xref: /openbmc/linux/include/net/xfrm.h (revision c21b37f6)
1 #ifndef _NET_XFRM_H
2 #define _NET_XFRM_H
3 
4 #include <linux/compiler.h>
5 #include <linux/in.h>
6 #include <linux/xfrm.h>
7 #include <linux/spinlock.h>
8 #include <linux/list.h>
9 #include <linux/skbuff.h>
10 #include <linux/socket.h>
11 #include <linux/pfkeyv2.h>
12 #include <linux/ipsec.h>
13 #include <linux/in6.h>
14 #include <linux/mutex.h>
15 
16 #include <net/sock.h>
17 #include <net/dst.h>
18 #include <net/route.h>
19 #include <net/ipv6.h>
20 #include <net/ip6_fib.h>
21 
22 #define XFRM_PROTO_ESP		50
23 #define XFRM_PROTO_AH		51
24 #define XFRM_PROTO_COMP		108
25 #define XFRM_PROTO_IPIP		4
26 #define XFRM_PROTO_IPV6		41
27 #define XFRM_PROTO_ROUTING	IPPROTO_ROUTING
28 #define XFRM_PROTO_DSTOPTS	IPPROTO_DSTOPTS
29 
30 #define XFRM_ALIGN8(len)	(((len) + 7) & ~7)
31 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
32 	MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
33 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
34 	MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
35 
36 extern struct sock *xfrm_nl;
37 extern u32 sysctl_xfrm_aevent_etime;
38 extern u32 sysctl_xfrm_aevent_rseqth;
39 
40 extern struct mutex xfrm_cfg_mutex;
41 
42 /* Organization of SPD aka "XFRM rules"
43    ------------------------------------
44 
45    Basic objects:
46    - policy rule, struct xfrm_policy (=SPD entry)
47    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
48    - instance of a transformer, struct xfrm_state (=SA)
49    - template to clone xfrm_state, struct xfrm_tmpl
50 
51    SPD is plain linear list of xfrm_policy rules, ordered by priority.
52    (To be compatible with existing pfkeyv2 implementations,
53    many rules with priority of 0x7fffffff are allowed to exist and
54    such rules are ordered in an unpredictable way, thanks to bsd folks.)
55 
56    Lookup is plain linear search until the first match with selector.
57 
58    If "action" is "block", then we prohibit the flow, otherwise:
59    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
60    policy entry has list of up to XFRM_MAX_DEPTH transformations,
61    described by templates xfrm_tmpl. Each template is resolved
62    to a complete xfrm_state (see below) and we pack bundle of transformations
63    to a dst_entry returned to requestor.
64 
65    dst -. xfrm  .-> xfrm_state #1
66     |---. child .-> dst -. xfrm .-> xfrm_state #2
67                      |---. child .-> dst -. xfrm .-> xfrm_state #3
68                                       |---. child .-> NULL
69 
70    Bundles are cached at xrfm_policy struct (field ->bundles).
71 
72 
73    Resolution of xrfm_tmpl
74    -----------------------
75    Template contains:
76    1. ->mode		Mode: transport or tunnel
77    2. ->id.proto	Protocol: AH/ESP/IPCOMP
78    3. ->id.daddr	Remote tunnel endpoint, ignored for transport mode.
79       Q: allow to resolve security gateway?
80    4. ->id.spi          If not zero, static SPI.
81    5. ->saddr		Local tunnel endpoint, ignored for transport mode.
82    6. ->algos		List of allowed algos. Plain bitmask now.
83       Q: ealgos, aalgos, calgos. What a mess...
84    7. ->share		Sharing mode.
85       Q: how to implement private sharing mode? To add struct sock* to
86       flow id?
87 
88    Having this template we search through SAD searching for entries
89    with appropriate mode/proto/algo, permitted by selector.
90    If no appropriate entry found, it is requested from key manager.
91 
92    PROBLEMS:
93    Q: How to find all the bundles referring to a physical path for
94       PMTU discovery? Seems, dst should contain list of all parents...
95       and enter to infinite locking hierarchy disaster.
96       No! It is easier, we will not search for them, let them find us.
97       We add genid to each dst plus pointer to genid of raw IP route,
98       pmtu disc will update pmtu on raw IP route and increase its genid.
99       dst_check() will see this for top level and trigger resyncing
100       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
101  */
102 
103 /* Full description of state of transformer. */
104 struct xfrm_state
105 {
106 	/* Note: bydst is re-used during gc */
107 	struct hlist_node	bydst;
108 	struct hlist_node	bysrc;
109 	struct hlist_node	byspi;
110 
111 	atomic_t		refcnt;
112 	spinlock_t		lock;
113 
114 	struct xfrm_id		id;
115 	struct xfrm_selector	sel;
116 
117 	u32			genid;
118 
119 	/* Key manger bits */
120 	struct {
121 		u8		state;
122 		u8		dying;
123 		u32		seq;
124 	} km;
125 
126 	/* Parameters of this state. */
127 	struct {
128 		u32		reqid;
129 		u8		mode;
130 		u8		replay_window;
131 		u8		aalgo, ealgo, calgo;
132 		u8		flags;
133 		u16		family;
134 		xfrm_address_t	saddr;
135 		int		header_len;
136 		int		trailer_len;
137 	} props;
138 
139 	struct xfrm_lifetime_cfg lft;
140 
141 	/* Data for transformer */
142 	struct xfrm_algo	*aalg;
143 	struct xfrm_algo	*ealg;
144 	struct xfrm_algo	*calg;
145 
146 	/* Data for encapsulator */
147 	struct xfrm_encap_tmpl	*encap;
148 
149 	/* Data for care-of address */
150 	xfrm_address_t	*coaddr;
151 
152 	/* IPComp needs an IPIP tunnel for handling uncompressed packets */
153 	struct xfrm_state	*tunnel;
154 
155 	/* If a tunnel, number of users + 1 */
156 	atomic_t		tunnel_users;
157 
158 	/* State for replay detection */
159 	struct xfrm_replay_state replay;
160 
161 	/* Replay detection state at the time we sent the last notification */
162 	struct xfrm_replay_state preplay;
163 
164 	/* internal flag that only holds state for delayed aevent at the
165 	 * moment
166 	*/
167 	u32			xflags;
168 
169 	/* Replay detection notification settings */
170 	u32			replay_maxage;
171 	u32			replay_maxdiff;
172 
173 	/* Replay detection notification timer */
174 	struct timer_list	rtimer;
175 
176 	/* Statistics */
177 	struct xfrm_stats	stats;
178 
179 	struct xfrm_lifetime_cur curlft;
180 	struct timer_list	timer;
181 
182 	/* Last used time */
183 	u64			lastused;
184 
185 	/* Reference to data common to all the instances of this
186 	 * transformer. */
187 	struct xfrm_type	*type;
188 	struct xfrm_mode	*mode;
189 
190 	/* Security context */
191 	struct xfrm_sec_ctx	*security;
192 
193 	/* Private data of this transformer, format is opaque,
194 	 * interpreted by xfrm_type methods. */
195 	void			*data;
196 };
197 
198 /* xflags - make enum if more show up */
199 #define XFRM_TIME_DEFER	1
200 
201 enum {
202 	XFRM_STATE_VOID,
203 	XFRM_STATE_ACQ,
204 	XFRM_STATE_VALID,
205 	XFRM_STATE_ERROR,
206 	XFRM_STATE_EXPIRED,
207 	XFRM_STATE_DEAD
208 };
209 
210 /* callback structure passed from either netlink or pfkey */
211 struct km_event
212 {
213 	union {
214 		u32 hard;
215 		u32 proto;
216 		u32 byid;
217 		u32 aevent;
218 		u32 type;
219 	} data;
220 
221 	u32	seq;
222 	u32	pid;
223 	u32	event;
224 };
225 
226 struct xfrm_type;
227 struct xfrm_dst;
228 struct xfrm_policy_afinfo {
229 	unsigned short		family;
230 	struct xfrm_type	*type_map[IPPROTO_MAX];
231 	struct xfrm_mode	*mode_map[XFRM_MODE_MAX];
232 	struct dst_ops		*dst_ops;
233 	void			(*garbage_collect)(void);
234 	int			(*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
235 	int			(*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
236 	struct dst_entry	*(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
237 	int			(*bundle_create)(struct xfrm_policy *policy,
238 						 struct xfrm_state **xfrm,
239 						 int nx,
240 						 struct flowi *fl,
241 						 struct dst_entry **dst_p);
242 	void			(*decode_session)(struct sk_buff *skb,
243 						  struct flowi *fl);
244 };
245 
246 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
247 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
248 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
249 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
250 
251 struct xfrm_tmpl;
252 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
253 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
254 extern int __xfrm_state_delete(struct xfrm_state *x);
255 
256 struct xfrm_state_afinfo {
257 	unsigned short		family;
258 	int			(*init_flags)(struct xfrm_state *x);
259 	void			(*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
260 						struct xfrm_tmpl *tmpl,
261 						xfrm_address_t *daddr, xfrm_address_t *saddr);
262 	int			(*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
263 	int			(*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
264 	int			(*output)(struct sk_buff *skb);
265 };
266 
267 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
268 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
269 extern struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family);
270 extern void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
271 
272 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
273 
274 struct xfrm_type
275 {
276 	char			*description;
277 	struct module		*owner;
278 	__u8			proto;
279 	__u8			flags;
280 #define XFRM_TYPE_NON_FRAGMENT	1
281 
282 	int			(*init_state)(struct xfrm_state *x);
283 	void			(*destructor)(struct xfrm_state *);
284 	int			(*input)(struct xfrm_state *, struct sk_buff *skb);
285 	int			(*output)(struct xfrm_state *, struct sk_buff *pskb);
286 	int			(*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
287 	int			(*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
288 	xfrm_address_t		*(*local_addr)(struct xfrm_state *, xfrm_address_t *);
289 	xfrm_address_t		*(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
290 	/* Estimate maximal size of result of transformation of a dgram */
291 	u32			(*get_mtu)(struct xfrm_state *, int size);
292 };
293 
294 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
295 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
296 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
297 extern void xfrm_put_type(struct xfrm_type *type);
298 
299 struct xfrm_mode {
300 	int (*input)(struct xfrm_state *x, struct sk_buff *skb);
301 	int (*output)(struct xfrm_state *x,struct sk_buff *skb);
302 
303 	struct module *owner;
304 	unsigned int encap;
305 };
306 
307 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
308 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
309 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
310 extern void xfrm_put_mode(struct xfrm_mode *mode);
311 
312 struct xfrm_tmpl
313 {
314 /* id in template is interpreted as:
315  * daddr - destination of tunnel, may be zero for transport mode.
316  * spi   - zero to acquire spi. Not zero if spi is static, then
317  *	   daddr must be fixed too.
318  * proto - AH/ESP/IPCOMP
319  */
320 	struct xfrm_id		id;
321 
322 /* Source address of tunnel. Ignored, if it is not a tunnel. */
323 	xfrm_address_t		saddr;
324 
325 	unsigned short		encap_family;
326 
327 	__u32			reqid;
328 
329 /* Mode: transport, tunnel etc. */
330 	__u8			mode;
331 
332 /* Sharing mode: unique, this session only, this user only etc. */
333 	__u8			share;
334 
335 /* May skip this transfomration if no SA is found */
336 	__u8			optional;
337 
338 /* Bit mask of algos allowed for acquisition */
339 	__u32			aalgos;
340 	__u32			ealgos;
341 	__u32			calgos;
342 };
343 
344 #define XFRM_MAX_DEPTH		6
345 
346 struct xfrm_policy
347 {
348 	struct xfrm_policy	*next;
349 	struct hlist_node	bydst;
350 	struct hlist_node	byidx;
351 
352 	/* This lock only affects elements except for entry. */
353 	rwlock_t		lock;
354 	atomic_t		refcnt;
355 	struct timer_list	timer;
356 
357 	u32			priority;
358 	u32			index;
359 	struct xfrm_selector	selector;
360 	struct xfrm_lifetime_cfg lft;
361 	struct xfrm_lifetime_cur curlft;
362 	struct dst_entry       *bundles;
363 	u16			family;
364 	u8			type;
365 	u8			action;
366 	u8			flags;
367 	u8			dead;
368 	u8			xfrm_nr;
369 	/* XXX 1 byte hole, try to pack */
370 	struct xfrm_sec_ctx	*security;
371 	struct xfrm_tmpl       	xfrm_vec[XFRM_MAX_DEPTH];
372 };
373 
374 struct xfrm_migrate {
375 	xfrm_address_t		old_daddr;
376 	xfrm_address_t		old_saddr;
377 	xfrm_address_t		new_daddr;
378 	xfrm_address_t		new_saddr;
379 	u8			proto;
380 	u8			mode;
381 	u16			reserved;
382 	u32			reqid;
383 	u16			old_family;
384 	u16			new_family;
385 };
386 
387 #define XFRM_KM_TIMEOUT                30
388 /* which seqno */
389 #define XFRM_REPLAY_SEQ		1
390 #define XFRM_REPLAY_OSEQ	2
391 #define XFRM_REPLAY_SEQ_MASK	3
392 /* what happened */
393 #define XFRM_REPLAY_UPDATE	XFRM_AE_CR
394 #define XFRM_REPLAY_TIMEOUT	XFRM_AE_CE
395 
396 /* default aevent timeout in units of 100ms */
397 #define XFRM_AE_ETIME			10
398 /* Async Event timer multiplier */
399 #define XFRM_AE_ETH_M			10
400 /* default seq threshold size */
401 #define XFRM_AE_SEQT_SIZE		2
402 
403 struct xfrm_mgr
404 {
405 	struct list_head	list;
406 	char			*id;
407 	int			(*notify)(struct xfrm_state *x, struct km_event *c);
408 	int			(*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
409 	struct xfrm_policy	*(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
410 	int			(*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
411 	int			(*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
412 	int			(*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
413 	int			(*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
414 };
415 
416 extern int xfrm_register_km(struct xfrm_mgr *km);
417 extern int xfrm_unregister_km(struct xfrm_mgr *km);
418 
419 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
420 
421 /* Audit Information */
422 struct xfrm_audit
423 {
424 	uid_t	loginuid;
425 	u32	secid;
426 };
427 
428 #ifdef CONFIG_AUDITSYSCALL
429 extern void xfrm_audit_log(uid_t auid, u32 secid, int type, int result,
430 		    struct xfrm_policy *xp, struct xfrm_state *x);
431 #else
432 #define xfrm_audit_log(a,s,t,r,p,x) do { ; } while (0)
433 #endif /* CONFIG_AUDITSYSCALL */
434 
435 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
436 {
437 	if (likely(policy != NULL))
438 		atomic_inc(&policy->refcnt);
439 }
440 
441 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
442 
443 static inline void xfrm_pol_put(struct xfrm_policy *policy)
444 {
445 	if (atomic_dec_and_test(&policy->refcnt))
446 		__xfrm_policy_destroy(policy);
447 }
448 
449 #ifdef CONFIG_XFRM_SUB_POLICY
450 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
451 {
452 	int i;
453 	for (i = npols - 1; i >= 0; --i)
454 		xfrm_pol_put(pols[i]);
455 }
456 #else
457 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
458 {
459 	xfrm_pol_put(pols[0]);
460 }
461 #endif
462 
463 extern void __xfrm_state_destroy(struct xfrm_state *);
464 
465 static inline void __xfrm_state_put(struct xfrm_state *x)
466 {
467 	atomic_dec(&x->refcnt);
468 }
469 
470 static inline void xfrm_state_put(struct xfrm_state *x)
471 {
472 	if (atomic_dec_and_test(&x->refcnt))
473 		__xfrm_state_destroy(x);
474 }
475 
476 static inline void xfrm_state_hold(struct xfrm_state *x)
477 {
478 	atomic_inc(&x->refcnt);
479 }
480 
481 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
482 {
483 	__be32 *a1 = token1;
484 	__be32 *a2 = token2;
485 	int pdw;
486 	int pbi;
487 
488 	pdw = prefixlen >> 5;	  /* num of whole __u32 in prefix */
489 	pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
490 
491 	if (pdw)
492 		if (memcmp(a1, a2, pdw << 2))
493 			return 0;
494 
495 	if (pbi) {
496 		__be32 mask;
497 
498 		mask = htonl((0xffffffff) << (32 - pbi));
499 
500 		if ((a1[pdw] ^ a2[pdw]) & mask)
501 			return 0;
502 	}
503 
504 	return 1;
505 }
506 
507 static __inline__
508 __be16 xfrm_flowi_sport(struct flowi *fl)
509 {
510 	__be16 port;
511 	switch(fl->proto) {
512 	case IPPROTO_TCP:
513 	case IPPROTO_UDP:
514 	case IPPROTO_UDPLITE:
515 	case IPPROTO_SCTP:
516 		port = fl->fl_ip_sport;
517 		break;
518 	case IPPROTO_ICMP:
519 	case IPPROTO_ICMPV6:
520 		port = htons(fl->fl_icmp_type);
521 		break;
522 	case IPPROTO_MH:
523 		port = htons(fl->fl_mh_type);
524 		break;
525 	default:
526 		port = 0;	/*XXX*/
527 	}
528 	return port;
529 }
530 
531 static __inline__
532 __be16 xfrm_flowi_dport(struct flowi *fl)
533 {
534 	__be16 port;
535 	switch(fl->proto) {
536 	case IPPROTO_TCP:
537 	case IPPROTO_UDP:
538 	case IPPROTO_UDPLITE:
539 	case IPPROTO_SCTP:
540 		port = fl->fl_ip_dport;
541 		break;
542 	case IPPROTO_ICMP:
543 	case IPPROTO_ICMPV6:
544 		port = htons(fl->fl_icmp_code);
545 		break;
546 	default:
547 		port = 0;	/*XXX*/
548 	}
549 	return port;
550 }
551 
552 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
553 			       unsigned short family);
554 
555 #ifdef CONFIG_SECURITY_NETWORK_XFRM
556 /*	If neither has a context --> match
557  * 	Otherwise, both must have a context and the sids, doi, alg must match
558  */
559 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
560 {
561 	return ((!s1 && !s2) ||
562 		(s1 && s2 &&
563 		 (s1->ctx_sid == s2->ctx_sid) &&
564 		 (s1->ctx_doi == s2->ctx_doi) &&
565 		 (s1->ctx_alg == s2->ctx_alg)));
566 }
567 #else
568 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
569 {
570 	return 1;
571 }
572 #endif
573 
574 /* A struct encoding bundle of transformations to apply to some set of flow.
575  *
576  * dst->child points to the next element of bundle.
577  * dst->xfrm  points to an instanse of transformer.
578  *
579  * Due to unfortunate limitations of current routing cache, which we
580  * have no time to fix, it mirrors struct rtable and bound to the same
581  * routing key, including saddr,daddr. However, we can have many of
582  * bundles differing by session id. All the bundles grow from a parent
583  * policy rule.
584  */
585 struct xfrm_dst
586 {
587 	union {
588 		struct dst_entry	dst;
589 		struct rtable		rt;
590 		struct rt6_info		rt6;
591 	} u;
592 	struct dst_entry *route;
593 #ifdef CONFIG_XFRM_SUB_POLICY
594 	struct flowi *origin;
595 	struct xfrm_selector *partner;
596 #endif
597 	u32 genid;
598 	u32 route_mtu_cached;
599 	u32 child_mtu_cached;
600 	u32 route_cookie;
601 	u32 path_cookie;
602 };
603 
604 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
605 {
606 	dst_release(xdst->route);
607 	if (likely(xdst->u.dst.xfrm))
608 		xfrm_state_put(xdst->u.dst.xfrm);
609 #ifdef CONFIG_XFRM_SUB_POLICY
610 	kfree(xdst->origin);
611 	xdst->origin = NULL;
612 	kfree(xdst->partner);
613 	xdst->partner = NULL;
614 #endif
615 }
616 
617 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
618 
619 struct sec_path
620 {
621 	atomic_t		refcnt;
622 	int			len;
623 	struct xfrm_state	*xvec[XFRM_MAX_DEPTH];
624 };
625 
626 static inline struct sec_path *
627 secpath_get(struct sec_path *sp)
628 {
629 	if (sp)
630 		atomic_inc(&sp->refcnt);
631 	return sp;
632 }
633 
634 extern void __secpath_destroy(struct sec_path *sp);
635 
636 static inline void
637 secpath_put(struct sec_path *sp)
638 {
639 	if (sp && atomic_dec_and_test(&sp->refcnt))
640 		__secpath_destroy(sp);
641 }
642 
643 extern struct sec_path *secpath_dup(struct sec_path *src);
644 
645 static inline void
646 secpath_reset(struct sk_buff *skb)
647 {
648 #ifdef CONFIG_XFRM
649 	secpath_put(skb->sp);
650 	skb->sp = NULL;
651 #endif
652 }
653 
654 static inline int
655 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
656 {
657 	switch (family) {
658 	case AF_INET:
659 		return addr->a4 == 0;
660 	case AF_INET6:
661 		return ipv6_addr_any((struct in6_addr *)&addr->a6);
662 	}
663 	return 0;
664 }
665 
666 static inline int
667 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
668 {
669 	return	(tmpl->saddr.a4 &&
670 		 tmpl->saddr.a4 != x->props.saddr.a4);
671 }
672 
673 static inline int
674 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
675 {
676 	return	(!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
677 		 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
678 }
679 
680 static inline int
681 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
682 {
683 	switch (family) {
684 	case AF_INET:
685 		return __xfrm4_state_addr_cmp(tmpl, x);
686 	case AF_INET6:
687 		return __xfrm6_state_addr_cmp(tmpl, x);
688 	}
689 	return !0;
690 }
691 
692 #ifdef CONFIG_XFRM
693 
694 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
695 
696 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
697 {
698 	if (sk && sk->sk_policy[XFRM_POLICY_IN])
699 		return __xfrm_policy_check(sk, dir, skb, family);
700 
701 	return	(!xfrm_policy_count[dir] && !skb->sp) ||
702 		(skb->dst->flags & DST_NOPOLICY) ||
703 		__xfrm_policy_check(sk, dir, skb, family);
704 }
705 
706 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
707 {
708 	return xfrm_policy_check(sk, dir, skb, AF_INET);
709 }
710 
711 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
712 {
713 	return xfrm_policy_check(sk, dir, skb, AF_INET6);
714 }
715 
716 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
717 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
718 
719 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
720 {
721 	return	!xfrm_policy_count[XFRM_POLICY_OUT] ||
722 		(skb->dst->flags & DST_NOXFRM) ||
723 		__xfrm_route_forward(skb, family);
724 }
725 
726 static inline int xfrm4_route_forward(struct sk_buff *skb)
727 {
728 	return xfrm_route_forward(skb, AF_INET);
729 }
730 
731 static inline int xfrm6_route_forward(struct sk_buff *skb)
732 {
733 	return xfrm_route_forward(skb, AF_INET6);
734 }
735 
736 extern int __xfrm_sk_clone_policy(struct sock *sk);
737 
738 static inline int xfrm_sk_clone_policy(struct sock *sk)
739 {
740 	if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
741 		return __xfrm_sk_clone_policy(sk);
742 	return 0;
743 }
744 
745 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
746 
747 static inline void xfrm_sk_free_policy(struct sock *sk)
748 {
749 	if (unlikely(sk->sk_policy[0] != NULL)) {
750 		xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
751 		sk->sk_policy[0] = NULL;
752 	}
753 	if (unlikely(sk->sk_policy[1] != NULL)) {
754 		xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
755 		sk->sk_policy[1] = NULL;
756 	}
757 }
758 
759 #else
760 
761 static inline void xfrm_sk_free_policy(struct sock *sk) {}
762 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
763 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
764 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
765 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
766 {
767 	return 1;
768 }
769 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
770 {
771 	return 1;
772 }
773 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
774 {
775 	return 1;
776 }
777 #endif
778 
779 static __inline__
780 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
781 {
782 	switch (family){
783 	case AF_INET:
784 		return (xfrm_address_t *)&fl->fl4_dst;
785 	case AF_INET6:
786 		return (xfrm_address_t *)&fl->fl6_dst;
787 	}
788 	return NULL;
789 }
790 
791 static __inline__
792 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
793 {
794 	switch (family){
795 	case AF_INET:
796 		return (xfrm_address_t *)&fl->fl4_src;
797 	case AF_INET6:
798 		return (xfrm_address_t *)&fl->fl6_src;
799 	}
800 	return NULL;
801 }
802 
803 static __inline__ int
804 __xfrm4_state_addr_check(struct xfrm_state *x,
805 			 xfrm_address_t *daddr, xfrm_address_t *saddr)
806 {
807 	if (daddr->a4 == x->id.daddr.a4 &&
808 	    (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
809 		return 1;
810 	return 0;
811 }
812 
813 static __inline__ int
814 __xfrm6_state_addr_check(struct xfrm_state *x,
815 			 xfrm_address_t *daddr, xfrm_address_t *saddr)
816 {
817 	if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
818 	    (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
819 	     ipv6_addr_any((struct in6_addr *)saddr) ||
820 	     ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
821 		return 1;
822 	return 0;
823 }
824 
825 static __inline__ int
826 xfrm_state_addr_check(struct xfrm_state *x,
827 		      xfrm_address_t *daddr, xfrm_address_t *saddr,
828 		      unsigned short family)
829 {
830 	switch (family) {
831 	case AF_INET:
832 		return __xfrm4_state_addr_check(x, daddr, saddr);
833 	case AF_INET6:
834 		return __xfrm6_state_addr_check(x, daddr, saddr);
835 	}
836 	return 0;
837 }
838 
839 static __inline__ int
840 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
841 			   unsigned short family)
842 {
843 	switch (family) {
844 	case AF_INET:
845 		return __xfrm4_state_addr_check(x,
846 						(xfrm_address_t *)&fl->fl4_dst,
847 						(xfrm_address_t *)&fl->fl4_src);
848 	case AF_INET6:
849 		return __xfrm6_state_addr_check(x,
850 						(xfrm_address_t *)&fl->fl6_dst,
851 						(xfrm_address_t *)&fl->fl6_src);
852 	}
853 	return 0;
854 }
855 
856 static inline int xfrm_state_kern(struct xfrm_state *x)
857 {
858 	return atomic_read(&x->tunnel_users);
859 }
860 
861 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
862 {
863 	return (!userproto || proto == userproto ||
864 		(userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
865 						  proto == IPPROTO_ESP ||
866 						  proto == IPPROTO_COMP)));
867 }
868 
869 /*
870  * xfrm algorithm information
871  */
872 struct xfrm_algo_auth_info {
873 	u16 icv_truncbits;
874 	u16 icv_fullbits;
875 };
876 
877 struct xfrm_algo_encr_info {
878 	u16 blockbits;
879 	u16 defkeybits;
880 };
881 
882 struct xfrm_algo_comp_info {
883 	u16 threshold;
884 };
885 
886 struct xfrm_algo_desc {
887 	char *name;
888 	char *compat;
889 	u8 available:1;
890 	union {
891 		struct xfrm_algo_auth_info auth;
892 		struct xfrm_algo_encr_info encr;
893 		struct xfrm_algo_comp_info comp;
894 	} uinfo;
895 	struct sadb_alg desc;
896 };
897 
898 /* XFRM tunnel handlers.  */
899 struct xfrm_tunnel {
900 	int (*handler)(struct sk_buff *skb);
901 	int (*err_handler)(struct sk_buff *skb, __u32 info);
902 
903 	struct xfrm_tunnel *next;
904 	int priority;
905 };
906 
907 struct xfrm6_tunnel {
908 	int (*handler)(struct sk_buff *skb);
909 	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
910 			   int type, int code, int offset, __be32 info);
911 	struct xfrm6_tunnel *next;
912 	int priority;
913 };
914 
915 extern void xfrm_init(void);
916 extern void xfrm4_init(void);
917 extern void xfrm6_init(void);
918 extern void xfrm6_fini(void);
919 extern void xfrm_state_init(void);
920 extern void xfrm4_state_init(void);
921 extern void xfrm6_state_init(void);
922 extern void xfrm6_state_fini(void);
923 
924 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
925 extern struct xfrm_state *xfrm_state_alloc(void);
926 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
927 					  struct flowi *fl, struct xfrm_tmpl *tmpl,
928 					  struct xfrm_policy *pol, int *err,
929 					  unsigned short family);
930 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
931 					       xfrm_address_t *saddr,
932 					       unsigned short family,
933 					       u8 mode, u8 proto, u32 reqid);
934 extern int xfrm_state_check_expire(struct xfrm_state *x);
935 extern void xfrm_state_insert(struct xfrm_state *x);
936 extern int xfrm_state_add(struct xfrm_state *x);
937 extern int xfrm_state_update(struct xfrm_state *x);
938 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
939 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
940 #ifdef CONFIG_XFRM_SUB_POLICY
941 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
942 			  int n, unsigned short family);
943 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
944 			   int n, unsigned short family);
945 #else
946 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
947 				 int n, unsigned short family)
948 {
949 	return -ENOSYS;
950 }
951 
952 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
953 				  int n, unsigned short family)
954 {
955 	return -ENOSYS;
956 }
957 #endif
958 
959 struct xfrmk_sadinfo {
960 	u32 sadhcnt; /* current hash bkts */
961 	u32 sadhmcnt; /* max allowed hash bkts */
962 	u32 sadcnt; /* current running count */
963 };
964 
965 struct xfrmk_spdinfo {
966 	u32 incnt;
967 	u32 outcnt;
968 	u32 fwdcnt;
969 	u32 inscnt;
970 	u32 outscnt;
971 	u32 fwdscnt;
972 	u32 spdhcnt;
973 	u32 spdhmcnt;
974 };
975 
976 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
977 extern int xfrm_state_delete(struct xfrm_state *x);
978 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
979 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
980 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
981 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
982 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
983 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
984 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
985 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
986 extern int xfrm_init_state(struct xfrm_state *x);
987 extern int xfrm4_rcv(struct sk_buff *skb);
988 extern int xfrm4_output(struct sk_buff *skb);
989 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
990 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
991 extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi);
992 extern int xfrm6_rcv(struct sk_buff **pskb);
993 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
994 			    xfrm_address_t *saddr, u8 proto);
995 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
996 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
997 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
998 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
999 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1000 extern int xfrm6_output(struct sk_buff *skb);
1001 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1002 				 u8 **prevhdr);
1003 
1004 #ifdef CONFIG_XFRM
1005 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1006 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1007 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
1008 #else
1009 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1010 {
1011  	return -ENOPROTOOPT;
1012 }
1013 
1014 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1015 {
1016  	/* should not happen */
1017  	kfree_skb(skb);
1018 	return 0;
1019 }
1020 
1021 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
1022 {
1023 	return -EINVAL;
1024 }
1025 #endif
1026 
1027 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1028 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1029 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1030 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1031 					  struct xfrm_selector *sel,
1032 					  struct xfrm_sec_ctx *ctx, int delete,
1033 					  int *err);
1034 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1035 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1036 u32 xfrm_get_acqseq(void);
1037 void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi);
1038 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1039 				  xfrm_address_t *daddr, xfrm_address_t *saddr,
1040 				  int create, unsigned short family);
1041 extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1042 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1043 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1044 			  struct flowi *fl, int family, int strict);
1045 extern void xfrm_init_pmtu(struct dst_entry *dst);
1046 
1047 #ifdef CONFIG_XFRM_MIGRATE
1048 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1049 		      struct xfrm_migrate *m, int num_bundles);
1050 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1051 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1052 					      struct xfrm_migrate *m);
1053 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1054 			struct xfrm_migrate *m, int num_bundles);
1055 #endif
1056 
1057 extern wait_queue_head_t km_waitq;
1058 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1059 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1060 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1061 
1062 extern void xfrm_input_init(void);
1063 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1064 
1065 extern void xfrm_probe_algs(void);
1066 extern int xfrm_count_auth_supported(void);
1067 extern int xfrm_count_enc_supported(void);
1068 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1069 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1070 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1071 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1072 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1073 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1074 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1075 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1076 
1077 struct hash_desc;
1078 struct scatterlist;
1079 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1080 			      unsigned int);
1081 
1082 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1083 			int offset, int len, icv_update_fn_t icv_update);
1084 
1085 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1086 				int family)
1087 {
1088 	switch (family) {
1089 	default:
1090 	case AF_INET:
1091 		return (__force __u32)a->a4 - (__force __u32)b->a4;
1092 	case AF_INET6:
1093 		return ipv6_addr_cmp((struct in6_addr *)a,
1094 				     (struct in6_addr *)b);
1095 	}
1096 }
1097 
1098 static inline int xfrm_policy_id2dir(u32 index)
1099 {
1100 	return index & 7;
1101 }
1102 
1103 static inline int xfrm_aevent_is_on(void)
1104 {
1105 	struct sock *nlsk;
1106 	int ret = 0;
1107 
1108 	rcu_read_lock();
1109 	nlsk = rcu_dereference(xfrm_nl);
1110 	if (nlsk)
1111 		ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1112 	rcu_read_unlock();
1113 	return ret;
1114 }
1115 
1116 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1117 {
1118 	if (xfrm_aevent_is_on())
1119 		xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1120 }
1121 
1122 #ifdef CONFIG_XFRM_MIGRATE
1123 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1124 {
1125 	return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL);
1126 }
1127 
1128 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1129 {
1130 	int i;
1131 	for (i = 0; i < n; i++)
1132 		xfrm_state_put(*(states + i));
1133 }
1134 
1135 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1136 {
1137 	int i;
1138 	for (i = 0; i < n; i++)
1139 		xfrm_state_delete(*(states + i));
1140 }
1141 #endif
1142 
1143 #endif	/* _NET_XFRM_H */
1144