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