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ipsec: Put dumpers on the dump list
[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_migrate {
496 xfrm_address_t old_daddr;
497 xfrm_address_t old_saddr;
498 xfrm_address_t new_daddr;
499 xfrm_address_t new_saddr;
500 u8 proto;
501 u8 mode;
502 u16 reserved;
503 u32 reqid;
504 u16 old_family;
505 u16 new_family;
506 };
507
508 #define XFRM_KM_TIMEOUT 30
509 /* which seqno */
510 #define XFRM_REPLAY_SEQ 1
511 #define XFRM_REPLAY_OSEQ 2
512 #define XFRM_REPLAY_SEQ_MASK 3
513 /* what happened */
514 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
515 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
516
517 /* default aevent timeout in units of 100ms */
518 #define XFRM_AE_ETIME 10
519 /* Async Event timer multiplier */
520 #define XFRM_AE_ETH_M 10
521 /* default seq threshold size */
522 #define XFRM_AE_SEQT_SIZE 2
523
524 struct xfrm_mgr
525 {
526 struct list_head list;
527 char *id;
528 int (*notify)(struct xfrm_state *x, struct km_event *c);
529 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
530 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
531 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
532 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
533 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
534 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
535 };
536
537 extern int xfrm_register_km(struct xfrm_mgr *km);
538 extern int xfrm_unregister_km(struct xfrm_mgr *km);
539
540 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
541
542 /*
543 * This structure is used for the duration where packets are being
544 * transformed by IPsec. As soon as the packet leaves IPsec the
545 * area beyond the generic IP part may be overwritten.
546 */
547 struct xfrm_skb_cb {
548 union {
549 struct inet_skb_parm h4;
550 struct inet6_skb_parm h6;
551 } header;
552
553 /* Sequence number for replay protection. */
554 union {
555 u64 output;
556 __be32 input;
557 } seq;
558 };
559
560 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
561
562 /*
563 * This structure is used by the afinfo prepare_input/prepare_output functions
564 * to transmit header information to the mode input/output functions.
565 */
566 struct xfrm_mode_skb_cb {
567 union {
568 struct inet_skb_parm h4;
569 struct inet6_skb_parm h6;
570 } header;
571
572 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
573 __be16 id;
574 __be16 frag_off;
575
576 /* IP header length (excluding options or extension headers). */
577 u8 ihl;
578
579 /* TOS for IPv4, class for IPv6. */
580 u8 tos;
581
582 /* TTL for IPv4, hop limitfor IPv6. */
583 u8 ttl;
584
585 /* Protocol for IPv4, NH for IPv6. */
586 u8 protocol;
587
588 /* Option length for IPv4, zero for IPv6. */
589 u8 optlen;
590
591 /* Used by IPv6 only, zero for IPv4. */
592 u8 flow_lbl[3];
593 };
594
595 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
596
597 /*
598 * This structure is used by the input processing to locate the SPI and
599 * related information.
600 */
601 struct xfrm_spi_skb_cb {
602 union {
603 struct inet_skb_parm h4;
604 struct inet6_skb_parm h6;
605 } header;
606
607 unsigned int daddroff;
608 unsigned int family;
609 };
610
611 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
612
613 /* Audit Information */
614 struct xfrm_audit
615 {
616 u32 secid;
617 uid_t loginuid;
618 u32 sessionid;
619 };
620
621 #ifdef CONFIG_AUDITSYSCALL
622 static inline struct audit_buffer *xfrm_audit_start(const char *op)
623 {
624 struct audit_buffer *audit_buf = NULL;
625
626 if (audit_enabled == 0)
627 return NULL;
628 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
629 AUDIT_MAC_IPSEC_EVENT);
630 if (audit_buf == NULL)
631 return NULL;
632 audit_log_format(audit_buf, "op=%s", op);
633 return audit_buf;
634 }
635
636 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
637 struct audit_buffer *audit_buf)
638 {
639 char *secctx;
640 u32 secctx_len;
641
642 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
643 if (secid != 0 &&
644 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
645 audit_log_format(audit_buf, " subj=%s", secctx);
646 security_release_secctx(secctx, secctx_len);
647 } else
648 audit_log_task_context(audit_buf);
649 }
650
651 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
652 u32 auid, u32 ses, u32 secid);
653 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
654 u32 auid, u32 ses, u32 secid);
655 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
656 u32 auid, u32 ses, u32 secid);
657 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
658 u32 auid, u32 ses, u32 secid);
659 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
660 struct sk_buff *skb);
661 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
662 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
663 __be32 net_spi, __be32 net_seq);
664 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
665 struct sk_buff *skb, u8 proto);
666 #else
667
668 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
669 u32 auid, u32 ses, u32 secid)
670 {
671 }
672
673 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
674 u32 auid, u32 ses, u32 secid)
675 {
676 }
677
678 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
679 u32 auid, u32 ses, u32 secid)
680 {
681 }
682
683 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
684 u32 auid, u32 ses, u32 secid)
685 {
686 }
687
688 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
689 struct sk_buff *skb)
690 {
691 }
692
693 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
694 u16 family)
695 {
696 }
697
698 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
699 __be32 net_spi, __be32 net_seq)
700 {
701 }
702
703 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
704 struct sk_buff *skb, u8 proto)
705 {
706 }
707 #endif /* CONFIG_AUDITSYSCALL */
708
709 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
710 {
711 if (likely(policy != NULL))
712 atomic_inc(&policy->refcnt);
713 }
714
715 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
716
717 static inline void xfrm_pol_put(struct xfrm_policy *policy)
718 {
719 if (atomic_dec_and_test(&policy->refcnt))
720 xfrm_policy_destroy(policy);
721 }
722
723 #ifdef CONFIG_XFRM_SUB_POLICY
724 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
725 {
726 int i;
727 for (i = npols - 1; i >= 0; --i)
728 xfrm_pol_put(pols[i]);
729 }
730 #else
731 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
732 {
733 xfrm_pol_put(pols[0]);
734 }
735 #endif
736
737 extern void __xfrm_state_destroy(struct xfrm_state *);
738
739 static inline void __xfrm_state_put(struct xfrm_state *x)
740 {
741 atomic_dec(&x->refcnt);
742 }
743
744 static inline void xfrm_state_put(struct xfrm_state *x)
745 {
746 if (atomic_dec_and_test(&x->refcnt))
747 __xfrm_state_destroy(x);
748 }
749
750 static inline void xfrm_state_hold(struct xfrm_state *x)
751 {
752 atomic_inc(&x->refcnt);
753 }
754
755 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
756 {
757 __be32 *a1 = token1;
758 __be32 *a2 = token2;
759 int pdw;
760 int pbi;
761
762 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
763 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
764
765 if (pdw)
766 if (memcmp(a1, a2, pdw << 2))
767 return 0;
768
769 if (pbi) {
770 __be32 mask;
771
772 mask = htonl((0xffffffff) << (32 - pbi));
773
774 if ((a1[pdw] ^ a2[pdw]) & mask)
775 return 0;
776 }
777
778 return 1;
779 }
780
781 static __inline__
782 __be16 xfrm_flowi_sport(struct flowi *fl)
783 {
784 __be16 port;
785 switch(fl->proto) {
786 case IPPROTO_TCP:
787 case IPPROTO_UDP:
788 case IPPROTO_UDPLITE:
789 case IPPROTO_SCTP:
790 port = fl->fl_ip_sport;
791 break;
792 case IPPROTO_ICMP:
793 case IPPROTO_ICMPV6:
794 port = htons(fl->fl_icmp_type);
795 break;
796 case IPPROTO_MH:
797 port = htons(fl->fl_mh_type);
798 break;
799 default:
800 port = 0; /*XXX*/
801 }
802 return port;
803 }
804
805 static __inline__
806 __be16 xfrm_flowi_dport(struct flowi *fl)
807 {
808 __be16 port;
809 switch(fl->proto) {
810 case IPPROTO_TCP:
811 case IPPROTO_UDP:
812 case IPPROTO_UDPLITE:
813 case IPPROTO_SCTP:
814 port = fl->fl_ip_dport;
815 break;
816 case IPPROTO_ICMP:
817 case IPPROTO_ICMPV6:
818 port = htons(fl->fl_icmp_code);
819 break;
820 default:
821 port = 0; /*XXX*/
822 }
823 return port;
824 }
825
826 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
827 unsigned short family);
828
829 #ifdef CONFIG_SECURITY_NETWORK_XFRM
830 /* If neither has a context --> match
831 * Otherwise, both must have a context and the sids, doi, alg must match
832 */
833 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
834 {
835 return ((!s1 && !s2) ||
836 (s1 && s2 &&
837 (s1->ctx_sid == s2->ctx_sid) &&
838 (s1->ctx_doi == s2->ctx_doi) &&
839 (s1->ctx_alg == s2->ctx_alg)));
840 }
841 #else
842 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
843 {
844 return 1;
845 }
846 #endif
847
848 /* A struct encoding bundle of transformations to apply to some set of flow.
849 *
850 * dst->child points to the next element of bundle.
851 * dst->xfrm points to an instanse of transformer.
852 *
853 * Due to unfortunate limitations of current routing cache, which we
854 * have no time to fix, it mirrors struct rtable and bound to the same
855 * routing key, including saddr,daddr. However, we can have many of
856 * bundles differing by session id. All the bundles grow from a parent
857 * policy rule.
858 */
859 struct xfrm_dst
860 {
861 union {
862 struct dst_entry dst;
863 struct rtable rt;
864 struct rt6_info rt6;
865 } u;
866 struct dst_entry *route;
867 #ifdef CONFIG_XFRM_SUB_POLICY
868 struct flowi *origin;
869 struct xfrm_selector *partner;
870 #endif
871 u32 genid;
872 u32 route_mtu_cached;
873 u32 child_mtu_cached;
874 u32 route_cookie;
875 u32 path_cookie;
876 };
877
878 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
879 {
880 dst_release(xdst->route);
881 if (likely(xdst->u.dst.xfrm))
882 xfrm_state_put(xdst->u.dst.xfrm);
883 #ifdef CONFIG_XFRM_SUB_POLICY
884 kfree(xdst->origin);
885 xdst->origin = NULL;
886 kfree(xdst->partner);
887 xdst->partner = NULL;
888 #endif
889 }
890
891 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
892
893 struct sec_path
894 {
895 atomic_t refcnt;
896 int len;
897 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
898 };
899
900 static inline struct sec_path *
901 secpath_get(struct sec_path *sp)
902 {
903 if (sp)
904 atomic_inc(&sp->refcnt);
905 return sp;
906 }
907
908 extern void __secpath_destroy(struct sec_path *sp);
909
910 static inline void
911 secpath_put(struct sec_path *sp)
912 {
913 if (sp && atomic_dec_and_test(&sp->refcnt))
914 __secpath_destroy(sp);
915 }
916
917 extern struct sec_path *secpath_dup(struct sec_path *src);
918
919 static inline void
920 secpath_reset(struct sk_buff *skb)
921 {
922 #ifdef CONFIG_XFRM
923 secpath_put(skb->sp);
924 skb->sp = NULL;
925 #endif
926 }
927
928 static inline int
929 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
930 {
931 switch (family) {
932 case AF_INET:
933 return addr->a4 == 0;
934 case AF_INET6:
935 return ipv6_addr_any((struct in6_addr *)&addr->a6);
936 }
937 return 0;
938 }
939
940 static inline int
941 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
942 {
943 return (tmpl->saddr.a4 &&
944 tmpl->saddr.a4 != x->props.saddr.a4);
945 }
946
947 static inline int
948 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
949 {
950 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
951 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
952 }
953
954 static inline int
955 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
956 {
957 switch (family) {
958 case AF_INET:
959 return __xfrm4_state_addr_cmp(tmpl, x);
960 case AF_INET6:
961 return __xfrm6_state_addr_cmp(tmpl, x);
962 }
963 return !0;
964 }
965
966 #ifdef CONFIG_XFRM
967 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
968
969 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
970 struct sk_buff *skb,
971 unsigned int family, int reverse)
972 {
973 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
974
975 if (sk && sk->sk_policy[XFRM_POLICY_IN])
976 return __xfrm_policy_check(sk, ndir, skb, family);
977
978 return (!xfrm_policy_count[dir] && !skb->sp) ||
979 (skb->dst->flags & DST_NOPOLICY) ||
980 __xfrm_policy_check(sk, ndir, skb, family);
981 }
982
983 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
984 {
985 return __xfrm_policy_check2(sk, dir, skb, family, 0);
986 }
987
988 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
989 {
990 return xfrm_policy_check(sk, dir, skb, AF_INET);
991 }
992
993 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
994 {
995 return xfrm_policy_check(sk, dir, skb, AF_INET6);
996 }
997
998 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
999 struct sk_buff *skb)
1000 {
1001 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1002 }
1003
1004 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1005 struct sk_buff *skb)
1006 {
1007 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1008 }
1009
1010 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1011 unsigned int family, int reverse);
1012
1013 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1014 unsigned int family)
1015 {
1016 return __xfrm_decode_session(skb, fl, family, 0);
1017 }
1018
1019 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1020 struct flowi *fl,
1021 unsigned int family)
1022 {
1023 return __xfrm_decode_session(skb, fl, family, 1);
1024 }
1025
1026 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1027
1028 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1029 {
1030 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
1031 (skb->dst->flags & DST_NOXFRM) ||
1032 __xfrm_route_forward(skb, family);
1033 }
1034
1035 static inline int xfrm4_route_forward(struct sk_buff *skb)
1036 {
1037 return xfrm_route_forward(skb, AF_INET);
1038 }
1039
1040 static inline int xfrm6_route_forward(struct sk_buff *skb)
1041 {
1042 return xfrm_route_forward(skb, AF_INET6);
1043 }
1044
1045 extern int __xfrm_sk_clone_policy(struct sock *sk);
1046
1047 static inline int xfrm_sk_clone_policy(struct sock *sk)
1048 {
1049 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1050 return __xfrm_sk_clone_policy(sk);
1051 return 0;
1052 }
1053
1054 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1055
1056 static inline void xfrm_sk_free_policy(struct sock *sk)
1057 {
1058 if (unlikely(sk->sk_policy[0] != NULL)) {
1059 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1060 sk->sk_policy[0] = NULL;
1061 }
1062 if (unlikely(sk->sk_policy[1] != NULL)) {
1063 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1064 sk->sk_policy[1] = NULL;
1065 }
1066 }
1067
1068 #else
1069
1070 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1071 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1072 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1073 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1074 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1075 {
1076 return 1;
1077 }
1078 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1079 {
1080 return 1;
1081 }
1082 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1083 {
1084 return 1;
1085 }
1086 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1087 struct flowi *fl,
1088 unsigned int family)
1089 {
1090 return -ENOSYS;
1091 }
1092 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1093 struct sk_buff *skb)
1094 {
1095 return 1;
1096 }
1097 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1098 struct sk_buff *skb)
1099 {
1100 return 1;
1101 }
1102 #endif
1103
1104 static __inline__
1105 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1106 {
1107 switch (family){
1108 case AF_INET:
1109 return (xfrm_address_t *)&fl->fl4_dst;
1110 case AF_INET6:
1111 return (xfrm_address_t *)&fl->fl6_dst;
1112 }
1113 return NULL;
1114 }
1115
1116 static __inline__
1117 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1118 {
1119 switch (family){
1120 case AF_INET:
1121 return (xfrm_address_t *)&fl->fl4_src;
1122 case AF_INET6:
1123 return (xfrm_address_t *)&fl->fl6_src;
1124 }
1125 return NULL;
1126 }
1127
1128 static __inline__
1129 void xfrm_flowi_addr_get(struct flowi *fl,
1130 xfrm_address_t *saddr, xfrm_address_t *daddr,
1131 unsigned short family)
1132 {
1133 switch(family) {
1134 case AF_INET:
1135 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1136 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1137 break;
1138 case AF_INET6:
1139 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1140 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1141 break;
1142 }
1143 }
1144
1145 static __inline__ int
1146 __xfrm4_state_addr_check(struct xfrm_state *x,
1147 xfrm_address_t *daddr, xfrm_address_t *saddr)
1148 {
1149 if (daddr->a4 == x->id.daddr.a4 &&
1150 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1151 return 1;
1152 return 0;
1153 }
1154
1155 static __inline__ int
1156 __xfrm6_state_addr_check(struct xfrm_state *x,
1157 xfrm_address_t *daddr, xfrm_address_t *saddr)
1158 {
1159 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1160 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1161 ipv6_addr_any((struct in6_addr *)saddr) ||
1162 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1163 return 1;
1164 return 0;
1165 }
1166
1167 static __inline__ int
1168 xfrm_state_addr_check(struct xfrm_state *x,
1169 xfrm_address_t *daddr, xfrm_address_t *saddr,
1170 unsigned short family)
1171 {
1172 switch (family) {
1173 case AF_INET:
1174 return __xfrm4_state_addr_check(x, daddr, saddr);
1175 case AF_INET6:
1176 return __xfrm6_state_addr_check(x, daddr, saddr);
1177 }
1178 return 0;
1179 }
1180
1181 static __inline__ int
1182 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1183 unsigned short family)
1184 {
1185 switch (family) {
1186 case AF_INET:
1187 return __xfrm4_state_addr_check(x,
1188 (xfrm_address_t *)&fl->fl4_dst,
1189 (xfrm_address_t *)&fl->fl4_src);
1190 case AF_INET6:
1191 return __xfrm6_state_addr_check(x,
1192 (xfrm_address_t *)&fl->fl6_dst,
1193 (xfrm_address_t *)&fl->fl6_src);
1194 }
1195 return 0;
1196 }
1197
1198 static inline int xfrm_state_kern(struct xfrm_state *x)
1199 {
1200 return atomic_read(&x->tunnel_users);
1201 }
1202
1203 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1204 {
1205 return (!userproto || proto == userproto ||
1206 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1207 proto == IPPROTO_ESP ||
1208 proto == IPPROTO_COMP)));
1209 }
1210
1211 /*
1212 * xfrm algorithm information
1213 */
1214 struct xfrm_algo_aead_info {
1215 u16 icv_truncbits;
1216 };
1217
1218 struct xfrm_algo_auth_info {
1219 u16 icv_truncbits;
1220 u16 icv_fullbits;
1221 };
1222
1223 struct xfrm_algo_encr_info {
1224 u16 blockbits;
1225 u16 defkeybits;
1226 };
1227
1228 struct xfrm_algo_comp_info {
1229 u16 threshold;
1230 };
1231
1232 struct xfrm_algo_desc {
1233 char *name;
1234 char *compat;
1235 u8 available:1;
1236 union {
1237 struct xfrm_algo_aead_info aead;
1238 struct xfrm_algo_auth_info auth;
1239 struct xfrm_algo_encr_info encr;
1240 struct xfrm_algo_comp_info comp;
1241 } uinfo;
1242 struct sadb_alg desc;
1243 };
1244
1245 /* XFRM tunnel handlers. */
1246 struct xfrm_tunnel {
1247 int (*handler)(struct sk_buff *skb);
1248 int (*err_handler)(struct sk_buff *skb, __u32 info);
1249
1250 struct xfrm_tunnel *next;
1251 int priority;
1252 };
1253
1254 struct xfrm6_tunnel {
1255 int (*handler)(struct sk_buff *skb);
1256 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1257 int type, int code, int offset, __be32 info);
1258 struct xfrm6_tunnel *next;
1259 int priority;
1260 };
1261
1262 extern void xfrm_init(void);
1263 extern void xfrm4_init(void);
1264 extern void xfrm_state_init(void);
1265 extern void xfrm4_state_init(void);
1266 #ifdef CONFIG_XFRM
1267 extern int xfrm6_init(void);
1268 extern void xfrm6_fini(void);
1269 extern int xfrm6_state_init(void);
1270 extern void xfrm6_state_fini(void);
1271 #else
1272 static inline int xfrm6_init(void)
1273 {
1274 return 0;
1275 }
1276 static inline void xfrm6_fini(void)
1277 {
1278 ;
1279 }
1280 #endif
1281
1282 #ifdef CONFIG_XFRM_STATISTICS
1283 extern int xfrm_proc_init(void);
1284 #endif
1285
1286 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1287 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1288 int (*func)(struct xfrm_state *, int, void*), void *);
1289 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1290 extern struct xfrm_state *xfrm_state_alloc(void);
1291 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1292 struct flowi *fl, struct xfrm_tmpl *tmpl,
1293 struct xfrm_policy *pol, int *err,
1294 unsigned short family);
1295 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1296 xfrm_address_t *saddr,
1297 unsigned short family,
1298 u8 mode, u8 proto, u32 reqid);
1299 extern int xfrm_state_check_expire(struct xfrm_state *x);
1300 extern void xfrm_state_insert(struct xfrm_state *x);
1301 extern int xfrm_state_add(struct xfrm_state *x);
1302 extern int xfrm_state_update(struct xfrm_state *x);
1303 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1304 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1305 #ifdef CONFIG_XFRM_SUB_POLICY
1306 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1307 int n, unsigned short family);
1308 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1309 int n, unsigned short family);
1310 #else
1311 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1312 int n, unsigned short family)
1313 {
1314 return -ENOSYS;
1315 }
1316
1317 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1318 int n, unsigned short family)
1319 {
1320 return -ENOSYS;
1321 }
1322 #endif
1323
1324 struct xfrmk_sadinfo {
1325 u32 sadhcnt; /* current hash bkts */
1326 u32 sadhmcnt; /* max allowed hash bkts */
1327 u32 sadcnt; /* current running count */
1328 };
1329
1330 struct xfrmk_spdinfo {
1331 u32 incnt;
1332 u32 outcnt;
1333 u32 fwdcnt;
1334 u32 inscnt;
1335 u32 outscnt;
1336 u32 fwdscnt;
1337 u32 spdhcnt;
1338 u32 spdhmcnt;
1339 };
1340
1341 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1342 extern int xfrm_state_delete(struct xfrm_state *x);
1343 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1344 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1345 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1346 extern int xfrm_replay_check(struct xfrm_state *x,
1347 struct sk_buff *skb, __be32 seq);
1348 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1349 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1350 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1351 extern int xfrm_init_state(struct xfrm_state *x);
1352 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1353 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1354 int encap_type);
1355 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1356 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1357 extern int xfrm_output(struct sk_buff *skb);
1358 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1359 extern int xfrm4_extract_header(struct sk_buff *skb);
1360 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1361 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1362 int encap_type);
1363 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1364 extern int xfrm4_rcv(struct sk_buff *skb);
1365
1366 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1367 {
1368 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1369 }
1370
1371 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1372 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1373 extern int xfrm4_output(struct sk_buff *skb);
1374 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1375 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1376 extern int xfrm6_extract_header(struct sk_buff *skb);
1377 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1378 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1379 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1380 extern int xfrm6_rcv(struct sk_buff *skb);
1381 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1382 xfrm_address_t *saddr, u8 proto);
1383 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1384 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1385 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1386 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1387 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1388 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1389 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1390 extern int xfrm6_output(struct sk_buff *skb);
1391 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1392 u8 **prevhdr);
1393
1394 #ifdef CONFIG_XFRM
1395 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1396 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1397 #else
1398 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1399 {
1400 return -ENOPROTOOPT;
1401 }
1402
1403 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1404 {
1405 /* should not happen */
1406 kfree_skb(skb);
1407 return 0;
1408 }
1409 #endif
1410
1411 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1412
1413 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1414 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1415 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1416 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1417 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1418 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1419 struct xfrm_selector *sel,
1420 struct xfrm_sec_ctx *ctx, int delete,
1421 int *err);
1422 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1423 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1424 u32 xfrm_get_acqseq(void);
1425 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1426 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1427 xfrm_address_t *daddr, xfrm_address_t *saddr,
1428 int create, unsigned short family);
1429 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1430 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1431 struct flowi *fl, int family, int strict);
1432
1433 #ifdef CONFIG_XFRM_MIGRATE
1434 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1435 struct xfrm_migrate *m, int num_bundles);
1436 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1437 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1438 struct xfrm_migrate *m);
1439 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1440 struct xfrm_migrate *m, int num_bundles);
1441 #endif
1442
1443 extern wait_queue_head_t km_waitq;
1444 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1445 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1446 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1447
1448 extern void xfrm_input_init(void);
1449 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1450
1451 extern void xfrm_probe_algs(void);
1452 extern int xfrm_count_auth_supported(void);
1453 extern int xfrm_count_enc_supported(void);
1454 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1455 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1456 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1457 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1458 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1459 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1460 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1461 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1462 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1463 int probe);
1464
1465 struct hash_desc;
1466 struct scatterlist;
1467 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1468 unsigned int);
1469
1470 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1471 int offset, int len, icv_update_fn_t icv_update);
1472
1473 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1474 int family)
1475 {
1476 switch (family) {
1477 default:
1478 case AF_INET:
1479 return (__force __u32)a->a4 - (__force __u32)b->a4;
1480 case AF_INET6:
1481 return ipv6_addr_cmp((struct in6_addr *)a,
1482 (struct in6_addr *)b);
1483 }
1484 }
1485
1486 static inline int xfrm_policy_id2dir(u32 index)
1487 {
1488 return index & 7;
1489 }
1490
1491 static inline int xfrm_aevent_is_on(void)
1492 {
1493 struct sock *nlsk;
1494 int ret = 0;
1495
1496 rcu_read_lock();
1497 nlsk = rcu_dereference(xfrm_nl);
1498 if (nlsk)
1499 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1500 rcu_read_unlock();
1501 return ret;
1502 }
1503
1504 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1505 {
1506 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1507 }
1508
1509 #ifdef CONFIG_XFRM_MIGRATE
1510 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1511 {
1512 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1513 }
1514
1515 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1516 {
1517 int i;
1518 for (i = 0; i < n; i++)
1519 xfrm_state_put(*(states + i));
1520 }
1521
1522 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1523 {
1524 int i;
1525 for (i = 0; i < n; i++)
1526 xfrm_state_delete(*(states + i));
1527 }
1528 #endif
1529
1530 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1531 {
1532 return skb->sp->xvec[skb->sp->len - 1];
1533 }
1534
1535 #endif /* _NET_XFRM_H */
Linux kernel - Deliverables
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