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