xref: /openbmc/linux/include/net/xfrm.h (revision d5f53edd)
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 	XFRM_DEV_OFFLOAD_FWD,
133 };
134 
135 enum {
136 	XFRM_DEV_OFFLOAD_UNSPECIFIED,
137 	XFRM_DEV_OFFLOAD_CRYPTO,
138 	XFRM_DEV_OFFLOAD_PACKET,
139 };
140 
141 enum {
142 	XFRM_DEV_OFFLOAD_FLAG_ACQ = 1,
143 };
144 
145 struct xfrm_dev_offload {
146 	struct net_device	*dev;
147 	netdevice_tracker	dev_tracker;
148 	struct net_device	*real_dev;
149 	unsigned long		offload_handle;
150 	u8			dir : 2;
151 	u8			type : 2;
152 	u8			flags : 2;
153 };
154 
155 struct xfrm_mode {
156 	u8 encap;
157 	u8 family;
158 	u8 flags;
159 };
160 
161 /* Flags for xfrm_mode. */
162 enum {
163 	XFRM_MODE_FLAG_TUNNEL = 1,
164 };
165 
166 enum xfrm_replay_mode {
167 	XFRM_REPLAY_MODE_LEGACY,
168 	XFRM_REPLAY_MODE_BMP,
169 	XFRM_REPLAY_MODE_ESN,
170 };
171 
172 /* Full description of state of transformer. */
173 struct xfrm_state {
174 	possible_net_t		xs_net;
175 	union {
176 		struct hlist_node	gclist;
177 		struct hlist_node	bydst;
178 	};
179 	union {
180 		struct hlist_node	dev_gclist;
181 		struct hlist_node	bysrc;
182 	};
183 	struct hlist_node	byspi;
184 	struct hlist_node	byseq;
185 
186 	refcount_t		refcnt;
187 	spinlock_t		lock;
188 
189 	struct xfrm_id		id;
190 	struct xfrm_selector	sel;
191 	struct xfrm_mark	mark;
192 	u32			if_id;
193 	u32			tfcpad;
194 
195 	u32			genid;
196 
197 	/* Key manager bits */
198 	struct xfrm_state_walk	km;
199 
200 	/* Parameters of this state. */
201 	struct {
202 		u32		reqid;
203 		u8		mode;
204 		u8		replay_window;
205 		u8		aalgo, ealgo, calgo;
206 		u8		flags;
207 		u16		family;
208 		xfrm_address_t	saddr;
209 		int		header_len;
210 		int		trailer_len;
211 		u32		extra_flags;
212 		struct xfrm_mark	smark;
213 	} props;
214 
215 	struct xfrm_lifetime_cfg lft;
216 
217 	/* Data for transformer */
218 	struct xfrm_algo_auth	*aalg;
219 	struct xfrm_algo	*ealg;
220 	struct xfrm_algo	*calg;
221 	struct xfrm_algo_aead	*aead;
222 	const char		*geniv;
223 
224 	/* mapping change rate limiting */
225 	__be16 new_mapping_sport;
226 	u32 new_mapping;	/* seconds */
227 	u32 mapping_maxage;	/* seconds for input SA */
228 
229 	/* Data for encapsulator */
230 	struct xfrm_encap_tmpl	*encap;
231 	struct sock __rcu	*encap_sk;
232 
233 	/* Data for care-of address */
234 	xfrm_address_t	*coaddr;
235 
236 	/* IPComp needs an IPIP tunnel for handling uncompressed packets */
237 	struct xfrm_state	*tunnel;
238 
239 	/* If a tunnel, number of users + 1 */
240 	atomic_t		tunnel_users;
241 
242 	/* State for replay detection */
243 	struct xfrm_replay_state replay;
244 	struct xfrm_replay_state_esn *replay_esn;
245 
246 	/* Replay detection state at the time we sent the last notification */
247 	struct xfrm_replay_state preplay;
248 	struct xfrm_replay_state_esn *preplay_esn;
249 
250 	/* replay detection mode */
251 	enum xfrm_replay_mode    repl_mode;
252 	/* internal flag that only holds state for delayed aevent at the
253 	 * moment
254 	*/
255 	u32			xflags;
256 
257 	/* Replay detection notification settings */
258 	u32			replay_maxage;
259 	u32			replay_maxdiff;
260 
261 	/* Replay detection notification timer */
262 	struct timer_list	rtimer;
263 
264 	/* Statistics */
265 	struct xfrm_stats	stats;
266 
267 	struct xfrm_lifetime_cur curlft;
268 	struct hrtimer		mtimer;
269 
270 	struct xfrm_dev_offload xso;
271 
272 	/* used to fix curlft->add_time when changing date */
273 	long		saved_tmo;
274 
275 	/* Last used time */
276 	time64_t		lastused;
277 
278 	struct page_frag xfrag;
279 
280 	/* Reference to data common to all the instances of this
281 	 * transformer. */
282 	const struct xfrm_type	*type;
283 	struct xfrm_mode	inner_mode;
284 	struct xfrm_mode	inner_mode_iaf;
285 	struct xfrm_mode	outer_mode;
286 
287 	const struct xfrm_type_offload	*type_offload;
288 
289 	/* Security context */
290 	struct xfrm_sec_ctx	*security;
291 
292 	/* Private data of this transformer, format is opaque,
293 	 * interpreted by xfrm_type methods. */
294 	void			*data;
295 };
296 
xs_net(struct xfrm_state * x)297 static inline struct net *xs_net(struct xfrm_state *x)
298 {
299 	return read_pnet(&x->xs_net);
300 }
301 
302 /* xflags - make enum if more show up */
303 #define XFRM_TIME_DEFER	1
304 #define XFRM_SOFT_EXPIRE 2
305 
306 enum {
307 	XFRM_STATE_VOID,
308 	XFRM_STATE_ACQ,
309 	XFRM_STATE_VALID,
310 	XFRM_STATE_ERROR,
311 	XFRM_STATE_EXPIRED,
312 	XFRM_STATE_DEAD
313 };
314 
315 /* callback structure passed from either netlink or pfkey */
316 struct km_event {
317 	union {
318 		u32 hard;
319 		u32 proto;
320 		u32 byid;
321 		u32 aevent;
322 		u32 type;
323 	} data;
324 
325 	u32	seq;
326 	u32	portid;
327 	u32	event;
328 	struct net *net;
329 };
330 
331 struct xfrm_if_decode_session_result {
332 	struct net *net;
333 	u32 if_id;
334 };
335 
336 struct xfrm_if_cb {
337 	bool (*decode_session)(struct sk_buff *skb,
338 			       unsigned short family,
339 			       struct xfrm_if_decode_session_result *res);
340 };
341 
342 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
343 void xfrm_if_unregister_cb(void);
344 
345 struct net_device;
346 struct xfrm_type;
347 struct xfrm_dst;
348 struct xfrm_policy_afinfo {
349 	struct dst_ops		*dst_ops;
350 	struct dst_entry	*(*dst_lookup)(struct net *net,
351 					       int tos, int oif,
352 					       const xfrm_address_t *saddr,
353 					       const xfrm_address_t *daddr,
354 					       u32 mark);
355 	int			(*get_saddr)(struct net *net, int oif,
356 					     xfrm_address_t *saddr,
357 					     xfrm_address_t *daddr,
358 					     u32 mark);
359 	int			(*fill_dst)(struct xfrm_dst *xdst,
360 					    struct net_device *dev,
361 					    const struct flowi *fl);
362 	struct dst_entry	*(*blackhole_route)(struct net *net, struct dst_entry *orig);
363 };
364 
365 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
366 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
367 void km_policy_notify(struct xfrm_policy *xp, int dir,
368 		      const struct km_event *c);
369 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
370 
371 struct xfrm_tmpl;
372 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
373 	     struct xfrm_policy *pol);
374 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
375 int __xfrm_state_delete(struct xfrm_state *x);
376 
377 struct xfrm_state_afinfo {
378 	u8				family;
379 	u8				proto;
380 
381 	const struct xfrm_type_offload *type_offload_esp;
382 
383 	const struct xfrm_type		*type_esp;
384 	const struct xfrm_type		*type_ipip;
385 	const struct xfrm_type		*type_ipip6;
386 	const struct xfrm_type		*type_comp;
387 	const struct xfrm_type		*type_ah;
388 	const struct xfrm_type		*type_routing;
389 	const struct xfrm_type		*type_dstopts;
390 
391 	int			(*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
392 	int			(*transport_finish)(struct sk_buff *skb,
393 						    int async);
394 	void			(*local_error)(struct sk_buff *skb, u32 mtu);
395 };
396 
397 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
398 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
399 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
400 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
401 
402 struct xfrm_input_afinfo {
403 	u8			family;
404 	bool			is_ipip;
405 	int			(*callback)(struct sk_buff *skb, u8 protocol,
406 					    int err);
407 };
408 
409 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
410 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
411 
412 void xfrm_flush_gc(void);
413 void xfrm_state_delete_tunnel(struct xfrm_state *x);
414 
415 struct xfrm_type {
416 	struct module		*owner;
417 	u8			proto;
418 	u8			flags;
419 #define XFRM_TYPE_NON_FRAGMENT	1
420 #define XFRM_TYPE_REPLAY_PROT	2
421 #define XFRM_TYPE_LOCAL_COADDR	4
422 #define XFRM_TYPE_REMOTE_COADDR	8
423 
424 	int			(*init_state)(struct xfrm_state *x,
425 					      struct netlink_ext_ack *extack);
426 	void			(*destructor)(struct xfrm_state *);
427 	int			(*input)(struct xfrm_state *, struct sk_buff *skb);
428 	int			(*output)(struct xfrm_state *, struct sk_buff *pskb);
429 	int			(*reject)(struct xfrm_state *, struct sk_buff *,
430 					  const struct flowi *);
431 };
432 
433 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
434 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
435 
436 struct xfrm_type_offload {
437 	struct module	*owner;
438 	u8		proto;
439 	void		(*encap)(struct xfrm_state *, struct sk_buff *pskb);
440 	int		(*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
441 	int		(*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
442 };
443 
444 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
445 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
446 
xfrm_af2proto(unsigned int family)447 static inline int xfrm_af2proto(unsigned int family)
448 {
449 	switch(family) {
450 	case AF_INET:
451 		return IPPROTO_IPIP;
452 	case AF_INET6:
453 		return IPPROTO_IPV6;
454 	default:
455 		return 0;
456 	}
457 }
458 
xfrm_ip2inner_mode(struct xfrm_state * x,int ipproto)459 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
460 {
461 	if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
462 	    (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
463 		return &x->inner_mode;
464 	else
465 		return &x->inner_mode_iaf;
466 }
467 
468 struct xfrm_tmpl {
469 /* id in template is interpreted as:
470  * daddr - destination of tunnel, may be zero for transport mode.
471  * spi   - zero to acquire spi. Not zero if spi is static, then
472  *	   daddr must be fixed too.
473  * proto - AH/ESP/IPCOMP
474  */
475 	struct xfrm_id		id;
476 
477 /* Source address of tunnel. Ignored, if it is not a tunnel. */
478 	xfrm_address_t		saddr;
479 
480 	unsigned short		encap_family;
481 
482 	u32			reqid;
483 
484 /* Mode: transport, tunnel etc. */
485 	u8			mode;
486 
487 /* Sharing mode: unique, this session only, this user only etc. */
488 	u8			share;
489 
490 /* May skip this transfomration if no SA is found */
491 	u8			optional;
492 
493 /* Skip aalgos/ealgos/calgos checks. */
494 	u8			allalgs;
495 
496 /* Bit mask of algos allowed for acquisition */
497 	u32			aalgos;
498 	u32			ealgos;
499 	u32			calgos;
500 };
501 
502 #define XFRM_MAX_DEPTH		6
503 #define XFRM_MAX_OFFLOAD_DEPTH	1
504 
505 struct xfrm_policy_walk_entry {
506 	struct list_head	all;
507 	u8			dead;
508 };
509 
510 struct xfrm_policy_walk {
511 	struct xfrm_policy_walk_entry walk;
512 	u8 type;
513 	u32 seq;
514 };
515 
516 struct xfrm_policy_queue {
517 	struct sk_buff_head	hold_queue;
518 	struct timer_list	hold_timer;
519 	unsigned long		timeout;
520 };
521 
522 struct xfrm_policy {
523 	possible_net_t		xp_net;
524 	struct hlist_node	bydst;
525 	struct hlist_node	byidx;
526 
527 	/* This lock only affects elements except for entry. */
528 	rwlock_t		lock;
529 	refcount_t		refcnt;
530 	u32			pos;
531 	struct timer_list	timer;
532 
533 	atomic_t		genid;
534 	u32			priority;
535 	u32			index;
536 	u32			if_id;
537 	struct xfrm_mark	mark;
538 	struct xfrm_selector	selector;
539 	struct xfrm_lifetime_cfg lft;
540 	struct xfrm_lifetime_cur curlft;
541 	struct xfrm_policy_walk_entry walk;
542 	struct xfrm_policy_queue polq;
543 	bool                    bydst_reinsert;
544 	u8			type;
545 	u8			action;
546 	u8			flags;
547 	u8			xfrm_nr;
548 	u16			family;
549 	struct xfrm_sec_ctx	*security;
550 	struct xfrm_tmpl       	xfrm_vec[XFRM_MAX_DEPTH];
551 	struct hlist_node	bydst_inexact_list;
552 	struct rcu_head		rcu;
553 
554 	struct xfrm_dev_offload xdo;
555 };
556 
xp_net(const struct xfrm_policy * xp)557 static inline struct net *xp_net(const struct xfrm_policy *xp)
558 {
559 	return read_pnet(&xp->xp_net);
560 }
561 
562 struct xfrm_kmaddress {
563 	xfrm_address_t          local;
564 	xfrm_address_t          remote;
565 	u32			reserved;
566 	u16			family;
567 };
568 
569 struct xfrm_migrate {
570 	xfrm_address_t		old_daddr;
571 	xfrm_address_t		old_saddr;
572 	xfrm_address_t		new_daddr;
573 	xfrm_address_t		new_saddr;
574 	u8			proto;
575 	u8			mode;
576 	u16			reserved;
577 	u32			reqid;
578 	u16			old_family;
579 	u16			new_family;
580 };
581 
582 #define XFRM_KM_TIMEOUT                30
583 /* what happened */
584 #define XFRM_REPLAY_UPDATE	XFRM_AE_CR
585 #define XFRM_REPLAY_TIMEOUT	XFRM_AE_CE
586 
587 /* default aevent timeout in units of 100ms */
588 #define XFRM_AE_ETIME			10
589 /* Async Event timer multiplier */
590 #define XFRM_AE_ETH_M			10
591 /* default seq threshold size */
592 #define XFRM_AE_SEQT_SIZE		2
593 
594 struct xfrm_mgr {
595 	struct list_head	list;
596 	int			(*notify)(struct xfrm_state *x, const struct km_event *c);
597 	int			(*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
598 	struct xfrm_policy	*(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
599 	int			(*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
600 	int			(*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
601 	int			(*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
602 	int			(*migrate)(const struct xfrm_selector *sel,
603 					   u8 dir, u8 type,
604 					   const struct xfrm_migrate *m,
605 					   int num_bundles,
606 					   const struct xfrm_kmaddress *k,
607 					   const struct xfrm_encap_tmpl *encap);
608 	bool			(*is_alive)(const struct km_event *c);
609 };
610 
611 void xfrm_register_km(struct xfrm_mgr *km);
612 void xfrm_unregister_km(struct xfrm_mgr *km);
613 
614 struct xfrm_tunnel_skb_cb {
615 	union {
616 		struct inet_skb_parm h4;
617 		struct inet6_skb_parm h6;
618 	} header;
619 
620 	union {
621 		struct ip_tunnel *ip4;
622 		struct ip6_tnl *ip6;
623 	} tunnel;
624 };
625 
626 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
627 
628 /*
629  * This structure is used for the duration where packets are being
630  * transformed by IPsec.  As soon as the packet leaves IPsec the
631  * area beyond the generic IP part may be overwritten.
632  */
633 struct xfrm_skb_cb {
634 	struct xfrm_tunnel_skb_cb header;
635 
636         /* Sequence number for replay protection. */
637 	union {
638 		struct {
639 			__u32 low;
640 			__u32 hi;
641 		} output;
642 		struct {
643 			__be32 low;
644 			__be32 hi;
645 		} input;
646 	} seq;
647 };
648 
649 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
650 
651 /*
652  * This structure is used by the afinfo prepare_input/prepare_output functions
653  * to transmit header information to the mode input/output functions.
654  */
655 struct xfrm_mode_skb_cb {
656 	struct xfrm_tunnel_skb_cb header;
657 
658 	/* Copied from header for IPv4, always set to zero and DF for IPv6. */
659 	__be16 id;
660 	__be16 frag_off;
661 
662 	/* IP header length (excluding options or extension headers). */
663 	u8 ihl;
664 
665 	/* TOS for IPv4, class for IPv6. */
666 	u8 tos;
667 
668 	/* TTL for IPv4, hop limitfor IPv6. */
669 	u8 ttl;
670 
671 	/* Protocol for IPv4, NH for IPv6. */
672 	u8 protocol;
673 
674 	/* Option length for IPv4, zero for IPv6. */
675 	u8 optlen;
676 
677 	/* Used by IPv6 only, zero for IPv4. */
678 	u8 flow_lbl[3];
679 };
680 
681 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
682 
683 /*
684  * This structure is used by the input processing to locate the SPI and
685  * related information.
686  */
687 struct xfrm_spi_skb_cb {
688 	struct xfrm_tunnel_skb_cb header;
689 
690 	unsigned int daddroff;
691 	unsigned int family;
692 	__be32 seq;
693 };
694 
695 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
696 
697 #ifdef CONFIG_AUDITSYSCALL
xfrm_audit_start(const char * op)698 static inline struct audit_buffer *xfrm_audit_start(const char *op)
699 {
700 	struct audit_buffer *audit_buf = NULL;
701 
702 	if (audit_enabled == AUDIT_OFF)
703 		return NULL;
704 	audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
705 				    AUDIT_MAC_IPSEC_EVENT);
706 	if (audit_buf == NULL)
707 		return NULL;
708 	audit_log_format(audit_buf, "op=%s", op);
709 	return audit_buf;
710 }
711 
xfrm_audit_helper_usrinfo(bool task_valid,struct audit_buffer * audit_buf)712 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
713 					     struct audit_buffer *audit_buf)
714 {
715 	const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
716 					    audit_get_loginuid(current) :
717 					    INVALID_UID);
718 	const unsigned int ses = task_valid ? audit_get_sessionid(current) :
719 		AUDIT_SID_UNSET;
720 
721 	audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
722 	audit_log_task_context(audit_buf);
723 }
724 
725 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
726 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
727 			      bool task_valid);
728 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
729 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
730 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
731 				      struct sk_buff *skb);
732 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
733 			     __be32 net_seq);
734 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
735 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
736 			       __be32 net_seq);
737 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
738 			      u8 proto);
739 #else
740 
xfrm_audit_policy_add(struct xfrm_policy * xp,int result,bool task_valid)741 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
742 					 bool task_valid)
743 {
744 }
745 
xfrm_audit_policy_delete(struct xfrm_policy * xp,int result,bool task_valid)746 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
747 					    bool task_valid)
748 {
749 }
750 
xfrm_audit_state_add(struct xfrm_state * x,int result,bool task_valid)751 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
752 					bool task_valid)
753 {
754 }
755 
xfrm_audit_state_delete(struct xfrm_state * x,int result,bool task_valid)756 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
757 					   bool task_valid)
758 {
759 }
760 
xfrm_audit_state_replay_overflow(struct xfrm_state * x,struct sk_buff * skb)761 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
762 					     struct sk_buff *skb)
763 {
764 }
765 
xfrm_audit_state_replay(struct xfrm_state * x,struct sk_buff * skb,__be32 net_seq)766 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
767 					   struct sk_buff *skb, __be32 net_seq)
768 {
769 }
770 
xfrm_audit_state_notfound_simple(struct sk_buff * skb,u16 family)771 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
772 				      u16 family)
773 {
774 }
775 
xfrm_audit_state_notfound(struct sk_buff * skb,u16 family,__be32 net_spi,__be32 net_seq)776 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
777 				      __be32 net_spi, __be32 net_seq)
778 {
779 }
780 
xfrm_audit_state_icvfail(struct xfrm_state * x,struct sk_buff * skb,u8 proto)781 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
782 				     struct sk_buff *skb, u8 proto)
783 {
784 }
785 #endif /* CONFIG_AUDITSYSCALL */
786 
xfrm_pol_hold(struct xfrm_policy * policy)787 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
788 {
789 	if (likely(policy != NULL))
790 		refcount_inc(&policy->refcnt);
791 }
792 
793 void xfrm_policy_destroy(struct xfrm_policy *policy);
794 
xfrm_pol_put(struct xfrm_policy * policy)795 static inline void xfrm_pol_put(struct xfrm_policy *policy)
796 {
797 	if (refcount_dec_and_test(&policy->refcnt))
798 		xfrm_policy_destroy(policy);
799 }
800 
xfrm_pols_put(struct xfrm_policy ** pols,int npols)801 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
802 {
803 	int i;
804 	for (i = npols - 1; i >= 0; --i)
805 		xfrm_pol_put(pols[i]);
806 }
807 
808 void __xfrm_state_destroy(struct xfrm_state *, bool);
809 
__xfrm_state_put(struct xfrm_state * x)810 static inline void __xfrm_state_put(struct xfrm_state *x)
811 {
812 	refcount_dec(&x->refcnt);
813 }
814 
xfrm_state_put(struct xfrm_state * x)815 static inline void xfrm_state_put(struct xfrm_state *x)
816 {
817 	if (refcount_dec_and_test(&x->refcnt))
818 		__xfrm_state_destroy(x, false);
819 }
820 
xfrm_state_put_sync(struct xfrm_state * x)821 static inline void xfrm_state_put_sync(struct xfrm_state *x)
822 {
823 	if (refcount_dec_and_test(&x->refcnt))
824 		__xfrm_state_destroy(x, true);
825 }
826 
xfrm_state_hold(struct xfrm_state * x)827 static inline void xfrm_state_hold(struct xfrm_state *x)
828 {
829 	refcount_inc(&x->refcnt);
830 }
831 
addr_match(const void * token1,const void * token2,unsigned int prefixlen)832 static inline bool addr_match(const void *token1, const void *token2,
833 			      unsigned int prefixlen)
834 {
835 	const __be32 *a1 = token1;
836 	const __be32 *a2 = token2;
837 	unsigned int pdw;
838 	unsigned int pbi;
839 
840 	pdw = prefixlen >> 5;	  /* num of whole u32 in prefix */
841 	pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
842 
843 	if (pdw)
844 		if (memcmp(a1, a2, pdw << 2))
845 			return false;
846 
847 	if (pbi) {
848 		__be32 mask;
849 
850 		mask = htonl((0xffffffff) << (32 - pbi));
851 
852 		if ((a1[pdw] ^ a2[pdw]) & mask)
853 			return false;
854 	}
855 
856 	return true;
857 }
858 
addr4_match(__be32 a1,__be32 a2,u8 prefixlen)859 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
860 {
861 	/* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
862 	if (sizeof(long) == 4 && prefixlen == 0)
863 		return true;
864 	return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
865 }
866 
867 static __inline__
xfrm_flowi_sport(const struct flowi * fl,const union flowi_uli * uli)868 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
869 {
870 	__be16 port;
871 	switch(fl->flowi_proto) {
872 	case IPPROTO_TCP:
873 	case IPPROTO_UDP:
874 	case IPPROTO_UDPLITE:
875 	case IPPROTO_SCTP:
876 		port = uli->ports.sport;
877 		break;
878 	case IPPROTO_ICMP:
879 	case IPPROTO_ICMPV6:
880 		port = htons(uli->icmpt.type);
881 		break;
882 	case IPPROTO_MH:
883 		port = htons(uli->mht.type);
884 		break;
885 	case IPPROTO_GRE:
886 		port = htons(ntohl(uli->gre_key) >> 16);
887 		break;
888 	default:
889 		port = 0;	/*XXX*/
890 	}
891 	return port;
892 }
893 
894 static __inline__
xfrm_flowi_dport(const struct flowi * fl,const union flowi_uli * uli)895 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
896 {
897 	__be16 port;
898 	switch(fl->flowi_proto) {
899 	case IPPROTO_TCP:
900 	case IPPROTO_UDP:
901 	case IPPROTO_UDPLITE:
902 	case IPPROTO_SCTP:
903 		port = uli->ports.dport;
904 		break;
905 	case IPPROTO_ICMP:
906 	case IPPROTO_ICMPV6:
907 		port = htons(uli->icmpt.code);
908 		break;
909 	case IPPROTO_GRE:
910 		port = htons(ntohl(uli->gre_key) & 0xffff);
911 		break;
912 	default:
913 		port = 0;	/*XXX*/
914 	}
915 	return port;
916 }
917 
918 bool xfrm_selector_match(const struct xfrm_selector *sel,
919 			 const struct flowi *fl, unsigned short family);
920 
921 #ifdef CONFIG_SECURITY_NETWORK_XFRM
922 /*	If neither has a context --> match
923  * 	Otherwise, both must have a context and the sids, doi, alg must match
924  */
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)925 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
926 {
927 	return ((!s1 && !s2) ||
928 		(s1 && s2 &&
929 		 (s1->ctx_sid == s2->ctx_sid) &&
930 		 (s1->ctx_doi == s2->ctx_doi) &&
931 		 (s1->ctx_alg == s2->ctx_alg)));
932 }
933 #else
xfrm_sec_ctx_match(struct xfrm_sec_ctx * s1,struct xfrm_sec_ctx * s2)934 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
935 {
936 	return true;
937 }
938 #endif
939 
940 /* A struct encoding bundle of transformations to apply to some set of flow.
941  *
942  * xdst->child points to the next element of bundle.
943  * dst->xfrm  points to an instanse of transformer.
944  *
945  * Due to unfortunate limitations of current routing cache, which we
946  * have no time to fix, it mirrors struct rtable and bound to the same
947  * routing key, including saddr,daddr. However, we can have many of
948  * bundles differing by session id. All the bundles grow from a parent
949  * policy rule.
950  */
951 struct xfrm_dst {
952 	union {
953 		struct dst_entry	dst;
954 		struct rtable		rt;
955 		struct rt6_info		rt6;
956 	} u;
957 	struct dst_entry *route;
958 	struct dst_entry *child;
959 	struct dst_entry *path;
960 	struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
961 	int num_pols, num_xfrms;
962 	u32 xfrm_genid;
963 	u32 policy_genid;
964 	u32 route_mtu_cached;
965 	u32 child_mtu_cached;
966 	u32 route_cookie;
967 	u32 path_cookie;
968 };
969 
xfrm_dst_path(const struct dst_entry * dst)970 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
971 {
972 #ifdef CONFIG_XFRM
973 	if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
974 		const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
975 
976 		return xdst->path;
977 	}
978 #endif
979 	return (struct dst_entry *) dst;
980 }
981 
xfrm_dst_child(const struct dst_entry * dst)982 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
983 {
984 #ifdef CONFIG_XFRM
985 	if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
986 		struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
987 		return xdst->child;
988 	}
989 #endif
990 	return NULL;
991 }
992 
993 #ifdef CONFIG_XFRM
xfrm_dst_set_child(struct xfrm_dst * xdst,struct dst_entry * child)994 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
995 {
996 	xdst->child = child;
997 }
998 
xfrm_dst_destroy(struct xfrm_dst * xdst)999 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1000 {
1001 	xfrm_pols_put(xdst->pols, xdst->num_pols);
1002 	dst_release(xdst->route);
1003 	if (likely(xdst->u.dst.xfrm))
1004 		xfrm_state_put(xdst->u.dst.xfrm);
1005 }
1006 #endif
1007 
1008 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1009 
1010 struct xfrm_if_parms {
1011 	int link;		/* ifindex of underlying L2 interface */
1012 	u32 if_id;		/* interface identifyer */
1013 	bool collect_md;
1014 };
1015 
1016 struct xfrm_if {
1017 	struct xfrm_if __rcu *next;	/* next interface in list */
1018 	struct net_device *dev;		/* virtual device associated with interface */
1019 	struct net *net;		/* netns for packet i/o */
1020 	struct xfrm_if_parms p;		/* interface parms */
1021 
1022 	struct gro_cells gro_cells;
1023 };
1024 
1025 struct xfrm_offload {
1026 	/* Output sequence number for replay protection on offloading. */
1027 	struct {
1028 		__u32 low;
1029 		__u32 hi;
1030 	} seq;
1031 
1032 	__u32			flags;
1033 #define	SA_DELETE_REQ		1
1034 #define	CRYPTO_DONE		2
1035 #define	CRYPTO_NEXT_DONE	4
1036 #define	CRYPTO_FALLBACK		8
1037 #define	XFRM_GSO_SEGMENT	16
1038 #define	XFRM_GRO		32
1039 /* 64 is free */
1040 #define	XFRM_DEV_RESUME		128
1041 #define	XFRM_XMIT		256
1042 
1043 	__u32			status;
1044 #define CRYPTO_SUCCESS				1
1045 #define CRYPTO_GENERIC_ERROR			2
1046 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED		4
1047 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED	8
1048 #define CRYPTO_TUNNEL_AH_AUTH_FAILED		16
1049 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED		32
1050 #define CRYPTO_INVALID_PACKET_SYNTAX		64
1051 #define CRYPTO_INVALID_PROTOCOL			128
1052 
1053 	/* Used to keep whole l2 header for transport mode GRO */
1054 	__u32			orig_mac_len;
1055 
1056 	__u8			proto;
1057 	__u8			inner_ipproto;
1058 };
1059 
1060 struct sec_path {
1061 	int			len;
1062 	int			olen;
1063 	int			verified_cnt;
1064 
1065 	struct xfrm_state	*xvec[XFRM_MAX_DEPTH];
1066 	struct xfrm_offload	ovec[XFRM_MAX_OFFLOAD_DEPTH];
1067 };
1068 
1069 struct sec_path *secpath_set(struct sk_buff *skb);
1070 
1071 static inline void
secpath_reset(struct sk_buff * skb)1072 secpath_reset(struct sk_buff *skb)
1073 {
1074 #ifdef CONFIG_XFRM
1075 	skb_ext_del(skb, SKB_EXT_SEC_PATH);
1076 #endif
1077 }
1078 
1079 static inline int
xfrm_addr_any(const xfrm_address_t * addr,unsigned short family)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
__xfrm4_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)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
__xfrm6_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x)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
xfrm_state_addr_cmp(const struct xfrm_tmpl * tmpl,const struct xfrm_state * x,unsigned short family)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
xfrm_input_state(struct sk_buff * skb)1118 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1119 {
1120 	struct sec_path *sp = skb_sec_path(skb);
1121 
1122 	return sp->xvec[sp->len - 1];
1123 }
1124 #endif
1125 
xfrm_offload(struct sk_buff * skb)1126 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1127 {
1128 #ifdef CONFIG_XFRM
1129 	struct sec_path *sp = skb_sec_path(skb);
1130 
1131 	if (!sp || !sp->olen || sp->len != sp->olen)
1132 		return NULL;
1133 
1134 	return &sp->ovec[sp->olen - 1];
1135 #else
1136 	return NULL;
1137 #endif
1138 }
1139 
1140 #ifdef CONFIG_XFRM
1141 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1142 			unsigned short family);
1143 
__xfrm_check_nopolicy(struct net * net,struct sk_buff * skb,int dir)1144 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb,
1145 					 int dir)
1146 {
1147 	if (!net->xfrm.policy_count[dir] && !secpath_exists(skb))
1148 		return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT;
1149 
1150 	return false;
1151 }
1152 
__xfrm_check_dev_nopolicy(struct sk_buff * skb,int dir,unsigned short family)1153 static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb,
1154 					     int dir, unsigned short family)
1155 {
1156 	if (dir != XFRM_POLICY_OUT && family == AF_INET) {
1157 		/* same dst may be used for traffic originating from
1158 		 * devices with different policy settings.
1159 		 */
1160 		return IPCB(skb)->flags & IPSKB_NOPOLICY;
1161 	}
1162 	return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY);
1163 }
1164 
__xfrm_policy_check2(struct sock * sk,int dir,struct sk_buff * skb,unsigned int family,int reverse)1165 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1166 				       struct sk_buff *skb,
1167 				       unsigned int family, int reverse)
1168 {
1169 	struct net *net = dev_net(skb->dev);
1170 	int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1171 	struct xfrm_offload *xo = xfrm_offload(skb);
1172 	struct xfrm_state *x;
1173 
1174 	if (sk && sk->sk_policy[XFRM_POLICY_IN])
1175 		return __xfrm_policy_check(sk, ndir, skb, family);
1176 
1177 	if (xo) {
1178 		x = xfrm_input_state(skb);
1179 		if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1180 			return (xo->flags & CRYPTO_DONE) &&
1181 			       (xo->status & CRYPTO_SUCCESS);
1182 	}
1183 
1184 	return __xfrm_check_nopolicy(net, skb, dir) ||
1185 	       __xfrm_check_dev_nopolicy(skb, dir, family) ||
1186 	       __xfrm_policy_check(sk, ndir, skb, family);
1187 }
1188 
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1189 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1190 {
1191 	return __xfrm_policy_check2(sk, dir, skb, family, 0);
1192 }
1193 
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1194 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1195 {
1196 	return xfrm_policy_check(sk, dir, skb, AF_INET);
1197 }
1198 
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1199 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1200 {
1201 	return xfrm_policy_check(sk, dir, skb, AF_INET6);
1202 }
1203 
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1204 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1205 					     struct sk_buff *skb)
1206 {
1207 	return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1208 }
1209 
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1210 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1211 					     struct sk_buff *skb)
1212 {
1213 	return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1214 }
1215 
1216 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1217 			  unsigned int family, int reverse);
1218 
xfrm_decode_session(struct sk_buff * skb,struct flowi * fl,unsigned int family)1219 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1220 				      unsigned int family)
1221 {
1222 	return __xfrm_decode_session(skb, fl, family, 0);
1223 }
1224 
xfrm_decode_session_reverse(struct sk_buff * skb,struct flowi * fl,unsigned int family)1225 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1226 					      struct flowi *fl,
1227 					      unsigned int family)
1228 {
1229 	return __xfrm_decode_session(skb, fl, family, 1);
1230 }
1231 
1232 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1233 
xfrm_route_forward(struct sk_buff * skb,unsigned short family)1234 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1235 {
1236 	struct net *net = dev_net(skb->dev);
1237 
1238 	if (!net->xfrm.policy_count[XFRM_POLICY_OUT] &&
1239 	    net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT)
1240 		return true;
1241 
1242 	return (skb_dst(skb)->flags & DST_NOXFRM) ||
1243 	       __xfrm_route_forward(skb, family);
1244 }
1245 
xfrm4_route_forward(struct sk_buff * skb)1246 static inline int xfrm4_route_forward(struct sk_buff *skb)
1247 {
1248 	return xfrm_route_forward(skb, AF_INET);
1249 }
1250 
xfrm6_route_forward(struct sk_buff * skb)1251 static inline int xfrm6_route_forward(struct sk_buff *skb)
1252 {
1253 	return xfrm_route_forward(skb, AF_INET6);
1254 }
1255 
1256 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1257 
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1258 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1259 {
1260 	if (!sk_fullsock(osk))
1261 		return 0;
1262 	sk->sk_policy[0] = NULL;
1263 	sk->sk_policy[1] = NULL;
1264 	if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1265 		return __xfrm_sk_clone_policy(sk, osk);
1266 	return 0;
1267 }
1268 
1269 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1270 
xfrm_sk_free_policy(struct sock * sk)1271 static inline void xfrm_sk_free_policy(struct sock *sk)
1272 {
1273 	struct xfrm_policy *pol;
1274 
1275 	pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1276 	if (unlikely(pol != NULL)) {
1277 		xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1278 		sk->sk_policy[0] = NULL;
1279 	}
1280 	pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1281 	if (unlikely(pol != NULL)) {
1282 		xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1283 		sk->sk_policy[1] = NULL;
1284 	}
1285 }
1286 
1287 #else
1288 
xfrm_sk_free_policy(struct sock * sk)1289 static inline void xfrm_sk_free_policy(struct sock *sk) {}
xfrm_sk_clone_policy(struct sock * sk,const struct sock * osk)1290 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
xfrm6_route_forward(struct sk_buff * skb)1291 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
xfrm4_route_forward(struct sk_buff * skb)1292 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
xfrm6_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1293 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1294 {
1295 	return 1;
1296 }
xfrm4_policy_check(struct sock * sk,int dir,struct sk_buff * skb)1297 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1298 {
1299 	return 1;
1300 }
xfrm_policy_check(struct sock * sk,int dir,struct sk_buff * skb,unsigned short family)1301 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1302 {
1303 	return 1;
1304 }
xfrm_decode_session_reverse(struct sk_buff * skb,struct flowi * fl,unsigned int family)1305 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1306 					      struct flowi *fl,
1307 					      unsigned int family)
1308 {
1309 	return -ENOSYS;
1310 }
xfrm4_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1311 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1312 					     struct sk_buff *skb)
1313 {
1314 	return 1;
1315 }
xfrm6_policy_check_reverse(struct sock * sk,int dir,struct sk_buff * skb)1316 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1317 					     struct sk_buff *skb)
1318 {
1319 	return 1;
1320 }
1321 #endif
1322 
1323 static __inline__
xfrm_flowi_daddr(const struct flowi * fl,unsigned short family)1324 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1325 {
1326 	switch (family){
1327 	case AF_INET:
1328 		return (xfrm_address_t *)&fl->u.ip4.daddr;
1329 	case AF_INET6:
1330 		return (xfrm_address_t *)&fl->u.ip6.daddr;
1331 	}
1332 	return NULL;
1333 }
1334 
1335 static __inline__
xfrm_flowi_saddr(const struct flowi * fl,unsigned short family)1336 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1337 {
1338 	switch (family){
1339 	case AF_INET:
1340 		return (xfrm_address_t *)&fl->u.ip4.saddr;
1341 	case AF_INET6:
1342 		return (xfrm_address_t *)&fl->u.ip6.saddr;
1343 	}
1344 	return NULL;
1345 }
1346 
1347 static __inline__
xfrm_flowi_addr_get(const struct flowi * fl,xfrm_address_t * saddr,xfrm_address_t * daddr,unsigned short family)1348 void xfrm_flowi_addr_get(const struct flowi *fl,
1349 			 xfrm_address_t *saddr, xfrm_address_t *daddr,
1350 			 unsigned short family)
1351 {
1352 	switch(family) {
1353 	case AF_INET:
1354 		memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1355 		memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1356 		break;
1357 	case AF_INET6:
1358 		saddr->in6 = fl->u.ip6.saddr;
1359 		daddr->in6 = fl->u.ip6.daddr;
1360 		break;
1361 	}
1362 }
1363 
1364 static __inline__ int
__xfrm4_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1365 __xfrm4_state_addr_check(const struct xfrm_state *x,
1366 			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1367 {
1368 	if (daddr->a4 == x->id.daddr.a4 &&
1369 	    (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1370 		return 1;
1371 	return 0;
1372 }
1373 
1374 static __inline__ int
__xfrm6_state_addr_check(const struct xfrm_state * x,const xfrm_address_t * daddr,const xfrm_address_t * saddr)1375 __xfrm6_state_addr_check(const struct xfrm_state *x,
1376 			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1377 {
1378 	if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1379 	    (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1380 	     ipv6_addr_any((struct in6_addr *)saddr) ||
1381 	     ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1382 		return 1;
1383 	return 0;
1384 }
1385 
1386 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)1387 xfrm_state_addr_check(const struct xfrm_state *x,
1388 		      const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1389 		      unsigned short family)
1390 {
1391 	switch (family) {
1392 	case AF_INET:
1393 		return __xfrm4_state_addr_check(x, daddr, saddr);
1394 	case AF_INET6:
1395 		return __xfrm6_state_addr_check(x, daddr, saddr);
1396 	}
1397 	return 0;
1398 }
1399 
1400 static __inline__ int
xfrm_state_addr_flow_check(const struct xfrm_state * x,const struct flowi * fl,unsigned short family)1401 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1402 			   unsigned short family)
1403 {
1404 	switch (family) {
1405 	case AF_INET:
1406 		return __xfrm4_state_addr_check(x,
1407 						(const xfrm_address_t *)&fl->u.ip4.daddr,
1408 						(const xfrm_address_t *)&fl->u.ip4.saddr);
1409 	case AF_INET6:
1410 		return __xfrm6_state_addr_check(x,
1411 						(const xfrm_address_t *)&fl->u.ip6.daddr,
1412 						(const xfrm_address_t *)&fl->u.ip6.saddr);
1413 	}
1414 	return 0;
1415 }
1416 
xfrm_state_kern(const struct xfrm_state * x)1417 static inline int xfrm_state_kern(const struct xfrm_state *x)
1418 {
1419 	return atomic_read(&x->tunnel_users);
1420 }
1421 
xfrm_id_proto_valid(u8 proto)1422 static inline bool xfrm_id_proto_valid(u8 proto)
1423 {
1424 	switch (proto) {
1425 	case IPPROTO_AH:
1426 	case IPPROTO_ESP:
1427 	case IPPROTO_COMP:
1428 #if IS_ENABLED(CONFIG_IPV6)
1429 	case IPPROTO_ROUTING:
1430 	case IPPROTO_DSTOPTS:
1431 #endif
1432 		return true;
1433 	default:
1434 		return false;
1435 	}
1436 }
1437 
1438 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
xfrm_id_proto_match(u8 proto,u8 userproto)1439 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1440 {
1441 	return (!userproto || proto == userproto ||
1442 		(userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1443 						  proto == IPPROTO_ESP ||
1444 						  proto == IPPROTO_COMP)));
1445 }
1446 
1447 /*
1448  * xfrm algorithm information
1449  */
1450 struct xfrm_algo_aead_info {
1451 	char *geniv;
1452 	u16 icv_truncbits;
1453 };
1454 
1455 struct xfrm_algo_auth_info {
1456 	u16 icv_truncbits;
1457 	u16 icv_fullbits;
1458 };
1459 
1460 struct xfrm_algo_encr_info {
1461 	char *geniv;
1462 	u16 blockbits;
1463 	u16 defkeybits;
1464 };
1465 
1466 struct xfrm_algo_comp_info {
1467 	u16 threshold;
1468 };
1469 
1470 struct xfrm_algo_desc {
1471 	char *name;
1472 	char *compat;
1473 	u8 available:1;
1474 	u8 pfkey_supported:1;
1475 	union {
1476 		struct xfrm_algo_aead_info aead;
1477 		struct xfrm_algo_auth_info auth;
1478 		struct xfrm_algo_encr_info encr;
1479 		struct xfrm_algo_comp_info comp;
1480 	} uinfo;
1481 	struct sadb_alg desc;
1482 };
1483 
1484 /* XFRM protocol handlers.  */
1485 struct xfrm4_protocol {
1486 	int (*handler)(struct sk_buff *skb);
1487 	int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1488 			     int encap_type);
1489 	int (*cb_handler)(struct sk_buff *skb, int err);
1490 	int (*err_handler)(struct sk_buff *skb, u32 info);
1491 
1492 	struct xfrm4_protocol __rcu *next;
1493 	int priority;
1494 };
1495 
1496 struct xfrm6_protocol {
1497 	int (*handler)(struct sk_buff *skb);
1498 	int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1499 			     int encap_type);
1500 	int (*cb_handler)(struct sk_buff *skb, int err);
1501 	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1502 			   u8 type, u8 code, int offset, __be32 info);
1503 
1504 	struct xfrm6_protocol __rcu *next;
1505 	int priority;
1506 };
1507 
1508 /* XFRM tunnel handlers.  */
1509 struct xfrm_tunnel {
1510 	int (*handler)(struct sk_buff *skb);
1511 	int (*cb_handler)(struct sk_buff *skb, int err);
1512 	int (*err_handler)(struct sk_buff *skb, u32 info);
1513 
1514 	struct xfrm_tunnel __rcu *next;
1515 	int priority;
1516 };
1517 
1518 struct xfrm6_tunnel {
1519 	int (*handler)(struct sk_buff *skb);
1520 	int (*cb_handler)(struct sk_buff *skb, int err);
1521 	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1522 			   u8 type, u8 code, int offset, __be32 info);
1523 	struct xfrm6_tunnel __rcu *next;
1524 	int priority;
1525 };
1526 
1527 void xfrm_init(void);
1528 void xfrm4_init(void);
1529 int xfrm_state_init(struct net *net);
1530 void xfrm_state_fini(struct net *net);
1531 void xfrm4_state_init(void);
1532 void xfrm4_protocol_init(void);
1533 #ifdef CONFIG_XFRM
1534 int xfrm6_init(void);
1535 void xfrm6_fini(void);
1536 int xfrm6_state_init(void);
1537 void xfrm6_state_fini(void);
1538 int xfrm6_protocol_init(void);
1539 void xfrm6_protocol_fini(void);
1540 #else
xfrm6_init(void)1541 static inline int xfrm6_init(void)
1542 {
1543 	return 0;
1544 }
xfrm6_fini(void)1545 static inline void xfrm6_fini(void)
1546 {
1547 	;
1548 }
1549 #endif
1550 
1551 #ifdef CONFIG_XFRM_STATISTICS
1552 int xfrm_proc_init(struct net *net);
1553 void xfrm_proc_fini(struct net *net);
1554 #endif
1555 
1556 int xfrm_sysctl_init(struct net *net);
1557 #ifdef CONFIG_SYSCTL
1558 void xfrm_sysctl_fini(struct net *net);
1559 #else
xfrm_sysctl_fini(struct net * net)1560 static inline void xfrm_sysctl_fini(struct net *net)
1561 {
1562 }
1563 #endif
1564 
1565 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1566 			  struct xfrm_address_filter *filter);
1567 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1568 		    int (*func)(struct xfrm_state *, int, void*), void *);
1569 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1570 struct xfrm_state *xfrm_state_alloc(struct net *net);
1571 void xfrm_state_free(struct xfrm_state *x);
1572 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1573 				   const xfrm_address_t *saddr,
1574 				   const struct flowi *fl,
1575 				   struct xfrm_tmpl *tmpl,
1576 				   struct xfrm_policy *pol, int *err,
1577 				   unsigned short family, u32 if_id);
1578 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1579 				       xfrm_address_t *daddr,
1580 				       xfrm_address_t *saddr,
1581 				       unsigned short family,
1582 				       u8 mode, u8 proto, u32 reqid);
1583 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1584 					      unsigned short family);
1585 int xfrm_state_check_expire(struct xfrm_state *x);
1586 #ifdef CONFIG_XFRM_OFFLOAD
xfrm_dev_state_update_curlft(struct xfrm_state * x)1587 static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x)
1588 {
1589 	struct xfrm_dev_offload *xdo = &x->xso;
1590 	struct net_device *dev = READ_ONCE(xdo->dev);
1591 
1592 	if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1593 		return;
1594 
1595 	if (dev && dev->xfrmdev_ops &&
1596 	    dev->xfrmdev_ops->xdo_dev_state_update_curlft)
1597 		dev->xfrmdev_ops->xdo_dev_state_update_curlft(x);
1598 
1599 }
1600 #else
xfrm_dev_state_update_curlft(struct xfrm_state * x)1601 static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) {}
1602 #endif
1603 void xfrm_state_insert(struct xfrm_state *x);
1604 int xfrm_state_add(struct xfrm_state *x);
1605 int xfrm_state_update(struct xfrm_state *x);
1606 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1607 				     const xfrm_address_t *daddr, __be32 spi,
1608 				     u8 proto, unsigned short family);
1609 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1610 					    const xfrm_address_t *daddr,
1611 					    const xfrm_address_t *saddr,
1612 					    u8 proto,
1613 					    unsigned short family);
1614 #ifdef CONFIG_XFRM_SUB_POLICY
1615 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1616 		    unsigned short family);
1617 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1618 		     unsigned short family);
1619 #else
xfrm_tmpl_sort(struct xfrm_tmpl ** d,struct xfrm_tmpl ** s,int n,unsigned short family)1620 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1621 				  int n, unsigned short family)
1622 {
1623 }
1624 
xfrm_state_sort(struct xfrm_state ** d,struct xfrm_state ** s,int n,unsigned short family)1625 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1626 				   int n, unsigned short family)
1627 {
1628 }
1629 #endif
1630 
1631 struct xfrmk_sadinfo {
1632 	u32 sadhcnt; /* current hash bkts */
1633 	u32 sadhmcnt; /* max allowed hash bkts */
1634 	u32 sadcnt; /* current running count */
1635 };
1636 
1637 struct xfrmk_spdinfo {
1638 	u32 incnt;
1639 	u32 outcnt;
1640 	u32 fwdcnt;
1641 	u32 inscnt;
1642 	u32 outscnt;
1643 	u32 fwdscnt;
1644 	u32 spdhcnt;
1645 	u32 spdhmcnt;
1646 };
1647 
1648 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1649 int xfrm_state_delete(struct xfrm_state *x);
1650 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1651 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1652 int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1653 			  bool task_valid);
1654 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1655 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1656 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1657 int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack);
1658 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1659 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
1660 		      struct netlink_ext_ack *extack);
1661 int xfrm_init_state(struct xfrm_state *x);
1662 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1663 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1664 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
1665 			 int (*finish)(struct net *, struct sock *,
1666 				       struct sk_buff *));
1667 int xfrm_trans_queue(struct sk_buff *skb,
1668 		     int (*finish)(struct net *, struct sock *,
1669 				   struct sk_buff *));
1670 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err);
1671 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1672 
1673 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1674 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1675 #endif
1676 
1677 void xfrm_local_error(struct sk_buff *skb, int mtu);
1678 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1679 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1680 		    int encap_type);
1681 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1682 int xfrm4_rcv(struct sk_buff *skb);
1683 
xfrm4_rcv_spi(struct sk_buff * skb,int nexthdr,__be32 spi)1684 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1685 {
1686 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1687 	XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1688 	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1689 	return xfrm_input(skb, nexthdr, spi, 0);
1690 }
1691 
1692 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1693 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1694 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1695 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1696 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1697 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1698 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1699 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1700 		  struct ip6_tnl *t);
1701 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1702 		    int encap_type);
1703 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1704 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1705 int xfrm6_rcv(struct sk_buff *skb);
1706 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1707 		     xfrm_address_t *saddr, u8 proto);
1708 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1709 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1710 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1711 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1712 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1713 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1714 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1715 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1716 
1717 #ifdef CONFIG_XFRM
1718 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
1719 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1720 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1721 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval,
1722 		     int optlen);
1723 #else
xfrm_user_policy(struct sock * sk,int optname,sockptr_t optval,int optlen)1724 static inline int xfrm_user_policy(struct sock *sk, int optname,
1725 				   sockptr_t optval, int optlen)
1726 {
1727  	return -ENOPROTOOPT;
1728 }
1729 #endif
1730 
1731 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1732 				    const xfrm_address_t *saddr,
1733 				    const xfrm_address_t *daddr,
1734 				    int family, u32 mark);
1735 
1736 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1737 
1738 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1739 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1740 		     int (*func)(struct xfrm_policy *, int, int, void*),
1741 		     void *);
1742 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1743 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1744 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net,
1745 					  const struct xfrm_mark *mark,
1746 					  u32 if_id, u8 type, int dir,
1747 					  struct xfrm_selector *sel,
1748 					  struct xfrm_sec_ctx *ctx, int delete,
1749 					  int *err);
1750 struct xfrm_policy *xfrm_policy_byid(struct net *net,
1751 				     const struct xfrm_mark *mark, u32 if_id,
1752 				     u8 type, int dir, u32 id, int delete,
1753 				     int *err);
1754 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1755 void xfrm_policy_hash_rebuild(struct net *net);
1756 u32 xfrm_get_acqseq(void);
1757 int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
1758 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
1759 		   struct netlink_ext_ack *extack);
1760 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1761 				 u8 mode, u32 reqid, u32 if_id, u8 proto,
1762 				 const xfrm_address_t *daddr,
1763 				 const xfrm_address_t *saddr, int create,
1764 				 unsigned short family);
1765 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1766 
1767 #ifdef CONFIG_XFRM_MIGRATE
1768 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1769 	       const struct xfrm_migrate *m, int num_bundles,
1770 	       const struct xfrm_kmaddress *k,
1771 	       const struct xfrm_encap_tmpl *encap);
1772 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1773 						u32 if_id);
1774 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1775 				      struct xfrm_migrate *m,
1776 				      struct xfrm_encap_tmpl *encap);
1777 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1778 		 struct xfrm_migrate *m, int num_bundles,
1779 		 struct xfrm_kmaddress *k, struct net *net,
1780 		 struct xfrm_encap_tmpl *encap, u32 if_id,
1781 		 struct netlink_ext_ack *extack);
1782 #endif
1783 
1784 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1785 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1786 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1787 	      xfrm_address_t *addr);
1788 
1789 void xfrm_input_init(void);
1790 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1791 
1792 void xfrm_probe_algs(void);
1793 int xfrm_count_pfkey_auth_supported(void);
1794 int xfrm_count_pfkey_enc_supported(void);
1795 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1796 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1797 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1798 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1799 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1800 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1801 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1802 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1803 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1804 					    int probe);
1805 
xfrm6_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b)1806 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1807 				    const xfrm_address_t *b)
1808 {
1809 	return ipv6_addr_equal((const struct in6_addr *)a,
1810 			       (const struct in6_addr *)b);
1811 }
1812 
xfrm_addr_equal(const xfrm_address_t * a,const xfrm_address_t * b,sa_family_t family)1813 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1814 				   const xfrm_address_t *b,
1815 				   sa_family_t family)
1816 {
1817 	switch (family) {
1818 	default:
1819 	case AF_INET:
1820 		return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1821 	case AF_INET6:
1822 		return xfrm6_addr_equal(a, b);
1823 	}
1824 }
1825 
xfrm_policy_id2dir(u32 index)1826 static inline int xfrm_policy_id2dir(u32 index)
1827 {
1828 	return index & 7;
1829 }
1830 
1831 #ifdef CONFIG_XFRM
1832 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
1833 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1834 void xfrm_replay_notify(struct xfrm_state *x, int event);
1835 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
1836 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
1837 
xfrm_aevent_is_on(struct net * net)1838 static inline int xfrm_aevent_is_on(struct net *net)
1839 {
1840 	struct sock *nlsk;
1841 	int ret = 0;
1842 
1843 	rcu_read_lock();
1844 	nlsk = rcu_dereference(net->xfrm.nlsk);
1845 	if (nlsk)
1846 		ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1847 	rcu_read_unlock();
1848 	return ret;
1849 }
1850 
xfrm_acquire_is_on(struct net * net)1851 static inline int xfrm_acquire_is_on(struct net *net)
1852 {
1853 	struct sock *nlsk;
1854 	int ret = 0;
1855 
1856 	rcu_read_lock();
1857 	nlsk = rcu_dereference(net->xfrm.nlsk);
1858 	if (nlsk)
1859 		ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1860 	rcu_read_unlock();
1861 
1862 	return ret;
1863 }
1864 #endif
1865 
aead_len(struct xfrm_algo_aead * alg)1866 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1867 {
1868 	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1869 }
1870 
xfrm_alg_len(const struct xfrm_algo * alg)1871 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1872 {
1873 	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1874 }
1875 
xfrm_alg_auth_len(const struct xfrm_algo_auth * alg)1876 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1877 {
1878 	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1879 }
1880 
xfrm_replay_state_esn_len(struct xfrm_replay_state_esn * replay_esn)1881 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1882 {
1883 	return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1884 }
1885 
1886 #ifdef CONFIG_XFRM_MIGRATE
xfrm_replay_clone(struct xfrm_state * x,struct xfrm_state * orig)1887 static inline int xfrm_replay_clone(struct xfrm_state *x,
1888 				     struct xfrm_state *orig)
1889 {
1890 
1891 	x->replay_esn = kmemdup(orig->replay_esn,
1892 				xfrm_replay_state_esn_len(orig->replay_esn),
1893 				GFP_KERNEL);
1894 	if (!x->replay_esn)
1895 		return -ENOMEM;
1896 	x->preplay_esn = kmemdup(orig->preplay_esn,
1897 				 xfrm_replay_state_esn_len(orig->preplay_esn),
1898 				 GFP_KERNEL);
1899 	if (!x->preplay_esn)
1900 		return -ENOMEM;
1901 
1902 	return 0;
1903 }
1904 
xfrm_algo_aead_clone(struct xfrm_algo_aead * orig)1905 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1906 {
1907 	return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1908 }
1909 
1910 
xfrm_algo_clone(struct xfrm_algo * orig)1911 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1912 {
1913 	return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1914 }
1915 
xfrm_algo_auth_clone(struct xfrm_algo_auth * orig)1916 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1917 {
1918 	return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1919 }
1920 
xfrm_states_put(struct xfrm_state ** states,int n)1921 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1922 {
1923 	int i;
1924 	for (i = 0; i < n; i++)
1925 		xfrm_state_put(*(states + i));
1926 }
1927 
xfrm_states_delete(struct xfrm_state ** states,int n)1928 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1929 {
1930 	int i;
1931 	for (i = 0; i < n; i++)
1932 		xfrm_state_delete(*(states + i));
1933 }
1934 #endif
1935 
1936 void __init xfrm_dev_init(void);
1937 
1938 #ifdef CONFIG_XFRM_OFFLOAD
1939 void xfrm_dev_resume(struct sk_buff *skb);
1940 void xfrm_dev_backlog(struct softnet_data *sd);
1941 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1942 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1943 		       struct xfrm_user_offload *xuo,
1944 		       struct netlink_ext_ack *extack);
1945 int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
1946 			struct xfrm_user_offload *xuo, u8 dir,
1947 			struct netlink_ext_ack *extack);
1948 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1949 void xfrm_dev_state_delete(struct xfrm_state *x);
1950 void xfrm_dev_state_free(struct xfrm_state *x);
1951 
xfrm_dev_state_advance_esn(struct xfrm_state * x)1952 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1953 {
1954 	struct xfrm_dev_offload *xso = &x->xso;
1955 	struct net_device *dev = READ_ONCE(xso->dev);
1956 
1957 	if (dev && dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1958 		dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1959 }
1960 
xfrm_dst_offload_ok(struct dst_entry * dst)1961 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1962 {
1963 	struct xfrm_state *x = dst->xfrm;
1964 	struct xfrm_dst *xdst;
1965 
1966 	if (!x || !x->type_offload)
1967 		return false;
1968 
1969 	xdst = (struct xfrm_dst *) dst;
1970 	if (!x->xso.offload_handle && !xdst->child->xfrm)
1971 		return true;
1972 	if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1973 	    !xdst->child->xfrm)
1974 		return true;
1975 
1976 	return false;
1977 }
1978 
xfrm_dev_policy_delete(struct xfrm_policy * x)1979 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
1980 {
1981 	struct xfrm_dev_offload *xdo = &x->xdo;
1982 	struct net_device *dev = xdo->dev;
1983 
1984 	if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete)
1985 		dev->xfrmdev_ops->xdo_dev_policy_delete(x);
1986 }
1987 
xfrm_dev_policy_free(struct xfrm_policy * x)1988 static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
1989 {
1990 	struct xfrm_dev_offload *xdo = &x->xdo;
1991 	struct net_device *dev = xdo->dev;
1992 
1993 	if (dev && dev->xfrmdev_ops) {
1994 		if (dev->xfrmdev_ops->xdo_dev_policy_free)
1995 			dev->xfrmdev_ops->xdo_dev_policy_free(x);
1996 		xdo->dev = NULL;
1997 		netdev_put(dev, &xdo->dev_tracker);
1998 	}
1999 }
2000 #else
xfrm_dev_resume(struct sk_buff * skb)2001 static inline void xfrm_dev_resume(struct sk_buff *skb)
2002 {
2003 }
2004 
xfrm_dev_backlog(struct softnet_data * sd)2005 static inline void xfrm_dev_backlog(struct softnet_data *sd)
2006 {
2007 }
2008 
validate_xmit_xfrm(struct sk_buff * skb,netdev_features_t features,bool * again)2009 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
2010 {
2011 	return skb;
2012 }
2013 
xfrm_dev_state_add(struct net * net,struct xfrm_state * x,struct xfrm_user_offload * xuo,struct netlink_ext_ack * extack)2014 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack)
2015 {
2016 	return 0;
2017 }
2018 
xfrm_dev_state_delete(struct xfrm_state * x)2019 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
2020 {
2021 }
2022 
xfrm_dev_state_free(struct xfrm_state * x)2023 static inline void xfrm_dev_state_free(struct xfrm_state *x)
2024 {
2025 }
2026 
xfrm_dev_policy_add(struct net * net,struct xfrm_policy * xp,struct xfrm_user_offload * xuo,u8 dir,struct netlink_ext_ack * extack)2027 static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
2028 				      struct xfrm_user_offload *xuo, u8 dir,
2029 				      struct netlink_ext_ack *extack)
2030 {
2031 	return 0;
2032 }
2033 
xfrm_dev_policy_delete(struct xfrm_policy * x)2034 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x)
2035 {
2036 }
2037 
xfrm_dev_policy_free(struct xfrm_policy * x)2038 static inline void xfrm_dev_policy_free(struct xfrm_policy *x)
2039 {
2040 }
2041 
xfrm_dev_offload_ok(struct sk_buff * skb,struct xfrm_state * x)2042 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
2043 {
2044 	return false;
2045 }
2046 
xfrm_dev_state_advance_esn(struct xfrm_state * x)2047 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
2048 {
2049 }
2050 
xfrm_dst_offload_ok(struct dst_entry * dst)2051 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
2052 {
2053 	return false;
2054 }
2055 #endif
2056 
xfrm_mark_get(struct nlattr ** attrs,struct xfrm_mark * m)2057 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
2058 {
2059 	if (attrs[XFRMA_MARK])
2060 		memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2061 	else
2062 		m->v = m->m = 0;
2063 
2064 	return m->v & m->m;
2065 }
2066 
xfrm_mark_put(struct sk_buff * skb,const struct xfrm_mark * m)2067 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2068 {
2069 	int ret = 0;
2070 
2071 	if (m->m | m->v)
2072 		ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2073 	return ret;
2074 }
2075 
xfrm_smark_get(__u32 mark,struct xfrm_state * x)2076 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
2077 {
2078 	struct xfrm_mark *m = &x->props.smark;
2079 
2080 	return (m->v & m->m) | (mark & ~m->m);
2081 }
2082 
xfrm_if_id_put(struct sk_buff * skb,__u32 if_id)2083 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2084 {
2085 	int ret = 0;
2086 
2087 	if (if_id)
2088 		ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2089 	return ret;
2090 }
2091 
xfrm_tunnel_check(struct sk_buff * skb,struct xfrm_state * x,unsigned int family)2092 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2093 				    unsigned int family)
2094 {
2095 	bool tunnel = false;
2096 
2097 	switch(family) {
2098 	case AF_INET:
2099 		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2100 			tunnel = true;
2101 		break;
2102 	case AF_INET6:
2103 		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2104 			tunnel = true;
2105 		break;
2106 	}
2107 	if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
2108 		return -EINVAL;
2109 
2110 	return 0;
2111 }
2112 
2113 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
2114 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
2115 
2116 struct xfrm_translator {
2117 	/* Allocate frag_list and put compat translation there */
2118 	int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
2119 
2120 	/* Allocate nlmsg with 64-bit translaton of received 32-bit message */
2121 	struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
2122 			int maxtype, const struct nla_policy *policy,
2123 			struct netlink_ext_ack *extack);
2124 
2125 	/* Translate 32-bit user_policy from sockptr */
2126 	int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
2127 
2128 	struct module *owner;
2129 };
2130 
2131 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2132 extern int xfrm_register_translator(struct xfrm_translator *xtr);
2133 extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
2134 extern struct xfrm_translator *xfrm_get_translator(void);
2135 extern void xfrm_put_translator(struct xfrm_translator *xtr);
2136 #else
xfrm_get_translator(void)2137 static inline struct xfrm_translator *xfrm_get_translator(void)
2138 {
2139 	return NULL;
2140 }
xfrm_put_translator(struct xfrm_translator * xtr)2141 static inline void xfrm_put_translator(struct xfrm_translator *xtr)
2142 {
2143 }
2144 #endif
2145 
2146 #if IS_ENABLED(CONFIG_IPV6)
xfrm6_local_dontfrag(const struct sock * sk)2147 static inline bool xfrm6_local_dontfrag(const struct sock *sk)
2148 {
2149 	int proto;
2150 
2151 	if (!sk || sk->sk_family != AF_INET6)
2152 		return false;
2153 
2154 	proto = sk->sk_protocol;
2155 	if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
2156 		return inet6_sk(sk)->dontfrag;
2157 
2158 	return false;
2159 }
2160 #endif
2161 
2162 #if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
2163     (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
2164 
2165 extern struct metadata_dst __percpu *xfrm_bpf_md_dst;
2166 
2167 int register_xfrm_interface_bpf(void);
2168 
2169 #else
2170 
register_xfrm_interface_bpf(void)2171 static inline int register_xfrm_interface_bpf(void)
2172 {
2173 	return 0;
2174 }
2175 
2176 #endif
2177 
2178 #endif	/* _NET_XFRM_H */
2179