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pinctrl: UniPhier: add UniPhier PH1-Pro4 pinctrl driver
[linux-2.6/btrfs-unstable.git] / include / net / xfrm.h
blobf0ee97eec24d28625d9c3f714ab18a72b0b8f125
1 #ifndef _NET_XFRM_H
2 #define _NET_XFRM_H
3
4 #include <linux/compiler.h>
5 #include <linux/xfrm.h>
6 #include <linux/spinlock.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9 #include <linux/socket.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/ipsec.h>
12 #include <linux/in6.h>
13 #include <linux/mutex.h>
14 #include <linux/audit.h>
15 #include <linux/slab.h>
16
17 #include <net/sock.h>
18 #include <net/dst.h>
19 #include <net/ip.h>
20 #include <net/route.h>
21 #include <net/ipv6.h>
22 #include <net/ip6_fib.h>
23 #include <net/flow.h>
24
25 #include <linux/interrupt.h>
26
27 #ifdef CONFIG_XFRM_STATISTICS
28 #include <net/snmp.h>
29 #endif
30
31 #define XFRM_PROTO_ESP 50
32 #define XFRM_PROTO_AH 51
33 #define XFRM_PROTO_COMP 108
34 #define XFRM_PROTO_IPIP 4
35 #define XFRM_PROTO_IPV6 41
36 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
37 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
38
39 #define XFRM_ALIGN4(len) (((len) + 3) & ~3)
40 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
41 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
43 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
45
46 #ifdef CONFIG_XFRM_STATISTICS
47 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
48 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
49 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
50 #else
51 #define XFRM_INC_STATS(net, field) ((void)(net))
52 #define XFRM_INC_STATS_BH(net, field) ((void)(net))
53 #define XFRM_INC_STATS_USER(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 /* Full description of state of transformer. */
128 struct xfrm_state {
129 possible_net_t xs_net;
130 union {
131 struct hlist_node gclist;
132 struct hlist_node bydst;
133 };
134 struct hlist_node bysrc;
135 struct hlist_node byspi;
136
137 atomic_t refcnt;
138 spinlock_t lock;
139
140 struct xfrm_id id;
141 struct xfrm_selector sel;
142 struct xfrm_mark mark;
143 u32 tfcpad;
144
145 u32 genid;
146
147 /* Key manager bits */
148 struct xfrm_state_walk km;
149
150 /* Parameters of this state. */
151 struct {
152 u32 reqid;
153 u8 mode;
154 u8 replay_window;
155 u8 aalgo, ealgo, calgo;
156 u8 flags;
157 u16 family;
158 xfrm_address_t saddr;
159 int header_len;
160 int trailer_len;
161 u32 extra_flags;
162 } props;
163
164 struct xfrm_lifetime_cfg lft;
165
166 /* Data for transformer */
167 struct xfrm_algo_auth *aalg;
168 struct xfrm_algo *ealg;
169 struct xfrm_algo *calg;
170 struct xfrm_algo_aead *aead;
171 const char *geniv;
172
173 /* Data for encapsulator */
174 struct xfrm_encap_tmpl *encap;
175
176 /* Data for care-of address */
177 xfrm_address_t *coaddr;
178
179 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
180 struct xfrm_state *tunnel;
181
182 /* If a tunnel, number of users + 1 */
183 atomic_t tunnel_users;
184
185 /* State for replay detection */
186 struct xfrm_replay_state replay;
187 struct xfrm_replay_state_esn *replay_esn;
188
189 /* Replay detection state at the time we sent the last notification */
190 struct xfrm_replay_state preplay;
191 struct xfrm_replay_state_esn *preplay_esn;
192
193 /* The functions for replay detection. */
194 struct xfrm_replay *repl;
195
196 /* internal flag that only holds state for delayed aevent at the
197 * moment
198 */
199 u32 xflags;
200
201 /* Replay detection notification settings */
202 u32 replay_maxage;
203 u32 replay_maxdiff;
204
205 /* Replay detection notification timer */
206 struct timer_list rtimer;
207
208 /* Statistics */
209 struct xfrm_stats stats;
210
211 struct xfrm_lifetime_cur curlft;
212 struct tasklet_hrtimer mtimer;
213
214 /* used to fix curlft->add_time when changing date */
215 long saved_tmo;
216
217 /* Last used time */
218 unsigned long lastused;
219
220 /* Reference to data common to all the instances of this
221 * transformer. */
222 const struct xfrm_type *type;
223 struct xfrm_mode *inner_mode;
224 struct xfrm_mode *inner_mode_iaf;
225 struct xfrm_mode *outer_mode;
226
227 /* Security context */
228 struct xfrm_sec_ctx *security;
229
230 /* Private data of this transformer, format is opaque,
231 * interpreted by xfrm_type methods. */
232 void *data;
233 };
234
235 static inline struct net *xs_net(struct xfrm_state *x)
236 {
237 return read_pnet(&x->xs_net);
238 }
239
240 /* xflags - make enum if more show up */
241 #define XFRM_TIME_DEFER 1
242 #define XFRM_SOFT_EXPIRE 2
243
244 enum {
245 XFRM_STATE_VOID,
246 XFRM_STATE_ACQ,
247 XFRM_STATE_VALID,
248 XFRM_STATE_ERROR,
249 XFRM_STATE_EXPIRED,
250 XFRM_STATE_DEAD
251 };
252
253 /* callback structure passed from either netlink or pfkey */
254 struct km_event {
255 union {
256 u32 hard;
257 u32 proto;
258 u32 byid;
259 u32 aevent;
260 u32 type;
261 } data;
262
263 u32 seq;
264 u32 portid;
265 u32 event;
266 struct net *net;
267 };
268
269 struct xfrm_replay {
270 void (*advance)(struct xfrm_state *x, __be32 net_seq);
271 int (*check)(struct xfrm_state *x,
272 struct sk_buff *skb,
273 __be32 net_seq);
274 int (*recheck)(struct xfrm_state *x,
275 struct sk_buff *skb,
276 __be32 net_seq);
277 void (*notify)(struct xfrm_state *x, int event);
278 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
279 };
280
281 struct net_device;
282 struct xfrm_type;
283 struct xfrm_dst;
284 struct xfrm_policy_afinfo {
285 unsigned short family;
286 struct dst_ops *dst_ops;
287 void (*garbage_collect)(struct net *net);
288 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
289 const xfrm_address_t *saddr,
290 const xfrm_address_t *daddr);
291 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
292 void (*decode_session)(struct sk_buff *skb,
293 struct flowi *fl,
294 int reverse);
295 int (*get_tos)(const struct flowi *fl);
296 void (*init_dst)(struct net *net,
297 struct xfrm_dst *dst);
298 int (*init_path)(struct xfrm_dst *path,
299 struct dst_entry *dst,
300 int nfheader_len);
301 int (*fill_dst)(struct xfrm_dst *xdst,
302 struct net_device *dev,
303 const struct flowi *fl);
304 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
305 };
306
307 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
308 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
309 void km_policy_notify(struct xfrm_policy *xp, int dir,
310 const struct km_event *c);
311 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
312
313 struct xfrm_tmpl;
314 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
315 struct xfrm_policy *pol);
316 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
317 int __xfrm_state_delete(struct xfrm_state *x);
318
319 struct xfrm_state_afinfo {
320 unsigned int family;
321 unsigned int proto;
322 __be16 eth_proto;
323 struct module *owner;
324 const struct xfrm_type *type_map[IPPROTO_MAX];
325 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
326 int (*init_flags)(struct xfrm_state *x);
327 void (*init_tempsel)(struct xfrm_selector *sel,
328 const struct flowi *fl);
329 void (*init_temprop)(struct xfrm_state *x,
330 const struct xfrm_tmpl *tmpl,
331 const xfrm_address_t *daddr,
332 const xfrm_address_t *saddr);
333 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
334 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
335 int (*output)(struct sock *sk, struct sk_buff *skb);
336 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
337 int (*extract_input)(struct xfrm_state *x,
338 struct sk_buff *skb);
339 int (*extract_output)(struct xfrm_state *x,
340 struct sk_buff *skb);
341 int (*transport_finish)(struct sk_buff *skb,
342 int async);
343 void (*local_error)(struct sk_buff *skb, u32 mtu);
344 };
345
346 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
347 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
348 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
349 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
350
351 struct xfrm_input_afinfo {
352 unsigned int family;
353 struct module *owner;
354 int (*callback)(struct sk_buff *skb, u8 protocol,
355 int err);
356 };
357
358 int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo);
359 int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo);
360
361 void xfrm_state_delete_tunnel(struct xfrm_state *x);
362
363 struct xfrm_type {
364 char *description;
365 struct module *owner;
366 u8 proto;
367 u8 flags;
368 #define XFRM_TYPE_NON_FRAGMENT 1
369 #define XFRM_TYPE_REPLAY_PROT 2
370 #define XFRM_TYPE_LOCAL_COADDR 4
371 #define XFRM_TYPE_REMOTE_COADDR 8
372
373 int (*init_state)(struct xfrm_state *x);
374 void (*destructor)(struct xfrm_state *);
375 int (*input)(struct xfrm_state *, struct sk_buff *skb);
376 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
377 int (*reject)(struct xfrm_state *, struct sk_buff *,
378 const struct flowi *);
379 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
380 /* Estimate maximal size of result of transformation of a dgram */
381 u32 (*get_mtu)(struct xfrm_state *, int size);
382 };
383
384 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
385 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
386
387 struct xfrm_mode {
388 /*
389 * Remove encapsulation header.
390 *
391 * The IP header will be moved over the top of the encapsulation
392 * header.
393 *
394 * On entry, the transport header shall point to where the IP header
395 * should be and the network header shall be set to where the IP
396 * header currently is. skb->data shall point to the start of the
397 * payload.
398 */
399 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
400
401 /*
402 * This is the actual input entry point.
403 *
404 * For transport mode and equivalent this would be identical to
405 * input2 (which does not need to be set). While tunnel mode
406 * and equivalent would set this to the tunnel encapsulation function
407 * xfrm4_prepare_input that would in turn call input2.
408 */
409 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
410
411 /*
412 * Add encapsulation header.
413 *
414 * On exit, the transport header will be set to the start of the
415 * encapsulation header to be filled in by x->type->output and
416 * the mac header will be set to the nextheader (protocol for
417 * IPv4) field of the extension header directly preceding the
418 * encapsulation header, or in its absence, that of the top IP
419 * header. The value of the network header will always point
420 * to the top IP header while skb->data will point to the payload.
421 */
422 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
423
424 /*
425 * This is the actual output entry point.
426 *
427 * For transport mode and equivalent this would be identical to
428 * output2 (which does not need to be set). While tunnel mode
429 * and equivalent would set this to a tunnel encapsulation function
430 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
431 * call output2.
432 */
433 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
434
435 struct xfrm_state_afinfo *afinfo;
436 struct module *owner;
437 unsigned int encap;
438 int flags;
439 };
440
441 /* Flags for xfrm_mode. */
442 enum {
443 XFRM_MODE_FLAG_TUNNEL = 1,
444 };
445
446 int xfrm_register_mode(struct xfrm_mode *mode, int family);
447 int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
448
449 static inline int xfrm_af2proto(unsigned int family)
450 {
451 switch(family) {
452 case AF_INET:
453 return IPPROTO_IPIP;
454 case AF_INET6:
455 return IPPROTO_IPV6;
456 default:
457 return 0;
458 }
459 }
460
461 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
462 {
463 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
464 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
465 return x->inner_mode;
466 else
467 return x->inner_mode_iaf;
468 }
469
470 struct xfrm_tmpl {
471 /* id in template is interpreted as:
472 * daddr - destination of tunnel, may be zero for transport mode.
473 * spi - zero to acquire spi. Not zero if spi is static, then
474 * daddr must be fixed too.
475 * proto - AH/ESP/IPCOMP
476 */
477 struct xfrm_id id;
478
479 /* Source address of tunnel. Ignored, if it is not a tunnel. */
480 xfrm_address_t saddr;
481
482 unsigned short encap_family;
483
484 u32 reqid;
485
486 /* Mode: transport, tunnel etc. */
487 u8 mode;
488
489 /* Sharing mode: unique, this session only, this user only etc. */
490 u8 share;
491
492 /* May skip this transfomration if no SA is found */
493 u8 optional;
494
495 /* Skip aalgos/ealgos/calgos checks. */
496 u8 allalgs;
497
498 /* Bit mask of algos allowed for acquisition */
499 u32 aalgos;
500 u32 ealgos;
501 u32 calgos;
502 };
503
504 #define XFRM_MAX_DEPTH 6
505
506 struct xfrm_policy_walk_entry {
507 struct list_head all;
508 u8 dead;
509 };
510
511 struct xfrm_policy_walk {
512 struct xfrm_policy_walk_entry walk;
513 u8 type;
514 u32 seq;
515 };
516
517 struct xfrm_policy_queue {
518 struct sk_buff_head hold_queue;
519 struct timer_list hold_timer;
520 unsigned long timeout;
521 };
522
523 struct xfrm_policy {
524 possible_net_t xp_net;
525 struct hlist_node bydst;
526 struct hlist_node byidx;
527
528 /* This lock only affects elements except for entry. */
529 rwlock_t lock;
530 atomic_t refcnt;
531 struct timer_list timer;
532
533 struct flow_cache_object flo;
534 atomic_t genid;
535 u32 priority;
536 u32 index;
537 struct xfrm_mark mark;
538 struct xfrm_selector selector;
539 struct xfrm_lifetime_cfg lft;
540 struct xfrm_lifetime_cur curlft;
541 struct xfrm_policy_walk_entry walk;
542 struct xfrm_policy_queue polq;
543 u8 type;
544 u8 action;
545 u8 flags;
546 u8 xfrm_nr;
547 u16 family;
548 struct xfrm_sec_ctx *security;
549 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
550 };
551
552 static inline struct net *xp_net(const struct xfrm_policy *xp)
553 {
554 return read_pnet(&xp->xp_net);
555 }
556
557 struct xfrm_kmaddress {
558 xfrm_address_t local;
559 xfrm_address_t remote;
560 u32 reserved;
561 u16 family;
562 };
563
564 struct xfrm_migrate {
565 xfrm_address_t old_daddr;
566 xfrm_address_t old_saddr;
567 xfrm_address_t new_daddr;
568 xfrm_address_t new_saddr;
569 u8 proto;
570 u8 mode;
571 u16 reserved;
572 u32 reqid;
573 u16 old_family;
574 u16 new_family;
575 };
576
577 #define XFRM_KM_TIMEOUT 30
578 /* what happened */
579 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
580 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
581
582 /* default aevent timeout in units of 100ms */
583 #define XFRM_AE_ETIME 10
584 /* Async Event timer multiplier */
585 #define XFRM_AE_ETH_M 10
586 /* default seq threshold size */
587 #define XFRM_AE_SEQT_SIZE 2
588
589 struct xfrm_mgr {
590 struct list_head list;
591 char *id;
592 int (*notify)(struct xfrm_state *x, const struct km_event *c);
593 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
594 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
595 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
596 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
597 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
598 int (*migrate)(const struct xfrm_selector *sel,
599 u8 dir, u8 type,
600 const struct xfrm_migrate *m,
601 int num_bundles,
602 const struct xfrm_kmaddress *k);
603 bool (*is_alive)(const struct km_event *c);
604 };
605
606 int xfrm_register_km(struct xfrm_mgr *km);
607 int xfrm_unregister_km(struct xfrm_mgr *km);
608
609 struct xfrm_tunnel_skb_cb {
610 union {
611 struct inet_skb_parm h4;
612 struct inet6_skb_parm h6;
613 } header;
614
615 union {
616 struct ip_tunnel *ip4;
617 struct ip6_tnl *ip6;
618 } tunnel;
619 };
620
621 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
622
623 /*
624 * This structure is used for the duration where packets are being
625 * transformed by IPsec. As soon as the packet leaves IPsec the
626 * area beyond the generic IP part may be overwritten.
627 */
628 struct xfrm_skb_cb {
629 struct xfrm_tunnel_skb_cb header;
630
631 /* Sequence number for replay protection. */
632 union {
633 struct {
634 __u32 low;
635 __u32 hi;
636 } output;
637 struct {
638 __be32 low;
639 __be32 hi;
640 } input;
641 } seq;
642 };
643
644 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
645
646 /*
647 * This structure is used by the afinfo prepare_input/prepare_output functions
648 * to transmit header information to the mode input/output functions.
649 */
650 struct xfrm_mode_skb_cb {
651 struct xfrm_tunnel_skb_cb header;
652
653 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
654 __be16 id;
655 __be16 frag_off;
656
657 /* IP header length (excluding options or extension headers). */
658 u8 ihl;
659
660 /* TOS for IPv4, class for IPv6. */
661 u8 tos;
662
663 /* TTL for IPv4, hop limitfor IPv6. */
664 u8 ttl;
665
666 /* Protocol for IPv4, NH for IPv6. */
667 u8 protocol;
668
669 /* Option length for IPv4, zero for IPv6. */
670 u8 optlen;
671
672 /* Used by IPv6 only, zero for IPv4. */
673 u8 flow_lbl[3];
674 };
675
676 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
677
678 /*
679 * This structure is used by the input processing to locate the SPI and
680 * related information.
681 */
682 struct xfrm_spi_skb_cb {
683 struct xfrm_tunnel_skb_cb header;
684
685 unsigned int daddroff;
686 unsigned int family;
687 };
688
689 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
690
691 #ifdef CONFIG_AUDITSYSCALL
692 static inline struct audit_buffer *xfrm_audit_start(const char *op)
693 {
694 struct audit_buffer *audit_buf = NULL;
695
696 if (audit_enabled == 0)
697 return NULL;
698 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
699 AUDIT_MAC_IPSEC_EVENT);
700 if (audit_buf == NULL)
701 return NULL;
702 audit_log_format(audit_buf, "op=%s", op);
703 return audit_buf;
704 }
705
706 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
707 struct audit_buffer *audit_buf)
708 {
709 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
710 audit_get_loginuid(current) :
711 INVALID_UID);
712 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
713 (unsigned int) -1;
714
715 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
716 audit_log_task_context(audit_buf);
717 }
718
719 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
720 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
721 bool task_valid);
722 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
723 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
724 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
725 struct sk_buff *skb);
726 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
727 __be32 net_seq);
728 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
729 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
730 __be32 net_seq);
731 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
732 u8 proto);
733 #else
734
735 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
736 bool task_valid)
737 {
738 }
739
740 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
741 bool task_valid)
742 {
743 }
744
745 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
746 bool task_valid)
747 {
748 }
749
750 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
751 bool task_valid)
752 {
753 }
754
755 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
756 struct sk_buff *skb)
757 {
758 }
759
760 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
761 struct sk_buff *skb, __be32 net_seq)
762 {
763 }
764
765 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
766 u16 family)
767 {
768 }
769
770 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
771 __be32 net_spi, __be32 net_seq)
772 {
773 }
774
775 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
776 struct sk_buff *skb, u8 proto)
777 {
778 }
779 #endif /* CONFIG_AUDITSYSCALL */
780
781 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
782 {
783 if (likely(policy != NULL))
784 atomic_inc(&policy->refcnt);
785 }
786
787 void xfrm_policy_destroy(struct xfrm_policy *policy);
788
789 static inline void xfrm_pol_put(struct xfrm_policy *policy)
790 {
791 if (atomic_dec_and_test(&policy->refcnt))
792 xfrm_policy_destroy(policy);
793 }
794
795 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
796 {
797 int i;
798 for (i = npols - 1; i >= 0; --i)
799 xfrm_pol_put(pols[i]);
800 }
801
802 void __xfrm_state_destroy(struct xfrm_state *);
803
804 static inline void __xfrm_state_put(struct xfrm_state *x)
805 {
806 atomic_dec(&x->refcnt);
807 }
808
809 static inline void xfrm_state_put(struct xfrm_state *x)
810 {
811 if (atomic_dec_and_test(&x->refcnt))
812 __xfrm_state_destroy(x);
813 }
814
815 static inline void xfrm_state_hold(struct xfrm_state *x)
816 {
817 atomic_inc(&x->refcnt);
818 }
819
820 static inline bool addr_match(const void *token1, const void *token2,
821 int prefixlen)
822 {
823 const __be32 *a1 = token1;
824 const __be32 *a2 = token2;
825 int pdw;
826 int pbi;
827
828 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
829 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
830
831 if (pdw)
832 if (memcmp(a1, a2, pdw << 2))
833 return false;
834
835 if (pbi) {
836 __be32 mask;
837
838 mask = htonl((0xffffffff) << (32 - pbi));
839
840 if ((a1[pdw] ^ a2[pdw]) & mask)
841 return false;
842 }
843
844 return true;
845 }
846
847 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
848 {
849 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
850 if (prefixlen == 0)
851 return true;
852 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
853 }
854
855 static __inline__
856 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
857 {
858 __be16 port;
859 switch(fl->flowi_proto) {
860 case IPPROTO_TCP:
861 case IPPROTO_UDP:
862 case IPPROTO_UDPLITE:
863 case IPPROTO_SCTP:
864 port = uli->ports.sport;
865 break;
866 case IPPROTO_ICMP:
867 case IPPROTO_ICMPV6:
868 port = htons(uli->icmpt.type);
869 break;
870 case IPPROTO_MH:
871 port = htons(uli->mht.type);
872 break;
873 case IPPROTO_GRE:
874 port = htons(ntohl(uli->gre_key) >> 16);
875 break;
876 default:
877 port = 0; /*XXX*/
878 }
879 return port;
880 }
881
882 static __inline__
883 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
884 {
885 __be16 port;
886 switch(fl->flowi_proto) {
887 case IPPROTO_TCP:
888 case IPPROTO_UDP:
889 case IPPROTO_UDPLITE:
890 case IPPROTO_SCTP:
891 port = uli->ports.dport;
892 break;
893 case IPPROTO_ICMP:
894 case IPPROTO_ICMPV6:
895 port = htons(uli->icmpt.code);
896 break;
897 case IPPROTO_GRE:
898 port = htons(ntohl(uli->gre_key) & 0xffff);
899 break;
900 default:
901 port = 0; /*XXX*/
902 }
903 return port;
904 }
905
906 bool xfrm_selector_match(const struct xfrm_selector *sel,
907 const struct flowi *fl, unsigned short family);
908
909 #ifdef CONFIG_SECURITY_NETWORK_XFRM
910 /* If neither has a context --> match
911 * Otherwise, both must have a context and the sids, doi, alg must match
912 */
913 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
914 {
915 return ((!s1 && !s2) ||
916 (s1 && s2 &&
917 (s1->ctx_sid == s2->ctx_sid) &&
918 (s1->ctx_doi == s2->ctx_doi) &&
919 (s1->ctx_alg == s2->ctx_alg)));
920 }
921 #else
922 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
923 {
924 return true;
925 }
926 #endif
927
928 /* A struct encoding bundle of transformations to apply to some set of flow.
929 *
930 * dst->child points to the next element of bundle.
931 * dst->xfrm points to an instanse of transformer.
932 *
933 * Due to unfortunate limitations of current routing cache, which we
934 * have no time to fix, it mirrors struct rtable and bound to the same
935 * routing key, including saddr,daddr. However, we can have many of
936 * bundles differing by session id. All the bundles grow from a parent
937 * policy rule.
938 */
939 struct xfrm_dst {
940 union {
941 struct dst_entry dst;
942 struct rtable rt;
943 struct rt6_info rt6;
944 } u;
945 struct dst_entry *route;
946 struct flow_cache_object flo;
947 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
948 int num_pols, num_xfrms;
949 #ifdef CONFIG_XFRM_SUB_POLICY
950 struct flowi *origin;
951 struct xfrm_selector *partner;
952 #endif
953 u32 xfrm_genid;
954 u32 policy_genid;
955 u32 route_mtu_cached;
956 u32 child_mtu_cached;
957 u32 route_cookie;
958 u32 path_cookie;
959 };
960
961 #ifdef CONFIG_XFRM
962 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
963 {
964 xfrm_pols_put(xdst->pols, xdst->num_pols);
965 dst_release(xdst->route);
966 if (likely(xdst->u.dst.xfrm))
967 xfrm_state_put(xdst->u.dst.xfrm);
968 #ifdef CONFIG_XFRM_SUB_POLICY
969 kfree(xdst->origin);
970 xdst->origin = NULL;
971 kfree(xdst->partner);
972 xdst->partner = NULL;
973 #endif
974 }
975 #endif
976
977 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
978
979 struct sec_path {
980 atomic_t refcnt;
981 int len;
982 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
983 };
984
985 static inline int secpath_exists(struct sk_buff *skb)
986 {
987 #ifdef CONFIG_XFRM
988 return skb->sp != NULL;
989 #else
990 return 0;
991 #endif
992 }
993
994 static inline struct sec_path *
995 secpath_get(struct sec_path *sp)
996 {
997 if (sp)
998 atomic_inc(&sp->refcnt);
999 return sp;
1000 }
1001
1002 void __secpath_destroy(struct sec_path *sp);
1003
1004 static inline void
1005 secpath_put(struct sec_path *sp)
1006 {
1007 if (sp && atomic_dec_and_test(&sp->refcnt))
1008 __secpath_destroy(sp);
1009 }
1010
1011 struct sec_path *secpath_dup(struct sec_path *src);
1012
1013 static inline void
1014 secpath_reset(struct sk_buff *skb)
1015 {
1016 #ifdef CONFIG_XFRM
1017 secpath_put(skb->sp);
1018 skb->sp = NULL;
1019 #endif
1020 }
1021
1022 static inline int
1023 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1024 {
1025 switch (family) {
1026 case AF_INET:
1027 return addr->a4 == 0;
1028 case AF_INET6:
1029 return ipv6_addr_any(&addr->in6);
1030 }
1031 return 0;
1032 }
1033
1034 static inline int
1035 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1036 {
1037 return (tmpl->saddr.a4 &&
1038 tmpl->saddr.a4 != x->props.saddr.a4);
1039 }
1040
1041 static inline int
1042 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1043 {
1044 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1045 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1046 }
1047
1048 static inline int
1049 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1050 {
1051 switch (family) {
1052 case AF_INET:
1053 return __xfrm4_state_addr_cmp(tmpl, x);
1054 case AF_INET6:
1055 return __xfrm6_state_addr_cmp(tmpl, x);
1056 }
1057 return !0;
1058 }
1059
1060 #ifdef CONFIG_XFRM
1061 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1062 unsigned short family);
1063
1064 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1065 struct sk_buff *skb,
1066 unsigned int family, int reverse)
1067 {
1068 struct net *net = dev_net(skb->dev);
1069 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1070
1071 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1072 return __xfrm_policy_check(sk, ndir, skb, family);
1073
1074 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1075 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1076 __xfrm_policy_check(sk, ndir, skb, family);
1077 }
1078
1079 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1080 {
1081 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1082 }
1083
1084 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1085 {
1086 return xfrm_policy_check(sk, dir, skb, AF_INET);
1087 }
1088
1089 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1090 {
1091 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1092 }
1093
1094 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1095 struct sk_buff *skb)
1096 {
1097 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1098 }
1099
1100 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1101 struct sk_buff *skb)
1102 {
1103 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1104 }
1105
1106 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1107 unsigned int family, int reverse);
1108
1109 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1110 unsigned int family)
1111 {
1112 return __xfrm_decode_session(skb, fl, family, 0);
1113 }
1114
1115 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1116 struct flowi *fl,
1117 unsigned int family)
1118 {
1119 return __xfrm_decode_session(skb, fl, family, 1);
1120 }
1121
1122 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1123
1124 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1125 {
1126 struct net *net = dev_net(skb->dev);
1127
1128 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1129 (skb_dst(skb)->flags & DST_NOXFRM) ||
1130 __xfrm_route_forward(skb, family);
1131 }
1132
1133 static inline int xfrm4_route_forward(struct sk_buff *skb)
1134 {
1135 return xfrm_route_forward(skb, AF_INET);
1136 }
1137
1138 static inline int xfrm6_route_forward(struct sk_buff *skb)
1139 {
1140 return xfrm_route_forward(skb, AF_INET6);
1141 }
1142
1143 int __xfrm_sk_clone_policy(struct sock *sk);
1144
1145 static inline int xfrm_sk_clone_policy(struct sock *sk)
1146 {
1147 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1148 return __xfrm_sk_clone_policy(sk);
1149 return 0;
1150 }
1151
1152 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1153
1154 static inline void xfrm_sk_free_policy(struct sock *sk)
1155 {
1156 if (unlikely(sk->sk_policy[0] != NULL)) {
1157 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1158 sk->sk_policy[0] = NULL;
1159 }
1160 if (unlikely(sk->sk_policy[1] != NULL)) {
1161 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1162 sk->sk_policy[1] = NULL;
1163 }
1164 }
1165
1166 void xfrm_garbage_collect(struct net *net);
1167
1168 #else
1169
1170 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1171 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1172 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1173 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1174 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1175 {
1176 return 1;
1177 }
1178 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1179 {
1180 return 1;
1181 }
1182 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1183 {
1184 return 1;
1185 }
1186 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1187 struct flowi *fl,
1188 unsigned int family)
1189 {
1190 return -ENOSYS;
1191 }
1192 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1193 struct sk_buff *skb)
1194 {
1195 return 1;
1196 }
1197 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1198 struct sk_buff *skb)
1199 {
1200 return 1;
1201 }
1202 static inline void xfrm_garbage_collect(struct net *net)
1203 {
1204 }
1205 #endif
1206
1207 static __inline__
1208 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1209 {
1210 switch (family){
1211 case AF_INET:
1212 return (xfrm_address_t *)&fl->u.ip4.daddr;
1213 case AF_INET6:
1214 return (xfrm_address_t *)&fl->u.ip6.daddr;
1215 }
1216 return NULL;
1217 }
1218
1219 static __inline__
1220 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1221 {
1222 switch (family){
1223 case AF_INET:
1224 return (xfrm_address_t *)&fl->u.ip4.saddr;
1225 case AF_INET6:
1226 return (xfrm_address_t *)&fl->u.ip6.saddr;
1227 }
1228 return NULL;
1229 }
1230
1231 static __inline__
1232 void xfrm_flowi_addr_get(const struct flowi *fl,
1233 xfrm_address_t *saddr, xfrm_address_t *daddr,
1234 unsigned short family)
1235 {
1236 switch(family) {
1237 case AF_INET:
1238 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1239 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1240 break;
1241 case AF_INET6:
1242 saddr->in6 = fl->u.ip6.saddr;
1243 daddr->in6 = fl->u.ip6.daddr;
1244 break;
1245 }
1246 }
1247
1248 static __inline__ int
1249 __xfrm4_state_addr_check(const struct xfrm_state *x,
1250 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1251 {
1252 if (daddr->a4 == x->id.daddr.a4 &&
1253 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1254 return 1;
1255 return 0;
1256 }
1257
1258 static __inline__ int
1259 __xfrm6_state_addr_check(const struct xfrm_state *x,
1260 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1261 {
1262 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1263 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1264 ipv6_addr_any((struct in6_addr *)saddr) ||
1265 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1266 return 1;
1267 return 0;
1268 }
1269
1270 static __inline__ int
1271 xfrm_state_addr_check(const struct xfrm_state *x,
1272 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1273 unsigned short family)
1274 {
1275 switch (family) {
1276 case AF_INET:
1277 return __xfrm4_state_addr_check(x, daddr, saddr);
1278 case AF_INET6:
1279 return __xfrm6_state_addr_check(x, daddr, saddr);
1280 }
1281 return 0;
1282 }
1283
1284 static __inline__ int
1285 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1286 unsigned short family)
1287 {
1288 switch (family) {
1289 case AF_INET:
1290 return __xfrm4_state_addr_check(x,
1291 (const xfrm_address_t *)&fl->u.ip4.daddr,
1292 (const xfrm_address_t *)&fl->u.ip4.saddr);
1293 case AF_INET6:
1294 return __xfrm6_state_addr_check(x,
1295 (const xfrm_address_t *)&fl->u.ip6.daddr,
1296 (const xfrm_address_t *)&fl->u.ip6.saddr);
1297 }
1298 return 0;
1299 }
1300
1301 static inline int xfrm_state_kern(const struct xfrm_state *x)
1302 {
1303 return atomic_read(&x->tunnel_users);
1304 }
1305
1306 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1307 {
1308 return (!userproto || proto == userproto ||
1309 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1310 proto == IPPROTO_ESP ||
1311 proto == IPPROTO_COMP)));
1312 }
1313
1314 /*
1315 * xfrm algorithm information
1316 */
1317 struct xfrm_algo_aead_info {
1318 char *geniv;
1319 u16 icv_truncbits;
1320 };
1321
1322 struct xfrm_algo_auth_info {
1323 u16 icv_truncbits;
1324 u16 icv_fullbits;
1325 };
1326
1327 struct xfrm_algo_encr_info {
1328 char *geniv;
1329 u16 blockbits;
1330 u16 defkeybits;
1331 };
1332
1333 struct xfrm_algo_comp_info {
1334 u16 threshold;
1335 };
1336
1337 struct xfrm_algo_desc {
1338 char *name;
1339 char *compat;
1340 u8 available:1;
1341 u8 pfkey_supported:1;
1342 union {
1343 struct xfrm_algo_aead_info aead;
1344 struct xfrm_algo_auth_info auth;
1345 struct xfrm_algo_encr_info encr;
1346 struct xfrm_algo_comp_info comp;
1347 } uinfo;
1348 struct sadb_alg desc;
1349 };
1350
1351 /* XFRM protocol handlers. */
1352 struct xfrm4_protocol {
1353 int (*handler)(struct sk_buff *skb);
1354 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1355 int encap_type);
1356 int (*cb_handler)(struct sk_buff *skb, int err);
1357 int (*err_handler)(struct sk_buff *skb, u32 info);
1358
1359 struct xfrm4_protocol __rcu *next;
1360 int priority;
1361 };
1362
1363 struct xfrm6_protocol {
1364 int (*handler)(struct sk_buff *skb);
1365 int (*cb_handler)(struct sk_buff *skb, int err);
1366 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1367 u8 type, u8 code, int offset, __be32 info);
1368
1369 struct xfrm6_protocol __rcu *next;
1370 int priority;
1371 };
1372
1373 /* XFRM tunnel handlers. */
1374 struct xfrm_tunnel {
1375 int (*handler)(struct sk_buff *skb);
1376 int (*err_handler)(struct sk_buff *skb, u32 info);
1377
1378 struct xfrm_tunnel __rcu *next;
1379 int priority;
1380 };
1381
1382 struct xfrm6_tunnel {
1383 int (*handler)(struct sk_buff *skb);
1384 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1385 u8 type, u8 code, int offset, __be32 info);
1386 struct xfrm6_tunnel __rcu *next;
1387 int priority;
1388 };
1389
1390 void xfrm_init(void);
1391 void xfrm4_init(void);
1392 int xfrm_state_init(struct net *net);
1393 void xfrm_state_fini(struct net *net);
1394 void xfrm4_state_init(void);
1395 void xfrm4_protocol_init(void);
1396 #ifdef CONFIG_XFRM
1397 int xfrm6_init(void);
1398 void xfrm6_fini(void);
1399 int xfrm6_state_init(void);
1400 void xfrm6_state_fini(void);
1401 int xfrm6_protocol_init(void);
1402 void xfrm6_protocol_fini(void);
1403 #else
1404 static inline int xfrm6_init(void)
1405 {
1406 return 0;
1407 }
1408 static inline void xfrm6_fini(void)
1409 {
1410 ;
1411 }
1412 #endif
1413
1414 #ifdef CONFIG_XFRM_STATISTICS
1415 int xfrm_proc_init(struct net *net);
1416 void xfrm_proc_fini(struct net *net);
1417 #endif
1418
1419 int xfrm_sysctl_init(struct net *net);
1420 #ifdef CONFIG_SYSCTL
1421 void xfrm_sysctl_fini(struct net *net);
1422 #else
1423 static inline void xfrm_sysctl_fini(struct net *net)
1424 {
1425 }
1426 #endif
1427
1428 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1429 struct xfrm_address_filter *filter);
1430 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1431 int (*func)(struct xfrm_state *, int, void*), void *);
1432 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1433 struct xfrm_state *xfrm_state_alloc(struct net *net);
1434 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1435 const xfrm_address_t *saddr,
1436 const struct flowi *fl,
1437 struct xfrm_tmpl *tmpl,
1438 struct xfrm_policy *pol, int *err,
1439 unsigned short family);
1440 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1441 xfrm_address_t *daddr,
1442 xfrm_address_t *saddr,
1443 unsigned short family,
1444 u8 mode, u8 proto, u32 reqid);
1445 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1446 unsigned short family);
1447 int xfrm_state_check_expire(struct xfrm_state *x);
1448 void xfrm_state_insert(struct xfrm_state *x);
1449 int xfrm_state_add(struct xfrm_state *x);
1450 int xfrm_state_update(struct xfrm_state *x);
1451 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1452 const xfrm_address_t *daddr, __be32 spi,
1453 u8 proto, unsigned short family);
1454 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1455 const xfrm_address_t *daddr,
1456 const xfrm_address_t *saddr,
1457 u8 proto,
1458 unsigned short family);
1459 #ifdef CONFIG_XFRM_SUB_POLICY
1460 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1461 unsigned short family, struct net *net);
1462 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1463 unsigned short family);
1464 #else
1465 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1466 int n, unsigned short family, struct net *net)
1467 {
1468 return -ENOSYS;
1469 }
1470
1471 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1472 int n, unsigned short family)
1473 {
1474 return -ENOSYS;
1475 }
1476 #endif
1477
1478 struct xfrmk_sadinfo {
1479 u32 sadhcnt; /* current hash bkts */
1480 u32 sadhmcnt; /* max allowed hash bkts */
1481 u32 sadcnt; /* current running count */
1482 };
1483
1484 struct xfrmk_spdinfo {
1485 u32 incnt;
1486 u32 outcnt;
1487 u32 fwdcnt;
1488 u32 inscnt;
1489 u32 outscnt;
1490 u32 fwdscnt;
1491 u32 spdhcnt;
1492 u32 spdhmcnt;
1493 };
1494
1495 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1496 int xfrm_state_delete(struct xfrm_state *x);
1497 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1498 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1499 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1500 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1501 int xfrm_init_replay(struct xfrm_state *x);
1502 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1503 int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1504 int xfrm_init_state(struct xfrm_state *x);
1505 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1506 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1507 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1508 int xfrm_output_resume(struct sk_buff *skb, int err);
1509 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1510 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1511 void xfrm_local_error(struct sk_buff *skb, int mtu);
1512 int xfrm4_extract_header(struct sk_buff *skb);
1513 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1514 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1515 int encap_type);
1516 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1517 int xfrm4_rcv(struct sk_buff *skb);
1518
1519 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1520 {
1521 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1522 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1523 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1524 return xfrm_input(skb, nexthdr, spi, 0);
1525 }
1526
1527 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1528 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1529 int xfrm4_output(struct sock *sk, struct sk_buff *skb);
1530 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1531 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1532 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1533 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1534 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1535 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1536 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1537 int xfrm6_extract_header(struct sk_buff *skb);
1538 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1539 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1540 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1541 int xfrm6_rcv(struct sk_buff *skb);
1542 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1543 xfrm_address_t *saddr, u8 proto);
1544 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1545 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1546 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1547 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1548 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1549 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1550 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1551 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1552 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1553 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1554 int xfrm6_output(struct sock *sk, struct sk_buff *skb);
1555 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1556 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1557 u8 **prevhdr);
1558
1559 #ifdef CONFIG_XFRM
1560 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1561 int xfrm_user_policy(struct sock *sk, int optname,
1562 u8 __user *optval, int optlen);
1563 #else
1564 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1565 {
1566 return -ENOPROTOOPT;
1567 }
1568
1569 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1570 {
1571 /* should not happen */
1572 kfree_skb(skb);
1573 return 0;
1574 }
1575 #endif
1576
1577 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1578
1579 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1580 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1581 int (*func)(struct xfrm_policy *, int, int, void*),
1582 void *);
1583 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1584 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1585 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1586 u8 type, int dir,
1587 struct xfrm_selector *sel,
1588 struct xfrm_sec_ctx *ctx, int delete,
1589 int *err);
1590 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1591 u32 id, int delete, int *err);
1592 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1593 void xfrm_policy_hash_rebuild(struct net *net);
1594 u32 xfrm_get_acqseq(void);
1595 int verify_spi_info(u8 proto, u32 min, u32 max);
1596 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1597 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1598 u8 mode, u32 reqid, u8 proto,
1599 const xfrm_address_t *daddr,
1600 const xfrm_address_t *saddr, int create,
1601 unsigned short family);
1602 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1603
1604 #ifdef CONFIG_XFRM_MIGRATE
1605 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1606 const struct xfrm_migrate *m, int num_bundles,
1607 const struct xfrm_kmaddress *k);
1608 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1609 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1610 struct xfrm_migrate *m);
1611 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1612 struct xfrm_migrate *m, int num_bundles,
1613 struct xfrm_kmaddress *k, struct net *net);
1614 #endif
1615
1616 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1617 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1618 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1619 xfrm_address_t *addr);
1620
1621 void xfrm_input_init(void);
1622 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1623
1624 void xfrm_probe_algs(void);
1625 int xfrm_count_pfkey_auth_supported(void);
1626 int xfrm_count_pfkey_enc_supported(void);
1627 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1628 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1629 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1630 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1631 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1632 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1633 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1634 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1635 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1636 int probe);
1637
1638 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1639 const xfrm_address_t *b)
1640 {
1641 return ipv6_addr_equal((const struct in6_addr *)a,
1642 (const struct in6_addr *)b);
1643 }
1644
1645 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1646 const xfrm_address_t *b,
1647 sa_family_t family)
1648 {
1649 switch (family) {
1650 default:
1651 case AF_INET:
1652 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1653 case AF_INET6:
1654 return xfrm6_addr_equal(a, b);
1655 }
1656 }
1657
1658 static inline int xfrm_policy_id2dir(u32 index)
1659 {
1660 return index & 7;
1661 }
1662
1663 #ifdef CONFIG_XFRM
1664 static inline int xfrm_aevent_is_on(struct net *net)
1665 {
1666 struct sock *nlsk;
1667 int ret = 0;
1668
1669 rcu_read_lock();
1670 nlsk = rcu_dereference(net->xfrm.nlsk);
1671 if (nlsk)
1672 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1673 rcu_read_unlock();
1674 return ret;
1675 }
1676
1677 static inline int xfrm_acquire_is_on(struct net *net)
1678 {
1679 struct sock *nlsk;
1680 int ret = 0;
1681
1682 rcu_read_lock();
1683 nlsk = rcu_dereference(net->xfrm.nlsk);
1684 if (nlsk)
1685 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1686 rcu_read_unlock();
1687
1688 return ret;
1689 }
1690 #endif
1691
1692 static inline int aead_len(struct xfrm_algo_aead *alg)
1693 {
1694 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1695 }
1696
1697 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1698 {
1699 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1700 }
1701
1702 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1703 {
1704 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1705 }
1706
1707 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1708 {
1709 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1710 }
1711
1712 #ifdef CONFIG_XFRM_MIGRATE
1713 static inline int xfrm_replay_clone(struct xfrm_state *x,
1714 struct xfrm_state *orig)
1715 {
1716 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1717 GFP_KERNEL);
1718 if (!x->replay_esn)
1719 return -ENOMEM;
1720
1721 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1722 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1723
1724 x->preplay_esn = kmemdup(x->replay_esn,
1725 xfrm_replay_state_esn_len(x->replay_esn),
1726 GFP_KERNEL);
1727 if (!x->preplay_esn) {
1728 kfree(x->replay_esn);
1729 return -ENOMEM;
1730 }
1731
1732 return 0;
1733 }
1734
1735 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1736 {
1737 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1738 }
1739
1740
1741 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1742 {
1743 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1744 }
1745
1746 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1747 {
1748 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1749 }
1750
1751 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1752 {
1753 int i;
1754 for (i = 0; i < n; i++)
1755 xfrm_state_put(*(states + i));
1756 }
1757
1758 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1759 {
1760 int i;
1761 for (i = 0; i < n; i++)
1762 xfrm_state_delete(*(states + i));
1763 }
1764 #endif
1765
1766 #ifdef CONFIG_XFRM
1767 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1768 {
1769 return skb->sp->xvec[skb->sp->len - 1];
1770 }
1771 #endif
1772
1773 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1774 {
1775 if (attrs[XFRMA_MARK])
1776 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1777 else
1778 m->v = m->m = 0;
1779
1780 return m->v & m->m;
1781 }
1782
1783 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1784 {
1785 int ret = 0;
1786
1787 if (m->m | m->v)
1788 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1789 return ret;
1790 }
1791
1792 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1793 unsigned int family)
1794 {
1795 bool tunnel = false;
1796
1797 switch(family) {
1798 case AF_INET:
1799 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1800 tunnel = true;
1801 break;
1802 case AF_INET6:
1803 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1804 tunnel = true;
1805 break;
1806 }
1807 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1808 return -EINVAL;
1809
1810 return 0;
1811 }
1812 #endif /* _NET_XFRM_H */
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