xref: /openbmc/linux/include/net/xfrm.h (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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_ALIGN8(len)	(((len) + 7) & ~7)
23 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
24 	MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
25 
26 extern struct sock *xfrm_nl;
27 extern u32 sysctl_xfrm_aevent_etime;
28 extern u32 sysctl_xfrm_aevent_rseqth;
29 
30 extern struct mutex xfrm_cfg_mutex;
31 
32 /* Organization of SPD aka "XFRM rules"
33    ------------------------------------
34 
35    Basic objects:
36    - policy rule, struct xfrm_policy (=SPD entry)
37    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
38    - instance of a transformer, struct xfrm_state (=SA)
39    - template to clone xfrm_state, struct xfrm_tmpl
40 
41    SPD is plain linear list of xfrm_policy rules, ordered by priority.
42    (To be compatible with existing pfkeyv2 implementations,
43    many rules with priority of 0x7fffffff are allowed to exist and
44    such rules are ordered in an unpredictable way, thanks to bsd folks.)
45 
46    Lookup is plain linear search until the first match with selector.
47 
48    If "action" is "block", then we prohibit the flow, otherwise:
49    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
50    policy entry has list of up to XFRM_MAX_DEPTH transformations,
51    described by templates xfrm_tmpl. Each template is resolved
52    to a complete xfrm_state (see below) and we pack bundle of transformations
53    to a dst_entry returned to requestor.
54 
55    dst -. xfrm  .-> xfrm_state #1
56     |---. child .-> dst -. xfrm .-> xfrm_state #2
57                      |---. child .-> dst -. xfrm .-> xfrm_state #3
58                                       |---. child .-> NULL
59 
60    Bundles are cached at xrfm_policy struct (field ->bundles).
61 
62 
63    Resolution of xrfm_tmpl
64    -----------------------
65    Template contains:
66    1. ->mode		Mode: transport or tunnel
67    2. ->id.proto	Protocol: AH/ESP/IPCOMP
68    3. ->id.daddr	Remote tunnel endpoint, ignored for transport mode.
69       Q: allow to resolve security gateway?
70    4. ->id.spi          If not zero, static SPI.
71    5. ->saddr		Local tunnel endpoint, ignored for transport mode.
72    6. ->algos		List of allowed algos. Plain bitmask now.
73       Q: ealgos, aalgos, calgos. What a mess...
74    7. ->share		Sharing mode.
75       Q: how to implement private sharing mode? To add struct sock* to
76       flow id?
77 
78    Having this template we search through SAD searching for entries
79    with appropriate mode/proto/algo, permitted by selector.
80    If no appropriate entry found, it is requested from key manager.
81 
82    PROBLEMS:
83    Q: How to find all the bundles referring to a physical path for
84       PMTU discovery? Seems, dst should contain list of all parents...
85       and enter to infinite locking hierarchy disaster.
86       No! It is easier, we will not search for them, let them find us.
87       We add genid to each dst plus pointer to genid of raw IP route,
88       pmtu disc will update pmtu on raw IP route and increase its genid.
89       dst_check() will see this for top level and trigger resyncing
90       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
91  */
92 
93 /* Full description of state of transformer. */
94 struct xfrm_state
95 {
96 	/* Note: bydst is re-used during gc */
97 	struct hlist_node	bydst;
98 	struct hlist_node	bysrc;
99 	struct hlist_node	byspi;
100 
101 	atomic_t		refcnt;
102 	spinlock_t		lock;
103 
104 	struct xfrm_id		id;
105 	struct xfrm_selector	sel;
106 
107 	u32			genid;
108 
109 	/* Key manger bits */
110 	struct {
111 		u8		state;
112 		u8		dying;
113 		u32		seq;
114 	} km;
115 
116 	/* Parameters of this state. */
117 	struct {
118 		u32		reqid;
119 		u8		mode;
120 		u8		replay_window;
121 		u8		aalgo, ealgo, calgo;
122 		u8		flags;
123 		u16		family;
124 		xfrm_address_t	saddr;
125 		int		header_len;
126 		int		trailer_len;
127 	} props;
128 
129 	struct xfrm_lifetime_cfg lft;
130 
131 	/* Data for transformer */
132 	struct xfrm_algo	*aalg;
133 	struct xfrm_algo	*ealg;
134 	struct xfrm_algo	*calg;
135 
136 	/* Data for encapsulator */
137 	struct xfrm_encap_tmpl	*encap;
138 
139 	/* Data for care-of address */
140 	xfrm_address_t	*coaddr;
141 
142 	/* IPComp needs an IPIP tunnel for handling uncompressed packets */
143 	struct xfrm_state	*tunnel;
144 
145 	/* If a tunnel, number of users + 1 */
146 	atomic_t		tunnel_users;
147 
148 	/* State for replay detection */
149 	struct xfrm_replay_state replay;
150 
151 	/* Replay detection state at the time we sent the last notification */
152 	struct xfrm_replay_state preplay;
153 
154 	/* internal flag that only holds state for delayed aevent at the
155 	 * moment
156 	*/
157 	u32			xflags;
158 
159 	/* Replay detection notification settings */
160 	u32			replay_maxage;
161 	u32			replay_maxdiff;
162 
163 	/* Replay detection notification timer */
164 	struct timer_list	rtimer;
165 
166 	/* Statistics */
167 	struct xfrm_stats	stats;
168 
169 	struct xfrm_lifetime_cur curlft;
170 	struct timer_list	timer;
171 
172 	/* Last used time */
173 	u64			lastused;
174 
175 	/* Reference to data common to all the instances of this
176 	 * transformer. */
177 	struct xfrm_type	*type;
178 	struct xfrm_mode	*mode;
179 
180 	/* Security context */
181 	struct xfrm_sec_ctx	*security;
182 
183 	/* Private data of this transformer, format is opaque,
184 	 * interpreted by xfrm_type methods. */
185 	void			*data;
186 };
187 
188 /* xflags - make enum if more show up */
189 #define XFRM_TIME_DEFER	1
190 
191 enum {
192 	XFRM_STATE_VOID,
193 	XFRM_STATE_ACQ,
194 	XFRM_STATE_VALID,
195 	XFRM_STATE_ERROR,
196 	XFRM_STATE_EXPIRED,
197 	XFRM_STATE_DEAD
198 };
199 
200 /* callback structure passed from either netlink or pfkey */
201 struct km_event
202 {
203 	union {
204 		u32 hard;
205 		u32 proto;
206 		u32 byid;
207 		u32 aevent;
208 		u32 type;
209 	} data;
210 
211 	u32	seq;
212 	u32	pid;
213 	u32	event;
214 };
215 
216 struct xfrm_type;
217 struct xfrm_dst;
218 struct xfrm_policy_afinfo {
219 	unsigned short		family;
220 	struct xfrm_type	*type_map[IPPROTO_MAX];
221 	struct xfrm_mode	*mode_map[XFRM_MODE_MAX];
222 	struct dst_ops		*dst_ops;
223 	void			(*garbage_collect)(void);
224 	int			(*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
225 	int			(*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
226 	struct dst_entry	*(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
227 	int			(*bundle_create)(struct xfrm_policy *policy,
228 						 struct xfrm_state **xfrm,
229 						 int nx,
230 						 struct flowi *fl,
231 						 struct dst_entry **dst_p);
232 	void			(*decode_session)(struct sk_buff *skb,
233 						  struct flowi *fl);
234 };
235 
236 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
237 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
238 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
239 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
240 #define XFRM_ACQ_EXPIRES	30
241 
242 struct xfrm_tmpl;
243 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
244 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
245 extern int __xfrm_state_delete(struct xfrm_state *x);
246 
247 struct xfrm_state_afinfo {
248 	unsigned short		family;
249 	int			(*init_flags)(struct xfrm_state *x);
250 	void			(*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
251 						struct xfrm_tmpl *tmpl,
252 						xfrm_address_t *daddr, xfrm_address_t *saddr);
253 	int			(*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
254 	int			(*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
255 	int			(*output)(struct sk_buff *skb);
256 };
257 
258 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
259 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
260 extern struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family);
261 extern void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
262 
263 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
264 
265 struct xfrm_type
266 {
267 	char			*description;
268 	struct module		*owner;
269 	__u8			proto;
270 	__u8			flags;
271 #define XFRM_TYPE_NON_FRAGMENT	1
272 
273 	int			(*init_state)(struct xfrm_state *x);
274 	void			(*destructor)(struct xfrm_state *);
275 	int			(*input)(struct xfrm_state *, struct sk_buff *skb);
276 	int			(*output)(struct xfrm_state *, struct sk_buff *pskb);
277 	int			(*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
278 	int			(*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
279 	xfrm_address_t		*(*local_addr)(struct xfrm_state *, xfrm_address_t *);
280 	xfrm_address_t		*(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
281 	/* Estimate maximal size of result of transformation of a dgram */
282 	u32			(*get_mtu)(struct xfrm_state *, int size);
283 };
284 
285 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
286 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
287 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
288 extern void xfrm_put_type(struct xfrm_type *type);
289 
290 struct xfrm_mode {
291 	int (*input)(struct xfrm_state *x, struct sk_buff *skb);
292 	int (*output)(struct xfrm_state *x,struct sk_buff *skb);
293 
294 	struct module *owner;
295 	unsigned int encap;
296 };
297 
298 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
299 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
300 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
301 extern void xfrm_put_mode(struct xfrm_mode *mode);
302 
303 struct xfrm_tmpl
304 {
305 /* id in template is interpreted as:
306  * daddr - destination of tunnel, may be zero for transport mode.
307  * spi   - zero to acquire spi. Not zero if spi is static, then
308  *	   daddr must be fixed too.
309  * proto - AH/ESP/IPCOMP
310  */
311 	struct xfrm_id		id;
312 
313 /* Source address of tunnel. Ignored, if it is not a tunnel. */
314 	xfrm_address_t		saddr;
315 
316 	unsigned short		encap_family;
317 
318 	__u32			reqid;
319 
320 /* Mode: transport, tunnel etc. */
321 	__u8			mode;
322 
323 /* Sharing mode: unique, this session only, this user only etc. */
324 	__u8			share;
325 
326 /* May skip this transfomration if no SA is found */
327 	__u8			optional;
328 
329 /* Bit mask of algos allowed for acquisition */
330 	__u32			aalgos;
331 	__u32			ealgos;
332 	__u32			calgos;
333 };
334 
335 #define XFRM_MAX_DEPTH		6
336 
337 struct xfrm_policy
338 {
339 	struct xfrm_policy	*next;
340 	struct hlist_node	bydst;
341 	struct hlist_node	byidx;
342 
343 	/* This lock only affects elements except for entry. */
344 	rwlock_t		lock;
345 	atomic_t		refcnt;
346 	struct timer_list	timer;
347 
348 	u32			priority;
349 	u32			index;
350 	struct xfrm_selector	selector;
351 	struct xfrm_lifetime_cfg lft;
352 	struct xfrm_lifetime_cur curlft;
353 	struct dst_entry       *bundles;
354 	u16			family;
355 	u8			type;
356 	u8			action;
357 	u8			flags;
358 	u8			dead;
359 	u8			xfrm_nr;
360 	/* XXX 1 byte hole, try to pack */
361 	struct xfrm_sec_ctx	*security;
362 	struct xfrm_tmpl       	xfrm_vec[XFRM_MAX_DEPTH];
363 };
364 
365 struct xfrm_migrate {
366 	xfrm_address_t		old_daddr;
367 	xfrm_address_t		old_saddr;
368 	xfrm_address_t		new_daddr;
369 	xfrm_address_t		new_saddr;
370 	u8			proto;
371 	u8			mode;
372 	u16			reserved;
373 	u32			reqid;
374 	u16			old_family;
375 	u16			new_family;
376 };
377 
378 #define XFRM_KM_TIMEOUT                30
379 /* which seqno */
380 #define XFRM_REPLAY_SEQ		1
381 #define XFRM_REPLAY_OSEQ	2
382 #define XFRM_REPLAY_SEQ_MASK	3
383 /* what happened */
384 #define XFRM_REPLAY_UPDATE	XFRM_AE_CR
385 #define XFRM_REPLAY_TIMEOUT	XFRM_AE_CE
386 
387 /* default aevent timeout in units of 100ms */
388 #define XFRM_AE_ETIME			10
389 /* Async Event timer multiplier */
390 #define XFRM_AE_ETH_M			10
391 /* default seq threshold size */
392 #define XFRM_AE_SEQT_SIZE		2
393 
394 struct xfrm_mgr
395 {
396 	struct list_head	list;
397 	char			*id;
398 	int			(*notify)(struct xfrm_state *x, struct km_event *c);
399 	int			(*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
400 	struct xfrm_policy	*(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
401 	int			(*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
402 	int			(*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
403 	int			(*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
404 	int			(*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
405 };
406 
407 extern int xfrm_register_km(struct xfrm_mgr *km);
408 extern int xfrm_unregister_km(struct xfrm_mgr *km);
409 
410 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
411 
412 /* Audit Information */
413 struct xfrm_audit
414 {
415 	uid_t	loginuid;
416 	u32	secid;
417 };
418 
419 #ifdef CONFIG_AUDITSYSCALL
420 extern void xfrm_audit_log(uid_t auid, u32 secid, int type, int result,
421 		    struct xfrm_policy *xp, struct xfrm_state *x);
422 #else
423 #define xfrm_audit_log(a,s,t,r,p,x) do { ; } while (0)
424 #endif /* CONFIG_AUDITSYSCALL */
425 
426 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
427 {
428 	if (likely(policy != NULL))
429 		atomic_inc(&policy->refcnt);
430 }
431 
432 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
433 
434 static inline void xfrm_pol_put(struct xfrm_policy *policy)
435 {
436 	if (atomic_dec_and_test(&policy->refcnt))
437 		__xfrm_policy_destroy(policy);
438 }
439 
440 #ifdef CONFIG_XFRM_SUB_POLICY
441 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
442 {
443 	int i;
444 	for (i = npols - 1; i >= 0; --i)
445 		xfrm_pol_put(pols[i]);
446 }
447 #else
448 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
449 {
450 	xfrm_pol_put(pols[0]);
451 }
452 #endif
453 
454 extern void __xfrm_state_destroy(struct xfrm_state *);
455 
456 static inline void __xfrm_state_put(struct xfrm_state *x)
457 {
458 	atomic_dec(&x->refcnt);
459 }
460 
461 static inline void xfrm_state_put(struct xfrm_state *x)
462 {
463 	if (atomic_dec_and_test(&x->refcnt))
464 		__xfrm_state_destroy(x);
465 }
466 
467 static inline void xfrm_state_hold(struct xfrm_state *x)
468 {
469 	atomic_inc(&x->refcnt);
470 }
471 
472 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
473 {
474 	__be32 *a1 = token1;
475 	__be32 *a2 = token2;
476 	int pdw;
477 	int pbi;
478 
479 	pdw = prefixlen >> 5;	  /* num of whole __u32 in prefix */
480 	pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
481 
482 	if (pdw)
483 		if (memcmp(a1, a2, pdw << 2))
484 			return 0;
485 
486 	if (pbi) {
487 		__be32 mask;
488 
489 		mask = htonl((0xffffffff) << (32 - pbi));
490 
491 		if ((a1[pdw] ^ a2[pdw]) & mask)
492 			return 0;
493 	}
494 
495 	return 1;
496 }
497 
498 static __inline__
499 __be16 xfrm_flowi_sport(struct flowi *fl)
500 {
501 	__be16 port;
502 	switch(fl->proto) {
503 	case IPPROTO_TCP:
504 	case IPPROTO_UDP:
505 	case IPPROTO_UDPLITE:
506 	case IPPROTO_SCTP:
507 		port = fl->fl_ip_sport;
508 		break;
509 	case IPPROTO_ICMP:
510 	case IPPROTO_ICMPV6:
511 		port = htons(fl->fl_icmp_type);
512 		break;
513 #ifdef CONFIG_IPV6_MIP6
514 	case IPPROTO_MH:
515 		port = htons(fl->fl_mh_type);
516 		break;
517 #endif
518 	default:
519 		port = 0;	/*XXX*/
520 	}
521 	return port;
522 }
523 
524 static __inline__
525 __be16 xfrm_flowi_dport(struct flowi *fl)
526 {
527 	__be16 port;
528 	switch(fl->proto) {
529 	case IPPROTO_TCP:
530 	case IPPROTO_UDP:
531 	case IPPROTO_UDPLITE:
532 	case IPPROTO_SCTP:
533 		port = fl->fl_ip_dport;
534 		break;
535 	case IPPROTO_ICMP:
536 	case IPPROTO_ICMPV6:
537 		port = htons(fl->fl_icmp_code);
538 		break;
539 	default:
540 		port = 0;	/*XXX*/
541 	}
542 	return port;
543 }
544 
545 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
546 			       unsigned short family);
547 
548 #ifdef CONFIG_SECURITY_NETWORK_XFRM
549 /*	If neither has a context --> match
550  * 	Otherwise, both must have a context and the sids, doi, alg must match
551  */
552 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
553 {
554 	return ((!s1 && !s2) ||
555 		(s1 && s2 &&
556 		 (s1->ctx_sid == s2->ctx_sid) &&
557 		 (s1->ctx_doi == s2->ctx_doi) &&
558 		 (s1->ctx_alg == s2->ctx_alg)));
559 }
560 #else
561 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
562 {
563 	return 1;
564 }
565 #endif
566 
567 /* A struct encoding bundle of transformations to apply to some set of flow.
568  *
569  * dst->child points to the next element of bundle.
570  * dst->xfrm  points to an instanse of transformer.
571  *
572  * Due to unfortunate limitations of current routing cache, which we
573  * have no time to fix, it mirrors struct rtable and bound to the same
574  * routing key, including saddr,daddr. However, we can have many of
575  * bundles differing by session id. All the bundles grow from a parent
576  * policy rule.
577  */
578 struct xfrm_dst
579 {
580 	union {
581 		struct xfrm_dst		*next;
582 		struct dst_entry	dst;
583 		struct rtable		rt;
584 		struct rt6_info		rt6;
585 	} u;
586 	struct dst_entry *route;
587 #ifdef CONFIG_XFRM_SUB_POLICY
588 	struct flowi *origin;
589 	struct xfrm_selector *partner;
590 #endif
591 	u32 genid;
592 	u32 route_mtu_cached;
593 	u32 child_mtu_cached;
594 	u32 route_cookie;
595 	u32 path_cookie;
596 };
597 
598 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
599 {
600 	dst_release(xdst->route);
601 	if (likely(xdst->u.dst.xfrm))
602 		xfrm_state_put(xdst->u.dst.xfrm);
603 #ifdef CONFIG_XFRM_SUB_POLICY
604 	kfree(xdst->origin);
605 	xdst->origin = NULL;
606 	kfree(xdst->partner);
607 	xdst->partner = NULL;
608 #endif
609 }
610 
611 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
612 
613 struct sec_path
614 {
615 	atomic_t		refcnt;
616 	int			len;
617 	struct xfrm_state	*xvec[XFRM_MAX_DEPTH];
618 };
619 
620 static inline struct sec_path *
621 secpath_get(struct sec_path *sp)
622 {
623 	if (sp)
624 		atomic_inc(&sp->refcnt);
625 	return sp;
626 }
627 
628 extern void __secpath_destroy(struct sec_path *sp);
629 
630 static inline void
631 secpath_put(struct sec_path *sp)
632 {
633 	if (sp && atomic_dec_and_test(&sp->refcnt))
634 		__secpath_destroy(sp);
635 }
636 
637 extern struct sec_path *secpath_dup(struct sec_path *src);
638 
639 static inline void
640 secpath_reset(struct sk_buff *skb)
641 {
642 #ifdef CONFIG_XFRM
643 	secpath_put(skb->sp);
644 	skb->sp = NULL;
645 #endif
646 }
647 
648 static inline int
649 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
650 {
651 	switch (family) {
652 	case AF_INET:
653 		return addr->a4 == 0;
654 	case AF_INET6:
655 		return ipv6_addr_any((struct in6_addr *)&addr->a6);
656 	}
657 	return 0;
658 }
659 
660 static inline int
661 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
662 {
663 	return	(tmpl->saddr.a4 &&
664 		 tmpl->saddr.a4 != x->props.saddr.a4);
665 }
666 
667 static inline int
668 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
669 {
670 	return	(!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
671 		 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
672 }
673 
674 static inline int
675 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
676 {
677 	switch (family) {
678 	case AF_INET:
679 		return __xfrm4_state_addr_cmp(tmpl, x);
680 	case AF_INET6:
681 		return __xfrm6_state_addr_cmp(tmpl, x);
682 	}
683 	return !0;
684 }
685 
686 #ifdef CONFIG_XFRM
687 
688 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
689 
690 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
691 {
692 	if (sk && sk->sk_policy[XFRM_POLICY_IN])
693 		return __xfrm_policy_check(sk, dir, skb, family);
694 
695 	return	(!xfrm_policy_count[dir] && !skb->sp) ||
696 		(skb->dst->flags & DST_NOPOLICY) ||
697 		__xfrm_policy_check(sk, dir, skb, family);
698 }
699 
700 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
701 {
702 	return xfrm_policy_check(sk, dir, skb, AF_INET);
703 }
704 
705 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
706 {
707 	return xfrm_policy_check(sk, dir, skb, AF_INET6);
708 }
709 
710 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
711 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
712 
713 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
714 {
715 	return	!xfrm_policy_count[XFRM_POLICY_OUT] ||
716 		(skb->dst->flags & DST_NOXFRM) ||
717 		__xfrm_route_forward(skb, family);
718 }
719 
720 static inline int xfrm4_route_forward(struct sk_buff *skb)
721 {
722 	return xfrm_route_forward(skb, AF_INET);
723 }
724 
725 static inline int xfrm6_route_forward(struct sk_buff *skb)
726 {
727 	return xfrm_route_forward(skb, AF_INET6);
728 }
729 
730 extern int __xfrm_sk_clone_policy(struct sock *sk);
731 
732 static inline int xfrm_sk_clone_policy(struct sock *sk)
733 {
734 	if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
735 		return __xfrm_sk_clone_policy(sk);
736 	return 0;
737 }
738 
739 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
740 
741 static inline void xfrm_sk_free_policy(struct sock *sk)
742 {
743 	if (unlikely(sk->sk_policy[0] != NULL)) {
744 		xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
745 		sk->sk_policy[0] = NULL;
746 	}
747 	if (unlikely(sk->sk_policy[1] != NULL)) {
748 		xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
749 		sk->sk_policy[1] = NULL;
750 	}
751 }
752 
753 #else
754 
755 static inline void xfrm_sk_free_policy(struct sock *sk) {}
756 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
757 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
758 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
759 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
760 {
761 	return 1;
762 }
763 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
764 {
765 	return 1;
766 }
767 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
768 {
769 	return 1;
770 }
771 #endif
772 
773 static __inline__
774 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
775 {
776 	switch (family){
777 	case AF_INET:
778 		return (xfrm_address_t *)&fl->fl4_dst;
779 	case AF_INET6:
780 		return (xfrm_address_t *)&fl->fl6_dst;
781 	}
782 	return NULL;
783 }
784 
785 static __inline__
786 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
787 {
788 	switch (family){
789 	case AF_INET:
790 		return (xfrm_address_t *)&fl->fl4_src;
791 	case AF_INET6:
792 		return (xfrm_address_t *)&fl->fl6_src;
793 	}
794 	return NULL;
795 }
796 
797 static __inline__ int
798 __xfrm4_state_addr_check(struct xfrm_state *x,
799 			 xfrm_address_t *daddr, xfrm_address_t *saddr)
800 {
801 	if (daddr->a4 == x->id.daddr.a4 &&
802 	    (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
803 		return 1;
804 	return 0;
805 }
806 
807 static __inline__ int
808 __xfrm6_state_addr_check(struct xfrm_state *x,
809 			 xfrm_address_t *daddr, xfrm_address_t *saddr)
810 {
811 	if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
812 	    (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
813 	     ipv6_addr_any((struct in6_addr *)saddr) ||
814 	     ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
815 		return 1;
816 	return 0;
817 }
818 
819 static __inline__ int
820 xfrm_state_addr_check(struct xfrm_state *x,
821 		      xfrm_address_t *daddr, xfrm_address_t *saddr,
822 		      unsigned short family)
823 {
824 	switch (family) {
825 	case AF_INET:
826 		return __xfrm4_state_addr_check(x, daddr, saddr);
827 	case AF_INET6:
828 		return __xfrm6_state_addr_check(x, daddr, saddr);
829 	}
830 	return 0;
831 }
832 
833 static __inline__ int
834 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
835 			   unsigned short family)
836 {
837 	switch (family) {
838 	case AF_INET:
839 		return __xfrm4_state_addr_check(x,
840 						(xfrm_address_t *)&fl->fl4_dst,
841 						(xfrm_address_t *)&fl->fl4_src);
842 	case AF_INET6:
843 		return __xfrm6_state_addr_check(x,
844 						(xfrm_address_t *)&fl->fl6_dst,
845 						(xfrm_address_t *)&fl->fl6_src);
846 	}
847 	return 0;
848 }
849 
850 static inline int xfrm_state_kern(struct xfrm_state *x)
851 {
852 	return atomic_read(&x->tunnel_users);
853 }
854 
855 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
856 {
857 	return (!userproto || proto == userproto ||
858 		(userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
859 						  proto == IPPROTO_ESP ||
860 						  proto == IPPROTO_COMP)));
861 }
862 
863 /*
864  * xfrm algorithm information
865  */
866 struct xfrm_algo_auth_info {
867 	u16 icv_truncbits;
868 	u16 icv_fullbits;
869 };
870 
871 struct xfrm_algo_encr_info {
872 	u16 blockbits;
873 	u16 defkeybits;
874 };
875 
876 struct xfrm_algo_comp_info {
877 	u16 threshold;
878 };
879 
880 struct xfrm_algo_desc {
881 	char *name;
882 	char *compat;
883 	u8 available:1;
884 	union {
885 		struct xfrm_algo_auth_info auth;
886 		struct xfrm_algo_encr_info encr;
887 		struct xfrm_algo_comp_info comp;
888 	} uinfo;
889 	struct sadb_alg desc;
890 };
891 
892 /* XFRM tunnel handlers.  */
893 struct xfrm_tunnel {
894 	int (*handler)(struct sk_buff *skb);
895 	int (*err_handler)(struct sk_buff *skb, __u32 info);
896 
897 	struct xfrm_tunnel *next;
898 	int priority;
899 };
900 
901 struct xfrm6_tunnel {
902 	int (*handler)(struct sk_buff *skb);
903 	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
904 			   int type, int code, int offset, __be32 info);
905 	struct xfrm6_tunnel *next;
906 	int priority;
907 };
908 
909 extern void xfrm_init(void);
910 extern void xfrm4_init(void);
911 extern void xfrm6_init(void);
912 extern void xfrm6_fini(void);
913 extern void xfrm_state_init(void);
914 extern void xfrm4_state_init(void);
915 extern void xfrm6_state_init(void);
916 extern void xfrm6_state_fini(void);
917 
918 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
919 extern struct xfrm_state *xfrm_state_alloc(void);
920 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
921 					  struct flowi *fl, struct xfrm_tmpl *tmpl,
922 					  struct xfrm_policy *pol, int *err,
923 					  unsigned short family);
924 extern int xfrm_state_check_expire(struct xfrm_state *x);
925 extern void xfrm_state_insert(struct xfrm_state *x);
926 extern int xfrm_state_add(struct xfrm_state *x);
927 extern int xfrm_state_update(struct xfrm_state *x);
928 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
929 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
930 #ifdef CONFIG_XFRM_SUB_POLICY
931 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
932 			  int n, unsigned short family);
933 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
934 			   int n, unsigned short family);
935 #else
936 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
937 				 int n, unsigned short family)
938 {
939 	return -ENOSYS;
940 }
941 
942 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
943 				  int n, unsigned short family)
944 {
945 	return -ENOSYS;
946 }
947 #endif
948 
949 struct xfrmk_sadinfo {
950 	u32 sadhcnt; /* current hash bkts */
951 	u32 sadhmcnt; /* max allowed hash bkts */
952 	u32 sadcnt; /* current running count */
953 };
954 
955 struct xfrmk_spdinfo {
956 	u32 incnt;
957 	u32 outcnt;
958 	u32 fwdcnt;
959 	u32 inscnt;
960 	u32 outscnt;
961 	u32 fwdscnt;
962 	u32 spdhcnt;
963 	u32 spdhmcnt;
964 };
965 
966 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
967 extern int xfrm_state_delete(struct xfrm_state *x);
968 extern void xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
969 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
970 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
971 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
972 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
973 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
974 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
975 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
976 extern int xfrm_init_state(struct xfrm_state *x);
977 extern int xfrm4_rcv(struct sk_buff *skb);
978 extern int xfrm4_output(struct sk_buff *skb);
979 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
980 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
981 extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi);
982 extern int xfrm6_rcv(struct sk_buff **pskb);
983 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
984 			    xfrm_address_t *saddr, u8 proto);
985 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
986 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
987 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
988 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
989 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
990 extern int xfrm6_output(struct sk_buff *skb);
991 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
992 				 u8 **prevhdr);
993 
994 #ifdef CONFIG_XFRM
995 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
996 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
997 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
998 #else
999 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1000 {
1001  	return -ENOPROTOOPT;
1002 }
1003 
1004 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
1005 {
1006  	/* should not happen */
1007  	kfree_skb(skb);
1008 	return 0;
1009 }
1010 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
1011 {
1012 	return -EINVAL;
1013 }
1014 #endif
1015 
1016 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1017 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1018 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1019 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1020 					  struct xfrm_selector *sel,
1021 					  struct xfrm_sec_ctx *ctx, int delete,
1022 					  int *err);
1023 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1024 void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1025 u32 xfrm_get_acqseq(void);
1026 void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi);
1027 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1028 				  xfrm_address_t *daddr, xfrm_address_t *saddr,
1029 				  int create, unsigned short family);
1030 extern void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1031 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1032 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1033 			  struct flowi *fl, int family, int strict);
1034 extern void xfrm_init_pmtu(struct dst_entry *dst);
1035 
1036 #ifdef CONFIG_XFRM_MIGRATE
1037 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1038 		      struct xfrm_migrate *m, int num_bundles);
1039 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1040 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1041 					      struct xfrm_migrate *m);
1042 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1043 			struct xfrm_migrate *m, int num_bundles);
1044 #endif
1045 
1046 extern wait_queue_head_t km_waitq;
1047 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1048 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1049 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1050 
1051 extern void xfrm_input_init(void);
1052 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1053 
1054 extern void xfrm_probe_algs(void);
1055 extern int xfrm_count_auth_supported(void);
1056 extern int xfrm_count_enc_supported(void);
1057 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1058 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1059 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1060 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1061 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1062 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1063 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1064 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1065 
1066 struct hash_desc;
1067 struct scatterlist;
1068 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1069 			      unsigned int);
1070 
1071 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1072 			int offset, int len, icv_update_fn_t icv_update);
1073 
1074 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1075 				int family)
1076 {
1077 	switch (family) {
1078 	default:
1079 	case AF_INET:
1080 		return (__force __u32)a->a4 - (__force __u32)b->a4;
1081 	case AF_INET6:
1082 		return ipv6_addr_cmp((struct in6_addr *)a,
1083 				     (struct in6_addr *)b);
1084 	}
1085 }
1086 
1087 static inline int xfrm_policy_id2dir(u32 index)
1088 {
1089 	return index & 7;
1090 }
1091 
1092 static inline int xfrm_aevent_is_on(void)
1093 {
1094 	struct sock *nlsk;
1095 	int ret = 0;
1096 
1097 	rcu_read_lock();
1098 	nlsk = rcu_dereference(xfrm_nl);
1099 	if (nlsk)
1100 		ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1101 	rcu_read_unlock();
1102 	return ret;
1103 }
1104 
1105 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1106 {
1107 	if (xfrm_aevent_is_on())
1108 		xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1109 }
1110 
1111 #ifdef CONFIG_XFRM_MIGRATE
1112 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1113 {
1114 	return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL);
1115 }
1116 
1117 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1118 {
1119 	int i;
1120 	for (i = 0; i < n; i++)
1121 		xfrm_state_put(*(states + i));
1122 }
1123 
1124 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1125 {
1126 	int i;
1127 	for (i = 0; i < n; i++)
1128 		xfrm_state_delete(*(states + i));
1129 }
1130 #endif
1131 
1132 #endif	/* _NET_XFRM_H */
1133