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Add linux-next specific files for 20110831
[linux-2.6/next.git] / include / net / xfrm.h
blobb203e14d26b7f59a5f884b87183d3ecb74447d2a
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_ALIGN4(len) (((len) + 3) & ~3)
40 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
41 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
43 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
45
46 #ifdef CONFIG_XFRM_STATISTICS
47 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
48 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
49 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
50 #else
51 #define XFRM_INC_STATS(net, field) ((void)(net))
52 #define XFRM_INC_STATS_BH(net, field) ((void)(net))
53 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
54 #endif
55
56 extern struct mutex xfrm_cfg_mutex;
57
58 /* Organization of SPD aka "XFRM rules"
59 ------------------------------------
60
61 Basic objects:
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
66
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
71
72 Lookup is plain linear search until the first match with selector.
73
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
80
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
84 |---. child .-> NULL
85
86 Bundles are cached at xrfm_policy struct (field ->bundles).
87
88
89 Resolution of xrfm_tmpl
90 -----------------------
91 Template contains:
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
102 flow id?
103
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
107
108 PROBLEMS:
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
117 */
118
119 struct xfrm_state_walk {
120 struct list_head all;
121 u8 state;
122 union {
123 u8 dying;
124 u8 proto;
125 };
126 u32 seq;
127 };
128
129 /* Full description of state of transformer. */
130 struct xfrm_state {
131 #ifdef CONFIG_NET_NS
132 struct net *xs_net;
133 #endif
134 union {
135 struct hlist_node gclist;
136 struct hlist_node bydst;
137 };
138 struct hlist_node bysrc;
139 struct hlist_node byspi;
140
141 atomic_t refcnt;
142 spinlock_t lock;
143
144 struct xfrm_id id;
145 struct xfrm_selector sel;
146 struct xfrm_mark mark;
147 u32 tfcpad;
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_auth *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 struct xfrm_replay_state_esn *replay_esn;
190
191 /* Replay detection state at the time we sent the last notification */
192 struct xfrm_replay_state preplay;
193 struct xfrm_replay_state_esn *preplay_esn;
194
195 /* The functions for replay detection. */
196 struct xfrm_replay *repl;
197
198 /* internal flag that only holds state for delayed aevent at the
199 * moment
200 */
201 u32 xflags;
202
203 /* Replay detection notification settings */
204 u32 replay_maxage;
205 u32 replay_maxdiff;
206
207 /* Replay detection notification timer */
208 struct timer_list rtimer;
209
210 /* Statistics */
211 struct xfrm_stats stats;
212
213 struct xfrm_lifetime_cur curlft;
214 struct tasklet_hrtimer mtimer;
215
216 /* Last used time */
217 unsigned long lastused;
218
219 /* Reference to data common to all the instances of this
220 * transformer. */
221 const struct xfrm_type *type;
222 struct xfrm_mode *inner_mode;
223 struct xfrm_mode *inner_mode_iaf;
224 struct xfrm_mode *outer_mode;
225
226 /* Security context */
227 struct xfrm_sec_ctx *security;
228
229 /* Private data of this transformer, format is opaque,
230 * interpreted by xfrm_type methods. */
231 void *data;
232 };
233
234 static inline struct net *xs_net(struct xfrm_state *x)
235 {
236 return read_pnet(&x->xs_net);
237 }
238
239 /* xflags - make enum if more show up */
240 #define XFRM_TIME_DEFER 1
241
242 enum {
243 XFRM_STATE_VOID,
244 XFRM_STATE_ACQ,
245 XFRM_STATE_VALID,
246 XFRM_STATE_ERROR,
247 XFRM_STATE_EXPIRED,
248 XFRM_STATE_DEAD
249 };
250
251 /* callback structure passed from either netlink or pfkey */
252 struct km_event {
253 union {
254 u32 hard;
255 u32 proto;
256 u32 byid;
257 u32 aevent;
258 u32 type;
259 } data;
260
261 u32 seq;
262 u32 pid;
263 u32 event;
264 struct net *net;
265 };
266
267 struct xfrm_replay {
268 void (*advance)(struct xfrm_state *x, __be32 net_seq);
269 int (*check)(struct xfrm_state *x,
270 struct sk_buff *skb,
271 __be32 net_seq);
272 void (*notify)(struct xfrm_state *x, int event);
273 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
274 };
275
276 struct net_device;
277 struct xfrm_type;
278 struct xfrm_dst;
279 struct xfrm_policy_afinfo {
280 unsigned short family;
281 struct dst_ops *dst_ops;
282 void (*garbage_collect)(struct net *net);
283 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
284 const xfrm_address_t *saddr,
285 const xfrm_address_t *daddr);
286 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
287 void (*decode_session)(struct sk_buff *skb,
288 struct flowi *fl,
289 int reverse);
290 int (*get_tos)(const struct flowi *fl);
291 int (*init_path)(struct xfrm_dst *path,
292 struct dst_entry *dst,
293 int nfheader_len);
294 int (*fill_dst)(struct xfrm_dst *xdst,
295 struct net_device *dev,
296 const struct flowi *fl);
297 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
298 };
299
300 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
301 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
302 extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c);
303 extern void km_state_notify(struct xfrm_state *x, const struct km_event *c);
304
305 struct xfrm_tmpl;
306 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
307 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
308 extern int __xfrm_state_delete(struct xfrm_state *x);
309
310 struct xfrm_state_afinfo {
311 unsigned int family;
312 unsigned int proto;
313 __be16 eth_proto;
314 struct module *owner;
315 const struct xfrm_type *type_map[IPPROTO_MAX];
316 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
317 int (*init_flags)(struct xfrm_state *x);
318 void (*init_tempsel)(struct xfrm_selector *sel,
319 const struct flowi *fl);
320 void (*init_temprop)(struct xfrm_state *x,
321 const struct xfrm_tmpl *tmpl,
322 const xfrm_address_t *daddr,
323 const xfrm_address_t *saddr);
324 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
325 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
326 int (*output)(struct sk_buff *skb);
327 int (*output_finish)(struct sk_buff *skb);
328 int (*extract_input)(struct xfrm_state *x,
329 struct sk_buff *skb);
330 int (*extract_output)(struct xfrm_state *x,
331 struct sk_buff *skb);
332 int (*transport_finish)(struct sk_buff *skb,
333 int async);
334 };
335
336 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
337 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
338
339 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
340
341 struct xfrm_type {
342 char *description;
343 struct module *owner;
344 u8 proto;
345 u8 flags;
346 #define XFRM_TYPE_NON_FRAGMENT 1
347 #define XFRM_TYPE_REPLAY_PROT 2
348 #define XFRM_TYPE_LOCAL_COADDR 4
349 #define XFRM_TYPE_REMOTE_COADDR 8
350
351 int (*init_state)(struct xfrm_state *x);
352 void (*destructor)(struct xfrm_state *);
353 int (*input)(struct xfrm_state *, struct sk_buff *skb);
354 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
355 int (*reject)(struct xfrm_state *, struct sk_buff *,
356 const struct flowi *);
357 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
358 /* Estimate maximal size of result of transformation of a dgram */
359 u32 (*get_mtu)(struct xfrm_state *, int size);
360 };
361
362 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
363 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
364
365 struct xfrm_mode {
366 /*
367 * Remove encapsulation header.
368 *
369 * The IP header will be moved over the top of the encapsulation
370 * header.
371 *
372 * On entry, the transport header shall point to where the IP header
373 * should be and the network header shall be set to where the IP
374 * header currently is. skb->data shall point to the start of the
375 * payload.
376 */
377 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
378
379 /*
380 * This is the actual input entry point.
381 *
382 * For transport mode and equivalent this would be identical to
383 * input2 (which does not need to be set). While tunnel mode
384 * and equivalent would set this to the tunnel encapsulation function
385 * xfrm4_prepare_input that would in turn call input2.
386 */
387 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
388
389 /*
390 * Add encapsulation header.
391 *
392 * On exit, the transport header will be set to the start of the
393 * encapsulation header to be filled in by x->type->output and
394 * the mac header will be set to the nextheader (protocol for
395 * IPv4) field of the extension header directly preceding the
396 * encapsulation header, or in its absence, that of the top IP
397 * header. The value of the network header will always point
398 * to the top IP header while skb->data will point to the payload.
399 */
400 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
401
402 /*
403 * This is the actual output entry point.
404 *
405 * For transport mode and equivalent this would be identical to
406 * output2 (which does not need to be set). While tunnel mode
407 * and equivalent would set this to a tunnel encapsulation function
408 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
409 * call output2.
410 */
411 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
412
413 struct xfrm_state_afinfo *afinfo;
414 struct module *owner;
415 unsigned int encap;
416 int flags;
417 };
418
419 /* Flags for xfrm_mode. */
420 enum {
421 XFRM_MODE_FLAG_TUNNEL = 1,
422 };
423
424 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
425 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
426
427 static inline int xfrm_af2proto(unsigned int family)
428 {
429 switch(family) {
430 case AF_INET:
431 return IPPROTO_IPIP;
432 case AF_INET6:
433 return IPPROTO_IPV6;
434 default:
435 return 0;
436 }
437 }
438
439 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
440 {
441 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
442 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
443 return x->inner_mode;
444 else
445 return x->inner_mode_iaf;
446 }
447
448 struct xfrm_tmpl {
449 /* id in template is interpreted as:
450 * daddr - destination of tunnel, may be zero for transport mode.
451 * spi - zero to acquire spi. Not zero if spi is static, then
452 * daddr must be fixed too.
453 * proto - AH/ESP/IPCOMP
454 */
455 struct xfrm_id id;
456
457 /* Source address of tunnel. Ignored, if it is not a tunnel. */
458 xfrm_address_t saddr;
459
460 unsigned short encap_family;
461
462 u32 reqid;
463
464 /* Mode: transport, tunnel etc. */
465 u8 mode;
466
467 /* Sharing mode: unique, this session only, this user only etc. */
468 u8 share;
469
470 /* May skip this transfomration if no SA is found */
471 u8 optional;
472
473 /* Skip aalgos/ealgos/calgos checks. */
474 u8 allalgs;
475
476 /* Bit mask of algos allowed for acquisition */
477 u32 aalgos;
478 u32 ealgos;
479 u32 calgos;
480 };
481
482 #define XFRM_MAX_DEPTH 6
483
484 struct xfrm_policy_walk_entry {
485 struct list_head all;
486 u8 dead;
487 };
488
489 struct xfrm_policy_walk {
490 struct xfrm_policy_walk_entry walk;
491 u8 type;
492 u32 seq;
493 };
494
495 struct xfrm_policy {
496 #ifdef CONFIG_NET_NS
497 struct net *xp_net;
498 #endif
499 struct hlist_node bydst;
500 struct hlist_node byidx;
501
502 /* This lock only affects elements except for entry. */
503 rwlock_t lock;
504 atomic_t refcnt;
505 struct timer_list timer;
506
507 struct flow_cache_object flo;
508 atomic_t genid;
509 u32 priority;
510 u32 index;
511 struct xfrm_mark mark;
512 struct xfrm_selector selector;
513 struct xfrm_lifetime_cfg lft;
514 struct xfrm_lifetime_cur curlft;
515 struct xfrm_policy_walk_entry walk;
516 u8 type;
517 u8 action;
518 u8 flags;
519 u8 xfrm_nr;
520 u16 family;
521 struct xfrm_sec_ctx *security;
522 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
523 };
524
525 static inline struct net *xp_net(const struct xfrm_policy *xp)
526 {
527 return read_pnet(&xp->xp_net);
528 }
529
530 struct xfrm_kmaddress {
531 xfrm_address_t local;
532 xfrm_address_t remote;
533 u32 reserved;
534 u16 family;
535 };
536
537 struct xfrm_migrate {
538 xfrm_address_t old_daddr;
539 xfrm_address_t old_saddr;
540 xfrm_address_t new_daddr;
541 xfrm_address_t new_saddr;
542 u8 proto;
543 u8 mode;
544 u16 reserved;
545 u32 reqid;
546 u16 old_family;
547 u16 new_family;
548 };
549
550 #define XFRM_KM_TIMEOUT 30
551 /* which seqno */
552 #define XFRM_REPLAY_SEQ 1
553 #define XFRM_REPLAY_OSEQ 2
554 #define XFRM_REPLAY_SEQ_MASK 3
555 /* what happened */
556 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
557 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
558
559 /* default aevent timeout in units of 100ms */
560 #define XFRM_AE_ETIME 10
561 /* Async Event timer multiplier */
562 #define XFRM_AE_ETH_M 10
563 /* default seq threshold size */
564 #define XFRM_AE_SEQT_SIZE 2
565
566 struct xfrm_mgr {
567 struct list_head list;
568 char *id;
569 int (*notify)(struct xfrm_state *x, const struct km_event *c);
570 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
571 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
572 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
573 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
574 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
575 int (*migrate)(const struct xfrm_selector *sel,
576 u8 dir, u8 type,
577 const struct xfrm_migrate *m,
578 int num_bundles,
579 const struct xfrm_kmaddress *k);
580 };
581
582 extern int xfrm_register_km(struct xfrm_mgr *km);
583 extern int xfrm_unregister_km(struct xfrm_mgr *km);
584
585 /*
586 * This structure is used for the duration where packets are being
587 * transformed by IPsec. As soon as the packet leaves IPsec the
588 * area beyond the generic IP part may be overwritten.
589 */
590 struct xfrm_skb_cb {
591 union {
592 struct inet_skb_parm h4;
593 struct inet6_skb_parm h6;
594 } header;
595
596 /* Sequence number for replay protection. */
597 union {
598 struct {
599 __u32 low;
600 __u32 hi;
601 } output;
602 struct {
603 __be32 low;
604 __be32 hi;
605 } input;
606 } seq;
607 };
608
609 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
610
611 /*
612 * This structure is used by the afinfo prepare_input/prepare_output functions
613 * to transmit header information to the mode input/output functions.
614 */
615 struct xfrm_mode_skb_cb {
616 union {
617 struct inet_skb_parm h4;
618 struct inet6_skb_parm h6;
619 } header;
620
621 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
622 __be16 id;
623 __be16 frag_off;
624
625 /* IP header length (excluding options or extension headers). */
626 u8 ihl;
627
628 /* TOS for IPv4, class for IPv6. */
629 u8 tos;
630
631 /* TTL for IPv4, hop limitfor IPv6. */
632 u8 ttl;
633
634 /* Protocol for IPv4, NH for IPv6. */
635 u8 protocol;
636
637 /* Option length for IPv4, zero for IPv6. */
638 u8 optlen;
639
640 /* Used by IPv6 only, zero for IPv4. */
641 u8 flow_lbl[3];
642 };
643
644 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
645
646 /*
647 * This structure is used by the input processing to locate the SPI and
648 * related information.
649 */
650 struct xfrm_spi_skb_cb {
651 union {
652 struct inet_skb_parm h4;
653 struct inet6_skb_parm h6;
654 } header;
655
656 unsigned int daddroff;
657 unsigned int family;
658 };
659
660 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
661
662 /* Audit Information */
663 struct xfrm_audit {
664 u32 secid;
665 uid_t loginuid;
666 u32 sessionid;
667 };
668
669 #ifdef CONFIG_AUDITSYSCALL
670 static inline struct audit_buffer *xfrm_audit_start(const char *op)
671 {
672 struct audit_buffer *audit_buf = NULL;
673
674 if (audit_enabled == 0)
675 return NULL;
676 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
677 AUDIT_MAC_IPSEC_EVENT);
678 if (audit_buf == NULL)
679 return NULL;
680 audit_log_format(audit_buf, "op=%s", op);
681 return audit_buf;
682 }
683
684 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
685 struct audit_buffer *audit_buf)
686 {
687 char *secctx;
688 u32 secctx_len;
689
690 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
691 if (secid != 0 &&
692 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
693 audit_log_format(audit_buf, " subj=%s", secctx);
694 security_release_secctx(secctx, secctx_len);
695 } else
696 audit_log_task_context(audit_buf);
697 }
698
699 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
700 u32 auid, u32 ses, u32 secid);
701 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
702 u32 auid, u32 ses, u32 secid);
703 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
704 u32 auid, u32 ses, u32 secid);
705 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
706 u32 auid, u32 ses, u32 secid);
707 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
708 struct sk_buff *skb);
709 extern void xfrm_audit_state_replay(struct xfrm_state *x,
710 struct sk_buff *skb, __be32 net_seq);
711 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
712 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
713 __be32 net_spi, __be32 net_seq);
714 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
715 struct sk_buff *skb, u8 proto);
716 #else
717
718 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
719 u32 auid, u32 ses, u32 secid)
720 {
721 }
722
723 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
724 u32 auid, u32 ses, u32 secid)
725 {
726 }
727
728 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
729 u32 auid, u32 ses, u32 secid)
730 {
731 }
732
733 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
734 u32 auid, u32 ses, u32 secid)
735 {
736 }
737
738 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
739 struct sk_buff *skb)
740 {
741 }
742
743 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
744 struct sk_buff *skb, __be32 net_seq)
745 {
746 }
747
748 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
749 u16 family)
750 {
751 }
752
753 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
754 __be32 net_spi, __be32 net_seq)
755 {
756 }
757
758 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
759 struct sk_buff *skb, u8 proto)
760 {
761 }
762 #endif /* CONFIG_AUDITSYSCALL */
763
764 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
765 {
766 if (likely(policy != NULL))
767 atomic_inc(&policy->refcnt);
768 }
769
770 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
771
772 static inline void xfrm_pol_put(struct xfrm_policy *policy)
773 {
774 if (atomic_dec_and_test(&policy->refcnt))
775 xfrm_policy_destroy(policy);
776 }
777
778 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
779 {
780 int i;
781 for (i = npols - 1; i >= 0; --i)
782 xfrm_pol_put(pols[i]);
783 }
784
785 extern void __xfrm_state_destroy(struct xfrm_state *);
786
787 static inline void __xfrm_state_put(struct xfrm_state *x)
788 {
789 atomic_dec(&x->refcnt);
790 }
791
792 static inline void xfrm_state_put(struct xfrm_state *x)
793 {
794 if (atomic_dec_and_test(&x->refcnt))
795 __xfrm_state_destroy(x);
796 }
797
798 static inline void xfrm_state_hold(struct xfrm_state *x)
799 {
800 atomic_inc(&x->refcnt);
801 }
802
803 static inline bool addr_match(const void *token1, const void *token2,
804 int prefixlen)
805 {
806 const __be32 *a1 = token1;
807 const __be32 *a2 = token2;
808 int pdw;
809 int pbi;
810
811 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
812 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
813
814 if (pdw)
815 if (memcmp(a1, a2, pdw << 2))
816 return false;
817
818 if (pbi) {
819 __be32 mask;
820
821 mask = htonl((0xffffffff) << (32 - pbi));
822
823 if ((a1[pdw] ^ a2[pdw]) & mask)
824 return false;
825 }
826
827 return true;
828 }
829
830 static __inline__
831 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
832 {
833 __be16 port;
834 switch(fl->flowi_proto) {
835 case IPPROTO_TCP:
836 case IPPROTO_UDP:
837 case IPPROTO_UDPLITE:
838 case IPPROTO_SCTP:
839 port = uli->ports.sport;
840 break;
841 case IPPROTO_ICMP:
842 case IPPROTO_ICMPV6:
843 port = htons(uli->icmpt.type);
844 break;
845 case IPPROTO_MH:
846 port = htons(uli->mht.type);
847 break;
848 case IPPROTO_GRE:
849 port = htons(ntohl(uli->gre_key) >> 16);
850 break;
851 default:
852 port = 0; /*XXX*/
853 }
854 return port;
855 }
856
857 static __inline__
858 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
859 {
860 __be16 port;
861 switch(fl->flowi_proto) {
862 case IPPROTO_TCP:
863 case IPPROTO_UDP:
864 case IPPROTO_UDPLITE:
865 case IPPROTO_SCTP:
866 port = uli->ports.dport;
867 break;
868 case IPPROTO_ICMP:
869 case IPPROTO_ICMPV6:
870 port = htons(uli->icmpt.code);
871 break;
872 case IPPROTO_GRE:
873 port = htons(ntohl(uli->gre_key) & 0xffff);
874 break;
875 default:
876 port = 0; /*XXX*/
877 }
878 return port;
879 }
880
881 extern int xfrm_selector_match(const struct xfrm_selector *sel,
882 const struct flowi *fl,
883 unsigned short family);
884
885 #ifdef CONFIG_SECURITY_NETWORK_XFRM
886 /* If neither has a context --> match
887 * Otherwise, both must have a context and the sids, doi, alg must match
888 */
889 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
890 {
891 return ((!s1 && !s2) ||
892 (s1 && s2 &&
893 (s1->ctx_sid == s2->ctx_sid) &&
894 (s1->ctx_doi == s2->ctx_doi) &&
895 (s1->ctx_alg == s2->ctx_alg)));
896 }
897 #else
898 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
899 {
900 return 1;
901 }
902 #endif
903
904 /* A struct encoding bundle of transformations to apply to some set of flow.
905 *
906 * dst->child points to the next element of bundle.
907 * dst->xfrm points to an instanse of transformer.
908 *
909 * Due to unfortunate limitations of current routing cache, which we
910 * have no time to fix, it mirrors struct rtable and bound to the same
911 * routing key, including saddr,daddr. However, we can have many of
912 * bundles differing by session id. All the bundles grow from a parent
913 * policy rule.
914 */
915 struct xfrm_dst {
916 union {
917 struct dst_entry dst;
918 struct rtable rt;
919 struct rt6_info rt6;
920 } u;
921 struct dst_entry *route;
922 struct flow_cache_object flo;
923 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
924 int num_pols, num_xfrms;
925 #ifdef CONFIG_XFRM_SUB_POLICY
926 struct flowi *origin;
927 struct xfrm_selector *partner;
928 #endif
929 u32 xfrm_genid;
930 u32 policy_genid;
931 u32 route_mtu_cached;
932 u32 child_mtu_cached;
933 u32 route_cookie;
934 u32 path_cookie;
935 };
936
937 #ifdef CONFIG_XFRM
938 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
939 {
940 xfrm_pols_put(xdst->pols, xdst->num_pols);
941 dst_release(xdst->route);
942 if (likely(xdst->u.dst.xfrm))
943 xfrm_state_put(xdst->u.dst.xfrm);
944 #ifdef CONFIG_XFRM_SUB_POLICY
945 kfree(xdst->origin);
946 xdst->origin = NULL;
947 kfree(xdst->partner);
948 xdst->partner = NULL;
949 #endif
950 }
951 #endif
952
953 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
954
955 struct sec_path {
956 atomic_t refcnt;
957 int len;
958 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
959 };
960
961 static inline int secpath_exists(struct sk_buff *skb)
962 {
963 #ifdef CONFIG_XFRM
964 return skb->sp != NULL;
965 #else
966 return 0;
967 #endif
968 }
969
970 static inline struct sec_path *
971 secpath_get(struct sec_path *sp)
972 {
973 if (sp)
974 atomic_inc(&sp->refcnt);
975 return sp;
976 }
977
978 extern void __secpath_destroy(struct sec_path *sp);
979
980 static inline void
981 secpath_put(struct sec_path *sp)
982 {
983 if (sp && atomic_dec_and_test(&sp->refcnt))
984 __secpath_destroy(sp);
985 }
986
987 extern struct sec_path *secpath_dup(struct sec_path *src);
988
989 static inline void
990 secpath_reset(struct sk_buff *skb)
991 {
992 #ifdef CONFIG_XFRM
993 secpath_put(skb->sp);
994 skb->sp = NULL;
995 #endif
996 }
997
998 static inline int
999 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1000 {
1001 switch (family) {
1002 case AF_INET:
1003 return addr->a4 == 0;
1004 case AF_INET6:
1005 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1006 }
1007 return 0;
1008 }
1009
1010 static inline int
1011 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1012 {
1013 return (tmpl->saddr.a4 &&
1014 tmpl->saddr.a4 != x->props.saddr.a4);
1015 }
1016
1017 static inline int
1018 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1019 {
1020 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1021 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1022 }
1023
1024 static inline int
1025 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1026 {
1027 switch (family) {
1028 case AF_INET:
1029 return __xfrm4_state_addr_cmp(tmpl, x);
1030 case AF_INET6:
1031 return __xfrm6_state_addr_cmp(tmpl, x);
1032 }
1033 return !0;
1034 }
1035
1036 #ifdef CONFIG_XFRM
1037 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1038
1039 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1040 struct sk_buff *skb,
1041 unsigned int family, int reverse)
1042 {
1043 struct net *net = dev_net(skb->dev);
1044 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1045
1046 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1047 return __xfrm_policy_check(sk, ndir, skb, family);
1048
1049 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1050 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1051 __xfrm_policy_check(sk, ndir, skb, family);
1052 }
1053
1054 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1055 {
1056 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1057 }
1058
1059 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1060 {
1061 return xfrm_policy_check(sk, dir, skb, AF_INET);
1062 }
1063
1064 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1065 {
1066 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1067 }
1068
1069 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1070 struct sk_buff *skb)
1071 {
1072 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1073 }
1074
1075 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1076 struct sk_buff *skb)
1077 {
1078 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1079 }
1080
1081 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1082 unsigned int family, int reverse);
1083
1084 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1085 unsigned int family)
1086 {
1087 return __xfrm_decode_session(skb, fl, family, 0);
1088 }
1089
1090 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1091 struct flowi *fl,
1092 unsigned int family)
1093 {
1094 return __xfrm_decode_session(skb, fl, family, 1);
1095 }
1096
1097 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1098
1099 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1100 {
1101 struct net *net = dev_net(skb->dev);
1102
1103 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1104 (skb_dst(skb)->flags & DST_NOXFRM) ||
1105 __xfrm_route_forward(skb, family);
1106 }
1107
1108 static inline int xfrm4_route_forward(struct sk_buff *skb)
1109 {
1110 return xfrm_route_forward(skb, AF_INET);
1111 }
1112
1113 static inline int xfrm6_route_forward(struct sk_buff *skb)
1114 {
1115 return xfrm_route_forward(skb, AF_INET6);
1116 }
1117
1118 extern int __xfrm_sk_clone_policy(struct sock *sk);
1119
1120 static inline int xfrm_sk_clone_policy(struct sock *sk)
1121 {
1122 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1123 return __xfrm_sk_clone_policy(sk);
1124 return 0;
1125 }
1126
1127 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1128
1129 static inline void xfrm_sk_free_policy(struct sock *sk)
1130 {
1131 if (unlikely(sk->sk_policy[0] != NULL)) {
1132 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1133 sk->sk_policy[0] = NULL;
1134 }
1135 if (unlikely(sk->sk_policy[1] != NULL)) {
1136 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1137 sk->sk_policy[1] = NULL;
1138 }
1139 }
1140
1141 #else
1142
1143 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1144 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1145 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1146 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1147 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1148 {
1149 return 1;
1150 }
1151 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1152 {
1153 return 1;
1154 }
1155 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1156 {
1157 return 1;
1158 }
1159 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1160 struct flowi *fl,
1161 unsigned int family)
1162 {
1163 return -ENOSYS;
1164 }
1165 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1166 struct sk_buff *skb)
1167 {
1168 return 1;
1169 }
1170 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1171 struct sk_buff *skb)
1172 {
1173 return 1;
1174 }
1175 #endif
1176
1177 static __inline__
1178 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1179 {
1180 switch (family){
1181 case AF_INET:
1182 return (xfrm_address_t *)&fl->u.ip4.daddr;
1183 case AF_INET6:
1184 return (xfrm_address_t *)&fl->u.ip6.daddr;
1185 }
1186 return NULL;
1187 }
1188
1189 static __inline__
1190 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1191 {
1192 switch (family){
1193 case AF_INET:
1194 return (xfrm_address_t *)&fl->u.ip4.saddr;
1195 case AF_INET6:
1196 return (xfrm_address_t *)&fl->u.ip6.saddr;
1197 }
1198 return NULL;
1199 }
1200
1201 static __inline__
1202 void xfrm_flowi_addr_get(const struct flowi *fl,
1203 xfrm_address_t *saddr, xfrm_address_t *daddr,
1204 unsigned short family)
1205 {
1206 switch(family) {
1207 case AF_INET:
1208 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1209 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1210 break;
1211 case AF_INET6:
1212 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->u.ip6.saddr);
1213 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->u.ip6.daddr);
1214 break;
1215 }
1216 }
1217
1218 static __inline__ int
1219 __xfrm4_state_addr_check(const struct xfrm_state *x,
1220 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1221 {
1222 if (daddr->a4 == x->id.daddr.a4 &&
1223 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1224 return 1;
1225 return 0;
1226 }
1227
1228 static __inline__ int
1229 __xfrm6_state_addr_check(const struct xfrm_state *x,
1230 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1231 {
1232 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1233 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1234 ipv6_addr_any((struct in6_addr *)saddr) ||
1235 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1236 return 1;
1237 return 0;
1238 }
1239
1240 static __inline__ int
1241 xfrm_state_addr_check(const struct xfrm_state *x,
1242 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1243 unsigned short family)
1244 {
1245 switch (family) {
1246 case AF_INET:
1247 return __xfrm4_state_addr_check(x, daddr, saddr);
1248 case AF_INET6:
1249 return __xfrm6_state_addr_check(x, daddr, saddr);
1250 }
1251 return 0;
1252 }
1253
1254 static __inline__ int
1255 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1256 unsigned short family)
1257 {
1258 switch (family) {
1259 case AF_INET:
1260 return __xfrm4_state_addr_check(x,
1261 (const xfrm_address_t *)&fl->u.ip4.daddr,
1262 (const xfrm_address_t *)&fl->u.ip4.saddr);
1263 case AF_INET6:
1264 return __xfrm6_state_addr_check(x,
1265 (const xfrm_address_t *)&fl->u.ip6.daddr,
1266 (const xfrm_address_t *)&fl->u.ip6.saddr);
1267 }
1268 return 0;
1269 }
1270
1271 static inline int xfrm_state_kern(const struct xfrm_state *x)
1272 {
1273 return atomic_read(&x->tunnel_users);
1274 }
1275
1276 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1277 {
1278 return (!userproto || proto == userproto ||
1279 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1280 proto == IPPROTO_ESP ||
1281 proto == IPPROTO_COMP)));
1282 }
1283
1284 /*
1285 * xfrm algorithm information
1286 */
1287 struct xfrm_algo_aead_info {
1288 u16 icv_truncbits;
1289 };
1290
1291 struct xfrm_algo_auth_info {
1292 u16 icv_truncbits;
1293 u16 icv_fullbits;
1294 };
1295
1296 struct xfrm_algo_encr_info {
1297 u16 blockbits;
1298 u16 defkeybits;
1299 };
1300
1301 struct xfrm_algo_comp_info {
1302 u16 threshold;
1303 };
1304
1305 struct xfrm_algo_desc {
1306 char *name;
1307 char *compat;
1308 u8 available:1;
1309 union {
1310 struct xfrm_algo_aead_info aead;
1311 struct xfrm_algo_auth_info auth;
1312 struct xfrm_algo_encr_info encr;
1313 struct xfrm_algo_comp_info comp;
1314 } uinfo;
1315 struct sadb_alg desc;
1316 };
1317
1318 /* XFRM tunnel handlers. */
1319 struct xfrm_tunnel {
1320 int (*handler)(struct sk_buff *skb);
1321 int (*err_handler)(struct sk_buff *skb, u32 info);
1322
1323 struct xfrm_tunnel __rcu *next;
1324 int priority;
1325 };
1326
1327 struct xfrm6_tunnel {
1328 int (*handler)(struct sk_buff *skb);
1329 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1330 u8 type, u8 code, int offset, __be32 info);
1331 struct xfrm6_tunnel __rcu *next;
1332 int priority;
1333 };
1334
1335 extern void xfrm_init(void);
1336 extern void xfrm4_init(int rt_hash_size);
1337 extern int xfrm_state_init(struct net *net);
1338 extern void xfrm_state_fini(struct net *net);
1339 extern void xfrm4_state_init(void);
1340 #ifdef CONFIG_XFRM
1341 extern int xfrm6_init(void);
1342 extern void xfrm6_fini(void);
1343 extern int xfrm6_state_init(void);
1344 extern void xfrm6_state_fini(void);
1345 #else
1346 static inline int xfrm6_init(void)
1347 {
1348 return 0;
1349 }
1350 static inline void xfrm6_fini(void)
1351 {
1352 ;
1353 }
1354 #endif
1355
1356 #ifdef CONFIG_XFRM_STATISTICS
1357 extern int xfrm_proc_init(struct net *net);
1358 extern void xfrm_proc_fini(struct net *net);
1359 #endif
1360
1361 extern int xfrm_sysctl_init(struct net *net);
1362 #ifdef CONFIG_SYSCTL
1363 extern void xfrm_sysctl_fini(struct net *net);
1364 #else
1365 static inline void xfrm_sysctl_fini(struct net *net)
1366 {
1367 }
1368 #endif
1369
1370 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1371 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1372 int (*func)(struct xfrm_state *, int, void*), void *);
1373 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1374 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1375 extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1376 const xfrm_address_t *saddr,
1377 const struct flowi *fl,
1378 struct xfrm_tmpl *tmpl,
1379 struct xfrm_policy *pol, int *err,
1380 unsigned short family);
1381 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1382 xfrm_address_t *daddr,
1383 xfrm_address_t *saddr,
1384 unsigned short family,
1385 u8 mode, u8 proto, u32 reqid);
1386 extern int xfrm_state_check_expire(struct xfrm_state *x);
1387 extern void xfrm_state_insert(struct xfrm_state *x);
1388 extern int xfrm_state_add(struct xfrm_state *x);
1389 extern int xfrm_state_update(struct xfrm_state *x);
1390 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1391 const xfrm_address_t *daddr, __be32 spi,
1392 u8 proto, unsigned short family);
1393 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1394 const xfrm_address_t *daddr,
1395 const xfrm_address_t *saddr,
1396 u8 proto,
1397 unsigned short family);
1398 #ifdef CONFIG_XFRM_SUB_POLICY
1399 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1400 int n, unsigned short family);
1401 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1402 int n, unsigned short family);
1403 #else
1404 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1405 int n, unsigned short family)
1406 {
1407 return -ENOSYS;
1408 }
1409
1410 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1411 int n, unsigned short family)
1412 {
1413 return -ENOSYS;
1414 }
1415 #endif
1416
1417 struct xfrmk_sadinfo {
1418 u32 sadhcnt; /* current hash bkts */
1419 u32 sadhmcnt; /* max allowed hash bkts */
1420 u32 sadcnt; /* current running count */
1421 };
1422
1423 struct xfrmk_spdinfo {
1424 u32 incnt;
1425 u32 outcnt;
1426 u32 fwdcnt;
1427 u32 inscnt;
1428 u32 outscnt;
1429 u32 fwdscnt;
1430 u32 spdhcnt;
1431 u32 spdhmcnt;
1432 };
1433
1434 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1435 u32 seq);
1436 extern int xfrm_state_delete(struct xfrm_state *x);
1437 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1438 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1439 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1440 extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1441 extern int xfrm_init_replay(struct xfrm_state *x);
1442 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1443 extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1444 extern int xfrm_init_state(struct xfrm_state *x);
1445 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1446 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1447 int encap_type);
1448 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1449 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1450 extern int xfrm_output(struct sk_buff *skb);
1451 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1452 extern int xfrm4_extract_header(struct sk_buff *skb);
1453 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1454 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1455 int encap_type);
1456 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1457 extern int xfrm4_rcv(struct sk_buff *skb);
1458
1459 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1460 {
1461 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1462 }
1463
1464 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1465 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1466 extern int xfrm4_output(struct sk_buff *skb);
1467 extern int xfrm4_output_finish(struct sk_buff *skb);
1468 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1469 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1470 extern int xfrm6_extract_header(struct sk_buff *skb);
1471 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1472 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1473 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1474 extern int xfrm6_rcv(struct sk_buff *skb);
1475 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1476 xfrm_address_t *saddr, u8 proto);
1477 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1478 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1479 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1480 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1481 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1482 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1483 extern int xfrm6_output(struct sk_buff *skb);
1484 extern int xfrm6_output_finish(struct sk_buff *skb);
1485 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1486 u8 **prevhdr);
1487
1488 #ifdef CONFIG_XFRM
1489 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1490 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1491 #else
1492 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1493 {
1494 return -ENOPROTOOPT;
1495 }
1496
1497 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1498 {
1499 /* should not happen */
1500 kfree_skb(skb);
1501 return 0;
1502 }
1503 #endif
1504
1505 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1506
1507 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1508 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1509 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1510 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1511 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1512 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1513 u8 type, int dir,
1514 struct xfrm_selector *sel,
1515 struct xfrm_sec_ctx *ctx, int delete,
1516 int *err);
1517 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1518 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1519 u32 xfrm_get_acqseq(void);
1520 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1521 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1522 u8 mode, u32 reqid, u8 proto,
1523 const xfrm_address_t *daddr,
1524 const xfrm_address_t *saddr, int create,
1525 unsigned short family);
1526 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1527
1528 #ifdef CONFIG_XFRM_MIGRATE
1529 extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1530 const struct xfrm_migrate *m, int num_bundles,
1531 const struct xfrm_kmaddress *k);
1532 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1533 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1534 struct xfrm_migrate *m);
1535 extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1536 struct xfrm_migrate *m, int num_bundles,
1537 struct xfrm_kmaddress *k);
1538 #endif
1539
1540 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1541 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1542 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1543
1544 extern void xfrm_input_init(void);
1545 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1546
1547 extern void xfrm_probe_algs(void);
1548 extern int xfrm_count_auth_supported(void);
1549 extern int xfrm_count_enc_supported(void);
1550 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1551 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1552 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1553 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1554 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1555 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1556 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1557 extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1558 extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1559 int probe);
1560
1561 struct hash_desc;
1562 struct scatterlist;
1563 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1564 unsigned int);
1565
1566 static inline int xfrm_addr_cmp(const xfrm_address_t *a,
1567 const xfrm_address_t *b,
1568 int family)
1569 {
1570 switch (family) {
1571 default:
1572 case AF_INET:
1573 return (__force u32)a->a4 - (__force u32)b->a4;
1574 case AF_INET6:
1575 return ipv6_addr_cmp((const struct in6_addr *)a,
1576 (const struct in6_addr *)b);
1577 }
1578 }
1579
1580 static inline int xfrm_policy_id2dir(u32 index)
1581 {
1582 return index & 7;
1583 }
1584
1585 #ifdef CONFIG_XFRM
1586 static inline int xfrm_aevent_is_on(struct net *net)
1587 {
1588 struct sock *nlsk;
1589 int ret = 0;
1590
1591 rcu_read_lock();
1592 nlsk = rcu_dereference(net->xfrm.nlsk);
1593 if (nlsk)
1594 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1595 rcu_read_unlock();
1596 return ret;
1597 }
1598 #endif
1599
1600 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1601 {
1602 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1603 }
1604
1605 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1606 {
1607 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1608 }
1609
1610 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1611 {
1612 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1613 }
1614
1615 #ifdef CONFIG_XFRM_MIGRATE
1616 static inline int xfrm_replay_clone(struct xfrm_state *x,
1617 struct xfrm_state *orig)
1618 {
1619 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1620 GFP_KERNEL);
1621 if (!x->replay_esn)
1622 return -ENOMEM;
1623
1624 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1625 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1626
1627 x->preplay_esn = kmemdup(x->replay_esn,
1628 xfrm_replay_state_esn_len(x->replay_esn),
1629 GFP_KERNEL);
1630 if (!x->preplay_esn) {
1631 kfree(x->replay_esn);
1632 return -ENOMEM;
1633 }
1634
1635 return 0;
1636 }
1637
1638 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1639 {
1640 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1641 }
1642
1643 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1644 {
1645 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1646 }
1647
1648 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1649 {
1650 int i;
1651 for (i = 0; i < n; i++)
1652 xfrm_state_put(*(states + i));
1653 }
1654
1655 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1656 {
1657 int i;
1658 for (i = 0; i < n; i++)
1659 xfrm_state_delete(*(states + i));
1660 }
1661 #endif
1662
1663 #ifdef CONFIG_XFRM
1664 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1665 {
1666 return skb->sp->xvec[skb->sp->len - 1];
1667 }
1668 #endif
1669
1670 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1671 {
1672 if (attrs[XFRMA_MARK])
1673 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1674 else
1675 m->v = m->m = 0;
1676
1677 return m->v & m->m;
1678 }
1679
1680 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1681 {
1682 if (m->m | m->v)
1683 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1684 return 0;
1685
1686 nla_put_failure:
1687 return -1;
1688 }
1689
1690 #endif /* _NET_XFRM_H */
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