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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
19 #include <net/sock.h>
20 #include <net/dst.h>
21 #include <net/ip.h>
22 #include <net/route.h>
23 #include <net/ipv6.h>
24 #include <net/ip6_fib.h>
25 #include <net/flow.h>
26 #include <net/gro_cells.h>
27
28 #include <linux/interrupt.h>
29
30 #ifdef CONFIG_XFRM_STATISTICS
31 #include <net/snmp.h>
32 #endif
33
34 #define XFRM_PROTO_ESP 50
35 #define XFRM_PROTO_AH 51
36 #define XFRM_PROTO_COMP 108
37 #define XFRM_PROTO_IPIP 4
38 #define XFRM_PROTO_IPV6 41
39 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
40 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
41
42 #define XFRM_ALIGN4(len) (((len) + 3) & ~3)
43 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
44 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
45 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
46 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
47 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
48 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
49 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
50
51 #ifdef CONFIG_XFRM_STATISTICS
52 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
53 #else
54 #define XFRM_INC_STATS(net, field) ((void)(net))
55 #endif
56
57
58 /* Organization of SPD aka "XFRM rules"
59 ------------------------------------
60
61 Basic objects:
62 - policy rule, struct xfrm_policy (=SPD entry)
63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
64 - instance of a transformer, struct xfrm_state (=SA)
65 - template to clone xfrm_state, struct xfrm_tmpl
66
67 SPD is plain linear list of xfrm_policy rules, ordered by priority.
68 (To be compatible with existing pfkeyv2 implementations,
69 many rules with priority of 0x7fffffff are allowed to exist and
70 such rules are ordered in an unpredictable way, thanks to bsd folks.)
71
72 Lookup is plain linear search until the first match with selector.
73
74 If "action" is "block", then we prohibit the flow, otherwise:
75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
76 policy entry has list of up to XFRM_MAX_DEPTH transformations,
77 described by templates xfrm_tmpl. Each template is resolved
78 to a complete xfrm_state (see below) and we pack bundle of transformations
79 to a dst_entry returned to requestor.
80
81 dst -. xfrm .-> xfrm_state #1
82 |---. child .-> dst -. xfrm .-> xfrm_state #2
83 |---. child .-> dst -. xfrm .-> xfrm_state #3
84 |---. child .-> NULL
85
86 Bundles are cached at xrfm_policy struct (field ->bundles).
87
88
89 Resolution of xrfm_tmpl
90 -----------------------
91 Template contains:
92 1. ->mode Mode: transport or tunnel
93 2. ->id.proto Protocol: AH/ESP/IPCOMP
94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
95 Q: allow to resolve security gateway?
96 4. ->id.spi If not zero, static SPI.
97 5. ->saddr Local tunnel endpoint, ignored for transport mode.
98 6. ->algos List of allowed algos. Plain bitmask now.
99 Q: ealgos, aalgos, calgos. What a mess...
100 7. ->share Sharing mode.
101 Q: how to implement private sharing mode? To add struct sock* to
102 flow id?
103
104 Having this template we search through SAD searching for entries
105 with appropriate mode/proto/algo, permitted by selector.
106 If no appropriate entry found, it is requested from key manager.
107
108 PROBLEMS:
109 Q: How to find all the bundles referring to a physical path for
110 PMTU discovery? Seems, dst should contain list of all parents...
111 and enter to infinite locking hierarchy disaster.
112 No! It is easier, we will not search for them, let them find us.
113 We add genid to each dst plus pointer to genid of raw IP route,
114 pmtu disc will update pmtu on raw IP route and increase its genid.
115 dst_check() will see this for top level and trigger resyncing
116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
117 */
118
119 struct xfrm_state_walk {
120 struct list_head all;
121 u8 state;
122 u8 dying;
123 u8 proto;
124 u32 seq;
125 struct xfrm_address_filter *filter;
126 };
127
128 struct xfrm_state_offload {
129 struct net_device *dev;
130 unsigned long offload_handle;
131 unsigned int num_exthdrs;
132 u8 flags;
133 };
134
135 /* Full description of state of transformer. */
136 struct xfrm_state {
137 possible_net_t xs_net;
138 union {
139 struct hlist_node gclist;
140 struct hlist_node bydst;
141 };
142 struct hlist_node bysrc;
143 struct hlist_node byspi;
144
145 refcount_t refcnt;
146 spinlock_t lock;
147
148 struct xfrm_id id;
149 struct xfrm_selector sel;
150 struct xfrm_mark mark;
151 u32 if_id;
152 u32 tfcpad;
153
154 u32 genid;
155
156 /* Key manager bits */
157 struct xfrm_state_walk km;
158
159 /* Parameters of this state. */
160 struct {
161 u32 reqid;
162 u8 mode;
163 u8 replay_window;
164 u8 aalgo, ealgo, calgo;
165 u8 flags;
166 u16 family;
167 xfrm_address_t saddr;
168 int header_len;
169 int trailer_len;
170 u32 extra_flags;
171 struct xfrm_mark smark;
172 } props;
173
174 struct xfrm_lifetime_cfg lft;
175
176 /* Data for transformer */
177 struct xfrm_algo_auth *aalg;
178 struct xfrm_algo *ealg;
179 struct xfrm_algo *calg;
180 struct xfrm_algo_aead *aead;
181 const char *geniv;
182
183 /* Data for encapsulator */
184 struct xfrm_encap_tmpl *encap;
185
186 /* Data for care-of address */
187 xfrm_address_t *coaddr;
188
189 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
190 struct xfrm_state *tunnel;
191
192 /* If a tunnel, number of users + 1 */
193 atomic_t tunnel_users;
194
195 /* State for replay detection */
196 struct xfrm_replay_state replay;
197 struct xfrm_replay_state_esn *replay_esn;
198
199 /* Replay detection state at the time we sent the last notification */
200 struct xfrm_replay_state preplay;
201 struct xfrm_replay_state_esn *preplay_esn;
202
203 /* The functions for replay detection. */
204 const struct xfrm_replay *repl;
205
206 /* internal flag that only holds state for delayed aevent at the
207 * moment
208 */
209 u32 xflags;
210
211 /* Replay detection notification settings */
212 u32 replay_maxage;
213 u32 replay_maxdiff;
214
215 /* Replay detection notification timer */
216 struct timer_list rtimer;
217
218 /* Statistics */
219 struct xfrm_stats stats;
220
221 struct xfrm_lifetime_cur curlft;
222 struct tasklet_hrtimer mtimer;
223
224 struct xfrm_state_offload xso;
225
226 /* used to fix curlft->add_time when changing date */
227 long saved_tmo;
228
229 /* Last used time */
230 time64_t lastused;
231
232 struct page_frag xfrag;
233
234 /* Reference to data common to all the instances of this
235 * transformer. */
236 const struct xfrm_type *type;
237 struct xfrm_mode *inner_mode;
238 struct xfrm_mode *inner_mode_iaf;
239 struct xfrm_mode *outer_mode;
240
241 const struct xfrm_type_offload *type_offload;
242
243 /* Security context */
244 struct xfrm_sec_ctx *security;
245
246 /* Private data of this transformer, format is opaque,
247 * interpreted by xfrm_type methods. */
248 void *data;
249 };
250
251 static inline struct net *xs_net(struct xfrm_state *x)
252 {
253 return read_pnet(&x->xs_net);
254 }
255
256 /* xflags - make enum if more show up */
257 #define XFRM_TIME_DEFER 1
258 #define XFRM_SOFT_EXPIRE 2
259
260 enum {
261 XFRM_STATE_VOID,
262 XFRM_STATE_ACQ,
263 XFRM_STATE_VALID,
264 XFRM_STATE_ERROR,
265 XFRM_STATE_EXPIRED,
266 XFRM_STATE_DEAD
267 };
268
269 /* callback structure passed from either netlink or pfkey */
270 struct km_event {
271 union {
272 u32 hard;
273 u32 proto;
274 u32 byid;
275 u32 aevent;
276 u32 type;
277 } data;
278
279 u32 seq;
280 u32 portid;
281 u32 event;
282 struct net *net;
283 };
284
285 struct xfrm_replay {
286 void (*advance)(struct xfrm_state *x, __be32 net_seq);
287 int (*check)(struct xfrm_state *x,
288 struct sk_buff *skb,
289 __be32 net_seq);
290 int (*recheck)(struct xfrm_state *x,
291 struct sk_buff *skb,
292 __be32 net_seq);
293 void (*notify)(struct xfrm_state *x, int event);
294 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
295 };
296
297 struct xfrm_if_cb {
298 struct xfrm_if *(*decode_session)(struct sk_buff *skb);
299 };
300
301 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
302 void xfrm_if_unregister_cb(void);
303
304 struct net_device;
305 struct xfrm_type;
306 struct xfrm_dst;
307 struct xfrm_policy_afinfo {
308 struct dst_ops *dst_ops;
309 struct dst_entry *(*dst_lookup)(struct net *net,
310 int tos, int oif,
311 const xfrm_address_t *saddr,
312 const xfrm_address_t *daddr,
313 u32 mark);
314 int (*get_saddr)(struct net *net, int oif,
315 xfrm_address_t *saddr,
316 xfrm_address_t *daddr,
317 u32 mark);
318 void (*decode_session)(struct sk_buff *skb,
319 struct flowi *fl,
320 int reverse);
321 int (*get_tos)(const struct flowi *fl);
322 int (*init_path)(struct xfrm_dst *path,
323 struct dst_entry *dst,
324 int nfheader_len);
325 int (*fill_dst)(struct xfrm_dst *xdst,
326 struct net_device *dev,
327 const struct flowi *fl);
328 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
329 };
330
331 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
332 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
333 void km_policy_notify(struct xfrm_policy *xp, int dir,
334 const struct km_event *c);
335 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
336
337 struct xfrm_tmpl;
338 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
339 struct xfrm_policy *pol);
340 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
341 int __xfrm_state_delete(struct xfrm_state *x);
342
343 struct xfrm_state_afinfo {
344 unsigned int family;
345 unsigned int proto;
346 __be16 eth_proto;
347 struct module *owner;
348 const struct xfrm_type *type_map[IPPROTO_MAX];
349 const struct xfrm_type_offload *type_offload_map[IPPROTO_MAX];
350 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
351
352 int (*init_flags)(struct xfrm_state *x);
353 void (*init_tempsel)(struct xfrm_selector *sel,
354 const struct flowi *fl);
355 void (*init_temprop)(struct xfrm_state *x,
356 const struct xfrm_tmpl *tmpl,
357 const xfrm_address_t *daddr,
358 const xfrm_address_t *saddr);
359 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
360 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
361 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
362 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
363 int (*extract_input)(struct xfrm_state *x,
364 struct sk_buff *skb);
365 int (*extract_output)(struct xfrm_state *x,
366 struct sk_buff *skb);
367 int (*transport_finish)(struct sk_buff *skb,
368 int async);
369 void (*local_error)(struct sk_buff *skb, u32 mtu);
370 };
371
372 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
373 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
374 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
375 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
376
377 struct xfrm_input_afinfo {
378 unsigned int family;
379 int (*callback)(struct sk_buff *skb, u8 protocol,
380 int err);
381 };
382
383 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
384 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
385
386 void xfrm_flush_gc(void);
387 void xfrm_state_delete_tunnel(struct xfrm_state *x);
388
389 struct xfrm_type {
390 char *description;
391 struct module *owner;
392 u8 proto;
393 u8 flags;
394 #define XFRM_TYPE_NON_FRAGMENT 1
395 #define XFRM_TYPE_REPLAY_PROT 2
396 #define XFRM_TYPE_LOCAL_COADDR 4
397 #define XFRM_TYPE_REMOTE_COADDR 8
398
399 int (*init_state)(struct xfrm_state *x);
400 void (*destructor)(struct xfrm_state *);
401 int (*input)(struct xfrm_state *, struct sk_buff *skb);
402 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
403 int (*reject)(struct xfrm_state *, struct sk_buff *,
404 const struct flowi *);
405 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
406 /* Estimate maximal size of result of transformation of a dgram */
407 u32 (*get_mtu)(struct xfrm_state *, int size);
408 };
409
410 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
411 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
412
413 struct xfrm_type_offload {
414 char *description;
415 struct module *owner;
416 u8 proto;
417 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
418 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
419 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
420 };
421
422 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
423 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
424
425 struct xfrm_mode {
426 /*
427 * Remove encapsulation header.
428 *
429 * The IP header will be moved over the top of the encapsulation
430 * header.
431 *
432 * On entry, the transport header shall point to where the IP header
433 * should be and the network header shall be set to where the IP
434 * header currently is. skb->data shall point to the start of the
435 * payload.
436 */
437 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
438
439 /*
440 * Add encapsulation header.
441 *
442 * On exit, the transport header will be set to the start of the
443 * encapsulation header to be filled in by x->type->output and
444 * the mac header will be set to the nextheader (protocol for
445 * IPv4) field of the extension header directly preceding the
446 * encapsulation header, or in its absence, that of the top IP
447 * header. The value of the network header will always point
448 * to the top IP header while skb->data will point to the payload.
449 */
450 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
451
452 struct xfrm_state_afinfo *afinfo;
453 struct module *owner;
454 u8 encap;
455 u8 family;
456 u8 flags;
457 };
458
459 /* Flags for xfrm_mode. */
460 enum {
461 XFRM_MODE_FLAG_TUNNEL = 1,
462 };
463
464 int xfrm_register_mode(struct xfrm_mode *mode);
465 void xfrm_unregister_mode(struct xfrm_mode *mode);
466
467 static inline int xfrm_af2proto(unsigned int family)
468 {
469 switch(family) {
470 case AF_INET:
471 return IPPROTO_IPIP;
472 case AF_INET6:
473 return IPPROTO_IPV6;
474 default:
475 return 0;
476 }
477 }
478
479 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
480 {
481 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
482 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
483 return x->inner_mode;
484 else
485 return x->inner_mode_iaf;
486 }
487
488 struct xfrm_tmpl {
489 /* id in template is interpreted as:
490 * daddr - destination of tunnel, may be zero for transport mode.
491 * spi - zero to acquire spi. Not zero if spi is static, then
492 * daddr must be fixed too.
493 * proto - AH/ESP/IPCOMP
494 */
495 struct xfrm_id id;
496
497 /* Source address of tunnel. Ignored, if it is not a tunnel. */
498 xfrm_address_t saddr;
499
500 unsigned short encap_family;
501
502 u32 reqid;
503
504 /* Mode: transport, tunnel etc. */
505 u8 mode;
506
507 /* Sharing mode: unique, this session only, this user only etc. */
508 u8 share;
509
510 /* May skip this transfomration if no SA is found */
511 u8 optional;
512
513 /* Skip aalgos/ealgos/calgos checks. */
514 u8 allalgs;
515
516 /* Bit mask of algos allowed for acquisition */
517 u32 aalgos;
518 u32 ealgos;
519 u32 calgos;
520 };
521
522 #define XFRM_MAX_DEPTH 6
523 #define XFRM_MAX_OFFLOAD_DEPTH 1
524
525 struct xfrm_policy_walk_entry {
526 struct list_head all;
527 u8 dead;
528 };
529
530 struct xfrm_policy_walk {
531 struct xfrm_policy_walk_entry walk;
532 u8 type;
533 u32 seq;
534 };
535
536 struct xfrm_policy_queue {
537 struct sk_buff_head hold_queue;
538 struct timer_list hold_timer;
539 unsigned long timeout;
540 };
541
542 struct xfrm_policy {
543 possible_net_t xp_net;
544 struct hlist_node bydst;
545 struct hlist_node byidx;
546
547 /* This lock only affects elements except for entry. */
548 rwlock_t lock;
549 refcount_t refcnt;
550 u32 pos;
551 struct timer_list timer;
552
553 atomic_t genid;
554 u32 priority;
555 u32 index;
556 u32 if_id;
557 struct xfrm_mark mark;
558 struct xfrm_selector selector;
559 struct xfrm_lifetime_cfg lft;
560 struct xfrm_lifetime_cur curlft;
561 struct xfrm_policy_walk_entry walk;
562 struct xfrm_policy_queue polq;
563 bool bydst_reinsert;
564 u8 type;
565 u8 action;
566 u8 flags;
567 u8 xfrm_nr;
568 u16 family;
569 struct xfrm_sec_ctx *security;
570 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
571 struct hlist_node bydst_inexact_list;
572 struct rcu_head rcu;
573 };
574
575 static inline struct net *xp_net(const struct xfrm_policy *xp)
576 {
577 return read_pnet(&xp->xp_net);
578 }
579
580 struct xfrm_kmaddress {
581 xfrm_address_t local;
582 xfrm_address_t remote;
583 u32 reserved;
584 u16 family;
585 };
586
587 struct xfrm_migrate {
588 xfrm_address_t old_daddr;
589 xfrm_address_t old_saddr;
590 xfrm_address_t new_daddr;
591 xfrm_address_t new_saddr;
592 u8 proto;
593 u8 mode;
594 u16 reserved;
595 u32 reqid;
596 u16 old_family;
597 u16 new_family;
598 };
599
600 #define XFRM_KM_TIMEOUT 30
601 /* what happened */
602 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
603 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
604
605 /* default aevent timeout in units of 100ms */
606 #define XFRM_AE_ETIME 10
607 /* Async Event timer multiplier */
608 #define XFRM_AE_ETH_M 10
609 /* default seq threshold size */
610 #define XFRM_AE_SEQT_SIZE 2
611
612 struct xfrm_mgr {
613 struct list_head list;
614 int (*notify)(struct xfrm_state *x, const struct km_event *c);
615 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
616 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
617 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
618 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
619 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
620 int (*migrate)(const struct xfrm_selector *sel,
621 u8 dir, u8 type,
622 const struct xfrm_migrate *m,
623 int num_bundles,
624 const struct xfrm_kmaddress *k,
625 const struct xfrm_encap_tmpl *encap);
626 bool (*is_alive)(const struct km_event *c);
627 };
628
629 int xfrm_register_km(struct xfrm_mgr *km);
630 int xfrm_unregister_km(struct xfrm_mgr *km);
631
632 struct xfrm_tunnel_skb_cb {
633 union {
634 struct inet_skb_parm h4;
635 struct inet6_skb_parm h6;
636 } header;
637
638 union {
639 struct ip_tunnel *ip4;
640 struct ip6_tnl *ip6;
641 } tunnel;
642 };
643
644 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
645
646 /*
647 * This structure is used for the duration where packets are being
648 * transformed by IPsec. As soon as the packet leaves IPsec the
649 * area beyond the generic IP part may be overwritten.
650 */
651 struct xfrm_skb_cb {
652 struct xfrm_tunnel_skb_cb header;
653
654 /* Sequence number for replay protection. */
655 union {
656 struct {
657 __u32 low;
658 __u32 hi;
659 } output;
660 struct {
661 __be32 low;
662 __be32 hi;
663 } input;
664 } seq;
665 };
666
667 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
668
669 /*
670 * This structure is used by the afinfo prepare_input/prepare_output functions
671 * to transmit header information to the mode input/output functions.
672 */
673 struct xfrm_mode_skb_cb {
674 struct xfrm_tunnel_skb_cb header;
675
676 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
677 __be16 id;
678 __be16 frag_off;
679
680 /* IP header length (excluding options or extension headers). */
681 u8 ihl;
682
683 /* TOS for IPv4, class for IPv6. */
684 u8 tos;
685
686 /* TTL for IPv4, hop limitfor IPv6. */
687 u8 ttl;
688
689 /* Protocol for IPv4, NH for IPv6. */
690 u8 protocol;
691
692 /* Option length for IPv4, zero for IPv6. */
693 u8 optlen;
694
695 /* Used by IPv6 only, zero for IPv4. */
696 u8 flow_lbl[3];
697 };
698
699 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
700
701 /*
702 * This structure is used by the input processing to locate the SPI and
703 * related information.
704 */
705 struct xfrm_spi_skb_cb {
706 struct xfrm_tunnel_skb_cb header;
707
708 unsigned int daddroff;
709 unsigned int family;
710 __be32 seq;
711 };
712
713 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
714
715 #ifdef CONFIG_AUDITSYSCALL
716 static inline struct audit_buffer *xfrm_audit_start(const char *op)
717 {
718 struct audit_buffer *audit_buf = NULL;
719
720 if (audit_enabled == AUDIT_OFF)
721 return NULL;
722 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
723 AUDIT_MAC_IPSEC_EVENT);
724 if (audit_buf == NULL)
725 return NULL;
726 audit_log_format(audit_buf, "op=%s", op);
727 return audit_buf;
728 }
729
730 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
731 struct audit_buffer *audit_buf)
732 {
733 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
734 audit_get_loginuid(current) :
735 INVALID_UID);
736 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
737 AUDIT_SID_UNSET;
738
739 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
740 audit_log_task_context(audit_buf);
741 }
742
743 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
744 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
745 bool task_valid);
746 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
747 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
748 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
749 struct sk_buff *skb);
750 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
751 __be32 net_seq);
752 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
753 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
754 __be32 net_seq);
755 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
756 u8 proto);
757 #else
758
759 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
760 bool task_valid)
761 {
762 }
763
764 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
765 bool task_valid)
766 {
767 }
768
769 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
770 bool task_valid)
771 {
772 }
773
774 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
775 bool task_valid)
776 {
777 }
778
779 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
780 struct sk_buff *skb)
781 {
782 }
783
784 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
785 struct sk_buff *skb, __be32 net_seq)
786 {
787 }
788
789 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
790 u16 family)
791 {
792 }
793
794 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
795 __be32 net_spi, __be32 net_seq)
796 {
797 }
798
799 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
800 struct sk_buff *skb, u8 proto)
801 {
802 }
803 #endif /* CONFIG_AUDITSYSCALL */
804
805 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
806 {
807 if (likely(policy != NULL))
808 refcount_inc(&policy->refcnt);
809 }
810
811 void xfrm_policy_destroy(struct xfrm_policy *policy);
812
813 static inline void xfrm_pol_put(struct xfrm_policy *policy)
814 {
815 if (refcount_dec_and_test(&policy->refcnt))
816 xfrm_policy_destroy(policy);
817 }
818
819 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
820 {
821 int i;
822 for (i = npols - 1; i >= 0; --i)
823 xfrm_pol_put(pols[i]);
824 }
825
826 void __xfrm_state_destroy(struct xfrm_state *, bool);
827
828 static inline void __xfrm_state_put(struct xfrm_state *x)
829 {
830 refcount_dec(&x->refcnt);
831 }
832
833 static inline void xfrm_state_put(struct xfrm_state *x)
834 {
835 if (refcount_dec_and_test(&x->refcnt))
836 __xfrm_state_destroy(x, false);
837 }
838
839 static inline void xfrm_state_put_sync(struct xfrm_state *x)
840 {
841 if (refcount_dec_and_test(&x->refcnt))
842 __xfrm_state_destroy(x, true);
843 }
844
845 static inline void xfrm_state_hold(struct xfrm_state *x)
846 {
847 refcount_inc(&x->refcnt);
848 }
849
850 static inline bool addr_match(const void *token1, const void *token2,
851 unsigned int prefixlen)
852 {
853 const __be32 *a1 = token1;
854 const __be32 *a2 = token2;
855 unsigned int pdw;
856 unsigned int pbi;
857
858 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
859 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
860
861 if (pdw)
862 if (memcmp(a1, a2, pdw << 2))
863 return false;
864
865 if (pbi) {
866 __be32 mask;
867
868 mask = htonl((0xffffffff) << (32 - pbi));
869
870 if ((a1[pdw] ^ a2[pdw]) & mask)
871 return false;
872 }
873
874 return true;
875 }
876
877 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
878 {
879 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
880 if (sizeof(long) == 4 && prefixlen == 0)
881 return true;
882 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
883 }
884
885 static __inline__
886 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
887 {
888 __be16 port;
889 switch(fl->flowi_proto) {
890 case IPPROTO_TCP:
891 case IPPROTO_UDP:
892 case IPPROTO_UDPLITE:
893 case IPPROTO_SCTP:
894 port = uli->ports.sport;
895 break;
896 case IPPROTO_ICMP:
897 case IPPROTO_ICMPV6:
898 port = htons(uli->icmpt.type);
899 break;
900 case IPPROTO_MH:
901 port = htons(uli->mht.type);
902 break;
903 case IPPROTO_GRE:
904 port = htons(ntohl(uli->gre_key) >> 16);
905 break;
906 default:
907 port = 0; /*XXX*/
908 }
909 return port;
910 }
911
912 static __inline__
913 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
914 {
915 __be16 port;
916 switch(fl->flowi_proto) {
917 case IPPROTO_TCP:
918 case IPPROTO_UDP:
919 case IPPROTO_UDPLITE:
920 case IPPROTO_SCTP:
921 port = uli->ports.dport;
922 break;
923 case IPPROTO_ICMP:
924 case IPPROTO_ICMPV6:
925 port = htons(uli->icmpt.code);
926 break;
927 case IPPROTO_GRE:
928 port = htons(ntohl(uli->gre_key) & 0xffff);
929 break;
930 default:
931 port = 0; /*XXX*/
932 }
933 return port;
934 }
935
936 bool xfrm_selector_match(const struct xfrm_selector *sel,
937 const struct flowi *fl, unsigned short family);
938
939 #ifdef CONFIG_SECURITY_NETWORK_XFRM
940 /* If neither has a context --> match
941 * Otherwise, both must have a context and the sids, doi, alg must match
942 */
943 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
944 {
945 return ((!s1 && !s2) ||
946 (s1 && s2 &&
947 (s1->ctx_sid == s2->ctx_sid) &&
948 (s1->ctx_doi == s2->ctx_doi) &&
949 (s1->ctx_alg == s2->ctx_alg)));
950 }
951 #else
952 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
953 {
954 return true;
955 }
956 #endif
957
958 /* A struct encoding bundle of transformations to apply to some set of flow.
959 *
960 * xdst->child points to the next element of bundle.
961 * dst->xfrm points to an instanse of transformer.
962 *
963 * Due to unfortunate limitations of current routing cache, which we
964 * have no time to fix, it mirrors struct rtable and bound to the same
965 * routing key, including saddr,daddr. However, we can have many of
966 * bundles differing by session id. All the bundles grow from a parent
967 * policy rule.
968 */
969 struct xfrm_dst {
970 union {
971 struct dst_entry dst;
972 struct rtable rt;
973 struct rt6_info rt6;
974 } u;
975 struct dst_entry *route;
976 struct dst_entry *child;
977 struct dst_entry *path;
978 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
979 int num_pols, num_xfrms;
980 u32 xfrm_genid;
981 u32 policy_genid;
982 u32 route_mtu_cached;
983 u32 child_mtu_cached;
984 u32 route_cookie;
985 u32 path_cookie;
986 };
987
988 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
989 {
990 #ifdef CONFIG_XFRM
991 if (dst->xfrm) {
992 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
993
994 return xdst->path;
995 }
996 #endif
997 return (struct dst_entry *) dst;
998 }
999
1000 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1001 {
1002 #ifdef CONFIG_XFRM
1003 if (dst->xfrm) {
1004 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1005 return xdst->child;
1006 }
1007 #endif
1008 return NULL;
1009 }
1010
1011 #ifdef CONFIG_XFRM
1012 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
1013 {
1014 xdst->child = child;
1015 }
1016
1017 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1018 {
1019 xfrm_pols_put(xdst->pols, xdst->num_pols);
1020 dst_release(xdst->route);
1021 if (likely(xdst->u.dst.xfrm))
1022 xfrm_state_put(xdst->u.dst.xfrm);
1023 }
1024 #endif
1025
1026 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1027
1028 struct xfrm_if_parms {
1029 char name[IFNAMSIZ]; /* name of XFRM device */
1030 int link; /* ifindex of underlying L2 interface */
1031 u32 if_id; /* interface identifyer */
1032 };
1033
1034 struct xfrm_if {
1035 struct xfrm_if __rcu *next; /* next interface in list */
1036 struct net_device *dev; /* virtual device associated with interface */
1037 struct net_device *phydev; /* physical device */
1038 struct net *net; /* netns for packet i/o */
1039 struct xfrm_if_parms p; /* interface parms */
1040
1041 struct gro_cells gro_cells;
1042 };
1043
1044 struct xfrm_offload {
1045 /* Output sequence number for replay protection on offloading. */
1046 struct {
1047 __u32 low;
1048 __u32 hi;
1049 } seq;
1050
1051 __u32 flags;
1052 #define SA_DELETE_REQ 1
1053 #define CRYPTO_DONE 2
1054 #define CRYPTO_NEXT_DONE 4
1055 #define CRYPTO_FALLBACK 8
1056 #define XFRM_GSO_SEGMENT 16
1057 #define XFRM_GRO 32
1058 #define XFRM_ESP_NO_TRAILER 64
1059 #define XFRM_DEV_RESUME 128
1060
1061 __u32 status;
1062 #define CRYPTO_SUCCESS 1
1063 #define CRYPTO_GENERIC_ERROR 2
1064 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1065 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1066 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1067 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1068 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1069 #define CRYPTO_INVALID_PROTOCOL 128
1070
1071 __u8 proto;
1072 };
1073
1074 struct sec_path {
1075 int len;
1076 int olen;
1077
1078 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1079 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1080 };
1081
1082 struct sec_path *secpath_set(struct sk_buff *skb);
1083
1084 static inline void
1085 secpath_reset(struct sk_buff *skb)
1086 {
1087 #ifdef CONFIG_XFRM
1088 skb_ext_del(skb, SKB_EXT_SEC_PATH);
1089 #endif
1090 }
1091
1092 static inline int
1093 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1094 {
1095 switch (family) {
1096 case AF_INET:
1097 return addr->a4 == 0;
1098 case AF_INET6:
1099 return ipv6_addr_any(&addr->in6);
1100 }
1101 return 0;
1102 }
1103
1104 static inline int
1105 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1106 {
1107 return (tmpl->saddr.a4 &&
1108 tmpl->saddr.a4 != x->props.saddr.a4);
1109 }
1110
1111 static inline int
1112 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1113 {
1114 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1115 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1116 }
1117
1118 static inline int
1119 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1120 {
1121 switch (family) {
1122 case AF_INET:
1123 return __xfrm4_state_addr_cmp(tmpl, x);
1124 case AF_INET6:
1125 return __xfrm6_state_addr_cmp(tmpl, x);
1126 }
1127 return !0;
1128 }
1129
1130 #ifdef CONFIG_XFRM
1131 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1132 unsigned short family);
1133
1134 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1135 struct sk_buff *skb,
1136 unsigned int family, int reverse)
1137 {
1138 struct net *net = dev_net(skb->dev);
1139 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1140
1141 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1142 return __xfrm_policy_check(sk, ndir, skb, family);
1143
1144 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1145 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1146 __xfrm_policy_check(sk, ndir, skb, family);
1147 }
1148
1149 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1150 {
1151 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1152 }
1153
1154 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1155 {
1156 return xfrm_policy_check(sk, dir, skb, AF_INET);
1157 }
1158
1159 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1160 {
1161 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1162 }
1163
1164 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1165 struct sk_buff *skb)
1166 {
1167 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1168 }
1169
1170 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1171 struct sk_buff *skb)
1172 {
1173 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1174 }
1175
1176 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1177 unsigned int family, int reverse);
1178
1179 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1180 unsigned int family)
1181 {
1182 return __xfrm_decode_session(skb, fl, family, 0);
1183 }
1184
1185 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1186 struct flowi *fl,
1187 unsigned int family)
1188 {
1189 return __xfrm_decode_session(skb, fl, family, 1);
1190 }
1191
1192 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1193
1194 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1195 {
1196 struct net *net = dev_net(skb->dev);
1197
1198 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1199 (skb_dst(skb)->flags & DST_NOXFRM) ||
1200 __xfrm_route_forward(skb, family);
1201 }
1202
1203 static inline int xfrm4_route_forward(struct sk_buff *skb)
1204 {
1205 return xfrm_route_forward(skb, AF_INET);
1206 }
1207
1208 static inline int xfrm6_route_forward(struct sk_buff *skb)
1209 {
1210 return xfrm_route_forward(skb, AF_INET6);
1211 }
1212
1213 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1214
1215 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1216 {
1217 sk->sk_policy[0] = NULL;
1218 sk->sk_policy[1] = NULL;
1219 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1220 return __xfrm_sk_clone_policy(sk, osk);
1221 return 0;
1222 }
1223
1224 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1225
1226 static inline void xfrm_sk_free_policy(struct sock *sk)
1227 {
1228 struct xfrm_policy *pol;
1229
1230 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1231 if (unlikely(pol != NULL)) {
1232 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1233 sk->sk_policy[0] = NULL;
1234 }
1235 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1236 if (unlikely(pol != NULL)) {
1237 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1238 sk->sk_policy[1] = NULL;
1239 }
1240 }
1241
1242 #else
1243
1244 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1245 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1246 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1247 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1248 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1249 {
1250 return 1;
1251 }
1252 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1253 {
1254 return 1;
1255 }
1256 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1257 {
1258 return 1;
1259 }
1260 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1261 struct flowi *fl,
1262 unsigned int family)
1263 {
1264 return -ENOSYS;
1265 }
1266 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1267 struct sk_buff *skb)
1268 {
1269 return 1;
1270 }
1271 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1272 struct sk_buff *skb)
1273 {
1274 return 1;
1275 }
1276 #endif
1277
1278 static __inline__
1279 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1280 {
1281 switch (family){
1282 case AF_INET:
1283 return (xfrm_address_t *)&fl->u.ip4.daddr;
1284 case AF_INET6:
1285 return (xfrm_address_t *)&fl->u.ip6.daddr;
1286 }
1287 return NULL;
1288 }
1289
1290 static __inline__
1291 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1292 {
1293 switch (family){
1294 case AF_INET:
1295 return (xfrm_address_t *)&fl->u.ip4.saddr;
1296 case AF_INET6:
1297 return (xfrm_address_t *)&fl->u.ip6.saddr;
1298 }
1299 return NULL;
1300 }
1301
1302 static __inline__
1303 void xfrm_flowi_addr_get(const struct flowi *fl,
1304 xfrm_address_t *saddr, xfrm_address_t *daddr,
1305 unsigned short family)
1306 {
1307 switch(family) {
1308 case AF_INET:
1309 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1310 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1311 break;
1312 case AF_INET6:
1313 saddr->in6 = fl->u.ip6.saddr;
1314 daddr->in6 = fl->u.ip6.daddr;
1315 break;
1316 }
1317 }
1318
1319 static __inline__ int
1320 __xfrm4_state_addr_check(const struct xfrm_state *x,
1321 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1322 {
1323 if (daddr->a4 == x->id.daddr.a4 &&
1324 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1325 return 1;
1326 return 0;
1327 }
1328
1329 static __inline__ int
1330 __xfrm6_state_addr_check(const struct xfrm_state *x,
1331 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1332 {
1333 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1334 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1335 ipv6_addr_any((struct in6_addr *)saddr) ||
1336 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1337 return 1;
1338 return 0;
1339 }
1340
1341 static __inline__ int
1342 xfrm_state_addr_check(const struct xfrm_state *x,
1343 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1344 unsigned short family)
1345 {
1346 switch (family) {
1347 case AF_INET:
1348 return __xfrm4_state_addr_check(x, daddr, saddr);
1349 case AF_INET6:
1350 return __xfrm6_state_addr_check(x, daddr, saddr);
1351 }
1352 return 0;
1353 }
1354
1355 static __inline__ int
1356 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1357 unsigned short family)
1358 {
1359 switch (family) {
1360 case AF_INET:
1361 return __xfrm4_state_addr_check(x,
1362 (const xfrm_address_t *)&fl->u.ip4.daddr,
1363 (const xfrm_address_t *)&fl->u.ip4.saddr);
1364 case AF_INET6:
1365 return __xfrm6_state_addr_check(x,
1366 (const xfrm_address_t *)&fl->u.ip6.daddr,
1367 (const xfrm_address_t *)&fl->u.ip6.saddr);
1368 }
1369 return 0;
1370 }
1371
1372 static inline int xfrm_state_kern(const struct xfrm_state *x)
1373 {
1374 return atomic_read(&x->tunnel_users);
1375 }
1376
1377 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1378 {
1379 return (!userproto || proto == userproto ||
1380 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1381 proto == IPPROTO_ESP ||
1382 proto == IPPROTO_COMP)));
1383 }
1384
1385 /*
1386 * xfrm algorithm information
1387 */
1388 struct xfrm_algo_aead_info {
1389 char *geniv;
1390 u16 icv_truncbits;
1391 };
1392
1393 struct xfrm_algo_auth_info {
1394 u16 icv_truncbits;
1395 u16 icv_fullbits;
1396 };
1397
1398 struct xfrm_algo_encr_info {
1399 char *geniv;
1400 u16 blockbits;
1401 u16 defkeybits;
1402 };
1403
1404 struct xfrm_algo_comp_info {
1405 u16 threshold;
1406 };
1407
1408 struct xfrm_algo_desc {
1409 char *name;
1410 char *compat;
1411 u8 available:1;
1412 u8 pfkey_supported:1;
1413 union {
1414 struct xfrm_algo_aead_info aead;
1415 struct xfrm_algo_auth_info auth;
1416 struct xfrm_algo_encr_info encr;
1417 struct xfrm_algo_comp_info comp;
1418 } uinfo;
1419 struct sadb_alg desc;
1420 };
1421
1422 /* XFRM protocol handlers. */
1423 struct xfrm4_protocol {
1424 int (*handler)(struct sk_buff *skb);
1425 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1426 int encap_type);
1427 int (*cb_handler)(struct sk_buff *skb, int err);
1428 int (*err_handler)(struct sk_buff *skb, u32 info);
1429
1430 struct xfrm4_protocol __rcu *next;
1431 int priority;
1432 };
1433
1434 struct xfrm6_protocol {
1435 int (*handler)(struct sk_buff *skb);
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 (*err_handler)(struct sk_buff *skb, u32 info);
1448
1449 struct xfrm_tunnel __rcu *next;
1450 int priority;
1451 };
1452
1453 struct xfrm6_tunnel {
1454 int (*handler)(struct sk_buff *skb);
1455 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1456 u8 type, u8 code, int offset, __be32 info);
1457 struct xfrm6_tunnel __rcu *next;
1458 int priority;
1459 };
1460
1461 void xfrm_init(void);
1462 void xfrm4_init(void);
1463 int xfrm_state_init(struct net *net);
1464 void xfrm_state_fini(struct net *net);
1465 void xfrm4_state_init(void);
1466 void xfrm4_protocol_init(void);
1467 #ifdef CONFIG_XFRM
1468 int xfrm6_init(void);
1469 void xfrm6_fini(void);
1470 int xfrm6_state_init(void);
1471 void xfrm6_state_fini(void);
1472 int xfrm6_protocol_init(void);
1473 void xfrm6_protocol_fini(void);
1474 #else
1475 static inline int xfrm6_init(void)
1476 {
1477 return 0;
1478 }
1479 static inline void xfrm6_fini(void)
1480 {
1481 ;
1482 }
1483 #endif
1484
1485 #ifdef CONFIG_XFRM_STATISTICS
1486 int xfrm_proc_init(struct net *net);
1487 void xfrm_proc_fini(struct net *net);
1488 #endif
1489
1490 int xfrm_sysctl_init(struct net *net);
1491 #ifdef CONFIG_SYSCTL
1492 void xfrm_sysctl_fini(struct net *net);
1493 #else
1494 static inline void xfrm_sysctl_fini(struct net *net)
1495 {
1496 }
1497 #endif
1498
1499 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1500 struct xfrm_address_filter *filter);
1501 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1502 int (*func)(struct xfrm_state *, int, void*), void *);
1503 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1504 struct xfrm_state *xfrm_state_alloc(struct net *net);
1505 void xfrm_state_free(struct xfrm_state *x);
1506 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1507 const xfrm_address_t *saddr,
1508 const struct flowi *fl,
1509 struct xfrm_tmpl *tmpl,
1510 struct xfrm_policy *pol, int *err,
1511 unsigned short family, u32 if_id);
1512 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1513 xfrm_address_t *daddr,
1514 xfrm_address_t *saddr,
1515 unsigned short family,
1516 u8 mode, u8 proto, u32 reqid);
1517 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1518 unsigned short family);
1519 int xfrm_state_check_expire(struct xfrm_state *x);
1520 void xfrm_state_insert(struct xfrm_state *x);
1521 int xfrm_state_add(struct xfrm_state *x);
1522 int xfrm_state_update(struct xfrm_state *x);
1523 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1524 const xfrm_address_t *daddr, __be32 spi,
1525 u8 proto, unsigned short family);
1526 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1527 const xfrm_address_t *daddr,
1528 const xfrm_address_t *saddr,
1529 u8 proto,
1530 unsigned short family);
1531 #ifdef CONFIG_XFRM_SUB_POLICY
1532 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1533 unsigned short family, struct net *net);
1534 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1535 unsigned short family);
1536 #else
1537 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1538 int n, unsigned short family, struct net *net)
1539 {
1540 return -ENOSYS;
1541 }
1542
1543 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1544 int n, unsigned short family)
1545 {
1546 return -ENOSYS;
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 int 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(struct sk_buff *skb,
1581 int (*finish)(struct net *, struct sock *,
1582 struct sk_buff *));
1583 int xfrm_output_resume(struct sk_buff *skb, int err);
1584 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1585
1586 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1587 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1588 #endif
1589
1590 void xfrm_local_error(struct sk_buff *skb, int mtu);
1591 int xfrm4_extract_header(struct sk_buff *skb);
1592 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1593 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1594 int encap_type);
1595 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1596 int xfrm4_rcv(struct sk_buff *skb);
1597 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1598
1599 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1600 {
1601 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1602 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1603 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1604 return xfrm_input(skb, nexthdr, spi, 0);
1605 }
1606
1607 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1608 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1609 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1610 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1611 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1612 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1613 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1614 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1615 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1616 int xfrm6_extract_header(struct sk_buff *skb);
1617 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1618 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1619 struct ip6_tnl *t);
1620 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1621 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1622 int xfrm6_rcv(struct sk_buff *skb);
1623 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1624 xfrm_address_t *saddr, u8 proto);
1625 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1626 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1627 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1628 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1629 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1630 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1631 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1632 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1633 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1634 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1635 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1636 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1637 u8 **prevhdr);
1638
1639 #ifdef CONFIG_XFRM
1640 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1641 int xfrm_user_policy(struct sock *sk, int optname,
1642 u8 __user *optval, int optlen);
1643 #else
1644 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1645 {
1646 return -ENOPROTOOPT;
1647 }
1648
1649 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1650 {
1651 /* should not happen */
1652 kfree_skb(skb);
1653 return 0;
1654 }
1655 #endif
1656
1657 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1658 const xfrm_address_t *saddr,
1659 const xfrm_address_t *daddr,
1660 int family, u32 mark);
1661
1662 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1663
1664 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1665 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1666 int (*func)(struct xfrm_policy *, int, int, void*),
1667 void *);
1668 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1669 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1670 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id,
1671 u8 type, int dir,
1672 struct xfrm_selector *sel,
1673 struct xfrm_sec_ctx *ctx, int delete,
1674 int *err);
1675 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8,
1676 int dir, u32 id, int delete, int *err);
1677 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1678 void xfrm_policy_hash_rebuild(struct net *net);
1679 u32 xfrm_get_acqseq(void);
1680 int verify_spi_info(u8 proto, u32 min, u32 max);
1681 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1682 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1683 u8 mode, u32 reqid, u32 if_id, u8 proto,
1684 const xfrm_address_t *daddr,
1685 const xfrm_address_t *saddr, int create,
1686 unsigned short family);
1687 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1688
1689 #ifdef CONFIG_XFRM_MIGRATE
1690 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1691 const struct xfrm_migrate *m, int num_bundles,
1692 const struct xfrm_kmaddress *k,
1693 const struct xfrm_encap_tmpl *encap);
1694 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1695 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1696 struct xfrm_migrate *m,
1697 struct xfrm_encap_tmpl *encap);
1698 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1699 struct xfrm_migrate *m, int num_bundles,
1700 struct xfrm_kmaddress *k, struct net *net,
1701 struct xfrm_encap_tmpl *encap);
1702 #endif
1703
1704 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1705 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1706 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1707 xfrm_address_t *addr);
1708
1709 void xfrm_input_init(void);
1710 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1711
1712 void xfrm_probe_algs(void);
1713 int xfrm_count_pfkey_auth_supported(void);
1714 int xfrm_count_pfkey_enc_supported(void);
1715 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1716 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1717 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1718 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1719 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1720 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1721 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1722 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1723 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1724 int probe);
1725
1726 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1727 const xfrm_address_t *b)
1728 {
1729 return ipv6_addr_equal((const struct in6_addr *)a,
1730 (const struct in6_addr *)b);
1731 }
1732
1733 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1734 const xfrm_address_t *b,
1735 sa_family_t family)
1736 {
1737 switch (family) {
1738 default:
1739 case AF_INET:
1740 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1741 case AF_INET6:
1742 return xfrm6_addr_equal(a, b);
1743 }
1744 }
1745
1746 static inline int xfrm_policy_id2dir(u32 index)
1747 {
1748 return index & 7;
1749 }
1750
1751 #ifdef CONFIG_XFRM
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
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
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
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
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
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
1801 static inline int xfrm_replay_clone(struct xfrm_state *x,
1802 struct xfrm_state *orig)
1803 {
1804 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1805 GFP_KERNEL);
1806 if (!x->replay_esn)
1807 return -ENOMEM;
1808
1809 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1810 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1811
1812 x->preplay_esn = kmemdup(x->replay_esn,
1813 xfrm_replay_state_esn_len(x->replay_esn),
1814 GFP_KERNEL);
1815 if (!x->preplay_esn) {
1816 kfree(x->replay_esn);
1817 return -ENOMEM;
1818 }
1819
1820 return 0;
1821 }
1822
1823 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1824 {
1825 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1826 }
1827
1828
1829 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1830 {
1831 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1832 }
1833
1834 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1835 {
1836 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1837 }
1838
1839 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1840 {
1841 int i;
1842 for (i = 0; i < n; i++)
1843 xfrm_state_put(*(states + i));
1844 }
1845
1846 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1847 {
1848 int i;
1849 for (i = 0; i < n; i++)
1850 xfrm_state_delete(*(states + i));
1851 }
1852 #endif
1853
1854 #ifdef CONFIG_XFRM
1855 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1856 {
1857 struct sec_path *sp = skb_sec_path(skb);
1858
1859 return sp->xvec[sp->len - 1];
1860 }
1861 #endif
1862
1863 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1864 {
1865 #ifdef CONFIG_XFRM
1866 struct sec_path *sp = skb_sec_path(skb);
1867
1868 if (!sp || !sp->olen || sp->len != sp->olen)
1869 return NULL;
1870
1871 return &sp->ovec[sp->olen - 1];
1872 #else
1873 return NULL;
1874 #endif
1875 }
1876
1877 void __init xfrm_dev_init(void);
1878
1879 #ifdef CONFIG_XFRM_OFFLOAD
1880 void xfrm_dev_resume(struct sk_buff *skb);
1881 void xfrm_dev_backlog(struct softnet_data *sd);
1882 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1883 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1884 struct xfrm_user_offload *xuo);
1885 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1886
1887 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1888 {
1889 struct xfrm_state_offload *xso = &x->xso;
1890
1891 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1892 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1893 }
1894
1895 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1896 {
1897 struct xfrm_state *x = dst->xfrm;
1898 struct xfrm_dst *xdst;
1899
1900 if (!x || !x->type_offload)
1901 return false;
1902
1903 xdst = (struct xfrm_dst *) dst;
1904 if (!x->xso.offload_handle && !xdst->child->xfrm)
1905 return true;
1906 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1907 !xdst->child->xfrm)
1908 return true;
1909
1910 return false;
1911 }
1912
1913 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1914 {
1915 struct xfrm_state_offload *xso = &x->xso;
1916
1917 if (xso->dev)
1918 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1919 }
1920
1921 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1922 {
1923 struct xfrm_state_offload *xso = &x->xso;
1924 struct net_device *dev = xso->dev;
1925
1926 if (dev && dev->xfrmdev_ops) {
1927 if (dev->xfrmdev_ops->xdo_dev_state_free)
1928 dev->xfrmdev_ops->xdo_dev_state_free(x);
1929 xso->dev = NULL;
1930 dev_put(dev);
1931 }
1932 }
1933 #else
1934 static inline void xfrm_dev_resume(struct sk_buff *skb)
1935 {
1936 }
1937
1938 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1939 {
1940 }
1941
1942 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1943 {
1944 return skb;
1945 }
1946
1947 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1948 {
1949 return 0;
1950 }
1951
1952 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1953 {
1954 }
1955
1956 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1957 {
1958 }
1959
1960 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1961 {
1962 return false;
1963 }
1964
1965 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1966 {
1967 }
1968
1969 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1970 {
1971 return false;
1972 }
1973 #endif
1974
1975 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1976 {
1977 if (attrs[XFRMA_MARK])
1978 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1979 else
1980 m->v = m->m = 0;
1981
1982 return m->v & m->m;
1983 }
1984
1985 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1986 {
1987 int ret = 0;
1988
1989 if (m->m | m->v)
1990 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1991 return ret;
1992 }
1993
1994 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1995 {
1996 struct xfrm_mark *m = &x->props.smark;
1997
1998 return (m->v & m->m) | (mark & ~m->m);
1999 }
2000
2001 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
2002 {
2003 int ret = 0;
2004
2005 if (if_id)
2006 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
2007 return ret;
2008 }
2009
2010 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2011 unsigned int family)
2012 {
2013 bool tunnel = false;
2014
2015 switch(family) {
2016 case AF_INET:
2017 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2018 tunnel = true;
2019 break;
2020 case AF_INET6:
2021 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2022 tunnel = true;
2023 break;
2024 }
2025 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2026 return -EINVAL;
2027
2028 return 0;
2029 }
2030 #endif /* _NET_XFRM_H */
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