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netns xfrm: add struct xfrm_policy::xp_net
[linux-2.6/btrfs-unstable.git] / include / net / xfrm.h
blob1ab17565f01c714f97657e7c6e3fdea8d8f21c0e
1 #ifndef _NET_XFRM_H
2 #define _NET_XFRM_H
3
4 #include <linux/compiler.h>
5 #include <linux/xfrm.h>
6 #include <linux/spinlock.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9 #include <linux/socket.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/ipsec.h>
12 #include <linux/in6.h>
13 #include <linux/mutex.h>
14 #include <linux/audit.h>
15
16 #include <net/sock.h>
17 #include <net/dst.h>
18 #include <net/ip.h>
19 #include <net/route.h>
20 #include <net/ipv6.h>
21 #include <net/ip6_fib.h>
22 #ifdef CONFIG_XFRM_STATISTICS
23 #include <net/snmp.h>
24 #endif
25
26 #define XFRM_PROTO_ESP 50
27 #define XFRM_PROTO_AH 51
28 #define XFRM_PROTO_COMP 108
29 #define XFRM_PROTO_IPIP 4
30 #define XFRM_PROTO_IPV6 41
31 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
32 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
33
34 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
35 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
36 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
37 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
38 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
39
40 #ifdef CONFIG_XFRM_STATISTICS
41 DECLARE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics);
42 #define XFRM_INC_STATS(field) SNMP_INC_STATS(xfrm_statistics, field)
43 #define XFRM_INC_STATS_BH(field) SNMP_INC_STATS_BH(xfrm_statistics, field)
44 #define XFRM_INC_STATS_USER(field) SNMP_INC_STATS_USER(xfrm_statistics, field)
45 #else
46 #define XFRM_INC_STATS(field)
47 #define XFRM_INC_STATS_BH(field)
48 #define XFRM_INC_STATS_USER(field)
49 #endif
50
51 extern struct sock *xfrm_nl;
52 extern u32 sysctl_xfrm_aevent_etime;
53 extern u32 sysctl_xfrm_aevent_rseqth;
54 extern int sysctl_xfrm_larval_drop;
55 extern u32 sysctl_xfrm_acq_expires;
56
57 extern struct mutex xfrm_cfg_mutex;
58
59 /* Organization of SPD aka "XFRM rules"
60 ------------------------------------
61
62 Basic objects:
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
67
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72
73 Lookup is plain linear search until the first match with selector.
74
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
81
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
85 |---. child .-> NULL
86
87 Bundles are cached at xrfm_policy struct (field ->bundles).
88
89
90 Resolution of xrfm_tmpl
91 -----------------------
92 Template contains:
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
103 flow id?
104
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
108
109 PROBLEMS:
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
118 */
119
120 struct xfrm_state_walk {
121 struct list_head all;
122 u8 state;
123 union {
124 u8 dying;
125 u8 proto;
126 };
127 u32 seq;
128 };
129
130 /* Full description of state of transformer. */
131 struct xfrm_state
132 {
133 #ifdef CONFIG_NET_NS
134 struct net *xs_net;
135 #endif
136 union {
137 struct hlist_node gclist;
138 struct hlist_node bydst;
139 };
140 struct hlist_node bysrc;
141 struct hlist_node byspi;
142
143 atomic_t refcnt;
144 spinlock_t lock;
145
146 struct xfrm_id id;
147 struct xfrm_selector sel;
148
149 u32 genid;
150
151 /* Key manager bits */
152 struct xfrm_state_walk km;
153
154 /* Parameters of this state. */
155 struct {
156 u32 reqid;
157 u8 mode;
158 u8 replay_window;
159 u8 aalgo, ealgo, calgo;
160 u8 flags;
161 u16 family;
162 xfrm_address_t saddr;
163 int header_len;
164 int trailer_len;
165 } props;
166
167 struct xfrm_lifetime_cfg lft;
168
169 /* Data for transformer */
170 struct xfrm_algo *aalg;
171 struct xfrm_algo *ealg;
172 struct xfrm_algo *calg;
173 struct xfrm_algo_aead *aead;
174
175 /* Data for encapsulator */
176 struct xfrm_encap_tmpl *encap;
177
178 /* Data for care-of address */
179 xfrm_address_t *coaddr;
180
181 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
182 struct xfrm_state *tunnel;
183
184 /* If a tunnel, number of users + 1 */
185 atomic_t tunnel_users;
186
187 /* State for replay detection */
188 struct xfrm_replay_state replay;
189
190 /* Replay detection state at the time we sent the last notification */
191 struct xfrm_replay_state preplay;
192
193 /* internal flag that only holds state for delayed aevent at the
194 * moment
195 */
196 u32 xflags;
197
198 /* Replay detection notification settings */
199 u32 replay_maxage;
200 u32 replay_maxdiff;
201
202 /* Replay detection notification timer */
203 struct timer_list rtimer;
204
205 /* Statistics */
206 struct xfrm_stats stats;
207
208 struct xfrm_lifetime_cur curlft;
209 struct timer_list timer;
210
211 /* Last used time */
212 unsigned long lastused;
213
214 /* Reference to data common to all the instances of this
215 * transformer. */
216 const struct xfrm_type *type;
217 struct xfrm_mode *inner_mode;
218 struct xfrm_mode *inner_mode_iaf;
219 struct xfrm_mode *outer_mode;
220
221 /* Security context */
222 struct xfrm_sec_ctx *security;
223
224 /* Private data of this transformer, format is opaque,
225 * interpreted by xfrm_type methods. */
226 void *data;
227 };
228
229 static inline struct net *xs_net(struct xfrm_state *x)
230 {
231 return read_pnet(&x->xs_net);
232 }
233
234 /* xflags - make enum if more show up */
235 #define XFRM_TIME_DEFER 1
236
237 enum {
238 XFRM_STATE_VOID,
239 XFRM_STATE_ACQ,
240 XFRM_STATE_VALID,
241 XFRM_STATE_ERROR,
242 XFRM_STATE_EXPIRED,
243 XFRM_STATE_DEAD
244 };
245
246 /* callback structure passed from either netlink or pfkey */
247 struct km_event
248 {
249 union {
250 u32 hard;
251 u32 proto;
252 u32 byid;
253 u32 aevent;
254 u32 type;
255 } data;
256
257 u32 seq;
258 u32 pid;
259 u32 event;
260 };
261
262 struct net_device;
263 struct xfrm_type;
264 struct xfrm_dst;
265 struct xfrm_policy_afinfo {
266 unsigned short family;
267 struct dst_ops *dst_ops;
268 void (*garbage_collect)(void);
269 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
270 xfrm_address_t *daddr);
271 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
272 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
273 void (*decode_session)(struct sk_buff *skb,
274 struct flowi *fl,
275 int reverse);
276 int (*get_tos)(struct flowi *fl);
277 int (*init_path)(struct xfrm_dst *path,
278 struct dst_entry *dst,
279 int nfheader_len);
280 int (*fill_dst)(struct xfrm_dst *xdst,
281 struct net_device *dev);
282 };
283
284 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
285 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
286 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
287 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
288
289 struct xfrm_tmpl;
290 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
291 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
292 extern int __xfrm_state_delete(struct xfrm_state *x);
293
294 struct xfrm_state_afinfo {
295 unsigned int family;
296 unsigned int proto;
297 __be16 eth_proto;
298 struct module *owner;
299 const struct xfrm_type *type_map[IPPROTO_MAX];
300 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
301 int (*init_flags)(struct xfrm_state *x);
302 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
303 struct xfrm_tmpl *tmpl,
304 xfrm_address_t *daddr, xfrm_address_t *saddr);
305 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
306 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
307 int (*output)(struct sk_buff *skb);
308 int (*extract_input)(struct xfrm_state *x,
309 struct sk_buff *skb);
310 int (*extract_output)(struct xfrm_state *x,
311 struct sk_buff *skb);
312 int (*transport_finish)(struct sk_buff *skb,
313 int async);
314 };
315
316 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
317 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
318
319 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
320
321 struct xfrm_type
322 {
323 char *description;
324 struct module *owner;
325 __u8 proto;
326 __u8 flags;
327 #define XFRM_TYPE_NON_FRAGMENT 1
328 #define XFRM_TYPE_REPLAY_PROT 2
329 #define XFRM_TYPE_LOCAL_COADDR 4
330 #define XFRM_TYPE_REMOTE_COADDR 8
331
332 int (*init_state)(struct xfrm_state *x);
333 void (*destructor)(struct xfrm_state *);
334 int (*input)(struct xfrm_state *, struct sk_buff *skb);
335 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
336 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
337 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
338 /* Estimate maximal size of result of transformation of a dgram */
339 u32 (*get_mtu)(struct xfrm_state *, int size);
340 };
341
342 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
343 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
344
345 struct xfrm_mode {
346 /*
347 * Remove encapsulation header.
348 *
349 * The IP header will be moved over the top of the encapsulation
350 * header.
351 *
352 * On entry, the transport header shall point to where the IP header
353 * should be and the network header shall be set to where the IP
354 * header currently is. skb->data shall point to the start of the
355 * payload.
356 */
357 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
358
359 /*
360 * This is the actual input entry point.
361 *
362 * For transport mode and equivalent this would be identical to
363 * input2 (which does not need to be set). While tunnel mode
364 * and equivalent would set this to the tunnel encapsulation function
365 * xfrm4_prepare_input that would in turn call input2.
366 */
367 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
368
369 /*
370 * Add encapsulation header.
371 *
372 * On exit, the transport header will be set to the start of the
373 * encapsulation header to be filled in by x->type->output and
374 * the mac header will be set to the nextheader (protocol for
375 * IPv4) field of the extension header directly preceding the
376 * encapsulation header, or in its absence, that of the top IP
377 * header. The value of the network header will always point
378 * to the top IP header while skb->data will point to the payload.
379 */
380 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
381
382 /*
383 * This is the actual output entry point.
384 *
385 * For transport mode and equivalent this would be identical to
386 * output2 (which does not need to be set). While tunnel mode
387 * and equivalent would set this to a tunnel encapsulation function
388 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
389 * call output2.
390 */
391 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
392
393 struct xfrm_state_afinfo *afinfo;
394 struct module *owner;
395 unsigned int encap;
396 int flags;
397 };
398
399 /* Flags for xfrm_mode. */
400 enum {
401 XFRM_MODE_FLAG_TUNNEL = 1,
402 };
403
404 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
405 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
406
407 static inline int xfrm_af2proto(unsigned int family)
408 {
409 switch(family) {
410 case AF_INET:
411 return IPPROTO_IPIP;
412 case AF_INET6:
413 return IPPROTO_IPV6;
414 default:
415 return 0;
416 }
417 }
418
419 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
420 {
421 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
422 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
423 return x->inner_mode;
424 else
425 return x->inner_mode_iaf;
426 }
427
428 struct xfrm_tmpl
429 {
430 /* id in template is interpreted as:
431 * daddr - destination of tunnel, may be zero for transport mode.
432 * spi - zero to acquire spi. Not zero if spi is static, then
433 * daddr must be fixed too.
434 * proto - AH/ESP/IPCOMP
435 */
436 struct xfrm_id id;
437
438 /* Source address of tunnel. Ignored, if it is not a tunnel. */
439 xfrm_address_t saddr;
440
441 unsigned short encap_family;
442
443 __u32 reqid;
444
445 /* Mode: transport, tunnel etc. */
446 __u8 mode;
447
448 /* Sharing mode: unique, this session only, this user only etc. */
449 __u8 share;
450
451 /* May skip this transfomration if no SA is found */
452 __u8 optional;
453
454 /* Skip aalgos/ealgos/calgos checks. */
455 __u8 allalgs;
456
457 /* Bit mask of algos allowed for acquisition */
458 __u32 aalgos;
459 __u32 ealgos;
460 __u32 calgos;
461 };
462
463 #define XFRM_MAX_DEPTH 6
464
465 struct xfrm_policy_walk_entry {
466 struct list_head all;
467 u8 dead;
468 };
469
470 struct xfrm_policy_walk {
471 struct xfrm_policy_walk_entry walk;
472 u8 type;
473 u32 seq;
474 };
475
476 struct xfrm_policy
477 {
478 #ifdef CONFIG_NET_NS
479 struct net *xp_net;
480 #endif
481 struct hlist_node bydst;
482 struct hlist_node byidx;
483
484 /* This lock only affects elements except for entry. */
485 rwlock_t lock;
486 atomic_t refcnt;
487 struct timer_list timer;
488
489 u32 priority;
490 u32 index;
491 struct xfrm_selector selector;
492 struct xfrm_lifetime_cfg lft;
493 struct xfrm_lifetime_cur curlft;
494 struct dst_entry *bundles;
495 struct xfrm_policy_walk_entry walk;
496 u8 type;
497 u8 action;
498 u8 flags;
499 u8 xfrm_nr;
500 u16 family;
501 struct xfrm_sec_ctx *security;
502 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
503 };
504
505 static inline struct net *xp_net(struct xfrm_policy *xp)
506 {
507 return read_pnet(&xp->xp_net);
508 }
509
510 struct xfrm_kmaddress {
511 xfrm_address_t local;
512 xfrm_address_t remote;
513 u32 reserved;
514 u16 family;
515 };
516
517 struct xfrm_migrate {
518 xfrm_address_t old_daddr;
519 xfrm_address_t old_saddr;
520 xfrm_address_t new_daddr;
521 xfrm_address_t new_saddr;
522 u8 proto;
523 u8 mode;
524 u16 reserved;
525 u32 reqid;
526 u16 old_family;
527 u16 new_family;
528 };
529
530 #define XFRM_KM_TIMEOUT 30
531 /* which seqno */
532 #define XFRM_REPLAY_SEQ 1
533 #define XFRM_REPLAY_OSEQ 2
534 #define XFRM_REPLAY_SEQ_MASK 3
535 /* what happened */
536 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
537 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
538
539 /* default aevent timeout in units of 100ms */
540 #define XFRM_AE_ETIME 10
541 /* Async Event timer multiplier */
542 #define XFRM_AE_ETH_M 10
543 /* default seq threshold size */
544 #define XFRM_AE_SEQT_SIZE 2
545
546 struct xfrm_mgr
547 {
548 struct list_head list;
549 char *id;
550 int (*notify)(struct xfrm_state *x, struct km_event *c);
551 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
552 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
553 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
554 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
555 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
556 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
557 };
558
559 extern int xfrm_register_km(struct xfrm_mgr *km);
560 extern int xfrm_unregister_km(struct xfrm_mgr *km);
561
562 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
563
564 /*
565 * This structure is used for the duration where packets are being
566 * transformed by IPsec. As soon as the packet leaves IPsec the
567 * area beyond the generic IP part may be overwritten.
568 */
569 struct xfrm_skb_cb {
570 union {
571 struct inet_skb_parm h4;
572 struct inet6_skb_parm h6;
573 } header;
574
575 /* Sequence number for replay protection. */
576 union {
577 u64 output;
578 __be32 input;
579 } seq;
580 };
581
582 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
583
584 /*
585 * This structure is used by the afinfo prepare_input/prepare_output functions
586 * to transmit header information to the mode input/output functions.
587 */
588 struct xfrm_mode_skb_cb {
589 union {
590 struct inet_skb_parm h4;
591 struct inet6_skb_parm h6;
592 } header;
593
594 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
595 __be16 id;
596 __be16 frag_off;
597
598 /* IP header length (excluding options or extension headers). */
599 u8 ihl;
600
601 /* TOS for IPv4, class for IPv6. */
602 u8 tos;
603
604 /* TTL for IPv4, hop limitfor IPv6. */
605 u8 ttl;
606
607 /* Protocol for IPv4, NH for IPv6. */
608 u8 protocol;
609
610 /* Option length for IPv4, zero for IPv6. */
611 u8 optlen;
612
613 /* Used by IPv6 only, zero for IPv4. */
614 u8 flow_lbl[3];
615 };
616
617 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
618
619 /*
620 * This structure is used by the input processing to locate the SPI and
621 * related information.
622 */
623 struct xfrm_spi_skb_cb {
624 union {
625 struct inet_skb_parm h4;
626 struct inet6_skb_parm h6;
627 } header;
628
629 unsigned int daddroff;
630 unsigned int family;
631 };
632
633 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
634
635 /* Audit Information */
636 struct xfrm_audit
637 {
638 u32 secid;
639 uid_t loginuid;
640 u32 sessionid;
641 };
642
643 #ifdef CONFIG_AUDITSYSCALL
644 static inline struct audit_buffer *xfrm_audit_start(const char *op)
645 {
646 struct audit_buffer *audit_buf = NULL;
647
648 if (audit_enabled == 0)
649 return NULL;
650 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
651 AUDIT_MAC_IPSEC_EVENT);
652 if (audit_buf == NULL)
653 return NULL;
654 audit_log_format(audit_buf, "op=%s", op);
655 return audit_buf;
656 }
657
658 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
659 struct audit_buffer *audit_buf)
660 {
661 char *secctx;
662 u32 secctx_len;
663
664 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
665 if (secid != 0 &&
666 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
667 audit_log_format(audit_buf, " subj=%s", secctx);
668 security_release_secctx(secctx, secctx_len);
669 } else
670 audit_log_task_context(audit_buf);
671 }
672
673 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
674 u32 auid, u32 ses, u32 secid);
675 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
676 u32 auid, u32 ses, u32 secid);
677 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
678 u32 auid, u32 ses, u32 secid);
679 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
680 u32 auid, u32 ses, u32 secid);
681 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
682 struct sk_buff *skb);
683 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
684 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
685 __be32 net_spi, __be32 net_seq);
686 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
687 struct sk_buff *skb, u8 proto);
688 #else
689
690 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
691 u32 auid, u32 ses, u32 secid)
692 {
693 }
694
695 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
696 u32 auid, u32 ses, u32 secid)
697 {
698 }
699
700 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
701 u32 auid, u32 ses, u32 secid)
702 {
703 }
704
705 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
706 u32 auid, u32 ses, u32 secid)
707 {
708 }
709
710 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
711 struct sk_buff *skb)
712 {
713 }
714
715 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
716 u16 family)
717 {
718 }
719
720 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
721 __be32 net_spi, __be32 net_seq)
722 {
723 }
724
725 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
726 struct sk_buff *skb, u8 proto)
727 {
728 }
729 #endif /* CONFIG_AUDITSYSCALL */
730
731 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
732 {
733 if (likely(policy != NULL))
734 atomic_inc(&policy->refcnt);
735 }
736
737 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
738
739 static inline void xfrm_pol_put(struct xfrm_policy *policy)
740 {
741 if (atomic_dec_and_test(&policy->refcnt))
742 xfrm_policy_destroy(policy);
743 }
744
745 #ifdef CONFIG_XFRM_SUB_POLICY
746 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
747 {
748 int i;
749 for (i = npols - 1; i >= 0; --i)
750 xfrm_pol_put(pols[i]);
751 }
752 #else
753 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
754 {
755 xfrm_pol_put(pols[0]);
756 }
757 #endif
758
759 extern void __xfrm_state_destroy(struct xfrm_state *);
760
761 static inline void __xfrm_state_put(struct xfrm_state *x)
762 {
763 atomic_dec(&x->refcnt);
764 }
765
766 static inline void xfrm_state_put(struct xfrm_state *x)
767 {
768 if (atomic_dec_and_test(&x->refcnt))
769 __xfrm_state_destroy(x);
770 }
771
772 static inline void xfrm_state_hold(struct xfrm_state *x)
773 {
774 atomic_inc(&x->refcnt);
775 }
776
777 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
778 {
779 __be32 *a1 = token1;
780 __be32 *a2 = token2;
781 int pdw;
782 int pbi;
783
784 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
785 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
786
787 if (pdw)
788 if (memcmp(a1, a2, pdw << 2))
789 return 0;
790
791 if (pbi) {
792 __be32 mask;
793
794 mask = htonl((0xffffffff) << (32 - pbi));
795
796 if ((a1[pdw] ^ a2[pdw]) & mask)
797 return 0;
798 }
799
800 return 1;
801 }
802
803 static __inline__
804 __be16 xfrm_flowi_sport(struct flowi *fl)
805 {
806 __be16 port;
807 switch(fl->proto) {
808 case IPPROTO_TCP:
809 case IPPROTO_UDP:
810 case IPPROTO_UDPLITE:
811 case IPPROTO_SCTP:
812 port = fl->fl_ip_sport;
813 break;
814 case IPPROTO_ICMP:
815 case IPPROTO_ICMPV6:
816 port = htons(fl->fl_icmp_type);
817 break;
818 case IPPROTO_MH:
819 port = htons(fl->fl_mh_type);
820 break;
821 default:
822 port = 0; /*XXX*/
823 }
824 return port;
825 }
826
827 static __inline__
828 __be16 xfrm_flowi_dport(struct flowi *fl)
829 {
830 __be16 port;
831 switch(fl->proto) {
832 case IPPROTO_TCP:
833 case IPPROTO_UDP:
834 case IPPROTO_UDPLITE:
835 case IPPROTO_SCTP:
836 port = fl->fl_ip_dport;
837 break;
838 case IPPROTO_ICMP:
839 case IPPROTO_ICMPV6:
840 port = htons(fl->fl_icmp_code);
841 break;
842 default:
843 port = 0; /*XXX*/
844 }
845 return port;
846 }
847
848 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
849 unsigned short family);
850
851 #ifdef CONFIG_SECURITY_NETWORK_XFRM
852 /* If neither has a context --> match
853 * Otherwise, both must have a context and the sids, doi, alg must match
854 */
855 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
856 {
857 return ((!s1 && !s2) ||
858 (s1 && s2 &&
859 (s1->ctx_sid == s2->ctx_sid) &&
860 (s1->ctx_doi == s2->ctx_doi) &&
861 (s1->ctx_alg == s2->ctx_alg)));
862 }
863 #else
864 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
865 {
866 return 1;
867 }
868 #endif
869
870 /* A struct encoding bundle of transformations to apply to some set of flow.
871 *
872 * dst->child points to the next element of bundle.
873 * dst->xfrm points to an instanse of transformer.
874 *
875 * Due to unfortunate limitations of current routing cache, which we
876 * have no time to fix, it mirrors struct rtable and bound to the same
877 * routing key, including saddr,daddr. However, we can have many of
878 * bundles differing by session id. All the bundles grow from a parent
879 * policy rule.
880 */
881 struct xfrm_dst
882 {
883 union {
884 struct dst_entry dst;
885 struct rtable rt;
886 struct rt6_info rt6;
887 } u;
888 struct dst_entry *route;
889 #ifdef CONFIG_XFRM_SUB_POLICY
890 struct flowi *origin;
891 struct xfrm_selector *partner;
892 #endif
893 u32 genid;
894 u32 route_mtu_cached;
895 u32 child_mtu_cached;
896 u32 route_cookie;
897 u32 path_cookie;
898 };
899
900 #ifdef CONFIG_XFRM
901 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
902 {
903 dst_release(xdst->route);
904 if (likely(xdst->u.dst.xfrm))
905 xfrm_state_put(xdst->u.dst.xfrm);
906 #ifdef CONFIG_XFRM_SUB_POLICY
907 kfree(xdst->origin);
908 xdst->origin = NULL;
909 kfree(xdst->partner);
910 xdst->partner = NULL;
911 #endif
912 }
913 #endif
914
915 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
916
917 struct sec_path
918 {
919 atomic_t refcnt;
920 int len;
921 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
922 };
923
924 static inline struct sec_path *
925 secpath_get(struct sec_path *sp)
926 {
927 if (sp)
928 atomic_inc(&sp->refcnt);
929 return sp;
930 }
931
932 extern void __secpath_destroy(struct sec_path *sp);
933
934 static inline void
935 secpath_put(struct sec_path *sp)
936 {
937 if (sp && atomic_dec_and_test(&sp->refcnt))
938 __secpath_destroy(sp);
939 }
940
941 extern struct sec_path *secpath_dup(struct sec_path *src);
942
943 static inline void
944 secpath_reset(struct sk_buff *skb)
945 {
946 #ifdef CONFIG_XFRM
947 secpath_put(skb->sp);
948 skb->sp = NULL;
949 #endif
950 }
951
952 static inline int
953 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
954 {
955 switch (family) {
956 case AF_INET:
957 return addr->a4 == 0;
958 case AF_INET6:
959 return ipv6_addr_any((struct in6_addr *)&addr->a6);
960 }
961 return 0;
962 }
963
964 static inline int
965 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
966 {
967 return (tmpl->saddr.a4 &&
968 tmpl->saddr.a4 != x->props.saddr.a4);
969 }
970
971 static inline int
972 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
973 {
974 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
975 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
976 }
977
978 static inline int
979 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
980 {
981 switch (family) {
982 case AF_INET:
983 return __xfrm4_state_addr_cmp(tmpl, x);
984 case AF_INET6:
985 return __xfrm6_state_addr_cmp(tmpl, x);
986 }
987 return !0;
988 }
989
990 #ifdef CONFIG_XFRM
991 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
992
993 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
994 struct sk_buff *skb,
995 unsigned int family, int reverse)
996 {
997 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
998
999 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1000 return __xfrm_policy_check(sk, ndir, skb, family);
1001
1002 return (!xfrm_policy_count[dir] && !skb->sp) ||
1003 (skb->dst->flags & DST_NOPOLICY) ||
1004 __xfrm_policy_check(sk, ndir, skb, family);
1005 }
1006
1007 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1008 {
1009 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1010 }
1011
1012 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1013 {
1014 return xfrm_policy_check(sk, dir, skb, AF_INET);
1015 }
1016
1017 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1018 {
1019 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1020 }
1021
1022 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1023 struct sk_buff *skb)
1024 {
1025 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1026 }
1027
1028 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1029 struct sk_buff *skb)
1030 {
1031 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1032 }
1033
1034 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1035 unsigned int family, int reverse);
1036
1037 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1038 unsigned int family)
1039 {
1040 return __xfrm_decode_session(skb, fl, family, 0);
1041 }
1042
1043 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1044 struct flowi *fl,
1045 unsigned int family)
1046 {
1047 return __xfrm_decode_session(skb, fl, family, 1);
1048 }
1049
1050 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1051
1052 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1053 {
1054 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
1055 (skb->dst->flags & DST_NOXFRM) ||
1056 __xfrm_route_forward(skb, family);
1057 }
1058
1059 static inline int xfrm4_route_forward(struct sk_buff *skb)
1060 {
1061 return xfrm_route_forward(skb, AF_INET);
1062 }
1063
1064 static inline int xfrm6_route_forward(struct sk_buff *skb)
1065 {
1066 return xfrm_route_forward(skb, AF_INET6);
1067 }
1068
1069 extern int __xfrm_sk_clone_policy(struct sock *sk);
1070
1071 static inline int xfrm_sk_clone_policy(struct sock *sk)
1072 {
1073 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1074 return __xfrm_sk_clone_policy(sk);
1075 return 0;
1076 }
1077
1078 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1079
1080 static inline void xfrm_sk_free_policy(struct sock *sk)
1081 {
1082 if (unlikely(sk->sk_policy[0] != NULL)) {
1083 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1084 sk->sk_policy[0] = NULL;
1085 }
1086 if (unlikely(sk->sk_policy[1] != NULL)) {
1087 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1088 sk->sk_policy[1] = NULL;
1089 }
1090 }
1091
1092 #else
1093
1094 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1095 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1096 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1097 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1098 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1099 {
1100 return 1;
1101 }
1102 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1103 {
1104 return 1;
1105 }
1106 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1107 {
1108 return 1;
1109 }
1110 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1111 struct flowi *fl,
1112 unsigned int family)
1113 {
1114 return -ENOSYS;
1115 }
1116 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1117 struct sk_buff *skb)
1118 {
1119 return 1;
1120 }
1121 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1122 struct sk_buff *skb)
1123 {
1124 return 1;
1125 }
1126 #endif
1127
1128 static __inline__
1129 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1130 {
1131 switch (family){
1132 case AF_INET:
1133 return (xfrm_address_t *)&fl->fl4_dst;
1134 case AF_INET6:
1135 return (xfrm_address_t *)&fl->fl6_dst;
1136 }
1137 return NULL;
1138 }
1139
1140 static __inline__
1141 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1142 {
1143 switch (family){
1144 case AF_INET:
1145 return (xfrm_address_t *)&fl->fl4_src;
1146 case AF_INET6:
1147 return (xfrm_address_t *)&fl->fl6_src;
1148 }
1149 return NULL;
1150 }
1151
1152 static __inline__
1153 void xfrm_flowi_addr_get(struct flowi *fl,
1154 xfrm_address_t *saddr, xfrm_address_t *daddr,
1155 unsigned short family)
1156 {
1157 switch(family) {
1158 case AF_INET:
1159 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1160 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1161 break;
1162 case AF_INET6:
1163 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1164 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1165 break;
1166 }
1167 }
1168
1169 static __inline__ int
1170 __xfrm4_state_addr_check(struct xfrm_state *x,
1171 xfrm_address_t *daddr, xfrm_address_t *saddr)
1172 {
1173 if (daddr->a4 == x->id.daddr.a4 &&
1174 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1175 return 1;
1176 return 0;
1177 }
1178
1179 static __inline__ int
1180 __xfrm6_state_addr_check(struct xfrm_state *x,
1181 xfrm_address_t *daddr, xfrm_address_t *saddr)
1182 {
1183 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1184 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1185 ipv6_addr_any((struct in6_addr *)saddr) ||
1186 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1187 return 1;
1188 return 0;
1189 }
1190
1191 static __inline__ int
1192 xfrm_state_addr_check(struct xfrm_state *x,
1193 xfrm_address_t *daddr, xfrm_address_t *saddr,
1194 unsigned short family)
1195 {
1196 switch (family) {
1197 case AF_INET:
1198 return __xfrm4_state_addr_check(x, daddr, saddr);
1199 case AF_INET6:
1200 return __xfrm6_state_addr_check(x, daddr, saddr);
1201 }
1202 return 0;
1203 }
1204
1205 static __inline__ int
1206 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1207 unsigned short family)
1208 {
1209 switch (family) {
1210 case AF_INET:
1211 return __xfrm4_state_addr_check(x,
1212 (xfrm_address_t *)&fl->fl4_dst,
1213 (xfrm_address_t *)&fl->fl4_src);
1214 case AF_INET6:
1215 return __xfrm6_state_addr_check(x,
1216 (xfrm_address_t *)&fl->fl6_dst,
1217 (xfrm_address_t *)&fl->fl6_src);
1218 }
1219 return 0;
1220 }
1221
1222 static inline int xfrm_state_kern(struct xfrm_state *x)
1223 {
1224 return atomic_read(&x->tunnel_users);
1225 }
1226
1227 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1228 {
1229 return (!userproto || proto == userproto ||
1230 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1231 proto == IPPROTO_ESP ||
1232 proto == IPPROTO_COMP)));
1233 }
1234
1235 /*
1236 * xfrm algorithm information
1237 */
1238 struct xfrm_algo_aead_info {
1239 u16 icv_truncbits;
1240 };
1241
1242 struct xfrm_algo_auth_info {
1243 u16 icv_truncbits;
1244 u16 icv_fullbits;
1245 };
1246
1247 struct xfrm_algo_encr_info {
1248 u16 blockbits;
1249 u16 defkeybits;
1250 };
1251
1252 struct xfrm_algo_comp_info {
1253 u16 threshold;
1254 };
1255
1256 struct xfrm_algo_desc {
1257 char *name;
1258 char *compat;
1259 u8 available:1;
1260 union {
1261 struct xfrm_algo_aead_info aead;
1262 struct xfrm_algo_auth_info auth;
1263 struct xfrm_algo_encr_info encr;
1264 struct xfrm_algo_comp_info comp;
1265 } uinfo;
1266 struct sadb_alg desc;
1267 };
1268
1269 /* XFRM tunnel handlers. */
1270 struct xfrm_tunnel {
1271 int (*handler)(struct sk_buff *skb);
1272 int (*err_handler)(struct sk_buff *skb, __u32 info);
1273
1274 struct xfrm_tunnel *next;
1275 int priority;
1276 };
1277
1278 struct xfrm6_tunnel {
1279 int (*handler)(struct sk_buff *skb);
1280 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1281 int type, int code, int offset, __be32 info);
1282 struct xfrm6_tunnel *next;
1283 int priority;
1284 };
1285
1286 extern void xfrm_init(void);
1287 extern void xfrm4_init(void);
1288 extern int xfrm_state_init(struct net *net);
1289 extern void xfrm_state_fini(struct net *net);
1290 extern void xfrm4_state_init(void);
1291 #ifdef CONFIG_XFRM
1292 extern int xfrm6_init(void);
1293 extern void xfrm6_fini(void);
1294 extern int xfrm6_state_init(void);
1295 extern void xfrm6_state_fini(void);
1296 #else
1297 static inline int xfrm6_init(void)
1298 {
1299 return 0;
1300 }
1301 static inline void xfrm6_fini(void)
1302 {
1303 ;
1304 }
1305 #endif
1306
1307 #ifdef CONFIG_XFRM_STATISTICS
1308 extern int xfrm_proc_init(void);
1309 #endif
1310
1311 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1312 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1313 int (*func)(struct xfrm_state *, int, void*), void *);
1314 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1315 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1316 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1317 struct flowi *fl, struct xfrm_tmpl *tmpl,
1318 struct xfrm_policy *pol, int *err,
1319 unsigned short family);
1320 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1321 xfrm_address_t *saddr,
1322 unsigned short family,
1323 u8 mode, u8 proto, u32 reqid);
1324 extern int xfrm_state_check_expire(struct xfrm_state *x);
1325 extern void xfrm_state_insert(struct xfrm_state *x);
1326 extern int xfrm_state_add(struct xfrm_state *x);
1327 extern int xfrm_state_update(struct xfrm_state *x);
1328 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1329 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1330 #ifdef CONFIG_XFRM_SUB_POLICY
1331 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1332 int n, unsigned short family);
1333 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1334 int n, unsigned short family);
1335 #else
1336 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1337 int n, unsigned short family)
1338 {
1339 return -ENOSYS;
1340 }
1341
1342 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1343 int n, unsigned short family)
1344 {
1345 return -ENOSYS;
1346 }
1347 #endif
1348
1349 struct xfrmk_sadinfo {
1350 u32 sadhcnt; /* current hash bkts */
1351 u32 sadhmcnt; /* max allowed hash bkts */
1352 u32 sadcnt; /* current running count */
1353 };
1354
1355 struct xfrmk_spdinfo {
1356 u32 incnt;
1357 u32 outcnt;
1358 u32 fwdcnt;
1359 u32 inscnt;
1360 u32 outscnt;
1361 u32 fwdscnt;
1362 u32 spdhcnt;
1363 u32 spdhmcnt;
1364 };
1365
1366 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1367 extern int xfrm_state_delete(struct xfrm_state *x);
1368 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1369 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1370 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1371 extern int xfrm_replay_check(struct xfrm_state *x,
1372 struct sk_buff *skb, __be32 seq);
1373 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1374 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1375 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1376 extern int xfrm_init_state(struct xfrm_state *x);
1377 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1378 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1379 int encap_type);
1380 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1381 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1382 extern int xfrm_output(struct sk_buff *skb);
1383 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1384 extern int xfrm4_extract_header(struct sk_buff *skb);
1385 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1386 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1387 int encap_type);
1388 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1389 extern int xfrm4_rcv(struct sk_buff *skb);
1390
1391 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1392 {
1393 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1394 }
1395
1396 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1397 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1398 extern int xfrm4_output(struct sk_buff *skb);
1399 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1400 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1401 extern int xfrm6_extract_header(struct sk_buff *skb);
1402 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1403 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1404 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1405 extern int xfrm6_rcv(struct sk_buff *skb);
1406 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1407 xfrm_address_t *saddr, u8 proto);
1408 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1409 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1410 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1411 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1412 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1413 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1414 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1415 extern int xfrm6_output(struct sk_buff *skb);
1416 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1417 u8 **prevhdr);
1418
1419 #ifdef CONFIG_XFRM
1420 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1421 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1422 #else
1423 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1424 {
1425 return -ENOPROTOOPT;
1426 }
1427
1428 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1429 {
1430 /* should not happen */
1431 kfree_skb(skb);
1432 return 0;
1433 }
1434 #endif
1435
1436 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1437
1438 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1439 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1440 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1441 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1442 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1443 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1444 struct xfrm_selector *sel,
1445 struct xfrm_sec_ctx *ctx, int delete,
1446 int *err);
1447 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1448 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1449 u32 xfrm_get_acqseq(void);
1450 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1451 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1452 xfrm_address_t *daddr, xfrm_address_t *saddr,
1453 int create, unsigned short family);
1454 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1455 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1456 struct flowi *fl, int family, int strict);
1457
1458 #ifdef CONFIG_XFRM_MIGRATE
1459 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1460 struct xfrm_migrate *m, int num_bundles,
1461 struct xfrm_kmaddress *k);
1462 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1463 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1464 struct xfrm_migrate *m);
1465 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1466 struct xfrm_migrate *m, int num_bundles,
1467 struct xfrm_kmaddress *k);
1468 #endif
1469
1470 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1471 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1472 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1473
1474 extern void xfrm_input_init(void);
1475 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1476
1477 extern void xfrm_probe_algs(void);
1478 extern int xfrm_count_auth_supported(void);
1479 extern int xfrm_count_enc_supported(void);
1480 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1481 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1482 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1483 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1484 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1485 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1486 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1487 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1488 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1489 int probe);
1490
1491 struct hash_desc;
1492 struct scatterlist;
1493 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1494 unsigned int);
1495
1496 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1497 int offset, int len, icv_update_fn_t icv_update);
1498
1499 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1500 int family)
1501 {
1502 switch (family) {
1503 default:
1504 case AF_INET:
1505 return (__force __u32)a->a4 - (__force __u32)b->a4;
1506 case AF_INET6:
1507 return ipv6_addr_cmp((struct in6_addr *)a,
1508 (struct in6_addr *)b);
1509 }
1510 }
1511
1512 static inline int xfrm_policy_id2dir(u32 index)
1513 {
1514 return index & 7;
1515 }
1516
1517 static inline int xfrm_aevent_is_on(void)
1518 {
1519 struct sock *nlsk;
1520 int ret = 0;
1521
1522 rcu_read_lock();
1523 nlsk = rcu_dereference(xfrm_nl);
1524 if (nlsk)
1525 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1526 rcu_read_unlock();
1527 return ret;
1528 }
1529
1530 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1531 {
1532 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1533 }
1534
1535 #ifdef CONFIG_XFRM_MIGRATE
1536 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1537 {
1538 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1539 }
1540
1541 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1542 {
1543 int i;
1544 for (i = 0; i < n; i++)
1545 xfrm_state_put(*(states + i));
1546 }
1547
1548 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1549 {
1550 int i;
1551 for (i = 0; i < n; i++)
1552 xfrm_state_delete(*(states + i));
1553 }
1554 #endif
1555
1556 #ifdef CONFIG_XFRM
1557 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1558 {
1559 return skb->sp->xvec[skb->sp->len - 1];
1560 }
1561 #endif
1562
1563 #endif /* _NET_XFRM_H */
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