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usb: xhci: tegra: Add runtime PM support
[linux-2.6/btrfs-unstable.git] / include / net / xfrm.h
blob45e75c36b738bf647584db536c22eddd6dd439cc
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
27 #include <linux/interrupt.h>
28
29 #ifdef CONFIG_XFRM_STATISTICS
30 #include <net/snmp.h>
31 #endif
32
33 #define XFRM_PROTO_ESP 50
34 #define XFRM_PROTO_AH 51
35 #define XFRM_PROTO_COMP 108
36 #define XFRM_PROTO_IPIP 4
37 #define XFRM_PROTO_IPV6 41
38 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
39 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
40
41 #define XFRM_ALIGN4(len) (((len) + 3) & ~3)
42 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
43 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
44 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
45 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
46 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
47 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
48 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
49
50 #ifdef CONFIG_XFRM_STATISTICS
51 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
52 #else
53 #define XFRM_INC_STATS(net, field) ((void)(net))
54 #endif
55
56
57 /* Organization of SPD aka "XFRM rules"
58 ------------------------------------
59
60 Basic objects:
61 - policy rule, struct xfrm_policy (=SPD entry)
62 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
63 - instance of a transformer, struct xfrm_state (=SA)
64 - template to clone xfrm_state, struct xfrm_tmpl
65
66 SPD is plain linear list of xfrm_policy rules, ordered by priority.
67 (To be compatible with existing pfkeyv2 implementations,
68 many rules with priority of 0x7fffffff are allowed to exist and
69 such rules are ordered in an unpredictable way, thanks to bsd folks.)
70
71 Lookup is plain linear search until the first match with selector.
72
73 If "action" is "block", then we prohibit the flow, otherwise:
74 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
75 policy entry has list of up to XFRM_MAX_DEPTH transformations,
76 described by templates xfrm_tmpl. Each template is resolved
77 to a complete xfrm_state (see below) and we pack bundle of transformations
78 to a dst_entry returned to requestor.
79
80 dst -. xfrm .-> xfrm_state #1
81 |---. child .-> dst -. xfrm .-> xfrm_state #2
82 |---. child .-> dst -. xfrm .-> xfrm_state #3
83 |---. child .-> NULL
84
85 Bundles are cached at xrfm_policy struct (field ->bundles).
86
87
88 Resolution of xrfm_tmpl
89 -----------------------
90 Template contains:
91 1. ->mode Mode: transport or tunnel
92 2. ->id.proto Protocol: AH/ESP/IPCOMP
93 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
94 Q: allow to resolve security gateway?
95 4. ->id.spi If not zero, static SPI.
96 5. ->saddr Local tunnel endpoint, ignored for transport mode.
97 6. ->algos List of allowed algos. Plain bitmask now.
98 Q: ealgos, aalgos, calgos. What a mess...
99 7. ->share Sharing mode.
100 Q: how to implement private sharing mode? To add struct sock* to
101 flow id?
102
103 Having this template we search through SAD searching for entries
104 with appropriate mode/proto/algo, permitted by selector.
105 If no appropriate entry found, it is requested from key manager.
106
107 PROBLEMS:
108 Q: How to find all the bundles referring to a physical path for
109 PMTU discovery? Seems, dst should contain list of all parents...
110 and enter to infinite locking hierarchy disaster.
111 No! It is easier, we will not search for them, let them find us.
112 We add genid to each dst plus pointer to genid of raw IP route,
113 pmtu disc will update pmtu on raw IP route and increase its genid.
114 dst_check() will see this for top level and trigger resyncing
115 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
116 */
117
118 struct xfrm_state_walk {
119 struct list_head all;
120 u8 state;
121 u8 dying;
122 u8 proto;
123 u32 seq;
124 struct xfrm_address_filter *filter;
125 };
126
127 struct xfrm_state_offload {
128 struct net_device *dev;
129 unsigned long offload_handle;
130 unsigned int num_exthdrs;
131 u8 flags;
132 };
133
134 /* Full description of state of transformer. */
135 struct xfrm_state {
136 possible_net_t xs_net;
137 union {
138 struct hlist_node gclist;
139 struct hlist_node bydst;
140 };
141 struct hlist_node bysrc;
142 struct hlist_node byspi;
143
144 refcount_t refcnt;
145 spinlock_t lock;
146
147 struct xfrm_id id;
148 struct xfrm_selector sel;
149 struct xfrm_mark mark;
150 u32 tfcpad;
151
152 u32 genid;
153
154 /* Key manager bits */
155 struct xfrm_state_walk km;
156
157 /* Parameters of this state. */
158 struct {
159 u32 reqid;
160 u8 mode;
161 u8 replay_window;
162 u8 aalgo, ealgo, calgo;
163 u8 flags;
164 u16 family;
165 xfrm_address_t saddr;
166 int header_len;
167 int trailer_len;
168 u32 extra_flags;
169 u32 output_mark;
170 } props;
171
172 struct xfrm_lifetime_cfg lft;
173
174 /* Data for transformer */
175 struct xfrm_algo_auth *aalg;
176 struct xfrm_algo *ealg;
177 struct xfrm_algo *calg;
178 struct xfrm_algo_aead *aead;
179 const char *geniv;
180
181 /* Data for encapsulator */
182 struct xfrm_encap_tmpl *encap;
183
184 /* Data for care-of address */
185 xfrm_address_t *coaddr;
186
187 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
188 struct xfrm_state *tunnel;
189
190 /* If a tunnel, number of users + 1 */
191 atomic_t tunnel_users;
192
193 /* State for replay detection */
194 struct xfrm_replay_state replay;
195 struct xfrm_replay_state_esn *replay_esn;
196
197 /* Replay detection state at the time we sent the last notification */
198 struct xfrm_replay_state preplay;
199 struct xfrm_replay_state_esn *preplay_esn;
200
201 /* The functions for replay detection. */
202 const struct xfrm_replay *repl;
203
204 /* internal flag that only holds state for delayed aevent at the
205 * moment
206 */
207 u32 xflags;
208
209 /* Replay detection notification settings */
210 u32 replay_maxage;
211 u32 replay_maxdiff;
212
213 /* Replay detection notification timer */
214 struct timer_list rtimer;
215
216 /* Statistics */
217 struct xfrm_stats stats;
218
219 struct xfrm_lifetime_cur curlft;
220 struct tasklet_hrtimer mtimer;
221
222 struct xfrm_state_offload xso;
223
224 /* used to fix curlft->add_time when changing date */
225 long saved_tmo;
226
227 /* Last used time */
228 unsigned long lastused;
229
230 struct page_frag xfrag;
231
232 /* Reference to data common to all the instances of this
233 * transformer. */
234 const struct xfrm_type *type;
235 struct xfrm_mode *inner_mode;
236 struct xfrm_mode *inner_mode_iaf;
237 struct xfrm_mode *outer_mode;
238
239 const struct xfrm_type_offload *type_offload;
240
241 /* Security context */
242 struct xfrm_sec_ctx *security;
243
244 /* Private data of this transformer, format is opaque,
245 * interpreted by xfrm_type methods. */
246 void *data;
247 };
248
249 static inline struct net *xs_net(struct xfrm_state *x)
250 {
251 return read_pnet(&x->xs_net);
252 }
253
254 /* xflags - make enum if more show up */
255 #define XFRM_TIME_DEFER 1
256 #define XFRM_SOFT_EXPIRE 2
257
258 enum {
259 XFRM_STATE_VOID,
260 XFRM_STATE_ACQ,
261 XFRM_STATE_VALID,
262 XFRM_STATE_ERROR,
263 XFRM_STATE_EXPIRED,
264 XFRM_STATE_DEAD
265 };
266
267 /* callback structure passed from either netlink or pfkey */
268 struct km_event {
269 union {
270 u32 hard;
271 u32 proto;
272 u32 byid;
273 u32 aevent;
274 u32 type;
275 } data;
276
277 u32 seq;
278 u32 portid;
279 u32 event;
280 struct net *net;
281 };
282
283 struct xfrm_replay {
284 void (*advance)(struct xfrm_state *x, __be32 net_seq);
285 int (*check)(struct xfrm_state *x,
286 struct sk_buff *skb,
287 __be32 net_seq);
288 int (*recheck)(struct xfrm_state *x,
289 struct sk_buff *skb,
290 __be32 net_seq);
291 void (*notify)(struct xfrm_state *x, int event);
292 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
293 };
294
295 struct net_device;
296 struct xfrm_type;
297 struct xfrm_dst;
298 struct xfrm_policy_afinfo {
299 struct dst_ops *dst_ops;
300 struct dst_entry *(*dst_lookup)(struct net *net,
301 int tos, int oif,
302 const xfrm_address_t *saddr,
303 const xfrm_address_t *daddr,
304 u32 mark);
305 int (*get_saddr)(struct net *net, int oif,
306 xfrm_address_t *saddr,
307 xfrm_address_t *daddr,
308 u32 mark);
309 void (*decode_session)(struct sk_buff *skb,
310 struct flowi *fl,
311 int reverse);
312 int (*get_tos)(const struct flowi *fl);
313 int (*init_path)(struct xfrm_dst *path,
314 struct dst_entry *dst,
315 int nfheader_len);
316 int (*fill_dst)(struct xfrm_dst *xdst,
317 struct net_device *dev,
318 const struct flowi *fl);
319 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
320 };
321
322 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
323 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
324 void km_policy_notify(struct xfrm_policy *xp, int dir,
325 const struct km_event *c);
326 void xfrm_policy_cache_flush(void);
327 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
328
329 struct xfrm_tmpl;
330 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
331 struct xfrm_policy *pol);
332 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
333 int __xfrm_state_delete(struct xfrm_state *x);
334
335 struct xfrm_state_afinfo {
336 unsigned int family;
337 unsigned int proto;
338 __be16 eth_proto;
339 struct module *owner;
340 const struct xfrm_type *type_map[IPPROTO_MAX];
341 const struct xfrm_type_offload *type_offload_map[IPPROTO_MAX];
342 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
343
344 int (*init_flags)(struct xfrm_state *x);
345 void (*init_tempsel)(struct xfrm_selector *sel,
346 const struct flowi *fl);
347 void (*init_temprop)(struct xfrm_state *x,
348 const struct xfrm_tmpl *tmpl,
349 const xfrm_address_t *daddr,
350 const xfrm_address_t *saddr);
351 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
352 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
353 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
354 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
355 int (*extract_input)(struct xfrm_state *x,
356 struct sk_buff *skb);
357 int (*extract_output)(struct xfrm_state *x,
358 struct sk_buff *skb);
359 int (*transport_finish)(struct sk_buff *skb,
360 int async);
361 void (*local_error)(struct sk_buff *skb, u32 mtu);
362 };
363
364 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
365 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
366 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
367 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
368
369 struct xfrm_input_afinfo {
370 unsigned int family;
371 int (*callback)(struct sk_buff *skb, u8 protocol,
372 int err);
373 };
374
375 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
376 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
377
378 void xfrm_flush_gc(void);
379 void xfrm_state_delete_tunnel(struct xfrm_state *x);
380
381 struct xfrm_type {
382 char *description;
383 struct module *owner;
384 u8 proto;
385 u8 flags;
386 #define XFRM_TYPE_NON_FRAGMENT 1
387 #define XFRM_TYPE_REPLAY_PROT 2
388 #define XFRM_TYPE_LOCAL_COADDR 4
389 #define XFRM_TYPE_REMOTE_COADDR 8
390
391 int (*init_state)(struct xfrm_state *x);
392 void (*destructor)(struct xfrm_state *);
393 int (*input)(struct xfrm_state *, struct sk_buff *skb);
394 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
395 int (*reject)(struct xfrm_state *, struct sk_buff *,
396 const struct flowi *);
397 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
398 /* Estimate maximal size of result of transformation of a dgram */
399 u32 (*get_mtu)(struct xfrm_state *, int size);
400 };
401
402 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
403 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
404
405 struct xfrm_type_offload {
406 char *description;
407 struct module *owner;
408 u8 proto;
409 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
410 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
411 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
412 };
413
414 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
415 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
416
417 struct xfrm_mode {
418 /*
419 * Remove encapsulation header.
420 *
421 * The IP header will be moved over the top of the encapsulation
422 * header.
423 *
424 * On entry, the transport header shall point to where the IP header
425 * should be and the network header shall be set to where the IP
426 * header currently is. skb->data shall point to the start of the
427 * payload.
428 */
429 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
430
431 /*
432 * This is the actual input entry point.
433 *
434 * For transport mode and equivalent this would be identical to
435 * input2 (which does not need to be set). While tunnel mode
436 * and equivalent would set this to the tunnel encapsulation function
437 * xfrm4_prepare_input that would in turn call input2.
438 */
439 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
440
441 /*
442 * Add encapsulation header.
443 *
444 * On exit, the transport header will be set to the start of the
445 * encapsulation header to be filled in by x->type->output and
446 * the mac header will be set to the nextheader (protocol for
447 * IPv4) field of the extension header directly preceding the
448 * encapsulation header, or in its absence, that of the top IP
449 * header. The value of the network header will always point
450 * to the top IP header while skb->data will point to the payload.
451 */
452 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
453
454 /*
455 * This is the actual output entry point.
456 *
457 * For transport mode and equivalent this would be identical to
458 * output2 (which does not need to be set). While tunnel mode
459 * and equivalent would set this to a tunnel encapsulation function
460 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
461 * call output2.
462 */
463 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
464
465 /*
466 * Adjust pointers into the packet and do GSO segmentation.
467 */
468 struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);
469
470 /*
471 * Adjust pointers into the packet when IPsec is done at layer2.
472 */
473 void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);
474
475 struct xfrm_state_afinfo *afinfo;
476 struct module *owner;
477 unsigned int encap;
478 int flags;
479 };
480
481 /* Flags for xfrm_mode. */
482 enum {
483 XFRM_MODE_FLAG_TUNNEL = 1,
484 };
485
486 int xfrm_register_mode(struct xfrm_mode *mode, int family);
487 int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
488
489 static inline int xfrm_af2proto(unsigned int family)
490 {
491 switch(family) {
492 case AF_INET:
493 return IPPROTO_IPIP;
494 case AF_INET6:
495 return IPPROTO_IPV6;
496 default:
497 return 0;
498 }
499 }
500
501 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
502 {
503 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
504 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
505 return x->inner_mode;
506 else
507 return x->inner_mode_iaf;
508 }
509
510 struct xfrm_tmpl {
511 /* id in template is interpreted as:
512 * daddr - destination of tunnel, may be zero for transport mode.
513 * spi - zero to acquire spi. Not zero if spi is static, then
514 * daddr must be fixed too.
515 * proto - AH/ESP/IPCOMP
516 */
517 struct xfrm_id id;
518
519 /* Source address of tunnel. Ignored, if it is not a tunnel. */
520 xfrm_address_t saddr;
521
522 unsigned short encap_family;
523
524 u32 reqid;
525
526 /* Mode: transport, tunnel etc. */
527 u8 mode;
528
529 /* Sharing mode: unique, this session only, this user only etc. */
530 u8 share;
531
532 /* May skip this transfomration if no SA is found */
533 u8 optional;
534
535 /* Skip aalgos/ealgos/calgos checks. */
536 u8 allalgs;
537
538 /* Bit mask of algos allowed for acquisition */
539 u32 aalgos;
540 u32 ealgos;
541 u32 calgos;
542 };
543
544 #define XFRM_MAX_DEPTH 6
545 #define XFRM_MAX_OFFLOAD_DEPTH 1
546
547 struct xfrm_policy_walk_entry {
548 struct list_head all;
549 u8 dead;
550 };
551
552 struct xfrm_policy_walk {
553 struct xfrm_policy_walk_entry walk;
554 u8 type;
555 u32 seq;
556 };
557
558 struct xfrm_policy_queue {
559 struct sk_buff_head hold_queue;
560 struct timer_list hold_timer;
561 unsigned long timeout;
562 };
563
564 struct xfrm_policy {
565 possible_net_t xp_net;
566 struct hlist_node bydst;
567 struct hlist_node byidx;
568
569 /* This lock only affects elements except for entry. */
570 rwlock_t lock;
571 refcount_t refcnt;
572 struct timer_list timer;
573
574 atomic_t genid;
575 u32 priority;
576 u32 index;
577 struct xfrm_mark mark;
578 struct xfrm_selector selector;
579 struct xfrm_lifetime_cfg lft;
580 struct xfrm_lifetime_cur curlft;
581 struct xfrm_policy_walk_entry walk;
582 struct xfrm_policy_queue polq;
583 u8 type;
584 u8 action;
585 u8 flags;
586 u8 xfrm_nr;
587 u16 family;
588 struct xfrm_sec_ctx *security;
589 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
590 struct rcu_head rcu;
591 };
592
593 static inline struct net *xp_net(const struct xfrm_policy *xp)
594 {
595 return read_pnet(&xp->xp_net);
596 }
597
598 struct xfrm_kmaddress {
599 xfrm_address_t local;
600 xfrm_address_t remote;
601 u32 reserved;
602 u16 family;
603 };
604
605 struct xfrm_migrate {
606 xfrm_address_t old_daddr;
607 xfrm_address_t old_saddr;
608 xfrm_address_t new_daddr;
609 xfrm_address_t new_saddr;
610 u8 proto;
611 u8 mode;
612 u16 reserved;
613 u32 reqid;
614 u16 old_family;
615 u16 new_family;
616 };
617
618 #define XFRM_KM_TIMEOUT 30
619 /* what happened */
620 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
621 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
622
623 /* default aevent timeout in units of 100ms */
624 #define XFRM_AE_ETIME 10
625 /* Async Event timer multiplier */
626 #define XFRM_AE_ETH_M 10
627 /* default seq threshold size */
628 #define XFRM_AE_SEQT_SIZE 2
629
630 struct xfrm_mgr {
631 struct list_head list;
632 int (*notify)(struct xfrm_state *x, const struct km_event *c);
633 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
634 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
635 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
636 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
637 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
638 int (*migrate)(const struct xfrm_selector *sel,
639 u8 dir, u8 type,
640 const struct xfrm_migrate *m,
641 int num_bundles,
642 const struct xfrm_kmaddress *k,
643 const struct xfrm_encap_tmpl *encap);
644 bool (*is_alive)(const struct km_event *c);
645 };
646
647 int xfrm_register_km(struct xfrm_mgr *km);
648 int xfrm_unregister_km(struct xfrm_mgr *km);
649
650 struct xfrm_tunnel_skb_cb {
651 union {
652 struct inet_skb_parm h4;
653 struct inet6_skb_parm h6;
654 } header;
655
656 union {
657 struct ip_tunnel *ip4;
658 struct ip6_tnl *ip6;
659 } tunnel;
660 };
661
662 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
663
664 /*
665 * This structure is used for the duration where packets are being
666 * transformed by IPsec. As soon as the packet leaves IPsec the
667 * area beyond the generic IP part may be overwritten.
668 */
669 struct xfrm_skb_cb {
670 struct xfrm_tunnel_skb_cb header;
671
672 /* Sequence number for replay protection. */
673 union {
674 struct {
675 __u32 low;
676 __u32 hi;
677 } output;
678 struct {
679 __be32 low;
680 __be32 hi;
681 } input;
682 } seq;
683 };
684
685 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
686
687 /*
688 * This structure is used by the afinfo prepare_input/prepare_output functions
689 * to transmit header information to the mode input/output functions.
690 */
691 struct xfrm_mode_skb_cb {
692 struct xfrm_tunnel_skb_cb header;
693
694 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
695 __be16 id;
696 __be16 frag_off;
697
698 /* IP header length (excluding options or extension headers). */
699 u8 ihl;
700
701 /* TOS for IPv4, class for IPv6. */
702 u8 tos;
703
704 /* TTL for IPv4, hop limitfor IPv6. */
705 u8 ttl;
706
707 /* Protocol for IPv4, NH for IPv6. */
708 u8 protocol;
709
710 /* Option length for IPv4, zero for IPv6. */
711 u8 optlen;
712
713 /* Used by IPv6 only, zero for IPv4. */
714 u8 flow_lbl[3];
715 };
716
717 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
718
719 /*
720 * This structure is used by the input processing to locate the SPI and
721 * related information.
722 */
723 struct xfrm_spi_skb_cb {
724 struct xfrm_tunnel_skb_cb header;
725
726 unsigned int daddroff;
727 unsigned int family;
728 __be32 seq;
729 };
730
731 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
732
733 #ifdef CONFIG_AUDITSYSCALL
734 static inline struct audit_buffer *xfrm_audit_start(const char *op)
735 {
736 struct audit_buffer *audit_buf = NULL;
737
738 if (audit_enabled == 0)
739 return NULL;
740 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
741 AUDIT_MAC_IPSEC_EVENT);
742 if (audit_buf == NULL)
743 return NULL;
744 audit_log_format(audit_buf, "op=%s", op);
745 return audit_buf;
746 }
747
748 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
749 struct audit_buffer *audit_buf)
750 {
751 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
752 audit_get_loginuid(current) :
753 INVALID_UID);
754 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
755 (unsigned int) -1;
756
757 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
758 audit_log_task_context(audit_buf);
759 }
760
761 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
762 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
763 bool task_valid);
764 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
765 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
766 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
767 struct sk_buff *skb);
768 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
769 __be32 net_seq);
770 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
771 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
772 __be32 net_seq);
773 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
774 u8 proto);
775 #else
776
777 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
778 bool task_valid)
779 {
780 }
781
782 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
783 bool task_valid)
784 {
785 }
786
787 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
788 bool task_valid)
789 {
790 }
791
792 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
793 bool task_valid)
794 {
795 }
796
797 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
798 struct sk_buff *skb)
799 {
800 }
801
802 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
803 struct sk_buff *skb, __be32 net_seq)
804 {
805 }
806
807 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
808 u16 family)
809 {
810 }
811
812 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
813 __be32 net_spi, __be32 net_seq)
814 {
815 }
816
817 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
818 struct sk_buff *skb, u8 proto)
819 {
820 }
821 #endif /* CONFIG_AUDITSYSCALL */
822
823 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
824 {
825 if (likely(policy != NULL))
826 refcount_inc(&policy->refcnt);
827 }
828
829 void xfrm_policy_destroy(struct xfrm_policy *policy);
830
831 static inline void xfrm_pol_put(struct xfrm_policy *policy)
832 {
833 if (refcount_dec_and_test(&policy->refcnt))
834 xfrm_policy_destroy(policy);
835 }
836
837 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
838 {
839 int i;
840 for (i = npols - 1; i >= 0; --i)
841 xfrm_pol_put(pols[i]);
842 }
843
844 void __xfrm_state_destroy(struct xfrm_state *);
845
846 static inline void __xfrm_state_put(struct xfrm_state *x)
847 {
848 refcount_dec(&x->refcnt);
849 }
850
851 static inline void xfrm_state_put(struct xfrm_state *x)
852 {
853 if (refcount_dec_and_test(&x->refcnt))
854 __xfrm_state_destroy(x);
855 }
856
857 static inline void xfrm_state_hold(struct xfrm_state *x)
858 {
859 refcount_inc(&x->refcnt);
860 }
861
862 static inline bool addr_match(const void *token1, const void *token2,
863 unsigned int prefixlen)
864 {
865 const __be32 *a1 = token1;
866 const __be32 *a2 = token2;
867 unsigned int pdw;
868 unsigned int pbi;
869
870 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
871 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
872
873 if (pdw)
874 if (memcmp(a1, a2, pdw << 2))
875 return false;
876
877 if (pbi) {
878 __be32 mask;
879
880 mask = htonl((0xffffffff) << (32 - pbi));
881
882 if ((a1[pdw] ^ a2[pdw]) & mask)
883 return false;
884 }
885
886 return true;
887 }
888
889 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
890 {
891 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
892 if (sizeof(long) == 4 && prefixlen == 0)
893 return true;
894 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
895 }
896
897 static __inline__
898 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
899 {
900 __be16 port;
901 switch(fl->flowi_proto) {
902 case IPPROTO_TCP:
903 case IPPROTO_UDP:
904 case IPPROTO_UDPLITE:
905 case IPPROTO_SCTP:
906 port = uli->ports.sport;
907 break;
908 case IPPROTO_ICMP:
909 case IPPROTO_ICMPV6:
910 port = htons(uli->icmpt.type);
911 break;
912 case IPPROTO_MH:
913 port = htons(uli->mht.type);
914 break;
915 case IPPROTO_GRE:
916 port = htons(ntohl(uli->gre_key) >> 16);
917 break;
918 default:
919 port = 0; /*XXX*/
920 }
921 return port;
922 }
923
924 static __inline__
925 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
926 {
927 __be16 port;
928 switch(fl->flowi_proto) {
929 case IPPROTO_TCP:
930 case IPPROTO_UDP:
931 case IPPROTO_UDPLITE:
932 case IPPROTO_SCTP:
933 port = uli->ports.dport;
934 break;
935 case IPPROTO_ICMP:
936 case IPPROTO_ICMPV6:
937 port = htons(uli->icmpt.code);
938 break;
939 case IPPROTO_GRE:
940 port = htons(ntohl(uli->gre_key) & 0xffff);
941 break;
942 default:
943 port = 0; /*XXX*/
944 }
945 return port;
946 }
947
948 bool xfrm_selector_match(const struct xfrm_selector *sel,
949 const struct flowi *fl, unsigned short family);
950
951 #ifdef CONFIG_SECURITY_NETWORK_XFRM
952 /* If neither has a context --> match
953 * Otherwise, both must have a context and the sids, doi, alg must match
954 */
955 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
956 {
957 return ((!s1 && !s2) ||
958 (s1 && s2 &&
959 (s1->ctx_sid == s2->ctx_sid) &&
960 (s1->ctx_doi == s2->ctx_doi) &&
961 (s1->ctx_alg == s2->ctx_alg)));
962 }
963 #else
964 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
965 {
966 return true;
967 }
968 #endif
969
970 /* A struct encoding bundle of transformations to apply to some set of flow.
971 *
972 * xdst->child points to the next element of bundle.
973 * dst->xfrm points to an instanse of transformer.
974 *
975 * Due to unfortunate limitations of current routing cache, which we
976 * have no time to fix, it mirrors struct rtable and bound to the same
977 * routing key, including saddr,daddr. However, we can have many of
978 * bundles differing by session id. All the bundles grow from a parent
979 * policy rule.
980 */
981 struct xfrm_dst {
982 union {
983 struct dst_entry dst;
984 struct rtable rt;
985 struct rt6_info rt6;
986 } u;
987 struct dst_entry *route;
988 struct dst_entry *child;
989 struct dst_entry *path;
990 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
991 int num_pols, num_xfrms;
992 u32 xfrm_genid;
993 u32 policy_genid;
994 u32 route_mtu_cached;
995 u32 child_mtu_cached;
996 u32 route_cookie;
997 u32 path_cookie;
998 };
999
1000 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
1001 {
1002 #ifdef CONFIG_XFRM
1003 if (dst->xfrm) {
1004 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
1005
1006 return xdst->path;
1007 }
1008 #endif
1009 return (struct dst_entry *) dst;
1010 }
1011
1012 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1013 {
1014 #ifdef CONFIG_XFRM
1015 if (dst->xfrm) {
1016 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1017 return xdst->child;
1018 }
1019 #endif
1020 return NULL;
1021 }
1022
1023 #ifdef CONFIG_XFRM
1024 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
1025 {
1026 xdst->child = child;
1027 }
1028
1029 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1030 {
1031 xfrm_pols_put(xdst->pols, xdst->num_pols);
1032 dst_release(xdst->route);
1033 if (likely(xdst->u.dst.xfrm))
1034 xfrm_state_put(xdst->u.dst.xfrm);
1035 }
1036 #endif
1037
1038 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1039
1040 struct xfrm_offload {
1041 /* Output sequence number for replay protection on offloading. */
1042 struct {
1043 __u32 low;
1044 __u32 hi;
1045 } seq;
1046
1047 __u32 flags;
1048 #define SA_DELETE_REQ 1
1049 #define CRYPTO_DONE 2
1050 #define CRYPTO_NEXT_DONE 4
1051 #define CRYPTO_FALLBACK 8
1052 #define XFRM_GSO_SEGMENT 16
1053 #define XFRM_GRO 32
1054 #define XFRM_ESP_NO_TRAILER 64
1055 #define XFRM_DEV_RESUME 128
1056
1057 __u32 status;
1058 #define CRYPTO_SUCCESS 1
1059 #define CRYPTO_GENERIC_ERROR 2
1060 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1061 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1062 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1063 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1064 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1065 #define CRYPTO_INVALID_PROTOCOL 128
1066
1067 __u8 proto;
1068 };
1069
1070 struct sec_path {
1071 refcount_t refcnt;
1072 int len;
1073 int olen;
1074
1075 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1076 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1077 };
1078
1079 static inline int secpath_exists(struct sk_buff *skb)
1080 {
1081 #ifdef CONFIG_XFRM
1082 return skb->sp != NULL;
1083 #else
1084 return 0;
1085 #endif
1086 }
1087
1088 static inline struct sec_path *
1089 secpath_get(struct sec_path *sp)
1090 {
1091 if (sp)
1092 refcount_inc(&sp->refcnt);
1093 return sp;
1094 }
1095
1096 void __secpath_destroy(struct sec_path *sp);
1097
1098 static inline void
1099 secpath_put(struct sec_path *sp)
1100 {
1101 if (sp && refcount_dec_and_test(&sp->refcnt))
1102 __secpath_destroy(sp);
1103 }
1104
1105 struct sec_path *secpath_dup(struct sec_path *src);
1106 int secpath_set(struct sk_buff *skb);
1107
1108 static inline void
1109 secpath_reset(struct sk_buff *skb)
1110 {
1111 #ifdef CONFIG_XFRM
1112 secpath_put(skb->sp);
1113 skb->sp = NULL;
1114 #endif
1115 }
1116
1117 static inline int
1118 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1119 {
1120 switch (family) {
1121 case AF_INET:
1122 return addr->a4 == 0;
1123 case AF_INET6:
1124 return ipv6_addr_any(&addr->in6);
1125 }
1126 return 0;
1127 }
1128
1129 static inline int
1130 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1131 {
1132 return (tmpl->saddr.a4 &&
1133 tmpl->saddr.a4 != x->props.saddr.a4);
1134 }
1135
1136 static inline int
1137 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1138 {
1139 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1140 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1141 }
1142
1143 static inline int
1144 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1145 {
1146 switch (family) {
1147 case AF_INET:
1148 return __xfrm4_state_addr_cmp(tmpl, x);
1149 case AF_INET6:
1150 return __xfrm6_state_addr_cmp(tmpl, x);
1151 }
1152 return !0;
1153 }
1154
1155 #ifdef CONFIG_XFRM
1156 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1157 unsigned short family);
1158
1159 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1160 struct sk_buff *skb,
1161 unsigned int family, int reverse)
1162 {
1163 struct net *net = dev_net(skb->dev);
1164 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1165
1166 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1167 return __xfrm_policy_check(sk, ndir, skb, family);
1168
1169 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1170 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1171 __xfrm_policy_check(sk, ndir, skb, family);
1172 }
1173
1174 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1175 {
1176 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1177 }
1178
1179 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1180 {
1181 return xfrm_policy_check(sk, dir, skb, AF_INET);
1182 }
1183
1184 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1185 {
1186 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1187 }
1188
1189 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1190 struct sk_buff *skb)
1191 {
1192 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1193 }
1194
1195 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1196 struct sk_buff *skb)
1197 {
1198 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1199 }
1200
1201 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1202 unsigned int family, int reverse);
1203
1204 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1205 unsigned int family)
1206 {
1207 return __xfrm_decode_session(skb, fl, family, 0);
1208 }
1209
1210 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1211 struct flowi *fl,
1212 unsigned int family)
1213 {
1214 return __xfrm_decode_session(skb, fl, family, 1);
1215 }
1216
1217 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1218
1219 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1220 {
1221 struct net *net = dev_net(skb->dev);
1222
1223 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1224 (skb_dst(skb)->flags & DST_NOXFRM) ||
1225 __xfrm_route_forward(skb, family);
1226 }
1227
1228 static inline int xfrm4_route_forward(struct sk_buff *skb)
1229 {
1230 return xfrm_route_forward(skb, AF_INET);
1231 }
1232
1233 static inline int xfrm6_route_forward(struct sk_buff *skb)
1234 {
1235 return xfrm_route_forward(skb, AF_INET6);
1236 }
1237
1238 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1239
1240 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1241 {
1242 sk->sk_policy[0] = NULL;
1243 sk->sk_policy[1] = NULL;
1244 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1245 return __xfrm_sk_clone_policy(sk, osk);
1246 return 0;
1247 }
1248
1249 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1250
1251 static inline void xfrm_sk_free_policy(struct sock *sk)
1252 {
1253 struct xfrm_policy *pol;
1254
1255 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1256 if (unlikely(pol != NULL)) {
1257 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1258 sk->sk_policy[0] = NULL;
1259 }
1260 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1261 if (unlikely(pol != NULL)) {
1262 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1263 sk->sk_policy[1] = NULL;
1264 }
1265 }
1266
1267 #else
1268
1269 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1270 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1271 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1272 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1273 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1274 {
1275 return 1;
1276 }
1277 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1278 {
1279 return 1;
1280 }
1281 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1282 {
1283 return 1;
1284 }
1285 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1286 struct flowi *fl,
1287 unsigned int family)
1288 {
1289 return -ENOSYS;
1290 }
1291 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1292 struct sk_buff *skb)
1293 {
1294 return 1;
1295 }
1296 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1297 struct sk_buff *skb)
1298 {
1299 return 1;
1300 }
1301 #endif
1302
1303 static __inline__
1304 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1305 {
1306 switch (family){
1307 case AF_INET:
1308 return (xfrm_address_t *)&fl->u.ip4.daddr;
1309 case AF_INET6:
1310 return (xfrm_address_t *)&fl->u.ip6.daddr;
1311 }
1312 return NULL;
1313 }
1314
1315 static __inline__
1316 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1317 {
1318 switch (family){
1319 case AF_INET:
1320 return (xfrm_address_t *)&fl->u.ip4.saddr;
1321 case AF_INET6:
1322 return (xfrm_address_t *)&fl->u.ip6.saddr;
1323 }
1324 return NULL;
1325 }
1326
1327 static __inline__
1328 void xfrm_flowi_addr_get(const struct flowi *fl,
1329 xfrm_address_t *saddr, xfrm_address_t *daddr,
1330 unsigned short family)
1331 {
1332 switch(family) {
1333 case AF_INET:
1334 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1335 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1336 break;
1337 case AF_INET6:
1338 saddr->in6 = fl->u.ip6.saddr;
1339 daddr->in6 = fl->u.ip6.daddr;
1340 break;
1341 }
1342 }
1343
1344 static __inline__ int
1345 __xfrm4_state_addr_check(const struct xfrm_state *x,
1346 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1347 {
1348 if (daddr->a4 == x->id.daddr.a4 &&
1349 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1350 return 1;
1351 return 0;
1352 }
1353
1354 static __inline__ int
1355 __xfrm6_state_addr_check(const struct xfrm_state *x,
1356 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1357 {
1358 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1359 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1360 ipv6_addr_any((struct in6_addr *)saddr) ||
1361 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1362 return 1;
1363 return 0;
1364 }
1365
1366 static __inline__ int
1367 xfrm_state_addr_check(const struct xfrm_state *x,
1368 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1369 unsigned short family)
1370 {
1371 switch (family) {
1372 case AF_INET:
1373 return __xfrm4_state_addr_check(x, daddr, saddr);
1374 case AF_INET6:
1375 return __xfrm6_state_addr_check(x, daddr, saddr);
1376 }
1377 return 0;
1378 }
1379
1380 static __inline__ int
1381 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1382 unsigned short family)
1383 {
1384 switch (family) {
1385 case AF_INET:
1386 return __xfrm4_state_addr_check(x,
1387 (const xfrm_address_t *)&fl->u.ip4.daddr,
1388 (const xfrm_address_t *)&fl->u.ip4.saddr);
1389 case AF_INET6:
1390 return __xfrm6_state_addr_check(x,
1391 (const xfrm_address_t *)&fl->u.ip6.daddr,
1392 (const xfrm_address_t *)&fl->u.ip6.saddr);
1393 }
1394 return 0;
1395 }
1396
1397 static inline int xfrm_state_kern(const struct xfrm_state *x)
1398 {
1399 return atomic_read(&x->tunnel_users);
1400 }
1401
1402 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1403 {
1404 return (!userproto || proto == userproto ||
1405 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1406 proto == IPPROTO_ESP ||
1407 proto == IPPROTO_COMP)));
1408 }
1409
1410 /*
1411 * xfrm algorithm information
1412 */
1413 struct xfrm_algo_aead_info {
1414 char *geniv;
1415 u16 icv_truncbits;
1416 };
1417
1418 struct xfrm_algo_auth_info {
1419 u16 icv_truncbits;
1420 u16 icv_fullbits;
1421 };
1422
1423 struct xfrm_algo_encr_info {
1424 char *geniv;
1425 u16 blockbits;
1426 u16 defkeybits;
1427 };
1428
1429 struct xfrm_algo_comp_info {
1430 u16 threshold;
1431 };
1432
1433 struct xfrm_algo_desc {
1434 char *name;
1435 char *compat;
1436 u8 available:1;
1437 u8 pfkey_supported:1;
1438 union {
1439 struct xfrm_algo_aead_info aead;
1440 struct xfrm_algo_auth_info auth;
1441 struct xfrm_algo_encr_info encr;
1442 struct xfrm_algo_comp_info comp;
1443 } uinfo;
1444 struct sadb_alg desc;
1445 };
1446
1447 /* XFRM protocol handlers. */
1448 struct xfrm4_protocol {
1449 int (*handler)(struct sk_buff *skb);
1450 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1451 int encap_type);
1452 int (*cb_handler)(struct sk_buff *skb, int err);
1453 int (*err_handler)(struct sk_buff *skb, u32 info);
1454
1455 struct xfrm4_protocol __rcu *next;
1456 int priority;
1457 };
1458
1459 struct xfrm6_protocol {
1460 int (*handler)(struct sk_buff *skb);
1461 int (*cb_handler)(struct sk_buff *skb, int err);
1462 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1463 u8 type, u8 code, int offset, __be32 info);
1464
1465 struct xfrm6_protocol __rcu *next;
1466 int priority;
1467 };
1468
1469 /* XFRM tunnel handlers. */
1470 struct xfrm_tunnel {
1471 int (*handler)(struct sk_buff *skb);
1472 int (*err_handler)(struct sk_buff *skb, u32 info);
1473
1474 struct xfrm_tunnel __rcu *next;
1475 int priority;
1476 };
1477
1478 struct xfrm6_tunnel {
1479 int (*handler)(struct sk_buff *skb);
1480 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1481 u8 type, u8 code, int offset, __be32 info);
1482 struct xfrm6_tunnel __rcu *next;
1483 int priority;
1484 };
1485
1486 void xfrm_init(void);
1487 void xfrm4_init(void);
1488 int xfrm_state_init(struct net *net);
1489 void xfrm_state_fini(struct net *net);
1490 void xfrm4_state_init(void);
1491 void xfrm4_protocol_init(void);
1492 #ifdef CONFIG_XFRM
1493 int xfrm6_init(void);
1494 void xfrm6_fini(void);
1495 int xfrm6_state_init(void);
1496 void xfrm6_state_fini(void);
1497 int xfrm6_protocol_init(void);
1498 void xfrm6_protocol_fini(void);
1499 #else
1500 static inline int xfrm6_init(void)
1501 {
1502 return 0;
1503 }
1504 static inline void xfrm6_fini(void)
1505 {
1506 ;
1507 }
1508 #endif
1509
1510 #ifdef CONFIG_XFRM_STATISTICS
1511 int xfrm_proc_init(struct net *net);
1512 void xfrm_proc_fini(struct net *net);
1513 #endif
1514
1515 int xfrm_sysctl_init(struct net *net);
1516 #ifdef CONFIG_SYSCTL
1517 void xfrm_sysctl_fini(struct net *net);
1518 #else
1519 static inline void xfrm_sysctl_fini(struct net *net)
1520 {
1521 }
1522 #endif
1523
1524 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1525 struct xfrm_address_filter *filter);
1526 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1527 int (*func)(struct xfrm_state *, int, void*), void *);
1528 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1529 struct xfrm_state *xfrm_state_alloc(struct net *net);
1530 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1531 const xfrm_address_t *saddr,
1532 const struct flowi *fl,
1533 struct xfrm_tmpl *tmpl,
1534 struct xfrm_policy *pol, int *err,
1535 unsigned short family);
1536 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1537 xfrm_address_t *daddr,
1538 xfrm_address_t *saddr,
1539 unsigned short family,
1540 u8 mode, u8 proto, u32 reqid);
1541 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1542 unsigned short family);
1543 int xfrm_state_check_expire(struct xfrm_state *x);
1544 void xfrm_state_insert(struct xfrm_state *x);
1545 int xfrm_state_add(struct xfrm_state *x);
1546 int xfrm_state_update(struct xfrm_state *x);
1547 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1548 const xfrm_address_t *daddr, __be32 spi,
1549 u8 proto, unsigned short family);
1550 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1551 const xfrm_address_t *daddr,
1552 const xfrm_address_t *saddr,
1553 u8 proto,
1554 unsigned short family);
1555 #ifdef CONFIG_XFRM_SUB_POLICY
1556 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1557 unsigned short family, struct net *net);
1558 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1559 unsigned short family);
1560 #else
1561 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1562 int n, unsigned short family, struct net *net)
1563 {
1564 return -ENOSYS;
1565 }
1566
1567 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1568 int n, unsigned short family)
1569 {
1570 return -ENOSYS;
1571 }
1572 #endif
1573
1574 struct xfrmk_sadinfo {
1575 u32 sadhcnt; /* current hash bkts */
1576 u32 sadhmcnt; /* max allowed hash bkts */
1577 u32 sadcnt; /* current running count */
1578 };
1579
1580 struct xfrmk_spdinfo {
1581 u32 incnt;
1582 u32 outcnt;
1583 u32 fwdcnt;
1584 u32 inscnt;
1585 u32 outscnt;
1586 u32 fwdscnt;
1587 u32 spdhcnt;
1588 u32 spdhmcnt;
1589 };
1590
1591 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1592 int xfrm_state_delete(struct xfrm_state *x);
1593 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1594 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1595 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1596 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1597 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1598 int xfrm_init_replay(struct xfrm_state *x);
1599 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1600 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1601 int xfrm_init_state(struct xfrm_state *x);
1602 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1603 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1604 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1605 int xfrm_trans_queue(struct sk_buff *skb,
1606 int (*finish)(struct net *, struct sock *,
1607 struct sk_buff *));
1608 int xfrm_output_resume(struct sk_buff *skb, int err);
1609 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1610 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1611 void xfrm_local_error(struct sk_buff *skb, int mtu);
1612 int xfrm4_extract_header(struct sk_buff *skb);
1613 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1614 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1615 int encap_type);
1616 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1617 int xfrm4_rcv(struct sk_buff *skb);
1618 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1619
1620 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1621 {
1622 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1623 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1624 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1625 return xfrm_input(skb, nexthdr, spi, 0);
1626 }
1627
1628 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1629 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1630 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1631 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1632 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1633 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1634 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1635 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1636 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1637 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1638 int xfrm6_extract_header(struct sk_buff *skb);
1639 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1640 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1641 struct ip6_tnl *t);
1642 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1643 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1644 int xfrm6_rcv(struct sk_buff *skb);
1645 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1646 xfrm_address_t *saddr, u8 proto);
1647 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1648 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1649 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1650 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1651 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1652 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1653 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1654 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1655 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1656 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1657 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1658 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1659 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1660 u8 **prevhdr);
1661
1662 #ifdef CONFIG_XFRM
1663 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1664 int xfrm_user_policy(struct sock *sk, int optname,
1665 u8 __user *optval, int optlen);
1666 #else
1667 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1668 {
1669 return -ENOPROTOOPT;
1670 }
1671
1672 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1673 {
1674 /* should not happen */
1675 kfree_skb(skb);
1676 return 0;
1677 }
1678 #endif
1679
1680 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1681 const xfrm_address_t *saddr,
1682 const xfrm_address_t *daddr,
1683 int family, u32 mark);
1684
1685 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1686
1687 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1688 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1689 int (*func)(struct xfrm_policy *, int, int, void*),
1690 void *);
1691 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1692 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1693 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1694 u8 type, int dir,
1695 struct xfrm_selector *sel,
1696 struct xfrm_sec_ctx *ctx, int delete,
1697 int *err);
1698 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1699 u32 id, int delete, int *err);
1700 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1701 void xfrm_policy_hash_rebuild(struct net *net);
1702 u32 xfrm_get_acqseq(void);
1703 int verify_spi_info(u8 proto, u32 min, u32 max);
1704 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1705 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1706 u8 mode, u32 reqid, u8 proto,
1707 const xfrm_address_t *daddr,
1708 const xfrm_address_t *saddr, int create,
1709 unsigned short family);
1710 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1711
1712 #ifdef CONFIG_XFRM_MIGRATE
1713 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1714 const struct xfrm_migrate *m, int num_bundles,
1715 const struct xfrm_kmaddress *k,
1716 const struct xfrm_encap_tmpl *encap);
1717 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1718 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1719 struct xfrm_migrate *m,
1720 struct xfrm_encap_tmpl *encap);
1721 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1722 struct xfrm_migrate *m, int num_bundles,
1723 struct xfrm_kmaddress *k, struct net *net,
1724 struct xfrm_encap_tmpl *encap);
1725 #endif
1726
1727 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1728 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1729 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1730 xfrm_address_t *addr);
1731
1732 void xfrm_input_init(void);
1733 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1734
1735 void xfrm_probe_algs(void);
1736 int xfrm_count_pfkey_auth_supported(void);
1737 int xfrm_count_pfkey_enc_supported(void);
1738 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1739 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1740 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1741 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1742 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1743 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1744 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1745 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1746 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1747 int probe);
1748
1749 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1750 const xfrm_address_t *b)
1751 {
1752 return ipv6_addr_equal((const struct in6_addr *)a,
1753 (const struct in6_addr *)b);
1754 }
1755
1756 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1757 const xfrm_address_t *b,
1758 sa_family_t family)
1759 {
1760 switch (family) {
1761 default:
1762 case AF_INET:
1763 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1764 case AF_INET6:
1765 return xfrm6_addr_equal(a, b);
1766 }
1767 }
1768
1769 static inline int xfrm_policy_id2dir(u32 index)
1770 {
1771 return index & 7;
1772 }
1773
1774 #ifdef CONFIG_XFRM
1775 static inline int xfrm_aevent_is_on(struct net *net)
1776 {
1777 struct sock *nlsk;
1778 int ret = 0;
1779
1780 rcu_read_lock();
1781 nlsk = rcu_dereference(net->xfrm.nlsk);
1782 if (nlsk)
1783 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1784 rcu_read_unlock();
1785 return ret;
1786 }
1787
1788 static inline int xfrm_acquire_is_on(struct net *net)
1789 {
1790 struct sock *nlsk;
1791 int ret = 0;
1792
1793 rcu_read_lock();
1794 nlsk = rcu_dereference(net->xfrm.nlsk);
1795 if (nlsk)
1796 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1797 rcu_read_unlock();
1798
1799 return ret;
1800 }
1801 #endif
1802
1803 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1804 {
1805 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1806 }
1807
1808 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1809 {
1810 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1811 }
1812
1813 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1814 {
1815 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1816 }
1817
1818 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1819 {
1820 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1821 }
1822
1823 #ifdef CONFIG_XFRM_MIGRATE
1824 static inline int xfrm_replay_clone(struct xfrm_state *x,
1825 struct xfrm_state *orig)
1826 {
1827 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1828 GFP_KERNEL);
1829 if (!x->replay_esn)
1830 return -ENOMEM;
1831
1832 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1833 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1834
1835 x->preplay_esn = kmemdup(x->replay_esn,
1836 xfrm_replay_state_esn_len(x->replay_esn),
1837 GFP_KERNEL);
1838 if (!x->preplay_esn) {
1839 kfree(x->replay_esn);
1840 return -ENOMEM;
1841 }
1842
1843 return 0;
1844 }
1845
1846 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1847 {
1848 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1849 }
1850
1851
1852 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1853 {
1854 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1855 }
1856
1857 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1858 {
1859 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1860 }
1861
1862 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1863 {
1864 int i;
1865 for (i = 0; i < n; i++)
1866 xfrm_state_put(*(states + i));
1867 }
1868
1869 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1870 {
1871 int i;
1872 for (i = 0; i < n; i++)
1873 xfrm_state_delete(*(states + i));
1874 }
1875 #endif
1876
1877 #ifdef CONFIG_XFRM
1878 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1879 {
1880 return skb->sp->xvec[skb->sp->len - 1];
1881 }
1882 #endif
1883
1884 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1885 {
1886 #ifdef CONFIG_XFRM
1887 struct sec_path *sp = skb->sp;
1888
1889 if (!sp || !sp->olen || sp->len != sp->olen)
1890 return NULL;
1891
1892 return &sp->ovec[sp->olen - 1];
1893 #else
1894 return NULL;
1895 #endif
1896 }
1897
1898 void __init xfrm_dev_init(void);
1899
1900 #ifdef CONFIG_XFRM_OFFLOAD
1901 void xfrm_dev_resume(struct sk_buff *skb);
1902 void xfrm_dev_backlog(struct softnet_data *sd);
1903 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1904 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1905 struct xfrm_user_offload *xuo);
1906 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1907
1908 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1909 {
1910 struct xfrm_state_offload *xso = &x->xso;
1911
1912 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1913 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1914 }
1915
1916 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1917 {
1918 struct xfrm_state *x = dst->xfrm;
1919 struct xfrm_dst *xdst;
1920
1921 if (!x || !x->type_offload)
1922 return false;
1923
1924 xdst = (struct xfrm_dst *) dst;
1925 if (!x->xso.offload_handle && !xdst->child->xfrm)
1926 return true;
1927 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1928 !xdst->child->xfrm)
1929 return true;
1930
1931 return false;
1932 }
1933
1934 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1935 {
1936 struct xfrm_state_offload *xso = &x->xso;
1937
1938 if (xso->dev)
1939 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1940 }
1941
1942 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1943 {
1944 struct xfrm_state_offload *xso = &x->xso;
1945 struct net_device *dev = xso->dev;
1946
1947 if (dev && dev->xfrmdev_ops) {
1948 if (dev->xfrmdev_ops->xdo_dev_state_free)
1949 dev->xfrmdev_ops->xdo_dev_state_free(x);
1950 xso->dev = NULL;
1951 dev_put(dev);
1952 }
1953 }
1954 #else
1955 static inline void xfrm_dev_resume(struct sk_buff *skb)
1956 {
1957 }
1958
1959 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1960 {
1961 }
1962
1963 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1964 {
1965 return skb;
1966 }
1967
1968 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1969 {
1970 return 0;
1971 }
1972
1973 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1974 {
1975 }
1976
1977 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1978 {
1979 }
1980
1981 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1982 {
1983 return false;
1984 }
1985
1986 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1987 {
1988 }
1989
1990 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1991 {
1992 return false;
1993 }
1994 #endif
1995
1996 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1997 {
1998 if (attrs[XFRMA_MARK])
1999 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2000 else
2001 m->v = m->m = 0;
2002
2003 return m->v & m->m;
2004 }
2005
2006 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2007 {
2008 int ret = 0;
2009
2010 if (m->m | m->v)
2011 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2012 return ret;
2013 }
2014
2015 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2016 unsigned int family)
2017 {
2018 bool tunnel = false;
2019
2020 switch(family) {
2021 case AF_INET:
2022 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2023 tunnel = true;
2024 break;
2025 case AF_INET6:
2026 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2027 tunnel = true;
2028 break;
2029 }
2030 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2031 return -EINVAL;
2032
2033 return 0;
2034 }
2035 #endif /* _NET_XFRM_H */
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