xref: /openbmc/linux/include/net/xfrm.h (revision c8dbaa22)
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 #include <linux/refcount.h>
17 
18 #include <net/sock.h>
19 #include <net/dst.h>
20 #include <net/ip.h>
21 #include <net/route.h>
22 #include <net/ipv6.h>
23 #include <net/ip6_fib.h>
24 #include <net/flow.h>
25 
26 #include <linux/interrupt.h>
27 
28 #ifdef CONFIG_XFRM_STATISTICS
29 #include <net/snmp.h>
30 #endif
31 
32 #define XFRM_PROTO_ESP		50
33 #define XFRM_PROTO_AH		51
34 #define XFRM_PROTO_COMP		108
35 #define XFRM_PROTO_IPIP		4
36 #define XFRM_PROTO_IPV6		41
37 #define XFRM_PROTO_ROUTING	IPPROTO_ROUTING
38 #define XFRM_PROTO_DSTOPTS	IPPROTO_DSTOPTS
39 
40 #define XFRM_ALIGN4(len)	(((len) + 3) & ~3)
41 #define XFRM_ALIGN8(len)	(((len) + 7) & ~7)
42 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
43 	MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
44 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
45 	MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
46 
47 #ifdef CONFIG_XFRM_STATISTICS
48 #define XFRM_INC_STATS(net, field)	SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
49 #else
50 #define XFRM_INC_STATS(net, field)	((void)(net))
51 #endif
52 
53 
54 /* Organization of SPD aka "XFRM rules"
55    ------------------------------------
56 
57    Basic objects:
58    - policy rule, struct xfrm_policy (=SPD entry)
59    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
60    - instance of a transformer, struct xfrm_state (=SA)
61    - template to clone xfrm_state, struct xfrm_tmpl
62 
63    SPD is plain linear list of xfrm_policy rules, ordered by priority.
64    (To be compatible with existing pfkeyv2 implementations,
65    many rules with priority of 0x7fffffff are allowed to exist and
66    such rules are ordered in an unpredictable way, thanks to bsd folks.)
67 
68    Lookup is plain linear search until the first match with selector.
69 
70    If "action" is "block", then we prohibit the flow, otherwise:
71    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
72    policy entry has list of up to XFRM_MAX_DEPTH transformations,
73    described by templates xfrm_tmpl. Each template is resolved
74    to a complete xfrm_state (see below) and we pack bundle of transformations
75    to a dst_entry returned to requestor.
76 
77    dst -. xfrm  .-> xfrm_state #1
78     |---. child .-> dst -. xfrm .-> xfrm_state #2
79                      |---. child .-> dst -. xfrm .-> xfrm_state #3
80                                       |---. child .-> NULL
81 
82    Bundles are cached at xrfm_policy struct (field ->bundles).
83 
84 
85    Resolution of xrfm_tmpl
86    -----------------------
87    Template contains:
88    1. ->mode		Mode: transport or tunnel
89    2. ->id.proto	Protocol: AH/ESP/IPCOMP
90    3. ->id.daddr	Remote tunnel endpoint, ignored for transport mode.
91       Q: allow to resolve security gateway?
92    4. ->id.spi          If not zero, static SPI.
93    5. ->saddr		Local tunnel endpoint, ignored for transport mode.
94    6. ->algos		List of allowed algos. Plain bitmask now.
95       Q: ealgos, aalgos, calgos. What a mess...
96    7. ->share		Sharing mode.
97       Q: how to implement private sharing mode? To add struct sock* to
98       flow id?
99 
100    Having this template we search through SAD searching for entries
101    with appropriate mode/proto/algo, permitted by selector.
102    If no appropriate entry found, it is requested from key manager.
103 
104    PROBLEMS:
105    Q: How to find all the bundles referring to a physical path for
106       PMTU discovery? Seems, dst should contain list of all parents...
107       and enter to infinite locking hierarchy disaster.
108       No! It is easier, we will not search for them, let them find us.
109       We add genid to each dst plus pointer to genid of raw IP route,
110       pmtu disc will update pmtu on raw IP route and increase its genid.
111       dst_check() will see this for top level and trigger resyncing
112       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
113  */
114 
115 struct xfrm_state_walk {
116 	struct list_head	all;
117 	u8			state;
118 	u8			dying;
119 	u8			proto;
120 	u32			seq;
121 	struct xfrm_address_filter *filter;
122 };
123 
124 struct xfrm_state_offload {
125 	struct net_device	*dev;
126 	unsigned long		offload_handle;
127 	unsigned int		num_exthdrs;
128 	u8			flags;
129 };
130 
131 /* Full description of state of transformer. */
132 struct xfrm_state {
133 	possible_net_t		xs_net;
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 	refcount_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 		u32		extra_flags;
166 	} props;
167 
168 	struct xfrm_lifetime_cfg lft;
169 
170 	/* Data for transformer */
171 	struct xfrm_algo_auth	*aalg;
172 	struct xfrm_algo	*ealg;
173 	struct xfrm_algo	*calg;
174 	struct xfrm_algo_aead	*aead;
175 	const char		*geniv;
176 
177 	/* Data for encapsulator */
178 	struct xfrm_encap_tmpl	*encap;
179 
180 	/* Data for care-of address */
181 	xfrm_address_t	*coaddr;
182 
183 	/* IPComp needs an IPIP tunnel for handling uncompressed packets */
184 	struct xfrm_state	*tunnel;
185 
186 	/* If a tunnel, number of users + 1 */
187 	atomic_t		tunnel_users;
188 
189 	/* State for replay detection */
190 	struct xfrm_replay_state replay;
191 	struct xfrm_replay_state_esn *replay_esn;
192 
193 	/* Replay detection state at the time we sent the last notification */
194 	struct xfrm_replay_state preplay;
195 	struct xfrm_replay_state_esn *preplay_esn;
196 
197 	/* The functions for replay detection. */
198 	const struct xfrm_replay *repl;
199 
200 	/* internal flag that only holds state for delayed aevent at the
201 	 * moment
202 	*/
203 	u32			xflags;
204 
205 	/* Replay detection notification settings */
206 	u32			replay_maxage;
207 	u32			replay_maxdiff;
208 
209 	/* Replay detection notification timer */
210 	struct timer_list	rtimer;
211 
212 	/* Statistics */
213 	struct xfrm_stats	stats;
214 
215 	struct xfrm_lifetime_cur curlft;
216 	struct tasklet_hrtimer	mtimer;
217 
218 	struct xfrm_state_offload xso;
219 
220 	/* used to fix curlft->add_time when changing date */
221 	long		saved_tmo;
222 
223 	/* Last used time */
224 	unsigned long		lastused;
225 
226 	struct page_frag xfrag;
227 
228 	/* Reference to data common to all the instances of this
229 	 * transformer. */
230 	const struct xfrm_type	*type;
231 	struct xfrm_mode	*inner_mode;
232 	struct xfrm_mode	*inner_mode_iaf;
233 	struct xfrm_mode	*outer_mode;
234 
235 	const struct xfrm_type_offload	*type_offload;
236 
237 	/* Security context */
238 	struct xfrm_sec_ctx	*security;
239 
240 	/* Private data of this transformer, format is opaque,
241 	 * interpreted by xfrm_type methods. */
242 	void			*data;
243 };
244 
245 static inline struct net *xs_net(struct xfrm_state *x)
246 {
247 	return read_pnet(&x->xs_net);
248 }
249 
250 /* xflags - make enum if more show up */
251 #define XFRM_TIME_DEFER	1
252 #define XFRM_SOFT_EXPIRE 2
253 
254 enum {
255 	XFRM_STATE_VOID,
256 	XFRM_STATE_ACQ,
257 	XFRM_STATE_VALID,
258 	XFRM_STATE_ERROR,
259 	XFRM_STATE_EXPIRED,
260 	XFRM_STATE_DEAD
261 };
262 
263 /* callback structure passed from either netlink or pfkey */
264 struct km_event {
265 	union {
266 		u32 hard;
267 		u32 proto;
268 		u32 byid;
269 		u32 aevent;
270 		u32 type;
271 	} data;
272 
273 	u32	seq;
274 	u32	portid;
275 	u32	event;
276 	struct net *net;
277 };
278 
279 struct xfrm_replay {
280 	void	(*advance)(struct xfrm_state *x, __be32 net_seq);
281 	int	(*check)(struct xfrm_state *x,
282 			 struct sk_buff *skb,
283 			 __be32 net_seq);
284 	int	(*recheck)(struct xfrm_state *x,
285 			   struct sk_buff *skb,
286 			   __be32 net_seq);
287 	void	(*notify)(struct xfrm_state *x, int event);
288 	int	(*overflow)(struct xfrm_state *x, struct sk_buff *skb);
289 };
290 
291 struct net_device;
292 struct xfrm_type;
293 struct xfrm_dst;
294 struct xfrm_policy_afinfo {
295 	struct dst_ops		*dst_ops;
296 	struct dst_entry	*(*dst_lookup)(struct net *net,
297 					       int tos, int oif,
298 					       const xfrm_address_t *saddr,
299 					       const xfrm_address_t *daddr);
300 	int			(*get_saddr)(struct net *net, int oif,
301 					     xfrm_address_t *saddr,
302 					     xfrm_address_t *daddr);
303 	void			(*decode_session)(struct sk_buff *skb,
304 						  struct flowi *fl,
305 						  int reverse);
306 	int			(*get_tos)(const struct flowi *fl);
307 	int			(*init_path)(struct xfrm_dst *path,
308 					     struct dst_entry *dst,
309 					     int nfheader_len);
310 	int			(*fill_dst)(struct xfrm_dst *xdst,
311 					    struct net_device *dev,
312 					    const struct flowi *fl);
313 	struct dst_entry	*(*blackhole_route)(struct net *net, struct dst_entry *orig);
314 };
315 
316 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
317 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
318 void km_policy_notify(struct xfrm_policy *xp, int dir,
319 		      const struct km_event *c);
320 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
321 
322 struct xfrm_tmpl;
323 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
324 	     struct xfrm_policy *pol);
325 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
326 int __xfrm_state_delete(struct xfrm_state *x);
327 
328 struct xfrm_state_afinfo {
329 	unsigned int			family;
330 	unsigned int			proto;
331 	__be16				eth_proto;
332 	struct module			*owner;
333 	const struct xfrm_type		*type_map[IPPROTO_MAX];
334 	const struct xfrm_type_offload	*type_offload_map[IPPROTO_MAX];
335 	struct xfrm_mode		*mode_map[XFRM_MODE_MAX];
336 
337 	int			(*init_flags)(struct xfrm_state *x);
338 	void			(*init_tempsel)(struct xfrm_selector *sel,
339 						const struct flowi *fl);
340 	void			(*init_temprop)(struct xfrm_state *x,
341 						const struct xfrm_tmpl *tmpl,
342 						const xfrm_address_t *daddr,
343 						const xfrm_address_t *saddr);
344 	int			(*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
345 	int			(*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
346 	int			(*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
347 	int			(*output_finish)(struct sock *sk, struct sk_buff *skb);
348 	int			(*extract_input)(struct xfrm_state *x,
349 						 struct sk_buff *skb);
350 	int			(*extract_output)(struct xfrm_state *x,
351 						  struct sk_buff *skb);
352 	int			(*transport_finish)(struct sk_buff *skb,
353 						    int async);
354 	void			(*local_error)(struct sk_buff *skb, u32 mtu);
355 };
356 
357 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
358 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
359 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
360 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
361 
362 struct xfrm_input_afinfo {
363 	unsigned int		family;
364 	int			(*callback)(struct sk_buff *skb, u8 protocol,
365 					    int err);
366 };
367 
368 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
369 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
370 
371 void xfrm_state_delete_tunnel(struct xfrm_state *x);
372 
373 struct xfrm_type {
374 	char			*description;
375 	struct module		*owner;
376 	u8			proto;
377 	u8			flags;
378 #define XFRM_TYPE_NON_FRAGMENT	1
379 #define XFRM_TYPE_REPLAY_PROT	2
380 #define XFRM_TYPE_LOCAL_COADDR	4
381 #define XFRM_TYPE_REMOTE_COADDR	8
382 
383 	int			(*init_state)(struct xfrm_state *x);
384 	void			(*destructor)(struct xfrm_state *);
385 	int			(*input)(struct xfrm_state *, struct sk_buff *skb);
386 	int			(*output)(struct xfrm_state *, struct sk_buff *pskb);
387 	int			(*reject)(struct xfrm_state *, struct sk_buff *,
388 					  const struct flowi *);
389 	int			(*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
390 	/* Estimate maximal size of result of transformation of a dgram */
391 	u32			(*get_mtu)(struct xfrm_state *, int size);
392 };
393 
394 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
395 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
396 
397 struct xfrm_type_offload {
398 	char		*description;
399 	struct module	*owner;
400 	u8		proto;
401 	void		(*encap)(struct xfrm_state *, struct sk_buff *pskb);
402 	int		(*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
403 	int		(*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
404 };
405 
406 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
407 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
408 
409 struct xfrm_mode {
410 	/*
411 	 * Remove encapsulation header.
412 	 *
413 	 * The IP header will be moved over the top of the encapsulation
414 	 * header.
415 	 *
416 	 * On entry, the transport header shall point to where the IP header
417 	 * should be and the network header shall be set to where the IP
418 	 * header currently is.  skb->data shall point to the start of the
419 	 * payload.
420 	 */
421 	int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
422 
423 	/*
424 	 * This is the actual input entry point.
425 	 *
426 	 * For transport mode and equivalent this would be identical to
427 	 * input2 (which does not need to be set).  While tunnel mode
428 	 * and equivalent would set this to the tunnel encapsulation function
429 	 * xfrm4_prepare_input that would in turn call input2.
430 	 */
431 	int (*input)(struct xfrm_state *x, struct sk_buff *skb);
432 
433 	/*
434 	 * Add encapsulation header.
435 	 *
436 	 * On exit, the transport header will be set to the start of the
437 	 * encapsulation header to be filled in by x->type->output and
438 	 * the mac header will be set to the nextheader (protocol for
439 	 * IPv4) field of the extension header directly preceding the
440 	 * encapsulation header, or in its absence, that of the top IP
441 	 * header.  The value of the network header will always point
442 	 * to the top IP header while skb->data will point to the payload.
443 	 */
444 	int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
445 
446 	/*
447 	 * This is the actual output entry point.
448 	 *
449 	 * For transport mode and equivalent this would be identical to
450 	 * output2 (which does not need to be set).  While tunnel mode
451 	 * and equivalent would set this to a tunnel encapsulation function
452 	 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
453 	 * call output2.
454 	 */
455 	int (*output)(struct xfrm_state *x, struct sk_buff *skb);
456 
457 	/*
458 	 * Adjust pointers into the packet and do GSO segmentation.
459 	 */
460 	struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);
461 
462 	/*
463 	 * Adjust pointers into the packet when IPsec is done at layer2.
464 	 */
465 	void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);
466 
467 	struct xfrm_state_afinfo *afinfo;
468 	struct module *owner;
469 	unsigned int encap;
470 	int flags;
471 };
472 
473 /* Flags for xfrm_mode. */
474 enum {
475 	XFRM_MODE_FLAG_TUNNEL = 1,
476 };
477 
478 int xfrm_register_mode(struct xfrm_mode *mode, int family);
479 int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
480 
481 static inline int xfrm_af2proto(unsigned int family)
482 {
483 	switch(family) {
484 	case AF_INET:
485 		return IPPROTO_IPIP;
486 	case AF_INET6:
487 		return IPPROTO_IPV6;
488 	default:
489 		return 0;
490 	}
491 }
492 
493 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
494 {
495 	if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
496 	    (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
497 		return x->inner_mode;
498 	else
499 		return x->inner_mode_iaf;
500 }
501 
502 struct xfrm_tmpl {
503 /* id in template is interpreted as:
504  * daddr - destination of tunnel, may be zero for transport mode.
505  * spi   - zero to acquire spi. Not zero if spi is static, then
506  *	   daddr must be fixed too.
507  * proto - AH/ESP/IPCOMP
508  */
509 	struct xfrm_id		id;
510 
511 /* Source address of tunnel. Ignored, if it is not a tunnel. */
512 	xfrm_address_t		saddr;
513 
514 	unsigned short		encap_family;
515 
516 	u32			reqid;
517 
518 /* Mode: transport, tunnel etc. */
519 	u8			mode;
520 
521 /* Sharing mode: unique, this session only, this user only etc. */
522 	u8			share;
523 
524 /* May skip this transfomration if no SA is found */
525 	u8			optional;
526 
527 /* Skip aalgos/ealgos/calgos checks. */
528 	u8			allalgs;
529 
530 /* Bit mask of algos allowed for acquisition */
531 	u32			aalgos;
532 	u32			ealgos;
533 	u32			calgos;
534 };
535 
536 #define XFRM_MAX_DEPTH		6
537 #define XFRM_MAX_OFFLOAD_DEPTH	1
538 
539 struct xfrm_policy_walk_entry {
540 	struct list_head	all;
541 	u8			dead;
542 };
543 
544 struct xfrm_policy_walk {
545 	struct xfrm_policy_walk_entry walk;
546 	u8 type;
547 	u32 seq;
548 };
549 
550 struct xfrm_policy_queue {
551 	struct sk_buff_head	hold_queue;
552 	struct timer_list	hold_timer;
553 	unsigned long		timeout;
554 };
555 
556 struct xfrm_policy {
557 	possible_net_t		xp_net;
558 	struct hlist_node	bydst;
559 	struct hlist_node	byidx;
560 
561 	/* This lock only affects elements except for entry. */
562 	rwlock_t		lock;
563 	refcount_t		refcnt;
564 	struct timer_list	timer;
565 
566 	struct flow_cache_object flo;
567 	atomic_t		genid;
568 	u32			priority;
569 	u32			index;
570 	struct xfrm_mark	mark;
571 	struct xfrm_selector	selector;
572 	struct xfrm_lifetime_cfg lft;
573 	struct xfrm_lifetime_cur curlft;
574 	struct xfrm_policy_walk_entry walk;
575 	struct xfrm_policy_queue polq;
576 	u8			type;
577 	u8			action;
578 	u8			flags;
579 	u8			xfrm_nr;
580 	u16			family;
581 	struct xfrm_sec_ctx	*security;
582 	struct xfrm_tmpl       	xfrm_vec[XFRM_MAX_DEPTH];
583 	struct rcu_head		rcu;
584 };
585 
586 static inline struct net *xp_net(const struct xfrm_policy *xp)
587 {
588 	return read_pnet(&xp->xp_net);
589 }
590 
591 struct xfrm_kmaddress {
592 	xfrm_address_t          local;
593 	xfrm_address_t          remote;
594 	u32			reserved;
595 	u16			family;
596 };
597 
598 struct xfrm_migrate {
599 	xfrm_address_t		old_daddr;
600 	xfrm_address_t		old_saddr;
601 	xfrm_address_t		new_daddr;
602 	xfrm_address_t		new_saddr;
603 	u8			proto;
604 	u8			mode;
605 	u16			reserved;
606 	u32			reqid;
607 	u16			old_family;
608 	u16			new_family;
609 };
610 
611 #define XFRM_KM_TIMEOUT                30
612 /* what happened */
613 #define XFRM_REPLAY_UPDATE	XFRM_AE_CR
614 #define XFRM_REPLAY_TIMEOUT	XFRM_AE_CE
615 
616 /* default aevent timeout in units of 100ms */
617 #define XFRM_AE_ETIME			10
618 /* Async Event timer multiplier */
619 #define XFRM_AE_ETH_M			10
620 /* default seq threshold size */
621 #define XFRM_AE_SEQT_SIZE		2
622 
623 struct xfrm_mgr {
624 	struct list_head	list;
625 	int			(*notify)(struct xfrm_state *x, const struct km_event *c);
626 	int			(*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
627 	struct xfrm_policy	*(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
628 	int			(*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
629 	int			(*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
630 	int			(*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
631 	int			(*migrate)(const struct xfrm_selector *sel,
632 					   u8 dir, u8 type,
633 					   const struct xfrm_migrate *m,
634 					   int num_bundles,
635 					   const struct xfrm_kmaddress *k,
636 					   const struct xfrm_encap_tmpl *encap);
637 	bool			(*is_alive)(const struct km_event *c);
638 };
639 
640 int xfrm_register_km(struct xfrm_mgr *km);
641 int xfrm_unregister_km(struct xfrm_mgr *km);
642 
643 struct xfrm_tunnel_skb_cb {
644 	union {
645 		struct inet_skb_parm h4;
646 		struct inet6_skb_parm h6;
647 	} header;
648 
649 	union {
650 		struct ip_tunnel *ip4;
651 		struct ip6_tnl *ip6;
652 	} tunnel;
653 };
654 
655 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
656 
657 /*
658  * This structure is used for the duration where packets are being
659  * transformed by IPsec.  As soon as the packet leaves IPsec the
660  * area beyond the generic IP part may be overwritten.
661  */
662 struct xfrm_skb_cb {
663 	struct xfrm_tunnel_skb_cb header;
664 
665         /* Sequence number for replay protection. */
666 	union {
667 		struct {
668 			__u32 low;
669 			__u32 hi;
670 		} output;
671 		struct {
672 			__be32 low;
673 			__be32 hi;
674 		} input;
675 	} seq;
676 };
677 
678 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
679 
680 /*
681  * This structure is used by the afinfo prepare_input/prepare_output functions
682  * to transmit header information to the mode input/output functions.
683  */
684 struct xfrm_mode_skb_cb {
685 	struct xfrm_tunnel_skb_cb header;
686 
687 	/* Copied from header for IPv4, always set to zero and DF for IPv6. */
688 	__be16 id;
689 	__be16 frag_off;
690 
691 	/* IP header length (excluding options or extension headers). */
692 	u8 ihl;
693 
694 	/* TOS for IPv4, class for IPv6. */
695 	u8 tos;
696 
697 	/* TTL for IPv4, hop limitfor IPv6. */
698 	u8 ttl;
699 
700 	/* Protocol for IPv4, NH for IPv6. */
701 	u8 protocol;
702 
703 	/* Option length for IPv4, zero for IPv6. */
704 	u8 optlen;
705 
706 	/* Used by IPv6 only, zero for IPv4. */
707 	u8 flow_lbl[3];
708 };
709 
710 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
711 
712 /*
713  * This structure is used by the input processing to locate the SPI and
714  * related information.
715  */
716 struct xfrm_spi_skb_cb {
717 	struct xfrm_tunnel_skb_cb header;
718 
719 	unsigned int daddroff;
720 	unsigned int family;
721 	__be32 seq;
722 };
723 
724 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
725 
726 #ifdef CONFIG_AUDITSYSCALL
727 static inline struct audit_buffer *xfrm_audit_start(const char *op)
728 {
729 	struct audit_buffer *audit_buf = NULL;
730 
731 	if (audit_enabled == 0)
732 		return NULL;
733 	audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
734 				    AUDIT_MAC_IPSEC_EVENT);
735 	if (audit_buf == NULL)
736 		return NULL;
737 	audit_log_format(audit_buf, "op=%s", op);
738 	return audit_buf;
739 }
740 
741 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
742 					     struct audit_buffer *audit_buf)
743 {
744 	const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
745 					    audit_get_loginuid(current) :
746 					    INVALID_UID);
747 	const unsigned int ses = task_valid ? audit_get_sessionid(current) :
748 		(unsigned int) -1;
749 
750 	audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
751 	audit_log_task_context(audit_buf);
752 }
753 
754 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
755 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
756 			      bool task_valid);
757 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
758 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
759 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
760 				      struct sk_buff *skb);
761 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
762 			     __be32 net_seq);
763 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
764 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
765 			       __be32 net_seq);
766 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
767 			      u8 proto);
768 #else
769 
770 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
771 					 bool task_valid)
772 {
773 }
774 
775 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
776 					    bool task_valid)
777 {
778 }
779 
780 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
781 					bool task_valid)
782 {
783 }
784 
785 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
786 					   bool task_valid)
787 {
788 }
789 
790 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
791 					     struct sk_buff *skb)
792 {
793 }
794 
795 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
796 					   struct sk_buff *skb, __be32 net_seq)
797 {
798 }
799 
800 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
801 				      u16 family)
802 {
803 }
804 
805 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
806 				      __be32 net_spi, __be32 net_seq)
807 {
808 }
809 
810 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
811 				     struct sk_buff *skb, u8 proto)
812 {
813 }
814 #endif /* CONFIG_AUDITSYSCALL */
815 
816 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
817 {
818 	if (likely(policy != NULL))
819 		refcount_inc(&policy->refcnt);
820 }
821 
822 void xfrm_policy_destroy(struct xfrm_policy *policy);
823 
824 static inline void xfrm_pol_put(struct xfrm_policy *policy)
825 {
826 	if (refcount_dec_and_test(&policy->refcnt))
827 		xfrm_policy_destroy(policy);
828 }
829 
830 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
831 {
832 	int i;
833 	for (i = npols - 1; i >= 0; --i)
834 		xfrm_pol_put(pols[i]);
835 }
836 
837 void __xfrm_state_destroy(struct xfrm_state *);
838 
839 static inline void __xfrm_state_put(struct xfrm_state *x)
840 {
841 	refcount_dec(&x->refcnt);
842 }
843 
844 static inline void xfrm_state_put(struct xfrm_state *x)
845 {
846 	if (refcount_dec_and_test(&x->refcnt))
847 		__xfrm_state_destroy(x);
848 }
849 
850 static inline void xfrm_state_hold(struct xfrm_state *x)
851 {
852 	refcount_inc(&x->refcnt);
853 }
854 
855 static inline bool addr_match(const void *token1, const void *token2,
856 			      unsigned int prefixlen)
857 {
858 	const __be32 *a1 = token1;
859 	const __be32 *a2 = token2;
860 	unsigned int pdw;
861 	unsigned int pbi;
862 
863 	pdw = prefixlen >> 5;	  /* num of whole u32 in prefix */
864 	pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
865 
866 	if (pdw)
867 		if (memcmp(a1, a2, pdw << 2))
868 			return false;
869 
870 	if (pbi) {
871 		__be32 mask;
872 
873 		mask = htonl((0xffffffff) << (32 - pbi));
874 
875 		if ((a1[pdw] ^ a2[pdw]) & mask)
876 			return false;
877 	}
878 
879 	return true;
880 }
881 
882 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
883 {
884 	/* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
885 	if (sizeof(long) == 4 && prefixlen == 0)
886 		return true;
887 	return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
888 }
889 
890 static __inline__
891 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
892 {
893 	__be16 port;
894 	switch(fl->flowi_proto) {
895 	case IPPROTO_TCP:
896 	case IPPROTO_UDP:
897 	case IPPROTO_UDPLITE:
898 	case IPPROTO_SCTP:
899 		port = uli->ports.sport;
900 		break;
901 	case IPPROTO_ICMP:
902 	case IPPROTO_ICMPV6:
903 		port = htons(uli->icmpt.type);
904 		break;
905 	case IPPROTO_MH:
906 		port = htons(uli->mht.type);
907 		break;
908 	case IPPROTO_GRE:
909 		port = htons(ntohl(uli->gre_key) >> 16);
910 		break;
911 	default:
912 		port = 0;	/*XXX*/
913 	}
914 	return port;
915 }
916 
917 static __inline__
918 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
919 {
920 	__be16 port;
921 	switch(fl->flowi_proto) {
922 	case IPPROTO_TCP:
923 	case IPPROTO_UDP:
924 	case IPPROTO_UDPLITE:
925 	case IPPROTO_SCTP:
926 		port = uli->ports.dport;
927 		break;
928 	case IPPROTO_ICMP:
929 	case IPPROTO_ICMPV6:
930 		port = htons(uli->icmpt.code);
931 		break;
932 	case IPPROTO_GRE:
933 		port = htons(ntohl(uli->gre_key) & 0xffff);
934 		break;
935 	default:
936 		port = 0;	/*XXX*/
937 	}
938 	return port;
939 }
940 
941 bool xfrm_selector_match(const struct xfrm_selector *sel,
942 			 const struct flowi *fl, unsigned short family);
943 
944 #ifdef CONFIG_SECURITY_NETWORK_XFRM
945 /*	If neither has a context --> match
946  * 	Otherwise, both must have a context and the sids, doi, alg must match
947  */
948 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
949 {
950 	return ((!s1 && !s2) ||
951 		(s1 && s2 &&
952 		 (s1->ctx_sid == s2->ctx_sid) &&
953 		 (s1->ctx_doi == s2->ctx_doi) &&
954 		 (s1->ctx_alg == s2->ctx_alg)));
955 }
956 #else
957 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
958 {
959 	return true;
960 }
961 #endif
962 
963 /* A struct encoding bundle of transformations to apply to some set of flow.
964  *
965  * dst->child points to the next element of bundle.
966  * dst->xfrm  points to an instanse of transformer.
967  *
968  * Due to unfortunate limitations of current routing cache, which we
969  * have no time to fix, it mirrors struct rtable and bound to the same
970  * routing key, including saddr,daddr. However, we can have many of
971  * bundles differing by session id. All the bundles grow from a parent
972  * policy rule.
973  */
974 struct xfrm_dst {
975 	union {
976 		struct dst_entry	dst;
977 		struct rtable		rt;
978 		struct rt6_info		rt6;
979 	} u;
980 	struct dst_entry *route;
981 	struct flow_cache_object flo;
982 	struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
983 	int num_pols, num_xfrms;
984 	u32 xfrm_genid;
985 	u32 policy_genid;
986 	u32 route_mtu_cached;
987 	u32 child_mtu_cached;
988 	u32 route_cookie;
989 	u32 path_cookie;
990 };
991 
992 #ifdef CONFIG_XFRM
993 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
994 {
995 	xfrm_pols_put(xdst->pols, xdst->num_pols);
996 	dst_release(xdst->route);
997 	if (likely(xdst->u.dst.xfrm))
998 		xfrm_state_put(xdst->u.dst.xfrm);
999 }
1000 #endif
1001 
1002 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1003 
1004 struct xfrm_offload {
1005 	/* Output sequence number for replay protection on offloading. */
1006 	struct {
1007 		__u32 low;
1008 		__u32 hi;
1009 	} seq;
1010 
1011 	__u32			flags;
1012 #define	SA_DELETE_REQ		1
1013 #define	CRYPTO_DONE		2
1014 #define	CRYPTO_NEXT_DONE	4
1015 #define	CRYPTO_FALLBACK		8
1016 #define	XFRM_GSO_SEGMENT	16
1017 #define	XFRM_GRO		32
1018 
1019 	__u32			status;
1020 #define CRYPTO_SUCCESS				1
1021 #define CRYPTO_GENERIC_ERROR			2
1022 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED		4
1023 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED	8
1024 #define CRYPTO_TUNNEL_AH_AUTH_FAILED		16
1025 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED		32
1026 #define CRYPTO_INVALID_PACKET_SYNTAX		64
1027 #define CRYPTO_INVALID_PROTOCOL			128
1028 
1029 	__u8			proto;
1030 };
1031 
1032 struct sec_path {
1033 	refcount_t		refcnt;
1034 	int			len;
1035 	int			olen;
1036 
1037 	struct xfrm_state	*xvec[XFRM_MAX_DEPTH];
1038 	struct xfrm_offload	ovec[XFRM_MAX_OFFLOAD_DEPTH];
1039 };
1040 
1041 static inline int secpath_exists(struct sk_buff *skb)
1042 {
1043 #ifdef CONFIG_XFRM
1044 	return skb->sp != NULL;
1045 #else
1046 	return 0;
1047 #endif
1048 }
1049 
1050 static inline struct sec_path *
1051 secpath_get(struct sec_path *sp)
1052 {
1053 	if (sp)
1054 		refcount_inc(&sp->refcnt);
1055 	return sp;
1056 }
1057 
1058 void __secpath_destroy(struct sec_path *sp);
1059 
1060 static inline void
1061 secpath_put(struct sec_path *sp)
1062 {
1063 	if (sp && refcount_dec_and_test(&sp->refcnt))
1064 		__secpath_destroy(sp);
1065 }
1066 
1067 struct sec_path *secpath_dup(struct sec_path *src);
1068 int secpath_set(struct sk_buff *skb);
1069 
1070 static inline void
1071 secpath_reset(struct sk_buff *skb)
1072 {
1073 #ifdef CONFIG_XFRM
1074 	secpath_put(skb->sp);
1075 	skb->sp = NULL;
1076 #endif
1077 }
1078 
1079 static inline int
1080 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1081 {
1082 	switch (family) {
1083 	case AF_INET:
1084 		return addr->a4 == 0;
1085 	case AF_INET6:
1086 		return ipv6_addr_any(&addr->in6);
1087 	}
1088 	return 0;
1089 }
1090 
1091 static inline int
1092 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1093 {
1094 	return	(tmpl->saddr.a4 &&
1095 		 tmpl->saddr.a4 != x->props.saddr.a4);
1096 }
1097 
1098 static inline int
1099 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1100 {
1101 	return	(!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1102 		 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1103 }
1104 
1105 static inline int
1106 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1107 {
1108 	switch (family) {
1109 	case AF_INET:
1110 		return __xfrm4_state_addr_cmp(tmpl, x);
1111 	case AF_INET6:
1112 		return __xfrm6_state_addr_cmp(tmpl, x);
1113 	}
1114 	return !0;
1115 }
1116 
1117 #ifdef CONFIG_XFRM
1118 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1119 			unsigned short family);
1120 
1121 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1122 				       struct sk_buff *skb,
1123 				       unsigned int family, int reverse)
1124 {
1125 	struct net *net = dev_net(skb->dev);
1126 	int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1127 
1128 	if (sk && sk->sk_policy[XFRM_POLICY_IN])
1129 		return __xfrm_policy_check(sk, ndir, skb, family);
1130 
1131 	return	(!net->xfrm.policy_count[dir] && !skb->sp) ||
1132 		(skb_dst(skb)->flags & DST_NOPOLICY) ||
1133 		__xfrm_policy_check(sk, ndir, skb, family);
1134 }
1135 
1136 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1137 {
1138 	return __xfrm_policy_check2(sk, dir, skb, family, 0);
1139 }
1140 
1141 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1142 {
1143 	return xfrm_policy_check(sk, dir, skb, AF_INET);
1144 }
1145 
1146 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1147 {
1148 	return xfrm_policy_check(sk, dir, skb, AF_INET6);
1149 }
1150 
1151 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1152 					     struct sk_buff *skb)
1153 {
1154 	return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1155 }
1156 
1157 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1158 					     struct sk_buff *skb)
1159 {
1160 	return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1161 }
1162 
1163 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1164 			  unsigned int family, int reverse);
1165 
1166 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1167 				      unsigned int family)
1168 {
1169 	return __xfrm_decode_session(skb, fl, family, 0);
1170 }
1171 
1172 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1173 					      struct flowi *fl,
1174 					      unsigned int family)
1175 {
1176 	return __xfrm_decode_session(skb, fl, family, 1);
1177 }
1178 
1179 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1180 
1181 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1182 {
1183 	struct net *net = dev_net(skb->dev);
1184 
1185 	return	!net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1186 		(skb_dst(skb)->flags & DST_NOXFRM) ||
1187 		__xfrm_route_forward(skb, family);
1188 }
1189 
1190 static inline int xfrm4_route_forward(struct sk_buff *skb)
1191 {
1192 	return xfrm_route_forward(skb, AF_INET);
1193 }
1194 
1195 static inline int xfrm6_route_forward(struct sk_buff *skb)
1196 {
1197 	return xfrm_route_forward(skb, AF_INET6);
1198 }
1199 
1200 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1201 
1202 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1203 {
1204 	sk->sk_policy[0] = NULL;
1205 	sk->sk_policy[1] = NULL;
1206 	if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1207 		return __xfrm_sk_clone_policy(sk, osk);
1208 	return 0;
1209 }
1210 
1211 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1212 
1213 static inline void xfrm_sk_free_policy(struct sock *sk)
1214 {
1215 	struct xfrm_policy *pol;
1216 
1217 	pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1218 	if (unlikely(pol != NULL)) {
1219 		xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1220 		sk->sk_policy[0] = NULL;
1221 	}
1222 	pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1223 	if (unlikely(pol != NULL)) {
1224 		xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1225 		sk->sk_policy[1] = NULL;
1226 	}
1227 }
1228 
1229 void xfrm_garbage_collect(struct net *net);
1230 void xfrm_garbage_collect_deferred(struct net *net);
1231 
1232 #else
1233 
1234 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1235 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1236 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1237 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1238 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1239 {
1240 	return 1;
1241 }
1242 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1243 {
1244 	return 1;
1245 }
1246 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1247 {
1248 	return 1;
1249 }
1250 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1251 					      struct flowi *fl,
1252 					      unsigned int family)
1253 {
1254 	return -ENOSYS;
1255 }
1256 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1257 					     struct sk_buff *skb)
1258 {
1259 	return 1;
1260 }
1261 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1262 					     struct sk_buff *skb)
1263 {
1264 	return 1;
1265 }
1266 static inline void xfrm_garbage_collect(struct net *net)
1267 {
1268 }
1269 #endif
1270 
1271 static __inline__
1272 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1273 {
1274 	switch (family){
1275 	case AF_INET:
1276 		return (xfrm_address_t *)&fl->u.ip4.daddr;
1277 	case AF_INET6:
1278 		return (xfrm_address_t *)&fl->u.ip6.daddr;
1279 	}
1280 	return NULL;
1281 }
1282 
1283 static __inline__
1284 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1285 {
1286 	switch (family){
1287 	case AF_INET:
1288 		return (xfrm_address_t *)&fl->u.ip4.saddr;
1289 	case AF_INET6:
1290 		return (xfrm_address_t *)&fl->u.ip6.saddr;
1291 	}
1292 	return NULL;
1293 }
1294 
1295 static __inline__
1296 void xfrm_flowi_addr_get(const struct flowi *fl,
1297 			 xfrm_address_t *saddr, xfrm_address_t *daddr,
1298 			 unsigned short family)
1299 {
1300 	switch(family) {
1301 	case AF_INET:
1302 		memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1303 		memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1304 		break;
1305 	case AF_INET6:
1306 		saddr->in6 = fl->u.ip6.saddr;
1307 		daddr->in6 = fl->u.ip6.daddr;
1308 		break;
1309 	}
1310 }
1311 
1312 static __inline__ int
1313 __xfrm4_state_addr_check(const struct xfrm_state *x,
1314 			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1315 {
1316 	if (daddr->a4 == x->id.daddr.a4 &&
1317 	    (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1318 		return 1;
1319 	return 0;
1320 }
1321 
1322 static __inline__ int
1323 __xfrm6_state_addr_check(const struct xfrm_state *x,
1324 			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1325 {
1326 	if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1327 	    (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1328 	     ipv6_addr_any((struct in6_addr *)saddr) ||
1329 	     ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1330 		return 1;
1331 	return 0;
1332 }
1333 
1334 static __inline__ int
1335 xfrm_state_addr_check(const struct xfrm_state *x,
1336 		      const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1337 		      unsigned short family)
1338 {
1339 	switch (family) {
1340 	case AF_INET:
1341 		return __xfrm4_state_addr_check(x, daddr, saddr);
1342 	case AF_INET6:
1343 		return __xfrm6_state_addr_check(x, daddr, saddr);
1344 	}
1345 	return 0;
1346 }
1347 
1348 static __inline__ int
1349 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1350 			   unsigned short family)
1351 {
1352 	switch (family) {
1353 	case AF_INET:
1354 		return __xfrm4_state_addr_check(x,
1355 						(const xfrm_address_t *)&fl->u.ip4.daddr,
1356 						(const xfrm_address_t *)&fl->u.ip4.saddr);
1357 	case AF_INET6:
1358 		return __xfrm6_state_addr_check(x,
1359 						(const xfrm_address_t *)&fl->u.ip6.daddr,
1360 						(const xfrm_address_t *)&fl->u.ip6.saddr);
1361 	}
1362 	return 0;
1363 }
1364 
1365 static inline int xfrm_state_kern(const struct xfrm_state *x)
1366 {
1367 	return atomic_read(&x->tunnel_users);
1368 }
1369 
1370 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1371 {
1372 	return (!userproto || proto == userproto ||
1373 		(userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1374 						  proto == IPPROTO_ESP ||
1375 						  proto == IPPROTO_COMP)));
1376 }
1377 
1378 /*
1379  * xfrm algorithm information
1380  */
1381 struct xfrm_algo_aead_info {
1382 	char *geniv;
1383 	u16 icv_truncbits;
1384 };
1385 
1386 struct xfrm_algo_auth_info {
1387 	u16 icv_truncbits;
1388 	u16 icv_fullbits;
1389 };
1390 
1391 struct xfrm_algo_encr_info {
1392 	char *geniv;
1393 	u16 blockbits;
1394 	u16 defkeybits;
1395 };
1396 
1397 struct xfrm_algo_comp_info {
1398 	u16 threshold;
1399 };
1400 
1401 struct xfrm_algo_desc {
1402 	char *name;
1403 	char *compat;
1404 	u8 available:1;
1405 	u8 pfkey_supported:1;
1406 	union {
1407 		struct xfrm_algo_aead_info aead;
1408 		struct xfrm_algo_auth_info auth;
1409 		struct xfrm_algo_encr_info encr;
1410 		struct xfrm_algo_comp_info comp;
1411 	} uinfo;
1412 	struct sadb_alg desc;
1413 };
1414 
1415 /* XFRM protocol handlers.  */
1416 struct xfrm4_protocol {
1417 	int (*handler)(struct sk_buff *skb);
1418 	int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1419 			     int encap_type);
1420 	int (*cb_handler)(struct sk_buff *skb, int err);
1421 	int (*err_handler)(struct sk_buff *skb, u32 info);
1422 
1423 	struct xfrm4_protocol __rcu *next;
1424 	int priority;
1425 };
1426 
1427 struct xfrm6_protocol {
1428 	int (*handler)(struct sk_buff *skb);
1429 	int (*cb_handler)(struct sk_buff *skb, int err);
1430 	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1431 			   u8 type, u8 code, int offset, __be32 info);
1432 
1433 	struct xfrm6_protocol __rcu *next;
1434 	int priority;
1435 };
1436 
1437 /* XFRM tunnel handlers.  */
1438 struct xfrm_tunnel {
1439 	int (*handler)(struct sk_buff *skb);
1440 	int (*err_handler)(struct sk_buff *skb, u32 info);
1441 
1442 	struct xfrm_tunnel __rcu *next;
1443 	int priority;
1444 };
1445 
1446 struct xfrm6_tunnel {
1447 	int (*handler)(struct sk_buff *skb);
1448 	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1449 			   u8 type, u8 code, int offset, __be32 info);
1450 	struct xfrm6_tunnel __rcu *next;
1451 	int priority;
1452 };
1453 
1454 void xfrm_init(void);
1455 void xfrm4_init(void);
1456 int xfrm_state_init(struct net *net);
1457 void xfrm_state_fini(struct net *net);
1458 void xfrm4_state_init(void);
1459 void xfrm4_protocol_init(void);
1460 #ifdef CONFIG_XFRM
1461 int xfrm6_init(void);
1462 void xfrm6_fini(void);
1463 int xfrm6_state_init(void);
1464 void xfrm6_state_fini(void);
1465 int xfrm6_protocol_init(void);
1466 void xfrm6_protocol_fini(void);
1467 #else
1468 static inline int xfrm6_init(void)
1469 {
1470 	return 0;
1471 }
1472 static inline void xfrm6_fini(void)
1473 {
1474 	;
1475 }
1476 #endif
1477 
1478 #ifdef CONFIG_XFRM_STATISTICS
1479 int xfrm_proc_init(struct net *net);
1480 void xfrm_proc_fini(struct net *net);
1481 #endif
1482 
1483 int xfrm_sysctl_init(struct net *net);
1484 #ifdef CONFIG_SYSCTL
1485 void xfrm_sysctl_fini(struct net *net);
1486 #else
1487 static inline void xfrm_sysctl_fini(struct net *net)
1488 {
1489 }
1490 #endif
1491 
1492 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1493 			  struct xfrm_address_filter *filter);
1494 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1495 		    int (*func)(struct xfrm_state *, int, void*), void *);
1496 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1497 struct xfrm_state *xfrm_state_alloc(struct net *net);
1498 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1499 				   const xfrm_address_t *saddr,
1500 				   const struct flowi *fl,
1501 				   struct xfrm_tmpl *tmpl,
1502 				   struct xfrm_policy *pol, int *err,
1503 				   unsigned short family);
1504 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1505 				       xfrm_address_t *daddr,
1506 				       xfrm_address_t *saddr,
1507 				       unsigned short family,
1508 				       u8 mode, u8 proto, u32 reqid);
1509 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1510 					      unsigned short family);
1511 int xfrm_state_check_expire(struct xfrm_state *x);
1512 void xfrm_state_insert(struct xfrm_state *x);
1513 int xfrm_state_add(struct xfrm_state *x);
1514 int xfrm_state_update(struct xfrm_state *x);
1515 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1516 				     const xfrm_address_t *daddr, __be32 spi,
1517 				     u8 proto, unsigned short family);
1518 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1519 					    const xfrm_address_t *daddr,
1520 					    const xfrm_address_t *saddr,
1521 					    u8 proto,
1522 					    unsigned short family);
1523 #ifdef CONFIG_XFRM_SUB_POLICY
1524 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1525 		   unsigned short family, struct net *net);
1526 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1527 		    unsigned short family);
1528 #else
1529 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1530 				 int n, unsigned short family, struct net *net)
1531 {
1532 	return -ENOSYS;
1533 }
1534 
1535 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1536 				  int n, unsigned short family)
1537 {
1538 	return -ENOSYS;
1539 }
1540 #endif
1541 
1542 struct xfrmk_sadinfo {
1543 	u32 sadhcnt; /* current hash bkts */
1544 	u32 sadhmcnt; /* max allowed hash bkts */
1545 	u32 sadcnt; /* current running count */
1546 };
1547 
1548 struct xfrmk_spdinfo {
1549 	u32 incnt;
1550 	u32 outcnt;
1551 	u32 fwdcnt;
1552 	u32 inscnt;
1553 	u32 outscnt;
1554 	u32 fwdscnt;
1555 	u32 spdhcnt;
1556 	u32 spdhmcnt;
1557 };
1558 
1559 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1560 int xfrm_state_delete(struct xfrm_state *x);
1561 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1562 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1563 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1564 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1565 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1566 int xfrm_init_replay(struct xfrm_state *x);
1567 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1568 int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1569 int xfrm_init_state(struct xfrm_state *x);
1570 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1571 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1572 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1573 int xfrm_output_resume(struct sk_buff *skb, int err);
1574 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1575 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1576 void xfrm_local_error(struct sk_buff *skb, int mtu);
1577 int xfrm4_extract_header(struct sk_buff *skb);
1578 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1579 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1580 		    int encap_type);
1581 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1582 int xfrm4_rcv(struct sk_buff *skb);
1583 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1584 
1585 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1586 {
1587 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1588 	XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1589 	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1590 	return xfrm_input(skb, nexthdr, spi, 0);
1591 }
1592 
1593 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1594 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1595 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1596 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1597 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1598 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1599 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1600 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1601 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1602 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1603 int xfrm6_extract_header(struct sk_buff *skb);
1604 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1605 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1606 		  struct ip6_tnl *t);
1607 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1608 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1609 int xfrm6_rcv(struct sk_buff *skb);
1610 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1611 		     xfrm_address_t *saddr, u8 proto);
1612 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1613 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1614 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1615 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1616 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1617 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1618 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1619 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1620 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1621 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1622 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1623 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1624 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1625 			  u8 **prevhdr);
1626 
1627 #ifdef CONFIG_XFRM
1628 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1629 int xfrm_user_policy(struct sock *sk, int optname,
1630 		     u8 __user *optval, int optlen);
1631 #else
1632 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1633 {
1634  	return -ENOPROTOOPT;
1635 }
1636 
1637 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1638 {
1639  	/* should not happen */
1640  	kfree_skb(skb);
1641 	return 0;
1642 }
1643 #endif
1644 
1645 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1646 				    const xfrm_address_t *saddr,
1647 				    const xfrm_address_t *daddr,
1648 				    int family);
1649 
1650 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1651 
1652 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1653 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1654 		     int (*func)(struct xfrm_policy *, int, int, void*),
1655 		     void *);
1656 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1657 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1658 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1659 					  u8 type, int dir,
1660 					  struct xfrm_selector *sel,
1661 					  struct xfrm_sec_ctx *ctx, int delete,
1662 					  int *err);
1663 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1664 				     u32 id, int delete, int *err);
1665 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1666 void xfrm_policy_hash_rebuild(struct net *net);
1667 u32 xfrm_get_acqseq(void);
1668 int verify_spi_info(u8 proto, u32 min, u32 max);
1669 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1670 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1671 				 u8 mode, u32 reqid, u8 proto,
1672 				 const xfrm_address_t *daddr,
1673 				 const xfrm_address_t *saddr, int create,
1674 				 unsigned short family);
1675 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1676 
1677 #ifdef CONFIG_XFRM_MIGRATE
1678 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1679 	       const struct xfrm_migrate *m, int num_bundles,
1680 	       const struct xfrm_kmaddress *k,
1681 	       const struct xfrm_encap_tmpl *encap);
1682 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1683 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1684 				      struct xfrm_migrate *m,
1685 				      struct xfrm_encap_tmpl *encap);
1686 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1687 		 struct xfrm_migrate *m, int num_bundles,
1688 		 struct xfrm_kmaddress *k, struct net *net,
1689 		 struct xfrm_encap_tmpl *encap);
1690 #endif
1691 
1692 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1693 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1694 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1695 	      xfrm_address_t *addr);
1696 
1697 void xfrm_input_init(void);
1698 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1699 
1700 void xfrm_probe_algs(void);
1701 int xfrm_count_pfkey_auth_supported(void);
1702 int xfrm_count_pfkey_enc_supported(void);
1703 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1704 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1705 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1706 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1707 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1708 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1709 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1710 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1711 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1712 					    int probe);
1713 
1714 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1715 				    const xfrm_address_t *b)
1716 {
1717 	return ipv6_addr_equal((const struct in6_addr *)a,
1718 			       (const struct in6_addr *)b);
1719 }
1720 
1721 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1722 				   const xfrm_address_t *b,
1723 				   sa_family_t family)
1724 {
1725 	switch (family) {
1726 	default:
1727 	case AF_INET:
1728 		return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1729 	case AF_INET6:
1730 		return xfrm6_addr_equal(a, b);
1731 	}
1732 }
1733 
1734 static inline int xfrm_policy_id2dir(u32 index)
1735 {
1736 	return index & 7;
1737 }
1738 
1739 #ifdef CONFIG_XFRM
1740 static inline int xfrm_aevent_is_on(struct net *net)
1741 {
1742 	struct sock *nlsk;
1743 	int ret = 0;
1744 
1745 	rcu_read_lock();
1746 	nlsk = rcu_dereference(net->xfrm.nlsk);
1747 	if (nlsk)
1748 		ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1749 	rcu_read_unlock();
1750 	return ret;
1751 }
1752 
1753 static inline int xfrm_acquire_is_on(struct net *net)
1754 {
1755 	struct sock *nlsk;
1756 	int ret = 0;
1757 
1758 	rcu_read_lock();
1759 	nlsk = rcu_dereference(net->xfrm.nlsk);
1760 	if (nlsk)
1761 		ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1762 	rcu_read_unlock();
1763 
1764 	return ret;
1765 }
1766 #endif
1767 
1768 static inline int aead_len(struct xfrm_algo_aead *alg)
1769 {
1770 	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1771 }
1772 
1773 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1774 {
1775 	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1776 }
1777 
1778 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1779 {
1780 	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1781 }
1782 
1783 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1784 {
1785 	return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1786 }
1787 
1788 #ifdef CONFIG_XFRM_MIGRATE
1789 static inline int xfrm_replay_clone(struct xfrm_state *x,
1790 				     struct xfrm_state *orig)
1791 {
1792 	x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1793 				GFP_KERNEL);
1794 	if (!x->replay_esn)
1795 		return -ENOMEM;
1796 
1797 	x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1798 	x->replay_esn->replay_window = orig->replay_esn->replay_window;
1799 
1800 	x->preplay_esn = kmemdup(x->replay_esn,
1801 				 xfrm_replay_state_esn_len(x->replay_esn),
1802 				 GFP_KERNEL);
1803 	if (!x->preplay_esn) {
1804 		kfree(x->replay_esn);
1805 		return -ENOMEM;
1806 	}
1807 
1808 	return 0;
1809 }
1810 
1811 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1812 {
1813 	return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1814 }
1815 
1816 
1817 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1818 {
1819 	return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1820 }
1821 
1822 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1823 {
1824 	return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1825 }
1826 
1827 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1828 {
1829 	int i;
1830 	for (i = 0; i < n; i++)
1831 		xfrm_state_put(*(states + i));
1832 }
1833 
1834 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1835 {
1836 	int i;
1837 	for (i = 0; i < n; i++)
1838 		xfrm_state_delete(*(states + i));
1839 }
1840 #endif
1841 
1842 #ifdef CONFIG_XFRM
1843 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1844 {
1845 	return skb->sp->xvec[skb->sp->len - 1];
1846 }
1847 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1848 {
1849 	struct sec_path *sp = skb->sp;
1850 
1851 	if (!sp || !sp->olen || sp->len != sp->olen)
1852 		return NULL;
1853 
1854 	return &sp->ovec[sp->olen - 1];
1855 }
1856 #endif
1857 
1858 void __net_init xfrm_dev_init(void);
1859 
1860 #ifdef CONFIG_XFRM_OFFLOAD
1861 int validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features);
1862 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1863 		       struct xfrm_user_offload *xuo);
1864 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1865 
1866 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1867 {
1868 	struct xfrm_state_offload *xso = &x->xso;
1869 
1870 	if (xso->dev)
1871 		xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1872 }
1873 
1874 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1875 {
1876 	struct xfrm_state_offload *xso = &x->xso;
1877 	 struct net_device *dev = xso->dev;
1878 
1879 	if (dev && dev->xfrmdev_ops) {
1880 		dev->xfrmdev_ops->xdo_dev_state_free(x);
1881 		xso->dev = NULL;
1882 		dev_put(dev);
1883 	}
1884 }
1885 #else
1886 static inline int validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features)
1887 {
1888 	return 0;
1889 }
1890 
1891 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1892 {
1893 	return 0;
1894 }
1895 
1896 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1897 {
1898 }
1899 
1900 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1901 {
1902 }
1903 
1904 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1905 {
1906 	return false;
1907 }
1908 #endif
1909 
1910 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1911 {
1912 	if (attrs[XFRMA_MARK])
1913 		memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1914 	else
1915 		m->v = m->m = 0;
1916 
1917 	return m->v & m->m;
1918 }
1919 
1920 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1921 {
1922 	int ret = 0;
1923 
1924 	if (m->m | m->v)
1925 		ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1926 	return ret;
1927 }
1928 
1929 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1930 				    unsigned int family)
1931 {
1932 	bool tunnel = false;
1933 
1934 	switch(family) {
1935 	case AF_INET:
1936 		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1937 			tunnel = true;
1938 		break;
1939 	case AF_INET6:
1940 		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1941 			tunnel = true;
1942 		break;
1943 	}
1944 	if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1945 		return -EINVAL;
1946 
1947 	return 0;
1948 }
1949 #endif	/* _NET_XFRM_H */
1950