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retransmit send timing bugfix
[cor_2_6_31.git] / include / net / xfrm.h
blob9e3a3f4c1f6041bb3447392695f308cfcc5b2cc0
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 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
42 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
43 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
44 #else
45 #define XFRM_INC_STATS(net, field) ((void)(net))
46 #define XFRM_INC_STATS_BH(net, field) ((void)(net))
47 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
48 #endif
49
50 extern struct mutex xfrm_cfg_mutex;
51
52 /* Organization of SPD aka "XFRM rules"
53 ------------------------------------
54
55 Basic objects:
56 - policy rule, struct xfrm_policy (=SPD entry)
57 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
58 - instance of a transformer, struct xfrm_state (=SA)
59 - template to clone xfrm_state, struct xfrm_tmpl
60
61 SPD is plain linear list of xfrm_policy rules, ordered by priority.
62 (To be compatible with existing pfkeyv2 implementations,
63 many rules with priority of 0x7fffffff are allowed to exist and
64 such rules are ordered in an unpredictable way, thanks to bsd folks.)
65
66 Lookup is plain linear search until the first match with selector.
67
68 If "action" is "block", then we prohibit the flow, otherwise:
69 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
70 policy entry has list of up to XFRM_MAX_DEPTH transformations,
71 described by templates xfrm_tmpl. Each template is resolved
72 to a complete xfrm_state (see below) and we pack bundle of transformations
73 to a dst_entry returned to requestor.
74
75 dst -. xfrm .-> xfrm_state #1
76 |---. child .-> dst -. xfrm .-> xfrm_state #2
77 |---. child .-> dst -. xfrm .-> xfrm_state #3
78 |---. child .-> NULL
79
80 Bundles are cached at xrfm_policy struct (field ->bundles).
81
82
83 Resolution of xrfm_tmpl
84 -----------------------
85 Template contains:
86 1. ->mode Mode: transport or tunnel
87 2. ->id.proto Protocol: AH/ESP/IPCOMP
88 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
89 Q: allow to resolve security gateway?
90 4. ->id.spi If not zero, static SPI.
91 5. ->saddr Local tunnel endpoint, ignored for transport mode.
92 6. ->algos List of allowed algos. Plain bitmask now.
93 Q: ealgos, aalgos, calgos. What a mess...
94 7. ->share Sharing mode.
95 Q: how to implement private sharing mode? To add struct sock* to
96 flow id?
97
98 Having this template we search through SAD searching for entries
99 with appropriate mode/proto/algo, permitted by selector.
100 If no appropriate entry found, it is requested from key manager.
101
102 PROBLEMS:
103 Q: How to find all the bundles referring to a physical path for
104 PMTU discovery? Seems, dst should contain list of all parents...
105 and enter to infinite locking hierarchy disaster.
106 No! It is easier, we will not search for them, let them find us.
107 We add genid to each dst plus pointer to genid of raw IP route,
108 pmtu disc will update pmtu on raw IP route and increase its genid.
109 dst_check() will see this for top level and trigger resyncing
110 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
111 */
112
113 struct xfrm_state_walk {
114 struct list_head all;
115 u8 state;
116 union {
117 u8 dying;
118 u8 proto;
119 };
120 u32 seq;
121 };
122
123 /* Full description of state of transformer. */
124 struct xfrm_state
125 {
126 #ifdef CONFIG_NET_NS
127 struct net *xs_net;
128 #endif
129 union {
130 struct hlist_node gclist;
131 struct hlist_node bydst;
132 };
133 struct hlist_node bysrc;
134 struct hlist_node byspi;
135
136 atomic_t refcnt;
137 spinlock_t lock;
138
139 struct xfrm_id id;
140 struct xfrm_selector sel;
141
142 u32 genid;
143
144 /* Key manager bits */
145 struct xfrm_state_walk km;
146
147 /* Parameters of this state. */
148 struct {
149 u32 reqid;
150 u8 mode;
151 u8 replay_window;
152 u8 aalgo, ealgo, calgo;
153 u8 flags;
154 u16 family;
155 xfrm_address_t saddr;
156 int header_len;
157 int trailer_len;
158 } props;
159
160 struct xfrm_lifetime_cfg lft;
161
162 /* Data for transformer */
163 struct xfrm_algo *aalg;
164 struct xfrm_algo *ealg;
165 struct xfrm_algo *calg;
166 struct xfrm_algo_aead *aead;
167
168 /* Data for encapsulator */
169 struct xfrm_encap_tmpl *encap;
170
171 /* Data for care-of address */
172 xfrm_address_t *coaddr;
173
174 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
175 struct xfrm_state *tunnel;
176
177 /* If a tunnel, number of users + 1 */
178 atomic_t tunnel_users;
179
180 /* State for replay detection */
181 struct xfrm_replay_state replay;
182
183 /* Replay detection state at the time we sent the last notification */
184 struct xfrm_replay_state preplay;
185
186 /* internal flag that only holds state for delayed aevent at the
187 * moment
188 */
189 u32 xflags;
190
191 /* Replay detection notification settings */
192 u32 replay_maxage;
193 u32 replay_maxdiff;
194
195 /* Replay detection notification timer */
196 struct timer_list rtimer;
197
198 /* Statistics */
199 struct xfrm_stats stats;
200
201 struct xfrm_lifetime_cur curlft;
202 struct timer_list timer;
203
204 /* Last used time */
205 unsigned long lastused;
206
207 /* Reference to data common to all the instances of this
208 * transformer. */
209 const struct xfrm_type *type;
210 struct xfrm_mode *inner_mode;
211 struct xfrm_mode *inner_mode_iaf;
212 struct xfrm_mode *outer_mode;
213
214 /* Security context */
215 struct xfrm_sec_ctx *security;
216
217 /* Private data of this transformer, format is opaque,
218 * interpreted by xfrm_type methods. */
219 void *data;
220 };
221
222 static inline struct net *xs_net(struct xfrm_state *x)
223 {
224 return read_pnet(&x->xs_net);
225 }
226
227 /* xflags - make enum if more show up */
228 #define XFRM_TIME_DEFER 1
229
230 enum {
231 XFRM_STATE_VOID,
232 XFRM_STATE_ACQ,
233 XFRM_STATE_VALID,
234 XFRM_STATE_ERROR,
235 XFRM_STATE_EXPIRED,
236 XFRM_STATE_DEAD
237 };
238
239 /* callback structure passed from either netlink or pfkey */
240 struct km_event
241 {
242 union {
243 u32 hard;
244 u32 proto;
245 u32 byid;
246 u32 aevent;
247 u32 type;
248 } data;
249
250 u32 seq;
251 u32 pid;
252 u32 event;
253 struct net *net;
254 };
255
256 struct net_device;
257 struct xfrm_type;
258 struct xfrm_dst;
259 struct xfrm_policy_afinfo {
260 unsigned short family;
261 struct dst_ops *dst_ops;
262 void (*garbage_collect)(struct net *net);
263 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
264 xfrm_address_t *saddr,
265 xfrm_address_t *daddr);
266 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
267 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
268 void (*decode_session)(struct sk_buff *skb,
269 struct flowi *fl,
270 int reverse);
271 int (*get_tos)(struct flowi *fl);
272 int (*init_path)(struct xfrm_dst *path,
273 struct dst_entry *dst,
274 int nfheader_len);
275 int (*fill_dst)(struct xfrm_dst *xdst,
276 struct net_device *dev);
277 };
278
279 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
280 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
281 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
282 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
283
284 struct xfrm_tmpl;
285 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
286 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
287 extern int __xfrm_state_delete(struct xfrm_state *x);
288
289 struct xfrm_state_afinfo {
290 unsigned int family;
291 unsigned int proto;
292 __be16 eth_proto;
293 struct module *owner;
294 const struct xfrm_type *type_map[IPPROTO_MAX];
295 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
296 int (*init_flags)(struct xfrm_state *x);
297 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
298 struct xfrm_tmpl *tmpl,
299 xfrm_address_t *daddr, xfrm_address_t *saddr);
300 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
301 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
302 int (*output)(struct sk_buff *skb);
303 int (*extract_input)(struct xfrm_state *x,
304 struct sk_buff *skb);
305 int (*extract_output)(struct xfrm_state *x,
306 struct sk_buff *skb);
307 int (*transport_finish)(struct sk_buff *skb,
308 int async);
309 };
310
311 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
312 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
313
314 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
315
316 struct xfrm_type
317 {
318 char *description;
319 struct module *owner;
320 __u8 proto;
321 __u8 flags;
322 #define XFRM_TYPE_NON_FRAGMENT 1
323 #define XFRM_TYPE_REPLAY_PROT 2
324 #define XFRM_TYPE_LOCAL_COADDR 4
325 #define XFRM_TYPE_REMOTE_COADDR 8
326
327 int (*init_state)(struct xfrm_state *x);
328 void (*destructor)(struct xfrm_state *);
329 int (*input)(struct xfrm_state *, struct sk_buff *skb);
330 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
331 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
332 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
333 /* Estimate maximal size of result of transformation of a dgram */
334 u32 (*get_mtu)(struct xfrm_state *, int size);
335 };
336
337 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
338 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
339
340 struct xfrm_mode {
341 /*
342 * Remove encapsulation header.
343 *
344 * The IP header will be moved over the top of the encapsulation
345 * header.
346 *
347 * On entry, the transport header shall point to where the IP header
348 * should be and the network header shall be set to where the IP
349 * header currently is. skb->data shall point to the start of the
350 * payload.
351 */
352 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
353
354 /*
355 * This is the actual input entry point.
356 *
357 * For transport mode and equivalent this would be identical to
358 * input2 (which does not need to be set). While tunnel mode
359 * and equivalent would set this to the tunnel encapsulation function
360 * xfrm4_prepare_input that would in turn call input2.
361 */
362 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
363
364 /*
365 * Add encapsulation header.
366 *
367 * On exit, the transport header will be set to the start of the
368 * encapsulation header to be filled in by x->type->output and
369 * the mac header will be set to the nextheader (protocol for
370 * IPv4) field of the extension header directly preceding the
371 * encapsulation header, or in its absence, that of the top IP
372 * header. The value of the network header will always point
373 * to the top IP header while skb->data will point to the payload.
374 */
375 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
376
377 /*
378 * This is the actual output entry point.
379 *
380 * For transport mode and equivalent this would be identical to
381 * output2 (which does not need to be set). While tunnel mode
382 * and equivalent would set this to a tunnel encapsulation function
383 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
384 * call output2.
385 */
386 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
387
388 struct xfrm_state_afinfo *afinfo;
389 struct module *owner;
390 unsigned int encap;
391 int flags;
392 };
393
394 /* Flags for xfrm_mode. */
395 enum {
396 XFRM_MODE_FLAG_TUNNEL = 1,
397 };
398
399 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
400 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
401
402 static inline int xfrm_af2proto(unsigned int family)
403 {
404 switch(family) {
405 case AF_INET:
406 return IPPROTO_IPIP;
407 case AF_INET6:
408 return IPPROTO_IPV6;
409 default:
410 return 0;
411 }
412 }
413
414 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
415 {
416 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
417 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
418 return x->inner_mode;
419 else
420 return x->inner_mode_iaf;
421 }
422
423 struct xfrm_tmpl
424 {
425 /* id in template is interpreted as:
426 * daddr - destination of tunnel, may be zero for transport mode.
427 * spi - zero to acquire spi. Not zero if spi is static, then
428 * daddr must be fixed too.
429 * proto - AH/ESP/IPCOMP
430 */
431 struct xfrm_id id;
432
433 /* Source address of tunnel. Ignored, if it is not a tunnel. */
434 xfrm_address_t saddr;
435
436 unsigned short encap_family;
437
438 __u32 reqid;
439
440 /* Mode: transport, tunnel etc. */
441 __u8 mode;
442
443 /* Sharing mode: unique, this session only, this user only etc. */
444 __u8 share;
445
446 /* May skip this transfomration if no SA is found */
447 __u8 optional;
448
449 /* Skip aalgos/ealgos/calgos checks. */
450 __u8 allalgs;
451
452 /* Bit mask of algos allowed for acquisition */
453 __u32 aalgos;
454 __u32 ealgos;
455 __u32 calgos;
456 };
457
458 #define XFRM_MAX_DEPTH 6
459
460 struct xfrm_policy_walk_entry {
461 struct list_head all;
462 u8 dead;
463 };
464
465 struct xfrm_policy_walk {
466 struct xfrm_policy_walk_entry walk;
467 u8 type;
468 u32 seq;
469 };
470
471 struct xfrm_policy
472 {
473 #ifdef CONFIG_NET_NS
474 struct net *xp_net;
475 #endif
476 struct hlist_node bydst;
477 struct hlist_node byidx;
478
479 /* This lock only affects elements except for entry. */
480 rwlock_t lock;
481 atomic_t refcnt;
482 struct timer_list timer;
483
484 u32 priority;
485 u32 index;
486 struct xfrm_selector selector;
487 struct xfrm_lifetime_cfg lft;
488 struct xfrm_lifetime_cur curlft;
489 struct dst_entry *bundles;
490 struct xfrm_policy_walk_entry walk;
491 u8 type;
492 u8 action;
493 u8 flags;
494 u8 xfrm_nr;
495 u16 family;
496 struct xfrm_sec_ctx *security;
497 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
498 };
499
500 static inline struct net *xp_net(struct xfrm_policy *xp)
501 {
502 return read_pnet(&xp->xp_net);
503 }
504
505 struct xfrm_kmaddress {
506 xfrm_address_t local;
507 xfrm_address_t remote;
508 u32 reserved;
509 u16 family;
510 };
511
512 struct xfrm_migrate {
513 xfrm_address_t old_daddr;
514 xfrm_address_t old_saddr;
515 xfrm_address_t new_daddr;
516 xfrm_address_t new_saddr;
517 u8 proto;
518 u8 mode;
519 u16 reserved;
520 u32 reqid;
521 u16 old_family;
522 u16 new_family;
523 };
524
525 #define XFRM_KM_TIMEOUT 30
526 /* which seqno */
527 #define XFRM_REPLAY_SEQ 1
528 #define XFRM_REPLAY_OSEQ 2
529 #define XFRM_REPLAY_SEQ_MASK 3
530 /* what happened */
531 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
532 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
533
534 /* default aevent timeout in units of 100ms */
535 #define XFRM_AE_ETIME 10
536 /* Async Event timer multiplier */
537 #define XFRM_AE_ETH_M 10
538 /* default seq threshold size */
539 #define XFRM_AE_SEQT_SIZE 2
540
541 struct xfrm_mgr
542 {
543 struct list_head list;
544 char *id;
545 int (*notify)(struct xfrm_state *x, struct km_event *c);
546 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
547 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
548 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
549 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
550 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
551 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
552 };
553
554 extern int xfrm_register_km(struct xfrm_mgr *km);
555 extern int xfrm_unregister_km(struct xfrm_mgr *km);
556
557 /*
558 * This structure is used for the duration where packets are being
559 * transformed by IPsec. As soon as the packet leaves IPsec the
560 * area beyond the generic IP part may be overwritten.
561 */
562 struct xfrm_skb_cb {
563 union {
564 struct inet_skb_parm h4;
565 struct inet6_skb_parm h6;
566 } header;
567
568 /* Sequence number for replay protection. */
569 union {
570 u64 output;
571 __be32 input;
572 } seq;
573 };
574
575 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
576
577 /*
578 * This structure is used by the afinfo prepare_input/prepare_output functions
579 * to transmit header information to the mode input/output functions.
580 */
581 struct xfrm_mode_skb_cb {
582 union {
583 struct inet_skb_parm h4;
584 struct inet6_skb_parm h6;
585 } header;
586
587 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
588 __be16 id;
589 __be16 frag_off;
590
591 /* IP header length (excluding options or extension headers). */
592 u8 ihl;
593
594 /* TOS for IPv4, class for IPv6. */
595 u8 tos;
596
597 /* TTL for IPv4, hop limitfor IPv6. */
598 u8 ttl;
599
600 /* Protocol for IPv4, NH for IPv6. */
601 u8 protocol;
602
603 /* Option length for IPv4, zero for IPv6. */
604 u8 optlen;
605
606 /* Used by IPv6 only, zero for IPv4. */
607 u8 flow_lbl[3];
608 };
609
610 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
611
612 /*
613 * This structure is used by the input processing to locate the SPI and
614 * related information.
615 */
616 struct xfrm_spi_skb_cb {
617 union {
618 struct inet_skb_parm h4;
619 struct inet6_skb_parm h6;
620 } header;
621
622 unsigned int daddroff;
623 unsigned int family;
624 };
625
626 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
627
628 /* Audit Information */
629 struct xfrm_audit
630 {
631 u32 secid;
632 uid_t loginuid;
633 u32 sessionid;
634 };
635
636 #ifdef CONFIG_AUDITSYSCALL
637 static inline struct audit_buffer *xfrm_audit_start(const char *op)
638 {
639 struct audit_buffer *audit_buf = NULL;
640
641 if (audit_enabled == 0)
642 return NULL;
643 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
644 AUDIT_MAC_IPSEC_EVENT);
645 if (audit_buf == NULL)
646 return NULL;
647 audit_log_format(audit_buf, "op=%s", op);
648 return audit_buf;
649 }
650
651 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
652 struct audit_buffer *audit_buf)
653 {
654 char *secctx;
655 u32 secctx_len;
656
657 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
658 if (secid != 0 &&
659 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
660 audit_log_format(audit_buf, " subj=%s", secctx);
661 security_release_secctx(secctx, secctx_len);
662 } else
663 audit_log_task_context(audit_buf);
664 }
665
666 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
667 u32 auid, u32 ses, u32 secid);
668 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
669 u32 auid, u32 ses, u32 secid);
670 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
671 u32 auid, u32 ses, u32 secid);
672 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
673 u32 auid, u32 ses, u32 secid);
674 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
675 struct sk_buff *skb);
676 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
677 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
678 __be32 net_spi, __be32 net_seq);
679 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
680 struct sk_buff *skb, u8 proto);
681 #else
682
683 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
684 u32 auid, u32 ses, u32 secid)
685 {
686 }
687
688 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
689 u32 auid, u32 ses, u32 secid)
690 {
691 }
692
693 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
694 u32 auid, u32 ses, u32 secid)
695 {
696 }
697
698 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
699 u32 auid, u32 ses, u32 secid)
700 {
701 }
702
703 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
704 struct sk_buff *skb)
705 {
706 }
707
708 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
709 u16 family)
710 {
711 }
712
713 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
714 __be32 net_spi, __be32 net_seq)
715 {
716 }
717
718 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
719 struct sk_buff *skb, u8 proto)
720 {
721 }
722 #endif /* CONFIG_AUDITSYSCALL */
723
724 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
725 {
726 if (likely(policy != NULL))
727 atomic_inc(&policy->refcnt);
728 }
729
730 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
731
732 static inline void xfrm_pol_put(struct xfrm_policy *policy)
733 {
734 if (atomic_dec_and_test(&policy->refcnt))
735 xfrm_policy_destroy(policy);
736 }
737
738 #ifdef CONFIG_XFRM_SUB_POLICY
739 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
740 {
741 int i;
742 for (i = npols - 1; i >= 0; --i)
743 xfrm_pol_put(pols[i]);
744 }
745 #else
746 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
747 {
748 xfrm_pol_put(pols[0]);
749 }
750 #endif
751
752 extern void __xfrm_state_destroy(struct xfrm_state *);
753
754 static inline void __xfrm_state_put(struct xfrm_state *x)
755 {
756 atomic_dec(&x->refcnt);
757 }
758
759 static inline void xfrm_state_put(struct xfrm_state *x)
760 {
761 if (atomic_dec_and_test(&x->refcnt))
762 __xfrm_state_destroy(x);
763 }
764
765 static inline void xfrm_state_hold(struct xfrm_state *x)
766 {
767 atomic_inc(&x->refcnt);
768 }
769
770 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
771 {
772 __be32 *a1 = token1;
773 __be32 *a2 = token2;
774 int pdw;
775 int pbi;
776
777 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
778 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
779
780 if (pdw)
781 if (memcmp(a1, a2, pdw << 2))
782 return 0;
783
784 if (pbi) {
785 __be32 mask;
786
787 mask = htonl((0xffffffff) << (32 - pbi));
788
789 if ((a1[pdw] ^ a2[pdw]) & mask)
790 return 0;
791 }
792
793 return 1;
794 }
795
796 static __inline__
797 __be16 xfrm_flowi_sport(struct flowi *fl)
798 {
799 __be16 port;
800 switch(fl->proto) {
801 case IPPROTO_TCP:
802 case IPPROTO_UDP:
803 case IPPROTO_UDPLITE:
804 case IPPROTO_SCTP:
805 port = fl->fl_ip_sport;
806 break;
807 case IPPROTO_ICMP:
808 case IPPROTO_ICMPV6:
809 port = htons(fl->fl_icmp_type);
810 break;
811 case IPPROTO_MH:
812 port = htons(fl->fl_mh_type);
813 break;
814 default:
815 port = 0; /*XXX*/
816 }
817 return port;
818 }
819
820 static __inline__
821 __be16 xfrm_flowi_dport(struct flowi *fl)
822 {
823 __be16 port;
824 switch(fl->proto) {
825 case IPPROTO_TCP:
826 case IPPROTO_UDP:
827 case IPPROTO_UDPLITE:
828 case IPPROTO_SCTP:
829 port = fl->fl_ip_dport;
830 break;
831 case IPPROTO_ICMP:
832 case IPPROTO_ICMPV6:
833 port = htons(fl->fl_icmp_code);
834 break;
835 default:
836 port = 0; /*XXX*/
837 }
838 return port;
839 }
840
841 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
842 unsigned short family);
843
844 #ifdef CONFIG_SECURITY_NETWORK_XFRM
845 /* If neither has a context --> match
846 * Otherwise, both must have a context and the sids, doi, alg must match
847 */
848 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
849 {
850 return ((!s1 && !s2) ||
851 (s1 && s2 &&
852 (s1->ctx_sid == s2->ctx_sid) &&
853 (s1->ctx_doi == s2->ctx_doi) &&
854 (s1->ctx_alg == s2->ctx_alg)));
855 }
856 #else
857 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
858 {
859 return 1;
860 }
861 #endif
862
863 /* A struct encoding bundle of transformations to apply to some set of flow.
864 *
865 * dst->child points to the next element of bundle.
866 * dst->xfrm points to an instanse of transformer.
867 *
868 * Due to unfortunate limitations of current routing cache, which we
869 * have no time to fix, it mirrors struct rtable and bound to the same
870 * routing key, including saddr,daddr. However, we can have many of
871 * bundles differing by session id. All the bundles grow from a parent
872 * policy rule.
873 */
874 struct xfrm_dst
875 {
876 union {
877 struct dst_entry dst;
878 struct rtable rt;
879 struct rt6_info rt6;
880 } u;
881 struct dst_entry *route;
882 #ifdef CONFIG_XFRM_SUB_POLICY
883 struct flowi *origin;
884 struct xfrm_selector *partner;
885 #endif
886 u32 genid;
887 u32 route_mtu_cached;
888 u32 child_mtu_cached;
889 u32 route_cookie;
890 u32 path_cookie;
891 };
892
893 #ifdef CONFIG_XFRM
894 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
895 {
896 dst_release(xdst->route);
897 if (likely(xdst->u.dst.xfrm))
898 xfrm_state_put(xdst->u.dst.xfrm);
899 #ifdef CONFIG_XFRM_SUB_POLICY
900 kfree(xdst->origin);
901 xdst->origin = NULL;
902 kfree(xdst->partner);
903 xdst->partner = NULL;
904 #endif
905 }
906 #endif
907
908 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
909
910 struct sec_path
911 {
912 atomic_t refcnt;
913 int len;
914 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
915 };
916
917 static inline struct sec_path *
918 secpath_get(struct sec_path *sp)
919 {
920 if (sp)
921 atomic_inc(&sp->refcnt);
922 return sp;
923 }
924
925 extern void __secpath_destroy(struct sec_path *sp);
926
927 static inline void
928 secpath_put(struct sec_path *sp)
929 {
930 if (sp && atomic_dec_and_test(&sp->refcnt))
931 __secpath_destroy(sp);
932 }
933
934 extern struct sec_path *secpath_dup(struct sec_path *src);
935
936 static inline void
937 secpath_reset(struct sk_buff *skb)
938 {
939 #ifdef CONFIG_XFRM
940 secpath_put(skb->sp);
941 skb->sp = NULL;
942 #endif
943 }
944
945 static inline int
946 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
947 {
948 switch (family) {
949 case AF_INET:
950 return addr->a4 == 0;
951 case AF_INET6:
952 return ipv6_addr_any((struct in6_addr *)&addr->a6);
953 }
954 return 0;
955 }
956
957 static inline int
958 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
959 {
960 return (tmpl->saddr.a4 &&
961 tmpl->saddr.a4 != x->props.saddr.a4);
962 }
963
964 static inline int
965 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
966 {
967 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
968 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
969 }
970
971 static inline int
972 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
973 {
974 switch (family) {
975 case AF_INET:
976 return __xfrm4_state_addr_cmp(tmpl, x);
977 case AF_INET6:
978 return __xfrm6_state_addr_cmp(tmpl, x);
979 }
980 return !0;
981 }
982
983 #ifdef CONFIG_XFRM
984 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
985
986 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
987 struct sk_buff *skb,
988 unsigned int family, int reverse)
989 {
990 struct net *net = dev_net(skb->dev);
991 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
992
993 if (sk && sk->sk_policy[XFRM_POLICY_IN])
994 return __xfrm_policy_check(sk, ndir, skb, family);
995
996 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
997 (skb_dst(skb)->flags & DST_NOPOLICY) ||
998 __xfrm_policy_check(sk, ndir, skb, family);
999 }
1000
1001 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1002 {
1003 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1004 }
1005
1006 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1007 {
1008 return xfrm_policy_check(sk, dir, skb, AF_INET);
1009 }
1010
1011 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1012 {
1013 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1014 }
1015
1016 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1017 struct sk_buff *skb)
1018 {
1019 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1020 }
1021
1022 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1023 struct sk_buff *skb)
1024 {
1025 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1026 }
1027
1028 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1029 unsigned int family, int reverse);
1030
1031 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1032 unsigned int family)
1033 {
1034 return __xfrm_decode_session(skb, fl, family, 0);
1035 }
1036
1037 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1038 struct flowi *fl,
1039 unsigned int family)
1040 {
1041 return __xfrm_decode_session(skb, fl, family, 1);
1042 }
1043
1044 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1045
1046 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1047 {
1048 struct net *net = dev_net(skb->dev);
1049
1050 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1051 (skb_dst(skb)->flags & DST_NOXFRM) ||
1052 __xfrm_route_forward(skb, family);
1053 }
1054
1055 static inline int xfrm4_route_forward(struct sk_buff *skb)
1056 {
1057 return xfrm_route_forward(skb, AF_INET);
1058 }
1059
1060 static inline int xfrm6_route_forward(struct sk_buff *skb)
1061 {
1062 return xfrm_route_forward(skb, AF_INET6);
1063 }
1064
1065 extern int __xfrm_sk_clone_policy(struct sock *sk);
1066
1067 static inline int xfrm_sk_clone_policy(struct sock *sk)
1068 {
1069 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1070 return __xfrm_sk_clone_policy(sk);
1071 return 0;
1072 }
1073
1074 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1075
1076 static inline void xfrm_sk_free_policy(struct sock *sk)
1077 {
1078 if (unlikely(sk->sk_policy[0] != NULL)) {
1079 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1080 sk->sk_policy[0] = NULL;
1081 }
1082 if (unlikely(sk->sk_policy[1] != NULL)) {
1083 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1084 sk->sk_policy[1] = NULL;
1085 }
1086 }
1087
1088 #else
1089
1090 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1091 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1092 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1093 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1094 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1095 {
1096 return 1;
1097 }
1098 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1099 {
1100 return 1;
1101 }
1102 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1103 {
1104 return 1;
1105 }
1106 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1107 struct flowi *fl,
1108 unsigned int family)
1109 {
1110 return -ENOSYS;
1111 }
1112 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1113 struct sk_buff *skb)
1114 {
1115 return 1;
1116 }
1117 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1118 struct sk_buff *skb)
1119 {
1120 return 1;
1121 }
1122 #endif
1123
1124 static __inline__
1125 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1126 {
1127 switch (family){
1128 case AF_INET:
1129 return (xfrm_address_t *)&fl->fl4_dst;
1130 case AF_INET6:
1131 return (xfrm_address_t *)&fl->fl6_dst;
1132 }
1133 return NULL;
1134 }
1135
1136 static __inline__
1137 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1138 {
1139 switch (family){
1140 case AF_INET:
1141 return (xfrm_address_t *)&fl->fl4_src;
1142 case AF_INET6:
1143 return (xfrm_address_t *)&fl->fl6_src;
1144 }
1145 return NULL;
1146 }
1147
1148 static __inline__
1149 void xfrm_flowi_addr_get(struct flowi *fl,
1150 xfrm_address_t *saddr, xfrm_address_t *daddr,
1151 unsigned short family)
1152 {
1153 switch(family) {
1154 case AF_INET:
1155 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1156 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1157 break;
1158 case AF_INET6:
1159 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1160 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1161 break;
1162 }
1163 }
1164
1165 static __inline__ int
1166 __xfrm4_state_addr_check(struct xfrm_state *x,
1167 xfrm_address_t *daddr, xfrm_address_t *saddr)
1168 {
1169 if (daddr->a4 == x->id.daddr.a4 &&
1170 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1171 return 1;
1172 return 0;
1173 }
1174
1175 static __inline__ int
1176 __xfrm6_state_addr_check(struct xfrm_state *x,
1177 xfrm_address_t *daddr, xfrm_address_t *saddr)
1178 {
1179 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1180 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1181 ipv6_addr_any((struct in6_addr *)saddr) ||
1182 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1183 return 1;
1184 return 0;
1185 }
1186
1187 static __inline__ int
1188 xfrm_state_addr_check(struct xfrm_state *x,
1189 xfrm_address_t *daddr, xfrm_address_t *saddr,
1190 unsigned short family)
1191 {
1192 switch (family) {
1193 case AF_INET:
1194 return __xfrm4_state_addr_check(x, daddr, saddr);
1195 case AF_INET6:
1196 return __xfrm6_state_addr_check(x, daddr, saddr);
1197 }
1198 return 0;
1199 }
1200
1201 static __inline__ int
1202 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1203 unsigned short family)
1204 {
1205 switch (family) {
1206 case AF_INET:
1207 return __xfrm4_state_addr_check(x,
1208 (xfrm_address_t *)&fl->fl4_dst,
1209 (xfrm_address_t *)&fl->fl4_src);
1210 case AF_INET6:
1211 return __xfrm6_state_addr_check(x,
1212 (xfrm_address_t *)&fl->fl6_dst,
1213 (xfrm_address_t *)&fl->fl6_src);
1214 }
1215 return 0;
1216 }
1217
1218 static inline int xfrm_state_kern(struct xfrm_state *x)
1219 {
1220 return atomic_read(&x->tunnel_users);
1221 }
1222
1223 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1224 {
1225 return (!userproto || proto == userproto ||
1226 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1227 proto == IPPROTO_ESP ||
1228 proto == IPPROTO_COMP)));
1229 }
1230
1231 /*
1232 * xfrm algorithm information
1233 */
1234 struct xfrm_algo_aead_info {
1235 u16 icv_truncbits;
1236 };
1237
1238 struct xfrm_algo_auth_info {
1239 u16 icv_truncbits;
1240 u16 icv_fullbits;
1241 };
1242
1243 struct xfrm_algo_encr_info {
1244 u16 blockbits;
1245 u16 defkeybits;
1246 };
1247
1248 struct xfrm_algo_comp_info {
1249 u16 threshold;
1250 };
1251
1252 struct xfrm_algo_desc {
1253 char *name;
1254 char *compat;
1255 u8 available:1;
1256 union {
1257 struct xfrm_algo_aead_info aead;
1258 struct xfrm_algo_auth_info auth;
1259 struct xfrm_algo_encr_info encr;
1260 struct xfrm_algo_comp_info comp;
1261 } uinfo;
1262 struct sadb_alg desc;
1263 };
1264
1265 /* XFRM tunnel handlers. */
1266 struct xfrm_tunnel {
1267 int (*handler)(struct sk_buff *skb);
1268 int (*err_handler)(struct sk_buff *skb, __u32 info);
1269
1270 struct xfrm_tunnel *next;
1271 int priority;
1272 };
1273
1274 struct xfrm6_tunnel {
1275 int (*handler)(struct sk_buff *skb);
1276 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1277 u8 type, u8 code, int offset, __be32 info);
1278 struct xfrm6_tunnel *next;
1279 int priority;
1280 };
1281
1282 extern void xfrm_init(void);
1283 extern void xfrm4_init(void);
1284 extern int xfrm_state_init(struct net *net);
1285 extern void xfrm_state_fini(struct net *net);
1286 extern void xfrm4_state_init(void);
1287 #ifdef CONFIG_XFRM
1288 extern int xfrm6_init(void);
1289 extern void xfrm6_fini(void);
1290 extern int xfrm6_state_init(void);
1291 extern void xfrm6_state_fini(void);
1292 #else
1293 static inline int xfrm6_init(void)
1294 {
1295 return 0;
1296 }
1297 static inline void xfrm6_fini(void)
1298 {
1299 ;
1300 }
1301 #endif
1302
1303 #ifdef CONFIG_XFRM_STATISTICS
1304 extern int xfrm_proc_init(struct net *net);
1305 extern void xfrm_proc_fini(struct net *net);
1306 #endif
1307
1308 extern int xfrm_sysctl_init(struct net *net);
1309 #ifdef CONFIG_SYSCTL
1310 extern void xfrm_sysctl_fini(struct net *net);
1311 #else
1312 static inline void xfrm_sysctl_fini(struct net *net)
1313 {
1314 }
1315 #endif
1316
1317 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1318 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1319 int (*func)(struct xfrm_state *, int, void*), void *);
1320 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1321 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1322 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1323 struct flowi *fl, struct xfrm_tmpl *tmpl,
1324 struct xfrm_policy *pol, int *err,
1325 unsigned short family);
1326 extern struct xfrm_state * xfrm_stateonly_find(struct net *net,
1327 xfrm_address_t *daddr,
1328 xfrm_address_t *saddr,
1329 unsigned short family,
1330 u8 mode, u8 proto, u32 reqid);
1331 extern int xfrm_state_check_expire(struct xfrm_state *x);
1332 extern void xfrm_state_insert(struct xfrm_state *x);
1333 extern int xfrm_state_add(struct xfrm_state *x);
1334 extern int xfrm_state_update(struct xfrm_state *x);
1335 extern struct xfrm_state *xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1336 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1337 #ifdef CONFIG_XFRM_SUB_POLICY
1338 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1339 int n, unsigned short family);
1340 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1341 int n, unsigned short family);
1342 #else
1343 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1344 int n, unsigned short family)
1345 {
1346 return -ENOSYS;
1347 }
1348
1349 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1350 int n, unsigned short family)
1351 {
1352 return -ENOSYS;
1353 }
1354 #endif
1355
1356 struct xfrmk_sadinfo {
1357 u32 sadhcnt; /* current hash bkts */
1358 u32 sadhmcnt; /* max allowed hash bkts */
1359 u32 sadcnt; /* current running count */
1360 };
1361
1362 struct xfrmk_spdinfo {
1363 u32 incnt;
1364 u32 outcnt;
1365 u32 fwdcnt;
1366 u32 inscnt;
1367 u32 outscnt;
1368 u32 fwdscnt;
1369 u32 spdhcnt;
1370 u32 spdhmcnt;
1371 };
1372
1373 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq);
1374 extern int xfrm_state_delete(struct xfrm_state *x);
1375 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1376 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1377 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1378 extern int xfrm_replay_check(struct xfrm_state *x,
1379 struct sk_buff *skb, __be32 seq);
1380 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1381 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1382 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1383 extern int xfrm_init_state(struct xfrm_state *x);
1384 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1385 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1386 int encap_type);
1387 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1388 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1389 extern int xfrm_output(struct sk_buff *skb);
1390 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1391 extern int xfrm4_extract_header(struct sk_buff *skb);
1392 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1393 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1394 int encap_type);
1395 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1396 extern int xfrm4_rcv(struct sk_buff *skb);
1397
1398 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1399 {
1400 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1401 }
1402
1403 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1404 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1405 extern int xfrm4_output(struct sk_buff *skb);
1406 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1407 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1408 extern int xfrm6_extract_header(struct sk_buff *skb);
1409 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1410 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1411 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1412 extern int xfrm6_rcv(struct sk_buff *skb);
1413 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1414 xfrm_address_t *saddr, u8 proto);
1415 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1416 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1417 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1418 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1419 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1420 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1421 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1422 extern int xfrm6_output(struct sk_buff *skb);
1423 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1424 u8 **prevhdr);
1425
1426 #ifdef CONFIG_XFRM
1427 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1428 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1429 #else
1430 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1431 {
1432 return -ENOPROTOOPT;
1433 }
1434
1435 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1436 {
1437 /* should not happen */
1438 kfree_skb(skb);
1439 return 0;
1440 }
1441 #endif
1442
1443 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1444
1445 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1446 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1447 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1448 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1449 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1450 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u8 type, int dir,
1451 struct xfrm_selector *sel,
1452 struct xfrm_sec_ctx *ctx, int delete,
1453 int *err);
1454 struct xfrm_policy *xfrm_policy_byid(struct net *net, u8, int dir, u32 id, int delete, int *err);
1455 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1456 u32 xfrm_get_acqseq(void);
1457 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1458 struct xfrm_state * xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto,
1459 xfrm_address_t *daddr, xfrm_address_t *saddr,
1460 int create, unsigned short family);
1461 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1462 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1463 struct flowi *fl, int family, int strict);
1464
1465 #ifdef CONFIG_XFRM_MIGRATE
1466 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1467 struct xfrm_migrate *m, int num_bundles,
1468 struct xfrm_kmaddress *k);
1469 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1470 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1471 struct xfrm_migrate *m);
1472 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1473 struct xfrm_migrate *m, int num_bundles,
1474 struct xfrm_kmaddress *k);
1475 #endif
1476
1477 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1478 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1479 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1480
1481 extern void xfrm_input_init(void);
1482 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1483
1484 extern void xfrm_probe_algs(void);
1485 extern int xfrm_count_auth_supported(void);
1486 extern int xfrm_count_enc_supported(void);
1487 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1488 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1489 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1490 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1491 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1492 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1493 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1494 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1495 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1496 int probe);
1497
1498 struct hash_desc;
1499 struct scatterlist;
1500 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1501 unsigned int);
1502
1503 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1504 int offset, int len, icv_update_fn_t icv_update);
1505
1506 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1507 int family)
1508 {
1509 switch (family) {
1510 default:
1511 case AF_INET:
1512 return (__force __u32)a->a4 - (__force __u32)b->a4;
1513 case AF_INET6:
1514 return ipv6_addr_cmp((struct in6_addr *)a,
1515 (struct in6_addr *)b);
1516 }
1517 }
1518
1519 static inline int xfrm_policy_id2dir(u32 index)
1520 {
1521 return index & 7;
1522 }
1523
1524 #ifdef CONFIG_XFRM
1525 static inline int xfrm_aevent_is_on(struct net *net)
1526 {
1527 struct sock *nlsk;
1528 int ret = 0;
1529
1530 rcu_read_lock();
1531 nlsk = rcu_dereference(net->xfrm.nlsk);
1532 if (nlsk)
1533 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1534 rcu_read_unlock();
1535 return ret;
1536 }
1537 #endif
1538
1539 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1540 {
1541 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1542 }
1543
1544 #ifdef CONFIG_XFRM_MIGRATE
1545 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1546 {
1547 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1548 }
1549
1550 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1551 {
1552 int i;
1553 for (i = 0; i < n; i++)
1554 xfrm_state_put(*(states + i));
1555 }
1556
1557 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1558 {
1559 int i;
1560 for (i = 0; i < n; i++)
1561 xfrm_state_delete(*(states + i));
1562 }
1563 #endif
1564
1565 #ifdef CONFIG_XFRM
1566 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1567 {
1568 return skb->sp->xvec[skb->sp->len - 1];
1569 }
1570 #endif
1571
1572 #endif /* _NET_XFRM_H */
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