1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NET_XFRM_H
3 #define _NET_XFRM_H
4 
5 #include <linux/compiler.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 #include <linux/audit.h>
16 #include <linux/slab.h>
17 #include <linux/refcount.h>
18 #include <linux/sockptr.h>
19 
20 #include <net/sock.h>
21 #include <net/dst.h>
22 #include <net/ip.h>
23 #include <net/route.h>
24 #include <net/ipv6.h>
25 #include <net/ip6_fib.h>
26 #include <net/flow.h>
27 #include <net/gro_cells.h>
28 
29 #include <linux/interrupt.h>
30 
31 #ifdef CONFIG_XFRM_STATISTICS
32 #include <net/snmp.h>
33 #endif
34 
35 #define XFRM_PROTO_ESP		50
36 #define XFRM_PROTO_AH		51
37 #define XFRM_PROTO_COMP		108
38 #define XFRM_PROTO_IPIP		4
39 #define XFRM_PROTO_IPV6		41
40 #define XFRM_PROTO_ROUTING	IPPROTO_ROUTING
41 #define XFRM_PROTO_DSTOPTS	IPPROTO_DSTOPTS
42 
43 #define XFRM_ALIGN4(len)	(((len) + 3) & ~3)
44 #define XFRM_ALIGN8(len)	(((len) + 7) & ~7)
45 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
46 	MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
47 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
48 	MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
49 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
50 	MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
51 
52 #ifdef CONFIG_XFRM_STATISTICS
53 #define XFRM_INC_STATS(net, field)	SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
54 #else
55 #define XFRM_INC_STATS(net, field)	((void)(net))
56 #endif
57 
58 
59 /* Organization of SPD aka "XFRM rules"
60    ------------------------------------
61 
62    Basic objects:
63    - policy rule, struct xfrm_policy (=SPD entry)
64    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65    - instance of a transformer, struct xfrm_state (=SA)
66    - template to clone xfrm_state, struct xfrm_tmpl
67 
68    SPD is plain linear list of xfrm_policy rules, ordered by priority.
69    (To be compatible with existing pfkeyv2 implementations,
70    many rules with priority of 0x7fffffff are allowed to exist and
71    such rules are ordered in an unpredictable way, thanks to bsd folks.)
72 
73    Lookup is plain linear search until the first match with selector.
74 
75    If "action" is "block", then we prohibit the flow, otherwise:
76    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77    policy entry has list of up to XFRM_MAX_DEPTH transformations,
78    described by templates xfrm_tmpl. Each template is resolved
79    to a complete xfrm_state (see below) and we pack bundle of transformations
80    to a dst_entry returned to requestor.
81 
82    dst -. xfrm  .-> xfrm_state #1
83     |---. child .-> dst -. xfrm .-> xfrm_state #2
84                      |---. child .-> dst -. xfrm .-> xfrm_state #3
85                                       |---. child .-> NULL
86 
87    Bundles are cached at xrfm_policy struct (field ->bundles).
88 
89 
90    Resolution of xrfm_tmpl
91    -----------------------
92    Template contains:
93    1. ->mode		Mode: transport or tunnel
94    2. ->id.proto	Protocol: AH/ESP/IPCOMP
95    3. ->id.daddr	Remote tunnel endpoint, ignored for transport mode.
96       Q: allow to resolve security gateway?
97    4. ->id.spi          If not zero, static SPI.
98    5. ->saddr		Local tunnel endpoint, ignored for transport mode.
99    6. ->algos		List of allowed algos. Plain bitmask now.
100       Q: ealgos, aalgos, calgos. What a mess...
101    7. ->share		Sharing mode.
102       Q: how to implement private sharing mode? To add struct sock* to
103       flow id?
104 
105    Having this template we search through SAD searching for entries
106    with appropriate mode/proto/algo, permitted by selector.
107    If no appropriate entry found, it is requested from key manager.
108 
109    PROBLEMS:
110    Q: How to find all the bundles referring to a physical path for
111       PMTU discovery? Seems, dst should contain list of all parents...
112       and enter to infinite locking hierarchy disaster.
113       No! It is easier, we will not search for them, let them find us.
114       We add genid to each dst plus pointer to genid of raw IP route,
115       pmtu disc will update pmtu on raw IP route and increase its genid.
116       dst_check() will see this for top level and trigger resyncing
117       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
118  */
119 
120 struct xfrm_state_walk {
121 	struct list_head	all;
122 	u8			state;
123 	u8			dying;
124 	u8			proto;
125 	u32			seq;
126 	struct xfrm_address_filter *filter;
127 };
128 
129 enum {
130 	XFRM_DEV_OFFLOAD_IN = 1,
131 	XFRM_DEV_OFFLOAD_OUT,
132 };
133 
134 struct xfrm_dev_offload {
135 	struct net_device	*dev;
136 	netdevice_tracker	dev_tracker;
137 	struct net_device	*real_dev;
138 	unsigned long		offload_handle;
139 	u8			dir : 2;
140 };
141 
142 struct xfrm_mode {
143 	u8 encap;
144 	u8 family;
145 	u8 flags;
146 };
147 
148 /* Flags for xfrm_mode. */
149 enum {
150 	XFRM_MODE_FLAG_TUNNEL = 1,
151 };
152 
153 enum xfrm_replay_mode {
154 	XFRM_REPLAY_MODE_LEGACY,
155 	XFRM_REPLAY_MODE_BMP,
156 	XFRM_REPLAY_MODE_ESN,
157 };
158 
159 /* Full description of state of transformer. */
160 struct xfrm_state {
161 	possible_net_t		xs_net;
162 	union {
163 		struct hlist_node	gclist;
164 		struct hlist_node	bydst;
165 	};
166 	struct hlist_node	bysrc;
167 	struct hlist_node	byspi;
168 	struct hlist_node	byseq;
169 
170 	refcount_t		refcnt;
171 	spinlock_t		lock;
172 
173 	struct xfrm_id		id;
174 	struct xfrm_selector	sel;
175 	struct xfrm_mark	mark;
176 	u32			if_id;
177 	u32			tfcpad;
178 
179 	u32			genid;
180 
181 	/* Key manager bits */
182 	struct xfrm_state_walk	km;
183 
184 	/* Parameters of this state. */
185 	struct {
186 		u32		reqid;
187 		u8		mode;
188 		u8		replay_window;
189 		u8		aalgo, ealgo, calgo;
190 		u8		flags;
191 		u16		family;
192 		xfrm_address_t	saddr;
193 		int		header_len;
194 		int		trailer_len;
195 		u32		extra_flags;
196 		struct xfrm_mark	smark;
197 	} props;
198 
199 	struct xfrm_lifetime_cfg lft;
200 
201 	/* Data for transformer */
202 	struct xfrm_algo_auth	*aalg;
203 	struct xfrm_algo	*ealg;
204 	struct xfrm_algo	*calg;
205 	struct xfrm_algo_aead	*aead;
206 	const char		*geniv;
207 
208 	/* mapping change rate limiting */
209 	__be16 new_mapping_sport;
210 	u32 new_mapping;	/* seconds */
211 	u32 mapping_maxage;	/* seconds for input SA */
212 
213 	/* Data for encapsulator */
214 	struct xfrm_encap_tmpl	*encap;
215 	struct sock __rcu	*encap_sk;
216 
217 	/* Data for care-of address */
218 	xfrm_address_t	*coaddr;
219 
220 	/* IPComp needs an IPIP tunnel for handling uncompressed packets */
221 	struct xfrm_state	*tunnel;
222 
223 	/* If a tunnel, number of users + 1 */
224 	atomic_t		tunnel_users;
225 
226 	/* State for replay detection */
227 	struct xfrm_replay_state replay;
228 	struct xfrm_replay_state_esn *replay_esn;
229 
230 	/* Replay detection state at the time we sent the last notification */
231 	struct xfrm_replay_state preplay;
232 	struct xfrm_replay_state_esn *preplay_esn;
233 
234 	/* replay detection mode */
235 	enum xfrm_replay_mode    repl_mode;
236 	/* internal flag that only holds state for delayed aevent at the
237 	 * moment
238 	*/
239 	u32			xflags;
240 
241 	/* Replay detection notification settings */
242 	u32			replay_maxage;
243 	u32			replay_maxdiff;
244 
245 	/* Replay detection notification timer */
246 	struct timer_list	rtimer;
247 
248 	/* Statistics */
249 	struct xfrm_stats	stats;
250 
251 	struct xfrm_lifetime_cur curlft;
252 	struct hrtimer		mtimer;
253 
254 	struct xfrm_dev_offload xso;
255 
256 	/* used to fix curlft->add_time when changing date */
257 	long		saved_tmo;
258 
259 	/* Last used time */
260 	time64_t		lastused;
261 
262 	struct page_frag xfrag;
263 
264 	/* Reference to data common to all the instances of this
265 	 * transformer. */
266 	const struct xfrm_type	*type;
267 	struct xfrm_mode	inner_mode;
268 	struct xfrm_mode	inner_mode_iaf;
269 	struct xfrm_mode	outer_mode;
270 
271 	const struct xfrm_type_offload	*type_offload;
272 
273 	/* Security context */
274 	struct xfrm_sec_ctx	*security;
275 
276 	/* Private data of this transformer, format is opaque,
277 	 * interpreted by xfrm_type methods. */
278 	void			*data;
279 };
280 
xs_net(struct xfrm_state * x)281 static inline struct net *xs_net(struct xfrm_state *x)
282 {
283 	return read_pnet(&x->xs_net);
284 }
285 
286 /* xflags - make enum if more show up */
287 #define XFRM_TIME_DEFER	1
288 #define XFRM_SOFT_EXPIRE 2
289 
290 enum {
291 	XFRM_STATE_VOID,
292 	XFRM_STATE_ACQ,
293 	XFRM_STATE_VALID,
294 	XFRM_STATE_ERROR,
295 	XFRM_STATE_EXPIRED,
296 	XFRM_STATE_DEAD
297 };
298 
299 /* callback structure passed from either netlink or pfkey */
300 struct km_event {
301 	union {
302 		u32 hard;
303 		u32 proto;
304 		u32 byid;
305 		u32 aevent;
306 		u32 type;
307 	} data;
308 
309 	u32	seq;
310 	u32	portid;
311 	u32	event;
312 	struct net *net;
313 };
314 
315 struct xfrm_if_decode_session_result {
316 	struct net *net;
317 	u32 if_id;
318 };
319 
320 struct xfrm_if_cb {
321 	bool (*decode_session)(struct sk_buff *skb,
322 			       unsigned short family,
323 			       struct xfrm_if_decode_session_result *res);
324 };
325 
326 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
327 void xfrm_if_unregister_cb(void);
328 
329 struct net_device;
330 struct xfrm_type;
331 struct xfrm_dst;
332 struct xfrm_policy_afinfo {
333 	struct dst_ops		*dst_ops;
334 	struct dst_entry	*(*dst_lookup)(struct net *net,
335 					       int tos, int oif,
336 					       const xfrm_address_t *saddr,
337 					       const xfrm_address_t *daddr,
338 					       u32 mark);
339 	int			(*get_saddr)(struct net *net, int oif,
340 					     xfrm_address_t *saddr,
341 					     xfrm_address_t *daddr,
342 					     u32 mark);
343 	int			(*fill_dst)(struct xfrm_dst *xdst,
344 					    struct net_device *dev,
345 					    const struct flowi *fl);
346 	struct dst_entry	*(*blackhole_route)(struct net *net, struct dst_entry *orig);
347 };
348 
349 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
350 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
351 void km_policy_notify(struct xfrm_policy *xp, int dir,
352 		      const struct km_event *c);
353 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
354 
355 struct xfrm_tmpl;
356 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
357 	     struct xfrm_policy *pol);
358 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
359 int __xfrm_state_delete(struct xfrm_state *x);
360 
361 struct xfrm_state_afinfo {
362 	u8				family;
363 	u8				proto;
364 
365 	const struct xfrm_type_offload *type_offload_esp;
366 
367 	const struct xfrm_type		*type_esp;
368 	const struct xfrm_type		*type_ipip;
369 	const struct xfrm_type		*type_ipip6;
370 	const struct xfrm_type		*type_comp;
371 	const struct xfrm_type		*type_ah;
372 	const struct xfrm_type		*type_routing;
373 	const struct xfrm_type		*type_dstopts;
374 
375 	int			(*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
376 	int			(*transport_finish)(struct sk_buff *skb,
377 						    int async);
378 	void			(*local_error)(struct sk_buff *skb, u32 mtu);
379 };
380 
381 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
382 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
383 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
384 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
385 
386 struct xfrm_input_afinfo {
387 	u8			family;
388 	bool			is_ipip;
389 	int			(*callback)(struct sk_buff *skb, u8 protocol,
390 					    int err);
391 };
392 
393 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
394 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
395 
396 void xfrm_flush_gc(void);
397 void xfrm_state_delete_tunnel(struct xfrm_state *x);
398 
399 struct xfrm_type {
400 	struct module		*owner;
401 	u8			proto;
402 	u8			flags;
403 #define XFRM_TYPE_NON_FRAGMENT	1
404 #define XFRM_TYPE_REPLAY_PROT	2
405 #define XFRM_TYPE_LOCAL_COADDR	4
406 #define XFRM_TYPE_REMOTE_COADDR	8
407 
408 	int			(*init_state)(struct xfrm_state *x,
409 					      struct netlink_ext_ack *extack);
410 	void			(*destructor)(struct xfrm_state *);
411 	int			(*input)(struct xfrm_state *, struct sk_buff *skb);
412 	int			(*output)(struct xfrm_state *, struct sk_buff *pskb);
413 	int			(*reject)(struct xfrm_state *, struct sk_buff *,
414 					  const struct flowi *);
415 };
416 
417 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
418 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
419 
420 struct xfrm_type_offload {
421 	struct module	*owner;
422 	u8		proto;
423 	void		(*encap)(struct xfrm_state *, struct sk_buff *pskb);
424 	int		(*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
425 	int		(*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
426 };
427 
428 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
429 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
430 
xfrm_af2proto(unsigned int family)431 static inline int xfrm_af2proto(unsigned int family)
432 {
433 	switch(family) {
434 	case AF_INET:
435 		return IPPROTO_IPIP;
436 	case AF_INET6:
437 		return IPPROTO_IPV6;
438 	default:
439 		return 0;
440 	}
441 }
442 
xfrm_ip2inner_mode(struct xfrm_state * x,int ipproto)443 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
444 {
445 	if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
446 	    (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
447 		return &x->inner_mode;
448 	else
449 		return &x->inner_mode_iaf;
450 }
451 
452 struct xfrm_tmpl {
453 /* id in template is interpreted as:
454  * daddr - destination of tunnel, may be zero for transport mode.
455  * spi   - zero to acquire spi. Not zero if spi is static, then
456  *	   daddr must be fixed too.
457  * proto - AH/ESP/IPCOMP
458  */
459 	struct xfrm_id		id;
460 
461 /* Source address of tunnel. Ignored, if it is not a tunnel. */
462 	xfrm_address_t		saddr;
463 
464 	unsigned short		encap_family;
465 
466 	u32			reqid;
467 
468 /* Mode: transport, tunnel etc. */
469 	u8			mode;
470 
471 /* Sharing mode: unique, this session only, this user only etc. */
472 	u8			share;
473 
474 /* May skip this transfomration if no SA is found */
475 	u8			optional;
476 
477 /* Skip aalgos/ealgos/calgos checks. */
478 	u8			allalgs;
479 
480 /* Bit mask of algos allowed for acquisition */
481 	u32			aalgos;
482 	u32			ealgos;
483 	u32			calgos;
484 };
485 
486 #define XFRM_MAX_DEPTH		6
487 #define XFRM_MAX_OFFLOAD_DEPTH	1
488 
489 struct xfrm_policy_walk_entry {
490 	struct list_head	all;
491 	u8			dead;
492 };
493 
494 struct xfrm_policy_walk {
495 	struct xfrm_policy_walk_entry walk;
496 	u8 type;
497 	u32 seq;
498 };
499 
500 struct xfrm_policy_queue {
501 	struct sk_buff_head	hold_queue;
502 	struct timer_list	hold_timer;
503 	unsigned long		timeout;
504 };
505 
506 struct xfrm_policy {
507 	possible_net_t		xp_net;
508 	struct hlist_node	bydst;
509 	struct hlist_node	byidx;
510 
511 	/* This lock only affects elements except for entry. */
512 	rwlock_t		lock;
513 	refcount_t		refcnt;
514 	u32			pos;
515 	struct timer_list	timer;
516 
517 	atomic_t		genid;
518 	u32			priority;
519 	u32			index;
520 	u32			if_id;
521 	struct xfrm_mark	mark;
522 	struct xfrm_selector	selector;
523 	struct xfrm_lifetime_cfg lft;
524 	struct xfrm_lifetime_cur curlft;
525 	struct xfrm_policy_walk_entry walk;
526 	struct xfrm_policy_queue polq;
527 	bool                    bydst_reinsert;
528 	u8			type;
529 	u8			action;
530 	u8			flags;
531 	u8			xfrm_nr;
532 	u16			family;
533 	struct xfrm_sec_ctx	*security;
534 	struct xfrm_tmpl       	xfrm_vec[XFRM_MAX_DEPTH];
535 	struct hlist_node	bydst_inexact_list;
536 	struct rcu_head		rcu;
537 };
538 
xp_net(const struct xfrm_policy * xp)539 static inline struct net *xp_net(const struct xfrm_policy *xp)
540 {
541 	return read_pnet(&xp->xp_net);
542 }
543 
544 struct xfrm_kmaddress {
545 	xfrm_address_t          local;
546 	xfrm_address_t          remote;
547 	u32			reserved;
548 	u16			family;
549 };
550 
551 struct xfrm_migrate {
552 	xfrm_address_t		old_daddr;
553 	xfrm_address_t		old_saddr;
554 	xfrm_address_t		new_daddr;
555 	xfrm_address_t		new_saddr;
556 	u8			proto;
557 	u8			mode;
558 	u16			reserved;
559 	u32			reqid;
560 	u16			old_family;
561 	u16			new_family;
562 };
563 
564 #define XFRM_KM_TIMEOUT                30
565 /* what happened */
566 #define XFRM_REPLAY_UPDATE	XFRM_AE_CR
567 #define XFRM_REPLAY_TIMEOUT	XFRM_AE_CE
568 
569 /* default aevent timeout in units of 100ms */
570 #define XFRM_AE_ETIME			10
571 /* Async Event timer multiplier */
572 #define XFRM_AE_ETH_M			10
573 /* default seq threshold size */
574 #define XFRM_AE_SEQT_SIZE		2
575 
576 struct xfrm_mgr {
577 	struct list_head	list;
578 	int			(*notify)(struct xfrm_state *x, const struct km_event *c);
579 	int			(*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
580 	struct xfrm_policy	*(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
581 	int			(*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
582 	int			(*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
583 	int			(*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
584 	int			(*migrate)(const struct xfrm_selector *sel,
585 					   u8 dir, u8 type,
586 					   const struct xfrm_migrate *m,
587 					   int num_bundles,
588 					   const struct xfrm_kmaddress *k,
589 					   const struct xfrm_encap_tmpl *encap);
590 	bool			(*is_alive)(const struct km_event *c);
591 };
592 
593 void xfrm_register_km(struct xfrm_mgr *km);
594 void xfrm_unregister_km(struct xfrm_mgr *km);
595 
596 struct xfrm_tunnel_skb_cb {
597 	union {
598 		struct inet_skb_parm h4;
599 		struct inet6_skb_parm h6;
600 	} header;
601 
602 	union {
603 		struct ip_tunnel *ip4;
604 		struct ip6_tnl *ip6;
605 	} tunnel;
606 };
607 
608 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
609 
610 /*
611  * This structure is used for the duration where packets are being
612  * transformed by IPsec.  As soon as the packet leaves IPsec the
613  * area beyond the generic IP part may be overwritten.
614  */
615 struct xfrm_skb_cb {
616 	struct xfrm_tunnel_skb_cb header;
617 
618         /* Sequence number for replay protection. */
619 	union {
620 		struct {
621 			__u32 low;
622 			__u32 hi;
623 		} output;
624 		struct {
625 			__be32 low;
626 			__be32 hi;
627 		} input;
628 	} seq;
629 };
630 
631 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
632 
633 /*
634  * This structure is used by the afinfo prepare_input/prepare_output functions
635  * to transmit header information to the mode input/output functions.
636  */
637 struct xfrm_mode_skb_cb {
638 	struct xfrm_tunnel_skb_cb header;
639 
640 	/* Copied from header for IPv4, always set to zero and DF for IPv6. */
641 	__be16 id;
642 	__be16 frag_off;
643 
644 	/* IP header length (excluding options or extension headers). */
645 	u8 ihl;
646 
647 	/* TOS for IPv4, class for IPv6. */
648 	u8 tos;
649 
650 	/* TTL for IPv4, hop limitfor IPv6. */
651 	u8 ttl;
652 
653 	/* Protocol for IPv4, NH for IPv6. */
654 	u8 protocol;
655 
656 	/* Option length for IPv4, zero for IPv6. */
657 	u8 optlen;
658 
659 	/* Used by IPv6 only, zero for IPv4. */
660 	u8 flow_lbl[3];
661 };
662 
663 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
664 
665 /*
666  * This structure is used by the input processing to locate the SPI and
667  * related information.
668  */
669 struct xfrm_spi_skb_cb {
670 	struct xfrm_tunnel_skb_cb header;
671 
672 	unsigned int daddroff;
673 	unsigned int family;
674 	__be32 seq;
675 };
676 
677 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
678 
679 #ifdef CONFIG_AUDITSYSCALL
xfrm_audit_start(const char * op)680 static inline struct audit_buffer *xfrm_audit_start(const char *op)
681 {
682 	struct audit_buffer *audit_buf = NULL;
683 
684 	if (audit_enabled == AUDIT_OFF)
685 		return NULL;
686 	audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
687 				    AUDIT_MAC_IPSEC_EVENT);
688 	if (audit_buf == NULL)
689 		return NULL;
690 	audit_log_format(audit_buf, "op=%s", op);
691 	return audit_buf;
692 }
693 
xfrm_audit_helper_usrinfo(bool task_valid,struct audit_buffer * audit_buf)694 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
695 					     struct audit_buffer *audit_buf)
696 {
697 	const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
698 					    audit_get_loginuid(current) :
699 					    INVALID_UID);
700 	const unsigned int ses = task_valid ? audit_get_sessionid(current) :
701 		AUDIT_SID_UNSET;
702 
703 	audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
704 	audit_log_task_context(audit_buf);
705 }
706 
707 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
708 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
709 			      bool task_valid);
710 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
711 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
712 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
713 				      struct sk_buff *skb);
714 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
715 			     __be32 net_seq);
716 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
717 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
718 			       __be32 net_seq);
719 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
720 			      u8 proto);
721 #else
722 
xfrm_audit_policy_add(struct xfrm_policy * xp,int result,bool task_valid)723 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
724 					 bool task_valid)
725 {
726 }
727 
xfrm_audit_policy_delete(struct xfrm_policy * xp,int result,bool task_valid)728 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
729 					    bool task_valid)
730 {
731 }
732 
xfrm_audit_state_add(struct xfrm_state * x,int result,bool task_valid)733 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
734 					bool task_valid)
735 {
736 }
737 
xfrm_audit_state_delete(struct xfrm_state * x,int result,bool task_valid)738 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
739 					   bool task_valid)
740 {
741 }
742 
xfrm_audit_state_replay_overflow(struct xfrm_state * x,struct sk_buff * skb)743 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
744 					     struct sk_buff *skb)
745 {
746 }
747 
xfrm_audit_state_replay(struct xfrm_state * x,struct sk_buff * skb,__be32 net_seq)748 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
749 					   struct sk_buff *skb, __be32 net_seq)
750 {
751 }
752 
xfrm_audit_state_notfound_simple(struct sk_buff * skb,u16 family)753 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
754 				      u16 family)
755 {
756 }
757 
xfrm_audit_state_notfound(struct sk_buff * skb,u16 family,__be32 net_spi,__be32 net_seq)758 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
759 				      __be32 net_spi, __be32 net_seq)
760 {
761 }
762 
xfrm_audit_state_icvfail(struct xfrm_state * x,struct sk_buff * skb,u8 proto)763 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
764 				     struct sk_buff *skb, u8 proto)
765 {
766 }
767 #endif /* CONFIG_AUDITSYSCALL */
768 
xfrm_pol_hold(struct xfrm_policy * policy)769 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
770 {
771 	if (likely(policy != NULL))
772 		refcount_inc(&policy->refcnt);
773 }
774 
775 void xfrm_policy_destroy(struct xfrm_policy *policy);
776 
xfrm_pol_put(struct xfrm_policy * policy)777 static inline void xfrm_pol_put(struct xfrm_policy *policy)
778 {
779 	if (refcount_dec_and_test(&policy->refcnt))
780 		xfrm_policy_destroy(policy);
781 }
782 
xfrm_pols_put(struct xfrm_policy ** pols,int npols)783 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
784 {
785 	int i;
786 	for (i = npols - 1; i >= 0; --i)
787 		xfrm_pol_put(pols[i]);
788 }
789 
790 void __xfrm_state_destroy(struct xfrm_state *, bool);
791 
__xfrm_state_put(struct xfrm_state * x)792 static inline void __xfrm_state_put(struct xfrm_state *x)
793 {
794 	refcount_dec(&x->refcnt);
795 }
796 
xfrm_state_put(struct xfrm_state * x)797 static inline void xfrm_state_put(struct xfrm_state *x)
798 {
799 	if (refcount_dec_and_test(&x->refcnt))
800 		__xfrm_state_destroy(x, false);
801 }
802 
xfrm_state_put_sync(struct xfrm_state * x)803 static inline void xfrm_state_put_sync(struct xfrm_state *x)
804 {
805 	if (refcount_dec_and_test(&x->refcnt))
806 		__xfrm_state_destroy(x, true);
807 }
808 
xfrm_state_hold(struct xfrm_state * x)809 static inline void xfrm_state_hold(struct xfrm_state *x)
810 {
811 	refcount_inc(&x->refcnt);
812 }
813 
addr_match(const void * token1,const void * token2,unsigned int prefixlen)814 static inline bool addr_match(const void *token1, const void *token2,
815 			      unsigned int prefixlen)
816 {
817 	const __be32 *a1 = token1;
818 	const __be32 *a2 = token2;
819 	unsigned int pdw;
820 	unsigned int pbi;
821 
822 	pdw = prefixlen >> 5;	  /* num of whole u32 in prefix */
823 	pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
824 
825 	if (pdw)
826 		if (memcmp(a1, a2, pdw << 2))
827 			return false;
828 
829 	if (pbi) {
830 		__be32 mask;
831 
832 		mask = htonl((0xffffffff) << (32 - pbi));
833 
834 		if ((a1[pdw] ^ a2[pdw]) & mask)
835 			return false;
836 	}
837 
838 	return true;
839 }
840 
addr4_match(__be32 a1,__be32 a2,u8 prefixlen)841 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
842 {
843 	/* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
844 	if (sizeof(long) == 4 && prefixlen == 0)
845 		return true;
846 	return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
847 }
848 
849 static __inline__
xfrm_flowi_sport(const struct flowi * fl,const union flowi_uli * uli)850 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
851 {
852 	__be16 port;
853 	switch(fl->flowi_proto) {
854 	case IPPROTO_TCP:
855 	case IPPROTO_UDP:
856 	case IPPROTO_UDPLITE:
857 	case IPPROTO_SCTP:
858 		port = uli->ports.sport;
859 		break;
860 	case IPPROTO_ICMP:
861 	case IPPROTO_ICMPV6:
862 		port = htons(uli->icmpt.type);
863 		break;
864 	case IPPROTO_MH:
865 		port = htons(uli->mht.type);
866 		break;
867 	case IPPROTO_GRE:
868 		port = htons(ntohl(uli->gre_key) >> 16);
869 		break;
870 	default:
871 		port = 0;	/*XXX*/
872 	}
873 	return port;
874 }
875 
876 static __inline__
xfrm_flowi_dport(const struct flowi * fl,const union flowi_uli * uli)877 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
878 {
879 	__be16 port;
880 	switch(fl->flowi_proto) {
881 	case IPPROTO_TCP:
882 	case IPPROTO_UDP:
883 	case IPPROTO_UDPLITE:
884 	case IPPROTO_SCTP:
885 		port = uli->ports.dport;
886 		break;
887 	case IPPROTO_ICMP:
888 	case IPPROTO_ICMPV6:
889 		port = htons(uli->icmpt.code);
890 		break;
891 	case IPPROTO_GRE:
892 		port = htons(ntohl(uli->gre_key) & 0xffff);
893 		break;
894 	default:
895 		port = 0;	/*XXX*/
896 	}
897 	return port;
898 }
899 
900 bool xfrm_selector_match(const struct xfrm_selector *sel,
901 			 const struct flowi *fl, unsigned short family);
902 
903 #ifdef CONFIG_SECURITY_NETWORK_XFRM
904 /*	If neither has a context --> match
905  * 	Otherwise, both must have a context and the sids, doi, alg must match
906  */
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)907 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
908 {
909 	return ((!s1 && !s2) ||
910 		(s1 && s2 &&
911 		 (s1->ctx_sid == s2->ctx_sid) &&
912 		 (s1->ctx_doi == s2->ctx_doi) &&
913 		 (s1->ctx_alg == s2->ctx_alg)));
914 }
915 #else
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)916 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
917 {
918 	return true;
919 }
920 #endif
921 
922 /* A struct encoding bundle of transformations to apply to some set of flow.
923  *
924  * xdst->child points to the next element of bundle.
925  * dst->xfrm  points to an instanse of transformer.
926  *
927  * Due to unfortunate limitations of current routing cache, which we
928  * have no time to fix, it mirrors struct rtable and bound to the same
929  * routing key, including saddr,daddr. However, we can have many of
930  * bundles differing by session id. All the bundles grow from a parent
931  * policy rule.
932  */
933 struct xfrm_dst {
934 	union {
935 		struct dst_entry	dst;
936 		struct rtable		rt;
937 		struct rt6_info		rt6;
938 	} u;
939 	struct dst_entry *route;
940 	struct dst_entry *child;
941 	struct dst_entry *path;
942 	struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
943 	int num_pols, num_xfrms;
944 	u32 xfrm_genid;
945 	u32 policy_genid;
946 	u32 route_mtu_cached;
947 	u32 child_mtu_cached;
948 	u32 route_cookie;
949 	u32 path_cookie;
950 };
951 
xfrm_dst_path(const struct dst_entry * dst)952 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
953 {
954 #ifdef CONFIG_XFRM
955 	if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
956 		const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
957 
958 		return xdst->path;
959 	}
960 #endif
961 	return (struct dst_entry *) dst;
962 }
963 
xfrm_dst_child(const struct dst_entry * dst)964 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
965 {
966 #ifdef CONFIG_XFRM
967 	if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
968 		struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
969 		return xdst->child;
970 	}
971 #endif
972 	return NULL;
973 }
974 
975 #ifdef CONFIG_XFRM
xfrm_dst_set_child(struct xfrm_dst * xdst,struct dst_entry * child)976 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
977 {
978 	xdst->child = child;
979 }
980 
xfrm_dst_destroy(struct xfrm_dst * xdst)981 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
982 {
983 	xfrm_pols_put(xdst->pols, xdst->num_pols);
984 	dst_release(xdst->route);
985 	if (likely(xdst->u.dst.xfrm))
986 		xfrm_state_put(xdst->u.dst.xfrm);
987 }
988 #endif
989 
990 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
991 
992 struct xfrm_if_parms {
993 	int link;		/* ifindex of underlying L2 interface */
994 	u32 if_id;		/* interface identifyer */
995 	bool collect_md;
996 };
997 
998 struct xfrm_if {
999 	struct xfrm_if __rcu *next;	/* next interface in list */
1000 	struct net_device *dev;		/* virtual device associated with interface */
1001 	struct net *net;		/* netns for packet i/o */
1002 	struct xfrm_if_parms p;		/* interface parms */
1003 
1004 	struct gro_cells gro_cells;
1005 };
1006 
1007 struct xfrm_offload {
1008 	/* Output sequence number for replay protection on offloading. */
1009 	struct {
1010 		__u32 low;
1011 		__u32 hi;
1012 	} seq;
1013 
1014 	__u32			flags;
1015 #define	SA_DELETE_REQ		1
1016 #define	CRYPTO_DONE		2
1017 #define	CRYPTO_NEXT_DONE	4
1018 #define	CRYPTO_FALLBACK		8
1019 #define	XFRM_GSO_SEGMENT	16
1020 #define	XFRM_GRO		32
1021 /* 64 is free */
1022 #define	XFRM_DEV_RESUME		128
1023 #define	XFRM_XMIT		256
1024 
1025 	__u32			status;
1026 #define CRYPTO_SUCCESS				1
1027 #define CRYPTO_GENERIC_ERROR			2
1028 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED		4
1029 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED	8
1030 #define CRYPTO_TUNNEL_AH_AUTH_FAILED		16
1031 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED		32
1032 #define CRYPTO_INVALID_PACKET_SYNTAX		64
1033 #define CRYPTO_INVALID_PROTOCOL			128
1034 
1035 	__u8			proto;
1036 	__u8			inner_ipproto;
1037 };
1038 
1039 struct sec_path {
1040 	int			len;
1041 	int			olen;
1042 
1043 	struct xfrm_state	*xvec[XFRM_MAX_DEPTH];
1044 	struct xfrm_offload	ovec[XFRM_MAX_OFFLOAD_DEPTH];
1045 };
1046 
1047 struct sec_path *secpath_set(struct sk_buff *skb);
1048 
1049 static inline void
secpath_reset(struct sk_buff * skb)1050 secpath_reset(struct sk_buff *skb)
1051 {
1052 #ifdef CONFIG_XFRM
1053 	skb_ext_del(skb, SKB_EXT_SEC_PATH);
1054 #endif
1055 }
1056 
1057 static inline int
xfrm_addr_any(const xfrm_address_t * addr,unsigned short family)1058 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1059 {
1060 	switch (family) {
1061 	case AF_INET:
1062 		return addr->a4 == 0;
1063 	case AF_INET6:
1064 		return ipv6_addr_any(&addr->in6);
1065 	}
1066 	return 0;
1067 }
1068 
1069 static inline int
__xfrm4_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)1070 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1071 {
1072 	return	(tmpl->saddr.a4 &&
1073 		 tmpl->saddr.a4 != x->props.saddr.a4);
1074 }
1075 
1076 static inline int
__xfrm6_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)1077 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1078 {
1079 	return	(!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1080 		 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1081 }
1082 
1083 static inline int
xfrm_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x,unsigned short family)1084 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1085 {
1086 	switch (family) {
1087 	case AF_INET:
1088 		return __xfrm4_state_addr_cmp(tmpl, x);
1089 	case AF_INET6:
1090 		return __xfrm6_state_addr_cmp(tmpl, x);
1091 	}
1092 	return !0;
1093 }
1094 
1095 #ifdef CONFIG_XFRM
1096 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1097 			unsigned short family);
1098 
__xfrm_check_nopolicy(struct net * net,struct sk_buff * skb,int dir)1099 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1100 					 int dir)
1101 {
1102 	if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1103 		return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1104 
1105 	return false;
1106 }
1107 
__xfrm_check_dev_nopolicy(struct sk_buff * skb,int dir,unsigned short family)1108 static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1109 					     int dir, unsigned short family)
1110 {
1111 	if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1112 		/* same dst may be used for traffic originating from
1113 		 * devices with different policy settings.
1114 		 */
1115 		return IPCB(skb)->flags & IPSKB_NOPOLICY;
1116 	}
1117 	return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1118 }
1119 
__xfrm_policy_check2(struct sock * sk,int dir,struct sk_buff * skb,unsigned int family,int reverse)1120 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1121 				       struct sk_buff *skb,
1122 				       unsigned int family, int reverse)
1123 {
1124 	struct net *net = dev_net(skb->dev);
1125 	int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1126 
1127 	if (sk && sk->sk_policy[XFRM_POLICY_IN])
1128 		return __xfrm_policy_check(sk, ndir, skb, family);
1129 
1130 	return __xfrm_check_nopolicy(net, skb, dir) ||
1131 	       __xfrm_check_dev_nopolicy(skb, dir, family) ||
1132 	       __xfrm_policy_check(sk, ndir, skb, family);
1133 }
1134 
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1135 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1136 {
1137 	return __xfrm_policy_check2(sk, dir, skb, family, 0);
1138 }
1139 
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1140 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1141 {
1142 	return xfrm_policy_check(sk, dir, skb, AF_INET);
1143 }
1144 
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1145 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1146 {
1147 	return xfrm_policy_check(sk, dir, skb, AF_INET6);
1148 }
1149 
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1150 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1151 					     struct sk_buff *skb)
1152 {
1153 	return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1154 }
1155 
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1156 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1157 					     struct sk_buff *skb)
1158 {
1159 	return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1160 }
1161 
1162 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1163 			  unsigned int family, int reverse);
1164 
xfrm_decode_session(struct sk_buff * skb,struct flowi * fl,unsigned int family)1165 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1166 				      unsigned int family)
1167 {
1168 	return __xfrm_decode_session(skb, fl, family, 0);
1169 }
1170 
xfrm_decode_session_reverse(struct sk_buff * skb,struct flowi * fl,unsigned int family)1171 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1172 					      struct flowi *fl,
1173 					      unsigned int family)
1174 {
1175 	return __xfrm_decode_session(skb, fl, family, 1);
1176 }
1177 
1178 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1179 
xfrm_route_forward(struct sk_buff * skb,unsigned short family)1180 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1181 {
1182 	struct net *net = dev_net(skb->dev);
1183 
1184 	if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1185 	    net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1186 		return true;
1187 
1188 	return (skb_dst(skb)->flags & DST_NOXFRM) ||
1189 	       __xfrm_route_forward(skb, family);
1190 }
1191 
xfrm4_route_forward(struct sk_buff * skb)1192 static inline int xfrm4_route_forward(struct sk_buff *skb)
1193 {
1194 	return xfrm_route_forward(skb, AF_INET);
1195 }
1196 
xfrm6_route_forward(struct sk_buff * skb)1197 static inline int xfrm6_route_forward(struct sk_buff *skb)
1198 {
1199 	return xfrm_route_forward(skb, AF_INET6);
1200 }
1201 
1202 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1203 
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1204 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1205 {
1206 	if (!sk_fullsock(osk))
1207 		return 0;
1208 	sk->sk_policy[0] = NULL;
1209 	sk->sk_policy[1] = NULL;
1210 	if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1211 		return __xfrm_sk_clone_policy(sk, osk);
1212 	return 0;
1213 }
1214 
1215 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1216 
xfrm_sk_free_policy(struct sock * sk)1217 static inline void xfrm_sk_free_policy(struct sock *sk)
1218 {
1219 	struct xfrm_policy *pol;
1220 
1221 	pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1222 	if (unlikely(pol != NULL)) {
1223 		xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1224 		sk->sk_policy[0] = NULL;
1225 	}
1226 	pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1227 	if (unlikely(pol != NULL)) {
1228 		xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1229 		sk->sk_policy[1] = NULL;
1230 	}
1231 }
1232 
1233 #else
1234 
xfrm_sk_free_policy(struct sock * sk)1235 static inline void xfrm_sk_free_policy(struct sock *sk) {}
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1236 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
xfrm6_route_forward(struct sk_buff * skb)1237 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
xfrm4_route_forward(struct sk_buff * skb)1238 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1239 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1240 {
1241 	return 1;
1242 }
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1243 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1244 {
1245 	return 1;
1246 }
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1247 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1248 {
1249 	return 1;
1250 }
xfrm_decode_session_reverse(struct sk_buff * skb,struct flowi * fl,unsigned int family)1251 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1252 					      struct flowi *fl,
1253 					      unsigned int family)
1254 {
1255 	return -ENOSYS;
1256 }
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1257 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1258 					     struct sk_buff *skb)
1259 {
1260 	return 1;
1261 }
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1262 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1263 					     struct sk_buff *skb)
1264 {
1265 	return 1;
1266 }
1267 #endif
1268 
1269 static __inline__
xfrm_flowi_daddr(const struct flowi * fl,unsigned short family)1270 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1271 {
1272 	switch (family){
1273 	case AF_INET:
1274 		return (xfrm_address_t *)&fl->u.ip4.daddr;
1275 	case AF_INET6:
1276 		return (xfrm_address_t *)&fl->u.ip6.daddr;
1277 	}
1278 	return NULL;
1279 }
1280 
1281 static __inline__
xfrm_flowi_saddr(const struct flowi * fl,unsigned short family)1282 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1283 {
1284 	switch (family){
1285 	case AF_INET:
1286 		return (xfrm_address_t *)&fl->u.ip4.saddr;
1287 	case AF_INET6:
1288 		return (xfrm_address_t *)&fl->u.ip6.saddr;
1289 	}
1290 	return NULL;
1291 }
1292 
1293 static __inline__
xfrm_flowi_addr_get(const struct flowi * fl,xfrm_address_t * saddr,xfrm_address_t * daddr,unsigned short family)1294 void xfrm_flowi_addr_get(const struct flowi *fl,
1295 			 xfrm_address_t *saddr, xfrm_address_t *daddr,
1296 			 unsigned short family)
1297 {
1298 	switch(family) {
1299 	case AF_INET:
1300 		memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1301 		memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1302 		break;
1303 	case AF_INET6:
1304 		saddr->in6 = fl->u.ip6.saddr;
1305 		daddr->in6 = fl->u.ip6.daddr;
1306 		break;
1307 	}
1308 }
1309 
1310 static __inline__ int
__xfrm4_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1311 __xfrm4_state_addr_check(const struct xfrm_state *x,
1312 			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1313 {
1314 	if (daddr->a4 == x->id.daddr.a4 &&
1315 	    (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1316 		return 1;
1317 	return 0;
1318 }
1319 
1320 static __inline__ int
__xfrm6_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1321 __xfrm6_state_addr_check(const struct xfrm_state *x,
1322 			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1323 {
1324 	if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1325 	    (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1326 	     ipv6_addr_any((struct in6_addr *)saddr) ||
1327 	     ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1328 		return 1;
1329 	return 0;
1330 }
1331 
1332 static __inline__ int
xfrm_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr,unsigned short family)1333 xfrm_state_addr_check(const struct xfrm_state *x,
1334 		      const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1335 		      unsigned short family)
1336 {
1337 	switch (family) {
1338 	case AF_INET:
1339 		return __xfrm4_state_addr_check(x, daddr, saddr);
1340 	case AF_INET6:
1341 		return __xfrm6_state_addr_check(x, daddr, saddr);
1342 	}
1343 	return 0;
1344 }
1345 
1346 static __inline__ int
xfrm_state_addr_flow_check(const struct xfrm_state * x,const struct flowi * fl,unsigned short family)1347 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1348 			   unsigned short family)
1349 {
1350 	switch (family) {
1351 	case AF_INET:
1352 		return __xfrm4_state_addr_check(x,
1353 						(const xfrm_address_t *)&fl->u.ip4.daddr,
1354 						(const xfrm_address_t *)&fl->u.ip4.saddr);
1355 	case AF_INET6:
1356 		return __xfrm6_state_addr_check(x,
1357 						(const xfrm_address_t *)&fl->u.ip6.daddr,
1358 						(const xfrm_address_t *)&fl->u.ip6.saddr);
1359 	}
1360 	return 0;
1361 }
1362 
xfrm_state_kern(const struct xfrm_state * x)1363 static inline int xfrm_state_kern(const struct xfrm_state *x)
1364 {
1365 	return atomic_read(&x->tunnel_users);
1366 }
1367 
xfrm_id_proto_valid(u8 proto)1368 static inline bool xfrm_id_proto_valid(u8 proto)
1369 {
1370 	switch (proto) {
1371 	case IPPROTO_AH:
1372 	case IPPROTO_ESP:
1373 	case IPPROTO_COMP:
1374 #if IS_ENABLED(CONFIG_IPV6)
1375 	case IPPROTO_ROUTING:
1376 	case IPPROTO_DSTOPTS:
1377 #endif
1378 		return true;
1379 	default:
1380 		return false;
1381 	}
1382 }
1383 
1384 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
xfrm_id_proto_match(u8 proto,u8 userproto)1385 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1386 {
1387 	return (!userproto || proto == userproto ||
1388 		(userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1389 						  proto == IPPROTO_ESP ||
1390 						  proto == IPPROTO_COMP)));
1391 }
1392 
1393 /*
1394  * xfrm algorithm information
1395  */
1396 struct xfrm_algo_aead_info {
1397 	char *geniv;
1398 	u16 icv_truncbits;
1399 };
1400 
1401 struct xfrm_algo_auth_info {
1402 	u16 icv_truncbits;
1403 	u16 icv_fullbits;
1404 };
1405 
1406 struct xfrm_algo_encr_info {
1407 	char *geniv;
1408 	u16 blockbits;
1409 	u16 defkeybits;
1410 };
1411 
1412 struct xfrm_algo_comp_info {
1413 	u16 threshold;
1414 };
1415 
1416 struct xfrm_algo_desc {
1417 	char *name;
1418 	char *compat;
1419 	u8 available:1;
1420 	u8 pfkey_supported:1;
1421 	union {
1422 		struct xfrm_algo_aead_info aead;
1423 		struct xfrm_algo_auth_info auth;
1424 		struct xfrm_algo_encr_info encr;
1425 		struct xfrm_algo_comp_info comp;
1426 	} uinfo;
1427 	struct sadb_alg desc;
1428 };
1429 
1430 /* XFRM protocol handlers.  */
1431 struct xfrm4_protocol {
1432 	int (*handler)(struct sk_buff *skb);
1433 	int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1434 			     int encap_type);
1435 	int (*cb_handler)(struct sk_buff *skb, int err);
1436 	int (*err_handler)(struct sk_buff *skb, u32 info);
1437 
1438 	struct xfrm4_protocol __rcu *next;
1439 	int priority;
1440 };
1441 
1442 struct xfrm6_protocol {
1443 	int (*handler)(struct sk_buff *skb);
1444 	int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1445 			     int encap_type);
1446 	int (*cb_handler)(struct sk_buff *skb, int err);
1447 	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1448 			   u8 type, u8 code, int offset, __be32 info);
1449 
1450 	struct xfrm6_protocol __rcu *next;
1451 	int priority;
1452 };
1453 
1454 /* XFRM tunnel handlers.  */
1455 struct xfrm_tunnel {
1456 	int (*handler)(struct sk_buff *skb);
1457 	int (*cb_handler)(struct sk_buff *skb, int err);
1458 	int (*err_handler)(struct sk_buff *skb, u32 info);
1459 
1460 	struct xfrm_tunnel __rcu *next;
1461 	int priority;
1462 };
1463 
1464 struct xfrm6_tunnel {
1465 	int (*handler)(struct sk_buff *skb);
1466 	int (*cb_handler)(struct sk_buff *skb, int err);
1467 	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1468 			   u8 type, u8 code, int offset, __be32 info);
1469 	struct xfrm6_tunnel __rcu *next;
1470 	int priority;
1471 };
1472 
1473 void xfrm_init(void);
1474 void xfrm4_init(void);
1475 int xfrm_state_init(struct net *net);
1476 void xfrm_state_fini(struct net *net);
1477 void xfrm4_state_init(void);
1478 void xfrm4_protocol_init(void);
1479 #ifdef CONFIG_XFRM
1480 int xfrm6_init(void);
1481 void xfrm6_fini(void);
1482 int xfrm6_state_init(void);
1483 void xfrm6_state_fini(void);
1484 int xfrm6_protocol_init(void);
1485 void xfrm6_protocol_fini(void);
1486 #else
xfrm6_init(void)1487 static inline int xfrm6_init(void)
1488 {
1489 	return 0;
1490 }
xfrm6_fini(void)1491 static inline void xfrm6_fini(void)
1492 {
1493 	;
1494 }
1495 #endif
1496 
1497 #ifdef CONFIG_XFRM_STATISTICS
1498 int xfrm_proc_init(struct net *net);
1499 void xfrm_proc_fini(struct net *net);
1500 #endif
1501 
1502 int xfrm_sysctl_init(struct net *net);
1503 #ifdef CONFIG_SYSCTL
1504 void xfrm_sysctl_fini(struct net *net);
1505 #else
xfrm_sysctl_fini(struct net * net)1506 static inline void xfrm_sysctl_fini(struct net *net)
1507 {
1508 }
1509 #endif
1510 
1511 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1512 			  struct xfrm_address_filter *filter);
1513 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1514 		    int (*func)(struct xfrm_state *, int, void*), void *);
1515 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1516 struct xfrm_state *xfrm_state_alloc(struct net *net);
1517 void xfrm_state_free(struct xfrm_state *x);
1518 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1519 				   const xfrm_address_t *saddr,
1520 				   const struct flowi *fl,
1521 				   struct xfrm_tmpl *tmpl,
1522 				   struct xfrm_policy *pol, int *err,
1523 				   unsigned short family, u32 if_id);
1524 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1525 				       xfrm_address_t *daddr,
1526 				       xfrm_address_t *saddr,
1527 				       unsigned short family,
1528 				       u8 mode, u8 proto, u32 reqid);
1529 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1530 					      unsigned short family);
1531 int xfrm_state_check_expire(struct xfrm_state *x);
1532 void xfrm_state_insert(struct xfrm_state *x);
1533 int xfrm_state_add(struct xfrm_state *x);
1534 int xfrm_state_update(struct xfrm_state *x);
1535 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1536 				     const xfrm_address_t *daddr, __be32 spi,
1537 				     u8 proto, unsigned short family);
1538 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1539 					    const xfrm_address_t *daddr,
1540 					    const xfrm_address_t *saddr,
1541 					    u8 proto,
1542 					    unsigned short family);
1543 #ifdef CONFIG_XFRM_SUB_POLICY
1544 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1545 		    unsigned short family);
1546 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1547 		     unsigned short family);
1548 #else
xfrm_tmpl_sort(struct xfrm_tmpl ** d,struct xfrm_tmpl ** s,int n,unsigned short family)1549 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1550 				  int n, unsigned short family)
1551 {
1552 }
1553 
xfrm_state_sort(struct xfrm_state ** d,struct xfrm_state ** s,int n,unsigned short family)1554 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1555 				   int n, unsigned short family)
1556 {
1557 }
1558 #endif
1559 
1560 struct xfrmk_sadinfo {
1561 	u32 sadhcnt; /* current hash bkts */
1562 	u32 sadhmcnt; /* max allowed hash bkts */
1563 	u32 sadcnt; /* current running count */
1564 };
1565 
1566 struct xfrmk_spdinfo {
1567 	u32 incnt;
1568 	u32 outcnt;
1569 	u32 fwdcnt;
1570 	u32 inscnt;
1571 	u32 outscnt;
1572 	u32 fwdscnt;
1573 	u32 spdhcnt;
1574 	u32 spdhmcnt;
1575 };
1576 
1577 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1578 int xfrm_state_delete(struct xfrm_state *x);
1579 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1580 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1581 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1582 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1583 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1584 int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1585 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1586 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1587 		      struct netlink_ext_ack *extack);
1588 int xfrm_init_state(struct xfrm_state *x);
1589 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1590 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1591 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1592 			 int (*finish)(struct net *, struct sock *,
1593 				       struct sk_buff *));
1594 int xfrm_trans_queue(struct sk_buff *skb,
1595 		     int (*finish)(struct net *, struct sock *,
1596 				   struct sk_buff *));
1597 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1598 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1599 
1600 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1601 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1602 #endif
1603 
1604 void xfrm_local_error(struct sk_buff *skb, int mtu);
1605 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1606 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1607 		    int encap_type);
1608 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1609 int xfrm4_rcv(struct sk_buff *skb);
1610 
xfrm4_rcv_spi(struct sk_buff * skb,int nexthdr,__be32 spi)1611 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1612 {
1613 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1614 	XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1615 	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1616 	return xfrm_input(skb, nexthdr, spi, 0);
1617 }
1618 
1619 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1620 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1621 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1622 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1623 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1624 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1625 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1626 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1627 		  struct ip6_tnl *t);
1628 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1629 		    int encap_type);
1630 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1631 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1632 int xfrm6_rcv(struct sk_buff *skb);
1633 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1634 		     xfrm_address_t *saddr, u8 proto);
1635 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1636 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1637 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1638 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1639 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1640 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1641 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1642 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1643 
1644 #ifdef CONFIG_XFRM
1645 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1646 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1647 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1648 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1649 		     int optlen);
1650 #else
xfrm_user_policy(struct sock * sk,int optname,sockptr_t optval,int optlen)1651 static inline int xfrm_user_policy(struct sock *sk, int optname,
1652 				   sockptr_t optval, int optlen)
1653 {
1654  	return -ENOPROTOOPT;
1655 }
1656 #endif
1657 
1658 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1659 				    const xfrm_address_t *saddr,
1660 				    const xfrm_address_t *daddr,
1661 				    int family, u32 mark);
1662 
1663 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1664 
1665 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1666 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1667 		     int (*func)(struct xfrm_policy *, int, int, void*),
1668 		     void *);
1669 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1670 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1671 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1672 					  const struct xfrm_mark *mark,
1673 					  u32 if_id, u8 type, int dir,
1674 					  struct xfrm_selector *sel,
1675 					  struct xfrm_sec_ctx *ctx, int delete,
1676 					  int *err);
1677 struct xfrm_policy *xfrm_policy_byid(struct net *net,
1678 				     const struct xfrm_mark *mark, u32 if_id,
1679 				     u8 type, int dir, u32 id, int delete,
1680 				     int *err);
1681 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1682 void xfrm_policy_hash_rebuild(struct net *net);
1683 u32 xfrm_get_acqseq(void);
1684 int verify_spi_info(u8 proto, u32 min, u32 max);
1685 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1686 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1687 				 u8 mode, u32 reqid, u32 if_id, u8 proto,
1688 				 const xfrm_address_t *daddr,
1689 				 const xfrm_address_t *saddr, int create,
1690 				 unsigned short family);
1691 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1692 
1693 #ifdef CONFIG_XFRM_MIGRATE
1694 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1695 	       const struct xfrm_migrate *m, int num_bundles,
1696 	       const struct xfrm_kmaddress *k,
1697 	       const struct xfrm_encap_tmpl *encap);
1698 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1699 						u32 if_id);
1700 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1701 				      struct xfrm_migrate *m,
1702 				      struct xfrm_encap_tmpl *encap);
1703 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1704 		 struct xfrm_migrate *m, int num_bundles,
1705 		 struct xfrm_kmaddress *k, struct net *net,
1706 		 struct xfrm_encap_tmpl *encap, u32 if_id);
1707 #endif
1708 
1709 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1710 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1711 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1712 	      xfrm_address_t *addr);
1713 
1714 void xfrm_input_init(void);
1715 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1716 
1717 void xfrm_probe_algs(void);
1718 int xfrm_count_pfkey_auth_supported(void);
1719 int xfrm_count_pfkey_enc_supported(void);
1720 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1721 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1722 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1723 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1724 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1725 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1726 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1727 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1728 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1729 					    int probe);
1730 
xfrm6_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b)1731 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1732 				    const xfrm_address_t *b)
1733 {
1734 	return ipv6_addr_equal((const struct in6_addr *)a,
1735 			       (const struct in6_addr *)b);
1736 }
1737 
xfrm_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b,sa_family_t family)1738 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1739 				   const xfrm_address_t *b,
1740 				   sa_family_t family)
1741 {
1742 	switch (family) {
1743 	default:
1744 	case AF_INET:
1745 		return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1746 	case AF_INET6:
1747 		return xfrm6_addr_equal(a, b);
1748 	}
1749 }
1750 
xfrm_policy_id2dir(u32 index)1751 static inline int xfrm_policy_id2dir(u32 index)
1752 {
1753 	return index & 7;
1754 }
1755 
1756 #ifdef CONFIG_XFRM
1757 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1758 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1759 void xfrm_replay_notify(struct xfrm_state *x, int event);
1760 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1761 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1762 
xfrm_aevent_is_on(struct net * net)1763 static inline int xfrm_aevent_is_on(struct net *net)
1764 {
1765 	struct sock *nlsk;
1766 	int ret = 0;
1767 
1768 	rcu_read_lock();
1769 	nlsk = rcu_dereference(net->xfrm.nlsk);
1770 	if (nlsk)
1771 		ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1772 	rcu_read_unlock();
1773 	return ret;
1774 }
1775 
xfrm_acquire_is_on(struct net * net)1776 static inline int xfrm_acquire_is_on(struct net *net)
1777 {
1778 	struct sock *nlsk;
1779 	int ret = 0;
1780 
1781 	rcu_read_lock();
1782 	nlsk = rcu_dereference(net->xfrm.nlsk);
1783 	if (nlsk)
1784 		ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1785 	rcu_read_unlock();
1786 
1787 	return ret;
1788 }
1789 #endif
1790 
aead_len(struct xfrm_algo_aead * alg)1791 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1792 {
1793 	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1794 }
1795 
xfrm_alg_len(const struct xfrm_algo * alg)1796 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1797 {
1798 	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1799 }
1800 
xfrm_alg_auth_len(const struct xfrm_algo_auth * alg)1801 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1802 {
1803 	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1804 }
1805 
xfrm_replay_state_esn_len(struct xfrm_replay_state_esn * replay_esn)1806 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1807 {
1808 	return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1809 }
1810 
1811 #ifdef CONFIG_XFRM_MIGRATE
xfrm_replay_clone(struct xfrm_state * x,struct xfrm_state * orig)1812 static inline int xfrm_replay_clone(struct xfrm_state *x,
1813 				     struct xfrm_state *orig)
1814 {
1815 
1816 	x->replay_esn = kmemdup(orig->replay_esn,
1817 				xfrm_replay_state_esn_len(orig->replay_esn),
1818 				GFP_KERNEL);
1819 	if (!x->replay_esn)
1820 		return -ENOMEM;
1821 	x->preplay_esn = kmemdup(orig->preplay_esn,
1822 				 xfrm_replay_state_esn_len(orig->preplay_esn),
1823 				 GFP_KERNEL);
1824 	if (!x->preplay_esn)
1825 		return -ENOMEM;
1826 
1827 	return 0;
1828 }
1829 
xfrm_algo_aead_clone(struct xfrm_algo_aead * orig)1830 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1831 {
1832 	return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1833 }
1834 
1835 
xfrm_algo_clone(struct xfrm_algo * orig)1836 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1837 {
1838 	return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1839 }
1840 
xfrm_algo_auth_clone(struct xfrm_algo_auth * orig)1841 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1842 {
1843 	return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1844 }
1845 
xfrm_states_put(struct xfrm_state ** states,int n)1846 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1847 {
1848 	int i;
1849 	for (i = 0; i < n; i++)
1850 		xfrm_state_put(*(states + i));
1851 }
1852 
xfrm_states_delete(struct xfrm_state ** states,int n)1853 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1854 {
1855 	int i;
1856 	for (i = 0; i < n; i++)
1857 		xfrm_state_delete(*(states + i));
1858 }
1859 #endif
1860 
1861 #ifdef CONFIG_XFRM
xfrm_input_state(struct sk_buff * skb)1862 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1863 {
1864 	struct sec_path *sp = skb_sec_path(skb);
1865 
1866 	return sp->xvec[sp->len - 1];
1867 }
1868 #endif
1869 
xfrm_offload(struct sk_buff * skb)1870 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1871 {
1872 #ifdef CONFIG_XFRM
1873 	struct sec_path *sp = skb_sec_path(skb);
1874 
1875 	if (!sp || !sp->olen || sp->len != sp->olen)
1876 		return NULL;
1877 
1878 	return &sp->ovec[sp->olen - 1];
1879 #else
1880 	return NULL;
1881 #endif
1882 }
1883 
1884 void __init xfrm_dev_init(void);
1885 
1886 #ifdef CONFIG_XFRM_OFFLOAD
1887 void xfrm_dev_resume(struct sk_buff *skb);
1888 void xfrm_dev_backlog(struct softnet_data *sd);
1889 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1890 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1891 		       struct xfrm_user_offload *xuo,
1892 		       struct netlink_ext_ack *extack);
1893 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1894 
xfrm_dev_state_advance_esn(struct xfrm_state * x)1895 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1896 {
1897 	struct xfrm_dev_offload *xso = &x->xso;
1898 
1899 	if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1900 		xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1901 }
1902 
xfrm_dst_offload_ok(struct dst_entry * dst)1903 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1904 {
1905 	struct xfrm_state *x = dst->xfrm;
1906 	struct xfrm_dst *xdst;
1907 
1908 	if (!x || !x->type_offload)
1909 		return false;
1910 
1911 	xdst = (struct xfrm_dst *) dst;
1912 	if (!x->xso.offload_handle && !xdst->child->xfrm)
1913 		return true;
1914 	if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1915 	    !xdst->child->xfrm)
1916 		return true;
1917 
1918 	return false;
1919 }
1920 
xfrm_dev_state_delete(struct xfrm_state * x)1921 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1922 {
1923 	struct xfrm_dev_offload *xso = &x->xso;
1924 
1925 	if (xso->dev)
1926 		xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1927 }
1928 
xfrm_dev_state_free(struct xfrm_state * x)1929 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1930 {
1931 	struct xfrm_dev_offload *xso = &x->xso;
1932 	struct net_device *dev = xso->dev;
1933 
1934 	if (dev && dev->xfrmdev_ops) {
1935 		if (dev->xfrmdev_ops->xdo_dev_state_free)
1936 			dev->xfrmdev_ops->xdo_dev_state_free(x);
1937 		xso->dev = NULL;
1938 		netdev_put(dev, &xso->dev_tracker);
1939 	}
1940 }
1941 #else
xfrm_dev_resume(struct sk_buff * skb)1942 static inline void xfrm_dev_resume(struct sk_buff *skb)
1943 {
1944 }
1945 
xfrm_dev_backlog(struct softnet_data * sd)1946 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1947 {
1948 }
1949 
validate_xmit_xfrm(struct sk_buff * skb,netdev_features_t features,bool * again)1950 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1951 {
1952 	return skb;
1953 }
1954 
xfrm_dev_state_add(struct net * net,struct xfrm_state * x,struct xfrm_user_offload * xuo,struct netlink_ext_ack * extack)1955 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
1956 {
1957 	return 0;
1958 }
1959 
xfrm_dev_state_delete(struct xfrm_state * x)1960 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1961 {
1962 }
1963 
xfrm_dev_state_free(struct xfrm_state * x)1964 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1965 {
1966 }
1967 
xfrm_dev_offload_ok(struct sk_buff * skb,struct xfrm_state * x)1968 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1969 {
1970 	return false;
1971 }
1972 
xfrm_dev_state_advance_esn(struct xfrm_state * x)1973 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1974 {
1975 }
1976 
xfrm_dst_offload_ok(struct dst_entry * dst)1977 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1978 {
1979 	return false;
1980 }
1981 #endif
1982 
xfrm_mark_get(struct nlattr ** attrs,struct xfrm_mark * m)1983 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1984 {
1985 	if (attrs[XFRMA_MARK])
1986 		memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1987 	else
1988 		m->v = m->m = 0;
1989 
1990 	return m->v & m->m;
1991 }
1992 
xfrm_mark_put(struct sk_buff * skb,const struct xfrm_mark * m)1993 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1994 {
1995 	int ret = 0;
1996 
1997 	if (m->m | m->v)
1998 		ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1999 	return ret;
2000 }
2001 
xfrm_smark_get(__u32 mark,struct xfrm_state * x)2002 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2003 {
2004 	struct xfrm_mark *m = &x->props.smark;
2005 
2006 	return (m->v & m->m) | (mark & ~m->m);
2007 }
2008 
xfrm_if_id_put(struct sk_buff * skb,__u32 if_id)2009 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2010 {
2011 	int ret = 0;
2012 
2013 	if (if_id)
2014 		ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2015 	return ret;
2016 }
2017 
xfrm_tunnel_check(struct sk_buff * skb,struct xfrm_state * x,unsigned int family)2018 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2019 				    unsigned int family)
2020 {
2021 	bool tunnel = false;
2022 
2023 	switch(family) {
2024 	case AF_INET:
2025 		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2026 			tunnel = true;
2027 		break;
2028 	case AF_INET6:
2029 		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2030 			tunnel = true;
2031 		break;
2032 	}
2033 	if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2034 		return -EINVAL;
2035 
2036 	return 0;
2037 }
2038 
2039 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2040 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2041 
2042 struct xfrm_translator {
2043 	/* Allocate frag_list and put compat translation there */
2044 	int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2045 
2046 	/* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2047 	struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2048 			int maxtype, const struct nla_policy *policy,
2049 			struct netlink_ext_ack *extack);
2050 
2051 	/* Translate 32-bit user_policy from sockptr */
2052 	int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2053 
2054 	struct module *owner;
2055 };
2056 
2057 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2058 extern int xfrm_register_translator(struct xfrm_translator *xtr);
2059 extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2060 extern struct xfrm_translator *xfrm_get_translator(void);
2061 extern void xfrm_put_translator(struct xfrm_translator *xtr);
2062 #else
xfrm_get_translator(void)2063 static inline struct xfrm_translator *xfrm_get_translator(void)
2064 {
2065 	return NULL;
2066 }
xfrm_put_translator(struct xfrm_translator * xtr)2067 static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2068 {
2069 }
2070 #endif
2071 
2072 #if IS_ENABLED(CONFIG_IPV6)
xfrm6_local_dontfrag(const struct sock * sk)2073 static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2074 {
2075 	int proto;
2076 
2077 	if (!sk || sk->sk_family != AF_INET6)
2078 		return false;
2079 
2080 	proto = sk->sk_protocol;
2081 	if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2082 		return inet6_sk(sk)->dontfrag;
2083 
2084 	return false;
2085 }
2086 #endif
2087 #endif	/* _NET_XFRM_H */
2088