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x86: apic copy calibrate_APIC_clock to each other in apic_32/64.c
[deliverable/linux.git] / include / net / xfrm.h
1 #ifndef _NET_XFRM_H
2 #define _NET_XFRM_H
3
4 #include <linux/compiler.h>
5 #include <linux/xfrm.h>
6 #include <linux/spinlock.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9 #include <linux/socket.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/ipsec.h>
12 #include <linux/in6.h>
13 #include <linux/mutex.h>
14 #include <linux/audit.h>
15
16 #include <net/sock.h>
17 #include <net/dst.h>
18 #include <net/ip.h>
19 #include <net/route.h>
20 #include <net/ipv6.h>
21 #include <net/ip6_fib.h>
22 #ifdef CONFIG_XFRM_STATISTICS
23 #include <net/snmp.h>
24 #endif
25
26 #define XFRM_PROTO_ESP 50
27 #define XFRM_PROTO_AH 51
28 #define XFRM_PROTO_COMP 108
29 #define XFRM_PROTO_IPIP 4
30 #define XFRM_PROTO_IPV6 41
31 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
32 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
33
34 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
35 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
36 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
37 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
38 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
39
40 #ifdef CONFIG_XFRM_STATISTICS
41 DECLARE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics);
42 #define XFRM_INC_STATS(field) SNMP_INC_STATS(xfrm_statistics, field)
43 #define XFRM_INC_STATS_BH(field) SNMP_INC_STATS_BH(xfrm_statistics, field)
44 #define XFRM_INC_STATS_USER(field) SNMP_INC_STATS_USER(xfrm_statistics, field)
45 #else
46 #define XFRM_INC_STATS(field)
47 #define XFRM_INC_STATS_BH(field)
48 #define XFRM_INC_STATS_USER(field)
49 #endif
50
51 extern struct sock *xfrm_nl;
52 extern u32 sysctl_xfrm_aevent_etime;
53 extern u32 sysctl_xfrm_aevent_rseqth;
54 extern int sysctl_xfrm_larval_drop;
55 extern u32 sysctl_xfrm_acq_expires;
56
57 extern struct mutex xfrm_cfg_mutex;
58
59 /* Organization of SPD aka "XFRM rules"
60 ------------------------------------
61
62 Basic objects:
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
67
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72
73 Lookup is plain linear search until the first match with selector.
74
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
81
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
85 |---. child .-> NULL
86
87 Bundles are cached at xrfm_policy struct (field ->bundles).
88
89
90 Resolution of xrfm_tmpl
91 -----------------------
92 Template contains:
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
103 flow id?
104
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
108
109 PROBLEMS:
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
118 */
119
120 struct xfrm_state_walk {
121 struct list_head all;
122 u8 state;
123 union {
124 u8 dying;
125 u8 proto;
126 };
127 u32 seq;
128 };
129
130 /* Full description of state of transformer. */
131 struct xfrm_state
132 {
133 union {
134 struct hlist_node gclist;
135 struct hlist_node bydst;
136 };
137 struct hlist_node bysrc;
138 struct hlist_node byspi;
139
140 atomic_t refcnt;
141 spinlock_t lock;
142
143 struct xfrm_id id;
144 struct xfrm_selector sel;
145
146 u32 genid;
147
148 /* Key manager bits */
149 struct xfrm_state_walk km;
150
151 /* Parameters of this state. */
152 struct {
153 u32 reqid;
154 u8 mode;
155 u8 replay_window;
156 u8 aalgo, ealgo, calgo;
157 u8 flags;
158 u16 family;
159 xfrm_address_t saddr;
160 int header_len;
161 int trailer_len;
162 } props;
163
164 struct xfrm_lifetime_cfg lft;
165
166 /* Data for transformer */
167 struct xfrm_algo *aalg;
168 struct xfrm_algo *ealg;
169 struct xfrm_algo *calg;
170 struct xfrm_algo_aead *aead;
171
172 /* Data for encapsulator */
173 struct xfrm_encap_tmpl *encap;
174
175 /* Data for care-of address */
176 xfrm_address_t *coaddr;
177
178 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
179 struct xfrm_state *tunnel;
180
181 /* If a tunnel, number of users + 1 */
182 atomic_t tunnel_users;
183
184 /* State for replay detection */
185 struct xfrm_replay_state replay;
186
187 /* Replay detection state at the time we sent the last notification */
188 struct xfrm_replay_state preplay;
189
190 /* internal flag that only holds state for delayed aevent at the
191 * moment
192 */
193 u32 xflags;
194
195 /* Replay detection notification settings */
196 u32 replay_maxage;
197 u32 replay_maxdiff;
198
199 /* Replay detection notification timer */
200 struct timer_list rtimer;
201
202 /* Statistics */
203 struct xfrm_stats stats;
204
205 struct xfrm_lifetime_cur curlft;
206 struct timer_list timer;
207
208 /* Last used time */
209 unsigned long lastused;
210
211 /* Reference to data common to all the instances of this
212 * transformer. */
213 const struct xfrm_type *type;
214 struct xfrm_mode *inner_mode;
215 struct xfrm_mode *inner_mode_iaf;
216 struct xfrm_mode *outer_mode;
217
218 /* Security context */
219 struct xfrm_sec_ctx *security;
220
221 /* Private data of this transformer, format is opaque,
222 * interpreted by xfrm_type methods. */
223 void *data;
224 };
225
226 /* xflags - make enum if more show up */
227 #define XFRM_TIME_DEFER 1
228
229 enum {
230 XFRM_STATE_VOID,
231 XFRM_STATE_ACQ,
232 XFRM_STATE_VALID,
233 XFRM_STATE_ERROR,
234 XFRM_STATE_EXPIRED,
235 XFRM_STATE_DEAD
236 };
237
238 /* callback structure passed from either netlink or pfkey */
239 struct km_event
240 {
241 union {
242 u32 hard;
243 u32 proto;
244 u32 byid;
245 u32 aevent;
246 u32 type;
247 } data;
248
249 u32 seq;
250 u32 pid;
251 u32 event;
252 };
253
254 struct net_device;
255 struct xfrm_type;
256 struct xfrm_dst;
257 struct xfrm_policy_afinfo {
258 unsigned short family;
259 struct dst_ops *dst_ops;
260 void (*garbage_collect)(void);
261 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
262 xfrm_address_t *daddr);
263 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
264 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
265 void (*decode_session)(struct sk_buff *skb,
266 struct flowi *fl,
267 int reverse);
268 int (*get_tos)(struct flowi *fl);
269 int (*init_path)(struct xfrm_dst *path,
270 struct dst_entry *dst,
271 int nfheader_len);
272 int (*fill_dst)(struct xfrm_dst *xdst,
273 struct net_device *dev);
274 };
275
276 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
277 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
278 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
279 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
280
281 struct xfrm_tmpl;
282 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
283 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
284 extern int __xfrm_state_delete(struct xfrm_state *x);
285
286 struct xfrm_state_afinfo {
287 unsigned int family;
288 unsigned int proto;
289 __be16 eth_proto;
290 struct module *owner;
291 const struct xfrm_type *type_map[IPPROTO_MAX];
292 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
293 int (*init_flags)(struct xfrm_state *x);
294 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
295 struct xfrm_tmpl *tmpl,
296 xfrm_address_t *daddr, xfrm_address_t *saddr);
297 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
298 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
299 int (*output)(struct sk_buff *skb);
300 int (*extract_input)(struct xfrm_state *x,
301 struct sk_buff *skb);
302 int (*extract_output)(struct xfrm_state *x,
303 struct sk_buff *skb);
304 int (*transport_finish)(struct sk_buff *skb,
305 int async);
306 };
307
308 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
309 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
310
311 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
312
313 struct xfrm_type
314 {
315 char *description;
316 struct module *owner;
317 __u8 proto;
318 __u8 flags;
319 #define XFRM_TYPE_NON_FRAGMENT 1
320 #define XFRM_TYPE_REPLAY_PROT 2
321 #define XFRM_TYPE_LOCAL_COADDR 4
322 #define XFRM_TYPE_REMOTE_COADDR 8
323
324 int (*init_state)(struct xfrm_state *x);
325 void (*destructor)(struct xfrm_state *);
326 int (*input)(struct xfrm_state *, struct sk_buff *skb);
327 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
328 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
329 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
330 /* Estimate maximal size of result of transformation of a dgram */
331 u32 (*get_mtu)(struct xfrm_state *, int size);
332 };
333
334 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
335 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
336
337 struct xfrm_mode {
338 /*
339 * Remove encapsulation header.
340 *
341 * The IP header will be moved over the top of the encapsulation
342 * header.
343 *
344 * On entry, the transport header shall point to where the IP header
345 * should be and the network header shall be set to where the IP
346 * header currently is. skb->data shall point to the start of the
347 * payload.
348 */
349 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
350
351 /*
352 * This is the actual input entry point.
353 *
354 * For transport mode and equivalent this would be identical to
355 * input2 (which does not need to be set). While tunnel mode
356 * and equivalent would set this to the tunnel encapsulation function
357 * xfrm4_prepare_input that would in turn call input2.
358 */
359 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
360
361 /*
362 * Add encapsulation header.
363 *
364 * On exit, the transport header will be set to the start of the
365 * encapsulation header to be filled in by x->type->output and
366 * the mac header will be set to the nextheader (protocol for
367 * IPv4) field of the extension header directly preceding the
368 * encapsulation header, or in its absence, that of the top IP
369 * header. The value of the network header will always point
370 * to the top IP header while skb->data will point to the payload.
371 */
372 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
373
374 /*
375 * This is the actual output entry point.
376 *
377 * For transport mode and equivalent this would be identical to
378 * output2 (which does not need to be set). While tunnel mode
379 * and equivalent would set this to a tunnel encapsulation function
380 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
381 * call output2.
382 */
383 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
384
385 struct xfrm_state_afinfo *afinfo;
386 struct module *owner;
387 unsigned int encap;
388 int flags;
389 };
390
391 /* Flags for xfrm_mode. */
392 enum {
393 XFRM_MODE_FLAG_TUNNEL = 1,
394 };
395
396 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
397 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
398
399 static inline int xfrm_af2proto(unsigned int family)
400 {
401 switch(family) {
402 case AF_INET:
403 return IPPROTO_IPIP;
404 case AF_INET6:
405 return IPPROTO_IPV6;
406 default:
407 return 0;
408 }
409 }
410
411 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
412 {
413 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
414 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
415 return x->inner_mode;
416 else
417 return x->inner_mode_iaf;
418 }
419
420 struct xfrm_tmpl
421 {
422 /* id in template is interpreted as:
423 * daddr - destination of tunnel, may be zero for transport mode.
424 * spi - zero to acquire spi. Not zero if spi is static, then
425 * daddr must be fixed too.
426 * proto - AH/ESP/IPCOMP
427 */
428 struct xfrm_id id;
429
430 /* Source address of tunnel. Ignored, if it is not a tunnel. */
431 xfrm_address_t saddr;
432
433 unsigned short encap_family;
434
435 __u32 reqid;
436
437 /* Mode: transport, tunnel etc. */
438 __u8 mode;
439
440 /* Sharing mode: unique, this session only, this user only etc. */
441 __u8 share;
442
443 /* May skip this transfomration if no SA is found */
444 __u8 optional;
445
446 /* Skip aalgos/ealgos/calgos checks. */
447 __u8 allalgs;
448
449 /* Bit mask of algos allowed for acquisition */
450 __u32 aalgos;
451 __u32 ealgos;
452 __u32 calgos;
453 };
454
455 #define XFRM_MAX_DEPTH 6
456
457 struct xfrm_policy_walk_entry {
458 struct list_head all;
459 u8 dead;
460 };
461
462 struct xfrm_policy_walk {
463 struct xfrm_policy_walk_entry walk;
464 u8 type;
465 u32 seq;
466 };
467
468 struct xfrm_policy
469 {
470 struct xfrm_policy *next;
471 struct hlist_node bydst;
472 struct hlist_node byidx;
473
474 /* This lock only affects elements except for entry. */
475 rwlock_t lock;
476 atomic_t refcnt;
477 struct timer_list timer;
478
479 u32 priority;
480 u32 index;
481 struct xfrm_selector selector;
482 struct xfrm_lifetime_cfg lft;
483 struct xfrm_lifetime_cur curlft;
484 struct dst_entry *bundles;
485 struct xfrm_policy_walk_entry walk;
486 u8 type;
487 u8 action;
488 u8 flags;
489 u8 xfrm_nr;
490 u16 family;
491 struct xfrm_sec_ctx *security;
492 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
493 };
494
495 struct xfrm_kmaddress {
496 xfrm_address_t local;
497 xfrm_address_t remote;
498 u32 reserved;
499 u16 family;
500 };
501
502 struct xfrm_migrate {
503 xfrm_address_t old_daddr;
504 xfrm_address_t old_saddr;
505 xfrm_address_t new_daddr;
506 xfrm_address_t new_saddr;
507 u8 proto;
508 u8 mode;
509 u16 reserved;
510 u32 reqid;
511 u16 old_family;
512 u16 new_family;
513 };
514
515 #define XFRM_KM_TIMEOUT 30
516 /* which seqno */
517 #define XFRM_REPLAY_SEQ 1
518 #define XFRM_REPLAY_OSEQ 2
519 #define XFRM_REPLAY_SEQ_MASK 3
520 /* what happened */
521 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
522 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
523
524 /* default aevent timeout in units of 100ms */
525 #define XFRM_AE_ETIME 10
526 /* Async Event timer multiplier */
527 #define XFRM_AE_ETH_M 10
528 /* default seq threshold size */
529 #define XFRM_AE_SEQT_SIZE 2
530
531 struct xfrm_mgr
532 {
533 struct list_head list;
534 char *id;
535 int (*notify)(struct xfrm_state *x, struct km_event *c);
536 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
537 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
538 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
539 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
540 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
541 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
542 };
543
544 extern int xfrm_register_km(struct xfrm_mgr *km);
545 extern int xfrm_unregister_km(struct xfrm_mgr *km);
546
547 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
548
549 /*
550 * This structure is used for the duration where packets are being
551 * transformed by IPsec. As soon as the packet leaves IPsec the
552 * area beyond the generic IP part may be overwritten.
553 */
554 struct xfrm_skb_cb {
555 union {
556 struct inet_skb_parm h4;
557 struct inet6_skb_parm h6;
558 } header;
559
560 /* Sequence number for replay protection. */
561 union {
562 u64 output;
563 __be32 input;
564 } seq;
565 };
566
567 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
568
569 /*
570 * This structure is used by the afinfo prepare_input/prepare_output functions
571 * to transmit header information to the mode input/output functions.
572 */
573 struct xfrm_mode_skb_cb {
574 union {
575 struct inet_skb_parm h4;
576 struct inet6_skb_parm h6;
577 } header;
578
579 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
580 __be16 id;
581 __be16 frag_off;
582
583 /* IP header length (excluding options or extension headers). */
584 u8 ihl;
585
586 /* TOS for IPv4, class for IPv6. */
587 u8 tos;
588
589 /* TTL for IPv4, hop limitfor IPv6. */
590 u8 ttl;
591
592 /* Protocol for IPv4, NH for IPv6. */
593 u8 protocol;
594
595 /* Option length for IPv4, zero for IPv6. */
596 u8 optlen;
597
598 /* Used by IPv6 only, zero for IPv4. */
599 u8 flow_lbl[3];
600 };
601
602 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
603
604 /*
605 * This structure is used by the input processing to locate the SPI and
606 * related information.
607 */
608 struct xfrm_spi_skb_cb {
609 union {
610 struct inet_skb_parm h4;
611 struct inet6_skb_parm h6;
612 } header;
613
614 unsigned int daddroff;
615 unsigned int family;
616 };
617
618 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
619
620 /* Audit Information */
621 struct xfrm_audit
622 {
623 u32 secid;
624 uid_t loginuid;
625 u32 sessionid;
626 };
627
628 #ifdef CONFIG_AUDITSYSCALL
629 static inline struct audit_buffer *xfrm_audit_start(const char *op)
630 {
631 struct audit_buffer *audit_buf = NULL;
632
633 if (audit_enabled == 0)
634 return NULL;
635 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
636 AUDIT_MAC_IPSEC_EVENT);
637 if (audit_buf == NULL)
638 return NULL;
639 audit_log_format(audit_buf, "op=%s", op);
640 return audit_buf;
641 }
642
643 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
644 struct audit_buffer *audit_buf)
645 {
646 char *secctx;
647 u32 secctx_len;
648
649 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
650 if (secid != 0 &&
651 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
652 audit_log_format(audit_buf, " subj=%s", secctx);
653 security_release_secctx(secctx, secctx_len);
654 } else
655 audit_log_task_context(audit_buf);
656 }
657
658 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
659 u32 auid, u32 ses, u32 secid);
660 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
661 u32 auid, u32 ses, u32 secid);
662 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
663 u32 auid, u32 ses, u32 secid);
664 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
665 u32 auid, u32 ses, u32 secid);
666 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
667 struct sk_buff *skb);
668 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
669 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
670 __be32 net_spi, __be32 net_seq);
671 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
672 struct sk_buff *skb, u8 proto);
673 #else
674
675 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
676 u32 auid, u32 ses, u32 secid)
677 {
678 }
679
680 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
681 u32 auid, u32 ses, u32 secid)
682 {
683 }
684
685 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
686 u32 auid, u32 ses, u32 secid)
687 {
688 }
689
690 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
691 u32 auid, u32 ses, u32 secid)
692 {
693 }
694
695 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
696 struct sk_buff *skb)
697 {
698 }
699
700 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
701 u16 family)
702 {
703 }
704
705 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
706 __be32 net_spi, __be32 net_seq)
707 {
708 }
709
710 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
711 struct sk_buff *skb, u8 proto)
712 {
713 }
714 #endif /* CONFIG_AUDITSYSCALL */
715
716 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
717 {
718 if (likely(policy != NULL))
719 atomic_inc(&policy->refcnt);
720 }
721
722 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
723
724 static inline void xfrm_pol_put(struct xfrm_policy *policy)
725 {
726 if (atomic_dec_and_test(&policy->refcnt))
727 xfrm_policy_destroy(policy);
728 }
729
730 #ifdef CONFIG_XFRM_SUB_POLICY
731 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
732 {
733 int i;
734 for (i = npols - 1; i >= 0; --i)
735 xfrm_pol_put(pols[i]);
736 }
737 #else
738 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
739 {
740 xfrm_pol_put(pols[0]);
741 }
742 #endif
743
744 extern void __xfrm_state_destroy(struct xfrm_state *);
745
746 static inline void __xfrm_state_put(struct xfrm_state *x)
747 {
748 atomic_dec(&x->refcnt);
749 }
750
751 static inline void xfrm_state_put(struct xfrm_state *x)
752 {
753 if (atomic_dec_and_test(&x->refcnt))
754 __xfrm_state_destroy(x);
755 }
756
757 static inline void xfrm_state_hold(struct xfrm_state *x)
758 {
759 atomic_inc(&x->refcnt);
760 }
761
762 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
763 {
764 __be32 *a1 = token1;
765 __be32 *a2 = token2;
766 int pdw;
767 int pbi;
768
769 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
770 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
771
772 if (pdw)
773 if (memcmp(a1, a2, pdw << 2))
774 return 0;
775
776 if (pbi) {
777 __be32 mask;
778
779 mask = htonl((0xffffffff) << (32 - pbi));
780
781 if ((a1[pdw] ^ a2[pdw]) & mask)
782 return 0;
783 }
784
785 return 1;
786 }
787
788 static __inline__
789 __be16 xfrm_flowi_sport(struct flowi *fl)
790 {
791 __be16 port;
792 switch(fl->proto) {
793 case IPPROTO_TCP:
794 case IPPROTO_UDP:
795 case IPPROTO_UDPLITE:
796 case IPPROTO_SCTP:
797 port = fl->fl_ip_sport;
798 break;
799 case IPPROTO_ICMP:
800 case IPPROTO_ICMPV6:
801 port = htons(fl->fl_icmp_type);
802 break;
803 case IPPROTO_MH:
804 port = htons(fl->fl_mh_type);
805 break;
806 default:
807 port = 0; /*XXX*/
808 }
809 return port;
810 }
811
812 static __inline__
813 __be16 xfrm_flowi_dport(struct flowi *fl)
814 {
815 __be16 port;
816 switch(fl->proto) {
817 case IPPROTO_TCP:
818 case IPPROTO_UDP:
819 case IPPROTO_UDPLITE:
820 case IPPROTO_SCTP:
821 port = fl->fl_ip_dport;
822 break;
823 case IPPROTO_ICMP:
824 case IPPROTO_ICMPV6:
825 port = htons(fl->fl_icmp_code);
826 break;
827 default:
828 port = 0; /*XXX*/
829 }
830 return port;
831 }
832
833 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
834 unsigned short family);
835
836 #ifdef CONFIG_SECURITY_NETWORK_XFRM
837 /* If neither has a context --> match
838 * Otherwise, both must have a context and the sids, doi, alg must match
839 */
840 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
841 {
842 return ((!s1 && !s2) ||
843 (s1 && s2 &&
844 (s1->ctx_sid == s2->ctx_sid) &&
845 (s1->ctx_doi == s2->ctx_doi) &&
846 (s1->ctx_alg == s2->ctx_alg)));
847 }
848 #else
849 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
850 {
851 return 1;
852 }
853 #endif
854
855 /* A struct encoding bundle of transformations to apply to some set of flow.
856 *
857 * dst->child points to the next element of bundle.
858 * dst->xfrm points to an instanse of transformer.
859 *
860 * Due to unfortunate limitations of current routing cache, which we
861 * have no time to fix, it mirrors struct rtable and bound to the same
862 * routing key, including saddr,daddr. However, we can have many of
863 * bundles differing by session id. All the bundles grow from a parent
864 * policy rule.
865 */
866 struct xfrm_dst
867 {
868 union {
869 struct dst_entry dst;
870 struct rtable rt;
871 struct rt6_info rt6;
872 } u;
873 struct dst_entry *route;
874 #ifdef CONFIG_XFRM_SUB_POLICY
875 struct flowi *origin;
876 struct xfrm_selector *partner;
877 #endif
878 u32 genid;
879 u32 route_mtu_cached;
880 u32 child_mtu_cached;
881 u32 route_cookie;
882 u32 path_cookie;
883 };
884
885 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
886 {
887 dst_release(xdst->route);
888 if (likely(xdst->u.dst.xfrm))
889 xfrm_state_put(xdst->u.dst.xfrm);
890 #ifdef CONFIG_XFRM_SUB_POLICY
891 kfree(xdst->origin);
892 xdst->origin = NULL;
893 kfree(xdst->partner);
894 xdst->partner = NULL;
895 #endif
896 }
897
898 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
899
900 struct sec_path
901 {
902 atomic_t refcnt;
903 int len;
904 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
905 };
906
907 static inline struct sec_path *
908 secpath_get(struct sec_path *sp)
909 {
910 if (sp)
911 atomic_inc(&sp->refcnt);
912 return sp;
913 }
914
915 extern void __secpath_destroy(struct sec_path *sp);
916
917 static inline void
918 secpath_put(struct sec_path *sp)
919 {
920 if (sp && atomic_dec_and_test(&sp->refcnt))
921 __secpath_destroy(sp);
922 }
923
924 extern struct sec_path *secpath_dup(struct sec_path *src);
925
926 static inline void
927 secpath_reset(struct sk_buff *skb)
928 {
929 #ifdef CONFIG_XFRM
930 secpath_put(skb->sp);
931 skb->sp = NULL;
932 #endif
933 }
934
935 static inline int
936 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
937 {
938 switch (family) {
939 case AF_INET:
940 return addr->a4 == 0;
941 case AF_INET6:
942 return ipv6_addr_any((struct in6_addr *)&addr->a6);
943 }
944 return 0;
945 }
946
947 static inline int
948 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
949 {
950 return (tmpl->saddr.a4 &&
951 tmpl->saddr.a4 != x->props.saddr.a4);
952 }
953
954 static inline int
955 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
956 {
957 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
958 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
959 }
960
961 static inline int
962 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
963 {
964 switch (family) {
965 case AF_INET:
966 return __xfrm4_state_addr_cmp(tmpl, x);
967 case AF_INET6:
968 return __xfrm6_state_addr_cmp(tmpl, x);
969 }
970 return !0;
971 }
972
973 #ifdef CONFIG_XFRM
974 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
975
976 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
977 struct sk_buff *skb,
978 unsigned int family, int reverse)
979 {
980 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
981
982 if (sk && sk->sk_policy[XFRM_POLICY_IN])
983 return __xfrm_policy_check(sk, ndir, skb, family);
984
985 return (!xfrm_policy_count[dir] && !skb->sp) ||
986 (skb->dst->flags & DST_NOPOLICY) ||
987 __xfrm_policy_check(sk, ndir, skb, family);
988 }
989
990 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
991 {
992 return __xfrm_policy_check2(sk, dir, skb, family, 0);
993 }
994
995 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
996 {
997 return xfrm_policy_check(sk, dir, skb, AF_INET);
998 }
999
1000 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1001 {
1002 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1003 }
1004
1005 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1006 struct sk_buff *skb)
1007 {
1008 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1009 }
1010
1011 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1012 struct sk_buff *skb)
1013 {
1014 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1015 }
1016
1017 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1018 unsigned int family, int reverse);
1019
1020 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1021 unsigned int family)
1022 {
1023 return __xfrm_decode_session(skb, fl, family, 0);
1024 }
1025
1026 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1027 struct flowi *fl,
1028 unsigned int family)
1029 {
1030 return __xfrm_decode_session(skb, fl, family, 1);
1031 }
1032
1033 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1034
1035 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1036 {
1037 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
1038 (skb->dst->flags & DST_NOXFRM) ||
1039 __xfrm_route_forward(skb, family);
1040 }
1041
1042 static inline int xfrm4_route_forward(struct sk_buff *skb)
1043 {
1044 return xfrm_route_forward(skb, AF_INET);
1045 }
1046
1047 static inline int xfrm6_route_forward(struct sk_buff *skb)
1048 {
1049 return xfrm_route_forward(skb, AF_INET6);
1050 }
1051
1052 extern int __xfrm_sk_clone_policy(struct sock *sk);
1053
1054 static inline int xfrm_sk_clone_policy(struct sock *sk)
1055 {
1056 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1057 return __xfrm_sk_clone_policy(sk);
1058 return 0;
1059 }
1060
1061 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1062
1063 static inline void xfrm_sk_free_policy(struct sock *sk)
1064 {
1065 if (unlikely(sk->sk_policy[0] != NULL)) {
1066 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1067 sk->sk_policy[0] = NULL;
1068 }
1069 if (unlikely(sk->sk_policy[1] != NULL)) {
1070 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1071 sk->sk_policy[1] = NULL;
1072 }
1073 }
1074
1075 #else
1076
1077 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1078 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1079 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1080 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1081 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1082 {
1083 return 1;
1084 }
1085 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1086 {
1087 return 1;
1088 }
1089 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1090 {
1091 return 1;
1092 }
1093 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1094 struct flowi *fl,
1095 unsigned int family)
1096 {
1097 return -ENOSYS;
1098 }
1099 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1100 struct sk_buff *skb)
1101 {
1102 return 1;
1103 }
1104 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1105 struct sk_buff *skb)
1106 {
1107 return 1;
1108 }
1109 #endif
1110
1111 static __inline__
1112 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1113 {
1114 switch (family){
1115 case AF_INET:
1116 return (xfrm_address_t *)&fl->fl4_dst;
1117 case AF_INET6:
1118 return (xfrm_address_t *)&fl->fl6_dst;
1119 }
1120 return NULL;
1121 }
1122
1123 static __inline__
1124 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1125 {
1126 switch (family){
1127 case AF_INET:
1128 return (xfrm_address_t *)&fl->fl4_src;
1129 case AF_INET6:
1130 return (xfrm_address_t *)&fl->fl6_src;
1131 }
1132 return NULL;
1133 }
1134
1135 static __inline__
1136 void xfrm_flowi_addr_get(struct flowi *fl,
1137 xfrm_address_t *saddr, xfrm_address_t *daddr,
1138 unsigned short family)
1139 {
1140 switch(family) {
1141 case AF_INET:
1142 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1143 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1144 break;
1145 case AF_INET6:
1146 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1147 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1148 break;
1149 }
1150 }
1151
1152 static __inline__ int
1153 __xfrm4_state_addr_check(struct xfrm_state *x,
1154 xfrm_address_t *daddr, xfrm_address_t *saddr)
1155 {
1156 if (daddr->a4 == x->id.daddr.a4 &&
1157 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1158 return 1;
1159 return 0;
1160 }
1161
1162 static __inline__ int
1163 __xfrm6_state_addr_check(struct xfrm_state *x,
1164 xfrm_address_t *daddr, xfrm_address_t *saddr)
1165 {
1166 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1167 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1168 ipv6_addr_any((struct in6_addr *)saddr) ||
1169 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1170 return 1;
1171 return 0;
1172 }
1173
1174 static __inline__ int
1175 xfrm_state_addr_check(struct xfrm_state *x,
1176 xfrm_address_t *daddr, xfrm_address_t *saddr,
1177 unsigned short family)
1178 {
1179 switch (family) {
1180 case AF_INET:
1181 return __xfrm4_state_addr_check(x, daddr, saddr);
1182 case AF_INET6:
1183 return __xfrm6_state_addr_check(x, daddr, saddr);
1184 }
1185 return 0;
1186 }
1187
1188 static __inline__ int
1189 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1190 unsigned short family)
1191 {
1192 switch (family) {
1193 case AF_INET:
1194 return __xfrm4_state_addr_check(x,
1195 (xfrm_address_t *)&fl->fl4_dst,
1196 (xfrm_address_t *)&fl->fl4_src);
1197 case AF_INET6:
1198 return __xfrm6_state_addr_check(x,
1199 (xfrm_address_t *)&fl->fl6_dst,
1200 (xfrm_address_t *)&fl->fl6_src);
1201 }
1202 return 0;
1203 }
1204
1205 static inline int xfrm_state_kern(struct xfrm_state *x)
1206 {
1207 return atomic_read(&x->tunnel_users);
1208 }
1209
1210 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1211 {
1212 return (!userproto || proto == userproto ||
1213 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1214 proto == IPPROTO_ESP ||
1215 proto == IPPROTO_COMP)));
1216 }
1217
1218 /*
1219 * xfrm algorithm information
1220 */
1221 struct xfrm_algo_aead_info {
1222 u16 icv_truncbits;
1223 };
1224
1225 struct xfrm_algo_auth_info {
1226 u16 icv_truncbits;
1227 u16 icv_fullbits;
1228 };
1229
1230 struct xfrm_algo_encr_info {
1231 u16 blockbits;
1232 u16 defkeybits;
1233 };
1234
1235 struct xfrm_algo_comp_info {
1236 u16 threshold;
1237 };
1238
1239 struct xfrm_algo_desc {
1240 char *name;
1241 char *compat;
1242 u8 available:1;
1243 union {
1244 struct xfrm_algo_aead_info aead;
1245 struct xfrm_algo_auth_info auth;
1246 struct xfrm_algo_encr_info encr;
1247 struct xfrm_algo_comp_info comp;
1248 } uinfo;
1249 struct sadb_alg desc;
1250 };
1251
1252 /* XFRM tunnel handlers. */
1253 struct xfrm_tunnel {
1254 int (*handler)(struct sk_buff *skb);
1255 int (*err_handler)(struct sk_buff *skb, __u32 info);
1256
1257 struct xfrm_tunnel *next;
1258 int priority;
1259 };
1260
1261 struct xfrm6_tunnel {
1262 int (*handler)(struct sk_buff *skb);
1263 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1264 int type, int code, int offset, __be32 info);
1265 struct xfrm6_tunnel *next;
1266 int priority;
1267 };
1268
1269 extern void xfrm_init(void);
1270 extern void xfrm4_init(void);
1271 extern void xfrm_state_init(void);
1272 extern void xfrm4_state_init(void);
1273 #ifdef CONFIG_XFRM
1274 extern int xfrm6_init(void);
1275 extern void xfrm6_fini(void);
1276 extern int xfrm6_state_init(void);
1277 extern void xfrm6_state_fini(void);
1278 #else
1279 static inline int xfrm6_init(void)
1280 {
1281 return 0;
1282 }
1283 static inline void xfrm6_fini(void)
1284 {
1285 ;
1286 }
1287 #endif
1288
1289 #ifdef CONFIG_XFRM_STATISTICS
1290 extern int xfrm_proc_init(void);
1291 #endif
1292
1293 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1294 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1295 int (*func)(struct xfrm_state *, int, void*), void *);
1296 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1297 extern struct xfrm_state *xfrm_state_alloc(void);
1298 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1299 struct flowi *fl, struct xfrm_tmpl *tmpl,
1300 struct xfrm_policy *pol, int *err,
1301 unsigned short family);
1302 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1303 xfrm_address_t *saddr,
1304 unsigned short family,
1305 u8 mode, u8 proto, u32 reqid);
1306 extern int xfrm_state_check_expire(struct xfrm_state *x);
1307 extern void xfrm_state_insert(struct xfrm_state *x);
1308 extern int xfrm_state_add(struct xfrm_state *x);
1309 extern int xfrm_state_update(struct xfrm_state *x);
1310 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1311 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1312 #ifdef CONFIG_XFRM_SUB_POLICY
1313 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1314 int n, unsigned short family);
1315 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1316 int n, unsigned short family);
1317 #else
1318 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1319 int n, unsigned short family)
1320 {
1321 return -ENOSYS;
1322 }
1323
1324 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1325 int n, unsigned short family)
1326 {
1327 return -ENOSYS;
1328 }
1329 #endif
1330
1331 struct xfrmk_sadinfo {
1332 u32 sadhcnt; /* current hash bkts */
1333 u32 sadhmcnt; /* max allowed hash bkts */
1334 u32 sadcnt; /* current running count */
1335 };
1336
1337 struct xfrmk_spdinfo {
1338 u32 incnt;
1339 u32 outcnt;
1340 u32 fwdcnt;
1341 u32 inscnt;
1342 u32 outscnt;
1343 u32 fwdscnt;
1344 u32 spdhcnt;
1345 u32 spdhmcnt;
1346 };
1347
1348 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1349 extern int xfrm_state_delete(struct xfrm_state *x);
1350 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1351 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1352 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1353 extern int xfrm_replay_check(struct xfrm_state *x,
1354 struct sk_buff *skb, __be32 seq);
1355 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1356 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1357 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1358 extern int xfrm_init_state(struct xfrm_state *x);
1359 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1360 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1361 int encap_type);
1362 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1363 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1364 extern int xfrm_output(struct sk_buff *skb);
1365 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1366 extern int xfrm4_extract_header(struct sk_buff *skb);
1367 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1368 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1369 int encap_type);
1370 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1371 extern int xfrm4_rcv(struct sk_buff *skb);
1372
1373 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1374 {
1375 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1376 }
1377
1378 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1379 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1380 extern int xfrm4_output(struct sk_buff *skb);
1381 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1382 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1383 extern int xfrm6_extract_header(struct sk_buff *skb);
1384 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1385 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1386 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1387 extern int xfrm6_rcv(struct sk_buff *skb);
1388 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1389 xfrm_address_t *saddr, u8 proto);
1390 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1391 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1392 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1393 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1394 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1395 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1396 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1397 extern int xfrm6_output(struct sk_buff *skb);
1398 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1399 u8 **prevhdr);
1400
1401 #ifdef CONFIG_XFRM
1402 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1403 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1404 #else
1405 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1406 {
1407 return -ENOPROTOOPT;
1408 }
1409
1410 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1411 {
1412 /* should not happen */
1413 kfree_skb(skb);
1414 return 0;
1415 }
1416 #endif
1417
1418 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1419
1420 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1421 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1422 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1423 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1424 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1425 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1426 struct xfrm_selector *sel,
1427 struct xfrm_sec_ctx *ctx, int delete,
1428 int *err);
1429 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1430 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1431 u32 xfrm_get_acqseq(void);
1432 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1433 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1434 xfrm_address_t *daddr, xfrm_address_t *saddr,
1435 int create, unsigned short family);
1436 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1437 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1438 struct flowi *fl, int family, int strict);
1439
1440 #ifdef CONFIG_XFRM_MIGRATE
1441 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1442 struct xfrm_migrate *m, int num_bundles,
1443 struct xfrm_kmaddress *k);
1444 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1445 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1446 struct xfrm_migrate *m);
1447 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1448 struct xfrm_migrate *m, int num_bundles,
1449 struct xfrm_kmaddress *k);
1450 #endif
1451
1452 extern wait_queue_head_t km_waitq;
1453 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1454 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1455 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1456
1457 extern void xfrm_input_init(void);
1458 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1459
1460 extern void xfrm_probe_algs(void);
1461 extern int xfrm_count_auth_supported(void);
1462 extern int xfrm_count_enc_supported(void);
1463 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1464 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1465 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1466 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1467 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1468 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1469 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1470 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1471 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1472 int probe);
1473
1474 struct hash_desc;
1475 struct scatterlist;
1476 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1477 unsigned int);
1478
1479 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1480 int offset, int len, icv_update_fn_t icv_update);
1481
1482 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1483 int family)
1484 {
1485 switch (family) {
1486 default:
1487 case AF_INET:
1488 return (__force __u32)a->a4 - (__force __u32)b->a4;
1489 case AF_INET6:
1490 return ipv6_addr_cmp((struct in6_addr *)a,
1491 (struct in6_addr *)b);
1492 }
1493 }
1494
1495 static inline int xfrm_policy_id2dir(u32 index)
1496 {
1497 return index & 7;
1498 }
1499
1500 static inline int xfrm_aevent_is_on(void)
1501 {
1502 struct sock *nlsk;
1503 int ret = 0;
1504
1505 rcu_read_lock();
1506 nlsk = rcu_dereference(xfrm_nl);
1507 if (nlsk)
1508 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1509 rcu_read_unlock();
1510 return ret;
1511 }
1512
1513 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1514 {
1515 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1516 }
1517
1518 #ifdef CONFIG_XFRM_MIGRATE
1519 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1520 {
1521 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1522 }
1523
1524 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1525 {
1526 int i;
1527 for (i = 0; i < n; i++)
1528 xfrm_state_put(*(states + i));
1529 }
1530
1531 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1532 {
1533 int i;
1534 for (i = 0; i < n; i++)
1535 xfrm_state_delete(*(states + i));
1536 }
1537 #endif
1538
1539 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1540 {
1541 return skb->sp->xvec[skb->sp->len - 1];
1542 }
1543
1544 #endif /* _NET_XFRM_H */
Linux kernel - Deliverables
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