?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / include / net / xfrm.h
blob7d2077665c0b05c1716e808d2bfd6c56af65e3c8
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_state_delete_tunnel(struct xfrm_state *x);
379
380 struct xfrm_type {
381 char *description;
382 struct module *owner;
383 u8 proto;
384 u8 flags;
385 #define XFRM_TYPE_NON_FRAGMENT 1
386 #define XFRM_TYPE_REPLAY_PROT 2
387 #define XFRM_TYPE_LOCAL_COADDR 4
388 #define XFRM_TYPE_REMOTE_COADDR 8
389
390 int (*init_state)(struct xfrm_state *x);
391 void (*destructor)(struct xfrm_state *);
392 int (*input)(struct xfrm_state *, struct sk_buff *skb);
393 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
394 int (*reject)(struct xfrm_state *, struct sk_buff *,
395 const struct flowi *);
396 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
397 /* Estimate maximal size of result of transformation of a dgram */
398 u32 (*get_mtu)(struct xfrm_state *, int size);
399 };
400
401 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
402 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
403
404 struct xfrm_type_offload {
405 char *description;
406 struct module *owner;
407 u8 proto;
408 void (*encap)(struct xfrm_state *, struct sk_buff *pskb);
409 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
410 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
411 };
412
413 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
414 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
415
416 struct xfrm_mode {
417 /*
418 * Remove encapsulation header.
419 *
420 * The IP header will be moved over the top of the encapsulation
421 * header.
422 *
423 * On entry, the transport header shall point to where the IP header
424 * should be and the network header shall be set to where the IP
425 * header currently is. skb->data shall point to the start of the
426 * payload.
427 */
428 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
429
430 /*
431 * This is the actual input entry point.
432 *
433 * For transport mode and equivalent this would be identical to
434 * input2 (which does not need to be set). While tunnel mode
435 * and equivalent would set this to the tunnel encapsulation function
436 * xfrm4_prepare_input that would in turn call input2.
437 */
438 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
439
440 /*
441 * Add encapsulation header.
442 *
443 * On exit, the transport header will be set to the start of the
444 * encapsulation header to be filled in by x->type->output and
445 * the mac header will be set to the nextheader (protocol for
446 * IPv4) field of the extension header directly preceding the
447 * encapsulation header, or in its absence, that of the top IP
448 * header. The value of the network header will always point
449 * to the top IP header while skb->data will point to the payload.
450 */
451 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
452
453 /*
454 * This is the actual output entry point.
455 *
456 * For transport mode and equivalent this would be identical to
457 * output2 (which does not need to be set). While tunnel mode
458 * and equivalent would set this to a tunnel encapsulation function
459 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
460 * call output2.
461 */
462 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
463
464 /*
465 * Adjust pointers into the packet and do GSO segmentation.
466 */
467 struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);
468
469 /*
470 * Adjust pointers into the packet when IPsec is done at layer2.
471 */
472 void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);
473
474 struct xfrm_state_afinfo *afinfo;
475 struct module *owner;
476 unsigned int encap;
477 int flags;
478 };
479
480 /* Flags for xfrm_mode. */
481 enum {
482 XFRM_MODE_FLAG_TUNNEL = 1,
483 };
484
485 int xfrm_register_mode(struct xfrm_mode *mode, int family);
486 int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
487
488 static inline int xfrm_af2proto(unsigned int family)
489 {
490 switch(family) {
491 case AF_INET:
492 return IPPROTO_IPIP;
493 case AF_INET6:
494 return IPPROTO_IPV6;
495 default:
496 return 0;
497 }
498 }
499
500 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
501 {
502 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
503 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
504 return x->inner_mode;
505 else
506 return x->inner_mode_iaf;
507 }
508
509 struct xfrm_tmpl {
510 /* id in template is interpreted as:
511 * daddr - destination of tunnel, may be zero for transport mode.
512 * spi - zero to acquire spi. Not zero if spi is static, then
513 * daddr must be fixed too.
514 * proto - AH/ESP/IPCOMP
515 */
516 struct xfrm_id id;
517
518 /* Source address of tunnel. Ignored, if it is not a tunnel. */
519 xfrm_address_t saddr;
520
521 unsigned short encap_family;
522
523 u32 reqid;
524
525 /* Mode: transport, tunnel etc. */
526 u8 mode;
527
528 /* Sharing mode: unique, this session only, this user only etc. */
529 u8 share;
530
531 /* May skip this transfomration if no SA is found */
532 u8 optional;
533
534 /* Skip aalgos/ealgos/calgos checks. */
535 u8 allalgs;
536
537 /* Bit mask of algos allowed for acquisition */
538 u32 aalgos;
539 u32 ealgos;
540 u32 calgos;
541 };
542
543 #define XFRM_MAX_DEPTH 6
544 #define XFRM_MAX_OFFLOAD_DEPTH 1
545
546 struct xfrm_policy_walk_entry {
547 struct list_head all;
548 u8 dead;
549 };
550
551 struct xfrm_policy_walk {
552 struct xfrm_policy_walk_entry walk;
553 u8 type;
554 u32 seq;
555 };
556
557 struct xfrm_policy_queue {
558 struct sk_buff_head hold_queue;
559 struct timer_list hold_timer;
560 unsigned long timeout;
561 };
562
563 struct xfrm_policy {
564 possible_net_t xp_net;
565 struct hlist_node bydst;
566 struct hlist_node byidx;
567
568 /* This lock only affects elements except for entry. */
569 rwlock_t lock;
570 refcount_t refcnt;
571 struct timer_list timer;
572
573 atomic_t genid;
574 u32 priority;
575 u32 index;
576 struct xfrm_mark mark;
577 struct xfrm_selector selector;
578 struct xfrm_lifetime_cfg lft;
579 struct xfrm_lifetime_cur curlft;
580 struct xfrm_policy_walk_entry walk;
581 struct xfrm_policy_queue polq;
582 u8 type;
583 u8 action;
584 u8 flags;
585 u8 xfrm_nr;
586 u16 family;
587 struct xfrm_sec_ctx *security;
588 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
589 struct rcu_head rcu;
590 };
591
592 static inline struct net *xp_net(const struct xfrm_policy *xp)
593 {
594 return read_pnet(&xp->xp_net);
595 }
596
597 struct xfrm_kmaddress {
598 xfrm_address_t local;
599 xfrm_address_t remote;
600 u32 reserved;
601 u16 family;
602 };
603
604 struct xfrm_migrate {
605 xfrm_address_t old_daddr;
606 xfrm_address_t old_saddr;
607 xfrm_address_t new_daddr;
608 xfrm_address_t new_saddr;
609 u8 proto;
610 u8 mode;
611 u16 reserved;
612 u32 reqid;
613 u16 old_family;
614 u16 new_family;
615 };
616
617 #define XFRM_KM_TIMEOUT 30
618 /* what happened */
619 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
620 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
621
622 /* default aevent timeout in units of 100ms */
623 #define XFRM_AE_ETIME 10
624 /* Async Event timer multiplier */
625 #define XFRM_AE_ETH_M 10
626 /* default seq threshold size */
627 #define XFRM_AE_SEQT_SIZE 2
628
629 struct xfrm_mgr {
630 struct list_head list;
631 int (*notify)(struct xfrm_state *x, const struct km_event *c);
632 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
633 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
634 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
635 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
636 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
637 int (*migrate)(const struct xfrm_selector *sel,
638 u8 dir, u8 type,
639 const struct xfrm_migrate *m,
640 int num_bundles,
641 const struct xfrm_kmaddress *k,
642 const struct xfrm_encap_tmpl *encap);
643 bool (*is_alive)(const struct km_event *c);
644 };
645
646 int xfrm_register_km(struct xfrm_mgr *km);
647 int xfrm_unregister_km(struct xfrm_mgr *km);
648
649 struct xfrm_tunnel_skb_cb {
650 union {
651 struct inet_skb_parm h4;
652 struct inet6_skb_parm h6;
653 } header;
654
655 union {
656 struct ip_tunnel *ip4;
657 struct ip6_tnl *ip6;
658 } tunnel;
659 };
660
661 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
662
663 /*
664 * This structure is used for the duration where packets are being
665 * transformed by IPsec. As soon as the packet leaves IPsec the
666 * area beyond the generic IP part may be overwritten.
667 */
668 struct xfrm_skb_cb {
669 struct xfrm_tunnel_skb_cb header;
670
671 /* Sequence number for replay protection. */
672 union {
673 struct {
674 __u32 low;
675 __u32 hi;
676 } output;
677 struct {
678 __be32 low;
679 __be32 hi;
680 } input;
681 } seq;
682 };
683
684 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
685
686 /*
687 * This structure is used by the afinfo prepare_input/prepare_output functions
688 * to transmit header information to the mode input/output functions.
689 */
690 struct xfrm_mode_skb_cb {
691 struct xfrm_tunnel_skb_cb header;
692
693 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
694 __be16 id;
695 __be16 frag_off;
696
697 /* IP header length (excluding options or extension headers). */
698 u8 ihl;
699
700 /* TOS for IPv4, class for IPv6. */
701 u8 tos;
702
703 /* TTL for IPv4, hop limitfor IPv6. */
704 u8 ttl;
705
706 /* Protocol for IPv4, NH for IPv6. */
707 u8 protocol;
708
709 /* Option length for IPv4, zero for IPv6. */
710 u8 optlen;
711
712 /* Used by IPv6 only, zero for IPv4. */
713 u8 flow_lbl[3];
714 };
715
716 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
717
718 /*
719 * This structure is used by the input processing to locate the SPI and
720 * related information.
721 */
722 struct xfrm_spi_skb_cb {
723 struct xfrm_tunnel_skb_cb header;
724
725 unsigned int daddroff;
726 unsigned int family;
727 __be32 seq;
728 };
729
730 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
731
732 #ifdef CONFIG_AUDITSYSCALL
733 static inline struct audit_buffer *xfrm_audit_start(const char *op)
734 {
735 struct audit_buffer *audit_buf = NULL;
736
737 if (audit_enabled == 0)
738 return NULL;
739 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
740 AUDIT_MAC_IPSEC_EVENT);
741 if (audit_buf == NULL)
742 return NULL;
743 audit_log_format(audit_buf, "op=%s", op);
744 return audit_buf;
745 }
746
747 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
748 struct audit_buffer *audit_buf)
749 {
750 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
751 audit_get_loginuid(current) :
752 INVALID_UID);
753 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
754 (unsigned int) -1;
755
756 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
757 audit_log_task_context(audit_buf);
758 }
759
760 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
761 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
762 bool task_valid);
763 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
764 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
765 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
766 struct sk_buff *skb);
767 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
768 __be32 net_seq);
769 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
770 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
771 __be32 net_seq);
772 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
773 u8 proto);
774 #else
775
776 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
777 bool task_valid)
778 {
779 }
780
781 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
782 bool task_valid)
783 {
784 }
785
786 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
787 bool task_valid)
788 {
789 }
790
791 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
792 bool task_valid)
793 {
794 }
795
796 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
797 struct sk_buff *skb)
798 {
799 }
800
801 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
802 struct sk_buff *skb, __be32 net_seq)
803 {
804 }
805
806 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
807 u16 family)
808 {
809 }
810
811 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
812 __be32 net_spi, __be32 net_seq)
813 {
814 }
815
816 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
817 struct sk_buff *skb, u8 proto)
818 {
819 }
820 #endif /* CONFIG_AUDITSYSCALL */
821
822 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
823 {
824 if (likely(policy != NULL))
825 refcount_inc(&policy->refcnt);
826 }
827
828 void xfrm_policy_destroy(struct xfrm_policy *policy);
829
830 static inline void xfrm_pol_put(struct xfrm_policy *policy)
831 {
832 if (refcount_dec_and_test(&policy->refcnt))
833 xfrm_policy_destroy(policy);
834 }
835
836 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
837 {
838 int i;
839 for (i = npols - 1; i >= 0; --i)
840 xfrm_pol_put(pols[i]);
841 }
842
843 void __xfrm_state_destroy(struct xfrm_state *);
844
845 static inline void __xfrm_state_put(struct xfrm_state *x)
846 {
847 refcount_dec(&x->refcnt);
848 }
849
850 static inline void xfrm_state_put(struct xfrm_state *x)
851 {
852 if (refcount_dec_and_test(&x->refcnt))
853 __xfrm_state_destroy(x);
854 }
855
856 static inline void xfrm_state_hold(struct xfrm_state *x)
857 {
858 refcount_inc(&x->refcnt);
859 }
860
861 static inline bool addr_match(const void *token1, const void *token2,
862 unsigned int prefixlen)
863 {
864 const __be32 *a1 = token1;
865 const __be32 *a2 = token2;
866 unsigned int pdw;
867 unsigned int pbi;
868
869 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
870 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
871
872 if (pdw)
873 if (memcmp(a1, a2, pdw << 2))
874 return false;
875
876 if (pbi) {
877 __be32 mask;
878
879 mask = htonl((0xffffffff) << (32 - pbi));
880
881 if ((a1[pdw] ^ a2[pdw]) & mask)
882 return false;
883 }
884
885 return true;
886 }
887
888 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
889 {
890 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
891 if (sizeof(long) == 4 && prefixlen == 0)
892 return true;
893 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
894 }
895
896 static __inline__
897 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
898 {
899 __be16 port;
900 switch(fl->flowi_proto) {
901 case IPPROTO_TCP:
902 case IPPROTO_UDP:
903 case IPPROTO_UDPLITE:
904 case IPPROTO_SCTP:
905 port = uli->ports.sport;
906 break;
907 case IPPROTO_ICMP:
908 case IPPROTO_ICMPV6:
909 port = htons(uli->icmpt.type);
910 break;
911 case IPPROTO_MH:
912 port = htons(uli->mht.type);
913 break;
914 case IPPROTO_GRE:
915 port = htons(ntohl(uli->gre_key) >> 16);
916 break;
917 default:
918 port = 0; /*XXX*/
919 }
920 return port;
921 }
922
923 static __inline__
924 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
925 {
926 __be16 port;
927 switch(fl->flowi_proto) {
928 case IPPROTO_TCP:
929 case IPPROTO_UDP:
930 case IPPROTO_UDPLITE:
931 case IPPROTO_SCTP:
932 port = uli->ports.dport;
933 break;
934 case IPPROTO_ICMP:
935 case IPPROTO_ICMPV6:
936 port = htons(uli->icmpt.code);
937 break;
938 case IPPROTO_GRE:
939 port = htons(ntohl(uli->gre_key) & 0xffff);
940 break;
941 default:
942 port = 0; /*XXX*/
943 }
944 return port;
945 }
946
947 bool xfrm_selector_match(const struct xfrm_selector *sel,
948 const struct flowi *fl, unsigned short family);
949
950 #ifdef CONFIG_SECURITY_NETWORK_XFRM
951 /* If neither has a context --> match
952 * Otherwise, both must have a context and the sids, doi, alg must match
953 */
954 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
955 {
956 return ((!s1 && !s2) ||
957 (s1 && s2 &&
958 (s1->ctx_sid == s2->ctx_sid) &&
959 (s1->ctx_doi == s2->ctx_doi) &&
960 (s1->ctx_alg == s2->ctx_alg)));
961 }
962 #else
963 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
964 {
965 return true;
966 }
967 #endif
968
969 /* A struct encoding bundle of transformations to apply to some set of flow.
970 *
971 * xdst->child points to the next element of bundle.
972 * dst->xfrm points to an instanse of transformer.
973 *
974 * Due to unfortunate limitations of current routing cache, which we
975 * have no time to fix, it mirrors struct rtable and bound to the same
976 * routing key, including saddr,daddr. However, we can have many of
977 * bundles differing by session id. All the bundles grow from a parent
978 * policy rule.
979 */
980 struct xfrm_dst {
981 union {
982 struct dst_entry dst;
983 struct rtable rt;
984 struct rt6_info rt6;
985 } u;
986 struct dst_entry *route;
987 struct dst_entry *child;
988 struct dst_entry *path;
989 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
990 int num_pols, num_xfrms;
991 u32 xfrm_genid;
992 u32 policy_genid;
993 u32 route_mtu_cached;
994 u32 child_mtu_cached;
995 u32 route_cookie;
996 u32 path_cookie;
997 };
998
999 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
1000 {
1001 #ifdef CONFIG_XFRM
1002 if (dst->xfrm) {
1003 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
1004
1005 return xdst->path;
1006 }
1007 #endif
1008 return (struct dst_entry *) dst;
1009 }
1010
1011 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1012 {
1013 #ifdef CONFIG_XFRM
1014 if (dst->xfrm) {
1015 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1016 return xdst->child;
1017 }
1018 #endif
1019 return NULL;
1020 }
1021
1022 #ifdef CONFIG_XFRM
1023 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
1024 {
1025 xdst->child = child;
1026 }
1027
1028 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1029 {
1030 xfrm_pols_put(xdst->pols, xdst->num_pols);
1031 dst_release(xdst->route);
1032 if (likely(xdst->u.dst.xfrm))
1033 xfrm_state_put(xdst->u.dst.xfrm);
1034 }
1035 #endif
1036
1037 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1038
1039 struct xfrm_offload {
1040 /* Output sequence number for replay protection on offloading. */
1041 struct {
1042 __u32 low;
1043 __u32 hi;
1044 } seq;
1045
1046 __u32 flags;
1047 #define SA_DELETE_REQ 1
1048 #define CRYPTO_DONE 2
1049 #define CRYPTO_NEXT_DONE 4
1050 #define CRYPTO_FALLBACK 8
1051 #define XFRM_GSO_SEGMENT 16
1052 #define XFRM_GRO 32
1053 #define XFRM_ESP_NO_TRAILER 64
1054 #define XFRM_DEV_RESUME 128
1055
1056 __u32 status;
1057 #define CRYPTO_SUCCESS 1
1058 #define CRYPTO_GENERIC_ERROR 2
1059 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4
1060 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8
1061 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16
1062 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32
1063 #define CRYPTO_INVALID_PACKET_SYNTAX 64
1064 #define CRYPTO_INVALID_PROTOCOL 128
1065
1066 __u8 proto;
1067 };
1068
1069 struct sec_path {
1070 refcount_t refcnt;
1071 int len;
1072 int olen;
1073
1074 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1075 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
1076 };
1077
1078 static inline int secpath_exists(struct sk_buff *skb)
1079 {
1080 #ifdef CONFIG_XFRM
1081 return skb->sp != NULL;
1082 #else
1083 return 0;
1084 #endif
1085 }
1086
1087 static inline struct sec_path *
1088 secpath_get(struct sec_path *sp)
1089 {
1090 if (sp)
1091 refcount_inc(&sp->refcnt);
1092 return sp;
1093 }
1094
1095 void __secpath_destroy(struct sec_path *sp);
1096
1097 static inline void
1098 secpath_put(struct sec_path *sp)
1099 {
1100 if (sp && refcount_dec_and_test(&sp->refcnt))
1101 __secpath_destroy(sp);
1102 }
1103
1104 struct sec_path *secpath_dup(struct sec_path *src);
1105 int secpath_set(struct sk_buff *skb);
1106
1107 static inline void
1108 secpath_reset(struct sk_buff *skb)
1109 {
1110 #ifdef CONFIG_XFRM
1111 secpath_put(skb->sp);
1112 skb->sp = NULL;
1113 #endif
1114 }
1115
1116 static inline int
1117 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1118 {
1119 switch (family) {
1120 case AF_INET:
1121 return addr->a4 == 0;
1122 case AF_INET6:
1123 return ipv6_addr_any(&addr->in6);
1124 }
1125 return 0;
1126 }
1127
1128 static inline int
1129 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1130 {
1131 return (tmpl->saddr.a4 &&
1132 tmpl->saddr.a4 != x->props.saddr.a4);
1133 }
1134
1135 static inline int
1136 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1137 {
1138 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1139 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1140 }
1141
1142 static inline int
1143 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1144 {
1145 switch (family) {
1146 case AF_INET:
1147 return __xfrm4_state_addr_cmp(tmpl, x);
1148 case AF_INET6:
1149 return __xfrm6_state_addr_cmp(tmpl, x);
1150 }
1151 return !0;
1152 }
1153
1154 #ifdef CONFIG_XFRM
1155 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1156 unsigned short family);
1157
1158 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1159 struct sk_buff *skb,
1160 unsigned int family, int reverse)
1161 {
1162 struct net *net = dev_net(skb->dev);
1163 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1164
1165 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1166 return __xfrm_policy_check(sk, ndir, skb, family);
1167
1168 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1169 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1170 __xfrm_policy_check(sk, ndir, skb, family);
1171 }
1172
1173 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1174 {
1175 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1176 }
1177
1178 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1179 {
1180 return xfrm_policy_check(sk, dir, skb, AF_INET);
1181 }
1182
1183 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1184 {
1185 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1186 }
1187
1188 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1189 struct sk_buff *skb)
1190 {
1191 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1192 }
1193
1194 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1195 struct sk_buff *skb)
1196 {
1197 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1198 }
1199
1200 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1201 unsigned int family, int reverse);
1202
1203 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1204 unsigned int family)
1205 {
1206 return __xfrm_decode_session(skb, fl, family, 0);
1207 }
1208
1209 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1210 struct flowi *fl,
1211 unsigned int family)
1212 {
1213 return __xfrm_decode_session(skb, fl, family, 1);
1214 }
1215
1216 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1217
1218 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1219 {
1220 struct net *net = dev_net(skb->dev);
1221
1222 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1223 (skb_dst(skb)->flags & DST_NOXFRM) ||
1224 __xfrm_route_forward(skb, family);
1225 }
1226
1227 static inline int xfrm4_route_forward(struct sk_buff *skb)
1228 {
1229 return xfrm_route_forward(skb, AF_INET);
1230 }
1231
1232 static inline int xfrm6_route_forward(struct sk_buff *skb)
1233 {
1234 return xfrm_route_forward(skb, AF_INET6);
1235 }
1236
1237 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1238
1239 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1240 {
1241 sk->sk_policy[0] = NULL;
1242 sk->sk_policy[1] = NULL;
1243 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1244 return __xfrm_sk_clone_policy(sk, osk);
1245 return 0;
1246 }
1247
1248 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1249
1250 static inline void xfrm_sk_free_policy(struct sock *sk)
1251 {
1252 struct xfrm_policy *pol;
1253
1254 pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1255 if (unlikely(pol != NULL)) {
1256 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1257 sk->sk_policy[0] = NULL;
1258 }
1259 pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1260 if (unlikely(pol != NULL)) {
1261 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1262 sk->sk_policy[1] = NULL;
1263 }
1264 }
1265
1266 #else
1267
1268 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1269 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1270 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1271 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1272 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1273 {
1274 return 1;
1275 }
1276 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1277 {
1278 return 1;
1279 }
1280 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1281 {
1282 return 1;
1283 }
1284 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1285 struct flowi *fl,
1286 unsigned int family)
1287 {
1288 return -ENOSYS;
1289 }
1290 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1291 struct sk_buff *skb)
1292 {
1293 return 1;
1294 }
1295 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1296 struct sk_buff *skb)
1297 {
1298 return 1;
1299 }
1300 #endif
1301
1302 static __inline__
1303 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1304 {
1305 switch (family){
1306 case AF_INET:
1307 return (xfrm_address_t *)&fl->u.ip4.daddr;
1308 case AF_INET6:
1309 return (xfrm_address_t *)&fl->u.ip6.daddr;
1310 }
1311 return NULL;
1312 }
1313
1314 static __inline__
1315 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1316 {
1317 switch (family){
1318 case AF_INET:
1319 return (xfrm_address_t *)&fl->u.ip4.saddr;
1320 case AF_INET6:
1321 return (xfrm_address_t *)&fl->u.ip6.saddr;
1322 }
1323 return NULL;
1324 }
1325
1326 static __inline__
1327 void xfrm_flowi_addr_get(const struct flowi *fl,
1328 xfrm_address_t *saddr, xfrm_address_t *daddr,
1329 unsigned short family)
1330 {
1331 switch(family) {
1332 case AF_INET:
1333 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1334 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1335 break;
1336 case AF_INET6:
1337 saddr->in6 = fl->u.ip6.saddr;
1338 daddr->in6 = fl->u.ip6.daddr;
1339 break;
1340 }
1341 }
1342
1343 static __inline__ int
1344 __xfrm4_state_addr_check(const struct xfrm_state *x,
1345 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1346 {
1347 if (daddr->a4 == x->id.daddr.a4 &&
1348 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1349 return 1;
1350 return 0;
1351 }
1352
1353 static __inline__ int
1354 __xfrm6_state_addr_check(const struct xfrm_state *x,
1355 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1356 {
1357 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1358 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1359 ipv6_addr_any((struct in6_addr *)saddr) ||
1360 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1361 return 1;
1362 return 0;
1363 }
1364
1365 static __inline__ int
1366 xfrm_state_addr_check(const struct xfrm_state *x,
1367 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1368 unsigned short family)
1369 {
1370 switch (family) {
1371 case AF_INET:
1372 return __xfrm4_state_addr_check(x, daddr, saddr);
1373 case AF_INET6:
1374 return __xfrm6_state_addr_check(x, daddr, saddr);
1375 }
1376 return 0;
1377 }
1378
1379 static __inline__ int
1380 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1381 unsigned short family)
1382 {
1383 switch (family) {
1384 case AF_INET:
1385 return __xfrm4_state_addr_check(x,
1386 (const xfrm_address_t *)&fl->u.ip4.daddr,
1387 (const xfrm_address_t *)&fl->u.ip4.saddr);
1388 case AF_INET6:
1389 return __xfrm6_state_addr_check(x,
1390 (const xfrm_address_t *)&fl->u.ip6.daddr,
1391 (const xfrm_address_t *)&fl->u.ip6.saddr);
1392 }
1393 return 0;
1394 }
1395
1396 static inline int xfrm_state_kern(const struct xfrm_state *x)
1397 {
1398 return atomic_read(&x->tunnel_users);
1399 }
1400
1401 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1402 {
1403 return (!userproto || proto == userproto ||
1404 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1405 proto == IPPROTO_ESP ||
1406 proto == IPPROTO_COMP)));
1407 }
1408
1409 /*
1410 * xfrm algorithm information
1411 */
1412 struct xfrm_algo_aead_info {
1413 char *geniv;
1414 u16 icv_truncbits;
1415 };
1416
1417 struct xfrm_algo_auth_info {
1418 u16 icv_truncbits;
1419 u16 icv_fullbits;
1420 };
1421
1422 struct xfrm_algo_encr_info {
1423 char *geniv;
1424 u16 blockbits;
1425 u16 defkeybits;
1426 };
1427
1428 struct xfrm_algo_comp_info {
1429 u16 threshold;
1430 };
1431
1432 struct xfrm_algo_desc {
1433 char *name;
1434 char *compat;
1435 u8 available:1;
1436 u8 pfkey_supported:1;
1437 union {
1438 struct xfrm_algo_aead_info aead;
1439 struct xfrm_algo_auth_info auth;
1440 struct xfrm_algo_encr_info encr;
1441 struct xfrm_algo_comp_info comp;
1442 } uinfo;
1443 struct sadb_alg desc;
1444 };
1445
1446 /* XFRM protocol handlers. */
1447 struct xfrm4_protocol {
1448 int (*handler)(struct sk_buff *skb);
1449 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1450 int encap_type);
1451 int (*cb_handler)(struct sk_buff *skb, int err);
1452 int (*err_handler)(struct sk_buff *skb, u32 info);
1453
1454 struct xfrm4_protocol __rcu *next;
1455 int priority;
1456 };
1457
1458 struct xfrm6_protocol {
1459 int (*handler)(struct sk_buff *skb);
1460 int (*cb_handler)(struct sk_buff *skb, int err);
1461 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1462 u8 type, u8 code, int offset, __be32 info);
1463
1464 struct xfrm6_protocol __rcu *next;
1465 int priority;
1466 };
1467
1468 /* XFRM tunnel handlers. */
1469 struct xfrm_tunnel {
1470 int (*handler)(struct sk_buff *skb);
1471 int (*err_handler)(struct sk_buff *skb, u32 info);
1472
1473 struct xfrm_tunnel __rcu *next;
1474 int priority;
1475 };
1476
1477 struct xfrm6_tunnel {
1478 int (*handler)(struct sk_buff *skb);
1479 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1480 u8 type, u8 code, int offset, __be32 info);
1481 struct xfrm6_tunnel __rcu *next;
1482 int priority;
1483 };
1484
1485 void xfrm_init(void);
1486 void xfrm4_init(void);
1487 int xfrm_state_init(struct net *net);
1488 void xfrm_state_fini(struct net *net);
1489 void xfrm4_state_init(void);
1490 void xfrm4_protocol_init(void);
1491 #ifdef CONFIG_XFRM
1492 int xfrm6_init(void);
1493 void xfrm6_fini(void);
1494 int xfrm6_state_init(void);
1495 void xfrm6_state_fini(void);
1496 int xfrm6_protocol_init(void);
1497 void xfrm6_protocol_fini(void);
1498 #else
1499 static inline int xfrm6_init(void)
1500 {
1501 return 0;
1502 }
1503 static inline void xfrm6_fini(void)
1504 {
1505 ;
1506 }
1507 #endif
1508
1509 #ifdef CONFIG_XFRM_STATISTICS
1510 int xfrm_proc_init(struct net *net);
1511 void xfrm_proc_fini(struct net *net);
1512 #endif
1513
1514 int xfrm_sysctl_init(struct net *net);
1515 #ifdef CONFIG_SYSCTL
1516 void xfrm_sysctl_fini(struct net *net);
1517 #else
1518 static inline void xfrm_sysctl_fini(struct net *net)
1519 {
1520 }
1521 #endif
1522
1523 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1524 struct xfrm_address_filter *filter);
1525 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1526 int (*func)(struct xfrm_state *, int, void*), void *);
1527 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1528 struct xfrm_state *xfrm_state_alloc(struct net *net);
1529 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1530 const xfrm_address_t *saddr,
1531 const struct flowi *fl,
1532 struct xfrm_tmpl *tmpl,
1533 struct xfrm_policy *pol, int *err,
1534 unsigned short family);
1535 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1536 xfrm_address_t *daddr,
1537 xfrm_address_t *saddr,
1538 unsigned short family,
1539 u8 mode, u8 proto, u32 reqid);
1540 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1541 unsigned short family);
1542 int xfrm_state_check_expire(struct xfrm_state *x);
1543 void xfrm_state_insert(struct xfrm_state *x);
1544 int xfrm_state_add(struct xfrm_state *x);
1545 int xfrm_state_update(struct xfrm_state *x);
1546 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1547 const xfrm_address_t *daddr, __be32 spi,
1548 u8 proto, unsigned short family);
1549 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1550 const xfrm_address_t *daddr,
1551 const xfrm_address_t *saddr,
1552 u8 proto,
1553 unsigned short family);
1554 #ifdef CONFIG_XFRM_SUB_POLICY
1555 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1556 unsigned short family, struct net *net);
1557 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1558 unsigned short family);
1559 #else
1560 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1561 int n, unsigned short family, struct net *net)
1562 {
1563 return -ENOSYS;
1564 }
1565
1566 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1567 int n, unsigned short family)
1568 {
1569 return -ENOSYS;
1570 }
1571 #endif
1572
1573 struct xfrmk_sadinfo {
1574 u32 sadhcnt; /* current hash bkts */
1575 u32 sadhmcnt; /* max allowed hash bkts */
1576 u32 sadcnt; /* current running count */
1577 };
1578
1579 struct xfrmk_spdinfo {
1580 u32 incnt;
1581 u32 outcnt;
1582 u32 fwdcnt;
1583 u32 inscnt;
1584 u32 outscnt;
1585 u32 fwdscnt;
1586 u32 spdhcnt;
1587 u32 spdhmcnt;
1588 };
1589
1590 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1591 int xfrm_state_delete(struct xfrm_state *x);
1592 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1593 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1594 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1595 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1596 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1597 int xfrm_init_replay(struct xfrm_state *x);
1598 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1599 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1600 int xfrm_init_state(struct xfrm_state *x);
1601 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1602 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1603 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1604 int xfrm_trans_queue(struct sk_buff *skb,
1605 int (*finish)(struct net *, struct sock *,
1606 struct sk_buff *));
1607 int xfrm_output_resume(struct sk_buff *skb, int err);
1608 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1609 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1610 void xfrm_local_error(struct sk_buff *skb, int mtu);
1611 int xfrm4_extract_header(struct sk_buff *skb);
1612 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1613 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1614 int encap_type);
1615 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1616 int xfrm4_rcv(struct sk_buff *skb);
1617 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1618
1619 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1620 {
1621 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1622 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1623 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1624 return xfrm_input(skb, nexthdr, spi, 0);
1625 }
1626
1627 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1628 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1629 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1630 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1631 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1632 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1633 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1634 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1635 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1636 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1637 int xfrm6_extract_header(struct sk_buff *skb);
1638 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1639 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1640 struct ip6_tnl *t);
1641 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1642 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1643 int xfrm6_rcv(struct sk_buff *skb);
1644 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1645 xfrm_address_t *saddr, u8 proto);
1646 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1647 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1648 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1649 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1650 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1651 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1652 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1653 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1654 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1655 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1656 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1657 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1658 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1659 u8 **prevhdr);
1660
1661 #ifdef CONFIG_XFRM
1662 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1663 int xfrm_user_policy(struct sock *sk, int optname,
1664 u8 __user *optval, int optlen);
1665 #else
1666 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1667 {
1668 return -ENOPROTOOPT;
1669 }
1670
1671 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1672 {
1673 /* should not happen */
1674 kfree_skb(skb);
1675 return 0;
1676 }
1677 #endif
1678
1679 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1680 const xfrm_address_t *saddr,
1681 const xfrm_address_t *daddr,
1682 int family, u32 mark);
1683
1684 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1685
1686 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1687 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1688 int (*func)(struct xfrm_policy *, int, int, void*),
1689 void *);
1690 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1691 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1692 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1693 u8 type, int dir,
1694 struct xfrm_selector *sel,
1695 struct xfrm_sec_ctx *ctx, int delete,
1696 int *err);
1697 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1698 u32 id, int delete, int *err);
1699 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1700 void xfrm_policy_hash_rebuild(struct net *net);
1701 u32 xfrm_get_acqseq(void);
1702 int verify_spi_info(u8 proto, u32 min, u32 max);
1703 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1704 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1705 u8 mode, u32 reqid, u8 proto,
1706 const xfrm_address_t *daddr,
1707 const xfrm_address_t *saddr, int create,
1708 unsigned short family);
1709 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1710
1711 #ifdef CONFIG_XFRM_MIGRATE
1712 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1713 const struct xfrm_migrate *m, int num_bundles,
1714 const struct xfrm_kmaddress *k,
1715 const struct xfrm_encap_tmpl *encap);
1716 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1717 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1718 struct xfrm_migrate *m,
1719 struct xfrm_encap_tmpl *encap);
1720 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1721 struct xfrm_migrate *m, int num_bundles,
1722 struct xfrm_kmaddress *k, struct net *net,
1723 struct xfrm_encap_tmpl *encap);
1724 #endif
1725
1726 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1727 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1728 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1729 xfrm_address_t *addr);
1730
1731 void xfrm_input_init(void);
1732 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1733
1734 void xfrm_probe_algs(void);
1735 int xfrm_count_pfkey_auth_supported(void);
1736 int xfrm_count_pfkey_enc_supported(void);
1737 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1738 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1739 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1740 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1741 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1742 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1743 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1744 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1745 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1746 int probe);
1747
1748 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1749 const xfrm_address_t *b)
1750 {
1751 return ipv6_addr_equal((const struct in6_addr *)a,
1752 (const struct in6_addr *)b);
1753 }
1754
1755 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1756 const xfrm_address_t *b,
1757 sa_family_t family)
1758 {
1759 switch (family) {
1760 default:
1761 case AF_INET:
1762 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1763 case AF_INET6:
1764 return xfrm6_addr_equal(a, b);
1765 }
1766 }
1767
1768 static inline int xfrm_policy_id2dir(u32 index)
1769 {
1770 return index & 7;
1771 }
1772
1773 #ifdef CONFIG_XFRM
1774 static inline int xfrm_aevent_is_on(struct net *net)
1775 {
1776 struct sock *nlsk;
1777 int ret = 0;
1778
1779 rcu_read_lock();
1780 nlsk = rcu_dereference(net->xfrm.nlsk);
1781 if (nlsk)
1782 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1783 rcu_read_unlock();
1784 return ret;
1785 }
1786
1787 static inline int xfrm_acquire_is_on(struct net *net)
1788 {
1789 struct sock *nlsk;
1790 int ret = 0;
1791
1792 rcu_read_lock();
1793 nlsk = rcu_dereference(net->xfrm.nlsk);
1794 if (nlsk)
1795 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1796 rcu_read_unlock();
1797
1798 return ret;
1799 }
1800 #endif
1801
1802 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1803 {
1804 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1805 }
1806
1807 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1808 {
1809 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1810 }
1811
1812 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1813 {
1814 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1815 }
1816
1817 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1818 {
1819 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1820 }
1821
1822 #ifdef CONFIG_XFRM_MIGRATE
1823 static inline int xfrm_replay_clone(struct xfrm_state *x,
1824 struct xfrm_state *orig)
1825 {
1826 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1827 GFP_KERNEL);
1828 if (!x->replay_esn)
1829 return -ENOMEM;
1830
1831 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1832 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1833
1834 x->preplay_esn = kmemdup(x->replay_esn,
1835 xfrm_replay_state_esn_len(x->replay_esn),
1836 GFP_KERNEL);
1837 if (!x->preplay_esn) {
1838 kfree(x->replay_esn);
1839 return -ENOMEM;
1840 }
1841
1842 return 0;
1843 }
1844
1845 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1846 {
1847 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1848 }
1849
1850
1851 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1852 {
1853 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1854 }
1855
1856 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1857 {
1858 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1859 }
1860
1861 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1862 {
1863 int i;
1864 for (i = 0; i < n; i++)
1865 xfrm_state_put(*(states + i));
1866 }
1867
1868 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1869 {
1870 int i;
1871 for (i = 0; i < n; i++)
1872 xfrm_state_delete(*(states + i));
1873 }
1874 #endif
1875
1876 #ifdef CONFIG_XFRM
1877 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1878 {
1879 return skb->sp->xvec[skb->sp->len - 1];
1880 }
1881 #endif
1882
1883 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1884 {
1885 #ifdef CONFIG_XFRM
1886 struct sec_path *sp = skb->sp;
1887
1888 if (!sp || !sp->olen || sp->len != sp->olen)
1889 return NULL;
1890
1891 return &sp->ovec[sp->olen - 1];
1892 #else
1893 return NULL;
1894 #endif
1895 }
1896
1897 void __net_init xfrm_dev_init(void);
1898
1899 #ifdef CONFIG_XFRM_OFFLOAD
1900 void xfrm_dev_resume(struct sk_buff *skb);
1901 void xfrm_dev_backlog(struct softnet_data *sd);
1902 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1903 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1904 struct xfrm_user_offload *xuo);
1905 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1906
1907 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1908 {
1909 struct xfrm_state_offload *xso = &x->xso;
1910
1911 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1912 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1913 }
1914
1915 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1916 {
1917 struct xfrm_state *x = dst->xfrm;
1918 struct xfrm_dst *xdst;
1919
1920 if (!x || !x->type_offload)
1921 return false;
1922
1923 xdst = (struct xfrm_dst *) dst;
1924 if (!x->xso.offload_handle && !xdst->child->xfrm)
1925 return true;
1926 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1927 !xdst->child->xfrm)
1928 return true;
1929
1930 return false;
1931 }
1932
1933 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1934 {
1935 struct xfrm_state_offload *xso = &x->xso;
1936
1937 if (xso->dev)
1938 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1939 }
1940
1941 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1942 {
1943 struct xfrm_state_offload *xso = &x->xso;
1944 struct net_device *dev = xso->dev;
1945
1946 if (dev && dev->xfrmdev_ops) {
1947 if (dev->xfrmdev_ops->xdo_dev_state_free)
1948 dev->xfrmdev_ops->xdo_dev_state_free(x);
1949 xso->dev = NULL;
1950 dev_put(dev);
1951 }
1952 }
1953 #else
1954 static inline void xfrm_dev_resume(struct sk_buff *skb)
1955 {
1956 }
1957
1958 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1959 {
1960 }
1961
1962 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1963 {
1964 return skb;
1965 }
1966
1967 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1968 {
1969 return 0;
1970 }
1971
1972 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1973 {
1974 }
1975
1976 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1977 {
1978 }
1979
1980 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1981 {
1982 return false;
1983 }
1984
1985 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1986 {
1987 }
1988
1989 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1990 {
1991 return false;
1992 }
1993 #endif
1994
1995 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1996 {
1997 if (attrs[XFRMA_MARK])
1998 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1999 else
2000 m->v = m->m = 0;
2001
2002 return m->v & m->m;
2003 }
2004
2005 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2006 {
2007 int ret = 0;
2008
2009 if (m->m | m->v)
2010 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2011 return ret;
2012 }
2013
2014 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2015 unsigned int family)
2016 {
2017 bool tunnel = false;
2018
2019 switch(family) {
2020 case AF_INET:
2021 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2022 tunnel = true;
2023 break;
2024 case AF_INET6:
2025 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2026 tunnel = true;
2027 break;
2028 }
2029 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2030 return -EINVAL;
2031
2032 return 0;
2033 }
2034 #endif /* _NET_XFRM_H */
CRIS linux kernel tree