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ipv6 route: use err pointers instead of returning pointer by reference
[linux/fpc-iii.git] / include / net / xfrm.h
blob4a9c21f9b4ea189075901a3f2c8c12ec6814f5fe
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,
289 int tos, int oif,
290 const xfrm_address_t *saddr,
291 const xfrm_address_t *daddr);
292 int (*get_saddr)(struct net *net, int oif,
293 xfrm_address_t *saddr,
294 xfrm_address_t *daddr);
295 void (*decode_session)(struct sk_buff *skb,
296 struct flowi *fl,
297 int reverse);
298 int (*get_tos)(const struct flowi *fl);
299 int (*init_path)(struct xfrm_dst *path,
300 struct dst_entry *dst,
301 int nfheader_len);
302 int (*fill_dst)(struct xfrm_dst *xdst,
303 struct net_device *dev,
304 const struct flowi *fl);
305 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig);
306 };
307
308 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
309 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
310 void km_policy_notify(struct xfrm_policy *xp, int dir,
311 const struct km_event *c);
312 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
313
314 struct xfrm_tmpl;
315 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
316 struct xfrm_policy *pol);
317 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
318 int __xfrm_state_delete(struct xfrm_state *x);
319
320 struct xfrm_state_afinfo {
321 unsigned int family;
322 unsigned int proto;
323 __be16 eth_proto;
324 struct module *owner;
325 const struct xfrm_type *type_map[IPPROTO_MAX];
326 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
327 int (*init_flags)(struct xfrm_state *x);
328 void (*init_tempsel)(struct xfrm_selector *sel,
329 const struct flowi *fl);
330 void (*init_temprop)(struct xfrm_state *x,
331 const struct xfrm_tmpl *tmpl,
332 const xfrm_address_t *daddr,
333 const xfrm_address_t *saddr);
334 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
335 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
336 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
337 int (*output_finish)(struct sock *sk, struct sk_buff *skb);
338 int (*extract_input)(struct xfrm_state *x,
339 struct sk_buff *skb);
340 int (*extract_output)(struct xfrm_state *x,
341 struct sk_buff *skb);
342 int (*transport_finish)(struct sk_buff *skb,
343 int async);
344 void (*local_error)(struct sk_buff *skb, u32 mtu);
345 };
346
347 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
348 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
349 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
350 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
351
352 struct xfrm_input_afinfo {
353 unsigned int family;
354 struct module *owner;
355 int (*callback)(struct sk_buff *skb, u8 protocol,
356 int err);
357 };
358
359 int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo);
360 int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo);
361
362 void xfrm_state_delete_tunnel(struct xfrm_state *x);
363
364 struct xfrm_type {
365 char *description;
366 struct module *owner;
367 u8 proto;
368 u8 flags;
369 #define XFRM_TYPE_NON_FRAGMENT 1
370 #define XFRM_TYPE_REPLAY_PROT 2
371 #define XFRM_TYPE_LOCAL_COADDR 4
372 #define XFRM_TYPE_REMOTE_COADDR 8
373
374 int (*init_state)(struct xfrm_state *x);
375 void (*destructor)(struct xfrm_state *);
376 int (*input)(struct xfrm_state *, struct sk_buff *skb);
377 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
378 int (*reject)(struct xfrm_state *, struct sk_buff *,
379 const struct flowi *);
380 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
381 /* Estimate maximal size of result of transformation of a dgram */
382 u32 (*get_mtu)(struct xfrm_state *, int size);
383 };
384
385 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
386 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
387
388 struct xfrm_mode {
389 /*
390 * Remove encapsulation header.
391 *
392 * The IP header will be moved over the top of the encapsulation
393 * header.
394 *
395 * On entry, the transport header shall point to where the IP header
396 * should be and the network header shall be set to where the IP
397 * header currently is. skb->data shall point to the start of the
398 * payload.
399 */
400 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
401
402 /*
403 * This is the actual input entry point.
404 *
405 * For transport mode and equivalent this would be identical to
406 * input2 (which does not need to be set). While tunnel mode
407 * and equivalent would set this to the tunnel encapsulation function
408 * xfrm4_prepare_input that would in turn call input2.
409 */
410 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
411
412 /*
413 * Add encapsulation header.
414 *
415 * On exit, the transport header will be set to the start of the
416 * encapsulation header to be filled in by x->type->output and
417 * the mac header will be set to the nextheader (protocol for
418 * IPv4) field of the extension header directly preceding the
419 * encapsulation header, or in its absence, that of the top IP
420 * header. The value of the network header will always point
421 * to the top IP header while skb->data will point to the payload.
422 */
423 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
424
425 /*
426 * This is the actual output entry point.
427 *
428 * For transport mode and equivalent this would be identical to
429 * output2 (which does not need to be set). While tunnel mode
430 * and equivalent would set this to a tunnel encapsulation function
431 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
432 * call output2.
433 */
434 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
435
436 struct xfrm_state_afinfo *afinfo;
437 struct module *owner;
438 unsigned int encap;
439 int flags;
440 };
441
442 /* Flags for xfrm_mode. */
443 enum {
444 XFRM_MODE_FLAG_TUNNEL = 1,
445 };
446
447 int xfrm_register_mode(struct xfrm_mode *mode, int family);
448 int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
449
450 static inline int xfrm_af2proto(unsigned int family)
451 {
452 switch(family) {
453 case AF_INET:
454 return IPPROTO_IPIP;
455 case AF_INET6:
456 return IPPROTO_IPV6;
457 default:
458 return 0;
459 }
460 }
461
462 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
463 {
464 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
465 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
466 return x->inner_mode;
467 else
468 return x->inner_mode_iaf;
469 }
470
471 struct xfrm_tmpl {
472 /* id in template is interpreted as:
473 * daddr - destination of tunnel, may be zero for transport mode.
474 * spi - zero to acquire spi. Not zero if spi is static, then
475 * daddr must be fixed too.
476 * proto - AH/ESP/IPCOMP
477 */
478 struct xfrm_id id;
479
480 /* Source address of tunnel. Ignored, if it is not a tunnel. */
481 xfrm_address_t saddr;
482
483 unsigned short encap_family;
484
485 u32 reqid;
486
487 /* Mode: transport, tunnel etc. */
488 u8 mode;
489
490 /* Sharing mode: unique, this session only, this user only etc. */
491 u8 share;
492
493 /* May skip this transfomration if no SA is found */
494 u8 optional;
495
496 /* Skip aalgos/ealgos/calgos checks. */
497 u8 allalgs;
498
499 /* Bit mask of algos allowed for acquisition */
500 u32 aalgos;
501 u32 ealgos;
502 u32 calgos;
503 };
504
505 #define XFRM_MAX_DEPTH 6
506
507 struct xfrm_policy_walk_entry {
508 struct list_head all;
509 u8 dead;
510 };
511
512 struct xfrm_policy_walk {
513 struct xfrm_policy_walk_entry walk;
514 u8 type;
515 u32 seq;
516 };
517
518 struct xfrm_policy_queue {
519 struct sk_buff_head hold_queue;
520 struct timer_list hold_timer;
521 unsigned long timeout;
522 };
523
524 struct xfrm_policy {
525 possible_net_t xp_net;
526 struct hlist_node bydst;
527 struct hlist_node byidx;
528
529 /* This lock only affects elements except for entry. */
530 rwlock_t lock;
531 atomic_t refcnt;
532 struct timer_list timer;
533
534 struct flow_cache_object flo;
535 atomic_t genid;
536 u32 priority;
537 u32 index;
538 struct xfrm_mark mark;
539 struct xfrm_selector selector;
540 struct xfrm_lifetime_cfg lft;
541 struct xfrm_lifetime_cur curlft;
542 struct xfrm_policy_walk_entry walk;
543 struct xfrm_policy_queue polq;
544 u8 type;
545 u8 action;
546 u8 flags;
547 u8 xfrm_nr;
548 u16 family;
549 struct xfrm_sec_ctx *security;
550 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
551 };
552
553 static inline struct net *xp_net(const struct xfrm_policy *xp)
554 {
555 return read_pnet(&xp->xp_net);
556 }
557
558 struct xfrm_kmaddress {
559 xfrm_address_t local;
560 xfrm_address_t remote;
561 u32 reserved;
562 u16 family;
563 };
564
565 struct xfrm_migrate {
566 xfrm_address_t old_daddr;
567 xfrm_address_t old_saddr;
568 xfrm_address_t new_daddr;
569 xfrm_address_t new_saddr;
570 u8 proto;
571 u8 mode;
572 u16 reserved;
573 u32 reqid;
574 u16 old_family;
575 u16 new_family;
576 };
577
578 #define XFRM_KM_TIMEOUT 30
579 /* what happened */
580 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
581 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
582
583 /* default aevent timeout in units of 100ms */
584 #define XFRM_AE_ETIME 10
585 /* Async Event timer multiplier */
586 #define XFRM_AE_ETH_M 10
587 /* default seq threshold size */
588 #define XFRM_AE_SEQT_SIZE 2
589
590 struct xfrm_mgr {
591 struct list_head list;
592 char *id;
593 int (*notify)(struct xfrm_state *x, const struct km_event *c);
594 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
595 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
596 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
597 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
598 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
599 int (*migrate)(const struct xfrm_selector *sel,
600 u8 dir, u8 type,
601 const struct xfrm_migrate *m,
602 int num_bundles,
603 const struct xfrm_kmaddress *k);
604 bool (*is_alive)(const struct km_event *c);
605 };
606
607 int xfrm_register_km(struct xfrm_mgr *km);
608 int xfrm_unregister_km(struct xfrm_mgr *km);
609
610 struct xfrm_tunnel_skb_cb {
611 union {
612 struct inet_skb_parm h4;
613 struct inet6_skb_parm h6;
614 } header;
615
616 union {
617 struct ip_tunnel *ip4;
618 struct ip6_tnl *ip6;
619 } tunnel;
620 };
621
622 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
623
624 /*
625 * This structure is used for the duration where packets are being
626 * transformed by IPsec. As soon as the packet leaves IPsec the
627 * area beyond the generic IP part may be overwritten.
628 */
629 struct xfrm_skb_cb {
630 struct xfrm_tunnel_skb_cb header;
631
632 /* Sequence number for replay protection. */
633 union {
634 struct {
635 __u32 low;
636 __u32 hi;
637 } output;
638 struct {
639 __be32 low;
640 __be32 hi;
641 } input;
642 } seq;
643 };
644
645 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
646
647 /*
648 * This structure is used by the afinfo prepare_input/prepare_output functions
649 * to transmit header information to the mode input/output functions.
650 */
651 struct xfrm_mode_skb_cb {
652 struct xfrm_tunnel_skb_cb header;
653
654 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
655 __be16 id;
656 __be16 frag_off;
657
658 /* IP header length (excluding options or extension headers). */
659 u8 ihl;
660
661 /* TOS for IPv4, class for IPv6. */
662 u8 tos;
663
664 /* TTL for IPv4, hop limitfor IPv6. */
665 u8 ttl;
666
667 /* Protocol for IPv4, NH for IPv6. */
668 u8 protocol;
669
670 /* Option length for IPv4, zero for IPv6. */
671 u8 optlen;
672
673 /* Used by IPv6 only, zero for IPv4. */
674 u8 flow_lbl[3];
675 };
676
677 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
678
679 /*
680 * This structure is used by the input processing to locate the SPI and
681 * related information.
682 */
683 struct xfrm_spi_skb_cb {
684 struct xfrm_tunnel_skb_cb header;
685
686 unsigned int daddroff;
687 unsigned int family;
688 };
689
690 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
691
692 #ifdef CONFIG_AUDITSYSCALL
693 static inline struct audit_buffer *xfrm_audit_start(const char *op)
694 {
695 struct audit_buffer *audit_buf = NULL;
696
697 if (audit_enabled == 0)
698 return NULL;
699 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
700 AUDIT_MAC_IPSEC_EVENT);
701 if (audit_buf == NULL)
702 return NULL;
703 audit_log_format(audit_buf, "op=%s", op);
704 return audit_buf;
705 }
706
707 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
708 struct audit_buffer *audit_buf)
709 {
710 const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
711 audit_get_loginuid(current) :
712 INVALID_UID);
713 const unsigned int ses = task_valid ? audit_get_sessionid(current) :
714 (unsigned int) -1;
715
716 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
717 audit_log_task_context(audit_buf);
718 }
719
720 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
721 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
722 bool task_valid);
723 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
724 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
725 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
726 struct sk_buff *skb);
727 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
728 __be32 net_seq);
729 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
730 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
731 __be32 net_seq);
732 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
733 u8 proto);
734 #else
735
736 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
737 bool task_valid)
738 {
739 }
740
741 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
742 bool task_valid)
743 {
744 }
745
746 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
747 bool task_valid)
748 {
749 }
750
751 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
752 bool task_valid)
753 {
754 }
755
756 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
757 struct sk_buff *skb)
758 {
759 }
760
761 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
762 struct sk_buff *skb, __be32 net_seq)
763 {
764 }
765
766 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
767 u16 family)
768 {
769 }
770
771 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
772 __be32 net_spi, __be32 net_seq)
773 {
774 }
775
776 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
777 struct sk_buff *skb, u8 proto)
778 {
779 }
780 #endif /* CONFIG_AUDITSYSCALL */
781
782 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
783 {
784 if (likely(policy != NULL))
785 atomic_inc(&policy->refcnt);
786 }
787
788 void xfrm_policy_destroy(struct xfrm_policy *policy);
789
790 static inline void xfrm_pol_put(struct xfrm_policy *policy)
791 {
792 if (atomic_dec_and_test(&policy->refcnt))
793 xfrm_policy_destroy(policy);
794 }
795
796 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
797 {
798 int i;
799 for (i = npols - 1; i >= 0; --i)
800 xfrm_pol_put(pols[i]);
801 }
802
803 void __xfrm_state_destroy(struct xfrm_state *);
804
805 static inline void __xfrm_state_put(struct xfrm_state *x)
806 {
807 atomic_dec(&x->refcnt);
808 }
809
810 static inline void xfrm_state_put(struct xfrm_state *x)
811 {
812 if (atomic_dec_and_test(&x->refcnt))
813 __xfrm_state_destroy(x);
814 }
815
816 static inline void xfrm_state_hold(struct xfrm_state *x)
817 {
818 atomic_inc(&x->refcnt);
819 }
820
821 static inline bool addr_match(const void *token1, const void *token2,
822 int prefixlen)
823 {
824 const __be32 *a1 = token1;
825 const __be32 *a2 = token2;
826 int pdw;
827 int pbi;
828
829 pdw = prefixlen >> 5; /* num of whole u32 in prefix */
830 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
831
832 if (pdw)
833 if (memcmp(a1, a2, pdw << 2))
834 return false;
835
836 if (pbi) {
837 __be32 mask;
838
839 mask = htonl((0xffffffff) << (32 - pbi));
840
841 if ((a1[pdw] ^ a2[pdw]) & mask)
842 return false;
843 }
844
845 return true;
846 }
847
848 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
849 {
850 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
851 if (prefixlen == 0)
852 return true;
853 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
854 }
855
856 static __inline__
857 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
858 {
859 __be16 port;
860 switch(fl->flowi_proto) {
861 case IPPROTO_TCP:
862 case IPPROTO_UDP:
863 case IPPROTO_UDPLITE:
864 case IPPROTO_SCTP:
865 port = uli->ports.sport;
866 break;
867 case IPPROTO_ICMP:
868 case IPPROTO_ICMPV6:
869 port = htons(uli->icmpt.type);
870 break;
871 case IPPROTO_MH:
872 port = htons(uli->mht.type);
873 break;
874 case IPPROTO_GRE:
875 port = htons(ntohl(uli->gre_key) >> 16);
876 break;
877 default:
878 port = 0; /*XXX*/
879 }
880 return port;
881 }
882
883 static __inline__
884 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
885 {
886 __be16 port;
887 switch(fl->flowi_proto) {
888 case IPPROTO_TCP:
889 case IPPROTO_UDP:
890 case IPPROTO_UDPLITE:
891 case IPPROTO_SCTP:
892 port = uli->ports.dport;
893 break;
894 case IPPROTO_ICMP:
895 case IPPROTO_ICMPV6:
896 port = htons(uli->icmpt.code);
897 break;
898 case IPPROTO_GRE:
899 port = htons(ntohl(uli->gre_key) & 0xffff);
900 break;
901 default:
902 port = 0; /*XXX*/
903 }
904 return port;
905 }
906
907 bool xfrm_selector_match(const struct xfrm_selector *sel,
908 const struct flowi *fl, unsigned short family);
909
910 #ifdef CONFIG_SECURITY_NETWORK_XFRM
911 /* If neither has a context --> match
912 * Otherwise, both must have a context and the sids, doi, alg must match
913 */
914 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
915 {
916 return ((!s1 && !s2) ||
917 (s1 && s2 &&
918 (s1->ctx_sid == s2->ctx_sid) &&
919 (s1->ctx_doi == s2->ctx_doi) &&
920 (s1->ctx_alg == s2->ctx_alg)));
921 }
922 #else
923 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
924 {
925 return true;
926 }
927 #endif
928
929 /* A struct encoding bundle of transformations to apply to some set of flow.
930 *
931 * dst->child points to the next element of bundle.
932 * dst->xfrm points to an instanse of transformer.
933 *
934 * Due to unfortunate limitations of current routing cache, which we
935 * have no time to fix, it mirrors struct rtable and bound to the same
936 * routing key, including saddr,daddr. However, we can have many of
937 * bundles differing by session id. All the bundles grow from a parent
938 * policy rule.
939 */
940 struct xfrm_dst {
941 union {
942 struct dst_entry dst;
943 struct rtable rt;
944 struct rt6_info rt6;
945 } u;
946 struct dst_entry *route;
947 struct flow_cache_object flo;
948 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
949 int num_pols, num_xfrms;
950 #ifdef CONFIG_XFRM_SUB_POLICY
951 struct flowi *origin;
952 struct xfrm_selector *partner;
953 #endif
954 u32 xfrm_genid;
955 u32 policy_genid;
956 u32 route_mtu_cached;
957 u32 child_mtu_cached;
958 u32 route_cookie;
959 u32 path_cookie;
960 };
961
962 #ifdef CONFIG_XFRM
963 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
964 {
965 xfrm_pols_put(xdst->pols, xdst->num_pols);
966 dst_release(xdst->route);
967 if (likely(xdst->u.dst.xfrm))
968 xfrm_state_put(xdst->u.dst.xfrm);
969 #ifdef CONFIG_XFRM_SUB_POLICY
970 kfree(xdst->origin);
971 xdst->origin = NULL;
972 kfree(xdst->partner);
973 xdst->partner = NULL;
974 #endif
975 }
976 #endif
977
978 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
979
980 struct sec_path {
981 atomic_t refcnt;
982 int len;
983 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
984 };
985
986 static inline int secpath_exists(struct sk_buff *skb)
987 {
988 #ifdef CONFIG_XFRM
989 return skb->sp != NULL;
990 #else
991 return 0;
992 #endif
993 }
994
995 static inline struct sec_path *
996 secpath_get(struct sec_path *sp)
997 {
998 if (sp)
999 atomic_inc(&sp->refcnt);
1000 return sp;
1001 }
1002
1003 void __secpath_destroy(struct sec_path *sp);
1004
1005 static inline void
1006 secpath_put(struct sec_path *sp)
1007 {
1008 if (sp && atomic_dec_and_test(&sp->refcnt))
1009 __secpath_destroy(sp);
1010 }
1011
1012 struct sec_path *secpath_dup(struct sec_path *src);
1013
1014 static inline void
1015 secpath_reset(struct sk_buff *skb)
1016 {
1017 #ifdef CONFIG_XFRM
1018 secpath_put(skb->sp);
1019 skb->sp = NULL;
1020 #endif
1021 }
1022
1023 static inline int
1024 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1025 {
1026 switch (family) {
1027 case AF_INET:
1028 return addr->a4 == 0;
1029 case AF_INET6:
1030 return ipv6_addr_any(&addr->in6);
1031 }
1032 return 0;
1033 }
1034
1035 static inline int
1036 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1037 {
1038 return (tmpl->saddr.a4 &&
1039 tmpl->saddr.a4 != x->props.saddr.a4);
1040 }
1041
1042 static inline int
1043 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1044 {
1045 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1046 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1047 }
1048
1049 static inline int
1050 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1051 {
1052 switch (family) {
1053 case AF_INET:
1054 return __xfrm4_state_addr_cmp(tmpl, x);
1055 case AF_INET6:
1056 return __xfrm6_state_addr_cmp(tmpl, x);
1057 }
1058 return !0;
1059 }
1060
1061 #ifdef CONFIG_XFRM
1062 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1063 unsigned short family);
1064
1065 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1066 struct sk_buff *skb,
1067 unsigned int family, int reverse)
1068 {
1069 struct net *net = dev_net(skb->dev);
1070 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1071
1072 if (sk && sk->sk_policy[XFRM_POLICY_IN])
1073 return __xfrm_policy_check(sk, ndir, skb, family);
1074
1075 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
1076 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1077 __xfrm_policy_check(sk, ndir, skb, family);
1078 }
1079
1080 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1081 {
1082 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1083 }
1084
1085 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1086 {
1087 return xfrm_policy_check(sk, dir, skb, AF_INET);
1088 }
1089
1090 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1091 {
1092 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1093 }
1094
1095 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1096 struct sk_buff *skb)
1097 {
1098 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1099 }
1100
1101 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1102 struct sk_buff *skb)
1103 {
1104 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1105 }
1106
1107 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1108 unsigned int family, int reverse);
1109
1110 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1111 unsigned int family)
1112 {
1113 return __xfrm_decode_session(skb, fl, family, 0);
1114 }
1115
1116 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1117 struct flowi *fl,
1118 unsigned int family)
1119 {
1120 return __xfrm_decode_session(skb, fl, family, 1);
1121 }
1122
1123 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1124
1125 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1126 {
1127 struct net *net = dev_net(skb->dev);
1128
1129 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1130 (skb_dst(skb)->flags & DST_NOXFRM) ||
1131 __xfrm_route_forward(skb, family);
1132 }
1133
1134 static inline int xfrm4_route_forward(struct sk_buff *skb)
1135 {
1136 return xfrm_route_forward(skb, AF_INET);
1137 }
1138
1139 static inline int xfrm6_route_forward(struct sk_buff *skb)
1140 {
1141 return xfrm_route_forward(skb, AF_INET6);
1142 }
1143
1144 int __xfrm_sk_clone_policy(struct sock *sk);
1145
1146 static inline int xfrm_sk_clone_policy(struct sock *sk)
1147 {
1148 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1149 return __xfrm_sk_clone_policy(sk);
1150 return 0;
1151 }
1152
1153 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1154
1155 static inline void xfrm_sk_free_policy(struct sock *sk)
1156 {
1157 if (unlikely(sk->sk_policy[0] != NULL)) {
1158 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1159 sk->sk_policy[0] = NULL;
1160 }
1161 if (unlikely(sk->sk_policy[1] != NULL)) {
1162 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1163 sk->sk_policy[1] = NULL;
1164 }
1165 }
1166
1167 void xfrm_garbage_collect(struct net *net);
1168
1169 #else
1170
1171 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1172 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1173 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1174 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1175 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1176 {
1177 return 1;
1178 }
1179 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1180 {
1181 return 1;
1182 }
1183 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1184 {
1185 return 1;
1186 }
1187 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1188 struct flowi *fl,
1189 unsigned int family)
1190 {
1191 return -ENOSYS;
1192 }
1193 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1194 struct sk_buff *skb)
1195 {
1196 return 1;
1197 }
1198 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1199 struct sk_buff *skb)
1200 {
1201 return 1;
1202 }
1203 static inline void xfrm_garbage_collect(struct net *net)
1204 {
1205 }
1206 #endif
1207
1208 static __inline__
1209 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1210 {
1211 switch (family){
1212 case AF_INET:
1213 return (xfrm_address_t *)&fl->u.ip4.daddr;
1214 case AF_INET6:
1215 return (xfrm_address_t *)&fl->u.ip6.daddr;
1216 }
1217 return NULL;
1218 }
1219
1220 static __inline__
1221 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1222 {
1223 switch (family){
1224 case AF_INET:
1225 return (xfrm_address_t *)&fl->u.ip4.saddr;
1226 case AF_INET6:
1227 return (xfrm_address_t *)&fl->u.ip6.saddr;
1228 }
1229 return NULL;
1230 }
1231
1232 static __inline__
1233 void xfrm_flowi_addr_get(const struct flowi *fl,
1234 xfrm_address_t *saddr, xfrm_address_t *daddr,
1235 unsigned short family)
1236 {
1237 switch(family) {
1238 case AF_INET:
1239 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1240 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1241 break;
1242 case AF_INET6:
1243 saddr->in6 = fl->u.ip6.saddr;
1244 daddr->in6 = fl->u.ip6.daddr;
1245 break;
1246 }
1247 }
1248
1249 static __inline__ int
1250 __xfrm4_state_addr_check(const struct xfrm_state *x,
1251 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1252 {
1253 if (daddr->a4 == x->id.daddr.a4 &&
1254 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1255 return 1;
1256 return 0;
1257 }
1258
1259 static __inline__ int
1260 __xfrm6_state_addr_check(const struct xfrm_state *x,
1261 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1262 {
1263 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1264 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1265 ipv6_addr_any((struct in6_addr *)saddr) ||
1266 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1267 return 1;
1268 return 0;
1269 }
1270
1271 static __inline__ int
1272 xfrm_state_addr_check(const struct xfrm_state *x,
1273 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1274 unsigned short family)
1275 {
1276 switch (family) {
1277 case AF_INET:
1278 return __xfrm4_state_addr_check(x, daddr, saddr);
1279 case AF_INET6:
1280 return __xfrm6_state_addr_check(x, daddr, saddr);
1281 }
1282 return 0;
1283 }
1284
1285 static __inline__ int
1286 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1287 unsigned short family)
1288 {
1289 switch (family) {
1290 case AF_INET:
1291 return __xfrm4_state_addr_check(x,
1292 (const xfrm_address_t *)&fl->u.ip4.daddr,
1293 (const xfrm_address_t *)&fl->u.ip4.saddr);
1294 case AF_INET6:
1295 return __xfrm6_state_addr_check(x,
1296 (const xfrm_address_t *)&fl->u.ip6.daddr,
1297 (const xfrm_address_t *)&fl->u.ip6.saddr);
1298 }
1299 return 0;
1300 }
1301
1302 static inline int xfrm_state_kern(const struct xfrm_state *x)
1303 {
1304 return atomic_read(&x->tunnel_users);
1305 }
1306
1307 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1308 {
1309 return (!userproto || proto == userproto ||
1310 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1311 proto == IPPROTO_ESP ||
1312 proto == IPPROTO_COMP)));
1313 }
1314
1315 /*
1316 * xfrm algorithm information
1317 */
1318 struct xfrm_algo_aead_info {
1319 char *geniv;
1320 u16 icv_truncbits;
1321 };
1322
1323 struct xfrm_algo_auth_info {
1324 u16 icv_truncbits;
1325 u16 icv_fullbits;
1326 };
1327
1328 struct xfrm_algo_encr_info {
1329 char *geniv;
1330 u16 blockbits;
1331 u16 defkeybits;
1332 };
1333
1334 struct xfrm_algo_comp_info {
1335 u16 threshold;
1336 };
1337
1338 struct xfrm_algo_desc {
1339 char *name;
1340 char *compat;
1341 u8 available:1;
1342 u8 pfkey_supported:1;
1343 union {
1344 struct xfrm_algo_aead_info aead;
1345 struct xfrm_algo_auth_info auth;
1346 struct xfrm_algo_encr_info encr;
1347 struct xfrm_algo_comp_info comp;
1348 } uinfo;
1349 struct sadb_alg desc;
1350 };
1351
1352 /* XFRM protocol handlers. */
1353 struct xfrm4_protocol {
1354 int (*handler)(struct sk_buff *skb);
1355 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1356 int encap_type);
1357 int (*cb_handler)(struct sk_buff *skb, int err);
1358 int (*err_handler)(struct sk_buff *skb, u32 info);
1359
1360 struct xfrm4_protocol __rcu *next;
1361 int priority;
1362 };
1363
1364 struct xfrm6_protocol {
1365 int (*handler)(struct sk_buff *skb);
1366 int (*cb_handler)(struct sk_buff *skb, int err);
1367 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1368 u8 type, u8 code, int offset, __be32 info);
1369
1370 struct xfrm6_protocol __rcu *next;
1371 int priority;
1372 };
1373
1374 /* XFRM tunnel handlers. */
1375 struct xfrm_tunnel {
1376 int (*handler)(struct sk_buff *skb);
1377 int (*err_handler)(struct sk_buff *skb, u32 info);
1378
1379 struct xfrm_tunnel __rcu *next;
1380 int priority;
1381 };
1382
1383 struct xfrm6_tunnel {
1384 int (*handler)(struct sk_buff *skb);
1385 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1386 u8 type, u8 code, int offset, __be32 info);
1387 struct xfrm6_tunnel __rcu *next;
1388 int priority;
1389 };
1390
1391 void xfrm_init(void);
1392 void xfrm4_init(void);
1393 int xfrm_state_init(struct net *net);
1394 void xfrm_state_fini(struct net *net);
1395 void xfrm4_state_init(void);
1396 void xfrm4_protocol_init(void);
1397 #ifdef CONFIG_XFRM
1398 int xfrm6_init(void);
1399 void xfrm6_fini(void);
1400 int xfrm6_state_init(void);
1401 void xfrm6_state_fini(void);
1402 int xfrm6_protocol_init(void);
1403 void xfrm6_protocol_fini(void);
1404 #else
1405 static inline int xfrm6_init(void)
1406 {
1407 return 0;
1408 }
1409 static inline void xfrm6_fini(void)
1410 {
1411 ;
1412 }
1413 #endif
1414
1415 #ifdef CONFIG_XFRM_STATISTICS
1416 int xfrm_proc_init(struct net *net);
1417 void xfrm_proc_fini(struct net *net);
1418 #endif
1419
1420 int xfrm_sysctl_init(struct net *net);
1421 #ifdef CONFIG_SYSCTL
1422 void xfrm_sysctl_fini(struct net *net);
1423 #else
1424 static inline void xfrm_sysctl_fini(struct net *net)
1425 {
1426 }
1427 #endif
1428
1429 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1430 struct xfrm_address_filter *filter);
1431 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1432 int (*func)(struct xfrm_state *, int, void*), void *);
1433 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1434 struct xfrm_state *xfrm_state_alloc(struct net *net);
1435 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1436 const xfrm_address_t *saddr,
1437 const struct flowi *fl,
1438 struct xfrm_tmpl *tmpl,
1439 struct xfrm_policy *pol, int *err,
1440 unsigned short family);
1441 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1442 xfrm_address_t *daddr,
1443 xfrm_address_t *saddr,
1444 unsigned short family,
1445 u8 mode, u8 proto, u32 reqid);
1446 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1447 unsigned short family);
1448 int xfrm_state_check_expire(struct xfrm_state *x);
1449 void xfrm_state_insert(struct xfrm_state *x);
1450 int xfrm_state_add(struct xfrm_state *x);
1451 int xfrm_state_update(struct xfrm_state *x);
1452 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1453 const xfrm_address_t *daddr, __be32 spi,
1454 u8 proto, unsigned short family);
1455 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1456 const xfrm_address_t *daddr,
1457 const xfrm_address_t *saddr,
1458 u8 proto,
1459 unsigned short family);
1460 #ifdef CONFIG_XFRM_SUB_POLICY
1461 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1462 unsigned short family, struct net *net);
1463 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1464 unsigned short family);
1465 #else
1466 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1467 int n, unsigned short family, struct net *net)
1468 {
1469 return -ENOSYS;
1470 }
1471
1472 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1473 int n, unsigned short family)
1474 {
1475 return -ENOSYS;
1476 }
1477 #endif
1478
1479 struct xfrmk_sadinfo {
1480 u32 sadhcnt; /* current hash bkts */
1481 u32 sadhmcnt; /* max allowed hash bkts */
1482 u32 sadcnt; /* current running count */
1483 };
1484
1485 struct xfrmk_spdinfo {
1486 u32 incnt;
1487 u32 outcnt;
1488 u32 fwdcnt;
1489 u32 inscnt;
1490 u32 outscnt;
1491 u32 fwdscnt;
1492 u32 spdhcnt;
1493 u32 spdhmcnt;
1494 };
1495
1496 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1497 int xfrm_state_delete(struct xfrm_state *x);
1498 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1499 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1500 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1501 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1502 int xfrm_init_replay(struct xfrm_state *x);
1503 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1504 int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1505 int xfrm_init_state(struct xfrm_state *x);
1506 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1507 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1508 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1509 int xfrm_output_resume(struct sk_buff *skb, int err);
1510 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1511 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1512 void xfrm_local_error(struct sk_buff *skb, int mtu);
1513 int xfrm4_extract_header(struct sk_buff *skb);
1514 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1515 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1516 int encap_type);
1517 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1518 int xfrm4_rcv(struct sk_buff *skb);
1519
1520 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1521 {
1522 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1523 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1524 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1525 return xfrm_input(skb, nexthdr, spi, 0);
1526 }
1527
1528 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1529 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1530 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1531 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1532 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1533 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1534 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1535 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1536 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1537 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1538 int xfrm6_extract_header(struct sk_buff *skb);
1539 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1540 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1541 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1542 int xfrm6_rcv(struct sk_buff *skb);
1543 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1544 xfrm_address_t *saddr, u8 proto);
1545 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1546 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1547 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1548 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1549 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1550 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1551 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1552 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1553 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1554 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1555 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1556 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1557 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1558 u8 **prevhdr);
1559
1560 #ifdef CONFIG_XFRM
1561 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1562 int xfrm_user_policy(struct sock *sk, int optname,
1563 u8 __user *optval, int optlen);
1564 #else
1565 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1566 {
1567 return -ENOPROTOOPT;
1568 }
1569
1570 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1571 {
1572 /* should not happen */
1573 kfree_skb(skb);
1574 return 0;
1575 }
1576 #endif
1577
1578 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1579
1580 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1581 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1582 int (*func)(struct xfrm_policy *, int, int, void*),
1583 void *);
1584 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1585 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1586 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1587 u8 type, int dir,
1588 struct xfrm_selector *sel,
1589 struct xfrm_sec_ctx *ctx, int delete,
1590 int *err);
1591 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1592 u32 id, int delete, int *err);
1593 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1594 void xfrm_policy_hash_rebuild(struct net *net);
1595 u32 xfrm_get_acqseq(void);
1596 int verify_spi_info(u8 proto, u32 min, u32 max);
1597 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1598 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1599 u8 mode, u32 reqid, u8 proto,
1600 const xfrm_address_t *daddr,
1601 const xfrm_address_t *saddr, int create,
1602 unsigned short family);
1603 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1604
1605 #ifdef CONFIG_XFRM_MIGRATE
1606 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1607 const struct xfrm_migrate *m, int num_bundles,
1608 const struct xfrm_kmaddress *k);
1609 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1610 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1611 struct xfrm_migrate *m);
1612 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1613 struct xfrm_migrate *m, int num_bundles,
1614 struct xfrm_kmaddress *k, struct net *net);
1615 #endif
1616
1617 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1618 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1619 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1620 xfrm_address_t *addr);
1621
1622 void xfrm_input_init(void);
1623 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1624
1625 void xfrm_probe_algs(void);
1626 int xfrm_count_pfkey_auth_supported(void);
1627 int xfrm_count_pfkey_enc_supported(void);
1628 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1629 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1630 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1631 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1632 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1633 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1634 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1635 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1636 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1637 int probe);
1638
1639 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1640 const xfrm_address_t *b)
1641 {
1642 return ipv6_addr_equal((const struct in6_addr *)a,
1643 (const struct in6_addr *)b);
1644 }
1645
1646 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1647 const xfrm_address_t *b,
1648 sa_family_t family)
1649 {
1650 switch (family) {
1651 default:
1652 case AF_INET:
1653 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1654 case AF_INET6:
1655 return xfrm6_addr_equal(a, b);
1656 }
1657 }
1658
1659 static inline int xfrm_policy_id2dir(u32 index)
1660 {
1661 return index & 7;
1662 }
1663
1664 #ifdef CONFIG_XFRM
1665 static inline int xfrm_aevent_is_on(struct net *net)
1666 {
1667 struct sock *nlsk;
1668 int ret = 0;
1669
1670 rcu_read_lock();
1671 nlsk = rcu_dereference(net->xfrm.nlsk);
1672 if (nlsk)
1673 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1674 rcu_read_unlock();
1675 return ret;
1676 }
1677
1678 static inline int xfrm_acquire_is_on(struct net *net)
1679 {
1680 struct sock *nlsk;
1681 int ret = 0;
1682
1683 rcu_read_lock();
1684 nlsk = rcu_dereference(net->xfrm.nlsk);
1685 if (nlsk)
1686 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1687 rcu_read_unlock();
1688
1689 return ret;
1690 }
1691 #endif
1692
1693 static inline int aead_len(struct xfrm_algo_aead *alg)
1694 {
1695 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1696 }
1697
1698 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1699 {
1700 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1701 }
1702
1703 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1704 {
1705 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1706 }
1707
1708 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1709 {
1710 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1711 }
1712
1713 #ifdef CONFIG_XFRM_MIGRATE
1714 static inline int xfrm_replay_clone(struct xfrm_state *x,
1715 struct xfrm_state *orig)
1716 {
1717 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1718 GFP_KERNEL);
1719 if (!x->replay_esn)
1720 return -ENOMEM;
1721
1722 x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1723 x->replay_esn->replay_window = orig->replay_esn->replay_window;
1724
1725 x->preplay_esn = kmemdup(x->replay_esn,
1726 xfrm_replay_state_esn_len(x->replay_esn),
1727 GFP_KERNEL);
1728 if (!x->preplay_esn) {
1729 kfree(x->replay_esn);
1730 return -ENOMEM;
1731 }
1732
1733 return 0;
1734 }
1735
1736 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1737 {
1738 return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1739 }
1740
1741
1742 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1743 {
1744 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1745 }
1746
1747 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1748 {
1749 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1750 }
1751
1752 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1753 {
1754 int i;
1755 for (i = 0; i < n; i++)
1756 xfrm_state_put(*(states + i));
1757 }
1758
1759 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1760 {
1761 int i;
1762 for (i = 0; i < n; i++)
1763 xfrm_state_delete(*(states + i));
1764 }
1765 #endif
1766
1767 #ifdef CONFIG_XFRM
1768 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1769 {
1770 return skb->sp->xvec[skb->sp->len - 1];
1771 }
1772 #endif
1773
1774 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1775 {
1776 if (attrs[XFRMA_MARK])
1777 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1778 else
1779 m->v = m->m = 0;
1780
1781 return m->v & m->m;
1782 }
1783
1784 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1785 {
1786 int ret = 0;
1787
1788 if (m->m | m->v)
1789 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1790 return ret;
1791 }
1792
1793 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1794 unsigned int family)
1795 {
1796 bool tunnel = false;
1797
1798 switch(family) {
1799 case AF_INET:
1800 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1801 tunnel = true;
1802 break;
1803 case AF_INET6:
1804 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1805 tunnel = true;
1806 break;
1807 }
1808 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1809 return -EINVAL;
1810
1811 return 0;
1812 }
1813 #endif /* _NET_XFRM_H */
Linux with added FPC-III support