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Linux 2.6.36-rc5
[linux-2.6/next.git] / include / net / xfrm.h
blobfc8f36dd0f5c5145932c45aa8e9f441697dcb0ec
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 #include <linux/slab.h>
16
17 #include <net/sock.h>
18 #include <net/dst.h>
19 #include <net/ip.h>
20 #include <net/route.h>
21 #include <net/ipv6.h>
22 #include <net/ip6_fib.h>
23 #include <net/flow.h>
24
25 #include <linux/interrupt.h>
26
27 #ifdef CONFIG_XFRM_STATISTICS
28 #include <net/snmp.h>
29 #endif
30
31 #define XFRM_PROTO_ESP 50
32 #define XFRM_PROTO_AH 51
33 #define XFRM_PROTO_COMP 108
34 #define XFRM_PROTO_IPIP 4
35 #define XFRM_PROTO_IPV6 41
36 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
37 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
38
39 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
40 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
41 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
42 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
43 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
44
45 #ifdef CONFIG_XFRM_STATISTICS
46 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
47 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
48 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
49 #else
50 #define XFRM_INC_STATS(net, field) ((void)(net))
51 #define XFRM_INC_STATS_BH(net, field) ((void)(net))
52 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
53 #endif
54
55 extern struct mutex xfrm_cfg_mutex;
56
57 /* Organization of SPD aka "XFRM rules"
58 ------------------------------------
59
60 Basic objects:
61 - policy rule, struct xfrm_policy (=SPD entry)
62 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
63 - instance of a transformer, struct xfrm_state (=SA)
64 - template to clone xfrm_state, struct xfrm_tmpl
65
66 SPD is plain linear list of xfrm_policy rules, ordered by priority.
67 (To be compatible with existing pfkeyv2 implementations,
68 many rules with priority of 0x7fffffff are allowed to exist and
69 such rules are ordered in an unpredictable way, thanks to bsd folks.)
70
71 Lookup is plain linear search until the first match with selector.
72
73 If "action" is "block", then we prohibit the flow, otherwise:
74 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
75 policy entry has list of up to XFRM_MAX_DEPTH transformations,
76 described by templates xfrm_tmpl. Each template is resolved
77 to a complete xfrm_state (see below) and we pack bundle of transformations
78 to a dst_entry returned to requestor.
79
80 dst -. xfrm .-> xfrm_state #1
81 |---. child .-> dst -. xfrm .-> xfrm_state #2
82 |---. child .-> dst -. xfrm .-> xfrm_state #3
83 |---. child .-> NULL
84
85 Bundles are cached at xrfm_policy struct (field ->bundles).
86
87
88 Resolution of xrfm_tmpl
89 -----------------------
90 Template contains:
91 1. ->mode Mode: transport or tunnel
92 2. ->id.proto Protocol: AH/ESP/IPCOMP
93 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
94 Q: allow to resolve security gateway?
95 4. ->id.spi If not zero, static SPI.
96 5. ->saddr Local tunnel endpoint, ignored for transport mode.
97 6. ->algos List of allowed algos. Plain bitmask now.
98 Q: ealgos, aalgos, calgos. What a mess...
99 7. ->share Sharing mode.
100 Q: how to implement private sharing mode? To add struct sock* to
101 flow id?
102
103 Having this template we search through SAD searching for entries
104 with appropriate mode/proto/algo, permitted by selector.
105 If no appropriate entry found, it is requested from key manager.
106
107 PROBLEMS:
108 Q: How to find all the bundles referring to a physical path for
109 PMTU discovery? Seems, dst should contain list of all parents...
110 and enter to infinite locking hierarchy disaster.
111 No! It is easier, we will not search for them, let them find us.
112 We add genid to each dst plus pointer to genid of raw IP route,
113 pmtu disc will update pmtu on raw IP route and increase its genid.
114 dst_check() will see this for top level and trigger resyncing
115 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
116 */
117
118 struct xfrm_state_walk {
119 struct list_head all;
120 u8 state;
121 union {
122 u8 dying;
123 u8 proto;
124 };
125 u32 seq;
126 };
127
128 /* Full description of state of transformer. */
129 struct xfrm_state {
130 #ifdef CONFIG_NET_NS
131 struct net *xs_net;
132 #endif
133 union {
134 struct hlist_node gclist;
135 struct hlist_node bydst;
136 };
137 struct hlist_node bysrc;
138 struct hlist_node byspi;
139
140 atomic_t refcnt;
141 spinlock_t lock;
142
143 struct xfrm_id id;
144 struct xfrm_selector sel;
145 struct xfrm_mark mark;
146
147 u32 genid;
148
149 /* Key manager bits */
150 struct xfrm_state_walk km;
151
152 /* Parameters of this state. */
153 struct {
154 u32 reqid;
155 u8 mode;
156 u8 replay_window;
157 u8 aalgo, ealgo, calgo;
158 u8 flags;
159 u16 family;
160 xfrm_address_t saddr;
161 int header_len;
162 int trailer_len;
163 } props;
164
165 struct xfrm_lifetime_cfg lft;
166
167 /* Data for transformer */
168 struct xfrm_algo_auth *aalg;
169 struct xfrm_algo *ealg;
170 struct xfrm_algo *calg;
171 struct xfrm_algo_aead *aead;
172
173 /* Data for encapsulator */
174 struct xfrm_encap_tmpl *encap;
175
176 /* Data for care-of address */
177 xfrm_address_t *coaddr;
178
179 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
180 struct xfrm_state *tunnel;
181
182 /* If a tunnel, number of users + 1 */
183 atomic_t tunnel_users;
184
185 /* State for replay detection */
186 struct xfrm_replay_state replay;
187
188 /* Replay detection state at the time we sent the last notification */
189 struct xfrm_replay_state preplay;
190
191 /* internal flag that only holds state for delayed aevent at the
192 * moment
193 */
194 u32 xflags;
195
196 /* Replay detection notification settings */
197 u32 replay_maxage;
198 u32 replay_maxdiff;
199
200 /* Replay detection notification timer */
201 struct timer_list rtimer;
202
203 /* Statistics */
204 struct xfrm_stats stats;
205
206 struct xfrm_lifetime_cur curlft;
207 struct tasklet_hrtimer mtimer;
208
209 /* Last used time */
210 unsigned long lastused;
211
212 /* Reference to data common to all the instances of this
213 * transformer. */
214 const struct xfrm_type *type;
215 struct xfrm_mode *inner_mode;
216 struct xfrm_mode *inner_mode_iaf;
217 struct xfrm_mode *outer_mode;
218
219 /* Security context */
220 struct xfrm_sec_ctx *security;
221
222 /* Private data of this transformer, format is opaque,
223 * interpreted by xfrm_type methods. */
224 void *data;
225 };
226
227 static inline struct net *xs_net(struct xfrm_state *x)
228 {
229 return read_pnet(&x->xs_net);
230 }
231
232 /* xflags - make enum if more show up */
233 #define XFRM_TIME_DEFER 1
234
235 enum {
236 XFRM_STATE_VOID,
237 XFRM_STATE_ACQ,
238 XFRM_STATE_VALID,
239 XFRM_STATE_ERROR,
240 XFRM_STATE_EXPIRED,
241 XFRM_STATE_DEAD
242 };
243
244 /* callback structure passed from either netlink or pfkey */
245 struct km_event {
246 union {
247 u32 hard;
248 u32 proto;
249 u32 byid;
250 u32 aevent;
251 u32 type;
252 } data;
253
254 u32 seq;
255 u32 pid;
256 u32 event;
257 struct net *net;
258 };
259
260 struct net_device;
261 struct xfrm_type;
262 struct xfrm_dst;
263 struct xfrm_policy_afinfo {
264 unsigned short family;
265 struct dst_ops *dst_ops;
266 void (*garbage_collect)(struct net *net);
267 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
268 xfrm_address_t *saddr,
269 xfrm_address_t *daddr);
270 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
271 void (*decode_session)(struct sk_buff *skb,
272 struct flowi *fl,
273 int reverse);
274 int (*get_tos)(struct flowi *fl);
275 int (*init_path)(struct xfrm_dst *path,
276 struct dst_entry *dst,
277 int nfheader_len);
278 int (*fill_dst)(struct xfrm_dst *xdst,
279 struct net_device *dev,
280 struct flowi *fl);
281 };
282
283 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
284 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
285 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
286 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
287
288 struct xfrm_tmpl;
289 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
290 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
291 extern int __xfrm_state_delete(struct xfrm_state *x);
292
293 struct xfrm_state_afinfo {
294 unsigned int family;
295 unsigned int proto;
296 __be16 eth_proto;
297 struct module *owner;
298 const struct xfrm_type *type_map[IPPROTO_MAX];
299 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
300 int (*init_flags)(struct xfrm_state *x);
301 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
302 struct xfrm_tmpl *tmpl,
303 xfrm_address_t *daddr, xfrm_address_t *saddr);
304 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
305 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
306 int (*output)(struct sk_buff *skb);
307 int (*extract_input)(struct xfrm_state *x,
308 struct sk_buff *skb);
309 int (*extract_output)(struct xfrm_state *x,
310 struct sk_buff *skb);
311 int (*transport_finish)(struct sk_buff *skb,
312 int async);
313 };
314
315 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
316 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
317
318 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
319
320 struct xfrm_type {
321 char *description;
322 struct module *owner;
323 u8 proto;
324 u8 flags;
325 #define XFRM_TYPE_NON_FRAGMENT 1
326 #define XFRM_TYPE_REPLAY_PROT 2
327 #define XFRM_TYPE_LOCAL_COADDR 4
328 #define XFRM_TYPE_REMOTE_COADDR 8
329
330 int (*init_state)(struct xfrm_state *x);
331 void (*destructor)(struct xfrm_state *);
332 int (*input)(struct xfrm_state *, struct sk_buff *skb);
333 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
334 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
335 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
336 /* Estimate maximal size of result of transformation of a dgram */
337 u32 (*get_mtu)(struct xfrm_state *, int size);
338 };
339
340 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
341 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
342
343 struct xfrm_mode {
344 /*
345 * Remove encapsulation header.
346 *
347 * The IP header will be moved over the top of the encapsulation
348 * header.
349 *
350 * On entry, the transport header shall point to where the IP header
351 * should be and the network header shall be set to where the IP
352 * header currently is. skb->data shall point to the start of the
353 * payload.
354 */
355 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
356
357 /*
358 * This is the actual input entry point.
359 *
360 * For transport mode and equivalent this would be identical to
361 * input2 (which does not need to be set). While tunnel mode
362 * and equivalent would set this to the tunnel encapsulation function
363 * xfrm4_prepare_input that would in turn call input2.
364 */
365 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
366
367 /*
368 * Add encapsulation header.
369 *
370 * On exit, the transport header will be set to the start of the
371 * encapsulation header to be filled in by x->type->output and
372 * the mac header will be set to the nextheader (protocol for
373 * IPv4) field of the extension header directly preceding the
374 * encapsulation header, or in its absence, that of the top IP
375 * header. The value of the network header will always point
376 * to the top IP header while skb->data will point to the payload.
377 */
378 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
379
380 /*
381 * This is the actual output entry point.
382 *
383 * For transport mode and equivalent this would be identical to
384 * output2 (which does not need to be set). While tunnel mode
385 * and equivalent would set this to a tunnel encapsulation function
386 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
387 * call output2.
388 */
389 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
390
391 struct xfrm_state_afinfo *afinfo;
392 struct module *owner;
393 unsigned int encap;
394 int flags;
395 };
396
397 /* Flags for xfrm_mode. */
398 enum {
399 XFRM_MODE_FLAG_TUNNEL = 1,
400 };
401
402 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
403 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
404
405 static inline int xfrm_af2proto(unsigned int family)
406 {
407 switch(family) {
408 case AF_INET:
409 return IPPROTO_IPIP;
410 case AF_INET6:
411 return IPPROTO_IPV6;
412 default:
413 return 0;
414 }
415 }
416
417 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
418 {
419 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
420 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
421 return x->inner_mode;
422 else
423 return x->inner_mode_iaf;
424 }
425
426 struct xfrm_tmpl {
427 /* id in template is interpreted as:
428 * daddr - destination of tunnel, may be zero for transport mode.
429 * spi - zero to acquire spi. Not zero if spi is static, then
430 * daddr must be fixed too.
431 * proto - AH/ESP/IPCOMP
432 */
433 struct xfrm_id id;
434
435 /* Source address of tunnel. Ignored, if it is not a tunnel. */
436 xfrm_address_t saddr;
437
438 unsigned short encap_family;
439
440 u32 reqid;
441
442 /* Mode: transport, tunnel etc. */
443 u8 mode;
444
445 /* Sharing mode: unique, this session only, this user only etc. */
446 u8 share;
447
448 /* May skip this transfomration if no SA is found */
449 u8 optional;
450
451 /* Skip aalgos/ealgos/calgos checks. */
452 u8 allalgs;
453
454 /* Bit mask of algos allowed for acquisition */
455 u32 aalgos;
456 u32 ealgos;
457 u32 calgos;
458 };
459
460 #define XFRM_MAX_DEPTH 6
461
462 struct xfrm_policy_walk_entry {
463 struct list_head all;
464 u8 dead;
465 };
466
467 struct xfrm_policy_walk {
468 struct xfrm_policy_walk_entry walk;
469 u8 type;
470 u32 seq;
471 };
472
473 struct xfrm_policy {
474 #ifdef CONFIG_NET_NS
475 struct net *xp_net;
476 #endif
477 struct hlist_node bydst;
478 struct hlist_node byidx;
479
480 /* This lock only affects elements except for entry. */
481 rwlock_t lock;
482 atomic_t refcnt;
483 struct timer_list timer;
484
485 struct flow_cache_object flo;
486 atomic_t genid;
487 u32 priority;
488 u32 index;
489 struct xfrm_mark mark;
490 struct xfrm_selector selector;
491 struct xfrm_lifetime_cfg lft;
492 struct xfrm_lifetime_cur curlft;
493 struct xfrm_policy_walk_entry walk;
494 u8 type;
495 u8 action;
496 u8 flags;
497 u8 xfrm_nr;
498 u16 family;
499 struct xfrm_sec_ctx *security;
500 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
501 };
502
503 static inline struct net *xp_net(struct xfrm_policy *xp)
504 {
505 return read_pnet(&xp->xp_net);
506 }
507
508 struct xfrm_kmaddress {
509 xfrm_address_t local;
510 xfrm_address_t remote;
511 u32 reserved;
512 u16 family;
513 };
514
515 struct xfrm_migrate {
516 xfrm_address_t old_daddr;
517 xfrm_address_t old_saddr;
518 xfrm_address_t new_daddr;
519 xfrm_address_t new_saddr;
520 u8 proto;
521 u8 mode;
522 u16 reserved;
523 u32 reqid;
524 u16 old_family;
525 u16 new_family;
526 };
527
528 #define XFRM_KM_TIMEOUT 30
529 /* which seqno */
530 #define XFRM_REPLAY_SEQ 1
531 #define XFRM_REPLAY_OSEQ 2
532 #define XFRM_REPLAY_SEQ_MASK 3
533 /* what happened */
534 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
535 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
536
537 /* default aevent timeout in units of 100ms */
538 #define XFRM_AE_ETIME 10
539 /* Async Event timer multiplier */
540 #define XFRM_AE_ETH_M 10
541 /* default seq threshold size */
542 #define XFRM_AE_SEQT_SIZE 2
543
544 struct xfrm_mgr {
545 struct list_head list;
546 char *id;
547 int (*notify)(struct xfrm_state *x, struct km_event *c);
548 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
549 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
550 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
551 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
552 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
553 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
554 };
555
556 extern int xfrm_register_km(struct xfrm_mgr *km);
557 extern int xfrm_unregister_km(struct xfrm_mgr *km);
558
559 /*
560 * This structure is used for the duration where packets are being
561 * transformed by IPsec. As soon as the packet leaves IPsec the
562 * area beyond the generic IP part may be overwritten.
563 */
564 struct xfrm_skb_cb {
565 union {
566 struct inet_skb_parm h4;
567 struct inet6_skb_parm h6;
568 } header;
569
570 /* Sequence number for replay protection. */
571 union {
572 u64 output;
573 __be32 input;
574 } seq;
575 };
576
577 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
578
579 /*
580 * This structure is used by the afinfo prepare_input/prepare_output functions
581 * to transmit header information to the mode input/output functions.
582 */
583 struct xfrm_mode_skb_cb {
584 union {
585 struct inet_skb_parm h4;
586 struct inet6_skb_parm h6;
587 } header;
588
589 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
590 __be16 id;
591 __be16 frag_off;
592
593 /* IP header length (excluding options or extension headers). */
594 u8 ihl;
595
596 /* TOS for IPv4, class for IPv6. */
597 u8 tos;
598
599 /* TTL for IPv4, hop limitfor IPv6. */
600 u8 ttl;
601
602 /* Protocol for IPv4, NH for IPv6. */
603 u8 protocol;
604
605 /* Option length for IPv4, zero for IPv6. */
606 u8 optlen;
607
608 /* Used by IPv6 only, zero for IPv4. */
609 u8 flow_lbl[3];
610 };
611
612 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
613
614 /*
615 * This structure is used by the input processing to locate the SPI and
616 * related information.
617 */
618 struct xfrm_spi_skb_cb {
619 union {
620 struct inet_skb_parm h4;
621 struct inet6_skb_parm h6;
622 } header;
623
624 unsigned int daddroff;
625 unsigned int family;
626 };
627
628 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
629
630 /* Audit Information */
631 struct xfrm_audit {
632 u32 secid;
633 uid_t loginuid;
634 u32 sessionid;
635 };
636
637 #ifdef CONFIG_AUDITSYSCALL
638 static inline struct audit_buffer *xfrm_audit_start(const char *op)
639 {
640 struct audit_buffer *audit_buf = NULL;
641
642 if (audit_enabled == 0)
643 return NULL;
644 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
645 AUDIT_MAC_IPSEC_EVENT);
646 if (audit_buf == NULL)
647 return NULL;
648 audit_log_format(audit_buf, "op=%s", op);
649 return audit_buf;
650 }
651
652 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
653 struct audit_buffer *audit_buf)
654 {
655 char *secctx;
656 u32 secctx_len;
657
658 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
659 if (secid != 0 &&
660 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
661 audit_log_format(audit_buf, " subj=%s", secctx);
662 security_release_secctx(secctx, secctx_len);
663 } else
664 audit_log_task_context(audit_buf);
665 }
666
667 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
668 u32 auid, u32 ses, u32 secid);
669 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
670 u32 auid, u32 ses, u32 secid);
671 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
672 u32 auid, u32 ses, u32 secid);
673 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
674 u32 auid, u32 ses, u32 secid);
675 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
676 struct sk_buff *skb);
677 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
678 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
679 __be32 net_spi, __be32 net_seq);
680 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
681 struct sk_buff *skb, u8 proto);
682 #else
683
684 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
685 u32 auid, u32 ses, u32 secid)
686 {
687 }
688
689 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
690 u32 auid, u32 ses, u32 secid)
691 {
692 }
693
694 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
695 u32 auid, u32 ses, u32 secid)
696 {
697 }
698
699 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
700 u32 auid, u32 ses, u32 secid)
701 {
702 }
703
704 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
705 struct sk_buff *skb)
706 {
707 }
708
709 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
710 u16 family)
711 {
712 }
713
714 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
715 __be32 net_spi, __be32 net_seq)
716 {
717 }
718
719 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
720 struct sk_buff *skb, u8 proto)
721 {
722 }
723 #endif /* CONFIG_AUDITSYSCALL */
724
725 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
726 {
727 if (likely(policy != NULL))
728 atomic_inc(&policy->refcnt);
729 }
730
731 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
732
733 static inline void xfrm_pol_put(struct xfrm_policy *policy)
734 {
735 if (atomic_dec_and_test(&policy->refcnt))
736 xfrm_policy_destroy(policy);
737 }
738
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
746 extern void __xfrm_state_destroy(struct xfrm_state *);
747
748 static inline void __xfrm_state_put(struct xfrm_state *x)
749 {
750 atomic_dec(&x->refcnt);
751 }
752
753 static inline void xfrm_state_put(struct xfrm_state *x)
754 {
755 if (atomic_dec_and_test(&x->refcnt))
756 __xfrm_state_destroy(x);
757 }
758
759 static inline void xfrm_state_hold(struct xfrm_state *x)
760 {
761 atomic_inc(&x->refcnt);
762 }
763
764 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
765 {
766 __be32 *a1 = token1;
767 __be32 *a2 = token2;
768 int pdw;
769 int pbi;
770
771 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
772 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
773
774 if (pdw)
775 if (memcmp(a1, a2, pdw << 2))
776 return 0;
777
778 if (pbi) {
779 __be32 mask;
780
781 mask = htonl((0xffffffff) << (32 - pbi));
782
783 if ((a1[pdw] ^ a2[pdw]) & mask)
784 return 0;
785 }
786
787 return 1;
788 }
789
790 static __inline__
791 __be16 xfrm_flowi_sport(struct flowi *fl)
792 {
793 __be16 port;
794 switch(fl->proto) {
795 case IPPROTO_TCP:
796 case IPPROTO_UDP:
797 case IPPROTO_UDPLITE:
798 case IPPROTO_SCTP:
799 port = fl->fl_ip_sport;
800 break;
801 case IPPROTO_ICMP:
802 case IPPROTO_ICMPV6:
803 port = htons(fl->fl_icmp_type);
804 break;
805 case IPPROTO_MH:
806 port = htons(fl->fl_mh_type);
807 break;
808 default:
809 port = 0; /*XXX*/
810 }
811 return port;
812 }
813
814 static __inline__
815 __be16 xfrm_flowi_dport(struct flowi *fl)
816 {
817 __be16 port;
818 switch(fl->proto) {
819 case IPPROTO_TCP:
820 case IPPROTO_UDP:
821 case IPPROTO_UDPLITE:
822 case IPPROTO_SCTP:
823 port = fl->fl_ip_dport;
824 break;
825 case IPPROTO_ICMP:
826 case IPPROTO_ICMPV6:
827 port = htons(fl->fl_icmp_code);
828 break;
829 default:
830 port = 0; /*XXX*/
831 }
832 return port;
833 }
834
835 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
836 unsigned short family);
837
838 #ifdef CONFIG_SECURITY_NETWORK_XFRM
839 /* If neither has a context --> match
840 * Otherwise, both must have a context and the sids, doi, alg must match
841 */
842 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
843 {
844 return ((!s1 && !s2) ||
845 (s1 && s2 &&
846 (s1->ctx_sid == s2->ctx_sid) &&
847 (s1->ctx_doi == s2->ctx_doi) &&
848 (s1->ctx_alg == s2->ctx_alg)));
849 }
850 #else
851 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
852 {
853 return 1;
854 }
855 #endif
856
857 /* A struct encoding bundle of transformations to apply to some set of flow.
858 *
859 * dst->child points to the next element of bundle.
860 * dst->xfrm points to an instanse of transformer.
861 *
862 * Due to unfortunate limitations of current routing cache, which we
863 * have no time to fix, it mirrors struct rtable and bound to the same
864 * routing key, including saddr,daddr. However, we can have many of
865 * bundles differing by session id. All the bundles grow from a parent
866 * policy rule.
867 */
868 struct xfrm_dst {
869 union {
870 struct dst_entry dst;
871 struct rtable rt;
872 struct rt6_info rt6;
873 } u;
874 struct dst_entry *route;
875 struct flow_cache_object flo;
876 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
877 int num_pols, num_xfrms;
878 #ifdef CONFIG_XFRM_SUB_POLICY
879 struct flowi *origin;
880 struct xfrm_selector *partner;
881 #endif
882 u32 xfrm_genid;
883 u32 policy_genid;
884 u32 route_mtu_cached;
885 u32 child_mtu_cached;
886 u32 route_cookie;
887 u32 path_cookie;
888 };
889
890 #ifdef CONFIG_XFRM
891 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
892 {
893 xfrm_pols_put(xdst->pols, xdst->num_pols);
894 dst_release(xdst->route);
895 if (likely(xdst->u.dst.xfrm))
896 xfrm_state_put(xdst->u.dst.xfrm);
897 #ifdef CONFIG_XFRM_SUB_POLICY
898 kfree(xdst->origin);
899 xdst->origin = NULL;
900 kfree(xdst->partner);
901 xdst->partner = NULL;
902 #endif
903 }
904 #endif
905
906 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
907
908 struct sec_path {
909 atomic_t refcnt;
910 int len;
911 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
912 };
913
914 static inline struct sec_path *
915 secpath_get(struct sec_path *sp)
916 {
917 if (sp)
918 atomic_inc(&sp->refcnt);
919 return sp;
920 }
921
922 extern void __secpath_destroy(struct sec_path *sp);
923
924 static inline void
925 secpath_put(struct sec_path *sp)
926 {
927 if (sp && atomic_dec_and_test(&sp->refcnt))
928 __secpath_destroy(sp);
929 }
930
931 extern struct sec_path *secpath_dup(struct sec_path *src);
932
933 static inline void
934 secpath_reset(struct sk_buff *skb)
935 {
936 #ifdef CONFIG_XFRM
937 secpath_put(skb->sp);
938 skb->sp = NULL;
939 #endif
940 }
941
942 static inline int
943 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
944 {
945 switch (family) {
946 case AF_INET:
947 return addr->a4 == 0;
948 case AF_INET6:
949 return ipv6_addr_any((struct in6_addr *)&addr->a6);
950 }
951 return 0;
952 }
953
954 static inline int
955 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
956 {
957 return (tmpl->saddr.a4 &&
958 tmpl->saddr.a4 != x->props.saddr.a4);
959 }
960
961 static inline int
962 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
963 {
964 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
965 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
966 }
967
968 static inline int
969 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
970 {
971 switch (family) {
972 case AF_INET:
973 return __xfrm4_state_addr_cmp(tmpl, x);
974 case AF_INET6:
975 return __xfrm6_state_addr_cmp(tmpl, x);
976 }
977 return !0;
978 }
979
980 #ifdef CONFIG_XFRM
981 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
982
983 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
984 struct sk_buff *skb,
985 unsigned int family, int reverse)
986 {
987 struct net *net = dev_net(skb->dev);
988 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
989
990 if (sk && sk->sk_policy[XFRM_POLICY_IN])
991 return __xfrm_policy_check(sk, ndir, skb, family);
992
993 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
994 (skb_dst(skb)->flags & DST_NOPOLICY) ||
995 __xfrm_policy_check(sk, ndir, skb, family);
996 }
997
998 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
999 {
1000 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1001 }
1002
1003 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1004 {
1005 return xfrm_policy_check(sk, dir, skb, AF_INET);
1006 }
1007
1008 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1009 {
1010 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1011 }
1012
1013 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1014 struct sk_buff *skb)
1015 {
1016 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1017 }
1018
1019 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1020 struct sk_buff *skb)
1021 {
1022 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1023 }
1024
1025 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1026 unsigned int family, int reverse);
1027
1028 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1029 unsigned int family)
1030 {
1031 return __xfrm_decode_session(skb, fl, family, 0);
1032 }
1033
1034 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1035 struct flowi *fl,
1036 unsigned int family)
1037 {
1038 return __xfrm_decode_session(skb, fl, family, 1);
1039 }
1040
1041 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1042
1043 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1044 {
1045 struct net *net = dev_net(skb->dev);
1046
1047 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1048 (skb_dst(skb)->flags & DST_NOXFRM) ||
1049 __xfrm_route_forward(skb, family);
1050 }
1051
1052 static inline int xfrm4_route_forward(struct sk_buff *skb)
1053 {
1054 return xfrm_route_forward(skb, AF_INET);
1055 }
1056
1057 static inline int xfrm6_route_forward(struct sk_buff *skb)
1058 {
1059 return xfrm_route_forward(skb, AF_INET6);
1060 }
1061
1062 extern int __xfrm_sk_clone_policy(struct sock *sk);
1063
1064 static inline int xfrm_sk_clone_policy(struct sock *sk)
1065 {
1066 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1067 return __xfrm_sk_clone_policy(sk);
1068 return 0;
1069 }
1070
1071 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1072
1073 static inline void xfrm_sk_free_policy(struct sock *sk)
1074 {
1075 if (unlikely(sk->sk_policy[0] != NULL)) {
1076 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1077 sk->sk_policy[0] = NULL;
1078 }
1079 if (unlikely(sk->sk_policy[1] != NULL)) {
1080 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1081 sk->sk_policy[1] = NULL;
1082 }
1083 }
1084
1085 #else
1086
1087 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1088 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1089 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1090 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1091 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1092 {
1093 return 1;
1094 }
1095 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1096 {
1097 return 1;
1098 }
1099 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1100 {
1101 return 1;
1102 }
1103 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1104 struct flowi *fl,
1105 unsigned int family)
1106 {
1107 return -ENOSYS;
1108 }
1109 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1110 struct sk_buff *skb)
1111 {
1112 return 1;
1113 }
1114 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1115 struct sk_buff *skb)
1116 {
1117 return 1;
1118 }
1119 #endif
1120
1121 static __inline__
1122 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1123 {
1124 switch (family){
1125 case AF_INET:
1126 return (xfrm_address_t *)&fl->fl4_dst;
1127 case AF_INET6:
1128 return (xfrm_address_t *)&fl->fl6_dst;
1129 }
1130 return NULL;
1131 }
1132
1133 static __inline__
1134 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1135 {
1136 switch (family){
1137 case AF_INET:
1138 return (xfrm_address_t *)&fl->fl4_src;
1139 case AF_INET6:
1140 return (xfrm_address_t *)&fl->fl6_src;
1141 }
1142 return NULL;
1143 }
1144
1145 static __inline__
1146 void xfrm_flowi_addr_get(struct flowi *fl,
1147 xfrm_address_t *saddr, xfrm_address_t *daddr,
1148 unsigned short family)
1149 {
1150 switch(family) {
1151 case AF_INET:
1152 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1153 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1154 break;
1155 case AF_INET6:
1156 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1157 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1158 break;
1159 }
1160 }
1161
1162 static __inline__ int
1163 __xfrm4_state_addr_check(struct xfrm_state *x,
1164 xfrm_address_t *daddr, xfrm_address_t *saddr)
1165 {
1166 if (daddr->a4 == x->id.daddr.a4 &&
1167 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1168 return 1;
1169 return 0;
1170 }
1171
1172 static __inline__ int
1173 __xfrm6_state_addr_check(struct xfrm_state *x,
1174 xfrm_address_t *daddr, xfrm_address_t *saddr)
1175 {
1176 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1177 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1178 ipv6_addr_any((struct in6_addr *)saddr) ||
1179 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1180 return 1;
1181 return 0;
1182 }
1183
1184 static __inline__ int
1185 xfrm_state_addr_check(struct xfrm_state *x,
1186 xfrm_address_t *daddr, xfrm_address_t *saddr,
1187 unsigned short family)
1188 {
1189 switch (family) {
1190 case AF_INET:
1191 return __xfrm4_state_addr_check(x, daddr, saddr);
1192 case AF_INET6:
1193 return __xfrm6_state_addr_check(x, daddr, saddr);
1194 }
1195 return 0;
1196 }
1197
1198 static __inline__ int
1199 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1200 unsigned short family)
1201 {
1202 switch (family) {
1203 case AF_INET:
1204 return __xfrm4_state_addr_check(x,
1205 (xfrm_address_t *)&fl->fl4_dst,
1206 (xfrm_address_t *)&fl->fl4_src);
1207 case AF_INET6:
1208 return __xfrm6_state_addr_check(x,
1209 (xfrm_address_t *)&fl->fl6_dst,
1210 (xfrm_address_t *)&fl->fl6_src);
1211 }
1212 return 0;
1213 }
1214
1215 static inline int xfrm_state_kern(struct xfrm_state *x)
1216 {
1217 return atomic_read(&x->tunnel_users);
1218 }
1219
1220 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1221 {
1222 return (!userproto || proto == userproto ||
1223 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1224 proto == IPPROTO_ESP ||
1225 proto == IPPROTO_COMP)));
1226 }
1227
1228 /*
1229 * xfrm algorithm information
1230 */
1231 struct xfrm_algo_aead_info {
1232 u16 icv_truncbits;
1233 };
1234
1235 struct xfrm_algo_auth_info {
1236 u16 icv_truncbits;
1237 u16 icv_fullbits;
1238 };
1239
1240 struct xfrm_algo_encr_info {
1241 u16 blockbits;
1242 u16 defkeybits;
1243 };
1244
1245 struct xfrm_algo_comp_info {
1246 u16 threshold;
1247 };
1248
1249 struct xfrm_algo_desc {
1250 char *name;
1251 char *compat;
1252 u8 available:1;
1253 union {
1254 struct xfrm_algo_aead_info aead;
1255 struct xfrm_algo_auth_info auth;
1256 struct xfrm_algo_encr_info encr;
1257 struct xfrm_algo_comp_info comp;
1258 } uinfo;
1259 struct sadb_alg desc;
1260 };
1261
1262 /* XFRM tunnel handlers. */
1263 struct xfrm_tunnel {
1264 int (*handler)(struct sk_buff *skb);
1265 int (*err_handler)(struct sk_buff *skb, u32 info);
1266
1267 struct xfrm_tunnel *next;
1268 int priority;
1269 };
1270
1271 struct xfrm6_tunnel {
1272 int (*handler)(struct sk_buff *skb);
1273 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1274 u8 type, u8 code, int offset, __be32 info);
1275 struct xfrm6_tunnel *next;
1276 int priority;
1277 };
1278
1279 extern void xfrm_init(void);
1280 extern void xfrm4_init(int rt_hash_size);
1281 extern int xfrm_state_init(struct net *net);
1282 extern void xfrm_state_fini(struct net *net);
1283 extern void xfrm4_state_init(void);
1284 #ifdef CONFIG_XFRM
1285 extern int xfrm6_init(void);
1286 extern void xfrm6_fini(void);
1287 extern int xfrm6_state_init(void);
1288 extern void xfrm6_state_fini(void);
1289 #else
1290 static inline int xfrm6_init(void)
1291 {
1292 return 0;
1293 }
1294 static inline void xfrm6_fini(void)
1295 {
1296 ;
1297 }
1298 #endif
1299
1300 #ifdef CONFIG_XFRM_STATISTICS
1301 extern int xfrm_proc_init(struct net *net);
1302 extern void xfrm_proc_fini(struct net *net);
1303 #endif
1304
1305 extern int xfrm_sysctl_init(struct net *net);
1306 #ifdef CONFIG_SYSCTL
1307 extern void xfrm_sysctl_fini(struct net *net);
1308 #else
1309 static inline void xfrm_sysctl_fini(struct net *net)
1310 {
1311 }
1312 #endif
1313
1314 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1315 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1316 int (*func)(struct xfrm_state *, int, void*), void *);
1317 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1318 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1319 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1320 struct flowi *fl, struct xfrm_tmpl *tmpl,
1321 struct xfrm_policy *pol, int *err,
1322 unsigned short family);
1323 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1324 xfrm_address_t *daddr,
1325 xfrm_address_t *saddr,
1326 unsigned short family,
1327 u8 mode, u8 proto, u32 reqid);
1328 extern int xfrm_state_check_expire(struct xfrm_state *x);
1329 extern void xfrm_state_insert(struct xfrm_state *x);
1330 extern int xfrm_state_add(struct xfrm_state *x);
1331 extern int xfrm_state_update(struct xfrm_state *x);
1332 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1333 xfrm_address_t *daddr, __be32 spi,
1334 u8 proto, unsigned short family);
1335 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1336 xfrm_address_t *daddr,
1337 xfrm_address_t *saddr,
1338 u8 proto,
1339 unsigned short family);
1340 #ifdef CONFIG_XFRM_SUB_POLICY
1341 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1342 int n, unsigned short family);
1343 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1344 int n, unsigned short family);
1345 #else
1346 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1347 int n, unsigned short family)
1348 {
1349 return -ENOSYS;
1350 }
1351
1352 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1353 int n, unsigned short family)
1354 {
1355 return -ENOSYS;
1356 }
1357 #endif
1358
1359 struct xfrmk_sadinfo {
1360 u32 sadhcnt; /* current hash bkts */
1361 u32 sadhmcnt; /* max allowed hash bkts */
1362 u32 sadcnt; /* current running count */
1363 };
1364
1365 struct xfrmk_spdinfo {
1366 u32 incnt;
1367 u32 outcnt;
1368 u32 fwdcnt;
1369 u32 inscnt;
1370 u32 outscnt;
1371 u32 fwdscnt;
1372 u32 spdhcnt;
1373 u32 spdhmcnt;
1374 };
1375
1376 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1377 u32 seq);
1378 extern int xfrm_state_delete(struct xfrm_state *x);
1379 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1380 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1381 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1382 extern int xfrm_replay_check(struct xfrm_state *x,
1383 struct sk_buff *skb, __be32 seq);
1384 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1385 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1386 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1387 extern int xfrm_init_state(struct xfrm_state *x);
1388 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1389 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1390 int encap_type);
1391 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1392 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1393 extern int xfrm_output(struct sk_buff *skb);
1394 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1395 extern int xfrm4_extract_header(struct sk_buff *skb);
1396 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1397 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1398 int encap_type);
1399 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1400 extern int xfrm4_rcv(struct sk_buff *skb);
1401
1402 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1403 {
1404 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1405 }
1406
1407 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1408 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1409 extern int xfrm4_output(struct sk_buff *skb);
1410 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1411 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1412 extern int xfrm6_extract_header(struct sk_buff *skb);
1413 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1414 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1415 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1416 extern int xfrm6_rcv(struct sk_buff *skb);
1417 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1418 xfrm_address_t *saddr, u8 proto);
1419 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1420 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1421 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1422 extern void xfrm6_tunnel_free_spi(struct net *net, xfrm_address_t *saddr);
1423 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, xfrm_address_t *saddr);
1424 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1425 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1426 extern int xfrm6_output(struct sk_buff *skb);
1427 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1428 u8 **prevhdr);
1429
1430 #ifdef CONFIG_XFRM
1431 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1432 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1433 #else
1434 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1435 {
1436 return -ENOPROTOOPT;
1437 }
1438
1439 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1440 {
1441 /* should not happen */
1442 kfree_skb(skb);
1443 return 0;
1444 }
1445 #endif
1446
1447 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1448
1449 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1450 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1451 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1452 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1453 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1454 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1455 u8 type, int dir,
1456 struct xfrm_selector *sel,
1457 struct xfrm_sec_ctx *ctx, int delete,
1458 int *err);
1459 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1460 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1461 u32 xfrm_get_acqseq(void);
1462 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1463 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1464 u8 mode, u32 reqid, u8 proto,
1465 xfrm_address_t *daddr,
1466 xfrm_address_t *saddr, int create,
1467 unsigned short family);
1468 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1469 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1470 struct flowi *fl, int family, int strict);
1471
1472 #ifdef CONFIG_XFRM_MIGRATE
1473 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1474 struct xfrm_migrate *m, int num_bundles,
1475 struct xfrm_kmaddress *k);
1476 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1477 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1478 struct xfrm_migrate *m);
1479 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1480 struct xfrm_migrate *m, int num_bundles,
1481 struct xfrm_kmaddress *k);
1482 #endif
1483
1484 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1485 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1486 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1487
1488 extern void xfrm_input_init(void);
1489 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1490
1491 extern void xfrm_probe_algs(void);
1492 extern int xfrm_count_auth_supported(void);
1493 extern int xfrm_count_enc_supported(void);
1494 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1495 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1496 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1497 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1498 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1499 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1500 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1501 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1502 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1503 int probe);
1504
1505 struct hash_desc;
1506 struct scatterlist;
1507 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1508 unsigned int);
1509
1510 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1511 int family)
1512 {
1513 switch (family) {
1514 default:
1515 case AF_INET:
1516 return (__force u32)a->a4 - (__force u32)b->a4;
1517 case AF_INET6:
1518 return ipv6_addr_cmp((struct in6_addr *)a,
1519 (struct in6_addr *)b);
1520 }
1521 }
1522
1523 static inline int xfrm_policy_id2dir(u32 index)
1524 {
1525 return index & 7;
1526 }
1527
1528 #ifdef CONFIG_XFRM
1529 static inline int xfrm_aevent_is_on(struct net *net)
1530 {
1531 struct sock *nlsk;
1532 int ret = 0;
1533
1534 rcu_read_lock();
1535 nlsk = rcu_dereference(net->xfrm.nlsk);
1536 if (nlsk)
1537 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1538 rcu_read_unlock();
1539 return ret;
1540 }
1541 #endif
1542
1543 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1544 {
1545 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1546 }
1547
1548 static inline int xfrm_alg_auth_len(struct xfrm_algo_auth *alg)
1549 {
1550 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1551 }
1552
1553 #ifdef CONFIG_XFRM_MIGRATE
1554 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1555 {
1556 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1557 }
1558
1559 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1560 {
1561 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1562 }
1563
1564 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1565 {
1566 int i;
1567 for (i = 0; i < n; i++)
1568 xfrm_state_put(*(states + i));
1569 }
1570
1571 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1572 {
1573 int i;
1574 for (i = 0; i < n; i++)
1575 xfrm_state_delete(*(states + i));
1576 }
1577 #endif
1578
1579 #ifdef CONFIG_XFRM
1580 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1581 {
1582 return skb->sp->xvec[skb->sp->len - 1];
1583 }
1584 #endif
1585
1586 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1587 {
1588 if (attrs[XFRMA_MARK])
1589 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1590 else
1591 m->v = m->m = 0;
1592
1593 return m->v & m->m;
1594 }
1595
1596 static inline int xfrm_mark_put(struct sk_buff *skb, struct xfrm_mark *m)
1597 {
1598 if (m->m | m->v)
1599 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1600 return 0;
1601
1602 nla_put_failure:
1603 return -1;
1604 }
1605
1606 #endif /* _NET_XFRM_H */
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