 : }
679 :
680 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
681 : static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
682 : const __be64 *a2,
683 : unsigned int len)
684 : {
685 : if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
686 : return false;
687 : return true;
688 : }
689 :
690 : static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
691 : const struct in6_addr *addr2,
692 : unsigned int prefixlen)
693 : {
694 : const __be64 *a1 = (const __be64 *)addr1;
695 : const __be64 *a2 = (const __be64 *)addr2;
696 :
697 : if (prefixlen >= 64) {
698 : if (a1[0] ^ a2[0])
699 : return false;
700 : return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
701 : }
702 : return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
703 : }
704 : #else
705 : static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
706 : const struct in6_addr *addr2,
707 : unsigned int prefixlen)
708 : {
709 : const __be32 *a1 = addr1->s6_addr32;
710 : const __be32 *a2 = addr2->s6_addr32;
711 : unsigned int pdw, pbi;
712 :
713 : /* check complete u32 in prefix */
714 : pdw = prefixlen >> 5;
715 : if (pdw && memcmp(a1, a2, pdw << 2))
716 : return false;
717 :
718 : /* check incomplete u32 in prefix */
719 : pbi = prefixlen & 0x1f;
720 : if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
721 : return false;
722 :
723 : return true;
724 : }
725 : #endif
726 :
727 : static inline bool ipv6_addr_any(const struct in6_addr *a)
728 : {
729 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
730 : const unsigned long *ul = (const unsigned long *)a;
731 :
732 : return (ul[0] | ul[1]) == 0UL;
733 : #else
734 : return (a->s6_addr32[0] | a->s6_addr32[1] |
735 : a->s6_addr32[2] | a->s6_addr32[3]) == 0;
736 : #endif
737 : }
738 :
739 : static inline u32 ipv6_addr_hash(const struct in6_addr *a)
740 : {
741 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
742 : const unsigned long *ul = (const unsigned long *)a;
743 : unsigned long x = ul[0] ^ ul[1];
744 :
745 : return (u32)(x ^ (x >> 32));
746 : #else
747 : return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
748 : a->s6_addr32[2] ^ a->s6_addr32[3]);
749 : #endif
750 : }
751 :
752 : /* more secured version of ipv6_addr_hash() */
753 : static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
754 : {
755 : u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
756 :
757 : return jhash_3words(v,
758 : (__force u32)a->s6_addr32[2],
759 : (__force u32)a->s6_addr32[3],
760 : initval);
761 : }
762 :
763 : static inline bool ipv6_addr_loopback(const struct in6_addr *a)
764 : {
765 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
766 : const __be64 *be = (const __be64 *)a;
767 :
768 : return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
769 : #else
770 : return (a->s6_addr32[0] | a->s6_addr32[1] |
771 : a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
772 : #endif
773 : }
774 :
775 : /*
776 : * Note that we must __force cast these to unsigned long to make sparse happy,
777 : * since all of the endian-annotated types are fixed size regardless of arch.
778 : */
779 : static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
780 : {
781 : return (
782 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
783 : *(unsigned long *)a |
784 : #else
785 0 : (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
786 : #endif
787 0 : (__force unsigned long)(a->s6_addr32[2] ^
788 0 : cpu_to_be32(0x0000ffff))) == 0UL;
789 : }
790 :
791 : static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a)
792 : {
793 : return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]);
794 : }
795 :
796 : static inline u32 ipv6_portaddr_hash(const struct net *net,
797 : const struct in6_addr *addr6,
798 : unsigned int port)
799 : {
800 : unsigned int hash, mix = net_hash_mix(net);
801 :
802 : if (ipv6_addr_any(addr6))
803 : hash = jhash_1word(0, mix);
804 : else if (ipv6_addr_v4mapped(addr6))
805 : hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
806 : else
807 : hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
808 :
809 : return hash ^ port;
810 : }
811 :
812 : /*
813 : * Check for a RFC 4843 ORCHID address
814 : * (Overlay Routable Cryptographic Hash Identifiers)
815 : */
816 : static inline bool ipv6_addr_orchid(const struct in6_addr *a)
817 : {
818 : return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
819 : }
820 :
821 : static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
822 : {
823 : return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
824 : }
825 :
826 : static inline void ipv6_addr_set_v4mapped(const __be32 addr,
827 : struct in6_addr *v4mapped)
828 : {
829 : ipv6_addr_set(v4mapped,
830 : 0, 0,
831 : htonl(0x0000FFFF),
832 : addr);
833 : }
834 :
835 : /*
836 : * find the first different bit between two addresses
837 : * length of address must be a multiple of 32bits
838 : */
839 : static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
840 : {
841 : const __be32 *a1 = token1, *a2 = token2;
842 : int i;
843 :
844 : addrlen >>= 2;
845 :
846 : for (i = 0; i < addrlen; i++) {
847 : __be32 xb = a1[i] ^ a2[i];
848 : if (xb)
849 : return i * 32 + 31 - __fls(ntohl(xb));
850 : }
851 :
852 : /*
853 : * we should *never* get to this point since that
854 : * would mean the addrs are equal
855 : *
856 : * However, we do get to it 8) And exacly, when
857 : * addresses are equal 8)
858 : *
859 : * ip route add 1111::/128 via ...
860 : * ip route add 1111::/64 via ...
861 : * and we are here.
862 : *
863 : * Ideally, this function should stop comparison
864 : * at prefix length. It does not, but it is still OK,
865 : * if returned value is greater than prefix length.
866 : * --ANK (980803)
867 : */
868 : return addrlen << 5;
869 : }
870 :
871 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
872 : static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
873 : {
874 : const __be64 *a1 = token1, *a2 = token2;
875 : int i;
876 :
877 : addrlen >>= 3;
878 :
879 : for (i = 0; i < addrlen; i++) {
880 : __be64 xb = a1[i] ^ a2[i];
881 : if (xb)
882 : return i * 64 + 63 - __fls(be64_to_cpu(xb));
883 : }
884 :
885 : return addrlen << 6;
886 : }
887 : #endif
888 :
889 : static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
890 : {
891 : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
892 : if (__builtin_constant_p(addrlen) && !(addrlen & 7))
893 : return __ipv6_addr_diff64(token1, token2, addrlen);
894 : #endif
895 : return __ipv6_addr_diff32(token1, token2, addrlen);
896 : }
897 :
898 : static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
899 : {
900 : return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
901 : }
902 :
903 : __be32 ipv6_select_ident(struct net *net,
904 : const struct in6_addr *daddr,
905 : const struct in6_addr *saddr);
906 : __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
907 :
908 : int ip6_dst_hoplimit(struct dst_entry *dst);
909 :
910 : static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
911 : struct dst_entry *dst)
912 : {
913 : int hlimit;
914 :
915 : if (ipv6_addr_is_multicast(&fl6->daddr))
916 : hlimit = np->mcast_hops;
917 : else
918 : hlimit = np->hop_limit;
919 : if (hlimit < 0)
920 : hlimit = ip6_dst_hoplimit(dst);
921 : return hlimit;
922 : }
923 :
924 : /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
925 : * Equivalent to : flow->v6addrs.src = iph->saddr;
926 : * flow->v6addrs.dst = iph->daddr;
927 : */
928 : static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
929 : const struct ipv6hdr *iph)
930 : {
931 : BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
932 : offsetof(typeof(flow->addrs), v6addrs.src) +
933 : sizeof(flow->addrs.v6addrs.src));
934 : memcpy(&flow->addrs.v6addrs, &iph->addrs, sizeof(flow->addrs.v6addrs));
935 : flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
936 : }
937 :
938 : #if IS_ENABLED(CONFIG_IPV6)
939 :
940 : static inline bool ipv6_can_nonlocal_bind(struct net *net,
941 : struct inet_sock *inet)
942 : {
943 : return net->ipv6.sysctl.ip_nonlocal_bind ||
944 : inet->freebind || inet->transparent;
945 : }
946 :
947 : /* Sysctl settings for net ipv6.auto_flowlabels */
948 : #define IP6_AUTO_FLOW_LABEL_OFF 0
949 : #define IP6_AUTO_FLOW_LABEL_OPTOUT 1
950 : #define IP6_AUTO_FLOW_LABEL_OPTIN 2
951 : #define IP6_AUTO_FLOW_LABEL_FORCED 3
952 :
953 : #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
954 :
955 : #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
956 :
957 : static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
958 : __be32 flowlabel, bool autolabel,
959 : struct flowi6 *fl6)
960 : {
961 : u32 hash;
962 :
963 : /* @flowlabel may include more than a flow label, eg, the traffic class.
964 : * Here we want only the flow label value.
965 : */
966 : flowlabel &= IPV6_FLOWLABEL_MASK;
967 :
968 : if (flowlabel ||
969 : net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
970 : (!autolabel &&
971 : net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
972 : return flowlabel;
973 :
974 : hash = skb_get_hash_flowi6(skb, fl6);
975 :
976 : /* Since this is being sent on the wire obfuscate hash a bit
977 : * to minimize possbility that any useful information to an
978 : * attacker is leaked. Only lower 20 bits are relevant.
979 : */
980 : hash = rol32(hash, 16);
981 :
982 : flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
983 :
984 : if (net->ipv6.sysctl.flowlabel_state_ranges)
985 : flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
986 :
987 : return flowlabel;
988 : }
989 :
990 : static inline int ip6_default_np_autolabel(struct net *net)
991 : {
992 : switch (net->ipv6.sysctl.auto_flowlabels) {
993 : case IP6_AUTO_FLOW_LABEL_OFF:
994 : case IP6_AUTO_FLOW_LABEL_OPTIN:
995 : default:
996 : return 0;
997 : case IP6_AUTO_FLOW_LABEL_OPTOUT:
998 : case IP6_AUTO_FLOW_LABEL_FORCED:
999 : return 1;
1000 : }
1001 : }
1002 : #else
1003 : static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
1004 : __be32 flowlabel, bool autolabel,
1005 : struct flowi6 *fl6)
1006 : {
1007 : return flowlabel;
1008 : }
1009 : static inline int ip6_default_np_autolabel(struct net *net)
1010 : {
1011 : return 0;
1012 : }
1013 : #endif
1014 :
1015 : #if IS_ENABLED(CONFIG_IPV6)
1016 : static inline int ip6_multipath_hash_policy(const struct net *net)
1017 : {
1018 : return net->ipv6.sysctl.multipath_hash_policy;
1019 : }
1020 : static inline u32 ip6_multipath_hash_fields(const struct net *net)
1021 : {
1022 : return net->ipv6.sysctl.multipath_hash_fields;
1023 : }
1024 : #else
1025 : static inline int ip6_multipath_hash_policy(const struct net *net)
1026 : {
1027 : return 0;
1028 : }
1029 : static inline u32 ip6_multipath_hash_fields(const struct net *net)
1030 : {
1031 : return 0;
1032 : }
1033 : #endif
1034 :
1035 : /*
1036 : * Header manipulation
1037 : */
1038 : static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
1039 : __be32 flowlabel)
1040 : {
1041 : *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
1042 : }
1043 :
1044 : static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
1045 : {
1046 : return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
1047 : }
1048 :
1049 : static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
1050 : {
1051 : return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
1052 : }
1053 :
1054 : static inline u8 ip6_tclass(__be32 flowinfo)
1055 : {
1056 : return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
1057 : }
1058 :
1059 : static inline dscp_t ip6_dscp(__be32 flowinfo)
1060 : {
1061 : return inet_dsfield_to_dscp(ip6_tclass(flowinfo));
1062 : }
1063 :
1064 : static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
1065 : {
1066 : return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
1067 : }
1068 :
1069 : static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6)
1070 : {
1071 : return fl6->flowlabel & IPV6_FLOWLABEL_MASK;
1072 : }
1073 :
1074 : /*
1075 : * Prototypes exported by ipv6
1076 : */
1077 :
1078 : /*
1079 : * rcv function (called from netdevice level)
1080 : */
1081 :
1082 : int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
1083 : struct packet_type *pt, struct net_device *orig_dev);
1084 : void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
1085 : struct net_device *orig_dev);
1086 :
1087 : int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
1088 :
1089 : /*
1090 : * upper-layer output functions
1091 : */
1092 : int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
1093 : __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority);
1094 :
1095 : int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
1096 :
1097 : int ip6_append_data(struct sock *sk,
1098 : int getfrag(void *from, char *to, int offset, int len,
1099 : int odd, struct sk_buff *skb),
1100 : void *from, size_t length, int transhdrlen,
1101 : struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
1102 : struct rt6_info *rt, unsigned int flags);
1103 :
1104 : int ip6_push_pending_frames(struct sock *sk);
1105 :
1106 : void ip6_flush_pending_frames(struct sock *sk);
1107 :
1108 : int ip6_send_skb(struct sk_buff *skb);
1109 :
1110 : struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
1111 : struct inet_cork_full *cork,
1112 : struct inet6_cork *v6_cork);
1113 : struct sk_buff *ip6_make_skb(struct sock *sk,
1114 : int getfrag(void *from, char *to, int offset,
1115 : int len, int odd, struct sk_buff *skb),
1116 : void *from, size_t length, int transhdrlen,
1117 : struct ipcm6_cookie *ipc6,
1118 : struct rt6_info *rt, unsigned int flags,
1119 : struct inet_cork_full *cork);
1120 :
1121 : static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
1122 : {
1123 : return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
1124 : &inet6_sk(sk)->cork);
1125 : }
1126 :
1127 : int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
1128 : struct flowi6 *fl6);
1129 : struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6,
1130 : const struct in6_addr *final_dst);
1131 : struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
1132 : const struct in6_addr *final_dst,
1133 : bool connected);
1134 : struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb,
1135 : struct net_device *dev,
1136 : struct net *net, struct socket *sock,
1137 : struct in6_addr *saddr,
1138 : const struct ip_tunnel_info *info,
1139 : u8 protocol, bool use_cache);
1140 : struct dst_entry *ip6_blackhole_route(struct net *net,
1141 : struct dst_entry *orig_dst);
1142 :
1143 : /*
1144 : * skb processing functions
1145 : */
1146 :
1147 : int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1148 : int ip6_forward(struct sk_buff *skb);
1149 : int ip6_input(struct sk_buff *skb);
1150 : int ip6_mc_input(struct sk_buff *skb);
1151 : void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
1152 : bool have_final);
1153 :
1154 : int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1155 : int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1156 :
1157 : /*
1158 : * Extension header (options) processing
1159 : */
1160 :
1161 : void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1162 : u8 *proto, struct in6_addr **daddr_p,
1163 : struct in6_addr *saddr);
1164 : void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1165 : u8 *proto);
1166 :
1167 : int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
1168 : __be16 *frag_offp);
1169 :
1170 : bool ipv6_ext_hdr(u8 nexthdr);
1171 :
1172 : enum {
1173 : IP6_FH_F_FRAG = (1 << 0),
1174 : IP6_FH_F_AUTH = (1 << 1),
1175 : IP6_FH_F_SKIP_RH = (1 << 2),
1176 : };
1177 :
1178 : /* find specified header and get offset to it */
1179 : int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
1180 : unsigned short *fragoff, int *fragflg);
1181 :
1182 : int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
1183 :
1184 : struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
1185 : const struct ipv6_txoptions *opt,
1186 : struct in6_addr *orig);
1187 :
1188 : /*
1189 : * socket options (ipv6_sockglue.c)
1190 : */
1191 : DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount);
1192 :
1193 : int do_ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1194 : unsigned int optlen);
1195 : int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1196 : unsigned int optlen);
1197 : int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1198 : sockptr_t optval, sockptr_t optlen);
1199 : int ipv6_getsockopt(struct sock *sk, int level, int optname,
1200 : char __user *optval, int __user *optlen);
1201 :
1202 : int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
1203 : int addr_len);
1204 : int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
1205 : int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
1206 : int addr_len);
1207 : int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
1208 : void ip6_datagram_release_cb(struct sock *sk);
1209 :
1210 : int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
1211 : int *addr_len);
1212 : int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
1213 : int *addr_len);
1214 : void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1215 : u32 info, u8 *payload);
1216 : void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
1217 : void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
1218 :
1219 : void inet6_cleanup_sock(struct sock *sk);
1220 : void inet6_sock_destruct(struct sock *sk);
1221 : int inet6_release(struct socket *sock);
1222 : int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
1223 : int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
1224 : int peer);
1225 : int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1226 : int inet6_compat_ioctl(struct socket *sock, unsigned int cmd,
1227 : unsigned long arg);
1228 :
1229 : int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1230 : struct sock *sk);
1231 : int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size);
1232 : int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1233 : int flags);
1234 :
1235 : /*
1236 : * reassembly.c
1237 : */
1238 : extern const struct proto_ops inet6_stream_ops;
1239 : extern const struct proto_ops inet6_dgram_ops;
1240 : extern const struct proto_ops inet6_sockraw_ops;
1241 :
1242 : struct group_source_req;
1243 : struct group_filter;
1244 :
1245 : int ip6_mc_source(int add, int omode, struct sock *sk,
1246 : struct group_source_req *pgsr);
1247 : int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
1248 : struct sockaddr_storage *list);
1249 : int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1250 : sockptr_t optval, size_t ss_offset);
1251 :
1252 : #ifdef CONFIG_PROC_FS
1253 : int ac6_proc_init(struct net *net);
1254 : void ac6_proc_exit(struct net *net);
1255 : int raw6_proc_init(void);
1256 : void raw6_proc_exit(void);
1257 : int tcp6_proc_init(struct net *net);
1258 : void tcp6_proc_exit(struct net *net);
1259 : int udp6_proc_init(struct net *net);
1260 : void udp6_proc_exit(struct net *net);
1261 : int udplite6_proc_init(void);
1262 : void udplite6_proc_exit(void);
1263 : int ipv6_misc_proc_init(void);
1264 : void ipv6_misc_proc_exit(void);
1265 : int snmp6_register_dev(struct inet6_dev *idev);
1266 : int snmp6_unregister_dev(struct inet6_dev *idev);
1267 :
1268 : #else
1269 : static inline int ac6_proc_init(struct net *net) { return 0; }
1270 : static inline void ac6_proc_exit(struct net *net) { }
1271 : static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1272 : static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1273 : #endif
1274 :
1275 : #ifdef CONFIG_SYSCTL
1276 : struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1277 : struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1278 : int ipv6_sysctl_register(void);
1279 : void ipv6_sysctl_unregister(void);
1280 : #endif
1281 :
1282 : int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1283 : const struct in6_addr *addr);
1284 : int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
1285 : const struct in6_addr *addr, unsigned int mode);
1286 : int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1287 : const struct in6_addr *addr);
1288 :
1289 : static inline int ip6_sock_set_v6only(struct sock *sk)
1290 : {
1291 : if (inet_sk(sk)->inet_num)
1292 : return -EINVAL;
1293 : lock_sock(sk);
1294 : sk->sk_ipv6only = true;
1295 : release_sock(sk);
1296 : return 0;
1297 : }
1298 :
1299 : static inline void ip6_sock_set_recverr(struct sock *sk)
1300 : {
1301 : lock_sock(sk);
1302 : inet6_sk(sk)->recverr = true;
1303 : release_sock(sk);
1304 : }
1305 :
1306 : static inline int __ip6_sock_set_addr_preferences(struct sock *sk, int val)
1307 : {
1308 : unsigned int pref = 0;
1309 : unsigned int prefmask = ~0;
1310 :
1311 : /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
1312 : switch (val & (IPV6_PREFER_SRC_PUBLIC |
1313 : IPV6_PREFER_SRC_TMP |
1314 : IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
1315 : case IPV6_PREFER_SRC_PUBLIC:
1316 : pref |= IPV6_PREFER_SRC_PUBLIC;
1317 : prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1318 : IPV6_PREFER_SRC_TMP);
1319 : break;
1320 : case IPV6_PREFER_SRC_TMP:
1321 : pref |= IPV6_PREFER_SRC_TMP;
1322 : prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1323 : IPV6_PREFER_SRC_TMP);
1324 : break;
1325 : case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
1326 : prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1327 : IPV6_PREFER_SRC_TMP);
1328 : break;
1329 : case 0:
1330 : break;
1331 : default:
1332 : return -EINVAL;
1333 : }
1334 :
1335 : /* check HOME/COA conflicts */
1336 : switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) {
1337 : case IPV6_PREFER_SRC_HOME:
1338 : prefmask &= ~IPV6_PREFER_SRC_COA;
1339 : break;
1340 : case IPV6_PREFER_SRC_COA:
1341 : pref |= IPV6_PREFER_SRC_COA;
1342 : break;
1343 : case 0:
1344 : break;
1345 : default:
1346 : return -EINVAL;
1347 : }
1348 :
1349 : /* check CGA/NONCGA conflicts */
1350 : switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
1351 : case IPV6_PREFER_SRC_CGA:
1352 : case IPV6_PREFER_SRC_NONCGA:
1353 : case 0:
1354 : break;
1355 : default:
1356 : return -EINVAL;
1357 : }
1358 :
1359 : inet6_sk(sk)->srcprefs = (inet6_sk(sk)->srcprefs & prefmask) | pref;
1360 : return 0;
1361 : }
1362 :
1363 : static inline int ip6_sock_set_addr_preferences(struct sock *sk, bool val)
1364 : {
1365 : int ret;
1366 :
1367 : lock_sock(sk);
1368 : ret = __ip6_sock_set_addr_preferences(sk, val);
1369 : release_sock(sk);
1370 : return ret;
1371 : }
1372 :
1373 : static inline void ip6_sock_set_recvpktinfo(struct sock *sk)
1374 : {
1375 : lock_sock(sk);
1376 : inet6_sk(sk)->rxopt.bits.rxinfo = true;
1377 : release_sock(sk);
1378 : }
1379 :
1380 : #endif /* _NET_IPV6_H */
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